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(!tx->u.tx.mgmt_interface && 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;
298 read_lock(&local->sub_if_lock);
299 list_for_each_entry(sdata, &local->sub_if_list, list) {
300 struct ieee80211_if_ap *ap;
301 if (sdata->dev == local->mdev ||
302 sdata->type != IEEE80211_IF_TYPE_AP)
305 skb = skb_dequeue(&ap->ps_bc_buf);
310 total += skb_queue_len(&ap->ps_bc_buf);
312 read_unlock(&local->sub_if_lock);
314 read_lock_bh(&local->sta_lock);
315 list_for_each_entry(sta, &local->sta_list, list) {
316 skb = skb_dequeue(&sta->ps_tx_buf);
321 total += skb_queue_len(&sta->ps_tx_buf);
323 read_unlock_bh(&local->sta_lock);
325 local->total_ps_buffered = total;
326 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
327 local->mdev->name, purged);
330 static inline ieee80211_txrx_result
331 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
333 /* broadcast/multicast frame */
334 /* If any of the associated stations is in power save mode,
335 * the frame is buffered to be sent after DTIM beacon frame */
336 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
337 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
338 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
339 !(tx->fc & IEEE80211_FCTL_ORDER)) {
340 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
341 purge_old_ps_buffers(tx->local);
342 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
344 if (net_ratelimit()) {
345 printk(KERN_DEBUG "%s: BC TX buffer full - "
346 "dropping the oldest frame\n",
349 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
351 tx->local->total_ps_buffered++;
352 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
356 return TXRX_CONTINUE;
359 static inline ieee80211_txrx_result
360 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
362 struct sta_info *sta = tx->sta;
363 DECLARE_MAC_BUF(mac);
366 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
367 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
368 return TXRX_CONTINUE;
370 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
371 struct ieee80211_tx_packet_data *pkt_data;
372 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
373 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
375 print_mac(mac, sta->addr), sta->aid,
376 skb_queue_len(&sta->ps_tx_buf));
377 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
378 sta->flags |= WLAN_STA_TIM;
379 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
380 purge_old_ps_buffers(tx->local);
381 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
382 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
383 if (net_ratelimit()) {
384 printk(KERN_DEBUG "%s: STA %s TX "
385 "buffer full - dropping oldest frame\n",
386 tx->dev->name, print_mac(mac, sta->addr));
390 tx->local->total_ps_buffered++;
391 /* Queue frame to be sent after STA sends an PS Poll frame */
392 if (skb_queue_empty(&sta->ps_tx_buf)) {
393 if (tx->local->ops->set_tim)
394 tx->local->ops->set_tim(local_to_hw(tx->local),
397 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
399 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
400 pkt_data->jiffies = jiffies;
401 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
404 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
405 else if (unlikely(sta->flags & WLAN_STA_PS)) {
406 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
407 "set -> send frame\n", tx->dev->name,
408 print_mac(mac, sta->addr));
410 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
413 return TXRX_CONTINUE;
417 static ieee80211_txrx_result
418 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
420 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
421 return TXRX_CONTINUE;
423 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
424 return ieee80211_tx_h_unicast_ps_buf(tx);
426 return ieee80211_tx_h_multicast_ps_buf(tx);
432 static ieee80211_txrx_result
433 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
435 struct ieee80211_key *key;
437 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
439 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
441 else if ((key = rcu_dereference(tx->sdata->default_key)))
443 else if (tx->sdata->drop_unencrypted &&
444 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
445 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
449 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
453 tx->key->tx_rx_count++;
454 if (unlikely(tx->local->key_tx_rx_threshold &&
455 tx->key->tx_rx_count >
456 tx->local->key_tx_rx_threshold)) {
457 ieee80211_key_threshold_notify(tx->dev, tx->key,
462 return TXRX_CONTINUE;
465 static ieee80211_txrx_result
466 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
468 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
469 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
470 struct sk_buff **frags, *first, *frag;
474 int frag_threshold = tx->local->fragmentation_threshold;
476 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
477 return TXRX_CONTINUE;
481 hdrlen = ieee80211_get_hdrlen(tx->fc);
482 payload_len = first->len - hdrlen;
483 per_fragm = frag_threshold - hdrlen - FCS_LEN;
484 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
486 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
490 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
491 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
492 pos = first->data + hdrlen + per_fragm;
493 left = payload_len - per_fragm;
494 for (i = 0; i < num_fragm - 1; i++) {
495 struct ieee80211_hdr *fhdr;
501 /* reserve enough extra head and tail room for possible
504 dev_alloc_skb(tx->local->tx_headroom +
506 IEEE80211_ENCRYPT_HEADROOM +
507 IEEE80211_ENCRYPT_TAILROOM);
510 /* Make sure that all fragments use the same priority so
511 * that they end up using the same TX queue */
512 frag->priority = first->priority;
513 skb_reserve(frag, tx->local->tx_headroom +
514 IEEE80211_ENCRYPT_HEADROOM);
515 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
516 memcpy(fhdr, first->data, hdrlen);
517 if (i == num_fragm - 2)
518 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
519 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
