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nl80211: add support for mcs masks
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 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>
6 *
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.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
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>
d4e46a3d 20#include <linux/rcupdate.h>
bc3b2d7f 21#include <linux/export.h>
881d966b 22#include <net/net_namespace.h>
e2ebc74d
JB		 23#include <net/ieee80211_radiotap.h>
24#include <net/cfg80211.h>
25#include <net/mac80211.h>
26#include <asm/unaligned.h>
27
28#include "ieee80211_i.h"
24487981 29#include "driver-ops.h"
2c8dccc7 30#include "led.h"
33b64eb2 31#include "mesh.h"
e2ebc74d
JB		 32#include "wep.h"
33#include "wpa.h"
34#include "wme.h"
2c8dccc7 35#include "rate.h"
e2ebc74d 36
e2ebc74d
JB		 37/* misc utils */
38
252b86c4
JB		 39static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
03f93c3d 41 int next_frag_len)
e2ebc74d
JB		 42{
43 int rate, mrate, erp, dur, i;
2e92e6f2 44 struct ieee80211_rate *txrate;
e2ebc74d 45 struct ieee80211_local *local = tx->local;
8318d78a 46 struct ieee80211_supported_band *sband;
358c8d9d 47 struct ieee80211_hdr *hdr;
252b86c4 48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e6a9854b
JB		 49
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
52 return 0;
53
54 /* uh huh? */
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
56 return 0;
e2ebc74d 57
2e92e6f2 58 sband = local->hw.wiphy->bands[tx->channel->band];
e6a9854b 59 txrate = &sband->bitrates[info->control.rates[0].idx];
8318d78a 60
e6a9854b 61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 62
63 /*
64 * data and mgmt (except PS Poll):
65 * - during CFP: 32768
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
72 *
73 * IEEE 802.11, 9.6:
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
78 * BSSBasicRateSet
79 */
252b86c4 80 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 81 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 82 /* TODO: These control frames are not currently sent by
ccd7b362 83 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 84 * needs to be updated to support duration field calculation.
85 *
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
93 * and its SIFS
94 * PS Poll: BIT(15) | BIT(14) | aid
95 */
96 return 0;
97 }
98
99 /* data/mgmt */
100 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 101 return cpu_to_le16(32768);
e2ebc74d
JB		 102
103 if (group_addr) /* Group address as the destination - no ACK */
104 return 0;
105
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
115 */
116 rate = -1;
8318d78a
JB		 117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 121
8318d78a
JB		 122 if (r->bitrate > txrate->bitrate)
123 break;
e2ebc74d 124
bda3933a 125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
8318d78a
JB		 126 rate = r->bitrate;
127
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
130 u32 flag;
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
133 else
134 flag = IEEE80211_RATE_MANDATORY_B;
135 if (r->flags & flag)
136 mrate = r->bitrate;
137 break;
138 }
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
141 mrate = r->bitrate;
142 break;
143 case IEEE80211_NUM_BANDS:
144 WARN_ON(1);
145 break;
146 }
e2ebc74d
JB		 147 }
148 if (rate == -1) {
149 /* No matching basic rate found; use highest suitable mandatory
150 * PHY rate */
151 rate = mrate;
152 }
153
6674f210
SW		 154 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
155 if (ieee80211_is_data_qos(hdr->frame_control) &&
156 *(ieee80211_get_qos_ctl(hdr)) | IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
157 dur = 0;
158 else
159 /* Time needed to transmit ACK
160 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
161 * to closest integer */
162 dur = ieee80211_frame_duration(local, 10, rate, erp,
bda3933a 163 tx->sdata->vif.bss_conf.use_short_preamble);
e2ebc74d
JB		 164
165 if (next_frag_len) {
166 /* Frame is fragmented: duration increases with time needed to
167 * transmit next fragment plus ACK and 2 x SIFS. */
168 dur *= 2; /* ACK + SIFS */
169 /* next fragment */
170 dur += ieee80211_frame_duration(local, next_frag_len,
8318d78a 171 txrate->bitrate, erp,
bda3933a 172 tx->sdata->vif.bss_conf.use_short_preamble);
e2ebc74d
JB		 173 }
174
03f93c3d 175 return cpu_to_le16(dur);
e2ebc74d
JB		 176}
177
42b16b3f 178static inline int is_ieee80211_device(struct ieee80211_local *local,
133b8226 179 struct net_device *dev)
e2ebc74d 180{
133b8226 181 return local == wdev_priv(dev->ieee80211_ptr);
e2ebc74d
JB		 182}
183
184/* tx handlers */
5c1b98a5
KV		 185static ieee80211_tx_result debug_noinline
186ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
187{
188 struct ieee80211_local *local = tx->local;
0c74211d 189 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 190
191 /* driver doesn't support power save */
192 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
193 return TX_CONTINUE;
194
195 /* hardware does dynamic power save */
196 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
197 return TX_CONTINUE;
198
199 /* dynamic power save disabled */
200 if (local->hw.conf.dynamic_ps_timeout <= 0)
201 return TX_CONTINUE;
202
203 /* we are scanning, don't enable power save */
204 if (local->scanning)
205 return TX_CONTINUE;
206
207 if (!local->ps_sdata)
208 return TX_CONTINUE;
209
210 /* No point if we're going to suspend */
211 if (local->quiescing)
212 return TX_CONTINUE;
213
0c74211d
KV		 214 /* dynamic ps is supported only in managed mode */
215 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
216 return TX_CONTINUE;
217
218 ifmgd = &tx->sdata->u.mgd;
219
220 /*
221 * Don't wakeup from power save if u-apsd is enabled, voip ac has
222 * u-apsd enabled and the frame is in voip class. This effectively
223 * means that even if all access categories have u-apsd enabled, in
224 * practise u-apsd is only used with the voip ac. This is a
225 * workaround for the case when received voip class packets do not
226 * have correct qos tag for some reason, due the network or the
227 * peer application.
228 *
229 * Note: local->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
232 */
233 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
234 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
235 && skb_get_queue_mapping(tx->skb) == 0)
236 return TX_CONTINUE;
237
5c1b98a5
KV		 238 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
239 ieee80211_stop_queues_by_reason(&local->hw,
240 IEEE80211_QUEUE_STOP_REASON_PS);
db28569a 241 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 242 ieee80211_queue_work(&local->hw,
243 &local->dynamic_ps_disable_work);
244 }
245
5db1c07c
LC		 246 /* Don't restart the timer if we're not disassociated */
247 if (!ifmgd->associated)
248 return TX_CONTINUE;
249
5c1b98a5
KV		 250 mod_timer(&local->dynamic_ps_timer, jiffies +
251 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
252
253 return TX_CONTINUE;
254}
e2ebc74d 255
d9e8a70f 256static ieee80211_tx_result debug_noinline
5cf121c3 257ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 258{
358c8d9d 259
e039fa4a 260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 262 bool assoc = false;
e2ebc74d 263
e039fa4a 264 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 265 return TX_CONTINUE;
58d4185e 266
b23b025f
BG		 267 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
268 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 269 !ieee80211_is_probe_req(hdr->frame_control) &&
270 !ieee80211_is_nullfunc(hdr->frame_control))
271 /*
272 * When software scanning only nullfunc frames (to notify
273 * the sleep state to the AP) and probe requests (for the
274 * active scan) are allowed, all other frames should not be
275 * sent and we should not get here, but if we do
276 * nonetheless, drop them to avoid sending them
277 * off-channel. See the link below and
278 * ieee80211_start_scan() for more.
279 *
280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
281 */
9ae54c84 282 return TX_DROP;
e2ebc74d 283
1be7fe8d
BJ		 284 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
285 return TX_CONTINUE;
286
05c914fe 287 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
33b64eb2
LCC		 288 return TX_CONTINUE;
289
5cf121c3 290 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 291 return TX_CONTINUE;
e2ebc74d 292
c2c98fde
JB		 293 if (tx->sta)
294 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 295
5cf121c3 296 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 297 if (unlikely(!assoc &&
358c8d9d 298 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d
JB		 299#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
300 printk(KERN_DEBUG "%s: dropped data frame to not "
0c68ae26 301 "associated station %pM\n",
47846c9b 302 tx->sdata->name, hdr->addr1);
e2ebc74d
JB		 303#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
304 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 305 return TX_DROP;
e2ebc74d 306 }
29623892
JB		 307 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
308 ieee80211_is_data(hdr->frame_control) &&
309 !atomic_read(&tx->sdata->u.ap.num_sta_authorized))) {
310 /*
311 * No associated STAs - no need to send multicast
312 * frames.
313 */
314 return TX_DROP;
e2ebc74d
JB		 315 }
316
9ae54c84 317 return TX_CONTINUE;
e2ebc74d
JB		 318}
319
e2ebc74d
JB		 320/* This function is called whenever the AP is about to exceed the maximum limit
321 * of buffered frames for power saving STAs. This situation should not really
322 * happen often during normal operation, so dropping the oldest buffered packet
323 * from each queue should be OK to make some room for new frames. */
324static void purge_old_ps_buffers(struct ieee80211_local *local)
325{
326 int total = 0, purged = 0;
327 struct sk_buff *skb;
328 struct ieee80211_sub_if_data *sdata;
329 struct sta_info *sta;
330
79010420
JB		 331 /*
332 * virtual interfaces are protected by RCU
333 */
334 rcu_read_lock();
335
336 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
e2ebc74d 337 struct ieee80211_if_ap *ap;
05c914fe 338 if (sdata->vif.type != NL80211_IFTYPE_AP)
e2ebc74d
JB		 339 continue;
340 ap = &sdata->u.ap;
341 skb = skb_dequeue(&ap->ps_bc_buf);
342 if (skb) {
343 purged++;
344 dev_kfree_skb(skb);
345 }
346 total += skb_queue_len(&ap->ps_bc_buf);
347 }
e2ebc74d 348
948d887d
JB		 349 /*
350 * Drop one frame from each station from the lowest-priority
351 * AC that has frames at all.
352 */
d0709a65 353 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 354 int ac;
355
356 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
357 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
358 total += skb_queue_len(&sta->ps_tx_buf[ac]);
359 if (skb) {
360 purged++;
361 dev_kfree_skb(skb);
362 break;
363 }
e2ebc74d 364 }
e2ebc74d 365 }
d0709a65
JB		 366
367 rcu_read_unlock();
e2ebc74d
JB		 368
369 local->total_ps_buffered = total;
54223995 370#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0fb9a9ec
JP		 371 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
372 purged);
f4ea83dd 373#endif
e2ebc74d
JB		 374}
375
9ae54c84 376static ieee80211_tx_result
5cf121c3 377ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 378{
e039fa4a 379 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 381
7d54d0dd
JB		 382 /*
383 * broadcast/multicast frame
384 *
385 * If any of the associated stations is in power save mode,
386 * the frame is buffered to be sent after DTIM beacon frame.
387 * This is done either by the hardware or us.
