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modules: fix module waiting for dependent modules' init
[wrt350n-kernel.git] / net / mac80211 / tx.c
blob67b509edd431024ea62623d023f5cf309005af64
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "ieee80211_led.h"
29 #include "wep.h"
30 #include "wpa.h"
31 #include "wme.h"
32 #include "ieee80211_rate.h"
33
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
37
38 /* misc utils */
39
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_hdr *hdr)
42 {
43 /* Set the sequence number for this frame. */
44 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
45
46 /* Increase the sequence number. */
47 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
48 }
49
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname, const char *title,
52 const struct sk_buff *skb)
53 {
54 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
55 u16 fc;
56 int hdrlen;
57 DECLARE_MAC_BUF(mac);
58
59 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
60 if (skb->len < 4) {
61 printk("\n");
62 return;
63 }
64
65 fc = le16_to_cpu(hdr->frame_control);
66 hdrlen = ieee80211_get_hdrlen(fc);
67 if (hdrlen > skb->len)
68 hdrlen = skb->len;
69 if (hdrlen >= 4)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc, le16_to_cpu(hdr->duration_id));
72 if (hdrlen >= 10)
73 printk(" A1=%s", print_mac(mac, hdr->addr1));
74 if (hdrlen >= 16)
75 printk(" A2=%s", print_mac(mac, hdr->addr2));
76 if (hdrlen >= 24)
77 printk(" A3=%s", print_mac(mac, hdr->addr3));
78 if (hdrlen >= 30)
79 printk(" A4=%s", print_mac(mac, hdr->addr4));
80 printk("\n");
81 }
82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
84 struct sk_buff *skb)
85 {
86 }
87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
88
89 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
90 int next_frag_len)
91 {
92 int rate, mrate, erp, dur, i;
93 struct ieee80211_rate *txrate = tx->u.tx.rate;
94 struct ieee80211_local *local = tx->local;
95 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
96
97 erp = txrate->flags & IEEE80211_RATE_ERP;
98
99 /*
100 * data and mgmt (except PS Poll):
101 * - during CFP: 32768
102 * - during contention period:
103 * if addr1 is group address: 0
104 * if more fragments = 0 and addr1 is individual address: time to
105 * transmit one ACK plus SIFS
106 * if more fragments = 1 and addr1 is individual address: time to
107 * transmit next fragment plus 2 x ACK plus 3 x SIFS
108 *
109 * IEEE 802.11, 9.6:
110 * - control response frame (CTS or ACK) shall be transmitted using the
111 * same rate as the immediately previous frame in the frame exchange
112 * sequence, if this rate belongs to the PHY mandatory rates, or else
113 * at the highest possible rate belonging to the PHY rates in the
114 * BSSBasicRateSet
115 */
116
117 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
118 /* TODO: These control frames are not currently sent by
119 * 80211.o, but should they be implemented, this function
120 * needs to be updated to support duration field calculation.
121 *
122 * RTS: time needed to transmit pending data/mgmt frame plus
123 * one CTS frame plus one ACK frame plus 3 x SIFS
124 * CTS: duration of immediately previous RTS minus time
125 * required to transmit CTS and its SIFS
126 * ACK: 0 if immediately previous directed data/mgmt had
127 * more=0, with more=1 duration in ACK frame is duration
128 * from previous frame minus time needed to transmit ACK
129 * and its SIFS
130 * PS Poll: BIT(15) | BIT(14) | aid
131 */
132 return 0;
133 }
134
135 /* data/mgmt */
136 if (0 /* FIX: data/mgmt during CFP */)
137 return 32768;
138
139 if (group_addr) /* Group address as the destination - no ACK */
140 return 0;
141
142 /* Individual destination address:
143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
144 * CTS and ACK frames shall be transmitted using the highest rate in
145 * basic rate set that is less than or equal to the rate of the
146 * immediately previous frame and that is using the same modulation
147 * (CCK or OFDM). If no basic rate set matches with these requirements,
148 * the highest mandatory rate of the PHY that is less than or equal to
149 * the rate of the previous frame is used.
150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
151 */
152 rate = -1;
153 mrate = 10; /* use 1 Mbps if everything fails */
154 for (i = 0; i < mode->num_rates; i++) {
155 struct ieee80211_rate *r = &mode->rates[i];
156 if (r->rate > txrate->rate)
157 break;
158
159 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
160 IEEE80211_RATE_MODULATION(r->flags))
161 continue;
162
163 if (r->flags & IEEE80211_RATE_BASIC)
164 rate = r->rate;
165 else if (r->flags & IEEE80211_RATE_MANDATORY)
166 mrate = r->rate;
167 }
168 if (rate == -1) {
169 /* No matching basic rate found; use highest suitable mandatory
170 * PHY rate */
171 rate = mrate;
172 }
173
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
177
178 dur = ieee80211_frame_duration(local, 10, rate, erp,
179 tx->sdata->bss_conf.use_short_preamble);
180
181 if (next_frag_len) {
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
185 /* next fragment */
186 dur += ieee80211_frame_duration(local, next_frag_len,
187 txrate->rate, erp,
188 tx->sdata->bss_conf.use_short_preamble);
189 }
190
191 return dur;
192 }
193
194 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
195 int queue)
196 {
197 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
198 }
199
200 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
201 int queue)
202 {
203 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
204 }
205
206 static int inline is_ieee80211_device(struct net_device *dev,
207 struct net_device *master)
208 {
209 return (wdev_priv(dev->ieee80211_ptr) ==
210 wdev_priv(master->ieee80211_ptr));
211 }
212
213 /* tx handlers */
214
215 static ieee80211_txrx_result
216 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
217 {
218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
219 struct sk_buff *skb = tx->skb;
220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
221 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
222 u32 sta_flags;
223
224 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
225 return TXRX_CONTINUE;
226
227 if (unlikely(tx->local->sta_sw_scanning) &&
228 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
229 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
230 return TXRX_DROP;
231
232 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
233 return TXRX_CONTINUE;
234
235 sta_flags = tx->sta ? tx->sta->flags : 0;
236
237 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
238 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
239 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
240 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
241 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
242 DECLARE_MAC_BUF(mac);
243 printk(KERN_DEBUG "%s: dropped data frame to not "
244 "associated station %s\n",
245 tx->dev->name, print_mac(mac, hdr->addr1));
246 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
247 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
248 return TXRX_DROP;
249 }
250 } else {
251 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
252 tx->local->num_sta == 0 &&
253 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
254 /*
255 * No associated STAs - no need to send multicast
256 * frames.
