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[SCSI] mpt2sas: modified _scsih_sas_device_find_by_handle/sas_address
[linux-2.6/linux-mips.git] / net / mac80211 / tx.c
blobcfc473e1b0509ca1850d61a49b5dd59b23ecee55
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "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 /* misc utils */
41
42 static __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 /* assume HW handles this */
53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
54 return 0;
55
56 /* uh huh? */
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 * data and mgmt (except PS Poll):
67 * - during CFP: 32768
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 *
75 * IEEE 802.11, 9.6:
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
80 * BSSBasicRateSet
81 */
82 hdr = (struct ieee80211_hdr *)tx->skb->data;
83 if (ieee80211_is_ctl(hdr->frame_control)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
87 *
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
95 * and its SIFS
96 * PS Poll: BIT(15) | BIT(14) | aid
97 */
98 return 0;
99 }
100
101 /* data/mgmt */
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
104
105 if (group_addr) /* Group address as the destination - no ACK */
106 return 0;
107
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 */
118 rate = -1;
119 /* use lowest available if everything fails */
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 /* No matching basic rate found; use highest suitable mandatory
152 * PHY rate */
153 rate = mrate;
154 }
155
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
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 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur *= 2; /* ACK + SIFS */
167 /* next fragment */
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
176 static 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 /* tx handlers */
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
185 {
186 struct ieee80211_local *local = tx->local;
187 struct ieee80211_if_managed *ifmgd;
188
189 /* driver doesn't support power save */
190 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
191 return TX_CONTINUE;
192
193 /* hardware does dynamic power save */
194 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
195 return TX_CONTINUE;
196
197 /* dynamic power save disabled */
198 if (local->hw.conf.dynamic_ps_timeout <= 0)
199 return TX_CONTINUE;
200
201 /* we are scanning, don't enable power save */
202 if (local->scanning)
203 return TX_CONTINUE;
204
205 if (!local->ps_sdata)
206 return TX_CONTINUE;
207
208 /* No point if we're going to suspend */
209 if (local->quiescing)
210 return TX_CONTINUE;
211
212 /* dynamic ps is supported only in managed mode */
213 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
214 return TX_CONTINUE;
215
216 ifmgd = &tx->sdata->u.mgd;
217
218 /*
219 * Don't wakeup from power save if u-apsd is enabled, voip ac has
220 * u-apsd enabled and the frame is in voip class. This effectively
221 * means that even if all access categories have u-apsd enabled, in
222 * practise u-apsd is only used with the voip ac. This is a
223 * workaround for the case when received voip class packets do not
224 * have correct qos tag for some reason, due the network or the
225 * peer application.
226 *
227 * Note: local->uapsd_queues access is racy here. If the value is
228 * changed via debugfs, user needs to reassociate manually to have
229 * everything in sync.
230 */
231 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
232 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
233 && skb_get_queue_mapping(tx->skb) == 0)
234 return TX_CONTINUE;
235
236 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
237 ieee80211_stop_queues_by_reason(&local->hw,
238 IEEE80211_QUEUE_STOP_REASON_PS);
239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
241 }
242
243 mod_timer(&local->dynamic_ps_timer, jiffies +
244 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
245
246 return TX_CONTINUE;
247 }
248
249 static ieee80211_tx_result debug_noinline
250 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
251 {
252
253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
255 u32 sta_flags;
256
257 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
258 return TX_CONTINUE;
259
260 if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) &&
261 !ieee80211_is_probe_req(hdr->frame_control) &&
262 !ieee80211_is_nullfunc(hdr->frame_control))
263 /*
264 * When software scanning only nullfunc frames (to notify
265 * the sleep state to the AP) and probe requests (for the
266 * active scan) are allowed, all other frames should not be
267 * sent and we should not get here, but if we do
268 * nonetheless, drop them to avoid sending them
269 * off-channel. See the link below and
270 * ieee80211_start_scan() for more.
271 *
272 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
273 */
274 return TX_DROP;
275
276 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
277 return TX_CONTINUE;
278
279 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
280 return TX_CONTINUE;
281
282 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
283
284 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
285 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
286 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
287 ieee80211_is_data(hdr->frame_control))) {
288 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
289 printk(KERN_DEBUG "%s: dropped data frame to not "
290 "associated station %pM\n",
291 tx->sdata->name, hdr->addr1);
292 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
293 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
294 return TX_DROP;
295 }
296 } else {
297 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
298 tx->local->num_sta == 0 &&
299 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
300 /*
301 * No associated STAs - no need to send multicast
302 * frames.
303 */
304 return TX_DROP;
305 }
306 return TX_CONTINUE;
307 }
308
309 return TX_CONTINUE;
310 }
311
312 /* This function is called whenever the AP is about to exceed the maximum limit
313 * of buffered frames for power saving STAs. This situation should not really
314 * happen often during normal operation, so dropping the oldest buffered packet
315 * from each queue should be OK to make some room for new frames. */
316 static void purge_old_ps_buffers(struct ieee80211_local *local)
317 {
318 int total = 0, purged = 0;
319 struct sk_buff *skb;
320 struct ieee80211_sub_if_data *sdata;
321 struct sta_info *sta;
322
323 /*
324 * virtual interfaces are protected by RCU
325 */
326 rcu_read_lock();
327
328 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
329 struct ieee80211_if_ap *ap;
330 if (sdata->vif.type != NL80211_IFTYPE_AP)
331 continue;
332 ap = &sdata->u.ap;
333 skb = skb_dequeue(&ap->ps_bc_buf);
334 if (skb) {
335 purged++;
336 dev_kfree_skb(skb);
337 }
338 total += skb_queue_len(&ap->ps_bc_buf);
339 }
340
341 list_for_each_entry_rcu(sta, &local->sta_list, list) {
342 skb = skb_dequeue(&sta->ps_tx_buf);
343 if (skb) {
344 purged++;
345 dev_kfree_skb(skb);
346 }
347 total += skb_queue_len(&sta->ps_tx_buf);
348 }
349
350 rcu_read_unlock();
351
352 local->total_ps_buffered = total;
353 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
354 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
355 wiphy_name(local->hw.wiphy), purged);
356 #endif
357 }
358
359 static ieee80211_tx_result
360 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
361 {
362 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
363 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
364
365 /*
366 * broadcast/multicast frame
367 *
368 * If any of the associated stations is in power save mode,
369 * the frame is buffered to be sent after DTIM beacon frame.
370 * This is done either by the hardware or us.
371 */
372
373 /* powersaving STAs only in AP/VLAN mode */
374 if (!tx->sdata->bss)
375 return TX_CONTINUE;
376
377 /* no buffering for ordered frames */
378 if (ieee80211_has_order(hdr->frame_control))
379 return TX_CONTINUE;
380
381 /* no stations in PS mode */
382 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
383 return TX_CONTINUE;
384
385 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
386
387 /* device releases frame after DTIM beacon */
388 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
389 return TX_CONTINUE;
390
391 /* buffered in mac80211 */
392 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
393 purge_old_ps_buffers(tx->local);
394
395 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
396 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
397 if (net_ratelimit())
398 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
399 tx->sdata->name);
400 #endif
401 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
402 } else
403 tx->local->total_ps_buffered++;
404
405 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
406
407 return TX_QUEUED;
408 }
409
410 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
411 struct sk_buff *skb)
412 {
413 if (!ieee80211_is_mgmt(fc))
414 return 0;
415
416 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
417 return 0;
418
419 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
420 skb->data))
421 return 0;
422
423 return 1;
424 }
425
426 static ieee80211_tx_result
427 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
428 {
429 struct sta_info *sta = tx->sta;
430 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
432 u32 staflags;
433
434 if (unlikely(!sta ||
435 ieee80211_is_probe_resp(hdr->frame_control) ||
436 ieee80211_is_auth(hdr->frame_control) ||
437 ieee80211_is_assoc_resp(hdr->frame_control) ||
438 ieee80211_is_reassoc_resp(hdr->frame_control)))
439 return TX_CONTINUE;
440
441 staflags = get_sta_flags(sta);
442
443 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
444 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
445 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
446 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
447 "before %d)\n",
448 sta->sta.addr, sta->sta.aid,
449 skb_queue_len(&sta->ps_tx_buf));
450 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
451 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
452 purge_old_ps_buffers(tx->local);
453 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
454 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
455 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
456 if (net_ratelimit()) {
457 printk(KERN_DEBUG "%s: STA %pM TX "
458 "buffer full - dropping oldest frame\n",
459 tx->sdata->name, sta->sta.addr);
460 }
461 #endif
462 dev_kfree_skb(old);
463 } else
464 tx->local->total_ps_buffered++;
465
466 /*
467 * Queue frame to be sent after STA wakes up/polls,
468 * but don't set the TIM bit if the driver is blocking
469 * wakeup or poll response transmissions anyway.
