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"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
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)
56 if (WARN_ON_ONCE(info->control.rates[0].idx < 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):
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
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
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
95 * PS Poll: BIT(15) | BIT(14) | aid
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 */
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
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)
126 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
129 switch (sband->band) {
130 case IEEE80211_BAND_2GHZ: {
132 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
133 flag = IEEE80211_RATE_MANDATORY_G;
135 flag = IEEE80211_RATE_MANDATORY_B;
140 case IEEE80211_BAND_5GHZ:
141 if (r->flags & IEEE80211_RATE_MANDATORY_A)
144 case IEEE80211_NUM_BANDS:
150 /* No matching basic rate found; use highest suitable mandatory
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);
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 */
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);
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);
191 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
194 if (unlikely(tx->local->sw_scanning) &&
195 !ieee80211_is_probe_req(hdr->frame_control))
198 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
201 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
204 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
206 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
207 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
208 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
209 ieee80211_is_data(hdr->frame_control))) {
210 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
211 printk(KERN_DEBUG "%s: dropped data frame to not "
212 "associated station %pM\n",
213 tx->dev->name, hdr->addr1);
214 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
215 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
219 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
220 tx->local->num_sta == 0 &&
221 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
223 * No associated STAs - no need to send multicast
234 /* This function is called whenever the AP is about to exceed the maximum limit
235 * of buffered frames for power saving STAs. This situation should not really
236 * happen often during normal operation, so dropping the oldest buffered packet
237 * from each queue should be OK to make some room for new frames. */
238 static void purge_old_ps_buffers(struct ieee80211_local *local)
240 int total = 0, purged = 0;
242 struct ieee80211_sub_if_data *sdata;
243 struct sta_info *sta;
246 * virtual interfaces are protected by RCU
250 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
251 struct ieee80211_if_ap *ap;
252 if (sdata->vif.type != NL80211_IFTYPE_AP)
255 skb = skb_dequeue(&ap->ps_bc_buf);
260 total += skb_queue_len(&ap->ps_bc_buf);
263 list_for_each_entry_rcu(sta, &local->sta_list, list) {
264 skb = skb_dequeue(&sta->ps_tx_buf);
269 total += skb_queue_len(&sta->ps_tx_buf);
274 local->total_ps_buffered = total;
275 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
276 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
277 wiphy_name(local->hw.wiphy), purged);
281 static ieee80211_tx_result
282 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 * broadcast/multicast frame
290 * If any of the associated stations is in power save mode,
291 * the frame is buffered to be sent after DTIM beacon frame.
292 * This is done either by the hardware or us.
295 /* powersaving STAs only in AP/VLAN mode */
299 /* no buffering for ordered frames */
300 if (ieee80211_has_order(hdr->frame_control))
303 /* no stations in PS mode */
304 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
307 /* buffered in mac80211 */
308 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
309 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
310 purge_old_ps_buffers(tx->local);
311 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
313 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
314 if (net_ratelimit()) {
315 printk(KERN_DEBUG "%s: BC TX buffer full - "
316 "dropping the oldest frame\n",
320 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
322 tx->local->total_ps_buffered++;
323 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
327 /* buffered in hardware */
328 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
333 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
336 if (!ieee80211_is_mgmt(fc))
339 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
342 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
349 static ieee80211_tx_result
350 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
352 struct sta_info *sta = tx->sta;
353 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
354 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
357 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
360 staflags = get_sta_flags(sta);
362 if (unlikely((staflags & WLAN_STA_PS) &&
363 !(staflags & WLAN_STA_PSPOLL))) {
364 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
365 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
367 sta->sta.addr, sta->sta.aid,
368 skb_queue_len(&sta->ps_tx_buf));
369 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
370 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
371 purge_old_ps_buffers(tx->local);
372 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
373 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
374 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
375 if (net_ratelimit()) {
376 printk(KERN_DEBUG "%s: STA %pM TX "
377 "buffer full - dropping oldest frame\n",
378 tx->dev->name, sta->sta.addr);
383 tx->local->total_ps_buffered++;
385 /* Queue frame to be sent after STA sends an PS Poll frame */
386 if (skb_queue_empty(&sta->ps_tx_buf))
387 sta_info_set_tim_bit(sta);
389 info->control.jiffies = jiffies;
390 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
393 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
394 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
395 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
396 "set -> send frame\n", tx->dev->name,
399 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
400 clear_sta_flags(sta, WLAN_STA_PSPOLL);
405 static ieee80211_tx_result debug_noinline
406 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
408 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
411 if (tx->flags & IEEE80211_TX_UNICAST)
412 return ieee80211_tx_h_unicast_ps_buf(tx);
414 return ieee80211_tx_h_multicast_ps_buf(tx);
417 static ieee80211_tx_result debug_noinline
418 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
420 struct ieee80211_key *key;
421 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
422 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
424 if (unlikely(tx->skb->do_not_encrypt))
426 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
428 else if (ieee80211_is_mgmt(hdr->frame_control) &&
429 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
431 else if ((key = rcu_dereference(tx->sdata->default_key)))
433 else if (tx->sdata->drop_unencrypted &&
434 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
435 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
436 (!ieee80211_is_robust_mgmt_frame(hdr) ||
437 (ieee80211_is_action(hdr->frame_control) &&
438 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
439 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
445 tx->key->tx_rx_count++;
446 /* TODO: add threshold stuff again */
448 switch (tx->key->conf.alg) {
450 if (ieee80211_is_auth(hdr->frame_control))
453 if (!ieee80211_is_data_present(hdr->frame_control))
457 if (!ieee80211_is_data_present(hdr->frame_control) &&
458 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
463 if (!ieee80211_is_mgmt(hdr->frame_control))
469 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
470 tx->skb->do_not_encrypt = 1;
475 static ieee80211_tx_result debug_noinline
476 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
479 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
480 struct ieee80211_supported_band *sband;
481 struct ieee80211_rate *rate;
483 bool inval = false, rts = false, short_preamble = false;
484 struct ieee80211_tx_rate_control txrc;
486 memset(&txrc, 0, sizeof(txrc));
488 sband = tx->local->hw.wiphy->bands[tx->channel->band];
490 len = min_t(int, tx->skb->len + FCS_LEN,
491 tx->local->fragmentation_threshold);
493 /* set up the tx rate control struct we give the RC algo */
494 txrc.hw = local_to_hw(tx->local);
496 txrc.bss_conf = &tx->sdata->vif.bss_conf;
498 txrc.reported_rate.idx = -1;
499 txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
501 /* set up RTS protection if desired */
502 if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD &&
503 len > tx->local->rts_threshold) {
504 txrc.rts = rts = true;
508 * Use short preamble if the BSS can handle it, but not for
509 * management frames unless we know the receiver can handle
510 * that -- the management frame might be to a station that
511 * just wants a probe response.
