projects / openwrt / openwrt.git / blob
? search:


957ec3c830679fbf1b3cae2f6c9911a8cc182b4f
[openwrt/openwrt.git] / package / mac80211 / src / 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/ieee80211_radiotap.h>
22 #include <net/cfg80211.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "ieee80211_led.h"
28 #include "wep.h"
29 #include "wpa.h"
30 #include "wme.h"
31 #include "ieee80211_rate.h"
32
33 #define IEEE80211_TX_OK 0
34 #define IEEE80211_TX_AGAIN 1
35 #define IEEE80211_TX_FRAG_AGAIN 2
36
37 /* misc utils */
38
39 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
40 struct ieee80211_hdr *hdr)
41 {
42 /* Set the sequence number for this frame. */
43 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
44
45 /* Increase the sequence number. */
46 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
47 }
48
49 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
50 static void ieee80211_dump_frame(const char *ifname, const char *title,
51 const struct sk_buff *skb)
52 {
53 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
54 u16 fc;
55 int hdrlen;
56
57 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
58 if (skb->len < 4) {
59 printk("\n");
60 return;
61 }
62
63 fc = le16_to_cpu(hdr->frame_control);
64 hdrlen = ieee80211_get_hdrlen(fc);
65 if (hdrlen > skb->len)
66 hdrlen = skb->len;
67 if (hdrlen >= 4)
68 printk(" FC=0x%04x DUR=0x%04x",
69 fc, le16_to_cpu(hdr->duration_id));
70 if (hdrlen >= 10)
71 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
72 if (hdrlen >= 16)
73 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
74 if (hdrlen >= 24)
75 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
76 if (hdrlen >= 30)
77 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
78 printk("\n");
79 }
80 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
81 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
82 struct sk_buff *skb)
83 {
84 }
85 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
86
87 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
88 int next_frag_len)
89 {
90 int rate, mrate, erp, dur, i;
91 struct ieee80211_rate *txrate = tx->u.tx.rate;
92 struct ieee80211_local *local = tx->local;
93 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
94
95 erp = txrate->flags & IEEE80211_RATE_ERP;
96
97 /*
98 * data and mgmt (except PS Poll):
99 * - during CFP: 32768
100 * - during contention period:
101 * if addr1 is group address: 0
102 * if more fragments = 0 and addr1 is individual address: time to
103 * transmit one ACK plus SIFS
104 * if more fragments = 1 and addr1 is individual address: time to
105 * transmit next fragment plus 2 x ACK plus 3 x SIFS
106 *
107 * IEEE 802.11, 9.6:
108 * - control response frame (CTS or ACK) shall be transmitted using the
109 * same rate as the immediately previous frame in the frame exchange
110 * sequence, if this rate belongs to the PHY mandatory rates, or else
111 * at the highest possible rate belonging to the PHY rates in the
112 * BSSBasicRateSet
113 */
114
115 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
116 /* TODO: These control frames are not currently sent by
117 * 80211.o, but should they be implemented, this function
118 * needs to be updated to support duration field calculation.
119 *
120 * RTS: time needed to transmit pending data/mgmt frame plus
121 * one CTS frame plus one ACK frame plus 3 x SIFS
122 * CTS: duration of immediately previous RTS minus time
123 * required to transmit CTS and its SIFS
124 * ACK: 0 if immediately previous directed data/mgmt had
125 * more=0, with more=1 duration in ACK frame is duration
126 * from previous frame minus time needed to transmit ACK
127 * and its SIFS
128 * PS Poll: BIT(15) | BIT(14) | aid
129 */
130 return 0;
131 }
132
133 /* data/mgmt */
134 if (0 /* FIX: data/mgmt during CFP */)
135 return 32768;
136
137 if (group_addr) /* Group address as the destination - no ACK */
138 return 0;
139
140 /* Individual destination address:
141 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
142 * CTS and ACK frames shall be transmitted using the highest rate in
143 * basic rate set that is less than or equal to the rate of the
144 * immediately previous frame and that is using the same modulation
145 * (CCK or OFDM). If no basic rate set matches with these requirements,
146 * the highest mandatory rate of the PHY that is less than or equal to
147 * the rate of the previous frame is used.
148 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
149 */
150 rate = -1;
151 mrate = 10; /* use 1 Mbps if everything fails */
152 for (i = 0; i < mode->num_rates; i++) {
153 struct ieee80211_rate *r = &mode->rates[i];
154 if (r->rate > txrate->rate)
155 break;
156
157 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
158 IEEE80211_RATE_MODULATION(r->flags))
159 continue;
160
161 if (r->flags & IEEE80211_RATE_BASIC)
162 rate = r->rate;
163 else if (r->flags & IEEE80211_RATE_MANDATORY)
164 mrate = r->rate;
165 }
166 if (rate == -1) {
167 /* No matching basic rate found; use highest suitable mandatory
168 * PHY rate */
169 rate = mrate;
170 }
171
172 /* Time needed to transmit ACK
173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
174 * to closest integer */
175
176 dur = ieee80211_frame_duration(local, 10, rate, erp,
177 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
178
179 if (next_frag_len) {
180 /* Frame is fragmented: duration increases with time needed to
181 * transmit next fragment plus ACK and 2 x SIFS. */
182 dur *= 2; /* ACK + SIFS */
183 /* next fragment */
184 dur += ieee80211_frame_duration(local, next_frag_len,
185 txrate->rate, erp,
186 tx->sdata->flags &
187 IEEE80211_SDATA_SHORT_PREAMBLE);
188 }
189
190 return dur;
191 }
192
193 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
194 int queue)
195 {
196 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
197 }
198
199 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
200 int queue)
201 {
202 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
203 }
204
205 static int inline is_ieee80211_device(struct net_device *dev,
206 struct net_device *master)
207 {
208 return (wdev_priv(dev->ieee80211_ptr) ==
209 wdev_priv(master->ieee80211_ptr));
210 }
211
212 /* tx handlers */
213
214 static ieee80211_txrx_result
215 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
216 {
217 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
218 struct sk_buff *skb = tx->skb;
219 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
220 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
221 u32 sta_flags;
222
223 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
224 return TXRX_CONTINUE;
225
226 if (unlikely(tx->local->sta_scanning != 0) &&
227 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
228 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
229 return TXRX_DROP;
230
231 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
232 return TXRX_CONTINUE;
233
234 sta_flags = tx->sta ? tx->sta->flags : 0;
235
236 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
237 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
238 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
239 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
240 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
241 printk(KERN_DEBUG "%s: dropped data frame to not "
242 "associated station " MAC_FMT "\n",
243 tx->dev->name, MAC_ARG(hdr->addr1));
244 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
245 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
246 return TXRX_DROP;
247 }
248 } else {
249 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
250 tx->local->num_sta == 0 &&
251 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
252 /*
253 * No associated STAs - no need to send multicast
254 * frames.
