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mac80211: fix TX warning
[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 &&
05c914fe 298 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
358c8d9d 299 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d
JB		 300#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
301 printk(KERN_DEBUG "%s: dropped data frame to not "
0c68ae26 302 "associated station %pM\n",
47846c9b 303 tx->sdata->name, hdr->addr1);
e2ebc74d
JB		 304#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
305 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 306 return TX_DROP;
e2ebc74d
JB		 307 }
308 } else {
358c8d9d 309 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
e2ebc74d 310 tx->local->num_sta == 0 &&
05c914fe 311 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
e2ebc74d
JB		 312 /*
313 * No associated STAs - no need to send multicast
314 * frames.
315 */
9ae54c84 316 return TX_DROP;
e2ebc74d 317 }
9ae54c84 318 return TX_CONTINUE;
e2ebc74d
JB		 319 }
320
9ae54c84 321 return TX_CONTINUE;
e2ebc74d
JB		 322}
323
e2ebc74d
JB		 324/* This function is called whenever the AP is about to exceed the maximum limit
325 * of buffered frames for power saving STAs. This situation should not really
326 * happen often during normal operation, so dropping the oldest buffered packet
327 * from each queue should be OK to make some room for new frames. */
328static void purge_old_ps_buffers(struct ieee80211_local *local)
329{
330 int total = 0, purged = 0;
331 struct sk_buff *skb;
332 struct ieee80211_sub_if_data *sdata;
333 struct sta_info *sta;
334
79010420
JB		 335 /*
336 * virtual interfaces are protected by RCU
337 */
338 rcu_read_lock();
339
340 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
e2ebc74d 341 struct ieee80211_if_ap *ap;
05c914fe 342 if (sdata->vif.type != NL80211_IFTYPE_AP)
e2ebc74d
JB		 343 continue;
344 ap = &sdata->u.ap;
345 skb = skb_dequeue(&ap->ps_bc_buf);
346 if (skb) {
347 purged++;
348 dev_kfree_skb(skb);
349 }
350 total += skb_queue_len(&ap->ps_bc_buf);
351 }
e2ebc74d 352
948d887d
JB		 353 /*
354 * Drop one frame from each station from the lowest-priority
355 * AC that has frames at all.
356 */
d0709a65 357 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 358 int ac;
359
360 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
361 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
362 total += skb_queue_len(&sta->ps_tx_buf[ac]);
363 if (skb) {
364 purged++;
365 dev_kfree_skb(skb);
366 break;
367 }
e2ebc74d 368 }
e2ebc74d 369 }
d0709a65
JB		 370
371 rcu_read_unlock();
e2ebc74d
JB		 372
373 local->total_ps_buffered = total;
54223995 374#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0fb9a9ec
JP		 375 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
376 purged);
f4ea83dd 377#endif
e2ebc74d
JB		 378}
379
9ae54c84 380static ieee80211_tx_result
5cf121c3 381ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 382{
e039fa4a 383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 384 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 385
7d54d0dd
JB		 386 /*
387 * broadcast/multicast frame
388 *
389 * If any of the associated stations is in power save mode,
390 * the frame is buffered to be sent after DTIM beacon frame.
391 * This is done either by the hardware or us.
392 */
393
3e122be0
JB		 394 /* powersaving STAs only in AP/VLAN mode */
395 if (!tx->sdata->bss)
396 return TX_CONTINUE;
397
398 /* no buffering for ordered frames */
358c8d9d 399 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 400 return TX_CONTINUE;
7d54d0dd
JB		 401
402 /* no stations in PS mode */
403 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
9ae54c84 404 return TX_CONTINUE;
7d54d0dd 405
62b517cb 406 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
62b1208e 407
62b517cb
JB		 408 /* device releases frame after DTIM beacon */
409 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
62b1208e 410 return TX_CONTINUE;
62b1208e 411
7d54d0dd 412 /* buffered in mac80211 */
62b1208e
JB		 413 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
414 purge_old_ps_buffers(tx->local);
415
416 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
54223995 417#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
62b1208e
JB		 418 if (net_ratelimit())
419 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
47846c9b 420 tx->sdata->name);
f4ea83dd 421#endif
62b1208e
JB		 422 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
423 } else
424 tx->local->total_ps_buffered++;
e2ebc74d 425
62b1208e 426 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
7d54d0dd 427
62b1208e 428 return TX_QUEUED;
e2ebc74d
JB		 429}
430
fb733336
JM		 431static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
432 struct sk_buff *skb)
433{
434 if (!ieee80211_is_mgmt(fc))
435 return 0;
436
c2c98fde 437 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 438 return 0;
439
440 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
441 skb->data))
442 return 0;
443
444 return 1;
445}
446
9ae54c84 447static ieee80211_tx_result
5cf121c3 448ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 449{
450 struct sta_info *sta = tx->sta;
e039fa4a 451 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 453 struct ieee80211_local *local = tx->local;
e2ebc74d 454
f64f9e71
JP		 455 if (unlikely(!sta ||
456 ieee80211_is_probe_resp(hdr->frame_control) ||
457 ieee80211_is_auth(hdr->frame_control) ||
458 ieee80211_is_assoc_resp(hdr->frame_control) ||
459 ieee80211_is_reassoc_resp(hdr->frame_control)))
9ae54c84 460 return TX_CONTINUE;
e2ebc74d 461
c2c98fde
JB		 462 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
463 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
47086fc5 464 !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) {
948d887d
JB		 465 int ac = skb_get_queue_mapping(tx->skb);
466
e2ebc74d 467#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
948d887d
JB		 468 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
469 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d 470#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e2ebc74d
JB		 471 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
472 purge_old_ps_buffers(tx->local);
948d887d
JB		 473 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
474 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
54223995 475#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
948d887d
JB		 476 if (net_ratelimit())
477 printk(KERN_DEBUG "%s: STA %pM TX buffer for "
478 "AC %d full - dropping oldest frame\n",
479 tx->sdata->name, sta->sta.addr, ac);
f4ea83dd 480#endif
e2ebc74d
JB		 481 dev_kfree_skb(old);
482 } else
483 tx->local->total_ps_buffered++;
004c872e 484
e039fa4a 485 info->control.jiffies = jiffies;
5061b0c2 486 info->control.vif = &tx->sdata->vif;
8f77f384 487 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
948d887d 488 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
3393a608
JO		 489
490 if (!timer_pending(&local->sta_cleanup))
491 mod_timer(&local->sta_cleanup,
492 round_jiffies(jiffies +
493 STA_INFO_CLEANUP_INTERVAL));
494
c868cb35
JB		 495 /*
496 * We queued up some frames, so the TIM bit might
497 * need to be set, recalculate it.
498 */
499 sta_info_recalc_tim(sta);
500
9ae54c84 501 return TX_QUEUED;
e2ebc74d
JB		 502 }
503#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
c2c98fde 504 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
47086fc5
JB		 505 printk(KERN_DEBUG
506 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
507 tx->sdata->name, sta->sta.addr);
e2ebc74d
JB		 508 }
509#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e2ebc74d 510
9ae54c84 511 return TX_CONTINUE;
e2ebc74d
JB		 512}
513
d9e8a70f 514static ieee80211_tx_result debug_noinline
5cf121c3 515ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 516{
5cf121c3 517 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 518 return TX_CONTINUE;
e2ebc74d 519
5cf121c3 520 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 521 return ieee80211_tx_h_unicast_ps_buf(tx);
522 else
523 return ieee80211_tx_h_multicast_ps_buf(tx);
524}
525
a621fa4d
JB		 526static ieee80211_tx_result debug_noinline
527ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
528{
529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
530
531 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
532 tx->sdata->control_port_no_encrypt))
533 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
534
535 return TX_CONTINUE;
536}
537
d9e8a70f 538static ieee80211_tx_result debug_noinline
5cf121c3 539ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 540{
d3feaf5a 541 struct ieee80211_key *key = NULL;
e039fa4a 542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 544
3b8d81e0 545 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 546 tx->key = NULL;
e31b8213 547 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
d4e46a3d 548 tx->key = key;
3cfcf6ac 549 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324
JM		 550 is_multicast_ether_addr(hdr->addr1) &&
551 ieee80211_is_robust_mgmt_frame(hdr) &&
3cfcf6ac
JM		 552 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
553 tx->key = key;
f7e0104c
JB		 554 else if (is_multicast_ether_addr(hdr->addr1) &&
555 (key = rcu_dereference(tx->sdata->default_multicast_key)))
556 tx->key = key;
557 else if (!is_multicast_ether_addr(hdr->addr1) &&
558 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 559 tx->key = key;
e2ebc74d 560 else if (tx->sdata->drop_unencrypted &&
a621fa4d 561 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
e0463f50
JM		 562 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
563 (!ieee80211_is_robust_mgmt_frame(hdr) ||
564 (ieee80211_is_action(hdr->frame_control) &&
c2c98fde 565 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
e2ebc74d 566 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
9ae54c84 567 return TX_DROP;
176e4f84 568 } else
e2ebc74d
JB		 569 tx->key = NULL;
570
571 if (tx->key) {
813d7669
JB		 572 bool skip_hw = false;
573
e2ebc74d 574 tx->key->tx_rx_count++;
011bfcc4 575 /* TODO: add threshold stuff again */
176e4f84 576
97359d12
JB		 577 switch (tx->key->conf.cipher) {
578 case WLAN_CIPHER_SUITE_WEP40:
579 case WLAN_CIPHER_SUITE_WEP104:
97359d12 580 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 581 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 582 tx->key = NULL;
583 break;
97359d12 584 case WLAN_CIPHER_SUITE_CCMP:
fb733336
JM		 585 if (!ieee80211_is_data_present(hdr->frame_control) &&
586 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
587 tx->skb))
588 tx->key = NULL;
3b43a187
KV		 589 else
590 skip_hw = (tx->key->conf.flags &
591 IEEE80211_KEY_FLAG_SW_MGMT) &&
592 ieee80211_is_mgmt(hdr->frame_control);
fb733336 593 break;
97359d12 594 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 595 if (!ieee80211_is_mgmt(hdr->frame_control))
596 tx->key = NULL;
597 break;
176e4f84 598 }
813d7669 599
95acac61
JB		 600 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
601 return TX_DROP;
602
f12553eb 603 if (!skip_hw && tx->key &&
382b1655 604 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 605 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 606 }
607
9ae54c84 608 return TX_CONTINUE;
e2ebc74d
JB		 609}
610
d9e8a70f 611static ieee80211_tx_result debug_noinline
5cf121c3 612ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 613{
e039fa4a 614 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 615 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
616 struct ieee80211_supported_band *sband;
617 struct ieee80211_rate *rate;
a2c40249
SZ		 618 int i;
619 u32 len;
e6a9854b
JB		 620 bool inval = false, rts = false, short_preamble = false;
621 struct ieee80211_tx_rate_control txrc;
c2c98fde 622 bool assoc = false;
8318d78a 623
e6a9854b 624 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 625
e6a9854b 626 sband = tx->local->hw.wiphy->bands[tx->channel->band];
58d4185e 627
a2c40249 628 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 629 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 630
631 /* set up the tx rate control struct we give the RC algo */
632 txrc.hw = local_to_hw(tx->local);
633 txrc.sband = sband;
634 txrc.bss_conf = &tx->sdata->vif.bss_conf;
635 txrc.skb = tx->skb;
636 txrc.reported_rate.idx = -1;
37eb0b16
JM		 637 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
638 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
639 txrc.max_rate_idx = -1;
640 else
641 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1
FF		 642 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
643 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
e6a9854b
JB		 644
645 /* set up RTS protection if desired */
b9a5f8ca 646 if (len > tx->local->hw.wiphy->rts_threshold) {
e6a9854b 647 txrc.rts = rts = true;
e2ebc74d 648 }
e2ebc74d 649
e6a9854b
JB		 650 /*
651 * Use short preamble if the BSS can handle it, but not for
652 * management frames unless we know the receiver can handle
653 * that -- the management frame might be to a station that
654 * just wants a probe response.
