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;
627 /* only for injected frames */
628 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
631 if (ieee80211_hdrlen(hdr->frame_control) < 24)
634 if (!ieee80211_is_data_qos(hdr->frame_control)) {
635 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
640 * This should be true for injected/management frames only, for
641 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
642 * above since they are not QoS-data frames.
647 /* include per-STA, per-TID sequence counter */
649 qc = ieee80211_get_qos_ctl(hdr);
650 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
651 seq = &tx->sta->tid_seq[tid];
653 hdr->seq_ctrl = cpu_to_le16(*seq);
655 /* Increase the sequence number. */
656 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
664 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
665 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
666 struct sk_buff **frags, *first, *frag;
670 int frag_threshold = tx->local->fragmentation_threshold;
672 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
676 * Warn when submitting a fragmented A-MPDU frame and drop it.
677 * This scenario is handled in __ieee80211_tx_prepare but extra
678 * caution taken here as fragmented ampdu may cause Tx stop.
680 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
681 skb_get_queue_mapping(tx->skb) >=
682 ieee80211_num_regular_queues(&tx->local->hw)))
687 hdrlen = ieee80211_hdrlen(hdr->frame_control);
688 payload_len = first->len - hdrlen;
689 per_fragm = frag_threshold - hdrlen - FCS_LEN;
690 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
692 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
696 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
697 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
698 pos = first->data + hdrlen + per_fragm;
699 left = payload_len - per_fragm;
700 for (i = 0; i < num_fragm - 1; i++) {
701 struct ieee80211_hdr *fhdr;
707 /* reserve enough extra head and tail room for possible
710 dev_alloc_skb(tx->local->tx_headroom +
712 IEEE80211_ENCRYPT_HEADROOM +
713 IEEE80211_ENCRYPT_TAILROOM);
716 /* Make sure that all fragments use the same priority so
717 * that they end up using the same TX queue */
718 frag->priority = first->priority;
719 skb_reserve(frag, tx->local->tx_headroom +
720 IEEE80211_ENCRYPT_HEADROOM);
721 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
722 memcpy(fhdr, first->data, hdrlen);
723 if (i == num_fragm - 2)
724 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
725 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
726 copylen = left > per_fragm ? per_fragm : left;
727 memcpy(skb_put(frag, copylen), pos, copylen);
728 memcpy(frag->cb, first->cb, sizeof(frag->cb));
729 skb_copy_queue_mapping(frag, first);
730 frag->do_not_encrypt = first->do_not_encrypt;
735 skb_trim(first, hdrlen + per_fragm);
737 tx->num_extra_frag = num_fragm - 1;
738 tx->extra_frag = frags;
744 for (i = 0; i < num_fragm - 1; i++)
746 dev_kfree_skb(frags[i]);
749 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
753 static ieee80211_tx_result debug_noinline
754 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
759 switch (tx->key->conf.alg) {
761 return ieee80211_crypto_wep_encrypt(tx);
763 return ieee80211_crypto_tkip_encrypt(tx);
765 return ieee80211_crypto_ccmp_encrypt(tx);
773 static ieee80211_tx_result debug_noinline
774 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
776 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
778 int group_addr = is_multicast_ether_addr(hdr->addr1);
780 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
781 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
785 hdr->duration_id = ieee80211_duration(tx, group_addr,
786 tx->extra_frag[0]->len);
788 for (i = 0; i < tx->num_extra_frag; i++) {
789 if (i + 1 < tx->num_extra_frag) {
790 next_len = tx->extra_frag[i + 1]->len;
793 tx->rate_idx = tx->last_frag_rate_idx;
796 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
797 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
803 static ieee80211_tx_result debug_noinline
804 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
811 tx->sta->tx_packets++;
812 tx->sta->tx_fragments++;
813 tx->sta->tx_bytes += tx->skb->len;
