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[CAN]: Add raw protocol
[linux-2.6/kvm.git] / net / mac80211 / tx.c
blob1a531543bccb79df167148c001ee0c26c45bb079
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->flags & IEEE80211_SDATA_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->flags &
189 IEEE80211_SDATA_SHORT_PREAMBLE);
190 }
191
192 return dur;
193 }
194
195 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
196 int queue)
197 {
198 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
199 }
200
201 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
202 int queue)
203 {
204 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
205 }
206
207 static int inline is_ieee80211_device(struct net_device *dev,
208 struct net_device *master)
209 {
210 return (wdev_priv(dev->ieee80211_ptr) ==
211 wdev_priv(master->ieee80211_ptr));
212 }
213
214 /* tx handlers */
215
216 static ieee80211_txrx_result
217 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
218 {
219 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
220 struct sk_buff *skb = tx->skb;
221 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
222 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
223 u32 sta_flags;
224
225 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
226 return TXRX_CONTINUE;
227
228 if (unlikely(tx->local->sta_scanning != 0) &&
229 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
230 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
231 return TXRX_DROP;
232
233 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
234 return TXRX_CONTINUE;
235
236 sta_flags = tx->sta ? tx->sta->flags : 0;
237
238 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
239 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
240 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
241 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
242 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
243 DECLARE_MAC_BUF(mac);
244 printk(KERN_DEBUG "%s: dropped data frame to not "
245 "associated station %s\n",
246 tx->dev->name, print_mac(mac, hdr->addr1));
247 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
248 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
249 return TXRX_DROP;
250 }
251 } else {
252 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
253 tx->local->num_sta == 0 &&
254 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
255 /*
256 * No associated STAs - no need to send multicast
257 * frames.
258 */
259 return TXRX_DROP;
260 }
261 return TXRX_CONTINUE;
262 }
263
264 if (unlikely(/* !injected && */ tx->sdata->ieee802_1x &&
265 !(sta_flags & WLAN_STA_AUTHORIZED))) {
266 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
267 DECLARE_MAC_BUF(mac);
268 printk(KERN_DEBUG "%s: dropped frame to %s"
269 " (unauthorized port)\n", tx->dev->name,
270 print_mac(mac, hdr->addr1));
271 #endif
272 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
273 return TXRX_DROP;
274 }
275
276 return TXRX_CONTINUE;
277 }
278
279 static ieee80211_txrx_result
280 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
281 {
282 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
283
284 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
285 ieee80211_include_sequence(tx->sdata, hdr);
286
287 return TXRX_CONTINUE;
288 }
289
290 /* This function is called whenever the AP is about to exceed the maximum limit
291 * of buffered frames for power saving STAs. This situation should not really
292 * happen often during normal operation, so dropping the oldest buffered packet
293 * from each queue should be OK to make some room for new frames. */
294 static void purge_old_ps_buffers(struct ieee80211_local *local)
295 {
296 int total = 0, purged = 0;
297 struct sk_buff *skb;
298 struct ieee80211_sub_if_data *sdata;
299 struct sta_info *sta;
300
301 /*
302 * virtual interfaces are protected by RCU
303 */
304 rcu_read_lock();
305
306 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
307 struct ieee80211_if_ap *ap;
308 if (sdata->dev == local->mdev ||
309 sdata->type != IEEE80211_IF_TYPE_AP)
310 continue;
311 ap = &sdata->u.ap;
312 skb = skb_dequeue(&ap->ps_bc_buf);
313 if (skb) {
314 purged++;
315 dev_kfree_skb(skb);
316 }
317 total += skb_queue_len(&ap->ps_bc_buf);
318 }
319 rcu_read_unlock();
320
321 read_lock_bh(&local->sta_lock);
322 list_for_each_entry(sta, &local->sta_list, list) {
323 skb = skb_dequeue(&sta->ps_tx_buf);
324 if (skb) {
325 purged++;
326 dev_kfree_skb(skb);
327 }
328 total += skb_queue_len(&sta->ps_tx_buf);
329 }
330 read_unlock_bh(&local->sta_lock);
331
332 local->total_ps_buffered = total;
333 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
334 wiphy_name(local->hw.wiphy), purged);
335 }
336
337 static inline ieee80211_txrx_result
338 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
339 {
340 /* broadcast/multicast frame */
341 /* If any of the associated stations is in power save mode,
342 * the frame is buffered to be sent after DTIM beacon frame */
343 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
344 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
345 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
346 !(tx->fc & IEEE80211_FCTL_ORDER)) {
347 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
348 purge_old_ps_buffers(tx->local);
349 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
350 AP_MAX_BC_BUFFER) {
351 if (net_ratelimit()) {
352 printk(KERN_DEBUG "%s: BC TX buffer full - "
353 "dropping the oldest frame\n",
354 tx->dev->name);
355 }
356 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
357 } else
358 tx->local->total_ps_buffered++;
359 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
360 return TXRX_QUEUED;
361 }
362
363 return TXRX_CONTINUE;
364 }
365
366 static inline ieee80211_txrx_result
367 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
368 {
369 struct sta_info *sta = tx->sta;
370 DECLARE_MAC_BUF(mac);
371
372 if (unlikely(!sta ||
373 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
374 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
375 return TXRX_CONTINUE;
376
377 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
378 struct ieee80211_tx_packet_data *pkt_data;
379 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
380 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
381 "before %d)\n",
382 print_mac(mac, sta->addr), sta->aid,
383 skb_queue_len(&sta->ps_tx_buf));
384 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
385 sta->flags |= WLAN_STA_TIM;
386 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
387 purge_old_ps_buffers(tx->local);
388 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
389 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
390 if (net_ratelimit()) {
391 printk(KERN_DEBUG "%s: STA %s TX "
392 "buffer full - dropping oldest frame\n",
393 tx->dev->name, print_mac(mac, sta->addr));
394 }
395 dev_kfree_skb(old);
396 } else
397 tx->local->total_ps_buffered++;
398 /* Queue frame to be sent after STA sends an PS Poll frame */