655 */
656 if (tx->sdata->vif.bss_conf.use_short_preamble &&
657 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 658 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
e6a9854b 659 txrc.short_preamble = short_preamble = true;
e2ebc74d 660
c2c98fde
JB		 661 if (tx->sta)
662 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 663
664 /*
665 * Lets not bother rate control if we're associated and cannot
666 * talk to the sta. This should not happen.
667 */
c2c98fde 668 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 669 !rate_usable_index_exists(sband, &tx->sta->sta),
670 "%s: Dropped data frame as no usable bitrate found while "
671 "scanning and associated. Target station: "
672 "%pM on %d GHz band\n",
47846c9b 673 tx->sdata->name, hdr->addr1,
b770b43e
LR		 674 tx->channel->band ? 5 : 2))
675 return TX_DROP;
2e92e6f2 676
b770b43e
LR		 677 /*
678 * If we're associated with the sta at this point we know we can at
679 * least send the frame at the lowest bit rate.
680 */
e6a9854b
JB		 681 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
682
683 if (unlikely(info->control.rates[0].idx < 0))
684 return TX_DROP;
685
c1ce5a74 686 if (txrc.reported_rate.idx < 0) {
e6a9854b 687 txrc.reported_rate = info->control.rates[0];
c1ce5a74
HS		 688 if (tx->sta && ieee80211_is_data(hdr->frame_control))
689 tx->sta->last_tx_rate = txrc.reported_rate;
690 } else if (tx->sta)
e6a9854b 691 tx->sta->last_tx_rate = txrc.reported_rate;
e039fa4a 692
e6a9854b
JB		 693 if (unlikely(!info->control.rates[0].count))
694 info->control.rates[0].count = 1;
e2ebc74d 695
9955151d
GS		 696 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
697 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
698 info->control.rates[0].count = 1;
699
e6a9854b
JB		 700 if (is_multicast_ether_addr(hdr->addr1)) {
701 /*
702 * XXX: verify the rate is in the basic rateset
703 */
704 return TX_CONTINUE;
e2ebc74d
JB		 705 }
706
e6a9854b
JB		 707 /*
708 * set up the RTS/CTS rate as the fastest basic rate
709 * that is not faster than the data rate
710 *
711 * XXX: Should this check all retry rates?
712 */
713 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
714 s8 baserate = 0;
715
716 rate = &sband->bitrates[info->control.rates[0].idx];
717
718 for (i = 0; i < sband->n_bitrates; i++) {
719 /* must be a basic rate */
720 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
721 continue;
722 /* must not be faster than the data rate */
723 if (sband->bitrates[i].bitrate > rate->bitrate)
724 continue;
725 /* maximum */
726 if (sband->bitrates[baserate].bitrate <
727 sband->bitrates[i].bitrate)
728 baserate = i;
729 }
730
731 info->control.rts_cts_rate_idx = baserate;
7e9ed188
DD		 732 }
733
e6a9854b
JB		 734 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
735 /*
736 * make sure there's no valid rate following
737 * an invalid one, just in case drivers don't
738 * take the API seriously to stop at -1.
739 */
740 if (inval) {
741 info->control.rates[i].idx = -1;
742 continue;
743 }
744 if (info->control.rates[i].idx < 0) {
745 inval = true;
746 continue;
747 }
8318d78a 748
e6a9854b
JB		 749 /*
750 * For now assume MCS is already set up correctly, this
751 * needs to be fixed.
752 */
753 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
754 WARN_ON(info->control.rates[i].idx > 76);
755 continue;
756 }
e2ebc74d 757
e6a9854b
JB		 758 /* set up RTS protection if desired */
759 if (rts)
760 info->control.rates[i].flags |=
761 IEEE80211_TX_RC_USE_RTS_CTS;
8318d78a 762
e6a9854b 763 /* RC is busted */
075cbc9e
S		 764 if (WARN_ON_ONCE(info->control.rates[i].idx >=
765 sband->n_bitrates)) {
e6a9854b
JB		 766 info->control.rates[i].idx = -1;
767 continue;
8318d78a 768 }
e2ebc74d 769
e6a9854b
JB		 770 rate = &sband->bitrates[info->control.rates[i].idx];
771
772 /* set up short preamble */
773 if (short_preamble &&
774 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
775 info->control.rates[i].flags |=
776 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
777
778 /* set up G protection */
779 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
780 rate->flags & IEEE80211_RATE_ERP_G)
781 info->control.rates[i].flags |=
782 IEEE80211_TX_RC_USE_CTS_PROTECT;
e2ebc74d
JB		 783 }
784
e6a9854b
JB		 785 return TX_CONTINUE;
786}
787
f591fa5d
JB		 788static ieee80211_tx_result debug_noinline
789ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
790{
791 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
792 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
793 u16 *seq;
794 u8 *qc;
795 int tid;
796
25d834e1
JB		 797 /*
798 * Packet injection may want to control the sequence
799 * number, if we have no matching interface then we
800 * neither assign one ourselves nor ask the driver to.
801 */
5061b0c2 802 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 803 return TX_CONTINUE;
804
f591fa5d
JB		 805 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
806 return TX_CONTINUE;
807
808 if (ieee80211_hdrlen(hdr->frame_control) < 24)
809 return TX_CONTINUE;
810
49a59543
JB		 811 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
812 return TX_CONTINUE;
813
94778280
JB		 814 /*
815 * Anything but QoS data that has a sequence number field
816 * (is long enough) gets a sequence number from the global
817 * counter.
818 */
f591fa5d 819 if (!ieee80211_is_data_qos(hdr->frame_control)) {
94778280 820 /* driver should assign sequence number */
f591fa5d 821 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 822 /* for pure STA mode without beacons, we can do it */
823 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
824 tx->sdata->sequence_number += 0x10;
f591fa5d
JB		 825 return TX_CONTINUE;
826 }
827
828 /*
829 * This should be true for injected/management frames only, for
830 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
831 * above since they are not QoS-data frames.
832 */
833 if (!tx->sta)
834 return TX_CONTINUE;
835
836 /* include per-STA, per-TID sequence counter */
837
838 qc = ieee80211_get_qos_ctl(hdr);
839 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
840 seq = &tx->sta->tid_seq[tid];
841
842 hdr->seq_ctrl = cpu_to_le16(*seq);
843
844 /* Increase the sequence number. */
845 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
846
847 return TX_CONTINUE;
848}
849
252b86c4 850static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 851 struct sk_buff *skb, int hdrlen,
852 int frag_threshold)
853{
252b86c4 854 struct ieee80211_local *local = tx->local;
a1a3fcec 855 struct ieee80211_tx_info *info;
252b86c4 856 struct sk_buff *tmp;
2de8e0d9
JB		 857 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
858 int pos = hdrlen + per_fragm;
859 int rem = skb->len - hdrlen - per_fragm;
860
861 if (WARN_ON(rem < 0))
862 return -EINVAL;
863
252b86c4
JB		 864 /* first fragment was already added to queue by caller */
865
2de8e0d9
JB		 866 while (rem) {
867 int fraglen = per_fragm;
868
869 if (fraglen > rem)
870 fraglen = rem;
871 rem -= fraglen;
872 tmp = dev_alloc_skb(local->tx_headroom +
873 frag_threshold +
874 IEEE80211_ENCRYPT_HEADROOM +
875 IEEE80211_ENCRYPT_TAILROOM);
876 if (!tmp)
877 return -ENOMEM;
252b86c4
JB		 878
879 __skb_queue_tail(&tx->skbs, tmp);
880
2de8e0d9
JB		 881 skb_reserve(tmp, local->tx_headroom +
882 IEEE80211_ENCRYPT_HEADROOM);
883 /* copy control information */
884 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 885
886 info = IEEE80211_SKB_CB(tmp);
887 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
888 IEEE80211_TX_CTL_FIRST_FRAGMENT);
889
890 if (rem)
891 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
892
2de8e0d9
JB		 893 skb_copy_queue_mapping(tmp, skb);
894 tmp->priority = skb->priority;
2de8e0d9 895 tmp->dev = skb->dev;
2de8e0d9
JB		 896
897 /* copy header and data */
898 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
899 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
900
901 pos += fraglen;
902 }
903
252b86c4 904 /* adjust first fragment's length */
2de8e0d9
JB		 905 skb->len = hdrlen + per_fragm;
906 return 0;
907}
908
d9e8a70f 909static ieee80211_tx_result debug_noinline
e2454948
JB		 910ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
911{
2de8e0d9
JB		 912 struct sk_buff *skb = tx->skb;
913 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
914 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 915 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 916 int hdrlen;
917 int fragnum;
e2454948 918
252b86c4
JB		 919 /* no matter what happens, tx->skb moves to tx->skbs */
920 __skb_queue_tail(&tx->skbs, skb);
921 tx->skb = NULL;
922
a26eb27a
JB		 923 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
924 return TX_CONTINUE;
925
926 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 927 return TX_CONTINUE;
928
eefce91a
JB		 929 /*
930 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 931 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 932 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 933 */
8b30b1fe 934 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 935 return TX_DROP;
936
065e9605 937 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 938
a26eb27a 939 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 940 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 941 return TX_DROP;
e6a9854b 942
2de8e0d9
JB		 943 /*
944 * Now fragment the frame. This will allocate all the fragments and
945 * chain them (using skb as the first fragment) to skb->next.