470 */
471 if (skb_queue_empty(&sta->ps_tx_buf) &&
472 !(staflags & WLAN_STA_PS_DRIVER))
473 sta_info_set_tim_bit(sta);
474
475 info->control.jiffies = jiffies;
476 info->control.vif = &tx->sdata->vif;
477 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
478 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
479 return TX_QUEUED;
480 }
481 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
482 else if (unlikely(staflags & WLAN_STA_PS_STA)) {
483 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
484 "set -> send frame\n", tx->sdata->name,
485 sta->sta.addr);
486 }
487 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
488
489 return TX_CONTINUE;
490 }
491
492 static ieee80211_tx_result debug_noinline
493 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
494 {
495 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
496 return TX_CONTINUE;
497
498 if (tx->flags & IEEE80211_TX_UNICAST)
499 return ieee80211_tx_h_unicast_ps_buf(tx);
500 else
501 return ieee80211_tx_h_multicast_ps_buf(tx);
502 }
503
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
506 {
507 struct ieee80211_key *key = NULL;
508 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
509 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
510
511 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
512 tx->key = NULL;
513 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
514 tx->key = key;
515 else if (ieee80211_is_mgmt(hdr->frame_control) &&
516 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
517 tx->key = key;
518 else if ((key = rcu_dereference(tx->sdata->default_key)))
519 tx->key = key;
520 else if (tx->sdata->drop_unencrypted &&
521 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
522 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
523 (!ieee80211_is_robust_mgmt_frame(hdr) ||
524 (ieee80211_is_action(hdr->frame_control) &&
525 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
526 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
527 return TX_DROP;
528 } else
529 tx->key = NULL;
530
531 if (tx->key) {
532 bool skip_hw = false;
533
534 tx->key->tx_rx_count++;
535 /* TODO: add threshold stuff again */
536
537 switch (tx->key->conf.alg) {
538 case ALG_WEP:
539 if (ieee80211_is_auth(hdr->frame_control))
540 break;
541 case ALG_TKIP:
542 if (!ieee80211_is_data_present(hdr->frame_control))
543 tx->key = NULL;
544 break;
545 case ALG_CCMP:
546 if (!ieee80211_is_data_present(hdr->frame_control) &&
547 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
548 tx->skb))
549 tx->key = NULL;
550 else
551 skip_hw = (tx->key->conf.flags &
552 IEEE80211_KEY_FLAG_SW_MGMT) &&
553 ieee80211_is_mgmt(hdr->frame_control);
554 break;
555 case ALG_AES_CMAC:
556 if (!ieee80211_is_mgmt(hdr->frame_control))
557 tx->key = NULL;
558 break;
559 }
560
561 if (!skip_hw && tx->key &&
562 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
563 info->control.hw_key = &tx->key->conf;
564 }
565
566 return TX_CONTINUE;
567 }
568
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_sta(struct ieee80211_tx_data *tx)
571 {
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
573
574 if (tx->sta && tx->sta->uploaded)
575 info->control.sta = &tx->sta->sta;
576
577 return TX_CONTINUE;
578 }
579
580 static ieee80211_tx_result debug_noinline
581 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
582 {
583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
584 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
585 struct ieee80211_supported_band *sband;
586 struct ieee80211_rate *rate;
587 int i, len;
588 bool inval = false, rts = false, short_preamble = false;
589 struct ieee80211_tx_rate_control txrc;
590 u32 sta_flags;
591
592 memset(&txrc, 0, sizeof(txrc));
593
594 sband = tx->local->hw.wiphy->bands[tx->channel->band];
595
596 len = min_t(int, tx->skb->len + FCS_LEN,
597 tx->local->hw.wiphy->frag_threshold);
598
599 /* set up the tx rate control struct we give the RC algo */
600 txrc.hw = local_to_hw(tx->local);
601 txrc.sband = sband;
602 txrc.bss_conf = &tx->sdata->vif.bss_conf;
603 txrc.skb = tx->skb;
604 txrc.reported_rate.idx = -1;
605 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
606 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
607 txrc.max_rate_idx = -1;
608 else
609 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
610 txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
611
612 /* set up RTS protection if desired */
613 if (len > tx->local->hw.wiphy->rts_threshold) {
614 txrc.rts = rts = true;
615 }
616
617 /*
618 * Use short preamble if the BSS can handle it, but not for
619 * management frames unless we know the receiver can handle
620 * that -- the management frame might be to a station that
621 * just wants a probe response.
622 */
623 if (tx->sdata->vif.bss_conf.use_short_preamble &&
624 (ieee80211_is_data(hdr->frame_control) ||
625 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
626 txrc.short_preamble = short_preamble = true;
627
628 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
629
630 /*
631 * Lets not bother rate control if we're associated and cannot
632 * talk to the sta. This should not happen.
633 */
634 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
635 (sta_flags & WLAN_STA_ASSOC) &&
636 !rate_usable_index_exists(sband, &tx->sta->sta),
637 "%s: Dropped data frame as no usable bitrate found while "
638 "scanning and associated. Target station: "
639 "%pM on %d GHz band\n",
640 tx->sdata->name, hdr->addr1,
641 tx->channel->band ? 5 : 2))
642 return TX_DROP;
643
644 /*
645 * If we're associated with the sta at this point we know we can at
646 * least send the frame at the lowest bit rate.
647 */
648 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
649
650 if (unlikely(info->control.rates[0].idx < 0))
651 return TX_DROP;
652
653 if (txrc.reported_rate.idx < 0)
654 txrc.reported_rate = info->control.rates[0];
655
656 if (tx->sta)
657 tx->sta->last_tx_rate = txrc.reported_rate;
658
659 if (unlikely(!info->control.rates[0].count))
660 info->control.rates[0].count = 1;
661
662 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
663 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
664 info->control.rates[0].count = 1;
665
666 if (is_multicast_ether_addr(hdr->addr1)) {
667 /*
668 * XXX: verify the rate is in the basic rateset
669 */
670 return TX_CONTINUE;
671 }
672
673 /*
674 * set up the RTS/CTS rate as the fastest basic rate
675 * that is not faster than the data rate
676 *
677 * XXX: Should this check all retry rates?
678 */
679 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
680 s8 baserate = 0;
681
682 rate = &sband->bitrates[info->control.rates[0].idx];
683
684 for (i = 0; i < sband->n_bitrates; i++) {
685 /* must be a basic rate */
686 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
687 continue;
688 /* must not be faster than the data rate */
689 if (sband->bitrates[i].bitrate > rate->bitrate)
690 continue;
691 /* maximum */
692 if (sband->bitrates[baserate].bitrate <
693 sband->bitrates[i].bitrate)
694 baserate = i;
695 }
696
697 info->control.rts_cts_rate_idx = baserate;
698 }
699
700 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
701 /*
702 * make sure there's no valid rate following
703 * an invalid one, just in case drivers don't
704 * take the API seriously to stop at -1.
705 */
706 if (inval) {
707 info->control.rates[i].idx = -1;
708 continue;
709 }
710 if (info->control.rates[i].idx < 0) {
711 inval = true;
712 continue;
713 }
714
715 /*
716 * For now assume MCS is already set up correctly, this
717 * needs to be fixed.
718 */
719 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
720 WARN_ON(info->control.rates[i].idx > 76);
721 continue;
722 }
723
724 /* set up RTS protection if desired */
725 if (rts)
726 info->control.rates[i].flags |=
727 IEEE80211_TX_RC_USE_RTS_CTS;
728
729 /* RC is busted */
730 if (WARN_ON_ONCE(info->control.rates[i].idx >=
731 sband->n_bitrates)) {
732 info->control.rates[i].idx = -1;
733 continue;
734 }
735
736 rate = &sband->bitrates[info->control.rates[i].idx];
737
738 /* set up short preamble */
739 if (short_preamble &&
740 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
741 info->control.rates[i].flags |=
742 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
743
744 /* set up G protection */
745 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
746 rate->flags & IEEE80211_RATE_ERP_G)
747 info->control.rates[i].flags |=
748 IEEE80211_TX_RC_USE_CTS_PROTECT;
749 }
750
751 return TX_CONTINUE;
752 }
753
754 static ieee80211_tx_result debug_noinline
755 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
756 {
757 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
758 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
759 u16 *seq;
760 u8 *qc;
761 int tid;
762
763 /*
764 * Packet injection may want to control the sequence
765 * number, if we have no matching interface then we
766 * neither assign one ourselves nor ask the driver to.
