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"
28 #include "ieee80211_led.h"
32 #include "ieee80211_rate.h"
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_hdr *hdr)
43 /* Set the sequence number for this frame. */
44 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
46 /* Increase the sequence number. */
47 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname, const char *title,
52 const struct sk_buff *skb)
54 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
59 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
65 fc = le16_to_cpu(hdr->frame_control);
66 hdrlen = ieee80211_get_hdrlen(fc);
67 if (hdrlen > skb->len)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc, le16_to_cpu(hdr->duration_id));
73 printk(" A1=%s", print_mac(mac, hdr->addr1));
75 printk(" A2=%s", print_mac(mac, hdr->addr2));
77 printk(" A3=%s", print_mac(mac, hdr->addr3));
79 printk(" A4=%s", print_mac(mac, hdr->addr4));
82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
89 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
92 int rate, mrate, erp, dur, i;
93 struct ieee80211_rate *txrate = tx->u.tx.rate;
94 struct ieee80211_local *local = tx->local;
95 struct ieee80211_supported_band *sband;
97 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
100 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
101 erp = txrate->flags & IEEE80211_RATE_ERP_G;
104 * data and mgmt (except PS Poll):
105 * - during CFP: 32768
106 * - during contention period:
107 * if addr1 is group address: 0
108 * if more fragments = 0 and addr1 is individual address: time to
109 * transmit one ACK plus SIFS
110 * if more fragments = 1 and addr1 is individual address: time to
111 * transmit next fragment plus 2 x ACK plus 3 x SIFS
114 * - control response frame (CTS or ACK) shall be transmitted using the
115 * same rate as the immediately previous frame in the frame exchange
116 * sequence, if this rate belongs to the PHY mandatory rates, or else
117 * at the highest possible rate belonging to the PHY rates in the
121 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
122 /* TODO: These control frames are not currently sent by
123 * 80211.o, but should they be implemented, this function
124 * needs to be updated to support duration field calculation.
126 * RTS: time needed to transmit pending data/mgmt frame plus
127 * one CTS frame plus one ACK frame plus 3 x SIFS
128 * CTS: duration of immediately previous RTS minus time
129 * required to transmit CTS and its SIFS
130 * ACK: 0 if immediately previous directed data/mgmt had
131 * more=0, with more=1 duration in ACK frame is duration
132 * from previous frame minus time needed to transmit ACK
134 * PS Poll: BIT(15) | BIT(14) | aid
140 if (0 /* FIX: data/mgmt during CFP */)
143 if (group_addr) /* Group address as the destination - no ACK */
146 /* Individual destination address:
147 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
148 * CTS and ACK frames shall be transmitted using the highest rate in
149 * basic rate set that is less than or equal to the rate of the
150 * immediately previous frame and that is using the same modulation
151 * (CCK or OFDM). If no basic rate set matches with these requirements,
152 * the highest mandatory rate of the PHY that is less than or equal to
153 * the rate of the previous frame is used.
154 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
157 /* use lowest available if everything fails */
158 mrate = sband->bitrates[0].bitrate;
159 for (i = 0; i < sband->n_bitrates; i++) {
160 struct ieee80211_rate *r = &sband->bitrates[i];
162 if (r->bitrate > txrate->bitrate)
165 if (tx->sdata->basic_rates & BIT(i))
168 switch (sband->band) {
169 case IEEE80211_BAND_2GHZ: {
171 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
172 flag = IEEE80211_RATE_MANDATORY_G;
174 flag = IEEE80211_RATE_MANDATORY_B;
179 case IEEE80211_BAND_5GHZ:
180 if (r->flags & IEEE80211_RATE_MANDATORY_A)
183 case IEEE80211_NUM_BANDS:
189 /* No matching basic rate found; use highest suitable mandatory
194 /* Time needed to transmit ACK
195 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
196 * to closest integer */
198 dur = ieee80211_frame_duration(local, 10, rate, erp,
199 tx->sdata->bss_conf.use_short_preamble);
202 /* Frame is fragmented: duration increases with time needed to
203 * transmit next fragment plus ACK and 2 x SIFS. */
204 dur *= 2; /* ACK + SIFS */
206 dur += ieee80211_frame_duration(local, next_frag_len,
207 txrate->bitrate, erp,
208 tx->sdata->bss_conf.use_short_preamble);
214 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
217 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
220 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
223 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
226 static int inline is_ieee80211_device(struct net_device *dev,
227 struct net_device *master)
229 return (wdev_priv(dev->ieee80211_ptr) ==
230 wdev_priv(master->ieee80211_ptr));
235 static ieee80211_tx_result
236 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
238 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 struct sk_buff *skb = tx->skb;
240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
241 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
244 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
247 if (unlikely(tx->local->sta_sw_scanning) &&
248 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
249 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
252 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
255 sta_flags = tx->sta ? tx->sta->flags : 0;
257 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
258 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
259 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
260 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 DECLARE_MAC_BUF(mac);
263 printk(KERN_DEBUG "%s: dropped data frame to not "
264 "associated station %s\n",
265 tx->dev->name, print_mac(mac, hdr->addr1));
266 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
267 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
271 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
272 tx->local->num_sta == 0 &&
273 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
275 * No associated STAs - no need to send multicast
286 static ieee80211_tx_result
287 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
291 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
292 ieee80211_include_sequence(tx->sdata, hdr);
297 /* This function is called whenever the AP is about to exceed the maximum limit
298 * of buffered frames for power saving STAs. This situation should not really
299 * happen often during normal operation, so dropping the oldest buffered packet
300 * from each queue should be OK to make some room for new frames. */
301 static void purge_old_ps_buffers(struct ieee80211_local *local)
303 int total = 0, purged = 0;
305 struct ieee80211_sub_if_data *sdata;
306 struct sta_info *sta;
309 * virtual interfaces are protected by RCU
313 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
314 struct ieee80211_if_ap *ap;
315 if (sdata->dev == local->mdev ||
316 sdata->vif.type != IEEE80211_IF_TYPE_AP)
319 skb = skb_dequeue(&ap->ps_bc_buf);
324 total += skb_queue_len(&ap->ps_bc_buf);
328 read_lock_bh(&local->sta_lock);
329 list_for_each_entry(sta, &local->sta_list, list) {
330 skb = skb_dequeue(&sta->ps_tx_buf);
335 total += skb_queue_len(&sta->ps_tx_buf);
337 read_unlock_bh(&local->sta_lock);
339 local->total_ps_buffered = total;
340 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
341 wiphy_name(local->hw.wiphy), purged);
344 static ieee80211_tx_result
345 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
348 * broadcast/multicast frame
350 * If any of the associated stations is in power save mode,
351 * the frame is buffered to be sent after DTIM beacon frame.
