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-rw-r--r--net/mac80211/tx.c1869
1 files changed, 1869 insertions, 0 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
new file mode 100644
index 000000000000..dc128b412eab
--- /dev/null
+++ b/net/mac80211/tx.c
@@ -0,0 +1,1869 @@
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
309 spin_lock_bh(&local->sta_lock);
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 }
318 spin_unlock_bh(&local->sta_lock);
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;
652 control->retry_limit =
653 tx->local->long_retry_limit;
654 } else {
655 control->retry_limit =
656 tx->local->short_retry_limit;
657 }
658 } else {
659 control->retry_limit = 1;
660 }
661
662 if (tx->fragmented) {
663 /* Do not use multiple retry rates when sending fragmented
664 * frames.
665 * TODO: The last fragment could still use multiple retry
666 * rates. */
667 control->alt_retry_rate = -1;
668 }
669
670 /* Use CTS protection for unicast frames sent using extended rates if
671 * there are associated non-ERP stations and RTS/CTS is not configured
672 * for the frame. */
673 if (mode->mode == MODE_IEEE80211G &&
674 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
675 tx->u.tx.unicast && tx->sdata->use_protection &&
676 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
677 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
678
679 /* Setup duration field for the first fragment of the frame. Duration
680 * for remaining fragments will be updated when they are being sent
681 * to low-level driver in ieee80211_tx(). */
682 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
683 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
684 0);
685 hdr->duration_id = cpu_to_le16(dur);
686
687 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
688 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
689 struct ieee80211_rate *rate;
690
691 /* Do not use multiple retry rates when using RTS/CTS */
692 control->alt_retry_rate = -1;
693
694 /* Use min(data rate, max base rate) as CTS/RTS rate */
695 rate = tx->u.tx.rate;
696 while (rate > mode->rates &&
697 !(rate->flags & IEEE80211_RATE_BASIC))
698 rate--;
699
700 control->rts_cts_rate = rate->val;
701 control->rts_rate = rate;
702 }
703
704 if (tx->sta) {
705 tx->sta->tx_packets++;
706 tx->sta->tx_fragments++;
707 tx->sta->tx_bytes += tx->skb->len;
708 if (tx->u.tx.extra_frag) {
709 int i;
710 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
711 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
712 tx->sta->tx_bytes +=
713 tx->u.tx.extra_frag[i]->len;
714 }
715 }
716 }
717
718 return TXRX_CONTINUE;
719}
720
721static ieee80211_txrx_result
722ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
723{
724 struct ieee80211_local *local = tx->local;
725 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
726 struct sk_buff *skb = tx->skb;
727 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
728 u32 load = 0, hdrtime;
729
730 /* TODO: this could be part of tx_status handling, so that the number
731 * of retries would be known; TX rate should in that case be stored
732 * somewhere with the packet */
733
734 /* Estimate total channel use caused by this frame */
735
736 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
737 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
738
739 if (mode->mode == MODE_IEEE80211A ||
740 mode->mode == MODE_ATHEROS_TURBO ||
741 mode->mode == MODE_ATHEROS_TURBOG ||
742 (mode->mode == MODE_IEEE80211G &&
743 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
744 hdrtime = CHAN_UTIL_HDR_SHORT;
745 else
746 hdrtime = CHAN_UTIL_HDR_LONG;
747
748 load = hdrtime;
749 if (!is_multicast_ether_addr(hdr->addr1))
750 load += hdrtime;
751
752 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
753 load += 2 * hdrtime;
754 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
755 load += hdrtime;
756
757 load += skb->len * tx->u.tx.rate->rate_inv;
758
759 if (tx->u.tx.extra_frag) {
760 int i;
761 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
762 load += 2 * hdrtime;
763 load += tx->u.tx.extra_frag[i]->len *
764 tx->u.tx.rate->rate;
765 }
766 }
767
768 /* Divide channel_use by 8 to avoid wrapping around the counter */
769 load >>= CHAN_UTIL_SHIFT;
770 local->channel_use_raw += load;
771 if (tx->sta)
772 tx->sta->channel_use_raw += load;
773 tx->sdata->channel_use_raw += load;
774
775 return TXRX_CONTINUE;
776}
777
778/* TODO: implement register/unregister functions for adding TX/RX handlers
779 * into ordered list */
780
781ieee80211_tx_handler ieee80211_tx_handlers[] =
782{
783 ieee80211_tx_h_check_assoc,
784 ieee80211_tx_h_sequence,
785 ieee80211_tx_h_ps_buf,
786 ieee80211_tx_h_select_key,
787 ieee80211_tx_h_michael_mic_add,
788 ieee80211_tx_h_fragment,