520 copylen = left > per_fragm ? per_fragm : left;
521 memcpy(skb_put(frag, copylen), pos, copylen);
526 skb_trim(first, hdrlen + per_fragm);
528 tx->u.tx.num_extra_frag = num_fragm - 1;
529 tx->u.tx.extra_frag = frags;
531 return TXRX_CONTINUE;
534 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
536 for (i = 0; i < num_fragm - 1; i++)
538 dev_kfree_skb(frags[i]);
541 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
545 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
547 if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
548 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
551 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
552 if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
553 if (!ieee80211_wep_add_iv(tx->local, skb, tx->key))
560 static ieee80211_txrx_result
561 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
563 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
566 fc = le16_to_cpu(hdr->frame_control);
568 if (!tx->key || tx->key->conf.alg != ALG_WEP ||
569 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
570 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
571 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
572 return TXRX_CONTINUE;
574 tx->u.tx.control->iv_len = WEP_IV_LEN;
575 tx->u.tx.control->icv_len = WEP_ICV_LEN;
576 ieee80211_tx_set_iswep(tx);
578 if (wep_encrypt_skb(tx, tx->skb) < 0) {
579 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
583 if (tx->u.tx.extra_frag) {
585 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
586 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
587 I802_DEBUG_INC(tx->local->
588 tx_handlers_drop_wep);
594 return TXRX_CONTINUE;
597 static ieee80211_txrx_result
598 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
600 struct rate_control_extra extra;
602 memset(&extra, 0, sizeof(extra));
603 extra.mode = tx->u.tx.mode;
604 extra.mgmt_data = tx->sdata &&
605 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
606 extra.ethertype = tx->ethertype;
608 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
610 if (unlikely(extra.probe != NULL)) {
611 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
612 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
613 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
614 tx->u.tx.rate = extra.probe;
616 tx->u.tx.control->alt_retry_rate = -1;
620 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
621 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
622 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
623 tx->u.tx.last_frag_rate = tx->u.tx.rate;
625 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
627 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
628 tx->u.tx.rate = extra.nonerp;
629 tx->u.tx.control->rate = extra.nonerp;
630 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
632 tx->u.tx.last_frag_rate = tx->u.tx.rate;
633 tx->u.tx.control->rate = tx->u.tx.rate;
635 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
637 return TXRX_CONTINUE;
640 static ieee80211_txrx_result
641 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
643 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
644 u16 fc = le16_to_cpu(hdr->frame_control);
646 struct ieee80211_tx_control *control = tx->u.tx.control;
647 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
649 if (!is_multicast_ether_addr(hdr->addr1)) {
650 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
651 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
652 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
653 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
654 control->retry_limit =
655 tx->local->long_retry_limit;
657 control->retry_limit =
658 tx->local->short_retry_limit;
661 control->retry_limit = 1;
664 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
665 /* Do not use multiple retry rates when sending fragmented
667 * TODO: The last fragment could still use multiple retry
669 control->alt_retry_rate = -1;
672 /* Use CTS protection for unicast frames sent using extended rates if
673 * there are associated non-ERP stations and RTS/CTS is not configured
675 if (mode->mode == MODE_IEEE80211G &&
676 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
677 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
678 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
679 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
680 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
682 /* Transmit data frames using short preambles if the driver supports
683 * short preambles at the selected rate and short preambles are
684 * available on the network at the current point in time. */
685 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
686 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
687 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
688 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
689 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
692 /* Setup duration field for the first fragment of the frame. Duration
693 * for remaining fragments will be updated when they are being sent
694 * to low-level driver in ieee80211_tx(). */
695 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
696 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
697 tx->u.tx.extra_frag[0]->len : 0);
698 hdr->duration_id = cpu_to_le16(dur);
700 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
701 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
702 struct ieee80211_rate *rate;
704 /* Do not use multiple retry rates when using RTS/CTS */
705 control->alt_retry_rate = -1;
707 /* Use min(data rate, max base rate) as CTS/RTS rate */
708 rate = tx->u.tx.rate;
709 while (rate > mode->rates &&
710 !(rate->flags & IEEE80211_RATE_BASIC))
713 control->rts_cts_rate = rate->val;
714 control->rts_rate = rate;
718 tx->sta->tx_packets++;
719 tx->sta->tx_fragments++;
720 tx->sta->tx_bytes += tx->skb->len;
721 if (tx->u.tx.extra_frag) {
723 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
724 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
726 tx->u.tx.extra_frag[i]->len;
732 * Tell hardware to not encrypt when we had sw crypto.
