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[PATCH] mac80211: consolidate encryption
[linux-2.6/mini2440.git] / net / mac80211 / tx.c
blob54e05392410d040b3a3112ba8297df0174b46306
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "ieee80211_led.h"
29 #include "wep.h"
30 #include "wpa.h"
31 #include "wme.h"
32 #include "ieee80211_rate.h"
33
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
37
38 /* misc utils */
39
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_hdr *hdr)
42 {
43 /* Set the sequence number for this frame. */
44 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
45
46 /* Increase the sequence number. */
47 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
48 }
49
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname, const char *title,
52 const struct sk_buff *skb)
53 {
54 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
55 u16 fc;
56 int hdrlen;
57 DECLARE_MAC_BUF(mac);
58
59 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
60 if (skb->len < 4) {
61 printk("\n");
62 return;
63 }
64
65 fc = le16_to_cpu(hdr->frame_control);
66 hdrlen = ieee80211_get_hdrlen(fc);
67 if (hdrlen > skb->len)
68 hdrlen = skb->len;
69 if (hdrlen >= 4)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc, le16_to_cpu(hdr->duration_id));
72 if (hdrlen >= 10)
73 printk(" A1=%s", print_mac(mac, hdr->addr1));
74 if (hdrlen >= 16)
75 printk(" A2=%s", print_mac(mac, hdr->addr2));
76 if (hdrlen >= 24)
77 printk(" A3=%s", print_mac(mac, hdr->addr3));
78 if (hdrlen >= 30)
79 printk(" A4=%s", print_mac(mac, hdr->addr4));
80 printk("\n");
81 }
82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
84 struct sk_buff *skb)
85 {
86 }
87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
88
89 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
90 int next_frag_len)
91 {
92 int rate, mrate, erp, dur, i;
93 struct ieee80211_rate *txrate = tx->u.tx.rate;
94 struct ieee80211_local *local = tx->local;
95 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
96
97 erp = txrate->flags & IEEE80211_RATE_ERP;
98
99 /*
100 * data and mgmt (except PS Poll):
101 * - during CFP: 32768
102 * - during contention period:
103 * if addr1 is group address: 0
104 * if more fragments = 0 and addr1 is individual address: time to
105 * transmit one ACK plus SIFS
106 * if more fragments = 1 and addr1 is individual address: time to
107 * transmit next fragment plus 2 x ACK plus 3 x SIFS
108 *
109 * IEEE 802.11, 9.6:
110 * - control response frame (CTS or ACK) shall be transmitted using the
111 * same rate as the immediately previous frame in the frame exchange
112 * sequence, if this rate belongs to the PHY mandatory rates, or else
113 * at the highest possible rate belonging to the PHY rates in the
114 * BSSBasicRateSet
115 */
116
117 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
118 /* TODO: These control frames are not currently sent by
119 * 80211.o, but should they be implemented, this function
120 * needs to be updated to support duration field calculation.
121 *
122 * RTS: time needed to transmit pending data/mgmt frame plus
123 * one CTS frame plus one ACK frame plus 3 x SIFS
124 * CTS: duration of immediately previous RTS minus time
125 * required to transmit CTS and its SIFS
126 * ACK: 0 if immediately previous directed data/mgmt had
127 * more=0, with more=1 duration in ACK frame is duration
128 * from previous frame minus time needed to transmit ACK
129 * and its SIFS
130 * PS Poll: BIT(15) | BIT(14) | aid
131 */
132 return 0;
133 }
134
135 /* data/mgmt */
136 if (0 /* FIX: data/mgmt during CFP */)
137 return 32768;
138
139 if (group_addr) /* Group address as the destination - no ACK */
140 return 0;
141
142 /* Individual destination address:
143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
144 * CTS and ACK frames shall be transmitted using the highest rate in
145 * basic rate set that is less than or equal to the rate of the
146 * immediately previous frame and that is using the same modulation
147 * (CCK or OFDM). If no basic rate set matches with these requirements,
148 * the highest mandatory rate of the PHY that is less than or equal to
149 * the rate of the previous frame is used.
150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
151 */
152 rate = -1;
153 mrate = 10; /* use 1 Mbps if everything fails */
154 for (i = 0; i < mode->num_rates; i++) {
155 struct ieee80211_rate *r = &mode->rates[i];
156 if (r->rate > txrate->rate)
157 break;
158
159 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
160 IEEE80211_RATE_MODULATION(r->flags))
161 continue;
162
163 if (r->flags & IEEE80211_RATE_BASIC)
164 rate = r->rate;
165 else if (r->flags & IEEE80211_RATE_MANDATORY)
166 mrate = r->rate;
167 }
168 if (rate == -1) {
169 /* No matching basic rate found; use highest suitable mandatory
170 * PHY rate */
171 rate = mrate;
172 }
173
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
177
178 dur = ieee80211_frame_duration(local, 10, rate, erp,
179 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
180
181 if (next_frag_len) {
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
185 /* next fragment */
186 dur += ieee80211_frame_duration(local, next_frag_len,
187 txrate->rate, erp,
188 tx->sdata->flags &
189 IEEE80211_SDATA_SHORT_PREAMBLE);
190 }
191
192 return dur;
193 }
194
195 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
196 int queue)
197 {
198 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
199 }
200
201 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
202 int queue)
203 {
204 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
205 }
206
207 static int inline is_ieee80211_device(struct net_device *dev,
208 struct net_device *master)
209 {
210 return (wdev_priv(dev->ieee80211_ptr) ==
211 wdev_priv(master->ieee80211_ptr));
212 }
213
214 /* tx handlers */
215
216 static ieee80211_txrx_result
217 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
218 {
219 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
220 struct sk_buff *skb = tx->skb;
221 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
222 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
223 u32 sta_flags;
224
225 if (unlikely(tx->local->sta_scanning != 0) &&
226 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
227 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
228 return TXRX_DROP;
229
230 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
231 return TXRX_CONTINUE;
232
233 sta_flags = tx->sta ? tx->sta->flags : 0;
234
235 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
236 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
237 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
238 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
239 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
240 DECLARE_MAC_BUF(mac);
241 printk(KERN_DEBUG "%s: dropped data frame to not "
242 "associated station %s\n",
243 tx->dev->name, print_mac(mac, 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(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
262 !(sta_flags & WLAN_STA_AUTHORIZED))) {
263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
