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[linux-2.6/mini2440.git] / net / mac80211 / tx.c
blob0fbadd8b983c821df9de353217e998058565718f
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
86 sband = local->hw.wiphy->bands[tx->channel->band];
87 txrate = &sband->bitrates[tx->rate_idx];
88
89 erp = 0;
90 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
91 erp = txrate->flags & IEEE80211_RATE_ERP_G;
92
93 /*
94 * data and mgmt (except PS Poll):
95 * - during CFP: 32768
96 * - during contention period:
97 * if addr1 is group address: 0
98 * if more fragments = 0 and addr1 is individual address: time to
99 * transmit one ACK plus SIFS
100 * if more fragments = 1 and addr1 is individual address: time to
101 * transmit next fragment plus 2 x ACK plus 3 x SIFS
102 *
103 * IEEE 802.11, 9.6:
104 * - control response frame (CTS or ACK) shall be transmitted using the
105 * same rate as the immediately previous frame in the frame exchange
106 * sequence, if this rate belongs to the PHY mandatory rates, or else
107 * at the highest possible rate belonging to the PHY rates in the
108 * BSSBasicRateSet
109 */
110
111 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
112 /* TODO: These control frames are not currently sent by
113 * 80211.o, but should they be implemented, this function
114 * needs to be updated to support duration field calculation.
115 *
116 * RTS: time needed to transmit pending data/mgmt frame plus
117 * one CTS frame plus one ACK frame plus 3 x SIFS
118 * CTS: duration of immediately previous RTS minus time
119 * required to transmit CTS and its SIFS
120 * ACK: 0 if immediately previous directed data/mgmt had
121 * more=0, with more=1 duration in ACK frame is duration
122 * from previous frame minus time needed to transmit ACK
123 * and its SIFS
124 * PS Poll: BIT(15) | BIT(14) | aid
125 */
126 return 0;
127 }
128
129 /* data/mgmt */
130 if (0 /* FIX: data/mgmt during CFP */)
131 return cpu_to_le16(32768);
132
133 if (group_addr) /* Group address as the destination - no ACK */
134 return 0;
135
136 /* Individual destination address:
137 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
138 * CTS and ACK frames shall be transmitted using the highest rate in
139 * basic rate set that is less than or equal to the rate of the
140 * immediately previous frame and that is using the same modulation
141 * (CCK or OFDM). If no basic rate set matches with these requirements,
142 * the highest mandatory rate of the PHY that is less than or equal to
143 * the rate of the previous frame is used.
144 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
145 */
146 rate = -1;
147 /* use lowest available if everything fails */
148 mrate = sband->bitrates[0].bitrate;
149 for (i = 0; i < sband->n_bitrates; i++) {
150 struct ieee80211_rate *r = &sband->bitrates[i];
151
152 if (r->bitrate > txrate->bitrate)
153 break;
154
155 if (tx->sdata->basic_rates & BIT(i))
156 rate = r->bitrate;
157
158 switch (sband->band) {
159 case IEEE80211_BAND_2GHZ: {
160 u32 flag;
161 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
162 flag = IEEE80211_RATE_MANDATORY_G;
163 else
164 flag = IEEE80211_RATE_MANDATORY_B;
165 if (r->flags & flag)
166 mrate = r->bitrate;
167 break;
168 }
169 case IEEE80211_BAND_5GHZ:
170 if (r->flags & IEEE80211_RATE_MANDATORY_A)
171 mrate = r->bitrate;
172 break;
173 case IEEE80211_NUM_BANDS:
174 WARN_ON(1);
175 break;
176 }
177 }
178 if (rate == -1) {
179 /* No matching basic rate found; use highest suitable mandatory
180 * PHY rate */
181 rate = mrate;
182 }
183
184 /* Time needed to transmit ACK
185 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
186 * to closest integer */
187
188 dur = ieee80211_frame_duration(local, 10, rate, erp,
189 tx->sdata->bss_conf.use_short_preamble);
190
191 if (next_frag_len) {
192 /* Frame is fragmented: duration increases with time needed to
193 * transmit next fragment plus ACK and 2 x SIFS. */
194 dur *= 2; /* ACK + SIFS */
195 /* next fragment */
196 dur += ieee80211_frame_duration(local, next_frag_len,
197 txrate->bitrate, erp,
198 tx->sdata->bss_conf.use_short_preamble);
199 }
200
201 return cpu_to_le16(dur);
202 }
203
204 static int inline is_ieee80211_device(struct net_device *dev,
205 struct net_device *master)
206 {
207 return (wdev_priv(dev->ieee80211_ptr) ==
208 wdev_priv(master->ieee80211_ptr));
209 }
210
211 /* tx handlers */
212
213 static ieee80211_tx_result debug_noinline
214 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
215 {
216 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
217 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
218 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
227 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
228 return TX_DROP;
229
230 if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT)
231 return TX_CONTINUE;
232
233 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
234 return TX_CONTINUE;
235
236 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
237
238 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
239 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
240 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
241 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
242 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
243 DECLARE_MAC_BUF(mac);
244 printk(KERN_DEBUG "%s: dropped data frame to not "
245 "associated station %s\n",
246 tx->dev->name, print_mac(mac, hdr->addr1));
247 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
248 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
249 return TX_DROP;
250 }
251 } else {
252 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
253 tx->local->num_sta == 0 &&
254 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
255 /*
256 * No associated STAs - no need to send multicast
257 * frames.