733 * Because we use the same flag to internally indicate that
734 * no (software) encryption should be done, we have to set it
735 * after all crypto handlers.
737 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
738 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
740 return TXRX_CONTINUE;
743 static ieee80211_txrx_result
744 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
746 struct ieee80211_local *local = tx->local;
747 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
748 struct sk_buff *skb = tx->skb;
749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
750 u32 load = 0, hdrtime;
752 /* TODO: this could be part of tx_status handling, so that the number
753 * of retries would be known; TX rate should in that case be stored
754 * somewhere with the packet */
756 /* Estimate total channel use caused by this frame */
758 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
759 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
761 if (mode->mode == MODE_IEEE80211A ||
762 (mode->mode == MODE_IEEE80211G &&
763 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
764 hdrtime = CHAN_UTIL_HDR_SHORT;
766 hdrtime = CHAN_UTIL_HDR_LONG;
769 if (!is_multicast_ether_addr(hdr->addr1))
772 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
774 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
777 load += skb->len * tx->u.tx.rate->rate_inv;
779 if (tx->u.tx.extra_frag) {
781 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
783 load += tx->u.tx.extra_frag[i]->len *
788 /* Divide channel_use by 8 to avoid wrapping around the counter */
789 load >>= CHAN_UTIL_SHIFT;
790 local->channel_use_raw += load;
792 tx->sta->channel_use_raw += load;
793 tx->sdata->channel_use_raw += load;
795 return TXRX_CONTINUE;
798 /* TODO: implement register/unregister functions for adding TX/RX handlers
799 * into ordered list */
801 ieee80211_tx_handler ieee80211_tx_handlers[] =
803 ieee80211_tx_h_check_assoc,
804 ieee80211_tx_h_sequence,
805 ieee80211_tx_h_ps_buf,
806 ieee80211_tx_h_select_key,
807 ieee80211_tx_h_michael_mic_add,
808 ieee80211_tx_h_fragment,
809 ieee80211_tx_h_tkip_encrypt,
810 ieee80211_tx_h_ccmp_encrypt,
811 ieee80211_tx_h_wep_encrypt,
812 ieee80211_tx_h_rate_ctrl,
814 ieee80211_tx_h_load_stats,
818 /* actual transmit path */
821 * deal with packet injection down monitor interface
822 * with Radiotap Header -- only called for monitor mode interface
824 static ieee80211_txrx_result
825 __ieee80211_parse_tx_radiotap(
826 struct ieee80211_txrx_data *tx,
827 struct sk_buff *skb, struct ieee80211_tx_control *control)
830 * this is the moment to interpret and discard the radiotap header that
831 * must be at the start of the packet injected in Monitor mode
833 * Need to take some care with endian-ness since radiotap
834 * args are little-endian
837 struct ieee80211_radiotap_iterator iterator;
838 struct ieee80211_radiotap_header *rthdr =
839 (struct ieee80211_radiotap_header *) skb->data;
840 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
841 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
844 * default control situation for all injected packets
845 * FIXME: this does not suit all usage cases, expand to allow control
848 control->retry_limit = 1; /* no retry */
849 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
850 IEEE80211_TXCTL_USE_CTS_PROTECT);
851 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
852 IEEE80211_TXCTL_NO_ACK;
853 control->antenna_sel_tx = 0; /* default to default antenna */
856 * for every radiotap entry that is present
857 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
858 * entries present, or -EINVAL on error)
864 ret = ieee80211_radiotap_iterator_next(&iterator);
869 /* see if this argument is something we can use */
870 switch (iterator.this_arg_index) {
872 * You must take care when dereferencing iterator.this_arg
873 * for multibyte types... the pointer is not aligned. Use
874 * get_unaligned((type *)iterator.this_arg) to dereference
875 * iterator.this_arg for type "type" safely on all arches.
877 case IEEE80211_RADIOTAP_RATE:
879 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
880 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
882 target_rate = (*iterator.this_arg) * 5;
883 for (i = 0; i < mode->num_rates; i++) {
884 struct ieee80211_rate *r = &mode->rates[i];
886 if (r->rate > target_rate)
891 if (r->flags & IEEE80211_RATE_PREAMBLE2)
892 control->tx_rate = r->val2;
894 control->tx_rate = r->val;
896 /* end on exact match */
897 if (r->rate == target_rate)
902 case IEEE80211_RADIOTAP_ANTENNA:
904 * radiotap uses 0 for 1st ant, mac80211 is 1 for
907 control->antenna_sel_tx = (*iterator.this_arg) + 1;
910 case IEEE80211_RADIOTAP_DBM_TX_POWER:
911 control->power_level = *iterator.this_arg;
914 case IEEE80211_RADIOTAP_FLAGS:
915 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
917 * this indicates that the skb we have been
918 * handed has the 32-bit FCS CRC at the end...
