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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 "driver-ops.h"
29#include "led.h"
30#include "mesh.h"
31#include "wep.h"
32#include "wpa.h"
33#include "wme.h"
34#include "rate.h"
35
36#define IEEE80211_TX_OK 0
37#define IEEE80211_TX_AGAIN 1
38#define IEEE80211_TX_PENDING 2
39
40
41
42static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
43 int next_frag_len)
44{
45 int rate, mrate, erp, dur, i;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
51
52
53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
54 return 0;
55
56
57 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
58 return 0;
59
60 sband = local->hw.wiphy->bands[tx->channel->band];
61 txrate = &sband->bitrates[info->control.rates[0].idx];
62
63 erp = txrate->flags & IEEE80211_RATE_ERP_G;
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82 hdr = (struct ieee80211_hdr *)tx->skb->data;
83 if (ieee80211_is_ctl(hdr->frame_control)) {
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98 return 0;
99 }
100
101
102 if (0 )
103 return cpu_to_le16(32768);
104
105 if (group_addr)
106 return 0;
107
108
109
110
111
112
113
114
115
116
117
118 rate = -1;
119
120 mrate = sband->bitrates[0].bitrate;
121 for (i = 0; i < sband->n_bitrates; i++) {
122 struct ieee80211_rate *r = &sband->bitrates[i];
123
124 if (r->bitrate > txrate->bitrate)
125 break;
126
127 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
128 rate = r->bitrate;
129
130 switch (sband->band) {
131 case IEEE80211_BAND_2GHZ: {
132 u32 flag;
133 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
134 flag = IEEE80211_RATE_MANDATORY_G;
135 else
136 flag = IEEE80211_RATE_MANDATORY_B;
137 if (r->flags & flag)
138 mrate = r->bitrate;
139 break;
140 }
141 case IEEE80211_BAND_5GHZ:
142 if (r->flags & IEEE80211_RATE_MANDATORY_A)
143 mrate = r->bitrate;
144 break;
145 case IEEE80211_NUM_BANDS:
146 WARN_ON(1);
147 break;
148 }
149 }
150 if (rate == -1) {
151
152
153 rate = mrate;
154 }
155
156
157
158
159
160 dur = ieee80211_frame_duration(local, 10, rate, erp,
161 tx->sdata->vif.bss_conf.use_short_preamble);
162
163 if (next_frag_len) {
164
165
166 dur *= 2;
167
168 dur += ieee80211_frame_duration(local, next_frag_len,
169 txrate->bitrate, erp,
170 tx->sdata->vif.bss_conf.use_short_preamble);
171 }
172
173 return cpu_to_le16(dur);
174}
175
176static int inline is_ieee80211_device(struct ieee80211_local *local,
177 struct net_device *dev)
178{
179 return local == wdev_priv(dev->ieee80211_ptr);
180}
181
182
183
184static ieee80211_tx_result debug_noinline
185ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
186{
187
188 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
189 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
190 u32 sta_flags;
191
192 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
193 return TX_CONTINUE;
194
195 if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) &&
196 !ieee80211_is_probe_req(hdr->frame_control) &&
197 !ieee80211_is_nullfunc(hdr->frame_control))
198
199
200
201
202
203
204
205
206
207
208
209 return TX_DROP;
210
211 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
212 return TX_CONTINUE;
213
214 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
215 return TX_CONTINUE;
216
217 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
218
219 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
220 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
221 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
222 ieee80211_is_data(hdr->frame_control))) {
223#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
224 printk(KERN_DEBUG "%s: dropped data frame to not "
225 "associated station %pM\n",
226 tx->dev->name, hdr->addr1);
227#endif
228 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
229 return TX_DROP;
230 }
231 } else {
232 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
233 tx->local->num_sta == 0 &&
234 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
235
236
237
238
239 return TX_DROP;
240 }
241 return TX_CONTINUE;
242 }
243
244 return TX_CONTINUE;
245}
246
247
248
249
250
251static void purge_old_ps_buffers(struct ieee80211_local *local)
252{
253 int total = 0, purged = 0;
254 struct sk_buff *skb;
255 struct ieee80211_sub_if_data *sdata;
256 struct sta_info *sta;
257
258
259
260
261 rcu_read_lock();
262
263 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
264 struct ieee80211_if_ap *ap;
265 if (sdata->vif.type != NL80211_IFTYPE_AP)
266 continue;
267 ap = &sdata->u.ap;
268 skb = skb_dequeue(&ap->ps_bc_buf);
269 if (skb) {
270 purged++;
271 dev_kfree_skb(skb);
272 }
273 total += skb_queue_len(&ap->ps_bc_buf);
274 }
275
276 list_for_each_entry_rcu(sta, &local->sta_list, list) {
277 skb = skb_dequeue(&sta->ps_tx_buf);
278 if (skb) {
279 purged++;
280 dev_kfree_skb(skb);
281 }
282 total += skb_queue_len(&sta->ps_tx_buf);
283 }
284
285 rcu_read_unlock();
286
287 local->total_ps_buffered = total;
288#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
289 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
290 wiphy_name(local->hw.wiphy), purged);
291#endif
292}
293
294static ieee80211_tx_result
295ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
296{
297 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
298 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
299
300
301
302
303
304
305
306
307
308
309 if (!tx->sdata->bss)
310 return TX_CONTINUE;
311
312
313 if (ieee80211_has_order(hdr->frame_control))
314 return TX_CONTINUE;
315
316
317 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
318 return TX_CONTINUE;
319
320
321 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) {
322 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
323
324 return TX_CONTINUE;
325 }
326
327
328 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
329 purge_old_ps_buffers(tx->local);
330
331 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
332#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
333 if (net_ratelimit())
334 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
335 tx->dev->name);
336#endif
337 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
338 } else
339 tx->local->total_ps_buffered++;
340
341 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
342
343 return TX_QUEUED;
344}
345
346static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
347 struct sk_buff *skb)
348{
349 if (!ieee80211_is_mgmt(fc))
