mac80211: make retry limits part of hw config
[firewire-audio.git] / net / mac80211 / tx.c
blobdd440a07634e5f13b33182731e31410b5901a99e
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>
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.
12 * Transmit and frame generation functions.
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>
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"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
39 /* misc utils */
41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
42 int next_frag_len)
44 int rate, mrate, erp, dur, i;
45 struct ieee80211_rate *txrate;
46 struct ieee80211_local *local = tx->local;
47 struct ieee80211_supported_band *sband;
48 struct ieee80211_hdr *hdr;
50 sband = local->hw.wiphy->bands[tx->channel->band];
51 txrate = &sband->bitrates[tx->rate_idx];
53 erp = 0;
54 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
55 erp = txrate->flags & IEEE80211_RATE_ERP_G;
58 * data and mgmt (except PS Poll):
59 * - during CFP: 32768
60 * - during contention period:
61 * if addr1 is group address: 0
62 * if more fragments = 0 and addr1 is individual address: time to
63 * transmit one ACK plus SIFS
64 * if more fragments = 1 and addr1 is individual address: time to
65 * transmit next fragment plus 2 x ACK plus 3 x SIFS
67 * IEEE 802.11, 9.6:
68 * - control response frame (CTS or ACK) shall be transmitted using the
69 * same rate as the immediately previous frame in the frame exchange
70 * sequence, if this rate belongs to the PHY mandatory rates, or else
71 * at the highest possible rate belonging to the PHY rates in the
72 * BSSBasicRateSet
74 hdr = (struct ieee80211_hdr *)tx->skb->data;
75 if (ieee80211_is_ctl(hdr->frame_control)) {
76 /* TODO: These control frames are not currently sent by
77 * mac80211, but should they be implemented, this function
78 * needs to be updated to support duration field calculation.
80 * RTS: time needed to transmit pending data/mgmt frame plus
81 * one CTS frame plus one ACK frame plus 3 x SIFS
82 * CTS: duration of immediately previous RTS minus time
83 * required to transmit CTS and its SIFS
84 * ACK: 0 if immediately previous directed data/mgmt had
85 * more=0, with more=1 duration in ACK frame is duration
86 * from previous frame minus time needed to transmit ACK
87 * and its SIFS
88 * PS Poll: BIT(15) | BIT(14) | aid
90 return 0;
93 /* data/mgmt */
94 if (0 /* FIX: data/mgmt during CFP */)
95 return cpu_to_le16(32768);
97 if (group_addr) /* Group address as the destination - no ACK */
98 return 0;
100 /* Individual destination address:
101 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
102 * CTS and ACK frames shall be transmitted using the highest rate in
103 * basic rate set that is less than or equal to the rate of the
104 * immediately previous frame and that is using the same modulation
105 * (CCK or OFDM). If no basic rate set matches with these requirements,
106 * the highest mandatory rate of the PHY that is less than or equal to
107 * the rate of the previous frame is used.
108 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
110 rate = -1;
111 /* use lowest available if everything fails */
112 mrate = sband->bitrates[0].bitrate;
113 for (i = 0; i < sband->n_bitrates; i++) {
114 struct ieee80211_rate *r = &sband->bitrates[i];
116 if (r->bitrate > txrate->bitrate)
117 break;
119 if (tx->sdata->bss_conf.basic_rates & BIT(i))
120 rate = r->bitrate;
122 switch (sband->band) {
123 case IEEE80211_BAND_2GHZ: {
124 u32 flag;
125 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
126 flag = IEEE80211_RATE_MANDATORY_G;
127 else
128 flag = IEEE80211_RATE_MANDATORY_B;
129 if (r->flags & flag)
130 mrate = r->bitrate;
131 break;
133 case IEEE80211_BAND_5GHZ:
134 if (r->flags & IEEE80211_RATE_MANDATORY_A)
135 mrate = r->bitrate;
136 break;
137 case IEEE80211_NUM_BANDS:
138 WARN_ON(1);
139 break;
142 if (rate == -1) {
143 /* No matching basic rate found; use highest suitable mandatory
144 * PHY rate */
145 rate = mrate;
148 /* Time needed to transmit ACK
149 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
150 * to closest integer */
152 dur = ieee80211_frame_duration(local, 10, rate, erp,
153 tx->sdata->bss_conf.use_short_preamble);
155 if (next_frag_len) {
156 /* Frame is fragmented: duration increases with time needed to
157 * transmit next fragment plus ACK and 2 x SIFS. */
158 dur *= 2; /* ACK + SIFS */
159 /* next fragment */
160 dur += ieee80211_frame_duration(local, next_frag_len,
161 txrate->bitrate, erp,
162 tx->sdata->bss_conf.use_short_preamble);
165 return cpu_to_le16(dur);
168 static int inline is_ieee80211_device(struct ieee80211_local *local,
169 struct net_device *dev)
171 return local == wdev_priv(dev->ieee80211_ptr);
174 /* tx handlers */
176 static ieee80211_tx_result debug_noinline
177 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
180 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
182 u32 sta_flags;
184 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
185 return TX_CONTINUE;
187 if (unlikely(tx->local->sw_scanning) &&
188 !ieee80211_is_probe_req(hdr->frame_control))
189 return TX_DROP;
191 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
192 return TX_CONTINUE;
194 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
195 return TX_CONTINUE;
197 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
199 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
200 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
201 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
202 ieee80211_is_data(hdr->frame_control))) {
203 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
204 printk(KERN_DEBUG "%s: dropped data frame to not "
205 "associated station %pM\n",
206 tx->dev->name, hdr->addr1);
207 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
208 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
209 return TX_DROP;
211 } else {
212 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
213 tx->local->num_sta == 0 &&
214 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
216 * No associated STAs - no need to send multicast
217 * frames.
219 return TX_DROP;
221 return TX_CONTINUE;
224 return TX_CONTINUE;
227 /* This function is called whenever the AP is about to exceed the maximum limit
228 * of buffered frames for power saving STAs. This situation should not really
229 * happen often during normal operation, so dropping the oldest buffered packet
230 * from each queue should be OK to make some room for new frames. */
231 static void purge_old_ps_buffers(struct ieee80211_local *local)
233 int total = 0, purged = 0;
234 struct sk_buff *skb;
235 struct ieee80211_sub_if_data *sdata;
236 struct sta_info *sta;
239 * virtual interfaces are protected by RCU
241 rcu_read_lock();
243 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
244 struct ieee80211_if_ap *ap;
245 if (sdata->vif.type != NL80211_IFTYPE_AP)
246 continue;
247 ap = &sdata->u.ap;
248 skb = skb_dequeue(&ap->ps_bc_buf);
249 if (skb) {
250 purged++;
251 dev_kfree_skb(skb);
253 total += skb_queue_len(&ap->ps_bc_buf);
256 list_for_each_entry_rcu(sta, &local->sta_list, list) {
257 skb = skb_dequeue(&sta->ps_tx_buf);
258 if (skb) {
259 purged++;
260 dev_kfree_skb(skb);
262 total += skb_queue_len(&sta->ps_tx_buf);
265 rcu_read_unlock();
267 local->total_ps_buffered = total;
268 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
269 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
270 wiphy_name(local->hw.wiphy), purged);
271 #endif
274 static ieee80211_tx_result
275 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
277 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
278 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
281 * broadcast/multicast frame
283 * If any of the associated stations is in power save mode,
284 * the frame is buffered to be sent after DTIM beacon frame.
