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[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 /*
677 * Warn when submitting a fragmented A-MPDU frame and drop it.
678 * This is an error and needs to be fixed elsewhere, but when
679 * done needs to take care of monitor interfaces (injection)
680 * etc.
681 */
682 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
683 IEEE80211_SKB_CB(tx->skb)->queue >= tx->local->hw.queues))
684 return TX_DROP;
685
686 first = tx->skb;
687
688 hdrlen = ieee80211_get_hdrlen(tx->fc);
689 payload_len = first->len - hdrlen;
690 per_fragm = frag_threshold - hdrlen - FCS_LEN;
691 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
692
693 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
694 if (!frags)
695 goto fail;
696
697 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
698 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
699 pos = first->data + hdrlen + per_fragm;
700 left = payload_len - per_fragm;
701 for (i = 0; i < num_fragm - 1; i++) {
702 struct ieee80211_hdr *fhdr;
703 size_t copylen;
704
705 if (left <= 0)
706 goto fail;
707
708 /* reserve enough extra head and tail room for possible
709 * encryption */
710 frag = frags[i] =
711 dev_alloc_skb(tx->local->tx_headroom +
712 frag_threshold +
713 IEEE80211_ENCRYPT_HEADROOM +
714 IEEE80211_ENCRYPT_TAILROOM);
715 if (!frag)
716 goto fail;
717 /* Make sure that all fragments use the same priority so
718 * that they end up using the same TX queue */
719 frag->priority = first->priority;
720 skb_reserve(frag, tx->local->tx_headroom +
721 IEEE80211_ENCRYPT_HEADROOM);
722 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
723 memcpy(fhdr, first->data, hdrlen);
724 if (i == num_fragm - 2)
725 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
726 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
727 copylen = left > per_fragm ? per_fragm : left;
728 memcpy(skb_put(frag, copylen), pos, copylen);
729
730 pos += copylen;
731 left -= copylen;
732 }
733 skb_trim(first, hdrlen + per_fragm);
734
735 tx->num_extra_frag = num_fragm - 1;
736 tx->extra_frag = frags;
737
738 return TX_CONTINUE;
739
740 fail:
741 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
742 if (frags) {
743 for (i = 0; i < num_fragm - 1; i++)
744 if (frags[i])
745 dev_kfree_skb(frags[i]);
746 kfree(frags);
747 }
748 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
749 return TX_DROP;
750 }
751
752 static ieee80211_tx_result
753 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
754 {
755 if (!tx->key)
756 return TX_CONTINUE;
757
758 switch (tx->key->conf.alg) {
759 case ALG_WEP:
760 return ieee80211_crypto_wep_encrypt(tx);
761 case ALG_TKIP:
762 return ieee80211_crypto_tkip_encrypt(tx);
763 case ALG_CCMP:
764 return ieee80211_crypto_ccmp_encrypt(tx);
765 }
766
767 /* not reached */
768 WARN_ON(1);
769 return TX_DROP;
770 }
771
772 static ieee80211_tx_result
773 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
774 {
775 struct ieee80211_local *local = tx->local;
776 struct sk_buff *skb = tx->skb;
777 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
778 u32 load = 0, hdrtime;
779 struct ieee80211_rate *rate;
780 struct ieee80211_supported_band *sband;
781 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
782
783 sband = tx->local->hw.wiphy->bands[tx->channel->band];
784 rate = &sband->bitrates[tx->rate_idx];
785
786 /* TODO: this could be part of tx_status handling, so that the number
787 * of retries would be known; TX rate should in that case be stored
788 * somewhere with the packet */
789
790 /* Estimate total channel use caused by this frame */
791
792 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
793 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
794
795 if (tx->channel->band == IEEE80211_BAND_5GHZ ||
796 (tx->channel->band == IEEE80211_BAND_2GHZ &&
797 rate->flags & IEEE80211_RATE_ERP_G))
798 hdrtime = CHAN_UTIL_HDR_SHORT;
799 else
800 hdrtime = CHAN_UTIL_HDR_LONG;
801
802 load = hdrtime;
803 if (!is_multicast_ether_addr(hdr->addr1))
804 load += hdrtime;
805
806 if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
807 load += 2 * hdrtime;
808 else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
809 load += hdrtime;
810
811 /* TODO: optimise again */
812 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
813
814 if (tx->extra_frag) {
815 int i;
816 for (i = 0; i < tx->num_extra_frag; i++) {
817 load += 2 * hdrtime;
818 load += tx->extra_frag[i]->len *
819 rate->bitrate;
820 }
821 }
822
823 /* Divide channel_use by 8 to avoid wrapping around the counter */
824 load >>= CHAN_UTIL_SHIFT;
825 local->channel_use_raw += load;
826 if (tx->sta)
827 tx->sta->channel_use_raw += load;
828 tx->sdata->channel_use_raw += load;
829
830 if (tx->sta) {
831 tx->sta->tx_packets++;
832 tx->sta->tx_fragments++;
833 tx->sta->tx_bytes += tx->skb->len;
834 if (tx->extra_frag) {
835 int i;
836 tx->sta->tx_fragments += tx->num_extra_frag;
837 for (i = 0; i < tx->num_extra_frag; i++) {
838 tx->sta->tx_bytes +=
839 tx->extra_frag[i]->len;
840 }
841 }
842 }
843
844 return TX_CONTINUE;
845 }
846
847
848 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *);
849 static ieee80211_tx_handler ieee80211_tx_handlers[] =
850 {
851 ieee80211_tx_h_check_assoc,
