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181d97015f614cb733f32bba8949af2a1be645c1
[openwrt.git] / package / mac80211 / src / net / mac80211 / tx.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <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_supported_band *sband;
96
97 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
98
99 erp = 0;
100 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
101 erp = txrate->flags & IEEE80211_RATE_ERP_G;
102
103 /*
104 * data and mgmt (except PS Poll):
105 * - during CFP: 32768
106 * - during contention period:
107 * if addr1 is group address: 0
108 * if more fragments = 0 and addr1 is individual address: time to
109 * transmit one ACK plus SIFS
110 * if more fragments = 1 and addr1 is individual address: time to
111 * transmit next fragment plus 2 x ACK plus 3 x SIFS
112 *
113 * IEEE 802.11, 9.6:
114 * - control response frame (CTS or ACK) shall be transmitted using the
115 * same rate as the immediately previous frame in the frame exchange
116 * sequence, if this rate belongs to the PHY mandatory rates, or else
117 * at the highest possible rate belonging to the PHY rates in the
118 * BSSBasicRateSet
119 */
120
121 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
122 /* TODO: These control frames are not currently sent by
123 * 80211.o, but should they be implemented, this function
124 * needs to be updated to support duration field calculation.
125 *
126 * RTS: time needed to transmit pending data/mgmt frame plus
127 * one CTS frame plus one ACK frame plus 3 x SIFS
128 * CTS: duration of immediately previous RTS minus time
129 * required to transmit CTS and its SIFS
130 * ACK: 0 if immediately previous directed data/mgmt had
131 * more=0, with more=1 duration in ACK frame is duration
132 * from previous frame minus time needed to transmit ACK
133 * and its SIFS
134 * PS Poll: BIT(15) | BIT(14) | aid
135 */
136 return 0;
137 }
138
139 /* data/mgmt */
140 if (0 /* FIX: data/mgmt during CFP */)
141 return 32768;
142
143 if (group_addr) /* Group address as the destination - no ACK */
144 return 0;
145
146 /* Individual destination address:
147 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
148 * CTS and ACK frames shall be transmitted using the highest rate in
149 * basic rate set that is less than or equal to the rate of the
150 * immediately previous frame and that is using the same modulation
151 * (CCK or OFDM). If no basic rate set matches with these requirements,
152 * the highest mandatory rate of the PHY that is less than or equal to
153 * the rate of the previous frame is used.
154 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
155 */
156 rate = -1;
157 /* use lowest available if everything fails */
158 mrate = sband->bitrates[0].bitrate;
159 for (i = 0; i < sband->n_bitrates; i++) {
160 struct ieee80211_rate *r = &sband->bitrates[i];
161
162 if (r->bitrate > txrate->bitrate)
163 break;
164
165 if (tx->sdata->basic_rates & BIT(i))
166 rate = r->bitrate;
167
168 switch (sband->band) {
169 case IEEE80211_BAND_2GHZ: {
170 u32 flag;
171 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
172 flag = IEEE80211_RATE_MANDATORY_G;
173 else
174 flag = IEEE80211_RATE_MANDATORY_B;
175 if (r->flags & flag)
176 mrate = r->bitrate;
177 break;
178 }
179 case IEEE80211_BAND_5GHZ:
180 if (r->flags & IEEE80211_RATE_MANDATORY_A)
181 mrate = r->bitrate;
182 break;
183 case IEEE80211_NUM_BANDS:
184 WARN_ON(1);
185 break;
186 }
187 }
188 if (rate == -1) {
189 /* No matching basic rate found; use highest suitable mandatory
190 * PHY rate */
191 rate = mrate;
192 }
193
194 /* Time needed to transmit ACK
195 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
196 * to closest integer */
197
198 dur = ieee80211_frame_duration(local, 10, rate, erp,
199 tx->sdata->bss_conf.use_short_preamble);
200
201 if (next_frag_len) {
202 /* Frame is fragmented: duration increases with time needed to
203 * transmit next fragment plus ACK and 2 x SIFS. */
204 dur *= 2; /* ACK + SIFS */
205 /* next fragment */
206 dur += ieee80211_frame_duration(local, next_frag_len,
207 txrate->bitrate, erp,
208 tx->sdata->bss_conf.use_short_preamble);
209 }
210
211 return dur;
212 }
213
214 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
215 int queue)
216 {
217 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
218 }
219
220 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
221 int queue)
222 {
223 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
224 }
225
226 static int inline is_ieee80211_device(struct net_device *dev,
227 struct net_device *master)
228 {
229 return (wdev_priv(dev->ieee80211_ptr) ==
230 wdev_priv(master->ieee80211_ptr));
231 }
232
233 /* tx handlers */
234
235 static ieee80211_tx_result
236 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
237 {
238 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 struct sk_buff *skb = tx->skb;
240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
241 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
242 u32 sta_flags;
243
244 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
245 return TX_CONTINUE;
246
247 if (unlikely(tx->local->sta_sw_scanning) &&
248 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
249 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
250 return TX_DROP;
251
252 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
253 return TX_CONTINUE;
254
255 sta_flags = tx->sta ? tx->sta->flags : 0;
256
257 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
258 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
259 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
260 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 DECLARE_MAC_BUF(mac);
263 printk(KERN_DEBUG "%s: dropped data frame to not "
264 "associated station %s\n",
265 tx->dev->name, print_mac(mac, hdr->addr1));
266 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
267 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
268 return TX_DROP;
269 }
270 } else {
271 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
272 tx->local->num_sta == 0 &&
273 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
274 /*
275 * No associated STAs - no need to send multicast
276 * frames.
277 */
278 return TX_DROP;
279 }
280 return TX_CONTINUE;
281 }
282
283 return TX_CONTINUE;
284 }
285
286 static ieee80211_tx_result
287 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
288 {
289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
290
291 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
292 ieee80211_include_sequence(tx->sdata, hdr);
293
294 return TX_CONTINUE;
295 }
296
297 /* This function is called whenever the AP is about to exceed the maximum limit
298 * of buffered frames for power saving STAs. This situation should not really
299 * happen often during normal operation, so dropping the oldest buffered packet
300 * from each queue should be OK to make some room for new frames. */
301 static void purge_old_ps_buffers(struct ieee80211_local *local)
302 {
303 int total = 0, purged = 0;
304 struct sk_buff *skb;
305 struct ieee80211_sub_if_data *sdata;
306 struct sta_info *sta;
307
308 /*
309 * virtual interfaces are protected by RCU
310 */
311 rcu_read_lock();
312
313 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
314 struct ieee80211_if_ap *ap;
315 if (sdata->dev == local->mdev ||
316 sdata->vif.type != IEEE80211_IF_TYPE_AP)
317 continue;
318 ap = &sdata->u.ap;
319 skb = skb_dequeue(&ap->ps_bc_buf);
320 if (skb) {
321 purged++;
322 dev_kfree_skb(skb);
323 }
324 total += skb_queue_len(&ap->ps_bc_buf);
325 }
326 rcu_read_unlock();
327
328 read_lock_bh(&local->sta_lock);
329 list_for_each_entry(sta, &local->sta_list, list) {
330 skb = skb_dequeue(&sta->ps_tx_buf);
331 if (skb) {
332 purged++;
333 dev_kfree_skb(skb);
334 }
335 total += skb_queue_len(&sta->ps_tx_buf);
336 }
337 read_unlock_bh(&local->sta_lock);
338
339 local->total_ps_buffered = total;
340 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
341 wiphy_name(local->hw.wiphy), purged);
342 }
343
344 static ieee80211_tx_result
345 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
346 {
347 /*
348 * broadcast/multicast frame
349 *
350 * If any of the associated stations is in power save mode,
351 * the frame is buffered to be sent after DTIM beacon frame.
