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 <net/ieee80211_radiotap.h>
21 #include <net/cfg80211.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "ieee80211_led.h"
30 #include "ieee80211_rate.h"
32 #define IEEE80211_TX_OK 0
33 #define IEEE80211_TX_AGAIN 1
34 #define IEEE80211_TX_FRAG_AGAIN 2
38 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
39 struct ieee80211_hdr *hdr)
41 /* Set the sequence number for this frame. */
42 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
44 /* Increase the sequence number. */
45 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
48 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
49 static void ieee80211_dump_frame(const char *ifname, const char *title,
50 const struct sk_buff *skb)
52 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
56 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
62 fc = le16_to_cpu(hdr->frame_control);
63 hdrlen = ieee80211_get_hdrlen(fc);
64 if (hdrlen > skb->len)
67 printk(" FC=0x%04x DUR=0x%04x",
68 fc, le16_to_cpu(hdr->duration_id));
70 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
72 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
74 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
76 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
79 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
80 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
84 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
86 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
89 int rate, mrate, erp, dur, i;
90 struct ieee80211_rate *txrate = tx->u.tx.rate;
91 struct ieee80211_local *local = tx->local;
92 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
94 erp = txrate->flags & IEEE80211_RATE_ERP;
97 * data and mgmt (except PS Poll):
99 * - during contention period:
100 * if addr1 is group address: 0
101 * if more fragments = 0 and addr1 is individual address: time to
102 * transmit one ACK plus SIFS
103 * if more fragments = 1 and addr1 is individual address: time to
104 * transmit next fragment plus 2 x ACK plus 3 x SIFS
107 * - control response frame (CTS or ACK) shall be transmitted using the
108 * same rate as the immediately previous frame in the frame exchange
109 * sequence, if this rate belongs to the PHY mandatory rates, or else
110 * at the highest possible rate belonging to the PHY rates in the
114 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
115 /* TODO: These control frames are not currently sent by
116 * 80211.o, but should they be implemented, this function
117 * needs to be updated to support duration field calculation.
119 * RTS: time needed to transmit pending data/mgmt frame plus
120 * one CTS frame plus one ACK frame plus 3 x SIFS
121 * CTS: duration of immediately previous RTS minus time
122 * required to transmit CTS and its SIFS
123 * ACK: 0 if immediately previous directed data/mgmt had
124 * more=0, with more=1 duration in ACK frame is duration
125 * from previous frame minus time needed to transmit ACK
127 * PS Poll: BIT(15) | BIT(14) | aid
133 if (0 /* FIX: data/mgmt during CFP */)
136 if (group_addr) /* Group address as the destination - no ACK */
139 /* Individual destination address:
140 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
141 * CTS and ACK frames shall be transmitted using the highest rate in
142 * basic rate set that is less than or equal to the rate of the
143 * immediately previous frame and that is using the same modulation
144 * (CCK or OFDM). If no basic rate set matches with these requirements,
145 * the highest mandatory rate of the PHY that is less than or equal to
146 * the rate of the previous frame is used.
147 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
150 mrate = 10; /* use 1 Mbps if everything fails */
151 for (i = 0; i < mode->num_rates; i++) {
152 struct ieee80211_rate *r = &mode->rates[i];
153 if (r->rate > txrate->rate)
156 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
157 IEEE80211_RATE_MODULATION(r->flags))
160 if (r->flags & IEEE80211_RATE_BASIC)
162 else if (r->flags & IEEE80211_RATE_MANDATORY)
166 /* No matching basic rate found; use highest suitable mandatory
171 /* Time needed to transmit ACK
172 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
173 * to closest integer */
175 dur = ieee80211_frame_duration(local, 10, rate, erp,
176 tx->sdata->short_preamble);
179 /* Frame is fragmented: duration increases with time needed to
180 * transmit next fragment plus ACK and 2 x SIFS. */
181 dur *= 2; /* ACK + SIFS */
183 dur += ieee80211_frame_duration(local, next_frag_len,
185 tx->sdata->short_preamble);
191 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
194 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
197 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
200 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
203 static int inline is_ieee80211_device(struct net_device *dev,
204 struct net_device *master)
206 return (wdev_priv(dev->ieee80211_ptr) ==
207 wdev_priv(master->ieee80211_ptr));
212 static ieee80211_txrx_result
213 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
215 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
216 struct sk_buff *skb = tx->skb;
217 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
218 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
221 if (unlikely(tx->local->sta_scanning != 0) &&
222 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
223 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
226 if (tx->u.tx.ps_buffered)
227 return TXRX_CONTINUE;
229 sta_flags = tx->sta ? tx->sta->flags : 0;
231 if (likely(tx->u.tx.unicast)) {
232 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
233 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
234 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
236 printk(KERN_DEBUG "%s: dropped data frame to not "
237 "associated station " MAC_FMT "\n",
238 tx->dev->name, MAC_ARG(hdr->addr1));
239 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
