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++;
420 /* Queue frame to be sent after STA sends an PS Poll frame */
421 if (skb_queue_empty(&sta->ps_tx_buf))
422 sta_info_set_tim_bit(sta);
424 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
425 pkt_data->jiffies = jiffies;
426 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
429 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
430 else if (unlikely(sta->flags & WLAN_STA_PS)) {
431 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
432 "set -> send frame\n", tx->dev->name,
433 print_mac(mac, sta->addr));
435 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
436 sta->flags &= ~WLAN_STA_PSPOLL;
441 static ieee80211_tx_result
442 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
444 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
447 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
448 return ieee80211_tx_h_unicast_ps_buf(tx);
450 return ieee80211_tx_h_multicast_ps_buf(tx);
453 static ieee80211_tx_result
454 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
456 struct ieee80211_key *key;
459 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
461 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
463 else if ((key = rcu_dereference(tx->sdata->default_key)))
465 else if (tx->sdata->drop_unencrypted &&
466 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
467 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
468 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
476 tx->key->tx_rx_count++;
477 /* TODO: add threshold stuff again */
479 switch (tx->key->conf.alg) {
481 ftype = fc & IEEE80211_FCTL_FTYPE;
482 stype = fc & IEEE80211_FCTL_STYPE;
484 if (ftype == IEEE80211_FTYPE_MGMT &&
485 stype == IEEE80211_STYPE_AUTH)
489 if (!WLAN_FC_DATA_PRESENT(fc))
495 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
496 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
501 static ieee80211_tx_result
502 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
505 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
506 struct sk_buff **frags, *first, *frag;
510 int frag_threshold = tx->local->fragmentation_threshold;
512 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
517 hdrlen = ieee80211_get_hdrlen(tx->fc);
518 payload_len = first->len - hdrlen;
519 per_fragm = frag_threshold - hdrlen - FCS_LEN;
520 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
522 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
526 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
527 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
528 pos = first->data + hdrlen + per_fragm;
529 left = payload_len - per_fragm;
530 for (i = 0; i < num_fragm - 1; i++) {
531 struct ieee80211_hdr *fhdr;
537 /* reserve enough extra head and tail room for possible
540 dev_alloc_skb(tx->local->tx_headroom +
542 IEEE80211_ENCRYPT_HEADROOM +
543 IEEE80211_ENCRYPT_TAILROOM);
546 /* Make sure that all fragments use the same priority so
547 * that they end up using the same TX queue */
548 frag->priority = first->priority;
549 skb_reserve(frag, tx->local->tx_headroom +
550 IEEE80211_ENCRYPT_HEADROOM);
551 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
552 memcpy(fhdr, first->data, hdrlen);
553 if (i == num_fragm - 2)
554 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
555 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
556 copylen = left > per_fragm ? per_fragm : left;
557 memcpy(skb_put(frag, copylen), pos, copylen);
562 skb_trim(first, hdrlen + per_fragm);
564 tx->u.tx.num_extra_frag = num_fragm - 1;
565 tx->u.tx.extra_frag = frags;
570 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
572 for (i = 0; i < num_fragm - 1; i++)
574 dev_kfree_skb(frags[i]);
577 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
581 static ieee80211_tx_result
582 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
587 switch (tx->key->conf.alg) {
589 return ieee80211_crypto_wep_encrypt(tx);
591 return ieee80211_crypto_tkip_encrypt(tx);
593 return ieee80211_crypto_ccmp_encrypt(tx);
601 static ieee80211_tx_result
602 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
604 struct rate_selection rsel;
605 struct ieee80211_supported_band *sband;
607 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
609 if (likely(!tx->u.tx.rate)) {
610 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
611 tx->u.tx.rate = rsel.rate;
612 if (unlikely(rsel.probe)) {
613 tx->u.tx.control->flags |=
614 IEEE80211_TXCTL_RATE_CTRL_PROBE;
615 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
616 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate;
617 tx->u.tx.rate = rsel.probe;
619 tx->u.tx.control->alt_retry_rate = NULL;
624 tx->u.tx.control->alt_retry_rate = NULL;
626 if (tx->sdata->bss_conf.use_cts_prot &&
627 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
628 tx->u.tx.last_frag_rate = tx->u.tx.rate;