255 */
256 return TXRX_DROP;
257 }
258 return TXRX_CONTINUE;
259 }
260
261 if (unlikely(/* !injected && */ tx->sdata->ieee802_1x &&
262 !(sta_flags & WLAN_STA_AUTHORIZED))) {
263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
264 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
265 " (unauthorized port)\n", tx->dev->name,
266 MAC_ARG(hdr->addr1));
267 #endif
268 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
269 return TXRX_DROP;
270 }
271
272 return TXRX_CONTINUE;
273 }
274
275 static ieee80211_txrx_result
276 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
277 {
278 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
279
280 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
281 ieee80211_include_sequence(tx->sdata, hdr);
282
283 return TXRX_CONTINUE;
284 }
285
286 /* This function is called whenever the AP is about to exceed the maximum limit
287 * of buffered frames for power saving STAs. This situation should not really
288 * happen often during normal operation, so dropping the oldest buffered packet
289 * from each queue should be OK to make some room for new frames. */
290 static void purge_old_ps_buffers(struct ieee80211_local *local)
291 {
292 int total = 0, purged = 0;
293 struct sk_buff *skb;
294 struct ieee80211_sub_if_data *sdata;
295 struct sta_info *sta;
296
297 /*
298 * virtual interfaces are protected by RCU
299 */
300 rcu_read_lock();
301
302 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
303 struct ieee80211_if_ap *ap;
304 if (sdata->dev == local->mdev ||
305 sdata->type != IEEE80211_IF_TYPE_AP)
306 continue;
307 ap = &sdata->u.ap;
308 skb = skb_dequeue(&ap->ps_bc_buf);
309 if (skb) {
310 purged++;
311 dev_kfree_skb(skb);
312 }
313 total += skb_queue_len(&ap->ps_bc_buf);
314 }
315 rcu_read_unlock();
316
317 read_lock_bh(&local->sta_lock);
318 list_for_each_entry(sta, &local->sta_list, list) {
319 skb = skb_dequeue(&sta->ps_tx_buf);
320 if (skb) {
321 purged++;
322 dev_kfree_skb(skb);
323 }
324 total += skb_queue_len(&sta->ps_tx_buf);
325 }
326 read_unlock_bh(&local->sta_lock);
327
328 local->total_ps_buffered = total;
329 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
330 wiphy_name(local->hw.wiphy), purged);
331 }
332
333 static inline ieee80211_txrx_result
334 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
335 {
336 /* broadcast/multicast frame */
337 /* If any of the associated stations is in power save mode,
338 * the frame is buffered to be sent after DTIM beacon frame */
339 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
340 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
341 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
342 !(tx->fc & IEEE80211_FCTL_ORDER)) {
343 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
344 purge_old_ps_buffers(tx->local);
345 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
346 AP_MAX_BC_BUFFER) {
347 if (net_ratelimit()) {
348 printk(KERN_DEBUG "%s: BC TX buffer full - "
349 "dropping the oldest frame\n",
350 tx->dev->name);
351 }
352 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
353 } else
354 tx->local->total_ps_buffered++;
355 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
356 return TXRX_QUEUED;
357 }
358
359 return TXRX_CONTINUE;
360 }
361
362 static inline ieee80211_txrx_result
363 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
364 {
365 struct sta_info *sta = tx->sta;
366
367 if (unlikely(!sta ||
368 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
369 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
370 return TXRX_CONTINUE;
371
372 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
373 struct ieee80211_tx_packet_data *pkt_data;
374 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
375 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
376 "before %d)\n",
377 MAC_ARG(sta->addr), sta->aid,
378 skb_queue_len(&sta->ps_tx_buf));
379 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
380 sta->flags |= WLAN_STA_TIM;
381 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
382 purge_old_ps_buffers(tx->local);
383 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
384 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
385 if (net_ratelimit()) {
386 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
387 "buffer full - dropping oldest frame\n",
388 tx->dev->name, MAC_ARG(sta->addr));
389 }
390 dev_kfree_skb(old);
391 } else
392 tx->local->total_ps_buffered++;
393 /* Queue frame to be sent after STA sends an PS Poll frame */
394 if (skb_queue_empty(&sta->ps_tx_buf)) {
395 if (tx->local->ops->set_tim)
396 tx->local->ops->set_tim(local_to_hw(tx->local),
397 sta->aid, 1);
398 if (tx->sdata->bss)
399 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
400 }
401 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
402 pkt_data->jiffies = jiffies;
403 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
404 return TXRX_QUEUED;
405 }
406 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
407 else if (unlikely(sta->flags & WLAN_STA_PS)) {
408 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
409 "set -> send frame\n", tx->dev->name,
410 MAC_ARG(sta->addr));
411 }
412 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
413 sta->pspoll = 0;
414
415 return TXRX_CONTINUE;
416 }
417
418
419 static ieee80211_txrx_result
420 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
421 {
422 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
423 return TXRX_CONTINUE;
424
425 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
426 return ieee80211_tx_h_unicast_ps_buf(tx);
427 else
428 return ieee80211_tx_h_multicast_ps_buf(tx);
429 }
430
431
432
433
434 static ieee80211_txrx_result
435 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
436 {
437 struct ieee80211_key *key;
438
439 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
440 tx->key = NULL;
441 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
442 tx->key = key;
443 else if ((key = rcu_dereference(tx->sdata->default_key)))
444 tx->key = key;
445 else if (tx->sdata->drop_unencrypted &&
446 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
447 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
448 return TXRX_DROP;
449 } else {
450 tx->key = NULL;
451 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
452 }
453
454 if (tx->key) {
455 tx->key->tx_rx_count++;
456 /* TODO: add threshold stuff again */
457 }
458
459 return TXRX_CONTINUE;
460 }
461
462 static ieee80211_txrx_result
463 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
464 {
465 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
466 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
467 struct sk_buff **frags, *first, *frag;
468 int i;
469 u16 seq;
470 u8 *pos;
471 int frag_threshold = tx->local->fragmentation_threshold;
472
473 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
474 return TXRX_CONTINUE;
475
476 first = tx->skb;
477
478 hdrlen = ieee80211_get_hdrlen(tx->fc);
479 payload_len = first->len - hdrlen;
480 per_fragm = frag_threshold - hdrlen - FCS_LEN;
481 num_fragm = (payload_len + per_fragm - 1) / per_fragm;
482
483 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
484 if (!frags)
485 goto fail;
486