350 return 0;
351
352 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
353 return 0;
354
355 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
356 skb->data))
357 return 0;
358
359 return 1;
360}
361
362static ieee80211_tx_result
363ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
364{
365 struct sta_info *sta = tx->sta;
366 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
368 u32 staflags;
369
370 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)
371 || ieee80211_is_auth(hdr->frame_control)
372 || ieee80211_is_assoc_resp(hdr->frame_control)
373 || ieee80211_is_reassoc_resp(hdr->frame_control)))
374 return TX_CONTINUE;
375
376 staflags = get_sta_flags(sta);
377
378 if (unlikely((staflags & WLAN_STA_PS) &&
379 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
380#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
381 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
382 "before %d)\n",
383 sta->sta.addr, sta->sta.aid,
384 skb_queue_len(&sta->ps_tx_buf));
385#endif
386 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
387 purge_old_ps_buffers(tx->local);
388 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
389 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
390#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
391 if (net_ratelimit()) {
392 printk(KERN_DEBUG "%s: STA %pM TX "
393 "buffer full - dropping oldest frame\n",
394 tx->dev->name, sta->sta.addr);
395 }
396#endif
397 dev_kfree_skb(old);
398 } else
399 tx->local->total_ps_buffered++;
400
401
402 if (skb_queue_empty(&sta->ps_tx_buf))
403 sta_info_set_tim_bit(sta);
404
405 info->control.jiffies = jiffies;
406 info->control.vif = &tx->sdata->vif;
407 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
408 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
409 return TX_QUEUED;
410 }
411#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
412 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
413 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
414 "set -> send frame\n", tx->dev->name,
415 sta->sta.addr);
416 }
417#endif
418
419 return TX_CONTINUE;
420}
421
422static ieee80211_tx_result debug_noinline
423ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
424{
425 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
426 return TX_CONTINUE;
427
428 if (tx->flags & IEEE80211_TX_UNICAST)
429 return ieee80211_tx_h_unicast_ps_buf(tx);
430 else
431 return ieee80211_tx_h_multicast_ps_buf(tx);
432}
433
434static ieee80211_tx_result debug_noinline
435ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
436{
437 struct ieee80211_key *key = NULL;
438 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
439 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
440
441 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
442 tx->key = NULL;
443 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
444 tx->key = key;
445 else if (ieee80211_is_mgmt(hdr->frame_control) &&
446 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
447 tx->key = key;
448 else if ((key = rcu_dereference(tx->sdata->default_key)))
449 tx->key = key;
450 else if (tx->sdata->drop_unencrypted &&
451 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
452 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
453 (!ieee80211_is_robust_mgmt_frame(hdr) ||
454 (ieee80211_is_action(hdr->frame_control) &&
455 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
456 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
457 return TX_DROP;
458 } else
459 tx->key = NULL;
460
461 if (tx->key) {
462 tx->key->tx_rx_count++;
463
464
465 switch (tx->key->conf.alg) {
466 case ALG_WEP:
467 if (ieee80211_is_auth(hdr->frame_control))
468 break;
469 case ALG_TKIP:
470 if (!ieee80211_is_data_present(hdr->frame_control))
471 tx->key = NULL;
472 break;
473 case ALG_CCMP:
474 if (!ieee80211_is_data_present(hdr->frame_control) &&
475 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
476 tx->skb))
477 tx->key = NULL;
478 break;
479 case ALG_AES_CMAC:
480 if (!ieee80211_is_mgmt(hdr->frame_control))
481 tx->key = NULL;
482 break;
483 }
484 }
485
486 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
487 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
488
489 return TX_CONTINUE;
490}
491
492static ieee80211_tx_result debug_noinline
493ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
494{
495 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
496 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
497 struct ieee80211_supported_band *sband;
498 struct ieee80211_rate *rate;
499 int i, len;
500 bool inval = false, rts = false, short_preamble = false;
501 struct ieee80211_tx_rate_control txrc;
502 u32 sta_flags;
503
504 memset(&txrc, 0, sizeof(txrc));
505
506 sband = tx->local->hw.wiphy->bands[tx->channel->band];
507
508 len = min_t(int, tx->skb->len + FCS_LEN,
509 tx->local->hw.wiphy->frag_threshold);
510
511
512 txrc.hw = local_to_hw(tx->local);
513 txrc.sband = sband;
514 txrc.bss_conf = &tx->sdata->vif.bss_conf;
515 txrc.skb = tx->skb;
516 txrc.reported_rate.idx = -1;
517 txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
518
519
520 if (len > tx->local->hw.wiphy->rts_threshold) {
521 txrc.rts = rts = true;
522 }
523
524
525
526
527
528
529
530 if (tx->sdata->vif.bss_conf.use_short_preamble &&
531 (ieee80211_is_data(hdr->frame_control) ||
532 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
533 txrc.short_preamble = short_preamble = true;
534
535 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
536
537
538
539
540
541 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
542 (sta_flags & WLAN_STA_ASSOC) &&
543 !rate_usable_index_exists(sband, &tx->sta->sta),
544 "%s: Dropped data frame as no usable bitrate found while "
545 "scanning and associated. Target station: "
546 "%pM on %d GHz band\n",
547 tx->dev->name, hdr->addr1,
548 tx->channel->band ? 5 : 2))
549 return TX_DROP;
550
551
552
553
554
555 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
556
557 if (unlikely(info->control.rates[0].idx < 0))
558 return TX_DROP;
559
560 if (txrc.reported_rate.idx < 0)
561 txrc.reported_rate = info->control.rates[0];
562
563 if (tx->sta)
564 tx->sta->last_tx_rate = txrc.reported_rate;
565
566 if (unlikely(!info->control.rates[0].count))
567 info->control.rates[0].count = 1;
568
569 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
570 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