399 if (skb_queue_empty(&sta->ps_tx_buf)) {
400 if (tx->local->ops->set_tim)
401 tx->local->ops->set_tim(local_to_hw(tx->local),
402 sta->aid, 1);
403 if (tx->sdata->bss)
404 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
405 }
406 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
407 pkt_data->jiffies = jiffies;
408 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
409 return TXRX_QUEUED;
410 }
411 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
412 else if (unlikely(sta->flags & WLAN_STA_PS)) {
413 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
414 "set -> send frame\n", tx->dev->name,
415 print_mac(mac, sta->addr));
416 }
417 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
418 sta->pspoll = 0;
419
420 return TXRX_CONTINUE;
421 }
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
437
438
439 static ieee80211_txrx_result
440 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
441 {
442 struct ieee80211_key *key;
443
444 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
445 tx->key = NULL;
446 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
447 tx->key = key;
448 else if ((key = rcu_dereference(tx->sdata->default_key)))
449 tx->key = key;
450 else if (tx->sdata->drop_unencrypted &&
451 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
452 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
453 return TXRX_DROP;
454 } else {
455 tx->key = NULL;
456 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
457 }
458
459 if (tx->key) {
460 tx->key->tx_rx_count++;
461 /* TODO: add threshold stuff again */
462 }
463
464 return TXRX_CONTINUE;
465 }
466
467 static ieee80211_txrx_result
468 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
469 {
470 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
471 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
472 struct sk_buff **frags, *first, *frag;
473 int i;
474 u16 seq;
475 u8 *pos;
476 int frag_threshold = tx->local->fragmentation_threshold;
477
478 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
479 return TXRX_CONTINUE;
480
481 first = tx->skb;
482
483 hdrlen = ieee80211_get_hdrlen(tx->fc);
484 payload_len = first->len - hdrlen;
485 per_fragm = frag_threshold - hdrlen - FCS_LEN;
486 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
487
488 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
489 if (!frags)
490 goto fail;
491
492 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
493 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
494 pos = first->data + hdrlen + per_fragm;
495 left = payload_len - per_fragm;
496 for (i = 0; i < num_fragm - 1; i++) {
497 struct ieee80211_hdr *fhdr;
498 size_t copylen;
499
500 if (left <= 0)
501 goto fail;
502
503 /* reserve enough extra head and tail room for possible
504 * encryption */
505 frag = frags[i] =
506 dev_alloc_skb(tx->local->tx_headroom +
507 frag_threshold +
508 IEEE80211_ENCRYPT_HEADROOM +
509 IEEE80211_ENCRYPT_TAILROOM);
510 if (!frag)
511 goto fail;
512 /* Make sure that all fragments use the same priority so
513 * that they end up using the same TX queue */
514 frag->priority = first->priority;
515 skb_reserve(frag, tx->local->tx_headroom +
516 IEEE80211_ENCRYPT_HEADROOM);
517 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
518 memcpy(fhdr, first->data, hdrlen);
519 if (i == num_fragm - 2)
520 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
521 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
522 copylen = left > per_fragm ? per_fragm : left;
523 memcpy(skb_put(frag, copylen), pos, copylen);
524
525 pos += copylen;
526 left -= copylen;
527 }
528 skb_trim(first, hdrlen + per_fragm);
529
530 tx->u.tx.num_extra_frag = num_fragm - 1;
531 tx->u.tx.extra_frag = frags;
532
533 return TXRX_CONTINUE;
534
535 fail:
536 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
537 if (frags) {
538 for (i = 0; i < num_fragm - 1; i++)
539 if (frags[i])
540 dev_kfree_skb(frags[i]);
541 kfree(frags);
542 }
543 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
544 return TXRX_DROP;
545 }
546
547 static ieee80211_txrx_result
548 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
549 {
550 if (!tx->key)
551 return TXRX_CONTINUE;
552
553 switch (tx->key->conf.alg) {
554 case ALG_WEP:
555 return ieee80211_crypto_wep_encrypt(tx);
556 case ALG_TKIP:
557 return ieee80211_crypto_tkip_encrypt(tx);
558 case ALG_CCMP:
559 return ieee80211_crypto_ccmp_encrypt(tx);
560 }
561
562 /* not reached */
563 WARN_ON(1);
564 return TXRX_DROP;
565 }
566
567 static ieee80211_txrx_result
568 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
569 {
570 struct rate_control_extra extra;
571
572 if (likely(!tx->u.tx.rate)) {
573 memset(&extra, 0, sizeof(extra));
574 extra.mode = tx->u.tx.mode;
575 extra.ethertype = tx->ethertype;
576
577 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev,
578 tx->skb, &extra);
579 if (unlikely(extra.probe != NULL)) {
580 tx->u.tx.control->flags |=
581 IEEE80211_TXCTL_RATE_CTRL_PROBE;
582 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
583 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
584 tx->u.tx.rate = extra.probe;
585 } else
586 tx->u.tx.control->alt_retry_rate = -1;
587
588 if (!tx->u.tx.rate)
589 return TXRX_DROP;
590 } else
591 tx->u.tx.control->alt_retry_rate = -1;
592
593 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
594 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
595 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
596 tx->u.tx.last_frag_rate = tx->u.tx.rate;
597 if (extra.probe)
598 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
599 else
600 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
601 tx->u.tx.rate = extra.nonerp;
602 tx->u.tx.control->rate = extra.nonerp;
603 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
604 } else {
605 tx->u.tx.last_frag_rate = tx->u.tx.rate;
606 tx->u.tx.control->rate = tx->u.tx.rate;
607 }
608 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
609
610 return TXRX_CONTINUE;
611 }
612
613 static ieee80211_txrx_result
614 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
615 {
616 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
617 u16 fc = le16_to_cpu(hdr->frame_control);
618 u16 dur;
619 struct ieee80211_tx_control *control = tx->u.tx.control;
620 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
621
622 if (!control->retry_limit) {
623 if (!is_multicast_ether_addr(hdr->addr1)) {
624 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
625 && tx->local->rts_threshold <
626 IEEE80211_MAX_RTS_THRESHOLD) {
627 control->flags |=
628 IEEE80211_TXCTL_USE_RTS_CTS;
629 control->flags |=
630 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
631 control->retry_limit =
632 tx->local->long_retry_limit;
633 } else {
634 control->retry_limit =
635 tx->local->short_retry_limit;
636 }
637 } else {
638 control->retry_limit = 1;
639 }
640 }
641
642 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
643 /* Do not use multiple retry rates when sending fragmented
644 * frames.