258 */
259 return TX_DROP;
260 }
261 return TX_CONTINUE;
262 }
263
264 return TX_CONTINUE;
265 }
266
267 /* This function is called whenever the AP is about to exceed the maximum limit
268 * of buffered frames for power saving STAs. This situation should not really
269 * happen often during normal operation, so dropping the oldest buffered packet
270 * from each queue should be OK to make some room for new frames. */
271 static void purge_old_ps_buffers(struct ieee80211_local *local)
272 {
273 int total = 0, purged = 0;
274 struct sk_buff *skb;
275 struct ieee80211_sub_if_data *sdata;
276 struct sta_info *sta;
277
278 /*
279 * virtual interfaces are protected by RCU
280 */
281 rcu_read_lock();
282
283 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
284 struct ieee80211_if_ap *ap;
285 if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
286 continue;
287 ap = &sdata->u.ap;
288 skb = skb_dequeue(&ap->ps_bc_buf);
289 if (skb) {
290 purged++;
291 dev_kfree_skb(skb);
292 }
293 total += skb_queue_len(&ap->ps_bc_buf);
294 }
295
296 list_for_each_entry_rcu(sta, &local->sta_list, list) {
297 skb = skb_dequeue(&sta->ps_tx_buf);
298 if (skb) {
299 purged++;
300 dev_kfree_skb(skb);
301 }
302 total += skb_queue_len(&sta->ps_tx_buf);
303 }
304
305 rcu_read_unlock();
306
307 local->total_ps_buffered = total;
308 #ifdef MAC80211_VERBOSE_PS_DEBUG
309 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
310 wiphy_name(local->hw.wiphy), purged);
311 #endif
312 }
313
314 static ieee80211_tx_result
315 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
316 {
317 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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 (tx->fc & IEEE80211_FCTL_ORDER)
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 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 u32 staflags;
371 DECLARE_MAC_BUF(mac);
372
373 if (unlikely(!sta ||
374 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
375 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
376 return TX_CONTINUE;
377
378 staflags = get_sta_flags(sta);
379
380 if (unlikely((staflags & WLAN_STA_PS) &&
381 !(staflags & WLAN_STA_PSPOLL))) {
382 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
383 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
384 "before %d)\n",
385 print_mac(mac, sta->addr), sta->aid,
386 skb_queue_len(&sta->ps_tx_buf));
387 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
388 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
389 purge_old_ps_buffers(tx->local);
390 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
391 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
392 #ifdef MAC80211_VERBOSE_PS_DEBUG
393 if (net_ratelimit()) {
394 printk(KERN_DEBUG "%s: STA %s TX "
395 "buffer full - dropping oldest frame\n",
396 tx->dev->name, print_mac(mac, sta->addr));
397 }
398 #endif
399 dev_kfree_skb(old);
400 } else
401 tx->local->total_ps_buffered++;
402
403 /* Queue frame to be sent after STA sends an PS Poll frame */
404 if (skb_queue_empty(&sta->ps_tx_buf))
405 sta_info_set_tim_bit(sta);
406
407 info->control.jiffies = jiffies;
408 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
409 return TX_QUEUED;
410 }
411 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
412 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
413 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
414 "set -> send frame\n", tx->dev->name,
415 print_mac(mac, sta->addr));
416 }
417 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
418 clear_sta_flags(sta, WLAN_STA_PSPOLL);
419
420 return TX_CONTINUE;
421 }
422
423 static ieee80211_tx_result debug_noinline
424 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
425 {
426 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
427 return TX_CONTINUE;
428
429 if (tx->flags & IEEE80211_TX_UNICAST)
430 return ieee80211_tx_h_unicast_ps_buf(tx);
431 else
432 return ieee80211_tx_h_multicast_ps_buf(tx);
433 }
434
435 static ieee80211_tx_result debug_noinline
436 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
437 {
438 struct ieee80211_key *key;
439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
440 u16 fc = tx->fc;
441
442 if (unlikely(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT))
443 tx->key = NULL;
444 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
445 tx->key = key;
446 else if ((key = rcu_dereference(tx->sdata->default_key)))
447 tx->key = key;
448 else if (tx->sdata->drop_unencrypted &&
449 !(info->flags & IEEE80211_TX_CTL_EAPOL_FRAME) &&
450 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
451 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
452 return TX_DROP;
453 } else
454 tx->key = NULL;
455
456 if (tx->key) {
457 u16 ftype, stype;
458
459 tx->key->tx_rx_count++;
460 /* TODO: add threshold stuff again */
461
462 switch (tx->key->conf.alg) {
463 case ALG_WEP:
464 ftype = fc & IEEE80211_FCTL_FTYPE;
465 stype = fc & IEEE80211_FCTL_STYPE;
466
467 if (ftype == IEEE80211_FTYPE_MGMT &&
468 stype == IEEE80211_STYPE_AUTH)
469 break;
470 case ALG_TKIP:
471 case ALG_CCMP:
472 if (!WLAN_FC_DATA_PRESENT(fc))
473 tx->key = NULL;
474 break;
475 }
476 }
477
478 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
479 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
480
481 return TX_CONTINUE;
482 }
483
484 static ieee80211_tx_result debug_noinline
485 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
486 {
487 struct rate_selection rsel;
488 struct ieee80211_supported_band *sband;
489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
490
491 sband = tx->local->hw.wiphy->bands[tx->channel->band];
492
493 if (likely(tx->rate_idx < 0)) {
494 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
495 tx->rate_idx = rsel.rate_idx;
496 if (unlikely(rsel.probe_idx >= 0)) {
497 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
498 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
499 info->control.alt_retry_rate_idx = tx->rate_idx;
500 tx->rate_idx = rsel.probe_idx;
501 } else
502 info->control.alt_retry_rate_idx = -1;
503
504 if (unlikely(tx->rate_idx < 0))
505 return TX_DROP;
506 } else
507 info->control.alt_retry_rate_idx = -1;
508
509 if (tx->sdata->bss_conf.use_cts_prot &&
510 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
511 tx->last_frag_rate_idx = tx->rate_idx;
512 if (rsel.probe_idx >= 0)
513 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
514 else
515 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
516 tx->rate_idx = rsel.nonerp_idx;
517 info->tx_rate_idx = rsel.nonerp_idx;
518 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
519 } else {
520 tx->last_frag_rate_idx = tx->rate_idx;
521 info->tx_rate_idx = tx->rate_idx;
522 }
523 info->tx_rate_idx = tx->rate_idx;
524
525 return TX_CONTINUE;
526 }
527
528 static ieee80211_tx_result debug_noinline
529 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
530 {
531 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
532 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
533 struct ieee80211_supported_band *sband;
534
535 sband = tx->local->hw.wiphy->bands[tx->channel->band];
536
537 if (tx->sta)
538 info->control.aid = tx->sta->aid;
539
540 if (!info->control.retry_limit) {
541 if (!is_multicast_ether_addr(hdr->addr1)) {
542 int len = min_t(int, tx->skb->len + FCS_LEN,
543 tx->local->fragmentation_threshold);
544 if (len > tx->local->rts_threshold
545 && tx->local->rts_threshold <
546 IEEE80211_MAX_RTS_THRESHOLD) {
547 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
548 info->flags |=
549 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
550 info->control.retry_limit =
551 tx->local->long_retry_limit;
552 } else {
553 info->control.retry_limit =
554 tx->local->short_retry_limit;
555 }
556 } else {
557 info->control.retry_limit = 1;
558 }
559 }
560
561 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
562 /* Do not use multiple retry rates when sending fragmented
563 * frames.
