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[MAC80211]: Add LONG_RETRY flag to ieee80211_tx_control
[net-next-2.6.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 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 <net/ieee80211_radiotap.h>
21#include <net/cfg80211.h>
22#include <net/mac80211.h>
23#include <asm/unaligned.h>
24
25#include "ieee80211_i.h"
26#include "ieee80211_led.h"
27#include "wep.h"
28#include "wpa.h"
29#include "wme.h"
30#include "ieee80211_rate.h"
31
32#define IEEE80211_TX_OK 0
33#define IEEE80211_TX_AGAIN 1
34#define IEEE80211_TX_FRAG_AGAIN 2
35
36/* misc utils */
37
38static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
39 struct ieee80211_hdr *hdr)
40{
41 /* Set the sequence number for this frame. */
42 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
43
44 /* Increase the sequence number. */
45 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
46}
47
48#ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
49static void ieee80211_dump_frame(const char *ifname, const char *title,
50 const struct sk_buff *skb)
51{
52 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
53 u16 fc;
54 int hdrlen;
55
56 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
57 if (skb->len < 4) {
58 printk("\n");
59 return;
60 }
61
62 fc = le16_to_cpu(hdr->frame_control);
63 hdrlen = ieee80211_get_hdrlen(fc);
64 if (hdrlen > skb->len)
65 hdrlen = skb->len;
66 if (hdrlen >= 4)
67 printk(" FC=0x%04x DUR=0x%04x",
68 fc, le16_to_cpu(hdr->duration_id));
69 if (hdrlen >= 10)
70 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
71 if (hdrlen >= 16)
72 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
73 if (hdrlen >= 24)
74 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
75 if (hdrlen >= 30)
76 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
77 printk("\n");
78}
79#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
80static inline void ieee80211_dump_frame(const char *ifname, const char *title,
81 struct sk_buff *skb)
82{
83}
84#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
85
86static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
87 int next_frag_len)
88{
89 int rate, mrate, erp, dur, i;
90 struct ieee80211_rate *txrate = tx->u.tx.rate;
91 struct ieee80211_local *local = tx->local;
92 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
93
94 erp = txrate->flags & IEEE80211_RATE_ERP;
95
96 /*
97 * data and mgmt (except PS Poll):
98 * - during CFP: 32768
99 * - during contention period:
100 * if addr1 is group address: 0
101 * if more fragments = 0 and addr1 is individual address: time to
102 * transmit one ACK plus SIFS
103 * if more fragments = 1 and addr1 is individual address: time to
104 * transmit next fragment plus 2 x ACK plus 3 x SIFS
105 *
106 * IEEE 802.11, 9.6:
107 * - control response frame (CTS or ACK) shall be transmitted using the
108 * same rate as the immediately previous frame in the frame exchange
109 * sequence, if this rate belongs to the PHY mandatory rates, or else
110 * at the highest possible rate belonging to the PHY rates in the
111 * BSSBasicRateSet
112 */
113
114 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
115 /* TODO: These control frames are not currently sent by
116 * 80211.o, but should they be implemented, this function
117 * needs to be updated to support duration field calculation.
118 *
119 * RTS: time needed to transmit pending data/mgmt frame plus
120 * one CTS frame plus one ACK frame plus 3 x SIFS
121 * CTS: duration of immediately previous RTS minus time
122 * required to transmit CTS and its SIFS
123 * ACK: 0 if immediately previous directed data/mgmt had
124 * more=0, with more=1 duration in ACK frame is duration
125 * from previous frame minus time needed to transmit ACK
126 * and its SIFS
127 * PS Poll: BIT(15) | BIT(14) | aid
128 */
129 return 0;
130 }
131
132 /* data/mgmt */
133 if (0 /* FIX: data/mgmt during CFP */)
134 return 32768;
135
136 if (group_addr) /* Group address as the destination - no ACK */
137 return 0;
138
139 /* Individual destination address:
140 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
141 * CTS and ACK frames shall be transmitted using the highest rate in
142 * basic rate set that is less than or equal to the rate of the
143 * immediately previous frame and that is using the same modulation
144 * (CCK or OFDM). If no basic rate set matches with these requirements,
145 * the highest mandatory rate of the PHY that is less than or equal to
146 * the rate of the previous frame is used.
147 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
148 */
149 rate = -1;
150 mrate = 10; /* use 1 Mbps if everything fails */
151 for (i = 0; i < mode->num_rates; i++) {
152 struct ieee80211_rate *r = &mode->rates[i];
153 if (r->rate > txrate->rate)
154 break;
155
156 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
157 IEEE80211_RATE_MODULATION(r->flags))
158 continue;
159
160 if (r->flags & IEEE80211_RATE_BASIC)
161 rate = r->rate;
162 else if (r->flags & IEEE80211_RATE_MANDATORY)
163 mrate = r->rate;
164 }
165 if (rate == -1) {
166 /* No matching basic rate found; use highest suitable mandatory
167 * PHY rate */
168 rate = mrate;
169 }
170
171 /* Time needed to transmit ACK
172 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
173 * to closest integer */
174
175 dur = ieee80211_frame_duration(local, 10, rate, erp,
176 local->short_preamble);
177
178 if (next_frag_len) {
179 /* Frame is fragmented: duration increases with time needed to
180 * transmit next fragment plus ACK and 2 x SIFS. */
181 dur *= 2; /* ACK + SIFS */
182 /* next fragment */
183 dur += ieee80211_frame_duration(local, next_frag_len,
184 txrate->rate, erp,
185 local->short_preamble);
186 }
187
188 return dur;
189}
190
191static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
192 int queue)
193{
194 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
195}
196
197static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
198 int queue)
199{
200 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
201}
202
203static int inline is_ieee80211_device(struct net_device *dev,
204 struct net_device *master)
205{
206 return (wdev_priv(dev->ieee80211_ptr) ==
207 wdev_priv(master->ieee80211_ptr));
208}
209
210/* tx handlers */
211
212static ieee80211_txrx_result
213ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
214{
215#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
216 struct sk_buff *skb = tx->skb;
217 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
218#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
219 u32 sta_flags;
220
221 if (unlikely(tx->local->sta_scanning != 0) &&
222 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
223 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
224 return TXRX_DROP;
225
226 if (tx->u.tx.ps_buffered)
227 return TXRX_CONTINUE;
228
229 sta_flags = tx->sta ? tx->sta->flags : 0;
230
231 if (likely(tx->u.tx.unicast)) {
232 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
233 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
234 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
235#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
236 printk(KERN_DEBUG "%s: dropped data frame to not "
237 "associated station " MAC_FMT "\n",
238 tx->dev->name, MAC_ARG(hdr->addr1));
239#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
240 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
241 return TXRX_DROP;
242 }
243 } else {
244 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
245 tx->local->num_sta == 0 &&
246 !tx->local->allow_broadcast_always &&
247 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
248 /*
249 * No associated STAs - no need to send multicast
250 * frames.