645 * TODO: The last fragment could still use multiple retry
646 * rates. */
647 control->alt_retry_rate = -1;
648 }
649
650 /* Use CTS protection for unicast frames sent using extended rates if
651 * there are associated non-ERP stations and RTS/CTS is not configured
652 * for the frame. */
653 if (mode->mode == MODE_IEEE80211G &&
654 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
655 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
656 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
657 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
658 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
659
660 /* Transmit data frames using short preambles if the driver supports
661 * short preambles at the selected rate and short preambles are
662 * available on the network at the current point in time. */
663 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
664 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
665 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
666 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
667 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
668 }
669
670 /* Setup duration field for the first fragment of the frame. Duration
671 * for remaining fragments will be updated when they are being sent
672 * to low-level driver in ieee80211_tx(). */
673 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
674 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
675 tx->u.tx.extra_frag[0]->len : 0);
676 hdr->duration_id = cpu_to_le16(dur);
677
678 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
679 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
680 struct ieee80211_rate *rate;
681
682 /* Do not use multiple retry rates when using RTS/CTS */
683 control->alt_retry_rate = -1;
684
685 /* Use min(data rate, max base rate) as CTS/RTS rate */
686 rate = tx->u.tx.rate;
687 while (rate > mode->rates &&
688 !(rate->flags & IEEE80211_RATE_BASIC))
689 rate--;
690
691 control->rts_cts_rate = rate->val;
692 control->rts_rate = rate;
693 }
694
695 if (tx->sta) {
696 tx->sta->tx_packets++;
697 tx->sta->tx_fragments++;
698 tx->sta->tx_bytes += tx->skb->len;
699 if (tx->u.tx.extra_frag) {
700 int i;
701 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
702 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
703 tx->sta->tx_bytes +=
704 tx->u.tx.extra_frag[i]->len;
705 }
706 }
707 }
708
709 /*
710 * Tell hardware to not encrypt when we had sw crypto.
711 * Because we use the same flag to internally indicate that
712 * no (software) encryption should be done, we have to set it
713 * after all crypto handlers.
714 */
715 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
716 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
717
718 return TXRX_CONTINUE;
719 }
720
721 static ieee80211_txrx_result
722 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
723 {
724 struct ieee80211_local *local = tx->local;
725 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
726 struct sk_buff *skb = tx->skb;
727 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
728 u32 load = 0, hdrtime;
729
730 /* TODO: this could be part of tx_status handling, so that the number
731 * of retries would be known; TX rate should in that case be stored
732 * somewhere with the packet */
733
734 /* Estimate total channel use caused by this frame */
735
736 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
737 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
738
739 if (mode->mode == MODE_IEEE80211A ||
740 (mode->mode == MODE_IEEE80211G &&
741 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
742 hdrtime = CHAN_UTIL_HDR_SHORT;
743 else
744 hdrtime = CHAN_UTIL_HDR_LONG;
745
746 load = hdrtime;
747 if (!is_multicast_ether_addr(hdr->addr1))
748 load += hdrtime;
749
750 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
751 load += 2 * hdrtime;
752 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
753 load += hdrtime;
754
755 load += skb->len * tx->u.tx.rate->rate_inv;
756
757 if (tx->u.tx.extra_frag) {
758 int i;
759 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
760 load += 2 * hdrtime;
761 load += tx->u.tx.extra_frag[i]->len *
762 tx->u.tx.rate->rate;
763 }
764 }
765
766 /* Divide channel_use by 8 to avoid wrapping around the counter */
767 load >>= CHAN_UTIL_SHIFT;
768 local->channel_use_raw += load;
769 if (tx->sta)
770 tx->sta->channel_use_raw += load;
771 tx->sdata->channel_use_raw += load;
772
773 return TXRX_CONTINUE;
774 }
775
776 /* TODO: implement register/unregister functions for adding TX/RX handlers
777 * into ordered list */
778
779 ieee80211_tx_handler ieee80211_tx_handlers[] =
780 {
781 ieee80211_tx_h_check_assoc,
782 ieee80211_tx_h_sequence,
783 ieee80211_tx_h_ps_buf,
784 ieee80211_tx_h_select_key,
785 ieee80211_tx_h_michael_mic_add,
786 ieee80211_tx_h_fragment,
787 ieee80211_tx_h_encrypt,
788 ieee80211_tx_h_rate_ctrl,
789 ieee80211_tx_h_misc,
790 ieee80211_tx_h_load_stats,
791 NULL
792 };
793
794 /* actual transmit path */
795
796 /*
797 * deal with packet injection down monitor interface
798 * with Radiotap Header -- only called for monitor mode interface
799 */
800 static ieee80211_txrx_result
801 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
802 struct sk_buff *skb)
803 {
804 /*
805 * this is the moment to interpret and discard the radiotap header that
806 * must be at the start of the packet injected in Monitor mode
807 *
808 * Need to take some care with endian-ness since radiotap
809 * args are little-endian
810 */
811
812 struct ieee80211_radiotap_iterator iterator;
813 struct ieee80211_radiotap_header *rthdr =
814 (struct ieee80211_radiotap_header *) skb->data;
815 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
816 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
817 struct ieee80211_tx_control *control = tx->u.tx.control;
818
819 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
820 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
821 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
822
823 /*
824 * for every radiotap entry that is present
825 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
826 * entries present, or -EINVAL on error)
827 */
828
829 while (!ret) {
830 int i, target_rate;
831
832 ret = ieee80211_radiotap_iterator_next(&iterator);
833
834 if (ret)
835 continue;
836
837 /* see if this argument is something we can use */
838 switch (iterator.this_arg_index) {
839 /*
840 * You must take care when dereferencing iterator.this_arg
841 * for multibyte types... the pointer is not aligned. Use
842 * get_unaligned((type *)iterator.this_arg) to dereference
843 * iterator.this_arg for type "type" safely on all arches.
844 */
845 case IEEE80211_RADIOTAP_RATE:
846 /*
847 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
848 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
849 */
850 target_rate = (*iterator.this_arg) * 5;
851 for (i = 0; i < mode->num_rates; i++) {
852 struct ieee80211_rate *r = &mode->rates[i];
853
854 if (r->rate == target_rate) {
855 tx->u.tx.rate = r;
856 break;
857 }
858 }
859 break;
860
861 case IEEE80211_RADIOTAP_ANTENNA:
862 /*
863 * radiotap uses 0 for 1st ant, mac80211 is 1 for
864 * 1st ant
865 */
866 control->antenna_sel_tx = (*iterator.this_arg) + 1;
867 break;
868
869 case IEEE80211_RADIOTAP_DBM_TX_POWER:
870 control->power_level = *iterator.this_arg;
871 break;
872
873 case IEEE80211_RADIOTAP_FLAGS:
874 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
875 /*
876 * this indicates that the skb we have been
877 * handed has the 32-bit FCS CRC at the end...
