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mac80211: tx.c use new frame control helpers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / tx.c
blobbf3600a047763baebd3ef7f7ca9c0657b6f81639
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "led.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "wpa.h"
32 #include "wme.h"
33 #include "rate.h"
34
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
38
39 /* misc utils */
40
41 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
42 struct ieee80211_hdr *hdr)
43 {
44 /* Set the sequence number for this frame. */
45 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
46
47 /* Increase the sequence number. */
48 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
49 }
50
51 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
52 static void ieee80211_dump_frame(const char *ifname, const char *title,
53 const struct sk_buff *skb)
54 {
55 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
56 unsigned int hdrlen;
57 DECLARE_MAC_BUF(mac);
58
59 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
60 if (skb->len < 4) {
61 printk("\n");
62 return;
63 }
64
65 hdrlen = ieee80211_hdrlen(hdr->frame_control);
66 if (hdrlen > skb->len)
67 hdrlen = skb->len;
68 if (hdrlen >= 4)
69 printk(" FC=0x%04x DUR=0x%04x",
70 le16_to_cpu(hdr->frame_control), le16_to_cpu(hdr->duration_id));
71 if (hdrlen >= 10)
72 printk(" A1=%s", print_mac(mac, hdr->addr1));
73 if (hdrlen >= 16)
74 printk(" A2=%s", print_mac(mac, hdr->addr2));
75 if (hdrlen >= 24)
76 printk(" A3=%s", print_mac(mac, hdr->addr3));
77 if (hdrlen >= 30)
78 printk(" A4=%s", print_mac(mac, hdr->addr4));
79 printk("\n");
80 }
81 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
82 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
83 struct sk_buff *skb)
84 {
85 }
86 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
87
88 static u16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
89 int next_frag_len)
90 {
91 int rate, mrate, erp, dur, i;
92 struct ieee80211_rate *txrate;
93 struct ieee80211_local *local = tx->local;
94 struct ieee80211_supported_band *sband;
95
96 sband = local->hw.wiphy->bands[tx->channel->band];
97 txrate = &sband->bitrates[tx->rate_idx];
98
99 erp = 0;
100 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
101 erp = txrate->flags & IEEE80211_RATE_ERP_G;
102
103 /*
104 * data and mgmt (except PS Poll):
105 * - during CFP: 32768
106 * - during contention period:
107 * if addr1 is group address: 0
108 * if more fragments = 0 and addr1 is individual address: time to
109 * transmit one ACK plus SIFS
110 * if more fragments = 1 and addr1 is individual address: time to
111 * transmit next fragment plus 2 x ACK plus 3 x SIFS
112 *
113 * IEEE 802.11, 9.6:
114 * - control response frame (CTS or ACK) shall be transmitted using the
115 * same rate as the immediately previous frame in the frame exchange
116 * sequence, if this rate belongs to the PHY mandatory rates, or else
117 * at the highest possible rate belonging to the PHY rates in the
118 * BSSBasicRateSet
119 */
120
121 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
122 /* TODO: These control frames are not currently sent by
123 * 80211.o, but should they be implemented, this function
124 * needs to be updated to support duration field calculation.
125 *
126 * RTS: time needed to transmit pending data/mgmt frame plus
127 * one CTS frame plus one ACK frame plus 3 x SIFS
128 * CTS: duration of immediately previous RTS minus time
129 * required to transmit CTS and its SIFS
130 * ACK: 0 if immediately previous directed data/mgmt had
131 * more=0, with more=1 duration in ACK frame is duration
132 * from previous frame minus time needed to transmit ACK
133 * and its SIFS
134 * PS Poll: BIT(15) | BIT(14) | aid
135 */
136 return 0;
137 }
138
139 /* data/mgmt */
140 if (0 /* FIX: data/mgmt during CFP */)
141 return 32768;
142
143 if (group_addr) /* Group address as the destination - no ACK */
144 return 0;
145
146 /* Individual destination address:
147 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
148 * CTS and ACK frames shall be transmitted using the highest rate in
149 * basic rate set that is less than or equal to the rate of the
150 * immediately previous frame and that is using the same modulation
151 * (CCK or OFDM). If no basic rate set matches with these requirements,
152 * the highest mandatory rate of the PHY that is less than or equal to
153 * the rate of the previous frame is used.
154 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
155 */
156 rate = -1;
157 /* use lowest available if everything fails */
158 mrate = sband->bitrates[0].bitrate;
159 for (i = 0; i < sband->n_bitrates; i++) {
160 struct ieee80211_rate *r = &sband->bitrates[i];
161
162 if (r->bitrate > txrate->bitrate)
163 break;
164
165 if (tx->sdata->basic_rates & BIT(i))
166 rate = r->bitrate;
167
168 switch (sband->band) {
169 case IEEE80211_BAND_2GHZ: {
170 u32 flag;
171 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
172 flag = IEEE80211_RATE_MANDATORY_G;
173 else
174 flag = IEEE80211_RATE_MANDATORY_B;
175 if (r->flags & flag)
176 mrate = r->bitrate;
177 break;
178 }
179 case IEEE80211_BAND_5GHZ:
180 if (r->flags & IEEE80211_RATE_MANDATORY_A)
181 mrate = r->bitrate;
182 break;
183 case IEEE80211_NUM_BANDS:
184 WARN_ON(1);
185 break;
186 }
187 }
188 if (rate == -1) {
189 /* No matching basic rate found; use highest suitable mandatory
190 * PHY rate */
191 rate = mrate;
192 }
193
194 /* Time needed to transmit ACK
195 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
196 * to closest integer */
197
198 dur = ieee80211_frame_duration(local, 10, rate, erp,
199 tx->sdata->bss_conf.use_short_preamble);
200
201 if (next_frag_len) {
202 /* Frame is fragmented: duration increases with time needed to
203 * transmit next fragment plus ACK and 2 x SIFS. */
204 dur *= 2; /* ACK + SIFS */
205 /* next fragment */
206 dur += ieee80211_frame_duration(local, next_frag_len,
207 txrate->bitrate, erp,
208 tx->sdata->bss_conf.use_short_preamble);
209 }
210
211 return dur;
212 }
213
214 static int inline is_ieee80211_device(struct net_device *dev,
215 struct net_device *master)
216 {
217 return (wdev_priv(dev->ieee80211_ptr) ==
218 wdev_priv(master->ieee80211_ptr));
219 }
220
221 /* tx handlers */
222
223 static ieee80211_tx_result
224 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
225 {
226 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
227 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
228 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
229 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
230 u32 sta_flags;
231
232 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
233 return TX_CONTINUE;
234
235 if (unlikely(tx->local->sta_sw_scanning) &&
236 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
237 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
238 return TX_DROP;
239
240 if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT)
241 return TX_CONTINUE;
242
243 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
244 return TX_CONTINUE;
245
246 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
247
248 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
249 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
250 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
251 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
252 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
253 DECLARE_MAC_BUF(mac);
254 printk(KERN_DEBUG "%s: dropped data frame to not "
255 "associated station %s\n",
256 tx->dev->name, print_mac(mac, hdr->addr1));
257 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
258 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
259 return TX_DROP;
260 }
261 } else {
262 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
263 tx->local->num_sta == 0 &&
264 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
265 /*
266 * No associated STAs - no need to send multicast
267 * frames.
