?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[MAC80211]: remove turbo modes
[linux-2.6/verdex.git] / net / mac80211 / tx.c
blob08d221674bc04ebe6410a97a70e9c1d900e98d7b
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 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "ieee80211_led.h"
29 #include "wep.h"
30 #include "wpa.h"
31 #include "wme.h"
32 #include "ieee80211_rate.h"
33
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
37
38 /* misc utils */
39
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_hdr *hdr)
42 {
43 /* Set the sequence number for this frame. */
44 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
45
46 /* Increase the sequence number. */
47 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
48 }
49
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname, const char *title,
52 const struct sk_buff *skb)
53 {
54 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
55 u16 fc;
56 int hdrlen;
57
58 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
59 if (skb->len < 4) {
60 printk("\n");
61 return;
62 }
63
64 fc = le16_to_cpu(hdr->frame_control);
65 hdrlen = ieee80211_get_hdrlen(fc);
66 if (hdrlen > skb->len)
67 hdrlen = skb->len;
68 if (hdrlen >= 4)
69 printk(" FC=0x%04x DUR=0x%04x",
70 fc, le16_to_cpu(hdr->duration_id));
71 if (hdrlen >= 10)
72 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
73 if (hdrlen >= 16)
74 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
75 if (hdrlen >= 24)
76 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
77 if (hdrlen >= 30)
78 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
79 printk("\n");
80 }
81 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
82 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
83 struct sk_buff *skb)
84 {
85 }
86 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
87
88 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
89 int next_frag_len)
90 {
91 int rate, mrate, erp, dur, i;
92 struct ieee80211_rate *txrate = tx->u.tx.rate;
93 struct ieee80211_local *local = tx->local;
94 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
95
96 erp = txrate->flags & IEEE80211_RATE_ERP;
97
98 /*
99 * data and mgmt (except PS Poll):
100 * - during CFP: 32768
101 * - during contention period:
102 * if addr1 is group address: 0
103 * if more fragments = 0 and addr1 is individual address: time to
104 * transmit one ACK plus SIFS
105 * if more fragments = 1 and addr1 is individual address: time to
106 * transmit next fragment plus 2 x ACK plus 3 x SIFS
107 *
108 * IEEE 802.11, 9.6:
109 * - control response frame (CTS or ACK) shall be transmitted using the
110 * same rate as the immediately previous frame in the frame exchange
111 * sequence, if this rate belongs to the PHY mandatory rates, or else
112 * at the highest possible rate belonging to the PHY rates in the
113 * BSSBasicRateSet
114 */
115
116 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
117 /* TODO: These control frames are not currently sent by
118 * 80211.o, but should they be implemented, this function
119 * needs to be updated to support duration field calculation.
120 *
121 * RTS: time needed to transmit pending data/mgmt frame plus
122 * one CTS frame plus one ACK frame plus 3 x SIFS
123 * CTS: duration of immediately previous RTS minus time
124 * required to transmit CTS and its SIFS
125 * ACK: 0 if immediately previous directed data/mgmt had
126 * more=0, with more=1 duration in ACK frame is duration
127 * from previous frame minus time needed to transmit ACK
128 * and its SIFS
129 * PS Poll: BIT(15) | BIT(14) | aid
130 */
131 return 0;
132 }
133
134 /* data/mgmt */
135 if (0 /* FIX: data/mgmt during CFP */)
136 return 32768;
137
138 if (group_addr) /* Group address as the destination - no ACK */
139 return 0;
140
141 /* Individual destination address:
142 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
143 * CTS and ACK frames shall be transmitted using the highest rate in
144 * basic rate set that is less than or equal to the rate of the
145 * immediately previous frame and that is using the same modulation
146 * (CCK or OFDM). If no basic rate set matches with these requirements,
147 * the highest mandatory rate of the PHY that is less than or equal to
148 * the rate of the previous frame is used.
149 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
150 */
151 rate = -1;
152 mrate = 10; /* use 1 Mbps if everything fails */
153 for (i = 0; i < mode->num_rates; i++) {
154 struct ieee80211_rate *r = &mode->rates[i];
155 if (r->rate > txrate->rate)
156 break;
157
158 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
159 IEEE80211_RATE_MODULATION(r->flags))
160 continue;
161
162 if (r->flags & IEEE80211_RATE_BASIC)
163 rate = r->rate;
164 else if (r->flags & IEEE80211_RATE_MANDATORY)
165 mrate = r->rate;
166 }
167 if (rate == -1) {
168 /* No matching basic rate found; use highest suitable mandatory
169 * PHY rate */
170 rate = mrate;
171 }
172
173 /* Time needed to transmit ACK
174 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
175 * to closest integer */
176
177 dur = ieee80211_frame_duration(local, 10, rate, erp,
178 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
179
180 if (next_frag_len) {
181 /* Frame is fragmented: duration increases with time needed to
182 * transmit next fragment plus ACK and 2 x SIFS. */
183 dur *= 2; /* ACK + SIFS */
184 /* next fragment */
185 dur += ieee80211_frame_duration(local, next_frag_len,
186 txrate->rate, erp,
187 tx->sdata->flags &
188 IEEE80211_SDATA_SHORT_PREAMBLE);
189 }
190
191 return dur;
192 }
193
194 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
195 int queue)
196 {
197 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
198 }
199
200 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
201 int queue)
202 {
203 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
204 }
205
206 static int inline is_ieee80211_device(struct net_device *dev,
207 struct net_device *master)
208 {
209 return (wdev_priv(dev->ieee80211_ptr) ==
210 wdev_priv(master->ieee80211_ptr));
211 }
212
213 /* tx handlers */
214
215 static ieee80211_txrx_result
216 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
217 {
218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
219 struct sk_buff *skb = tx->skb;
220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
221 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
222 u32 sta_flags;
223
224 if (unlikely(tx->local->sta_scanning != 0) &&
225 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
226 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
227 return TXRX_DROP;
228
229 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
230 return TXRX_CONTINUE;
231
232 sta_flags = tx->sta ? tx->sta->flags : 0;
233
234 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
235 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
236 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
237 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
238 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 printk(KERN_DEBUG "%s: dropped data frame to not "
240 "associated station " MAC_FMT "\n",
241 tx->dev->name, MAC_ARG(hdr->addr1));
242 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
243 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
244 return TXRX_DROP;
245 }
246 } else {
247 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
248 tx->local->num_sta == 0 &&
249 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
250 /*
251 * No associated STAs - no need to send multicast
252 * frames.
