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 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
42 static void ieee80211_dump_frame(const char *ifname, const char *title,
43 const struct sk_buff *skb)
45 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
49 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
55 hdrlen = ieee80211_hdrlen(hdr->frame_control);
56 if (hdrlen > skb->len)
59 printk(" FC=0x%04x DUR=0x%04x",
60 le16_to_cpu(hdr->frame_control), le16_to_cpu(hdr->duration_id));
62 printk(" A1=%s", print_mac(mac, hdr->addr1));
64 printk(" A2=%s", print_mac(mac, hdr->addr2));
66 printk(" A3=%s", print_mac(mac, hdr->addr3));
68 printk(" A4=%s", print_mac(mac, hdr->addr4));
71 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
72 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
76 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
78 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
81 int rate, mrate, erp, dur, i;
82 struct ieee80211_rate *txrate;
83 struct ieee80211_local *local = tx->local;
84 struct ieee80211_supported_band *sband;
85 struct ieee80211_hdr *hdr;
87 sband = local->hw.wiphy->bands[tx->channel->band];
88 txrate = &sband->bitrates[tx->rate_idx];
91 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
92 erp = txrate->flags & IEEE80211_RATE_ERP_G;
95 * data and mgmt (except PS Poll):
97 * - during contention period:
98 * if addr1 is group address: 0
99 * if more fragments = 0 and addr1 is individual address: time to
100 * transmit one ACK plus SIFS
101 * if more fragments = 1 and addr1 is individual address: time to
102 * transmit next fragment plus 2 x ACK plus 3 x SIFS
105 * - control response frame (CTS or ACK) shall be transmitted using the
106 * same rate as the immediately previous frame in the frame exchange
107 * sequence, if this rate belongs to the PHY mandatory rates, or else
108 * at the highest possible rate belonging to the PHY rates in the
111 hdr = (struct ieee80211_hdr *)tx->skb->data;
112 if (ieee80211_is_ctl(hdr->frame_control)) {
113 /* TODO: These control frames are not currently sent by
114 * mac80211, but should they be implemented, this function
115 * needs to be updated to support duration field calculation.
117 * RTS: time needed to transmit pending data/mgmt frame plus
118 * one CTS frame plus one ACK frame plus 3 x SIFS
119 * CTS: duration of immediately previous RTS minus time
120 * required to transmit CTS and its SIFS
121 * ACK: 0 if immediately previous directed data/mgmt had
122 * more=0, with more=1 duration in ACK frame is duration
123 * from previous frame minus time needed to transmit ACK
125 * PS Poll: BIT(15) | BIT(14) | aid
131 if (0 /* FIX: data/mgmt during CFP */)
132 return cpu_to_le16(32768);
134 if (group_addr) /* Group address as the destination - no ACK */
137 /* Individual destination address:
138 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
139 * CTS and ACK frames shall be transmitted using the highest rate in
140 * basic rate set that is less than or equal to the rate of the
141 * immediately previous frame and that is using the same modulation
142 * (CCK or OFDM). If no basic rate set matches with these requirements,
143 * the highest mandatory rate of the PHY that is less than or equal to
144 * the rate of the previous frame is used.
145 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
148 /* use lowest available if everything fails */
149 mrate = sband->bitrates[0].bitrate;
150 for (i = 0; i < sband->n_bitrates; i++) {
151 struct ieee80211_rate *r = &sband->bitrates[i];
153 if (r->bitrate > txrate->bitrate)
156 if (tx->sdata->bss_conf.basic_rates & BIT(i))
159 switch (sband->band) {
160 case IEEE80211_BAND_2GHZ: {
162 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
163 flag = IEEE80211_RATE_MANDATORY_G;
165 flag = IEEE80211_RATE_MANDATORY_B;
170 case IEEE80211_BAND_5GHZ:
171 if (r->flags & IEEE80211_RATE_MANDATORY_A)
174 case IEEE80211_NUM_BANDS:
180 /* No matching basic rate found; use highest suitable mandatory
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
189 dur = ieee80211_frame_duration(local, 10, rate, erp,
190 tx->sdata->bss_conf.use_short_preamble);
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
197 dur += ieee80211_frame_duration(local, next_frag_len,
198 txrate->bitrate, erp,
199 tx->sdata->bss_conf.use_short_preamble);
202 return cpu_to_le16(dur);
205 static int inline is_ieee80211_device(struct net_device *dev,
206 struct net_device *master)
208 return (wdev_priv(dev->ieee80211_ptr) ==
209 wdev_priv(master->ieee80211_ptr));
214 static ieee80211_tx_result debug_noinline
215 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
218 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
222 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
225 if (unlikely(tx->local->sw_scanning) &&
226 !ieee80211_is_probe_req(hdr->frame_control))
229 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
232 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
235 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
237 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
238 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
239 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
240 ieee80211_is_data(hdr->frame_control))) {
241 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
242 DECLARE_MAC_BUF(mac);
243 printk(KERN_DEBUG "%s: dropped data frame to not "
244 "associated station %s\n",
245 tx->dev->name, print_mac(mac, hdr->addr1));
246 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
247 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
251 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
252 tx->local->num_sta == 0 &&
253 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
255 * No associated STAs - no need to send multicast
266 /* This function is called whenever the AP is about to exceed the maximum limit
267 * of buffered frames for power saving STAs. This situation should not really
268 * happen often during normal operation, so dropping the oldest buffered packet
269 * from each queue should be OK to make some room for new frames. */
270 static void purge_old_ps_buffers(struct ieee80211_local *local)
272 int total = 0, purged = 0;
274 struct ieee80211_sub_if_data *sdata;
275 struct sta_info *sta;
278 * virtual interfaces are protected by RCU
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
283 struct ieee80211_if_ap *ap;
284 if (sdata->vif.type != NL80211_IFTYPE_AP)
287 skb = skb_dequeue(&ap->ps_bc_buf);
292 total += skb_queue_len(&ap->ps_bc_buf);
295 list_for_each_entry_rcu(sta, &local->sta_list, list) {
296 skb = skb_dequeue(&sta->ps_tx_buf);
301 total += skb_queue_len(&sta->ps_tx_buf);
306 local->total_ps_buffered = total;
307 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
308 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
309 wiphy_name(local->hw.wiphy), purged);
313 static ieee80211_tx_result
314 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
316 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
320 * broadcast/multicast frame
322 * If any of the associated stations is in power save mode,
323 * the frame is buffered to be sent after DTIM beacon frame.
