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_PENDING 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) &&
196 !ieee80211_is_nullfunc(hdr->frame_control))
198 * When software scanning only nullfunc frames (to notify
199 * the sleep state to the AP) and probe requests (for the
200 * active scan) are allowed, all other frames should not be
201 * sent and we should not get here, but if we do
202 * nonetheless, drop them to avoid sending them
203 * off-channel. See the link below and
204 * ieee80211_start_scan() for more.
206 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
210 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
213 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
216 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
218 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
219 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
220 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
221 ieee80211_is_data(hdr->frame_control))) {
222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
223 printk(KERN_DEBUG "%s: dropped data frame to not "
224 "associated station %pM\n",
225 tx->dev->name, hdr->addr1);
226 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
227 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
231 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
232 tx->local->num_sta == 0 &&
233 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
235 * No associated STAs - no need to send multicast
246 /* This function is called whenever the AP is about to exceed the maximum limit
247 * of buffered frames for power saving STAs. This situation should not really
248 * happen often during normal operation, so dropping the oldest buffered packet
249 * from each queue should be OK to make some room for new frames. */
250 static void purge_old_ps_buffers(struct ieee80211_local *local)
252 int total = 0, purged = 0;
254 struct ieee80211_sub_if_data *sdata;
255 struct sta_info *sta;
258 * virtual interfaces are protected by RCU
262 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
263 struct ieee80211_if_ap *ap;
264 if (sdata->vif.type != NL80211_IFTYPE_AP)
267 skb = skb_dequeue(&ap->ps_bc_buf);
272 total += skb_queue_len(&ap->ps_bc_buf);
275 list_for_each_entry_rcu(sta, &local->sta_list, list) {
276 skb = skb_dequeue(&sta->ps_tx_buf);
281 total += skb_queue_len(&sta->ps_tx_buf);
286 local->total_ps_buffered = total;
287 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
288 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
289 wiphy_name(local->hw.wiphy), purged);
293 static ieee80211_tx_result
294 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
300 * broadcast/multicast frame
302 * If any of the associated stations is in power save mode,
303 * the frame is buffered to be sent after DTIM beacon frame.
304 * This is done either by the hardware or us.
307 /* powersaving STAs only in AP/VLAN mode */
311 /* no buffering for ordered frames */
312 if (ieee80211_has_order(hdr->frame_control))
315 /* no stations in PS mode */
316 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
319 /* buffered in mac80211 */
320 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
321 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
322 purge_old_ps_buffers(tx->local);
323 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
325 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
326 if (net_ratelimit()) {
327 printk(KERN_DEBUG "%s: BC TX buffer full - "
328 "dropping the oldest frame\n",
332 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
334 tx->local->total_ps_buffered++;
335 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
339 /* buffered in hardware */
340 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
345 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
348 if (!ieee80211_is_mgmt(fc))
351 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
354 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
361 static ieee80211_tx_result
362 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
364 struct sta_info *sta = tx->sta;
365 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
369 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
372 staflags = get_sta_flags(sta);
374 if (unlikely((staflags & WLAN_STA_PS) &&
375 !(staflags & WLAN_STA_PSPOLL))) {
376 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
377 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
379 sta->sta.addr, sta->sta.aid,
380 skb_queue_len(&sta->ps_tx_buf));
381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
382 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
383 purge_old_ps_buffers(tx->local);
384 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
385 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
386 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
387 if (net_ratelimit()) {
388 printk(KERN_DEBUG "%s: STA %pM TX "
389 "buffer full - dropping oldest frame\n",
390 tx->dev->name, sta->sta.addr);
395 tx->local->total_ps_buffered++;
397 /* Queue frame to be sent after STA sends an PS Poll frame */
398 if (skb_queue_empty(&sta->ps_tx_buf))
399 sta_info_set_tim_bit(sta);
401 info->control.jiffies = jiffies;
402 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
405 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
406 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
407 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
408 "set -> send frame\n", tx->dev->name,
411 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
412 clear_sta_flags(sta, WLAN_STA_PSPOLL);
417 static ieee80211_tx_result debug_noinline
418 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
420 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
423 if (tx->flags & IEEE80211_TX_UNICAST)
424 return ieee80211_tx_h_unicast_ps_buf(tx);
426 return ieee80211_tx_h_multicast_ps_buf(tx);
429 static ieee80211_tx_result debug_noinline
430 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
432 struct ieee80211_key *key;
433 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
434 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
436 if (unlikely(tx->skb->do_not_encrypt))
438 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
440 else if (ieee80211_is_mgmt(hdr->frame_control) &&
441 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
443 else if ((key = rcu_dereference(tx->sdata->default_key)))
445 else if (tx->sdata->drop_unencrypted &&
446 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
447 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
448 (!ieee80211_is_robust_mgmt_frame(hdr) ||
449 (ieee80211_is_action(hdr->frame_control) &&
450 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
451 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
457 tx->key->tx_rx_count++;
458 /* TODO: add threshold stuff again */
460 switch (tx->key->conf.alg) {
462 if (ieee80211_is_auth(hdr->frame_control))
465 if (!ieee80211_is_data_present(hdr->frame_control))
469 if (!ieee80211_is_data_present(hdr->frame_control) &&
470 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
475 if (!ieee80211_is_mgmt(hdr->frame_control))
481 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
482 tx->skb->do_not_encrypt = 1;
487 static ieee80211_tx_result debug_noinline
488 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
490 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
491 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
492 struct ieee80211_supported_band *sband;
493 struct ieee80211_rate *rate;
495 bool inval = false, rts = false, short_preamble = false;
496 struct ieee80211_tx_rate_control txrc;
498 memset(&txrc, 0, sizeof(txrc));
500 sband = tx->local->hw.wiphy->bands[tx->channel->band];
502 len = min_t(int, tx->skb->len + FCS_LEN,
503 tx->local->fragmentation_threshold);
505 /* set up the tx rate control struct we give the RC algo */
506 txrc.hw = local_to_hw(tx->local);
508 txrc.bss_conf = &tx->sdata->vif.bss_conf;
510 txrc.reported_rate.idx = -1;
511 txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
513 /* set up RTS protection if desired */
514 if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD &&
515 len > tx->local->rts_threshold) {
516 txrc.rts = rts = true;
520 * Use short preamble if the BSS can handle it, but not for
521 * management frames unless we know the receiver can handle
522 * that -- the management frame might be to a station that
523 * just wants a probe response.