852 ieee80211_tx_h_sequence,
853 ieee80211_tx_h_ps_buf,
854 ieee80211_tx_h_select_key,
855 ieee80211_tx_h_michael_mic_add,
856 ieee80211_tx_h_rate_ctrl,
857 ieee80211_tx_h_misc,
858 ieee80211_tx_h_fragment,
859 /* handlers after fragment must be aware of tx info fragmentation! */
860 ieee80211_tx_h_encrypt,
861 ieee80211_tx_h_stats,
862 NULL
863 };
864
865 /* actual transmit path */
866
867 /*
868 * deal with packet injection down monitor interface
869 * with Radiotap Header -- only called for monitor mode interface
870 */
871 static ieee80211_tx_result
872 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
873 struct sk_buff *skb)
874 {
875 /*
876 * this is the moment to interpret and discard the radiotap header that
877 * must be at the start of the packet injected in Monitor mode
878 *
879 * Need to take some care with endian-ness since radiotap
880 * args are little-endian
881 */
882
883 struct ieee80211_radiotap_iterator iterator;
884 struct ieee80211_radiotap_header *rthdr =
885 (struct ieee80211_radiotap_header *) skb->data;
886 struct ieee80211_supported_band *sband;
887 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
888 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
889
890 sband = tx->local->hw.wiphy->bands[tx->channel->band];
891
892 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
893 info->flags |= IEEE80211_TX_CTL_INJECTED;
894 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
895
896 /*
897 * for every radiotap entry that is present
898 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
899 * entries present, or -EINVAL on error)
900 */
901
902 while (!ret) {
903 int i, target_rate;
904
905 ret = ieee80211_radiotap_iterator_next(&iterator);
906
907 if (ret)
908 continue;
909
910 /* see if this argument is something we can use */
911 switch (iterator.this_arg_index) {
912 /*
913 * You must take care when dereferencing iterator.this_arg
914 * for multibyte types... the pointer is not aligned. Use
915 * get_unaligned((type *)iterator.this_arg) to dereference
916 * iterator.this_arg for type "type" safely on all arches.
917 */
918 case IEEE80211_RADIOTAP_RATE:
919 /*
920 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
921 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
922 */
923 target_rate = (*iterator.this_arg) * 5;
924 for (i = 0; i < sband->n_bitrates; i++) {
925 struct ieee80211_rate *r;
926
927 r = &sband->bitrates[i];
928
929 if (r->bitrate == target_rate) {
930 tx->rate_idx = i;
931 break;
932 }
933 }
934 break;
935
936 case IEEE80211_RADIOTAP_ANTENNA:
937 /*
938 * radiotap uses 0 for 1st ant, mac80211 is 1 for
939 * 1st ant
940 */
941 info->antenna_sel_tx = (*iterator.this_arg) + 1;
942 break;
943
944 #if 0
945 case IEEE80211_RADIOTAP_DBM_TX_POWER:
946 control->power_level = *iterator.this_arg;
947 break;
948 #endif
949
950 case IEEE80211_RADIOTAP_FLAGS:
951 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
952 /*
953 * this indicates that the skb we have been
954 * handed has the 32-bit FCS CRC at the end...
955 * we should react to that by snipping it off
956 * because it will be recomputed and added
957 * on transmission
958 */
959 if (skb->len < (iterator.max_length + FCS_LEN))
960 return TX_DROP;
961
962 skb_trim(skb, skb->len - FCS_LEN);
963 }
964 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
965 info->flags &=
966 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
967 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
968 tx->flags |= IEEE80211_TX_FRAGMENTED;
969 break;
970
971 /*
972 * Please update the file
973 * Documentation/networking/mac80211-injection.txt
974 * when parsing new fields here.
975 */
976
977 default:
978 break;
979 }
980 }
981
982 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
983 return TX_DROP;
984
985 /*
986 * remove the radiotap header
987 * iterator->max_length was sanity-checked against
988 * skb->len by iterator init
989 */
990 skb_pull(skb, iterator.max_length);
991
992 return TX_CONTINUE;
993 }
994
995 /*
996 * initialises @tx
997 */
998 static ieee80211_tx_result
999 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1000 struct sk_buff *skb,
1001 struct net_device *dev)
1002 {
1003 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1004 struct ieee80211_hdr *hdr;
1005 struct ieee80211_sub_if_data *sdata;
1006 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1007
1008 int hdrlen;
1009
1010 memset(tx, 0, sizeof(*tx));
1011 tx->skb = skb;
1012 tx->dev = dev; /* use original interface */
1013 tx->local = local;
1014 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1015 tx->channel = local->hw.conf.channel;
1016 /*
1017 * Set this flag (used below to indicate "automatic fragmentation"),
1018 * it will be cleared/left by radiotap as desired.
1019 */
1020 tx->flags |= IEEE80211_TX_FRAGMENTED;
1021
1022 /* process and remove the injection radiotap header */
1023 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1024 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
1025 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
1026 return TX_DROP;
1027
1028 /*
1029 * __ieee80211_parse_tx_radiotap has now removed
1030 * the radiotap header that was present and pre-filled
1031 * 'tx' with tx control information.