257 */
258 return TXRX_DROP;
259 }
260 return TXRX_CONTINUE;
261 }
262
263 return TXRX_CONTINUE;
264 }
265
266 static ieee80211_txrx_result
267 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
268 {
269 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
270
271 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
272 ieee80211_include_sequence(tx->sdata, hdr);
273
274 return TXRX_CONTINUE;
275 }
276
277 /* This function is called whenever the AP is about to exceed the maximum limit
278 * of buffered frames for power saving STAs. This situation should not really
279 * happen often during normal operation, so dropping the oldest buffered packet
280 * from each queue should be OK to make some room for new frames. */
281 static void purge_old_ps_buffers(struct ieee80211_local *local)
282 {
283 int total = 0, purged = 0;
284 struct sk_buff *skb;
285 struct ieee80211_sub_if_data *sdata;
286 struct sta_info *sta;
287
288 /*
289 * virtual interfaces are protected by RCU
290 */
291 rcu_read_lock();
292
293 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
294 struct ieee80211_if_ap *ap;
295 if (sdata->dev == local->mdev ||
296 sdata->vif.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 rcu_read_unlock();
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 wiphy_name(local->hw.wiphy), purged);
322 }
323
324 static ieee80211_txrx_result
325 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
326 {
327 /*
328 * broadcast/multicast frame
329 *
330 * If any of the associated stations is in power save mode,
331 * the frame is buffered to be sent after DTIM beacon frame.
332 * This is done either by the hardware or us.
333 */
334
335 /* not AP/IBSS or ordered frame */
336 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
337 return TXRX_CONTINUE;
338
339 /* no stations in PS mode */
340 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
341 return TXRX_CONTINUE;
342
343 /* buffered in mac80211 */
344 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
345 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
346 purge_old_ps_buffers(tx->local);
347 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
348 AP_MAX_BC_BUFFER) {
349 if (net_ratelimit()) {
350 printk(KERN_DEBUG "%s: BC TX buffer full - "
351 "dropping the oldest frame\n",
352 tx->dev->name);
353 }
354 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
355 } else
356 tx->local->total_ps_buffered++;
357 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
358 return TXRX_QUEUED;
359 }
360
361 /* buffered in hardware */
362 tx->u.tx.control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM;
363
364 return TXRX_CONTINUE;
365 }
366
367 static ieee80211_txrx_result
368 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
369 {
370 struct sta_info *sta = tx->sta;
371 DECLARE_MAC_BUF(mac);
372
373 if (unlikely(!sta ||
374 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
375 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
376 return TXRX_CONTINUE;
377
378 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
379 struct ieee80211_tx_packet_data *pkt_data;
380 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
381 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
382 "before %d)\n",
383 print_mac(mac, sta->addr), sta->aid,
384 skb_queue_len(&sta->ps_tx_buf));
385 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
386 sta->flags |= WLAN_STA_TIM;
387 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
388 purge_old_ps_buffers(tx->local);
389 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
390 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
391 if (net_ratelimit()) {
392 printk(KERN_DEBUG "%s: STA %s TX "
393 "buffer full - dropping oldest frame\n",
394 tx->dev->name, print_mac(mac, sta->addr));
395 }
396 dev_kfree_skb(old);
397 } else
398 tx->local->total_ps_buffered++;
399 /* Queue frame to be sent after STA sends an PS Poll frame */
400 if (skb_queue_empty(&sta->ps_tx_buf)) {
401 if (tx->local->ops->set_tim)
402 tx->local->ops->set_tim(local_to_hw(tx->local),
403 sta->aid, 1);
404 if (tx->sdata->bss)
405 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
406 }
407 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
408 pkt_data->jiffies = jiffies;
409 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
410 return TXRX_QUEUED;
411 }
412 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
413 else if (unlikely(sta->flags & WLAN_STA_PS)) {
414 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
415 "set -> send frame\n", tx->dev->name,
416 print_mac(mac, sta->addr));
417 }
418 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
419 sta->pspoll = 0;
420
421 return TXRX_CONTINUE;
422 }
423
424 static ieee80211_txrx_result
425 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
426 {
427 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
428 return TXRX_CONTINUE;
429
430 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
431 return ieee80211_tx_h_unicast_ps_buf(tx);
432 else
433 return ieee80211_tx_h_multicast_ps_buf(tx);
434 }
435
436 static ieee80211_txrx_result
437 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
438 {
439 struct ieee80211_key *key;
440 u16 fc = tx->fc;
441
442 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
443 tx->key = NULL;
444 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
445 tx->key = key;
446 else if ((key = rcu_dereference(tx->sdata->default_key)))
447 tx->key = key;
448 else if (tx->sdata->drop_unencrypted &&
449 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
450 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
451 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
452 return TXRX_DROP;
453 } else
454 tx->key = NULL;
455
456 if (tx->key) {
457 u16 ftype, stype;
458
459 tx->key->tx_rx_count++;
460 /* TODO: add threshold stuff again */
461
462 switch (tx->key->conf.alg) {
463 case ALG_WEP:
464 ftype = fc & IEEE80211_FCTL_FTYPE;
465 stype = fc & IEEE80211_FCTL_STYPE;
466
467 if (ftype == IEEE80211_FTYPE_MGMT &&
468 stype == IEEE80211_STYPE_AUTH)
469 break;
470 case ALG_TKIP:
471 case ALG_CCMP:
472 if (!WLAN_FC_DATA_PRESENT(fc))
473 tx->key = NULL;
474 break;
475 }
476 }
477
478 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
479 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
480
481 return TXRX_CONTINUE;
482 }
483
484 static ieee80211_txrx_result
485 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
486 {
487 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
488 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
489 struct sk_buff **frags, *first, *frag;
490 int i;
491 u16 seq;
492 u8 *pos;
493 int frag_threshold = tx->local->fragmentation_threshold;
494
495 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
496 return TXRX_CONTINUE;
497
498 first = tx->skb;
499
500 hdrlen = ieee80211_get_hdrlen(tx->fc);
501 payload_len = first->len - hdrlen;
502 per_fragm = frag_threshold - hdrlen - FCS_LEN;