525 if (tx->sdata->vif.bss_conf.use_short_preamble &&
526 (ieee80211_is_data(hdr->frame_control) ||
527 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
528 txrc.short_preamble = short_preamble = true;
531 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
533 if (unlikely(info->control.rates[0].idx < 0))
536 if (txrc.reported_rate.idx < 0)
537 txrc.reported_rate = info->control.rates[0];
540 tx->sta->last_tx_rate = txrc.reported_rate;
542 if (unlikely(!info->control.rates[0].count))
543 info->control.rates[0].count = 1;
545 if (is_multicast_ether_addr(hdr->addr1)) {
547 * XXX: verify the rate is in the basic rateset
553 * set up the RTS/CTS rate as the fastest basic rate
554 * that is not faster than the data rate
556 * XXX: Should this check all retry rates?
558 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
561 rate = &sband->bitrates[info->control.rates[0].idx];
563 for (i = 0; i < sband->n_bitrates; i++) {
564 /* must be a basic rate */
565 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
567 /* must not be faster than the data rate */
568 if (sband->bitrates[i].bitrate > rate->bitrate)
571 if (sband->bitrates[baserate].bitrate <
572 sband->bitrates[i].bitrate)
576 info->control.rts_cts_rate_idx = baserate;
579 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
581 * make sure there's no valid rate following
582 * an invalid one, just in case drivers don't
583 * take the API seriously to stop at -1.
586 info->control.rates[i].idx = -1;
589 if (info->control.rates[i].idx < 0) {
595 * For now assume MCS is already set up correctly, this
598 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
599 WARN_ON(info->control.rates[i].idx > 76);
603 /* set up RTS protection if desired */
605 info->control.rates[i].flags |=
606 IEEE80211_TX_RC_USE_RTS_CTS;
609 if (WARN_ON_ONCE(info->control.rates[i].idx >=
610 sband->n_bitrates)) {
611 info->control.rates[i].idx = -1;
615 rate = &sband->bitrates[info->control.rates[i].idx];
617 /* set up short preamble */
618 if (short_preamble &&
619 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
620 info->control.rates[i].flags |=
621 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
623 /* set up G protection */
624 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
625 rate->flags & IEEE80211_RATE_ERP_G)
626 info->control.rates[i].flags |=
627 IEEE80211_TX_RC_USE_CTS_PROTECT;
633 static ieee80211_tx_result debug_noinline
634 ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
636 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
639 info->control.sta = &tx->sta->sta;
644 static ieee80211_tx_result debug_noinline
645 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
647 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
648 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
654 * Packet injection may want to control the sequence
655 * number, if we have no matching interface then we
656 * neither assign one ourselves nor ask the driver to.
658 if (unlikely(!info->control.vif))
661 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
664 if (ieee80211_hdrlen(hdr->frame_control) < 24)
668 * Anything but QoS data that has a sequence number field
669 * (is long enough) gets a sequence number from the global
672 if (!ieee80211_is_data_qos(hdr->frame_control)) {
673 /* driver should assign sequence number */
674 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
675 /* for pure STA mode without beacons, we can do it */
676 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
677 tx->sdata->sequence_number += 0x10;
678 tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
683 * This should be true for injected/management frames only, for
684 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
685 * above since they are not QoS-data frames.
690 /* include per-STA, per-TID sequence counter */
692 qc = ieee80211_get_qos_ctl(hdr);
693 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
694 seq = &tx->sta->tid_seq[tid];
696 hdr->seq_ctrl = cpu_to_le16(*seq);
698 /* Increase the sequence number. */
699 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
704 static int ieee80211_fragment(struct ieee80211_local *local,
705 struct sk_buff *skb, int hdrlen,
708 struct sk_buff *tail = skb, *tmp;
709 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
710 int pos = hdrlen + per_fragm;
711 int rem = skb->len - hdrlen - per_fragm;
713 if (WARN_ON(rem < 0))
717 int fraglen = per_fragm;
722 tmp = dev_alloc_skb(local->tx_headroom +
724 IEEE80211_ENCRYPT_HEADROOM +
725 IEEE80211_ENCRYPT_TAILROOM);
730 skb_reserve(tmp, local->tx_headroom +
731 IEEE80211_ENCRYPT_HEADROOM);
732 /* copy control information */
733 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
734 skb_copy_queue_mapping(tmp, skb);
735 tmp->priority = skb->priority;
736 tmp->do_not_encrypt = skb->do_not_encrypt;
740 /* copy header and data */
741 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
742 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
747 skb->len = hdrlen + per_fragm;
751 static ieee80211_tx_result debug_noinline
752 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
754 struct sk_buff *skb = tx->skb;
755 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
756 struct ieee80211_hdr *hdr = (void *)skb->data;
757 int frag_threshold = tx->local->fragmentation_threshold;
761 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
765 * Warn when submitting a fragmented A-MPDU frame and drop it.