240 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
244 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
245 tx->local->num_sta == 0 &&
246 !tx->local->allow_broadcast_always &&
247 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
249 * No associated STAs - no need to send multicast
254 return TXRX_CONTINUE;
257 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
258 !(sta_flags & WLAN_STA_AUTHORIZED))) {
259 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
260 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
261 " (unauthorized port)\n", tx->dev->name,
262 MAC_ARG(hdr->addr1));
264 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
268 return TXRX_CONTINUE;
271 static ieee80211_txrx_result
272 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
276 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
277 ieee80211_include_sequence(tx->sdata, hdr);
279 return TXRX_CONTINUE;
282 /* This function is called whenever the AP is about to exceed the maximum limit
283 * of buffered frames for power saving STAs. This situation should not really
284 * happen often during normal operation, so dropping the oldest buffered packet
285 * from each queue should be OK to make some room for new frames. */
286 static void purge_old_ps_buffers(struct ieee80211_local *local)
288 int total = 0, purged = 0;
290 struct ieee80211_sub_if_data *sdata;
291 struct sta_info *sta;
293 read_lock(&local->sub_if_lock);
294 list_for_each_entry(sdata, &local->sub_if_list, list) {
295 struct ieee80211_if_ap *ap;
296 if (sdata->dev == local->mdev ||
297 sdata->type != IEEE80211_IF_TYPE_AP)
300 skb = skb_dequeue(&ap->ps_bc_buf);
305 total += skb_queue_len(&ap->ps_bc_buf);
307 read_unlock(&local->sub_if_lock);
309 read_lock_bh(&local->sta_lock);
310 list_for_each_entry(sta, &local->sta_list, list) {
311 skb = skb_dequeue(&sta->ps_tx_buf);
316 total += skb_queue_len(&sta->ps_tx_buf);
318 read_unlock_bh(&local->sta_lock);
320 local->total_ps_buffered = total;
321 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
322 local->mdev->name, purged);
325 static inline ieee80211_txrx_result
326 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
328 /* broadcast/multicast frame */
329 /* If any of the associated stations is in power save mode,
330 * the frame is buffered to be sent after DTIM beacon frame */
331 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
332 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
333 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
334 !(tx->fc & IEEE80211_FCTL_ORDER)) {
335 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
336 purge_old_ps_buffers(tx->local);
337 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
339 if (net_ratelimit()) {
340 printk(KERN_DEBUG "%s: BC TX buffer full - "
341 "dropping the oldest frame\n",
344 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
346 tx->local->total_ps_buffered++;
347 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
351 return TXRX_CONTINUE;
354 static inline ieee80211_txrx_result
355 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
357 struct sta_info *sta = tx->sta;
360 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
361 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
362 return TXRX_CONTINUE;
364 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
365 struct ieee80211_tx_packet_data *pkt_data;
366 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
367 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
369 MAC_ARG(sta->addr), sta->aid,
370 skb_queue_len(&sta->ps_tx_buf));
371 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
372 sta->flags |= WLAN_STA_TIM;
373 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
374 purge_old_ps_buffers(tx->local);
375 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
376 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
377 if (net_ratelimit()) {
378 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
379 "buffer full - dropping oldest frame\n",
380 tx->dev->name, MAC_ARG(sta->addr));
384 tx->local->total_ps_buffered++;
385 /* Queue frame to be sent after STA sends an PS Poll frame */
386 if (skb_queue_empty(&sta->ps_tx_buf)) {
387 if (tx->local->ops->set_tim)
388 tx->local->ops->set_tim(local_to_hw(tx->local),
391 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
393 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
394 pkt_data->jiffies = jiffies;
395 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
398 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
399 else if (unlikely(sta->flags & WLAN_STA_PS)) {
400 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
401 "set -> send frame\n", tx->dev->name,
404 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
407 return TXRX_CONTINUE;
411 static ieee80211_txrx_result
412 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
414 if (unlikely(tx->u.tx.ps_buffered))
415 return TXRX_CONTINUE;
417 if (tx->u.tx.unicast)
418 return ieee80211_tx_h_unicast_ps_buf(tx);
420 return ieee80211_tx_h_multicast_ps_buf(tx);
426 static ieee80211_txrx_result
427 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
430 tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
432 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
434 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
436 else if (tx->sta && tx->sta->key)
437 tx->key = tx->sta->key;
438 else if (tx->sdata->default_key)
439 tx->key = tx->sdata->default_key;
440 else if (tx->sdata->drop_unencrypted &&
441 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
442 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
448 tx->key->tx_rx_count++;
449 if (unlikely(tx->local->key_tx_rx_threshold &&
450 tx->key->tx_rx_count >
451 tx->local->key_tx_rx_threshold)) {
452 ieee80211_key_threshold_notify(tx->dev, tx->key,
457 return TXRX_CONTINUE;
460 static ieee80211_txrx_result
461 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
