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;
50 sband = local->hw.wiphy->bands[tx->channel->band];
51 txrate = &sband->bitrates[tx->rate_idx];
54 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
55 erp = txrate->flags & IEEE80211_RATE_ERP_G;
58 * data and mgmt (except PS Poll):
60 * - during contention period:
61 * if addr1 is group address: 0
62 * if more fragments = 0 and addr1 is individual address: time to
63 * transmit one ACK plus SIFS
64 * if more fragments = 1 and addr1 is individual address: time to
65 * transmit next fragment plus 2 x ACK plus 3 x SIFS
68 * - control response frame (CTS or ACK) shall be transmitted using the
69 * same rate as the immediately previous frame in the frame exchange
70 * sequence, if this rate belongs to the PHY mandatory rates, or else
71 * at the highest possible rate belonging to the PHY rates in the
74 hdr = (struct ieee80211_hdr *)tx->skb->data;
75 if (ieee80211_is_ctl(hdr->frame_control)) {
76 /* TODO: These control frames are not currently sent by
77 * mac80211, but should they be implemented, this function
78 * needs to be updated to support duration field calculation.
80 * RTS: time needed to transmit pending data/mgmt frame plus
81 * one CTS frame plus one ACK frame plus 3 x SIFS
82 * CTS: duration of immediately previous RTS minus time
83 * required to transmit CTS and its SIFS
84 * ACK: 0 if immediately previous directed data/mgmt had
85 * more=0, with more=1 duration in ACK frame is duration
86 * from previous frame minus time needed to transmit ACK
88 * PS Poll: BIT(15) | BIT(14) | aid
94 if (0 /* FIX: data/mgmt during CFP */)
95 return cpu_to_le16(32768);
97 if (group_addr) /* Group address as the destination - no ACK */
100 /* Individual destination address:
101 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
102 * CTS and ACK frames shall be transmitted using the highest rate in
103 * basic rate set that is less than or equal to the rate of the
104 * immediately previous frame and that is using the same modulation
105 * (CCK or OFDM). If no basic rate set matches with these requirements,
106 * the highest mandatory rate of the PHY that is less than or equal to
107 * the rate of the previous frame is used.
108 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
111 /* use lowest available if everything fails */
112 mrate = sband->bitrates[0].bitrate;
113 for (i = 0; i < sband->n_bitrates; i++) {
114 struct ieee80211_rate *r = &sband->bitrates[i];
116 if (r->bitrate > txrate->bitrate)
119 if (tx->sdata->bss_conf.basic_rates & BIT(i))
122 switch (sband->band) {
123 case IEEE80211_BAND_2GHZ: {
125 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
126 flag = IEEE80211_RATE_MANDATORY_G;
128 flag = IEEE80211_RATE_MANDATORY_B;
133 case IEEE80211_BAND_5GHZ:
134 if (r->flags & IEEE80211_RATE_MANDATORY_A)
137 case IEEE80211_NUM_BANDS:
143 /* No matching basic rate found; use highest suitable mandatory
148 /* Time needed to transmit ACK
149 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
150 * to closest integer */
152 dur = ieee80211_frame_duration(local, 10, rate, erp,
153 tx->sdata->bss_conf.use_short_preamble);
156 /* Frame is fragmented: duration increases with time needed to
157 * transmit next fragment plus ACK and 2 x SIFS. */
158 dur *= 2; /* ACK + SIFS */
160 dur += ieee80211_frame_duration(local, next_frag_len,
161 txrate->bitrate, erp,
162 tx->sdata->bss_conf.use_short_preamble);
165 return cpu_to_le16(dur);
168 static int inline is_ieee80211_device(struct net_device *dev,
169 struct net_device *master)
171 return (wdev_priv(dev->ieee80211_ptr) ==
172 wdev_priv(master->ieee80211_ptr));
177 static ieee80211_tx_result debug_noinline
178 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
181 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
182 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
185 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
188 if (unlikely(tx->local->sw_scanning) &&
189 !ieee80211_is_probe_req(hdr->frame_control))
192 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
195 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
198 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
200 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
201 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
202 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
203 ieee80211_is_data(hdr->frame_control))) {
204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
205 DECLARE_MAC_BUF(mac);
206 printk(KERN_DEBUG "%s: dropped data frame to not "
207 "associated station %s\n",
208 tx->dev->name, print_mac(mac, hdr->addr1));
209 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
210 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
214 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
215 tx->local->num_sta == 0 &&
216 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
218 * No associated STAs - no need to send multicast
229 /* This function is called whenever the AP is about to exceed the maximum limit
230 * of buffered frames for power saving STAs. This situation should not really
231 * happen often during normal operation, so dropping the oldest buffered packet
232 * from each queue should be OK to make some room for new frames. */
233 static void purge_old_ps_buffers(struct ieee80211_local *local)
235 int total = 0, purged = 0;
237 struct ieee80211_sub_if_data *sdata;
238 struct sta_info *sta;
241 * virtual interfaces are protected by RCU
245 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
246 struct ieee80211_if_ap *ap;
247 if (sdata->vif.type != NL80211_IFTYPE_AP)
250 skb = skb_dequeue(&ap->ps_bc_buf);
255 total += skb_queue_len(&ap->ps_bc_buf);
258 list_for_each_entry_rcu(sta, &local->sta_list, list) {
259 skb = skb_dequeue(&sta->ps_tx_buf);
264 total += skb_queue_len(&sta->ps_tx_buf);
269 local->total_ps_buffered = total;
270 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
271 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
272 wiphy_name(local->hw.wiphy), purged);
276 static ieee80211_tx_result
277 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
279 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
280 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
283 * broadcast/multicast frame
285 * If any of the associated stations is in power save mode,
286 * the frame is buffered to be sent after DTIM beacon frame.