513 if (tx->sdata->vif.bss_conf.use_short_preamble &&
514 (ieee80211_is_data(hdr->frame_control) ||
515 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
516 txrc.short_preamble = short_preamble = true;
519 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
521 if (unlikely(info->control.rates[0].idx < 0))
524 if (txrc.reported_rate.idx < 0)
525 txrc.reported_rate = info->control.rates[0];
528 tx->sta->last_tx_rate = txrc.reported_rate;
530 if (unlikely(!info->control.rates[0].count))
531 info->control.rates[0].count = 1;
533 if (is_multicast_ether_addr(hdr->addr1)) {
535 * XXX: verify the rate is in the basic rateset
541 * set up the RTS/CTS rate as the fastest basic rate
542 * that is not faster than the data rate
544 * XXX: Should this check all retry rates?
546 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
549 rate = &sband->bitrates[info->control.rates[0].idx];
551 for (i = 0; i < sband->n_bitrates; i++) {
552 /* must be a basic rate */
553 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
555 /* must not be faster than the data rate */
556 if (sband->bitrates[i].bitrate > rate->bitrate)
559 if (sband->bitrates[baserate].bitrate <
560 sband->bitrates[i].bitrate)
564 info->control.rts_cts_rate_idx = baserate;
567 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
569 * make sure there's no valid rate following
570 * an invalid one, just in case drivers don't
571 * take the API seriously to stop at -1.
574 info->control.rates[i].idx = -1;
577 if (info->control.rates[i].idx < 0) {
583 * For now assume MCS is already set up correctly, this
586 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
587 WARN_ON(info->control.rates[i].idx > 76);
591 /* set up RTS protection if desired */
593 info->control.rates[i].flags |=
594 IEEE80211_TX_RC_USE_RTS_CTS;
597 if (WARN_ON_ONCE(info->control.rates[i].idx >=
598 sband->n_bitrates)) {
599 info->control.rates[i].idx = -1;
603 rate = &sband->bitrates[info->control.rates[i].idx];
605 /* set up short preamble */
606 if (short_preamble &&
607 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
608 info->control.rates[i].flags |=
609 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
611 /* set up G protection */
612 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
613 rate->flags & IEEE80211_RATE_ERP_G)
614 info->control.rates[i].flags |=
615 IEEE80211_TX_RC_USE_CTS_PROTECT;
621 static ieee80211_tx_result debug_noinline
622 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
624 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
627 info->control.sta = &tx->sta->sta;
632 static ieee80211_tx_result debug_noinline
633 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
635 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
636 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
642 * Packet injection may want to control the sequence
643 * number, if we have no matching interface then we
644 * neither assign one ourselves nor ask the driver to.
646 if (unlikely(!info->control.vif))
649 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
652 if (ieee80211_hdrlen(hdr->frame_control) < 24)
656 * Anything but QoS data that has a sequence number field
657 * (is long enough) gets a sequence number from the global
660 if (!ieee80211_is_data_qos(hdr->frame_control)) {
661 /* driver should assign sequence number */
662 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
663 /* for pure STA mode without beacons, we can do it */
664 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
665 tx->sdata->sequence_number += 0x10;
666 tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
671 * This should be true for injected/management frames only, for
672 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
673 * above since they are not QoS-data frames.
678 /* include per-STA, per-TID sequence counter */
680 qc = ieee80211_get_qos_ctl(hdr);
681 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
682 seq = &tx->sta->tid_seq[tid];
684 hdr->seq_ctrl = cpu_to_le16(*seq);
686 /* Increase the sequence number. */
687 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
692 static ieee80211_tx_result debug_noinline
693 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
695 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
696 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
697 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
698 struct sk_buff **frags, *first, *frag;
702 int frag_threshold = tx->local->fragmentation_threshold;
704 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
708 * Warn when submitting a fragmented A-MPDU frame and drop it.
709 * This scenario is handled in __ieee80211_tx_prepare but extra
710 * caution taken here as fragmented ampdu may cause Tx stop.