630 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
632 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
633 tx->u.tx.rate = rsel.nonerp;
634 tx->u.tx.control->tx_rate = rsel.nonerp;
635 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
637 tx->u.tx.last_frag_rate = tx->u.tx.rate;
638 tx->u.tx.control->tx_rate = tx->u.tx.rate;
640 tx->u.tx.control->tx_rate = tx->u.tx.rate;
645 static ieee80211_tx_result
646 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
648 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
649 u16 fc = le16_to_cpu(hdr->frame_control);
651 struct ieee80211_tx_control *control = tx->u.tx.control;
653 if (!control->retry_limit) {
654 if (!is_multicast_ether_addr(hdr->addr1)) {
655 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
656 && tx->local->rts_threshold <
657 IEEE80211_MAX_RTS_THRESHOLD) {
659 IEEE80211_TXCTL_USE_RTS_CTS;
661 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
662 control->retry_limit =
663 tx->local->long_retry_limit;
665 control->retry_limit =
666 tx->local->short_retry_limit;
669 control->retry_limit = 1;
673 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
674 /* Do not use multiple retry rates when sending fragmented
676 * TODO: The last fragment could still use multiple retry
678 control->alt_retry_rate = NULL;
681 /* Use CTS protection for unicast frames sent using extended rates if
682 * there are associated non-ERP stations and RTS/CTS is not configured
684 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
685 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP_G) &&
686 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
687 tx->sdata->bss_conf.use_cts_prot &&
688 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
689 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
691 /* Transmit data frames using short preambles if the driver supports
692 * short preambles at the selected rate and short preambles are
693 * available on the network at the current point in time. */
694 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
695 (tx->u.tx.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
696 tx->sdata->bss_conf.use_short_preamble &&
697 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
698 tx->u.tx.control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
701 /* Setup duration field for the first fragment of the frame. Duration
702 * for remaining fragments will be updated when they are being sent
703 * to low-level driver in ieee80211_tx(). */
704 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
705 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
706 tx->u.tx.extra_frag[0]->len : 0);
707 hdr->duration_id = cpu_to_le16(dur);
709 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
710 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
711 struct ieee80211_supported_band *sband;
712 struct ieee80211_rate *rate, *baserate;
715 sband = tx->local->hw.wiphy->bands[
716 tx->local->hw.conf.channel->band];
718 /* Do not use multiple retry rates when using RTS/CTS */
719 control->alt_retry_rate = NULL;
721 /* Use min(data rate, max base rate) as CTS/RTS rate */
722 rate = tx->u.tx.rate;
725 for (idx = 0; idx < sband->n_bitrates; idx++) {
726 if (sband->bitrates[idx].bitrate > rate->bitrate)
728 if (tx->sdata->basic_rates & BIT(idx) &&
730 (baserate->bitrate < sband->bitrates[idx].bitrate)))
731 baserate = &sband->bitrates[idx];
735 control->rts_cts_rate = baserate;
737 control->rts_cts_rate = &sband->bitrates[0];
741 tx->sta->tx_packets++;
742 tx->sta->tx_fragments++;
743 tx->sta->tx_bytes += tx->skb->len;
744 if (tx->u.tx.extra_frag) {
746 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
747 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
749 tx->u.tx.extra_frag[i]->len;
757 static ieee80211_tx_result
758 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
760 struct ieee80211_local *local = tx->local;
761 struct sk_buff *skb = tx->skb;
762 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
763 u32 load = 0, hdrtime;
764 struct ieee80211_rate *rate = tx->u.tx.rate;
766 /* TODO: this could be part of tx_status handling, so that the number
767 * of retries would be known; TX rate should in that case be stored
768 * somewhere with the packet */
770 /* Estimate total channel use caused by this frame */
772 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
773 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
775 if (tx->u.tx.channel->band == IEEE80211_BAND_5GHZ ||
776 (tx->u.tx.channel->band == IEEE80211_BAND_2GHZ &&
777 rate->flags & IEEE80211_RATE_ERP_G))
778 hdrtime = CHAN_UTIL_HDR_SHORT;
780 hdrtime = CHAN_UTIL_HDR_LONG;
783 if (!is_multicast_ether_addr(hdr->addr1))
786 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
788 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
791 /* TODO: optimise again */
792 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