287 * This is done either by the hardware or us.
290 /* powersaving STAs only in AP/VLAN mode */
294 /* no buffering for ordered frames */
295 if (ieee80211_has_order(hdr->frame_control))
298 /* no stations in PS mode */
299 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
302 /* buffered in mac80211 */
303 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
304 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
305 purge_old_ps_buffers(tx->local);
306 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
308 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
309 if (net_ratelimit()) {
310 printk(KERN_DEBUG "%s: BC TX buffer full - "
311 "dropping the oldest frame\n",
315 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
317 tx->local->total_ps_buffered++;
318 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
322 /* buffered in hardware */
323 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
328 static ieee80211_tx_result
329 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
331 struct sta_info *sta = tx->sta;
332 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
335 DECLARE_MAC_BUF(mac);
337 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
340 staflags = get_sta_flags(sta);
342 if (unlikely((staflags & WLAN_STA_PS) &&
343 !(staflags & WLAN_STA_PSPOLL))) {
344 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
345 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
347 print_mac(mac, sta->sta.addr), sta->sta.aid,
348 skb_queue_len(&sta->ps_tx_buf));
349 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
350 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
351 purge_old_ps_buffers(tx->local);
352 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
353 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
354 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
355 if (net_ratelimit()) {
356 printk(KERN_DEBUG "%s: STA %s TX "
357 "buffer full - dropping oldest frame\n",
358 tx->dev->name, print_mac(mac, sta->sta.addr));
363 tx->local->total_ps_buffered++;
365 /* Queue frame to be sent after STA sends an PS Poll frame */
366 if (skb_queue_empty(&sta->ps_tx_buf))
367 sta_info_set_tim_bit(sta);
369 info->control.jiffies = jiffies;
370 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
373 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
374 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
375 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
376 "set -> send frame\n", tx->dev->name,
377 print_mac(mac, sta->sta.addr));
379 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
380 clear_sta_flags(sta, WLAN_STA_PSPOLL);
385 static ieee80211_tx_result debug_noinline
386 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
388 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
391 if (tx->flags & IEEE80211_TX_UNICAST)
392 return ieee80211_tx_h_unicast_ps_buf(tx);
394 return ieee80211_tx_h_multicast_ps_buf(tx);
397 static ieee80211_tx_result debug_noinline
398 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
400 struct ieee80211_key *key;
401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
404 if (unlikely(tx->skb->do_not_encrypt))
406 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
408 else if ((key = rcu_dereference(tx->sdata->default_key)))
410 else if (tx->sdata->drop_unencrypted &&
411 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
412 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
413 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
419 tx->key->tx_rx_count++;
420 /* TODO: add threshold stuff again */
422 switch (tx->key->conf.alg) {
424 if (ieee80211_is_auth(hdr->frame_control))
428 if (!ieee80211_is_data_present(hdr->frame_control))
434 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
435 tx->skb->do_not_encrypt = 1;
440 static ieee80211_tx_result debug_noinline
441 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
443 struct rate_selection rsel;
444 struct ieee80211_supported_band *sband;
445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
447 sband = tx->local->hw.wiphy->bands[tx->channel->band];
449 if (likely(tx->rate_idx < 0)) {
450 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
452 tx->sta->last_txrate_idx = rsel.rate_idx;
453 tx->rate_idx = rsel.rate_idx;
454 if (unlikely(rsel.probe_idx >= 0)) {
455 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
456 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
457 info->control.alt_retry_rate_idx = tx->rate_idx;
458 tx->rate_idx = rsel.probe_idx;
460 info->control.alt_retry_rate_idx = -1;
462 if (unlikely(tx->rate_idx < 0))
465 info->control.alt_retry_rate_idx = -1;
467 if (tx->sdata->bss_conf.use_cts_prot &&
468 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
469 tx->last_frag_rate_idx = tx->rate_idx;
470 if (rsel.probe_idx >= 0)
471 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
473 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
474 tx->rate_idx = rsel.nonerp_idx;
475 info->tx_rate_idx = rsel.nonerp_idx;
476 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
478 tx->last_frag_rate_idx = tx->rate_idx;
479 info->tx_rate_idx = tx->rate_idx;
481 info->tx_rate_idx = tx->rate_idx;
486 static ieee80211_tx_result debug_noinline
487 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
490 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
491 struct ieee80211_supported_band *sband;
493 sband = tx->local->hw.wiphy->bands[tx->channel->band];
496 info->control.sta = &tx->sta->sta;
498 if (!info->control.retry_limit) {
499 if (!is_multicast_ether_addr(hdr->addr1)) {
500 int len = min_t(int, tx->skb->len + FCS_LEN,
501 tx->local->fragmentation_threshold);
502 if (len > tx->local->rts_threshold
503 && tx->local->rts_threshold <
504 IEEE80211_MAX_RTS_THRESHOLD) {
505 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
507 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
508 info->control.retry_limit =
509 tx->local->long_retry_limit;
511 info->control.retry_limit =
512 tx->local->short_retry_limit;
515 info->control.retry_limit = 1;
519 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
520 /* Do not use multiple retry rates when sending fragmented
522 * TODO: The last fragment could still use multiple retry
524 info->control.alt_retry_rate_idx = -1;
527 /* Use CTS protection for unicast frames sent using extended rates if
528 * there are associated non-ERP stations and RTS/CTS is not configured
530 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
531 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
532 (tx->flags & IEEE80211_TX_UNICAST) &&
533 tx->sdata->bss_conf.use_cts_prot &&
534 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
535 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
537 /* Transmit data frames using short preambles if the driver supports
538 * short preambles at the selected rate and short preambles are
539 * available on the network at the current point in time. */
540 if (ieee80211_is_data(hdr->frame_control) &&
541 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
542 tx->sdata->bss_conf.use_short_preamble &&
543 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
544 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
547 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
548 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
549 struct ieee80211_rate *rate;
553 /* Do not use multiple retry rates when using RTS/CTS */
554 info->control.alt_retry_rate_idx = -1;
556 /* Use min(data rate, max base rate) as CTS/RTS rate */
557 rate = &sband->bitrates[tx->rate_idx];
559 for (idx = 0; idx < sband->n_bitrates; idx++) {
560 if (sband->bitrates[idx].bitrate > rate->bitrate)
562 if (tx->sdata->bss_conf.basic_rates & BIT(idx) &&
564 (sband->bitrates[baserate].bitrate
565 < sband->bitrates[idx].bitrate)))
570 info->control.rts_cts_rate_idx = baserate;
572 info->control.rts_cts_rate_idx = 0;
576 info->control.sta = &tx->sta->sta;
581 static ieee80211_tx_result debug_noinline
582 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
584 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
585 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
591 * Packet injection may want to control the sequence
592 * number, if we have no matching interface then we
593 * neither assign one ourselves nor ask the driver to.