712 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
717 hdrlen = ieee80211_hdrlen(hdr->frame_control);
718 payload_len = first->len - hdrlen;
719 per_fragm = frag_threshold - hdrlen - FCS_LEN;
720 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
722 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
726 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
727 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
728 pos = first->data + hdrlen + per_fragm;
729 left = payload_len - per_fragm;
730 for (i = 0; i < num_fragm - 1; i++) {
731 struct ieee80211_hdr *fhdr;
737 /* reserve enough extra head and tail room for possible
740 dev_alloc_skb(tx->local->tx_headroom +
742 IEEE80211_ENCRYPT_HEADROOM +
743 IEEE80211_ENCRYPT_TAILROOM);
747 /* Make sure that all fragments use the same priority so
748 * that they end up using the same TX queue */
749 frag->priority = first->priority;
751 skb_reserve(frag, tx->local->tx_headroom +
752 IEEE80211_ENCRYPT_HEADROOM);
754 /* copy TX information */
755 info = IEEE80211_SKB_CB(frag);
756 memcpy(info, first->cb, sizeof(frag->cb));
758 /* copy/fill in 802.11 header */
759 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
760 memcpy(fhdr, first->data, hdrlen);
761 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
763 if (i == num_fragm - 2) {
764 /* clear MOREFRAGS bit for the last fragment */
765 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
768 * No multi-rate retries for fragmented frames, that
769 * would completely throw off the NAV at other STAs.
771 info->control.rates[1].idx = -1;
772 info->control.rates[2].idx = -1;
773 info->control.rates[3].idx = -1;
774 info->control.rates[4].idx = -1;
775 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
776 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
780 copylen = left > per_fragm ? per_fragm : left;
781 memcpy(skb_put(frag, copylen), pos, copylen);
783 skb_copy_queue_mapping(frag, first);
785 frag->do_not_encrypt = first->do_not_encrypt;
790 skb_trim(first, hdrlen + per_fragm);
792 tx->num_extra_frag = num_fragm - 1;
793 tx->extra_frag = frags;
799 for (i = 0; i < num_fragm - 1; i++)
801 dev_kfree_skb(frags[i]);
804 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
808 static ieee80211_tx_result debug_noinline
809 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
814 switch (tx->key->conf.alg) {
816 return ieee80211_crypto_wep_encrypt(tx);
818 return ieee80211_crypto_tkip_encrypt(tx);
820 return ieee80211_crypto_ccmp_encrypt(tx);
822 return ieee80211_crypto_aes_cmac_encrypt(tx);
830 static ieee80211_tx_result debug_noinline
831 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
835 int group_addr = is_multicast_ether_addr(hdr->addr1);
837 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
838 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
842 hdr->duration_id = ieee80211_duration(tx, group_addr,
843 tx->extra_frag[0]->len);
845 for (i = 0; i < tx->num_extra_frag; i++) {
846 if (i + 1 < tx->num_extra_frag)
847 next_len = tx->extra_frag[i + 1]->len;
851 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
852 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
858 static ieee80211_tx_result debug_noinline
859 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
866 tx->sta->tx_packets++;
867 tx->sta->tx_fragments++;
868 tx->sta->tx_bytes += tx->skb->len;
869 if (tx->extra_frag) {
870 tx->sta->tx_fragments += tx->num_extra_frag;
871 for (i = 0; i < tx->num_extra_frag; i++)
872 tx->sta->tx_bytes += tx->extra_frag[i]->len;
879 /* actual transmit path */
882 * deal with packet injection down monitor interface
883 * with Radiotap Header -- only called for monitor mode interface
885 static ieee80211_tx_result
886 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
890 * this is the moment to interpret and discard the radiotap header that
891 * must be at the start of the packet injected in Monitor mode
893 * Need to take some care with endian-ness since radiotap
894 * args are little-endian
897 struct ieee80211_radiotap_iterator iterator;
898 struct ieee80211_radiotap_header *rthdr =
899 (struct ieee80211_radiotap_header *) skb->data;
900 struct ieee80211_supported_band *sband;
901 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
903 sband = tx->local->hw.wiphy->bands[tx->channel->band];
905 skb->do_not_encrypt = 1;
906 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
909 * for every radiotap entry that is present
910 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
911 * entries present, or -EINVAL on error)
915 ret = ieee80211_radiotap_iterator_next(&iterator);
920 /* see if this argument is something we can use */
921 switch (iterator.this_arg_index) {
923 * You must take care when dereferencing iterator.this_arg
924 * for multibyte types... the pointer is not aligned. Use
925 * get_unaligned((type *)iterator.this_arg) to dereference
926 * iterator.this_arg for type "type" safely on all arches.
928 case IEEE80211_RADIOTAP_FLAGS:
929 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
931 * this indicates that the skb we have been
932 * handed has the 32-bit FCS CRC at the end...
933 * we should react to that by snipping it off
934 * because it will be recomputed and added
937 if (skb->len < (iterator.max_length + FCS_LEN))
940 skb_trim(skb, skb->len - FCS_LEN);
942 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
943 tx->skb->do_not_encrypt = 0;
944 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
945 tx->flags |= IEEE80211_TX_FRAGMENTED;
949 * Please update the file
950 * Documentation/networking/mac80211-injection.txt
951 * when parsing new fields here.
