?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mac80211: split off mesh handling entirely
[firewire-audio.git] / net / mac80211 / tx.c
blob1059b17c83b07a7496b36be28cd7e117a6d48c7e
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 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
42 static void ieee80211_dump_frame(const char *ifname, const char *title,
43 const struct sk_buff *skb)
44 {
45 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
46 unsigned int hdrlen;
47 DECLARE_MAC_BUF(mac);
48
49 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
50 if (skb->len < 4) {
51 printk("\n");
52 return;
53 }
54
55 hdrlen = ieee80211_hdrlen(hdr->frame_control);
56 if (hdrlen > skb->len)
57 hdrlen = skb->len;
58 if (hdrlen >= 4)
59 printk(" FC=0x%04x DUR=0x%04x",
60 le16_to_cpu(hdr->frame_control), le16_to_cpu(hdr->duration_id));
61 if (hdrlen >= 10)
62 printk(" A1=%s", print_mac(mac, hdr->addr1));
63 if (hdrlen >= 16)
64 printk(" A2=%s", print_mac(mac, hdr->addr2));
65 if (hdrlen >= 24)
66 printk(" A3=%s", print_mac(mac, hdr->addr3));
67 if (hdrlen >= 30)
68 printk(" A4=%s", print_mac(mac, hdr->addr4));
69 printk("\n");
70 }
71 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
72 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
73 struct sk_buff *skb)
74 {
75 }
76 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
77
78 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
79 int next_frag_len)
80 {
81 int rate, mrate, erp, dur, i;
82 struct ieee80211_rate *txrate;
83 struct ieee80211_local *local = tx->local;
84 struct ieee80211_supported_band *sband;
85 struct ieee80211_hdr *hdr;
86
87 sband = local->hw.wiphy->bands[tx->channel->band];
88 txrate = &sband->bitrates[tx->rate_idx];
89
90 erp = 0;
91 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
92 erp = txrate->flags & IEEE80211_RATE_ERP_G;
93
94 /*
95 * data and mgmt (except PS Poll):
96 * - during CFP: 32768
97 * - during contention period:
98 * if addr1 is group address: 0
99 * if more fragments = 0 and addr1 is individual address: time to
100 * transmit one ACK plus SIFS
101 * if more fragments = 1 and addr1 is individual address: time to
102 * transmit next fragment plus 2 x ACK plus 3 x SIFS
103 *
104 * IEEE 802.11, 9.6:
105 * - control response frame (CTS or ACK) shall be transmitted using the
106 * same rate as the immediately previous frame in the frame exchange
107 * sequence, if this rate belongs to the PHY mandatory rates, or else
108 * at the highest possible rate belonging to the PHY rates in the
109 * BSSBasicRateSet
110 */
111 hdr = (struct ieee80211_hdr *)tx->skb->data;
112 if (ieee80211_is_ctl(hdr->frame_control)) {
113 /* TODO: These control frames are not currently sent by
114 * 80211.o, but should they be implemented, this function
115 * needs to be updated to support duration field calculation.
116 *
117 * RTS: time needed to transmit pending data/mgmt frame plus
118 * one CTS frame plus one ACK frame plus 3 x SIFS
119 * CTS: duration of immediately previous RTS minus time
120 * required to transmit CTS and its SIFS
121 * ACK: 0 if immediately previous directed data/mgmt had
122 * more=0, with more=1 duration in ACK frame is duration
123 * from previous frame minus time needed to transmit ACK
124 * and its SIFS
125 * PS Poll: BIT(15) | BIT(14) | aid
126 */
127 return 0;
128 }
129
130 /* data/mgmt */
131 if (0 /* FIX: data/mgmt during CFP */)
132 return cpu_to_le16(32768);
133
134 if (group_addr) /* Group address as the destination - no ACK */
135 return 0;
136
137 /* Individual destination address:
138 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
139 * CTS and ACK frames shall be transmitted using the highest rate in
140 * basic rate set that is less than or equal to the rate of the
141 * immediately previous frame and that is using the same modulation
142 * (CCK or OFDM). If no basic rate set matches with these requirements,
143 * the highest mandatory rate of the PHY that is less than or equal to
144 * the rate of the previous frame is used.
145 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
146 */
147 rate = -1;
148 /* use lowest available if everything fails */
149 mrate = sband->bitrates[0].bitrate;
150 for (i = 0; i < sband->n_bitrates; i++) {
151 struct ieee80211_rate *r = &sband->bitrates[i];
152
153 if (r->bitrate > txrate->bitrate)
154 break;
155
156 if (tx->sdata->basic_rates & BIT(i))
157 rate = r->bitrate;
158
159 switch (sband->band) {
160 case IEEE80211_BAND_2GHZ: {
161 u32 flag;
162 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
163 flag = IEEE80211_RATE_MANDATORY_G;
164 else
165 flag = IEEE80211_RATE_MANDATORY_B;
166 if (r->flags & flag)
167 mrate = r->bitrate;
168 break;
169 }
170 case IEEE80211_BAND_5GHZ:
171 if (r->flags & IEEE80211_RATE_MANDATORY_A)
172 mrate = r->bitrate;
173 break;
174 case IEEE80211_NUM_BANDS:
175 WARN_ON(1);
176 break;
177 }
178 }
179 if (rate == -1) {
180 /* No matching basic rate found; use highest suitable mandatory
181 * PHY rate */
182 rate = mrate;
183 }
184
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
188
189 dur = ieee80211_frame_duration(local, 10, rate, erp,
190 tx->sdata->bss_conf.use_short_preamble);
191
192 if (next_frag_len) {
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
196 /* next fragment */
197 dur += ieee80211_frame_duration(local, next_frag_len,
198 txrate->bitrate, erp,
199 tx->sdata->bss_conf.use_short_preamble);
200 }
201
202 return cpu_to_le16(dur);
203 }
204
205 static int inline is_ieee80211_device(struct net_device *dev,
206 struct net_device *master)
207 {
208 return (wdev_priv(dev->ieee80211_ptr) ==
209 wdev_priv(master->ieee80211_ptr));
210 }
211
212 /* tx handlers */
213
214 static ieee80211_tx_result debug_noinline
215 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
216 {
217
218 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
220 u32 sta_flags;
221
222 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
223 return TX_CONTINUE;
224
225 if (unlikely(tx->local->sta_sw_scanning) &&
226 !ieee80211_is_probe_req(hdr->frame_control))
227 return TX_DROP;
228
229 if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT)
230 return TX_CONTINUE;
231
232 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
233 return TX_CONTINUE;
234
235 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
236
237 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
238 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
239 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
240 ieee80211_is_data(hdr->frame_control))) {
241 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
242 DECLARE_MAC_BUF(mac);
243 printk(KERN_DEBUG "%s: dropped data frame to not "
244 "associated station %s\n",
245 tx->dev->name, print_mac(mac, hdr->addr1));
246 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
247 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
248 return TX_DROP;
249 }
250 } else {
251 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
252 tx->local->num_sta == 0 &&
253 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
254 /*
255 * No associated STAs - no need to send multicast
256 * frames.