946 * During transmission, we will remove the successfully transmitted
947 * fragments from this list. When the low-level driver rejects one
948 * of the fragments then we will simply pretend to accept the skb
949 * but store it away as pending.
950 */
252b86c4 951 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 952 return TX_DROP;
e6a9854b 953
2de8e0d9
JB		 954 /* update duration/seq/flags of fragments */
955 fragnum = 0;
252b86c4
JB		 956
957 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9
JB		 958 int next_len;
959 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 960
2de8e0d9
JB		 961 hdr = (void *)skb->data;
962 info = IEEE80211_SKB_CB(skb);
e6a9854b 963
252b86c4 964 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 965 hdr->frame_control |= morefrags;
e6a9854b
JB		 966 /*
967 * No multi-rate retries for fragmented frames, that
968 * would completely throw off the NAV at other STAs.
969 */
970 info->control.rates[1].idx = -1;
971 info->control.rates[2].idx = -1;
972 info->control.rates[3].idx = -1;
973 info->control.rates[4].idx = -1;
974 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
975 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 976 } else {
977 hdr->frame_control &= ~morefrags;
978 next_len = 0;
e6a9854b 979 }
2de8e0d9
JB		 980 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
981 fragnum++;
252b86c4 982 }
e2ebc74d 983
9ae54c84 984 return TX_CONTINUE;
e2ebc74d
JB		 985}
986
feff1f2f
JB		 987static ieee80211_tx_result debug_noinline
988ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
989{
252b86c4 990 struct sk_buff *skb;
feff1f2f
JB		 991
992 if (!tx->sta)
993 return TX_CONTINUE;
994
995 tx->sta->tx_packets++;
252b86c4 996 skb_queue_walk(&tx->skbs, skb) {
feff1f2f
JB		 997 tx->sta->tx_fragments++;
998 tx->sta->tx_bytes += skb->len;
252b86c4 999 }
feff1f2f
JB		 1000
1001 return TX_CONTINUE;
1002}
1003
d9e8a70f 1004static ieee80211_tx_result debug_noinline
e2454948
JB		 1005ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1006{
3ffc2a90
JB		 1007 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1008
e2454948
JB		 1009 if (!tx->key)
1010 return TX_CONTINUE;
1011
97359d12
JB		 1012 switch (tx->key->conf.cipher) {
1013 case WLAN_CIPHER_SUITE_WEP40:
1014 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1015 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1016 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1017 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1018 case WLAN_CIPHER_SUITE_CCMP:
e2454948 1019 return ieee80211_crypto_ccmp_encrypt(tx);
97359d12 1020 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1021 return ieee80211_crypto_aes_cmac_encrypt(tx);
3ffc2a90
JB		 1022 default:
1023 /* handle hw-only algorithm */
1024 if (info->control.hw_key) {
1025 ieee80211_tx_set_protected(tx);
1026 return TX_CONTINUE;
1027 }
1028 break;
1029
e2454948
JB		 1030 }
1031
e2454948
JB		 1032 return TX_DROP;
1033}
1034
d9e8a70f 1035static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1036ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1037{
252b86c4 1038 struct sk_buff *skb;
2de8e0d9
JB		 1039 struct ieee80211_hdr *hdr;
1040 int next_len;
1041 bool group_addr;
03f93c3d 1042
252b86c4 1043 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1044 hdr = (void *) skb->data;
7e0aae47
JM		 1045 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1046 break; /* must not overwrite AID */
252b86c4
JB		 1047 if (!skb_queue_is_last(&tx->skbs, skb)) {
1048 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1049 next_len = next->len;
1050 } else
1051 next_len = 0;
2de8e0d9 1052 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1053
2de8e0d9 1054 hdr->duration_id =
252b86c4
JB		 1055 ieee80211_duration(tx, skb, group_addr, next_len);
1056 }
03f93c3d
JB		 1057
1058 return TX_CONTINUE;
1059}
1060
e2ebc74d
JB		 1061/* actual transmit path */
1062
a622ab72
JB		 1063static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1064 struct sk_buff *skb,
1065 struct ieee80211_tx_info *info,
1066 struct tid_ampdu_tx *tid_tx,
1067 int tid)
1068{
1069 bool queued = false;
285fa695 1070 bool reset_agg_timer = false;
a622ab72
JB		 1071
1072 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1073 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1074 reset_agg_timer = true;
0ab33703
JB		 1075 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1076 /*
1077 * nothing -- this aggregation session is being started
1078 * but that might still fail with the driver
1079 */
a622ab72
JB		 1080 } else {
1081 spin_lock(&tx->sta->lock);
1082 /*
1083 * Need to re-check now, because we may get here
1084 *
1085 * 1) in the window during which the setup is actually
1086 * already done, but not marked yet because not all
1087 * packets are spliced over to the driver pending
1088 * queue yet -- if this happened we acquire the lock
1089 * either before or after the splice happens, but
1090 * need to recheck which of these cases happened.
1091 *
1092 * 2) during session teardown, if the OPERATIONAL bit
1093 * was cleared due to the teardown but the pointer
1094 * hasn't been assigned NULL yet (or we loaded it
1095 * before it was assigned) -- in this case it may
1096 * now be NULL which means we should just let the
1097 * packet pass through because splicing the frames
1098 * back is already done.
1099 */
40b275b6 1100 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1101
1102 if (!tid_tx) {
1103 /* do nothing, let packet pass through */
1104 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1105 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1106 reset_agg_timer = true;
a622ab72
JB		 1107 } else {
1108 queued = true;
1109 info->control.vif = &tx->sdata->vif;
1110 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1111 __skb_queue_tail(&tid_tx->pending, skb);
1112 }
1113 spin_unlock(&tx->sta->lock);
1114 }
1115
285fa695
NM		 1116 /* reset session timer */
1117 if (reset_agg_timer && tid_tx->timeout)
1118 mod_timer(&tid_tx->session_timer,
1119 TU_TO_EXP_TIME(tid_tx->timeout));
1120
a622ab72
JB		 1121 return queued;
1122}
1123
58d4185e
JB		 1124/*
1125 * initialises @tx
1126 */
9ae54c84 1127static ieee80211_tx_result
3b8d81e0
JB		 1128ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1129 struct ieee80211_tx_data *tx,
1130 struct sk_buff *skb)
e2ebc74d 1131{
3b8d81e0 1132 struct ieee80211_local *local = sdata->local;
58d4185e 1133 struct ieee80211_hdr *hdr;
e039fa4a 1134 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1135 int tid;
a622ab72 1136 u8 *qc;
e2ebc74d
JB		 1137
1138 memset(tx, 0, sizeof(*tx));
1139 tx->skb = skb;
e2ebc74d 1140 tx->local = local;
3b8d81e0 1141 tx->sdata = sdata;
e039fa4a 1142 tx->channel = local->hw.conf.channel;
252b86c4 1143 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1144
cd8ffc80
JB		 1145 /*
1146 * If this flag is set to true anywhere, and we get here,
1147 * we are doing the needed processing, so remove the flag
1148 * now.
1149 */
1150 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1151
58d4185e
JB		 1152 hdr = (struct ieee80211_hdr *) skb->data;
1153
3f0e0b22 1154 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
f14543ee 1155 tx->sta = rcu_dereference(sdata->u.vlan.sta);
3f0e0b22
FF		 1156 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1157 return TX_DROP;
b4d57adb
FF		 1158 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1159 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
3f0e0b22 1160 }
f14543ee 1161 if (!tx->sta)
abe60632 1162 tx->sta = sta_info_get(sdata, hdr->addr1);
58d4185e 1163
cd8ffc80 1164 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1165 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
edf6b784
AN		 1166 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1167 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1168 struct tid_ampdu_tx *tid_tx;
1169
8b30b1fe
S		 1170 qc = ieee80211_get_qos_ctl(hdr);
1171 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1172
a622ab72
JB		 1173 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1174 if (tid_tx) {
1175 bool queued;
cd8ffc80 1176
a622ab72
JB		 1177 queued = ieee80211_tx_prep_agg(tx, skb, info,
1178 tid_tx, tid);
1179
1180 if (unlikely(queued))
1181 return TX_QUEUED;
1182 }
8b30b1fe
S		 1183 }
1184
badffb72 1185 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1186 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1187 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1188 } else
5cf121c3 1189 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1190
a26eb27a
JB		 1191 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1192 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1193 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1194 info->flags & IEEE80211_TX_CTL_AMPDU)
1195 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1196 }
1197
e2ebc74d 1198 if (!tx->sta)
e039fa4a 1199 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
c2c98fde 1200 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
e039fa4a 1201 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
58d4185e 1202
e039fa4a 1203 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1204
9ae54c84 1205 return TX_CONTINUE;
e2ebc74d
JB		 1206}
1207
11127e91
JB		 1208static bool ieee80211_tx_frags(struct ieee80211_local *local,
1209 struct ieee80211_vif *vif,
1210 struct ieee80211_sta *sta,
1211 struct sk_buff_head *skbs,
1212 bool txpending)
e2ebc74d 1213{
252b86c4 1214 struct sk_buff *skb, *tmp;
f8e79ddd 1215 struct ieee80211_tx_info *info;
3b8d81e0 1216 unsigned long flags;
e2ebc74d 1217
252b86c4 1218 skb_queue_walk_safe(skbs, skb, tmp) {
3b8d81e0
JB		 1219 int q = skb_get_queue_mapping(skb);
1220
1221 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1222 if (local->queue_stop_reasons[q] ||
7bb45683
JB		 1223 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1224 /*
1225 * Since queue is stopped, queue up frames for later
1226 * transmission from the tx-pending tasklet when the
1227 * queue is woken again.
1228 */
252b86c4 1229 if (txpending)
4db4e0a1 1230 skb_queue_splice_init(skbs, &local->pending[q]);
252b86c4 1231 else
4db4e0a1
JB		 1232 skb_queue_splice_tail_init(skbs,
1233 &local->pending[q]);
7bb45683
JB		 1234
1235 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1236 flags);
1237 return false;
1238 }
3b8d81e0 1239 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1240
f0e72851 1241 info = IEEE80211_SKB_CB(skb);
11127e91
JB		 1242 info->control.vif = vif;
1243 info->control.sta = sta;
f0e72851 1244
11127e91
JB		 1245 __skb_unlink(skb, skbs);
1246 drv_tx(local, skb);
1247 }
5061b0c2 1248
11127e91
JB		 1249 return true;
1250}
1251
1252/*
1253 * Returns false if the frame couldn't be transmitted but was queued instead.