253 */
254 return TXRX_DROP;
255 }
256 return TXRX_CONTINUE;
257 }
258
259 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
260 !(sta_flags & WLAN_STA_AUTHORIZED))) {
261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
263 " (unauthorized port)\n", tx->dev->name,
264 MAC_ARG(hdr->addr1));
265 #endif
266 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
267 return TXRX_DROP;
268 }
269
270 return TXRX_CONTINUE;
271 }
272
273 static ieee80211_txrx_result
274 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
275 {
276 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
277
278 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
279 ieee80211_include_sequence(tx->sdata, hdr);
280
281 return TXRX_CONTINUE;
282 }
283
284 /* This function is called whenever the AP is about to exceed the maximum limit
285 * of buffered frames for power saving STAs. This situation should not really
286 * happen often during normal operation, so dropping the oldest buffered packet
287 * from each queue should be OK to make some room for new frames. */
288 static void purge_old_ps_buffers(struct ieee80211_local *local)
289 {
290 int total = 0, purged = 0;
291 struct sk_buff *skb;
292 struct ieee80211_sub_if_data *sdata;
293 struct sta_info *sta;
294
295 read_lock(&local->sub_if_lock);
296 list_for_each_entry(sdata, &local->sub_if_list, list) {
297 struct ieee80211_if_ap *ap;
298 if (sdata->dev == local->mdev ||
299 sdata->type != IEEE80211_IF_TYPE_AP)
300 continue;
301 ap = &sdata->u.ap;
302 skb = skb_dequeue(&ap->ps_bc_buf);
303 if (skb) {
304 purged++;
305 dev_kfree_skb(skb);
306 }
307 total += skb_queue_len(&ap->ps_bc_buf);
308 }
309 read_unlock(&local->sub_if_lock);
310
311 read_lock_bh(&local->sta_lock);
312 list_for_each_entry(sta, &local->sta_list, list) {
313 skb = skb_dequeue(&sta->ps_tx_buf);
314 if (skb) {
315 purged++;
316 dev_kfree_skb(skb);
317 }
318 total += skb_queue_len(&sta->ps_tx_buf);
319 }
320 read_unlock_bh(&local->sta_lock);
321
322 local->total_ps_buffered = total;
323 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
324 local->mdev->name, purged);
325 }
326
327 static inline ieee80211_txrx_result
328 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
329 {
330 /* broadcast/multicast frame */
331 /* If any of the associated stations is in power save mode,
332 * the frame is buffered to be sent after DTIM beacon frame */
333 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
334 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
335 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
336 !(tx->fc & IEEE80211_FCTL_ORDER)) {
337 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
338 purge_old_ps_buffers(tx->local);
339 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
340 AP_MAX_BC_BUFFER) {
341 if (net_ratelimit()) {
342 printk(KERN_DEBUG "%s: BC TX buffer full - "
343 "dropping the oldest frame\n",
344 tx->dev->name);
345 }
346 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
347 } else
348 tx->local->total_ps_buffered++;
349 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
350 return TXRX_QUEUED;
351 }
352
353 return TXRX_CONTINUE;
354 }
355
356 static inline ieee80211_txrx_result
357 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
358 {
359 struct sta_info *sta = tx->sta;
360
361 if (unlikely(!sta ||
362 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
363 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
364 return TXRX_CONTINUE;
365
366 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
367 struct ieee80211_tx_packet_data *pkt_data;
368 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
369 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
370 "before %d)\n",
371 MAC_ARG(sta->addr), sta->aid,
372 skb_queue_len(&sta->ps_tx_buf));
373 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
374 sta->flags |= WLAN_STA_TIM;
375 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
376 purge_old_ps_buffers(tx->local);
377 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
378 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
379 if (net_ratelimit()) {
380 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
381 "buffer full - dropping oldest frame\n",
382 tx->dev->name, MAC_ARG(sta->addr));
383 }
384 dev_kfree_skb(old);
385 } else
386 tx->local->total_ps_buffered++;
387 /* Queue frame to be sent after STA sends an PS Poll frame */
388 if (skb_queue_empty(&sta->ps_tx_buf)) {
389 if (tx->local->ops->set_tim)
390 tx->local->ops->set_tim(local_to_hw(tx->local),
391 sta->aid, 1);
392 if (tx->sdata->bss)
393 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
394 }
395 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
396 pkt_data->jiffies = jiffies;
397 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
398 return TXRX_QUEUED;
399 }
400 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 else if (unlikely(sta->flags & WLAN_STA_PS)) {
402 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
403 "set -> send frame\n", tx->dev->name,
404 MAC_ARG(sta->addr));
405 }
406 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
407 sta->pspoll = 0;
408
409 return TXRX_CONTINUE;
410 }
411
412
413 static ieee80211_txrx_result
414 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
415 {
416 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
417 return TXRX_CONTINUE;
418
419 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
420 return ieee80211_tx_h_unicast_ps_buf(tx);
421 else
422 return ieee80211_tx_h_multicast_ps_buf(tx);
423 }
424
425
426
427
428 static ieee80211_txrx_result
429 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
430 {
431 struct ieee80211_key *key;
432
433 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
434
435 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
436 tx->key = NULL;
437 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
438 tx->key = key;
439 else if ((key = rcu_dereference(tx->sdata->default_key)))
440 tx->key = key;
441 else if (tx->sdata->drop_unencrypted &&
442 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
443 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
444 return TXRX_DROP;
445 } else
446 tx->key = NULL;
447
448 if (tx->key) {
449 tx->key->tx_rx_count++;
450 if (unlikely(tx->local->key_tx_rx_threshold &&
451 tx->key->tx_rx_count >
452 tx->local->key_tx_rx_threshold)) {
453 ieee80211_key_threshold_notify(tx->dev, tx->key,
454 tx->sta);
455 }
456 }
457
458 return TXRX_CONTINUE;
459 }
460
461 static ieee80211_txrx_result
462 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
463 {
464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
465 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
466 struct sk_buff **frags, *first, *frag;
467 int i;
468 u16 seq;
469 u8 *pos;
470 int frag_threshold = tx->local->fragmentation_threshold;
471
472 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
473 return TXRX_CONTINUE;
474
475 first = tx->skb;
476
477 hdrlen = ieee80211_get_hdrlen(tx->fc);
478 payload_len = first->len - hdrlen;
479 per_fragm = frag_threshold - hdrlen - FCS_LEN;
480 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
481
482 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
483 if (!frags)
484 goto fail;
485
486 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
487 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
488 pos = first->data + hdrlen + per_fragm;
489 left = payload_len - per_fragm;
490 for (i = 0; i < num_fragm - 1; i++) {
491 struct ieee80211_hdr *fhdr;
492 size_t copylen;
493
494 if (left <= 0)
495 goto fail;
496
497 /* reserve enough extra head and tail room for possible
498 * encryption */
499 frag = frags[i] =
500 dev_alloc_skb(tx->local->tx_headroom +
501 frag_threshold +
502 IEEE80211_ENCRYPT_HEADROOM +
503 IEEE80211_ENCRYPT_TAILROOM);
504 if (!frag)
505 goto fail;
506 /* Make sure that all fragments use the same priority so
507 * that they end up using the same TX queue */
508 frag->priority = first->priority;
509 skb_reserve(frag, tx->local->tx_headroom +
510 IEEE80211_ENCRYPT_HEADROOM);
