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 __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
44 int rate, mrate, erp, dur, i;
45 struct ieee80211_rate *txrate;
46 struct ieee80211_local *local = tx->local;
47 struct ieee80211_supported_band *sband;
48 struct ieee80211_hdr *hdr;
49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
51 /* assume HW handles this */
52 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
56 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
59 sband = local->hw.wiphy->bands[tx->channel->band];
60 txrate = &sband->bitrates[info->control.rates[0].idx];
62 erp = txrate->flags & IEEE80211_RATE_ERP_G;
65 * data and mgmt (except PS Poll):
67 * - during contention period:
68 * if addr1 is group address: 0
69 * if more fragments = 0 and addr1 is individual address: time to
70 * transmit one ACK plus SIFS
71 * if more fragments = 1 and addr1 is individual address: time to
72 * transmit next fragment plus 2 x ACK plus 3 x SIFS
75 * - control response frame (CTS or ACK) shall be transmitted using the
76 * same rate as the immediately previous frame in the frame exchange
77 * sequence, if this rate belongs to the PHY mandatory rates, or else
78 * at the highest possible rate belonging to the PHY rates in the
81 hdr = (struct ieee80211_hdr *)tx->skb->data;
82 if (ieee80211_is_ctl(hdr->frame_control)) {
83 /* TODO: These control frames are not currently sent by
84 * mac80211, but should they be implemented, this function
85 * needs to be updated to support duration field calculation.
87 * RTS: time needed to transmit pending data/mgmt frame plus
88 * one CTS frame plus one ACK frame plus 3 x SIFS
89 * CTS: duration of immediately previous RTS minus time
90 * required to transmit CTS and its SIFS
91 * ACK: 0 if immediately previous directed data/mgmt had
92 * more=0, with more=1 duration in ACK frame is duration
93 * from previous frame minus time needed to transmit ACK
95 * PS Poll: BIT(15) | BIT(14) | aid
101 if (0 /* FIX: data/mgmt during CFP */)
102 return cpu_to_le16(32768);
104 if (group_addr) /* Group address as the destination - no ACK */
107 /* Individual destination address:
108 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
109 * CTS and ACK frames shall be transmitted using the highest rate in
110 * basic rate set that is less than or equal to the rate of the
111 * immediately previous frame and that is using the same modulation
112 * (CCK or OFDM). If no basic rate set matches with these requirements,
113 * the highest mandatory rate of the PHY that is less than or equal to
114 * the rate of the previous frame is used.
115 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
118 /* use lowest available if everything fails */
119 mrate = sband->bitrates[0].bitrate;
120 for (i = 0; i < sband->n_bitrates; i++) {
121 struct ieee80211_rate *r = &sband->bitrates[i];
123 if (r->bitrate > txrate->bitrate)
126 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
129 switch (sband->band) {
130 case IEEE80211_BAND_2GHZ: {
132 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
133 flag = IEEE80211_RATE_MANDATORY_G;
135 flag = IEEE80211_RATE_MANDATORY_B;
140 case IEEE80211_BAND_5GHZ:
141 if (r->flags & IEEE80211_RATE_MANDATORY_A)
144 case IEEE80211_NUM_BANDS:
150 /* No matching basic rate found; use highest suitable mandatory
155 /* Time needed to transmit ACK
156 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
157 * to closest integer */
159 dur = ieee80211_frame_duration(local, 10, rate, erp,
160 tx->sdata->vif.bss_conf.use_short_preamble);
163 /* Frame is fragmented: duration increases with time needed to
164 * transmit next fragment plus ACK and 2 x SIFS. */
165 dur *= 2; /* ACK + SIFS */
167 dur += ieee80211_frame_duration(local, next_frag_len,
168 txrate->bitrate, erp,
169 tx->sdata->vif.bss_conf.use_short_preamble);
172 return cpu_to_le16(dur);
175 static int inline is_ieee80211_device(struct ieee80211_local *local,
176 struct net_device *dev)
178 return local == wdev_priv(dev->ieee80211_ptr);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
187 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
188 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
191 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
194 if (unlikely(tx->local->sw_scanning) &&
195 !ieee80211_is_probe_req(hdr->frame_control))
198 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
201 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
204 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
206 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
207 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
208 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
209 ieee80211_is_data(hdr->frame_control))) {
210 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
211 printk(KERN_DEBUG "%s: dropped data frame to not "
212 "associated station %pM\n",
213 tx->dev->name, hdr->addr1);
214 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
215 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
219 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
220 tx->local->num_sta == 0 &&
221 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
223 * No associated STAs - no need to send multicast
234 /* This function is called whenever the AP is about to exceed the maximum limit
235 * of buffered frames for power saving STAs. This situation should not really
236 * happen often during normal operation, so dropping the oldest buffered packet
237 * from each queue should be OK to make some room for new frames. */
238 static void purge_old_ps_buffers(struct ieee80211_local *local)
240 int total = 0, purged = 0;
242 struct ieee80211_sub_if_data *sdata;
243 struct sta_info *sta;
246 * virtual interfaces are protected by RCU
250 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
251 struct ieee80211_if_ap *ap;
252 if (sdata->vif.type != NL80211_IFTYPE_AP)
255 skb = skb_dequeue(&ap->ps_bc_buf);
260 total += skb_queue_len(&ap->ps_bc_buf);
263 list_for_each_entry_rcu(sta, &local->sta_list, list) {
264 skb = skb_dequeue(&sta->ps_tx_buf);
269 total += skb_queue_len(&sta->ps_tx_buf);
274 local->total_ps_buffered = total;
275 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
276 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
277 wiphy_name(local->hw.wiphy), purged);
281 static ieee80211_tx_result
282 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 * broadcast/multicast frame
290 * If any of the associated stations is in power save mode,
291 * the frame is buffered to be sent after DTIM beacon frame.
