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[MAC80211]: remove fake set_key() call
[deliverable/linux.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 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 <net/ieee80211_radiotap.h>
21#include <net/cfg80211.h>
22#include <net/mac80211.h>
23#include <asm/unaligned.h>
24
25#include "ieee80211_i.h"
26#include "ieee80211_led.h"
27#include "wep.h"
28#include "wpa.h"
29#include "wme.h"
30#include "ieee80211_rate.h"
31
32#define IEEE80211_TX_OK 0
33#define IEEE80211_TX_AGAIN 1
34#define IEEE80211_TX_FRAG_AGAIN 2
35
36/* misc utils */
37
38static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
39 struct ieee80211_hdr *hdr)
40{
41 /* Set the sequence number for this frame. */
42 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
43
44 /* Increase the sequence number. */
45 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
46}
47
48#ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
49static void ieee80211_dump_frame(const char *ifname, const char *title,
50 const struct sk_buff *skb)
51{
52 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
53 u16 fc;
54 int hdrlen;
55
56 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
57 if (skb->len < 4) {
58 printk("\n");
59 return;
60 }
61
62 fc = le16_to_cpu(hdr->frame_control);
63 hdrlen = ieee80211_get_hdrlen(fc);
64 if (hdrlen > skb->len)
65 hdrlen = skb->len;
66 if (hdrlen >= 4)
67 printk(" FC=0x%04x DUR=0x%04x",
68 fc, le16_to_cpu(hdr->duration_id));
69 if (hdrlen >= 10)
70 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
71 if (hdrlen >= 16)
72 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
73 if (hdrlen >= 24)
74 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
75 if (hdrlen >= 30)
76 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
77 printk("\n");
78}
79#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
80static inline void ieee80211_dump_frame(const char *ifname, const char *title,
81 struct sk_buff *skb)
82{
83}
84#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
85
86static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
87 int next_frag_len)
88{
89 int rate, mrate, erp, dur, i;
90 struct ieee80211_rate *txrate = tx->u.tx.rate;
91 struct ieee80211_local *local = tx->local;
92 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
93
94 erp = txrate->flags & IEEE80211_RATE_ERP;
95
96 /*
97 * data and mgmt (except PS Poll):
98 * - during CFP: 32768
99 * - during contention period:
100 * if addr1 is group address: 0
101 * if more fragments = 0 and addr1 is individual address: time to
102 * transmit one ACK plus SIFS
103 * if more fragments = 1 and addr1 is individual address: time to
104 * transmit next fragment plus 2 x ACK plus 3 x SIFS
105 *
106 * IEEE 802.11, 9.6:
107 * - control response frame (CTS or ACK) shall be transmitted using the
108 * same rate as the immediately previous frame in the frame exchange
109 * sequence, if this rate belongs to the PHY mandatory rates, or else
110 * at the highest possible rate belonging to the PHY rates in the
111 * BSSBasicRateSet
112 */
113
114 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
115 /* TODO: These control frames are not currently sent by
116 * 80211.o, but should they be implemented, this function
117 * needs to be updated to support duration field calculation.
118 *
119 * RTS: time needed to transmit pending data/mgmt frame plus
120 * one CTS frame plus one ACK frame plus 3 x SIFS
121 * CTS: duration of immediately previous RTS minus time
122 * required to transmit CTS and its SIFS
123 * ACK: 0 if immediately previous directed data/mgmt had
124 * more=0, with more=1 duration in ACK frame is duration
125 * from previous frame minus time needed to transmit ACK
126 * and its SIFS
127 * PS Poll: BIT(15) | BIT(14) | aid
128 */
129 return 0;
130 }
131
132 /* data/mgmt */
133 if (0 /* FIX: data/mgmt during CFP */)
134 return 32768;
135
136 if (group_addr) /* Group address as the destination - no ACK */
137 return 0;
138
139 /* Individual destination address:
140 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
141 * CTS and ACK frames shall be transmitted using the highest rate in
142 * basic rate set that is less than or equal to the rate of the
143 * immediately previous frame and that is using the same modulation
144 * (CCK or OFDM). If no basic rate set matches with these requirements,
145 * the highest mandatory rate of the PHY that is less than or equal to
146 * the rate of the previous frame is used.
147 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
148 */
149 rate = -1;
150 mrate = 10; /* use 1 Mbps if everything fails */
151 for (i = 0; i < mode->num_rates; i++) {
152 struct ieee80211_rate *r = &mode->rates[i];
153 if (r->rate > txrate->rate)
154 break;
155
156 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
157 IEEE80211_RATE_MODULATION(r->flags))
158 continue;
159
160 if (r->flags & IEEE80211_RATE_BASIC)
161 rate = r->rate;
162 else if (r->flags & IEEE80211_RATE_MANDATORY)
163 mrate = r->rate;
164 }
165 if (rate == -1) {
166 /* No matching basic rate found; use highest suitable mandatory
167 * PHY rate */
168 rate = mrate;
169 }
170
171 /* Time needed to transmit ACK
172 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
173 * to closest integer */
174
175 dur = ieee80211_frame_duration(local, 10, rate, erp,
13262ffd 176 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 177
178 if (next_frag_len) {
179 /* Frame is fragmented: duration increases with time needed to
180 * transmit next fragment plus ACK and 2 x SIFS. */
181 dur *= 2; /* ACK + SIFS */
182 /* next fragment */
183 dur += ieee80211_frame_duration(local, next_frag_len,
13262ffd
JS		 184 txrate->rate, erp,
185 tx->sdata->flags &
186 IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 187 }
188
189 return dur;
190}
191
192static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
193 int queue)
194{
195 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
196}
197
198static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
199 int queue)
200{
201 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
202}
203
204static int inline is_ieee80211_device(struct net_device *dev,
205 struct net_device *master)
206{
207 return (wdev_priv(dev->ieee80211_ptr) ==
208 wdev_priv(master->ieee80211_ptr));
209}
210
211/* tx handlers */
212
213static ieee80211_txrx_result
214ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
215{
216#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
217 struct sk_buff *skb = tx->skb;
218 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
219#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
220 u32 sta_flags;
221
222 if (unlikely(tx->local->sta_scanning != 0) &&
223 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
224 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
225 return TXRX_DROP;
226
badffb72 227 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
e2ebc74d
JB		 228 return TXRX_CONTINUE;
229
230 sta_flags = tx->sta ? tx->sta->flags : 0;
231
badffb72 232 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
e2ebc74d
JB		 233 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
234 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
235 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
236#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
237 printk(KERN_DEBUG "%s: dropped data frame to not "
238 "associated station " MAC_FMT "\n",
239 tx->dev->name, MAC_ARG(hdr->addr1));
240#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
241 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
242 return TXRX_DROP;
243 }
244 } else {
245 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
246 tx->local->num_sta == 0 &&
e2ebc74d
JB		 247 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
248 /*
249 * No associated STAs - no need to send multicast
250 * frames.
