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"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
41 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
42 struct ieee80211_hdr *hdr)
44 /* Set the sequence number for this frame. */
45 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
47 /* Increase the sequence number. */
48 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
51 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
52 static void ieee80211_dump_frame(const char *ifname, const char *title,
53 const struct sk_buff *skb)
55 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
60 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
66 fc = le16_to_cpu(hdr->frame_control);
67 hdrlen = ieee80211_get_hdrlen(fc);
68 if (hdrlen > skb->len)
71 printk(" FC=0x%04x DUR=0x%04x",
72 fc, le16_to_cpu(hdr->duration_id));
74 printk(" A1=%s", print_mac(mac, hdr->addr1));
76 printk(" A2=%s", print_mac(mac, hdr->addr2));
78 printk(" A3=%s", print_mac(mac, hdr->addr3));
80 printk(" A4=%s", print_mac(mac, hdr->addr4));
83 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
84 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
88 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
90 static u16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
93 int rate, mrate, erp, dur, i;
94 struct ieee80211_rate *txrate;
95 struct ieee80211_local *local = tx->local;
96 struct ieee80211_supported_band *sband;
98 sband = local->hw.wiphy->bands[tx->channel->band];
99 txrate = &sband->bitrates[tx->rate_idx];
102 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
103 erp = txrate->flags & IEEE80211_RATE_ERP_G;
106 * data and mgmt (except PS Poll):
107 * - during CFP: 32768
108 * - during contention period:
109 * if addr1 is group address: 0
110 * if more fragments = 0 and addr1 is individual address: time to
111 * transmit one ACK plus SIFS
112 * if more fragments = 1 and addr1 is individual address: time to
113 * transmit next fragment plus 2 x ACK plus 3 x SIFS
116 * - control response frame (CTS or ACK) shall be transmitted using the
117 * same rate as the immediately previous frame in the frame exchange
118 * sequence, if this rate belongs to the PHY mandatory rates, or else
119 * at the highest possible rate belonging to the PHY rates in the
123 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
124 /* TODO: These control frames are not currently sent by
125 * 80211.o, but should they be implemented, this function
126 * needs to be updated to support duration field calculation.
128 * RTS: time needed to transmit pending data/mgmt frame plus
129 * one CTS frame plus one ACK frame plus 3 x SIFS
130 * CTS: duration of immediately previous RTS minus time
131 * required to transmit CTS and its SIFS
132 * ACK: 0 if immediately previous directed data/mgmt had
133 * more=0, with more=1 duration in ACK frame is duration
134 * from previous frame minus time needed to transmit ACK
136 * PS Poll: BIT(15) | BIT(14) | aid
142 if (0 /* FIX: data/mgmt during CFP */)
145 if (group_addr) /* Group address as the destination - no ACK */
148 /* Individual destination address:
149 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
150 * CTS and ACK frames shall be transmitted using the highest rate in
151 * basic rate set that is less than or equal to the rate of the
152 * immediately previous frame and that is using the same modulation
153 * (CCK or OFDM). If no basic rate set matches with these requirements,
154 * the highest mandatory rate of the PHY that is less than or equal to
155 * the rate of the previous frame is used.
156 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
159 /* use lowest available if everything fails */
160 mrate = sband->bitrates[0].bitrate;
161 for (i = 0; i < sband->n_bitrates; i++) {
162 struct ieee80211_rate *r = &sband->bitrates[i];
164 if (r->bitrate > txrate->bitrate)
167 if (tx->sdata->basic_rates & BIT(i))
170 switch (sband->band) {
171 case IEEE80211_BAND_2GHZ: {
173 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
174 flag = IEEE80211_RATE_MANDATORY_G;
176 flag = IEEE80211_RATE_MANDATORY_B;
181 case IEEE80211_BAND_5GHZ:
182 if (r->flags & IEEE80211_RATE_MANDATORY_A)
185 case IEEE80211_NUM_BANDS:
191 /* No matching basic rate found; use highest suitable mandatory
196 /* Time needed to transmit ACK
197 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
198 * to closest integer */
200 dur = ieee80211_frame_duration(local, 10, rate, erp,
201 tx->sdata->bss_conf.use_short_preamble);
204 /* Frame is fragmented: duration increases with time needed to
205 * transmit next fragment plus ACK and 2 x SIFS. */
206 dur *= 2; /* ACK + SIFS */
208 dur += ieee80211_frame_duration(local, next_frag_len,
209 txrate->bitrate, erp,
210 tx->sdata->bss_conf.use_short_preamble);
216 static int inline is_ieee80211_device(struct net_device *dev,
217 struct net_device *master)
219 return (wdev_priv(dev->ieee80211_ptr) ==
220 wdev_priv(master->ieee80211_ptr));
225 static ieee80211_tx_result
226 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
228 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
229 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
230 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
231 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
234 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
237 if (unlikely(tx->local->sta_sw_scanning) &&
238 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
239 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
242 if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT)
245 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
248 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
250 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
251 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
252 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
253 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
254 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
255 DECLARE_MAC_BUF(mac);
256 printk(KERN_DEBUG "%s: dropped data frame to not "
257 "associated station %s\n",
258 tx->dev->name, print_mac(mac, hdr->addr1));
259 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
260 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
264 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
265 tx->local->num_sta == 0 &&
266 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
268 * No associated STAs - no need to send multicast
279 static ieee80211_tx_result
280 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
282 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
284 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
285 ieee80211_include_sequence(tx->sdata, hdr);
290 /* This function is called whenever the AP is about to exceed the maximum limit
291 * of buffered frames for power saving STAs. This situation should not really
292 * happen often during normal operation, so dropping the oldest buffered packet
293 * from each queue should be OK to make some room for new frames. */
294 static void purge_old_ps_buffers(struct ieee80211_local *local)
296 int total = 0, purged = 0;
298 struct ieee80211_sub_if_data *sdata;
299 struct sta_info *sta;
302 * virtual interfaces are protected by RCU
306 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
307 struct ieee80211_if_ap *ap;
308 if (sdata->dev == local->mdev ||
309 sdata->vif.type != IEEE80211_IF_TYPE_AP)
312 skb = skb_dequeue(&ap->ps_bc_buf);
317 total += skb_queue_len(&ap->ps_bc_buf);
320 list_for_each_entry_rcu(sta, &local->sta_list, list) {
321 skb = skb_dequeue(&sta->ps_tx_buf);
326 total += skb_queue_len(&sta->ps_tx_buf);
331 local->total_ps_buffered = total;
332 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
333 wiphy_name(local->hw.wiphy), purged);
336 static ieee80211_tx_result
337 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
339 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
342 * broadcast/multicast frame
344 * If any of the associated stations is in power save mode,
345 * the frame is buffered to be sent after DTIM beacon frame.