1032 */
1033 }
1034
1035 hdr = (struct ieee80211_hdr *) skb->data;
1036
1037 tx->sta = sta_info_get(local, hdr->addr1);
1038 tx->fc = le16_to_cpu(hdr->frame_control);
1039
1040 if (is_multicast_ether_addr(hdr->addr1)) {
1041 tx->flags &= ~IEEE80211_TX_UNICAST;
1042 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1043 } else {
1044 tx->flags |= IEEE80211_TX_UNICAST;
1045 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1046 }
1047
1048 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1049 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1050 skb->len + FCS_LEN > local->fragmentation_threshold &&
1051 !local->ops->set_frag_threshold)
1052 tx->flags |= IEEE80211_TX_FRAGMENTED;
1053 else
1054 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1055 }
1056
1057 if (!tx->sta)
1058 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1059 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1060 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1061
1062 hdrlen = ieee80211_get_hdrlen(tx->fc);
1063 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1064 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1065 tx->ethertype = (pos[0] << 8) | pos[1];
1066 }
1067 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1068
1069 return TX_CONTINUE;
1070 }
1071
1072 /*
1073 * NB: @tx is uninitialised when passed in here
1074 */
1075 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1076 struct sk_buff *skb,
1077 struct net_device *mdev)
1078 {
1079 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1080 struct net_device *dev;
1081
1082 dev = dev_get_by_index(&init_net, info->control.ifindex);
1083 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1084 dev_put(dev);
1085 dev = NULL;
1086 }
1087 if (unlikely(!dev))
1088 return -ENODEV;
1089 /* initialises tx with control */
1090 __ieee80211_tx_prepare(tx, skb, dev);
1091 dev_put(dev);
1092 return 0;
1093 }
1094
1095 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1096 struct ieee80211_tx_data *tx)
1097 {
1098 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1099 int ret, i;
1100
1101 if (!ieee80211_qdisc_installed(local->mdev) &&
1102 __ieee80211_queue_stopped(local, 0)) {
1103 netif_stop_queue(local->mdev);
1104 return IEEE80211_TX_AGAIN;
1105 }
1106 if (skb) {
1107 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1108 "TX to low-level driver", skb);
1109 ret = local->ops->tx(local_to_hw(local), skb);
1110 if (ret)
1111 return IEEE80211_TX_AGAIN;
1112 local->mdev->trans_start = jiffies;
1113 ieee80211_led_tx(local, 1);
1114 }
1115 if (tx->extra_frag) {
1116 for (i = 0; i < tx->num_extra_frag; i++) {
1117 if (!tx->extra_frag[i])
1118 continue;
1119 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1120 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1121 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1122 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1123 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1124 if (__ieee80211_queue_stopped(local, info->queue))
1125 return IEEE80211_TX_FRAG_AGAIN;
1126 if (i == tx->num_extra_frag) {
1127 info->tx_rate_idx = tx->last_frag_rate_idx;
1128
1129 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1130 info->flags |=
1131 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1132 else
1133 info->flags &=
1134 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1135 }
1136
1137 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1138 "TX to low-level driver",
1139 tx->extra_frag[i]);
1140 ret = local->ops->tx(local_to_hw(local),
1141 tx->extra_frag[i]);
1142 if (ret)
1143 return IEEE80211_TX_FRAG_AGAIN;
1144 local->mdev->trans_start = jiffies;
1145 ieee80211_led_tx(local, 1);
1146 tx->extra_frag[i] = NULL;
1147 }
1148 kfree(tx->extra_frag);
1149 tx->extra_frag = NULL;
1150 }
1151 return IEEE80211_TX_OK;
1152 }
1153
1154 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1155 {
1156 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1157 struct sta_info *sta;
1158 ieee80211_tx_handler *handler;
1159 struct ieee80211_tx_data tx;
1160 ieee80211_tx_result res = TX_DROP, res_prepare;
1161 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1162 int ret, i;
1163 int queue = info->queue;
1164
1165 WARN_ON(__ieee80211_queue_pending(local, queue));
1166
1167 if (unlikely(skb->len < 10)) {
1168 dev_kfree_skb(skb);
1169 return 0;
1170 }
1171
1172 rcu_read_lock();
1173
1174 /* initialises tx */
1175 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1176
1177 if (res_prepare == TX_DROP) {
1178 dev_kfree_skb(skb);
1179 rcu_read_unlock();
1180 return 0;
1181 }
1182
1183 sta = tx.sta;
1184 tx.channel = local->hw.conf.channel;
1185 info->band = tx.channel->band;
1186
1187 for (handler = ieee80211_tx_handlers; *handler != NULL;
1188 handler++) {
1189 res = (*handler)(&tx);
1190 if (res != TX_CONTINUE)
1191 break;
1192 }
1193
1194 if (WARN_ON(tx.skb != skb))
1195 goto drop;
1196
1197 if (unlikely(res == TX_DROP)) {
1198 I802_DEBUG_INC(local->tx_handlers_drop);
1199 goto drop;
1200 }
1201
1202 if (unlikely(res == TX_QUEUED)) {
1203 I802_DEBUG_INC(local->tx_handlers_queued);
1204 rcu_read_unlock();
1205 return 0;
1206 }
1207
1208 if (tx.extra_frag) {
1209 for (i = 0; i < tx.num_extra_frag; i++) {
1210 int next_len, dur;
1211 struct ieee80211_hdr *hdr =
1212 (struct ieee80211_hdr *)
1213 tx.extra_frag[i]->data;
1214
1215 if (i + 1 < tx.num_extra_frag) {
1216 next_len = tx.extra_frag[i + 1]->len;
1217 } else {
1218 next_len = 0;
1219 tx.rate_idx = tx.last_frag_rate_idx;
1220 }
1221 dur = ieee80211_duration(&tx, 0, next_len);
1222 hdr->duration_id = cpu_to_le16(dur);
1223 }
1224 }
1225
1226 retry:
1227 ret = __ieee80211_tx(local, skb, &tx);
1228 if (ret) {
1229 struct ieee80211_tx_stored_packet *store;
1230
1231 /*
1232 * Since there are no fragmented frames on A-MPDU
1233 * queues, there's no reason for a driver to reject
1234 * a frame there, warn and drop it.