767 */
768 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
769 return TX_CONTINUE;
770
771 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
772 return TX_CONTINUE;
773
774 if (ieee80211_hdrlen(hdr->frame_control) < 24)
775 return TX_CONTINUE;
776
777 /*
778 * Anything but QoS data that has a sequence number field
779 * (is long enough) gets a sequence number from the global
780 * counter.
781 */
782 if (!ieee80211_is_data_qos(hdr->frame_control)) {
783 /* driver should assign sequence number */
784 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
785 /* for pure STA mode without beacons, we can do it */
786 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
787 tx->sdata->sequence_number += 0x10;
788 return TX_CONTINUE;
789 }
790
791 /*
792 * This should be true for injected/management frames only, for
793 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
794 * above since they are not QoS-data frames.
795 */
796 if (!tx->sta)
797 return TX_CONTINUE;
798
799 /* include per-STA, per-TID sequence counter */
800
801 qc = ieee80211_get_qos_ctl(hdr);
802 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
803 seq = &tx->sta->tid_seq[tid];
804
805 hdr->seq_ctrl = cpu_to_le16(*seq);
806
807 /* Increase the sequence number. */
808 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
809
810 return TX_CONTINUE;
811 }
812
813 static int ieee80211_fragment(struct ieee80211_local *local,
814 struct sk_buff *skb, int hdrlen,
815 int frag_threshold)
816 {
817 struct sk_buff *tail = skb, *tmp;
818 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
819 int pos = hdrlen + per_fragm;
820 int rem = skb->len - hdrlen - per_fragm;
821
822 if (WARN_ON(rem < 0))
823 return -EINVAL;
824
825 while (rem) {
826 int fraglen = per_fragm;
827
828 if (fraglen > rem)
829 fraglen = rem;
830 rem -= fraglen;
831 tmp = dev_alloc_skb(local->tx_headroom +
832 frag_threshold +
833 IEEE80211_ENCRYPT_HEADROOM +
834 IEEE80211_ENCRYPT_TAILROOM);
835 if (!tmp)
836 return -ENOMEM;
837 tail->next = tmp;
838 tail = tmp;
839 skb_reserve(tmp, local->tx_headroom +
840 IEEE80211_ENCRYPT_HEADROOM);
841 /* copy control information */
842 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
843 skb_copy_queue_mapping(tmp, skb);
844 tmp->priority = skb->priority;
845 tmp->dev = skb->dev;
846
847 /* copy header and data */
848 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
849 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
850
851 pos += fraglen;
852 }
853
854 skb->len = hdrlen + per_fragm;
855 return 0;
856 }
857
858 static ieee80211_tx_result debug_noinline
859 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
860 {
861 struct sk_buff *skb = tx->skb;
862 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
863 struct ieee80211_hdr *hdr = (void *)skb->data;
864 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
865 int hdrlen;
866 int fragnum;
867
868 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
869 return TX_CONTINUE;
870
871 /*
872 * Warn when submitting a fragmented A-MPDU frame and drop it.
873 * This scenario is handled in ieee80211_tx_prepare but extra
874 * caution taken here as fragmented ampdu may cause Tx stop.
875 */
876 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
877 return TX_DROP;
878
879 hdrlen = ieee80211_hdrlen(hdr->frame_control);
880
881 /* internal error, why is TX_FRAGMENTED set? */
882 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
883 return TX_DROP;
884
885 /*
886 * Now fragment the frame. This will allocate all the fragments and
887 * chain them (using skb as the first fragment) to skb->next.
888 * During transmission, we will remove the successfully transmitted
889 * fragments from this list. When the low-level driver rejects one
890 * of the fragments then we will simply pretend to accept the skb
891 * but store it away as pending.
892 */
893 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
894 return TX_DROP;
895
896 /* update duration/seq/flags of fragments */
897 fragnum = 0;
898 do {
899 int next_len;
900 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
901
902 hdr = (void *)skb->data;
903 info = IEEE80211_SKB_CB(skb);
904
905 if (skb->next) {
906 hdr->frame_control |= morefrags;
907 next_len = skb->next->len;
908 /*
909 * No multi-rate retries for fragmented frames, that
910 * would completely throw off the NAV at other STAs.
911 */
912 info->control.rates[1].idx = -1;
913 info->control.rates[2].idx = -1;
914 info->control.rates[3].idx = -1;
915 info->control.rates[4].idx = -1;
916 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
917 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
918 } else {
919 hdr->frame_control &= ~morefrags;
920 next_len = 0;
921 }
922 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
923 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
924 fragnum++;
925 } while ((skb = skb->next));
926
927 return TX_CONTINUE;
928 }
929
930 static ieee80211_tx_result debug_noinline
931 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
932 {
933 struct sk_buff *skb = tx->skb;
934
935 if (!tx->sta)
936 return TX_CONTINUE;
937
938 tx->sta->tx_packets++;
939 do {
940 tx->sta->tx_fragments++;
941 tx->sta->tx_bytes += skb->len;
942 } while ((skb = skb->next));
943
944 return TX_CONTINUE;
945 }
946
947 static ieee80211_tx_result debug_noinline
948 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
949 {
950 if (!tx->key)
951 return TX_CONTINUE;
952
953 switch (tx->key->conf.alg) {
954 case ALG_WEP:
955 return ieee80211_crypto_wep_encrypt(tx);
956 case ALG_TKIP:
957 return ieee80211_crypto_tkip_encrypt(tx);
958 case ALG_CCMP:
959 return ieee80211_crypto_ccmp_encrypt(tx);
960 case ALG_AES_CMAC:
961 return ieee80211_crypto_aes_cmac_encrypt(tx);
962 }
963
964 /* not reached */
965 WARN_ON(1);
966 return TX_DROP;
967 }
968
969 static ieee80211_tx_result debug_noinline
970 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
971 {
972 struct sk_buff *skb = tx->skb;
973 struct ieee80211_hdr *hdr;
974 int next_len;
975 bool group_addr;
976
977 do {
978 hdr = (void *) skb->data;
979 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
980 break; /* must not overwrite AID */
981 next_len = skb->next ? skb->next->len : 0;
982 group_addr = is_multicast_ether_addr(hdr->addr1);
983
984 hdr->duration_id =
985 ieee80211_duration(tx, group_addr, next_len);
986 } while ((skb = skb->next));
987
988 return TX_CONTINUE;
989 }
990
991 /* actual transmit path */
992
993 /*
994 * deal with packet injection down monitor interface
995 * with Radiotap Header -- only called for monitor mode interface
996 */
997 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
998 struct sk_buff *skb)
999 {
1000 /*
1001 * this is the moment to interpret and discard the radiotap header that
1002 * must be at the start of the packet injected in Monitor mode
1003 *
1004 * Need to take some care with endian-ness since radiotap
1005 * args are little-endian
1006 */
1007
1008 struct ieee80211_radiotap_iterator iterator;
1009 struct ieee80211_radiotap_header *rthdr =
1010 (struct ieee80211_radiotap_header *) skb->data;
1011 struct ieee80211_supported_band *sband;
1012 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1013 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1014 NULL);
1015
1016 sband = tx->local->hw.wiphy->bands[tx->channel->band];
1017
1018 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1019 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1020
1021 /*
1022 * for every radiotap entry that is present
1023 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1024 * entries present, or -EINVAL on error)
1025 */
1026
1027 while (!ret) {
1028 ret = ieee80211_radiotap_iterator_next(&iterator);
1029
1030 if (ret)
1031 continue;
1032
1033 /* see if this argument is something we can use */
1034 switch (iterator.this_arg_index) {
1035 /*
1036 * You must take care when dereferencing iterator.this_arg
1037 * for multibyte types... the pointer is not aligned. Use
1038 * get_unaligned((type *)iterator.this_arg) to dereference
1039 * iterator.this_arg for type "type" safely on all arches.
1040 */
1041 case IEEE80211_RADIOTAP_FLAGS:
1042 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1043 /*
1044 * this indicates that the skb we have been
1045 * handed has the 32-bit FCS CRC at the end...
1046 * we should react to that by snipping it off
1047 * because it will be recomputed and added
1048 * on transmission
1049 */
1050 if (skb->len < (iterator._max_length + FCS_LEN))
1051 return false;
1052
1053 skb_trim(skb, skb->len - FCS_LEN);
1054 }
1055 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1056 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1057 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1058 tx->flags |= IEEE80211_TX_FRAGMENTED;
1059 break;
1060
1061 /*
1062 * Please update the file
1063 * Documentation/networking/mac80211-injection.txt
1064 * when parsing new fields here.
