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)
769 tx->sta->tx_packets++;
770 tx->sta->tx_fragments++;
771 tx->sta->tx_bytes += tx->skb->len;
772 if (tx->extra_frag) {
773 tx->sta->tx_fragments += tx->num_extra_frag;
774 for (i = 0; i < tx->num_extra_frag; i++)
775 tx->sta->tx_bytes += tx->extra_frag[i]->len;
782 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *);
783 static ieee80211_tx_handler ieee80211_tx_handlers[] =
785 ieee80211_tx_h_check_assoc,
786 ieee80211_tx_h_sequence,
787 ieee80211_tx_h_ps_buf,
788 ieee80211_tx_h_select_key,
789 ieee80211_tx_h_michael_mic_add,
790 ieee80211_tx_h_rate_ctrl,
792 ieee80211_tx_h_fragment,
793 /* handlers after fragment must be aware of tx info fragmentation! */
794 ieee80211_tx_h_encrypt,
795 ieee80211_tx_h_stats,
799 /* actual transmit path */
802 * deal with packet injection down monitor interface
803 * with Radiotap Header -- only called for monitor mode interface
805 static ieee80211_tx_result
806 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
810 * this is the moment to interpret and discard the radiotap header that
811 * must be at the start of the packet injected in Monitor mode
813 * Need to take some care with endian-ness since radiotap
814 * args are little-endian
817 struct ieee80211_radiotap_iterator iterator;
818 struct ieee80211_radiotap_header *rthdr =
819 (struct ieee80211_radiotap_header *) skb->data;
820 struct ieee80211_supported_band *sband;
821 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
822 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
824 sband = tx->local->hw.wiphy->bands[tx->channel->band];
826 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
827 info->flags |= IEEE80211_TX_CTL_INJECTED;
828 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
831 * for every radiotap entry that is present
832 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
833 * entries present, or -EINVAL on error)
839 ret = ieee80211_radiotap_iterator_next(&iterator);
844 /* see if this argument is something we can use */
845 switch (iterator.this_arg_index) {
847 * You must take care when dereferencing iterator.this_arg
848 * for multibyte types... the pointer is not aligned. Use
849 * get_unaligned((type *)iterator.this_arg) to dereference
850 * iterator.this_arg for type "type" safely on all arches.
852 case IEEE80211_RADIOTAP_RATE:
854 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
855 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
857 target_rate = (*iterator.this_arg) * 5;
858 for (i = 0; i < sband->n_bitrates; i++) {
859 struct ieee80211_rate *r;
861 r = &sband->bitrates[i];
863 if (r->bitrate == target_rate) {
870 case IEEE80211_RADIOTAP_ANTENNA:
872 * radiotap uses 0 for 1st ant, mac80211 is 1 for
875 info->antenna_sel_tx = (*iterator.this_arg) + 1;
879 case IEEE80211_RADIOTAP_DBM_TX_POWER:
880 control->power_level = *iterator.this_arg;
884 case IEEE80211_RADIOTAP_FLAGS:
885 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
887 * this indicates that the skb we have been
888 * handed has the 32-bit FCS CRC at the end...
889 * we should react to that by snipping it off
890 * because it will be recomputed and added
893 if (skb->len < (iterator.max_length + FCS_LEN))
896 skb_trim(skb, skb->len - FCS_LEN);
898 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
900 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
901 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
902 tx->flags |= IEEE80211_TX_FRAGMENTED;
906 * Please update the file
907 * Documentation/networking/mac80211-injection.txt
908 * when parsing new fields here.
916 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
920 * remove the radiotap header
921 * iterator->max_length was sanity-checked against
922 * skb->len by iterator init
924 skb_pull(skb, iterator.max_length);
932 static ieee80211_tx_result
933 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
935 struct net_device *dev)
937 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
938 struct ieee80211_hdr *hdr;
939 struct ieee80211_sub_if_data *sdata;
940 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
944 memset(tx, 0, sizeof(*tx));
946 tx->dev = dev; /* use original interface */
948 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
949 tx->channel = local->hw.conf.channel;
951 tx->last_frag_rate_idx = -1;
953 * Set this flag (used below to indicate "automatic fragmentation"),
954 * it will be cleared/left by radiotap as desired.