251 */
252 return TXRX_DROP;
253 }
254 return TXRX_CONTINUE;
255 }
256
257 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
258 !(sta_flags & WLAN_STA_AUTHORIZED))) {
259#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
260 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
261 " (unauthorized port)\n", tx->dev->name,
262 MAC_ARG(hdr->addr1));
263#endif
264 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
265 return TXRX_DROP;
266 }
267
268 return TXRX_CONTINUE;
269}
270
271static ieee80211_txrx_result
272ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
273{
274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
275
276 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
277 ieee80211_include_sequence(tx->sdata, hdr);
278
279 return TXRX_CONTINUE;
280}
281
282/* This function is called whenever the AP is about to exceed the maximum limit
283 * of buffered frames for power saving STAs. This situation should not really
284 * happen often during normal operation, so dropping the oldest buffered packet
285 * from each queue should be OK to make some room for new frames. */
286static void purge_old_ps_buffers(struct ieee80211_local *local)
287{
288 int total = 0, purged = 0;
289 struct sk_buff *skb;
290 struct ieee80211_sub_if_data *sdata;
291 struct sta_info *sta;
292
293 read_lock(&local->sub_if_lock);
294 list_for_each_entry(sdata, &local->sub_if_list, list) {
295 struct ieee80211_if_ap *ap;
296 if (sdata->dev == local->mdev ||
297 sdata->type != IEEE80211_IF_TYPE_AP)
298 continue;
299 ap = &sdata->u.ap;
300 skb = skb_dequeue(&ap->ps_bc_buf);
301 if (skb) {
302 purged++;
303 dev_kfree_skb(skb);
304 }
305 total += skb_queue_len(&ap->ps_bc_buf);
306 }
307 read_unlock(&local->sub_if_lock);
308
be8755e1 309 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 310 list_for_each_entry(sta, &local->sta_list, list) {
311 skb = skb_dequeue(&sta->ps_tx_buf);
312 if (skb) {
313 purged++;
314 dev_kfree_skb(skb);
315 }
316 total += skb_queue_len(&sta->ps_tx_buf);
317 }
be8755e1 318 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 319
320 local->total_ps_buffered = total;
321 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
322 local->mdev->name, purged);
323}
324
325static inline ieee80211_txrx_result
326ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
327{
328 /* broadcast/multicast frame */
329 /* If any of the associated stations is in power save mode,
330 * the frame is buffered to be sent after DTIM beacon frame */
331 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
332 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
333 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
334 !(tx->fc & IEEE80211_FCTL_ORDER)) {
335 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
336 purge_old_ps_buffers(tx->local);
337 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
338 AP_MAX_BC_BUFFER) {
339 if (net_ratelimit()) {
340 printk(KERN_DEBUG "%s: BC TX buffer full - "
341 "dropping the oldest frame\n",
342 tx->dev->name);
343 }
344 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
345 } else
346 tx->local->total_ps_buffered++;
347 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
348 return TXRX_QUEUED;
349 }
350
351 return TXRX_CONTINUE;
352}
353
354static inline ieee80211_txrx_result
355ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
356{
357 struct sta_info *sta = tx->sta;
358
359 if (unlikely(!sta ||
360 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
361 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
362 return TXRX_CONTINUE;
363
364 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
365 struct ieee80211_tx_packet_data *pkt_data;
366#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
367 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
368 "before %d)\n",
369 MAC_ARG(sta->addr), sta->aid,
370 skb_queue_len(&sta->ps_tx_buf));
371#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
372 sta->flags |= WLAN_STA_TIM;
373 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
374 purge_old_ps_buffers(tx->local);
375 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
376 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
377 if (net_ratelimit()) {
378 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
379 "buffer full - dropping oldest frame\n",
380 tx->dev->name, MAC_ARG(sta->addr));
381 }
382 dev_kfree_skb(old);
383 } else
384 tx->local->total_ps_buffered++;
385 /* Queue frame to be sent after STA sends an PS Poll frame */
386 if (skb_queue_empty(&sta->ps_tx_buf)) {
387 if (tx->local->ops->set_tim)
388 tx->local->ops->set_tim(local_to_hw(tx->local),
389 sta->aid, 1);
390 if (tx->sdata->bss)
391 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
392 }
393 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
394 pkt_data->jiffies = jiffies;
395 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
396 return TXRX_QUEUED;
397 }
398#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
399 else if (unlikely(sta->flags & WLAN_STA_PS)) {
400 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
401 "set -> send frame\n", tx->dev->name,
402 MAC_ARG(sta->addr));
403 }
404#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
405 sta->pspoll = 0;
406
407 return TXRX_CONTINUE;
408}
409
410
411static ieee80211_txrx_result
412ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
413{
414 if (unlikely(tx->u.tx.ps_buffered))
415 return TXRX_CONTINUE;
416
417 if (tx->u.tx.unicast)
418 return ieee80211_tx_h_unicast_ps_buf(tx);
419 else
420 return ieee80211_tx_h_multicast_ps_buf(tx);
421}
422
423
424
425
426static ieee80211_txrx_result
427ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
428{
429 if (tx->sta)
430 tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
431 else
432 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
433
434 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
435 tx->key = NULL;
436 else if (tx->sta && tx->sta->key)
437 tx->key = tx->sta->key;
438 else if (tx->sdata->default_key)
439 tx->key = tx->sdata->default_key;
440 else if (tx->sdata->drop_unencrypted &&
441 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
442 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
443 return TXRX_DROP;
444 } else
445 tx->key = NULL;
446
447 if (tx->key) {
448 tx->key->tx_rx_count++;
449 if (unlikely(tx->local->key_tx_rx_threshold &&
450 tx->key->tx_rx_count >
451 tx->local->key_tx_rx_threshold)) {
452 ieee80211_key_threshold_notify(tx->dev, tx->key,
453 tx->sta);
454 }
455 }
456
457 return TXRX_CONTINUE;
458}
459
460static ieee80211_txrx_result
461ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
462{
463 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
464 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
465 struct sk_buff **frags, *first, *frag;
466 int i;
467 u16 seq;
468 u8 *pos;
469 int frag_threshold = tx->local->fragmentation_threshold;
470
471 if (!tx->fragmented)
472 return TXRX_CONTINUE;
473
474 first = tx->skb;
475
476 hdrlen = ieee80211_get_hdrlen(tx->fc);
477 payload_len = first->len - hdrlen;
478 per_fragm = frag_threshold - hdrlen - FCS_LEN;
479 num_fragm = (payload_len + per_fragm - 1) / per_fragm;
480
481 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