789 ieee80211_tx_h_tkip_encrypt,
790 ieee80211_tx_h_ccmp_encrypt,
791 ieee80211_tx_h_wep_encrypt,
792 ieee80211_tx_h_rate_ctrl,
793 ieee80211_tx_h_misc,
794 ieee80211_tx_h_load_stats,
795 NULL
796};
797
798/* actual transmit path */
799
800/*
801 * deal with packet injection down monitor interface
802 * with Radiotap Header -- only called for monitor mode interface
803 */
804static ieee80211_txrx_result
805__ieee80211_parse_tx_radiotap(
806 struct ieee80211_txrx_data *tx,
807 struct sk_buff *skb, struct ieee80211_tx_control *control)
808{
809 /*
810 * this is the moment to interpret and discard the radiotap header that
811 * must be at the start of the packet injected in Monitor mode
812 *
813 * Need to take some care with endian-ness since radiotap
814 * args are little-endian
815 */
816
817 struct ieee80211_radiotap_iterator iterator;
818 struct ieee80211_radiotap_header *rthdr =
819 (struct ieee80211_radiotap_header *) skb->data;
820 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
821 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
822
823 /*
824 * default control situation for all injected packets
825 * FIXME: this does not suit all usage cases, expand to allow control
826 */
827
828 control->retry_limit = 1; /* no retry */
829 control->key_idx = -1; /* no encryption key */
830 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
831 IEEE80211_TXCTL_USE_CTS_PROTECT);
832 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
833 IEEE80211_TXCTL_NO_ACK;
834 control->antenna_sel_tx = 0; /* default to default antenna */
835
836 /*
837 * for every radiotap entry that is present
838 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
839 * entries present, or -EINVAL on error)
840 */
841
842 while (!ret) {
843 int i, target_rate;
844
845 ret = ieee80211_radiotap_iterator_next(&iterator);
846
847 if (ret)
848 continue;
849
850 /* see if this argument is something we can use */
851 switch (iterator.this_arg_index) {
852 /*
853 * You must take care when dereferencing iterator.this_arg
854 * for multibyte types... the pointer is not aligned. Use
855 * get_unaligned((type *)iterator.this_arg) to dereference
856 * iterator.this_arg for type "type" safely on all arches.
857 */
858 case IEEE80211_RADIOTAP_RATE:
859 /*
860 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
861 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
862 */
863 target_rate = (*iterator.this_arg) * 5;
864 for (i = 0; i < mode->num_rates; i++) {
865 struct ieee80211_rate *r = &mode->rates[i];
866
867 if (r->rate > target_rate)
868 continue;
869
870 control->rate = r;
871
872 if (r->flags & IEEE80211_RATE_PREAMBLE2)
873 control->tx_rate = r->val2;
874 else
875 control->tx_rate = r->val;
876
877 /* end on exact match */
878 if (r->rate == target_rate)
879 i = mode->num_rates;
880 }
881 break;
882
883 case IEEE80211_RADIOTAP_ANTENNA:
884 /*
885 * radiotap uses 0 for 1st ant, mac80211 is 1 for
886 * 1st ant
887 */
888 control->antenna_sel_tx = (*iterator.this_arg) + 1;
889 break;
890
891 case IEEE80211_RADIOTAP_DBM_TX_POWER:
892 control->power_level = *iterator.this_arg;
893 break;
894
895 case IEEE80211_RADIOTAP_FLAGS:
896 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
897 /*
898 * this indicates that the skb we have been
899 * handed has the 32-bit FCS CRC at the end...
900 * we should react to that by snipping it off
901 * because it will be recomputed and added
902 * on transmission
903 */
904 if (skb->len < (iterator.max_length + FCS_LEN))
905 return TXRX_DROP;
906
907 skb_trim(skb, skb->len - FCS_LEN);
908 }
909 break;
910
911 default:
912 break;
913 }
914 }
915
916 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
917 return TXRX_DROP;
918
919 /*
920 * remove the radiotap header
921 * iterator->max_length was sanity-checked against
922 * skb->len by iterator init
923 */
924 skb_pull(skb, iterator.max_length);
925
926 return TXRX_CONTINUE;
927}
928
929static ieee80211_txrx_result inline
930__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
931 struct sk_buff *skb,
932 struct net_device *dev,
933 struct ieee80211_tx_control *control)
934{
935 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
936 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
937 struct ieee80211_sub_if_data *sdata;
938 ieee80211_txrx_result res = TXRX_CONTINUE;
939
940 int hdrlen;
941
942 memset(tx, 0, sizeof(*tx));
943 tx->skb = skb;
944 tx->dev = dev; /* use original interface */
945 tx->local = local;
946 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
947 tx->sta = sta_info_get(local, hdr->addr1);
948 tx->fc = le16_to_cpu(hdr->frame_control);
949
950 /*
951 * set defaults for things that can be set by
952 * injected radiotap headers
953 */
954 control->power_level = local->hw.conf.power_level;
