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[NET]: Make the device list and device lookups per namespace.
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
881d966b 20#include <net/net_namespace.h>
e2ebc74d
JB		 21#include <net/ieee80211_radiotap.h>
22#include <net/cfg80211.h>
23#include <net/mac80211.h>
24#include <asm/unaligned.h>
25
26#include "ieee80211_i.h"
27#include "ieee80211_led.h"
28#include "wep.h"
29#include "wpa.h"
30#include "wme.h"
31#include "ieee80211_rate.h"
32
33#define IEEE80211_TX_OK 0
34#define IEEE80211_TX_AGAIN 1
35#define IEEE80211_TX_FRAG_AGAIN 2
36
37/* misc utils */
38
39static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
40 struct ieee80211_hdr *hdr)
41{
42 /* Set the sequence number for this frame. */
43 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
44
45 /* Increase the sequence number. */
46 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
47}
48
49#ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
50static void ieee80211_dump_frame(const char *ifname, const char *title,
51 const struct sk_buff *skb)
52{
53 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
54 u16 fc;
55 int hdrlen;
56
57 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
58 if (skb->len < 4) {
59 printk("\n");
60 return;
61 }
62
63 fc = le16_to_cpu(hdr->frame_control);
64 hdrlen = ieee80211_get_hdrlen(fc);
65 if (hdrlen > skb->len)
66 hdrlen = skb->len;
67 if (hdrlen >= 4)
68 printk(" FC=0x%04x DUR=0x%04x",
69 fc, le16_to_cpu(hdr->duration_id));
70 if (hdrlen >= 10)
71 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
72 if (hdrlen >= 16)
73 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
74 if (hdrlen >= 24)
75 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
76 if (hdrlen >= 30)
77 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
78 printk("\n");
79}
80#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
81static inline void ieee80211_dump_frame(const char *ifname, const char *title,
82 struct sk_buff *skb)
83{
84}
85#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
86
87static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
88 int next_frag_len)
89{
90 int rate, mrate, erp, dur, i;
91 struct ieee80211_rate *txrate = tx->u.tx.rate;
92 struct ieee80211_local *local = tx->local;
93 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
94
95 erp = txrate->flags & IEEE80211_RATE_ERP;
96
97 /*
98 * data and mgmt (except PS Poll):
99 * - during CFP: 32768
100 * - during contention period:
101 * if addr1 is group address: 0
102 * if more fragments = 0 and addr1 is individual address: time to
103 * transmit one ACK plus SIFS
104 * if more fragments = 1 and addr1 is individual address: time to
105 * transmit next fragment plus 2 x ACK plus 3 x SIFS
106 *
107 * IEEE 802.11, 9.6:
108 * - control response frame (CTS or ACK) shall be transmitted using the
109 * same rate as the immediately previous frame in the frame exchange
110 * sequence, if this rate belongs to the PHY mandatory rates, or else
111 * at the highest possible rate belonging to the PHY rates in the
112 * BSSBasicRateSet
113 */
114
115 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
116 /* TODO: These control frames are not currently sent by
117 * 80211.o, but should they be implemented, this function
118 * needs to be updated to support duration field calculation.
119 *
120 * RTS: time needed to transmit pending data/mgmt frame plus
121 * one CTS frame plus one ACK frame plus 3 x SIFS
122 * CTS: duration of immediately previous RTS minus time
123 * required to transmit CTS and its SIFS
124 * ACK: 0 if immediately previous directed data/mgmt had
125 * more=0, with more=1 duration in ACK frame is duration
126 * from previous frame minus time needed to transmit ACK
127 * and its SIFS
128 * PS Poll: BIT(15) | BIT(14) | aid
129 */
130 return 0;
131 }
132
133 /* data/mgmt */
134 if (0 /* FIX: data/mgmt during CFP */)
135 return 32768;
136
137 if (group_addr) /* Group address as the destination - no ACK */
138 return 0;
139
140 /* Individual destination address:
141 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
142 * CTS and ACK frames shall be transmitted using the highest rate in
143 * basic rate set that is less than or equal to the rate of the
144 * immediately previous frame and that is using the same modulation
145 * (CCK or OFDM). If no basic rate set matches with these requirements,
146 * the highest mandatory rate of the PHY that is less than or equal to
147 * the rate of the previous frame is used.
148 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
149 */
150 rate = -1;
151 mrate = 10; /* use 1 Mbps if everything fails */
152 for (i = 0; i < mode->num_rates; i++) {
153 struct ieee80211_rate *r = &mode->rates[i];
154 if (r->rate > txrate->rate)
155 break;
156
157 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
158 IEEE80211_RATE_MODULATION(r->flags))
159 continue;
160
161 if (r->flags & IEEE80211_RATE_BASIC)
162 rate = r->rate;
163 else if (r->flags & IEEE80211_RATE_MANDATORY)
164 mrate = r->rate;
165 }
166 if (rate == -1) {
167 /* No matching basic rate found; use highest suitable mandatory
168 * PHY rate */
169 rate = mrate;
170 }
171
172 /* Time needed to transmit ACK
173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
174 * to closest integer */
175
176 dur = ieee80211_frame_duration(local, 10, rate, erp,
13262ffd 177 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 178
179 if (next_frag_len) {
180 /* Frame is fragmented: duration increases with time needed to
181 * transmit next fragment plus ACK and 2 x SIFS. */
182 dur *= 2; /* ACK + SIFS */
183 /* next fragment */
184 dur += ieee80211_frame_duration(local, next_frag_len,
13262ffd
JS		 185 txrate->rate, erp,
186 tx->sdata->flags &
187 IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 188 }
189
190 return dur;
191}
192
193static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
194 int queue)
195{
196 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
197}
198
199static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
200 int queue)
201{
202 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
203}
204
205static int inline is_ieee80211_device(struct net_device *dev,
206 struct net_device *master)
207{
208 return (wdev_priv(dev->ieee80211_ptr) ==
209 wdev_priv(master->ieee80211_ptr));
210}
211
212/* tx handlers */
213
214static ieee80211_txrx_result
215ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
216{
217#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
218 struct sk_buff *skb = tx->skb;
219 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
220#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
221 u32 sta_flags;
222
223 if (unlikely(tx->local->sta_scanning != 0) &&
224 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
225 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
226 return TXRX_DROP;
227
badffb72 228 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
e2ebc74d
JB		 229 return TXRX_CONTINUE;
230
231 sta_flags = tx->sta ? tx->sta->flags : 0;
232
badffb72 233 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
e2ebc74d
JB		 234 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
235 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
236 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
237#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
238 printk(KERN_DEBUG "%s: dropped data frame to not "
239 "associated station " MAC_FMT "\n",
240 tx->dev->name, MAC_ARG(hdr->addr1));
241#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
242 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
243 return TXRX_DROP;
244 }
245 } else {
246 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
247 tx->local->num_sta == 0 &&
e2ebc74d
JB		 248 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
249 /*
250 * No associated STAs - no need to send multicast
251 * frames.