511 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
512 memcpy(fhdr, first->data, hdrlen);
513 if (i == num_fragm - 2)
514 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
515 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
516 copylen = left > per_fragm ? per_fragm : left;
517 memcpy(skb_put(frag, copylen), pos, copylen);
518
519 pos += copylen;
520 left -= copylen;
521 }
522 skb_trim(first, hdrlen + per_fragm);
523
524 tx->u.tx.num_extra_frag = num_fragm - 1;
525 tx->u.tx.extra_frag = frags;
526
527 return TXRX_CONTINUE;
528
529 fail:
530 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
531 if (frags) {
532 for (i = 0; i < num_fragm - 1; i++)
533 if (frags[i])
534 dev_kfree_skb(frags[i]);
535 kfree(frags);
536 }
537 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
538 return TXRX_DROP;
539 }
540
541 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
542 {
543 if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
544 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
545 return -1;
546 } else {
547 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
548 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
549 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
550 NULL)
551 return -1;
552 }
553 }
554 return 0;
555 }
556
557 static ieee80211_txrx_result
558 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
559 {
560 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
561 u16 fc;
562
563 fc = le16_to_cpu(hdr->frame_control);
564
565 if (!tx->key || tx->key->conf.alg != ALG_WEP ||
566 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
567 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
568 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
569 return TXRX_CONTINUE;
570
571 tx->u.tx.control->iv_len = WEP_IV_LEN;
572 tx->u.tx.control->icv_len = WEP_ICV_LEN;
573 ieee80211_tx_set_iswep(tx);
574
575 if (wep_encrypt_skb(tx, tx->skb) < 0) {
576 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
577 return TXRX_DROP;
578 }
579
580 if (tx->u.tx.extra_frag) {
581 int i;
582 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
583 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
584 I802_DEBUG_INC(tx->local->
585 tx_handlers_drop_wep);
586 return TXRX_DROP;
587 }
588 }
589 }
590
591 return TXRX_CONTINUE;
592 }
593
594 static ieee80211_txrx_result
595 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
596 {
597 struct rate_control_extra extra;
598
599 memset(&extra, 0, sizeof(extra));
600 extra.mode = tx->u.tx.mode;
601 extra.mgmt_data = tx->sdata &&
602 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
603 extra.ethertype = tx->ethertype;
604
605 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
606 &extra);
607 if (unlikely(extra.probe != NULL)) {
608 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
609 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
610 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
611 tx->u.tx.rate = extra.probe;
612 } else {
613 tx->u.tx.control->alt_retry_rate = -1;
614 }
615 if (!tx->u.tx.rate)
616 return TXRX_DROP;
617 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
618 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
619 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
620 tx->u.tx.last_frag_rate = tx->u.tx.rate;
621 if (extra.probe)
622 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
623 else
624 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
625 tx->u.tx.rate = extra.nonerp;
626 tx->u.tx.control->rate = extra.nonerp;
627 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
628 } else {
629 tx->u.tx.last_frag_rate = tx->u.tx.rate;
630 tx->u.tx.control->rate = tx->u.tx.rate;
631 }
632 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
633
634 return TXRX_CONTINUE;
635 }
636
637 static ieee80211_txrx_result
638 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
639 {
640 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
641 u16 fc = le16_to_cpu(hdr->frame_control);
642 u16 dur;
643 struct ieee80211_tx_control *control = tx->u.tx.control;
644 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
645
646 if (!is_multicast_ether_addr(hdr->addr1)) {
647 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
648 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
649 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
650 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
651 control->retry_limit =
652 tx->local->long_retry_limit;
653 } else {
654 control->retry_limit =
655 tx->local->short_retry_limit;
656 }
657 } else {
658 control->retry_limit = 1;
659 }
660
661 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
662 /* Do not use multiple retry rates when sending fragmented
663 * frames.
664 * TODO: The last fragment could still use multiple retry
665 * rates. */
666 control->alt_retry_rate = -1;
667 }
668
669 /* Use CTS protection for unicast frames sent using extended rates if
670 * there are associated non-ERP stations and RTS/CTS is not configured
671 * for the frame. */
672 if (mode->mode == MODE_IEEE80211G &&
673 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
674 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
675 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
676 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
677 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
678
679 /* Transmit data frames using short preambles if the driver supports
680 * short preambles at the selected rate and short preambles are
681 * available on the network at the current point in time. */
682 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
683 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
684 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
685 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
686 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
687 }
688
689 /* Setup duration field for the first fragment of the frame. Duration
690 * for remaining fragments will be updated when they are being sent
691 * to low-level driver in ieee80211_tx(). */
692 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
693 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
694 tx->u.tx.extra_frag[0]->len : 0);
695 hdr->duration_id = cpu_to_le16(dur);
696
697 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
698 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
699 struct ieee80211_rate *rate;
700
701 /* Do not use multiple retry rates when using RTS/CTS */
702 control->alt_retry_rate = -1;
703
704 /* Use min(data rate, max base rate) as CTS/RTS rate */
705 rate = tx->u.tx.rate;
706 while (rate > mode->rates &&
707 !(rate->flags & IEEE80211_RATE_BASIC))
708 rate--;
709
710 control->rts_cts_rate = rate->val;
711 control->rts_rate = rate;
712 }
713
714 if (tx->sta) {
715 tx->sta->tx_packets++;
716 tx->sta->tx_fragments++;
717 tx->sta->tx_bytes += tx->skb->len;
718 if (tx->u.tx.extra_frag) {
719 int i;
720 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
721 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
722 tx->sta->tx_bytes +=
723 tx->u.tx.extra_frag[i]->len;
724 }
725 }
726 }
727
728 return TXRX_CONTINUE;
729 }
730
731 static ieee80211_txrx_result
732 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
733 {
734 struct ieee80211_local *local = tx->local;
735 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
736 struct sk_buff *skb = tx->skb;
737 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
738 u32 load = 0, hdrtime;
739
740 /* TODO: this could be part of tx_status handling, so that the number
741 * of retries would be known; TX rate should in that case be stored
742 * somewhere with the packet */
743
744 /* Estimate total channel use caused by this frame */
745
746 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
747 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
748
749 if (mode->mode == MODE_IEEE80211A ||
750 (mode->mode == MODE_IEEE80211G &&
751 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
752 hdrtime = CHAN_UTIL_HDR_SHORT;