814 if (tx->extra_frag) {
815 tx->sta->tx_fragments += tx->num_extra_frag;
816 for (i = 0; i < tx->num_extra_frag; i++)
817 tx->sta->tx_bytes += tx->extra_frag[i]->len;
824 /* actual transmit path */
827 * deal with packet injection down monitor interface
828 * with Radiotap Header -- only called for monitor mode interface
830 static ieee80211_tx_result
831 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
835 * this is the moment to interpret and discard the radiotap header that
836 * must be at the start of the packet injected in Monitor mode
838 * Need to take some care with endian-ness since radiotap
839 * args are little-endian
842 struct ieee80211_radiotap_iterator iterator;
843 struct ieee80211_radiotap_header *rthdr =
844 (struct ieee80211_radiotap_header *) skb->data;
845 struct ieee80211_supported_band *sband;
846 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
847 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
849 sband = tx->local->hw.wiphy->bands[tx->channel->band];
851 skb->do_not_encrypt = 1;
852 info->flags |= IEEE80211_TX_CTL_INJECTED;
853 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
856 * for every radiotap entry that is present
857 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
858 * entries present, or -EINVAL on error)
864 ret = ieee80211_radiotap_iterator_next(&iterator);
869 /* see if this argument is something we can use */
870 switch (iterator.this_arg_index) {
872 * You must take care when dereferencing iterator.this_arg
873 * for multibyte types... the pointer is not aligned. Use
874 * get_unaligned((type *)iterator.this_arg) to dereference
875 * iterator.this_arg for type "type" safely on all arches.
877 case IEEE80211_RADIOTAP_RATE:
879 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
880 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
882 target_rate = (*iterator.this_arg) * 5;
883 for (i = 0; i < sband->n_bitrates; i++) {
884 struct ieee80211_rate *r;
886 r = &sband->bitrates[i];
888 if (r->bitrate == target_rate) {
895 case IEEE80211_RADIOTAP_ANTENNA:
897 * radiotap uses 0 for 1st ant, mac80211 is 1 for
900 info->antenna_sel_tx = (*iterator.this_arg) + 1;
904 case IEEE80211_RADIOTAP_DBM_TX_POWER:
905 control->power_level = *iterator.this_arg;
909 case IEEE80211_RADIOTAP_FLAGS:
910 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
912 * this indicates that the skb we have been
913 * handed has the 32-bit FCS CRC at the end...
914 * we should react to that by snipping it off
915 * because it will be recomputed and added
918 if (skb->len < (iterator.max_length + FCS_LEN))
921 skb_trim(skb, skb->len - FCS_LEN);
923 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
924 tx->skb->do_not_encrypt = 0;
925 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
926 tx->flags |= IEEE80211_TX_FRAGMENTED;
930 * Please update the file
931 * Documentation/networking/mac80211-injection.txt
932 * when parsing new fields here.
940 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
944 * remove the radiotap header
945 * iterator->max_length was sanity-checked against
946 * skb->len by iterator init
948 skb_pull(skb, iterator.max_length);
956 static ieee80211_tx_result
957 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
959 struct net_device *dev)
961 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
962 struct ieee80211_hdr *hdr;
963 struct ieee80211_sub_if_data *sdata;
964 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
968 memset(tx, 0, sizeof(*tx));
970 tx->dev = dev; /* use original interface */
972 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
973 tx->channel = local->hw.conf.channel;
975 tx->last_frag_rate_idx = -1;
977 * Set this flag (used below to indicate "automatic fragmentation"),
978 * it will be cleared/left by radiotap as desired.
980 tx->flags |= IEEE80211_TX_FRAGMENTED;
982 /* process and remove the injection radiotap header */
983 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
984 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
985 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
989 * __ieee80211_parse_tx_radiotap has now removed
990 * the radiotap header that was present and pre-filled
991 * 'tx' with tx control information.