346 * This is done either by the hardware or us.
349 /* not AP/IBSS or ordered frame */
350 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
353 /* no stations in PS mode */
354 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
357 /* buffered in mac80211 */
358 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
359 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
360 purge_old_ps_buffers(tx->local);
361 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
363 if (net_ratelimit()) {
364 printk(KERN_DEBUG "%s: BC TX buffer full - "
365 "dropping the oldest frame\n",
368 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
370 tx->local->total_ps_buffered++;
371 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
375 /* buffered in hardware */
376 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
381 static ieee80211_tx_result
382 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
384 struct sta_info *sta = tx->sta;
385 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
387 DECLARE_MAC_BUF(mac);
390 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
391 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
394 staflags = get_sta_flags(sta);
396 if (unlikely((staflags & WLAN_STA_PS) &&
397 !(staflags & WLAN_STA_PSPOLL))) {
398 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
399 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
401 print_mac(mac, sta->addr), sta->aid,
402 skb_queue_len(&sta->ps_tx_buf));
403 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
404 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
405 purge_old_ps_buffers(tx->local);
406 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
407 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
408 if (net_ratelimit()) {
409 printk(KERN_DEBUG "%s: STA %s TX "
410 "buffer full - dropping oldest frame\n",
411 tx->dev->name, print_mac(mac, sta->addr));
415 tx->local->total_ps_buffered++;
417 /* Queue frame to be sent after STA sends an PS Poll frame */
418 if (skb_queue_empty(&sta->ps_tx_buf))
419 sta_info_set_tim_bit(sta);
421 info->control.jiffies = jiffies;
422 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
425 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
426 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
427 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
428 "set -> send frame\n", tx->dev->name,
429 print_mac(mac, sta->addr));
431 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
432 clear_sta_flags(sta, WLAN_STA_PSPOLL);
437 static ieee80211_tx_result
438 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
440 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
443 if (tx->flags & IEEE80211_TX_UNICAST)
444 return ieee80211_tx_h_unicast_ps_buf(tx);
446 return ieee80211_tx_h_multicast_ps_buf(tx);
449 static ieee80211_tx_result
450 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
452 struct ieee80211_key *key;
453 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
456 if (unlikely(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT))
458 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
460 else if ((key = rcu_dereference(tx->sdata->default_key)))
462 else if (tx->sdata->drop_unencrypted &&
463 !(info->flags & IEEE80211_TX_CTL_EAPOL_FRAME) &&
464 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
465 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
473 tx->key->tx_rx_count++;
474 /* TODO: add threshold stuff again */
476 switch (tx->key->conf.alg) {
478 ftype = fc & IEEE80211_FCTL_FTYPE;
479 stype = fc & IEEE80211_FCTL_STYPE;
481 if (ftype == IEEE80211_FTYPE_MGMT &&
482 stype == IEEE80211_STYPE_AUTH)
486 if (!WLAN_FC_DATA_PRESENT(fc))
492 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
493 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
498 static ieee80211_tx_result
499 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
501 struct rate_selection rsel;
502 struct ieee80211_supported_band *sband;
503 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
505 sband = tx->local->hw.wiphy->bands[tx->channel->band];
507 if (likely(tx->rate_idx < 0)) {
508 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
509 tx->rate_idx = rsel.rate_idx;
510 if (unlikely(rsel.probe_idx >= 0)) {
511 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
512 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
513 info->control.alt_retry_rate_idx = tx->rate_idx;
514 tx->rate_idx = rsel.probe_idx;
516 info->control.alt_retry_rate_idx = -1;
518 if (unlikely(tx->rate_idx < 0))
521 info->control.alt_retry_rate_idx = -1;
523 if (tx->sdata->bss_conf.use_cts_prot &&
524 (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
525 tx->last_frag_rate_idx = tx->rate_idx;
526 if (rsel.probe_idx >= 0)
527 tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG;
529 tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
530 tx->rate_idx = rsel.nonerp_idx;
531 info->tx_rate_idx = rsel.nonerp_idx;
532 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
534 tx->last_frag_rate_idx = tx->rate_idx;
535 info->tx_rate_idx = tx->rate_idx;
537 info->tx_rate_idx = tx->rate_idx;
542 static ieee80211_tx_result
543 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
545 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
546 u16 fc = le16_to_cpu(hdr->frame_control);
548 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
549 struct ieee80211_supported_band *sband;
551 sband = tx->local->hw.wiphy->bands[tx->channel->band];
554 info->control.aid = tx->sta->aid;
556 if (!info->control.retry_limit) {
557 if (!is_multicast_ether_addr(hdr->addr1)) {
558 int len = min_t(int, tx->skb->len + FCS_LEN,
559 tx->local->fragmentation_threshold);
560 if (len > tx->local->rts_threshold
561 && tx->local->rts_threshold <
562 IEEE80211_MAX_RTS_THRESHOLD) {
563 info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS;
565 IEEE80211_TX_CTL_LONG_RETRY_LIMIT;
566 info->control.retry_limit =
567 tx->local->long_retry_limit;
569 info->control.retry_limit =
570 tx->local->short_retry_limit;
573 info->control.retry_limit = 1;
577 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
578 /* Do not use multiple retry rates when sending fragmented
580 * TODO: The last fragment could still use multiple retry
582 info->control.alt_retry_rate_idx = -1;
585 /* Use CTS protection for unicast frames sent using extended rates if
586 * there are associated non-ERP stations and RTS/CTS is not configured
588 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
589 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) &&
590 (tx->flags & IEEE80211_TX_UNICAST) &&
591 tx->sdata->bss_conf.use_cts_prot &&
592 !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS))
593 info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT;
595 /* Transmit data frames using short preambles if the driver supports
596 * short preambles at the selected rate and short preambles are
597 * available on the network at the current point in time. */
598 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
599 (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
600 tx->sdata->bss_conf.use_short_preamble &&
601 (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) {
602 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
605 /* Setup duration field for the first fragment of the frame. Duration
606 * for remaining fragments will be updated when they are being sent
607 * to low-level driver in ieee80211_tx(). */
608 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
609 (tx->flags & IEEE80211_TX_FRAGMENTED) ?