1065 */
1066
1067 default:
1068 break;
1069 }
1070 }
1071
1072 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1073 return false;
1074
1075 /*
1076 * remove the radiotap header
1077 * iterator->_max_length was sanity-checked against
1078 * skb->len by iterator init
1079 */
1080 skb_pull(skb, iterator._max_length);
1081
1082 return true;
1083 }
1084
1085 /*
1086 * initialises @tx
1087 */
1088 static ieee80211_tx_result
1089 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1090 struct ieee80211_tx_data *tx,
1091 struct sk_buff *skb)
1092 {
1093 struct ieee80211_local *local = sdata->local;
1094 struct ieee80211_hdr *hdr;
1095 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1096 int hdrlen, tid;
1097 u8 *qc, *state;
1098 bool queued = false;
1099
1100 memset(tx, 0, sizeof(*tx));
1101 tx->skb = skb;
1102 tx->local = local;
1103 tx->sdata = sdata;
1104 tx->channel = local->hw.conf.channel;
1105 /*
1106 * Set this flag (used below to indicate "automatic fragmentation"),
1107 * it will be cleared/left by radiotap as desired.
1108 */
1109 tx->flags |= IEEE80211_TX_FRAGMENTED;
1110
1111 /* process and remove the injection radiotap header */
1112 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1113 if (!__ieee80211_parse_tx_radiotap(tx, skb))
1114 return TX_DROP;
1115
1116 /*
1117 * __ieee80211_parse_tx_radiotap has now removed
1118 * the radiotap header that was present and pre-filled
1119 * 'tx' with tx control information.
1120 */
1121 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1122 }
1123
1124 /*
1125 * If this flag is set to true anywhere, and we get here,
1126 * we are doing the needed processing, so remove the flag
1127 * now.
1128 */
1129 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1130
1131 hdr = (struct ieee80211_hdr *) skb->data;
1132
1133 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1134 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1135 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1136 return TX_DROP;
1137 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1138 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1139 }
1140 if (!tx->sta)
1141 tx->sta = sta_info_get(sdata, hdr->addr1);
1142
1143 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1144 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1145 unsigned long flags;
1146 struct tid_ampdu_tx *tid_tx;
1147
1148 qc = ieee80211_get_qos_ctl(hdr);
1149 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1150
1151 spin_lock_irqsave(&tx->sta->lock, flags);
1152 /*
1153 * XXX: This spinlock could be fairly expensive, but see the
1154 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1155 * One way to solve this would be to do something RCU-like
1156 * for managing the tid_tx struct and using atomic bitops
1157 * for the actual state -- by introducing an actual
1158 * 'operational' bit that would be possible. It would
1159 * require changing ieee80211_agg_tx_operational() to
1160 * set that bit, and changing the way tid_tx is managed
1161 * everywhere, including races between that bit and
1162 * tid_tx going away (tid_tx being added can be easily
1163 * committed to memory before the 'operational' bit).
1164 */
1165 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1166 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1167 if (*state == HT_AGG_STATE_OPERATIONAL) {
1168 info->flags |= IEEE80211_TX_CTL_AMPDU;
1169 } else if (*state != HT_AGG_STATE_IDLE) {
1170 /* in progress */
1171 queued = true;
1172 info->control.vif = &sdata->vif;
1173 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1174 __skb_queue_tail(&tid_tx->pending, skb);
1175 }
1176 spin_unlock_irqrestore(&tx->sta->lock, flags);
1177
1178 if (unlikely(queued))
1179 return TX_QUEUED;
1180 }
1181
1182 if (is_multicast_ether_addr(hdr->addr1)) {
1183 tx->flags &= ~IEEE80211_TX_UNICAST;
1184 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1185 } else {
1186 tx->flags |= IEEE80211_TX_UNICAST;
1187 if (unlikely(local->wifi_wme_noack_test))
1188 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1189 else
1190 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1191 }
1192
1193 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1194 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1195 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1196 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1197 tx->flags |= IEEE80211_TX_FRAGMENTED;
1198 else
1199 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1200 }
1201
1202 if (!tx->sta)
1203 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1204 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1205 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1206
1207 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1208 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1209 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1210 tx->ethertype = (pos[0] << 8) | pos[1];
1211 }
1212 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1213
1214 return TX_CONTINUE;
1215 }
1216
1217 static int __ieee80211_tx(struct ieee80211_local *local,
1218 struct sk_buff **skbp,
1219 struct sta_info *sta,
1220 bool txpending)
1221 {
1222 struct sk_buff *skb = *skbp, *next;
1223 struct ieee80211_tx_info *info;
1224 struct ieee80211_sub_if_data *sdata;
1225 unsigned long flags;
1226 int ret, len;
1227 bool fragm = false;
1228
1229 while (skb) {
1230 int q = skb_get_queue_mapping(skb);
1231
1232 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1233 ret = IEEE80211_TX_OK;
1234 if (local->queue_stop_reasons[q] ||
1235 (!txpending && !skb_queue_empty(&local->pending[q])))
1236 ret = IEEE80211_TX_PENDING;
1237 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1238 if (ret != IEEE80211_TX_OK)
1239 return ret;
1240
1241 info = IEEE80211_SKB_CB(skb);
1242
1243 if (fragm)
1244 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1245 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1246
1247 next = skb->next;
1248 len = skb->len;
1249
1250 if (next)
1251 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1252
1253 sdata = vif_to_sdata(info->control.vif);
1254
1255 switch (sdata->vif.type) {
1256 case NL80211_IFTYPE_MONITOR:
1257 info->control.vif = NULL;
1258 break;
1259 case NL80211_IFTYPE_AP_VLAN:
1260 info->control.vif = &container_of(sdata->bss,
1261 struct ieee80211_sub_if_data, u.ap)->vif;
1262 break;
1263 default:
1264 /* keep */
1265 break;
1266 }
1267
1268 ret = drv_tx(local, skb);
1269 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1270 dev_kfree_skb(skb);
1271 ret = NETDEV_TX_OK;
1272 }
1273 if (ret != NETDEV_TX_OK) {
1274 info->control.vif = &sdata->vif;
1275 return IEEE80211_TX_AGAIN;
1276 }
1277
1278 *skbp = skb = next;
1279 ieee80211_led_tx(local, 1);
1280 fragm = true;
1281 }
1282
1283 return IEEE80211_TX_OK;
1284 }
1285
1286 /*
1287 * Invoke TX handlers, return 0 on success and non-zero if the
1288 * frame was dropped or queued.
1289 */
1290 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1291 {
1292 struct sk_buff *skb = tx->skb;
1293 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1294 ieee80211_tx_result res = TX_DROP;
1295
1296 #define CALL_TXH(txh) \
1297 do { \
1298 res = txh(tx); \
1299 if (res != TX_CONTINUE) \
1300 goto txh_done; \
1301 } while (0)
1302
1303 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1304 CALL_TXH(ieee80211_tx_h_check_assoc);
1305 CALL_TXH(ieee80211_tx_h_ps_buf);
1306 CALL_TXH(ieee80211_tx_h_select_key);
1307 CALL_TXH(ieee80211_tx_h_sta);
1308 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1309 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1310
1311 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1312 goto txh_done;
1313
1314 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1315 CALL_TXH(ieee80211_tx_h_sequence);
1316 CALL_TXH(ieee80211_tx_h_fragment);
1317 /* handlers after fragment must be aware of tx info fragmentation! */
1318 CALL_TXH(ieee80211_tx_h_stats);
1319 CALL_TXH(ieee80211_tx_h_encrypt);
1320 CALL_TXH(ieee80211_tx_h_calculate_duration);
1321 #undef CALL_TXH
1322
1323 txh_done:
1324 if (unlikely(res == TX_DROP)) {
1325 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1326 while (skb) {
1327 struct sk_buff *next;
1328
1329 next = skb->next;
1330 dev_kfree_skb(skb);
1331 skb = next;
1332 }
1333 return -1;
1334 } else if (unlikely(res == TX_QUEUED)) {
1335 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1336 return -1;
1337 }
1338
1339 return 0;
1340 }
1341
1342 static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1343 struct sk_buff *skb, bool txpending)
1344 {
1345 struct ieee80211_local *local = sdata->local;
1346 struct ieee80211_tx_data tx;
1347 ieee80211_tx_result res_prepare;
1348 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1349 struct sk_buff *next;
1350 unsigned long flags;
1351 int ret, retries;
1352 u16 queue;
1353
1354 queue = skb_get_queue_mapping(skb);
1355
1356 if (unlikely(skb->len < 10)) {
1357 dev_kfree_skb(skb);
1358 return;
1359 }
1360
1361 rcu_read_lock();
1362
1363 /* initialises tx */
1364 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1365
1366 if (unlikely(res_prepare == TX_DROP)) {
1367 dev_kfree_skb(skb);
1368 rcu_read_unlock();
1369 return;
1370 } else if (unlikely(res_prepare == TX_QUEUED)) {
1371 rcu_read_unlock();
1372 return;
1373 }
1374
1375 tx.channel = local->hw.conf.channel;
1376 info->band = tx.channel->band;
1377
1378 if (invoke_tx_handlers(&tx))
1379 goto out;
1380
1381 retries = 0;
1382 retry:
1383 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1384 switch (ret) {
1385 case IEEE80211_TX_OK:
1386 break;
1387 case IEEE80211_TX_AGAIN:
1388 /*
1389 * Since there are no fragmented frames on A-MPDU
1390 * queues, there's no reason for a driver to reject
1391 * a frame there, warn and drop it.