251 */
252 return TXRX_DROP;
253 }
254 return TXRX_CONTINUE;
255 }
256
257 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
258 !(sta_flags & WLAN_STA_AUTHORIZED))) {
259#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
260 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
261 " (unauthorized port)\n", tx->dev->name,
262 MAC_ARG(hdr->addr1));
263#endif
264 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
265 return TXRX_DROP;
266 }
267
268 return TXRX_CONTINUE;
269}
270
271static ieee80211_txrx_result
272ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
273{
274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
275
276 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
277 ieee80211_include_sequence(tx->sdata, hdr);
278
279 return TXRX_CONTINUE;
280}
281
282/* This function is called whenever the AP is about to exceed the maximum limit
283 * of buffered frames for power saving STAs. This situation should not really
284 * happen often during normal operation, so dropping the oldest buffered packet
285 * from each queue should be OK to make some room for new frames. */
286static void purge_old_ps_buffers(struct ieee80211_local *local)
287{
288 int total = 0, purged = 0;
289 struct sk_buff *skb;
290 struct ieee80211_sub_if_data *sdata;
291 struct sta_info *sta;
292
293 read_lock(&local->sub_if_lock);
294 list_for_each_entry(sdata, &local->sub_if_list, list) {
295 struct ieee80211_if_ap *ap;
296 if (sdata->dev == local->mdev ||
297 sdata->type != IEEE80211_IF_TYPE_AP)
298 continue;
299 ap = &sdata->u.ap;
300 skb = skb_dequeue(&ap->ps_bc_buf);
301 if (skb) {
302 purged++;
303 dev_kfree_skb(skb);
304 }
305 total += skb_queue_len(&ap->ps_bc_buf);
306 }
307 read_unlock(&local->sub_if_lock);
308
be8755e1 309 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 310 list_for_each_entry(sta, &local->sta_list, list) {
311 skb = skb_dequeue(&sta->ps_tx_buf);
312 if (skb) {
313 purged++;
314 dev_kfree_skb(skb);
315 }
316 total += skb_queue_len(&sta->ps_tx_buf);
317 }
be8755e1 318 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 319
320 local->total_ps_buffered = total;
321 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
322 local->mdev->name, purged);
323}
324
325static inline ieee80211_txrx_result
326ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
327{
328 /* broadcast/multicast frame */
329 /* If any of the associated stations is in power save mode,
330 * the frame is buffered to be sent after DTIM beacon frame */
331 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
332 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
333 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
334 !(tx->fc & IEEE80211_FCTL_ORDER)) {
335 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
336 purge_old_ps_buffers(tx->local);
337 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
338 AP_MAX_BC_BUFFER) {
339 if (net_ratelimit()) {
340 printk(KERN_DEBUG "%s: BC TX buffer full - "
341 "dropping the oldest frame\n",
342 tx->dev->name);
343 }
344 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
345 } else
346 tx->local->total_ps_buffered++;
347 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
348 return TXRX_QUEUED;
349 }
350
351 return TXRX_CONTINUE;
352}
353
354static inline ieee80211_txrx_result
355ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
356{
357 struct sta_info *sta = tx->sta;
358
359 if (unlikely(!sta ||
360 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
361 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
362 return TXRX_CONTINUE;
363
364 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
365 struct ieee80211_tx_packet_data *pkt_data;
366#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
367 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
368 "before %d)\n",
369 MAC_ARG(sta->addr), sta->aid,
370 skb_queue_len(&sta->ps_tx_buf));
371#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
372 sta->flags |= WLAN_STA_TIM;
373 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
374 purge_old_ps_buffers(tx->local);
375 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
376 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
377 if (net_ratelimit()) {
378 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
379 "buffer full - dropping oldest frame\n",
380 tx->dev->name, MAC_ARG(sta->addr));
381 }
382 dev_kfree_skb(old);
383 } else
384 tx->local->total_ps_buffered++;
385 /* Queue frame to be sent after STA sends an PS Poll frame */
386 if (skb_queue_empty(&sta->ps_tx_buf)) {
387 if (tx->local->ops->set_tim)
388 tx->local->ops->set_tim(local_to_hw(tx->local),
389 sta->aid, 1);
390 if (tx->sdata->bss)
391 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
392 }
393 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
394 pkt_data->jiffies = jiffies;
395 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
396 return TXRX_QUEUED;
397 }
398#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
399 else if (unlikely(sta->flags & WLAN_STA_PS)) {
400 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
401 "set -> send frame\n", tx->dev->name,
402 MAC_ARG(sta->addr));
403 }
404#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
405 sta->pspoll = 0;
406
407 return TXRX_CONTINUE;
408}
409
410
411static ieee80211_txrx_result
412ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
413{
badffb72 414 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
e2ebc74d
JB		 415 return TXRX_CONTINUE;
416
badffb72 417 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
e2ebc74d
JB		 418 return ieee80211_tx_h_unicast_ps_buf(tx);
419 else
420 return ieee80211_tx_h_multicast_ps_buf(tx);
421}
422
423
424
425
426static ieee80211_txrx_result
427ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
428{
3aefaa32 429 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
e2ebc74d
JB		 430
431 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
432 tx->key = NULL;
433 else if (tx->sta && tx->sta->key)
434 tx->key = tx->sta->key;
435 else if (tx->sdata->default_key)
436 tx->key = tx->sdata->default_key;
437 else if (tx->sdata->drop_unencrypted &&
438 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
439 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
440 return TXRX_DROP;
441 } else
442 tx->key = NULL;
443
444 if (tx->key) {
445 tx->key->tx_rx_count++;
446 if (unlikely(tx->local->key_tx_rx_threshold &&
447 tx->key->tx_rx_count >
448 tx->local->key_tx_rx_threshold)) {
449 ieee80211_key_threshold_notify(tx->dev, tx->key,
450 tx->sta);
451 }
452 }
453
454 return TXRX_CONTINUE;
455}
456
457static ieee80211_txrx_result
458ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
459{
460 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
461 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
462 struct sk_buff **frags, *first, *frag;
463 int i;
464 u16 seq;
465 u8 *pos;
466 int frag_threshold = tx->local->fragmentation_threshold;
467
badffb72 468 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
e2ebc74d
JB		 469 return TXRX_CONTINUE;
470
471 first = tx->skb;
472
473 hdrlen = ieee80211_get_hdrlen(tx->fc);
474 payload_len = first->len - hdrlen;
475 per_fragm = frag_threshold - hdrlen - FCS_LEN;
172589cc 476 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
e2ebc74d
JB		 477
478 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
479 if (!frags)
480 goto fail;
481
482 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
483 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
484 pos = first->data + hdrlen + per_fragm;
485 left = payload_len - per_fragm;
486 for (i = 0; i < num_fragm - 1; i++) {