956 tx->flags |= IEEE80211_TX_FRAGMENTED;
958 /* process and remove the injection radiotap header */
959 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
960 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
961 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
965 * __ieee80211_parse_tx_radiotap has now removed
966 * the radiotap header that was present and pre-filled
967 * 'tx' with tx control information.
971 hdr = (struct ieee80211_hdr *) skb->data;
973 tx->sta = sta_info_get(local, hdr->addr1);
974 tx->fc = le16_to_cpu(hdr->frame_control);
976 if (is_multicast_ether_addr(hdr->addr1)) {
977 tx->flags &= ~IEEE80211_TX_UNICAST;
978 info->flags |= IEEE80211_TX_CTL_NO_ACK;
980 tx->flags |= IEEE80211_TX_UNICAST;
981 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
984 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
985 if ((tx->flags & IEEE80211_TX_UNICAST) &&
986 skb->len + FCS_LEN > local->fragmentation_threshold &&
987 !local->ops->set_frag_threshold)
988 tx->flags |= IEEE80211_TX_FRAGMENTED;
990 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
994 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
995 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
996 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
998 hdrlen = ieee80211_get_hdrlen(tx->fc);
999 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1000 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1001 tx->ethertype = (pos[0] << 8) | pos[1];
1003 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1009 * NB: @tx is uninitialised when passed in here
1011 static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1012 struct sk_buff *skb,
1013 struct net_device *mdev)
1015 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1016 struct net_device *dev;
1018 dev = dev_get_by_index(&init_net, info->control.ifindex);
1019 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1025 /* initialises tx with control */
1026 __ieee80211_tx_prepare(tx, skb, dev);
1031 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1032 struct ieee80211_tx_data *tx)
1034 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1037 if (netif_subqueue_stopped(local->mdev, skb))
1038 return IEEE80211_TX_AGAIN;
1041 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1042 "TX to low-level driver", skb);
1043 ret = local->ops->tx(local_to_hw(local), skb);
1045 return IEEE80211_TX_AGAIN;
1046 local->mdev->trans_start = jiffies;
1047 ieee80211_led_tx(local, 1);
1049 if (tx->extra_frag) {
1050 for (i = 0; i < tx->num_extra_frag; i++) {
1051 if (!tx->extra_frag[i])
1053 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1054 info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS |
1055 IEEE80211_TX_CTL_USE_CTS_PROTECT |
1056 IEEE80211_TX_CTL_CLEAR_PS_FILT |
1057 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1058 if (netif_subqueue_stopped(local->mdev,
1060 return IEEE80211_TX_FRAG_AGAIN;
1061 if (i == tx->num_extra_frag) {
1062 info->tx_rate_idx = tx->last_frag_rate_idx;
1064 if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG)
1066 IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1069 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1072 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1073 "TX to low-level driver",
1075 ret = local->ops->tx(local_to_hw(local),
1078 return IEEE80211_TX_FRAG_AGAIN;
1079 local->mdev->trans_start = jiffies;
1080 ieee80211_led_tx(local, 1);
1081 tx->extra_frag[i] = NULL;
1083 kfree(tx->extra_frag);
1084 tx->extra_frag = NULL;
1086 return IEEE80211_TX_OK;
1089 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1091 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1092 struct sta_info *sta;
1093 ieee80211_tx_handler *handler;
1094 struct ieee80211_tx_data tx;
1095 ieee80211_tx_result res = TX_DROP, res_prepare;
1096 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1100 queue = skb_get_queue_mapping(skb);
1102 WARN_ON(test_bit(queue, local->queues_pending));
1104 if (unlikely(skb->len < 10)) {
1111 /* initialises tx */
1112 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1114 if (res_prepare == TX_DROP) {
1121 tx.channel = local->hw.conf.channel;
1122 info->band = tx.channel->band;
1124 for (handler = ieee80211_tx_handlers; *handler != NULL;
1126 res = (*handler)(&tx);
1127 if (res != TX_CONTINUE)
1131 if (WARN_ON(tx.skb != skb))
1134 if (unlikely(res == TX_DROP)) {
1135 I802_DEBUG_INC(local->tx_handlers_drop);
1139 if (unlikely(res == TX_QUEUED)) {
1140 I802_DEBUG_INC(local->tx_handlers_queued);
1145 if (tx.extra_frag) {
1146 for (i = 0; i < tx.num_extra_frag; i++) {
1148 struct ieee80211_hdr *hdr =
1149 (struct ieee80211_hdr *)
1150 tx.extra_frag[i]->data;
1152 if (i + 1 < tx.num_extra_frag) {
1153 next_len = tx.extra_frag[i + 1]->len;
1156 tx.rate_idx = tx.last_frag_rate_idx;
1158 dur = ieee80211_duration(&tx, 0, next_len);
1159 hdr->duration_id = cpu_to_le16(dur);
1164 ret = __ieee80211_tx(local, skb, &tx);
1166 struct ieee80211_tx_stored_packet *store;
1169 * Since there are no fragmented frames on A-MPDU
1170 * queues, there's no reason for a driver to reject
1171 * a frame there, warn and drop it.