388 */
389
3e122be0
JB		 390 /* powersaving STAs only in AP/VLAN mode */
391 if (!tx->sdata->bss)
392 return TX_CONTINUE;
393
394 /* no buffering for ordered frames */
358c8d9d 395 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 396 return TX_CONTINUE;
7d54d0dd
JB		 397
398 /* no stations in PS mode */
399 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
9ae54c84 400 return TX_CONTINUE;
7d54d0dd 401
62b517cb 402 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
62b1208e 403
62b517cb
JB		 404 /* device releases frame after DTIM beacon */
405 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
62b1208e 406 return TX_CONTINUE;
62b1208e 407
7d54d0dd 408 /* buffered in mac80211 */
62b1208e
JB		 409 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
410 purge_old_ps_buffers(tx->local);
411
412 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
54223995 413#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
62b1208e
JB		 414 if (net_ratelimit())
415 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
47846c9b 416 tx->sdata->name);
f4ea83dd 417#endif
62b1208e
JB		 418 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
419 } else
420 tx->local->total_ps_buffered++;
e2ebc74d 421
62b1208e 422 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
7d54d0dd 423
62b1208e 424 return TX_QUEUED;
e2ebc74d
JB		 425}
426
fb733336
JM		 427static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
428 struct sk_buff *skb)
429{
430 if (!ieee80211_is_mgmt(fc))
431 return 0;
432
c2c98fde 433 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 434 return 0;
435
436 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
437 skb->data))
438 return 0;
439
440 return 1;
441}
442
9ae54c84 443static ieee80211_tx_result
5cf121c3 444ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 445{
446 struct sta_info *sta = tx->sta;
e039fa4a 447 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 449 struct ieee80211_local *local = tx->local;
e2ebc74d 450
f64f9e71
JP		 451 if (unlikely(!sta ||
452 ieee80211_is_probe_resp(hdr->frame_control) ||
453 ieee80211_is_auth(hdr->frame_control) ||
454 ieee80211_is_assoc_resp(hdr->frame_control) ||
455 ieee80211_is_reassoc_resp(hdr->frame_control)))
9ae54c84 456 return TX_CONTINUE;
e2ebc74d 457
c2c98fde
JB		 458 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
459 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
47086fc5 460 !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) {
948d887d
JB		 461 int ac = skb_get_queue_mapping(tx->skb);
462
e2ebc74d 463#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
948d887d
JB		 464 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
465 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d 466#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e2ebc74d
JB		 467 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
468 purge_old_ps_buffers(tx->local);
948d887d
JB		 469 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
470 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
54223995 471#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
948d887d
JB		 472 if (net_ratelimit())
473 printk(KERN_DEBUG "%s: STA %pM TX buffer for "
474 "AC %d full - dropping oldest frame\n",
475 tx->sdata->name, sta->sta.addr, ac);
f4ea83dd 476#endif
e2ebc74d
JB		 477 dev_kfree_skb(old);
478 } else
479 tx->local->total_ps_buffered++;
004c872e 480
e039fa4a 481 info->control.jiffies = jiffies;
5061b0c2 482 info->control.vif = &tx->sdata->vif;
8f77f384 483 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
948d887d 484 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
3393a608
JO		 485
486 if (!timer_pending(&local->sta_cleanup))
487 mod_timer(&local->sta_cleanup,
488 round_jiffies(jiffies +
489 STA_INFO_CLEANUP_INTERVAL));
490
c868cb35
JB		 491 /*
492 * We queued up some frames, so the TIM bit might
493 * need to be set, recalculate it.
494 */
495 sta_info_recalc_tim(sta);
496
9ae54c84 497 return TX_QUEUED;
e2ebc74d
JB		 498 }
499#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
c2c98fde 500 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
47086fc5
JB		 501 printk(KERN_DEBUG
502 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
503 tx->sdata->name, sta->sta.addr);
e2ebc74d
JB		 504 }
505#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e2ebc74d 506
9ae54c84 507 return TX_CONTINUE;
e2ebc74d
JB		 508}
509
d9e8a70f 510static ieee80211_tx_result debug_noinline
5cf121c3 511ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 512{
5cf121c3 513 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 514 return TX_CONTINUE;
e2ebc74d 515
5cf121c3 516 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 517 return ieee80211_tx_h_unicast_ps_buf(tx);
518 else
519 return ieee80211_tx_h_multicast_ps_buf(tx);
520}
521
a621fa4d
JB		 522static ieee80211_tx_result debug_noinline
523ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
524{
525 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
526
527 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
528 tx->sdata->control_port_no_encrypt))
529 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
530
531 return TX_CONTINUE;
532}
533
d9e8a70f 534static ieee80211_tx_result debug_noinline
5cf121c3 535ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 536{
d3feaf5a 537 struct ieee80211_key *key = NULL;
e039fa4a 538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 539 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 540
3b8d81e0 541 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 542 tx->key = NULL;
e31b8213 543 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
d4e46a3d 544 tx->key = key;
3cfcf6ac 545 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324
JM		 546 is_multicast_ether_addr(hdr->addr1) &&
547 ieee80211_is_robust_mgmt_frame(hdr) &&
3cfcf6ac
JM		 548 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
549 tx->key = key;
f7e0104c
JB		 550 else if (is_multicast_ether_addr(hdr->addr1) &&
551 (key = rcu_dereference(tx->sdata->default_multicast_key)))
552 tx->key = key;
553 else if (!is_multicast_ether_addr(hdr->addr1) &&
554 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 555 tx->key = key;
e2ebc74d 556 else if (tx->sdata->drop_unencrypted &&
a621fa4d 557 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
e0463f50
JM		 558 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
559 (!ieee80211_is_robust_mgmt_frame(hdr) ||
560 (ieee80211_is_action(hdr->frame_control) &&
c2c98fde 561 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
e2ebc74d 562 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
9ae54c84 563 return TX_DROP;
176e4f84 564 } else
e2ebc74d
JB		 565 tx->key = NULL;
566
567 if (tx->key) {
813d7669
JB		 568 bool skip_hw = false;
569
e2ebc74d 570 tx->key->tx_rx_count++;
011bfcc4 571 /* TODO: add threshold stuff again */
176e4f84 572
97359d12
JB		 573 switch (tx->key->conf.cipher) {
574 case WLAN_CIPHER_SUITE_WEP40:
575 case WLAN_CIPHER_SUITE_WEP104:
97359d12 576 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 577 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 578 tx->key = NULL;
579 break;
97359d12 580 case WLAN_CIPHER_SUITE_CCMP:
fb733336
JM		 581 if (!ieee80211_is_data_present(hdr->frame_control) &&
582 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
583 tx->skb))
584 tx->key = NULL;
3b43a187
KV		 585 else
586 skip_hw = (tx->key->conf.flags &
587 IEEE80211_KEY_FLAG_SW_MGMT) &&
588 ieee80211_is_mgmt(hdr->frame_control);
fb733336 589 break;
97359d12 590 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 591 if (!ieee80211_is_mgmt(hdr->frame_control))
592 tx->key = NULL;
593 break;
176e4f84 594 }
813d7669 595
95acac61
JB		 596 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
597 return TX_DROP;
598
f12553eb 599 if (!skip_hw && tx->key &&
382b1655 600 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 601 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 602 }
603
9ae54c84 604 return TX_CONTINUE;
e2ebc74d
JB		 605}
606
d9e8a70f 607static ieee80211_tx_result debug_noinline
5cf121c3 608ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 609{
e039fa4a 610 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 611 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
612 struct ieee80211_supported_band *sband;
613 struct ieee80211_rate *rate;
a2c40249
SZ		 614 int i;
615 u32 len;
e6a9854b
JB		 616 bool inval = false, rts = false, short_preamble = false;
617 struct ieee80211_tx_rate_control txrc;
c2c98fde 618 bool assoc = false;
8318d78a 619
e6a9854b 620 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 621
e6a9854b 622 sband = tx->local->hw.wiphy->bands[tx->channel->band];
58d4185e 623
a2c40249 624 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 625 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 626
627 /* set up the tx rate control struct we give the RC algo */
628 txrc.hw = local_to_hw(tx->local);
629 txrc.sband = sband;
630 txrc.bss_conf = &tx->sdata->vif.bss_conf;
631 txrc.skb = tx->skb;
632 txrc.reported_rate.idx = -1;
37eb0b16
JM		 633 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
634 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
635 txrc.max_rate_idx = -1;
636 else
637 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 638 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 639 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
8f0729b1 640 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
e6a9854b
JB		 641
642 /* set up RTS protection if desired */
b9a5f8ca 643 if (len > tx->local->hw.wiphy->rts_threshold) {
e6a9854b 644 txrc.rts = rts = true;
e2ebc74d 645 }
e2ebc74d 646
e6a9854b
JB		 647 /*
648 * Use short preamble if the BSS can handle it, but not for
649 * management frames unless we know the receiver can handle
650 * that -- the management frame might be to a station that
651 * just wants a probe response.
652 */
653 if (tx->sdata->vif.bss_conf.use_short_preamble &&
654 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 655 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
e6a9854b 656 txrc.short_preamble = short_preamble = true;
e2ebc74d 657
c2c98fde
JB		 658 if (tx->sta)
659 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 660
661 /*
662 * Lets not bother rate control if we're associated and cannot
663 * talk to the sta. This should not happen.
664 */
c2c98fde 665 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 666 !rate_usable_index_exists(sband, &tx->sta->sta),
667 "%s: Dropped data frame as no usable bitrate found while "
668 "scanning and associated. Target station: "
669 "%pM on %d GHz band\n",
47846c9b 670 tx->sdata->name, hdr->addr1,
b770b43e
LR		 671 tx->channel->band ? 5 : 2))
672 return TX_DROP;
2e92e6f2 673
b770b43e
LR		 674 /*
675 * If we're associated with the sta at this point we know we can at
676 * least send the frame at the lowest bit rate.
677 */
e6a9854b
JB		 678 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
679
680 if (unlikely(info->control.rates[0].idx < 0))
681 return TX_DROP;
682
c1ce5a74 683 if (txrc.reported_rate.idx < 0) {
e6a9854b 684 txrc.reported_rate = info->control.rates[0];
c1ce5a74
HS		 685 if (tx->sta && ieee80211_is_data(hdr->frame_control))
686 tx->sta->last_tx_rate = txrc.reported_rate;
687 } else if (tx->sta)
e6a9854b 688 tx->sta->last_tx_rate = txrc.reported_rate;
e039fa4a 689
e6a9854b
JB		 690 if (unlikely(!info->control.rates[0].count))
691 info->control.rates[0].count = 1;
e2ebc74d 692
9955151d
GS		 693 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
694 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
695 info->control.rates[0].count = 1;
696
e6a9854b
JB		 697 if (is_multicast_ether_addr(hdr->addr1)) {
698 /*
699 * XXX: verify the rate is in the basic rateset
700 */
701 return TX_CONTINUE;
e2ebc74d
JB		 702 }
703
e6a9854b
JB		 704 /*
705 * set up the RTS/CTS rate as the fastest basic rate
706 * that is not faster than the data rate
707 *
708 * XXX: Should this check all retry rates?
709 */
710 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
711 s8 baserate = 0;
712
713 rate = &sband->bitrates[info->control.rates[0].idx];
714
715 for (i = 0; i < sband->n_bitrates; i++) {
716 /* must be a basic rate */
717 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
718 continue;
719 /* must not be faster than the data rate */
720 if (sband->bitrates[i].bitrate > rate->bitrate)
721 continue;
722 /* maximum */
723 if (sband->bitrates[baserate].bitrate <
724 sband->bitrates[i].bitrate)
725 baserate = i;
726 }
727
728 info->control.rts_cts_rate_idx = baserate;
7e9ed188
DD		 729 }
730
e6a9854b
JB		 731 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
732 /*
733 * make sure there's no valid rate following
734 * an invalid one, just in case drivers don't
735 * take the API seriously to stop at -1.