1235 */
1236 if (WARN_ON(queue >= local->hw.queues))
1237 goto drop;
1238
1239 store = &local->pending_packet[queue];
1240
1241 if (ret == IEEE80211_TX_FRAG_AGAIN)
1242 skb = NULL;
1243 set_bit(IEEE80211_LINK_STATE_PENDING,
1244 &local->state[queue]);
1245 smp_mb();
1246 /* When the driver gets out of buffers during sending of
1247 * fragments and calls ieee80211_stop_queue, there is
1248 * a small window between IEEE80211_LINK_STATE_XOFF and
1249 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1250 * gets available in that window (i.e. driver calls
1251 * ieee80211_wake_queue), we would end up with ieee80211_tx
1252 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1253 * continuing transmitting here when that situation is
1254 * possible to have happened. */
1255 if (!__ieee80211_queue_stopped(local, queue)) {
1256 clear_bit(IEEE80211_LINK_STATE_PENDING,
1257 &local->state[queue]);
1258 goto retry;
1259 }
1260 store->skb = skb;
1261 store->extra_frag = tx.extra_frag;
1262 store->num_extra_frag = tx.num_extra_frag;
1263 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1264 store->last_frag_rate_ctrl_probe =
1265 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1266 }
1267 rcu_read_unlock();
1268 return 0;
1269
1270 drop:
1271 if (skb)
1272 dev_kfree_skb(skb);
1273 for (i = 0; i < tx.num_extra_frag; i++)
1274 if (tx.extra_frag[i])
1275 dev_kfree_skb(tx.extra_frag[i]);
1276 kfree(tx.extra_frag);
1277 rcu_read_unlock();
1278 return 0;
1279 }
1280
1281 /* device xmit handlers */
1282
1283 int ieee80211_master_start_xmit(struct sk_buff *skb,
1284 struct net_device *dev)
1285 {
1286 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1287 struct net_device *odev = NULL;
1288 struct ieee80211_sub_if_data *osdata;
1289 int headroom;
1290 int ret;
1291
1292 if (info->control.ifindex)
1293 odev = dev_get_by_index(&init_net, info->control.ifindex);
1294 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1295 dev_put(odev);
1296 odev = NULL;
1297 }
1298 if (unlikely(!odev)) {
1299 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1300 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1301 "originating device\n", dev->name);
1302 #endif
1303 dev_kfree_skb(skb);
1304 return 0;
1305 }
1306
1307 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1308
1309 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1310 if (skb_headroom(skb) < headroom) {
1311 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1312 dev_kfree_skb(skb);
1313 dev_put(odev);
1314 return 0;
1315 }
1316 }
1317
1318 info->control.vif = &osdata->vif;
1319 ret = ieee80211_tx(odev, skb);
1320 dev_put(odev);
1321
1322 return ret;
1323 }
1324
1325 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1326 struct net_device *dev)
1327 {
1328 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1329 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1330 struct ieee80211_radiotap_header *prthdr =
1331 (struct ieee80211_radiotap_header *)skb->data;
1332 u16 len_rthdr;
1333
1334 /* check for not even having the fixed radiotap header part */
1335 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1336 goto fail; /* too short to be possibly valid */
1337
1338 /* is it a header version we can trust to find length from? */
1339 if (unlikely(prthdr->it_version))
1340 goto fail; /* only version 0 is supported */
1341
1342 /* then there must be a radiotap header with a length we can use */
1343 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1344
1345 /* does the skb contain enough to deliver on the alleged length? */
1346 if (unlikely(skb->len < len_rthdr))
1347 goto fail; /* skb too short for claimed rt header extent */
1348
1349 skb->dev = local->mdev;
1350
1351 /* needed because we set skb device to master */
1352 info->control.ifindex = dev->ifindex;
1353
1354 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1355 /* Interfaces should always request a status report */
1356 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1357
1358 /*
1359 * fix up the pointers accounting for the radiotap
1360 * header still being in there. We are being given
1361 * a precooked IEEE80211 header so no need for
1362 * normal processing
1363 */
1364 skb_set_mac_header(skb, len_rthdr);
1365 /*
1366 * these are just fixed to the end of the rt area since we
1367 * don't have any better information and at this point, nobody cares
1368 */
1369 skb_set_network_header(skb, len_rthdr);
1370 skb_set_transport_header(skb, len_rthdr);
1371
1372 /* pass the radiotap header up to the next stage intact */
1373 dev_queue_xmit(skb);
1374 return NETDEV_TX_OK;
1375
1376 fail:
1377 dev_kfree_skb(skb);
1378 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1379 }
1380
1381 /**
1382 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1383 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1384 * @skb: packet to be sent
1385 * @dev: incoming interface
1386 *
1387 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1388 * not be freed, and caller is responsible for either retrying later or freeing
1389 * skb).
