Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / tx.c
blob3104c844b544c5465ef5ba1e7efcff05ca920501
1 /*
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"
29 #include "led.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "wpa.h"
33 #include "wme.h"
34 #include "rate.h"
36 /* misc utils */
38 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
39 int next_frag_len)
41 int rate, mrate, erp, dur, i;
42 struct ieee80211_rate *txrate;
43 struct ieee80211_local *local = tx->local;
44 struct ieee80211_supported_band *sband;
45 struct ieee80211_hdr *hdr;
46 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
48 /* assume HW handles this */
49 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
50 return 0;
52 /* uh huh? */
53 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
54 return 0;
56 sband = local->hw.wiphy->bands[tx->channel->band];
57 txrate = &sband->bitrates[info->control.rates[0].idx];
59 erp = txrate->flags & IEEE80211_RATE_ERP_G;
62 * data and mgmt (except PS Poll):
63 * - during CFP: 32768
64 * - during contention period:
65 * if addr1 is group address: 0
66 * if more fragments = 0 and addr1 is individual address: time to
67 * transmit one ACK plus SIFS
68 * if more fragments = 1 and addr1 is individual address: time to
69 * transmit next fragment plus 2 x ACK plus 3 x SIFS
71 * IEEE 802.11, 9.6:
72 * - control response frame (CTS or ACK) shall be transmitted using the
73 * same rate as the immediately previous frame in the frame exchange
74 * sequence, if this rate belongs to the PHY mandatory rates, or else
75 * at the highest possible rate belonging to the PHY rates in the
76 * BSSBasicRateSet
78 hdr = (struct ieee80211_hdr *)tx->skb->data;
79 if (ieee80211_is_ctl(hdr->frame_control)) {
80 /* TODO: These control frames are not currently sent by
81 * mac80211, but should they be implemented, this function
82 * needs to be updated to support duration field calculation.
84 * RTS: time needed to transmit pending data/mgmt frame plus
85 * one CTS frame plus one ACK frame plus 3 x SIFS
86 * CTS: duration of immediately previous RTS minus time
87 * required to transmit CTS and its SIFS
88 * ACK: 0 if immediately previous directed data/mgmt had
89 * more=0, with more=1 duration in ACK frame is duration
90 * from previous frame minus time needed to transmit ACK
91 * and its SIFS
92 * PS Poll: BIT(15) | BIT(14) | aid
94 return 0;
97 /* data/mgmt */
98 if (0 /* FIX: data/mgmt during CFP */)
99 return cpu_to_le16(32768);
101 if (group_addr) /* Group address as the destination - no ACK */
102 return 0;
104 /* Individual destination address:
105 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
106 * CTS and ACK frames shall be transmitted using the highest rate in
107 * basic rate set that is less than or equal to the rate of the
108 * immediately previous frame and that is using the same modulation
109 * (CCK or OFDM). If no basic rate set matches with these requirements,
110 * the highest mandatory rate of the PHY that is less than or equal to
111 * the rate of the previous frame is used.
112 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
114 rate = -1;
115 /* use lowest available if everything fails */
116 mrate = sband->bitrates[0].bitrate;
117 for (i = 0; i < sband->n_bitrates; i++) {
118 struct ieee80211_rate *r = &sband->bitrates[i];
120 if (r->bitrate > txrate->bitrate)
121 break;
123 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
124 rate = r->bitrate;
126 switch (sband->band) {
127 case IEEE80211_BAND_2GHZ: {
128 u32 flag;
129 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
130 flag = IEEE80211_RATE_MANDATORY_G;
131 else
132 flag = IEEE80211_RATE_MANDATORY_B;
133 if (r->flags & flag)
134 mrate = r->bitrate;
135 break;
137 case IEEE80211_BAND_5GHZ:
138 if (r->flags & IEEE80211_RATE_MANDATORY_A)
139 mrate = r->bitrate;
140 break;
141 case IEEE80211_NUM_BANDS:
142 WARN_ON(1);
143 break;
146 if (rate == -1) {
147 /* No matching basic rate found; use highest suitable mandatory
148 * PHY rate */
149 rate = mrate;
152 /* Time needed to transmit ACK
153 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
154 * to closest integer */
156 dur = ieee80211_frame_duration(local, 10, rate, erp,
157 tx->sdata->vif.bss_conf.use_short_preamble);
159 if (next_frag_len) {
160 /* Frame is fragmented: duration increases with time needed to
161 * transmit next fragment plus ACK and 2 x SIFS. */
162 dur *= 2; /* ACK + SIFS */
163 /* next fragment */
164 dur += ieee80211_frame_duration(local, next_frag_len,
165 txrate->bitrate, erp,
166 tx->sdata->vif.bss_conf.use_short_preamble);
169 return cpu_to_le16(dur);
172 static inline int is_ieee80211_device(struct ieee80211_local *local,
173 struct net_device *dev)
175 return local == wdev_priv(dev->ieee80211_ptr);
178 /* tx handlers */
179 static ieee80211_tx_result debug_noinline
180 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
182 struct ieee80211_local *local = tx->local;
183 struct ieee80211_if_managed *ifmgd;
185 /* driver doesn't support power save */
186 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
187 return TX_CONTINUE;
189 /* hardware does dynamic power save */
190 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
191 return TX_CONTINUE;
193 /* dynamic power save disabled */
194 if (local->hw.conf.dynamic_ps_timeout <= 0)
195 return TX_CONTINUE;
197 /* we are scanning, don't enable power save */
198 if (local->scanning)
199 return TX_CONTINUE;
201 if (!local->ps_sdata)
202 return TX_CONTINUE;
204 /* No point if we're going to suspend */
205 if (local->quiescing)
206 return TX_CONTINUE;
208 /* dynamic ps is supported only in managed mode */
209 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
210 return TX_CONTINUE;
212 ifmgd = &tx->sdata->u.mgd;
215 * Don't wakeup from power save if u-apsd is enabled, voip ac has
216 * u-apsd enabled and the frame is in voip class. This effectively
217 * means that even if all access categories have u-apsd enabled, in
218 * practise u-apsd is only used with the voip ac. This is a
219 * workaround for the case when received voip class packets do not
220 * have correct qos tag for some reason, due the network or the
221 * peer application.
223 * Note: local->uapsd_queues access is racy here. If the value is
224 * changed via debugfs, user needs to reassociate manually to have
225 * everything in sync.
227 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
228 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
229 && skb_get_queue_mapping(tx->skb) == 0)
230 return TX_CONTINUE;
232 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
233 ieee80211_stop_queues_by_reason(&local->hw,
234 IEEE80211_QUEUE_STOP_REASON_PS);
235 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
236 ieee80211_queue_work(&local->hw,
237 &local->dynamic_ps_disable_work);
240 /* Don't restart the timer if we're not disassociated */
241 if (!ifmgd->associated)
242 return TX_CONTINUE;
244 mod_timer(&local->dynamic_ps_timer, jiffies +
245 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
247 return TX_CONTINUE;
250 static ieee80211_tx_result debug_noinline
251 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
254 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
255 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
256 u32 sta_flags;
258 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
259 return TX_CONTINUE;
261 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
262 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
263 !ieee80211_is_probe_req(hdr->frame_control) &&
264 !ieee80211_is_nullfunc(hdr->frame_control))
266 * When software scanning only nullfunc frames (to notify
267 * the sleep state to the AP) and probe requests (for the
268 * active scan) are allowed, all other frames should not be
269 * sent and we should not get here, but if we do
270 * nonetheless, drop them to avoid sending them
271 * off-channel. See the link below and
272 * ieee80211_start_scan() for more.
274 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
276 return TX_DROP;
278 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
279 return TX_CONTINUE;
281 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
282 return TX_CONTINUE;
284 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
285 return TX_CONTINUE;
287 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
289 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
290 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
291 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
292 ieee80211_is_data(hdr->frame_control))) {
293 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
294 printk(KERN_DEBUG "%s: dropped data frame to not "
295 "associated station %pM\n",
296 tx->sdata->name, hdr->addr1);
297 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
298 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
299 return TX_DROP;
301 } else {
302 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
303 tx->local->num_sta == 0 &&
304 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
306 * No associated STAs - no need to send multicast
307 * frames.
