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_hw_mode *mode = tx->u.tx.mode;
97 erp = txrate->flags & IEEE80211_RATE_ERP;
100 * data and mgmt (except PS Poll):
101 * - during CFP: 32768
102 * - during contention period:
103 * if addr1 is group address: 0
104 * if more fragments = 0 and addr1 is individual address: time to
105 * transmit one ACK plus SIFS
106 * if more fragments = 1 and addr1 is individual address: time to
107 * transmit next fragment plus 2 x ACK plus 3 x SIFS
110 * - control response frame (CTS or ACK) shall be transmitted using the
111 * same rate as the immediately previous frame in the frame exchange
112 * sequence, if this rate belongs to the PHY mandatory rates, or else
113 * at the highest possible rate belonging to the PHY rates in the
117 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
118 /* TODO: These control frames are not currently sent by
119 * 80211.o, but should they be implemented, this function
120 * needs to be updated to support duration field calculation.
122 * RTS: time needed to transmit pending data/mgmt frame plus
123 * one CTS frame plus one ACK frame plus 3 x SIFS
124 * CTS: duration of immediately previous RTS minus time
125 * required to transmit CTS and its SIFS
126 * ACK: 0 if immediately previous directed data/mgmt had
127 * more=0, with more=1 duration in ACK frame is duration
128 * from previous frame minus time needed to transmit ACK
130 * PS Poll: BIT(15) | BIT(14) | aid
136 if (0 /* FIX: data/mgmt during CFP */)
139 if (group_addr) /* Group address as the destination - no ACK */
142 /* Individual destination address:
143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
144 * CTS and ACK frames shall be transmitted using the highest rate in
145 * basic rate set that is less than or equal to the rate of the
146 * immediately previous frame and that is using the same modulation
147 * (CCK or OFDM). If no basic rate set matches with these requirements,
148 * the highest mandatory rate of the PHY that is less than or equal to
149 * the rate of the previous frame is used.
150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
153 mrate = 10; /* use 1 Mbps if everything fails */
154 for (i = 0; i < mode->num_rates; i++) {
155 struct ieee80211_rate *r = &mode->rates[i];
156 if (r->rate > txrate->rate)
159 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
160 IEEE80211_RATE_MODULATION(r->flags))
163 if (r->flags & IEEE80211_RATE_BASIC)
165 else if (r->flags & IEEE80211_RATE_MANDATORY)
169 /* No matching basic rate found; use highest suitable mandatory
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
178 dur = ieee80211_frame_duration(local, 10, rate, erp,
179 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
186 dur += ieee80211_frame_duration(local, next_frag_len,
189 IEEE80211_SDATA_SHORT_PREAMBLE);
195 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
198 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
201 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
204 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
207 static int inline is_ieee80211_device(struct net_device *dev,
208 struct net_device *master)
210 return (wdev_priv(dev->ieee80211_ptr) ==
211 wdev_priv(master->ieee80211_ptr));
216 static ieee80211_txrx_result
217 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
219 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
220 struct sk_buff *skb = tx->skb;
221 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
222 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
225 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
226 return TXRX_CONTINUE;
228 if (unlikely(tx->local->sta_sw_scanning) &&
229 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
230 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
233 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
234 return TXRX_CONTINUE;
236 sta_flags = tx->sta ? tx->sta->flags : 0;
238 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
239 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
240 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
241 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
242 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
243 DECLARE_MAC_BUF(mac);
244 printk(KERN_DEBUG "%s: dropped data frame to not "
245 "associated station %s\n",
246 tx->dev->name, print_mac(mac, hdr->addr1));
247 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
248 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
252 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
253 tx->local->num_sta == 0 &&
254 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
256 * No associated STAs - no need to send multicast
261 return TXRX_CONTINUE;
264 return TXRX_CONTINUE;
267 static ieee80211_txrx_result
268 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
272 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
273 ieee80211_include_sequence(tx->sdata, hdr);
275 return TXRX_CONTINUE;
278 /* This function is called whenever the AP is about to exceed the maximum limit
279 * of buffered frames for power saving STAs. This situation should not really
280 * happen often during normal operation, so dropping the oldest buffered packet
281 * from each queue should be OK to make some room for new frames. */
282 static void purge_old_ps_buffers(struct ieee80211_local *local)
284 int total = 0, purged = 0;
286 struct ieee80211_sub_if_data *sdata;
287 struct sta_info *sta;
290 * virtual interfaces are protected by RCU
294 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
295 struct ieee80211_if_ap *ap;
296 if (sdata->dev == local->mdev ||
297 sdata->type != IEEE80211_IF_TYPE_AP)
300 skb = skb_dequeue(&ap->ps_bc_buf);
305 total += skb_queue_len(&ap->ps_bc_buf);
309 read_lock_bh(&local->sta_lock);
310 list_for_each_entry(sta, &local->sta_list, list) {
311 skb = skb_dequeue(&sta->ps_tx_buf);
316 total += skb_queue_len(&sta->ps_tx_buf);
318 read_unlock_bh(&local->sta_lock);
320 local->total_ps_buffered = total;
321 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
322 wiphy_name(local->hw.wiphy), purged);
325 static inline ieee80211_txrx_result
326 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
328 /* broadcast/multicast frame */
329 /* If any of the associated stations is in power save mode,
330 * the frame is buffered to be sent after DTIM beacon frame */
331 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
332 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
333 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
334 !(tx->fc & IEEE80211_FCTL_ORDER)) {
335 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
336 purge_old_ps_buffers(tx->local);
337 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
339 if (net_ratelimit()) {