352 * This is done either by the hardware or us.
355 /* not AP/IBSS or ordered frame */
356 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
359 /* no stations in PS mode */
360 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
363 /* buffered in mac80211 */
364 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
365 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
366 purge_old_ps_buffers(tx->local);
367 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
369 if (net_ratelimit()) {
370 printk(KERN_DEBUG "%s: BC TX buffer full - "
371 "dropping the oldest frame\n",
374 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
376 tx->local->total_ps_buffered++;
377 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
381 /* buffered in hardware */
382 tx->u.tx.control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM;
387 static ieee80211_tx_result
388 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
390 struct sta_info *sta = tx->sta;
391 DECLARE_MAC_BUF(mac);
394 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
395 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
398 if (unlikely((sta->flags & WLAN_STA_PS) &&
399 !(sta->flags & WLAN_STA_PSPOLL))) {
400 struct ieee80211_tx_packet_data *pkt_data;
401 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
402 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
404 print_mac(mac, sta->addr), sta->aid,
405 skb_queue_len(&sta->ps_tx_buf));
406 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
407 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
408 purge_old_ps_buffers(tx->local);
409 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
410 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
411 if (net_ratelimit()) {
412 printk(KERN_DEBUG "%s: STA %s TX "
413 "buffer full - dropping oldest frame\n",
414 tx->dev->name, print_mac(mac, sta->addr));
418 tx->local->total_ps_buffered++;
419 /* Queue frame to be sent after STA sends an PS Poll frame */
420 if (skb_queue_empty(&sta->ps_tx_buf)) {
422 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
423 if (tx->local->ops->set_tim)
424 tx->local->ops->set_tim(local_to_hw(tx->local),
427 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
428 pkt_data->jiffies = jiffies;
429 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
432 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
433 else if (unlikely(sta->flags & WLAN_STA_PS)) {
434 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
435 "set -> send frame\n", tx->dev->name,
436 print_mac(mac, sta->addr));
438 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
439 sta->flags &= ~WLAN_STA_PSPOLL;
444 static ieee80211_tx_result
445 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
447 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
450 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
451 return ieee80211_tx_h_unicast_ps_buf(tx);
453 return ieee80211_tx_h_multicast_ps_buf(tx);
456 static ieee80211_tx_result
457 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
459 struct ieee80211_key *key;
462 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
464 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
466 else if ((key = rcu_dereference(tx->sdata->default_key)))
468 else if (tx->sdata->drop_unencrypted &&
469 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
470 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
471 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
479 tx->key->tx_rx_count++;
480 /* TODO: add threshold stuff again */
482 switch (tx->key->conf.alg) {
484 ftype = fc & IEEE80211_FCTL_FTYPE;
485 stype = fc & IEEE80211_FCTL_STYPE;
487 if (ftype == IEEE80211_FTYPE_MGMT &&
488 stype == IEEE80211_STYPE_AUTH)
492 if (!WLAN_FC_DATA_PRESENT(fc))
498 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
499 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
504 static ieee80211_tx_result
505 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
507 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
508 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
509 struct sk_buff **frags, *first, *frag;
513 int frag_threshold = tx->local->fragmentation_threshold;
515 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
520 hdrlen = ieee80211_get_hdrlen(tx->fc);
521 payload_len = first->len - hdrlen;
522 per_fragm = frag_threshold - hdrlen - FCS_LEN;
523 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
525 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
529 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
530 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
531 pos = first->data + hdrlen + per_fragm;
532 left = payload_len - per_fragm;
533 for (i = 0; i < num_fragm - 1; i++) {
534 struct ieee80211_hdr *fhdr;
540 /* reserve enough extra head and tail room for possible
543 dev_alloc_skb(tx->local->tx_headroom +
545 IEEE80211_ENCRYPT_HEADROOM +
546 IEEE80211_ENCRYPT_TAILROOM);
549 /* Make sure that all fragments use the same priority so
550 * that they end up using the same TX queue */
551 frag->priority = first->priority;
552 skb_reserve(frag, tx->local->tx_headroom +
553 IEEE80211_ENCRYPT_HEADROOM);
554 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
555 memcpy(fhdr, first->data, hdrlen);
556 if (i == num_fragm - 2)
557 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
558 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
559 copylen = left > per_fragm ? per_fragm : left;
560 memcpy(skb_put(frag, copylen), pos, copylen);
565 skb_trim(first, hdrlen + per_fragm);
567 tx->u.tx.num_extra_frag = num_fragm - 1;