463 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
464 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
465 struct sk_buff **frags, *first, *frag;
469 int frag_threshold = tx->local->fragmentation_threshold;
472 return TXRX_CONTINUE;
476 hdrlen = ieee80211_get_hdrlen(tx->fc);
477 payload_len = first->len - hdrlen;
478 per_fragm = frag_threshold - hdrlen - FCS_LEN;
479 num_fragm = (payload_len + per_fragm - 1) / per_fragm;
481 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
485 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
486 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
487 pos = first->data + hdrlen + per_fragm;
488 left = payload_len - per_fragm;
489 for (i = 0; i < num_fragm - 1; i++) {
490 struct ieee80211_hdr *fhdr;
496 /* reserve enough extra head and tail room for possible
499 dev_alloc_skb(tx->local->tx_headroom +
501 IEEE80211_ENCRYPT_HEADROOM +
502 IEEE80211_ENCRYPT_TAILROOM);
505 /* Make sure that all fragments use the same priority so
506 * that they end up using the same TX queue */
507 frag->priority = first->priority;
508 skb_reserve(frag, tx->local->tx_headroom +
509 IEEE80211_ENCRYPT_HEADROOM);
510 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
511 memcpy(fhdr, first->data, hdrlen);
512 if (i == num_fragm - 2)
513 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
514 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
515 copylen = left > per_fragm ? per_fragm : left;
516 memcpy(skb_put(frag, copylen), pos, copylen);
521 skb_trim(first, hdrlen + per_fragm);
523 tx->u.tx.num_extra_frag = num_fragm - 1;
524 tx->u.tx.extra_frag = frags;
526 return TXRX_CONTINUE;
529 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
531 for (i = 0; i < num_fragm - 1; i++)
533 dev_kfree_skb(frags[i]);
536 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
540 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
542 if (tx->key->force_sw_encrypt) {
543 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
546 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
547 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
548 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
556 static ieee80211_txrx_result
557 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
559 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
562 fc = le16_to_cpu(hdr->frame_control);
564 if (!tx->key || tx->key->alg != ALG_WEP ||
565 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
566 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
567 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
568 return TXRX_CONTINUE;
570 tx->u.tx.control->iv_len = WEP_IV_LEN;
571 tx->u.tx.control->icv_len = WEP_ICV_LEN;
572 ieee80211_tx_set_iswep(tx);
574 if (wep_encrypt_skb(tx, tx->skb) < 0) {
575 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
579 if (tx->u.tx.extra_frag) {
581 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
582 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
583 I802_DEBUG_INC(tx->local->
584 tx_handlers_drop_wep);
590 return TXRX_CONTINUE;
593 static ieee80211_txrx_result
594 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
596 struct rate_control_extra extra;
598 memset(&extra, 0, sizeof(extra));
599 extra.mode = tx->u.tx.mode;
600 extra.mgmt_data = tx->sdata &&
601 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
602 extra.ethertype = tx->ethertype;
604 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
606 if (unlikely(extra.probe != NULL)) {
607 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
608 tx->u.tx.probe_last_frag = 1;
609 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
610 tx->u.tx.rate = extra.probe;
612 tx->u.tx.control->alt_retry_rate = -1;
616 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
617 tx->sdata->use_protection && tx->fragmented &&
619 tx->u.tx.last_frag_rate = tx->u.tx.rate;
620 tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
622 tx->u.tx.rate = extra.nonerp;
623 tx->u.tx.control->rate = extra.nonerp;
624 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
626 tx->u.tx.last_frag_rate = tx->u.tx.rate;
627 tx->u.tx.control->rate = tx->u.tx.rate;
629 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
631 return TXRX_CONTINUE;
634 static ieee80211_txrx_result
635 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
637 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
638 u16 fc = le16_to_cpu(hdr->frame_control);
640 struct ieee80211_tx_control *control = tx->u.tx.control;
641 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
643 if (!is_multicast_ether_addr(hdr->addr1)) {
644 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
645 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
646 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
647 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
648 control->retry_limit =
649 tx->local->long_retry_limit;
651 control->retry_limit =
652 tx->local->short_retry_limit;
655 control->retry_limit = 1;
658 if (tx->fragmented) {
659 /* Do not use multiple retry rates when sending fragmented
661 * TODO: The last fragment could still use multiple retry
663 control->alt_retry_rate = -1;
666 /* Use CTS protection for unicast frames sent using extended rates if
667 * there are associated non-ERP stations and RTS/CTS is not configured
669 if (mode->mode == MODE_IEEE80211G &&
670 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
671 tx->u.tx.unicast && tx->sdata->use_protection &&
672 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
673 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
675 /* Transmit data frames using short preambles if the driver supports
676 * short preambles at the selected rate and short preambles are
677 * available on the network at the current point in time. */
678 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
679 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
680 tx->sdata->short_preamble &&
681 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