292 * This is done either by the hardware or us.
295 /* powersaving STAs only in AP/VLAN mode */
299 /* no buffering for ordered frames */
300 if (ieee80211_has_order(hdr->frame_control))
303 /* no stations in PS mode */
304 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
307 /* buffered in mac80211 */
308 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
309 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
310 purge_old_ps_buffers(tx->local);
311 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
313 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
314 if (net_ratelimit()) {
315 printk(KERN_DEBUG "%s: BC TX buffer full - "
316 "dropping the oldest frame\n",
320 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
322 tx->local->total_ps_buffered++;
323 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
327 /* buffered in hardware */
328 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
333 static ieee80211_tx_result
334 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
336 struct sta_info *sta = tx->sta;
337 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
338 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
341 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
344 staflags = get_sta_flags(sta);
346 if (unlikely((staflags & WLAN_STA_PS) &&
347 !(staflags & WLAN_STA_PSPOLL))) {
348 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
349 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
351 sta->sta.addr, sta->sta.aid,
352 skb_queue_len(&sta->ps_tx_buf));
353 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
354 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
355 purge_old_ps_buffers(tx->local);
356 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
357 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
358 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
359 if (net_ratelimit()) {
360 printk(KERN_DEBUG "%s: STA %pM TX "
361 "buffer full - dropping oldest frame\n",
362 tx->dev->name, sta->sta.addr);
367 tx->local->total_ps_buffered++;
369 /* Queue frame to be sent after STA sends an PS Poll frame */
370 if (skb_queue_empty(&sta->ps_tx_buf))
371 sta_info_set_tim_bit(sta);
373 info->control.jiffies = jiffies;
374 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
377 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
378 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
379 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
380 "set -> send frame\n", tx->dev->name,
383 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
384 clear_sta_flags(sta, WLAN_STA_PSPOLL);
389 static ieee80211_tx_result debug_noinline
390 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
392 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
395 if (tx->flags & IEEE80211_TX_UNICAST)
396 return ieee80211_tx_h_unicast_ps_buf(tx);
398 return ieee80211_tx_h_multicast_ps_buf(tx);
401 static ieee80211_tx_result debug_noinline
402 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
404 struct ieee80211_key *key;
405 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
406 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
408 if (unlikely(tx->skb->do_not_encrypt))
410 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
412 else if ((key = rcu_dereference(tx->sdata->default_key)))
414 else if (tx->sdata->drop_unencrypted &&
415 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
416 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
417 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
423 tx->key->tx_rx_count++;
424 /* TODO: add threshold stuff again */
426 switch (tx->key->conf.alg) {
428 if (ieee80211_is_auth(hdr->frame_control))
432 if (!ieee80211_is_data_present(hdr->frame_control))
438 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
439 tx->skb->do_not_encrypt = 1;
444 static ieee80211_tx_result debug_noinline
445 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
447 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
448 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
449 struct ieee80211_supported_band *sband;
450 struct ieee80211_rate *rate;
452 bool inval = false, rts = false, short_preamble = false;
453 struct ieee80211_tx_rate_control txrc;
455 memset(&txrc, 0, sizeof(txrc));
457 sband = tx->local->hw.wiphy->bands[tx->channel->band];
459 len = min_t(int, tx->skb->len + FCS_LEN,
460 tx->local->fragmentation_threshold);
462 /* set up the tx rate control struct we give the RC algo */
463 txrc.hw = local_to_hw(tx->local);
465 txrc.bss_conf = &tx->sdata->vif.bss_conf;
467 txrc.reported_rate.idx = -1;
468 txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
470 /* set up RTS protection if desired */
471 if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD &&
472 len > tx->local->rts_threshold) {
473 txrc.rts = rts = true;
477 * Use short preamble if the BSS can handle it, but not for
478 * management frames unless we know the receiver can handle
479 * that -- the management frame might be to a station that
480 * just wants a probe response.
482 if (tx->sdata->vif.bss_conf.use_short_preamble &&
483 (ieee80211_is_data(hdr->frame_control) ||
484 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
485 txrc.short_preamble = short_preamble = true;
488 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
490 if (unlikely(info->control.rates[0].idx < 0))
493 if (txrc.reported_rate.idx < 0)
494 txrc.reported_rate = info->control.rates[0];
497 tx->sta->last_tx_rate = txrc.reported_rate;
499 if (unlikely(!info->control.rates[0].count))
500 info->control.rates[0].count = 1;
502 if (is_multicast_ether_addr(hdr->addr1)) {
504 * XXX: verify the rate is in the basic rateset
510 * set up the RTS/CTS rate as the fastest basic rate
511 * that is not faster than the data rate
513 * XXX: Should this check all retry rates?
515 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
518 rate = &sband->bitrates[info->control.rates[0].idx];
520 for (i = 0; i < sband->n_bitrates; i++) {
521 /* must be a basic rate */
522 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
524 /* must not be faster than the data rate */
525 if (sband->bitrates[i].bitrate > rate->bitrate)
528 if (sband->bitrates[baserate].bitrate <
529 sband->bitrates[i].bitrate)
533 info->control.rts_cts_rate_idx = baserate;
536 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
538 * make sure there's no valid rate following
539 * an invalid one, just in case drivers don't
540 * take the API seriously to stop at -1.