736 */
737 if (inval) {
738 info->control.rates[i].idx = -1;
739 continue;
740 }
741 if (info->control.rates[i].idx < 0) {
742 inval = true;
743 continue;
744 }
8318d78a 745
e6a9854b
JB		 746 /*
747 * For now assume MCS is already set up correctly, this
748 * needs to be fixed.
749 */
750 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
751 WARN_ON(info->control.rates[i].idx > 76);
752 continue;
753 }
e2ebc74d 754
e6a9854b
JB		 755 /* set up RTS protection if desired */
756 if (rts)
757 info->control.rates[i].flags |=
758 IEEE80211_TX_RC_USE_RTS_CTS;
8318d78a 759
e6a9854b 760 /* RC is busted */
075cbc9e
S		 761 if (WARN_ON_ONCE(info->control.rates[i].idx >=
762 sband->n_bitrates)) {
e6a9854b
JB		 763 info->control.rates[i].idx = -1;
764 continue;
8318d78a 765 }
e2ebc74d 766
e6a9854b
JB		 767 rate = &sband->bitrates[info->control.rates[i].idx];
768
769 /* set up short preamble */
770 if (short_preamble &&
771 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
772 info->control.rates[i].flags |=
773 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
774
775 /* set up G protection */
776 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
777 rate->flags & IEEE80211_RATE_ERP_G)
778 info->control.rates[i].flags |=
779 IEEE80211_TX_RC_USE_CTS_PROTECT;
e2ebc74d
JB		 780 }
781
e6a9854b
JB		 782 return TX_CONTINUE;
783}
784
f591fa5d
JB		 785static ieee80211_tx_result debug_noinline
786ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
787{
788 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
789 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
790 u16 *seq;
791 u8 *qc;
792 int tid;
793
25d834e1
JB		 794 /*
795 * Packet injection may want to control the sequence
796 * number, if we have no matching interface then we
797 * neither assign one ourselves nor ask the driver to.
798 */
5061b0c2 799 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 800 return TX_CONTINUE;
801
f591fa5d
JB		 802 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
803 return TX_CONTINUE;
804
805 if (ieee80211_hdrlen(hdr->frame_control) < 24)
806 return TX_CONTINUE;
807
49a59543
JB		 808 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
809 return TX_CONTINUE;
810
94778280
JB		 811 /*
812 * Anything but QoS data that has a sequence number field
813 * (is long enough) gets a sequence number from the global
814 * counter.
815 */
f591fa5d 816 if (!ieee80211_is_data_qos(hdr->frame_control)) {
94778280 817 /* driver should assign sequence number */
f591fa5d 818 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 819 /* for pure STA mode without beacons, we can do it */
820 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
821 tx->sdata->sequence_number += 0x10;
f591fa5d
JB		 822 return TX_CONTINUE;
823 }
824
825 /*
826 * This should be true for injected/management frames only, for
827 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
828 * above since they are not QoS-data frames.
829 */
830 if (!tx->sta)
831 return TX_CONTINUE;
832
833 /* include per-STA, per-TID sequence counter */
834
835 qc = ieee80211_get_qos_ctl(hdr);
836 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
837 seq = &tx->sta->tid_seq[tid];
838
839 hdr->seq_ctrl = cpu_to_le16(*seq);
840
841 /* Increase the sequence number. */
842 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
843
844 return TX_CONTINUE;
845}
846
252b86c4 847static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 848 struct sk_buff *skb, int hdrlen,
849 int frag_threshold)
850{
252b86c4 851 struct ieee80211_local *local = tx->local;
a1a3fcec 852 struct ieee80211_tx_info *info;
252b86c4 853 struct sk_buff *tmp;
2de8e0d9
JB		 854 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
855 int pos = hdrlen + per_fragm;
856 int rem = skb->len - hdrlen - per_fragm;
857
858 if (WARN_ON(rem < 0))
859 return -EINVAL;
860
252b86c4
JB		 861 /* first fragment was already added to queue by caller */
862
2de8e0d9
JB		 863 while (rem) {
864 int fraglen = per_fragm;
865
866 if (fraglen > rem)
867 fraglen = rem;
868 rem -= fraglen;
869 tmp = dev_alloc_skb(local->tx_headroom +
870 frag_threshold +
871 IEEE80211_ENCRYPT_HEADROOM +
872 IEEE80211_ENCRYPT_TAILROOM);
873 if (!tmp)
874 return -ENOMEM;
252b86c4
JB		 875
876 __skb_queue_tail(&tx->skbs, tmp);
877
2de8e0d9
JB		 878 skb_reserve(tmp, local->tx_headroom +
879 IEEE80211_ENCRYPT_HEADROOM);
880 /* copy control information */
881 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 882
883 info = IEEE80211_SKB_CB(tmp);
884 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
885 IEEE80211_TX_CTL_FIRST_FRAGMENT);
886
887 if (rem)
888 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
889
2de8e0d9
JB		 890 skb_copy_queue_mapping(tmp, skb);
891 tmp->priority = skb->priority;
2de8e0d9 892 tmp->dev = skb->dev;
2de8e0d9
JB		 893
894 /* copy header and data */
895 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
896 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
897
898 pos += fraglen;
899 }
900
252b86c4 901 /* adjust first fragment's length */
2de8e0d9
JB		 902 skb->len = hdrlen + per_fragm;
903 return 0;
904}
905
d9e8a70f 906static ieee80211_tx_result debug_noinline
e2454948
JB		 907ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
908{
2de8e0d9
JB		 909 struct sk_buff *skb = tx->skb;
910 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
911 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 912 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 913 int hdrlen;
914 int fragnum;
e2454948 915
252b86c4
JB		 916 /* no matter what happens, tx->skb moves to tx->skbs */
917 __skb_queue_tail(&tx->skbs, skb);
918 tx->skb = NULL;
919
a26eb27a
JB		 920 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
921 return TX_CONTINUE;
922
923 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 924 return TX_CONTINUE;
925
eefce91a
JB		 926 /*
927 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 928 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 929 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 930 */
8b30b1fe 931 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 932 return TX_DROP;
933
065e9605 934 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 935
a26eb27a 936 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 937 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 938 return TX_DROP;
e6a9854b 939
2de8e0d9
JB		 940 /*
941 * Now fragment the frame. This will allocate all the fragments and
942 * chain them (using skb as the first fragment) to skb->next.
943 * During transmission, we will remove the successfully transmitted
944 * fragments from this list. When the low-level driver rejects one
945 * of the fragments then we will simply pretend to accept the skb
946 * but store it away as pending.
947 */
252b86c4 948 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 949 return TX_DROP;
e6a9854b 950
2de8e0d9
JB		 951 /* update duration/seq/flags of fragments */
952 fragnum = 0;
252b86c4
JB		 953
954 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9
JB		 955 int next_len;
956 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 957
2de8e0d9
JB		 958 hdr = (void *)skb->data;
959 info = IEEE80211_SKB_CB(skb);
e6a9854b 960
252b86c4 961 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 962 hdr->frame_control |= morefrags;
e6a9854b
JB		 963 /*
964 * No multi-rate retries for fragmented frames, that
965 * would completely throw off the NAV at other STAs.
966 */
967 info->control.rates[1].idx = -1;
968 info->control.rates[2].idx = -1;
969 info->control.rates[3].idx = -1;
970 info->control.rates[4].idx = -1;
971 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
972 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 973 } else {
974 hdr->frame_control &= ~morefrags;
975 next_len = 0;
e6a9854b 976 }
2de8e0d9
JB		 977 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
978 fragnum++;
252b86c4 979 }
e2ebc74d 980
9ae54c84 981 return TX_CONTINUE;
e2ebc74d
JB		 982}
983
feff1f2f
JB		 984static ieee80211_tx_result debug_noinline
985ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
986{
252b86c4 987 struct sk_buff *skb;
feff1f2f
JB		 988
989 if (!tx->sta)
990 return TX_CONTINUE;
991
992 tx->sta->tx_packets++;
252b86c4 993 skb_queue_walk(&tx->skbs, skb) {
feff1f2f
JB		 994 tx->sta->tx_fragments++;
995 tx->sta->tx_bytes += skb->len;
252b86c4 996 }
feff1f2f
JB		 997
998 return TX_CONTINUE;
999}
1000
d9e8a70f 1001static ieee80211_tx_result debug_noinline
e2454948
JB		 1002ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1003{
1004 if (!tx->key)
1005 return TX_CONTINUE;
1006
97359d12
JB		 1007 switch (tx->key->conf.cipher) {
1008 case WLAN_CIPHER_SUITE_WEP40:
1009 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1010 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1011 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1012 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1013 case WLAN_CIPHER_SUITE_CCMP:
e2454948 1014 return ieee80211_crypto_ccmp_encrypt(tx);
97359d12 1015 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1016 return ieee80211_crypto_aes_cmac_encrypt(tx);
3ffc2a90 1017 default:
d32a1028 1018 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1019 }
1020
e2454948
JB		 1021 return TX_DROP;
1022}
1023
d9e8a70f 1024static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1025ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1026{
252b86c4 1027 struct sk_buff *skb;
2de8e0d9
JB		 1028 struct ieee80211_hdr *hdr;
1029 int next_len;
1030 bool group_addr;
03f93c3d 1031
252b86c4 1032 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1033 hdr = (void *) skb->data;
7e0aae47
JM		 1034 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1035 break; /* must not overwrite AID */
252b86c4
JB		 1036 if (!skb_queue_is_last(&tx->skbs, skb)) {
1037 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1038 next_len = next->len;
1039 } else
1040 next_len = 0;
2de8e0d9 1041 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1042
2de8e0d9 1043 hdr->duration_id =
252b86c4
JB		 1044 ieee80211_duration(tx, skb, group_addr, next_len);
1045 }
03f93c3d
JB		 1046
1047 return TX_CONTINUE;
1048}
1049
e2ebc74d
JB		 1050/* actual transmit path */
1051
a622ab72
JB		 1052static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1053 struct sk_buff *skb,
1054 struct ieee80211_tx_info *info,
1055 struct tid_ampdu_tx *tid_tx,
1056 int tid)
1057{
1058 bool queued = false;
285fa695 1059 bool reset_agg_timer = false;
a622ab72
JB		 1060
1061 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1062 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1063 reset_agg_timer = true;
0ab33703
JB		 1064 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1065 /*
1066 * nothing -- this aggregation session is being started
1067 * but that might still fail with the driver
1068 */
a622ab72
JB		 1069 } else {
1070 spin_lock(&tx->sta->lock);
1071 /*
1072 * Need to re-check now, because we may get here
1073 *
1074 * 1) in the window during which the setup is actually
1075 * already done, but not marked yet because not all
1076 * packets are spliced over to the driver pending
1077 * queue yet -- if this happened we acquire the lock
1078 * either before or after the splice happens, but
1079 * need to recheck which of these cases happened.
1080 *
1081 * 2) during session teardown, if the OPERATIONAL bit
1082 * was cleared due to the teardown but the pointer
1083 * hasn't been assigned NULL yet (or we loaded it
1084 * before it was assigned) -- in this case it may
1085 * now be NULL which means we should just let the
1086 * packet pass through because splicing the frames
1087 * back is already done.