264 DECLARE_MAC_BUF(mac);
265 printk(KERN_DEBUG "%s: dropped frame to %s"
266 " (unauthorized port)\n", tx->dev->name,
267 print_mac(mac, hdr->addr1));
268 #endif
269 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
270 return TXRX_DROP;
271 }
272
273 return TXRX_CONTINUE;
274 }
275
276 static ieee80211_txrx_result
277 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
278 {
279 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
280
281 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
282 ieee80211_include_sequence(tx->sdata, hdr);
283
284 return TXRX_CONTINUE;
285 }
286
287 /* This function is called whenever the AP is about to exceed the maximum limit
288 * of buffered frames for power saving STAs. This situation should not really
289 * happen often during normal operation, so dropping the oldest buffered packet
290 * from each queue should be OK to make some room for new frames. */
291 static void purge_old_ps_buffers(struct ieee80211_local *local)
292 {
293 int total = 0, purged = 0;
294 struct sk_buff *skb;
295 struct ieee80211_sub_if_data *sdata;
296 struct sta_info *sta;
297
298 /*
299 * virtual interfaces are protected by RCU
300 */
301 rcu_read_lock();
302
303 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
304 struct ieee80211_if_ap *ap;
305 if (sdata->dev == local->mdev ||
306 sdata->type != IEEE80211_IF_TYPE_AP)
307 continue;
308 ap = &sdata->u.ap;
309 skb = skb_dequeue(&ap->ps_bc_buf);
310 if (skb) {
311 purged++;
312 dev_kfree_skb(skb);
313 }
314 total += skb_queue_len(&ap->ps_bc_buf);
315 }
316 rcu_read_unlock();
317
318 read_lock_bh(&local->sta_lock);
319 list_for_each_entry(sta, &local->sta_list, list) {
320 skb = skb_dequeue(&sta->ps_tx_buf);
321 if (skb) {
322 purged++;
323 dev_kfree_skb(skb);
324 }
325 total += skb_queue_len(&sta->ps_tx_buf);
326 }
327 read_unlock_bh(&local->sta_lock);
328
329 local->total_ps_buffered = total;
330 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
331 wiphy_name(local->hw.wiphy), purged);
332 }
333
334 static inline ieee80211_txrx_result
335 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
336 {
337 /* broadcast/multicast frame */
338 /* If any of the associated stations is in power save mode,
339 * the frame is buffered to be sent after DTIM beacon frame */
340 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
341 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
342 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
343 !(tx->fc & IEEE80211_FCTL_ORDER)) {
344 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
345 purge_old_ps_buffers(tx->local);
346 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
347 AP_MAX_BC_BUFFER) {
348 if (net_ratelimit()) {
349 printk(KERN_DEBUG "%s: BC TX buffer full - "
350 "dropping the oldest frame\n",
351 tx->dev->name);
352 }
353 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
354 } else
355 tx->local->total_ps_buffered++;
356 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
357 return TXRX_QUEUED;
358 }
359
360 return TXRX_CONTINUE;
361 }
362
363 static inline ieee80211_txrx_result
364 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
365 {
366 struct sta_info *sta = tx->sta;
367 DECLARE_MAC_BUF(mac);
368
369 if (unlikely(!sta ||
370 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
371 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
372 return TXRX_CONTINUE;
373
374 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
375 struct ieee80211_tx_packet_data *pkt_data;
376 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
377 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
378 "before %d)\n",
379 print_mac(mac, sta->addr), sta->aid,
380 skb_queue_len(&sta->ps_tx_buf));
381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
382 sta->flags |= WLAN_STA_TIM;
383 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
384 purge_old_ps_buffers(tx->local);
385 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
386 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
387 if (net_ratelimit()) {
388 printk(KERN_DEBUG "%s: STA %s TX "
389 "buffer full - dropping oldest frame\n",
390 tx->dev->name, print_mac(mac, sta->addr));
391 }
392 dev_kfree_skb(old);
393 } else
394 tx->local->total_ps_buffered++;
395 /* Queue frame to be sent after STA sends an PS Poll frame */
396 if (skb_queue_empty(&sta->ps_tx_buf)) {
397 if (tx->local->ops->set_tim)
398 tx->local->ops->set_tim(local_to_hw(tx->local),
399 sta->aid, 1);
400 if (tx->sdata->bss)
401 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
402 }
403 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
404 pkt_data->jiffies = jiffies;
405 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
406 return TXRX_QUEUED;
407 }
408 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
409 else if (unlikely(sta->flags & WLAN_STA_PS)) {
410 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
411 "set -> send frame\n", tx->dev->name,
412 print_mac(mac, sta->addr));
413 }
414 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
415 sta->pspoll = 0;
416
417 return TXRX_CONTINUE;
418 }
419
420
421 static ieee80211_txrx_result
422 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
423 {
424 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
425 return TXRX_CONTINUE;
426
427 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
428 return ieee80211_tx_h_unicast_ps_buf(tx);
429 else
430 return ieee80211_tx_h_multicast_ps_buf(tx);
431 }
432
433
434
435
436 static ieee80211_txrx_result
437 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
438 {
439 struct ieee80211_key *key;
440
441 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
442 tx->key = NULL;
443 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
444 tx->key = key;
445 else if ((key = rcu_dereference(tx->sdata->default_key)))
446 tx->key = key;
447 else if (tx->sdata->drop_unencrypted &&
448 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
449 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
450 return TXRX_DROP;
451 } else {
452 tx->key = NULL;
453 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
454 }
455
456 if (tx->key) {
457 tx->key->tx_rx_count++;
458 /* TODO: add threshold stuff again */
459 }
460
461 return TXRX_CONTINUE;
462 }
463
464 static ieee80211_txrx_result
465 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
466 {
467 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
468 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
469 struct sk_buff **frags, *first, *frag;
470 int i;
471 u16 seq;
472 u8 *pos;
473 int frag_threshold = tx->local->fragmentation_threshold;
474
475 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
476 return TXRX_CONTINUE;
477
478 first = tx->skb;
479
480 hdrlen = ieee80211_get_hdrlen(tx->fc);
481 payload_len = first->len - hdrlen;
482 per_fragm = frag_threshold - hdrlen - FCS_LEN;
483 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
484
485 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
486 if (!frags)
487 goto fail;
488
489 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