766 * This scenario is handled in __ieee80211_tx_prepare but extra
767 * caution taken here as fragmented ampdu may cause Tx stop.
769 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
772 hdrlen = ieee80211_hdrlen(hdr->frame_control);
774 /* internal error, why is TX_FRAGMENTED set? */
775 if (WARN_ON(skb->len <= frag_threshold))
779 * Now fragment the frame. This will allocate all the fragments and
780 * chain them (using skb as the first fragment) to skb->next.
781 * During transmission, we will remove the successfully transmitted
782 * fragments from this list. When the low-level driver rejects one
783 * of the fragments then we will simply pretend to accept the skb
784 * but store it away as pending.
786 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
789 /* update duration/seq/flags of fragments */
793 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
795 hdr = (void *)skb->data;
796 info = IEEE80211_SKB_CB(skb);
799 hdr->frame_control |= morefrags;
800 next_len = skb->next->len;
802 * No multi-rate retries for fragmented frames, that
803 * would completely throw off the NAV at other STAs.
805 info->control.rates[1].idx = -1;
806 info->control.rates[2].idx = -1;
807 info->control.rates[3].idx = -1;
808 info->control.rates[4].idx = -1;
809 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
810 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
812 hdr->frame_control &= ~morefrags;
815 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
816 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
818 } while ((skb = skb->next));
823 static ieee80211_tx_result debug_noinline
824 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
829 switch (tx->key->conf.alg) {
831 return ieee80211_crypto_wep_encrypt(tx);
833 return ieee80211_crypto_tkip_encrypt(tx);
835 return ieee80211_crypto_ccmp_encrypt(tx);
837 return ieee80211_crypto_aes_cmac_encrypt(tx);
845 static ieee80211_tx_result debug_noinline
846 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
848 struct sk_buff *skb = tx->skb;
849 struct ieee80211_hdr *hdr;
854 hdr = (void *) skb->data;
855 next_len = skb->next ? skb->next->len : 0;
856 group_addr = is_multicast_ether_addr(hdr->addr1);
859 ieee80211_duration(tx, group_addr, next_len);
860 } while ((skb = skb->next));
865 static ieee80211_tx_result debug_noinline
866 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
868 struct sk_buff *skb = tx->skb;
873 tx->sta->tx_packets++;
875 tx->sta->tx_fragments++;
876 tx->sta->tx_bytes += skb->len;
877 } while ((skb = skb->next));
882 /* actual transmit path */
885 * deal with packet injection down monitor interface
886 * with Radiotap Header -- only called for monitor mode interface
888 static ieee80211_tx_result
889 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
893 * this is the moment to interpret and discard the radiotap header that
894 * must be at the start of the packet injected in Monitor mode
896 * Need to take some care with endian-ness since radiotap
897 * args are little-endian
900 struct ieee80211_radiotap_iterator iterator;
901 struct ieee80211_radiotap_header *rthdr =
902 (struct ieee80211_radiotap_header *) skb->data;
903 struct ieee80211_supported_band *sband;
904 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
906 sband = tx->local->hw.wiphy->bands[tx->channel->band];
908 skb->do_not_encrypt = 1;
909 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
912 * for every radiotap entry that is present
913 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
914 * entries present, or -EINVAL on error)
918 ret = ieee80211_radiotap_iterator_next(&iterator);
923 /* see if this argument is something we can use */
924 switch (iterator.this_arg_index) {
926 * You must take care when dereferencing iterator.this_arg
927 * for multibyte types... the pointer is not aligned. Use
928 * get_unaligned((type *)iterator.this_arg) to dereference
929 * iterator.this_arg for type "type" safely on all arches.
931 case IEEE80211_RADIOTAP_FLAGS:
932 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
934 * this indicates that the skb we have been
935 * handed has the 32-bit FCS CRC at the end...
936 * we should react to that by snipping it off
937 * because it will be recomputed and added
940 if (skb->len < (iterator.max_length + FCS_LEN))
943 skb_trim(skb, skb->len - FCS_LEN);
945 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
946 tx->skb->do_not_encrypt = 0;
947 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
948 tx->flags |= IEEE80211_TX_FRAGMENTED;
952 * Please update the file
953 * Documentation/networking/mac80211-injection.txt
954 * when parsing new fields here.
962 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
966 * remove the radiotap header
967 * iterator->max_length was sanity-checked against
968 * skb->len by iterator init
970 skb_pull(skb, iterator.max_length);
978 static ieee80211_tx_result
979 __ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
981 struct net_device *dev)
983 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
984 struct ieee80211_hdr *hdr;
985 struct ieee80211_sub_if_data *sdata;
986 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
991 memset(tx, 0, sizeof(*tx));
993 tx->dev = dev; /* use original interface */
995 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
996 tx->channel = local->hw.conf.channel;
998 * Set this flag (used below to indicate "automatic fragmentation"),
999 * it will be cleared/left by radiotap as desired.