309 return TX_DROP;
311 return TX_CONTINUE;
314 return TX_CONTINUE;
317 /* This function is called whenever the AP is about to exceed the maximum limit
318 * of buffered frames for power saving STAs. This situation should not really
319 * happen often during normal operation, so dropping the oldest buffered packet
320 * from each queue should be OK to make some room for new frames. */
321 static void purge_old_ps_buffers(struct ieee80211_local *local)
323 int total = 0, purged = 0;
324 struct sk_buff *skb;
325 struct ieee80211_sub_if_data *sdata;
326 struct sta_info *sta;
329 * virtual interfaces are protected by RCU
331 rcu_read_lock();
333 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
334 struct ieee80211_if_ap *ap;
335 if (sdata->vif.type != NL80211_IFTYPE_AP)
336 continue;
337 ap = &sdata->u.ap;
338 skb = skb_dequeue(&ap->ps_bc_buf);
339 if (skb) {
340 purged++;
341 dev_kfree_skb(skb);
343 total += skb_queue_len(&ap->ps_bc_buf);
346 list_for_each_entry_rcu(sta, &local->sta_list, list) {
347 skb = skb_dequeue(&sta->ps_tx_buf);
348 if (skb) {
349 purged++;
350 dev_kfree_skb(skb);
352 total += skb_queue_len(&sta->ps_tx_buf);
355 rcu_read_unlock();
357 local->total_ps_buffered = total;
358 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
359 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
360 purged);
361 #endif
364 static ieee80211_tx_result
365 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
367 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
368 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
371 * broadcast/multicast frame
373 * If any of the associated stations is in power save mode,
374 * the frame is buffered to be sent after DTIM beacon frame.
375 * This is done either by the hardware or us.
378 /* powersaving STAs only in AP/VLAN mode */
379 if (!tx->sdata->bss)
380 return TX_CONTINUE;
382 /* no buffering for ordered frames */
383 if (ieee80211_has_order(hdr->frame_control))
384 return TX_CONTINUE;
386 /* no stations in PS mode */
387 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
388 return TX_CONTINUE;
390 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
392 /* device releases frame after DTIM beacon */
393 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
394 return TX_CONTINUE;
396 /* buffered in mac80211 */
397 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
398 purge_old_ps_buffers(tx->local);
400 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
401 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
402 if (net_ratelimit())
403 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
404 tx->sdata->name);
405 #endif
406 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
407 } else
408 tx->local->total_ps_buffered++;
410 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
412 return TX_QUEUED;
415 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
416 struct sk_buff *skb)
418 if (!ieee80211_is_mgmt(fc))
419 return 0;
421 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
422 return 0;
424 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
425 skb->data))
426 return 0;
428 return 1;
431 static ieee80211_tx_result
432 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
434 struct sta_info *sta = tx->sta;
435 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
436 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
437 struct ieee80211_local *local = tx->local;
438 u32 staflags;
440 if (unlikely(!sta ||
441 ieee80211_is_probe_resp(hdr->frame_control) ||
442 ieee80211_is_auth(hdr->frame_control) ||
443 ieee80211_is_assoc_resp(hdr->frame_control) ||
444 ieee80211_is_reassoc_resp(hdr->frame_control)))
445 return TX_CONTINUE;
447 staflags = get_sta_flags(sta);
449 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
450 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
451 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
452 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
453 "before %d)\n",
454 sta->sta.addr, sta->sta.aid,
455 skb_queue_len(&sta->ps_tx_buf));
456 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
457 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
458 purge_old_ps_buffers(tx->local);
459 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
460 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
461 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
462 if (net_ratelimit()) {
463 printk(KERN_DEBUG "%s: STA %pM TX "
464 "buffer full - dropping oldest frame\n",
465 tx->sdata->name, sta->sta.addr);
467 #endif
468 dev_kfree_skb(old);
469 } else
470 tx->local->total_ps_buffered++;
473 * Queue frame to be sent after STA wakes up/polls,
474 * but don't set the TIM bit if the driver is blocking
475 * wakeup or poll response transmissions anyway.
477 if (skb_queue_empty(&sta->ps_tx_buf) &&
478 !(staflags & WLAN_STA_PS_DRIVER))
479 sta_info_set_tim_bit(sta);
481 info->control.jiffies = jiffies;
482 info->control.vif = &tx->sdata->vif;
483 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
484 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
486 if (!timer_pending(&local->sta_cleanup))
487 mod_timer(&local->sta_cleanup,
488 round_jiffies(jiffies +
489 STA_INFO_CLEANUP_INTERVAL));
491 return TX_QUEUED;
493 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
494 else if (unlikely(staflags & WLAN_STA_PS_STA)) {
495 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
496 "set -> send frame\n", tx->sdata->name,
497 sta->sta.addr);
499 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
501 return TX_CONTINUE;
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
507 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
508 return TX_CONTINUE;
510 if (tx->flags & IEEE80211_TX_UNICAST)
511 return ieee80211_tx_h_unicast_ps_buf(tx);
512 else
513 return ieee80211_tx_h_multicast_ps_buf(tx);
516 static ieee80211_tx_result debug_noinline
517 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
521 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
522 tx->sdata->control_port_no_encrypt))
523 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
525 return TX_CONTINUE;
528 static ieee80211_tx_result debug_noinline
529 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
531 struct ieee80211_key *key = NULL;
532 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
533 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
535 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
536 tx->key = NULL;
537 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
538 tx->key = key;
539 else if (ieee80211_is_mgmt(hdr->frame_control) &&
540 is_multicast_ether_addr(hdr->addr1) &&
541 ieee80211_is_robust_mgmt_frame(hdr) &&
542 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
543 tx->key = key;
544 else if (is_multicast_ether_addr(hdr->addr1) &&
545 (key = rcu_dereference(tx->sdata->default_multicast_key)))
546 tx->key = key;
547 else if (!is_multicast_ether_addr(hdr->addr1) &&
548 (key = rcu_dereference(tx->sdata->default_unicast_key)))
549 tx->key = key;
550 else if (tx->sdata->drop_unencrypted &&
551 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
552 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
553 (!ieee80211_is_robust_mgmt_frame(hdr) ||
554 (ieee80211_is_action(hdr->frame_control) &&
555 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
556 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
557 return TX_DROP;
558 } else
559 tx->key = NULL;
561 if (tx->key) {
562 bool skip_hw = false;
564 tx->key->tx_rx_count++;
565 /* TODO: add threshold stuff again */
567 switch (tx->key->conf.cipher) {
568 case WLAN_CIPHER_SUITE_WEP40:
569 case WLAN_CIPHER_SUITE_WEP104:
570 if (ieee80211_is_auth(hdr->frame_control))
571 break;
572 case WLAN_CIPHER_SUITE_TKIP:
573 if (!ieee80211_is_data_present(hdr->frame_control))
574 tx->key = NULL;
575 break;
576 case WLAN_CIPHER_SUITE_CCMP:
577 if (!ieee80211_is_data_present(hdr->frame_control) &&
578 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
579 tx->skb))
580 tx->key = NULL;
581 else
582 skip_hw = (tx->key->conf.flags &
583 IEEE80211_KEY_FLAG_SW_MGMT) &&
584 ieee80211_is_mgmt(hdr->frame_control);
585 break;
586 case WLAN_CIPHER_SUITE_AES_CMAC:
587 if (!ieee80211_is_mgmt(hdr->frame_control))
588 tx->key = NULL;
589 break;
592 if (!skip_hw && tx->key &&
593 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
594 info->control.hw_key = &tx->key->conf;
597 return TX_CONTINUE;
600 static ieee80211_tx_result debug_noinline
601 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
603 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
604 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
605 struct ieee80211_supported_band *sband;
606 struct ieee80211_rate *rate;
607 int i;
608 u32 len;
609 bool inval = false, rts = false, short_preamble = false;
610 struct ieee80211_tx_rate_control txrc;
611 u32 sta_flags;
613 memset(&txrc, 0, sizeof(txrc));
615 sband = tx->local->hw.wiphy->bands[tx->channel->band];
617 len = min_t(u32, tx->skb->len + FCS_LEN,
618 tx->local->hw.wiphy->frag_threshold);
620 /* set up the tx rate control struct we give the RC algo */
621 txrc.hw = local_to_hw(tx->local);
622 txrc.sband = sband;
623 txrc.bss_conf = &tx->sdata->vif.bss_conf;
624 txrc.skb = tx->skb;
625 txrc.reported_rate.idx = -1;
626 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
627 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
628 txrc.max_rate_idx = -1;
629 else
630 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
631 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
632 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
634 /* set up RTS protection if desired */
635 if (len > tx->local->hw.wiphy->rts_threshold) {
636 txrc.rts = rts = true;
640 * Use short preamble if the BSS can handle it, but not for
641 * management frames unless we know the receiver can handle
642 * that -- the management frame might be to a station that
643 * just wants a probe response.
645 if (tx->sdata->vif.bss_conf.use_short_preamble &&
646 (ieee80211_is_data(hdr->frame_control) ||
647 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
648 txrc.short_preamble = short_preamble = true;
650 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
653 * Lets not bother rate control if we're associated and cannot
654 * talk to the sta. This should not happen.