568 tx->u.tx.extra_frag = frags;
573 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
575 for (i = 0; i < num_fragm - 1; i++)
577 dev_kfree_skb(frags[i]);
580 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
584 static ieee80211_tx_result
585 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
590 switch (tx->key->conf.alg) {
592 return ieee80211_crypto_wep_encrypt(tx);
594 return ieee80211_crypto_tkip_encrypt(tx);
596 return ieee80211_crypto_ccmp_encrypt(tx);
604 static ieee80211_tx_result
605 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
607 struct rate_selection rsel;
608 struct ieee80211_supported_band *sband;
610 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
612 if (likely(!tx->u.tx.rate)) {
613 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
614 tx->u.tx.rate = rsel.rate;
615 if (unlikely(rsel.probe)) {
616 tx->u.tx.control->flags |=
617 IEEE80211_TXCTL_RATE_CTRL_PROBE;
618 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
619 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate;
620 tx->u.tx.rate = rsel.probe;
622 tx->u.tx.control->alt_retry_rate = NULL;
627 tx->u.tx.control->alt_retry_rate = NULL;
629 if (tx->sdata->bss_conf.use_cts_prot &&
630 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
631 tx->u.tx.last_frag_rate = tx->u.tx.rate;
633 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
635 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
636 tx->u.tx.rate = rsel.nonerp;
637 tx->u.tx.control->tx_rate = rsel.nonerp;
638 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
640 tx->u.tx.last_frag_rate = tx->u.tx.rate;
641 tx->u.tx.control->tx_rate = tx->u.tx.rate;
643 tx->u.tx.control->tx_rate = tx->u.tx.rate;
648 static ieee80211_tx_result
649 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
651 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
652 u16 fc = le16_to_cpu(hdr->frame_control);
654 struct ieee80211_tx_control *control = tx->u.tx.control;
656 if (!control->retry_limit) {
657 if (!is_multicast_ether_addr(hdr->addr1)) {
658 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
659 && tx->local->rts_threshold <
660 IEEE80211_MAX_RTS_THRESHOLD) {
662 IEEE80211_TXCTL_USE_RTS_CTS;
664 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
665 control->retry_limit =
666 tx->local->long_retry_limit;
668 control->retry_limit =
669 tx->local->short_retry_limit;
672 control->retry_limit = 1;
676 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
677 /* Do not use multiple retry rates when sending fragmented
679 * TODO: The last fragment could still use multiple retry
681 control->alt_retry_rate = NULL;
684 /* Use CTS protection for unicast frames sent using extended rates if
685 * there are associated non-ERP stations and RTS/CTS is not configured
687 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
688 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP_G) &&
689 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
690 tx->sdata->bss_conf.use_cts_prot &&
691 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
692 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
694 /* Transmit data frames using short preambles if the driver supports
695 * short preambles at the selected rate and short preambles are
696 * available on the network at the current point in time. */
697 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
698 (tx->u.tx.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
699 tx->sdata->bss_conf.use_short_preamble &&
700 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
701 tx->u.tx.control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
704 /* Setup duration field for the first fragment of the frame. Duration
705 * for remaining fragments will be updated when they are being sent
706 * to low-level driver in ieee80211_tx(). */
707 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
708 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
709 tx->u.tx.extra_frag[0]->len : 0);
710 hdr->duration_id = cpu_to_le16(dur);
712 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
713 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
714 struct ieee80211_supported_band *sband;
715 struct ieee80211_rate *rate, *baserate;
718 sband = tx->local->hw.wiphy->bands[
719 tx->local->hw.conf.channel->band];
721 /* Do not use multiple retry rates when using RTS/CTS */
722 control->alt_retry_rate = NULL;
724 /* Use min(data rate, max base rate) as CTS/RTS rate */
725 rate = tx->u.tx.rate;
728 for (idx = 0; idx < sband->n_bitrates; idx++) {
729 if (sband->bitrates[idx].bitrate > rate->bitrate)
731 if (tx->sdata->basic_rates & BIT(idx) &&
733 (baserate->bitrate < sband->bitrates[idx].bitrate)))
734 baserate = &sband->bitrates[idx];
738 control->rts_cts_rate = baserate;
740 control->rts_cts_rate = &sband->bitrates[0];
744 tx->sta->tx_packets++;
745 tx->sta->tx_fragments++;
746 tx->sta->tx_bytes += tx->skb->len;
747 if (tx->u.tx.extra_frag) {
749 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
750 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
752 tx->u.tx.extra_frag[i]->len;
760 static ieee80211_tx_result
761 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
763 struct ieee80211_local *local = tx->local;
764 struct sk_buff *skb = tx->skb;
765 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
766 u32 load = 0, hdrtime;
767 struct ieee80211_rate *rate = tx->u.tx.rate;
769 /* TODO: this could be part of tx_status handling, so that the number
770 * of retries would be known; TX rate should in that case be stored