252 */
253 return TXRX_DROP;
254 }
255 return TXRX_CONTINUE;
256 }
257
258 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
259 !(sta_flags & WLAN_STA_AUTHORIZED))) {
260#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
261 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
262 " (unauthorized port)\n", tx->dev->name,
263 MAC_ARG(hdr->addr1));
264#endif
265 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
266 return TXRX_DROP;
267 }
268
269 return TXRX_CONTINUE;
270}
271
272static ieee80211_txrx_result
273ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
274{
275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
276
277 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
278 ieee80211_include_sequence(tx->sdata, hdr);
279
280 return TXRX_CONTINUE;
281}
282
283/* This function is called whenever the AP is about to exceed the maximum limit
284 * of buffered frames for power saving STAs. This situation should not really
285 * happen often during normal operation, so dropping the oldest buffered packet
286 * from each queue should be OK to make some room for new frames. */
287static void purge_old_ps_buffers(struct ieee80211_local *local)
288{
289 int total = 0, purged = 0;
290 struct sk_buff *skb;
291 struct ieee80211_sub_if_data *sdata;
292 struct sta_info *sta;
293
294 read_lock(&local->sub_if_lock);
295 list_for_each_entry(sdata, &local->sub_if_list, list) {
296 struct ieee80211_if_ap *ap;
297 if (sdata->dev == local->mdev ||
298 sdata->type != IEEE80211_IF_TYPE_AP)
299 continue;
300 ap = &sdata->u.ap;
301 skb = skb_dequeue(&ap->ps_bc_buf);
302 if (skb) {
303 purged++;
304 dev_kfree_skb(skb);
305 }
306 total += skb_queue_len(&ap->ps_bc_buf);
307 }
308 read_unlock(&local->sub_if_lock);
309
be8755e1 310 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 311 list_for_each_entry(sta, &local->sta_list, list) {
312 skb = skb_dequeue(&sta->ps_tx_buf);
313 if (skb) {
314 purged++;
315 dev_kfree_skb(skb);
316 }
317 total += skb_queue_len(&sta->ps_tx_buf);
318 }
be8755e1 319 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 320
321 local->total_ps_buffered = total;
322 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
323 local->mdev->name, purged);
324}
325
326static inline ieee80211_txrx_result
327ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
328{
329 /* broadcast/multicast frame */
330 /* If any of the associated stations is in power save mode,
331 * the frame is buffered to be sent after DTIM beacon frame */
332 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
333 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
334 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
335 !(tx->fc & IEEE80211_FCTL_ORDER)) {
336 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
337 purge_old_ps_buffers(tx->local);
338 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
339 AP_MAX_BC_BUFFER) {
340 if (net_ratelimit()) {
341 printk(KERN_DEBUG "%s: BC TX buffer full - "
342 "dropping the oldest frame\n",
343 tx->dev->name);
344 }
345 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
346 } else
347 tx->local->total_ps_buffered++;
348 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
349 return TXRX_QUEUED;
350 }
351
352 return TXRX_CONTINUE;
353}
354
355static inline ieee80211_txrx_result
356ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
357{
358 struct sta_info *sta = tx->sta;
359
360 if (unlikely(!sta ||
361 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
362 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
363 return TXRX_CONTINUE;
364
365 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
366 struct ieee80211_tx_packet_data *pkt_data;
367#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
368 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
369 "before %d)\n",
370 MAC_ARG(sta->addr), sta->aid,
371 skb_queue_len(&sta->ps_tx_buf));
372#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
373 sta->flags |= WLAN_STA_TIM;
374 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
375 purge_old_ps_buffers(tx->local);
376 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
377 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
378 if (net_ratelimit()) {
379 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
380 "buffer full - dropping oldest frame\n",
381 tx->dev->name, MAC_ARG(sta->addr));
382 }
383 dev_kfree_skb(old);
384 } else
385 tx->local->total_ps_buffered++;
386 /* Queue frame to be sent after STA sends an PS Poll frame */
387 if (skb_queue_empty(&sta->ps_tx_buf)) {
388 if (tx->local->ops->set_tim)
389 tx->local->ops->set_tim(local_to_hw(tx->local),
390 sta->aid, 1);
391 if (tx->sdata->bss)
392 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
393 }
394 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
395 pkt_data->jiffies = jiffies;
396 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
397 return TXRX_QUEUED;
398 }
399#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
400 else if (unlikely(sta->flags & WLAN_STA_PS)) {
401 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
402 "set -> send frame\n", tx->dev->name,
403 MAC_ARG(sta->addr));
404 }
405#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
406 sta->pspoll = 0;
407
408 return TXRX_CONTINUE;
409}
410
411
412static ieee80211_txrx_result
413ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
414{
badffb72 415 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
e2ebc74d
JB		 416 return TXRX_CONTINUE;
417
badffb72 418 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
e2ebc74d
JB		 419 return ieee80211_tx_h_unicast_ps_buf(tx);
420 else
421 return ieee80211_tx_h_multicast_ps_buf(tx);
422}
423
424
425
426
427static ieee80211_txrx_result
428ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
429{
3aefaa32 430 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
e2ebc74d
JB		 431
432 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
433 tx->key = NULL;
434 else if (tx->sta && tx->sta->key)
435 tx->key = tx->sta->key;
436 else if (tx->sdata->default_key)
437 tx->key = tx->sdata->default_key;
438 else if (tx->sdata->drop_unencrypted &&
439 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
440 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
441 return TXRX_DROP;
442 } else
443 tx->key = NULL;
444
445 if (tx->key) {
446 tx->key->tx_rx_count++;
447 if (unlikely(tx->local->key_tx_rx_threshold &&
448 tx->key->tx_rx_count >
449 tx->local->key_tx_rx_threshold)) {
450 ieee80211_key_threshold_notify(tx->dev, tx->key,
451 tx->sta);
452 }
453 }
454
455 return TXRX_CONTINUE;
456}
457
458static ieee80211_txrx_result
459ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
460{
461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
462 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
463 struct sk_buff **frags, *first, *frag;
464 int i;
465 u16 seq;
466 u8 *pos;
467 int frag_threshold = tx->local->fragmentation_threshold;
468
badffb72 469 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
e2ebc74d
JB		 470 return TXRX_CONTINUE;
471
472 first = tx->skb;
473
474 hdrlen = ieee80211_get_hdrlen(tx->fc);
475 payload_len = first->len - hdrlen;
476 per_fragm = frag_threshold - hdrlen - FCS_LEN;
172589cc 477 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
e2ebc74d
JB		 478
479 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
480 if (!frags)
481 goto fail;
482
483 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
484 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
485 pos = first->data + hdrlen + per_fragm;
486 left = payload_len - per_fragm;
487 for (i = 0; i < num_fragm - 1; i++) {