1088 */
40b275b6 1089 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1090
1091 if (!tid_tx) {
1092 /* do nothing, let packet pass through */
1093 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1094 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1095 reset_agg_timer = true;
a622ab72
JB		 1096 } else {
1097 queued = true;
1098 info->control.vif = &tx->sdata->vif;
1099 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1100 __skb_queue_tail(&tid_tx->pending, skb);
1101 }
1102 spin_unlock(&tx->sta->lock);
1103 }
1104
285fa695
NM		 1105 /* reset session timer */
1106 if (reset_agg_timer && tid_tx->timeout)
1107 mod_timer(&tid_tx->session_timer,
1108 TU_TO_EXP_TIME(tid_tx->timeout));
1109
a622ab72
JB		 1110 return queued;
1111}
1112
58d4185e
JB		 1113/*
1114 * initialises @tx
1115 */
9ae54c84 1116static ieee80211_tx_result
3b8d81e0
JB		 1117ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1118 struct ieee80211_tx_data *tx,
1119 struct sk_buff *skb)
e2ebc74d 1120{
3b8d81e0 1121 struct ieee80211_local *local = sdata->local;
58d4185e 1122 struct ieee80211_hdr *hdr;
e039fa4a 1123 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1124 int tid;
a622ab72 1125 u8 *qc;
e2ebc74d
JB		 1126
1127 memset(tx, 0, sizeof(*tx));
1128 tx->skb = skb;
e2ebc74d 1129 tx->local = local;
3b8d81e0 1130 tx->sdata = sdata;
e039fa4a 1131 tx->channel = local->hw.conf.channel;
252b86c4 1132 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1133
cd8ffc80
JB		 1134 /*
1135 * If this flag is set to true anywhere, and we get here,
1136 * we are doing the needed processing, so remove the flag
1137 * now.
1138 */
1139 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1140
58d4185e
JB		 1141 hdr = (struct ieee80211_hdr *) skb->data;
1142
3f0e0b22 1143 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
f14543ee 1144 tx->sta = rcu_dereference(sdata->u.vlan.sta);
3f0e0b22
FF		 1145 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1146 return TX_DROP;
b4d57adb
FF		 1147 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1148 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
3f0e0b22 1149 }
f14543ee 1150 if (!tx->sta)
abe60632 1151 tx->sta = sta_info_get(sdata, hdr->addr1);
58d4185e 1152
cd8ffc80 1153 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1154 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
edf6b784
AN		 1155 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1156 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1157 struct tid_ampdu_tx *tid_tx;
1158
8b30b1fe
S		 1159 qc = ieee80211_get_qos_ctl(hdr);
1160 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1161
a622ab72
JB		 1162 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1163 if (tid_tx) {
1164 bool queued;
cd8ffc80 1165
a622ab72
JB		 1166 queued = ieee80211_tx_prep_agg(tx, skb, info,
1167 tid_tx, tid);
1168
1169 if (unlikely(queued))
1170 return TX_QUEUED;
1171 }
8b30b1fe
S		 1172 }
1173
badffb72 1174 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1175 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1176 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1177 } else
5cf121c3 1178 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1179
a26eb27a
JB		 1180 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1181 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1182 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1183 info->flags & IEEE80211_TX_CTL_AMPDU)
1184 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1185 }
1186
e2ebc74d 1187 if (!tx->sta)
e039fa4a 1188 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
c2c98fde 1189 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
e039fa4a 1190 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
58d4185e 1191
e039fa4a 1192 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1193
9ae54c84 1194 return TX_CONTINUE;
e2ebc74d
JB		 1195}
1196
11127e91
JB		 1197static bool ieee80211_tx_frags(struct ieee80211_local *local,
1198 struct ieee80211_vif *vif,
1199 struct ieee80211_sta *sta,
1200 struct sk_buff_head *skbs,
1201 bool txpending)
e2ebc74d 1202{
252b86c4 1203 struct sk_buff *skb, *tmp;
f8e79ddd 1204 struct ieee80211_tx_info *info;
3b8d81e0 1205 unsigned long flags;
e2ebc74d 1206
252b86c4 1207 skb_queue_walk_safe(skbs, skb, tmp) {
3b8d81e0
JB		 1208 int q = skb_get_queue_mapping(skb);
1209
1210 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1211 if (local->queue_stop_reasons[q] ||
7bb45683
JB		 1212 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1213 /*
1214 * Since queue is stopped, queue up frames for later
1215 * transmission from the tx-pending tasklet when the
1216 * queue is woken again.
1217 */
252b86c4 1218 if (txpending)
4db4e0a1 1219 skb_queue_splice_init(skbs, &local->pending[q]);
252b86c4 1220 else
4db4e0a1
JB		 1221 skb_queue_splice_tail_init(skbs,
1222 &local->pending[q]);
7bb45683
JB		 1223
1224 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1225 flags);
1226 return false;
1227 }
3b8d81e0 1228 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1229
f0e72851 1230 info = IEEE80211_SKB_CB(skb);
11127e91
JB		 1231 info->control.vif = vif;
1232 info->control.sta = sta;
f0e72851 1233
11127e91
JB		 1234 __skb_unlink(skb, skbs);
1235 drv_tx(local, skb);
1236 }
5061b0c2 1237
11127e91
JB		 1238 return true;
1239}
1240
1241/*
1242 * Returns false if the frame couldn't be transmitted but was queued instead.
1243 */
1244static bool __ieee80211_tx(struct ieee80211_local *local,
1245 struct sk_buff_head *skbs, int led_len,
1246 struct sta_info *sta, bool txpending)
1247{
1248 struct ieee80211_tx_info *info;
1249 struct ieee80211_sub_if_data *sdata;
1250 struct ieee80211_vif *vif;
1251 struct ieee80211_sta *pubsta;
1252 struct sk_buff *skb;
1253 bool result = true;
1254 __le16 fc;
5061b0c2 1255
11127e91
JB		 1256 if (WARN_ON(skb_queue_empty(skbs)))
1257 return true;
ec25acc4 1258
11127e91
JB		 1259 skb = skb_peek(skbs);
1260 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1261 info = IEEE80211_SKB_CB(skb);
1262 sdata = vif_to_sdata(info->control.vif);
1263 if (sta && !sta->uploaded)
1264 sta = NULL;
1265
1266 if (sta)
1267 pubsta = &sta->sta;
1268 else
1269 pubsta = NULL;
1270
1271 switch (sdata->vif.type) {
1272 case NL80211_IFTYPE_MONITOR:
1273 sdata = NULL;
1274 vif = NULL;
1275 break;
1276 case NL80211_IFTYPE_AP_VLAN:
1277 sdata = container_of(sdata->bss,
1278 struct ieee80211_sub_if_data, u.ap);
1279 /* fall through */
1280 default:
1281 vif = &sdata->vif;
1282 break;
e2ebc74d 1283 }
2de8e0d9 1284
11127e91
JB		 1285 if (local->ops->tx_frags)
1286 drv_tx_frags(local, vif, pubsta, skbs);
1287 else
1288 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1289 txpending);
1290
74e4dbfd
JB		 1291 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1292 ieee80211_led_tx(local, 1);
1293
4db4e0a1 1294 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1295
11127e91 1296 return result;
e2ebc74d
JB		 1297}
1298
97b045d6
JB		 1299/*
1300 * Invoke TX handlers, return 0 on success and non-zero if the
1301 * frame was dropped or queued.
1302 */
1303static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1304{
252b86c4 1305 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1306 ieee80211_tx_result res = TX_DROP;
97b045d6 1307
9aa4aee3
JB		 1308#define CALL_TXH(txh) \
1309 do { \
1310 res = txh(tx); \
1311 if (res != TX_CONTINUE) \
1312 goto txh_done; \
1313 } while (0)
1314
5c1b98a5 1315 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1316 CALL_TXH(ieee80211_tx_h_check_assoc);
1317 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1318 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1319 CALL_TXH(ieee80211_tx_h_select_key);
af65cd96
JB		 1320 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1321 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1322
aa5b5492
JB		 1323 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1324 __skb_queue_tail(&tx->skbs, tx->skb);
1325 tx->skb = NULL;
c6fcf6bc 1326 goto txh_done;
aa5b5492 1327 }
c6fcf6bc
JB		 1328
1329 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1330 CALL_TXH(ieee80211_tx_h_sequence);
1331 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1332 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1333 CALL_TXH(ieee80211_tx_h_stats);
1334 CALL_TXH(ieee80211_tx_h_encrypt);
8fd369ee
AN		 1335 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1336 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1337#undef CALL_TXH
97b045d6 1338
d9e8a70f 1339 txh_done:
97b045d6 1340 if (unlikely(res == TX_DROP)) {
5479d0e7 1341 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4
JB		 1342 if (tx->skb)
1343 dev_kfree_skb(tx->skb);
1344 else
1345 __skb_queue_purge(&tx->skbs);
97b045d6
JB		 1346 return -1;
1347 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1348 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1349 return -1;
1350 }
1351
1352 return 0;
1353}
1354
7bb45683
JB		 1355/*
1356 * Returns false if the frame couldn't be transmitted but was queued instead.
1357 */
1358static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
3b8d81e0 1359 struct sk_buff *skb, bool txpending)
e2ebc74d 1360{
3b8d81e0 1361 struct ieee80211_local *local = sdata->local;
5cf121c3 1362 struct ieee80211_tx_data tx;
97b045d6 1363 ieee80211_tx_result res_prepare;
e039fa4a 1364 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1365 bool result = true;
74e4dbfd 1366 int led_len;
e2ebc74d 1367
e2ebc74d
JB		 1368 if (unlikely(skb->len < 10)) {
1369 dev_kfree_skb(skb);
7bb45683 1370 return true;
e2ebc74d
JB		 1371 }
1372
d0709a65
JB		 1373 rcu_read_lock();
1374
58d4185e 1375 /* initialises tx */
74e4dbfd 1376 led_len = skb->len;
3b8d81e0 1377 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
e2ebc74d 1378
cd8ffc80 1379 if (unlikely(res_prepare == TX_DROP)) {
e2ebc74d 1380 dev_kfree_skb(skb);
7bb45683 1381 goto out;
cd8ffc80 1382 } else if (unlikely(res_prepare == TX_QUEUED)) {
7bb45683 1383 goto out;
e2ebc74d
JB		 1384 }
1385
5cf121c3 1386 tx.channel = local->hw.conf.channel;
e039fa4a 1387 info->band = tx.channel->band;
e2ebc74d 1388
7bb45683 1389 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1390 result = __ieee80211_tx(local, &tx.skbs, led_len,
1391 tx.sta, txpending);
97b045d6 1392 out:
d4e46a3d 1393 rcu_read_unlock();
7bb45683 1394 return result;
e2ebc74d
JB		 1395}
1396
1397/* device xmit handlers */
1398
3bff1865 1399static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1400 struct sk_buff *skb,
1401 int head_need, bool may_encrypt)
1402{
3bff1865 1403 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1404 int tail_need = 0;
1405
3bff1865 1406 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1407 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1408 tail_need -= skb_tailroom(skb);
1409 tail_need = max_t(int, tail_need, 0);
1410 }
1411
fc7c976d 1412 if (skb_cloned(skb))
23c0752a 1413 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1414 else if (head_need || tail_need)
23c0752a 1415 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1416 else
1417 return 0;
23c0752a
JB		 1418
1419 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1420 wiphy_debug(local->hw.wiphy,
1421 "failed to reallocate TX buffer\n");
23c0752a
JB		 1422 return -ENOMEM;
1423 }
1424
23c0752a
JB		 1425 return 0;
1426}
1427
ce662b44 1428void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
e2ebc74d 1429{
3b8d81e0 1430 struct ieee80211_local *local = sdata->local;
e039fa4a 1431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1433 int headroom;
23c0752a 1434 bool may_encrypt;
e2ebc74d 1435
d84f3234
JB		 1436 rcu_read_lock();
1437
3b8d81e0 1438 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1439
3b8d81e0 1440 headroom = local->tx_headroom;
23c0752a
JB		 1441 if (may_encrypt)
1442 headroom += IEEE80211_ENCRYPT_HEADROOM;
1443 headroom -= skb_headroom(skb);
1444 headroom = max_t(int, 0, headroom);
1445
3bff1865 1446 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
23c0752a 1447 dev_kfree_skb(skb);
d84f3234 1448 rcu_read_unlock();
3b8d81e0 1449 return;
e2ebc74d
JB		 1450 }
1451
740c1aa3 1452 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1453 info->control.vif = &sdata->vif;
e2ebc74d 1454
cca89496
JC		 1455 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1456 ieee80211_is_data(hdr->frame_control) &&
1457 !is_multicast_ether_addr(hdr->addr1))
0cfda851 1458 if (mesh_nexthop_resolve(skb, sdata)) {
cca89496 1459 /* skb queued: don't free */
d84f3234 1460 rcu_read_unlock();
cca89496
JC		 1461 return;
1462 }
1463
2154c81c 1464 ieee80211_set_qos_hdr(sdata, skb);
3b8d81e0 1465 ieee80211_tx(sdata, skb, false);
d84f3234 1466 rcu_read_unlock();
e2ebc74d
JB		 1467}
1468
73b9f03a
JB		 1469static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1470{
1471 struct ieee80211_radiotap_iterator iterator;
1472 struct ieee80211_radiotap_header *rthdr =
1473 (struct ieee80211_radiotap_header *) skb->data;
1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1475 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1476 NULL);
1477 u16 txflags;
1478
1479 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1480 IEEE80211_TX_CTL_DONTFRAG;
1481
1482 /*
1483 * for every radiotap entry that is present
1484 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1485 * entries present, or -EINVAL on error)
1486 */
1487
1488 while (!ret) {
1489 ret = ieee80211_radiotap_iterator_next(&iterator);
1490
1491 if (ret)
1492 continue;
1493
1494 /* see if this argument is something we can use */
1495 switch (iterator.this_arg_index) {
1496 /*
1497 * You must take care when dereferencing iterator.this_arg
1498 * for multibyte types... the pointer is not aligned. Use
1499 * get_unaligned((type *)iterator.this_arg) to dereference
1500 * iterator.this_arg for type "type" safely on all arches.