490 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
491 pos = first->data + hdrlen + per_fragm;
492 left = payload_len - per_fragm;
493 for (i = 0; i < num_fragm - 1; i++) {
494 struct ieee80211_hdr *fhdr;
495 size_t copylen;
496
497 if (left <= 0)
498 goto fail;
499
500 /* reserve enough extra head and tail room for possible
501 * encryption */
502 frag = frags[i] =
503 dev_alloc_skb(tx->local->tx_headroom +
504 frag_threshold +
505 IEEE80211_ENCRYPT_HEADROOM +
506 IEEE80211_ENCRYPT_TAILROOM);
507 if (!frag)
508 goto fail;
509 /* Make sure that all fragments use the same priority so
510 * that they end up using the same TX queue */
511 frag->priority = first->priority;
512 skb_reserve(frag, tx->local->tx_headroom +
513 IEEE80211_ENCRYPT_HEADROOM);
514 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
515 memcpy(fhdr, first->data, hdrlen);
516 if (i == num_fragm - 2)
517 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
518 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
519 copylen = left > per_fragm ? per_fragm : left;
520 memcpy(skb_put(frag, copylen), pos, copylen);
521
522 pos += copylen;
523 left -= copylen;
524 }
525 skb_trim(first, hdrlen + per_fragm);
526
527 tx->u.tx.num_extra_frag = num_fragm - 1;
528 tx->u.tx.extra_frag = frags;
529
530 return TXRX_CONTINUE;
531
532 fail:
533 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
534 if (frags) {
535 for (i = 0; i < num_fragm - 1; i++)
536 if (frags[i])
537 dev_kfree_skb(frags[i]);
538 kfree(frags);
539 }
540 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
541 return TXRX_DROP;
542 }
543
544 static ieee80211_txrx_result
545 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
546 {
547 if (!tx->key)
548 return TXRX_CONTINUE;
549
550 switch (tx->key->conf.alg) {
551 case ALG_WEP:
552 return ieee80211_crypto_wep_encrypt(tx);
553 case ALG_TKIP:
554 return ieee80211_crypto_tkip_encrypt(tx);
555 case ALG_CCMP:
556 return ieee80211_crypto_ccmp_encrypt(tx);
557 case ALG_NONE:
558 return TXRX_CONTINUE;
559 }
560
561 /* not reached */
562 WARN_ON(1);
563 return TXRX_DROP;
564 }
565
566 static ieee80211_txrx_result
567 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
568 {
569 struct rate_control_extra extra;
570
571 memset(&extra, 0, sizeof(extra));
572 extra.mode = tx->u.tx.mode;
573 extra.mgmt_data = tx->sdata &&
574 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
575 extra.ethertype = tx->ethertype;
576
577 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
578 &extra);
579 if (unlikely(extra.probe != NULL)) {
580 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
581 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
582 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
583 tx->u.tx.rate = extra.probe;
584 } else {
585 tx->u.tx.control->alt_retry_rate = -1;
586 }
587 if (!tx->u.tx.rate)
588 return TXRX_DROP;
589 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
590 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
591 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
592 tx->u.tx.last_frag_rate = tx->u.tx.rate;
593 if (extra.probe)
594 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
595 else
596 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
597 tx->u.tx.rate = extra.nonerp;
598 tx->u.tx.control->rate = extra.nonerp;
599 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
600 } else {
601 tx->u.tx.last_frag_rate = tx->u.tx.rate;
602 tx->u.tx.control->rate = tx->u.tx.rate;
603 }
604 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
605
606 return TXRX_CONTINUE;
607 }
608
609 static ieee80211_txrx_result
610 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
611 {
612 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
613 u16 fc = le16_to_cpu(hdr->frame_control);
614 u16 dur;
615 struct ieee80211_tx_control *control = tx->u.tx.control;
616 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
617
618 if (!is_multicast_ether_addr(hdr->addr1)) {
619 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
620 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
621 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
622 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
623 control->retry_limit =
624 tx->local->long_retry_limit;
625 } else {
626 control->retry_limit =
627 tx->local->short_retry_limit;
628 }
629 } else {
630 control->retry_limit = 1;
631 }
632
633 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
634 /* Do not use multiple retry rates when sending fragmented
635 * frames.
636 * TODO: The last fragment could still use multiple retry
637 * rates. */
638 control->alt_retry_rate = -1;
639 }
640
641 /* Use CTS protection for unicast frames sent using extended rates if
642 * there are associated non-ERP stations and RTS/CTS is not configured
643 * for the frame. */
644 if (mode->mode == MODE_IEEE80211G &&
645 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
646 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
647 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
648 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
649 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
650
651 /* Transmit data frames using short preambles if the driver supports
652 * short preambles at the selected rate and short preambles are
653 * available on the network at the current point in time. */
654 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
655 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
656 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
657 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
658 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
659 }
660
661 /* Setup duration field for the first fragment of the frame. Duration
662 * for remaining fragments will be updated when they are being sent
663 * to low-level driver in ieee80211_tx(). */
664 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
665 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
666 tx->u.tx.extra_frag[0]->len : 0);
667 hdr->duration_id = cpu_to_le16(dur);
668
669 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
670 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
671 struct ieee80211_rate *rate;
672
673 /* Do not use multiple retry rates when using RTS/CTS */
674 control->alt_retry_rate = -1;
675
676 /* Use min(data rate, max base rate) as CTS/RTS rate */
677 rate = tx->u.tx.rate;
678 while (rate > mode->rates &&
679 !(rate->flags & IEEE80211_RATE_BASIC))
680 rate--;
681
682 control->rts_cts_rate = rate->val;
683 control->rts_rate = rate;
684 }
685
686 if (tx->sta) {
687 tx->sta->tx_packets++;
688 tx->sta->tx_fragments++;
689 tx->sta->tx_bytes += tx->skb->len;
690 if (tx->u.tx.extra_frag) {
691 int i;
692 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
693 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
694 tx->sta->tx_bytes +=
695 tx->u.tx.extra_frag[i]->len;
696 }
697 }
698 }
699
700 /*
701 * Tell hardware to not encrypt when we had sw crypto.
702 * Because we use the same flag to internally indicate that
703 * no (software) encryption should be done, we have to set it
704 * after all crypto handlers.
