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[linux-2.6/mini2440.git] / net / mac80211 / tx.c
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1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "led.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "wpa.h"
32 #include "wme.h"
33 #include "rate.h"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_PENDING 2
39 /* misc utils */
41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
42 int next_frag_len)
44 int rate, mrate, erp, dur, i;
45 struct ieee80211_rate *txrate;
46 struct ieee80211_local *local = tx->local;
47 struct ieee80211_supported_band *sband;
48 struct ieee80211_hdr *hdr;
49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
51 /* assume HW handles this */
52 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
53 return 0;
55 /* uh huh? */
56 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
57 return 0;
59 sband = local->hw.wiphy->bands[tx->channel->band];
60 txrate = &sband->bitrates[info->control.rates[0].idx];
62 erp = txrate->flags & IEEE80211_RATE_ERP_G;
65 * data and mgmt (except PS Poll):
66 * - during CFP: 32768
67 * - during contention period:
68 * if addr1 is group address: 0
69 * if more fragments = 0 and addr1 is individual address: time to
70 * transmit one ACK plus SIFS
71 * if more fragments = 1 and addr1 is individual address: time to
72 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * IEEE 802.11, 9.6:
75 * - control response frame (CTS or ACK) shall be transmitted using the
76 * same rate as the immediately previous frame in the frame exchange
77 * sequence, if this rate belongs to the PHY mandatory rates, or else
78 * at the highest possible rate belonging to the PHY rates in the
79 * BSSBasicRateSet
81 hdr = (struct ieee80211_hdr *)tx->skb->data;
82 if (ieee80211_is_ctl(hdr->frame_control)) {
83 /* TODO: These control frames are not currently sent by
84 * mac80211, but should they be implemented, this function
85 * needs to be updated to support duration field calculation.
87 * RTS: time needed to transmit pending data/mgmt frame plus
88 * one CTS frame plus one ACK frame plus 3 x SIFS
89 * CTS: duration of immediately previous RTS minus time
90 * required to transmit CTS and its SIFS
91 * ACK: 0 if immediately previous directed data/mgmt had
92 * more=0, with more=1 duration in ACK frame is duration
93 * from previous frame minus time needed to transmit ACK
94 * and its SIFS
95 * PS Poll: BIT(15) | BIT(14) | aid
97 return 0;
100 /* data/mgmt */
101 if (0 /* FIX: data/mgmt during CFP */)
102 return cpu_to_le16(32768);
104 if (group_addr) /* Group address as the destination - no ACK */
105 return 0;
107 /* Individual destination address:
108 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
109 * CTS and ACK frames shall be transmitted using the highest rate in
110 * basic rate set that is less than or equal to the rate of the
111 * immediately previous frame and that is using the same modulation
112 * (CCK or OFDM). If no basic rate set matches with these requirements,
113 * the highest mandatory rate of the PHY that is less than or equal to
114 * the rate of the previous frame is used.
115 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 rate = -1;
118 /* use lowest available if everything fails */
119 mrate = sband->bitrates[0].bitrate;
120 for (i = 0; i < sband->n_bitrates; i++) {
121 struct ieee80211_rate *r = &sband->bitrates[i];
123 if (r->bitrate > txrate->bitrate)
124 break;
126 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
127 rate = r->bitrate;
129 switch (sband->band) {
130 case IEEE80211_BAND_2GHZ: {
131 u32 flag;
132 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
133 flag = IEEE80211_RATE_MANDATORY_G;
134 else
135 flag = IEEE80211_RATE_MANDATORY_B;
136 if (r->flags & flag)
137 mrate = r->bitrate;
138 break;
140 case IEEE80211_BAND_5GHZ:
141 if (r->flags & IEEE80211_RATE_MANDATORY_A)
142 mrate = r->bitrate;
143 break;
144 case IEEE80211_NUM_BANDS:
145 WARN_ON(1);
146 break;
149 if (rate == -1) {
150 /* No matching basic rate found; use highest suitable mandatory
151 * PHY rate */
152 rate = mrate;
155 /* Time needed to transmit ACK
156 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
157 * to closest integer */
159 dur = ieee80211_frame_duration(local, 10, rate, erp,
160 tx->sdata->vif.bss_conf.use_short_preamble);
162 if (next_frag_len) {
163 /* Frame is fragmented: duration increases with time needed to
164 * transmit next fragment plus ACK and 2 x SIFS. */
165 dur *= 2; /* ACK + SIFS */
166 /* next fragment */
167 dur += ieee80211_frame_duration(local, next_frag_len,
168 txrate->bitrate, erp,
169 tx->sdata->vif.bss_conf.use_short_preamble);
172 return cpu_to_le16(dur);
175 static int inline is_ieee80211_device(struct ieee80211_local *local,
176 struct net_device *dev)
178 return local == wdev_priv(dev->ieee80211_ptr);
181 /* tx handlers */
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
187 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
188 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
189 u32 sta_flags;
191 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
192 return TX_CONTINUE;
194 if (unlikely(tx->local->sw_scanning) &&
195 !ieee80211_is_probe_req(hdr->frame_control) &&
196 !ieee80211_is_nullfunc(hdr->frame_control))
198 * When software scanning only nullfunc frames (to notify
199 * the sleep state to the AP) and probe requests (for the
200 * active scan) are allowed, all other frames should not be
201 * sent and we should not get here, but if we do
202 * nonetheless, drop them to avoid sending them
203 * off-channel. See the link below and
204 * ieee80211_start_scan() for more.
206 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
208 return TX_DROP;
210 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
211 return TX_CONTINUE;
213 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
214 return TX_CONTINUE;
216 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
218 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
219 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
220 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
221 ieee80211_is_data(hdr->frame_control))) {
222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
223 printk(KERN_DEBUG "%s: dropped data frame to not "
224 "associated station %pM\n",
225 tx->dev->name, hdr->addr1);
226 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
227 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
228 return TX_DROP;
230 } else {
231 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
232 tx->local->num_sta == 0 &&
233 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
235 * No associated STAs - no need to send multicast
236 * frames.
238 return TX_DROP;
240 return TX_CONTINUE;
243 return TX_CONTINUE;
246 /* This function is called whenever the AP is about to exceed the maximum limit
247 * of buffered frames for power saving STAs. This situation should not really
248 * happen often during normal operation, so dropping the oldest buffered packet
249 * from each queue should be OK to make some room for new frames. */
250 static void purge_old_ps_buffers(struct ieee80211_local *local)
252 int total = 0, purged = 0;
253 struct sk_buff *skb;
254 struct ieee80211_sub_if_data *sdata;
255 struct sta_info *sta;
258 * virtual interfaces are protected by RCU
260 rcu_read_lock();
262 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
263 struct ieee80211_if_ap *ap;
264 if (sdata->vif.type != NL80211_IFTYPE_AP)
265 continue;
266 ap = &sdata->u.ap;
267 skb = skb_dequeue(&ap->ps_bc_buf);
268 if (skb) {
269 purged++;
270 dev_kfree_skb(skb);
272 total += skb_queue_len(&ap->ps_bc_buf);
275 list_for_each_entry_rcu(sta, &local->sta_list, list) {
276 skb = skb_dequeue(&sta->ps_tx_buf);
277 if (skb) {
278 purged++;
279 dev_kfree_skb(skb);
281 total += skb_queue_len(&sta->ps_tx_buf);
284 rcu_read_unlock();
286 local->total_ps_buffered = total;
287 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
288 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
289 wiphy_name(local->hw.wiphy), purged);
290 #endif
293 static ieee80211_tx_result
294 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
300 * broadcast/multicast frame
302 * If any of the associated stations is in power save mode,
303 * the frame is buffered to be sent after DTIM beacon frame.
