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->local->sta_scanning != 0) &&
226 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
227 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
230 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
231 return TXRX_CONTINUE;
233 sta_flags = tx->sta ? tx->sta->flags : 0;
235 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
236 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
237 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
238 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
239 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
240 DECLARE_MAC_BUF(mac);
241 printk(KERN_DEBUG "%s: dropped data frame to not "
242 "associated station %s\n",
243 tx->dev->name, print_mac(mac, hdr->addr1));
244 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
245 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
249 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
250 tx->local->num_sta == 0 &&
251 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
253 * No associated STAs - no need to send multicast
258 return TXRX_CONTINUE;
261 if (unlikely(/* !injected && */ tx->sdata->ieee802_1x &&
262 !(sta_flags & WLAN_STA_AUTHORIZED))) {
263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
264 DECLARE_MAC_BUF(mac);
265 printk(KERN_DEBUG "%s: dropped frame to %s"
266 " (unauthorized port)\n", tx->dev->name,
267 print_mac(mac, hdr->addr1));
269 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
273 return TXRX_CONTINUE;
276 static ieee80211_txrx_result
277 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
279 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
281 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
282 ieee80211_include_sequence(tx->sdata, hdr);
284 return TXRX_CONTINUE;
287 /* This function is called whenever the AP is about to exceed the maximum limit
288 * of buffered frames for power saving STAs. This situation should not really
289 * happen often during normal operation, so dropping the oldest buffered packet
290 * from each queue should be OK to make some room for new frames. */
291 static void purge_old_ps_buffers(struct ieee80211_local *local)
293 int total = 0, purged = 0;
295 struct ieee80211_sub_if_data *sdata;
296 struct sta_info *sta;
299 * virtual interfaces are protected by RCU
303 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
304 struct ieee80211_if_ap *ap;
305 if (sdata->dev == local->mdev ||
306 sdata->type != IEEE80211_IF_TYPE_AP)
309 skb = skb_dequeue(&ap->ps_bc_buf);
314 total += skb_queue_len(&ap->ps_bc_buf);
318 read_lock_bh(&local->sta_lock);
319 list_for_each_entry(sta, &local->sta_list, list) {
320 skb = skb_dequeue(&sta->ps_tx_buf);
325 total += skb_queue_len(&sta->ps_tx_buf);
327 read_unlock_bh(&local->sta_lock);
329 local->total_ps_buffered = total;
330 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
331 wiphy_name(local->hw.wiphy), purged);
334 static inline ieee80211_txrx_result
335 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
337 /* broadcast/multicast frame */
338 /* If any of the associated stations is in power save mode,
339 * the frame is buffered to be sent after DTIM beacon frame */
340 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
341 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
342 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
343 !(tx->fc & IEEE80211_FCTL_ORDER)) {
344 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
345 purge_old_ps_buffers(tx->local);
346 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
348 if (net_ratelimit()) {
349 printk(KERN_DEBUG "%s: BC TX buffer full - "
350 "dropping the oldest frame\n",
353 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
355 tx->local->total_ps_buffered++;
356 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
360 return TXRX_CONTINUE;
363 static inline ieee80211_txrx_result
364 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
366 struct sta_info *sta = tx->sta;
367 DECLARE_MAC_BUF(mac);
370 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
371 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
372 return TXRX_CONTINUE;
374 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
375 struct ieee80211_tx_packet_data *pkt_data;
376 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
377 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
379 print_mac(mac, sta->addr), sta->aid,
380 skb_queue_len(&sta->ps_tx_buf));
381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
382 sta->flags |= WLAN_STA_TIM;
383 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
384 purge_old_ps_buffers(tx->local);
385 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
386 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
387 if (net_ratelimit()) {
388 printk(KERN_DEBUG "%s: STA %s TX "
389 "buffer full - dropping oldest frame\n",
390 tx->dev->name, print_mac(mac, sta->addr));
394 tx->local->total_ps_buffered++;
395 /* Queue frame to be sent after STA sends an PS Poll frame */
396 if (skb_queue_empty(&sta->ps_tx_buf)) {
397 if (tx->local->ops->set_tim)
398 tx->local->ops->set_tim(local_to_hw(tx->local),
401 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
403 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
404 pkt_data->jiffies = jiffies;
405 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
408 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
409 else if (unlikely(sta->flags & WLAN_STA_PS)) {
410 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
411 "set -> send frame\n", tx->dev->name,
412 print_mac(mac, sta->addr));
414 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
417 return TXRX_CONTINUE;
421 static ieee80211_txrx_result
422 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
424 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
425 return TXRX_CONTINUE;
427 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
428 return ieee80211_tx_h_unicast_ps_buf(tx);
430 return ieee80211_tx_h_multicast_ps_buf(tx);
436 static ieee80211_txrx_result
437 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
439 struct ieee80211_key *key;
441 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
443 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
445 else if ((key = rcu_dereference(tx->sdata->default_key)))
447 else if (tx->sdata->drop_unencrypted &&
448 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
449 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
453 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
457 tx->key->tx_rx_count++;
458 /* TODO: add threshold stuff again */
461 return TXRX_CONTINUE;