794 if (tx->u.tx.extra_frag) {
796 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
798 load += tx->u.tx.extra_frag[i]->len *
799 tx->u.tx.rate->bitrate;
803 /* Divide channel_use by 8 to avoid wrapping around the counter */
804 load >>= CHAN_UTIL_SHIFT;
805 local->channel_use_raw += load;
807 tx->sta->channel_use_raw += load;
808 tx->sdata->channel_use_raw += load;
814 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_txrx_data *);
815 static ieee80211_tx_handler ieee80211_tx_handlers[] =
817 ieee80211_tx_h_check_assoc,
818 ieee80211_tx_h_sequence,
819 ieee80211_tx_h_ps_buf,
820 ieee80211_tx_h_select_key,
821 ieee80211_tx_h_michael_mic_add,
822 ieee80211_tx_h_fragment,
823 ieee80211_tx_h_encrypt,
824 ieee80211_tx_h_rate_ctrl,
826 ieee80211_tx_h_load_stats,
830 /* actual transmit path */
833 * deal with packet injection down monitor interface
834 * with Radiotap Header -- only called for monitor mode interface
836 static ieee80211_tx_result
837 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
841 * this is the moment to interpret and discard the radiotap header that
842 * must be at the start of the packet injected in Monitor mode
844 * Need to take some care with endian-ness since radiotap
845 * args are little-endian
848 struct ieee80211_radiotap_iterator iterator;
849 struct ieee80211_radiotap_header *rthdr =
850 (struct ieee80211_radiotap_header *) skb->data;
851 struct ieee80211_supported_band *sband;
852 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
853 struct ieee80211_tx_control *control = tx->u.tx.control;
855 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
857 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
858 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
859 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
862 * for every radiotap entry that is present
863 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
864 * entries present, or -EINVAL on error)
870 ret = ieee80211_radiotap_iterator_next(&iterator);
875 /* see if this argument is something we can use */
876 switch (iterator.this_arg_index) {
878 * You must take care when dereferencing iterator.this_arg
879 * for multibyte types... the pointer is not aligned. Use
880 * get_unaligned((type *)iterator.this_arg) to dereference
881 * iterator.this_arg for type "type" safely on all arches.
883 case IEEE80211_RADIOTAP_RATE:
885 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
886 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
888 target_rate = (*iterator.this_arg) * 5;
889 for (i = 0; i < sband->n_bitrates; i++) {
890 struct ieee80211_rate *r;
892 r = &sband->bitrates[i];
894 if (r->bitrate == target_rate) {
901 case IEEE80211_RADIOTAP_ANTENNA:
903 * radiotap uses 0 for 1st ant, mac80211 is 1 for
906 control->antenna_sel_tx = (*iterator.this_arg) + 1;
910 case IEEE80211_RADIOTAP_DBM_TX_POWER:
911 control->power_level = *iterator.this_arg;
915 case IEEE80211_RADIOTAP_FLAGS:
916 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
918 * this indicates that the skb we have been
919 * handed has the 32-bit FCS CRC at the end...
920 * we should react to that by snipping it off
921 * because it will be recomputed and added
924 if (skb->len < (iterator.max_length + FCS_LEN))
927 skb_trim(skb, skb->len - FCS_LEN);
929 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
931 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
932 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
933 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
937 * Please update the file
938 * Documentation/networking/mac80211-injection.txt
939 * when parsing new fields here.
947 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
951 * remove the radiotap header
952 * iterator->max_length was sanity-checked against
953 * skb->len by iterator init
955 skb_pull(skb, iterator.max_length);
963 static ieee80211_tx_result
964 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
966 struct net_device *dev,
967 struct ieee80211_tx_control *control)
969 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
970 struct ieee80211_hdr *hdr;
971 struct ieee80211_sub_if_data *sdata;
975 memset(tx, 0, sizeof(*tx));
977 tx->dev = dev; /* use original interface */
979 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
980 tx->u.tx.control = control;
982 * Set this flag (used below to indicate "automatic fragmentation"),
983 * it will be cleared/left by radiotap as desired.
985 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
987 /* process and remove the injection radiotap header */
988 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
989 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
990 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
994 * __ieee80211_parse_tx_radiotap has now removed
995 * the radiotap header that was present and pre-filled
996 * 'tx' with tx control information.