487 struct ieee80211_hdr *fhdr;
488 size_t copylen;
489
490 if (left <= 0)
491 goto fail;
492
493 /* reserve enough extra head and tail room for possible
494 * encryption */
495 frag = frags[i] =
496 dev_alloc_skb(tx->local->tx_headroom +
497 frag_threshold +
498 IEEE80211_ENCRYPT_HEADROOM +
499 IEEE80211_ENCRYPT_TAILROOM);
500 if (!frag)
501 goto fail;
502 /* Make sure that all fragments use the same priority so
503 * that they end up using the same TX queue */
504 frag->priority = first->priority;
505 skb_reserve(frag, tx->local->tx_headroom +
506 IEEE80211_ENCRYPT_HEADROOM);
507 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
508 memcpy(fhdr, first->data, hdrlen);
509 if (i == num_fragm - 2)
510 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
511 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
512 copylen = left > per_fragm ? per_fragm : left;
513 memcpy(skb_put(frag, copylen), pos, copylen);
514
515 pos += copylen;
516 left -= copylen;
517 }
518 skb_trim(first, hdrlen + per_fragm);
519
520 tx->u.tx.num_extra_frag = num_fragm - 1;
521 tx->u.tx.extra_frag = frags;
522
523 return TXRX_CONTINUE;
524
525 fail:
526 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
527 if (frags) {
528 for (i = 0; i < num_fragm - 1; i++)
529 if (frags[i])
530 dev_kfree_skb(frags[i]);
531 kfree(frags);
532 }
533 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
534 return TXRX_DROP;
535}
536
537static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
538{
8f20fc24 539 if (tx->key->conf.flags & IEEE80211_KEY_FORCE_SW_ENCRYPT) {
e2ebc74d
JB		 540 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
541 return -1;
542 } else {
8f20fc24 543 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
e2ebc74d
JB		 544 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
545 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
546 NULL)
547 return -1;
548 }
549 }
550 return 0;
551}
552
553static ieee80211_txrx_result
554ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
555{
556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
557 u16 fc;
558
559 fc = le16_to_cpu(hdr->frame_control);
560
8f20fc24 561 if (!tx->key || tx->key->conf.alg != ALG_WEP ||
e2ebc74d
JB		 562 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
563 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
564 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
565 return TXRX_CONTINUE;
566
567 tx->u.tx.control->iv_len = WEP_IV_LEN;
568 tx->u.tx.control->icv_len = WEP_ICV_LEN;
569 ieee80211_tx_set_iswep(tx);
570
571 if (wep_encrypt_skb(tx, tx->skb) < 0) {
572 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
573 return TXRX_DROP;
574 }
575
576 if (tx->u.tx.extra_frag) {
577 int i;
578 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
579 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
580 I802_DEBUG_INC(tx->local->
581 tx_handlers_drop_wep);
582 return TXRX_DROP;
583 }
584 }
585 }
586
587 return TXRX_CONTINUE;
588}
589
590static ieee80211_txrx_result
591ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
592{
593 struct rate_control_extra extra;
594
595 memset(&extra, 0, sizeof(extra));
596 extra.mode = tx->u.tx.mode;
597 extra.mgmt_data = tx->sdata &&
598 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
599 extra.ethertype = tx->ethertype;
600
601 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
602 &extra);
603 if (unlikely(extra.probe != NULL)) {
604 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
badffb72 605 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 606 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
607 tx->u.tx.rate = extra.probe;
608 } else {
609 tx->u.tx.control->alt_retry_rate = -1;
610 }
611 if (!tx->u.tx.rate)
612 return TXRX_DROP;
613 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
13262ffd 614 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
badffb72 615 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
e2ebc74d 616 tx->u.tx.last_frag_rate = tx->u.tx.rate;
badffb72
JS		 617 if (extra.probe)
618 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
619 else
620 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 621 tx->u.tx.rate = extra.nonerp;
622 tx->u.tx.control->rate = extra.nonerp;
623 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
624 } else {
625 tx->u.tx.last_frag_rate = tx->u.tx.rate;
626 tx->u.tx.control->rate = tx->u.tx.rate;
627 }
628 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
e2ebc74d
JB		 629
630 return TXRX_CONTINUE;
631}
632
633static ieee80211_txrx_result
634ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
635{
636 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
7e9ed188 637 u16 fc = le16_to_cpu(hdr->frame_control);
e2ebc74d
JB		 638 u16 dur;
639 struct ieee80211_tx_control *control = tx->u.tx.control;
640 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
641
642 if (!is_multicast_ether_addr(hdr->addr1)) {
643 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
644 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
645 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
d5d08def 646 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
e2ebc74d
JB		 647 control->retry_limit =
648 tx->local->long_retry_limit;
649 } else {
650 control->retry_limit =
651 tx->local->short_retry_limit;
652 }
653 } else {
654 control->retry_limit = 1;
655 }
656
badffb72 657 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
e2ebc74d
JB		 658 /* Do not use multiple retry rates when sending fragmented
659 * frames.
660 * TODO: The last fragment could still use multiple retry
661 * rates. */
662 control->alt_retry_rate = -1;
663 }
664
665 /* Use CTS protection for unicast frames sent using extended rates if
666 * there are associated non-ERP stations and RTS/CTS is not configured
667 * for the frame. */
668 if (mode->mode == MODE_IEEE80211G &&
669 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
badffb72 670 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
13262ffd 671 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
e2ebc74d
JB		 672 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
673 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
674
7e9ed188
DD		 675 /* Transmit data frames using short preambles if the driver supports
676 * short preambles at the selected rate and short preambles are
677 * available on the network at the current point in time. */
678 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
679 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
13262ffd 680 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
7e9ed188
DD		 681 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
682 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
683 }
684
e2ebc74d
JB		 685 /* Setup duration field for the first fragment of the frame. Duration
686 * for remaining fragments will be updated when they are being sent
687 * to low-level driver in ieee80211_tx(). */
688 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
badffb72
JS		 689 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
690 tx->u.tx.extra_frag[0]->len : 0);
e2ebc74d
JB		 691 hdr->duration_id = cpu_to_le16(dur);
692
693 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
694 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
695 struct ieee80211_rate *rate;
696
697 /* Do not use multiple retry rates when using RTS/CTS */
698 control->alt_retry_rate = -1;
699
700 /* Use min(data rate, max base rate) as CTS/RTS rate */
701 rate = tx->u.tx.rate;
702 while (rate > mode->rates &&
703 !(rate->flags & IEEE80211_RATE_BASIC))
704 rate--;
705