682 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
685 /* Setup duration field for the first fragment of the frame. Duration
686 * for remaining fragments will be updated when they are being sent
687 * to low-level driver in ieee80211_tx(). */
688 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
689 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
691 hdr->duration_id = cpu_to_le16(dur);
693 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
694 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
695 struct ieee80211_rate *rate;
697 /* Do not use multiple retry rates when using RTS/CTS */
698 control->alt_retry_rate = -1;
700 /* Use min(data rate, max base rate) as CTS/RTS rate */
701 rate = tx->u.tx.rate;
702 while (rate > mode->rates &&
703 !(rate->flags & IEEE80211_RATE_BASIC))
706 control->rts_cts_rate = rate->val;
707 control->rts_rate = rate;
711 tx->sta->tx_packets++;
712 tx->sta->tx_fragments++;
713 tx->sta->tx_bytes += tx->skb->len;
714 if (tx->u.tx.extra_frag) {
716 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
717 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
719 tx->u.tx.extra_frag[i]->len;
724 return TXRX_CONTINUE;
727 static ieee80211_txrx_result
728 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
730 struct ieee80211_local *local = tx->local;
731 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
732 struct sk_buff *skb = tx->skb;
733 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
734 u32 load = 0, hdrtime;
736 /* TODO: this could be part of tx_status handling, so that the number
737 * of retries would be known; TX rate should in that case be stored
738 * somewhere with the packet */
740 /* Estimate total channel use caused by this frame */
742 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
743 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
745 if (mode->mode == MODE_IEEE80211A ||
746 mode->mode == MODE_ATHEROS_TURBO ||
747 mode->mode == MODE_ATHEROS_TURBOG ||
748 (mode->mode == MODE_IEEE80211G &&
749 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
750 hdrtime = CHAN_UTIL_HDR_SHORT;
752 hdrtime = CHAN_UTIL_HDR_LONG;
755 if (!is_multicast_ether_addr(hdr->addr1))
758 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
760 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
763 load += skb->len * tx->u.tx.rate->rate_inv;
765 if (tx->u.tx.extra_frag) {
767 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
769 load += tx->u.tx.extra_frag[i]->len *
774 /* Divide channel_use by 8 to avoid wrapping around the counter */
775 load >>= CHAN_UTIL_SHIFT;
776 local->channel_use_raw += load;
778 tx->sta->channel_use_raw += load;
779 tx->sdata->channel_use_raw += load;
781 return TXRX_CONTINUE;
784 /* TODO: implement register/unregister functions for adding TX/RX handlers
785 * into ordered list */
787 ieee80211_tx_handler ieee80211_tx_handlers[] =
789 ieee80211_tx_h_check_assoc,
790 ieee80211_tx_h_sequence,
791 ieee80211_tx_h_ps_buf,
792 ieee80211_tx_h_select_key,
793 ieee80211_tx_h_michael_mic_add,
794 ieee80211_tx_h_fragment,
795 ieee80211_tx_h_tkip_encrypt,
796 ieee80211_tx_h_ccmp_encrypt,
797 ieee80211_tx_h_wep_encrypt,
798 ieee80211_tx_h_rate_ctrl,
800 ieee80211_tx_h_load_stats,
804 /* actual transmit path */
807 * deal with packet injection down monitor interface
808 * with Radiotap Header -- only called for monitor mode interface
810 static ieee80211_txrx_result
811 __ieee80211_parse_tx_radiotap(
812 struct ieee80211_txrx_data *tx,
813 struct sk_buff *skb, struct ieee80211_tx_control *control)
816 * this is the moment to interpret and discard the radiotap header that
817 * must be at the start of the packet injected in Monitor mode
819 * Need to take some care with endian-ness since radiotap
820 * args are little-endian
823 struct ieee80211_radiotap_iterator iterator;
824 struct ieee80211_radiotap_header *rthdr =
825 (struct ieee80211_radiotap_header *) skb->data;
826 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
827 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
830 * default control situation for all injected packets
831 * FIXME: this does not suit all usage cases, expand to allow control
834 control->retry_limit = 1; /* no retry */
835 control->key_idx = -1; /* no encryption key */
836 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
837 IEEE80211_TXCTL_USE_CTS_PROTECT);
838 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
839 IEEE80211_TXCTL_NO_ACK;
840 control->antenna_sel_tx = 0; /* default to default antenna */
843 * for every radiotap entry that is present
844 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
845 * entries present, or -EINVAL on error)
851 ret = ieee80211_radiotap_iterator_next(&iterator);
856 /* see if this argument is something we can use */
857 switch (iterator.this_arg_index) {
859 * You must take care when dereferencing iterator.this_arg
860 * for multibyte types... the pointer is not aligned. Use
861 * get_unaligned((type *)iterator.this_arg) to dereference
862 * iterator.this_arg for type "type" safely on all arches.
864 case IEEE80211_RADIOTAP_RATE:
866 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
867 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
869 target_rate = (*iterator.this_arg) * 5;
870 for (i = 0; i < mode->num_rates; i++) {
871 struct ieee80211_rate *r = &mode->rates[i];
873 if (r->rate > target_rate)
878 if (r->flags & IEEE80211_RATE_PREAMBLE2)
879 control->tx_rate = r->val2;
881 control->tx_rate = r->val;
883 /* end on exact match */
884 if (r->rate == target_rate)
889 case IEEE80211_RADIOTAP_ANTENNA:
891 * radiotap uses 0 for 1st ant, mac80211 is 1 for
894 control->antenna_sel_tx = (*iterator.this_arg) + 1;
897 case IEEE80211_RADIOTAP_DBM_TX_POWER:
898 control->power_level = *iterator.this_arg;
901 case IEEE80211_RADIOTAP_FLAGS:
902 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
904 * this indicates that the skb we have been
905 * handed has the 32-bit FCS CRC at the end...