995 hdr = (struct ieee80211_hdr *) skb->data;
997 tx->sta = sta_info_get(local, hdr->addr1);
999 if (is_multicast_ether_addr(hdr->addr1)) {
1000 tx->flags &= ~IEEE80211_TX_UNICAST;
1001 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1003 tx->flags |= IEEE80211_TX_UNICAST;
1004 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1007 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1008 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1009 skb->len + FCS_LEN > local->fragmentation_threshold &&
1010 !local->ops->set_frag_threshold &&
1011 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1012 tx->flags |= IEEE80211_TX_FRAGMENTED;
1014 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1018 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1019 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1020 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1022 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1023 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1024 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1025 tx->ethertype = (pos[0] << 8) | pos[1];
1027 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1033 * NB: @tx is uninitialised when passed in here
1035 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1036 struct sk_buff *skb,
1037 struct net_device *mdev)
1039 struct net_device *dev;
1041 dev = dev_get_by_index(&init_net, skb->iif);
1042 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1048 /* initialises tx with control */
1049 __ieee80211_tx_prepare(tx, skb, dev);
1054 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1055 struct ieee80211_tx_data *tx)
1057 struct ieee80211_tx_info *info;
1061 if (netif_subqueue_stopped(local->mdev, skb))
1062 return IEEE80211_TX_AGAIN;
1063 info = IEEE80211_SKB_CB(skb);
1065 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1066 "TX to low-level driver", skb);
1067 ret = local->ops->tx(local_to_hw(local), skb);
1069 return IEEE80211_TX_AGAIN;
1070 local->mdev->trans_start = jiffies;
1071 ieee80211_led_tx(local, 1);
1073 if (tx->extra_frag) {
1074 for (i = 0; i < tx->num_extra_frag; i++) {
1075 if (!tx->extra_frag[i])
1077 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1078 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1079 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1080 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1081 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1082 if (netif_subqueue_stopped(local->mdev,
1084 return IEEE80211_TX_FRAG_AGAIN;
1085 if (i == tx->num_extra_frag) {
1086 info->tx_rate_idx = tx->last_frag_rate_idx;
1088 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1090 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1093 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1096 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1097 "TX to low-level driver",
1099 ret = local->ops->tx(local_to_hw(local),
1102 return IEEE80211_TX_FRAG_AGAIN;
1103 local->mdev->trans_start = jiffies;
1104 ieee80211_led_tx(local, 1);
1105 tx->extra_frag[i] = NULL;
1107 kfree(tx->extra_frag);
1108 tx->extra_frag = NULL;
1110 return IEEE80211_TX_OK;
1114 * Invoke TX handlers, return 0 on success and non-zero if the
1115 * frame was dropped or queued.
1117 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1119 struct sk_buff *skb = tx->skb;
1120 ieee80211_tx_result res = TX_DROP;
1123 #define CALL_TXH(txh) \
1125 if (res != TX_CONTINUE) \
1128 CALL_TXH(ieee80211_tx_h_check_assoc)
1129 CALL_TXH(ieee80211_tx_h_ps_buf)
1130 CALL_TXH(ieee80211_tx_h_select_key)
1131 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1132 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1133 CALL_TXH(ieee80211_tx_h_misc)
1134 CALL_TXH(ieee80211_tx_h_sequence)
1135 CALL_TXH(ieee80211_tx_h_fragment)
1136 /* handlers after fragment must be aware of tx info fragmentation! */
1137 CALL_TXH(ieee80211_tx_h_encrypt)
1138 CALL_TXH(ieee80211_tx_h_calculate_duration)
1139 CALL_TXH(ieee80211_tx_h_stats)
1143 if (unlikely(res == TX_DROP)) {
1144 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1146 for (i = 0; i < tx->num_extra_frag; i++)
1147 if (tx->extra_frag[i])
1148 dev_kfree_skb(tx->extra_frag[i]);
1149 kfree(tx->extra_frag);
1151 } else if (unlikely(res == TX_QUEUED)) {
1152 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1159 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1161 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1162 struct sta_info *sta;
1163 struct ieee80211_tx_data tx;
1164 ieee80211_tx_result res_prepare;
1165 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1169 queue = skb_get_queue_mapping(skb);
1171 WARN_ON(test_bit(queue, local->queues_pending));
1173 if (unlikely(skb->len < 10)) {
1180 /* initialises tx */
1181 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1183 if (res_prepare == TX_DROP) {
1190 tx.channel = local->hw.conf.channel;
1191 info->band = tx.channel->band;
1193 if (invoke_tx_handlers(&tx))
1197 ret = __ieee80211_tx(local, skb, &tx);
1199 struct ieee80211_tx_stored_packet *store;
1202 * Since there are no fragmented frames on A-MPDU
1203 * queues, there's no reason for a driver to reject
1204 * a frame there, warn and drop it.