1501 */
1502 case IEEE80211_RADIOTAP_FLAGS:
1503 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1504 /*
1505 * this indicates that the skb we have been
1506 * handed has the 32-bit FCS CRC at the end...
1507 * we should react to that by snipping it off
1508 * because it will be recomputed and added
1509 * on transmission
1510 */
1511 if (skb->len < (iterator._max_length + FCS_LEN))
1512 return false;
1513
1514 skb_trim(skb, skb->len - FCS_LEN);
1515 }
1516 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1517 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1518 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1519 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1520 break;
1521
1522 case IEEE80211_RADIOTAP_TX_FLAGS:
1523 txflags = get_unaligned_le16(iterator.this_arg);
1524 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1525 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1526 break;
1527
1528 /*
1529 * Please update the file
1530 * Documentation/networking/mac80211-injection.txt
1531 * when parsing new fields here.
1532 */
1533
1534 default:
1535 break;
1536 }
1537 }
1538
1539 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1540 return false;
1541
1542 /*
1543 * remove the radiotap header
1544 * iterator->_max_length was sanity-checked against
1545 * skb->len by iterator init
1546 */
1547 skb_pull(skb, iterator._max_length);
1548
1549 return true;
1550}
1551
d0cf9c0d
SH		 1552netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1553 struct net_device *dev)
e2ebc74d
JB		 1554{
1555 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
47f4d887 1556 struct ieee80211_channel *chan = local->hw.conf.channel;
e2ebc74d
JB		 1557 struct ieee80211_radiotap_header *prthdr =
1558 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1559 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1560 struct ieee80211_hdr *hdr;
5d9cf4a5 1561 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
9b8a74e3 1562 u16 len_rthdr;
5d9cf4a5 1563 int hdrlen;
e2ebc74d 1564
47f4d887
LR		 1565 /*
1566 * Frame injection is not allowed if beaconing is not allowed
1567 * or if we need radar detection. Beaconing is usually not allowed when
1568 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1569 * Passive scan is also used in world regulatory domains where
1570 * your country is not known and as such it should be treated as
1571 * NO TX unless the channel is explicitly allowed in which case
1572 * your current regulatory domain would not have the passive scan
1573 * flag.
1574 *
1575 * Since AP mode uses monitor interfaces to inject/TX management
1576 * frames we can make AP mode the exception to this rule once it
1577 * supports radar detection as its implementation can deal with
1578 * radar detection by itself. We can do that later by adding a
1579 * monitor flag interfaces used for AP support.
1580 */
1581 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1582 IEEE80211_CHAN_PASSIVE_SCAN)))
1583 goto fail;
1584
9b8a74e3
AG		 1585 /* check for not even having the fixed radiotap header part */
1586 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1587 goto fail; /* too short to be possibly valid */
1588
1589 /* is it a header version we can trust to find length from? */
1590 if (unlikely(prthdr->it_version))
1591 goto fail; /* only version 0 is supported */
1592
1593 /* then there must be a radiotap header with a length we can use */
1594 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1595
1596 /* does the skb contain enough to deliver on the alleged length? */
1597 if (unlikely(skb->len < len_rthdr))
1598 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1599
e2ebc74d
JB		 1600 /*
1601 * fix up the pointers accounting for the radiotap
1602 * header still being in there. We are being given
1603 * a precooked IEEE80211 header so no need for
1604 * normal processing
1605 */
9b8a74e3 1606 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1607 /*
9b8a74e3
AG		 1608 * these are just fixed to the end of the rt area since we
1609 * don't have any better information and at this point, nobody cares
e2ebc74d 1610 */
9b8a74e3
AG		 1611 skb_set_network_header(skb, len_rthdr);
1612 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1613
5d9cf4a5
JB		 1614 if (skb->len < len_rthdr + 2)
1615 goto fail;
1616
1617 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1618 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1619
1620 if (skb->len < len_rthdr + hdrlen)
1621 goto fail;
1622
f75f5c6f
HS		 1623 /*
1624 * Initialize skb->protocol if the injected frame is a data frame
1625 * carrying a rfc1042 header
1626 */
5d9cf4a5
JB		 1627 if (ieee80211_is_data(hdr->frame_control) &&
1628 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1629 u8 *payload = (u8 *)hdr + hdrlen;
1630
1631 if (compare_ether_addr(payload, rfc1042_header) == 0)
1632 skb->protocol = cpu_to_be16((payload[6] << 8) |
1633 payload[7]);
f75f5c6f
HS		 1634 }
1635
3b8d81e0
JB		 1636 memset(info, 0, sizeof(*info));
1637
5d9cf4a5 1638 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1639 IEEE80211_TX_CTL_INJECTED;
1640
1641 /* process and remove the injection radiotap header */
1642 if (!ieee80211_parse_tx_radiotap(skb))
1643 goto fail;
5d9cf4a5
JB		 1644
1645 rcu_read_lock();
1646
1647 /*
1648 * We process outgoing injected frames that have a local address
1649 * we handle as though they are non-injected frames.
1650 * This code here isn't entirely correct, the local MAC address
1651 * isn't always enough to find the interface to use; for proper
1652 * VLAN/WDS support we will need a different mechanism (which
1653 * likely isn't going to be monitor interfaces).
1654 */
1655 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1656
1657 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1658 if (!ieee80211_sdata_running(tmp_sdata))
1659 continue;
1660 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1661 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1662 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1663 continue;
1664 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
1665 sdata = tmp_sdata;
1666 break;
1667 }
1668 }
7351c6bd 1669
5d9cf4a5
JB		 1670 ieee80211_xmit(sdata, skb);
1671 rcu_read_unlock();
1672
e2ebc74d 1673 return NETDEV_TX_OK;
9b8a74e3
AG		 1674
1675fail:
1676 dev_kfree_skb(skb);
1677 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1678}
1679
1680/**
1681 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1682 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1683 * @skb: packet to be sent
1684 * @dev: incoming interface
1685 *
1686 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1687 * not be freed, and caller is responsible for either retrying later or freeing
1688 * skb).
1689 *
1690 * This function takes in an Ethernet header and encapsulates it with suitable
1691 * IEEE 802.11 header based on which interface the packet is coming in. The
1692 * encapsulated packet will then be passed to master interface, wlan#.11, for
1693 * transmission (through low-level driver).