1390 *
1391 * This function takes in an Ethernet header and encapsulates it with suitable
1392 * IEEE 802.11 header based on which interface the packet is coming in. The
1393 * encapsulated packet will then be passed to master interface, wlan#.11, for
1394 * transmission (through low-level driver).
1395 */
1396 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1397 struct net_device *dev)
1398 {
1399 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1400 struct ieee80211_tx_info *info;
1401 struct ieee80211_sub_if_data *sdata;
1402 int ret = 1, head_need;
1403 u16 ethertype, hdrlen, meshhdrlen = 0, fc;
1404 struct ieee80211_hdr hdr;
1405 struct ieee80211s_hdr mesh_hdr;
1406 const u8 *encaps_data;
1407 int encaps_len, skip_header_bytes;
1408 int nh_pos, h_pos;
1409 struct sta_info *sta;
1410 u32 sta_flags = 0;
1411
1412 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1413 if (unlikely(skb->len < ETH_HLEN)) {
1414 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1415 dev->name, skb->len);
1416 ret = 0;
1417 goto fail;
1418 }
1419
1420 nh_pos = skb_network_header(skb) - skb->data;
1421 h_pos = skb_transport_header(skb) - skb->data;
1422
1423 /* convert Ethernet header to proper 802.11 header (based on
1424 * operation mode) */
1425 ethertype = (skb->data[12] << 8) | skb->data[13];
1426 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1427
1428 switch (sdata->vif.type) {
1429 case IEEE80211_IF_TYPE_AP:
1430 case IEEE80211_IF_TYPE_VLAN:
1431 fc |= IEEE80211_FCTL_FROMDS;
1432 /* DA BSSID SA */
1433 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1434 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1435 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1436 hdrlen = 24;
1437 break;
1438 case IEEE80211_IF_TYPE_WDS:
1439 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1440 /* RA TA DA SA */
1441 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1442 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1443 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1444 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1445 hdrlen = 30;
1446 break;
1447 #ifdef CONFIG_MAC80211_MESH
1448 case IEEE80211_IF_TYPE_MESH_POINT:
1449 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1450 /* RA TA DA SA */
1451 if (is_multicast_ether_addr(skb->data))
1452 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1453 else if (mesh_nexthop_lookup(hdr.addr1, skb, dev))
1454 return 0;
1455 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1456 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1457 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1458 if (skb->pkt_type == PACKET_OTHERHOST) {
1459 /* Forwarded frame, keep mesh ttl and seqnum */
1460 struct ieee80211s_hdr *prev_meshhdr;
1461 prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb);
1462 meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr);
1463 memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen);
1464 sdata->u.sta.mshstats.fwded_frames++;
1465 } else {
1466 if (!sdata->u.sta.mshcfg.dot11MeshTTL) {
1467 /* Do not send frames with mesh_ttl == 0 */
1468 sdata->u.sta.mshstats.dropped_frames_ttl++;
1469 ret = 0;
1470 goto fail;
1471 }
1472 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1473 sdata);
1474 }
1475 hdrlen = 30;
1476 break;
1477 #endif
1478 case IEEE80211_IF_TYPE_STA:
1479 fc |= IEEE80211_FCTL_TODS;
1480 /* BSSID SA DA */
1481 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1482 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1483 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1484 hdrlen = 24;
1485 break;
1486 case IEEE80211_IF_TYPE_IBSS:
1487 /* DA SA BSSID */
1488 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1489 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1490 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1491 hdrlen = 24;
1492 break;
1493 default:
1494 ret = 0;
1495 goto fail;
1496 }
1497
1498 /*
1499 * There's no need to try to look up the destination
1500 * if it is a multicast address (which can only happen
1501 * in AP mode)
1502 */
1503 if (!is_multicast_ether_addr(hdr.addr1)) {
1504 rcu_read_lock();
1505 sta = sta_info_get(local, hdr.addr1);
1506 if (sta)
1507 sta_flags = get_sta_flags(sta);
1508 rcu_read_unlock();
1509 }
1510
1511 /* receiver and we are QoS enabled, use a QoS type frame */
1512 if (sta_flags & WLAN_STA_WME && local->hw.queues >= 4) {
1513 fc |= IEEE80211_STYPE_QOS_DATA;
1514 hdrlen += 2;
1515 }
1516
1517 /*
1518 * Drop unicast frames to unauthorised stations unless they are
1519 * EAPOL frames from the local station.