1000 hdr = (struct ieee80211_hdr *) skb->data;
1002 tx->sta = sta_info_get(local, hdr->addr1);
1003 tx->fc = le16_to_cpu(hdr->frame_control);
1005 if (is_multicast_ether_addr(hdr->addr1)) {
1006 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
1007 control->flags |= IEEE80211_TXCTL_NO_ACK;
1009 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
1010 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1013 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
1014 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
1015 skb->len + FCS_LEN > local->fragmentation_threshold &&
1016 !local->ops->set_frag_threshold)
1017 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
1019 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
1023 control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT;
1024 else if (tx->sta->flags & WLAN_STA_CLEAR_PS_FILT) {
1025 control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT;
1026 tx->sta->flags &= ~WLAN_STA_CLEAR_PS_FILT;
1029 hdrlen = ieee80211_get_hdrlen(tx->fc);
1030 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1031 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1032 tx->ethertype = (pos[0] << 8) | pos[1];
1034 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1040 * NB: @tx is uninitialised when passed in here
1042 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1043 struct sk_buff *skb,
1044 struct net_device *mdev,
1045 struct ieee80211_tx_control *control)
1047 struct ieee80211_tx_packet_data *pkt_data;
1048 struct net_device *dev;
1050 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1051 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1052 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1058 /* initialises tx with control */
1059 __ieee80211_tx_prepare(tx, skb, dev, control);
1064 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1065 struct ieee80211_txrx_data *tx)
1067 struct ieee80211_tx_control *control = tx->u.tx.control;
1070 if (!ieee80211_qdisc_installed(local->mdev) &&
1071 __ieee80211_queue_stopped(local, 0)) {
1072 netif_stop_queue(local->mdev);
1073 return IEEE80211_TX_AGAIN;
1076 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1077 "TX to low-level driver", skb);
1078 ret = local->ops->tx(local_to_hw(local), skb, control);
1080 return IEEE80211_TX_AGAIN;
1081 local->mdev->trans_start = jiffies;
1082 ieee80211_led_tx(local, 1);
1084 if (tx->u.tx.extra_frag) {
1085 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1086 IEEE80211_TXCTL_USE_CTS_PROTECT |
1087 IEEE80211_TXCTL_CLEAR_PS_FILT |
1088 IEEE80211_TXCTL_FIRST_FRAGMENT);
1089 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1090 if (!tx->u.tx.extra_frag[i])
1092 if (__ieee80211_queue_stopped(local, control->queue))
1093 return IEEE80211_TX_FRAG_AGAIN;
1094 if (i == tx->u.tx.num_extra_frag) {
1095 control->tx_rate = tx->u.tx.last_frag_rate;
1097 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1099 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1102 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1105 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1106 "TX to low-level driver",
1107 tx->u.tx.extra_frag[i]);
1108 ret = local->ops->tx(local_to_hw(local),
1109 tx->u.tx.extra_frag[i],
1112 return IEEE80211_TX_FRAG_AGAIN;
1113 local->mdev->trans_start = jiffies;
1114 ieee80211_led_tx(local, 1);
1115 tx->u.tx.extra_frag[i] = NULL;
1117 kfree(tx->u.tx.extra_frag);
1118 tx->u.tx.extra_frag = NULL;
1120 return IEEE80211_TX_OK;
1123 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1124 struct ieee80211_tx_control *control)
1126 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1127 struct sta_info *sta;
1128 ieee80211_tx_handler *handler;
1129 struct ieee80211_txrx_data tx;
1130 ieee80211_tx_result res = TX_DROP, res_prepare;
1133 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1135 if (unlikely(skb->len < 10)) {
1140 /* initialises tx */
1141 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1143 if (res_prepare == TX_DROP) {
1149 * key references are protected using RCU and this requires that
1150 * we are in a read-site RCU section during receive processing
1155 tx.u.tx.channel = local->hw.conf.channel;
1157 for (handler = ieee80211_tx_handlers; *handler != NULL;
1159 res = (*handler)(&tx);
1160 if (res != TX_CONTINUE)
1164 skb = tx.skb; /* handlers are allowed to change skb */
1169 if (unlikely(res == TX_DROP)) {
1170 I802_DEBUG_INC(local->tx_handlers_drop);
1174 if (unlikely(res == TX_QUEUED)) {
1175 I802_DEBUG_INC(local->tx_handlers_queued);
1180 if (tx.u.tx.extra_frag) {
1181 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1183 struct ieee80211_hdr *hdr =
1184 (struct ieee80211_hdr *)
1185 tx.u.tx.extra_frag[i]->data;
1187 if (i + 1 < tx.u.tx.num_extra_frag) {
1188 next_len = tx.u.tx.extra_frag[i + 1]->len;
1191 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1193 dur = ieee80211_duration(&tx, 0, next_len);
1194 hdr->duration_id = cpu_to_le16(dur);
1199 ret = __ieee80211_tx(local, skb, &tx);
1201 struct ieee80211_tx_stored_packet *store =
1202 &local->pending_packet[control->queue];
1204 if (ret == IEEE80211_TX_FRAG_AGAIN)
1206 set_bit(IEEE80211_LINK_STATE_PENDING,
1207 &local->state[control->queue]);
1209 /* When the driver gets out of buffers during sending of