503 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
504
505 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
506 if (!frags)
507 goto fail;
508
509 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
510 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
511 pos = first->data + hdrlen + per_fragm;
512 left = payload_len - per_fragm;
513 for (i = 0; i < num_fragm - 1; i++) {
514 struct ieee80211_hdr *fhdr;
515 size_t copylen;
516
517 if (left <= 0)
518 goto fail;
519
520 /* reserve enough extra head and tail room for possible
521 * encryption */
522 frag = frags[i] =
523 dev_alloc_skb(tx->local->tx_headroom +
524 frag_threshold +
525 IEEE80211_ENCRYPT_HEADROOM +
526 IEEE80211_ENCRYPT_TAILROOM);
527 if (!frag)
528 goto fail;
529 /* Make sure that all fragments use the same priority so
530 * that they end up using the same TX queue */
531 frag->priority = first->priority;
532 skb_reserve(frag, tx->local->tx_headroom +
533 IEEE80211_ENCRYPT_HEADROOM);
534 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
535 memcpy(fhdr, first->data, hdrlen);
536 if (i == num_fragm - 2)
537 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
538 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
539 copylen = left > per_fragm ? per_fragm : left;
540 memcpy(skb_put(frag, copylen), pos, copylen);
541
542 pos += copylen;
543 left -= copylen;
544 }
545 skb_trim(first, hdrlen + per_fragm);
546
547 tx->u.tx.num_extra_frag = num_fragm - 1;
548 tx->u.tx.extra_frag = frags;
549
550 return TXRX_CONTINUE;
551
552 fail:
553 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
554 if (frags) {
555 for (i = 0; i < num_fragm - 1; i++)
556 if (frags[i])
557 dev_kfree_skb(frags[i]);
558 kfree(frags);
559 }
560 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
561 return TXRX_DROP;
562 }
563
564 static ieee80211_txrx_result
565 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
566 {
567 if (!tx->key)
568 return TXRX_CONTINUE;
569
570 switch (tx->key->conf.alg) {
571 case ALG_WEP:
572 return ieee80211_crypto_wep_encrypt(tx);
573 case ALG_TKIP:
574 return ieee80211_crypto_tkip_encrypt(tx);
575 case ALG_CCMP:
576 return ieee80211_crypto_ccmp_encrypt(tx);
577 }
578
579 /* not reached */
580 WARN_ON(1);
581 return TXRX_DROP;
582 }
583
584 static ieee80211_txrx_result
585 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
586 {
587 struct rate_selection rsel;
588
589 if (likely(!tx->u.tx.rate)) {
590 rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel);
591 tx->u.tx.rate = rsel.rate;
592 if (unlikely(rsel.probe != NULL)) {
593 tx->u.tx.control->flags |=
594 IEEE80211_TXCTL_RATE_CTRL_PROBE;
595 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
596 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
597 tx->u.tx.rate = rsel.probe;
598 } else
599 tx->u.tx.control->alt_retry_rate = -1;
600
601 if (!tx->u.tx.rate)
602 return TXRX_DROP;
603 } else
604 tx->u.tx.control->alt_retry_rate = -1;
605
606 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
607 tx->sdata->bss_conf.use_cts_prot &&
608 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
609 tx->u.tx.last_frag_rate = tx->u.tx.rate;
610 if (rsel.probe)
611 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
612 else
613 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
614 tx->u.tx.rate = rsel.nonerp;
615 tx->u.tx.control->rate = rsel.nonerp;
616 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
617 } else {
618 tx->u.tx.last_frag_rate = tx->u.tx.rate;
619 tx->u.tx.control->rate = tx->u.tx.rate;
620 }
621 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
622
623 return TXRX_CONTINUE;
624 }
625
626 static ieee80211_txrx_result
627 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
628 {
629 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
630 u16 fc = le16_to_cpu(hdr->frame_control);
631 u16 dur;
632 struct ieee80211_tx_control *control = tx->u.tx.control;
633 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
634
635 if (!control->retry_limit) {
636 if (!is_multicast_ether_addr(hdr->addr1)) {
637 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
638 && tx->local->rts_threshold <
639 IEEE80211_MAX_RTS_THRESHOLD) {
640 control->flags |=
641 IEEE80211_TXCTL_USE_RTS_CTS;
642 control->flags |=
643 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
644 control->retry_limit =
645 tx->local->long_retry_limit;
646 } else {
647 control->retry_limit =
648 tx->local->short_retry_limit;
649 }
650 } else {
651 control->retry_limit = 1;
652 }
653 }
654
655 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
656 /* Do not use multiple retry rates when sending fragmented
657 * frames.
658 * TODO: The last fragment could still use multiple retry
659 * rates. */
660 control->alt_retry_rate = -1;
661 }
662
663 /* Use CTS protection for unicast frames sent using extended rates if
664 * there are associated non-ERP stations and RTS/CTS is not configured
665 * for the frame. */
666 if (mode->mode == MODE_IEEE80211G &&
667 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
668 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
669 tx->sdata->bss_conf.use_cts_prot &&
670 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
671 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
672
673 /* Transmit data frames using short preambles if the driver supports
674 * short preambles at the selected rate and short preambles are
675 * available on the network at the current point in time. */
676 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
677 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
678 tx->sdata->bss_conf.use_short_preamble &&
679 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
680 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
681 }
682
683 /* Setup duration field for the first fragment of the frame. Duration
684 * for remaining fragments will be updated when they are being sent
685 * to low-level driver in ieee80211_tx(). */
686 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
687 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
688 tx->u.tx.extra_frag[0]->len : 0);
689 hdr->duration_id = cpu_to_le16(dur);
690
691 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
692 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
693 struct ieee80211_rate *rate;
694
695 /* Do not use multiple retry rates when using RTS/CTS */
696 control->alt_retry_rate = -1;
697
698 /* Use min(data rate, max base rate) as CTS/RTS rate */
699 rate = tx->u.tx.rate;
700 while (rate > mode->rates &&
701 !(rate->flags & IEEE80211_RATE_BASIC))
702 rate--;
703
704 control->rts_cts_rate = rate->val;
705 control->rts_rate = rate;
706 }
707
708 if (tx->sta) {
709 tx->sta->tx_packets++;
710 tx->sta->tx_fragments++;
711 tx->sta->tx_bytes += tx->skb->len;
712 if (tx->u.tx.extra_frag) {
713 int i;
714 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