1694 */
d0cf9c0d
SH		 1695netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1696 struct net_device *dev)
e2ebc74d 1697{
133b8226
JB		 1698 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1699 struct ieee80211_local *local = sdata->local;
489ee919 1700 struct ieee80211_tx_info *info;
5b548140 1701 int ret = NETDEV_TX_BUSY, head_need;
065e9605
HH		 1702 u16 ethertype, hdrlen, meshhdrlen = 0;
1703 __le16 fc;
e2ebc74d 1704 struct ieee80211_hdr hdr;
ff67bb86 1705 struct ieee80211s_hdr mesh_hdr __maybe_unused;
0a65169b 1706 struct mesh_path __maybe_unused *mppath = NULL;
e2ebc74d
JB		 1707 const u8 *encaps_data;
1708 int encaps_len, skip_header_bytes;
e8bf9649 1709 int nh_pos, h_pos;
f14543ee 1710 struct sta_info *sta = NULL;
c2c98fde 1711 bool wme_sta = false, authorized = false, tdls_auth = false;
941c93cd 1712 bool tdls_direct = false;
a729cff8
JB		 1713 bool multicast;
1714 u32 info_flags = 0;
1715 u16 info_id = 0;
e2ebc74d 1716
e2ebc74d 1717 if (unlikely(skb->len < ETH_HLEN)) {
ec634fe3 1718 ret = NETDEV_TX_OK;
e2ebc74d
JB		 1719 goto fail;
1720 }
1721
e2ebc74d
JB		 1722 /* convert Ethernet header to proper 802.11 header (based on
1723 * operation mode) */
1724 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 1725 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 1726
51fb61e7 1727 switch (sdata->vif.type) {
05c914fe 1728 case NL80211_IFTYPE_AP_VLAN:
f14543ee 1729 rcu_read_lock();
9bc383de 1730 sta = rcu_dereference(sdata->u.vlan.sta);
f14543ee
FF		 1731 if (sta) {
1732 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1733 /* RA TA DA SA */
1734 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 1735 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1736 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1737 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1738 hdrlen = 30;
c2c98fde
JB		 1739 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1740 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
f14543ee
FF		 1741 }
1742 rcu_read_unlock();
1743 if (sta)
1744 break;
1745 /* fall through */
1746 case NL80211_IFTYPE_AP:
065e9605 1747 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 1748 /* DA BSSID SA */
1749 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 1750 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1751 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1752 hdrlen = 24;
cf966838 1753 break;
05c914fe 1754 case NL80211_IFTYPE_WDS:
065e9605 1755 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 1756 /* RA TA DA SA */
1757 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 1758 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1759 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1760 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1761 hdrlen = 30;
cf966838 1762 break;
33b64eb2 1763#ifdef CONFIG_MAC80211_MESH
05c914fe 1764 case NL80211_IFTYPE_MESH_POINT:
472dbc45 1765 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
e32f85f7 1766 /* Do not send frames with mesh_ttl == 0 */
472dbc45 1767 sdata->u.mesh.mshstats.dropped_frames_ttl++;
ec634fe3 1768 ret = NETDEV_TX_OK;
e32f85f7 1769 goto fail;
33b64eb2 1770 }
28104cae 1771 rcu_read_lock();
f76b57b4
JF		 1772 if (!is_multicast_ether_addr(skb->data))
1773 mppath = mpp_path_lookup(skb->data, sdata);
79617dee 1774
f76b57b4 1775 /*
9d52501b
JF		 1776 * Use address extension if it is a packet from
1777 * another interface or if we know the destination
1778 * is being proxied by a portal (i.e. portal address
1779 * differs from proxied address)
f76b57b4 1780 */
47846c9b 1781 if (compare_ether_addr(sdata->vif.addr,
f76b57b4 1782 skb->data + ETH_ALEN) == 0 &&
9d52501b 1783 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
3c5772a5
JC		 1784 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1785 skb->data, skb->data + ETH_ALEN);
28104cae 1786 rcu_read_unlock();
3c5772a5 1787 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
61ad5394 1788 sdata, NULL, NULL);
79617dee 1789 } else {
3c5772a5 1790 int is_mesh_mcast = 1;
15ff6365 1791 const u8 *mesh_da;
79617dee 1792
79617dee 1793 if (is_multicast_ether_addr(skb->data))
3c5772a5
JC		 1794 /* DA TA mSA AE:SA */
1795 mesh_da = skb->data;
79617dee 1796 else {
15ff6365
JB		 1797 static const u8 bcast[ETH_ALEN] =
1798 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
3c5772a5
JC		 1799 if (mppath) {
1800 /* RA TA mDA mSA AE:DA SA */
1801 mesh_da = mppath->mpp;
1802 is_mesh_mcast = 0;
15ff6365 1803 } else {
3c5772a5 1804 /* DA TA mSA AE:SA */
15ff6365
JB		 1805 mesh_da = bcast;
1806 }
79617dee 1807 }
3c5772a5 1808 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 1809 mesh_da, sdata->vif.addr);
3c5772a5
JC		 1810 rcu_read_unlock();
1811 if (is_mesh_mcast)
1812 meshhdrlen =
1813 ieee80211_new_mesh_header(&mesh_hdr,
1814 sdata,
1815 skb->data + ETH_ALEN,
3c5772a5
JC		 1816 NULL);
1817 else
1818 meshhdrlen =
1819 ieee80211_new_mesh_header(&mesh_hdr,
1820 sdata,
3c5772a5
JC		 1821 skb->data,
1822 skb->data + ETH_ALEN);
79617dee 1823
79617dee 1824 }
33b64eb2
LCC		 1825 break;
1826#endif
05c914fe 1827 case NL80211_IFTYPE_STATION:
941c93cd 1828 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
c2c98fde
JB		 1829 bool tdls_peer = false;
1830
941c93cd
AN		 1831 rcu_read_lock();
1832 sta = sta_info_get(sdata, skb->data);
c2c98fde
JB		 1833 if (sta) {
1834 authorized = test_sta_flag(sta,
1835 WLAN_STA_AUTHORIZED);
1836 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1837 tdls_peer = test_sta_flag(sta,
1838 WLAN_STA_TDLS_PEER);
1839 tdls_auth = test_sta_flag(sta,
1840 WLAN_STA_TDLS_PEER_AUTH);
1841 }
941c93cd
AN		 1842 rcu_read_unlock();
1843
1844 /*
1845 * If the TDLS link is enabled, send everything
1846 * directly. Otherwise, allow TDLS setup frames
1847 * to be transmitted indirectly.
1848 */
c2c98fde 1849 tdls_direct = tdls_peer && (tdls_auth ||
941c93cd
AN		 1850 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1851 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1852 }
1853
1854 if (tdls_direct) {
1855 /* link during setup - throw out frames to peer */
c2c98fde 1856 if (!tdls_auth) {
941c93cd
AN		 1857 ret = NETDEV_TX_OK;
1858 goto fail;
1859 }
1860
1861 /* DA SA BSSID */
1862 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1863 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1864 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1865 hdrlen = 24;
1866 } else if (sdata->u.mgd.use_4addr &&
1867 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1868 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1869 IEEE80211_FCTL_TODS);
f14543ee 1870 /* RA TA DA SA */
941c93cd 1871 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 1872 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1873 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1874 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1875 hdrlen = 30;
1876 } else {
1877 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1878 /* BSSID SA DA */
941c93cd 1879 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 1880 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1881 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1882 hdrlen = 24;
1883 }
cf966838 1884 break;
05c914fe 1885 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 1886 /* DA SA BSSID */
1887 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1888 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 1889 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 1890 hdrlen = 24;
cf966838
JB		 1891 break;
1892 default:
ec634fe3 1893 ret = NETDEV_TX_OK;
e2ebc74d
JB		 1894 goto fail;
1895 }
1896
7d185b8b
JB		 1897 /*
1898 * There's no need to try to look up the destination
1899 * if it is a multicast address (which can only happen
1900 * in AP mode)
1901 */
a729cff8
JB		 1902 multicast = is_multicast_ether_addr(hdr.addr1);
1903 if (!multicast) {
d0709a65 1904 rcu_read_lock();
abe60632 1905 sta = sta_info_get(sdata, hdr.addr1);
c2c98fde
JB		 1906 if (sta) {
1907 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1908 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1909 }
d0709a65 1910 rcu_read_unlock();
e2ebc74d
JB		 1911 }
1912
4777be41
JC		 1913 /* For mesh, the use of the QoS header is mandatory */
1914 if (ieee80211_vif_is_mesh(&sdata->vif))
c2c98fde 1915 wme_sta = true;
4777be41 1916
3434fbd3 1917 /* receiver and we are QoS enabled, use a QoS type frame */
c2c98fde 1918 if (wme_sta && local->hw.queues >= 4) {
065e9605 1919 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 1920 hdrlen += 2;
1921 }
1922
1923 /*
238814fd
JB		 1924 * Drop unicast frames to unauthorised stations unless they are
1925 * EAPOL frames from the local station.
ce3edf6d 1926 */
55182e4a
JB		 1927 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1928 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1929 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1930 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 1931#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
ce3edf6d 1932 if (net_ratelimit())
0c68ae26 1933 printk(KERN_DEBUG "%s: dropped frame to %pM"
ce3edf6d 1934 " (unauthorized port)\n", dev->name,
0c68ae26 1935 hdr.addr1);
ce3edf6d
JB		 1936#endif
1937
1938 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1939
ec634fe3 1940 ret = NETDEV_TX_OK;
ce3edf6d
JB		 1941 goto fail;
1942 }
1943
a729cff8
JB		 1944 if (unlikely(!multicast && skb->sk &&
1945 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1946 struct sk_buff *orig_skb = skb;
1947
1948 skb = skb_clone(skb, GFP_ATOMIC);
1949 if (skb) {
1950 unsigned long flags;
1951 int id, r;
1952
1953 spin_lock_irqsave(&local->ack_status_lock, flags);
1954 r = idr_get_new_above(&local->ack_status_frames,
1955 orig_skb, 1, &id);
1956 if (r == -EAGAIN) {
1957 idr_pre_get(&local->ack_status_frames,
1958 GFP_ATOMIC);
1959 r = idr_get_new_above(&local->ack_status_frames,
1960 orig_skb, 1, &id);
1961 }
1962 if (WARN_ON(!id) || id > 0xffff) {
1963 idr_remove(&local->ack_status_frames, id);
1964 r = -ERANGE;
1965 }
1966 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1967
1968 if (!r) {
1969 info_id = id;
1970 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1971 } else if (skb_shared(skb)) {
1972 kfree_skb(orig_skb);
1973 } else {
1974 kfree_skb(skb);
1975 skb = orig_skb;
1976 }
1977 } else {
1978 /* couldn't clone -- lose tx status ... */
1979 skb = orig_skb;
1980 }
1981 }
1982
7e244707
HS		 1983 /*
1984 * If the skb is shared we need to obtain our own copy.
1985 */
1986 if (skb_shared(skb)) {
a729cff8
JB		 1987 struct sk_buff *tmp_skb = skb;
1988
1989 /* can't happen -- skb is a clone if info_id != 0 */
1990 WARN_ON(info_id);
1991
f8a0a781 1992 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 1993 kfree_skb(tmp_skb);
1994
1995 if (!skb) {
1996 ret = NETDEV_TX_OK;
1997 goto fail;
1998 }
1999 }
2000
065e9605 2001 hdr.frame_control = fc;
e2ebc74d
JB		 2002 hdr.duration_id = 0;
2003 hdr.seq_ctrl = 0;
2004
2005 skip_header_bytes = ETH_HLEN;
2006 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2007 encaps_data = bridge_tunnel_header;
2008 encaps_len = sizeof(bridge_tunnel_header);
2009 skip_header_bytes -= 2;
2010 } else if (ethertype >= 0x600) {
2011 encaps_data = rfc1042_header;
2012 encaps_len = sizeof(rfc1042_header);
2013 skip_header_bytes -= 2;
2014 } else {
2015 encaps_data = NULL;
2016 encaps_len = 0;
2017 }
2018
7e244707
HS		 2019 nh_pos = skb_network_header(skb) - skb->data;
2020 h_pos = skb_transport_header(skb) - skb->data;
2021
e2ebc74d
JB		 2022 skb_pull(skb, skip_header_bytes);
2023 nh_pos -= skip_header_bytes;
2024 h_pos -= skip_header_bytes;
2025
23c0752a 2026 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2027
23c0752a
JB		 2028 /*
2029 * So we need to modify the skb header and hence need a copy of
2030 * that. The head_need variable above doesn't, so far, include
2031 * the needed header space that we don't need right away. If we
2032 * can, then we don't reallocate right now but only after the
2033 * frame arrives at the master device (if it does...)
2034 *
2035 * If we cannot, however, then we will reallocate to include all
2036 * the ever needed space. Also, if we need to reallocate it anyway,
2037 * make it big enough for everything we may ever need.
2038 */
e2ebc74d 2039
3a5be7d4 2040 if (head_need > 0 || skb_cloned(skb)) {
23c0752a
JB		 2041 head_need += IEEE80211_ENCRYPT_HEADROOM;
2042 head_need += local->tx_headroom;
2043 head_need = max_t(int, 0, head_need);
3bff1865 2044 if (ieee80211_skb_resize(sdata, skb, head_need, true))
e2ebc74d 2045 goto fail;
e2ebc74d
JB		 2046 }
2047
2048 if (encaps_data) {
2049 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2050 nh_pos += encaps_len;
2051 h_pos += encaps_len;
2052 }
c29b9b9b 2053
e4ab7eb0 2054#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2055 if (meshhdrlen > 0) {
2056 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2057 nh_pos += meshhdrlen;
2058 h_pos += meshhdrlen;
2059 }
e4ab7eb0 2060#endif
33b64eb2 2061
065e9605 2062 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2063 __le16 *qos_control;
2064
2065 qos_control = (__le16*) skb_push(skb, 2);
2066 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2067 /*
2068 * Maybe we could actually set some fields here, for now just
2069 * initialise to zero to indicate no special operation.