1210 * fragments and calls ieee80211_stop_queue, there is
1211 * a small window between IEEE80211_LINK_STATE_XOFF and
1212 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1213 * gets available in that window (i.e. driver calls
1214 * ieee80211_wake_queue), we would end up with ieee80211_tx
1215 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1216 * continuing transmitting here when that situation is
1217 * possible to have happened. */
1218 if (!__ieee80211_queue_stopped(local, control->queue)) {
1219 clear_bit(IEEE80211_LINK_STATE_PENDING,
1220 &local->state[control->queue]);
1223 memcpy(&store->control, control,
1224 sizeof(struct ieee80211_tx_control));
1226 store->extra_frag = tx.u.tx.extra_frag;
1227 store->num_extra_frag = tx.u.tx.num_extra_frag;
1228 store->last_frag_rate = tx.u.tx.last_frag_rate;
1229 store->last_frag_rate_ctrl_probe =
1230 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1238 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1239 if (tx.u.tx.extra_frag[i])
1240 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1241 kfree(tx.u.tx.extra_frag);
1246 /* device xmit handlers */
1248 int ieee80211_master_start_xmit(struct sk_buff *skb,
1249 struct net_device *dev)
1251 struct ieee80211_tx_control control;
1252 struct ieee80211_tx_packet_data *pkt_data;
1253 struct net_device *odev = NULL;
1254 struct ieee80211_sub_if_data *osdata;
1259 * copy control out of the skb so other people can use skb->cb
1261 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1262 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1264 if (pkt_data->ifindex)
1265 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1266 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1270 if (unlikely(!odev)) {
1271 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1272 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1273 "originating device\n", dev->name);
1278 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1280 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1281 if (skb_headroom(skb) < headroom) {
1282 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1289 control.vif = &osdata->vif;
1290 control.type = osdata->vif.type;
1291 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1292 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1293 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1294 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1295 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1296 control.flags |= IEEE80211_TXCTL_REQUEUE;
1297 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
1298 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
1299 if (pkt_data->flags & IEEE80211_TXPD_AMPDU)
1300 control.flags |= IEEE80211_TXCTL_AMPDU;
1301 control.queue = pkt_data->queue;
1303 ret = ieee80211_tx(odev, skb, &control);
1309 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1310 struct net_device *dev)
1312 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1313 struct ieee80211_tx_packet_data *pkt_data;
1314 struct ieee80211_radiotap_header *prthdr =
1315 (struct ieee80211_radiotap_header *)skb->data;
1318 /* check for not even having the fixed radiotap header part */
1319 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1320 goto fail; /* too short to be possibly valid */
1322 /* is it a header version we can trust to find length from? */
1323 if (unlikely(prthdr->it_version))
1324 goto fail; /* only version 0 is supported */
1326 /* then there must be a radiotap header with a length we can use */
1327 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1329 /* does the skb contain enough to deliver on the alleged length? */
1330 if (unlikely(skb->len < len_rthdr))
1331 goto fail; /* skb too short for claimed rt header extent */
1333 skb->dev = local->mdev;
1335 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1336 memset(pkt_data, 0, sizeof(*pkt_data));
1337 /* needed because we set skb device to master */
1338 pkt_data->ifindex = dev->ifindex;
1340 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1343 * fix up the pointers accounting for the radiotap
1344 * header still being in there. We are being given
1345 * a precooked IEEE80211 header so no need for
1348 skb_set_mac_header(skb, len_rthdr);
1350 * these are just fixed to the end of the rt area since we
1351 * don't have any better information and at this point, nobody cares
1353 skb_set_network_header(skb, len_rthdr);
1354 skb_set_transport_header(skb, len_rthdr);
1356 /* pass the radiotap header up to the next stage intact */
1357 dev_queue_xmit(skb);
1358 return NETDEV_TX_OK;
1362 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1366 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1367 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1368 * @skb: packet to be sent
1369 * @dev: incoming interface
1371 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1372 * not be freed, and caller is responsible for either retrying later or freeing
1375 * This function takes in an Ethernet header and encapsulates it with suitable
1376 * IEEE 802.11 header based on which interface the packet is coming in. The
1377 * encapsulated packet will then be passed to master interface, wlan#.11, for
1378 * transmission (through low-level driver).