610 tx->extra_frag[0]->len : 0);
611 hdr->duration_id = cpu_to_le16(dur);
613 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
614 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
615 struct ieee80211_supported_band *sband;
616 struct ieee80211_rate *rate;
620 sband = tx->local->hw.wiphy->bands[tx->channel->band];
622 /* Do not use multiple retry rates when using RTS/CTS */
623 info->control.alt_retry_rate_idx = -1;
625 /* Use min(data rate, max base rate) as CTS/RTS rate */
626 rate = &sband->bitrates[tx->rate_idx];
628 for (idx = 0; idx < sband->n_bitrates; idx++) {
629 if (sband->bitrates[idx].bitrate > rate->bitrate)
631 if (tx->sdata->basic_rates & BIT(idx) &&
633 (sband->bitrates[baserate].bitrate
634 < sband->bitrates[idx].bitrate)))
639 info->control.rts_cts_rate_idx = baserate;
641 info->control.rts_cts_rate_idx = 0;
645 info->control.aid = tx->sta->aid;
650 static ieee80211_tx_result
651 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
653 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
654 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
655 struct sk_buff **frags, *first, *frag;
659 int frag_threshold = tx->local->fragmentation_threshold;
661 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
665 * Warn when submitting a fragmented A-MPDU frame and drop it.
666 * This is an error and needs to be fixed elsewhere, but when
667 * done needs to take care of monitor interfaces (injection)
670 if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU ||
671 skb_get_queue_mapping(tx->skb) >=
672 ieee80211_num_regular_queues(&tx->local->hw)))
677 hdrlen = ieee80211_get_hdrlen(tx->fc);
678 payload_len = first->len - hdrlen;
679 per_fragm = frag_threshold - hdrlen - FCS_LEN;
680 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
682 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
686 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
687 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
688 pos = first->data + hdrlen + per_fragm;
689 left = payload_len - per_fragm;
690 for (i = 0; i < num_fragm - 1; i++) {
691 struct ieee80211_hdr *fhdr;
697 /* reserve enough extra head and tail room for possible
700 dev_alloc_skb(tx->local->tx_headroom +
702 IEEE80211_ENCRYPT_HEADROOM +
703 IEEE80211_ENCRYPT_TAILROOM);
706 /* Make sure that all fragments use the same priority so
707 * that they end up using the same TX queue */
708 frag->priority = first->priority;
709 skb_reserve(frag, tx->local->tx_headroom +
710 IEEE80211_ENCRYPT_HEADROOM);
711 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
712 memcpy(fhdr, first->data, hdrlen);
713 if (i == num_fragm - 2)
714 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
715 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
716 copylen = left > per_fragm ? per_fragm : left;
717 memcpy(skb_put(frag, copylen), pos, copylen);
722 skb_trim(first, hdrlen + per_fragm);
724 tx->num_extra_frag = num_fragm - 1;
725 tx->extra_frag = frags;
730 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
732 for (i = 0; i < num_fragm - 1; i++)
734 dev_kfree_skb(frags[i]);
737 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
741 static ieee80211_tx_result
742 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
747 switch (tx->key->conf.alg) {
749 return ieee80211_crypto_wep_encrypt(tx);
751 return ieee80211_crypto_tkip_encrypt(tx);
753 return ieee80211_crypto_ccmp_encrypt(tx);
761 static ieee80211_tx_result
762 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
764 struct ieee80211_local *local = tx->local;
765 struct sk_buff *skb = tx->skb;
766 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
767 u32 load = 0, hdrtime;
768 struct ieee80211_rate *rate;
769 struct ieee80211_supported_band *sband;
770 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
772 sband = tx->local->hw.wiphy->bands[tx->channel->band];
773 rate = &sband->bitrates[tx->rate_idx];
775 /* TODO: this could be part of tx_status handling, so that the number
776 * of retries would be known; TX rate should in that case be stored
777 * somewhere with the packet */
779 /* Estimate total channel use caused by this frame */
781 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
782 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
784 if (tx->channel->band == IEEE80211_BAND_5GHZ ||
785 (tx->channel->band == IEEE80211_BAND_2GHZ &&
786 rate->flags & IEEE80211_RATE_ERP_G))
787 hdrtime = CHAN_UTIL_HDR_SHORT;
789 hdrtime = CHAN_UTIL_HDR_LONG;
792 if (!is_multicast_ether_addr(hdr->addr1))
795 if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
797 else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
800 /* TODO: optimise again */
801 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
803 if (tx->extra_frag) {
805 for (i = 0; i < tx->num_extra_frag; i++) {
807 load += tx->extra_frag[i]->len *
812 /* Divide channel_use by 8 to avoid wrapping around the counter */
813 load >>= CHAN_UTIL_SHIFT;