595 if (unlikely(!info->control.vif))
598 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
601 if (ieee80211_hdrlen(hdr->frame_control) < 24)
604 if (!ieee80211_is_data_qos(hdr->frame_control)) {
605 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
610 * This should be true for injected/management frames only, for
611 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
612 * above since they are not QoS-data frames.
617 /* include per-STA, per-TID sequence counter */
619 qc = ieee80211_get_qos_ctl(hdr);
620 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
621 seq = &tx->sta->tid_seq[tid];
623 hdr->seq_ctrl = cpu_to_le16(*seq);
625 /* Increase the sequence number. */
626 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
631 static ieee80211_tx_result debug_noinline
632 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
634 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
635 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
636 struct sk_buff **frags, *first, *frag;
640 int frag_threshold = tx->local->fragmentation_threshold;
642 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
646 * Warn when submitting a fragmented A-MPDU frame and drop it.
647 * This scenario is handled in __ieee80211_tx_prepare but extra
648 * caution taken here as fragmented ampdu may cause Tx stop.
650 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
651 skb_get_queue_mapping(tx->skb) >=
652 ieee80211_num_regular_queues(&tx->local->hw)))
657 hdrlen = ieee80211_hdrlen(hdr->frame_control);
658 payload_len = first->len - hdrlen;
659 per_fragm = frag_threshold - hdrlen - FCS_LEN;
660 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
662 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
666 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
667 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
668 pos = first->data + hdrlen + per_fragm;
669 left = payload_len - per_fragm;
670 for (i = 0; i < num_fragm - 1; i++) {
671 struct ieee80211_hdr *fhdr;
677 /* reserve enough extra head and tail room for possible
680 dev_alloc_skb(tx->local->tx_headroom +
682 IEEE80211_ENCRYPT_HEADROOM +
683 IEEE80211_ENCRYPT_TAILROOM);
686 /* Make sure that all fragments use the same priority so
687 * that they end up using the same TX queue */
688 frag->priority = first->priority;
689 skb_reserve(frag, tx->local->tx_headroom +
690 IEEE80211_ENCRYPT_HEADROOM);
691 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
692 memcpy(fhdr, first->data, hdrlen);
693 if (i == num_fragm - 2)
694 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
695 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
696 copylen = left > per_fragm ? per_fragm : left;
697 memcpy(skb_put(frag, copylen), pos, copylen);
698 memcpy(frag->cb, first->cb, sizeof(frag->cb));
699 skb_copy_queue_mapping(frag, first);
700 frag->do_not_encrypt = first->do_not_encrypt;
705 skb_trim(first, hdrlen + per_fragm);
707 tx->num_extra_frag = num_fragm - 1;
708 tx->extra_frag = frags;
714 for (i = 0; i < num_fragm - 1; i++)
716 dev_kfree_skb(frags[i]);
719 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
723 static ieee80211_tx_result debug_noinline
724 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
729 switch (tx->key->conf.alg) {
731 return ieee80211_crypto_wep_encrypt(tx);
733 return ieee80211_crypto_tkip_encrypt(tx);
735 return ieee80211_crypto_ccmp_encrypt(tx);
743 static ieee80211_tx_result debug_noinline
744 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
748 int group_addr = is_multicast_ether_addr(hdr->addr1);
750 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
751 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
755 hdr->duration_id = ieee80211_duration(tx, group_addr,
756 tx->extra_frag[0]->len);
758 for (i = 0; i < tx->num_extra_frag; i++) {
759 if (i + 1 < tx->num_extra_frag) {
760 next_len = tx->extra_frag[i + 1]->len;
763 tx->rate_idx = tx->last_frag_rate_idx;
766 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
767 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
773 static ieee80211_tx_result debug_noinline
774 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
781 tx->sta->tx_packets++;
782 tx->sta->tx_fragments++;
783 tx->sta->tx_bytes += tx->skb->len;
784 if (tx->extra_frag) {
785 tx->sta->tx_fragments += tx->num_extra_frag;
786 for (i = 0; i < tx->num_extra_frag; i++)
787 tx->sta->tx_bytes += tx->extra_frag[i]->len;
794 /* actual transmit path */
797 * deal with packet injection down monitor interface
798 * with Radiotap Header -- only called for monitor mode interface
800 static ieee80211_tx_result
801 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
805 * this is the moment to interpret and discard the radiotap header that
806 * must be at the start of the packet injected in Monitor mode
808 * Need to take some care with endian-ness since radiotap
809 * args are little-endian
812 struct ieee80211_radiotap_iterator iterator;
813 struct ieee80211_radiotap_header *rthdr =
814 (struct ieee80211_radiotap_header *) skb->data;
815 struct ieee80211_supported_band *sband;
816 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
817 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
819 sband = tx->local->hw.wiphy->bands[tx->channel->band];
821 skb->do_not_encrypt = 1;
822 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
825 * for every radiotap entry that is present
826 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
827 * entries present, or -EINVAL on error)
833 ret = ieee80211_radiotap_iterator_next(&iterator);
838 /* see if this argument is something we can use */
839 switch (iterator.this_arg_index) {
841 * You must take care when dereferencing iterator.this_arg
842 * for multibyte types... the pointer is not aligned. Use
843 * get_unaligned((type *)iterator.this_arg) to dereference
844 * iterator.this_arg for type "type" safely on all arches.
