2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "ieee80211_led.h"
32 #include "ieee80211_rate.h"
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_hdr *hdr)
43 /* Set the sequence number for this frame. */
44 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
46 /* Increase the sequence number. */
47 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname, const char *title,
52 const struct sk_buff *skb)
54 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
59 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
65 fc = le16_to_cpu(hdr->frame_control);
66 hdrlen = ieee80211_get_hdrlen(fc);
67 if (hdrlen > skb->len)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc, le16_to_cpu(hdr->duration_id));
73 printk(" A1=%s", print_mac(mac, hdr->addr1));
75 printk(" A2=%s", print_mac(mac, hdr->addr2));
77 printk(" A3=%s", print_mac(mac, hdr->addr3));
79 printk(" A4=%s", print_mac(mac, hdr->addr4));
82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
89 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
92 int rate, mrate, erp, dur, i;
93 struct ieee80211_rate *txrate = tx->u.tx.rate;
94 struct ieee80211_local *local = tx->local;
95 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
97 erp = txrate->flags & IEEE80211_RATE_ERP;
100 * data and mgmt (except PS Poll):
101 * - during CFP: 32768
102 * - during contention period:
103 * if addr1 is group address: 0
104 * if more fragments = 0 and addr1 is individual address: time to
105 * transmit one ACK plus SIFS
106 * if more fragments = 1 and addr1 is individual address: time to
107 * transmit next fragment plus 2 x ACK plus 3 x SIFS
110 * - control response frame (CTS or ACK) shall be transmitted using the
111 * same rate as the immediately previous frame in the frame exchange
112 * sequence, if this rate belongs to the PHY mandatory rates, or else
113 * at the highest possible rate belonging to the PHY rates in the
117 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
118 /* TODO: These control frames are not currently sent by
119 * 80211.o, but should they be implemented, this function
120 * needs to be updated to support duration field calculation.
122 * RTS: time needed to transmit pending data/mgmt frame plus
123 * one CTS frame plus one ACK frame plus 3 x SIFS
124 * CTS: duration of immediately previous RTS minus time
125 * required to transmit CTS and its SIFS
126 * ACK: 0 if immediately previous directed data/mgmt had
127 * more=0, with more=1 duration in ACK frame is duration
128 * from previous frame minus time needed to transmit ACK
130 * PS Poll: BIT(15) | BIT(14) | aid
136 if (0 /* FIX: data/mgmt during CFP */)
139 if (group_addr) /* Group address as the destination - no ACK */
142 /* Individual destination address:
143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
144 * CTS and ACK frames shall be transmitted using the highest rate in
145 * basic rate set that is less than or equal to the rate of the
146 * immediately previous frame and that is using the same modulation
147 * (CCK or OFDM). If no basic rate set matches with these requirements,
148 * the highest mandatory rate of the PHY that is less than or equal to
149 * the rate of the previous frame is used.
150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
153 mrate = 10; /* use 1 Mbps if everything fails */
154 for (i = 0; i < mode->num_rates; i++) {
155 struct ieee80211_rate *r = &mode->rates[i];
156 if (r->rate > txrate->rate)
159 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
160 IEEE80211_RATE_MODULATION(r->flags))
163 if (r->flags & IEEE80211_RATE_BASIC)
165 else if (r->flags & IEEE80211_RATE_MANDATORY)
169 /* No matching basic rate found; use highest suitable mandatory
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
178 dur = ieee80211_frame_duration(local, 10, rate, erp,
179 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
186 dur += ieee80211_frame_duration(local, next_frag_len,
189 IEEE80211_SDATA_SHORT_PREAMBLE);
195 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
198 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
201 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
204 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
207 static int inline is_ieee80211_device(struct net_device *dev,
208 struct net_device *master)
210 return (wdev_priv(dev->ieee80211_ptr) ==
211 wdev_priv(master->ieee80211_ptr));
216 static ieee80211_txrx_result
217 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
219 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
220 struct sk_buff *skb = tx->skb;
221 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
222 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
225 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
226 return TXRX_CONTINUE;
228 if (unlikely(tx->local->sta_sw_scanning) &&
229 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
230 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
233 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
234 return TXRX_CONTINUE;
236 sta_flags = tx->sta ? tx->sta->flags : 0;
238 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
239 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
240 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
241 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
242 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
243 DECLARE_MAC_BUF(mac);
244 printk(KERN_DEBUG "%s: dropped data frame to not "
245 "associated station %s\n",
246 tx->dev->name, print_mac(mac, hdr->addr1));
247 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
248 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
252 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
253 tx->local->num_sta == 0 &&
254 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
256 * No associated STAs - no need to send multicast
261 return TXRX_CONTINUE;
264 return TXRX_CONTINUE;
267 static ieee80211_txrx_result
268 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
272 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
273 ieee80211_include_sequence(tx->sdata, hdr);
275 return TXRX_CONTINUE;
278 /* This function is called whenever the AP is about to exceed the maximum limit
279 * of buffered frames for power saving STAs. This situation should not really
280 * happen often during normal operation, so dropping the oldest buffered packet
281 * from each queue should be OK to make some room for new frames. */
282 static void purge_old_ps_buffers(struct ieee80211_local *local)
284 int total = 0, purged = 0;
286 struct ieee80211_sub_if_data *sdata;
287 struct sta_info *sta;
290 * virtual interfaces are protected by RCU
294 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
295 struct ieee80211_if_ap *ap;
296 if (sdata->dev == local->mdev ||
297 sdata->type != IEEE80211_IF_TYPE_AP)
300 skb = skb_dequeue(&ap->ps_bc_buf);
305 total += skb_queue_len(&ap->ps_bc_buf);
309 read_lock_bh(&local->sta_lock);
310 list_for_each_entry(sta, &local->sta_list, list) {
311 skb = skb_dequeue(&sta->ps_tx_buf);
316 total += skb_queue_len(&sta->ps_tx_buf);
318 read_unlock_bh(&local->sta_lock);
320 local->total_ps_buffered = total;
321 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
322 wiphy_name(local->hw.wiphy), purged);
325 static ieee80211_txrx_result
326 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
329 * 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 * This is done either by the hardware or us.
