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;
58 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
64 fc = le16_to_cpu(hdr->frame_control);
65 hdrlen = ieee80211_get_hdrlen(fc);
66 if (hdrlen > skb->len)
69 printk(" FC=0x%04x DUR=0x%04x",
70 fc, le16_to_cpu(hdr->duration_id));
72 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
74 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
76 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
78 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
81 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
82 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
86 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
88 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
91 int rate, mrate, erp, dur, i;
92 struct ieee80211_rate *txrate = tx->u.tx.rate;
93 struct ieee80211_local *local = tx->local;
94 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
96 erp = txrate->flags & IEEE80211_RATE_ERP;
99 * data and mgmt (except PS Poll):
100 * - during CFP: 32768
101 * - during contention period:
102 * if addr1 is group address: 0
103 * if more fragments = 0 and addr1 is individual address: time to
104 * transmit one ACK plus SIFS
105 * if more fragments = 1 and addr1 is individual address: time to
106 * transmit next fragment plus 2 x ACK plus 3 x SIFS
109 * - control response frame (CTS or ACK) shall be transmitted using the
110 * same rate as the immediately previous frame in the frame exchange
111 * sequence, if this rate belongs to the PHY mandatory rates, or else
112 * at the highest possible rate belonging to the PHY rates in the
116 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
117 /* TODO: These control frames are not currently sent by
118 * 80211.o, but should they be implemented, this function
119 * needs to be updated to support duration field calculation.
121 * RTS: time needed to transmit pending data/mgmt frame plus
122 * one CTS frame plus one ACK frame plus 3 x SIFS
123 * CTS: duration of immediately previous RTS minus time
124 * required to transmit CTS and its SIFS
125 * ACK: 0 if immediately previous directed data/mgmt had
126 * more=0, with more=1 duration in ACK frame is duration
127 * from previous frame minus time needed to transmit ACK
129 * PS Poll: BIT(15) | BIT(14) | aid
135 if (0 /* FIX: data/mgmt during CFP */)
138 if (group_addr) /* Group address as the destination - no ACK */
141 /* Individual destination address:
142 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
143 * CTS and ACK frames shall be transmitted using the highest rate in
144 * basic rate set that is less than or equal to the rate of the
145 * immediately previous frame and that is using the same modulation
146 * (CCK or OFDM). If no basic rate set matches with these requirements,
147 * the highest mandatory rate of the PHY that is less than or equal to
148 * the rate of the previous frame is used.
149 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
152 mrate = 10; /* use 1 Mbps if everything fails */
153 for (i = 0; i < mode->num_rates; i++) {
154 struct ieee80211_rate *r = &mode->rates[i];
155 if (r->rate > txrate->rate)
158 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
159 IEEE80211_RATE_MODULATION(r->flags))
162 if (r->flags & IEEE80211_RATE_BASIC)
164 else if (r->flags & IEEE80211_RATE_MANDATORY)
168 /* No matching basic rate found; use highest suitable mandatory
173 /* Time needed to transmit ACK
174 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
175 * to closest integer */
177 dur = ieee80211_frame_duration(local, 10, rate, erp,
178 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
181 /* Frame is fragmented: duration increases with time needed to
182 * transmit next fragment plus ACK and 2 x SIFS. */
183 dur *= 2; /* ACK + SIFS */
185 dur += ieee80211_frame_duration(local, next_frag_len,
188 IEEE80211_SDATA_SHORT_PREAMBLE);
194 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
197 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
200 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
203 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
206 static int inline is_ieee80211_device(struct net_device *dev,
207 struct net_device *master)
209 return (wdev_priv(dev->ieee80211_ptr) ==
210 wdev_priv(master->ieee80211_ptr));
215 static ieee80211_txrx_result
216 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
219 struct sk_buff *skb = tx->skb;
220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
221 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
224 if (unlikely(tx->local->sta_scanning != 0) &&
225 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
226 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
229 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
230 return TXRX_CONTINUE;
232 sta_flags = tx->sta ? tx->sta->flags : 0;
234 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
235 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
236 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
237 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
238 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 printk(KERN_DEBUG "%s: dropped data frame to not "
240 "associated station " MAC_FMT "\n",
241 tx->dev->name, MAC_ARG(hdr->addr1));
242 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
243 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
247 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
248 tx->local->num_sta == 0 &&
249 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
251 * No associated STAs - no need to send multicast
256 return TXRX_CONTINUE;
259 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
260 !(sta_flags & WLAN_STA_AUTHORIZED))) {
261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
263 " (unauthorized port)\n", tx->dev->name,
264 MAC_ARG(hdr->addr1));
266 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
270 return TXRX_CONTINUE;
273 static ieee80211_txrx_result
274 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
276 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
278 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
279 ieee80211_include_sequence(tx->sdata, hdr);
281 return TXRX_CONTINUE;
284 /* This function is called whenever the AP is about to exceed the maximum limit
285 * of buffered frames for power saving STAs. This situation should not really
286 * happen often during normal operation, so dropping the oldest buffered packet
287 * from each queue should be OK to make some room for new frames. */
288 static void purge_old_ps_buffers(struct ieee80211_local *local)
290 int total = 0, purged = 0;
292 struct ieee80211_sub_if_data *sdata;
293 struct sta_info *sta;