846 case IEEE80211_RADIOTAP_RATE:
848 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
849 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
851 target_rate = (*iterator.this_arg) * 5;
852 for (i = 0; i < sband->n_bitrates; i++) {
853 struct ieee80211_rate *r;
855 r = &sband->bitrates[i];
857 if (r->bitrate == target_rate) {
864 case IEEE80211_RADIOTAP_ANTENNA:
866 * radiotap uses 0 for 1st ant, mac80211 is 1 for
869 info->antenna_sel_tx = (*iterator.this_arg) + 1;
873 case IEEE80211_RADIOTAP_DBM_TX_POWER:
874 control->power_level = *iterator.this_arg;
878 case IEEE80211_RADIOTAP_FLAGS:
879 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
881 * this indicates that the skb we have been
882 * handed has the 32-bit FCS CRC at the end...
883 * we should react to that by snipping it off
884 * because it will be recomputed and added
887 if (skb->len < (iterator.max_length + FCS_LEN))
890 skb_trim(skb, skb->len - FCS_LEN);
892 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
893 tx->skb->do_not_encrypt = 0;
894 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
895 tx->flags |= IEEE80211_TX_FRAGMENTED;
899 * Please update the file
900 * Documentation/networking/mac80211-injection.txt
901 * when parsing new fields here.
909 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
913 * remove the radiotap header
914 * iterator->max_length was sanity-checked against
915 * skb->len by iterator init
917 skb_pull(skb, iterator.max_length);
925 static ieee80211_tx_result
926 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
928 struct net_device *dev)
930 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
931 struct ieee80211_hdr *hdr;
932 struct ieee80211_sub_if_data *sdata;
933 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
937 memset(tx, 0, sizeof(*tx));
939 tx->dev = dev; /* use original interface */
941 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
942 tx->channel = local->hw.conf.channel;
944 tx->last_frag_rate_idx = -1;
946 * Set this flag (used below to indicate "automatic fragmentation"),
947 * it will be cleared/left by radiotap as desired.
949 tx->flags |= IEEE80211_TX_FRAGMENTED;
951 /* process and remove the injection radiotap header */
952 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
953 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
954 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
958 * __ieee80211_parse_tx_radiotap has now removed
959 * the radiotap header that was present and pre-filled
960 * 'tx' with tx control information.
964 hdr = (struct ieee80211_hdr *) skb->data;
966 tx->sta = sta_info_get(local, hdr->addr1);
968 if (is_multicast_ether_addr(hdr->addr1)) {
969 tx->flags &= ~IEEE80211_TX_UNICAST;
970 info->flags |= IEEE80211_TX_CTL_NO_ACK;
972 tx->flags |= IEEE80211_TX_UNICAST;
973 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
976 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
977 if ((tx->flags & IEEE80211_TX_UNICAST) &&
978 skb->len + FCS_LEN > local->fragmentation_threshold &&
979 !local->ops->set_frag_threshold &&
980 !(info->flags & IEEE80211_TX_CTL_AMPDU))
981 tx->flags |= IEEE80211_TX_FRAGMENTED;
983 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
987 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
988 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
989 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
991 hdrlen = ieee80211_hdrlen(hdr->frame_control);
992 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
993 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
994 tx->ethertype = (pos[0] << 8) | pos[1];
996 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1002 * NB: @tx is uninitialised when passed in here
1004 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1005 struct sk_buff *skb,
1006 struct net_device *mdev)
1008 struct net_device *dev;
1010 dev = dev_get_by_index(&init_net, skb->iif);
1011 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1017 /* initialises tx with control */
1018 __ieee80211_tx_prepare(tx, skb, dev);
1023 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1024 struct ieee80211_tx_data *tx)
1026 struct ieee80211_tx_info *info;
1030 if (netif_subqueue_stopped(local->mdev, skb))
1031 return IEEE80211_TX_AGAIN;
1032 info = IEEE80211_SKB_CB(skb);
1034 ret = local->ops->tx(local_to_hw(local), skb);
1036 return IEEE80211_TX_AGAIN;
1037 local->mdev->trans_start = jiffies;
1038 ieee80211_led_tx(local, 1);
1040 if (tx->extra_frag) {
1041 for (i = 0; i < tx->num_extra_frag; i++) {
1042 if (!tx->extra_frag[i])
1044 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1045 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1046 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1047 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1048 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1049 if (netif_subqueue_stopped(local->mdev,
1051 return IEEE80211_TX_FRAG_AGAIN;
1052 if (i == tx->num_extra_frag) {
1053 info->tx_rate_idx = tx->last_frag_rate_idx;
1055 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1057 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1060 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1063 ret = local->ops->tx(local_to_hw(local),
1066 return IEEE80211_TX_FRAG_AGAIN;
1067 local->mdev->trans_start = jiffies;
1068 ieee80211_led_tx(local, 1);
1069 tx->extra_frag[i] = NULL;
1071 kfree(tx->extra_frag);
1072 tx->extra_frag = NULL;
1074 return IEEE80211_TX_OK;
1078 * Invoke TX handlers, return 0 on success and non-zero if the
1079 * frame was dropped or queued.