488 struct ieee80211_hdr *fhdr;
489 size_t copylen;
490
491 if (left <= 0)
492 goto fail;
493
494 /* reserve enough extra head and tail room for possible
495 * encryption */
496 frag = frags[i] =
497 dev_alloc_skb(tx->local->tx_headroom +
498 frag_threshold +
499 IEEE80211_ENCRYPT_HEADROOM +
500 IEEE80211_ENCRYPT_TAILROOM);
501 if (!frag)
502 goto fail;
503 /* Make sure that all fragments use the same priority so
504 * that they end up using the same TX queue */
505 frag->priority = first->priority;
506 skb_reserve(frag, tx->local->tx_headroom +
507 IEEE80211_ENCRYPT_HEADROOM);
508 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
509 memcpy(fhdr, first->data, hdrlen);
510 if (i == num_fragm - 2)
511 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
512 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
513 copylen = left > per_fragm ? per_fragm : left;
514 memcpy(skb_put(frag, copylen), pos, copylen);
515
516 pos += copylen;
517 left -= copylen;
518 }
519 skb_trim(first, hdrlen + per_fragm);
520
521 tx->u.tx.num_extra_frag = num_fragm - 1;
522 tx->u.tx.extra_frag = frags;
523
524 return TXRX_CONTINUE;
525
526 fail:
527 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
528 if (frags) {
529 for (i = 0; i < num_fragm - 1; i++)
530 if (frags[i])
531 dev_kfree_skb(frags[i]);
532 kfree(frags);
533 }
534 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
535 return TXRX_DROP;
536}
537
538static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
539{
11a843b7 540 if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
e2ebc74d
JB		 541 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
542 return -1;
543 } else {
8f20fc24 544 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
e2ebc74d
JB		 545 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
546 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
547 NULL)
548 return -1;
549 }
550 }
551 return 0;
552}
553
554static ieee80211_txrx_result
555ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
556{
557 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
558 u16 fc;
559
560 fc = le16_to_cpu(hdr->frame_control);
561
8f20fc24 562 if (!tx->key || tx->key->conf.alg != ALG_WEP ||
e2ebc74d
JB		 563 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
564 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
565 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
566 return TXRX_CONTINUE;
567
568 tx->u.tx.control->iv_len = WEP_IV_LEN;
569 tx->u.tx.control->icv_len = WEP_ICV_LEN;
570 ieee80211_tx_set_iswep(tx);
571
572 if (wep_encrypt_skb(tx, tx->skb) < 0) {
573 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
574 return TXRX_DROP;
575 }
576
577 if (tx->u.tx.extra_frag) {
578 int i;
579 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
580 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
581 I802_DEBUG_INC(tx->local->
582 tx_handlers_drop_wep);
583 return TXRX_DROP;
584 }
585 }
586 }
587
588 return TXRX_CONTINUE;
589}
590
591static ieee80211_txrx_result
592ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
593{
594 struct rate_control_extra extra;
595
596 memset(&extra, 0, sizeof(extra));
597 extra.mode = tx->u.tx.mode;
598 extra.mgmt_data = tx->sdata &&
599 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
600 extra.ethertype = tx->ethertype;
601
602 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
603 &extra);
604 if (unlikely(extra.probe != NULL)) {
605 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
badffb72 606 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 607 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
608 tx->u.tx.rate = extra.probe;
609 } else {
610 tx->u.tx.control->alt_retry_rate = -1;
611 }
612 if (!tx->u.tx.rate)
613 return TXRX_DROP;
614 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
13262ffd 615 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
badffb72 616 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
e2ebc74d 617 tx->u.tx.last_frag_rate = tx->u.tx.rate;
badffb72
JS		 618 if (extra.probe)
619 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
620 else
621 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 622 tx->u.tx.rate = extra.nonerp;
623 tx->u.tx.control->rate = extra.nonerp;
624 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
625 } else {
626 tx->u.tx.last_frag_rate = tx->u.tx.rate;
627 tx->u.tx.control->rate = tx->u.tx.rate;
628 }
629 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
e2ebc74d
JB		 630
631 return TXRX_CONTINUE;
632}
633
634static ieee80211_txrx_result
635ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
636{
637 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
7e9ed188 638 u16 fc = le16_to_cpu(hdr->frame_control);
e2ebc74d
JB		 639 u16 dur;
640 struct ieee80211_tx_control *control = tx->u.tx.control;
641 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
642
643 if (!is_multicast_ether_addr(hdr->addr1)) {
644 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
645 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
646 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
d5d08def 647 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
e2ebc74d
JB		 648 control->retry_limit =
649 tx->local->long_retry_limit;
650 } else {
651 control->retry_limit =
652 tx->local->short_retry_limit;
653 }
654 } else {
655 control->retry_limit = 1;
656 }
657
badffb72 658 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
e2ebc74d
JB		 659 /* Do not use multiple retry rates when sending fragmented
660 * frames.
661 * TODO: The last fragment could still use multiple retry
662 * rates. */
663 control->alt_retry_rate = -1;
664 }
665
666 /* Use CTS protection for unicast frames sent using extended rates if
667 * there are associated non-ERP stations and RTS/CTS is not configured
668 * for the frame. */
669 if (mode->mode == MODE_IEEE80211G &&
670 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
badffb72 671 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
13262ffd 672 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
e2ebc74d
JB		 673 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
674 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
675
7e9ed188
DD		 676 /* Transmit data frames using short preambles if the driver supports
677 * short preambles at the selected rate and short preambles are
678 * available on the network at the current point in time. */
679 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
680 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
13262ffd 681 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
7e9ed188
DD		 682 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
683 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
684 }
685
e2ebc74d
JB		 686 /* Setup duration field for the first fragment of the frame. Duration
687 * for remaining fragments will be updated when they are being sent
688 * to low-level driver in ieee80211_tx(). */
689 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
badffb72
JS		 690 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
691 tx->u.tx.extra_frag[0]->len : 0);
e2ebc74d
JB		 692 hdr->duration_id = cpu_to_le16(dur);
693
694 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
695 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
696 struct ieee80211_rate *rate;
697
698 /* Do not use multiple retry rates when using RTS/CTS */
699 control->alt_retry_rate = -1;
700
701 /* Use min(data rate, max base rate) as CTS/RTS rate */
702 rate = tx->u.tx.rate;
703 while (rate > mode->rates &&
704 !(rate->flags & IEEE80211_RATE_BASIC))
705 rate--;
706
707 control->rts_cts_rate = rate->val;