571 info->control.rates[0].count = 1;
572
573 if (is_multicast_ether_addr(hdr->addr1)) {
574
575
576
577 return TX_CONTINUE;
578 }
579
580
581
582
583
584
585
586 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
587 s8 baserate = 0;
588
589 rate = &sband->bitrates[info->control.rates[0].idx];
590
591 for (i = 0; i < sband->n_bitrates; i++) {
592
593 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
594 continue;
595
596 if (sband->bitrates[i].bitrate > rate->bitrate)
597 continue;
598
599 if (sband->bitrates[baserate].bitrate <
600 sband->bitrates[i].bitrate)
601 baserate = i;
602 }
603
604 info->control.rts_cts_rate_idx = baserate;
605 }
606
607 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
608
609
610
611
612
613 if (inval) {
614 info->control.rates[i].idx = -1;
615 continue;
616 }
617 if (info->control.rates[i].idx < 0) {
618 inval = true;
619 continue;
620 }
621
622
623
624
625
626 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
627 WARN_ON(info->control.rates[i].idx > 76);
628 continue;
629 }
630
631
632 if (rts)
633 info->control.rates[i].flags |=
634 IEEE80211_TX_RC_USE_RTS_CTS;
635
636
637 if (WARN_ON_ONCE(info->control.rates[i].idx >=
638 sband->n_bitrates)) {
639 info->control.rates[i].idx = -1;
640 continue;
641 }
642
643 rate = &sband->bitrates[info->control.rates[i].idx];
644
645
646 if (short_preamble &&
647 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
648 info->control.rates[i].flags |=
649 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
650
651
652 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
653 rate->flags & IEEE80211_RATE_ERP_G)
654 info->control.rates[i].flags |=
655 IEEE80211_TX_RC_USE_CTS_PROTECT;
656 }
657
658 return TX_CONTINUE;
659}
660
661static ieee80211_tx_result debug_noinline
662ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
663{
664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665
666 if (tx->sta)
667 info->control.sta = &tx->sta->sta;
668
669 return TX_CONTINUE;
670}
671
672static ieee80211_tx_result debug_noinline
673ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
674{
675 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
677 u16 *seq;
678 u8 *qc;
679 int tid;
680
681
682
683
684
685
686 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
687 return TX_CONTINUE;
688
689 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
690 return TX_CONTINUE;
691
692 if (ieee80211_hdrlen(hdr->frame_control) < 24)
693 return TX_CONTINUE;
694
695
696
697
698
699
700 if (!ieee80211_is_data_qos(hdr->frame_control)) {
701
702 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
703
704 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
705 tx->sdata->sequence_number += 0x10;
706 return TX_CONTINUE;
707 }
708
709
710
711
712
713
714 if (!tx->sta)
715 return TX_CONTINUE;
716
717
718
719 qc = ieee80211_get_qos_ctl(hdr);
720 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
721 seq = &tx->sta->tid_seq[tid];
722
723 hdr->seq_ctrl = cpu_to_le16(*seq);
724
725
726 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
727
728 return TX_CONTINUE;
729}
730
731static int ieee80211_fragment(struct ieee80211_local *local,
732 struct sk_buff *skb, int hdrlen,
733 int frag_threshold)
734{
735 struct sk_buff *tail = skb, *tmp;
736 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
737 int pos = hdrlen + per_fragm;
738 int rem = skb->len - hdrlen - per_fragm;
739
740 if (WARN_ON(rem < 0))
741 return -EINVAL;
742
743 while (rem) {
744 int fraglen = per_fragm;
745
746 if (fraglen > rem)
747 fraglen = rem;
748 rem -= fraglen;
749 tmp = dev_alloc_skb(local->tx_headroom +
750 frag_threshold +
751 IEEE80211_ENCRYPT_HEADROOM +
752 IEEE80211_ENCRYPT_TAILROOM);
753 if (!tmp)
754 return -ENOMEM;
755 tail->next = tmp;
756 tail = tmp;
757 skb_reserve(tmp, local->tx_headroom +
758 IEEE80211_ENCRYPT_HEADROOM);
759
760 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
761 skb_copy_queue_mapping(tmp, skb);
762 tmp->priority = skb->priority;
763 tmp->dev = skb->dev;
764
765
766 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
767 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
768
769 pos += fraglen;
770 }
771
772 skb->len = hdrlen + per_fragm;
773 return 0;
774}
775
776static ieee80211_tx_result debug_noinline
777ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
778{
779 struct sk_buff *skb = tx->skb;
780 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
781 struct ieee80211_hdr *hdr = (void *)skb->data;
782 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
783 int hdrlen;
784 int fragnum;
785
786 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
787 return TX_CONTINUE;
788
789
790
791
792
793
794 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
795 return TX_DROP;
796
797 hdrlen = ieee80211_hdrlen(hdr->frame_control);
798
799
800 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
801 return TX_DROP;
802
803
804
805
806
807
808
809
810
811 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
812 return TX_DROP;
813
814
815 fragnum = 0;
816 do {
817 int next_len;
818 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
819
820 hdr = (void *)skb->data;
821 info = IEEE80211_SKB_CB(skb);
822
823 if (skb->next) {
824 hdr->frame_control |= morefrags;
825 next_len = skb->next->len;
826
827
828
829
830 info->control.rates[1].idx = -1;
831 info->control.rates[2].idx = -1;
832 info->control.rates[3].idx = -1;
833 info->control.rates[4].idx = -1;
834 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
835 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
836 } else {
837 hdr->frame_control &= ~morefrags;
838 next_len = 0;
839 }
840 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
841 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
842 fragnum++;
843 } while ((skb = skb->next));
844
845 return TX_CONTINUE;
846}
847
848static ieee80211_tx_result debug_noinline
849ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
850{
851 struct sk_buff *skb = tx->skb;
852
853 if (!tx->sta)
854 return TX_CONTINUE;
855
856 tx->sta->tx_packets++;
857 do {
858 tx->sta->tx_fragments++;
859 tx->sta->tx_bytes += skb->len;
860 } while ((skb = skb->next));
861
862 return TX_CONTINUE;
863}
864
865static ieee80211_tx_result debug_noinline
866ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
867{
868 if (!tx->key)
869 return TX_CONTINUE;
870
871 switch (tx->key->conf.alg) {
872 case ALG_WEP:
873 return ieee80211_crypto_wep_encrypt(tx);