878 * we should react to that by snipping it off
879 * because it will be recomputed and added
880 * on transmission
881 */
882 if (skb->len < (iterator.max_length + FCS_LEN))
883 return TXRX_DROP;
884
885 skb_trim(skb, skb->len - FCS_LEN);
886 }
887 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
888 control->flags &=
889 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
890 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
891 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
892 break;
893
894 /*
895 * Please update the file
896 * Documentation/networking/mac80211-injection.txt
897 * when parsing new fields here.
898 */
899
900 default:
901 break;
902 }
903 }
904
905 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
906 return TXRX_DROP;
907
908 /*
909 * remove the radiotap header
910 * iterator->max_length was sanity-checked against
911 * skb->len by iterator init
912 */
913 skb_pull(skb, iterator.max_length);
914
915 return TXRX_CONTINUE;
916 }
917
918 /*
919 * initialises @tx
920 */
921 static ieee80211_txrx_result
922 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
923 struct sk_buff *skb,
924 struct net_device *dev,
925 struct ieee80211_tx_control *control)
926 {
927 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
928 struct ieee80211_hdr *hdr;
929 struct ieee80211_sub_if_data *sdata;
930 ieee80211_txrx_result res = TXRX_CONTINUE;
931
932 int hdrlen;
933
934 memset(tx, 0, sizeof(*tx));
935 tx->skb = skb;
936 tx->dev = dev; /* use original interface */
937 tx->local = local;
938 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
939 tx->u.tx.control = control;
940 /*
941 * Set this flag (used below to indicate "automatic fragmentation"),
942 * it will be cleared/left by radiotap as desired.
943 */
944 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
945
946 /* process and remove the injection radiotap header */
947 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
948 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
949 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
950 return TXRX_DROP;
951
952 /*
953 * __ieee80211_parse_tx_radiotap has now removed
954 * the radiotap header that was present and pre-filled
955 * 'tx' with tx control information.
956 */
957 }
958
959 hdr = (struct ieee80211_hdr *) skb->data;
960
961 tx->sta = sta_info_get(local, hdr->addr1);
962 tx->fc = le16_to_cpu(hdr->frame_control);
963
964 if (is_multicast_ether_addr(hdr->addr1)) {
965 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
966 control->flags |= IEEE80211_TXCTL_NO_ACK;
967 } else {
968 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
969 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
970 }
971
972 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
973 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
974 skb->len + FCS_LEN > local->fragmentation_threshold &&
975 !local->ops->set_frag_threshold)
976 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
977 else
978 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
979 }
980
981 if (!tx->sta)
982 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
983 else if (tx->sta->clear_dst_mask) {
984 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
985 tx->sta->clear_dst_mask = 0;
986 }
987
988 hdrlen = ieee80211_get_hdrlen(tx->fc);
989 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
990 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
991 tx->ethertype = (pos[0] << 8) | pos[1];
992 }
993 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
994
995 return res;
996 }
997
998 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
999 * finished with it.
1000 *
1001 * NB: @tx is uninitialised when passed in here
1002 */
1003 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1004 struct sk_buff *skb,
1005 struct net_device *mdev,
1006 struct ieee80211_tx_control *control)
1007 {
1008 struct ieee80211_tx_packet_data *pkt_data;
1009 struct net_device *dev;
1010
1011 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1012 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1013 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1014 dev_put(dev);
1015 dev = NULL;
1016 }
1017 if (unlikely(!dev))
1018 return -ENODEV;
1019 /* initialises tx with control */
1020 __ieee80211_tx_prepare(tx, skb, dev, control);
1021 return 0;
1022 }
1023
1024 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1025 struct ieee80211_txrx_data *tx)
1026 {
1027 struct ieee80211_tx_control *control = tx->u.tx.control;
1028 int ret, i;
1029
1030 if (!ieee80211_qdisc_installed(local->mdev) &&
1031 __ieee80211_queue_stopped(local, 0)) {
1032 netif_stop_queue(local->mdev);
1033 return IEEE80211_TX_AGAIN;
1034 }
1035 if (skb) {
1036 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1037 "TX to low-level driver", skb);
1038 ret = local->ops->tx(local_to_hw(local), skb, control);
1039 if (ret)
1040 return IEEE80211_TX_AGAIN;
1041 local->mdev->trans_start = jiffies;
1042 ieee80211_led_tx(local, 1);
1043 }
1044 if (tx->u.tx.extra_frag) {
1045 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1046 IEEE80211_TXCTL_USE_CTS_PROTECT |
1047 IEEE80211_TXCTL_CLEAR_DST_MASK |
1048 IEEE80211_TXCTL_FIRST_FRAGMENT);
1049 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1050 if (!tx->u.tx.extra_frag[i])
1051 continue;
1052 if (__ieee80211_queue_stopped(local, control->queue))
1053 return IEEE80211_TX_FRAG_AGAIN;
1054 if (i == tx->u.tx.num_extra_frag) {
1055 control->tx_rate = tx->u.tx.last_frag_hwrate;
1056 control->rate = tx->u.tx.last_frag_rate;
1057 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1058 control->flags |=
1059 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1060 else
1061 control->flags &=
1062 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1063 }
1064
1065 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1066 "TX to low-level driver",
1067 tx->u.tx.extra_frag[i]);
1068 ret = local->ops->tx(local_to_hw(local),
1069 tx->u.tx.extra_frag[i],
1070 control);
1071 if (ret)
1072 return IEEE80211_TX_FRAG_AGAIN;
1073 local->mdev->trans_start = jiffies;
1074 ieee80211_led_tx(local, 1);
1075 tx->u.tx.extra_frag[i] = NULL;
1076 }
1077 kfree(tx->u.tx.extra_frag);
1078 tx->u.tx.extra_frag = NULL;
1079 }
1080 return IEEE80211_TX_OK;
1081 }
1082
1083 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1084 struct ieee80211_tx_control *control)
1085 {
1086 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1087 struct sta_info *sta;
1088 ieee80211_tx_handler *handler;
1089 struct ieee80211_txrx_data tx;
1090 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1091 int ret, i;
1092
1093 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1094
1095 if (unlikely(skb->len < 10)) {
1096 dev_kfree_skb(skb);
1097 return 0;
1098 }
1099
1100 /* initialises tx */
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 /*
1109 * key references are protected using RCU and this requires that
1110 * we are in a read-site RCU section during receive processing
1111 */
1112 rcu_read_lock();
1113
1114 sta = tx.sta;
