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mac80211: move TX info into skb->cb
[deliverable/linux.git] / net / mac80211 / tx.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "led.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "wpa.h"
32 #include "wme.h"
33 #include "rate.h"
34
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
38
39 /* misc utils */
40
41 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
42 struct ieee80211_hdr *hdr)
43 {
44 /* Set the sequence number for this frame. */
45 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
46
47 /* Increase the sequence number. */
48 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
49 }
50
51 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
52 static void ieee80211_dump_frame(const char *ifname, const char *title,
53 const struct sk_buff *skb)
54 {
55 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
56 u16 fc;
57 int hdrlen;
58 DECLARE_MAC_BUF(mac);
59
60 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
61 if (skb->len < 4) {
62 printk("\n");
63 return;
64 }
65
66 fc = le16_to_cpu(hdr->frame_control);
67 hdrlen = ieee80211_get_hdrlen(fc);
68 if (hdrlen > skb->len)
69 hdrlen = skb->len;
70 if (hdrlen >= 4)
71 printk(" FC=0x%04x DUR=0x%04x",
72 fc, le16_to_cpu(hdr->duration_id));
73 if (hdrlen >= 10)
74 printk(" A1=%s", print_mac(mac, hdr->addr1));
75 if (hdrlen >= 16)
76 printk(" A2=%s", print_mac(mac, hdr->addr2));
77 if (hdrlen >= 24)
78 printk(" A3=%s", print_mac(mac, hdr->addr3));
79 if (hdrlen >= 30)
80 printk(" A4=%s", print_mac(mac, hdr->addr4));
81 printk("\n");
82 }
83 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
84 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
85 struct sk_buff *skb)
86 {
87 }
88 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
89
90 static u16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
91 int next_frag_len)
92 {
93 int rate, mrate, erp, dur, i;
94 struct ieee80211_rate *txrate;
95 struct ieee80211_local *local = tx->local;
96 struct ieee80211_supported_band *sband;
97
98 sband = local->hw.wiphy->bands[tx->channel->band];
99 txrate = &sband->bitrates[tx->rate_idx];
100
101 erp = 0;
102 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
103 erp = txrate->flags & IEEE80211_RATE_ERP_G;
104
105 /*
106 * data and mgmt (except PS Poll):
107 * - during CFP: 32768
108 * - during contention period:
109 * if addr1 is group address: 0
110 * if more fragments = 0 and addr1 is individual address: time to
111 * transmit one ACK plus SIFS
112 * if more fragments = 1 and addr1 is individual address: time to
113 * transmit next fragment plus 2 x ACK plus 3 x SIFS
114 *
115 * IEEE 802.11, 9.6:
116 * - control response frame (CTS or ACK) shall be transmitted using the
117 * same rate as the immediately previous frame in the frame exchange
118 * sequence, if this rate belongs to the PHY mandatory rates, or else
119 * at the highest possible rate belonging to the PHY rates in the
120 * BSSBasicRateSet
121 */
122
123 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
124 /* TODO: These control frames are not currently sent by
125 * 80211.o, but should they be implemented, this function
126 * needs to be updated to support duration field calculation.
127 *
128 * RTS: time needed to transmit pending data/mgmt frame plus
129 * one CTS frame plus one ACK frame plus 3 x SIFS
130 * CTS: duration of immediately previous RTS minus time
131 * required to transmit CTS and its SIFS
132 * ACK: 0 if immediately previous directed data/mgmt had
133 * more=0, with more=1 duration in ACK frame is duration
134 * from previous frame minus time needed to transmit ACK
135 * and its SIFS
136 * PS Poll: BIT(15) | BIT(14) | aid
137 */
138 return 0;
139 }
140
141 /* data/mgmt */
142 if (0 /* FIX: data/mgmt during CFP */)
143 return 32768;
144
145 if (group_addr) /* Group address as the destination - no ACK */
146 return 0;
147
148 /* Individual destination address:
149 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
150 * CTS and ACK frames shall be transmitted using the highest rate in
151 * basic rate set that is less than or equal to the rate of the
152 * immediately previous frame and that is using the same modulation
153 * (CCK or OFDM). If no basic rate set matches with these requirements,
154 * the highest mandatory rate of the PHY that is less than or equal to
155 * the rate of the previous frame is used.
156 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
157 */
158 rate = -1;
159 /* use lowest available if everything fails */
160 mrate = sband->bitrates[0].bitrate;
161 for (i = 0; i < sband->n_bitrates; i++) {
162 struct ieee80211_rate *r = &sband->bitrates[i];
163
164 if (r->bitrate > txrate->bitrate)
165 break;
166
167 if (tx->sdata->basic_rates & BIT(i))
168 rate = r->bitrate;
169
170 switch (sband->band) {
171 case IEEE80211_BAND_2GHZ: {
172 u32 flag;
173 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
174 flag = IEEE80211_RATE_MANDATORY_G;
175 else
176 flag = IEEE80211_RATE_MANDATORY_B;
177 if (r->flags & flag)
178 mrate = r->bitrate;
179 break;
180 }
181 case IEEE80211_BAND_5GHZ:
182 if (r->flags & IEEE80211_RATE_MANDATORY_A)
183 mrate = r->bitrate;
184 break;
185 case IEEE80211_NUM_BANDS:
186 WARN_ON(1);
187 break;
188 }
189 }
190 if (rate == -1) {
191 /* No matching basic rate found; use highest suitable mandatory
192 * PHY rate */
193 rate = mrate;
194 }
195
196 /* Time needed to transmit ACK
197 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
198 * to closest integer */
199
200 dur = ieee80211_frame_duration(local, 10, rate, erp,
201 tx->sdata->bss_conf.use_short_preamble);
202
203 if (next_frag_len) {
204 /* Frame is fragmented: duration increases with time needed to
205 * transmit next fragment plus ACK and 2 x SIFS. */
206 dur *= 2; /* ACK + SIFS */
207 /* next fragment */
208 dur += ieee80211_frame_duration(local, next_frag_len,
209 txrate->bitrate, erp,
210 tx->sdata->bss_conf.use_short_preamble);
211 }
212
213 return dur;
214 }
215
216 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
217 int queue)
218 {
219 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
220 }
221
222 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
223 int queue)
224 {
225 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
226 }
227
228 static int inline is_ieee80211_device(struct net_device *dev,
229 struct net_device *master)
230 {
231 return (wdev_priv(dev->ieee80211_ptr) ==
232 wdev_priv(master->ieee80211_ptr));
233 }
234
235 /* tx handlers */
236
237 static ieee80211_tx_result
238 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
239 {
240 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
241 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
242 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
243 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
244 u32 sta_flags;
245
246 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
247 return TX_CONTINUE;
248
249 if (unlikely(tx->local->sta_sw_scanning) &&
250 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
251 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
252 return TX_DROP;
253
254 if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT)
255 return TX_CONTINUE;
256
257 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
258 return TX_CONTINUE;
259
260 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
261
262 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
263 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
264 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
265 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
266 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
267 DECLARE_MAC_BUF(mac);
268 printk(KERN_DEBUG "%s: dropped data frame to not "
269 "associated station %s\n",
270 tx->dev->name, print_mac(mac, hdr->addr1));
271 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
272 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
273 return TX_DROP;
274 }
275 } else {
276 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
277 tx->local->num_sta == 0 &&
278 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
279 /*
280 * No associated STAs - no need to send multicast
281 * frames.