564 * TODO: The last fragment could still use multiple retry
565 * rates. */
566 info->control.alt_retry_rate_idx = -1;
567 }
568
569 /* Use CTS protection for unicast frames sent using extended rates if
570 * there are associated non-ERP stations and RTS/CTS is not configured
571 * for the frame. */
572 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
573 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
574 (tx->flags & IEEE80211_TX_UNICAST) &&
575 tx->sdata->bss_conf.use_cts_prot &&
576 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
577 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
578
579 /* Transmit data frames using short preambles if the driver supports
580 * short preambles at the selected rate and short preambles are
581 * available on the network at the current point in time. */
582 if (ieee80211_is_data(hdr->frame_control) &&
583 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
584 tx->sdata->bss_conf.use_short_preamble &&
585 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
586 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
587 }
588
589 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
590 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
591 struct ieee80211_rate *rate;
592 s8 baserate = -1;
593 int idx;
594
595 /* Do not use multiple retry rates when using RTS/CTS */
596 info->control.alt_retry_rate_idx = -1;
597
598 /* Use min(data rate, max base rate) as CTS/RTS rate */
599 rate = &sband->bitrates[tx->rate_idx];
600
601 for (idx = 0; idx < sband->n_bitrates; idx++) {
602 if (sband->bitrates[idx].bitrate > rate->bitrate)
603 continue;
604 if (tx->sdata->basic_rates & BIT(idx) &&
605 (baserate < 0 ||
606 (sband->bitrates[baserate].bitrate
607 < sband->bitrates[idx].bitrate)))
608 baserate = idx;
609 }
610
611 if (baserate >= 0)
612 info->control.rts_cts_rate_idx = baserate;
613 else
614 info->control.rts_cts_rate_idx = 0;
615 }
616
617 if (tx->sta)
618 info->control.aid = tx->sta->aid;
619
620 return TX_CONTINUE;
621 }
622
623 static ieee80211_tx_result debug_noinline
624 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
625 {
626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
627 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
628 u16 *seq;
629 u8 *qc;
630 int tid;
631
632 /* only for injected frames */
633 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
634 return TX_CONTINUE;
635
636 if (ieee80211_hdrlen(hdr->frame_control) < 24)
637 return TX_CONTINUE;
638
639 if (!ieee80211_is_data_qos(hdr->frame_control)) {
640 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
641 return TX_CONTINUE;
642 }
643
644 /*
645 * This should be true for injected/management frames only, for
646 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
647 * above since they are not QoS-data frames.
648 */
649 if (!tx->sta)
650 return TX_CONTINUE;
651
652 /* include per-STA, per-TID sequence counter */
653
654 qc = ieee80211_get_qos_ctl(hdr);
655 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
656 seq = &tx->sta->tid_seq[tid];
657
658 hdr->seq_ctrl = cpu_to_le16(*seq);
659
660 /* Increase the sequence number. */
661 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
662
663 return TX_CONTINUE;
664 }
665
666 static ieee80211_tx_result debug_noinline
667 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
668 {
669 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
670 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
671 struct sk_buff **frags, *first, *frag;
672 int i;
673 u16 seq;
674 u8 *pos;
675 int frag_threshold = tx->local->fragmentation_threshold;
676
677 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
678 return TX_CONTINUE;
679
680 /*
681 * Warn when submitting a fragmented A-MPDU frame and drop it.
682 * This scenario is handled in __ieee80211_tx_prepare but extra
683 * caution taken here as fragmented ampdu may cause Tx stop.
684 */
685 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
686 skb_get_queue_mapping(tx->skb) >=
687 ieee80211_num_regular_queues(&tx->local->hw)))
688 return TX_DROP;
689
690 first = tx->skb;
691
692 hdrlen = ieee80211_hdrlen(hdr->frame_control);
693 payload_len = first->len - hdrlen;
694 per_fragm = frag_threshold - hdrlen - FCS_LEN;
695 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
696
697 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
698 if (!frags)
699 goto fail;
700
701 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
702 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
703 pos = first->data + hdrlen + per_fragm;
704 left = payload_len - per_fragm;
705 for (i = 0; i < num_fragm - 1; i++) {
706 struct ieee80211_hdr *fhdr;
707 size_t copylen;
708
709 if (left <= 0)
710 goto fail;
711
712 /* reserve enough extra head and tail room for possible
713 * encryption */
714 frag = frags[i] =
715 dev_alloc_skb(tx->local->tx_headroom +
716 frag_threshold +
717 IEEE80211_ENCRYPT_HEADROOM +
718 IEEE80211_ENCRYPT_TAILROOM);
719 if (!frag)
720 goto fail;
721 /* Make sure that all fragments use the same priority so
722 * that they end up using the same TX queue */
723 frag->priority = first->priority;
724 skb_reserve(frag, tx->local->tx_headroom +
725 IEEE80211_ENCRYPT_HEADROOM);
726 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
727 memcpy(fhdr, first->data, hdrlen);
728 if (i == num_fragm - 2)
729 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
730 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
731 copylen = left > per_fragm ? per_fragm : left;
732 memcpy(skb_put(frag, copylen), pos, copylen);
733 memcpy(frag->cb, first->cb, sizeof(frag->cb));
734 skb_copy_queue_mapping(frag, first);
735
736 pos += copylen;
737 left -= copylen;
738 }
739 skb_trim(first, hdrlen + per_fragm);
740
741 tx->num_extra_frag = num_fragm - 1;
742 tx->extra_frag = frags;
743
744 return TX_CONTINUE;
745
746 fail:
747 if (frags) {
748 for (i = 0; i < num_fragm - 1; i++)
749 if (frags[i])
750 dev_kfree_skb(frags[i]);
751 kfree(frags);
752 }
753 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
754 return TX_DROP;
755 }
756
757 static ieee80211_tx_result debug_noinline
758 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
759 {
760 if (!tx->key)
761 return TX_CONTINUE;
762
763 switch (tx->key->conf.alg) {
764 case ALG_WEP:
765 return ieee80211_crypto_wep_encrypt(tx);
766 case ALG_TKIP:
767 return ieee80211_crypto_tkip_encrypt(tx);
768 case ALG_CCMP:
769 return ieee80211_crypto_ccmp_encrypt(tx);
770 }
771
772 /* not reached */
773 WARN_ON(1);
774 return TX_DROP;
775 }
776
777 static ieee80211_tx_result debug_noinline
778 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
779 {
780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
781 int next_len, i;
782 int group_addr = is_multicast_ether_addr(hdr->addr1);
783
784 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
785 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
786 return TX_CONTINUE;
787 }
788
789 hdr->duration_id = ieee80211_duration(tx, group_addr,
790 tx->extra_frag[0]->len);
791
792 for (i = 0; i < tx->num_extra_frag; i++) {
793 if (i + 1 < tx->num_extra_frag) {
794 next_len = tx->extra_frag[i + 1]->len;
795 } else {
796 next_len = 0;
797 tx->rate_idx = tx->last_frag_rate_idx;
798 }
799
800 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
801 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
802 }
803
804 return TX_CONTINUE;
805 }
806
807 static ieee80211_tx_result debug_noinline
808 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
809 {
810 int i;
811
812 if (!tx->sta)
813 return TX_CONTINUE;
814
815 tx->sta->tx_packets++;
816 tx->sta->tx_fragments++;
817 tx->sta->tx_bytes += tx->skb->len;
818 if (tx->extra_frag) {
819 tx->sta->tx_fragments += tx->num_extra_frag;
820 for (i = 0; i < tx->num_extra_frag; i++)
821 tx->sta->tx_bytes += tx->extra_frag[i]->len;
822 }
823
824 return TX_CONTINUE;
825 }
826
827
828 /* actual transmit path */
829
830 /*
831 * deal with packet injection down monitor interface
832 * with Radiotap Header -- only called for monitor mode interface
833 */
834 static ieee80211_tx_result
835 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
836 struct sk_buff *skb)
837 {
838 /*
839 * this is the moment to interpret and discard the radiotap header that
840 * must be at the start of the packet injected in Monitor mode
841 *
842 * Need to take some care with endian-ness since radiotap
843 * args are little-endian
844 */
845
846 struct ieee80211_radiotap_iterator iterator;
847 struct ieee80211_radiotap_header *rthdr =
848 (struct ieee80211_radiotap_header *) skb->data;
849 struct ieee80211_supported_band *sband;
850 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
851 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
852
853 sband = tx->local->hw.wiphy->bands[tx->channel->band];
854
855 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
856 info->flags |= IEEE80211_TX_CTL_INJECTED;
857 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
858
859 /*
860 * for every radiotap entry that is present
861 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
862 * entries present, or -EINVAL on error)
863 */
864
865 while (!ret) {
866 int i, target_rate;
867
868 ret = ieee80211_radiotap_iterator_next(&iterator);
869
870 if (ret)
871 continue;
872
873 /* see if this argument is something we can use */
874 switch (iterator.this_arg_index) {
875 /*
876 * You must take care when dereferencing iterator.this_arg
877 * for multibyte types... the pointer is not aligned. Use
878 * get_unaligned((type *)iterator.this_arg) to dereference
879 * iterator.this_arg for type "type" safely on all arches.