1380 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1381 struct net_device *dev)
1383 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1384 struct ieee80211_tx_packet_data *pkt_data;
1385 struct ieee80211_sub_if_data *sdata;
1386 int ret = 1, head_need;
1387 u16 ethertype, hdrlen, fc;
1388 struct ieee80211_hdr hdr;
1389 const u8 *encaps_data;
1390 int encaps_len, skip_header_bytes;
1392 struct sta_info *sta;
1395 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1396 if (unlikely(skb->len < ETH_HLEN)) {
1397 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1398 dev->name, skb->len);
1403 nh_pos = skb_network_header(skb) - skb->data;
1404 h_pos = skb_transport_header(skb) - skb->data;
1406 /* convert Ethernet header to proper 802.11 header (based on
1407 * operation mode) */
1408 ethertype = (skb->data[12] << 8) | skb->data[13];
1409 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1411 switch (sdata->vif.type) {
1412 case IEEE80211_IF_TYPE_AP:
1413 case IEEE80211_IF_TYPE_VLAN:
1414 fc |= IEEE80211_FCTL_FROMDS;
1416 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1417 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1418 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1421 case IEEE80211_IF_TYPE_WDS:
1422 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1424 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1425 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1426 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1427 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1430 case IEEE80211_IF_TYPE_STA:
1431 fc |= IEEE80211_FCTL_TODS;
1433 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1434 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1435 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1438 case IEEE80211_IF_TYPE_IBSS:
1440 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1441 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1442 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1451 * There's no need to try to look up the destination
1452 * if it is a multicast address (which can only happen
1455 if (!is_multicast_ether_addr(hdr.addr1)) {
1456 sta = sta_info_get(local, hdr.addr1);
1458 sta_flags = sta->flags;
1463 /* receiver is QoS enabled, use a QoS type frame */
1464 if (sta_flags & WLAN_STA_WME) {
1465 fc |= IEEE80211_STYPE_QOS_DATA;
1470 * Drop unicast frames to unauthorised stations unless they are
1471 * EAPOL frames from the local station.
1473 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1474 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1475 !(ethertype == ETH_P_PAE &&
1476 compare_ether_addr(dev->dev_addr,
1477 skb->data + ETH_ALEN) == 0))) {
1478 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1479 DECLARE_MAC_BUF(mac);
1481 if (net_ratelimit())
1482 printk(KERN_DEBUG "%s: dropped frame to %s"
1483 " (unauthorized port)\n", dev->name,
1484 print_mac(mac, hdr.addr1));
1487 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1493 hdr.frame_control = cpu_to_le16(fc);
1494 hdr.duration_id = 0;
1497 skip_header_bytes = ETH_HLEN;
1498 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1499 encaps_data = bridge_tunnel_header;
1500 encaps_len = sizeof(bridge_tunnel_header);
1501 skip_header_bytes -= 2;
1502 } else if (ethertype >= 0x600) {
1503 encaps_data = rfc1042_header;
1504 encaps_len = sizeof(rfc1042_header);
1505 skip_header_bytes -= 2;
1511 skb_pull(skb, skip_header_bytes);
1512 nh_pos -= skip_header_bytes;
1513 h_pos -= skip_header_bytes;
1515 /* TODO: implement support for fragments so that there is no need to
1516 * reallocate and copy payload; it might be enough to support one
1517 * extra fragment that would be copied in the beginning of the frame
1518 * data.. anyway, it would be nice to include this into skb structure
1521 * There are few options for this:
1522 * use skb->cb as an extra space for 802.11 header
1523 * allocate new buffer if not enough headroom
1524 * make sure that there is enough headroom in every skb by increasing
1525 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1526 * alloc_skb() (net/core/skbuff.c)
1528 head_need = hdrlen + encaps_len + local->tx_headroom;
1529 head_need -= skb_headroom(skb);
1531 /* We are going to modify skb data, so make a copy of it if happens to
1532 * be cloned. This could happen, e.g., with Linux bridge code passing
1533 * us broadcast frames. */
1535 if (head_need > 0 || skb_cloned(skb)) {
1537 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1538 "of headroom\n", dev->name, head_need);
1541 if (skb_cloned(skb))
1542 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1544 I802_DEBUG_INC(local->tx_expand_skb_head);
1545 /* Since we have to reallocate the buffer, make sure that there
1546 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1547 * before payload and 12 after). */
1548 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1550 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1557 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1558 nh_pos += encaps_len;
1559 h_pos += encaps_len;
1562 if (fc & IEEE80211_STYPE_QOS_DATA) {
1563 __le16 *qos_control;
1565 qos_control = (__le16*) skb_push(skb, 2);
1566 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1568 * Maybe we could actually set some fields here, for now just
1569 * initialise to zero to indicate no special operation.