285 * This is done either by the hardware or us.
288 /* powersaving STAs only in AP/VLAN mode */
289 if (!tx->sdata->bss)
290 return TX_CONTINUE;
292 /* no buffering for ordered frames */
293 if (ieee80211_has_order(hdr->frame_control))
294 return TX_CONTINUE;
296 /* no stations in PS mode */
297 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
298 return TX_CONTINUE;
300 /* buffered in mac80211 */
301 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
302 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
303 purge_old_ps_buffers(tx->local);
304 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
305 AP_MAX_BC_BUFFER) {
306 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
307 if (net_ratelimit()) {
308 printk(KERN_DEBUG "%s: BC TX buffer full - "
309 "dropping the oldest frame\n",
310 tx->dev->name);
312 #endif
313 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
314 } else
315 tx->local->total_ps_buffered++;
316 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
317 return TX_QUEUED;
320 /* buffered in hardware */
321 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
323 return TX_CONTINUE;
326 static ieee80211_tx_result
327 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
329 struct sta_info *sta = tx->sta;
330 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
331 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
332 u32 staflags;
334 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
335 return TX_CONTINUE;
337 staflags = get_sta_flags(sta);
339 if (unlikely((staflags & WLAN_STA_PS) &&
340 !(staflags & WLAN_STA_PSPOLL))) {
341 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
342 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
343 "before %d)\n",
344 sta->sta.addr, sta->sta.aid,
345 skb_queue_len(&sta->ps_tx_buf));
346 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
347 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
348 purge_old_ps_buffers(tx->local);
349 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
350 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
351 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
352 if (net_ratelimit()) {
353 printk(KERN_DEBUG "%s: STA %pM TX "
354 "buffer full - dropping oldest frame\n",
355 tx->dev->name, sta->sta.addr);
357 #endif
358 dev_kfree_skb(old);
359 } else
360 tx->local->total_ps_buffered++;
362 /* Queue frame to be sent after STA sends an PS Poll frame */
363 if (skb_queue_empty(&sta->ps_tx_buf))
364 sta_info_set_tim_bit(sta);
366 info->control.jiffies = jiffies;
367 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
368 return TX_QUEUED;
370 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
371 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
372 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
373 "set -> send frame\n", tx->dev->name,
374 sta->sta.addr);
376 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
377 clear_sta_flags(sta, WLAN_STA_PSPOLL);
379 return TX_CONTINUE;
382 static ieee80211_tx_result debug_noinline
383 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
385 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
386 return TX_CONTINUE;
388 if (tx->flags & IEEE80211_TX_UNICAST)
389 return ieee80211_tx_h_unicast_ps_buf(tx);
390 else
391 return ieee80211_tx_h_multicast_ps_buf(tx);
394 static ieee80211_tx_result debug_noinline
395 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
397 struct ieee80211_key *key;
398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
401 if (unlikely(tx->skb->do_not_encrypt))
402 tx->key = NULL;
403 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
404 tx->key = key;
405 else if ((key = rcu_dereference(tx->sdata->default_key)))
406 tx->key = key;
407 else if (tx->sdata->drop_unencrypted &&
408 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
409 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
410 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
411 return TX_DROP;
412 } else
413 tx->key = NULL;
415 if (tx->key) {
416 tx->key->tx_rx_count++;
417 /* TODO: add threshold stuff again */
419 switch (tx->key->conf.alg) {
420 case ALG_WEP:
421 if (ieee80211_is_auth(hdr->frame_control))
422 break;
423 case ALG_TKIP:
424 case ALG_CCMP:
425 if (!ieee80211_is_data_present(hdr->frame_control))
426 tx->key = NULL;
427 break;
431 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
432 tx->skb->do_not_encrypt = 1;
434 return TX_CONTINUE;
437 static ieee80211_tx_result debug_noinline
438 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
440 struct rate_selection rsel;
441 struct ieee80211_supported_band *sband;
442 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
444 sband = tx->local->hw.wiphy->bands[tx->channel->band];
446 if (likely(tx->rate_idx < 0)) {
447 rate_control_get_rate(tx->sdata, sband, tx->sta,
448 tx->skb, &rsel);
449 if (tx->sta)
450 tx->sta->last_txrate_idx = rsel.rate_idx;
451 tx->rate_idx = rsel.rate_idx;
452 if (unlikely(rsel.probe_idx >= 0)) {
453 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
454 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
455 info->control.retries[0].rate_idx = tx->rate_idx;
456 info->control.retries[0].limit = tx->local->hw.max_altrate_tries;
457 tx->rate_idx = rsel.probe_idx;
458 } else if (info->control.retries[0].limit == 0)
459 info->control.retries[0].rate_idx = -1;
461 if (unlikely(tx->rate_idx < 0))
462 return TX_DROP;
463 } else
464 info->control.retries[0].rate_idx = -1;
466 if (tx->sdata->bss_conf.use_cts_prot &&
467 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
468 tx->last_frag_rate_idx = tx->rate_idx;
469 if (rsel.probe_idx >= 0)
470 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
471 else
472 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
473 tx->rate_idx = rsel.nonerp_idx;
474 info->tx_rate_idx = rsel.nonerp_idx;
475 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
476 } else {
477 tx->last_frag_rate_idx = tx->rate_idx;
478 info->tx_rate_idx = tx->rate_idx;
480 info->tx_rate_idx = tx->rate_idx;
482 return TX_CONTINUE;
485 static ieee80211_tx_result debug_noinline
486 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
488 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
490 struct ieee80211_supported_band *sband;
492 sband = tx->local->hw.wiphy->bands[tx->channel->band];
494 if (tx->sta)
495 info->control.sta = &tx->sta->sta;
497 if (!info->control.retry_limit) {
498 if (!is_multicast_ether_addr(hdr->addr1)) {
499 int len = min_t(int, tx->skb->len + FCS_LEN,
500 tx->local->fragmentation_threshold);
501 if (len > tx->local->rts_threshold
502 && tx->local->rts_threshold <
503 IEEE80211_MAX_RTS_THRESHOLD) {
504 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
505 info->flags |=
506 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
507 info->control.retry_limit =
508 tx->local->hw.conf.long_frame_max_tx_count - 1;
509 } else {
510 info->control.retry_limit =
511 tx->local->hw.conf.short_frame_max_tx_count - 1;
513 } else {
514 info->control.retry_limit = 1;
518 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
519 /* Do not use multiple retry rates when sending fragmented
520 * frames.