771 * somewhere with the packet */
773 /* Estimate total channel use caused by this frame */
775 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
776 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
778 if (tx->u.tx.channel->band == IEEE80211_BAND_5GHZ ||
779 (tx->u.tx.channel->band == IEEE80211_BAND_2GHZ &&
780 rate->flags & IEEE80211_RATE_ERP_G))
781 hdrtime = CHAN_UTIL_HDR_SHORT;
783 hdrtime = CHAN_UTIL_HDR_LONG;
786 if (!is_multicast_ether_addr(hdr->addr1))
789 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
791 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
794 /* TODO: optimise again */
795 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
797 if (tx->u.tx.extra_frag) {
799 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
801 load += tx->u.tx.extra_frag[i]->len *
802 tx->u.tx.rate->bitrate;
806 /* Divide channel_use by 8 to avoid wrapping around the counter */
807 load >>= CHAN_UTIL_SHIFT;
808 local->channel_use_raw += load;
810 tx->sta->channel_use_raw += load;
811 tx->sdata->channel_use_raw += load;
817 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_txrx_data *);
818 static ieee80211_tx_handler ieee80211_tx_handlers[] =
820 ieee80211_tx_h_check_assoc,
821 ieee80211_tx_h_sequence,
822 ieee80211_tx_h_ps_buf,
823 ieee80211_tx_h_select_key,
824 ieee80211_tx_h_michael_mic_add,
825 ieee80211_tx_h_fragment,
826 ieee80211_tx_h_encrypt,
827 ieee80211_tx_h_rate_ctrl,
829 ieee80211_tx_h_load_stats,
833 /* actual transmit path */
836 * deal with packet injection down monitor interface
837 * with Radiotap Header -- only called for monitor mode interface
839 static ieee80211_tx_result
840 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
844 * this is the moment to interpret and discard the radiotap header that
845 * must be at the start of the packet injected in Monitor mode
847 * Need to take some care with endian-ness since radiotap
848 * args are little-endian
851 struct ieee80211_radiotap_iterator iterator;
852 struct ieee80211_radiotap_header *rthdr =
853 (struct ieee80211_radiotap_header *) skb->data;
854 struct ieee80211_supported_band *sband;
855 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
856 struct ieee80211_tx_control *control = tx->u.tx.control;
858 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
860 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
861 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
862 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
865 * for every radiotap entry that is present
866 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
867 * entries present, or -EINVAL on error)
873 ret = ieee80211_radiotap_iterator_next(&iterator);
878 /* see if this argument is something we can use */
879 switch (iterator.this_arg_index) {
881 * You must take care when dereferencing iterator.this_arg
882 * for multibyte types... the pointer is not aligned. Use
883 * get_unaligned((type *)iterator.this_arg) to dereference
884 * iterator.this_arg for type "type" safely on all arches.
886 case IEEE80211_RADIOTAP_RATE:
888 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
889 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
891 target_rate = (*iterator.this_arg) * 5;
892 for (i = 0; i < sband->n_bitrates; i++) {
893 struct ieee80211_rate *r;
895 r = &sband->bitrates[i];
897 if (r->bitrate == target_rate) {
904 case IEEE80211_RADIOTAP_ANTENNA:
906 * radiotap uses 0 for 1st ant, mac80211 is 1 for
909 control->antenna_sel_tx = (*iterator.this_arg) + 1;
913 case IEEE80211_RADIOTAP_DBM_TX_POWER:
914 control->power_level = *iterator.this_arg;
918 case IEEE80211_RADIOTAP_FLAGS:
919 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
921 * this indicates that the skb we have been
922 * handed has the 32-bit FCS CRC at the end...
923 * we should react to that by snipping it off
924 * because it will be recomputed and added
927 if (skb->len < (iterator.max_length + FCS_LEN))
930 skb_trim(skb, skb->len - FCS_LEN);
932 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
934 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
935 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
936 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
940 * Please update the file
941 * Documentation/networking/mac80211-injection.txt
942 * when parsing new fields here.
950 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
954 * remove the radiotap header
955 * iterator->max_length was sanity-checked against
956 * skb->len by iterator init
958 skb_pull(skb, iterator.max_length);
966 static ieee80211_tx_result
967 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
969 struct net_device *dev,
970 struct ieee80211_tx_control *control)
972 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
973 struct ieee80211_hdr *hdr;
974 struct ieee80211_sub_if_data *sdata;
978 memset(tx, 0, sizeof(*tx));
980 tx->dev = dev; /* use original interface */
982 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
983 tx->u.tx.control = control;
985 * Set this flag (used below to indicate "automatic fragmentation"),
986 * it will be cleared/left by radiotap as desired.
988 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
990 /* process and remove the injection radiotap header */
991 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
992 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
993 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
997 * __ieee80211_parse_tx_radiotap has now removed
998 * the radiotap header that was present and pre-filled
999 * 'tx' with tx control information.