336 /* not AP/IBSS or ordered frame */
337 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
338 return TXRX_CONTINUE;
340 /* no stations in PS mode */
341 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
342 return TXRX_CONTINUE;
344 /* buffered in mac80211 */
345 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
346 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
347 purge_old_ps_buffers(tx->local);
348 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
350 if (net_ratelimit()) {
351 printk(KERN_DEBUG "%s: BC TX buffer full - "
352 "dropping the oldest frame\n",
355 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
357 tx->local->total_ps_buffered++;
358 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
362 /* buffered in hardware */
363 tx->u.tx.control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM;
365 return TXRX_CONTINUE;
368 static ieee80211_txrx_result
369 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
371 struct sta_info *sta = tx->sta;
372 DECLARE_MAC_BUF(mac);
375 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
376 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
377 return TXRX_CONTINUE;
379 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
380 struct ieee80211_tx_packet_data *pkt_data;
381 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
382 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
384 print_mac(mac, sta->addr), sta->aid,
385 skb_queue_len(&sta->ps_tx_buf));
386 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
387 sta->flags |= WLAN_STA_TIM;
388 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
389 purge_old_ps_buffers(tx->local);
390 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
391 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
392 if (net_ratelimit()) {
393 printk(KERN_DEBUG "%s: STA %s TX "
394 "buffer full - dropping oldest frame\n",
395 tx->dev->name, print_mac(mac, sta->addr));
399 tx->local->total_ps_buffered++;
400 /* Queue frame to be sent after STA sends an PS Poll frame */
401 if (skb_queue_empty(&sta->ps_tx_buf)) {
402 if (tx->local->ops->set_tim)
403 tx->local->ops->set_tim(local_to_hw(tx->local),
406 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
408 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
409 pkt_data->jiffies = jiffies;
410 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
413 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
414 else if (unlikely(sta->flags & WLAN_STA_PS)) {
415 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
416 "set -> send frame\n", tx->dev->name,
417 print_mac(mac, sta->addr));
419 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
422 return TXRX_CONTINUE;
425 static ieee80211_txrx_result
426 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
428 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
429 return TXRX_CONTINUE;
431 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
432 return ieee80211_tx_h_unicast_ps_buf(tx);
434 return ieee80211_tx_h_multicast_ps_buf(tx);
437 static ieee80211_txrx_result
438 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
440 struct ieee80211_key *key;
441 const struct ieee80211_hdr *hdr;
444 hdr = (const struct ieee80211_hdr *) tx->skb->data;
445 fc = le16_to_cpu(hdr->frame_control);
447 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
449 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
451 else if ((key = rcu_dereference(tx->sdata->default_key)))
453 else if (tx->sdata->drop_unencrypted &&
454 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
455 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
456 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
460 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
464 tx->key->tx_rx_count++;
465 /* TODO: add threshold stuff again */
468 return TXRX_CONTINUE;
471 static ieee80211_txrx_result
472 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
475 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
476 struct sk_buff **frags, *first, *frag;
480 int frag_threshold = tx->local->fragmentation_threshold;
482 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
483 return TXRX_CONTINUE;
487 hdrlen = ieee80211_get_hdrlen(tx->fc);
488 payload_len = first->len - hdrlen;
489 per_fragm = frag_threshold - hdrlen - FCS_LEN;
490 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
492 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
496 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
497 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
498 pos = first->data + hdrlen + per_fragm;
499 left = payload_len - per_fragm;
500 for (i = 0; i < num_fragm - 1; i++) {
501 struct ieee80211_hdr *fhdr;
507 /* reserve enough extra head and tail room for possible
510 dev_alloc_skb(tx->local->tx_headroom +
512 IEEE80211_ENCRYPT_HEADROOM +
513 IEEE80211_ENCRYPT_TAILROOM);
516 /* Make sure that all fragments use the same priority so
517 * that they end up using the same TX queue */
518 frag->priority = first->priority;
519 skb_reserve(frag, tx->local->tx_headroom +
520 IEEE80211_ENCRYPT_HEADROOM);
521 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
522 memcpy(fhdr, first->data, hdrlen);
523 if (i == num_fragm - 2)
524 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