1392 */
1393 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1394 goto drop;
1395 /* fall through */
1396 case IEEE80211_TX_PENDING:
1397 skb = tx.skb;
1398
1399 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1400
1401 if (local->queue_stop_reasons[queue] ||
1402 !skb_queue_empty(&local->pending[queue])) {
1403 /*
1404 * if queue is stopped, queue up frames for later
1405 * transmission from the tasklet
1406 */
1407 do {
1408 next = skb->next;
1409 skb->next = NULL;
1410 if (unlikely(txpending))
1411 __skb_queue_head(&local->pending[queue],
1412 skb);
1413 else
1414 __skb_queue_tail(&local->pending[queue],
1415 skb);
1416 } while ((skb = next));
1417
1418 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1419 flags);
1420 } else {
1421 /*
1422 * otherwise retry, but this is a race condition or
1423 * a driver bug (which we warn about if it persists)
1424 */
1425 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1426 flags);
1427
1428 retries++;
1429 if (WARN(retries > 10, "tx refused but queue active\n"))
1430 goto drop;
1431 goto retry;
1432 }
1433 }
1434 out:
1435 rcu_read_unlock();
1436 return;
1437
1438 drop:
1439 rcu_read_unlock();
1440
1441 skb = tx.skb;
1442 while (skb) {
1443 next = skb->next;
1444 dev_kfree_skb(skb);
1445 skb = next;
1446 }
1447 }
1448
1449 /* device xmit handlers */
1450
1451 static int ieee80211_skb_resize(struct ieee80211_local *local,
1452 struct sk_buff *skb,
1453 int head_need, bool may_encrypt)
1454 {
1455 int tail_need = 0;
1456
1457 /*
1458 * This could be optimised, devices that do full hardware
1459 * crypto (including TKIP MMIC) need no tailroom... But we
1460 * have no drivers for such devices currently.
1461 */
1462 if (may_encrypt) {
1463 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1464 tail_need -= skb_tailroom(skb);
1465 tail_need = max_t(int, tail_need, 0);
1466 }
1467
1468 if (head_need || tail_need) {
1469 /* Sorry. Can't account for this any more */
1470 skb_orphan(skb);
1471 }
1472
1473 if (skb_header_cloned(skb))
1474 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1475 else
1476 I802_DEBUG_INC(local->tx_expand_skb_head);
1477
1478 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1479 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1480 wiphy_name(local->hw.wiphy));
1481 return -ENOMEM;
1482 }
1483
1484 /* update truesize too */
1485 skb->truesize += head_need + tail_need;
1486
1487 return 0;
1488 }
1489
1490 static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1491 struct sk_buff *skb)
1492 {
1493 struct ieee80211_local *local = sdata->local;
1494 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1495 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1496 struct ieee80211_sub_if_data *tmp_sdata;
1497 int headroom;
1498 bool may_encrypt;
1499
1500 rcu_read_lock();
1501
1502 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1503 int hdrlen;
1504 u16 len_rthdr;
1505
1506 info->flags |= IEEE80211_TX_CTL_INJECTED |
1507 IEEE80211_TX_INTFL_HAS_RADIOTAP;
1508
1509 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1510 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1511 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1512
1513 /* check the header is complete in the frame */
1514 if (likely(skb->len >= len_rthdr + hdrlen)) {
1515 /*
1516 * We process outgoing injected frames that have a
1517 * local address we handle as though they are our
1518 * own frames.
1519 * This code here isn't entirely correct, the local
1520 * MAC address is not necessarily enough to find
1521 * the interface to use; for that proper VLAN/WDS
1522 * support we will need a different mechanism.
1523 */
1524
1525 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1526 list) {
1527 if (!ieee80211_sdata_running(tmp_sdata))
1528 continue;
1529 if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
1530 continue;
1531 if (compare_ether_addr(tmp_sdata->vif.addr,
1532 hdr->addr2) == 0) {
1533 sdata = tmp_sdata;
1534 break;
1535 }
1536 }
1537 }
1538 }
1539
1540 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1541
1542 headroom = local->tx_headroom;
1543 if (may_encrypt)
1544 headroom += IEEE80211_ENCRYPT_HEADROOM;
1545 headroom -= skb_headroom(skb);
1546 headroom = max_t(int, 0, headroom);
1547
1548 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1549 dev_kfree_skb(skb);
1550 rcu_read_unlock();
1551 return;
1552 }
1553
1554 info->control.vif = &sdata->vif;
1555
1556 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1557 ieee80211_is_data(hdr->frame_control) &&
1558 !is_multicast_ether_addr(hdr->addr1))
1559 if (mesh_nexthop_lookup(skb, sdata)) {
1560 /* skb queued: don't free */
1561 rcu_read_unlock();
1562 return;
1563 }
1564
1565 ieee80211_set_qos_hdr(local, skb);
1566 ieee80211_tx(sdata, skb, false);
1567 rcu_read_unlock();
1568 }
1569
1570 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1571 struct net_device *dev)
1572 {
1573 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1574 struct ieee80211_channel *chan = local->hw.conf.channel;
1575 struct ieee80211_radiotap_header *prthdr =
1576 (struct ieee80211_radiotap_header *)skb->data;
1577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1578 u16 len_rthdr;
1579
1580 /*
1581 * Frame injection is not allowed if beaconing is not allowed
1582 * or if we need radar detection. Beaconing is usually not allowed when
1583 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1584 * Passive scan is also used in world regulatory domains where
1585 * your country is not known and as such it should be treated as
1586 * NO TX unless the channel is explicitly allowed in which case
1587 * your current regulatory domain would not have the passive scan
1588 * flag.
1589 *
1590 * Since AP mode uses monitor interfaces to inject/TX management
1591 * frames we can make AP mode the exception to this rule once it
1592 * supports radar detection as its implementation can deal with
1593 * radar detection by itself. We can do that later by adding a
1594 * monitor flag interfaces used for AP support.
1595 */
1596 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1597 IEEE80211_CHAN_PASSIVE_SCAN)))
1598 goto fail;
1599
1600 /* check for not even having the fixed radiotap header part */
1601 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1602 goto fail; /* too short to be possibly valid */
1603
1604 /* is it a header version we can trust to find length from? */
1605 if (unlikely(prthdr->it_version))
1606 goto fail; /* only version 0 is supported */
1607
1608 /* then there must be a radiotap header with a length we can use */
1609 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1610
1611 /* does the skb contain enough to deliver on the alleged length? */
1612 if (unlikely(skb->len < len_rthdr))
1613 goto fail; /* skb too short for claimed rt header extent */
1614
1615 /*
1616 * fix up the pointers accounting for the radiotap
1617 * header still being in there. We are being given
1618 * a precooked IEEE80211 header so no need for
1619 * normal processing
1620 */
1621 skb_set_mac_header(skb, len_rthdr);
1622 /*
1623 * these are just fixed to the end of the rt area since we
1624 * don't have any better information and at this point, nobody cares
1625 */
1626 skb_set_network_header(skb, len_rthdr);
1627 skb_set_transport_header(skb, len_rthdr);
1628
1629 memset(info, 0, sizeof(*info));
1630
1631 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1632
1633 /* pass the radiotap header up to xmit */
1634 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1635 return NETDEV_TX_OK;
1636
1637 fail:
1638 dev_kfree_skb(skb);
1639 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1640 }
1641
1642 /**
1643 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1644 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1645 * @skb: packet to be sent
1646 * @dev: incoming interface
1647 *
1648 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1649 * not be freed, and caller is responsible for either retrying later or freeing
1650 * skb).