324 * This is done either by the hardware or us.
327 /* powersaving STAs only in AP/VLAN mode */
331 /* no buffering for ordered frames */
332 if (ieee80211_has_order(hdr->frame_control))
335 /* no stations in PS mode */
336 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
339 /* buffered in mac80211 */
340 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
341 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
342 purge_old_ps_buffers(tx->local);
343 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
345 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
346 if (net_ratelimit()) {
347 printk(KERN_DEBUG "%s: BC TX buffer full - "
348 "dropping the oldest frame\n",
352 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
354 tx->local->total_ps_buffered++;
355 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
359 /* buffered in hardware */
360 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
365 static ieee80211_tx_result
366 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
368 struct sta_info *sta = tx->sta;
369 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
370 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
372 DECLARE_MAC_BUF(mac);
374 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
377 staflags = get_sta_flags(sta);
379 if (unlikely((staflags & WLAN_STA_PS) &&
380 !(staflags & WLAN_STA_PSPOLL))) {
381 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
382 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
384 print_mac(mac, sta->sta.addr), sta->sta.aid,
385 skb_queue_len(&sta->ps_tx_buf));
386 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
387 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
388 purge_old_ps_buffers(tx->local);
389 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
390 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
391 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
392 if (net_ratelimit()) {
393 printk(KERN_DEBUG "%s: STA %s TX "
394 "buffer full - dropping oldest frame\n",
395 tx->dev->name, print_mac(mac, sta->sta.addr));
400 tx->local->total_ps_buffered++;
402 /* Queue frame to be sent after STA sends an PS Poll frame */
403 if (skb_queue_empty(&sta->ps_tx_buf))
404 sta_info_set_tim_bit(sta);
406 info->control.jiffies = jiffies;
407 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
410 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
411 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
412 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
413 "set -> send frame\n", tx->dev->name,
414 print_mac(mac, sta->sta.addr));
416 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
417 clear_sta_flags(sta, WLAN_STA_PSPOLL);
422 static ieee80211_tx_result debug_noinline
423 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
425 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
428 if (tx->flags & IEEE80211_TX_UNICAST)
429 return ieee80211_tx_h_unicast_ps_buf(tx);
431 return ieee80211_tx_h_multicast_ps_buf(tx);
434 static ieee80211_tx_result debug_noinline
435 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
437 struct ieee80211_key *key;
438 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
439 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
441 if (unlikely(tx->skb->do_not_encrypt))
443 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
445 else if ((key = rcu_dereference(tx->sdata->default_key)))
447 else if (tx->sdata->drop_unencrypted &&
448 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
449 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
450 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
456 tx->key->tx_rx_count++;
457 /* TODO: add threshold stuff again */
459 switch (tx->key->conf.alg) {
461 if (ieee80211_is_auth(hdr->frame_control))
465 if (!ieee80211_is_data_present(hdr->frame_control))
471 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
472 tx->skb->do_not_encrypt = 1;
477 static ieee80211_tx_result debug_noinline
478 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
480 struct rate_selection rsel;
481 struct ieee80211_supported_band *sband;
482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
484 sband = tx->local->hw.wiphy->bands[tx->channel->band];
486 if (likely(tx->rate_idx < 0)) {
487 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
489 tx->sta->last_txrate_idx = rsel.rate_idx;
490 tx->rate_idx = rsel.rate_idx;
491 if (unlikely(rsel.probe_idx >= 0)) {
492 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
493 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
494 info->control.alt_retry_rate_idx = tx->rate_idx;
495 tx->rate_idx = rsel.probe_idx;
497 info->control.alt_retry_rate_idx = -1;
499 if (unlikely(tx->rate_idx < 0))
502 info->control.alt_retry_rate_idx = -1;
504 if (tx->sdata->bss_conf.use_cts_prot &&
505 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
506 tx->last_frag_rate_idx = tx->rate_idx;
507 if (rsel.probe_idx >= 0)
508 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
510 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
511 tx->rate_idx = rsel.nonerp_idx;
512 info->tx_rate_idx = rsel.nonerp_idx;
513 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
515 tx->last_frag_rate_idx = tx->rate_idx;
516 info->tx_rate_idx = tx->rate_idx;
518 info->tx_rate_idx = tx->rate_idx;
523 static ieee80211_tx_result debug_noinline
524 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
526 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
528 struct ieee80211_supported_band *sband;
530 sband = tx->local->hw.wiphy->bands[tx->channel->band];
533 info->control.sta = &tx->sta->sta;
535 if (!info->control.retry_limit) {
536 if (!is_multicast_ether_addr(hdr->addr1)) {
537 int len = min_t(int, tx->skb->len + FCS_LEN,
538 tx->local->fragmentation_threshold);
539 if (len > tx->local->rts_threshold
540 && tx->local->rts_threshold <
541 IEEE80211_MAX_RTS_THRESHOLD) {
542 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
544 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
545 info->control.retry_limit =
546 tx->local->long_retry_limit;
548 info->control.retry_limit =
549 tx->local->short_retry_limit;
552 info->control.retry_limit = 1;
556 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
557 /* Do not use multiple retry rates when sending fragmented
559 * TODO: The last fragment could still use multiple retry
561 info->control.alt_retry_rate_idx = -1;
564 /* Use CTS protection for unicast frames sent using extended rates if
565 * there are associated non-ERP stations and RTS/CTS is not configured
567 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
568 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
569 (tx->flags & IEEE80211_TX_UNICAST) &&
570 tx->sdata->bss_conf.use_cts_prot &&
571 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
572 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
574 /* Transmit data frames using short preambles if the driver supports
575 * short preambles at the selected rate and short preambles are
576 * available on the network at the current point in time. */
577 if (ieee80211_is_data(hdr->frame_control) &&
578 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