708 control->rts_rate = rate;
709 }
710
711 if (tx->sta) {
712 tx->sta->tx_packets++;
713 tx->sta->tx_fragments++;
714 tx->sta->tx_bytes += tx->skb->len;
715 if (tx->u.tx.extra_frag) {
716 int i;
717 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
718 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
719 tx->sta->tx_bytes +=
720 tx->u.tx.extra_frag[i]->len;
721 }
722 }
723 }
724
725 return TXRX_CONTINUE;
726}
727
728static ieee80211_txrx_result
729ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
730{
731 struct ieee80211_local *local = tx->local;
732 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
733 struct sk_buff *skb = tx->skb;
734 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
735 u32 load = 0, hdrtime;
736
737 /* TODO: this could be part of tx_status handling, so that the number
738 * of retries would be known; TX rate should in that case be stored
739 * somewhere with the packet */
740
741 /* Estimate total channel use caused by this frame */
742
743 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
744 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
745
746 if (mode->mode == MODE_IEEE80211A ||
747 mode->mode == MODE_ATHEROS_TURBO ||
748 mode->mode == MODE_ATHEROS_TURBOG ||
749 (mode->mode == MODE_IEEE80211G &&
750 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
751 hdrtime = CHAN_UTIL_HDR_SHORT;
752 else
753 hdrtime = CHAN_UTIL_HDR_LONG;
754
755 load = hdrtime;
756 if (!is_multicast_ether_addr(hdr->addr1))
757 load += hdrtime;
758
759 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
760 load += 2 * hdrtime;
761 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
762 load += hdrtime;
763
764 load += skb->len * tx->u.tx.rate->rate_inv;
765
766 if (tx->u.tx.extra_frag) {
767 int i;
768 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
769 load += 2 * hdrtime;
770 load += tx->u.tx.extra_frag[i]->len *
771 tx->u.tx.rate->rate;
772 }
773 }
774
775 /* Divide channel_use by 8 to avoid wrapping around the counter */
776 load >>= CHAN_UTIL_SHIFT;
777 local->channel_use_raw += load;
778 if (tx->sta)
779 tx->sta->channel_use_raw += load;
780 tx->sdata->channel_use_raw += load;
781
782 return TXRX_CONTINUE;
783}
784
785/* TODO: implement register/unregister functions for adding TX/RX handlers
786 * into ordered list */
787
788ieee80211_tx_handler ieee80211_tx_handlers[] =
789{
790 ieee80211_tx_h_check_assoc,
791 ieee80211_tx_h_sequence,
792 ieee80211_tx_h_ps_buf,
793 ieee80211_tx_h_select_key,
794 ieee80211_tx_h_michael_mic_add,
795 ieee80211_tx_h_fragment,
796 ieee80211_tx_h_tkip_encrypt,
797 ieee80211_tx_h_ccmp_encrypt,
798 ieee80211_tx_h_wep_encrypt,
799 ieee80211_tx_h_rate_ctrl,
800 ieee80211_tx_h_misc,
801 ieee80211_tx_h_load_stats,
802 NULL
803};
804
805/* actual transmit path */
806
807/*
808 * deal with packet injection down monitor interface
809 * with Radiotap Header -- only called for monitor mode interface
810 */
811static ieee80211_txrx_result
812__ieee80211_parse_tx_radiotap(
813 struct ieee80211_txrx_data *tx,
814 struct sk_buff *skb, struct ieee80211_tx_control *control)
815{
816 /*
817 * this is the moment to interpret and discard the radiotap header that
818 * must be at the start of the packet injected in Monitor mode
819 *
820 * Need to take some care with endian-ness since radiotap
821 * args are little-endian
822 */
823
824 struct ieee80211_radiotap_iterator iterator;
825 struct ieee80211_radiotap_header *rthdr =
826 (struct ieee80211_radiotap_header *) skb->data;
827 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
828 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
829
830 /*
831 * default control situation for all injected packets
832 * FIXME: this does not suit all usage cases, expand to allow control
833 */
834
835 control->retry_limit = 1; /* no retry */
11a843b7 836 control->key_idx = HW_KEY_IDX_INVALID;
e2ebc74d
JB		 837 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
838 IEEE80211_TXCTL_USE_CTS_PROTECT);
839 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
840 IEEE80211_TXCTL_NO_ACK;
841 control->antenna_sel_tx = 0; /* default to default antenna */
842
843 /*
844 * for every radiotap entry that is present
845 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
846 * entries present, or -EINVAL on error)
847 */
848
849 while (!ret) {
850 int i, target_rate;
851
852 ret = ieee80211_radiotap_iterator_next(&iterator);
853
854 if (ret)
855 continue;
856
857 /* see if this argument is something we can use */
858 switch (iterator.this_arg_index) {
859 /*
860 * You must take care when dereferencing iterator.this_arg
861 * for multibyte types... the pointer is not aligned. Use
862 * get_unaligned((type *)iterator.this_arg) to dereference
863 * iterator.this_arg for type "type" safely on all arches.
864 */
865 case IEEE80211_RADIOTAP_RATE:
866 /*
867 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
868 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
869 */
870 target_rate = (*iterator.this_arg) * 5;
871 for (i = 0; i < mode->num_rates; i++) {
872 struct ieee80211_rate *r = &mode->rates[i];
873
874 if (r->rate > target_rate)
875 continue;
876
877 control->rate = r;
878
879 if (r->flags & IEEE80211_RATE_PREAMBLE2)
880 control->tx_rate = r->val2;
881 else
882 control->tx_rate = r->val;
883
884 /* end on exact match */
885 if (r->rate == target_rate)
886 i = mode->num_rates;
887 }
888 break;
889
890 case IEEE80211_RADIOTAP_ANTENNA:
891 /*
892 * radiotap uses 0 for 1st ant, mac80211 is 1 for
893 * 1st ant
894 */
895 control->antenna_sel_tx = (*iterator.this_arg) + 1;
896 break;
897
898 case IEEE80211_RADIOTAP_DBM_TX_POWER:
899 control->power_level = *iterator.this_arg;
900 break;
901
902 case IEEE80211_RADIOTAP_FLAGS:
903 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
904 /*
905 * this indicates that the skb we have been
906 * handed has the 32-bit FCS CRC at the end...
907 * we should react to that by snipping it off
908 * because it will be recomputed and added
909 * on transmission
910 */
911 if (skb->len < (iterator.max_length + FCS_LEN))
912 return TXRX_DROP;
913
914 skb_trim(skb, skb->len - FCS_LEN);
915 }
916 break;
917
918 default:
919 break;
920 }
921 }
922
923 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
924 return TXRX_DROP;
925
926 /*
927 * remove the radiotap header
928 * iterator->max_length was sanity-checked against
929 * skb->len by iterator init
930 */
931 skb_pull(skb, iterator.max_length);
932
933 return TXRX_CONTINUE;
934}
935
936static ieee80211_txrx_result inline
937__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
938 struct sk_buff *skb,
939 struct net_device *dev,
940 struct ieee80211_tx_control *control)
941{
942 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
944 struct ieee80211_sub_if_data *sdata;
945 ieee80211_txrx_result res = TXRX_CONTINUE;
946
947 int hdrlen;
948
949 memset(tx, 0, sizeof(*tx));
950 tx->skb = skb;
951 tx->dev = dev; /* use original interface */
952 tx->local = local;
953 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
954 tx->sta = sta_info_get(local, hdr->addr1);
955 tx->fc = le16_to_cpu(hdr->frame_control);
956
957 /*
958 * set defaults for things that can be set by
959 * injected radiotap headers
960 */
961 control->power_level = local->hw.conf.power_level;
962 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
e2ebc74d
JB		 963
964 /* process and remove the injection radiotap header */
965 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
966 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
967 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