525 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
526 copylen = left > per_fragm ? per_fragm : left;
527 memcpy(skb_put(frag, copylen), pos, copylen);
532 skb_trim(first, hdrlen + per_fragm);
534 tx->u.tx.num_extra_frag = num_fragm - 1;
535 tx->u.tx.extra_frag = frags;
537 return TXRX_CONTINUE;
540 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
542 for (i = 0; i < num_fragm - 1; i++)
544 dev_kfree_skb(frags[i]);
547 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
551 static ieee80211_txrx_result
552 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
555 return TXRX_CONTINUE;
557 switch (tx->key->conf.alg) {
559 return ieee80211_crypto_wep_encrypt(tx);
561 return ieee80211_crypto_tkip_encrypt(tx);
563 return ieee80211_crypto_ccmp_encrypt(tx);
571 static ieee80211_txrx_result
572 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
574 struct rate_selection rsel;
576 if (likely(!tx->u.tx.rate)) {
577 rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel);
578 tx->u.tx.rate = rsel.rate;
579 if (unlikely(rsel.probe != NULL)) {
580 tx->u.tx.control->flags |=
581 IEEE80211_TXCTL_RATE_CTRL_PROBE;
582 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
583 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
584 tx->u.tx.rate = rsel.probe;
586 tx->u.tx.control->alt_retry_rate = -1;
591 tx->u.tx.control->alt_retry_rate = -1;
593 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
594 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
595 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
596 tx->u.tx.last_frag_rate = tx->u.tx.rate;
598 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
600 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
601 tx->u.tx.rate = rsel.nonerp;
602 tx->u.tx.control->rate = rsel.nonerp;
603 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
605 tx->u.tx.last_frag_rate = tx->u.tx.rate;
606 tx->u.tx.control->rate = tx->u.tx.rate;
608 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
610 return TXRX_CONTINUE;
613 static ieee80211_txrx_result
614 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
616 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
617 u16 fc = le16_to_cpu(hdr->frame_control);
619 struct ieee80211_tx_control *control = tx->u.tx.control;
620 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
622 if (!control->retry_limit) {
623 if (!is_multicast_ether_addr(hdr->addr1)) {
624 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
625 && tx->local->rts_threshold <
626 IEEE80211_MAX_RTS_THRESHOLD) {
628 IEEE80211_TXCTL_USE_RTS_CTS;
630 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
631 control->retry_limit =
632 tx->local->long_retry_limit;
634 control->retry_limit =
635 tx->local->short_retry_limit;
638 control->retry_limit = 1;
642 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
643 /* Do not use multiple retry rates when sending fragmented
645 * TODO: The last fragment could still use multiple retry
647 control->alt_retry_rate = -1;
650 /* Use CTS protection for unicast frames sent using extended rates if
651 * there are associated non-ERP stations and RTS/CTS is not configured
653 if (mode->mode == MODE_IEEE80211G &&
654 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
655 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
656 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
657 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
658 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
660 /* Transmit data frames using short preambles if the driver supports
661 * short preambles at the selected rate and short preambles are
662 * available on the network at the current point in time. */
663 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
664 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
665 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
666 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
667 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
670 /* Setup duration field for the first fragment of the frame. Duration
671 * for remaining fragments will be updated when they are being sent
672 * to low-level driver in ieee80211_tx(). */
673 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
674 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
675 tx->u.tx.extra_frag[0]->len : 0);
676 hdr->duration_id = cpu_to_le16(dur);
678 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
679 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
680 struct ieee80211_rate *rate;
682 /* Do not use multiple retry rates when using RTS/CTS */
683 control->alt_retry_rate = -1;
685 /* Use min(data rate, max base rate) as CTS/RTS rate */
686 rate = tx->u.tx.rate;
687 while (rate > mode->rates &&
688 !(rate->flags & IEEE80211_RATE_BASIC))
691 control->rts_cts_rate = rate->val;
692 control->rts_rate = rate;
696 tx->sta->tx_packets++;
697 tx->sta->tx_fragments++;
698 tx->sta->tx_bytes += tx->skb->len;
699 if (tx->u.tx.extra_frag) {
701 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
702 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
704 tx->u.tx.extra_frag[i]->len;
710 * Tell hardware to not encrypt when we had sw crypto.
711 * Because we use the same flag to internally indicate that
712 * no (software) encryption should be done, we have to set it
713 * after all crypto handlers.