257 */
258 return TX_DROP;
259 }
260 return TX_CONTINUE;
261 }
262
263 return TX_CONTINUE;
264 }
265
266 /* This function is called whenever the AP is about to exceed the maximum limit
267 * of buffered frames for power saving STAs. This situation should not really
268 * happen often during normal operation, so dropping the oldest buffered packet
269 * from each queue should be OK to make some room for new frames. */
270 static void purge_old_ps_buffers(struct ieee80211_local *local)
271 {
272 int total = 0, purged = 0;
273 struct sk_buff *skb;
274 struct ieee80211_sub_if_data *sdata;
275 struct sta_info *sta;
276
277 /*
278 * virtual interfaces are protected by RCU
279 */
280 rcu_read_lock();
281
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
283 struct ieee80211_if_ap *ap;
284 if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
285 continue;
286 ap = &sdata->u.ap;
287 skb = skb_dequeue(&ap->ps_bc_buf);
288 if (skb) {
289 purged++;
290 dev_kfree_skb(skb);
291 }
292 total += skb_queue_len(&ap->ps_bc_buf);
293 }
294
295 list_for_each_entry_rcu(sta, &local->sta_list, list) {
296 skb = skb_dequeue(&sta->ps_tx_buf);
297 if (skb) {
298 purged++;
299 dev_kfree_skb(skb);
300 }
301 total += skb_queue_len(&sta->ps_tx_buf);
302 }
303
304 rcu_read_unlock();
305
306 local->total_ps_buffered = total;
307 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
308 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
309 wiphy_name(local->hw.wiphy), purged);
310 #endif
311 }
312
313 static ieee80211_tx_result
314 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
315 {
316 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
318
319 /*
320 * broadcast/multicast frame
321 *
322 * If any of the associated stations is in power save mode,
323 * the frame is buffered to be sent after DTIM beacon frame.
324 * This is done either by the hardware or us.
325 */
326
327 /* powersaving STAs only in AP/VLAN mode */
328 if (!tx->sdata->bss)
329 return TX_CONTINUE;
330
331 /* no buffering for ordered frames */
332 if (ieee80211_has_order(hdr->frame_control))
333 return TX_CONTINUE;
334
335 /* no stations in PS mode */
336 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
337 return TX_CONTINUE;
338
339 /* buffered in mac80211 */
340 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
341 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
342 purge_old_ps_buffers(tx->local);
343 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
344 AP_MAX_BC_BUFFER) {
345 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
346 if (net_ratelimit()) {
347 printk(KERN_DEBUG "%s: BC TX buffer full - "
348 "dropping the oldest frame\n",
349 tx->dev->name);
350 }
351 #endif
352 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
353 } else
354 tx->local->total_ps_buffered++;
355 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
356 return TX_QUEUED;
357 }
358
359 /* buffered in hardware */
360 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
361
362 return TX_CONTINUE;
363 }
364
365 static ieee80211_tx_result
366 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
367 {
368 struct sta_info *sta = tx->sta;
369 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
370 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
371 u32 staflags;
372 DECLARE_MAC_BUF(mac);
373
374 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
375 return TX_CONTINUE;
376
377 staflags = get_sta_flags(sta);
378
379 if (unlikely((staflags & WLAN_STA_PS) &&
380 !(staflags & WLAN_STA_PSPOLL))) {
381 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
382 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
383 "before %d)\n",
384 print_mac(mac, sta->addr), sta->aid,
385 skb_queue_len(&sta->ps_tx_buf));
386 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
387 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
388 purge_old_ps_buffers(tx->local);
389 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
390 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
391 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
392 if (net_ratelimit()) {
393 printk(KERN_DEBUG "%s: STA %s TX "
394 "buffer full - dropping oldest frame\n",
395 tx->dev->name, print_mac(mac, sta->addr));
396 }
397 #endif
398 dev_kfree_skb(old);
399 } else
400 tx->local->total_ps_buffered++;
401
402 /* Queue frame to be sent after STA sends an PS Poll frame */
403 if (skb_queue_empty(&sta->ps_tx_buf))
404 sta_info_set_tim_bit(sta);
405
406 info->control.jiffies = jiffies;
407 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
408 return TX_QUEUED;
409 }
410 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
411 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
412 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
413 "set -> send frame\n", tx->dev->name,
414 print_mac(mac, sta->addr));
415 }
416 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
417 clear_sta_flags(sta, WLAN_STA_PSPOLL);
418
419 return TX_CONTINUE;
420 }
421
422 static ieee80211_tx_result debug_noinline
423 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
424 {
425 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
426 return TX_CONTINUE;
427
428 if (tx->flags & IEEE80211_TX_UNICAST)
429 return ieee80211_tx_h_unicast_ps_buf(tx);
430 else
431 return ieee80211_tx_h_multicast_ps_buf(tx);
432 }
433
434 static ieee80211_tx_result debug_noinline
435 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
436 {
437 struct ieee80211_key *key;
438 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
439 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
440
441 if (unlikely(tx->skb->do_not_encrypt))
442 tx->key = NULL;
443 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
444 tx->key = key;
445 else if ((key = rcu_dereference(tx->sdata->default_key)))
446 tx->key = key;
447 else if (tx->sdata->drop_unencrypted &&
448 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
449 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
450 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
451 return TX_DROP;
452 } else
453 tx->key = NULL;
454
455 if (tx->key) {
456 tx->key->tx_rx_count++;
457 /* TODO: add threshold stuff again */
458
459 switch (tx->key->conf.alg) {
460 case ALG_WEP:
461 if (ieee80211_is_auth(hdr->frame_control))
462 break;
463 case ALG_TKIP:
464 case ALG_CCMP:
465 if (!ieee80211_is_data_present(hdr->frame_control))
466 tx->key = NULL;
467 break;
468 }
469 }
470
471 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
472 tx->skb->do_not_encrypt = 1;
473
474 return TX_CONTINUE;
475 }
476
477 static ieee80211_tx_result debug_noinline
478 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
479 {
480 struct rate_selection rsel;
481 struct ieee80211_supported_band *sband;
482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
483
484 sband = tx->local->hw.wiphy->bands[tx->channel->band];
485
486 if (likely(tx->rate_idx < 0)) {
487 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
488 tx->rate_idx = rsel.rate_idx;
489 if (unlikely(rsel.probe_idx >= 0)) {
490 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
491 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
492 info->control.alt_retry_rate_idx = tx->rate_idx;
493 tx->rate_idx = rsel.probe_idx;
494 } else
495 info->control.alt_retry_rate_idx = -1;
496
497 if (unlikely(tx->rate_idx < 0))
498 return TX_DROP;
499 } else
500 info->control.alt_retry_rate_idx = -1;
501
502 if (tx->sdata->bss_conf.use_cts_prot &&
503 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
504 tx->last_frag_rate_idx = tx->rate_idx;
505 if (rsel.probe_idx >= 0)
506 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
507 else
508 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
509 tx->rate_idx = rsel.nonerp_idx;
510 info->tx_rate_idx = rsel.nonerp_idx;
511 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
512 } else {
513 tx->last_frag_rate_idx = tx->rate_idx;
514 info->tx_rate_idx = tx->rate_idx;
515 }
516 info->tx_rate_idx = tx->rate_idx;
517
518 return TX_CONTINUE;
519 }
520
521 static ieee80211_tx_result debug_noinline
522 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
523 {
524 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
525 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
526 struct ieee80211_supported_band *sband;
527
528 sband = tx->local->hw.wiphy->bands[tx->channel->band];
529
530 if (tx->sta)
531 info->control.aid = tx->sta->aid;
532
533 if (!info->control.retry_limit) {
534 if (!is_multicast_ether_addr(hdr->addr1)) {
535 int len = min_t(int, tx->skb->len + FCS_LEN,
536 tx->local->fragmentation_threshold);
537 if (len > tx->local->rts_threshold
538 && tx->local->rts_threshold <
539 IEEE80211_MAX_RTS_THRESHOLD) {
540 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
541 info->flags |=
542 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
543 info->control.retry_limit =
544 tx->local->long_retry_limit;
545 } else {
546 info->control.retry_limit =
547 tx->local->short_retry_limit;
548 }
549 } else {
550 info->control.retry_limit = 1;
551 }
552 }
553
554 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
555 /* Do not use multiple retry rates when sending fragmented
556 * frames.
