2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
36 #define IEEE80211_TX_OK 0
37 #define IEEE80211_TX_AGAIN 1
38 #define IEEE80211_TX_PENDING 2
42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
45 int rate, mrate, erp, dur, i;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
52 /* assume HW handles this */
53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
57 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
60 sband = local->hw.wiphy->bands[tx->channel->band];
61 txrate = &sband->bitrates[info->control.rates[0].idx];
63 erp = txrate->flags & IEEE80211_RATE_ERP_G;
66 * data and mgmt (except PS Poll):
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
82 hdr = (struct ieee80211_hdr *)tx->skb->data;
83 if (ieee80211_is_ctl(hdr->frame_control)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
96 * PS Poll: BIT(15) | BIT(14) | aid
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
105 if (group_addr) /* Group address as the destination - no ACK */
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
119 /* use lowest available if everything fails */
120 mrate = sband->bitrates[0].bitrate;
121 for (i = 0; i < sband->n_bitrates; i++) {
122 struct ieee80211_rate *r = &sband->bitrates[i];
124 if (r->bitrate > txrate->bitrate)
127 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
130 switch (sband->band) {
131 case IEEE80211_BAND_2GHZ: {
133 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
134 flag = IEEE80211_RATE_MANDATORY_G;
136 flag = IEEE80211_RATE_MANDATORY_B;
141 case IEEE80211_BAND_5GHZ:
142 if (r->flags & IEEE80211_RATE_MANDATORY_A)
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
160 dur = ieee80211_frame_duration(local, 10, rate, erp,
161 tx->sdata->vif.bss_conf.use_short_preamble);
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur *= 2; /* ACK + SIFS */
168 dur += ieee80211_frame_duration(local, next_frag_len,
169 txrate->bitrate, erp,
170 tx->sdata->vif.bss_conf.use_short_preamble);
173 return cpu_to_le16(dur);
176 static int inline is_ieee80211_device(struct ieee80211_local *local,
177 struct net_device *dev)
179 return local == wdev_priv(dev->ieee80211_ptr);
184 static ieee80211_tx_result debug_noinline
185 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
188 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
189 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
192 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
195 if (unlikely(tx->local->sw_scanning) &&
196 !ieee80211_is_probe_req(hdr->frame_control) &&
197 !ieee80211_is_nullfunc(hdr->frame_control))
199 * When software scanning only nullfunc frames (to notify
200 * the sleep state to the AP) and probe requests (for the
201 * active scan) are allowed, all other frames should not be
202 * sent and we should not get here, but if we do
203 * nonetheless, drop them to avoid sending them
204 * off-channel. See the link below and
205 * ieee80211_start_scan() for more.
207 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
211 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
214 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
217 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
219 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
220 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
221 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
222 ieee80211_is_data(hdr->frame_control))) {
223 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
224 printk(KERN_DEBUG "%s: dropped data frame to not "
225 "associated station %pM\n",
226 tx->dev->name, hdr->addr1);
227 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
228 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
232 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
233 tx->local->num_sta == 0 &&
234 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
236 * No associated STAs - no need to send multicast
247 /* This function is called whenever the AP is about to exceed the maximum limit
248 * of buffered frames for power saving STAs. This situation should not really
249 * happen often during normal operation, so dropping the oldest buffered packet
250 * from each queue should be OK to make some room for new frames. */
251 static void purge_old_ps_buffers(struct ieee80211_local *local)
253 int total = 0, purged = 0;
255 struct ieee80211_sub_if_data *sdata;
256 struct sta_info *sta;
259 * virtual interfaces are protected by RCU
263 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
264 struct ieee80211_if_ap *ap;
265 if (sdata->vif.type != NL80211_IFTYPE_AP)
268 skb = skb_dequeue(&ap->ps_bc_buf);
273 total += skb_queue_len(&ap->ps_bc_buf);
276 list_for_each_entry_rcu(sta, &local->sta_list, list) {
277 skb = skb_dequeue(&sta->ps_tx_buf);
282 total += skb_queue_len(&sta->ps_tx_buf);
287 local->total_ps_buffered = total;
288 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
289 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
290 wiphy_name(local->hw.wiphy), purged);
294 static ieee80211_tx_result
295 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
297 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
298 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
301 * broadcast/multicast frame
303 * If any of the associated stations is in power save mode,
304 * the frame is buffered to be sent after DTIM beacon frame.
305 * This is done either by the hardware or us.
308 /* powersaving STAs only in AP/VLAN mode */
312 /* no buffering for ordered frames */
313 if (ieee80211_has_order(hdr->frame_control))
316 /* no stations in PS mode */
317 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
320 /* buffered in mac80211 */
321 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
322 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
323 purge_old_ps_buffers(tx->local);
324 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
326 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
327 if (net_ratelimit()) {
328 printk(KERN_DEBUG "%s: BC TX buffer full - "
329 "dropping the oldest frame\n",
333 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
335 tx->local->total_ps_buffered++;
336 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
340 /* buffered in hardware */
341 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
346 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
349 if (!ieee80211_is_mgmt(fc))
352 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
355 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
362 static ieee80211_tx_result
363 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
365 struct sta_info *sta = tx->sta;
366 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
370 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
373 staflags = get_sta_flags(sta);
375 if (unlikely((staflags & WLAN_STA_PS) &&
376 !(staflags & WLAN_STA_PSPOLL))) {
377 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
378 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
380 sta->sta.addr, sta->sta.aid,
381 skb_queue_len(&sta->ps_tx_buf));
382 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
383 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
384 purge_old_ps_buffers(tx->local);
385 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
386 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
387 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
388 if (net_ratelimit()) {
389 printk(KERN_DEBUG "%s: STA %pM TX "
390 "buffer full - dropping oldest frame\n",
391 tx->dev->name, sta->sta.addr);
396 tx->local->total_ps_buffered++;
398 /* Queue frame to be sent after STA sends an PS Poll frame */
399 if (skb_queue_empty(&sta->ps_tx_buf))
400 sta_info_set_tim_bit(sta);
402 info->control.jiffies = jiffies;
403 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
406 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
407 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
408 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
409 "set -> send frame\n", tx->dev->name,
412 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
413 if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) {
415 * The sleeping station with pending data is now snoozing.