656 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
657 (sta_flags & WLAN_STA_ASSOC) &&
658 !rate_usable_index_exists(sband, &tx->sta->sta),
659 "%s: Dropped data frame as no usable bitrate found while "
660 "scanning and associated. Target station: "
661 "%pM on %d GHz band\n",
662 tx->sdata->name, hdr->addr1,
663 tx->channel->band ? 5 : 2))
664 return TX_DROP;
667 * If we're associated with the sta at this point we know we can at
668 * least send the frame at the lowest bit rate.
670 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
672 if (unlikely(info->control.rates[0].idx < 0))
673 return TX_DROP;
675 if (txrc.reported_rate.idx < 0) {
676 txrc.reported_rate = info->control.rates[0];
677 if (tx->sta && ieee80211_is_data(hdr->frame_control))
678 tx->sta->last_tx_rate = txrc.reported_rate;
679 } else if (tx->sta)
680 tx->sta->last_tx_rate = txrc.reported_rate;
682 if (unlikely(!info->control.rates[0].count))
683 info->control.rates[0].count = 1;
685 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
686 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
687 info->control.rates[0].count = 1;
689 if (is_multicast_ether_addr(hdr->addr1)) {
691 * XXX: verify the rate is in the basic rateset
693 return TX_CONTINUE;
697 * set up the RTS/CTS rate as the fastest basic rate
698 * that is not faster than the data rate
700 * XXX: Should this check all retry rates?
702 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
703 s8 baserate = 0;
705 rate = &sband->bitrates[info->control.rates[0].idx];
707 for (i = 0; i < sband->n_bitrates; i++) {
708 /* must be a basic rate */
709 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
710 continue;
711 /* must not be faster than the data rate */
712 if (sband->bitrates[i].bitrate > rate->bitrate)
713 continue;
714 /* maximum */
715 if (sband->bitrates[baserate].bitrate <
716 sband->bitrates[i].bitrate)
717 baserate = i;
720 info->control.rts_cts_rate_idx = baserate;
723 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
725 * make sure there's no valid rate following
726 * an invalid one, just in case drivers don't
727 * take the API seriously to stop at -1.
729 if (inval) {
730 info->control.rates[i].idx = -1;
731 continue;
733 if (info->control.rates[i].idx < 0) {
734 inval = true;
735 continue;
739 * For now assume MCS is already set up correctly, this
740 * needs to be fixed.
742 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
743 WARN_ON(info->control.rates[i].idx > 76);
744 continue;
747 /* set up RTS protection if desired */
748 if (rts)
749 info->control.rates[i].flags |=
750 IEEE80211_TX_RC_USE_RTS_CTS;
752 /* RC is busted */
753 if (WARN_ON_ONCE(info->control.rates[i].idx >=
754 sband->n_bitrates)) {
755 info->control.rates[i].idx = -1;
756 continue;
759 rate = &sband->bitrates[info->control.rates[i].idx];
761 /* set up short preamble */
762 if (short_preamble &&
763 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
764 info->control.rates[i].flags |=
765 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
767 /* set up G protection */
768 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
769 rate->flags & IEEE80211_RATE_ERP_G)
770 info->control.rates[i].flags |=
771 IEEE80211_TX_RC_USE_CTS_PROTECT;
774 return TX_CONTINUE;
777 static ieee80211_tx_result debug_noinline
778 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
780 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
781 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
782 u16 *seq;
783 u8 *qc;
784 int tid;
787 * Packet injection may want to control the sequence
788 * number, if we have no matching interface then we
789 * neither assign one ourselves nor ask the driver to.
791 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
792 return TX_CONTINUE;
794 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
795 return TX_CONTINUE;
797 if (ieee80211_hdrlen(hdr->frame_control) < 24)
798 return TX_CONTINUE;
801 * Anything but QoS data that has a sequence number field
802 * (is long enough) gets a sequence number from the global
803 * counter.
805 if (!ieee80211_is_data_qos(hdr->frame_control)) {
806 /* driver should assign sequence number */
807 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
808 /* for pure STA mode without beacons, we can do it */
809 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
810 tx->sdata->sequence_number += 0x10;
811 return TX_CONTINUE;
815 * This should be true for injected/management frames only, for
816 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
817 * above since they are not QoS-data frames.
819 if (!tx->sta)
820 return TX_CONTINUE;
822 /* include per-STA, per-TID sequence counter */
824 qc = ieee80211_get_qos_ctl(hdr);
825 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
826 seq = &tx->sta->tid_seq[tid];
828 hdr->seq_ctrl = cpu_to_le16(*seq);
830 /* Increase the sequence number. */
831 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
833 return TX_CONTINUE;
836 static int ieee80211_fragment(struct ieee80211_local *local,
837 struct sk_buff *skb, int hdrlen,
838 int frag_threshold)
840 struct sk_buff *tail = skb, *tmp;
841 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
842 int pos = hdrlen + per_fragm;
843 int rem = skb->len - hdrlen - per_fragm;
845 if (WARN_ON(rem < 0))
846 return -EINVAL;
848 while (rem) {
849 int fraglen = per_fragm;
851 if (fraglen > rem)
852 fraglen = rem;
853 rem -= fraglen;
854 tmp = dev_alloc_skb(local->tx_headroom +
855 frag_threshold +
856 IEEE80211_ENCRYPT_HEADROOM +
857 IEEE80211_ENCRYPT_TAILROOM);
858 if (!tmp)
859 return -ENOMEM;
860 tail->next = tmp;
861 tail = tmp;
862 skb_reserve(tmp, local->tx_headroom +
863 IEEE80211_ENCRYPT_HEADROOM);
864 /* copy control information */
865 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
866 skb_copy_queue_mapping(tmp, skb);
867 tmp->priority = skb->priority;
868 tmp->dev = skb->dev;
870 /* copy header and data */
871 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
872 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
874 pos += fraglen;
877 skb->len = hdrlen + per_fragm;
878 return 0;
881 static ieee80211_tx_result debug_noinline
882 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
884 struct sk_buff *skb = tx->skb;
885 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
886 struct ieee80211_hdr *hdr = (void *)skb->data;
887 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
888 int hdrlen;
889 int fragnum;
891 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
892 return TX_CONTINUE;
895 * Warn when submitting a fragmented A-MPDU frame and drop it.
896 * This scenario is handled in ieee80211_tx_prepare but extra
897 * caution taken here as fragmented ampdu may cause Tx stop.
899 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
900 return TX_DROP;
902 hdrlen = ieee80211_hdrlen(hdr->frame_control);
904 /* internal error, why is TX_FRAGMENTED set? */
905 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
906 return TX_DROP;
909 * Now fragment the frame. This will allocate all the fragments and
910 * chain them (using skb as the first fragment) to skb->next.
911 * During transmission, we will remove the successfully transmitted
912 * fragments from this list. When the low-level driver rejects one
913 * of the fragments then we will simply pretend to accept the skb
914 * but store it away as pending.
916 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
917 return TX_DROP;
919 /* update duration/seq/flags of fragments */
920 fragnum = 0;
921 do {
922 int next_len;
923 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
925 hdr = (void *)skb->data;
926 info = IEEE80211_SKB_CB(skb);
928 if (skb->next) {
929 hdr->frame_control |= morefrags;
930 next_len = skb->next->len;
932 * No multi-rate retries for fragmented frames, that
933 * would completely throw off the NAV at other STAs.