955 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
956 if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
957 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
958
959 /* process and remove the injection radiotap header */
960 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
961 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
962 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
963 TXRX_DROP) {
964 return TXRX_DROP;
965 }
966 /*
967 * we removed the radiotap header after this point,
968 * we filled control with what we could use
969 * set to the actual ieee header now
970 */
971 hdr = (struct ieee80211_hdr *) skb->data;
972 res = TXRX_QUEUED; /* indication it was monitor packet */
973 }
974
975 tx->u.tx.control = control;
976 tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
977 if (is_multicast_ether_addr(hdr->addr1))
978 control->flags |= IEEE80211_TXCTL_NO_ACK;
979 else
980 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
981 tx->fragmented = local->fragmentation_threshold <
982 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
983 skb->len + FCS_LEN > local->fragmentation_threshold &&
984 (!local->ops->set_frag_threshold);
985 if (!tx->sta)
986 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
987 else if (tx->sta->clear_dst_mask) {
988 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
989 tx->sta->clear_dst_mask = 0;
990 }
991 hdrlen = ieee80211_get_hdrlen(tx->fc);
992 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
993 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
994 tx->ethertype = (pos[0] << 8) | pos[1];
995 }
996 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
997
998 return res;
999}
1000
1001/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1002 * finished with it. */
1003static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1004 struct sk_buff *skb,
1005 struct net_device *mdev,
1006 struct ieee80211_tx_control *control)
1007{
1008 struct ieee80211_tx_packet_data *pkt_data;
1009 struct net_device *dev;
1010
1011 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1012 dev = dev_get_by_index(pkt_data->ifindex);
1013 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1014 dev_put(dev);
1015 dev = NULL;
1016 }
1017 if (unlikely(!dev))
1018 return -ENODEV;
1019 __ieee80211_tx_prepare(tx, skb, dev, control);
1020 return 0;
1021}
1022
1023static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1024 struct ieee80211_txrx_data *tx)
1025{
1026 struct ieee80211_tx_control *control = tx->u.tx.control;
1027 int ret, i;
1028
1029 if (!ieee80211_qdisc_installed(local->mdev) &&
1030 __ieee80211_queue_stopped(local, 0)) {
1031 netif_stop_queue(local->mdev);
1032 return IEEE80211_TX_AGAIN;
1033 }
1034 if (skb) {
1035 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1036 ret = local->ops->tx(local_to_hw(local), skb, control);
1037 if (ret)
1038 return IEEE80211_TX_AGAIN;
1039 local->mdev->trans_start = jiffies;
1040 ieee80211_led_tx(local, 1);
1041 }
1042 if (tx->u.tx.extra_frag) {
1043 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1044 IEEE80211_TXCTL_USE_CTS_PROTECT |
1045 IEEE80211_TXCTL_CLEAR_DST_MASK |
1046 IEEE80211_TXCTL_FIRST_FRAGMENT);
1047 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1048 if (!tx->u.tx.extra_frag[i])
1049 continue;
1050 if (__ieee80211_queue_stopped(local, control->queue))
1051 return IEEE80211_TX_FRAG_AGAIN;
1052 if (i == tx->u.tx.num_extra_frag) {
1053 control->tx_rate = tx->u.tx.last_frag_hwrate;
1054 control->rate = tx->u.tx.last_frag_rate;
1055 if (tx->u.tx.probe_last_frag)
1056 control->flags |=
1057 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1058 else
1059 control->flags &=
1060 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1061 }
1062
1063 ieee80211_dump_frame(local->mdev->name,
1064 "TX to low-level driver",
1065 tx->u.tx.extra_frag[i]);
1066 ret = local->ops->tx(local_to_hw(local),
1067 tx->u.tx.extra_frag[i],
1068 control);
1069 if (ret)
1070 return IEEE80211_TX_FRAG_AGAIN;
1071 local->mdev->trans_start = jiffies;
1072 ieee80211_led_tx(local, 1);
1073 tx->u.tx.extra_frag[i] = NULL;
1074 }
1075 kfree(tx->u.tx.extra_frag);
1076 tx->u.tx.extra_frag = NULL;
1077 }
1078 return IEEE80211_TX_OK;
1079}
1080
1081static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1082 struct ieee80211_tx_control *control, int mgmt)
1083{
1084 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1085 struct sta_info *sta;
1086 ieee80211_tx_handler *handler;
1087 struct ieee80211_txrx_data tx;
1088 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1089 int ret, i;
1090
1091 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1092
1093 if (unlikely(skb->len < 10)) {
1094 dev_kfree_skb(skb);
1095 return 0;
1096 }
1097