416 * It queried us for its buffered frames and will go back
417 * to deep sleep once it got everything.
419 * inform the driver, in case the hardware does powersave
420 * frame filtering and keeps a station blacklist on its own
421 * (e.g: p54), so that frames can be delivered unimpeded.
423 * Note: It should be save to disable the filter now.
424 * As, it is really unlikely that we still have any pending
425 * frame for this station in the hw's buffers/fifos left,
426 * that is not rejected with a unsuccessful tx_status yet.
429 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
434 static ieee80211_tx_result debug_noinline
435 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
437 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
440 if (tx->flags & IEEE80211_TX_UNICAST)
441 return ieee80211_tx_h_unicast_ps_buf(tx);
443 return ieee80211_tx_h_multicast_ps_buf(tx);
446 static ieee80211_tx_result debug_noinline
447 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
449 struct ieee80211_key *key = NULL;
450 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
453 if (unlikely(tx->skb->do_not_encrypt))
455 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
457 else if (ieee80211_is_mgmt(hdr->frame_control) &&
458 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
460 else if ((key = rcu_dereference(tx->sdata->default_key)))
462 else if (tx->sdata->drop_unencrypted &&
463 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
464 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
465 (!ieee80211_is_robust_mgmt_frame(hdr) ||
466 (ieee80211_is_action(hdr->frame_control) &&
467 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
468 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
474 tx->key->tx_rx_count++;
475 /* TODO: add threshold stuff again */
477 switch (tx->key->conf.alg) {
479 if (ieee80211_is_auth(hdr->frame_control))
482 if (!ieee80211_is_data_present(hdr->frame_control))
486 if (!ieee80211_is_data_present(hdr->frame_control) &&
487 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
492 if (!ieee80211_is_mgmt(hdr->frame_control))
498 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
499 tx->skb->do_not_encrypt = 1;
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
507 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
508 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
509 struct ieee80211_supported_band *sband;
510 struct ieee80211_rate *rate;
512 bool inval = false, rts = false, short_preamble = false;
513 struct ieee80211_tx_rate_control txrc;
515 memset(&txrc, 0, sizeof(txrc));
517 sband = tx->local->hw.wiphy->bands[tx->channel->band];
519 len = min_t(int, tx->skb->len + FCS_LEN,
520 tx->local->hw.wiphy->frag_threshold);
522 /* set up the tx rate control struct we give the RC algo */
523 txrc.hw = local_to_hw(tx->local);
525 txrc.bss_conf = &tx->sdata->vif.bss_conf;
527 txrc.reported_rate.idx = -1;
528 txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
530 /* set up RTS protection if desired */
531 if (len > tx->local->hw.wiphy->rts_threshold) {
532 txrc.rts = rts = true;
536 * Use short preamble if the BSS can handle it, but not for
537 * management frames unless we know the receiver can handle
538 * that -- the management frame might be to a station that
539 * just wants a probe response.
541 if (tx->sdata->vif.bss_conf.use_short_preamble &&
542 (ieee80211_is_data(hdr->frame_control) ||
543 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
544 txrc.short_preamble = short_preamble = true;
547 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
549 if (unlikely(info->control.rates[0].idx < 0))
552 if (txrc.reported_rate.idx < 0)
553 txrc.reported_rate = info->control.rates[0];
556 tx->sta->last_tx_rate = txrc.reported_rate;
558 if (unlikely(!info->control.rates[0].count))
559 info->control.rates[0].count = 1;
561 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
562 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
563 info->control.rates[0].count = 1;
565 if (is_multicast_ether_addr(hdr->addr1)) {
567 * XXX: verify the rate is in the basic rateset
573 * set up the RTS/CTS rate as the fastest basic rate
574 * that is not faster than the data rate
576 * XXX: Should this check all retry rates?
578 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
581 rate = &sband->bitrates[info->control.rates[0].idx];
583 for (i = 0; i < sband->n_bitrates; i++) {
584 /* must be a basic rate */
585 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
587 /* must not be faster than the data rate */
588 if (sband->bitrates[i].bitrate > rate->bitrate)
591 if (sband->bitrates[baserate].bitrate <
592 sband->bitrates[i].bitrate)
596 info->control.rts_cts_rate_idx = baserate;
599 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
601 * make sure there's no valid rate following
602 * an invalid one, just in case drivers don't
603 * take the API seriously to stop at -1.
606 info->control.rates[i].idx = -1;
609 if (info->control.rates[i].idx < 0) {
615 * For now assume MCS is already set up correctly, this
618 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
619 WARN_ON(info->control.rates[i].idx > 76);
623 /* set up RTS protection if desired */
625 info->control.rates[i].flags |=
626 IEEE80211_TX_RC_USE_RTS_CTS;
629 if (WARN_ON_ONCE(info->control.rates[i].idx >=
630 sband->n_bitrates)) {
631 info->control.rates[i].idx = -1;
635 rate = &sband->bitrates[info->control.rates[i].idx];
637 /* set up short preamble */
638 if (short_preamble &&
639 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
640 info->control.rates[i].flags |=
641 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
643 /* set up G protection */
644 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
645 rate->flags & IEEE80211_RATE_ERP_G)
646 info->control.rates[i].flags |=
647 IEEE80211_TX_RC_USE_CTS_PROTECT;
653 static ieee80211_tx_result debug_noinline
654 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
659 info->control.sta = &tx->sta->sta;
664 static ieee80211_tx_result debug_noinline
665 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
667 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
668 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
674 * Packet injection may want to control the sequence
675 * number, if we have no matching interface then we
676 * neither assign one ourselves nor ask the driver to.