304 * This is done either by the hardware or us.
307 /* powersaving STAs only in AP/VLAN mode */
308 if (!tx->sdata->bss)
309 return TX_CONTINUE;
311 /* no buffering for ordered frames */
312 if (ieee80211_has_order(hdr->frame_control))
313 return TX_CONTINUE;
315 /* no stations in PS mode */
316 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
317 return TX_CONTINUE;
319 /* buffered in mac80211 */
320 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
321 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
322 purge_old_ps_buffers(tx->local);
323 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
324 AP_MAX_BC_BUFFER) {
325 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
326 if (net_ratelimit()) {
327 printk(KERN_DEBUG "%s: BC TX buffer full - "
328 "dropping the oldest frame\n",
329 tx->dev->name);
331 #endif
332 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
333 } else
334 tx->local->total_ps_buffered++;
335 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
336 return TX_QUEUED;
339 /* buffered in hardware */
340 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
342 return TX_CONTINUE;
345 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
346 struct sk_buff *skb)
348 if (!ieee80211_is_mgmt(fc))
349 return 0;
351 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
352 return 0;
354 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
355 skb->data))
356 return 0;
358 return 1;
361 static ieee80211_tx_result
362 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
364 struct sta_info *sta = tx->sta;
365 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
367 u32 staflags;
369 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
370 return TX_CONTINUE;
372 staflags = get_sta_flags(sta);
374 if (unlikely((staflags & WLAN_STA_PS) &&
375 !(staflags & WLAN_STA_PSPOLL))) {
376 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
377 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
378 "before %d)\n",
379 sta->sta.addr, sta->sta.aid,
380 skb_queue_len(&sta->ps_tx_buf));
381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
382 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
383 purge_old_ps_buffers(tx->local);
384 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
385 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
386 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
387 if (net_ratelimit()) {
388 printk(KERN_DEBUG "%s: STA %pM TX "
389 "buffer full - dropping oldest frame\n",
390 tx->dev->name, sta->sta.addr);
392 #endif
393 dev_kfree_skb(old);
394 } else
395 tx->local->total_ps_buffered++;
397 /* Queue frame to be sent after STA sends an PS Poll frame */
398 if (skb_queue_empty(&sta->ps_tx_buf))
399 sta_info_set_tim_bit(sta);
401 info->control.jiffies = jiffies;
402 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
403 return TX_QUEUED;
405 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
406 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
407 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
408 "set -> send frame\n", tx->dev->name,
409 sta->sta.addr);
411 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
412 clear_sta_flags(sta, WLAN_STA_PSPOLL);
414 return TX_CONTINUE;
417 static ieee80211_tx_result debug_noinline
418 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
420 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
421 return TX_CONTINUE;
423 if (tx->flags & IEEE80211_TX_UNICAST)
424 return ieee80211_tx_h_unicast_ps_buf(tx);
425 else
426 return ieee80211_tx_h_multicast_ps_buf(tx);
429 static ieee80211_tx_result debug_noinline
430 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
432 struct ieee80211_key *key;
433 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
434 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
436 if (unlikely(tx->skb->do_not_encrypt))
437 tx->key = NULL;
438 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
439 tx->key = key;
440 else if (ieee80211_is_mgmt(hdr->frame_control) &&
441 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
442 tx->key = key;
443 else if ((key = rcu_dereference(tx->sdata->default_key)))
444 tx->key = key;
445 else if (tx->sdata->drop_unencrypted &&
446 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
447 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
448 (!ieee80211_is_robust_mgmt_frame(hdr) ||
449 (ieee80211_is_action(hdr->frame_control) &&
450 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
451 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
452 return TX_DROP;
453 } else
454 tx->key = NULL;
456 if (tx->key) {
457 tx->key->tx_rx_count++;
458 /* TODO: add threshold stuff again */
460 switch (tx->key->conf.alg) {
461 case ALG_WEP:
462 if (ieee80211_is_auth(hdr->frame_control))
463 break;
464 case ALG_TKIP:
465 if (!ieee80211_is_data_present(hdr->frame_control))
466 tx->key = NULL;
467 break;
468 case ALG_CCMP:
469 if (!ieee80211_is_data_present(hdr->frame_control) &&
470 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
471 tx->skb))
472 tx->key = NULL;
473 break;
474 case ALG_AES_CMAC:
475 if (!ieee80211_is_mgmt(hdr->frame_control))
476 tx->key = NULL;
477 break;
481 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
482 tx->skb->do_not_encrypt = 1;
484 return TX_CONTINUE;
487 static ieee80211_tx_result debug_noinline
488 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
490 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
491 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
492 struct ieee80211_supported_band *sband;
493 struct ieee80211_rate *rate;
494 int i, len;
495 bool inval = false, rts = false, short_preamble = false;
496 struct ieee80211_tx_rate_control txrc;
498 memset(&txrc, 0, sizeof(txrc));
500 sband = tx->local->hw.wiphy->bands[tx->channel->band];
502 len = min_t(int, tx->skb->len + FCS_LEN,
503 tx->local->fragmentation_threshold);
505 /* set up the tx rate control struct we give the RC algo */
506 txrc.hw = local_to_hw(tx->local);
507 txrc.sband = sband;
508 txrc.bss_conf = &tx->sdata->vif.bss_conf;
509 txrc.skb = tx->skb;
510 txrc.reported_rate.idx = -1;
511 txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
513 /* set up RTS protection if desired */
514 if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD &&
515 len > tx->local->rts_threshold) {
516 txrc.rts = rts = true;
520 * Use short preamble if the BSS can handle it, but not for
521 * management frames unless we know the receiver can handle
522 * that -- the management frame might be to a station that
523 * just wants a probe response.
525 if (tx->sdata->vif.bss_conf.use_short_preamble &&
526 (ieee80211_is_data(hdr->frame_control) ||
527 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
528 txrc.short_preamble = short_preamble = true;
531 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
533 if (unlikely(info->control.rates[0].idx < 0))
534 return TX_DROP;
536 if (txrc.reported_rate.idx < 0)
537 txrc.reported_rate = info->control.rates[0];
539 if (tx->sta)
540 tx->sta->last_tx_rate = txrc.reported_rate;
542 if (unlikely(!info->control.rates[0].count))
543 info->control.rates[0].count = 1;
545 if (is_multicast_ether_addr(hdr->addr1)) {
547 * XXX: verify the rate is in the basic rateset
549 return TX_CONTINUE;
553 * set up the RTS/CTS rate as the fastest basic rate
554 * that is not faster than the data rate
556 * XXX: Should this check all retry rates?
558 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
559 s8 baserate = 0;
561 rate = &sband->bitrates[info->control.rates[0].idx];
563 for (i = 0; i < sband->n_bitrates; i++) {
564 /* must be a basic rate */
565 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
566 continue;
567 /* must not be faster than the data rate */
568 if (sband->bitrates[i].bitrate > rate->bitrate)
569 continue;
570 /* maximum */
571 if (sband->bitrates[baserate].bitrate <
572 sband->bitrates[i].bitrate)
573 baserate = i;
576 info->control.rts_cts_rate_idx = baserate;
579 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
581 * make sure there's no valid rate following
582 * an invalid one, just in case drivers don't
583 * take the API seriously to stop at -1.
585 if (inval) {
586 info->control.rates[i].idx = -1;
587 continue;
589 if (info->control.rates[i].idx < 0) {
590 inval = true;
591 continue;
595 * For now assume MCS is already set up correctly, this
596 * needs to be fixed.