487 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
488 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
489 pos = first->data + hdrlen + per_fragm;
490 left = payload_len - per_fragm;
491 for (i = 0; i < num_fragm - 1; i++) {
492 struct ieee80211_hdr *fhdr;
493 size_t copylen;
494
495 if (left <= 0)
496 goto fail;
497
498 /* reserve enough extra head and tail room for possible
499 * encryption */
500 frag = frags[i] =
501 dev_alloc_skb(tx->local->tx_headroom +
502 frag_threshold +
503 IEEE80211_ENCRYPT_HEADROOM +
504 IEEE80211_ENCRYPT_TAILROOM);
505 if (!frag)
506 goto fail;
507 /* Make sure that all fragments use the same priority so
508 * that they end up using the same TX queue */
509 frag->priority = first->priority;
510 skb_reserve(frag, tx->local->tx_headroom +
511 IEEE80211_ENCRYPT_HEADROOM);
512 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
513 memcpy(fhdr, first->data, hdrlen);
514 if (i == num_fragm - 2)
515 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
516 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
517 copylen = left > per_fragm ? per_fragm : left;
518 memcpy(skb_put(frag, copylen), pos, copylen);
519
520 pos += copylen;
521 left -= copylen;
522 }
523 skb_trim(first, hdrlen + per_fragm);
524
525 tx->u.tx.num_extra_frag = num_fragm - 1;
526 tx->u.tx.extra_frag = frags;
527
528 return TXRX_CONTINUE;
529
530 fail:
531 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
532 if (frags) {
533 for (i = 0; i < num_fragm - 1; i++)
534 if (frags[i])
535 dev_kfree_skb(frags[i]);
536 kfree(frags);
537 }
538 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
539 return TXRX_DROP;
540 }
541
542 static ieee80211_txrx_result
543 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
544 {
545 if (!tx->key)
546 return TXRX_CONTINUE;
547
548 switch (tx->key->conf.alg) {
549 case ALG_WEP:
550 return ieee80211_crypto_wep_encrypt(tx);
551 case ALG_TKIP:
552 return ieee80211_crypto_tkip_encrypt(tx);
553 case ALG_CCMP:
554 return ieee80211_crypto_ccmp_encrypt(tx);
555 }
556
557 /* not reached */
558 WARN_ON(1);
559 return TXRX_DROP;
560 }
561
562 static ieee80211_txrx_result
563 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
564 {
565 struct rate_control_extra extra;
566
567 if (likely(!tx->u.tx.rate)) {
568 memset(&extra, 0, sizeof(extra));
569 extra.mode = tx->u.tx.mode;
570 extra.ethertype = tx->ethertype;
571
572 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev,
573 tx->skb, &extra);
574 if (unlikely(extra.probe != NULL)) {
575 tx->u.tx.control->flags |=
576 IEEE80211_TXCTL_RATE_CTRL_PROBE;
577 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
578 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
579 tx->u.tx.rate = extra.probe;
580 } else
581 tx->u.tx.control->alt_retry_rate = -1;
582
583 if (!tx->u.tx.rate)
584 return TXRX_DROP;
585 } else
586 tx->u.tx.control->alt_retry_rate = -1;
587
588 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
589 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
590 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
591 tx->u.tx.last_frag_rate = tx->u.tx.rate;
592 if (extra.probe)
593 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
594 else
595 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
596 tx->u.tx.rate = extra.nonerp;
597 tx->u.tx.control->rate = extra.nonerp;
598 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
599 } else {
600 tx->u.tx.last_frag_rate = tx->u.tx.rate;
601 tx->u.tx.control->rate = tx->u.tx.rate;
602 }
603 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
604
605 return TXRX_CONTINUE;
606 }
607
608 static ieee80211_txrx_result
609 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
610 {
611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
612 u16 fc = le16_to_cpu(hdr->frame_control);
613 u16 dur;
614 struct ieee80211_tx_control *control = tx->u.tx.control;
615 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
616
617 if (!control->retry_limit) {
618 if (!is_multicast_ether_addr(hdr->addr1)) {
619 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
620 && tx->local->rts_threshold <
621 IEEE80211_MAX_RTS_THRESHOLD) {
622 control->flags |=
623 IEEE80211_TXCTL_USE_RTS_CTS;
624 control->flags |=
625 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
626 control->retry_limit =
627 tx->local->long_retry_limit;
628 } else {
629 control->retry_limit =
630 tx->local->short_retry_limit;
631 }
632 } else {
633 control->retry_limit = 1;
634 }
635 }
636
637 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
638 /* Do not use multiple retry rates when sending fragmented
639 * frames.
640 * TODO: The last fragment could still use multiple retry
641 * rates. */
642 control->alt_retry_rate = -1;
643 }
644
645 /* Use CTS protection for unicast frames sent using extended rates if
646 * there are associated non-ERP stations and RTS/CTS is not configured
647 * for the frame. */
648 if (mode->mode == MODE_IEEE80211G &&
649 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
650 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
651 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
652 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
653 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
654
655 /* Transmit data frames using short preambles if the driver supports
656 * short preambles at the selected rate and short preambles are
657 * available on the network at the current point in time. */
658 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
659 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
660 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
661 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
662 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
663 }
664
665 /* Setup duration field for the first fragment of the frame. Duration
666 * for remaining fragments will be updated when they are being sent
667 * to low-level driver in ieee80211_tx(). */
668 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
669 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
670 tx->u.tx.extra_frag[0]->len : 0);
671 hdr->duration_id = cpu_to_le16(dur);
672
673 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
674 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
675 struct ieee80211_rate *rate;
676
677 /* Do not use multiple retry rates when using RTS/CTS */
678 control->alt_retry_rate = -1;
679
680 /* Use min(data rate, max base rate) as CTS/RTS rate */
681 rate = tx->u.tx.rate;
682 while (rate > mode->rates &&
683 !(rate->flags & IEEE80211_RATE_BASIC))
684 rate--;
685
686 control->rts_cts_rate = rate->val;
687 control->rts_rate = rate;
688 }
689
690 if (tx->sta) {
691 tx->sta->tx_packets++;
692 tx->sta->tx_fragments++;
693 tx->sta->tx_bytes += tx->skb->len;
694 if (tx->u.tx.extra_frag) {
695 int i;
696 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
697 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
698 tx->sta->tx_bytes +=
699 tx->u.tx.extra_frag[i]->len;
700 }
701 }
702 }
703
704 /*
705 * Tell hardware to not encrypt when we had sw crypto.
706 * Because we use the same flag to internally indicate that
707 * no (software) encryption should be done, we have to set it
708 * after all crypto handlers.
