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[MAC80211]: Remove bitfields from struct ieee80211_tx_packet_data
[deliverable/linux.git] / net / mac80211 / tx.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * 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
38 static 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
49 static 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 */
80 static 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
86 static 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 tx->sdata->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 tx->sdata->short_preamble);
186 }
187
188 return dur;
189 }
190
191 static 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
197 static 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
203 static 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
212 static ieee80211_txrx_result
213 ieee80211_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->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
247 /*
248 * No associated STAs - no need to send multicast
249 * frames.
250 */
251 return TXRX_DROP;
252 }
253 return TXRX_CONTINUE;
254 }
255
256 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
257 !(sta_flags & WLAN_STA_AUTHORIZED))) {
258 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
259 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
260 " (unauthorized port)\n", tx->dev->name,
261 MAC_ARG(hdr->addr1));
262 #endif
263 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
264 return TXRX_DROP;
265 }
266
267 return TXRX_CONTINUE;
268 }
269
270 static ieee80211_txrx_result
271 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
272 {
273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
274
275 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
276 ieee80211_include_sequence(tx->sdata, hdr);
277
278 return TXRX_CONTINUE;
279 }
280
281 /* This function is called whenever the AP is about to exceed the maximum limit
282 * of buffered frames for power saving STAs. This situation should not really
283 * happen often during normal operation, so dropping the oldest buffered packet
284 * from each queue should be OK to make some room for new frames. */
285 static void purge_old_ps_buffers(struct ieee80211_local *local)
286 {
287 int total = 0, purged = 0;
288 struct sk_buff *skb;
289 struct ieee80211_sub_if_data *sdata;
290 struct sta_info *sta;
291
292 read_lock(&local->sub_if_lock);
293 list_for_each_entry(sdata, &local->sub_if_list, list) {
294 struct ieee80211_if_ap *ap;
295 if (sdata->dev == local->mdev ||
296 sdata->type != IEEE80211_IF_TYPE_AP)
297 continue;
298 ap = &sdata->u.ap;
299 skb = skb_dequeue(&ap->ps_bc_buf);
300 if (skb) {
301 purged++;
302 dev_kfree_skb(skb);
303 }
304 total += skb_queue_len(&ap->ps_bc_buf);
305 }
306 read_unlock(&local->sub_if_lock);
307
308 read_lock_bh(&local->sta_lock);
309 list_for_each_entry(sta, &local->sta_list, list) {
310 skb = skb_dequeue(&sta->ps_tx_buf);
311 if (skb) {
312 purged++;
313 dev_kfree_skb(skb);
314 }
315 total += skb_queue_len(&sta->ps_tx_buf);
316 }
317 read_unlock_bh(&local->sta_lock);
318
319 local->total_ps_buffered = total;
320 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
321 local->mdev->name, purged);
322 }
323
324 static inline ieee80211_txrx_result
325 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
326 {
327 /* broadcast/multicast frame */
328 /* If any of the associated stations is in power save mode,
329 * the frame is buffered to be sent after DTIM beacon frame */
330 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
331 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
332 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
333 !(tx->fc & IEEE80211_FCTL_ORDER)) {
334 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
335 purge_old_ps_buffers(tx->local);
336 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
337 AP_MAX_BC_BUFFER) {
338 if (net_ratelimit()) {
339 printk(KERN_DEBUG "%s: BC TX buffer full - "
340 "dropping the oldest frame\n",
341 tx->dev->name);
342 }
343 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
344 } else
345 tx->local->total_ps_buffered++;
346 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
347 return TXRX_QUEUED;
348 }
349
350 return TXRX_CONTINUE;
351 }
352
353 static inline ieee80211_txrx_result
354 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
355 {
356 struct sta_info *sta = tx->sta;
357
358 if (unlikely(!sta ||
359 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
360 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
361 return TXRX_CONTINUE;
362
363 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
364 struct ieee80211_tx_packet_data *pkt_data;
365 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
366 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
367 "before %d)\n",
368 MAC_ARG(sta->addr), sta->aid,
369 skb_queue_len(&sta->ps_tx_buf));
370 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
371 sta->flags |= WLAN_STA_TIM;
372 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
373 purge_old_ps_buffers(tx->local);
374 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
375 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
376 if (net_ratelimit()) {
377 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
378 "buffer full - dropping oldest frame\n",
379 tx->dev->name, MAC_ARG(sta->addr));
380 }
381 dev_kfree_skb(old);
382 } else
383 tx->local->total_ps_buffered++;
384 /* Queue frame to be sent after STA sends an PS Poll frame */
385 if (skb_queue_empty(&sta->ps_tx_buf)) {
386 if (tx->local->ops->set_tim)
387 tx->local->ops->set_tim(local_to_hw(tx->local),
388 sta->aid, 1);
389 if (tx->sdata->bss)
390 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
391 }
392 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
393 pkt_data->jiffies = jiffies;
394 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
395 return TXRX_QUEUED;
396 }
397 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
398 else if (unlikely(sta->flags & WLAN_STA_PS)) {
399 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
400 "set -> send frame\n", tx->dev->name,
401 MAC_ARG(sta->addr));
402 }
403 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
404 sta->pspoll = 0;
405
406 return TXRX_CONTINUE;
407 }
408
409
410 static ieee80211_txrx_result
411 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
412 {
413 if (unlikely(tx->u.tx.ps_buffered))
414 return TXRX_CONTINUE;
415
416 if (tx->u.tx.unicast)
417 return ieee80211_tx_h_unicast_ps_buf(tx);
418 else
419 return ieee80211_tx_h_multicast_ps_buf(tx);
420 }
421
422
423
424
425 static ieee80211_txrx_result
426 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
427 {
428 if (tx->sta)
429 tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
430 else