2070 */
2071 *qos_control = 0;
2072 } else
2073 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2074
e2ebc74d
JB		 2075 nh_pos += hdrlen;
2076 h_pos += hdrlen;
2077
68aae116
SH		 2078 dev->stats.tx_packets++;
2079 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 2080
2081 /* Update skb pointers to various headers since this modified frame
2082 * is going to go through Linux networking code that may potentially
2083 * need things like pointer to IP header. */
2084 skb_set_mac_header(skb, 0);
2085 skb_set_network_header(skb, nh_pos);
2086 skb_set_transport_header(skb, h_pos);
2087
489ee919 2088 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2089 memset(info, 0, sizeof(*info));
2090
e2ebc74d 2091 dev->trans_start = jiffies;
a729cff8
JB		 2092
2093 info->flags = info_flags;
2094 info->ack_frame_id = info_id;
2095
3b8d81e0 2096 ieee80211_xmit(sdata, skb);
e2ebc74d 2097
ec634fe3 2098 return NETDEV_TX_OK;
e2ebc74d
JB		 2099
2100 fail:
ec634fe3 2101 if (ret == NETDEV_TX_OK)
e2ebc74d
JB		 2102 dev_kfree_skb(skb);
2103
2104 return ret;
2105}
2106
e2ebc74d 2107
e2530083
JB		 2108/*
2109 * ieee80211_clear_tx_pending may not be called in a context where
2110 * it is possible that it packets could come in again.
2111 */
e2ebc74d
JB		 2112void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2113{
2de8e0d9 2114 int i;
e2ebc74d 2115
2a577d98
JB		 2116 for (i = 0; i < local->hw.queues; i++)
2117 skb_queue_purge(&local->pending[i]);
e2ebc74d
JB		 2118}
2119
7bb45683
JB		 2120/*
2121 * Returns false if the frame couldn't be transmitted but was queued instead,
2122 * which in this case means re-queued -- take as an indication to stop sending
2123 * more pending frames.
2124 */
cd8ffc80
JB		 2125static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2126 struct sk_buff *skb)
2127{
2128 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2129 struct ieee80211_sub_if_data *sdata;
2130 struct sta_info *sta;
2131 struct ieee80211_hdr *hdr;
7bb45683 2132 bool result;
cd8ffc80 2133
5061b0c2 2134 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 2135
2136 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
7bb45683 2137 result = ieee80211_tx(sdata, skb, true);
cd8ffc80 2138 } else {
252b86c4
JB		 2139 struct sk_buff_head skbs;
2140
2141 __skb_queue_head_init(&skbs);
2142 __skb_queue_tail(&skbs, skb);
2143
cd8ffc80 2144 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 2145 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 2146
74e4dbfd 2147 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 2148 }
2149
cd8ffc80
JB		 2150 return result;
2151}
2152
e2530083 2153/*
3b8d81e0 2154 * Transmit all pending packets. Called from tasklet.
e2530083 2155 */
e2ebc74d
JB		 2156void ieee80211_tx_pending(unsigned long data)
2157{
2158 struct ieee80211_local *local = (struct ieee80211_local *)data;
7236fe29 2159 struct ieee80211_sub_if_data *sdata;
2a577d98 2160 unsigned long flags;
cd8ffc80 2161 int i;
3b8d81e0 2162 bool txok;
e2ebc74d 2163
f0e72851 2164 rcu_read_lock();
e2530083 2165
3b8d81e0 2166 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 2167 for (i = 0; i < local->hw.queues; i++) {
2168 /*
2169 * If queue is stopped by something other than due to pending
2170 * frames, or we have no pending frames, proceed to next queue.
2171 */
3b8d81e0 2172 if (local->queue_stop_reasons[i] ||
2a577d98 2173 skb_queue_empty(&local->pending[i]))
e2ebc74d 2174 continue;
e2530083 2175
2a577d98 2176 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 2177 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 2178 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 2179
a7bc376c
JB		 2180 if (WARN_ON(!info->control.vif)) {
2181 kfree_skb(skb);
2182 continue;
2183 }
2184
3b8d81e0
JB		 2185 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2186 flags);
2187
2188 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 2189 spin_lock_irqsave(&local->queue_stop_reason_lock,
2190 flags);
2191 if (!txok)
2a577d98 2192 break;
e2ebc74d 2193 }
7236fe29
JB		 2194
2195 if (skb_queue_empty(&local->pending[i]))
2196 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2337db8d 2197 netif_wake_subqueue(sdata->dev, i);
e2ebc74d 2198 }
3b8d81e0 2199 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 2200
f0e72851 2201 rcu_read_unlock();
e2ebc74d
JB		 2202}
2203
2204/* functions for drivers to get certain frames */
2205
8e7be8da 2206static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
5dfdaf58
JB		 2207 struct sk_buff *skb,
2208 struct beacon_data *beacon)
e2ebc74d
JB		 2209{
2210 u8 *pos, *tim;
2211 int aid0 = 0;
2212 int i, have_bits = 0, n1, n2;
2213
2214 /* Generate bitmap for TIM only if there are any STAs in power save
2215 * mode. */
e2ebc74d
JB		 2216 if (atomic_read(&bss->num_sta_ps) > 0)
2217 /* in the hope that this is faster than
2218 * checking byte-for-byte */
2219 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2220 IEEE80211_MAX_AID+1);
2221
2222 if (bss->dtim_count == 0)
5dfdaf58 2223 bss->dtim_count = beacon->dtim_period - 1;
e2ebc74d
JB		 2224 else
2225 bss->dtim_count--;
2226
2227 tim = pos = (u8 *) skb_put(skb, 6);
2228 *pos++ = WLAN_EID_TIM;
2229 *pos++ = 4;
2230 *pos++ = bss->dtim_count;
5dfdaf58 2231 *pos++ = beacon->dtim_period;
e2ebc74d
JB		 2232
2233 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2234 aid0 = 1;
2235
512119b3
CL		 2236 bss->dtim_bc_mc = aid0 == 1;
2237
e2ebc74d
JB		 2238 if (have_bits) {
2239 /* Find largest even number N1 so that bits numbered 1 through
2240 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2241 * (N2 + 1) x 8 through 2007 are 0. */
2242 n1 = 0;
2243 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2244 if (bss->tim[i]) {
2245 n1 = i & 0xfe;
2246 break;
2247 }
2248 }
2249 n2 = n1;
2250 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2251 if (bss->tim[i]) {
2252 n2 = i;
2253 break;
2254 }
2255 }
2256
2257 /* Bitmap control */
2258 *pos++ = n1 | aid0;
2259 /* Part Virt Bitmap */
5220da39 2260 skb_put(skb, n2 - n1);
e2ebc74d
JB		 2261 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2262
2263 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 2264 } else {
2265 *pos++ = aid0; /* Bitmap control */
2266 *pos++ = 0; /* Part Virt Bitmap */
2267 }
e2ebc74d
JB		 2268}
2269
eddcbb94
JB		 2270struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2271 struct ieee80211_vif *vif,
2272 u16 *tim_offset, u16 *tim_length)
e2ebc74d
JB		 2273{
2274 struct ieee80211_local *local = hw_to_local(hw);
9d139c81 2275 struct sk_buff *skb = NULL;
e039fa4a 2276 struct ieee80211_tx_info *info;
e2ebc74d
JB		 2277 struct ieee80211_sub_if_data *sdata = NULL;
2278 struct ieee80211_if_ap *ap = NULL;
5dfdaf58 2279 struct beacon_data *beacon;
8318d78a 2280 struct ieee80211_supported_band *sband;
2e92e6f2 2281 enum ieee80211_band band = local->hw.conf.channel->band;
e00cfce0 2282 struct ieee80211_tx_rate_control txrc;
8318d78a 2283
2e92e6f2 2284 sband = local->hw.wiphy->bands[band];
5dfdaf58
JB		 2285
2286 rcu_read_lock();
e2ebc74d 2287
32bfd35d 2288 sdata = vif_to_sdata(vif);
e2ebc74d 2289
eb3e554b
FF		 2290 if (!ieee80211_sdata_running(sdata))
2291 goto out;
2292
eddcbb94
JB		 2293 if (tim_offset)
2294 *tim_offset = 0;
2295 if (tim_length)
2296 *tim_length = 0;
2297
05c914fe 2298 if (sdata->vif.type == NL80211_IFTYPE_AP) {
33b64eb2
LCC		 2299 ap = &sdata->u.ap;
2300 beacon = rcu_dereference(ap->beacon);
3ad97fbc 2301 if (beacon) {
902acc78
JB		 2302 /*
2303 * headroom, head length,
2304 * tail length and maximum TIM length
2305 */
2306 skb = dev_alloc_skb(local->tx_headroom +
2307 beacon->head_len +
2308 beacon->tail_len + 256);
2309 if (!skb)
2310 goto out;
33b64eb2 2311
902acc78
JB		 2312 skb_reserve(skb, local->tx_headroom);
2313 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2314 beacon->head_len);
33b64eb2 2315
d0709a65
JB		 2316 /*
2317 * Not very nice, but we want to allow the driver to call
2318 * ieee80211_beacon_get() as a response to the set_tim()
2319 * callback. That, however, is already invoked under the
2320 * sta_lock to guarantee consistent and race-free update
2321 * of the tim bitmap in mac80211 and the driver.