1098 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1099
1100 if (res_prepare == TXRX_DROP) {
1101 dev_kfree_skb(skb);
1102 return 0;
1103 }
1104
1105 sta = tx.sta;
1106 tx.u.tx.mgmt_interface = mgmt;
1107 tx.u.tx.mode = local->hw.conf.mode;
1108
1109 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1110 res = TXRX_CONTINUE;
1111 } else {
1112 for (handler = local->tx_handlers; *handler != NULL;
1113 handler++) {
1114 res = (*handler)(&tx);
1115 if (res != TXRX_CONTINUE)
1116 break;
1117 }
1118 }
1119
1120 skb = tx.skb; /* handlers are allowed to change skb */
1121
1122 if (sta)
1123 sta_info_put(sta);
1124
1125 if (unlikely(res == TXRX_DROP)) {
1126 I802_DEBUG_INC(local->tx_handlers_drop);
1127 goto drop;
1128 }
1129
1130 if (unlikely(res == TXRX_QUEUED)) {
1131 I802_DEBUG_INC(local->tx_handlers_queued);
1132 return 0;
1133 }
1134
1135 if (tx.u.tx.extra_frag) {
1136 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1137 int next_len, dur;
1138 struct ieee80211_hdr *hdr =
1139 (struct ieee80211_hdr *)
1140 tx.u.tx.extra_frag[i]->data;
1141
1142 if (i + 1 < tx.u.tx.num_extra_frag) {
1143 next_len = tx.u.tx.extra_frag[i + 1]->len;
1144 } else {
1145 next_len = 0;
1146 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1147 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1148 }
1149 dur = ieee80211_duration(&tx, 0, next_len);
1150 hdr->duration_id = cpu_to_le16(dur);
1151 }
1152 }
1153
1154retry:
1155 ret = __ieee80211_tx(local, skb, &tx);
1156 if (ret) {
1157 struct ieee80211_tx_stored_packet *store =
1158 &local->pending_packet[control->queue];
1159
1160 if (ret == IEEE80211_TX_FRAG_AGAIN)
1161 skb = NULL;
1162 set_bit(IEEE80211_LINK_STATE_PENDING,
1163 &local->state[control->queue]);
1164 smp_mb();
1165 /* When the driver gets out of buffers during sending of
1166 * fragments and calls ieee80211_stop_queue, there is
1167 * a small window between IEEE80211_LINK_STATE_XOFF and
1168 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1169 * gets available in that window (i.e. driver calls
1170 * ieee80211_wake_queue), we would end up with ieee80211_tx
1171 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1172 * continuing transmitting here when that situation is
1173 * possible to have happened. */
1174 if (!__ieee80211_queue_stopped(local, control->queue)) {
1175 clear_bit(IEEE80211_LINK_STATE_PENDING,
1176 &local->state[control->queue]);
1177 goto retry;
1178 }
1179 memcpy(&store->control, control,
1180 sizeof(struct ieee80211_tx_control));
1181 store->skb = skb;
1182 store->extra_frag = tx.u.tx.extra_frag;
1183 store->num_extra_frag = tx.u.tx.num_extra_frag;
1184 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1185 store->last_frag_rate = tx.u.tx.last_frag_rate;
1186 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1187 }
1188 return 0;
1189
1190 drop:
1191 if (skb)
1192 dev_kfree_skb(skb);
1193 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1194 if (tx.u.tx.extra_frag[i])
1195 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1196 kfree(tx.u.tx.extra_frag);
1197 return 0;
1198}
1199
1200/* device xmit handlers */
1201
1202int ieee80211_master_start_xmit(struct sk_buff *skb,
1203 struct net_device *dev)
1204{
1205 struct ieee80211_tx_control control;
1206 struct ieee80211_tx_packet_data *pkt_data;
1207 struct net_device *odev = NULL;
1208 struct ieee80211_sub_if_data *osdata;
1209 int headroom;
1210 int ret;
1211
1212 /*
1213 * copy control out of the skb so other people can use skb->cb
1214 */
1215 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1216 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1217
1218 if (pkt_data->ifindex)
1219 odev = dev_get_by_index(pkt_data->ifindex);
1220 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1221 dev_put(odev);
1222 odev = NULL;
1223 }
1224 if (unlikely(!odev)) {
1225#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1226 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1227 "originating device\n", dev->name);
1228#endif
1229 dev_kfree_skb(skb);
1230 return 0;
1231 }
1232 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1233
1234 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1235 if (skb_headroom(skb) < headroom) {
1236 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1237 dev_kfree_skb(skb);
1238 dev_put(odev);
1239 return 0;
1240 }
1241 }
1242
1243 control.ifindex = odev->ifindex;
1244 control.type = osdata->type;
1245 if (pkt_data->req_tx_status)
1246 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1247 if (pkt_data->do_not_encrypt)
1248 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1249 if (pkt_data->requeue)
1250 control.flags |= IEEE80211_TXCTL_REQUEUE;
1251 control.queue = pkt_data->queue;
1252
1253 ret = ieee80211_tx(odev, skb, &control,