598 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
599 WARN_ON(info->control.rates[i].idx > 76);
600 continue;
603 /* set up RTS protection if desired */
604 if (rts)
605 info->control.rates[i].flags |=
606 IEEE80211_TX_RC_USE_RTS_CTS;
608 /* RC is busted */
609 if (WARN_ON_ONCE(info->control.rates[i].idx >=
610 sband->n_bitrates)) {
611 info->control.rates[i].idx = -1;
612 continue;
615 rate = &sband->bitrates[info->control.rates[i].idx];
617 /* set up short preamble */
618 if (short_preamble &&
619 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
620 info->control.rates[i].flags |=
621 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
623 /* set up G protection */
624 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
625 rate->flags & IEEE80211_RATE_ERP_G)
626 info->control.rates[i].flags |=
627 IEEE80211_TX_RC_USE_CTS_PROTECT;
630 return TX_CONTINUE;
633 static ieee80211_tx_result debug_noinline
634 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
636 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
638 if (tx->sta)
639 info->control.sta = &tx->sta->sta;
641 return TX_CONTINUE;
644 static ieee80211_tx_result debug_noinline
645 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
647 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
648 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
649 u16 *seq;
650 u8 *qc;
651 int tid;
654 * Packet injection may want to control the sequence
655 * number, if we have no matching interface then we
656 * neither assign one ourselves nor ask the driver to.
658 if (unlikely(!info->control.vif))
659 return TX_CONTINUE;
661 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
662 return TX_CONTINUE;
664 if (ieee80211_hdrlen(hdr->frame_control) < 24)
665 return TX_CONTINUE;
668 * Anything but QoS data that has a sequence number field
669 * (is long enough) gets a sequence number from the global
670 * counter.
672 if (!ieee80211_is_data_qos(hdr->frame_control)) {
673 /* driver should assign sequence number */
674 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
675 /* for pure STA mode without beacons, we can do it */
676 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
677 tx->sdata->sequence_number += 0x10;
678 tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
679 return TX_CONTINUE;
683 * This should be true for injected/management frames only, for
684 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
685 * above since they are not QoS-data frames.
687 if (!tx->sta)
688 return TX_CONTINUE;
690 /* include per-STA, per-TID sequence counter */
692 qc = ieee80211_get_qos_ctl(hdr);
693 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
694 seq = &tx->sta->tid_seq[tid];
696 hdr->seq_ctrl = cpu_to_le16(*seq);
698 /* Increase the sequence number. */
699 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
701 return TX_CONTINUE;
704 static int ieee80211_fragment(struct ieee80211_local *local,
705 struct sk_buff *skb, int hdrlen,
706 int frag_threshold)
708 struct sk_buff *tail = skb, *tmp;
709 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
710 int pos = hdrlen + per_fragm;
711 int rem = skb->len - hdrlen - per_fragm;
713 if (WARN_ON(rem < 0))
714 return -EINVAL;
716 while (rem) {
717 int fraglen = per_fragm;
719 if (fraglen > rem)
720 fraglen = rem;
721 rem -= fraglen;
722 tmp = dev_alloc_skb(local->tx_headroom +
723 frag_threshold +
724 IEEE80211_ENCRYPT_HEADROOM +
725 IEEE80211_ENCRYPT_TAILROOM);
726 if (!tmp)
727 return -ENOMEM;
728 tail->next = tmp;
729 tail = tmp;
730 skb_reserve(tmp, local->tx_headroom +
731 IEEE80211_ENCRYPT_HEADROOM);
732 /* copy control information */
733 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
734 skb_copy_queue_mapping(tmp, skb);
735 tmp->priority = skb->priority;
736 tmp->do_not_encrypt = skb->do_not_encrypt;
737 tmp->dev = skb->dev;
738 tmp->iif = skb->iif;
740 /* copy header and data */
741 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
742 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
744 pos += fraglen;
747 skb->len = hdrlen + per_fragm;
748 return 0;
751 static ieee80211_tx_result debug_noinline
752 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
754 struct sk_buff *skb = tx->skb;
755 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
756 struct ieee80211_hdr *hdr = (void *)skb->data;
757 int frag_threshold = tx->local->fragmentation_threshold;
758 int hdrlen;
759 int fragnum;
761 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
762 return TX_CONTINUE;
765 * Warn when submitting a fragmented A-MPDU frame and drop it.
766 * This scenario is handled in __ieee80211_tx_prepare but extra
767 * caution taken here as fragmented ampdu may cause Tx stop.
769 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
770 return TX_DROP;
772 hdrlen = ieee80211_hdrlen(hdr->frame_control);
774 /* internal error, why is TX_FRAGMENTED set? */
775 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
776 return TX_DROP;
779 * Now fragment the frame. This will allocate all the fragments and
780 * chain them (using skb as the first fragment) to skb->next.
781 * During transmission, we will remove the successfully transmitted
782 * fragments from this list. When the low-level driver rejects one
783 * of the fragments then we will simply pretend to accept the skb
784 * but store it away as pending.
786 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
787 return TX_DROP;
789 /* update duration/seq/flags of fragments */
790 fragnum = 0;
791 do {
792 int next_len;
793 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
795 hdr = (void *)skb->data;
796 info = IEEE80211_SKB_CB(skb);
798 if (skb->next) {
799 hdr->frame_control |= morefrags;
800 next_len = skb->next->len;
802 * No multi-rate retries for fragmented frames, that
803 * would completely throw off the NAV at other STAs.
805 info->control.rates[1].idx = -1;
806 info->control.rates[2].idx = -1;
807 info->control.rates[3].idx = -1;
808 info->control.rates[4].idx = -1;
809 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
810 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
811 } else {
812 hdr->frame_control &= ~morefrags;
813 next_len = 0;
815 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
816 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
817 fragnum++;
818 } while ((skb = skb->next));
820 return TX_CONTINUE;
823 static ieee80211_tx_result debug_noinline
824 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
826 if (!tx->key)
827 return TX_CONTINUE;
829 switch (tx->key->conf.alg) {
830 case ALG_WEP:
831 return ieee80211_crypto_wep_encrypt(tx);
832 case ALG_TKIP:
833 return ieee80211_crypto_tkip_encrypt(tx);
834 case ALG_CCMP:
835 return ieee80211_crypto_ccmp_encrypt(tx);
836 case ALG_AES_CMAC:
837 return ieee80211_crypto_aes_cmac_encrypt(tx);
840 /* not reached */
841 WARN_ON(1);
842 return TX_DROP;
845 static ieee80211_tx_result debug_noinline
846 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
848 struct sk_buff *skb = tx->skb;
849 struct ieee80211_hdr *hdr;
850 int next_len;
851 bool group_addr;
853 do {
854 hdr = (void *) skb->data;
855 next_len = skb->next ? skb->next->len : 0;
856 group_addr = is_multicast_ether_addr(hdr->addr1);
858 hdr->duration_id =
859 ieee80211_duration(tx, group_addr, next_len);
860 } while ((skb = skb->next));
862 return TX_CONTINUE;
865 static ieee80211_tx_result debug_noinline
866 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
868 struct sk_buff *skb = tx->skb;
870 if (!tx->sta)
871 return TX_CONTINUE;
873 tx->sta->tx_packets++;
874 do {
875 tx->sta->tx_fragments++;
876 tx->sta->tx_bytes += skb->len;
877 } while ((skb = skb->next));
879 return TX_CONTINUE;
882 /* actual transmit path */
885 * deal with packet injection down monitor interface
886 * with Radiotap Header -- only called for monitor mode interface
888 static ieee80211_tx_result
889 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
890 struct sk_buff *skb)
893 * this is the moment to interpret and discard the radiotap header that
894 * must be at the start of the packet injected in Monitor mode
896 * Need to take some care with endian-ness since radiotap
897 * args are little-endian
900 struct ieee80211_radiotap_iterator iterator;
901 struct ieee80211_radiotap_header *rthdr =
902 (struct ieee80211_radiotap_header *) skb->data;
903 struct ieee80211_supported_band *sband;
904 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
906 sband = tx->local->hw.wiphy->bands[tx->channel->band];
908 skb->do_not_encrypt = 1;
909 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
912 * for every radiotap entry that is present
913 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
914 * entries present, or -EINVAL on error)
917 while (!ret) {
918 ret = ieee80211_radiotap_iterator_next(&iterator);
920 if (ret)
921 continue;
923 /* see if this argument is something we can use */
924 switch (iterator.this_arg_index) {
926 * You must take care when dereferencing iterator.this_arg
927 * for multibyte types... the pointer is not aligned. Use
928 * get_unaligned((type *)iterator.this_arg) to dereference
929 * iterator.this_arg for type "type" safely on all arches.