431 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
432
433 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
434 tx->key = NULL;
435 else if (tx->sta && tx->sta->key)
436 tx->key = tx->sta->key;
437 else if (tx->sdata->default_key)
438 tx->key = tx->sdata->default_key;
439 else if (tx->sdata->drop_unencrypted &&
440 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
441 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
442 return TXRX_DROP;
443 } else
444 tx->key = NULL;
445
446 if (tx->key) {
447 tx->key->tx_rx_count++;
448 if (unlikely(tx->local->key_tx_rx_threshold &&
449 tx->key->tx_rx_count >
450 tx->local->key_tx_rx_threshold)) {
451 ieee80211_key_threshold_notify(tx->dev, tx->key,
452 tx->sta);
453 }
454 }
455
456 return TXRX_CONTINUE;
457 }
458
459 static ieee80211_txrx_result
460 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
461 {
462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
463 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
464 struct sk_buff **frags, *first, *frag;
465 int i;
466 u16 seq;
467 u8 *pos;
468 int frag_threshold = tx->local->fragmentation_threshold;
469
470 if (!tx->fragmented)
471 return TXRX_CONTINUE;
472
473 first = tx->skb;
474
475 hdrlen = ieee80211_get_hdrlen(tx->fc);
476 payload_len = first->len - hdrlen;
477 per_fragm = frag_threshold - hdrlen - FCS_LEN;
478 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
479
480 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
481 if (!frags)
482 goto fail;
483
484 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
485 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
486 pos = first->data + hdrlen + per_fragm;
487 left = payload_len - per_fragm;
488 for (i = 0; i < num_fragm - 1; i++) {
489 struct ieee80211_hdr *fhdr;
490 size_t copylen;
491
492 if (left <= 0)
493 goto fail;
494
495 /* reserve enough extra head and tail room for possible
496 * encryption */
497 frag = frags[i] =
498 dev_alloc_skb(tx->local->tx_headroom +
499 frag_threshold +
500 IEEE80211_ENCRYPT_HEADROOM +
501 IEEE80211_ENCRYPT_TAILROOM);
502 if (!frag)
503 goto fail;
504 /* Make sure that all fragments use the same priority so
505 * that they end up using the same TX queue */
506 frag->priority = first->priority;
507 skb_reserve(frag, tx->local->tx_headroom +
508 IEEE80211_ENCRYPT_HEADROOM);
509 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
510 memcpy(fhdr, first->data, hdrlen);
511 if (i == num_fragm - 2)
512 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
513 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
514 copylen = left > per_fragm ? per_fragm : left;
515 memcpy(skb_put(frag, copylen), pos, copylen);
516
517 pos += copylen;
518 left -= copylen;
519 }
520 skb_trim(first, hdrlen + per_fragm);
521
522 tx->u.tx.num_extra_frag = num_fragm - 1;
523 tx->u.tx.extra_frag = frags;
524
525 return TXRX_CONTINUE;
526
527 fail:
528 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
529 if (frags) {
530 for (i = 0; i < num_fragm - 1; i++)
531 if (frags[i])
532 dev_kfree_skb(frags[i]);
533 kfree(frags);
534 }
535 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
536 return TXRX_DROP;
537 }
538
539 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
540 {
541 if (tx->key->force_sw_encrypt) {
542 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
543 return -1;
544 } else {
545 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
546 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
547 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
548 NULL)
549 return -1;
550 }
551 }
552 return 0;
553 }
554
555 static ieee80211_txrx_result
556 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
557 {
558 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
559 u16 fc;
560
561 fc = le16_to_cpu(hdr->frame_control);
562
563 if (!tx->key || tx->key->alg != ALG_WEP ||
564 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
565 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
566 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
567 return TXRX_CONTINUE;
568
569 tx->u.tx.control->iv_len = WEP_IV_LEN;
570 tx->u.tx.control->icv_len = WEP_ICV_LEN;
571 ieee80211_tx_set_iswep(tx);
572
573 if (wep_encrypt_skb(tx, tx->skb) < 0) {
574 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
575 return TXRX_DROP;
576 }
577
578 if (tx->u.tx.extra_frag) {
579 int i;
580 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
581 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
582 I802_DEBUG_INC(tx->local->
583 tx_handlers_drop_wep);
584 return TXRX_DROP;
585 }
586 }
587 }
588
589 return TXRX_CONTINUE;
590 }
591
592 static ieee80211_txrx_result
593 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
594 {
595 struct rate_control_extra extra;
596
597 memset(&extra, 0, sizeof(extra));
598 extra.mode = tx->u.tx.mode;
599 extra.mgmt_data = tx->sdata &&
600 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
601 extra.ethertype = tx->ethertype;
602
603 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
604 &extra);
605 if (unlikely(extra.probe != NULL)) {
606 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
607 tx->u.tx.probe_last_frag = 1;
608 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
609 tx->u.tx.rate = extra.probe;
610 } else {
611 tx->u.tx.control->alt_retry_rate = -1;
612 }
613 if (!tx->u.tx.rate)
614 return TXRX_DROP;
615 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
616 tx->sdata->use_protection && tx->fragmented &&
617 extra.nonerp) {
618 tx->u.tx.last_frag_rate = tx->u.tx.rate;
619 tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
620
621 tx->u.tx.rate = extra.nonerp;
622 tx->u.tx.control->rate = extra.nonerp;
623 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
624 } else {
625 tx->u.tx.last_frag_rate = tx->u.tx.rate;
626 tx->u.tx.control->rate = tx->u.tx.rate;
627 }
628 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
629
630 return TXRX_CONTINUE;
631 }
632
633 static ieee80211_txrx_result
634 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
635 {
636 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
637 u16 fc = le16_to_cpu(hdr->frame_control);
638 u16 dur;
639 struct ieee80211_tx_control *control = tx->u.tx.control;
640 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
641
642 if (!is_multicast_ether_addr(hdr->addr1)) {
643 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
644 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
645 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
646 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
647 control->retry_limit =
648 tx->local->long_retry_limit;
649 } else {
650 control->retry_limit =
651 tx->local->short_retry_limit;
652 }
653 } else {
654 control->retry_limit = 1;
655 }
656
657 if (tx->fragmented) {
658 /* Do not use multiple retry rates when sending fragmented
659 * frames.