1115 tx.u.tx.mode = local->hw.conf.mode;
1116
1117 for (handler = local->tx_handlers; *handler != NULL;
1118 handler++) {
1119 res = (*handler)(&tx);
1120 if (res != TXRX_CONTINUE)
1121 break;
1122 }
1123
1124 skb = tx.skb; /* handlers are allowed to change skb */
1125
1126 if (sta)
1127 sta_info_put(sta);
1128
1129 if (unlikely(res == TXRX_DROP)) {
1130 I802_DEBUG_INC(local->tx_handlers_drop);
1131 goto drop;
1132 }
1133
1134 if (unlikely(res == TXRX_QUEUED)) {
1135 I802_DEBUG_INC(local->tx_handlers_queued);
1136 rcu_read_unlock();
1137 return 0;
1138 }
1139
1140 if (tx.u.tx.extra_frag) {
1141 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1142 int next_len, dur;
1143 struct ieee80211_hdr *hdr =
1144 (struct ieee80211_hdr *)
1145 tx.u.tx.extra_frag[i]->data;
1146
1147 if (i + 1 < tx.u.tx.num_extra_frag) {
1148 next_len = tx.u.tx.extra_frag[i + 1]->len;
1149 } else {
1150 next_len = 0;
1151 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1152 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1153 }
1154 dur = ieee80211_duration(&tx, 0, next_len);
1155 hdr->duration_id = cpu_to_le16(dur);
1156 }
1157 }
1158
1159 retry:
1160 ret = __ieee80211_tx(local, skb, &tx);
1161 if (ret) {
1162 struct ieee80211_tx_stored_packet *store =
1163 &local->pending_packet[control->queue];
1164
1165 if (ret == IEEE80211_TX_FRAG_AGAIN)
1166 skb = NULL;
1167 set_bit(IEEE80211_LINK_STATE_PENDING,
1168 &local->state[control->queue]);
1169 smp_mb();
1170 /* When the driver gets out of buffers during sending of
1171 * fragments and calls ieee80211_stop_queue, there is
1172 * a small window between IEEE80211_LINK_STATE_XOFF and
1173 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1174 * gets available in that window (i.e. driver calls
1175 * ieee80211_wake_queue), we would end up with ieee80211_tx
1176 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1177 * continuing transmitting here when that situation is
1178 * possible to have happened. */
1179 if (!__ieee80211_queue_stopped(local, control->queue)) {
1180 clear_bit(IEEE80211_LINK_STATE_PENDING,
1181 &local->state[control->queue]);
1182 goto retry;
1183 }
1184 memcpy(&store->control, control,
1185 sizeof(struct ieee80211_tx_control));
1186 store->skb = skb;
1187 store->extra_frag = tx.u.tx.extra_frag;
1188 store->num_extra_frag = tx.u.tx.num_extra_frag;
1189 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1190 store->last_frag_rate = tx.u.tx.last_frag_rate;
1191 store->last_frag_rate_ctrl_probe =
1192 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1193 }
1194 rcu_read_unlock();
1195 return 0;
1196
1197 drop:
1198 if (skb)
1199 dev_kfree_skb(skb);
1200 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1201 if (tx.u.tx.extra_frag[i])
1202 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1203 kfree(tx.u.tx.extra_frag);
1204 rcu_read_unlock();
1205 return 0;
1206 }
1207
1208 /* device xmit handlers */
1209
1210 int ieee80211_master_start_xmit(struct sk_buff *skb,
1211 struct net_device *dev)
1212 {
1213 struct ieee80211_tx_control control;
1214 struct ieee80211_tx_packet_data *pkt_data;
1215 struct net_device *odev = NULL;
1216 struct ieee80211_sub_if_data *osdata;
1217 int headroom;
1218 int ret;
1219
1220 /*
1221 * copy control out of the skb so other people can use skb->cb
1222 */
1223 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1224 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1225
1226 if (pkt_data->ifindex)
1227 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1228 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1229 dev_put(odev);
1230 odev = NULL;
1231 }
1232 if (unlikely(!odev)) {
1233 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1234 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1235 "originating device\n", dev->name);
1236 #endif
1237 dev_kfree_skb(skb);
1238 return 0;
1239 }
1240 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1241
1242 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1243 if (skb_headroom(skb) < headroom) {
1244 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1245 dev_kfree_skb(skb);
1246 dev_put(odev);
1247 return 0;
1248 }
1249 }
1250
1251 control.ifindex = odev->ifindex;
1252 control.type = osdata->type;
1253 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1254 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1255 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1256 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1257 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1258 control.flags |= IEEE80211_TXCTL_REQUEUE;
1259 control.queue = pkt_data->queue;
1260
1261 ret = ieee80211_tx(odev, skb, &control);
1262 dev_put(odev);
1263
1264 return ret;
1265 }
1266
1267 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1268 struct net_device *dev)
1269 {
1270 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1271 struct ieee80211_tx_packet_data *pkt_data;
1272 struct ieee80211_radiotap_header *prthdr =
1273 (struct ieee80211_radiotap_header *)skb->data;
1274 u16 len_rthdr;
1275
1276 /* check for not even having the fixed radiotap header part */
1277 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1278 goto fail; /* too short to be possibly valid */
1279
1280 /* is it a header version we can trust to find length from? */
1281 if (unlikely(prthdr->it_version))
1282 goto fail; /* only version 0 is supported */
1283
1284 /* then there must be a radiotap header with a length we can use */
1285 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1286
1287 /* does the skb contain enough to deliver on the alleged length? */
1288 if (unlikely(skb->len < len_rthdr))
1289 goto fail; /* skb too short for claimed rt header extent */
1290
1291 skb->dev = local->mdev;
1292
1293 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1294 memset(pkt_data, 0, sizeof(*pkt_data));
1295 /* needed because we set skb device to master */
1296 pkt_data->ifindex = dev->ifindex;
1297
1298 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1299
1300 /*
1301 * fix up the pointers accounting for the radiotap
1302 * header still being in there. We are being given
1303 * a precooked IEEE80211 header so no need for
1304 * normal processing
1305 */
1306 skb_set_mac_header(skb, len_rthdr);
1307 /*
1308 * these are just fixed to the end of the rt area since we
1309 * don't have any better information and at this point, nobody cares
1310 */
1311 skb_set_network_header(skb, len_rthdr);
1312 skb_set_transport_header(skb, len_rthdr);
1313
1314 /* pass the radiotap header up to the next stage intact */
1315 dev_queue_xmit(skb);
1316 return NETDEV_TX_OK;
1317
1318 fail:
1319 dev_kfree_skb(skb);
1320 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1321 }
1322
1323 /**
1324 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1325 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1326 * @skb: packet to be sent
1327 * @dev: incoming interface
1328 *
1329 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1330 * not be freed, and caller is responsible for either retrying later or freeing
1331 * skb).