340 printk(KERN_DEBUG "%s: BC TX buffer full - "
341 "dropping the oldest frame\n",
344 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
346 tx->local->total_ps_buffered++;
347 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
351 return TXRX_CONTINUE;
354 static inline ieee80211_txrx_result
355 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
357 struct sta_info *sta = tx->sta;
358 DECLARE_MAC_BUF(mac);
361 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
362 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
363 return TXRX_CONTINUE;
365 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
366 struct ieee80211_tx_packet_data *pkt_data;
367 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
368 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
370 print_mac(mac, sta->addr), sta->aid,
371 skb_queue_len(&sta->ps_tx_buf));
372 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
373 sta->flags |= WLAN_STA_TIM;
374 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
375 purge_old_ps_buffers(tx->local);
376 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
377 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
378 if (net_ratelimit()) {
379 printk(KERN_DEBUG "%s: STA %s TX "
380 "buffer full - dropping oldest frame\n",
381 tx->dev->name, print_mac(mac, sta->addr));
385 tx->local->total_ps_buffered++;
386 /* Queue frame to be sent after STA sends an PS Poll frame */
387 if (skb_queue_empty(&sta->ps_tx_buf)) {
388 if (tx->local->ops->set_tim)
389 tx->local->ops->set_tim(local_to_hw(tx->local),
392 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
394 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
395 pkt_data->jiffies = jiffies;
396 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
399 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
400 else if (unlikely(sta->flags & WLAN_STA_PS)) {
401 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
402 "set -> send frame\n", tx->dev->name,
403 print_mac(mac, sta->addr));
405 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
408 return TXRX_CONTINUE;
411 static ieee80211_txrx_result
412 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
414 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
415 return TXRX_CONTINUE;
417 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
418 return ieee80211_tx_h_unicast_ps_buf(tx);
420 return ieee80211_tx_h_multicast_ps_buf(tx);
423 static ieee80211_txrx_result
424 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
426 struct ieee80211_key *key;
427 const struct ieee80211_hdr *hdr;
430 hdr = (const struct ieee80211_hdr *) tx->skb->data;
431 fc = le16_to_cpu(hdr->frame_control);
433 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
435 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
437 else if ((key = rcu_dereference(tx->sdata->default_key)))
439 else if (tx->sdata->drop_unencrypted &&
440 !ieee80211_is_eapol(tx->skb, ieee80211_get_hdrlen(fc))) {
441 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
445 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
449 tx->key->tx_rx_count++;
450 /* TODO: add threshold stuff again */
453 return TXRX_CONTINUE;
456 static ieee80211_txrx_result
457 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
460 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
461 struct sk_buff **frags, *first, *frag;
465 int frag_threshold = tx->local->fragmentation_threshold;
467 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
468 return TXRX_CONTINUE;
472 hdrlen = ieee80211_get_hdrlen(tx->fc);
473 payload_len = first->len - hdrlen;
474 per_fragm = frag_threshold - hdrlen - FCS_LEN;
475 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
477 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
481 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
482 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
483 pos = first->data + hdrlen + per_fragm;
484 left = payload_len - per_fragm;
485 for (i = 0; i < num_fragm - 1; i++) {
486 struct ieee80211_hdr *fhdr;
492 /* reserve enough extra head and tail room for possible
495 dev_alloc_skb(tx->local->tx_headroom +
497 IEEE80211_ENCRYPT_HEADROOM +
498 IEEE80211_ENCRYPT_TAILROOM);
501 /* Make sure that all fragments use the same priority so
502 * that they end up using the same TX queue */
503 frag->priority = first->priority;
504 skb_reserve(frag, tx->local->tx_headroom +
505 IEEE80211_ENCRYPT_HEADROOM);
506 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
507 memcpy(fhdr, first->data, hdrlen);
508 if (i == num_fragm - 2)
509 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
510 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
511 copylen = left > per_fragm ? per_fragm : left;
512 memcpy(skb_put(frag, copylen), pos, copylen);
517 skb_trim(first, hdrlen + per_fragm);
519 tx->u.tx.num_extra_frag = num_fragm - 1;
520 tx->u.tx.extra_frag = frags;
522 return TXRX_CONTINUE;
525 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
527 for (i = 0; i < num_fragm - 1; i++)
529 dev_kfree_skb(frags[i]);
532 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
536 static ieee80211_txrx_result
537 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
540 return TXRX_CONTINUE;
542 switch (tx->key->conf.alg) {
544 return ieee80211_crypto_wep_encrypt(tx);
546 return ieee80211_crypto_tkip_encrypt(tx);
548 return ieee80211_crypto_ccmp_encrypt(tx);
556 static ieee80211_txrx_result
557 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
559 struct rate_selection rsel;
561 if (likely(!tx->u.tx.rate)) {
562 rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel);
563 tx->u.tx.rate = rsel.rate;
564 if (unlikely(rsel.probe != NULL)) {
565 tx->u.tx.control->flags |=
566 IEEE80211_TXCTL_RATE_CTRL_PROBE;
567 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
568 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
569 tx->u.tx.rate = rsel.probe;
571 tx->u.tx.control->alt_retry_rate = -1;
576 tx->u.tx.control->alt_retry_rate = -1;
578 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
579 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
580 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
581 tx->u.tx.last_frag_rate = tx->u.tx.rate;
583 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
585 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
586 tx->u.tx.rate = rsel.nonerp;
587 tx->u.tx.control->rate = rsel.nonerp;
588 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
590 tx->u.tx.last_frag_rate = tx->u.tx.rate;
591 tx->u.tx.control->rate = tx->u.tx.rate;
593 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
595 return TXRX_CONTINUE;
598 static ieee80211_txrx_result
599 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