579 tx->sdata->bss_conf.use_short_preamble &&
580 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
581 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
584 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
585 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
586 struct ieee80211_rate *rate;
590 /* Do not use multiple retry rates when using RTS/CTS */
591 info->control.alt_retry_rate_idx = -1;
593 /* Use min(data rate, max base rate) as CTS/RTS rate */
594 rate = &sband->bitrates[tx->rate_idx];
596 for (idx = 0; idx < sband->n_bitrates; idx++) {
597 if (sband->bitrates[idx].bitrate > rate->bitrate)
599 if (tx->sdata->bss_conf.basic_rates & BIT(idx) &&
601 (sband->bitrates[baserate].bitrate
602 < sband->bitrates[idx].bitrate)))
607 info->control.rts_cts_rate_idx = baserate;
609 info->control.rts_cts_rate_idx = 0;
613 info->control.sta = &tx->sta->sta;
618 static ieee80211_tx_result debug_noinline
619 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
621 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
622 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
628 * Packet injection may want to control the sequence
629 * number, if we have no matching interface then we
630 * neither assign one ourselves nor ask the driver to.
632 if (unlikely(!info->control.vif))
635 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
638 if (ieee80211_hdrlen(hdr->frame_control) < 24)
641 if (!ieee80211_is_data_qos(hdr->frame_control)) {
642 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
647 * This should be true for injected/management frames only, for
648 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
649 * above since they are not QoS-data frames.
654 /* include per-STA, per-TID sequence counter */
656 qc = ieee80211_get_qos_ctl(hdr);
657 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
658 seq = &tx->sta->tid_seq[tid];
660 hdr->seq_ctrl = cpu_to_le16(*seq);
662 /* Increase the sequence number. */
663 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
668 static ieee80211_tx_result debug_noinline
669 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
671 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
672 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
673 struct sk_buff **frags, *first, *frag;
677 int frag_threshold = tx->local->fragmentation_threshold;
679 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
683 * Warn when submitting a fragmented A-MPDU frame and drop it.
684 * This scenario is handled in __ieee80211_tx_prepare but extra
685 * caution taken here as fragmented ampdu may cause Tx stop.
687 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
688 skb_get_queue_mapping(tx->skb) >=
689 ieee80211_num_regular_queues(&tx->local->hw)))
694 hdrlen = ieee80211_hdrlen(hdr->frame_control);
695 payload_len = first->len - hdrlen;
696 per_fragm = frag_threshold - hdrlen - FCS_LEN;
697 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
699 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
703 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
704 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
705 pos = first->data + hdrlen + per_fragm;
706 left = payload_len - per_fragm;
707 for (i = 0; i < num_fragm - 1; i++) {
708 struct ieee80211_hdr *fhdr;
714 /* reserve enough extra head and tail room for possible
717 dev_alloc_skb(tx->local->tx_headroom +
719 IEEE80211_ENCRYPT_HEADROOM +
720 IEEE80211_ENCRYPT_TAILROOM);
723 /* Make sure that all fragments use the same priority so
724 * that they end up using the same TX queue */
725 frag->priority = first->priority;
726 skb_reserve(frag, tx->local->tx_headroom +
727 IEEE80211_ENCRYPT_HEADROOM);
728 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
729 memcpy(fhdr, first->data, hdrlen);
730 if (i == num_fragm - 2)
731 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
732 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
733 copylen = left > per_fragm ? per_fragm : left;
734 memcpy(skb_put(frag, copylen), pos, copylen);
735 memcpy(frag->cb, first->cb, sizeof(frag->cb));
736 skb_copy_queue_mapping(frag, first);
737 frag->do_not_encrypt = first->do_not_encrypt;
742 skb_trim(first, hdrlen + per_fragm);
744 tx->num_extra_frag = num_fragm - 1;
745 tx->extra_frag = frags;
751 for (i = 0; i < num_fragm - 1; i++)
753 dev_kfree_skb(frags[i]);
756 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
760 static ieee80211_tx_result debug_noinline
761 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
766 switch (tx->key->conf.alg) {
768 return ieee80211_crypto_wep_encrypt(tx);
770 return ieee80211_crypto_tkip_encrypt(tx);
772 return ieee80211_crypto_ccmp_encrypt(tx);
780 static ieee80211_tx_result debug_noinline
781 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
783 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
785 int group_addr = is_multicast_ether_addr(hdr->addr1);
787 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
788 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
792 hdr->duration_id = ieee80211_duration(tx, group_addr,
793 tx->extra_frag[0]->len);
795 for (i = 0; i < tx->num_extra_frag; i++) {
796 if (i + 1 < tx->num_extra_frag) {
797 next_len = tx->extra_frag[i + 1]->len;
800 tx->rate_idx = tx->last_frag_rate_idx;
803 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
804 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
810 static ieee80211_tx_result debug_noinline
811 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
818 tx->sta->tx_packets++;
819 tx->sta->tx_fragments++;
820 tx->sta->tx_bytes += tx->skb->len;
821 if (tx->extra_frag) {
822 tx->sta->tx_fragments += tx->num_extra_frag;
823 for (i = 0; i < tx->num_extra_frag; i++)
824 tx->sta->tx_bytes += tx->extra_frag[i]->len;
831 /* actual transmit path */
834 * deal with packet injection down monitor interface
835 * with Radiotap Header -- only called for monitor mode interface
837 static ieee80211_tx_result
838 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
842 * this is the moment to interpret and discard the radiotap header that
843 * must be at the start of the packet injected in Monitor mode
845 * Need to take some care with endian-ness since radiotap
846 * args are little-endian
849 struct ieee80211_radiotap_iterator iterator;
850 struct ieee80211_radiotap_header *rthdr =
851 (struct ieee80211_radiotap_header *) skb->data;
852 struct ieee80211_supported_band *sband;
853 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
856 sband = tx->local->hw.wiphy->bands[tx->channel->band];
858 skb->do_not_encrypt = 1;
859 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
862 * for every radiotap entry that is present
863 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
864 * entries present, or -EINVAL on error)
870 ret = ieee80211_radiotap_iterator_next(&iterator);
875 /* see if this argument is something we can use */
876 switch (iterator.this_arg_index) {
878 * You must take care when dereferencing iterator.this_arg
879 * for multibyte types... the pointer is not aligned. Use
880 * get_unaligned((type *)iterator.this_arg) to dereference
881 * iterator.this_arg for type "type" safely on all arches.