1081 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1083 struct sk_buff *skb = tx->skb;
1084 ieee80211_tx_result res = TX_DROP;
1087 #define CALL_TXH(txh) \
1089 if (res != TX_CONTINUE) \
1092 CALL_TXH(ieee80211_tx_h_check_assoc)
1093 CALL_TXH(ieee80211_tx_h_ps_buf)
1094 CALL_TXH(ieee80211_tx_h_select_key)
1095 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1096 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1097 CALL_TXH(ieee80211_tx_h_misc)
1098 CALL_TXH(ieee80211_tx_h_sequence)
1099 CALL_TXH(ieee80211_tx_h_fragment)
1100 /* handlers after fragment must be aware of tx info fragmentation! */
1101 CALL_TXH(ieee80211_tx_h_encrypt)
1102 CALL_TXH(ieee80211_tx_h_calculate_duration)
1103 CALL_TXH(ieee80211_tx_h_stats)
1107 if (unlikely(res == TX_DROP)) {
1108 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1110 for (i = 0; i < tx->num_extra_frag; i++)
1111 if (tx->extra_frag[i])
1112 dev_kfree_skb(tx->extra_frag[i]);
1113 kfree(tx->extra_frag);
1115 } else if (unlikely(res == TX_QUEUED)) {
1116 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1123 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1125 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1126 struct sta_info *sta;
1127 struct ieee80211_tx_data tx;
1128 ieee80211_tx_result res_prepare;
1129 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1133 queue = skb_get_queue_mapping(skb);
1135 WARN_ON(test_bit(queue, local->queues_pending));
1137 if (unlikely(skb->len < 10)) {
1144 /* initialises tx */
1145 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1147 if (res_prepare == TX_DROP) {
1154 tx.channel = local->hw.conf.channel;
1155 info->band = tx.channel->band;
1157 if (invoke_tx_handlers(&tx))
1161 ret = __ieee80211_tx(local, skb, &tx);
1163 struct ieee80211_tx_stored_packet *store;
1166 * Since there are no fragmented frames on A-MPDU
1167 * queues, there's no reason for a driver to reject
1168 * a frame there, warn and drop it.
1170 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1173 store = &local->pending_packet[queue];
1175 if (ret == IEEE80211_TX_FRAG_AGAIN)
1178 set_bit(queue, local->queues_pending);
1181 * When the driver gets out of buffers during sending of
1182 * fragments and calls ieee80211_stop_queue, the netif
1183 * subqueue is stopped. There is, however, a small window
1184 * in which the PENDING bit is not yet set. If a buffer
1185 * gets available in that window (i.e. driver calls
1186 * ieee80211_wake_queue), we would end up with ieee80211_tx
1187 * called with the PENDING bit still set. Prevent this by
1188 * continuing transmitting here when that situation is
1189 * possible to have happened.
1191 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1192 clear_bit(queue, local->queues_pending);
1196 store->extra_frag = tx.extra_frag;
1197 store->num_extra_frag = tx.num_extra_frag;
1198 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1199 store->last_frag_rate_ctrl_probe =
1200 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1209 for (i = 0; i < tx.num_extra_frag; i++)
1210 if (tx.extra_frag[i])
1211 dev_kfree_skb(tx.extra_frag[i]);
1212 kfree(tx.extra_frag);
1217 /* device xmit handlers */
1219 static int ieee80211_skb_resize(struct ieee80211_local *local,
1220 struct sk_buff *skb,
1221 int head_need, bool may_encrypt)
1226 * This could be optimised, devices that do full hardware
1227 * crypto (including TKIP MMIC) need no tailroom... But we
1228 * have no drivers for such devices currently.
1231 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1232 tail_need -= skb_tailroom(skb);
1233 tail_need = max_t(int, tail_need, 0);
1236 if (head_need || tail_need) {
1237 /* Sorry. Can't account for this any more */
1241 if (skb_header_cloned(skb))
1242 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1244 I802_DEBUG_INC(local->tx_expand_skb_head);
1246 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1247 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1248 wiphy_name(local->hw.wiphy));
1252 /* update truesize too */
1253 skb->truesize += head_need + tail_need;
1258 int ieee80211_master_start_xmit(struct sk_buff *skb,
1259 struct net_device *dev)
1261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1262 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1263 struct net_device *odev = NULL;
1264 struct ieee80211_sub_if_data *osdata;
1271 } monitor_iface = NOT_MONITOR;
1275 odev = dev_get_by_index(&init_net, skb->iif);
1276 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1280 if (unlikely(!odev)) {
1281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1282 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1283 "originating device\n", dev->name);
1289 memset(info, 0, sizeof(*info));
1291 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1293 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1295 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1296 ieee80211_is_data(hdr->frame_control)) {
1297 if (ieee80211_is_data(hdr->frame_control)) {
1298 if (is_multicast_ether_addr(hdr->addr3))
1299 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1301 if (mesh_nexthop_lookup(skb, osdata))
1303 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1304 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1307 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1308 struct ieee80211_sub_if_data *sdata;
1309 struct ieee80211_local *local = osdata->local;
1310 struct ieee80211_hdr *hdr;
1314 info->flags |= IEEE80211_TX_CTL_INJECTED;
1315 monitor_iface = UNKNOWN_ADDRESS;
1317 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1318 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1319 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1321 /* check the header is complete in the frame */
1322 if (likely(skb->len >= len_rthdr + hdrlen)) {
1324 * We process outgoing injected frames that have a
1325 * local address we handle as though they are our
1327 * This code here isn't entirely correct, the local
1328 * MAC address is not necessarily enough to find
1329 * the interface to use; for that proper VLAN/WDS
1330 * support we will need a different mechanism.