1173 if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw)))
1176 store = &local->pending_packet[queue];
1178 if (ret == IEEE80211_TX_FRAG_AGAIN)
1180 set_bit(queue, local->queues_pending);
1183 * When the driver gets out of buffers during sending of
1184 * fragments and calls ieee80211_stop_queue, the netif
1185 * subqueue is stopped. There is, however, a small window
1186 * in which the PENDING bit is not yet set. If a buffer
1187 * gets available in that window (i.e. driver calls
1188 * ieee80211_wake_queue), we would end up with ieee80211_tx
1189 * called with the PENDING bit still set. Prevent this by
1190 * continuing transmitting here when that situation is
1191 * possible to have happened.
1193 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1194 clear_bit(queue, local->queues_pending);
1198 store->extra_frag = tx.extra_frag;
1199 store->num_extra_frag = tx.num_extra_frag;
1200 store->last_frag_rate_idx = tx.last_frag_rate_idx;
1201 store->last_frag_rate_ctrl_probe =
1202 !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG);
1210 for (i = 0; i < tx.num_extra_frag; i++)
1211 if (tx.extra_frag[i])
1212 dev_kfree_skb(tx.extra_frag[i]);
1213 kfree(tx.extra_frag);
1218 /* device xmit handlers */
1220 static int ieee80211_skb_resize(struct ieee80211_local *local,
1221 struct sk_buff *skb,
1222 int head_need, bool may_encrypt)
1227 * This could be optimised, devices that do full hardware
1228 * crypto (including TKIP MMIC) need no tailroom... But we
1229 * have no drivers for such devices currently.
1232 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1233 tail_need -= skb_tailroom(skb);
1234 tail_need = max_t(int, tail_need, 0);
1237 if (head_need || tail_need) {
1238 /* Sorry. Can't account for this any more */
1242 if (skb_header_cloned(skb))
1243 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1245 I802_DEBUG_INC(local->tx_expand_skb_head);
1247 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1248 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1249 wiphy_name(local->hw.wiphy));
1253 /* update truesize too */
1254 skb->truesize += head_need + tail_need;
1259 int ieee80211_master_start_xmit(struct sk_buff *skb,
1260 struct net_device *dev)
1262 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1263 struct net_device *odev = NULL;
1264 struct ieee80211_sub_if_data *osdata;
1269 if (info->control.ifindex)
1270 odev = dev_get_by_index(&init_net, info->control.ifindex);
1271 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1275 if (unlikely(!odev)) {
1276 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1277 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1278 "originating device\n", dev->name);
1284 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1286 may_encrypt = !(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT);
1288 headroom = osdata->local->tx_headroom;
1290 headroom += IEEE80211_ENCRYPT_HEADROOM;
1291 headroom -= skb_headroom(skb);
1292 headroom = max_t(int, 0, headroom);
1294 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1300 info->control.vif = &osdata->vif;
1301 ret = ieee80211_tx(odev, skb);
1307 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1308 struct net_device *dev)
1310 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1311 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1312 struct ieee80211_radiotap_header *prthdr =
1313 (struct ieee80211_radiotap_header *)skb->data;
1316 /* check for not even having the fixed radiotap header part */
1317 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1318 goto fail; /* too short to be possibly valid */
1320 /* is it a header version we can trust to find length from? */
1321 if (unlikely(prthdr->it_version))
1322 goto fail; /* only version 0 is supported */
1324 /* then there must be a radiotap header with a length we can use */
1325 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1327 /* does the skb contain enough to deliver on the alleged length? */
1328 if (unlikely(skb->len < len_rthdr))
1329 goto fail; /* skb too short for claimed rt header extent */
1331 skb->dev = local->mdev;
1333 /* needed because we set skb device to master */
1334 info->control.ifindex = dev->ifindex;
1336 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1337 /* Interfaces should always request a status report */
1338 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1341 * fix up the pointers accounting for the radiotap
1342 * header still being in there. We are being given
1343 * a precooked IEEE80211 header so no need for
1346 skb_set_mac_header(skb, len_rthdr);
1348 * these are just fixed to the end of the rt area since we
1349 * don't have any better information and at this point, nobody cares
1351 skb_set_network_header(skb, len_rthdr);
1352 skb_set_transport_header(skb, len_rthdr);
1354 /* pass the radiotap header up to the next stage intact */
1355 dev_queue_xmit(skb);
1356 return NETDEV_TX_OK;
1360 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1364 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1365 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1366 * @skb: packet to be sent
1367 * @dev: incoming interface
1369 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1370 * not be freed, and caller is responsible for either retrying later or freeing
1373 * This function takes in an Ethernet header and encapsulates it with suitable
1374 * IEEE 802.11 header based on which interface the packet is coming in. The
1375 * encapsulated packet will then be passed to master interface, wlan#.11, for
1376 * transmission (through low-level driver).