678 if (unlikely(!info->control.vif))
681 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
684 if (ieee80211_hdrlen(hdr->frame_control) < 24)
688 * Anything but QoS data that has a sequence number field
689 * (is long enough) gets a sequence number from the global
692 if (!ieee80211_is_data_qos(hdr->frame_control)) {
693 /* driver should assign sequence number */
694 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
695 /* for pure STA mode without beacons, we can do it */
696 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
697 tx->sdata->sequence_number += 0x10;
698 tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
703 * This should be true for injected/management frames only, for
704 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
705 * above since they are not QoS-data frames.
710 /* include per-STA, per-TID sequence counter */
712 qc = ieee80211_get_qos_ctl(hdr);
713 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
714 seq = &tx->sta->tid_seq[tid];
716 hdr->seq_ctrl = cpu_to_le16(*seq);
718 /* Increase the sequence number. */
719 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
724 static int ieee80211_fragment(struct ieee80211_local *local,
725 struct sk_buff *skb, int hdrlen,
728 struct sk_buff *tail = skb, *tmp;
729 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
730 int pos = hdrlen + per_fragm;
731 int rem = skb->len - hdrlen - per_fragm;
733 if (WARN_ON(rem < 0))
737 int fraglen = per_fragm;
742 tmp = dev_alloc_skb(local->tx_headroom +
744 IEEE80211_ENCRYPT_HEADROOM +
745 IEEE80211_ENCRYPT_TAILROOM);
750 skb_reserve(tmp, local->tx_headroom +
751 IEEE80211_ENCRYPT_HEADROOM);
752 /* copy control information */
753 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
754 skb_copy_queue_mapping(tmp, skb);
755 tmp->priority = skb->priority;
756 tmp->do_not_encrypt = skb->do_not_encrypt;
760 /* copy header and data */
761 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
762 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
767 skb->len = hdrlen + per_fragm;
771 static ieee80211_tx_result debug_noinline
772 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
774 struct sk_buff *skb = tx->skb;
775 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
776 struct ieee80211_hdr *hdr = (void *)skb->data;
777 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
781 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
785 * Warn when submitting a fragmented A-MPDU frame and drop it.
786 * This scenario is handled in __ieee80211_tx_prepare but extra
787 * caution taken here as fragmented ampdu may cause Tx stop.
789 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
792 hdrlen = ieee80211_hdrlen(hdr->frame_control);
794 /* internal error, why is TX_FRAGMENTED set? */
795 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
799 * Now fragment the frame. This will allocate all the fragments and
800 * chain them (using skb as the first fragment) to skb->next.
801 * During transmission, we will remove the successfully transmitted
802 * fragments from this list. When the low-level driver rejects one
803 * of the fragments then we will simply pretend to accept the skb
804 * but store it away as pending.
806 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
809 /* update duration/seq/flags of fragments */
813 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
815 hdr = (void *)skb->data;
816 info = IEEE80211_SKB_CB(skb);
819 hdr->frame_control |= morefrags;
820 next_len = skb->next->len;
822 * No multi-rate retries for fragmented frames, that
823 * would completely throw off the NAV at other STAs.
825 info->control.rates[1].idx = -1;
826 info->control.rates[2].idx = -1;
827 info->control.rates[3].idx = -1;
828 info->control.rates[4].idx = -1;
829 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
830 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
832 hdr->frame_control &= ~morefrags;
835 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
836 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
838 } while ((skb = skb->next));
843 static ieee80211_tx_result debug_noinline
844 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
849 switch (tx->key->conf.alg) {
851 return ieee80211_crypto_wep_encrypt(tx);
853 return ieee80211_crypto_tkip_encrypt(tx);
855 return ieee80211_crypto_ccmp_encrypt(tx);
857 return ieee80211_crypto_aes_cmac_encrypt(tx);
865 static ieee80211_tx_result debug_noinline
866 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
868 struct sk_buff *skb = tx->skb;
869 struct ieee80211_hdr *hdr;
874 hdr = (void *) skb->data;
875 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
876 break; /* must not overwrite AID */
877 next_len = skb->next ? skb->next->len : 0;
878 group_addr = is_multicast_ether_addr(hdr->addr1);
881 ieee80211_duration(tx, group_addr, next_len);
882 } while ((skb = skb->next));
887 static ieee80211_tx_result debug_noinline
888 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
890 struct sk_buff *skb = tx->skb;
895 tx->sta->tx_packets++;
897 tx->sta->tx_fragments++;
898 tx->sta->tx_bytes += skb->len;
899 } while ((skb = skb->next));
904 /* actual transmit path */
907 * deal with packet injection down monitor interface
908 * with Radiotap Header -- only called for monitor mode interface
910 static ieee80211_tx_result
911 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
915 * this is the moment to interpret and discard the radiotap header that
916 * must be at the start of the packet injected in Monitor mode
918 * Need to take some care with endian-ness since radiotap
919 * args are little-endian
922 struct ieee80211_radiotap_iterator iterator;
923 struct ieee80211_radiotap_header *rthdr =
924 (struct ieee80211_radiotap_header *) skb->data;
925 struct ieee80211_supported_band *sband;
926 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
928 sband = tx->local->hw.wiphy->bands[tx->channel->band];
930 skb->do_not_encrypt = 1;
931 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
934 * for every radiotap entry that is present
935 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
936 * entries present, or -EINVAL on error)
940 ret = ieee80211_radiotap_iterator_next(&iterator);
945 /* see if this argument is something we can use */
946 switch (iterator.this_arg_index) {
948 * You must take care when dereferencing iterator.this_arg
949 * for multibyte types... the pointer is not aligned. Use
950 * get_unaligned((type *)iterator.this_arg) to dereference
951 * iterator.this_arg for type "type" safely on all arches.
953 case IEEE80211_RADIOTAP_FLAGS:
954 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
956 * this indicates that the skb we have been
957 * handed has the 32-bit FCS CRC at the end...