601 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
602 u16 fc = le16_to_cpu(hdr->frame_control);
604 struct ieee80211_tx_control *control = tx->u.tx.control;
605 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
607 if (!control->retry_limit) {
608 if (!is_multicast_ether_addr(hdr->addr1)) {
609 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
610 && tx->local->rts_threshold <
611 IEEE80211_MAX_RTS_THRESHOLD) {
613 IEEE80211_TXCTL_USE_RTS_CTS;
615 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
616 control->retry_limit =
617 tx->local->long_retry_limit;
619 control->retry_limit =
620 tx->local->short_retry_limit;
623 control->retry_limit = 1;
627 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
628 /* Do not use multiple retry rates when sending fragmented
630 * TODO: The last fragment could still use multiple retry
632 control->alt_retry_rate = -1;
635 /* Use CTS protection for unicast frames sent using extended rates if
636 * there are associated non-ERP stations and RTS/CTS is not configured
638 if (mode->mode == MODE_IEEE80211G &&
639 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
640 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
641 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
642 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
643 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
645 /* Transmit data frames using short preambles if the driver supports
646 * short preambles at the selected rate and short preambles are
647 * available on the network at the current point in time. */
648 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
649 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
650 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
651 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
652 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
655 /* Setup duration field for the first fragment of the frame. Duration
656 * for remaining fragments will be updated when they are being sent
657 * to low-level driver in ieee80211_tx(). */
658 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
659 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
660 tx->u.tx.extra_frag[0]->len : 0);
661 hdr->duration_id = cpu_to_le16(dur);
663 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
664 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
665 struct ieee80211_rate *rate;
667 /* Do not use multiple retry rates when using RTS/CTS */
668 control->alt_retry_rate = -1;
670 /* Use min(data rate, max base rate) as CTS/RTS rate */
671 rate = tx->u.tx.rate;
672 while (rate > mode->rates &&
673 !(rate->flags & IEEE80211_RATE_BASIC))
676 control->rts_cts_rate = rate->val;
677 control->rts_rate = rate;
681 tx->sta->tx_packets++;
682 tx->sta->tx_fragments++;
683 tx->sta->tx_bytes += tx->skb->len;
684 if (tx->u.tx.extra_frag) {
686 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
687 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
689 tx->u.tx.extra_frag[i]->len;
695 * Tell hardware to not encrypt when we had sw crypto.
696 * Because we use the same flag to internally indicate that
697 * no (software) encryption should be done, we have to set it
698 * after all crypto handlers.
700 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
701 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
703 return TXRX_CONTINUE;
706 static ieee80211_txrx_result
707 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
709 struct ieee80211_local *local = tx->local;
710 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
711 struct sk_buff *skb = tx->skb;
712 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
713 u32 load = 0, hdrtime;
715 /* TODO: this could be part of tx_status handling, so that the number
716 * of retries would be known; TX rate should in that case be stored
717 * somewhere with the packet */
719 /* Estimate total channel use caused by this frame */
721 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
722 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
724 if (mode->mode == MODE_IEEE80211A ||
725 (mode->mode == MODE_IEEE80211G &&
726 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
727 hdrtime = CHAN_UTIL_HDR_SHORT;
729 hdrtime = CHAN_UTIL_HDR_LONG;
732 if (!is_multicast_ether_addr(hdr->addr1))
735 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
737 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
740 load += skb->len * tx->u.tx.rate->rate_inv;
742 if (tx->u.tx.extra_frag) {
744 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
746 load += tx->u.tx.extra_frag[i]->len *
751 /* Divide channel_use by 8 to avoid wrapping around the counter */
752 load >>= CHAN_UTIL_SHIFT;
753 local->channel_use_raw += load;
755 tx->sta->channel_use_raw += load;
756 tx->sdata->channel_use_raw += load;
758 return TXRX_CONTINUE;
761 /* TODO: implement register/unregister functions for adding TX/RX handlers
762 * into ordered list */
764 ieee80211_tx_handler ieee80211_tx_handlers[] =
766 ieee80211_tx_h_check_assoc,
767 ieee80211_tx_h_sequence,
768 ieee80211_tx_h_ps_buf,
769 ieee80211_tx_h_select_key,
770 ieee80211_tx_h_michael_mic_add,
771 ieee80211_tx_h_fragment,
772 ieee80211_tx_h_encrypt,
773 ieee80211_tx_h_rate_ctrl,
775 ieee80211_tx_h_load_stats,
779 /* actual transmit path */
782 * deal with packet injection down monitor interface
783 * with Radiotap Header -- only called for monitor mode interface
785 static ieee80211_txrx_result
786 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
790 * this is the moment to interpret and discard the radiotap header that
791 * must be at the start of the packet injected in Monitor mode
793 * Need to take some care with endian-ness since radiotap
794 * args are little-endian
797 struct ieee80211_radiotap_iterator iterator;
798 struct ieee80211_radiotap_header *rthdr =
799 (struct ieee80211_radiotap_header *) skb->data;
800 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
801 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
802 struct ieee80211_tx_control *control = tx->u.tx.control;
804 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
805 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
806 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
809 * for every radiotap entry that is present
810 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
811 * entries present, or -EINVAL on error)
817 ret = ieee80211_radiotap_iterator_next(&iterator);
822 /* see if this argument is something we can use */
823 switch (iterator.this_arg_index) {
825 * You must take care when dereferencing iterator.this_arg
826 * for multibyte types... the pointer is not aligned. Use
827 * get_unaligned((type *)iterator.this_arg) to dereference
828 * iterator.this_arg for type "type" safely on all arches.