1206 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1209 store = &local->pending_packet[queue];
1211 if (ret == IEEE80211_TX_FRAG_AGAIN)
1214 set_bit(queue, local->queues_pending);
1217 * When the driver gets out of buffers during sending of
1218 * fragments and calls ieee80211_stop_queue, the netif
1219 * subqueue is stopped. There is, however, a small window
1220 * in which the PENDING bit is not yet set. If a buffer
1221 * gets available in that window (i.e. driver calls
1222 * ieee80211_wake_queue), we would end up with ieee80211_tx
1223 * called with the PENDING bit still set. Prevent this by
1224 * continuing transmitting here when that situation is
1225 * possible to have happened.
1227 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1228 clear_bit(queue, local->queues_pending);
1232 store->extra_frag = tx.extra_frag;
1233 store->num_extra_frag = tx.num_extra_frag;
1234 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1235 store->last_frag_rate_ctrl_probe =
1236 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1245 for (i = 0; i < tx.num_extra_frag; i++)
1246 if (tx.extra_frag[i])
1247 dev_kfree_skb(tx.extra_frag[i]);
1248 kfree(tx.extra_frag);
1253 /* device xmit handlers */
1255 static int ieee80211_skb_resize(struct ieee80211_local *local,
1256 struct sk_buff *skb,
1257 int head_need, bool may_encrypt)
1262 * This could be optimised, devices that do full hardware
1263 * crypto (including TKIP MMIC) need no tailroom... But we
1264 * have no drivers for such devices currently.
1267 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1268 tail_need -= skb_tailroom(skb);
1269 tail_need = max_t(int, tail_need, 0);
1272 if (head_need || tail_need) {
1273 /* Sorry. Can't account for this any more */
1277 if (skb_header_cloned(skb))
1278 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1280 I802_DEBUG_INC(local->tx_expand_skb_head);
1282 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1283 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1284 wiphy_name(local->hw.wiphy));
1288 /* update truesize too */
1289 skb->truesize += head_need + tail_need;
1294 int ieee80211_master_start_xmit(struct sk_buff *skb,
1295 struct net_device *dev)
1297 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1298 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1299 struct net_device *odev = NULL;
1300 struct ieee80211_sub_if_data *osdata;
1306 odev = dev_get_by_index(&init_net, skb->iif);
1307 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1311 if (unlikely(!odev)) {
1312 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1313 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1314 "originating device\n", dev->name);
1320 memset(info, 0, sizeof(*info));
1322 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1324 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1326 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1327 ieee80211_is_data(hdr->frame_control)) {
1328 if (ieee80211_is_data(hdr->frame_control)) {
1329 if (is_multicast_ether_addr(hdr->addr3))
1330 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1332 if (mesh_nexthop_lookup(skb, osdata))
1334 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1335 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1340 may_encrypt = !skb->do_not_encrypt;
1342 headroom = osdata->local->tx_headroom;
1344 headroom += IEEE80211_ENCRYPT_HEADROOM;
1345 headroom -= skb_headroom(skb);
1346 headroom = max_t(int, 0, headroom);
1348 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1354 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1355 osdata = container_of(osdata->bss,
1356 struct ieee80211_sub_if_data,
1358 info->control.vif = &osdata->vif;
1359 ret = ieee80211_tx(odev, skb);
1365 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1366 struct net_device *dev)
1368 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1369 struct ieee80211_radiotap_header *prthdr =
1370 (struct ieee80211_radiotap_header *)skb->data;
1373 /* check for not even having the fixed radiotap header part */
1374 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1375 goto fail; /* too short to be possibly valid */
1377 /* is it a header version we can trust to find length from? */
1378 if (unlikely(prthdr->it_version))
1379 goto fail; /* only version 0 is supported */
1381 /* then there must be a radiotap header with a length we can use */
1382 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1384 /* does the skb contain enough to deliver on the alleged length? */
1385 if (unlikely(skb->len < len_rthdr))