352 * This is done either by the hardware or us.
353 */
354
355 /* not AP/IBSS or ordered frame */
356 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
357 return TX_CONTINUE;
358
359 /* no stations in PS mode */
360 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
361 return TX_CONTINUE;
362
363 /* buffered in mac80211 */
364 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
365 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
366 purge_old_ps_buffers(tx->local);
367 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
368 AP_MAX_BC_BUFFER) {
369 if (net_ratelimit()) {
370 printk(KERN_DEBUG "%s: BC TX buffer full - "
371 "dropping the oldest frame\n",
372 tx->dev->name);
373 }
374 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
375 } else
376 tx->local->total_ps_buffered++;
377 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
378 return TX_QUEUED;
379 }
380
381 /* buffered in hardware */
382 tx->u.tx.control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM;
383
384 return TX_CONTINUE;
385 }
386
387 static ieee80211_tx_result
388 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
389 {
390 struct sta_info *sta = tx->sta;
391 DECLARE_MAC_BUF(mac);
392
393 if (unlikely(!sta ||
394 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
395 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
396 return TX_CONTINUE;
397
398 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
399 struct ieee80211_tx_packet_data *pkt_data;
400 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
402 "before %d)\n",
403 print_mac(mac, sta->addr), sta->aid,
404 skb_queue_len(&sta->ps_tx_buf));
405 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
406 sta->flags |= WLAN_STA_TIM;
407 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
408 purge_old_ps_buffers(tx->local);
409 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
410 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
411 if (net_ratelimit()) {
412 printk(KERN_DEBUG "%s: STA %s TX "
413 "buffer full - dropping oldest frame\n",
414 tx->dev->name, print_mac(mac, sta->addr));
415 }
416 dev_kfree_skb(old);
417 } else
418 tx->local->total_ps_buffered++;
419 /* Queue frame to be sent after STA sends an PS Poll frame */
420 if (skb_queue_empty(&sta->ps_tx_buf)) {
421 if (tx->local->ops->set_tim)
422 tx->local->ops->set_tim(local_to_hw(tx->local),
423 sta->aid, 1);
424 if (tx->sdata->bss)
425 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
426 }
427 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
428 pkt_data->jiffies = jiffies;
429 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
430 return TX_QUEUED;
431 }
432 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
433 else if (unlikely(sta->flags & WLAN_STA_PS)) {
434 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
435 "set -> send frame\n", tx->dev->name,
436 print_mac(mac, sta->addr));
437 }
438 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
439 sta->pspoll = 0;
440
441 return TX_CONTINUE;
442 }
443
444 static ieee80211_tx_result
445 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
446 {
447 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
448 return TX_CONTINUE;
449
450 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
451 return ieee80211_tx_h_unicast_ps_buf(tx);
452 else
453 return ieee80211_tx_h_multicast_ps_buf(tx);
454 }
455
456 static ieee80211_tx_result
457 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
458 {
459 struct ieee80211_key *key;
460 u16 fc = tx->fc;
461
462 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
463 tx->key = NULL;
464 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
465 tx->key = key;
466 else if ((key = rcu_dereference(tx->sdata->default_key)))
467 tx->key = key;
468 else if (tx->sdata->drop_unencrypted &&
469 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
470 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
471 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
472 return TX_DROP;
473 } else
474 tx->key = NULL;
475
476 if (tx->key) {
477 u16 ftype, stype;
478
479 tx->key->tx_rx_count++;
480 /* TODO: add threshold stuff again */
481
482 switch (tx->key->conf.alg) {
483 case ALG_WEP:
484 ftype = fc & IEEE80211_FCTL_FTYPE;
485 stype = fc & IEEE80211_FCTL_STYPE;
486
487 if (ftype == IEEE80211_FTYPE_MGMT &&
488 stype == IEEE80211_STYPE_AUTH)
489 break;
490 case ALG_TKIP:
491 case ALG_CCMP:
492 if (!WLAN_FC_DATA_PRESENT(fc))
493 tx->key = NULL;
494 break;
495 }
496 }
497
498 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
499 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
500
501 return TX_CONTINUE;
502 }
503
504 static ieee80211_tx_result
505 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
506 {
507 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
508 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
509 struct sk_buff **frags, *first, *frag;
510 int i;
511 u16 seq;
512 u8 *pos;
513 int frag_threshold = tx->local->fragmentation_threshold;
514
515 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
516 return TX_CONTINUE;
517
518 first = tx->skb;
519
520 hdrlen = ieee80211_get_hdrlen(tx->fc);
521 payload_len = first->len - hdrlen;
522 per_fragm = frag_threshold - hdrlen - FCS_LEN;
523 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
524
525 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
526 if (!frags)
527 goto fail;
528
529 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
530 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
531 pos = first->data + hdrlen + per_fragm;
532 left = payload_len - per_fragm;
533 for (i = 0; i < num_fragm - 1; i++) {
534 struct ieee80211_hdr *fhdr;
535 size_t copylen;
536
537 if (left <= 0)
538 goto fail;
539
540 /* reserve enough extra head and tail room for possible
541 * encryption */
542 frag = frags[i] =
543 dev_alloc_skb(tx->local->tx_headroom +
544 frag_threshold +
545 IEEE80211_ENCRYPT_HEADROOM +
546 IEEE80211_ENCRYPT_TAILROOM);
547 if (!frag)
548 goto fail;
549 /* Make sure that all fragments use the same priority so
550 * that they end up using the same TX queue */
551 frag->priority = first->priority;
552 skb_reserve(frag, tx->local->tx_headroom +
553 IEEE80211_ENCRYPT_HEADROOM);
554 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
555 memcpy(fhdr, first->data, hdrlen);
556 if (i == num_fragm - 2)
557 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
558 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
559 copylen = left > per_fragm ? per_fragm : left;
560 memcpy(skb_put(frag, copylen), pos, copylen);
561
562 pos += copylen;
563 left -= copylen;