706 control->rts_cts_rate = rate->val;
707 control->rts_rate = rate;
708 }
709
710 if (tx->sta) {
711 tx->sta->tx_packets++;
712 tx->sta->tx_fragments++;
713 tx->sta->tx_bytes += tx->skb->len;
714 if (tx->u.tx.extra_frag) {
715 int i;
716 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
717 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
718 tx->sta->tx_bytes +=
719 tx->u.tx.extra_frag[i]->len;
720 }
721 }
722 }
723
724 return TXRX_CONTINUE;
725}
726
727static ieee80211_txrx_result
728ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
729{
730 struct ieee80211_local *local = tx->local;
731 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
732 struct sk_buff *skb = tx->skb;
733 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
734 u32 load = 0, hdrtime;
735
736 /* TODO: this could be part of tx_status handling, so that the number
737 * of retries would be known; TX rate should in that case be stored
738 * somewhere with the packet */
739
740 /* Estimate total channel use caused by this frame */
741
742 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
743 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
744
745 if (mode->mode == MODE_IEEE80211A ||
746 mode->mode == MODE_ATHEROS_TURBO ||
747 mode->mode == MODE_ATHEROS_TURBOG ||
748 (mode->mode == MODE_IEEE80211G &&
749 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
750 hdrtime = CHAN_UTIL_HDR_SHORT;
751 else
752 hdrtime = CHAN_UTIL_HDR_LONG;
753
754 load = hdrtime;
755 if (!is_multicast_ether_addr(hdr->addr1))
756 load += hdrtime;
757
758 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
759 load += 2 * hdrtime;
760 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
761 load += hdrtime;
762
763 load += skb->len * tx->u.tx.rate->rate_inv;
764
765 if (tx->u.tx.extra_frag) {
766 int i;
767 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
768 load += 2 * hdrtime;
769 load += tx->u.tx.extra_frag[i]->len *
770 tx->u.tx.rate->rate;
771 }
772 }
773
774 /* Divide channel_use by 8 to avoid wrapping around the counter */
775 load >>= CHAN_UTIL_SHIFT;
776 local->channel_use_raw += load;
777 if (tx->sta)
778 tx->sta->channel_use_raw += load;
779 tx->sdata->channel_use_raw += load;
780
781 return TXRX_CONTINUE;
782}
783
784/* TODO: implement register/unregister functions for adding TX/RX handlers
785 * into ordered list */
786
787ieee80211_tx_handler ieee80211_tx_handlers[] =
788{
789 ieee80211_tx_h_check_assoc,
790 ieee80211_tx_h_sequence,
791 ieee80211_tx_h_ps_buf,
792 ieee80211_tx_h_select_key,
793 ieee80211_tx_h_michael_mic_add,
794 ieee80211_tx_h_fragment,
795 ieee80211_tx_h_tkip_encrypt,
796 ieee80211_tx_h_ccmp_encrypt,
797 ieee80211_tx_h_wep_encrypt,
798 ieee80211_tx_h_rate_ctrl,
799 ieee80211_tx_h_misc,
800 ieee80211_tx_h_load_stats,
801 NULL
802};
803
804/* actual transmit path */
805
806/*
807 * deal with packet injection down monitor interface
808 * with Radiotap Header -- only called for monitor mode interface
809 */
810static ieee80211_txrx_result
811__ieee80211_parse_tx_radiotap(
812 struct ieee80211_txrx_data *tx,
813 struct sk_buff *skb, struct ieee80211_tx_control *control)
814{
815 /*
816 * this is the moment to interpret and discard the radiotap header that
817 * must be at the start of the packet injected in Monitor mode
818 *
819 * Need to take some care with endian-ness since radiotap
820 * args are little-endian
821 */
822
823 struct ieee80211_radiotap_iterator iterator;
824 struct ieee80211_radiotap_header *rthdr =
825 (struct ieee80211_radiotap_header *) skb->data;
826 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
827 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
828
829 /*
830 * default control situation for all injected packets
831 * FIXME: this does not suit all usage cases, expand to allow control
832 */
833
834 control->retry_limit = 1; /* no retry */
835 control->key_idx = -1; /* no encryption key */
836 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
837 IEEE80211_TXCTL_USE_CTS_PROTECT);
838 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
839 IEEE80211_TXCTL_NO_ACK;
840 control->antenna_sel_tx = 0; /* default to default antenna */
841
842 /*
843 * for every radiotap entry that is present
844 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
845 * entries present, or -EINVAL on error)
846 */
847
848 while (!ret) {
849 int i, target_rate;
850
851 ret = ieee80211_radiotap_iterator_next(&iterator);
852
853 if (ret)
854 continue;
855
856 /* see if this argument is something we can use */
857 switch (iterator.this_arg_index) {
858 /*
859 * You must take care when dereferencing iterator.this_arg
860 * for multibyte types... the pointer is not aligned. Use
861 * get_unaligned((type *)iterator.this_arg) to dereference
862 * iterator.this_arg for type "type" safely on all arches.
863 */
864 case IEEE80211_RADIOTAP_RATE:
865 /*
866 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
867 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
868 */
869 target_rate = (*iterator.this_arg) * 5;
870 for (i = 0; i < mode->num_rates; i++) {
871 struct ieee80211_rate *r = &mode->rates[i];
872
873 if (r->rate > target_rate)
874 continue;
875
876 control->rate = r;
877
878 if (r->flags & IEEE80211_RATE_PREAMBLE2)
879 control->tx_rate = r->val2;
880 else
881 control->tx_rate = r->val;
882
883 /* end on exact match */
884 if (r->rate == target_rate)
885 i = mode->num_rates;
886 }
887 break;
888
889 case IEEE80211_RADIOTAP_ANTENNA:
890 /*
891 * radiotap uses 0 for 1st ant, mac80211 is 1 for
892 * 1st ant
893 */
894 control->antenna_sel_tx = (*iterator.this_arg) + 1;
895 break;
896
897 case IEEE80211_RADIOTAP_DBM_TX_POWER:
898 control->power_level = *iterator.this_arg;
899 break;
900
901 case IEEE80211_RADIOTAP_FLAGS:
902 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
903 /*
904 * this indicates that the skb we have been
905 * handed has the 32-bit FCS CRC at the end...
906 * we should react to that by snipping it off
907 * because it will be recomputed and added
908 * on transmission
909 */
910 if (skb->len < (iterator.max_length + FCS_LEN))
911 return TXRX_DROP;
912
913 skb_trim(skb, skb->len - FCS_LEN);
914 }
915 break;
916
917 default:
918 break;
919 }
920 }
921
922 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
923 return TXRX_DROP;
924
925 /*
926 * remove the radiotap header
927 * iterator->max_length was sanity-checked against
928 * skb->len by iterator init
929 */
930 skb_pull(skb, iterator.max_length);
931
932 return TXRX_CONTINUE;
933}
934
935static ieee80211_txrx_result inline
936__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
937 struct sk_buff *skb,
938 struct net_device *dev,
939 struct ieee80211_tx_control *control)
940{
941 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
942 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
943 struct ieee80211_sub_if_data *sdata;
944 ieee80211_txrx_result res = TXRX_CONTINUE;
945
946 int hdrlen;
947
948 memset(tx, 0, sizeof(*tx));
949 tx->skb = skb;
950 tx->dev = dev; /* use original interface */
951 tx->local = local;
952 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
953 tx->sta = sta_info_get(local, hdr->addr1);
954 tx->fc = le16_to_cpu(hdr->frame_control);
955
956 /*
957 * set defaults for things that can be set by
958 * injected radiotap headers
959 */
960 control->power_level = local->hw.conf.power_level;
961 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
e2ebc74d
JB		 962
963 /* process and remove the injection radiotap header */
964 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
965 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