268 */
269 return TX_DROP;
270 }
271 return TX_CONTINUE;
272 }
273
274 return TX_CONTINUE;
275 }
276
277 static ieee80211_tx_result
278 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
279 {
280 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
281
282 if (ieee80211_hdrlen(hdr->frame_control) >= 24)
283 ieee80211_include_sequence(tx->sdata, hdr);
284
285 return TX_CONTINUE;
286 }
287
288 /* This function is called whenever the AP is about to exceed the maximum limit
289 * of buffered frames for power saving STAs. This situation should not really
290 * happen often during normal operation, so dropping the oldest buffered packet
291 * from each queue should be OK to make some room for new frames. */
292 static void purge_old_ps_buffers(struct ieee80211_local *local)
293 {
294 int total = 0, purged = 0;
295 struct sk_buff *skb;
296 struct ieee80211_sub_if_data *sdata;
297 struct sta_info *sta;
298
299 /*
300 * virtual interfaces are protected by RCU
301 */
302 rcu_read_lock();
303
304 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
305 struct ieee80211_if_ap *ap;
306 if (sdata->dev == local->mdev ||
307 sdata->vif.type != IEEE80211_IF_TYPE_AP)
308 continue;
309 ap = &sdata->u.ap;
310 skb = skb_dequeue(&ap->ps_bc_buf);
311 if (skb) {
312 purged++;
313 dev_kfree_skb(skb);
314 }
315 total += skb_queue_len(&ap->ps_bc_buf);
316 }
317
318 list_for_each_entry_rcu(sta, &local->sta_list, list) {
319 skb = skb_dequeue(&sta->ps_tx_buf);
320 if (skb) {
321 purged++;
322 dev_kfree_skb(skb);
323 }
324 total += skb_queue_len(&sta->ps_tx_buf);
325 }
326
327 rcu_read_unlock();
328
329 local->total_ps_buffered = total;
330 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
331 wiphy_name(local->hw.wiphy), purged);
332 }
333
334 static ieee80211_tx_result
335 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
336 {
337 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
338
339 /*
340 * broadcast/multicast frame
341 *
342 * If any of the associated stations is in power save mode,
343 * the frame is buffered to be sent after DTIM beacon frame.
344 * This is done either by the hardware or us.
345 */
346
347 /* not AP/IBSS or ordered frame */
348 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
349 return TX_CONTINUE;
350
351 /* no stations in PS mode */
352 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
353 return TX_CONTINUE;
354
355 /* buffered in mac80211 */
356 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
357 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
358 purge_old_ps_buffers(tx->local);
359 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
360 AP_MAX_BC_BUFFER) {
361 if (net_ratelimit()) {
362 printk(KERN_DEBUG "%s: BC TX buffer full - "
363 "dropping the oldest frame\n",
364 tx->dev->name);
365 }
366 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
367 } else
368 tx->local->total_ps_buffered++;
369 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
370 return TX_QUEUED;
371 }
372
373 /* buffered in hardware */
374 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
375
376 return TX_CONTINUE;
377 }
378
379 static ieee80211_tx_result
380 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
381 {
382 struct sta_info *sta = tx->sta;
383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
384 u32 staflags;
385 DECLARE_MAC_BUF(mac);
386
387 if (unlikely(!sta ||
388 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
389 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
390 return TX_CONTINUE;
391
392 staflags = get_sta_flags(sta);
393
394 if (unlikely((staflags & WLAN_STA_PS) &&
395 !(staflags & WLAN_STA_PSPOLL))) {
396 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
397 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
398 "before %d)\n",
399 print_mac(mac, sta->addr), sta->aid,
400 skb_queue_len(&sta->ps_tx_buf));
401 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
402 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
403 purge_old_ps_buffers(tx->local);
404 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
405 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
406 if (net_ratelimit()) {
407 printk(KERN_DEBUG "%s: STA %s TX "
408 "buffer full - dropping oldest frame\n",
409 tx->dev->name, print_mac(mac, sta->addr));
410 }
411 dev_kfree_skb(old);
412 } else
413 tx->local->total_ps_buffered++;
414
415 /* Queue frame to be sent after STA sends an PS Poll frame */
416 if (skb_queue_empty(&sta->ps_tx_buf))
417 sta_info_set_tim_bit(sta);
418
419 info->control.jiffies = jiffies;
420 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
421 return TX_QUEUED;
422 }
423 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
424 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
425 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
426 "set -> send frame\n", tx->dev->name,
427 print_mac(mac, sta->addr));
428 }
429 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
430 clear_sta_flags(sta, WLAN_STA_PSPOLL);
431
432 return TX_CONTINUE;
433 }
434
435 static ieee80211_tx_result
436 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
437 {
438 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
439 return TX_CONTINUE;
440
441 if (tx->flags & IEEE80211_TX_UNICAST)
442 return ieee80211_tx_h_unicast_ps_buf(tx);
443 else
444 return ieee80211_tx_h_multicast_ps_buf(tx);
445 }
446
447 static ieee80211_tx_result
448 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
449 {
450 struct ieee80211_key *key;
451 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
452 u16 fc = tx->fc;
453
454 if (unlikely(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT))
455 tx->key = NULL;
456 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
457 tx->key = key;
458 else if ((key = rcu_dereference(tx->sdata->default_key)))
459 tx->key = key;
460 else if (tx->sdata->drop_unencrypted &&
461 !(info->flags & IEEE80211_TX_CTL_EAPOL_FRAME) &&
462 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
463 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
464 return TX_DROP;
465 } else
466 tx->key = NULL;
467
468 if (tx->key) {
469 u16 ftype, stype;
470
471 tx->key->tx_rx_count++;
472 /* TODO: add threshold stuff again */
473
474 switch (tx->key->conf.alg) {
475 case ALG_WEP:
476 ftype = fc & IEEE80211_FCTL_FTYPE;
477 stype = fc & IEEE80211_FCTL_STYPE;
478
479 if (ftype == IEEE80211_FTYPE_MGMT &&
480 stype == IEEE80211_STYPE_AUTH)
481 break;
482 case ALG_TKIP:
483 case ALG_CCMP:
484 if (!WLAN_FC_DATA_PRESENT(fc))
485 tx->key = NULL;
486 break;
487 }
488 }
489
490 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
491 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
492
493 return TX_CONTINUE;
494 }
495
496 static ieee80211_tx_result
497 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
498 {
499 struct rate_selection rsel;
500 struct ieee80211_supported_band *sband;
501 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
502
503 sband = tx->local->hw.wiphy->bands[tx->channel->band];
504
505 if (likely(tx->rate_idx < 0)) {
506 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
507 tx->rate_idx = rsel.rate_idx;
508 if (unlikely(rsel.probe_idx >= 0)) {
509 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
510 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
511 info->control.alt_retry_rate_idx = tx->rate_idx;
512 tx->rate_idx = rsel.probe_idx;
513 } else
514 info->control.alt_retry_rate_idx = -1;
515
516 if (unlikely(tx->rate_idx < 0))
517 return TX_DROP;
518 } else
519 info->control.alt_retry_rate_idx = -1;
520
521 if (tx->sdata->bss_conf.use_cts_prot &&
522 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
523 tx->last_frag_rate_idx = tx->rate_idx;
524 if (rsel.probe_idx >= 0)
525 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
526 else
527 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
528 tx->rate_idx = rsel.nonerp_idx;
529 info->tx_rate_idx = rsel.nonerp_idx;
530 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
531 } else {
532 tx->last_frag_rate_idx = tx->rate_idx;
533 info->tx_rate_idx = tx->rate_idx;
534 }
535 info->tx_rate_idx = tx->rate_idx;
536
537 return TX_CONTINUE;
538 }
539
540 static ieee80211_tx_result
541 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
542 {
543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
544 u16 dur;
545 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
546 struct ieee80211_supported_band *sband;
547
548 sband = tx->local->hw.wiphy->bands[tx->channel->band];
549
550 if (tx->sta)
551 info->control.aid = tx->sta->aid;
552
553 if (!info->control.retry_limit) {
554 if (!is_multicast_ether_addr(hdr->addr1)) {
555 int len = min_t(int, tx->skb->len + FCS_LEN,
556 tx->local->fragmentation_threshold);
557 if (len > tx->local->rts_threshold
558 && tx->local->rts_threshold <
559 IEEE80211_MAX_RTS_THRESHOLD) {
560 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
561 info->flags |=
562 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
563 info->control.retry_limit =
564 tx->local->long_retry_limit;
565 } else {
566 info->control.retry_limit =
567 tx->local->short_retry_limit;
568 }
569 } else {
570 info->control.retry_limit = 1;
571 }
572 }
573
574 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
575 /* Do not use multiple retry rates when sending fragmented
576 * frames.