715 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
716 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
718 return TXRX_CONTINUE;
721 static ieee80211_txrx_result
722 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
724 struct ieee80211_local *local = tx->local;
725 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
726 struct sk_buff *skb = tx->skb;
727 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
728 u32 load = 0, hdrtime;
730 /* TODO: this could be part of tx_status handling, so that the number
731 * of retries would be known; TX rate should in that case be stored
732 * somewhere with the packet */
734 /* Estimate total channel use caused by this frame */
736 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
737 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
739 if (mode->mode == MODE_IEEE80211A ||
740 (mode->mode == MODE_IEEE80211G &&
741 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
742 hdrtime = CHAN_UTIL_HDR_SHORT;
744 hdrtime = CHAN_UTIL_HDR_LONG;
747 if (!is_multicast_ether_addr(hdr->addr1))
750 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
752 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
755 load += skb->len * tx->u.tx.rate->rate_inv;
757 if (tx->u.tx.extra_frag) {
759 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
761 load += tx->u.tx.extra_frag[i]->len *
766 /* Divide channel_use by 8 to avoid wrapping around the counter */
767 load >>= CHAN_UTIL_SHIFT;
768 local->channel_use_raw += load;
770 tx->sta->channel_use_raw += load;
771 tx->sdata->channel_use_raw += load;
773 return TXRX_CONTINUE;
776 /* TODO: implement register/unregister functions for adding TX/RX handlers
777 * into ordered list */
779 ieee80211_tx_handler ieee80211_tx_handlers[] =
781 ieee80211_tx_h_check_assoc,
782 ieee80211_tx_h_sequence,
783 ieee80211_tx_h_ps_buf,
784 ieee80211_tx_h_select_key,
785 ieee80211_tx_h_michael_mic_add,
786 ieee80211_tx_h_fragment,
787 ieee80211_tx_h_encrypt,
788 ieee80211_tx_h_rate_ctrl,
790 ieee80211_tx_h_load_stats,
794 /* actual transmit path */
797 * deal with packet injection down monitor interface
798 * with Radiotap Header -- only called for monitor mode interface
800 static ieee80211_txrx_result
801 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
805 * this is the moment to interpret and discard the radiotap header that
806 * must be at the start of the packet injected in Monitor mode
808 * Need to take some care with endian-ness since radiotap
809 * args are little-endian
812 struct ieee80211_radiotap_iterator iterator;
813 struct ieee80211_radiotap_header *rthdr =
814 (struct ieee80211_radiotap_header *) skb->data;
815 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
816 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
817 struct ieee80211_tx_control *control = tx->u.tx.control;
819 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
820 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
821 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
824 * for every radiotap entry that is present
825 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
826 * entries present, or -EINVAL on error)
832 ret = ieee80211_radiotap_iterator_next(&iterator);
837 /* see if this argument is something we can use */
838 switch (iterator.this_arg_index) {
840 * You must take care when dereferencing iterator.this_arg
841 * for multibyte types... the pointer is not aligned. Use
842 * get_unaligned((type *)iterator.this_arg) to dereference
843 * iterator.this_arg for type "type" safely on all arches.
845 case IEEE80211_RADIOTAP_RATE:
847 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
848 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
850 target_rate = (*iterator.this_arg) * 5;
851 for (i = 0; i < mode->num_rates; i++) {
852 struct ieee80211_rate *r = &mode->rates[i];
854 if (r->rate == target_rate) {
861 case IEEE80211_RADIOTAP_ANTENNA:
863 * radiotap uses 0 for 1st ant, mac80211 is 1 for
866 control->antenna_sel_tx = (*iterator.this_arg) + 1;
869 case IEEE80211_RADIOTAP_DBM_TX_POWER:
870 control->power_level = *iterator.this_arg;
873 case IEEE80211_RADIOTAP_FLAGS:
874 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
876 * this indicates that the skb we have been
877 * handed has the 32-bit FCS CRC at the end...
878 * we should react to that by snipping it off
879 * because it will be recomputed and added
882 if (skb->len < (iterator.max_length + FCS_LEN))
885 skb_trim(skb, skb->len - FCS_LEN);
887 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
889 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
890 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
891 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
895 * Please update the file
896 * Documentation/networking/mac80211-injection.txt
897 * when parsing new fields here.
905 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
909 * remove the radiotap header
910 * iterator->max_length was sanity-checked against
911 * skb->len by iterator init
913 skb_pull(skb, iterator.max_length);
915 return TXRX_CONTINUE;
921 static ieee80211_txrx_result
922 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
924 struct net_device *dev,
925 struct ieee80211_tx_control *control)
927 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
928 struct ieee80211_hdr *hdr;
929 struct ieee80211_sub_if_data *sdata;
930 ieee80211_txrx_result res = TXRX_CONTINUE;
934 memset(tx, 0, sizeof(*tx));
936 tx->dev = dev; /* use original interface */
938 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
939 tx->u.tx.control = control;
941 * Set this flag (used below to indicate "automatic fragmentation"),
942 * it will be cleared/left by radiotap as desired.
944 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
946 /* process and remove the injection radiotap header */
947 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
948 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
949 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
953 * __ieee80211_parse_tx_radiotap has now removed
954 * the radiotap header that was present and pre-filled
955 * 'tx' with tx control information.