880 */
881 case IEEE80211_RADIOTAP_RATE:
882 /*
883 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
884 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
885 */
886 target_rate = (*iterator.this_arg) * 5;
887 for (i = 0; i < sband->n_bitrates; i++) {
888 struct ieee80211_rate *r;
889
890 r = &sband->bitrates[i];
891
892 if (r->bitrate == target_rate) {
893 tx->rate_idx = i;
894 break;
895 }
896 }
897 break;
898
899 case IEEE80211_RADIOTAP_ANTENNA:
900 /*
901 * radiotap uses 0 for 1st ant, mac80211 is 1 for
902 * 1st ant
903 */
904 info->antenna_sel_tx = (*iterator.this_arg) + 1;
905 break;
906
907 #if 0
908 case IEEE80211_RADIOTAP_DBM_TX_POWER:
909 control->power_level = *iterator.this_arg;
910 break;
911 #endif
912
913 case IEEE80211_RADIOTAP_FLAGS:
914 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
915 /*
916 * this indicates that the skb we have been
917 * handed has the 32-bit FCS CRC at the end...
918 * we should react to that by snipping it off
919 * because it will be recomputed and added
920 * on transmission
921 */
922 if (skb->len < (iterator.max_length + FCS_LEN))
923 return TX_DROP;
924
925 skb_trim(skb, skb->len - FCS_LEN);
926 }
927 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
928 info->flags &=
929 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
930 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
931 tx->flags |= IEEE80211_TX_FRAGMENTED;
932 break;
933
934 /*
935 * Please update the file
936 * Documentation/networking/mac80211-injection.txt
937 * when parsing new fields here.
938 */
939
940 default:
941 break;
942 }
943 }
944
945 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
946 return TX_DROP;
947
948 /*
949 * remove the radiotap header
950 * iterator->max_length was sanity-checked against
951 * skb->len by iterator init
952 */
953 skb_pull(skb, iterator.max_length);
954
955 return TX_CONTINUE;
956 }
957
958 /*
959 * initialises @tx
960 */
961 static ieee80211_tx_result
962 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
963 struct sk_buff *skb,
964 struct net_device *dev)
965 {
966 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
967 struct ieee80211_hdr *hdr;
968 struct ieee80211_sub_if_data *sdata;
969 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
970
971 int hdrlen;
972
973 memset(tx, 0, sizeof(*tx));
974 tx->skb = skb;
975 tx->dev = dev; /* use original interface */
976 tx->local = local;
977 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
978 tx->channel = local->hw.conf.channel;
979 tx->rate_idx = -1;
980 tx->last_frag_rate_idx = -1;
981 /*
982 * Set this flag (used below to indicate "automatic fragmentation"),
983 * it will be cleared/left by radiotap as desired.
984 */
985 tx->flags |= IEEE80211_TX_FRAGMENTED;
986
987 /* process and remove the injection radiotap header */
988 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
989 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
990 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
991 return TX_DROP;
992
993 /*
994 * __ieee80211_parse_tx_radiotap has now removed
995 * the radiotap header that was present and pre-filled
996 * 'tx' with tx control information.
997 */
998 }
999
1000 hdr = (struct ieee80211_hdr *) skb->data;
1001
1002 tx->sta = sta_info_get(local, hdr->addr1);
1003 tx->fc = le16_to_cpu(hdr->frame_control);
1004
1005 if (is_multicast_ether_addr(hdr->addr1)) {
1006 tx->flags &= ~IEEE80211_TX_UNICAST;
1007 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1008 } else {
1009 tx->flags |= IEEE80211_TX_UNICAST;
1010 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1011 }
1012
1013 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1014 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1015 skb->len + FCS_LEN > local->fragmentation_threshold &&
1016 !local->ops->set_frag_threshold &&
1017 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1018 tx->flags |= IEEE80211_TX_FRAGMENTED;
1019 else
1020 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1021 }
1022
1023 if (!tx->sta)
1024 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1025 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1026 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1027
1028 hdrlen = ieee80211_get_hdrlen(tx->fc);
1029 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1030 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1031 tx->ethertype = (pos[0] << 8) | pos[1];
1032 }
1033 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1034
1035 return TX_CONTINUE;
1036 }
1037
1038 /*
1039 * NB: @tx is uninitialised when passed in here
1040 */
1041 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1042 struct sk_buff *skb,
1043 struct net_device *mdev)
1044 {
1045 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1046 struct net_device *dev;
1047
1048 dev = dev_get_by_index(&init_net, info->control.ifindex);
1049 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1050 dev_put(dev);
1051 dev = NULL;
1052 }
1053 if (unlikely(!dev))
1054 return -ENODEV;
1055 /* initialises tx with control */
1056 __ieee80211_tx_prepare(tx, skb, dev);
1057 dev_put(dev);
1058 return 0;
1059 }
1060
1061 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1062 struct ieee80211_tx_data *tx)
1063 {
1064 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1065 int ret, i;
1066
1067 if (netif_subqueue_stopped(local->mdev, skb))
1068 return IEEE80211_TX_AGAIN;
1069
1070 if (skb) {
1071 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1072 "TX to low-level driver", skb);
1073 ret = local->ops->tx(local_to_hw(local), skb);
1074 if (ret)
1075 return IEEE80211_TX_AGAIN;
1076 local->mdev->trans_start = jiffies;
1077 ieee80211_led_tx(local, 1);
1078 }
1079 if (tx->extra_frag) {
1080 for (i = 0; i < tx->num_extra_frag; i++) {
1081 if (!tx->extra_frag[i])
1082 continue;
1083 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1084 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1085 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1086 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1087 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1088 if (netif_subqueue_stopped(local->mdev,
1089 tx->extra_frag[i]))
1090 return IEEE80211_TX_FRAG_AGAIN;
1091 if (i == tx->num_extra_frag) {
1092 info->tx_rate_idx = tx->last_frag_rate_idx;
1093
1094 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1095 info->flags |=
1096 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1097 else
1098 info->flags &=
1099 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1100 }
1101
1102 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1103 "TX to low-level driver",
1104 tx->extra_frag[i]);
1105 ret = local->ops->tx(local_to_hw(local),
1106 tx->extra_frag[i]);
1107 if (ret)
1108 return IEEE80211_TX_FRAG_AGAIN;
1109 local->mdev->trans_start = jiffies;
1110 ieee80211_led_tx(local, 1);
1111 tx->extra_frag[i] = NULL;
1112 }
1113 kfree(tx->extra_frag);
1114 tx->extra_frag = NULL;
1115 }
1116 return IEEE80211_TX_OK;
1117 }
1118
1119 /*
1120 * Invoke TX handlers, return 0 on success and non-zero if the
1121 * frame was dropped or queued.