564 }
565 skb_trim(first, hdrlen + per_fragm);
566
567 tx->u.tx.num_extra_frag = num_fragm - 1;
568 tx->u.tx.extra_frag = frags;
569
570 return TX_CONTINUE;
571
572 fail:
573 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
574 if (frags) {
575 for (i = 0; i < num_fragm - 1; i++)
576 if (frags[i])
577 dev_kfree_skb(frags[i]);
578 kfree(frags);
579 }
580 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
581 return TX_DROP;
582 }
583
584 static ieee80211_tx_result
585 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
586 {
587 if (!tx->key)
588 return TX_CONTINUE;
589
590 switch (tx->key->conf.alg) {
591 case ALG_WEP:
592 return ieee80211_crypto_wep_encrypt(tx);
593 case ALG_TKIP:
594 return ieee80211_crypto_tkip_encrypt(tx);
595 case ALG_CCMP:
596 return ieee80211_crypto_ccmp_encrypt(tx);
597 }
598
599 /* not reached */
600 WARN_ON(1);
601 return TX_DROP;
602 }
603
604 static ieee80211_tx_result
605 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
606 {
607 struct rate_selection rsel;
608 struct ieee80211_supported_band *sband;
609
610 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
611
612 if (likely(!tx->u.tx.rate)) {
613 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
614 tx->u.tx.rate = rsel.rate;
615 if (unlikely(rsel.probe)) {
616 tx->u.tx.control->flags |=
617 IEEE80211_TXCTL_RATE_CTRL_PROBE;
618 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
619 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate;
620 tx->u.tx.rate = rsel.probe;
621 } else
622 tx->u.tx.control->alt_retry_rate = NULL;
623
624 if (!tx->u.tx.rate)
625 return TX_DROP;
626 } else
627 tx->u.tx.control->alt_retry_rate = NULL;
628
629 if (tx->sdata->bss_conf.use_cts_prot &&
630 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
631 tx->u.tx.last_frag_rate = tx->u.tx.rate;
632 if (rsel.probe)
633 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
634 else
635 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
636 tx->u.tx.rate = rsel.nonerp;
637 tx->u.tx.control->tx_rate = rsel.nonerp;
638 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
639 } else {
640 tx->u.tx.last_frag_rate = tx->u.tx.rate;
641 tx->u.tx.control->tx_rate = tx->u.tx.rate;
642 }
643 tx->u.tx.control->tx_rate = tx->u.tx.rate;
644
645 return TX_CONTINUE;
646 }
647
648 static ieee80211_tx_result
649 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
650 {
651 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
652 u16 fc = le16_to_cpu(hdr->frame_control);
653 u16 dur;
654 struct ieee80211_tx_control *control = tx->u.tx.control;
655
656 if (!control->retry_limit) {
657 if (!is_multicast_ether_addr(hdr->addr1)) {
658 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
659 && tx->local->rts_threshold <
660 IEEE80211_MAX_RTS_THRESHOLD) {
661 control->flags |=
662 IEEE80211_TXCTL_USE_RTS_CTS;
663 control->flags |=
664 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
665 control->retry_limit =
666 tx->local->long_retry_limit;
667 } else {
668 control->retry_limit =
669 tx->local->short_retry_limit;
670 }
671 } else {
672 control->retry_limit = 1;
673 }
674 }
675
676 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
677 /* Do not use multiple retry rates when sending fragmented
678 * frames.
679 * TODO: The last fragment could still use multiple retry
680 * rates. */
681 control->alt_retry_rate = NULL;
682 }
683
684 /* Use CTS protection for unicast frames sent using extended rates if
685 * there are associated non-ERP stations and RTS/CTS is not configured
686 * for the frame. */
687 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
688 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP_G) &&
689 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
690 tx->sdata->bss_conf.use_cts_prot &&
691 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
692 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
693
694 /* Transmit data frames using short preambles if the driver supports
695 * short preambles at the selected rate and short preambles are
696 * available on the network at the current point in time. */
697 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
698 (tx->u.tx.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
699 tx->sdata->bss_conf.use_short_preamble &&
700 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
701 tx->u.tx.control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
702 }
703
704 /* Setup duration field for the first fragment of the frame. Duration
705 * for remaining fragments will be updated when they are being sent
706 * to low-level driver in ieee80211_tx(). */
707 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
708 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
709 tx->u.tx.extra_frag[0]->len : 0);
710 hdr->duration_id = cpu_to_le16(dur);
711
712 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
713 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
714 struct ieee80211_supported_band *sband;
715 struct ieee80211_rate *rate, *baserate;
716 int idx;
717
718 sband = tx->local->hw.wiphy->bands[
719 tx->local->hw.conf.channel->band];
720
721 /* Do not use multiple retry rates when using RTS/CTS */
722 control->alt_retry_rate = NULL;
723
724 /* Use min(data rate, max base rate) as CTS/RTS rate */
725 rate = tx->u.tx.rate;
726 baserate = NULL;
727
728 for (idx = 0; idx < sband->n_bitrates; idx++) {
729 if (sband->bitrates[idx].bitrate > rate->bitrate)
730 continue;
731 if (tx->sdata->basic_rates & BIT(idx) &&
732 (!baserate ||
733 (baserate->bitrate < sband->bitrates[idx].bitrate)))
734 baserate = &sband->bitrates[idx];
735 }
736
737 if (baserate)
738 control->rts_cts_rate = baserate;
739 else
740 control->rts_cts_rate = &sband->bitrates[0];
741 }
742
743 if (tx->sta) {
744 tx->sta->tx_packets++;
745 tx->sta->tx_fragments++;
746 tx->sta->tx_bytes += tx->skb->len;
747 if (tx->u.tx.extra_frag) {
748 int i;
749 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
750 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
751 tx->sta->tx_bytes +=
752 tx->u.tx.extra_frag[i]->len;
753 }
754 }
755 }
756
757 return TX_CONTINUE;
758 }
759
760 static ieee80211_tx_result
761 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
762 {
763 struct ieee80211_local *local = tx->local;
764 struct sk_buff *skb = tx->skb;
765 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
766 u32 load = 0, hdrtime;
767 struct ieee80211_rate *rate = tx->u.tx.rate;
768
769 /* TODO: this could be part of tx_status handling, so that the number
770 * of retries would be known; TX rate should in that case be stored
771 * somewhere with the packet */