715 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
716 tx->sta->tx_bytes +=
717 tx->u.tx.extra_frag[i]->len;
718 }
719 }
720 }
721
722 return TXRX_CONTINUE;
723 }
724
725 static ieee80211_txrx_result
726 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
727 {
728 struct ieee80211_local *local = tx->local;
729 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
730 struct sk_buff *skb = tx->skb;
731 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
732 u32 load = 0, hdrtime;
733
734 /* TODO: this could be part of tx_status handling, so that the number
735 * of retries would be known; TX rate should in that case be stored
736 * somewhere with the packet */
737
738 /* Estimate total channel use caused by this frame */
739
740 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
741 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
742
743 if (mode->mode == MODE_IEEE80211A ||
744 (mode->mode == MODE_IEEE80211G &&
745 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
746 hdrtime = CHAN_UTIL_HDR_SHORT;
747 else
748 hdrtime = CHAN_UTIL_HDR_LONG;
749
750 load = hdrtime;
751 if (!is_multicast_ether_addr(hdr->addr1))
752 load += hdrtime;
753
754 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
755 load += 2 * hdrtime;
756 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
757 load += hdrtime;
758
759 load += skb->len * tx->u.tx.rate->rate_inv;
760
761 if (tx->u.tx.extra_frag) {
762 int i;
763 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
764 load += 2 * hdrtime;
765 load += tx->u.tx.extra_frag[i]->len *
766 tx->u.tx.rate->rate;
767 }
768 }
769
770 /* Divide channel_use by 8 to avoid wrapping around the counter */
771 load >>= CHAN_UTIL_SHIFT;
772 local->channel_use_raw += load;
773 if (tx->sta)
774 tx->sta->channel_use_raw += load;
775 tx->sdata->channel_use_raw += load;
776
777 return TXRX_CONTINUE;
778 }
779
780 /* TODO: implement register/unregister functions for adding TX/RX handlers
781 * into ordered list */
782
783 ieee80211_tx_handler ieee80211_tx_handlers[] =
784 {
785 ieee80211_tx_h_check_assoc,
786 ieee80211_tx_h_sequence,
787 ieee80211_tx_h_ps_buf,
788 ieee80211_tx_h_select_key,
789 ieee80211_tx_h_michael_mic_add,
790 ieee80211_tx_h_fragment,
791 ieee80211_tx_h_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 */
804 static ieee80211_txrx_result
805 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
806 struct sk_buff *skb)
807 {
808 /*
809 * this is the moment to interpret and discard the radiotap header that
810 * must be at the start of the packet injected in Monitor mode
811 *
812 * Need to take some care with endian-ness since radiotap
813 * args are little-endian
814 */
815
816 struct ieee80211_radiotap_iterator iterator;
817 struct ieee80211_radiotap_header *rthdr =
818 (struct ieee80211_radiotap_header *) skb->data;
819 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
820 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
821 struct ieee80211_tx_control *control = tx->u.tx.control;
822
823 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
824 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
825 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
826
827 /*
828 * for every radiotap entry that is present
829 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
830 * entries present, or -EINVAL on error)
831 */
832
833 while (!ret) {
834 int i, target_rate;
835
836 ret = ieee80211_radiotap_iterator_next(&iterator);
837
838 if (ret)
839 continue;
840
841 /* see if this argument is something we can use */
842 switch (iterator.this_arg_index) {
843 /*
844 * You must take care when dereferencing iterator.this_arg
845 * for multibyte types... the pointer is not aligned. Use
846 * get_unaligned((type *)iterator.this_arg) to dereference
847 * iterator.this_arg for type "type" safely on all arches.
848 */
849 case IEEE80211_RADIOTAP_RATE:
850 /*
851 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
852 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
853 */
854 target_rate = (*iterator.this_arg) * 5;
855 for (i = 0; i < mode->num_rates; i++) {
856 struct ieee80211_rate *r = &mode->rates[i];
857
858 if (r->rate == target_rate) {
859 tx->u.tx.rate = r;
860 break;
861 }
862 }
863 break;
864
865 case IEEE80211_RADIOTAP_ANTENNA:
866 /*
867 * radiotap uses 0 for 1st ant, mac80211 is 1 for
868 * 1st ant
869 */
870 control->antenna_sel_tx = (*iterator.this_arg) + 1;
871 break;
872
873 case IEEE80211_RADIOTAP_DBM_TX_POWER:
874 control->power_level = *iterator.this_arg;
875 break;
876
877 case IEEE80211_RADIOTAP_FLAGS:
878 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
879 /*
880 * this indicates that the skb we have been
881 * handed has the 32-bit FCS CRC at the end...
882 * we should react to that by snipping it off
883 * because it will be recomputed and added
884 * on transmission
885 */
886 if (skb->len < (iterator.max_length + FCS_LEN))
887 return TXRX_DROP;
888
889 skb_trim(skb, skb->len - FCS_LEN);
890 }
891 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
892 control->flags &=
893 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
894 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
895 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
896 break;
897
898 /*
899 * Please update the file
900 * Documentation/networking/mac80211-injection.txt
901 * when parsing new fields here.
902 */
903
904 default:
905 break;
906 }
907 }
908
909 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
910 return TXRX_DROP;
911
912 /*
913 * remove the radiotap header
914 * iterator->max_length was sanity-checked against
915 * skb->len by iterator init
916 */
917 skb_pull(skb, iterator.max_length);
918
919 return TXRX_CONTINUE;
920 }
921
922 /*
923 * initialises @tx
924 */
925 static ieee80211_txrx_result
926 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
927 struct sk_buff *skb,
928 struct net_device *dev,
929 struct ieee80211_tx_control *control)
930 {
931 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
932 struct ieee80211_hdr *hdr;
933 struct ieee80211_sub_if_data *sdata;
934
935 int hdrlen;
936
937 memset(tx, 0, sizeof(*tx));
938 tx->skb = skb;
939 tx->dev = dev; /* use original interface */
940 tx->local = local;
941 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
942 tx->u.tx.control = control;
943 /*
944 * Set this flag (used below to indicate "automatic fragmentation"),
945 * it will be cleared/left by radiotap as desired.
946 */
947 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
948
949 /* process and remove the injection radiotap header */
950 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
951 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
952 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
953 return TXRX_DROP;
954
955 /*
956 * __ieee80211_parse_tx_radiotap has now removed
957 * the radiotap header that was present and pre-filled
958 * 'tx' with tx control information.