705 */
706 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
707 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
708
709 return TXRX_CONTINUE;
710 }
711
712 static ieee80211_txrx_result
713 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
714 {
715 struct ieee80211_local *local = tx->local;
716 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
717 struct sk_buff *skb = tx->skb;
718 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
719 u32 load = 0, hdrtime;
720
721 /* TODO: this could be part of tx_status handling, so that the number
722 * of retries would be known; TX rate should in that case be stored
723 * somewhere with the packet */
724
725 /* Estimate total channel use caused by this frame */
726
727 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
728 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
729
730 if (mode->mode == MODE_IEEE80211A ||
731 (mode->mode == MODE_IEEE80211G &&
732 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
733 hdrtime = CHAN_UTIL_HDR_SHORT;
734 else
735 hdrtime = CHAN_UTIL_HDR_LONG;
736
737 load = hdrtime;
738 if (!is_multicast_ether_addr(hdr->addr1))
739 load += hdrtime;
740
741 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
742 load += 2 * hdrtime;
743 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
744 load += hdrtime;
745
746 load += skb->len * tx->u.tx.rate->rate_inv;
747
748 if (tx->u.tx.extra_frag) {
749 int i;
750 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
751 load += 2 * hdrtime;
752 load += tx->u.tx.extra_frag[i]->len *
753 tx->u.tx.rate->rate;
754 }
755 }
756
757 /* Divide channel_use by 8 to avoid wrapping around the counter */
758 load >>= CHAN_UTIL_SHIFT;
759 local->channel_use_raw += load;
760 if (tx->sta)
761 tx->sta->channel_use_raw += load;
762 tx->sdata->channel_use_raw += load;
763
764 return TXRX_CONTINUE;
765 }
766
767 /* TODO: implement register/unregister functions for adding TX/RX handlers
768 * into ordered list */
769
770 ieee80211_tx_handler ieee80211_tx_handlers[] =
771 {
772 ieee80211_tx_h_check_assoc,
773 ieee80211_tx_h_sequence,
774 ieee80211_tx_h_ps_buf,
775 ieee80211_tx_h_select_key,
776 ieee80211_tx_h_michael_mic_add,
777 ieee80211_tx_h_fragment,
778 ieee80211_tx_h_encrypt,
779 ieee80211_tx_h_rate_ctrl,
780 ieee80211_tx_h_misc,
781 ieee80211_tx_h_load_stats,
782 NULL
783 };
784
785 /* actual transmit path */
786
787 /*
788 * deal with packet injection down monitor interface
789 * with Radiotap Header -- only called for monitor mode interface
790 */
791 static ieee80211_txrx_result
792 __ieee80211_parse_tx_radiotap(
793 struct ieee80211_txrx_data *tx,
794 struct sk_buff *skb, struct ieee80211_tx_control *control)
795 {
796 /*
797 * this is the moment to interpret and discard the radiotap header that
798 * must be at the start of the packet injected in Monitor mode
799 *
800 * Need to take some care with endian-ness since radiotap
801 * args are little-endian
802 */
803
804 struct ieee80211_radiotap_iterator iterator;
805 struct ieee80211_radiotap_header *rthdr =
806 (struct ieee80211_radiotap_header *) skb->data;
807 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
808 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
809
810 /*
811 * default control situation for all injected packets
812 * FIXME: this does not suit all usage cases, expand to allow control
813 */
814
815 control->retry_limit = 1; /* no retry */
816 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
817 IEEE80211_TXCTL_USE_CTS_PROTECT);
818 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
819 IEEE80211_TXCTL_NO_ACK;
820 control->antenna_sel_tx = 0; /* default to default antenna */
821
822 /*
823 * for every radiotap entry that is present
824 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
825 * entries present, or -EINVAL on error)
826 */
827
828 while (!ret) {
829 int i, target_rate;
830
831 ret = ieee80211_radiotap_iterator_next(&iterator);
832
833 if (ret)
834 continue;
835
836 /* see if this argument is something we can use */
837 switch (iterator.this_arg_index) {
838 /*
839 * You must take care when dereferencing iterator.this_arg
840 * for multibyte types... the pointer is not aligned. Use
841 * get_unaligned((type *)iterator.this_arg) to dereference
842 * iterator.this_arg for type "type" safely on all arches.
843 */
844 case IEEE80211_RADIOTAP_RATE:
845 /*
846 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
847 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
848 */
849 target_rate = (*iterator.this_arg) * 5;
850 for (i = 0; i < mode->num_rates; i++) {
851 struct ieee80211_rate *r = &mode->rates[i];
852
853 if (r->rate > target_rate)
854 continue;
855
856 control->rate = r;
857
858 if (r->flags & IEEE80211_RATE_PREAMBLE2)
859 control->tx_rate = r->val2;
860 else
861 control->tx_rate = r->val;
862
863 /* end on exact match */
864 if (r->rate == target_rate)
865 i = mode->num_rates;
866 }
867 break;
868
869 case IEEE80211_RADIOTAP_ANTENNA:
870 /*
871 * radiotap uses 0 for 1st ant, mac80211 is 1 for
872 * 1st ant
873 */
874 control->antenna_sel_tx = (*iterator.this_arg) + 1;
875 break;
876
877 case IEEE80211_RADIOTAP_DBM_TX_POWER:
878 control->power_level = *iterator.this_arg;
879 break;
880
881 case IEEE80211_RADIOTAP_FLAGS:
882 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
883 /*
884 * this indicates that the skb we have been
885 * handed has the 32-bit FCS CRC at the end...
886 * we should react to that by snipping it off
887 * because it will be recomputed and added
888 * on transmission
889 */
890 if (skb->len < (iterator.max_length + FCS_LEN))
891 return TXRX_DROP;
892
893 skb_trim(skb, skb->len - FCS_LEN);
894 }
895 break;
896
897 default:
898 break;
899 }
900 }
901
902 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
903 return TXRX_DROP;
904
905 /*
906 * remove the radiotap header
907 * iterator->max_length was sanity-checked against
908 * skb->len by iterator init
909 */
910 skb_pull(skb, iterator.max_length);
911
912 return TXRX_CONTINUE;
913 }
914
915 static ieee80211_txrx_result inline
916 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
917 struct sk_buff *skb,
918 struct net_device *dev,
919 struct ieee80211_tx_control *control)
920 {
921 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
922 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
923 struct ieee80211_sub_if_data *sdata;
924 ieee80211_txrx_result res = TXRX_CONTINUE;
925
926 int hdrlen;
927
928 memset(tx, 0, sizeof(*tx));
929 tx->skb = skb;
930 tx->dev = dev; /* use original interface */
931 tx->local = local;
932 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
933
934 /*
935 * set defaults for things that can be set by
936 * injected radiotap headers
937 */
938 control->power_level = local->hw.conf.power_level;
939 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
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, control) ==
945 TXRX_DROP) {
946 return TXRX_DROP;
947 }
948 /*
949 * we removed the radiotap header after this point,
950 * we filled control with what we could use
951 * set to the actual ieee header now
952 */