2322 */
2323 if (local->tim_in_locked_section) {
8e7be8da 2324 ieee80211_beacon_add_tim(ap, skb, beacon);
d0709a65
JB		 2325 } else {
2326 unsigned long flags;
2327
4d33960b 2328 spin_lock_irqsave(&local->tim_lock, flags);
8e7be8da 2329 ieee80211_beacon_add_tim(ap, skb, beacon);
4d33960b 2330 spin_unlock_irqrestore(&local->tim_lock, flags);
d0709a65 2331 }
33b64eb2 2332
eddcbb94
JB		 2333 if (tim_offset)
2334 *tim_offset = beacon->head_len;
2335 if (tim_length)
2336 *tim_length = skb->len - beacon->head_len;
2337
902acc78
JB		 2338 if (beacon->tail)
2339 memcpy(skb_put(skb, beacon->tail_len),
2340 beacon->tail, beacon->tail_len);
9d139c81
JB		 2341 } else
2342 goto out;
05c914fe 2343 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 2344 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 2345 struct ieee80211_hdr *hdr;
af8cdcd8 2346 struct sk_buff *presp = rcu_dereference(ifibss->presp);
33b64eb2 2347
af8cdcd8 2348 if (!presp)
9d139c81
JB		 2349 goto out;
2350
af8cdcd8 2351 skb = skb_copy(presp, GFP_ATOMIC);
9d139c81
JB		 2352 if (!skb)
2353 goto out;
2354
2355 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 2356 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2357 IEEE80211_STYPE_BEACON);
902acc78 2358 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
472dbc45
JB		 2359 struct ieee80211_mgmt *mgmt;
2360 u8 *pos;
3b69a9c5
TP		 2361 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2362 sizeof(mgmt->u.beacon);
472dbc45 2363
ac1bd846
JB		 2364#ifdef CONFIG_MAC80211_MESH
2365 if (!sdata->u.mesh.mesh_id_len)
2366 goto out;
2367#endif
2368
3b69a9c5
TP		 2369 skb = dev_alloc_skb(local->tx_headroom +
2370 hdr_len +
2371 2 + /* NULL SSID */
2372 2 + 8 + /* supported rates */
2373 2 + 3 + /* DS params */
2374 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
176f3608
TP		 2375 2 + sizeof(struct ieee80211_ht_cap) +
2376 2 + sizeof(struct ieee80211_ht_info) +
3b69a9c5
TP		 2377 2 + sdata->u.mesh.mesh_id_len +
2378 2 + sizeof(struct ieee80211_meshconf_ie) +
2379 sdata->u.mesh.ie_len);
902acc78
JB		 2380 if (!skb)
2381 goto out;
2382
2383 skb_reserve(skb, local->hw.extra_tx_headroom);
3b69a9c5
TP		 2384 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2385 memset(mgmt, 0, hdr_len);
065e9605
HH		 2386 mgmt->frame_control =
2387 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
902acc78 2388 memset(mgmt->da, 0xff, ETH_ALEN);
47846c9b
JB		 2389 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2390 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
902acc78 2391 mgmt->u.beacon.beacon_int =
57c4d7b4 2392 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
082ebb0c
TP		 2393 mgmt->u.beacon.capab_info |= cpu_to_le16(
2394 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
902acc78
JB		 2395
2396 pos = skb_put(skb, 2);
2397 *pos++ = WLAN_EID_SSID;
2398 *pos++ = 0x0;
2399
768db343 2400 if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
082ebb0c 2401 mesh_add_ds_params_ie(skb, sdata) ||
768db343 2402 ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
082ebb0c 2403 mesh_add_rsn_ie(skb, sdata) ||
176f3608
TP		 2404 mesh_add_ht_cap_ie(skb, sdata) ||
2405 mesh_add_ht_info_ie(skb, sdata) ||
082ebb0c
TP		 2406 mesh_add_meshid_ie(skb, sdata) ||
2407 mesh_add_meshconf_ie(skb, sdata) ||
2408 mesh_add_vendor_ies(skb, sdata)) {
2409 pr_err("o11s: couldn't add ies!\n");
2410 goto out;
2411 }
9d139c81
JB		 2412 } else {
2413 WARN_ON(1);
5dfdaf58 2414 goto out;
e2ebc74d
JB		 2415 }
2416
e039fa4a
JB		 2417 info = IEEE80211_SKB_CB(skb);
2418
3b8d81e0 2419 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 2420 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 2421 info->band = band;
e00cfce0
JM		 2422
2423 memset(&txrc, 0, sizeof(txrc));
2424 txrc.hw = hw;
2425 txrc.sband = sband;
2426 txrc.bss_conf = &sdata->vif.bss_conf;
2427 txrc.skb = skb;
2428 txrc.reported_rate.idx = -1;
37eb0b16
JM		 2429 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2430 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2431 txrc.max_rate_idx = -1;
2432 else
2433 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 2434 txrc.bss = true;
e00cfce0 2435 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 2436
2437 info->control.vif = vif;
f591fa5d 2438
a472e71b
JL		 2439 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2440 IEEE80211_TX_CTL_ASSIGN_SEQ |
2441 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 2442 out:
5dfdaf58 2443 rcu_read_unlock();
e2ebc74d
JB		 2444 return skb;
2445}
eddcbb94 2446EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 2447
02945821
AN		 2448struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2449 struct ieee80211_vif *vif)
2450{
2451 struct ieee80211_if_ap *ap = NULL;
2452 struct sk_buff *presp = NULL, *skb = NULL;
2453 struct ieee80211_hdr *hdr;
2454 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2455
2456 if (sdata->vif.type != NL80211_IFTYPE_AP)
2457 return NULL;
2458
2459 rcu_read_lock();
2460
2461 ap = &sdata->u.ap;
2462 presp = rcu_dereference(ap->probe_resp);
2463 if (!presp)
2464 goto out;
2465
2466 skb = skb_copy(presp, GFP_ATOMIC);
2467 if (!skb)
2468 goto out;
2469
2470 hdr = (struct ieee80211_hdr *) skb->data;
2471 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2472
2473out:
2474 rcu_read_unlock();
2475 return skb;
2476}
2477EXPORT_SYMBOL(ieee80211_proberesp_get);
2478
7044cc56
KV		 2479struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2480 struct ieee80211_vif *vif)
2481{
2482 struct ieee80211_sub_if_data *sdata;
2483 struct ieee80211_if_managed *ifmgd;
2484 struct ieee80211_pspoll *pspoll;
2485 struct ieee80211_local *local;
2486 struct sk_buff *skb;
2487
2488 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2489 return NULL;
2490
2491 sdata = vif_to_sdata(vif);
2492 ifmgd = &sdata->u.mgd;
2493 local = sdata->local;
2494
2495 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 2496 if (!skb)
7044cc56 2497 return NULL;
d15b8459 2498
7044cc56
KV		 2499 skb_reserve(skb, local->hw.extra_tx_headroom);
2500
2501 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2502 memset(pspoll, 0, sizeof(*pspoll));
2503 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2504 IEEE80211_STYPE_PSPOLL);
2505 pspoll->aid = cpu_to_le16(ifmgd->aid);
2506
2507 /* aid in PS-Poll has its two MSBs each set to 1 */
2508 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2509
2510 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2511 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2512
2513 return skb;
2514}
2515EXPORT_SYMBOL(ieee80211_pspoll_get);
2516
2517struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2518 struct ieee80211_vif *vif)
2519{
2520 struct ieee80211_hdr_3addr *nullfunc;
2521 struct ieee80211_sub_if_data *sdata;
2522 struct ieee80211_if_managed *ifmgd;
2523 struct ieee80211_local *local;
2524 struct sk_buff *skb;
2525
2526 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2527 return NULL;
2528
2529 sdata = vif_to_sdata(vif);
2530 ifmgd = &sdata->u.mgd;
2531 local = sdata->local;
2532
2533 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 2534 if (!skb)
7044cc56 2535 return NULL;
d15b8459 2536
7044cc56
KV		 2537 skb_reserve(skb, local->hw.extra_tx_headroom);
2538
2539 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2540 sizeof(*nullfunc));
2541 memset(nullfunc, 0, sizeof(*nullfunc));
2542 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2543 IEEE80211_STYPE_NULLFUNC |
2544 IEEE80211_FCTL_TODS);
2545 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2546 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2547 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2548
2549 return skb;
2550}
2551EXPORT_SYMBOL(ieee80211_nullfunc_get);
2552
05e54ea6
KV		 2553struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2554 struct ieee80211_vif *vif,
2555 const u8 *ssid, size_t ssid_len,
2556 const u8 *ie, size_t ie_len)
2557{
2558 struct ieee80211_sub_if_data *sdata;
2559 struct ieee80211_local *local;
2560 struct ieee80211_hdr_3addr *hdr;
2561 struct sk_buff *skb;
2562 size_t ie_ssid_len;
2563 u8 *pos;
2564
2565 sdata = vif_to_sdata(vif);
2566 local = sdata->local;
2567 ie_ssid_len = 2 + ssid_len;
2568
2569 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2570 ie_ssid_len + ie_len);
d15b8459 2571 if (!skb)
05e54ea6 2572 return NULL;
05e54ea6
KV		 2573
2574 skb_reserve(skb, local->hw.extra_tx_headroom);
2575
2576 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2577 memset(hdr, 0, sizeof(*hdr));
2578 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2579 IEEE80211_STYPE_PROBE_REQ);
2580 memset(hdr->addr1, 0xff, ETH_ALEN);
2581 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2582 memset(hdr->addr3, 0xff, ETH_ALEN);
2583
2584 pos = skb_put(skb, ie_ssid_len);
2585 *pos++ = WLAN_EID_SSID;
2586 *pos++ = ssid_len;
2587 if (ssid)
2588 memcpy(pos, ssid, ssid_len);
2589 pos += ssid_len;
2590
2591 if (ie) {
2592 pos = skb_put(skb, ie_len);
2593 memcpy(pos, ie, ie_len);
2594 }
2595
2596 return skb;
2597}
2598EXPORT_SYMBOL(ieee80211_probereq_get);
2599
32bfd35d 2600void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2601 const void *frame, size_t frame_len,
e039fa4a 2602 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2603 struct ieee80211_rts *rts)
2604{
2605 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2606
065e9605
HH		 2607 rts->frame_control =
2608 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 2609 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2610 frame_txctl);
e2ebc74d
JB		 2611 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2612 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2613}
2614EXPORT_SYMBOL(ieee80211_rts_get);
2615
32bfd35d 2616void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2617 const void *frame, size_t frame_len,
e039fa4a 2618 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2619 struct ieee80211_cts *cts)
2620{
2621 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2622
065e9605
HH		 2623 cts->frame_control =
2624 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 2625 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2626 frame_len, frame_txctl);
e2ebc74d
JB		 2627 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2628}
2629EXPORT_SYMBOL(ieee80211_ctstoself_get);
2630
2631struct sk_buff *
32bfd35d 2632ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 2633 struct ieee80211_vif *vif)
e2ebc74d
JB		 2634{
2635 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 2636 struct sk_buff *skb = NULL;
5cf121c3 2637 struct ieee80211_tx_data tx;
e2ebc74d
JB		 2638 struct ieee80211_sub_if_data *sdata;
2639 struct ieee80211_if_ap *bss = NULL;
5dfdaf58 2640 struct beacon_data *beacon;
e039fa4a 2641 struct ieee80211_tx_info *info;
e2ebc74d 2642
32bfd35d 2643 sdata = vif_to_sdata(vif);
747cf5e9 2644 bss = &sdata->u.ap;
5dfdaf58 2645
5dfdaf58
JB		 2646 rcu_read_lock();
2647 beacon = rcu_dereference(bss->beacon);
2648
05c914fe 2649 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
747cf5e9 2650 goto out;
5dfdaf58 2651
512119b3 2652 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
747cf5e9 2653 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 2654
e2ebc74d
JB		 2655 while (1) {
2656 skb = skb_dequeue(&bss->ps_bc_buf);
2657 if (!skb)
747cf5e9 2658 goto out;
e2ebc74d
JB		 2659 local->total_ps_buffered--;
2660
2661 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2662 struct ieee80211_hdr *hdr =
2663 (struct ieee80211_hdr *) skb->data;
2664 /* more buffered multicast/broadcast frames ==> set
2665 * MoreData flag in IEEE 802.11 header to inform PS
2666 * STAs */
2667 hdr->frame_control |=
2668 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2669 }
2670
3b8d81e0 2671 if (!ieee80211_tx_prepare(sdata, &tx, skb))
e2ebc74d
JB		 2672 break;
2673 dev_kfree_skb_any(skb);
2674 }
e039fa4a
JB		 2675
2676 info = IEEE80211_SKB_CB(skb);
2677
5cf121c3
JB		 2678 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2679 tx.channel = local->hw.conf.channel;
e039fa4a 2680 info->band = tx.channel->band;
e2ebc74d 2681
97b045d6 2682 if (invoke_tx_handlers(&tx))
e2ebc74d 2683 skb = NULL;
97b045d6 2684 out:
d0709a65 2685 rcu_read_unlock();
e2ebc74d
JB		 2686
2687 return skb;
2688}
2689EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 2690
cf6bb79a
HS		 2691void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
2692 struct sk_buff *skb, int tid)
3b8d81e0 2693{
3b8d81e0
JB		 2694 skb_set_mac_header(skb, 0);
2695 skb_set_network_header(skb, 0);
2696 skb_set_transport_header(skb, 0);
2697
cf6bb79a
HS		 2698 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
2699 skb->priority = tid;
cf0277e7 2700
3d34deb6
JB		 2701 /*
2702 * The other path calling ieee80211_xmit is from the tasklet,
2703 * and while we can handle concurrent transmissions locking
2704 * requirements are that we do not come into tx with bhs on.
2705 */
2706 local_bh_disable();
3b8d81e0 2707 ieee80211_xmit(sdata, skb);
3d34deb6 2708 local_bh_enable();
3b8d81e0 2709}
kernel source for telekom puls (alcatel/mediatek)