543 info->control.rates[i].idx = -1;
546 if (info->control.rates[i].idx < 0) {
552 * For now assume MCS is already set up correctly, this
555 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
556 WARN_ON(info->control.rates[i].idx > 76);
560 /* set up RTS protection if desired */
562 info->control.rates[i].flags |=
563 IEEE80211_TX_RC_USE_RTS_CTS;
566 if (WARN_ON_ONCE(info->control.rates[i].idx >=
567 sband->n_bitrates)) {
568 info->control.rates[i].idx = -1;
572 rate = &sband->bitrates[info->control.rates[i].idx];
574 /* set up short preamble */
575 if (short_preamble &&
576 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
577 info->control.rates[i].flags |=
578 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
580 /* set up G protection */
581 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
582 rate->flags & IEEE80211_RATE_ERP_G)
583 info->control.rates[i].flags |=
584 IEEE80211_TX_RC_USE_CTS_PROTECT;
590 static ieee80211_tx_result debug_noinline
591 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
593 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
596 info->control.sta = &tx->sta->sta;
601 static ieee80211_tx_result debug_noinline
602 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
604 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
605 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
611 * Packet injection may want to control the sequence
612 * number, if we have no matching interface then we
613 * neither assign one ourselves nor ask the driver to.
615 if (unlikely(!info->control.vif))
618 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
621 if (ieee80211_hdrlen(hdr->frame_control) < 24)
625 * Anything but QoS data that has a sequence number field
626 * (is long enough) gets a sequence number from the global
629 if (!ieee80211_is_data_qos(hdr->frame_control)) {
630 /* driver should assign sequence number */
631 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
632 /* for pure STA mode without beacons, we can do it */
633 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
634 tx->sdata->sequence_number += 0x10;
635 tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
640 * This should be true for injected/management frames only, for
641 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
642 * above since they are not QoS-data frames.
647 /* include per-STA, per-TID sequence counter */
649 qc = ieee80211_get_qos_ctl(hdr);
650 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
651 seq = &tx->sta->tid_seq[tid];
653 hdr->seq_ctrl = cpu_to_le16(*seq);
655 /* Increase the sequence number. */
656 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
666 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
667 struct sk_buff **frags, *first, *frag;
671 int frag_threshold = tx->local->fragmentation_threshold;
673 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
677 * Warn when submitting a fragmented A-MPDU frame and drop it.
678 * This scenario is handled in __ieee80211_tx_prepare but extra
679 * caution taken here as fragmented ampdu may cause Tx stop.
681 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
686 hdrlen = ieee80211_hdrlen(hdr->frame_control);
687 payload_len = first->len - hdrlen;
688 per_fragm = frag_threshold - hdrlen - FCS_LEN;
689 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
691 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
695 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
696 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
697 pos = first->data + hdrlen + per_fragm;
698 left = payload_len - per_fragm;
699 for (i = 0; i < num_fragm - 1; i++) {
700 struct ieee80211_hdr *fhdr;
701 struct ieee80211_tx_info *info;
707 /* reserve enough extra head and tail room for possible
710 dev_alloc_skb(tx->local->tx_headroom +
712 IEEE80211_ENCRYPT_HEADROOM +
713 IEEE80211_ENCRYPT_TAILROOM);
717 /* Make sure that all fragments use the same priority so
718 * that they end up using the same TX queue */
719 frag->priority = first->priority;
721 skb_reserve(frag, tx->local->tx_headroom +
722 IEEE80211_ENCRYPT_HEADROOM);
724 /* copy TX information */
725 info = IEEE80211_SKB_CB(frag);
726 memcpy(info, first->cb, sizeof(frag->cb));
728 /* copy/fill in 802.11 header */
729 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
730 memcpy(fhdr, first->data, hdrlen);
731 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
733 if (i == num_fragm - 2) {
734 /* clear MOREFRAGS bit for the last fragment */
735 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
738 * No multi-rate retries for fragmented frames, that
739 * would completely throw off the NAV at other STAs.
741 info->control.rates[1].idx = -1;
742 info->control.rates[2].idx = -1;
743 info->control.rates[3].idx = -1;
744 info->control.rates[4].idx = -1;
745 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
746 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
750 copylen = left > per_fragm ? per_fragm : left;
751 memcpy(skb_put(frag, copylen), pos, copylen);
753 skb_copy_queue_mapping(frag, first);
755 frag->do_not_encrypt = first->do_not_encrypt;
760 skb_trim(first, hdrlen + per_fragm);
762 tx->num_extra_frag = num_fragm - 1;
763 tx->extra_frag = frags;
769 for (i = 0; i < num_fragm - 1; i++)
771 dev_kfree_skb(frags[i]);
774 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
778 static ieee80211_tx_result debug_noinline
779 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
784 switch (tx->key->conf.alg) {
786 return ieee80211_crypto_wep_encrypt(tx);
788 return ieee80211_crypto_tkip_encrypt(tx);
790 return ieee80211_crypto_ccmp_encrypt(tx);
798 static ieee80211_tx_result debug_noinline
799 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
801 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
803 int group_addr = is_multicast_ether_addr(hdr->addr1);
805 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
806 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
810 hdr->duration_id = ieee80211_duration(tx, group_addr,
811 tx->extra_frag[0]->len);
813 for (i = 0; i < tx->num_extra_frag; i++) {
814 if (i + 1 < tx->num_extra_frag)
815 next_len = tx->extra_frag[i + 1]->len;
819 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
820 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
826 static ieee80211_tx_result debug_noinline
827 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
834 tx->sta->tx_packets++;
835 tx->sta->tx_fragments++;
836 tx->sta->tx_bytes += tx->skb->len;
837 if (tx->extra_frag) {
838 tx->sta->tx_fragments += tx->num_extra_frag;
839 for (i = 0; i < tx->num_extra_frag; i++)
840 tx->sta->tx_bytes += tx->extra_frag[i]->len;
847 /* actual transmit path */
850 * deal with packet injection down monitor interface
851 * with Radiotap Header -- only called for monitor mode interface
853 static ieee80211_tx_result
854 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
858 * this is the moment to interpret and discard the radiotap header that
859 * must be at the start of the packet injected in Monitor mode
861 * Need to take some care with endian-ness since radiotap
862 * args are little-endian
865 struct ieee80211_radiotap_iterator iterator;
866 struct ieee80211_radiotap_header *rthdr =
867 (struct ieee80211_radiotap_header *) skb->data;
868 struct ieee80211_supported_band *sband;
869 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
871 sband = tx->local->hw.wiphy->bands[tx->channel->band];
873 skb->do_not_encrypt = 1;
874 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
877 * for every radiotap entry that is present
878 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
879 * entries present, or -EINVAL on error)
883 ret = ieee80211_radiotap_iterator_next(&iterator);
888 /* see if this argument is something we can use */
889 switch (iterator.this_arg_index) {
891 * You must take care when dereferencing iterator.this_arg
892 * for multibyte types... the pointer is not aligned. Use
893 * get_unaligned((type *)iterator.this_arg) to dereference
894 * iterator.this_arg for type "type" safely on all arches.