1334 list_for_each_entry_rcu(sdata, &local->interfaces,
1336 if (!netif_running(sdata->dev))
1338 if (compare_ether_addr(sdata->dev->dev_addr,
1340 dev_hold(sdata->dev);
1344 skb->iif = sdata->dev->ifindex;
1345 monitor_iface = FOUND_SDATA;
1353 may_encrypt = !skb->do_not_encrypt;
1355 headroom = osdata->local->tx_headroom;
1357 headroom += IEEE80211_ENCRYPT_HEADROOM;
1358 headroom -= skb_headroom(skb);
1359 headroom = max_t(int, 0, headroom);
1361 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1367 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1368 osdata = container_of(osdata->bss,
1369 struct ieee80211_sub_if_data,
1371 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1372 info->control.vif = &osdata->vif;
1373 ret = ieee80211_tx(odev, skb);
1379 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1380 struct net_device *dev)
1382 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1383 struct ieee80211_radiotap_header *prthdr =
1384 (struct ieee80211_radiotap_header *)skb->data;
1387 /* check for not even having the fixed radiotap header part */
1388 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1389 goto fail; /* too short to be possibly valid */
1391 /* is it a header version we can trust to find length from? */
1392 if (unlikely(prthdr->it_version))
1393 goto fail; /* only version 0 is supported */
1395 /* then there must be a radiotap header with a length we can use */
1396 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1398 /* does the skb contain enough to deliver on the alleged length? */
1399 if (unlikely(skb->len < len_rthdr))
1400 goto fail; /* skb too short for claimed rt header extent */
1402 skb->dev = local->mdev;
1404 /* needed because we set skb device to master */
1405 skb->iif = dev->ifindex;
1407 /* sometimes we do encrypt injected frames, will be fixed
1408 * up in radiotap parser if not wanted */
1409 skb->do_not_encrypt = 0;
1412 * fix up the pointers accounting for the radiotap
1413 * header still being in there. We are being given
1414 * a precooked IEEE80211 header so no need for
1417 skb_set_mac_header(skb, len_rthdr);
1419 * these are just fixed to the end of the rt area since we
1420 * don't have any better information and at this point, nobody cares
1422 skb_set_network_header(skb, len_rthdr);
1423 skb_set_transport_header(skb, len_rthdr);
1425 /* pass the radiotap header up to the next stage intact */
1426 dev_queue_xmit(skb);
1427 return NETDEV_TX_OK;
1431 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1435 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1436 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1437 * @skb: packet to be sent
1438 * @dev: incoming interface
1440 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1441 * not be freed, and caller is responsible for either retrying later or freeing
1444 * This function takes in an Ethernet header and encapsulates it with suitable
1445 * IEEE 802.11 header based on which interface the packet is coming in. The
1446 * encapsulated packet will then be passed to master interface, wlan#.11, for
1447 * transmission (through low-level driver).
1449 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1450 struct net_device *dev)
1452 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1453 struct ieee80211_sub_if_data *sdata;
1454 int ret = 1, head_need;
1455 u16 ethertype, hdrlen, meshhdrlen = 0;
1457 struct ieee80211_hdr hdr;
1458 struct ieee80211s_hdr mesh_hdr;
1459 const u8 *encaps_data;
1460 int encaps_len, skip_header_bytes;
1462 struct sta_info *sta;
1465 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1466 if (unlikely(skb->len < ETH_HLEN)) {
1471 nh_pos = skb_network_header(skb) - skb->data;
1472 h_pos = skb_transport_header(skb) - skb->data;
1474 /* convert Ethernet header to proper 802.11 header (based on
1475 * operation mode) */
1476 ethertype = (skb->data[12] << 8) | skb->data[13];
1477 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1479 switch (sdata->vif.type) {
1480 case NL80211_IFTYPE_AP:
1481 case NL80211_IFTYPE_AP_VLAN:
1482 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1484 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1485 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1486 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1489 case NL80211_IFTYPE_WDS:
1490 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1492 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1493 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1494 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1495 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1498 #ifdef CONFIG_MAC80211_MESH
1499 case NL80211_IFTYPE_MESH_POINT:
1500 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1502 memset(hdr.addr1, 0, ETH_ALEN);
1503 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1504 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1505 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1506 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1507 /* Do not send frames with mesh_ttl == 0 */
1508 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1512 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1516 case NL80211_IFTYPE_STATION:
1517 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1519 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1520 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1521 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1524 case NL80211_IFTYPE_ADHOC:
1526 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1527 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1528 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1537 * There's no need to try to look up the destination
1538 * if it is a multicast address (which can only happen
1541 if (!is_multicast_ether_addr(hdr.addr1)) {
1543 sta = sta_info_get(local, hdr.addr1);
1545 sta_flags = get_sta_flags(sta);
1549 /* receiver and we are QoS enabled, use a QoS type frame */
1550 if (sta_flags & WLAN_STA_WME &&
1551 ieee80211_num_regular_queues(&local->hw) >= 4) {
1552 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1557 * Drop unicast frames to unauthorised stations unless they are
1558 * EAPOL frames from the local station.