959 hdr = (struct ieee80211_hdr *) skb->data;
961 tx->sta = sta_info_get(local, hdr->addr1);
962 tx->fc = le16_to_cpu(hdr->frame_control);
964 if (is_multicast_ether_addr(hdr->addr1)) {
965 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
966 control->flags |= IEEE80211_TXCTL_NO_ACK;
968 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
969 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
972 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
973 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
974 skb->len + FCS_LEN > local->fragmentation_threshold &&
975 !local->ops->set_frag_threshold)
976 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
978 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
982 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
983 else if (tx->sta->clear_dst_mask) {
984 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
985 tx->sta->clear_dst_mask = 0;
988 hdrlen = ieee80211_get_hdrlen(tx->fc);
989 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
990 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
991 tx->ethertype = (pos[0] << 8) | pos[1];
993 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
998 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1001 * NB: @tx is uninitialised when passed in here
1003 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1004 struct sk_buff *skb,
1005 struct net_device *mdev,
1006 struct ieee80211_tx_control *control)
1008 struct ieee80211_tx_packet_data *pkt_data;
1009 struct net_device *dev;
1011 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1012 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1013 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1019 /* initialises tx with control */
1020 __ieee80211_tx_prepare(tx, skb, dev, control);
1024 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1025 struct ieee80211_txrx_data *tx)
1027 struct ieee80211_tx_control *control = tx->u.tx.control;
1030 if (!ieee80211_qdisc_installed(local->mdev) &&
1031 __ieee80211_queue_stopped(local, 0)) {
1032 netif_stop_queue(local->mdev);
1033 return IEEE80211_TX_AGAIN;
1036 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1037 "TX to low-level driver", skb);
1038 ret = local->ops->tx(local_to_hw(local), skb, control);
1040 return IEEE80211_TX_AGAIN;
1041 local->mdev->trans_start = jiffies;
1042 ieee80211_led_tx(local, 1);
1044 if (tx->u.tx.extra_frag) {
1045 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1046 IEEE80211_TXCTL_USE_CTS_PROTECT |
1047 IEEE80211_TXCTL_CLEAR_DST_MASK |
1048 IEEE80211_TXCTL_FIRST_FRAGMENT);
1049 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1050 if (!tx->u.tx.extra_frag[i])
1052 if (__ieee80211_queue_stopped(local, control->queue))
1053 return IEEE80211_TX_FRAG_AGAIN;
1054 if (i == tx->u.tx.num_extra_frag) {
1055 control->tx_rate = tx->u.tx.last_frag_hwrate;
1056 control->rate = tx->u.tx.last_frag_rate;
1057 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1059 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1062 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1065 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1066 "TX to low-level driver",
1067 tx->u.tx.extra_frag[i]);
1068 ret = local->ops->tx(local_to_hw(local),
1069 tx->u.tx.extra_frag[i],
1072 return IEEE80211_TX_FRAG_AGAIN;
1073 local->mdev->trans_start = jiffies;
1074 ieee80211_led_tx(local, 1);
1075 tx->u.tx.extra_frag[i] = NULL;
1077 kfree(tx->u.tx.extra_frag);
1078 tx->u.tx.extra_frag = NULL;
1080 return IEEE80211_TX_OK;
1083 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1084 struct ieee80211_tx_control *control)
1086 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1087 struct sta_info *sta;
1088 ieee80211_tx_handler *handler;
1089 struct ieee80211_txrx_data tx;
1090 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1093 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1095 if (unlikely(skb->len < 10)) {
1100 /* initialises tx */
1101 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1103 if (res_prepare == TXRX_DROP) {
1109 * key references are protected using RCU and this requires that
1110 * we are in a read-site RCU section during receive processing
1115 tx.u.tx.mode = local->hw.conf.mode;
1117 for (handler = local->tx_handlers; *handler != NULL;
1119 res = (*handler)(&tx);
1120 if (res != TXRX_CONTINUE)
1124 skb = tx.skb; /* handlers are allowed to change skb */
1129 if (unlikely(res == TXRX_DROP)) {
1130 I802_DEBUG_INC(local->tx_handlers_drop);
1134 if (unlikely(res == TXRX_QUEUED)) {
1135 I802_DEBUG_INC(local->tx_handlers_queued);
1140 if (tx.u.tx.extra_frag) {
1141 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1143 struct ieee80211_hdr *hdr =
1144 (struct ieee80211_hdr *)
1145 tx.u.tx.extra_frag[i]->data;
1147 if (i + 1 < tx.u.tx.num_extra_frag) {
1148 next_len = tx.u.tx.extra_frag[i + 1]->len;
1151 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1152 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1154 dur = ieee80211_duration(&tx, 0, next_len);
1155 hdr->duration_id = cpu_to_le16(dur);
1160 ret = __ieee80211_tx(local, skb, &tx);
1162 struct ieee80211_tx_stored_packet *store =
1163 &local->pending_packet[control->queue];
1165 if (ret == IEEE80211_TX_FRAG_AGAIN)
1167 set_bit(IEEE80211_LINK_STATE_PENDING,
1168 &local->state[control->queue]);
1170 /* When the driver gets out of buffers during sending of
1171 * fragments and calls ieee80211_stop_queue, there is
1172 * a small window between IEEE80211_LINK_STATE_XOFF and
1173 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1174 * gets available in that window (i.e. driver calls
1175 * ieee80211_wake_queue), we would end up with ieee80211_tx
1176 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1177 * continuing transmitting here when that situation is
1178 * possible to have happened. */
1179 if (!__ieee80211_queue_stopped(local, control->queue)) {
1180 clear_bit(IEEE80211_LINK_STATE_PENDING,
1181 &local->state[control->queue]);
1184 memcpy(&store->control, control,
1185 sizeof(struct ieee80211_tx_control));
1187 store->extra_frag = tx.u.tx.extra_frag;
1188 store->num_extra_frag = tx.u.tx.num_extra_frag;
1189 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1190 store->last_frag_rate = tx.u.tx.last_frag_rate;
1191 store->last_frag_rate_ctrl_probe =
1192 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1200 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1201 if (tx.u.tx.extra_frag[i])
