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cfg80211: Improve Connect/Associate command documentation
[deliverable/linux.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>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
e2ebc74d
JB		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 *
13 * Transmit and frame generation functions.
14 */
15
16#include <linux/kernel.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/etherdevice.h>
20#include <linux/bitmap.h>
d4e46a3d 21#include <linux/rcupdate.h>
bc3b2d7f 22#include <linux/export.h>
881d966b 23#include <net/net_namespace.h>
e2ebc74d
JB		 24#include <net/ieee80211_radiotap.h>
25#include <net/cfg80211.h>
26#include <net/mac80211.h>
27#include <asm/unaligned.h>
28
29#include "ieee80211_i.h"
24487981 30#include "driver-ops.h"
2c8dccc7 31#include "led.h"
33b64eb2 32#include "mesh.h"
e2ebc74d
JB		 33#include "wep.h"
34#include "wpa.h"
35#include "wme.h"
2c8dccc7 36#include "rate.h"
e2ebc74d 37
e2ebc74d
JB		 38/* misc utils */
39
5a490510
JB		 40static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
41{
42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
43
44 u64_stats_update_begin(&tstats->syncp);
45 tstats->tx_packets++;
46 tstats->tx_bytes += len;
47 u64_stats_update_end(&tstats->syncp);
48}
49
252b86c4
JB		 50static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
51 struct sk_buff *skb, int group_addr,
03f93c3d 52 int next_frag_len)
e2ebc74d 53{
2103dec1 54 int rate, mrate, erp, dur, i, shift = 0;
2e92e6f2 55 struct ieee80211_rate *txrate;
e2ebc74d 56 struct ieee80211_local *local = tx->local;
8318d78a 57 struct ieee80211_supported_band *sband;
358c8d9d 58 struct ieee80211_hdr *hdr;
252b86c4 59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2103dec1
SW		 60 struct ieee80211_chanctx_conf *chanctx_conf;
61 u32 rate_flags = 0;
62
63 rcu_read_lock();
64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
65 if (chanctx_conf) {
66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
68 }
69 rcu_read_unlock();
e6a9854b
JB		 70
71 /* assume HW handles this */
336004e2 72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
e6a9854b
JB		 73 return 0;
74
75 /* uh huh? */
0d528d85 76 if (WARN_ON_ONCE(tx->rate.idx < 0))
e6a9854b 77 return 0;
e2ebc74d 78
2d56577b 79 sband = local->hw.wiphy->bands[info->band];
0d528d85 80 txrate = &sband->bitrates[tx->rate.idx];
8318d78a 81
e6a9854b 82 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 83
84 /*
85 * data and mgmt (except PS Poll):
86 * - during CFP: 32768
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
93 *
94 * IEEE 802.11, 9.6:
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
99 * BSSBasicRateSet
100 */
252b86c4 101 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 102 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 103 /* TODO: These control frames are not currently sent by
ccd7b362 104 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 105 * needs to be updated to support duration field calculation.
106 *
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
114 * and its SIFS
115 * PS Poll: BIT(15) | BIT(14) | aid
116 */
117 return 0;
118 }
119
120 /* data/mgmt */
121 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 122 return cpu_to_le16(32768);
e2ebc74d
JB		 123
124 if (group_addr) /* Group address as the destination - no ACK */
125 return 0;
126
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
136 */
137 rate = -1;
8318d78a
JB		 138 /* use lowest available if everything fails */
139 mrate = sband->bitrates[0].bitrate;
140 for (i = 0; i < sband->n_bitrates; i++) {
141 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 142
8318d78a
JB		 143 if (r->bitrate > txrate->bitrate)
144 break;
e2ebc74d 145
2103dec1
SW		 146 if ((rate_flags & r->flags) != rate_flags)
147 continue;
148
bda3933a 149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
2103dec1 150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
8318d78a
JB		 151
152 switch (sband->band) {
153 case IEEE80211_BAND_2GHZ: {
154 u32 flag;
155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
156 flag = IEEE80211_RATE_MANDATORY_G;
157 else
158 flag = IEEE80211_RATE_MANDATORY_B;
159 if (r->flags & flag)
160 mrate = r->bitrate;
161 break;
162 }
163 case IEEE80211_BAND_5GHZ:
164 if (r->flags & IEEE80211_RATE_MANDATORY_A)
165 mrate = r->bitrate;
166 break;
3a0c52a6
VK		 167 case IEEE80211_BAND_60GHZ:
168 /* TODO, for now fall through */
8318d78a
JB		 169 case IEEE80211_NUM_BANDS:
170 WARN_ON(1);
171 break;
172 }
e2ebc74d
JB		 173 }
174 if (rate == -1) {
175 /* No matching basic rate found; use highest suitable mandatory
176 * PHY rate */
2103dec1 177 rate = DIV_ROUND_UP(mrate, 1 << shift);
e2ebc74d
JB		 178 }
179
6674f210
SW		 180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr->frame_control) &&
c26a0e10 182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
6674f210
SW		 183 dur = 0;
184 else
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
4ee73f33 188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
438b61b7
SW		 189 tx->sdata->vif.bss_conf.use_short_preamble,
190 shift);
e2ebc74d
JB		 191
192 if (next_frag_len) {
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
196 /* next fragment */
4ee73f33 197 dur += ieee80211_frame_duration(sband->band, next_frag_len,
8318d78a 198 txrate->bitrate, erp,
438b61b7
SW		 199 tx->sdata->vif.bss_conf.use_short_preamble,
200 shift);
e2ebc74d
JB		 201 }
202
03f93c3d 203 return cpu_to_le16(dur);
e2ebc74d
JB		 204}
205
e2ebc74d 206/* tx handlers */
5c1b98a5
KV		 207static ieee80211_tx_result debug_noinline
208ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
209{
210 struct ieee80211_local *local = tx->local;
0c74211d 211 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 212
213 /* driver doesn't support power save */
30686bf7 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
5c1b98a5
KV		 215 return TX_CONTINUE;
216
217 /* hardware does dynamic power save */
30686bf7 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
5c1b98a5
KV		 219 return TX_CONTINUE;
220
221 /* dynamic power save disabled */
222 if (local->hw.conf.dynamic_ps_timeout <= 0)
223 return TX_CONTINUE;
224
225 /* we are scanning, don't enable power save */
226 if (local->scanning)
227 return TX_CONTINUE;
228
229 if (!local->ps_sdata)
230 return TX_CONTINUE;
231
232 /* No point if we're going to suspend */
233 if (local->quiescing)
234 return TX_CONTINUE;
235
0c74211d
KV		 236 /* dynamic ps is supported only in managed mode */
237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
238 return TX_CONTINUE;
239
240 ifmgd = &tx->sdata->u.mgd;
241
242 /*
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
249 * peer application.
250 *
dc41e4d4 251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
0c74211d
KV		 252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
254 */
4875d30d
JB		 255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
0c74211d
KV		 258 return TX_CONTINUE;
259
5c1b98a5
KV		 260 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
261 ieee80211_stop_queues_by_reason(&local->hw,
445ea4e8 262 IEEE80211_MAX_QUEUE_MAP,
cca07b00
LC		 263 IEEE80211_QUEUE_STOP_REASON_PS,
264 false);
db28569a 265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 266 ieee80211_queue_work(&local->hw,
267 &local->dynamic_ps_disable_work);
268 }
269
5db1c07c
LC		 270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd->associated)
272 return TX_CONTINUE;
273
5c1b98a5
KV		 274 mod_timer(&local->dynamic_ps_timer, jiffies +
275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
276
277 return TX_CONTINUE;
278}
e2ebc74d 279
d9e8a70f 280static ieee80211_tx_result debug_noinline
5cf121c3 281ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 282{
358c8d9d 283
e039fa4a 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 286 bool assoc = false;
e2ebc74d 287
e039fa4a 288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 289 return TX_CONTINUE;
58d4185e 290
b23b025f
BG		 291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 293 !ieee80211_is_probe_req(hdr->frame_control) &&
294 !ieee80211_is_nullfunc(hdr->frame_control))
295 /*
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
303 *
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
305 */
9ae54c84 306 return TX_DROP;
e2ebc74d 307
239281f8
RL		 308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
309 return TX_CONTINUE;
310
1be7fe8d
BJ		 311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
312 return TX_CONTINUE;
313
5cf121c3 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 315 return TX_CONTINUE;
e2ebc74d 316
c2c98fde
JB		 317 if (tx->sta)
318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 319
5cf121c3 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 321 if (unlikely(!assoc &&
358c8d9d 322 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d 323#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0
JB		 324 sdata_info(tx->sdata,
325 "dropped data frame to not associated station %pM\n",
326 hdr->addr1);
327#endif
e2ebc74d 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 329 return TX_DROP;
e2ebc74d 330 }
29623892
JB		 331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
332 ieee80211_is_data(hdr->frame_control) &&
030ef8f8 333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
29623892
JB		 334 /*
335 * No associated STAs - no need to send multicast
336 * frames.
337 */
338 return TX_DROP;
e2ebc74d
JB		 339 }
340
9ae54c84 341 return TX_CONTINUE;
e2ebc74d
JB		 342}
343
e2ebc74d
JB		 344/* This function is called whenever the AP is about to exceed the maximum limit
345 * of buffered frames for power saving STAs. This situation should not really
346 * happen often during normal operation, so dropping the oldest buffered packet
347 * from each queue should be OK to make some room for new frames. */
348static void purge_old_ps_buffers(struct ieee80211_local *local)
349{
350 int total = 0, purged = 0;
351 struct sk_buff *skb;
352 struct ieee80211_sub_if_data *sdata;
353 struct sta_info *sta;
354
79010420 355 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
d012a605
MP		 356 struct ps_data *ps;
357
358 if (sdata->vif.type == NL80211_IFTYPE_AP)
359 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 360 else if (ieee80211_vif_is_mesh(&sdata->vif))
361 ps = &sdata->u.mesh.ps;
d012a605 362 else
e2ebc74d 363 continue;
d012a605
MP		 364
365 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d
JB		 366 if (skb) {
367 purged++;
368 dev_kfree_skb(skb);
369 }
d012a605 370 total += skb_queue_len(&ps->bc_buf);
e2ebc74d 371 }
e2ebc74d 372
948d887d
JB		 373 /*
374 * Drop one frame from each station from the lowest-priority
375 * AC that has frames at all.
376 */
d0709a65 377 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 378 int ac;
379
380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
381 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
382 total += skb_queue_len(&sta->ps_tx_buf[ac]);
383 if (skb) {
384 purged++;
c3e7724b 385 ieee80211_free_txskb(&local->hw, skb);
948d887d
JB		 386 break;
387 }
e2ebc74d 388 }
e2ebc74d 389 }
d0709a65 390
e2ebc74d 391 local->total_ps_buffered = total;
bdcbd8e0 392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
e2ebc74d
JB		 393}
394
9ae54c84 395static ieee80211_tx_result
5cf121c3 396ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 397{
e039fa4a 398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d012a605 400 struct ps_data *ps;
e039fa4a 401
7d54d0dd
JB		 402 /*
403 * broadcast/multicast frame
404 *
3f52b7e3 405 * If any of the associated/peer stations is in power save mode,
7d54d0dd
JB		 406 * the frame is buffered to be sent after DTIM beacon frame.
407 * This is done either by the hardware or us.