883 case IEEE80211_RADIOTAP_RATE:
885 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
886 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
888 target_rate = (*iterator.this_arg) * 5;
889 for (i = 0; i < sband->n_bitrates; i++) {
890 struct ieee80211_rate *r;
892 r = &sband->bitrates[i];
894 if (r->bitrate == target_rate) {
901 case IEEE80211_RADIOTAP_ANTENNA:
903 * radiotap uses 0 for 1st ant, mac80211 is 1 for
906 info->antenna_sel_tx = (*iterator.this_arg) + 1;
910 case IEEE80211_RADIOTAP_DBM_TX_POWER:
911 control->power_level = *iterator.this_arg;
915 case IEEE80211_RADIOTAP_FLAGS:
916 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
918 * this indicates that the skb we have been
919 * handed has the 32-bit FCS CRC at the end...
920 * we should react to that by snipping it off
921 * because it will be recomputed and added
924 if (skb->len < (iterator.max_length + FCS_LEN))
927 skb_trim(skb, skb->len - FCS_LEN);
929 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
930 tx->skb->do_not_encrypt = 0;
931 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
932 tx->flags |= IEEE80211_TX_FRAGMENTED;
936 * Please update the file
937 * Documentation/networking/mac80211-injection.txt
938 * when parsing new fields here.
946 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
950 * remove the radiotap header
951 * iterator->max_length was sanity-checked against
952 * skb->len by iterator init
954 skb_pull(skb, iterator.max_length);
962 static ieee80211_tx_result
963 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
965 struct net_device *dev)
967 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
968 struct ieee80211_hdr *hdr;
969 struct ieee80211_sub_if_data *sdata;
970 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
974 memset(tx, 0, sizeof(*tx));
976 tx->dev = dev; /* use original interface */
978 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
979 tx->channel = local->hw.conf.channel;
981 tx->last_frag_rate_idx = -1;
983 * Set this flag (used below to indicate "automatic fragmentation"),
984 * it will be cleared/left by radiotap as desired.
986 tx->flags |= IEEE80211_TX_FRAGMENTED;
988 /* process and remove the injection radiotap header */
989 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
990 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
991 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
995 * __ieee80211_parse_tx_radiotap has now removed
996 * the radiotap header that was present and pre-filled
997 * 'tx' with tx control information.
1001 hdr = (struct ieee80211_hdr *) skb->data;
1003 tx->sta = sta_info_get(local, hdr->addr1);
1005 if (is_multicast_ether_addr(hdr->addr1)) {
1006 tx->flags &= ~IEEE80211_TX_UNICAST;
1007 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1009 tx->flags |= IEEE80211_TX_UNICAST;
1010 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1013 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1014 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1015 skb->len + FCS_LEN > local->fragmentation_threshold &&
1016 !local->ops->set_frag_threshold &&
1017 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1018 tx->flags |= IEEE80211_TX_FRAGMENTED;
1020 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1024 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1025 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1026 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1028 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1029 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1030 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1031 tx->ethertype = (pos[0] << 8) | pos[1];
1033 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1039 * NB: @tx is uninitialised when passed in here
1041 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1042 struct sk_buff *skb,
1043 struct net_device *mdev)
1045 struct net_device *dev;
1047 dev = dev_get_by_index(&init_net, skb->iif);
1048 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1054 /* initialises tx with control */
1055 __ieee80211_tx_prepare(tx, skb, dev);
1060 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1061 struct ieee80211_tx_data *tx)
1063 struct ieee80211_tx_info *info;
1067 if (netif_subqueue_stopped(local->mdev, skb))
1068 return IEEE80211_TX_AGAIN;
1069 info = IEEE80211_SKB_CB(skb);
1071 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1072 "TX to low-level driver", skb);
1073 ret = local->ops->tx(local_to_hw(local), skb);
1075 return IEEE80211_TX_AGAIN;
1076 local->mdev->trans_start = jiffies;
1077 ieee80211_led_tx(local, 1);
1079 if (tx->extra_frag) {
1080 for (i = 0; i < tx->num_extra_frag; i++) {
1081 if (!tx->extra_frag[i])
1083 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1084 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1085 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1086 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1087 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1088 if (netif_subqueue_stopped(local->mdev,
1090 return IEEE80211_TX_FRAG_AGAIN;
1091 if (i == tx->num_extra_frag) {
1092 info->tx_rate_idx = tx->last_frag_rate_idx;
1094 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1096 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1099 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1102 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1103 "TX to low-level driver",
1105 ret = local->ops->tx(local_to_hw(local),
1108 return IEEE80211_TX_FRAG_AGAIN;
1109 local->mdev->trans_start = jiffies;
1110 ieee80211_led_tx(local, 1);
1111 tx->extra_frag[i] = NULL;
1113 kfree(tx->extra_frag);
1114 tx->extra_frag = NULL;
1116 return IEEE80211_TX_OK;
1120 * Invoke TX handlers, return 0 on success and non-zero if the
1121 * frame was dropped or queued.