660 * TODO: The last fragment could still use multiple retry
661 * rates. */
662 control->alt_retry_rate = -1;
663 }
664
665 /* Use CTS protection for unicast frames sent using extended rates if
666 * there are associated non-ERP stations and RTS/CTS is not configured
667 * for the frame. */
668 if (mode->mode == MODE_IEEE80211G &&
669 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
670 tx->u.tx.unicast && tx->sdata->use_protection &&
671 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
672 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
673
674 /* Transmit data frames using short preambles if the driver supports
675 * short preambles at the selected rate and short preambles are
676 * available on the network at the current point in time. */
677 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
678 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
679 tx->sdata->short_preamble &&
680 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
681 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
682 }
683
684 /* Setup duration field for the first fragment of the frame. Duration
685 * for remaining fragments will be updated when they are being sent
686 * to low-level driver in ieee80211_tx(). */
687 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
688 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
689 0);
690 hdr->duration_id = cpu_to_le16(dur);
691
692 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
693 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
694 struct ieee80211_rate *rate;
695
696 /* Do not use multiple retry rates when using RTS/CTS */
697 control->alt_retry_rate = -1;
698
699 /* Use min(data rate, max base rate) as CTS/RTS rate */
700 rate = tx->u.tx.rate;
701 while (rate > mode->rates &&
702 !(rate->flags & IEEE80211_RATE_BASIC))
703 rate--;
704
705 control->rts_cts_rate = rate->val;
706 control->rts_rate = rate;
707 }
708
709 if (tx->sta) {
710 tx->sta->tx_packets++;
711 tx->sta->tx_fragments++;
712 tx->sta->tx_bytes += tx->skb->len;
713 if (tx->u.tx.extra_frag) {
714 int i;
715 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
716 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
717 tx->sta->tx_bytes +=
718 tx->u.tx.extra_frag[i]->len;
719 }
720 }
721 }
722
723 return TXRX_CONTINUE;
724 }
725
726 static ieee80211_txrx_result
727 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
728 {
729 struct ieee80211_local *local = tx->local;
730 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
731 struct sk_buff *skb = tx->skb;
732 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
733 u32 load = 0, hdrtime;
734
735 /* TODO: this could be part of tx_status handling, so that the number
736 * of retries would be known; TX rate should in that case be stored
737 * somewhere with the packet */
738
739 /* Estimate total channel use caused by this frame */
740
741 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
742 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
743
744 if (mode->mode == MODE_IEEE80211A ||
745 mode->mode == MODE_ATHEROS_TURBO ||
746 mode->mode == MODE_ATHEROS_TURBOG ||
747 (mode->mode == MODE_IEEE80211G &&
748 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
749 hdrtime = CHAN_UTIL_HDR_SHORT;
750 else
751 hdrtime = CHAN_UTIL_HDR_LONG;
752
753 load = hdrtime;
754 if (!is_multicast_ether_addr(hdr->addr1))
755 load += hdrtime;
756
757 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
758 load += 2 * hdrtime;
759 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
760 load += hdrtime;
761
762 load += skb->len * tx->u.tx.rate->rate_inv;
763
764 if (tx->u.tx.extra_frag) {
765 int i;
766 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
767 load += 2 * hdrtime;
768 load += tx->u.tx.extra_frag[i]->len *
769 tx->u.tx.rate->rate;
770 }
771 }
772
773 /* Divide channel_use by 8 to avoid wrapping around the counter */
774 load >>= CHAN_UTIL_SHIFT;
775 local->channel_use_raw += load;
776 if (tx->sta)
777 tx->sta->channel_use_raw += load;
778 tx->sdata->channel_use_raw += load;
779
780 return TXRX_CONTINUE;
781 }
782
783 /* TODO: implement register/unregister functions for adding TX/RX handlers
784 * into ordered list */
785
786 ieee80211_tx_handler ieee80211_tx_handlers[] =
787 {
788 ieee80211_tx_h_check_assoc,
789 ieee80211_tx_h_sequence,
790 ieee80211_tx_h_ps_buf,
791 ieee80211_tx_h_select_key,
792 ieee80211_tx_h_michael_mic_add,
793 ieee80211_tx_h_fragment,
794 ieee80211_tx_h_tkip_encrypt,
795 ieee80211_tx_h_ccmp_encrypt,
796 ieee80211_tx_h_wep_encrypt,
797 ieee80211_tx_h_rate_ctrl,
798 ieee80211_tx_h_misc,
799 ieee80211_tx_h_load_stats,
800 NULL
801 };
802
803 /* actual transmit path */
804
805 /*
806 * deal with packet injection down monitor interface
807 * with Radiotap Header -- only called for monitor mode interface
808 */
809 static ieee80211_txrx_result
810 __ieee80211_parse_tx_radiotap(
811 struct ieee80211_txrx_data *tx,
812 struct sk_buff *skb, struct ieee80211_tx_control *control)
813 {
814 /*
815 * this is the moment to interpret and discard the radiotap header that
816 * must be at the start of the packet injected in Monitor mode
817 *
818 * Need to take some care with endian-ness since radiotap
819 * args are little-endian
820 */
821
822 struct ieee80211_radiotap_iterator iterator;
823 struct ieee80211_radiotap_header *rthdr =
824 (struct ieee80211_radiotap_header *) skb->data;
825 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
826 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
827
828 /*
829 * default control situation for all injected packets
830 * FIXME: this does not suit all usage cases, expand to allow control
831 */
832
833 control->retry_limit = 1; /* no retry */
834 control->key_idx = -1; /* no encryption key */
835 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
836 IEEE80211_TXCTL_USE_CTS_PROTECT);
837 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
838 IEEE80211_TXCTL_NO_ACK;
839 control->antenna_sel_tx = 0; /* default to default antenna */
840
841 /*
842 * for every radiotap entry that is present
843 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
844 * entries present, or -EINVAL on error)
845 */
846
847 while (!ret) {
848 int i, target_rate;
849
850 ret = ieee80211_radiotap_iterator_next(&iterator);
851
852 if (ret)
853 continue;
854
855 /* see if this argument is something we can use */
856 switch (iterator.this_arg_index) {
857 /*
858 * You must take care when dereferencing iterator.this_arg
859 * for multibyte types... the pointer is not aligned. Use
860 * get_unaligned((type *)iterator.this_arg) to dereference
861 * iterator.this_arg for type "type" safely on all arches.