464 static ieee80211_txrx_result
465 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
467 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
468 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
469 struct sk_buff **frags, *first, *frag;
473 int frag_threshold = tx->local->fragmentation_threshold;
475 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
476 return TXRX_CONTINUE;
480 hdrlen = ieee80211_get_hdrlen(tx->fc);
481 payload_len = first->len - hdrlen;
482 per_fragm = frag_threshold - hdrlen - FCS_LEN;
483 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
485 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
489 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
490 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
491 pos = first->data + hdrlen + per_fragm;
492 left = payload_len - per_fragm;
493 for (i = 0; i < num_fragm - 1; i++) {
494 struct ieee80211_hdr *fhdr;
500 /* reserve enough extra head and tail room for possible
503 dev_alloc_skb(tx->local->tx_headroom +
505 IEEE80211_ENCRYPT_HEADROOM +
506 IEEE80211_ENCRYPT_TAILROOM);
509 /* Make sure that all fragments use the same priority so
510 * that they end up using the same TX queue */
511 frag->priority = first->priority;
512 skb_reserve(frag, tx->local->tx_headroom +
513 IEEE80211_ENCRYPT_HEADROOM);
514 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
515 memcpy(fhdr, first->data, hdrlen);
516 if (i == num_fragm - 2)
517 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
518 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
519 copylen = left > per_fragm ? per_fragm : left;
520 memcpy(skb_put(frag, copylen), pos, copylen);
525 skb_trim(first, hdrlen + per_fragm);
527 tx->u.tx.num_extra_frag = num_fragm - 1;
528 tx->u.tx.extra_frag = frags;
530 return TXRX_CONTINUE;
533 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
535 for (i = 0; i < num_fragm - 1; i++)
537 dev_kfree_skb(frags[i]);
540 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
544 static ieee80211_txrx_result
545 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
548 return TXRX_CONTINUE;
550 switch (tx->key->conf.alg) {
552 return ieee80211_crypto_wep_encrypt(tx);
554 return ieee80211_crypto_tkip_encrypt(tx);
556 return ieee80211_crypto_ccmp_encrypt(tx);
564 static ieee80211_txrx_result
565 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
567 struct rate_control_extra extra;
569 memset(&extra, 0, sizeof(extra));
570 extra.mode = tx->u.tx.mode;
571 extra.ethertype = tx->ethertype;
573 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
575 if (unlikely(extra.probe != NULL)) {
576 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
577 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
578 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
579 tx->u.tx.rate = extra.probe;
581 tx->u.tx.control->alt_retry_rate = -1;
585 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
586 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
587 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
588 tx->u.tx.last_frag_rate = tx->u.tx.rate;
590 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
592 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
593 tx->u.tx.rate = extra.nonerp;
594 tx->u.tx.control->rate = extra.nonerp;
595 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
597 tx->u.tx.last_frag_rate = tx->u.tx.rate;
598 tx->u.tx.control->rate = tx->u.tx.rate;
600 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
602 return TXRX_CONTINUE;
605 static ieee80211_txrx_result
606 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
608 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
609 u16 fc = le16_to_cpu(hdr->frame_control);
611 struct ieee80211_tx_control *control = tx->u.tx.control;
612 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
614 if (!is_multicast_ether_addr(hdr->addr1)) {
615 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
616 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
617 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
618 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
619 control->retry_limit =
620 tx->local->long_retry_limit;
622 control->retry_limit =
623 tx->local->short_retry_limit;
626 control->retry_limit = 1;
629 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
630 /* Do not use multiple retry rates when sending fragmented
632 * TODO: The last fragment could still use multiple retry
634 control->alt_retry_rate = -1;
637 /* Use CTS protection for unicast frames sent using extended rates if
638 * there are associated non-ERP stations and RTS/CTS is not configured
640 if (mode->mode == MODE_IEEE80211G &&
641 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
642 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
643 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
644 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
645 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
647 /* Transmit data frames using short preambles if the driver supports
648 * short preambles at the selected rate and short preambles are
649 * available on the network at the current point in time. */
650 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
651 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
652 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
653 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
654 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
657 /* Setup duration field for the first fragment of the frame. Duration
658 * for remaining fragments will be updated when they are being sent
659 * to low-level driver in ieee80211_tx(). */
660 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
661 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
662 tx->u.tx.extra_frag[0]->len : 0);
663 hdr->duration_id = cpu_to_le16(dur);
665 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
666 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
667 struct ieee80211_rate *rate;
669 /* Do not use multiple retry rates when using RTS/CTS */
670 control->alt_retry_rate = -1;
672 /* Use min(data rate, max base rate) as CTS/RTS rate */
673 rate = tx->u.tx.rate;
674 while (rate > mode->rates &&
675 !(rate->flags & IEEE80211_RATE_BASIC))
678 control->rts_cts_rate = rate->val;
679 control->rts_rate = rate;
683 tx->sta->tx_packets++;
684 tx->sta->tx_fragments++;
685 tx->sta->tx_bytes += tx->skb->len;
686 if (tx->u.tx.extra_frag) {
688 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
689 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
691 tx->u.tx.extra_frag[i]->len;
697 * Tell hardware to not encrypt when we had sw crypto.