830 case IEEE80211_RADIOTAP_RATE:
832 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
833 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
835 target_rate = (*iterator.this_arg) * 5;
836 for (i = 0; i < mode->num_rates; i++) {
837 struct ieee80211_rate *r = &mode->rates[i];
839 if (r->rate == target_rate) {
846 case IEEE80211_RADIOTAP_ANTENNA:
848 * radiotap uses 0 for 1st ant, mac80211 is 1 for
851 control->antenna_sel_tx = (*iterator.this_arg) + 1;
854 case IEEE80211_RADIOTAP_DBM_TX_POWER:
855 control->power_level = *iterator.this_arg;
858 case IEEE80211_RADIOTAP_FLAGS:
859 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
861 * this indicates that the skb we have been
862 * handed has the 32-bit FCS CRC at the end...
863 * we should react to that by snipping it off
864 * because it will be recomputed and added
867 if (skb->len < (iterator.max_length + FCS_LEN))
870 skb_trim(skb, skb->len - FCS_LEN);
872 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
874 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
875 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
876 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
880 * Please update the file
881 * Documentation/networking/mac80211-injection.txt
882 * when parsing new fields here.
890 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
894 * remove the radiotap header
895 * iterator->max_length was sanity-checked against
896 * skb->len by iterator init
898 skb_pull(skb, iterator.max_length);
900 return TXRX_CONTINUE;
906 static ieee80211_txrx_result
907 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
909 struct net_device *dev,
910 struct ieee80211_tx_control *control)
912 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
913 struct ieee80211_hdr *hdr;
914 struct ieee80211_sub_if_data *sdata;
915 ieee80211_txrx_result res = TXRX_CONTINUE;
919 memset(tx, 0, sizeof(*tx));
921 tx->dev = dev; /* use original interface */
923 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
924 tx->u.tx.control = control;
926 * Set this flag (used below to indicate "automatic fragmentation"),
927 * it will be cleared/left by radiotap as desired.
929 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
931 /* process and remove the injection radiotap header */
932 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
933 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
934 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
938 * __ieee80211_parse_tx_radiotap has now removed
939 * the radiotap header that was present and pre-filled
940 * 'tx' with tx control information.