959 */
960 }
961
962 hdr = (struct ieee80211_hdr *) skb->data;
963
964 tx->sta = sta_info_get(local, hdr->addr1);
965 tx->fc = le16_to_cpu(hdr->frame_control);
966
967 if (is_multicast_ether_addr(hdr->addr1)) {
968 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
969 control->flags |= IEEE80211_TXCTL_NO_ACK;
970 } else {
971 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
972 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
973 }
974
975 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
976 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
977 skb->len + FCS_LEN > local->fragmentation_threshold &&
978 !local->ops->set_frag_threshold)
979 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
980 else
981 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
982 }
983
984 if (!tx->sta)
985 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
986 else if (tx->sta->clear_dst_mask) {
987 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
988 tx->sta->clear_dst_mask = 0;
989 }
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 TXRX_CONTINUE;
999 }
1000
1001 /*
1002 * NB: @tx is uninitialised when passed in here
1003 */
1004 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1005 struct sk_buff *skb,
1006 struct net_device *mdev,
1007 struct ieee80211_tx_control *control)
1008 {
1009 struct ieee80211_tx_packet_data *pkt_data;
1010 struct net_device *dev;
1011
1012 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1013 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1014 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1015 dev_put(dev);
1016 dev = NULL;
1017 }
1018 if (unlikely(!dev))
1019 return -ENODEV;
1020 /* initialises tx with control */
1021 __ieee80211_tx_prepare(tx, skb, dev, control);
1022 dev_put(dev);
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(wiphy_name(local->hw.wiphy),
1039 "TX to low-level driver", skb);
1040 ret = local->ops->tx(local_to_hw(local), skb, control);
1041 if (ret)
1042 return IEEE80211_TX_AGAIN;
1043 local->mdev->trans_start = jiffies;
1044 ieee80211_led_tx(local, 1);
1045 }
1046 if (tx->u.tx.extra_frag) {
1047 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1048 IEEE80211_TXCTL_USE_CTS_PROTECT |
1049 IEEE80211_TXCTL_CLEAR_DST_MASK |
1050 IEEE80211_TXCTL_FIRST_FRAGMENT);
1051 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1052 if (!tx->u.tx.extra_frag[i])
1053 continue;
1054 if (__ieee80211_queue_stopped(local, control->queue))
1055 return IEEE80211_TX_FRAG_AGAIN;
1056 if (i == tx->u.tx.num_extra_frag) {
1057 control->tx_rate = tx->u.tx.last_frag_hwrate;
1058 control->rate = tx->u.tx.last_frag_rate;
1059 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1060 control->flags |=
1061 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1062 else
1063 control->flags &=
1064 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1065 }
1066
1067 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1068 "TX to low-level driver",
1069 tx->u.tx.extra_frag[i]);
1070 ret = local->ops->tx(local_to_hw(local),
1071 tx->u.tx.extra_frag[i],
1072 control);
1073 if (ret)
1074 return IEEE80211_TX_FRAG_AGAIN;
1075 local->mdev->trans_start = jiffies;
1076 ieee80211_led_tx(local, 1);
1077 tx->u.tx.extra_frag[i] = NULL;
1078 }
1079 kfree(tx->u.tx.extra_frag);
1080 tx->u.tx.extra_frag = NULL;
1081 }
1082 return IEEE80211_TX_OK;
1083 }
1084
1085 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1086 struct ieee80211_tx_control *control)
1087 {
1088 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1089 struct sta_info *sta;
1090 ieee80211_tx_handler *handler;
1091 struct ieee80211_txrx_data tx;
1092 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1093 int ret, i;
1094
1095 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1096
1097 if (unlikely(skb->len < 10)) {
1098 dev_kfree_skb(skb);
1099 return 0;
1100 }
1101
1102 /* initialises tx */
1103 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1104
1105 if (res_prepare == TXRX_DROP) {
1106 dev_kfree_skb(skb);
1107 return 0;
1108 }
1109
1110 /*
1111 * key references are protected using RCU and this requires that
1112 * we are in a read-site RCU section during receive processing
1113 */
1114 rcu_read_lock();
1115
1116 sta = tx.sta;
1117 tx.u.tx.mode = local->hw.conf.mode;
1118
1119 for (handler = local->tx_handlers; *handler != NULL;
1120 handler++) {
1121 res = (*handler)(&tx);
1122 if (res != TXRX_CONTINUE)
1123 break;
1124 }
1125
1126 skb = tx.skb; /* handlers are allowed to change skb */
1127
1128 if (sta)
1129 sta_info_put(sta);
1130
1131 if (unlikely(res == TXRX_DROP)) {
1132 I802_DEBUG_INC(local->tx_handlers_drop);
1133 goto drop;
1134 }
1135
1136 if (unlikely(res == TXRX_QUEUED)) {
1137 I802_DEBUG_INC(local->tx_handlers_queued);
1138 rcu_read_unlock();
1139 return 0;
1140 }
1141
1142 if (tx.u.tx.extra_frag) {
1143 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1144 int next_len, dur;
1145 struct ieee80211_hdr *hdr =
1146 (struct ieee80211_hdr *)
1147 tx.u.tx.extra_frag[i]->data;
1148
1149 if (i + 1 < tx.u.tx.num_extra_frag) {
1150 next_len = tx.u.tx.extra_frag[i + 1]->len;
1151 } else {
1152 next_len = 0;
1153 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1154 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1155 }
1156 dur = ieee80211_duration(&tx, 0, next_len);
1157 hdr->duration_id = cpu_to_le16(dur);
1158 }
1159 }
1160
1161 retry:
1162 ret = __ieee80211_tx(local, skb, &tx);
1163 if (ret) {
1164 struct ieee80211_tx_stored_packet *store =
1165 &local->pending_packet[control->queue];
1166
1167 if (ret == IEEE80211_TX_FRAG_AGAIN)
1168 skb = NULL;
1169 set_bit(IEEE80211_LINK_STATE_PENDING,
1170 &local->state[control->queue]);
1171 smp_mb();
1172 /* When the driver gets out of buffers during sending of
1173 * fragments and calls ieee80211_stop_queue, there is
1174 * a small window between IEEE80211_LINK_STATE_XOFF and
1175 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1176 * gets available in that window (i.e. driver calls
1177 * ieee80211_wake_queue), we would end up with ieee80211_tx
1178 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1179 * continuing transmitting here when that situation is
1180 * possible to have happened. */
1181 if (!__ieee80211_queue_stopped(local, control->queue)) {
1182 clear_bit(IEEE80211_LINK_STATE_PENDING,
1183 &local->state[control->queue]);
1184 goto retry;
1185 }
1186 memcpy(&store->control, control,
1187 sizeof(struct ieee80211_tx_control));
1188 store->skb = skb;
1189 store->extra_frag = tx.u.tx.extra_frag;
1190 store->num_extra_frag = tx.u.tx.num_extra_frag;
1191 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1192 store->last_frag_rate = tx.u.tx.last_frag_rate;
1193 store->last_frag_rate_ctrl_probe =
1194 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1195 }
1196 rcu_read_unlock();
1197 return 0;
1198
1199 drop:
1200 if (skb)
1201 dev_kfree_skb(skb);
1202 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1203 if (tx.u.tx.extra_frag[i])
1204 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1205 kfree(tx.u.tx.extra_frag);
1206 rcu_read_unlock();
1207 return 0;
1208 }
1209
1210 /* device xmit handlers */
1211
1212 int ieee80211_master_start_xmit(struct sk_buff *skb,
1213 struct net_device *dev)
1214 {