521 * TODO: The last fragment could still use multiple retry
522 * rates. */
523 info->control.retries[0].rate_idx = -1;
526 /* Use CTS protection for unicast frames sent using extended rates if
527 * there are associated non-ERP stations and RTS/CTS is not configured
528 * for the frame. */
529 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
530 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
531 (tx->flags & IEEE80211_TX_UNICAST) &&
532 tx->sdata->bss_conf.use_cts_prot &&
533 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
534 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
536 /* Transmit data frames using short preambles if the driver supports
537 * short preambles at the selected rate and short preambles are
538 * available on the network at the current point in time. */
539 if (ieee80211_is_data(hdr->frame_control) &&
540 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
541 tx->sdata->bss_conf.use_short_preamble &&
542 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
543 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
546 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
547 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
548 struct ieee80211_rate *rate;
549 s8 baserate = -1;
550 int idx;
552 /* Do not use multiple retry rates when using RTS/CTS */
553 info->control.retries[0].rate_idx = -1;
555 /* Use min(data rate, max base rate) as CTS/RTS rate */
556 rate = &sband->bitrates[tx->rate_idx];
558 for (idx = 0; idx < sband->n_bitrates; idx++) {
559 if (sband->bitrates[idx].bitrate > rate->bitrate)
560 continue;
561 if (tx->sdata->bss_conf.basic_rates & BIT(idx) &&
562 (baserate < 0 ||
563 (sband->bitrates[baserate].bitrate
564 < sband->bitrates[idx].bitrate)))
565 baserate = idx;
568 if (baserate >= 0)
569 info->control.rts_cts_rate_idx = baserate;
570 else
571 info->control.rts_cts_rate_idx = 0;
574 if (tx->sta)
575 info->control.sta = &tx->sta->sta;
577 return TX_CONTINUE;
580 static ieee80211_tx_result debug_noinline
581 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
584 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
585 u16 *seq;
586 u8 *qc;
587 int tid;
590 * Packet injection may want to control the sequence
591 * number, if we have no matching interface then we
592 * neither assign one ourselves nor ask the driver to.
594 if (unlikely(!info->control.vif))
595 return TX_CONTINUE;
597 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
598 return TX_CONTINUE;
600 if (ieee80211_hdrlen(hdr->frame_control) < 24)
601 return TX_CONTINUE;
604 * Anything but QoS data that has a sequence number field
605 * (is long enough) gets a sequence number from the global
606 * counter.
608 if (!ieee80211_is_data_qos(hdr->frame_control)) {
609 /* driver should assign sequence number */
610 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
611 /* for pure STA mode without beacons, we can do it */
612 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
613 tx->sdata->sequence_number += 0x10;
614 tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
615 return TX_CONTINUE;
619 * This should be true for injected/management frames only, for
620 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
621 * above since they are not QoS-data frames.
623 if (!tx->sta)
624 return TX_CONTINUE;
626 /* include per-STA, per-TID sequence counter */
628 qc = ieee80211_get_qos_ctl(hdr);
629 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
630 seq = &tx->sta->tid_seq[tid];
632 hdr->seq_ctrl = cpu_to_le16(*seq);
634 /* Increase the sequence number. */
635 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
637 return TX_CONTINUE;
640 static ieee80211_tx_result debug_noinline
641 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
643 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
644 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
645 struct sk_buff **frags, *first, *frag;
646 int i;
647 u16 seq;
648 u8 *pos;
649 int frag_threshold = tx->local->fragmentation_threshold;
651 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
652 return TX_CONTINUE;
655 * Warn when submitting a fragmented A-MPDU frame and drop it.
656 * This scenario is handled in __ieee80211_tx_prepare but extra
657 * caution taken here as fragmented ampdu may cause Tx stop.
659 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
660 skb_get_queue_mapping(tx->skb) >=
661 ieee80211_num_regular_queues(&tx->local->hw)))
662 return TX_DROP;
664 first = tx->skb;
666 hdrlen = ieee80211_hdrlen(hdr->frame_control);
667 payload_len = first->len - hdrlen;
668 per_fragm = frag_threshold - hdrlen - FCS_LEN;
669 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
671 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
672 if (!frags)
673 goto fail;
675 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
676 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
677 pos = first->data + hdrlen + per_fragm;
678 left = payload_len - per_fragm;
679 for (i = 0; i < num_fragm - 1; i++) {
680 struct ieee80211_hdr *fhdr;
681 size_t copylen;
683 if (left <= 0)
684 goto fail;
686 /* reserve enough extra head and tail room for possible
687 * encryption */
688 frag = frags[i] =
689 dev_alloc_skb(tx->local->tx_headroom +
690 frag_threshold +
691 IEEE80211_ENCRYPT_HEADROOM +
692 IEEE80211_ENCRYPT_TAILROOM);
693 if (!frag)
694 goto fail;
695 /* Make sure that all fragments use the same priority so
696 * that they end up using the same TX queue */
697 frag->priority = first->priority;
698 skb_reserve(frag, tx->local->tx_headroom +
699 IEEE80211_ENCRYPT_HEADROOM);
700 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
701 memcpy(fhdr, first->data, hdrlen);
702 if (i == num_fragm - 2)
703 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
704 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
705 copylen = left > per_fragm ? per_fragm : left;
706 memcpy(skb_put(frag, copylen), pos, copylen);
707 memcpy(frag->cb, first->cb, sizeof(frag->cb));
708 skb_copy_queue_mapping(frag, first);
709 frag->do_not_encrypt = first->do_not_encrypt;
711 pos += copylen;
712 left -= copylen;
714 skb_trim(first, hdrlen + per_fragm);
716 tx->num_extra_frag = num_fragm - 1;
717 tx->extra_frag = frags;
719 return TX_CONTINUE;
721 fail:
722 if (frags) {
723 for (i = 0; i < num_fragm - 1; i++)
724 if (frags[i])
725 dev_kfree_skb(frags[i]);
726 kfree(frags);
728 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
729 return TX_DROP;
732 static ieee80211_tx_result debug_noinline
733 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
735 if (!tx->key)
736 return TX_CONTINUE;
738 switch (tx->key->conf.alg) {
739 case ALG_WEP:
740 return ieee80211_crypto_wep_encrypt(tx);
741 case ALG_TKIP:
742 return ieee80211_crypto_tkip_encrypt(tx);
743 case ALG_CCMP:
744 return ieee80211_crypto_ccmp_encrypt(tx);
747 /* not reached */
748 WARN_ON(1);
749 return TX_DROP;
752 static ieee80211_tx_result debug_noinline
753 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
755 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
756 int next_len, i;
757 int group_addr = is_multicast_ether_addr(hdr->addr1);
759 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
760 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
761 return TX_CONTINUE;
764 hdr->duration_id = ieee80211_duration(tx, group_addr,
765 tx->extra_frag[0]->len);
767 for (i = 0; i < tx->num_extra_frag; i++) {
768 if (i + 1 < tx->num_extra_frag) {
769 next_len = tx->extra_frag[i + 1]->len;
770 } else {
771 next_len = 0;
772 tx->rate_idx = tx->last_frag_rate_idx;
775 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
776 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
779 return TX_CONTINUE;
782 static ieee80211_tx_result debug_noinline
783 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
785 int i;
787 if (!tx->sta)
788 return TX_CONTINUE;
790 tx->sta->tx_packets++;
791 tx->sta->tx_fragments++;
792 tx->sta->tx_bytes += tx->skb->len;
793 if (tx->extra_frag) {
794 tx->sta->tx_fragments += tx->num_extra_frag;
795 for (i = 0; i < tx->num_extra_frag; i++)
796 tx->sta->tx_bytes += tx->extra_frag[i]->len;
799 return TX_CONTINUE;
803 /* actual transmit path */
806 * deal with packet injection down monitor interface
807 * with Radiotap Header -- only called for monitor mode interface
809 static ieee80211_tx_result
810 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
811 struct sk_buff *skb)
814 * this is the moment to interpret and discard the radiotap header that
815 * must be at the start of the packet injected in Monitor mode
817 * Need to take some care with endian-ness since radiotap
818 * args are little-endian
821 struct ieee80211_radiotap_iterator iterator;
822 struct ieee80211_radiotap_header *rthdr =
823 (struct ieee80211_radiotap_header *) skb->data;
824 struct ieee80211_supported_band *sband;
825 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
826 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
828 sband = tx->local->hw.wiphy->bands[tx->channel->band];
830 skb->do_not_encrypt = 1;
831 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
834 * for every radiotap entry that is present
835 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
836 * entries present, or -EINVAL on error)
839 while (!ret) {
840 int i, target_rate;
842 ret = ieee80211_radiotap_iterator_next(&iterator);
844 if (ret)
845 continue;
847 /* see if this argument is something we can use */
848 switch (iterator.this_arg_index) {
850 * You must take care when dereferencing iterator.this_arg
851 * for multibyte types... the pointer is not aligned. Use
852 * get_unaligned((type *)iterator.this_arg) to dereference
853 * iterator.this_arg for type "type" safely on all arches.