753 else
754 hdrtime = CHAN_UTIL_HDR_LONG;
755
756 load = hdrtime;
757 if (!is_multicast_ether_addr(hdr->addr1))
758 load += hdrtime;
759
760 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
761 load += 2 * hdrtime;
762 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
763 load += hdrtime;
764
765 load += skb->len * tx->u.tx.rate->rate_inv;
766
767 if (tx->u.tx.extra_frag) {
768 int i;
769 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
770 load += 2 * hdrtime;
771 load += tx->u.tx.extra_frag[i]->len *
772 tx->u.tx.rate->rate;
773 }
774 }
775
776 /* Divide channel_use by 8 to avoid wrapping around the counter */
777 load >>= CHAN_UTIL_SHIFT;
778 local->channel_use_raw += load;
779 if (tx->sta)
780 tx->sta->channel_use_raw += load;
781 tx->sdata->channel_use_raw += load;
782
783 return TXRX_CONTINUE;
784 }
785
786 /* TODO: implement register/unregister functions for adding TX/RX handlers
787 * into ordered list */
788
789 ieee80211_tx_handler ieee80211_tx_handlers[] =
790 {
791 ieee80211_tx_h_check_assoc,
792 ieee80211_tx_h_sequence,
793 ieee80211_tx_h_ps_buf,
794 ieee80211_tx_h_select_key,
795 ieee80211_tx_h_michael_mic_add,
796 ieee80211_tx_h_fragment,
797 ieee80211_tx_h_tkip_encrypt,
798 ieee80211_tx_h_ccmp_encrypt,
799 ieee80211_tx_h_wep_encrypt,
800 ieee80211_tx_h_rate_ctrl,
801 ieee80211_tx_h_misc,
802 ieee80211_tx_h_load_stats,
803 NULL
804 };
805
806 /* actual transmit path */
807
808 /*
809 * deal with packet injection down monitor interface
810 * with Radiotap Header -- only called for monitor mode interface
811 */
812 static ieee80211_txrx_result
813 __ieee80211_parse_tx_radiotap(
814 struct ieee80211_txrx_data *tx,
815 struct sk_buff *skb, struct ieee80211_tx_control *control)
816 {
817 /*
818 * this is the moment to interpret and discard the radiotap header that
819 * must be at the start of the packet injected in Monitor mode
820 *
821 * Need to take some care with endian-ness since radiotap
822 * args are little-endian
823 */
824
825 struct ieee80211_radiotap_iterator iterator;
826 struct ieee80211_radiotap_header *rthdr =
827 (struct ieee80211_radiotap_header *) skb->data;
828 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
829 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
830
831 /*
832 * default control situation for all injected packets
833 * FIXME: this does not suit all usage cases, expand to allow control
834 */
835
836 control->retry_limit = 1; /* no retry */
837 control->key_idx = HW_KEY_IDX_INVALID;
838 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
839 IEEE80211_TXCTL_USE_CTS_PROTECT);
840 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
841 IEEE80211_TXCTL_NO_ACK;
842 control->antenna_sel_tx = 0; /* default to default antenna */
843
844 /*
845 * for every radiotap entry that is present
846 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
847 * entries present, or -EINVAL on error)
848 */
849
850 while (!ret) {
851 int i, target_rate;
852
853 ret = ieee80211_radiotap_iterator_next(&iterator);
854
855 if (ret)
856 continue;
857
858 /* see if this argument is something we can use */
859 switch (iterator.this_arg_index) {
860 /*
861 * You must take care when dereferencing iterator.this_arg
862 * for multibyte types... the pointer is not aligned. Use
863 * get_unaligned((type *)iterator.this_arg) to dereference
864 * iterator.this_arg for type "type" safely on all arches.
865 */
866 case IEEE80211_RADIOTAP_RATE:
867 /*
868 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
869 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
870 */
871 target_rate = (*iterator.this_arg) * 5;
872 for (i = 0; i < mode->num_rates; i++) {
873 struct ieee80211_rate *r = &mode->rates[i];
874
875 if (r->rate > target_rate)
876 continue;
877
878 control->rate = r;
879
880 if (r->flags & IEEE80211_RATE_PREAMBLE2)
881 control->tx_rate = r->val2;
882 else
883 control->tx_rate = r->val;
884
885 /* end on exact match */
886 if (r->rate == target_rate)
887 i = mode->num_rates;
888 }
889 break;
890
891 case IEEE80211_RADIOTAP_ANTENNA:
892 /*
893 * radiotap uses 0 for 1st ant, mac80211 is 1 for
894 * 1st ant
895 */
896 control->antenna_sel_tx = (*iterator.this_arg) + 1;
897 break;
898
899 case IEEE80211_RADIOTAP_DBM_TX_POWER:
900 control->power_level = *iterator.this_arg;
901 break;
902
903 case IEEE80211_RADIOTAP_FLAGS:
904 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
905 /*
906 * this indicates that the skb we have been
907 * handed has the 32-bit FCS CRC at the end...
908 * we should react to that by snipping it off
909 * because it will be recomputed and added
910 * on transmission
911 */
912 if (skb->len < (iterator.max_length + FCS_LEN))
913 return TXRX_DROP;
914
915 skb_trim(skb, skb->len - FCS_LEN);
916 }
917 break;
918
919 default:
920 break;
921 }
922 }
923
924 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
925 return TXRX_DROP;
926
927 /*
928 * remove the radiotap header
929 * iterator->max_length was sanity-checked against
930 * skb->len by iterator init
931 */
932 skb_pull(skb, iterator.max_length);
933
934 return TXRX_CONTINUE;
935 }
936
937 static ieee80211_txrx_result inline
938 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
939 struct sk_buff *skb,
940 struct net_device *dev,
941 struct ieee80211_tx_control *control)
942 {
943 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
944 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
945 struct ieee80211_sub_if_data *sdata;
946 ieee80211_txrx_result res = TXRX_CONTINUE;
947
948 int hdrlen;
949
950 memset(tx, 0, sizeof(*tx));
951 tx->skb = skb;
952 tx->dev = dev; /* use original interface */
953 tx->local = local;
954 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
955 tx->sta = sta_info_get(local, hdr->addr1);
956 tx->fc = le16_to_cpu(hdr->frame_control);
957
958 /*
959 * set defaults for things that can be set by
960 * injected radiotap headers
961 */
962 control->power_level = local->hw.conf.power_level;
963 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
964
965 /* process and remove the injection radiotap header */
966 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
967 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
968 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
969 TXRX_DROP) {
970 return TXRX_DROP;
971 }
972 /*
973 * we removed the radiotap header after this point,
974 * we filled control with what we could use
975 * set to the actual ieee header now
976 */
977 hdr = (struct ieee80211_hdr *) skb->data;
978 res = TXRX_QUEUED; /* indication it was monitor packet */
979 }
980
981 tx->u.tx.control = control;
982 if (is_multicast_ether_addr(hdr->addr1)) {
983 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
984 control->flags |= IEEE80211_TXCTL_NO_ACK;
985 } else {
986 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
987 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
988 }
989 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
990 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
991 skb->len + FCS_LEN > local->fragmentation_threshold &&
992 !local->ops->set_frag_threshold)
993 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
994 else
995 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
996 if (!tx->sta)
997 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
998 else if (tx->sta->clear_dst_mask) {
999 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1000 tx->sta->clear_dst_mask = 0;
1001 }
1002 hdrlen = ieee80211_get_hdrlen(tx->fc);
1003 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1004 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1005 tx->ethertype = (pos[0] << 8) | pos[1];
1006 }
1007 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1008
1009 return res;
1010 }
1011
1012 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1013 * finished with it. */
1014 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1015 struct sk_buff *skb,
1016 struct net_device *mdev,
1017 struct ieee80211_tx_control *control)
1018 {
1019 struct ieee80211_tx_packet_data *pkt_data;