1122 */
1123 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1124 {
1125 struct sk_buff *skb = tx->skb;
1126 ieee80211_tx_result res = TX_DROP;
1127 int i;
1128
1129 #define CALL_TXH(txh) \
1130 res = txh(tx); \
1131 if (res != TX_CONTINUE) \
1132 goto txh_done;
1133
1134 CALL_TXH(ieee80211_tx_h_check_assoc)
1135 CALL_TXH(ieee80211_tx_h_ps_buf)
1136 CALL_TXH(ieee80211_tx_h_select_key)
1137 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1138 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1139 CALL_TXH(ieee80211_tx_h_misc)
1140 CALL_TXH(ieee80211_tx_h_sequence)
1141 CALL_TXH(ieee80211_tx_h_fragment)
1142 /* handlers after fragment must be aware of tx info fragmentation! */
1143 CALL_TXH(ieee80211_tx_h_encrypt)
1144 CALL_TXH(ieee80211_tx_h_calculate_duration)
1145 CALL_TXH(ieee80211_tx_h_stats)
1146 #undef CALL_TXH
1147
1148 txh_done:
1149 if (unlikely(res == TX_DROP)) {
1150 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1151 dev_kfree_skb(skb);
1152 for (i = 0; i < tx->num_extra_frag; i++)
1153 if (tx->extra_frag[i])
1154 dev_kfree_skb(tx->extra_frag[i]);
1155 kfree(tx->extra_frag);
1156 return -1;
1157 } else if (unlikely(res == TX_QUEUED)) {
1158 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1159 return -1;
1160 }
1161
1162 return 0;
1163 }
1164
1165 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1166 {
1167 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1168 struct sta_info *sta;
1169 struct ieee80211_tx_data tx;
1170 ieee80211_tx_result res_prepare;
1171 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1172 int ret, i;
1173 u16 queue;
1174
1175 queue = skb_get_queue_mapping(skb);
1176
1177 WARN_ON(test_bit(queue, local->queues_pending));
1178
1179 if (unlikely(skb->len < 10)) {
1180 dev_kfree_skb(skb);
1181 return 0;
1182 }
1183
1184 rcu_read_lock();
1185
1186 /* initialises tx */
1187 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1188
1189 if (res_prepare == TX_DROP) {
1190 dev_kfree_skb(skb);
1191 rcu_read_unlock();
1192 return 0;
1193 }
1194
1195 sta = tx.sta;
1196 tx.channel = local->hw.conf.channel;
1197 info->band = tx.channel->band;
1198
1199 if (invoke_tx_handlers(&tx))
1200 goto out;
1201
1202 retry:
1203 ret = __ieee80211_tx(local, skb, &tx);
1204 if (ret) {
1205 struct ieee80211_tx_stored_packet *store;
1206
1207 /*
1208 * Since there are no fragmented frames on A-MPDU
1209 * queues, there's no reason for a driver to reject
1210 * a frame there, warn and drop it.
1211 */
1212 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1213 goto drop;
1214
1215 store = &local->pending_packet[queue];
1216
1217 if (ret == IEEE80211_TX_FRAG_AGAIN)
1218 skb = NULL;
1219 set_bit(queue, local->queues_pending);
1220 smp_mb();
1221 /*
1222 * When the driver gets out of buffers during sending of
1223 * fragments and calls ieee80211_stop_queue, the netif
1224 * subqueue is stopped. There is, however, a small window
1225 * in which the PENDING bit is not yet set. If a buffer
1226 * gets available in that window (i.e. driver calls
1227 * ieee80211_wake_queue), we would end up with ieee80211_tx
1228 * called with the PENDING bit still set. Prevent this by
1229 * continuing transmitting here when that situation is
1230 * possible to have happened.
1231 */
1232 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1233 clear_bit(queue, local->queues_pending);
1234 goto retry;
1235 }
1236 store->skb = skb;
1237 store->extra_frag = tx.extra_frag;
1238 store->num_extra_frag = tx.num_extra_frag;
1239 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1240 store->last_frag_rate_ctrl_probe =
1241 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1242 }
1243 out:
1244 rcu_read_unlock();
1245 return 0;
1246
1247 drop:
1248 if (skb)
1249 dev_kfree_skb(skb);
1250 for (i = 0; i < tx.num_extra_frag; i++)
1251 if (tx.extra_frag[i])
1252 dev_kfree_skb(tx.extra_frag[i]);
1253 kfree(tx.extra_frag);
1254 rcu_read_unlock();
1255 return 0;
1256 }
1257
1258 /* device xmit handlers */
1259
1260 static int ieee80211_skb_resize(struct ieee80211_local *local,
1261 struct sk_buff *skb,
1262 int head_need, bool may_encrypt)
1263 {
1264 int tail_need = 0;
1265
1266 /*
1267 * This could be optimised, devices that do full hardware
1268 * crypto (including TKIP MMIC) need no tailroom... But we
1269 * have no drivers for such devices currently.
