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Pull netlink into release branch
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / ieee80211.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <net/iw_handler.h>
24 #include <linux/compiler.h>
25 #include <linux/bitmap.h>
26 #include <net/cfg80211.h>
27 #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->sdata->use_protection && 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 && tx->sdata->use_protection &&
872 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
873 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
874
875 /* Setup duration field for the first fragment of the frame. Duration
876 * for remaining fragments will be updated when they are being sent
877 * to low-level driver in ieee80211_tx(). */
878 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
879 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
880 0);
881 hdr->duration_id = cpu_to_le16(dur);
882
883 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
884 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
885 struct ieee80211_rate *rate;
886
887 /* Do not use multiple retry rates when using RTS/CTS */
888 control->alt_retry_rate = -1;
889
890 /* Use min(data rate, max base rate) as CTS/RTS rate */
891 rate = tx->u.tx.rate;
892 while (rate > mode->rates &&
893 !(rate->flags & IEEE80211_RATE_BASIC))
894 rate--;
895
896 control->rts_cts_rate = rate->val;
897 control->rts_rate = rate;
898 }
899
900 if (tx->sta) {
901 tx->sta->tx_packets++;
902 tx->sta->tx_fragments++;
903 tx->sta->tx_bytes += tx->skb->len;
904 if (tx->u.tx.extra_frag) {
905 int i;
906 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
907 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
908 tx->sta->tx_bytes +=
909 tx->u.tx.extra_frag[i]->len;
910 }
911 }
912 }
913
914 return TXRX_CONTINUE;
915 }
916
917
918 static ieee80211_txrx_result
919 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
920 {
921 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
922 struct sk_buff *skb = tx->skb;
923 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
924 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
925 u32 sta_flags;
926
927 if (unlikely(tx->local->sta_scanning != 0) &&
928 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
929 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
930 return TXRX_DROP;
931
932 if (tx->u.tx.ps_buffered)
933 return TXRX_CONTINUE;
934
935 sta_flags = tx->sta ? tx->sta->flags : 0;
936
937 if (likely(tx->u.tx.unicast)) {
938 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
939 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
940 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
941 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
942 printk(KERN_DEBUG "%s: dropped data frame to not "
943 "associated station " MAC_FMT "\n",
944 tx->dev->name, MAC_ARG(hdr->addr1));
945 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
946 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
947 return TXRX_DROP;
948 }
949 } else {
950 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
951 tx->local->num_sta == 0 &&
952 !tx->local->allow_broadcast_always &&
953 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
954 /*
955 * No associated STAs - no need to send multicast
956 * frames.
957 */
958 return TXRX_DROP;
959 }
960 return TXRX_CONTINUE;
961 }
962
963 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
964 !(sta_flags & WLAN_STA_AUTHORIZED))) {
965 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
966 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
967 " (unauthorized port)\n", tx->dev->name,
968 MAC_ARG(hdr->addr1));
969 #endif
970 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
971 return TXRX_DROP;
972 }
973
974 return TXRX_CONTINUE;
975 }
976
977 static ieee80211_txrx_result
978 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
979 {
980 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
981
982 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
983 ieee80211_include_sequence(tx->sdata, hdr);
984
985 return TXRX_CONTINUE;
986 }
987
988 /* This function is called whenever the AP is about to exceed the maximum limit
989 * of buffered frames for power saving STAs. This situation should not really
990 * happen often during normal operation, so dropping the oldest buffered packet
991 * from each queue should be OK to make some room for new frames. */
992 static void purge_old_ps_buffers(struct ieee80211_local *local)
993 {
994 int total = 0, purged = 0;
995 struct sk_buff *skb;
996 struct ieee80211_sub_if_data *sdata;
997 struct sta_info *sta;
998
999 read_lock(&local->sub_if_lock);
1000 list_for_each_entry(sdata, &local->sub_if_list, list) {
1001 struct ieee80211_if_ap *ap;
1002 if (sdata->dev == local->mdev ||
1003 sdata->type != IEEE80211_IF_TYPE_AP)
1004 continue;
1005 ap = &sdata->u.ap;
1006 skb = skb_dequeue(&ap->ps_bc_buf);
1007 if (skb) {
1008 purged++;
1009 dev_kfree_skb(skb);
1010 }
1011 total += skb_queue_len(&ap->ps_bc_buf);
1012 }
1013 read_unlock(&local->sub_if_lock);
1014
1015 spin_lock_bh(&local->sta_lock);
1016 list_for_each_entry(sta, &local->sta_list, list) {
1017 skb = skb_dequeue(&sta->ps_tx_buf);
1018 if (skb) {
1019 purged++;
1020 dev_kfree_skb(skb);
1021 }
1022 total += skb_queue_len(&sta->ps_tx_buf);
1023 }
1024 spin_unlock_bh(&local->sta_lock);
1025
1026 local->total_ps_buffered = total;
1027 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
1028 local->mdev->name, purged);
1029 }
1030
1031
1032 static inline ieee80211_txrx_result
1033 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
1034 {
1035 /* broadcast/multicast frame */
1036 /* If any of the associated stations is in power save mode,
1037 * the frame is buffered to be sent after DTIM beacon frame */
1038 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
1039 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
1040 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
1041 !(tx->fc & IEEE80211_FCTL_ORDER)) {
1042 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1043 purge_old_ps_buffers(tx->local);
1044 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
1045 AP_MAX_BC_BUFFER) {
1046 if (net_ratelimit()) {
1047 printk(KERN_DEBUG "%s: BC TX buffer full - "
1048 "dropping the oldest frame\n",
1049 tx->dev->name);
1050 }
1051 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
1052 } else
1053 tx->local->total_ps_buffered++;
1054 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
1055 return TXRX_QUEUED;
1056 }
1057
1058 return TXRX_CONTINUE;
1059 }
1060
1061
1062 static inline ieee80211_txrx_result
1063 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
1064 {
1065 struct sta_info *sta = tx->sta;
1066
1067 if (unlikely(!sta ||
1068 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1069 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
1070 return TXRX_CONTINUE;
1071
1072 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
1073 struct ieee80211_tx_packet_data *pkt_data;
1074 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1075 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
1076 "before %d)\n",
1077 MAC_ARG(sta->addr), sta->aid,
1078 skb_queue_len(&sta->ps_tx_buf));
1079 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1080 sta->flags |= WLAN_STA_TIM;
1081 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1082 purge_old_ps_buffers(tx->local);
1083 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
1084 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
1085 if (net_ratelimit()) {
1086 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
1087 "buffer full - dropping oldest frame\n",
1088 tx->dev->name, MAC_ARG(sta->addr));
1089 }
1090 dev_kfree_skb(old);
1091 } else
1092 tx->local->total_ps_buffered++;
1093 /* Queue frame to be sent after STA sends an PS Poll frame */
1094 if (skb_queue_empty(&sta->ps_tx_buf)) {
1095 if (tx->local->ops->set_tim)
1096 tx->local->ops->set_tim(local_to_hw(tx->local),
1097 sta->aid, 1);
1098 if (tx->sdata->bss)
1099 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
1100 }
1101 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
1102 pkt_data->jiffies = jiffies;
1103 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
1104 return TXRX_QUEUED;
1105 }
1106 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1107 else if (unlikely(sta->flags & WLAN_STA_PS)) {
1108 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
1109 "set -> send frame\n", tx->dev->name,
1110 MAC_ARG(sta->addr));
1111 }
1112 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1113 sta->pspoll = 0;
1114
1115 return TXRX_CONTINUE;
1116 }
1117
1118
1119 static ieee80211_txrx_result
1120 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
1121 {
1122 if (unlikely(tx->u.tx.ps_buffered))
1123 return TXRX_CONTINUE;
1124
1125 if (tx->u.tx.unicast)
1126 return ieee80211_tx_h_unicast_ps_buf(tx);
1127 else
1128 return ieee80211_tx_h_multicast_ps_buf(tx);
1129 }
1130
1131
1132 /*
1133 * deal with packet injection down monitor interface
1134 * with Radiotap Header -- only called for monitor mode interface
1135 */
1136
1137 static ieee80211_txrx_result
1138 __ieee80211_parse_tx_radiotap(
1139 struct ieee80211_txrx_data *tx,
1140 struct sk_buff *skb, struct ieee80211_tx_control *control)
1141 {
1142 /*
1143 * this is the moment to interpret and discard the radiotap header that
1144 * must be at the start of the packet injected in Monitor mode
1145 *
1146 * Need to take some care with endian-ness since radiotap
1147 * args are little-endian
1148 */
1149
1150 struct ieee80211_radiotap_iterator iterator;
1151 struct ieee80211_radiotap_header *rthdr =
1152 (struct ieee80211_radiotap_header *) skb->data;
1153 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
1154 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
1155
1156 /*
1157 * default control situation for all injected packets
1158 * FIXME: this does not suit all usage cases, expand to allow control
1159 */
1160
1161 control->retry_limit = 1; /* no retry */
1162 control->key_idx = -1; /* no encryption key */
1163 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1164 IEEE80211_TXCTL_USE_CTS_PROTECT);
1165 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
1166 IEEE80211_TXCTL_NO_ACK;
1167 control->antenna_sel_tx = 0; /* default to default antenna */
1168
1169 /*
1170 * for every radiotap entry that is present
1171 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1172 * entries present, or -EINVAL on error)
1173 */
1174
1175 while (!ret) {
1176 int i, target_rate;
1177
1178 ret = ieee80211_radiotap_iterator_next(&iterator);
1179
1180 if (ret)
1181 continue;
1182
1183 /* see if this argument is something we can use */
1184 switch (iterator.this_arg_index) {
1185 /*
1186 * You must take care when dereferencing iterator.this_arg
1187 * for multibyte types... the pointer is not aligned. Use
1188 * get_unaligned((type *)iterator.this_arg) to dereference
1189 * iterator.this_arg for type "type" safely on all arches.
1190 */
1191 case IEEE80211_RADIOTAP_RATE:
1192 /*
1193 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
1194 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
1195 */
1196 target_rate = (*iterator.this_arg) * 5;
1197 for (i = 0; i < mode->num_rates; i++) {
1198 struct ieee80211_rate *r = &mode->rates[i];
1199
1200 if (r->rate > target_rate)
1201 continue;
1202
1203 control->rate = r;
1204
1205 if (r->flags & IEEE80211_RATE_PREAMBLE2)
1206 control->tx_rate = r->val2;
1207 else
1208 control->tx_rate = r->val;
1209
1210 /* end on exact match */
1211 if (r->rate == target_rate)
1212 i = mode->num_rates;
1213 }
1214 break;
1215
1216 case IEEE80211_RADIOTAP_ANTENNA:
1217 /*
1218 * radiotap uses 0 for 1st ant, mac80211 is 1 for
1219 * 1st ant
1220 */
1221 control->antenna_sel_tx = (*iterator.this_arg) + 1;
1222 break;
1223
1224 case IEEE80211_RADIOTAP_DBM_TX_POWER:
1225 control->power_level = *iterator.this_arg;
1226 break;
1227
1228 case IEEE80211_RADIOTAP_FLAGS:
1229 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1230 /*
1231 * this indicates that the skb we have been
1232 * handed has the 32-bit FCS CRC at the end...
1233 * we should react to that by snipping it off
1234 * because it will be recomputed and added
1235 * on transmission
1236 */
1237 if (skb->len < (iterator.max_length + FCS_LEN))
1238 return TXRX_DROP;
1239
1240 skb_trim(skb, skb->len - FCS_LEN);
1241 }
1242 break;
1243
1244 default:
1245 break;
1246 }
1247 }
1248
1249 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1250 return TXRX_DROP;
1251
1252 /*
1253 * remove the radiotap header
1254 * iterator->max_length was sanity-checked against
1255 * skb->len by iterator init
1256 */
1257 skb_pull(skb, iterator.max_length);
1258
1259 return TXRX_CONTINUE;
1260 }
1261
1262
1263 static ieee80211_txrx_result inline
1264 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1265 struct sk_buff *skb,
1266 struct net_device *dev,
1267 struct ieee80211_tx_control *control)
1268 {
1269 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1271 struct ieee80211_sub_if_data *sdata;
1272 ieee80211_txrx_result res = TXRX_CONTINUE;
1273
1274 int hdrlen;
1275
1276 memset(tx, 0, sizeof(*tx));
1277 tx->skb = skb;
1278 tx->dev = dev; /* use original interface */
1279 tx->local = local;
1280 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1281 tx->sta = sta_info_get(local, hdr->addr1);
1282 tx->fc = le16_to_cpu(hdr->frame_control);
1283
1284 /*
1285 * set defaults for things that can be set by
1286 * injected radiotap headers
1287 */
1288 control->power_level = local->hw.conf.power_level;
1289 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1290 if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
1291 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
1292
1293 /* process and remove the injection radiotap header */
1294 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1295 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
1296 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
1297 TXRX_DROP) {
1298 return TXRX_DROP;
1299 }
1300 /*
1301 * we removed the radiotap header after this point,
1302 * we filled control with what we could use
1303 * set to the actual ieee header now
1304 */
1305 hdr = (struct ieee80211_hdr *) skb->data;
1306 res = TXRX_QUEUED; /* indication it was monitor packet */
1307 }
1308
1309 tx->u.tx.control = control;
1310 tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
1311 if (is_multicast_ether_addr(hdr->addr1))
1312 control->flags |= IEEE80211_TXCTL_NO_ACK;
1313 else
1314 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1315 tx->fragmented = local->fragmentation_threshold <
1316 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
1317 skb->len + FCS_LEN > local->fragmentation_threshold &&
1318 (!local->ops->set_frag_threshold);
1319 if (!tx->sta)
1320 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1321 else if (tx->sta->clear_dst_mask) {
1322 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1323 tx->sta->clear_dst_mask = 0;
1324 }
1325 hdrlen = ieee80211_get_hdrlen(tx->fc);
1326 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1327 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1328 tx->ethertype = (pos[0] << 8) | pos[1];
1329 }
1330 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1331
1332 return res;
1333 }
1334
1335 static int inline is_ieee80211_device(struct net_device *dev,
1336 struct net_device *master)
1337 {
1338 return (wdev_priv(dev->ieee80211_ptr) ==
1339 wdev_priv(master->ieee80211_ptr));
1340 }
1341
1342 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1343 * finished with it. */
1344 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1345 struct sk_buff *skb,
1346 struct net_device *mdev,
1347 struct ieee80211_tx_control *control)
1348 {
1349 struct ieee80211_tx_packet_data *pkt_data;
1350 struct net_device *dev;
1351
1352 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1353 dev = dev_get_by_index(pkt_data->ifindex);
1354 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1355 dev_put(dev);
1356 dev = NULL;
1357 }
1358 if (unlikely(!dev))
1359 return -ENODEV;
1360 __ieee80211_tx_prepare(tx, skb, dev, control);
1361 return 0;
1362 }
1363
1364 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
1365 int queue)
1366 {
1367 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
1368 }
1369
1370 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
1371 int queue)
1372 {
1373 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
1374 }
1375
1376 #define IEEE80211_TX_OK 0
1377 #define IEEE80211_TX_AGAIN 1
1378 #define IEEE80211_TX_FRAG_AGAIN 2
1379
1380 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1381 struct ieee80211_txrx_data *tx)
1382 {
1383 struct ieee80211_tx_control *control = tx->u.tx.control;
1384 int ret, i;
1385
1386 if (!ieee80211_qdisc_installed(local->mdev) &&
1387 __ieee80211_queue_stopped(local, 0)) {
1388 netif_stop_queue(local->mdev);
1389 return IEEE80211_TX_AGAIN;
1390 }
1391 if (skb) {
1392 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1393 ret = local->ops->tx(local_to_hw(local), skb, control);
1394 if (ret)
1395 return IEEE80211_TX_AGAIN;
1396 local->mdev->trans_start = jiffies;
1397 ieee80211_led_tx(local, 1);
1398 }
1399 if (tx->u.tx.extra_frag) {
1400 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1401 IEEE80211_TXCTL_USE_CTS_PROTECT |
1402 IEEE80211_TXCTL_CLEAR_DST_MASK |
1403 IEEE80211_TXCTL_FIRST_FRAGMENT);
1404 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1405 if (!tx->u.tx.extra_frag[i])
1406 continue;