1254 */
1255static bool __ieee80211_tx(struct ieee80211_local *local,
1256 struct sk_buff_head *skbs, int led_len,
1257 struct sta_info *sta, bool txpending)
1258{
1259 struct ieee80211_tx_info *info;
1260 struct ieee80211_sub_if_data *sdata;
1261 struct ieee80211_vif *vif;
1262 struct ieee80211_sta *pubsta;
1263 struct sk_buff *skb;
1264 bool result = true;
1265 __le16 fc;
5061b0c2 1266
11127e91
JB		 1267 if (WARN_ON(skb_queue_empty(skbs)))
1268 return true;
ec25acc4 1269
11127e91
JB		 1270 skb = skb_peek(skbs);
1271 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1272 info = IEEE80211_SKB_CB(skb);
1273 sdata = vif_to_sdata(info->control.vif);
1274 if (sta && !sta->uploaded)
1275 sta = NULL;
1276
1277 if (sta)
1278 pubsta = &sta->sta;
1279 else
1280 pubsta = NULL;
1281
1282 switch (sdata->vif.type) {
1283 case NL80211_IFTYPE_MONITOR:
1284 sdata = NULL;
1285 vif = NULL;
1286 break;
1287 case NL80211_IFTYPE_AP_VLAN:
1288 sdata = container_of(sdata->bss,
1289 struct ieee80211_sub_if_data, u.ap);
1290 /* fall through */
1291 default:
1292 vif = &sdata->vif;
1293 break;
e2ebc74d 1294 }
2de8e0d9 1295
11127e91
JB		 1296 if (local->ops->tx_frags)
1297 drv_tx_frags(local, vif, pubsta, skbs);
1298 else
1299 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1300 txpending);
1301
74e4dbfd
JB		 1302 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1303 ieee80211_led_tx(local, 1);
1304
4db4e0a1 1305 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1306
11127e91 1307 return result;
e2ebc74d
JB		 1308}
1309
97b045d6
JB		 1310/*
1311 * Invoke TX handlers, return 0 on success and non-zero if the
1312 * frame was dropped or queued.
1313 */
1314static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1315{
252b86c4 1316 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1317 ieee80211_tx_result res = TX_DROP;
97b045d6 1318
9aa4aee3
JB		 1319#define CALL_TXH(txh) \
1320 do { \
1321 res = txh(tx); \
1322 if (res != TX_CONTINUE) \
1323 goto txh_done; \
1324 } while (0)
1325
5c1b98a5 1326 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1327 CALL_TXH(ieee80211_tx_h_check_assoc);
1328 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1329 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1330 CALL_TXH(ieee80211_tx_h_select_key);
af65cd96
JB		 1331 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1332 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc
JB		 1333
1334 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1335 goto txh_done;
1336
1337 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1338 CALL_TXH(ieee80211_tx_h_sequence);
1339 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1340 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1341 CALL_TXH(ieee80211_tx_h_stats);
1342 CALL_TXH(ieee80211_tx_h_encrypt);
8fd369ee
AN		 1343 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1344 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1345#undef CALL_TXH
97b045d6 1346
d9e8a70f 1347 txh_done:
97b045d6 1348 if (unlikely(res == TX_DROP)) {
5479d0e7 1349 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4
JB		 1350 if (tx->skb)
1351 dev_kfree_skb(tx->skb);
1352 else
1353 __skb_queue_purge(&tx->skbs);
97b045d6
JB		 1354 return -1;
1355 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1356 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1357 return -1;
1358 }
1359
1360 return 0;
1361}
1362
7bb45683
JB		 1363/*
1364 * Returns false if the frame couldn't be transmitted but was queued instead.
1365 */
1366static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
3b8d81e0 1367 struct sk_buff *skb, bool txpending)
e2ebc74d 1368{
3b8d81e0 1369 struct ieee80211_local *local = sdata->local;
5cf121c3 1370 struct ieee80211_tx_data tx;
97b045d6 1371 ieee80211_tx_result res_prepare;
e039fa4a 1372 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1373 bool result = true;
74e4dbfd 1374 int led_len;
e2ebc74d 1375
e2ebc74d
JB		 1376 if (unlikely(skb->len < 10)) {
1377 dev_kfree_skb(skb);
7bb45683 1378 return true;
e2ebc74d
JB		 1379 }
1380
d0709a65
JB		 1381 rcu_read_lock();
1382
58d4185e 1383 /* initialises tx */
74e4dbfd 1384 led_len = skb->len;
3b8d81e0 1385 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
e2ebc74d 1386
cd8ffc80 1387 if (unlikely(res_prepare == TX_DROP)) {
e2ebc74d 1388 dev_kfree_skb(skb);
7bb45683 1389 goto out;
cd8ffc80 1390 } else if (unlikely(res_prepare == TX_QUEUED)) {
7bb45683 1391 goto out;
e2ebc74d
JB		 1392 }
1393
5cf121c3 1394 tx.channel = local->hw.conf.channel;
e039fa4a 1395 info->band = tx.channel->band;
e2ebc74d 1396
7bb45683 1397 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1398 result = __ieee80211_tx(local, &tx.skbs, led_len,
1399 tx.sta, txpending);
97b045d6 1400 out:
d4e46a3d 1401 rcu_read_unlock();
7bb45683 1402 return result;
e2ebc74d
JB		 1403}
1404
1405/* device xmit handlers */
1406
3bff1865 1407static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1408 struct sk_buff *skb,
1409 int head_need, bool may_encrypt)
1410{
3bff1865 1411 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1412 int tail_need = 0;
1413
3bff1865 1414 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1415 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1416 tail_need -= skb_tailroom(skb);
1417 tail_need = max_t(int, tail_need, 0);
1418 }
1419
fc7c976d 1420 if (skb_cloned(skb))
23c0752a 1421 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1422 else if (head_need || tail_need)
23c0752a 1423 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1424 else
1425 return 0;
23c0752a
JB		 1426
1427 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1428 wiphy_debug(local->hw.wiphy,
1429 "failed to reallocate TX buffer\n");
23c0752a
JB		 1430 return -ENOMEM;
1431 }
1432
23c0752a
JB		 1433 return 0;
1434}
1435
ce662b44 1436void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
e2ebc74d 1437{
3b8d81e0 1438 struct ieee80211_local *local = sdata->local;
e039fa4a 1439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1441 int headroom;
23c0752a 1442 bool may_encrypt;
e2ebc74d 1443
d84f3234
JB		 1444 rcu_read_lock();
1445
3b8d81e0 1446 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1447
3b8d81e0 1448 headroom = local->tx_headroom;
23c0752a
JB		 1449 if (may_encrypt)
1450 headroom += IEEE80211_ENCRYPT_HEADROOM;
1451 headroom -= skb_headroom(skb);
1452 headroom = max_t(int, 0, headroom);
1453
3bff1865 1454 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
23c0752a 1455 dev_kfree_skb(skb);
d84f3234 1456 rcu_read_unlock();
3b8d81e0 1457 return;
e2ebc74d
JB		 1458 }
1459
740c1aa3 1460 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1461 info->control.vif = &sdata->vif;
e2ebc74d 1462
cca89496
JC		 1463 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1464 ieee80211_is_data(hdr->frame_control) &&
1465 !is_multicast_ether_addr(hdr->addr1))
1466 if (mesh_nexthop_lookup(skb, sdata)) {
1467 /* skb queued: don't free */
d84f3234 1468 rcu_read_unlock();
cca89496
JC		 1469 return;
1470 }
1471
2154c81c 1472 ieee80211_set_qos_hdr(sdata, skb);
3b8d81e0 1473 ieee80211_tx(sdata, skb, false);
d84f3234 1474 rcu_read_unlock();
e2ebc74d
JB		 1475}
1476
73b9f03a
JB		 1477static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1478{
1479 struct ieee80211_radiotap_iterator iterator;
1480 struct ieee80211_radiotap_header *rthdr =
1481 (struct ieee80211_radiotap_header *) skb->data;
1482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1483 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1484 NULL);
1485 u16 txflags;
1486
1487 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1488 IEEE80211_TX_CTL_DONTFRAG;
1489
1490 /*
1491 * for every radiotap entry that is present
1492 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1493 * entries present, or -EINVAL on error)
1494 */
1495
1496 while (!ret) {
1497 ret = ieee80211_radiotap_iterator_next(&iterator);
1498
1499 if (ret)
1500 continue;
1501
1502 /* see if this argument is something we can use */
1503 switch (iterator.this_arg_index) {
1504 /*
1505 * You must take care when dereferencing iterator.this_arg
1506 * for multibyte types... the pointer is not aligned. Use
1507 * get_unaligned((type *)iterator.this_arg) to dereference
1508 * iterator.this_arg for type "type" safely on all arches.
1509 */
1510 case IEEE80211_RADIOTAP_FLAGS:
1511 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1512 /*
1513 * this indicates that the skb we have been
1514 * handed has the 32-bit FCS CRC at the end...
1515 * we should react to that by snipping it off
1516 * because it will be recomputed and added
1517 * on transmission
1518 */
1519 if (skb->len < (iterator._max_length + FCS_LEN))
1520 return false;
1521
1522 skb_trim(skb, skb->len - FCS_LEN);
1523 }
1524 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1525 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1526 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1527 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1528 break;
1529
1530 case IEEE80211_RADIOTAP_TX_FLAGS:
1531 txflags = get_unaligned_le16(iterator.this_arg);
1532 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1533 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1534 break;
1535
1536 /*
1537 * Please update the file
1538 * Documentation/networking/mac80211-injection.txt
1539 * when parsing new fields here.
1540 */
1541
1542 default:
1543 break;
1544 }
1545 }
1546
1547 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1548 return false;
1549
1550 /*
1551 * remove the radiotap header
1552 * iterator->_max_length was sanity-checked against
1553 * skb->len by iterator init
1554 */
1555 skb_pull(skb, iterator._max_length);
1556
1557 return true;
1558}
1559
d0cf9c0d
SH		 1560netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1561 struct net_device *dev)
e2ebc74d
JB		 1562{
1563 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
47f4d887 1564 struct ieee80211_channel *chan = local->hw.conf.channel;
e2ebc74d
JB		 1565 struct ieee80211_radiotap_header *prthdr =
1566 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1568 struct ieee80211_hdr *hdr;
5d9cf4a5 1569 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
9b8a74e3 1570 u16 len_rthdr;
5d9cf4a5 1571 int hdrlen;
e2ebc74d 1572
47f4d887
LR		 1573 /*
1574 * Frame injection is not allowed if beaconing is not allowed
1575 * or if we need radar detection. Beaconing is usually not allowed when
1576 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1577 * Passive scan is also used in world regulatory domains where
1578 * your country is not known and as such it should be treated as
1579 * NO TX unless the channel is explicitly allowed in which case
1580 * your current regulatory domain would not have the passive scan
1581 * flag.