1254 control.type == IEEE80211_IF_TYPE_MGMT);
1255 dev_put(odev);
1256
1257 return ret;
1258}
1259
1260int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1261 struct net_device *dev)
1262{
1263 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1264 struct ieee80211_tx_packet_data *pkt_data;
1265 struct ieee80211_radiotap_header *prthdr =
1266 (struct ieee80211_radiotap_header *)skb->data;
1267 u16 len;
1268
1269 /*
1270 * there must be a radiotap header at the
1271 * start in this case
1272 */
1273 if (unlikely(prthdr->it_version)) {
1274 /* only version 0 is supported */
1275 dev_kfree_skb(skb);
1276 return NETDEV_TX_OK;
1277 }
1278
1279 skb->dev = local->mdev;
1280
1281 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1282 memset(pkt_data, 0, sizeof(*pkt_data));
1283 pkt_data->ifindex = dev->ifindex;
1284 pkt_data->mgmt_iface = 0;
1285 pkt_data->do_not_encrypt = 1;
1286
1287 /* above needed because we set skb device to master */
1288
1289 /*
1290 * fix up the pointers accounting for the radiotap
1291 * header still being in there. We are being given
1292 * a precooked IEEE80211 header so no need for
1293 * normal processing
1294 */
1295 len = le16_to_cpu(get_unaligned(&prthdr->it_len));
1296 skb_set_mac_header(skb, len);
1297 skb_set_network_header(skb, len + sizeof(struct ieee80211_hdr));
1298 skb_set_transport_header(skb, len + sizeof(struct ieee80211_hdr));
1299
1300 /*
1301 * pass the radiotap header up to
1302 * the next stage intact
1303 */
1304 dev_queue_xmit(skb);
1305
1306 return NETDEV_TX_OK;
1307}
1308
1309/**
1310 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1311 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1312 * @skb: packet to be sent
1313 * @dev: incoming interface
1314 *
1315 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1316 * not be freed, and caller is responsible for either retrying later or freeing
1317 * skb).
1318 *
1319 * This function takes in an Ethernet header and encapsulates it with suitable
1320 * IEEE 802.11 header based on which interface the packet is coming in. The
1321 * encapsulated packet will then be passed to master interface, wlan#.11, for
1322 * transmission (through low-level driver).
1323 */
1324int ieee80211_subif_start_xmit(struct sk_buff *skb,
1325 struct net_device *dev)
1326{
1327 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1328 struct ieee80211_tx_packet_data *pkt_data;
1329 struct ieee80211_sub_if_data *sdata;
1330 int ret = 1, head_need;
1331 u16 ethertype, hdrlen, fc;
1332 struct ieee80211_hdr hdr;
1333 const u8 *encaps_data;
1334 int encaps_len, skip_header_bytes;
1335 int nh_pos, h_pos, no_encrypt = 0;
1336 struct sta_info *sta;
1337
1338 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1339 if (unlikely(skb->len < ETH_HLEN)) {
1340 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1341 dev->name, skb->len);
1342 ret = 0;
1343 goto fail;
1344 }
1345
1346 nh_pos = skb_network_header(skb) - skb->data;
1347 h_pos = skb_transport_header(skb) - skb->data;
1348
1349 /* convert Ethernet header to proper 802.11 header (based on
1350 * operation mode) */
1351 ethertype = (skb->data[12] << 8) | skb->data[13];
1352 /* TODO: handling for 802.1x authorized/unauthorized port */
1353 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1354
1355 if (likely(sdata->type == IEEE80211_IF_TYPE_AP ||
1356 sdata->type == IEEE80211_IF_TYPE_VLAN)) {
1357 fc |= IEEE80211_FCTL_FROMDS;
1358 /* DA BSSID SA */
1359 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1360 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1361 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1362 hdrlen = 24;
1363 } else if (sdata->type == IEEE80211_IF_TYPE_WDS) {
1364 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1365 /* RA TA DA SA */
1366 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1367 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1368 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1369 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1370 hdrlen = 30;
1371 } else if (sdata->type == IEEE80211_IF_TYPE_STA) {
1372 fc |= IEEE80211_FCTL_TODS;
1373 /* BSSID SA DA */
1374 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1375 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1376 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1377 hdrlen = 24;
1378 } else if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
1379 /* DA SA BSSID */
1380 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1381 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1382 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1383 hdrlen = 24;
1384 } else {
1385 ret = 0;
1386 goto fail;
1387 }
1388
1389 /* receiver is QoS enabled, use a QoS type frame */
1390 sta = sta_info_get(local, hdr.addr1);
1391 if (sta) {