1407 if (__ieee80211_queue_stopped(local, control->queue))
1408 return IEEE80211_TX_FRAG_AGAIN;
1409 if (i == tx->u.tx.num_extra_frag) {
1410 control->tx_rate = tx->u.tx.last_frag_hwrate;
1411 control->rate = tx->u.tx.last_frag_rate;
1412 if (tx->u.tx.probe_last_frag)
1413 control->flags |=
1414 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1415 else
1416 control->flags &=
1417 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1418 }
1419
1420 ieee80211_dump_frame(local->mdev->name,
1421 "TX to low-level driver",
1422 tx->u.tx.extra_frag[i]);
1423 ret = local->ops->tx(local_to_hw(local),
1424 tx->u.tx.extra_frag[i],
1425 control);
1426 if (ret)
1427 return IEEE80211_TX_FRAG_AGAIN;
1428 local->mdev->trans_start = jiffies;
1429 ieee80211_led_tx(local, 1);
1430 tx->u.tx.extra_frag[i] = NULL;
1431 }
1432 kfree(tx->u.tx.extra_frag);
1433 tx->u.tx.extra_frag = NULL;
1434 }
1435 return IEEE80211_TX_OK;
1436 }
1437
1438 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1439 struct ieee80211_tx_control *control, int mgmt)
1440 {
1441 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1442 struct sta_info *sta;
1443 ieee80211_tx_handler *handler;
1444 struct ieee80211_txrx_data tx;
1445 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1446 int ret, i;
1447
1448 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1449
1450 if (unlikely(skb->len < 10)) {
1451 dev_kfree_skb(skb);
1452 return 0;
1453 }
1454
1455 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1456
1457 if (res_prepare == TXRX_DROP) {
1458 dev_kfree_skb(skb);
1459 return 0;
1460 }
1461
1462 sta = tx.sta;
1463 tx.u.tx.mgmt_interface = mgmt;
1464 tx.u.tx.mode = local->hw.conf.mode;
1465
1466 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1467 res = TXRX_CONTINUE;
1468 } else {
1469 for (handler = local->tx_handlers; *handler != NULL;
1470 handler++) {
1471 res = (*handler)(&tx);
1472 if (res != TXRX_CONTINUE)
1473 break;
1474 }
1475 }
1476
1477 skb = tx.skb; /* handlers are allowed to change skb */
1478
1479 if (sta)
1480 sta_info_put(sta);
1481
1482 if (unlikely(res == TXRX_DROP)) {
1483 I802_DEBUG_INC(local->tx_handlers_drop);
1484 goto drop;
1485 }
1486
1487 if (unlikely(res == TXRX_QUEUED)) {
1488 I802_DEBUG_INC(local->tx_handlers_queued);
1489 return 0;
1490 }
1491
1492 if (tx.u.tx.extra_frag) {
1493 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1494 int next_len, dur;
1495 struct ieee80211_hdr *hdr =
1496 (struct ieee80211_hdr *)
1497 tx.u.tx.extra_frag[i]->data;
1498
1499 if (i + 1 < tx.u.tx.num_extra_frag) {
1500 next_len = tx.u.tx.extra_frag[i + 1]->len;
1501 } else {
1502 next_len = 0;
1503 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1504 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1505 }
1506 dur = ieee80211_duration(&tx, 0, next_len);
1507 hdr->duration_id = cpu_to_le16(dur);
1508 }
1509 }
1510
1511 retry:
1512 ret = __ieee80211_tx(local, skb, &tx);
1513 if (ret) {
1514 struct ieee80211_tx_stored_packet *store =
1515 &local->pending_packet[control->queue];
1516
1517 if (ret == IEEE80211_TX_FRAG_AGAIN)
1518 skb = NULL;
1519 set_bit(IEEE80211_LINK_STATE_PENDING,
1520 &local->state[control->queue]);
1521 smp_mb();
1522 /* When the driver gets out of buffers during sending of
1523 * fragments and calls ieee80211_stop_queue, there is
1524 * a small window between IEEE80211_LINK_STATE_XOFF and
1525 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1526 * gets available in that window (i.e. driver calls
1527 * ieee80211_wake_queue), we would end up with ieee80211_tx
1528 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1529 * continuing transmitting here when that situation is
1530 * possible to have happened. */
1531 if (!__ieee80211_queue_stopped(local, control->queue)) {
1532 clear_bit(IEEE80211_LINK_STATE_PENDING,
1533 &local->state[control->queue]);
1534 goto retry;
1535 }
1536 memcpy(&store->control, control,
1537 sizeof(struct ieee80211_tx_control));
1538 store->skb = skb;
1539 store->extra_frag = tx.u.tx.extra_frag;
1540 store->num_extra_frag = tx.u.tx.num_extra_frag;
1541 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1542 store->last_frag_rate = tx.u.tx.last_frag_rate;
1543 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1544 }
1545 return 0;
1546
1547 drop:
1548 if (skb)
1549 dev_kfree_skb(skb);
1550 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1551 if (tx.u.tx.extra_frag[i])
1552 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1553 kfree(tx.u.tx.extra_frag);
1554 return 0;
1555 }
1556
1557 static void ieee80211_tx_pending(unsigned long data)
1558 {
1559 struct ieee80211_local *local = (struct ieee80211_local *)data;
1560 struct net_device *dev = local->mdev;
1561 struct ieee80211_tx_stored_packet *store;
1562 struct ieee80211_txrx_data tx;
1563 int i, ret, reschedule = 0;
1564
1565 netif_tx_lock_bh(dev);
1566 for (i = 0; i < local->hw.queues; i++) {
1567 if (__ieee80211_queue_stopped(local, i))
1568 continue;
1569 if (!__ieee80211_queue_pending(local, i)) {
1570 reschedule = 1;
1571 continue;
1572 }
1573 store = &local->pending_packet[i];
1574 tx.u.tx.control = &store->control;
1575 tx.u.tx.extra_frag = store->extra_frag;
1576 tx.u.tx.num_extra_frag = store->num_extra_frag;
1577 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1578 tx.u.tx.last_frag_rate = store->last_frag_rate;
1579 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1580 ret = __ieee80211_tx(local, store->skb, &tx);
1581 if (ret) {
1582 if (ret == IEEE80211_TX_FRAG_AGAIN)
1583 store->skb = NULL;
1584 } else {
1585 clear_bit(IEEE80211_LINK_STATE_PENDING,
1586 &local->state[i]);
1587 reschedule = 1;
1588 }
1589 }
1590 netif_tx_unlock_bh(dev);
1591 if (reschedule) {
1592 if (!ieee80211_qdisc_installed(dev)) {
1593 if (!__ieee80211_queue_stopped(local, 0))
1594 netif_wake_queue(dev);
1595 } else
1596 netif_schedule(dev);
1597 }
1598 }
1599
1600 static void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1601 {
1602 int i, j;
1603 struct ieee80211_tx_stored_packet *store;
1604
1605 for (i = 0; i < local->hw.queues; i++) {
1606 if (!__ieee80211_queue_pending(local, i))
1607 continue;
1608 store = &local->pending_packet[i];
1609 kfree_skb(store->skb);
1610 for (j = 0; j < store->num_extra_frag; j++)
1611 kfree_skb(store->extra_frag[j]);
1612 kfree(store->extra_frag);
1613 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1614 }
1615 }
1616
1617 static int ieee80211_master_start_xmit(struct sk_buff *skb,
1618 struct net_device *dev)
1619 {
1620 struct ieee80211_tx_control control;
1621 struct ieee80211_tx_packet_data *pkt_data;
1622 struct net_device *odev = NULL;
1623 struct ieee80211_sub_if_data *osdata;
1624 int headroom;
1625 int ret;
1626
1627 /*
1628 * copy control out of the skb so other people can use skb->cb
1629 */
1630 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1631 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1632
1633 if (pkt_data->ifindex)
1634 odev = dev_get_by_index(pkt_data->ifindex);
1635 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1636 dev_put(odev);
1637 odev = NULL;
1638 }
1639 if (unlikely(!odev)) {
1640 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1641 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1642 "originating device\n", dev->name);
1643 #endif
1644 dev_kfree_skb(skb);
1645 return 0;
1646 }
1647 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1648
1649 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1650 if (skb_headroom(skb) < headroom) {
1651 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1652 dev_kfree_skb(skb);
1653 return 0;
1654 }
1655 }
1656
1657 control.ifindex = odev->ifindex;
1658 control.type = osdata->type;
1659 if (pkt_data->req_tx_status)
1660 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1661 if (pkt_data->do_not_encrypt)
1662 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1663 if (pkt_data->requeue)
1664 control.flags |= IEEE80211_TXCTL_REQUEUE;
1665 control.queue = pkt_data->queue;
1666
1667 ret = ieee80211_tx(odev, skb, &control,
1668 control.type == IEEE80211_IF_TYPE_MGMT);
1669 dev_put(odev);
1670
1671 return ret;
1672 }
1673
1674
1675 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1676 struct net_device *dev)
1677 {
1678 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1679 struct ieee80211_tx_packet_data *pkt_data;
1680 struct ieee80211_radiotap_header *prthdr =
1681 (struct ieee80211_radiotap_header *)skb->data;
1682 u16 len;
1683
1684 /*
1685 * there must be a radiotap header at the
1686 * start in this case
1687 */
1688 if (unlikely(prthdr->it_version)) {
1689 /* only version 0 is supported */
1690 dev_kfree_skb(skb);
1691 return NETDEV_TX_OK;
1692 }
1693
1694 skb->dev = local->mdev;
1695
1696 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1697 memset(pkt_data, 0, sizeof(*pkt_data));
1698 pkt_data->ifindex = dev->ifindex;
1699 pkt_data->mgmt_iface = 0;
1700 pkt_data->do_not_encrypt = 1;
1701
1702 /* above needed because we set skb device to master */
1703
1704 /*
1705 * fix up the pointers accounting for the radiotap
1706 * header still being in there. We are being given
1707 * a precooked IEEE80211 header so no need for
1708 * normal processing
1709 */
1710 len = le16_to_cpu(get_unaligned(&prthdr->it_len));
1711 skb_set_mac_header(skb, len);
1712 skb_set_network_header(skb, len + sizeof(struct ieee80211_hdr));
1713 skb_set_transport_header(skb, len + sizeof(struct ieee80211_hdr));
1714
1715 /*
1716 * pass the radiotap header up to
1717 * the next stage intact
1718 */
1719 dev_queue_xmit(skb);
1720
1721 return NETDEV_TX_OK;
1722 }
1723
1724
1725 /**
1726 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1727 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1728 * @skb: packet to be sent
1729 * @dev: incoming interface
1730 *
1731 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1732 * not be freed, and caller is responsible for either retrying later or freeing
1733 * skb).
1734 *
1735 * This function takes in an Ethernet header and encapsulates it with suitable
1736 * IEEE 802.11 header based on which interface the packet is coming in. The
1737 * encapsulated packet will then be passed to master interface, wlan#.11, for
1738 * transmission (through low-level driver).
1739 */
1740 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1741 struct net_device *dev)
1742 {
1743 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1744 struct ieee80211_tx_packet_data *pkt_data;
1745 struct ieee80211_sub_if_data *sdata;
1746 int ret = 1, head_need;
1747 u16 ethertype, hdrlen, fc;
1748 struct ieee80211_hdr hdr;
1749 const u8 *encaps_data;
1750 int encaps_len, skip_header_bytes;
1751 int nh_pos, h_pos, no_encrypt = 0;
1752 struct sta_info *sta;
1753
1754 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1755 if (unlikely(skb->len < ETH_HLEN)) {
1756 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1757 dev->name, skb->len);
1758 ret = 0;
1759 goto fail;
1760 }
1761
1762 nh_pos = skb_network_header(skb) - skb->data;
1763 h_pos = skb_transport_header(skb) - skb->data;
1764
1765 /* convert Ethernet header to proper 802.11 header (based on
1766 * operation mode) */
1767 ethertype = (skb->data[12] << 8) | skb->data[13];
1768 /* TODO: handling for 802.1x authorized/unauthorized port */
1769 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1770
1771 if (likely(sdata->type == IEEE80211_IF_TYPE_AP ||
1772 sdata->type == IEEE80211_IF_TYPE_VLAN)) {
1773 fc |= IEEE80211_FCTL_FROMDS;
1774 /* DA BSSID SA */
1775 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1776 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1777 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1778 hdrlen = 24;
1779 } else if (sdata->type == IEEE80211_IF_TYPE_WDS) {
1780 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1781 /* RA TA DA SA */
1782 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1783 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1784 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1785 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1786 hdrlen = 30;
1787 } else if (sdata->type == IEEE80211_IF_TYPE_STA) {
1788 fc |= IEEE80211_FCTL_TODS;
1789 /* BSSID SA DA */
1790 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1791 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1792 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1793 hdrlen = 24;
1794 } else if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
1795 /* DA SA BSSID */
1796 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1797 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1798 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1799 hdrlen = 24;
1800 } else {
1801 ret = 0;
1802 goto fail;
1803 }
1804
1805 /* receiver is QoS enabled, use a QoS type frame */
1806 sta = sta_info_get(local, hdr.addr1);
1807 if (sta) {
1808 if (sta->flags & WLAN_STA_WME) {
1809 fc |= IEEE80211_STYPE_QOS_DATA;
1810 hdrlen += 2;
1811 }
1812 sta_info_put(sta);
1813 }
1814
1815 hdr.frame_control = cpu_to_le16(fc);
1816 hdr.duration_id = 0;
1817 hdr.seq_ctrl = 0;
1818
1819 skip_header_bytes = ETH_HLEN;
1820 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1821 encaps_data = bridge_tunnel_header;
1822 encaps_len = sizeof(bridge_tunnel_header);
1823 skip_header_bytes -= 2;
1824 } else if (ethertype >= 0x600) {
1825 encaps_data = rfc1042_header;
1826 encaps_len = sizeof(rfc1042_header);
1827 skip_header_bytes -= 2;
1828 } else {
1829 encaps_data = NULL;
1830 encaps_len = 0;
1831 }
1832
1833 skb_pull(skb, skip_header_bytes);
1834 nh_pos -= skip_header_bytes;
1835 h_pos -= skip_header_bytes;
1836
1837 /* TODO: implement support for fragments so that there is no need to
1838 * reallocate and copy payload; it might be enough to support one
1839 * extra fragment that would be copied in the beginning of the frame
1840 * data.. anyway, it would be nice to include this into skb structure
1841 * somehow
1842 *
1843 * There are few options for this:
1844 * use skb->cb as an extra space for 802.11 header
1845 * allocate new buffer if not enough headroom
1846 * make sure that there is enough headroom in every skb by increasing
1847 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1848 * alloc_skb() (net/core/skbuff.c)
1849 */
1850 head_need = hdrlen + encaps_len + local->tx_headroom;
1851 head_need -= skb_headroom(skb);
1852
1853 /* We are going to modify skb data, so make a copy of it if happens to
1854 * be cloned. This could happen, e.g., with Linux bridge code passing
1855 * us broadcast frames. */
1856
1857 if (head_need > 0 || skb_cloned(skb)) {
1858 #if 0
1859 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1860 "of headroom\n", dev->name, head_need);
1861 #endif
1862
1863 if (skb_cloned(skb))
1864 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1865 else
1866 I802_DEBUG_INC(local->tx_expand_skb_head);
1867 /* Since we have to reallocate the buffer, make sure that there
1868 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1869 * before payload and 12 after). */
1870 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1871 12, GFP_ATOMIC)) {
1872 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1873 "\n", dev->name);
1874 goto fail;
1875 }
1876 }
1877
1878 if (encaps_data) {
1879 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1880 nh_pos += encaps_len;
1881 h_pos += encaps_len;
1882 }
1883 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1884 nh_pos += hdrlen;
1885 h_pos += hdrlen;
1886
1887 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1888 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1889 pkt_data->ifindex = dev->ifindex;
1890 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1891 pkt_data->do_not_encrypt = no_encrypt;
1892
1893 skb->dev = local->mdev;
1894 sdata->stats.tx_packets++;
1895 sdata->stats.tx_bytes += skb->len;
1896
1897 /* Update skb pointers to various headers since this modified frame
1898 * is going to go through Linux networking code that may potentially
1899 * need things like pointer to IP header. */
1900 skb_set_mac_header(skb, 0);
1901 skb_set_network_header(skb, nh_pos);
1902 skb_set_transport_header(skb, h_pos);
1903
1904 dev->trans_start = jiffies;
1905 dev_queue_xmit(skb);
1906
1907 return 0;
1908
1909 fail:
1910 if (!ret)
1911 dev_kfree_skb(skb);
1912
1913 return ret;
1914 }
1915
1916
1917 /*
1918 * This is the transmit routine for the 802.11 type interfaces
1919 * called by upper layers of the linux networking
1920 * stack when it has a frame to transmit
1921 */
1922 static int
1923 ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1924 {
1925 struct ieee80211_sub_if_data *sdata;
1926 struct ieee80211_tx_packet_data *pkt_data;
1927 struct ieee80211_hdr *hdr;
1928 u16 fc;
1929
1930 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1931
1932 if (skb->len < 10) {
1933 dev_kfree_skb(skb);
1934 return 0;
1935 }
1936
1937 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1938 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1939 0, GFP_ATOMIC)) {
1940 dev_kfree_skb(skb);
1941 return 0;
1942 }
1943 }
1944
1945 hdr = (struct ieee80211_hdr *) skb->data;
1946 fc = le16_to_cpu(hdr->frame_control);
1947
1948 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1949 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1950 pkt_data->ifindex = sdata->dev->ifindex;
1951 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1952
1953 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1954 skb->dev = sdata->local->mdev;
1955
1956 /*
1957 * We're using the protocol field of the the frame control header
1958 * to request TX callback for hostapd. BIT(1) is checked.