855 case IEEE80211_RADIOTAP_RATE:
857 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
858 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
860 target_rate = (*iterator.this_arg) * 5;
861 for (i = 0; i < sband->n_bitrates; i++) {
862 struct ieee80211_rate *r;
864 r = &sband->bitrates[i];
866 if (r->bitrate == target_rate) {
867 tx->rate_idx = i;
868 break;
871 break;
873 case IEEE80211_RADIOTAP_ANTENNA:
875 * radiotap uses 0 for 1st ant, mac80211 is 1 for
876 * 1st ant
878 info->antenna_sel_tx = (*iterator.this_arg) + 1;
879 break;
881 #if 0
882 case IEEE80211_RADIOTAP_DBM_TX_POWER:
883 control->power_level = *iterator.this_arg;
884 break;
885 #endif
887 case IEEE80211_RADIOTAP_FLAGS:
888 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
890 * this indicates that the skb we have been
891 * handed has the 32-bit FCS CRC at the end...
892 * we should react to that by snipping it off
893 * because it will be recomputed and added
894 * on transmission
896 if (skb->len < (iterator.max_length + FCS_LEN))
897 return TX_DROP;
899 skb_trim(skb, skb->len - FCS_LEN);
901 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
902 tx->skb->do_not_encrypt = 0;
903 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
904 tx->flags |= IEEE80211_TX_FRAGMENTED;
905 break;
908 * Please update the file
909 * Documentation/networking/mac80211-injection.txt
910 * when parsing new fields here.
913 default:
914 break;
918 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
919 return TX_DROP;
922 * remove the radiotap header
923 * iterator->max_length was sanity-checked against
924 * skb->len by iterator init
926 skb_pull(skb, iterator.max_length);
928 return TX_CONTINUE;
932 * initialises @tx
934 static ieee80211_tx_result
935 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
936 struct sk_buff *skb,
937 struct net_device *dev)
939 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
940 struct ieee80211_hdr *hdr;
941 struct ieee80211_sub_if_data *sdata;
942 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
944 int hdrlen;
946 memset(tx, 0, sizeof(*tx));
947 tx->skb = skb;
948 tx->dev = dev; /* use original interface */
949 tx->local = local;
950 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
951 tx->channel = local->hw.conf.channel;
952 tx->rate_idx = -1;
953 tx->last_frag_rate_idx = -1;
955 * Set this flag (used below to indicate "automatic fragmentation"),
956 * it will be cleared/left by radiotap as desired.
958 tx->flags |= IEEE80211_TX_FRAGMENTED;
960 /* process and remove the injection radiotap header */
961 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
962 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
963 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
964 return TX_DROP;
967 * __ieee80211_parse_tx_radiotap has now removed
968 * the radiotap header that was present and pre-filled
969 * 'tx' with tx control information.
973 hdr = (struct ieee80211_hdr *) skb->data;
975 tx->sta = sta_info_get(local, hdr->addr1);
977 if (is_multicast_ether_addr(hdr->addr1)) {
978 tx->flags &= ~IEEE80211_TX_UNICAST;
979 info->flags |= IEEE80211_TX_CTL_NO_ACK;
980 } else {
981 tx->flags |= IEEE80211_TX_UNICAST;
982 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
985 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
986 if ((tx->flags & IEEE80211_TX_UNICAST) &&
987 skb->len + FCS_LEN > local->fragmentation_threshold &&
988 !local->ops->set_frag_threshold &&
989 !(info->flags & IEEE80211_TX_CTL_AMPDU))
990 tx->flags |= IEEE80211_TX_FRAGMENTED;
991 else
992 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
995 if (!tx->sta)
996 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
997 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
998 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1000 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1001 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1002 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1003 tx->ethertype = (pos[0] << 8) | pos[1];
1005 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1007 return TX_CONTINUE;
1011 * NB: @tx is uninitialised when passed in here
1013 static int ieee80211_tx_prepare(struct ieee80211_local *local,
1014 struct ieee80211_tx_data *tx,
1015 struct sk_buff *skb)
1017 struct net_device *dev;
1019 dev = dev_get_by_index(&init_net, skb->iif);
1020 if (unlikely(dev && !is_ieee80211_device(local, dev))) {
1021 dev_put(dev);
1022 dev = NULL;
1024 if (unlikely(!dev))
1025 return -ENODEV;
1026 /* initialises tx with control */
1027 __ieee80211_tx_prepare(tx, skb, dev);
1028 dev_put(dev);
1029 return 0;
1032 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1033 struct ieee80211_tx_data *tx)
1035 struct ieee80211_tx_info *info;
1036 int ret, i;
1038 if (skb) {
1039 if (netif_subqueue_stopped(local->mdev, skb))
1040 return IEEE80211_TX_AGAIN;
1041 info = IEEE80211_SKB_CB(skb);
1043 ret = local->ops->tx(local_to_hw(local), skb);
1044 if (ret)
1045 return IEEE80211_TX_AGAIN;
1046 local->mdev->trans_start = jiffies;
1047 ieee80211_led_tx(local, 1);
1049 if (tx->extra_frag) {
1050 for (i = 0; i < tx->num_extra_frag; i++) {
1051 if (!tx->extra_frag[i])
1052 continue;
1053 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1054 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1055 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1056 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1057 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1058 if (netif_subqueue_stopped(local->mdev,
1059 tx->extra_frag[i]))
1060 return IEEE80211_TX_FRAG_AGAIN;
1061 if (i == tx->num_extra_frag) {
1062 info->tx_rate_idx = tx->last_frag_rate_idx;
1064 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1065 info->flags |=
1066 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1067 else
1068 info->flags &=
1069 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1072 ret = local->ops->tx(local_to_hw(local),
1073 tx->extra_frag[i]);
1074 if (ret)
1075 return IEEE80211_TX_FRAG_AGAIN;
1076 local->mdev->trans_start = jiffies;
1077 ieee80211_led_tx(local, 1);
1078 tx->extra_frag[i] = NULL;
1080 kfree(tx->extra_frag);
1081 tx->extra_frag = NULL;
1083 return IEEE80211_TX_OK;
1087 * Invoke TX handlers, return 0 on success and non-zero if the
1088 * frame was dropped or queued.