953 hdr = (struct ieee80211_hdr *) skb->data;
954 res = TXRX_QUEUED; /* indication it was monitor packet */
955 }
956
957 tx->sta = sta_info_get(local, hdr->addr1);
958 tx->fc = le16_to_cpu(hdr->frame_control);
959 tx->u.tx.control = control;
960 if (is_multicast_ether_addr(hdr->addr1)) {
961 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
962 control->flags |= IEEE80211_TXCTL_NO_ACK;
963 } else {
964 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
965 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
966 }
967 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
968 (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 if (!tx->sta)
975 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
976 else if (tx->sta->clear_dst_mask) {
977 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
978 tx->sta->clear_dst_mask = 0;
979 }
980 hdrlen = ieee80211_get_hdrlen(tx->fc);
981 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
982 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
983 tx->ethertype = (pos[0] << 8) | pos[1];
984 }
985 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
986
987 return res;
988 }
989
990 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
991 * finished with it. */
992 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
993 struct sk_buff *skb,
994 struct net_device *mdev,
995 struct ieee80211_tx_control *control)
996 {
997 struct ieee80211_tx_packet_data *pkt_data;
998 struct net_device *dev;
999
1000 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1001 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1002 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1003 dev_put(dev);
1004 dev = NULL;
1005 }
1006 if (unlikely(!dev))
1007 return -ENODEV;
1008 __ieee80211_tx_prepare(tx, skb, dev, control);
1009 return 0;
1010 }
1011
1012 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1013 struct ieee80211_txrx_data *tx)
1014 {
1015 struct ieee80211_tx_control *control = tx->u.tx.control;
1016 int ret, i;
1017
1018 if (!ieee80211_qdisc_installed(local->mdev) &&
1019 __ieee80211_queue_stopped(local, 0)) {
1020 netif_stop_queue(local->mdev);
1021 return IEEE80211_TX_AGAIN;
1022 }
1023 if (skb) {
1024 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1025 "TX to low-level driver", skb);
1026 ret = local->ops->tx(local_to_hw(local), skb, control);
1027 if (ret)
1028 return IEEE80211_TX_AGAIN;
1029 local->mdev->trans_start = jiffies;
1030 ieee80211_led_tx(local, 1);
1031 }
1032 if (tx->u.tx.extra_frag) {
1033 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1034 IEEE80211_TXCTL_USE_CTS_PROTECT |
1035 IEEE80211_TXCTL_CLEAR_DST_MASK |
1036 IEEE80211_TXCTL_FIRST_FRAGMENT);
1037 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1038 if (!tx->u.tx.extra_frag[i])
1039 continue;
1040 if (__ieee80211_queue_stopped(local, control->queue))
1041 return IEEE80211_TX_FRAG_AGAIN;
1042 if (i == tx->u.tx.num_extra_frag) {
1043 control->tx_rate = tx->u.tx.last_frag_hwrate;
1044 control->rate = tx->u.tx.last_frag_rate;
1045 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1046 control->flags |=
1047 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1048 else
1049 control->flags &=
1050 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1051 }
1052
1053 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1054 "TX to low-level driver",
1055 tx->u.tx.extra_frag[i]);
1056 ret = local->ops->tx(local_to_hw(local),
1057 tx->u.tx.extra_frag[i],
1058 control);
1059 if (ret)
1060 return IEEE80211_TX_FRAG_AGAIN;
1061 local->mdev->trans_start = jiffies;
1062 ieee80211_led_tx(local, 1);
1063 tx->u.tx.extra_frag[i] = NULL;
1064 }
1065 kfree(tx->u.tx.extra_frag);
1066 tx->u.tx.extra_frag = NULL;
1067 }
1068 return IEEE80211_TX_OK;
1069 }
1070
1071 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1072 struct ieee80211_tx_control *control, int mgmt)
1073 {
1074 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1075 struct sta_info *sta;
1076 ieee80211_tx_handler *handler;
1077 struct ieee80211_txrx_data tx;
1078 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1079 int ret, i;
1080
1081 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1082
1083 if (unlikely(skb->len < 10)) {
1084 dev_kfree_skb(skb);
1085 return 0;
1086 }
1087
1088 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1089
1090 if (res_prepare == TXRX_DROP) {
1091 dev_kfree_skb(skb);
1092 return 0;
1093 }
1094
1095 /*
1096 * key references are protected using RCU and this requires that
1097 * we are in a read-site RCU section during receive processing
1098 */
1099 rcu_read_lock();
1100
1101 sta = tx.sta;
1102 tx.u.tx.mgmt_interface = mgmt;
1103 tx.u.tx.mode = local->hw.conf.mode;
1104
1105 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1106 res = TXRX_CONTINUE;
1107 } else {
1108 for (handler = local->tx_handlers; *handler != NULL;
1109 handler++) {
1110 res = (*handler)(&tx);
1111 if (res != TXRX_CONTINUE)
1112 break;
1113 }
1114 }
1115
1116 skb = tx.skb; /* handlers are allowed to change skb */
1117
1118 if (sta)
1119 sta_info_put(sta);
1120
1121 if (unlikely(res == TXRX_DROP)) {
1122 I802_DEBUG_INC(local->tx_handlers_drop);
1123 goto drop;
1124 }
1125
1126 if (unlikely(res == TXRX_QUEUED)) {
1127 I802_DEBUG_INC(local->tx_handlers_queued);
1128 rcu_read_unlock();
1129 return 0;
1130 }
1131
1132 if (tx.u.tx.extra_frag) {
1133 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1134 int next_len, dur;
1135 struct ieee80211_hdr *hdr =
1136 (struct ieee80211_hdr *)
1137 tx.u.tx.extra_frag[i]->data;
1138
1139 if (i + 1 < tx.u.tx.num_extra_frag) {
1140 next_len = tx.u.tx.extra_frag[i + 1]->len;
1141 } else {
1142 next_len = 0;
1143 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1144 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1145 }
1146 dur = ieee80211_duration(&tx, 0, next_len);
1147 hdr->duration_id = cpu_to_le16(dur);
1148 }
1149 }
1150
1151 retry:
1152 ret = __ieee80211_tx(local, skb, &tx);
1153 if (ret) {
1154 struct ieee80211_tx_stored_packet *store =
1155 &local->pending_packet[control->queue];
1156
1157 if (ret == IEEE80211_TX_FRAG_AGAIN)
1158 skb = NULL;
1159 set_bit(IEEE80211_LINK_STATE_PENDING,
1160 &local->state[control->queue]);
1161 smp_mb();
1162 /* When the driver gets out of buffers during sending of
1163 * fragments and calls ieee80211_stop_queue, there is
1164 * a small window between IEEE80211_LINK_STATE_XOFF and
1165 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1166 * gets available in that window (i.e. driver calls
1167 * ieee80211_wake_queue), we would end up with ieee80211_tx
1168 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1169 * continuing transmitting here when that situation is
1170 * possible to have happened. */
1171 if (!__ieee80211_queue_stopped(local, control->queue)) {
1172 clear_bit(IEEE80211_LINK_STATE_PENDING,
1173 &local->state[control->queue]);
1174 goto retry;
1175 }
1176 memcpy(&store->control, control,
1177 sizeof(struct ieee80211_tx_control));
1178 store->skb = skb;
1179 store->extra_frag = tx.u.tx.extra_frag;
1180 store->num_extra_frag = tx.u.tx.num_extra_frag;