1386 goto fail; /* skb too short for claimed rt header extent */
1388 skb->dev = local->mdev;
1390 /* needed because we set skb device to master */
1391 skb->iif = dev->ifindex;
1393 /* sometimes we do encrypt injected frames, will be fixed
1394 * up in radiotap parser if not wanted */
1395 skb->do_not_encrypt = 0;
1398 * fix up the pointers accounting for the radiotap
1399 * header still being in there. We are being given
1400 * a precooked IEEE80211 header so no need for
1403 skb_set_mac_header(skb, len_rthdr);
1405 * these are just fixed to the end of the rt area since we
1406 * don't have any better information and at this point, nobody cares
1408 skb_set_network_header(skb, len_rthdr);
1409 skb_set_transport_header(skb, len_rthdr);
1411 /* pass the radiotap header up to the next stage intact */
1412 dev_queue_xmit(skb);
1413 return NETDEV_TX_OK;
1417 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1421 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1422 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1423 * @skb: packet to be sent
1424 * @dev: incoming interface
1426 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1427 * not be freed, and caller is responsible for either retrying later or freeing
1430 * This function takes in an Ethernet header and encapsulates it with suitable
1431 * IEEE 802.11 header based on which interface the packet is coming in. The
1432 * encapsulated packet will then be passed to master interface, wlan#.11, for
1433 * transmission (through low-level driver).
1435 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1436 struct net_device *dev)
1438 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1439 struct ieee80211_sub_if_data *sdata;
1440 int ret = 1, head_need;
1441 u16 ethertype, hdrlen, meshhdrlen = 0;
1443 struct ieee80211_hdr hdr;
1444 struct ieee80211s_hdr mesh_hdr;
1445 const u8 *encaps_data;
1446 int encaps_len, skip_header_bytes;
1448 struct sta_info *sta;
1451 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1452 if (unlikely(skb->len < ETH_HLEN)) {
1457 nh_pos = skb_network_header(skb) - skb->data;
1458 h_pos = skb_transport_header(skb) - skb->data;
1460 /* convert Ethernet header to proper 802.11 header (based on
1461 * operation mode) */
1462 ethertype = (skb->data[12] << 8) | skb->data[13];
1463 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1465 switch (sdata->vif.type) {
1466 case NL80211_IFTYPE_AP:
1467 case NL80211_IFTYPE_AP_VLAN:
1468 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1470 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1471 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1472 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1475 case NL80211_IFTYPE_WDS:
1476 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1478 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1479 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1480 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1481 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1484 #ifdef CONFIG_MAC80211_MESH
1485 case NL80211_IFTYPE_MESH_POINT:
1486 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1488 memset(hdr.addr1, 0, ETH_ALEN);
1489 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1490 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1491 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1492 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1493 /* Do not send frames with mesh_ttl == 0 */
1494 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1498 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1502 case NL80211_IFTYPE_STATION:
1503 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1505 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1506 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1507 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1510 case NL80211_IFTYPE_ADHOC:
1512 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1513 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1514 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1523 * There's no need to try to look up the destination
1524 * if it is a multicast address (which can only happen
1527 if (!is_multicast_ether_addr(hdr.addr1)) {
1529 sta = sta_info_get(local, hdr.addr1);
1531 sta_flags = get_sta_flags(sta);
1535 /* receiver and we are QoS enabled, use a QoS type frame */
1536 if (sta_flags & WLAN_STA_WME &&
1537 ieee80211_num_regular_queues(&local->hw) >= 4) {
1538 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1543 * Drop unicast frames to unauthorised stations unless they are
1544 * EAPOL frames from the local station.