1573 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1578 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1579 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1580 pkt_data->ifindex = dev->ifindex;
1581 if (ethertype == ETH_P_PAE)
1582 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1584 skb->dev = local->mdev;
1585 dev->stats.tx_packets++;
1586 dev->stats.tx_bytes += skb->len;
1588 /* Update skb pointers to various headers since this modified frame
1589 * is going to go through Linux networking code that may potentially
1590 * need things like pointer to IP header. */
1591 skb_set_mac_header(skb, 0);
1592 skb_set_network_header(skb, nh_pos);
1593 skb_set_transport_header(skb, h_pos);
1595 dev->trans_start = jiffies;
1596 dev_queue_xmit(skb);
1607 /* helper functions for pending packets for when queues are stopped */
1609 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1612 struct ieee80211_tx_stored_packet *store;
1614 for (i = 0; i < local->hw.queues; i++) {
1615 if (!__ieee80211_queue_pending(local, i))
1617 store = &local->pending_packet[i];
1618 kfree_skb(store->skb);
1619 for (j = 0; j < store->num_extra_frag; j++)
1620 kfree_skb(store->extra_frag[j]);
1621 kfree(store->extra_frag);
1622 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1626 void ieee80211_tx_pending(unsigned long data)
1628 struct ieee80211_local *local = (struct ieee80211_local *)data;
1629 struct net_device *dev = local->mdev;
1630 struct ieee80211_tx_stored_packet *store;
1631 struct ieee80211_txrx_data tx;
1632 int i, ret, reschedule = 0;
1634 netif_tx_lock_bh(dev);
1635 for (i = 0; i < local->hw.queues; i++) {
1636 if (__ieee80211_queue_stopped(local, i))
1638 if (!__ieee80211_queue_pending(local, i)) {
1642 store = &local->pending_packet[i];
1643 tx.u.tx.control = &store->control;
1644 tx.u.tx.extra_frag = store->extra_frag;
1645 tx.u.tx.num_extra_frag = store->num_extra_frag;
1646 tx.u.tx.last_frag_rate = store->last_frag_rate;
1648 if (store->last_frag_rate_ctrl_probe)
1649 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1650 ret = __ieee80211_tx(local, store->skb, &tx);
1652 if (ret == IEEE80211_TX_FRAG_AGAIN)
1655 clear_bit(IEEE80211_LINK_STATE_PENDING,
1660 netif_tx_unlock_bh(dev);
1662 if (!ieee80211_qdisc_installed(dev)) {
1663 if (!__ieee80211_queue_stopped(local, 0))
1664 netif_wake_queue(dev);
1666 netif_schedule(dev);
1670 /* functions for drivers to get certain frames */
1672 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1673 struct ieee80211_if_ap *bss,
1674 struct sk_buff *skb,
1675 struct beacon_data *beacon)
1679 int i, have_bits = 0, n1, n2;
1681 /* Generate bitmap for TIM only if there are any STAs in power save
1683 read_lock_bh(&local->sta_lock);
1684 if (atomic_read(&bss->num_sta_ps) > 0)
1685 /* in the hope that this is faster than
1686 * checking byte-for-byte */
1687 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1688 IEEE80211_MAX_AID+1);
1690 if (bss->dtim_count == 0)
1691 bss->dtim_count = beacon->dtim_period - 1;
1695 tim = pos = (u8 *) skb_put(skb, 6);
1696 *pos++ = WLAN_EID_TIM;
1698 *pos++ = bss->dtim_count;
1699 *pos++ = beacon->dtim_period;
1701 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1705 /* Find largest even number N1 so that bits numbered 1 through
1706 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1707 * (N2 + 1) x 8 through 2007 are 0. */
1709 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1716 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1723 /* Bitmap control */
1725 /* Part Virt Bitmap */
1726 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1728 tim[1] = n2 - n1 + 4;
1729 skb_put(skb, n2 - n1);
1731 *pos++ = aid0; /* Bitmap control */
1732 *pos++ = 0; /* Part Virt Bitmap */
1734 read_unlock_bh(&local->sta_lock);
1737 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1738 struct ieee80211_vif *vif,
1739 struct ieee80211_tx_control *control)
1741 struct ieee80211_local *local = hw_to_local(hw);
1742 struct sk_buff *skb;
1743 struct net_device *bdev;
1744 struct ieee80211_sub_if_data *sdata = NULL;
1745 struct ieee80211_if_ap *ap = NULL;
1746 struct rate_selection rsel;
1747 struct beacon_data *beacon;
1748 struct ieee80211_supported_band *sband;
1750 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1754 sdata = vif_to_sdata(vif);