1378 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1379 struct net_device *dev)
1381 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1382 struct ieee80211_tx_info *info;
1383 struct ieee80211_sub_if_data *sdata;
1384 int ret = 1, head_need;
1385 u16 ethertype, hdrlen, meshhdrlen = 0, fc;
1386 struct ieee80211_hdr hdr;
1387 struct ieee80211s_hdr mesh_hdr;
1388 const u8 *encaps_data;
1389 int encaps_len, skip_header_bytes;
1391 struct sta_info *sta;
1394 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1395 if (unlikely(skb->len < ETH_HLEN)) {
1396 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1397 dev->name, skb->len);
1402 nh_pos = skb_network_header(skb) - skb->data;
1403 h_pos = skb_transport_header(skb) - skb->data;
1405 /* convert Ethernet header to proper 802.11 header (based on
1406 * operation mode) */
1407 ethertype = (skb->data[12] << 8) | skb->data[13];
1408 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1410 switch (sdata->vif.type) {
1411 case IEEE80211_IF_TYPE_AP:
1412 case IEEE80211_IF_TYPE_VLAN:
1413 fc |= IEEE80211_FCTL_FROMDS;
1415 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1416 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1417 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1420 case IEEE80211_IF_TYPE_WDS:
1421 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1423 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1424 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1425 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1426 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1429 #ifdef CONFIG_MAC80211_MESH
1430 case IEEE80211_IF_TYPE_MESH_POINT:
1431 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1433 if (is_multicast_ether_addr(skb->data))
1434 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1435 else if (mesh_nexthop_lookup(hdr.addr1, skb, dev))
1437 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1438 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1439 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1440 if (skb->pkt_type == PACKET_OTHERHOST) {
1441 /* Forwarded frame, keep mesh ttl and seqnum */
1442 struct ieee80211s_hdr *prev_meshhdr;
1443 prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb);
1444 meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr);
1445 memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen);
1446 sdata->u.sta.mshstats.fwded_frames++;
1448 if (!sdata->u.sta.mshcfg.dot11MeshTTL) {
1449 /* Do not send frames with mesh_ttl == 0 */
1450 sdata->u.sta.mshstats.dropped_frames_ttl++;
1454 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1460 case IEEE80211_IF_TYPE_STA:
1461 fc |= IEEE80211_FCTL_TODS;
1463 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1464 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1465 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1468 case IEEE80211_IF_TYPE_IBSS:
1470 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1471 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1472 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1481 * There's no need to try to look up the destination
1482 * if it is a multicast address (which can only happen
1485 if (!is_multicast_ether_addr(hdr.addr1)) {
1487 sta = sta_info_get(local, hdr.addr1);
1489 sta_flags = get_sta_flags(sta);
1493 /* receiver and we are QoS enabled, use a QoS type frame */
1494 if (sta_flags & WLAN_STA_WME &&
1495 ieee80211_num_regular_queues(&local->hw) >= 4) {
1496 fc |= IEEE80211_STYPE_QOS_DATA;
1501 * Drop unicast frames to unauthorised stations unless they are
1502 * EAPOL frames from the local station.