1546 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1547 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1548 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1549 !(ethertype == ETH_P_PAE &&
1550 compare_ether_addr(dev->dev_addr,
1551 skb->data + ETH_ALEN) == 0))) {
1552 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1553 DECLARE_MAC_BUF(mac);
1555 if (net_ratelimit())
1556 printk(KERN_DEBUG "%s: dropped frame to %s"
1557 " (unauthorized port)\n", dev->name,
1558 print_mac(mac, hdr.addr1));
1561 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1567 hdr.frame_control = fc;
1568 hdr.duration_id = 0;
1571 skip_header_bytes = ETH_HLEN;
1572 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1573 encaps_data = bridge_tunnel_header;
1574 encaps_len = sizeof(bridge_tunnel_header);
1575 skip_header_bytes -= 2;
1576 } else if (ethertype >= 0x600) {
1577 encaps_data = rfc1042_header;
1578 encaps_len = sizeof(rfc1042_header);
1579 skip_header_bytes -= 2;
1585 skb_pull(skb, skip_header_bytes);
1586 nh_pos -= skip_header_bytes;
1587 h_pos -= skip_header_bytes;
1589 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1592 * So we need to modify the skb header and hence need a copy of
1593 * that. The head_need variable above doesn't, so far, include
1594 * the needed header space that we don't need right away. If we
1595 * can, then we don't reallocate right now but only after the
1596 * frame arrives at the master device (if it does...)
1598 * If we cannot, however, then we will reallocate to include all
1599 * the ever needed space. Also, if we need to reallocate it anyway,
1600 * make it big enough for everything we may ever need.
1603 if (head_need > 0 || skb_cloned(skb)) {
1604 head_need += IEEE80211_ENCRYPT_HEADROOM;
1605 head_need += local->tx_headroom;
1606 head_need = max_t(int, 0, head_need);
1607 if (ieee80211_skb_resize(local, skb, head_need, true))
1612 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1613 nh_pos += encaps_len;
1614 h_pos += encaps_len;
1617 if (meshhdrlen > 0) {
1618 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1619 nh_pos += meshhdrlen;
1620 h_pos += meshhdrlen;
1623 if (ieee80211_is_data_qos(fc)) {
1624 __le16 *qos_control;
1626 qos_control = (__le16*) skb_push(skb, 2);
1627 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1629 * Maybe we could actually set some fields here, for now just
1630 * initialise to zero to indicate no special operation.
1634 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1639 skb->iif = dev->ifindex;
1641 skb->dev = local->mdev;
1642 dev->stats.tx_packets++;
1643 dev->stats.tx_bytes += skb->len;
1645 /* Update skb pointers to various headers since this modified frame
1646 * is going to go through Linux networking code that may potentially
1647 * need things like pointer to IP header. */
1648 skb_set_mac_header(skb, 0);
1649 skb_set_network_header(skb, nh_pos);
1650 skb_set_transport_header(skb, h_pos);
1652 dev->trans_start = jiffies;
1653 dev_queue_xmit(skb);
1666 * ieee80211_clear_tx_pending may not be called in a context where
1667 * it is possible that it packets could come in again.
1669 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1672 struct ieee80211_tx_stored_packet *store;
1674 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1675 if (!test_bit(i, local->queues_pending))
1677 store = &local->pending_packet[i];
1678 kfree_skb(store->skb);
1679 for (j = 0; j < store->num_extra_frag; j++)
1680 kfree_skb(store->extra_frag[j]);
1681 kfree(store->extra_frag);
1682 clear_bit(i, local->queues_pending);
1687 * Transmit all pending packets. Called from tasklet, locks master device
1688 * TX lock so that no new packets can come in.