874 case ALG_TKIP:
875 return ieee80211_crypto_tkip_encrypt(tx);
876 case ALG_CCMP:
877 return ieee80211_crypto_ccmp_encrypt(tx);
878 case ALG_AES_CMAC:
879 return ieee80211_crypto_aes_cmac_encrypt(tx);
880 }
881
882
883 WARN_ON(1);
884 return TX_DROP;
885}
886
887static ieee80211_tx_result debug_noinline
888ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
889{
890 struct sk_buff *skb = tx->skb;
891 struct ieee80211_hdr *hdr;
892 int next_len;
893 bool group_addr;
894
895 do {
896 hdr = (void *) skb->data;
897 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
898 break;
899 next_len = skb->next ? skb->next->len : 0;
900 group_addr = is_multicast_ether_addr(hdr->addr1);
901
902 hdr->duration_id =
903 ieee80211_duration(tx, group_addr, next_len);
904 } while ((skb = skb->next));
905
906 return TX_CONTINUE;
907}
908
909
910
911
912
913
914
915static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
916 struct sk_buff *skb)
917{
918
919
920
921
922
923
924
925
926 struct ieee80211_radiotap_iterator iterator;
927 struct ieee80211_radiotap_header *rthdr =
928 (struct ieee80211_radiotap_header *) skb->data;
929 struct ieee80211_supported_band *sband;
930 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
931 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
932
933 sband = tx->local->hw.wiphy->bands[tx->channel->band];
934
935 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
936 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
937
938
939
940
941
942
943
944 while (!ret) {
945 ret = ieee80211_radiotap_iterator_next(&iterator);
946
947 if (ret)
948 continue;
949
950
951 switch (iterator.this_arg_index) {
952
953
954
955
956
957
958 case IEEE80211_RADIOTAP_FLAGS:
959 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
960
961
962
963
964
965
966
967 if (skb->len < (iterator.max_length + FCS_LEN))
968 return false;
969
970 skb_trim(skb, skb->len - FCS_LEN);
971 }
972 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
973 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
974 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
975 tx->flags |= IEEE80211_TX_FRAGMENTED;
976 break;
977
978
979
980
981
982
983
984 default:
985 break;
986 }
987 }
988
989 if (ret != -ENOENT)
990 return false;
991
992
993
994
995
996
997 skb_pull(skb, iterator.max_length);
998
999 return true;
1000}
1001
1002
1003
1004
1005static ieee80211_tx_result
1006ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1007 struct ieee80211_tx_data *tx,
1008 struct sk_buff *skb)
1009{
1010 struct ieee80211_local *local = sdata->local;
1011 struct ieee80211_hdr *hdr;
1012 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1013 int hdrlen, tid;
1014 u8 *qc, *state;
1015 bool queued = false;
1016
1017 memset(tx, 0, sizeof(*tx));
1018 tx->skb = skb;
1019 tx->dev = sdata->dev;
1020 tx->local = local;
1021 tx->sdata = sdata;
1022 tx->channel = local->hw.conf.channel;
1023
1024
1025
1026
1027 tx->flags |= IEEE80211_TX_FRAGMENTED;
1028
1029
1030 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
1031 if (!__ieee80211_parse_tx_radiotap(tx, skb))
1032 return TX_DROP;
1033
1034
1035
1036
1037
1038
1039 }
1040
1041
1042
1043
1044
1045
1046 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1047
1048 hdr = (struct ieee80211_hdr *) skb->data;
1049
1050 tx->sta = sta_info_get(local, hdr->addr1);
1051
1052 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1053 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1054 unsigned long flags;
1055 struct tid_ampdu_tx *tid_tx;
1056
1057 qc = ieee80211_get_qos_ctl(hdr);
1058 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1059
1060 spin_lock_irqsave(&tx->sta->lock, flags);
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1075 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1076 if (*state == HT_AGG_STATE_OPERATIONAL) {
1077 info->flags |= IEEE80211_TX_CTL_AMPDU;
1078 } else if (*state != HT_AGG_STATE_IDLE) {
1079
1080 queued = true;
1081 info->control.vif = &sdata->vif;
1082 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1083 __skb_queue_tail(&tid_tx->pending, skb);
1084 }
1085 spin_unlock_irqrestore(&tx->sta->lock, flags);
1086
1087 if (unlikely(queued))
1088 return TX_QUEUED;
1089 }
1090
1091 if (is_multicast_ether_addr(hdr->addr1)) {
1092 tx->flags &= ~IEEE80211_TX_UNICAST;
1093 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1094 } else {
1095 tx->flags |= IEEE80211_TX_UNICAST;
1096 if (unlikely(local->wifi_wme_noack_test))
1097 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1098 else
1099 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1100 }
1101
1102 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1103 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1104 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1105 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1106 tx->flags |= IEEE80211_TX_FRAGMENTED;
1107 else
1108 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1109 }
1110
1111 if (!tx->sta)
1112 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1113 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1114 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1115
1116 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1117 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1118 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1119 tx->ethertype = (pos[0] << 8) | pos[1];
1120 }
1121 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1122
1123 return TX_CONTINUE;
1124}
1125
1126static int __ieee80211_tx(struct ieee80211_local *local,
1127 struct sk_buff **skbp,
1128 struct sta_info *sta,
1129 bool txpending)
1130{
1131 struct sk_buff *skb = *skbp, *next;
1132 struct ieee80211_tx_info *info;
1133 struct ieee80211_sub_if_data *sdata;
1134 unsigned long flags;
1135 int ret, len;
1136 bool fragm = false;
1137
1138 while (skb) {
1139 int q = skb_get_queue_mapping(skb);
1140
1141 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1142 ret = IEEE80211_TX_OK;
1143 if (local->queue_stop_reasons[q] ||
1144 (!txpending && !skb_queue_empty(&local->pending[q])))
1145 ret = IEEE80211_TX_PENDING;
1146 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1147 if (ret != IEEE80211_TX_OK)
1148 return ret;
1149
1150 info = IEEE80211_SKB_CB(skb);
1151
1152 if (fragm)
1153 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1154 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1155
1156 next = skb->next;