1651 *
1652 * This function takes in an Ethernet header and encapsulates it with suitable
1653 * IEEE 802.11 header based on which interface the packet is coming in. The
1654 * encapsulated packet will then be passed to master interface, wlan#.11, for
1655 * transmission (through low-level driver).
1656 */
1657 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1658 struct net_device *dev)
1659 {
1660 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1661 struct ieee80211_local *local = sdata->local;
1662 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1663 int ret = NETDEV_TX_BUSY, head_need;
1664 u16 ethertype, hdrlen, meshhdrlen = 0;
1665 __le16 fc;
1666 struct ieee80211_hdr hdr;
1667 struct ieee80211s_hdr mesh_hdr;
1668 const u8 *encaps_data;
1669 int encaps_len, skip_header_bytes;
1670 int nh_pos, h_pos;
1671 struct sta_info *sta = NULL;
1672 u32 sta_flags = 0;
1673
1674 if (unlikely(skb->len < ETH_HLEN)) {
1675 ret = NETDEV_TX_OK;
1676 goto fail;
1677 }
1678
1679 nh_pos = skb_network_header(skb) - skb->data;
1680 h_pos = skb_transport_header(skb) - skb->data;
1681
1682 /* convert Ethernet header to proper 802.11 header (based on
1683 * operation mode) */
1684 ethertype = (skb->data[12] << 8) | skb->data[13];
1685 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1686
1687 switch (sdata->vif.type) {
1688 case NL80211_IFTYPE_AP_VLAN:
1689 rcu_read_lock();
1690 sta = rcu_dereference(sdata->u.vlan.sta);
1691 if (sta) {
1692 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1693 /* RA TA DA SA */
1694 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1695 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1696 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1697 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1698 hdrlen = 30;
1699 sta_flags = get_sta_flags(sta);
1700 }
1701 rcu_read_unlock();
1702 if (sta)
1703 break;
1704 /* fall through */
1705 case NL80211_IFTYPE_AP:
1706 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1707 /* DA BSSID SA */
1708 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1709 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1710 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1711 hdrlen = 24;
1712 break;
1713 case NL80211_IFTYPE_WDS:
1714 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1715 /* RA TA DA SA */
1716 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1717 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1718 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1719 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1720 hdrlen = 30;
1721 break;
1722 #ifdef CONFIG_MAC80211_MESH
1723 case NL80211_IFTYPE_MESH_POINT:
1724 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1725 /* Do not send frames with mesh_ttl == 0 */
1726 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1727 ret = NETDEV_TX_OK;
1728 goto fail;
1729 }
1730
1731 if (compare_ether_addr(sdata->vif.addr,
1732 skb->data + ETH_ALEN) == 0) {
1733 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1734 skb->data, skb->data + ETH_ALEN);
1735 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1736 sdata, NULL, NULL, NULL);
1737 } else {
1738 /* packet from other interface */
1739 struct mesh_path *mppath;
1740 int is_mesh_mcast = 1;
1741 const u8 *mesh_da;
1742
1743 rcu_read_lock();
1744 if (is_multicast_ether_addr(skb->data))
1745 /* DA TA mSA AE:SA */
1746 mesh_da = skb->data;
1747 else {
1748 static const u8 bcast[ETH_ALEN] =
1749 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1750
1751 mppath = mpp_path_lookup(skb->data, sdata);
1752 if (mppath) {
1753 /* RA TA mDA mSA AE:DA SA */
1754 mesh_da = mppath->mpp;
1755 is_mesh_mcast = 0;
1756 } else {
1757 /* DA TA mSA AE:SA */
1758 mesh_da = bcast;
1759 }
1760 }
1761 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1762 mesh_da, sdata->vif.addr);
1763 rcu_read_unlock();
1764 if (is_mesh_mcast)
1765 meshhdrlen =
1766 ieee80211_new_mesh_header(&mesh_hdr,
1767 sdata,
1768 skb->data + ETH_ALEN,
1769 NULL,
1770 NULL);
1771 else
1772 meshhdrlen =
1773 ieee80211_new_mesh_header(&mesh_hdr,
1774 sdata,
1775 NULL,
1776 skb->data,
1777 skb->data + ETH_ALEN);
1778
1779 }
1780 break;
1781 #endif
1782 case NL80211_IFTYPE_STATION:
1783 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1784 if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) {
1785 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1786 /* RA TA DA SA */
1787 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1788 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1789 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1790 hdrlen = 30;
1791 } else {
1792 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1793 /* BSSID SA DA */
1794 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1795 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1796 hdrlen = 24;
1797 }
1798 break;
1799 case NL80211_IFTYPE_ADHOC:
1800 /* DA SA BSSID */
1801 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1802 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1803 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1804 hdrlen = 24;
1805 break;
1806 default:
1807 ret = NETDEV_TX_OK;
1808 goto fail;
1809 }
1810
1811 /*
1812 * There's no need to try to look up the destination
1813 * if it is a multicast address (which can only happen
1814 * in AP mode)
1815 */
1816 if (!is_multicast_ether_addr(hdr.addr1)) {
1817 rcu_read_lock();
1818 sta = sta_info_get(sdata, hdr.addr1);
1819 if (sta)
1820 sta_flags = get_sta_flags(sta);
1821 rcu_read_unlock();
1822 }
1823
1824 /* receiver and we are QoS enabled, use a QoS type frame */
1825 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1826 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1827 hdrlen += 2;
1828 }
1829
1830 /*
1831 * Drop unicast frames to unauthorised stations unless they are
1832 * EAPOL frames from the local station.
1833 */
1834 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1835 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1836 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1837 !(ethertype == ETH_P_PAE &&
1838 compare_ether_addr(sdata->vif.addr,
1839 skb->data + ETH_ALEN) == 0))) {
1840 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1841 if (net_ratelimit())
1842 printk(KERN_DEBUG "%s: dropped frame to %pM"
1843 " (unauthorized port)\n", dev->name,
1844 hdr.addr1);
1845 #endif
1846
1847 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1848
1849 ret = NETDEV_TX_OK;
1850 goto fail;
1851 }
1852
1853 hdr.frame_control = fc;
1854 hdr.duration_id = 0;
1855 hdr.seq_ctrl = 0;
1856
1857 skip_header_bytes = ETH_HLEN;
1858 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1859 encaps_data = bridge_tunnel_header;
1860 encaps_len = sizeof(bridge_tunnel_header);
1861 skip_header_bytes -= 2;
1862 } else if (ethertype >= 0x600) {
1863 encaps_data = rfc1042_header;
1864 encaps_len = sizeof(rfc1042_header);
1865 skip_header_bytes -= 2;
1866 } else {
1867 encaps_data = NULL;
1868 encaps_len = 0;
1869 }
1870
1871 skb_pull(skb, skip_header_bytes);
1872 nh_pos -= skip_header_bytes;
1873 h_pos -= skip_header_bytes;
1874
1875 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1876
1877 /*
1878 * So we need to modify the skb header and hence need a copy of
1879 * that. The head_need variable above doesn't, so far, include
1880 * the needed header space that we don't need right away. If we
1881 * can, then we don't reallocate right now but only after the
1882 * frame arrives at the master device (if it does...)
1883 *
1884 * If we cannot, however, then we will reallocate to include all
1885 * the ever needed space. Also, if we need to reallocate it anyway,
1886 * make it big enough for everything we may ever need.
1887 */
1888
1889 if (head_need > 0 || skb_cloned(skb)) {
1890 head_need += IEEE80211_ENCRYPT_HEADROOM;
1891 head_need += local->tx_headroom;
1892 head_need = max_t(int, 0, head_need);
1893 if (ieee80211_skb_resize(local, skb, head_need, true))
1894 goto fail;
1895 }
1896
1897 if (encaps_data) {
1898 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1899 nh_pos += encaps_len;
1900 h_pos += encaps_len;
1901 }
1902
1903 if (meshhdrlen > 0) {
1904 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1905 nh_pos += meshhdrlen;
1906 h_pos += meshhdrlen;
1907 }
1908
1909 if (ieee80211_is_data_qos(fc)) {
1910 __le16 *qos_control;
1911
1912 qos_control = (__le16*) skb_push(skb, 2);
1913 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1914 /*
1915 * Maybe we could actually set some fields here, for now just
1916 * initialise to zero to indicate no special operation.