958 * we should react to that by snipping it off
959 * because it will be recomputed and added
962 if (skb->len < (iterator.max_length + FCS_LEN))
965 skb_trim(skb, skb->len - FCS_LEN);
967 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
968 tx->skb->do_not_encrypt = 0;
969 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
970 tx->flags |= IEEE80211_TX_FRAGMENTED;
974 * Please update the file
975 * Documentation/networking/mac80211-injection.txt
976 * when parsing new fields here.
984 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
988 * remove the radiotap header
989 * iterator->max_length was sanity-checked against
990 * skb->len by iterator init
992 skb_pull(skb, iterator.max_length);
1000 static ieee80211_tx_result
1001 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
1002 struct sk_buff *skb,
1003 struct net_device *dev)
1005 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1006 struct ieee80211_hdr *hdr;
1007 struct ieee80211_sub_if_data *sdata;
1008 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1011 bool queued = false;
1013 memset(tx, 0, sizeof(*tx));
1015 tx->dev = dev; /* use original interface */
1017 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1018 tx->channel = local->hw.conf.channel;
1020 * Set this flag (used below to indicate "automatic fragmentation"),
1021 * it will be cleared/left by radiotap as desired.
1023 tx->flags |= IEEE80211_TX_FRAGMENTED;
1025 /* process and remove the injection radiotap header */
1026 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1027 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
1028 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
1032 * __ieee80211_parse_tx_radiotap has now removed
1033 * the radiotap header that was present and pre-filled
1034 * 'tx' with tx control information.
1039 * If this flag is set to true anywhere, and we get here,
1040 * we are doing the needed processing, so remove the flag
1043 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1045 hdr = (struct ieee80211_hdr *) skb->data;
1047 tx->sta = sta_info_get(local, hdr->addr1);
1049 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1050 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1051 unsigned long flags;
1052 struct tid_ampdu_tx *tid_tx;
1054 qc = ieee80211_get_qos_ctl(hdr);
1055 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1057 spin_lock_irqsave(&tx->sta->lock, flags);
1059 * XXX: This spinlock could be fairly expensive, but see the
1060 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1061 * One way to solve this would be to do something RCU-like
1062 * for managing the tid_tx struct and using atomic bitops
1063 * for the actual state -- by introducing an actual
1064 * 'operational' bit that would be possible. It would
1065 * require changing ieee80211_agg_tx_operational() to
1066 * set that bit, and changing the way tid_tx is managed
1067 * everywhere, including races between that bit and
1068 * tid_tx going away (tid_tx being added can be easily
1069 * committed to memory before the 'operational' bit).
1071 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1072 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1073 if (*state == HT_AGG_STATE_OPERATIONAL) {
1074 info->flags |= IEEE80211_TX_CTL_AMPDU;
1075 } else if (*state != HT_AGG_STATE_IDLE) {
1078 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1079 __skb_queue_tail(&tid_tx->pending, skb);
1081 spin_unlock_irqrestore(&tx->sta->lock, flags);
1083 if (unlikely(queued))
1087 if (is_multicast_ether_addr(hdr->addr1)) {
1088 tx->flags &= ~IEEE80211_TX_UNICAST;
1089 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1091 tx->flags |= IEEE80211_TX_UNICAST;
1092 if (unlikely(local->wifi_wme_noack_test))
1093 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1095 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1098 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1099 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1100 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1101 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1102 tx->flags |= IEEE80211_TX_FRAGMENTED;
1104 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1108 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1109 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1110 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1112 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1113 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1114 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1115 tx->ethertype = (pos[0] << 8) | pos[1];
1117 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1123 * NB: @tx is uninitialised when passed in here
1125 static int ieee80211_tx_prepare(struct ieee80211_local *local,
1126 struct ieee80211_tx_data *tx,
1127 struct sk_buff *skb)
1129 struct net_device *dev;
1131 dev = dev_get_by_index(&init_net, skb->iif);
1132 if (unlikely(dev && !is_ieee80211_device(local, dev))) {
1139 * initialises tx with control
1141 * return value is safe to ignore here because this function
1142 * can only be invoked for multicast frames
1146 __ieee80211_tx_prepare(tx, skb, dev);
1151 static int __ieee80211_tx(struct ieee80211_local *local,
1152 struct sk_buff **skbp,
1153 struct sta_info *sta)
1155 struct sk_buff *skb = *skbp, *next;
1156 struct ieee80211_tx_info *info;
1160 local->mdev->trans_start = jiffies;
1163 if (ieee80211_queue_stopped(&local->hw,
1164 skb_get_queue_mapping(skb)))
1165 return IEEE80211_TX_PENDING;
1167 info = IEEE80211_SKB_CB(skb);
1170 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1171 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1175 ret = drv_tx(local, skb);
1176 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1180 if (ret != NETDEV_TX_OK)
1181 return IEEE80211_TX_AGAIN;
1183 ieee80211_led_tx(local, 1);
1187 return IEEE80211_TX_OK;
1191 * Invoke TX handlers, return 0 on success and non-zero if the
1192 * frame was dropped or queued.