282 */
283 return TX_DROP;
284 }
285 return TX_CONTINUE;
286 }
287
288 return TX_CONTINUE;
289 }
290
291 static ieee80211_tx_result
292 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
293 {
294 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
295
296 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
297 ieee80211_include_sequence(tx->sdata, hdr);
298
299 return TX_CONTINUE;
300 }
301
302 /* This function is called whenever the AP is about to exceed the maximum limit
303 * of buffered frames for power saving STAs. This situation should not really
304 * happen often during normal operation, so dropping the oldest buffered packet
305 * from each queue should be OK to make some room for new frames. */
306 static void purge_old_ps_buffers(struct ieee80211_local *local)
307 {
308 int total = 0, purged = 0;
309 struct sk_buff *skb;
310 struct ieee80211_sub_if_data *sdata;
311 struct sta_info *sta;
312
313 /*
314 * virtual interfaces are protected by RCU
315 */
316 rcu_read_lock();
317
318 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
319 struct ieee80211_if_ap *ap;
320 if (sdata->dev == local->mdev ||
321 sdata->vif.type != IEEE80211_IF_TYPE_AP)
322 continue;
323 ap = &sdata->u.ap;
324 skb = skb_dequeue(&ap->ps_bc_buf);
325 if (skb) {
326 purged++;
327 dev_kfree_skb(skb);
328 }
329 total += skb_queue_len(&ap->ps_bc_buf);
330 }
331
332 list_for_each_entry_rcu(sta, &local->sta_list, list) {
333 skb = skb_dequeue(&sta->ps_tx_buf);
334 if (skb) {
335 purged++;
336 dev_kfree_skb(skb);
337 }
338 total += skb_queue_len(&sta->ps_tx_buf);
339 }
340
341 rcu_read_unlock();
342
343 local->total_ps_buffered = total;
344 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
345 wiphy_name(local->hw.wiphy), purged);
346 }
347
348 static ieee80211_tx_result
349 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
350 {
351 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
352
353 /*
354 * broadcast/multicast frame
355 *
356 * If any of the associated stations is in power save mode,
357 * the frame is buffered to be sent after DTIM beacon frame.
358 * This is done either by the hardware or us.
359 */
360
361 /* not AP/IBSS or ordered frame */
362 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
363 return TX_CONTINUE;
364
365 /* no stations in PS mode */
366 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
367 return TX_CONTINUE;
368
369 /* buffered in mac80211 */
370 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
371 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
372 purge_old_ps_buffers(tx->local);
373 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
374 AP_MAX_BC_BUFFER) {
375 if (net_ratelimit()) {
376 printk(KERN_DEBUG "%s: BC TX buffer full - "
377 "dropping the oldest frame\n",
378 tx->dev->name);
379 }
380 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
381 } else
382 tx->local->total_ps_buffered++;
383 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
384 return TX_QUEUED;
385 }
386
387 /* buffered in hardware */
388 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
389
390 return TX_CONTINUE;
391 }
392
393 static ieee80211_tx_result
394 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
395 {
396 struct sta_info *sta = tx->sta;
397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
398 u32 staflags;
399 DECLARE_MAC_BUF(mac);
400
401 if (unlikely(!sta ||
402 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
403 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
404 return TX_CONTINUE;
405
406 staflags = get_sta_flags(sta);
407
408 if (unlikely((staflags & WLAN_STA_PS) &&
409 !(staflags & WLAN_STA_PSPOLL))) {
410 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
411 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
412 "before %d)\n",
413 print_mac(mac, sta->addr), sta->aid,
414 skb_queue_len(&sta->ps_tx_buf));
415 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
416 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
417 purge_old_ps_buffers(tx->local);
418 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
419 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
420 if (net_ratelimit()) {
421 printk(KERN_DEBUG "%s: STA %s TX "
422 "buffer full - dropping oldest frame\n",
423 tx->dev->name, print_mac(mac, sta->addr));
424 }
425 dev_kfree_skb(old);
426 } else
427 tx->local->total_ps_buffered++;
428
429 /* Queue frame to be sent after STA sends an PS Poll frame */
430 if (skb_queue_empty(&sta->ps_tx_buf))
431 sta_info_set_tim_bit(sta);
432
433 info->control.jiffies = jiffies;
434 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
435 return TX_QUEUED;
436 }
437 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
438 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
439 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
440 "set -> send frame\n", tx->dev->name,
441 print_mac(mac, sta->addr));
442 }
443 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
444 clear_sta_flags(sta, WLAN_STA_PSPOLL);
445
446 return TX_CONTINUE;
447 }
448
449 static ieee80211_tx_result
450 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
451 {
452 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
453 return TX_CONTINUE;
454
455 if (tx->flags & IEEE80211_TX_UNICAST)
456 return ieee80211_tx_h_unicast_ps_buf(tx);
457 else
458 return ieee80211_tx_h_multicast_ps_buf(tx);
459 }
460
461 static ieee80211_tx_result
462 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
463 {
464 struct ieee80211_key *key;
465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
466 u16 fc = tx->fc;
467
468 if (unlikely(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT))
469 tx->key = NULL;
470 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
471 tx->key = key;
472 else if ((key = rcu_dereference(tx->sdata->default_key)))
473 tx->key = key;
474 else if (tx->sdata->drop_unencrypted &&
475 !(info->flags & IEEE80211_TX_CTL_EAPOL_FRAME) &&
476 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
477 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
478 return TX_DROP;
479 } else
480 tx->key = NULL;
481
482 if (tx->key) {
483 u16 ftype, stype;
484
485 tx->key->tx_rx_count++;
486 /* TODO: add threshold stuff again */
487
488 switch (tx->key->conf.alg) {
489 case ALG_WEP:
490 ftype = fc & IEEE80211_FCTL_FTYPE;
491 stype = fc & IEEE80211_FCTL_STYPE;
492
493 if (ftype == IEEE80211_FTYPE_MGMT &&
494 stype == IEEE80211_STYPE_AUTH)
495 break;
496 case ALG_TKIP:
497 case ALG_CCMP:
498 if (!WLAN_FC_DATA_PRESENT(fc))
499 tx->key = NULL;
500 break;
501 }
502 }
503
504 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
505 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
506
507 return TX_CONTINUE;
508 }
509
510 static ieee80211_tx_result
511 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
512 {
513 struct rate_selection rsel;
514 struct ieee80211_supported_band *sband;
515 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
516
517 sband = tx->local->hw.wiphy->bands[tx->channel->band];
518
519 if (likely(tx->rate_idx < 0)) {
520 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
521 tx->rate_idx = rsel.rate_idx;
522 if (unlikely(rsel.probe_idx >= 0)) {
523 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
524 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
525 info->control.alt_retry_rate_idx = tx->rate_idx;
526 tx->rate_idx = rsel.probe_idx;
527 } else
528 info->control.alt_retry_rate_idx = -1;
529
530 if (unlikely(tx->rate_idx < 0))
531 return TX_DROP;
532 } else
533 info->control.alt_retry_rate_idx = -1;
534
535 if (tx->sdata->bss_conf.use_cts_prot &&
536 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
537 tx->last_frag_rate_idx = tx->rate_idx;
538 if (rsel.probe_idx >= 0)
539 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
540 else
541 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
542 tx->rate_idx = rsel.nonerp_idx;
543 info->tx_rate_idx = rsel.nonerp_idx;
544 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
545 } else {
546 tx->last_frag_rate_idx = tx->rate_idx;
547 info->tx_rate_idx = tx->rate_idx;
548 }
549 info->tx_rate_idx = tx->rate_idx;
550
551 return TX_CONTINUE;
552 }
553
554 static ieee80211_tx_result
555 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
556 {
557 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
558 u16 fc = le16_to_cpu(hdr->frame_control);
559 u16 dur;
560 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
561 struct ieee80211_supported_band *sband;
562
563 sband = tx->local->hw.wiphy->bands[tx->channel->band];
564
565 if (tx->sta)
566 info->control.aid = tx->sta->aid;
567
568 if (!info->control.retry_limit) {
569 if (!is_multicast_ether_addr(hdr->addr1)) {
570 int len = min_t(int, tx->skb->len + FCS_LEN,
571 tx->local->fragmentation_threshold);
572 if (len > tx->local->rts_threshold
573 && tx->local->rts_threshold <
574 IEEE80211_MAX_RTS_THRESHOLD) {
575 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
576 info->flags |=
577 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
578 info->control.retry_limit =
579 tx->local->long_retry_limit;
580 } else {
581 info->control.retry_limit =
582 tx->local->short_retry_limit;
583 }
584 } else {
585 info->control.retry_limit = 1;
586 }
587 }
588
589 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
590 /* Do not use multiple retry rates when sending fragmented
591 * frames.