1181 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1182 store->last_frag_rate = tx.u.tx.last_frag_rate;
1183 store->last_frag_rate_ctrl_probe =
1184 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1185 }
1186 rcu_read_unlock();
1187 return 0;
1188
1189 drop:
1190 if (skb)
1191 dev_kfree_skb(skb);
1192 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1193 if (tx.u.tx.extra_frag[i])
1194 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1195 kfree(tx.u.tx.extra_frag);
1196 rcu_read_unlock();
1197 return 0;
1198 }
1199
1200 /* device xmit handlers */
1201
1202 int ieee80211_master_start_xmit(struct sk_buff *skb,
1203 struct net_device *dev)
1204 {
1205 struct ieee80211_tx_control control;
1206 struct ieee80211_tx_packet_data *pkt_data;
1207 struct net_device *odev = NULL;
1208 struct ieee80211_sub_if_data *osdata;
1209 int headroom;
1210 int ret;
1211
1212 /*
1213 * copy control out of the skb so other people can use skb->cb
1214 */
1215 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1216 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1217
1218 if (pkt_data->ifindex)
1219 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1220 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1221 dev_put(odev);
1222 odev = NULL;
1223 }
1224 if (unlikely(!odev)) {
1225 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1226 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1227 "originating device\n", dev->name);
1228 #endif
1229 dev_kfree_skb(skb);
1230 return 0;
1231 }
1232 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1233
1234 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1235 if (skb_headroom(skb) < headroom) {
1236 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1237 dev_kfree_skb(skb);
1238 dev_put(odev);
1239 return 0;
1240 }
1241 }
1242
1243 control.ifindex = odev->ifindex;
1244 control.type = osdata->type;
1245 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1246 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1247 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1248 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1249 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1250 control.flags |= IEEE80211_TXCTL_REQUEUE;
1251 control.queue = pkt_data->queue;
1252
1253 ret = ieee80211_tx(odev, skb, &control,
1254 control.type == IEEE80211_IF_TYPE_MGMT);
1255 dev_put(odev);
1256
1257 return ret;
1258 }
1259
1260 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1261 struct net_device *dev)
1262 {
1263 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1264 struct ieee80211_tx_packet_data *pkt_data;
1265 struct ieee80211_radiotap_header *prthdr =
1266 (struct ieee80211_radiotap_header *)skb->data;
1267 u16 len_rthdr;
1268
1269 /* check for not even having the fixed radiotap header part */
1270 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1271 goto fail; /* too short to be possibly valid */
1272
1273 /* is it a header version we can trust to find length from? */
1274 if (unlikely(prthdr->it_version))
1275 goto fail; /* only version 0 is supported */
1276
1277 /* then there must be a radiotap header with a length we can use */
1278 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1279
1280 /* does the skb contain enough to deliver on the alleged length? */
1281 if (unlikely(skb->len < len_rthdr))
1282 goto fail; /* skb too short for claimed rt header extent */
1283
1284 skb->dev = local->mdev;
1285
1286 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1287 memset(pkt_data, 0, sizeof(*pkt_data));
1288 /* needed because we set skb device to master */
1289 pkt_data->ifindex = dev->ifindex;
1290
1291 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1292
1293 /*
1294 * fix up the pointers accounting for the radiotap
1295 * header still being in there. We are being given
1296 * a precooked IEEE80211 header so no need for
1297 * normal processing
1298 */
1299 skb_set_mac_header(skb, len_rthdr);
1300 /*
1301 * these are just fixed to the end of the rt area since we
1302 * don't have any better information and at this point, nobody cares
1303 */
1304 skb_set_network_header(skb, len_rthdr);
1305 skb_set_transport_header(skb, len_rthdr);
1306
1307 /* pass the radiotap header up to the next stage intact */
1308 dev_queue_xmit(skb);
1309 return NETDEV_TX_OK;
1310
1311 fail:
1312 dev_kfree_skb(skb);
1313 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1314 }
1315
1316 /**
1317 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1318 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1319 * @skb: packet to be sent
1320 * @dev: incoming interface
1321 *
1322 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1323 * not be freed, and caller is responsible for either retrying later or freeing
1324 * skb).
1325 *
1326 * This function takes in an Ethernet header and encapsulates it with suitable
1327 * IEEE 802.11 header based on which interface the packet is coming in. The
1328 * encapsulated packet will then be passed to master interface, wlan#.11, for
1329 * transmission (through low-level driver).
1330 */
1331 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1332 struct net_device *dev)
1333 {
1334 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1335 struct ieee80211_tx_packet_data *pkt_data;
1336 struct ieee80211_sub_if_data *sdata;
1337 int ret = 1, head_need;
1338 u16 ethertype, hdrlen, fc;
1339 struct ieee80211_hdr hdr;
1340 const u8 *encaps_data;
1341 int encaps_len, skip_header_bytes;
1342 int nh_pos, h_pos;
1343 struct sta_info *sta;
1344
1345 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1346 if (unlikely(skb->len < ETH_HLEN)) {
1347 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1348 dev->name, skb->len);
1349 ret = 0;
1350 goto fail;
1351 }
1352
1353 nh_pos = skb_network_header(skb) - skb->data;
1354 h_pos = skb_transport_header(skb) - skb->data;
1355
1356 /* convert Ethernet header to proper 802.11 header (based on
1357 * operation mode) */
1358 ethertype = (skb->data[12] << 8) | skb->data[13];
1359 /* TODO: handling for 802.1x authorized/unauthorized port */
1360 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1361
1362 switch (sdata->type) {
1363 case IEEE80211_IF_TYPE_AP:
1364 case IEEE80211_IF_TYPE_VLAN:
1365 fc |= IEEE80211_FCTL_FROMDS;
1366 /* DA BSSID SA */
1367 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1368 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1369 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1370 hdrlen = 24;
1371 break;
1372 case IEEE80211_IF_TYPE_WDS:
1373 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1374 /* RA TA DA SA */
1375 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1376 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1377 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1378 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1379 hdrlen = 30;
1380 break;
1381 case IEEE80211_IF_TYPE_STA:
1382 fc |= IEEE80211_FCTL_TODS;
1383 /* BSSID SA DA */
1384 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1385 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1386 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1387 hdrlen = 24;