862 */
863 case IEEE80211_RADIOTAP_RATE:
864 /*
865 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
866 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
867 */
868 target_rate = (*iterator.this_arg) * 5;
869 for (i = 0; i < mode->num_rates; i++) {
870 struct ieee80211_rate *r = &mode->rates[i];
871
872 if (r->rate > target_rate)
873 continue;
874
875 control->rate = r;
876
877 if (r->flags & IEEE80211_RATE_PREAMBLE2)
878 control->tx_rate = r->val2;
879 else
880 control->tx_rate = r->val;
881
882 /* end on exact match */
883 if (r->rate == target_rate)
884 i = mode->num_rates;
885 }
886 break;
887
888 case IEEE80211_RADIOTAP_ANTENNA:
889 /*
890 * radiotap uses 0 for 1st ant, mac80211 is 1 for
891 * 1st ant
892 */
893 control->antenna_sel_tx = (*iterator.this_arg) + 1;
894 break;
895
896 case IEEE80211_RADIOTAP_DBM_TX_POWER:
897 control->power_level = *iterator.this_arg;
898 break;
899
900 case IEEE80211_RADIOTAP_FLAGS:
901 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
902 /*
903 * this indicates that the skb we have been
904 * handed has the 32-bit FCS CRC at the end...
905 * we should react to that by snipping it off
906 * because it will be recomputed and added
907 * on transmission
908 */
909 if (skb->len < (iterator.max_length + FCS_LEN))
910 return TXRX_DROP;
911
912 skb_trim(skb, skb->len - FCS_LEN);
913 }
914 break;
915
916 default:
917 break;
918 }
919 }
920
921 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
922 return TXRX_DROP;
923
924 /*
925 * remove the radiotap header
926 * iterator->max_length was sanity-checked against
927 * skb->len by iterator init
928 */
929 skb_pull(skb, iterator.max_length);
930
931 return TXRX_CONTINUE;
932 }
933
934 static ieee80211_txrx_result inline
935 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
936 struct sk_buff *skb,
937 struct net_device *dev,
938 struct ieee80211_tx_control *control)
939 {
940 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
941 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
942 struct ieee80211_sub_if_data *sdata;
943 ieee80211_txrx_result res = TXRX_CONTINUE;
944
945 int hdrlen;
946
947 memset(tx, 0, sizeof(*tx));
948 tx->skb = skb;
949 tx->dev = dev; /* use original interface */
950 tx->local = local;
951 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
952 tx->sta = sta_info_get(local, hdr->addr1);
953 tx->fc = le16_to_cpu(hdr->frame_control);
954
955 /*
956 * set defaults for things that can be set by
957 * injected radiotap headers
958 */
959 control->power_level = local->hw.conf.power_level;
960 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
961
962 /* process and remove the injection radiotap header */
963 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
964 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
965 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
966 TXRX_DROP) {
967 return TXRX_DROP;
968 }
969 /*
970 * we removed the radiotap header after this point,
971 * we filled control with what we could use
972 * set to the actual ieee header now
973 */
974 hdr = (struct ieee80211_hdr *) skb->data;
975 res = TXRX_QUEUED; /* indication it was monitor packet */
976 }
977
978 tx->u.tx.control = control;
979 tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
980 if (is_multicast_ether_addr(hdr->addr1))
981 control->flags |= IEEE80211_TXCTL_NO_ACK;
982 else
983 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
984 tx->fragmented = local->fragmentation_threshold <
985 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
986 skb->len + FCS_LEN > local->fragmentation_threshold &&
987 (!local->ops->set_frag_threshold);
988 if (!tx->sta)
989 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
990 else if (tx->sta->clear_dst_mask) {
991 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
992 tx->sta->clear_dst_mask = 0;
993 }
994 hdrlen = ieee80211_get_hdrlen(tx->fc);
995 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
996 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
997 tx->ethertype = (pos[0] << 8) | pos[1];
998 }
999 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1000
1001 return res;
1002 }
1003
1004 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1005 * finished with it. */
1006 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1007 struct sk_buff *skb,
1008 struct net_device *mdev,
1009 struct ieee80211_tx_control *control)
1010 {
1011 struct ieee80211_tx_packet_data *pkt_data;
1012 struct net_device *dev;
1013
1014 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1015 dev = dev_get_by_index(pkt_data->ifindex);
1016 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1017 dev_put(dev);
1018 dev = NULL;
1019 }
1020 if (unlikely(!dev))
1021 return -ENODEV;
1022 __ieee80211_tx_prepare(tx, skb, dev, control);
1023 return 0;
1024 }
1025
1026 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1027 struct ieee80211_txrx_data *tx)
1028 {
1029 struct ieee80211_tx_control *control = tx->u.tx.control;
1030 int ret, i;
1031
1032 if (!ieee80211_qdisc_installed(local->mdev) &&
1033 __ieee80211_queue_stopped(local, 0)) {
1034 netif_stop_queue(local->mdev);
1035 return IEEE80211_TX_AGAIN;
1036 }
1037 if (skb) {
1038 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1039 ret = local->ops->tx(local_to_hw(local), skb, control);
1040 if (ret)
1041 return IEEE80211_TX_AGAIN;
1042 local->mdev->trans_start = jiffies;
1043 ieee80211_led_tx(local, 1);
1044 }
1045 if (tx->u.tx.extra_frag) {
1046 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1047 IEEE80211_TXCTL_USE_CTS_PROTECT |
1048 IEEE80211_TXCTL_CLEAR_DST_MASK |
1049 IEEE80211_TXCTL_FIRST_FRAGMENT);
1050 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1051 if (!tx->u.tx.extra_frag[i])
1052 continue;
1053 if (__ieee80211_queue_stopped(local, control->queue))
1054 return IEEE80211_TX_FRAG_AGAIN;
1055 if (i == tx->u.tx.num_extra_frag) {
1056 control->tx_rate = tx->u.tx.last_frag_hwrate;
1057 control->rate = tx->u.tx.last_frag_rate;
1058 if (tx->u.tx.probe_last_frag)
1059 control->flags |=
1060 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1061 else
1062 control->flags &=
1063 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1064 }
1065
1066 ieee80211_dump_frame(local->mdev->name,
1067 "TX to low-level driver",
1068 tx->u.tx.extra_frag[i]);
1069 ret = local->ops->tx(local_to_hw(local),
1070 tx->u.tx.extra_frag[i],
1071 control);
1072 if (ret)
1073 return IEEE80211_TX_FRAG_AGAIN;
1074 local->mdev->trans_start = jiffies;
1075 ieee80211_led_tx(local, 1);
1076 tx->u.tx.extra_frag[i] = NULL;
1077 }
1078 kfree(tx->u.tx.extra_frag);
1079 tx->u.tx.extra_frag = NULL;
1080 }
1081 return IEEE80211_TX_OK;
1082 }
1083
1084 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1085 struct ieee80211_tx_control *control, int mgmt)
1086 {
1087 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1088 struct sta_info *sta;
1089 ieee80211_tx_handler *handler;
1090 struct ieee80211_txrx_data tx;
1091 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1092 int ret, i;
1093
1094 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1095
1096 if (unlikely(skb->len < 10)) {
1097 dev_kfree_skb(skb);
1098 return 0;
1099 }
1100
1101 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1102