1001 tx->flags |= IEEE80211_TX_FRAGMENTED;
1003 /* process and remove the injection radiotap header */
1004 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1005 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
1006 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
1010 * __ieee80211_parse_tx_radiotap has now removed
1011 * the radiotap header that was present and pre-filled
1012 * 'tx' with tx control information.
1016 hdr = (struct ieee80211_hdr *) skb->data;
1018 tx->sta = sta_info_get(local, hdr->addr1);
1020 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1021 unsigned long flags;
1022 qc = ieee80211_get_qos_ctl(hdr);
1023 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1025 spin_lock_irqsave(&tx->sta->lock, flags);
1026 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1027 if (*state == HT_AGG_STATE_OPERATIONAL)
1028 info->flags |= IEEE80211_TX_CTL_AMPDU;
1029 spin_unlock_irqrestore(&tx->sta->lock, flags);
1032 if (is_multicast_ether_addr(hdr->addr1)) {
1033 tx->flags &= ~IEEE80211_TX_UNICAST;
1034 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1036 tx->flags |= IEEE80211_TX_UNICAST;
1037 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1040 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1041 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1042 skb->len + FCS_LEN > local->fragmentation_threshold &&
1043 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1044 tx->flags |= IEEE80211_TX_FRAGMENTED;
1046 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1050 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1051 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1052 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1054 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1055 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1056 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1057 tx->ethertype = (pos[0] << 8) | pos[1];
1059 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1065 * NB: @tx is uninitialised when passed in here
1067 static int ieee80211_tx_prepare(struct ieee80211_local *local,
1068 struct ieee80211_tx_data *tx,
1069 struct sk_buff *skb)
1071 struct net_device *dev;
1073 dev = dev_get_by_index(&init_net, skb->iif);
1074 if (unlikely(dev && !is_ieee80211_device(local, dev))) {
1080 /* initialises tx with control */
1081 __ieee80211_tx_prepare(tx, skb, dev);
1086 static int __ieee80211_tx(struct ieee80211_local *local,
1087 struct ieee80211_tx_data *tx)
1089 struct sk_buff *skb = tx->skb, *next;
1090 struct ieee80211_tx_info *info;
1094 local->mdev->trans_start = jiffies;
1097 if (ieee80211_queue_stopped(&local->hw,
1098 skb_get_queue_mapping(skb)))
1099 return IEEE80211_TX_PENDING;
1101 info = IEEE80211_SKB_CB(skb);
1104 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1105 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1108 * Internally, we need to have the queue mapping point to
1109 * the real AC queue, not the virtual A-MPDU queue. This
1110 * now finally sets the queue to what the driver wants.
1111 * We will later move this down into the only driver that
1112 * needs it, iwlwifi.
1114 if (tx->sta && local->hw.ampdu_queues &&
1115 info->flags & IEEE80211_TX_CTL_AMPDU) {
1116 unsigned long flags;
1117 u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
1118 int tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1120 spin_lock_irqsave(&tx->sta->lock, flags);
1121 skb_set_queue_mapping(skb, local->hw.queues +
1122 tx->sta->tid_to_tx_q[tid]);
1123 spin_unlock_irqrestore(&tx->sta->lock, flags);
1127 ret = local->ops->tx(local_to_hw(local), skb);
1128 if (ret != NETDEV_TX_OK)
1129 return IEEE80211_TX_AGAIN;
1130 tx->skb = skb = next;
1131 ieee80211_led_tx(local, 1);
1135 return IEEE80211_TX_OK;
1139 * Invoke TX handlers, return 0 on success and non-zero if the
1140 * frame was dropped or queued.
1142 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1144 struct sk_buff *skb = tx->skb;
1145 ieee80211_tx_result res = TX_DROP;
1147 #define CALL_TXH(txh) \
1149 if (res != TX_CONTINUE) \
1152 CALL_TXH(ieee80211_tx_h_check_assoc)
1153 CALL_TXH(ieee80211_tx_h_ps_buf)
1154 CALL_TXH(ieee80211_tx_h_select_key)
1155 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1156 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1157 CALL_TXH(ieee80211_tx_h_misc)
1158 CALL_TXH(ieee80211_tx_h_sequence)
1159 CALL_TXH(ieee80211_tx_h_fragment)
1160 /* handlers after fragment must be aware of tx info fragmentation! */
1161 CALL_TXH(ieee80211_tx_h_encrypt)
1162 CALL_TXH(ieee80211_tx_h_calculate_duration)
1163 CALL_TXH(ieee80211_tx_h_stats)
1167 if (unlikely(res == TX_DROP)) {
1168 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1170 struct sk_buff *next;
1177 } else if (unlikely(res == TX_QUEUED)) {
1178 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1185 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
1187 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1188 struct sta_info *sta;
1189 struct ieee80211_tx_data tx;
1190 ieee80211_tx_result res_prepare;
1191 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1195 queue = skb_get_queue_mapping(skb);
1197 WARN_ON(test_bit(queue, local->queues_pending));
1199 if (unlikely(skb->len < 10)) {
1206 /* initialises tx */
1207 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
1209 if (res_prepare == TX_DROP) {
1216 tx.channel = local->hw.conf.channel;
1217 info->band = tx.channel->band;
1219 if (invoke_tx_handlers(&tx))
1223 ret = __ieee80211_tx(local, &tx);
1225 struct ieee80211_tx_stored_packet *store;
1228 * Since there are no fragmented frames on A-MPDU
1229 * queues, there's no reason for a driver to reject
1230 * a frame there, warn and drop it.