1157 len = skb->len;
1158
1159 if (next)
1160 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1161
1162 sdata = vif_to_sdata(info->control.vif);
1163
1164 switch (sdata->vif.type) {
1165 case NL80211_IFTYPE_MONITOR:
1166 info->control.vif = NULL;
1167 break;
1168 case NL80211_IFTYPE_AP_VLAN:
1169 info->control.vif = &container_of(sdata->bss,
1170 struct ieee80211_sub_if_data, u.ap)->vif;
1171 break;
1172 default:
1173
1174 break;
1175 }
1176
1177 ret = drv_tx(local, skb);
1178 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1179 dev_kfree_skb(skb);
1180 ret = NETDEV_TX_OK;
1181 }
1182 if (ret != NETDEV_TX_OK) {
1183 info->control.vif = &sdata->vif;
1184 return IEEE80211_TX_AGAIN;
1185 }
1186
1187 *skbp = skb = next;
1188 ieee80211_led_tx(local, 1);
1189 fragm = true;
1190 }
1191
1192 return IEEE80211_TX_OK;
1193}
1194
1195
1196
1197
1198
1199static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1200{
1201 struct sk_buff *skb = tx->skb;
1202 ieee80211_tx_result res = TX_DROP;
1203
1204#define CALL_TXH(txh) \
1205 res = txh(tx); \
1206 if (res != TX_CONTINUE) \
1207 goto txh_done;
1208
1209 CALL_TXH(ieee80211_tx_h_check_assoc)
1210 CALL_TXH(ieee80211_tx_h_ps_buf)
1211 CALL_TXH(ieee80211_tx_h_select_key)
1212 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1213 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1214 CALL_TXH(ieee80211_tx_h_misc)
1215 CALL_TXH(ieee80211_tx_h_sequence)
1216 CALL_TXH(ieee80211_tx_h_fragment)
1217
1218 CALL_TXH(ieee80211_tx_h_stats)
1219 CALL_TXH(ieee80211_tx_h_encrypt)
1220 CALL_TXH(ieee80211_tx_h_calculate_duration)
1221#undef CALL_TXH
1222
1223 txh_done:
1224 if (unlikely(res == TX_DROP)) {
1225 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1226 while (skb) {
1227 struct sk_buff *next;
1228
1229 next = skb->next;
1230 dev_kfree_skb(skb);
1231 skb = next;
1232 }
1233 return -1;
1234 } else if (unlikely(res == TX_QUEUED)) {
1235 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1236 return -1;
1237 }
1238
1239 return 0;
1240}
1241
1242static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1243 struct sk_buff *skb, bool txpending)
1244{
1245 struct ieee80211_local *local = sdata->local;
1246 struct ieee80211_tx_data tx;
1247 ieee80211_tx_result res_prepare;
1248 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1249 struct sk_buff *next;
1250 unsigned long flags;
1251 int ret, retries;
1252 u16 queue;
1253
1254 queue = skb_get_queue_mapping(skb);
1255
1256 if (unlikely(skb->len < 10)) {
1257 dev_kfree_skb(skb);
1258 return;
1259 }
1260
1261 rcu_read_lock();
1262
1263
1264 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1265
1266 if (unlikely(res_prepare == TX_DROP)) {
1267 dev_kfree_skb(skb);
1268 rcu_read_unlock();
1269 return;
1270 } else if (unlikely(res_prepare == TX_QUEUED)) {
1271 rcu_read_unlock();
1272 return;
1273 }
1274
1275 tx.channel = local->hw.conf.channel;
1276 info->band = tx.channel->band;
1277
1278 if (invoke_tx_handlers(&tx))
1279 goto out;
1280
1281 retries = 0;
1282 retry:
1283 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1284 switch (ret) {
1285 case IEEE80211_TX_OK:
1286 break;
1287 case IEEE80211_TX_AGAIN:
1288
1289
1290
1291
1292
1293 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1294 goto drop;
1295
1296 case IEEE80211_TX_PENDING:
1297 skb = tx.skb;
1298
1299 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1300
1301 if (local->queue_stop_reasons[queue] ||
1302 !skb_queue_empty(&local->pending[queue])) {
1303
1304
1305
1306
1307 do {
1308 next = skb->next;
1309 skb->next = NULL;
1310 if (unlikely(txpending))
1311 __skb_queue_head(&local->pending[queue],
1312 skb);
1313 else
1314 __skb_queue_tail(&local->pending[queue],
1315 skb);
1316 } while ((skb = next));
1317
1318 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1319 flags);
1320 } else {
1321
1322
1323
1324
1325 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1326 flags);
1327
1328 retries++;
1329 if (WARN(retries > 10, "tx refused but queue active\n"))
1330 goto drop;
1331 goto retry;
1332 }
1333 }
1334 out:
1335 rcu_read_unlock();
1336 return;
1337
1338 drop:
1339 rcu_read_unlock();
1340
1341 skb = tx.skb;
1342 while (skb) {
1343 next = skb->next;
1344 dev_kfree_skb(skb);
1345 skb = next;
1346 }
1347}
1348
1349
1350
1351static int ieee80211_skb_resize(struct ieee80211_local *local,
1352 struct sk_buff *skb,
1353 int head_need, bool may_encrypt)
1354{
1355 int tail_need = 0;
1356
1357
1358
1359
1360
1361
1362 if (may_encrypt) {
1363 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1364 tail_need -= skb_tailroom(skb);
1365 tail_need = max_t(int, tail_need, 0);
1366 }
1367
1368 if (head_need || tail_need) {
1369
1370 skb_orphan(skb);
1371 }
1372
1373 if (skb_header_cloned(skb))
1374 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1375 else
1376 I802_DEBUG_INC(local->tx_expand_skb_head);
1377
1378 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1379 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1380 wiphy_name(local->hw.wiphy));
1381 return -ENOMEM;
1382 }
1383
1384
1385 skb->truesize += head_need + tail_need;
1386
1387 return 0;
1388}
1389
1390static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1391 struct sk_buff *skb)
1392{
1393 struct ieee80211_local *local = sdata->local;
1394 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1395 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1396 struct ieee80211_sub_if_data *tmp_sdata;
1397 int headroom;
1398 bool may_encrypt;
1399
1400 dev_hold(sdata->dev);
1401
1402 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1403 local->hw.conf.dynamic_ps_timeout > 0 &&
1404 !(local->scanning) && local->ps_sdata) {
1405 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1406 ieee80211_stop_queues_by_reason(&local->hw,
1407 IEEE80211_QUEUE_STOP_REASON_PS);
1408 ieee80211_queue_work(&local->hw,
1409 &local->dynamic_ps_disable_work);
1410 }
1411
1412 mod_timer(&local->dynamic_ps_timer, jiffies +
1413 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1414 }
1415
1416 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1417
1418 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1419 int hdrlen;
1420 u16 len_rthdr;
1421
1422 info->flags |= IEEE80211_TX_CTL_INJECTED;
1423
1424 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1425 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1426 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1427