1020 struct net_device *dev;
1021
1022 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1023 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1024 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1025 dev_put(dev);
1026 dev = NULL;
1027 }
1028 if (unlikely(!dev))
1029 return -ENODEV;
1030 __ieee80211_tx_prepare(tx, skb, dev, control);
1031 return 0;
1032 }
1033
1034 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1035 struct ieee80211_txrx_data *tx)
1036 {
1037 struct ieee80211_tx_control *control = tx->u.tx.control;
1038 int ret, i;
1039
1040 if (!ieee80211_qdisc_installed(local->mdev) &&
1041 __ieee80211_queue_stopped(local, 0)) {
1042 netif_stop_queue(local->mdev);
1043 return IEEE80211_TX_AGAIN;
1044 }
1045 if (skb) {
1046 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1047 ret = local->ops->tx(local_to_hw(local), skb, control);
1048 if (ret)
1049 return IEEE80211_TX_AGAIN;
1050 local->mdev->trans_start = jiffies;
1051 ieee80211_led_tx(local, 1);
1052 }
1053 if (tx->u.tx.extra_frag) {
1054 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1055 IEEE80211_TXCTL_USE_CTS_PROTECT |
1056 IEEE80211_TXCTL_CLEAR_DST_MASK |
1057 IEEE80211_TXCTL_FIRST_FRAGMENT);
1058 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1059 if (!tx->u.tx.extra_frag[i])
1060 continue;
1061 if (__ieee80211_queue_stopped(local, control->queue))
1062 return IEEE80211_TX_FRAG_AGAIN;
1063 if (i == tx->u.tx.num_extra_frag) {
1064 control->tx_rate = tx->u.tx.last_frag_hwrate;
1065 control->rate = tx->u.tx.last_frag_rate;
1066 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1067 control->flags |=
1068 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1069 else
1070 control->flags &=
1071 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1072 }
1073
1074 ieee80211_dump_frame(local->mdev->name,
1075 "TX to low-level driver",
1076 tx->u.tx.extra_frag[i]);
1077 ret = local->ops->tx(local_to_hw(local),
1078 tx->u.tx.extra_frag[i],
1079 control);
1080 if (ret)
1081 return IEEE80211_TX_FRAG_AGAIN;
1082 local->mdev->trans_start = jiffies;
1083 ieee80211_led_tx(local, 1);
1084 tx->u.tx.extra_frag[i] = NULL;
1085 }
1086 kfree(tx->u.tx.extra_frag);
1087 tx->u.tx.extra_frag = NULL;
1088 }
1089 return IEEE80211_TX_OK;
1090 }
1091
1092 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1093 struct ieee80211_tx_control *control, int mgmt)
1094 {
1095 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1096 struct sta_info *sta;
1097 ieee80211_tx_handler *handler;
1098 struct ieee80211_txrx_data tx;
1099 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1100 int ret, i;
1101
1102 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1103
1104 if (unlikely(skb->len < 10)) {
1105 dev_kfree_skb(skb);
1106 return 0;
1107 }
1108
1109 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1110
1111 if (res_prepare == TXRX_DROP) {
1112 dev_kfree_skb(skb);
1113 return 0;
1114 }
1115
1116 /*
1117 * key references are protected using RCU and this requires that
1118 * we are in a read-site RCU section during receive processing
1119 */
1120 rcu_read_lock();
1121
1122 sta = tx.sta;
1123 tx.u.tx.mgmt_interface = mgmt;
1124 tx.u.tx.mode = local->hw.conf.mode;
1125
1126 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1127 res = TXRX_CONTINUE;
1128 } else {
1129 for (handler = local->tx_handlers; *handler != NULL;
1130 handler++) {
1131 res = (*handler)(&tx);
1132 if (res != TXRX_CONTINUE)
1133 break;
1134 }
1135 }
1136
1137 skb = tx.skb; /* handlers are allowed to change skb */
1138
1139 if (sta)
1140 sta_info_put(sta);
1141
1142 if (unlikely(res == TXRX_DROP)) {
1143 I802_DEBUG_INC(local->tx_handlers_drop);
1144 goto drop;
1145 }
1146
1147 if (unlikely(res == TXRX_QUEUED)) {
1148 I802_DEBUG_INC(local->tx_handlers_queued);
1149 rcu_read_unlock();
1150 return 0;
1151 }
1152
1153 if (tx.u.tx.extra_frag) {
1154 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1155 int next_len, dur;
1156 struct ieee80211_hdr *hdr =
1157 (struct ieee80211_hdr *)
1158 tx.u.tx.extra_frag[i]->data;
1159
1160 if (i + 1 < tx.u.tx.num_extra_frag) {
1161 next_len = tx.u.tx.extra_frag[i + 1]->len;
1162 } else {
1163 next_len = 0;
1164 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1165 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1166 }
1167 dur = ieee80211_duration(&tx, 0, next_len);
1168 hdr->duration_id = cpu_to_le16(dur);
1169 }
1170 }
1171
1172 retry:
1173 ret = __ieee80211_tx(local, skb, &tx);
1174 if (ret) {
1175 struct ieee80211_tx_stored_packet *store =
1176 &local->pending_packet[control->queue];
1177
1178 if (ret == IEEE80211_TX_FRAG_AGAIN)
1179 skb = NULL;
1180 set_bit(IEEE80211_LINK_STATE_PENDING,
1181 &local->state[control->queue]);
1182 smp_mb();
1183 /* When the driver gets out of buffers during sending of
1184 * fragments and calls ieee80211_stop_queue, there is
1185 * a small window between IEEE80211_LINK_STATE_XOFF and
1186 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1187 * gets available in that window (i.e. driver calls
1188 * ieee80211_wake_queue), we would end up with ieee80211_tx
1189 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1190 * continuing transmitting here when that situation is
1191 * possible to have happened. */
1192 if (!__ieee80211_queue_stopped(local, control->queue)) {
1193 clear_bit(IEEE80211_LINK_STATE_PENDING,
1194 &local->state[control->queue]);
1195 goto retry;
1196 }
1197 memcpy(&store->control, control,
1198 sizeof(struct ieee80211_tx_control));
1199 store->skb = skb;
1200 store->extra_frag = tx.u.tx.extra_frag;
1201 store->num_extra_frag = tx.u.tx.num_extra_frag;
1202 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1203 store->last_frag_rate = tx.u.tx.last_frag_rate;
1204 store->last_frag_rate_ctrl_probe =
1205 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1206 }
1207 rcu_read_unlock();
1208 return 0;
1209
1210 drop:
1211 if (skb)
1212 dev_kfree_skb(skb);
1213 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1214 if (tx.u.tx.extra_frag[i])
1215 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1216 kfree(tx.u.tx.extra_frag);
1217 rcu_read_unlock();
1218 return 0;
1219 }
1220
1221 /* device xmit handlers */
1222
1223 int ieee80211_master_start_xmit(struct sk_buff *skb,
1224 struct net_device *dev)
1225 {
1226 struct ieee80211_tx_control control;
1227 struct ieee80211_tx_packet_data *pkt_data;
1228 struct net_device *odev = NULL;
1229 struct ieee80211_sub_if_data *osdata;
1230 int headroom;
1231 int ret;
1232
1233 /*
1234 * copy control out of the skb so other people can use skb->cb
1235 */
1236 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1237 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1238
1239 if (pkt_data->ifindex)
1240 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1241 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1242 dev_put(odev);
1243 odev = NULL;
1244 }
1245 if (unlikely(!odev)) {
1246 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1247 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1248 "originating device\n", dev->name);
1249 #endif
1250 dev_kfree_skb(skb);
1251 return 0;
1252 }
1253 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1254
1255 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1256 if (skb_headroom(skb) < headroom) {
1257 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1258 dev_kfree_skb(skb);
1259 dev_put(odev);
1260 return 0;
1261 }
1262 }
1263
1264 control.ifindex = odev->ifindex;
1265 control.type = osdata->type;
1266 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1267 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1268 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1269 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1270 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1271 control.flags |= IEEE80211_TXCTL_REQUEUE;
1272 control.queue = pkt_data->queue;
1273
1274 ret = ieee80211_tx(odev, skb, &control,
1275 control.type == IEEE80211_IF_TYPE_MGMT);
1276 dev_put(odev);
1277
1278 return ret;
1279 }
1280