698 * Because we use the same flag to internally indicate that
699 * no (software) encryption should be done, we have to set it
700 * after all crypto handlers.
702 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
703 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
705 return TXRX_CONTINUE;
708 static ieee80211_txrx_result
709 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
711 struct ieee80211_local *local = tx->local;
712 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
713 struct sk_buff *skb = tx->skb;
714 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
715 u32 load = 0, hdrtime;
717 /* TODO: this could be part of tx_status handling, so that the number
718 * of retries would be known; TX rate should in that case be stored
719 * somewhere with the packet */
721 /* Estimate total channel use caused by this frame */
723 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
724 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
726 if (mode->mode == MODE_IEEE80211A ||
727 (mode->mode == MODE_IEEE80211G &&
728 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
729 hdrtime = CHAN_UTIL_HDR_SHORT;
731 hdrtime = CHAN_UTIL_HDR_LONG;
734 if (!is_multicast_ether_addr(hdr->addr1))
737 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
739 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
742 load += skb->len * tx->u.tx.rate->rate_inv;
744 if (tx->u.tx.extra_frag) {
746 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
748 load += tx->u.tx.extra_frag[i]->len *
753 /* Divide channel_use by 8 to avoid wrapping around the counter */
754 load >>= CHAN_UTIL_SHIFT;
755 local->channel_use_raw += load;
757 tx->sta->channel_use_raw += load;
758 tx->sdata->channel_use_raw += load;
760 return TXRX_CONTINUE;
763 /* TODO: implement register/unregister functions for adding TX/RX handlers
764 * into ordered list */
766 ieee80211_tx_handler ieee80211_tx_handlers[] =
768 ieee80211_tx_h_check_assoc,
769 ieee80211_tx_h_sequence,
770 ieee80211_tx_h_ps_buf,
771 ieee80211_tx_h_select_key,
772 ieee80211_tx_h_michael_mic_add,
773 ieee80211_tx_h_fragment,
774 ieee80211_tx_h_encrypt,
775 ieee80211_tx_h_rate_ctrl,
777 ieee80211_tx_h_load_stats,
781 /* actual transmit path */
784 * deal with packet injection down monitor interface
785 * with Radiotap Header -- only called for monitor mode interface
787 static ieee80211_txrx_result
788 __ieee80211_parse_tx_radiotap(
789 struct ieee80211_txrx_data *tx,
790 struct sk_buff *skb, struct ieee80211_tx_control *control)
793 * this is the moment to interpret and discard the radiotap header that
794 * must be at the start of the packet injected in Monitor mode
796 * Need to take some care with endian-ness since radiotap
797 * args are little-endian
800 struct ieee80211_radiotap_iterator iterator;
801 struct ieee80211_radiotap_header *rthdr =
802 (struct ieee80211_radiotap_header *) skb->data;
803 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
804 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
807 * default control situation for all injected packets
808 * FIXME: this does not suit all usage cases, expand to allow control
811 control->retry_limit = 1; /* no retry */
812 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
813 IEEE80211_TXCTL_USE_CTS_PROTECT);
814 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
815 IEEE80211_TXCTL_NO_ACK;
816 control->antenna_sel_tx = 0; /* default to default antenna */
819 * for every radiotap entry that is present
820 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
821 * entries present, or -EINVAL on error)
827 ret = ieee80211_radiotap_iterator_next(&iterator);
832 /* see if this argument is something we can use */
833 switch (iterator.this_arg_index) {
835 * You must take care when dereferencing iterator.this_arg
836 * for multibyte types... the pointer is not aligned. Use
837 * get_unaligned((type *)iterator.this_arg) to dereference
838 * iterator.this_arg for type "type" safely on all arches.