931 case IEEE80211_RADIOTAP_FLAGS:
932 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
934 * this indicates that the skb we have been
935 * handed has the 32-bit FCS CRC at the end...
936 * we should react to that by snipping it off
937 * because it will be recomputed and added
938 * on transmission
940 if (skb->len < (iterator.max_length + FCS_LEN))
941 return TX_DROP;
943 skb_trim(skb, skb->len - FCS_LEN);
945 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
946 tx->skb->do_not_encrypt = 0;
947 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
948 tx->flags |= IEEE80211_TX_FRAGMENTED;
949 break;
952 * Please update the file
953 * Documentation/networking/mac80211-injection.txt
954 * when parsing new fields here.
957 default:
958 break;
962 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
963 return TX_DROP;
966 * remove the radiotap header
967 * iterator->max_length was sanity-checked against
968 * skb->len by iterator init
970 skb_pull(skb, iterator.max_length);
972 return TX_CONTINUE;
976 * initialises @tx
978 static ieee80211_tx_result
979 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
980 struct sk_buff *skb,
981 struct net_device *dev)
983 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
984 struct ieee80211_hdr *hdr;
985 struct ieee80211_sub_if_data *sdata;
986 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
987 int hdrlen, tid;
988 u8 *qc, *state;
989 bool queued = false;
991 memset(tx, 0, sizeof(*tx));
992 tx->skb = skb;
993 tx->dev = dev; /* use original interface */
994 tx->local = local;
995 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
996 tx->channel = local->hw.conf.channel;
998 * Set this flag (used below to indicate "automatic fragmentation"),
999 * it will be cleared/left by radiotap as desired.
1001 tx->flags |= IEEE80211_TX_FRAGMENTED;
1003 /* process and remove the injection radiotap header */
1004 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1005 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
1006 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
1007 return TX_DROP;
1010 * __ieee80211_parse_tx_radiotap has now removed
1011 * the radiotap header that was present and pre-filled
1012 * 'tx' with tx control information.
1017 * If this flag is set to true anywhere, and we get here,
1018 * we are doing the needed processing, so remove the flag
1019 * now.
1021 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1023 hdr = (struct ieee80211_hdr *) skb->data;
1025 tx->sta = sta_info_get(local, hdr->addr1);
1027 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1028 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1029 unsigned long flags;
1030 struct tid_ampdu_tx *tid_tx;
1032 qc = ieee80211_get_qos_ctl(hdr);
1033 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1035 spin_lock_irqsave(&tx->sta->lock, flags);
1037 * XXX: This spinlock could be fairly expensive, but see the
1038 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1039 * One way to solve this would be to do something RCU-like
1040 * for managing the tid_tx struct and using atomic bitops
1041 * for the actual state -- by introducing an actual
1042 * 'operational' bit that would be possible. It would
1043 * require changing ieee80211_agg_tx_operational() to
1044 * set that bit, and changing the way tid_tx is managed
1045 * everywhere, including races between that bit and
1046 * tid_tx going away (tid_tx being added can be easily
1047 * committed to memory before the 'operational' bit).
1049 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1050 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1051 if (*state == HT_AGG_STATE_OPERATIONAL) {
1052 info->flags |= IEEE80211_TX_CTL_AMPDU;
1053 } else if (*state != HT_AGG_STATE_IDLE) {
1054 /* in progress */
1055 queued = true;
1056 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1057 __skb_queue_tail(&tid_tx->pending, skb);
1059 spin_unlock_irqrestore(&tx->sta->lock, flags);
1061 if (unlikely(queued))
1062 return TX_QUEUED;
1065 if (is_multicast_ether_addr(hdr->addr1)) {
1066 tx->flags &= ~IEEE80211_TX_UNICAST;
1067 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1068 } else {
1069 tx->flags |= IEEE80211_TX_UNICAST;
1070 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1073 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1074 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1075 skb->len + FCS_LEN > local->fragmentation_threshold &&
1076 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1077 tx->flags |= IEEE80211_TX_FRAGMENTED;
1078 else
1079 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1082 if (!tx->sta)
1083 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1084 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1085 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1087 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1088 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1089 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1090 tx->ethertype = (pos[0] << 8) | pos[1];
1092 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1094 return TX_CONTINUE;
1098 * NB: @tx is uninitialised when passed in here
1100 static int ieee80211_tx_prepare(struct ieee80211_local *local,
1101 struct ieee80211_tx_data *tx,
1102 struct sk_buff *skb)
1104 struct net_device *dev;
1106 dev = dev_get_by_index(&init_net, skb->iif);
1107 if (unlikely(dev && !is_ieee80211_device(local, dev))) {
1108 dev_put(dev);
1109 dev = NULL;
1111 if (unlikely(!dev))
1112 return -ENODEV;
1114 * initialises tx with control
1116 * return value is safe to ignore here because this function
1117 * can only be invoked for multicast frames
1119 * XXX: clean up
1121 __ieee80211_tx_prepare(tx, skb, dev);
1122 dev_put(dev);
1123 return 0;
1126 static int __ieee80211_tx(struct ieee80211_local *local,
1127 struct sk_buff **skbp,
1128 struct sta_info *sta)
1130 struct sk_buff *skb = *skbp, *next;
1131 struct ieee80211_tx_info *info;
1132 int ret, len;
1133 bool fragm = false;
1135 local->mdev->trans_start = jiffies;
1137 while (skb) {
1138 if (ieee80211_queue_stopped(&local->hw,
1139 skb_get_queue_mapping(skb)))
1140 return IEEE80211_TX_PENDING;
1142 info = IEEE80211_SKB_CB(skb);
1144 if (fragm)
1145 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1146 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1148 next = skb->next;
1149 len = skb->len;
1150 ret = local->ops->tx(local_to_hw(local), skb);
1151 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1152 dev_kfree_skb(skb);
1153 ret = NETDEV_TX_OK;
1155 if (ret != NETDEV_TX_OK)
1156 return IEEE80211_TX_AGAIN;
1157 *skbp = skb = next;
1158 ieee80211_led_tx(local, 1);
1159 fragm = true;
1162 return IEEE80211_TX_OK;
1166 * Invoke TX handlers, return 0 on success and non-zero if the
1167 * frame was dropped or queued.