592 * TODO: The last fragment could still use multiple retry
593 * rates. */
594 info->control.alt_retry_rate_idx = -1;
595 }
596
597 /* Use CTS protection for unicast frames sent using extended rates if
598 * there are associated non-ERP stations and RTS/CTS is not configured
599 * for the frame. */
600 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
601 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
602 (tx->flags & IEEE80211_TX_UNICAST) &&
603 tx->sdata->bss_conf.use_cts_prot &&
604 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
605 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
606
607 /* Transmit data frames using short preambles if the driver supports
608 * short preambles at the selected rate and short preambles are
609 * available on the network at the current point in time. */
610 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
611 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
612 tx->sdata->bss_conf.use_short_preamble &&
613 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
614 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
615 }
616
617 /* Setup duration field for the first fragment of the frame. Duration
618 * for remaining fragments will be updated when they are being sent
619 * to low-level driver in ieee80211_tx(). */
620 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
621 (tx->flags & IEEE80211_TX_FRAGMENTED) ?
622 tx->extra_frag[0]->len : 0);
623 hdr->duration_id = cpu_to_le16(dur);
624
625 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
626 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
627 struct ieee80211_supported_band *sband;
628 struct ieee80211_rate *rate;
629 s8 baserate = -1;
630 int idx;
631
632 sband = tx->local->hw.wiphy->bands[tx->channel->band];
633
634 /* Do not use multiple retry rates when using RTS/CTS */
635 info->control.alt_retry_rate_idx = -1;
636
637 /* Use min(data rate, max base rate) as CTS/RTS rate */
638 rate = &sband->bitrates[tx->rate_idx];
639
640 for (idx = 0; idx < sband->n_bitrates; idx++) {
641 if (sband->bitrates[idx].bitrate > rate->bitrate)
642 continue;
643 if (tx->sdata->basic_rates & BIT(idx) &&
644 (baserate < 0 ||
645 (sband->bitrates[baserate].bitrate
646 < sband->bitrates[idx].bitrate)))
647 baserate = idx;
648 }
649
650 if (baserate >= 0)
651 info->control.rts_cts_rate_idx = baserate;
652 else
653 info->control.rts_cts_rate_idx = 0;
654 }
655
656 if (tx->sta)
657 info->control.aid = tx->sta->aid;
658
659 return TX_CONTINUE;
660 }
661
662 static ieee80211_tx_result
663 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
664 {
665 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
666 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
667 struct sk_buff **frags, *first, *frag;
668 int i;
669 u16 seq;
670 u8 *pos;
671 int frag_threshold = tx->local->fragmentation_threshold;
672
673 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
674 return TX_CONTINUE;
675
676 first = tx->skb;
677
678 hdrlen = ieee80211_get_hdrlen(tx->fc);
679 payload_len = first->len - hdrlen;
680 per_fragm = frag_threshold - hdrlen - FCS_LEN;
681 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
682
683 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
684 if (!frags)
685 goto fail;
686
687 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
688 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
689 pos = first->data + hdrlen + per_fragm;
690 left = payload_len - per_fragm;
691 for (i = 0; i < num_fragm - 1; i++) {
692 struct ieee80211_hdr *fhdr;
693 size_t copylen;
694
695 if (left <= 0)
696 goto fail;
697
698 /* reserve enough extra head and tail room for possible
699 * encryption */
700 frag = frags[i] =
701 dev_alloc_skb(tx->local->tx_headroom +
702 frag_threshold +
703 IEEE80211_ENCRYPT_HEADROOM +
704 IEEE80211_ENCRYPT_TAILROOM);
705 if (!frag)
706 goto fail;
707 /* Make sure that all fragments use the same priority so
708 * that they end up using the same TX queue */
709 frag->priority = first->priority;
710 skb_reserve(frag, tx->local->tx_headroom +
711 IEEE80211_ENCRYPT_HEADROOM);
712 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
713 memcpy(fhdr, first->data, hdrlen);
714 if (i == num_fragm - 2)
715 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
716 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
717 copylen = left > per_fragm ? per_fragm : left;
718 memcpy(skb_put(frag, copylen), pos, copylen);
719
720 pos += copylen;
721 left -= copylen;
722 }
723 skb_trim(first, hdrlen + per_fragm);
724
725 tx->num_extra_frag = num_fragm - 1;
726 tx->extra_frag = frags;
727
728 return TX_CONTINUE;
729
730 fail:
731 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
732 if (frags) {
733 for (i = 0; i < num_fragm - 1; i++)
734 if (frags[i])
735 dev_kfree_skb(frags[i]);
736 kfree(frags);
737 }
738 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
739 return TX_DROP;
740 }
741
742 static ieee80211_tx_result
743 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
744 {
745 if (!tx->key)
746 return TX_CONTINUE;
747
748 switch (tx->key->conf.alg) {
749 case ALG_WEP:
750 return ieee80211_crypto_wep_encrypt(tx);
751 case ALG_TKIP:
752 return ieee80211_crypto_tkip_encrypt(tx);
753 case ALG_CCMP:
754 return ieee80211_crypto_ccmp_encrypt(tx);
755 }
756
757 /* not reached */
758 WARN_ON(1);
759 return TX_DROP;
760 }
761
762 static ieee80211_tx_result
763 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
764 {
765 struct ieee80211_local *local = tx->local;
766 struct sk_buff *skb = tx->skb;
767 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
768 u32 load = 0, hdrtime;
769 struct ieee80211_rate *rate;
770 struct ieee80211_supported_band *sband;
771 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
772
773 sband = tx->local->hw.wiphy->bands[tx->channel->band];
774 rate = &sband->bitrates[tx->rate_idx];
775
776 /* TODO: this could be part of tx_status handling, so that the number
777 * of retries would be known; TX rate should in that case be stored
778 * somewhere with the packet */
779
780 /* Estimate total channel use caused by this frame */
781
782 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
783 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
784
785 if (tx->channel->band == IEEE80211_BAND_5GHZ ||
786 (tx->channel->band == IEEE80211_BAND_2GHZ &&
787 rate->flags & IEEE80211_RATE_ERP_G))
788 hdrtime = CHAN_UTIL_HDR_SHORT;
789 else
790 hdrtime = CHAN_UTIL_HDR_LONG;
791
792 load = hdrtime;