1332 *
1333 * This function takes in an Ethernet header and encapsulates it with suitable
1334 * IEEE 802.11 header based on which interface the packet is coming in. The
1335 * encapsulated packet will then be passed to master interface, wlan#.11, for
1336 * transmission (through low-level driver).
1337 */
1338 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1339 struct net_device *dev)
1340 {
1341 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1342 struct ieee80211_tx_packet_data *pkt_data;
1343 struct ieee80211_sub_if_data *sdata;
1344 int ret = 1, head_need;
1345 u16 ethertype, hdrlen, fc;
1346 struct ieee80211_hdr hdr;
1347 const u8 *encaps_data;
1348 int encaps_len, skip_header_bytes;
1349 int nh_pos, h_pos;
1350 struct sta_info *sta;
1351
1352 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1353 if (unlikely(skb->len < ETH_HLEN)) {
1354 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1355 dev->name, skb->len);
1356 ret = 0;
1357 goto fail;
1358 }
1359
1360 nh_pos = skb_network_header(skb) - skb->data;
1361 h_pos = skb_transport_header(skb) - skb->data;
1362
1363 /* convert Ethernet header to proper 802.11 header (based on
1364 * operation mode) */
1365 ethertype = (skb->data[12] << 8) | skb->data[13];
1366 /* TODO: handling for 802.1x authorized/unauthorized port */
1367 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1368
1369 switch (sdata->type) {
1370 case IEEE80211_IF_TYPE_AP:
1371 case IEEE80211_IF_TYPE_VLAN:
1372 fc |= IEEE80211_FCTL_FROMDS;
1373 /* DA BSSID SA */
1374 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1375 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1376 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1377 hdrlen = 24;
1378 break;
1379 case IEEE80211_IF_TYPE_WDS:
1380 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1381 /* RA TA DA SA */
1382 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1383 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1384 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1385 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1386 hdrlen = 30;
1387 break;
1388 case IEEE80211_IF_TYPE_STA:
1389 fc |= IEEE80211_FCTL_TODS;
1390 /* BSSID SA DA */
1391 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1392 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1393 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1394 hdrlen = 24;
1395 break;
1396 case IEEE80211_IF_TYPE_IBSS:
1397 /* DA SA BSSID */
1398 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1399 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1400 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1401 hdrlen = 24;
1402 break;
1403 default:
1404 ret = 0;
1405 goto fail;
1406 }
1407
1408 /* receiver is QoS enabled, use a QoS type frame */
1409 sta = sta_info_get(local, hdr.addr1);
1410 if (sta) {
1411 if (sta->flags & WLAN_STA_WME) {
1412 fc |= IEEE80211_STYPE_QOS_DATA;
1413 hdrlen += 2;
1414 }
1415 sta_info_put(sta);
1416 }
1417
1418 hdr.frame_control = cpu_to_le16(fc);
1419 hdr.duration_id = 0;
1420 hdr.seq_ctrl = 0;
1421
1422 skip_header_bytes = ETH_HLEN;
1423 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1424 encaps_data = bridge_tunnel_header;
1425 encaps_len = sizeof(bridge_tunnel_header);
1426 skip_header_bytes -= 2;
1427 } else if (ethertype >= 0x600) {
1428 encaps_data = rfc1042_header;
1429 encaps_len = sizeof(rfc1042_header);
1430 skip_header_bytes -= 2;
1431 } else {
1432 encaps_data = NULL;
1433 encaps_len = 0;
1434 }
1435
1436 skb_pull(skb, skip_header_bytes);
1437 nh_pos -= skip_header_bytes;
1438 h_pos -= skip_header_bytes;
1439
1440 /* TODO: implement support for fragments so that there is no need to
1441 * reallocate and copy payload; it might be enough to support one
1442 * extra fragment that would be copied in the beginning of the frame
1443 * data.. anyway, it would be nice to include this into skb structure
1444 * somehow
1445 *
1446 * There are few options for this:
1447 * use skb->cb as an extra space for 802.11 header
1448 * allocate new buffer if not enough headroom
1449 * make sure that there is enough headroom in every skb by increasing
1450 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1451 * alloc_skb() (net/core/skbuff.c)
1452 */
1453 head_need = hdrlen + encaps_len + local->tx_headroom;
1454 head_need -= skb_headroom(skb);
1455
1456 /* We are going to modify skb data, so make a copy of it if happens to
1457 * be cloned. This could happen, e.g., with Linux bridge code passing
1458 * us broadcast frames. */
1459
1460 if (head_need > 0 || skb_cloned(skb)) {
1461 #if 0
1462 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1463 "of headroom\n", dev->name, head_need);
1464 #endif
1465
1466 if (skb_cloned(skb))
1467 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1468 else
1469 I802_DEBUG_INC(local->tx_expand_skb_head);
1470 /* Since we have to reallocate the buffer, make sure that there
1471 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1472 * before payload and 12 after). */
1473 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1474 12, GFP_ATOMIC)) {
1475 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1476 "\n", dev->name);
1477 goto fail;
1478 }
1479 }
1480
1481 if (encaps_data) {
1482 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1483 nh_pos += encaps_len;
1484 h_pos += encaps_len;
1485 }
1486
1487 if (fc & IEEE80211_STYPE_QOS_DATA) {
1488 __le16 *qos_control;
1489
1490 qos_control = (__le16*) skb_push(skb, 2);
1491 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1492 /*
1493 * Maybe we could actually set some fields here, for now just
1494 * initialise to zero to indicate no special operation.