408 */
409
3f52b7e3 410 /* powersaving STAs currently only in AP/VLAN/mesh mode */
d012a605
MP		 411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
413 if (!tx->sdata->bss)
414 return TX_CONTINUE;
415
416 ps = &tx->sdata->bss->ps;
3f52b7e3
MP		 417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
418 ps = &tx->sdata->u.mesh.ps;
d012a605 419 } else {
3e122be0 420 return TX_CONTINUE;
d012a605
MP		 421 }
422
3e122be0
JB		 423
424 /* no buffering for ordered frames */
358c8d9d 425 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 426 return TX_CONTINUE;
7d54d0dd 427
08b99399
JB		 428 if (ieee80211_is_probe_req(hdr->frame_control))
429 return TX_CONTINUE;
430
30686bf7 431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
f4d57941
JB		 432 info->hw_queue = tx->sdata->vif.cab_queue;
433
7d54d0dd 434 /* no stations in PS mode */
d012a605 435 if (!atomic_read(&ps->num_sta_ps))
9ae54c84 436 return TX_CONTINUE;
7d54d0dd 437
62b517cb 438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
62b1208e 439
62b517cb 440 /* device releases frame after DTIM beacon */
30686bf7 441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
62b1208e 442 return TX_CONTINUE;
62b1208e 443
7d54d0dd 444 /* buffered in mac80211 */
62b1208e
JB		 445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
446 purge_old_ps_buffers(tx->local);
447
d012a605 448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
bdcbd8e0
JB		 449 ps_dbg(tx->sdata,
450 "BC TX buffer full - dropping the oldest frame\n");
d012a605 451 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
62b1208e
JB		 452 } else
453 tx->local->total_ps_buffered++;
e2ebc74d 454
d012a605 455 skb_queue_tail(&ps->bc_buf, tx->skb);
7d54d0dd 456
62b1208e 457 return TX_QUEUED;
e2ebc74d
JB		 458}
459
fb733336
JM		 460static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
461 struct sk_buff *skb)
462{
463 if (!ieee80211_is_mgmt(fc))
464 return 0;
465
c2c98fde 466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 467 return 0;
468
d8ca16db 469 if (!ieee80211_is_robust_mgmt_frame(skb))
fb733336
JM		 470 return 0;
471
472 return 1;
473}
474
9ae54c84 475static ieee80211_tx_result
5cf121c3 476ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 477{
478 struct sta_info *sta = tx->sta;
e039fa4a 479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
08b99399 480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 481 struct ieee80211_local *local = tx->local;
e2ebc74d 482
02f2f1a9 483 if (unlikely(!sta))
9ae54c84 484 return TX_CONTINUE;
e2ebc74d 485
c2c98fde 486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
5ac2e350
JB		 487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
02f2f1a9 489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
948d887d
JB		 490 int ac = skb_get_queue_mapping(tx->skb);
491
08b99399
JB		 492 if (ieee80211_is_mgmt(hdr->frame_control) &&
493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
495 return TX_CONTINUE;
496 }
497
bdcbd8e0
JB		 498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
499 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d
JB		 500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
501 purge_old_ps_buffers(tx->local);
1d147bfa
EG		 502
503 /* sync with ieee80211_sta_ps_deliver_wakeup */
504 spin_lock(&sta->ps_lock);
505 /*
506 * STA woke up the meantime and all the frames on ps_tx_buf have
507 * been queued to pending queue. No reordering can happen, go
508 * ahead and Tx the packet.
509 */
510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
5ac2e350
JB		 511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
1d147bfa
EG		 513 spin_unlock(&sta->ps_lock);
514 return TX_CONTINUE;
515 }
516
948d887d
JB		 517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
bdcbd8e0
JB		 519 ps_dbg(tx->sdata,
520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
521 sta->sta.addr, ac);
c3e7724b 522 ieee80211_free_txskb(&local->hw, old);
e2ebc74d
JB		 523 } else
524 tx->local->total_ps_buffered++;
004c872e 525
e039fa4a 526 info->control.jiffies = jiffies;
5061b0c2 527 info->control.vif = &tx->sdata->vif;
8f77f384 528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
03c8c06f 529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
948d887d 530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
1d147bfa 531 spin_unlock(&sta->ps_lock);
3393a608
JO		 532
533 if (!timer_pending(&local->sta_cleanup))
534 mod_timer(&local->sta_cleanup,
535 round_jiffies(jiffies +
536 STA_INFO_CLEANUP_INTERVAL));
537
c868cb35
JB		 538 /*
539 * We queued up some frames, so the TIM bit might
540 * need to be set, recalculate it.
541 */
542 sta_info_recalc_tim(sta);
543
9ae54c84 544 return TX_QUEUED;
bdcbd8e0
JB		 545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
546 ps_dbg(tx->sdata,
547 "STA %pM in PS mode, but polling/in SP -> send frame\n",
548 sta->sta.addr);
e2ebc74d 549 }
e2ebc74d 550
9ae54c84 551 return TX_CONTINUE;
e2ebc74d
JB		 552}
553
d9e8a70f 554static ieee80211_tx_result debug_noinline
5cf121c3 555ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 556{
5cf121c3 557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 558 return TX_CONTINUE;
e2ebc74d 559
5cf121c3 560 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 561 return ieee80211_tx_h_unicast_ps_buf(tx);
562 else
563 return ieee80211_tx_h_multicast_ps_buf(tx);
564}
565
a621fa4d
JB		 566static ieee80211_tx_result debug_noinline
567ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
568{
569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
570
af61a165
JB		 571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
572 if (tx->sdata->control_port_no_encrypt)
573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
9c1c98a3 575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
af61a165 576 }
a621fa4d
JB		 577
578 return TX_CONTINUE;
579}
580
d9e8a70f 581static ieee80211_tx_result debug_noinline
5cf121c3 582ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 583{
46e6de15 584 struct ieee80211_key *key;
e039fa4a 585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 587
3b8d81e0 588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 589 tx->key = NULL;
2475b1cc
MS		 590 else if (tx->sta &&
591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
d4e46a3d 592 tx->key = key;
3cfcf6ac 593 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324 594 is_multicast_ether_addr(hdr->addr1) &&
d8ca16db 595 ieee80211_is_robust_mgmt_frame(tx->skb) &&
3cfcf6ac
JM		 596 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
597 tx->key = key;
f7e0104c
JB		 598 else if (is_multicast_ether_addr(hdr->addr1) &&
599 (key = rcu_dereference(tx->sdata->default_multicast_key)))
600 tx->key = key;
601 else if (!is_multicast_ether_addr(hdr->addr1) &&
602 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 603 tx->key = key;
e8f4fb7c 604 else
4922f71f 605 tx->key = NULL;
e2ebc74d
JB		 606
607 if (tx->key) {
813d7669
JB		 608 bool skip_hw = false;
609
011bfcc4 610 /* TODO: add threshold stuff again */
176e4f84 611
97359d12
JB		 612 switch (tx->key->conf.cipher) {
613 case WLAN_CIPHER_SUITE_WEP40:
614 case WLAN_CIPHER_SUITE_WEP104:
97359d12 615 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 616 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 617 tx->key = NULL;
618 break;
97359d12 619 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db 620 case WLAN_CIPHER_SUITE_CCMP_256:
00b9cfa3
JM		 621 case WLAN_CIPHER_SUITE_GCMP:
622 case WLAN_CIPHER_SUITE_GCMP_256:
fb733336
JM		 623 if (!ieee80211_is_data_present(hdr->frame_control) &&
624 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
625 tx->skb))
626 tx->key = NULL;
3b43a187
KV		 627 else
628 skip_hw = (tx->key->conf.flags &
e548c49e 629 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 630 ieee80211_is_mgmt(hdr->frame_control);
fb733336 631 break;
97359d12 632 case WLAN_CIPHER_SUITE_AES_CMAC:
56c52da2 633 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
8ade538b
JM		 634 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
635 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3cfcf6ac
JM		 636 if (!ieee80211_is_mgmt(hdr->frame_control))
637 tx->key = NULL;
638 break;
176e4f84 639 }
813d7669 640
e54faf29
JB		 641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
642 !ieee80211_is_deauth(hdr->frame_control)))
95acac61
JB		 643 return TX_DROP;
644
f12553eb 645 if (!skip_hw && tx->key &&
382b1655 646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 647 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 648 }
649
9ae54c84 650 return TX_CONTINUE;
e2ebc74d
JB		 651}
652
d9e8a70f 653static ieee80211_tx_result debug_noinline
5cf121c3 654ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 655{
e039fa4a 656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 657 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
658 struct ieee80211_supported_band *sband;
a2c40249 659 u32 len;
e6a9854b 660 struct ieee80211_tx_rate_control txrc;
0d528d85 661 struct ieee80211_sta_rates *ratetbl = NULL;
c2c98fde 662 bool assoc = false;
8318d78a 663
e6a9854b 664 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 665
2d56577b 666 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 667
a2c40249 668 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 669 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 670
671 /* set up the tx rate control struct we give the RC algo */
005e472b 672 txrc.hw = &tx->local->hw;
e6a9854b
JB		 673 txrc.sband = sband;
674 txrc.bss_conf = &tx->sdata->vif.bss_conf;
675 txrc.skb = tx->skb;
676 txrc.reported_rate.idx = -1;
2d56577b 677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
37eb0b16
JM		 678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
679 txrc.max_rate_idx = -1;
680 else
681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2ffbe6d3
FF		 682
683 if (tx->sdata->rc_has_mcs_mask[info->band])
684 txrc.rate_idx_mcs_mask =
685 tx->sdata->rc_rateidx_mcs_mask[info->band];
686
8f0729b1 687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
5765f9f6
BVB		 689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
690 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
e6a9854b
JB		 691
692 /* set up RTS protection if desired */
b9a5f8ca 693 if (len > tx->local->hw.wiphy->rts_threshold) {
0d528d85 694 txrc.rts = true;
e2ebc74d 695 }
e2ebc74d 696
0d528d85 697 info->control.use_rts = txrc.rts;
991fec09
FF		 698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
699
e6a9854b
JB		 700 /*
701 * Use short preamble if the BSS can handle it, but not for
702 * management frames unless we know the receiver can handle
703 * that -- the management frame might be to a station that
704 * just wants a probe response.
705 */
706 if (tx->sdata->vif.bss_conf.use_short_preamble &&
707 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
0d528d85
FF		 709 txrc.short_preamble = true;
710
711 info->control.short_preamble = txrc.short_preamble;
e2ebc74d 712
dfdfc2be
SE		 713 /* don't ask rate control when rate already injected via radiotap */
714 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
715 return TX_CONTINUE;
716
c2c98fde
JB		 717 if (tx->sta)
718 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 719
720 /*
721 * Lets not bother rate control if we're associated and cannot
722 * talk to the sta. This should not happen.
723 */
c2c98fde 724 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 725 !rate_usable_index_exists(sband, &tx->sta->sta),
726 "%s: Dropped data frame as no usable bitrate found while "
727 "scanning and associated. Target station: "
728 "%pM on %d GHz band\n",
47846c9b 729 tx->sdata->name, hdr->addr1,
2d56577b 730 info->band ? 5 : 2))
b770b43e 731 return TX_DROP;
2e92e6f2 732
b770b43e
LR		 733 /*
734 * If we're associated with the sta at this point we know we can at
735 * least send the frame at the lowest bit rate.