1959 */
1960 if ((fc & BIT(1)) == BIT(1)) {
1961 pkt_data->req_tx_status = 1;
1962 fc &= ~BIT(1);
1963 hdr->frame_control = cpu_to_le16(fc);
1964 }
1965
1966 pkt_data->do_not_encrypt = !(fc & IEEE80211_FCTL_PROTECTED);
1967
1968 sdata->stats.tx_packets++;
1969 sdata->stats.tx_bytes += skb->len;
1970
1971 dev_queue_xmit(skb);
1972
1973 return 0;
1974 }
1975
1976
1977 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1978 struct ieee80211_if_ap *bss,
1979 struct sk_buff *skb)
1980 {
1981 u8 *pos, *tim;
1982 int aid0 = 0;
1983 int i, have_bits = 0, n1, n2;
1984
1985 /* Generate bitmap for TIM only if there are any STAs in power save
1986 * mode. */
1987 spin_lock_bh(&local->sta_lock);
1988 if (atomic_read(&bss->num_sta_ps) > 0)
1989 /* in the hope that this is faster than
1990 * checking byte-for-byte */
1991 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1992 IEEE80211_MAX_AID+1);
1993
1994 if (bss->dtim_count == 0)
1995 bss->dtim_count = bss->dtim_period - 1;
1996 else
1997 bss->dtim_count--;
1998
1999 tim = pos = (u8 *) skb_put(skb, 6);
2000 *pos++ = WLAN_EID_TIM;
2001 *pos++ = 4;
2002 *pos++ = bss->dtim_count;
2003 *pos++ = bss->dtim_period;
2004
2005 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2006 aid0 = 1;
2007
2008 if (have_bits) {
2009 /* Find largest even number N1 so that bits numbered 1 through
2010 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2011 * (N2 + 1) x 8 through 2007 are 0. */
2012 n1 = 0;
2013 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2014 if (bss->tim[i]) {
2015 n1 = i & 0xfe;
2016 break;
2017 }
2018 }
2019 n2 = n1;
2020 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2021 if (bss->tim[i]) {
2022 n2 = i;
2023 break;
2024 }
2025 }
2026
2027 /* Bitmap control */
2028 *pos++ = n1 | aid0;
2029 /* Part Virt Bitmap */
2030 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2031
2032 tim[1] = n2 - n1 + 4;
2033 skb_put(skb, n2 - n1);
2034 } else {
2035 *pos++ = aid0; /* Bitmap control */
2036 *pos++ = 0; /* Part Virt Bitmap */
2037 }
2038 spin_unlock_bh(&local->sta_lock);
2039 }
2040
2041
2042 struct sk_buff * ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
2043 struct ieee80211_tx_control *control)
2044 {
2045 struct ieee80211_local *local = hw_to_local(hw);
2046 struct sk_buff *skb;
2047 struct net_device *bdev;
2048 struct ieee80211_sub_if_data *sdata = NULL;
2049 struct ieee80211_if_ap *ap = NULL;
2050 struct ieee80211_rate *rate;
2051 struct rate_control_extra extra;
2052 u8 *b_head, *b_tail;
2053 int bh_len, bt_len;
2054
2055 bdev = dev_get_by_index(if_id);
2056 if (bdev) {
2057 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
2058 ap = &sdata->u.ap;
2059 dev_put(bdev);
2060 }
2061
2062 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
2063 !ap->beacon_head) {
2064 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2065 if (net_ratelimit())
2066 printk(KERN_DEBUG "no beacon data avail for idx=%d "
2067 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
2068 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2069 return NULL;
2070 }
2071
2072 /* Assume we are generating the normal beacon locally */
2073 b_head = ap->beacon_head;
2074 b_tail = ap->beacon_tail;
2075 bh_len = ap->beacon_head_len;
2076 bt_len = ap->beacon_tail_len;
2077
2078 skb = dev_alloc_skb(local->tx_headroom +
2079 bh_len + bt_len + 256 /* maximum TIM len */);
2080 if (!skb)
2081 return NULL;
2082
2083 skb_reserve(skb, local->tx_headroom);
2084 memcpy(skb_put(skb, bh_len), b_head, bh_len);
2085
2086 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
2087
2088 ieee80211_beacon_add_tim(local, ap, skb);
2089
2090 if (b_tail) {
2091 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
2092 }
2093
2094 if (control) {
2095 memset(&extra, 0, sizeof(extra));
2096 extra.mode = local->oper_hw_mode;
2097
2098 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
2099 if (!rate) {
2100 if (net_ratelimit()) {
2101 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
2102 "found\n", local->mdev->name);
2103 }
2104 dev_kfree_skb(skb);
2105 return NULL;
2106 }
2107
2108 control->tx_rate = (local->short_preamble &&
2109 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2110 rate->val2 : rate->val;
2111 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2112 control->power_level = local->hw.conf.power_level;
2113 control->flags |= IEEE80211_TXCTL_NO_ACK;
2114 control->retry_limit = 1;
2115 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
2116 }
2117
2118 ap->num_beacons++;
2119 return skb;
2120 }
2121 EXPORT_SYMBOL(ieee80211_beacon_get);
2122
2123 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
2124 size_t frame_len,
2125 const struct ieee80211_tx_control *frame_txctl)
2126 {
2127 struct ieee80211_local *local = hw_to_local(hw);
2128 struct ieee80211_rate *rate;
2129 int short_preamble = local->short_preamble;
2130 int erp;
2131 u16 dur;
2132
2133 rate = frame_txctl->rts_rate;
2134 erp = !!(rate->flags & IEEE80211_RATE_ERP);
2135
2136 /* CTS duration */
2137 dur = ieee80211_frame_duration(local, 10, rate->rate,
2138 erp, short_preamble);
2139 /* Data frame duration */
2140 dur += ieee80211_frame_duration(local, frame_len, rate->rate,
2141 erp, short_preamble);
2142 /* ACK duration */
2143 dur += ieee80211_frame_duration(local, 10, rate->rate,
2144 erp, short_preamble);
2145
2146 return cpu_to_le16(dur);
2147 }
2148 EXPORT_SYMBOL(ieee80211_rts_duration);
2149
2150
2151 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
2152 size_t frame_len,
2153 const struct ieee80211_tx_control *frame_txctl)
2154 {
2155 struct ieee80211_local *local = hw_to_local(hw);
2156 struct ieee80211_rate *rate;
2157 int short_preamble = local->short_preamble;
2158 int erp;
2159 u16 dur;
2160
2161 rate = frame_txctl->rts_rate;
2162 erp = !!(rate->flags & IEEE80211_RATE_ERP);
2163
2164 /* Data frame duration */
2165 dur = ieee80211_frame_duration(local, frame_len, rate->rate,
2166 erp, short_preamble);
2167 if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
2168 /* ACK duration */
2169 dur += ieee80211_frame_duration(local, 10, rate->rate,
2170 erp, short_preamble);
2171 }
2172
2173 return cpu_to_le16(dur);
2174 }
2175 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
2176
2177 void ieee80211_rts_get(struct ieee80211_hw *hw,
2178 const void *frame, size_t frame_len,
2179 const struct ieee80211_tx_control *frame_txctl,
2180 struct ieee80211_rts *rts)
2181 {
2182 const struct ieee80211_hdr *hdr = frame;
2183 u16 fctl;
2184
2185 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
2186 rts->frame_control = cpu_to_le16(fctl);
2187 rts->duration = ieee80211_rts_duration(hw, frame_len, frame_txctl);
2188 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2189 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2190 }
2191 EXPORT_SYMBOL(ieee80211_rts_get);
2192
2193 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
2194 const void *frame, size_t frame_len,
2195 const struct ieee80211_tx_control *frame_txctl,
2196 struct ieee80211_cts *cts)
2197 {
2198 const struct ieee80211_hdr *hdr = frame;
2199 u16 fctl;
2200
2201 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
2202 cts->frame_control = cpu_to_le16(fctl);
2203 cts->duration = ieee80211_ctstoself_duration(hw, frame_len, frame_txctl);
2204 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2205 }
2206 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2207
2208 struct sk_buff *
2209 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
2210 struct ieee80211_tx_control *control)
2211 {
2212 struct ieee80211_local *local = hw_to_local(hw);
2213 struct sk_buff *skb;
2214 struct sta_info *sta;
2215 ieee80211_tx_handler *handler;
2216 struct ieee80211_txrx_data tx;
2217 ieee80211_txrx_result res = TXRX_DROP;
2218 struct net_device *bdev;
2219 struct ieee80211_sub_if_data *sdata;
2220 struct ieee80211_if_ap *bss = NULL;
2221
2222 bdev = dev_get_by_index(if_id);
2223 if (bdev) {
2224 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
2225 bss = &sdata->u.ap;
2226 dev_put(bdev);
2227 }
2228 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
2229 return NULL;
2230
2231 if (bss->dtim_count != 0)
2232 return NULL; /* send buffered bc/mc only after DTIM beacon */
2233 memset(control, 0, sizeof(*control));
2234 while (1) {
2235 skb = skb_dequeue(&bss->ps_bc_buf);
2236 if (!skb)
2237 return NULL;
2238 local->total_ps_buffered--;
2239
2240 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2241 struct ieee80211_hdr *hdr =
2242 (struct ieee80211_hdr *) skb->data;
2243 /* more buffered multicast/broadcast frames ==> set
2244 * MoreData flag in IEEE 802.11 header to inform PS
2245 * STAs */
2246 hdr->frame_control |=
2247 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2248 }
2249
2250 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
2251 break;
2252 dev_kfree_skb_any(skb);
2253 }
2254 sta = tx.sta;
2255 tx.u.tx.ps_buffered = 1;
2256
2257 for (handler = local->tx_handlers; *handler != NULL; handler++) {
2258 res = (*handler)(&tx);
2259 if (res == TXRX_DROP || res == TXRX_QUEUED)
2260 break;
2261 }
2262 dev_put(tx.dev);
2263 skb = tx.skb; /* handlers are allowed to change skb */
2264
2265 if (res == TXRX_DROP) {
2266 I802_DEBUG_INC(local->tx_handlers_drop);
2267 dev_kfree_skb(skb);
2268 skb = NULL;
2269 } else if (res == TXRX_QUEUED) {
2270 I802_DEBUG_INC(local->tx_handlers_queued);
2271 skb = NULL;
2272 }
2273
2274 if (sta)
2275 sta_info_put(sta);
2276
2277 return skb;
2278 }
2279 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2280
2281 static int __ieee80211_if_config(struct net_device *dev,
2282 struct sk_buff *beacon,
2283 struct ieee80211_tx_control *control)
2284 {
2285 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2286 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2287 struct ieee80211_if_conf conf;
2288 static u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
2289
2290 if (!local->ops->config_interface || !netif_running(dev))
2291 return 0;
2292
2293 memset(&conf, 0, sizeof(conf));
2294 conf.type = sdata->type;
2295 if (sdata->type == IEEE80211_IF_TYPE_STA ||
2296 sdata->type == IEEE80211_IF_TYPE_IBSS) {
2297 if (local->sta_scanning &&
2298 local->scan_dev == dev)
2299 conf.bssid = scan_bssid;
2300 else
2301 conf.bssid = sdata->u.sta.bssid;
2302 conf.ssid = sdata->u.sta.ssid;
2303 conf.ssid_len = sdata->u.sta.ssid_len;
2304 conf.generic_elem = sdata->u.sta.extra_ie;
2305 conf.generic_elem_len = sdata->u.sta.extra_ie_len;
2306 } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
2307 conf.ssid = sdata->u.ap.ssid;
2308 conf.ssid_len = sdata->u.ap.ssid_len;
2309 conf.generic_elem = sdata->u.ap.generic_elem;
2310 conf.generic_elem_len = sdata->u.ap.generic_elem_len;
2311 conf.beacon = beacon;
2312 conf.beacon_control = control;
2313 }
2314 return local->ops->config_interface(local_to_hw(local),
2315 dev->ifindex, &conf);
2316 }
2317
2318 int ieee80211_if_config(struct net_device *dev)
2319 {
2320 return __ieee80211_if_config(dev, NULL, NULL);
2321 }
2322
2323 int ieee80211_if_config_beacon(struct net_device *dev)
2324 {
2325 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2326 struct ieee80211_tx_control control;
2327 struct sk_buff *skb;
2328
2329 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
2330 return 0;
2331 skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
2332 if (!skb)
2333 return -ENOMEM;
2334 return __ieee80211_if_config(dev, skb, &control);
2335 }
2336
2337 int ieee80211_hw_config(struct ieee80211_local *local)
2338 {
2339 struct ieee80211_hw_mode *mode;
2340 struct ieee80211_channel *chan;
2341 int ret = 0;
2342
2343 if (local->sta_scanning) {
2344 chan = local->scan_channel;
2345 mode = local->scan_hw_mode;
2346 } else {
2347 chan = local->oper_channel;
2348 mode = local->oper_hw_mode;
2349 }
2350
2351 local->hw.conf.channel = chan->chan;
2352 local->hw.conf.channel_val = chan->val;
2353 local->hw.conf.power_level = chan->power_level;
2354 local->hw.conf.freq = chan->freq;
2355 local->hw.conf.phymode = mode->mode;
2356 local->hw.conf.antenna_max = chan->antenna_max;
2357 local->hw.conf.chan = chan;
2358 local->hw.conf.mode = mode;
2359
2360 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2361 printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
2362 "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
2363 local->hw.conf.phymode);
2364 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2365
2366 if (local->ops->config)
2367 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
2368
2369 return ret;
2370 }
2371
2372
2373 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
2374 {
2375 /* FIX: what would be proper limits for MTU?
2376 * This interface uses 802.3 frames. */
2377 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
2378 printk(KERN_WARNING "%s: invalid MTU %d\n",
2379 dev->name, new_mtu);
2380 return -EINVAL;
2381 }
2382
2383 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2384 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2385 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2386 dev->mtu = new_mtu;
2387 return 0;
2388 }
2389
2390
2391 static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
2392 {
2393 /* FIX: what would be proper limits for MTU?