1495 */
1496 *qos_control = 0;
1497 } else
1498 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1499
1500 nh_pos += hdrlen;
1501 h_pos += hdrlen;
1502
1503 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1504 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1505 pkt_data->ifindex = dev->ifindex;
1506
1507 skb->dev = local->mdev;
1508 dev->stats.tx_packets++;
1509 dev->stats.tx_bytes += skb->len;
1510
1511 /* Update skb pointers to various headers since this modified frame
1512 * is going to go through Linux networking code that may potentially
1513 * need things like pointer to IP header. */
1514 skb_set_mac_header(skb, 0);
1515 skb_set_network_header(skb, nh_pos);
1516 skb_set_transport_header(skb, h_pos);
1517
1518 dev->trans_start = jiffies;
1519 dev_queue_xmit(skb);
1520
1521 return 0;
1522
1523 fail:
1524 if (!ret)
1525 dev_kfree_skb(skb);
1526
1527 return ret;
1528 }
1529
1530 /*
1531 * This is the transmit routine for the 802.11 type interfaces
1532 * called by upper layers of the linux networking
1533 * stack when it has a frame to transmit
1534 */
1535 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1536 {
1537 struct ieee80211_sub_if_data *sdata;
1538 struct ieee80211_tx_packet_data *pkt_data;
1539 struct ieee80211_hdr *hdr;
1540 u16 fc;
1541
1542 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1543
1544 if (skb->len < 10) {
1545 dev_kfree_skb(skb);
1546 return 0;
1547 }
1548
1549 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1550 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1551 0, GFP_ATOMIC)) {
1552 dev_kfree_skb(skb);
1553 return 0;
1554 }
1555 }
1556
1557 hdr = (struct ieee80211_hdr *) skb->data;
1558 fc = le16_to_cpu(hdr->frame_control);
1559
1560 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1561 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1562 pkt_data->ifindex = sdata->dev->ifindex;
1563
1564 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1565 skb->dev = sdata->local->mdev;
1566
1567 /*
1568 * We're using the protocol field of the the frame control header
1569 * to request TX callback for hostapd. BIT(1) is checked.
1570 */
1571 if ((fc & BIT(1)) == BIT(1)) {
1572 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1573 fc &= ~BIT(1);
1574 hdr->frame_control = cpu_to_le16(fc);
1575 }
1576
1577 if (!(fc & IEEE80211_FCTL_PROTECTED))
1578 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1579
1580 dev->stats.tx_packets++;
1581 dev->stats.tx_bytes += skb->len;
1582
1583 dev_queue_xmit(skb);
1584
1585 return 0;
1586 }
1587
1588 /* helper functions for pending packets for when queues are stopped */
1589
1590 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1591 {
1592 int i, j;
1593 struct ieee80211_tx_stored_packet *store;
1594
1595 for (i = 0; i < local->hw.queues; i++) {
1596 if (!__ieee80211_queue_pending(local, i))
1597 continue;
1598 store = &local->pending_packet[i];
1599 kfree_skb(store->skb);
1600 for (j = 0; j < store->num_extra_frag; j++)
1601 kfree_skb(store->extra_frag[j]);
1602 kfree(store->extra_frag);
1603 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1604 }
1605 }
1606
1607 void ieee80211_tx_pending(unsigned long data)
1608 {
1609 struct ieee80211_local *local = (struct ieee80211_local *)data;
1610 struct net_device *dev = local->mdev;
1611 struct ieee80211_tx_stored_packet *store;
1612 struct ieee80211_txrx_data tx;
1613 int i, ret, reschedule = 0;
1614
1615 netif_tx_lock_bh(dev);
1616 for (i = 0; i < local->hw.queues; i++) {
1617 if (__ieee80211_queue_stopped(local, i))
1618 continue;
1619 if (!__ieee80211_queue_pending(local, i)) {
1620 reschedule = 1;
1621 continue;
1622 }
1623 store = &local->pending_packet[i];
1624 tx.u.tx.control = &store->control;
1625 tx.u.tx.extra_frag = store->extra_frag;
1626 tx.u.tx.num_extra_frag = store->num_extra_frag;
1627 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1628 tx.u.tx.last_frag_rate = store->last_frag_rate;
1629 tx.flags = 0;
1630 if (store->last_frag_rate_ctrl_probe)
1631 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1632 ret = __ieee80211_tx(local, store->skb, &tx);
1633 if (ret) {
1634 if (ret == IEEE80211_TX_FRAG_AGAIN)
1635 store->skb = NULL;
1636 } else {
1637 clear_bit(IEEE80211_LINK_STATE_PENDING,
1638 &local->state[i]);
1639 reschedule = 1;
1640 }
1641 }
1642 netif_tx_unlock_bh(dev);
1643 if (reschedule) {
1644 if (!ieee80211_qdisc_installed(dev)) {
1645 if (!__ieee80211_queue_stopped(local, 0))
1646 netif_wake_queue(dev);
1647 } else
1648 netif_schedule(dev);
1649 }
1650 }
1651
1652 /* functions for drivers to get certain frames */
1653
1654 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1655 struct ieee80211_if_ap *bss,
1656 struct sk_buff *skb)
1657 {
1658 u8 *pos, *tim;
1659 int aid0 = 0;
1660 int i, have_bits = 0, n1, n2;
1661
1662 /* Generate bitmap for TIM only if there are any STAs in power save
1663 * mode. */
1664 read_lock_bh(&local->sta_lock);
1665 if (atomic_read(&bss->num_sta_ps) > 0)
1666 /* in the hope that this is faster than
1667 * checking byte-for-byte */
1668 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1669 IEEE80211_MAX_AID+1);
1670
1671 if (bss->dtim_count == 0)
1672 bss->dtim_count = bss->dtim_period - 1;
1673 else
1674 bss->dtim_count--;
1675
1676 tim = pos = (u8 *) skb_put(skb, 6);
1677 *pos++ = WLAN_EID_TIM;
1678 *pos++ = 4;
1679 *pos++ = bss->dtim_count;
1680 *pos++ = bss->dtim_period;
1681
1682 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1683 aid0 = 1;
1684
1685 if (have_bits) {
1686 /* Find largest even number N1 so that bits numbered 1 through
1687 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1688 * (N2 + 1) x 8 through 2007 are 0. */
1689 n1 = 0;
1690 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1691 if (bss->tim[i]) {
1692 n1 = i & 0xfe;
1693 break;
1694 }
1695 }
1696 n2 = n1;
1697 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1698 if (bss->tim[i]) {
1699 n2 = i;
1700 break;
1701 }
1702 }
1703
1704 /* Bitmap control */
1705 *pos++ = n1 | aid0;
1706 /* Part Virt Bitmap */