896 case IEEE80211_RADIOTAP_FLAGS:
897 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
899 * this indicates that the skb we have been
900 * handed has the 32-bit FCS CRC at the end...
901 * we should react to that by snipping it off
902 * because it will be recomputed and added
905 if (skb->len < (iterator.max_length + FCS_LEN))
908 skb_trim(skb, skb->len - FCS_LEN);
910 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
911 tx->skb->do_not_encrypt = 0;
912 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
913 tx->flags |= IEEE80211_TX_FRAGMENTED;
917 * Please update the file
918 * Documentation/networking/mac80211-injection.txt
919 * when parsing new fields here.
927 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
931 * remove the radiotap header
932 * iterator->max_length was sanity-checked against
933 * skb->len by iterator init
935 skb_pull(skb, iterator.max_length);
943 static ieee80211_tx_result
944 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
946 struct net_device *dev)
948 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
949 struct ieee80211_hdr *hdr;
950 struct ieee80211_sub_if_data *sdata;
951 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
956 memset(tx, 0, sizeof(*tx));
958 tx->dev = dev; /* use original interface */
960 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
961 tx->channel = local->hw.conf.channel;
963 * Set this flag (used below to indicate "automatic fragmentation"),
964 * it will be cleared/left by radiotap as desired.
966 tx->flags |= IEEE80211_TX_FRAGMENTED;
968 /* process and remove the injection radiotap header */
969 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
970 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
971 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
975 * __ieee80211_parse_tx_radiotap has now removed
976 * the radiotap header that was present and pre-filled
977 * 'tx' with tx control information.
981 hdr = (struct ieee80211_hdr *) skb->data;
983 tx->sta = sta_info_get(local, hdr->addr1);
985 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control)) {
986 qc = ieee80211_get_qos_ctl(hdr);
987 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
989 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
990 if (*state == HT_AGG_STATE_OPERATIONAL)
991 info->flags |= IEEE80211_TX_CTL_AMPDU;
994 if (is_multicast_ether_addr(hdr->addr1)) {
995 tx->flags &= ~IEEE80211_TX_UNICAST;
996 info->flags |= IEEE80211_TX_CTL_NO_ACK;
998 tx->flags |= IEEE80211_TX_UNICAST;
999 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1002 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1003 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1004 skb->len + FCS_LEN > local->fragmentation_threshold &&
1005 !local->ops->set_frag_threshold &&
1006 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1007 tx->flags |= IEEE80211_TX_FRAGMENTED;
1009 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1013 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1014 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1015 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1017 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1018 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1019 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1020 tx->ethertype = (pos[0] << 8) | pos[1];
1022 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1028 * NB: @tx is uninitialised when passed in here
1030 static int ieee80211_tx_prepare(struct ieee80211_local *local,
1031 struct ieee80211_tx_data *tx,
1032 struct sk_buff *skb)
1034 struct net_device *dev;
1036 dev = dev_get_by_index(&init_net, skb->iif);
1037 if (unlikely(dev && !is_ieee80211_device(local, dev))) {
1043 /* initialises tx with control */
1044 __ieee80211_tx_prepare(tx, skb, dev);
1049 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1050 struct ieee80211_tx_data *tx)
1052 struct ieee80211_tx_info *info;
1056 if (netif_subqueue_stopped(local->mdev, skb))
1057 return IEEE80211_TX_AGAIN;
1058 info = IEEE80211_SKB_CB(skb);
1060 ret = local->ops->tx(local_to_hw(local), skb);
1062 return IEEE80211_TX_AGAIN;
1063 local->mdev->trans_start = jiffies;
1064 ieee80211_led_tx(local, 1);
1066 if (tx->extra_frag) {
1067 for (i = 0; i < tx->num_extra_frag; i++) {
1068 if (!tx->extra_frag[i])
1070 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
1071 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1072 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1073 if (netif_subqueue_stopped(local->mdev,
1075 return IEEE80211_TX_FRAG_AGAIN;
1077 ret = local->ops->tx(local_to_hw(local),
1080 return IEEE80211_TX_FRAG_AGAIN;
1081 local->mdev->trans_start = jiffies;
1082 ieee80211_led_tx(local, 1);
1083 tx->extra_frag[i] = NULL;
1085 kfree(tx->extra_frag);
1086 tx->extra_frag = NULL;
1088 return IEEE80211_TX_OK;
1092 * Invoke TX handlers, return 0 on success and non-zero if the
1093 * frame was dropped or queued.