736 */
e6a9854b
JB		 737 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
738
0d528d85
FF		 739 if (tx->sta && !info->control.skip_table)
740 ratetbl = rcu_dereference(tx->sta->sta.rates);
741
742 if (unlikely(info->control.rates[0].idx < 0)) {
743 if (ratetbl) {
744 struct ieee80211_tx_rate rate = {
745 .idx = ratetbl->rate[0].idx,
746 .flags = ratetbl->rate[0].flags,
747 .count = ratetbl->rate[0].count
748 };
749
750 if (ratetbl->rate[0].idx < 0)
751 return TX_DROP;
752
753 tx->rate = rate;
754 } else {
755 return TX_DROP;
756 }
757 } else {
758 tx->rate = info->control.rates[0];
759 }
e6a9854b 760
c1ce5a74 761 if (txrc.reported_rate.idx < 0) {
0d528d85 762 txrc.reported_rate = tx->rate;
c1ce5a74 763 if (tx->sta && ieee80211_is_data(hdr->frame_control))
e5a9f8d0 764 tx->sta->tx_stats.last_rate = txrc.reported_rate;
c1ce5a74 765 } else if (tx->sta)
e5a9f8d0 766 tx->sta->tx_stats.last_rate = txrc.reported_rate;
e039fa4a 767
0d528d85
FF		 768 if (ratetbl)
769 return TX_CONTINUE;
770
e6a9854b
JB		 771 if (unlikely(!info->control.rates[0].count))
772 info->control.rates[0].count = 1;
e2ebc74d 773
9955151d
GS		 774 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
775 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
776 info->control.rates[0].count = 1;
777
e6a9854b
JB		 778 return TX_CONTINUE;
779}
780
ba8c3d6f
FF		 781static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
782{
783 u16 *seq = &sta->tid_seq[tid];
784 __le16 ret = cpu_to_le16(*seq);
785
786 /* Increase the sequence number. */
787 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
788
789 return ret;
790}
791
f591fa5d
JB		 792static ieee80211_tx_result debug_noinline
793ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
794{
795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
f591fa5d
JB		 797 u8 *qc;
798 int tid;
799
25d834e1
JB		 800 /*
801 * Packet injection may want to control the sequence
802 * number, if we have no matching interface then we
803 * neither assign one ourselves nor ask the driver to.
804 */
5061b0c2 805 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 806 return TX_CONTINUE;
807
f591fa5d
JB		 808 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
809 return TX_CONTINUE;
810
811 if (ieee80211_hdrlen(hdr->frame_control) < 24)
812 return TX_CONTINUE;
813
49a59543
JB		 814 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
815 return TX_CONTINUE;
816
94778280
JB		 817 /*
818 * Anything but QoS data that has a sequence number field
819 * (is long enough) gets a sequence number from the global
c4c205f3
BC		 820 * counter. QoS data frames with a multicast destination
821 * also use the global counter (802.11-2012 9.3.2.10).
94778280 822 */
c4c205f3
BC		 823 if (!ieee80211_is_data_qos(hdr->frame_control) ||
824 is_multicast_ether_addr(hdr->addr1)) {
94778280 825 /* driver should assign sequence number */
f591fa5d 826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 827 /* for pure STA mode without beacons, we can do it */
828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
829 tx->sdata->sequence_number += 0x10;
79c892b8 830 if (tx->sta)
e5a9f8d0 831 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
f591fa5d
JB		 832 return TX_CONTINUE;
833 }
834
835 /*
836 * This should be true for injected/management frames only, for
837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
838 * above since they are not QoS-data frames.
839 */
840 if (!tx->sta)
841 return TX_CONTINUE;
842
843 /* include per-STA, per-TID sequence counter */
844
845 qc = ieee80211_get_qos_ctl(hdr);
846 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
e5a9f8d0 847 tx->sta->tx_stats.msdu[tid]++;
f591fa5d 848
ba8c3d6f
FF		 849 if (!tx->sta->sta.txq[0])
850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
f591fa5d
JB		 851
852 return TX_CONTINUE;
853}
854
252b86c4 855static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 856 struct sk_buff *skb, int hdrlen,
857 int frag_threshold)
858{
252b86c4 859 struct ieee80211_local *local = tx->local;
a1a3fcec 860 struct ieee80211_tx_info *info;
252b86c4 861 struct sk_buff *tmp;
2de8e0d9
JB		 862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
865
866 if (WARN_ON(rem < 0))
867 return -EINVAL;
868
252b86c4
JB		 869 /* first fragment was already added to queue by caller */
870
2de8e0d9
JB		 871 while (rem) {
872 int fraglen = per_fragm;
873
874 if (fraglen > rem)
875 fraglen = rem;
876 rem -= fraglen;
877 tmp = dev_alloc_skb(local->tx_headroom +
878 frag_threshold +
2475b1cc 879 tx->sdata->encrypt_headroom +
2de8e0d9
JB		 880 IEEE80211_ENCRYPT_TAILROOM);
881 if (!tmp)
882 return -ENOMEM;
252b86c4
JB		 883
884 __skb_queue_tail(&tx->skbs, tmp);
885
2475b1cc
MS		 886 skb_reserve(tmp,
887 local->tx_headroom + tx->sdata->encrypt_headroom);
888
2de8e0d9
JB		 889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 891
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
895
896 if (rem)
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898
2de8e0d9
JB		 899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
2de8e0d9 901 tmp->dev = skb->dev;
2de8e0d9
JB		 902
903 /* copy header and data */
904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
906
907 pos += fraglen;
908 }
909
252b86c4 910 /* adjust first fragment's length */
338f977f 911 skb_trim(skb, hdrlen + per_fragm);
2de8e0d9
JB		 912 return 0;
913}
914
d9e8a70f 915static ieee80211_tx_result debug_noinline
e2454948
JB		 916ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917{
2de8e0d9
JB		 918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 922 int hdrlen;
923 int fragnum;
e2454948 924
252b86c4
JB		 925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
927 tx->skb = NULL;
928
a26eb27a
JB		 929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930 return TX_CONTINUE;
931
932 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 933 return TX_CONTINUE;
934
eefce91a
JB		 935 /*
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 937 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 938 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 939 */
8b30b1fe 940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 941 return TX_DROP;
942
065e9605 943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 944
a26eb27a 945 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 947 return TX_DROP;
e6a9854b 948
2de8e0d9
JB		 949 /*
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
956 */
252b86c4 957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 958 return TX_DROP;
e6a9854b 959
2de8e0d9
JB		 960 /* update duration/seq/flags of fragments */
961 fragnum = 0;
252b86c4
JB		 962
963 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 965
2de8e0d9
JB		 966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
e6a9854b 968
252b86c4 969 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 970 hdr->frame_control |= morefrags;
e6a9854b
JB		 971 /*
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
974 */
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
e3e1a0bc 978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 980 } else {
981 hdr->frame_control &= ~morefrags;
e6a9854b 982 }
2de8e0d9
JB		 983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
984 fragnum++;
252b86c4 985 }
e2ebc74d 986
9ae54c84 987 return TX_CONTINUE;
e2ebc74d
JB		 988}
989
feff1f2f
JB		 990static ieee80211_tx_result debug_noinline
991ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
992{
252b86c4 993 struct sk_buff *skb;
560d2682 994 int ac = -1;
feff1f2f
JB		 995
996 if (!tx->sta)
997 return TX_CONTINUE;
998
252b86c4 999 skb_queue_walk(&tx->skbs, skb) {
560d2682 1000 ac = skb_get_queue_mapping(skb);
e5a9f8d0 1001 tx->sta->tx_stats.bytes[ac] += skb->len;
252b86c4 1002 }
560d2682 1003 if (ac >= 0)
e5a9f8d0 1004 tx->sta->tx_stats.packets[ac]++;
feff1f2f
JB		 1005
1006 return TX_CONTINUE;
1007}
1008
d9e8a70f 1009static ieee80211_tx_result debug_noinline
e2454948
JB		 1010ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1011{
1012 if (!tx->key)
1013 return TX_CONTINUE;
1014
97359d12
JB		 1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1018 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1019 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1020 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1021 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx, IEEE80211_CCMP_MIC_LEN);
1024 case WLAN_CIPHER_SUITE_CCMP_256:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_256_MIC_LEN);
97359d12 1027 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1028 return ieee80211_crypto_aes_cmac_encrypt(tx);
56c52da2
JM		 1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
8ade538b
JM		 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx);
00b9cfa3
JM		 1034 case WLAN_CIPHER_SUITE_GCMP:
1035 case WLAN_CIPHER_SUITE_GCMP_256:
1036 return ieee80211_crypto_gcmp_encrypt(tx);
3ffc2a90 1037 default:
d32a1028 1038 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1039 }
1040
e2454948
JB		 1041 return TX_DROP;
1042}
1043
d9e8a70f 1044static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1045ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046{
252b86c4 1047 struct sk_buff *skb;
2de8e0d9
JB		 1048 struct ieee80211_hdr *hdr;
1049 int next_len;
1050 bool group_addr;
03f93c3d 1051
252b86c4 1052 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1053 hdr = (void *) skb->data;
7e0aae47
JM		 1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055 break; /* must not overwrite AID */
252b86c4
JB		 1056 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058 next_len = next->len;
1059 } else
1060 next_len = 0;
2de8e0d9 1061 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1062
2de8e0d9 1063 hdr->duration_id =
252b86c4
JB		 1064 ieee80211_duration(tx, skb, group_addr, next_len);
1065 }
03f93c3d
JB		 1066
1067 return TX_CONTINUE;
1068}
1069
e2ebc74d
JB		 1070/* actual transmit path */
1071
a622ab72
JB		 1072static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073 struct sk_buff *skb,
1074 struct ieee80211_tx_info *info,
1075 struct tid_ampdu_tx *tid_tx,
1076 int tid)
1077{
1078 bool queued = false;
285fa695 1079 bool reset_agg_timer = false;
aa454580 1080 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1081
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1084 reset_agg_timer = true;
0ab33703
JB		 1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086 /*
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1089 */
ba8c3d6f 1090 } else if (!tx->sta->sta.txq[tid]) {
a622ab72
JB		 1091 spin_lock(&tx->sta->lock);
1092 /*
1093 * Need to re-check now, because we may get here
1094 *
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1101 *
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1109 */
40b275b6 1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1111
1112 if (!tid_tx) {
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1116 reset_agg_timer = true;
a622ab72
JB		 1117 } else {
1118 queued = true;
f6d4671a
EG		 1119 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1120 clear_sta_flag(tx->sta, WLAN_STA_SP);
1121 ps_dbg(tx->sta->sdata,
1122 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1123 tx->sta->sta.addr, tx->sta->sta.aid);
1124 }
a622ab72
JB		 1125 info->control.vif = &tx->sdata->vif;
1126 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
facde7f3 1127 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
a622ab72 1128 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1129 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1130 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1131 }
1132 spin_unlock(&tx->sta->lock);
aa454580
HS		 1133
1134 if (purge_skb)
c3e7724b 1135 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1136 }
1137
285fa695
NM		 1138 /* reset session timer */
1139 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1140 tid_tx->last_tx = jiffies;
285fa695 1141
a622ab72
JB		 1142 return queued;
1143}
1144
58d4185e
JB		 1145/*
1146 * initialises @tx
7c10770f
JB		 1147 * pass %NULL for the station if unknown, a valid pointer if known
1148 * or an ERR_PTR() if the station is known not to exist
58d4185e 1149 */
9ae54c84 1150static ieee80211_tx_result
3b8d81e0
JB		 1151ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1152 struct ieee80211_tx_data *tx,
7c10770f 1153 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1154{
3b8d81e0 1155 struct ieee80211_local *local = sdata->local;
58d4185e 1156 struct ieee80211_hdr *hdr;
e039fa4a 1157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1158 int tid;
a622ab72 1159 u8 *qc;
e2ebc74d
JB		 1160
1161 memset(tx, 0, sizeof(*tx));
1162 tx->skb = skb;
e2ebc74d 1163 tx->local = local;
3b8d81e0 1164 tx->sdata = sdata;
252b86c4 1165 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1166
cd8ffc80
JB		 1167 /*
1168 * If this flag is set to true anywhere, and we get here,
1169 * we are doing the needed processing, so remove the flag
1170 * now.