1388 break;
1389 case IEEE80211_IF_TYPE_IBSS:
1390 /* DA SA BSSID */
1391 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1392 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1393 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1394 hdrlen = 24;
1395 break;
1396 default:
1397 ret = 0;
1398 goto fail;
1399 }
1400
1401 /* receiver is QoS enabled, use a QoS type frame */
1402 sta = sta_info_get(local, hdr.addr1);
1403 if (sta) {
1404 if (sta->flags & WLAN_STA_WME) {
1405 fc |= IEEE80211_STYPE_QOS_DATA;
1406 hdrlen += 2;
1407 }
1408 sta_info_put(sta);
1409 }
1410
1411 hdr.frame_control = cpu_to_le16(fc);
1412 hdr.duration_id = 0;
1413 hdr.seq_ctrl = 0;
1414
1415 skip_header_bytes = ETH_HLEN;
1416 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1417 encaps_data = bridge_tunnel_header;
1418 encaps_len = sizeof(bridge_tunnel_header);
1419 skip_header_bytes -= 2;
1420 } else if (ethertype >= 0x600) {
1421 encaps_data = rfc1042_header;
1422 encaps_len = sizeof(rfc1042_header);
1423 skip_header_bytes -= 2;
1424 } else {
1425 encaps_data = NULL;
1426 encaps_len = 0;
1427 }
1428
1429 skb_pull(skb, skip_header_bytes);
1430 nh_pos -= skip_header_bytes;
1431 h_pos -= skip_header_bytes;
1432
1433 /* TODO: implement support for fragments so that there is no need to
1434 * reallocate and copy payload; it might be enough to support one
1435 * extra fragment that would be copied in the beginning of the frame
1436 * data.. anyway, it would be nice to include this into skb structure
1437 * somehow
1438 *
1439 * There are few options for this:
1440 * use skb->cb as an extra space for 802.11 header
1441 * allocate new buffer if not enough headroom
1442 * make sure that there is enough headroom in every skb by increasing
1443 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1444 * alloc_skb() (net/core/skbuff.c)
1445 */
1446 head_need = hdrlen + encaps_len + local->tx_headroom;
1447 head_need -= skb_headroom(skb);
1448
1449 /* We are going to modify skb data, so make a copy of it if happens to
1450 * be cloned. This could happen, e.g., with Linux bridge code passing
1451 * us broadcast frames. */
1452
1453 if (head_need > 0 || skb_cloned(skb)) {
1454 #if 0
1455 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1456 "of headroom\n", dev->name, head_need);
1457 #endif
1458
1459 if (skb_cloned(skb))
1460 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1461 else
1462 I802_DEBUG_INC(local->tx_expand_skb_head);
1463 /* Since we have to reallocate the buffer, make sure that there
1464 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1465 * before payload and 12 after). */
1466 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1467 12, GFP_ATOMIC)) {
1468 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1469 "\n", dev->name);
1470 goto fail;
1471 }
1472 }
1473
1474 if (encaps_data) {
1475 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1476 nh_pos += encaps_len;
1477 h_pos += encaps_len;
1478 }
1479
1480 if (fc & IEEE80211_STYPE_QOS_DATA) {
1481 __le16 *qos_control;
1482
1483 qos_control = (__le16*) skb_push(skb, 2);
1484 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1485 /*
1486 * Maybe we could actually set some fields here, for now just
1487 * initialise to zero to indicate no special operation.
1488 */
1489 *qos_control = 0;
1490 } else
1491 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1492
1493 nh_pos += hdrlen;
1494 h_pos += hdrlen;
1495
1496 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1497 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1498 pkt_data->ifindex = dev->ifindex;
1499 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1500 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
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 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1559 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1560
1561 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1562 skb->dev = sdata->local->mdev;
1563
1564 /*
1565 * We're using the protocol field of the the frame control header
1566 * to request TX callback for hostapd. BIT(1) is checked.
1567 */
1568 if ((fc & BIT(1)) == BIT(1)) {
1569 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1570 fc &= ~BIT(1);
1571 hdr->frame_control = cpu_to_le16(fc);
1572 }
1573
1574 if (!(fc & IEEE80211_FCTL_PROTECTED))
1575 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1576
1577 dev->stats.tx_packets++;
1578 dev->stats.tx_bytes += skb->len;
1579
1580 dev_queue_xmit(skb);
1581
1582 return 0;
1583 }
1584
1585 /* helper functions for pending packets for when queues are stopped */
1586
1587 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1588 {
1589 int i, j;
1590 struct ieee80211_tx_stored_packet *store;
1591
1592 for (i = 0; i < local->hw.queues; i++) {
1593 if (!__ieee80211_queue_pending(local, i))
1594 continue;
1595 store = &local->pending_packet[i];
1596 kfree_skb(store->skb);
1597 for (j = 0; j < store->num_extra_frag; j++)
1598 kfree_skb(store->extra_frag[j]);
1599 kfree(store->extra_frag);
1600 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1601 }
1602 }
1603
1604 void ieee80211_tx_pending(unsigned long data)
1605 {
1606 struct ieee80211_local *local = (struct ieee80211_local *)data;
1607 struct net_device *dev = local->mdev;
1608 struct ieee80211_tx_stored_packet *store;
1609 struct ieee80211_txrx_data tx;
1610 int i, ret, reschedule = 0;
1611
1612 netif_tx_lock_bh(dev);
1613 for (i = 0; i < local->hw.queues; i++) {
1614 if (__ieee80211_queue_stopped(local, i))
1615 continue;
1616 if (!__ieee80211_queue_pending(local, i)) {
1617 reschedule = 1;
1618 continue;
1619 }
1620 store = &local->pending_packet[i];
1621 tx.u.tx.control = &store->control;
1622 tx.u.tx.extra_frag = store->extra_frag;
1623 tx.u.tx.num_extra_frag = store->num_extra_frag;
1624 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1625 tx.u.tx.last_frag_rate = store->last_frag_rate;
1626 tx.flags = 0;
1627 if (store->last_frag_rate_ctrl_probe)
1628 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1629 ret = __ieee80211_tx(local, store->skb, &tx);
1630 if (ret) {
1631 if (ret == IEEE80211_TX_FRAG_AGAIN)
1632 store->skb = NULL;
1633 } else {
1634 clear_bit(IEEE80211_LINK_STATE_PENDING,
1635 &local->state[i]);
1636 reschedule = 1;
1637 }
1638 }
1639 netif_tx_unlock_bh(dev);
1640 if (reschedule) {
1641 if (!ieee80211_qdisc_installed(dev)) {
1642 if (!__ieee80211_queue_stopped(local, 0))
1643 netif_wake_queue(dev);
1644 } else
1645 netif_schedule(dev);
1646 }
1647 }
1648
1649 /* functions for drivers to get certain frames */
1650
1651 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1652 struct ieee80211_if_ap *bss,
1653 struct sk_buff *skb)
1654 {
1655 u8 *pos, *tim;
1656 int aid0 = 0;
1657 int i, have_bits = 0, n1, n2;
1658
1659 /* Generate bitmap for TIM only if there are any STAs in power save
1660 * mode. */
1661 read_lock_bh(&local->sta_lock);
1662 if (atomic_read(&bss->num_sta_ps) > 0)
1663 /* in the hope that this is faster than
1664 * checking byte-for-byte */
1665 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1666 IEEE80211_MAX_AID+1);