1215 struct ieee80211_tx_control control;
1216 struct ieee80211_tx_packet_data *pkt_data;
1217 struct net_device *odev = NULL;
1218 struct ieee80211_sub_if_data *osdata;
1219 int headroom;
1220 int ret;
1221
1222 /*
1223 * copy control out of the skb so other people can use skb->cb
1224 */
1225 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1226 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1227
1228 if (pkt_data->ifindex)
1229 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1230 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1231 dev_put(odev);
1232 odev = NULL;
1233 }
1234 if (unlikely(!odev)) {
1235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1236 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1237 "originating device\n", dev->name);
1238 #endif
1239 dev_kfree_skb(skb);
1240 return 0;
1241 }
1242 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1243
1244 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1245 if (skb_headroom(skb) < headroom) {
1246 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1247 dev_kfree_skb(skb);
1248 dev_put(odev);
1249 return 0;
1250 }
1251 }
1252
1253 control.vif = &osdata->vif;
1254 control.type = osdata->vif.type;
1255 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1256 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1257 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1258 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1259 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1260 control.flags |= IEEE80211_TXCTL_REQUEUE;
1261 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
1262 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
1263 control.queue = pkt_data->queue;
1264
1265 ret = ieee80211_tx(odev, skb, &control);
1266 dev_put(odev);
1267
1268 return ret;
1269 }
1270
1271 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1272 struct net_device *dev)
1273 {
1274 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1275 struct ieee80211_tx_packet_data *pkt_data;
1276 struct ieee80211_radiotap_header *prthdr =
1277 (struct ieee80211_radiotap_header *)skb->data;
1278 u16 len_rthdr;
1279
1280 /* check for not even having the fixed radiotap header part */
1281 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1282 goto fail; /* too short to be possibly valid */
1283
1284 /* is it a header version we can trust to find length from? */
1285 if (unlikely(prthdr->it_version))
1286 goto fail; /* only version 0 is supported */
1287
1288 /* then there must be a radiotap header with a length we can use */
1289 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1290
1291 /* does the skb contain enough to deliver on the alleged length? */
1292 if (unlikely(skb->len < len_rthdr))
1293 goto fail; /* skb too short for claimed rt header extent */
1294
1295 skb->dev = local->mdev;
1296
1297 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1298 memset(pkt_data, 0, sizeof(*pkt_data));
1299 /* needed because we set skb device to master */
1300 pkt_data->ifindex = dev->ifindex;
1301
1302 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1303
1304 /*
1305 * fix up the pointers accounting for the radiotap
1306 * header still being in there. We are being given
1307 * a precooked IEEE80211 header so no need for
1308 * normal processing
1309 */
1310 skb_set_mac_header(skb, len_rthdr);
1311 /*
1312 * these are just fixed to the end of the rt area since we
1313 * don't have any better information and at this point, nobody cares
1314 */
1315 skb_set_network_header(skb, len_rthdr);
1316 skb_set_transport_header(skb, len_rthdr);
1317
1318 /* pass the radiotap header up to the next stage intact */
1319 dev_queue_xmit(skb);
1320 return NETDEV_TX_OK;
1321
1322 fail:
1323 dev_kfree_skb(skb);
1324 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1325 }
1326
1327 /**
1328 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1329 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1330 * @skb: packet to be sent
1331 * @dev: incoming interface
1332 *
1333 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1334 * not be freed, and caller is responsible for either retrying later or freeing
1335 * skb).
1336 *
1337 * This function takes in an Ethernet header and encapsulates it with suitable
1338 * IEEE 802.11 header based on which interface the packet is coming in. The
1339 * encapsulated packet will then be passed to master interface, wlan#.11, for
1340 * transmission (through low-level driver).
1341 */
1342 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1343 struct net_device *dev)
1344 {
1345 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1346 struct ieee80211_tx_packet_data *pkt_data;
1347 struct ieee80211_sub_if_data *sdata;
1348 int ret = 1, head_need;
1349 u16 ethertype, hdrlen, fc;
1350 struct ieee80211_hdr hdr;
1351 const u8 *encaps_data;
1352 int encaps_len, skip_header_bytes;
1353 int nh_pos, h_pos;
1354 struct sta_info *sta;
1355 u32 sta_flags = 0;
1356
1357 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1358 if (unlikely(skb->len < ETH_HLEN)) {
1359 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1360 dev->name, skb->len);
1361 ret = 0;
1362 goto fail;
1363 }
1364
1365 nh_pos = skb_network_header(skb) - skb->data;
1366 h_pos = skb_transport_header(skb) - skb->data;
1367
1368 /* convert Ethernet header to proper 802.11 header (based on
1369 * operation mode) */
1370 ethertype = (skb->data[12] << 8) | skb->data[13];
1371 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1372
1373 switch (sdata->vif.type) {
1374 case IEEE80211_IF_TYPE_AP:
1375 case IEEE80211_IF_TYPE_VLAN:
1376 fc |= IEEE80211_FCTL_FROMDS;
1377 /* DA BSSID SA */
1378 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1379 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1380 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1381 hdrlen = 24;
1382 break;
1383 case IEEE80211_IF_TYPE_WDS:
1384 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1385 /* RA TA DA SA */
1386 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1387 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1388 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1389 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1390 hdrlen = 30;
1391 break;
1392 case IEEE80211_IF_TYPE_STA:
1393 fc |= IEEE80211_FCTL_TODS;
1394 /* BSSID SA DA */
1395 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1396 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1397 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1398 hdrlen = 24;
1399 break;
1400 case IEEE80211_IF_TYPE_IBSS:
1401 /* DA SA BSSID */
1402 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1403 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1404 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1405 hdrlen = 24;
1406 break;
1407 default:
1408 ret = 0;
1409 goto fail;
1410 }
1411
1412 sta = sta_info_get(local, hdr.addr1);
1413 if (sta) {
1414 sta_flags = sta->flags;
1415 sta_info_put(sta);
1416 }
1417
1418 /* receiver is QoS enabled, use a QoS type frame */
1419 if (sta_flags & WLAN_STA_WME) {
1420 fc |= IEEE80211_STYPE_QOS_DATA;
1421 hdrlen += 2;
1422 }
1423
1424 /*
1425 * If port access control is enabled, drop frames to unauthorised
1426 * stations unless they are EAPOL frames from the local station.