1123 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1125 struct sk_buff *skb = tx->skb;
1126 ieee80211_tx_result res = TX_DROP;
1129 #define CALL_TXH(txh) \
1131 if (res != TX_CONTINUE) \
1134 CALL_TXH(ieee80211_tx_h_check_assoc)
1135 CALL_TXH(ieee80211_tx_h_ps_buf)
1136 CALL_TXH(ieee80211_tx_h_select_key)
1137 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1138 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1139 CALL_TXH(ieee80211_tx_h_misc)
1140 CALL_TXH(ieee80211_tx_h_sequence)
1141 CALL_TXH(ieee80211_tx_h_fragment)
1142 /* handlers after fragment must be aware of tx info fragmentation! */
1143 CALL_TXH(ieee80211_tx_h_encrypt)
1144 CALL_TXH(ieee80211_tx_h_calculate_duration)
1145 CALL_TXH(ieee80211_tx_h_stats)
1149 if (unlikely(res == TX_DROP)) {
1150 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1152 for (i = 0; i < tx->num_extra_frag; i++)
1153 if (tx->extra_frag[i])
1154 dev_kfree_skb(tx->extra_frag[i]);
1155 kfree(tx->extra_frag);
1157 } else if (unlikely(res == TX_QUEUED)) {
1158 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1165 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1167 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1168 struct sta_info *sta;
1169 struct ieee80211_tx_data tx;
1170 ieee80211_tx_result res_prepare;
1171 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1175 queue = skb_get_queue_mapping(skb);
1177 WARN_ON(test_bit(queue, local->queues_pending));
1179 if (unlikely(skb->len < 10)) {
1186 /* initialises tx */
1187 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1189 if (res_prepare == TX_DROP) {
1196 tx.channel = local->hw.conf.channel;
1197 info->band = tx.channel->band;
1199 if (invoke_tx_handlers(&tx))
1203 ret = __ieee80211_tx(local, skb, &tx);
1205 struct ieee80211_tx_stored_packet *store;
1208 * Since there are no fragmented frames on A-MPDU
1209 * queues, there's no reason for a driver to reject
1210 * a frame there, warn and drop it.
1212 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1215 store = &local->pending_packet[queue];
1217 if (ret == IEEE80211_TX_FRAG_AGAIN)
1220 set_bit(queue, local->queues_pending);
1223 * When the driver gets out of buffers during sending of
1224 * fragments and calls ieee80211_stop_queue, the netif
1225 * subqueue is stopped. There is, however, a small window
1226 * in which the PENDING bit is not yet set. If a buffer
1227 * gets available in that window (i.e. driver calls
1228 * ieee80211_wake_queue), we would end up with ieee80211_tx
1229 * called with the PENDING bit still set. Prevent this by
1230 * continuing transmitting here when that situation is
1231 * possible to have happened.
1233 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1234 clear_bit(queue, local->queues_pending);
1238 store->extra_frag = tx.extra_frag;
1239 store->num_extra_frag = tx.num_extra_frag;
1240 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1241 store->last_frag_rate_ctrl_probe =
1242 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1251 for (i = 0; i < tx.num_extra_frag; i++)
1252 if (tx.extra_frag[i])
1253 dev_kfree_skb(tx.extra_frag[i]);
1254 kfree(tx.extra_frag);
1259 /* device xmit handlers */
1261 static int ieee80211_skb_resize(struct ieee80211_local *local,
1262 struct sk_buff *skb,
1263 int head_need, bool may_encrypt)
1268 * This could be optimised, devices that do full hardware
1269 * crypto (including TKIP MMIC) need no tailroom... But we
1270 * have no drivers for such devices currently.
1273 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1274 tail_need -= skb_tailroom(skb);
1275 tail_need = max_t(int, tail_need, 0);
1278 if (head_need || tail_need) {
1279 /* Sorry. Can't account for this any more */
1283 if (skb_header_cloned(skb))
1284 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1286 I802_DEBUG_INC(local->tx_expand_skb_head);
1288 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1289 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1290 wiphy_name(local->hw.wiphy));
1294 /* update truesize too */
1295 skb->truesize += head_need + tail_need;
1300 int ieee80211_master_start_xmit(struct sk_buff *skb,
1301 struct net_device *dev)
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(odev, dev))) {
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 memset(info, 0, sizeof(*info));
1333 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1335 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1337 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1338 ieee80211_is_data(hdr->frame_control)) {
1339 if (ieee80211_is_data(hdr->frame_control)) {
1340 if (is_multicast_ether_addr(hdr->addr3))
1341 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1343 if (mesh_nexthop_lookup(skb, osdata))
1345 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1346 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1349 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1350 struct ieee80211_sub_if_data *sdata;
1351 struct ieee80211_local *local = osdata->local;
1352 struct ieee80211_hdr *hdr;
1356 info->flags |= IEEE80211_TX_CTL_INJECTED;
1357 monitor_iface = UNKNOWN_ADDRESS;
1359 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1360 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1361 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1363 /* check the header is complete in the frame */
1364 if (likely(skb->len >= len_rthdr + hdrlen)) {
1366 * We process outgoing injected frames that have a
1367 * local address we handle as though they are our
1369 * This code here isn't entirely correct, the local
1370 * MAC address is not necessarily enough to find
1371 * the interface to use; for that proper VLAN/WDS
1372 * support we will need a different mechanism.