1003 hdr = (struct ieee80211_hdr *) skb->data;
1005 tx->sta = sta_info_get(local, hdr->addr1);
1006 tx->fc = le16_to_cpu(hdr->frame_control);
1008 if (is_multicast_ether_addr(hdr->addr1)) {
1009 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
1010 control->flags |= IEEE80211_TXCTL_NO_ACK;
1012 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
1013 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1016 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
1017 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
1018 skb->len + FCS_LEN > local->fragmentation_threshold &&
1019 !local->ops->set_frag_threshold)
1020 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
1022 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
1026 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1027 else if (tx->sta->clear_dst_mask) {
1028 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1029 tx->sta->clear_dst_mask = 0;
1032 hdrlen = ieee80211_get_hdrlen(tx->fc);
1033 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1034 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1035 tx->ethertype = (pos[0] << 8) | pos[1];
1037 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1043 * NB: @tx is uninitialised when passed in here
1045 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1046 struct sk_buff *skb,
1047 struct net_device *mdev,
1048 struct ieee80211_tx_control *control)
1050 struct ieee80211_tx_packet_data *pkt_data;
1051 struct net_device *dev;
1053 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1054 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1055 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1061 /* initialises tx with control */
1062 __ieee80211_tx_prepare(tx, skb, dev, control);
1067 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1068 struct ieee80211_txrx_data *tx)
1070 struct ieee80211_tx_control *control = tx->u.tx.control;
1073 if (!ieee80211_qdisc_installed(local->mdev) &&
1074 __ieee80211_queue_stopped(local, 0)) {
1075 netif_stop_queue(local->mdev);
1076 return IEEE80211_TX_AGAIN;
1079 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1080 "TX to low-level driver", skb);
1081 ret = local->ops->tx(local_to_hw(local), skb, control);
1083 return IEEE80211_TX_AGAIN;
1084 local->mdev->trans_start = jiffies;
1085 ieee80211_led_tx(local, 1);
1087 if (tx->u.tx.extra_frag) {
1088 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1089 IEEE80211_TXCTL_USE_CTS_PROTECT |
1090 IEEE80211_TXCTL_CLEAR_DST_MASK |
1091 IEEE80211_TXCTL_FIRST_FRAGMENT);
1092 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1093 if (!tx->u.tx.extra_frag[i])
1095 if (__ieee80211_queue_stopped(local, control->queue))
1096 return IEEE80211_TX_FRAG_AGAIN;
1097 if (i == tx->u.tx.num_extra_frag) {
1098 control->tx_rate = tx->u.tx.last_frag_rate;
1100 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1102 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1105 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1108 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1109 "TX to low-level driver",
1110 tx->u.tx.extra_frag[i]);
1111 ret = local->ops->tx(local_to_hw(local),
1112 tx->u.tx.extra_frag[i],
1115 return IEEE80211_TX_FRAG_AGAIN;
1116 local->mdev->trans_start = jiffies;
1117 ieee80211_led_tx(local, 1);
1118 tx->u.tx.extra_frag[i] = NULL;
1120 kfree(tx->u.tx.extra_frag);
1121 tx->u.tx.extra_frag = NULL;
1123 return IEEE80211_TX_OK;
1126 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1127 struct ieee80211_tx_control *control)
1129 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1130 struct sta_info *sta;
1131 ieee80211_tx_handler *handler;
1132 struct ieee80211_txrx_data tx;
1133 ieee80211_tx_result res = TX_DROP, res_prepare;
1136 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1138 if (unlikely(skb->len < 10)) {
1143 /* initialises tx */
1144 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1146 if (res_prepare == TX_DROP) {
1152 * key references are protected using RCU and this requires that
1153 * we are in a read-site RCU section during receive processing
1158 tx.u.tx.channel = local->hw.conf.channel;
1160 for (handler = ieee80211_tx_handlers; *handler != NULL;
1162 res = (*handler)(&tx);
1163 if (res != TX_CONTINUE)
1167 skb = tx.skb; /* handlers are allowed to change skb */
1172 if (unlikely(res == TX_DROP)) {
1173 I802_DEBUG_INC(local->tx_handlers_drop);
1177 if (unlikely(res == TX_QUEUED)) {
1178 I802_DEBUG_INC(local->tx_handlers_queued);
1183 if (tx.u.tx.extra_frag) {
1184 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1186 struct ieee80211_hdr *hdr =
1187 (struct ieee80211_hdr *)
1188 tx.u.tx.extra_frag[i]->data;
1190 if (i + 1 < tx.u.tx.num_extra_frag) {
1191 next_len = tx.u.tx.extra_frag[i + 1]->len;
1194 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1196 dur = ieee80211_duration(&tx, 0, next_len);
1197 hdr->duration_id = cpu_to_le16(dur);
1202 ret = __ieee80211_tx(local, skb, &tx);
1204 struct ieee80211_tx_stored_packet *store =
1205 &local->pending_packet[control->queue];
1207 if (ret == IEEE80211_TX_FRAG_AGAIN)
1209 set_bit(IEEE80211_LINK_STATE_PENDING,
1210 &local->state[control->queue]);
1212 /* When the driver gets out of buffers during sending of
1213 * fragments and calls ieee80211_stop_queue, there is
1214 * a small window between IEEE80211_LINK_STATE_XOFF and
1215 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1216 * gets available in that window (i.e. driver calls
1217 * ieee80211_wake_queue), we would end up with ieee80211_tx
1218 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1219 * continuing transmitting here when that situation is
1220 * possible to have happened. */
1221 if (!__ieee80211_queue_stopped(local, control->queue)) {
1222 clear_bit(IEEE80211_LINK_STATE_PENDING,
1223 &local->state[control->queue]);
1226 memcpy(&store->control, control,
1227 sizeof(struct ieee80211_tx_control));
1229 store->extra_frag = tx.u.tx.extra_frag;
1230 store->num_extra_frag = tx.u.tx.num_extra_frag;
1231 store->last_frag_rate = tx.u.tx.last_frag_rate;
1232 store->last_frag_rate_ctrl_probe =
1233 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1241 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1242 if (tx.u.tx.extra_frag[i])
1243 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1244 kfree(tx.u.tx.extra_frag);
1249 /* device xmit handlers */
1251 int ieee80211_master_start_xmit(struct sk_buff *skb,
1252 struct net_device *dev)
1254 struct ieee80211_tx_control control;