1758 beacon = rcu_dereference(ap->beacon);
1760 if (!ap || sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon) {
1761 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1762 if (net_ratelimit())
1763 printk(KERN_DEBUG "no beacon data avail for %s\n",
1765 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1770 /* headroom, head length, tail length and maximum TIM length */
1771 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
1772 beacon->tail_len + 256);
1776 skb_reserve(skb, local->tx_headroom);
1777 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1780 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1782 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1785 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
1789 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1791 if (net_ratelimit()) {
1792 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1794 wiphy_name(local->hw.wiphy));
1802 control->tx_rate = rsel.rate;
1803 if (sdata->bss_conf.use_short_preamble &&
1804 rsel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
1805 control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
1806 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1807 control->flags |= IEEE80211_TXCTL_NO_ACK;
1808 control->retry_limit = 1;
1809 control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT;
1818 EXPORT_SYMBOL(ieee80211_beacon_get);
1820 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1821 const void *frame, size_t frame_len,
1822 const struct ieee80211_tx_control *frame_txctl,
1823 struct ieee80211_rts *rts)
1825 const struct ieee80211_hdr *hdr = frame;
1828 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1829 rts->frame_control = cpu_to_le16(fctl);
1830 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1832 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1833 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1835 EXPORT_SYMBOL(ieee80211_rts_get);
1837 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1838 const void *frame, size_t frame_len,
1839 const struct ieee80211_tx_control *frame_txctl,
1840 struct ieee80211_cts *cts)
1842 const struct ieee80211_hdr *hdr = frame;
1845 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1846 cts->frame_control = cpu_to_le16(fctl);
1847 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1848 frame_len, frame_txctl);
1849 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1851 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1854 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1855 struct ieee80211_vif *vif,
1856 struct ieee80211_tx_control *control)
1858 struct ieee80211_local *local = hw_to_local(hw);
1859 struct sk_buff *skb;
1860 struct sta_info *sta;
1861 ieee80211_tx_handler *handler;
1862 struct ieee80211_txrx_data tx;
1863 ieee80211_tx_result res = TX_DROP;
1864 struct net_device *bdev;
1865 struct ieee80211_sub_if_data *sdata;
1866 struct ieee80211_if_ap *bss = NULL;
1867 struct beacon_data *beacon;
1869 sdata = vif_to_sdata(vif);
1877 beacon = rcu_dereference(bss->beacon);
1879 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1886 if (bss->dtim_count != 0)
1887 return NULL; /* send buffered bc/mc only after DTIM beacon */
1888 memset(control, 0, sizeof(*control));
1890 skb = skb_dequeue(&bss->ps_bc_buf);
1893 local->total_ps_buffered--;
1895 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1896 struct ieee80211_hdr *hdr =
1897 (struct ieee80211_hdr *) skb->data;
1898 /* more buffered multicast/broadcast frames ==> set
1899 * MoreData flag in IEEE 802.11 header to inform PS
1901 hdr->frame_control |=
1902 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1905 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1907 dev_kfree_skb_any(skb);
1910 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1911 tx.u.tx.channel = local->hw.conf.channel;
1913 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
1914 res = (*handler)(&tx);
1915 if (res == TX_DROP || res == TX_QUEUED)
1918 skb = tx.skb; /* handlers are allowed to change skb */
1920 if (res == TX_DROP) {
1921 I802_DEBUG_INC(local->tx_handlers_drop);
1924 } else if (res == TX_QUEUED) {
1925 I802_DEBUG_INC(local->tx_handlers_queued);
1934 EXPORT_SYMBOL(ieee80211_get_buffered_bc);