1504 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1505 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1506 !(ethertype == ETH_P_PAE &&
1507 compare_ether_addr(dev->dev_addr,
1508 skb->data + ETH_ALEN) == 0))) {
1509 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1510 DECLARE_MAC_BUF(mac);
1512 if (net_ratelimit())
1513 printk(KERN_DEBUG "%s: dropped frame to %s"
1514 " (unauthorized port)\n", dev->name,
1515 print_mac(mac, hdr.addr1));
1518 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1524 hdr.frame_control = cpu_to_le16(fc);
1525 hdr.duration_id = 0;
1528 skip_header_bytes = ETH_HLEN;
1529 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1530 encaps_data = bridge_tunnel_header;
1531 encaps_len = sizeof(bridge_tunnel_header);
1532 skip_header_bytes -= 2;
1533 } else if (ethertype >= 0x600) {
1534 encaps_data = rfc1042_header;
1535 encaps_len = sizeof(rfc1042_header);
1536 skip_header_bytes -= 2;
1542 skb_pull(skb, skip_header_bytes);
1543 nh_pos -= skip_header_bytes;
1544 h_pos -= skip_header_bytes;
1546 /* TODO: implement support for fragments so that there is no need to
1547 * reallocate and copy payload; it might be enough to support one
1548 * extra fragment that would be copied in the beginning of the frame
1549 * data.. anyway, it would be nice to include this into skb structure
1552 * There are few options for this:
1553 * use skb->cb as an extra space for 802.11 header
1554 * allocate new buffer if not enough headroom
1555 * make sure that there is enough headroom in every skb by increasing
1556 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1557 * alloc_skb() (net/core/skbuff.c)
1559 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1562 * So we need to modify the skb header and hence need a copy of
1563 * that. The head_need variable above doesn't, so far, include
1564 * the needed header space that we don't need right away. If we
1565 * can, then we don't reallocate right now but only after the
1566 * frame arrives at the master device (if it does...)
1568 * If we cannot, however, then we will reallocate to include all
1569 * the ever needed space. Also, if we need to reallocate it anyway,
1570 * make it big enough for everything we may ever need.
1573 if (head_need > 0 || skb_header_cloned(skb)) {
1574 head_need += IEEE80211_ENCRYPT_HEADROOM;
1575 head_need += local->tx_headroom;
1576 head_need = max_t(int, 0, head_need);
1577 if (ieee80211_skb_resize(local, skb, head_need, true))
1582 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1583 nh_pos += encaps_len;
1584 h_pos += encaps_len;
1587 if (meshhdrlen > 0) {
1588 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1589 nh_pos += meshhdrlen;
1590 h_pos += meshhdrlen;
1593 if (fc & IEEE80211_STYPE_QOS_DATA) {
1594 __le16 *qos_control;
1596 qos_control = (__le16*) skb_push(skb, 2);
1597 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1599 * Maybe we could actually set some fields here, for now just
1600 * initialise to zero to indicate no special operation.
1604 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1609 info = IEEE80211_SKB_CB(skb);
1610 memset(info, 0, sizeof(*info));
1611 info->control.ifindex = dev->ifindex;
1612 if (ethertype == ETH_P_PAE)
1613 info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME;
1615 /* Interfaces should always request a status report */
1616 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1618 skb->dev = local->mdev;
1619 dev->stats.tx_packets++;
1620 dev->stats.tx_bytes += skb->len;
1622 /* Update skb pointers to various headers since this modified frame
1623 * is going to go through Linux networking code that may potentially
1624 * need things like pointer to IP header. */
1625 skb_set_mac_header(skb, 0);
1626 skb_set_network_header(skb, nh_pos);
1627 skb_set_transport_header(skb, h_pos);
1629 dev->trans_start = jiffies;
1630 dev_queue_xmit(skb);
1643 * ieee80211_clear_tx_pending may not be called in a context where
1644 * it is possible that it packets could come in again.
1646 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1649 struct ieee80211_tx_stored_packet *store;
1651 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1652 if (!test_bit(i, local->queues_pending))
1654 store = &local->pending_packet[i];
1655 kfree_skb(store->skb);
1656 for (j = 0; j < store->num_extra_frag; j++)
1657 kfree_skb(store->extra_frag[j]);
1658 kfree(store->extra_frag);
1659 clear_bit(i, local->queues_pending);
1664 * Transmit all pending packets. Called from tasklet, locks master device
1665 * TX lock so that no new packets can come in.