1281 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1282 struct net_device *dev)
1283 {
1284 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1285 struct ieee80211_tx_packet_data *pkt_data;
1286 struct ieee80211_radiotap_header *prthdr =
1287 (struct ieee80211_radiotap_header *)skb->data;
1288 u16 len_rthdr;
1289
1290 /* check for not even having the fixed radiotap header part */
1291 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1292 goto fail; /* too short to be possibly valid */
1293
1294 /* is it a header version we can trust to find length from? */
1295 if (unlikely(prthdr->it_version))
1296 goto fail; /* only version 0 is supported */
1297
1298 /* then there must be a radiotap header with a length we can use */
1299 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1300
1301 /* does the skb contain enough to deliver on the alleged length? */
1302 if (unlikely(skb->len < len_rthdr))
1303 goto fail; /* skb too short for claimed rt header extent */
1304
1305 skb->dev = local->mdev;
1306
1307 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1308 memset(pkt_data, 0, sizeof(*pkt_data));
1309 /* needed because we set skb device to master */
1310 pkt_data->ifindex = dev->ifindex;
1311
1312 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1313
1314 /*
1315 * fix up the pointers accounting for the radiotap
1316 * header still being in there. We are being given
1317 * a precooked IEEE80211 header so no need for
1318 * normal processing
1319 */
1320 skb_set_mac_header(skb, len_rthdr);
1321 /*
1322 * these are just fixed to the end of the rt area since we
1323 * don't have any better information and at this point, nobody cares
1324 */
1325 skb_set_network_header(skb, len_rthdr);
1326 skb_set_transport_header(skb, len_rthdr);
1327
1328 /* pass the radiotap header up to the next stage intact */
1329 dev_queue_xmit(skb);
1330 return NETDEV_TX_OK;
1331
1332 fail:
1333 dev_kfree_skb(skb);
1334 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1335 }
1336
1337 /**
1338 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1339 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1340 * @skb: packet to be sent
1341 * @dev: incoming interface
1342 *
1343 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1344 * not be freed, and caller is responsible for either retrying later or freeing
1345 * skb).
1346 *
1347 * This function takes in an Ethernet header and encapsulates it with suitable
1348 * IEEE 802.11 header based on which interface the packet is coming in. The
1349 * encapsulated packet will then be passed to master interface, wlan#.11, for
1350 * transmission (through low-level driver).
1351 */
1352 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1353 struct net_device *dev)
1354 {
1355 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1356 struct ieee80211_tx_packet_data *pkt_data;
1357 struct ieee80211_sub_if_data *sdata;
1358 int ret = 1, head_need;
1359 u16 ethertype, hdrlen, fc;
1360 struct ieee80211_hdr hdr;
1361 const u8 *encaps_data;
1362 int encaps_len, skip_header_bytes;
1363 int nh_pos, h_pos;
1364 struct sta_info *sta;
1365
1366 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1367 if (unlikely(skb->len < ETH_HLEN)) {
1368 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1369 dev->name, skb->len);
1370 ret = 0;
1371 goto fail;
1372 }
1373
1374 nh_pos = skb_network_header(skb) - skb->data;
1375 h_pos = skb_transport_header(skb) - skb->data;
1376
1377 /* convert Ethernet header to proper 802.11 header (based on
1378 * operation mode) */
1379 ethertype = (skb->data[12] << 8) | skb->data[13];
1380 /* TODO: handling for 802.1x authorized/unauthorized port */
1381 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1382
1383 switch (sdata->type) {
1384 case IEEE80211_IF_TYPE_AP:
1385 case IEEE80211_IF_TYPE_VLAN:
1386 fc |= IEEE80211_FCTL_FROMDS;
1387 /* DA BSSID SA */
1388 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1389 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1390 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1391 hdrlen = 24;
1392 break;
1393 case IEEE80211_IF_TYPE_WDS:
1394 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1395 /* RA TA DA SA */
1396 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1397 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1398 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1399 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1400 hdrlen = 30;
1401 break;
1402 case IEEE80211_IF_TYPE_STA:
1403 fc |= IEEE80211_FCTL_TODS;
1404 /* BSSID SA DA */
1405 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1406 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1407 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1408 hdrlen = 24;
1409 break;
1410 case IEEE80211_IF_TYPE_IBSS:
1411 /* DA SA BSSID */
1412 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1413 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1414 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1415 hdrlen = 24;
1416 break;
1417 default:
1418 ret = 0;
1419 goto fail;
1420 }
1421
1422 /* receiver is QoS enabled, use a QoS type frame */
1423 sta = sta_info_get(local, hdr.addr1);
1424 if (sta) {
1425 if (sta->flags & WLAN_STA_WME) {
1426 fc |= IEEE80211_STYPE_QOS_DATA;
1427 hdrlen += 2;
1428 }
1429 sta_info_put(sta);
1430 }
1431
1432 hdr.frame_control = cpu_to_le16(fc);
1433 hdr.duration_id = 0;
1434 hdr.seq_ctrl = 0;
1435
1436 skip_header_bytes = ETH_HLEN;
1437 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1438 encaps_data = bridge_tunnel_header;
1439 encaps_len = sizeof(bridge_tunnel_header);
1440 skip_header_bytes -= 2;
1441 } else if (ethertype >= 0x600) {
1442 encaps_data = rfc1042_header;
1443 encaps_len = sizeof(rfc1042_header);
1444 skip_header_bytes -= 2;
1445 } else {
1446 encaps_data = NULL;
1447 encaps_len = 0;
1448 }
1449
1450 skb_pull(skb, skip_header_bytes);
1451 nh_pos -= skip_header_bytes;
1452 h_pos -= skip_header_bytes;
1453
1454 /* TODO: implement support for fragments so that there is no need to
1455 * reallocate and copy payload; it might be enough to support one
1456 * extra fragment that would be copied in the beginning of the frame
1457 * data.. anyway, it would be nice to include this into skb structure
1458 * somehow
1459 *
1460 * There are few options for this:
1461 * use skb->cb as an extra space for 802.11 header
1462 * allocate new buffer if not enough headroom
1463 * make sure that there is enough headroom in every skb by increasing
1464 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1465 * alloc_skb() (net/core/skbuff.c)
1466 */
1467 head_need = hdrlen + encaps_len + local->tx_headroom;
1468 head_need -= skb_headroom(skb);
1469
1470 /* We are going to modify skb data, so make a copy of it if happens to
1471 * be cloned. This could happen, e.g., with Linux bridge code passing
1472 * us broadcast frames. */
1473
1474 if (head_need > 0 || skb_cloned(skb)) {
1475 #if 0
1476 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1477 "of headroom\n", dev->name, head_need);
1478 #endif
1479
1480 if (skb_cloned(skb))
1481 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1482 else
1483 I802_DEBUG_INC(local->tx_expand_skb_head);
1484 /* Since we have to reallocate the buffer, make sure that there
1485 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1486 * before payload and 12 after). */
1487 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1488 12, GFP_ATOMIC)) {
1489 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1490 "\n", dev->name);
1491 goto fail;
1492 }
1493 }
1494
1495 if (encaps_data) {
1496 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1497 nh_pos += encaps_len;
1498 h_pos += encaps_len;
1499 }
1500
1501 if (fc & IEEE80211_STYPE_QOS_DATA) {
1502 __le16 *qos_control;
1503
1504 qos_control = (__le16*) skb_push(skb, 2);
1505 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1506 /*
1507 * Maybe we could actually set some fields here, for now just
1508 * initialise to zero to indicate no special operation.