906 * we should react to that by snipping it off
907 * because it will be recomputed and added
910 if (skb->len < (iterator.max_length + FCS_LEN))
913 skb_trim(skb, skb->len - FCS_LEN);
922 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
926 * remove the radiotap header
927 * iterator->max_length was sanity-checked against
928 * skb->len by iterator init
930 skb_pull(skb, iterator.max_length);
932 return TXRX_CONTINUE;
935 static ieee80211_txrx_result inline
936 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
938 struct net_device *dev,
939 struct ieee80211_tx_control *control)
941 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
942 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
943 struct ieee80211_sub_if_data *sdata;
944 ieee80211_txrx_result res = TXRX_CONTINUE;
948 memset(tx, 0, sizeof(*tx));
950 tx->dev = dev; /* use original interface */
952 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
953 tx->sta = sta_info_get(local, hdr->addr1);
954 tx->fc = le16_to_cpu(hdr->frame_control);
957 * set defaults for things that can be set by
958 * injected radiotap headers
960 control->power_level = local->hw.conf.power_level;
961 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
962 if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
963 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
965 /* process and remove the injection radiotap header */
966 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
967 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
968 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
973 * we removed the radiotap header after this point,
974 * we filled control with what we could use
975 * set to the actual ieee header now
977 hdr = (struct ieee80211_hdr *) skb->data;
978 res = TXRX_QUEUED; /* indication it was monitor packet */
981 tx->u.tx.control = control;
982 tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
983 if (is_multicast_ether_addr(hdr->addr1))
984 control->flags |= IEEE80211_TXCTL_NO_ACK;
986 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
987 tx->fragmented = local->fragmentation_threshold <
988 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
989 skb->len + FCS_LEN > local->fragmentation_threshold &&
990 (!local->ops->set_frag_threshold);
992 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
993 else if (tx->sta->clear_dst_mask) {
994 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
995 tx->sta->clear_dst_mask = 0;
997 hdrlen = ieee80211_get_hdrlen(tx->fc);
998 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
999 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1000 tx->ethertype = (pos[0] << 8) | pos[1];
1002 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1007 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1008 * finished with it. */
1009 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1010 struct sk_buff *skb,
1011 struct net_device *mdev,
1012 struct ieee80211_tx_control *control)
1014 struct ieee80211_tx_packet_data *pkt_data;
1015 struct net_device *dev;
1017 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1018 dev = dev_get_by_index(pkt_data->ifindex);
1019 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1025 __ieee80211_tx_prepare(tx, skb, dev, control);
1029 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1030 struct ieee80211_txrx_data *tx)
1032 struct ieee80211_tx_control *control = tx->u.tx.control;
1035 if (!ieee80211_qdisc_installed(local->mdev) &&
1036 __ieee80211_queue_stopped(local, 0)) {
1037 netif_stop_queue(local->mdev);
1038 return IEEE80211_TX_AGAIN;
1041 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1042 ret = local->ops->tx(local_to_hw(local), skb, control);
1044 return IEEE80211_TX_AGAIN;
1045 local->mdev->trans_start = jiffies;
1046 ieee80211_led_tx(local, 1);
1048 if (tx->u.tx.extra_frag) {
1049 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1050 IEEE80211_TXCTL_USE_CTS_PROTECT |
1051 IEEE80211_TXCTL_CLEAR_DST_MASK |
1052 IEEE80211_TXCTL_FIRST_FRAGMENT);
1053 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1054 if (!tx->u.tx.extra_frag[i])
1056 if (__ieee80211_queue_stopped(local, control->queue))
1057 return IEEE80211_TX_FRAG_AGAIN;
1058 if (i == tx->u.tx.num_extra_frag) {
1059 control->tx_rate = tx->u.tx.last_frag_hwrate;
1060 control->rate = tx->u.tx.last_frag_rate;
1061 if (tx->u.tx.probe_last_frag)
1063 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1066 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1069 ieee80211_dump_frame(local->mdev->name,
1070 "TX to low-level driver",
1071 tx->u.tx.extra_frag[i]);
1072 ret = local->ops->tx(local_to_hw(local),
1073 tx->u.tx.extra_frag[i],
1076 return IEEE80211_TX_FRAG_AGAIN;
1077 local->mdev->trans_start = jiffies;
1078 ieee80211_led_tx(local, 1);
1079 tx->u.tx.extra_frag[i] = NULL;
1081 kfree(tx->u.tx.extra_frag);
1082 tx->u.tx.extra_frag = NULL;
1084 return IEEE80211_TX_OK;
1087 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1088 struct ieee80211_tx_control *control, int mgmt)
1090 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1091 struct sta_info *sta;
1092 ieee80211_tx_handler *handler;
1093 struct ieee80211_txrx_data tx;
1094 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1097 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1099 if (unlikely(skb->len < 10)) {
1104 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1106 if (res_prepare == TXRX_DROP) {
1112 tx.u.tx.mgmt_interface = mgmt;
1113 tx.u.tx.mode = local->hw.conf.mode;
1115 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1116 res = TXRX_CONTINUE;
1118 for (handler = local->tx_handlers; *handler != NULL;
1120 res = (*handler)(&tx);
1121 if (res != TXRX_CONTINUE)
1126 skb = tx.skb; /* handlers are allowed to change skb */
1131 if (unlikely(res == TXRX_DROP)) {
1132 I802_DEBUG_INC(local->tx_handlers_drop);
1136 if (unlikely(res == TXRX_QUEUED)) {
1137 I802_DEBUG_INC(local->tx_handlers_queued);
1141 if (tx.u.tx.extra_frag) {
1142 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1144 struct ieee80211_hdr *hdr =
1145 (struct ieee80211_hdr *)
1146 tx.u.tx.extra_frag[i]->data;
1148 if (i + 1 < tx.u.tx.num_extra_frag) {
1149 next_len = tx.u.tx.extra_frag[i + 1]->len;
1152 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1153 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1155 dur = ieee80211_duration(&tx, 0, next_len);