2394 * This interface uses 802.11 frames. */
2395 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
2396 printk(KERN_WARNING "%s: invalid MTU %d\n",
2397 dev->name, new_mtu);
2398 return -EINVAL;
2399 }
2400
2401 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2402 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2403 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2404 dev->mtu = new_mtu;
2405 return 0;
2406 }
2407
2408 enum netif_tx_lock_class {
2409 TX_LOCK_NORMAL,
2410 TX_LOCK_MASTER,
2411 };
2412
2413 static inline void netif_tx_lock_nested(struct net_device *dev, int subclass)
2414 {
2415 spin_lock_nested(&dev->_xmit_lock, subclass);
2416 dev->xmit_lock_owner = smp_processor_id();
2417 }
2418
2419 static void ieee80211_set_multicast_list(struct net_device *dev)
2420 {
2421 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2422 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2423 unsigned short flags;
2424
2425 netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
2426 if (((dev->flags & IFF_ALLMULTI) != 0) ^ (sdata->allmulti != 0)) {
2427 if (sdata->allmulti) {
2428 sdata->allmulti = 0;
2429 local->iff_allmultis--;
2430 } else {
2431 sdata->allmulti = 1;
2432 local->iff_allmultis++;
2433 }
2434 }
2435 if (((dev->flags & IFF_PROMISC) != 0) ^ (sdata->promisc != 0)) {
2436 if (sdata->promisc) {
2437 sdata->promisc = 0;
2438 local->iff_promiscs--;
2439 } else {
2440 sdata->promisc = 1;
2441 local->iff_promiscs++;
2442 }
2443 }
2444 if (dev->mc_count != sdata->mc_count) {
2445 local->mc_count = local->mc_count - sdata->mc_count +
2446 dev->mc_count;
2447 sdata->mc_count = dev->mc_count;
2448 }
2449 if (local->ops->set_multicast_list) {
2450 flags = local->mdev->flags;
2451 if (local->iff_allmultis)
2452 flags |= IFF_ALLMULTI;
2453 if (local->iff_promiscs)
2454 flags |= IFF_PROMISC;
2455 read_lock(&local->sub_if_lock);
2456 local->ops->set_multicast_list(local_to_hw(local), flags,
2457 local->mc_count);
2458 read_unlock(&local->sub_if_lock);
2459 }
2460 netif_tx_unlock(local->mdev);
2461 }
2462
2463 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
2464 struct dev_mc_list *prev,
2465 void **ptr)
2466 {
2467 struct ieee80211_local *local = hw_to_local(hw);
2468 struct ieee80211_sub_if_data *sdata = *ptr;
2469 struct dev_mc_list *mc;
2470
2471 if (!prev) {
2472 WARN_ON(sdata);
2473 sdata = NULL;
2474 }
2475 if (!prev || !prev->next) {
2476 if (sdata)
2477 sdata = list_entry(sdata->list.next,
2478 struct ieee80211_sub_if_data, list);
2479 else
2480 sdata = list_entry(local->sub_if_list.next,
2481 struct ieee80211_sub_if_data, list);
2482 if (&sdata->list != &local->sub_if_list)
2483 mc = sdata->dev->mc_list;
2484 else
2485 mc = NULL;
2486 } else
2487 mc = prev->next;
2488
2489 *ptr = sdata;
2490 return mc;
2491 }
2492 EXPORT_SYMBOL(ieee80211_get_mc_list_item);
2493
2494 static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
2495 {
2496 struct ieee80211_sub_if_data *sdata;
2497 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2498 return &(sdata->stats);
2499 }
2500
2501 static void ieee80211_if_shutdown(struct net_device *dev)
2502 {
2503 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2504 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2505
2506 ASSERT_RTNL();
2507 switch (sdata->type) {
2508 case IEEE80211_IF_TYPE_STA:
2509 case IEEE80211_IF_TYPE_IBSS:
2510 sdata->u.sta.state = IEEE80211_DISABLED;
2511 del_timer_sync(&sdata->u.sta.timer);
2512 skb_queue_purge(&sdata->u.sta.skb_queue);
2513 if (!local->ops->hw_scan &&
2514 local->scan_dev == sdata->dev) {
2515 local->sta_scanning = 0;
2516 cancel_delayed_work(&local->scan_work);
2517 }
2518 flush_workqueue(local->hw.workqueue);
2519 break;
2520 }
2521 }
2522
2523 static inline int identical_mac_addr_allowed(int type1, int type2)
2524 {
2525 return (type1 == IEEE80211_IF_TYPE_MNTR ||
2526 type2 == IEEE80211_IF_TYPE_MNTR ||
2527 (type1 == IEEE80211_IF_TYPE_AP &&
2528 type2 == IEEE80211_IF_TYPE_WDS) ||
2529 (type1 == IEEE80211_IF_TYPE_WDS &&
2530 (type2 == IEEE80211_IF_TYPE_WDS ||
2531 type2 == IEEE80211_IF_TYPE_AP)) ||
2532 (type1 == IEEE80211_IF_TYPE_AP &&
2533 type2 == IEEE80211_IF_TYPE_VLAN) ||
2534 (type1 == IEEE80211_IF_TYPE_VLAN &&
2535 (type2 == IEEE80211_IF_TYPE_AP ||
2536 type2 == IEEE80211_IF_TYPE_VLAN)));
2537 }
2538
2539 static int ieee80211_master_open(struct net_device *dev)
2540 {
2541 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2542 struct ieee80211_sub_if_data *sdata;
2543 int res = -EOPNOTSUPP;
2544
2545 read_lock(&local->sub_if_lock);
2546 list_for_each_entry(sdata, &local->sub_if_list, list) {
2547 if (sdata->dev != dev && netif_running(sdata->dev)) {
2548 res = 0;
2549 break;
2550 }
2551 }
2552 read_unlock(&local->sub_if_lock);
2553 return res;
2554 }
2555
2556 static int ieee80211_master_stop(struct net_device *dev)
2557 {
2558 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2559 struct ieee80211_sub_if_data *sdata;
2560
2561 read_lock(&local->sub_if_lock);
2562 list_for_each_entry(sdata, &local->sub_if_list, list)
2563 if (sdata->dev != dev && netif_running(sdata->dev))
2564 dev_close(sdata->dev);
2565 read_unlock(&local->sub_if_lock);
2566
2567 return 0;
2568 }
2569
2570 static int ieee80211_mgmt_open(struct net_device *dev)
2571 {
2572 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2573
2574 if (!netif_running(local->mdev))
2575 return -EOPNOTSUPP;
2576 return 0;
2577 }
2578
2579 static int ieee80211_mgmt_stop(struct net_device *dev)
2580 {
2581 return 0;
2582 }
2583
2584 /* Check if running monitor interfaces should go to a "soft monitor" mode
2585 * and switch them if necessary. */
2586 static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
2587 {
2588 struct ieee80211_if_init_conf conf;
2589
2590 if (local->open_count && local->open_count == local->monitors &&
2591 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
2592 local->ops->remove_interface) {
2593 conf.if_id = -1;
2594 conf.type = IEEE80211_IF_TYPE_MNTR;
2595 conf.mac_addr = NULL;
2596 local->ops->remove_interface(local_to_hw(local), &conf);
2597 }
2598 }
2599
2600 /* Check if running monitor interfaces should go to a "hard monitor" mode
2601 * and switch them if necessary. */
2602 static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
2603 {
2604 struct ieee80211_if_init_conf conf;
2605
2606 if (local->open_count && local->open_count == local->monitors &&
2607 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2608 conf.if_id = -1;
2609 conf.type = IEEE80211_IF_TYPE_MNTR;
2610 conf.mac_addr = NULL;
2611 local->ops->add_interface(local_to_hw(local), &conf);
2612 }
2613 }
2614
2615 static int ieee80211_open(struct net_device *dev)
2616 {
2617 struct ieee80211_sub_if_data *sdata, *nsdata;
2618 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2619 struct ieee80211_if_init_conf conf;
2620 int res;
2621
2622 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2623 read_lock(&local->sub_if_lock);
2624 list_for_each_entry(nsdata, &local->sub_if_list, list) {
2625 struct net_device *ndev = nsdata->dev;
2626
2627 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
2628 compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
2629 !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
2630 read_unlock(&local->sub_if_lock);
2631 return -ENOTUNIQ;
2632 }
2633 }
2634 read_unlock(&local->sub_if_lock);
2635
2636 if (sdata->type == IEEE80211_IF_TYPE_WDS &&
2637 is_zero_ether_addr(sdata->u.wds.remote_addr))
2638 return -ENOLINK;
2639
2640 if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
2641 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2642 /* run the interface in a "soft monitor" mode */
2643 local->monitors++;
2644 local->open_count++;
2645 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2646 return 0;
2647 }
2648 ieee80211_start_soft_monitor(local);
2649
2650 conf.if_id = dev->ifindex;
2651 conf.type = sdata->type;
2652 conf.mac_addr = dev->dev_addr;
2653 res = local->ops->add_interface(local_to_hw(local), &conf);
2654 if (res) {
2655 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
2656 ieee80211_start_hard_monitor(local);
2657 return res;
2658 }
2659
2660 if (local->open_count == 0) {
2661 res = 0;
2662 tasklet_enable(&local->tx_pending_tasklet);
2663 tasklet_enable(&local->tasklet);
2664 if (local->ops->open)
2665 res = local->ops->open(local_to_hw(local));
2666 if (res == 0) {
2667 res = dev_open(local->mdev);
2668 if (res) {
2669 if (local->ops->stop)
2670 local->ops->stop(local_to_hw(local));
2671 } else {
2672 res = ieee80211_hw_config(local);
2673 if (res && local->ops->stop)
2674 local->ops->stop(local_to_hw(local));
2675 else if (!res && local->apdev)
2676 dev_open(local->apdev);
2677 }
2678 }
2679 if (res) {
2680 if (local->ops->remove_interface)
2681 local->ops->remove_interface(local_to_hw(local),
2682 &conf);
2683 return res;
2684 }
2685 }
2686 local->open_count++;
2687
2688 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2689 local->monitors++;
2690 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2691 } else
2692 ieee80211_if_config(dev);
2693
2694 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2695 !local->user_space_mlme)
2696 netif_carrier_off(dev);
2697 else
2698 netif_carrier_on(dev);
2699
2700 netif_start_queue(dev);
2701 return 0;
2702 }
2703
2704
2705 static int ieee80211_stop(struct net_device *dev)
2706 {
2707 struct ieee80211_sub_if_data *sdata;
2708 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2709
2710 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2711
2712 if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
2713 local->open_count > 1 &&
2714 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2715 /* remove "soft monitor" interface */
2716 local->open_count--;
2717 local->monitors--;
2718 if (!local->monitors)
2719 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2720 return 0;
2721 }
2722
2723 netif_stop_queue(dev);
2724 ieee80211_if_shutdown(dev);
2725
2726 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2727 local->monitors--;
2728 if (!local->monitors)
2729 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2730 }
2731
2732 local->open_count--;
2733 if (local->open_count == 0) {
2734 if (netif_running(local->mdev))
2735 dev_close(local->mdev);
2736 if (local->apdev)
2737 dev_close(local->apdev);
2738 if (local->ops->stop)
2739 local->ops->stop(local_to_hw(local));
2740 tasklet_disable(&local->tx_pending_tasklet);
2741 tasklet_disable(&local->tasklet);
2742 }
2743 if (local->ops->remove_interface) {
2744 struct ieee80211_if_init_conf conf;
2745
2746 conf.if_id = dev->ifindex;
2747 conf.type = sdata->type;
2748 conf.mac_addr = dev->dev_addr;
2749 local->ops->remove_interface(local_to_hw(local), &conf);
2750 }
2751
2752 ieee80211_start_hard_monitor(local);
2753
2754 return 0;
2755 }
2756
2757
2758 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
2759 {
2760 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
2761 return ETH_ALEN;
2762 }
2763
2764 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
2765 {
2766 return compare_ether_addr(raddr, addr) == 0 ||
2767 is_broadcast_ether_addr(raddr);
2768 }
2769
2770
2771 static ieee80211_txrx_result
2772 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
2773 {
2774 struct net_device *dev = rx->dev;
2775 struct ieee80211_local *local = rx->local;
2776 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
2777 u16 fc, hdrlen, ethertype;
2778 u8 *payload;
2779 u8 dst[ETH_ALEN];
2780 u8 src[ETH_ALEN];
2781 struct sk_buff *skb = rx->skb, *skb2;
2782 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2783
2784 fc = rx->fc;
2785 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
2786 return TXRX_CONTINUE;
2787
2788 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
2789 return TXRX_DROP;
2790
2791 hdrlen = ieee80211_get_hdrlen(fc);
2792
2793 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
2794 * header
2795 * IEEE 802.11 address fields:
2796 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
2797 * 0 0 DA SA BSSID n/a
2798 * 0 1 DA BSSID SA n/a
2799 * 1 0 BSSID SA DA n/a
2800 * 1 1 RA TA DA SA
2801 */
2802
2803 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
2804 case IEEE80211_FCTL_TODS:
2805 /* BSSID SA DA */
2806 memcpy(dst, hdr->addr3, ETH_ALEN);
2807 memcpy(src, hdr->addr2, ETH_ALEN);
2808
2809 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
2810 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
2811 printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
2812 MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
2813 dev->name, MAC_ARG(hdr->addr1),
2814 MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
2815 return TXRX_DROP;
2816 }
2817 break;
2818 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
2819 /* RA TA DA SA */
2820 memcpy(dst, hdr->addr3, ETH_ALEN);
2821 memcpy(src, hdr->addr4, ETH_ALEN);
2822
2823 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
2824 printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
2825 MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
2826 MAC_FMT ")\n",
2827 rx->dev->name, MAC_ARG(hdr->addr1),
2828 MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
2829 MAC_ARG(hdr->addr4));
2830 return TXRX_DROP;
2831 }
2832 break;
2833 case IEEE80211_FCTL_FROMDS:
2834 /* DA BSSID SA */
2835 memcpy(dst, hdr->addr1, ETH_ALEN);
2836 memcpy(src, hdr->addr3, ETH_ALEN);
2837
2838 if (sdata->type != IEEE80211_IF_TYPE_STA) {
2839 return TXRX_DROP;
2840 }
2841 break;
2842 case 0:
2843 /* DA SA BSSID */
2844 memcpy(dst, hdr->addr1, ETH_ALEN);
2845 memcpy(src, hdr->addr2, ETH_ALEN);
2846
2847 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
2848 if (net_ratelimit()) {
2849 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
2850 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
2851 ")\n",
2852 dev->name, MAC_ARG(hdr->addr1),
2853 MAC_ARG(hdr->addr2),
2854 MAC_ARG(hdr->addr3));
2855 }
2856 return TXRX_DROP;
2857 }
2858 break;
2859 }
2860
2861 payload = skb->data + hdrlen;
2862
2863 if (unlikely(skb->len - hdrlen < 8)) {
2864 if (net_ratelimit()) {
2865 printk(KERN_DEBUG "%s: RX too short data frame "
2866 "payload\n", dev->name);
2867 }
2868 return TXRX_DROP;
2869 }
2870
2871 ethertype = (payload[6] << 8) | payload[7];
2872
2873 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
2874 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
2875 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
2876 /* remove RFC1042 or Bridge-Tunnel encapsulation and
2877 * replace EtherType */
2878 skb_pull(skb, hdrlen + 6);
2879 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
2880 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
2881 } else {
2882 struct ethhdr *ehdr;
2883 __be16 len;
2884 skb_pull(skb, hdrlen);
2885 len = htons(skb->len);
2886 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
2887 memcpy(ehdr->h_dest, dst, ETH_ALEN);
2888 memcpy(ehdr->h_source, src, ETH_ALEN);
2889 ehdr->h_proto = len;
2890 }
2891 skb->dev = dev;
2892
2893 skb2 = NULL;
2894
2895 sdata->stats.rx_packets++;
2896 sdata->stats.rx_bytes += skb->len;
2897
2898 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
2899 || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
2900 if (is_multicast_ether_addr(skb->data)) {
2901 /* send multicast frames both to higher layers in
2902 * local net stack and back to the wireless media */
2903 skb2 = skb_copy(skb, GFP_ATOMIC);
2904 if (!skb2)
2905 printk(KERN_DEBUG "%s: failed to clone "
2906 "multicast frame\n", dev->name);
2907 } else {
2908 struct sta_info *dsta;
2909 dsta = sta_info_get(local, skb->data);
2910 if (dsta && !dsta->dev) {
2911 printk(KERN_DEBUG "Station with null dev "
2912 "structure!\n");
2913 } else if (dsta && dsta->dev == dev) {
2914 /* Destination station is associated to this
2915 * AP, so send the frame directly to it and
2916 * do not pass the frame to local net stack.
2917 */
2918 skb2 = skb;
2919 skb = NULL;
2920 }
2921 if (dsta)
2922 sta_info_put(dsta);
2923 }
2924 }
2925
2926 if (skb) {
2927 /* deliver to local stack */
2928 skb->protocol = eth_type_trans(skb, dev);
2929 memset(skb->cb, 0, sizeof(skb->cb));
2930 netif_rx(skb);
2931 }
2932
2933 if (skb2) {
2934 /* send to wireless media */
2935 skb2->protocol = __constant_htons(ETH_P_802_3);
2936 skb_set_network_header(skb2, 0);
2937 skb_set_mac_header(skb2, 0);
2938 dev_queue_xmit(skb2);
2939 }
2940
2941 return TXRX_QUEUED;
2942 }
2943
2944
2945 static struct ieee80211_rate *
2946 ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
2947 {
2948 struct ieee80211_hw_mode *mode;
2949 int r;
2950
2951 list_for_each_entry(mode, &local->modes_list, list) {
2952 if (mode->mode != phymode)
2953 continue;
2954 for (r = 0; r < mode->num_rates; r++) {
2955 struct ieee80211_rate *rate = &mode->rates[r];
2956 if (rate->val == hw_rate ||
2957 (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
2958 rate->val2 == hw_rate))
2959 return rate;
2960 }
2961 }
2962
2963 return NULL;
2964 }
2965
2966 static void
2967 ieee80211_fill_frame_info(struct ieee80211_local *local,
2968 struct ieee80211_frame_info *fi,
2969 struct ieee80211_rx_status *status)
2970 {
2971 if (status) {
2972 struct timespec ts;
2973 struct ieee80211_rate *rate;
2974
2975 jiffies_to_timespec(jiffies, &ts);
2976 fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
2977 ts.tv_nsec / 1000);
2978 fi->mactime = cpu_to_be64(status->mactime);
2979 switch (status->phymode) {
2980 case MODE_IEEE80211A:
2981 fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
2982 break;
2983 case MODE_IEEE80211B:
2984 fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
2985 break;
2986 case MODE_IEEE80211G:
2987 fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
2988 break;
2989 case MODE_ATHEROS_TURBO:
2990 fi->phytype =
2991 htonl(ieee80211_phytype_dsss_dot11_turbo);
2992 break;
2993 default:
2994 fi->phytype = htonl(0xAAAAAAAA);
2995 break;
2996 }
2997 fi->channel = htonl(status->channel);
2998 rate = ieee80211_get_rate(local, status->phymode,
2999 status->rate);
3000 if (rate) {
3001 fi->datarate = htonl(rate->rate);
3002 if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
3003 if (status->rate == rate->val)
3004 fi->preamble = htonl(2); /* long */
3005 else if (status->rate == rate->val2)
3006 fi->preamble = htonl(1); /* short */
3007 } else
3008 fi->preamble = htonl(0);
3009 } else {
3010 fi->datarate = htonl(0);
3011 fi->preamble = htonl(0);
3012 }
3013
3014 fi->antenna = htonl(status->antenna);
3015 fi->priority = htonl(0xffffffff); /* no clue */
3016 fi->ssi_type = htonl(ieee80211_ssi_raw);
3017 fi->ssi_signal = htonl(status->ssi);
3018 fi->ssi_noise = 0x00000000;
3019 fi->encoding = 0;
3020 } else {
3021 /* clear everything because we really don't know.
3022 * the msg_type field isn't present on monitor frames
3023 * so we don't know whether it will be present or not,
3024 * but it's ok to not clear it since it'll be assigned
3025 * anyway */
3026 memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
3027
3028 fi->ssi_type = htonl(ieee80211_ssi_none);
3029 }
3030 fi->version = htonl(IEEE80211_FI_VERSION);
3031 fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
3032 }
3033
3034 /* this routine is actually not just for this, but also
3035 * for pushing fake 'management' frames into userspace.
3036 * it shall be replaced by a netlink-based system. */
3037 void
3038 ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
3039 struct ieee80211_rx_status *status, u32 msg_type)
3040 {
3041 struct ieee80211_frame_info *fi;
3042 const size_t hlen = sizeof(struct ieee80211_frame_info);
3043 struct ieee80211_sub_if_data *sdata;
3044
3045 skb->dev = local->apdev;
3046
3047 sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
3048
3049 if (skb_headroom(skb) < hlen) {
3050 I802_DEBUG_INC(local->rx_expand_skb_head);
3051 if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
3052 dev_kfree_skb(skb);
3053 return;
3054 }
3055 }
3056
3057 fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
3058
3059 ieee80211_fill_frame_info(local, fi, status);
3060 fi->msg_type = htonl(msg_type);
3061
3062 sdata->stats.rx_packets++;
3063 sdata->stats.rx_bytes += skb->len;
3064
3065 skb_set_mac_header(skb, 0);
3066 skb->ip_summed = CHECKSUM_UNNECESSARY;
3067 skb->pkt_type = PACKET_OTHERHOST;
3068 skb->protocol = htons(ETH_P_802_2);
3069 memset(skb->cb, 0, sizeof(skb->cb));
3070 netif_rx(skb);
3071 }
3072
3073 static void
3074 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
3075 struct ieee80211_rx_status *status)
3076 {
3077 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3078 struct ieee80211_sub_if_data *sdata;
3079 struct ieee80211_rate *rate;
3080 struct ieee80211_rtap_hdr {
3081 struct ieee80211_radiotap_header hdr;
3082 u8 flags;
3083 u8 rate;
3084 __le16 chan_freq;
3085 __le16 chan_flags;
3086 u8 antsignal;
3087 } __attribute__ ((packed)) *rthdr;
3088
3089 skb->dev = dev;
3090
3091 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3092
3093 if (status->flag & RX_FLAG_RADIOTAP)
3094 goto out;
3095
3096 if (skb_headroom(skb) < sizeof(*rthdr)) {
3097 I802_DEBUG_INC(local->rx_expand_skb_head);
3098 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
3099 dev_kfree_skb(skb);
3100 return;
3101 }
3102 }
3103
3104 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
3105 memset(rthdr, 0, sizeof(*rthdr));
3106 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
3107 rthdr->hdr.it_present =
3108 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3109 (1 << IEEE80211_RADIOTAP_RATE) |
3110 (1 << IEEE80211_RADIOTAP_CHANNEL) |
3111 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
3112 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
3113 IEEE80211_RADIOTAP_F_FCS : 0;
3114 rate = ieee80211_get_rate(local, status->phymode, status->rate);
3115 if (rate)
3116 rthdr->rate = rate->rate / 5;
3117 rthdr->chan_freq = cpu_to_le16(status->freq);
3118 rthdr->chan_flags =
3119 status->phymode == MODE_IEEE80211A ?