482 if (!frags)
483 goto fail;
484
485 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
486 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
487 pos = first->data + hdrlen + per_fragm;
488 left = payload_len - per_fragm;
489 for (i = 0; i < num_fragm - 1; i++) {
490 struct ieee80211_hdr *fhdr;
491 size_t copylen;
492
493 if (left <= 0)
494 goto fail;
495
496 /* reserve enough extra head and tail room for possible
497 * encryption */
498 frag = frags[i] =
499 dev_alloc_skb(tx->local->tx_headroom +
500 frag_threshold +
501 IEEE80211_ENCRYPT_HEADROOM +
502 IEEE80211_ENCRYPT_TAILROOM);
503 if (!frag)
504 goto fail;
505 /* Make sure that all fragments use the same priority so
506 * that they end up using the same TX queue */
507 frag->priority = first->priority;
508 skb_reserve(frag, tx->local->tx_headroom +
509 IEEE80211_ENCRYPT_HEADROOM);
510 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
511 memcpy(fhdr, first->data, hdrlen);
512 if (i == num_fragm - 2)
513 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
514 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
515 copylen = left > per_fragm ? per_fragm : left;
516 memcpy(skb_put(frag, copylen), pos, copylen);
517
518 pos += copylen;
519 left -= copylen;
520 }
521 skb_trim(first, hdrlen + per_fragm);
522
523 tx->u.tx.num_extra_frag = num_fragm - 1;
524 tx->u.tx.extra_frag = frags;
525
526 return TXRX_CONTINUE;
527
528 fail:
529 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
530 if (frags) {
531 for (i = 0; i < num_fragm - 1; i++)
532 if (frags[i])
533 dev_kfree_skb(frags[i]);
534 kfree(frags);
535 }
536 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
537 return TXRX_DROP;
538}
539
540static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
541{
542 if (tx->key->force_sw_encrypt) {
543 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
544 return -1;
545 } else {
546 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
547 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
548 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
549 NULL)
550 return -1;
551 }
552 }
553 return 0;
554}
555
556static ieee80211_txrx_result
557ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
558{
559 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
560 u16 fc;
561
562 fc = le16_to_cpu(hdr->frame_control);
563
564 if (!tx->key || tx->key->alg != ALG_WEP ||
565 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
566 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
567 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
568 return TXRX_CONTINUE;
569
570 tx->u.tx.control->iv_len = WEP_IV_LEN;
571 tx->u.tx.control->icv_len = WEP_ICV_LEN;
572 ieee80211_tx_set_iswep(tx);
573
574 if (wep_encrypt_skb(tx, tx->skb) < 0) {
575 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
576 return TXRX_DROP;
577 }
578
579 if (tx->u.tx.extra_frag) {
580 int i;
581 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
582 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
583 I802_DEBUG_INC(tx->local->
584 tx_handlers_drop_wep);
585 return TXRX_DROP;
586 }
587 }
588 }
589
590 return TXRX_CONTINUE;
591}
592
593static ieee80211_txrx_result
594ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
595{
596 struct rate_control_extra extra;
597
598 memset(&extra, 0, sizeof(extra));
599 extra.mode = tx->u.tx.mode;
600 extra.mgmt_data = tx->sdata &&
601 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
602 extra.ethertype = tx->ethertype;
603
604 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
605 &extra);
606 if (unlikely(extra.probe != NULL)) {
607 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
608 tx->u.tx.probe_last_frag = 1;
609 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
610 tx->u.tx.rate = extra.probe;
611 } else {
612 tx->u.tx.control->alt_retry_rate = -1;
613 }
614 if (!tx->u.tx.rate)
615 return TXRX_DROP;
616 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
617 tx->sdata->use_protection && tx->fragmented &&
618 extra.nonerp) {
619 tx->u.tx.last_frag_rate = tx->u.tx.rate;
620 tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
621
622 tx->u.tx.rate = extra.nonerp;
623 tx->u.tx.control->rate = extra.nonerp;
624 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
625 } else {
626 tx->u.tx.last_frag_rate = tx->u.tx.rate;
627 tx->u.tx.control->rate = tx->u.tx.rate;
628 }
629 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
630 if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
631 tx->local->short_preamble &&
632 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
633 tx->u.tx.short_preamble = 1;
634 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
635 }
636
637 return TXRX_CONTINUE;
638}
639
640static ieee80211_txrx_result
641ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
642{
643 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
644 u16 dur;
645 struct ieee80211_tx_control *control = tx->u.tx.control;
646 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
647
648 if (!is_multicast_ether_addr(hdr->addr1)) {
649 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
650 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
651 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
d5d08def 652 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
e2ebc74d
JB		 653 control->retry_limit =
654 tx->local->long_retry_limit;
655 } else {
656 control->retry_limit =
657 tx->local->short_retry_limit;
658 }
659 } else {
660 control->retry_limit = 1;
661 }
662
663 if (tx->fragmented) {
664 /* Do not use multiple retry rates when sending fragmented
665 * frames.
666 * TODO: The last fragment could still use multiple retry
667 * rates. */
668 control->alt_retry_rate = -1;
669 }
670
671 /* Use CTS protection for unicast frames sent using extended rates if
672 * there are associated non-ERP stations and RTS/CTS is not configured
673 * for the frame. */
674 if (mode->mode == MODE_IEEE80211G &&
675 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
676 tx->u.tx.unicast && tx->sdata->use_protection &&
677 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
678 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
679
680 /* Setup duration field for the first fragment of the frame. Duration
681 * for remaining fragments will be updated when they are being sent
682 * to low-level driver in ieee80211_tx(). */
683 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
684 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
685 0);
686 hdr->duration_id = cpu_to_le16(dur);
687
688 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
689 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
690 struct ieee80211_rate *rate;
691
692 /* Do not use multiple retry rates when using RTS/CTS */
693 control->alt_retry_rate = -1;
694
695 /* Use min(data rate, max base rate) as CTS/RTS rate */
696 rate = tx->u.tx.rate;
697 while (rate > mode->rates &&
698 !(rate->flags & IEEE80211_RATE_BASIC))
699 rate--;
700
701 control->rts_cts_rate = rate->val;
702 control->rts_rate = rate;
703 }
704
705 if (tx->sta) {
706 tx->sta->tx_packets++;
707 tx->sta->tx_fragments++;
708 tx->sta->tx_bytes += tx->skb->len;
709 if (tx->u.tx.extra_frag) {
710 int i;