1095 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1097 struct sk_buff *skb = tx->skb;
1098 ieee80211_tx_result res = TX_DROP;
1101 #define CALL_TXH(txh) \
1103 if (res != TX_CONTINUE) \
1106 CALL_TXH(ieee80211_tx_h_check_assoc)
1107 CALL_TXH(ieee80211_tx_h_ps_buf)
1108 CALL_TXH(ieee80211_tx_h_select_key)
1109 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1110 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1111 CALL_TXH(ieee80211_tx_h_misc)
1112 CALL_TXH(ieee80211_tx_h_sequence)
1113 CALL_TXH(ieee80211_tx_h_fragment)
1114 /* handlers after fragment must be aware of tx info fragmentation! */
1115 CALL_TXH(ieee80211_tx_h_encrypt)
1116 CALL_TXH(ieee80211_tx_h_calculate_duration)
1117 CALL_TXH(ieee80211_tx_h_stats)
1121 if (unlikely(res == TX_DROP)) {
1122 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1124 for (i = 0; i < tx->num_extra_frag; i++)
1125 if (tx->extra_frag[i])
1126 dev_kfree_skb(tx->extra_frag[i]);
1127 kfree(tx->extra_frag);
1129 } else if (unlikely(res == TX_QUEUED)) {
1130 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1137 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1139 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1140 struct sta_info *sta;
1141 struct ieee80211_tx_data tx;
1142 ieee80211_tx_result res_prepare;
1143 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1147 queue = skb_get_queue_mapping(skb);
1149 WARN_ON(test_bit(queue, local->queues_pending));
1151 if (unlikely(skb->len < 10)) {
1158 /* initialises tx */
1159 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1161 if (res_prepare == TX_DROP) {
1168 tx.channel = local->hw.conf.channel;
1169 info->band = tx.channel->band;
1171 if (invoke_tx_handlers(&tx))
1175 ret = __ieee80211_tx(local, skb, &tx);
1177 struct ieee80211_tx_stored_packet *store;
1180 * Since there are no fragmented frames on A-MPDU
1181 * queues, there's no reason for a driver to reject
1182 * a frame there, warn and drop it.
1184 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1187 store = &local->pending_packet[queue];
1189 if (ret == IEEE80211_TX_FRAG_AGAIN)
1192 set_bit(queue, local->queues_pending);
1195 * When the driver gets out of buffers during sending of
1196 * fragments and calls ieee80211_stop_queue, the netif
1197 * subqueue is stopped. There is, however, a small window
1198 * in which the PENDING bit is not yet set. If a buffer
1199 * gets available in that window (i.e. driver calls
1200 * ieee80211_wake_queue), we would end up with ieee80211_tx
1201 * called with the PENDING bit still set. Prevent this by
1202 * continuing transmitting here when that situation is
1203 * possible to have happened.
1205 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1206 clear_bit(queue, local->queues_pending);
1210 store->extra_frag = tx.extra_frag;
1211 store->num_extra_frag = tx.num_extra_frag;
1220 for (i = 0; i < tx.num_extra_frag; i++)
1221 if (tx.extra_frag[i])
1222 dev_kfree_skb(tx.extra_frag[i]);
1223 kfree(tx.extra_frag);
1228 /* device xmit handlers */
1230 static int ieee80211_skb_resize(struct ieee80211_local *local,
1231 struct sk_buff *skb,
1232 int head_need, bool may_encrypt)
1237 * This could be optimised, devices that do full hardware
1238 * crypto (including TKIP MMIC) need no tailroom... But we
1239 * have no drivers for such devices currently.
1242 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1243 tail_need -= skb_tailroom(skb);
1244 tail_need = max_t(int, tail_need, 0);
1247 if (head_need || tail_need) {
1248 /* Sorry. Can't account for this any more */
1252 if (skb_header_cloned(skb))
1253 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1255 I802_DEBUG_INC(local->tx_expand_skb_head);
1257 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1258 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1259 wiphy_name(local->hw.wiphy));
1263 /* update truesize too */
1264 skb->truesize += head_need + tail_need;
1269 int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
1271 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
1272 struct ieee80211_local *local = mpriv->local;
1273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1275 struct net_device *odev = NULL;
1276 struct ieee80211_sub_if_data *osdata;
1283 } monitor_iface = NOT_MONITOR;
1287 odev = dev_get_by_index(&init_net, skb->iif);
1288 if (unlikely(odev && !is_ieee80211_device(local, odev))) {
1292 if (unlikely(!odev)) {
1293 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1294 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1295 "originating device\n", dev->name);
1301 memset(info, 0, sizeof(*info));
1303 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1305 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1307 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1308 ieee80211_is_data(hdr->frame_control)) {
1309 if (is_multicast_ether_addr(hdr->addr3))
1310 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1312 if (mesh_nexthop_lookup(skb, osdata))
1314 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1315 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1317 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1318 struct ieee80211_sub_if_data *sdata;
1322 info->flags |= IEEE80211_TX_CTL_INJECTED;
1323 monitor_iface = UNKNOWN_ADDRESS;
1325 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1326 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1327 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1329 /* check the header is complete in the frame */
1330 if (likely(skb->len >= len_rthdr + hdrlen)) {
1332 * We process outgoing injected frames that have a
1333 * local address we handle as though they are our
1335 * This code here isn't entirely correct, the local
1336 * MAC address is not necessarily enough to find
1337 * the interface to use; for that proper VLAN/WDS
1338 * support we will need a different mechanism.