709 */
710 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
711 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
712
713 return TXRX_CONTINUE;
714 }
715
716 static ieee80211_txrx_result
717 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
718 {
719 struct ieee80211_local *local = tx->local;
720 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
721 struct sk_buff *skb = tx->skb;
722 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
723 u32 load = 0, hdrtime;
724
725 /* TODO: this could be part of tx_status handling, so that the number
726 * of retries would be known; TX rate should in that case be stored
727 * somewhere with the packet */
728
729 /* Estimate total channel use caused by this frame */
730
731 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
732 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
733
734 if (mode->mode == MODE_IEEE80211A ||
735 (mode->mode == MODE_IEEE80211G &&
736 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
737 hdrtime = CHAN_UTIL_HDR_SHORT;
738 else
739 hdrtime = CHAN_UTIL_HDR_LONG;
740
741 load = hdrtime;
742 if (!is_multicast_ether_addr(hdr->addr1))
743 load += hdrtime;
744
745 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
746 load += 2 * hdrtime;
747 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
748 load += hdrtime;
749
750 load += skb->len * tx->u.tx.rate->rate_inv;
751
752 if (tx->u.tx.extra_frag) {
753 int i;
754 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
755 load += 2 * hdrtime;
756 load += tx->u.tx.extra_frag[i]->len *
757 tx->u.tx.rate->rate;
758 }
759 }
760
761 /* Divide channel_use by 8 to avoid wrapping around the counter */
762 load >>= CHAN_UTIL_SHIFT;
763 local->channel_use_raw += load;
764 if (tx->sta)
765 tx->sta->channel_use_raw += load;
766 tx->sdata->channel_use_raw += load;
767
768 return TXRX_CONTINUE;
769 }
770
771 /* TODO: implement register/unregister functions for adding TX/RX handlers
772 * into ordered list */
773
774 ieee80211_tx_handler ieee80211_tx_handlers[] =
775 {
776 ieee80211_tx_h_check_assoc,
777 ieee80211_tx_h_sequence,
778 ieee80211_tx_h_ps_buf,
779 ieee80211_tx_h_select_key,
780 ieee80211_tx_h_michael_mic_add,
781 ieee80211_tx_h_fragment,
782 ieee80211_tx_h_encrypt,
783 ieee80211_tx_h_rate_ctrl,
784 ieee80211_tx_h_misc,
785 ieee80211_tx_h_load_stats,
786 NULL
787 };
788
789 /* actual transmit path */
790
791 /*
792 * deal with packet injection down monitor interface
793 * with Radiotap Header -- only called for monitor mode interface
794 */
795 static ieee80211_txrx_result
796 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
797 struct sk_buff *skb)
798 {
799 /*
800 * this is the moment to interpret and discard the radiotap header that
801 * must be at the start of the packet injected in Monitor mode
802 *
803 * Need to take some care with endian-ness since radiotap
804 * args are little-endian
805 */
806
807 struct ieee80211_radiotap_iterator iterator;
808 struct ieee80211_radiotap_header *rthdr =
809 (struct ieee80211_radiotap_header *) skb->data;
810 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
811 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
812 struct ieee80211_tx_control *control = tx->u.tx.control;
813
814 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
815 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
816 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
817
818 /*
819 * for every radiotap entry that is present
820 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
821 * entries present, or -EINVAL on error)
822 */
823
824 while (!ret) {
825 int i, target_rate;
826
827 ret = ieee80211_radiotap_iterator_next(&iterator);
828
829 if (ret)
830 continue;
831
832 /* see if this argument is something we can use */
833 switch (iterator.this_arg_index) {
834 /*
835 * You must take care when dereferencing iterator.this_arg
836 * for multibyte types... the pointer is not aligned. Use
837 * get_unaligned((type *)iterator.this_arg) to dereference
838 * iterator.this_arg for type "type" safely on all arches.
839 */
840 case IEEE80211_RADIOTAP_RATE:
841 /*
842 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
843 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
844 */
845 target_rate = (*iterator.this_arg) * 5;
846 for (i = 0; i < mode->num_rates; i++) {
847 struct ieee80211_rate *r = &mode->rates[i];
848
849 if (r->rate == target_rate) {
850 tx->u.tx.rate = r;
851 break;
852 }
853 }
854 break;
855
856 case IEEE80211_RADIOTAP_ANTENNA:
857 /*
858 * radiotap uses 0 for 1st ant, mac80211 is 1 for
859 * 1st ant
860 */
861 control->antenna_sel_tx = (*iterator.this_arg) + 1;
862 break;
863
864 case IEEE80211_RADIOTAP_DBM_TX_POWER:
865 control->power_level = *iterator.this_arg;
866 break;
867
868 case IEEE80211_RADIOTAP_FLAGS:
869 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
870 /*
871 * this indicates that the skb we have been
872 * handed has the 32-bit FCS CRC at the end...
873 * we should react to that by snipping it off
874 * because it will be recomputed and added
875 * on transmission
876 */
877 if (skb->len < (iterator.max_length + FCS_LEN))
878 return TXRX_DROP;
879
880 skb_trim(skb, skb->len - FCS_LEN);
881 }
882 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
883 control->flags &=
884 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
885 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
886 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
887 break;
888
889 /*
890 * Please update the file
891 * Documentation/networking/mac80211-injection.txt
892 * when parsing new fields here.
893 */
894
895 default:
896 break;
897 }
898 }
899
900 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
901 return TXRX_DROP;
902
903 /*
904 * remove the radiotap header
905 * iterator->max_length was sanity-checked against
906 * skb->len by iterator init
907 */
908 skb_pull(skb, iterator.max_length);
909
910 return TXRX_CONTINUE;
911 }
912
913 /*
914 * initialises @tx
915 */
916 static ieee80211_txrx_result
917 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
918 struct sk_buff *skb,
919 struct net_device *dev,
920 struct ieee80211_tx_control *control)
921 {
922 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
923 struct ieee80211_hdr *hdr;
924 struct ieee80211_sub_if_data *sdata;
925 ieee80211_txrx_result res = TXRX_CONTINUE;
926
927 int hdrlen;
928
929 memset(tx, 0, sizeof(*tx));
930 tx->skb = skb;
931 tx->dev = dev; /* use original interface */
932 tx->local = local;
933 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
934 tx->u.tx.control = control;
935 /*
936 * Set this flag (used below to indicate "automatic fragmentation"),
937 * it will be cleared/left by radiotap as desired.
938 */
939 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
940
941 /* process and remove the injection radiotap header */
942 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
943 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
944 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
945 return TXRX_DROP;
946
947 /*
948 * __ieee80211_parse_tx_radiotap has now removed
949 * the radiotap header that was present and pre-filled
950 * 'tx' with tx control information.
951 */
952 }
953
954 hdr = (struct ieee80211_hdr *) skb->data;
955
956 tx->sta = sta_info_get(local, hdr->addr1);
957 tx->fc = le16_to_cpu(hdr->frame_control);
958
959 if (is_multicast_ether_addr(hdr->addr1)) {
960 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
961 control->flags |= IEEE80211_TXCTL_NO_ACK;
962 } else {
963 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
964 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
965 }
966
967 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
968 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
969 skb->len + FCS_LEN > local->fragmentation_threshold &&
970 !local->ops->set_frag_threshold)
971 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
972 else
973 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
974 }
975
976 if (!tx->sta)
977 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
978 else if (tx->sta->clear_dst_mask) {
979 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
980 tx->sta->clear_dst_mask = 0;
981 }
982
983 hdrlen = ieee80211_get_hdrlen(tx->fc);
984 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
985 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
986 tx->ethertype = (pos[0] << 8) | pos[1];
987 }
988 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
989
990 return res;
991 }
992
993 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
994 * finished with it.