1255 struct ieee80211_tx_packet_data *pkt_data;
1256 struct net_device *odev = NULL;
1257 struct ieee80211_sub_if_data *osdata;
1262 * copy control out of the skb so other people can use skb->cb
1264 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1265 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1267 if (pkt_data->ifindex)
1268 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1269 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1273 if (unlikely(!odev)) {
1274 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1275 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1276 "originating device\n", dev->name);
1281 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1283 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1284 if (skb_headroom(skb) < headroom) {
1285 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1292 control.vif = &osdata->vif;
1293 control.type = osdata->vif.type;
1294 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1295 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1296 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1297 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1298 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1299 control.flags |= IEEE80211_TXCTL_REQUEUE;
1300 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
1301 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
1302 if (pkt_data->flags & IEEE80211_TXPD_AMPDU)
1303 control.flags |= IEEE80211_TXCTL_AMPDU;
1304 control.queue = pkt_data->queue;
1306 ret = ieee80211_tx(odev, skb, &control);
1312 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1313 struct net_device *dev)
1315 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1316 struct ieee80211_tx_packet_data *pkt_data;
1317 struct ieee80211_radiotap_header *prthdr =
1318 (struct ieee80211_radiotap_header *)skb->data;
1321 /* check for not even having the fixed radiotap header part */
1322 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1323 goto fail; /* too short to be possibly valid */
1325 /* is it a header version we can trust to find length from? */
1326 if (unlikely(prthdr->it_version))
1327 goto fail; /* only version 0 is supported */
1329 /* then there must be a radiotap header with a length we can use */
1330 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1332 /* does the skb contain enough to deliver on the alleged length? */
1333 if (unlikely(skb->len < len_rthdr))
1334 goto fail; /* skb too short for claimed rt header extent */
1336 skb->dev = local->mdev;
1338 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1339 memset(pkt_data, 0, sizeof(*pkt_data));
1340 /* needed because we set skb device to master */
1341 pkt_data->ifindex = dev->ifindex;
1343 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1346 * fix up the pointers accounting for the radiotap
1347 * header still being in there. We are being given
1348 * a precooked IEEE80211 header so no need for
1351 skb_set_mac_header(skb, len_rthdr);
1353 * these are just fixed to the end of the rt area since we
1354 * don't have any better information and at this point, nobody cares
1356 skb_set_network_header(skb, len_rthdr);
1357 skb_set_transport_header(skb, len_rthdr);
1359 /* pass the radiotap header up to the next stage intact */
1360 dev_queue_xmit(skb);
1361 return NETDEV_TX_OK;
1365 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1369 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1370 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1371 * @skb: packet to be sent
1372 * @dev: incoming interface
1374 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1375 * not be freed, and caller is responsible for either retrying later or freeing
1378 * This function takes in an Ethernet header and encapsulates it with suitable
1379 * IEEE 802.11 header based on which interface the packet is coming in. The
1380 * encapsulated packet will then be passed to master interface, wlan#.11, for
1381 * transmission (through low-level driver).
1383 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1384 struct net_device *dev)
1386 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1387 struct ieee80211_tx_packet_data *pkt_data;
1388 struct ieee80211_sub_if_data *sdata;
1389 int ret = 1, head_need;
1390 u16 ethertype, hdrlen, fc;
1391 struct ieee80211_hdr hdr;
1392 const u8 *encaps_data;
1393 int encaps_len, skip_header_bytes;
1395 struct sta_info *sta;
1398 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1399 if (unlikely(skb->len < ETH_HLEN)) {
1400 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1401 dev->name, skb->len);
1406 nh_pos = skb_network_header(skb) - skb->data;
1407 h_pos = skb_transport_header(skb) - skb->data;
1409 /* convert Ethernet header to proper 802.11 header (based on
1410 * operation mode) */
1411 ethertype = (skb->data[12] << 8) | skb->data[13];
1412 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1414 switch (sdata->vif.type) {
1415 case IEEE80211_IF_TYPE_AP:
1416 case IEEE80211_IF_TYPE_VLAN:
1417 fc |= IEEE80211_FCTL_FROMDS;
1419 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1420 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1421 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1424 case IEEE80211_IF_TYPE_WDS:
1425 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1427 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1428 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1429 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1430 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1433 case IEEE80211_IF_TYPE_STA:
1434 fc |= IEEE80211_FCTL_TODS;
1436 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1437 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1438 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1441 case IEEE80211_IF_TYPE_IBSS:
1443 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1444 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1445 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1454 * There's no need to try to look up the destination
1455 * if it is a multicast address (which can only happen
1458 if (!is_multicast_ether_addr(hdr.addr1)) {
1459 sta = sta_info_get(local, hdr.addr1);
1461 sta_flags = sta->flags;
1466 /* receiver is QoS enabled, use a QoS type frame */
1467 if (sta_flags & WLAN_STA_WME) {
1468 fc |= IEEE80211_STYPE_QOS_DATA;
1473 * Drop unicast frames to unauthorised stations unless they are
1474 * EAPOL frames from the local station.