577 * TODO: The last fragment could still use multiple retry
578 * rates. */
579 info->control.alt_retry_rate_idx = -1;
580 }
581
582 /* Use CTS protection for unicast frames sent using extended rates if
583 * there are associated non-ERP stations and RTS/CTS is not configured
584 * for the frame. */
585 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
586 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
587 (tx->flags & IEEE80211_TX_UNICAST) &&
588 tx->sdata->bss_conf.use_cts_prot &&
589 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
590 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
591
592 /* Transmit data frames using short preambles if the driver supports
593 * short preambles at the selected rate and short preambles are
594 * available on the network at the current point in time. */
595 if (ieee80211_is_data(hdr->frame_control) &&
596 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
597 tx->sdata->bss_conf.use_short_preamble &&
598 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
599 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
600 }
601
602 /* Setup duration field for the first fragment of the frame. Duration
603 * for remaining fragments will be updated when they are being sent
604 * to low-level driver in ieee80211_tx(). */
605 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
606 (tx->flags & IEEE80211_TX_FRAGMENTED) ?
607 tx->extra_frag[0]->len : 0);
608 hdr->duration_id = cpu_to_le16(dur);
609
610 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
611 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
612 struct ieee80211_rate *rate;
613 s8 baserate = -1;
614 int idx;
615
616 /* Do not use multiple retry rates when using RTS/CTS */
617 info->control.alt_retry_rate_idx = -1;
618
619 /* Use min(data rate, max base rate) as CTS/RTS rate */
620 rate = &sband->bitrates[tx->rate_idx];
621
622 for (idx = 0; idx < sband->n_bitrates; idx++) {
623 if (sband->bitrates[idx].bitrate > rate->bitrate)
624 continue;
625 if (tx->sdata->basic_rates & BIT(idx) &&
626 (baserate < 0 ||
627 (sband->bitrates[baserate].bitrate
628 < sband->bitrates[idx].bitrate)))
629 baserate = idx;
630 }
631
632 if (baserate >= 0)
633 info->control.rts_cts_rate_idx = baserate;
634 else
635 info->control.rts_cts_rate_idx = 0;
636 }
637
638 if (tx->sta)
639 info->control.aid = tx->sta->aid;
640
641 return TX_CONTINUE;
642 }
643
644 static ieee80211_tx_result
645 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
646 {
647 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
648 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
649 struct sk_buff **frags, *first, *frag;
650 int i;
651 u16 seq;
652 u8 *pos;
653 int frag_threshold = tx->local->fragmentation_threshold;
654
655 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
656 return TX_CONTINUE;
657
658 /*
659 * Warn when submitting a fragmented A-MPDU frame and drop it.
660 * This scenario is handled in __ieee80211_tx_prepare but extra
661 * caution taken here as fragmented ampdu may cause Tx stop.
662 */
663 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
664 skb_get_queue_mapping(tx->skb) >=
665 ieee80211_num_regular_queues(&tx->local->hw)))
666 return TX_DROP;
667
668 first = tx->skb;
669
670 hdrlen = ieee80211_hdrlen(hdr->frame_control);
671 payload_len = first->len - hdrlen;
672 per_fragm = frag_threshold - hdrlen - FCS_LEN;
673 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
674
675 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
676 if (!frags)
677 goto fail;
678
679 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
680 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
681 pos = first->data + hdrlen + per_fragm;
682 left = payload_len - per_fragm;
683 for (i = 0; i < num_fragm - 1; i++) {
684 struct ieee80211_hdr *fhdr;
685 size_t copylen;
686
687 if (left <= 0)
688 goto fail;
689
690 /* reserve enough extra head and tail room for possible
691 * encryption */
692 frag = frags[i] =
693 dev_alloc_skb(tx->local->tx_headroom +
694 frag_threshold +
695 IEEE80211_ENCRYPT_HEADROOM +
696 IEEE80211_ENCRYPT_TAILROOM);
697 if (!frag)
698 goto fail;
699 /* Make sure that all fragments use the same priority so
700 * that they end up using the same TX queue */
701 frag->priority = first->priority;
702 skb_reserve(frag, tx->local->tx_headroom +
703 IEEE80211_ENCRYPT_HEADROOM);
704 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
705 memcpy(fhdr, first->data, hdrlen);
706 if (i == num_fragm - 2)
707 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
708 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
709 copylen = left > per_fragm ? per_fragm : left;
710 memcpy(skb_put(frag, copylen), pos, copylen);
711
712 pos += copylen;
713 left -= copylen;
714 }
715 skb_trim(first, hdrlen + per_fragm);
716
717 tx->num_extra_frag = num_fragm - 1;
718 tx->extra_frag = frags;
719
720 return TX_CONTINUE;
721
722 fail:
723 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
724 if (frags) {
725 for (i = 0; i < num_fragm - 1; i++)
726 if (frags[i])
727 dev_kfree_skb(frags[i]);
728 kfree(frags);
729 }
730 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
731 return TX_DROP;
732 }
733
734 static ieee80211_tx_result
735 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
736 {
737 if (!tx->key)
738 return TX_CONTINUE;
739
740 switch (tx->key->conf.alg) {
741 case ALG_WEP:
742 return ieee80211_crypto_wep_encrypt(tx);
743 case ALG_TKIP:
744 return ieee80211_crypto_tkip_encrypt(tx);
745 case ALG_CCMP:
746 return ieee80211_crypto_ccmp_encrypt(tx);
747 }
748
749 /* not reached */
750 WARN_ON(1);
751 return TX_DROP;
752 }
753
754 static ieee80211_tx_result
755 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
756 {
757 int i;
758
759 if (!tx->sta)
760 return TX_CONTINUE;
761
762 tx->sta->tx_packets++;
763 tx->sta->tx_fragments++;
764 tx->sta->tx_bytes += tx->skb->len;
765 if (tx->extra_frag) {
766 tx->sta->tx_fragments += tx->num_extra_frag;
767 for (i = 0; i < tx->num_extra_frag; i++)
768 tx->sta->tx_bytes += tx->extra_frag[i]->len;
769 }
770
771 return TX_CONTINUE;
772 }
773
774
775 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *);
776 static ieee80211_tx_handler ieee80211_tx_handlers[] =
777 {
778 ieee80211_tx_h_check_assoc,
779 ieee80211_tx_h_sequence,
780 ieee80211_tx_h_ps_buf,
781 ieee80211_tx_h_select_key,
782 ieee80211_tx_h_michael_mic_add,
783 ieee80211_tx_h_rate_ctrl,
784 ieee80211_tx_h_misc,
785 ieee80211_tx_h_fragment,
786 /* handlers after fragment must be aware of tx info fragmentation! */
787 ieee80211_tx_h_encrypt,
788 ieee80211_tx_h_stats,
789 NULL
790 };
791
792 /* actual transmit path */
793
794 /*
795 * deal with packet injection down monitor interface
796 * with Radiotap Header -- only called for monitor mode interface
797 */
798 static ieee80211_tx_result
799 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
800 struct sk_buff *skb)
801 {
802 /*
803 * this is the moment to interpret and discard the radiotap header that
804 * must be at the start of the packet injected in Monitor mode
805 *
806 * Need to take some care with endian-ness since radiotap
807 * args are little-endian
808 */
809
810 struct ieee80211_radiotap_iterator iterator;
811 struct ieee80211_radiotap_header *rthdr =
812 (struct ieee80211_radiotap_header *) skb->data;
813 struct ieee80211_supported_band *sband;
814 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
815 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
816
817 sband = tx->local->hw.wiphy->bands[tx->channel->band];
818
819 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
820 info->flags |= IEEE80211_TX_CTL_INJECTED;
821 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
822
823 /*
824 * for every radiotap entry that is present
825 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
826 * entries present, or -EINVAL on error)
827 */
828
829 while (!ret) {
830 int i, target_rate;
831
832 ret = ieee80211_radiotap_iterator_next(&iterator);
833
834 if (ret)
835 continue;
836
837 /* see if this argument is something we can use */
838 switch (iterator.this_arg_index) {
839 /*
840 * You must take care when dereferencing iterator.this_arg
841 * for multibyte types... the pointer is not aligned. Use
842 * get_unaligned((type *)iterator.this_arg) to dereference
843 * iterator.this_arg for type "type" safely on all arches.