557 * TODO: The last fragment could still use multiple retry
558 * rates. */
559 info->control.alt_retry_rate_idx = -1;
560 }
561
562 /* Use CTS protection for unicast frames sent using extended rates if
563 * there are associated non-ERP stations and RTS/CTS is not configured
564 * for the frame. */
565 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
566 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
567 (tx->flags & IEEE80211_TX_UNICAST) &&
568 tx->sdata->bss_conf.use_cts_prot &&
569 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
570 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
571
572 /* Transmit data frames using short preambles if the driver supports
573 * short preambles at the selected rate and short preambles are
574 * available on the network at the current point in time. */
575 if (ieee80211_is_data(hdr->frame_control) &&
576 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
577 tx->sdata->bss_conf.use_short_preamble &&
578 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
579 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
580 }
581
582 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
583 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
584 struct ieee80211_rate *rate;
585 s8 baserate = -1;
586 int idx;
587
588 /* Do not use multiple retry rates when using RTS/CTS */
589 info->control.alt_retry_rate_idx = -1;
590
591 /* Use min(data rate, max base rate) as CTS/RTS rate */
592 rate = &sband->bitrates[tx->rate_idx];
593
594 for (idx = 0; idx < sband->n_bitrates; idx++) {
595 if (sband->bitrates[idx].bitrate > rate->bitrate)
596 continue;
597 if (tx->sdata->basic_rates & BIT(idx) &&
598 (baserate < 0 ||
599 (sband->bitrates[baserate].bitrate
600 < sband->bitrates[idx].bitrate)))
601 baserate = idx;
602 }
603
604 if (baserate >= 0)
605 info->control.rts_cts_rate_idx = baserate;
606 else
607 info->control.rts_cts_rate_idx = 0;
608 }
609
610 if (tx->sta)
611 info->control.aid = tx->sta->aid;
612
613 return TX_CONTINUE;
614 }
615
616 static ieee80211_tx_result debug_noinline
617 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
618 {
619 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
620 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
621 u16 *seq;
622 u8 *qc;
623 int tid;
624
625 /* only for injected frames */
626 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
627 return TX_CONTINUE;
628
629 if (ieee80211_hdrlen(hdr->frame_control) < 24)
630 return TX_CONTINUE;
631
632 if (!ieee80211_is_data_qos(hdr->frame_control)) {
633 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
634 return TX_CONTINUE;
635 }
636
637 /*
638 * This should be true for injected/management frames only, for
639 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
640 * above since they are not QoS-data frames.
641 */
642 if (!tx->sta)
643 return TX_CONTINUE;
644
645 /* include per-STA, per-TID sequence counter */
646
647 qc = ieee80211_get_qos_ctl(hdr);
648 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
649 seq = &tx->sta->tid_seq[tid];
650
651 hdr->seq_ctrl = cpu_to_le16(*seq);
652
653 /* Increase the sequence number. */
654 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
655
656 return TX_CONTINUE;
657 }
658
659 static ieee80211_tx_result debug_noinline
660 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
661 {
662 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
663 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
664 struct sk_buff **frags, *first, *frag;
665 int i;
666 u16 seq;
667 u8 *pos;
668 int frag_threshold = tx->local->fragmentation_threshold;
669
670 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
671 return TX_CONTINUE;
672
673 /*
674 * Warn when submitting a fragmented A-MPDU frame and drop it.
675 * This scenario is handled in __ieee80211_tx_prepare but extra
676 * caution taken here as fragmented ampdu may cause Tx stop.
677 */
678 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
679 skb_get_queue_mapping(tx->skb) >=
680 ieee80211_num_regular_queues(&tx->local->hw)))
681 return TX_DROP;
682
683 first = tx->skb;
684
685 hdrlen = ieee80211_hdrlen(hdr->frame_control);
686 payload_len = first->len - hdrlen;
687 per_fragm = frag_threshold - hdrlen - FCS_LEN;
688 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
689
690 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
691 if (!frags)
692 goto fail;
693
694 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
695 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
696 pos = first->data + hdrlen + per_fragm;
697 left = payload_len - per_fragm;
698 for (i = 0; i < num_fragm - 1; i++) {
699 struct ieee80211_hdr *fhdr;
700 size_t copylen;
701
702 if (left <= 0)
703 goto fail;
704
705 /* reserve enough extra head and tail room for possible
706 * encryption */
707 frag = frags[i] =
708 dev_alloc_skb(tx->local->tx_headroom +
709 frag_threshold +
710 IEEE80211_ENCRYPT_HEADROOM +
711 IEEE80211_ENCRYPT_TAILROOM);
712 if (!frag)
713 goto fail;
714 /* Make sure that all fragments use the same priority so
715 * that they end up using the same TX queue */
716 frag->priority = first->priority;
717 skb_reserve(frag, tx->local->tx_headroom +
718 IEEE80211_ENCRYPT_HEADROOM);
719 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
720 memcpy(fhdr, first->data, hdrlen);
721 if (i == num_fragm - 2)
722 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
723 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
724 copylen = left > per_fragm ? per_fragm : left;
725 memcpy(skb_put(frag, copylen), pos, copylen);
726 memcpy(frag->cb, first->cb, sizeof(frag->cb));
727 skb_copy_queue_mapping(frag, first);
728 frag->do_not_encrypt = first->do_not_encrypt;
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 if (frags) {
742 for (i = 0; i < num_fragm - 1; i++)
743 if (frags[i])
744 dev_kfree_skb(frags[i]);
745 kfree(frags);
746 }
747 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
748 return TX_DROP;
749 }
750
751 static ieee80211_tx_result debug_noinline
752 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
753 {
754 if (!tx->key)
755 return TX_CONTINUE;
756
757 switch (tx->key->conf.alg) {
758 case ALG_WEP:
759 return ieee80211_crypto_wep_encrypt(tx);
760 case ALG_TKIP:
761 return ieee80211_crypto_tkip_encrypt(tx);
762 case ALG_CCMP:
763 return ieee80211_crypto_ccmp_encrypt(tx);
764 }
765
766 /* not reached */
767 WARN_ON(1);
768 return TX_DROP;
769 }
770
771 static ieee80211_tx_result debug_noinline
772 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
773 {
774 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
775 int next_len, i;
776 int group_addr = is_multicast_ether_addr(hdr->addr1);
777
778 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
779 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
780 return TX_CONTINUE;
781 }
782
783 hdr->duration_id = ieee80211_duration(tx, group_addr,
784 tx->extra_frag[0]->len);
785
786 for (i = 0; i < tx->num_extra_frag; i++) {
787 if (i + 1 < tx->num_extra_frag) {
788 next_len = tx->extra_frag[i + 1]->len;
789 } else {
790 next_len = 0;
791 tx->rate_idx = tx->last_frag_rate_idx;
792 }
793
794 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
795 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
796 }
797
798 return TX_CONTINUE;
799 }
800
801 static ieee80211_tx_result debug_noinline
802 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
803 {
804 int i;
805
806 if (!tx->sta)
807 return TX_CONTINUE;
808
809 tx->sta->tx_packets++;
810 tx->sta->tx_fragments++;
811 tx->sta->tx_bytes += tx->skb->len;
812 if (tx->extra_frag) {
813 tx->sta->tx_fragments += tx->num_extra_frag;
814 for (i = 0; i < tx->num_extra_frag; i++)
815 tx->sta->tx_bytes += tx->extra_frag[i]->len;
816 }
817
818 return TX_CONTINUE;
819 }
820
821
822 /* actual transmit path */
823
824 /*
825 * deal with packet injection down monitor interface
826 * with Radiotap Header -- only called for monitor mode interface
827 */
828 static ieee80211_tx_result
829 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
830 struct sk_buff *skb)
831 {
832 /*
833 * this is the moment to interpret and discard the radiotap header that
834 * must be at the start of the packet injected in Monitor mode
835 *
836 * Need to take some care with endian-ness since radiotap
837 * args are little-endian
838 */
839
840 struct ieee80211_radiotap_iterator iterator;
841 struct ieee80211_radiotap_header *rthdr =
842 (struct ieee80211_radiotap_header *) skb->data;
843 struct ieee80211_supported_band *sband;
844 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
845 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
846
847 sband = tx->local->hw.wiphy->bands[tx->channel->band];
848
849 skb->do_not_encrypt = 1;
850 info->flags |= IEEE80211_TX_CTL_INJECTED;
851 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
852
853 /*
854 * for every radiotap entry that is present
855 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
856 * entries present, or -EINVAL on error)
857 */
858
859 while (!ret) {
860 int i, target_rate;
861
862 ret = ieee80211_radiotap_iterator_next(&iterator);
863
864 if (ret)
865 continue;
866
867 /* see if this argument is something we can use */
868 switch (iterator.this_arg_index) {
869 /*
870 * You must take care when dereferencing iterator.this_arg
871 * for multibyte types... the pointer is not aligned. Use
872 * get_unaligned((type *)iterator.this_arg) to dereference
873 * iterator.this_arg for type "type" safely on all arches.