1202 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1203 kfree(tx.u.tx.extra_frag);
1208 /* device xmit handlers */
1210 int ieee80211_master_start_xmit(struct sk_buff *skb,
1211 struct net_device *dev)
1213 struct ieee80211_tx_control control;
1214 struct ieee80211_tx_packet_data *pkt_data;
1215 struct net_device *odev = NULL;
1216 struct ieee80211_sub_if_data *osdata;
1221 * copy control out of the skb so other people can use skb->cb
1223 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1224 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1226 if (pkt_data->ifindex)
1227 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1228 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1232 if (unlikely(!odev)) {
1233 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1234 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1235 "originating device\n", dev->name);
1240 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1242 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1243 if (skb_headroom(skb) < headroom) {
1244 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1251 control.ifindex = odev->ifindex;
1252 control.type = osdata->type;
1253 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1254 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1255 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1256 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1257 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1258 control.flags |= IEEE80211_TXCTL_REQUEUE;
1259 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
1260 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
1261 control.queue = pkt_data->queue;
1263 ret = ieee80211_tx(odev, skb, &control);
1269 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1270 struct net_device *dev)
1272 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1273 struct ieee80211_tx_packet_data *pkt_data;
1274 struct ieee80211_radiotap_header *prthdr =
1275 (struct ieee80211_radiotap_header *)skb->data;
1278 /* check for not even having the fixed radiotap header part */
1279 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1280 goto fail; /* too short to be possibly valid */
1282 /* is it a header version we can trust to find length from? */
1283 if (unlikely(prthdr->it_version))
1284 goto fail; /* only version 0 is supported */
1286 /* then there must be a radiotap header with a length we can use */
1287 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1289 /* does the skb contain enough to deliver on the alleged length? */
1290 if (unlikely(skb->len < len_rthdr))
1291 goto fail; /* skb too short for claimed rt header extent */
1293 skb->dev = local->mdev;
1295 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1296 memset(pkt_data, 0, sizeof(*pkt_data));
1297 /* needed because we set skb device to master */
1298 pkt_data->ifindex = dev->ifindex;
1300 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1303 * fix up the pointers accounting for the radiotap
1304 * header still being in there. We are being given
1305 * a precooked IEEE80211 header so no need for
1308 skb_set_mac_header(skb, len_rthdr);
1310 * these are just fixed to the end of the rt area since we
1311 * don't have any better information and at this point, nobody cares
1313 skb_set_network_header(skb, len_rthdr);
1314 skb_set_transport_header(skb, len_rthdr);
1316 /* pass the radiotap header up to the next stage intact */
1317 dev_queue_xmit(skb);
1318 return NETDEV_TX_OK;
1322 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1326 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1327 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1328 * @skb: packet to be sent
1329 * @dev: incoming interface
1331 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1332 * not be freed, and caller is responsible for either retrying later or freeing
1335 * This function takes in an Ethernet header and encapsulates it with suitable
1336 * IEEE 802.11 header based on which interface the packet is coming in. The
1337 * encapsulated packet will then be passed to master interface, wlan#.11, for
1338 * transmission (through low-level driver).
1340 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1341 struct net_device *dev)
1343 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1344 struct ieee80211_tx_packet_data *pkt_data;
1345 struct ieee80211_sub_if_data *sdata;
1346 int ret = 1, head_need;
1347 u16 ethertype, hdrlen, fc;
1348 struct ieee80211_hdr hdr;
1349 const u8 *encaps_data;
1350 int encaps_len, skip_header_bytes;
1352 struct sta_info *sta;
1355 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1356 if (unlikely(skb->len < ETH_HLEN)) {
1357 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1358 dev->name, skb->len);
1363 nh_pos = skb_network_header(skb) - skb->data;
1364 h_pos = skb_transport_header(skb) - skb->data;
1366 /* convert Ethernet header to proper 802.11 header (based on
1367 * operation mode) */
1368 ethertype = (skb->data[12] << 8) | skb->data[13];
1369 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1371 switch (sdata->type) {
1372 case IEEE80211_IF_TYPE_AP:
1373 case IEEE80211_IF_TYPE_VLAN:
1374 fc |= IEEE80211_FCTL_FROMDS;
1376 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1377 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1378 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1381 case IEEE80211_IF_TYPE_WDS:
1382 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1384 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1385 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1386 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1387 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1390 case IEEE80211_IF_TYPE_STA:
1391 fc |= IEEE80211_FCTL_TODS;
1393 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1394 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1395 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1398 case IEEE80211_IF_TYPE_IBSS:
1400 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1401 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1402 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1410 sta = sta_info_get(local, hdr.addr1);
1412 sta_flags = sta->flags;
1416 /* receiver is QoS enabled, use a QoS type frame */
1417 if (sta_flags & WLAN_STA_WME) {
1418 fc |= IEEE80211_STYPE_QOS_DATA;
1423 * If port access control is enabled, drop frames to unauthorised
1424 * stations unless they are EAPOL frames from the local station.