793 if (!is_multicast_ether_addr(hdr->addr1))
794 load += hdrtime;
795
796 if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
797 load += 2 * hdrtime;
798 else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
799 load += hdrtime;
800
801 /* TODO: optimise again */
802 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
803
804 if (tx->extra_frag) {
805 int i;
806 for (i = 0; i < tx->num_extra_frag; i++) {
807 load += 2 * hdrtime;
808 load += tx->extra_frag[i]->len *
809 rate->bitrate;
810 }
811 }
812
813 /* Divide channel_use by 8 to avoid wrapping around the counter */
814 load >>= CHAN_UTIL_SHIFT;
815 local->channel_use_raw += load;
816 if (tx->sta)
817 tx->sta->channel_use_raw += load;
818 tx->sdata->channel_use_raw += load;
819
820 if (tx->sta) {
821 tx->sta->tx_packets++;
822 tx->sta->tx_fragments++;
823 tx->sta->tx_bytes += tx->skb->len;
824 if (tx->extra_frag) {
825 int i;
826 tx->sta->tx_fragments += tx->num_extra_frag;
827 for (i = 0; i < tx->num_extra_frag; i++) {
828 tx->sta->tx_bytes +=
829 tx->extra_frag[i]->len;
830 }
831 }
832 }
833
834 return TX_CONTINUE;
835 }
836
837
838 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *);
839 static ieee80211_tx_handler ieee80211_tx_handlers[] =
840 {
841 ieee80211_tx_h_check_assoc,
842 ieee80211_tx_h_sequence,
843 ieee80211_tx_h_ps_buf,
844 ieee80211_tx_h_select_key,
845 ieee80211_tx_h_michael_mic_add,
846 ieee80211_tx_h_rate_ctrl,
847 ieee80211_tx_h_misc,
848 ieee80211_tx_h_fragment,
849 /* handlers after fragment must be aware of tx info fragmentation! */
850 ieee80211_tx_h_encrypt,
851 ieee80211_tx_h_stats,
852 NULL
853 };
854
855 /* actual transmit path */
856
857 /*
858 * deal with packet injection down monitor interface
859 * with Radiotap Header -- only called for monitor mode interface
860 */
861 static ieee80211_tx_result
862 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
863 struct sk_buff *skb)
864 {
865 /*
866 * this is the moment to interpret and discard the radiotap header that
867 * must be at the start of the packet injected in Monitor mode
868 *
869 * Need to take some care with endian-ness since radiotap
870 * args are little-endian
871 */
872
873 struct ieee80211_radiotap_iterator iterator;
874 struct ieee80211_radiotap_header *rthdr =
875 (struct ieee80211_radiotap_header *) skb->data;
876 struct ieee80211_supported_band *sband;
877 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
878 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
879
880 sband = tx->local->hw.wiphy->bands[tx->channel->band];
881
882 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
883 info->flags |= IEEE80211_TX_CTL_INJECTED;
884 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
885
886 /*
887 * for every radiotap entry that is present
888 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
889 * entries present, or -EINVAL on error)
890 */
891
892 while (!ret) {
893 int i, target_rate;
894
895 ret = ieee80211_radiotap_iterator_next(&iterator);
896
897 if (ret)
898 continue;
899
900 /* see if this argument is something we can use */
901 switch (iterator.this_arg_index) {
902 /*
903 * You must take care when dereferencing iterator.this_arg
904 * for multibyte types... the pointer is not aligned. Use
905 * get_unaligned((type *)iterator.this_arg) to dereference
906 * iterator.this_arg for type "type" safely on all arches.
907 */
908 case IEEE80211_RADIOTAP_RATE:
909 /*
910 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
911 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
912 */
913 target_rate = (*iterator.this_arg) * 5;
914 for (i = 0; i < sband->n_bitrates; i++) {
915 struct ieee80211_rate *r;
916
917 r = &sband->bitrates[i];
918
919 if (r->bitrate == target_rate) {
920 tx->rate_idx = i;
921 break;
922 }
923 }
924 break;
925
926 case IEEE80211_RADIOTAP_ANTENNA:
927 /*
928 * radiotap uses 0 for 1st ant, mac80211 is 1 for
929 * 1st ant
930 */
931 info->antenna_sel_tx = (*iterator.this_arg) + 1;
932 break;
933
934 #if 0
935 case IEEE80211_RADIOTAP_DBM_TX_POWER:
936 control->power_level = *iterator.this_arg;
937 break;
938 #endif
939
940 case IEEE80211_RADIOTAP_FLAGS:
941 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
942 /*
943 * this indicates that the skb we have been
944 * handed has the 32-bit FCS CRC at the end...
945 * we should react to that by snipping it off
946 * because it will be recomputed and added
947 * on transmission
948 */
949 if (skb->len < (iterator.max_length + FCS_LEN))
950 return TX_DROP;
951
952 skb_trim(skb, skb->len - FCS_LEN);
953 }
954 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
955 info->flags &=
956 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
957 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
958 tx->flags |= IEEE80211_TX_FRAGMENTED;
959 break;
960
961 /*
962 * Please update the file
963 * Documentation/networking/mac80211-injection.txt
964 * when parsing new fields here.
965 */
966
967 default:
968 break;
969 }
970 }
971
972 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
973 return TX_DROP;
974
975 /*
976 * remove the radiotap header
977 * iterator->max_length was sanity-checked against
978 * skb->len by iterator init
979 */
980 skb_pull(skb, iterator.max_length);
981
982 return TX_CONTINUE;
983 }
984
985 /*
986 * initialises @tx
987 */
988 static ieee80211_tx_result
989 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
990 struct sk_buff *skb,
991 struct net_device *dev)
992 {
993 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
994 struct ieee80211_hdr *hdr;
995 struct ieee80211_sub_if_data *sdata;
996 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
997
998 int hdrlen;
999
1000 memset(tx, 0, sizeof(*tx));
1001 tx->skb = skb;
1002 tx->dev = dev; /* use original interface */
1003 tx->local = local;
1004 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1005 tx->channel = local->hw.conf.channel;
1006 /*
1007 * Set this flag (used below to indicate "automatic fragmentation"),
1008 * it will be cleared/left by radiotap as desired.
1009 */
1010 tx->flags |= IEEE80211_TX_FRAGMENTED;
1011
1012 /* process and remove the injection radiotap header */
1013 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1014 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
1015 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
1016 return TX_DROP;
1017
1018 /*
1019 * __ieee80211_parse_tx_radiotap has now removed
1020 * the radiotap header that was present and pre-filled
1021 * 'tx' with tx control information.