1171 */
1172 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1173
58d4185e
JB		 1174 hdr = (struct ieee80211_hdr *) skb->data;
1175
7c10770f
JB		 1176 if (likely(sta)) {
1177 if (!IS_ERR(sta))
1178 tx->sta = sta;
1179 } else {
1180 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1181 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1182 if (!tx->sta && sdata->wdev.use_4addr)
1183 return TX_DROP;
1184 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1185 IEEE80211_TX_CTL_INJECTED) ||
1186 tx->sdata->control_port_protocol == tx->skb->protocol) {
1187 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1188 }
1189 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1190 tx->sta = sta_info_get(sdata, hdr->addr1);
3f0e0b22 1191 }
58d4185e 1192
cd8ffc80 1193 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1194 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
30686bf7
JB		 1195 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1196 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1197 struct tid_ampdu_tx *tid_tx;
1198
8b30b1fe
S		 1199 qc = ieee80211_get_qos_ctl(hdr);
1200 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1201
a622ab72
JB		 1202 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1203 if (tid_tx) {
1204 bool queued;
cd8ffc80 1205
a622ab72
JB		 1206 queued = ieee80211_tx_prep_agg(tx, skb, info,
1207 tid_tx, tid);
1208
1209 if (unlikely(queued))
1210 return TX_QUEUED;
1211 }
8b30b1fe
S		 1212 }
1213
badffb72 1214 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1215 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1216 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1217 } else
5cf121c3 1218 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1219
a26eb27a
JB		 1220 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1221 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1222 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1223 info->flags & IEEE80211_TX_CTL_AMPDU)
1224 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1225 }
1226
e2ebc74d 1227 if (!tx->sta)
e039fa4a 1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1 1229 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
e039fa4a 1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1
FF		 1231 ieee80211_check_fast_xmit(tx->sta);
1232 }
58d4185e 1233
e039fa4a 1234 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1235
9ae54c84 1236 return TX_CONTINUE;
e2ebc74d
JB		 1237}
1238
ba8c3d6f
FF		 1239static void ieee80211_drv_tx(struct ieee80211_local *local,
1240 struct ieee80211_vif *vif,
1241 struct ieee80211_sta *pubsta,
1242 struct sk_buff *skb)
1243{
1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1245 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1246 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1247 struct ieee80211_tx_control control = {
1248 .sta = pubsta,
1249 };
1250 struct ieee80211_txq *txq = NULL;
1251 struct txq_info *txqi;
1252 u8 ac;
1253
c3732a7b
FF		 1254 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1255 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
ba8c3d6f
FF		 1256 goto tx_normal;
1257
1258 if (!ieee80211_is_data(hdr->frame_control))
1259 goto tx_normal;
1260
1261 if (pubsta) {
1262 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1263
1264 txq = pubsta->txq[tid];
1265 } else if (vif) {
1266 txq = vif->txq;
1267 }
1268
1269 if (!txq)
1270 goto tx_normal;
1271
1272 ac = txq->ac;
1273 txqi = to_txq_info(txq);
1274 atomic_inc(&sdata->txqs_len[ac]);
1275 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1276 netif_stop_subqueue(sdata->dev, ac);
1277
f2ac7e30
MK		 1278 spin_lock_bh(&txqi->queue.lock);
1279 txqi->byte_cnt += skb->len;
1280 __skb_queue_tail(&txqi->queue, skb);
1281 spin_unlock_bh(&txqi->queue.lock);
1282
ba8c3d6f
FF		 1283 drv_wake_tx_queue(local, txqi);
1284
1285 return;
1286
1287tx_normal:
1288 drv_tx(local, &control, skb);
1289}
1290
1291struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1292 struct ieee80211_txq *txq)
1293{
1294 struct ieee80211_local *local = hw_to_local(hw);
1295 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1296 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1297 struct ieee80211_hdr *hdr;
1298 struct sk_buff *skb = NULL;
1299 u8 ac = txq->ac;
1300
1301 spin_lock_bh(&txqi->queue.lock);
1302
1303 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1304 goto out;
1305
1306 skb = __skb_dequeue(&txqi->queue);
1307 if (!skb)
1308 goto out;
1309
f2ac7e30
MK		 1310 txqi->byte_cnt -= skb->len;
1311
ba8c3d6f
FF		 1312 atomic_dec(&sdata->txqs_len[ac]);
1313 if (__netif_subqueue_stopped(sdata->dev, ac))
1314 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1315
1316 hdr = (struct ieee80211_hdr *)skb->data;
1317 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1318 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1319 sta);
1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1321
1322 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1323 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1324 info->flags |= IEEE80211_TX_CTL_AMPDU;
1325 else
1326 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1327 }
1328
1329out:
1330 spin_unlock_bh(&txqi->queue.lock);
1331
6e0456b5
FF		 1332 if (skb && skb_has_frag_list(skb) &&
1333 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST))
1334 skb_linearize(skb);
1335
ba8c3d6f
FF		 1336 return skb;
1337}
1338EXPORT_SYMBOL(ieee80211_tx_dequeue);
1339
11127e91
JB		 1340static bool ieee80211_tx_frags(struct ieee80211_local *local,
1341 struct ieee80211_vif *vif,
1342 struct ieee80211_sta *sta,
1343 struct sk_buff_head *skbs,
1344 bool txpending)
e2ebc74d 1345{
252b86c4 1346 struct sk_buff *skb, *tmp;
3b8d81e0 1347 unsigned long flags;
e2ebc74d 1348
252b86c4 1349 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1350 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1351 int q = info->hw_queue;
1352
1353#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1354 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1355 __skb_unlink(skb, skbs);
c3e7724b 1356 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1357 continue;
1358 }
1359#endif
3b8d81e0
JB		 1360
1361 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1362 if (local->queue_stop_reasons[q] ||
7bb45683 1363 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1364 if (unlikely(info->flags &
a7679ed5
SF		 1365 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1366 if (local->queue_stop_reasons[q] &
1367 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1368 /*
1369 * Drop off-channel frames if queues
1370 * are stopped for any reason other
1371 * than off-channel operation. Never
1372 * queue them.
1373 */
1374 spin_unlock_irqrestore(
1375 &local->queue_stop_reason_lock,
1376 flags);
1377 ieee80211_purge_tx_queue(&local->hw,
1378 skbs);
1379 return true;
1380 }
1381 } else {
1382
6c17b77b 1383 /*
a7679ed5
SF		 1384 * Since queue is stopped, queue up frames for
1385 * later transmission from the tx-pending
1386 * tasklet when the queue is woken again.
6c17b77b 1387 */
a7679ed5
SF		 1388 if (txpending)
1389 skb_queue_splice_init(skbs,
1390 &local->pending[q]);
1391 else
1392 skb_queue_splice_tail_init(skbs,
1393 &local->pending[q]);
1394
1395 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1396 flags);
1397 return false;
6c17b77b 1398 }
7bb45683 1399 }
3b8d81e0 1400 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1401
11127e91 1402 info->control.vif = vif;
f0e72851 1403
11127e91 1404 __skb_unlink(skb, skbs);
ba8c3d6f 1405 ieee80211_drv_tx(local, vif, sta, skb);
11127e91 1406 }
5061b0c2 1407
11127e91
JB		 1408 return true;
1409}
1410
1411/*
1412 * Returns false if the frame couldn't be transmitted but was queued instead.
1413 */
1414static bool __ieee80211_tx(struct ieee80211_local *local,
1415 struct sk_buff_head *skbs, int led_len,
1416 struct sta_info *sta, bool txpending)
1417{
1418 struct ieee80211_tx_info *info;
1419 struct ieee80211_sub_if_data *sdata;
1420 struct ieee80211_vif *vif;
1421 struct ieee80211_sta *pubsta;
1422 struct sk_buff *skb;
1423 bool result = true;
1424 __le16 fc;
5061b0c2 1425
11127e91
JB		 1426 if (WARN_ON(skb_queue_empty(skbs)))
1427 return true;
ec25acc4 1428
11127e91
JB		 1429 skb = skb_peek(skbs);
1430 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1431 info = IEEE80211_SKB_CB(skb);
1432 sdata = vif_to_sdata(info->control.vif);
1433 if (sta && !sta->uploaded)
1434 sta = NULL;
1435
1436 if (sta)
1437 pubsta = &sta->sta;
1438 else
1439 pubsta = NULL;
1440
1441 switch (sdata->vif.type) {
1442 case NL80211_IFTYPE_MONITOR:
c82b5a74
JB		 1443 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1444 vif = &sdata->vif;
1445 break;
1446 }
4b6f1dd6 1447 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1448 if (sdata) {
4b6f1dd6 1449 vif = &sdata->vif;
3a25a8c8
JB		 1450 info->hw_queue =
1451 vif->hw_queue[skb_get_queue_mapping(skb)];
30686bf7 1452 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
63b4d8b3 1453 ieee80211_purge_tx_queue(&local->hw, skbs);
3a25a8c8
JB		 1454 return true;
1455 } else
4b6f1dd6 1456 vif = NULL;
11127e91
JB		 1457 break;
1458 case NL80211_IFTYPE_AP_VLAN:
1459 sdata = container_of(sdata->bss,
1460 struct ieee80211_sub_if_data, u.ap);
1461 /* fall through */
1462 default:
1463 vif = &sdata->vif;
1464 break;
e2ebc74d 1465 }
2de8e0d9 1466
cb831b53
JB		 1467 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1468 txpending);
11127e91 1469
74e4dbfd 1470 ieee80211_tpt_led_trig_tx(local, fc, led_len);
74e4dbfd 1471
4db4e0a1 1472 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1473
11127e91 1474 return result;
e2ebc74d
JB		 1475}
1476
97b045d6
JB		 1477/*
1478 * Invoke TX handlers, return 0 on success and non-zero if the
1479 * frame was dropped or queued.