814 local->channel_use_raw += load;
816 tx->sta->channel_use_raw += load;
817 tx->sdata->channel_use_raw += load;
820 tx->sta->tx_packets++;
821 tx->sta->tx_fragments++;
822 tx->sta->tx_bytes += tx->skb->len;
823 if (tx->extra_frag) {
825 tx->sta->tx_fragments += tx->num_extra_frag;
826 for (i = 0; i < tx->num_extra_frag; i++) {
828 tx->extra_frag[i]->len;
837 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *);
838 static ieee80211_tx_handler ieee80211_tx_handlers[] =
840 ieee80211_tx_h_check_assoc,
841 ieee80211_tx_h_sequence,
842 ieee80211_tx_h_ps_buf,
843 ieee80211_tx_h_select_key,
844 ieee80211_tx_h_michael_mic_add,
845 ieee80211_tx_h_rate_ctrl,
847 ieee80211_tx_h_fragment,
848 /* handlers after fragment must be aware of tx info fragmentation! */
849 ieee80211_tx_h_encrypt,
850 ieee80211_tx_h_stats,
854 /* actual transmit path */
857 * deal with packet injection down monitor interface
858 * with Radiotap Header -- only called for monitor mode interface
860 static ieee80211_tx_result
861 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
865 * this is the moment to interpret and discard the radiotap header that
866 * must be at the start of the packet injected in Monitor mode
868 * Need to take some care with endian-ness since radiotap
869 * args are little-endian
872 struct ieee80211_radiotap_iterator iterator;
873 struct ieee80211_radiotap_header *rthdr =
874 (struct ieee80211_radiotap_header *) skb->data;
875 struct ieee80211_supported_band *sband;
876 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
877 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
879 sband = tx->local->hw.wiphy->bands[tx->channel->band];
881 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
882 info->flags |= IEEE80211_TX_CTL_INJECTED;
883 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
886 * for every radiotap entry that is present
887 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
888 * entries present, or -EINVAL on error)
894 ret = ieee80211_radiotap_iterator_next(&iterator);
899 /* see if this argument is something we can use */
900 switch (iterator.this_arg_index) {
902 * You must take care when dereferencing iterator.this_arg
903 * for multibyte types... the pointer is not aligned. Use
904 * get_unaligned((type *)iterator.this_arg) to dereference
905 * iterator.this_arg for type "type" safely on all arches.
907 case IEEE80211_RADIOTAP_RATE:
909 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
910 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
912 target_rate = (*iterator.this_arg) * 5;
913 for (i = 0; i < sband->n_bitrates; i++) {
914 struct ieee80211_rate *r;
916 r = &sband->bitrates[i];
918 if (r->bitrate == target_rate) {
925 case IEEE80211_RADIOTAP_ANTENNA:
927 * radiotap uses 0 for 1st ant, mac80211 is 1 for
930 info->antenna_sel_tx = (*iterator.this_arg) + 1;
934 case IEEE80211_RADIOTAP_DBM_TX_POWER:
935 control->power_level = *iterator.this_arg;
939 case IEEE80211_RADIOTAP_FLAGS:
940 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
942 * this indicates that the skb we have been
943 * handed has the 32-bit FCS CRC at the end...
944 * we should react to that by snipping it off
945 * because it will be recomputed and added
948 if (skb->len < (iterator.max_length + FCS_LEN))
951 skb_trim(skb, skb->len - FCS_LEN);
953 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
955 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
956 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
957 tx->flags |= IEEE80211_TX_FRAGMENTED;
961 * Please update the file
962 * Documentation/networking/mac80211-injection.txt
963 * when parsing new fields here.
971 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
975 * remove the radiotap header
976 * iterator->max_length was sanity-checked against
977 * skb->len by iterator init
979 skb_pull(skb, iterator.max_length);
987 static ieee80211_tx_result
988 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
990 struct net_device *dev)
992 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
993 struct ieee80211_hdr *hdr;
994 struct ieee80211_sub_if_data *sdata;
995 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
999 memset(tx, 0, sizeof(*tx));
1001 tx->dev = dev; /* use original interface */
1003 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1004 tx->channel = local->hw.conf.channel;
1006 * Set this flag (used below to indicate "automatic fragmentation"),
1007 * it will be cleared/left by radiotap as desired.
1009 tx->flags |= IEEE80211_TX_FRAGMENTED;
1011 /* process and remove the injection radiotap header */
1012 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1013 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
1014 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
1018 * __ieee80211_parse_tx_radiotap has now removed
1019 * the radiotap header that was present and pre-filled
1020 * 'tx' with tx control information.