1270 */
1271 if (may_encrypt) {
1272 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1273 tail_need -= skb_tailroom(skb);
1274 tail_need = max_t(int, tail_need, 0);
1275 }
1276
1277 if (head_need || tail_need) {
1278 /* Sorry. Can't account for this any more */
1279 skb_orphan(skb);
1280 }
1281
1282 if (skb_header_cloned(skb))
1283 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1284 else
1285 I802_DEBUG_INC(local->tx_expand_skb_head);
1286
1287 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1288 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1289 wiphy_name(local->hw.wiphy));
1290 return -ENOMEM;
1291 }
1292
1293 /* update truesize too */
1294 skb->truesize += head_need + tail_need;
1295
1296 return 0;
1297 }
1298
1299 int ieee80211_master_start_xmit(struct sk_buff *skb,
1300 struct net_device *dev)
1301 {
1302 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1303 struct net_device *odev = NULL;
1304 struct ieee80211_sub_if_data *osdata;
1305 int headroom;
1306 bool may_encrypt;
1307 int ret;
1308
1309 if (info->control.ifindex)
1310 odev = dev_get_by_index(&init_net, info->control.ifindex);
1311 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1312 dev_put(odev);
1313 odev = NULL;
1314 }
1315 if (unlikely(!odev)) {
1316 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1317 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1318 "originating device\n", dev->name);
1319 #endif
1320 dev_kfree_skb(skb);
1321 return 0;
1322 }
1323
1324 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1325
1326 may_encrypt = !(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT);
1327
1328 headroom = osdata->local->tx_headroom;
1329 if (may_encrypt)
1330 headroom += IEEE80211_ENCRYPT_HEADROOM;
1331 headroom -= skb_headroom(skb);
1332 headroom = max_t(int, 0, headroom);
1333
1334 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1335 dev_kfree_skb(skb);
1336 dev_put(odev);
1337 return 0;
1338 }
1339
1340 info->control.vif = &osdata->vif;
1341 ret = ieee80211_tx(odev, skb);
1342 dev_put(odev);
1343
1344 return ret;
1345 }
1346
1347 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1348 struct net_device *dev)
1349 {
1350 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1351 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1352 struct ieee80211_radiotap_header *prthdr =
1353 (struct ieee80211_radiotap_header *)skb->data;
1354 u16 len_rthdr;
1355
1356 /* check for not even having the fixed radiotap header part */
1357 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1358 goto fail; /* too short to be possibly valid */
1359
1360 /* is it a header version we can trust to find length from? */
1361 if (unlikely(prthdr->it_version))
1362 goto fail; /* only version 0 is supported */
1363
1364 /* then there must be a radiotap header with a length we can use */
1365 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1366
1367 /* does the skb contain enough to deliver on the alleged length? */
1368 if (unlikely(skb->len < len_rthdr))
1369 goto fail; /* skb too short for claimed rt header extent */
1370
1371 skb->dev = local->mdev;
1372
1373 /* needed because we set skb device to master */
1374 info->control.ifindex = dev->ifindex;
1375
1376 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1377 /* Interfaces should always request a status report */
1378 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1379
1380 /*
1381 * fix up the pointers accounting for the radiotap
1382 * header still being in there. We are being given
1383 * a precooked IEEE80211 header so no need for
1384 * normal processing
1385 */
1386 skb_set_mac_header(skb, len_rthdr);
1387 /*
1388 * these are just fixed to the end of the rt area since we
1389 * don't have any better information and at this point, nobody cares
1390 */
1391 skb_set_network_header(skb, len_rthdr);
1392 skb_set_transport_header(skb, len_rthdr);
1393
1394 /* pass the radiotap header up to the next stage intact */
1395 dev_queue_xmit(skb);
1396 return NETDEV_TX_OK;
1397
1398 fail:
1399 dev_kfree_skb(skb);
1400 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1401 }
1402
1403 /**
1404 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1405 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1406 * @skb: packet to be sent
1407 * @dev: incoming interface
1408 *
1409 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1410 * not be freed, and caller is responsible for either retrying later or freeing
1411 * skb).
1412 *
1413 * This function takes in an Ethernet header and encapsulates it with suitable
1414 * IEEE 802.11 header based on which interface the packet is coming in. The
1415 * encapsulated packet will then be passed to master interface, wlan#.11, for
1416 * transmission (through low-level driver).
1417 */
1418 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1419 struct net_device *dev)
1420 {
1421 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1422 struct ieee80211_tx_info *info;
1423 struct ieee80211_sub_if_data *sdata;
1424 int ret = 1, head_need;
1425 u16 ethertype, hdrlen, meshhdrlen = 0;
1426 __le16 fc;
1427 struct ieee80211_hdr hdr;
1428 struct ieee80211s_hdr mesh_hdr;
1429 const u8 *encaps_data;
1430 int encaps_len, skip_header_bytes;
1431 int nh_pos, h_pos;
1432 struct sta_info *sta;
1433 u32 sta_flags = 0;
1434
1435 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1436 if (unlikely(skb->len < ETH_HLEN)) {
1437 ret = 0;
1438 goto fail;
1439 }
1440
1441 nh_pos = skb_network_header(skb) - skb->data;
1442 h_pos = skb_transport_header(skb) - skb->data;
1443
1444 /* convert Ethernet header to proper 802.11 header (based on
1445 * operation mode) */
1446 ethertype = (skb->data[12] << 8) | skb->data[13];
1447 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1448
1449 switch (sdata->vif.type) {
1450 case IEEE80211_IF_TYPE_AP:
1451 case IEEE80211_IF_TYPE_VLAN:
1452 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1453 /* DA BSSID SA */
1454 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1455 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1456 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1457 hdrlen = 24;
1458 break;
1459 case IEEE80211_IF_TYPE_WDS:
1460 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1461 /* RA TA DA SA */
1462 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1463 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1464 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1465 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1466 hdrlen = 30;
1467 break;
1468 #ifdef CONFIG_MAC80211_MESH
1469 case IEEE80211_IF_TYPE_MESH_POINT:
1470 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1471 /* RA TA DA SA */
1472 if (is_multicast_ether_addr(skb->data))
1473 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1474 else if (mesh_nexthop_lookup(hdr.addr1, skb, dev))
1475 return 0;
1476 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1477 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1478 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1479 if (skb->pkt_type == PACKET_OTHERHOST) {
1480 /* Forwarded frame, keep mesh ttl and seqnum */
1481 struct ieee80211s_hdr *prev_meshhdr;
1482 prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb);
1483 meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr);
1484 memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen);
1485 sdata->u.sta.mshstats.fwded_frames++;
1486 } else {
1487 if (!sdata->u.sta.mshcfg.dot11MeshTTL) {
1488 /* Do not send frames with mesh_ttl == 0 */
1489 sdata->u.sta.mshstats.dropped_frames_ttl++;
1490 ret = 0;
1491 goto fail;
1492 }
1493 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1494 sdata);
1495 }
1496 hdrlen = 30;
1497 break;
1498 #endif
1499 case IEEE80211_IF_TYPE_STA:
1500 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1501 /* BSSID SA DA */
1502 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1503 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1504 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1505 hdrlen = 24;
1506 break;
1507 case IEEE80211_IF_TYPE_IBSS:
1508 /* DA SA BSSID */
1509 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1510 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1511 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1512 hdrlen = 24;
1513 break;
1514 default:
1515 ret = 0;
1516 goto fail;
1517 }
1518
1519 /*
1520 * There's no need to try to look up the destination
1521 * if it is a multicast address (which can only happen
1522 * in AP mode)
1523 */
1524 if (!is_multicast_ether_addr(hdr.addr1)) {
1525 rcu_read_lock();
1526 sta = sta_info_get(local, hdr.addr1);
1527 if (sta)
1528 sta_flags = get_sta_flags(sta);
1529 rcu_read_unlock();
1530 }
1531
1532 /* receiver and we are QoS enabled, use a QoS type frame */
1533 if (sta_flags & WLAN_STA_WME &&
1534 ieee80211_num_regular_queues(&local->hw) >= 4) {
1535 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1536 hdrlen += 2;
1537 }
1538
1539 /*
1540 * Drop unicast frames to unauthorised stations unless they are
1541 * EAPOL frames from the local station.