844 */
845 case IEEE80211_RADIOTAP_RATE:
846 /*
847 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
848 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
849 */
850 target_rate = (*iterator.this_arg) * 5;
851 for (i = 0; i < sband->n_bitrates; i++) {
852 struct ieee80211_rate *r;
853
854 r = &sband->bitrates[i];
855
856 if (r->bitrate == target_rate) {
857 tx->rate_idx = i;
858 break;
859 }
860 }
861 break;
862
863 case IEEE80211_RADIOTAP_ANTENNA:
864 /*
865 * radiotap uses 0 for 1st ant, mac80211 is 1 for
866 * 1st ant
867 */
868 info->antenna_sel_tx = (*iterator.this_arg) + 1;
869 break;
870
871 #if 0
872 case IEEE80211_RADIOTAP_DBM_TX_POWER:
873 control->power_level = *iterator.this_arg;
874 break;
875 #endif
876
877 case IEEE80211_RADIOTAP_FLAGS:
878 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
879 /*
880 * this indicates that the skb we have been
881 * handed has the 32-bit FCS CRC at the end...
882 * we should react to that by snipping it off
883 * because it will be recomputed and added
884 * on transmission
885 */
886 if (skb->len < (iterator.max_length + FCS_LEN))
887 return TX_DROP;
888
889 skb_trim(skb, skb->len - FCS_LEN);
890 }
891 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
892 info->flags &=
893 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
894 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
895 tx->flags |= IEEE80211_TX_FRAGMENTED;
896 break;
897
898 /*
899 * Please update the file
900 * Documentation/networking/mac80211-injection.txt
901 * when parsing new fields here.
902 */
903
904 default:
905 break;
906 }
907 }
908
909 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
910 return TX_DROP;
911
912 /*
913 * remove the radiotap header
914 * iterator->max_length was sanity-checked against
915 * skb->len by iterator init
916 */
917 skb_pull(skb, iterator.max_length);
918
919 return TX_CONTINUE;
920 }
921
922 /*
923 * initialises @tx
924 */
925 static ieee80211_tx_result
926 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
927 struct sk_buff *skb,
928 struct net_device *dev)
929 {
930 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
931 struct ieee80211_hdr *hdr;
932 struct ieee80211_sub_if_data *sdata;
933 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
934
935 int hdrlen;
936
937 memset(tx, 0, sizeof(*tx));
938 tx->skb = skb;
939 tx->dev = dev; /* use original interface */
940 tx->local = local;
941 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
942 tx->channel = local->hw.conf.channel;
943 tx->rate_idx = -1;
944 tx->last_frag_rate_idx = -1;
945 /*
946 * Set this flag (used below to indicate "automatic fragmentation"),
947 * it will be cleared/left by radiotap as desired.
948 */
949 tx->flags |= IEEE80211_TX_FRAGMENTED;
950
951 /* process and remove the injection radiotap header */
952 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
953 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
954 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
955 return TX_DROP;
956
957 /*
958 * __ieee80211_parse_tx_radiotap has now removed
959 * the radiotap header that was present and pre-filled
960 * 'tx' with tx control information.
961 */
962 }
963
964 hdr = (struct ieee80211_hdr *) skb->data;
965
966 tx->sta = sta_info_get(local, hdr->addr1);
967 tx->fc = le16_to_cpu(hdr->frame_control);
968
969 if (is_multicast_ether_addr(hdr->addr1)) {
970 tx->flags &= ~IEEE80211_TX_UNICAST;
971 info->flags |= IEEE80211_TX_CTL_NO_ACK;
972 } else {
973 tx->flags |= IEEE80211_TX_UNICAST;
974 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
975 }
976
977 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
978 if ((tx->flags & IEEE80211_TX_UNICAST) &&
979 skb->len + FCS_LEN > local->fragmentation_threshold &&
980 !local->ops->set_frag_threshold &&
981 !(info->flags & IEEE80211_TX_CTL_AMPDU))
982 tx->flags |= IEEE80211_TX_FRAGMENTED;
983 else
984 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
985 }
986
987 if (!tx->sta)
988 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
989 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
990 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
991
992 hdrlen = ieee80211_get_hdrlen(tx->fc);
993 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
994 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
995 tx->ethertype = (pos[0] << 8) | pos[1];
996 }
997 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
998
999 return TX_CONTINUE;
1000 }
1001
1002 /*
1003 * NB: @tx is uninitialised when passed in here
1004 */
1005 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1006 struct sk_buff *skb,
1007 struct net_device *mdev)
1008 {
1009 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1010 struct net_device *dev;
1011
1012 dev = dev_get_by_index(&init_net, info->control.ifindex);
1013 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1014 dev_put(dev);
1015 dev = NULL;
1016 }
1017 if (unlikely(!dev))
1018 return -ENODEV;
1019 /* initialises tx with control */
1020 __ieee80211_tx_prepare(tx, skb, dev);
1021 dev_put(dev);
1022 return 0;
1023 }
1024
1025 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1026 struct ieee80211_tx_data *tx)
1027 {
1028 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1029 int ret, i;
1030
1031 if (netif_subqueue_stopped(local->mdev, skb))
1032 return IEEE80211_TX_AGAIN;
1033
1034 if (skb) {
1035 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1036 "TX to low-level driver", skb);
1037 ret = local->ops->tx(local_to_hw(local), skb);
1038 if (ret)
1039 return IEEE80211_TX_AGAIN;
1040 local->mdev->trans_start = jiffies;
1041 ieee80211_led_tx(local, 1);
1042 }
1043 if (tx->extra_frag) {
1044 for (i = 0; i < tx->num_extra_frag; i++) {
1045 if (!tx->extra_frag[i])
1046 continue;
1047 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1048 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1049 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1050 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1051 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1052 if (netif_subqueue_stopped(local->mdev,
1053 tx->extra_frag[i]))
1054 return IEEE80211_TX_FRAG_AGAIN;
1055 if (i == tx->num_extra_frag) {
1056 info->tx_rate_idx = tx->last_frag_rate_idx;
1057
1058 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1059 info->flags |=
1060 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1061 else
1062 info->flags &=
1063 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1064 }
1065
1066 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1067 "TX to low-level driver",
1068 tx->extra_frag[i]);
1069 ret = local->ops->tx(local_to_hw(local),
1070 tx->extra_frag[i]);
1071 if (ret)
1072 return IEEE80211_TX_FRAG_AGAIN;
1073 local->mdev->trans_start = jiffies;
1074 ieee80211_led_tx(local, 1);
1075 tx->extra_frag[i] = NULL;
1076 }
1077 kfree(tx->extra_frag);
1078 tx->extra_frag = NULL;
1079 }
1080 return IEEE80211_TX_OK;
1081 }
1082
1083 /*
1084 * Invoke TX handlers, return 0 on success and non-zero if the
1085 * frame was dropped or queued.