1428
1429 if (likely(skb->len >= len_rthdr + hdrlen)) {
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440 rcu_read_lock();
1441 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1442 list) {
1443 if (!netif_running(tmp_sdata->dev))
1444 continue;
1445 if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
1446 continue;
1447 if (compare_ether_addr(tmp_sdata->dev->dev_addr,
1448 hdr->addr2) == 0) {
1449 dev_hold(tmp_sdata->dev);
1450 dev_put(sdata->dev);
1451 sdata = tmp_sdata;
1452 break;
1453 }
1454 }
1455 rcu_read_unlock();
1456 }
1457 }
1458
1459 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1460
1461 headroom = local->tx_headroom;
1462 if (may_encrypt)
1463 headroom += IEEE80211_ENCRYPT_HEADROOM;
1464 headroom -= skb_headroom(skb);
1465 headroom = max_t(int, 0, headroom);
1466
1467 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1468 dev_kfree_skb(skb);
1469 dev_put(sdata->dev);
1470 return;
1471 }
1472
1473 info->control.vif = &sdata->vif;
1474
1475 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1476 ieee80211_is_data(hdr->frame_control) &&
1477 !is_multicast_ether_addr(hdr->addr1))
1478 if (mesh_nexthop_lookup(skb, sdata)) {
1479
1480 dev_put(sdata->dev);
1481 return;
1482 }
1483
1484 ieee80211_select_queue(local, skb);
1485 ieee80211_tx(sdata, skb, false);
1486 dev_put(sdata->dev);
1487}
1488
1489netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1490 struct net_device *dev)
1491{
1492 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1493 struct ieee80211_channel *chan = local->hw.conf.channel;
1494 struct ieee80211_radiotap_header *prthdr =
1495 (struct ieee80211_radiotap_header *)skb->data;
1496 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1497 u16 len_rthdr;
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1516 IEEE80211_CHAN_PASSIVE_SCAN)))
1517 goto fail;
1518
1519
1520 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1521 goto fail;
1522
1523
1524 if (unlikely(prthdr->it_version))
1525 goto fail;
1526
1527
1528 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1529
1530
1531 if (unlikely(skb->len < len_rthdr))
1532 goto fail;
1533
1534
1535
1536
1537
1538
1539
1540 skb_set_mac_header(skb, len_rthdr);
1541
1542
1543
1544
1545 skb_set_network_header(skb, len_rthdr);
1546 skb_set_transport_header(skb, len_rthdr);
1547
1548 memset(info, 0, sizeof(*info));
1549
1550
1551 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1552 return NETDEV_TX_OK;
1553
1554fail:
1555 dev_kfree_skb(skb);
1556 return NETDEV_TX_OK;
1557}
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1575 struct net_device *dev)
1576{
1577 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1578 struct ieee80211_local *local = sdata->local;
1579 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1580 int ret = NETDEV_TX_BUSY, head_need;
1581 u16 ethertype, hdrlen, meshhdrlen = 0;
1582 __le16 fc;
1583 struct ieee80211_hdr hdr;
1584 struct ieee80211s_hdr mesh_hdr;
1585 const u8 *encaps_data;
1586 int encaps_len, skip_header_bytes;
1587 int nh_pos, h_pos;
1588 struct sta_info *sta;
1589 u32 sta_flags = 0;
1590
1591 if (unlikely(skb->len < ETH_HLEN)) {
1592 ret = NETDEV_TX_OK;
1593 goto fail;
1594 }
1595
1596 nh_pos = skb_network_header(skb) - skb->data;
1597 h_pos = skb_transport_header(skb) - skb->data;
1598
1599
1600
1601 ethertype = (skb->data[12] << 8) | skb->data[13];
1602 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1603
1604 switch (sdata->vif.type) {
1605 case NL80211_IFTYPE_AP:
1606 case NL80211_IFTYPE_AP_VLAN:
1607 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1608
1609 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1610 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1611 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1612 hdrlen = 24;
1613 break;
1614 case NL80211_IFTYPE_WDS:
1615 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1616
1617 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1618 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1619 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1620 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1621 hdrlen = 30;
1622 break;
1623#ifdef CONFIG_MAC80211_MESH
1624 case NL80211_IFTYPE_MESH_POINT:
1625 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1626
1627 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1628 ret = NETDEV_TX_OK;
1629 goto fail;
1630 }
1631
1632 if (compare_ether_addr(dev->dev_addr,
1633 skb->data + ETH_ALEN) == 0) {
1634 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1635 skb->data, skb->data + ETH_ALEN);
1636 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1637 sdata, NULL, NULL, NULL);
1638 } else {
1639
1640 struct mesh_path *mppath;
1641 int is_mesh_mcast = 1;
1642 char *mesh_da;
1643
1644 rcu_read_lock();
1645 if (is_multicast_ether_addr(skb->data))
1646
1647 mesh_da = skb->data;
1648 else {
1649 mppath = mpp_path_lookup(skb->data, sdata);
1650 if (mppath) {
1651
1652 mesh_da = mppath->mpp;
1653 is_mesh_mcast = 0;
1654 } else
1655
1656 mesh_da = dev->broadcast;
1657 }
1658 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1659 mesh_da, dev->dev_addr);
1660 rcu_read_unlock();
1661 if (is_mesh_mcast)
1662 meshhdrlen =
1663 ieee80211_new_mesh_header(&mesh_hdr,
1664 sdata,
1665 skb->data + ETH_ALEN,
1666 NULL,
1667 NULL);
1668 else
1669 meshhdrlen =
1670 ieee80211_new_mesh_header(&mesh_hdr,
1671 sdata,
1672 NULL,
1673 skb->data,
1674 skb->data + ETH_ALEN);
1675
1676 }
1677 break;
1678#endif
1679 case NL80211_IFTYPE_STATION:
1680 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1681
1682 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1683 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1684 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1685 hdrlen = 24;
1686 break;
1687 case NL80211_IFTYPE_ADHOC:
1688
1689 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1690 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1691 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1692 hdrlen = 24;
1693 break;
1694 default:
1695 ret = NETDEV_TX_OK;
1696 goto fail;
1697 }
1698
1699
1700
1701
1702
1703
1704 if (!is_multicast_ether_addr(hdr.addr1)) {
1705 rcu_read_lock();
1706 sta = sta_info_get(local, hdr.addr1);
1707
1708 if (sta && sta->sdata == sdata)
1709 sta_flags = get_sta_flags(sta);
1710 rcu_read_unlock();
1711 }
1712
1713