995 *
996 * NB: @tx is uninitialised when passed in here
997 */
998 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
999 struct sk_buff *skb,
1000 struct net_device *mdev,
1001 struct ieee80211_tx_control *control)
1002 {
1003 struct ieee80211_tx_packet_data *pkt_data;
1004 struct net_device *dev;
1005
1006 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1007 dev = dev_get_by_index(pkt_data->ifindex);
1008 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1009 dev_put(dev);
1010 dev = NULL;
1011 }
1012 if (unlikely(!dev))
1013 return -ENODEV;
1014 /* initialises tx with control */
1015 __ieee80211_tx_prepare(tx, skb, dev, control);
1016 return 0;
1017 }
1018
1019 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1020 struct ieee80211_txrx_data *tx)
1021 {
1022 struct ieee80211_tx_control *control = tx->u.tx.control;
1023 int ret, i;
1024
1025 if (!ieee80211_qdisc_installed(local->mdev) &&
1026 __ieee80211_queue_stopped(local, 0)) {
1027 netif_stop_queue(local->mdev);
1028 return IEEE80211_TX_AGAIN;
1029 }
1030 if (skb) {
1031 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1032 "TX to low-level driver", skb);
1033 ret = local->ops->tx(local_to_hw(local), skb, control);
1034 if (ret)
1035 return IEEE80211_TX_AGAIN;
1036 local->mdev->trans_start = jiffies;
1037 ieee80211_led_tx(local, 1);
1038 }
1039 if (tx->u.tx.extra_frag) {
1040 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1041 IEEE80211_TXCTL_USE_CTS_PROTECT |
1042 IEEE80211_TXCTL_CLEAR_DST_MASK |
1043 IEEE80211_TXCTL_FIRST_FRAGMENT);
1044 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1045 if (!tx->u.tx.extra_frag[i])
1046 continue;
1047 if (__ieee80211_queue_stopped(local, control->queue))
1048 return IEEE80211_TX_FRAG_AGAIN;
1049 if (i == tx->u.tx.num_extra_frag) {
1050 control->tx_rate = tx->u.tx.last_frag_hwrate;
1051 control->rate = tx->u.tx.last_frag_rate;
1052 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1053 control->flags |=
1054 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1055 else
1056 control->flags &=
1057 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1058 }
1059
1060 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1061 "TX to low-level driver",
1062 tx->u.tx.extra_frag[i]);
1063 ret = local->ops->tx(local_to_hw(local),
1064 tx->u.tx.extra_frag[i],
1065 control);
1066 if (ret)
1067 return IEEE80211_TX_FRAG_AGAIN;
1068 local->mdev->trans_start = jiffies;
1069 ieee80211_led_tx(local, 1);
1070 tx->u.tx.extra_frag[i] = NULL;
1071 }
1072 kfree(tx->u.tx.extra_frag);
1073 tx->u.tx.extra_frag = NULL;
1074 }
1075 return IEEE80211_TX_OK;
1076 }
1077
1078 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1079 struct ieee80211_tx_control *control)
1080 {
1081 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1082 struct sta_info *sta;
1083 ieee80211_tx_handler *handler;
1084 struct ieee80211_txrx_data tx;
1085 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1086 int ret, i;
1087
1088 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1089
1090 if (unlikely(skb->len < 10)) {
1091 dev_kfree_skb(skb);
1092 return 0;
1093 }
1094
1095 /* initialises tx */
1096 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1097
1098 if (res_prepare == TXRX_DROP) {
1099 dev_kfree_skb(skb);
1100 return 0;
1101 }
1102
1103 /*
1104 * key references are protected using RCU and this requires that
1105 * we are in a read-site RCU section during receive processing
1106 */
1107 rcu_read_lock();
1108
1109 sta = tx.sta;
1110 tx.u.tx.mode = local->hw.conf.mode;
1111
1112 for (handler = local->tx_handlers; *handler != NULL;
1113 handler++) {
1114 res = (*handler)(&tx);
1115 if (res != TXRX_CONTINUE)
1116 break;
1117 }
1118
1119 skb = tx.skb; /* handlers are allowed to change skb */
1120
1121 if (sta)
1122 sta_info_put(sta);
1123
1124 if (unlikely(res == TXRX_DROP)) {
1125 I802_DEBUG_INC(local->tx_handlers_drop);
1126 goto drop;
1127 }
1128
1129 if (unlikely(res == TXRX_QUEUED)) {
1130 I802_DEBUG_INC(local->tx_handlers_queued);
1131 rcu_read_unlock();
1132 return 0;
1133 }
1134
1135 if (tx.u.tx.extra_frag) {
1136 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1137 int next_len, dur;
1138 struct ieee80211_hdr *hdr =
1139 (struct ieee80211_hdr *)
1140 tx.u.tx.extra_frag[i]->data;
1141
1142 if (i + 1 < tx.u.tx.num_extra_frag) {
1143 next_len = tx.u.tx.extra_frag[i + 1]->len;
1144 } else {
1145 next_len = 0;
1146 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1147 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1148 }
1149 dur = ieee80211_duration(&tx, 0, next_len);
1150 hdr->duration_id = cpu_to_le16(dur);
1151 }
1152 }
1153
1154 retry:
1155 ret = __ieee80211_tx(local, skb, &tx);
1156 if (ret) {
1157 struct ieee80211_tx_stored_packet *store =
1158 &local->pending_packet[control->queue];
1159
1160 if (ret == IEEE80211_TX_FRAG_AGAIN)
1161 skb = NULL;
1162 set_bit(IEEE80211_LINK_STATE_PENDING,
1163 &local->state[control->queue]);
1164 smp_mb();
1165 /* When the driver gets out of buffers during sending of
1166 * fragments and calls ieee80211_stop_queue, there is
1167 * a small window between IEEE80211_LINK_STATE_XOFF and
1168 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1169 * gets available in that window (i.e. driver calls
1170 * ieee80211_wake_queue), we would end up with ieee80211_tx
1171 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1172 * continuing transmitting here when that situation is
1173 * possible to have happened. */
1174 if (!__ieee80211_queue_stopped(local, control->queue)) {
1175 clear_bit(IEEE80211_LINK_STATE_PENDING,
1176 &local->state[control->queue]);
1177 goto retry;
1178 }
1179 memcpy(&store->control, control,
1180 sizeof(struct ieee80211_tx_control));
1181 store->skb = skb;
1182 store->extra_frag = tx.u.tx.extra_frag;
1183 store->num_extra_frag = tx.u.tx.num_extra_frag;
1184 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1185 store->last_frag_rate = tx.u.tx.last_frag_rate;
1186 store->last_frag_rate_ctrl_probe =
1187 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1188 }
1189 rcu_read_unlock();
1190 return 0;
1191
1192 drop:
1193 if (skb)
1194 dev_kfree_skb(skb);
1195 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1196 if (tx.u.tx.extra_frag[i])
1197 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1198 kfree(tx.u.tx.extra_frag);
1199 rcu_read_unlock();
1200 return 0;
1201 }
1202
1203 /* device xmit handlers */
1204
1205 int ieee80211_master_start_xmit(struct sk_buff *skb,
1206 struct net_device *dev)
1207 {
1208 struct ieee80211_tx_control control;
1209 struct ieee80211_tx_packet_data *pkt_data;
1210 struct net_device *odev = NULL;
1211 struct ieee80211_sub_if_data *osdata;
1212 int headroom;
1213 int ret;
1214
1215 /*
1216 * copy control out of the skb so other people can use skb->cb
1217 */
1218 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1219 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1220
1221 if (pkt_data->ifindex)
1222 odev = dev_get_by_index(pkt_data->ifindex);
1223 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1224 dev_put(odev);
1225 odev = NULL;
1226 }
1227 if (unlikely(!odev)) {
1228 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1229 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1230 "originating device\n", dev->name);
1231 #endif
1232 dev_kfree_skb(skb);
1233 return 0;
1234 }
1235 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1236
1237 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1238 if (skb_headroom(skb) < headroom) {
1239 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1240 dev_kfree_skb(skb);
1241 dev_put(odev);
1242 return 0;
1243 }
1244 }
1245
1246 control.ifindex = odev->ifindex;
1247 control.type = osdata->type;
1248 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1249 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1250 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1251 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1252 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1253 control.flags |= IEEE80211_TXCTL_REQUEUE;
1254 control.queue = pkt_data->queue;
1255