840 case IEEE80211_RADIOTAP_RATE:
842 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
843 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
845 target_rate = (*iterator.this_arg) * 5;
846 for (i = 0; i < mode->num_rates; i++) {
847 struct ieee80211_rate *r = &mode->rates[i];
849 if (r->rate > target_rate)
854 if (r->flags & IEEE80211_RATE_PREAMBLE2)
855 control->tx_rate = r->val2;
857 control->tx_rate = r->val;
859 /* end on exact match */
860 if (r->rate == target_rate)
865 case IEEE80211_RADIOTAP_ANTENNA:
867 * radiotap uses 0 for 1st ant, mac80211 is 1 for
870 control->antenna_sel_tx = (*iterator.this_arg) + 1;
873 case IEEE80211_RADIOTAP_DBM_TX_POWER:
874 control->power_level = *iterator.this_arg;
877 case IEEE80211_RADIOTAP_FLAGS:
878 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
880 * this indicates that the skb we have been
881 * handed has the 32-bit FCS CRC at the end...
882 * we should react to that by snipping it off
883 * because it will be recomputed and added
886 if (skb->len < (iterator.max_length + FCS_LEN))
889 skb_trim(skb, skb->len - FCS_LEN);
898 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
902 * remove the radiotap header
903 * iterator->max_length was sanity-checked against
904 * skb->len by iterator init
906 skb_pull(skb, iterator.max_length);
908 return TXRX_CONTINUE;
911 static ieee80211_txrx_result inline
912 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
914 struct net_device *dev,
915 struct ieee80211_tx_control *control)
917 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
918 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
919 struct ieee80211_sub_if_data *sdata;
920 ieee80211_txrx_result res = TXRX_CONTINUE;
924 memset(tx, 0, sizeof(*tx));
926 tx->dev = dev; /* use original interface */
928 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
931 * set defaults for things that can be set by
932 * injected radiotap headers
934 control->power_level = local->hw.conf.power_level;
935 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
937 /* process and remove the injection radiotap header */
938 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
939 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
940 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
945 * we removed the radiotap header after this point,
946 * we filled control with what we could use
947 * set to the actual ieee header now
949 hdr = (struct ieee80211_hdr *) skb->data;
950 res = TXRX_QUEUED; /* indication it was monitor packet */
953 tx->sta = sta_info_get(local, hdr->addr1);
954 tx->fc = le16_to_cpu(hdr->frame_control);
955 tx->u.tx.control = control;
956 if (is_multicast_ether_addr(hdr->addr1)) {
957 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
958 control->flags |= IEEE80211_TXCTL_NO_ACK;
960 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
961 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
963 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
964 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
965 skb->len + FCS_LEN > local->fragmentation_threshold &&
966 !local->ops->set_frag_threshold)
967 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
969 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
971 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
972 else if (tx->sta->clear_dst_mask) {
973 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
974 tx->sta->clear_dst_mask = 0;
976 hdrlen = ieee80211_get_hdrlen(tx->fc);
977 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
978 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
979 tx->ethertype = (pos[0] << 8) | pos[1];
981 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
986 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
987 * finished with it. */
988 static int inline 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 __ieee80211_tx_prepare(tx, skb, dev, control);
1008 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1009 struct ieee80211_txrx_data *tx)
1011 struct ieee80211_tx_control *control = tx->u.tx.control;
1014 if (!ieee80211_qdisc_installed(local->mdev) &&
1015 __ieee80211_queue_stopped(local, 0)) {
1016 netif_stop_queue(local->mdev);
1017 return IEEE80211_TX_AGAIN;
1020 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1021 "TX to low-level driver", skb);
1022 ret = local->ops->tx(local_to_hw(local), skb, control);
1024 return IEEE80211_TX_AGAIN;
1025 local->mdev->trans_start = jiffies;
1026 ieee80211_led_tx(local, 1);
1028 if (tx->u.tx.extra_frag) {
1029 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1030 IEEE80211_TXCTL_USE_CTS_PROTECT |
1031 IEEE80211_TXCTL_CLEAR_DST_MASK |
1032 IEEE80211_TXCTL_FIRST_FRAGMENT);
1033 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1034 if (!tx->u.tx.extra_frag[i])
1036 if (__ieee80211_queue_stopped(local, control->queue))
1037 return IEEE80211_TX_FRAG_AGAIN;
1038 if (i == tx->u.tx.num_extra_frag) {
1039 control->tx_rate = tx->u.tx.last_frag_hwrate;
1040 control->rate = tx->u.tx.last_frag_rate;
1041 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1043 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1046 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1049 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1050 "TX to low-level driver",
1051 tx->u.tx.extra_frag[i]);
1052 ret = local->ops->tx(local_to_hw(local),
1053 tx->u.tx.extra_frag[i],
1056 return IEEE80211_TX_FRAG_AGAIN;
1057 local->mdev->trans_start = jiffies;
1058 ieee80211_led_tx(local, 1);
1059 tx->u.tx.extra_frag[i] = NULL;
1061 kfree(tx->u.tx.extra_frag);
1062 tx->u.tx.extra_frag = NULL;
1064 return IEEE80211_TX_OK;
1067 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1068 struct ieee80211_tx_control *control)
1070 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1071 struct sta_info *sta;
1072 ieee80211_tx_handler *handler;
1073 struct ieee80211_txrx_data tx;
1074 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1077 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1079 if (unlikely(skb->len < 10)) {
1084 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1086 if (res_prepare == TXRX_DROP) {
1092 * key references are protected using RCU and this requires that
1093 * we are in a read-site RCU section during receive processing
1098 tx.u.tx.mode = local->hw.conf.mode;