1022 */
1023 }
1024
1025 hdr = (struct ieee80211_hdr *) skb->data;
1026
1027 tx->sta = sta_info_get(local, hdr->addr1);
1028 tx->fc = le16_to_cpu(hdr->frame_control);
1029
1030 if (is_multicast_ether_addr(hdr->addr1)) {
1031 tx->flags &= ~IEEE80211_TX_UNICAST;
1032 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1033 } else {
1034 tx->flags |= IEEE80211_TX_UNICAST;
1035 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1036 }
1037
1038 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1039 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1040 skb->len + FCS_LEN > local->fragmentation_threshold &&
1041 !local->ops->set_frag_threshold)
1042 tx->flags |= IEEE80211_TX_FRAGMENTED;
1043 else
1044 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1045 }
1046
1047 if (!tx->sta)
1048 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1049 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1050 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1051
1052 hdrlen = ieee80211_get_hdrlen(tx->fc);
1053 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1054 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1055 tx->ethertype = (pos[0] << 8) | pos[1];
1056 }
1057 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1058
1059 return TX_CONTINUE;
1060 }
1061
1062 /*
1063 * NB: @tx is uninitialised when passed in here
1064 */
1065 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1066 struct sk_buff *skb,
1067 struct net_device *mdev)
1068 {
1069 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1070 struct net_device *dev;
1071
1072 dev = dev_get_by_index(&init_net, info->control.ifindex);
1073 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1074 dev_put(dev);
1075 dev = NULL;
1076 }
1077 if (unlikely(!dev))
1078 return -ENODEV;
1079 /* initialises tx with control */
1080 __ieee80211_tx_prepare(tx, skb, dev);
1081 dev_put(dev);
1082 return 0;
1083 }
1084
1085 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1086 struct ieee80211_tx_data *tx)
1087 {
1088 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1089 int ret, i;
1090
1091 if (!ieee80211_qdisc_installed(local->mdev) &&
1092 __ieee80211_queue_stopped(local, 0)) {
1093 netif_stop_queue(local->mdev);
1094 return IEEE80211_TX_AGAIN;
1095 }
1096 if (skb) {
1097 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1098 "TX to low-level driver", skb);
1099 ret = local->ops->tx(local_to_hw(local), skb);
1100 if (ret)
1101 return IEEE80211_TX_AGAIN;
1102 local->mdev->trans_start = jiffies;
1103 ieee80211_led_tx(local, 1);
1104 }
1105 if (tx->extra_frag) {
1106 for (i = 0; i < tx->num_extra_frag; i++) {
1107 if (!tx->extra_frag[i])
1108 continue;
1109 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1110 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1111 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1112 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1113 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1114 if (__ieee80211_queue_stopped(local, info->queue))
1115 return IEEE80211_TX_FRAG_AGAIN;
1116 if (i == tx->num_extra_frag) {
1117 info->tx_rate_idx = tx->last_frag_rate_idx;
1118
1119 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1120 info->flags |=
1121 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1122 else
1123 info->flags &=
1124 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1125 }
1126
1127 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1128 "TX to low-level driver",
1129 tx->extra_frag[i]);
1130 ret = local->ops->tx(local_to_hw(local),
1131 tx->extra_frag[i]);
1132 if (ret)
1133 return IEEE80211_TX_FRAG_AGAIN;
1134 local->mdev->trans_start = jiffies;
1135 ieee80211_led_tx(local, 1);
1136 tx->extra_frag[i] = NULL;
1137 }
1138 kfree(tx->extra_frag);
1139 tx->extra_frag = NULL;
1140 }
1141 return IEEE80211_TX_OK;
1142 }
1143
1144 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1145 {
1146 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1147 struct sta_info *sta;
1148 ieee80211_tx_handler *handler;
1149 struct ieee80211_tx_data tx;
1150 ieee80211_tx_result res = TX_DROP, res_prepare;
1151 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1152 int ret, i;
1153 int queue = info->queue;
1154
1155 WARN_ON(__ieee80211_queue_pending(local, queue));
1156
1157 if (unlikely(skb->len < 10)) {
1158 dev_kfree_skb(skb);
1159 return 0;
1160 }
1161
1162 rcu_read_lock();
1163
1164 /* initialises tx */
1165 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1166
1167 if (res_prepare == TX_DROP) {
1168 dev_kfree_skb(skb);
1169 rcu_read_unlock();
1170 return 0;
1171 }
1172
1173 sta = tx.sta;
1174 tx.channel = local->hw.conf.channel;
1175 info->band = tx.channel->band;
1176
1177 for (handler = ieee80211_tx_handlers; *handler != NULL;
1178 handler++) {
1179 res = (*handler)(&tx);
1180 if (res != TX_CONTINUE)
1181 break;
1182 }
1183
1184 if (WARN_ON(tx.skb != skb))
1185 goto drop;
1186
1187 if (unlikely(res == TX_DROP)) {
1188 I802_DEBUG_INC(local->tx_handlers_drop);
1189 goto drop;
1190 }
1191
1192 if (unlikely(res == TX_QUEUED)) {
1193 I802_DEBUG_INC(local->tx_handlers_queued);
1194 rcu_read_unlock();
1195 return 0;
1196 }
1197
1198 if (tx.extra_frag) {
1199 for (i = 0; i < tx.num_extra_frag; i++) {
1200 int next_len, dur;
1201 struct ieee80211_hdr *hdr =
1202 (struct ieee80211_hdr *)
1203 tx.extra_frag[i]->data;
1204
1205 if (i + 1 < tx.num_extra_frag) {
1206 next_len = tx.extra_frag[i + 1]->len;
1207 } else {
1208 next_len = 0;
1209 tx.rate_idx = tx.last_frag_rate_idx;
1210 }
1211 dur = ieee80211_duration(&tx, 0, next_len);
1212 hdr->duration_id = cpu_to_le16(dur);
1213 }
1214 }
1215
1216 retry:
1217 ret = __ieee80211_tx(local, skb, &tx);
1218 if (ret) {
1219 struct ieee80211_tx_stored_packet *store =
1220 &local->pending_packet[info->queue];
1221
1222 if (ret == IEEE80211_TX_FRAG_AGAIN)
1223 skb = NULL;
1224 set_bit(IEEE80211_LINK_STATE_PENDING,
1225 &local->state[queue]);
1226 smp_mb();
1227 /* When the driver gets out of buffers during sending of
1228 * fragments and calls ieee80211_stop_queue, there is
1229 * a small window between IEEE80211_LINK_STATE_XOFF and
1230 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1231 * gets available in that window (i.e. driver calls
1232 * ieee80211_wake_queue), we would end up with ieee80211_tx
1233 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1234 * continuing transmitting here when that situation is
1235 * possible to have happened. */
1236 if (!__ieee80211_queue_stopped(local, queue)) {
1237 clear_bit(IEEE80211_LINK_STATE_PENDING,
1238 &local->state[queue]);
1239 goto retry;
1240 }
1241 store->skb = skb;
1242 store->extra_frag = tx.extra_frag;
1243 store->num_extra_frag = tx.num_extra_frag;
1244 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1245 store->last_frag_rate_ctrl_probe =
1246 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1247 }
1248 rcu_read_unlock();
1249 return 0;
1250
1251 drop:
1252 if (skb)
1253 dev_kfree_skb(skb);
1254 for (i = 0; i < tx.num_extra_frag; i++)
1255 if (tx.extra_frag[i])
1256 dev_kfree_skb(tx.extra_frag[i]);
1257 kfree(tx.extra_frag);
1258 rcu_read_unlock();
1259 return 0;
1260 }
1261
1262 /* device xmit handlers */
1263
1264 int ieee80211_master_start_xmit(struct sk_buff *skb,
1265 struct net_device *dev)
1266 {
1267 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1268 struct net_device *odev = NULL;
1269 struct ieee80211_sub_if_data *osdata;
1270 int headroom;
1271 int ret;
1272
1273 if (info->control.ifindex)
1274 odev = dev_get_by_index(&init_net, info->control.ifindex);
1275 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1276 dev_put(odev);
1277 odev = NULL;
1278 }
1279 if (unlikely(!odev)) {
1280 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1281 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1282 "originating device\n", dev->name);
1283 #endif
1284 dev_kfree_skb(skb);
1285 return 0;
1286 }
1287
1288 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1289
1290 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1291 if (skb_headroom(skb) < headroom) {
1292 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1293 dev_kfree_skb(skb);
1294 dev_put(odev);
1295 return 0;
1296 }
1297 }
1298
1299 info->control.vif = &osdata->vif;
1300 ret = ieee80211_tx(odev, skb);
1301 dev_put(odev);
1302
1303 return ret;
1304 }
1305
1306 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1307 struct net_device *dev)
1308 {
1309 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1310 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1311 struct ieee80211_radiotap_header *prthdr =
1312 (struct ieee80211_radiotap_header *)skb->data;
1313 u16 len_rthdr;
1314
1315 /* check for not even having the fixed radiotap header part */
1316 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1317 goto fail; /* too short to be possibly valid */
1318
1319 /* is it a header version we can trust to find length from? */
1320 if (unlikely(prthdr->it_version))
1321 goto fail; /* only version 0 is supported */
1322
1323 /* then there must be a radiotap header with a length we can use */
1324 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1325
1326 /* does the skb contain enough to deliver on the alleged length? */
1327 if (unlikely(skb->len < len_rthdr))
1328 goto fail; /* skb too short for claimed rt header extent */
1329
1330 skb->dev = local->mdev;
1331
1332 /* needed because we set skb device to master */
1333 info->control.ifindex = dev->ifindex;
1334
1335 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1336 /* Interfaces should always request a status report */
1337 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1338
1339 /*
1340 * fix up the pointers accounting for the radiotap
1341 * header still being in there. We are being given
1342 * a precooked IEEE80211 header so no need for
1343 * normal processing
1344 */
1345 skb_set_mac_header(skb, len_rthdr);
1346 /*
1347 * these are just fixed to the end of the rt area since we
1348 * don't have any better information and at this point, nobody cares
1349 */
1350 skb_set_network_header(skb, len_rthdr);
1351 skb_set_transport_header(skb, len_rthdr);
1352
1353 /* pass the radiotap header up to the next stage intact */
1354 dev_queue_xmit(skb);
1355 return NETDEV_TX_OK;
1356
1357 fail:
1358 dev_kfree_skb(skb);
1359 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1360 }
1361
1362 /**
1363 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1364 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1365 * @skb: packet to be sent
1366 * @dev: incoming interface
1367 *
1368 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1369 * not be freed, and caller is responsible for either retrying later or freeing
1370 * skb).