1256 ret = ieee80211_tx(odev, skb, &control);
1257 dev_put(odev);
1258
1259 return ret;
1260 }
1261
1262 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1263 struct net_device *dev)
1264 {
1265 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1266 struct ieee80211_tx_packet_data *pkt_data;
1267 struct ieee80211_radiotap_header *prthdr =
1268 (struct ieee80211_radiotap_header *)skb->data;
1269 u16 len_rthdr;
1270
1271 /* check for not even having the fixed radiotap header part */
1272 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1273 goto fail; /* too short to be possibly valid */
1274
1275 /* is it a header version we can trust to find length from? */
1276 if (unlikely(prthdr->it_version))
1277 goto fail; /* only version 0 is supported */
1278
1279 /* then there must be a radiotap header with a length we can use */
1280 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1281
1282 /* does the skb contain enough to deliver on the alleged length? */
1283 if (unlikely(skb->len < len_rthdr))
1284 goto fail; /* skb too short for claimed rt header extent */
1285
1286 skb->dev = local->mdev;
1287
1288 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1289 memset(pkt_data, 0, sizeof(*pkt_data));
1290 /* needed because we set skb device to master */
1291 pkt_data->ifindex = dev->ifindex;
1292
1293 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1294
1295 /*
1296 * fix up the pointers accounting for the radiotap
1297 * header still being in there. We are being given
1298 * a precooked IEEE80211 header so no need for
1299 * normal processing
1300 */
1301 skb_set_mac_header(skb, len_rthdr);
1302 /*
1303 * these are just fixed to the end of the rt area since we
1304 * don't have any better information and at this point, nobody cares
1305 */
1306 skb_set_network_header(skb, len_rthdr);
1307 skb_set_transport_header(skb, len_rthdr);
1308
1309 /* pass the radiotap header up to the next stage intact */
1310 dev_queue_xmit(skb);
1311 return NETDEV_TX_OK;
1312
1313 fail:
1314 dev_kfree_skb(skb);
1315 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1316 }
1317
1318 /**
1319 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1320 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1321 * @skb: packet to be sent
1322 * @dev: incoming interface
1323 *
1324 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1325 * not be freed, and caller is responsible for either retrying later or freeing
1326 * skb).
1327 *
1328 * This function takes in an Ethernet header and encapsulates it with suitable
1329 * IEEE 802.11 header based on which interface the packet is coming in. The
1330 * encapsulated packet will then be passed to master interface, wlan#.11, for
1331 * transmission (through low-level driver).
1332 */
1333 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1334 struct net_device *dev)
1335 {
1336 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1337 struct ieee80211_tx_packet_data *pkt_data;
1338 struct ieee80211_sub_if_data *sdata;
1339 int ret = 1, head_need;
1340 u16 ethertype, hdrlen, fc;
1341 struct ieee80211_hdr hdr;
1342 const u8 *encaps_data;
1343 int encaps_len, skip_header_bytes;
1344 int nh_pos, h_pos;
1345 struct sta_info *sta;
1346
1347 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1348 if (unlikely(skb->len < ETH_HLEN)) {
1349 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1350 dev->name, skb->len);
1351 ret = 0;
1352 goto fail;
1353 }
1354
1355 nh_pos = skb_network_header(skb) - skb->data;
1356 h_pos = skb_transport_header(skb) - skb->data;
1357
1358 /* convert Ethernet header to proper 802.11 header (based on
1359 * operation mode) */
1360 ethertype = (skb->data[12] << 8) | skb->data[13];
1361 /* TODO: handling for 802.1x authorized/unauthorized port */
1362 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1363
1364 switch (sdata->type) {
1365 case IEEE80211_IF_TYPE_AP:
1366 case IEEE80211_IF_TYPE_VLAN:
1367 fc |= IEEE80211_FCTL_FROMDS;
1368 /* DA BSSID SA */
1369 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1370 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1371 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1372 hdrlen = 24;
1373 break;
1374 case IEEE80211_IF_TYPE_WDS:
1375 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1376 /* RA TA DA SA */
1377 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1378 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1379 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1380 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1381 hdrlen = 30;
1382 break;
1383 case IEEE80211_IF_TYPE_STA:
1384 fc |= IEEE80211_FCTL_TODS;
1385 /* BSSID SA DA */
1386 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1387 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1388 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1389 hdrlen = 24;
1390 break;
1391 case IEEE80211_IF_TYPE_IBSS:
1392 /* DA SA BSSID */
1393 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1394 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1395 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1396 hdrlen = 24;
1397 break;
1398 default:
1399 ret = 0;
1400 goto fail;
1401 }
1402
1403 /* receiver is QoS enabled, use a QoS type frame */
1404 sta = sta_info_get(local, hdr.addr1);
1405 if (sta) {
1406 if (sta->flags & WLAN_STA_WME) {
1407 fc |= IEEE80211_STYPE_QOS_DATA;
1408 hdrlen += 2;
1409 }
1410 sta_info_put(sta);
1411 }
1412
1413 hdr.frame_control = cpu_to_le16(fc);
1414 hdr.duration_id = 0;
1415 hdr.seq_ctrl = 0;
1416
1417 skip_header_bytes = ETH_HLEN;
1418 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1419 encaps_data = bridge_tunnel_header;
1420 encaps_len = sizeof(bridge_tunnel_header);
1421 skip_header_bytes -= 2;
1422 } else if (ethertype >= 0x600) {
1423 encaps_data = rfc1042_header;
1424 encaps_len = sizeof(rfc1042_header);
1425 skip_header_bytes -= 2;
1426 } else {
1427 encaps_data = NULL;
1428 encaps_len = 0;
1429 }
1430
1431 skb_pull(skb, skip_header_bytes);
1432 nh_pos -= skip_header_bytes;
1433 h_pos -= skip_header_bytes;
1434
1435 /* TODO: implement support for fragments so that there is no need to
1436 * reallocate and copy payload; it might be enough to support one
1437 * extra fragment that would be copied in the beginning of the frame
1438 * data.. anyway, it would be nice to include this into skb structure
1439 * somehow
1440 *
1441 * There are few options for this:
1442 * use skb->cb as an extra space for 802.11 header
1443 * allocate new buffer if not enough headroom
1444 * make sure that there is enough headroom in every skb by increasing
1445 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1446 * alloc_skb() (net/core/skbuff.c)
1447 */
1448 head_need = hdrlen + encaps_len + local->tx_headroom;
1449 head_need -= skb_headroom(skb);
1450
1451 /* We are going to modify skb data, so make a copy of it if happens to
1452 * be cloned. This could happen, e.g., with Linux bridge code passing
1453 * us broadcast frames. */
1454
1455 if (head_need > 0 || skb_cloned(skb)) {
1456 #if 0
1457 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1458 "of headroom\n", dev->name, head_need);
1459 #endif
1460
1461 if (skb_cloned(skb))
1462 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1463 else
1464 I802_DEBUG_INC(local->tx_expand_skb_head);
1465 /* Since we have to reallocate the buffer, make sure that there
1466 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1467 * before payload and 12 after). */
1468 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1469 12, GFP_ATOMIC)) {
1470 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1471 "\n", dev->name);
1472 goto fail;
1473 }
1474 }
1475
1476 if (encaps_data) {
1477 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1478 nh_pos += encaps_len;
1479 h_pos += encaps_len;
1480 }
1481
1482 if (fc & IEEE80211_STYPE_QOS_DATA) {
1483 __le16 *qos_control;
1484
1485 qos_control = (__le16*) skb_push(skb, 2);
1486 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1487 /*
1488 * Maybe we could actually set some fields here, for now just
1489 * initialise to zero to indicate no special operation.