1086 */
1087 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1088 {
1089 struct ieee80211_local *local = tx->local;
1090 struct sk_buff *skb = tx->skb;
1091 ieee80211_tx_handler *handler;
1092 ieee80211_tx_result res = TX_DROP;
1093 int i;
1094
1095 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
1096 res = (*handler)(tx);
1097 if (res != TX_CONTINUE)
1098 break;
1099 }
1100
1101 if (unlikely(res == TX_DROP)) {
1102 I802_DEBUG_INC(local->tx_handlers_drop);
1103 dev_kfree_skb(skb);
1104 for (i = 0; i < tx->num_extra_frag; i++)
1105 if (tx->extra_frag[i])
1106 dev_kfree_skb(tx->extra_frag[i]);
1107 kfree(tx->extra_frag);
1108 return -1;
1109 } else if (unlikely(res == TX_QUEUED)) {
1110 I802_DEBUG_INC(local->tx_handlers_queued);
1111 return -1;
1112 }
1113
1114 return 0;
1115 }
1116
1117 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1118 {
1119 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1120 struct sta_info *sta;
1121 struct ieee80211_tx_data tx;
1122 ieee80211_tx_result res_prepare;
1123 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1124 int ret, i;
1125 u16 queue;
1126
1127 queue = skb_get_queue_mapping(skb);
1128
1129 WARN_ON(test_bit(queue, local->queues_pending));
1130
1131 if (unlikely(skb->len < 10)) {
1132 dev_kfree_skb(skb);
1133 return 0;
1134 }
1135
1136 rcu_read_lock();
1137
1138 /* initialises tx */
1139 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1140
1141 if (res_prepare == TX_DROP) {
1142 dev_kfree_skb(skb);
1143 rcu_read_unlock();
1144 return 0;
1145 }
1146
1147 sta = tx.sta;
1148 tx.channel = local->hw.conf.channel;
1149 info->band = tx.channel->band;
1150
1151 if (invoke_tx_handlers(&tx))
1152 goto out;
1153
1154 if (tx.extra_frag) {
1155 for (i = 0; i < tx.num_extra_frag; i++) {
1156 int next_len, dur;
1157 struct ieee80211_hdr *hdr =
1158 (struct ieee80211_hdr *)
1159 tx.extra_frag[i]->data;
1160
1161 if (i + 1 < tx.num_extra_frag) {
1162 next_len = tx.extra_frag[i + 1]->len;
1163 } else {
1164 next_len = 0;
1165 tx.rate_idx = tx.last_frag_rate_idx;
1166 }
1167 dur = ieee80211_duration(&tx, 0, next_len);
1168 hdr->duration_id = cpu_to_le16(dur);
1169 }
1170 }
1171
1172 retry:
1173 ret = __ieee80211_tx(local, skb, &tx);
1174 if (ret) {
1175 struct ieee80211_tx_stored_packet *store;
1176
1177 /*
1178 * Since there are no fragmented frames on A-MPDU
1179 * queues, there's no reason for a driver to reject
1180 * a frame there, warn and drop it.
1181 */
1182 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1183 goto drop;
1184
1185 store = &local->pending_packet[queue];
1186
1187 if (ret == IEEE80211_TX_FRAG_AGAIN)
1188 skb = NULL;
1189 set_bit(queue, local->queues_pending);
1190 smp_mb();
1191 /*
1192 * When the driver gets out of buffers during sending of
1193 * fragments and calls ieee80211_stop_queue, the netif
1194 * subqueue is stopped. There is, however, a small window
1195 * in which the PENDING bit is not yet set. If a buffer
1196 * gets available in that window (i.e. driver calls
1197 * ieee80211_wake_queue), we would end up with ieee80211_tx
1198 * called with the PENDING bit still set. Prevent this by
1199 * continuing transmitting here when that situation is
1200 * possible to have happened.
1201 */
1202 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1203 clear_bit(queue, local->queues_pending);
1204 goto retry;
1205 }
1206 store->skb = skb;
1207 store->extra_frag = tx.extra_frag;
1208 store->num_extra_frag = tx.num_extra_frag;
1209 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1210 store->last_frag_rate_ctrl_probe =
1211 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1212 }
1213 out:
1214 rcu_read_unlock();
1215 return 0;
1216
1217 drop:
1218 if (skb)
1219 dev_kfree_skb(skb);
1220 for (i = 0; i < tx.num_extra_frag; i++)
1221 if (tx.extra_frag[i])
1222 dev_kfree_skb(tx.extra_frag[i]);
1223 kfree(tx.extra_frag);
1224 rcu_read_unlock();
1225 return 0;
1226 }
1227
1228 /* device xmit handlers */
1229
1230 static int ieee80211_skb_resize(struct ieee80211_local *local,
1231 struct sk_buff *skb,
1232 int head_need, bool may_encrypt)
1233 {
1234 int tail_need = 0;
1235
1236 /*
1237 * This could be optimised, devices that do full hardware
1238 * crypto (including TKIP MMIC) need no tailroom... But we
1239 * have no drivers for such devices currently.