772
773 /* Estimate total channel use caused by this frame */
774
775 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
776 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
777
778 if (tx->u.tx.channel->band == IEEE80211_BAND_5GHZ ||
779 (tx->u.tx.channel->band == IEEE80211_BAND_2GHZ &&
780 rate->flags & IEEE80211_RATE_ERP_G))
781 hdrtime = CHAN_UTIL_HDR_SHORT;
782 else
783 hdrtime = CHAN_UTIL_HDR_LONG;
784
785 load = hdrtime;
786 if (!is_multicast_ether_addr(hdr->addr1))
787 load += hdrtime;
788
789 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
790 load += 2 * hdrtime;
791 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
792 load += hdrtime;
793
794 /* TODO: optimise again */
795 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
796
797 if (tx->u.tx.extra_frag) {
798 int i;
799 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
800 load += 2 * hdrtime;
801 load += tx->u.tx.extra_frag[i]->len *
802 tx->u.tx.rate->bitrate;
803 }
804 }
805
806 /* Divide channel_use by 8 to avoid wrapping around the counter */
807 load >>= CHAN_UTIL_SHIFT;
808 local->channel_use_raw += load;
809 if (tx->sta)
810 tx->sta->channel_use_raw += load;
811 tx->sdata->channel_use_raw += load;
812
813 return TX_CONTINUE;
814 }
815
816
817 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_txrx_data *);
818 static ieee80211_tx_handler ieee80211_tx_handlers[] =
819 {
820 ieee80211_tx_h_check_assoc,
821 ieee80211_tx_h_sequence,
822 ieee80211_tx_h_ps_buf,
823 ieee80211_tx_h_select_key,
824 ieee80211_tx_h_michael_mic_add,
825 ieee80211_tx_h_fragment,
826 ieee80211_tx_h_encrypt,
827 ieee80211_tx_h_rate_ctrl,
828 ieee80211_tx_h_misc,
829 ieee80211_tx_h_load_stats,
830 NULL
831 };
832
833 /* actual transmit path */
834
835 /*
836 * deal with packet injection down monitor interface
837 * with Radiotap Header -- only called for monitor mode interface
838 */
839 static ieee80211_tx_result
840 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
841 struct sk_buff *skb)
842 {
843 /*
844 * this is the moment to interpret and discard the radiotap header that
845 * must be at the start of the packet injected in Monitor mode
846 *
847 * Need to take some care with endian-ness since radiotap
848 * args are little-endian
849 */
850
851 struct ieee80211_radiotap_iterator iterator;
852 struct ieee80211_radiotap_header *rthdr =
853 (struct ieee80211_radiotap_header *) skb->data;
854 struct ieee80211_supported_band *sband;
855 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
856 struct ieee80211_tx_control *control = tx->u.tx.control;
857
858 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
859
860 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
861 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
862 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
863
864 /*
865 * for every radiotap entry that is present
866 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
867 * entries present, or -EINVAL on error)
868 */
869
870 while (!ret) {
871 int i, target_rate;
872
873 ret = ieee80211_radiotap_iterator_next(&iterator);
874
875 if (ret)
876 continue;
877
878 /* see if this argument is something we can use */
879 switch (iterator.this_arg_index) {
880 /*
881 * You must take care when dereferencing iterator.this_arg
882 * for multibyte types... the pointer is not aligned. Use
883 * get_unaligned((type *)iterator.this_arg) to dereference
884 * iterator.this_arg for type "type" safely on all arches.
885 */
886 case IEEE80211_RADIOTAP_RATE:
887 /*
888 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
889 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
890 */
891 target_rate = (*iterator.this_arg) * 5;
892 for (i = 0; i < sband->n_bitrates; i++) {
893 struct ieee80211_rate *r;
894
895 r = &sband->bitrates[i];
896
897 if (r->bitrate == target_rate) {
898 tx->u.tx.rate = r;
899 break;
900 }
901 }
902 break;
903
904 case IEEE80211_RADIOTAP_ANTENNA:
905 /*
906 * radiotap uses 0 for 1st ant, mac80211 is 1 for
907 * 1st ant
908 */
909 control->antenna_sel_tx = (*iterator.this_arg) + 1;
910 break;
911
912 #if 0
913 case IEEE80211_RADIOTAP_DBM_TX_POWER:
914 control->power_level = *iterator.this_arg;
915 break;
916 #endif
917
918 case IEEE80211_RADIOTAP_FLAGS:
919 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
920 /*
921 * this indicates that the skb we have been
922 * handed has the 32-bit FCS CRC at the end...
923 * we should react to that by snipping it off
924 * because it will be recomputed and added
925 * on transmission
926 */
927 if (skb->len < (iterator.max_length + FCS_LEN))
928 return TX_DROP;
929
930 skb_trim(skb, skb->len - FCS_LEN);
931 }
932 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
933 control->flags &=
934 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
935 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
936 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
937 break;
938
939 /*
940 * Please update the file
941 * Documentation/networking/mac80211-injection.txt
942 * when parsing new fields here.
943 */
944
945 default:
946 break;
947 }
948 }
949
950 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
951 return TX_DROP;
952
953 /*
954 * remove the radiotap header
955 * iterator->max_length was sanity-checked against
956 * skb->len by iterator init
957 */
958 skb_pull(skb, iterator.max_length);
959
960 return TX_CONTINUE;
961 }
962
963 /*
964 * initialises @tx
965 */
966 static ieee80211_tx_result
967 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
968 struct sk_buff *skb,
969 struct net_device *dev,
970 struct ieee80211_tx_control *control)
971 {
972 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
973 struct ieee80211_hdr *hdr;
974 struct ieee80211_sub_if_data *sdata;
975
976 int hdrlen;
977
978 memset(tx, 0, sizeof(*tx));
979 tx->skb = skb;
980 tx->dev = dev; /* use original interface */
981 tx->local = local;
982 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
983 tx->u.tx.control = control;
984 /*
985 * Set this flag (used below to indicate "automatic fragmentation"),
986 * it will be cleared/left by radiotap as desired.
987 */
988 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
989
990 /* process and remove the injection radiotap header */
991 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
992 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
993 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
994 return TX_DROP;
995
996 /*
997 * __ieee80211_parse_tx_radiotap has now removed
998 * the radiotap header that was present and pre-filled
999 * 'tx' with tx control information.