1156 hdr->duration_id = cpu_to_le16(dur);
1161 ret = __ieee80211_tx(local, skb, &tx);
1163 struct ieee80211_tx_stored_packet *store =
1164 &local->pending_packet[control->queue];
1166 if (ret == IEEE80211_TX_FRAG_AGAIN)
1168 set_bit(IEEE80211_LINK_STATE_PENDING,
1169 &local->state[control->queue]);
1171 /* When the driver gets out of buffers during sending of
1172 * fragments and calls ieee80211_stop_queue, there is
1173 * a small window between IEEE80211_LINK_STATE_XOFF and
1174 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1175 * gets available in that window (i.e. driver calls
1176 * ieee80211_wake_queue), we would end up with ieee80211_tx
1177 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1178 * continuing transmitting here when that situation is
1179 * possible to have happened. */
1180 if (!__ieee80211_queue_stopped(local, control->queue)) {
1181 clear_bit(IEEE80211_LINK_STATE_PENDING,
1182 &local->state[control->queue]);
1185 memcpy(&store->control, control,
1186 sizeof(struct ieee80211_tx_control));
1188 store->extra_frag = tx.u.tx.extra_frag;
1189 store->num_extra_frag = tx.u.tx.num_extra_frag;
1190 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1191 store->last_frag_rate = tx.u.tx.last_frag_rate;
1192 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1199 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1200 if (tx.u.tx.extra_frag[i])
1201 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1202 kfree(tx.u.tx.extra_frag);
1206 /* device xmit handlers */
1208 int ieee80211_master_start_xmit(struct sk_buff *skb,
1209 struct net_device *dev)
1211 struct ieee80211_tx_control control;
1212 struct ieee80211_tx_packet_data *pkt_data;
1213 struct net_device *odev = NULL;
1214 struct ieee80211_sub_if_data *osdata;
1219 * copy control out of the skb so other people can use skb->cb
1221 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1222 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1224 if (pkt_data->ifindex)
1225 odev = dev_get_by_index(pkt_data->ifindex);
1226 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1230 if (unlikely(!odev)) {
1231 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1232 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1233 "originating device\n", dev->name);
1238 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1240 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1241 if (skb_headroom(skb) < headroom) {
1242 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1249 control.ifindex = odev->ifindex;
1250 control.type = osdata->type;
1251 if (pkt_data->req_tx_status)
1252 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1253 if (pkt_data->do_not_encrypt)
1254 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1255 if (pkt_data->requeue)
1256 control.flags |= IEEE80211_TXCTL_REQUEUE;
1257 control.queue = pkt_data->queue;
1259 ret = ieee80211_tx(odev, skb, &control,
1260 control.type == IEEE80211_IF_TYPE_MGMT);
1266 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1267 struct net_device *dev)
1269 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1270 struct ieee80211_tx_packet_data *pkt_data;
1271 struct ieee80211_radiotap_header *prthdr =
1272 (struct ieee80211_radiotap_header *)skb->data;
1276 * there must be a radiotap header at the
1277 * start in this case
1279 if (unlikely(prthdr->it_version)) {
1280 /* only version 0 is supported */
1282 return NETDEV_TX_OK;
1285 skb->dev = local->mdev;
1287 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1288 memset(pkt_data, 0, sizeof(*pkt_data));
1289 pkt_data->ifindex = dev->ifindex;
1290 pkt_data->mgmt_iface = 0;
1291 pkt_data->do_not_encrypt = 1;
1293 /* above needed because we set skb device to master */
1296 * fix up the pointers accounting for the radiotap
1297 * header still being in there. We are being given
1298 * a precooked IEEE80211 header so no need for
1301 len = le16_to_cpu(get_unaligned(&prthdr->it_len));
1302 skb_set_mac_header(skb, len);
1303 skb_set_network_header(skb, len + sizeof(struct ieee80211_hdr));
1304 skb_set_transport_header(skb, len + sizeof(struct ieee80211_hdr));
1307 * pass the radiotap header up to
1308 * the next stage intact
1310 dev_queue_xmit(skb);
1312 return NETDEV_TX_OK;
1316 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1317 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1318 * @skb: packet to be sent
1319 * @dev: incoming interface
1321 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1322 * not be freed, and caller is responsible for either retrying later or freeing
1325 * This function takes in an Ethernet header and encapsulates it with suitable
1326 * IEEE 802.11 header based on which interface the packet is coming in. The
1327 * encapsulated packet will then be passed to master interface, wlan#.11, for
1328 * transmission (through low-level driver).
1330 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1331 struct net_device *dev)
1333 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1334 struct ieee80211_tx_packet_data *pkt_data;
1335 struct ieee80211_sub_if_data *sdata;
1336 int ret = 1, head_need;
1337 u16 ethertype, hdrlen, fc;
1338 struct ieee80211_hdr hdr;
1339 const u8 *encaps_data;
1340 int encaps_len, skip_header_bytes;
1341 int nh_pos, h_pos, no_encrypt = 0;
1342 struct sta_info *sta;
1344 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1345 if (unlikely(skb->len < ETH_HLEN)) {
1346 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1347 dev->name, skb->len);
1352 nh_pos = skb_network_header(skb) - skb->data;
1353 h_pos = skb_transport_header(skb) - skb->data;
1355 /* convert Ethernet header to proper 802.11 header (based on
1356 * operation mode) */
1357 ethertype = (skb->data[12] << 8) | skb->data[13];
1358 /* TODO: handling for 802.1x authorized/unauthorized port */
1359 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1361 if (likely(sdata->type == IEEE80211_IF_TYPE_AP ||
1362 sdata->type == IEEE80211_IF_TYPE_VLAN)) {
1363 fc |= IEEE80211_FCTL_FROMDS;
1365 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1366 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1367 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1369 } else if (sdata->type == IEEE80211_IF_TYPE_WDS) {