3120 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
3121 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
3122 rthdr->antsignal = status->ssi;
3123
3124 out:
3125 sdata->stats.rx_packets++;
3126 sdata->stats.rx_bytes += skb->len;
3127
3128 skb_set_mac_header(skb, 0);
3129 skb->ip_summed = CHECKSUM_UNNECESSARY;
3130 skb->pkt_type = PACKET_OTHERHOST;
3131 skb->protocol = htons(ETH_P_802_2);
3132 memset(skb->cb, 0, sizeof(skb->cb));
3133 netif_rx(skb);
3134 }
3135
3136 int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
3137 int radar, int radar_type)
3138 {
3139 struct sk_buff *skb;
3140 struct ieee80211_radar_info *msg;
3141 struct ieee80211_local *local = hw_to_local(hw);
3142
3143 if (!local->apdev)
3144 return 0;
3145
3146 skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
3147 sizeof(struct ieee80211_radar_info));
3148
3149 if (!skb)
3150 return -ENOMEM;
3151 skb_reserve(skb, sizeof(struct ieee80211_frame_info));
3152
3153 msg = (struct ieee80211_radar_info *)
3154 skb_put(skb, sizeof(struct ieee80211_radar_info));
3155 msg->channel = channel;
3156 msg->radar = radar;
3157 msg->radar_type = radar_type;
3158
3159 ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
3160 return 0;
3161 }
3162 EXPORT_SYMBOL(ieee80211_radar_status);
3163
3164
3165 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
3166 {
3167 struct ieee80211_sub_if_data *sdata;
3168 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3169
3170 if (sdata->bss)
3171 atomic_inc(&sdata->bss->num_sta_ps);
3172 sta->flags |= WLAN_STA_PS;
3173 sta->pspoll = 0;
3174 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3175 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
3176 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3177 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3178 }
3179
3180
3181 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
3182 {
3183 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3184 struct sk_buff *skb;
3185 int sent = 0;
3186 struct ieee80211_sub_if_data *sdata;
3187 struct ieee80211_tx_packet_data *pkt_data;
3188
3189 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3190 if (sdata->bss)
3191 atomic_dec(&sdata->bss->num_sta_ps);
3192 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
3193 sta->pspoll = 0;
3194 if (!skb_queue_empty(&sta->ps_tx_buf)) {
3195 if (local->ops->set_tim)
3196 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
3197 if (sdata->bss)
3198 bss_tim_clear(local, sdata->bss, sta->aid);
3199 }
3200 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3201 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
3202 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3203 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3204 /* Send all buffered frames to the station */
3205 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
3206 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3207 sent++;
3208 pkt_data->requeue = 1;
3209 dev_queue_xmit(skb);
3210 }
3211 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
3212 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3213 local->total_ps_buffered--;
3214 sent++;
3215 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3216 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
3217 "since STA not sleeping anymore\n", dev->name,
3218 MAC_ARG(sta->addr), sta->aid);
3219 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3220 pkt_data->requeue = 1;
3221 dev_queue_xmit(skb);
3222 }
3223
3224 return sent;
3225 }
3226
3227
3228 static ieee80211_txrx_result
3229 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
3230 {
3231 struct sk_buff *skb;
3232 int no_pending_pkts;
3233
3234 if (likely(!rx->sta ||
3235 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
3236 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
3237 !rx->u.rx.ra_match))
3238 return TXRX_CONTINUE;
3239
3240 skb = skb_dequeue(&rx->sta->tx_filtered);
3241 if (!skb) {
3242 skb = skb_dequeue(&rx->sta->ps_tx_buf);
3243 if (skb)
3244 rx->local->total_ps_buffered--;
3245 }
3246 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
3247 skb_queue_empty(&rx->sta->ps_tx_buf);
3248
3249 if (skb) {
3250 struct ieee80211_hdr *hdr =
3251 (struct ieee80211_hdr *) skb->data;
3252
3253 /* tell TX path to send one frame even though the STA may
3254 * still remain is PS mode after this frame exchange */
3255 rx->sta->pspoll = 1;
3256
3257 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3258 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
3259 "after %d)\n",
3260 MAC_ARG(rx->sta->addr), rx->sta->aid,
3261 skb_queue_len(&rx->sta->ps_tx_buf));
3262 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3263
3264 /* Use MoreData flag to indicate whether there are more
3265 * buffered frames for this STA */
3266 if (no_pending_pkts) {
3267 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
3268 rx->sta->flags &= ~WLAN_STA_TIM;
3269 } else
3270 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3271
3272 dev_queue_xmit(skb);
3273
3274 if (no_pending_pkts) {
3275 if (rx->local->ops->set_tim)
3276 rx->local->ops->set_tim(local_to_hw(rx->local),
3277 rx->sta->aid, 0);
3278 if (rx->sdata->bss)
3279 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
3280 }
3281 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3282 } else if (!rx->u.rx.sent_ps_buffered) {
3283 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
3284 "though there is no buffered frames for it\n",
3285 rx->dev->name, MAC_ARG(rx->sta->addr));
3286 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3287
3288 }
3289
3290 /* Free PS Poll skb here instead of returning TXRX_DROP that would
3291 * count as an dropped frame. */
3292 dev_kfree_skb(rx->skb);
3293
3294 return TXRX_QUEUED;
3295 }
3296
3297
3298 static inline struct ieee80211_fragment_entry *
3299 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
3300 unsigned int frag, unsigned int seq, int rx_queue,
3301 struct sk_buff **skb)
3302 {
3303 struct ieee80211_fragment_entry *entry;
3304 int idx;
3305
3306 idx = sdata->fragment_next;
3307 entry = &sdata->fragments[sdata->fragment_next++];
3308 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
3309 sdata->fragment_next = 0;
3310
3311 if (!skb_queue_empty(&entry->skb_list)) {
3312 #ifdef CONFIG_MAC80211_DEBUG
3313 struct ieee80211_hdr *hdr =
3314 (struct ieee80211_hdr *) entry->skb_list.next->data;
3315 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
3316 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
3317 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
3318 sdata->dev->name, idx,
3319 jiffies - entry->first_frag_time, entry->seq,
3320 entry->last_frag, MAC_ARG(hdr->addr1),
3321 MAC_ARG(hdr->addr2));
3322 #endif /* CONFIG_MAC80211_DEBUG */
3323 __skb_queue_purge(&entry->skb_list);
3324 }
3325
3326 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
3327 *skb = NULL;
3328 entry->first_frag_time = jiffies;
3329 entry->seq = seq;
3330 entry->rx_queue = rx_queue;
3331 entry->last_frag = frag;
3332 entry->ccmp = 0;
3333 entry->extra_len = 0;
3334
3335 return entry;
3336 }
3337
3338
3339 static inline struct ieee80211_fragment_entry *
3340 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
3341 u16 fc, unsigned int frag, unsigned int seq,
3342 int rx_queue, struct ieee80211_hdr *hdr)
3343 {
3344 struct ieee80211_fragment_entry *entry;
3345 int i, idx;
3346
3347 idx = sdata->fragment_next;
3348 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
3349 struct ieee80211_hdr *f_hdr;
3350 u16 f_fc;
3351
3352 idx--;
3353 if (idx < 0)
3354 idx = IEEE80211_FRAGMENT_MAX - 1;
3355
3356 entry = &sdata->fragments[idx];
3357 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
3358 entry->rx_queue != rx_queue ||
3359 entry->last_frag + 1 != frag)
3360 continue;
3361
3362 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
3363 f_fc = le16_to_cpu(f_hdr->frame_control);
3364
3365 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
3366 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
3367 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
3368 continue;
3369
3370 if (entry->first_frag_time + 2 * HZ < jiffies) {
3371 __skb_queue_purge(&entry->skb_list);
3372 continue;
3373 }
3374 return entry;
3375 }
3376
3377 return NULL;
3378 }
3379
3380
3381 static ieee80211_txrx_result
3382 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
3383 {
3384 struct ieee80211_hdr *hdr;
3385 u16 sc;
3386 unsigned int frag, seq;
3387 struct ieee80211_fragment_entry *entry;
3388 struct sk_buff *skb;
3389
3390 hdr = (struct ieee80211_hdr *) rx->skb->data;
3391 sc = le16_to_cpu(hdr->seq_ctrl);
3392 frag = sc & IEEE80211_SCTL_FRAG;
3393
3394 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
3395 (rx->skb)->len < 24 ||
3396 is_multicast_ether_addr(hdr->addr1))) {
3397 /* not fragmented */
3398 goto out;
3399 }
3400 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
3401
3402 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
3403
3404 if (frag == 0) {
3405 /* This is the first fragment of a new frame. */
3406 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
3407 rx->u.rx.queue, &(rx->skb));
3408 if (rx->key && rx->key->alg == ALG_CCMP &&
3409 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
3410 /* Store CCMP PN so that we can verify that the next
3411 * fragment has a sequential PN value. */
3412 entry->ccmp = 1;
3413 memcpy(entry->last_pn,
3414 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
3415 CCMP_PN_LEN);
3416 }
3417 return TXRX_QUEUED;
3418 }
3419
3420 /* This is a fragment for a frame that should already be pending in
3421 * fragment cache. Add this fragment to the end of the pending entry.
3422 */
3423 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
3424 rx->u.rx.queue, hdr);
3425 if (!entry) {
3426 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3427 return TXRX_DROP;
3428 }
3429
3430 /* Verify that MPDUs within one MSDU have sequential PN values.
3431 * (IEEE 802.11i, 8.3.3.4.5) */
3432 if (entry->ccmp) {
3433 int i;
3434 u8 pn[CCMP_PN_LEN], *rpn;
3435 if (!rx->key || rx->key->alg != ALG_CCMP)
3436 return TXRX_DROP;
3437 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
3438 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
3439 pn[i]++;
3440 if (pn[i])
3441 break;
3442 }
3443 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
3444 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
3445 printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
3446 " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
3447 "(expected %02x%02x%02x%02x%02x%02x)\n",
3448 rx->dev->name, MAC_ARG(hdr->addr2),
3449 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
3450 pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
3451 return TXRX_DROP;
3452 }
3453 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
3454 }
3455
3456 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
3457 __skb_queue_tail(&entry->skb_list, rx->skb);
3458 entry->last_frag = frag;
3459 entry->extra_len += rx->skb->len;
3460 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
3461 rx->skb = NULL;
3462 return TXRX_QUEUED;
3463 }
3464
3465 rx->skb = __skb_dequeue(&entry->skb_list);
3466 if (skb_tailroom(rx->skb) < entry->extra_len) {
3467 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
3468 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
3469 GFP_ATOMIC))) {
3470 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3471 __skb_queue_purge(&entry->skb_list);
3472 return TXRX_DROP;
3473 }
3474 }
3475 while ((skb = __skb_dequeue(&entry->skb_list))) {
3476 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
3477 dev_kfree_skb(skb);
3478 }
3479
3480 /* Complete frame has been reassembled - process it now */
3481 rx->fragmented = 1;
3482
3483 out:
3484 if (rx->sta)
3485 rx->sta->rx_packets++;
3486 if (is_multicast_ether_addr(hdr->addr1))
3487 rx->local->dot11MulticastReceivedFrameCount++;
3488 else
3489 ieee80211_led_rx(rx->local);
3490 return TXRX_CONTINUE;
3491 }
3492
3493
3494 static ieee80211_txrx_result
3495 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
3496 {
3497 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
3498 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
3499 return TXRX_QUEUED;
3500 }
3501
3502 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
3503 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb));
3504
3505 return TXRX_CONTINUE;
3506 }
3507
3508
3509 static ieee80211_txrx_result
3510 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
3511 {
3512 struct ieee80211_hdr *hdr;
3513 int always_sta_key;
3514 hdr = (struct ieee80211_hdr *) rx->skb->data;
3515
3516 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
3517 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
3518 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
3519 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
3520 hdr->seq_ctrl)) {
3521 if (rx->u.rx.ra_match) {
3522 rx->local->dot11FrameDuplicateCount++;
3523 rx->sta->num_duplicates++;
3524 }
3525 return TXRX_DROP;
3526 } else
3527 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
3528 }
3529
3530 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
3531 rx->skb->len > FCS_LEN)
3532 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
3533
3534 if (unlikely(rx->skb->len < 16)) {
3535 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
3536 return TXRX_DROP;
3537 }
3538
3539 if (!rx->u.rx.ra_match)
3540 rx->skb->pkt_type = PACKET_OTHERHOST;
3541 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
3542 rx->skb->pkt_type = PACKET_HOST;
3543 else if (is_multicast_ether_addr(hdr->addr1)) {
3544 if (is_broadcast_ether_addr(hdr->addr1))
3545 rx->skb->pkt_type = PACKET_BROADCAST;
3546 else
3547 rx->skb->pkt_type = PACKET_MULTICAST;
3548 } else
3549 rx->skb->pkt_type = PACKET_OTHERHOST;
3550
3551 /* Drop disallowed frame classes based on STA auth/assoc state;
3552 * IEEE 802.11, Chap 5.5.
3553 *
3554 * 80211.o does filtering only based on association state, i.e., it
3555 * drops Class 3 frames from not associated stations. hostapd sends
3556 * deauth/disassoc frames when needed. In addition, hostapd is
3557 * responsible for filtering on both auth and assoc states.
3558 */
3559 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
3560 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
3561 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
3562 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
3563 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
3564 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
3565 !(rx->fc & IEEE80211_FCTL_TODS) &&
3566 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
3567 || !rx->u.rx.ra_match) {
3568 /* Drop IBSS frames and frames for other hosts
3569 * silently. */
3570 return TXRX_DROP;
3571 }
3572
3573 if (!rx->local->apdev)
3574 return TXRX_DROP;
3575
3576 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3577 ieee80211_msg_sta_not_assoc);
3578 return TXRX_QUEUED;
3579 }
3580
3581 if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
3582 always_sta_key = 0;
3583 else
3584 always_sta_key = 1;
3585
3586 if (rx->sta && rx->sta->key && always_sta_key) {
3587 rx->key = rx->sta->key;
3588 } else {
3589 if (rx->sta && rx->sta->key)
3590 rx->key = rx->sta->key;
3591 else
3592 rx->key = rx->sdata->default_key;
3593
3594 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3595 rx->fc & IEEE80211_FCTL_PROTECTED) {
3596 int keyidx = ieee80211_wep_get_keyidx(rx->skb);
3597
3598 if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
3599 (!rx->sta || !rx->sta->key || keyidx > 0))
3600 rx->key = rx->sdata->keys[keyidx];
3601
3602 if (!rx->key) {
3603 if (!rx->u.rx.ra_match)
3604 return TXRX_DROP;
3605 printk(KERN_DEBUG "%s: RX WEP frame with "
3606 "unknown keyidx %d (A1=" MAC_FMT " A2="
3607 MAC_FMT " A3=" MAC_FMT ")\n",
3608 rx->dev->name, keyidx,
3609 MAC_ARG(hdr->addr1),
3610 MAC_ARG(hdr->addr2),
3611 MAC_ARG(hdr->addr3));
3612 if (!rx->local->apdev)
3613 return TXRX_DROP;
3614 ieee80211_rx_mgmt(
3615 rx->local, rx->skb, rx->u.rx.status,
3616 ieee80211_msg_wep_frame_unknown_key);
3617 return TXRX_QUEUED;
3618 }
3619 }
3620 }
3621
3622 if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
3623 rx->key->tx_rx_count++;
3624 if (unlikely(rx->local->key_tx_rx_threshold &&
3625 rx->key->tx_rx_count >
3626 rx->local->key_tx_rx_threshold)) {
3627 ieee80211_key_threshold_notify(rx->dev, rx->key,
3628 rx->sta);
3629 }
3630 }
3631
3632 return TXRX_CONTINUE;
3633 }
3634
3635
3636 static ieee80211_txrx_result
3637 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
3638 {
3639 struct sta_info *sta = rx->sta;
3640 struct net_device *dev = rx->dev;
3641 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3642
3643 if (!sta)
3644 return TXRX_CONTINUE;
3645
3646 /* Update last_rx only for IBSS packets which are for the current
3647 * BSSID to avoid keeping the current IBSS network alive in cases where
3648 * other STAs are using different BSSID. */
3649 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
3650 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
3651 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
3652 sta->last_rx = jiffies;
3653 } else
3654 if (!is_multicast_ether_addr(hdr->addr1) ||
3655 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
3656 /* Update last_rx only for unicast frames in order to prevent
3657 * the Probe Request frames (the only broadcast frames from a
3658 * STA in infrastructure mode) from keeping a connection alive.