1392 if (sta->flags & WLAN_STA_WME) {
1393 fc |= IEEE80211_STYPE_QOS_DATA;
1394 hdrlen += 2;
1395 }
1396 sta_info_put(sta);
1397 }
1398
1399 hdr.frame_control = cpu_to_le16(fc);
1400 hdr.duration_id = 0;
1401 hdr.seq_ctrl = 0;
1402
1403 skip_header_bytes = ETH_HLEN;
1404 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1405 encaps_data = bridge_tunnel_header;
1406 encaps_len = sizeof(bridge_tunnel_header);
1407 skip_header_bytes -= 2;
1408 } else if (ethertype >= 0x600) {
1409 encaps_data = rfc1042_header;
1410 encaps_len = sizeof(rfc1042_header);
1411 skip_header_bytes -= 2;
1412 } else {
1413 encaps_data = NULL;
1414 encaps_len = 0;
1415 }
1416
1417 skb_pull(skb, skip_header_bytes);
1418 nh_pos -= skip_header_bytes;
1419 h_pos -= skip_header_bytes;
1420
1421 /* TODO: implement support for fragments so that there is no need to
1422 * reallocate and copy payload; it might be enough to support one
1423 * extra fragment that would be copied in the beginning of the frame
1424 * data.. anyway, it would be nice to include this into skb structure
1425 * somehow
1426 *
1427 * There are few options for this:
1428 * use skb->cb as an extra space for 802.11 header
1429 * allocate new buffer if not enough headroom
1430 * make sure that there is enough headroom in every skb by increasing
1431 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1432 * alloc_skb() (net/core/skbuff.c)
1433 */
1434 head_need = hdrlen + encaps_len + local->tx_headroom;
1435 head_need -= skb_headroom(skb);
1436
1437 /* We are going to modify skb data, so make a copy of it if happens to
1438 * be cloned. This could happen, e.g., with Linux bridge code passing
1439 * us broadcast frames. */
1440
1441 if (head_need > 0 || skb_cloned(skb)) {
1442#if 0
1443 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1444 "of headroom\n", dev->name, head_need);
1445#endif
1446
1447 if (skb_cloned(skb))
1448 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1449 else
1450 I802_DEBUG_INC(local->tx_expand_skb_head);
1451 /* Since we have to reallocate the buffer, make sure that there
1452 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1453 * before payload and 12 after). */
1454 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1455 12, GFP_ATOMIC)) {
1456 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1457 "\n", dev->name);
1458 goto fail;
1459 }
1460 }
1461
1462 if (encaps_data) {
1463 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1464 nh_pos += encaps_len;
1465 h_pos += encaps_len;
1466 }
1467 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1468 nh_pos += hdrlen;
1469 h_pos += hdrlen;
1470
1471 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1472 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1473 pkt_data->ifindex = dev->ifindex;
1474 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1475 pkt_data->do_not_encrypt = no_encrypt;
1476
1477 skb->dev = local->mdev;
1478 sdata->stats.tx_packets++;
1479 sdata->stats.tx_bytes += skb->len;
1480
1481 /* Update skb pointers to various headers since this modified frame
1482 * is going to go through Linux networking code that may potentially
1483 * need things like pointer to IP header. */
1484 skb_set_mac_header(skb, 0);
1485 skb_set_network_header(skb, nh_pos);
1486 skb_set_transport_header(skb, h_pos);
1487
1488 dev->trans_start = jiffies;
1489 dev_queue_xmit(skb);
1490
1491 return 0;
1492
1493 fail:
1494 if (!ret)
1495 dev_kfree_skb(skb);
1496
1497 return ret;
1498}
1499
1500/*
1501 * This is the transmit routine for the 802.11 type interfaces
1502 * called by upper layers of the linux networking
1503 * stack when it has a frame to transmit
1504 */
1505int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1506{
1507 struct ieee80211_sub_if_data *sdata;
1508 struct ieee80211_tx_packet_data *pkt_data;
1509 struct ieee80211_hdr *hdr;
1510 u16 fc;
1511
1512 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1513
1514 if (skb->len < 10) {
1515 dev_kfree_skb(skb);
1516 return 0;
1517 }
1518
1519 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1520 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1521 0, GFP_ATOMIC)) {
1522 dev_kfree_skb(skb);
1523 return 0;
1524 }
1525 }
1526
1527 hdr = (struct ieee80211_hdr *) skb->data;
1528 fc = le16_to_cpu(hdr->frame_control);
1529
1530 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1531 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1532 pkt_data->ifindex = sdata->dev->ifindex;
1533 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1534
1535 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1536 skb->dev = sdata->local->mdev;
1537
1538 /*
1539 * We're using the protocol field of the the frame control header
1540 * to request TX callback for hostapd. BIT(1) is checked.