1240 */
1241 if (may_encrypt) {
1242 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1243 tail_need -= skb_tailroom(skb);
1244 tail_need = max_t(int, tail_need, 0);
1245 }
1246
1247 if (head_need || tail_need) {
1248 /* Sorry. Can't account for this any more */
1249 skb_orphan(skb);
1250 }
1251
1252 if (skb_header_cloned(skb))
1253 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1254 else
1255 I802_DEBUG_INC(local->tx_expand_skb_head);
1256
1257 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1258 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1259 wiphy_name(local->hw.wiphy));
1260 return -ENOMEM;
1261 }
1262
1263 /* update truesize too */
1264 skb->truesize += head_need + tail_need;
1265
1266 return 0;
1267 }
1268
1269 int ieee80211_master_start_xmit(struct sk_buff *skb,
1270 struct net_device *dev)
1271 {
1272 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1273 struct net_device *odev = NULL;
1274 struct ieee80211_sub_if_data *osdata;
1275 int headroom;
1276 bool may_encrypt;
1277 int ret;
1278
1279 if (info->control.ifindex)
1280 odev = dev_get_by_index(&init_net, info->control.ifindex);
1281 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1282 dev_put(odev);
1283 odev = NULL;
1284 }
1285 if (unlikely(!odev)) {
1286 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1287 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1288 "originating device\n", dev->name);
1289 #endif
1290 dev_kfree_skb(skb);
1291 return 0;
1292 }
1293
1294 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1295
1296 may_encrypt = !(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT);
1297
1298 headroom = osdata->local->tx_headroom;
1299 if (may_encrypt)
1300 headroom += IEEE80211_ENCRYPT_HEADROOM;
1301 headroom -= skb_headroom(skb);
1302 headroom = max_t(int, 0, headroom);
1303
1304 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1305 dev_kfree_skb(skb);
1306 dev_put(odev);
1307 return 0;
1308 }
1309
1310 info->control.vif = &osdata->vif;
1311 ret = ieee80211_tx(odev, skb);
1312 dev_put(odev);
1313
1314 return ret;
1315 }
1316
1317 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1318 struct net_device *dev)
1319 {
1320 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1321 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1322 struct ieee80211_radiotap_header *prthdr =
1323 (struct ieee80211_radiotap_header *)skb->data;
1324 u16 len_rthdr;
1325
1326 /* check for not even having the fixed radiotap header part */
1327 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1328 goto fail; /* too short to be possibly valid */
1329
1330 /* is it a header version we can trust to find length from? */
1331 if (unlikely(prthdr->it_version))
1332 goto fail; /* only version 0 is supported */
1333
1334 /* then there must be a radiotap header with a length we can use */
1335 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1336
1337 /* does the skb contain enough to deliver on the alleged length? */
1338 if (unlikely(skb->len < len_rthdr))
1339 goto fail; /* skb too short for claimed rt header extent */
1340
1341 skb->dev = local->mdev;
1342
1343 /* needed because we set skb device to master */
1344 info->control.ifindex = dev->ifindex;
1345
1346 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1347 /* Interfaces should always request a status report */
1348 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1349
1350 /*
1351 * fix up the pointers accounting for the radiotap
1352 * header still being in there. We are being given
1353 * a precooked IEEE80211 header so no need for
1354 * normal processing
1355 */
1356 skb_set_mac_header(skb, len_rthdr);
1357 /*
1358 * these are just fixed to the end of the rt area since we
1359 * don't have any better information and at this point, nobody cares
1360 */
1361 skb_set_network_header(skb, len_rthdr);
1362 skb_set_transport_header(skb, len_rthdr);
1363
1364 /* pass the radiotap header up to the next stage intact */
1365 dev_queue_xmit(skb);
1366 return NETDEV_TX_OK;
1367
1368 fail:
1369 dev_kfree_skb(skb);
1370 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1371 }
1372
1373 /**
1374 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1375 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1376 * @skb: packet to be sent
1377 * @dev: incoming interface
1378 *
1379 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1380 * not be freed, and caller is responsible for either retrying later or freeing
1381 * skb).
1382 *
1383 * This function takes in an Ethernet header and encapsulates it with suitable
1384 * IEEE 802.11 header based on which interface the packet is coming in. The
1385 * encapsulated packet will then be passed to master interface, wlan#.11, for
1386 * transmission (through low-level driver).
1387 */
1388 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1389 struct net_device *dev)
1390 {
1391 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1392 struct ieee80211_tx_info *info;
1393 struct ieee80211_sub_if_data *sdata;
1394 int ret = 1, head_need;
1395 u16 ethertype, hdrlen, meshhdrlen = 0;
1396 __le16 fc;
1397 struct ieee80211_hdr hdr;
1398 struct ieee80211s_hdr mesh_hdr;
1399 const u8 *encaps_data;
1400 int encaps_len, skip_header_bytes;
1401 int nh_pos, h_pos;
1402 struct sta_info *sta;
1403 u32 sta_flags = 0;
1404
1405 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1406 if (unlikely(skb->len < ETH_HLEN)) {
1407 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1408 dev->name, skb->len);
1409 ret = 0;
1410 goto fail;
1411 }
1412
1413 nh_pos = skb_network_header(skb) - skb->data;
1414 h_pos = skb_transport_header(skb) - skb->data;
1415
1416 /* convert Ethernet header to proper 802.11 header (based on
1417 * operation mode) */
1418 ethertype = (skb->data[12] << 8) | skb->data[13];
1419 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1420
1421 switch (sdata->vif.type) {
1422 case IEEE80211_IF_TYPE_AP:
1423 case IEEE80211_IF_TYPE_VLAN:
1424 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1425 /* DA BSSID SA */
1426 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1427 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1428 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1429 hdrlen = 24;
1430 break;
1431 case IEEE80211_IF_TYPE_WDS:
1432 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1433 /* RA TA DA SA */
1434 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1435 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1436 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1437 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1438 hdrlen = 30;
1439 break;
1440 #ifdef CONFIG_MAC80211_MESH
1441 case IEEE80211_IF_TYPE_MESH_POINT:
1442 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1443 /* RA TA DA SA */
1444 if (is_multicast_ether_addr(skb->data))
1445 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1446 else if (mesh_nexthop_lookup(hdr.addr1, skb, dev))
1447 return 0;
1448 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1449 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1450 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1451 if (skb->pkt_type == PACKET_OTHERHOST) {
1452 /* Forwarded frame, keep mesh ttl and seqnum */
1453 struct ieee80211s_hdr *prev_meshhdr;
1454 prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb);
1455 meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr);
1456 memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen);
1457 sdata->u.sta.mshstats.fwded_frames++;
1458 } else {
1459 if (!sdata->u.sta.mshcfg.dot11MeshTTL) {
1460 /* Do not send frames with mesh_ttl == 0 */
1461 sdata->u.sta.mshstats.dropped_frames_ttl++;
1462 ret = 0;
1463 goto fail;
1464 }
1465 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1466 sdata);
1467 }
1468 hdrlen = 30;
1469 break;
1470 #endif
1471 case IEEE80211_IF_TYPE_STA:
1472 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1473 /* BSSID SA DA */
1474 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1475 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1476 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1477 hdrlen = 24;
1478 break;
1479 case IEEE80211_IF_TYPE_IBSS:
1480 /* DA SA BSSID */
1481 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1482 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1483 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1484 hdrlen = 24;
1485 break;
1486 default:
1487 ret = 0;
1488 goto fail;
1489 }
1490
1491 /*
1492 * There's no need to try to look up the destination
1493 * if it is a multicast address (which can only happen
1494 * in AP mode)
1495 */
1496 if (!is_multicast_ether_addr(hdr.addr1)) {
1497 rcu_read_lock();
1498 sta = sta_info_get(local, hdr.addr1);
1499 if (sta)
1500 sta_flags = get_sta_flags(sta);
1501 rcu_read_unlock();
1502 }
1503
1504 /* receiver and we are QoS enabled, use a QoS type frame */
1505 if (sta_flags & WLAN_STA_WME &&
1506 ieee80211_num_regular_queues(&local->hw) >= 4) {
1507 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1508 hdrlen += 2;
1509 }
1510
1511 /*
1512 * Drop unicast frames to unauthorised stations unless they are
1513 * EAPOL frames from the local station.