1194 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1196 struct sk_buff *skb = tx->skb;
1197 ieee80211_tx_result res = TX_DROP;
1199 #define CALL_TXH(txh) \
1201 if (res != TX_CONTINUE) \
1204 CALL_TXH(ieee80211_tx_h_check_assoc)
1205 CALL_TXH(ieee80211_tx_h_ps_buf)
1206 CALL_TXH(ieee80211_tx_h_select_key)
1207 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1208 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1209 CALL_TXH(ieee80211_tx_h_misc)
1210 CALL_TXH(ieee80211_tx_h_sequence)
1211 CALL_TXH(ieee80211_tx_h_fragment)
1212 /* handlers after fragment must be aware of tx info fragmentation! */
1213 CALL_TXH(ieee80211_tx_h_encrypt)
1214 CALL_TXH(ieee80211_tx_h_calculate_duration)
1215 CALL_TXH(ieee80211_tx_h_stats)
1219 if (unlikely(res == TX_DROP)) {
1220 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1222 struct sk_buff *next;
1229 } else if (unlikely(res == TX_QUEUED)) {
1230 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1237 static void ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1240 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1241 struct sta_info *sta;
1242 struct ieee80211_tx_data tx;
1243 ieee80211_tx_result res_prepare;
1244 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1245 struct sk_buff *next;
1246 unsigned long flags;
1250 queue = skb_get_queue_mapping(skb);
1252 WARN_ON(!txpending && !skb_queue_empty(&local->pending[queue]));
1254 if (unlikely(skb->len < 10)) {
1261 /* initialises tx */
1262 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1264 if (unlikely(res_prepare == TX_DROP)) {
1268 } else if (unlikely(res_prepare == TX_QUEUED)) {
1274 tx.channel = local->hw.conf.channel;
1275 info->band = tx.channel->band;
1277 if (invoke_tx_handlers(&tx))
1282 ret = __ieee80211_tx(local, &tx.skb, tx.sta);
1284 case IEEE80211_TX_OK:
1286 case IEEE80211_TX_AGAIN:
1288 * Since there are no fragmented frames on A-MPDU
1289 * queues, there's no reason for a driver to reject
1290 * a frame there, warn and drop it.
1292 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1295 case IEEE80211_TX_PENDING:
1298 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1300 if (__netif_subqueue_stopped(local->mdev, queue)) {
1304 if (unlikely(txpending))
1305 skb_queue_head(&local->pending[queue],
1308 skb_queue_tail(&local->pending[queue],
1310 } while ((skb = next));
1313 * Make sure nobody will enable the queue on us
1314 * (without going through the tasklet) nor disable the
1315 * netdev queue underneath the pending handling code.
1317 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING,
1318 &local->queue_stop_reasons[queue]);
1320 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1323 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1327 if (WARN(retries > 10, "tx refused but queue active"))
1347 /* device xmit handlers */
1349 static int ieee80211_skb_resize(struct ieee80211_local *local,
1350 struct sk_buff *skb,
1351 int head_need, bool may_encrypt)
1356 * This could be optimised, devices that do full hardware
1357 * crypto (including TKIP MMIC) need no tailroom... But we
1358 * have no drivers for such devices currently.
1361 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1362 tail_need -= skb_tailroom(skb);
1363 tail_need = max_t(int, tail_need, 0);
1366 if (head_need || tail_need) {
1367 /* Sorry. Can't account for this any more */
1371 if (skb_header_cloned(skb))
1372 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1374 I802_DEBUG_INC(local->tx_expand_skb_head);
1376 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1377 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1378 wiphy_name(local->hw.wiphy));
1382 /* update truesize too */
1383 skb->truesize += head_need + tail_need;
1388 int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
1390 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
1391 struct ieee80211_local *local = mpriv->local;
1392 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1393 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1394 struct net_device *odev = NULL;
1395 struct ieee80211_sub_if_data *osdata;
1402 } monitor_iface = NOT_MONITOR;
1405 odev = dev_get_by_index(&init_net, skb->iif);
1406 if (unlikely(odev && !is_ieee80211_device(local, odev))) {
1410 if (unlikely(!odev)) {
1411 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1412 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1413 "originating device\n", dev->name);
1416 return NETDEV_TX_OK;
1419 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1420 local->hw.conf.dynamic_ps_timeout > 0) {
1421 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1422 ieee80211_stop_queues_by_reason(&local->hw,
1423 IEEE80211_QUEUE_STOP_REASON_PS);
1424 queue_work(local->hw.workqueue,
1425 &local->dynamic_ps_disable_work);
1428 mod_timer(&local->dynamic_ps_timer, jiffies +
1429 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1432 memset(info, 0, sizeof(*info));
1434 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1436 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1438 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1439 ieee80211_is_data(hdr->frame_control)) {
1440 if (is_multicast_ether_addr(hdr->addr3))
1441 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1443 if (mesh_nexthop_lookup(skb, osdata)) {
1445 return NETDEV_TX_OK;
1447 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1448 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1450 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1451 struct ieee80211_sub_if_data *sdata;
1455 info->flags |= IEEE80211_TX_CTL_INJECTED;
1456 monitor_iface = UNKNOWN_ADDRESS;
1458 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1459 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1460 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1462 /* check the header is complete in the frame */
1463 if (likely(skb->len >= len_rthdr + hdrlen)) {
1465 * We process outgoing injected frames that have a
1466 * local address we handle as though they are our
1468 * This code here isn't entirely correct, the local
1469 * MAC address is not necessarily enough to find
1470 * the interface to use; for that proper VLAN/WDS
1471 * support we will need a different mechanism.
1475 list_for_each_entry_rcu(sdata, &local->interfaces,
1477 if (!netif_running(sdata->dev))
1479 if (sdata->vif.type != NL80211_IFTYPE_AP)
1481 if (compare_ether_addr(sdata->dev->dev_addr,
1483 dev_hold(sdata->dev);
1487 skb->iif = sdata->dev->ifindex;
1488 monitor_iface = FOUND_SDATA;
1496 may_encrypt = !skb->do_not_encrypt;
1498 headroom = osdata->local->tx_headroom;
1500 headroom += IEEE80211_ENCRYPT_HEADROOM;
1501 headroom -= skb_headroom(skb);
1502 headroom = max_t(int, 0, headroom);
1504 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1507 return NETDEV_TX_OK;
1510 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1511 osdata = container_of(osdata->bss,
1512 struct ieee80211_sub_if_data,
1514 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1515 info->control.vif = &osdata->vif;
1517 ieee80211_tx(odev, skb, false);
1520 return NETDEV_TX_OK;
1523 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1524 struct net_device *dev)
1526 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1527 struct ieee80211_channel *chan = local->hw.conf.channel;
1528 struct ieee80211_radiotap_header *prthdr =
1529 (struct ieee80211_radiotap_header *)skb->data;
1533 * Frame injection is not allowed if beaconing is not allowed
1534 * or if we need radar detection. Beaconing is usually not allowed when
1535 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1536 * Passive scan is also used in world regulatory domains where
1537 * your country is not known and as such it should be treated as
1538 * NO TX unless the channel is explicitly allowed in which case
1539 * your current regulatory domain would not have the passive scan
1542 * Since AP mode uses monitor interfaces to inject/TX management
1543 * frames we can make AP mode the exception to this rule once it
1544 * supports radar detection as its implementation can deal with
1545 * radar detection by itself. We can do that later by adding a
1546 * monitor flag interfaces used for AP support.