944 hdr = (struct ieee80211_hdr *) skb->data;
946 tx->sta = sta_info_get(local, hdr->addr1);
947 tx->fc = le16_to_cpu(hdr->frame_control);
949 if (is_multicast_ether_addr(hdr->addr1)) {
950 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
951 control->flags |= IEEE80211_TXCTL_NO_ACK;
953 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
954 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
957 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
958 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
959 skb->len + FCS_LEN > local->fragmentation_threshold &&
960 !local->ops->set_frag_threshold)
961 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
963 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
967 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
968 else if (tx->sta->clear_dst_mask) {
969 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
970 tx->sta->clear_dst_mask = 0;
973 hdrlen = ieee80211_get_hdrlen(tx->fc);
974 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
975 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
976 tx->ethertype = (pos[0] << 8) | pos[1];
978 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
983 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
986 * NB: @tx is uninitialised when passed in here
988 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
990 struct net_device *mdev,
991 struct ieee80211_tx_control *control)
993 struct ieee80211_tx_packet_data *pkt_data;
994 struct net_device *dev;
996 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
997 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
998 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1004 /* initialises tx with control */
1005 __ieee80211_tx_prepare(tx, skb, dev, control);
1009 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1010 struct ieee80211_txrx_data *tx)
1012 struct ieee80211_tx_control *control = tx->u.tx.control;
1015 if (!ieee80211_qdisc_installed(local->mdev) &&
1016 __ieee80211_queue_stopped(local, 0)) {
1017 netif_stop_queue(local->mdev);
1018 return IEEE80211_TX_AGAIN;
1021 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1022 "TX to low-level driver", skb);
1023 ret = local->ops->tx(local_to_hw(local), skb, control);
1025 return IEEE80211_TX_AGAIN;
1026 local->mdev->trans_start = jiffies;
1027 ieee80211_led_tx(local, 1);
1029 if (tx->u.tx.extra_frag) {
1030 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1031 IEEE80211_TXCTL_USE_CTS_PROTECT |
1032 IEEE80211_TXCTL_CLEAR_DST_MASK |
1033 IEEE80211_TXCTL_FIRST_FRAGMENT);
1034 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1035 if (!tx->u.tx.extra_frag[i])
1037 if (__ieee80211_queue_stopped(local, control->queue))
1038 return IEEE80211_TX_FRAG_AGAIN;
1039 if (i == tx->u.tx.num_extra_frag) {
1040 control->tx_rate = tx->u.tx.last_frag_hwrate;
1041 control->rate = tx->u.tx.last_frag_rate;
1042 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1044 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1047 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1050 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1051 "TX to low-level driver",
1052 tx->u.tx.extra_frag[i]);
1053 ret = local->ops->tx(local_to_hw(local),
1054 tx->u.tx.extra_frag[i],
1057 return IEEE80211_TX_FRAG_AGAIN;
1058 local->mdev->trans_start = jiffies;
1059 ieee80211_led_tx(local, 1);
1060 tx->u.tx.extra_frag[i] = NULL;
1062 kfree(tx->u.tx.extra_frag);
1063 tx->u.tx.extra_frag = NULL;
1065 return IEEE80211_TX_OK;
1068 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1069 struct ieee80211_tx_control *control)
1071 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1072 struct sta_info *sta;
1073 ieee80211_tx_handler *handler;
1074 struct ieee80211_txrx_data tx;
1075 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1078 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1080 if (unlikely(skb->len < 10)) {
1085 /* initialises tx */
1086 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1088 if (res_prepare == TXRX_DROP) {
1094 * key references are protected using RCU and this requires that
1095 * we are in a read-site RCU section during receive processing
1100 tx.u.tx.mode = local->hw.conf.mode;
1102 for (handler = local->tx_handlers; *handler != NULL;
1104 res = (*handler)(&tx);
1105 if (res != TXRX_CONTINUE)
1109 skb = tx.skb; /* handlers are allowed to change skb */
1114 if (unlikely(res == TXRX_DROP)) {
1115 I802_DEBUG_INC(local->tx_handlers_drop);
1119 if (unlikely(res == TXRX_QUEUED)) {
1120 I802_DEBUG_INC(local->tx_handlers_queued);
1125 if (tx.u.tx.extra_frag) {
1126 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1128 struct ieee80211_hdr *hdr =
1129 (struct ieee80211_hdr *)
1130 tx.u.tx.extra_frag[i]->data;
1132 if (i + 1 < tx.u.tx.num_extra_frag) {
1133 next_len = tx.u.tx.extra_frag[i + 1]->len;
1136 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1137 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1139 dur = ieee80211_duration(&tx, 0, next_len);
1140 hdr->duration_id = cpu_to_le16(dur);
1145 ret = __ieee80211_tx(local, skb, &tx);
1147 struct ieee80211_tx_stored_packet *store =
1148 &local->pending_packet[control->queue];
1150 if (ret == IEEE80211_TX_FRAG_AGAIN)
1152 set_bit(IEEE80211_LINK_STATE_PENDING,
1153 &local->state[control->queue]);
1155 /* When the driver gets out of buffers during sending of
1156 * fragments and calls ieee80211_stop_queue, there is
1157 * a small window between IEEE80211_LINK_STATE_XOFF and
1158 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1159 * gets available in that window (i.e. driver calls
1160 * ieee80211_wake_queue), we would end up with ieee80211_tx
1161 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1162 * continuing transmitting here when that situation is
1163 * possible to have happened. */
1164 if (!__ieee80211_queue_stopped(local, control->queue)) {
1165 clear_bit(IEEE80211_LINK_STATE_PENDING,
1166 &local->state[control->queue]);
1169 memcpy(&store->control, control,
1170 sizeof(struct ieee80211_tx_control));
1172 store->extra_frag = tx.u.tx.extra_frag;
1173 store->num_extra_frag = tx.u.tx.num_extra_frag;
1174 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1175 store->last_frag_rate = tx.u.tx.last_frag_rate;
1176 store->last_frag_rate_ctrl_probe =
1177 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1185 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1186 if (tx.u.tx.extra_frag[i])