1090 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1092 struct sk_buff *skb = tx->skb;
1093 ieee80211_tx_result res = TX_DROP;
1094 int i;
1096 #define CALL_TXH(txh) \
1097 res = txh(tx); \
1098 if (res != TX_CONTINUE) \
1099 goto txh_done;
1101 CALL_TXH(ieee80211_tx_h_check_assoc)
1102 CALL_TXH(ieee80211_tx_h_ps_buf)
1103 CALL_TXH(ieee80211_tx_h_select_key)
1104 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1105 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1106 CALL_TXH(ieee80211_tx_h_misc)
1107 CALL_TXH(ieee80211_tx_h_sequence)
1108 CALL_TXH(ieee80211_tx_h_fragment)
1109 /* handlers after fragment must be aware of tx info fragmentation! */
1110 CALL_TXH(ieee80211_tx_h_encrypt)
1111 CALL_TXH(ieee80211_tx_h_calculate_duration)
1112 CALL_TXH(ieee80211_tx_h_stats)
1113 #undef CALL_TXH
1115 txh_done:
1116 if (unlikely(res == TX_DROP)) {
1117 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1118 dev_kfree_skb(skb);
1119 for (i = 0; i < tx->num_extra_frag; i++)
1120 if (tx->extra_frag[i])
1121 dev_kfree_skb(tx->extra_frag[i]);
1122 kfree(tx->extra_frag);
1123 return -1;
1124 } else if (unlikely(res == TX_QUEUED)) {
1125 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1126 return -1;
1129 return 0;
1132 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1134 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1135 struct sta_info *sta;
1136 struct ieee80211_tx_data tx;
1137 ieee80211_tx_result res_prepare;
1138 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1139 int ret, i;
1140 u16 queue;
1142 queue = skb_get_queue_mapping(skb);
1144 WARN_ON(test_bit(queue, local->queues_pending));
1146 if (unlikely(skb->len < 10)) {
1147 dev_kfree_skb(skb);
1148 return 0;
1151 rcu_read_lock();
1153 /* initialises tx */
1154 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1156 if (res_prepare == TX_DROP) {
1157 dev_kfree_skb(skb);
1158 rcu_read_unlock();
1159 return 0;
1162 sta = tx.sta;
1163 tx.channel = local->hw.conf.channel;
1164 info->band = tx.channel->band;
1166 if (invoke_tx_handlers(&tx))
1167 goto out;
1169 retry:
1170 ret = __ieee80211_tx(local, skb, &tx);
1171 if (ret) {
1172 struct ieee80211_tx_stored_packet *store;
1175 * Since there are no fragmented frames on A-MPDU
1176 * queues, there's no reason for a driver to reject
1177 * a frame there, warn and drop it.
1179 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1180 goto drop;
1182 store = &local->pending_packet[queue];
1184 if (ret == IEEE80211_TX_FRAG_AGAIN)
1185 skb = NULL;
1187 set_bit(queue, local->queues_pending);
1188 smp_mb();
1190 * When the driver gets out of buffers during sending of
1191 * fragments and calls ieee80211_stop_queue, the netif
1192 * subqueue is stopped. There is, however, a small window
1193 * in which the PENDING bit is not yet set. If a buffer
1194 * gets available in that window (i.e. driver calls
1195 * ieee80211_wake_queue), we would end up with ieee80211_tx
1196 * called with the PENDING bit still set. Prevent this by
1197 * continuing transmitting here when that situation is
1198 * possible to have happened.
1200 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1201 clear_bit(queue, local->queues_pending);
1202 goto retry;
1204 store->skb = skb;
1205 store->extra_frag = tx.extra_frag;
1206 store->num_extra_frag = tx.num_extra_frag;
1207 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1208 store->last_frag_rate_ctrl_probe =
1209 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1211 out:
1212 rcu_read_unlock();
1213 return 0;
1215 drop:
1216 if (skb)
1217 dev_kfree_skb(skb);
1218 for (i = 0; i < tx.num_extra_frag; i++)
1219 if (tx.extra_frag[i])
1220 dev_kfree_skb(tx.extra_frag[i]);
1221 kfree(tx.extra_frag);
1222 rcu_read_unlock();
1223 return 0;
1226 /* device xmit handlers */
1228 static int ieee80211_skb_resize(struct ieee80211_local *local,
1229 struct sk_buff *skb,
1230 int head_need, bool may_encrypt)
1232 int tail_need = 0;
1235 * This could be optimised, devices that do full hardware
1236 * crypto (including TKIP MMIC) need no tailroom... But we
1237 * have no drivers for such devices currently.
1239 if (may_encrypt) {
1240 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1241 tail_need -= skb_tailroom(skb);
1242 tail_need = max_t(int, tail_need, 0);
1245 if (head_need || tail_need) {
1246 /* Sorry. Can't account for this any more */
1247 skb_orphan(skb);
1250 if (skb_header_cloned(skb))
1251 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1252 else
1253 I802_DEBUG_INC(local->tx_expand_skb_head);
1255 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1256 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1257 wiphy_name(local->hw.wiphy));
1258 return -ENOMEM;
1261 /* update truesize too */
1262 skb->truesize += head_need + tail_need;
1264 return 0;
1267 int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
1269 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
1270 struct ieee80211_local *local = mpriv->local;
1271 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1273 struct net_device *odev = NULL;
1274 struct ieee80211_sub_if_data *osdata;
1275 int headroom;
1276 bool may_encrypt;
1277 enum {
1278 NOT_MONITOR,
1279 FOUND_SDATA,
1280 UNKNOWN_ADDRESS,
1281 } monitor_iface = NOT_MONITOR;
1282 int ret;
1284 if (skb->iif)
1285 odev = dev_get_by_index(&init_net, skb->iif);
1286 if (unlikely(odev && !is_ieee80211_device(local, odev))) {
1287 dev_put(odev);
1288 odev = NULL;
1290 if (unlikely(!odev)) {
1291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1292 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1293 "originating device\n", dev->name);
1294 #endif
1295 dev_kfree_skb(skb);
1296 return 0;
1299 memset(info, 0, sizeof(*info));
1301 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1303 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1305 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1306 ieee80211_is_data(hdr->frame_control)) {
1307 if (is_multicast_ether_addr(hdr->addr3))
1308 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1309 else
1310 if (mesh_nexthop_lookup(skb, osdata))
1311 return 0;
1312 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1313 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1314 fwded_frames);
1315 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1316 struct ieee80211_sub_if_data *sdata;
1317 int hdrlen;
1318 u16 len_rthdr;
1320 info->flags |= IEEE80211_TX_CTL_INJECTED;
1321 monitor_iface = UNKNOWN_ADDRESS;
1323 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1324 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1325 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1327 /* check the header is complete in the frame */
1328 if (likely(skb->len >= len_rthdr + hdrlen)) {
1330 * We process outgoing injected frames that have a
1331 * local address we handle as though they are our
1332 * own frames.
1333 * This code here isn't entirely correct, the local
1334 * MAC address is not necessarily enough to find
1335 * the interface to use; for that proper VLAN/WDS
1336 * support we will need a different mechanism.