1370 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1372 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1373 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1374 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1375 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1377 } else if (sdata->type == IEEE80211_IF_TYPE_STA) {
1378 fc |= IEEE80211_FCTL_TODS;
1380 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1381 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1382 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1384 } else if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
1386 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1387 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1388 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1395 /* receiver is QoS enabled, use a QoS type frame */
1396 sta = sta_info_get(local, hdr.addr1);
1398 if (sta->flags & WLAN_STA_WME) {
1399 fc |= IEEE80211_STYPE_QOS_DATA;
1405 hdr.frame_control = cpu_to_le16(fc);
1406 hdr.duration_id = 0;
1409 skip_header_bytes = ETH_HLEN;
1410 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1411 encaps_data = bridge_tunnel_header;
1412 encaps_len = sizeof(bridge_tunnel_header);
1413 skip_header_bytes -= 2;
1414 } else if (ethertype >= 0x600) {
1415 encaps_data = rfc1042_header;
1416 encaps_len = sizeof(rfc1042_header);
1417 skip_header_bytes -= 2;
1423 skb_pull(skb, skip_header_bytes);
1424 nh_pos -= skip_header_bytes;
1425 h_pos -= skip_header_bytes;
1427 /* TODO: implement support for fragments so that there is no need to
1428 * reallocate and copy payload; it might be enough to support one
1429 * extra fragment that would be copied in the beginning of the frame
1430 * data.. anyway, it would be nice to include this into skb structure
1433 * There are few options for this:
1434 * use skb->cb as an extra space for 802.11 header
1435 * allocate new buffer if not enough headroom
1436 * make sure that there is enough headroom in every skb by increasing
1437 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1438 * alloc_skb() (net/core/skbuff.c)
1440 head_need = hdrlen + encaps_len + local->tx_headroom;
1441 head_need -= skb_headroom(skb);
1443 /* We are going to modify skb data, so make a copy of it if happens to
1444 * be cloned. This could happen, e.g., with Linux bridge code passing
1445 * us broadcast frames. */
1447 if (head_need > 0 || skb_cloned(skb)) {
1449 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1450 "of headroom\n", dev->name, head_need);
1453 if (skb_cloned(skb))
1454 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1456 I802_DEBUG_INC(local->tx_expand_skb_head);
1457 /* Since we have to reallocate the buffer, make sure that there
1458 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1459 * before payload and 12 after). */
1460 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1462 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1469 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1470 nh_pos += encaps_len;
1471 h_pos += encaps_len;
1473 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1477 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1478 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1479 pkt_data->ifindex = dev->ifindex;
1480 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1481 pkt_data->do_not_encrypt = no_encrypt;
1483 skb->dev = local->mdev;
1484 sdata->stats.tx_packets++;
1485 sdata->stats.tx_bytes += skb->len;
1487 /* Update skb pointers to various headers since this modified frame
1488 * is going to go through Linux networking code that may potentially
1489 * need things like pointer to IP header. */
1490 skb_set_mac_header(skb, 0);
1491 skb_set_network_header(skb, nh_pos);
1492 skb_set_transport_header(skb, h_pos);
1494 dev->trans_start = jiffies;
1495 dev_queue_xmit(skb);
1507 * This is the transmit routine for the 802.11 type interfaces
1508 * called by upper layers of the linux networking
1509 * stack when it has a frame to transmit
1511 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1513 struct ieee80211_sub_if_data *sdata;
1514 struct ieee80211_tx_packet_data *pkt_data;
1515 struct ieee80211_hdr *hdr;
1518 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1520 if (skb->len < 10) {
1525 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1526 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1533 hdr = (struct ieee80211_hdr *) skb->data;
1534 fc = le16_to_cpu(hdr->frame_control);
1536 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1537 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1538 pkt_data->ifindex = sdata->dev->ifindex;
1539 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1541 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1542 skb->dev = sdata->local->mdev;
1545 * We're using the protocol field of the the frame control header
1546 * to request TX callback for hostapd. BIT(1) is checked.
1548 if ((fc & BIT(1)) == BIT(1)) {
1549 pkt_data->req_tx_status = 1;
1551 hdr->frame_control = cpu_to_le16(fc);
1554 pkt_data->do_not_encrypt = !(fc & IEEE80211_FCTL_PROTECTED);
1556 sdata->stats.tx_packets++;
1557 sdata->stats.tx_bytes += skb->len;
1559 dev_queue_xmit(skb);
1564 /* helper functions for pending packets for when queues are stopped */
1566 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1569 struct ieee80211_tx_stored_packet *store;
1571 for (i = 0; i < local->hw.queues; i++) {
1572 if (!__ieee80211_queue_pending(local, i))
1574 store = &local->pending_packet[i];
1575 kfree_skb(store->skb);
1576 for (j = 0; j < store->num_extra_frag; j++)
1577 kfree_skb(store->extra_frag[j]);
1578 kfree(store->extra_frag);
1579 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1583 void ieee80211_tx_pending(unsigned long data)
1585 struct ieee80211_local *local = (struct ieee80211_local *)data;
1586 struct net_device *dev = local->mdev;
1587 struct ieee80211_tx_stored_packet *store;
1588 struct ieee80211_txrx_data tx;
1589 int i, ret, reschedule = 0;
1591 netif_tx_lock_bh(dev);
1592 for (i = 0; i < local->hw.queues; i++) {
1593 if (__ieee80211_queue_stopped(local, i))
1595 if (!__ieee80211_queue_pending(local, i)) {
1599 store = &local->pending_packet[i];
1600 tx.u.tx.control = &store->control;
1601 tx.u.tx.extra_frag = store->extra_frag;
1602 tx.u.tx.num_extra_frag = store->num_extra_frag;
1603 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1604 tx.u.tx.last_frag_rate = store->last_frag_rate;
1605 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1606 ret = __ieee80211_tx(local, store->skb, &tx);