959 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
963 * remove the radiotap header
964 * iterator->max_length was sanity-checked against
965 * skb->len by iterator init
967 skb_pull(skb, iterator.max_length);
975 static ieee80211_tx_result
976 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
978 struct net_device *dev)
980 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
981 struct ieee80211_hdr *hdr;
982 struct ieee80211_sub_if_data *sdata;
983 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
988 memset(tx, 0, sizeof(*tx));
990 tx->dev = dev; /* use original interface */
992 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
993 tx->channel = local->hw.conf.channel;
995 * Set this flag (used below to indicate "automatic fragmentation"),
996 * it will be cleared/left by radiotap as desired.
998 tx->flags |= IEEE80211_TX_FRAGMENTED;
1000 /* process and remove the injection radiotap header */
1001 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1002 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
1003 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
1007 * __ieee80211_parse_tx_radiotap has now removed
1008 * the radiotap header that was present and pre-filled
1009 * 'tx' with tx control information.
1013 hdr = (struct ieee80211_hdr *) skb->data;
1015 tx->sta = sta_info_get(local, hdr->addr1);
1017 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1018 qc = ieee80211_get_qos_ctl(hdr);
1019 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1021 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1022 if (*state == HT_AGG_STATE_OPERATIONAL)
1023 info->flags |= IEEE80211_TX_CTL_AMPDU;
1026 if (is_multicast_ether_addr(hdr->addr1)) {
1027 tx->flags &= ~IEEE80211_TX_UNICAST;
1028 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1030 tx->flags |= IEEE80211_TX_UNICAST;
1031 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1034 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1035 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1036 skb->len + FCS_LEN > local->fragmentation_threshold &&
1037 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1038 tx->flags |= IEEE80211_TX_FRAGMENTED;
1040 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1044 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1045 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1046 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1048 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1049 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1050 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1051 tx->ethertype = (pos[0] << 8) | pos[1];
1053 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1059 * NB: @tx is uninitialised when passed in here
1061 static int ieee80211_tx_prepare(struct ieee80211_local *local,
1062 struct ieee80211_tx_data *tx,
1063 struct sk_buff *skb)
1065 struct net_device *dev;
1067 dev = dev_get_by_index(&init_net, skb->iif);
1068 if (unlikely(dev && !is_ieee80211_device(local, dev))) {
1074 /* initialises tx with control */
1075 __ieee80211_tx_prepare(tx, skb, dev);
1080 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1081 struct ieee80211_tx_data *tx)
1083 struct ieee80211_tx_info *info;
1087 if (netif_subqueue_stopped(local->mdev, skb))
1088 return IEEE80211_TX_AGAIN;
1090 ret = local->ops->tx(local_to_hw(local), skb);
1092 return IEEE80211_TX_AGAIN;
1093 local->mdev->trans_start = jiffies;
1094 ieee80211_led_tx(local, 1);
1096 if (tx->extra_frag) {
1097 for (i = 0; i < tx->num_extra_frag; i++) {
1098 if (!tx->extra_frag[i])
1100 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1101 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1102 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1103 if (netif_subqueue_stopped(local->mdev,
1105 return IEEE80211_TX_FRAG_AGAIN;
1107 ret = local->ops->tx(local_to_hw(local),
1110 return IEEE80211_TX_FRAG_AGAIN;
1111 local->mdev->trans_start = jiffies;
1112 ieee80211_led_tx(local, 1);
1113 tx->extra_frag[i] = NULL;
1115 kfree(tx->extra_frag);
1116 tx->extra_frag = NULL;
1118 return IEEE80211_TX_OK;
1122 * Invoke TX handlers, return 0 on success and non-zero if the
1123 * frame was dropped or queued.
1125 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1127 struct sk_buff *skb = tx->skb;
1128 ieee80211_tx_result res = TX_DROP;
1131 #define CALL_TXH(txh) \
1133 if (res != TX_CONTINUE) \
1136 CALL_TXH(ieee80211_tx_h_check_assoc)
1137 CALL_TXH(ieee80211_tx_h_ps_buf)
1138 CALL_TXH(ieee80211_tx_h_select_key)
1139 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1140 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1141 CALL_TXH(ieee80211_tx_h_misc)
1142 CALL_TXH(ieee80211_tx_h_sequence)
1143 CALL_TXH(ieee80211_tx_h_fragment)
1144 /* handlers after fragment must be aware of tx info fragmentation! */
1145 CALL_TXH(ieee80211_tx_h_encrypt)
1146 CALL_TXH(ieee80211_tx_h_calculate_duration)
1147 CALL_TXH(ieee80211_tx_h_stats)
1151 if (unlikely(res == TX_DROP)) {
1152 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1154 for (i = 0; i < tx->num_extra_frag; i++)
1155 if (tx->extra_frag[i])
1156 dev_kfree_skb(tx->extra_frag[i]);
1157 kfree(tx->extra_frag);
1159 } else if (unlikely(res == TX_QUEUED)) {
1160 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1167 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1169 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1170 struct sta_info *sta;
1171 struct ieee80211_tx_data tx;
1172 ieee80211_tx_result res_prepare;
1173 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1177 queue = skb_get_queue_mapping(skb);
1179 WARN_ON(test_bit(queue, local->queues_pending));
1181 if (unlikely(skb->len < 10)) {
1188 /* initialises tx */
1189 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1191 if (res_prepare == TX_DROP) {
1198 tx.channel = local->hw.conf.channel;
1199 info->band = tx.channel->band;
1201 if (invoke_tx_handlers(&tx))
1205 ret = __ieee80211_tx(local, skb, &tx);
1207 struct ieee80211_tx_stored_packet *store;
1210 * Since there are no fragmented frames on A-MPDU
1211 * queues, there's no reason for a driver to reject
1212 * a frame there, warn and drop it.