295 read_lock(&local->sub_if_lock);
296 list_for_each_entry(sdata, &local->sub_if_list, list) {
297 struct ieee80211_if_ap *ap;
298 if (sdata->dev == local->mdev ||
299 sdata->type != IEEE80211_IF_TYPE_AP)
302 skb = skb_dequeue(&ap->ps_bc_buf);
307 total += skb_queue_len(&ap->ps_bc_buf);
309 read_unlock(&local->sub_if_lock);
311 read_lock_bh(&local->sta_lock);
312 list_for_each_entry(sta, &local->sta_list, list) {
313 skb = skb_dequeue(&sta->ps_tx_buf);
318 total += skb_queue_len(&sta->ps_tx_buf);
320 read_unlock_bh(&local->sta_lock);
322 local->total_ps_buffered = total;
323 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
324 local->mdev->name, purged);
327 static inline ieee80211_txrx_result
328 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
330 /* broadcast/multicast frame */
331 /* If any of the associated stations is in power save mode,
332 * the frame is buffered to be sent after DTIM beacon frame */
333 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
334 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
335 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
336 !(tx->fc & IEEE80211_FCTL_ORDER)) {
337 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
338 purge_old_ps_buffers(tx->local);
339 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
341 if (net_ratelimit()) {
342 printk(KERN_DEBUG "%s: BC TX buffer full - "
343 "dropping the oldest frame\n",
346 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
348 tx->local->total_ps_buffered++;
349 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
353 return TXRX_CONTINUE;
356 static inline ieee80211_txrx_result
357 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
359 struct sta_info *sta = tx->sta;
362 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
363 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
364 return TXRX_CONTINUE;
366 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
367 struct ieee80211_tx_packet_data *pkt_data;
368 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
369 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
371 MAC_ARG(sta->addr), sta->aid,
372 skb_queue_len(&sta->ps_tx_buf));
373 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
374 sta->flags |= WLAN_STA_TIM;
375 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
376 purge_old_ps_buffers(tx->local);
377 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
378 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
379 if (net_ratelimit()) {
380 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
381 "buffer full - dropping oldest frame\n",
382 tx->dev->name, MAC_ARG(sta->addr));
386 tx->local->total_ps_buffered++;
387 /* Queue frame to be sent after STA sends an PS Poll frame */
388 if (skb_queue_empty(&sta->ps_tx_buf)) {
389 if (tx->local->ops->set_tim)
390 tx->local->ops->set_tim(local_to_hw(tx->local),
393 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
395 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
396 pkt_data->jiffies = jiffies;
397 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
400 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 else if (unlikely(sta->flags & WLAN_STA_PS)) {
402 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
403 "set -> send frame\n", tx->dev->name,
406 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
409 return TXRX_CONTINUE;
413 static ieee80211_txrx_result
414 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
416 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
417 return TXRX_CONTINUE;
419 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
420 return ieee80211_tx_h_unicast_ps_buf(tx);
422 return ieee80211_tx_h_multicast_ps_buf(tx);
428 static ieee80211_txrx_result
429 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
431 struct ieee80211_key *key;
433 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
435 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
437 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
439 else if ((key = rcu_dereference(tx->sdata->default_key)))
441 else if (tx->sdata->drop_unencrypted &&
442 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
443 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
449 tx->key->tx_rx_count++;
450 if (unlikely(tx->local->key_tx_rx_threshold &&
451 tx->key->tx_rx_count >
452 tx->local->key_tx_rx_threshold)) {
453 ieee80211_key_threshold_notify(tx->dev, tx->key,
458 return TXRX_CONTINUE;
461 static ieee80211_txrx_result
462 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
465 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
466 struct sk_buff **frags, *first, *frag;
470 int frag_threshold = tx->local->fragmentation_threshold;
472 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
473 return TXRX_CONTINUE;
477 hdrlen = ieee80211_get_hdrlen(tx->fc);
478 payload_len = first->len - hdrlen;
479 per_fragm = frag_threshold - hdrlen - FCS_LEN;
480 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
482 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
486 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
487 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
488 pos = first->data + hdrlen + per_fragm;
489 left = payload_len - per_fragm;
490 for (i = 0; i < num_fragm - 1; i++) {
491 struct ieee80211_hdr *fhdr;
497 /* reserve enough extra head and tail room for possible
500 dev_alloc_skb(tx->local->tx_headroom +
502 IEEE80211_ENCRYPT_HEADROOM +
503 IEEE80211_ENCRYPT_TAILROOM);
506 /* Make sure that all fragments use the same priority so
507 * that they end up using the same TX queue */
508 frag->priority = first->priority;
509 skb_reserve(frag, tx->local->tx_headroom +
510 IEEE80211_ENCRYPT_HEADROOM);
511 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
512 memcpy(fhdr, first->data, hdrlen);
513 if (i == num_fragm - 2)
514 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
515 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
516 copylen = left > per_fragm ? per_fragm : left;
517 memcpy(skb_put(frag, copylen), pos, copylen);
522 skb_trim(first, hdrlen + per_fragm);
524 tx->u.tx.num_extra_frag = num_fragm - 1;
525 tx->u.tx.extra_frag = frags;
527 return TXRX_CONTINUE;
530 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
532 for (i = 0; i < num_fragm - 1; i++)
534 dev_kfree_skb(frags[i]);
537 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
541 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
543 if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
544 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
547 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
548 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
549 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
557 static ieee80211_txrx_result