1100 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1101 res = TXRX_CONTINUE;
1103 for (handler = local->tx_handlers; *handler != NULL;
1105 res = (*handler)(&tx);
1106 if (res != TXRX_CONTINUE)
1111 skb = tx.skb; /* handlers are allowed to change skb */
1116 if (unlikely(res == TXRX_DROP)) {
1117 I802_DEBUG_INC(local->tx_handlers_drop);
1121 if (unlikely(res == TXRX_QUEUED)) {
1122 I802_DEBUG_INC(local->tx_handlers_queued);
1127 if (tx.u.tx.extra_frag) {
1128 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1130 struct ieee80211_hdr *hdr =
1131 (struct ieee80211_hdr *)
1132 tx.u.tx.extra_frag[i]->data;
1134 if (i + 1 < tx.u.tx.num_extra_frag) {
1135 next_len = tx.u.tx.extra_frag[i + 1]->len;
1138 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1139 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1141 dur = ieee80211_duration(&tx, 0, next_len);
1142 hdr->duration_id = cpu_to_le16(dur);
1147 ret = __ieee80211_tx(local, skb, &tx);
1149 struct ieee80211_tx_stored_packet *store =
1150 &local->pending_packet[control->queue];
1152 if (ret == IEEE80211_TX_FRAG_AGAIN)
1154 set_bit(IEEE80211_LINK_STATE_PENDING,
1155 &local->state[control->queue]);
1157 /* When the driver gets out of buffers during sending of
1158 * fragments and calls ieee80211_stop_queue, there is
1159 * a small window between IEEE80211_LINK_STATE_XOFF and
1160 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1161 * gets available in that window (i.e. driver calls
1162 * ieee80211_wake_queue), we would end up with ieee80211_tx
1163 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1164 * continuing transmitting here when that situation is
1165 * possible to have happened. */
1166 if (!__ieee80211_queue_stopped(local, control->queue)) {
1167 clear_bit(IEEE80211_LINK_STATE_PENDING,
1168 &local->state[control->queue]);
1171 memcpy(&store->control, control,
1172 sizeof(struct ieee80211_tx_control));
1174 store->extra_frag = tx.u.tx.extra_frag;
1175 store->num_extra_frag = tx.u.tx.num_extra_frag;
1176 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1177 store->last_frag_rate = tx.u.tx.last_frag_rate;
1178 store->last_frag_rate_ctrl_probe =
1179 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1187 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1188 if (tx.u.tx.extra_frag[i])
1189 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1190 kfree(tx.u.tx.extra_frag);
1195 /* device xmit handlers */
1197 int ieee80211_master_start_xmit(struct sk_buff *skb,
1198 struct net_device *dev)
1200 struct ieee80211_tx_control control;
1201 struct ieee80211_tx_packet_data *pkt_data;
1202 struct net_device *odev = NULL;
1203 struct ieee80211_sub_if_data *osdata;
1208 * copy control out of the skb so other people can use skb->cb
1210 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1211 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1213 if (pkt_data->ifindex)
1214 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1215 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1219 if (unlikely(!odev)) {
1220 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1221 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1222 "originating device\n", dev->name);
1227 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1229 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1230 if (skb_headroom(skb) < headroom) {
1231 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1238 control.ifindex = odev->ifindex;
1239 control.type = osdata->type;
1240 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1241 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1242 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1243 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1244 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1245 control.flags |= IEEE80211_TXCTL_REQUEUE;
1246 control.queue = pkt_data->queue;
1248 ret = ieee80211_tx(odev, skb, &control);
1254 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1255 struct net_device *dev)
1257 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1258 struct ieee80211_tx_packet_data *pkt_data;
1259 struct ieee80211_radiotap_header *prthdr =
1260 (struct ieee80211_radiotap_header *)skb->data;
1263 /* check for not even having the fixed radiotap header part */
1264 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1265 goto fail; /* too short to be possibly valid */
1267 /* is it a header version we can trust to find length from? */
1268 if (unlikely(prthdr->it_version))
1269 goto fail; /* only version 0 is supported */
1271 /* then there must be a radiotap header with a length we can use */
1272 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1274 /* does the skb contain enough to deliver on the alleged length? */
1275 if (unlikely(skb->len < len_rthdr))
1276 goto fail; /* skb too short for claimed rt header extent */
1278 skb->dev = local->mdev;
1280 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1281 memset(pkt_data, 0, sizeof(*pkt_data));
1282 /* needed because we set skb device to master */
1283 pkt_data->ifindex = dev->ifindex;
1285 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1288 * fix up the pointers accounting for the radiotap
1289 * header still being in there. We are being given
1290 * a precooked IEEE80211 header so no need for
1293 skb_set_mac_header(skb, len_rthdr);
1295 * these are just fixed to the end of the rt area since we
1296 * don't have any better information and at this point, nobody cares
1298 skb_set_network_header(skb, len_rthdr);
1299 skb_set_transport_header(skb, len_rthdr);
1301 /* pass the radiotap header up to the next stage intact */
1302 dev_queue_xmit(skb);
1303 return NETDEV_TX_OK;
1307 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1311 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1312 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1313 * @skb: packet to be sent
1314 * @dev: incoming interface
1316 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1317 * not be freed, and caller is responsible for either retrying later or freeing
1320 * This function takes in an Ethernet header and encapsulates it with suitable
1321 * IEEE 802.11 header based on which interface the packet is coming in. The
1322 * encapsulated packet will then be passed to master interface, wlan#.11, for
1323 * transmission (through low-level driver).