968 TXRX_DROP) {
969 return TXRX_DROP;
970 }
971 /*
972 * we removed the radiotap header after this point,
973 * we filled control with what we could use
974 * set to the actual ieee header now
975 */
976 hdr = (struct ieee80211_hdr *) skb->data;
977 res = TXRX_QUEUED; /* indication it was monitor packet */
978 }
979
980 tx->u.tx.control = control;
badffb72
JS		 981 if (is_multicast_ether_addr(hdr->addr1)) {
982 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 983 control->flags |= IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 984 } else {
985 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 986 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 987 }
988 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
989 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
990 skb->len + FCS_LEN > local->fragmentation_threshold &&
991 !local->ops->set_frag_threshold)
992 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
993 else
994 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 995 if (!tx->sta)
996 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
997 else if (tx->sta->clear_dst_mask) {
998 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
999 tx->sta->clear_dst_mask = 0;
1000 }
1001 hdrlen = ieee80211_get_hdrlen(tx->fc);
1002 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1003 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1004 tx->ethertype = (pos[0] << 8) | pos[1];
1005 }
1006 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1007
1008 return res;
1009}
1010
1011/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1012 * finished with it. */
1013static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1014 struct sk_buff *skb,
1015 struct net_device *mdev,
1016 struct ieee80211_tx_control *control)
1017{
1018 struct ieee80211_tx_packet_data *pkt_data;
1019 struct net_device *dev;
1020
1021 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
881d966b 1022 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 1023 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1024 dev_put(dev);
1025 dev = NULL;
1026 }
1027 if (unlikely(!dev))
1028 return -ENODEV;
1029 __ieee80211_tx_prepare(tx, skb, dev, control);
1030 return 0;
1031}
1032
1033static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1034 struct ieee80211_txrx_data *tx)
1035{
1036 struct ieee80211_tx_control *control = tx->u.tx.control;
1037 int ret, i;
1038
1039 if (!ieee80211_qdisc_installed(local->mdev) &&
1040 __ieee80211_queue_stopped(local, 0)) {
1041 netif_stop_queue(local->mdev);
1042 return IEEE80211_TX_AGAIN;
1043 }
1044 if (skb) {
1045 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1046 ret = local->ops->tx(local_to_hw(local), skb, control);
1047 if (ret)
1048 return IEEE80211_TX_AGAIN;
1049 local->mdev->trans_start = jiffies;
1050 ieee80211_led_tx(local, 1);
1051 }
1052 if (tx->u.tx.extra_frag) {
1053 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1054 IEEE80211_TXCTL_USE_CTS_PROTECT |
1055 IEEE80211_TXCTL_CLEAR_DST_MASK |
1056 IEEE80211_TXCTL_FIRST_FRAGMENT);
1057 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1058 if (!tx->u.tx.extra_frag[i])
1059 continue;
1060 if (__ieee80211_queue_stopped(local, control->queue))
1061 return IEEE80211_TX_FRAG_AGAIN;
1062 if (i == tx->u.tx.num_extra_frag) {
1063 control->tx_rate = tx->u.tx.last_frag_hwrate;
1064 control->rate = tx->u.tx.last_frag_rate;
badffb72 1065 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
e2ebc74d
JB		 1066 control->flags |=
1067 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1068 else
1069 control->flags &=
1070 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1071 }
1072
1073 ieee80211_dump_frame(local->mdev->name,
1074 "TX to low-level driver",
1075 tx->u.tx.extra_frag[i]);
1076 ret = local->ops->tx(local_to_hw(local),
1077 tx->u.tx.extra_frag[i],
1078 control);
1079 if (ret)
1080 return IEEE80211_TX_FRAG_AGAIN;
1081 local->mdev->trans_start = jiffies;
1082 ieee80211_led_tx(local, 1);
1083 tx->u.tx.extra_frag[i] = NULL;
1084 }
1085 kfree(tx->u.tx.extra_frag);
1086 tx->u.tx.extra_frag = NULL;
1087 }
1088 return IEEE80211_TX_OK;
1089}
1090
1091static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1092 struct ieee80211_tx_control *control, int mgmt)
1093{
1094 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1095 struct sta_info *sta;
1096 ieee80211_tx_handler *handler;
1097 struct ieee80211_txrx_data tx;
1098 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1099 int ret, i;
1100
1101 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1102
1103 if (unlikely(skb->len < 10)) {
1104 dev_kfree_skb(skb);
1105 return 0;
1106 }
1107
1108 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1109
1110 if (res_prepare == TXRX_DROP) {
1111 dev_kfree_skb(skb);
1112 return 0;
1113 }
1114
1115 sta = tx.sta;
1116 tx.u.tx.mgmt_interface = mgmt;
1117 tx.u.tx.mode = local->hw.conf.mode;
1118
1119 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1120 res = TXRX_CONTINUE;
1121 } else {
1122 for (handler = local->tx_handlers; *handler != NULL;
1123 handler++) {
1124 res = (*handler)(&tx);
1125 if (res != TXRX_CONTINUE)
1126 break;
1127 }
1128 }
1129
1130 skb = tx.skb; /* handlers are allowed to change skb */
1131
1132 if (sta)
1133 sta_info_put(sta);
1134
1135 if (unlikely(res == TXRX_DROP)) {
1136 I802_DEBUG_INC(local->tx_handlers_drop);
1137 goto drop;
1138 }
1139
1140 if (unlikely(res == TXRX_QUEUED)) {
1141 I802_DEBUG_INC(local->tx_handlers_queued);
1142 return 0;
1143 }
1144
1145 if (tx.u.tx.extra_frag) {
1146 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1147 int next_len, dur;
1148 struct ieee80211_hdr *hdr =
1149 (struct ieee80211_hdr *)
1150 tx.u.tx.extra_frag[i]->data;
1151
1152 if (i + 1 < tx.u.tx.num_extra_frag) {
1153 next_len = tx.u.tx.extra_frag[i + 1]->len;
1154 } else {
1155 next_len = 0;
1156 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1157 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1158 }
1159 dur = ieee80211_duration(&tx, 0, next_len);
1160 hdr->duration_id = cpu_to_le16(dur);
1161 }
1162 }
1163
1164retry:
1165 ret = __ieee80211_tx(local, skb, &tx);
1166 if (ret) {
1167 struct ieee80211_tx_stored_packet *store =
1168 &local->pending_packet[control->queue];
1169
1170 if (ret == IEEE80211_TX_FRAG_AGAIN)
1171 skb = NULL;
1172 set_bit(IEEE80211_LINK_STATE_PENDING,
1173 &local->state[control->queue]);
1174 smp_mb();
1175 /* When the driver gets out of buffers during sending of
1176 * fragments and calls ieee80211_stop_queue, there is
1177 * a small window between IEEE80211_LINK_STATE_XOFF and
1178 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1179 * gets available in that window (i.e. driver calls
1180 * ieee80211_wake_queue), we would end up with ieee80211_tx
1181 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1182 * continuing transmitting here when that situation is
1183 * possible to have happened. */
1184 if (!__ieee80211_queue_stopped(local, control->queue)) {
1185 clear_bit(IEEE80211_LINK_STATE_PENDING,
1186 &local->state[control->queue]);
1187 goto retry;
1188 }
1189 memcpy(&store->control, control,
1190 sizeof(struct ieee80211_tx_control));
1191 store->skb = skb;
1192 store->extra_frag = tx.u.tx.extra_frag;
1193 store->num_extra_frag = tx.u.tx.num_extra_frag;
1194 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1195 store->last_frag_rate = tx.u.tx.last_frag_rate;
badffb72
JS		 1196 store->last_frag_rate_ctrl_probe =
1197 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
e2ebc74d
JB		 1198 }
1199 return 0;
1200
1201 drop:
1202 if (skb)
1203 dev_kfree_skb(skb);