1476 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1477 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1478 !(ethertype == ETH_P_PAE &&
1479 compare_ether_addr(dev->dev_addr,
1480 skb->data + ETH_ALEN) == 0))) {
1481 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1482 DECLARE_MAC_BUF(mac);
1484 if (net_ratelimit())
1485 printk(KERN_DEBUG "%s: dropped frame to %s"
1486 " (unauthorized port)\n", dev->name,
1487 print_mac(mac, hdr.addr1));
1490 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1496 hdr.frame_control = cpu_to_le16(fc);
1497 hdr.duration_id = 0;
1500 skip_header_bytes = ETH_HLEN;
1501 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1502 encaps_data = bridge_tunnel_header;
1503 encaps_len = sizeof(bridge_tunnel_header);
1504 skip_header_bytes -= 2;
1505 } else if (ethertype >= 0x600) {
1506 encaps_data = rfc1042_header;
1507 encaps_len = sizeof(rfc1042_header);
1508 skip_header_bytes -= 2;
1514 skb_pull(skb, skip_header_bytes);
1515 nh_pos -= skip_header_bytes;
1516 h_pos -= skip_header_bytes;
1518 /* TODO: implement support for fragments so that there is no need to
1519 * reallocate and copy payload; it might be enough to support one
1520 * extra fragment that would be copied in the beginning of the frame
1521 * data.. anyway, it would be nice to include this into skb structure
1524 * There are few options for this:
1525 * use skb->cb as an extra space for 802.11 header
1526 * allocate new buffer if not enough headroom
1527 * make sure that there is enough headroom in every skb by increasing
1528 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1529 * alloc_skb() (net/core/skbuff.c)
1531 head_need = hdrlen + encaps_len + local->tx_headroom;
1532 head_need -= skb_headroom(skb);
1534 /* We are going to modify skb data, so make a copy of it if happens to
1535 * be cloned. This could happen, e.g., with Linux bridge code passing
1536 * us broadcast frames. */
1538 if (head_need > 0 || skb_cloned(skb)) {
1540 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1541 "of headroom\n", dev->name, head_need);
1544 if (skb_cloned(skb))
1545 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1547 I802_DEBUG_INC(local->tx_expand_skb_head);
1548 /* Since we have to reallocate the buffer, make sure that there
1549 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1550 * before payload and 12 after). */
1551 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1553 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1560 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1561 nh_pos += encaps_len;
1562 h_pos += encaps_len;
1565 if (fc & IEEE80211_STYPE_QOS_DATA) {
1566 __le16 *qos_control;
1568 qos_control = (__le16*) skb_push(skb, 2);
1569 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1571 * Maybe we could actually set some fields here, for now just
1572 * initialise to zero to indicate no special operation.
1576 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1581 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1582 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1583 pkt_data->ifindex = dev->ifindex;
1584 if (ethertype == ETH_P_PAE)
1585 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1587 skb->dev = local->mdev;
1588 dev->stats.tx_packets++;
1589 dev->stats.tx_bytes += skb->len;
1591 /* Update skb pointers to various headers since this modified frame
1592 * is going to go through Linux networking code that may potentially
1593 * need things like pointer to IP header. */
1594 skb_set_mac_header(skb, 0);
1595 skb_set_network_header(skb, nh_pos);
1596 skb_set_transport_header(skb, h_pos);
1598 dev->trans_start = jiffies;
1599 dev_queue_xmit(skb);
1610 /* helper functions for pending packets for when queues are stopped */
1612 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1615 struct ieee80211_tx_stored_packet *store;
1617 for (i = 0; i < local->hw.queues; i++) {
1618 if (!__ieee80211_queue_pending(local, i))
1620 store = &local->pending_packet[i];
1621 kfree_skb(store->skb);
1622 for (j = 0; j < store->num_extra_frag; j++)
1623 kfree_skb(store->extra_frag[j]);
1624 kfree(store->extra_frag);
1625 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1629 void ieee80211_tx_pending(unsigned long data)
1631 struct ieee80211_local *local = (struct ieee80211_local *)data;
1632 struct net_device *dev = local->mdev;
1633 struct ieee80211_tx_stored_packet *store;
1634 struct ieee80211_txrx_data tx;
1635 int i, ret, reschedule = 0;
1637 netif_tx_lock_bh(dev);
1638 for (i = 0; i < local->hw.queues; i++) {
1639 if (__ieee80211_queue_stopped(local, i))
1641 if (!__ieee80211_queue_pending(local, i)) {
1645 store = &local->pending_packet[i];
1646 tx.u.tx.control = &store->control;
1647 tx.u.tx.extra_frag = store->extra_frag;
1648 tx.u.tx.num_extra_frag = store->num_extra_frag;
1649 tx.u.tx.last_frag_rate = store->last_frag_rate;
1651 if (store->last_frag_rate_ctrl_probe)
1652 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1653 ret = __ieee80211_tx(local, store->skb, &tx);
1655 if (ret == IEEE80211_TX_FRAG_AGAIN)
1658 clear_bit(IEEE80211_LINK_STATE_PENDING,
1663 netif_tx_unlock_bh(dev);
1665 if (!ieee80211_qdisc_installed(dev)) {
1666 if (!__ieee80211_queue_stopped(local, 0))
1667 netif_wake_queue(dev);
1669 netif_schedule(dev);
1673 /* functions for drivers to get certain frames */
1675 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1676 struct ieee80211_if_ap *bss,
1677 struct sk_buff *skb,
1678 struct beacon_data *beacon)
1682 int i, have_bits = 0, n1, n2;
1684 /* Generate bitmap for TIM only if there are any STAs in power save
1686 read_lock_bh(&local->sta_lock);
1687 if (atomic_read(&bss->num_sta_ps) > 0)
1688 /* in the hope that this is faster than