1426 if (unlikely(sdata->ieee802_1x_pac &&
1427 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1428 !(ethertype == ETH_P_PAE &&
1429 compare_ether_addr(dev->dev_addr,
1430 skb->data + ETH_ALEN) == 0))) {
1431 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1432 DECLARE_MAC_BUF(mac);
1434 if (net_ratelimit())
1435 printk(KERN_DEBUG "%s: dropped frame to %s"
1436 " (unauthorized port)\n", dev->name,
1437 print_mac(mac, hdr.addr1));
1440 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1446 hdr.frame_control = cpu_to_le16(fc);
1447 hdr.duration_id = 0;
1450 skip_header_bytes = ETH_HLEN;
1451 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1452 encaps_data = bridge_tunnel_header;
1453 encaps_len = sizeof(bridge_tunnel_header);
1454 skip_header_bytes -= 2;
1455 } else if (ethertype >= 0x600) {
1456 encaps_data = rfc1042_header;
1457 encaps_len = sizeof(rfc1042_header);
1458 skip_header_bytes -= 2;
1464 skb_pull(skb, skip_header_bytes);
1465 nh_pos -= skip_header_bytes;
1466 h_pos -= skip_header_bytes;
1468 /* TODO: implement support for fragments so that there is no need to
1469 * reallocate and copy payload; it might be enough to support one
1470 * extra fragment that would be copied in the beginning of the frame
1471 * data.. anyway, it would be nice to include this into skb structure
1474 * There are few options for this:
1475 * use skb->cb as an extra space for 802.11 header
1476 * allocate new buffer if not enough headroom
1477 * make sure that there is enough headroom in every skb by increasing
1478 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1479 * alloc_skb() (net/core/skbuff.c)
1481 head_need = hdrlen + encaps_len + local->tx_headroom;
1482 head_need -= skb_headroom(skb);
1484 /* We are going to modify skb data, so make a copy of it if happens to
1485 * be cloned. This could happen, e.g., with Linux bridge code passing
1486 * us broadcast frames. */
1488 if (head_need > 0 || skb_cloned(skb)) {
1490 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1491 "of headroom\n", dev->name, head_need);
1494 if (skb_cloned(skb))
1495 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1497 I802_DEBUG_INC(local->tx_expand_skb_head);
1498 /* Since we have to reallocate the buffer, make sure that there
1499 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1500 * before payload and 12 after). */
1501 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1503 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1510 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1511 nh_pos += encaps_len;
1512 h_pos += encaps_len;
1515 if (fc & IEEE80211_STYPE_QOS_DATA) {
1516 __le16 *qos_control;
1518 qos_control = (__le16*) skb_push(skb, 2);
1519 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1521 * Maybe we could actually set some fields here, for now just
1522 * initialise to zero to indicate no special operation.
1526 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1531 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1532 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1533 pkt_data->ifindex = dev->ifindex;
1534 if (ethertype == ETH_P_PAE)
1535 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1537 skb->dev = local->mdev;
1538 dev->stats.tx_packets++;
1539 dev->stats.tx_bytes += skb->len;
1541 /* Update skb pointers to various headers since this modified frame
1542 * is going to go through Linux networking code that may potentially
1543 * need things like pointer to IP header. */
1544 skb_set_mac_header(skb, 0);
1545 skb_set_network_header(skb, nh_pos);
1546 skb_set_transport_header(skb, h_pos);
1548 dev->trans_start = jiffies;
1549 dev_queue_xmit(skb);
1560 /* helper functions for pending packets for when queues are stopped */
1562 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1565 struct ieee80211_tx_stored_packet *store;
1567 for (i = 0; i < local->hw.queues; i++) {
1568 if (!__ieee80211_queue_pending(local, i))
1570 store = &local->pending_packet[i];
1571 kfree_skb(store->skb);
1572 for (j = 0; j < store->num_extra_frag; j++)
1573 kfree_skb(store->extra_frag[j]);
1574 kfree(store->extra_frag);
1575 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1579 void ieee80211_tx_pending(unsigned long data)
1581 struct ieee80211_local *local = (struct ieee80211_local *)data;
1582 struct net_device *dev = local->mdev;
1583 struct ieee80211_tx_stored_packet *store;
1584 struct ieee80211_txrx_data tx;
1585 int i, ret, reschedule = 0;
1587 netif_tx_lock_bh(dev);
1588 for (i = 0; i < local->hw.queues; i++) {
1589 if (__ieee80211_queue_stopped(local, i))
1591 if (!__ieee80211_queue_pending(local, i)) {
1595 store = &local->pending_packet[i];
1596 tx.u.tx.control = &store->control;
1597 tx.u.tx.extra_frag = store->extra_frag;
1598 tx.u.tx.num_extra_frag = store->num_extra_frag;
1599 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1600 tx.u.tx.last_frag_rate = store->last_frag_rate;
1602 if (store->last_frag_rate_ctrl_probe)
1603 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1604 ret = __ieee80211_tx(local, store->skb, &tx);
1606 if (ret == IEEE80211_TX_FRAG_AGAIN)
1609 clear_bit(IEEE80211_LINK_STATE_PENDING,
1614 netif_tx_unlock_bh(dev);
1616 if (!ieee80211_qdisc_installed(dev)) {
1617 if (!__ieee80211_queue_stopped(local, 0))
1618 netif_wake_queue(dev);
1620 netif_schedule(dev);
1624 /* functions for drivers to get certain frames */
1626 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1627 struct ieee80211_if_ap *bss,
1628 struct sk_buff *skb)
1632 int i, have_bits = 0, n1, n2;
1634 /* Generate bitmap for TIM only if there are any STAs in power save
1636 read_lock_bh(&local->sta_lock);
1637 if (atomic_read(&bss->num_sta_ps) > 0)
1638 /* in the hope that this is faster than