1187 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1188 kfree(tx.u.tx.extra_frag);
1193 /* device xmit handlers */
1195 int ieee80211_master_start_xmit(struct sk_buff *skb,
1196 struct net_device *dev)
1198 struct ieee80211_tx_control control;
1199 struct ieee80211_tx_packet_data *pkt_data;
1200 struct net_device *odev = NULL;
1201 struct ieee80211_sub_if_data *osdata;
1206 * copy control out of the skb so other people can use skb->cb
1208 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1209 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1211 if (pkt_data->ifindex)
1212 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1213 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1217 if (unlikely(!odev)) {
1218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1219 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1220 "originating device\n", dev->name);
1225 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1227 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1228 if (skb_headroom(skb) < headroom) {
1229 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1236 control.ifindex = odev->ifindex;
1237 control.type = osdata->type;
1238 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1239 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1240 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1241 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1242 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1243 control.flags |= IEEE80211_TXCTL_REQUEUE;
1244 control.queue = pkt_data->queue;
1246 ret = ieee80211_tx(odev, skb, &control);
1252 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1253 struct net_device *dev)
1255 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1256 struct ieee80211_tx_packet_data *pkt_data;
1257 struct ieee80211_radiotap_header *prthdr =
1258 (struct ieee80211_radiotap_header *)skb->data;
1261 /* check for not even having the fixed radiotap header part */
1262 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1263 goto fail; /* too short to be possibly valid */
1265 /* is it a header version we can trust to find length from? */
1266 if (unlikely(prthdr->it_version))
1267 goto fail; /* only version 0 is supported */
1269 /* then there must be a radiotap header with a length we can use */
1270 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1272 /* does the skb contain enough to deliver on the alleged length? */
1273 if (unlikely(skb->len < len_rthdr))
1274 goto fail; /* skb too short for claimed rt header extent */
1276 skb->dev = local->mdev;
1278 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1279 memset(pkt_data, 0, sizeof(*pkt_data));
1280 /* needed because we set skb device to master */
1281 pkt_data->ifindex = dev->ifindex;
1283 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1286 * fix up the pointers accounting for the radiotap
1287 * header still being in there. We are being given
1288 * a precooked IEEE80211 header so no need for
1291 skb_set_mac_header(skb, len_rthdr);
1293 * these are just fixed to the end of the rt area since we
1294 * don't have any better information and at this point, nobody cares
1296 skb_set_network_header(skb, len_rthdr);
1297 skb_set_transport_header(skb, len_rthdr);
1299 /* pass the radiotap header up to the next stage intact */
1300 dev_queue_xmit(skb);
1301 return NETDEV_TX_OK;
1305 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1309 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1310 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1311 * @skb: packet to be sent
1312 * @dev: incoming interface
1314 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1315 * not be freed, and caller is responsible for either retrying later or freeing
1318 * This function takes in an Ethernet header and encapsulates it with suitable
1319 * IEEE 802.11 header based on which interface the packet is coming in. The
1320 * encapsulated packet will then be passed to master interface, wlan#.11, for
1321 * transmission (through low-level driver).
1323 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1324 struct net_device *dev)
1326 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1327 struct ieee80211_tx_packet_data *pkt_data;
1328 struct ieee80211_sub_if_data *sdata;
1329 int ret = 1, head_need;
1330 u16 ethertype, hdrlen, fc;
1331 struct ieee80211_hdr hdr;
1332 const u8 *encaps_data;
1333 int encaps_len, skip_header_bytes;
1335 struct sta_info *sta;
1338 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1339 if (unlikely(skb->len < ETH_HLEN)) {
1340 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1341 dev->name, skb->len);
1346 nh_pos = skb_network_header(skb) - skb->data;
1347 h_pos = skb_transport_header(skb) - skb->data;
1349 /* convert Ethernet header to proper 802.11 header (based on
1350 * operation mode) */
1351 ethertype = (skb->data[12] << 8) | skb->data[13];
1352 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1354 switch (sdata->type) {
1355 case IEEE80211_IF_TYPE_AP:
1356 case IEEE80211_IF_TYPE_VLAN:
1357 fc |= IEEE80211_FCTL_FROMDS;
1359 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1360 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1361 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1364 case IEEE80211_IF_TYPE_WDS:
1365 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1367 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1368 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1369 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1370 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1373 case IEEE80211_IF_TYPE_STA:
1374 fc |= IEEE80211_FCTL_TODS;
1376 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1377 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1378 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1381 case IEEE80211_IF_TYPE_IBSS:
1383 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1384 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1385 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1393 sta = sta_info_get(local, hdr.addr1);
1395 sta_flags = sta->flags;
1399 /* receiver is QoS enabled, use a QoS type frame */
1400 if (sta_flags & WLAN_STA_WME) {
1401 fc |= IEEE80211_STYPE_QOS_DATA;
1406 * If port access control is enabled, drop frames to unauthorised
1407 * stations unless they are EAPOL frames from the local station.