1371 *
1372 * This function takes in an Ethernet header and encapsulates it with suitable
1373 * IEEE 802.11 header based on which interface the packet is coming in. The
1374 * encapsulated packet will then be passed to master interface, wlan#.11, for
1375 * transmission (through low-level driver).
1376 */
1377 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1378 struct net_device *dev)
1379 {
1380 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1381 struct ieee80211_tx_info *info;
1382 struct ieee80211_sub_if_data *sdata;
1383 int ret = 1, head_need;
1384 u16 ethertype, hdrlen, meshhdrlen = 0, fc;
1385 struct ieee80211_hdr hdr;
1386 struct ieee80211s_hdr mesh_hdr;
1387 const u8 *encaps_data;
1388 int encaps_len, skip_header_bytes;
1389 int nh_pos, h_pos;
1390 struct sta_info *sta;
1391 u32 sta_flags = 0;
1392
1393 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1394 if (unlikely(skb->len < ETH_HLEN)) {
1395 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1396 dev->name, skb->len);
1397 ret = 0;
1398 goto fail;
1399 }
1400
1401 nh_pos = skb_network_header(skb) - skb->data;
1402 h_pos = skb_transport_header(skb) - skb->data;
1403
1404 /* convert Ethernet header to proper 802.11 header (based on
1405 * operation mode) */
1406 ethertype = (skb->data[12] << 8) | skb->data[13];
1407 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1408
1409 switch (sdata->vif.type) {
1410 case IEEE80211_IF_TYPE_AP:
1411 case IEEE80211_IF_TYPE_VLAN:
1412 fc |= IEEE80211_FCTL_FROMDS;
1413 /* DA BSSID SA */
1414 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1415 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1416 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1417 hdrlen = 24;
1418 break;
1419 case IEEE80211_IF_TYPE_WDS:
1420 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1421 /* RA TA DA SA */
1422 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1423 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1424 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1425 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1426 hdrlen = 30;
1427 break;
1428 #ifdef CONFIG_MAC80211_MESH
1429 case IEEE80211_IF_TYPE_MESH_POINT:
1430 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1431 /* RA TA DA SA */
1432 if (is_multicast_ether_addr(skb->data))
1433 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1434 else if (mesh_nexthop_lookup(hdr.addr1, skb, dev))
1435 return 0;
1436 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1437 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1438 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1439 if (skb->pkt_type == PACKET_OTHERHOST) {
1440 /* Forwarded frame, keep mesh ttl and seqnum */
1441 struct ieee80211s_hdr *prev_meshhdr;
1442 prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb);
1443 meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr);
1444 memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen);
1445 sdata->u.sta.mshstats.fwded_frames++;
1446 } else {
1447 if (!sdata->u.sta.mshcfg.dot11MeshTTL) {
1448 /* Do not send frames with mesh_ttl == 0 */
1449 sdata->u.sta.mshstats.dropped_frames_ttl++;
1450 ret = 0;
1451 goto fail;
1452 }
1453 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1454 sdata);
1455 }
1456 hdrlen = 30;
1457 break;
1458 #endif
1459 case IEEE80211_IF_TYPE_STA:
1460 fc |= IEEE80211_FCTL_TODS;
1461 /* BSSID SA DA */
1462 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1463 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1464 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1465 hdrlen = 24;
1466 break;
1467 case IEEE80211_IF_TYPE_IBSS:
1468 /* DA SA BSSID */
1469 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1470 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1471 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1472 hdrlen = 24;
1473 break;
1474 default:
1475 ret = 0;
1476 goto fail;
1477 }
1478
1479 /*
1480 * There's no need to try to look up the destination
1481 * if it is a multicast address (which can only happen
1482 * in AP mode)
1483 */
1484 if (!is_multicast_ether_addr(hdr.addr1)) {
1485 rcu_read_lock();
1486 sta = sta_info_get(local, hdr.addr1);
1487 if (sta)
1488 sta_flags = get_sta_flags(sta);
1489 rcu_read_unlock();
1490 }
1491
1492 /* receiver and we are QoS enabled, use a QoS type frame */
1493 if (sta_flags & WLAN_STA_WME && local->hw.queues >= 4) {
1494 fc |= IEEE80211_STYPE_QOS_DATA;
1495 hdrlen += 2;
1496 }
1497
1498 /*
1499 * Drop unicast frames to unauthorised stations unless they are
1500 * EAPOL frames from the local station.