1214 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1217 store = &local->pending_packet[queue];
1219 if (ret == IEEE80211_TX_FRAG_AGAIN)
1222 set_bit(queue, local->queues_pending);
1225 * When the driver gets out of buffers during sending of
1226 * fragments and calls ieee80211_stop_queue, the netif
1227 * subqueue is stopped. There is, however, a small window
1228 * in which the PENDING bit is not yet set. If a buffer
1229 * gets available in that window (i.e. driver calls
1230 * ieee80211_wake_queue), we would end up with ieee80211_tx
1231 * called with the PENDING bit still set. Prevent this by
1232 * continuing transmitting here when that situation is
1233 * possible to have happened.
1235 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1236 clear_bit(queue, local->queues_pending);
1240 store->extra_frag = tx.extra_frag;
1241 store->num_extra_frag = tx.num_extra_frag;
1250 for (i = 0; i < tx.num_extra_frag; i++)
1251 if (tx.extra_frag[i])
1252 dev_kfree_skb(tx.extra_frag[i]);
1253 kfree(tx.extra_frag);
1258 /* device xmit handlers */
1260 static int ieee80211_skb_resize(struct ieee80211_local *local,
1261 struct sk_buff *skb,
1262 int head_need, bool may_encrypt)
1267 * This could be optimised, devices that do full hardware
1268 * crypto (including TKIP MMIC) need no tailroom... But we
1269 * have no drivers for such devices currently.
1272 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1273 tail_need -= skb_tailroom(skb);
1274 tail_need = max_t(int, tail_need, 0);
1277 if (head_need || tail_need) {
1278 /* Sorry. Can't account for this any more */
1282 if (skb_header_cloned(skb))
1283 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1285 I802_DEBUG_INC(local->tx_expand_skb_head);
1287 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1288 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1289 wiphy_name(local->hw.wiphy));
1293 /* update truesize too */
1294 skb->truesize += head_need + tail_need;
1299 int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
1301 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
1302 struct ieee80211_local *local = mpriv->local;
1303 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1304 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1305 struct net_device *odev = NULL;
1306 struct ieee80211_sub_if_data *osdata;
1313 } monitor_iface = NOT_MONITOR;
1317 odev = dev_get_by_index(&init_net, skb->iif);
1318 if (unlikely(odev && !is_ieee80211_device(local, odev))) {
1322 if (unlikely(!odev)) {
1323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1324 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1325 "originating device\n", dev->name);
1331 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1332 local->hw.conf.dynamic_ps_timeout > 0) {
1333 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1334 ieee80211_stop_queues_by_reason(&local->hw,
1335 IEEE80211_QUEUE_STOP_REASON_PS);
1336 queue_work(local->hw.workqueue,
1337 &local->dynamic_ps_disable_work);
1340 mod_timer(&local->dynamic_ps_timer, jiffies +
1341 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1344 memset(info, 0, sizeof(*info));
1346 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1348 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1350 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1351 ieee80211_is_data(hdr->frame_control)) {
1352 if (is_multicast_ether_addr(hdr->addr3))
1353 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1355 if (mesh_nexthop_lookup(skb, osdata)) {
1359 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1360 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1362 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1363 struct ieee80211_sub_if_data *sdata;
1367 info->flags |= IEEE80211_TX_CTL_INJECTED;
1368 monitor_iface = UNKNOWN_ADDRESS;
1370 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1371 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1372 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1374 /* check the header is complete in the frame */
1375 if (likely(skb->len >= len_rthdr + hdrlen)) {
1377 * We process outgoing injected frames that have a
1378 * local address we handle as though they are our
1380 * This code here isn't entirely correct, the local
1381 * MAC address is not necessarily enough to find
1382 * the interface to use; for that proper VLAN/WDS
1383 * support we will need a different mechanism.