1582 *
1583 * Since AP mode uses monitor interfaces to inject/TX management
1584 * frames we can make AP mode the exception to this rule once it
1585 * supports radar detection as its implementation can deal with
1586 * radar detection by itself. We can do that later by adding a
1587 * monitor flag interfaces used for AP support.
1588 */
1589 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1590 IEEE80211_CHAN_PASSIVE_SCAN)))
1591 goto fail;
1592
9b8a74e3
AG		 1593 /* check for not even having the fixed radiotap header part */
1594 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1595 goto fail; /* too short to be possibly valid */
1596
1597 /* is it a header version we can trust to find length from? */
1598 if (unlikely(prthdr->it_version))
1599 goto fail; /* only version 0 is supported */
1600
1601 /* then there must be a radiotap header with a length we can use */
1602 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1603
1604 /* does the skb contain enough to deliver on the alleged length? */
1605 if (unlikely(skb->len < len_rthdr))
1606 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1607
e2ebc74d
JB		 1608 /*
1609 * fix up the pointers accounting for the radiotap
1610 * header still being in there. We are being given
1611 * a precooked IEEE80211 header so no need for
1612 * normal processing
1613 */
9b8a74e3 1614 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1615 /*
9b8a74e3
AG		 1616 * these are just fixed to the end of the rt area since we
1617 * don't have any better information and at this point, nobody cares
e2ebc74d 1618 */
9b8a74e3
AG		 1619 skb_set_network_header(skb, len_rthdr);
1620 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1621
5d9cf4a5
JB		 1622 if (skb->len < len_rthdr + 2)
1623 goto fail;
1624
1625 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1626 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1627
1628 if (skb->len < len_rthdr + hdrlen)
1629 goto fail;
1630
f75f5c6f
HS		 1631 /*
1632 * Initialize skb->protocol if the injected frame is a data frame
1633 * carrying a rfc1042 header
1634 */
5d9cf4a5
JB		 1635 if (ieee80211_is_data(hdr->frame_control) &&
1636 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1637 u8 *payload = (u8 *)hdr + hdrlen;
1638
1639 if (compare_ether_addr(payload, rfc1042_header) == 0)
1640 skb->protocol = cpu_to_be16((payload[6] << 8) |
1641 payload[7]);
f75f5c6f
HS		 1642 }
1643
3b8d81e0
JB		 1644 memset(info, 0, sizeof(*info));
1645
5d9cf4a5 1646 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1647 IEEE80211_TX_CTL_INJECTED;
1648
1649 /* process and remove the injection radiotap header */
1650 if (!ieee80211_parse_tx_radiotap(skb))
1651 goto fail;
5d9cf4a5
JB		 1652
1653 rcu_read_lock();
1654
1655 /*
1656 * We process outgoing injected frames that have a local address
1657 * we handle as though they are non-injected frames.
1658 * This code here isn't entirely correct, the local MAC address
1659 * isn't always enough to find the interface to use; for proper
1660 * VLAN/WDS support we will need a different mechanism (which
1661 * likely isn't going to be monitor interfaces).
1662 */
1663 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1664
1665 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1666 if (!ieee80211_sdata_running(tmp_sdata))
1667 continue;
1668 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1669 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1670 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1671 continue;
1672 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
1673 sdata = tmp_sdata;
1674 break;
1675 }
1676 }
7351c6bd 1677
5d9cf4a5
JB		 1678 ieee80211_xmit(sdata, skb);
1679 rcu_read_unlock();
1680
e2ebc74d 1681 return NETDEV_TX_OK;
9b8a74e3
AG		 1682
1683fail:
1684 dev_kfree_skb(skb);
1685 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1686}
1687
1688/**
1689 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1690 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1691 * @skb: packet to be sent
1692 * @dev: incoming interface
1693 *
1694 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1695 * not be freed, and caller is responsible for either retrying later or freeing
1696 * skb).
1697 *
1698 * This function takes in an Ethernet header and encapsulates it with suitable
1699 * IEEE 802.11 header based on which interface the packet is coming in. The
1700 * encapsulated packet will then be passed to master interface, wlan#.11, for
1701 * transmission (through low-level driver).
1702 */
d0cf9c0d
SH		 1703netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1704 struct net_device *dev)
e2ebc74d 1705{
133b8226
JB		 1706 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1707 struct ieee80211_local *local = sdata->local;
489ee919 1708 struct ieee80211_tx_info *info;
5b548140 1709 int ret = NETDEV_TX_BUSY, head_need;
065e9605
HH		 1710 u16 ethertype, hdrlen, meshhdrlen = 0;
1711 __le16 fc;
e2ebc74d 1712 struct ieee80211_hdr hdr;
ff67bb86 1713 struct ieee80211s_hdr mesh_hdr __maybe_unused;
0a65169b 1714 struct mesh_path __maybe_unused *mppath = NULL;
e2ebc74d
JB		 1715 const u8 *encaps_data;
1716 int encaps_len, skip_header_bytes;
e8bf9649 1717 int nh_pos, h_pos;
f14543ee 1718 struct sta_info *sta = NULL;
c2c98fde 1719 bool wme_sta = false, authorized = false, tdls_auth = false;
941c93cd 1720 bool tdls_direct = false;
a729cff8
JB		 1721 bool multicast;
1722 u32 info_flags = 0;
1723 u16 info_id = 0;
e2ebc74d 1724
e2ebc74d 1725 if (unlikely(skb->len < ETH_HLEN)) {
ec634fe3 1726 ret = NETDEV_TX_OK;
e2ebc74d
JB		 1727 goto fail;
1728 }
1729
e2ebc74d
JB		 1730 /* convert Ethernet header to proper 802.11 header (based on
1731 * operation mode) */
1732 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 1733 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 1734
51fb61e7 1735 switch (sdata->vif.type) {
05c914fe 1736 case NL80211_IFTYPE_AP_VLAN:
f14543ee 1737 rcu_read_lock();
9bc383de 1738 sta = rcu_dereference(sdata->u.vlan.sta);
f14543ee
FF		 1739 if (sta) {
1740 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1741 /* RA TA DA SA */
1742 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 1743 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1744 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1745 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1746 hdrlen = 30;
c2c98fde
JB		 1747 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1748 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
f14543ee
FF		 1749 }
1750 rcu_read_unlock();
1751 if (sta)
1752 break;
1753 /* fall through */
1754 case NL80211_IFTYPE_AP:
065e9605 1755 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 1756 /* DA BSSID SA */
1757 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 1758 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1759 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1760 hdrlen = 24;
cf966838 1761 break;
05c914fe 1762 case NL80211_IFTYPE_WDS:
065e9605 1763 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 1764 /* RA TA DA SA */
1765 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 1766 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1767 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1768 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1769 hdrlen = 30;
cf966838 1770 break;
33b64eb2 1771#ifdef CONFIG_MAC80211_MESH
05c914fe 1772 case NL80211_IFTYPE_MESH_POINT:
472dbc45 1773 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
e32f85f7 1774 /* Do not send frames with mesh_ttl == 0 */
472dbc45 1775 sdata->u.mesh.mshstats.dropped_frames_ttl++;
ec634fe3 1776 ret = NETDEV_TX_OK;
e32f85f7 1777 goto fail;
33b64eb2 1778 }
28104cae 1779 rcu_read_lock();
f76b57b4
JF		 1780 if (!is_multicast_ether_addr(skb->data))
1781 mppath = mpp_path_lookup(skb->data, sdata);
79617dee 1782
f76b57b4 1783 /*
9d52501b
JF		 1784 * Use address extension if it is a packet from
1785 * another interface or if we know the destination
1786 * is being proxied by a portal (i.e. portal address
1787 * differs from proxied address)
f76b57b4 1788 */
47846c9b 1789 if (compare_ether_addr(sdata->vif.addr,
f76b57b4 1790 skb->data + ETH_ALEN) == 0 &&
9d52501b 1791 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
3c5772a5
JC		 1792 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1793 skb->data, skb->data + ETH_ALEN);
28104cae 1794 rcu_read_unlock();
3c5772a5 1795 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
61ad5394 1796 sdata, NULL, NULL);
79617dee 1797 } else {
3c5772a5 1798 int is_mesh_mcast = 1;
15ff6365 1799 const u8 *mesh_da;
79617dee 1800
79617dee 1801 if (is_multicast_ether_addr(skb->data))
3c5772a5
JC		 1802 /* DA TA mSA AE:SA */
1803 mesh_da = skb->data;
79617dee 1804 else {
15ff6365
JB		 1805 static const u8 bcast[ETH_ALEN] =
1806 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
3c5772a5
JC		 1807 if (mppath) {
1808 /* RA TA mDA mSA AE:DA SA */
1809 mesh_da = mppath->mpp;
1810 is_mesh_mcast = 0;
15ff6365 1811 } else {
3c5772a5 1812 /* DA TA mSA AE:SA */
15ff6365
JB		 1813 mesh_da = bcast;
1814 }
79617dee 1815 }
3c5772a5 1816 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 1817 mesh_da, sdata->vif.addr);
3c5772a5
JC		 1818 rcu_read_unlock();
1819 if (is_mesh_mcast)
1820 meshhdrlen =
1821 ieee80211_new_mesh_header(&mesh_hdr,
1822 sdata,
1823 skb->data + ETH_ALEN,
3c5772a5
JC		 1824 NULL);
1825 else
1826 meshhdrlen =
1827 ieee80211_new_mesh_header(&mesh_hdr,
1828 sdata,
3c5772a5
JC		 1829 skb->data,
1830 skb->data + ETH_ALEN);
79617dee 1831
79617dee 1832 }
33b64eb2
LCC		 1833 break;
1834#endif
05c914fe 1835 case NL80211_IFTYPE_STATION:
941c93cd 1836 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
c2c98fde
JB		 1837 bool tdls_peer = false;
1838
941c93cd
AN		 1839 rcu_read_lock();
1840 sta = sta_info_get(sdata, skb->data);
c2c98fde
JB		 1841 if (sta) {
1842 authorized = test_sta_flag(sta,
1843 WLAN_STA_AUTHORIZED);
1844 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1845 tdls_peer = test_sta_flag(sta,
1846 WLAN_STA_TDLS_PEER);
1847 tdls_auth = test_sta_flag(sta,
1848 WLAN_STA_TDLS_PEER_AUTH);
1849 }
941c93cd
AN		 1850 rcu_read_unlock();
1851
1852 /*
1853 * If the TDLS link is enabled, send everything
1854 * directly. Otherwise, allow TDLS setup frames
1855 * to be transmitted indirectly.