1690 void ieee80211_tx_pending(unsigned long data)
1692 struct ieee80211_local *local = (struct ieee80211_local *)data;
1693 struct net_device *dev = local->mdev;
1694 struct ieee80211_tx_stored_packet *store;
1695 struct ieee80211_tx_data tx;
1698 netif_tx_lock_bh(dev);
1699 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1700 /* Check that this queue is ok */
1701 if (__netif_subqueue_stopped(local->mdev, i) &&
1702 !test_bit(i, local->queues_pending_run))
1705 if (!test_bit(i, local->queues_pending)) {
1706 clear_bit(i, local->queues_pending_run);
1707 ieee80211_wake_queue(&local->hw, i);
1711 clear_bit(i, local->queues_pending_run);
1712 netif_start_subqueue(local->mdev, i);
1714 store = &local->pending_packet[i];
1715 tx.extra_frag = store->extra_frag;
1716 tx.num_extra_frag = store->num_extra_frag;
1717 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1719 if (store->last_frag_rate_ctrl_probe)
1720 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1721 ret = __ieee80211_tx(local, store->skb, &tx);
1723 if (ret == IEEE80211_TX_FRAG_AGAIN)
1726 clear_bit(i, local->queues_pending);
1727 ieee80211_wake_queue(&local->hw, i);
1730 netif_tx_unlock_bh(dev);
1733 /* functions for drivers to get certain frames */
1735 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1736 struct ieee80211_if_ap *bss,
1737 struct sk_buff *skb,
1738 struct beacon_data *beacon)
1742 int i, have_bits = 0, n1, n2;
1744 /* Generate bitmap for TIM only if there are any STAs in power save
1746 if (atomic_read(&bss->num_sta_ps) > 0)
1747 /* in the hope that this is faster than
1748 * checking byte-for-byte */
1749 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1750 IEEE80211_MAX_AID+1);
1752 if (bss->dtim_count == 0)
1753 bss->dtim_count = beacon->dtim_period - 1;
1757 tim = pos = (u8 *) skb_put(skb, 6);
1758 *pos++ = WLAN_EID_TIM;
1760 *pos++ = bss->dtim_count;
1761 *pos++ = beacon->dtim_period;
1763 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1767 /* Find largest even number N1 so that bits numbered 1 through
1768 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1769 * (N2 + 1) x 8 through 2007 are 0. */
1771 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1778 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1785 /* Bitmap control */
1787 /* Part Virt Bitmap */
1788 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1790 tim[1] = n2 - n1 + 4;
1791 skb_put(skb, n2 - n1);
1793 *pos++ = aid0; /* Bitmap control */
1794 *pos++ = 0; /* Part Virt Bitmap */
1798 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1799 struct ieee80211_vif *vif)
1801 struct ieee80211_local *local = hw_to_local(hw);
1802 struct sk_buff *skb = NULL;
1803 struct ieee80211_tx_info *info;
1804 struct net_device *bdev;
1805 struct ieee80211_sub_if_data *sdata = NULL;
1806 struct ieee80211_if_ap *ap = NULL;
1807 struct ieee80211_if_sta *ifsta = NULL;
1808 struct rate_selection rsel;
1809 struct beacon_data *beacon;
1810 struct ieee80211_supported_band *sband;
1812 enum ieee80211_band band = local->hw.conf.channel->band;
1814 sband = local->hw.wiphy->bands[band];
1818 sdata = vif_to_sdata(vif);
1821 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1823 beacon = rcu_dereference(ap->beacon);
1826 * headroom, head length,
1827 * tail length and maximum TIM length
1829 skb = dev_alloc_skb(local->tx_headroom +
1831 beacon->tail_len + 256);
1835 skb_reserve(skb, local->tx_headroom);
1836 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1840 * Not very nice, but we want to allow the driver to call
1841 * ieee80211_beacon_get() as a response to the set_tim()
1842 * callback. That, however, is already invoked under the
1843 * sta_lock to guarantee consistent and race-free update
1844 * of the tim bitmap in mac80211 and the driver.