966 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
967 TXRX_DROP) {
968 return TXRX_DROP;
969 }
970 /*
971 * we removed the radiotap header after this point,
972 * we filled control with what we could use
973 * set to the actual ieee header now
974 */
975 hdr = (struct ieee80211_hdr *) skb->data;
976 res = TXRX_QUEUED; /* indication it was monitor packet */
977 }
978
979 tx->u.tx.control = control;
badffb72
JS		 980 if (is_multicast_ether_addr(hdr->addr1)) {
981 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 982 control->flags |= IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 983 } else {
984 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 985 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 986 }
987 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
988 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
989 skb->len + FCS_LEN > local->fragmentation_threshold &&
990 !local->ops->set_frag_threshold)
991 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
992 else
993 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 994 if (!tx->sta)
995 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
996 else if (tx->sta->clear_dst_mask) {
997 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
998 tx->sta->clear_dst_mask = 0;
999 }
1000 hdrlen = ieee80211_get_hdrlen(tx->fc);
1001 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1002 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1003 tx->ethertype = (pos[0] << 8) | pos[1];
1004 }
1005 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1006
1007 return res;
1008}
1009
1010/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1011 * finished with it. */
1012static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1013 struct sk_buff *skb,
1014 struct net_device *mdev,
1015 struct ieee80211_tx_control *control)
1016{
1017 struct ieee80211_tx_packet_data *pkt_data;
1018 struct net_device *dev;
1019
1020 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1021 dev = dev_get_by_index(pkt_data->ifindex);
1022 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1023 dev_put(dev);
1024 dev = NULL;
1025 }
1026 if (unlikely(!dev))
1027 return -ENODEV;
1028 __ieee80211_tx_prepare(tx, skb, dev, control);
1029 return 0;
1030}
1031
1032static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1033 struct ieee80211_txrx_data *tx)
1034{
1035 struct ieee80211_tx_control *control = tx->u.tx.control;
1036 int ret, i;
1037
1038 if (!ieee80211_qdisc_installed(local->mdev) &&
1039 __ieee80211_queue_stopped(local, 0)) {
1040 netif_stop_queue(local->mdev);
1041 return IEEE80211_TX_AGAIN;
1042 }
1043 if (skb) {
1044 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1045 ret = local->ops->tx(local_to_hw(local), skb, control);
1046 if (ret)
1047 return IEEE80211_TX_AGAIN;
1048 local->mdev->trans_start = jiffies;
1049 ieee80211_led_tx(local, 1);
1050 }
1051 if (tx->u.tx.extra_frag) {
1052 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1053 IEEE80211_TXCTL_USE_CTS_PROTECT |
1054 IEEE80211_TXCTL_CLEAR_DST_MASK |
1055 IEEE80211_TXCTL_FIRST_FRAGMENT);
1056 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1057 if (!tx->u.tx.extra_frag[i])
1058 continue;
1059 if (__ieee80211_queue_stopped(local, control->queue))
1060 return IEEE80211_TX_FRAG_AGAIN;
1061 if (i == tx->u.tx.num_extra_frag) {
1062 control->tx_rate = tx->u.tx.last_frag_hwrate;
1063 control->rate = tx->u.tx.last_frag_rate;
badffb72 1064 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
e2ebc74d
JB		 1065 control->flags |=
1066 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1067 else
1068 control->flags &=
1069 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1070 }
1071
1072 ieee80211_dump_frame(local->mdev->name,
1073 "TX to low-level driver",
1074 tx->u.tx.extra_frag[i]);
1075 ret = local->ops->tx(local_to_hw(local),
1076 tx->u.tx.extra_frag[i],
1077 control);
1078 if (ret)
1079 return IEEE80211_TX_FRAG_AGAIN;
1080 local->mdev->trans_start = jiffies;
1081 ieee80211_led_tx(local, 1);
1082 tx->u.tx.extra_frag[i] = NULL;
1083 }
1084 kfree(tx->u.tx.extra_frag);
1085 tx->u.tx.extra_frag = NULL;
1086 }
1087 return IEEE80211_TX_OK;
1088}
1089
1090static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1091 struct ieee80211_tx_control *control, int mgmt)
1092{
1093 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1094 struct sta_info *sta;
1095 ieee80211_tx_handler *handler;
1096 struct ieee80211_txrx_data tx;
1097 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1098 int ret, i;
1099
1100 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1101
1102 if (unlikely(skb->len < 10)) {
1103 dev_kfree_skb(skb);
1104 return 0;
1105 }
1106
1107 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1108
1109 if (res_prepare == TXRX_DROP) {
1110 dev_kfree_skb(skb);
1111 return 0;
1112 }
1113
1114 sta = tx.sta;
1115 tx.u.tx.mgmt_interface = mgmt;
1116 tx.u.tx.mode = local->hw.conf.mode;
1117
1118 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1119 res = TXRX_CONTINUE;
1120 } else {
1121 for (handler = local->tx_handlers; *handler != NULL;
1122 handler++) {
1123 res = (*handler)(&tx);
1124 if (res != TXRX_CONTINUE)
1125 break;
1126 }
1127 }
1128
1129 skb = tx.skb; /* handlers are allowed to change skb */
1130
1131 if (sta)
1132 sta_info_put(sta);
1133
1134 if (unlikely(res == TXRX_DROP)) {
1135 I802_DEBUG_INC(local->tx_handlers_drop);
1136 goto drop;
1137 }
1138
1139 if (unlikely(res == TXRX_QUEUED)) {
1140 I802_DEBUG_INC(local->tx_handlers_queued);
1141 return 0;
1142 }
1143
1144 if (tx.u.tx.extra_frag) {
1145 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1146 int next_len, dur;
1147 struct ieee80211_hdr *hdr =
1148 (struct ieee80211_hdr *)
1149 tx.u.tx.extra_frag[i]->data;
1150
1151 if (i + 1 < tx.u.tx.num_extra_frag) {
1152 next_len = tx.u.tx.extra_frag[i + 1]->len;
1153 } else {
1154 next_len = 0;
1155 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1156 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1157 }
1158 dur = ieee80211_duration(&tx, 0, next_len);
1159 hdr->duration_id = cpu_to_le16(dur);
1160 }
1161 }
1162
1163retry:
1164 ret = __ieee80211_tx(local, skb, &tx);
1165 if (ret) {
1166 struct ieee80211_tx_stored_packet *store =
1167 &local->pending_packet[control->queue];
1168
1169 if (ret == IEEE80211_TX_FRAG_AGAIN)
1170 skb = NULL;
1171 set_bit(IEEE80211_LINK_STATE_PENDING,
1172 &local->state[control->queue]);
1173 smp_mb();
1174 /* When the driver gets out of buffers during sending of
1175 * fragments and calls ieee80211_stop_queue, there is
1176 * a small window between IEEE80211_LINK_STATE_XOFF and
1177 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1178 * gets available in that window (i.e. driver calls
1179 * ieee80211_wake_queue), we would end up with ieee80211_tx
1180 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1181 * continuing transmitting here when that situation is
1182 * possible to have happened. */
1183 if (!__ieee80211_queue_stopped(local, control->queue)) {
1184 clear_bit(IEEE80211_LINK_STATE_PENDING,
1185 &local->state[control->queue]);
1186 goto retry;
1187 }
1188 memcpy(&store->control, control,
1189 sizeof(struct ieee80211_tx_control));
1190 store->skb = skb;
1191 store->extra_frag = tx.u.tx.extra_frag;
1192 store->num_extra_frag = tx.u.tx.num_extra_frag;
1193 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1194 store->last_frag_rate = tx.u.tx.last_frag_rate;
badffb72
JS		 1195 store->last_frag_rate_ctrl_probe =
1196 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
e2ebc74d
JB		 1197 }
1198 return 0;
1199
1200 drop:
1201 if (skb)