1856 */
c2c98fde 1857 tdls_direct = tdls_peer && (tdls_auth ||
941c93cd
AN		 1858 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1859 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1860 }
1861
1862 if (tdls_direct) {
1863 /* link during setup - throw out frames to peer */
c2c98fde 1864 if (!tdls_auth) {
941c93cd
AN		 1865 ret = NETDEV_TX_OK;
1866 goto fail;
1867 }
1868
1869 /* DA SA BSSID */
1870 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1871 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1872 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1873 hdrlen = 24;
1874 } else if (sdata->u.mgd.use_4addr &&
1875 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1876 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1877 IEEE80211_FCTL_TODS);
f14543ee 1878 /* RA TA DA SA */
941c93cd 1879 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 1880 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1881 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1882 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1883 hdrlen = 30;
1884 } else {
1885 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1886 /* BSSID SA DA */
941c93cd 1887 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 1888 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1889 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1890 hdrlen = 24;
1891 }
cf966838 1892 break;
05c914fe 1893 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 1894 /* DA SA BSSID */
1895 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1896 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 1897 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 1898 hdrlen = 24;
cf966838
JB		 1899 break;
1900 default:
ec634fe3 1901 ret = NETDEV_TX_OK;
e2ebc74d
JB		 1902 goto fail;
1903 }
1904
7d185b8b
JB		 1905 /*
1906 * There's no need to try to look up the destination
1907 * if it is a multicast address (which can only happen
1908 * in AP mode)
1909 */
a729cff8
JB		 1910 multicast = is_multicast_ether_addr(hdr.addr1);
1911 if (!multicast) {
d0709a65 1912 rcu_read_lock();
abe60632 1913 sta = sta_info_get(sdata, hdr.addr1);
c2c98fde
JB		 1914 if (sta) {
1915 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1916 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1917 }
d0709a65 1918 rcu_read_unlock();
e2ebc74d
JB		 1919 }
1920
4777be41
JC		 1921 /* For mesh, the use of the QoS header is mandatory */
1922 if (ieee80211_vif_is_mesh(&sdata->vif))
c2c98fde 1923 wme_sta = true;
4777be41 1924
3434fbd3 1925 /* receiver and we are QoS enabled, use a QoS type frame */
c2c98fde 1926 if (wme_sta && local->hw.queues >= 4) {
065e9605 1927 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 1928 hdrlen += 2;
1929 }
1930
1931 /*
238814fd
JB		 1932 * Drop unicast frames to unauthorised stations unless they are
1933 * EAPOL frames from the local station.
ce3edf6d 1934 */
55182e4a
JB		 1935 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1936 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1937 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1938 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 1939#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
ce3edf6d 1940 if (net_ratelimit())
0c68ae26 1941 printk(KERN_DEBUG "%s: dropped frame to %pM"
ce3edf6d 1942 " (unauthorized port)\n", dev->name,
0c68ae26 1943 hdr.addr1);
ce3edf6d
JB		 1944#endif
1945
1946 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1947
ec634fe3 1948 ret = NETDEV_TX_OK;
ce3edf6d
JB		 1949 goto fail;
1950 }
1951
a729cff8
JB		 1952 if (unlikely(!multicast && skb->sk &&
1953 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1954 struct sk_buff *orig_skb = skb;
1955
1956 skb = skb_clone(skb, GFP_ATOMIC);
1957 if (skb) {
1958 unsigned long flags;
1959 int id, r;
1960
1961 spin_lock_irqsave(&local->ack_status_lock, flags);
1962 r = idr_get_new_above(&local->ack_status_frames,
1963 orig_skb, 1, &id);
1964 if (r == -EAGAIN) {
1965 idr_pre_get(&local->ack_status_frames,
1966 GFP_ATOMIC);
1967 r = idr_get_new_above(&local->ack_status_frames,
1968 orig_skb, 1, &id);
1969 }
1970 if (WARN_ON(!id) || id > 0xffff) {
1971 idr_remove(&local->ack_status_frames, id);
1972 r = -ERANGE;
1973 }
1974 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1975
1976 if (!r) {
1977 info_id = id;
1978 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1979 } else if (skb_shared(skb)) {
1980 kfree_skb(orig_skb);
1981 } else {
1982 kfree_skb(skb);
1983 skb = orig_skb;
1984 }
1985 } else {
1986 /* couldn't clone -- lose tx status ... */
1987 skb = orig_skb;
1988 }
1989 }
1990
7e244707
HS		 1991 /*
1992 * If the skb is shared we need to obtain our own copy.
1993 */
1994 if (skb_shared(skb)) {
a729cff8
JB		 1995 struct sk_buff *tmp_skb = skb;
1996
1997 /* can't happen -- skb is a clone if info_id != 0 */
1998 WARN_ON(info_id);
1999
f8a0a781 2000 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2001 kfree_skb(tmp_skb);
2002
2003 if (!skb) {
2004 ret = NETDEV_TX_OK;
2005 goto fail;
2006 }
2007 }
2008
065e9605 2009 hdr.frame_control = fc;
e2ebc74d
JB		 2010 hdr.duration_id = 0;
2011 hdr.seq_ctrl = 0;
2012
2013 skip_header_bytes = ETH_HLEN;
2014 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2015 encaps_data = bridge_tunnel_header;
2016 encaps_len = sizeof(bridge_tunnel_header);
2017 skip_header_bytes -= 2;
2018 } else if (ethertype >= 0x600) {
2019 encaps_data = rfc1042_header;
2020 encaps_len = sizeof(rfc1042_header);
2021 skip_header_bytes -= 2;
2022 } else {
2023 encaps_data = NULL;
2024 encaps_len = 0;
2025 }
2026
7e244707
HS		 2027 nh_pos = skb_network_header(skb) - skb->data;
2028 h_pos = skb_transport_header(skb) - skb->data;
2029
e2ebc74d
JB		 2030 skb_pull(skb, skip_header_bytes);
2031 nh_pos -= skip_header_bytes;
2032 h_pos -= skip_header_bytes;
2033
23c0752a 2034 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2035
23c0752a
JB		 2036 /*
2037 * So we need to modify the skb header and hence need a copy of
2038 * that. The head_need variable above doesn't, so far, include
2039 * the needed header space that we don't need right away. If we
2040 * can, then we don't reallocate right now but only after the
2041 * frame arrives at the master device (if it does...)
2042 *
2043 * If we cannot, however, then we will reallocate to include all
2044 * the ever needed space. Also, if we need to reallocate it anyway,
2045 * make it big enough for everything we may ever need.
2046 */
e2ebc74d 2047
3a5be7d4 2048 if (head_need > 0 || skb_cloned(skb)) {
23c0752a
JB		 2049 head_need += IEEE80211_ENCRYPT_HEADROOM;
2050 head_need += local->tx_headroom;
2051 head_need = max_t(int, 0, head_need);
3bff1865 2052 if (ieee80211_skb_resize(sdata, skb, head_need, true))
e2ebc74d 2053 goto fail;
e2ebc74d
JB		 2054 }
2055
2056 if (encaps_data) {
2057 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2058 nh_pos += encaps_len;
2059 h_pos += encaps_len;
2060 }
c29b9b9b 2061
e4ab7eb0 2062#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2063 if (meshhdrlen > 0) {
2064 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2065 nh_pos += meshhdrlen;
2066 h_pos += meshhdrlen;
2067 }
e4ab7eb0 2068#endif
33b64eb2 2069
065e9605 2070 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2071 __le16 *qos_control;
2072
2073 qos_control = (__le16*) skb_push(skb, 2);
2074 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2075 /*
2076 * Maybe we could actually set some fields here, for now just
2077 * initialise to zero to indicate no special operation.
2078 */
2079 *qos_control = 0;
2080 } else
2081 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2082
e2ebc74d
JB		 2083 nh_pos += hdrlen;
2084 h_pos += hdrlen;
2085
68aae116
SH		 2086 dev->stats.tx_packets++;
2087 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 2088
2089 /* Update skb pointers to various headers since this modified frame
2090 * is going to go through Linux networking code that may potentially
2091 * need things like pointer to IP header. */
2092 skb_set_mac_header(skb, 0);
2093 skb_set_network_header(skb, nh_pos);
2094 skb_set_transport_header(skb, h_pos);
2095
489ee919 2096 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2097 memset(info, 0, sizeof(*info));
2098
e2ebc74d 2099 dev->trans_start = jiffies;
a729cff8
JB		 2100
2101 info->flags = info_flags;
2102 info->ack_frame_id = info_id;
2103
3b8d81e0 2104 ieee80211_xmit(sdata, skb);
e2ebc74d 2105
ec634fe3 2106 return NETDEV_TX_OK;
e2ebc74d
JB		 2107
2108 fail:
ec634fe3 2109 if (ret == NETDEV_TX_OK)
e2ebc74d
JB		 2110 dev_kfree_skb(skb);
2111
2112 return ret;
2113}
2114
e2ebc74d 2115
e2530083
JB		 2116/*
2117 * ieee80211_clear_tx_pending may not be called in a context where
2118 * it is possible that it packets could come in again.
2119 */
e2ebc74d
JB		 2120void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2121{
2de8e0d9 2122 int i;
e2ebc74d 2123
2a577d98
JB		 2124 for (i = 0; i < local->hw.queues; i++)
2125 skb_queue_purge(&local->pending[i]);
e2ebc74d
JB		 2126}
2127
7bb45683
JB		 2128/*
2129 * Returns false if the frame couldn't be transmitted but was queued instead,
2130 * which in this case means re-queued -- take as an indication to stop sending
2131 * more pending frames.