1667
1668 if (bss->dtim_count == 0)
1669 bss->dtim_count = bss->dtim_period - 1;
1670 else
1671 bss->dtim_count--;
1672
1673 tim = pos = (u8 *) skb_put(skb, 6);
1674 *pos++ = WLAN_EID_TIM;
1675 *pos++ = 4;
1676 *pos++ = bss->dtim_count;
1677 *pos++ = bss->dtim_period;
1678
1679 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1680 aid0 = 1;
1681
1682 if (have_bits) {
1683 /* Find largest even number N1 so that bits numbered 1 through
1684 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1685 * (N2 + 1) x 8 through 2007 are 0. */
1686 n1 = 0;
1687 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1688 if (bss->tim[i]) {
1689 n1 = i & 0xfe;
1690 break;
1691 }
1692 }
1693 n2 = n1;
1694 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1695 if (bss->tim[i]) {
1696 n2 = i;
1697 break;
1698 }
1699 }
1700
1701 /* Bitmap control */
1702 *pos++ = n1 | aid0;
1703 /* Part Virt Bitmap */
1704 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1705
1706 tim[1] = n2 - n1 + 4;
1707 skb_put(skb, n2 - n1);
1708 } else {
1709 *pos++ = aid0; /* Bitmap control */
1710 *pos++ = 0; /* Part Virt Bitmap */
1711 }
1712 read_unlock_bh(&local->sta_lock);
1713 }
1714
1715 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1716 struct ieee80211_tx_control *control)
1717 {
1718 struct ieee80211_local *local = hw_to_local(hw);
1719 struct sk_buff *skb;
1720 struct net_device *bdev;
1721 struct ieee80211_sub_if_data *sdata = NULL;
1722 struct ieee80211_if_ap *ap = NULL;
1723 struct ieee80211_rate *rate;
1724 struct rate_control_extra extra;
1725 u8 *b_head, *b_tail;
1726 int bh_len, bt_len;
1727
1728 bdev = dev_get_by_index(&init_net, if_id);
1729 if (bdev) {
1730 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1731 ap = &sdata->u.ap;
1732 dev_put(bdev);
1733 }
1734
1735 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1736 !ap->beacon_head) {
1737 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1738 if (net_ratelimit())
1739 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1740 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1741 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1742 return NULL;
1743 }
1744
1745 /* Assume we are generating the normal beacon locally */
1746 b_head = ap->beacon_head;
1747 b_tail = ap->beacon_tail;
1748 bh_len = ap->beacon_head_len;
1749 bt_len = ap->beacon_tail_len;
1750
1751 skb = dev_alloc_skb(local->tx_headroom +
1752 bh_len + bt_len + 256 /* maximum TIM len */);
1753 if (!skb)
1754 return NULL;
1755
1756 skb_reserve(skb, local->tx_headroom);
1757 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1758
1759 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1760
1761 ieee80211_beacon_add_tim(local, ap, skb);
1762
1763 if (b_tail) {
1764 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1765 }
1766
1767 if (control) {
1768 memset(&extra, 0, sizeof(extra));
1769 extra.mode = local->oper_hw_mode;
1770
1771 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1772 if (!rate) {
1773 if (net_ratelimit()) {
1774 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1775 "found\n", wiphy_name(local->hw.wiphy));
1776 }
1777 dev_kfree_skb(skb);
1778 return NULL;
1779 }
1780
1781 control->tx_rate =
1782 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1783 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1784 rate->val2 : rate->val;
1785 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1786 control->power_level = local->hw.conf.power_level;
1787 control->flags |= IEEE80211_TXCTL_NO_ACK;
1788 control->retry_limit = 1;
1789 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1790 }
1791
1792 ap->num_beacons++;
1793 return skb;
1794 }
1795 EXPORT_SYMBOL(ieee80211_beacon_get);
1796
1797 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1798 const void *frame, size_t frame_len,
1799 const struct ieee80211_tx_control *frame_txctl,
1800 struct ieee80211_rts *rts)
1801 {
1802 const struct ieee80211_hdr *hdr = frame;
1803 u16 fctl;
1804
1805 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1806 rts->frame_control = cpu_to_le16(fctl);
1807 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1808 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1809 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1810 }
1811 EXPORT_SYMBOL(ieee80211_rts_get);
1812
1813 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1814 const void *frame, size_t frame_len,
1815 const struct ieee80211_tx_control *frame_txctl,
1816 struct ieee80211_cts *cts)
1817 {
1818 const struct ieee80211_hdr *hdr = frame;
1819 u16 fctl;
1820
1821 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1822 cts->frame_control = cpu_to_le16(fctl);
1823 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1824 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1825 }
1826 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1827
1828 struct sk_buff *
1829 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1830 struct ieee80211_tx_control *control)
1831 {
1832 struct ieee80211_local *local = hw_to_local(hw);
1833 struct sk_buff *skb;
1834 struct sta_info *sta;
1835 ieee80211_tx_handler *handler;
1836 struct ieee80211_txrx_data tx;
1837 ieee80211_txrx_result res = TXRX_DROP;
1838 struct net_device *bdev;
1839 struct ieee80211_sub_if_data *sdata;
1840 struct ieee80211_if_ap *bss = NULL;
1841
1842 bdev = dev_get_by_index(&init_net, if_id);
1843 if (bdev) {
1844 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1845 bss = &sdata->u.ap;
1846 dev_put(bdev);
1847 }
1848 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1849 return NULL;
1850
1851 if (bss->dtim_count != 0)
1852 return NULL; /* send buffered bc/mc only after DTIM beacon */
1853 memset(control, 0, sizeof(*control));
1854 while (1) {
1855 skb = skb_dequeue(&bss->ps_bc_buf);
1856 if (!skb)
1857 return NULL;
1858 local->total_ps_buffered--;
1859
1860 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1861 struct ieee80211_hdr *hdr =
1862 (struct ieee80211_hdr *) skb->data;
1863 /* more buffered multicast/broadcast frames ==> set
1864 * MoreData flag in IEEE 802.11 header to inform PS
1865 * STAs */
1866 hdr->frame_control |=
1867 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1868 }
1869
1870 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1871 break;
1872 dev_kfree_skb_any(skb);
1873 }
1874 sta = tx.sta;
1875 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1876 tx.u.tx.mode = local->hw.conf.mode;
1877
1878 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1879 res = (*handler)(&tx);
1880 if (res == TXRX_DROP || res == TXRX_QUEUED)
1881 break;
1882 }
1883 dev_put(tx.dev);
1884 skb = tx.skb; /* handlers are allowed to change skb */
1885
1886 if (res == TXRX_DROP) {
1887 I802_DEBUG_INC(local->tx_handlers_drop);
1888 dev_kfree_skb(skb);
1889 skb = NULL;
1890 } else if (res == TXRX_QUEUED) {
1891 I802_DEBUG_INC(local->tx_handlers_queued);
1892 skb = NULL;
1893 }
1894
1895 if (sta)
1896 sta_info_put(sta);
1897
1898 return skb;
1899 }
1900 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Support for the Chinese Samsung S3C2440 based development boards