1714 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1715 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1716 hdrlen += 2;
1717 }
1718
1719
1720
1721
1722
1723 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1724 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1725 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1726 !(ethertype == ETH_P_PAE &&
1727 compare_ether_addr(dev->dev_addr,
1728 skb->data + ETH_ALEN) == 0))) {
1729#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1730 if (net_ratelimit())
1731 printk(KERN_DEBUG "%s: dropped frame to %pM"
1732 " (unauthorized port)\n", dev->name,
1733 hdr.addr1);
1734#endif
1735
1736 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1737
1738 ret = NETDEV_TX_OK;
1739 goto fail;
1740 }
1741
1742 hdr.frame_control = fc;
1743 hdr.duration_id = 0;
1744 hdr.seq_ctrl = 0;
1745
1746 skip_header_bytes = ETH_HLEN;
1747 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1748 encaps_data = bridge_tunnel_header;
1749 encaps_len = sizeof(bridge_tunnel_header);
1750 skip_header_bytes -= 2;
1751 } else if (ethertype >= 0x600) {
1752 encaps_data = rfc1042_header;
1753 encaps_len = sizeof(rfc1042_header);
1754 skip_header_bytes -= 2;
1755 } else {
1756 encaps_data = NULL;
1757 encaps_len = 0;
1758 }
1759
1760 skb_pull(skb, skip_header_bytes);
1761 nh_pos -= skip_header_bytes;
1762 h_pos -= skip_header_bytes;
1763
1764 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778 if (head_need > 0 || skb_cloned(skb)) {
1779 head_need += IEEE80211_ENCRYPT_HEADROOM;
1780 head_need += local->tx_headroom;
1781 head_need = max_t(int, 0, head_need);
1782 if (ieee80211_skb_resize(local, skb, head_need, true))
1783 goto fail;
1784 }
1785
1786 if (encaps_data) {
1787 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1788 nh_pos += encaps_len;
1789 h_pos += encaps_len;
1790 }
1791
1792 if (meshhdrlen > 0) {
1793 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1794 nh_pos += meshhdrlen;
1795 h_pos += meshhdrlen;
1796 }
1797
1798 if (ieee80211_is_data_qos(fc)) {
1799 __le16 *qos_control;
1800
1801 qos_control = (__le16*) skb_push(skb, 2);
1802 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1803
1804
1805
1806
1807 *qos_control = 0;
1808 } else
1809 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1810
1811 nh_pos += hdrlen;
1812 h_pos += hdrlen;
1813
1814 dev->stats.tx_packets++;
1815 dev->stats.tx_bytes += skb->len;
1816
1817
1818
1819
1820 skb_set_mac_header(skb, 0);
1821 skb_set_network_header(skb, nh_pos);
1822 skb_set_transport_header(skb, h_pos);
1823
1824 memset(info, 0, sizeof(*info));
1825
1826 dev->trans_start = jiffies;
1827 ieee80211_xmit(sdata, skb);
1828
1829 return NETDEV_TX_OK;
1830
1831 fail:
1832 if (ret == NETDEV_TX_OK)
1833 dev_kfree_skb(skb);
1834
1835 return ret;
1836}
1837
1838
1839
1840
1841
1842
1843void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1844{
1845 int i;
1846
1847 for (i = 0; i < local->hw.queues; i++)
1848 skb_queue_purge(&local->pending[i]);
1849}
1850
1851static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
1852 struct sk_buff *skb)
1853{
1854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1855 struct ieee80211_sub_if_data *sdata;
1856 struct sta_info *sta;
1857 struct ieee80211_hdr *hdr;
1858 int ret;
1859 bool result = true;
1860
1861 sdata = vif_to_sdata(info->control.vif);
1862
1863 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
1864 ieee80211_tx(sdata, skb, true);
1865 } else {
1866 hdr = (struct ieee80211_hdr *)skb->data;
1867 sta = sta_info_get(local, hdr->addr1);
1868
1869 ret = __ieee80211_tx(local, &skb, sta, true);
1870 if (ret != IEEE80211_TX_OK)
1871 result = false;
1872 }
1873
1874 return result;
1875}
1876
1877
1878
1879
1880void ieee80211_tx_pending(unsigned long data)
1881{
1882 struct ieee80211_local *local = (struct ieee80211_local *)data;
1883 unsigned long flags;
1884 int i;
1885 bool txok;
1886
1887 rcu_read_lock();
1888
1889 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1890 for (i = 0; i < local->hw.queues; i++) {
1891
1892
1893
1894
1895 if (local->queue_stop_reasons[i] ||
1896 skb_queue_empty(&local->pending[i]))
1897 continue;
1898
1899 while (!skb_queue_empty(&local->pending[i])) {
1900 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
1901 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1902 struct ieee80211_sub_if_data *sdata;
1903
1904 if (WARN_ON(!info->control.vif)) {
1905 kfree_skb(skb);
1906 continue;
1907 }
1908
1909 sdata = vif_to_sdata(info->control.vif);
1910 dev_hold(sdata->dev);
1911 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1912 flags);
1913
1914 txok = ieee80211_tx_pending_skb(local, skb);
1915 dev_put(sdata->dev);
1916 if (!txok)
1917 __skb_queue_head(&local->pending[i], skb);
1918 spin_lock_irqsave(&local->queue_stop_reason_lock,
1919 flags);
1920 if (!txok)
1921 break;
1922 }
1923 }
1924 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1925
1926 rcu_read_unlock();
1927}
1928
1929
1930
1931static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
1932 struct sk_buff *skb,
1933 struct beacon_data *beacon)
1934{
1935 u8 *pos, *tim;
1936 int aid0 = 0;
1937 int i, have_bits = 0, n1, n2;
1938
1939
1940
1941 if (atomic_read(&bss->num_sta_ps) > 0)
1942
1943
1944 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1945 IEEE80211_MAX_AID+1);
1946
1947 if (bss->dtim_count == 0)
1948 bss->dtim_count = beacon->dtim_period - 1;
1949 else
1950 bss->dtim_count--;
1951
1952 tim = pos = (u8 *) skb_put(skb, 6);
1953 *pos++ = WLAN_EID_TIM;
1954 *pos++ = 4;
1955 *pos++ = bss->dtim_count;
1956 *pos++ = beacon->dtim_period;
1957
1958 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1959 aid0 = 1;
1960
1961 if (have_bits) {
1962
1963
1964
1965 n1 = 0;
1966 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1967 if (bss->tim[i]) {
1968 n1 = i & 0xfe;
1969 break;
1970 }
1971 }
1972 n2 = n1;
1973 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1974 if (bss->tim[i]) {
1975 n2 = i;
1976 break;
1977 }
1978 }
1979
1980
1981 *pos++ = n1 | aid0;
1982
1983 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1984
1985 tim[1] = n2 - n1 + 4;
1986 skb_put(skb, n2 - n1);
1987 } else {
1988 *pos++ = aid0;
1989 *pos++ = 0;
1990 }
1991}
1992
1993struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1994 struct ieee80211_vif *vif)
1995{
1996 struct ieee80211_local *local = hw_to_local(hw);
1997 struct sk_buff *skb = NULL;
1998 struct ieee80211_tx_info *info;