3659 */
3660 sta->last_rx = jiffies;
3661 }
3662
3663 if (!rx->u.rx.ra_match)
3664 return TXRX_CONTINUE;
3665
3666 sta->rx_fragments++;
3667 sta->rx_bytes += rx->skb->len;
3668 sta->last_rssi = (sta->last_rssi * 15 +
3669 rx->u.rx.status->ssi) / 16;
3670 sta->last_signal = (sta->last_signal * 15 +
3671 rx->u.rx.status->signal) / 16;
3672 sta->last_noise = (sta->last_noise * 15 +
3673 rx->u.rx.status->noise) / 16;
3674
3675 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
3676 /* Change STA power saving mode only in the end of a frame
3677 * exchange sequence */
3678 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
3679 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
3680 else if (!(sta->flags & WLAN_STA_PS) &&
3681 (rx->fc & IEEE80211_FCTL_PM))
3682 ap_sta_ps_start(dev, sta);
3683 }
3684
3685 /* Drop data::nullfunc frames silently, since they are used only to
3686 * control station power saving mode. */
3687 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3688 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
3689 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
3690 /* Update counter and free packet here to avoid counting this
3691 * as a dropped packed. */
3692 sta->rx_packets++;
3693 dev_kfree_skb(rx->skb);
3694 return TXRX_QUEUED;
3695 }
3696
3697 return TXRX_CONTINUE;
3698 } /* ieee80211_rx_h_sta_process */
3699
3700
3701 static ieee80211_txrx_result
3702 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
3703 {
3704 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3705 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
3706 !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
3707 return TXRX_CONTINUE;
3708
3709 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
3710 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
3711 rx->key->force_sw_encrypt) {
3712 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
3713 if (iv) {
3714 rx->sta->wep_weak_iv_count++;
3715 }
3716 }
3717
3718 return TXRX_CONTINUE;
3719 }
3720
3721
3722 static ieee80211_txrx_result
3723 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
3724 {
3725 /* If the device handles decryption totally, skip this test */
3726 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3727 return TXRX_CONTINUE;
3728
3729 if ((rx->key && rx->key->alg != ALG_WEP) ||
3730 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3731 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3732 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3733 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
3734 return TXRX_CONTINUE;
3735
3736 if (!rx->key) {
3737 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
3738 rx->dev->name);
3739 return TXRX_DROP;
3740 }
3741
3742 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
3743 rx->key->force_sw_encrypt) {
3744 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
3745 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
3746 "failed\n", rx->dev->name);
3747 return TXRX_DROP;
3748 }
3749 } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
3750 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
3751 /* remove ICV */
3752 skb_trim(rx->skb, rx->skb->len - 4);
3753 }
3754
3755 return TXRX_CONTINUE;
3756 }
3757
3758
3759 static ieee80211_txrx_result
3760 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
3761 {
3762 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
3763 rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
3764 /* Pass both encrypted and unencrypted EAPOL frames to user
3765 * space for processing. */
3766 if (!rx->local->apdev)
3767 return TXRX_DROP;
3768 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3769 ieee80211_msg_normal);
3770 return TXRX_QUEUED;
3771 }
3772
3773 if (unlikely(rx->sdata->ieee802_1x &&
3774 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3775 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3776 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
3777 !ieee80211_is_eapol(rx->skb))) {
3778 #ifdef CONFIG_MAC80211_DEBUG
3779 struct ieee80211_hdr *hdr =
3780 (struct ieee80211_hdr *) rx->skb->data;
3781 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
3782 " (unauthorized port)\n", rx->dev->name,
3783 MAC_ARG(hdr->addr2));
3784 #endif /* CONFIG_MAC80211_DEBUG */
3785 return TXRX_DROP;
3786 }
3787
3788 return TXRX_CONTINUE;
3789 }
3790
3791
3792 static ieee80211_txrx_result
3793 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
3794 {
3795 /* If the device handles decryption totally, skip this test */
3796 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3797 return TXRX_CONTINUE;
3798
3799 /* Drop unencrypted frames if key is set. */
3800 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
3801 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3802 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3803 (rx->key || rx->sdata->drop_unencrypted) &&
3804 (rx->sdata->eapol == 0 ||
3805 !ieee80211_is_eapol(rx->skb)))) {
3806 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
3807 "encryption\n", rx->dev->name);
3808 return TXRX_DROP;
3809 }
3810 return TXRX_CONTINUE;
3811 }
3812
3813
3814 static ieee80211_txrx_result
3815 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
3816 {
3817 struct ieee80211_sub_if_data *sdata;
3818
3819 if (!rx->u.rx.ra_match)
3820 return TXRX_DROP;
3821
3822 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
3823 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
3824 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
3825 !rx->local->user_space_mlme) {
3826 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
3827 } else {
3828 /* Management frames are sent to hostapd for processing */
3829 if (!rx->local->apdev)
3830 return TXRX_DROP;
3831 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3832 ieee80211_msg_normal);
3833 }
3834 return TXRX_QUEUED;
3835 }
3836
3837
3838 static ieee80211_txrx_result
3839 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
3840 {
3841 struct ieee80211_local *local = rx->local;
3842 struct sk_buff *skb = rx->skb;
3843
3844 if (unlikely(local->sta_scanning != 0)) {
3845 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
3846 return TXRX_QUEUED;
3847 }
3848
3849 if (unlikely(rx->u.rx.in_scan)) {
3850 /* scanning finished during invoking of handlers */
3851 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
3852 return TXRX_DROP;
3853 }
3854
3855 return TXRX_CONTINUE;
3856 }
3857
3858
3859 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
3860 struct ieee80211_hdr *hdr,
3861 struct sta_info *sta,
3862 struct ieee80211_txrx_data *rx)
3863 {
3864 int keyidx, hdrlen;
3865
3866 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
3867 if (rx->skb->len >= hdrlen + 4)
3868 keyidx = rx->skb->data[hdrlen + 3] >> 6;
3869 else
3870 keyidx = -1;
3871
3872 /* TODO: verify that this is not triggered by fragmented
3873 * frames (hw does not verify MIC for them). */
3874 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
3875 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
3876 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
3877
3878 if (!sta) {
3879 /* Some hardware versions seem to generate incorrect
3880 * Michael MIC reports; ignore them to avoid triggering
3881 * countermeasures. */
3882 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3883 "error for unknown address " MAC_FMT "\n",
3884 dev->name, MAC_ARG(hdr->addr2));
3885 goto ignore;
3886 }
3887
3888 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
3889 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3890 "error for a frame with no ISWEP flag (src "
3891 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
3892 goto ignore;
3893 }
3894
3895 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3896 rx->sdata->type == IEEE80211_IF_TYPE_AP) {
3897 keyidx = ieee80211_wep_get_keyidx(rx->skb);
3898 /* AP with Pairwise keys support should never receive Michael
3899 * MIC errors for non-zero keyidx because these are reserved
3900 * for group keys and only the AP is sending real multicast
3901 * frames in BSS. */
3902 if (keyidx) {
3903 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
3904 "a frame with non-zero keyidx (%d) (src " MAC_FMT
3905 ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
3906 goto ignore;
3907 }
3908 }
3909
3910 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3911 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3912 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
3913 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3914 "error for a frame that cannot be encrypted "
3915 "(fc=0x%04x) (src " MAC_FMT ")\n",
3916 dev->name, rx->fc, MAC_ARG(hdr->addr2));
3917 goto ignore;
3918 }
3919
3920 do {
3921 union iwreq_data wrqu;
3922 char *buf = kmalloc(128, GFP_ATOMIC);
3923 if (!buf)
3924 break;
3925
3926 /* TODO: needed parameters: count, key type, TSC */
3927 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
3928 "keyid=%d %scast addr=" MAC_FMT ")",
3929 keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
3930 MAC_ARG(hdr->addr2));
3931 memset(&wrqu, 0, sizeof(wrqu));
3932 wrqu.data.length = strlen(buf);
3933 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
3934 kfree(buf);
3935 } while (0);
3936
3937 /* TODO: consider verifying the MIC error report with software
3938 * implementation if we get too many spurious reports from the
3939 * hardware. */
3940 if (!rx->local->apdev)
3941 goto ignore;
3942 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3943 ieee80211_msg_michael_mic_failure);
3944 return;
3945
3946 ignore:
3947 dev_kfree_skb(rx->skb);
3948 rx->skb = NULL;
3949 }
3950
3951 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
3952 struct ieee80211_local *local,
3953 ieee80211_rx_handler *handlers,
3954 struct ieee80211_txrx_data *rx,
3955 struct sta_info *sta)
3956 {
3957 ieee80211_rx_handler *handler;
3958 ieee80211_txrx_result res = TXRX_DROP;
3959
3960 for (handler = handlers; *handler != NULL; handler++) {
3961 res = (*handler)(rx);
3962 if (res != TXRX_CONTINUE) {
3963 if (res == TXRX_DROP) {
3964 I802_DEBUG_INC(local->rx_handlers_drop);
3965 if (sta)
3966 sta->rx_dropped++;
3967 }
3968 if (res == TXRX_QUEUED)
3969 I802_DEBUG_INC(local->rx_handlers_queued);
3970 break;
3971 }
3972 }
3973
3974 if (res == TXRX_DROP) {
3975 dev_kfree_skb(rx->skb);
3976 }
3977 return res;
3978 }
3979
3980 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
3981 ieee80211_rx_handler *handlers,
3982 struct ieee80211_txrx_data *rx,
3983 struct sta_info *sta)
3984 {
3985 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
3986 TXRX_CONTINUE)
3987 dev_kfree_skb(rx->skb);
3988 }
3989
3990 /*
3991 * This is the receive path handler. It is called by a low level driver when an
3992 * 802.11 MPDU is received from the hardware.
3993 */
3994 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
3995 struct ieee80211_rx_status *status)
3996 {
3997 struct ieee80211_local *local = hw_to_local(hw);
3998 struct ieee80211_sub_if_data *sdata;
3999 struct sta_info *sta;
4000 struct ieee80211_hdr *hdr;
4001 struct ieee80211_txrx_data rx;
4002 u16 type;
4003 int multicast;
4004 int radiotap_len = 0;
4005
4006 if (status->flag & RX_FLAG_RADIOTAP) {
4007 radiotap_len = ieee80211_get_radiotap_len(skb);
4008 skb_pull(skb, radiotap_len);
4009 }
4010
4011 hdr = (struct ieee80211_hdr *) skb->data;
4012 memset(&rx, 0, sizeof(rx));
4013 rx.skb = skb;
4014 rx.local = local;
4015
4016 rx.u.rx.status = status;
4017 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
4018 type = rx.fc & IEEE80211_FCTL_FTYPE;
4019 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
4020 local->dot11ReceivedFragmentCount++;
4021 multicast = is_multicast_ether_addr(hdr->addr1);
4022
4023 if (skb->len >= 16)
4024 sta = rx.sta = sta_info_get(local, hdr->addr2);
4025 else
4026 sta = rx.sta = NULL;
4027
4028 if (sta) {
4029 rx.dev = sta->dev;
4030 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
4031 }
4032
4033 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
4034 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
4035 goto end;
4036 }
4037
4038 if (unlikely(local->sta_scanning))
4039 rx.u.rx.in_scan = 1;
4040
4041 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
4042 sta) != TXRX_CONTINUE)
4043 goto end;
4044 skb = rx.skb;
4045
4046 skb_push(skb, radiotap_len);
4047 if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
4048 !local->iff_promiscs && !multicast) {
4049 rx.u.rx.ra_match = 1;
4050 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
4051 sta);
4052 } else {
4053 struct ieee80211_sub_if_data *prev = NULL;
4054 struct sk_buff *skb_new;
4055 u8 *bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
4056
4057 read_lock(&local->sub_if_lock);
4058 list_for_each_entry(sdata, &local->sub_if_list, list) {
4059 rx.u.rx.ra_match = 1;
4060 switch (sdata->type) {
4061 case IEEE80211_IF_TYPE_STA:
4062 if (!bssid)
4063 continue;
4064 if (!ieee80211_bssid_match(bssid,
4065 sdata->u.sta.bssid)) {
4066 if (!rx.u.rx.in_scan)
4067 continue;
4068 rx.u.rx.ra_match = 0;
4069 } else if (!multicast &&
4070 compare_ether_addr(sdata->dev->dev_addr,
4071 hdr->addr1) != 0) {
4072 if (!sdata->promisc)
4073 continue;
4074 rx.u.rx.ra_match = 0;
4075 }
4076 break;
4077 case IEEE80211_IF_TYPE_IBSS:
4078 if (!bssid)
4079 continue;
4080 if (!ieee80211_bssid_match(bssid,
4081 sdata->u.sta.bssid)) {
4082 if (!rx.u.rx.in_scan)
4083 continue;
4084 rx.u.rx.ra_match = 0;
4085 } else if (!multicast &&
4086 compare_ether_addr(sdata->dev->dev_addr,
4087 hdr->addr1) != 0) {
4088 if (!sdata->promisc)
4089 continue;
4090 rx.u.rx.ra_match = 0;
4091 } else if (!sta)
4092 sta = rx.sta =
4093 ieee80211_ibss_add_sta(sdata->dev,
4094 skb, bssid,
4095 hdr->addr2);
4096 break;
4097 case IEEE80211_IF_TYPE_AP:
4098 if (!bssid) {
4099 if (compare_ether_addr(sdata->dev->dev_addr,
4100 hdr->addr1) != 0)
4101 continue;
4102 } else if (!ieee80211_bssid_match(bssid,
4103 sdata->dev->dev_addr)) {
4104 if (!rx.u.rx.in_scan)
4105 continue;
4106 rx.u.rx.ra_match = 0;
4107 }
4108 if (sdata->dev == local->mdev &&
4109 !rx.u.rx.in_scan)
4110 /* do not receive anything via
4111 * master device when not scanning */
4112 continue;
4113 break;
4114 case IEEE80211_IF_TYPE_WDS:
4115 if (bssid ||
4116 (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
4117 continue;
4118 if (compare_ether_addr(sdata->u.wds.remote_addr,
4119 hdr->addr2) != 0)
4120 continue;
4121 break;
4122 }
4123
4124 if (prev) {
4125 skb_new = skb_copy(skb, GFP_ATOMIC);
4126 if (!skb_new) {
4127 if (net_ratelimit())
4128 printk(KERN_DEBUG "%s: failed to copy "
4129 "multicast frame for %s",
4130 local->mdev->name, prev->dev->name);
4131 continue;
4132 }
4133 rx.skb = skb_new;
4134 rx.dev = prev->dev;
4135 rx.sdata = prev;
4136 ieee80211_invoke_rx_handlers(local,
4137 local->rx_handlers,
4138 &rx, sta);
4139 }
4140 prev = sdata;
4141 }
4142 if (prev) {
4143 rx.skb = skb;
4144 rx.dev = prev->dev;
4145 rx.sdata = prev;
4146 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
4147 &rx, sta);
4148 } else
4149 dev_kfree_skb(skb);
4150 read_unlock(&local->sub_if_lock);
4151 }
4152
4153 end:
4154 if (sta)
4155 sta_info_put(sta);
4156 }
4157 EXPORT_SYMBOL(__ieee80211_rx);
4158
4159 static ieee80211_txrx_result
4160 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
4161 {
4162 struct ieee80211_local *local = tx->local;
4163 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
4164 struct sk_buff *skb = tx->skb;
4165 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4166 u32 load = 0, hdrtime;
4167
4168 /* TODO: this could be part of tx_status handling, so that the number
4169 * of retries would be known; TX rate should in that case be stored
4170 * somewhere with the packet */
4171