1917 */
1918 *qos_control = 0;
1919 } else
1920 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1921
1922 nh_pos += hdrlen;
1923 h_pos += hdrlen;
1924
1925 dev->stats.tx_packets++;
1926 dev->stats.tx_bytes += skb->len;
1927
1928 /* Update skb pointers to various headers since this modified frame
1929 * is going to go through Linux networking code that may potentially
1930 * need things like pointer to IP header. */
1931 skb_set_mac_header(skb, 0);
1932 skb_set_network_header(skb, nh_pos);
1933 skb_set_transport_header(skb, h_pos);
1934
1935 memset(info, 0, sizeof(*info));
1936
1937 dev->trans_start = jiffies;
1938 ieee80211_xmit(sdata, skb);
1939
1940 return NETDEV_TX_OK;
1941
1942 fail:
1943 if (ret == NETDEV_TX_OK)
1944 dev_kfree_skb(skb);
1945
1946 return ret;
1947 }
1948
1949
1950 /*
1951 * ieee80211_clear_tx_pending may not be called in a context where
1952 * it is possible that it packets could come in again.
1953 */
1954 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1955 {
1956 int i;
1957
1958 for (i = 0; i < local->hw.queues; i++)
1959 skb_queue_purge(&local->pending[i]);
1960 }
1961
1962 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
1963 struct sk_buff *skb)
1964 {
1965 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1966 struct ieee80211_sub_if_data *sdata;
1967 struct sta_info *sta;
1968 struct ieee80211_hdr *hdr;
1969 int ret;
1970 bool result = true;
1971
1972 sdata = vif_to_sdata(info->control.vif);
1973
1974 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
1975 ieee80211_tx(sdata, skb, true);
1976 } else {
1977 hdr = (struct ieee80211_hdr *)skb->data;
1978 sta = sta_info_get(sdata, hdr->addr1);
1979
1980 ret = __ieee80211_tx(local, &skb, sta, true);
1981 if (ret != IEEE80211_TX_OK)
1982 result = false;
1983 }
1984
1985 return result;
1986 }
1987
1988 /*
1989 * Transmit all pending packets. Called from tasklet.
1990 */
1991 void ieee80211_tx_pending(unsigned long data)
1992 {
1993 struct ieee80211_local *local = (struct ieee80211_local *)data;
1994 struct ieee80211_sub_if_data *sdata;
1995 unsigned long flags;
1996 int i;
1997 bool txok;
1998
1999 rcu_read_lock();
2000
2001 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2002 for (i = 0; i < local->hw.queues; i++) {
2003 /*
2004 * If queue is stopped by something other than due to pending
2005 * frames, or we have no pending frames, proceed to next queue.
2006 */
2007 if (local->queue_stop_reasons[i] ||
2008 skb_queue_empty(&local->pending[i]))
2009 continue;
2010
2011 while (!skb_queue_empty(&local->pending[i])) {
2012 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2013 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2014 struct ieee80211_sub_if_data *sdata;
2015
2016 if (WARN_ON(!info->control.vif)) {
2017 kfree_skb(skb);
2018 continue;
2019 }
2020
2021 sdata = vif_to_sdata(info->control.vif);
2022 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2023 flags);
2024
2025 txok = ieee80211_tx_pending_skb(local, skb);
2026 if (!txok)
2027 __skb_queue_head(&local->pending[i], skb);
2028 spin_lock_irqsave(&local->queue_stop_reason_lock,
2029 flags);
2030 if (!txok)
2031 break;
2032 }
2033
2034 if (skb_queue_empty(&local->pending[i]))
2035 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2036 netif_tx_wake_queue(
2037 netdev_get_tx_queue(sdata->dev, i));
2038 }
2039 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2040
2041 rcu_read_unlock();
2042 }
2043
2044 /* functions for drivers to get certain frames */
2045
2046 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2047 struct sk_buff *skb,
2048 struct beacon_data *beacon)
2049 {
2050 u8 *pos, *tim;
2051 int aid0 = 0;
2052 int i, have_bits = 0, n1, n2;
2053
2054 /* Generate bitmap for TIM only if there are any STAs in power save
2055 * mode. */
2056 if (atomic_read(&bss->num_sta_ps) > 0)
2057 /* in the hope that this is faster than
2058 * checking byte-for-byte */
2059 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2060 IEEE80211_MAX_AID+1);
2061
2062 if (bss->dtim_count == 0)
2063 bss->dtim_count = beacon->dtim_period - 1;
2064 else
2065 bss->dtim_count--;
2066
2067 tim = pos = (u8 *) skb_put(skb, 6);
2068 *pos++ = WLAN_EID_TIM;
2069 *pos++ = 4;
2070 *pos++ = bss->dtim_count;
2071 *pos++ = beacon->dtim_period;
2072
2073 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2074 aid0 = 1;
2075
2076 if (have_bits) {
2077 /* Find largest even number N1 so that bits numbered 1 through
2078 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2079 * (N2 + 1) x 8 through 2007 are 0. */
2080 n1 = 0;
2081 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2082 if (bss->tim[i]) {
2083 n1 = i & 0xfe;
2084 break;
2085 }
2086 }
2087 n2 = n1;
2088 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2089 if (bss->tim[i]) {
2090 n2 = i;
2091 break;
2092 }
2093 }
2094
2095 /* Bitmap control */
2096 *pos++ = n1 | aid0;
2097 /* Part Virt Bitmap */
2098 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2099
2100 tim[1] = n2 - n1 + 4;
2101 skb_put(skb, n2 - n1);
2102 } else {
2103 *pos++ = aid0; /* Bitmap control */
2104 *pos++ = 0; /* Part Virt Bitmap */
2105 }
2106 }
2107
2108 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2109 struct ieee80211_vif *vif,
2110 u16 *tim_offset, u16 *tim_length)
2111 {
2112 struct ieee80211_local *local = hw_to_local(hw);
2113 struct sk_buff *skb = NULL;
2114 struct ieee80211_tx_info *info;
2115 struct ieee80211_sub_if_data *sdata = NULL;
2116 struct ieee80211_if_ap *ap = NULL;
2117 struct beacon_data *beacon;
2118 struct ieee80211_supported_band *sband;
2119 enum ieee80211_band band = local->hw.conf.channel->band;
2120 struct ieee80211_tx_rate_control txrc;
2121
2122 sband = local->hw.wiphy->bands[band];
2123
2124 rcu_read_lock();
2125
2126 sdata = vif_to_sdata(vif);
2127
2128 if (tim_offset)
2129 *tim_offset = 0;
2130 if (tim_length)
2131 *tim_length = 0;
2132
2133 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2134 ap = &sdata->u.ap;
2135 beacon = rcu_dereference(ap->beacon);
2136 if (ap && beacon) {
2137 /*
2138 * headroom, head length,
2139 * tail length and maximum TIM length
2140 */
2141 skb = dev_alloc_skb(local->tx_headroom +
2142 beacon->head_len +
2143 beacon->tail_len + 256);
2144 if (!skb)
2145 goto out;
2146
2147 skb_reserve(skb, local->tx_headroom);
2148 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2149 beacon->head_len);
2150
2151 /*
2152 * Not very nice, but we want to allow the driver to call
2153 * ieee80211_beacon_get() as a response to the set_tim()
2154 * callback. That, however, is already invoked under the
2155 * sta_lock to guarantee consistent and race-free update
2156 * of the tim bitmap in mac80211 and the driver.