1169 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1171 struct sk_buff *skb = tx->skb;
1172 ieee80211_tx_result res = TX_DROP;
1174 #define CALL_TXH(txh) \
1175 res = txh(tx); \
1176 if (res != TX_CONTINUE) \
1177 goto txh_done;
1179 CALL_TXH(ieee80211_tx_h_check_assoc)
1180 CALL_TXH(ieee80211_tx_h_ps_buf)
1181 CALL_TXH(ieee80211_tx_h_select_key)
1182 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1183 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1184 CALL_TXH(ieee80211_tx_h_misc)
1185 CALL_TXH(ieee80211_tx_h_sequence)
1186 CALL_TXH(ieee80211_tx_h_fragment)
1187 /* handlers after fragment must be aware of tx info fragmentation! */
1188 CALL_TXH(ieee80211_tx_h_encrypt)
1189 CALL_TXH(ieee80211_tx_h_calculate_duration)
1190 CALL_TXH(ieee80211_tx_h_stats)
1191 #undef CALL_TXH
1193 txh_done:
1194 if (unlikely(res == TX_DROP)) {
1195 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1196 while (skb) {
1197 struct sk_buff *next;
1199 next = skb->next;
1200 dev_kfree_skb(skb);
1201 skb = next;
1203 return -1;
1204 } else if (unlikely(res == TX_QUEUED)) {
1205 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1206 return -1;
1209 return 0;
1212 static void ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1213 bool txpending)
1215 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1216 struct sta_info *sta;
1217 struct ieee80211_tx_data tx;
1218 ieee80211_tx_result res_prepare;
1219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1220 struct sk_buff *next;
1221 unsigned long flags;
1222 int ret, retries;
1223 u16 queue;
1225 queue = skb_get_queue_mapping(skb);
1227 WARN_ON(!txpending && !skb_queue_empty(&local->pending[queue]));
1229 if (unlikely(skb->len < 10)) {
1230 dev_kfree_skb(skb);
1231 return;
1234 rcu_read_lock();
1236 /* initialises tx */
1237 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1239 if (unlikely(res_prepare == TX_DROP)) {
1240 dev_kfree_skb(skb);
1241 rcu_read_unlock();
1242 return;
1243 } else if (unlikely(res_prepare == TX_QUEUED)) {
1244 rcu_read_unlock();
1245 return;
1248 sta = tx.sta;
1249 tx.channel = local->hw.conf.channel;
1250 info->band = tx.channel->band;
1252 if (invoke_tx_handlers(&tx))
1253 goto out;
1255 retries = 0;
1256 retry:
1257 ret = __ieee80211_tx(local, &tx.skb, tx.sta);
1258 switch (ret) {
1259 case IEEE80211_TX_OK:
1260 break;
1261 case IEEE80211_TX_AGAIN:
1263 * Since there are no fragmented frames on A-MPDU
1264 * queues, there's no reason for a driver to reject
1265 * a frame there, warn and drop it.
1267 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1268 goto drop;
1269 /* fall through */
1270 case IEEE80211_TX_PENDING:
1271 skb = tx.skb;
1273 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1275 if (__netif_subqueue_stopped(local->mdev, queue)) {
1276 do {
1277 next = skb->next;
1278 skb->next = NULL;
1279 if (unlikely(txpending))
1280 skb_queue_head(&local->pending[queue],
1281 skb);
1282 else
1283 skb_queue_tail(&local->pending[queue],
1284 skb);
1285 } while ((skb = next));
1288 * Make sure nobody will enable the queue on us
1289 * (without going through the tasklet) nor disable the
1290 * netdev queue underneath the pending handling code.
1292 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING,
1293 &local->queue_stop_reasons[queue]);
1295 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1296 flags);
1297 } else {
1298 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1299 flags);
1301 retries++;
1302 if (WARN(retries > 10, "tx refused but queue active"))
1303 goto drop;
1304 goto retry;
1307 out:
1308 rcu_read_unlock();
1309 return;
1311 drop:
1312 rcu_read_unlock();
1314 skb = tx.skb;
1315 while (skb) {
1316 next = skb->next;
1317 dev_kfree_skb(skb);
1318 skb = next;
1322 /* device xmit handlers */
1324 static int ieee80211_skb_resize(struct ieee80211_local *local,
1325 struct sk_buff *skb,
1326 int head_need, bool may_encrypt)
1328 int tail_need = 0;
1331 * This could be optimised, devices that do full hardware
1332 * crypto (including TKIP MMIC) need no tailroom... But we
1333 * have no drivers for such devices currently.
1335 if (may_encrypt) {
1336 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1337 tail_need -= skb_tailroom(skb);
1338 tail_need = max_t(int, tail_need, 0);
1341 if (head_need || tail_need) {
1342 /* Sorry. Can't account for this any more */
1343 skb_orphan(skb);
1346 if (skb_header_cloned(skb))
1347 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1348 else
1349 I802_DEBUG_INC(local->tx_expand_skb_head);
1351 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1352 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1353 wiphy_name(local->hw.wiphy));
1354 return -ENOMEM;
1357 /* update truesize too */
1358 skb->truesize += head_need + tail_need;
1360 return 0;
1363 int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
1365 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
1366 struct ieee80211_local *local = mpriv->local;
1367 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1368 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1369 struct net_device *odev = NULL;
1370 struct ieee80211_sub_if_data *osdata;
1371 int headroom;
1372 bool may_encrypt;
1373 enum {
1374 NOT_MONITOR,
1375 FOUND_SDATA,
1376 UNKNOWN_ADDRESS,
1377 } monitor_iface = NOT_MONITOR;
1379 if (skb->iif)
1380 odev = dev_get_by_index(&init_net, skb->iif);
1381 if (unlikely(odev && !is_ieee80211_device(local, odev))) {
1382 dev_put(odev);
1383 odev = NULL;
1385 if (unlikely(!odev)) {
1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1387 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1388 "originating device\n", dev->name);
1389 #endif
1390 dev_kfree_skb(skb);
1391 return NETDEV_TX_OK;
1394 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1395 local->hw.conf.dynamic_ps_timeout > 0) {
1396 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1397 ieee80211_stop_queues_by_reason(&local->hw,
1398 IEEE80211_QUEUE_STOP_REASON_PS);
1399 queue_work(local->hw.workqueue,
1400 &local->dynamic_ps_disable_work);
1403 mod_timer(&local->dynamic_ps_timer, jiffies +
1404 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1407 memset(info, 0, sizeof(*info));
1409 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1411 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1413 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1414 ieee80211_is_data(hdr->frame_control)) {
1415 if (is_multicast_ether_addr(hdr->addr3))
1416 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1417 else
1418 if (mesh_nexthop_lookup(skb, osdata)) {
1419 dev_put(odev);
1420 return NETDEV_TX_OK;
1422 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1423 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1424 fwded_frames);
1425 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1426 struct ieee80211_sub_if_data *sdata;
1427 int hdrlen;
1428 u16 len_rthdr;
1430 info->flags |= IEEE80211_TX_CTL_INJECTED;
1431 monitor_iface = UNKNOWN_ADDRESS;
1433 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1434 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1435 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1437 /* check the header is complete in the frame */
1438 if (likely(skb->len >= len_rthdr + hdrlen)) {
1440 * We process outgoing injected frames that have a
1441 * local address we handle as though they are our
1442 * own frames.
1443 * This code here isn't entirely correct, the local
1444 * MAC address is not necessarily enough to find
1445 * the interface to use; for that proper VLAN/WDS
1446 * support we will need a different mechanism.