1560 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1561 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1562 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1563 !(ethertype == ETH_P_PAE &&
1564 compare_ether_addr(dev->dev_addr,
1565 skb->data + ETH_ALEN) == 0))) {
1566 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1567 DECLARE_MAC_BUF(mac);
1569 if (net_ratelimit())
1570 printk(KERN_DEBUG "%s: dropped frame to %s"
1571 " (unauthorized port)\n", dev->name,
1572 print_mac(mac, hdr.addr1));
1575 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1581 hdr.frame_control = fc;
1582 hdr.duration_id = 0;
1585 skip_header_bytes = ETH_HLEN;
1586 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1587 encaps_data = bridge_tunnel_header;
1588 encaps_len = sizeof(bridge_tunnel_header);
1589 skip_header_bytes -= 2;
1590 } else if (ethertype >= 0x600) {
1591 encaps_data = rfc1042_header;
1592 encaps_len = sizeof(rfc1042_header);
1593 skip_header_bytes -= 2;
1599 skb_pull(skb, skip_header_bytes);
1600 nh_pos -= skip_header_bytes;
1601 h_pos -= skip_header_bytes;
1603 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1606 * So we need to modify the skb header and hence need a copy of
1607 * that. The head_need variable above doesn't, so far, include
1608 * the needed header space that we don't need right away. If we
1609 * can, then we don't reallocate right now but only after the
1610 * frame arrives at the master device (if it does...)
1612 * If we cannot, however, then we will reallocate to include all
1613 * the ever needed space. Also, if we need to reallocate it anyway,
1614 * make it big enough for everything we may ever need.
1617 if (head_need > 0 || skb_cloned(skb)) {
1618 head_need += IEEE80211_ENCRYPT_HEADROOM;
1619 head_need += local->tx_headroom;
1620 head_need = max_t(int, 0, head_need);
1621 if (ieee80211_skb_resize(local, skb, head_need, true))
1626 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1627 nh_pos += encaps_len;
1628 h_pos += encaps_len;
1631 if (meshhdrlen > 0) {
1632 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1633 nh_pos += meshhdrlen;
1634 h_pos += meshhdrlen;
1637 if (ieee80211_is_data_qos(fc)) {
1638 __le16 *qos_control;
1640 qos_control = (__le16*) skb_push(skb, 2);
1641 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1643 * Maybe we could actually set some fields here, for now just
1644 * initialise to zero to indicate no special operation.
1648 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1653 skb->iif = dev->ifindex;
1655 skb->dev = local->mdev;
1656 dev->stats.tx_packets++;
1657 dev->stats.tx_bytes += skb->len;
1659 /* Update skb pointers to various headers since this modified frame
1660 * is going to go through Linux networking code that may potentially
1661 * need things like pointer to IP header. */
1662 skb_set_mac_header(skb, 0);
1663 skb_set_network_header(skb, nh_pos);
1664 skb_set_transport_header(skb, h_pos);
1666 dev->trans_start = jiffies;
1667 dev_queue_xmit(skb);
1680 * ieee80211_clear_tx_pending may not be called in a context where
1681 * it is possible that it packets could come in again.
1683 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1686 struct ieee80211_tx_stored_packet *store;
1688 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1689 if (!test_bit(i, local->queues_pending))
1691 store = &local->pending_packet[i];
1692 kfree_skb(store->skb);
1693 for (j = 0; j < store->num_extra_frag; j++)
1694 kfree_skb(store->extra_frag[j]);
1695 kfree(store->extra_frag);
1696 clear_bit(i, local->queues_pending);
1701 * Transmit all pending packets. Called from tasklet, locks master device
1702 * TX lock so that no new packets can come in.
1704 void ieee80211_tx_pending(unsigned long data)
1706 struct ieee80211_local *local = (struct ieee80211_local *)data;
1707 struct net_device *dev = local->mdev;
1708 struct ieee80211_tx_stored_packet *store;
1709 struct ieee80211_tx_data tx;
1712 netif_tx_lock_bh(dev);
1713 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1714 /* Check that this queue is ok */
1715 if (__netif_subqueue_stopped(local->mdev, i) &&
1716 !test_bit(i, local->queues_pending_run))
1719 if (!test_bit(i, local->queues_pending)) {
1720 clear_bit(i, local->queues_pending_run);
1721 ieee80211_wake_queue(&local->hw, i);
1725 clear_bit(i, local->queues_pending_run);
1726 netif_start_subqueue(local->mdev, i);
1728 store = &local->pending_packet[i];
1729 tx.extra_frag = store->extra_frag;
1730 tx.num_extra_frag = store->num_extra_frag;
1731 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1733 if (store->last_frag_rate_ctrl_probe)
1734 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1735 ret = __ieee80211_tx(local, store->skb, &tx);
1737 if (ret == IEEE80211_TX_FRAG_AGAIN)
1740 clear_bit(i, local->queues_pending);
1741 ieee80211_wake_queue(&local->hw, i);
1744 netif_tx_unlock_bh(dev);
1747 /* functions for drivers to get certain frames */
1749 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1750 struct ieee80211_if_ap *bss,
1751 struct sk_buff *skb,
1752 struct beacon_data *beacon)
1756 int i, have_bits = 0, n1, n2;
1758 /* Generate bitmap for TIM only if there are any STAs in power save
1760 if (atomic_read(&bss->num_sta_ps) > 0)
1761 /* in the hope that this is faster than
1762 * checking byte-for-byte */
1763 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1764 IEEE80211_MAX_AID+1);
1766 if (bss->dtim_count == 0)
1767 bss->dtim_count = beacon->dtim_period - 1;
1771 tim = pos = (u8 *) skb_put(skb, 6);
1772 *pos++ = WLAN_EID_TIM;
1774 *pos++ = bss->dtim_count;
1775 *pos++ = beacon->dtim_period;
1777 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1781 /* Find largest even number N1 so that bits numbered 1 through
1782 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1783 * (N2 + 1) x 8 through 2007 are 0. */
1785 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1792 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1799 /* Bitmap control */
1801 /* Part Virt Bitmap */
1802 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1804 tim[1] = n2 - n1 + 4;
1805 skb_put(skb, n2 - n1);
1807 *pos++ = aid0; /* Bitmap control */
1808 *pos++ = 0; /* Part Virt Bitmap */
1812 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1813 struct ieee80211_vif *vif)
1815 struct ieee80211_local *local = hw_to_local(hw);
1816 struct sk_buff *skb = NULL;
1817 struct ieee80211_tx_info *info;
1818 struct net_device *bdev;
1819 struct ieee80211_sub_if_data *sdata = NULL;
1820 struct ieee80211_if_ap *ap = NULL;
1821 struct ieee80211_if_sta *ifsta = NULL;
1822 struct rate_selection rsel;
1823 struct beacon_data *beacon;
1824 struct ieee80211_supported_band *sband;
1825 enum ieee80211_band band = local->hw.conf.channel->band;
1827 sband = local->hw.wiphy->bands[band];
1831 sdata = vif_to_sdata(vif);
1834 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1836 beacon = rcu_dereference(ap->beacon);
1839 * headroom, head length,
1840 * tail length and maximum TIM length
1842 skb = dev_alloc_skb(local->tx_headroom +
1844 beacon->tail_len + 256);
1848 skb_reserve(skb, local->tx_headroom);
1849 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1853 * Not very nice, but we want to allow the driver to call
1854 * ieee80211_beacon_get() as a response to the set_tim()
1855 * callback. That, however, is already invoked under the
1856 * sta_lock to guarantee consistent and race-free update
1857 * of the tim bitmap in mac80211 and the driver.