1342 list_for_each_entry_rcu(sdata, &local->interfaces,
1344 if (!netif_running(sdata->dev))
1346 if (compare_ether_addr(sdata->dev->dev_addr,
1348 dev_hold(sdata->dev);
1352 skb->iif = sdata->dev->ifindex;
1353 monitor_iface = FOUND_SDATA;
1361 may_encrypt = !skb->do_not_encrypt;
1363 headroom = osdata->local->tx_headroom;
1365 headroom += IEEE80211_ENCRYPT_HEADROOM;
1366 headroom -= skb_headroom(skb);
1367 headroom = max_t(int, 0, headroom);
1369 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1375 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1376 osdata = container_of(osdata->bss,
1377 struct ieee80211_sub_if_data,
1379 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1380 info->control.vif = &osdata->vif;
1381 ret = ieee80211_tx(odev, skb);
1387 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1388 struct net_device *dev)
1390 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1391 struct ieee80211_radiotap_header *prthdr =
1392 (struct ieee80211_radiotap_header *)skb->data;
1395 /* check for not even having the fixed radiotap header part */
1396 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1397 goto fail; /* too short to be possibly valid */
1399 /* is it a header version we can trust to find length from? */
1400 if (unlikely(prthdr->it_version))
1401 goto fail; /* only version 0 is supported */
1403 /* then there must be a radiotap header with a length we can use */
1404 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1406 /* does the skb contain enough to deliver on the alleged length? */
1407 if (unlikely(skb->len < len_rthdr))
1408 goto fail; /* skb too short for claimed rt header extent */
1410 skb->dev = local->mdev;
1412 /* needed because we set skb device to master */
1413 skb->iif = dev->ifindex;
1415 /* sometimes we do encrypt injected frames, will be fixed
1416 * up in radiotap parser if not wanted */
1417 skb->do_not_encrypt = 0;
1420 * fix up the pointers accounting for the radiotap
1421 * header still being in there. We are being given
1422 * a precooked IEEE80211 header so no need for
1425 skb_set_mac_header(skb, len_rthdr);
1427 * these are just fixed to the end of the rt area since we
1428 * don't have any better information and at this point, nobody cares
1430 skb_set_network_header(skb, len_rthdr);
1431 skb_set_transport_header(skb, len_rthdr);
1433 /* pass the radiotap header up to the next stage intact */
1434 dev_queue_xmit(skb);
1435 return NETDEV_TX_OK;
1439 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1443 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1444 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1445 * @skb: packet to be sent
1446 * @dev: incoming interface
1448 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1449 * not be freed, and caller is responsible for either retrying later or freeing
1452 * This function takes in an Ethernet header and encapsulates it with suitable
1453 * IEEE 802.11 header based on which interface the packet is coming in. The
1454 * encapsulated packet will then be passed to master interface, wlan#.11, for
1455 * transmission (through low-level driver).
1457 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1458 struct net_device *dev)
1460 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1461 struct ieee80211_local *local = sdata->local;
1462 int ret = 1, head_need;
1463 u16 ethertype, hdrlen, meshhdrlen = 0;
1465 struct ieee80211_hdr hdr;
1466 struct ieee80211s_hdr mesh_hdr;
1467 const u8 *encaps_data;
1468 int encaps_len, skip_header_bytes;
1470 struct sta_info *sta;
1473 if (unlikely(skb->len < ETH_HLEN)) {
1478 nh_pos = skb_network_header(skb) - skb->data;
1479 h_pos = skb_transport_header(skb) - skb->data;
1481 /* convert Ethernet header to proper 802.11 header (based on
1482 * operation mode) */
1483 ethertype = (skb->data[12] << 8) | skb->data[13];
1484 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1486 switch (sdata->vif.type) {
1487 case NL80211_IFTYPE_AP:
1488 case NL80211_IFTYPE_AP_VLAN:
1489 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1491 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1492 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1493 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1496 case NL80211_IFTYPE_WDS:
1497 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1499 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1500 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1501 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1502 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1505 #ifdef CONFIG_MAC80211_MESH
1506 case NL80211_IFTYPE_MESH_POINT:
1507 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1508 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1509 /* Do not send frames with mesh_ttl == 0 */
1510 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1514 memset(&mesh_hdr, 0, sizeof(mesh_hdr));
1516 if (compare_ether_addr(dev->dev_addr,
1517 skb->data + ETH_ALEN) == 0) {
1519 memset(hdr.addr1, 0, ETH_ALEN);
1520 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1521 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1522 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1523 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1525 /* packet from other interface */
1526 struct mesh_path *mppath;
1528 memset(hdr.addr1, 0, ETH_ALEN);
1529 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1530 memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN);
1532 if (is_multicast_ether_addr(skb->data))
1533 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1536 mppath = mpp_path_lookup(skb->data, sdata);
1538 memcpy(hdr.addr3, mppath->mpp, ETH_ALEN);
1540 memset(hdr.addr3, 0xff, ETH_ALEN);
1544 mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6;
1545 mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
1546 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum);
1547 memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN);
1548 memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN);
1549 sdata->u.mesh.mesh_seqnum++;
1555 case NL80211_IFTYPE_STATION:
1556 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1558 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1559 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1560 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1563 case NL80211_IFTYPE_ADHOC:
1565 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1566 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1567 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1576 * There's no need to try to look up the destination
1577 * if it is a multicast address (which can only happen
1580 if (!is_multicast_ether_addr(hdr.addr1)) {
1582 sta = sta_info_get(local, hdr.addr1);
1584 sta_flags = get_sta_flags(sta);
1588 /* receiver and we are QoS enabled, use a QoS type frame */
1589 if (sta_flags & WLAN_STA_WME &&
1590 ieee80211_num_regular_queues(&local->hw) >= 4) {
1591 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1596 * Drop unicast frames to unauthorised stations unless they are
1597 * EAPOL frames from the local station.