1449 rcu_read_lock();
1450 list_for_each_entry_rcu(sdata, &local->interfaces,
1451 list) {
1452 if (!netif_running(sdata->dev))
1453 continue;
1454 if (sdata->vif.type != NL80211_IFTYPE_AP)
1455 continue;
1456 if (compare_ether_addr(sdata->dev->dev_addr,
1457 hdr->addr2)) {
1458 dev_hold(sdata->dev);
1459 dev_put(odev);
1460 osdata = sdata;
1461 odev = osdata->dev;
1462 skb->iif = sdata->dev->ifindex;
1463 monitor_iface = FOUND_SDATA;
1464 break;
1467 rcu_read_unlock();
1471 may_encrypt = !skb->do_not_encrypt;
1473 headroom = osdata->local->tx_headroom;
1474 if (may_encrypt)
1475 headroom += IEEE80211_ENCRYPT_HEADROOM;
1476 headroom -= skb_headroom(skb);
1477 headroom = max_t(int, 0, headroom);
1479 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1480 dev_kfree_skb(skb);
1481 dev_put(odev);
1482 return NETDEV_TX_OK;
1485 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1486 osdata = container_of(osdata->bss,
1487 struct ieee80211_sub_if_data,
1488 u.ap);
1489 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1490 info->control.vif = &osdata->vif;
1492 ieee80211_tx(odev, skb, false);
1493 dev_put(odev);
1495 return NETDEV_TX_OK;
1498 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1499 struct net_device *dev)
1501 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1502 struct ieee80211_channel *chan = local->hw.conf.channel;
1503 struct ieee80211_radiotap_header *prthdr =
1504 (struct ieee80211_radiotap_header *)skb->data;
1505 u16 len_rthdr;
1508 * Frame injection is not allowed if beaconing is not allowed
1509 * or if we need radar detection. Beaconing is usually not allowed when
1510 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1511 * Passive scan is also used in world regulatory domains where
1512 * your country is not known and as such it should be treated as
1513 * NO TX unless the channel is explicitly allowed in which case
1514 * your current regulatory domain would not have the passive scan
1515 * flag.
1517 * Since AP mode uses monitor interfaces to inject/TX management
1518 * frames we can make AP mode the exception to this rule once it
1519 * supports radar detection as its implementation can deal with
1520 * radar detection by itself. We can do that later by adding a
1521 * monitor flag interfaces used for AP support.
1523 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1524 IEEE80211_CHAN_PASSIVE_SCAN)))
1525 goto fail;
1527 /* check for not even having the fixed radiotap header part */
1528 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1529 goto fail; /* too short to be possibly valid */
1531 /* is it a header version we can trust to find length from? */
1532 if (unlikely(prthdr->it_version))
1533 goto fail; /* only version 0 is supported */
1535 /* then there must be a radiotap header with a length we can use */
1536 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1538 /* does the skb contain enough to deliver on the alleged length? */
1539 if (unlikely(skb->len < len_rthdr))
1540 goto fail; /* skb too short for claimed rt header extent */
1542 skb->dev = local->mdev;
1544 /* needed because we set skb device to master */
1545 skb->iif = dev->ifindex;
1547 /* sometimes we do encrypt injected frames, will be fixed
1548 * up in radiotap parser if not wanted */
1549 skb->do_not_encrypt = 0;
1552 * fix up the pointers accounting for the radiotap
1553 * header still being in there. We are being given
1554 * a precooked IEEE80211 header so no need for
1555 * normal processing
1557 skb_set_mac_header(skb, len_rthdr);
1559 * these are just fixed to the end of the rt area since we
1560 * don't have any better information and at this point, nobody cares
1562 skb_set_network_header(skb, len_rthdr);
1563 skb_set_transport_header(skb, len_rthdr);
1565 /* pass the radiotap header up to the next stage intact */
1566 dev_queue_xmit(skb);
1567 return NETDEV_TX_OK;
1569 fail:
1570 dev_kfree_skb(skb);
1571 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1575 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1576 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1577 * @skb: packet to be sent
1578 * @dev: incoming interface
1580 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1581 * not be freed, and caller is responsible for either retrying later or freeing
1582 * skb).
1584 * This function takes in an Ethernet header and encapsulates it with suitable
1585 * IEEE 802.11 header based on which interface the packet is coming in. The
1586 * encapsulated packet will then be passed to master interface, wlan#.11, for
1587 * transmission (through low-level driver).
1589 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1590 struct net_device *dev)
1592 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1593 struct ieee80211_local *local = sdata->local;
1594 int ret = 1, head_need;
1595 u16 ethertype, hdrlen, meshhdrlen = 0;
1596 __le16 fc;
1597 struct ieee80211_hdr hdr;
1598 struct ieee80211s_hdr mesh_hdr;
1599 const u8 *encaps_data;
1600 int encaps_len, skip_header_bytes;
1601 int nh_pos, h_pos;
1602 struct sta_info *sta;
1603 u32 sta_flags = 0;
1605 if (unlikely(skb->len < ETH_HLEN)) {
1606 ret = 0;
1607 goto fail;
1610 nh_pos = skb_network_header(skb) - skb->data;
1611 h_pos = skb_transport_header(skb) - skb->data;
1613 /* convert Ethernet header to proper 802.11 header (based on
1614 * operation mode) */
1615 ethertype = (skb->data[12] << 8) | skb->data[13];
1616 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1618 switch (sdata->vif.type) {
1619 case NL80211_IFTYPE_AP:
1620 case NL80211_IFTYPE_AP_VLAN:
1621 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1622 /* DA BSSID SA */
1623 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1624 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1625 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1626 hdrlen = 24;
1627 break;
1628 case NL80211_IFTYPE_WDS:
1629 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1630 /* RA TA DA SA */
1631 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1632 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1633 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1634 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1635 hdrlen = 30;
1636 break;
1637 #ifdef CONFIG_MAC80211_MESH
1638 case NL80211_IFTYPE_MESH_POINT:
1639 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1640 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1641 /* Do not send frames with mesh_ttl == 0 */
1642 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1643 ret = 0;
1644 goto fail;
1646 memset(&mesh_hdr, 0, sizeof(mesh_hdr));
1648 if (compare_ether_addr(dev->dev_addr,
1649 skb->data + ETH_ALEN) == 0) {
1650 /* RA TA DA SA */
1651 memset(hdr.addr1, 0, ETH_ALEN);
1652 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1653 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1654 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1655 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1656 } else {
1657 /* packet from other interface */
1658 struct mesh_path *mppath;
1660 memset(hdr.addr1, 0, ETH_ALEN);
1661 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1662 memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN);
1664 if (is_multicast_ether_addr(skb->data))
1665 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1666 else {
1667 rcu_read_lock();
1668 mppath = mpp_path_lookup(skb->data, sdata);
1669 if (mppath)
1670 memcpy(hdr.addr3, mppath->mpp, ETH_ALEN);
1671 else
1672 memset(hdr.addr3, 0xff, ETH_ALEN);
1673 rcu_read_unlock();
1676 mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6;
1677 mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
1678 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum);
1679 memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN);
1680 memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN);
1681 sdata->u.mesh.mesh_seqnum++;
1682 meshhdrlen = 18;
1684 hdrlen = 30;
1685 break;
1686 #endif
1687 case NL80211_IFTYPE_STATION:
1688 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1689 /* BSSID SA DA */
1690 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1691 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1692 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1693 hdrlen = 24;
1694 break;
1695 case NL80211_IFTYPE_ADHOC:
1696 /* DA SA BSSID */
1697 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1698 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1699 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1700 hdrlen = 24;
1701 break;
1702 default:
1703 ret = 0;
1704 goto fail;
1708 * There's no need to try to look up the destination
1709 * if it is a multicast address (which can only happen
1710 * in AP mode)
1712 if (!is_multicast_ether_addr(hdr.addr1)) {
1713 rcu_read_lock();
1714 sta = sta_info_get(local, hdr.addr1);
1715 if (sta)
1716 sta_flags = get_sta_flags(sta);
1717 rcu_read_unlock();
1720 /* receiver and we are QoS enabled, use a QoS type frame */
1721 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1722 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1723 hdrlen += 2;
1727 * Drop unicast frames to unauthorised stations unless they are
1728 * EAPOL frames from the local station.