919 * we should react to that by snipping it off
920 * because it will be recomputed and added
923 if (skb->len < (iterator.max_length + FCS_LEN))
926 skb_trim(skb, skb->len - FCS_LEN);
935 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
939 * remove the radiotap header
940 * iterator->max_length was sanity-checked against
941 * skb->len by iterator init
943 skb_pull(skb, iterator.max_length);
945 return TXRX_CONTINUE;
948 static ieee80211_txrx_result inline
949 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
951 struct net_device *dev,
952 struct ieee80211_tx_control *control)
954 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
955 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
956 struct ieee80211_sub_if_data *sdata;
957 ieee80211_txrx_result res = TXRX_CONTINUE;
961 memset(tx, 0, sizeof(*tx));
963 tx->dev = dev; /* use original interface */
965 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
968 * set defaults for things that can be set by
969 * injected radiotap headers
971 control->power_level = local->hw.conf.power_level;
972 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
974 /* process and remove the injection radiotap header */
975 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
976 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
977 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
982 * we removed the radiotap header after this point,
983 * we filled control with what we could use
984 * set to the actual ieee header now
986 hdr = (struct ieee80211_hdr *) skb->data;
987 res = TXRX_QUEUED; /* indication it was monitor packet */
990 tx->sta = sta_info_get(local, hdr->addr1);
991 tx->fc = le16_to_cpu(hdr->frame_control);
992 tx->u.tx.control = control;
993 if (is_multicast_ether_addr(hdr->addr1)) {
994 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
995 control->flags |= IEEE80211_TXCTL_NO_ACK;
997 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
998 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1000 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
1001 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
1002 skb->len + FCS_LEN > local->fragmentation_threshold &&
1003 !local->ops->set_frag_threshold)
1004 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
1006 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
1008 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1009 else if (tx->sta->clear_dst_mask) {
1010 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1011 tx->sta->clear_dst_mask = 0;
1013 hdrlen = ieee80211_get_hdrlen(tx->fc);
1014 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1015 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1016 tx->ethertype = (pos[0] << 8) | pos[1];
1018 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1023 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1024 * finished with it. */
1025 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1026 struct sk_buff *skb,
1027 struct net_device *mdev,
1028 struct ieee80211_tx_control *control)
1030 struct ieee80211_tx_packet_data *pkt_data;
1031 struct net_device *dev;
1033 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1034 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1035 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1041 __ieee80211_tx_prepare(tx, skb, dev, control);
1045 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1046 struct ieee80211_txrx_data *tx)
1048 struct ieee80211_tx_control *control = tx->u.tx.control;
1051 if (!ieee80211_qdisc_installed(local->mdev) &&
1052 __ieee80211_queue_stopped(local, 0)) {
1053 netif_stop_queue(local->mdev);
1054 return IEEE80211_TX_AGAIN;
1057 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1058 ret = local->ops->tx(local_to_hw(local), skb, control);
1060 return IEEE80211_TX_AGAIN;
1061 local->mdev->trans_start = jiffies;
1062 ieee80211_led_tx(local, 1);
1064 if (tx->u.tx.extra_frag) {
1065 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1066 IEEE80211_TXCTL_USE_CTS_PROTECT |
1067 IEEE80211_TXCTL_CLEAR_DST_MASK |
1068 IEEE80211_TXCTL_FIRST_FRAGMENT);
1069 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1070 if (!tx->u.tx.extra_frag[i])
1072 if (__ieee80211_queue_stopped(local, control->queue))
1073 return IEEE80211_TX_FRAG_AGAIN;
1074 if (i == tx->u.tx.num_extra_frag) {
1075 control->tx_rate = tx->u.tx.last_frag_hwrate;
1076 control->rate = tx->u.tx.last_frag_rate;
1077 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1079 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1082 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1085 ieee80211_dump_frame(local->mdev->name,
1086 "TX to low-level driver",
1087 tx->u.tx.extra_frag[i]);
1088 ret = local->ops->tx(local_to_hw(local),
1089 tx->u.tx.extra_frag[i],
1092 return IEEE80211_TX_FRAG_AGAIN;
1093 local->mdev->trans_start = jiffies;
1094 ieee80211_led_tx(local, 1);
1095 tx->u.tx.extra_frag[i] = NULL;
1097 kfree(tx->u.tx.extra_frag);
1098 tx->u.tx.extra_frag = NULL;
1100 return IEEE80211_TX_OK;
1103 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1104 struct ieee80211_tx_control *control, int mgmt)
1106 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1107 struct sta_info *sta;
1108 ieee80211_tx_handler *handler;
1109 struct ieee80211_txrx_data tx;
1110 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1113 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1115 if (unlikely(skb->len < 10)) {
1120 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1122 if (res_prepare == TXRX_DROP) {
1128 * key references are protected using RCU and this requires that
1129 * we are in a read-site RCU section during receive processing
1134 tx.u.tx.mgmt_interface = mgmt;
1135 tx.u.tx.mode = local->hw.conf.mode;
1137 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1138 res = TXRX_CONTINUE;
1140 for (handler = local->tx_handlers; *handler != NULL;
1142 res = (*handler)(&tx);
1143 if (res != TXRX_CONTINUE)
1148 skb = tx.skb; /* handlers are allowed to change skb */
1153 if (unlikely(res == TXRX_DROP)) {
1154 I802_DEBUG_INC(local->tx_handlers_drop);