711 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
712 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
713 tx->sta->tx_bytes +=
714 tx->u.tx.extra_frag[i]->len;
715 }
716 }
717 }
718
719 return TXRX_CONTINUE;
720}
721
722static ieee80211_txrx_result
723ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
724{
725 struct ieee80211_local *local = tx->local;
726 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
727 struct sk_buff *skb = tx->skb;
728 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
729 u32 load = 0, hdrtime;
730
731 /* TODO: this could be part of tx_status handling, so that the number
732 * of retries would be known; TX rate should in that case be stored
733 * somewhere with the packet */
734
735 /* Estimate total channel use caused by this frame */
736
737 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
738 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
739
740 if (mode->mode == MODE_IEEE80211A ||
741 mode->mode == MODE_ATHEROS_TURBO ||
742 mode->mode == MODE_ATHEROS_TURBOG ||
743 (mode->mode == MODE_IEEE80211G &&
744 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
745 hdrtime = CHAN_UTIL_HDR_SHORT;
746 else
747 hdrtime = CHAN_UTIL_HDR_LONG;
748
749 load = hdrtime;
750 if (!is_multicast_ether_addr(hdr->addr1))
751 load += hdrtime;
752
753 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
754 load += 2 * hdrtime;
755 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
756 load += hdrtime;
757
758 load += skb->len * tx->u.tx.rate->rate_inv;
759
760 if (tx->u.tx.extra_frag) {
761 int i;
762 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
763 load += 2 * hdrtime;
764 load += tx->u.tx.extra_frag[i]->len *
765 tx->u.tx.rate->rate;
766 }
767 }
768
769 /* Divide channel_use by 8 to avoid wrapping around the counter */
770 load >>= CHAN_UTIL_SHIFT;
771 local->channel_use_raw += load;
772 if (tx->sta)
773 tx->sta->channel_use_raw += load;
774 tx->sdata->channel_use_raw += load;
775
776 return TXRX_CONTINUE;
777}
778
779/* TODO: implement register/unregister functions for adding TX/RX handlers
780 * into ordered list */
781
782ieee80211_tx_handler ieee80211_tx_handlers[] =
783{
784 ieee80211_tx_h_check_assoc,
785 ieee80211_tx_h_sequence,
786 ieee80211_tx_h_ps_buf,
787 ieee80211_tx_h_select_key,
788 ieee80211_tx_h_michael_mic_add,
789 ieee80211_tx_h_fragment,
790 ieee80211_tx_h_tkip_encrypt,
791 ieee80211_tx_h_ccmp_encrypt,
792 ieee80211_tx_h_wep_encrypt,
793 ieee80211_tx_h_rate_ctrl,
794 ieee80211_tx_h_misc,
795 ieee80211_tx_h_load_stats,
796 NULL
797};
798
799/* actual transmit path */
800
801/*
802 * deal with packet injection down monitor interface
803 * with Radiotap Header -- only called for monitor mode interface
804 */
805static ieee80211_txrx_result
806__ieee80211_parse_tx_radiotap(
807 struct ieee80211_txrx_data *tx,
808 struct sk_buff *skb, struct ieee80211_tx_control *control)
809{
810 /*
811 * this is the moment to interpret and discard the radiotap header that
812 * must be at the start of the packet injected in Monitor mode
813 *
814 * Need to take some care with endian-ness since radiotap
815 * args are little-endian
816 */
817
818 struct ieee80211_radiotap_iterator iterator;
819 struct ieee80211_radiotap_header *rthdr =
820 (struct ieee80211_radiotap_header *) skb->data;
821 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
822 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
823
824 /*
825 * default control situation for all injected packets
826 * FIXME: this does not suit all usage cases, expand to allow control
827 */
828
829 control->retry_limit = 1; /* no retry */
830 control->key_idx = -1; /* no encryption key */
831 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
832 IEEE80211_TXCTL_USE_CTS_PROTECT);
833 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
834 IEEE80211_TXCTL_NO_ACK;
835 control->antenna_sel_tx = 0; /* default to default antenna */
836
837 /*
838 * for every radiotap entry that is present
839 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
840 * entries present, or -EINVAL on error)
841 */
842
843 while (!ret) {
844 int i, target_rate;
845
846 ret = ieee80211_radiotap_iterator_next(&iterator);
847
848 if (ret)
849 continue;
850
851 /* see if this argument is something we can use */
852 switch (iterator.this_arg_index) {
853 /*
854 * You must take care when dereferencing iterator.this_arg
855 * for multibyte types... the pointer is not aligned. Use
856 * get_unaligned((type *)iterator.this_arg) to dereference
857 * iterator.this_arg for type "type" safely on all arches.
858 */
859 case IEEE80211_RADIOTAP_RATE:
860 /*
861 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
862 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
863 */
864 target_rate = (*iterator.this_arg) * 5;
865 for (i = 0; i < mode->num_rates; i++) {
866 struct ieee80211_rate *r = &mode->rates[i];
867
868 if (r->rate > target_rate)
869 continue;
870
871 control->rate = r;
872
873 if (r->flags & IEEE80211_RATE_PREAMBLE2)
874 control->tx_rate = r->val2;
875 else
876 control->tx_rate = r->val;
877
878 /* end on exact match */
879 if (r->rate == target_rate)
880 i = mode->num_rates;
881 }
882 break;
883
884 case IEEE80211_RADIOTAP_ANTENNA:
885 /*
886 * radiotap uses 0 for 1st ant, mac80211 is 1 for
887 * 1st ant
888 */
889 control->antenna_sel_tx = (*iterator.this_arg) + 1;
890 break;
891
892 case IEEE80211_RADIOTAP_DBM_TX_POWER:
893 control->power_level = *iterator.this_arg;
894 break;
895
896 case IEEE80211_RADIOTAP_FLAGS:
897 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
898 /*
899 * this indicates that the skb we have been
900 * handed has the 32-bit FCS CRC at the end...
901 * we should react to that by snipping it off
902 * because it will be recomputed and added
903 * on transmission
904 */
905 if (skb->len < (iterator.max_length + FCS_LEN))
906 return TXRX_DROP;
907
908 skb_trim(skb, skb->len - FCS_LEN);
909 }
910 break;
911
912 default:
913 break;
914 }
915 }
916
917 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
918 return TXRX_DROP;
919
920 /*
921 * remove the radiotap header
922 * iterator->max_length was sanity-checked against
923 * skb->len by iterator init
924 */
925 skb_pull(skb, iterator.max_length);
926
927 return TXRX_CONTINUE;
928}
929
930static ieee80211_txrx_result inline
931__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
932 struct sk_buff *skb,
933 struct net_device *dev,
934 struct ieee80211_tx_control *control)
935{
936 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
937 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
938 struct ieee80211_sub_if_data *sdata;
939 ieee80211_txrx_result res = TXRX_CONTINUE;
940
941 int hdrlen;
942
943 memset(tx, 0, sizeof(*tx));
944 tx->skb = skb;
945 tx->dev = dev; /* use original interface */
946 tx->local = local;
947 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
948 tx->sta = sta_info_get(local, hdr->addr1);
949 tx->fc = le16_to_cpu(hdr->frame_control);
950
951 /*
952 * set defaults for things that can be set by
953 * injected radiotap headers
954 */
955 control->power_level = local->hw.conf.power_level;
956 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
957 if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