1000 */
1001 }
1002
1003 hdr = (struct ieee80211_hdr *) skb->data;
1004
1005 tx->sta = sta_info_get(local, hdr->addr1);
1006 tx->fc = le16_to_cpu(hdr->frame_control);
1007
1008 if (is_multicast_ether_addr(hdr->addr1)) {
1009 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
1010 control->flags |= IEEE80211_TXCTL_NO_ACK;
1011 } else {
1012 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
1013 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1014 }
1015
1016 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
1017 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
1018 skb->len + FCS_LEN > local->fragmentation_threshold &&
1019 !local->ops->set_frag_threshold)
1020 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
1021 else
1022 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
1023 }
1024
1025 if (!tx->sta)
1026 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1027 else if (tx->sta->clear_dst_mask) {
1028 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1029 tx->sta->clear_dst_mask = 0;
1030 }
1031
1032 hdrlen = ieee80211_get_hdrlen(tx->fc);
1033 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1034 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1035 tx->ethertype = (pos[0] << 8) | pos[1];
1036 }
1037 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1038
1039 return TX_CONTINUE;
1040 }
1041
1042 /*
1043 * NB: @tx is uninitialised when passed in here
1044 */
1045 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1046 struct sk_buff *skb,
1047 struct net_device *mdev,
1048 struct ieee80211_tx_control *control)
1049 {
1050 struct ieee80211_tx_packet_data *pkt_data;
1051 struct net_device *dev;
1052
1053 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1054 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1055 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1056 dev_put(dev);
1057 dev = NULL;
1058 }
1059 if (unlikely(!dev))
1060 return -ENODEV;
1061 /* initialises tx with control */
1062 __ieee80211_tx_prepare(tx, skb, dev, control);
1063 dev_put(dev);
1064 return 0;
1065 }
1066
1067 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1068 struct ieee80211_txrx_data *tx)
1069 {
1070 struct ieee80211_tx_control *control = tx->u.tx.control;
1071 int ret, i;
1072
1073 if (!ieee80211_qdisc_installed(local->mdev) &&
1074 __ieee80211_queue_stopped(local, 0)) {
1075 netif_stop_queue(local->mdev);
1076 return IEEE80211_TX_AGAIN;
1077 }
1078 if (skb) {
1079 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1080 "TX to low-level driver", skb);
1081 ret = local->ops->tx(local_to_hw(local), skb, control);
1082 if (ret)
1083 return IEEE80211_TX_AGAIN;
1084 local->mdev->trans_start = jiffies;
1085 ieee80211_led_tx(local, 1);
1086 }
1087 if (tx->u.tx.extra_frag) {
1088 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1089 IEEE80211_TXCTL_USE_CTS_PROTECT |
1090 IEEE80211_TXCTL_CLEAR_DST_MASK |
1091 IEEE80211_TXCTL_FIRST_FRAGMENT);
1092 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1093 if (!tx->u.tx.extra_frag[i])
1094 continue;
1095 if (__ieee80211_queue_stopped(local, control->queue))
1096 return IEEE80211_TX_FRAG_AGAIN;
1097 if (i == tx->u.tx.num_extra_frag) {
1098 control->tx_rate = tx->u.tx.last_frag_rate;
1099
1100 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1101 control->flags |=
1102 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1103 else
1104 control->flags &=
1105 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1106 }
1107
1108 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1109 "TX to low-level driver",
1110 tx->u.tx.extra_frag[i]);
1111 ret = local->ops->tx(local_to_hw(local),
1112 tx->u.tx.extra_frag[i],
1113 control);
1114 if (ret)
1115 return IEEE80211_TX_FRAG_AGAIN;
1116 local->mdev->trans_start = jiffies;
1117 ieee80211_led_tx(local, 1);
1118 tx->u.tx.extra_frag[i] = NULL;
1119 }
1120 kfree(tx->u.tx.extra_frag);
1121 tx->u.tx.extra_frag = NULL;
1122 }
1123 return IEEE80211_TX_OK;
1124 }
1125
1126 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1127 struct ieee80211_tx_control *control)
1128 {
1129 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1130 struct sta_info *sta;
1131 ieee80211_tx_handler *handler;
1132 struct ieee80211_txrx_data tx;
1133 ieee80211_tx_result res = TX_DROP, res_prepare;
1134 int ret, i;
1135
1136 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1137
1138 if (unlikely(skb->len < 10)) {
1139 dev_kfree_skb(skb);
1140 return 0;
1141 }
1142
1143 /* initialises tx */
1144 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1145
1146 if (res_prepare == TX_DROP) {
1147 dev_kfree_skb(skb);
1148 return 0;
1149 }
1150
1151 /*
1152 * key references are protected using RCU and this requires that
1153 * we are in a read-site RCU section during receive processing
1154 */
1155 rcu_read_lock();
1156
1157 sta = tx.sta;
1158 tx.u.tx.channel = local->hw.conf.channel;
1159
1160 for (handler = ieee80211_tx_handlers; *handler != NULL;
1161 handler++) {
1162 res = (*handler)(&tx);
1163 if (res != TX_CONTINUE)
1164 break;
1165 }
1166
1167 skb = tx.skb; /* handlers are allowed to change skb */
1168
1169 if (sta)
1170 sta_info_put(sta);
1171
1172 if (unlikely(res == TX_DROP)) {
1173 I802_DEBUG_INC(local->tx_handlers_drop);
1174 goto drop;
1175 }
1176
1177 if (unlikely(res == TX_QUEUED)) {
1178 I802_DEBUG_INC(local->tx_handlers_queued);
1179 rcu_read_unlock();
1180 return 0;
1181 }
1182
1183 if (tx.u.tx.extra_frag) {
1184 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1185 int next_len, dur;
1186 struct ieee80211_hdr *hdr =
1187 (struct ieee80211_hdr *)
1188 tx.u.tx.extra_frag[i]->data;
1189
1190 if (i + 1 < tx.u.tx.num_extra_frag) {
1191 next_len = tx.u.tx.extra_frag[i + 1]->len;
1192 } else {
1193 next_len = 0;
1194 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1195 }
1196 dur = ieee80211_duration(&tx, 0, next_len);
1197 hdr->duration_id = cpu_to_le16(dur);
1198 }
1199 }
1200
1201 retry:
1202 ret = __ieee80211_tx(local, skb, &tx);
1203 if (ret) {
1204 struct ieee80211_tx_stored_packet *store =
1205 &local->pending_packet[control->queue];
1206
1207 if (ret == IEEE80211_TX_FRAG_AGAIN)
1208 skb = NULL;
1209 set_bit(IEEE80211_LINK_STATE_PENDING,
1210 &local->state[control->queue]);
1211 smp_mb();
1212 /* When the driver gets out of buffers during sending of
1213 * fragments and calls ieee80211_stop_queue, there is
1214 * a small window between IEEE80211_LINK_STATE_XOFF and
1215 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1216 * gets available in that window (i.e. driver calls
1217 * ieee80211_wake_queue), we would end up with ieee80211_tx
1218 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1219 * continuing transmitting here when that situation is
1220 * possible to have happened. */
1221 if (!__ieee80211_queue_stopped(local, control->queue)) {
1222 clear_bit(IEEE80211_LINK_STATE_PENDING,
1223 &local->state[control->queue]);
1224 goto retry;
1225 }
1226 memcpy(&store->control, control,
1227 sizeof(struct ieee80211_tx_control));
1228 store->skb = skb;
1229 store->extra_frag = tx.u.tx.extra_frag;
1230 store->num_extra_frag = tx.u.tx.num_extra_frag;
1231 store->last_frag_rate = tx.u.tx.last_frag_rate;
1232 store->last_frag_rate_ctrl_probe =
1233 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1234 }
1235 rcu_read_unlock();
1236 return 0;
1237
1238 drop:
1239 if (skb)
1240 dev_kfree_skb(skb);
1241 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1242 if (tx.u.tx.extra_frag[i])
1243 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1244 kfree(tx.u.tx.extra_frag);
1245 rcu_read_unlock();
1246 return 0;
1247 }
1248
1249 /* device xmit handlers */
1250