1158 if (unlikely(res == TXRX_QUEUED)) {
1159 I802_DEBUG_INC(local->tx_handlers_queued);
1164 if (tx.u.tx.extra_frag) {
1165 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1167 struct ieee80211_hdr *hdr =
1168 (struct ieee80211_hdr *)
1169 tx.u.tx.extra_frag[i]->data;
1171 if (i + 1 < tx.u.tx.num_extra_frag) {
1172 next_len = tx.u.tx.extra_frag[i + 1]->len;
1175 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1176 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1178 dur = ieee80211_duration(&tx, 0, next_len);
1179 hdr->duration_id = cpu_to_le16(dur);
1184 ret = __ieee80211_tx(local, skb, &tx);
1186 struct ieee80211_tx_stored_packet *store =
1187 &local->pending_packet[control->queue];
1189 if (ret == IEEE80211_TX_FRAG_AGAIN)
1191 set_bit(IEEE80211_LINK_STATE_PENDING,
1192 &local->state[control->queue]);
1194 /* When the driver gets out of buffers during sending of
1195 * fragments and calls ieee80211_stop_queue, there is
1196 * a small window between IEEE80211_LINK_STATE_XOFF and
1197 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1198 * gets available in that window (i.e. driver calls
1199 * ieee80211_wake_queue), we would end up with ieee80211_tx
1200 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1201 * continuing transmitting here when that situation is
1202 * possible to have happened. */
1203 if (!__ieee80211_queue_stopped(local, control->queue)) {
1204 clear_bit(IEEE80211_LINK_STATE_PENDING,
1205 &local->state[control->queue]);
1208 memcpy(&store->control, control,
1209 sizeof(struct ieee80211_tx_control));
1211 store->extra_frag = tx.u.tx.extra_frag;
1212 store->num_extra_frag = tx.u.tx.num_extra_frag;
1213 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1214 store->last_frag_rate = tx.u.tx.last_frag_rate;
1215 store->last_frag_rate_ctrl_probe =
1216 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1224 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1225 if (tx.u.tx.extra_frag[i])
1226 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1227 kfree(tx.u.tx.extra_frag);
1232 /* device xmit handlers */
1234 int ieee80211_master_start_xmit(struct sk_buff *skb,
1235 struct net_device *dev)
1237 struct ieee80211_tx_control control;
1238 struct ieee80211_tx_packet_data *pkt_data;
1239 struct net_device *odev = NULL;
1240 struct ieee80211_sub_if_data *osdata;
1245 * copy control out of the skb so other people can use skb->cb
1247 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1248 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1250 if (pkt_data->ifindex)
1251 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1252 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1256 if (unlikely(!odev)) {
1257 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1258 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1259 "originating device\n", dev->name);
1264 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1266 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1267 if (skb_headroom(skb) < headroom) {
1268 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1275 control.ifindex = odev->ifindex;
1276 control.type = osdata->type;
1277 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1278 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1279 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1280 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1281 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1282 control.flags |= IEEE80211_TXCTL_REQUEUE;
1283 control.queue = pkt_data->queue;
1285 ret = ieee80211_tx(odev, skb, &control,
1286 control.type == IEEE80211_IF_TYPE_MGMT);
1292 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1293 struct net_device *dev)
1295 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1296 struct ieee80211_tx_packet_data *pkt_data;
1297 struct ieee80211_radiotap_header *prthdr =
1298 (struct ieee80211_radiotap_header *)skb->data;
1301 /* check for not even having the fixed radiotap header part */
1302 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1303 goto fail; /* too short to be possibly valid */
1305 /* is it a header version we can trust to find length from? */
1306 if (unlikely(prthdr->it_version))
1307 goto fail; /* only version 0 is supported */
1309 /* then there must be a radiotap header with a length we can use */
1310 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1312 /* does the skb contain enough to deliver on the alleged length? */
1313 if (unlikely(skb->len < len_rthdr))
1314 goto fail; /* skb too short for claimed rt header extent */
1316 skb->dev = local->mdev;
1318 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1319 memset(pkt_data, 0, sizeof(*pkt_data));
1320 /* needed because we set skb device to master */
1321 pkt_data->ifindex = dev->ifindex;
1323 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1326 * fix up the pointers accounting for the radiotap
1327 * header still being in there. We are being given
1328 * a precooked IEEE80211 header so no need for
1331 skb_set_mac_header(skb, len_rthdr);
1333 * these are just fixed to the end of the rt area since we
1334 * don't have any better information and at this point, nobody cares
1336 skb_set_network_header(skb, len_rthdr);
1337 skb_set_transport_header(skb, len_rthdr);
1339 /* pass the radiotap header up to the next stage intact */
1340 dev_queue_xmit(skb);
1341 return NETDEV_TX_OK;
1345 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1349 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1350 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1351 * @skb: packet to be sent
1352 * @dev: incoming interface
1354 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1355 * not be freed, and caller is responsible for either retrying later or freeing
1358 * This function takes in an Ethernet header and encapsulates it with suitable
1359 * IEEE 802.11 header based on which interface the packet is coming in. The
1360 * encapsulated packet will then be passed to master interface, wlan#.11, for
1361 * transmission (through low-level driver).