1409 if (unlikely(sdata->ieee802_1x_pac &&
1410 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1411 !(ethertype == ETH_P_PAE &&
1412 compare_ether_addr(dev->dev_addr,
1413 skb->data + ETH_ALEN) == 0))) {
1414 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1415 DECLARE_MAC_BUF(mac);
1417 if (net_ratelimit())
1418 printk(KERN_DEBUG "%s: dropped frame to %s"
1419 " (unauthorized port)\n", dev->name,
1420 print_mac(mac, hdr.addr1));
1423 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1429 hdr.frame_control = cpu_to_le16(fc);
1430 hdr.duration_id = 0;
1433 skip_header_bytes = ETH_HLEN;
1434 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1435 encaps_data = bridge_tunnel_header;
1436 encaps_len = sizeof(bridge_tunnel_header);
1437 skip_header_bytes -= 2;
1438 } else if (ethertype >= 0x600) {
1439 encaps_data = rfc1042_header;
1440 encaps_len = sizeof(rfc1042_header);
1441 skip_header_bytes -= 2;
1447 skb_pull(skb, skip_header_bytes);
1448 nh_pos -= skip_header_bytes;
1449 h_pos -= skip_header_bytes;
1451 /* TODO: implement support for fragments so that there is no need to
1452 * reallocate and copy payload; it might be enough to support one
1453 * extra fragment that would be copied in the beginning of the frame
1454 * data.. anyway, it would be nice to include this into skb structure
1457 * There are few options for this:
1458 * use skb->cb as an extra space for 802.11 header
1459 * allocate new buffer if not enough headroom
1460 * make sure that there is enough headroom in every skb by increasing
1461 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1462 * alloc_skb() (net/core/skbuff.c)
1464 head_need = hdrlen + encaps_len + local->tx_headroom;
1465 head_need -= skb_headroom(skb);
1467 /* We are going to modify skb data, so make a copy of it if happens to
1468 * be cloned. This could happen, e.g., with Linux bridge code passing
1469 * us broadcast frames. */
1471 if (head_need > 0 || skb_cloned(skb)) {
1473 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1474 "of headroom\n", dev->name, head_need);
1477 if (skb_cloned(skb))
1478 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1480 I802_DEBUG_INC(local->tx_expand_skb_head);
1481 /* Since we have to reallocate the buffer, make sure that there
1482 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1483 * before payload and 12 after). */
1484 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1486 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1493 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1494 nh_pos += encaps_len;
1495 h_pos += encaps_len;
1498 if (fc & IEEE80211_STYPE_QOS_DATA) {
1499 __le16 *qos_control;
1501 qos_control = (__le16*) skb_push(skb, 2);
1502 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1504 * Maybe we could actually set some fields here, for now just
1505 * initialise to zero to indicate no special operation.
1509 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1514 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1515 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1516 pkt_data->ifindex = dev->ifindex;
1518 skb->dev = local->mdev;
1519 dev->stats.tx_packets++;
1520 dev->stats.tx_bytes += skb->len;
1522 /* Update skb pointers to various headers since this modified frame
1523 * is going to go through Linux networking code that may potentially
1524 * need things like pointer to IP header. */
1525 skb_set_mac_header(skb, 0);
1526 skb_set_network_header(skb, nh_pos);
1527 skb_set_transport_header(skb, h_pos);
1529 dev->trans_start = jiffies;
1530 dev_queue_xmit(skb);
1541 /* helper functions for pending packets for when queues are stopped */
1543 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1546 struct ieee80211_tx_stored_packet *store;
1548 for (i = 0; i < local->hw.queues; i++) {
1549 if (!__ieee80211_queue_pending(local, i))
1551 store = &local->pending_packet[i];
1552 kfree_skb(store->skb);
1553 for (j = 0; j < store->num_extra_frag; j++)
1554 kfree_skb(store->extra_frag[j]);
1555 kfree(store->extra_frag);
1556 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1560 void ieee80211_tx_pending(unsigned long data)
1562 struct ieee80211_local *local = (struct ieee80211_local *)data;
1563 struct net_device *dev = local->mdev;
1564 struct ieee80211_tx_stored_packet *store;
1565 struct ieee80211_txrx_data tx;
1566 int i, ret, reschedule = 0;
1568 netif_tx_lock_bh(dev);
1569 for (i = 0; i < local->hw.queues; i++) {
1570 if (__ieee80211_queue_stopped(local, i))
1572 if (!__ieee80211_queue_pending(local, i)) {
1576 store = &local->pending_packet[i];
1577 tx.u.tx.control = &store->control;
1578 tx.u.tx.extra_frag = store->extra_frag;
1579 tx.u.tx.num_extra_frag = store->num_extra_frag;
1580 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1581 tx.u.tx.last_frag_rate = store->last_frag_rate;
1583 if (store->last_frag_rate_ctrl_probe)
1584 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1585 ret = __ieee80211_tx(local, store->skb, &tx);
1587 if (ret == IEEE80211_TX_FRAG_AGAIN)
1590 clear_bit(IEEE80211_LINK_STATE_PENDING,
1595 netif_tx_unlock_bh(dev);
1597 if (!ieee80211_qdisc_installed(dev)) {
1598 if (!__ieee80211_queue_stopped(local, 0))
1599 netif_wake_queue(dev);
1601 netif_schedule(dev);
1605 /* functions for drivers to get certain frames */
1607 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1608 struct ieee80211_if_ap *bss,
1609 struct sk_buff *skb)
1613 int i, have_bits = 0, n1, n2;
1615 /* Generate bitmap for TIM only if there are any STAs in power save
1617 read_lock_bh(&local->sta_lock);
1618 if (atomic_read(&bss->num_sta_ps) > 0)
1619 /* in the hope that this is faster than
1620 * checking byte-for-byte */