1387 list_for_each_entry_rcu(sdata, &local->interfaces,
1389 if (!netif_running(sdata->dev))
1391 if (compare_ether_addr(sdata->dev->dev_addr,
1393 dev_hold(sdata->dev);
1397 skb->iif = sdata->dev->ifindex;
1398 monitor_iface = FOUND_SDATA;
1406 may_encrypt = !skb->do_not_encrypt;
1408 headroom = osdata->local->tx_headroom;
1410 headroom += IEEE80211_ENCRYPT_HEADROOM;
1411 headroom -= skb_headroom(skb);
1412 headroom = max_t(int, 0, headroom);
1414 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1420 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1421 osdata = container_of(osdata->bss,
1422 struct ieee80211_sub_if_data,
1424 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1425 info->control.vif = &osdata->vif;
1426 ret = ieee80211_tx(odev, skb);
1432 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1433 struct net_device *dev)
1435 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1436 struct ieee80211_radiotap_header *prthdr =
1437 (struct ieee80211_radiotap_header *)skb->data;
1440 /* check for not even having the fixed radiotap header part */
1441 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1442 goto fail; /* too short to be possibly valid */
1444 /* is it a header version we can trust to find length from? */
1445 if (unlikely(prthdr->it_version))
1446 goto fail; /* only version 0 is supported */
1448 /* then there must be a radiotap header with a length we can use */
1449 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1451 /* does the skb contain enough to deliver on the alleged length? */
1452 if (unlikely(skb->len < len_rthdr))
1453 goto fail; /* skb too short for claimed rt header extent */
1455 skb->dev = local->mdev;
1457 /* needed because we set skb device to master */
1458 skb->iif = dev->ifindex;
1460 /* sometimes we do encrypt injected frames, will be fixed
1461 * up in radiotap parser if not wanted */
1462 skb->do_not_encrypt = 0;
1465 * fix up the pointers accounting for the radiotap
1466 * header still being in there. We are being given
1467 * a precooked IEEE80211 header so no need for
1470 skb_set_mac_header(skb, len_rthdr);
1472 * these are just fixed to the end of the rt area since we
1473 * don't have any better information and at this point, nobody cares
1475 skb_set_network_header(skb, len_rthdr);
1476 skb_set_transport_header(skb, len_rthdr);
1478 /* pass the radiotap header up to the next stage intact */
1479 dev_queue_xmit(skb);
1480 return NETDEV_TX_OK;
1484 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1488 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1489 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1490 * @skb: packet to be sent
1491 * @dev: incoming interface
1493 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1494 * not be freed, and caller is responsible for either retrying later or freeing
1497 * This function takes in an Ethernet header and encapsulates it with suitable
1498 * IEEE 802.11 header based on which interface the packet is coming in. The
1499 * encapsulated packet will then be passed to master interface, wlan#.11, for
1500 * transmission (through low-level driver).
1502 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1503 struct net_device *dev)
1505 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1506 struct ieee80211_local *local = sdata->local;
1507 int ret = 1, head_need;
1508 u16 ethertype, hdrlen, meshhdrlen = 0;
1510 struct ieee80211_hdr hdr;
1511 struct ieee80211s_hdr mesh_hdr;
1512 const u8 *encaps_data;
1513 int encaps_len, skip_header_bytes;
1515 struct sta_info *sta;
1518 if (unlikely(skb->len < ETH_HLEN)) {
1523 nh_pos = skb_network_header(skb) - skb->data;
1524 h_pos = skb_transport_header(skb) - skb->data;
1526 /* convert Ethernet header to proper 802.11 header (based on
1527 * operation mode) */
1528 ethertype = (skb->data[12] << 8) | skb->data[13];
1529 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1531 switch (sdata->vif.type) {
1532 case NL80211_IFTYPE_AP:
1533 case NL80211_IFTYPE_AP_VLAN:
1534 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1536 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1537 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1538 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1541 case NL80211_IFTYPE_WDS:
1542 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1544 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1545 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1546 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1547 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1550 #ifdef CONFIG_MAC80211_MESH
1551 case NL80211_IFTYPE_MESH_POINT:
1552 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1553 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1554 /* Do not send frames with mesh_ttl == 0 */
1555 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1559 memset(&mesh_hdr, 0, sizeof(mesh_hdr));
1561 if (compare_ether_addr(dev->dev_addr,
1562 skb->data + ETH_ALEN) == 0) {
1564 memset(hdr.addr1, 0, ETH_ALEN);
1565 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1566 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1567 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1568 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1570 /* packet from other interface */
1571 struct mesh_path *mppath;
1573 memset(hdr.addr1, 0, ETH_ALEN);
1574 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1575 memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN);
1577 if (is_multicast_ether_addr(skb->data))
1578 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1581 mppath = mpp_path_lookup(skb->data, sdata);
1583 memcpy(hdr.addr3, mppath->mpp, ETH_ALEN);
1585 memset(hdr.addr3, 0xff, ETH_ALEN);
1589 mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6;
1590 mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
1591 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum);
1592 memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN);
1593 memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN);
1594 sdata->u.mesh.mesh_seqnum++;
1600 case NL80211_IFTYPE_STATION:
1601 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1603 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1604 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1605 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1608 case NL80211_IFTYPE_ADHOC:
1610 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1611 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1612 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1621 * There's no need to try to look up the destination
1622 * if it is a multicast address (which can only happen
1625 if (!is_multicast_ether_addr(hdr.addr1)) {
1627 sta = sta_info_get(local, hdr.addr1);
1629 sta_flags = get_sta_flags(sta);
1633 /* receiver and we are QoS enabled, use a QoS type frame */
1634 if (sta_flags & WLAN_STA_WME &&
1635 ieee80211_num_regular_queues(&local->hw) >= 4) {
1636 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1641 * Drop unicast frames to unauthorised stations unless they are
1642 * EAPOL frames from the local station.
1644 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1645 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1646 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1647 !(ethertype == ETH_P_PAE &&
1648 compare_ether_addr(dev->dev_addr,
1649 skb->data + ETH_ALEN) == 0))) {
1650 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1651 if (net_ratelimit())
1652 printk(KERN_DEBUG "%s: dropped frame to %pM"
1653 " (unauthorized port)\n", dev->name,
1657 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1663 hdr.frame_control = fc;
1664 hdr.duration_id = 0;
1667 skip_header_bytes = ETH_HLEN;
1668 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1669 encaps_data = bridge_tunnel_header;
1670 encaps_len = sizeof(bridge_tunnel_header);
1671 skip_header_bytes -= 2;
1672 } else if (ethertype >= 0x600) {
1673 encaps_data = rfc1042_header;
1674 encaps_len = sizeof(rfc1042_header);
1675 skip_header_bytes -= 2;
1681 skb_pull(skb, skip_header_bytes);
1682 nh_pos -= skip_header_bytes;
1683 h_pos -= skip_header_bytes;
1685 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1688 * So we need to modify the skb header and hence need a copy of
1689 * that. The head_need variable above doesn't, so far, include
1690 * the needed header space that we don't need right away. If we
1691 * can, then we don't reallocate right now but only after the
1692 * frame arrives at the master device (if it does...)