1325 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1326 struct net_device *dev)
1328 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1329 struct ieee80211_tx_packet_data *pkt_data;
1330 struct ieee80211_sub_if_data *sdata;
1331 int ret = 1, head_need;
1332 u16 ethertype, hdrlen, fc;
1333 struct ieee80211_hdr hdr;
1334 const u8 *encaps_data;
1335 int encaps_len, skip_header_bytes;
1337 struct sta_info *sta;
1339 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1340 if (unlikely(skb->len < ETH_HLEN)) {
1341 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1342 dev->name, skb->len);
1347 nh_pos = skb_network_header(skb) - skb->data;
1348 h_pos = skb_transport_header(skb) - skb->data;
1350 /* convert Ethernet header to proper 802.11 header (based on
1351 * operation mode) */
1352 ethertype = (skb->data[12] << 8) | skb->data[13];
1353 /* TODO: handling for 802.1x authorized/unauthorized port */
1354 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1356 switch (sdata->type) {
1357 case IEEE80211_IF_TYPE_AP:
1358 case IEEE80211_IF_TYPE_VLAN:
1359 fc |= IEEE80211_FCTL_FROMDS;
1361 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1362 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1363 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1366 case IEEE80211_IF_TYPE_WDS:
1367 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1369 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1370 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1371 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1372 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1375 case IEEE80211_IF_TYPE_STA:
1376 fc |= IEEE80211_FCTL_TODS;
1378 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1379 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1380 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1383 case IEEE80211_IF_TYPE_IBSS:
1385 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1386 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1387 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1395 /* receiver is QoS enabled, use a QoS type frame */
1396 sta = sta_info_get(local, hdr.addr1);
1398 if (sta->flags & WLAN_STA_WME) {
1399 fc |= IEEE80211_STYPE_QOS_DATA;
1405 hdr.frame_control = cpu_to_le16(fc);
1406 hdr.duration_id = 0;
1409 skip_header_bytes = ETH_HLEN;
1410 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1411 encaps_data = bridge_tunnel_header;
1412 encaps_len = sizeof(bridge_tunnel_header);
1413 skip_header_bytes -= 2;
1414 } else if (ethertype >= 0x600) {
1415 encaps_data = rfc1042_header;
1416 encaps_len = sizeof(rfc1042_header);
1417 skip_header_bytes -= 2;
1423 skb_pull(skb, skip_header_bytes);
1424 nh_pos -= skip_header_bytes;
1425 h_pos -= skip_header_bytes;
1427 /* TODO: implement support for fragments so that there is no need to
1428 * reallocate and copy payload; it might be enough to support one
1429 * extra fragment that would be copied in the beginning of the frame
1430 * data.. anyway, it would be nice to include this into skb structure
1433 * There are few options for this:
1434 * use skb->cb as an extra space for 802.11 header
1435 * allocate new buffer if not enough headroom
1436 * make sure that there is enough headroom in every skb by increasing
1437 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1438 * alloc_skb() (net/core/skbuff.c)
1440 head_need = hdrlen + encaps_len + local->tx_headroom;
1441 head_need -= skb_headroom(skb);
1443 /* We are going to modify skb data, so make a copy of it if happens to
1444 * be cloned. This could happen, e.g., with Linux bridge code passing
1445 * us broadcast frames. */
1447 if (head_need > 0 || skb_cloned(skb)) {
1449 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1450 "of headroom\n", dev->name, head_need);
1453 if (skb_cloned(skb))
1454 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1456 I802_DEBUG_INC(local->tx_expand_skb_head);
1457 /* Since we have to reallocate the buffer, make sure that there
1458 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1459 * before payload and 12 after). */
1460 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1462 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1469 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1470 nh_pos += encaps_len;
1471 h_pos += encaps_len;
1474 if (fc & IEEE80211_STYPE_QOS_DATA) {
1475 __le16 *qos_control;
1477 qos_control = (__le16*) skb_push(skb, 2);
1478 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1480 * Maybe we could actually set some fields here, for now just
1481 * initialise to zero to indicate no special operation.