1490 */
1491 *qos_control = 0;
1492 } else
1493 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1494
1495 nh_pos += hdrlen;
1496 h_pos += hdrlen;
1497
1498 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1499 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1500 pkt_data->ifindex = dev->ifindex;
1501
1502 skb->dev = local->mdev;
1503 dev->stats.tx_packets++;
1504 dev->stats.tx_bytes += skb->len;
1505
1506 /* Update skb pointers to various headers since this modified frame
1507 * is going to go through Linux networking code that may potentially
1508 * need things like pointer to IP header. */
1509 skb_set_mac_header(skb, 0);
1510 skb_set_network_header(skb, nh_pos);
1511 skb_set_transport_header(skb, h_pos);
1512
1513 dev->trans_start = jiffies;
1514 dev_queue_xmit(skb);
1515
1516 return 0;
1517
1518 fail:
1519 if (!ret)
1520 dev_kfree_skb(skb);
1521
1522 return ret;
1523 }
1524
1525 /*
1526 * This is the transmit routine for the 802.11 type interfaces
1527 * called by upper layers of the linux networking
1528 * stack when it has a frame to transmit
1529 */
1530 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1531 {
1532 struct ieee80211_sub_if_data *sdata;
1533 struct ieee80211_tx_packet_data *pkt_data;
1534 struct ieee80211_hdr *hdr;
1535 u16 fc;
1536
1537 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1538
1539 if (skb->len < 10) {
1540 dev_kfree_skb(skb);
1541 return 0;
1542 }
1543
1544 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1545 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1546 0, GFP_ATOMIC)) {
1547 dev_kfree_skb(skb);
1548 return 0;
1549 }
1550 }
1551
1552 hdr = (struct ieee80211_hdr *) skb->data;
1553 fc = le16_to_cpu(hdr->frame_control);
1554
1555 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1556 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1557 pkt_data->ifindex = sdata->dev->ifindex;
1558
1559 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1560 skb->dev = sdata->local->mdev;
1561
1562 /*
1563 * We're using the protocol field of the the frame control header
1564 * to request TX callback for hostapd. BIT(1) is checked.
1565 */
1566 if ((fc & BIT(1)) == BIT(1)) {
1567 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1568 fc &= ~BIT(1);
1569 hdr->frame_control = cpu_to_le16(fc);
1570 }
1571
1572 if (!(fc & IEEE80211_FCTL_PROTECTED))
1573 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1574
1575 dev->stats.tx_packets++;
1576 dev->stats.tx_bytes += skb->len;
1577
1578 dev_queue_xmit(skb);
1579
1580 return 0;
1581 }
1582
1583 /* helper functions for pending packets for when queues are stopped */
1584
1585 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1586 {
1587 int i, j;
1588 struct ieee80211_tx_stored_packet *store;
1589
1590 for (i = 0; i < local->hw.queues; i++) {
1591 if (!__ieee80211_queue_pending(local, i))
1592 continue;
1593 store = &local->pending_packet[i];
1594 kfree_skb(store->skb);
1595 for (j = 0; j < store->num_extra_frag; j++)
1596 kfree_skb(store->extra_frag[j]);
1597 kfree(store->extra_frag);
1598 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1599 }
1600 }
1601
1602 void ieee80211_tx_pending(unsigned long data)
1603 {
1604 struct ieee80211_local *local = (struct ieee80211_local *)data;
1605 struct net_device *dev = local->mdev;
1606 struct ieee80211_tx_stored_packet *store;
1607 struct ieee80211_txrx_data tx;
1608 int i, ret, reschedule = 0;
1609
1610 netif_tx_lock_bh(dev);
1611 for (i = 0; i < local->hw.queues; i++) {
1612 if (__ieee80211_queue_stopped(local, i))
1613 continue;
1614 if (!__ieee80211_queue_pending(local, i)) {
1615 reschedule = 1;
1616 continue;
1617 }
1618 store = &local->pending_packet[i];
1619 tx.u.tx.control = &store->control;
1620 tx.u.tx.extra_frag = store->extra_frag;
1621 tx.u.tx.num_extra_frag = store->num_extra_frag;
1622 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1623 tx.u.tx.last_frag_rate = store->last_frag_rate;
1624 tx.flags = 0;
1625 if (store->last_frag_rate_ctrl_probe)
1626 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1627 ret = __ieee80211_tx(local, store->skb, &tx);
1628 if (ret) {
1629 if (ret == IEEE80211_TX_FRAG_AGAIN)
1630 store->skb = NULL;
1631 } else {
1632 clear_bit(IEEE80211_LINK_STATE_PENDING,
1633 &local->state[i]);
1634 reschedule = 1;
1635 }
1636 }
1637 netif_tx_unlock_bh(dev);
1638 if (reschedule) {
1639 if (!ieee80211_qdisc_installed(dev)) {
1640 if (!__ieee80211_queue_stopped(local, 0))
1641 netif_wake_queue(dev);
1642 } else
1643 netif_schedule(dev);
1644 }
1645 }
1646
1647 /* functions for drivers to get certain frames */
1648
1649 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1650 struct ieee80211_if_ap *bss,
1651 struct sk_buff *skb)
1652 {
1653 u8 *pos, *tim;
1654 int aid0 = 0;
1655 int i, have_bits = 0, n1, n2;
1656
1657 /* Generate bitmap for TIM only if there are any STAs in power save
1658 * mode. */
1659 read_lock_bh(&local->sta_lock);
1660 if (atomic_read(&bss->num_sta_ps) > 0)
1661 /* in the hope that this is faster than
1662 * checking byte-for-byte */
1663 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1664 IEEE80211_MAX_AID+1);
1665
1666 if (bss->dtim_count == 0)
1667 bss->dtim_count = bss->dtim_period - 1;
1668 else
1669 bss->dtim_count--;
1670
1671 tim = pos = (u8 *) skb_put(skb, 6);
1672 *pos++ = WLAN_EID_TIM;
1673 *pos++ = 4;
1674 *pos++ = bss->dtim_count;
1675 *pos++ = bss->dtim_period;
1676
1677 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1678 aid0 = 1;
1679
1680 if (have_bits) {
1681 /* Find largest even number N1 so that bits numbered 1 through
1682 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1683 * (N2 + 1) x 8 through 2007 are 0. */
1684 n1 = 0;
1685 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1686 if (bss->tim[i]) {
1687 n1 = i & 0xfe;
1688 break;
1689 }
1690 }
1691 n2 = n1;
1692 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1693 if (bss->tim[i]) {
1694 n2 = i;
1695 break;
1696 }
1697 }
1698
1699 /* Bitmap control */
1700 *pos++ = n1 | aid0;
1701 /* Part Virt Bitmap */
1702 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1703