1202 dev_kfree_skb(skb);
1203 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1204 if (tx.u.tx.extra_frag[i])
1205 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1206 kfree(tx.u.tx.extra_frag);
1207 return 0;
1208}
1209
1210/* device xmit handlers */
1211
1212int ieee80211_master_start_xmit(struct sk_buff *skb,
1213 struct net_device *dev)
1214{
1215 struct ieee80211_tx_control control;
1216 struct ieee80211_tx_packet_data *pkt_data;
1217 struct net_device *odev = NULL;
1218 struct ieee80211_sub_if_data *osdata;
1219 int headroom;
1220 int ret;
1221
1222 /*
1223 * copy control out of the skb so other people can use skb->cb
1224 */
1225 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1226 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1227
1228 if (pkt_data->ifindex)
1229 odev = dev_get_by_index(pkt_data->ifindex);
1230 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1231 dev_put(odev);
1232 odev = NULL;
1233 }
1234 if (unlikely(!odev)) {
1235#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1236 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1237 "originating device\n", dev->name);
1238#endif
1239 dev_kfree_skb(skb);
1240 return 0;
1241 }
1242 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1243
1244 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1245 if (skb_headroom(skb) < headroom) {
1246 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1247 dev_kfree_skb(skb);
1248 dev_put(odev);
1249 return 0;
1250 }
1251 }
1252
1253 control.ifindex = odev->ifindex;
1254 control.type = osdata->type;
e8bf9649 1255 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
e2ebc74d 1256 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
e8bf9649 1257 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
e2ebc74d 1258 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
e8bf9649 1259 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
e2ebc74d
JB		 1260 control.flags |= IEEE80211_TXCTL_REQUEUE;
1261 control.queue = pkt_data->queue;
1262
1263 ret = ieee80211_tx(odev, skb, &control,
1264 control.type == IEEE80211_IF_TYPE_MGMT);
1265 dev_put(odev);
1266
1267 return ret;
1268}
1269
1270int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1271 struct net_device *dev)
1272{
1273 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1274 struct ieee80211_tx_packet_data *pkt_data;
1275 struct ieee80211_radiotap_header *prthdr =
1276 (struct ieee80211_radiotap_header *)skb->data;
9b8a74e3 1277 u16 len_rthdr;
e2ebc74d 1278
9b8a74e3
AG		 1279 /* check for not even having the fixed radiotap header part */
1280 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1281 goto fail; /* too short to be possibly valid */
1282
1283 /* is it a header version we can trust to find length from? */
1284 if (unlikely(prthdr->it_version))
1285 goto fail; /* only version 0 is supported */
1286
1287 /* then there must be a radiotap header with a length we can use */
1288 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1289
1290 /* does the skb contain enough to deliver on the alleged length? */
1291 if (unlikely(skb->len < len_rthdr))
1292 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d
JB		 1293
1294 skb->dev = local->mdev;
1295
1296 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1297 memset(pkt_data, 0, sizeof(*pkt_data));
9b8a74e3 1298 /* needed because we set skb device to master */
e2ebc74d 1299 pkt_data->ifindex = dev->ifindex;
9b8a74e3 1300
e8bf9649 1301 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d 1302
e2ebc74d
JB		 1303 /*
1304 * fix up the pointers accounting for the radiotap
1305 * header still being in there. We are being given
1306 * a precooked IEEE80211 header so no need for
1307 * normal processing
1308 */
9b8a74e3 1309 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1310 /*
9b8a74e3
AG		 1311 * these are just fixed to the end of the rt area since we
1312 * don't have any better information and at this point, nobody cares
e2ebc74d 1313 */
9b8a74e3
AG		 1314 skb_set_network_header(skb, len_rthdr);
1315 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1316
9b8a74e3
AG		 1317 /* pass the radiotap header up to the next stage intact */
1318 dev_queue_xmit(skb);
e2ebc74d 1319 return NETDEV_TX_OK;
9b8a74e3
AG		 1320
1321fail:
1322 dev_kfree_skb(skb);
1323 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1324}
1325
1326/**
1327 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1328 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1329 * @skb: packet to be sent
1330 * @dev: incoming interface
1331 *
1332 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1333 * not be freed, and caller is responsible for either retrying later or freeing
1334 * skb).
1335 *
1336 * This function takes in an Ethernet header and encapsulates it with suitable
1337 * IEEE 802.11 header based on which interface the packet is coming in. The
1338 * encapsulated packet will then be passed to master interface, wlan#.11, for
1339 * transmission (through low-level driver).
1340 */
1341int ieee80211_subif_start_xmit(struct sk_buff *skb,
1342 struct net_device *dev)
1343{
1344 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1345 struct ieee80211_tx_packet_data *pkt_data;
1346 struct ieee80211_sub_if_data *sdata;
1347 int ret = 1, head_need;
1348 u16 ethertype, hdrlen, fc;
1349 struct ieee80211_hdr hdr;
1350 const u8 *encaps_data;
1351 int encaps_len, skip_header_bytes;
e8bf9649 1352 int nh_pos, h_pos;
e2ebc74d
JB		 1353 struct sta_info *sta;
1354
1355 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1356 if (unlikely(skb->len < ETH_HLEN)) {
1357 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1358 dev->name, skb->len);
1359 ret = 0;
1360 goto fail;
1361 }
1362
1363 nh_pos = skb_network_header(skb) - skb->data;
1364 h_pos = skb_transport_header(skb) - skb->data;
1365
1366 /* convert Ethernet header to proper 802.11 header (based on
1367 * operation mode) */
1368 ethertype = (skb->data[12] << 8) | skb->data[13];
1369 /* TODO: handling for 802.1x authorized/unauthorized port */
1370 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1371
cf966838
JB		 1372 switch (sdata->type) {
1373 case IEEE80211_IF_TYPE_AP:
1374 case IEEE80211_IF_TYPE_VLAN:
e2ebc74d
JB		 1375 fc |= IEEE80211_FCTL_FROMDS;
1376 /* DA BSSID SA */
1377 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1378 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1379 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1380 hdrlen = 24;
cf966838
JB		 1381 break;
1382 case IEEE80211_IF_TYPE_WDS:
e2ebc74d
JB		 1383 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1384 /* RA TA DA SA */
1385 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1386 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1387 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1388 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1389 hdrlen = 30;
cf966838
JB		 1390 break;
1391 case IEEE80211_IF_TYPE_STA:
e2ebc74d
JB		 1392 fc |= IEEE80211_FCTL_TODS;
1393 /* BSSID SA DA */
1394 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1395 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1396 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1397 hdrlen = 24;
cf966838
JB		 1398 break;
1399 case IEEE80211_IF_TYPE_IBSS:
e2ebc74d
JB		 1400 /* DA SA BSSID */
1401 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1402 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1403 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1404 hdrlen = 24;
cf966838
JB		 1405 break;
1406 default:
e2ebc74d
JB		 1407 ret = 0;
1408 goto fail;
1409 }
1410