558 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
560 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
563 fc = le16_to_cpu(hdr->frame_control);
565 if (!tx->key || tx->key->conf.alg != ALG_WEP ||
566 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
567 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
568 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
569 return TXRX_CONTINUE;
571 tx->u.tx.control->iv_len = WEP_IV_LEN;
572 tx->u.tx.control->icv_len = WEP_ICV_LEN;
573 ieee80211_tx_set_iswep(tx);
575 if (wep_encrypt_skb(tx, tx->skb) < 0) {
576 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
580 if (tx->u.tx.extra_frag) {
582 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
583 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
584 I802_DEBUG_INC(tx->local->
585 tx_handlers_drop_wep);
591 return TXRX_CONTINUE;
594 static ieee80211_txrx_result
595 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
597 struct rate_control_extra extra;
599 memset(&extra, 0, sizeof(extra));
600 extra.mode = tx->u.tx.mode;
601 extra.mgmt_data = tx->sdata &&
602 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
603 extra.ethertype = tx->ethertype;
605 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
607 if (unlikely(extra.probe != NULL)) {
608 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
609 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
610 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
611 tx->u.tx.rate = extra.probe;
613 tx->u.tx.control->alt_retry_rate = -1;
617 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
618 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
619 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
620 tx->u.tx.last_frag_rate = tx->u.tx.rate;
622 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
624 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
625 tx->u.tx.rate = extra.nonerp;
626 tx->u.tx.control->rate = extra.nonerp;
627 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
629 tx->u.tx.last_frag_rate = tx->u.tx.rate;
630 tx->u.tx.control->rate = tx->u.tx.rate;
632 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
634 return TXRX_CONTINUE;
637 static ieee80211_txrx_result
638 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
640 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
641 u16 fc = le16_to_cpu(hdr->frame_control);
643 struct ieee80211_tx_control *control = tx->u.tx.control;
644 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
646 if (!is_multicast_ether_addr(hdr->addr1)) {
647 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
648 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
649 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
650 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
651 control->retry_limit =
652 tx->local->long_retry_limit;
654 control->retry_limit =
655 tx->local->short_retry_limit;
658 control->retry_limit = 1;
661 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
662 /* Do not use multiple retry rates when sending fragmented
664 * TODO: The last fragment could still use multiple retry
666 control->alt_retry_rate = -1;
669 /* Use CTS protection for unicast frames sent using extended rates if
670 * there are associated non-ERP stations and RTS/CTS is not configured
672 if (mode->mode == MODE_IEEE80211G &&
673 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
674 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
675 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
676 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
677 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
679 /* Transmit data frames using short preambles if the driver supports
680 * short preambles at the selected rate and short preambles are
681 * available on the network at the current point in time. */
682 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
683 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
684 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
685 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
686 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
689 /* Setup duration field for the first fragment of the frame. Duration
690 * for remaining fragments will be updated when they are being sent
691 * to low-level driver in ieee80211_tx(). */
692 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
693 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
694 tx->u.tx.extra_frag[0]->len : 0);
695 hdr->duration_id = cpu_to_le16(dur);
697 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
698 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
699 struct ieee80211_rate *rate;
701 /* Do not use multiple retry rates when using RTS/CTS */
702 control->alt_retry_rate = -1;
704 /* Use min(data rate, max base rate) as CTS/RTS rate */
705 rate = tx->u.tx.rate;
706 while (rate > mode->rates &&
707 !(rate->flags & IEEE80211_RATE_BASIC))
710 control->rts_cts_rate = rate->val;
711 control->rts_rate = rate;
715 tx->sta->tx_packets++;
716 tx->sta->tx_fragments++;
717 tx->sta->tx_bytes += tx->skb->len;
718 if (tx->u.tx.extra_frag) {
720 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
721 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
723 tx->u.tx.extra_frag[i]->len;
728 return TXRX_CONTINUE;
731 static ieee80211_txrx_result
732 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
734 struct ieee80211_local *local = tx->local;
735 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
736 struct sk_buff *skb = tx->skb;
737 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
738 u32 load = 0, hdrtime;
740 /* TODO: this could be part of tx_status handling, so that the number
741 * of retries would be known; TX rate should in that case be stored
742 * somewhere with the packet */
744 /* Estimate total channel use caused by this frame */
746 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
747 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
749 if (mode->mode == MODE_IEEE80211A ||
750 mode->mode == MODE_ATHEROS_TURBO ||
751 mode->mode == MODE_ATHEROS_TURBOG ||
752 (mode->mode == MODE_IEEE80211G &&
753 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
754 hdrtime = CHAN_UTIL_HDR_SHORT;
756 hdrtime = CHAN_UTIL_HDR_LONG;
759 if (!is_multicast_ether_addr(hdr->addr1))
762 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
764 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
767 load += skb->len * tx->u.tx.rate->rate_inv;
769 if (tx->u.tx.extra_frag) {
771 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
773 load += tx->u.tx.extra_frag[i]->len *
778 /* Divide channel_use by 8 to avoid wrapping around the counter */
779 load >>= CHAN_UTIL_SHIFT;
780 local->channel_use_raw += load;
782 tx->sta->channel_use_raw += load;
783 tx->sdata->channel_use_raw += load;
785 return TXRX_CONTINUE;
788 /* TODO: implement register/unregister functions for adding TX/RX handlers
789 * into ordered list */
791 ieee80211_tx_handler ieee80211_tx_handlers[] =
793 ieee80211_tx_h_check_assoc,
794 ieee80211_tx_h_sequence,
795 ieee80211_tx_h_ps_buf,
796 ieee80211_tx_h_select_key,
797 ieee80211_tx_h_michael_mic_add,
798 ieee80211_tx_h_fragment,
799 ieee80211_tx_h_tkip_encrypt,
800 ieee80211_tx_h_ccmp_encrypt,
801 ieee80211_tx_h_wep_encrypt,
802 ieee80211_tx_h_rate_ctrl,
804 ieee80211_tx_h_load_stats,
808 /* actual transmit path */
811 * deal with packet injection down monitor interface
812 * with Radiotap Header -- only called for monitor mode interface
814 static ieee80211_txrx_result
815 __ieee80211_parse_tx_radiotap(
816 struct ieee80211_txrx_data *tx,
817 struct sk_buff *skb, struct ieee80211_tx_control *control)
820 * this is the moment to interpret and discard the radiotap header that
821 * must be at the start of the packet injected in Monitor mode
823 * Need to take some care with endian-ness since radiotap
824 * args are little-endian
827 struct ieee80211_radiotap_iterator iterator;
828 struct ieee80211_radiotap_header *rthdr =
829 (struct ieee80211_radiotap_header *) skb->data;
830 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
831 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
834 * default control situation for all injected packets
835 * FIXME: this does not suit all usage cases, expand to allow control
838 control->retry_limit = 1; /* no retry */
839 control->key_idx = HW_KEY_IDX_INVALID;
840 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
841 IEEE80211_TXCTL_USE_CTS_PROTECT);
842 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
843 IEEE80211_TXCTL_NO_ACK;
844 control->antenna_sel_tx = 0; /* default to default antenna */
847 * for every radiotap entry that is present
848 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
849 * entries present, or -EINVAL on error)
855 ret = ieee80211_radiotap_iterator_next(&iterator);
860 /* see if this argument is something we can use */
861 switch (iterator.this_arg_index) {
863 * You must take care when dereferencing iterator.this_arg
864 * for multibyte types... the pointer is not aligned. Use
865 * get_unaligned((type *)iterator.this_arg) to dereference
866 * iterator.this_arg for type "type" safely on all arches.
868 case IEEE80211_RADIOTAP_RATE:
870 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
871 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
873 target_rate = (*iterator.this_arg) * 5;
874 for (i = 0; i < mode->num_rates; i++) {
875 struct ieee80211_rate *r = &mode->rates[i];
877 if (r->rate > target_rate)
882 if (r->flags & IEEE80211_RATE_PREAMBLE2)
883 control->tx_rate = r->val2;
885 control->tx_rate = r->val;
887 /* end on exact match */
888 if (r->rate == target_rate)
893 case IEEE80211_RADIOTAP_ANTENNA:
895 * radiotap uses 0 for 1st ant, mac80211 is 1 for
898 control->antenna_sel_tx = (*iterator.this_arg) + 1;
901 case IEEE80211_RADIOTAP_DBM_TX_POWER:
902 control->power_level = *iterator.this_arg;
905 case IEEE80211_RADIOTAP_FLAGS:
906 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
908 * this indicates that the skb we have been
909 * handed has the 32-bit FCS CRC at the end...
910 * we should react to that by snipping it off
911 * because it will be recomputed and added
914 if (skb->len < (iterator.max_length + FCS_LEN))
917 skb_trim(skb, skb->len - FCS_LEN);
926 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
930 * remove the radiotap header
931 * iterator->max_length was sanity-checked against
932 * skb->len by iterator init
934 skb_pull(skb, iterator.max_length);
936 return TXRX_CONTINUE;
939 static ieee80211_txrx_result inline
940 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
942 struct net_device *dev,
943 struct ieee80211_tx_control *control)
945 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
946 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
947 struct ieee80211_sub_if_data *sdata;
948 ieee80211_txrx_result res = TXRX_CONTINUE;
952 memset(tx, 0, sizeof(*tx));
954 tx->dev = dev; /* use original interface */
956 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
957 tx->sta = sta_info_get(local, hdr->addr1);
958 tx->fc = le16_to_cpu(hdr->frame_control);
961 * set defaults for things that can be set by
962 * injected radiotap headers
964 control->power_level = local->hw.conf.power_level;
965 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
967 /* process and remove the injection radiotap header */
968 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
969 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
970 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
975 * we removed the radiotap header after this point,
976 * we filled control with what we could use
977 * set to the actual ieee header now
979 hdr = (struct ieee80211_hdr *) skb->data;
980 res = TXRX_QUEUED; /* indication it was monitor packet */
983 tx->u.tx.control = control;
984 if (is_multicast_ether_addr(hdr->addr1)) {
985 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
986 control->flags |= IEEE80211_TXCTL_NO_ACK;
988 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
989 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
991 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
992 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
993 skb->len + FCS_LEN > local->fragmentation_threshold &&
994 !local->ops->set_frag_threshold)
995 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
997 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
999 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1000 else if (tx->sta->clear_dst_mask) {
1001 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1002 tx->sta->clear_dst_mask = 0;
1004 hdrlen = ieee80211_get_hdrlen(tx->fc);
1005 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1006 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1007 tx->ethertype = (pos[0] << 8) | pos[1];
1009 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1014 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1015 * finished with it. */
1016 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1017 struct sk_buff *skb,
1018 struct net_device *mdev,
1019 struct ieee80211_tx_control *control)
1021 struct ieee80211_tx_packet_data *pkt_data;
1022 struct net_device *dev;
1024 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1025 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1026 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1032 __ieee80211_tx_prepare(tx, skb, dev, control);
1036 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1037 struct ieee80211_txrx_data *tx)
1039 struct ieee80211_tx_control *control = tx->u.tx.control;
1042 if (!ieee80211_qdisc_installed(local->mdev) &&
1043 __ieee80211_queue_stopped(local, 0)) {
1044 netif_stop_queue(local->mdev);
1045 return IEEE80211_TX_AGAIN;
1048 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1049 ret = local->ops->tx(local_to_hw(local), skb, control);
1051 return IEEE80211_TX_AGAIN;
1052 local->mdev->trans_start = jiffies;
1053 ieee80211_led_tx(local, 1);
1055 if (tx->u.tx.extra_frag) {
1056 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1057 IEEE80211_TXCTL_USE_CTS_PROTECT |
1058 IEEE80211_TXCTL_CLEAR_DST_MASK |
1059 IEEE80211_TXCTL_FIRST_FRAGMENT);
1060 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1061 if (!tx->u.tx.extra_frag[i])
1063 if (__ieee80211_queue_stopped(local, control->queue))
1064 return IEEE80211_TX_FRAG_AGAIN;
1065 if (i == tx->u.tx.num_extra_frag) {
1066 control->tx_rate = tx->u.tx.last_frag_hwrate;
1067 control->rate = tx->u.tx.last_frag_rate;
1068 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1070 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1073 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1076 ieee80211_dump_frame(local->mdev->name,
1077 "TX to low-level driver",
1078 tx->u.tx.extra_frag[i]);
1079 ret = local->ops->tx(local_to_hw(local),
1080 tx->u.tx.extra_frag[i],
1083 return IEEE80211_TX_FRAG_AGAIN;
1084 local->mdev->trans_start = jiffies;
1085 ieee80211_led_tx(local, 1);
1086 tx->u.tx.extra_frag[i] = NULL;
1088 kfree(tx->u.tx.extra_frag);
1089 tx->u.tx.extra_frag = NULL;
1091 return IEEE80211_TX_OK;
1094 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1095 struct ieee80211_tx_control *control, int mgmt)
1097 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1098 struct sta_info *sta;
1099 ieee80211_tx_handler *handler;
1100 struct ieee80211_txrx_data tx;
1101 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1104 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1106 if (unlikely(skb->len < 10)) {
1111 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1113 if (res_prepare == TXRX_DROP) {
1119 * key references are protected using RCU and this requires that
1120 * we are in a read-site RCU section during receive processing
1125 tx.u.tx.mgmt_interface = mgmt;
1126 tx.u.tx.mode = local->hw.conf.mode;
1128 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1129 res = TXRX_CONTINUE;
1131 for (handler = local->tx_handlers; *handler != NULL;
1133 res = (*handler)(&tx);
1134 if (res != TXRX_CONTINUE)
1139 skb = tx.skb; /* handlers are allowed to change skb */
1144 if (unlikely(res == TXRX_DROP)) {
1145 I802_DEBUG_INC(local->tx_handlers_drop);
1149 if (unlikely(res == TXRX_QUEUED)) {
1150 I802_DEBUG_INC(local->tx_handlers_queued);
1155 if (tx.u.tx.extra_frag) {
1156 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1158 struct ieee80211_hdr *hdr =
1159 (struct ieee80211_hdr *)
1160 tx.u.tx.extra_frag[i]->data;
1162 if (i + 1 < tx.u.tx.num_extra_frag) {
1163 next_len = tx.u.tx.extra_frag[i + 1]->len;
1166 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1167 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1169 dur = ieee80211_duration(&tx, 0, next_len);
1170 hdr->duration_id = cpu_to_le16(dur);
1175 ret = __ieee80211_tx(local, skb, &tx);
1177 struct ieee80211_tx_stored_packet *store =
1178 &local->pending_packet[control->queue];
1180 if (ret == IEEE80211_TX_FRAG_AGAIN)
1182 set_bit(IEEE80211_LINK_STATE_PENDING,
1183 &local->state[control->queue]);
1185 /* When the driver gets out of buffers during sending of
1186 * fragments and calls ieee80211_stop_queue, there is
1187 * a small window between IEEE80211_LINK_STATE_XOFF and
1188 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1189 * gets available in that window (i.e. driver calls
1190 * ieee80211_wake_queue), we would end up with ieee80211_tx
1191 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1192 * continuing transmitting here when that situation is
1193 * possible to have happened. */
1194 if (!__ieee80211_queue_stopped(local, control->queue)) {
1195 clear_bit(IEEE80211_LINK_STATE_PENDING,
1196 &local->state[control->queue]);
1199 memcpy(&store->control, control,
1200 sizeof(struct ieee80211_tx_control));
1202 store->extra_frag = tx.u.tx.extra_frag;
1203 store->num_extra_frag = tx.u.tx.num_extra_frag;
1204 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1205 store->last_frag_rate = tx.u.tx.last_frag_rate;
1206 store->last_frag_rate_ctrl_probe =
1207 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1215 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1216 if (tx.u.tx.extra_frag[i])
1217 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1218 kfree(tx.u.tx.extra_frag);
1223 /* device xmit handlers */
1225 int ieee80211_master_start_xmit(struct sk_buff *skb,
1226 struct net_device *dev)
1228 struct ieee80211_tx_control control;
1229 struct ieee80211_tx_packet_data *pkt_data;
1230 struct net_device *odev = NULL;
1231 struct ieee80211_sub_if_data *osdata;
1236 * copy control out of the skb so other people can use skb->cb
1238 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1239 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1241 if (pkt_data->ifindex)
1242 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1243 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1247 if (unlikely(!odev)) {
1248 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1249 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1250 "originating device\n", dev->name);
1255 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1257 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1258 if (skb_headroom(skb) < headroom) {
1259 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1266 control.ifindex = odev->ifindex;
1267 control.type = osdata->type;
1268 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1269 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1270 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1271 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1272 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1273 control.flags |= IEEE80211_TXCTL_REQUEUE;
1274 control.queue = pkt_data->queue;
1276 ret = ieee80211_tx(odev, skb, &control,
1277 control.type == IEEE80211_IF_TYPE_MGMT);
1283 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1284 struct net_device *dev)
1286 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1287 struct ieee80211_tx_packet_data *pkt_data;
1288 struct ieee80211_radiotap_header *prthdr =
1289 (struct ieee80211_radiotap_header *)skb->data;
1292 /* check for not even having the fixed radiotap header part */
1293 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1294 goto fail; /* too short to be possibly valid */
1296 /* is it a header version we can trust to find length from? */
1297 if (unlikely(prthdr->it_version))
1298 goto fail; /* only version 0 is supported */
1300 /* then there must be a radiotap header with a length we can use */
1301 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1303 /* does the skb contain enough to deliver on the alleged length? */
1304 if (unlikely(skb->len < len_rthdr))
1305 goto fail; /* skb too short for claimed rt header extent */
1307 skb->dev = local->mdev;
1309 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1310 memset(pkt_data, 0, sizeof(*pkt_data));
1311 /* needed because we set skb device to master */
1312 pkt_data->ifindex = dev->ifindex;
1314 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1317 * fix up the pointers accounting for the radiotap
1318 * header still being in there. We are being given
1319 * a precooked IEEE80211 header so no need for
1322 skb_set_mac_header(skb, len_rthdr);
1324 * these are just fixed to the end of the rt area since we
1325 * don't have any better information and at this point, nobody cares
1327 skb_set_network_header(skb, len_rthdr);
1328 skb_set_transport_header(skb, len_rthdr);
1330 /* pass the radiotap header up to the next stage intact */
1331 dev_queue_xmit(skb);
1332 return NETDEV_TX_OK;
1336 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1340 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1341 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1342 * @skb: packet to be sent
1343 * @dev: incoming interface
1345 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1346 * not be freed, and caller is responsible for either retrying later or freeing
1349 * This function takes in an Ethernet header and encapsulates it with suitable
1350 * IEEE 802.11 header based on which interface the packet is coming in. The
1351 * encapsulated packet will then be passed to master interface, wlan#.11, for
1352 * transmission (through low-level driver).
1354 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1355 struct net_device *dev)
1357 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1358 struct ieee80211_tx_packet_data *pkt_data;
1359 struct ieee80211_sub_if_data *sdata;
1360 int ret = 1, head_need;
1361 u16 ethertype, hdrlen, fc;
1362 struct ieee80211_hdr hdr;
1363 const u8 *encaps_data;
1364 int encaps_len, skip_header_bytes;
1366 struct sta_info *sta;
1368 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1369 if (unlikely(skb->len < ETH_HLEN)) {
1370 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1371 dev->name, skb->len);
1376 nh_pos = skb_network_header(skb) - skb->data;
1377 h_pos = skb_transport_header(skb) - skb->data;
1379 /* convert Ethernet header to proper 802.11 header (based on
1380 * operation mode) */
1381 ethertype = (skb->data[12] << 8) | skb->data[13];
1382 /* TODO: handling for 802.1x authorized/unauthorized port */
1383 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1385 switch (sdata->type) {
1386 case IEEE80211_IF_TYPE_AP:
1387 case IEEE80211_IF_TYPE_VLAN:
1388 fc |= IEEE80211_FCTL_FROMDS;
1390 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1391 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1392 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1395 case IEEE80211_IF_TYPE_WDS:
1396 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1398 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1399 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1400 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1401 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1404 case IEEE80211_IF_TYPE_STA:
1405 fc |= IEEE80211_FCTL_TODS;
1407 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1408 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1409 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1412 case IEEE80211_IF_TYPE_IBSS:
1414 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1415 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1416 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1424 /* receiver is QoS enabled, use a QoS type frame */
1425 sta = sta_info_get(local, hdr.addr1);
1427 if (sta->flags & WLAN_STA_WME) {
1428 fc |= IEEE80211_STYPE_QOS_DATA;
1434 hdr.frame_control = cpu_to_le16(fc);
1435 hdr.duration_id = 0;
1438 skip_header_bytes = ETH_HLEN;
1439 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1440 encaps_data = bridge_tunnel_header;
1441 encaps_len = sizeof(bridge_tunnel_header);
1442 skip_header_bytes -= 2;
1443 } else if (ethertype >= 0x600) {
1444 encaps_data = rfc1042_header;
1445 encaps_len = sizeof(rfc1042_header);
1446 skip_header_bytes -= 2;
1452 skb_pull(skb, skip_header_bytes);
1453 nh_pos -= skip_header_bytes;
1454 h_pos -= skip_header_bytes;
1456 /* TODO: implement support for fragments so that there is no need to
1457 * reallocate and copy payload; it might be enough to support one
1458 * extra fragment that would be copied in the beginning of the frame
1459 * data.. anyway, it would be nice to include this into skb structure
1462 * There are few options for this:
1463 * use skb->cb as an extra space for 802.11 header
1464 * allocate new buffer if not enough headroom
1465 * make sure that there is enough headroom in every skb by increasing
1466 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1467 * alloc_skb() (net/core/skbuff.c)
1469 head_need = hdrlen + encaps_len + local->tx_headroom;
1470 head_need -= skb_headroom(skb);
1472 /* We are going to modify skb data, so make a copy of it if happens to
1473 * be cloned. This could happen, e.g., with Linux bridge code passing
1474 * us broadcast frames. */
1476 if (head_need > 0 || skb_cloned(skb)) {
1478 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1479 "of headroom\n", dev->name, head_need);
1482 if (skb_cloned(skb))
1483 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1485 I802_DEBUG_INC(local->tx_expand_skb_head);
1486 /* Since we have to reallocate the buffer, make sure that there
1487 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1488 * before payload and 12 after). */
1489 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1491 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1498 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1499 nh_pos += encaps_len;
1500 h_pos += encaps_len;
1503 if (fc & IEEE80211_STYPE_QOS_DATA) {
1504 __le16 *qos_control;
1506 qos_control = (__le16*) skb_push(skb, 2);
1507 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1509 * Maybe we could actually set some fields here, for now just
1510 * initialise to zero to indicate no special operation.
1514 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1519 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1520 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1521 pkt_data->ifindex = dev->ifindex;
1522 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1523 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1525 skb->dev = local->mdev;
1526 sdata->stats.tx_packets++;
1527 sdata->stats.tx_bytes += skb->len;
1529 /* Update skb pointers to various headers since this modified frame
1530 * is going to go through Linux networking code that may potentially
1531 * need things like pointer to IP header. */
1532 skb_set_mac_header(skb, 0);
1533 skb_set_network_header(skb, nh_pos);
1534 skb_set_transport_header(skb, h_pos);
1536 dev->trans_start = jiffies;
1537 dev_queue_xmit(skb);
1549 * This is the transmit routine for the 802.11 type interfaces
1550 * called by upper layers of the linux networking
1551 * stack when it has a frame to transmit
1553 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1555 struct ieee80211_sub_if_data *sdata;
1556 struct ieee80211_tx_packet_data *pkt_data;
1557 struct ieee80211_hdr *hdr;
1560 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1562 if (skb->len < 10) {
1567 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1568 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1575 hdr = (struct ieee80211_hdr *) skb->data;
1576 fc = le16_to_cpu(hdr->frame_control);
1578 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1579 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1580 pkt_data->ifindex = sdata->dev->ifindex;
1581 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1582 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1584 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1585 skb->dev = sdata->local->mdev;
1588 * We're using the protocol field of the the frame control header
1589 * to request TX callback for hostapd. BIT(1) is checked.
1591 if ((fc & BIT(1)) == BIT(1)) {
1592 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1594 hdr->frame_control = cpu_to_le16(fc);
1597 if (!(fc & IEEE80211_FCTL_PROTECTED))
1598 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1600 sdata->stats.tx_packets++;
1601 sdata->stats.tx_bytes += skb->len;
1603 dev_queue_xmit(skb);
1608 /* helper functions for pending packets for when queues are stopped */
1610 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1613 struct ieee80211_tx_stored_packet *store;
1615 for (i = 0; i < local->hw.queues; i++) {
1616 if (!__ieee80211_queue_pending(local, i))
1618 store = &local->pending_packet[i];
1619 kfree_skb(store->skb);
1620 for (j = 0; j < store->num_extra_frag; j++)
1621 kfree_skb(store->extra_frag[j]);
1622 kfree(store->extra_frag);
1623 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1627 void ieee80211_tx_pending(unsigned long data)
1629 struct ieee80211_local *local = (struct ieee80211_local *)data;
1630 struct net_device *dev = local->mdev;
1631 struct ieee80211_tx_stored_packet *store;
1632 struct ieee80211_txrx_data tx;
1633 int i, ret, reschedule = 0;
1635 netif_tx_lock_bh(dev);
1636 for (i = 0; i < local->hw.queues; i++) {
1637 if (__ieee80211_queue_stopped(local, i))
1639 if (!__ieee80211_queue_pending(local, i)) {
1643 store = &local->pending_packet[i];
1644 tx.u.tx.control = &store->control;
1645 tx.u.tx.extra_frag = store->extra_frag;
1646 tx.u.tx.num_extra_frag = store->num_extra_frag;
1647 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1648 tx.u.tx.last_frag_rate = store->last_frag_rate;
1650 if (store->last_frag_rate_ctrl_probe)
1651 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1652 ret = __ieee80211_tx(local, store->skb, &tx);
1654 if (ret == IEEE80211_TX_FRAG_AGAIN)
1657 clear_bit(IEEE80211_LINK_STATE_PENDING,
1662 netif_tx_unlock_bh(dev);
1664 if (!ieee80211_qdisc_installed(dev)) {
1665 if (!__ieee80211_queue_stopped(local, 0))
1666 netif_wake_queue(dev);
1668 netif_schedule(dev);
1672 /* functions for drivers to get certain frames */
1674 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1675 struct ieee80211_if_ap *bss,
1676 struct sk_buff *skb)
1680 int i, have_bits = 0, n1, n2;
1682 /* Generate bitmap for TIM only if there are any STAs in power save
1684 read_lock_bh(&local->sta_lock);
1685 if (atomic_read(&bss->num_sta_ps) > 0)
1686 /* in the hope that this is faster than
1687 * checking byte-for-byte */
1688 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1689 IEEE80211_MAX_AID+1);
1691 if (bss->dtim_count == 0)
1692 bss->dtim_count = bss->dtim_period - 1;
1696 tim = pos = (u8 *) skb_put(skb, 6);
1697 *pos++ = WLAN_EID_TIM;
1699 *pos++ = bss->dtim_count;
1700 *pos++ = bss->dtim_period;
1702 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1706 /* Find largest even number N1 so that bits numbered 1 through
1707 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1708 * (N2 + 1) x 8 through 2007 are 0. */
1710 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1717 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1724 /* Bitmap control */
1726 /* Part Virt Bitmap */
1727 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1729 tim[1] = n2 - n1 + 4;
1730 skb_put(skb, n2 - n1);
1732 *pos++ = aid0; /* Bitmap control */
1733 *pos++ = 0; /* Part Virt Bitmap */
1735 read_unlock_bh(&local->sta_lock);
1738 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1739 struct ieee80211_tx_control *control)
1741 struct ieee80211_local *local = hw_to_local(hw);
1742 struct sk_buff *skb;
1743 struct net_device *bdev;
1744 struct ieee80211_sub_if_data *sdata = NULL;
1745 struct ieee80211_if_ap *ap = NULL;
1746 struct ieee80211_rate *rate;
1747 struct rate_control_extra extra;
1748 u8 *b_head, *b_tail;
1751 bdev = dev_get_by_index(&init_net, if_id);
1753 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1758 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1760 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1761 if (net_ratelimit())
1762 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1763 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1764 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1768 /* Assume we are generating the normal beacon locally */
1769 b_head = ap->beacon_head;
1770 b_tail = ap->beacon_tail;
1771 bh_len = ap->beacon_head_len;
1772 bt_len = ap->beacon_tail_len;
1774 skb = dev_alloc_skb(local->tx_headroom +
1775 bh_len + bt_len + 256 /* maximum TIM len */);
1779 skb_reserve(skb, local->tx_headroom);
1780 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1782 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1784 ieee80211_beacon_add_tim(local, ap, skb);
1787 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1791 memset(&extra, 0, sizeof(extra));
1792 extra.mode = local->oper_hw_mode;
1794 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1796 if (net_ratelimit()) {
1797 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1798 "found\n", local->mdev->name);
1805 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1806 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1807 rate->val2 : rate->val;
1808 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1809 control->power_level = local->hw.conf.power_level;
1810 control->flags |= IEEE80211_TXCTL_NO_ACK;
1811 control->retry_limit = 1;
1812 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1818 EXPORT_SYMBOL(ieee80211_beacon_get);
1820 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1821 const void *frame, size_t frame_len,
1822 const struct ieee80211_tx_control *frame_txctl,
1823 struct ieee80211_rts *rts)
1825 const struct ieee80211_hdr *hdr = frame;
1828 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1829 rts->frame_control = cpu_to_le16(fctl);
1830 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1831 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1832 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1834 EXPORT_SYMBOL(ieee80211_rts_get);
1836 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1837 const void *frame, size_t frame_len,
1838 const struct ieee80211_tx_control *frame_txctl,
1839 struct ieee80211_cts *cts)
1841 const struct ieee80211_hdr *hdr = frame;
1844 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1845 cts->frame_control = cpu_to_le16(fctl);
1846 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1847 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1849 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1852 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1853 struct ieee80211_tx_control *control)
1855 struct ieee80211_local *local = hw_to_local(hw);
1856 struct sk_buff *skb;
1857 struct sta_info *sta;
1858 ieee80211_tx_handler *handler;
1859 struct ieee80211_txrx_data tx;
1860 ieee80211_txrx_result res = TXRX_DROP;
1861 struct net_device *bdev;
1862 struct ieee80211_sub_if_data *sdata;
1863 struct ieee80211_if_ap *bss = NULL;
1865 bdev = dev_get_by_index(&init_net, if_id);
1867 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1871 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1874 if (bss->dtim_count != 0)
1875 return NULL; /* send buffered bc/mc only after DTIM beacon */
1876 memset(control, 0, sizeof(*control));
1878 skb = skb_dequeue(&bss->ps_bc_buf);
1881 local->total_ps_buffered--;
1883 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1884 struct ieee80211_hdr *hdr =
1885 (struct ieee80211_hdr *) skb->data;
1886 /* more buffered multicast/broadcast frames ==> set
1887 * MoreData flag in IEEE 802.11 header to inform PS
1889 hdr->frame_control |=
1890 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1893 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1895 dev_kfree_skb_any(skb);
1898 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1900 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1901 res = (*handler)(&tx);
1902 if (res == TXRX_DROP || res == TXRX_QUEUED)
1906 skb = tx.skb; /* handlers are allowed to change skb */
1908 if (res == TXRX_DROP) {
1909 I802_DEBUG_INC(local->tx_handlers_drop);
1912 } else if (res == TXRX_QUEUED) {
1913 I802_DEBUG_INC(local->tx_handlers_queued);
1922 EXPORT_SYMBOL(ieee80211_get_buffered_bc);