1501 */
1502 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1503 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1504 !(ethertype == ETH_P_PAE &&
1505 compare_ether_addr(dev->dev_addr,
1506 skb->data + ETH_ALEN) == 0))) {
1507 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1508 DECLARE_MAC_BUF(mac);
1509
1510 if (net_ratelimit())
1511 printk(KERN_DEBUG "%s: dropped frame to %s"
1512 " (unauthorized port)\n", dev->name,
1513 print_mac(mac, hdr.addr1));
1514 #endif
1515
1516 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1517
1518 ret = 0;
1519 goto fail;
1520 }
1521
1522 hdr.frame_control = cpu_to_le16(fc);
1523 hdr.duration_id = 0;
1524 hdr.seq_ctrl = 0;
1525
1526 skip_header_bytes = ETH_HLEN;
1527 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1528 encaps_data = bridge_tunnel_header;
1529 encaps_len = sizeof(bridge_tunnel_header);
1530 skip_header_bytes -= 2;
1531 } else if (ethertype >= 0x600) {
1532 encaps_data = rfc1042_header;
1533 encaps_len = sizeof(rfc1042_header);
1534 skip_header_bytes -= 2;
1535 } else {
1536 encaps_data = NULL;
1537 encaps_len = 0;
1538 }
1539
1540 skb_pull(skb, skip_header_bytes);
1541 nh_pos -= skip_header_bytes;
1542 h_pos -= skip_header_bytes;
1543
1544 /* TODO: implement support for fragments so that there is no need to
1545 * reallocate and copy payload; it might be enough to support one
1546 * extra fragment that would be copied in the beginning of the frame
1547 * data.. anyway, it would be nice to include this into skb structure
1548 * somehow
1549 *
1550 * There are few options for this:
1551 * use skb->cb as an extra space for 802.11 header
1552 * allocate new buffer if not enough headroom
1553 * make sure that there is enough headroom in every skb by increasing
1554 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1555 * alloc_skb() (net/core/skbuff.c)
1556 */
1557 head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom;
1558 head_need -= skb_headroom(skb);
1559
1560 /* We are going to modify skb data, so make a copy of it if happens to
1561 * be cloned. This could happen, e.g., with Linux bridge code passing
1562 * us broadcast frames. */
1563
1564 if (head_need > 0 || skb_header_cloned(skb)) {
1565 #if 0
1566 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1567 "of headroom\n", dev->name, head_need);
1568 #endif
1569
1570 if (skb_header_cloned(skb))
1571 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1572 else
1573 I802_DEBUG_INC(local->tx_expand_skb_head);
1574 /* Since we have to reallocate the buffer, make sure that there
1575 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1576 * before payload and 12 after). */
1577 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1578 12, GFP_ATOMIC)) {
1579 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1580 "\n", dev->name);
1581 goto fail;
1582 }
1583 }
1584
1585 if (encaps_data) {
1586 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1587 nh_pos += encaps_len;
1588 h_pos += encaps_len;
1589 }
1590
1591 if (meshhdrlen > 0) {
1592 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1593 nh_pos += meshhdrlen;
1594 h_pos += meshhdrlen;
1595 }
1596
1597 if (fc & IEEE80211_STYPE_QOS_DATA) {
1598 __le16 *qos_control;
1599
1600 qos_control = (__le16*) skb_push(skb, 2);
1601 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1602 /*
1603 * Maybe we could actually set some fields here, for now just
1604 * initialise to zero to indicate no special operation.
1605 */
1606 *qos_control = 0;
1607 } else
1608 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1609
1610 nh_pos += hdrlen;
1611 h_pos += hdrlen;
1612
1613 info = IEEE80211_SKB_CB(skb);
1614 memset(info, 0, sizeof(*info));
1615 info->control.ifindex = dev->ifindex;
1616 if (ethertype == ETH_P_PAE)
1617 info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME;
1618
1619 /* Interfaces should always request a status report */
1620 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1621
1622 skb->dev = local->mdev;
1623 dev->stats.tx_packets++;
1624 dev->stats.tx_bytes += skb->len;
1625
1626 /* Update skb pointers to various headers since this modified frame
1627 * is going to go through Linux networking code that may potentially
1628 * need things like pointer to IP header. */
1629 skb_set_mac_header(skb, 0);
1630 skb_set_network_header(skb, nh_pos);
1631 skb_set_transport_header(skb, h_pos);
1632
1633 dev->trans_start = jiffies;
1634 dev_queue_xmit(skb);
1635
1636 return 0;
1637
1638 fail:
1639 if (!ret)
1640 dev_kfree_skb(skb);
1641
1642 return ret;
1643 }
1644
1645 /* helper functions for pending packets for when queues are stopped */
1646
1647 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1648 {
1649 int i, j;
1650 struct ieee80211_tx_stored_packet *store;
1651
1652 for (i = 0; i < local->hw.queues; i++) {
1653 if (!__ieee80211_queue_pending(local, i))
1654 continue;
1655 store = &local->pending_packet[i];
1656 kfree_skb(store->skb);
1657 for (j = 0; j < store->num_extra_frag; j++)
1658 kfree_skb(store->extra_frag[j]);
1659 kfree(store->extra_frag);
1660 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1661 }
1662 }
1663
1664 void ieee80211_tx_pending(unsigned long data)
1665 {
1666 struct ieee80211_local *local = (struct ieee80211_local *)data;
1667 struct net_device *dev = local->mdev;
1668 struct ieee80211_tx_stored_packet *store;
1669 struct ieee80211_tx_data tx;
1670 int i, ret, reschedule = 0;
1671
1672 netif_tx_lock_bh(dev);
1673 for (i = 0; i < local->hw.queues; i++) {
1674 if (__ieee80211_queue_stopped(local, i))
1675 continue;
1676 if (!__ieee80211_queue_pending(local, i)) {
1677 reschedule = 1;
1678 continue;
1679 }
1680 store = &local->pending_packet[i];
1681 tx.extra_frag = store->extra_frag;
1682 tx.num_extra_frag = store->num_extra_frag;
1683 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1684 tx.flags = 0;
1685 if (store->last_frag_rate_ctrl_probe)
1686 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1687 ret = __ieee80211_tx(local, store->skb, &tx);
1688 if (ret) {
1689 if (ret == IEEE80211_TX_FRAG_AGAIN)
1690 store->skb = NULL;
1691 } else {
1692 clear_bit(IEEE80211_LINK_STATE_PENDING,
1693 &local->state[i]);
1694 reschedule = 1;
1695 }
1696 }
1697 netif_tx_unlock_bh(dev);
1698 if (reschedule) {
1699 if (!ieee80211_qdisc_installed(dev)) {
1700 if (!__ieee80211_queue_stopped(local, 0))
1701 netif_wake_queue(dev);
1702 } else
1703 netif_schedule(dev);
1704 }
1705 }
1706
1707 /* functions for drivers to get certain frames */
1708
1709 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1710 struct ieee80211_if_ap *bss,
1711 struct sk_buff *skb,
1712 struct beacon_data *beacon)
1713 {
1714 u8 *pos, *tim;
1715 int aid0 = 0;
1716 int i, have_bits = 0, n1, n2;
1717
1718 /* Generate bitmap for TIM only if there are any STAs in power save
1719 * mode. */
1720 if (atomic_read(&bss->num_sta_ps) > 0)
1721 /* in the hope that this is faster than
1722 * checking byte-for-byte */
1723 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1724 IEEE80211_MAX_AID+1);
1725
1726 if (bss->dtim_count == 0)
1727 bss->dtim_count = beacon->dtim_period - 1;
1728 else
1729 bss->dtim_count--;
1730
1731 tim = pos = (u8 *) skb_put(skb, 6);
1732 *pos++ = WLAN_EID_TIM;
1733 *pos++ = 4;
1734 *pos++ = bss->dtim_count;
1735 *pos++ = beacon->dtim_period;
1736
1737 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1738 aid0 = 1;
1739
1740 if (have_bits) {
1741 /* Find largest even number N1 so that bits numbered 1 through
1742 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1743 * (N2 + 1) x 8 through 2007 are 0. */
1744 n1 = 0;
1745 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1746 if (bss->tim[i]) {
1747 n1 = i & 0xfe;
1748 break;
1749 }
1750 }
1751 n2 = n1;
1752 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1753 if (bss->tim[i]) {
1754 n2 = i;
1755 break;
1756 }
1757 }
1758
1759 /* Bitmap control */
1760 *pos++ = n1 | aid0;
1761 /* Part Virt Bitmap */
1762 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1763
1764 tim[1] = n2 - n1 + 4;
1765 skb_put(skb, n2 - n1);
1766 } else {
1767 *pos++ = aid0; /* Bitmap control */
1768 *pos++ = 0; /* Part Virt Bitmap */
1769 }
1770 }
1771
1772 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1773 struct ieee80211_vif *vif)
1774 {
1775 struct ieee80211_local *local = hw_to_local(hw);
1776 struct sk_buff *skb;
1777 struct ieee80211_tx_info *info;
1778 struct net_device *bdev;
1779 struct ieee80211_sub_if_data *sdata = NULL;
1780 struct ieee80211_if_ap *ap = NULL;
1781 struct rate_selection rsel;
1782 struct beacon_data *beacon;
1783 struct ieee80211_supported_band *sband;
1784 struct ieee80211_mgmt *mgmt;
1785 int *num_beacons;
1786 bool err = true;
1787 enum ieee80211_band band = local->hw.conf.channel->band;
1788 u8 *pos;
1789
1790 sband = local->hw.wiphy->bands[band];
1791
1792 rcu_read_lock();
1793
1794 sdata = vif_to_sdata(vif);
1795 bdev = sdata->dev;
1796
1797 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1798 ap = &sdata->u.ap;
1799 beacon = rcu_dereference(ap->beacon);
1800 if (ap && beacon) {
1801 /*
1802 * headroom, head length,
1803 * tail length and maximum TIM length
1804 */
1805 skb = dev_alloc_skb(local->tx_headroom +
1806 beacon->head_len +
1807 beacon->tail_len + 256);
1808 if (!skb)
1809 goto out;
1810
1811 skb_reserve(skb, local->tx_headroom);
1812 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1813 beacon->head_len);
1814
1815 ieee80211_include_sequence(sdata,
1816 (struct ieee80211_hdr *)skb->data);
1817
1818 /*
1819 * Not very nice, but we want to allow the driver to call
1820 * ieee80211_beacon_get() as a response to the set_tim()
1821 * callback. That, however, is already invoked under the
1822 * sta_lock to guarantee consistent and race-free update
1823 * of the tim bitmap in mac80211 and the driver.