4172 /* Estimate total channel use caused by this frame */
4173
4174 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4175 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4176
4177 if (mode->mode == MODE_IEEE80211A ||
4178 mode->mode == MODE_ATHEROS_TURBO ||
4179 mode->mode == MODE_ATHEROS_TURBOG ||
4180 (mode->mode == MODE_IEEE80211G &&
4181 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
4182 hdrtime = CHAN_UTIL_HDR_SHORT;
4183 else
4184 hdrtime = CHAN_UTIL_HDR_LONG;
4185
4186 load = hdrtime;
4187 if (!is_multicast_ether_addr(hdr->addr1))
4188 load += hdrtime;
4189
4190 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
4191 load += 2 * hdrtime;
4192 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
4193 load += hdrtime;
4194
4195 load += skb->len * tx->u.tx.rate->rate_inv;
4196
4197 if (tx->u.tx.extra_frag) {
4198 int i;
4199 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
4200 load += 2 * hdrtime;
4201 load += tx->u.tx.extra_frag[i]->len *
4202 tx->u.tx.rate->rate;
4203 }
4204 }
4205
4206 /* Divide channel_use by 8 to avoid wrapping around the counter */
4207 load >>= CHAN_UTIL_SHIFT;
4208 local->channel_use_raw += load;
4209 if (tx->sta)
4210 tx->sta->channel_use_raw += load;
4211 tx->sdata->channel_use_raw += load;
4212
4213 return TXRX_CONTINUE;
4214 }
4215
4216
4217 static ieee80211_txrx_result
4218 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
4219 {
4220 struct ieee80211_local *local = rx->local;
4221 struct sk_buff *skb = rx->skb;
4222 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4223 u32 load = 0, hdrtime;
4224 struct ieee80211_rate *rate;
4225 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
4226 int i;
4227
4228 /* Estimate total channel use caused by this frame */
4229
4230 if (unlikely(mode->num_rates < 0))
4231 return TXRX_CONTINUE;
4232
4233 rate = &mode->rates[0];
4234 for (i = 0; i < mode->num_rates; i++) {
4235 if (mode->rates[i].val == rx->u.rx.status->rate) {
4236 rate = &mode->rates[i];
4237 break;
4238 }
4239 }
4240
4241 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4242 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4243
4244 if (mode->mode == MODE_IEEE80211A ||
4245 mode->mode == MODE_ATHEROS_TURBO ||
4246 mode->mode == MODE_ATHEROS_TURBOG ||
4247 (mode->mode == MODE_IEEE80211G &&
4248 rate->flags & IEEE80211_RATE_ERP))
4249 hdrtime = CHAN_UTIL_HDR_SHORT;
4250 else
4251 hdrtime = CHAN_UTIL_HDR_LONG;
4252
4253 load = hdrtime;
4254 if (!is_multicast_ether_addr(hdr->addr1))
4255 load += hdrtime;
4256
4257 load += skb->len * rate->rate_inv;
4258
4259 /* Divide channel_use by 8 to avoid wrapping around the counter */
4260 load >>= CHAN_UTIL_SHIFT;
4261 local->channel_use_raw += load;
4262 if (rx->sta)
4263 rx->sta->channel_use_raw += load;
4264 rx->u.rx.load = load;
4265
4266 return TXRX_CONTINUE;
4267 }
4268
4269 static ieee80211_txrx_result
4270 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
4271 {
4272 rx->sdata->channel_use_raw += rx->u.rx.load;
4273 return TXRX_CONTINUE;
4274 }
4275
4276 static void ieee80211_stat_refresh(unsigned long data)
4277 {
4278 struct ieee80211_local *local = (struct ieee80211_local *) data;
4279 struct sta_info *sta;
4280 struct ieee80211_sub_if_data *sdata;
4281
4282 if (!local->stat_time)
4283 return;
4284
4285 /* go through all stations */
4286 spin_lock_bh(&local->sta_lock);
4287 list_for_each_entry(sta, &local->sta_list, list) {
4288 sta->channel_use = (sta->channel_use_raw / local->stat_time) /
4289 CHAN_UTIL_PER_10MS;
4290 sta->channel_use_raw = 0;
4291 }
4292 spin_unlock_bh(&local->sta_lock);
4293
4294 /* go through all subinterfaces */
4295 read_lock(&local->sub_if_lock);
4296 list_for_each_entry(sdata, &local->sub_if_list, list) {
4297 sdata->channel_use = (sdata->channel_use_raw /
4298 local->stat_time) / CHAN_UTIL_PER_10MS;
4299 sdata->channel_use_raw = 0;
4300 }
4301 read_unlock(&local->sub_if_lock);
4302
4303 /* hardware interface */
4304 local->channel_use = (local->channel_use_raw /
4305 local->stat_time) / CHAN_UTIL_PER_10MS;
4306 local->channel_use_raw = 0;
4307
4308 local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
4309 add_timer(&local->stat_timer);
4310 }
4311
4312
4313 /* This is a version of the rx handler that can be called from hard irq
4314 * context. Post the skb on the queue and schedule the tasklet */
4315 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
4316 struct ieee80211_rx_status *status)
4317 {
4318 struct ieee80211_local *local = hw_to_local(hw);
4319
4320 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4321
4322 skb->dev = local->mdev;
4323 /* copy status into skb->cb for use by tasklet */
4324 memcpy(skb->cb, status, sizeof(*status));
4325 skb->pkt_type = IEEE80211_RX_MSG;
4326 skb_queue_tail(&local->skb_queue, skb);
4327 tasklet_schedule(&local->tasklet);
4328 }
4329 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4330
4331 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
4332 struct sk_buff *skb,
4333 struct ieee80211_tx_status *status)
4334 {
4335 struct ieee80211_local *local = hw_to_local(hw);
4336 struct ieee80211_tx_status *saved;
4337 int tmp;
4338
4339 skb->dev = local->mdev;
4340 saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
4341 if (unlikely(!saved)) {
4342 if (net_ratelimit())
4343 printk(KERN_WARNING "%s: Not enough memory, "
4344 "dropping tx status", skb->dev->name);
4345 /* should be dev_kfree_skb_irq, but due to this function being
4346 * named _irqsafe instead of just _irq we can't be sure that
4347 * people won't call it from non-irq contexts */
4348 dev_kfree_skb_any(skb);
4349 return;
4350 }
4351 memcpy(saved, status, sizeof(struct ieee80211_tx_status));
4352 /* copy pointer to saved status into skb->cb for use by tasklet */
4353 memcpy(skb->cb, &saved, sizeof(saved));
4354
4355 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
4356 skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
4357 &local->skb_queue : &local->skb_queue_unreliable, skb);
4358 tmp = skb_queue_len(&local->skb_queue) +
4359 skb_queue_len(&local->skb_queue_unreliable);
4360 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
4361 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4362 memcpy(&saved, skb->cb, sizeof(saved));
4363 kfree(saved);
4364 dev_kfree_skb_irq(skb);
4365 tmp--;
4366 I802_DEBUG_INC(local->tx_status_drop);
4367 }
4368 tasklet_schedule(&local->tasklet);
4369 }
4370 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
4371
4372 static void ieee80211_tasklet_handler(unsigned long data)
4373 {
4374 struct ieee80211_local *local = (struct ieee80211_local *) data;
4375 struct sk_buff *skb;
4376 struct ieee80211_rx_status rx_status;
4377 struct ieee80211_tx_status *tx_status;
4378
4379 while ((skb = skb_dequeue(&local->skb_queue)) ||
4380 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4381 switch (skb->pkt_type) {
4382 case IEEE80211_RX_MSG:
4383 /* status is in skb->cb */
4384 memcpy(&rx_status, skb->cb, sizeof(rx_status));
4385 /* Clear skb->type in order to not confuse kernel
4386 * netstack. */
4387 skb->pkt_type = 0;
4388 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
4389 break;
4390 case IEEE80211_TX_STATUS_MSG:
4391 /* get pointer to saved status out of skb->cb */
4392 memcpy(&tx_status, skb->cb, sizeof(tx_status));
4393 skb->pkt_type = 0;
4394 ieee80211_tx_status(local_to_hw(local),
4395 skb, tx_status);
4396 kfree(tx_status);
4397 break;
4398 default: /* should never get here! */
4399 printk(KERN_ERR "%s: Unknown message type (%d)\n",
4400 local->mdev->name, skb->pkt_type);
4401 dev_kfree_skb(skb);
4402 break;
4403 }
4404 }
4405 }
4406
4407
4408 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
4409 * make a prepared TX frame (one that has been given to hw) to look like brand
4410 * new IEEE 802.11 frame that is ready to go through TX processing again.
4411 * Also, tx_packet_data in cb is restored from tx_control. */
4412 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
4413 struct ieee80211_key *key,
4414 struct sk_buff *skb,
4415 struct ieee80211_tx_control *control)
4416 {
4417 int hdrlen, iv_len, mic_len;
4418 struct ieee80211_tx_packet_data *pkt_data;
4419
4420 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
4421 pkt_data->ifindex = control->ifindex;
4422 pkt_data->mgmt_iface = (control->type == IEEE80211_IF_TYPE_MGMT);
4423 pkt_data->req_tx_status = !!(control->flags & IEEE80211_TXCTL_REQ_TX_STATUS);
4424 pkt_data->do_not_encrypt = !!(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT);
4425 pkt_data->requeue = !!(control->flags & IEEE80211_TXCTL_REQUEUE);
4426 pkt_data->queue = control->queue;
4427
4428 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
4429
4430 if (!key)
4431 goto no_key;
4432
4433 switch (key->alg) {
4434 case ALG_WEP:
4435 iv_len = WEP_IV_LEN;
4436 mic_len = WEP_ICV_LEN;
4437 break;
4438 case ALG_TKIP:
4439 iv_len = TKIP_IV_LEN;
4440 mic_len = TKIP_ICV_LEN;
4441 break;
4442 case ALG_CCMP:
4443 iv_len = CCMP_HDR_LEN;
4444 mic_len = CCMP_MIC_LEN;
4445 break;
4446 default:
4447 goto no_key;
4448 }
4449
4450 if (skb->len >= mic_len && key->force_sw_encrypt)
4451 skb_trim(skb, skb->len - mic_len);
4452 if (skb->len >= iv_len && skb->len > hdrlen) {
4453 memmove(skb->data + iv_len, skb->data, hdrlen);
4454 skb_pull(skb, iv_len);
4455 }
4456
4457 no_key:
4458 {
4459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4460 u16 fc = le16_to_cpu(hdr->frame_control);
4461 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
4462 fc &= ~IEEE80211_STYPE_QOS_DATA;
4463 hdr->frame_control = cpu_to_le16(fc);
4464 memmove(skb->data + 2, skb->data, hdrlen - 2);
4465 skb_pull(skb, 2);
4466 }
4467 }
4468 }
4469
4470
4471 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
4472 struct ieee80211_tx_status *status)
4473 {
4474 struct sk_buff *skb2;
4475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4476 struct ieee80211_local *local = hw_to_local(hw);
4477 u16 frag, type;
4478 u32 msg_type;
4479 struct ieee80211_tx_status_rtap_hdr *rthdr;
4480 struct ieee80211_sub_if_data *sdata;
4481 int monitors;
4482
4483 if (!status) {
4484 printk(KERN_ERR
4485 "%s: ieee80211_tx_status called with NULL status\n",
4486 local->mdev->name);
4487 dev_kfree_skb(skb);
4488 return;
4489 }
4490
4491 if (status->excessive_retries) {
4492 struct sta_info *sta;
4493 sta = sta_info_get(local, hdr->addr1);
4494 if (sta) {
4495 if (sta->flags & WLAN_STA_PS) {
4496 /* The STA is in power save mode, so assume
4497 * that this TX packet failed because of that.
4498 */
4499 status->excessive_retries = 0;
4500 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
4501 }
4502 sta_info_put(sta);
4503 }
4504 }
4505
4506 if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
4507 struct sta_info *sta;
4508 sta = sta_info_get(local, hdr->addr1);
4509 if (sta) {
4510 sta->tx_filtered_count++;
4511
4512 /* Clear the TX filter mask for this STA when sending
4513 * the next packet. If the STA went to power save mode,
4514 * this will happen when it is waking up for the next
4515 * time. */
4516 sta->clear_dst_mask = 1;
4517
4518 /* TODO: Is the WLAN_STA_PS flag always set here or is
4519 * the race between RX and TX status causing some
4520 * packets to be filtered out before 80211.o gets an
4521 * update for PS status? This seems to be the case, so
4522 * no changes are likely to be needed. */
4523 if (sta->flags & WLAN_STA_PS &&
4524 skb_queue_len(&sta->tx_filtered) <
4525 STA_MAX_TX_BUFFER) {
4526 ieee80211_remove_tx_extra(local, sta->key,
4527 skb,
4528 &status->control);
4529 skb_queue_tail(&sta->tx_filtered, skb);
4530 } else if (!(sta->flags & WLAN_STA_PS) &&
4531 !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
4532 /* Software retry the packet once */
4533 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
4534 ieee80211_remove_tx_extra(local, sta->key,
4535 skb,
4536 &status->control);
4537 dev_queue_xmit(skb);
4538 } else {
4539 if (net_ratelimit()) {
4540 printk(KERN_DEBUG "%s: dropped TX "
4541 "filtered frame queue_len=%d "
4542 "PS=%d @%lu\n",
4543 local->mdev->name,
4544 skb_queue_len(
4545 &sta->tx_filtered),
4546 !!(sta->flags & WLAN_STA_PS),
4547 jiffies);
4548 }
4549 dev_kfree_skb(skb);
4550 }
4551 sta_info_put(sta);
4552 return;
4553 }
4554 } else {
4555 /* FIXME: STUPID to call this with both local and local->mdev */
4556 rate_control_tx_status(local, local->mdev, skb, status);
4557 }
4558
4559 ieee80211_led_tx(local, 0);
4560
4561 /* SNMP counters
4562 * Fragments are passed to low-level drivers as separate skbs, so these
4563 * are actually fragments, not frames. Update frame counters only for
4564 * the first fragment of the frame. */
4565
4566 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
4567 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
4568
4569 if (status->flags & IEEE80211_TX_STATUS_ACK) {
4570 if (frag == 0) {
4571 local->dot11TransmittedFrameCount++;
4572 if (is_multicast_ether_addr(hdr->addr1))
4573 local->dot11MulticastTransmittedFrameCount++;
4574 if (status->retry_count > 0)
4575 local->dot11RetryCount++;
4576 if (status->retry_count > 1)
4577 local->dot11MultipleRetryCount++;
4578 }
4579
4580 /* This counter shall be incremented for an acknowledged MPDU
4581 * with an individual address in the address 1 field or an MPDU
4582 * with a multicast address in the address 1 field of type Data
4583 * or Management. */
4584 if (!is_multicast_ether_addr(hdr->addr1) ||
4585 type == IEEE80211_FTYPE_DATA ||
4586 type == IEEE80211_FTYPE_MGMT)
4587 local->dot11TransmittedFragmentCount++;
4588 } else {
4589 if (frag == 0)
4590 local->dot11FailedCount++;
4591 }
4592
4593 msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
4594 ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
4595
4596 /* this was a transmitted frame, but now we want to reuse it */
4597 skb_orphan(skb);
4598
4599 if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
4600 local->apdev) {
4601 if (local->monitors) {
4602 skb2 = skb_clone(skb, GFP_ATOMIC);
4603 } else {
4604 skb2 = skb;
4605 skb = NULL;
4606 }
4607
4608 if (skb2)
4609 /* Send frame to hostapd */
4610 ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
4611
4612 if (!skb)
4613 return;
4614 }
4615
4616 if (!local->monitors) {
4617 dev_kfree_skb(skb);
4618 return;
4619 }
4620
4621 /* send frame to monitor interfaces now */
4622
4623 if (skb_headroom(skb) < sizeof(*rthdr)) {
4624 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
4625 dev_kfree_skb(skb);
4626 return;
4627 }
4628
4629 rthdr = (struct ieee80211_tx_status_rtap_hdr*)
4630 skb_push(skb, sizeof(*rthdr));
4631
4632 memset(rthdr, 0, sizeof(*rthdr));
4633 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
4634 rthdr->hdr.it_present =
4635 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
4636 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
4637
4638 if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
4639 !is_multicast_ether_addr(hdr->addr1))
4640 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
4641
4642 if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
4643 (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
4644 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
4645 else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
4646 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
4647
4648 rthdr->data_retries = status->retry_count;
4649
4650 read_lock(&local->sub_if_lock);
4651 monitors = local->monitors;
4652 list_for_each_entry(sdata, &local->sub_if_list, list) {
4653 /*
4654 * Using the monitors counter is possibly racy, but
4655 * if the value is wrong we simply either clone the skb
4656 * once too much or forget sending it to one monitor iface
4657 * The latter case isn't nice but fixing the race is much
4658 * more complicated.