1520 */
1521 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1522 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1523 !(ethertype == ETH_P_PAE &&
1524 compare_ether_addr(dev->dev_addr,
1525 skb->data + ETH_ALEN) == 0))) {
1526 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1527 DECLARE_MAC_BUF(mac);
1528
1529 if (net_ratelimit())
1530 printk(KERN_DEBUG "%s: dropped frame to %s"
1531 " (unauthorized port)\n", dev->name,
1532 print_mac(mac, hdr.addr1));
1533 #endif
1534
1535 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1536
1537 ret = 0;
1538 goto fail;
1539 }
1540
1541 hdr.frame_control = cpu_to_le16(fc);
1542 hdr.duration_id = 0;
1543 hdr.seq_ctrl = 0;
1544
1545 skip_header_bytes = ETH_HLEN;
1546 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1547 encaps_data = bridge_tunnel_header;
1548 encaps_len = sizeof(bridge_tunnel_header);
1549 skip_header_bytes -= 2;
1550 } else if (ethertype >= 0x600) {
1551 encaps_data = rfc1042_header;
1552 encaps_len = sizeof(rfc1042_header);
1553 skip_header_bytes -= 2;
1554 } else {
1555 encaps_data = NULL;
1556 encaps_len = 0;
1557 }
1558
1559 skb_pull(skb, skip_header_bytes);
1560 nh_pos -= skip_header_bytes;
1561 h_pos -= skip_header_bytes;
1562
1563 /* TODO: implement support for fragments so that there is no need to
1564 * reallocate and copy payload; it might be enough to support one
1565 * extra fragment that would be copied in the beginning of the frame
1566 * data.. anyway, it would be nice to include this into skb structure
1567 * somehow
1568 *
1569 * There are few options for this:
1570 * use skb->cb as an extra space for 802.11 header
1571 * allocate new buffer if not enough headroom
1572 * make sure that there is enough headroom in every skb by increasing
1573 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1574 * alloc_skb() (net/core/skbuff.c)
1575 */
1576 head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom;
1577 head_need -= skb_headroom(skb);
1578
1579 /* We are going to modify skb data, so make a copy of it if happens to
1580 * be cloned. This could happen, e.g., with Linux bridge code passing
1581 * us broadcast frames. */
1582
1583 if (head_need > 0 || skb_header_cloned(skb)) {
1584 #if 0
1585 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1586 "of headroom\n", dev->name, head_need);
1587 #endif
1588
1589 if (skb_header_cloned(skb))
1590 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1591 else
1592 I802_DEBUG_INC(local->tx_expand_skb_head);
1593 /* Since we have to reallocate the buffer, make sure that there
1594 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1595 * before payload and 12 after). */
1596 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1597 12, GFP_ATOMIC)) {
1598 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1599 "\n", dev->name);
1600 goto fail;
1601 }
1602 }
1603
1604 if (encaps_data) {
1605 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1606 nh_pos += encaps_len;
1607 h_pos += encaps_len;
1608 }
1609
1610 if (meshhdrlen > 0) {
1611 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1612 nh_pos += meshhdrlen;
1613 h_pos += meshhdrlen;
1614 }
1615
1616 if (fc & IEEE80211_STYPE_QOS_DATA) {
1617 __le16 *qos_control;
1618
1619 qos_control = (__le16*) skb_push(skb, 2);
1620 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1621 /*
1622 * Maybe we could actually set some fields here, for now just
1623 * initialise to zero to indicate no special operation.
1624 */
1625 *qos_control = 0;
1626 } else
1627 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1628
1629 nh_pos += hdrlen;
1630 h_pos += hdrlen;
1631
1632 info = IEEE80211_SKB_CB(skb);
1633 memset(info, 0, sizeof(*info));
1634 info->control.ifindex = dev->ifindex;
1635 if (ethertype == ETH_P_PAE)
1636 info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME;
1637
1638 /* Interfaces should always request a status report */
1639 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1640
1641 skb->dev = local->mdev;
1642 dev->stats.tx_packets++;
1643 dev->stats.tx_bytes += skb->len;
1644
1645 /* Update skb pointers to various headers since this modified frame
1646 * is going to go through Linux networking code that may potentially
1647 * need things like pointer to IP header. */
1648 skb_set_mac_header(skb, 0);
1649 skb_set_network_header(skb, nh_pos);
1650 skb_set_transport_header(skb, h_pos);
1651
1652 dev->trans_start = jiffies;
1653 dev_queue_xmit(skb);
1654
1655 return 0;
1656
1657 fail:
1658 if (!ret)
1659 dev_kfree_skb(skb);
1660
1661 return ret;
1662 }
1663
1664 /* helper functions for pending packets for when queues are stopped */
1665
1666 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1667 {
1668 int i, j;
1669 struct ieee80211_tx_stored_packet *store;
1670
1671 for (i = 0; i < local->hw.queues; i++) {
1672 if (!__ieee80211_queue_pending(local, i))
1673 continue;
1674 store = &local->pending_packet[i];