1480 */
1481static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1482{
252b86c4 1483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1484 ieee80211_tx_result res = TX_DROP;
97b045d6 1485
9aa4aee3
JB		 1486#define CALL_TXH(txh) \
1487 do { \
1488 res = txh(tx); \
1489 if (res != TX_CONTINUE) \
1490 goto txh_done; \
1491 } while (0)
1492
5c1b98a5 1493 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1494 CALL_TXH(ieee80211_tx_h_check_assoc);
1495 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1496 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1497 CALL_TXH(ieee80211_tx_h_select_key);
30686bf7 1498 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
af65cd96 1499 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1500
aa5b5492
JB		 1501 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1502 __skb_queue_tail(&tx->skbs, tx->skb);
1503 tx->skb = NULL;
c6fcf6bc 1504 goto txh_done;
aa5b5492 1505 }
c6fcf6bc
JB		 1506
1507 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1508 CALL_TXH(ieee80211_tx_h_sequence);
1509 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1510 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1511 CALL_TXH(ieee80211_tx_h_stats);
1512 CALL_TXH(ieee80211_tx_h_encrypt);
30686bf7 1513 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
8fd369ee 1514 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1515#undef CALL_TXH
97b045d6 1516
d9e8a70f 1517 txh_done:
97b045d6 1518 if (unlikely(res == TX_DROP)) {
5479d0e7 1519 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1520 if (tx->skb)
c3e7724b 1521 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1522 else
1f98ab7f 1523 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1524 return -1;
1525 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1526 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1527 return -1;
1528 }
1529
1530 return 0;
1531}
1532
06be6b14
FF		 1533bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1534 struct ieee80211_vif *vif, struct sk_buff *skb,
1535 int band, struct ieee80211_sta **sta)
1536{
1537 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1539 struct ieee80211_tx_data tx;
88724a81 1540 struct sk_buff *skb2;
06be6b14 1541
7c10770f 1542 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
06be6b14
FF		 1543 return false;
1544
1545 info->band = band;
1546 info->control.vif = vif;
1547 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1548
1549 if (invoke_tx_handlers(&tx))
1550 return false;
1551
1552 if (sta) {
1553 if (tx.sta)
1554 *sta = &tx.sta->sta;
1555 else
1556 *sta = NULL;
1557 }
1558
88724a81
JB		 1559 /* this function isn't suitable for fragmented data frames */
1560 skb2 = __skb_dequeue(&tx.skbs);
1561 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1562 ieee80211_free_txskb(hw, skb2);
1563 ieee80211_purge_tx_queue(hw, &tx.skbs);
1564 return false;
1565 }
1566
06be6b14
FF		 1567 return true;
1568}
1569EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1570
7bb45683
JB		 1571/*
1572 * Returns false if the frame couldn't be transmitted but was queued instead.
1573 */
1574static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
7c10770f
JB		 1575 struct sta_info *sta, struct sk_buff *skb,
1576 bool txpending)
e2ebc74d 1577{
3b8d81e0 1578 struct ieee80211_local *local = sdata->local;
5cf121c3 1579 struct ieee80211_tx_data tx;
97b045d6 1580 ieee80211_tx_result res_prepare;
e039fa4a 1581 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1582 bool result = true;
74e4dbfd 1583 int led_len;
e2ebc74d 1584
e2ebc74d
JB		 1585 if (unlikely(skb->len < 10)) {
1586 dev_kfree_skb(skb);
7bb45683 1587 return true;
e2ebc74d
JB		 1588 }
1589
58d4185e 1590 /* initialises tx */
74e4dbfd 1591 led_len = skb->len;
7c10770f 1592 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
e2ebc74d 1593
cd8ffc80 1594 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1595 ieee80211_free_txskb(&local->hw, skb);
55de908a 1596 return true;
cd8ffc80 1597 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1598 return true;
e2ebc74d
JB		 1599 }
1600
3a25a8c8
JB		 1601 /* set up hw_queue value early */
1602 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
30686bf7 1603 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3a25a8c8
JB		 1604 info->hw_queue =
1605 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1606
7bb45683 1607 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1608 result = __ieee80211_tx(local, &tx.skbs, led_len,
1609 tx.sta, txpending);
55de908a 1610
7bb45683 1611 return result;
e2ebc74d
JB		 1612}
1613
1614/* device xmit handlers */
1615
3bff1865 1616static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1617 struct sk_buff *skb,
1618 int head_need, bool may_encrypt)
1619{
3bff1865 1620 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1621 int tail_need = 0;
1622
3bff1865 1623 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1624 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1625 tail_need -= skb_tailroom(skb);
1626 tail_need = max_t(int, tail_need, 0);
1627 }
1628
c70f59a2 1629 if (skb_cloned(skb) &&
30686bf7 1630 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
c70f59a2 1631 !skb_clone_writable(skb, ETH_HLEN) ||
17c18bf8 1632 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
23c0752a 1633 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1634 else if (head_need || tail_need)
23c0752a 1635 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1636 else
1637 return 0;
23c0752a
JB		 1638
1639 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1640 wiphy_debug(local->hw.wiphy,
1641 "failed to reallocate TX buffer\n");
23c0752a
JB		 1642 return -ENOMEM;
1643 }
1644
23c0752a
JB		 1645 return 0;
1646}
1647
7c10770f
JB		 1648void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1649 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1650{
3b8d81e0 1651 struct ieee80211_local *local = sdata->local;
e039fa4a 1652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1653 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1654 int headroom;
23c0752a 1655 bool may_encrypt;
e2ebc74d 1656
3b8d81e0 1657 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1658
3b8d81e0 1659 headroom = local->tx_headroom;
23c0752a 1660 if (may_encrypt)
2475b1cc 1661 headroom += sdata->encrypt_headroom;
23c0752a
JB		 1662 headroom -= skb_headroom(skb);
1663 headroom = max_t(int, 0, headroom);
1664
3bff1865 1665 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1666 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1667 return;
e2ebc74d
JB		 1668 }
1669
740c1aa3 1670 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1671 info->control.vif = &sdata->vif;
e2ebc74d 1672
3f52b7e3
MP		 1673 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1674 if (ieee80211_is_data(hdr->frame_control) &&
1675 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1676 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1677 return; /* skb queued: don't free */
1678 } else {
1679 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1680 }
98aed9fd 1681 }
cca89496 1682
2154c81c 1683 ieee80211_set_qos_hdr(sdata, skb);
7c10770f 1684 ieee80211_tx(sdata, sta, skb, false);
e2ebc74d
JB		 1685}
1686
dfdfc2be
SE		 1687static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1688 struct sk_buff *skb)
73b9f03a
JB		 1689{
1690 struct ieee80211_radiotap_iterator iterator;
1691 struct ieee80211_radiotap_header *rthdr =
1692 (struct ieee80211_radiotap_header *) skb->data;
1693 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
dfdfc2be
SE		 1694 struct ieee80211_supported_band *sband =
1695 local->hw.wiphy->bands[info->band];
73b9f03a
JB		 1696 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1697 NULL);
1698 u16 txflags;
dfdfc2be
SE		 1699 u16 rate = 0;
1700 bool rate_found = false;
1701 u8 rate_retries = 0;
1702 u16 rate_flags = 0;
f66b60f6 1703 u8 mcs_known, mcs_flags, mcs_bw;
646e76bb
LB		 1704 u16 vht_known;
1705 u8 vht_mcs = 0, vht_nss = 0;
dfdfc2be 1706 int i;
73b9f03a
JB		 1707
1708 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1709 IEEE80211_TX_CTL_DONTFRAG;
1710
1711 /*
1712 * for every radiotap entry that is present
1713 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1714 * entries present, or -EINVAL on error)
1715 */
1716
1717 while (!ret) {
1718 ret = ieee80211_radiotap_iterator_next(&iterator);
1719
1720 if (ret)
1721 continue;
1722
1723 /* see if this argument is something we can use */
1724 switch (iterator.this_arg_index) {
1725 /*
1726 * You must take care when dereferencing iterator.this_arg
1727 * for multibyte types... the pointer is not aligned. Use
1728 * get_unaligned((type *)iterator.this_arg) to dereference
1729 * iterator.this_arg for type "type" safely on all arches.
1730 */
1731 case IEEE80211_RADIOTAP_FLAGS:
1732 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1733 /*
1734 * this indicates that the skb we have been
1735 * handed has the 32-bit FCS CRC at the end...
1736 * we should react to that by snipping it off
1737 * because it will be recomputed and added
1738 * on transmission
1739 */
1740 if (skb->len < (iterator._max_length + FCS_LEN))
1741 return false;
1742
1743 skb_trim(skb, skb->len - FCS_LEN);
1744 }
1745 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1746 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1747 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1748 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1749 break;
1750
1751 case IEEE80211_RADIOTAP_TX_FLAGS:
1752 txflags = get_unaligned_le16(iterator.this_arg);
1753 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1754 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1755 break;
1756
dfdfc2be
SE		 1757 case IEEE80211_RADIOTAP_RATE:
1758 rate = *iterator.this_arg;
1759 rate_flags = 0;
1760 rate_found = true;
1761 break;
1762
1763 case IEEE80211_RADIOTAP_DATA_RETRIES:
1764 rate_retries = *iterator.this_arg;
1765 break;
1766
1767 case IEEE80211_RADIOTAP_MCS:
1768 mcs_known = iterator.this_arg[0];
1769 mcs_flags = iterator.this_arg[1];
1770 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
1771 break;
1772
1773 rate_found = true;
1774 rate = iterator.this_arg[2];
1775 rate_flags = IEEE80211_TX_RC_MCS;
1776
1777 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
1778 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
1779 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1780
f66b60f6 1781 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
dfdfc2be 1782 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
f66b60f6 1783 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
dfdfc2be
SE		 1784 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1785 break;
1786
646e76bb
LB		 1787 case IEEE80211_RADIOTAP_VHT:
1788 vht_known = get_unaligned_le16(iterator.this_arg);
1789 rate_found = true;
1790
1791 rate_flags = IEEE80211_TX_RC_VHT_MCS;
1792 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
1793 (iterator.this_arg[2] &
1794 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
1795 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1796 if (vht_known &
1797 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
1798 if (iterator.this_arg[3] == 1)
1799 rate_flags |=
1800 IEEE80211_TX_RC_40_MHZ_WIDTH;
1801 else if (iterator.this_arg[3] == 4)
1802 rate_flags |=
1803 IEEE80211_TX_RC_80_MHZ_WIDTH;
1804 else if (iterator.this_arg[3] == 11)
1805 rate_flags |=
1806 IEEE80211_TX_RC_160_MHZ_WIDTH;
1807 }
1808
1809 vht_mcs = iterator.this_arg[4] >> 4;
1810 vht_nss = iterator.this_arg[4] & 0xF;
1811 break;
1812
73b9f03a
JB		 1813 /*
1814 * Please update the file
1815 * Documentation/networking/mac80211-injection.txt
1816 * when parsing new fields here.