1376 list_for_each_entry_rcu(sdata, &local->interfaces,
1378 if (!netif_running(sdata->dev))
1380 if (compare_ether_addr(sdata->dev->dev_addr,
1382 dev_hold(sdata->dev);
1386 skb->iif = sdata->dev->ifindex;
1387 monitor_iface = FOUND_SDATA;
1395 may_encrypt = !skb->do_not_encrypt;
1397 headroom = osdata->local->tx_headroom;
1399 headroom += IEEE80211_ENCRYPT_HEADROOM;
1400 headroom -= skb_headroom(skb);
1401 headroom = max_t(int, 0, headroom);
1403 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1409 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1410 osdata = container_of(osdata->bss,
1411 struct ieee80211_sub_if_data,
1413 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1414 info->control.vif = &osdata->vif;
1415 ret = ieee80211_tx(odev, skb);
1421 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1422 struct net_device *dev)
1424 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1425 struct ieee80211_radiotap_header *prthdr =
1426 (struct ieee80211_radiotap_header *)skb->data;
1429 /* check for not even having the fixed radiotap header part */
1430 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1431 goto fail; /* too short to be possibly valid */
1433 /* is it a header version we can trust to find length from? */
1434 if (unlikely(prthdr->it_version))
1435 goto fail; /* only version 0 is supported */
1437 /* then there must be a radiotap header with a length we can use */
1438 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1440 /* does the skb contain enough to deliver on the alleged length? */
1441 if (unlikely(skb->len < len_rthdr))
1442 goto fail; /* skb too short for claimed rt header extent */
1444 skb->dev = local->mdev;
1446 /* needed because we set skb device to master */
1447 skb->iif = dev->ifindex;
1449 /* sometimes we do encrypt injected frames, will be fixed
1450 * up in radiotap parser if not wanted */
1451 skb->do_not_encrypt = 0;
1454 * fix up the pointers accounting for the radiotap
1455 * header still being in there. We are being given
1456 * a precooked IEEE80211 header so no need for
1459 skb_set_mac_header(skb, len_rthdr);
1461 * these are just fixed to the end of the rt area since we
1462 * don't have any better information and at this point, nobody cares
1464 skb_set_network_header(skb, len_rthdr);
1465 skb_set_transport_header(skb, len_rthdr);
1467 /* pass the radiotap header up to the next stage intact */
1468 dev_queue_xmit(skb);
1469 return NETDEV_TX_OK;
1473 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1477 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1478 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1479 * @skb: packet to be sent
1480 * @dev: incoming interface
1482 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1483 * not be freed, and caller is responsible for either retrying later or freeing
1486 * This function takes in an Ethernet header and encapsulates it with suitable
1487 * IEEE 802.11 header based on which interface the packet is coming in. The
1488 * encapsulated packet will then be passed to master interface, wlan#.11, for
1489 * transmission (through low-level driver).
1491 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1492 struct net_device *dev)
1494 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1495 struct ieee80211_sub_if_data *sdata;
1496 int ret = 1, head_need;
1497 u16 ethertype, hdrlen, meshhdrlen = 0;
1499 struct ieee80211_hdr hdr;
1500 struct ieee80211s_hdr mesh_hdr;
1501 const u8 *encaps_data;
1502 int encaps_len, skip_header_bytes;
1504 struct sta_info *sta;
1507 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1508 if (unlikely(skb->len < ETH_HLEN)) {
1513 nh_pos = skb_network_header(skb) - skb->data;
1514 h_pos = skb_transport_header(skb) - skb->data;
1516 /* convert Ethernet header to proper 802.11 header (based on
1517 * operation mode) */
1518 ethertype = (skb->data[12] << 8) | skb->data[13];
1519 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1521 switch (sdata->vif.type) {
1522 case NL80211_IFTYPE_AP:
1523 case NL80211_IFTYPE_AP_VLAN:
1524 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1526 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1527 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1528 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1531 case NL80211_IFTYPE_WDS:
1532 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1534 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1535 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1536 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1537 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1540 #ifdef CONFIG_MAC80211_MESH
1541 case NL80211_IFTYPE_MESH_POINT:
1542 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1544 memset(hdr.addr1, 0, 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);
1548 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1549 /* Do not send frames with mesh_ttl == 0 */
1550 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1554 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1558 case NL80211_IFTYPE_STATION:
1559 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1561 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1562 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1563 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1566 case NL80211_IFTYPE_ADHOC:
1568 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1569 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1570 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1579 * There's no need to try to look up the destination
1580 * if it is a multicast address (which can only happen
1583 if (!is_multicast_ether_addr(hdr.addr1)) {
1585 sta = sta_info_get(local, hdr.addr1);
1587 sta_flags = get_sta_flags(sta);
1591 /* receiver and we are QoS enabled, use a QoS type frame */
1592 if (sta_flags & WLAN_STA_WME &&
1593 ieee80211_num_regular_queues(&local->hw) >= 4) {
1594 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1599 * Drop unicast frames to unauthorised stations unless they are
1600 * EAPOL frames from the local station.