2157 */
2158 if (local->tim_in_locked_section) {
2159 ieee80211_beacon_add_tim(ap, skb, beacon);
2160 } else {
2161 unsigned long flags;
2162
2163 spin_lock_irqsave(&local->sta_lock, flags);
2164 ieee80211_beacon_add_tim(ap, skb, beacon);
2165 spin_unlock_irqrestore(&local->sta_lock, flags);
2166 }
2167
2168 if (tim_offset)
2169 *tim_offset = beacon->head_len;
2170 if (tim_length)
2171 *tim_length = skb->len - beacon->head_len;
2172
2173 if (beacon->tail)
2174 memcpy(skb_put(skb, beacon->tail_len),
2175 beacon->tail, beacon->tail_len);
2176 } else
2177 goto out;
2178 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2179 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2180 struct ieee80211_hdr *hdr;
2181 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2182
2183 if (!presp)
2184 goto out;
2185
2186 skb = skb_copy(presp, GFP_ATOMIC);
2187 if (!skb)
2188 goto out;
2189
2190 hdr = (struct ieee80211_hdr *) skb->data;
2191 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2192 IEEE80211_STYPE_BEACON);
2193 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2194 struct ieee80211_mgmt *mgmt;
2195 u8 *pos;
2196
2197 /* headroom, head length, tail length and maximum TIM length */
2198 skb = dev_alloc_skb(local->tx_headroom + 400);
2199 if (!skb)
2200 goto out;
2201
2202 skb_reserve(skb, local->hw.extra_tx_headroom);
2203 mgmt = (struct ieee80211_mgmt *)
2204 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2205 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2206 mgmt->frame_control =
2207 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2208 memset(mgmt->da, 0xff, ETH_ALEN);
2209 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2210 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2211 mgmt->u.beacon.beacon_int =
2212 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2213 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2214
2215 pos = skb_put(skb, 2);
2216 *pos++ = WLAN_EID_SSID;
2217 *pos++ = 0x0;
2218
2219 mesh_mgmt_ies_add(skb, sdata);
2220 } else {
2221 WARN_ON(1);
2222 goto out;
2223 }
2224
2225 info = IEEE80211_SKB_CB(skb);
2226
2227 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2228 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2229 info->band = band;
2230
2231 memset(&txrc, 0, sizeof(txrc));
2232 txrc.hw = hw;
2233 txrc.sband = sband;
2234 txrc.bss_conf = &sdata->vif.bss_conf;
2235 txrc.skb = skb;
2236 txrc.reported_rate.idx = -1;
2237 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2238 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2239 txrc.max_rate_idx = -1;
2240 else
2241 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2242 txrc.ap = true;
2243 rate_control_get_rate(sdata, NULL, &txrc);
2244
2245 info->control.vif = vif;
2246
2247 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
2248 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2249 out:
2250 rcu_read_unlock();
2251 return skb;
2252 }
2253 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2254
2255 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2256 struct ieee80211_vif *vif)
2257 {
2258 struct ieee80211_sub_if_data *sdata;
2259 struct ieee80211_if_managed *ifmgd;
2260 struct ieee80211_pspoll *pspoll;
2261 struct ieee80211_local *local;
2262 struct sk_buff *skb;
2263
2264 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2265 return NULL;
2266
2267 sdata = vif_to_sdata(vif);
2268 ifmgd = &sdata->u.mgd;
2269 local = sdata->local;
2270
2271 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2272 if (!skb) {
2273 printk(KERN_DEBUG "%s: failed to allocate buffer for "
2274 "pspoll template\n", sdata->name);
2275 return NULL;
2276 }
2277 skb_reserve(skb, local->hw.extra_tx_headroom);
2278
2279 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2280 memset(pspoll, 0, sizeof(*pspoll));
2281 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2282 IEEE80211_STYPE_PSPOLL);
2283 pspoll->aid = cpu_to_le16(ifmgd->aid);
2284
2285 /* aid in PS-Poll has its two MSBs each set to 1 */
2286 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2287
2288 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2289 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2290
2291 return skb;
2292 }
2293 EXPORT_SYMBOL(ieee80211_pspoll_get);
2294
2295 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2296 struct ieee80211_vif *vif)
2297 {
2298 struct ieee80211_hdr_3addr *nullfunc;
2299 struct ieee80211_sub_if_data *sdata;
2300 struct ieee80211_if_managed *ifmgd;
2301 struct ieee80211_local *local;
2302 struct sk_buff *skb;
2303
2304 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2305 return NULL;
2306
2307 sdata = vif_to_sdata(vif);
2308 ifmgd = &sdata->u.mgd;
2309 local = sdata->local;
2310
2311 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2312 if (!skb) {
2313 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2314 "template\n", sdata->name);
2315 return NULL;
2316 }
2317 skb_reserve(skb, local->hw.extra_tx_headroom);
2318
2319 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2320 sizeof(*nullfunc));
2321 memset(nullfunc, 0, sizeof(*nullfunc));
2322 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2323 IEEE80211_STYPE_NULLFUNC |
2324 IEEE80211_FCTL_TODS);
2325 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2326 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2327 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2328
2329 return skb;
2330 }
2331 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2332
2333 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2334 struct ieee80211_vif *vif,
2335 const u8 *ssid, size_t ssid_len,
2336 const u8 *ie, size_t ie_len)
2337 {
2338 struct ieee80211_sub_if_data *sdata;
2339 struct ieee80211_local *local;
2340 struct ieee80211_hdr_3addr *hdr;
2341 struct sk_buff *skb;
2342 size_t ie_ssid_len;
2343 u8 *pos;
2344
2345 sdata = vif_to_sdata(vif);
2346 local = sdata->local;
2347 ie_ssid_len = 2 + ssid_len;
2348
2349 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2350 ie_ssid_len + ie_len);
2351 if (!skb) {
2352 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
2353 "request template\n", sdata->name);
2354 return NULL;
2355 }
2356
2357 skb_reserve(skb, local->hw.extra_tx_headroom);
2358
2359 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2360 memset(hdr, 0, sizeof(*hdr));
2361 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2362 IEEE80211_STYPE_PROBE_REQ);
2363 memset(hdr->addr1, 0xff, ETH_ALEN);
2364 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2365 memset(hdr->addr3, 0xff, ETH_ALEN);
2366
2367 pos = skb_put(skb, ie_ssid_len);
2368 *pos++ = WLAN_EID_SSID;
2369 *pos++ = ssid_len;
2370 if (ssid)
2371 memcpy(pos, ssid, ssid_len);
2372 pos += ssid_len;
2373
2374 if (ie) {
2375 pos = skb_put(skb, ie_len);
2376 memcpy(pos, ie, ie_len);
2377 }
2378
2379 return skb;
2380 }
2381 EXPORT_SYMBOL(ieee80211_probereq_get);
2382
2383 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2384 const void *frame, size_t frame_len,
2385 const struct ieee80211_tx_info *frame_txctl,
2386 struct ieee80211_rts *rts)
2387 {
2388 const struct ieee80211_hdr *hdr = frame;
2389
2390 rts->frame_control =
2391 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2392 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2393 frame_txctl);
2394 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2395 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2396 }
2397 EXPORT_SYMBOL(ieee80211_rts_get);
2398
2399 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2400 const void *frame, size_t frame_len,
2401 const struct ieee80211_tx_info *frame_txctl,
2402 struct ieee80211_cts *cts)
2403 {
2404 const struct ieee80211_hdr *hdr = frame;
2405
2406 cts->frame_control =
2407 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2408 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2409 frame_len, frame_txctl);
2410 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2411 }
2412 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2413
2414 struct sk_buff *
2415 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2416 struct ieee80211_vif *vif)
2417 {
2418 struct ieee80211_local *local = hw_to_local(hw);
2419 struct sk_buff *skb = NULL;
2420 struct sta_info *sta;
2421 struct ieee80211_tx_data tx;
2422 struct ieee80211_sub_if_data *sdata;
2423 struct ieee80211_if_ap *bss = NULL;
2424 struct beacon_data *beacon;
2425 struct ieee80211_tx_info *info;
2426
2427 sdata = vif_to_sdata(vif);
2428 bss = &sdata->u.ap;
2429
2430 rcu_read_lock();
2431 beacon = rcu_dereference(bss->beacon);
2432
2433 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2434 goto out;
2435
2436 if (bss->dtim_count != 0)
2437 goto out; /* send buffered bc/mc only after DTIM beacon */
2438
2439 while (1) {
2440 skb = skb_dequeue(&bss->ps_bc_buf);
2441 if (!skb)
2442 goto out;
2443 local->total_ps_buffered--;
2444
2445 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2446 struct ieee80211_hdr *hdr =
2447 (struct ieee80211_hdr *) skb->data;
2448 /* more buffered multicast/broadcast frames ==> set
2449 * MoreData flag in IEEE 802.11 header to inform PS
2450 * STAs */
2451 hdr->frame_control |=
2452 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2453 }
2454
2455 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2456 break;
2457 dev_kfree_skb_any(skb);
2458 }
2459
2460 info = IEEE80211_SKB_CB(skb);
2461
2462 sta = tx.sta;
2463 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2464 tx.channel = local->hw.conf.channel;
2465 info->band = tx.channel->band;
2466
2467 if (invoke_tx_handlers(&tx))
2468 skb = NULL;
2469 out:
2470 rcu_read_unlock();
2471
2472 return skb;
2473 }
2474 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2475
2476 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2477 {
2478 skb_set_mac_header(skb, 0);
2479 skb_set_network_header(skb, 0);
2480 skb_set_transport_header(skb, 0);
2481
2482 /* send all internal mgmt frames on VO */
2483 skb_set_queue_mapping(skb, 0);
2484
2485 /*
2486 * The other path calling ieee80211_xmit is from the tasklet,
2487 * and while we can handle concurrent transmissions locking
2488 * requirements are that we do not come into tx with bhs on.
2489 */
2490 local_bh_disable();
2491 ieee80211_xmit(sdata, skb);
2492 local_bh_enable();
2493 }
Mirror of the linux-mips.org kernel tree