1817 */
1818
1819 default:
1820 break;
1821 }
1822 }
1823
1824 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1825 return false;
1826
dfdfc2be
SE		 1827 if (rate_found) {
1828 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
1829
1830 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
1831 info->control.rates[i].idx = -1;
1832 info->control.rates[i].flags = 0;
1833 info->control.rates[i].count = 0;
1834 }
1835
1836 if (rate_flags & IEEE80211_TX_RC_MCS) {
1837 info->control.rates[0].idx = rate;
646e76bb
LB		 1838 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
1839 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
1840 vht_nss);
dfdfc2be
SE		 1841 } else {
1842 for (i = 0; i < sband->n_bitrates; i++) {
1843 if (rate * 5 != sband->bitrates[i].bitrate)
1844 continue;
1845
1846 info->control.rates[0].idx = i;
1847 break;
1848 }
1849 }
1850
07310a63
FF		 1851 if (info->control.rates[0].idx < 0)
1852 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
1853
dfdfc2be
SE		 1854 info->control.rates[0].flags = rate_flags;
1855 info->control.rates[0].count = min_t(u8, rate_retries + 1,
1856 local->hw.max_rate_tries);
1857 }
1858
73b9f03a
JB		 1859 /*
1860 * remove the radiotap header
1861 * iterator->_max_length was sanity-checked against
1862 * skb->len by iterator init
1863 */
1864 skb_pull(skb, iterator._max_length);
1865
1866 return true;
1867}
1868
d0cf9c0d
SH		 1869netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1870 struct net_device *dev)
e2ebc74d
JB		 1871{
1872 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a 1873 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d
JB		 1874 struct ieee80211_radiotap_header *prthdr =
1875 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1876 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1877 struct ieee80211_hdr *hdr;
5d9cf4a5 1878 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
b4932836 1879 struct cfg80211_chan_def *chandef;
9b8a74e3 1880 u16 len_rthdr;
5d9cf4a5 1881 int hdrlen;
e2ebc74d 1882
9b8a74e3
AG		 1883 /* check for not even having the fixed radiotap header part */
1884 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1885 goto fail; /* too short to be possibly valid */
1886
1887 /* is it a header version we can trust to find length from? */
1888 if (unlikely(prthdr->it_version))
1889 goto fail; /* only version 0 is supported */
1890
1891 /* then there must be a radiotap header with a length we can use */
1892 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1893
1894 /* does the skb contain enough to deliver on the alleged length? */
1895 if (unlikely(skb->len < len_rthdr))
1896 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1897
e2ebc74d
JB		 1898 /*
1899 * fix up the pointers accounting for the radiotap
1900 * header still being in there. We are being given
1901 * a precooked IEEE80211 header so no need for
1902 * normal processing
1903 */
9b8a74e3 1904 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1905 /*
9b8a74e3
AG		 1906 * these are just fixed to the end of the rt area since we
1907 * don't have any better information and at this point, nobody cares
e2ebc74d 1908 */
9b8a74e3
AG		 1909 skb_set_network_header(skb, len_rthdr);
1910 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1911
5d9cf4a5
JB		 1912 if (skb->len < len_rthdr + 2)
1913 goto fail;
1914
1915 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1916 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1917
1918 if (skb->len < len_rthdr + hdrlen)
1919 goto fail;
1920
f75f5c6f
HS		 1921 /*
1922 * Initialize skb->protocol if the injected frame is a data frame
1923 * carrying a rfc1042 header
1924 */
5d9cf4a5
JB		 1925 if (ieee80211_is_data(hdr->frame_control) &&
1926 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1927 u8 *payload = (u8 *)hdr + hdrlen;
1928
b203ca39 1929 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1930 skb->protocol = cpu_to_be16((payload[6] << 8) |
1931 payload[7]);
f75f5c6f
HS		 1932 }
1933
3b8d81e0
JB		 1934 memset(info, 0, sizeof(*info));
1935
5d9cf4a5 1936 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1937 IEEE80211_TX_CTL_INJECTED;
1938
5d9cf4a5
JB		 1939 rcu_read_lock();
1940
1941 /*
1942 * We process outgoing injected frames that have a local address
1943 * we handle as though they are non-injected frames.
1944 * This code here isn't entirely correct, the local MAC address
1945 * isn't always enough to find the interface to use; for proper
1946 * VLAN/WDS support we will need a different mechanism (which
1947 * likely isn't going to be monitor interfaces).
1948 */
1949 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1950
1951 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1952 if (!ieee80211_sdata_running(tmp_sdata))
1953 continue;
1954 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1955 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1956 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1957 continue;
b203ca39 1958 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1959 sdata = tmp_sdata;
1960 break;
1961 }
1962 }
7351c6bd 1963
55de908a
JB		 1964 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1965 if (!chanctx_conf) {
1966 tmp_sdata = rcu_dereference(local->monitor_sdata);
1967 if (tmp_sdata)
1968 chanctx_conf =
1969 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1970 }
55de908a 1971
b4a7ff75 1972 if (chanctx_conf)
b4932836 1973 chandef = &chanctx_conf->def;
b4a7ff75 1974 else if (!local->use_chanctx)
b4932836 1975 chandef = &local->_oper_chandef;
b4a7ff75
FF		 1976 else
1977 goto fail_rcu;
55de908a
JB		 1978
1979 /*
1980 * Frame injection is not allowed if beaconing is not allowed
1981 * or if we need radar detection. Beaconing is usually not allowed when
1982 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1983 * Passive scan is also used in world regulatory domains where
1984 * your country is not known and as such it should be treated as
1985 * NO TX unless the channel is explicitly allowed in which case
1986 * your current regulatory domain would not have the passive scan
1987 * flag.
1988 *
1989 * Since AP mode uses monitor interfaces to inject/TX management
1990 * frames we can make AP mode the exception to this rule once it
1991 * supports radar detection as its implementation can deal with
1992 * radar detection by itself. We can do that later by adding a
1993 * monitor flag interfaces used for AP support.
1994 */
b4932836
JD		 1995 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1996 sdata->vif.type))
55de908a
JB		 1997 goto fail_rcu;
1998
73c4e195 1999 info->band = chandef->chan->band;
109843b0
LB		 2000
2001 /* process and remove the injection radiotap header */
2002 if (!ieee80211_parse_tx_radiotap(local, skb))
2003 goto fail_rcu;
2004
7c10770f 2005 ieee80211_xmit(sdata, NULL, skb);
5d9cf4a5
JB		 2006 rcu_read_unlock();
2007
e2ebc74d 2008 return NETDEV_TX_OK;
9b8a74e3 2009
55de908a
JB		 2010fail_rcu:
2011 rcu_read_unlock();
9b8a74e3
AG		 2012fail:
2013 dev_kfree_skb(skb);
2014 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 2015}
2016
97ffe757 2017static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
ad38bfc9 2018{
97ffe757 2019 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
ad38bfc9 2020
97ffe757
JB		 2021 return ethertype == ETH_P_TDLS &&
2022 skb->len > 14 &&
2023 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2024}
2025
2026static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2027 struct sk_buff *skb,
2028 struct sta_info **sta_out)
2029{
2030 struct sta_info *sta;
2031
2032 switch (sdata->vif.type) {
2033 case NL80211_IFTYPE_AP_VLAN:
2034 sta = rcu_dereference(sdata->u.vlan.sta);
2035 if (sta) {
2036 *sta_out = sta;
2037 return 0;
2038 } else if (sdata->wdev.use_4addr) {
2039 return -ENOLINK;
2040 }
2041 /* fall through */
2042 case NL80211_IFTYPE_AP:
2043 case NL80211_IFTYPE_OCB:
2044 case NL80211_IFTYPE_ADHOC:
2045 if (is_multicast_ether_addr(skb->data)) {
2046 *sta_out = ERR_PTR(-ENOENT);
2047 return 0;
2048 }
2049 sta = sta_info_get_bss(sdata, skb->data);
2050 break;
2051 case NL80211_IFTYPE_WDS:
2052 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2053 break;
2054#ifdef CONFIG_MAC80211_MESH
2055 case NL80211_IFTYPE_MESH_POINT:
2056 /* determined much later */
2057 *sta_out = NULL;
2058 return 0;
2059#endif
2060 case NL80211_IFTYPE_STATION:
2061 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2062 sta = sta_info_get(sdata, skb->data);
2063 if (sta) {
2064 bool tdls_peer, tdls_auth;
2065
2066 tdls_peer = test_sta_flag(sta,
2067 WLAN_STA_TDLS_PEER);
2068 tdls_auth = test_sta_flag(sta,
2069 WLAN_STA_TDLS_PEER_AUTH);
2070
2071 if (tdls_peer && tdls_auth) {
2072 *sta_out = sta;
2073 return 0;
2074 }
2075
2076 /*
2077 * TDLS link during setup - throw out frames to
2078 * peer. Allow TDLS-setup frames to unauthorized
2079 * peers for the special case of a link teardown
2080 * after a TDLS sta is removed due to being
2081 * unreachable.
2082 */
2083 if (tdls_peer && !tdls_auth &&
2084 !ieee80211_is_tdls_setup(skb))
2085 return -EINVAL;
2086 }
2087
2088 }
2089
2090 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2091 if (!sta)
2092 return -ENOLINK;
2093 break;
2094 default:
2095 return -EINVAL;
2096 }
2097
2098 *sta_out = sta ?: ERR_PTR(-ENOENT);
2099 return 0;
ad38bfc9
MG		 2100}
2101
e2ebc74d 2102/**
4c9451ed
JB		 2103 * ieee80211_build_hdr - build 802.11 header in the given frame
2104 * @sdata: virtual interface to build the header for
2105 * @skb: the skb to build the header in
24d342c5 2106 * @info_flags: skb flags to set
e2ebc74d 2107 *
4c9451ed
JB		 2108 * This function takes the skb with 802.3 header and reformats the header to
2109 * the appropriate IEEE 802.11 header based on which interface the packet is
2110 * being transmitted on.
2111 *
2112 * Note that this function also takes care of the TX status request and
2113 * potential unsharing of the SKB - this needs to be interleaved with the
2114 * header building.
e2ebc74d 2115 *
4c9451ed
JB		 2116 * The function requires the read-side RCU lock held
2117 *
2118 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
e2ebc74d 2119 */
4c9451ed 2120static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
7c10770f 2121 struct sk_buff *skb, u32 info_flags,
97ffe757 2122 struct sta_info *sta)
e2ebc74d 2123{
133b8226 2124 struct ieee80211_local *local = sdata->local;
489ee919 2125 struct ieee80211_tx_info *info;
dcf33963 2126 int head_need;
065e9605
HH		 2127 u16 ethertype, hdrlen, meshhdrlen = 0;
2128 __le16 fc;
e2ebc74d 2129 struct ieee80211_hdr hdr;
ff67bb86 2130 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 2131 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 2132 const u8 *encaps_data;
2133 int encaps_len, skip_header_bytes;
e8bf9649 2134 int nh_pos, h_pos;
97ffe757
JB		 2135 bool wme_sta = false, authorized = false;
2136 bool tdls_peer;
a729cff8 2137 bool multicast;
a729cff8 2138 u16 info_id = 0;
55de908a
JB		 2139 struct ieee80211_chanctx_conf *chanctx_conf;
2140 struct ieee80211_sub_if_data *ap_sdata;
2141 enum ieee80211_band band;
4c9451ed 2142 int ret;
e2ebc74d 2143
97ffe757
JB		 2144 if (IS_ERR(sta))
2145 sta = NULL;
2146
e2ebc74d
JB		 2147 /* convert Ethernet header to proper 802.11 header (based on
2148 * operation mode) */
2149 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 2150 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 2151
51fb61e7 2152 switch (sdata->vif.type) {
05c914fe 2153 case NL80211_IFTYPE_AP_VLAN:
97ffe757 2154 if (sdata->wdev.use_4addr) {
f14543ee
FF		 2155 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2156 /* RA TA DA SA */
2157 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 2158 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2159 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2160 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2161 hdrlen = 30;
c2c98fde 2162 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
a74a8c84 2163 wme_sta = sta->sta.wme;
f14543ee 2164 }
55de908a
JB		 2165 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2166 u.ap);
2167 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
4c9451ed
JB		 2168 if (!chanctx_conf) {
2169 ret = -ENOTCONN;
2170 goto free;
2171 }
4bf88530 2172 band = chanctx_conf->def.chan->band;
97ffe757 2173 if (sdata->wdev.use_4addr)
f14543ee
FF		 2174 break;
2175 /* fall through */
2176 case NL80211_IFTYPE_AP:
fe80123d
AB		 2177 if (sdata->vif.type == NL80211_IFTYPE_AP)
2178 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2179 if (!chanctx_conf) {
2180 ret = -ENOTCONN;
2181 goto free;
2182 }
065e9605 2183 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 2184 /* DA BSSID SA */
2185 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 2186 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2187 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2188 hdrlen = 24;
4bf88530 2189 band = chanctx_conf->def.chan->band;
cf966838 2190 break;
05c914fe 2191 case NL80211_IFTYPE_WDS:
065e9605 2192 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 2193 /* RA TA DA SA */
2194 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 2195 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2196 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2197 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2198 hdrlen = 30;
55de908a
JB		 2199 /*
2200 * This is the exception! WDS style interfaces are prohibited
2201 * when channel contexts are in used so this must be valid
2202 */
675a0b04 2203 band = local->hw.conf.chandef.chan->band;
cf966838 2204 break;
33b64eb2 2205#ifdef CONFIG_MAC80211_MESH
05c914fe 2206 case NL80211_IFTYPE_MESH_POINT:
b8bacc18 2207 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 2208 struct sta_info *next_hop;
2209 bool mpp_lookup = true;
2210
bf7cd94d 2211 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 2212 if (mpath) {
2213 mpp_lookup = false;
2214 next_hop = rcu_dereference(mpath->next_hop);
2215 if (!next_hop ||
2216 !(mpath->flags & (MESH_PATH_ACTIVE |
2217 MESH_PATH_RESOLVING)))
2218 mpp_lookup = true;
2219 }
2220
ab1c7906 2221 if (mpp_lookup) {
bf7cd94d 2222 mppath = mpp_path_lookup(sdata, skb->data);
ab1c7906
HR		 2223 if (mppath)
2224 mppath->exp_time = jiffies;
2225 }
163df6cf
CYY		 2226
2227 if (mppath && mpath)
2bdaf386 2228 mesh_path_del(sdata, mpath->dst);
b8bacc18 2229 }
79617dee 2230
f76b57b4 2231 /*
9d52501b
JF		 2232 * Use address extension if it is a packet from
2233 * another interface or if we know the destination
2234 * is being proxied by a portal (i.e. portal address
2235 * differs from proxied address)
f76b57b4 2236 */
b203ca39
JP		 2237 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2238 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 2239 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2240 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 2241 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2242 NULL, NULL);
79617dee 2243 } else {
27f01124
TP		 2244 /* DS -> MBSS (802.11-2012 13.11.3.3).