1541 */
1542 if ((fc & BIT(1)) == BIT(1)) {
1543 pkt_data->req_tx_status = 1;
1544 fc &= ~BIT(1);
1545 hdr->frame_control = cpu_to_le16(fc);
1546 }
1547
1548 pkt_data->do_not_encrypt = !(fc & IEEE80211_FCTL_PROTECTED);
1549
1550 sdata->stats.tx_packets++;
1551 sdata->stats.tx_bytes += skb->len;
1552
1553 dev_queue_xmit(skb);
1554
1555 return 0;
1556}
1557
1558/* helper functions for pending packets for when queues are stopped */
1559
1560void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1561{
1562 int i, j;
1563 struct ieee80211_tx_stored_packet *store;
1564
1565 for (i = 0; i < local->hw.queues; i++) {
1566 if (!__ieee80211_queue_pending(local, i))
1567 continue;
1568 store = &local->pending_packet[i];
1569 kfree_skb(store->skb);
1570 for (j = 0; j < store->num_extra_frag; j++)
1571 kfree_skb(store->extra_frag[j]);
1572 kfree(store->extra_frag);
1573 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1574 }
1575}
1576
1577void ieee80211_tx_pending(unsigned long data)
1578{
1579 struct ieee80211_local *local = (struct ieee80211_local *)data;
1580 struct net_device *dev = local->mdev;
1581 struct ieee80211_tx_stored_packet *store;
1582 struct ieee80211_txrx_data tx;
1583 int i, ret, reschedule = 0;
1584
1585 netif_tx_lock_bh(dev);
1586 for (i = 0; i < local->hw.queues; i++) {
1587 if (__ieee80211_queue_stopped(local, i))
1588 continue;
1589 if (!__ieee80211_queue_pending(local, i)) {
1590 reschedule = 1;
1591 continue;
1592 }
1593 store = &local->pending_packet[i];
1594 tx.u.tx.control = &store->control;
1595 tx.u.tx.extra_frag = store->extra_frag;
1596 tx.u.tx.num_extra_frag = store->num_extra_frag;
1597 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1598 tx.u.tx.last_frag_rate = store->last_frag_rate;
1599 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1600 ret = __ieee80211_tx(local, store->skb, &tx);
1601 if (ret) {
1602 if (ret == IEEE80211_TX_FRAG_AGAIN)
1603 store->skb = NULL;
1604 } else {
1605 clear_bit(IEEE80211_LINK_STATE_PENDING,
1606 &local->state[i]);
1607 reschedule = 1;
1608 }
1609 }
1610 netif_tx_unlock_bh(dev);
1611 if (reschedule) {
1612 if (!ieee80211_qdisc_installed(dev)) {
1613 if (!__ieee80211_queue_stopped(local, 0))
1614 netif_wake_queue(dev);
1615 } else
1616 netif_schedule(dev);
1617 }
1618}
1619
1620/* functions for drivers to get certain frames */
1621
1622static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1623 struct ieee80211_if_ap *bss,
1624 struct sk_buff *skb)
1625{
1626 u8 *pos, *tim;
1627 int aid0 = 0;
1628 int i, have_bits = 0, n1, n2;
1629
1630 /* Generate bitmap for TIM only if there are any STAs in power save
1631 * mode. */
1632 spin_lock_bh(&local->sta_lock);
1633 if (atomic_read(&bss->num_sta_ps) > 0)
1634 /* in the hope that this is faster than
1635 * checking byte-for-byte */
1636 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1637 IEEE80211_MAX_AID+1);
1638
1639 if (bss->dtim_count == 0)
1640 bss->dtim_count = bss->dtim_period - 1;
1641 else
1642 bss->dtim_count--;
1643
1644 tim = pos = (u8 *) skb_put(skb, 6);
1645 *pos++ = WLAN_EID_TIM;
1646 *pos++ = 4;
1647 *pos++ = bss->dtim_count;
1648 *pos++ = bss->dtim_period;
1649
1650 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1651 aid0 = 1;
1652
1653 if (have_bits) {
1654 /* Find largest even number N1 so that bits numbered 1 through
1655 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1656 * (N2 + 1) x 8 through 2007 are 0. */
1657 n1 = 0;
1658 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1659 if (bss->tim[i]) {
1660 n1 = i & 0xfe;
1661 break;
1662 }
1663 }
1664 n2 = n1;
1665 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1666 if (bss->tim[i]) {
1667 n2 = i;
1668 break;
1669 }
1670 }
1671
1672 /* Bitmap control */
1673 *pos++ = n1 | aid0;
1674 /* Part Virt Bitmap */
1675 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1676
1677 tim[1] = n2 - n1 + 4;
1678 skb_put(skb, n2 - n1);
1679 } else {
1680 *pos++ = aid0; /* Bitmap control */
1681 *pos++ = 0; /* Part Virt Bitmap */
1682 }
1683 spin_unlock_bh(&local->sta_lock);
1684}
1685
1686struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1687 struct ieee80211_tx_control *control)
1688{
1689 struct ieee80211_local *local = hw_to_local(hw);
1690 struct sk_buff *skb;
1691 struct net_device *bdev;
1692 struct ieee80211_sub_if_data *sdata = NULL;
1693 struct ieee80211_if_ap *ap = NULL;
1694 struct ieee80211_rate *rate;
1695 struct rate_control_extra extra;
1696 u8 *b_head, *b_tail;
1697 int bh_len, bt_len;
1698
1699 bdev = dev_get_by_index(if_id);
1700 if (bdev) {
1701 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1702 ap = &sdata->u.ap;
1703 dev_put(bdev);
1704 }
1705
1706 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1707 !ap->beacon_head) {
1708#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1709 if (net_ratelimit())