1999 struct ieee80211_sub_if_data *sdata = NULL;
2000 struct ieee80211_if_ap *ap = NULL;
2001 struct beacon_data *beacon;
2002 struct ieee80211_supported_band *sband;
2003 enum ieee80211_band band = local->hw.conf.channel->band;
2004
2005 sband = local->hw.wiphy->bands[band];
2006
2007 rcu_read_lock();
2008
2009 sdata = vif_to_sdata(vif);
2010
2011 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2012 ap = &sdata->u.ap;
2013 beacon = rcu_dereference(ap->beacon);
2014 if (ap && beacon) {
2015
2016
2017
2018
2019 skb = dev_alloc_skb(local->tx_headroom +
2020 beacon->head_len +
2021 beacon->tail_len + 256);
2022 if (!skb)
2023 goto out;
2024
2025 skb_reserve(skb, local->tx_headroom);
2026 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2027 beacon->head_len);
2028
2029
2030
2031
2032
2033
2034
2035
2036 if (local->tim_in_locked_section) {
2037 ieee80211_beacon_add_tim(ap, skb, beacon);
2038 } else {
2039 unsigned long flags;
2040
2041 spin_lock_irqsave(&local->sta_lock, flags);
2042 ieee80211_beacon_add_tim(ap, skb, beacon);
2043 spin_unlock_irqrestore(&local->sta_lock, flags);
2044 }
2045
2046 if (beacon->tail)
2047 memcpy(skb_put(skb, beacon->tail_len),
2048 beacon->tail, beacon->tail_len);
2049 } else
2050 goto out;
2051 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2052 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2053 struct ieee80211_hdr *hdr;
2054 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2055
2056 if (!presp)
2057 goto out;
2058
2059 skb = skb_copy(presp, GFP_ATOMIC);
2060 if (!skb)
2061 goto out;
2062
2063 hdr = (struct ieee80211_hdr *) skb->data;
2064 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2065 IEEE80211_STYPE_BEACON);
2066 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2067 struct ieee80211_mgmt *mgmt;
2068 u8 *pos;
2069
2070
2071 skb = dev_alloc_skb(local->tx_headroom + 400);
2072 if (!skb)
2073 goto out;
2074
2075 skb_reserve(skb, local->hw.extra_tx_headroom);
2076 mgmt = (struct ieee80211_mgmt *)
2077 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2078 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2079 mgmt->frame_control =
2080 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2081 memset(mgmt->da, 0xff, ETH_ALEN);
2082 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2083
2084 mgmt->u.beacon.beacon_int =
2085 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2086 mgmt->u.beacon.capab_info = 0x0;
2087
2088 pos = skb_put(skb, 2);
2089 *pos++ = WLAN_EID_SSID;
2090 *pos++ = 0x0;
2091
2092 mesh_mgmt_ies_add(skb, sdata);
2093 } else {
2094 WARN_ON(1);
2095 goto out;
2096 }
2097
2098 info = IEEE80211_SKB_CB(skb);
2099
2100 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2101 info->band = band;
2102
2103
2104
2105 info->control.rates[0].idx = 0;
2106 info->control.rates[0].count = 1;
2107 info->control.rates[1].idx = -1;
2108 info->control.rates[2].idx = -1;
2109 info->control.rates[3].idx = -1;
2110 info->control.rates[4].idx = -1;
2111 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
2112
2113 info->control.vif = vif;
2114
2115 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2116 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
2117 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2118 out:
2119 rcu_read_unlock();
2120 return skb;
2121}
2122EXPORT_SYMBOL(ieee80211_beacon_get);
2123
2124void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2125 const void *frame, size_t frame_len,
2126 const struct ieee80211_tx_info *frame_txctl,
2127 struct ieee80211_rts *rts)
2128{
2129 const struct ieee80211_hdr *hdr = frame;
2130
2131 rts->frame_control =
2132 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2133 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2134 frame_txctl);
2135 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2136 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2137}
2138EXPORT_SYMBOL(ieee80211_rts_get);
2139
2140void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2141 const void *frame, size_t frame_len,
2142 const struct ieee80211_tx_info *frame_txctl,
2143 struct ieee80211_cts *cts)
2144{
2145 const struct ieee80211_hdr *hdr = frame;
2146
2147 cts->frame_control =
2148 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2149 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2150 frame_len, frame_txctl);
2151 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2152}
2153EXPORT_SYMBOL(ieee80211_ctstoself_get);
2154
2155struct sk_buff *
2156ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2157 struct ieee80211_vif *vif)
2158{
2159 struct ieee80211_local *local = hw_to_local(hw);
2160 struct sk_buff *skb = NULL;
2161 struct sta_info *sta;
2162 struct ieee80211_tx_data tx;
2163 struct ieee80211_sub_if_data *sdata;
2164 struct ieee80211_if_ap *bss = NULL;
2165 struct beacon_data *beacon;
2166 struct ieee80211_tx_info *info;
2167
2168 sdata = vif_to_sdata(vif);
2169 bss = &sdata->u.ap;
2170
2171 rcu_read_lock();
2172 beacon = rcu_dereference(bss->beacon);
2173
2174 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2175 goto out;
2176
2177 if (bss->dtim_count != 0)
2178 goto out;
2179
2180 while (1) {
2181 skb = skb_dequeue(&bss->ps_bc_buf);
2182 if (!skb)
2183 goto out;
2184 local->total_ps_buffered--;
2185
2186 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2187 struct ieee80211_hdr *hdr =
2188 (struct ieee80211_hdr *) skb->data;
2189
2190
2191
2192 hdr->frame_control |=
2193 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2194 }
2195
2196 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2197 break;
2198 dev_kfree_skb_any(skb);
2199 }
2200
2201 info = IEEE80211_SKB_CB(skb);
2202
2203 sta = tx.sta;
2204 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2205 tx.channel = local->hw.conf.channel;
2206 info->band = tx.channel->band;
2207
2208 if (invoke_tx_handlers(&tx))
2209 skb = NULL;
2210 out:
2211 rcu_read_unlock();
2212
2213 return skb;
2214}
2215EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2216
2217void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2218 int encrypt)
2219{
2220 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2221 skb_set_mac_header(skb, 0);
2222 skb_set_network_header(skb, 0);
2223 skb_set_transport_header(skb, 0);
2224
2225 if (!encrypt)
2226 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2227
2228
2229
2230
2231
2232
2233 local_bh_disable();
2234 ieee80211_xmit(sdata, skb);
2235 local_bh_enable();
2236}
2237