1024 hdr = (struct ieee80211_hdr *) skb->data;
1026 tx->sta = sta_info_get(local, hdr->addr1);
1027 tx->fc = le16_to_cpu(hdr->frame_control);
1029 if (is_multicast_ether_addr(hdr->addr1)) {
1030 tx->flags &= ~IEEE80211_TX_UNICAST;
1031 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1033 tx->flags |= IEEE80211_TX_UNICAST;
1034 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1037 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1038 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1039 skb->len + FCS_LEN > local->fragmentation_threshold &&
1040 !local->ops->set_frag_threshold)
1041 tx->flags |= IEEE80211_TX_FRAGMENTED;
1043 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1047 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1048 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1049 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1051 hdrlen = ieee80211_get_hdrlen(tx->fc);
1052 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1053 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1054 tx->ethertype = (pos[0] << 8) | pos[1];
1056 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1062 * NB: @tx is uninitialised when passed in here
1064 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1065 struct sk_buff *skb,
1066 struct net_device *mdev)
1068 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1069 struct net_device *dev;
1071 dev = dev_get_by_index(&init_net, info->control.ifindex);
1072 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1078 /* initialises tx with control */
1079 __ieee80211_tx_prepare(tx, skb, dev);
1084 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1085 struct ieee80211_tx_data *tx)
1087 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1090 if (netif_subqueue_stopped(local->mdev, skb))
1091 return IEEE80211_TX_AGAIN;
1094 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1095 "TX to low-level driver", skb);
1096 ret = local->ops->tx(local_to_hw(local), skb);
1098 return IEEE80211_TX_AGAIN;
1099 local->mdev->trans_start = jiffies;
1100 ieee80211_led_tx(local, 1);
1102 if (tx->extra_frag) {
1103 for (i = 0; i < tx->num_extra_frag; i++) {
1104 if (!tx->extra_frag[i])
1106 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1107 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1108 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1109 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1110 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1111 if (netif_subqueue_stopped(local->mdev,
1113 return IEEE80211_TX_FRAG_AGAIN;
1114 if (i == tx->num_extra_frag) {
1115 info->tx_rate_idx = tx->last_frag_rate_idx;
1117 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1119 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1122 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1125 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1126 "TX to low-level driver",
1128 ret = local->ops->tx(local_to_hw(local),
1131 return IEEE80211_TX_FRAG_AGAIN;
1132 local->mdev->trans_start = jiffies;
1133 ieee80211_led_tx(local, 1);
1134 tx->extra_frag[i] = NULL;
1136 kfree(tx->extra_frag);
1137 tx->extra_frag = NULL;
1139 return IEEE80211_TX_OK;
1142 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1144 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1145 struct sta_info *sta;
1146 ieee80211_tx_handler *handler;
1147 struct ieee80211_tx_data tx;
1148 ieee80211_tx_result res = TX_DROP, res_prepare;
1149 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1153 queue = skb_get_queue_mapping(skb);
1155 WARN_ON(test_bit(queue, local->queues_pending));
1157 if (unlikely(skb->len < 10)) {
1164 /* initialises tx */
1165 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1167 if (res_prepare == TX_DROP) {
1174 tx.channel = local->hw.conf.channel;
1175 info->band = tx.channel->band;
1177 for (handler = ieee80211_tx_handlers; *handler != NULL;
1179 res = (*handler)(&tx);
1180 if (res != TX_CONTINUE)
1184 if (WARN_ON(tx.skb != skb))
1187 if (unlikely(res == TX_DROP)) {
1188 I802_DEBUG_INC(local->tx_handlers_drop);
1192 if (unlikely(res == TX_QUEUED)) {
1193 I802_DEBUG_INC(local->tx_handlers_queued);
1198 if (tx.extra_frag) {
1199 for (i = 0; i < tx.num_extra_frag; i++) {
1201 struct ieee80211_hdr *hdr =
1202 (struct ieee80211_hdr *)
1203 tx.extra_frag[i]->data;
1205 if (i + 1 < tx.num_extra_frag) {
1206 next_len = tx.extra_frag[i + 1]->len;
1209 tx.rate_idx = tx.last_frag_rate_idx;
1211 dur = ieee80211_duration(&tx, 0, next_len);
1212 hdr->duration_id = cpu_to_le16(dur);
1217 ret = __ieee80211_tx(local, skb, &tx);
1219 struct ieee80211_tx_stored_packet *store;
1222 * Since there are no fragmented frames on A-MPDU
1223 * queues, there's no reason for a driver to reject
1224 * a frame there, warn and drop it.
1226 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1229 store = &local->pending_packet[queue];
1231 if (ret == IEEE80211_TX_FRAG_AGAIN)
1233 set_bit(queue, local->queues_pending);
1236 * When the driver gets out of buffers during sending of
1237 * fragments and calls ieee80211_stop_queue, the netif
1238 * subqueue is stopped. There is, however, a small window
1239 * in which the PENDING bit is not yet set. If a buffer
1240 * gets available in that window (i.e. driver calls
1241 * ieee80211_wake_queue), we would end up with ieee80211_tx
1242 * called with the PENDING bit still set. Prevent this by
1243 * continuing transmitting here when that situation is
1244 * possible to have happened.
1246 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1247 clear_bit(queue, local->queues_pending);
1251 store->extra_frag = tx.extra_frag;
1252 store->num_extra_frag = tx.num_extra_frag;
1253 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1254 store->last_frag_rate_ctrl_probe =
1255 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1263 for (i = 0; i < tx.num_extra_frag; i++)
1264 if (tx.extra_frag[i])
1265 dev_kfree_skb(tx.extra_frag[i]);
1266 kfree(tx.extra_frag);
1271 /* device xmit handlers */
1273 int ieee80211_master_start_xmit(struct sk_buff *skb,
1274 struct net_device *dev)
1276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1277 struct net_device *odev = NULL;
1278 struct ieee80211_sub_if_data *osdata;
1282 if (info->control.ifindex)
1283 odev = dev_get_by_index(&init_net, info->control.ifindex);
1284 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1288 if (unlikely(!odev)) {
1289 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1290 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1291 "originating device\n", dev->name);
1297 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1299 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1300 if (skb_headroom(skb) < headroom) {
1301 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1308 info->control.vif = &osdata->vif;
1309 ret = ieee80211_tx(odev, skb);
1315 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1316 struct net_device *dev)
1318 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1319 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1320 struct ieee80211_radiotap_header *prthdr =
1321 (struct ieee80211_radiotap_header *)skb->data;
1324 /* check for not even having the fixed radiotap header part */
1325 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1326 goto fail; /* too short to be possibly valid */
1328 /* is it a header version we can trust to find length from? */
1329 if (unlikely(prthdr->it_version))
1330 goto fail; /* only version 0 is supported */
1332 /* then there must be a radiotap header with a length we can use */
1333 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1335 /* does the skb contain enough to deliver on the alleged length? */
1336 if (unlikely(skb->len < len_rthdr))
1337 goto fail; /* skb too short for claimed rt header extent */
1339 skb->dev = local->mdev;
1341 /* needed because we set skb device to master */
1342 info->control.ifindex = dev->ifindex;
1344 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1345 /* Interfaces should always request a status report */
1346 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1349 * fix up the pointers accounting for the radiotap
1350 * header still being in there. We are being given
1351 * a precooked IEEE80211 header so no need for
1354 skb_set_mac_header(skb, len_rthdr);
1356 * these are just fixed to the end of the rt area since we
1357 * don't have any better information and at this point, nobody cares
1359 skb_set_network_header(skb, len_rthdr);
1360 skb_set_transport_header(skb, len_rthdr);
1362 /* pass the radiotap header up to the next stage intact */
1363 dev_queue_xmit(skb);
1364 return NETDEV_TX_OK;
1368 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1372 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1373 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1374 * @skb: packet to be sent
1375 * @dev: incoming interface
1377 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1378 * not be freed, and caller is responsible for either retrying later or freeing
1381 * This function takes in an Ethernet header and encapsulates it with suitable
1382 * IEEE 802.11 header based on which interface the packet is coming in. The
1383 * encapsulated packet will then be passed to master interface, wlan#.11, for
1384 * transmission (through low-level driver).