1704 tim[1] = n2 - n1 + 4;
1705 skb_put(skb, n2 - n1);
1706 } else {
1707 *pos++ = aid0; /* Bitmap control */
1708 *pos++ = 0; /* Part Virt Bitmap */
1709 }
1710 read_unlock_bh(&local->sta_lock);
1711 }
1712
1713 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1714 struct ieee80211_tx_control *control)
1715 {
1716 struct ieee80211_local *local = hw_to_local(hw);
1717 struct sk_buff *skb;
1718 struct net_device *bdev;
1719 struct ieee80211_sub_if_data *sdata = NULL;
1720 struct ieee80211_if_ap *ap = NULL;
1721 struct ieee80211_rate *rate;
1722 struct rate_control_extra extra;
1723 u8 *b_head, *b_tail;
1724 int bh_len, bt_len;
1725
1726 bdev = dev_get_by_index(if_id);
1727 if (bdev) {
1728 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1729 ap = &sdata->u.ap;
1730 dev_put(bdev);
1731 }
1732
1733 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1734 !ap->beacon_head) {
1735 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1736 if (net_ratelimit())
1737 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1738 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1739 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1740 return NULL;
1741 }
1742
1743 /* Assume we are generating the normal beacon locally */
1744 b_head = ap->beacon_head;
1745 b_tail = ap->beacon_tail;
1746 bh_len = ap->beacon_head_len;
1747 bt_len = ap->beacon_tail_len;
1748
1749 skb = dev_alloc_skb(local->tx_headroom +
1750 bh_len + bt_len + 256 /* maximum TIM len */);
1751 if (!skb)
1752 return NULL;
1753
1754 skb_reserve(skb, local->tx_headroom);
1755 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1756
1757 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1758
1759 ieee80211_beacon_add_tim(local, ap, skb);
1760
1761 if (b_tail) {
1762 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1763 }
1764
1765 if (control) {
1766 memset(&extra, 0, sizeof(extra));
1767 extra.mode = local->oper_hw_mode;
1768
1769 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1770 if (!rate) {
1771 if (net_ratelimit()) {
1772 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1773 "found\n", wiphy_name(local->hw.wiphy));
1774 }
1775 dev_kfree_skb(skb);
1776 return NULL;
1777 }
1778
1779 control->tx_rate =
1780 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1781 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1782 rate->val2 : rate->val;
1783 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1784 control->power_level = local->hw.conf.power_level;
1785 control->flags |= IEEE80211_TXCTL_NO_ACK;
1786 control->retry_limit = 1;
1787 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1788 }
1789
1790 ap->num_beacons++;
1791 return skb;
1792 }
1793 EXPORT_SYMBOL(ieee80211_beacon_get);
1794
1795 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1796 const void *frame, size_t frame_len,
1797 const struct ieee80211_tx_control *frame_txctl,
1798 struct ieee80211_rts *rts)
1799 {
1800 const struct ieee80211_hdr *hdr = frame;
1801 u16 fctl;
1802
1803 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1804 rts->frame_control = cpu_to_le16(fctl);
1805 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1806 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1807 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1808 }
1809 EXPORT_SYMBOL(ieee80211_rts_get);
1810
1811 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1812 const void *frame, size_t frame_len,
1813 const struct ieee80211_tx_control *frame_txctl,
1814 struct ieee80211_cts *cts)
1815 {
1816 const struct ieee80211_hdr *hdr = frame;
1817 u16 fctl;
1818
1819 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1820 cts->frame_control = cpu_to_le16(fctl);
1821 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1822 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1823 }
1824 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1825
1826 struct sk_buff *
1827 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1828 struct ieee80211_tx_control *control)
1829 {
1830 struct ieee80211_local *local = hw_to_local(hw);
1831 struct sk_buff *skb;
1832 struct sta_info *sta;
1833 ieee80211_tx_handler *handler;
1834 struct ieee80211_txrx_data tx;
1835 ieee80211_txrx_result res = TXRX_DROP;
1836 struct net_device *bdev;
1837 struct ieee80211_sub_if_data *sdata;
1838 struct ieee80211_if_ap *bss = NULL;
1839
1840 bdev = dev_get_by_index(if_id);
1841 if (bdev) {
1842 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1843 bss = &sdata->u.ap;
1844 dev_put(bdev);
1845 }
1846 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1847 return NULL;
1848
1849 if (bss->dtim_count != 0)
1850 return NULL; /* send buffered bc/mc only after DTIM beacon */
1851 memset(control, 0, sizeof(*control));
1852 while (1) {
1853 skb = skb_dequeue(&bss->ps_bc_buf);
1854 if (!skb)
1855 return NULL;
1856 local->total_ps_buffered--;
1857
1858 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1859 struct ieee80211_hdr *hdr =
1860 (struct ieee80211_hdr *) skb->data;
1861 /* more buffered multicast/broadcast frames ==> set
1862 * MoreData flag in IEEE 802.11 header to inform PS
1863 * STAs */
1864 hdr->frame_control |=
1865 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1866 }
1867
1868 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1869 break;
1870 dev_kfree_skb_any(skb);
1871 }
1872 sta = tx.sta;
1873 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1874 tx.u.tx.mode = local->hw.conf.mode;
1875
1876 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1877 res = (*handler)(&tx);
1878 if (res == TXRX_DROP || res == TXRX_QUEUED)
1879 break;
1880 }
1881 dev_put(tx.dev);
1882 skb = tx.skb; /* handlers are allowed to change skb */
1883
1884 if (res == TXRX_DROP) {
1885 I802_DEBUG_INC(local->tx_handlers_drop);
1886 dev_kfree_skb(skb);
1887 skb = NULL;
1888 } else if (res == TXRX_QUEUED) {
1889 I802_DEBUG_INC(local->tx_handlers_queued);
1890 skb = NULL;
1891 }
1892
1893 if (sta)
1894 sta_info_put(sta);
1895
1896 return skb;
1897 }
1898 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
OpenWrt Source Repository