1103 if (res_prepare == TXRX_DROP) {
1104 dev_kfree_skb(skb);
1105 return 0;
1106 }
1107
1108 sta = tx.sta;
1109 tx.u.tx.mgmt_interface = mgmt;
1110 tx.u.tx.mode = local->hw.conf.mode;
1111
1112 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1113 res = TXRX_CONTINUE;
1114 } else {
1115 for (handler = local->tx_handlers; *handler != NULL;
1116 handler++) {
1117 res = (*handler)(&tx);
1118 if (res != TXRX_CONTINUE)
1119 break;
1120 }
1121 }
1122
1123 skb = tx.skb; /* handlers are allowed to change skb */
1124
1125 if (sta)
1126 sta_info_put(sta);
1127
1128 if (unlikely(res == TXRX_DROP)) {
1129 I802_DEBUG_INC(local->tx_handlers_drop);
1130 goto drop;
1131 }
1132
1133 if (unlikely(res == TXRX_QUEUED)) {
1134 I802_DEBUG_INC(local->tx_handlers_queued);
1135 return 0;
1136 }
1137
1138 if (tx.u.tx.extra_frag) {
1139 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1140 int next_len, dur;
1141 struct ieee80211_hdr *hdr =
1142 (struct ieee80211_hdr *)
1143 tx.u.tx.extra_frag[i]->data;
1144
1145 if (i + 1 < tx.u.tx.num_extra_frag) {
1146 next_len = tx.u.tx.extra_frag[i + 1]->len;
1147 } else {
1148 next_len = 0;
1149 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1150 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1151 }
1152 dur = ieee80211_duration(&tx, 0, next_len);
1153 hdr->duration_id = cpu_to_le16(dur);
1154 }
1155 }
1156
1157 retry:
1158 ret = __ieee80211_tx(local, skb, &tx);
1159 if (ret) {
1160 struct ieee80211_tx_stored_packet *store =
1161 &local->pending_packet[control->queue];
1162
1163 if (ret == IEEE80211_TX_FRAG_AGAIN)
1164 skb = NULL;
1165 set_bit(IEEE80211_LINK_STATE_PENDING,
1166 &local->state[control->queue]);
1167 smp_mb();
1168 /* When the driver gets out of buffers during sending of
1169 * fragments and calls ieee80211_stop_queue, there is
1170 * a small window between IEEE80211_LINK_STATE_XOFF and
1171 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1172 * gets available in that window (i.e. driver calls
1173 * ieee80211_wake_queue), we would end up with ieee80211_tx
1174 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1175 * continuing transmitting here when that situation is
1176 * possible to have happened. */
1177 if (!__ieee80211_queue_stopped(local, control->queue)) {
1178 clear_bit(IEEE80211_LINK_STATE_PENDING,
1179 &local->state[control->queue]);
1180 goto retry;
1181 }
1182 memcpy(&store->control, control,
1183 sizeof(struct ieee80211_tx_control));
1184 store->skb = skb;
1185 store->extra_frag = tx.u.tx.extra_frag;
1186 store->num_extra_frag = tx.u.tx.num_extra_frag;
1187 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1188 store->last_frag_rate = tx.u.tx.last_frag_rate;
1189 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1190 }
1191 return 0;
1192
1193 drop:
1194 if (skb)
1195 dev_kfree_skb(skb);
1196 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1197 if (tx.u.tx.extra_frag[i])
1198 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1199 kfree(tx.u.tx.extra_frag);
1200 return 0;
1201 }
1202
1203 /* device xmit handlers */
1204
1205 int ieee80211_master_start_xmit(struct sk_buff *skb,
1206 struct net_device *dev)
1207 {
1208 struct ieee80211_tx_control control;
1209 struct ieee80211_tx_packet_data *pkt_data;
1210 struct net_device *odev = NULL;
1211 struct ieee80211_sub_if_data *osdata;
1212 int headroom;
1213 int ret;
1214
1215 /*
1216 * copy control out of the skb so other people can use skb->cb
1217 */
1218 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1219 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1220
1221 if (pkt_data->ifindex)
1222 odev = dev_get_by_index(pkt_data->ifindex);
1223 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1224 dev_put(odev);
1225 odev = NULL;
1226 }
1227 if (unlikely(!odev)) {
1228 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1229 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1230 "originating device\n", dev->name);
1231 #endif
1232 dev_kfree_skb(skb);
1233 return 0;
1234 }
1235 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1236
1237 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1238 if (skb_headroom(skb) < headroom) {
1239 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1240 dev_kfree_skb(skb);
1241 dev_put(odev);
1242 return 0;
1243 }
1244 }
1245
1246 control.ifindex = odev->ifindex;
1247 control.type = osdata->type;
1248 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1249 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1250 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1251 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1252 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1253 control.flags |= IEEE80211_TXCTL_REQUEUE;
1254 control.queue = pkt_data->queue;
1255
1256 ret = ieee80211_tx(odev, skb, &control,
1257 control.type == IEEE80211_IF_TYPE_MGMT);
1258 dev_put(odev);
1259
1260 return ret;
1261 }
1262
1263 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1264 struct net_device *dev)
1265 {
1266 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1267 struct ieee80211_tx_packet_data *pkt_data;
1268 struct ieee80211_radiotap_header *prthdr =
1269 (struct ieee80211_radiotap_header *)skb->data;
1270 u16 len_rthdr;
1271
1272 /* check for not even having the fixed radiotap header part */
1273 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1274 goto fail; /* too short to be possibly valid */
1275
1276 /* is it a header version we can trust to find length from? */
1277 if (unlikely(prthdr->it_version))
1278 goto fail; /* only version 0 is supported */
1279
1280 /* then there must be a radiotap header with a length we can use */
1281 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1282
1283 /* does the skb contain enough to deliver on the alleged length? */
1284 if (unlikely(skb->len < len_rthdr))
1285 goto fail; /* skb too short for claimed rt header extent */
1286
1287 skb->dev = local->mdev;
1288
1289 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1290 memset(pkt_data, 0, sizeof(*pkt_data));
1291 /* needed because we set skb device to master */
1292 pkt_data->ifindex = dev->ifindex;
1293
1294 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1295
1296 /*
1297 * fix up the pointers accounting for the radiotap
1298 * header still being in there. We are being given
1299 * a precooked IEEE80211 header so no need for
1300 * normal processing
1301 */
1302 skb_set_mac_header(skb, len_rthdr);
1303 /*
1304 * these are just fixed to the end of the rt area since we
1305 * don't have any better information and at this point, nobody cares
1306 */
1307 skb_set_network_header(skb, len_rthdr);
1308 skb_set_transport_header(skb, len_rthdr);
1309
1310 /* pass the radiotap header up to the next stage intact */
1311 dev_queue_xmit(skb);
1312 return NETDEV_TX_OK;
1313
1314 fail:
1315 dev_kfree_skb(skb);
1316 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1317 }
1318
1319 /**
1320 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1321 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1322 * @skb: packet to be sent
1323 * @dev: incoming interface
1324 *
1325 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1326 * not be freed, and caller is responsible for either retrying later or freeing
1327 * skb).