1548 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1549 IEEE80211_CHAN_PASSIVE_SCAN)))
1552 /* check for not even having the fixed radiotap header part */
1553 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1554 goto fail; /* too short to be possibly valid */
1556 /* is it a header version we can trust to find length from? */
1557 if (unlikely(prthdr->it_version))
1558 goto fail; /* only version 0 is supported */
1560 /* then there must be a radiotap header with a length we can use */
1561 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1563 /* does the skb contain enough to deliver on the alleged length? */
1564 if (unlikely(skb->len < len_rthdr))
1565 goto fail; /* skb too short for claimed rt header extent */
1567 skb->dev = local->mdev;
1569 /* needed because we set skb device to master */
1570 skb->iif = dev->ifindex;
1572 /* sometimes we do encrypt injected frames, will be fixed
1573 * up in radiotap parser if not wanted */
1574 skb->do_not_encrypt = 0;
1577 * fix up the pointers accounting for the radiotap
1578 * header still being in there. We are being given
1579 * a precooked IEEE80211 header so no need for
1582 skb_set_mac_header(skb, len_rthdr);
1584 * these are just fixed to the end of the rt area since we
1585 * don't have any better information and at this point, nobody cares
1587 skb_set_network_header(skb, len_rthdr);
1588 skb_set_transport_header(skb, len_rthdr);
1590 /* pass the radiotap header up to the next stage intact */
1591 dev_queue_xmit(skb);
1592 return NETDEV_TX_OK;
1596 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1600 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1601 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1602 * @skb: packet to be sent
1603 * @dev: incoming interface
1605 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1606 * not be freed, and caller is responsible for either retrying later or freeing
1609 * This function takes in an Ethernet header and encapsulates it with suitable
1610 * IEEE 802.11 header based on which interface the packet is coming in. The
1611 * encapsulated packet will then be passed to master interface, wlan#.11, for
1612 * transmission (through low-level driver).
1614 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1615 struct net_device *dev)
1617 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1618 struct ieee80211_local *local = sdata->local;
1619 int ret = 1, head_need;
1620 u16 ethertype, hdrlen, meshhdrlen = 0;
1622 struct ieee80211_hdr hdr;
1623 struct ieee80211s_hdr mesh_hdr;
1624 const u8 *encaps_data;
1625 int encaps_len, skip_header_bytes;
1627 struct sta_info *sta;
1630 if (unlikely(skb->len < ETH_HLEN)) {
1635 nh_pos = skb_network_header(skb) - skb->data;
1636 h_pos = skb_transport_header(skb) - skb->data;
1638 /* convert Ethernet header to proper 802.11 header (based on
1639 * operation mode) */
1640 ethertype = (skb->data[12] << 8) | skb->data[13];
1641 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1643 switch (sdata->vif.type) {
1644 case NL80211_IFTYPE_AP:
1645 case NL80211_IFTYPE_AP_VLAN:
1646 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1648 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1649 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1650 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1653 case NL80211_IFTYPE_WDS:
1654 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1656 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1657 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1658 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1659 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1662 #ifdef CONFIG_MAC80211_MESH
1663 case NL80211_IFTYPE_MESH_POINT:
1664 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1665 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1666 /* Do not send frames with mesh_ttl == 0 */
1667 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1671 memset(&mesh_hdr, 0, sizeof(mesh_hdr));
1673 if (compare_ether_addr(dev->dev_addr,
1674 skb->data + ETH_ALEN) == 0) {
1676 memset(hdr.addr1, 0, ETH_ALEN);
1677 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1678 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1679 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1680 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1682 /* packet from other interface */
1683 struct mesh_path *mppath;
1685 memset(hdr.addr1, 0, ETH_ALEN);
1686 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1687 memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN);
1689 if (is_multicast_ether_addr(skb->data))
1690 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1693 mppath = mpp_path_lookup(skb->data, sdata);
1695 memcpy(hdr.addr3, mppath->mpp, ETH_ALEN);
1697 memset(hdr.addr3, 0xff, ETH_ALEN);
1701 mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6;
1702 mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
1703 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum);
1704 memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN);
1705 memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN);
1706 sdata->u.mesh.mesh_seqnum++;
1712 case NL80211_IFTYPE_STATION:
1713 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1715 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1716 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1717 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1720 case NL80211_IFTYPE_ADHOC:
1722 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1723 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1724 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1733 * There's no need to try to look up the destination
1734 * if it is a multicast address (which can only happen
1737 if (!is_multicast_ether_addr(hdr.addr1)) {
1739 sta = sta_info_get(local, hdr.addr1);
1741 sta_flags = get_sta_flags(sta);
1745 /* receiver and we are QoS enabled, use a QoS type frame */
1746 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1747 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1752 * Drop unicast frames to unauthorised stations unless they are
1753 * EAPOL frames from the local station.