1667 void ieee80211_tx_pending(unsigned long data)
1669 struct ieee80211_local *local = (struct ieee80211_local *)data;
1670 struct net_device *dev = local->mdev;
1671 struct ieee80211_tx_stored_packet *store;
1672 struct ieee80211_tx_data tx;
1675 netif_tx_lock_bh(dev);
1676 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1677 /* Check that this queue is ok */
1678 if (__netif_subqueue_stopped(local->mdev, i))
1681 if (!test_bit(i, local->queues_pending)) {
1682 ieee80211_wake_queue(&local->hw, i);
1686 store = &local->pending_packet[i];
1687 tx.extra_frag = store->extra_frag;
1688 tx.num_extra_frag = store->num_extra_frag;
1689 tx.last_frag_rate_idx = store->last_frag_rate_idx;
1691 if (store->last_frag_rate_ctrl_probe)
1692 tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG;
1693 ret = __ieee80211_tx(local, store->skb, &tx);
1695 if (ret == IEEE80211_TX_FRAG_AGAIN)
1698 clear_bit(i, local->queues_pending);
1699 ieee80211_wake_queue(&local->hw, i);
1702 netif_tx_unlock_bh(dev);
1705 /* functions for drivers to get certain frames */
1707 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1708 struct ieee80211_if_ap *bss,
1709 struct sk_buff *skb,
1710 struct beacon_data *beacon)
1714 int i, have_bits = 0, n1, n2;
1716 /* Generate bitmap for TIM only if there are any STAs in power save
1718 if (atomic_read(&bss->num_sta_ps) > 0)
1719 /* in the hope that this is faster than
1720 * checking byte-for-byte */
1721 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1722 IEEE80211_MAX_AID+1);
1724 if (bss->dtim_count == 0)
1725 bss->dtim_count = beacon->dtim_period - 1;
1729 tim = pos = (u8 *) skb_put(skb, 6);
1730 *pos++ = WLAN_EID_TIM;
1732 *pos++ = bss->dtim_count;
1733 *pos++ = beacon->dtim_period;
1735 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1739 /* Find largest even number N1 so that bits numbered 1 through
1740 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1741 * (N2 + 1) x 8 through 2007 are 0. */
1743 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1750 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1757 /* Bitmap control */
1759 /* Part Virt Bitmap */
1760 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1762 tim[1] = n2 - n1 + 4;
1763 skb_put(skb, n2 - n1);
1765 *pos++ = aid0; /* Bitmap control */
1766 *pos++ = 0; /* Part Virt Bitmap */
1770 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1771 struct ieee80211_vif *vif)
1773 struct ieee80211_local *local = hw_to_local(hw);
1774 struct sk_buff *skb;
1775 struct ieee80211_tx_info *info;
1776 struct net_device *bdev;
1777 struct ieee80211_sub_if_data *sdata = NULL;
1778 struct ieee80211_if_ap *ap = NULL;
1779 struct rate_selection rsel;
1780 struct beacon_data *beacon;
1781 struct ieee80211_supported_band *sband;
1782 struct ieee80211_mgmt *mgmt;
1785 enum ieee80211_band band = local->hw.conf.channel->band;
1788 sband = local->hw.wiphy->bands[band];
1792 sdata = vif_to_sdata(vif);
1795 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1797 beacon = rcu_dereference(ap->beacon);
1800 * headroom, head length,
1801 * tail length and maximum TIM length
1803 skb = dev_alloc_skb(local->tx_headroom +
1805 beacon->tail_len + 256);
1809 skb_reserve(skb, local->tx_headroom);
1810 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1813 ieee80211_include_sequence(sdata,
1814 (struct ieee80211_hdr *)skb->data);
1817 * Not very nice, but we want to allow the driver to call
1818 * ieee80211_beacon_get() as a response to the set_tim()
1819 * callback. That, however, is already invoked under the
1820 * sta_lock to guarantee consistent and race-free update
1821 * of the tim bitmap in mac80211 and the driver.