1509 */
1510 *qos_control = 0;
1511 } else
1512 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1513
1514 nh_pos += hdrlen;
1515 h_pos += hdrlen;
1516
1517 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1518 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1519 pkt_data->ifindex = dev->ifindex;
1520 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1521 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1522
1523 skb->dev = local->mdev;
1524 sdata->stats.tx_packets++;
1525 sdata->stats.tx_bytes += skb->len;
1526
1527 /* Update skb pointers to various headers since this modified frame
1528 * is going to go through Linux networking code that may potentially
1529 * need things like pointer to IP header. */
1530 skb_set_mac_header(skb, 0);
1531 skb_set_network_header(skb, nh_pos);
1532 skb_set_transport_header(skb, h_pos);
1533
1534 dev->trans_start = jiffies;
1535 dev_queue_xmit(skb);
1536
1537 return 0;
1538
1539 fail:
1540 if (!ret)
1541 dev_kfree_skb(skb);
1542
1543 return ret;
1544 }
1545
1546 /*
1547 * This is the transmit routine for the 802.11 type interfaces
1548 * called by upper layers of the linux networking
1549 * stack when it has a frame to transmit
1550 */
1551 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1552 {
1553 struct ieee80211_sub_if_data *sdata;
1554 struct ieee80211_tx_packet_data *pkt_data;
1555 struct ieee80211_hdr *hdr;
1556 u16 fc;
1557
1558 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1559
1560 if (skb->len < 10) {
1561 dev_kfree_skb(skb);
1562 return 0;
1563 }
1564
1565 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1566 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1567 0, GFP_ATOMIC)) {
1568 dev_kfree_skb(skb);
1569 return 0;
1570 }
1571 }
1572
1573 hdr = (struct ieee80211_hdr *) skb->data;
1574 fc = le16_to_cpu(hdr->frame_control);
1575
1576 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1577 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1578 pkt_data->ifindex = sdata->dev->ifindex;
1579 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1580 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1581
1582 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1583 skb->dev = sdata->local->mdev;
1584
1585 /*
1586 * We're using the protocol field of the the frame control header
1587 * to request TX callback for hostapd. BIT(1) is checked.
1588 */
1589 if ((fc & BIT(1)) == BIT(1)) {
1590 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1591 fc &= ~BIT(1);
1592 hdr->frame_control = cpu_to_le16(fc);
1593 }
1594
1595 if (!(fc & IEEE80211_FCTL_PROTECTED))
1596 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1597
1598 sdata->stats.tx_packets++;
1599 sdata->stats.tx_bytes += skb->len;
1600
1601 dev_queue_xmit(skb);
1602
1603 return 0;
1604 }
1605
1606 /* helper functions for pending packets for when queues are stopped */
1607
1608 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1609 {
1610 int i, j;
1611 struct ieee80211_tx_stored_packet *store;
1612
1613 for (i = 0; i < local->hw.queues; i++) {
1614 if (!__ieee80211_queue_pending(local, i))
1615 continue;
1616 store = &local->pending_packet[i];
1617 kfree_skb(store->skb);
1618 for (j = 0; j < store->num_extra_frag; j++)
1619 kfree_skb(store->extra_frag[j]);
1620 kfree(store->extra_frag);
1621 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1622 }
1623 }
1624
1625 void ieee80211_tx_pending(unsigned long data)
1626 {
1627 struct ieee80211_local *local = (struct ieee80211_local *)data;
1628 struct net_device *dev = local->mdev;
1629 struct ieee80211_tx_stored_packet *store;
1630 struct ieee80211_txrx_data tx;
1631 int i, ret, reschedule = 0;
1632
1633 netif_tx_lock_bh(dev);
1634 for (i = 0; i < local->hw.queues; i++) {
1635 if (__ieee80211_queue_stopped(local, i))
1636 continue;
1637 if (!__ieee80211_queue_pending(local, i)) {
1638 reschedule = 1;
1639 continue;
1640 }
1641 store = &local->pending_packet[i];
1642 tx.u.tx.control = &store->control;
1643 tx.u.tx.extra_frag = store->extra_frag;
1644 tx.u.tx.num_extra_frag = store->num_extra_frag;
1645 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1646 tx.u.tx.last_frag_rate = store->last_frag_rate;
1647 tx.flags = 0;
1648 if (store->last_frag_rate_ctrl_probe)
1649 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1650 ret = __ieee80211_tx(local, store->skb, &tx);
1651 if (ret) {
1652 if (ret == IEEE80211_TX_FRAG_AGAIN)
1653 store->skb = NULL;
1654 } else {
1655 clear_bit(IEEE80211_LINK_STATE_PENDING,
1656 &local->state[i]);
1657 reschedule = 1;
1658 }
1659 }
1660 netif_tx_unlock_bh(dev);
1661 if (reschedule) {
1662 if (!ieee80211_qdisc_installed(dev)) {
1663 if (!__ieee80211_queue_stopped(local, 0))
1664 netif_wake_queue(dev);
1665 } else
1666 netif_schedule(dev);
1667 }
1668 }
1669
1670 /* functions for drivers to get certain frames */
1671
1672 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1673 struct ieee80211_if_ap *bss,
1674 struct sk_buff *skb)
1675 {
1676 u8 *pos, *tim;
1677 int aid0 = 0;
1678 int i, have_bits = 0, n1, n2;
1679
1680 /* Generate bitmap for TIM only if there are any STAs in power save
1681 * mode. */
1682 read_lock_bh(&local->sta_lock);
1683 if (atomic_read(&bss->num_sta_ps) > 0)
1684 /* in the hope that this is faster than
1685 * checking byte-for-byte */
1686 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1687 IEEE80211_MAX_AID+1);
1688
1689 if (bss->dtim_count == 0)
1690 bss->dtim_count = bss->dtim_period - 1;
1691 else
1692 bss->dtim_count--;
1693
1694 tim = pos = (u8 *) skb_put(skb, 6);
1695 *pos++ = WLAN_EID_TIM;
1696 *pos++ = 4;
1697 *pos++ = bss->dtim_count;
1698 *pos++ = bss->dtim_period;
1699
1700 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1701 aid0 = 1;
1702
1703 if (have_bits) {
1704 /* Find largest even number N1 so that bits numbered 1 through
1705 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1706 * (N2 + 1) x 8 through 2007 are 0. */
1707 n1 = 0;
1708 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1709 if (bss->tim[i]) {
1710 n1 = i & 0xfe;
1711 break;
1712 }
1713 }
1714 n2 = n1;
1715 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1716 if (bss->tim[i]) {
1717 n2 = i;
1718 break;