935 info->control.rates[1].idx = -1;
936 info->control.rates[2].idx = -1;
937 info->control.rates[3].idx = -1;
938 info->control.rates[4].idx = -1;
939 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
940 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
941 } else {
942 hdr->frame_control &= ~morefrags;
943 next_len = 0;
945 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
946 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
947 fragnum++;
948 } while ((skb = skb->next));
950 return TX_CONTINUE;
953 static ieee80211_tx_result debug_noinline
954 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
956 struct sk_buff *skb = tx->skb;
958 if (!tx->sta)
959 return TX_CONTINUE;
961 tx->sta->tx_packets++;
962 do {
963 tx->sta->tx_fragments++;
964 tx->sta->tx_bytes += skb->len;
965 } while ((skb = skb->next));
967 return TX_CONTINUE;
970 static ieee80211_tx_result debug_noinline
971 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
973 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
975 if (!tx->key)
976 return TX_CONTINUE;
978 switch (tx->key->conf.cipher) {
979 case WLAN_CIPHER_SUITE_WEP40:
980 case WLAN_CIPHER_SUITE_WEP104:
981 return ieee80211_crypto_wep_encrypt(tx);
982 case WLAN_CIPHER_SUITE_TKIP:
983 return ieee80211_crypto_tkip_encrypt(tx);
984 case WLAN_CIPHER_SUITE_CCMP:
985 return ieee80211_crypto_ccmp_encrypt(tx);
986 case WLAN_CIPHER_SUITE_AES_CMAC:
987 return ieee80211_crypto_aes_cmac_encrypt(tx);
988 default:
989 /* handle hw-only algorithm */
990 if (info->control.hw_key) {
991 ieee80211_tx_set_protected(tx);
992 return TX_CONTINUE;
994 break;
998 return TX_DROP;
1001 static ieee80211_tx_result debug_noinline
1002 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1004 struct sk_buff *skb = tx->skb;
1005 struct ieee80211_hdr *hdr;
1006 int next_len;
1007 bool group_addr;
1009 do {
1010 hdr = (void *) skb->data;
1011 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1012 break; /* must not overwrite AID */
1013 next_len = skb->next ? skb->next->len : 0;
1014 group_addr = is_multicast_ether_addr(hdr->addr1);
1016 hdr->duration_id =
1017 ieee80211_duration(tx, group_addr, next_len);
1018 } while ((skb = skb->next));
1020 return TX_CONTINUE;
1023 /* actual transmit path */
1026 * deal with packet injection down monitor interface
1027 * with Radiotap Header -- only called for monitor mode interface
1029 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
1030 struct sk_buff *skb)
1033 * this is the moment to interpret and discard the radiotap header that
1034 * must be at the start of the packet injected in Monitor mode
1036 * Need to take some care with endian-ness since radiotap
1037 * args are little-endian
1040 struct ieee80211_radiotap_iterator iterator;
1041 struct ieee80211_radiotap_header *rthdr =
1042 (struct ieee80211_radiotap_header *) skb->data;
1043 bool hw_frag;
1044 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1045 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1046 NULL);
1048 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1049 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1051 /* packet is fragmented in HW if we have a non-NULL driver callback */
1052 hw_frag = (tx->local->ops->set_frag_threshold != NULL);
1055 * for every radiotap entry that is present
1056 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1057 * entries present, or -EINVAL on error)
1060 while (!ret) {
1061 ret = ieee80211_radiotap_iterator_next(&iterator);
1063 if (ret)
1064 continue;
1066 /* see if this argument is something we can use */
1067 switch (iterator.this_arg_index) {
1069 * You must take care when dereferencing iterator.this_arg
1070 * for multibyte types... the pointer is not aligned. Use
1071 * get_unaligned((type *)iterator.this_arg) to dereference
1072 * iterator.this_arg for type "type" safely on all arches.
1074 case IEEE80211_RADIOTAP_FLAGS:
1075 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1077 * this indicates that the skb we have been
1078 * handed has the 32-bit FCS CRC at the end...
1079 * we should react to that by snipping it off
1080 * because it will be recomputed and added
1081 * on transmission
1083 if (skb->len < (iterator._max_length + FCS_LEN))
1084 return false;
1086 skb_trim(skb, skb->len - FCS_LEN);
1088 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1089 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1090 if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
1091 !hw_frag)
1092 tx->flags |= IEEE80211_TX_FRAGMENTED;
1093 break;
1096 * Please update the file
1097 * Documentation/networking/mac80211-injection.txt
1098 * when parsing new fields here.
1101 default:
1102 break;
1106 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1107 return false;
1110 * remove the radiotap header
1111 * iterator->_max_length was sanity-checked against
1112 * skb->len by iterator init
1114 skb_pull(skb, iterator._max_length);
1116 return true;
1119 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1120 struct sk_buff *skb,
1121 struct ieee80211_tx_info *info,
1122 struct tid_ampdu_tx *tid_tx,
1123 int tid)
1125 bool queued = false;
1127 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1128 info->flags |= IEEE80211_TX_CTL_AMPDU;
1129 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1131 * nothing -- this aggregation session is being started
1132 * but that might still fail with the driver
1134 } else {
1135 spin_lock(&tx->sta->lock);
1137 * Need to re-check now, because we may get here
1139 * 1) in the window during which the setup is actually
1140 * already done, but not marked yet because not all
1141 * packets are spliced over to the driver pending
1142 * queue yet -- if this happened we acquire the lock
1143 * either before or after the splice happens, but
1144 * need to recheck which of these cases happened.
1146 * 2) during session teardown, if the OPERATIONAL bit
1147 * was cleared due to the teardown but the pointer
1148 * hasn't been assigned NULL yet (or we loaded it
1149 * before it was assigned) -- in this case it may
1150 * now be NULL which means we should just let the
1151 * packet pass through because splicing the frames
1152 * back is already done.
1154 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1156 if (!tid_tx) {
1157 /* do nothing, let packet pass through */
1158 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1159 info->flags |= IEEE80211_TX_CTL_AMPDU;
1160 } else {
1161 queued = true;
1162 info->control.vif = &tx->sdata->vif;
1163 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1164 __skb_queue_tail(&tid_tx->pending, skb);
1166 spin_unlock(&tx->sta->lock);
1169 return queued;
1173 * initialises @tx
1175 static ieee80211_tx_result
1176 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1177 struct ieee80211_tx_data *tx,
1178 struct sk_buff *skb)
1180 struct ieee80211_local *local = sdata->local;
1181 struct ieee80211_hdr *hdr;
1182 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1183 int hdrlen, tid;
1184 u8 *qc;
1186 memset(tx, 0, sizeof(*tx));
1187 tx->skb = skb;
1188 tx->local = local;
1189 tx->sdata = sdata;
1190 tx->channel = local->hw.conf.channel;
1192 * Set this flag (used below to indicate "automatic fragmentation"),
1193 * it will be cleared/left by radiotap as desired.
1194 * Only valid when fragmentation is done by the stack.
1196 if (!local->ops->set_frag_threshold)
1197 tx->flags |= IEEE80211_TX_FRAGMENTED;
1199 /* process and remove the injection radiotap header */
1200 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1201 if (!__ieee80211_parse_tx_radiotap(tx, skb))
1202 return TX_DROP;
1205 * __ieee80211_parse_tx_radiotap has now removed
1206 * the radiotap header that was present and pre-filled
1207 * 'tx' with tx control information.
1209 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1213 * If this flag is set to true anywhere, and we get here,
1214 * we are doing the needed processing, so remove the flag
1215 * now.
1217 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1219 hdr = (struct ieee80211_hdr *) skb->data;
1221 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1222 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1223 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1224 return TX_DROP;
1225 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1226 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1228 if (!tx->sta)
1229 tx->sta = sta_info_get(sdata, hdr->addr1);
1231 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1232 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1233 struct tid_ampdu_tx *tid_tx;
1235 qc = ieee80211_get_qos_ctl(hdr);
1236 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1238 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1239 if (tid_tx) {
1240 bool queued;
1242 queued = ieee80211_tx_prep_agg(tx, skb, info,
1243 tid_tx, tid);
1245 if (unlikely(queued))
1246 return TX_QUEUED;
1250 if (is_multicast_ether_addr(hdr->addr1)) {
1251 tx->flags &= ~IEEE80211_TX_UNICAST;
1252 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1253 } else {
1254 tx->flags |= IEEE80211_TX_UNICAST;
1255 if (unlikely(local->wifi_wme_noack_test))
1256 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1257 else
1258 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1261 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1262 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1263 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1264 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1265 tx->flags |= IEEE80211_TX_FRAGMENTED;
1266 else
1267 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1270 if (!tx->sta)
1271 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1272 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1273 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1275 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1276 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1277 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1278 tx->ethertype = (pos[0] << 8) | pos[1];
1280 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1282 return TX_CONTINUE;
1286 * Returns false if the frame couldn't be transmitted but was queued instead.
1288 static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff **skbp,
1289 struct sta_info *sta, bool txpending)
1291 struct sk_buff *skb = *skbp, *next;
1292 struct ieee80211_tx_info *info;
1293 struct ieee80211_sub_if_data *sdata;
1294 unsigned long flags;
1295 int len;
1296 bool fragm = false;
1298 while (skb) {
1299 int q = skb_get_queue_mapping(skb);
1300 __le16 fc;
1302 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1303 if (local->queue_stop_reasons[q] ||
1304 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1306 * Since queue is stopped, queue up frames for later
1307 * transmission from the tx-pending tasklet when the
1308 * queue is woken again.
1311 do {
1312 next = skb->next;
1313 skb->next = NULL;
1315 * NB: If txpending is true, next must already
1316 * be NULL since we must've gone through this
1317 * loop before already; therefore we can just
1318 * queue the frame to the head without worrying
1319 * about reordering of fragments.