1251 int ieee80211_master_start_xmit(struct sk_buff *skb,
1252 struct net_device *dev)
1253 {
1254 struct ieee80211_tx_control control;
1255 struct ieee80211_tx_packet_data *pkt_data;
1256 struct net_device *odev = NULL;
1257 struct ieee80211_sub_if_data *osdata;
1258 int headroom;
1259 int ret;
1260
1261 /*
1262 * copy control out of the skb so other people can use skb->cb
1263 */
1264 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1265 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1266
1267 if (pkt_data->ifindex)
1268 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1269 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1270 dev_put(odev);
1271 odev = NULL;
1272 }
1273 if (unlikely(!odev)) {
1274 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1275 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1276 "originating device\n", dev->name);
1277 #endif
1278 dev_kfree_skb(skb);
1279 return 0;
1280 }
1281 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1282
1283 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1284 if (skb_headroom(skb) < headroom) {
1285 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1286 dev_kfree_skb(skb);
1287 dev_put(odev);
1288 return 0;
1289 }
1290 }
1291
1292 control.vif = &osdata->vif;
1293 control.type = osdata->vif.type;
1294 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1295 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1296 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1297 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1298 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1299 control.flags |= IEEE80211_TXCTL_REQUEUE;
1300 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
1301 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
1302 if (pkt_data->flags & IEEE80211_TXPD_AMPDU)
1303 control.flags |= IEEE80211_TXCTL_AMPDU;
1304 control.queue = pkt_data->queue;
1305
1306 ret = ieee80211_tx(odev, skb, &control);
1307 dev_put(odev);
1308
1309 return ret;
1310 }
1311
1312 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1313 struct net_device *dev)
1314 {
1315 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1316 struct ieee80211_tx_packet_data *pkt_data;
1317 struct ieee80211_radiotap_header *prthdr =
1318 (struct ieee80211_radiotap_header *)skb->data;
1319 u16 len_rthdr;
1320
1321 /* check for not even having the fixed radiotap header part */
1322 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1323 goto fail; /* too short to be possibly valid */
1324
1325 /* is it a header version we can trust to find length from? */
1326 if (unlikely(prthdr->it_version))
1327 goto fail; /* only version 0 is supported */
1328
1329 /* then there must be a radiotap header with a length we can use */
1330 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1331
1332 /* does the skb contain enough to deliver on the alleged length? */
1333 if (unlikely(skb->len < len_rthdr))
1334 goto fail; /* skb too short for claimed rt header extent */
1335
1336 skb->dev = local->mdev;
1337
1338 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1339 memset(pkt_data, 0, sizeof(*pkt_data));
1340 /* needed because we set skb device to master */
1341 pkt_data->ifindex = dev->ifindex;
1342
1343 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1344
1345 /*
1346 * fix up the pointers accounting for the radiotap
1347 * header still being in there. We are being given
1348 * a precooked IEEE80211 header so no need for
1349 * normal processing
1350 */
1351 skb_set_mac_header(skb, len_rthdr);
1352 /*
1353 * these are just fixed to the end of the rt area since we
1354 * don't have any better information and at this point, nobody cares
1355 */
1356 skb_set_network_header(skb, len_rthdr);
1357 skb_set_transport_header(skb, len_rthdr);
1358
1359 /* pass the radiotap header up to the next stage intact */
1360 dev_queue_xmit(skb);
1361 return NETDEV_TX_OK;
1362
1363 fail:
1364 dev_kfree_skb(skb);
1365 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1366 }
1367
1368 /**
1369 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1370 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1371 * @skb: packet to be sent
1372 * @dev: incoming interface
1373 *
1374 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1375 * not be freed, and caller is responsible for either retrying later or freeing
1376 * skb).
1377 *
1378 * This function takes in an Ethernet header and encapsulates it with suitable
1379 * IEEE 802.11 header based on which interface the packet is coming in. The
1380 * encapsulated packet will then be passed to master interface, wlan#.11, for
1381 * transmission (through low-level driver).
1382 */
1383 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1384 struct net_device *dev)
1385 {
1386 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1387 struct ieee80211_tx_packet_data *pkt_data;
1388 struct ieee80211_sub_if_data *sdata;
1389 int ret = 1, head_need;
1390 u16 ethertype, hdrlen, fc;
1391 struct ieee80211_hdr hdr;
1392 const u8 *encaps_data;
1393 int encaps_len, skip_header_bytes;
1394 int nh_pos, h_pos;
1395 struct sta_info *sta;
1396 u32 sta_flags = 0;
1397
1398 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1399 if (unlikely(skb->len < ETH_HLEN)) {
1400 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1401 dev->name, skb->len);
1402 ret = 0;
1403 goto fail;
1404 }
1405
1406 nh_pos = skb_network_header(skb) - skb->data;
1407 h_pos = skb_transport_header(skb) - skb->data;
1408
1409 /* convert Ethernet header to proper 802.11 header (based on
1410 * operation mode) */
1411 ethertype = (skb->data[12] << 8) | skb->data[13];
1412 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1413
1414 switch (sdata->vif.type) {
1415 case IEEE80211_IF_TYPE_AP:
1416 case IEEE80211_IF_TYPE_VLAN:
1417 fc |= IEEE80211_FCTL_FROMDS;
1418 /* DA BSSID SA */
1419 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1420 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1421 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1422 hdrlen = 24;
1423 break;
1424 case IEEE80211_IF_TYPE_WDS:
1425 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1426 /* RA TA DA SA */
1427 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1428 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1429 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1430 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1431 hdrlen = 30;
1432 break;
1433 case IEEE80211_IF_TYPE_STA:
1434 fc |= IEEE80211_FCTL_TODS;
1435 /* BSSID SA DA */
1436 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1437 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1438 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1439 hdrlen = 24;
1440 break;
1441 case IEEE80211_IF_TYPE_IBSS:
1442 /* DA SA BSSID */
1443 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1444 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1445 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1446 hdrlen = 24;
1447 break;
1448 default:
1449 ret = 0;
1450 goto fail;
1451 }
1452
1453 /*
1454 * There's no need to try to look up the destination
1455 * if it is a multicast address (which can only happen
1456 * in AP mode)
1457 */
1458 if (!is_multicast_ether_addr(hdr.addr1)) {
1459 sta = sta_info_get(local, hdr.addr1);
1460 if (sta) {
1461 sta_flags = sta->flags;
1462 sta_info_put(sta);
1463 }
1464 }
1465
1466 /* receiver is QoS enabled, use a QoS type frame */
1467 if (sta_flags & WLAN_STA_WME) {
1468 fc |= IEEE80211_STYPE_QOS_DATA;
1469 hdrlen += 2;
1470 }
1471
1472 /*
1473 * Drop unicast frames to unauthorised stations unless they are
1474 * EAPOL frames from the local station.