1707 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1708
1709 tim[1] = n2 - n1 + 4;
1710 skb_put(skb, n2 - n1);
1711 } else {
1712 *pos++ = aid0; /* Bitmap control */
1713 *pos++ = 0; /* Part Virt Bitmap */
1714 }
1715 read_unlock_bh(&local->sta_lock);
1716 }
1717
1718 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1719 struct ieee80211_tx_control *control)
1720 {
1721 struct ieee80211_local *local = hw_to_local(hw);
1722 struct sk_buff *skb;
1723 struct net_device *bdev;
1724 struct ieee80211_sub_if_data *sdata = NULL;
1725 struct ieee80211_if_ap *ap = NULL;
1726 struct ieee80211_rate *rate;
1727 struct rate_control_extra extra;
1728 u8 *b_head, *b_tail;
1729 int bh_len, bt_len;
1730
1731 bdev = dev_get_by_index(&init_net, if_id);
1732 if (bdev) {
1733 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1734 ap = &sdata->u.ap;
1735 dev_put(bdev);
1736 }
1737
1738 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1739 !ap->beacon_head) {
1740 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1741 if (net_ratelimit())
1742 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1743 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1744 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1745 return NULL;
1746 }
1747
1748 /* Assume we are generating the normal beacon locally */
1749 b_head = ap->beacon_head;
1750 b_tail = ap->beacon_tail;
1751 bh_len = ap->beacon_head_len;
1752 bt_len = ap->beacon_tail_len;
1753
1754 skb = dev_alloc_skb(local->tx_headroom +
1755 bh_len + bt_len + 256 /* maximum TIM len */);
1756 if (!skb)
1757 return NULL;
1758
1759 skb_reserve(skb, local->tx_headroom);
1760 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1761
1762 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1763
1764 ieee80211_beacon_add_tim(local, ap, skb);
1765
1766 if (b_tail) {
1767 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1768 }
1769
1770 if (control) {
1771 memset(&extra, 0, sizeof(extra));
1772 extra.mode = local->oper_hw_mode;
1773
1774 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1775 if (!rate) {
1776 if (net_ratelimit()) {
1777 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1778 "found\n", wiphy_name(local->hw.wiphy));
1779 }
1780 dev_kfree_skb(skb);
1781 return NULL;
1782 }
1783
1784 control->tx_rate =
1785 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1786 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1787 rate->val2 : rate->val;
1788 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1789 control->power_level = local->hw.conf.power_level;
1790 control->flags |= IEEE80211_TXCTL_NO_ACK;
1791 control->retry_limit = 1;
1792 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1793 }
1794
1795 ap->num_beacons++;
1796 return skb;
1797 }
1798 EXPORT_SYMBOL(ieee80211_beacon_get);
1799
1800 void ieee80211_rts_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_rts *rts)
1804 {
1805 const struct ieee80211_hdr *hdr = frame;
1806 u16 fctl;
1807
1808 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1809 rts->frame_control = cpu_to_le16(fctl);
1810 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1811 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1812 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1813 }
1814 EXPORT_SYMBOL(ieee80211_rts_get);
1815
1816 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1817 const void *frame, size_t frame_len,
1818 const struct ieee80211_tx_control *frame_txctl,
1819 struct ieee80211_cts *cts)
1820 {
1821 const struct ieee80211_hdr *hdr = frame;
1822 u16 fctl;
1823
1824 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1825 cts->frame_control = cpu_to_le16(fctl);
1826 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1827 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1828 }
1829 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1830
1831 struct sk_buff *
1832 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1833 struct ieee80211_tx_control *control)
1834 {
1835 struct ieee80211_local *local = hw_to_local(hw);
1836 struct sk_buff *skb;
1837 struct sta_info *sta;
1838 ieee80211_tx_handler *handler;
1839 struct ieee80211_txrx_data tx;
1840 ieee80211_txrx_result res = TXRX_DROP;
1841 struct net_device *bdev;
1842 struct ieee80211_sub_if_data *sdata;
1843 struct ieee80211_if_ap *bss = NULL;
1844
1845 bdev = dev_get_by_index(&init_net, if_id);
1846 if (bdev) {
1847 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1848 bss = &sdata->u.ap;
1849 dev_put(bdev);
1850 }
1851 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1852 return NULL;
1853
1854 if (bss->dtim_count != 0)
1855 return NULL; /* send buffered bc/mc only after DTIM beacon */
1856 memset(control, 0, sizeof(*control));
1857 while (1) {
1858 skb = skb_dequeue(&bss->ps_bc_buf);
1859 if (!skb)
1860 return NULL;
1861 local->total_ps_buffered--;
1862
1863 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1864 struct ieee80211_hdr *hdr =
1865 (struct ieee80211_hdr *) skb->data;
1866 /* more buffered multicast/broadcast frames ==> set
1867 * MoreData flag in IEEE 802.11 header to inform PS
1868 * STAs */
1869 hdr->frame_control |=
1870 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1871 }
1872
1873 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1874 break;
1875 dev_kfree_skb_any(skb);
1876 }
1877 sta = tx.sta;
1878 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1879 tx.u.tx.mode = local->hw.conf.mode;
1880
1881 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1882 res = (*handler)(&tx);
1883 if (res == TXRX_DROP || res == TXRX_QUEUED)
1884 break;
1885 }
1886 dev_put(tx.dev);
1887 skb = tx.skb; /* handlers are allowed to change skb */
1888
1889 if (res == TXRX_DROP) {
1890 I802_DEBUG_INC(local->tx_handlers_drop);
1891 dev_kfree_skb(skb);
1892 skb = NULL;
1893 } else if (res == TXRX_QUEUED) {
1894 I802_DEBUG_INC(local->tx_handlers_queued);
1895 skb = NULL;
1896 }
1897
1898 if (sta)
1899 sta_info_put(sta);
1900
1901 return skb;
1902 }
1903 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
kernel-based virtual machine