1321 if (unlikely(txpending))
1322 __skb_queue_head(&local->pending[q],
1323 skb);
1324 else
1325 __skb_queue_tail(&local->pending[q],
1326 skb);
1327 } while ((skb = next));
1329 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1330 flags);
1331 return false;
1333 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1335 info = IEEE80211_SKB_CB(skb);
1337 if (fragm)
1338 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1339 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1341 next = skb->next;
1342 len = skb->len;
1344 if (next)
1345 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1347 sdata = vif_to_sdata(info->control.vif);
1349 switch (sdata->vif.type) {
1350 case NL80211_IFTYPE_MONITOR:
1351 info->control.vif = NULL;
1352 break;
1353 case NL80211_IFTYPE_AP_VLAN:
1354 info->control.vif = &container_of(sdata->bss,
1355 struct ieee80211_sub_if_data, u.ap)->vif;
1356 break;
1357 default:
1358 /* keep */
1359 break;
1362 if (sta && sta->uploaded)
1363 info->control.sta = &sta->sta;
1364 else
1365 info->control.sta = NULL;
1367 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1368 drv_tx(local, skb);
1370 ieee80211_tpt_led_trig_tx(local, fc, len);
1371 *skbp = skb = next;
1372 ieee80211_led_tx(local, 1);
1373 fragm = true;
1376 return true;
1380 * Invoke TX handlers, return 0 on success and non-zero if the
1381 * frame was dropped or queued.
1383 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1385 struct sk_buff *skb = tx->skb;
1386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1387 ieee80211_tx_result res = TX_DROP;
1389 #define CALL_TXH(txh) \
1390 do { \
1391 res = txh(tx); \
1392 if (res != TX_CONTINUE) \
1393 goto txh_done; \
1394 } while (0)
1396 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1397 CALL_TXH(ieee80211_tx_h_check_assoc);
1398 CALL_TXH(ieee80211_tx_h_ps_buf);
1399 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1400 CALL_TXH(ieee80211_tx_h_select_key);
1401 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1402 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1404 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1405 goto txh_done;
1407 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1408 CALL_TXH(ieee80211_tx_h_sequence);
1409 CALL_TXH(ieee80211_tx_h_fragment);
1410 /* handlers after fragment must be aware of tx info fragmentation! */
1411 CALL_TXH(ieee80211_tx_h_stats);
1412 CALL_TXH(ieee80211_tx_h_encrypt);
1413 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1414 CALL_TXH(ieee80211_tx_h_calculate_duration);
1415 #undef CALL_TXH
1417 txh_done:
1418 if (unlikely(res == TX_DROP)) {
1419 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1420 while (skb) {
1421 struct sk_buff *next;
1423 next = skb->next;
1424 dev_kfree_skb(skb);
1425 skb = next;
1427 return -1;
1428 } else if (unlikely(res == TX_QUEUED)) {
1429 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1430 return -1;
1433 return 0;
1437 * Returns false if the frame couldn't be transmitted but was queued instead.
1439 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1440 struct sk_buff *skb, bool txpending)
1442 struct ieee80211_local *local = sdata->local;
1443 struct ieee80211_tx_data tx;
1444 ieee80211_tx_result res_prepare;
1445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1446 bool result = true;
1448 if (unlikely(skb->len < 10)) {
1449 dev_kfree_skb(skb);
1450 return true;
1453 rcu_read_lock();
1455 /* initialises tx */
1456 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1458 if (unlikely(res_prepare == TX_DROP)) {
1459 dev_kfree_skb(skb);
1460 goto out;
1461 } else if (unlikely(res_prepare == TX_QUEUED)) {
1462 goto out;
1465 tx.channel = local->hw.conf.channel;
1466 info->band = tx.channel->band;
1468 if (!invoke_tx_handlers(&tx))
1469 result = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1470 out:
1471 rcu_read_unlock();
1472 return result;
1475 /* device xmit handlers */
1477 static int ieee80211_skb_resize(struct ieee80211_local *local,
1478 struct sk_buff *skb,
1479 int head_need, bool may_encrypt)
1481 int tail_need = 0;
1484 * This could be optimised, devices that do full hardware
1485 * crypto (including TKIP MMIC) need no tailroom... But we
1486 * have no drivers for such devices currently.
1488 if (may_encrypt) {
1489 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1490 tail_need -= skb_tailroom(skb);
1491 tail_need = max_t(int, tail_need, 0);
1494 if (head_need || tail_need) {
1495 /* Sorry. Can't account for this any more */
1496 skb_orphan(skb);
1499 if (skb_cloned(skb))
1500 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1501 else if (head_need || tail_need)
1502 I802_DEBUG_INC(local->tx_expand_skb_head);
1503 else
1504 return 0;
1506 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1507 wiphy_debug(local->hw.wiphy,
1508 "failed to reallocate TX buffer\n");
1509 return -ENOMEM;
1512 /* update truesize too */
1513 skb->truesize += head_need + tail_need;
1515 return 0;
1518 static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1519 struct sk_buff *skb)
1521 struct ieee80211_local *local = sdata->local;
1522 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1523 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1524 struct ieee80211_sub_if_data *tmp_sdata;
1525 int headroom;
1526 bool may_encrypt;
1528 rcu_read_lock();
1530 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1531 int hdrlen;
1532 u16 len_rthdr;
1534 info->flags |= IEEE80211_TX_CTL_INJECTED |
1535 IEEE80211_TX_INTFL_HAS_RADIOTAP;
1537 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1538 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1539 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1541 /* check the header is complete in the frame */
1542 if (likely(skb->len >= len_rthdr + hdrlen)) {
1544 * We process outgoing injected frames that have a
1545 * local address we handle as though they are our
1546 * own frames.
1547 * This code here isn't entirely correct, the local
1548 * MAC address is not necessarily enough to find
1549 * the interface to use; for that proper VLAN/WDS
1550 * support we will need a different mechanism.
1553 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1554 list) {
1555 if (!ieee80211_sdata_running(tmp_sdata))
1556 continue;
1557 if (tmp_sdata->vif.type ==
1558 NL80211_IFTYPE_MONITOR ||
1559 tmp_sdata->vif.type ==
1560 NL80211_IFTYPE_AP_VLAN ||
1561 tmp_sdata->vif.type ==
1562 NL80211_IFTYPE_WDS)
1563 continue;
1564 if (compare_ether_addr(tmp_sdata->vif.addr,
1565 hdr->addr2) == 0) {
1566 sdata = tmp_sdata;
1567 break;
1573 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1575 headroom = local->tx_headroom;
1576 if (may_encrypt)
1577 headroom += IEEE80211_ENCRYPT_HEADROOM;
1578 headroom -= skb_headroom(skb);
1579 headroom = max_t(int, 0, headroom);
1581 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1582 dev_kfree_skb(skb);
1583 rcu_read_unlock();
1584 return;
1587 hdr = (struct ieee80211_hdr *) skb->data;
1588 info->control.vif = &sdata->vif;
1590 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1591 ieee80211_is_data(hdr->frame_control) &&
1592 !is_multicast_ether_addr(hdr->addr1))
1593 if (mesh_nexthop_lookup(skb, sdata)) {
1594 /* skb queued: don't free */
1595 rcu_read_unlock();
1596 return;
1599 ieee80211_set_qos_hdr(local, skb);
1600 ieee80211_tx(sdata, skb, false);
1601 rcu_read_unlock();
1604 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1605 struct net_device *dev)
1607 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1608 struct ieee80211_channel *chan = local->hw.conf.channel;
1609 struct ieee80211_radiotap_header *prthdr =
1610 (struct ieee80211_radiotap_header *)skb->data;
1611 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1612 u16 len_rthdr;
1615 * Frame injection is not allowed if beaconing is not allowed
1616 * or if we need radar detection. Beaconing is usually not allowed when
1617 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1618 * Passive scan is also used in world regulatory domains where
1619 * your country is not known and as such it should be treated as
1620 * NO TX unless the channel is explicitly allowed in which case
1621 * your current regulatory domain would not have the passive scan
1622 * flag.
1624 * Since AP mode uses monitor interfaces to inject/TX management
1625 * frames we can make AP mode the exception to this rule once it
1626 * supports radar detection as its implementation can deal with
1627 * radar detection by itself. We can do that later by adding a
1628 * monitor flag interfaces used for AP support.