1475 */
1476 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1477 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1478 !(ethertype == ETH_P_PAE &&
1479 compare_ether_addr(dev->dev_addr,
1480 skb->data + ETH_ALEN) == 0))) {
1481 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1482 DECLARE_MAC_BUF(mac);
1483
1484 if (net_ratelimit())
1485 printk(KERN_DEBUG "%s: dropped frame to %s"
1486 " (unauthorized port)\n", dev->name,
1487 print_mac(mac, hdr.addr1));
1488 #endif
1489
1490 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1491
1492 ret = 0;
1493 goto fail;
1494 }
1495
1496 hdr.frame_control = cpu_to_le16(fc);
1497 hdr.duration_id = 0;
1498 hdr.seq_ctrl = 0;
1499
1500 skip_header_bytes = ETH_HLEN;
1501 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1502 encaps_data = bridge_tunnel_header;
1503 encaps_len = sizeof(bridge_tunnel_header);
1504 skip_header_bytes -= 2;
1505 } else if (ethertype >= 0x600) {
1506 encaps_data = rfc1042_header;
1507 encaps_len = sizeof(rfc1042_header);
1508 skip_header_bytes -= 2;
1509 } else {
1510 encaps_data = NULL;
1511 encaps_len = 0;
1512 }
1513
1514 skb_pull(skb, skip_header_bytes);
1515 nh_pos -= skip_header_bytes;
1516 h_pos -= skip_header_bytes;
1517
1518 /* TODO: implement support for fragments so that there is no need to
1519 * reallocate and copy payload; it might be enough to support one
1520 * extra fragment that would be copied in the beginning of the frame
1521 * data.. anyway, it would be nice to include this into skb structure
1522 * somehow
1523 *
1524 * There are few options for this:
1525 * use skb->cb as an extra space for 802.11 header
1526 * allocate new buffer if not enough headroom
1527 * make sure that there is enough headroom in every skb by increasing
1528 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1529 * alloc_skb() (net/core/skbuff.c)
1530 */
1531 head_need = hdrlen + encaps_len + local->tx_headroom;
1532 head_need -= skb_headroom(skb);
1533
1534 /* We are going to modify skb data, so make a copy of it if happens to
1535 * be cloned. This could happen, e.g., with Linux bridge code passing
1536 * us broadcast frames. */
1537
1538 if (head_need > 0 || skb_cloned(skb)) {
1539 #if 0
1540 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1541 "of headroom\n", dev->name, head_need);
1542 #endif
1543
1544 if (skb_cloned(skb))
1545 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1546 else
1547 I802_DEBUG_INC(local->tx_expand_skb_head);
1548 /* Since we have to reallocate the buffer, make sure that there
1549 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1550 * before payload and 12 after). */
1551 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1552 12, GFP_ATOMIC)) {
1553 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1554 "\n", dev->name);
1555 goto fail;
1556 }
1557 }
1558
1559 if (encaps_data) {
1560 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1561 nh_pos += encaps_len;
1562 h_pos += encaps_len;
1563 }
1564
1565 if (fc & IEEE80211_STYPE_QOS_DATA) {
1566 __le16 *qos_control;
1567
1568 qos_control = (__le16*) skb_push(skb, 2);
1569 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1570 /*
1571 * Maybe we could actually set some fields here, for now just
1572 * initialise to zero to indicate no special operation.
1573 */
1574 *qos_control = 0;
1575 } else
1576 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1577
1578 nh_pos += hdrlen;
1579 h_pos += hdrlen;
1580
1581 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1582 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1583 pkt_data->ifindex = dev->ifindex;
1584 if (ethertype == ETH_P_PAE)
1585 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1586
1587 skb->dev = local->mdev;
1588 dev->stats.tx_packets++;
1589 dev->stats.tx_bytes += skb->len;
1590
1591 /* Update skb pointers to various headers since this modified frame
1592 * is going to go through Linux networking code that may potentially
1593 * need things like pointer to IP header. */
1594 skb_set_mac_header(skb, 0);
1595 skb_set_network_header(skb, nh_pos);
1596 skb_set_transport_header(skb, h_pos);
1597
1598 dev->trans_start = jiffies;
1599 dev_queue_xmit(skb);
1600
1601 return 0;
1602
1603 fail:
1604 if (!ret)
1605 dev_kfree_skb(skb);
1606
1607 return ret;
1608 }
1609
1610 /* helper functions for pending packets for when queues are stopped */
1611
1612 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1613 {
1614 int i, j;
1615 struct ieee80211_tx_stored_packet *store;
1616
1617 for (i = 0; i < local->hw.queues; i++) {
1618 if (!__ieee80211_queue_pending(local, i))
1619 continue;
1620 store = &local->pending_packet[i];
1621 kfree_skb(store->skb);
1622 for (j = 0; j < store->num_extra_frag; j++)
1623 kfree_skb(store->extra_frag[j]);
1624 kfree(store->extra_frag);
1625 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1626 }
1627 }
1628
1629 void ieee80211_tx_pending(unsigned long data)
1630 {
1631 struct ieee80211_local *local = (struct ieee80211_local *)data;
1632 struct net_device *dev = local->mdev;
1633 struct ieee80211_tx_stored_packet *store;
1634 struct ieee80211_txrx_data tx;
1635 int i, ret, reschedule = 0;
1636
1637 netif_tx_lock_bh(dev);
1638 for (i = 0; i < local->hw.queues; i++) {
1639 if (__ieee80211_queue_stopped(local, i))
1640 continue;
1641 if (!__ieee80211_queue_pending(local, i)) {
1642 reschedule = 1;
1643 continue;
1644 }
1645 store = &local->pending_packet[i];
1646 tx.u.tx.control = &store->control;
1647 tx.u.tx.extra_frag = store->extra_frag;
1648 tx.u.tx.num_extra_frag = store->num_extra_frag;
1649 tx.u.tx.last_frag_rate = store->last_frag_rate;
1650 tx.flags = 0;
1651 if (store->last_frag_rate_ctrl_probe)
1652 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1653 ret = __ieee80211_tx(local, store->skb, &tx);
1654 if (ret) {
1655 if (ret == IEEE80211_TX_FRAG_AGAIN)
1656 store->skb = NULL;
1657 } else {
1658 clear_bit(IEEE80211_LINK_STATE_PENDING,
1659 &local->state[i]);
1660 reschedule = 1;
1661 }
1662 }
1663 netif_tx_unlock_bh(dev);
1664 if (reschedule) {
1665 if (!ieee80211_qdisc_installed(dev)) {
1666 if (!__ieee80211_queue_stopped(local, 0))
1667 netif_wake_queue(dev);
1668 } else
1669 netif_schedule(dev);
1670 }
1671 }
1672
1673 /* functions for drivers to get certain frames */
1674
1675 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1676 struct ieee80211_if_ap *bss,
1677 struct sk_buff *skb,
1678 struct beacon_data *beacon)
1679 {
1680 u8 *pos, *tim;
1681 int aid0 = 0;
1682 int i, have_bits = 0, n1, n2;
1683
1684 /* Generate bitmap for TIM only if there are any STAs in power save
1685 * mode. */
1686 read_lock_bh(&local->sta_lock);
1687 if (atomic_read(&bss->num_sta_ps) > 0)
1688 /* in the hope that this is faster than
1689 * checking byte-for-byte */
1690 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1691 IEEE80211_MAX_AID+1);
1692
1693 if (bss->dtim_count == 0)
1694 bss->dtim_count = beacon->dtim_period - 1;
1695 else
1696 bss->dtim_count--;
1697
1698 tim = pos = (u8 *) skb_put(skb, 6);