1602 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1603 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1604 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1605 !(ethertype == ETH_P_PAE &&
1606 compare_ether_addr(dev->dev_addr,
1607 skb->data + ETH_ALEN) == 0))) {
1608 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1609 DECLARE_MAC_BUF(mac);
1611 if (net_ratelimit())
1612 printk(KERN_DEBUG "%s: dropped frame to %s"
1613 " (unauthorized port)\n", dev->name,
1614 print_mac(mac, hdr.addr1));
1617 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1623 hdr.frame_control = fc;
1624 hdr.duration_id = 0;
1627 skip_header_bytes = ETH_HLEN;
1628 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1629 encaps_data = bridge_tunnel_header;
1630 encaps_len = sizeof(bridge_tunnel_header);
1631 skip_header_bytes -= 2;
1632 } else if (ethertype >= 0x600) {
1633 encaps_data = rfc1042_header;
1634 encaps_len = sizeof(rfc1042_header);
1635 skip_header_bytes -= 2;
1641 skb_pull(skb, skip_header_bytes);
1642 nh_pos -= skip_header_bytes;
1643 h_pos -= skip_header_bytes;
1645 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1648 * So we need to modify the skb header and hence need a copy of
1649 * that. The head_need variable above doesn't, so far, include
1650 * the needed header space that we don't need right away. If we
1651 * can, then we don't reallocate right now but only after the
1652 * frame arrives at the master device (if it does...)
1654 * If we cannot, however, then we will reallocate to include all
1655 * the ever needed space. Also, if we need to reallocate it anyway,
1656 * make it big enough for everything we may ever need.
1659 if (head_need > 0 || skb_cloned(skb)) {
1660 head_need += IEEE80211_ENCRYPT_HEADROOM;
1661 head_need += local->tx_headroom;
1662 head_need = max_t(int, 0, head_need);
1663 if (ieee80211_skb_resize(local, skb, head_need, true))
1668 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1669 nh_pos += encaps_len;
1670 h_pos += encaps_len;
1673 if (meshhdrlen > 0) {
1674 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1675 nh_pos += meshhdrlen;
1676 h_pos += meshhdrlen;
1679 if (ieee80211_is_data_qos(fc)) {
1680 __le16 *qos_control;
1682 qos_control = (__le16*) skb_push(skb, 2);
1683 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1685 * Maybe we could actually set some fields here, for now just
1686 * initialise to zero to indicate no special operation.
1690 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1695 skb->iif = dev->ifindex;
1697 skb->dev = local->mdev;
1698 dev->stats.tx_packets++;
1699 dev->stats.tx_bytes += skb->len;
1701 /* Update skb pointers to various headers since this modified frame
1702 * is going to go through Linux networking code that may potentially
1703 * need things like pointer to IP header. */
1704 skb_set_mac_header(skb, 0);
1705 skb_set_network_header(skb, nh_pos);
1706 skb_set_transport_header(skb, h_pos);
1708 dev->trans_start = jiffies;
1709 dev_queue_xmit(skb);
1722 * ieee80211_clear_tx_pending may not be called in a context where
1723 * it is possible that it packets could come in again.
1725 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1728 struct ieee80211_tx_stored_packet *store;
1730 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1731 if (!test_bit(i, local->queues_pending))
1733 store = &local->pending_packet[i];
1734 kfree_skb(store->skb);
1735 for (j = 0; j < store->num_extra_frag; j++)
1736 kfree_skb(store->extra_frag[j]);
1737 kfree(store->extra_frag);
1738 clear_bit(i, local->queues_pending);
1743 * Transmit all pending packets. Called from tasklet, locks master device
1744 * TX lock so that no new packets can come in.
1746 void ieee80211_tx_pending(unsigned long data)
1748 struct ieee80211_local *local = (struct ieee80211_local *)data;
1749 struct net_device *dev = local->mdev;
1750 struct ieee80211_tx_stored_packet *store;
1751 struct ieee80211_tx_data tx;
1754 netif_tx_lock_bh(dev);
1755 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1756 /* Check that this queue is ok */
1757 if (__netif_subqueue_stopped(local->mdev, i) &&
1758 !test_bit(i, local->queues_pending_run))
1761 if (!test_bit(i, local->queues_pending)) {
1762 clear_bit(i, local->queues_pending_run);
1763 ieee80211_wake_queue(&local->hw, i);
1767 clear_bit(i, local->queues_pending_run);
1768 netif_start_subqueue(local->mdev, i);
1770 store = &local->pending_packet[i];
1771 tx.extra_frag = store->extra_frag;
1772 tx.num_extra_frag = store->num_extra_frag;
1773 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1775 if (store->last_frag_rate_ctrl_probe)
1776 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1777 ret = __ieee80211_tx(local, store->skb, &tx);
1779 if (ret == IEEE80211_TX_FRAG_AGAIN)
1782 clear_bit(i, local->queues_pending);
1783 ieee80211_wake_queue(&local->hw, i);
1786 netif_tx_unlock_bh(dev);
1789 /* functions for drivers to get certain frames */
1791 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1792 struct ieee80211_if_ap *bss,
1793 struct sk_buff *skb,
1794 struct beacon_data *beacon)
1798 int i, have_bits = 0, n1, n2;
1800 /* Generate bitmap for TIM only if there are any STAs in power save
1802 if (atomic_read(&bss->num_sta_ps) > 0)
1803 /* in the hope that this is faster than
1804 * checking byte-for-byte */
1805 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1806 IEEE80211_MAX_AID+1);
1808 if (bss->dtim_count == 0)
1809 bss->dtim_count = beacon->dtim_period - 1;
1813 tim = pos = (u8 *) skb_put(skb, 6);
1814 *pos++ = WLAN_EID_TIM;
1816 *pos++ = bss->dtim_count;
1817 *pos++ = beacon->dtim_period;
1819 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1823 /* Find largest even number N1 so that bits numbered 1 through
1824 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1825 * (N2 + 1) x 8 through 2007 are 0. */
1827 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1834 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1841 /* Bitmap control */
1843 /* Part Virt Bitmap */
1844 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1846 tim[1] = n2 - n1 + 4;
1847 skb_put(skb, n2 - n1);
1849 *pos++ = aid0; /* Bitmap control */
1850 *pos++ = 0; /* Part Virt Bitmap */
1854 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1855 struct ieee80211_vif *vif)
1857 struct ieee80211_local *local = hw_to_local(hw);
1858 struct sk_buff *skb = NULL;
1859 struct ieee80211_tx_info *info;
1860 struct net_device *bdev;
1861 struct ieee80211_sub_if_data *sdata = NULL;
1862 struct ieee80211_if_ap *ap = NULL;
1863 struct ieee80211_if_sta *ifsta = NULL;
1864 struct rate_selection rsel;
1865 struct beacon_data *beacon;
1866 struct ieee80211_supported_band *sband;
1867 enum ieee80211_band band = local->hw.conf.channel->band;
1869 sband = local->hw.wiphy->bands[band];
1873 sdata = vif_to_sdata(vif);
1876 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1878 beacon = rcu_dereference(ap->beacon);
1881 * headroom, head length,
1882 * tail length and maximum TIM length
1884 skb = dev_alloc_skb(local->tx_headroom +
1886 beacon->tail_len + 256);
1890 skb_reserve(skb, local->tx_headroom);
1891 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1895 * Not very nice, but we want to allow the driver to call
1896 * ieee80211_beacon_get() as a response to the set_tim()
1897 * callback. That, however, is already invoked under the
1898 * sta_lock to guarantee consistent and race-free update
1899 * of the tim bitmap in mac80211 and the driver.