1232 if (ret != IEEE80211_TX_PENDING)
1233 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1236 store = &local->pending_packet[queue];
1238 set_bit(queue, local->queues_pending);
1241 * When the driver gets out of buffers during sending of
1242 * fragments and calls ieee80211_stop_queue, the netif
1243 * subqueue is stopped. There is, however, a small window
1244 * in which the PENDING bit is not yet set. If a buffer
1245 * gets available in that window (i.e. driver calls
1246 * ieee80211_wake_queue), we would end up with ieee80211_tx
1247 * called with the PENDING bit still set. Prevent this by
1248 * continuing transmitting here when that situation is
1249 * possible to have happened.
1251 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1252 clear_bit(queue, local->queues_pending);
1255 store->skb = tx.skb;
1266 struct sk_buff *next;
1275 /* device xmit handlers */
1277 static int ieee80211_skb_resize(struct ieee80211_local *local,
1278 struct sk_buff *skb,
1279 int head_need, bool may_encrypt)
1284 * This could be optimised, devices that do full hardware
1285 * crypto (including TKIP MMIC) need no tailroom... But we
1286 * have no drivers for such devices currently.
1289 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1290 tail_need -= skb_tailroom(skb);
1291 tail_need = max_t(int, tail_need, 0);
1294 if (head_need || tail_need) {
1295 /* Sorry. Can't account for this any more */
1299 if (skb_header_cloned(skb))
1300 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1302 I802_DEBUG_INC(local->tx_expand_skb_head);
1304 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1305 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1306 wiphy_name(local->hw.wiphy));
1310 /* update truesize too */
1311 skb->truesize += head_need + tail_need;
1316 int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
1318 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
1319 struct ieee80211_local *local = mpriv->local;
1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1321 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1322 struct net_device *odev = NULL;
1323 struct ieee80211_sub_if_data *osdata;
1330 } monitor_iface = NOT_MONITOR;
1334 odev = dev_get_by_index(&init_net, skb->iif);
1335 if (unlikely(odev && !is_ieee80211_device(local, odev))) {
1339 if (unlikely(!odev)) {
1340 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1341 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1342 "originating device\n", dev->name);
1348 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1349 local->hw.conf.dynamic_ps_timeout > 0) {
1350 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1351 ieee80211_stop_queues_by_reason(&local->hw,
1352 IEEE80211_QUEUE_STOP_REASON_PS);
1353 queue_work(local->hw.workqueue,
1354 &local->dynamic_ps_disable_work);
1357 mod_timer(&local->dynamic_ps_timer, jiffies +
1358 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1361 memset(info, 0, sizeof(*info));
1363 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1365 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1367 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1368 ieee80211_is_data(hdr->frame_control)) {
1369 if (is_multicast_ether_addr(hdr->addr3))
1370 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1372 if (mesh_nexthop_lookup(skb, osdata)) {
1376 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1377 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1379 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1380 struct ieee80211_sub_if_data *sdata;
1384 info->flags |= IEEE80211_TX_CTL_INJECTED;
1385 monitor_iface = UNKNOWN_ADDRESS;
1387 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1388 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1389 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1391 /* check the header is complete in the frame */
1392 if (likely(skb->len >= len_rthdr + hdrlen)) {
1394 * We process outgoing injected frames that have a
1395 * local address we handle as though they are our
1397 * This code here isn't entirely correct, the local
1398 * MAC address is not necessarily enough to find
1399 * the interface to use; for that proper VLAN/WDS
1400 * support we will need a different mechanism.
1404 list_for_each_entry_rcu(sdata, &local->interfaces,
1406 if (!netif_running(sdata->dev))
1408 if (sdata->vif.type != NL80211_IFTYPE_AP)
1410 if (compare_ether_addr(sdata->dev->dev_addr,
1412 dev_hold(sdata->dev);
1416 skb->iif = sdata->dev->ifindex;
1417 monitor_iface = FOUND_SDATA;
1425 may_encrypt = !skb->do_not_encrypt;
1427 headroom = osdata->local->tx_headroom;
1429 headroom += IEEE80211_ENCRYPT_HEADROOM;
1430 headroom -= skb_headroom(skb);
1431 headroom = max_t(int, 0, headroom);
1433 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1439 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1440 osdata = container_of(osdata->bss,
1441 struct ieee80211_sub_if_data,
1443 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1444 info->control.vif = &osdata->vif;
1445 ret = ieee80211_tx(odev, skb);
1451 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1452 struct net_device *dev)
1454 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1455 struct ieee80211_channel *chan = local->hw.conf.channel;
1456 struct ieee80211_radiotap_header *prthdr =
1457 (struct ieee80211_radiotap_header *)skb->data;
1461 * Frame injection is not allowed if beaconing is not allowed
1462 * or if we need radar detection. Beaconing is usually not allowed when
1463 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1464 * Passive scan is also used in world regulatory domains where
1465 * your country is not known and as such it should be treated as
1466 * NO TX unless the channel is explicitly allowed in which case
1467 * your current regulatory domain would not have the passive scan
1470 * Since AP mode uses monitor interfaces to inject/TX management
1471 * frames we can make AP mode the exception to this rule once it
1472 * supports radar detection as its implementation can deal with
1473 * radar detection by itself. We can do that later by adding a
1474 * monitor flag interfaces used for AP support.