1542 */
1543 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1544 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1545 !(ethertype == ETH_P_PAE &&
1546 compare_ether_addr(dev->dev_addr,
1547 skb->data + ETH_ALEN) == 0))) {
1548 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1549 DECLARE_MAC_BUF(mac);
1550
1551 if (net_ratelimit())
1552 printk(KERN_DEBUG "%s: dropped frame to %s"
1553 " (unauthorized port)\n", dev->name,
1554 print_mac(mac, hdr.addr1));
1555 #endif
1556
1557 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1558
1559 ret = 0;
1560 goto fail;
1561 }
1562
1563 hdr.frame_control = fc;
1564 hdr.duration_id = 0;
1565 hdr.seq_ctrl = 0;
1566
1567 skip_header_bytes = ETH_HLEN;
1568 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1569 encaps_data = bridge_tunnel_header;
1570 encaps_len = sizeof(bridge_tunnel_header);
1571 skip_header_bytes -= 2;
1572 } else if (ethertype >= 0x600) {
1573 encaps_data = rfc1042_header;
1574 encaps_len = sizeof(rfc1042_header);
1575 skip_header_bytes -= 2;
1576 } else {
1577 encaps_data = NULL;
1578 encaps_len = 0;
1579 }
1580
1581 skb_pull(skb, skip_header_bytes);
1582 nh_pos -= skip_header_bytes;
1583 h_pos -= skip_header_bytes;
1584
1585 /* TODO: implement support for fragments so that there is no need to
1586 * reallocate and copy payload; it might be enough to support one
1587 * extra fragment that would be copied in the beginning of the frame
1588 * data.. anyway, it would be nice to include this into skb structure
1589 * somehow
1590 *
1591 * There are few options for this:
1592 * use skb->cb as an extra space for 802.11 header
1593 * allocate new buffer if not enough headroom
1594 * make sure that there is enough headroom in every skb by increasing
1595 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1596 * alloc_skb() (net/core/skbuff.c)
1597 */
1598 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1599
1600 /*
1601 * So we need to modify the skb header and hence need a copy of
1602 * that. The head_need variable above doesn't, so far, include
1603 * the needed header space that we don't need right away. If we
1604 * can, then we don't reallocate right now but only after the
1605 * frame arrives at the master device (if it does...)
1606 *
1607 * If we cannot, however, then we will reallocate to include all
1608 * the ever needed space. Also, if we need to reallocate it anyway,
1609 * make it big enough for everything we may ever need.
1610 */
1611
1612 if (head_need > 0 || skb_cloned(skb)) {
1613 head_need += IEEE80211_ENCRYPT_HEADROOM;
1614 head_need += local->tx_headroom;
1615 head_need = max_t(int, 0, head_need);
1616 if (ieee80211_skb_resize(local, skb, head_need, true))
1617 goto fail;
1618 }
1619
1620 if (encaps_data) {
1621 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1622 nh_pos += encaps_len;
1623 h_pos += encaps_len;
1624 }
1625
1626 if (meshhdrlen > 0) {
1627 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1628 nh_pos += meshhdrlen;
1629 h_pos += meshhdrlen;
1630 }
1631
1632 if (ieee80211_is_data_qos(fc)) {
1633 __le16 *qos_control;
1634
1635 qos_control = (__le16*) skb_push(skb, 2);
1636 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1637 /*
1638 * Maybe we could actually set some fields here, for now just
1639 * initialise to zero to indicate no special operation.
1640 */
1641 *qos_control = 0;
1642 } else
1643 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1644
1645 nh_pos += hdrlen;
1646 h_pos += hdrlen;
1647
1648 info = IEEE80211_SKB_CB(skb);
1649 memset(info, 0, sizeof(*info));
1650 info->control.ifindex = dev->ifindex;
1651 if (ethertype == ETH_P_PAE)
1652 info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME;
1653
1654 /* Interfaces should always request a status report */
1655 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1656
1657 skb->dev = local->mdev;
1658 dev->stats.tx_packets++;
1659 dev->stats.tx_bytes += skb->len;
1660
1661 /* Update skb pointers to various headers since this modified frame
1662 * is going to go through Linux networking code that may potentially
1663 * need things like pointer to IP header. */
1664 skb_set_mac_header(skb, 0);
1665 skb_set_network_header(skb, nh_pos);
1666 skb_set_transport_header(skb, h_pos);
1667
1668 dev->trans_start = jiffies;
1669 dev_queue_xmit(skb);
1670
1671 return 0;
1672
1673 fail:
1674 if (!ret)
1675 dev_kfree_skb(skb);
1676
1677 return ret;
1678 }
1679
1680
1681 /*
1682 * ieee80211_clear_tx_pending may not be called in a context where
1683 * it is possible that it packets could come in again.
1684 */
1685 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1686 {
1687 int i, j;
1688 struct ieee80211_tx_stored_packet *store;
1689
1690 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1691 if (!test_bit(i, local->queues_pending))
1692 continue;
1693 store = &local->pending_packet[i];
1694 kfree_skb(store->skb);
1695 for (j = 0; j < store->num_extra_frag; j++)
1696 kfree_skb(store->extra_frag[j]);
1697 kfree(store->extra_frag);
1698 clear_bit(i, local->queues_pending);
1699 }
1700 }
1701
1702 /*
1703 * Transmit all pending packets. Called from tasklet, locks master device
1704 * TX lock so that no new packets can come in.