1427 */
1428 if (unlikely(sdata->ieee802_1x_pac &&
1429 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1430 !(ethertype == ETH_P_PAE &&
1431 compare_ether_addr(dev->dev_addr,
1432 skb->data + ETH_ALEN) == 0))) {
1433 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1434 DECLARE_MAC_BUF(mac);
1435
1436 if (net_ratelimit())
1437 printk(KERN_DEBUG "%s: dropped frame to %s"
1438 " (unauthorized port)\n", dev->name,
1439 print_mac(mac, hdr.addr1));
1440 #endif
1441
1442 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1443
1444 ret = 0;
1445 goto fail;
1446 }
1447
1448 hdr.frame_control = cpu_to_le16(fc);
1449 hdr.duration_id = 0;
1450 hdr.seq_ctrl = 0;
1451
1452 skip_header_bytes = ETH_HLEN;
1453 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1454 encaps_data = bridge_tunnel_header;
1455 encaps_len = sizeof(bridge_tunnel_header);
1456 skip_header_bytes -= 2;
1457 } else if (ethertype >= 0x600) {
1458 encaps_data = rfc1042_header;
1459 encaps_len = sizeof(rfc1042_header);
1460 skip_header_bytes -= 2;
1461 } else {
1462 encaps_data = NULL;
1463 encaps_len = 0;
1464 }
1465
1466 skb_pull(skb, skip_header_bytes);
1467 nh_pos -= skip_header_bytes;
1468 h_pos -= skip_header_bytes;
1469
1470 /* TODO: implement support for fragments so that there is no need to
1471 * reallocate and copy payload; it might be enough to support one
1472 * extra fragment that would be copied in the beginning of the frame
1473 * data.. anyway, it would be nice to include this into skb structure
1474 * somehow
1475 *
1476 * There are few options for this:
1477 * use skb->cb as an extra space for 802.11 header
1478 * allocate new buffer if not enough headroom
1479 * make sure that there is enough headroom in every skb by increasing
1480 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1481 * alloc_skb() (net/core/skbuff.c)
1482 */
1483 head_need = hdrlen + encaps_len + local->tx_headroom;
1484 head_need -= skb_headroom(skb);
1485
1486 /* We are going to modify skb data, so make a copy of it if happens to
1487 * be cloned. This could happen, e.g., with Linux bridge code passing
1488 * us broadcast frames. */
1489
1490 if (head_need > 0 || skb_cloned(skb)) {
1491 #if 0
1492 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1493 "of headroom\n", dev->name, head_need);
1494 #endif
1495
1496 if (skb_cloned(skb))
1497 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1498 else
1499 I802_DEBUG_INC(local->tx_expand_skb_head);
1500 /* Since we have to reallocate the buffer, make sure that there
1501 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1502 * before payload and 12 after). */
1503 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1504 12, GFP_ATOMIC)) {
1505 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1506 "\n", dev->name);
1507 goto fail;
1508 }
1509 }
1510
1511 if (encaps_data) {
1512 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1513 nh_pos += encaps_len;
1514 h_pos += encaps_len;
1515 }
1516
1517 if (fc & IEEE80211_STYPE_QOS_DATA) {
1518 __le16 *qos_control;
1519
1520 qos_control = (__le16*) skb_push(skb, 2);
1521 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1522 /*
1523 * Maybe we could actually set some fields here, for now just
1524 * initialise to zero to indicate no special operation.
1525 */
1526 *qos_control = 0;
1527 } else
1528 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1529
1530 nh_pos += hdrlen;
1531 h_pos += hdrlen;
1532
1533 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1534 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1535 pkt_data->ifindex = dev->ifindex;
1536 if (ethertype == ETH_P_PAE)
1537 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1538
1539 skb->dev = local->mdev;
1540 dev->stats.tx_packets++;
1541 dev->stats.tx_bytes += skb->len;
1542
1543 /* Update skb pointers to various headers since this modified frame
1544 * is going to go through Linux networking code that may potentially
1545 * need things like pointer to IP header. */
1546 skb_set_mac_header(skb, 0);
1547 skb_set_network_header(skb, nh_pos);
1548 skb_set_transport_header(skb, h_pos);
1549
1550 dev->trans_start = jiffies;
1551 dev_queue_xmit(skb);
1552
1553 return 0;
1554
1555 fail:
1556 if (!ret)
1557 dev_kfree_skb(skb);
1558
1559 return ret;
1560 }
1561
1562 /* helper functions for pending packets for when queues are stopped */
1563
1564 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1565 {
1566 int i, j;
1567 struct ieee80211_tx_stored_packet *store;
1568
1569 for (i = 0; i < local->hw.queues; i++) {
1570 if (!__ieee80211_queue_pending(local, i))
1571 continue;
1572 store = &local->pending_packet[i];
1573 kfree_skb(store->skb);
1574 for (j = 0; j < store->num_extra_frag; j++)
1575 kfree_skb(store->extra_frag[j]);
1576 kfree(store->extra_frag);
1577 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1578 }
1579 }
1580
1581 void ieee80211_tx_pending(unsigned long data)
1582 {
1583 struct ieee80211_local *local = (struct ieee80211_local *)data;
1584 struct net_device *dev = local->mdev;
1585 struct ieee80211_tx_stored_packet *store;
1586 struct ieee80211_txrx_data tx;
1587 int i, ret, reschedule = 0;
1588
1589 netif_tx_lock_bh(dev);
1590 for (i = 0; i < local->hw.queues; i++) {
1591 if (__ieee80211_queue_stopped(local, i))
1592 continue;
1593 if (!__ieee80211_queue_pending(local, i)) {
1594 reschedule = 1;
1595 continue;
1596 }
1597 store = &local->pending_packet[i];
1598 tx.u.tx.control = &store->control;
1599 tx.u.tx.extra_frag = store->extra_frag;
1600 tx.u.tx.num_extra_frag = store->num_extra_frag;
1601 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1602 tx.u.tx.last_frag_rate = store->last_frag_rate;
1603 tx.flags = 0;
1604 if (store->last_frag_rate_ctrl_probe)
1605 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1606 ret = __ieee80211_tx(local, store->skb, &tx);
1607 if (ret) {
1608 if (ret == IEEE80211_TX_FRAG_AGAIN)
1609 store->skb = NULL;
1610 } else {
1611 clear_bit(IEEE80211_LINK_STATE_PENDING,
1612 &local->state[i]);
1613 reschedule = 1;
1614 }
1615 }
1616 netif_tx_unlock_bh(dev);
1617 if (reschedule) {
1618 if (!ieee80211_qdisc_installed(dev)) {
1619 if (!__ieee80211_queue_stopped(local, 0))
1620 netif_wake_queue(dev);
1621 } else
1622 netif_schedule(dev);
1623 }
1624 }
1625
1626 /* functions for drivers to get certain frames */
1627
1628 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1629 struct ieee80211_if_ap *bss,
1630 struct sk_buff *skb,
1631 struct beacon_data *beacon)
1632 {
1633 u8 *pos, *tim;
1634 int aid0 = 0;
1635 int i, have_bits = 0, n1, n2;
1636
1637 /* Generate bitmap for TIM only if there are any STAs in power save
1638 * mode. */
1639 read_lock_bh(&local->sta_lock);
1640 if (atomic_read(&bss->num_sta_ps) > 0)
1641 /* in the hope that this is faster than
1642 * checking byte-for-byte */
1643 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1644 IEEE80211_MAX_AID+1);
1645
1646 if (bss->dtim_count == 0)
1647 bss->dtim_count = beacon->dtim_period - 1;
1648 else