1386 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1387 struct net_device *dev)
1389 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1390 struct ieee80211_tx_info *info;
1391 struct ieee80211_sub_if_data *sdata;
1392 int ret = 1, head_need;
1393 u16 ethertype, hdrlen, meshhdrlen = 0, fc;
1394 struct ieee80211_hdr hdr;
1395 struct ieee80211s_hdr mesh_hdr;
1396 const u8 *encaps_data;
1397 int encaps_len, skip_header_bytes;
1399 struct sta_info *sta;
1402 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1403 if (unlikely(skb->len < ETH_HLEN)) {
1404 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1405 dev->name, skb->len);
1410 nh_pos = skb_network_header(skb) - skb->data;
1411 h_pos = skb_transport_header(skb) - skb->data;
1413 /* convert Ethernet header to proper 802.11 header (based on
1414 * operation mode) */
1415 ethertype = (skb->data[12] << 8) | skb->data[13];
1416 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1418 switch (sdata->vif.type) {
1419 case IEEE80211_IF_TYPE_AP:
1420 case IEEE80211_IF_TYPE_VLAN:
1421 fc |= IEEE80211_FCTL_FROMDS;
1423 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1424 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1425 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1428 case IEEE80211_IF_TYPE_WDS:
1429 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1431 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1432 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1433 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1434 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1437 #ifdef CONFIG_MAC80211_MESH
1438 case IEEE80211_IF_TYPE_MESH_POINT:
1439 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1441 if (is_multicast_ether_addr(skb->data))
1442 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1443 else if (mesh_nexthop_lookup(hdr.addr1, skb, dev))
1445 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1446 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1447 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1448 if (skb->pkt_type == PACKET_OTHERHOST) {
1449 /* Forwarded frame, keep mesh ttl and seqnum */
1450 struct ieee80211s_hdr *prev_meshhdr;
1451 prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb);
1452 meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr);
1453 memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen);
1454 sdata->u.sta.mshstats.fwded_frames++;
1456 if (!sdata->u.sta.mshcfg.dot11MeshTTL) {
1457 /* Do not send frames with mesh_ttl == 0 */
1458 sdata->u.sta.mshstats.dropped_frames_ttl++;
1462 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1468 case IEEE80211_IF_TYPE_STA:
1469 fc |= IEEE80211_FCTL_TODS;
1471 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1472 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1473 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1476 case IEEE80211_IF_TYPE_IBSS:
1478 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1479 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1480 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1489 * There's no need to try to look up the destination
1490 * if it is a multicast address (which can only happen
1493 if (!is_multicast_ether_addr(hdr.addr1)) {
1495 sta = sta_info_get(local, hdr.addr1);
1497 sta_flags = get_sta_flags(sta);
1501 /* receiver and we are QoS enabled, use a QoS type frame */
1502 if (sta_flags & WLAN_STA_WME &&
1503 ieee80211_num_regular_queues(&local->hw) >= 4) {
1504 fc |= IEEE80211_STYPE_QOS_DATA;
1509 * Drop unicast frames to unauthorised stations unless they are
1510 * EAPOL frames from the local station.