1675 kfree_skb(store->skb);
1676 for (j = 0; j < store->num_extra_frag; j++)
1677 kfree_skb(store->extra_frag[j]);
1678 kfree(store->extra_frag);
1679 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1680 }
1681 }
1682
1683 void ieee80211_tx_pending(unsigned long data)
1684 {
1685 struct ieee80211_local *local = (struct ieee80211_local *)data;
1686 struct net_device *dev = local->mdev;
1687 struct ieee80211_tx_stored_packet *store;
1688 struct ieee80211_tx_data tx;
1689 int i, ret, reschedule = 0;
1690
1691 netif_tx_lock_bh(dev);
1692 for (i = 0; i < local->hw.queues; i++) {
1693 if (__ieee80211_queue_stopped(local, i))
1694 continue;
1695 if (!__ieee80211_queue_pending(local, i)) {
1696 reschedule = 1;
1697 continue;
1698 }
1699 store = &local->pending_packet[i];
1700 tx.extra_frag = store->extra_frag;
1701 tx.num_extra_frag = store->num_extra_frag;
1702 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1703 tx.flags = 0;
1704 if (store->last_frag_rate_ctrl_probe)
1705 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1706 ret = __ieee80211_tx(local, store->skb, &tx);
1707 if (ret) {
1708 if (ret == IEEE80211_TX_FRAG_AGAIN)
1709 store->skb = NULL;
1710 } else {
1711 clear_bit(IEEE80211_LINK_STATE_PENDING,
1712 &local->state[i]);
1713 reschedule = 1;
1714 }
1715 }
1716 netif_tx_unlock_bh(dev);
1717 if (reschedule) {
1718 if (!ieee80211_qdisc_installed(dev)) {
1719 if (!__ieee80211_queue_stopped(local, 0))
1720 netif_wake_queue(dev);
1721 } else
1722 netif_schedule(dev);
1723 }
1724 }
1725
1726 /* functions for drivers to get certain frames */
1727
1728 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1729 struct ieee80211_if_ap *bss,
1730 struct sk_buff *skb,
1731 struct beacon_data *beacon)
1732 {
1733 u8 *pos, *tim;
1734 int aid0 = 0;
1735 int i, have_bits = 0, n1, n2;
1736
1737 /* Generate bitmap for TIM only if there are any STAs in power save
1738 * mode. */
1739 if (atomic_read(&bss->num_sta_ps) > 0)
1740 /* in the hope that this is faster than
1741 * checking byte-for-byte */
1742 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1743 IEEE80211_MAX_AID+1);
1744
1745 if (bss->dtim_count == 0)
1746 bss->dtim_count = beacon->dtim_period - 1;
1747 else
1748 bss->dtim_count--;
1749
1750 tim = pos = (u8 *) skb_put(skb, 6);
1751 *pos++ = WLAN_EID_TIM;
1752 *pos++ = 4;
1753 *pos++ = bss->dtim_count;
1754 *pos++ = beacon->dtim_period;
1755
1756 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1757 aid0 = 1;
1758
1759 if (have_bits) {
1760 /* Find largest even number N1 so that bits numbered 1 through
1761 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1762 * (N2 + 1) x 8 through 2007 are 0. */
1763 n1 = 0;
1764 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1765 if (bss->tim[i]) {
1766 n1 = i & 0xfe;
1767 break;
1768 }
1769 }
1770 n2 = n1;
1771 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1772 if (bss->tim[i]) {
1773 n2 = i;
1774 break;
1775 }
1776 }
1777
1778 /* Bitmap control */
1779 *pos++ = n1 | aid0;
1780 /* Part Virt Bitmap */
1781 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1782
1783 tim[1] = n2 - n1 + 4;
1784 skb_put(skb, n2 - n1);
1785 } else {
1786 *pos++ = aid0; /* Bitmap control */
1787 *pos++ = 0; /* Part Virt Bitmap */
1788 }
1789 }
1790
1791 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1792 struct ieee80211_vif *vif)
1793 {
1794 struct ieee80211_local *local = hw_to_local(hw);
1795 struct sk_buff *skb;
1796 struct ieee80211_tx_info *info;
1797 struct net_device *bdev;
1798 struct ieee80211_sub_if_data *sdata = NULL;
1799 struct ieee80211_if_ap *ap = NULL;
1800 struct rate_selection rsel;
1801 struct beacon_data *beacon;
1802 struct ieee80211_supported_band *sband;
1803 struct ieee80211_mgmt *mgmt;
1804 int *num_beacons;
1805 bool err = true;
1806 enum ieee80211_band band = local->hw.conf.channel->band;
1807 u8 *pos;
1808
1809 sband = local->hw.wiphy->bands[band];
1810
1811 rcu_read_lock();
1812
1813 sdata = vif_to_sdata(vif);
1814 bdev = sdata->dev;
1815
1816 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1817 ap = &sdata->u.ap;
1818 beacon = rcu_dereference(ap->beacon);
1819 if (ap && beacon) {
1820 /*
1821 * headroom, head length,
1822 * tail length and maximum TIM length
1823 */
1824 skb = dev_alloc_skb(local->tx_headroom +
1825 beacon->head_len +
1826 beacon->tail_len + 256);
1827 if (!skb)
1828 goto out;
1829
1830 skb_reserve(skb, local->tx_headroom);
1831 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1832 beacon->head_len);
1833
1834 ieee80211_include_sequence(sdata,
1835 (struct ieee80211_hdr *)skb->data);
1836
1837 /*
1838 * Not very nice, but we want to allow the driver to call
1839 * ieee80211_beacon_get() as a response to the set_tim()
1840 * callback. That, however, is already invoked under the
1841 * sta_lock to guarantee consistent and race-free update
1842 * of the tim bitmap in mac80211 and the driver.