2132 */
cd8ffc80
JB		 2133static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2134 struct sk_buff *skb)
2135{
2136 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2137 struct ieee80211_sub_if_data *sdata;
2138 struct sta_info *sta;
2139 struct ieee80211_hdr *hdr;
7bb45683 2140 bool result;
cd8ffc80 2141
5061b0c2 2142 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 2143
2144 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
7bb45683 2145 result = ieee80211_tx(sdata, skb, true);
cd8ffc80 2146 } else {
252b86c4
JB		 2147 struct sk_buff_head skbs;
2148
2149 __skb_queue_head_init(&skbs);
2150 __skb_queue_tail(&skbs, skb);
2151
cd8ffc80 2152 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 2153 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 2154
74e4dbfd 2155 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 2156 }
2157
cd8ffc80
JB		 2158 return result;
2159}
2160
e2530083 2161/*
3b8d81e0 2162 * Transmit all pending packets. Called from tasklet.
e2530083 2163 */
e2ebc74d
JB		 2164void ieee80211_tx_pending(unsigned long data)
2165{
2166 struct ieee80211_local *local = (struct ieee80211_local *)data;
7236fe29 2167 struct ieee80211_sub_if_data *sdata;
2a577d98 2168 unsigned long flags;
cd8ffc80 2169 int i;
3b8d81e0 2170 bool txok;
e2ebc74d 2171
f0e72851 2172 rcu_read_lock();
e2530083 2173
3b8d81e0 2174 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 2175 for (i = 0; i < local->hw.queues; i++) {
2176 /*
2177 * If queue is stopped by something other than due to pending
2178 * frames, or we have no pending frames, proceed to next queue.
2179 */
3b8d81e0 2180 if (local->queue_stop_reasons[i] ||
2a577d98 2181 skb_queue_empty(&local->pending[i]))
e2ebc74d 2182 continue;
e2530083 2183
2a577d98 2184 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 2185 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 2186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 2187
a7bc376c
JB		 2188 if (WARN_ON(!info->control.vif)) {
2189 kfree_skb(skb);
2190 continue;
2191 }
2192
3b8d81e0
JB		 2193 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2194 flags);
2195
2196 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 2197 spin_lock_irqsave(&local->queue_stop_reason_lock,
2198 flags);
2199 if (!txok)
2a577d98 2200 break;
e2ebc74d 2201 }
7236fe29
JB		 2202
2203 if (skb_queue_empty(&local->pending[i]))
2204 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2337db8d 2205 netif_wake_subqueue(sdata->dev, i);
e2ebc74d 2206 }
3b8d81e0 2207 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 2208
f0e72851 2209 rcu_read_unlock();
e2ebc74d
JB		 2210}
2211
2212/* functions for drivers to get certain frames */
2213
8e7be8da 2214static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
5dfdaf58
JB		 2215 struct sk_buff *skb,
2216 struct beacon_data *beacon)
e2ebc74d
JB		 2217{
2218 u8 *pos, *tim;
2219 int aid0 = 0;
2220 int i, have_bits = 0, n1, n2;
2221
2222 /* Generate bitmap for TIM only if there are any STAs in power save
2223 * mode. */
e2ebc74d
JB		 2224 if (atomic_read(&bss->num_sta_ps) > 0)
2225 /* in the hope that this is faster than
2226 * checking byte-for-byte */
2227 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2228 IEEE80211_MAX_AID+1);
2229
2230 if (bss->dtim_count == 0)
5dfdaf58 2231 bss->dtim_count = beacon->dtim_period - 1;
e2ebc74d
JB		 2232 else
2233 bss->dtim_count--;
2234
2235 tim = pos = (u8 *) skb_put(skb, 6);
2236 *pos++ = WLAN_EID_TIM;
2237 *pos++ = 4;
2238 *pos++ = bss->dtim_count;
5dfdaf58 2239 *pos++ = beacon->dtim_period;
e2ebc74d
JB		 2240
2241 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2242 aid0 = 1;
2243
512119b3
CL		 2244 bss->dtim_bc_mc = aid0 == 1;
2245
e2ebc74d
JB		 2246 if (have_bits) {
2247 /* Find largest even number N1 so that bits numbered 1 through
2248 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2249 * (N2 + 1) x 8 through 2007 are 0. */
2250 n1 = 0;
2251 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2252 if (bss->tim[i]) {
2253 n1 = i & 0xfe;
2254 break;
2255 }
2256 }
2257 n2 = n1;
2258 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2259 if (bss->tim[i]) {
2260 n2 = i;
2261 break;
2262 }
2263 }
2264
2265 /* Bitmap control */
2266 *pos++ = n1 | aid0;
2267 /* Part Virt Bitmap */
2268 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2269
2270 tim[1] = n2 - n1 + 4;
2271 skb_put(skb, n2 - n1);
2272 } else {
2273 *pos++ = aid0; /* Bitmap control */
2274 *pos++ = 0; /* Part Virt Bitmap */
2275 }
e2ebc74d
JB		 2276}
2277
eddcbb94
JB		 2278struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2279 struct ieee80211_vif *vif,
2280 u16 *tim_offset, u16 *tim_length)
e2ebc74d
JB		 2281{
2282 struct ieee80211_local *local = hw_to_local(hw);
9d139c81 2283 struct sk_buff *skb = NULL;
e039fa4a 2284 struct ieee80211_tx_info *info;
e2ebc74d
JB		 2285 struct ieee80211_sub_if_data *sdata = NULL;
2286 struct ieee80211_if_ap *ap = NULL;
5dfdaf58 2287 struct beacon_data *beacon;
8318d78a 2288 struct ieee80211_supported_band *sband;
2e92e6f2 2289 enum ieee80211_band band = local->hw.conf.channel->band;
e00cfce0 2290 struct ieee80211_tx_rate_control txrc;
8318d78a 2291
2e92e6f2 2292 sband = local->hw.wiphy->bands[band];
5dfdaf58
JB		 2293
2294 rcu_read_lock();
e2ebc74d 2295
32bfd35d 2296 sdata = vif_to_sdata(vif);
e2ebc74d 2297
eb3e554b
FF		 2298 if (!ieee80211_sdata_running(sdata))
2299 goto out;
2300
eddcbb94
JB		 2301 if (tim_offset)
2302 *tim_offset = 0;
2303 if (tim_length)
2304 *tim_length = 0;
2305
05c914fe 2306 if (sdata->vif.type == NL80211_IFTYPE_AP) {
33b64eb2
LCC		 2307 ap = &sdata->u.ap;
2308 beacon = rcu_dereference(ap->beacon);
3ad97fbc 2309 if (beacon) {
902acc78
JB		 2310 /*
2311 * headroom, head length,
2312 * tail length and maximum TIM length
2313 */
2314 skb = dev_alloc_skb(local->tx_headroom +
2315 beacon->head_len +
2316 beacon->tail_len + 256);
2317 if (!skb)
2318 goto out;
33b64eb2 2319
902acc78
JB		 2320 skb_reserve(skb, local->tx_headroom);
2321 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2322 beacon->head_len);
33b64eb2 2323
d0709a65
JB		 2324 /*
2325 * Not very nice, but we want to allow the driver to call
2326 * ieee80211_beacon_get() as a response to the set_tim()
2327 * callback. That, however, is already invoked under the
2328 * sta_lock to guarantee consistent and race-free update
2329 * of the tim bitmap in mac80211 and the driver.
2330 */
2331 if (local->tim_in_locked_section) {
8e7be8da 2332 ieee80211_beacon_add_tim(ap, skb, beacon);
d0709a65
JB		 2333 } else {
2334 unsigned long flags;
2335
2336 spin_lock_irqsave(&local->sta_lock, flags);
8e7be8da 2337 ieee80211_beacon_add_tim(ap, skb, beacon);
d0709a65
JB		 2338 spin_unlock_irqrestore(&local->sta_lock, flags);
2339 }
33b64eb2 2340
eddcbb94
JB		 2341 if (tim_offset)
2342 *tim_offset = beacon->head_len;
2343 if (tim_length)
2344 *tim_length = skb->len - beacon->head_len;
2345
902acc78
JB		 2346 if (beacon->tail)
2347 memcpy(skb_put(skb, beacon->tail_len),
2348 beacon->tail, beacon->tail_len);
9d139c81
JB		 2349 } else
2350 goto out;
05c914fe 2351 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 2352 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 2353 struct ieee80211_hdr *hdr;
af8cdcd8 2354 struct sk_buff *presp = rcu_dereference(ifibss->presp);
33b64eb2 2355
af8cdcd8 2356 if (!presp)
9d139c81
JB		 2357 goto out;
2358
af8cdcd8 2359 skb = skb_copy(presp, GFP_ATOMIC);
9d139c81
JB		 2360 if (!skb)
2361 goto out;
2362
2363 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 2364 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2365 IEEE80211_STYPE_BEACON);
902acc78 2366 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
472dbc45
JB		 2367 struct ieee80211_mgmt *mgmt;
2368 u8 *pos;
3b69a9c5
TP		 2369 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2370 sizeof(mgmt->u.beacon);
472dbc45 2371
ac1bd846
JB		 2372#ifdef CONFIG_MAC80211_MESH
2373 if (!sdata->u.mesh.mesh_id_len)
2374 goto out;
2375#endif
2376
3b69a9c5
TP		 2377 skb = dev_alloc_skb(local->tx_headroom +
2378 hdr_len +
2379 2 + /* NULL SSID */
2380 2 + 8 + /* supported rates */
2381 2 + 3 + /* DS params */
2382 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
176f3608
TP		 2383 2 + sizeof(struct ieee80211_ht_cap) +
2384 2 + sizeof(struct ieee80211_ht_info) +
3b69a9c5
TP		 2385 2 + sdata->u.mesh.mesh_id_len +
2386 2 + sizeof(struct ieee80211_meshconf_ie) +
2387 sdata->u.mesh.ie_len);
902acc78
JB		 2388 if (!skb)
2389 goto out;
2390
2391 skb_reserve(skb, local->hw.extra_tx_headroom);
3b69a9c5
TP		 2392 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2393 memset(mgmt, 0, hdr_len);
065e9605
HH		 2394 mgmt->frame_control =
2395 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
902acc78 2396 memset(mgmt->da, 0xff, ETH_ALEN);
47846c9b
JB		 2397 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2398 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
902acc78 2399 mgmt->u.beacon.beacon_int =
57c4d7b4 2400 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
082ebb0c
TP		 2401 mgmt->u.beacon.capab_info |= cpu_to_le16(
2402 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
902acc78
JB		 2403
2404 pos = skb_put(skb, 2);
2405 *pos++ = WLAN_EID_SSID;
2406 *pos++ = 0x0;
2407
768db343 2408 if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
082ebb0c 2409 mesh_add_ds_params_ie(skb, sdata) ||
768db343 2410 ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
082ebb0c 2411 mesh_add_rsn_ie(skb, sdata) ||
176f3608
TP		 2412 mesh_add_ht_cap_ie(skb, sdata) ||
2413 mesh_add_ht_info_ie(skb, sdata) ||
082ebb0c
TP		 2414 mesh_add_meshid_ie(skb, sdata) ||
2415 mesh_add_meshconf_ie(skb, sdata) ||
2416 mesh_add_vendor_ies(skb, sdata)) {
2417 pr_err("o11s: couldn't add ies!\n");