1639 * checking byte-for-byte */
1640 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1641 IEEE80211_MAX_AID+1);
1643 if (bss->dtim_count == 0)
1644 bss->dtim_count = bss->dtim_period - 1;
1648 tim = pos = (u8 *) skb_put(skb, 6);
1649 *pos++ = WLAN_EID_TIM;
1651 *pos++ = bss->dtim_count;
1652 *pos++ = bss->dtim_period;
1654 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1658 /* Find largest even number N1 so that bits numbered 1 through
1659 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1660 * (N2 + 1) x 8 through 2007 are 0. */
1662 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1669 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1676 /* Bitmap control */
1678 /* Part Virt Bitmap */
1679 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1681 tim[1] = n2 - n1 + 4;
1682 skb_put(skb, n2 - n1);
1684 *pos++ = aid0; /* Bitmap control */
1685 *pos++ = 0; /* Part Virt Bitmap */
1687 read_unlock_bh(&local->sta_lock);
1690 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1691 struct ieee80211_tx_control *control)
1693 struct ieee80211_local *local = hw_to_local(hw);
1694 struct sk_buff *skb;
1695 struct net_device *bdev;
1696 struct ieee80211_sub_if_data *sdata = NULL;
1697 struct ieee80211_if_ap *ap = NULL;
1698 struct rate_selection rsel;
1699 u8 *b_head, *b_tail;
1702 bdev = dev_get_by_index(&init_net, if_id);
1704 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1709 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1711 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1712 if (net_ratelimit())
1713 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1714 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1715 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1719 /* Assume we are generating the normal beacon locally */
1720 b_head = ap->beacon_head;
1721 b_tail = ap->beacon_tail;
1722 bh_len = ap->beacon_head_len;
1723 bt_len = ap->beacon_tail_len;
1725 skb = dev_alloc_skb(local->tx_headroom +
1726 bh_len + bt_len + 256 /* maximum TIM len */);
1730 skb_reserve(skb, local->tx_headroom);
1731 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1733 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1735 ieee80211_beacon_add_tim(local, ap, skb);
1738 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1742 rate_control_get_rate(local->mdev, local->oper_hw_mode, skb,
1745 if (net_ratelimit()) {
1746 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1748 wiphy_name(local->hw.wiphy));
1755 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1756 (rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1757 rsel.rate->val2 : rsel.rate->val;
1758 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1759 control->power_level = local->hw.conf.power_level;
1760 control->flags |= IEEE80211_TXCTL_NO_ACK;
1761 control->retry_limit = 1;
1762 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1768 EXPORT_SYMBOL(ieee80211_beacon_get);
1770 void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
1771 const void *frame, size_t frame_len,
1772 const struct ieee80211_tx_control *frame_txctl,
1773 struct ieee80211_rts *rts)
1775 const struct ieee80211_hdr *hdr = frame;
1778 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1779 rts->frame_control = cpu_to_le16(fctl);
1780 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
1781 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1782 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1784 EXPORT_SYMBOL(ieee80211_rts_get);
1786 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
1787 const void *frame, size_t frame_len,
1788 const struct ieee80211_tx_control *frame_txctl,
1789 struct ieee80211_cts *cts)
1791 const struct ieee80211_hdr *hdr = frame;
1794 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1795 cts->frame_control = cpu_to_le16(fctl);
1796 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
1797 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1799 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1802 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1803 struct ieee80211_tx_control *control)
1805 struct ieee80211_local *local = hw_to_local(hw);
1806 struct sk_buff *skb;
1807 struct sta_info *sta;
1808 ieee80211_tx_handler *handler;
1809 struct ieee80211_txrx_data tx;
1810 ieee80211_txrx_result res = TXRX_DROP;
1811 struct net_device *bdev;
1812 struct ieee80211_sub_if_data *sdata;
1813 struct ieee80211_if_ap *bss = NULL;
1815 bdev = dev_get_by_index(&init_net, if_id);
1817 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1821 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1824 if (bss->dtim_count != 0)
1825 return NULL; /* send buffered bc/mc only after DTIM beacon */
1826 memset(control, 0, sizeof(*control));
1828 skb = skb_dequeue(&bss->ps_bc_buf);
1831 local->total_ps_buffered--;
1833 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1834 struct ieee80211_hdr *hdr =
1835 (struct ieee80211_hdr *) skb->data;
1836 /* more buffered multicast/broadcast frames ==> set
1837 * MoreData flag in IEEE 802.11 header to inform PS
1839 hdr->frame_control |=
1840 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1843 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1845 dev_kfree_skb_any(skb);
1848 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1849 tx.u.tx.mode = local->hw.conf.mode;
1851 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1852 res = (*handler)(&tx);
1853 if (res == TXRX_DROP || res == TXRX_QUEUED)
1857 skb = tx.skb; /* handlers are allowed to change skb */
1859 if (res == TXRX_DROP) {
1860 I802_DEBUG_INC(local->tx_handlers_drop);
1863 } else if (res == TXRX_QUEUED) {
1864 I802_DEBUG_INC(local->tx_handlers_queued);
1873 EXPORT_SYMBOL(ieee80211_get_buffered_bc);