1363 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1364 struct net_device *dev)
1366 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1367 struct ieee80211_tx_packet_data *pkt_data;
1368 struct ieee80211_sub_if_data *sdata;
1369 int ret = 1, head_need;
1370 u16 ethertype, hdrlen, fc;
1371 struct ieee80211_hdr hdr;
1372 const u8 *encaps_data;
1373 int encaps_len, skip_header_bytes;
1375 struct sta_info *sta;
1377 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1378 if (unlikely(skb->len < ETH_HLEN)) {
1379 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1380 dev->name, skb->len);
1385 nh_pos = skb_network_header(skb) - skb->data;
1386 h_pos = skb_transport_header(skb) - skb->data;
1388 /* convert Ethernet header to proper 802.11 header (based on
1389 * operation mode) */
1390 ethertype = (skb->data[12] << 8) | skb->data[13];
1391 /* TODO: handling for 802.1x authorized/unauthorized port */
1392 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1394 switch (sdata->type) {
1395 case IEEE80211_IF_TYPE_AP:
1396 case IEEE80211_IF_TYPE_VLAN:
1397 fc |= IEEE80211_FCTL_FROMDS;
1399 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1400 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1401 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1404 case IEEE80211_IF_TYPE_WDS:
1405 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1407 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1408 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1409 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1410 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1413 case IEEE80211_IF_TYPE_STA:
1414 fc |= IEEE80211_FCTL_TODS;
1416 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1417 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1418 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1421 case IEEE80211_IF_TYPE_IBSS:
1423 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1424 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1425 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1433 /* receiver is QoS enabled, use a QoS type frame */
1434 sta = sta_info_get(local, hdr.addr1);
1436 if (sta->flags & WLAN_STA_WME) {
1437 fc |= IEEE80211_STYPE_QOS_DATA;
1443 hdr.frame_control = cpu_to_le16(fc);
1444 hdr.duration_id = 0;
1447 skip_header_bytes = ETH_HLEN;
1448 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1449 encaps_data = bridge_tunnel_header;
1450 encaps_len = sizeof(bridge_tunnel_header);
1451 skip_header_bytes -= 2;
1452 } else if (ethertype >= 0x600) {
1453 encaps_data = rfc1042_header;
1454 encaps_len = sizeof(rfc1042_header);
1455 skip_header_bytes -= 2;
1461 skb_pull(skb, skip_header_bytes);
1462 nh_pos -= skip_header_bytes;
1463 h_pos -= skip_header_bytes;
1465 /* TODO: implement support for fragments so that there is no need to
1466 * reallocate and copy payload; it might be enough to support one
1467 * extra fragment that would be copied in the beginning of the frame
1468 * data.. anyway, it would be nice to include this into skb structure
1471 * There are few options for this:
1472 * use skb->cb as an extra space for 802.11 header
1473 * allocate new buffer if not enough headroom
1474 * make sure that there is enough headroom in every skb by increasing
1475 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1476 * alloc_skb() (net/core/skbuff.c)
1478 head_need = hdrlen + encaps_len + local->tx_headroom;
1479 head_need -= skb_headroom(skb);
1481 /* We are going to modify skb data, so make a copy of it if happens to
1482 * be cloned. This could happen, e.g., with Linux bridge code passing
1483 * us broadcast frames. */
1485 if (head_need > 0 || skb_cloned(skb)) {
1487 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1488 "of headroom\n", dev->name, head_need);
1491 if (skb_cloned(skb))
1492 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1494 I802_DEBUG_INC(local->tx_expand_skb_head);
1495 /* Since we have to reallocate the buffer, make sure that there
1496 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1497 * before payload and 12 after). */
1498 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1500 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1507 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1508 nh_pos += encaps_len;
1509 h_pos += encaps_len;
1512 if (fc & IEEE80211_STYPE_QOS_DATA) {
1513 __le16 *qos_control;
1515 qos_control = (__le16*) skb_push(skb, 2);
1516 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1518 * Maybe we could actually set some fields here, for now just
1519 * initialise to zero to indicate no special operation.