2245 * For unicast with unknown forwarding information,
2246 * destination might be in the MBSS or if that fails
2247 * forwarded to another mesh gate. In either case
2248 * resolution will be handled in ieee80211_xmit(), so
2249 * leave the original DA. This also works for mcast */
2250 const u8 *mesh_da = skb->data;
2251
2252 if (mppath)
2253 mesh_da = mppath->mpp;
2254 else if (mpath)
2255 mesh_da = mpath->dst;
79617dee 2256
3c5772a5 2257 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 2258 mesh_da, sdata->vif.addr);
27f01124
TP		 2259 if (is_multicast_ether_addr(mesh_da))
2260 /* DA TA mSA AE:SA */
bf7cd94d
JB		 2261 meshhdrlen = ieee80211_new_mesh_header(
2262 sdata, &mesh_hdr,
2263 skb->data + ETH_ALEN, NULL);
3c5772a5 2264 else
27f01124 2265 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 2266 meshhdrlen = ieee80211_new_mesh_header(
2267 sdata, &mesh_hdr, skb->data,
2268 skb->data + ETH_ALEN);
79617dee 2269
79617dee 2270 }
55de908a 2271 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2272 if (!chanctx_conf) {
2273 ret = -ENOTCONN;
2274 goto free;
2275 }
4bf88530 2276 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 2277 break;
2278#endif
05c914fe 2279 case NL80211_IFTYPE_STATION:
97ffe757
JB		 2280 /* we already did checks when looking up the RA STA */
2281 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
941c93cd 2282
97ffe757 2283 if (tdls_peer) {
941c93cd
AN		 2284 /* DA SA BSSID */
2285 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2286 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2287 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2288 hdrlen = 24;
2289 } else if (sdata->u.mgd.use_4addr &&
2290 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2291 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2292 IEEE80211_FCTL_TODS);
f14543ee 2293 /* RA TA DA SA */
941c93cd 2294 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 2295 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2296 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2297 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2298 hdrlen = 30;
2299 } else {
2300 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2301 /* BSSID SA DA */
941c93cd 2302 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 2303 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2304 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2305 hdrlen = 24;
2306 }
55de908a 2307 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2308 if (!chanctx_conf) {
2309 ret = -ENOTCONN;
2310 goto free;
2311 }
4bf88530 2312 band = chanctx_conf->def.chan->band;
cf966838 2313 break;
239281f8
RL		 2314 case NL80211_IFTYPE_OCB:
2315 /* DA SA BSSID */
2316 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2317 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2318 eth_broadcast_addr(hdr.addr3);
2319 hdrlen = 24;
2320 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2321 if (!chanctx_conf) {
2322 ret = -ENOTCONN;
2323 goto free;
2324 }
239281f8
RL		 2325 band = chanctx_conf->def.chan->band;
2326 break;
05c914fe 2327 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 2328 /* DA SA BSSID */
2329 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2330 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 2331 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 2332 hdrlen = 24;
55de908a 2333 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2334 if (!chanctx_conf) {
2335 ret = -ENOTCONN;
2336 goto free;
2337 }
4bf88530 2338 band = chanctx_conf->def.chan->band;
cf966838
JB		 2339 break;
2340 default:
4c9451ed
JB		 2341 ret = -EINVAL;
2342 goto free;
e2ebc74d
JB		 2343 }
2344
a729cff8 2345 multicast = is_multicast_ether_addr(hdr.addr1);
e2ebc74d 2346
97ffe757
JB		 2347 /* sta is always NULL for mesh */
2348 if (sta) {
2349 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2350 wme_sta = sta->sta.wme;
2351 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2352 /* For mesh, the use of the QoS header is mandatory */
c2c98fde 2353 wme_sta = true;
97ffe757 2354 }
4777be41 2355
527871d7
JB		 2356 /* receiver does QoS (which also means we do) use it */
2357 if (wme_sta) {
065e9605 2358 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 2359 hdrlen += 2;
2360 }
2361
2362 /*
238814fd
JB		 2363 * Drop unicast frames to unauthorised stations unless they are
2364 * EAPOL frames from the local station.
ce3edf6d 2365 */
55182e4a 2366 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
239281f8 2367 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
a6ececf4 2368 !multicast && !authorized &&
55182e4a 2369 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 2370 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 2371#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 2372 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
4c9451ed 2373 sdata->name, hdr.addr1);
ce3edf6d
JB		 2374#endif
2375
2376 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2377
4c9451ed
JB		 2378 ret = -EPERM;
2379 goto free;
ce3edf6d
JB		 2380 }
2381
a729cff8
JB		 2382 if (unlikely(!multicast && skb->sk &&
2383 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
bf7fa551 2384 struct sk_buff *ack_skb = skb_clone_sk(skb);
a729cff8 2385
bf7fa551 2386 if (ack_skb) {
a729cff8 2387 unsigned long flags;
9475af6e 2388 int id;
a729cff8
JB		 2389
2390 spin_lock_irqsave(&local->ack_status_lock, flags);
bf7fa551 2391 id = idr_alloc(&local->ack_status_frames, ack_skb,
9475af6e 2392 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2393 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2394
9475af6e 2395 if (id >= 0) {
a729cff8
JB		 2396 info_id = id;
2397 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
a729cff8 2398 } else {
bf7fa551 2399 kfree_skb(ack_skb);
a729cff8 2400 }
a729cff8
JB		 2401 }
2402 }
2403
7e244707
HS		 2404 /*
2405 * If the skb is shared we need to obtain our own copy.
2406 */
2407 if (skb_shared(skb)) {
a729cff8
JB		 2408 struct sk_buff *tmp_skb = skb;
2409
2410 /* can't happen -- skb is a clone if info_id != 0 */
2411 WARN_ON(info_id);
2412
f8a0a781 2413 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2414 kfree_skb(tmp_skb);
2415
4c9451ed
JB		 2416 if (!skb) {
2417 ret = -ENOMEM;
2418 goto free;
2419 }
7e244707
HS		 2420 }
2421
065e9605 2422 hdr.frame_control = fc;
e2ebc74d
JB		 2423 hdr.duration_id = 0;
2424 hdr.seq_ctrl = 0;
2425
2426 skip_header_bytes = ETH_HLEN;
2427 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2428 encaps_data = bridge_tunnel_header;
2429 encaps_len = sizeof(bridge_tunnel_header);
2430 skip_header_bytes -= 2;
e5c5d22e 2431 } else if (ethertype >= ETH_P_802_3_MIN) {
e2ebc74d
JB		 2432 encaps_data = rfc1042_header;
2433 encaps_len = sizeof(rfc1042_header);
2434 skip_header_bytes -= 2;
2435 } else {
2436 encaps_data = NULL;
2437 encaps_len = 0;
2438 }
2439
7e244707
HS		 2440 nh_pos = skb_network_header(skb) - skb->data;
2441 h_pos = skb_transport_header(skb) - skb->data;
2442
e2ebc74d
JB		 2443 skb_pull(skb, skip_header_bytes);
2444 nh_pos -= skip_header_bytes;
2445 h_pos -= skip_header_bytes;
2446
23c0752a 2447 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2448
23c0752a
JB		 2449 /*
2450 * So we need to modify the skb header and hence need a copy of
2451 * that. The head_need variable above doesn't, so far, include
2452 * the needed header space that we don't need right away. If we
2453 * can, then we don't reallocate right now but only after the
2454 * frame arrives at the master device (if it does...)
2455 *
2456 * If we cannot, however, then we will reallocate to include all
2457 * the ever needed space. Also, if we need to reallocate it anyway,
2458 * make it big enough for everything we may ever need.
2459 */
e2ebc74d 2460
3a5be7d4 2461 if (head_need > 0 || skb_cloned(skb)) {
2475b1cc 2462 head_need += sdata->encrypt_headroom;
23c0752a
JB		 2463 head_need += local->tx_headroom;
2464 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2465 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2466 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2467 skb = NULL;
4c9451ed 2468 return ERR_PTR(-ENOMEM);
c3e7724b 2469 }
e2ebc74d
JB		 2470 }
2471
2472 if (encaps_data) {
2473 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2474 nh_pos += encaps_len;
2475 h_pos += encaps_len;
2476 }
c29b9b9b 2477
e4ab7eb0 2478#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2479 if (meshhdrlen > 0) {
2480 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2481 nh_pos += meshhdrlen;
2482 h_pos += meshhdrlen;
2483 }
e4ab7eb0 2484#endif
33b64eb2 2485
065e9605 2486 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2487 __le16 *qos_control;
2488
f359d3fe 2489 qos_control = (__le16 *) skb_push(skb, 2);
c29b9b9b
JB		 2490 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2491 /*
2492 * Maybe we could actually set some fields here, for now just
2493 * initialise to zero to indicate no special operation.