1630 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1631 IEEE80211_CHAN_PASSIVE_SCAN)))
1632 goto fail;
1634 /* check for not even having the fixed radiotap header part */
1635 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1636 goto fail; /* too short to be possibly valid */
1638 /* is it a header version we can trust to find length from? */
1639 if (unlikely(prthdr->it_version))
1640 goto fail; /* only version 0 is supported */
1642 /* then there must be a radiotap header with a length we can use */
1643 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1645 /* does the skb contain enough to deliver on the alleged length? */
1646 if (unlikely(skb->len < len_rthdr))
1647 goto fail; /* skb too short for claimed rt header extent */
1650 * fix up the pointers accounting for the radiotap
1651 * header still being in there. We are being given
1652 * a precooked IEEE80211 header so no need for
1653 * normal processing
1655 skb_set_mac_header(skb, len_rthdr);
1657 * these are just fixed to the end of the rt area since we
1658 * don't have any better information and at this point, nobody cares
1660 skb_set_network_header(skb, len_rthdr);
1661 skb_set_transport_header(skb, len_rthdr);
1663 memset(info, 0, sizeof(*info));
1665 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1667 /* pass the radiotap header up to xmit */
1668 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1669 return NETDEV_TX_OK;
1671 fail:
1672 dev_kfree_skb(skb);
1673 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1677 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1678 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1679 * @skb: packet to be sent
1680 * @dev: incoming interface
1682 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1683 * not be freed, and caller is responsible for either retrying later or freeing
1684 * skb).
1686 * This function takes in an Ethernet header and encapsulates it with suitable
1687 * IEEE 802.11 header based on which interface the packet is coming in. The
1688 * encapsulated packet will then be passed to master interface, wlan#.11, for
1689 * transmission (through low-level driver).
1691 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1692 struct net_device *dev)
1694 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1695 struct ieee80211_local *local = sdata->local;
1696 struct ieee80211_tx_info *info;
1697 int ret = NETDEV_TX_BUSY, head_need;
1698 u16 ethertype, hdrlen, meshhdrlen = 0;
1699 __le16 fc;
1700 struct ieee80211_hdr hdr;
1701 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1702 struct mesh_path __maybe_unused *mppath = NULL;
1703 const u8 *encaps_data;
1704 int encaps_len, skip_header_bytes;
1705 int nh_pos, h_pos;
1706 struct sta_info *sta = NULL;
1707 u32 sta_flags = 0;
1708 struct sk_buff *tmp_skb;
1710 if (unlikely(skb->len < ETH_HLEN)) {
1711 ret = NETDEV_TX_OK;
1712 goto fail;
1715 /* convert Ethernet header to proper 802.11 header (based on
1716 * operation mode) */
1717 ethertype = (skb->data[12] << 8) | skb->data[13];
1718 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1720 switch (sdata->vif.type) {
1721 case NL80211_IFTYPE_AP_VLAN:
1722 rcu_read_lock();
1723 sta = rcu_dereference(sdata->u.vlan.sta);
1724 if (sta) {
1725 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1726 /* RA TA DA SA */
1727 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1728 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1729 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1730 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1731 hdrlen = 30;
1732 sta_flags = get_sta_flags(sta);
1734 rcu_read_unlock();
1735 if (sta)
1736 break;
1737 /* fall through */
1738 case NL80211_IFTYPE_AP:
1739 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1740 /* DA BSSID SA */
1741 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1742 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1743 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1744 hdrlen = 24;
1745 break;
1746 case NL80211_IFTYPE_WDS:
1747 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1748 /* RA TA DA SA */
1749 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1750 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1751 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1752 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1753 hdrlen = 30;
1754 break;
1755 #ifdef CONFIG_MAC80211_MESH
1756 case NL80211_IFTYPE_MESH_POINT:
1757 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1758 /* Do not send frames with mesh_ttl == 0 */
1759 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1760 ret = NETDEV_TX_OK;
1761 goto fail;
1763 rcu_read_lock();
1764 if (!is_multicast_ether_addr(skb->data))
1765 mppath = mpp_path_lookup(skb->data, sdata);
1768 * Use address extension if it is a packet from
1769 * another interface or if we know the destination
1770 * is being proxied by a portal (i.e. portal address
1771 * differs from proxied address)
1773 if (compare_ether_addr(sdata->vif.addr,
1774 skb->data + ETH_ALEN) == 0 &&
1775 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1776 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1777 skb->data, skb->data + ETH_ALEN);
1778 rcu_read_unlock();
1779 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1780 sdata, NULL, NULL);
1781 } else {
1782 int is_mesh_mcast = 1;
1783 const u8 *mesh_da;
1785 if (is_multicast_ether_addr(skb->data))
1786 /* DA TA mSA AE:SA */
1787 mesh_da = skb->data;
1788 else {
1789 static const u8 bcast[ETH_ALEN] =
1790 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1791 if (mppath) {
1792 /* RA TA mDA mSA AE:DA SA */
1793 mesh_da = mppath->mpp;
1794 is_mesh_mcast = 0;
1795 } else {
1796 /* DA TA mSA AE:SA */
1797 mesh_da = bcast;
1800 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1801 mesh_da, sdata->vif.addr);
1802 rcu_read_unlock();
1803 if (is_mesh_mcast)
1804 meshhdrlen =
1805 ieee80211_new_mesh_header(&mesh_hdr,
1806 sdata,
1807 skb->data + ETH_ALEN,
1808 NULL);
1809 else
1810 meshhdrlen =
1811 ieee80211_new_mesh_header(&mesh_hdr,
1812 sdata,
1813 skb->data,
1814 skb->data + ETH_ALEN);
1817 break;
1818 #endif
1819 case NL80211_IFTYPE_STATION:
1820 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1821 if (sdata->u.mgd.use_4addr &&
1822 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1823 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1824 /* RA TA DA SA */
1825 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1826 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1827 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1828 hdrlen = 30;
1829 } else {
1830 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1831 /* BSSID SA DA */
1832 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1833 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1834 hdrlen = 24;
1836 break;
1837 case NL80211_IFTYPE_ADHOC:
1838 /* DA SA BSSID */
1839 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1840 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1841 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1842 hdrlen = 24;
1843 break;
1844 default:
1845 ret = NETDEV_TX_OK;
1846 goto fail;
1850 * There's no need to try to look up the destination
1851 * if it is a multicast address (which can only happen
1852 * in AP mode)
1854 if (!is_multicast_ether_addr(hdr.addr1)) {
1855 rcu_read_lock();
1856 sta = sta_info_get(sdata, hdr.addr1);
1857 if (sta)
1858 sta_flags = get_sta_flags(sta);
1859 rcu_read_unlock();
1862 /* receiver and we are QoS enabled, use a QoS type frame */
1863 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1864 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1865 hdrlen += 2;
1869 * Drop unicast frames to unauthorised stations unless they are
1870 * EAPOL frames from the local station.
1872 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1873 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1874 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1875 !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1876 compare_ether_addr(sdata->vif.addr,
1877 skb->data + ETH_ALEN) == 0))) {
1878 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1879 if (net_ratelimit())
1880 printk(KERN_DEBUG "%s: dropped frame to %pM"
1881 " (unauthorized port)\n", dev->name,
1882 hdr.addr1);
1883 #endif
1885 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1887 ret = NETDEV_TX_OK;
1888 goto fail;
1892 * If the skb is shared we need to obtain our own copy.
1894 if (skb_shared(skb)) {
1895 tmp_skb = skb;
1896 skb = skb_clone(skb, GFP_ATOMIC);
1897 kfree_skb(tmp_skb);
1899 if (!skb) {
1900 ret = NETDEV_TX_OK;
1901 goto fail;
1905 hdr.frame_control = fc;
1906 hdr.duration_id = 0;
1907 hdr.seq_ctrl = 0;
1909 skip_header_bytes = ETH_HLEN;
1910 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1911 encaps_data = bridge_tunnel_header;
1912 encaps_len = sizeof(bridge_tunnel_header);
1913 skip_header_bytes -= 2;
1914 } else if (ethertype >= 0x600) {
1915 encaps_data = rfc1042_header;
1916 encaps_len = sizeof(rfc1042_header);
1917 skip_header_bytes -= 2;
1918 } else {
1919 encaps_data = NULL;
1920 encaps_len = 0;
1923 nh_pos = skb_network_header(skb) - skb->data;
1924 h_pos = skb_transport_header(skb) - skb->data;
1926 skb_pull(skb, skip_header_bytes);
1927 nh_pos -= skip_header_bytes;
1928 h_pos -= skip_header_bytes;
1930 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1933 * So we need to modify the skb header and hence need a copy of
1934 * that. The head_need variable above doesn't, so far, include
1935 * the needed header space that we don't need right away. If we
1936 * can, then we don't reallocate right now but only after the
1937 * frame arrives at the master device (if it does...)