958 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
959
960 /* process and remove the injection radiotap header */
961 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
962 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
963 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
964 TXRX_DROP) {
965 return TXRX_DROP;
966 }
967 /*
968 * we removed the radiotap header after this point,
969 * we filled control with what we could use
970 * set to the actual ieee header now
971 */
972 hdr = (struct ieee80211_hdr *) skb->data;
973 res = TXRX_QUEUED; /* indication it was monitor packet */
974 }
975
976 tx->u.tx.control = control;
977 tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
978 if (is_multicast_ether_addr(hdr->addr1))
979 control->flags |= IEEE80211_TXCTL_NO_ACK;
980 else
981 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
982 tx->fragmented = local->fragmentation_threshold <
983 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
984 skb->len + FCS_LEN > local->fragmentation_threshold &&
985 (!local->ops->set_frag_threshold);
986 if (!tx->sta)
987 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
988 else if (tx->sta->clear_dst_mask) {
989 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
990 tx->sta->clear_dst_mask = 0;
991 }
992 hdrlen = ieee80211_get_hdrlen(tx->fc);
993 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
994 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
995 tx->ethertype = (pos[0] << 8) | pos[1];
996 }
997 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
998
999 return res;
1000}
1001
1002/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1003 * finished with it. */
1004static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1005 struct sk_buff *skb,
1006 struct net_device *mdev,
1007 struct ieee80211_tx_control *control)
1008{
1009 struct ieee80211_tx_packet_data *pkt_data;
1010 struct net_device *dev;
1011
1012 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1013 dev = dev_get_by_index(pkt_data->ifindex);
1014 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1015 dev_put(dev);
1016 dev = NULL;
1017 }
1018 if (unlikely(!dev))
1019 return -ENODEV;
1020 __ieee80211_tx_prepare(tx, skb, dev, control);
1021 return 0;
1022}
1023
1024static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1025 struct ieee80211_txrx_data *tx)
1026{
1027 struct ieee80211_tx_control *control = tx->u.tx.control;
1028 int ret, i;
1029
1030 if (!ieee80211_qdisc_installed(local->mdev) &&
1031 __ieee80211_queue_stopped(local, 0)) {
1032 netif_stop_queue(local->mdev);
1033 return IEEE80211_TX_AGAIN;
1034 }
1035 if (skb) {
1036 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1037 ret = local->ops->tx(local_to_hw(local), skb, control);
1038 if (ret)
1039 return IEEE80211_TX_AGAIN;
1040 local->mdev->trans_start = jiffies;
1041 ieee80211_led_tx(local, 1);
1042 }
1043 if (tx->u.tx.extra_frag) {
1044 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1045 IEEE80211_TXCTL_USE_CTS_PROTECT |
1046 IEEE80211_TXCTL_CLEAR_DST_MASK |
1047 IEEE80211_TXCTL_FIRST_FRAGMENT);
1048 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1049 if (!tx->u.tx.extra_frag[i])
1050 continue;
1051 if (__ieee80211_queue_stopped(local, control->queue))
1052 return IEEE80211_TX_FRAG_AGAIN;
1053 if (i == tx->u.tx.num_extra_frag) {
1054 control->tx_rate = tx->u.tx.last_frag_hwrate;
1055 control->rate = tx->u.tx.last_frag_rate;
1056 if (tx->u.tx.probe_last_frag)
1057 control->flags |=
1058 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1059 else
1060 control->flags &=
1061 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1062 }
1063
1064 ieee80211_dump_frame(local->mdev->name,
1065 "TX to low-level driver",
1066 tx->u.tx.extra_frag[i]);
1067 ret = local->ops->tx(local_to_hw(local),
1068 tx->u.tx.extra_frag[i],
1069 control);
1070 if (ret)
1071 return IEEE80211_TX_FRAG_AGAIN;
1072 local->mdev->trans_start = jiffies;
1073 ieee80211_led_tx(local, 1);
1074 tx->u.tx.extra_frag[i] = NULL;
1075 }
1076 kfree(tx->u.tx.extra_frag);
1077 tx->u.tx.extra_frag = NULL;
1078 }
1079 return IEEE80211_TX_OK;
1080}
1081
1082static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1083 struct ieee80211_tx_control *control, int mgmt)
1084{
1085 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1086 struct sta_info *sta;
1087 ieee80211_tx_handler *handler;
1088 struct ieee80211_txrx_data tx;
1089 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1090 int ret, i;
1091
1092 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1093
1094 if (unlikely(skb->len < 10)) {
1095 dev_kfree_skb(skb);
1096 return 0;
1097 }
1098
1099 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1100
1101 if (res_prepare == TXRX_DROP) {
1102 dev_kfree_skb(skb);
1103 return 0;
1104 }
1105
1106 sta = tx.sta;
1107 tx.u.tx.mgmt_interface = mgmt;
1108 tx.u.tx.mode = local->hw.conf.mode;
1109
1110 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1111 res = TXRX_CONTINUE;
1112 } else {
1113 for (handler = local->tx_handlers; *handler != NULL;
1114 handler++) {
1115 res = (*handler)(&tx);
1116 if (res != TXRX_CONTINUE)
1117 break;
1118 }
1119 }
1120
1121 skb = tx.skb; /* handlers are allowed to change skb */
1122
1123 if (sta)
1124 sta_info_put(sta);
1125
1126 if (unlikely(res == TXRX_DROP)) {
1127 I802_DEBUG_INC(local->tx_handlers_drop);
1128 goto drop;
1129 }
1130
1131 if (unlikely(res == TXRX_QUEUED)) {
1132 I802_DEBUG_INC(local->tx_handlers_queued);
1133 return 0;
1134 }
1135
1136 if (tx.u.tx.extra_frag) {
1137 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1138 int next_len, dur;
1139 struct ieee80211_hdr *hdr =
1140 (struct ieee80211_hdr *)
1141 tx.u.tx.extra_frag[i]->data;
1142
1143 if (i + 1 < tx.u.tx.num_extra_frag) {
1144 next_len = tx.u.tx.extra_frag[i + 1]->len;
1145 } else {
1146 next_len = 0;
1147 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1148 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1149 }
1150 dur = ieee80211_duration(&tx, 0, next_len);
1151 hdr->duration_id = cpu_to_le16(dur);
1152 }
1153 }
1154
1155retry:
1156 ret = __ieee80211_tx(local, skb, &tx);
1157 if (ret) {
1158 struct ieee80211_tx_stored_packet *store =
1159 &local->pending_packet[control->queue];
1160
1161 if (ret == IEEE80211_TX_FRAG_AGAIN)
1162 skb = NULL;
1163 set_bit(IEEE80211_LINK_STATE_PENDING,
1164 &local->state[control->queue]);
1165 smp_mb();
1166 /* When the driver gets out of buffers during sending of
1167 * fragments and calls ieee80211_stop_queue, there is
1168 * a small window between IEEE80211_LINK_STATE_XOFF and
1169 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1170 * gets available in that window (i.e. driver calls
1171 * ieee80211_wake_queue), we would end up with ieee80211_tx
1172 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1173 * continuing transmitting here when that situation is
1174 * possible to have happened. */
1175 if (!__ieee80211_queue_stopped(local, control->queue)) {
1176 clear_bit(IEEE80211_LINK_STATE_PENDING,
1177 &local->state[control->queue]);
1178 goto retry;
1179 }
1180 memcpy(&store->control, control,
1181 sizeof(struct ieee80211_tx_control));
1182 store->skb = skb;
1183 store->extra_frag = tx.u.tx.extra_frag;