1411 /* receiver is QoS enabled, use a QoS type frame */
1412 sta = sta_info_get(local, hdr.addr1);
1413 if (sta) {
1414 if (sta->flags & WLAN_STA_WME) {
1415 fc |= IEEE80211_STYPE_QOS_DATA;
1416 hdrlen += 2;
1417 }
1418 sta_info_put(sta);
1419 }
1420
1421 hdr.frame_control = cpu_to_le16(fc);
1422 hdr.duration_id = 0;
1423 hdr.seq_ctrl = 0;
1424
1425 skip_header_bytes = ETH_HLEN;
1426 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1427 encaps_data = bridge_tunnel_header;
1428 encaps_len = sizeof(bridge_tunnel_header);
1429 skip_header_bytes -= 2;
1430 } else if (ethertype >= 0x600) {
1431 encaps_data = rfc1042_header;
1432 encaps_len = sizeof(rfc1042_header);
1433 skip_header_bytes -= 2;
1434 } else {
1435 encaps_data = NULL;
1436 encaps_len = 0;
1437 }
1438
1439 skb_pull(skb, skip_header_bytes);
1440 nh_pos -= skip_header_bytes;
1441 h_pos -= skip_header_bytes;
1442
1443 /* TODO: implement support for fragments so that there is no need to
1444 * reallocate and copy payload; it might be enough to support one
1445 * extra fragment that would be copied in the beginning of the frame
1446 * data.. anyway, it would be nice to include this into skb structure
1447 * somehow
1448 *
1449 * There are few options for this:
1450 * use skb->cb as an extra space for 802.11 header
1451 * allocate new buffer if not enough headroom
1452 * make sure that there is enough headroom in every skb by increasing
1453 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1454 * alloc_skb() (net/core/skbuff.c)
1455 */
1456 head_need = hdrlen + encaps_len + local->tx_headroom;
1457 head_need -= skb_headroom(skb);
1458
1459 /* We are going to modify skb data, so make a copy of it if happens to
1460 * be cloned. This could happen, e.g., with Linux bridge code passing
1461 * us broadcast frames. */
1462
1463 if (head_need > 0 || skb_cloned(skb)) {
1464#if 0
1465 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1466 "of headroom\n", dev->name, head_need);
1467#endif
1468
1469 if (skb_cloned(skb))
1470 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1471 else
1472 I802_DEBUG_INC(local->tx_expand_skb_head);
1473 /* Since we have to reallocate the buffer, make sure that there
1474 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1475 * before payload and 12 after). */
1476 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1477 12, GFP_ATOMIC)) {
1478 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1479 "\n", dev->name);
1480 goto fail;
1481 }
1482 }
1483
1484 if (encaps_data) {
1485 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1486 nh_pos += encaps_len;
1487 h_pos += encaps_len;
1488 }
1489 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1490 nh_pos += hdrlen;
1491 h_pos += hdrlen;
1492
1493 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1494 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1495 pkt_data->ifindex = dev->ifindex;
e8bf9649
JS		 1496 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1497 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
e2ebc74d
JB		 1498
1499 skb->dev = local->mdev;
1500 sdata->stats.tx_packets++;
1501 sdata->stats.tx_bytes += skb->len;
1502
1503 /* Update skb pointers to various headers since this modified frame
1504 * is going to go through Linux networking code that may potentially
1505 * need things like pointer to IP header. */
1506 skb_set_mac_header(skb, 0);
1507 skb_set_network_header(skb, nh_pos);
1508 skb_set_transport_header(skb, h_pos);
1509
1510 dev->trans_start = jiffies;
1511 dev_queue_xmit(skb);
1512
1513 return 0;
1514
1515 fail:
1516 if (!ret)
1517 dev_kfree_skb(skb);
1518
1519 return ret;
1520}
1521
1522/*
1523 * This is the transmit routine for the 802.11 type interfaces
1524 * called by upper layers of the linux networking
1525 * stack when it has a frame to transmit
1526 */
1527int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1528{
1529 struct ieee80211_sub_if_data *sdata;
1530 struct ieee80211_tx_packet_data *pkt_data;
1531 struct ieee80211_hdr *hdr;
1532 u16 fc;
1533
1534 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1535
1536 if (skb->len < 10) {
1537 dev_kfree_skb(skb);
1538 return 0;
1539 }
1540
1541 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1542 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1543 0, GFP_ATOMIC)) {
1544 dev_kfree_skb(skb);
1545 return 0;
1546 }
1547 }
1548
1549 hdr = (struct ieee80211_hdr *) skb->data;
1550 fc = le16_to_cpu(hdr->frame_control);
1551
1552 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1553 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1554 pkt_data->ifindex = sdata->dev->ifindex;
e8bf9649
JS		 1555 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1556 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
e2ebc74d
JB		 1557
1558 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1559 skb->dev = sdata->local->mdev;
1560
1561 /*
1562 * We're using the protocol field of the the frame control header
1563 * to request TX callback for hostapd. BIT(1) is checked.
1564 */
1565 if ((fc & BIT(1)) == BIT(1)) {
e8bf9649 1566 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
e2ebc74d
JB		 1567 fc &= ~BIT(1);
1568 hdr->frame_control = cpu_to_le16(fc);
1569 }
1570
e8bf9649
JS		 1571 if (!(fc & IEEE80211_FCTL_PROTECTED))
1572 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d
JB		 1573
1574 sdata->stats.tx_packets++;
1575 sdata->stats.tx_bytes += skb->len;
1576
1577 dev_queue_xmit(skb);
1578
1579 return 0;
1580}
1581
1582/* helper functions for pending packets for when queues are stopped */
1583
1584void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1585{
1586 int i, j;
1587 struct ieee80211_tx_stored_packet *store;
1588
1589 for (i = 0; i < local->hw.queues; i++) {
1590 if (!__ieee80211_queue_pending(local, i))
1591 continue;
1592 store = &local->pending_packet[i];
1593 kfree_skb(store->skb);
1594 for (j = 0; j < store->num_extra_frag; j++)
1595 kfree_skb(store->extra_frag[j]);
1596 kfree(store->extra_frag);
1597 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1598 }
1599}
1600
1601void ieee80211_tx_pending(unsigned long data)
1602{
1603 struct ieee80211_local *local = (struct ieee80211_local *)data;
1604 struct net_device *dev = local->mdev;
1605 struct ieee80211_tx_stored_packet *store;
1606 struct ieee80211_txrx_data tx;
1607 int i, ret, reschedule = 0;
1608
1609 netif_tx_lock_bh(dev);
1610 for (i = 0; i < local->hw.queues; i++) {
1611 if (__ieee80211_queue_stopped(local, i))
1612 continue;
1613 if (!__ieee80211_queue_pending(local, i)) {
1614 reschedule = 1;
1615 continue;
1616 }
1617 store = &local->pending_packet[i];
1618 tx.u.tx.control = &store->control;
1619 tx.u.tx.extra_frag = store->extra_frag;
1620 tx.u.tx.num_extra_frag = store->num_extra_frag;
1621 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1622 tx.u.tx.last_frag_rate = store->last_frag_rate;
badffb72
JS		 1623 tx.flags = 0;
1624 if (store->last_frag_rate_ctrl_probe)
1625 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 1626 ret = __ieee80211_tx(local, store->skb, &tx);
1627 if (ret) {
1628 if (ret == IEEE80211_TX_FRAG_AGAIN)
1629 store->skb = NULL;
1630 } else {
1631 clear_bit(IEEE80211_LINK_STATE_PENDING,
1632 &local->state[i]);
1633 reschedule = 1;
1634 }
1635 }
1636 netif_tx_unlock_bh(dev);
1637 if (reschedule) {
1638 if (!ieee80211_qdisc_installed(dev)) {
1639 if (!__ieee80211_queue_stopped(local, 0))
1640 netif_wake_queue(dev);
1641 } else
1642 netif_schedule(dev);
1643 }
1644}
1645
1646/* functions for drivers to get certain frames */
1647
1648static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1649 struct ieee80211_if_ap *bss,