1843 */
1844 if (local->tim_in_locked_section) {
1845 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1846 } else {
1847 unsigned long flags;
1848
1849 spin_lock_irqsave(&local->sta_lock, flags);
1850 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1851 spin_unlock_irqrestore(&local->sta_lock, flags);
1852 }
1853
1854 if (beacon->tail)
1855 memcpy(skb_put(skb, beacon->tail_len),
1856 beacon->tail, beacon->tail_len);
1857
1858 num_beacons = &ap->num_beacons;
1859
1860 err = false;
1861 }
1862 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1863 /* headroom, head length, tail length and maximum TIM length */
1864 skb = dev_alloc_skb(local->tx_headroom + 400);
1865 if (!skb)
1866 goto out;
1867
1868 skb_reserve(skb, local->hw.extra_tx_headroom);
1869 mgmt = (struct ieee80211_mgmt *)
1870 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1871 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1872 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1873 IEEE80211_STYPE_BEACON);
1874 memset(mgmt->da, 0xff, ETH_ALEN);
1875 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1876 /* BSSID is left zeroed, wildcard value */
1877 mgmt->u.beacon.beacon_int =
1878 cpu_to_le16(local->hw.conf.beacon_int);
1879 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1880
1881 pos = skb_put(skb, 2);
1882 *pos++ = WLAN_EID_SSID;
1883 *pos++ = 0x0;
1884
1885 mesh_mgmt_ies_add(skb, sdata->dev);
1886
1887 num_beacons = &sdata->u.sta.num_beacons;
1888
1889 err = false;
1890 }
1891
1892 if (err) {
1893 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1894 if (net_ratelimit())
1895 printk(KERN_DEBUG "no beacon data avail for %s\n",
1896 bdev->name);
1897 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1898 skb = NULL;
1899 goto out;
1900 }
1901
1902 info = IEEE80211_SKB_CB(skb);
1903
1904 info->band = band;
1905 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1906
1907 if (unlikely(rsel.rate_idx < 0)) {
1908 if (net_ratelimit()) {
1909 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1910 "no rate found\n",
1911 wiphy_name(local->hw.wiphy));
1912 }
1913 dev_kfree_skb(skb);
1914 skb = NULL;
1915 goto out;
1916 }
1917
1918 info->control.vif = vif;
1919 info->tx_rate_idx = rsel.rate_idx;
1920 if (sdata->bss_conf.use_short_preamble &&
1921 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1922 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1923 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1924 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1925 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1926 info->control.retry_limit = 1;
1927 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1928 (*num_beacons)++;
1929 out:
1930 rcu_read_unlock();
1931 return skb;
1932 }
1933 EXPORT_SYMBOL(ieee80211_beacon_get);
1934
1935 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1936 const void *frame, size_t frame_len,
1937 const struct ieee80211_tx_info *frame_txctl,
1938 struct ieee80211_rts *rts)
1939 {
1940 const struct ieee80211_hdr *hdr = frame;
1941 u16 fctl;
1942
1943 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1944 rts->frame_control = cpu_to_le16(fctl);
1945 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1946 frame_txctl);
1947 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1948 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1949 }
1950 EXPORT_SYMBOL(ieee80211_rts_get);
1951
1952 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1953 const void *frame, size_t frame_len,
1954 const struct ieee80211_tx_info *frame_txctl,
1955 struct ieee80211_cts *cts)
1956 {
1957 const struct ieee80211_hdr *hdr = frame;
1958 u16 fctl;
1959
1960 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1961 cts->frame_control = cpu_to_le16(fctl);
1962 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1963 frame_len, frame_txctl);
1964 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1965 }
1966 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1967
1968 struct sk_buff *
1969 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1970 struct ieee80211_vif *vif)
1971 {
1972 struct ieee80211_local *local = hw_to_local(hw);
1973 struct sk_buff *skb;
1974 struct sta_info *sta;
1975 ieee80211_tx_handler *handler;
1976 struct ieee80211_tx_data tx;
1977 ieee80211_tx_result res = TX_DROP;
1978 struct net_device *bdev;
1979 struct ieee80211_sub_if_data *sdata;
1980 struct ieee80211_if_ap *bss = NULL;
1981 struct beacon_data *beacon;
1982 struct ieee80211_tx_info *info;
1983
1984 sdata = vif_to_sdata(vif);
1985 bdev = sdata->dev;
1986
1987
1988 if (!bss)
1989 return NULL;
1990
1991 rcu_read_lock();
1992 beacon = rcu_dereference(bss->beacon);
1993
1994 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1995 !beacon->head) {
1996 rcu_read_unlock();
1997 return NULL;
1998 }
1999
2000 if (bss->dtim_count != 0)
2001 return NULL; /* send buffered bc/mc only after DTIM beacon */
2002
2003 while (1) {
2004 skb = skb_dequeue(&bss->ps_bc_buf);
2005 if (!skb)
2006 return NULL;
2007 local->total_ps_buffered--;
2008
2009 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2010 struct ieee80211_hdr *hdr =
2011 (struct ieee80211_hdr *) skb->data;
2012 /* more buffered multicast/broadcast frames ==> set
2013 * MoreData flag in IEEE 802.11 header to inform PS
2014 * STAs */
2015 hdr->frame_control |=
2016 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2017 }
2018
2019 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2020 break;
2021 dev_kfree_skb_any(skb);
2022 }
2023
2024 info = IEEE80211_SKB_CB(skb);
2025
2026 sta = tx.sta;
2027 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2028 tx.channel = local->hw.conf.channel;
2029 info->band = tx.channel->band;
2030
2031 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
2032 res = (*handler)(&tx);
2033 if (res == TX_DROP || res == TX_QUEUED)
2034 break;
2035 }
2036
2037 if (WARN_ON(tx.skb != skb))
2038 return NULL;
2039
2040 if (res == TX_DROP) {
2041 I802_DEBUG_INC(local->tx_handlers_drop);
2042 dev_kfree_skb(skb);
2043 skb = NULL;
2044 } else if (res == TX_QUEUED) {
2045 I802_DEBUG_INC(local->tx_handlers_queued);
2046 skb = NULL;
2047 }
2048
2049 rcu_read_unlock();
2050
2051 return skb;
2052 }
2053 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux kernel - Deliverables
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