1649 bss->dtim_count--;
1650
1651 tim = pos = (u8 *) skb_put(skb, 6);
1652 *pos++ = WLAN_EID_TIM;
1653 *pos++ = 4;
1654 *pos++ = bss->dtim_count;
1655 *pos++ = beacon->dtim_period;
1656
1657 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1658 aid0 = 1;
1659
1660 if (have_bits) {
1661 /* Find largest even number N1 so that bits numbered 1 through
1662 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1663 * (N2 + 1) x 8 through 2007 are 0. */
1664 n1 = 0;
1665 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1666 if (bss->tim[i]) {
1667 n1 = i & 0xfe;
1668 break;
1669 }
1670 }
1671 n2 = n1;
1672 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1673 if (bss->tim[i]) {
1674 n2 = i;
1675 break;
1676 }
1677 }
1678
1679 /* Bitmap control */
1680 *pos++ = n1 | aid0;
1681 /* Part Virt Bitmap */
1682 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1683
1684 tim[1] = n2 - n1 + 4;
1685 skb_put(skb, n2 - n1);
1686 } else {
1687 *pos++ = aid0; /* Bitmap control */
1688 *pos++ = 0; /* Part Virt Bitmap */
1689 }
1690 read_unlock_bh(&local->sta_lock);
1691 }
1692
1693 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1694 struct ieee80211_vif *vif,
1695 struct ieee80211_tx_control *control)
1696 {
1697 struct ieee80211_local *local = hw_to_local(hw);
1698 struct sk_buff *skb;
1699 struct net_device *bdev;
1700 struct ieee80211_sub_if_data *sdata = NULL;
1701 struct ieee80211_if_ap *ap = NULL;
1702 struct rate_selection rsel;
1703 struct beacon_data *beacon;
1704
1705 rcu_read_lock();
1706
1707 sdata = vif_to_sdata(vif);
1708 bdev = sdata->dev;
1709 ap = &sdata->u.ap;
1710
1711 beacon = rcu_dereference(ap->beacon);
1712
1713 if (!ap || sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon) {
1714 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1715 if (net_ratelimit())
1716 printk(KERN_DEBUG "no beacon data avail for %s\n",
1717 bdev->name);
1718 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1719 skb = NULL;
1720 goto out;
1721 }
1722
1723 /* headroom, head length, tail length and maximum TIM length */
1724 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
1725 beacon->tail_len + 256);
1726 if (!skb)
1727 goto out;
1728
1729 skb_reserve(skb, local->tx_headroom);
1730 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1731 beacon->head_len);
1732
1733 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1734
1735 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1736
1737 if (beacon->tail)
1738 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
1739 beacon->tail_len);
1740
1741 if (control) {
1742 rate_control_get_rate(local->mdev, local->oper_hw_mode, skb,
1743 &rsel);
1744 if (!rsel.rate) {
1745 if (net_ratelimit()) {
1746 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1747 "no rate found\n",
1748 wiphy_name(local->hw.wiphy));
1749 }
1750 dev_kfree_skb(skb);
1751 skb = NULL;
1752 goto out;
1753 }
1754
1755 control->vif = vif;
1756 control->tx_rate =
1757 (sdata->bss_conf.use_short_preamble &&
1758 (rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1759 rsel.rate->val2 : rsel.rate->val;
1760 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1761 control->power_level = local->hw.conf.power_level;
1762 control->flags |= IEEE80211_TXCTL_NO_ACK;
1763 control->retry_limit = 1;
1764 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1765 }
1766
1767 ap->num_beacons++;
1768
1769 out:
1770 rcu_read_unlock();
1771 return skb;
1772 }
1773 EXPORT_SYMBOL(ieee80211_beacon_get);
1774
1775 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1776 const void *frame, size_t frame_len,
1777 const struct ieee80211_tx_control *frame_txctl,
1778 struct ieee80211_rts *rts)
1779 {
1780 const struct ieee80211_hdr *hdr = frame;
1781 u16 fctl;
1782
1783 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1784 rts->frame_control = cpu_to_le16(fctl);
1785 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1786 frame_txctl);
1787 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1788 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1789 }
1790 EXPORT_SYMBOL(ieee80211_rts_get);
1791
1792 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1793 const void *frame, size_t frame_len,
1794 const struct ieee80211_tx_control *frame_txctl,
1795 struct ieee80211_cts *cts)
1796 {
1797 const struct ieee80211_hdr *hdr = frame;
1798 u16 fctl;
1799
1800 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1801 cts->frame_control = cpu_to_le16(fctl);
1802 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1803 frame_len, frame_txctl);
1804 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1805 }
1806 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1807
1808 struct sk_buff *
1809 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1810 struct ieee80211_vif *vif,
1811 struct ieee80211_tx_control *control)
1812 {
1813 struct ieee80211_local *local = hw_to_local(hw);
1814 struct sk_buff *skb;
1815 struct sta_info *sta;
1816 ieee80211_tx_handler *handler;
1817 struct ieee80211_txrx_data tx;
1818 ieee80211_txrx_result res = TXRX_DROP;
1819 struct net_device *bdev;
1820 struct ieee80211_sub_if_data *sdata;
1821 struct ieee80211_if_ap *bss = NULL;
1822 struct beacon_data *beacon;
1823
1824 sdata = vif_to_sdata(vif);
1825 bdev = sdata->dev;
1826
1827
1828 if (!bss)
1829 return NULL;
1830
1831 rcu_read_lock();
1832 beacon = rcu_dereference(bss->beacon);
1833
1834 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1835 !beacon->head) {
1836 rcu_read_unlock();
1837 return NULL;
1838 }
1839 rcu_read_unlock();
1840
1841 if (bss->dtim_count != 0)
1842 return NULL; /* send buffered bc/mc only after DTIM beacon */
1843 memset(control, 0, sizeof(*control));
1844 while (1) {
1845 skb = skb_dequeue(&bss->ps_bc_buf);
1846 if (!skb)
1847 return NULL;
1848 local->total_ps_buffered--;
1849
1850 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1851 struct ieee80211_hdr *hdr =
1852 (struct ieee80211_hdr *) skb->data;
1853 /* more buffered multicast/broadcast frames ==> set
1854 * MoreData flag in IEEE 802.11 header to inform PS
1855 * STAs */
1856 hdr->frame_control |=
1857 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1858 }
1859
1860 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1861 break;
1862 dev_kfree_skb_any(skb);
1863 }
1864 sta = tx.sta;
1865 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1866 tx.u.tx.mode = local->hw.conf.mode;
1867
1868 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1869 res = (*handler)(&tx);
1870 if (res == TXRX_DROP || res == TXRX_QUEUED)
1871 break;
1872 }
1873 skb = tx.skb; /* handlers are allowed to change skb */
1874
1875 if (res == TXRX_DROP) {
1876 I802_DEBUG_INC(local->tx_handlers_drop);
1877 dev_kfree_skb(skb);
1878 skb = NULL;
1879 } else if (res == TXRX_QUEUED) {
1880 I802_DEBUG_INC(local->tx_handlers_queued);
1881 skb = NULL;
1882 }
1883
1884 if (sta)
1885 sta_info_put(sta);
1886
1887 return skb;
1888 }
1889 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
WRT350N Kernel Patches