1650 struct sk_buff *skb)
1651{
1652 u8 *pos, *tim;
1653 int aid0 = 0;
1654 int i, have_bits = 0, n1, n2;
1655
1656 /* Generate bitmap for TIM only if there are any STAs in power save
1657 * mode. */
be8755e1 1658 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 1659 if (atomic_read(&bss->num_sta_ps) > 0)
1660 /* in the hope that this is faster than
1661 * checking byte-for-byte */
1662 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1663 IEEE80211_MAX_AID+1);
1664
1665 if (bss->dtim_count == 0)
1666 bss->dtim_count = bss->dtim_period - 1;
1667 else
1668 bss->dtim_count--;
1669
1670 tim = pos = (u8 *) skb_put(skb, 6);
1671 *pos++ = WLAN_EID_TIM;
1672 *pos++ = 4;
1673 *pos++ = bss->dtim_count;
1674 *pos++ = bss->dtim_period;
1675
1676 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1677 aid0 = 1;
1678
1679 if (have_bits) {
1680 /* Find largest even number N1 so that bits numbered 1 through
1681 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1682 * (N2 + 1) x 8 through 2007 are 0. */
1683 n1 = 0;
1684 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1685 if (bss->tim[i]) {
1686 n1 = i & 0xfe;
1687 break;
1688 }
1689 }
1690 n2 = n1;
1691 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1692 if (bss->tim[i]) {
1693 n2 = i;
1694 break;
1695 }
1696 }
1697
1698 /* Bitmap control */
1699 *pos++ = n1 | aid0;
1700 /* Part Virt Bitmap */
1701 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1702
1703 tim[1] = n2 - n1 + 4;
1704 skb_put(skb, n2 - n1);
1705 } else {
1706 *pos++ = aid0; /* Bitmap control */
1707 *pos++ = 0; /* Part Virt Bitmap */
1708 }
be8755e1 1709 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 1710}
1711
1712struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1713 struct ieee80211_tx_control *control)
1714{
1715 struct ieee80211_local *local = hw_to_local(hw);
1716 struct sk_buff *skb;
1717 struct net_device *bdev;
1718 struct ieee80211_sub_if_data *sdata = NULL;
1719 struct ieee80211_if_ap *ap = NULL;
1720 struct ieee80211_rate *rate;
1721 struct rate_control_extra extra;
1722 u8 *b_head, *b_tail;
1723 int bh_len, bt_len;
1724
1725 bdev = dev_get_by_index(if_id);
1726 if (bdev) {
1727 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1728 ap = &sdata->u.ap;
1729 dev_put(bdev);
1730 }
1731
1732 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1733 !ap->beacon_head) {
1734#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1735 if (net_ratelimit())
1736 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1737 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1738#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1739 return NULL;
1740 }
1741
1742 /* Assume we are generating the normal beacon locally */
1743 b_head = ap->beacon_head;
1744 b_tail = ap->beacon_tail;
1745 bh_len = ap->beacon_head_len;
1746 bt_len = ap->beacon_tail_len;
1747
1748 skb = dev_alloc_skb(local->tx_headroom +
1749 bh_len + bt_len + 256 /* maximum TIM len */);
1750 if (!skb)
1751 return NULL;
1752
1753 skb_reserve(skb, local->tx_headroom);
1754 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1755
1756 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1757
1758 ieee80211_beacon_add_tim(local, ap, skb);
1759
1760 if (b_tail) {
1761 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1762 }
1763
1764 if (control) {
1765 memset(&extra, 0, sizeof(extra));
1766 extra.mode = local->oper_hw_mode;
1767
1768 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1769 if (!rate) {
1770 if (net_ratelimit()) {
1771 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1772 "found\n", local->mdev->name);
1773 }
1774 dev_kfree_skb(skb);
1775 return NULL;
1776 }
1777
13262ffd
JS		 1778 control->tx_rate =
1779 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1780 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
e2ebc74d
JB		 1781 rate->val2 : rate->val;
1782 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1783 control->power_level = local->hw.conf.power_level;
1784 control->flags |= IEEE80211_TXCTL_NO_ACK;
1785 control->retry_limit = 1;
1786 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1787 }
1788
1789 ap->num_beacons++;
1790 return skb;
1791}
1792EXPORT_SYMBOL(ieee80211_beacon_get);
1793
7e9ed188 1794void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1795 const void *frame, size_t frame_len,
1796 const struct ieee80211_tx_control *frame_txctl,
1797 struct ieee80211_rts *rts)
1798{
1799 const struct ieee80211_hdr *hdr = frame;
1800 u16 fctl;
1801
1802 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1803 rts->frame_control = cpu_to_le16(fctl);
7e9ed188 1804 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1805 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1806 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1807}
1808EXPORT_SYMBOL(ieee80211_rts_get);
1809
7e9ed188 1810void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1811 const void *frame, size_t frame_len,
1812 const struct ieee80211_tx_control *frame_txctl,
1813 struct ieee80211_cts *cts)
1814{
1815 const struct ieee80211_hdr *hdr = frame;
1816 u16 fctl;
1817
1818 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1819 cts->frame_control = cpu_to_le16(fctl);
7e9ed188 1820 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1821 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1822}
1823EXPORT_SYMBOL(ieee80211_ctstoself_get);
1824
1825struct sk_buff *
1826ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1827 struct ieee80211_tx_control *control)
1828{
1829 struct ieee80211_local *local = hw_to_local(hw);
1830 struct sk_buff *skb;
1831 struct sta_info *sta;
1832 ieee80211_tx_handler *handler;
1833 struct ieee80211_txrx_data tx;
1834 ieee80211_txrx_result res = TXRX_DROP;
1835 struct net_device *bdev;
1836 struct ieee80211_sub_if_data *sdata;
1837 struct ieee80211_if_ap *bss = NULL;
1838
1839 bdev = dev_get_by_index(if_id);
1840 if (bdev) {
1841 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1842 bss = &sdata->u.ap;
1843 dev_put(bdev);
1844 }
1845 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1846 return NULL;
1847
1848 if (bss->dtim_count != 0)
1849 return NULL; /* send buffered bc/mc only after DTIM beacon */
1850 memset(control, 0, sizeof(*control));
1851 while (1) {
1852 skb = skb_dequeue(&bss->ps_bc_buf);
1853 if (!skb)
1854 return NULL;
1855 local->total_ps_buffered--;
1856
1857 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1858 struct ieee80211_hdr *hdr =
1859 (struct ieee80211_hdr *) skb->data;
1860 /* more buffered multicast/broadcast frames ==> set
1861 * MoreData flag in IEEE 802.11 header to inform PS
1862 * STAs */
1863 hdr->frame_control |=
1864 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1865 }
1866
1867 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1868 break;
1869 dev_kfree_skb_any(skb);
1870 }
1871 sta = tx.sta;
badffb72 1872 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
e2ebc74d
JB		 1873
1874 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1875 res = (*handler)(&tx);
1876 if (res == TXRX_DROP || res == TXRX_QUEUED)
1877 break;
1878 }
1879 dev_put(tx.dev);
1880 skb = tx.skb; /* handlers are allowed to change skb */
1881
1882 if (res == TXRX_DROP) {
1883 I802_DEBUG_INC(local->tx_handlers_drop);
1884 dev_kfree_skb(skb);
1885 skb = NULL;
1886 } else if (res == TXRX_QUEUED) {
1887 I802_DEBUG_INC(local->tx_handlers_queued);
1888 skb = NULL;
1889 }
1890
1891 if (sta)
1892 sta_info_put(sta);
1893
1894 return skb;
1895}
1896EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux kernel - Deliverables
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