1184 store->num_extra_frag = tx.u.tx.num_extra_frag;
1185 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1186 store->last_frag_rate = tx.u.tx.last_frag_rate;
1187 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1188 }
1189 return 0;
1190
1191 drop:
1192 if (skb)
1193 dev_kfree_skb(skb);
1194 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1195 if (tx.u.tx.extra_frag[i])
1196 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1197 kfree(tx.u.tx.extra_frag);
1198 return 0;
1199}
1200
1201/* device xmit handlers */
1202
1203int ieee80211_master_start_xmit(struct sk_buff *skb,
1204 struct net_device *dev)
1205{
1206 struct ieee80211_tx_control control;
1207 struct ieee80211_tx_packet_data *pkt_data;
1208 struct net_device *odev = NULL;
1209 struct ieee80211_sub_if_data *osdata;
1210 int headroom;
1211 int ret;
1212
1213 /*
1214 * copy control out of the skb so other people can use skb->cb
1215 */
1216 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1217 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1218
1219 if (pkt_data->ifindex)
1220 odev = dev_get_by_index(pkt_data->ifindex);
1221 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1222 dev_put(odev);
1223 odev = NULL;
1224 }
1225 if (unlikely(!odev)) {
1226#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1227 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1228 "originating device\n", dev->name);
1229#endif
1230 dev_kfree_skb(skb);
1231 return 0;
1232 }
1233 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1234
1235 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1236 if (skb_headroom(skb) < headroom) {
1237 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1238 dev_kfree_skb(skb);
1239 dev_put(odev);
1240 return 0;
1241 }
1242 }
1243
1244 control.ifindex = odev->ifindex;
1245 control.type = osdata->type;
1246 if (pkt_data->req_tx_status)
1247 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1248 if (pkt_data->do_not_encrypt)
1249 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1250 if (pkt_data->requeue)
1251 control.flags |= IEEE80211_TXCTL_REQUEUE;
1252 control.queue = pkt_data->queue;
1253
1254 ret = ieee80211_tx(odev, skb, &control,
1255 control.type == IEEE80211_IF_TYPE_MGMT);
1256 dev_put(odev);
1257
1258 return ret;
1259}
1260
1261int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1262 struct net_device *dev)
1263{
1264 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1265 struct ieee80211_tx_packet_data *pkt_data;
1266 struct ieee80211_radiotap_header *prthdr =
1267 (struct ieee80211_radiotap_header *)skb->data;
1268 u16 len;
1269
1270 /*
1271 * there must be a radiotap header at the
1272 * start in this case
1273 */
1274 if (unlikely(prthdr->it_version)) {
1275 /* only version 0 is supported */
1276 dev_kfree_skb(skb);
1277 return NETDEV_TX_OK;
1278 }
1279
1280 skb->dev = local->mdev;
1281
1282 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1283 memset(pkt_data, 0, sizeof(*pkt_data));
1284 pkt_data->ifindex = dev->ifindex;
1285 pkt_data->mgmt_iface = 0;
1286 pkt_data->do_not_encrypt = 1;
1287
1288 /* above needed because we set skb device to master */
1289
1290 /*
1291 * fix up the pointers accounting for the radiotap
1292 * header still being in there. We are being given
1293 * a precooked IEEE80211 header so no need for
1294 * normal processing
1295 */
1296 len = le16_to_cpu(get_unaligned(&prthdr->it_len));
1297 skb_set_mac_header(skb, len);
1298 skb_set_network_header(skb, len + sizeof(struct ieee80211_hdr));
1299 skb_set_transport_header(skb, len + sizeof(struct ieee80211_hdr));
1300
1301 /*
1302 * pass the radiotap header up to
1303 * the next stage intact
1304 */
1305 dev_queue_xmit(skb);
1306
1307 return NETDEV_TX_OK;
1308}
1309
1310/**
1311 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1312 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1313 * @skb: packet to be sent
1314 * @dev: incoming interface
1315 *
1316 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1317 * not be freed, and caller is responsible for either retrying later or freeing
1318 * skb).
1319 *
1320 * This function takes in an Ethernet header and encapsulates it with suitable
1321 * IEEE 802.11 header based on which interface the packet is coming in. The
1322 * encapsulated packet will then be passed to master interface, wlan#.11, for
1323 * transmission (through low-level driver).
1324 */
1325int ieee80211_subif_start_xmit(struct sk_buff *skb,
1326 struct net_device *dev)
1327{
1328 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1329 struct ieee80211_tx_packet_data *pkt_data;
1330 struct ieee80211_sub_if_data *sdata;
1331 int ret = 1, head_need;
1332 u16 ethertype, hdrlen, fc;
1333 struct ieee80211_hdr hdr;
1334 const u8 *encaps_data;
1335 int encaps_len, skip_header_bytes;
1336 int nh_pos, h_pos, no_encrypt = 0;
1337 struct sta_info *sta;
1338
1339 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1340 if (unlikely(skb->len < ETH_HLEN)) {
1341 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1342 dev->name, skb->len);
1343 ret = 0;
1344 goto fail;
1345 }
1346
1347 nh_pos = skb_network_header(skb) - skb->data;
1348 h_pos = skb_transport_header(skb) - skb->data;
1349
1350 /* convert Ethernet header to proper 802.11 header (based on
1351 * operation mode) */
1352 ethertype = (skb->data[12] << 8) | skb->data[13];
1353 /* TODO: handling for 802.1x authorized/unauthorized port */
1354 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1355
1356 if (likely(sdata->type == IEEE80211_IF_TYPE_AP ||
1357 sdata->type == IEEE80211_IF_TYPE_VLAN)) {
1358 fc |= IEEE80211_FCTL_FROMDS;
1359 /* DA BSSID SA */
1360 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1361 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1362 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1363 hdrlen = 24;
1364 } else if (sdata->type == IEEE80211_IF_TYPE_WDS) {
1365 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1366 /* RA TA DA SA */
1367 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1368 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1369 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1370 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1371 hdrlen = 30;
1372 } else if (sdata->type == IEEE80211_IF_TYPE_STA) {
1373 fc |= IEEE80211_FCTL_TODS;
1374 /* BSSID SA DA */
1375 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1376 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1377 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1378 hdrlen = 24;
1379 } else if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
1380 /* DA SA BSSID */
1381 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1382 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1383 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1384 hdrlen = 24;
1385 } else {
1386 ret = 0;
1387 goto fail;
1388 }
1389
1390 /* receiver is QoS enabled, use a QoS type frame */
1391 sta = sta_info_get(local, hdr.addr1);
1392 if (sta) {
1393 if (sta->flags & WLAN_STA_WME) {
1394 fc |= IEEE80211_STYPE_QOS_DATA;
1395 hdrlen += 2;
1396 }
1397 sta_info_put(sta);
1398 }
1399
1400 hdr.frame_control = cpu_to_le16(fc);
1401 hdr.duration_id = 0;