1339 rcu_read_lock();
1340 list_for_each_entry_rcu(sdata, &local->interfaces,
1341 list) {
1342 if (!netif_running(sdata->dev))
1343 continue;
1344 if (compare_ether_addr(sdata->dev->dev_addr,
1345 hdr->addr2)) {
1346 dev_hold(sdata->dev);
1347 dev_put(odev);
1348 osdata = sdata;
1349 odev = osdata->dev;
1350 skb->iif = sdata->dev->ifindex;
1351 monitor_iface = FOUND_SDATA;
1352 break;
1355 rcu_read_unlock();
1359 may_encrypt = !skb->do_not_encrypt;
1361 headroom = osdata->local->tx_headroom;
1362 if (may_encrypt)
1363 headroom += IEEE80211_ENCRYPT_HEADROOM;
1364 headroom -= skb_headroom(skb);
1365 headroom = max_t(int, 0, headroom);
1367 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1368 dev_kfree_skb(skb);
1369 dev_put(odev);
1370 return 0;
1373 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1374 osdata = container_of(osdata->bss,
1375 struct ieee80211_sub_if_data,
1376 u.ap);
1377 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1378 info->control.vif = &osdata->vif;
1379 ret = ieee80211_tx(odev, skb);
1380 dev_put(odev);
1382 return ret;
1385 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1386 struct net_device *dev)
1388 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1389 struct ieee80211_radiotap_header *prthdr =
1390 (struct ieee80211_radiotap_header *)skb->data;
1391 u16 len_rthdr;
1393 /* check for not even having the fixed radiotap header part */
1394 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1395 goto fail; /* too short to be possibly valid */
1397 /* is it a header version we can trust to find length from? */
1398 if (unlikely(prthdr->it_version))
1399 goto fail; /* only version 0 is supported */
1401 /* then there must be a radiotap header with a length we can use */
1402 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1404 /* does the skb contain enough to deliver on the alleged length? */
1405 if (unlikely(skb->len < len_rthdr))
1406 goto fail; /* skb too short for claimed rt header extent */
1408 skb->dev = local->mdev;
1410 /* needed because we set skb device to master */
1411 skb->iif = dev->ifindex;
1413 /* sometimes we do encrypt injected frames, will be fixed
1414 * up in radiotap parser if not wanted */
1415 skb->do_not_encrypt = 0;
1418 * fix up the pointers accounting for the radiotap
1419 * header still being in there. We are being given
1420 * a precooked IEEE80211 header so no need for
1421 * normal processing
1423 skb_set_mac_header(skb, len_rthdr);
1425 * these are just fixed to the end of the rt area since we
1426 * don't have any better information and at this point, nobody cares
1428 skb_set_network_header(skb, len_rthdr);
1429 skb_set_transport_header(skb, len_rthdr);
1431 /* pass the radiotap header up to the next stage intact */
1432 dev_queue_xmit(skb);
1433 return NETDEV_TX_OK;
1435 fail:
1436 dev_kfree_skb(skb);
1437 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1441 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1442 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1443 * @skb: packet to be sent
1444 * @dev: incoming interface
1446 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1447 * not be freed, and caller is responsible for either retrying later or freeing
1448 * skb).
1450 * This function takes in an Ethernet header and encapsulates it with suitable
1451 * IEEE 802.11 header based on which interface the packet is coming in. The
1452 * encapsulated packet will then be passed to master interface, wlan#.11, for
1453 * transmission (through low-level driver).
1455 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1456 struct net_device *dev)
1458 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1459 struct ieee80211_local *local = sdata->local;
1460 int ret = 1, head_need;
1461 u16 ethertype, hdrlen, meshhdrlen = 0;
1462 __le16 fc;
1463 struct ieee80211_hdr hdr;
1464 struct ieee80211s_hdr mesh_hdr;
1465 const u8 *encaps_data;
1466 int encaps_len, skip_header_bytes;
1467 int nh_pos, h_pos;
1468 struct sta_info *sta;
1469 u32 sta_flags = 0;
1471 if (unlikely(skb->len < ETH_HLEN)) {
1472 ret = 0;
1473 goto fail;
1476 nh_pos = skb_network_header(skb) - skb->data;
1477 h_pos = skb_transport_header(skb) - skb->data;
1479 /* convert Ethernet header to proper 802.11 header (based on
1480 * operation mode) */
1481 ethertype = (skb->data[12] << 8) | skb->data[13];
1482 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1484 switch (sdata->vif.type) {
1485 case NL80211_IFTYPE_AP:
1486 case NL80211_IFTYPE_AP_VLAN:
1487 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1488 /* DA BSSID SA */
1489 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1490 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1491 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1492 hdrlen = 24;
1493 break;
1494 case NL80211_IFTYPE_WDS:
1495 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1496 /* RA TA DA SA */
1497 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1498 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1499 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1500 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1501 hdrlen = 30;
1502 break;
1503 #ifdef CONFIG_MAC80211_MESH
1504 case NL80211_IFTYPE_MESH_POINT:
1505 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1506 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1507 /* Do not send frames with mesh_ttl == 0 */
1508 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1509 ret = 0;
1510 goto fail;
1512 memset(&mesh_hdr, 0, sizeof(mesh_hdr));
1514 if (compare_ether_addr(dev->dev_addr,
1515 skb->data + ETH_ALEN) == 0) {
1516 /* RA TA DA SA */
1517 memset(hdr.addr1, 0, ETH_ALEN);
1518 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1519 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1520 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1521 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1522 } else {
1523 /* packet from other interface */
1524 struct mesh_path *mppath;
1526 memset(hdr.addr1, 0, ETH_ALEN);
1527 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1528 memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN);
1530 if (is_multicast_ether_addr(skb->data))
1531 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1532 else {
1533 rcu_read_lock();
1534 mppath = mpp_path_lookup(skb->data, sdata);
1535 if (mppath)
1536 memcpy(hdr.addr3, mppath->mpp, ETH_ALEN);
1537 else
1538 memset(hdr.addr3, 0xff, ETH_ALEN);
1539 rcu_read_unlock();
1542 mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6;
1543 mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
1544 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum);
1545 memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN);
1546 memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN);
1547 sdata->u.mesh.mesh_seqnum++;
1548 meshhdrlen = 18;
1550 hdrlen = 30;
1551 break;
1552 #endif
1553 case NL80211_IFTYPE_STATION:
1554 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1555 /* BSSID SA DA */
1556 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1557 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1558 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1559 hdrlen = 24;
1560 break;
1561 case NL80211_IFTYPE_ADHOC:
1562 /* DA SA BSSID */
1563 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1564 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1565 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1566 hdrlen = 24;
1567 break;
1568 default:
1569 ret = 0;
1570 goto fail;
1574 * There's no need to try to look up the destination
1575 * if it is a multicast address (which can only happen
1576 * in AP mode)
1578 if (!is_multicast_ether_addr(hdr.addr1)) {
1579 rcu_read_lock();
1580 sta = sta_info_get(local, hdr.addr1);
1581 if (sta)
1582 sta_flags = get_sta_flags(sta);
1583 rcu_read_unlock();
1586 /* receiver and we are QoS enabled, use a QoS type frame */
1587 if (sta_flags & WLAN_STA_WME &&
1588 ieee80211_num_regular_queues(&local->hw) >= 4) {
1589 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1590 hdrlen += 2;
1594 * Drop unicast frames to unauthorised stations unless they are
1595 * EAPOL frames from the local station.