1823 if (local->tim_in_locked_section) {
1824 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1826 unsigned long flags;
1828 spin_lock_irqsave(&local->sta_lock, flags);
1829 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1830 spin_unlock_irqrestore(&local->sta_lock, flags);
1834 memcpy(skb_put(skb, beacon->tail_len),
1835 beacon->tail, beacon->tail_len);
1837 num_beacons = &ap->num_beacons;
1841 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1842 /* headroom, head length, tail length and maximum TIM length */
1843 skb = dev_alloc_skb(local->tx_headroom + 400);
1847 skb_reserve(skb, local->hw.extra_tx_headroom);
1848 mgmt = (struct ieee80211_mgmt *)
1849 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1850 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1851 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1852 IEEE80211_STYPE_BEACON);
1853 memset(mgmt->da, 0xff, ETH_ALEN);
1854 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1855 /* BSSID is left zeroed, wildcard value */
1856 mgmt->u.beacon.beacon_int =
1857 cpu_to_le16(local->hw.conf.beacon_int);
1858 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1860 pos = skb_put(skb, 2);
1861 *pos++ = WLAN_EID_SSID;
1864 mesh_mgmt_ies_add(skb, sdata->dev);
1866 num_beacons = &sdata->u.sta.num_beacons;
1872 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1873 if (net_ratelimit())
1874 printk(KERN_DEBUG "no beacon data avail for %s\n",
1876 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1881 info = IEEE80211_SKB_CB(skb);
1884 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1886 if (unlikely(rsel.rate_idx < 0)) {
1887 if (net_ratelimit()) {
1888 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1890 wiphy_name(local->hw.wiphy));
1897 info->control.vif = vif;
1898 info->tx_rate_idx = rsel.rate_idx;
1899 if (sdata->bss_conf.use_short_preamble &&
1900 sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1901 info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
1902 info->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1903 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1904 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
1905 info->control.retry_limit = 1;
1906 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1912 EXPORT_SYMBOL(ieee80211_beacon_get);
1914 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1915 const void *frame, size_t frame_len,
1916 const struct ieee80211_tx_info *frame_txctl,
1917 struct ieee80211_rts *rts)
1919 const struct ieee80211_hdr *hdr = frame;
1922 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1923 rts->frame_control = cpu_to_le16(fctl);
1924 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1926 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1927 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1929 EXPORT_SYMBOL(ieee80211_rts_get);
1931 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1932 const void *frame, size_t frame_len,
1933 const struct ieee80211_tx_info *frame_txctl,
1934 struct ieee80211_cts *cts)
1936 const struct ieee80211_hdr *hdr = frame;
1939 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1940 cts->frame_control = cpu_to_le16(fctl);
1941 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1942 frame_len, frame_txctl);
1943 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1945 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1948 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1949 struct ieee80211_vif *vif)
1951 struct ieee80211_local *local = hw_to_local(hw);
1952 struct sk_buff *skb = NULL;
1953 struct sta_info *sta;
1954 ieee80211_tx_handler *handler;
1955 struct ieee80211_tx_data tx;
1956 ieee80211_tx_result res = TX_DROP;
1957 struct net_device *bdev;
1958 struct ieee80211_sub_if_data *sdata;
1959 struct ieee80211_if_ap *bss = NULL;
1960 struct beacon_data *beacon;
1961 struct ieee80211_tx_info *info;
1963 sdata = vif_to_sdata(vif);
1971 beacon = rcu_dereference(bss->beacon);
1973 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || !beacon->head)
1976 if (bss->dtim_count != 0)
1977 goto out; /* send buffered bc/mc only after DTIM beacon */
1980 skb = skb_dequeue(&bss->ps_bc_buf);
1983 local->total_ps_buffered--;
1985 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1986 struct ieee80211_hdr *hdr =
1987 (struct ieee80211_hdr *) skb->data;
1988 /* more buffered multicast/broadcast frames ==> set
1989 * MoreData flag in IEEE 802.11 header to inform PS
1991 hdr->frame_control |=
1992 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1995 if (!ieee80211_tx_prepare(&tx, skb, local->mdev))
1997 dev_kfree_skb_any(skb);
2000 info = IEEE80211_SKB_CB(skb);
2003 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2004 tx.channel = local->hw.conf.channel;
2005 info->band = tx.channel->band;
2007 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
2008 res = (*handler)(&tx);
2009 if (res == TX_DROP || res == TX_QUEUED)
2013 if (WARN_ON(tx.skb != skb))
2016 if (res == TX_DROP) {
2017 I802_DEBUG_INC(local->tx_handlers_drop);
2020 } else if (res == TX_QUEUED) {
2021 I802_DEBUG_INC(local->tx_handlers_queued);
2030 EXPORT_SYMBOL(ieee80211_get_buffered_bc);