1204 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1205 if (tx.u.tx.extra_frag[i])
1206 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1207 kfree(tx.u.tx.extra_frag);
1208 return 0;
1209}
1210
1211/* device xmit handlers */
1212
1213int ieee80211_master_start_xmit(struct sk_buff *skb,
1214 struct net_device *dev)
1215{
1216 struct ieee80211_tx_control control;
1217 struct ieee80211_tx_packet_data *pkt_data;
1218 struct net_device *odev = NULL;
1219 struct ieee80211_sub_if_data *osdata;
1220 int headroom;
1221 int ret;
1222
1223 /*
1224 * copy control out of the skb so other people can use skb->cb
1225 */
1226 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1227 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1228
1229 if (pkt_data->ifindex)
881d966b 1230 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 1231 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1232 dev_put(odev);
1233 odev = NULL;
1234 }
1235 if (unlikely(!odev)) {
1236#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1237 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1238 "originating device\n", dev->name);
1239#endif
1240 dev_kfree_skb(skb);
1241 return 0;
1242 }
1243 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1244
1245 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1246 if (skb_headroom(skb) < headroom) {
1247 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1248 dev_kfree_skb(skb);
1249 dev_put(odev);
1250 return 0;
1251 }
1252 }
1253
1254 control.ifindex = odev->ifindex;
1255 control.type = osdata->type;
e8bf9649 1256 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
e2ebc74d 1257 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
e8bf9649 1258 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
e2ebc74d 1259 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
e8bf9649 1260 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
e2ebc74d
JB		 1261 control.flags |= IEEE80211_TXCTL_REQUEUE;
1262 control.queue = pkt_data->queue;
1263
1264 ret = ieee80211_tx(odev, skb, &control,
1265 control.type == IEEE80211_IF_TYPE_MGMT);
1266 dev_put(odev);
1267
1268 return ret;
1269}
1270
1271int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1272 struct net_device *dev)
1273{
1274 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1275 struct ieee80211_tx_packet_data *pkt_data;
1276 struct ieee80211_radiotap_header *prthdr =
1277 (struct ieee80211_radiotap_header *)skb->data;
9b8a74e3 1278 u16 len_rthdr;
e2ebc74d 1279
9b8a74e3
AG		 1280 /* check for not even having the fixed radiotap header part */
1281 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1282 goto fail; /* too short to be possibly valid */
1283
1284 /* is it a header version we can trust to find length from? */
1285 if (unlikely(prthdr->it_version))
1286 goto fail; /* only version 0 is supported */
1287
1288 /* then there must be a radiotap header with a length we can use */
1289 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1290
1291 /* does the skb contain enough to deliver on the alleged length? */
1292 if (unlikely(skb->len < len_rthdr))
1293 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d
JB		 1294
1295 skb->dev = local->mdev;
1296
1297 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1298 memset(pkt_data, 0, sizeof(*pkt_data));
9b8a74e3 1299 /* needed because we set skb device to master */
e2ebc74d 1300 pkt_data->ifindex = dev->ifindex;
9b8a74e3 1301
e8bf9649 1302 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d 1303
e2ebc74d
JB		 1304 /*
1305 * fix up the pointers accounting for the radiotap
1306 * header still being in there. We are being given
1307 * a precooked IEEE80211 header so no need for
1308 * normal processing
1309 */
9b8a74e3 1310 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1311 /*
9b8a74e3
AG		 1312 * these are just fixed to the end of the rt area since we
1313 * don't have any better information and at this point, nobody cares
e2ebc74d 1314 */
9b8a74e3
AG		 1315 skb_set_network_header(skb, len_rthdr);
1316 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1317
9b8a74e3
AG		 1318 /* pass the radiotap header up to the next stage intact */
1319 dev_queue_xmit(skb);
e2ebc74d 1320 return NETDEV_TX_OK;
9b8a74e3
AG		 1321
1322fail:
1323 dev_kfree_skb(skb);
1324 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1325}
1326
1327/**
1328 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1329 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1330 * @skb: packet to be sent
1331 * @dev: incoming interface
1332 *
1333 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1334 * not be freed, and caller is responsible for either retrying later or freeing
1335 * skb).
1336 *
1337 * This function takes in an Ethernet header and encapsulates it with suitable
1338 * IEEE 802.11 header based on which interface the packet is coming in. The
1339 * encapsulated packet will then be passed to master interface, wlan#.11, for
1340 * transmission (through low-level driver).
1341 */
1342int ieee80211_subif_start_xmit(struct sk_buff *skb,
1343 struct net_device *dev)
1344{
1345 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1346 struct ieee80211_tx_packet_data *pkt_data;
1347 struct ieee80211_sub_if_data *sdata;
1348 int ret = 1, head_need;
1349 u16 ethertype, hdrlen, fc;
1350 struct ieee80211_hdr hdr;
1351 const u8 *encaps_data;
1352 int encaps_len, skip_header_bytes;
e8bf9649 1353 int nh_pos, h_pos;
e2ebc74d
JB		 1354 struct sta_info *sta;
1355
1356 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1357 if (unlikely(skb->len < ETH_HLEN)) {
1358 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1359 dev->name, skb->len);
1360 ret = 0;
1361 goto fail;
1362 }
1363
1364 nh_pos = skb_network_header(skb) - skb->data;
1365 h_pos = skb_transport_header(skb) - skb->data;
1366
1367 /* convert Ethernet header to proper 802.11 header (based on
1368 * operation mode) */
1369 ethertype = (skb->data[12] << 8) | skb->data[13];
1370 /* TODO: handling for 802.1x authorized/unauthorized port */
1371 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1372
cf966838
JB		 1373 switch (sdata->type) {
1374 case IEEE80211_IF_TYPE_AP:
1375 case IEEE80211_IF_TYPE_VLAN:
e2ebc74d
JB		 1376 fc |= IEEE80211_FCTL_FROMDS;
1377 /* DA BSSID SA */
1378 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1379 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1380 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1381 hdrlen = 24;
cf966838
JB		 1382 break;
1383 case IEEE80211_IF_TYPE_WDS:
e2ebc74d
JB		 1384 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1385 /* RA TA DA SA */
1386 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1387 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1388 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1389 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1390 hdrlen = 30;
cf966838
JB		 1391 break;
1392 case IEEE80211_IF_TYPE_STA:
e2ebc74d
JB		 1393 fc |= IEEE80211_FCTL_TODS;
1394 /* BSSID SA DA */
1395 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1396 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1397 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1398 hdrlen = 24;
cf966838
JB		 1399 break;
1400 case IEEE80211_IF_TYPE_IBSS:
e2ebc74d
JB		 1401 /* DA SA BSSID */
1402 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1403 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1404 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1405 hdrlen = 24;
cf966838
JB		 1406 break;
1407 default:
e2ebc74d
JB		 1408 ret = 0;
1409 goto fail;
1410 }
1411
1412 /* receiver is QoS enabled, use a QoS type frame */