1485 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1490 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1491 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1492 pkt_data->ifindex = dev->ifindex;
1494 skb->dev = local->mdev;
1495 dev->stats.tx_packets++;
1496 dev->stats.tx_bytes += skb->len;
1498 /* Update skb pointers to various headers since this modified frame
1499 * is going to go through Linux networking code that may potentially
1500 * need things like pointer to IP header. */
1501 skb_set_mac_header(skb, 0);
1502 skb_set_network_header(skb, nh_pos);
1503 skb_set_transport_header(skb, h_pos);
1505 dev->trans_start = jiffies;
1506 dev_queue_xmit(skb);
1518 * This is the transmit routine for the 802.11 type interfaces
1519 * called by upper layers of the linux networking
1520 * stack when it has a frame to transmit
1522 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1524 struct ieee80211_sub_if_data *sdata;
1525 struct ieee80211_tx_packet_data *pkt_data;
1526 struct ieee80211_hdr *hdr;
1529 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1531 if (skb->len < 10) {
1536 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1537 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1544 hdr = (struct ieee80211_hdr *) skb->data;
1545 fc = le16_to_cpu(hdr->frame_control);
1547 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1548 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1549 pkt_data->ifindex = sdata->dev->ifindex;
1551 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1552 skb->dev = sdata->local->mdev;
1555 * We're using the protocol field of the the frame control header
1556 * to request TX callback for hostapd. BIT(1) is checked.
1558 if ((fc & BIT(1)) == BIT(1)) {
1559 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1561 hdr->frame_control = cpu_to_le16(fc);
1564 if (!(fc & IEEE80211_FCTL_PROTECTED))
1565 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1567 dev->stats.tx_packets++;
1568 dev->stats.tx_bytes += skb->len;
1570 dev_queue_xmit(skb);
1575 /* helper functions for pending packets for when queues are stopped */
1577 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1580 struct ieee80211_tx_stored_packet *store;
1582 for (i = 0; i < local->hw.queues; i++) {
1583 if (!__ieee80211_queue_pending(local, i))
1585 store = &local->pending_packet[i];
1586 kfree_skb(store->skb);
1587 for (j = 0; j < store->num_extra_frag; j++)
1588 kfree_skb(store->extra_frag[j]);
1589 kfree(store->extra_frag);
1590 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1594 void ieee80211_tx_pending(unsigned long data)
1596 struct ieee80211_local *local = (struct ieee80211_local *)data;
1597 struct net_device *dev = local->mdev;
1598 struct ieee80211_tx_stored_packet *store;
1599 struct ieee80211_txrx_data tx;
1600 int i, ret, reschedule = 0;
1602 netif_tx_lock_bh(dev);
1603 for (i = 0; i < local->hw.queues; i++) {
1604 if (__ieee80211_queue_stopped(local, i))
1606 if (!__ieee80211_queue_pending(local, i)) {
1610 store = &local->pending_packet[i];
1611 tx.u.tx.control = &store->control;
1612 tx.u.tx.extra_frag = store->extra_frag;
1613 tx.u.tx.num_extra_frag = store->num_extra_frag;
1614 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1615 tx.u.tx.last_frag_rate = store->last_frag_rate;
1617 if (store->last_frag_rate_ctrl_probe)
1618 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1619 ret = __ieee80211_tx(local, store->skb, &tx);
1621 if (ret == IEEE80211_TX_FRAG_AGAIN)
1624 clear_bit(IEEE80211_LINK_STATE_PENDING,
1629 netif_tx_unlock_bh(dev);
1631 if (!ieee80211_qdisc_installed(dev)) {
1632 if (!__ieee80211_queue_stopped(local, 0))
1633 netif_wake_queue(dev);
1635 netif_schedule(dev);
1639 /* functions for drivers to get certain frames */
1641 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1642 struct ieee80211_if_ap *bss,
1643 struct sk_buff *skb)
1647 int i, have_bits = 0, n1, n2;
1649 /* Generate bitmap for TIM only if there are any STAs in power save
1651 read_lock_bh(&local->sta_lock);
1652 if (atomic_read(&bss->num_sta_ps) > 0)
1653 /* in the hope that this is faster than
1654 * checking byte-for-byte */
1655 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1656 IEEE80211_MAX_AID+1);
1658 if (bss->dtim_count == 0)
1659 bss->dtim_count = bss->dtim_period - 1;
1663 tim = pos = (u8 *) skb_put(skb, 6);
1664 *pos++ = WLAN_EID_TIM;
1666 *pos++ = bss->dtim_count;
1667 *pos++ = bss->dtim_period;
1669 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1673 /* Find largest even number N1 so that bits numbered 1 through
1674 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1675 * (N2 + 1) x 8 through 2007 are 0. */
1677 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1684 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1691 /* Bitmap control */
1693 /* Part Virt Bitmap */
1694 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1696 tim[1] = n2 - n1 + 4;
1697 skb_put(skb, n2 - n1);