1621 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1622 IEEE80211_MAX_AID+1);
1624 if (bss->dtim_count == 0)
1625 bss->dtim_count = bss->dtim_period - 1;
1629 tim = pos = (u8 *) skb_put(skb, 6);
1630 *pos++ = WLAN_EID_TIM;
1632 *pos++ = bss->dtim_count;
1633 *pos++ = bss->dtim_period;
1635 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1639 /* Find largest even number N1 so that bits numbered 1 through
1640 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1641 * (N2 + 1) x 8 through 2007 are 0. */
1643 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1650 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1657 /* Bitmap control */
1659 /* Part Virt Bitmap */
1660 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1662 tim[1] = n2 - n1 + 4;
1663 skb_put(skb, n2 - n1);
1665 *pos++ = aid0; /* Bitmap control */
1666 *pos++ = 0; /* Part Virt Bitmap */
1668 read_unlock_bh(&local->sta_lock);
1671 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1672 struct ieee80211_tx_control *control)
1674 struct ieee80211_local *local = hw_to_local(hw);
1675 struct sk_buff *skb;
1676 struct net_device *bdev;
1677 struct ieee80211_sub_if_data *sdata = NULL;
1678 struct ieee80211_if_ap *ap = NULL;
1679 struct rate_selection rsel;
1680 u8 *b_head, *b_tail;
1683 bdev = dev_get_by_index(&init_net, if_id);
1685 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1690 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1692 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1693 if (net_ratelimit())
1694 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1695 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1696 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1700 /* Assume we are generating the normal beacon locally */
1701 b_head = ap->beacon_head;
1702 b_tail = ap->beacon_tail;
1703 bh_len = ap->beacon_head_len;
1704 bt_len = ap->beacon_tail_len;
1706 skb = dev_alloc_skb(local->tx_headroom +
1707 bh_len + bt_len + 256 /* maximum TIM len */);
1711 skb_reserve(skb, local->tx_headroom);
1712 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1714 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1716 ieee80211_beacon_add_tim(local, ap, skb);
1719 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1723 rate_control_get_rate(local->mdev, local->oper_hw_mode, skb,
1726 if (net_ratelimit()) {
1727 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1729 wiphy_name(local->hw.wiphy));
1736 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1737 (rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1738 rsel.rate->val2 : rsel.rate->val;
1739 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1740 control->power_level = local->hw.conf.power_level;
1741 control->flags |= IEEE80211_TXCTL_NO_ACK;
1742 control->retry_limit = 1;
1743 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1749 EXPORT_SYMBOL(ieee80211_beacon_get);
1751 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1752 const void *frame, size_t frame_len,
1753 const struct ieee80211_tx_control *frame_txctl,
1754 struct ieee80211_rts *rts)
1756 const struct ieee80211_hdr *hdr = frame;
1759 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1760 rts->frame_control = cpu_to_le16(fctl);
1761 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1762 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1763 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1765 EXPORT_SYMBOL(ieee80211_rts_get);
1767 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1768 const void *frame, size_t frame_len,
1769 const struct ieee80211_tx_control *frame_txctl,
1770 struct ieee80211_cts *cts)
1772 const struct ieee80211_hdr *hdr = frame;
1775 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1776 cts->frame_control = cpu_to_le16(fctl);
1777 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1778 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1780 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1783 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1784 struct ieee80211_tx_control *control)
1786 struct ieee80211_local *local = hw_to_local(hw);
1787 struct sk_buff *skb;
1788 struct sta_info *sta;
1789 ieee80211_tx_handler *handler;
1790 struct ieee80211_txrx_data tx;
1791 ieee80211_txrx_result res = TXRX_DROP;
1792 struct net_device *bdev;
1793 struct ieee80211_sub_if_data *sdata;
1794 struct ieee80211_if_ap *bss = NULL;
1796 bdev = dev_get_by_index(&init_net, if_id);
1798 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1802 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1805 if (bss->dtim_count != 0)
1806 return NULL; /* send buffered bc/mc only after DTIM beacon */
1807 memset(control, 0, sizeof(*control));
1809 skb = skb_dequeue(&bss->ps_bc_buf);
1812 local->total_ps_buffered--;
1814 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1815 struct ieee80211_hdr *hdr =
1816 (struct ieee80211_hdr *) skb->data;
1817 /* more buffered multicast/broadcast frames ==> set
1818 * MoreData flag in IEEE 802.11 header to inform PS
1820 hdr->frame_control |=
1821 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1824 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1826 dev_kfree_skb_any(skb);
1829 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1830 tx.u.tx.mode = local->hw.conf.mode;
1832 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1833 res = (*handler)(&tx);
1834 if (res == TXRX_DROP || res == TXRX_QUEUED)
1838 skb = tx.skb; /* handlers are allowed to change skb */
1840 if (res == TXRX_DROP) {
1841 I802_DEBUG_INC(local->tx_handlers_drop);
1844 } else if (res == TXRX_QUEUED) {
1845 I802_DEBUG_INC(local->tx_handlers_queued);
1854 EXPORT_SYMBOL(ieee80211_get_buffered_bc);