1755 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1756 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1757 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1758 !(ethertype == ETH_P_PAE &&
1759 compare_ether_addr(dev->dev_addr,
1760 skb->data + ETH_ALEN) == 0))) {
1761 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1762 if (net_ratelimit())
1763 printk(KERN_DEBUG "%s: dropped frame to %pM"
1764 " (unauthorized port)\n", dev->name,
1768 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1774 hdr.frame_control = fc;
1775 hdr.duration_id = 0;
1778 skip_header_bytes = ETH_HLEN;
1779 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1780 encaps_data = bridge_tunnel_header;
1781 encaps_len = sizeof(bridge_tunnel_header);
1782 skip_header_bytes -= 2;
1783 } else if (ethertype >= 0x600) {
1784 encaps_data = rfc1042_header;
1785 encaps_len = sizeof(rfc1042_header);
1786 skip_header_bytes -= 2;
1792 skb_pull(skb, skip_header_bytes);
1793 nh_pos -= skip_header_bytes;
1794 h_pos -= skip_header_bytes;
1796 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1799 * So we need to modify the skb header and hence need a copy of
1800 * that. The head_need variable above doesn't, so far, include
1801 * the needed header space that we don't need right away. If we
1802 * can, then we don't reallocate right now but only after the
1803 * frame arrives at the master device (if it does...)
1805 * If we cannot, however, then we will reallocate to include all
1806 * the ever needed space. Also, if we need to reallocate it anyway,
1807 * make it big enough for everything we may ever need.
1810 if (head_need > 0 || skb_cloned(skb)) {
1811 head_need += IEEE80211_ENCRYPT_HEADROOM;
1812 head_need += local->tx_headroom;
1813 head_need = max_t(int, 0, head_need);
1814 if (ieee80211_skb_resize(local, skb, head_need, true))
1819 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1820 nh_pos += encaps_len;
1821 h_pos += encaps_len;
1824 if (meshhdrlen > 0) {
1825 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1826 nh_pos += meshhdrlen;
1827 h_pos += meshhdrlen;
1830 if (ieee80211_is_data_qos(fc)) {
1831 __le16 *qos_control;
1833 qos_control = (__le16*) skb_push(skb, 2);
1834 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1836 * Maybe we could actually set some fields here, for now just
1837 * initialise to zero to indicate no special operation.
1841 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1846 skb->iif = dev->ifindex;
1848 skb->dev = local->mdev;
1849 dev->stats.tx_packets++;
1850 dev->stats.tx_bytes += skb->len;
1852 /* Update skb pointers to various headers since this modified frame
1853 * is going to go through Linux networking code that may potentially
1854 * need things like pointer to IP header. */
1855 skb_set_mac_header(skb, 0);
1856 skb_set_network_header(skb, nh_pos);
1857 skb_set_transport_header(skb, h_pos);
1859 dev->trans_start = jiffies;
1860 dev_queue_xmit(skb);
1873 * ieee80211_clear_tx_pending may not be called in a context where
1874 * it is possible that it packets could come in again.
1876 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1880 for (i = 0; i < local->hw.queues; i++)
1881 skb_queue_purge(&local->pending[i]);
1884 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
1885 struct sk_buff *skb)
1887 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1888 struct ieee80211_sub_if_data *sdata;
1889 struct sta_info *sta;
1890 struct ieee80211_hdr *hdr;
1891 struct net_device *dev;
1895 /* does interface still exist? */
1896 dev = dev_get_by_index(&init_net, skb->iif);
1902 /* validate info->control.vif against skb->iif */
1903 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1904 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1905 sdata = container_of(sdata->bss,
1906 struct ieee80211_sub_if_data,
1909 if (unlikely(info->control.vif && info->control.vif != &sdata->vif)) {
1915 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
1916 ieee80211_tx(dev, skb, true);
1918 hdr = (struct ieee80211_hdr *)skb->data;
1919 sta = sta_info_get(local, hdr->addr1);
1921 ret = __ieee80211_tx(local, &skb, sta);
1922 if (ret != IEEE80211_TX_OK)
1933 * Transmit all pending packets. Called from tasklet, locks master device
1934 * TX lock so that no new packets can come in.
1936 void ieee80211_tx_pending(unsigned long data)
1938 struct ieee80211_local *local = (struct ieee80211_local *)data;
1939 struct net_device *dev = local->mdev;
1940 unsigned long flags;
1945 netif_tx_lock_bh(dev);
1947 for (i = 0; i < local->hw.queues; i++) {
1949 * If queue is stopped by something other than due to pending
1950 * frames, or we have no pending frames, proceed to next queue.
1952 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1954 if (local->queue_stop_reasons[i] !=
1955 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING) ||
1956 skb_queue_empty(&local->pending[i]))
1958 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1964 * start the queue now to allow processing our packets,
1965 * we're under the tx lock here anyway so nothing will
1966 * happen as a result of this
1968 netif_start_subqueue(local->mdev, i);
1970 while (!skb_queue_empty(&local->pending[i])) {
1971 struct sk_buff *skb = skb_dequeue(&local->pending[i]);
1973 if (!ieee80211_tx_pending_skb(local, skb)) {
1974 skb_queue_head(&local->pending[i], skb);
1979 /* Start regular packet processing again. */
1980 if (skb_queue_empty(&local->pending[i]))
1981 ieee80211_wake_queue_by_reason(&local->hw, i,
1982 IEEE80211_QUEUE_STOP_REASON_PENDING);
1985 netif_tx_unlock_bh(dev);
1989 /* functions for drivers to get certain frames */
1991 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
1992 struct sk_buff *skb,
1993 struct beacon_data *beacon)
1997 int i, have_bits = 0, n1, n2;
1999 /* Generate bitmap for TIM only if there are any STAs in power save
2001 if (atomic_read(&bss->num_sta_ps) > 0)
2002 /* in the hope that this is faster than
2003 * checking byte-for-byte */
2004 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2005 IEEE80211_MAX_AID+1);
2007 if (bss->dtim_count == 0)
2008 bss->dtim_count = beacon->dtim_period - 1;
2012 tim = pos = (u8 *) skb_put(skb, 6);
2013 *pos++ = WLAN_EID_TIM;
2015 *pos++ = bss->dtim_count;
2016 *pos++ = beacon->dtim_period;
2018 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2022 /* Find largest even number N1 so that bits numbered 1 through
2023 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2024 * (N2 + 1) x 8 through 2007 are 0. */
2026 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2033 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2040 /* Bitmap control */
2042 /* Part Virt Bitmap */
2043 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2045 tim[1] = n2 - n1 + 4;
2046 skb_put(skb, n2 - n1);
2048 *pos++ = aid0; /* Bitmap control */
2049 *pos++ = 0; /* Part Virt Bitmap */
2053 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
2054 struct ieee80211_vif *vif)
2056 struct ieee80211_local *local = hw_to_local(hw);
2057 struct sk_buff *skb = NULL;
2058 struct ieee80211_tx_info *info;
2059 struct ieee80211_sub_if_data *sdata = NULL;
2060 struct ieee80211_if_ap *ap = NULL;
2061 struct beacon_data *beacon;
2062 struct ieee80211_supported_band *sband;
2063 enum ieee80211_band band = local->hw.conf.channel->band;
2065 sband = local->hw.wiphy->bands[band];
2069 sdata = vif_to_sdata(vif);
2071 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2073 beacon = rcu_dereference(ap->beacon);
2076 * headroom, head length,
2077 * tail length and maximum TIM length
2079 skb = dev_alloc_skb(local->tx_headroom +
2081 beacon->tail_len + 256);
2085 skb_reserve(skb, local->tx_headroom);
2086 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2090 * Not very nice, but we want to allow the driver to call
2091 * ieee80211_beacon_get() as a response to the set_tim()
2092 * callback. That, however, is already invoked under the
2093 * sta_lock to guarantee consistent and race-free update
2094 * of the tim bitmap in mac80211 and the driver.