1514 */
1515 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1516 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1517 !(ethertype == ETH_P_PAE &&
1518 compare_ether_addr(dev->dev_addr,
1519 skb->data + ETH_ALEN) == 0))) {
1520 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1521 DECLARE_MAC_BUF(mac);
1522
1523 if (net_ratelimit())
1524 printk(KERN_DEBUG "%s: dropped frame to %s"
1525 " (unauthorized port)\n", dev->name,
1526 print_mac(mac, hdr.addr1));
1527 #endif
1528
1529 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1530
1531 ret = 0;
1532 goto fail;
1533 }
1534
1535 hdr.frame_control = fc;
1536 hdr.duration_id = 0;
1537 hdr.seq_ctrl = 0;
1538
1539 skip_header_bytes = ETH_HLEN;
1540 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1541 encaps_data = bridge_tunnel_header;
1542 encaps_len = sizeof(bridge_tunnel_header);
1543 skip_header_bytes -= 2;
1544 } else if (ethertype >= 0x600) {
1545 encaps_data = rfc1042_header;
1546 encaps_len = sizeof(rfc1042_header);
1547 skip_header_bytes -= 2;
1548 } else {
1549 encaps_data = NULL;
1550 encaps_len = 0;
1551 }
1552
1553 skb_pull(skb, skip_header_bytes);
1554 nh_pos -= skip_header_bytes;
1555 h_pos -= skip_header_bytes;
1556
1557 /* TODO: implement support for fragments so that there is no need to
1558 * reallocate and copy payload; it might be enough to support one
1559 * extra fragment that would be copied in the beginning of the frame
1560 * data.. anyway, it would be nice to include this into skb structure
1561 * somehow
1562 *
1563 * There are few options for this:
1564 * use skb->cb as an extra space for 802.11 header
1565 * allocate new buffer if not enough headroom
1566 * make sure that there is enough headroom in every skb by increasing
1567 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1568 * alloc_skb() (net/core/skbuff.c)
1569 */
1570 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1571
1572 /*
1573 * So we need to modify the skb header and hence need a copy of
1574 * that. The head_need variable above doesn't, so far, include
1575 * the needed header space that we don't need right away. If we
1576 * can, then we don't reallocate right now but only after the
1577 * frame arrives at the master device (if it does...)
1578 *
1579 * If we cannot, however, then we will reallocate to include all
1580 * the ever needed space. Also, if we need to reallocate it anyway,
1581 * make it big enough for everything we may ever need.
1582 */
1583
1584 if (head_need > 0 || skb_cloned(skb)) {
1585 head_need += IEEE80211_ENCRYPT_HEADROOM;
1586 head_need += local->tx_headroom;
1587 head_need = max_t(int, 0, head_need);
1588 if (ieee80211_skb_resize(local, skb, head_need, true))
1589 goto fail;
1590 }
1591
1592 if (encaps_data) {
1593 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1594 nh_pos += encaps_len;
1595 h_pos += encaps_len;
1596 }
1597
1598 if (meshhdrlen > 0) {
1599 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1600 nh_pos += meshhdrlen;
1601 h_pos += meshhdrlen;
1602 }
1603
1604 if (ieee80211_is_data_qos(fc)) {
1605 __le16 *qos_control;
1606
1607 qos_control = (__le16*) skb_push(skb, 2);
1608 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1609 /*
1610 * Maybe we could actually set some fields here, for now just
1611 * initialise to zero to indicate no special operation.
1612 */
1613 *qos_control = 0;
1614 } else
1615 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1616
1617 nh_pos += hdrlen;
1618 h_pos += hdrlen;
1619
1620 info = IEEE80211_SKB_CB(skb);
1621 memset(info, 0, sizeof(*info));
1622 info->control.ifindex = dev->ifindex;
1623 if (ethertype == ETH_P_PAE)
1624 info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME;
1625
1626 /* Interfaces should always request a status report */
1627 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1628
1629 skb->dev = local->mdev;
1630 dev->stats.tx_packets++;
1631 dev->stats.tx_bytes += skb->len;
1632
1633 /* Update skb pointers to various headers since this modified frame
1634 * is going to go through Linux networking code that may potentially
1635 * need things like pointer to IP header. */
1636 skb_set_mac_header(skb, 0);
1637 skb_set_network_header(skb, nh_pos);
1638 skb_set_transport_header(skb, h_pos);
1639
1640 dev->trans_start = jiffies;
1641 dev_queue_xmit(skb);
1642
1643 return 0;
1644
1645 fail:
1646 if (!ret)
1647 dev_kfree_skb(skb);
1648
1649 return ret;
1650 }
1651
1652
1653 /*
1654 * ieee80211_clear_tx_pending may not be called in a context where
1655 * it is possible that it packets could come in again.
1656 */
1657 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1658 {
1659 int i, j;
1660 struct ieee80211_tx_stored_packet *store;
1661
1662 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1663 if (!test_bit(i, local->queues_pending))
1664 continue;
1665 store = &local->pending_packet[i];
1666 kfree_skb(store->skb);
1667 for (j = 0; j < store->num_extra_frag; j++)
1668 kfree_skb(store->extra_frag[j]);
1669 kfree(store->extra_frag);
1670 clear_bit(i, local->queues_pending);
1671 }
1672 }
1673
1674 /*
1675 * Transmit all pending packets. Called from tasklet, locks master device
1676 * TX lock so that no new packets can come in.
1677 */
1678 void ieee80211_tx_pending(unsigned long data)
1679 {
1680 struct ieee80211_local *local = (struct ieee80211_local *)data;
1681 struct net_device *dev = local->mdev;
1682 struct ieee80211_tx_stored_packet *store;
1683 struct ieee80211_tx_data tx;
1684 int i, ret;
1685
1686 netif_tx_lock_bh(dev);
1687 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1688 /* Check that this queue is ok */
1689 if (__netif_subqueue_stopped(local->mdev, i))
1690 continue;
1691
1692 if (!test_bit(i, local->queues_pending)) {
1693 ieee80211_wake_queue(&local->hw, i);
1694 continue;
1695 }
1696
1697 store = &local->pending_packet[i];
1698 tx.extra_frag = store->extra_frag;
1699 tx.num_extra_frag = store->num_extra_frag;
1700 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1701 tx.flags = 0;
1702 if (store->last_frag_rate_ctrl_probe)
1703 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1704 ret = __ieee80211_tx(local, store->skb, &tx);
1705 if (ret) {
1706 if (ret == IEEE80211_TX_FRAG_AGAIN)
1707 store->skb = NULL;
1708 } else {
1709 clear_bit(i, local->queues_pending);
1710 ieee80211_wake_queue(&local->hw, i);
1711 }
1712 }
1713 netif_tx_unlock_bh(dev);
1714 }
1715
1716 /* functions for drivers to get certain frames */
1717
1718 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1719 struct ieee80211_if_ap *bss,
1720 struct sk_buff *skb,
1721 struct beacon_data *beacon)
1722 {
1723 u8 *pos, *tim;
1724 int aid0 = 0;
1725 int i, have_bits = 0, n1, n2;
1726
1727 /* Generate bitmap for TIM only if there are any STAs in power save
1728 * mode. */
1729 if (atomic_read(&bss->num_sta_ps) > 0)
1730 /* in the hope that this is faster than
1731 * checking byte-for-byte */
1732 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1733 IEEE80211_MAX_AID+1);
1734
1735 if (bss->dtim_count == 0)
1736 bss->dtim_count = beacon->dtim_period - 1;
1737 else
1738 bss->dtim_count--;
1739
1740 tim = pos = (u8 *) skb_put(skb, 6);
1741 *pos++ = WLAN_EID_TIM;
1742 *pos++ = 4;
1743 *pos++ = bss->dtim_count;
1744 *pos++ = beacon->dtim_period;
1745
1746 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1747 aid0 = 1;
1748
1749 if (have_bits) {
1750 /* Find largest even number N1 so that bits numbered 1 through
1751 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1752 * (N2 + 1) x 8 through 2007 are 0. */
1753 n1 = 0;
1754 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1755 if (bss->tim[i]) {
1756 n1 = i & 0xfe;
1757 break;
1758 }
1759 }
1760 n2 = n1;
1761 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1762 if (bss->tim[i]) {
1763 n2 = i;
1764 break;
1765 }
1766 }
1767
1768 /* Bitmap control */
1769 *pos++ = n1 | aid0;
1770 /* Part Virt Bitmap */
1771 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1772
1773 tim[1] = n2 - n1 + 4;
1774 skb_put(skb, n2 - n1);
1775 } else {
1776 *pos++ = aid0; /* Bitmap control */
1777 *pos++ = 0; /* Part Virt Bitmap */
1778 }
1779 }
1780
1781 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1782 struct ieee80211_vif *vif)
1783 {
1784 struct ieee80211_local *local = hw_to_local(hw);
1785 struct sk_buff *skb;
1786 struct ieee80211_tx_info *info;
1787 struct net_device *bdev;
1788 struct ieee80211_sub_if_data *sdata = NULL;
1789 struct ieee80211_if_ap *ap = NULL;
1790 struct rate_selection rsel;
1791 struct beacon_data *beacon;
1792 struct ieee80211_supported_band *sband;
1793 struct ieee80211_mgmt *mgmt;
1794 int *num_beacons;
1795 bool err = true;
1796 enum ieee80211_band band = local->hw.conf.channel->band;
1797 u8 *pos;
1798
1799 sband = local->hw.wiphy->bands[band];
1800
1801 rcu_read_lock();
1802
1803 sdata = vif_to_sdata(vif);
1804 bdev = sdata->dev;
1805
1806 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1807 ap = &sdata->u.ap;
1808 beacon = rcu_dereference(ap->beacon);
1809 if (ap && beacon) {
1810 /*
1811 * headroom, head length,
1812 * tail length and maximum TIM length
1813 */
1814 skb = dev_alloc_skb(local->tx_headroom +
1815 beacon->head_len +
1816 beacon->tail_len + 256);
1817 if (!skb)
1818 goto out;
1819
1820 skb_reserve(skb, local->tx_headroom);
1821 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1822 beacon->head_len);
1823
1824 ieee80211_include_sequence(sdata,
1825 (struct ieee80211_hdr *)skb->data);
1826
1827 /*
1828 * Not very nice, but we want to allow the driver to call
1829 * ieee80211_beacon_get() as a response to the set_tim()
1830 * callback. That, however, is already invoked under the
1831 * sta_lock to guarantee consistent and race-free update
1832 * of the tim bitmap in mac80211 and the driver.