1699 *pos++ = WLAN_EID_TIM;
1700 *pos++ = 4;
1701 *pos++ = bss->dtim_count;
1702 *pos++ = beacon->dtim_period;
1703
1704 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1705 aid0 = 1;
1706
1707 if (have_bits) {
1708 /* Find largest even number N1 so that bits numbered 1 through
1709 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1710 * (N2 + 1) x 8 through 2007 are 0. */
1711 n1 = 0;
1712 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1713 if (bss->tim[i]) {
1714 n1 = i & 0xfe;
1715 break;
1716 }
1717 }
1718 n2 = n1;
1719 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1720 if (bss->tim[i]) {
1721 n2 = i;
1722 break;
1723 }
1724 }
1725
1726 /* Bitmap control */
1727 *pos++ = n1 | aid0;
1728 /* Part Virt Bitmap */
1729 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1730
1731 tim[1] = n2 - n1 + 4;
1732 skb_put(skb, n2 - n1);
1733 } else {
1734 *pos++ = aid0; /* Bitmap control */
1735 *pos++ = 0; /* Part Virt Bitmap */
1736 }
1737 read_unlock_bh(&local->sta_lock);
1738 }
1739
1740 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1741 struct ieee80211_vif *vif,
1742 struct ieee80211_tx_control *control)
1743 {
1744 struct ieee80211_local *local = hw_to_local(hw);
1745 struct sk_buff *skb;
1746 struct net_device *bdev;
1747 struct ieee80211_sub_if_data *sdata = NULL;
1748 struct ieee80211_if_ap *ap = NULL;
1749 struct rate_selection rsel;
1750 struct beacon_data *beacon;
1751 struct ieee80211_supported_band *sband;
1752
1753 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1754
1755 rcu_read_lock();
1756
1757 sdata = vif_to_sdata(vif);
1758 bdev = sdata->dev;
1759 ap = &sdata->u.ap;
1760
1761 beacon = rcu_dereference(ap->beacon);
1762
1763 if (!ap || sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon) {
1764 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1765 if (net_ratelimit())
1766 printk(KERN_DEBUG "no beacon data avail for %s\n",
1767 bdev->name);
1768 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1769 skb = NULL;
1770 goto out;
1771 }
1772
1773 /* headroom, head length, tail length and maximum TIM length */
1774 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
1775 beacon->tail_len + 256);
1776 if (!skb)
1777 goto out;
1778
1779 skb_reserve(skb, local->tx_headroom);
1780 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1781 beacon->head_len);
1782
1783 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1784
1785 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1786
1787 if (beacon->tail)
1788 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
1789 beacon->tail_len);
1790
1791 if (control) {
1792 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1793 if (!rsel.rate) {
1794 if (net_ratelimit()) {
1795 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1796 "no rate found\n",
1797 wiphy_name(local->hw.wiphy));
1798 }
1799 dev_kfree_skb(skb);
1800 skb = NULL;
1801 goto out;
1802 }
1803
1804 control->vif = vif;
1805 control->tx_rate = rsel.rate;
1806 if (sdata->bss_conf.use_short_preamble &&
1807 rsel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
1808 control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
1809 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1810 control->flags |= IEEE80211_TXCTL_NO_ACK;
1811 control->retry_limit = 1;
1812 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1813 }
1814
1815 ap->num_beacons++;
1816
1817 out:
1818 rcu_read_unlock();
1819 return skb;
1820 }
1821 EXPORT_SYMBOL(ieee80211_beacon_get);
1822
1823 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1824 const void *frame, size_t frame_len,
1825 const struct ieee80211_tx_control *frame_txctl,
1826 struct ieee80211_rts *rts)
1827 {
1828 const struct ieee80211_hdr *hdr = frame;
1829 u16 fctl;
1830
1831 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1832 rts->frame_control = cpu_to_le16(fctl);
1833 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1834 frame_txctl);
1835 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1836 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1837 }
1838 EXPORT_SYMBOL(ieee80211_rts_get);
1839
1840 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1841 const void *frame, size_t frame_len,
1842 const struct ieee80211_tx_control *frame_txctl,
1843 struct ieee80211_cts *cts)
1844 {
1845 const struct ieee80211_hdr *hdr = frame;
1846 u16 fctl;
1847
1848 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1849 cts->frame_control = cpu_to_le16(fctl);
1850 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1851 frame_len, frame_txctl);
1852 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1853 }
1854 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1855
1856 struct sk_buff *
1857 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1858 struct ieee80211_vif *vif,
1859 struct ieee80211_tx_control *control)
1860 {
1861 struct ieee80211_local *local = hw_to_local(hw);
1862 struct sk_buff *skb;
1863 struct sta_info *sta;
1864 ieee80211_tx_handler *handler;
1865 struct ieee80211_txrx_data tx;
1866 ieee80211_tx_result res = TX_DROP;
1867 struct net_device *bdev;
1868 struct ieee80211_sub_if_data *sdata;
1869 struct ieee80211_if_ap *bss = NULL;
1870 struct beacon_data *beacon;
1871
1872 sdata = vif_to_sdata(vif);
1873 bdev = sdata->dev;
1874
1875
1876 if (!bss)
1877 return NULL;
1878
1879 rcu_read_lock();
1880 beacon = rcu_dereference(bss->beacon);
1881
1882 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1883 !beacon->head) {
1884 rcu_read_unlock();
1885 return NULL;
1886 }
1887 rcu_read_unlock();
1888
1889 if (bss->dtim_count != 0)
1890 return NULL; /* send buffered bc/mc only after DTIM beacon */
1891 memset(control, 0, sizeof(*control));
1892 while (1) {
1893 skb = skb_dequeue(&bss->ps_bc_buf);
1894 if (!skb)
1895 return NULL;
1896 local->total_ps_buffered--;
1897
1898 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1899 struct ieee80211_hdr *hdr =
1900 (struct ieee80211_hdr *) skb->data;
1901 /* more buffered multicast/broadcast frames ==> set
1902 * MoreData flag in IEEE 802.11 header to inform PS
1903 * STAs */
1904 hdr->frame_control |=
1905 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1906 }
1907
1908 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1909 break;
1910 dev_kfree_skb_any(skb);
1911 }
1912 sta = tx.sta;
1913 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1914 tx.u.tx.channel = local->hw.conf.channel;
1915
1916 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
1917 res = (*handler)(&tx);
1918 if (res == TX_DROP || res == TX_QUEUED)
1919 break;
1920 }
1921 skb = tx.skb; /* handlers are allowed to change skb */
1922
1923 if (res == TX_DROP) {
1924 I802_DEBUG_INC(local->tx_handlers_drop);
1925 dev_kfree_skb(skb);
1926 skb = NULL;
1927 } else if (res == TX_QUEUED) {
1928 I802_DEBUG_INC(local->tx_handlers_queued);
1929 skb = NULL;
1930 }
1931
1932 if (sta)
1933 sta_info_put(sta);
1934
1935 return skb;
1936 }
1937 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
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