1710 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1711 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1712#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1713 return NULL;
1714 }
1715
1716 /* Assume we are generating the normal beacon locally */
1717 b_head = ap->beacon_head;
1718 b_tail = ap->beacon_tail;
1719 bh_len = ap->beacon_head_len;
1720 bt_len = ap->beacon_tail_len;
1721
1722 skb = dev_alloc_skb(local->tx_headroom +
1723 bh_len + bt_len + 256 /* maximum TIM len */);
1724 if (!skb)
1725 return NULL;
1726
1727 skb_reserve(skb, local->tx_headroom);
1728 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1729
1730 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1731
1732 ieee80211_beacon_add_tim(local, ap, skb);
1733
1734 if (b_tail) {
1735 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1736 }
1737
1738 if (control) {
1739 memset(&extra, 0, sizeof(extra));
1740 extra.mode = local->oper_hw_mode;
1741
1742 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1743 if (!rate) {
1744 if (net_ratelimit()) {
1745 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1746 "found\n", local->mdev->name);
1747 }
1748 dev_kfree_skb(skb);
1749 return NULL;
1750 }
1751
1752 control->tx_rate = (local->short_preamble &&
1753 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1754 rate->val2 : rate->val;
1755 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1756 control->power_level = local->hw.conf.power_level;
1757 control->flags |= IEEE80211_TXCTL_NO_ACK;
1758 control->retry_limit = 1;
1759 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1760 }
1761
1762 ap->num_beacons++;
1763 return skb;
1764}
1765EXPORT_SYMBOL(ieee80211_beacon_get);
1766
1767void ieee80211_rts_get(struct ieee80211_hw *hw,
1768 const void *frame, size_t frame_len,
1769 const struct ieee80211_tx_control *frame_txctl,
1770 struct ieee80211_rts *rts)
1771{
1772 const struct ieee80211_hdr *hdr = frame;
1773 u16 fctl;
1774
1775 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1776 rts->frame_control = cpu_to_le16(fctl);
1777 rts->duration = ieee80211_rts_duration(hw, frame_len, frame_txctl);
1778 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1779 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1780}
1781EXPORT_SYMBOL(ieee80211_rts_get);
1782
1783void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
1784 const void *frame, size_t frame_len,
1785 const struct ieee80211_tx_control *frame_txctl,
1786 struct ieee80211_cts *cts)
1787{
1788 const struct ieee80211_hdr *hdr = frame;
1789 u16 fctl;
1790
1791 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1792 cts->frame_control = cpu_to_le16(fctl);
1793 cts->duration = ieee80211_ctstoself_duration(hw, frame_len, frame_txctl);
1794 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1795}
1796EXPORT_SYMBOL(ieee80211_ctstoself_get);
1797
1798struct sk_buff *
1799ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1800 struct ieee80211_tx_control *control)
1801{
1802 struct ieee80211_local *local = hw_to_local(hw);
1803 struct sk_buff *skb;
1804 struct sta_info *sta;
1805 ieee80211_tx_handler *handler;
1806 struct ieee80211_txrx_data tx;
1807 ieee80211_txrx_result res = TXRX_DROP;
1808 struct net_device *bdev;
1809 struct ieee80211_sub_if_data *sdata;
1810 struct ieee80211_if_ap *bss = NULL;
1811
1812 bdev = dev_get_by_index(if_id);
1813 if (bdev) {
1814 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1815 bss = &sdata->u.ap;
1816 dev_put(bdev);
1817 }
1818 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1819 return NULL;
1820
1821 if (bss->dtim_count != 0)
1822 return NULL; /* send buffered bc/mc only after DTIM beacon */
1823 memset(control, 0, sizeof(*control));
1824 while (1) {
1825 skb = skb_dequeue(&bss->ps_bc_buf);
1826 if (!skb)
1827 return NULL;
1828 local->total_ps_buffered--;
1829
1830 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1831 struct ieee80211_hdr *hdr =
1832 (struct ieee80211_hdr *) skb->data;
1833 /* more buffered multicast/broadcast frames ==> set
1834 * MoreData flag in IEEE 802.11 header to inform PS
1835 * STAs */
1836 hdr->frame_control |=
1837 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1838 }
1839
1840 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1841 break;
1842 dev_kfree_skb_any(skb);
1843 }
1844 sta = tx.sta;
1845 tx.u.tx.ps_buffered = 1;
1846
1847 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1848 res = (*handler)(&tx);
1849 if (res == TXRX_DROP || res == TXRX_QUEUED)
1850 break;
1851 }
1852 dev_put(tx.dev);
1853 skb = tx.skb; /* handlers are allowed to change skb */
1854
1855 if (res == TXRX_DROP) {
1856 I802_DEBUG_INC(local->tx_handlers_drop);
1857 dev_kfree_skb(skb);
1858 skb = NULL;
1859 } else if (res == TXRX_QUEUED) {
1860 I802_DEBUG_INC(local->tx_handlers_queued);
1861 skb = NULL;
1862 }
1863
1864 if (sta)
1865 sta_info_put(sta);
1866
1867 return skb;
1868}
1869EXPORT_SYMBOL(ieee80211_get_buffered_bc);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-17 18:08:19 -0500