1328 *
1329 * This function takes in an Ethernet header and encapsulates it with suitable
1330 * IEEE 802.11 header based on which interface the packet is coming in. The
1331 * encapsulated packet will then be passed to master interface, wlan#.11, for
1332 * transmission (through low-level driver).
1333 */
1334 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1335 struct net_device *dev)
1336 {
1337 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1338 struct ieee80211_tx_packet_data *pkt_data;
1339 struct ieee80211_sub_if_data *sdata;
1340 int ret = 1, head_need;
1341 u16 ethertype, hdrlen, fc;
1342 struct ieee80211_hdr hdr;
1343 const u8 *encaps_data;
1344 int encaps_len, skip_header_bytes;
1345 int nh_pos, h_pos;
1346 struct sta_info *sta;
1347
1348 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1349 if (unlikely(skb->len < ETH_HLEN)) {
1350 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1351 dev->name, skb->len);
1352 ret = 0;
1353 goto fail;
1354 }
1355
1356 nh_pos = skb_network_header(skb) - skb->data;
1357 h_pos = skb_transport_header(skb) - skb->data;
1358
1359 /* convert Ethernet header to proper 802.11 header (based on
1360 * operation mode) */
1361 ethertype = (skb->data[12] << 8) | skb->data[13];
1362 /* TODO: handling for 802.1x authorized/unauthorized port */
1363 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1364
1365 switch (sdata->type) {
1366 case IEEE80211_IF_TYPE_AP:
1367 case IEEE80211_IF_TYPE_VLAN:
1368 fc |= IEEE80211_FCTL_FROMDS;
1369 /* DA BSSID SA */
1370 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1371 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1372 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1373 hdrlen = 24;
1374 break;
1375 case IEEE80211_IF_TYPE_WDS:
1376 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1377 /* RA TA DA SA */
1378 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1379 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1380 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1381 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1382 hdrlen = 30;
1383 break;
1384 case IEEE80211_IF_TYPE_STA:
1385 fc |= IEEE80211_FCTL_TODS;
1386 /* BSSID SA DA */
1387 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1388 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1389 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1390 hdrlen = 24;
1391 break;
1392 case IEEE80211_IF_TYPE_IBSS:
1393 /* DA SA BSSID */
1394 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1395 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1396 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1397 hdrlen = 24;
1398 break;
1399 default:
1400 ret = 0;
1401 goto fail;
1402 }
1403
1404 /* receiver is QoS enabled, use a QoS type frame */
1405 sta = sta_info_get(local, hdr.addr1);
1406 if (sta) {
1407 if (sta->flags & WLAN_STA_WME) {
1408 fc |= IEEE80211_STYPE_QOS_DATA;
1409 hdrlen += 2;
1410 }
1411 sta_info_put(sta);
1412 }
1413
1414 hdr.frame_control = cpu_to_le16(fc);
1415 hdr.duration_id = 0;
1416 hdr.seq_ctrl = 0;
1417
1418 skip_header_bytes = ETH_HLEN;
1419 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1420 encaps_data = bridge_tunnel_header;
1421 encaps_len = sizeof(bridge_tunnel_header);
1422 skip_header_bytes -= 2;
1423 } else if (ethertype >= 0x600) {
1424 encaps_data = rfc1042_header;
1425 encaps_len = sizeof(rfc1042_header);
1426 skip_header_bytes -= 2;
1427 } else {
1428 encaps_data = NULL;
1429 encaps_len = 0;
1430 }
1431
1432 skb_pull(skb, skip_header_bytes);
1433 nh_pos -= skip_header_bytes;
1434 h_pos -= skip_header_bytes;
1435
1436 /* TODO: implement support for fragments so that there is no need to
1437 * reallocate and copy payload; it might be enough to support one
1438 * extra fragment that would be copied in the beginning of the frame
1439 * data.. anyway, it would be nice to include this into skb structure
1440 * somehow
1441 *
1442 * There are few options for this:
1443 * use skb->cb as an extra space for 802.11 header
1444 * allocate new buffer if not enough headroom
1445 * make sure that there is enough headroom in every skb by increasing
1446 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1447 * alloc_skb() (net/core/skbuff.c)
1448 */
1449 head_need = hdrlen + encaps_len + local->tx_headroom;
1450 head_need -= skb_headroom(skb);
1451
1452 /* We are going to modify skb data, so make a copy of it if happens to
1453 * be cloned. This could happen, e.g., with Linux bridge code passing
1454 * us broadcast frames. */
1455
1456 if (head_need > 0 || skb_cloned(skb)) {
1457 #if 0
1458 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1459 "of headroom\n", dev->name, head_need);
1460 #endif
1461
1462 if (skb_cloned(skb))
1463 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1464 else
1465 I802_DEBUG_INC(local->tx_expand_skb_head);
1466 /* Since we have to reallocate the buffer, make sure that there
1467 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1468 * before payload and 12 after). */
1469 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1470 12, GFP_ATOMIC)) {
1471 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1472 "\n", dev->name);
1473 goto fail;
1474 }
1475 }
1476
1477 if (encaps_data) {
1478 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1479 nh_pos += encaps_len;
1480 h_pos += encaps_len;
1481 }
1482 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1483 nh_pos += hdrlen;
1484 h_pos += hdrlen;
1485
1486 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1487 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1488 pkt_data->ifindex = dev->ifindex;
1489 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1490 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1491
1492 skb->dev = local->mdev;
1493 sdata->stats.tx_packets++;
1494 sdata->stats.tx_bytes += skb->len;
1495