1413 sta = sta_info_get(local, hdr.addr1);
1414 if (sta) {
1415 if (sta->flags & WLAN_STA_WME) {
1416 fc |= IEEE80211_STYPE_QOS_DATA;
1417 hdrlen += 2;
1418 }
1419 sta_info_put(sta);
1420 }
1421
1422 hdr.frame_control = cpu_to_le16(fc);
1423 hdr.duration_id = 0;
1424 hdr.seq_ctrl = 0;
1425
1426 skip_header_bytes = ETH_HLEN;
1427 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1428 encaps_data = bridge_tunnel_header;
1429 encaps_len = sizeof(bridge_tunnel_header);
1430 skip_header_bytes -= 2;
1431 } else if (ethertype >= 0x600) {
1432 encaps_data = rfc1042_header;
1433 encaps_len = sizeof(rfc1042_header);
1434 skip_header_bytes -= 2;
1435 } else {
1436 encaps_data = NULL;
1437 encaps_len = 0;
1438 }
1439
1440 skb_pull(skb, skip_header_bytes);
1441 nh_pos -= skip_header_bytes;
1442 h_pos -= skip_header_bytes;
1443
1444 /* TODO: implement support for fragments so that there is no need to
1445 * reallocate and copy payload; it might be enough to support one
1446 * extra fragment that would be copied in the beginning of the frame
1447 * data.. anyway, it would be nice to include this into skb structure
1448 * somehow
1449 *
1450 * There are few options for this:
1451 * use skb->cb as an extra space for 802.11 header
1452 * allocate new buffer if not enough headroom
1453 * make sure that there is enough headroom in every skb by increasing
1454 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1455 * alloc_skb() (net/core/skbuff.c)
1456 */
1457 head_need = hdrlen + encaps_len + local->tx_headroom;
1458 head_need -= skb_headroom(skb);
1459
1460 /* We are going to modify skb data, so make a copy of it if happens to
1461 * be cloned. This could happen, e.g., with Linux bridge code passing
1462 * us broadcast frames. */
1463
1464 if (head_need > 0 || skb_cloned(skb)) {
1465#if 0
1466 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1467 "of headroom\n", dev->name, head_need);
1468#endif
1469
1470 if (skb_cloned(skb))
1471 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1472 else
1473 I802_DEBUG_INC(local->tx_expand_skb_head);
1474 /* Since we have to reallocate the buffer, make sure that there
1475 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1476 * before payload and 12 after). */
1477 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1478 12, GFP_ATOMIC)) {
1479 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1480 "\n", dev->name);
1481 goto fail;
1482 }
1483 }
1484
1485 if (encaps_data) {
1486 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1487 nh_pos += encaps_len;
1488 h_pos += encaps_len;
1489 }
1490 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1491 nh_pos += hdrlen;
1492 h_pos += hdrlen;
1493
1494 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1495 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1496 pkt_data->ifindex = dev->ifindex;
e8bf9649
JS		 1497 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1498 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
e2ebc74d
JB		 1499
1500 skb->dev = local->mdev;
1501 sdata->stats.tx_packets++;
1502 sdata->stats.tx_bytes += skb->len;
1503
1504 /* Update skb pointers to various headers since this modified frame
1505 * is going to go through Linux networking code that may potentially
1506 * need things like pointer to IP header. */
1507 skb_set_mac_header(skb, 0);
1508 skb_set_network_header(skb, nh_pos);
1509 skb_set_transport_header(skb, h_pos);
1510
1511 dev->trans_start = jiffies;
1512 dev_queue_xmit(skb);
1513
1514 return 0;
1515
1516 fail:
1517 if (!ret)
1518 dev_kfree_skb(skb);
1519
1520 return ret;
1521}
1522
1523/*
1524 * This is the transmit routine for the 802.11 type interfaces
1525 * called by upper layers of the linux networking
1526 * stack when it has a frame to transmit
1527 */
1528int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1529{
1530 struct ieee80211_sub_if_data *sdata;
1531 struct ieee80211_tx_packet_data *pkt_data;
1532 struct ieee80211_hdr *hdr;
1533 u16 fc;
1534
1535 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1536
1537 if (skb->len < 10) {
1538 dev_kfree_skb(skb);
1539 return 0;
1540 }
1541
1542 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1543 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1544 0, GFP_ATOMIC)) {
1545 dev_kfree_skb(skb);
1546 return 0;
1547 }
1548 }
1549
1550 hdr = (struct ieee80211_hdr *) skb->data;
1551 fc = le16_to_cpu(hdr->frame_control);
1552
1553 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1554 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1555 pkt_data->ifindex = sdata->dev->ifindex;
e8bf9649
JS		 1556 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1557 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
e2ebc74d
JB		 1558
1559 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1560 skb->dev = sdata->local->mdev;
1561
1562 /*
1563 * We're using the protocol field of the the frame control header
1564 * to request TX callback for hostapd. BIT(1) is checked.
1565 */
1566 if ((fc & BIT(1)) == BIT(1)) {
e8bf9649 1567 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
e2ebc74d
JB		 1568 fc &= ~BIT(1);
1569 hdr->frame_control = cpu_to_le16(fc);
1570 }
1571
e8bf9649
JS		 1572 if (!(fc & IEEE80211_FCTL_PROTECTED))
1573 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d
JB		 1574
1575 sdata->stats.tx_packets++;
1576 sdata->stats.tx_bytes += skb->len;
1577
1578 dev_queue_xmit(skb);
1579
1580 return 0;
1581}
1582
1583/* helper functions for pending packets for when queues are stopped */
1584
1585void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1586{
1587 int i, j;
1588 struct ieee80211_tx_stored_packet *store;
1589
1590 for (i = 0; i < local->hw.queues; i++) {
1591 if (!__ieee80211_queue_pending(local, i))
1592 continue;
1593 store = &local->pending_packet[i];
1594 kfree_skb(store->skb);
1595 for (j = 0; j < store->num_extra_frag; j++)
1596 kfree_skb(store->extra_frag[j]);
1597 kfree(store->extra_frag);
1598 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1599 }
1600}
1601
1602void ieee80211_tx_pending(unsigned long data)
1603{
1604 struct ieee80211_local *local = (struct ieee80211_local *)data;
1605 struct net_device *dev = local->mdev;
1606 struct ieee80211_tx_stored_packet *store;
1607 struct ieee80211_txrx_data tx;
1608 int i, ret, reschedule = 0;
1609
1610 netif_tx_lock_bh(dev);
1611 for (i = 0; i < local->hw.queues; i++) {
1612 if (__ieee80211_queue_stopped(local, i))
1613 continue;
1614 if (!__ieee80211_queue_pending(local, i)) {
1615 reschedule = 1;
1616 continue;
1617 }
1618 store = &local->pending_packet[i];
1619 tx.u.tx.control = &store->control;
1620 tx.u.tx.extra_frag = store->extra_frag;
1621 tx.u.tx.num_extra_frag = store->num_extra_frag;
1622 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1623 tx.u.tx.last_frag_rate = store->last_frag_rate;
badffb72
JS		 1624 tx.flags = 0;
1625 if (store->last_frag_rate_ctrl_probe)
1626 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 1627 ret = __ieee80211_tx(local, store->skb, &tx);
1628 if (ret) {
1629 if (ret == IEEE80211_TX_FRAG_AGAIN)
1630 store->skb = NULL;
1631 } else {
1632 clear_bit(IEEE80211_LINK_STATE_PENDING,
1633 &local->state[i]);
1634 reschedule = 1;
1635 }
1636 }
1637 netif_tx_unlock_bh(dev);
1638 if (reschedule) {
1639 if (!ieee80211_qdisc_installed(dev)) {
1640 if (!__ieee80211_queue_stopped(local, 0))
1641 netif_wake_queue(dev);
1642 } else
1643 netif_schedule(dev);
1644 }
1645}
1646
1647/* functions for drivers to get certain frames */
1648
1649static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1650 struct ieee80211_if_ap *bss,