1402 hdr.seq_ctrl = 0;
1403
1404 skip_header_bytes = ETH_HLEN;
1405 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1406 encaps_data = bridge_tunnel_header;
1407 encaps_len = sizeof(bridge_tunnel_header);
1408 skip_header_bytes -= 2;
1409 } else if (ethertype >= 0x600) {
1410 encaps_data = rfc1042_header;
1411 encaps_len = sizeof(rfc1042_header);
1412 skip_header_bytes -= 2;
1413 } else {
1414 encaps_data = NULL;
1415 encaps_len = 0;
1416 }
1417
1418 skb_pull(skb, skip_header_bytes);
1419 nh_pos -= skip_header_bytes;
1420 h_pos -= skip_header_bytes;
1421
1422 /* TODO: implement support for fragments so that there is no need to
1423 * reallocate and copy payload; it might be enough to support one
1424 * extra fragment that would be copied in the beginning of the frame
1425 * data.. anyway, it would be nice to include this into skb structure
1426 * somehow
1427 *
1428 * There are few options for this:
1429 * use skb->cb as an extra space for 802.11 header
1430 * allocate new buffer if not enough headroom
1431 * make sure that there is enough headroom in every skb by increasing
1432 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1433 * alloc_skb() (net/core/skbuff.c)
1434 */
1435 head_need = hdrlen + encaps_len + local->tx_headroom;
1436 head_need -= skb_headroom(skb);
1437
1438 /* We are going to modify skb data, so make a copy of it if happens to
1439 * be cloned. This could happen, e.g., with Linux bridge code passing
1440 * us broadcast frames. */
1441
1442 if (head_need > 0 || skb_cloned(skb)) {
1443#if 0
1444 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1445 "of headroom\n", dev->name, head_need);
1446#endif
1447
1448 if (skb_cloned(skb))
1449 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1450 else
1451 I802_DEBUG_INC(local->tx_expand_skb_head);
1452 /* Since we have to reallocate the buffer, make sure that there
1453 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1454 * before payload and 12 after). */
1455 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1456 12, GFP_ATOMIC)) {
1457 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1458 "\n", dev->name);
1459 goto fail;
1460 }
1461 }
1462
1463 if (encaps_data) {
1464 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1465 nh_pos += encaps_len;
1466 h_pos += encaps_len;
1467 }
1468 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1469 nh_pos += hdrlen;
1470 h_pos += hdrlen;
1471
1472 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1473 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1474 pkt_data->ifindex = dev->ifindex;
1475 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1476 pkt_data->do_not_encrypt = no_encrypt;
1477
1478 skb->dev = local->mdev;
1479 sdata->stats.tx_packets++;
1480 sdata->stats.tx_bytes += skb->len;
1481
1482 /* Update skb pointers to various headers since this modified frame
1483 * is going to go through Linux networking code that may potentially
1484 * need things like pointer to IP header. */
1485 skb_set_mac_header(skb, 0);
1486 skb_set_network_header(skb, nh_pos);
1487 skb_set_transport_header(skb, h_pos);
1488
1489 dev->trans_start = jiffies;
1490 dev_queue_xmit(skb);
1491
1492 return 0;
1493
1494 fail:
1495 if (!ret)
1496 dev_kfree_skb(skb);
1497
1498 return ret;
1499}
1500
1501/*
1502 * This is the transmit routine for the 802.11 type interfaces
1503 * called by upper layers of the linux networking
1504 * stack when it has a frame to transmit
1505 */
1506int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1507{
1508 struct ieee80211_sub_if_data *sdata;
1509 struct ieee80211_tx_packet_data *pkt_data;
1510 struct ieee80211_hdr *hdr;
1511 u16 fc;
1512
1513 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1514
1515 if (skb->len < 10) {
1516 dev_kfree_skb(skb);
1517 return 0;
1518 }
1519
1520 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1521 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1522 0, GFP_ATOMIC)) {
1523 dev_kfree_skb(skb);
1524 return 0;
1525 }
1526 }
1527
1528 hdr = (struct ieee80211_hdr *) skb->data;
1529 fc = le16_to_cpu(hdr->frame_control);
1530
1531 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1532 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1533 pkt_data->ifindex = sdata->dev->ifindex;
1534 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1535
1536 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1537 skb->dev = sdata->local->mdev;
1538
1539 /*
1540 * We're using the protocol field of the the frame control header
1541 * to request TX callback for hostapd. BIT(1) is checked.
1542 */
1543 if ((fc & BIT(1)) == BIT(1)) {
1544 pkt_data->req_tx_status = 1;
1545 fc &= ~BIT(1);
1546 hdr->frame_control = cpu_to_le16(fc);
1547 }
1548
1549 pkt_data->do_not_encrypt = !(fc & IEEE80211_FCTL_PROTECTED);
1550
1551 sdata->stats.tx_packets++;
1552 sdata->stats.tx_bytes += skb->len;
1553
1554 dev_queue_xmit(skb);
1555
1556 return 0;
1557}
1558
1559/* helper functions for pending packets for when queues are stopped */
1560
1561void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1562{
1563 int i, j;
1564 struct ieee80211_tx_stored_packet *store;
1565
1566 for (i = 0; i < local->hw.queues; i++) {
1567 if (!__ieee80211_queue_pending(local, i))
1568 continue;
1569 store = &local->pending_packet[i];
1570 kfree_skb(store->skb);
1571 for (j = 0; j < store->num_extra_frag; j++)
1572 kfree_skb(store->extra_frag[j]);
1573 kfree(store->extra_frag);
1574 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1575 }
1576}
1577
1578void ieee80211_tx_pending(unsigned long data)
1579{
1580 struct ieee80211_local *local = (struct ieee80211_local *)data;
1581 struct net_device *dev = local->mdev;
1582 struct ieee80211_tx_stored_packet *store;
1583 struct ieee80211_txrx_data tx;
1584 int i, ret, reschedule = 0;
1585
1586 netif_tx_lock_bh(dev);
1587 for (i = 0; i < local->hw.queues; i++) {
1588 if (__ieee80211_queue_stopped(local, i))
1589 continue;
1590 if (!__ieee80211_queue_pending(local, i)) {
1591 reschedule = 1;
1592 continue;
1593 }
1594 store = &local->pending_packet[i];
1595 tx.u.tx.control = &store->control;
1596 tx.u.tx.extra_frag = store->extra_frag;
1597 tx.u.tx.num_extra_frag = store->num_extra_frag;
1598 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1599 tx.u.tx.last_frag_rate = store->last_frag_rate;
1600 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1601 ret = __ieee80211_tx(local, store->skb, &tx);
1602 if (ret) {
1603 if (ret == IEEE80211_TX_FRAG_AGAIN)
1604 store->skb = NULL;
1605 } else {
1606 clear_bit(IEEE80211_LINK_STATE_PENDING,
1607 &local->state[i]);
1608 reschedule = 1;
1609 }
1610 }
1611 netif_tx_unlock_bh(dev);
1612 if (reschedule) {
1613 if (!ieee80211_qdisc_installed(dev)) {
1614 if (!__ieee80211_queue_stopped(local, 0))
1615 netif_wake_queue(dev);
1616 } else
1617 netif_schedule(dev);
1618 }
1619}
1620
1621/* functions for drivers to get certain frames */
1622
1623static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1624 struct ieee80211_if_ap *bss,
1625 struct sk_buff *skb)
1626{
1627 u8 *pos, *tim;
1628 int aid0 = 0;
1629 int i, have_bits = 0, n1, n2;
1630
1631 /* Generate bitmap for TIM only if there are any STAs in power save
1632 * mode. */