1496 /* Update skb pointers to various headers since this modified frame
1497 * is going to go through Linux networking code that may potentially
1498 * need things like pointer to IP header. */
1499 skb_set_mac_header(skb, 0);
1500 skb_set_network_header(skb, nh_pos);
1501 skb_set_transport_header(skb, h_pos);
1502
1503 dev->trans_start = jiffies;
1504 dev_queue_xmit(skb);
1505
1506 return 0;
1507
1508 fail:
1509 if (!ret)
1510 dev_kfree_skb(skb);
1511
1512 return ret;
1513 }
1514
1515 /*
1516 * This is the transmit routine for the 802.11 type interfaces
1517 * called by upper layers of the linux networking
1518 * stack when it has a frame to transmit
1519 */
1520 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1521 {
1522 struct ieee80211_sub_if_data *sdata;
1523 struct ieee80211_tx_packet_data *pkt_data;
1524 struct ieee80211_hdr *hdr;
1525 u16 fc;
1526
1527 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1528
1529 if (skb->len < 10) {
1530 dev_kfree_skb(skb);
1531 return 0;
1532 }
1533
1534 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1535 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1536 0, GFP_ATOMIC)) {
1537 dev_kfree_skb(skb);
1538 return 0;
1539 }
1540 }
1541
1542 hdr = (struct ieee80211_hdr *) skb->data;
1543 fc = le16_to_cpu(hdr->frame_control);
1544
1545 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1546 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1547 pkt_data->ifindex = sdata->dev->ifindex;
1548 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1549 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1550
1551 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1552 skb->dev = sdata->local->mdev;
1553
1554 /*
1555 * We're using the protocol field of the the frame control header
1556 * to request TX callback for hostapd. BIT(1) is checked.
1557 */
1558 if ((fc & BIT(1)) == BIT(1)) {
1559 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1560 fc &= ~BIT(1);
1561 hdr->frame_control = cpu_to_le16(fc);
1562 }
1563
1564 if (!(fc & IEEE80211_FCTL_PROTECTED))
1565 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1566
1567 sdata->stats.tx_packets++;
1568 sdata->stats.tx_bytes += skb->len;
1569
1570 dev_queue_xmit(skb);
1571
1572 return 0;
1573 }
1574
1575 /* helper functions for pending packets for when queues are stopped */
1576
1577 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1578 {
1579 int i, j;
1580 struct ieee80211_tx_stored_packet *store;
1581
1582 for (i = 0; i < local->hw.queues; i++) {
1583 if (!__ieee80211_queue_pending(local, i))
1584 continue;
1585 store = &local->pending_packet[i];
1586 kfree_skb(store->skb);
1587 for (j = 0; j < store->num_extra_frag; j++)
1588 kfree_skb(store->extra_frag[j]);
1589 kfree(store->extra_frag);
1590 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1591 }
1592 }
1593
1594 void ieee80211_tx_pending(unsigned long data)
1595 {
1596 struct ieee80211_local *local = (struct ieee80211_local *)data;
1597 struct net_device *dev = local->mdev;
1598 struct ieee80211_tx_stored_packet *store;
1599 struct ieee80211_txrx_data tx;
1600 int i, ret, reschedule = 0;
1601
1602 netif_tx_lock_bh(dev);
1603 for (i = 0; i < local->hw.queues; i++) {
1604 if (__ieee80211_queue_stopped(local, i))
1605 continue;
1606 if (!__ieee80211_queue_pending(local, i)) {
1607 reschedule = 1;
1608 continue;
1609 }
1610 store = &local->pending_packet[i];
1611 tx.u.tx.control = &store->control;
1612 tx.u.tx.extra_frag = store->extra_frag;
1613 tx.u.tx.num_extra_frag = store->num_extra_frag;
1614 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1615 tx.u.tx.last_frag_rate = store->last_frag_rate;
1616 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1617 ret = __ieee80211_tx(local, store->skb, &tx);
1618 if (ret) {
1619 if (ret == IEEE80211_TX_FRAG_AGAIN)
1620 store->skb = NULL;
1621 } else {
1622 clear_bit(IEEE80211_LINK_STATE_PENDING,
1623 &local->state[i]);
1624 reschedule = 1;
1625 }
1626 }
1627 netif_tx_unlock_bh(dev);
1628 if (reschedule) {
1629 if (!ieee80211_qdisc_installed(dev)) {
1630 if (!__ieee80211_queue_stopped(local, 0))
1631 netif_wake_queue(dev);
1632 } else
1633 netif_schedule(dev);
1634 }
1635 }
1636
1637 /* functions for drivers to get certain frames */
1638
1639 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1640 struct ieee80211_if_ap *bss,
1641 struct sk_buff *skb)
1642 {
1643 u8 *pos, *tim;
1644 int aid0 = 0;
1645 int i, have_bits = 0, n1, n2;
1646
1647 /* Generate bitmap for TIM only if there are any STAs in power save
1648 * mode. */
1649 read_lock_bh(&local->sta_lock);
1650 if (atomic_read(&bss->num_sta_ps) > 0)
1651 /* in the hope that this is faster than
1652 * checking byte-for-byte */
1653 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1654 IEEE80211_MAX_AID+1);
1655
1656 if (bss->dtim_count == 0)
1657 bss->dtim_count = bss->dtim_period - 1;
1658 else
1659 bss->dtim_count--;
1660
1661 tim = pos = (u8 *) skb_put(skb, 6);
1662 *pos++ = WLAN_EID_TIM;
1663 *pos++ = 4;
1664 *pos++ = bss->dtim_count;
1665 *pos++ = bss->dtim_period;
1666
1667 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1668 aid0 = 1;
1669
1670 if (have_bits) {
1671 /* Find largest even number N1 so that bits numbered 1 through
1672 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1673 * (N2 + 1) x 8 through 2007 are 0. */
1674 n1 = 0;
1675 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1676 if (bss->tim[i]) {
1677 n1 = i & 0xfe;
1678 break;
1679 }
1680 }
1681 n2 = n1;
1682 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1683 if (bss->tim[i]) {
1684 n2 = i;
1685 break;
1686 }
1687 }
1688
1689 /* Bitmap control */
1690 *pos++ = n1 | aid0;
1691 /* Part Virt Bitmap */
1692 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1693
1694 tim[1] = n2 - n1 + 4;
1695 skb_put(skb, n2 - n1);
1696 } else {
1697 *pos++ = aid0; /* Bitmap control */
1698 *pos++ = 0; /* Part Virt Bitmap */