1719 }
1720 }
1721
1722 /* Bitmap control */
1723 *pos++ = n1 | aid0;
1724 /* Part Virt Bitmap */
1725 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1726
1727 tim[1] = n2 - n1 + 4;
1728 skb_put(skb, n2 - n1);
1729 } else {
1730 *pos++ = aid0; /* Bitmap control */
1731 *pos++ = 0; /* Part Virt Bitmap */
1732 }
1733 read_unlock_bh(&local->sta_lock);
1734 }
1735
1736 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1737 struct ieee80211_tx_control *control)
1738 {
1739 struct ieee80211_local *local = hw_to_local(hw);
1740 struct sk_buff *skb;
1741 struct net_device *bdev;
1742 struct ieee80211_sub_if_data *sdata = NULL;
1743 struct ieee80211_if_ap *ap = NULL;
1744 struct ieee80211_rate *rate;
1745 struct rate_control_extra extra;
1746 u8 *b_head, *b_tail;
1747 int bh_len, bt_len;
1748
1749 bdev = dev_get_by_index(&init_net, if_id);
1750 if (bdev) {
1751 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1752 ap = &sdata->u.ap;
1753 dev_put(bdev);
1754 }
1755
1756 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1757 !ap->beacon_head) {
1758 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1759 if (net_ratelimit())
1760 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1761 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1762 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1763 return NULL;
1764 }
1765
1766 /* Assume we are generating the normal beacon locally */
1767 b_head = ap->beacon_head;
1768 b_tail = ap->beacon_tail;
1769 bh_len = ap->beacon_head_len;
1770 bt_len = ap->beacon_tail_len;
1771
1772 skb = dev_alloc_skb(local->tx_headroom +
1773 bh_len + bt_len + 256 /* maximum TIM len */);
1774 if (!skb)
1775 return NULL;
1776
1777 skb_reserve(skb, local->tx_headroom);
1778 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1779
1780 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1781
1782 ieee80211_beacon_add_tim(local, ap, skb);
1783
1784 if (b_tail) {
1785 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1786 }
1787
1788 if (control) {
1789 memset(&extra, 0, sizeof(extra));
1790 extra.mode = local->oper_hw_mode;
1791
1792 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1793 if (!rate) {
1794 if (net_ratelimit()) {
1795 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1796 "found\n", local->mdev->name);
1797 }
1798 dev_kfree_skb(skb);
1799 return NULL;
1800 }
1801
1802 control->tx_rate =
1803 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1804 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1805 rate->val2 : rate->val;
1806 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1807 control->power_level = local->hw.conf.power_level;
1808 control->flags |= IEEE80211_TXCTL_NO_ACK;
1809 control->retry_limit = 1;
1810 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1811 }
1812
1813 ap->num_beacons++;
1814 return skb;
1815 }
1816 EXPORT_SYMBOL(ieee80211_beacon_get);
1817
1818 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1819 const void *frame, size_t frame_len,
1820 const struct ieee80211_tx_control *frame_txctl,
1821 struct ieee80211_rts *rts)
1822 {
1823 const struct ieee80211_hdr *hdr = frame;
1824 u16 fctl;
1825
1826 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1827 rts->frame_control = cpu_to_le16(fctl);
1828 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1829 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1830 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1831 }
1832 EXPORT_SYMBOL(ieee80211_rts_get);
1833
1834 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1835 const void *frame, size_t frame_len,
1836 const struct ieee80211_tx_control *frame_txctl,
1837 struct ieee80211_cts *cts)
1838 {
1839 const struct ieee80211_hdr *hdr = frame;
1840 u16 fctl;
1841
1842 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1843 cts->frame_control = cpu_to_le16(fctl);
1844 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1845 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1846 }
1847 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1848
1849 struct sk_buff *
1850 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1851 struct ieee80211_tx_control *control)
1852 {
1853 struct ieee80211_local *local = hw_to_local(hw);
1854 struct sk_buff *skb;
1855 struct sta_info *sta;
1856 ieee80211_tx_handler *handler;
1857 struct ieee80211_txrx_data tx;
1858 ieee80211_txrx_result res = TXRX_DROP;
1859 struct net_device *bdev;
1860 struct ieee80211_sub_if_data *sdata;
1861 struct ieee80211_if_ap *bss = NULL;
1862
1863 bdev = dev_get_by_index(&init_net, if_id);
1864 if (bdev) {
1865 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1866 bss = &sdata->u.ap;
1867 dev_put(bdev);
1868 }
1869 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1870 return NULL;
1871
1872 if (bss->dtim_count != 0)
1873 return NULL; /* send buffered bc/mc only after DTIM beacon */
1874 memset(control, 0, sizeof(*control));
1875 while (1) {
1876 skb = skb_dequeue(&bss->ps_bc_buf);
1877 if (!skb)
1878 return NULL;
1879 local->total_ps_buffered--;
1880
1881 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1882 struct ieee80211_hdr *hdr =
1883 (struct ieee80211_hdr *) skb->data;
1884 /* more buffered multicast/broadcast frames ==> set
1885 * MoreData flag in IEEE 802.11 header to inform PS
1886 * STAs */
1887 hdr->frame_control |=
1888 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1889 }
1890
1891 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1892 break;
1893 dev_kfree_skb_any(skb);
1894 }
1895 sta = tx.sta;
1896 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1897
1898 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1899 res = (*handler)(&tx);
1900 if (res == TXRX_DROP || res == TXRX_QUEUED)
1901 break;
1902 }
1903 dev_put(tx.dev);
1904 skb = tx.skb; /* handlers are allowed to change skb */
1905
1906 if (res == TXRX_DROP) {
1907 I802_DEBUG_INC(local->tx_handlers_drop);
1908 dev_kfree_skb(skb);
1909 skb = NULL;
1910 } else if (res == TXRX_QUEUED) {
1911 I802_DEBUG_INC(local->tx_handlers_queued);
1912 skb = NULL;
1913 }
1914
1915 if (sta)
1916 sta_info_put(sta);
1917
1918 return skb;
1919 }
1920 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Verdex Pro support