1512 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1513 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1514 !(ethertype == ETH_P_PAE &&
1515 compare_ether_addr(dev->dev_addr,
1516 skb->data + ETH_ALEN) == 0))) {
1517 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1518 DECLARE_MAC_BUF(mac);
1520 if (net_ratelimit())
1521 printk(KERN_DEBUG "%s: dropped frame to %s"
1522 " (unauthorized port)\n", dev->name,
1523 print_mac(mac, hdr.addr1));
1526 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1532 hdr.frame_control = cpu_to_le16(fc);
1533 hdr.duration_id = 0;
1536 skip_header_bytes = ETH_HLEN;
1537 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1538 encaps_data = bridge_tunnel_header;
1539 encaps_len = sizeof(bridge_tunnel_header);
1540 skip_header_bytes -= 2;
1541 } else if (ethertype >= 0x600) {
1542 encaps_data = rfc1042_header;
1543 encaps_len = sizeof(rfc1042_header);
1544 skip_header_bytes -= 2;
1550 skb_pull(skb, skip_header_bytes);
1551 nh_pos -= skip_header_bytes;
1552 h_pos -= skip_header_bytes;
1554 /* TODO: implement support for fragments so that there is no need to
1555 * reallocate and copy payload; it might be enough to support one
1556 * extra fragment that would be copied in the beginning of the frame
1557 * data.. anyway, it would be nice to include this into skb structure
1560 * There are few options for this:
1561 * use skb->cb as an extra space for 802.11 header
1562 * allocate new buffer if not enough headroom
1563 * make sure that there is enough headroom in every skb by increasing
1564 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1565 * alloc_skb() (net/core/skbuff.c)
1567 head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom;
1568 head_need -= skb_headroom(skb);
1570 /* We are going to modify skb data, so make a copy of it if happens to
1571 * be cloned. This could happen, e.g., with Linux bridge code passing
1572 * us broadcast frames. */
1574 if (head_need > 0 || skb_header_cloned(skb)) {
1576 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1577 "of headroom\n", dev->name, head_need);
1580 if (skb_header_cloned(skb))
1581 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1583 I802_DEBUG_INC(local->tx_expand_skb_head);
1584 /* Since we have to reallocate the buffer, make sure that there
1585 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1586 * before payload and 12 after). */
1587 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1589 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1596 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1597 nh_pos += encaps_len;
1598 h_pos += encaps_len;
1601 if (meshhdrlen > 0) {
1602 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1603 nh_pos += meshhdrlen;
1604 h_pos += meshhdrlen;
1607 if (fc & IEEE80211_STYPE_QOS_DATA) {
1608 __le16 *qos_control;
1610 qos_control = (__le16*) skb_push(skb, 2);
1611 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1613 * Maybe we could actually set some fields here, for now just
1614 * initialise to zero to indicate no special operation.
1618 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1623 info = IEEE80211_SKB_CB(skb);
1624 memset(info, 0, sizeof(*info));
1625 info->control.ifindex = dev->ifindex;
1626 if (ethertype == ETH_P_PAE)
1627 info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME;
1629 /* Interfaces should always request a status report */
1630 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1632 skb->dev = local->mdev;
1633 dev->stats.tx_packets++;
1634 dev->stats.tx_bytes += skb->len;
1636 /* Update skb pointers to various headers since this modified frame
1637 * is going to go through Linux networking code that may potentially
1638 * need things like pointer to IP header. */
1639 skb_set_mac_header(skb, 0);
1640 skb_set_network_header(skb, nh_pos);
1641 skb_set_transport_header(skb, h_pos);
1643 dev->trans_start = jiffies;
1644 dev_queue_xmit(skb);
1657 * ieee80211_clear_tx_pending may not be called in a context where
1658 * it is possible that it packets could come in again.
1660 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1663 struct ieee80211_tx_stored_packet *store;
1665 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1666 if (!test_bit(i, local->queues_pending))
1668 store = &local->pending_packet[i];
1669 kfree_skb(store->skb);
1670 for (j = 0; j < store->num_extra_frag; j++)
1671 kfree_skb(store->extra_frag[j]);
1672 kfree(store->extra_frag);
1673 clear_bit(i, local->queues_pending);
1678 * Transmit all pending packets. Called from tasklet, locks master device
1679 * TX lock so that no new packets can come in.
1681 void ieee80211_tx_pending(unsigned long data)
1683 struct ieee80211_local *local = (struct ieee80211_local *)data;
1684 struct net_device *dev = local->mdev;
1685 struct ieee80211_tx_stored_packet *store;
1686 struct ieee80211_tx_data tx;
1689 netif_tx_lock_bh(dev);
1690 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1691 /* Check that this queue is ok */
1692 if (__netif_subqueue_stopped(local->mdev, i))
1695 if (!test_bit(i, local->queues_pending)) {
1696 ieee80211_wake_queue(&local->hw, i);
1700 store = &local->pending_packet[i];
1701 tx.extra_frag = store->extra_frag;
1702 tx.num_extra_frag = store->num_extra_frag;
1703 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1705 if (store->last_frag_rate_ctrl_probe)
1706 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1707 ret = __ieee80211_tx(local, store->skb, &tx);
1709 if (ret == IEEE80211_TX_FRAG_AGAIN)
1712 clear_bit(i, local->queues_pending);
1713 ieee80211_wake_queue(&local->hw, i);
1716 netif_tx_unlock_bh(dev);
1719 /* functions for drivers to get certain frames */
1721 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1722 struct ieee80211_if_ap *bss,
1723 struct sk_buff *skb,
1724 struct beacon_data *beacon)
1728 int i, have_bits = 0, n1, n2;
1730 /* Generate bitmap for TIM only if there are any STAs in power save
1732 if (atomic_read(&bss->num_sta_ps) > 0)
1733 /* in the hope that this is faster than
1734 * checking byte-for-byte */
1735 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1736 IEEE80211_MAX_AID+1);
1738 if (bss->dtim_count == 0)
1739 bss->dtim_count = beacon->dtim_period - 1;
1743 tim = pos = (u8 *) skb_put(skb, 6);
1744 *pos++ = WLAN_EID_TIM;
1746 *pos++ = bss->dtim_count;
1747 *pos++ = beacon->dtim_period;
1749 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1753 /* Find largest even number N1 so that bits numbered 1 through
1754 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1755 * (N2 + 1) x 8 through 2007 are 0. */
1757 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1764 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1771 /* Bitmap control */
1773 /* Part Virt Bitmap */
1774 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1776 tim[1] = n2 - n1 + 4;
1777 skb_put(skb, n2 - n1);
1779 *pos++ = aid0; /* Bitmap control */
1780 *pos++ = 0; /* Part Virt Bitmap */
1784 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1785 struct ieee80211_vif *vif)
1787 struct ieee80211_local *local = hw_to_local(hw);
1788 struct sk_buff *skb;
1789 struct ieee80211_tx_info *info;
1790 struct net_device *bdev;
1791 struct ieee80211_sub_if_data *sdata = NULL;
1792 struct ieee80211_if_ap *ap = NULL;
1793 struct rate_selection rsel;
1794 struct beacon_data *beacon;
1795 struct ieee80211_supported_band *sband;
1796 struct ieee80211_mgmt *mgmt;
1799 enum ieee80211_band band = local->hw.conf.channel->band;
1802 sband = local->hw.wiphy->bands[band];
1806 sdata = vif_to_sdata(vif);
1809 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1811 beacon = rcu_dereference(ap->beacon);
1814 * headroom, head length,
1815 * tail length and maximum TIM length
1817 skb = dev_alloc_skb(local->tx_headroom +
1819 beacon->tail_len + 256);
1823 skb_reserve(skb, local->tx_headroom);
1824 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1827 ieee80211_include_sequence(sdata,
1828 (struct ieee80211_hdr *)skb->data);
1831 * Not very nice, but we want to allow the driver to call
1832 * ieee80211_beacon_get() as a response to the set_tim()
1833 * callback. That, however, is already invoked under the
1834 * sta_lock to guarantee consistent and race-free update
1835 * of the tim bitmap in mac80211 and the driver.