1476 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1477 IEEE80211_CHAN_PASSIVE_SCAN)))
1480 /* check for not even having the fixed radiotap header part */
1481 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1482 goto fail; /* too short to be possibly valid */
1484 /* is it a header version we can trust to find length from? */
1485 if (unlikely(prthdr->it_version))
1486 goto fail; /* only version 0 is supported */
1488 /* then there must be a radiotap header with a length we can use */
1489 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1491 /* does the skb contain enough to deliver on the alleged length? */
1492 if (unlikely(skb->len < len_rthdr))
1493 goto fail; /* skb too short for claimed rt header extent */
1495 skb->dev = local->mdev;
1497 /* needed because we set skb device to master */
1498 skb->iif = dev->ifindex;
1500 /* sometimes we do encrypt injected frames, will be fixed
1501 * up in radiotap parser if not wanted */
1502 skb->do_not_encrypt = 0;
1505 * fix up the pointers accounting for the radiotap
1506 * header still being in there. We are being given
1507 * a precooked IEEE80211 header so no need for
1510 skb_set_mac_header(skb, len_rthdr);
1512 * these are just fixed to the end of the rt area since we
1513 * don't have any better information and at this point, nobody cares
1515 skb_set_network_header(skb, len_rthdr);
1516 skb_set_transport_header(skb, len_rthdr);
1518 /* pass the radiotap header up to the next stage intact */
1519 dev_queue_xmit(skb);
1520 return NETDEV_TX_OK;
1524 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1528 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1529 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1530 * @skb: packet to be sent
1531 * @dev: incoming interface
1533 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1534 * not be freed, and caller is responsible for either retrying later or freeing
1537 * This function takes in an Ethernet header and encapsulates it with suitable
1538 * IEEE 802.11 header based on which interface the packet is coming in. The
1539 * encapsulated packet will then be passed to master interface, wlan#.11, for
1540 * transmission (through low-level driver).
1542 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1543 struct net_device *dev)
1545 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1546 struct ieee80211_local *local = sdata->local;
1547 int ret = 1, head_need;
1548 u16 ethertype, hdrlen, meshhdrlen = 0;
1550 struct ieee80211_hdr hdr;
1551 struct ieee80211s_hdr mesh_hdr;
1552 const u8 *encaps_data;
1553 int encaps_len, skip_header_bytes;
1555 struct sta_info *sta;
1558 if (unlikely(skb->len < ETH_HLEN)) {
1563 nh_pos = skb_network_header(skb) - skb->data;
1564 h_pos = skb_transport_header(skb) - skb->data;
1566 /* convert Ethernet header to proper 802.11 header (based on
1567 * operation mode) */
1568 ethertype = (skb->data[12] << 8) | skb->data[13];
1569 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1571 switch (sdata->vif.type) {
1572 case NL80211_IFTYPE_AP:
1573 case NL80211_IFTYPE_AP_VLAN:
1574 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1576 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1577 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1578 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1581 case NL80211_IFTYPE_WDS:
1582 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1584 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1585 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1586 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1587 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1590 #ifdef CONFIG_MAC80211_MESH
1591 case NL80211_IFTYPE_MESH_POINT:
1592 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1593 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1594 /* Do not send frames with mesh_ttl == 0 */
1595 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1599 memset(&mesh_hdr, 0, sizeof(mesh_hdr));
1601 if (compare_ether_addr(dev->dev_addr,
1602 skb->data + ETH_ALEN) == 0) {
1604 memset(hdr.addr1, 0, ETH_ALEN);
1605 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1606 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1607 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1608 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1610 /* packet from other interface */
1611 struct mesh_path *mppath;
1613 memset(hdr.addr1, 0, ETH_ALEN);
1614 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1615 memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN);
1617 if (is_multicast_ether_addr(skb->data))
1618 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1621 mppath = mpp_path_lookup(skb->data, sdata);
1623 memcpy(hdr.addr3, mppath->mpp, ETH_ALEN);
1625 memset(hdr.addr3, 0xff, ETH_ALEN);
1629 mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6;
1630 mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
1631 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum);
1632 memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN);
1633 memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN);
1634 sdata->u.mesh.mesh_seqnum++;
1640 case NL80211_IFTYPE_STATION:
1641 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1643 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1644 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1645 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1648 case NL80211_IFTYPE_ADHOC:
1650 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1651 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1652 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1661 * There's no need to try to look up the destination
1662 * if it is a multicast address (which can only happen
1665 if (!is_multicast_ether_addr(hdr.addr1)) {
1667 sta = sta_info_get(local, hdr.addr1);
1669 sta_flags = get_sta_flags(sta);
1673 /* receiver and we are QoS enabled, use a QoS type frame */
1674 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1675 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1680 * Drop unicast frames to unauthorised stations unless they are
1681 * EAPOL frames from the local station.
1683 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1684 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1685 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1686 !(ethertype == ETH_P_PAE &&
1687 compare_ether_addr(dev->dev_addr,
1688 skb->data + ETH_ALEN) == 0))) {
1689 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1690 if (net_ratelimit())
1691 printk(KERN_DEBUG "%s: dropped frame to %pM"
1692 " (unauthorized port)\n", dev->name,
1696 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1702 hdr.frame_control = fc;
1703 hdr.duration_id = 0;
1706 skip_header_bytes = ETH_HLEN;
1707 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1708 encaps_data = bridge_tunnel_header;
1709 encaps_len = sizeof(bridge_tunnel_header);
1710 skip_header_bytes -= 2;
1711 } else if (ethertype >= 0x600) {
1712 encaps_data = rfc1042_header;
1713 encaps_len = sizeof(rfc1042_header);
1714 skip_header_bytes -= 2;
1720 skb_pull(skb, skip_header_bytes);
1721 nh_pos -= skip_header_bytes;
1722 h_pos -= skip_header_bytes;
1724 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1727 * So we need to modify the skb header and hence need a copy of
1728 * that. The head_need variable above doesn't, so far, include
1729 * the needed header space that we don't need right away. If we
1730 * can, then we don't reallocate right now but only after the
1731 * frame arrives at the master device (if it does...)