1901 if (local->tim_in_locked_section) {
1902 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1904 unsigned long flags;
1906 spin_lock_irqsave(&local->sta_lock, flags);
1907 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1908 spin_unlock_irqrestore(&local->sta_lock, flags);
1912 memcpy(skb_put(skb, beacon->tail_len),
1913 beacon->tail, beacon->tail_len);
1916 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1917 struct ieee80211_hdr *hdr;
1918 ifsta = &sdata->u.sta;
1920 if (!ifsta->probe_resp)
1923 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1927 hdr = (struct ieee80211_hdr *) skb->data;
1928 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1929 IEEE80211_STYPE_BEACON);
1931 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1932 struct ieee80211_mgmt *mgmt;
1935 /* headroom, head length, tail length and maximum TIM length */
1936 skb = dev_alloc_skb(local->tx_headroom + 400);
1940 skb_reserve(skb, local->hw.extra_tx_headroom);
1941 mgmt = (struct ieee80211_mgmt *)
1942 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1943 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1944 mgmt->frame_control =
1945 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1946 memset(mgmt->da, 0xff, ETH_ALEN);
1947 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1948 /* BSSID is left zeroed, wildcard value */
1949 mgmt->u.beacon.beacon_int =
1950 cpu_to_le16(local->hw.conf.beacon_int);
1951 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1953 pos = skb_put(skb, 2);
1954 *pos++ = WLAN_EID_SSID;
1957 mesh_mgmt_ies_add(skb, sdata);
1963 info = IEEE80211_SKB_CB(skb);
1965 skb->do_not_encrypt = 1;
1968 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1970 if (unlikely(rsel.rate_idx < 0)) {
1971 if (net_ratelimit()) {
1972 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1974 wiphy_name(local->hw.wiphy));
1976 dev_kfree_skb_any(skb);
1981 info->control.vif = vif;
1982 info->tx_rate_idx = rsel.rate_idx;
1984 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1985 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1986 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
1987 if (sdata->bss_conf.use_short_preamble &&
1988 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1989 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1991 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1992 info->control.retry_limit = 1;
1998 EXPORT_SYMBOL(ieee80211_beacon_get);
2000 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2001 const void *frame, size_t frame_len,
2002 const struct ieee80211_tx_info *frame_txctl,
2003 struct ieee80211_rts *rts)
2005 const struct ieee80211_hdr *hdr = frame;
2007 rts->frame_control =
2008 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2009 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2011 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2012 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2014 EXPORT_SYMBOL(ieee80211_rts_get);
2016 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2017 const void *frame, size_t frame_len,
2018 const struct ieee80211_tx_info *frame_txctl,
2019 struct ieee80211_cts *cts)
2021 const struct ieee80211_hdr *hdr = frame;
2023 cts->frame_control =
2024 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2025 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2026 frame_len, frame_txctl);
2027 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2029 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2032 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2033 struct ieee80211_vif *vif)
2035 struct ieee80211_local *local = hw_to_local(hw);
2036 struct sk_buff *skb = NULL;
2037 struct sta_info *sta;
2038 struct ieee80211_tx_data tx;
2039 struct net_device *bdev;
2040 struct ieee80211_sub_if_data *sdata;
2041 struct ieee80211_if_ap *bss = NULL;
2042 struct beacon_data *beacon;
2043 struct ieee80211_tx_info *info;
2045 sdata = vif_to_sdata(vif);
2053 beacon = rcu_dereference(bss->beacon);
2055 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2058 if (bss->dtim_count != 0)
2059 goto out; /* send buffered bc/mc only after DTIM beacon */
2062 skb = skb_dequeue(&bss->ps_bc_buf);
2065 local->total_ps_buffered--;
2067 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2068 struct ieee80211_hdr *hdr =
2069 (struct ieee80211_hdr *) skb->data;
2070 /* more buffered multicast/broadcast frames ==> set
2071 * MoreData flag in IEEE 802.11 header to inform PS
2073 hdr->frame_control |=
2074 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2077 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2079 dev_kfree_skb_any(skb);
2082 info = IEEE80211_SKB_CB(skb);
2085 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2086 tx.channel = local->hw.conf.channel;
2087 info->band = tx.channel->band;
2089 if (invoke_tx_handlers(&tx))
2096 EXPORT_SYMBOL(ieee80211_get_buffered_bc);