1730 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1731 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1732 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1733 !(ethertype == ETH_P_PAE &&
1734 compare_ether_addr(dev->dev_addr,
1735 skb->data + ETH_ALEN) == 0))) {
1736 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1737 if (net_ratelimit())
1738 printk(KERN_DEBUG "%s: dropped frame to %pM"
1739 " (unauthorized port)\n", dev->name,
1740 hdr.addr1);
1741 #endif
1743 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1745 ret = 0;
1746 goto fail;
1749 hdr.frame_control = fc;
1750 hdr.duration_id = 0;
1751 hdr.seq_ctrl = 0;
1753 skip_header_bytes = ETH_HLEN;
1754 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1755 encaps_data = bridge_tunnel_header;
1756 encaps_len = sizeof(bridge_tunnel_header);
1757 skip_header_bytes -= 2;
1758 } else if (ethertype >= 0x600) {
1759 encaps_data = rfc1042_header;
1760 encaps_len = sizeof(rfc1042_header);
1761 skip_header_bytes -= 2;
1762 } else {
1763 encaps_data = NULL;
1764 encaps_len = 0;
1767 skb_pull(skb, skip_header_bytes);
1768 nh_pos -= skip_header_bytes;
1769 h_pos -= skip_header_bytes;
1771 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1774 * So we need to modify the skb header and hence need a copy of
1775 * that. The head_need variable above doesn't, so far, include
1776 * the needed header space that we don't need right away. If we
1777 * can, then we don't reallocate right now but only after the
1778 * frame arrives at the master device (if it does...)
1780 * If we cannot, however, then we will reallocate to include all
1781 * the ever needed space. Also, if we need to reallocate it anyway,
1782 * make it big enough for everything we may ever need.
1785 if (head_need > 0 || skb_cloned(skb)) {
1786 head_need += IEEE80211_ENCRYPT_HEADROOM;
1787 head_need += local->tx_headroom;
1788 head_need = max_t(int, 0, head_need);
1789 if (ieee80211_skb_resize(local, skb, head_need, true))
1790 goto fail;
1793 if (encaps_data) {
1794 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1795 nh_pos += encaps_len;
1796 h_pos += encaps_len;
1799 if (meshhdrlen > 0) {
1800 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1801 nh_pos += meshhdrlen;
1802 h_pos += meshhdrlen;
1805 if (ieee80211_is_data_qos(fc)) {
1806 __le16 *qos_control;
1808 qos_control = (__le16*) skb_push(skb, 2);
1809 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1811 * Maybe we could actually set some fields here, for now just
1812 * initialise to zero to indicate no special operation.
1814 *qos_control = 0;
1815 } else
1816 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1818 nh_pos += hdrlen;
1819 h_pos += hdrlen;
1821 skb->iif = dev->ifindex;
1823 skb->dev = local->mdev;
1824 dev->stats.tx_packets++;
1825 dev->stats.tx_bytes += skb->len;
1827 /* Update skb pointers to various headers since this modified frame
1828 * is going to go through Linux networking code that may potentially
1829 * need things like pointer to IP header. */
1830 skb_set_mac_header(skb, 0);
1831 skb_set_network_header(skb, nh_pos);
1832 skb_set_transport_header(skb, h_pos);
1834 dev->trans_start = jiffies;
1835 dev_queue_xmit(skb);
1837 return 0;
1839 fail:
1840 if (!ret)
1841 dev_kfree_skb(skb);
1843 return ret;
1848 * ieee80211_clear_tx_pending may not be called in a context where
1849 * it is possible that it packets could come in again.
1851 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1853 int i;
1855 for (i = 0; i < local->hw.queues; i++)
1856 skb_queue_purge(&local->pending[i]);
1859 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
1860 struct sk_buff *skb)
1862 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1863 struct ieee80211_sub_if_data *sdata;
1864 struct sta_info *sta;
1865 struct ieee80211_hdr *hdr;
1866 struct net_device *dev;
1867 int ret;
1868 bool result = true;
1870 /* does interface still exist? */
1871 dev = dev_get_by_index(&init_net, skb->iif);
1872 if (!dev) {
1873 dev_kfree_skb(skb);
1874 return true;
1877 /* validate info->control.vif against skb->iif */
1878 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1879 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1880 sdata = container_of(sdata->bss,
1881 struct ieee80211_sub_if_data,
1882 u.ap);
1884 if (unlikely(info->control.vif && info->control.vif != &sdata->vif)) {
1885 dev_kfree_skb(skb);
1886 result = true;
1887 goto out;
1890 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
1891 ieee80211_tx(dev, skb, true);
1892 } else {
1893 hdr = (struct ieee80211_hdr *)skb->data;
1894 sta = sta_info_get(local, hdr->addr1);
1896 ret = __ieee80211_tx(local, &skb, sta);
1897 if (ret != IEEE80211_TX_OK)
1898 result = false;
1901 out:
1902 dev_put(dev);
1904 return result;
1908 * Transmit all pending packets. Called from tasklet, locks master device
1909 * TX lock so that no new packets can come in.
1911 void ieee80211_tx_pending(unsigned long data)
1913 struct ieee80211_local *local = (struct ieee80211_local *)data;
1914 struct net_device *dev = local->mdev;
1915 unsigned long flags;
1916 int i;
1917 bool next;
1919 rcu_read_lock();
1920 netif_tx_lock_bh(dev);
1922 for (i = 0; i < local->hw.queues; i++) {
1924 * If queue is stopped by something other than due to pending
1925 * frames, or we have no pending frames, proceed to next queue.