4659 */
4660 if (!monitors || !skb)
4661 goto out;
4662
4663 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
4664 if (!netif_running(sdata->dev))
4665 continue;
4666 monitors--;
4667 if (monitors)
4668 skb2 = skb_clone(skb, GFP_KERNEL);
4669 else
4670 skb2 = NULL;
4671 skb->dev = sdata->dev;
4672 /* XXX: is this sufficient for BPF? */
4673 skb_set_mac_header(skb, 0);
4674 skb->ip_summed = CHECKSUM_UNNECESSARY;
4675 skb->pkt_type = PACKET_OTHERHOST;
4676 skb->protocol = htons(ETH_P_802_2);
4677 memset(skb->cb, 0, sizeof(skb->cb));
4678 netif_rx(skb);
4679 skb = skb2;
4680 break;
4681 }
4682 }
4683 out:
4684 read_unlock(&local->sub_if_lock);
4685 if (skb)
4686 dev_kfree_skb(skb);
4687 }
4688 EXPORT_SYMBOL(ieee80211_tx_status);
4689
4690 /* TODO: implement register/unregister functions for adding TX/RX handlers
4691 * into ordered list */
4692
4693 /* rx_pre handlers don't have dev and sdata fields available in
4694 * ieee80211_txrx_data */
4695 static ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
4696 {
4697 ieee80211_rx_h_parse_qos,
4698 ieee80211_rx_h_load_stats,
4699 NULL
4700 };
4701
4702 static ieee80211_rx_handler ieee80211_rx_handlers[] =
4703 {
4704 ieee80211_rx_h_if_stats,
4705 ieee80211_rx_h_monitor,
4706 ieee80211_rx_h_passive_scan,
4707 ieee80211_rx_h_check,
4708 ieee80211_rx_h_sta_process,
4709 ieee80211_rx_h_ccmp_decrypt,
4710 ieee80211_rx_h_tkip_decrypt,
4711 ieee80211_rx_h_wep_weak_iv_detection,
4712 ieee80211_rx_h_wep_decrypt,
4713 ieee80211_rx_h_defragment,
4714 ieee80211_rx_h_ps_poll,
4715 ieee80211_rx_h_michael_mic_verify,
4716 /* this must be after decryption - so header is counted in MPDU mic
4717 * must be before pae and data, so QOS_DATA format frames
4718 * are not passed to user space by these functions
4719 */
4720 ieee80211_rx_h_remove_qos_control,
4721 ieee80211_rx_h_802_1x_pae,
4722 ieee80211_rx_h_drop_unencrypted,
4723 ieee80211_rx_h_data,
4724 ieee80211_rx_h_mgmt,
4725 NULL
4726 };
4727
4728 static ieee80211_tx_handler ieee80211_tx_handlers[] =
4729 {
4730 ieee80211_tx_h_check_assoc,
4731 ieee80211_tx_h_sequence,
4732 ieee80211_tx_h_ps_buf,
4733 ieee80211_tx_h_select_key,
4734 ieee80211_tx_h_michael_mic_add,
4735 ieee80211_tx_h_fragment,
4736 ieee80211_tx_h_tkip_encrypt,
4737 ieee80211_tx_h_ccmp_encrypt,
4738 ieee80211_tx_h_wep_encrypt,
4739 ieee80211_tx_h_rate_ctrl,
4740 ieee80211_tx_h_misc,
4741 ieee80211_tx_h_load_stats,
4742 NULL
4743 };
4744
4745
4746 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
4747 {
4748 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4749 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4750 struct sta_info *sta;
4751
4752 if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
4753 return 0;
4754
4755 /* Create STA entry for the new peer */
4756 sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
4757 if (!sta)
4758 return -ENOMEM;
4759 sta_info_put(sta);
4760
4761 /* Remove STA entry for the old peer */
4762 sta = sta_info_get(local, sdata->u.wds.remote_addr);
4763 if (sta) {
4764 sta_info_put(sta);
4765 sta_info_free(sta, 0);
4766 } else {
4767 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
4768 "peer " MAC_FMT "\n",
4769 dev->name, MAC_ARG(sdata->u.wds.remote_addr));
4770 }
4771
4772 /* Update WDS link data */
4773 memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
4774
4775 return 0;
4776 }
4777
4778 /* Must not be called for mdev and apdev */
4779 void ieee80211_if_setup(struct net_device *dev)
4780 {
4781 ether_setup(dev);
4782 dev->hard_start_xmit = ieee80211_subif_start_xmit;
4783 dev->wireless_handlers = &ieee80211_iw_handler_def;
4784 dev->set_multicast_list = ieee80211_set_multicast_list;
4785 dev->change_mtu = ieee80211_change_mtu;
4786 dev->get_stats = ieee80211_get_stats;
4787 dev->open = ieee80211_open;
4788 dev->stop = ieee80211_stop;
4789 dev->uninit = ieee80211_if_reinit;
4790 dev->destructor = ieee80211_if_free;
4791 }
4792
4793 void ieee80211_if_mgmt_setup(struct net_device *dev)
4794 {
4795 ether_setup(dev);
4796 dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
4797 dev->change_mtu = ieee80211_change_mtu_apdev;
4798 dev->get_stats = ieee80211_get_stats;
4799 dev->open = ieee80211_mgmt_open;
4800 dev->stop = ieee80211_mgmt_stop;
4801 dev->type = ARPHRD_IEEE80211_PRISM;
4802 dev->hard_header_parse = header_parse_80211;
4803 dev->uninit = ieee80211_if_reinit;
4804 dev->destructor = ieee80211_if_free;
4805 }
4806
4807 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
4808 const char *name)
4809 {
4810 struct rate_control_ref *ref, *old;
4811
4812 ASSERT_RTNL();
4813 if (local->open_count || netif_running(local->mdev) ||
4814 (local->apdev && netif_running(local->apdev)))
4815 return -EBUSY;
4816
4817 ref = rate_control_alloc(name, local);
4818 if (!ref) {
4819 printk(KERN_WARNING "%s: Failed to select rate control "
4820 "algorithm\n", local->mdev->name);
4821 return -ENOENT;
4822 }
4823
4824 old = local->rate_ctrl;
4825 local->rate_ctrl = ref;
4826 if (old) {
4827 rate_control_put(old);
4828 sta_info_flush(local, NULL);
4829 }
4830
4831 printk(KERN_DEBUG "%s: Selected rate control "
4832 "algorithm '%s'\n", local->mdev->name,
4833 ref->ops->name);
4834
4835
4836 return 0;
4837 }
4838
4839 static void rate_control_deinitialize(struct ieee80211_local *local)
4840 {
4841 struct rate_control_ref *ref;
4842
4843 ref = local->rate_ctrl;
4844 local->rate_ctrl = NULL;
4845 rate_control_put(ref);
4846 }
4847
4848 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
4849 const struct ieee80211_ops *ops)
4850 {
4851 struct net_device *mdev;
4852 struct ieee80211_local *local;
4853 struct ieee80211_sub_if_data *sdata;
4854 int priv_size;
4855 struct wiphy *wiphy;
4856
4857 /* Ensure 32-byte alignment of our private data and hw private data.
4858 * We use the wiphy priv data for both our ieee80211_local and for
4859 * the driver's private data
4860 *
4861 * In memory it'll be like this:
4862 *
4863 * +-------------------------+
4864 * | struct wiphy |
4865 * +-------------------------+
4866 * | struct ieee80211_local |
4867 * +-------------------------+
4868 * | driver's private data |
4869 * +-------------------------+
4870 *
4871 */
4872 priv_size = ((sizeof(struct ieee80211_local) +
4873 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
4874 priv_data_len;
4875
4876 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
4877
4878 if (!wiphy)
4879 return NULL;
4880
4881 wiphy->privid = mac80211_wiphy_privid;
4882
4883 local = wiphy_priv(wiphy);
4884 local->hw.wiphy = wiphy;
4885
4886 local->hw.priv = (char *)local +
4887 ((sizeof(struct ieee80211_local) +
4888 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4889
4890 BUG_ON(!ops->tx);
4891 BUG_ON(!ops->config);
4892 BUG_ON(!ops->add_interface);
4893 local->ops = ops;
4894
4895 /* for now, mdev needs sub_if_data :/ */
4896 mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
4897 "wmaster%d", ether_setup);
4898 if (!mdev) {
4899 wiphy_free(wiphy);
4900 return NULL;
4901 }
4902
4903 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
4904 mdev->ieee80211_ptr = &sdata->wdev;
4905 sdata->wdev.wiphy = wiphy;
4906
4907 local->hw.queues = 1; /* default */
4908
4909 local->mdev = mdev;
4910 local->rx_pre_handlers = ieee80211_rx_pre_handlers;
4911 local->rx_handlers = ieee80211_rx_handlers;
4912 local->tx_handlers = ieee80211_tx_handlers;
4913
4914 local->bridge_packets = 1;
4915
4916 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
4917 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
4918 local->short_retry_limit = 7;
4919 local->long_retry_limit = 4;
4920 local->hw.conf.radio_enabled = 1;
4921
4922 local->enabled_modes = (unsigned int) -1;
4923
4924 INIT_LIST_HEAD(&local->modes_list);
4925
4926 rwlock_init(&local->sub_if_lock);
4927 INIT_LIST_HEAD(&local->sub_if_list);
4928
4929 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
4930 init_timer(&local->stat_timer);
4931 local->stat_timer.function = ieee80211_stat_refresh;
4932 local->stat_timer.data = (unsigned long) local;
4933 ieee80211_rx_bss_list_init(mdev);
4934
4935 sta_info_init(local);
4936
4937 mdev->hard_start_xmit = ieee80211_master_start_xmit;
4938 mdev->open = ieee80211_master_open;
4939 mdev->stop = ieee80211_master_stop;
4940 mdev->type = ARPHRD_IEEE80211;
4941 mdev->hard_header_parse = header_parse_80211;
4942
4943 sdata->type = IEEE80211_IF_TYPE_AP;
4944 sdata->dev = mdev;
4945 sdata->local = local;
4946 sdata->u.ap.force_unicast_rateidx = -1;
4947 sdata->u.ap.max_ratectrl_rateidx = -1;
4948 ieee80211_if_sdata_init(sdata);
4949 list_add_tail(&sdata->list, &local->sub_if_list);
4950
4951 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
4952 (unsigned long)local);
4953 tasklet_disable(&local->tx_pending_tasklet);
4954
4955 tasklet_init(&local->tasklet,
4956 ieee80211_tasklet_handler,
4957 (unsigned long) local);
4958 tasklet_disable(&local->tasklet);
4959
4960 skb_queue_head_init(&local->skb_queue);
4961 skb_queue_head_init(&local->skb_queue_unreliable);
4962
4963 return local_to_hw(local);
4964 }
4965 EXPORT_SYMBOL(ieee80211_alloc_hw);
4966
4967 int ieee80211_register_hw(struct ieee80211_hw *hw)
4968 {
4969 struct ieee80211_local *local = hw_to_local(hw);
4970 const char *name;
4971 int result;
4972
4973 result = wiphy_register(local->hw.wiphy);
4974 if (result < 0)
4975 return result;
4976
4977 name = wiphy_dev(local->hw.wiphy)->driver->name;
4978 local->hw.workqueue = create_singlethread_workqueue(name);
4979 if (!local->hw.workqueue) {
4980 result = -ENOMEM;
4981 goto fail_workqueue;
4982 }
4983
4984 /*
4985 * The hardware needs headroom for sending the frame,
4986 * and we need some headroom for passing the frame to monitor
4987 * interfaces, but never both at the same time.
4988 */
4989 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
4990 sizeof(struct ieee80211_tx_status_rtap_hdr));
4991
4992 debugfs_hw_add(local);
4993
4994 local->hw.conf.beacon_int = 1000;
4995
4996 local->wstats_flags |= local->hw.max_rssi ?
4997 IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
4998 local->wstats_flags |= local->hw.max_signal ?
4999 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
5000 local->wstats_flags |= local->hw.max_noise ?
5001 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
5002 if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
5003 local->wstats_flags |= IW_QUAL_DBM;
5004
5005 result = sta_info_start(local);
5006 if (result < 0)
5007 goto fail_sta_info;
5008
5009 rtnl_lock();
5010 result = dev_alloc_name(local->mdev, local->mdev->name);
5011 if (result < 0)
5012 goto fail_dev;
5013
5014 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
5015 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
5016
5017 result = register_netdevice(local->mdev);
5018 if (result < 0)
5019 goto fail_dev;
5020
5021 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5022
5023 result = ieee80211_init_rate_ctrl_alg(local, NULL);
5024 if (result < 0) {
5025 printk(KERN_DEBUG "%s: Failed to initialize rate control "
5026 "algorithm\n", local->mdev->name);
5027 goto fail_rate;
5028 }
5029
5030 result = ieee80211_wep_init(local);
5031
5032 if (result < 0) {
5033 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
5034 local->mdev->name);
5035 goto fail_wep;
5036 }
5037
5038 ieee80211_install_qdisc(local->mdev);
5039
5040 /* add one default STA interface */
5041 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
5042 IEEE80211_IF_TYPE_STA);
5043 if (result)
5044 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
5045 local->mdev->name);
5046
5047 local->reg_state = IEEE80211_DEV_REGISTERED;
5048 rtnl_unlock();
5049
5050 ieee80211_led_init(local);
5051
5052 return 0;
5053
5054 fail_wep:
5055 rate_control_deinitialize(local);
5056 fail_rate:
5057 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5058 unregister_netdevice(local->mdev);
5059 fail_dev:
5060 rtnl_unlock();
5061 sta_info_stop(local);
5062 fail_sta_info:
5063 debugfs_hw_del(local);
5064 destroy_workqueue(local->hw.workqueue);
5065 fail_workqueue:
5066 wiphy_unregister(local->hw.wiphy);
5067 return result;
5068 }
5069 EXPORT_SYMBOL(ieee80211_register_hw);
5070
5071 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
5072 struct ieee80211_hw_mode *mode)
5073 {
5074 struct ieee80211_local *local = hw_to_local(hw);
5075 struct ieee80211_rate *rate;
5076 int i;
5077
5078 INIT_LIST_HEAD(&mode->list);
5079 list_add_tail(&mode->list, &local->modes_list);
5080
5081 local->hw_modes |= (1 << mode->mode);
5082 for (i = 0; i < mode->num_rates; i++) {
5083 rate = &(mode->rates[i]);
5084 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
5085 }
5086 ieee80211_prepare_rates(local, mode);
5087
5088 if (!local->oper_hw_mode) {
5089 /* Default to this mode */
5090 local->hw.conf.phymode = mode->mode;
5091 local->oper_hw_mode = local->scan_hw_mode = mode;
5092 local->oper_channel = local->scan_channel = &mode->channels[0];
5093 local->hw.conf.mode = local->oper_hw_mode;
5094 local->hw.conf.chan = local->oper_channel;
5095 }
5096
5097 if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
5098 ieee80211_set_default_regdomain(mode);
5099
5100 return 0;
5101 }
5102 EXPORT_SYMBOL(ieee80211_register_hwmode);
5103
5104 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
5105 {
5106 struct ieee80211_local *local = hw_to_local(hw);
5107 struct ieee80211_sub_if_data *sdata, *tmp;
5108 struct list_head tmp_list;
5109 int i;
5110
5111 tasklet_kill(&local->tx_pending_tasklet);
5112 tasklet_kill(&local->tasklet);
5113
5114 rtnl_lock();
5115
5116 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
5117
5118 local->reg_state = IEEE80211_DEV_UNREGISTERED;
5119 if (local->apdev)
5120 ieee80211_if_del_mgmt(local);
5121
5122 write_lock_bh(&local->sub_if_lock);
5123 list_replace_init(&local->sub_if_list, &tmp_list);
5124 write_unlock_bh(&local->sub_if_lock);
5125
5126 list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
5127 __ieee80211_if_del(local, sdata);
5128
5129 rtnl_unlock();
5130
5131 if (local->stat_time)
5132 del_timer_sync(&local->stat_timer);
5133
5134 ieee80211_rx_bss_list_deinit(local->mdev);
5135 ieee80211_clear_tx_pending(local);
5136 sta_info_stop(local);
5137 rate_control_deinitialize(local);
5138 debugfs_hw_del(local);
5139
5140 for (i = 0; i < NUM_IEEE80211_MODES; i++) {
5141 kfree(local->supp_rates[i]);
5142 kfree(local->basic_rates[i]);
5143 }
5144
5145 if (skb_queue_len(&local->skb_queue)
5146 || skb_queue_len(&local->skb_queue_unreliable))
5147 printk(KERN_WARNING "%s: skb_queue not empty\n",
5148 local->mdev->name);
5149 skb_queue_purge(&local->skb_queue);
5150 skb_queue_purge(&local->skb_queue_unreliable);
5151
5152 destroy_workqueue(local->hw.workqueue);
5153 wiphy_unregister(local->hw.wiphy);
5154 ieee80211_wep_free(local);
5155 ieee80211_led_exit(local);
5156 }
5157 EXPORT_SYMBOL(ieee80211_unregister_hw);
5158
5159 void ieee80211_free_hw(struct ieee80211_hw *hw)
5160 {
5161 struct ieee80211_local *local = hw_to_local(hw);
5162
5163 ieee80211_if_free(local->mdev);
5164 wiphy_free(local->hw.wiphy);
5165 }
5166 EXPORT_SYMBOL(ieee80211_free_hw);
5167
5168 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
5169 {
5170 struct ieee80211_local *local = hw_to_local(hw);
5171
5172 if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
5173 &local->state[queue])) {
5174 if (test_bit(IEEE80211_LINK_STATE_PENDING,
5175 &local->state[queue]))
5176 tasklet_schedule(&local->tx_pending_tasklet);
5177 else
5178 if (!ieee80211_qdisc_installed(local->mdev)) {
5179 if (queue == 0)
5180 netif_wake_queue(local->mdev);
5181 } else
5182 __netif_schedule(local->mdev);
5183 }
5184 }
5185 EXPORT_SYMBOL(ieee80211_wake_queue);
5186
5187 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
5188 {
5189 struct ieee80211_local *local = hw_to_local(hw);
5190
5191 if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
5192 netif_stop_queue(local->mdev);
5193 set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
5194 }
5195 EXPORT_SYMBOL(ieee80211_stop_queue);
5196
5197 void ieee80211_start_queues(struct ieee80211_hw *hw)
5198 {
5199 struct ieee80211_local *local = hw_to_local(hw);
5200 int i;
5201
5202 for (i = 0; i < local->hw.queues; i++)
5203 clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
5204 if (!ieee80211_qdisc_installed(local->mdev))
5205 netif_start_queue(local->mdev);
5206 }
5207 EXPORT_SYMBOL(ieee80211_start_queues);
5208
5209 void ieee80211_stop_queues(struct ieee80211_hw *hw)
5210 {
5211 int i;
5212
5213 for (i = 0; i < hw->queues; i++)
5214 ieee80211_stop_queue(hw, i);
5215 }
5216 EXPORT_SYMBOL(ieee80211_stop_queues);
5217
5218 void ieee80211_wake_queues(struct ieee80211_hw *hw)
5219 {
5220 int i;
5221
5222 for (i = 0; i < hw->queues; i++)
5223 ieee80211_wake_queue(hw, i);
5224 }
5225 EXPORT_SYMBOL(ieee80211_wake_queues);
5226
5227 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
5228 {
5229 struct ieee80211_sub_if_data *sdata;
5230 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5231 return &sdata->stats;
5232 }
5233
5234 static int __init ieee80211_init(void)
5235 {
5236 struct sk_buff *skb;
5237 int ret;
5238
5239 BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
5240
5241 ret = ieee80211_wme_register();
5242 if (ret) {
5243 printk(KERN_DEBUG "ieee80211_init: failed to "
5244 "initialize WME (err=%d)\n", ret);
5245 return ret;
5246 }
5247
5248 ieee80211_debugfs_netdev_init();
5249 ieee80211_regdomain_init();
5250
5251 return 0;
5252 }
5253
5254
5255 static void __exit ieee80211_exit(void)
5256 {
5257 ieee80211_wme_unregister();
5258 ieee80211_debugfs_netdev_exit();
5259 }
5260
5261
5262 module_init(ieee80211_init);
5263 module_exit(ieee80211_exit);
5264
5265 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
5266 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)