1523 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1528 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1529 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1530 pkt_data->ifindex = dev->ifindex;
1531 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1532 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1534 skb->dev = local->mdev;
1535 dev->stats.tx_packets++;
1536 dev->stats.tx_bytes += skb->len;
1538 /* Update skb pointers to various headers since this modified frame
1539 * is going to go through Linux networking code that may potentially
1540 * need things like pointer to IP header. */
1541 skb_set_mac_header(skb, 0);
1542 skb_set_network_header(skb, nh_pos);
1543 skb_set_transport_header(skb, h_pos);
1545 dev->trans_start = jiffies;
1546 dev_queue_xmit(skb);
1558 * This is the transmit routine for the 802.11 type interfaces
1559 * called by upper layers of the linux networking
1560 * stack when it has a frame to transmit
1562 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1564 struct ieee80211_sub_if_data *sdata;
1565 struct ieee80211_tx_packet_data *pkt_data;
1566 struct ieee80211_hdr *hdr;
1569 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1571 if (skb->len < 10) {
1576 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1577 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1584 hdr = (struct ieee80211_hdr *) skb->data;
1585 fc = le16_to_cpu(hdr->frame_control);
1587 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1588 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1589 pkt_data->ifindex = sdata->dev->ifindex;
1590 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1591 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1593 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1594 skb->dev = sdata->local->mdev;
1597 * We're using the protocol field of the the frame control header
1598 * to request TX callback for hostapd. BIT(1) is checked.
1600 if ((fc & BIT(1)) == BIT(1)) {
1601 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1603 hdr->frame_control = cpu_to_le16(fc);
1606 if (!(fc & IEEE80211_FCTL_PROTECTED))
1607 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1609 dev->stats.tx_packets++;
1610 dev->stats.tx_bytes += skb->len;
1612 dev_queue_xmit(skb);
1617 /* helper functions for pending packets for when queues are stopped */
1619 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1622 struct ieee80211_tx_stored_packet *store;
1624 for (i = 0; i < local->hw.queues; i++) {
1625 if (!__ieee80211_queue_pending(local, i))
1627 store = &local->pending_packet[i];
1628 kfree_skb(store->skb);
1629 for (j = 0; j < store->num_extra_frag; j++)
1630 kfree_skb(store->extra_frag[j]);
1631 kfree(store->extra_frag);
1632 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1636 void ieee80211_tx_pending(unsigned long data)
1638 struct ieee80211_local *local = (struct ieee80211_local *)data;
1639 struct net_device *dev = local->mdev;
1640 struct ieee80211_tx_stored_packet *store;
1641 struct ieee80211_txrx_data tx;
1642 int i, ret, reschedule = 0;
1644 netif_tx_lock_bh(dev);
1645 for (i = 0; i < local->hw.queues; i++) {
1646 if (__ieee80211_queue_stopped(local, i))
1648 if (!__ieee80211_queue_pending(local, i)) {
1652 store = &local->pending_packet[i];
1653 tx.u.tx.control = &store->control;
1654 tx.u.tx.extra_frag = store->extra_frag;
1655 tx.u.tx.num_extra_frag = store->num_extra_frag;
1656 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1657 tx.u.tx.last_frag_rate = store->last_frag_rate;
1659 if (store->last_frag_rate_ctrl_probe)
1660 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1661 ret = __ieee80211_tx(local, store->skb, &tx);
1663 if (ret == IEEE80211_TX_FRAG_AGAIN)
1666 clear_bit(IEEE80211_LINK_STATE_PENDING,
1671 netif_tx_unlock_bh(dev);
1673 if (!ieee80211_qdisc_installed(dev)) {
1674 if (!__ieee80211_queue_stopped(local, 0))
1675 netif_wake_queue(dev);
1677 netif_schedule(dev);
1681 /* functions for drivers to get certain frames */
1683 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1684 struct ieee80211_if_ap *bss,
1685 struct sk_buff *skb)
1689 int i, have_bits = 0, n1, n2;
1691 /* Generate bitmap for TIM only if there are any STAs in power save
1693 read_lock_bh(&local->sta_lock);
1694 if (atomic_read(&bss->num_sta_ps) > 0)
1695 /* in the hope that this is faster than
1696 * checking byte-for-byte */
1697 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1698 IEEE80211_MAX_AID+1);
1700 if (bss->dtim_count == 0)
1701 bss->dtim_count = bss->dtim_period - 1;
1705 tim = pos = (u8 *) skb_put(skb, 6);
1706 *pos++ = WLAN_EID_TIM;
1708 *pos++ = bss->dtim_count;
1709 *pos++ = bss->dtim_period;
1711 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1715 /* Find largest even number N1 so that bits numbered 1 through
1716 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1717 * (N2 + 1) x 8 through 2007 are 0. */
1719 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1726 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1733 /* Bitmap control */
1735 /* Part Virt Bitmap */