1927 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1928 next = false;
1929 if (local->queue_stop_reasons[i] !=
1930 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING) ||
1931 skb_queue_empty(&local->pending[i]))
1932 next = true;
1933 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1935 if (next)
1936 continue;
1939 * start the queue now to allow processing our packets,
1940 * we're under the tx lock here anyway so nothing will
1941 * happen as a result of this
1943 netif_start_subqueue(local->mdev, i);
1945 while (!skb_queue_empty(&local->pending[i])) {
1946 struct sk_buff *skb = skb_dequeue(&local->pending[i]);
1948 if (!ieee80211_tx_pending_skb(local, skb)) {
1949 skb_queue_head(&local->pending[i], skb);
1950 break;
1954 /* Start regular packet processing again. */
1955 if (skb_queue_empty(&local->pending[i]))
1956 ieee80211_wake_queue_by_reason(&local->hw, i,
1957 IEEE80211_QUEUE_STOP_REASON_PENDING);
1960 netif_tx_unlock_bh(dev);
1961 rcu_read_unlock();
1964 /* functions for drivers to get certain frames */
1966 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
1967 struct sk_buff *skb,
1968 struct beacon_data *beacon)
1970 u8 *pos, *tim;
1971 int aid0 = 0;
1972 int i, have_bits = 0, n1, n2;
1974 /* Generate bitmap for TIM only if there are any STAs in power save
1975 * mode. */
1976 if (atomic_read(&bss->num_sta_ps) > 0)
1977 /* in the hope that this is faster than
1978 * checking byte-for-byte */
1979 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1980 IEEE80211_MAX_AID+1);
1982 if (bss->dtim_count == 0)
1983 bss->dtim_count = beacon->dtim_period - 1;
1984 else
1985 bss->dtim_count--;
1987 tim = pos = (u8 *) skb_put(skb, 6);
1988 *pos++ = WLAN_EID_TIM;
1989 *pos++ = 4;
1990 *pos++ = bss->dtim_count;
1991 *pos++ = beacon->dtim_period;
1993 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1994 aid0 = 1;
1996 if (have_bits) {
1997 /* Find largest even number N1 so that bits numbered 1 through
1998 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1999 * (N2 + 1) x 8 through 2007 are 0. */
2000 n1 = 0;
2001 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2002 if (bss->tim[i]) {
2003 n1 = i & 0xfe;
2004 break;
2007 n2 = n1;
2008 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2009 if (bss->tim[i]) {
2010 n2 = i;
2011 break;
2015 /* Bitmap control */
2016 *pos++ = n1 | aid0;
2017 /* Part Virt Bitmap */
2018 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2020 tim[1] = n2 - n1 + 4;
2021 skb_put(skb, n2 - n1);
2022 } else {
2023 *pos++ = aid0; /* Bitmap control */
2024 *pos++ = 0; /* Part Virt Bitmap */
2028 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
2029 struct ieee80211_vif *vif)
2031 struct ieee80211_local *local = hw_to_local(hw);
2032 struct sk_buff *skb = NULL;
2033 struct ieee80211_tx_info *info;
2034 struct ieee80211_sub_if_data *sdata = NULL;
2035 struct ieee80211_if_ap *ap = NULL;
2036 struct beacon_data *beacon;
2037 struct ieee80211_supported_band *sband;
2038 enum ieee80211_band band = local->hw.conf.channel->band;
2040 sband = local->hw.wiphy->bands[band];
2042 rcu_read_lock();
2044 sdata = vif_to_sdata(vif);
2046 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2047 ap = &sdata->u.ap;
2048 beacon = rcu_dereference(ap->beacon);
2049 if (ap && beacon) {
2051 * headroom, head length,
2052 * tail length and maximum TIM length
2054 skb = dev_alloc_skb(local->tx_headroom +
2055 beacon->head_len +
2056 beacon->tail_len + 256);
2057 if (!skb)
2058 goto out;
2060 skb_reserve(skb, local->tx_headroom);
2061 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2062 beacon->head_len);
2065 * Not very nice, but we want to allow the driver to call
2066 * ieee80211_beacon_get() as a response to the set_tim()
2067 * callback. That, however, is already invoked under the
2068 * sta_lock to guarantee consistent and race-free update
2069 * of the tim bitmap in mac80211 and the driver.
2071 if (local->tim_in_locked_section) {
2072 ieee80211_beacon_add_tim(ap, skb, beacon);
2073 } else {
2074 unsigned long flags;
2076 spin_lock_irqsave(&local->sta_lock, flags);
2077 ieee80211_beacon_add_tim(ap, skb, beacon);
2078 spin_unlock_irqrestore(&local->sta_lock, flags);
2081 if (beacon->tail)
2082 memcpy(skb_put(skb, beacon->tail_len),
2083 beacon->tail, beacon->tail_len);
2084 } else
2085 goto out;
2086 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2087 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2088 struct ieee80211_hdr *hdr;
2090 if (!ifibss->probe_resp)
2091 goto out;
2093 skb = skb_copy(ifibss->probe_resp, GFP_ATOMIC);
2094 if (!skb)
2095 goto out;
2097 hdr = (struct ieee80211_hdr *) skb->data;
2098 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2099 IEEE80211_STYPE_BEACON);
2101 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2102 struct ieee80211_mgmt *mgmt;
2103 u8 *pos;
2105 /* headroom, head length, tail length and maximum TIM length */
2106 skb = dev_alloc_skb(local->tx_headroom + 400);
2107 if (!skb)
2108 goto out;
2110 skb_reserve(skb, local->hw.extra_tx_headroom);
2111 mgmt = (struct ieee80211_mgmt *)
2112 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2113 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2114 mgmt->frame_control =
2115 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2116 memset(mgmt->da, 0xff, ETH_ALEN);
2117 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2118 /* BSSID is left zeroed, wildcard value */
2119 mgmt->u.beacon.beacon_int =
2120 cpu_to_le16(local->hw.conf.beacon_int);
2121 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2123 pos = skb_put(skb, 2);
2124 *pos++ = WLAN_EID_SSID;
2125 *pos++ = 0x0;
2127 mesh_mgmt_ies_add(skb, sdata);
2128 } else {
2129 WARN_ON(1);
2130 goto out;
2133 info = IEEE80211_SKB_CB(skb);
2135 skb->do_not_encrypt = 1;
2137 info->band = band;
2139 * XXX: For now, always use the lowest rate
2141 info->control.rates[0].idx = 0;
2142 info->control.rates[0].count = 1;
2143 info->control.rates[1].idx = -1;
2144 info->control.rates[2].idx = -1;
2145 info->control.rates[3].idx = -1;
2146 info->control.rates[4].idx = -1;
2147 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
2149 info->control.vif = vif;
2151 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2152 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
2153 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2154 out:
2155 rcu_read_unlock();
2156 return skb;
2158 EXPORT_SYMBOL(ieee80211_beacon_get);
2160 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2161 const void *frame, size_t frame_len,
2162 const struct ieee80211_tx_info *frame_txctl,
2163 struct ieee80211_rts *rts)
2165 const struct ieee80211_hdr *hdr = frame;
2167 rts->frame_control =
2168 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2169 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2170 frame_txctl);
2171 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2172 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2174 EXPORT_SYMBOL(ieee80211_rts_get);
2176 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2177 const void *frame, size_t frame_len,
2178 const struct ieee80211_tx_info *frame_txctl,
2179 struct ieee80211_cts *cts)
2181 const struct ieee80211_hdr *hdr = frame;
2183 cts->frame_control =
2184 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2185 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2186 frame_len, frame_txctl);
2187 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2189 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2191 struct sk_buff *
2192 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2193 struct ieee80211_vif *vif)
2195 struct ieee80211_local *local = hw_to_local(hw);
2196 struct sk_buff *skb = NULL;
2197 struct sta_info *sta;
2198 struct ieee80211_tx_data tx;
2199 struct ieee80211_sub_if_data *sdata;
2200 struct ieee80211_if_ap *bss = NULL;
2201 struct beacon_data *beacon;
2202 struct ieee80211_tx_info *info;
2204 sdata = vif_to_sdata(vif);
2205 bss = &sdata->u.ap;
2207 if (!bss)
2208 return NULL;
2210 rcu_read_lock();
2211 beacon = rcu_dereference(bss->beacon);
2213 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2214 goto out;
2216 if (bss->dtim_count != 0)
2217 goto out; /* send buffered bc/mc only after DTIM beacon */
2219 while (1) {
2220 skb = skb_dequeue(&bss->ps_bc_buf);
2221 if (!skb)
2222 goto out;
2223 local->total_ps_buffered--;
2225 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2226 struct ieee80211_hdr *hdr =
2227 (struct ieee80211_hdr *) skb->data;
2228 /* more buffered multicast/broadcast frames ==> set
2229 * MoreData flag in IEEE 802.11 header to inform PS
2230 * STAs */
2231 hdr->frame_control |=
2232 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2235 if (!ieee80211_tx_prepare(local, &tx, skb))
2236 break;
2237 dev_kfree_skb_any(skb);
2240 info = IEEE80211_SKB_CB(skb);
2242 sta = tx.sta;
2243 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2244 tx.channel = local->hw.conf.channel;
2245 info->band = tx.channel->band;
2247 if (invoke_tx_handlers(&tx))
2248 skb = NULL;
2249 out:
2250 rcu_read_unlock();
2252 return skb;
2254 EXPORT_SYMBOL(ieee80211_get_buffered_bc);