2418 goto out;
2419 }
9d139c81
JB		 2420 } else {
2421 WARN_ON(1);
5dfdaf58 2422 goto out;
e2ebc74d
JB		 2423 }
2424
e039fa4a
JB		 2425 info = IEEE80211_SKB_CB(skb);
2426
3b8d81e0 2427 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 2428 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 2429 info->band = band;
e00cfce0
JM		 2430
2431 memset(&txrc, 0, sizeof(txrc));
2432 txrc.hw = hw;
2433 txrc.sband = sband;
2434 txrc.bss_conf = &sdata->vif.bss_conf;
2435 txrc.skb = skb;
2436 txrc.reported_rate.idx = -1;
37eb0b16
JM		 2437 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2438 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2439 txrc.max_rate_idx = -1;
2440 else
2441 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 2442 txrc.bss = true;
e00cfce0 2443 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 2444
2445 info->control.vif = vif;
f591fa5d 2446
a472e71b
JL		 2447 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2448 IEEE80211_TX_CTL_ASSIGN_SEQ |
2449 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 2450 out:
5dfdaf58 2451 rcu_read_unlock();
e2ebc74d
JB		 2452 return skb;
2453}
eddcbb94 2454EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 2455
02945821
AN		 2456struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2457 struct ieee80211_vif *vif)
2458{
2459 struct ieee80211_if_ap *ap = NULL;
2460 struct sk_buff *presp = NULL, *skb = NULL;
2461 struct ieee80211_hdr *hdr;
2462 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2463
2464 if (sdata->vif.type != NL80211_IFTYPE_AP)
2465 return NULL;
2466
2467 rcu_read_lock();
2468
2469 ap = &sdata->u.ap;
2470 presp = rcu_dereference(ap->probe_resp);
2471 if (!presp)
2472 goto out;
2473
2474 skb = skb_copy(presp, GFP_ATOMIC);
2475 if (!skb)
2476 goto out;
2477
2478 hdr = (struct ieee80211_hdr *) skb->data;
2479 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2480
2481out:
2482 rcu_read_unlock();
2483 return skb;
2484}
2485EXPORT_SYMBOL(ieee80211_proberesp_get);
2486
7044cc56
KV		 2487struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2488 struct ieee80211_vif *vif)
2489{
2490 struct ieee80211_sub_if_data *sdata;
2491 struct ieee80211_if_managed *ifmgd;
2492 struct ieee80211_pspoll *pspoll;
2493 struct ieee80211_local *local;
2494 struct sk_buff *skb;
2495
2496 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2497 return NULL;
2498
2499 sdata = vif_to_sdata(vif);
2500 ifmgd = &sdata->u.mgd;
2501 local = sdata->local;
2502
2503 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 2504 if (!skb)
7044cc56 2505 return NULL;
d15b8459 2506
7044cc56
KV		 2507 skb_reserve(skb, local->hw.extra_tx_headroom);
2508
2509 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2510 memset(pspoll, 0, sizeof(*pspoll));
2511 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2512 IEEE80211_STYPE_PSPOLL);
2513 pspoll->aid = cpu_to_le16(ifmgd->aid);
2514
2515 /* aid in PS-Poll has its two MSBs each set to 1 */
2516 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2517
2518 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2519 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2520
2521 return skb;
2522}
2523EXPORT_SYMBOL(ieee80211_pspoll_get);
2524
2525struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2526 struct ieee80211_vif *vif)
2527{
2528 struct ieee80211_hdr_3addr *nullfunc;
2529 struct ieee80211_sub_if_data *sdata;
2530 struct ieee80211_if_managed *ifmgd;
2531 struct ieee80211_local *local;
2532 struct sk_buff *skb;
2533
2534 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2535 return NULL;
2536
2537 sdata = vif_to_sdata(vif);
2538 ifmgd = &sdata->u.mgd;
2539 local = sdata->local;
2540
2541 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 2542 if (!skb)
7044cc56 2543 return NULL;
d15b8459 2544
7044cc56
KV		 2545 skb_reserve(skb, local->hw.extra_tx_headroom);
2546
2547 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2548 sizeof(*nullfunc));
2549 memset(nullfunc, 0, sizeof(*nullfunc));
2550 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2551 IEEE80211_STYPE_NULLFUNC |
2552 IEEE80211_FCTL_TODS);
2553 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2554 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2555 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2556
2557 return skb;
2558}
2559EXPORT_SYMBOL(ieee80211_nullfunc_get);
2560
05e54ea6
KV		 2561struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2562 struct ieee80211_vif *vif,
2563 const u8 *ssid, size_t ssid_len,
2564 const u8 *ie, size_t ie_len)
2565{
2566 struct ieee80211_sub_if_data *sdata;
2567 struct ieee80211_local *local;
2568 struct ieee80211_hdr_3addr *hdr;
2569 struct sk_buff *skb;
2570 size_t ie_ssid_len;
2571 u8 *pos;
2572
2573 sdata = vif_to_sdata(vif);
2574 local = sdata->local;
2575 ie_ssid_len = 2 + ssid_len;
2576
2577 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2578 ie_ssid_len + ie_len);
d15b8459 2579 if (!skb)
05e54ea6 2580 return NULL;
05e54ea6
KV		 2581
2582 skb_reserve(skb, local->hw.extra_tx_headroom);
2583
2584 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2585 memset(hdr, 0, sizeof(*hdr));
2586 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2587 IEEE80211_STYPE_PROBE_REQ);
2588 memset(hdr->addr1, 0xff, ETH_ALEN);
2589 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2590 memset(hdr->addr3, 0xff, ETH_ALEN);
2591
2592 pos = skb_put(skb, ie_ssid_len);
2593 *pos++ = WLAN_EID_SSID;
2594 *pos++ = ssid_len;
2595 if (ssid)
2596 memcpy(pos, ssid, ssid_len);
2597 pos += ssid_len;
2598
2599 if (ie) {
2600 pos = skb_put(skb, ie_len);
2601 memcpy(pos, ie, ie_len);
2602 }
2603
2604 return skb;
2605}
2606EXPORT_SYMBOL(ieee80211_probereq_get);
2607
32bfd35d 2608void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2609 const void *frame, size_t frame_len,
e039fa4a 2610 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2611 struct ieee80211_rts *rts)
2612{
2613 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2614
065e9605
HH		 2615 rts->frame_control =
2616 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 2617 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2618 frame_txctl);
e2ebc74d
JB		 2619 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2620 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2621}
2622EXPORT_SYMBOL(ieee80211_rts_get);
2623
32bfd35d 2624void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2625 const void *frame, size_t frame_len,
e039fa4a 2626 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2627 struct ieee80211_cts *cts)
2628{
2629 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2630
065e9605
HH		 2631 cts->frame_control =
2632 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 2633 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2634 frame_len, frame_txctl);
e2ebc74d
JB		 2635 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2636}
2637EXPORT_SYMBOL(ieee80211_ctstoself_get);
2638
2639struct sk_buff *
32bfd35d 2640ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 2641 struct ieee80211_vif *vif)
e2ebc74d
JB		 2642{
2643 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 2644 struct sk_buff *skb = NULL;
5cf121c3 2645 struct ieee80211_tx_data tx;
e2ebc74d
JB		 2646 struct ieee80211_sub_if_data *sdata;
2647 struct ieee80211_if_ap *bss = NULL;
5dfdaf58 2648 struct beacon_data *beacon;
e039fa4a 2649 struct ieee80211_tx_info *info;
e2ebc74d 2650
32bfd35d 2651 sdata = vif_to_sdata(vif);
747cf5e9 2652 bss = &sdata->u.ap;
5dfdaf58 2653
5dfdaf58
JB		 2654 rcu_read_lock();
2655 beacon = rcu_dereference(bss->beacon);
2656
05c914fe 2657 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
747cf5e9 2658 goto out;
5dfdaf58 2659
512119b3 2660 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
747cf5e9 2661 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 2662
e2ebc74d
JB		 2663 while (1) {
2664 skb = skb_dequeue(&bss->ps_bc_buf);
2665 if (!skb)
747cf5e9 2666 goto out;
e2ebc74d
JB		 2667 local->total_ps_buffered--;
2668
2669 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2670 struct ieee80211_hdr *hdr =
2671 (struct ieee80211_hdr *) skb->data;
2672 /* more buffered multicast/broadcast frames ==> set
2673 * MoreData flag in IEEE 802.11 header to inform PS
2674 * STAs */
2675 hdr->frame_control |=
2676 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2677 }
2678
3b8d81e0 2679 if (!ieee80211_tx_prepare(sdata, &tx, skb))
e2ebc74d
JB		 2680 break;
2681 dev_kfree_skb_any(skb);
2682 }
e039fa4a
JB		 2683
2684 info = IEEE80211_SKB_CB(skb);
2685
5cf121c3
JB		 2686 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2687 tx.channel = local->hw.conf.channel;
e039fa4a 2688 info->band = tx.channel->band;
e2ebc74d 2689
97b045d6 2690 if (invoke_tx_handlers(&tx))
e2ebc74d 2691 skb = NULL;
97b045d6 2692 out:
d0709a65 2693 rcu_read_unlock();
e2ebc74d
JB		 2694
2695 return skb;
2696}
2697EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 2698
62ae67be 2699void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
3b8d81e0 2700{
3b8d81e0
JB		 2701 skb_set_mac_header(skb, 0);
2702 skb_set_network_header(skb, 0);
2703 skb_set_transport_header(skb, 0);
2704
4c468fe5
AN		 2705 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2706 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
2707 skb->priority = 7;
cf0277e7 2708
3d34deb6
JB		 2709 /*
2710 * The other path calling ieee80211_xmit is from the tasklet,
2711 * and while we can handle concurrent transmissions locking
2712 * requirements are that we do not come into tx with bhs on.
2713 */
2714 local_bh_disable();
3b8d81e0 2715 ieee80211_xmit(sdata, skb);
3d34deb6 2716 local_bh_enable();
3b8d81e0 2717}
kernel source for telekom puls (alcatel/mediatek)