1699 *pos++ = aid0; /* Bitmap control */
1700 *pos++ = 0; /* Part Virt Bitmap */
1702 read_unlock_bh(&local->sta_lock);
1705 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1706 struct ieee80211_tx_control *control)
1708 struct ieee80211_local *local = hw_to_local(hw);
1709 struct sk_buff *skb;
1710 struct net_device *bdev;
1711 struct ieee80211_sub_if_data *sdata = NULL;
1712 struct ieee80211_if_ap *ap = NULL;
1713 struct ieee80211_rate *rate;
1714 struct rate_control_extra extra;
1715 u8 *b_head, *b_tail;
1718 bdev = dev_get_by_index(&init_net, if_id);
1720 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1725 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1727 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1728 if (net_ratelimit())
1729 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1730 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1731 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1735 /* Assume we are generating the normal beacon locally */
1736 b_head = ap->beacon_head;
1737 b_tail = ap->beacon_tail;
1738 bh_len = ap->beacon_head_len;
1739 bt_len = ap->beacon_tail_len;
1741 skb = dev_alloc_skb(local->tx_headroom +
1742 bh_len + bt_len + 256 /* maximum TIM len */);
1746 skb_reserve(skb, local->tx_headroom);
1747 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1749 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1751 ieee80211_beacon_add_tim(local, ap, skb);
1754 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1758 memset(&extra, 0, sizeof(extra));
1759 extra.mode = local->oper_hw_mode;
1761 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1763 if (net_ratelimit()) {
1764 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1765 "found\n", wiphy_name(local->hw.wiphy));
1772 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1773 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1774 rate->val2 : rate->val;
1775 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1776 control->power_level = local->hw.conf.power_level;
1777 control->flags |= IEEE80211_TXCTL_NO_ACK;
1778 control->retry_limit = 1;
1779 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1785 EXPORT_SYMBOL(ieee80211_beacon_get);
1787 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1788 const void *frame, size_t frame_len,
1789 const struct ieee80211_tx_control *frame_txctl,
1790 struct ieee80211_rts *rts)
1792 const struct ieee80211_hdr *hdr = frame;
1795 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1796 rts->frame_control = cpu_to_le16(fctl);
1797 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1798 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1799 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1801 EXPORT_SYMBOL(ieee80211_rts_get);
1803 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1804 const void *frame, size_t frame_len,
1805 const struct ieee80211_tx_control *frame_txctl,
1806 struct ieee80211_cts *cts)
1808 const struct ieee80211_hdr *hdr = frame;
1811 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1812 cts->frame_control = cpu_to_le16(fctl);
1813 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1814 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1816 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1819 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1820 struct ieee80211_tx_control *control)
1822 struct ieee80211_local *local = hw_to_local(hw);
1823 struct sk_buff *skb;
1824 struct sta_info *sta;
1825 ieee80211_tx_handler *handler;
1826 struct ieee80211_txrx_data tx;
1827 ieee80211_txrx_result res = TXRX_DROP;
1828 struct net_device *bdev;
1829 struct ieee80211_sub_if_data *sdata;
1830 struct ieee80211_if_ap *bss = NULL;
1832 bdev = dev_get_by_index(&init_net, if_id);
1834 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1838 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1841 if (bss->dtim_count != 0)
1842 return NULL; /* send buffered bc/mc only after DTIM beacon */
1843 memset(control, 0, sizeof(*control));
1845 skb = skb_dequeue(&bss->ps_bc_buf);
1848 local->total_ps_buffered--;
1850 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1851 struct ieee80211_hdr *hdr =
1852 (struct ieee80211_hdr *) skb->data;
1853 /* more buffered multicast/broadcast frames ==> set
1854 * MoreData flag in IEEE 802.11 header to inform PS
1856 hdr->frame_control |=
1857 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1860 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1862 dev_kfree_skb_any(skb);
1865 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1866 tx.u.tx.mode = local->hw.conf.mode;
1868 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1869 res = (*handler)(&tx);
1870 if (res == TXRX_DROP || res == TXRX_QUEUED)
1874 skb = tx.skb; /* handlers are allowed to change skb */
1876 if (res == TXRX_DROP) {
1877 I802_DEBUG_INC(local->tx_handlers_drop);
1880 } else if (res == TXRX_QUEUED) {
1881 I802_DEBUG_INC(local->tx_handlers_queued);
1890 EXPORT_SYMBOL(ieee80211_get_buffered_bc);