1599 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1600 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1601 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1602 !(ethertype == ETH_P_PAE &&
1603 compare_ether_addr(dev->dev_addr,
1604 skb->data + ETH_ALEN) == 0))) {
1605 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1606 if (net_ratelimit())
1607 printk(KERN_DEBUG "%s: dropped frame to %pM"
1608 " (unauthorized port)\n", dev->name,
1612 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1618 hdr.frame_control = fc;
1619 hdr.duration_id = 0;
1622 skip_header_bytes = ETH_HLEN;
1623 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1624 encaps_data = bridge_tunnel_header;
1625 encaps_len = sizeof(bridge_tunnel_header);
1626 skip_header_bytes -= 2;
1627 } else if (ethertype >= 0x600) {
1628 encaps_data = rfc1042_header;
1629 encaps_len = sizeof(rfc1042_header);
1630 skip_header_bytes -= 2;
1636 skb_pull(skb, skip_header_bytes);
1637 nh_pos -= skip_header_bytes;
1638 h_pos -= skip_header_bytes;
1640 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1643 * So we need to modify the skb header and hence need a copy of
1644 * that. The head_need variable above doesn't, so far, include
1645 * the needed header space that we don't need right away. If we
1646 * can, then we don't reallocate right now but only after the
1647 * frame arrives at the master device (if it does...)
1649 * If we cannot, however, then we will reallocate to include all
1650 * the ever needed space. Also, if we need to reallocate it anyway,
1651 * make it big enough for everything we may ever need.
1654 if (head_need > 0 || skb_cloned(skb)) {
1655 head_need += IEEE80211_ENCRYPT_HEADROOM;
1656 head_need += local->tx_headroom;
1657 head_need = max_t(int, 0, head_need);
1658 if (ieee80211_skb_resize(local, skb, head_need, true))
1663 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1664 nh_pos += encaps_len;
1665 h_pos += encaps_len;
1668 if (meshhdrlen > 0) {
1669 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1670 nh_pos += meshhdrlen;
1671 h_pos += meshhdrlen;
1674 if (ieee80211_is_data_qos(fc)) {
1675 __le16 *qos_control;
1677 qos_control = (__le16*) skb_push(skb, 2);
1678 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1680 * Maybe we could actually set some fields here, for now just
1681 * initialise to zero to indicate no special operation.
1685 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1690 skb->iif = dev->ifindex;
1692 skb->dev = local->mdev;
1693 dev->stats.tx_packets++;
1694 dev->stats.tx_bytes += skb->len;
1696 /* Update skb pointers to various headers since this modified frame
1697 * is going to go through Linux networking code that may potentially
1698 * need things like pointer to IP header. */
1699 skb_set_mac_header(skb, 0);
1700 skb_set_network_header(skb, nh_pos);
1701 skb_set_transport_header(skb, h_pos);
1703 dev->trans_start = jiffies;
1704 dev_queue_xmit(skb);
1717 * ieee80211_clear_tx_pending may not be called in a context where
1718 * it is possible that it packets could come in again.
1720 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1723 struct ieee80211_tx_stored_packet *store;
1725 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1726 if (!test_bit(i, local->queues_pending))
1728 store = &local->pending_packet[i];
1729 kfree_skb(store->skb);
1730 for (j = 0; j < store->num_extra_frag; j++)
1731 kfree_skb(store->extra_frag[j]);
1732 kfree(store->extra_frag);
1733 clear_bit(i, local->queues_pending);
1738 * Transmit all pending packets. Called from tasklet, locks master device
1739 * TX lock so that no new packets can come in.
1741 void ieee80211_tx_pending(unsigned long data)
1743 struct ieee80211_local *local = (struct ieee80211_local *)data;
1744 struct net_device *dev = local->mdev;
1745 struct ieee80211_tx_stored_packet *store;
1746 struct ieee80211_tx_data tx;
1749 netif_tx_lock_bh(dev);
1750 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1751 /* Check that this queue is ok */
1752 if (__netif_subqueue_stopped(local->mdev, i) &&
1753 !test_bit(i, local->queues_pending_run))
1756 if (!test_bit(i, local->queues_pending)) {
1757 clear_bit(i, local->queues_pending_run);
1758 ieee80211_wake_queue(&local->hw, i);
1762 clear_bit(i, local->queues_pending_run);
1763 netif_start_subqueue(local->mdev, i);
1765 store = &local->pending_packet[i];
1766 tx.extra_frag = store->extra_frag;
1767 tx.num_extra_frag = store->num_extra_frag;
1769 ret = __ieee80211_tx(local, store->skb, &tx);
1771 if (ret == IEEE80211_TX_FRAG_AGAIN)
1774 clear_bit(i, local->queues_pending);
1775 ieee80211_wake_queue(&local->hw, i);
1778 netif_tx_unlock_bh(dev);
1781 /* functions for drivers to get certain frames */
1783 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1784 struct ieee80211_if_ap *bss,
1785 struct sk_buff *skb,
1786 struct beacon_data *beacon)
1790 int i, have_bits = 0, n1, n2;
1792 /* Generate bitmap for TIM only if there are any STAs in power save
1794 if (atomic_read(&bss->num_sta_ps) > 0)
1795 /* in the hope that this is faster than
1796 * checking byte-for-byte */
1797 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1798 IEEE80211_MAX_AID+1);
1800 if (bss->dtim_count == 0)
1801 bss->dtim_count = beacon->dtim_period - 1;
1805 tim = pos = (u8 *) skb_put(skb, 6);
1806 *pos++ = WLAN_EID_TIM;
1808 *pos++ = bss->dtim_count;
1809 *pos++ = beacon->dtim_period;
1811 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1815 /* Find largest even number N1 so that bits numbered 1 through
1816 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1817 * (N2 + 1) x 8 through 2007 are 0. */
1819 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1826 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1833 /* Bitmap control */
1835 /* Part Virt Bitmap */
1836 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1838 tim[1] = n2 - n1 + 4;
1839 skb_put(skb, n2 - n1);
1841 *pos++ = aid0; /* Bitmap control */
1842 *pos++ = 0; /* Part Virt Bitmap */
1846 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1847 struct ieee80211_vif *vif)
1849 struct ieee80211_local *local = hw_to_local(hw);
1850 struct sk_buff *skb = NULL;
1851 struct ieee80211_tx_info *info;
1852 struct net_device *bdev;
1853 struct ieee80211_sub_if_data *sdata = NULL;
1854 struct ieee80211_if_ap *ap = NULL;
1855 struct ieee80211_if_sta *ifsta = NULL;
1856 struct beacon_data *beacon;
1857 struct ieee80211_supported_band *sband;
1858 enum ieee80211_band band = local->hw.conf.channel->band;
1860 sband = local->hw.wiphy->bands[band];
1864 sdata = vif_to_sdata(vif);
1867 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1869 beacon = rcu_dereference(ap->beacon);
1872 * headroom, head length,
1873 * tail length and maximum TIM length
1875 skb = dev_alloc_skb(local->tx_headroom +
1877 beacon->tail_len + 256);
1881 skb_reserve(skb, local->tx_headroom);
1882 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1886 * Not very nice, but we want to allow the driver to call
1887 * ieee80211_beacon_get() as a response to the set_tim()
1888 * callback. That, however, is already invoked under the
1889 * sta_lock to guarantee consistent and race-free update
1890 * of the tim bitmap in mac80211 and the driver.