1736 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1738 tim[1] = n2 - n1 + 4;
1739 skb_put(skb, n2 - n1);
1741 *pos++ = aid0; /* Bitmap control */
1742 *pos++ = 0; /* Part Virt Bitmap */
1744 read_unlock_bh(&local->sta_lock);
1747 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1748 struct ieee80211_tx_control *control)
1750 struct ieee80211_local *local = hw_to_local(hw);
1751 struct sk_buff *skb;
1752 struct net_device *bdev;
1753 struct ieee80211_sub_if_data *sdata = NULL;
1754 struct ieee80211_if_ap *ap = NULL;
1755 struct ieee80211_rate *rate;
1756 struct rate_control_extra extra;
1757 u8 *b_head, *b_tail;
1760 bdev = dev_get_by_index(&init_net, if_id);
1762 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1767 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1769 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1770 if (net_ratelimit())
1771 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1772 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1773 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1777 /* Assume we are generating the normal beacon locally */
1778 b_head = ap->beacon_head;
1779 b_tail = ap->beacon_tail;
1780 bh_len = ap->beacon_head_len;
1781 bt_len = ap->beacon_tail_len;
1783 skb = dev_alloc_skb(local->tx_headroom +
1784 bh_len + bt_len + 256 /* maximum TIM len */);
1788 skb_reserve(skb, local->tx_headroom);
1789 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1791 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1793 ieee80211_beacon_add_tim(local, ap, skb);
1796 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1800 memset(&extra, 0, sizeof(extra));
1801 extra.mode = local->oper_hw_mode;
1803 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1805 if (net_ratelimit()) {
1806 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1807 "found\n", local->mdev->name);
1814 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1815 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1816 rate->val2 : rate->val;
1817 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1818 control->power_level = local->hw.conf.power_level;
1819 control->flags |= IEEE80211_TXCTL_NO_ACK;
1820 control->retry_limit = 1;
1821 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1827 EXPORT_SYMBOL(ieee80211_beacon_get);
1829 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1830 const void *frame, size_t frame_len,
1831 const struct ieee80211_tx_control *frame_txctl,
1832 struct ieee80211_rts *rts)
1834 const struct ieee80211_hdr *hdr = frame;
1837 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1838 rts->frame_control = cpu_to_le16(fctl);
1839 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1840 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1841 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1843 EXPORT_SYMBOL(ieee80211_rts_get);
1845 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1846 const void *frame, size_t frame_len,
1847 const struct ieee80211_tx_control *frame_txctl,
1848 struct ieee80211_cts *cts)
1850 const struct ieee80211_hdr *hdr = frame;
1853 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1854 cts->frame_control = cpu_to_le16(fctl);
1855 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1856 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1858 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1861 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1862 struct ieee80211_tx_control *control)
1864 struct ieee80211_local *local = hw_to_local(hw);
1865 struct sk_buff *skb;
1866 struct sta_info *sta;
1867 ieee80211_tx_handler *handler;
1868 struct ieee80211_txrx_data tx;
1869 ieee80211_txrx_result res = TXRX_DROP;
1870 struct net_device *bdev;
1871 struct ieee80211_sub_if_data *sdata;
1872 struct ieee80211_if_ap *bss = NULL;
1874 bdev = dev_get_by_index(&init_net, if_id);
1876 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1880 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1883 if (bss->dtim_count != 0)
1884 return NULL; /* send buffered bc/mc only after DTIM beacon */
1885 memset(control, 0, sizeof(*control));
1887 skb = skb_dequeue(&bss->ps_bc_buf);
1890 local->total_ps_buffered--;
1892 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1893 struct ieee80211_hdr *hdr =
1894 (struct ieee80211_hdr *) skb->data;
1895 /* more buffered multicast/broadcast frames ==> set
1896 * MoreData flag in IEEE 802.11 header to inform PS
1898 hdr->frame_control |=
1899 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1902 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1904 dev_kfree_skb_any(skb);
1907 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1908 tx.u.tx.mode = local->hw.conf.mode;
1910 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1911 res = (*handler)(&tx);
1912 if (res == TXRX_DROP || res == TXRX_QUEUED)
1916 skb = tx.skb; /* handlers are allowed to change skb */
1918 if (res == TXRX_DROP) {
1919 I802_DEBUG_INC(local->tx_handlers_drop);
1922 } else if (res == TXRX_QUEUED) {
1923 I802_DEBUG_INC(local->tx_handlers_queued);
1932 EXPORT_SYMBOL(ieee80211_get_buffered_bc);