1939 * If we cannot, however, then we will reallocate to include all
1940 * the ever needed space. Also, if we need to reallocate it anyway,
1941 * make it big enough for everything we may ever need.
1944 if (head_need > 0 || skb_cloned(skb)) {
1945 head_need += IEEE80211_ENCRYPT_HEADROOM;
1946 head_need += local->tx_headroom;
1947 head_need = max_t(int, 0, head_need);
1948 if (ieee80211_skb_resize(local, skb, head_need, true))
1949 goto fail;
1952 if (encaps_data) {
1953 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1954 nh_pos += encaps_len;
1955 h_pos += encaps_len;
1958 #ifdef CONFIG_MAC80211_MESH
1959 if (meshhdrlen > 0) {
1960 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1961 nh_pos += meshhdrlen;
1962 h_pos += meshhdrlen;
1964 #endif
1966 if (ieee80211_is_data_qos(fc)) {
1967 __le16 *qos_control;
1969 qos_control = (__le16*) skb_push(skb, 2);
1970 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1972 * Maybe we could actually set some fields here, for now just
1973 * initialise to zero to indicate no special operation.
1975 *qos_control = 0;
1976 } else
1977 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1979 nh_pos += hdrlen;
1980 h_pos += hdrlen;
1982 dev->stats.tx_packets++;
1983 dev->stats.tx_bytes += skb->len;
1985 /* Update skb pointers to various headers since this modified frame
1986 * is going to go through Linux networking code that may potentially
1987 * need things like pointer to IP header. */
1988 skb_set_mac_header(skb, 0);
1989 skb_set_network_header(skb, nh_pos);
1990 skb_set_transport_header(skb, h_pos);
1992 info = IEEE80211_SKB_CB(skb);
1993 memset(info, 0, sizeof(*info));
1995 dev->trans_start = jiffies;
1996 ieee80211_xmit(sdata, skb);
1998 return NETDEV_TX_OK;
2000 fail:
2001 if (ret == NETDEV_TX_OK)
2002 dev_kfree_skb(skb);
2004 return ret;
2009 * ieee80211_clear_tx_pending may not be called in a context where
2010 * it is possible that it packets could come in again.
2012 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2014 int i;
2016 for (i = 0; i < local->hw.queues; i++)
2017 skb_queue_purge(&local->pending[i]);
2021 * Returns false if the frame couldn't be transmitted but was queued instead,
2022 * which in this case means re-queued -- take as an indication to stop sending
2023 * more pending frames.
2025 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2026 struct sk_buff *skb)
2028 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2029 struct ieee80211_sub_if_data *sdata;
2030 struct sta_info *sta;
2031 struct ieee80211_hdr *hdr;
2032 bool result;
2034 sdata = vif_to_sdata(info->control.vif);
2036 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2037 result = ieee80211_tx(sdata, skb, true);
2038 } else {
2039 hdr = (struct ieee80211_hdr *)skb->data;
2040 sta = sta_info_get(sdata, hdr->addr1);
2042 result = __ieee80211_tx(local, &skb, sta, true);
2045 return result;
2049 * Transmit all pending packets. Called from tasklet.
2051 void ieee80211_tx_pending(unsigned long data)
2053 struct ieee80211_local *local = (struct ieee80211_local *)data;
2054 struct ieee80211_sub_if_data *sdata;
2055 unsigned long flags;
2056 int i;
2057 bool txok;
2059 rcu_read_lock();
2061 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2062 for (i = 0; i < local->hw.queues; i++) {
2064 * If queue is stopped by something other than due to pending
2065 * frames, or we have no pending frames, proceed to next queue.
2067 if (local->queue_stop_reasons[i] ||
2068 skb_queue_empty(&local->pending[i]))
2069 continue;
2071 while (!skb_queue_empty(&local->pending[i])) {
2072 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2073 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2075 if (WARN_ON(!info->control.vif)) {
2076 kfree_skb(skb);
2077 continue;
2080 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2081 flags);
2083 txok = ieee80211_tx_pending_skb(local, skb);
2084 spin_lock_irqsave(&local->queue_stop_reason_lock,
2085 flags);
2086 if (!txok)
2087 break;
2090 if (skb_queue_empty(&local->pending[i]))
2091 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2092 netif_wake_subqueue(sdata->dev, i);
2094 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2096 rcu_read_unlock();
2099 /* functions for drivers to get certain frames */
2101 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2102 struct sk_buff *skb,
2103 struct beacon_data *beacon)
2105 u8 *pos, *tim;
2106 int aid0 = 0;
2107 int i, have_bits = 0, n1, n2;
2109 /* Generate bitmap for TIM only if there are any STAs in power save
2110 * mode. */
2111 if (atomic_read(&bss->num_sta_ps) > 0)
2112 /* in the hope that this is faster than
2113 * checking byte-for-byte */
2114 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2115 IEEE80211_MAX_AID+1);
2117 if (bss->dtim_count == 0)
2118 bss->dtim_count = beacon->dtim_period - 1;
2119 else
2120 bss->dtim_count--;
2122 tim = pos = (u8 *) skb_put(skb, 6);
2123 *pos++ = WLAN_EID_TIM;
2124 *pos++ = 4;
2125 *pos++ = bss->dtim_count;
2126 *pos++ = beacon->dtim_period;
2128 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2129 aid0 = 1;
2131 bss->dtim_bc_mc = aid0 == 1;
2133 if (have_bits) {
2134 /* Find largest even number N1 so that bits numbered 1 through
2135 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2136 * (N2 + 1) x 8 through 2007 are 0. */
2137 n1 = 0;
2138 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2139 if (bss->tim[i]) {
2140 n1 = i & 0xfe;
2141 break;
2144 n2 = n1;
2145 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2146 if (bss->tim[i]) {
2147 n2 = i;
2148 break;
2152 /* Bitmap control */
2153 *pos++ = n1 | aid0;
2154 /* Part Virt Bitmap */
2155 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2157 tim[1] = n2 - n1 + 4;
2158 skb_put(skb, n2 - n1);
2159 } else {
2160 *pos++ = aid0; /* Bitmap control */
2161 *pos++ = 0; /* Part Virt Bitmap */
2165 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2166 struct ieee80211_vif *vif,
2167 u16 *tim_offset, u16 *tim_length)
2169 struct ieee80211_local *local = hw_to_local(hw);
2170 struct sk_buff *skb = NULL;
2171 struct ieee80211_tx_info *info;
2172 struct ieee80211_sub_if_data *sdata = NULL;
2173 struct ieee80211_if_ap *ap = NULL;
2174 struct beacon_data *beacon;
2175 struct ieee80211_supported_band *sband;
2176 enum ieee80211_band band = local->hw.conf.channel->band;
2177 struct ieee80211_tx_rate_control txrc;
2179 sband = local->hw.wiphy->bands[band];
2181 rcu_read_lock();
2183 sdata = vif_to_sdata(vif);
2185 if (!ieee80211_sdata_running(sdata))
2186 goto out;
2188 if (tim_offset)
2189 *tim_offset = 0;
2190 if (tim_length)
2191 *tim_length = 0;
2193 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2194 ap = &sdata->u.ap;
2195 beacon = rcu_dereference(ap->beacon);
2196 if (beacon) {
2198 * headroom, head length,
2199 * tail length and maximum TIM length
2201 skb = dev_alloc_skb(local->tx_headroom +
2202 beacon->head_len +
2203 beacon->tail_len + 256);
2204 if (!skb)
2205 goto out;
2207 skb_reserve(skb, local->tx_headroom);
2208 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2209 beacon->head_len);
2212 * Not very nice, but we want to allow the driver to call
2213 * ieee80211_beacon_get() as a response to the set_tim()
2214 * callback. That, however, is already invoked under the
2215 * sta_lock to guarantee consistent and race-free update
2216 * of the tim bitmap in mac80211 and the driver.