1833 */
1834 if (local->tim_in_locked_section) {
1835 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1836 } else {
1837 unsigned long flags;
1838
1839 spin_lock_irqsave(&local->sta_lock, flags);
1840 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1841 spin_unlock_irqrestore(&local->sta_lock, flags);
1842 }
1843
1844 if (beacon->tail)
1845 memcpy(skb_put(skb, beacon->tail_len),
1846 beacon->tail, beacon->tail_len);
1847
1848 num_beacons = &ap->num_beacons;
1849
1850 err = false;
1851 }
1852 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1853 /* headroom, head length, tail length and maximum TIM length */
1854 skb = dev_alloc_skb(local->tx_headroom + 400);
1855 if (!skb)
1856 goto out;
1857
1858 skb_reserve(skb, local->hw.extra_tx_headroom);
1859 mgmt = (struct ieee80211_mgmt *)
1860 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1861 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1862 mgmt->frame_control =
1863 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1864 memset(mgmt->da, 0xff, ETH_ALEN);
1865 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1866 /* BSSID is left zeroed, wildcard value */
1867 mgmt->u.beacon.beacon_int =
1868 cpu_to_le16(local->hw.conf.beacon_int);
1869 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1870
1871 pos = skb_put(skb, 2);
1872 *pos++ = WLAN_EID_SSID;
1873 *pos++ = 0x0;
1874
1875 mesh_mgmt_ies_add(skb, sdata->dev);
1876
1877 num_beacons = &sdata->u.sta.num_beacons;
1878
1879 err = false;
1880 }
1881
1882 if (err) {
1883 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1884 if (net_ratelimit())
1885 printk(KERN_DEBUG "no beacon data avail for %s\n",
1886 bdev->name);
1887 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1888 skb = NULL;
1889 goto out;
1890 }
1891
1892 info = IEEE80211_SKB_CB(skb);
1893
1894 info->band = band;
1895 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1896
1897 if (unlikely(rsel.rate_idx < 0)) {
1898 if (net_ratelimit()) {
1899 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1900 "no rate found\n",
1901 wiphy_name(local->hw.wiphy));
1902 }
1903 dev_kfree_skb(skb);
1904 skb = NULL;
1905 goto out;
1906 }
1907
1908 info->control.vif = vif;
1909 info->tx_rate_idx = rsel.rate_idx;
1910 if (sdata->bss_conf.use_short_preamble &&
1911 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1912 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1913 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1914 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1915 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1916 info->control.retry_limit = 1;
1917 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1918 (*num_beacons)++;
1919 out:
1920 rcu_read_unlock();
1921 return skb;
1922 }
1923 EXPORT_SYMBOL(ieee80211_beacon_get);
1924
1925 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1926 const void *frame, size_t frame_len,
1927 const struct ieee80211_tx_info *frame_txctl,
1928 struct ieee80211_rts *rts)
1929 {
1930 const struct ieee80211_hdr *hdr = frame;
1931
1932 rts->frame_control =
1933 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
1934 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1935 frame_txctl);
1936 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1937 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1938 }
1939 EXPORT_SYMBOL(ieee80211_rts_get);
1940
1941 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1942 const void *frame, size_t frame_len,
1943 const struct ieee80211_tx_info *frame_txctl,
1944 struct ieee80211_cts *cts)
1945 {
1946 const struct ieee80211_hdr *hdr = frame;
1947
1948 cts->frame_control =
1949 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
1950 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1951 frame_len, frame_txctl);
1952 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1953 }
1954 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1955
1956 struct sk_buff *
1957 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1958 struct ieee80211_vif *vif)
1959 {
1960 struct ieee80211_local *local = hw_to_local(hw);
1961 struct sk_buff *skb = NULL;
1962 struct sta_info *sta;
1963 struct ieee80211_tx_data tx;
1964 struct net_device *bdev;
1965 struct ieee80211_sub_if_data *sdata;
1966 struct ieee80211_if_ap *bss = NULL;
1967 struct beacon_data *beacon;
1968 struct ieee80211_tx_info *info;
1969
1970 sdata = vif_to_sdata(vif);
1971 bdev = sdata->dev;
1972 bss = &sdata->u.ap;
1973
1974 if (!bss)
1975 return NULL;
1976
1977 rcu_read_lock();
1978 beacon = rcu_dereference(bss->beacon);
1979
1980 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || !beacon->head)
1981 goto out;
1982
1983 if (bss->dtim_count != 0)
1984 goto out; /* send buffered bc/mc only after DTIM beacon */
1985
1986 while (1) {
1987 skb = skb_dequeue(&bss->ps_bc_buf);
1988 if (!skb)
1989 goto out;
1990 local->total_ps_buffered--;
1991
1992 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1993 struct ieee80211_hdr *hdr =
1994 (struct ieee80211_hdr *) skb->data;
1995 /* more buffered multicast/broadcast frames ==> set
1996 * MoreData flag in IEEE 802.11 header to inform PS
1997 * STAs */
1998 hdr->frame_control |=
1999 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2000 }
2001
2002 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2003 break;
2004 dev_kfree_skb_any(skb);
2005 }
2006
2007 info = IEEE80211_SKB_CB(skb);
2008
2009 sta = tx.sta;
2010 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2011 tx.channel = local->hw.conf.channel;
2012 info->band = tx.channel->band;
2013
2014 if (invoke_tx_handlers(&tx))
2015 skb = NULL;
2016 out:
2017 rcu_read_unlock();
2018
2019 return skb;
2020 }
2021 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree