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 <net/ieee80211_radiotap.h>
21 #include <net/cfg80211.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "ieee80211_led.h"
30 #include "ieee80211_rate.h"
32 #define IEEE80211_TX_OK 0
33 #define IEEE80211_TX_AGAIN 1
34 #define IEEE80211_TX_FRAG_AGAIN 2
38 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
39 struct ieee80211_hdr *hdr)
41 /* Set the sequence number for this frame. */
42 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
44 /* Increase the sequence number. */
45 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
48 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
49 static void ieee80211_dump_frame(const char *ifname, const char *title,
50 const struct sk_buff *skb)
52 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
56 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
62 fc = le16_to_cpu(hdr->frame_control);
63 hdrlen = ieee80211_get_hdrlen(fc);
64 if (hdrlen > skb->len)
67 printk(" FC=0x%04x DUR=0x%04x",
68 fc, le16_to_cpu(hdr->duration_id));
70 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
72 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
74 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
76 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
79 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
80 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
84 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
86 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
89 int rate, mrate, erp, dur, i;
90 struct ieee80211_rate *txrate = tx->u.tx.rate;
91 struct ieee80211_local *local = tx->local;
92 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
94 erp = txrate->flags & IEEE80211_RATE_ERP;
97 * data and mgmt (except PS Poll):
99 * - during contention period:
100 * if addr1 is group address: 0
101 * if more fragments = 0 and addr1 is individual address: time to
102 * transmit one ACK plus SIFS
103 * if more fragments = 1 and addr1 is individual address: time to
104 * transmit next fragment plus 2 x ACK plus 3 x SIFS
107 * - control response frame (CTS or ACK) shall be transmitted using the
108 * same rate as the immediately previous frame in the frame exchange
109 * sequence, if this rate belongs to the PHY mandatory rates, or else
110 * at the highest possible rate belonging to the PHY rates in the
114 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
115 /* TODO: These control frames are not currently sent by
116 * 80211.o, but should they be implemented, this function
117 * needs to be updated to support duration field calculation.
119 * RTS: time needed to transmit pending data/mgmt frame plus
120 * one CTS frame plus one ACK frame plus 3 x SIFS
121 * CTS: duration of immediately previous RTS minus time
122 * required to transmit CTS and its SIFS
123 * ACK: 0 if immediately previous directed data/mgmt had
124 * more=0, with more=1 duration in ACK frame is duration
125 * from previous frame minus time needed to transmit ACK
127 * PS Poll: BIT(15) | BIT(14) | aid
133 if (0 /* FIX: data/mgmt during CFP */)
136 if (group_addr) /* Group address as the destination - no ACK */
139 /* Individual destination address:
140 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
141 * CTS and ACK frames shall be transmitted using the highest rate in
142 * basic rate set that is less than or equal to the rate of the
143 * immediately previous frame and that is using the same modulation
144 * (CCK or OFDM). If no basic rate set matches with these requirements,
145 * the highest mandatory rate of the PHY that is less than or equal to
146 * the rate of the previous frame is used.
147 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
150 mrate = 10; /* use 1 Mbps if everything fails */
151 for (i = 0; i < mode->num_rates; i++) {
152 struct ieee80211_rate *r = &mode->rates[i];
153 if (r->rate > txrate->rate)
156 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
157 IEEE80211_RATE_MODULATION(r->flags))
160 if (r->flags & IEEE80211_RATE_BASIC)
162 else if (r->flags & IEEE80211_RATE_MANDATORY)
166 /* No matching basic rate found; use highest suitable mandatory
171 /* Time needed to transmit ACK
172 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
173 * to closest integer */
175 dur = ieee80211_frame_duration(local, 10, rate, erp,
176 tx->sdata->short_preamble);
179 /* Frame is fragmented: duration increases with time needed to
180 * transmit next fragment plus ACK and 2 x SIFS. */
181 dur *= 2; /* ACK + SIFS */
183 dur += ieee80211_frame_duration(local, next_frag_len,
185 tx->sdata->short_preamble);
191 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
194 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
197 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
200 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
203 static int inline is_ieee80211_device(struct net_device *dev,
204 struct net_device *master)
206 return (wdev_priv(dev->ieee80211_ptr) ==
207 wdev_priv(master->ieee80211_ptr));
212 static ieee80211_txrx_result
213 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
215 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
216 struct sk_buff *skb = tx->skb;
217 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
218 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
221 if (unlikely(tx->local->sta_scanning != 0) &&
222 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
223 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
226 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
227 return TXRX_CONTINUE;
229 sta_flags = tx->sta ? tx->sta->flags : 0;
231 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
232 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
233 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
234 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
236 printk(KERN_DEBUG "%s: dropped data frame to not "
237 "associated station " MAC_FMT "\n",
238 tx->dev->name, MAC_ARG(hdr->addr1));
239 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
240 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
244 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
245 tx->local->num_sta == 0 &&
246 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
248 * No associated STAs - no need to send multicast
253 return TXRX_CONTINUE;
256 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
257 !(sta_flags & WLAN_STA_AUTHORIZED))) {
258 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
259 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
260 " (unauthorized port)\n", tx->dev->name,
261 MAC_ARG(hdr->addr1));
263 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
267 return TXRX_CONTINUE;
270 static ieee80211_txrx_result
271 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
275 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
276 ieee80211_include_sequence(tx->sdata, hdr);
278 return TXRX_CONTINUE;
281 /* This function is called whenever the AP is about to exceed the maximum limit
282 * of buffered frames for power saving STAs. This situation should not really
283 * happen often during normal operation, so dropping the oldest buffered packet
284 * from each queue should be OK to make some room for new frames. */
285 static void purge_old_ps_buffers(struct ieee80211_local *local)
287 int total = 0, purged = 0;
289 struct ieee80211_sub_if_data *sdata;
290 struct sta_info *sta;
292 read_lock(&local->sub_if_lock);
293 list_for_each_entry(sdata, &local->sub_if_list, list) {
294 struct ieee80211_if_ap *ap;
295 if (sdata->dev == local->mdev ||
296 sdata->type != IEEE80211_IF_TYPE_AP)
299 skb = skb_dequeue(&ap->ps_bc_buf);
304 total += skb_queue_len(&ap->ps_bc_buf);
306 read_unlock(&local->sub_if_lock);
308 read_lock_bh(&local->sta_lock);
309 list_for_each_entry(sta, &local->sta_list, list) {
310 skb = skb_dequeue(&sta->ps_tx_buf);
315 total += skb_queue_len(&sta->ps_tx_buf);
317 read_unlock_bh(&local->sta_lock);
319 local->total_ps_buffered = total;
320 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
321 local->mdev->name, purged);
324 static inline ieee80211_txrx_result
325 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
327 /* broadcast/multicast frame */
328 /* If any of the associated stations is in power save mode,
329 * the frame is buffered to be sent after DTIM beacon frame */
330 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
331 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
332 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
333 !(tx->fc & IEEE80211_FCTL_ORDER)) {
334 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
335 purge_old_ps_buffers(tx->local);
336 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
338 if (net_ratelimit()) {
339 printk(KERN_DEBUG "%s: BC TX buffer full - "
340 "dropping the oldest frame\n",
343 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
345 tx->local->total_ps_buffered++;
346 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
350 return TXRX_CONTINUE;
353 static inline ieee80211_txrx_result
354 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
356 struct sta_info *sta = tx->sta;
359 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
360 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
361 return TXRX_CONTINUE;
363 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
364 struct ieee80211_tx_packet_data *pkt_data;
365 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
366 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
368 MAC_ARG(sta->addr), sta->aid,
369 skb_queue_len(&sta->ps_tx_buf));
370 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
371 sta->flags |= WLAN_STA_TIM;
372 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
373 purge_old_ps_buffers(tx->local);
374 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
375 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
376 if (net_ratelimit()) {
377 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
378 "buffer full - dropping oldest frame\n",
379 tx->dev->name, MAC_ARG(sta->addr));
383 tx->local->total_ps_buffered++;
384 /* Queue frame to be sent after STA sends an PS Poll frame */
385 if (skb_queue_empty(&sta->ps_tx_buf)) {
386 if (tx->local->ops->set_tim)
387 tx->local->ops->set_tim(local_to_hw(tx->local),
390 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
392 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
393 pkt_data->jiffies = jiffies;
394 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
397 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
398 else if (unlikely(sta->flags & WLAN_STA_PS)) {
399 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
400 "set -> send frame\n", tx->dev->name,
403 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
406 return TXRX_CONTINUE;
410 static ieee80211_txrx_result
411 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
413 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
414 return TXRX_CONTINUE;
416 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
417 return ieee80211_tx_h_unicast_ps_buf(tx);
419 return ieee80211_tx_h_multicast_ps_buf(tx);
425 static ieee80211_txrx_result
426 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
429 tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
431 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
433 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
435 else if (tx->sta && tx->sta->key)
436 tx->key = tx->sta->key;
437 else if (tx->sdata->default_key)
438 tx->key = tx->sdata->default_key;
439 else if (tx->sdata->drop_unencrypted &&
440 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
441 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
447 tx->key->tx_rx_count++;
448 if (unlikely(tx->local->key_tx_rx_threshold &&
449 tx->key->tx_rx_count >
450 tx->local->key_tx_rx_threshold)) {
451 ieee80211_key_threshold_notify(tx->dev, tx->key,
456 return TXRX_CONTINUE;
459 static ieee80211_txrx_result
460 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
463 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
464 struct sk_buff **frags, *first, *frag;
468 int frag_threshold = tx->local->fragmentation_threshold;
470 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
471 return TXRX_CONTINUE;
475 hdrlen = ieee80211_get_hdrlen(tx->fc);
476 payload_len = first->len - hdrlen;
477 per_fragm = frag_threshold - hdrlen - FCS_LEN;
478 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
480 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
484 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
485 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
486 pos = first->data + hdrlen + per_fragm;
487 left = payload_len - per_fragm;
488 for (i = 0; i < num_fragm - 1; i++) {
489 struct ieee80211_hdr *fhdr;
495 /* reserve enough extra head and tail room for possible
498 dev_alloc_skb(tx->local->tx_headroom +
500 IEEE80211_ENCRYPT_HEADROOM +
501 IEEE80211_ENCRYPT_TAILROOM);
504 /* Make sure that all fragments use the same priority so
505 * that they end up using the same TX queue */
506 frag->priority = first->priority;
507 skb_reserve(frag, tx->local->tx_headroom +
508 IEEE80211_ENCRYPT_HEADROOM);
509 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
510 memcpy(fhdr, first->data, hdrlen);
511 if (i == num_fragm - 2)
512 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
513 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
514 copylen = left > per_fragm ? per_fragm : left;
515 memcpy(skb_put(frag, copylen), pos, copylen);
520 skb_trim(first, hdrlen + per_fragm);
522 tx->u.tx.num_extra_frag = num_fragm - 1;
523 tx->u.tx.extra_frag = frags;
525 return TXRX_CONTINUE;
528 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
530 for (i = 0; i < num_fragm - 1; i++)
532 dev_kfree_skb(frags[i]);
535 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
539 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
541 if (tx->key->force_sw_encrypt) {
542 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
545 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
546 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
547 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
555 static ieee80211_txrx_result
556 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
558 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
561 fc = le16_to_cpu(hdr->frame_control);
563 if (!tx->key || tx->key->alg != ALG_WEP ||
564 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
565 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
566 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
567 return TXRX_CONTINUE;
569 tx->u.tx.control->iv_len = WEP_IV_LEN;
570 tx->u.tx.control->icv_len = WEP_ICV_LEN;
571 ieee80211_tx_set_iswep(tx);
573 if (wep_encrypt_skb(tx, tx->skb) < 0) {
574 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
578 if (tx->u.tx.extra_frag) {
580 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
581 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
582 I802_DEBUG_INC(tx->local->
583 tx_handlers_drop_wep);
589 return TXRX_CONTINUE;
592 static ieee80211_txrx_result
593 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
595 struct rate_control_extra extra;
597 memset(&extra, 0, sizeof(extra));
598 extra.mode = tx->u.tx.mode;
599 extra.mgmt_data = tx->sdata &&
600 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
601 extra.ethertype = tx->ethertype;
603 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
605 if (unlikely(extra.probe != NULL)) {
606 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
607 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
608 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
609 tx->u.tx.rate = extra.probe;
611 tx->u.tx.control->alt_retry_rate = -1;
615 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
616 tx->sdata->use_protection &&
617 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
618 tx->u.tx.last_frag_rate = tx->u.tx.rate;
620 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
622 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
623 tx->u.tx.rate = extra.nonerp;
624 tx->u.tx.control->rate = extra.nonerp;
625 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
627 tx->u.tx.last_frag_rate = tx->u.tx.rate;
628 tx->u.tx.control->rate = tx->u.tx.rate;
630 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
632 return TXRX_CONTINUE;
635 static ieee80211_txrx_result
636 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
638 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
639 u16 fc = le16_to_cpu(hdr->frame_control);
641 struct ieee80211_tx_control *control = tx->u.tx.control;
642 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
644 if (!is_multicast_ether_addr(hdr->addr1)) {
645 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
646 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
647 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
648 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
649 control->retry_limit =
650 tx->local->long_retry_limit;
652 control->retry_limit =
653 tx->local->short_retry_limit;
656 control->retry_limit = 1;
659 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
660 /* Do not use multiple retry rates when sending fragmented
662 * TODO: The last fragment could still use multiple retry
664 control->alt_retry_rate = -1;
667 /* Use CTS protection for unicast frames sent using extended rates if
668 * there are associated non-ERP stations and RTS/CTS is not configured
670 if (mode->mode == MODE_IEEE80211G &&
671 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
672 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
673 tx->sdata->use_protection &&
674 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
675 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
677 /* Transmit data frames using short preambles if the driver supports
678 * short preambles at the selected rate and short preambles are
679 * available on the network at the current point in time. */
680 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
681 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
682 tx->sdata->short_preamble &&
683 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
684 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
687 /* Setup duration field for the first fragment of the frame. Duration
688 * for remaining fragments will be updated when they are being sent
689 * to low-level driver in ieee80211_tx(). */
690 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
691 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
692 tx->u.tx.extra_frag[0]->len : 0);
693 hdr->duration_id = cpu_to_le16(dur);
695 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
696 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
697 struct ieee80211_rate *rate;
699 /* Do not use multiple retry rates when using RTS/CTS */
700 control->alt_retry_rate = -1;
702 /* Use min(data rate, max base rate) as CTS/RTS rate */
703 rate = tx->u.tx.rate;
704 while (rate > mode->rates &&
705 !(rate->flags & IEEE80211_RATE_BASIC))
708 control->rts_cts_rate = rate->val;
709 control->rts_rate = rate;
713 tx->sta->tx_packets++;
714 tx->sta->tx_fragments++;
715 tx->sta->tx_bytes += tx->skb->len;
716 if (tx->u.tx.extra_frag) {
718 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
719 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
721 tx->u.tx.extra_frag[i]->len;
726 return TXRX_CONTINUE;
729 static ieee80211_txrx_result
730 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
732 struct ieee80211_local *local = tx->local;
733 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
734 struct sk_buff *skb = tx->skb;
735 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
736 u32 load = 0, hdrtime;
738 /* TODO: this could be part of tx_status handling, so that the number
739 * of retries would be known; TX rate should in that case be stored
740 * somewhere with the packet */
742 /* Estimate total channel use caused by this frame */
744 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
745 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
747 if (mode->mode == MODE_IEEE80211A ||
748 mode->mode == MODE_ATHEROS_TURBO ||
749 mode->mode == MODE_ATHEROS_TURBOG ||
750 (mode->mode == MODE_IEEE80211G &&
751 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
752 hdrtime = CHAN_UTIL_HDR_SHORT;
754 hdrtime = CHAN_UTIL_HDR_LONG;
757 if (!is_multicast_ether_addr(hdr->addr1))
760 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
762 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
765 load += skb->len * tx->u.tx.rate->rate_inv;
767 if (tx->u.tx.extra_frag) {
769 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
771 load += tx->u.tx.extra_frag[i]->len *
776 /* Divide channel_use by 8 to avoid wrapping around the counter */
777 load >>= CHAN_UTIL_SHIFT;
778 local->channel_use_raw += load;
780 tx->sta->channel_use_raw += load;
781 tx->sdata->channel_use_raw += load;
783 return TXRX_CONTINUE;
786 /* TODO: implement register/unregister functions for adding TX/RX handlers
787 * into ordered list */
789 ieee80211_tx_handler ieee80211_tx_handlers[] =
791 ieee80211_tx_h_check_assoc,
792 ieee80211_tx_h_sequence,
793 ieee80211_tx_h_ps_buf,
794 ieee80211_tx_h_select_key,
795 ieee80211_tx_h_michael_mic_add,
796 ieee80211_tx_h_fragment,
797 ieee80211_tx_h_tkip_encrypt,
798 ieee80211_tx_h_ccmp_encrypt,
799 ieee80211_tx_h_wep_encrypt,
800 ieee80211_tx_h_rate_ctrl,
802 ieee80211_tx_h_load_stats,
806 /* actual transmit path */
809 * deal with packet injection down monitor interface
810 * with Radiotap Header -- only called for monitor mode interface
812 static ieee80211_txrx_result
813 __ieee80211_parse_tx_radiotap(
814 struct ieee80211_txrx_data *tx,
815 struct sk_buff *skb, struct ieee80211_tx_control *control)
818 * this is the moment to interpret and discard the radiotap header that
819 * must be at the start of the packet injected in Monitor mode
821 * Need to take some care with endian-ness since radiotap
822 * args are little-endian
825 struct ieee80211_radiotap_iterator iterator;
826 struct ieee80211_radiotap_header *rthdr =
827 (struct ieee80211_radiotap_header *) skb->data;
828 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
829 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
832 * default control situation for all injected packets
833 * FIXME: this does not suit all usage cases, expand to allow control
836 control->retry_limit = 1; /* no retry */
837 control->key_idx = -1; /* no encryption key */
838 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
839 IEEE80211_TXCTL_USE_CTS_PROTECT);
840 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
841 IEEE80211_TXCTL_NO_ACK;
842 control->antenna_sel_tx = 0; /* default to default antenna */
845 * for every radiotap entry that is present
846 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
847 * entries present, or -EINVAL on error)
853 ret = ieee80211_radiotap_iterator_next(&iterator);
858 /* see if this argument is something we can use */
859 switch (iterator.this_arg_index) {
861 * You must take care when dereferencing iterator.this_arg
862 * for multibyte types... the pointer is not aligned. Use
863 * get_unaligned((type *)iterator.this_arg) to dereference
864 * iterator.this_arg for type "type" safely on all arches.
866 case IEEE80211_RADIOTAP_RATE:
868 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
869 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
871 target_rate = (*iterator.this_arg) * 5;
872 for (i = 0; i < mode->num_rates; i++) {
873 struct ieee80211_rate *r = &mode->rates[i];
875 if (r->rate > target_rate)
880 if (r->flags & IEEE80211_RATE_PREAMBLE2)
881 control->tx_rate = r->val2;
883 control->tx_rate = r->val;
885 /* end on exact match */
886 if (r->rate == target_rate)
891 case IEEE80211_RADIOTAP_ANTENNA:
893 * radiotap uses 0 for 1st ant, mac80211 is 1 for
896 control->antenna_sel_tx = (*iterator.this_arg) + 1;
899 case IEEE80211_RADIOTAP_DBM_TX_POWER:
900 control->power_level = *iterator.this_arg;
903 case IEEE80211_RADIOTAP_FLAGS:
904 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
906 * this indicates that the skb we have been
907 * handed has the 32-bit FCS CRC at the end...
908 * we should react to that by snipping it off
909 * because it will be recomputed and added
912 if (skb->len < (iterator.max_length + FCS_LEN))
915 skb_trim(skb, skb->len - FCS_LEN);
924 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
928 * remove the radiotap header
929 * iterator->max_length was sanity-checked against
930 * skb->len by iterator init
932 skb_pull(skb, iterator.max_length);
934 return TXRX_CONTINUE;
937 static ieee80211_txrx_result inline
938 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
940 struct net_device *dev,
941 struct ieee80211_tx_control *control)
943 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
944 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
945 struct ieee80211_sub_if_data *sdata;
946 ieee80211_txrx_result res = TXRX_CONTINUE;
950 memset(tx, 0, sizeof(*tx));
952 tx->dev = dev; /* use original interface */
954 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
955 tx->sta = sta_info_get(local, hdr->addr1);
956 tx->fc = le16_to_cpu(hdr->frame_control);
959 * set defaults for things that can be set by
960 * injected radiotap headers
962 control->power_level = local->hw.conf.power_level;
963 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
965 /* process and remove the injection radiotap header */
966 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
967 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
968 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
973 * we removed the radiotap header after this point,
974 * we filled control with what we could use
975 * set to the actual ieee header now
977 hdr = (struct ieee80211_hdr *) skb->data;
978 res = TXRX_QUEUED; /* indication it was monitor packet */
981 tx->u.tx.control = control;
982 if (is_multicast_ether_addr(hdr->addr1)) {
983 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
984 control->flags |= IEEE80211_TXCTL_NO_ACK;
986 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
987 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
989 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
990 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
991 skb->len + FCS_LEN > local->fragmentation_threshold &&
992 !local->ops->set_frag_threshold)
993 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
995 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
997 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
998 else if (tx->sta->clear_dst_mask) {
999 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1000 tx->sta->clear_dst_mask = 0;
1002 hdrlen = ieee80211_get_hdrlen(tx->fc);
1003 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1004 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1005 tx->ethertype = (pos[0] << 8) | pos[1];
1007 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1012 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1013 * finished with it. */
1014 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1015 struct sk_buff *skb,
1016 struct net_device *mdev,
1017 struct ieee80211_tx_control *control)
1019 struct ieee80211_tx_packet_data *pkt_data;
1020 struct net_device *dev;
1022 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1023 dev = dev_get_by_index(pkt_data->ifindex);
1024 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1030 __ieee80211_tx_prepare(tx, skb, dev, control);
1034 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1035 struct ieee80211_txrx_data *tx)
1037 struct ieee80211_tx_control *control = tx->u.tx.control;
1040 if (!ieee80211_qdisc_installed(local->mdev) &&
1041 __ieee80211_queue_stopped(local, 0)) {
1042 netif_stop_queue(local->mdev);
1043 return IEEE80211_TX_AGAIN;
1046 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1047 ret = local->ops->tx(local_to_hw(local), skb, control);
1049 return IEEE80211_TX_AGAIN;
1050 local->mdev->trans_start = jiffies;
1051 ieee80211_led_tx(local, 1);
1053 if (tx->u.tx.extra_frag) {
1054 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1055 IEEE80211_TXCTL_USE_CTS_PROTECT |
1056 IEEE80211_TXCTL_CLEAR_DST_MASK |
1057 IEEE80211_TXCTL_FIRST_FRAGMENT);
1058 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1059 if (!tx->u.tx.extra_frag[i])
1061 if (__ieee80211_queue_stopped(local, control->queue))
1062 return IEEE80211_TX_FRAG_AGAIN;
1063 if (i == tx->u.tx.num_extra_frag) {
1064 control->tx_rate = tx->u.tx.last_frag_hwrate;
1065 control->rate = tx->u.tx.last_frag_rate;
1066 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1068 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1071 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1074 ieee80211_dump_frame(local->mdev->name,
1075 "TX to low-level driver",
1076 tx->u.tx.extra_frag[i]);
1077 ret = local->ops->tx(local_to_hw(local),
1078 tx->u.tx.extra_frag[i],
1081 return IEEE80211_TX_FRAG_AGAIN;
1082 local->mdev->trans_start = jiffies;
1083 ieee80211_led_tx(local, 1);
1084 tx->u.tx.extra_frag[i] = NULL;
1086 kfree(tx->u.tx.extra_frag);
1087 tx->u.tx.extra_frag = NULL;
1089 return IEEE80211_TX_OK;
1092 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1093 struct ieee80211_tx_control *control, int mgmt)
1095 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1096 struct sta_info *sta;
1097 ieee80211_tx_handler *handler;
1098 struct ieee80211_txrx_data tx;
1099 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1102 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1104 if (unlikely(skb->len < 10)) {
1109 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1111 if (res_prepare == TXRX_DROP) {
1117 tx.u.tx.mgmt_interface = mgmt;
1118 tx.u.tx.mode = local->hw.conf.mode;
1120 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1121 res = TXRX_CONTINUE;
1123 for (handler = local->tx_handlers; *handler != NULL;
1125 res = (*handler)(&tx);
1126 if (res != TXRX_CONTINUE)
1131 skb = tx.skb; /* handlers are allowed to change skb */
1136 if (unlikely(res == TXRX_DROP)) {
1137 I802_DEBUG_INC(local->tx_handlers_drop);
1141 if (unlikely(res == TXRX_QUEUED)) {
1142 I802_DEBUG_INC(local->tx_handlers_queued);
1146 if (tx.u.tx.extra_frag) {
1147 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1149 struct ieee80211_hdr *hdr =
1150 (struct ieee80211_hdr *)
1151 tx.u.tx.extra_frag[i]->data;
1153 if (i + 1 < tx.u.tx.num_extra_frag) {
1154 next_len = tx.u.tx.extra_frag[i + 1]->len;
1157 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1158 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1160 dur = ieee80211_duration(&tx, 0, next_len);
1161 hdr->duration_id = cpu_to_le16(dur);
1166 ret = __ieee80211_tx(local, skb, &tx);
1168 struct ieee80211_tx_stored_packet *store =
1169 &local->pending_packet[control->queue];
1171 if (ret == IEEE80211_TX_FRAG_AGAIN)
1173 set_bit(IEEE80211_LINK_STATE_PENDING,
1174 &local->state[control->queue]);
1176 /* When the driver gets out of buffers during sending of
1177 * fragments and calls ieee80211_stop_queue, there is
1178 * a small window between IEEE80211_LINK_STATE_XOFF and
1179 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1180 * gets available in that window (i.e. driver calls
1181 * ieee80211_wake_queue), we would end up with ieee80211_tx
1182 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1183 * continuing transmitting here when that situation is
1184 * possible to have happened. */
1185 if (!__ieee80211_queue_stopped(local, control->queue)) {
1186 clear_bit(IEEE80211_LINK_STATE_PENDING,
1187 &local->state[control->queue]);
1190 memcpy(&store->control, control,
1191 sizeof(struct ieee80211_tx_control));
1193 store->extra_frag = tx.u.tx.extra_frag;
1194 store->num_extra_frag = tx.u.tx.num_extra_frag;
1195 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1196 store->last_frag_rate = tx.u.tx.last_frag_rate;
1197 store->last_frag_rate_ctrl_probe =
1198 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1205 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1206 if (tx.u.tx.extra_frag[i])
1207 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1208 kfree(tx.u.tx.extra_frag);
1212 /* device xmit handlers */
1214 int ieee80211_master_start_xmit(struct sk_buff *skb,
1215 struct net_device *dev)
1217 struct ieee80211_tx_control control;
1218 struct ieee80211_tx_packet_data *pkt_data;
1219 struct net_device *odev = NULL;
1220 struct ieee80211_sub_if_data *osdata;
1225 * copy control out of the skb so other people can use skb->cb
1227 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1228 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1230 if (pkt_data->ifindex)
1231 odev = dev_get_by_index(pkt_data->ifindex);
1232 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1236 if (unlikely(!odev)) {
1237 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1238 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1239 "originating device\n", dev->name);
1244 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1246 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1247 if (skb_headroom(skb) < headroom) {
1248 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1255 control.ifindex = odev->ifindex;
1256 control.type = osdata->type;
1257 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1258 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1259 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1260 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1261 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1262 control.flags |= IEEE80211_TXCTL_REQUEUE;
1263 control.queue = pkt_data->queue;
1265 ret = ieee80211_tx(odev, skb, &control,
1266 control.type == IEEE80211_IF_TYPE_MGMT);
1272 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1273 struct net_device *dev)
1275 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1276 struct ieee80211_tx_packet_data *pkt_data;
1277 struct ieee80211_radiotap_header *prthdr =
1278 (struct ieee80211_radiotap_header *)skb->data;
1281 /* check for not even having the fixed radiotap header part */
1282 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1283 goto fail; /* too short to be possibly valid */
1285 /* is it a header version we can trust to find length from? */
1286 if (unlikely(prthdr->it_version))
1287 goto fail; /* only version 0 is supported */
1289 /* then there must be a radiotap header with a length we can use */
1290 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1292 /* does the skb contain enough to deliver on the alleged length? */
1293 if (unlikely(skb->len < len_rthdr))
1294 goto fail; /* skb too short for claimed rt header extent */
1296 skb->dev = local->mdev;
1298 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1299 memset(pkt_data, 0, sizeof(*pkt_data));
1300 /* needed because we set skb device to master */
1301 pkt_data->ifindex = dev->ifindex;
1303 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1306 * fix up the pointers accounting for the radiotap
1307 * header still being in there. We are being given
1308 * a precooked IEEE80211 header so no need for
1311 skb_set_mac_header(skb, len_rthdr);
1313 * these are just fixed to the end of the rt area since we
1314 * don't have any better information and at this point, nobody cares
1316 skb_set_network_header(skb, len_rthdr);
1317 skb_set_transport_header(skb, len_rthdr);
1319 /* pass the radiotap header up to the next stage intact */
1320 dev_queue_xmit(skb);
1321 return NETDEV_TX_OK;
1325 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1329 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1330 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1331 * @skb: packet to be sent
1332 * @dev: incoming interface
1334 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1335 * not be freed, and caller is responsible for either retrying later or freeing
1338 * This function takes in an Ethernet header and encapsulates it with suitable
1339 * IEEE 802.11 header based on which interface the packet is coming in. The
1340 * encapsulated packet will then be passed to master interface, wlan#.11, for
1341 * transmission (through low-level driver).
1343 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1344 struct net_device *dev)
1346 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1347 struct ieee80211_tx_packet_data *pkt_data;
1348 struct ieee80211_sub_if_data *sdata;
1349 int ret = 1, head_need;
1350 u16 ethertype, hdrlen, fc;
1351 struct ieee80211_hdr hdr;
1352 const u8 *encaps_data;
1353 int encaps_len, skip_header_bytes;
1355 struct sta_info *sta;
1357 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1358 if (unlikely(skb->len < ETH_HLEN)) {
1359 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1360 dev->name, skb->len);
1365 nh_pos = skb_network_header(skb) - skb->data;
1366 h_pos = skb_transport_header(skb) - skb->data;
1368 /* convert Ethernet header to proper 802.11 header (based on
1369 * operation mode) */
1370 ethertype = (skb->data[12] << 8) | skb->data[13];
1371 /* TODO: handling for 802.1x authorized/unauthorized port */
1372 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1374 switch (sdata->type) {
1375 case IEEE80211_IF_TYPE_AP:
1376 case IEEE80211_IF_TYPE_VLAN:
1377 fc |= IEEE80211_FCTL_FROMDS;
1379 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1380 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1381 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1384 case IEEE80211_IF_TYPE_WDS:
1385 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1387 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1388 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1389 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1390 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1393 case IEEE80211_IF_TYPE_STA:
1394 fc |= IEEE80211_FCTL_TODS;
1396 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1397 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1398 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1401 case IEEE80211_IF_TYPE_IBSS:
1403 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1404 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1405 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1413 /* receiver is QoS enabled, use a QoS type frame */
1414 sta = sta_info_get(local, hdr.addr1);
1416 if (sta->flags & WLAN_STA_WME) {
1417 fc |= IEEE80211_STYPE_QOS_DATA;
1423 hdr.frame_control = cpu_to_le16(fc);
1424 hdr.duration_id = 0;
1427 skip_header_bytes = ETH_HLEN;
1428 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1429 encaps_data = bridge_tunnel_header;
1430 encaps_len = sizeof(bridge_tunnel_header);
1431 skip_header_bytes -= 2;
1432 } else if (ethertype >= 0x600) {
1433 encaps_data = rfc1042_header;
1434 encaps_len = sizeof(rfc1042_header);
1435 skip_header_bytes -= 2;
1441 skb_pull(skb, skip_header_bytes);
1442 nh_pos -= skip_header_bytes;
1443 h_pos -= skip_header_bytes;
1445 /* TODO: implement support for fragments so that there is no need to
1446 * reallocate and copy payload; it might be enough to support one
1447 * extra fragment that would be copied in the beginning of the frame
1448 * data.. anyway, it would be nice to include this into skb structure
1451 * There are few options for this:
1452 * use skb->cb as an extra space for 802.11 header
1453 * allocate new buffer if not enough headroom
1454 * make sure that there is enough headroom in every skb by increasing
1455 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1456 * alloc_skb() (net/core/skbuff.c)
1458 head_need = hdrlen + encaps_len + local->tx_headroom;
1459 head_need -= skb_headroom(skb);
1461 /* We are going to modify skb data, so make a copy of it if happens to
1462 * be cloned. This could happen, e.g., with Linux bridge code passing
1463 * us broadcast frames. */
1465 if (head_need > 0 || skb_cloned(skb)) {
1467 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1468 "of headroom\n", dev->name, head_need);
1471 if (skb_cloned(skb))
1472 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1474 I802_DEBUG_INC(local->tx_expand_skb_head);
1475 /* Since we have to reallocate the buffer, make sure that there
1476 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1477 * before payload and 12 after). */
1478 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1480 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1487 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1488 nh_pos += encaps_len;
1489 h_pos += encaps_len;
1491 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1495 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1496 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1497 pkt_data->ifindex = dev->ifindex;
1498 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1499 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1501 skb->dev = local->mdev;
1502 sdata->stats.tx_packets++;
1503 sdata->stats.tx_bytes += skb->len;
1505 /* Update skb pointers to various headers since this modified frame
1506 * is going to go through Linux networking code that may potentially
1507 * need things like pointer to IP header. */
1508 skb_set_mac_header(skb, 0);
1509 skb_set_network_header(skb, nh_pos);
1510 skb_set_transport_header(skb, h_pos);
1512 dev->trans_start = jiffies;
1513 dev_queue_xmit(skb);
1525 * This is the transmit routine for the 802.11 type interfaces
1526 * called by upper layers of the linux networking
1527 * stack when it has a frame to transmit
1529 int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1531 struct ieee80211_sub_if_data *sdata;
1532 struct ieee80211_tx_packet_data *pkt_data;
1533 struct ieee80211_hdr *hdr;
1536 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1538 if (skb->len < 10) {
1543 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1544 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1551 hdr = (struct ieee80211_hdr *) skb->data;
1552 fc = le16_to_cpu(hdr->frame_control);
1554 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1555 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1556 pkt_data->ifindex = sdata->dev->ifindex;
1557 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1558 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
1560 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1561 skb->dev = sdata->local->mdev;
1564 * We're using the protocol field of the the frame control header
1565 * to request TX callback for hostapd. BIT(1) is checked.
1567 if ((fc & BIT(1)) == BIT(1)) {
1568 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1570 hdr->frame_control = cpu_to_le16(fc);
1573 if (!(fc & IEEE80211_FCTL_PROTECTED))
1574 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1576 sdata->stats.tx_packets++;
1577 sdata->stats.tx_bytes += skb->len;
1579 dev_queue_xmit(skb);
1584 /* helper functions for pending packets for when queues are stopped */
1586 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1589 struct ieee80211_tx_stored_packet *store;
1591 for (i = 0; i < local->hw.queues; i++) {
1592 if (!__ieee80211_queue_pending(local, i))
1594 store = &local->pending_packet[i];
1595 kfree_skb(store->skb);
1596 for (j = 0; j < store->num_extra_frag; j++)
1597 kfree_skb(store->extra_frag[j]);
1598 kfree(store->extra_frag);
1599 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1603 void ieee80211_tx_pending(unsigned long data)
1605 struct ieee80211_local *local = (struct ieee80211_local *)data;
1606 struct net_device *dev = local->mdev;
1607 struct ieee80211_tx_stored_packet *store;
1608 struct ieee80211_txrx_data tx;
1609 int i, ret, reschedule = 0;
1611 netif_tx_lock_bh(dev);
1612 for (i = 0; i < local->hw.queues; i++) {
1613 if (__ieee80211_queue_stopped(local, i))
1615 if (!__ieee80211_queue_pending(local, i)) {
1619 store = &local->pending_packet[i];
1620 tx.u.tx.control = &store->control;
1621 tx.u.tx.extra_frag = store->extra_frag;
1622 tx.u.tx.num_extra_frag = store->num_extra_frag;
1623 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1624 tx.u.tx.last_frag_rate = store->last_frag_rate;
1626 if (store->last_frag_rate_ctrl_probe)
1627 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1628 ret = __ieee80211_tx(local, store->skb, &tx);
1630 if (ret == IEEE80211_TX_FRAG_AGAIN)
1633 clear_bit(IEEE80211_LINK_STATE_PENDING,
1638 netif_tx_unlock_bh(dev);
1640 if (!ieee80211_qdisc_installed(dev)) {
1641 if (!__ieee80211_queue_stopped(local, 0))
1642 netif_wake_queue(dev);
1644 netif_schedule(dev);
1648 /* functions for drivers to get certain frames */
1650 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1651 struct ieee80211_if_ap *bss,
1652 struct sk_buff *skb)
1656 int i, have_bits = 0, n1, n2;
1658 /* Generate bitmap for TIM only if there are any STAs in power save
1660 read_lock_bh(&local->sta_lock);
1661 if (atomic_read(&bss->num_sta_ps) > 0)
1662 /* in the hope that this is faster than
1663 * checking byte-for-byte */
1664 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1665 IEEE80211_MAX_AID+1);
1667 if (bss->dtim_count == 0)
1668 bss->dtim_count = bss->dtim_period - 1;
1672 tim = pos = (u8 *) skb_put(skb, 6);
1673 *pos++ = WLAN_EID_TIM;
1675 *pos++ = bss->dtim_count;
1676 *pos++ = bss->dtim_period;
1678 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1682 /* Find largest even number N1 so that bits numbered 1 through
1683 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1684 * (N2 + 1) x 8 through 2007 are 0. */
1686 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1693 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1700 /* Bitmap control */
1702 /* Part Virt Bitmap */
1703 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1705 tim[1] = n2 - n1 + 4;
1706 skb_put(skb, n2 - n1);
1708 *pos++ = aid0; /* Bitmap control */
1709 *pos++ = 0; /* Part Virt Bitmap */
1711 read_unlock_bh(&local->sta_lock);
1714 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1715 struct ieee80211_tx_control *control)
1717 struct ieee80211_local *local = hw_to_local(hw);
1718 struct sk_buff *skb;
1719 struct net_device *bdev;
1720 struct ieee80211_sub_if_data *sdata = NULL;
1721 struct ieee80211_if_ap *ap = NULL;
1722 struct ieee80211_rate *rate;
1723 struct rate_control_extra extra;
1724 u8 *b_head, *b_tail;
1727 bdev = dev_get_by_index(if_id);
1729 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1734 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1736 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1737 if (net_ratelimit())
1738 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1739 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1740 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1744 /* Assume we are generating the normal beacon locally */
1745 b_head = ap->beacon_head;
1746 b_tail = ap->beacon_tail;
1747 bh_len = ap->beacon_head_len;
1748 bt_len = ap->beacon_tail_len;
1750 skb = dev_alloc_skb(local->tx_headroom +
1751 bh_len + bt_len + 256 /* maximum TIM len */);
1755 skb_reserve(skb, local->tx_headroom);
1756 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1758 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1760 ieee80211_beacon_add_tim(local, ap, skb);
1763 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1767 memset(&extra, 0, sizeof(extra));
1768 extra.mode = local->oper_hw_mode;
1770 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1772 if (net_ratelimit()) {
1773 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1774 "found\n", local->mdev->name);
1780 control->tx_rate = (sdata->short_preamble &&
1781 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1782 rate->val2 : rate->val;
1783 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1784 control->power_level = local->hw.conf.power_level;
1785 control->flags |= IEEE80211_TXCTL_NO_ACK;
1786 control->retry_limit = 1;
1787 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1793 EXPORT_SYMBOL(ieee80211_beacon_get);
1795 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1796 const void *frame, size_t frame_len,
1797 const struct ieee80211_tx_control *frame_txctl,
1798 struct ieee80211_rts *rts)
1800 const struct ieee80211_hdr *hdr = frame;
1803 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1804 rts->frame_control = cpu_to_le16(fctl);
1805 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1806 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1807 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1809 EXPORT_SYMBOL(ieee80211_rts_get);
1811 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1812 const void *frame, size_t frame_len,
1813 const struct ieee80211_tx_control *frame_txctl,
1814 struct ieee80211_cts *cts)
1816 const struct ieee80211_hdr *hdr = frame;
1819 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1820 cts->frame_control = cpu_to_le16(fctl);
1821 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1822 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1824 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1827 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1828 struct ieee80211_tx_control *control)
1830 struct ieee80211_local *local = hw_to_local(hw);
1831 struct sk_buff *skb;
1832 struct sta_info *sta;
1833 ieee80211_tx_handler *handler;
1834 struct ieee80211_txrx_data tx;
1835 ieee80211_txrx_result res = TXRX_DROP;
1836 struct net_device *bdev;
1837 struct ieee80211_sub_if_data *sdata;
1838 struct ieee80211_if_ap *bss = NULL;
1840 bdev = dev_get_by_index(if_id);
1842 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1846 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1849 if (bss->dtim_count != 0)
1850 return NULL; /* send buffered bc/mc only after DTIM beacon */
1851 memset(control, 0, sizeof(*control));
1853 skb = skb_dequeue(&bss->ps_bc_buf);
1856 local->total_ps_buffered--;
1858 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1859 struct ieee80211_hdr *hdr =
1860 (struct ieee80211_hdr *) skb->data;
1861 /* more buffered multicast/broadcast frames ==> set
1862 * MoreData flag in IEEE 802.11 header to inform PS
1864 hdr->frame_control |=
1865 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1868 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1870 dev_kfree_skb_any(skb);
1873 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1875 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1876 res = (*handler)(&tx);
1877 if (res == TXRX_DROP || res == TXRX_QUEUED)
1881 skb = tx.skb; /* handlers are allowed to change skb */
1883 if (res == TXRX_DROP) {
1884 I802_DEBUG_INC(local->tx_handlers_drop);
1887 } else if (res == TXRX_QUEUED) {
1888 I802_DEBUG_INC(local->tx_handlers_queued);
1897 EXPORT_SYMBOL(ieee80211_get_buffered_bc);