1846 if (local->tim_in_locked_section) {
1847 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1849 unsigned long flags;
1851 spin_lock_irqsave(&local->sta_lock, flags);
1852 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1853 spin_unlock_irqrestore(&local->sta_lock, flags);
1857 memcpy(skb_put(skb, beacon->tail_len),
1858 beacon->tail, beacon->tail_len);
1860 num_beacons = &ap->num_beacons;
1863 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1864 struct ieee80211_hdr *hdr;
1865 ifsta = &sdata->u.sta;
1867 if (!ifsta->probe_resp)
1870 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1874 hdr = (struct ieee80211_hdr *) skb->data;
1875 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1876 IEEE80211_STYPE_BEACON);
1878 num_beacons = &ifsta->num_beacons;
1879 #ifdef CONFIG_MAC80211_MESH
1880 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1881 struct ieee80211_mgmt *mgmt;
1884 /* headroom, head length, tail length and maximum TIM length */
1885 skb = dev_alloc_skb(local->tx_headroom + 400);
1889 skb_reserve(skb, local->hw.extra_tx_headroom);
1890 mgmt = (struct ieee80211_mgmt *)
1891 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1892 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1893 mgmt->frame_control =
1894 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1895 memset(mgmt->da, 0xff, ETH_ALEN);
1896 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1897 /* BSSID is left zeroed, wildcard value */
1898 mgmt->u.beacon.beacon_int =
1899 cpu_to_le16(local->hw.conf.beacon_int);
1900 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1902 pos = skb_put(skb, 2);
1903 *pos++ = WLAN_EID_SSID;
1906 mesh_mgmt_ies_add(skb, sdata);
1908 num_beacons = &sdata->u.mesh.num_beacons;
1915 info = IEEE80211_SKB_CB(skb);
1917 skb->do_not_encrypt = 1;
1920 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1922 if (unlikely(rsel.rate_idx < 0)) {
1923 if (net_ratelimit()) {
1924 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1926 wiphy_name(local->hw.wiphy));
1928 dev_kfree_skb_any(skb);
1933 info->control.vif = vif;
1934 info->tx_rate_idx = rsel.rate_idx;
1936 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1937 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1938 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
1939 if (sdata->bss_conf.use_short_preamble &&
1940 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1941 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1943 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1944 info->control.retry_limit = 1;
1951 EXPORT_SYMBOL(ieee80211_beacon_get);
1953 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1954 const void *frame, size_t frame_len,
1955 const struct ieee80211_tx_info *frame_txctl,
1956 struct ieee80211_rts *rts)
1958 const struct ieee80211_hdr *hdr = frame;
1960 rts->frame_control =
1961 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
1962 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1964 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1965 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1967 EXPORT_SYMBOL(ieee80211_rts_get);
1969 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1970 const void *frame, size_t frame_len,
1971 const struct ieee80211_tx_info *frame_txctl,
1972 struct ieee80211_cts *cts)
1974 const struct ieee80211_hdr *hdr = frame;
1976 cts->frame_control =
1977 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
1978 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1979 frame_len, frame_txctl);
1980 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1982 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1985 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1986 struct ieee80211_vif *vif)
1988 struct ieee80211_local *local = hw_to_local(hw);
1989 struct sk_buff *skb = NULL;
1990 struct sta_info *sta;
1991 struct ieee80211_tx_data tx;
1992 struct net_device *bdev;
1993 struct ieee80211_sub_if_data *sdata;
1994 struct ieee80211_if_ap *bss = NULL;
1995 struct beacon_data *beacon;
1996 struct ieee80211_tx_info *info;
1998 sdata = vif_to_sdata(vif);
2006 beacon = rcu_dereference(bss->beacon);
2008 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2011 if (bss->dtim_count != 0)
2012 goto out; /* send buffered bc/mc only after DTIM beacon */
2015 skb = skb_dequeue(&bss->ps_bc_buf);
2018 local->total_ps_buffered--;
2020 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2021 struct ieee80211_hdr *hdr =
2022 (struct ieee80211_hdr *) skb->data;
2023 /* more buffered multicast/broadcast frames ==> set
2024 * MoreData flag in IEEE 802.11 header to inform PS
2026 hdr->frame_control |=
2027 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2030 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2032 dev_kfree_skb_any(skb);
2035 info = IEEE80211_SKB_CB(skb);
2038 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2039 tx.channel = local->hw.conf.channel;
2040 info->band = tx.channel->band;
2042 if (invoke_tx_handlers(&tx))
2049 EXPORT_SYMBOL(ieee80211_get_buffered_bc);