1705 */
1706 void ieee80211_tx_pending(unsigned long data)
1707 {
1708 struct ieee80211_local *local = (struct ieee80211_local *)data;
1709 struct net_device *dev = local->mdev;
1710 struct ieee80211_tx_stored_packet *store;
1711 struct ieee80211_tx_data tx;
1712 int i, ret;
1713
1714 netif_tx_lock_bh(dev);
1715 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1716 /* Check that this queue is ok */
1717 if (__netif_subqueue_stopped(local->mdev, i))
1718 continue;
1719
1720 if (!test_bit(i, local->queues_pending)) {
1721 ieee80211_wake_queue(&local->hw, i);
1722 continue;
1723 }
1724
1725 store = &local->pending_packet[i];
1726 tx.extra_frag = store->extra_frag;
1727 tx.num_extra_frag = store->num_extra_frag;
1728 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1729 tx.flags = 0;
1730 if (store->last_frag_rate_ctrl_probe)
1731 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1732 ret = __ieee80211_tx(local, store->skb, &tx);
1733 if (ret) {
1734 if (ret == IEEE80211_TX_FRAG_AGAIN)
1735 store->skb = NULL;
1736 } else {
1737 clear_bit(i, local->queues_pending);
1738 ieee80211_wake_queue(&local->hw, i);
1739 }
1740 }
1741 netif_tx_unlock_bh(dev);
1742 }
1743
1744 /* functions for drivers to get certain frames */
1745
1746 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1747 struct ieee80211_if_ap *bss,
1748 struct sk_buff *skb,
1749 struct beacon_data *beacon)
1750 {
1751 u8 *pos, *tim;
1752 int aid0 = 0;
1753 int i, have_bits = 0, n1, n2;
1754
1755 /* Generate bitmap for TIM only if there are any STAs in power save
1756 * mode. */
1757 if (atomic_read(&bss->num_sta_ps) > 0)
1758 /* in the hope that this is faster than
1759 * checking byte-for-byte */
1760 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1761 IEEE80211_MAX_AID+1);
1762
1763 if (bss->dtim_count == 0)
1764 bss->dtim_count = beacon->dtim_period - 1;
1765 else
1766 bss->dtim_count--;
1767
1768 tim = pos = (u8 *) skb_put(skb, 6);
1769 *pos++ = WLAN_EID_TIM;
1770 *pos++ = 4;
1771 *pos++ = bss->dtim_count;
1772 *pos++ = beacon->dtim_period;
1773
1774 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1775 aid0 = 1;
1776
1777 if (have_bits) {
1778 /* Find largest even number N1 so that bits numbered 1 through
1779 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1780 * (N2 + 1) x 8 through 2007 are 0. */
1781 n1 = 0;
1782 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1783 if (bss->tim[i]) {
1784 n1 = i & 0xfe;
1785 break;
1786 }
1787 }
1788 n2 = n1;
1789 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1790 if (bss->tim[i]) {
1791 n2 = i;
1792 break;
1793 }
1794 }
1795
1796 /* Bitmap control */
1797 *pos++ = n1 | aid0;
1798 /* Part Virt Bitmap */
1799 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1800
1801 tim[1] = n2 - n1 + 4;
1802 skb_put(skb, n2 - n1);
1803 } else {
1804 *pos++ = aid0; /* Bitmap control */
1805 *pos++ = 0; /* Part Virt Bitmap */
1806 }
1807 }
1808
1809 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1810 struct ieee80211_vif *vif)
1811 {
1812 struct ieee80211_local *local = hw_to_local(hw);
1813 struct sk_buff *skb = NULL;
1814 struct ieee80211_tx_info *info;
1815 struct net_device *bdev;
1816 struct ieee80211_sub_if_data *sdata = NULL;
1817 struct ieee80211_if_ap *ap = NULL;
1818 struct ieee80211_if_sta *ifsta = NULL;
1819 struct rate_selection rsel;
1820 struct beacon_data *beacon;
1821 struct ieee80211_supported_band *sband;
1822 struct ieee80211_mgmt *mgmt;
1823 int *num_beacons;
1824 enum ieee80211_band band = local->hw.conf.channel->band;
1825 u8 *pos;
1826
1827 sband = local->hw.wiphy->bands[band];
1828
1829 rcu_read_lock();
1830
1831 sdata = vif_to_sdata(vif);
1832 bdev = sdata->dev;
1833
1834 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1835 ap = &sdata->u.ap;
1836 beacon = rcu_dereference(ap->beacon);
1837 if (ap && beacon) {
1838 /*
1839 * headroom, head length,
1840 * tail length and maximum TIM length
1841 */
1842 skb = dev_alloc_skb(local->tx_headroom +
1843 beacon->head_len +
1844 beacon->tail_len + 256);
1845 if (!skb)
1846 goto out;
1847
1848 skb_reserve(skb, local->tx_headroom);
1849 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1850 beacon->head_len);
1851
1852 /*
1853 * Not very nice, but we want to allow the driver to call
1854 * ieee80211_beacon_get() as a response to the set_tim()
1855 * callback. That, however, is already invoked under the
1856 * sta_lock to guarantee consistent and race-free update
1857 * of the tim bitmap in mac80211 and the driver.
1858 */
1859 if (local->tim_in_locked_section) {
1860 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1861 } else {
1862 unsigned long flags;
1863
1864 spin_lock_irqsave(&local->sta_lock, flags);
1865 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1866 spin_unlock_irqrestore(&local->sta_lock, flags);
1867 }
1868
1869 if (beacon->tail)
1870 memcpy(skb_put(skb, beacon->tail_len),
1871 beacon->tail, beacon->tail_len);
1872
1873 num_beacons = &ap->num_beacons;
1874 } else
1875 goto out;
1876 } else if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1877 struct ieee80211_hdr *hdr;
1878 ifsta = &sdata->u.sta;
1879
1880 if (!ifsta->probe_resp)
1881 goto out;
1882
1883 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1884 if (!skb)
1885 goto out;
1886
1887 hdr = (struct ieee80211_hdr *) skb->data;
1888 hdr->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1889 IEEE80211_STYPE_BEACON);
1890
1891 num_beacons = &ifsta->num_beacons;
1892 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1893 /* headroom, head length, tail length and maximum TIM length */
1894 skb = dev_alloc_skb(local->tx_headroom + 400);
1895 if (!skb)
1896 goto out;
1897
1898 skb_reserve(skb, local->hw.extra_tx_headroom);
1899 mgmt = (struct ieee80211_mgmt *)
1900 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1901 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1902 mgmt->frame_control =
1903 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1904 memset(mgmt->da, 0xff, ETH_ALEN);
1905 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1906 /* BSSID is left zeroed, wildcard value */
1907 mgmt->u.beacon.beacon_int =
1908 cpu_to_le16(local->hw.conf.beacon_int);
1909 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1910
1911 pos = skb_put(skb, 2);
1912 *pos++ = WLAN_EID_SSID;
1913 *pos++ = 0x0;
1914
1915 mesh_mgmt_ies_add(skb, sdata->dev);
1916
1917 num_beacons = &sdata->u.sta.num_beacons;
1918 } else {
1919 WARN_ON(1);
1920 goto out;
1921 }
1922
1923 info = IEEE80211_SKB_CB(skb);
1924
1925 info->band = band;
1926 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1927
1928 if (unlikely(rsel.rate_idx < 0)) {
1929 if (net_ratelimit()) {
1930 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1931 "no rate found\n",
1932 wiphy_name(local->hw.wiphy));
1933 }
1934 dev_kfree_skb(skb);
1935 skb = NULL;
1936 goto out;
1937 }
1938
1939 info->control.vif = vif;
1940 info->tx_rate_idx = rsel.rate_idx;
1941
1942 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1943 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
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);
Support for the Chinese Samsung S3C2440 based development boards