1733 * If we cannot, however, then we will reallocate to include all
1734 * the ever needed space. Also, if we need to reallocate it anyway,
1735 * make it big enough for everything we may ever need.
1738 if (head_need > 0 || skb_cloned(skb)) {
1739 head_need += IEEE80211_ENCRYPT_HEADROOM;
1740 head_need += local->tx_headroom;
1741 head_need = max_t(int, 0, head_need);
1742 if (ieee80211_skb_resize(local, skb, head_need, true))
1747 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1748 nh_pos += encaps_len;
1749 h_pos += encaps_len;
1752 if (meshhdrlen > 0) {
1753 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1754 nh_pos += meshhdrlen;
1755 h_pos += meshhdrlen;
1758 if (ieee80211_is_data_qos(fc)) {
1759 __le16 *qos_control;
1761 qos_control = (__le16*) skb_push(skb, 2);
1762 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1764 * Maybe we could actually set some fields here, for now just
1765 * initialise to zero to indicate no special operation.
1769 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1774 skb->iif = dev->ifindex;
1776 skb->dev = local->mdev;
1777 dev->stats.tx_packets++;
1778 dev->stats.tx_bytes += skb->len;
1780 /* Update skb pointers to various headers since this modified frame
1781 * is going to go through Linux networking code that may potentially
1782 * need things like pointer to IP header. */
1783 skb_set_mac_header(skb, 0);
1784 skb_set_network_header(skb, nh_pos);
1785 skb_set_transport_header(skb, h_pos);
1787 dev->trans_start = jiffies;
1788 dev_queue_xmit(skb);
1801 * ieee80211_clear_tx_pending may not be called in a context where
1802 * it is possible that it packets could come in again.
1804 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1806 struct sk_buff *skb;
1809 for (i = 0; i < local->hw.queues; i++) {
1810 if (!test_bit(i, local->queues_pending))
1813 skb = local->pending_packet[i].skb;
1815 struct sk_buff *next;
1821 clear_bit(i, local->queues_pending);
1826 * Transmit all pending packets. Called from tasklet, locks master device
1827 * TX lock so that no new packets can come in.
1829 void ieee80211_tx_pending(unsigned long data)
1831 struct ieee80211_local *local = (struct ieee80211_local *)data;
1832 struct net_device *dev = local->mdev;
1833 struct ieee80211_tx_stored_packet *store;
1834 struct ieee80211_hdr *hdr;
1835 struct ieee80211_tx_data tx;
1839 netif_tx_lock_bh(dev);
1840 for (i = 0; i < local->hw.queues; i++) {
1841 /* Check that this queue is ok */
1842 if (__netif_subqueue_stopped(local->mdev, i) &&
1843 !test_bit(i, local->queues_pending_run))
1846 if (!test_bit(i, local->queues_pending)) {
1847 clear_bit(i, local->queues_pending_run);
1848 ieee80211_wake_queue(&local->hw, i);
1852 clear_bit(i, local->queues_pending_run);
1853 netif_start_subqueue(local->mdev, i);
1855 store = &local->pending_packet[i];
1857 tx.skb = store->skb;
1858 hdr = (struct ieee80211_hdr *)tx.skb->data;
1859 tx.sta = sta_info_get(local, hdr->addr1);
1860 ret = __ieee80211_tx(local, &tx);
1861 store->skb = tx.skb;
1863 clear_bit(i, local->queues_pending);
1864 ieee80211_wake_queue(&local->hw, i);
1867 netif_tx_unlock_bh(dev);
1871 /* functions for drivers to get certain frames */
1873 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
1874 struct sk_buff *skb,
1875 struct beacon_data *beacon)
1879 int i, have_bits = 0, n1, n2;
1881 /* Generate bitmap for TIM only if there are any STAs in power save
1883 if (atomic_read(&bss->num_sta_ps) > 0)
1884 /* in the hope that this is faster than
1885 * checking byte-for-byte */
1886 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1887 IEEE80211_MAX_AID+1);
1889 if (bss->dtim_count == 0)
1890 bss->dtim_count = beacon->dtim_period - 1;
1894 tim = pos = (u8 *) skb_put(skb, 6);
1895 *pos++ = WLAN_EID_TIM;
1897 *pos++ = bss->dtim_count;
1898 *pos++ = beacon->dtim_period;
1900 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1904 /* Find largest even number N1 so that bits numbered 1 through
1905 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1906 * (N2 + 1) x 8 through 2007 are 0. */
1908 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1915 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1922 /* Bitmap control */
1924 /* Part Virt Bitmap */
1925 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1927 tim[1] = n2 - n1 + 4;
1928 skb_put(skb, n2 - n1);
1930 *pos++ = aid0; /* Bitmap control */
1931 *pos++ = 0; /* Part Virt Bitmap */
1935 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1936 struct ieee80211_vif *vif)
1938 struct ieee80211_local *local = hw_to_local(hw);
1939 struct sk_buff *skb = NULL;
1940 struct ieee80211_tx_info *info;
1941 struct ieee80211_sub_if_data *sdata = NULL;
1942 struct ieee80211_if_ap *ap = NULL;
1943 struct beacon_data *beacon;
1944 struct ieee80211_supported_band *sband;
1945 enum ieee80211_band band = local->hw.conf.channel->band;
1947 sband = local->hw.wiphy->bands[band];
1951 sdata = vif_to_sdata(vif);
1953 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1955 beacon = rcu_dereference(ap->beacon);
1958 * headroom, head length,
1959 * tail length and maximum TIM length
1961 skb = dev_alloc_skb(local->tx_headroom +
1963 beacon->tail_len + 256);
1967 skb_reserve(skb, local->tx_headroom);
1968 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1972 * Not very nice, but we want to allow the driver to call
1973 * ieee80211_beacon_get() as a response to the set_tim()
1974 * callback. That, however, is already invoked under the
1975 * sta_lock to guarantee consistent and race-free update
1976 * of the tim bitmap in mac80211 and the driver.