2218 if (local->tim_in_locked_section) {
2219 ieee80211_beacon_add_tim(ap, skb, beacon);
2220 } else {
2221 unsigned long flags;
2223 spin_lock_irqsave(&local->sta_lock, flags);
2224 ieee80211_beacon_add_tim(ap, skb, beacon);
2225 spin_unlock_irqrestore(&local->sta_lock, flags);
2228 if (tim_offset)
2229 *tim_offset = beacon->head_len;
2230 if (tim_length)
2231 *tim_length = skb->len - beacon->head_len;
2233 if (beacon->tail)
2234 memcpy(skb_put(skb, beacon->tail_len),
2235 beacon->tail, beacon->tail_len);
2236 } else
2237 goto out;
2238 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2239 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2240 struct ieee80211_hdr *hdr;
2241 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2243 if (!presp)
2244 goto out;
2246 skb = skb_copy(presp, GFP_ATOMIC);
2247 if (!skb)
2248 goto out;
2250 hdr = (struct ieee80211_hdr *) skb->data;
2251 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2252 IEEE80211_STYPE_BEACON);
2253 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2254 struct ieee80211_mgmt *mgmt;
2255 u8 *pos;
2257 #ifdef CONFIG_MAC80211_MESH
2258 if (!sdata->u.mesh.mesh_id_len)
2259 goto out;
2260 #endif
2262 /* headroom, head length, tail length and maximum TIM length */
2263 skb = dev_alloc_skb(local->tx_headroom + 400 +
2264 sdata->u.mesh.ie_len);
2265 if (!skb)
2266 goto out;
2268 skb_reserve(skb, local->hw.extra_tx_headroom);
2269 mgmt = (struct ieee80211_mgmt *)
2270 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2271 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2272 mgmt->frame_control =
2273 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2274 memset(mgmt->da, 0xff, ETH_ALEN);
2275 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2276 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2277 mgmt->u.beacon.beacon_int =
2278 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2279 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2281 pos = skb_put(skb, 2);
2282 *pos++ = WLAN_EID_SSID;
2283 *pos++ = 0x0;
2285 mesh_mgmt_ies_add(skb, sdata);
2286 } else {
2287 WARN_ON(1);
2288 goto out;
2291 info = IEEE80211_SKB_CB(skb);
2293 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2294 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2295 info->band = band;
2297 memset(&txrc, 0, sizeof(txrc));
2298 txrc.hw = hw;
2299 txrc.sband = sband;
2300 txrc.bss_conf = &sdata->vif.bss_conf;
2301 txrc.skb = skb;
2302 txrc.reported_rate.idx = -1;
2303 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2304 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2305 txrc.max_rate_idx = -1;
2306 else
2307 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2308 txrc.bss = true;
2309 rate_control_get_rate(sdata, NULL, &txrc);
2311 info->control.vif = vif;
2313 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2314 IEEE80211_TX_CTL_ASSIGN_SEQ |
2315 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2316 out:
2317 rcu_read_unlock();
2318 return skb;
2320 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2322 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2323 struct ieee80211_vif *vif)
2325 struct ieee80211_sub_if_data *sdata;
2326 struct ieee80211_if_managed *ifmgd;
2327 struct ieee80211_pspoll *pspoll;
2328 struct ieee80211_local *local;
2329 struct sk_buff *skb;
2331 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2332 return NULL;
2334 sdata = vif_to_sdata(vif);
2335 ifmgd = &sdata->u.mgd;
2336 local = sdata->local;
2338 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2339 if (!skb) {
2340 printk(KERN_DEBUG "%s: failed to allocate buffer for "
2341 "pspoll template\n", sdata->name);
2342 return NULL;
2344 skb_reserve(skb, local->hw.extra_tx_headroom);
2346 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2347 memset(pspoll, 0, sizeof(*pspoll));
2348 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2349 IEEE80211_STYPE_PSPOLL);
2350 pspoll->aid = cpu_to_le16(ifmgd->aid);
2352 /* aid in PS-Poll has its two MSBs each set to 1 */
2353 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2355 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2356 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2358 return skb;
2360 EXPORT_SYMBOL(ieee80211_pspoll_get);
2362 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2363 struct ieee80211_vif *vif)
2365 struct ieee80211_hdr_3addr *nullfunc;
2366 struct ieee80211_sub_if_data *sdata;
2367 struct ieee80211_if_managed *ifmgd;
2368 struct ieee80211_local *local;
2369 struct sk_buff *skb;
2371 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2372 return NULL;
2374 sdata = vif_to_sdata(vif);
2375 ifmgd = &sdata->u.mgd;
2376 local = sdata->local;
2378 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2379 if (!skb) {
2380 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2381 "template\n", sdata->name);
2382 return NULL;
2384 skb_reserve(skb, local->hw.extra_tx_headroom);
2386 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2387 sizeof(*nullfunc));
2388 memset(nullfunc, 0, sizeof(*nullfunc));
2389 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2390 IEEE80211_STYPE_NULLFUNC |
2391 IEEE80211_FCTL_TODS);
2392 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2393 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2394 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2396 return skb;
2398 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2400 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2401 struct ieee80211_vif *vif,
2402 const u8 *ssid, size_t ssid_len,
2403 const u8 *ie, size_t ie_len)
2405 struct ieee80211_sub_if_data *sdata;
2406 struct ieee80211_local *local;
2407 struct ieee80211_hdr_3addr *hdr;
2408 struct sk_buff *skb;
2409 size_t ie_ssid_len;
2410 u8 *pos;
2412 sdata = vif_to_sdata(vif);
2413 local = sdata->local;
2414 ie_ssid_len = 2 + ssid_len;
2416 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2417 ie_ssid_len + ie_len);
2418 if (!skb) {
2419 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
2420 "request template\n", sdata->name);
2421 return NULL;
2424 skb_reserve(skb, local->hw.extra_tx_headroom);
2426 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2427 memset(hdr, 0, sizeof(*hdr));
2428 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2429 IEEE80211_STYPE_PROBE_REQ);
2430 memset(hdr->addr1, 0xff, ETH_ALEN);
2431 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2432 memset(hdr->addr3, 0xff, ETH_ALEN);
2434 pos = skb_put(skb, ie_ssid_len);
2435 *pos++ = WLAN_EID_SSID;
2436 *pos++ = ssid_len;
2437 if (ssid)
2438 memcpy(pos, ssid, ssid_len);
2439 pos += ssid_len;
2441 if (ie) {
2442 pos = skb_put(skb, ie_len);
2443 memcpy(pos, ie, ie_len);
2446 return skb;
2448 EXPORT_SYMBOL(ieee80211_probereq_get);
2450 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2451 const void *frame, size_t frame_len,
2452 const struct ieee80211_tx_info *frame_txctl,
2453 struct ieee80211_rts *rts)
2455 const struct ieee80211_hdr *hdr = frame;
2457 rts->frame_control =
2458 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2459 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2460 frame_txctl);
2461 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2462 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2464 EXPORT_SYMBOL(ieee80211_rts_get);
2466 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2467 const void *frame, size_t frame_len,
2468 const struct ieee80211_tx_info *frame_txctl,
2469 struct ieee80211_cts *cts)
2471 const struct ieee80211_hdr *hdr = frame;
2473 cts->frame_control =
2474 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2475 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2476 frame_len, frame_txctl);
2477 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2479 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2481 struct sk_buff *
2482 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2483 struct ieee80211_vif *vif)
2485 struct ieee80211_local *local = hw_to_local(hw);
2486 struct sk_buff *skb = NULL;
2487 struct ieee80211_tx_data tx;
2488 struct ieee80211_sub_if_data *sdata;
2489 struct ieee80211_if_ap *bss = NULL;
2490 struct beacon_data *beacon;
2491 struct ieee80211_tx_info *info;
2493 sdata = vif_to_sdata(vif);
2494 bss = &sdata->u.ap;
2496 rcu_read_lock();
2497 beacon = rcu_dereference(bss->beacon);
2499 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2500 goto out;
2502 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2503 goto out; /* send buffered bc/mc only after DTIM beacon */
2505 while (1) {
2506 skb = skb_dequeue(&bss->ps_bc_buf);
2507 if (!skb)
2508 goto out;
2509 local->total_ps_buffered--;
2511 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2512 struct ieee80211_hdr *hdr =
2513 (struct ieee80211_hdr *) skb->data;
2514 /* more buffered multicast/broadcast frames ==> set
2515 * MoreData flag in IEEE 802.11 header to inform PS
2516 * STAs */
2517 hdr->frame_control |=
2518 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2521 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2522 break;
2523 dev_kfree_skb_any(skb);
2526 info = IEEE80211_SKB_CB(skb);
2528 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2529 tx.channel = local->hw.conf.channel;
2530 info->band = tx.channel->band;
2532 if (invoke_tx_handlers(&tx))
2533 skb = NULL;
2534 out:
2535 rcu_read_unlock();
2537 return skb;
2539 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2541 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2543 skb_set_mac_header(skb, 0);
2544 skb_set_network_header(skb, 0);
2545 skb_set_transport_header(skb, 0);
2547 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2548 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
2549 skb->priority = 7;
2552 * The other path calling ieee80211_xmit is from the tasklet,
2553 * and while we can handle concurrent transmissions locking
2554 * requirements are that we do not come into tx with bhs on.
2556 local_bh_disable();
2557 ieee80211_xmit(sdata, skb);
2558 local_bh_enable();