1837 if (local->tim_in_locked_section) {
1838 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1840 unsigned long flags;
1842 spin_lock_irqsave(&local->sta_lock, flags);
1843 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1844 spin_unlock_irqrestore(&local->sta_lock, flags);
1848 memcpy(skb_put(skb, beacon->tail_len),
1849 beacon->tail, beacon->tail_len);
1851 num_beacons = &ap->num_beacons;
1855 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1856 /* headroom, head length, tail length and maximum TIM length */
1857 skb = dev_alloc_skb(local->tx_headroom + 400);
1861 skb_reserve(skb, local->hw.extra_tx_headroom);
1862 mgmt = (struct ieee80211_mgmt *)
1863 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1864 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1865 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1866 IEEE80211_STYPE_BEACON);
1867 memset(mgmt->da, 0xff, ETH_ALEN);
1868 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1869 /* BSSID is left zeroed, wildcard value */
1870 mgmt->u.beacon.beacon_int =
1871 cpu_to_le16(local->hw.conf.beacon_int);
1872 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1874 pos = skb_put(skb, 2);
1875 *pos++ = WLAN_EID_SSID;
1878 mesh_mgmt_ies_add(skb, sdata->dev);
1880 num_beacons = &sdata->u.sta.num_beacons;
1886 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1887 if (net_ratelimit())
1888 printk(KERN_DEBUG "no beacon data avail for %s\n",
1890 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1895 info = IEEE80211_SKB_CB(skb);
1898 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1900 if (unlikely(rsel.rate_idx < 0)) {
1901 if (net_ratelimit()) {
1902 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1904 wiphy_name(local->hw.wiphy));
1911 info->control.vif = vif;
1912 info->tx_rate_idx = rsel.rate_idx;
1913 if (sdata->bss_conf.use_short_preamble &&
1914 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1915 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1916 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1917 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1918 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1919 info->control.retry_limit = 1;
1920 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1926 EXPORT_SYMBOL(ieee80211_beacon_get);
1928 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1929 const void *frame, size_t frame_len,
1930 const struct ieee80211_tx_info *frame_txctl,
1931 struct ieee80211_rts *rts)
1933 const struct ieee80211_hdr *hdr = frame;
1936 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1937 rts->frame_control = cpu_to_le16(fctl);
1938 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1940 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1941 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1943 EXPORT_SYMBOL(ieee80211_rts_get);
1945 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1946 const void *frame, size_t frame_len,
1947 const struct ieee80211_tx_info *frame_txctl,
1948 struct ieee80211_cts *cts)
1950 const struct ieee80211_hdr *hdr = frame;
1953 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1954 cts->frame_control = cpu_to_le16(fctl);
1955 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1956 frame_len, frame_txctl);
1957 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1959 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1962 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1963 struct ieee80211_vif *vif)
1965 struct ieee80211_local *local = hw_to_local(hw);
1966 struct sk_buff *skb;
1967 struct sta_info *sta;
1968 ieee80211_tx_handler *handler;
1969 struct ieee80211_tx_data tx;
1970 ieee80211_tx_result res = TX_DROP;
1971 struct net_device *bdev;
1972 struct ieee80211_sub_if_data *sdata;
1973 struct ieee80211_if_ap *bss = NULL;
1974 struct beacon_data *beacon;
1975 struct ieee80211_tx_info *info;
1977 sdata = vif_to_sdata(vif);
1985 beacon = rcu_dereference(bss->beacon);
1987 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1993 if (bss->dtim_count != 0)
1994 return NULL; /* send buffered bc/mc only after DTIM beacon */
1997 skb = skb_dequeue(&bss->ps_bc_buf);
2000 local->total_ps_buffered--;
2002 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2003 struct ieee80211_hdr *hdr =
2004 (struct ieee80211_hdr *) skb->data;
2005 /* more buffered multicast/broadcast frames ==> set
2006 * MoreData flag in IEEE 802.11 header to inform PS
2008 hdr->frame_control |=
2009 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2012 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
2014 dev_kfree_skb_any(skb);
2017 info = IEEE80211_SKB_CB(skb);
2020 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2021 tx.channel = local->hw.conf.channel;
2022 info->band = tx.channel->band;
2024 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
2025 res = (*handler)(&tx);
2026 if (res == TX_DROP || res == TX_QUEUED)
2030 if (WARN_ON(tx.skb != skb))
2033 if (res == TX_DROP) {
2034 I802_DEBUG_INC(local->tx_handlers_drop);
2037 } else if (res == TX_QUEUED) {
2038 I802_DEBUG_INC(local->tx_handlers_queued);
2046 EXPORT_SYMBOL(ieee80211_get_buffered_bc);