1651 struct sk_buff *skb)
1652{
1653 u8 *pos, *tim;
1654 int aid0 = 0;
1655 int i, have_bits = 0, n1, n2;
1656
1657 /* Generate bitmap for TIM only if there are any STAs in power save
1658 * mode. */
be8755e1 1659 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 1660 if (atomic_read(&bss->num_sta_ps) > 0)
1661 /* in the hope that this is faster than
1662 * checking byte-for-byte */
1663 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1664 IEEE80211_MAX_AID+1);
1665
1666 if (bss->dtim_count == 0)
1667 bss->dtim_count = bss->dtim_period - 1;
1668 else
1669 bss->dtim_count--;
1670
1671 tim = pos = (u8 *) skb_put(skb, 6);
1672 *pos++ = WLAN_EID_TIM;
1673 *pos++ = 4;
1674 *pos++ = bss->dtim_count;
1675 *pos++ = bss->dtim_period;
1676
1677 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1678 aid0 = 1;
1679
1680 if (have_bits) {
1681 /* Find largest even number N1 so that bits numbered 1 through
1682 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1683 * (N2 + 1) x 8 through 2007 are 0. */
1684 n1 = 0;
1685 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1686 if (bss->tim[i]) {
1687 n1 = i & 0xfe;
1688 break;
1689 }
1690 }
1691 n2 = n1;
1692 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1693 if (bss->tim[i]) {
1694 n2 = i;
1695 break;
1696 }
1697 }
1698
1699 /* Bitmap control */
1700 *pos++ = n1 | aid0;
1701 /* Part Virt Bitmap */
1702 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1703
1704 tim[1] = n2 - n1 + 4;
1705 skb_put(skb, n2 - n1);
1706 } else {
1707 *pos++ = aid0; /* Bitmap control */
1708 *pos++ = 0; /* Part Virt Bitmap */
1709 }
be8755e1 1710 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 1711}
1712
1713struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1714 struct ieee80211_tx_control *control)
1715{
1716 struct ieee80211_local *local = hw_to_local(hw);
1717 struct sk_buff *skb;
1718 struct net_device *bdev;
1719 struct ieee80211_sub_if_data *sdata = NULL;
1720 struct ieee80211_if_ap *ap = NULL;
1721 struct ieee80211_rate *rate;
1722 struct rate_control_extra extra;
1723 u8 *b_head, *b_tail;
1724 int bh_len, bt_len;
1725
881d966b 1726 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1727 if (bdev) {
1728 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1729 ap = &sdata->u.ap;
1730 dev_put(bdev);
1731 }
1732
1733 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1734 !ap->beacon_head) {
1735#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1736 if (net_ratelimit())
1737 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1738 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1739#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1740 return NULL;
1741 }
1742
1743 /* Assume we are generating the normal beacon locally */
1744 b_head = ap->beacon_head;
1745 b_tail = ap->beacon_tail;
1746 bh_len = ap->beacon_head_len;
1747 bt_len = ap->beacon_tail_len;
1748
1749 skb = dev_alloc_skb(local->tx_headroom +
1750 bh_len + bt_len + 256 /* maximum TIM len */);
1751 if (!skb)
1752 return NULL;
1753
1754 skb_reserve(skb, local->tx_headroom);
1755 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1756
1757 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1758
1759 ieee80211_beacon_add_tim(local, ap, skb);
1760
1761 if (b_tail) {
1762 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1763 }
1764
1765 if (control) {
1766 memset(&extra, 0, sizeof(extra));
1767 extra.mode = local->oper_hw_mode;
1768
1769 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1770 if (!rate) {
1771 if (net_ratelimit()) {
1772 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1773 "found\n", local->mdev->name);
1774 }
1775 dev_kfree_skb(skb);
1776 return NULL;
1777 }
1778
13262ffd
JS		 1779 control->tx_rate =
1780 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1781 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
e2ebc74d
JB		 1782 rate->val2 : rate->val;
1783 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1784 control->power_level = local->hw.conf.power_level;
1785 control->flags |= IEEE80211_TXCTL_NO_ACK;
1786 control->retry_limit = 1;
1787 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1788 }
1789
1790 ap->num_beacons++;
1791 return skb;
1792}
1793EXPORT_SYMBOL(ieee80211_beacon_get);
1794
7e9ed188 1795void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1796 const void *frame, size_t frame_len,
1797 const struct ieee80211_tx_control *frame_txctl,
1798 struct ieee80211_rts *rts)
1799{
1800 const struct ieee80211_hdr *hdr = frame;
1801 u16 fctl;
1802
1803 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1804 rts->frame_control = cpu_to_le16(fctl);
7e9ed188 1805 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1806 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1807 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1808}
1809EXPORT_SYMBOL(ieee80211_rts_get);
1810
7e9ed188 1811void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1812 const void *frame, size_t frame_len,
1813 const struct ieee80211_tx_control *frame_txctl,
1814 struct ieee80211_cts *cts)
1815{
1816 const struct ieee80211_hdr *hdr = frame;
1817 u16 fctl;
1818
1819 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1820 cts->frame_control = cpu_to_le16(fctl);
7e9ed188 1821 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1822 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1823}
1824EXPORT_SYMBOL(ieee80211_ctstoself_get);
1825
1826struct sk_buff *
1827ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1828 struct ieee80211_tx_control *control)
1829{
1830 struct ieee80211_local *local = hw_to_local(hw);
1831 struct sk_buff *skb;
1832 struct sta_info *sta;
1833 ieee80211_tx_handler *handler;
1834 struct ieee80211_txrx_data tx;
1835 ieee80211_txrx_result res = TXRX_DROP;
1836 struct net_device *bdev;
1837 struct ieee80211_sub_if_data *sdata;
1838 struct ieee80211_if_ap *bss = NULL;
1839
881d966b 1840 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1841 if (bdev) {
1842 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1843 bss = &sdata->u.ap;
1844 dev_put(bdev);
1845 }
1846 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1847 return NULL;
1848
1849 if (bss->dtim_count != 0)
1850 return NULL; /* send buffered bc/mc only after DTIM beacon */
1851 memset(control, 0, sizeof(*control));
1852 while (1) {
1853 skb = skb_dequeue(&bss->ps_bc_buf);
1854 if (!skb)
1855 return NULL;
1856 local->total_ps_buffered--;
1857
1858 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1859 struct ieee80211_hdr *hdr =
1860 (struct ieee80211_hdr *) skb->data;
1861 /* more buffered multicast/broadcast frames ==> set
1862 * MoreData flag in IEEE 802.11 header to inform PS
1863 * STAs */
1864 hdr->frame_control |=
1865 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1866 }
1867
1868 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1869 break;
1870 dev_kfree_skb_any(skb);
1871 }
1872 sta = tx.sta;
badffb72 1873 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
e2ebc74d
JB		 1874
1875 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1876 res = (*handler)(&tx);
1877 if (res == TXRX_DROP || res == TXRX_QUEUED)
1878 break;
1879 }
1880 dev_put(tx.dev);
1881 skb = tx.skb; /* handlers are allowed to change skb */
1882
1883 if (res == TXRX_DROP) {
1884 I802_DEBUG_INC(local->tx_handlers_drop);
1885 dev_kfree_skb(skb);
1886 skb = NULL;
1887 } else if (res == TXRX_QUEUED) {
1888 I802_DEBUG_INC(local->tx_handlers_queued);
1889 skb = NULL;
1890 }
1891
1892 if (sta)
1893 sta_info_put(sta);
1894
1895 return skb;
1896}
1897EXPORT_SYMBOL(ieee80211_get_buffered_bc);
kernel source for telekom puls (alcatel/mediatek)