1608 if (ret == IEEE80211_TX_FRAG_AGAIN)
1611 clear_bit(IEEE80211_LINK_STATE_PENDING,
1616 netif_tx_unlock_bh(dev);
1618 if (!ieee80211_qdisc_installed(dev)) {
1619 if (!__ieee80211_queue_stopped(local, 0))
1620 netif_wake_queue(dev);
1622 netif_schedule(dev);
1626 /* functions for drivers to get certain frames */
1628 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1629 struct ieee80211_if_ap *bss,
1630 struct sk_buff *skb)
1634 int i, have_bits = 0, n1, n2;
1636 /* Generate bitmap for TIM only if there are any STAs in power save
1638 read_lock_bh(&local->sta_lock);
1639 if (atomic_read(&bss->num_sta_ps) > 0)
1640 /* in the hope that this is faster than
1641 * checking byte-for-byte */
1642 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1643 IEEE80211_MAX_AID+1);
1645 if (bss->dtim_count == 0)
1646 bss->dtim_count = bss->dtim_period - 1;
1650 tim = pos = (u8 *) skb_put(skb, 6);
1651 *pos++ = WLAN_EID_TIM;
1653 *pos++ = bss->dtim_count;
1654 *pos++ = bss->dtim_period;
1656 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1660 /* Find largest even number N1 so that bits numbered 1 through
1661 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1662 * (N2 + 1) x 8 through 2007 are 0. */
1664 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1671 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1678 /* Bitmap control */
1680 /* Part Virt Bitmap */
1681 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1683 tim[1] = n2 - n1 + 4;
1684 skb_put(skb, n2 - n1);
1686 *pos++ = aid0; /* Bitmap control */
1687 *pos++ = 0; /* Part Virt Bitmap */
1689 read_unlock_bh(&local->sta_lock);
1692 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1693 struct ieee80211_tx_control *control)
1695 struct ieee80211_local *local = hw_to_local(hw);
1696 struct sk_buff *skb;
1697 struct net_device *bdev;
1698 struct ieee80211_sub_if_data *sdata = NULL;
1699 struct ieee80211_if_ap *ap = NULL;
1700 struct ieee80211_rate *rate;
1701 struct rate_control_extra extra;
1702 u8 *b_head, *b_tail;
1705 bdev = dev_get_by_index(if_id);
1707 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1712 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1714 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1715 if (net_ratelimit())
1716 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1717 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1718 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1722 /* Assume we are generating the normal beacon locally */
1723 b_head = ap->beacon_head;
1724 b_tail = ap->beacon_tail;
1725 bh_len = ap->beacon_head_len;
1726 bt_len = ap->beacon_tail_len;
1728 skb = dev_alloc_skb(local->tx_headroom +
1729 bh_len + bt_len + 256 /* maximum TIM len */);
1733 skb_reserve(skb, local->tx_headroom);
1734 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1736 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1738 ieee80211_beacon_add_tim(local, ap, skb);
1741 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1745 memset(&extra, 0, sizeof(extra));
1746 extra.mode = local->oper_hw_mode;
1748 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1750 if (net_ratelimit()) {
1751 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1752 "found\n", local->mdev->name);
1758 control->tx_rate = (sdata->short_preamble &&
1759 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1760 rate->val2 : rate->val;
1761 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1762 control->power_level = local->hw.conf.power_level;
1763 control->flags |= IEEE80211_TXCTL_NO_ACK;
1764 control->retry_limit = 1;
1765 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1771 EXPORT_SYMBOL(ieee80211_beacon_get);
1773 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1774 const void *frame, size_t frame_len,
1775 const struct ieee80211_tx_control *frame_txctl,
1776 struct ieee80211_rts *rts)
1778 const struct ieee80211_hdr *hdr = frame;
1781 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1782 rts->frame_control = cpu_to_le16(fctl);
1783 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1784 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1785 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1787 EXPORT_SYMBOL(ieee80211_rts_get);
1789 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1790 const void *frame, size_t frame_len,
1791 const struct ieee80211_tx_control *frame_txctl,
1792 struct ieee80211_cts *cts)
1794 const struct ieee80211_hdr *hdr = frame;
1797 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1798 cts->frame_control = cpu_to_le16(fctl);
1799 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1800 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1802 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1805 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1806 struct ieee80211_tx_control *control)
1808 struct ieee80211_local *local = hw_to_local(hw);
1809 struct sk_buff *skb;
1810 struct sta_info *sta;
1811 ieee80211_tx_handler *handler;
1812 struct ieee80211_txrx_data tx;
1813 ieee80211_txrx_result res = TXRX_DROP;
1814 struct net_device *bdev;
1815 struct ieee80211_sub_if_data *sdata;
1816 struct ieee80211_if_ap *bss = NULL;
1818 bdev = dev_get_by_index(if_id);
1820 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1824 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1827 if (bss->dtim_count != 0)
1828 return NULL; /* send buffered bc/mc only after DTIM beacon */
1829 memset(control, 0, sizeof(*control));
1831 skb = skb_dequeue(&bss->ps_bc_buf);
1834 local->total_ps_buffered--;
1836 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1837 struct ieee80211_hdr *hdr =
1838 (struct ieee80211_hdr *) skb->data;
1839 /* more buffered multicast/broadcast frames ==> set
1840 * MoreData flag in IEEE 802.11 header to inform PS
1842 hdr->frame_control |=
1843 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1846 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1848 dev_kfree_skb_any(skb);
1851 tx.u.tx.ps_buffered = 1;
1853 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1854 res = (*handler)(&tx);
1855 if (res == TXRX_DROP || res == TXRX_QUEUED)
1859 skb = tx.skb; /* handlers are allowed to change skb */
1861 if (res == TXRX_DROP) {
1862 I802_DEBUG_INC(local->tx_handlers_drop);
1865 } else if (res == TXRX_QUEUED) {
1866 I802_DEBUG_INC(local->tx_handlers_queued);
1875 EXPORT_SYMBOL(ieee80211_get_buffered_bc);