1824 */
1825 if (local->tim_in_locked_section) {
1826 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1827 } else {
1828 unsigned long flags;
1829
1830 spin_lock_irqsave(&local->sta_lock, flags);
1831 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1832 spin_unlock_irqrestore(&local->sta_lock, flags);
1833 }
1834
1835 if (beacon->tail)
1836 memcpy(skb_put(skb, beacon->tail_len),
1837 beacon->tail, beacon->tail_len);
1838
1839 num_beacons = &ap->num_beacons;
1840
1841 err = false;
1842 }
1843 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1844 /* headroom, head length, tail length and maximum TIM length */
1845 skb = dev_alloc_skb(local->tx_headroom + 400);
1846 if (!skb)
1847 goto out;
1848
1849 skb_reserve(skb, local->hw.extra_tx_headroom);
1850 mgmt = (struct ieee80211_mgmt *)
1851 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1852 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1853 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1854 IEEE80211_STYPE_BEACON);
1855 memset(mgmt->da, 0xff, ETH_ALEN);
1856 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1857 /* BSSID is left zeroed, wildcard value */
1858 mgmt->u.beacon.beacon_int =
1859 cpu_to_le16(local->hw.conf.beacon_int);
1860 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1861
1862 pos = skb_put(skb, 2);
1863 *pos++ = WLAN_EID_SSID;
1864 *pos++ = 0x0;
1865
1866 mesh_mgmt_ies_add(skb, sdata->dev);
1867
1868 num_beacons = &sdata->u.sta.num_beacons;
1869
1870 err = false;
1871 }
1872
1873 if (err) {
1874 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1875 if (net_ratelimit())
1876 printk(KERN_DEBUG "no beacon data avail for %s\n",
1877 bdev->name);
1878 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1879 skb = NULL;
1880 goto out;
1881 }
1882
1883 info = IEEE80211_SKB_CB(skb);
1884
1885 info->band = band;
1886 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1887
1888 if (unlikely(rsel.rate_idx < 0)) {
1889 if (net_ratelimit()) {
1890 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1891 "no rate found\n",
1892 wiphy_name(local->hw.wiphy));
1893 }
1894 dev_kfree_skb(skb);
1895 skb = NULL;
1896 goto out;
1897 }
1898
1899 info->control.vif = vif;
1900 info->tx_rate_idx = rsel.rate_idx;
1901 if (sdata->bss_conf.use_short_preamble &&
1902 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1903 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1904 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1905 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1906 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1907 info->control.retry_limit = 1;
1908 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1909 (*num_beacons)++;
1910 out:
1911 rcu_read_unlock();
1912 return skb;
1913 }
1914 EXPORT_SYMBOL(ieee80211_beacon_get);
1915
1916 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1917 const void *frame, size_t frame_len,
1918 const struct ieee80211_tx_info *frame_txctl,
1919 struct ieee80211_rts *rts)
1920 {
1921 const struct ieee80211_hdr *hdr = frame;
1922 u16 fctl;
1923
1924 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1925 rts->frame_control = cpu_to_le16(fctl);
1926 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1927 frame_txctl);
1928 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1929 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1930 }
1931 EXPORT_SYMBOL(ieee80211_rts_get);
1932
1933 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1934 const void *frame, size_t frame_len,
1935 const struct ieee80211_tx_info *frame_txctl,
1936 struct ieee80211_cts *cts)
1937 {
1938 const struct ieee80211_hdr *hdr = frame;
1939 u16 fctl;
1940
1941 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1942 cts->frame_control = cpu_to_le16(fctl);
1943 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1944 frame_len, frame_txctl);
1945 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1946 }
1947 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1948
1949 struct sk_buff *
1950 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1951 struct ieee80211_vif *vif)
1952 {
1953 struct ieee80211_local *local = hw_to_local(hw);
1954 struct sk_buff *skb;
1955 struct sta_info *sta;
1956 ieee80211_tx_handler *handler;
1957 struct ieee80211_tx_data tx;
1958 ieee80211_tx_result res = TX_DROP;
1959 struct net_device *bdev;
1960 struct ieee80211_sub_if_data *sdata;
1961 struct ieee80211_if_ap *bss = NULL;
1962 struct beacon_data *beacon;
1963 struct ieee80211_tx_info *info;
1964
1965 sdata = vif_to_sdata(vif);
1966 bdev = sdata->dev;
1967
1968
1969 if (!bss)
1970 return NULL;
1971
1972 rcu_read_lock();
1973 beacon = rcu_dereference(bss->beacon);
1974
1975 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1976 !beacon->head) {
1977 rcu_read_unlock();
1978 return NULL;
1979 }
1980
1981 if (bss->dtim_count != 0)
1982 return NULL; /* send buffered bc/mc only after DTIM beacon */
1983
1984 while (1) {
1985 skb = skb_dequeue(&bss->ps_bc_buf);
1986 if (!skb)
1987 return NULL;
1988 local->total_ps_buffered--;
1989
1990 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1991 struct ieee80211_hdr *hdr =
1992 (struct ieee80211_hdr *) skb->data;
1993 /* more buffered multicast/broadcast frames ==> set
1994 * MoreData flag in IEEE 802.11 header to inform PS
1995 * STAs */
1996 hdr->frame_control |=
1997 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1998 }
1999
2000 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2001 break;
2002 dev_kfree_skb_any(skb);
2003 }
2004
2005 info = IEEE80211_SKB_CB(skb);
2006
2007 sta = tx.sta;
2008 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2009 tx.channel = local->hw.conf.channel;
2010 info->band = tx.channel->band;
2011
2012 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
2013 res = (*handler)(&tx);
2014 if (res == TX_DROP || res == TX_QUEUED)
2015 break;
2016 }
2017
2018 if (WARN_ON(tx.skb != skb))
2019 return NULL;
2020
2021 if (res == TX_DROP) {
2022 I802_DEBUG_INC(local->tx_handlers_drop);
2023 dev_kfree_skb(skb);
2024 skb = NULL;
2025 } else if (res == TX_QUEUED) {
2026 I802_DEBUG_INC(local->tx_handlers_queued);
2027 skb = NULL;
2028 }
2029
2030 rcu_read_unlock();
2031
2032 return skb;
2033 }
2034 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux kernel - Deliverables
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