1699 }
1700 read_unlock_bh(&local->sta_lock);
1701 }
1702
1703 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1704 struct ieee80211_tx_control *control)
1705 {
1706 struct ieee80211_local *local = hw_to_local(hw);
1707 struct sk_buff *skb;
1708 struct net_device *bdev;
1709 struct ieee80211_sub_if_data *sdata = NULL;
1710 struct ieee80211_if_ap *ap = NULL;
1711 struct ieee80211_rate *rate;
1712 struct rate_control_extra extra;
1713 u8 *b_head, *b_tail;
1714 int bh_len, bt_len;
1715
1716 bdev = dev_get_by_index(if_id);
1717 if (bdev) {
1718 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1719 ap = &sdata->u.ap;
1720 dev_put(bdev);
1721 }
1722
1723 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1724 !ap->beacon_head) {
1725 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1726 if (net_ratelimit())
1727 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1728 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1729 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1730 return NULL;
1731 }
1732
1733 /* Assume we are generating the normal beacon locally */
1734 b_head = ap->beacon_head;
1735 b_tail = ap->beacon_tail;
1736 bh_len = ap->beacon_head_len;
1737 bt_len = ap->beacon_tail_len;
1738
1739 skb = dev_alloc_skb(local->tx_headroom +
1740 bh_len + bt_len + 256 /* maximum TIM len */);
1741 if (!skb)
1742 return NULL;
1743
1744 skb_reserve(skb, local->tx_headroom);
1745 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1746
1747 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1748
1749 ieee80211_beacon_add_tim(local, ap, skb);
1750
1751 if (b_tail) {
1752 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1753 }
1754
1755 if (control) {
1756 memset(&extra, 0, sizeof(extra));
1757 extra.mode = local->oper_hw_mode;
1758
1759 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1760 if (!rate) {
1761 if (net_ratelimit()) {
1762 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1763 "found\n", local->mdev->name);
1764 }
1765 dev_kfree_skb(skb);
1766 return NULL;
1767 }
1768
1769 control->tx_rate = (sdata->short_preamble &&
1770 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1771 rate->val2 : rate->val;
1772 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1773 control->power_level = local->hw.conf.power_level;
1774 control->flags |= IEEE80211_TXCTL_NO_ACK;
1775 control->retry_limit = 1;
1776 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1777 }
1778
1779 ap->num_beacons++;
1780 return skb;
1781 }
1782 EXPORT_SYMBOL(ieee80211_beacon_get);
1783
1784 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1785 const void *frame, size_t frame_len,
1786 const struct ieee80211_tx_control *frame_txctl,
1787 struct ieee80211_rts *rts)
1788 {
1789 const struct ieee80211_hdr *hdr = frame;
1790 u16 fctl;
1791
1792 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1793 rts->frame_control = cpu_to_le16(fctl);
1794 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1795 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1796 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1797 }
1798 EXPORT_SYMBOL(ieee80211_rts_get);
1799
1800 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1801 const void *frame, size_t frame_len,
1802 const struct ieee80211_tx_control *frame_txctl,
1803 struct ieee80211_cts *cts)
1804 {
1805 const struct ieee80211_hdr *hdr = frame;
1806 u16 fctl;
1807
1808 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1809 cts->frame_control = cpu_to_le16(fctl);
1810 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1811 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1812 }
1813 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1814
1815 struct sk_buff *
1816 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1817 struct ieee80211_tx_control *control)
1818 {
1819 struct ieee80211_local *local = hw_to_local(hw);
1820 struct sk_buff *skb;
1821 struct sta_info *sta;
1822 ieee80211_tx_handler *handler;
1823 struct ieee80211_txrx_data tx;
1824 ieee80211_txrx_result res = TXRX_DROP;
1825 struct net_device *bdev;
1826 struct ieee80211_sub_if_data *sdata;
1827 struct ieee80211_if_ap *bss = NULL;
1828
1829 bdev = dev_get_by_index(if_id);
1830 if (bdev) {
1831 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1832 bss = &sdata->u.ap;
1833 dev_put(bdev);
1834 }
1835 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1836 return NULL;
1837
1838 if (bss->dtim_count != 0)
1839 return NULL; /* send buffered bc/mc only after DTIM beacon */
1840 memset(control, 0, sizeof(*control));
1841 while (1) {
1842 skb = skb_dequeue(&bss->ps_bc_buf);
1843 if (!skb)
1844 return NULL;
1845 local->total_ps_buffered--;
1846
1847 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1848 struct ieee80211_hdr *hdr =
1849 (struct ieee80211_hdr *) skb->data;
1850 /* more buffered multicast/broadcast frames ==> set
1851 * MoreData flag in IEEE 802.11 header to inform PS
1852 * STAs */
1853 hdr->frame_control |=
1854 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1855 }
1856
1857 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1858 break;
1859 dev_kfree_skb_any(skb);
1860 }
1861 sta = tx.sta;
1862 tx.u.tx.ps_buffered = 1;
1863
1864 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1865 res = (*handler)(&tx);
1866 if (res == TXRX_DROP || res == TXRX_QUEUED)
1867 break;
1868 }
1869 dev_put(tx.dev);
1870 skb = tx.skb; /* handlers are allowed to change skb */
1871
1872 if (res == TXRX_DROP) {
1873 I802_DEBUG_INC(local->tx_handlers_drop);
1874 dev_kfree_skb(skb);
1875 skb = NULL;
1876 } else if (res == TXRX_QUEUED) {
1877 I802_DEBUG_INC(local->tx_handlers_queued);
1878 skb = NULL;
1879 }
1880
1881 if (sta)
1882 sta_info_put(sta);
1883
1884 return skb;
1885 }
1886 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux kernel - Deliverables
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