1694 * If we cannot, however, then we will reallocate to include all
1695 * the ever needed space. Also, if we need to reallocate it anyway,
1696 * make it big enough for everything we may ever need.
1699 if (head_need > 0 || skb_cloned(skb)) {
1700 head_need += IEEE80211_ENCRYPT_HEADROOM;
1701 head_need += local->tx_headroom;
1702 head_need = max_t(int, 0, head_need);
1703 if (ieee80211_skb_resize(local, skb, head_need, true))
1708 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1709 nh_pos += encaps_len;
1710 h_pos += encaps_len;
1713 if (meshhdrlen > 0) {
1714 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1715 nh_pos += meshhdrlen;
1716 h_pos += meshhdrlen;
1719 if (ieee80211_is_data_qos(fc)) {
1720 __le16 *qos_control;
1722 qos_control = (__le16*) skb_push(skb, 2);
1723 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1725 * Maybe we could actually set some fields here, for now just
1726 * initialise to zero to indicate no special operation.
1730 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1735 skb->iif = dev->ifindex;
1737 skb->dev = local->mdev;
1738 dev->stats.tx_packets++;
1739 dev->stats.tx_bytes += skb->len;
1741 /* Update skb pointers to various headers since this modified frame
1742 * is going to go through Linux networking code that may potentially
1743 * need things like pointer to IP header. */
1744 skb_set_mac_header(skb, 0);
1745 skb_set_network_header(skb, nh_pos);
1746 skb_set_transport_header(skb, h_pos);
1748 dev->trans_start = jiffies;
1749 dev_queue_xmit(skb);
1762 * ieee80211_clear_tx_pending may not be called in a context where
1763 * it is possible that it packets could come in again.
1765 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1768 struct ieee80211_tx_stored_packet *store;
1770 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1771 if (!test_bit(i, local->queues_pending))
1773 store = &local->pending_packet[i];
1774 kfree_skb(store->skb);
1775 for (j = 0; j < store->num_extra_frag; j++)
1776 kfree_skb(store->extra_frag[j]);
1777 kfree(store->extra_frag);
1778 clear_bit(i, local->queues_pending);
1783 * Transmit all pending packets. Called from tasklet, locks master device
1784 * TX lock so that no new packets can come in.
1786 void ieee80211_tx_pending(unsigned long data)
1788 struct ieee80211_local *local = (struct ieee80211_local *)data;
1789 struct net_device *dev = local->mdev;
1790 struct ieee80211_tx_stored_packet *store;
1791 struct ieee80211_tx_data tx;
1794 netif_tx_lock_bh(dev);
1795 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1796 /* Check that this queue is ok */
1797 if (__netif_subqueue_stopped(local->mdev, i) &&
1798 !test_bit(i, local->queues_pending_run))
1801 if (!test_bit(i, local->queues_pending)) {
1802 clear_bit(i, local->queues_pending_run);
1803 ieee80211_wake_queue(&local->hw, i);
1807 clear_bit(i, local->queues_pending_run);
1808 netif_start_subqueue(local->mdev, i);
1810 store = &local->pending_packet[i];
1811 tx.extra_frag = store->extra_frag;
1812 tx.num_extra_frag = store->num_extra_frag;
1814 ret = __ieee80211_tx(local, store->skb, &tx);
1816 if (ret == IEEE80211_TX_FRAG_AGAIN)
1819 clear_bit(i, local->queues_pending);
1820 ieee80211_wake_queue(&local->hw, i);
1823 netif_tx_unlock_bh(dev);
1826 /* functions for drivers to get certain frames */
1828 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
1829 struct sk_buff *skb,
1830 struct beacon_data *beacon)
1834 int i, have_bits = 0, n1, n2;
1836 /* Generate bitmap for TIM only if there are any STAs in power save
1838 if (atomic_read(&bss->num_sta_ps) > 0)
1839 /* in the hope that this is faster than
1840 * checking byte-for-byte */
1841 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1842 IEEE80211_MAX_AID+1);
1844 if (bss->dtim_count == 0)
1845 bss->dtim_count = beacon->dtim_period - 1;
1849 tim = pos = (u8 *) skb_put(skb, 6);
1850 *pos++ = WLAN_EID_TIM;
1852 *pos++ = bss->dtim_count;
1853 *pos++ = beacon->dtim_period;
1855 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1859 /* Find largest even number N1 so that bits numbered 1 through
1860 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1861 * (N2 + 1) x 8 through 2007 are 0. */
1863 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1870 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1877 /* Bitmap control */
1879 /* Part Virt Bitmap */
1880 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1882 tim[1] = n2 - n1 + 4;
1883 skb_put(skb, n2 - n1);
1885 *pos++ = aid0; /* Bitmap control */
1886 *pos++ = 0; /* Part Virt Bitmap */
1890 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1891 struct ieee80211_vif *vif)
1893 struct ieee80211_local *local = hw_to_local(hw);
1894 struct sk_buff *skb = NULL;
1895 struct ieee80211_tx_info *info;
1896 struct ieee80211_sub_if_data *sdata = NULL;
1897 struct ieee80211_if_ap *ap = NULL;
1898 struct ieee80211_if_sta *ifsta = NULL;
1899 struct beacon_data *beacon;
1900 struct ieee80211_supported_band *sband;
1901 enum ieee80211_band band = local->hw.conf.channel->band;
1903 sband = local->hw.wiphy->bands[band];
1907 sdata = vif_to_sdata(vif);
1909 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1911 beacon = rcu_dereference(ap->beacon);
1914 * headroom, head length,
1915 * tail length and maximum TIM length
1917 skb = dev_alloc_skb(local->tx_headroom +
1919 beacon->tail_len + 256);
1923 skb_reserve(skb, local->tx_headroom);
1924 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1928 * Not very nice, but we want to allow the driver to call
1929 * ieee80211_beacon_get() as a response to the set_tim()
1930 * callback. That, however, is already invoked under the
1931 * sta_lock to guarantee consistent and race-free update
1932 * of the tim bitmap in mac80211 and the driver.