2096 if (local->tim_in_locked_section) {
2097 ieee80211_beacon_add_tim(ap, skb, beacon);
2099 unsigned long flags;
2101 spin_lock_irqsave(&local->sta_lock, flags);
2102 ieee80211_beacon_add_tim(ap, skb, beacon);
2103 spin_unlock_irqrestore(&local->sta_lock, flags);
2107 memcpy(skb_put(skb, beacon->tail_len),
2108 beacon->tail, beacon->tail_len);
2111 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2112 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2113 struct ieee80211_hdr *hdr;
2114 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2119 skb = skb_copy(presp, GFP_ATOMIC);
2123 hdr = (struct ieee80211_hdr *) skb->data;
2124 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2125 IEEE80211_STYPE_BEACON);
2126 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2127 struct ieee80211_mgmt *mgmt;
2130 /* headroom, head length, tail length and maximum TIM length */
2131 skb = dev_alloc_skb(local->tx_headroom + 400);
2135 skb_reserve(skb, local->hw.extra_tx_headroom);
2136 mgmt = (struct ieee80211_mgmt *)
2137 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2138 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2139 mgmt->frame_control =
2140 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2141 memset(mgmt->da, 0xff, ETH_ALEN);
2142 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2143 /* BSSID is left zeroed, wildcard value */
2144 mgmt->u.beacon.beacon_int =
2145 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2146 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2148 pos = skb_put(skb, 2);
2149 *pos++ = WLAN_EID_SSID;
2152 mesh_mgmt_ies_add(skb, sdata);
2158 info = IEEE80211_SKB_CB(skb);
2160 skb->do_not_encrypt = 1;
2164 * XXX: For now, always use the lowest rate
2166 info->control.rates[0].idx = 0;
2167 info->control.rates[0].count = 1;
2168 info->control.rates[1].idx = -1;
2169 info->control.rates[2].idx = -1;
2170 info->control.rates[3].idx = -1;
2171 info->control.rates[4].idx = -1;
2172 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
2174 info->control.vif = vif;
2176 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2177 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
2178 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2183 EXPORT_SYMBOL(ieee80211_beacon_get);
2185 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2186 const void *frame, size_t frame_len,
2187 const struct ieee80211_tx_info *frame_txctl,
2188 struct ieee80211_rts *rts)
2190 const struct ieee80211_hdr *hdr = frame;
2192 rts->frame_control =
2193 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2194 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2196 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2197 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2199 EXPORT_SYMBOL(ieee80211_rts_get);
2201 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2202 const void *frame, size_t frame_len,
2203 const struct ieee80211_tx_info *frame_txctl,
2204 struct ieee80211_cts *cts)
2206 const struct ieee80211_hdr *hdr = frame;
2208 cts->frame_control =
2209 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2210 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2211 frame_len, frame_txctl);
2212 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2214 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2217 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2218 struct ieee80211_vif *vif)
2220 struct ieee80211_local *local = hw_to_local(hw);
2221 struct sk_buff *skb = NULL;
2222 struct sta_info *sta;
2223 struct ieee80211_tx_data tx;
2224 struct ieee80211_sub_if_data *sdata;
2225 struct ieee80211_if_ap *bss = NULL;
2226 struct beacon_data *beacon;
2227 struct ieee80211_tx_info *info;
2229 sdata = vif_to_sdata(vif);
2236 beacon = rcu_dereference(bss->beacon);
2238 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2241 if (bss->dtim_count != 0)
2242 goto out; /* send buffered bc/mc only after DTIM beacon */
2245 skb = skb_dequeue(&bss->ps_bc_buf);
2248 local->total_ps_buffered--;
2250 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2251 struct ieee80211_hdr *hdr =
2252 (struct ieee80211_hdr *) skb->data;
2253 /* more buffered multicast/broadcast frames ==> set
2254 * MoreData flag in IEEE 802.11 header to inform PS
2256 hdr->frame_control |=
2257 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2260 if (!ieee80211_tx_prepare(local, &tx, skb))
2262 dev_kfree_skb_any(skb);
2265 info = IEEE80211_SKB_CB(skb);
2268 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2269 tx.channel = local->hw.conf.channel;
2270 info->band = tx.channel->band;
2272 if (invoke_tx_handlers(&tx))
2279 EXPORT_SYMBOL(ieee80211_get_buffered_bc);