1978 if (local->tim_in_locked_section) {
1979 ieee80211_beacon_add_tim(ap, skb, beacon);
1981 unsigned long flags;
1983 spin_lock_irqsave(&local->sta_lock, flags);
1984 ieee80211_beacon_add_tim(ap, skb, beacon);
1985 spin_unlock_irqrestore(&local->sta_lock, flags);
1989 memcpy(skb_put(skb, beacon->tail_len),
1990 beacon->tail, beacon->tail_len);
1993 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1994 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1995 struct ieee80211_hdr *hdr;
1997 if (!ifibss->probe_resp)
2000 skb = skb_copy(ifibss->probe_resp, GFP_ATOMIC);
2004 hdr = (struct ieee80211_hdr *) skb->data;
2005 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2006 IEEE80211_STYPE_BEACON);
2008 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2009 struct ieee80211_mgmt *mgmt;
2012 /* headroom, head length, tail length and maximum TIM length */
2013 skb = dev_alloc_skb(local->tx_headroom + 400);
2017 skb_reserve(skb, local->hw.extra_tx_headroom);
2018 mgmt = (struct ieee80211_mgmt *)
2019 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2020 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2021 mgmt->frame_control =
2022 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2023 memset(mgmt->da, 0xff, ETH_ALEN);
2024 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2025 /* BSSID is left zeroed, wildcard value */
2026 mgmt->u.beacon.beacon_int =
2027 cpu_to_le16(local->hw.conf.beacon_int);
2028 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2030 pos = skb_put(skb, 2);
2031 *pos++ = WLAN_EID_SSID;
2034 mesh_mgmt_ies_add(skb, sdata);
2040 info = IEEE80211_SKB_CB(skb);
2042 skb->do_not_encrypt = 1;
2046 * XXX: For now, always use the lowest rate
2048 info->control.rates[0].idx = 0;
2049 info->control.rates[0].count = 1;
2050 info->control.rates[1].idx = -1;
2051 info->control.rates[2].idx = -1;
2052 info->control.rates[3].idx = -1;
2053 info->control.rates[4].idx = -1;
2054 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
2056 info->control.vif = vif;
2058 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2059 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
2060 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2065 EXPORT_SYMBOL(ieee80211_beacon_get);
2067 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2068 const void *frame, size_t frame_len,
2069 const struct ieee80211_tx_info *frame_txctl,
2070 struct ieee80211_rts *rts)
2072 const struct ieee80211_hdr *hdr = frame;
2074 rts->frame_control =
2075 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2076 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2078 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2079 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2081 EXPORT_SYMBOL(ieee80211_rts_get);
2083 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2084 const void *frame, size_t frame_len,
2085 const struct ieee80211_tx_info *frame_txctl,
2086 struct ieee80211_cts *cts)
2088 const struct ieee80211_hdr *hdr = frame;
2090 cts->frame_control =
2091 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2092 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2093 frame_len, frame_txctl);
2094 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2096 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2099 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2100 struct ieee80211_vif *vif)
2102 struct ieee80211_local *local = hw_to_local(hw);
2103 struct sk_buff *skb = NULL;
2104 struct sta_info *sta;
2105 struct ieee80211_tx_data tx;
2106 struct ieee80211_sub_if_data *sdata;
2107 struct ieee80211_if_ap *bss = NULL;
2108 struct beacon_data *beacon;
2109 struct ieee80211_tx_info *info;
2111 sdata = vif_to_sdata(vif);
2118 beacon = rcu_dereference(bss->beacon);
2120 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2123 if (bss->dtim_count != 0)
2124 goto out; /* send buffered bc/mc only after DTIM beacon */
2127 skb = skb_dequeue(&bss->ps_bc_buf);
2130 local->total_ps_buffered--;
2132 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2133 struct ieee80211_hdr *hdr =
2134 (struct ieee80211_hdr *) skb->data;
2135 /* more buffered multicast/broadcast frames ==> set
2136 * MoreData flag in IEEE 802.11 header to inform PS
2138 hdr->frame_control |=
2139 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2142 if (!ieee80211_tx_prepare(local, &tx, skb))
2144 dev_kfree_skb_any(skb);
2147 info = IEEE80211_SKB_CB(skb);
2150 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2151 tx.channel = local->hw.conf.channel;
2152 info->band = tx.channel->band;
2154 if (invoke_tx_handlers(&tx))
2161 EXPORT_SYMBOL(ieee80211_get_buffered_bc);