1859 if (local->tim_in_locked_section) {
1860 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1862 unsigned long flags;
1864 spin_lock_irqsave(&local->sta_lock, flags);
1865 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1866 spin_unlock_irqrestore(&local->sta_lock, flags);
1870 memcpy(skb_put(skb, beacon->tail_len),
1871 beacon->tail, beacon->tail_len);
1874 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1875 struct ieee80211_hdr *hdr;
1876 ifsta = &sdata->u.sta;
1878 if (!ifsta->probe_resp)
1881 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1885 hdr = (struct ieee80211_hdr *) skb->data;
1886 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1887 IEEE80211_STYPE_BEACON);
1889 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1890 struct ieee80211_mgmt *mgmt;
1893 /* headroom, head length, tail length and maximum TIM length */
1894 skb = dev_alloc_skb(local->tx_headroom + 400);
1898 skb_reserve(skb, local->hw.extra_tx_headroom);
1899 mgmt = (struct ieee80211_mgmt *)
1900 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1901 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1902 mgmt->frame_control =
1903 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1904 memset(mgmt->da, 0xff, ETH_ALEN);
1905 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1906 /* BSSID is left zeroed, wildcard value */
1907 mgmt->u.beacon.beacon_int =
1908 cpu_to_le16(local->hw.conf.beacon_int);
1909 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1911 pos = skb_put(skb, 2);
1912 *pos++ = WLAN_EID_SSID;
1915 mesh_mgmt_ies_add(skb, sdata);
1921 info = IEEE80211_SKB_CB(skb);
1923 skb->do_not_encrypt = 1;
1926 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1928 if (unlikely(rsel.rate_idx < 0)) {
1929 if (net_ratelimit()) {
1930 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1932 wiphy_name(local->hw.wiphy));
1934 dev_kfree_skb_any(skb);
1939 info->control.vif = vif;
1940 info->tx_rate_idx = rsel.rate_idx;
1942 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1943 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1944 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
1945 if (sdata->bss_conf.use_short_preamble &&
1946 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1947 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1949 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1950 info->control.retry_limit = 1;
1956 EXPORT_SYMBOL(ieee80211_beacon_get);
1958 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1959 const void *frame, size_t frame_len,
1960 const struct ieee80211_tx_info *frame_txctl,
1961 struct ieee80211_rts *rts)
1963 const struct ieee80211_hdr *hdr = frame;
1965 rts->frame_control =
1966 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
1967 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1969 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1970 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1972 EXPORT_SYMBOL(ieee80211_rts_get);
1974 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1975 const void *frame, size_t frame_len,
1976 const struct ieee80211_tx_info *frame_txctl,
1977 struct ieee80211_cts *cts)
1979 const struct ieee80211_hdr *hdr = frame;
1981 cts->frame_control =
1982 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
1983 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1984 frame_len, frame_txctl);
1985 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1987 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1990 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1991 struct ieee80211_vif *vif)
1993 struct ieee80211_local *local = hw_to_local(hw);
1994 struct sk_buff *skb = NULL;
1995 struct sta_info *sta;
1996 struct ieee80211_tx_data tx;
1997 struct net_device *bdev;
1998 struct ieee80211_sub_if_data *sdata;
1999 struct ieee80211_if_ap *bss = NULL;
2000 struct beacon_data *beacon;
2001 struct ieee80211_tx_info *info;
2003 sdata = vif_to_sdata(vif);
2011 beacon = rcu_dereference(bss->beacon);
2013 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2016 if (bss->dtim_count != 0)
2017 goto out; /* send buffered bc/mc only after DTIM beacon */
2020 skb = skb_dequeue(&bss->ps_bc_buf);
2023 local->total_ps_buffered--;
2025 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2026 struct ieee80211_hdr *hdr =
2027 (struct ieee80211_hdr *) skb->data;
2028 /* more buffered multicast/broadcast frames ==> set
2029 * MoreData flag in IEEE 802.11 header to inform PS
2031 hdr->frame_control |=
2032 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2035 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2037 dev_kfree_skb_any(skb);
2040 info = IEEE80211_SKB_CB(skb);
2043 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2044 tx.channel = local->hw.conf.channel;
2045 info->band = tx.channel->band;
2047 if (invoke_tx_handlers(&tx))
2054 EXPORT_SYMBOL(ieee80211_get_buffered_bc);