1597 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1598 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1599 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1600 !(ethertype == ETH_P_PAE &&
1601 compare_ether_addr(dev->dev_addr,
1602 skb->data + ETH_ALEN) == 0))) {
1603 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1604 if (net_ratelimit())
1605 printk(KERN_DEBUG "%s: dropped frame to %pM"
1606 " (unauthorized port)\n", dev->name,
1607 hdr.addr1);
1608 #endif
1610 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1612 ret = 0;
1613 goto fail;
1616 hdr.frame_control = fc;
1617 hdr.duration_id = 0;
1618 hdr.seq_ctrl = 0;
1620 skip_header_bytes = ETH_HLEN;
1621 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1622 encaps_data = bridge_tunnel_header;
1623 encaps_len = sizeof(bridge_tunnel_header);
1624 skip_header_bytes -= 2;
1625 } else if (ethertype >= 0x600) {
1626 encaps_data = rfc1042_header;
1627 encaps_len = sizeof(rfc1042_header);
1628 skip_header_bytes -= 2;
1629 } else {
1630 encaps_data = NULL;
1631 encaps_len = 0;
1634 skb_pull(skb, skip_header_bytes);
1635 nh_pos -= skip_header_bytes;
1636 h_pos -= skip_header_bytes;
1638 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1641 * So we need to modify the skb header and hence need a copy of
1642 * that. The head_need variable above doesn't, so far, include
1643 * the needed header space that we don't need right away. If we
1644 * can, then we don't reallocate right now but only after the
1645 * frame arrives at the master device (if it does...)
1647 * If we cannot, however, then we will reallocate to include all
1648 * the ever needed space. Also, if we need to reallocate it anyway,
1649 * make it big enough for everything we may ever need.
1652 if (head_need > 0 || skb_cloned(skb)) {
1653 head_need += IEEE80211_ENCRYPT_HEADROOM;
1654 head_need += local->tx_headroom;
1655 head_need = max_t(int, 0, head_need);
1656 if (ieee80211_skb_resize(local, skb, head_need, true))
1657 goto fail;
1660 if (encaps_data) {
1661 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1662 nh_pos += encaps_len;
1663 h_pos += encaps_len;
1666 if (meshhdrlen > 0) {
1667 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1668 nh_pos += meshhdrlen;
1669 h_pos += meshhdrlen;
1672 if (ieee80211_is_data_qos(fc)) {
1673 __le16 *qos_control;
1675 qos_control = (__le16*) skb_push(skb, 2);
1676 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1678 * Maybe we could actually set some fields here, for now just
1679 * initialise to zero to indicate no special operation.
1681 *qos_control = 0;
1682 } else
1683 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1685 nh_pos += hdrlen;
1686 h_pos += hdrlen;
1688 skb->iif = dev->ifindex;
1690 skb->dev = local->mdev;
1691 dev->stats.tx_packets++;
1692 dev->stats.tx_bytes += skb->len;
1694 /* Update skb pointers to various headers since this modified frame
1695 * is going to go through Linux networking code that may potentially
1696 * need things like pointer to IP header. */
1697 skb_set_mac_header(skb, 0);
1698 skb_set_network_header(skb, nh_pos);
1699 skb_set_transport_header(skb, h_pos);
1701 dev->trans_start = jiffies;
1702 dev_queue_xmit(skb);
1704 return 0;
1706 fail:
1707 if (!ret)
1708 dev_kfree_skb(skb);
1710 return ret;
1715 * ieee80211_clear_tx_pending may not be called in a context where
1716 * it is possible that it packets could come in again.
1718 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1720 int i, j;
1721 struct ieee80211_tx_stored_packet *store;
1723 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1724 if (!test_bit(i, local->queues_pending))
1725 continue;
1726 store = &local->pending_packet[i];
1727 kfree_skb(store->skb);
1728 for (j = 0; j < store->num_extra_frag; j++)
1729 kfree_skb(store->extra_frag[j]);
1730 kfree(store->extra_frag);
1731 clear_bit(i, local->queues_pending);
1736 * Transmit all pending packets. Called from tasklet, locks master device
1737 * TX lock so that no new packets can come in.
1739 void ieee80211_tx_pending(unsigned long data)
1741 struct ieee80211_local *local = (struct ieee80211_local *)data;
1742 struct net_device *dev = local->mdev;
1743 struct ieee80211_tx_stored_packet *store;
1744 struct ieee80211_tx_data tx;
1745 int i, ret;
1747 netif_tx_lock_bh(dev);
1748 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1749 /* Check that this queue is ok */
1750 if (__netif_subqueue_stopped(local->mdev, i) &&
1751 !test_bit(i, local->queues_pending_run))
1752 continue;
1754 if (!test_bit(i, local->queues_pending)) {
1755 clear_bit(i, local->queues_pending_run);
1756 ieee80211_wake_queue(&local->hw, i);
1757 continue;
1760 clear_bit(i, local->queues_pending_run);
1761 netif_start_subqueue(local->mdev, i);
1763 store = &local->pending_packet[i];
1764 tx.extra_frag = store->extra_frag;
1765 tx.num_extra_frag = store->num_extra_frag;
1766 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1767 tx.flags = 0;
1768 if (store->last_frag_rate_ctrl_probe)
1769 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1770 ret = __ieee80211_tx(local, store->skb, &tx);
1771 if (ret) {
1772 if (ret == IEEE80211_TX_FRAG_AGAIN)
1773 store->skb = NULL;
1774 } else {
1775 clear_bit(i, local->queues_pending);
1776 ieee80211_wake_queue(&local->hw, i);
1779 netif_tx_unlock_bh(dev);
1782 /* functions for drivers to get certain frames */
1784 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1785 struct ieee80211_if_ap *bss,
1786 struct sk_buff *skb,
1787 struct beacon_data *beacon)
1789 u8 *pos, *tim;
1790 int aid0 = 0;
1791 int i, have_bits = 0, n1, n2;
1793 /* Generate bitmap for TIM only if there are any STAs in power save
1794 * mode. */
1795 if (atomic_read(&bss->num_sta_ps) > 0)
1796 /* in the hope that this is faster than
1797 * checking byte-for-byte */
1798 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1799 IEEE80211_MAX_AID+1);
1801 if (bss->dtim_count == 0)
1802 bss->dtim_count = beacon->dtim_period - 1;
1803 else
1804 bss->dtim_count--;
1806 tim = pos = (u8 *) skb_put(skb, 6);
1807 *pos++ = WLAN_EID_TIM;
1808 *pos++ = 4;
1809 *pos++ = bss->dtim_count;
1810 *pos++ = beacon->dtim_period;
1812 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1813 aid0 = 1;
1815 if (have_bits) {
1816 /* Find largest even number N1 so that bits numbered 1 through
1817 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1818 * (N2 + 1) x 8 through 2007 are 0. */
1819 n1 = 0;
1820 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1821 if (bss->tim[i]) {
1822 n1 = i & 0xfe;
1823 break;
1826 n2 = n1;
1827 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1828 if (bss->tim[i]) {
1829 n2 = i;
1830 break;
1834 /* Bitmap control */
1835 *pos++ = n1 | aid0;
1836 /* Part Virt Bitmap */
1837 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1839 tim[1] = n2 - n1 + 4;
1840 skb_put(skb, n2 - n1);
1841 } else {
1842 *pos++ = aid0; /* Bitmap control */
1843 *pos++ = 0; /* Part Virt Bitmap */
1847 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1848 struct ieee80211_vif *vif)
1850 struct ieee80211_local *local = hw_to_local(hw);
1851 struct sk_buff *skb = NULL;
1852 struct ieee80211_tx_info *info;
1853 struct net_device *bdev;
1854 struct ieee80211_sub_if_data *sdata = NULL;
1855 struct ieee80211_if_ap *ap = NULL;
1856 struct ieee80211_if_sta *ifsta = NULL;
1857 struct rate_selection rsel;
1858 struct beacon_data *beacon;
1859 struct ieee80211_supported_band *sband;
1860 enum ieee80211_band band = local->hw.conf.channel->band;
1862 sband = local->hw.wiphy->bands[band];
1864 rcu_read_lock();
1866 sdata = vif_to_sdata(vif);
1867 bdev = sdata->dev;
1869 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1870 ap = &sdata->u.ap;
1871 beacon = rcu_dereference(ap->beacon);
1872 if (ap && beacon) {
1874 * headroom, head length,
1875 * tail length and maximum TIM length
1877 skb = dev_alloc_skb(local->tx_headroom +
1878 beacon->head_len +
1879 beacon->tail_len + 256);
1880 if (!skb)
1881 goto out;
1883 skb_reserve(skb, local->tx_headroom);
1884 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1885 beacon->head_len);
1888 * Not very nice, but we want to allow the driver to call
1889 * ieee80211_beacon_get() as a response to the set_tim()
1890 * callback. That, however, is already invoked under the
1891 * sta_lock to guarantee consistent and race-free update
1892 * of the tim bitmap in mac80211 and the driver.