1689 * checking byte-for-byte */
1690 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1691 IEEE80211_MAX_AID+1);
1693 if (bss->dtim_count == 0)
1694 bss->dtim_count = beacon->dtim_period - 1;
1698 tim = pos = (u8 *) skb_put(skb, 6);
1699 *pos++ = WLAN_EID_TIM;
1701 *pos++ = bss->dtim_count;
1702 *pos++ = beacon->dtim_period;
1704 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1708 /* Find largest even number N1 so that bits numbered 1 through
1709 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1710 * (N2 + 1) x 8 through 2007 are 0. */
1712 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1719 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1726 /* Bitmap control */
1728 /* Part Virt Bitmap */
1729 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1731 tim[1] = n2 - n1 + 4;
1732 skb_put(skb, n2 - n1);
1734 *pos++ = aid0; /* Bitmap control */
1735 *pos++ = 0; /* Part Virt Bitmap */
1737 read_unlock_bh(&local->sta_lock);
1740 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1741 struct ieee80211_vif *vif,
1742 struct ieee80211_tx_control *control)
1744 struct ieee80211_local *local = hw_to_local(hw);
1745 struct sk_buff *skb;
1746 struct net_device *bdev;
1747 struct ieee80211_sub_if_data *sdata = NULL;
1748 struct ieee80211_if_ap *ap = NULL;
1749 struct rate_selection rsel;
1750 struct beacon_data *beacon;
1751 struct ieee80211_supported_band *sband;
1753 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1757 sdata = vif_to_sdata(vif);
1761 beacon = rcu_dereference(ap->beacon);
1763 if (!ap || sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon) {
1764 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1765 if (net_ratelimit())
1766 printk(KERN_DEBUG "no beacon data avail for %s\n",
1768 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1773 /* headroom, head length, tail length and maximum TIM length */
1774 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
1775 beacon->tail_len + 256);
1779 skb_reserve(skb, local->tx_headroom);
1780 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1783 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1785 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1788 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
1792 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1794 if (net_ratelimit()) {
1795 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1797 wiphy_name(local->hw.wiphy));
1805 control->tx_rate = rsel.rate;
1806 if (sdata->bss_conf.use_short_preamble &&
1807 rsel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
1808 control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
1809 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1810 control->flags |= IEEE80211_TXCTL_NO_ACK;
1811 control->retry_limit = 1;
1812 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1821 EXPORT_SYMBOL(ieee80211_beacon_get);
1823 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1824 const void *frame, size_t frame_len,
1825 const struct ieee80211_tx_control *frame_txctl,
1826 struct ieee80211_rts *rts)
1828 const struct ieee80211_hdr *hdr = frame;
1831 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1832 rts->frame_control = cpu_to_le16(fctl);
1833 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1835 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1836 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1838 EXPORT_SYMBOL(ieee80211_rts_get);
1840 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1841 const void *frame, size_t frame_len,
1842 const struct ieee80211_tx_control *frame_txctl,
1843 struct ieee80211_cts *cts)
1845 const struct ieee80211_hdr *hdr = frame;
1848 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1849 cts->frame_control = cpu_to_le16(fctl);
1850 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1851 frame_len, frame_txctl);
1852 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1854 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1857 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1858 struct ieee80211_vif *vif,
1859 struct ieee80211_tx_control *control)
1861 struct ieee80211_local *local = hw_to_local(hw);
1862 struct sk_buff *skb;
1863 struct sta_info *sta;
1864 ieee80211_tx_handler *handler;
1865 struct ieee80211_txrx_data tx;
1866 ieee80211_tx_result res = TX_DROP;
1867 struct net_device *bdev;
1868 struct ieee80211_sub_if_data *sdata;
1869 struct ieee80211_if_ap *bss = NULL;
1870 struct beacon_data *beacon;
1872 sdata = vif_to_sdata(vif);
1880 beacon = rcu_dereference(bss->beacon);
1882 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1889 if (bss->dtim_count != 0)
1890 return NULL; /* send buffered bc/mc only after DTIM beacon */
1891 memset(control, 0, sizeof(*control));
1893 skb = skb_dequeue(&bss->ps_bc_buf);
1896 local->total_ps_buffered--;
1898 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1899 struct ieee80211_hdr *hdr =
1900 (struct ieee80211_hdr *) skb->data;
1901 /* more buffered multicast/broadcast frames ==> set
1902 * MoreData flag in IEEE 802.11 header to inform PS
1904 hdr->frame_control |=
1905 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1908 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1910 dev_kfree_skb_any(skb);
1913 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1914 tx.u.tx.channel = local->hw.conf.channel;
1916 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
1917 res = (*handler)(&tx);
1918 if (res == TX_DROP || res == TX_QUEUED)
1921 skb = tx.skb; /* handlers are allowed to change skb */
1923 if (res == TX_DROP) {
1924 I802_DEBUG_INC(local->tx_handlers_drop);
1927 } else if (res == TX_QUEUED) {
1928 I802_DEBUG_INC(local->tx_handlers_queued);
1937 EXPORT_SYMBOL(ieee80211_get_buffered_bc);