1892 if (local->tim_in_locked_section) {
1893 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1895 unsigned long flags;
1897 spin_lock_irqsave(&local->sta_lock, flags);
1898 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1899 spin_unlock_irqrestore(&local->sta_lock, flags);
1903 memcpy(skb_put(skb, beacon->tail_len),
1904 beacon->tail, beacon->tail_len);
1907 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1908 struct ieee80211_hdr *hdr;
1909 ifsta = &sdata->u.sta;
1911 if (!ifsta->probe_resp)
1914 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1918 hdr = (struct ieee80211_hdr *) skb->data;
1919 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1920 IEEE80211_STYPE_BEACON);
1922 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1923 struct ieee80211_mgmt *mgmt;
1926 /* headroom, head length, tail length and maximum TIM length */
1927 skb = dev_alloc_skb(local->tx_headroom + 400);
1931 skb_reserve(skb, local->hw.extra_tx_headroom);
1932 mgmt = (struct ieee80211_mgmt *)
1933 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1934 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1935 mgmt->frame_control =
1936 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
1937 memset(mgmt->da, 0xff, ETH_ALEN);
1938 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1939 /* BSSID is left zeroed, wildcard value */
1940 mgmt->u.beacon.beacon_int =
1941 cpu_to_le16(local->hw.conf.beacon_int);
1942 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1944 pos = skb_put(skb, 2);
1945 *pos++ = WLAN_EID_SSID;
1948 mesh_mgmt_ies_add(skb, sdata);
1954 info = IEEE80211_SKB_CB(skb);
1956 skb->do_not_encrypt = 1;
1960 * XXX: For now, always use the lowest rate
1962 info->control.rates[0].idx = 0;
1963 info->control.rates[0].count = 1;
1964 info->control.rates[1].idx = -1;
1965 info->control.rates[2].idx = -1;
1966 info->control.rates[3].idx = -1;
1967 info->control.rates[4].idx = -1;
1968 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
1970 info->control.vif = vif;
1972 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1973 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1974 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
1979 EXPORT_SYMBOL(ieee80211_beacon_get);
1981 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1982 const void *frame, size_t frame_len,
1983 const struct ieee80211_tx_info *frame_txctl,
1984 struct ieee80211_rts *rts)
1986 const struct ieee80211_hdr *hdr = frame;
1988 rts->frame_control =
1989 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
1990 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1992 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1993 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1995 EXPORT_SYMBOL(ieee80211_rts_get);
1997 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1998 const void *frame, size_t frame_len,
1999 const struct ieee80211_tx_info *frame_txctl,
2000 struct ieee80211_cts *cts)
2002 const struct ieee80211_hdr *hdr = frame;
2004 cts->frame_control =
2005 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2006 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2007 frame_len, frame_txctl);
2008 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2010 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2013 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2014 struct ieee80211_vif *vif)
2016 struct ieee80211_local *local = hw_to_local(hw);
2017 struct sk_buff *skb = NULL;
2018 struct sta_info *sta;
2019 struct ieee80211_tx_data tx;
2020 struct net_device *bdev;
2021 struct ieee80211_sub_if_data *sdata;
2022 struct ieee80211_if_ap *bss = NULL;
2023 struct beacon_data *beacon;
2024 struct ieee80211_tx_info *info;
2026 sdata = vif_to_sdata(vif);
2034 beacon = rcu_dereference(bss->beacon);
2036 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2039 if (bss->dtim_count != 0)
2040 goto out; /* send buffered bc/mc only after DTIM beacon */
2043 skb = skb_dequeue(&bss->ps_bc_buf);
2046 local->total_ps_buffered--;
2048 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2049 struct ieee80211_hdr *hdr =
2050 (struct ieee80211_hdr *) skb->data;
2051 /* more buffered multicast/broadcast frames ==> set
2052 * MoreData flag in IEEE 802.11 header to inform PS
2054 hdr->frame_control |=
2055 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2058 if (!ieee80211_tx_prepare(local, &tx, skb))
2060 dev_kfree_skb_any(skb);
2063 info = IEEE80211_SKB_CB(skb);
2066 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2067 tx.channel = local->hw.conf.channel;
2068 info->band = tx.channel->band;
2070 if (invoke_tx_handlers(&tx))
2077 EXPORT_SYMBOL(ieee80211_get_buffered_bc);