be8755e1 1633 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 1634 if (atomic_read(&bss->num_sta_ps) > 0)
1635 /* in the hope that this is faster than
1636 * checking byte-for-byte */
1637 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1638 IEEE80211_MAX_AID+1);
1639
1640 if (bss->dtim_count == 0)
1641 bss->dtim_count = bss->dtim_period - 1;
1642 else
1643 bss->dtim_count--;
1644
1645 tim = pos = (u8 *) skb_put(skb, 6);
1646 *pos++ = WLAN_EID_TIM;
1647 *pos++ = 4;
1648 *pos++ = bss->dtim_count;
1649 *pos++ = bss->dtim_period;
1650
1651 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1652 aid0 = 1;
1653
1654 if (have_bits) {
1655 /* Find largest even number N1 so that bits numbered 1 through
1656 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1657 * (N2 + 1) x 8 through 2007 are 0. */
1658 n1 = 0;
1659 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1660 if (bss->tim[i]) {
1661 n1 = i & 0xfe;
1662 break;
1663 }
1664 }
1665 n2 = n1;
1666 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1667 if (bss->tim[i]) {
1668 n2 = i;
1669 break;
1670 }
1671 }
1672
1673 /* Bitmap control */
1674 *pos++ = n1 | aid0;
1675 /* Part Virt Bitmap */
1676 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1677
1678 tim[1] = n2 - n1 + 4;
1679 skb_put(skb, n2 - n1);
1680 } else {
1681 *pos++ = aid0; /* Bitmap control */
1682 *pos++ = 0; /* Part Virt Bitmap */
1683 }
be8755e1 1684 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 1685}
1686
1687struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1688 struct ieee80211_tx_control *control)
1689{
1690 struct ieee80211_local *local = hw_to_local(hw);
1691 struct sk_buff *skb;
1692 struct net_device *bdev;
1693 struct ieee80211_sub_if_data *sdata = NULL;
1694 struct ieee80211_if_ap *ap = NULL;
1695 struct ieee80211_rate *rate;
1696 struct rate_control_extra extra;
1697 u8 *b_head, *b_tail;
1698 int bh_len, bt_len;
1699
1700 bdev = dev_get_by_index(if_id);
1701 if (bdev) {
1702 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1703 ap = &sdata->u.ap;
1704 dev_put(bdev);
1705 }
1706
1707 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1708 !ap->beacon_head) {
1709#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1710 if (net_ratelimit())
1711 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1712 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1713#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1714 return NULL;
1715 }
1716
1717 /* Assume we are generating the normal beacon locally */
1718 b_head = ap->beacon_head;
1719 b_tail = ap->beacon_tail;
1720 bh_len = ap->beacon_head_len;
1721 bt_len = ap->beacon_tail_len;
1722
1723 skb = dev_alloc_skb(local->tx_headroom +
1724 bh_len + bt_len + 256 /* maximum TIM len */);
1725 if (!skb)
1726 return NULL;
1727
1728 skb_reserve(skb, local->tx_headroom);
1729 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1730
1731 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1732
1733 ieee80211_beacon_add_tim(local, ap, skb);
1734
1735 if (b_tail) {
1736 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1737 }
1738
1739 if (control) {
1740 memset(&extra, 0, sizeof(extra));
1741 extra.mode = local->oper_hw_mode;
1742
1743 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1744 if (!rate) {
1745 if (net_ratelimit()) {
1746 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1747 "found\n", local->mdev->name);
1748 }
1749 dev_kfree_skb(skb);
1750 return NULL;
1751 }
1752
1753 control->tx_rate = (local->short_preamble &&
1754 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1755 rate->val2 : rate->val;
1756 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1757 control->power_level = local->hw.conf.power_level;
1758 control->flags |= IEEE80211_TXCTL_NO_ACK;
1759 control->retry_limit = 1;
1760 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1761 }
1762
1763 ap->num_beacons++;
1764 return skb;
1765}
1766EXPORT_SYMBOL(ieee80211_beacon_get);
1767
1768void ieee80211_rts_get(struct ieee80211_hw *hw,
1769 const void *frame, size_t frame_len,
1770 const struct ieee80211_tx_control *frame_txctl,
1771 struct ieee80211_rts *rts)
1772{
1773 const struct ieee80211_hdr *hdr = frame;
1774 u16 fctl;
1775
1776 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1777 rts->frame_control = cpu_to_le16(fctl);
1778 rts->duration = ieee80211_rts_duration(hw, frame_len, frame_txctl);
1779 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1780 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1781}
1782EXPORT_SYMBOL(ieee80211_rts_get);
1783
1784void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
1785 const void *frame, size_t frame_len,
1786 const struct ieee80211_tx_control *frame_txctl,
1787 struct ieee80211_cts *cts)
1788{
1789 const struct ieee80211_hdr *hdr = frame;
1790 u16 fctl;
1791
1792 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1793 cts->frame_control = cpu_to_le16(fctl);
1794 cts->duration = ieee80211_ctstoself_duration(hw, frame_len, frame_txctl);
1795 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1796}
1797EXPORT_SYMBOL(ieee80211_ctstoself_get);
1798
1799struct sk_buff *
1800ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1801 struct ieee80211_tx_control *control)
1802{
1803 struct ieee80211_local *local = hw_to_local(hw);
1804 struct sk_buff *skb;
1805 struct sta_info *sta;
1806 ieee80211_tx_handler *handler;
1807 struct ieee80211_txrx_data tx;
1808 ieee80211_txrx_result res = TXRX_DROP;
1809 struct net_device *bdev;
1810 struct ieee80211_sub_if_data *sdata;
1811 struct ieee80211_if_ap *bss = NULL;
1812
1813 bdev = dev_get_by_index(if_id);
1814 if (bdev) {
1815 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1816 bss = &sdata->u.ap;
1817 dev_put(bdev);
1818 }
1819 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1820 return NULL;
1821
1822 if (bss->dtim_count != 0)
1823 return NULL; /* send buffered bc/mc only after DTIM beacon */
1824 memset(control, 0, sizeof(*control));
1825 while (1) {
1826 skb = skb_dequeue(&bss->ps_bc_buf);
1827 if (!skb)
1828 return NULL;
1829 local->total_ps_buffered--;
1830
1831 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1832 struct ieee80211_hdr *hdr =
1833 (struct ieee80211_hdr *) skb->data;
1834 /* more buffered multicast/broadcast frames ==> set
1835 * MoreData flag in IEEE 802.11 header to inform PS
1836 * STAs */
1837 hdr->frame_control |=
1838 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1839 }
1840
1841 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1842 break;
1843 dev_kfree_skb_any(skb);
1844 }
1845 sta = tx.sta;
1846 tx.u.tx.ps_buffered = 1;
1847
1848 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1849 res = (*handler)(&tx);
1850 if (res == TXRX_DROP || res == TXRX_QUEUED)
1851 break;
1852 }
1853 dev_put(tx.dev);
1854 skb = tx.skb; /* handlers are allowed to change skb */
1855
1856 if (res == TXRX_DROP) {
1857 I802_DEBUG_INC(local->tx_handlers_drop);
1858 dev_kfree_skb(skb);
1859 skb = NULL;
1860 } else if (res == TXRX_QUEUED) {
1861 I802_DEBUG_INC(local->tx_handlers_queued);
1862 skb = NULL;
1863 }
1864
1865 if (sta)
1866 sta_info_put(sta);
1867
1868 return skb;
1869}
1870EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Clone of davem's net-next-2.6 tree