1894 if (local->tim_in_locked_section) {
1895 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1896 } else {
1897 unsigned long flags;
1899 spin_lock_irqsave(&local->sta_lock, flags);
1900 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1901 spin_unlock_irqrestore(&local->sta_lock, flags);
1904 if (beacon->tail)
1905 memcpy(skb_put(skb, beacon->tail_len),
1906 beacon->tail, beacon->tail_len);
1907 } else
1908 goto out;
1909 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1910 struct ieee80211_hdr *hdr;
1911 ifsta = &sdata->u.sta;
1913 if (!ifsta->probe_resp)
1914 goto out;
1916 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1917 if (!skb)
1918 goto out;
1920 hdr = (struct ieee80211_hdr *) skb->data;
1921 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1922 IEEE80211_STYPE_BEACON);
1924 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1925 struct ieee80211_mgmt *mgmt;
1926 u8 *pos;
1928 /* headroom, head length, tail length and maximum TIM length */
1929 skb = dev_alloc_skb(local->tx_headroom + 400);
1930 if (!skb)
1931 goto out;
1933 skb_reserve(skb, local->hw.extra_tx_headroom);
1934 mgmt = (struct ieee80211_mgmt *)
1935 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1936 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1937 mgmt->frame_control =
1938 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1939 memset(mgmt->da, 0xff, ETH_ALEN);
1940 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1941 /* BSSID is left zeroed, wildcard value */
1942 mgmt->u.beacon.beacon_int =
1943 cpu_to_le16(local->hw.conf.beacon_int);
1944 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1946 pos = skb_put(skb, 2);
1947 *pos++ = WLAN_EID_SSID;
1948 *pos++ = 0x0;
1950 mesh_mgmt_ies_add(skb, sdata);
1951 } else {
1952 WARN_ON(1);
1953 goto out;
1956 info = IEEE80211_SKB_CB(skb);
1958 skb->do_not_encrypt = 1;
1960 info->band = band;
1961 rate_control_get_rate(sdata, sband, NULL, skb, &rsel);
1963 if (unlikely(rsel.rate_idx < 0)) {
1964 if (net_ratelimit()) {
1965 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1966 "no rate found\n",
1967 wiphy_name(local->hw.wiphy));
1969 dev_kfree_skb_any(skb);
1970 skb = NULL;
1971 goto out;
1974 info->control.vif = vif;
1975 info->tx_rate_idx = rsel.rate_idx;
1977 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1978 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1979 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
1980 if (sdata->bss_conf.use_short_preamble &&
1981 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1982 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1984 info->control.retry_limit = 1;
1986 out:
1987 rcu_read_unlock();
1988 return skb;
1990 EXPORT_SYMBOL(ieee80211_beacon_get);
1992 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1993 const void *frame, size_t frame_len,
1994 const struct ieee80211_tx_info *frame_txctl,
1995 struct ieee80211_rts *rts)
1997 const struct ieee80211_hdr *hdr = frame;
1999 rts->frame_control =
2000 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2001 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2002 frame_txctl);
2003 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2004 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2006 EXPORT_SYMBOL(ieee80211_rts_get);
2008 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2009 const void *frame, size_t frame_len,
2010 const struct ieee80211_tx_info *frame_txctl,
2011 struct ieee80211_cts *cts)
2013 const struct ieee80211_hdr *hdr = frame;
2015 cts->frame_control =
2016 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2017 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2018 frame_len, frame_txctl);
2019 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2021 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2023 struct sk_buff *
2024 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2025 struct ieee80211_vif *vif)
2027 struct ieee80211_local *local = hw_to_local(hw);
2028 struct sk_buff *skb = NULL;
2029 struct sta_info *sta;
2030 struct ieee80211_tx_data tx;
2031 struct net_device *bdev;
2032 struct ieee80211_sub_if_data *sdata;
2033 struct ieee80211_if_ap *bss = NULL;
2034 struct beacon_data *beacon;
2035 struct ieee80211_tx_info *info;
2037 sdata = vif_to_sdata(vif);
2038 bdev = sdata->dev;
2039 bss = &sdata->u.ap;
2041 if (!bss)
2042 return NULL;
2044 rcu_read_lock();
2045 beacon = rcu_dereference(bss->beacon);
2047 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2048 goto out;
2050 if (bss->dtim_count != 0)
2051 goto out; /* send buffered bc/mc only after DTIM beacon */
2053 while (1) {
2054 skb = skb_dequeue(&bss->ps_bc_buf);
2055 if (!skb)
2056 goto out;
2057 local->total_ps_buffered--;
2059 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2060 struct ieee80211_hdr *hdr =
2061 (struct ieee80211_hdr *) skb->data;
2062 /* more buffered multicast/broadcast frames ==> set
2063 * MoreData flag in IEEE 802.11 header to inform PS
2064 * STAs */
2065 hdr->frame_control |=
2066 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2069 if (!ieee80211_tx_prepare(local, &tx, skb))
2070 break;
2071 dev_kfree_skb_any(skb);
2074 info = IEEE80211_SKB_CB(skb);
2076 sta = tx.sta;
2077 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2078 tx.channel = local->hw.conf.channel;
2079 info->band = tx.channel->band;
2081 if (invoke_tx_handlers(&tx))
2082 skb = NULL;
2083 out:
2084 rcu_read_unlock();
2086 return skb;
2088 EXPORT_SYMBOL(ieee80211_get_buffered_bc);