874 */
875 case IEEE80211_RADIOTAP_RATE:
876 /*
877 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
878 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
879 */
880 target_rate = (*iterator.this_arg) * 5;
881 for (i = 0; i < sband->n_bitrates; i++) {
882 struct ieee80211_rate *r;
883
884 r = &sband->bitrates[i];
885
886 if (r->bitrate == target_rate) {
887 tx->rate_idx = i;
888 break;
889 }
890 }
891 break;
892
893 case IEEE80211_RADIOTAP_ANTENNA:
894 /*
895 * radiotap uses 0 for 1st ant, mac80211 is 1 for
896 * 1st ant
897 */
898 info->antenna_sel_tx = (*iterator.this_arg) + 1;
899 break;
900
901 #if 0
902 case IEEE80211_RADIOTAP_DBM_TX_POWER:
903 control->power_level = *iterator.this_arg;
904 break;
905 #endif
906
907 case IEEE80211_RADIOTAP_FLAGS:
908 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
909 /*
910 * this indicates that the skb we have been
911 * handed has the 32-bit FCS CRC at the end...
912 * we should react to that by snipping it off
913 * because it will be recomputed and added
914 * on transmission
915 */
916 if (skb->len < (iterator.max_length + FCS_LEN))
917 return TX_DROP;
918
919 skb_trim(skb, skb->len - FCS_LEN);
920 }
921 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
922 tx->skb->do_not_encrypt = 0;
923 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
924 tx->flags |= IEEE80211_TX_FRAGMENTED;
925 break;
926
927 /*
928 * Please update the file
929 * Documentation/networking/mac80211-injection.txt
930 * when parsing new fields here.
931 */
932
933 default:
934 break;
935 }
936 }
937
938 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
939 return TX_DROP;
940
941 /*
942 * remove the radiotap header
943 * iterator->max_length was sanity-checked against
944 * skb->len by iterator init
945 */
946 skb_pull(skb, iterator.max_length);
947
948 return TX_CONTINUE;
949 }
950
951 /*
952 * initialises @tx
953 */
954 static ieee80211_tx_result
955 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
956 struct sk_buff *skb,
957 struct net_device *dev)
958 {
959 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
960 struct ieee80211_hdr *hdr;
961 struct ieee80211_sub_if_data *sdata;
962 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
963
964 int hdrlen;
965
966 memset(tx, 0, sizeof(*tx));
967 tx->skb = skb;
968 tx->dev = dev; /* use original interface */
969 tx->local = local;
970 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
971 tx->channel = local->hw.conf.channel;
972 tx->rate_idx = -1;
973 tx->last_frag_rate_idx = -1;
974 /*
975 * Set this flag (used below to indicate "automatic fragmentation"),
976 * it will be cleared/left by radiotap as desired.
977 */
978 tx->flags |= IEEE80211_TX_FRAGMENTED;
979
980 /* process and remove the injection radiotap header */
981 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
982 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
983 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
984 return TX_DROP;
985
986 /*
987 * __ieee80211_parse_tx_radiotap has now removed
988 * the radiotap header that was present and pre-filled
989 * 'tx' with tx control information.
990 */
991 }
992
993 hdr = (struct ieee80211_hdr *) skb->data;
994
995 tx->sta = sta_info_get(local, hdr->addr1);
996
997 if (is_multicast_ether_addr(hdr->addr1)) {
998 tx->flags &= ~IEEE80211_TX_UNICAST;
999 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1000 } else {
1001 tx->flags |= IEEE80211_TX_UNICAST;
1002 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1003 }
1004
1005 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1006 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1007 skb->len + FCS_LEN > local->fragmentation_threshold &&
1008 !local->ops->set_frag_threshold &&
1009 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1010 tx->flags |= IEEE80211_TX_FRAGMENTED;
1011 else
1012 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1013 }
1014
1015 if (!tx->sta)
1016 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1017 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1018 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1019
1020 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1021 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1022 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1023 tx->ethertype = (pos[0] << 8) | pos[1];
1024 }
1025 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1026
1027 return TX_CONTINUE;
1028 }
1029
1030 /*
1031 * NB: @tx is uninitialised when passed in here
1032 */
1033 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1034 struct sk_buff *skb,
1035 struct net_device *mdev)
1036 {
1037 struct net_device *dev;
1038
1039 dev = dev_get_by_index(&init_net, skb->iif);
1040 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1041 dev_put(dev);
1042 dev = NULL;
1043 }
1044 if (unlikely(!dev))
1045 return -ENODEV;
1046 /* initialises tx with control */
1047 __ieee80211_tx_prepare(tx, skb, dev);
1048 dev_put(dev);
1049 return 0;
1050 }
1051
1052 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1053 struct ieee80211_tx_data *tx)
1054 {
1055 struct ieee80211_tx_info *info;
1056 int ret, i;
1057
1058 if (skb) {
1059 if (netif_subqueue_stopped(local->mdev, skb))
1060 return IEEE80211_TX_AGAIN;
1061 info = IEEE80211_SKB_CB(skb);
1062
1063 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1064 "TX to low-level driver", skb);
1065 ret = local->ops->tx(local_to_hw(local), skb);
1066 if (ret)
1067 return IEEE80211_TX_AGAIN;
1068 local->mdev->trans_start = jiffies;
1069 ieee80211_led_tx(local, 1);
1070 }
1071 if (tx->extra_frag) {
1072 for (i = 0; i < tx->num_extra_frag; i++) {
1073 if (!tx->extra_frag[i])
1074 continue;
1075 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1076 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1077 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1078 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1079 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1080 if (netif_subqueue_stopped(local->mdev,
1081 tx->extra_frag[i]))
1082 return IEEE80211_TX_FRAG_AGAIN;
1083 if (i == tx->num_extra_frag) {
1084 info->tx_rate_idx = tx->last_frag_rate_idx;
1085
1086 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1087 info->flags |=
1088 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1089 else
1090 info->flags &=
1091 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1092 }
1093
1094 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1095 "TX to low-level driver",
1096 tx->extra_frag[i]);
1097 ret = local->ops->tx(local_to_hw(local),
1098 tx->extra_frag[i]);
1099 if (ret)
1100 return IEEE80211_TX_FRAG_AGAIN;
1101 local->mdev->trans_start = jiffies;
1102 ieee80211_led_tx(local, 1);
1103 tx->extra_frag[i] = NULL;
1104 }
1105 kfree(tx->extra_frag);
1106 tx->extra_frag = NULL;
1107 }
1108 return IEEE80211_TX_OK;
1109 }
1110
1111 /*
1112 * Invoke TX handlers, return 0 on success and non-zero if the
1113 * frame was dropped or queued.
1114 */
1115 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1116 {
1117 struct sk_buff *skb = tx->skb;
1118 ieee80211_tx_result res = TX_DROP;
1119 int i;
1120
1121 #define CALL_TXH(txh) \
1122 res = txh(tx); \
1123 if (res != TX_CONTINUE) \
1124 goto txh_done;
1125
1126 CALL_TXH(ieee80211_tx_h_check_assoc)
1127 CALL_TXH(ieee80211_tx_h_ps_buf)
1128 CALL_TXH(ieee80211_tx_h_select_key)
1129 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1130 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1131 CALL_TXH(ieee80211_tx_h_misc)
1132 CALL_TXH(ieee80211_tx_h_sequence)
1133 CALL_TXH(ieee80211_tx_h_fragment)
1134 /* handlers after fragment must be aware of tx info fragmentation! */
1135 CALL_TXH(ieee80211_tx_h_encrypt)
1136 CALL_TXH(ieee80211_tx_h_calculate_duration)
1137 CALL_TXH(ieee80211_tx_h_stats)
1138 #undef CALL_TXH
1139
1140 txh_done:
1141 if (unlikely(res == TX_DROP)) {
1142 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1143 dev_kfree_skb(skb);
1144 for (i = 0; i < tx->num_extra_frag; i++)
1145 if (tx->extra_frag[i])
1146 dev_kfree_skb(tx->extra_frag[i]);
1147 kfree(tx->extra_frag);
1148 return -1;
1149 } else if (unlikely(res == TX_QUEUED)) {
1150 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1151 return -1;
1152 }
1153
1154 return 0;
1155 }
1156
1157 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1158 {
1159 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1160 struct sta_info *sta;
1161 struct ieee80211_tx_data tx;
1162 ieee80211_tx_result res_prepare;
1163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1164 int ret, i;
1165 u16 queue;
1166
1167 queue = skb_get_queue_mapping(skb);
1168
1169 WARN_ON(test_bit(queue, local->queues_pending));
1170
1171 if (unlikely(skb->len < 10)) {
1172 dev_kfree_skb(skb);
1173 return 0;
1174 }
1175
1176 rcu_read_lock();
1177
1178 /* initialises tx */
1179 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1180
1181 if (res_prepare == TX_DROP) {
1182 dev_kfree_skb(skb);
1183 rcu_read_unlock();
1184 return 0;
1185 }
1186
1187 sta = tx.sta;
1188 tx.channel = local->hw.conf.channel;
1189 info->band = tx.channel->band;
1190
1191 if (invoke_tx_handlers(&tx))
1192 goto out;
1193
1194 retry:
1195 ret = __ieee80211_tx(local, skb, &tx);
1196 if (ret) {
1197 struct ieee80211_tx_stored_packet *store;
1198
1199 /*
1200 * Since there are no fragmented frames on A-MPDU
1201 * queues, there's no reason for a driver to reject
1202 * a frame there, warn and drop it.
1203 */
1204 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1205 goto drop;
1206
1207 store = &local->pending_packet[queue];
1208
1209 if (ret == IEEE80211_TX_FRAG_AGAIN)
1210 skb = NULL;
1211
1212 set_bit(queue, local->queues_pending);
1213 smp_mb();
1214 /*
1215 * When the driver gets out of buffers during sending of
1216 * fragments and calls ieee80211_stop_queue, the netif
1217 * subqueue is stopped. There is, however, a small window
1218 * in which the PENDING bit is not yet set. If a buffer
1219 * gets available in that window (i.e. driver calls
1220 * ieee80211_wake_queue), we would end up with ieee80211_tx
1221 * called with the PENDING bit still set. Prevent this by
1222 * continuing transmitting here when that situation is
1223 * possible to have happened.
1224 */
1225 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1226 clear_bit(queue, local->queues_pending);
1227 goto retry;
1228 }
1229 store->skb = skb;
1230 store->extra_frag = tx.extra_frag;
1231 store->num_extra_frag = tx.num_extra_frag;
1232 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1233 store->last_frag_rate_ctrl_probe =
1234 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1235 }
1236 out:
1237 rcu_read_unlock();
1238 return 0;
1239
1240 drop:
1241 if (skb)
1242 dev_kfree_skb(skb);
1243 for (i = 0; i < tx.num_extra_frag; i++)
1244 if (tx.extra_frag[i])
1245 dev_kfree_skb(tx.extra_frag[i]);
1246 kfree(tx.extra_frag);
1247 rcu_read_unlock();
1248 return 0;
1249 }
1250
1251 /* device xmit handlers */
1252
1253 static int ieee80211_skb_resize(struct ieee80211_local *local,
1254 struct sk_buff *skb,
1255 int head_need, bool may_encrypt)
1256 {
1257 int tail_need = 0;
1258
1259 /*
1260 * This could be optimised, devices that do full hardware
1261 * crypto (including TKIP MMIC) need no tailroom... But we
1262 * have no drivers for such devices currently.
1263 */
1264 if (may_encrypt) {
1265 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1266 tail_need -= skb_tailroom(skb);
1267 tail_need = max_t(int, tail_need, 0);
1268 }
1269
1270 if (head_need || tail_need) {
1271 /* Sorry. Can't account for this any more */
1272 skb_orphan(skb);
1273 }
1274
1275 if (skb_header_cloned(skb))
1276 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1277 else
1278 I802_DEBUG_INC(local->tx_expand_skb_head);
1279
1280 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1281 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1282 wiphy_name(local->hw.wiphy));
1283 return -ENOMEM;
1284 }
1285
1286 /* update truesize too */
1287 skb->truesize += head_need + tail_need;
1288
1289 return 0;
1290 }
1291
1292 int ieee80211_master_start_xmit(struct sk_buff *skb,
1293 struct net_device *dev)
1294 {
1295 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1296 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1297 struct net_device *odev = NULL;
1298 struct ieee80211_sub_if_data *osdata;
1299 int headroom;
1300 bool may_encrypt;
1301 int ret;
1302
1303 if (skb->iif)
1304 odev = dev_get_by_index(&init_net, skb->iif);
1305 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1306 dev_put(odev);
1307 odev = NULL;
1308 }
1309 if (unlikely(!odev)) {
1310 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1311 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1312 "originating device\n", dev->name);
1313 #endif
1314 dev_kfree_skb(skb);
1315 return 0;
1316 }
1317
1318 memset(info, 0, sizeof(*info));
1319
1320 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1321
1322 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1323
1324 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1325 ieee80211_is_data(hdr->frame_control)) {
1326 if (ieee80211_is_data(hdr->frame_control)) {
1327 if (is_multicast_ether_addr(hdr->addr3))
1328 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1329 else
1330 if (mesh_nexthop_lookup(skb, osdata))
1331 return 0;
1332 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1333 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1334 fwded_frames);
1335 }
1336 }
1337
1338 may_encrypt = !skb->do_not_encrypt;
1339
1340 headroom = osdata->local->tx_headroom;
1341 if (may_encrypt)
1342 headroom += IEEE80211_ENCRYPT_HEADROOM;
1343 headroom -= skb_headroom(skb);
1344 headroom = max_t(int, 0, headroom);
1345
1346 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1347 dev_kfree_skb(skb);
1348 dev_put(odev);
1349 return 0;
1350 }
1351
1352 info->control.vif = &osdata->vif;
1353 ret = ieee80211_tx(odev, skb);
1354 dev_put(odev);
1355
1356 return ret;
1357 }
1358
1359 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1360 struct net_device *dev)
1361 {
1362 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1363 struct ieee80211_radiotap_header *prthdr =
1364 (struct ieee80211_radiotap_header *)skb->data;
1365 u16 len_rthdr;
1366
1367 /* check for not even having the fixed radiotap header part */
1368 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1369 goto fail; /* too short to be possibly valid */
1370
1371 /* is it a header version we can trust to find length from? */
1372 if (unlikely(prthdr->it_version))
1373 goto fail; /* only version 0 is supported */
1374
1375 /* then there must be a radiotap header with a length we can use */
1376 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1377
1378 /* does the skb contain enough to deliver on the alleged length? */
1379 if (unlikely(skb->len < len_rthdr))
1380 goto fail; /* skb too short for claimed rt header extent */
1381
1382 skb->dev = local->mdev;
1383
1384 /* needed because we set skb device to master */
1385 skb->iif = dev->ifindex;
1386
1387 /* sometimes we do encrypt injected frames, will be fixed
1388 * up in radiotap parser if not wanted */
1389 skb->do_not_encrypt = 0;
1390
1391 /*
1392 * fix up the pointers accounting for the radiotap
1393 * header still being in there. We are being given
1394 * a precooked IEEE80211 header so no need for
1395 * normal processing
1396 */
1397 skb_set_mac_header(skb, len_rthdr);
1398 /*
1399 * these are just fixed to the end of the rt area since we
1400 * don't have any better information and at this point, nobody cares
1401 */
1402 skb_set_network_header(skb, len_rthdr);
1403 skb_set_transport_header(skb, len_rthdr);
1404
1405 /* pass the radiotap header up to the next stage intact */
1406 dev_queue_xmit(skb);
1407 return NETDEV_TX_OK;
1408
1409 fail:
1410 dev_kfree_skb(skb);
1411 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1412 }
1413
1414 /**
1415 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1416 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1417 * @skb: packet to be sent
1418 * @dev: incoming interface
1419 *
1420 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1421 * not be freed, and caller is responsible for either retrying later or freeing
1422 * skb).
1423 *
1424 * This function takes in an Ethernet header and encapsulates it with suitable
1425 * IEEE 802.11 header based on which interface the packet is coming in. The
1426 * encapsulated packet will then be passed to master interface, wlan#.11, for
1427 * transmission (through low-level driver).
1428 */
1429 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1430 struct net_device *dev)
1431 {
1432 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1433 struct ieee80211_sub_if_data *sdata;
1434 int ret = 1, head_need;
1435 u16 ethertype, hdrlen, meshhdrlen = 0;
1436 __le16 fc;
1437 struct ieee80211_hdr hdr;
1438 struct ieee80211s_hdr mesh_hdr;
1439 const u8 *encaps_data;
1440 int encaps_len, skip_header_bytes;
1441 int nh_pos, h_pos;
1442 struct sta_info *sta;
1443 u32 sta_flags = 0;
1444
1445 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1446 if (unlikely(skb->len < ETH_HLEN)) {
1447 ret = 0;
1448 goto fail;
1449 }
1450
1451 nh_pos = skb_network_header(skb) - skb->data;
1452 h_pos = skb_transport_header(skb) - skb->data;
1453
1454 /* convert Ethernet header to proper 802.11 header (based on
1455 * operation mode) */
1456 ethertype = (skb->data[12] << 8) | skb->data[13];
1457 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1458
1459 switch (sdata->vif.type) {
1460 case IEEE80211_IF_TYPE_AP:
1461 case IEEE80211_IF_TYPE_VLAN:
1462 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1463 /* DA BSSID SA */
1464 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1465 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1466 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1467 hdrlen = 24;
1468 break;
1469 case IEEE80211_IF_TYPE_WDS:
1470 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1471 /* RA TA DA SA */
1472 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1473 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1474 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1475 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1476 hdrlen = 30;
1477 break;
1478 #ifdef CONFIG_MAC80211_MESH
1479 case IEEE80211_IF_TYPE_MESH_POINT:
1480 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1481 /* RA TA DA SA */
1482 memset(hdr.addr1, 0, ETH_ALEN);
1483 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1484 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1485 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1486 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1487 /* Do not send frames with mesh_ttl == 0 */
1488 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1489 ret = 0;
1490 goto fail;
1491 }
1492 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1493 hdrlen = 30;
1494 break;
1495 #endif
1496 case IEEE80211_IF_TYPE_STA:
1497 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1498 /* BSSID SA DA */
1499 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1500 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1501 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1502 hdrlen = 24;
1503 break;
1504 case IEEE80211_IF_TYPE_IBSS:
1505 /* DA SA BSSID */
1506 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1507 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1508 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1509 hdrlen = 24;
1510 break;
1511 default:
1512 ret = 0;
1513 goto fail;
1514 }
1515
1516 /*
1517 * There's no need to try to look up the destination
1518 * if it is a multicast address (which can only happen
1519 * in AP mode)
1520 */
1521 if (!is_multicast_ether_addr(hdr.addr1)) {
1522 rcu_read_lock();
1523 sta = sta_info_get(local, hdr.addr1);
1524 if (sta)
1525 sta_flags = get_sta_flags(sta);
1526 rcu_read_unlock();
1527 }
1528
1529 /* receiver and we are QoS enabled, use a QoS type frame */
1530 if (sta_flags & WLAN_STA_WME &&
1531 ieee80211_num_regular_queues(&local->hw) >= 4) {
1532 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1533 hdrlen += 2;
1534 }
1535
1536 /*
1537 * Drop unicast frames to unauthorised stations unless they are
1538 * EAPOL frames from the local station.
1539 */
1540 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1541 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1542 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1543 !(ethertype == ETH_P_PAE &&
1544 compare_ether_addr(dev->dev_addr,
1545 skb->data + ETH_ALEN) == 0))) {
1546 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1547 DECLARE_MAC_BUF(mac);
1548
1549 if (net_ratelimit())
1550 printk(KERN_DEBUG "%s: dropped frame to %s"
1551 " (unauthorized port)\n", dev->name,
1552 print_mac(mac, hdr.addr1));
1553 #endif
1554
1555 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1556
1557 ret = 0;
1558 goto fail;
1559 }
1560
1561 hdr.frame_control = fc;
1562 hdr.duration_id = 0;
1563 hdr.seq_ctrl = 0;
1564
1565 skip_header_bytes = ETH_HLEN;
1566 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1567 encaps_data = bridge_tunnel_header;
1568 encaps_len = sizeof(bridge_tunnel_header);
1569 skip_header_bytes -= 2;
1570 } else if (ethertype >= 0x600) {
1571 encaps_data = rfc1042_header;
1572 encaps_len = sizeof(rfc1042_header);
1573 skip_header_bytes -= 2;
1574 } else {
1575 encaps_data = NULL;
1576 encaps_len = 0;
1577 }
1578
1579 skb_pull(skb, skip_header_bytes);
1580 nh_pos -= skip_header_bytes;
1581 h_pos -= skip_header_bytes;
1582
1583 /* TODO: implement support for fragments so that there is no need to
1584 * reallocate and copy payload; it might be enough to support one
1585 * extra fragment that would be copied in the beginning of the frame
1586 * data.. anyway, it would be nice to include this into skb structure
1587 * somehow
1588 *
1589 * There are few options for this:
1590 * use skb->cb as an extra space for 802.11 header
1591 * allocate new buffer if not enough headroom
1592 * make sure that there is enough headroom in every skb by increasing
1593 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1594 * alloc_skb() (net/core/skbuff.c)
1595 */
1596 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1597
1598 /*
1599 * So we need to modify the skb header and hence need a copy of
1600 * that. The head_need variable above doesn't, so far, include
1601 * the needed header space that we don't need right away. If we
1602 * can, then we don't reallocate right now but only after the
1603 * frame arrives at the master device (if it does...)
1604 *
1605 * If we cannot, however, then we will reallocate to include all
1606 * the ever needed space. Also, if we need to reallocate it anyway,
1607 * make it big enough for everything we may ever need.
1608 */
1609
1610 if (head_need > 0 || skb_cloned(skb)) {
1611 head_need += IEEE80211_ENCRYPT_HEADROOM;
1612 head_need += local->tx_headroom;
1613 head_need = max_t(int, 0, head_need);
1614 if (ieee80211_skb_resize(local, skb, head_need, true))
1615 goto fail;
1616 }
1617
1618 if (encaps_data) {
1619 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1620 nh_pos += encaps_len;
1621 h_pos += encaps_len;
1622 }
1623
1624 if (meshhdrlen > 0) {
1625 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1626 nh_pos += meshhdrlen;
1627 h_pos += meshhdrlen;
1628 }
1629
1630 if (ieee80211_is_data_qos(fc)) {
1631 __le16 *qos_control;
1632
1633 qos_control = (__le16*) skb_push(skb, 2);
1634 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1635 /*
1636 * Maybe we could actually set some fields here, for now just
1637 * initialise to zero to indicate no special operation.
1638 */
1639 *qos_control = 0;
1640 } else
1641 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1642
1643 nh_pos += hdrlen;
1644 h_pos += hdrlen;
1645
1646 skb->iif = dev->ifindex;
1647
1648 skb->dev = local->mdev;
1649 dev->stats.tx_packets++;
1650 dev->stats.tx_bytes += skb->len;
1651
1652 /* Update skb pointers to various headers since this modified frame
1653 * is going to go through Linux networking code that may potentially
1654 * need things like pointer to IP header. */
1655 skb_set_mac_header(skb, 0);
1656 skb_set_network_header(skb, nh_pos);
1657 skb_set_transport_header(skb, h_pos);
1658
1659 dev->trans_start = jiffies;
1660 dev_queue_xmit(skb);
1661
1662 return 0;
1663
1664 fail:
1665 if (!ret)
1666 dev_kfree_skb(skb);
1667
1668 return ret;
1669 }
1670
1671
1672 /*
1673 * ieee80211_clear_tx_pending may not be called in a context where
1674 * it is possible that it packets could come in again.
1675 */
1676 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1677 {
1678 int i, j;
1679 struct ieee80211_tx_stored_packet *store;
1680
1681 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1682 if (!test_bit(i, local->queues_pending))
1683 continue;
1684 store = &local->pending_packet[i];
1685 kfree_skb(store->skb);
1686 for (j = 0; j < store->num_extra_frag; j++)
1687 kfree_skb(store->extra_frag[j]);
1688 kfree(store->extra_frag);
1689 clear_bit(i, local->queues_pending);
1690 }
1691 }
1692
1693 /*
1694 * Transmit all pending packets. Called from tasklet, locks master device
1695 * TX lock so that no new packets can come in.
1696 */
1697 void ieee80211_tx_pending(unsigned long data)
1698 {
1699 struct ieee80211_local *local = (struct ieee80211_local *)data;
1700 struct net_device *dev = local->mdev;
1701 struct ieee80211_tx_stored_packet *store;
1702 struct ieee80211_tx_data tx;
1703 int i, ret;
1704
1705 netif_tx_lock_bh(dev);
1706 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1707 /* Check that this queue is ok */
1708 if (__netif_subqueue_stopped(local->mdev, i) &&
1709 !test_bit(i, local->queues_pending_run))
1710 continue;
1711
1712 if (!test_bit(i, local->queues_pending)) {
1713 clear_bit(i, local->queues_pending_run);
1714 ieee80211_wake_queue(&local->hw, i);
1715 continue;
1716 }
1717
1718 clear_bit(i, local->queues_pending_run);
1719 netif_start_subqueue(local->mdev, i);
1720
1721 store = &local->pending_packet[i];
1722 tx.extra_frag = store->extra_frag;
1723 tx.num_extra_frag = store->num_extra_frag;
1724 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1725 tx.flags = 0;
1726 if (store->last_frag_rate_ctrl_probe)
1727 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1728 ret = __ieee80211_tx(local, store->skb, &tx);
1729 if (ret) {
1730 if (ret == IEEE80211_TX_FRAG_AGAIN)
1731 store->skb = NULL;
1732 } else {
1733 clear_bit(i, local->queues_pending);
1734 ieee80211_wake_queue(&local->hw, i);
1735 }
1736 }
1737 netif_tx_unlock_bh(dev);
1738 }
1739
1740 /* functions for drivers to get certain frames */
1741
1742 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1743 struct ieee80211_if_ap *bss,
1744 struct sk_buff *skb,
1745 struct beacon_data *beacon)
1746 {
1747 u8 *pos, *tim;
1748 int aid0 = 0;
1749 int i, have_bits = 0, n1, n2;
1750
1751 /* Generate bitmap for TIM only if there are any STAs in power save
1752 * mode. */
1753 if (atomic_read(&bss->num_sta_ps) > 0)
1754 /* in the hope that this is faster than
1755 * checking byte-for-byte */
1756 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1757 IEEE80211_MAX_AID+1);
1758
1759 if (bss->dtim_count == 0)
1760 bss->dtim_count = beacon->dtim_period - 1;
1761 else
1762 bss->dtim_count--;
1763
1764 tim = pos = (u8 *) skb_put(skb, 6);
1765 *pos++ = WLAN_EID_TIM;
1766 *pos++ = 4;
1767 *pos++ = bss->dtim_count;
1768 *pos++ = beacon->dtim_period;
1769
1770 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1771 aid0 = 1;
1772
1773 if (have_bits) {
1774 /* Find largest even number N1 so that bits numbered 1 through
1775 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1776 * (N2 + 1) x 8 through 2007 are 0. */
1777 n1 = 0;
1778 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1779 if (bss->tim[i]) {
1780 n1 = i & 0xfe;
1781 break;
1782 }
1783 }
1784 n2 = n1;
1785 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1786 if (bss->tim[i]) {
1787 n2 = i;
1788 break;
1789 }
1790 }
1791
1792 /* Bitmap control */
1793 *pos++ = n1 | aid0;
1794 /* Part Virt Bitmap */
1795 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1796
1797 tim[1] = n2 - n1 + 4;
1798 skb_put(skb, n2 - n1);
1799 } else {
1800 *pos++ = aid0; /* Bitmap control */
1801 *pos++ = 0; /* Part Virt Bitmap */
1802 }
1803 }
1804
1805 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1806 struct ieee80211_vif *vif)
1807 {
1808 struct ieee80211_local *local = hw_to_local(hw);
1809 struct sk_buff *skb = NULL;
1810 struct ieee80211_tx_info *info;
1811 struct net_device *bdev;
1812 struct ieee80211_sub_if_data *sdata = NULL;
1813 struct ieee80211_if_ap *ap = NULL;
1814 struct ieee80211_if_sta *ifsta = NULL;
1815 struct rate_selection rsel;
1816 struct beacon_data *beacon;
1817 struct ieee80211_supported_band *sband;
1818 int *num_beacons;
1819 enum ieee80211_band band = local->hw.conf.channel->band;
1820
1821 sband = local->hw.wiphy->bands[band];
1822
1823 rcu_read_lock();
1824
1825 sdata = vif_to_sdata(vif);
1826 bdev = sdata->dev;
1827
1828 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1829 ap = &sdata->u.ap;
1830 beacon = rcu_dereference(ap->beacon);
1831 if (ap && beacon) {
1832 /*
1833 * headroom, head length,
1834 * tail length and maximum TIM length
1835 */
1836 skb = dev_alloc_skb(local->tx_headroom +
1837 beacon->head_len +
1838 beacon->tail_len + 256);
1839 if (!skb)
1840 goto out;
1841
1842 skb_reserve(skb, local->tx_headroom);
1843 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1844 beacon->head_len);
1845
1846 /*
1847 * Not very nice, but we want to allow the driver to call
1848 * ieee80211_beacon_get() as a response to the set_tim()
1849 * callback. That, however, is already invoked under the
1850 * sta_lock to guarantee consistent and race-free update
1851 * of the tim bitmap in mac80211 and the driver.
1852 */
1853 if (local->tim_in_locked_section) {
1854 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1855 } else {
1856 unsigned long flags;
1857
1858 spin_lock_irqsave(&local->sta_lock, flags);
1859 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1860 spin_unlock_irqrestore(&local->sta_lock, flags);
1861 }
1862
1863 if (beacon->tail)
1864 memcpy(skb_put(skb, beacon->tail_len),
1865 beacon->tail, beacon->tail_len);
1866
1867 num_beacons = &ap->num_beacons;
1868 } else
1869 goto out;
1870 } else if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1871 struct ieee80211_hdr *hdr;
1872 ifsta = &sdata->u.sta;
1873
1874 if (!ifsta->probe_resp)
1875 goto out;
1876
1877 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1878 if (!skb)
1879 goto out;
1880
1881 hdr = (struct ieee80211_hdr *) skb->data;
1882 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1883 IEEE80211_STYPE_BEACON);
1884
1885 num_beacons = &ifsta->num_beacons;
1886 #ifdef CONFIG_MAC80211_MESH
1887 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1888 struct ieee80211_mgmt *mgmt;
1889 u8 *pos;
1890
1891 /* headroom, head length, tail length and maximum TIM length */
1892 skb = dev_alloc_skb(local->tx_headroom + 400);
1893 if (!skb)
1894 goto out;
1895
1896 skb_reserve(skb, local->hw.extra_tx_headroom);
1897 mgmt = (struct ieee80211_mgmt *)
1898 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1899 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1900 mgmt->frame_control =
1901 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1902 memset(mgmt->da, 0xff, ETH_ALEN);
1903 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1904 /* BSSID is left zeroed, wildcard value */
1905 mgmt->u.beacon.beacon_int =
1906 cpu_to_le16(local->hw.conf.beacon_int);
1907 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1908
1909 pos = skb_put(skb, 2);
1910 *pos++ = WLAN_EID_SSID;
1911 *pos++ = 0x0;
1912
1913 mesh_mgmt_ies_add(skb, sdata);
1914
1915 num_beacons = &sdata->u.mesh.num_beacons;
1916 #endif
1917 } else {
1918 WARN_ON(1);
1919 goto out;
1920 }
1921
1922 info = IEEE80211_SKB_CB(skb);
1923
1924 skb->do_not_encrypt = 1;
1925
1926 info->band = band;
1927 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1928
1929 if (unlikely(rsel.rate_idx < 0)) {
1930 if (net_ratelimit()) {
1931 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1932 "no rate found\n",
1933 wiphy_name(local->hw.wiphy));
1934 }
1935 dev_kfree_skb_any(skb);
1936 skb = NULL;
1937 goto out;
1938 }
1939
1940 info->control.vif = vif;
1941 info->tx_rate_idx = rsel.rate_idx;
1942
1943 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1944 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1945 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
1946 if (sdata->bss_conf.use_short_preamble &&
1947 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1948 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1949
1950 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1951 info->control.retry_limit = 1;
1952
1953 (*num_beacons)++;
1954 out:
1955 rcu_read_unlock();
1956 return skb;
1957 }
1958 EXPORT_SYMBOL(ieee80211_beacon_get);
1959
1960 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1961 const void *frame, size_t frame_len,
1962 const struct ieee80211_tx_info *frame_txctl,
1963 struct ieee80211_rts *rts)
1964 {
1965 const struct ieee80211_hdr *hdr = frame;
1966
1967 rts->frame_control =
1968 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
1969 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1970 frame_txctl);
1971 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1972 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1973 }
1974 EXPORT_SYMBOL(ieee80211_rts_get);
1975
1976 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1977 const void *frame, size_t frame_len,
1978 const struct ieee80211_tx_info *frame_txctl,
1979 struct ieee80211_cts *cts)
1980 {
1981 const struct ieee80211_hdr *hdr = frame;
1982
1983 cts->frame_control =
1984 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
1985 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1986 frame_len, frame_txctl);
1987 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1988 }
1989 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1990
1991 struct sk_buff *
1992 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1993 struct ieee80211_vif *vif)
1994 {
1995 struct ieee80211_local *local = hw_to_local(hw);
1996 struct sk_buff *skb = NULL;
1997 struct sta_info *sta;
1998 struct ieee80211_tx_data tx;
1999 struct net_device *bdev;
2000 struct ieee80211_sub_if_data *sdata;
2001 struct ieee80211_if_ap *bss = NULL;
2002 struct beacon_data *beacon;
2003 struct ieee80211_tx_info *info;
2004
2005 sdata = vif_to_sdata(vif);
2006 bdev = sdata->dev;
2007 bss = &sdata->u.ap;
2008
2009 if (!bss)
2010 return NULL;
2011
2012 rcu_read_lock();
2013 beacon = rcu_dereference(bss->beacon);
2014
2015 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || !beacon->head)
2016 goto out;
2017
2018 if (bss->dtim_count != 0)
2019 goto out; /* send buffered bc/mc only after DTIM beacon */
2020
2021 while (1) {
2022 skb = skb_dequeue(&bss->ps_bc_buf);
2023 if (!skb)
2024 goto out;
2025 local->total_ps_buffered--;
2026
2027 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2028 struct ieee80211_hdr *hdr =
2029 (struct ieee80211_hdr *) skb->data;
2030 /* more buffered multicast/broadcast frames ==> set
2031 * MoreData flag in IEEE 802.11 header to inform PS
2032 * STAs */
2033 hdr->frame_control |=
2034 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2035 }
2036
2037 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2038 break;
2039 dev_kfree_skb_any(skb);
2040 }
2041
2042 info = IEEE80211_SKB_CB(skb);
2043
2044 sta = tx.sta;
2045 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2046 tx.channel = local->hw.conf.channel;
2047 info->band = tx.channel->band;
2048
2049 if (invoke_tx_handlers(&tx))
2050 skb = NULL;
2051 out:
2052 rcu_read_unlock();
2053
2054 return skb;
2055 }
2056 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
AMDTP streaming driver for the Linux FireWire stack (Juju)