1934 if (local->tim_in_locked_section) {
1935 ieee80211_beacon_add_tim(ap, skb, beacon);
1937 unsigned long flags;
1939 spin_lock_irqsave(&local->sta_lock, flags);
1940 ieee80211_beacon_add_tim(ap, skb, beacon);
1941 spin_unlock_irqrestore(&local->sta_lock, flags);
1945 memcpy(skb_put(skb, beacon->tail_len),
1946 beacon->tail, beacon->tail_len);
1949 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1950 struct ieee80211_hdr *hdr;
1951 ifsta = &sdata->u.sta;
1953 if (!ifsta->probe_resp)
1956 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1960 hdr = (struct ieee80211_hdr *) skb->data;
1961 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1962 IEEE80211_STYPE_BEACON);
1964 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1965 struct ieee80211_mgmt *mgmt;
1968 /* headroom, head length, tail length and maximum TIM length */
1969 skb = dev_alloc_skb(local->tx_headroom + 400);
1973 skb_reserve(skb, local->hw.extra_tx_headroom);
1974 mgmt = (struct ieee80211_mgmt *)
1975 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1976 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1977 mgmt->frame_control =
1978 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1979 memset(mgmt->da, 0xff, ETH_ALEN);
1980 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1981 /* BSSID is left zeroed, wildcard value */
1982 mgmt->u.beacon.beacon_int =
1983 cpu_to_le16(local->hw.conf.beacon_int);
1984 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1986 pos = skb_put(skb, 2);
1987 *pos++ = WLAN_EID_SSID;
1990 mesh_mgmt_ies_add(skb, sdata);
1996 info = IEEE80211_SKB_CB(skb);
1998 skb->do_not_encrypt = 1;
2002 * XXX: For now, always use the lowest rate
2004 info->control.rates[0].idx = 0;
2005 info->control.rates[0].count = 1;
2006 info->control.rates[1].idx = -1;
2007 info->control.rates[2].idx = -1;
2008 info->control.rates[3].idx = -1;
2009 info->control.rates[4].idx = -1;
2010 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
2012 info->control.vif = vif;
2014 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2015 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
2016 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2021 EXPORT_SYMBOL(ieee80211_beacon_get);
2023 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2024 const void *frame, size_t frame_len,
2025 const struct ieee80211_tx_info *frame_txctl,
2026 struct ieee80211_rts *rts)
2028 const struct ieee80211_hdr *hdr = frame;
2030 rts->frame_control =
2031 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2032 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2034 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2035 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2037 EXPORT_SYMBOL(ieee80211_rts_get);
2039 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2040 const void *frame, size_t frame_len,
2041 const struct ieee80211_tx_info *frame_txctl,
2042 struct ieee80211_cts *cts)
2044 const struct ieee80211_hdr *hdr = frame;
2046 cts->frame_control =
2047 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2048 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2049 frame_len, frame_txctl);
2050 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2052 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2055 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2056 struct ieee80211_vif *vif)
2058 struct ieee80211_local *local = hw_to_local(hw);
2059 struct sk_buff *skb = NULL;
2060 struct sta_info *sta;
2061 struct ieee80211_tx_data tx;
2062 struct ieee80211_sub_if_data *sdata;
2063 struct ieee80211_if_ap *bss = NULL;
2064 struct beacon_data *beacon;
2065 struct ieee80211_tx_info *info;
2067 sdata = vif_to_sdata(vif);
2074 beacon = rcu_dereference(bss->beacon);
2076 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2079 if (bss->dtim_count != 0)
2080 goto out; /* send buffered bc/mc only after DTIM beacon */
2083 skb = skb_dequeue(&bss->ps_bc_buf);
2086 local->total_ps_buffered--;
2088 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2089 struct ieee80211_hdr *hdr =
2090 (struct ieee80211_hdr *) skb->data;
2091 /* more buffered multicast/broadcast frames ==> set
2092 * MoreData flag in IEEE 802.11 header to inform PS
2094 hdr->frame_control |=
2095 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2098 if (!ieee80211_tx_prepare(local, &tx, skb))
2100 dev_kfree_skb_any(skb);
2103 info = IEEE80211_SKB_CB(skb);
2106 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2107 tx.channel = local->hw.conf.channel;
2108 info->band = tx.channel->band;
2110 if (invoke_tx_handlers(&tx))
2117 EXPORT_SYMBOL(ieee80211_get_buffered_bc);