2494 */
2495 *qos_control = 0;
2496 } else
2497 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2498
e2ebc74d
JB		 2499 nh_pos += hdrlen;
2500 h_pos += hdrlen;
2501
e2ebc74d
JB		 2502 /* Update skb pointers to various headers since this modified frame
2503 * is going to go through Linux networking code that may potentially
2504 * need things like pointer to IP header. */
d57a544d 2505 skb_reset_mac_header(skb);
e2ebc74d
JB		 2506 skb_set_network_header(skb, nh_pos);
2507 skb_set_transport_header(skb, h_pos);
2508
489ee919 2509 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2510 memset(info, 0, sizeof(*info));
2511
a729cff8
JB		 2512 info->flags = info_flags;
2513 info->ack_frame_id = info_id;
73c4e195 2514 info->band = band;
a729cff8 2515
4c9451ed
JB		 2516 return skb;
2517 free:
2518 kfree_skb(skb);
2519 return ERR_PTR(ret);
2520}
2521
17c18bf8
JB		 2522/*
2523 * fast-xmit overview
2524 *
2525 * The core idea of this fast-xmit is to remove per-packet checks by checking
2526 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2527 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2528 * much less work can be done per packet. For example, fragmentation must be
2529 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2530 * in the code here.
2531 *
2532 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2533 * header and other data to aid packet processing in ieee80211_xmit_fast().
2534 *
2535 * The most difficult part of this is that when any of these assumptions
2536 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2537 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2538 * since the per-packet code no longer checks the conditions. This is reflected
2539 * by the calls to these functions throughout the rest of the code, and must be
2540 * maintained if any of the TX path checks change.
2541 */
2542
2543void ieee80211_check_fast_xmit(struct sta_info *sta)
2544{
2545 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2546 struct ieee80211_local *local = sta->local;
2547 struct ieee80211_sub_if_data *sdata = sta->sdata;
2548 struct ieee80211_hdr *hdr = (void *)build.hdr;
2549 struct ieee80211_chanctx_conf *chanctx_conf;
2550 __le16 fc;
2551
30686bf7 2552 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
17c18bf8
JB		 2553 return;
2554
2555 /* Locking here protects both the pointer itself, and against concurrent
2556 * invocations winning data access races to, e.g., the key pointer that
2557 * is used.
2558 * Without it, the invocation of this function right after the key
2559 * pointer changes wouldn't be sufficient, as another CPU could access
2560 * the pointer, then stall, and then do the cache update after the CPU
2561 * that invalidated the key.
2562 * With the locking, such scenarios cannot happen as the check for the
2563 * key and the fast-tx assignment are done atomically, so the CPU that
2564 * modifies the key will either wait or other one will see the key
2565 * cleared/changed already.
2566 */
2567 spin_lock_bh(&sta->lock);
30686bf7
JB		 2568 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2569 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
17c18bf8
JB		 2570 sdata->vif.type == NL80211_IFTYPE_STATION)
2571 goto out;
2572
2573 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2574 goto out;
2575
2576 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2577 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
f7418bc1
FF		 2578 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2579 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
17c18bf8
JB		 2580 goto out;
2581
2582 if (sdata->noack_map)
2583 goto out;
2584
2585 /* fast-xmit doesn't handle fragmentation at all */
725b812c
JB		 2586 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2587 !local->ops->set_frag_threshold)
17c18bf8
JB		 2588 goto out;
2589
2590 rcu_read_lock();
2591 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2592 if (!chanctx_conf) {
2593 rcu_read_unlock();
2594 goto out;
2595 }
2596 build.band = chanctx_conf->def.chan->band;
2597 rcu_read_unlock();
2598
2599 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2600
2601 switch (sdata->vif.type) {
3ffd8840
JB		 2602 case NL80211_IFTYPE_ADHOC:
2603 /* DA SA BSSID */
2604 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2605 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2606 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2607 build.hdr_len = 24;
2608 break;
17c18bf8
JB		 2609 case NL80211_IFTYPE_STATION:
2610 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2611 /* DA SA BSSID */
2612 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2613 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2614 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2615 build.hdr_len = 24;
2616 break;
2617 }
2618
2619 if (sdata->u.mgd.use_4addr) {
2620 /* non-regular ethertype cannot use the fastpath */
2621 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2622 IEEE80211_FCTL_TODS);
2623 /* RA TA DA SA */
2624 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2625 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2626 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2627 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2628 build.hdr_len = 30;
2629 break;
2630 }
2631 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2632 /* BSSID SA DA */
2633 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2634 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2635 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2636 build.hdr_len = 24;
2637 break;
2638 case NL80211_IFTYPE_AP_VLAN:
2639 if (sdata->wdev.use_4addr) {
2640 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2641 IEEE80211_FCTL_TODS);
2642 /* RA TA DA SA */
2643 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2644 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2645 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2646 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2647 build.hdr_len = 30;
2648 break;
2649 }
2650 /* fall through */
2651 case NL80211_IFTYPE_AP:
2652 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2653 /* DA BSSID SA */
2654 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2655 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2656 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2657 build.hdr_len = 24;
2658 break;
2659 default:
2660 /* not handled on fast-xmit */
2661 goto out;
2662 }
2663
2664 if (sta->sta.wme) {
2665 build.hdr_len += 2;
2666 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2667 }
2668
2669 /* We store the key here so there's no point in using rcu_dereference()
2670 * but that's fine because the code that changes the pointers will call
2671 * this function after doing so. For a single CPU that would be enough,
2672 * for multiple see the comment above.
2673 */
2674 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2675 if (!build.key)
2676 build.key = rcu_access_pointer(sdata->default_unicast_key);
2677 if (build.key) {
e495c247 2678 bool gen_iv, iv_spc, mmic;
17c18bf8
JB		 2679
2680 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2681 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
e495c247 2682 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
17c18bf8
JB		 2683
2684 /* don't handle software crypto */
2685 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2686 goto out;
2687
2688 switch (build.key->conf.cipher) {
2689 case WLAN_CIPHER_SUITE_CCMP:
2690 case WLAN_CIPHER_SUITE_CCMP_256:
2691 /* add fixed key ID */
2692 if (gen_iv) {
2693 (build.hdr + build.hdr_len)[3] =
2694 0x20 | (build.key->conf.keyidx << 6);
2695 build.pn_offs = build.hdr_len;
2696 }
2697 if (gen_iv || iv_spc)
2698 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2699 break;
2700 case WLAN_CIPHER_SUITE_GCMP:
2701 case WLAN_CIPHER_SUITE_GCMP_256:
2702 /* add fixed key ID */
2703 if (gen_iv) {
2704 (build.hdr + build.hdr_len)[3] =
2705 0x20 | (build.key->conf.keyidx << 6);
2706 build.pn_offs = build.hdr_len;
2707 }
2708 if (gen_iv || iv_spc)
2709 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2710 break;
e495c247
JB		 2711 case WLAN_CIPHER_SUITE_TKIP:
2712 /* cannot handle MMIC or IV generation in xmit-fast */
2713 if (mmic || gen_iv)
2714 goto out;
2715 if (iv_spc)
2716 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2717 break;
2718 case WLAN_CIPHER_SUITE_WEP40:
2719 case WLAN_CIPHER_SUITE_WEP104:
2720 /* cannot handle IV generation in fast-xmit */
2721 if (gen_iv)
2722 goto out;
2723 if (iv_spc)
2724 build.hdr_len += IEEE80211_WEP_IV_LEN;
2725 break;
2726 case WLAN_CIPHER_SUITE_AES_CMAC:
2727 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2728 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2729 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2730 WARN(1,
2731 "management cipher suite 0x%x enabled for data\n",
2732 build.key->conf.cipher);
17c18bf8 2733 goto out;
e495c247
JB		 2734 default:
2735 /* we don't know how to generate IVs for this at all */
2736 if (WARN_ON(gen_iv))
2737 goto out;
2738 /* pure hardware keys are OK, of course */
2739 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2740 break;
2741 /* cipher scheme might require space allocation */
2742 if (iv_spc &&
2743 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2744 goto out;
2745 if (iv_spc)
2746 build.hdr_len += build.key->conf.iv_len;
17c18bf8
JB		 2747 }
2748
2749 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2750 }
2751
2752 hdr->frame_control = fc;
2753
2754 memcpy(build.hdr + build.hdr_len,
2755 rfc1042_header, sizeof(rfc1042_header));
2756 build.hdr_len += sizeof(rfc1042_header);
2757
2758 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2759 /* if the kmemdup fails, continue w/o fast_tx */
2760 if (!fast_tx)
2761 goto out;
2762
2763 out:
2764 /* we might have raced against another call to this function */
2765 old = rcu_dereference_protected(sta->fast_tx,
2766 lockdep_is_held(&sta->lock));
2767 rcu_assign_pointer(sta->fast_tx, fast_tx);
2768 if (old)
2769 kfree_rcu(old, rcu_head);
2770 spin_unlock_bh(&sta->lock);
2771}
2772
2773void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2774{
2775 struct sta_info *sta;
2776
2777 rcu_read_lock();
2778 list_for_each_entry_rcu(sta, &local->sta_list, list)
2779 ieee80211_check_fast_xmit(sta);
2780 rcu_read_unlock();
2781}
2782
2783void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2784{
2785 struct ieee80211_local *local = sdata->local;
2786 struct sta_info *sta;
2787
2788 rcu_read_lock();
2789
2790 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2791 if (sdata != sta->sdata &&
2792 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2793 continue;
2794 ieee80211_check_fast_xmit(sta);
2795 }
2796
2797 rcu_read_unlock();
2798}
2799
2800void ieee80211_clear_fast_xmit(struct sta_info *sta)
2801{
2802 struct ieee80211_fast_tx *fast_tx;
2803
2804 spin_lock_bh(&sta->lock);
2805 fast_tx = rcu_dereference_protected(sta->fast_tx,
2806 lockdep_is_held(&sta->lock));
2807 RCU_INIT_POINTER(sta->fast_tx, NULL);
2808 spin_unlock_bh(&sta->lock);
2809
2810 if (fast_tx)
2811 kfree_rcu(fast_tx, rcu_head);
2812}
2813
6e0456b5
FF		 2814static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
2815 struct sk_buff *skb, int headroom,
2816 int *subframe_len)
2817{
2818 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
2819 int padding = (4 - amsdu_len) & 3;
2820
2821 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
2822 I802_DEBUG_INC(local->tx_expand_skb_head);
2823
2824 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
2825 wiphy_debug(local->hw.wiphy,
2826 "failed to reallocate TX buffer\n");
2827 return false;
2828 }
2829 }
2830
2831 if (padding) {
2832 *subframe_len += padding;
2833 memset(skb_put(skb, padding), 0, padding);
2834 }
2835
2836 return true;
2837}
2838
2839static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
2840 struct ieee80211_fast_tx *fast_tx,
2841 struct sk_buff *skb)
2842{
2843 struct ieee80211_local *local = sdata->local;
2844 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2845 struct ieee80211_hdr *hdr;
2846 struct ethhdr amsdu_hdr;
2847 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
2848 int subframe_len = skb->len - hdr_len;
2849 void *data;
2850 u8 *qc;
2851
2852 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
2853 return false;
2854
2855 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
2856 return true;
2857
2858 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr),
2859 &subframe_len))
2860 return false;
2861
2862 amsdu_hdr.h_proto = cpu_to_be16(subframe_len);
2863 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN);
2864 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN);
2865
2866 data = skb_push(skb, sizeof(amsdu_hdr));
2867 memmove(data, data + sizeof(amsdu_hdr), hdr_len);
2868 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
2869
2870 hdr = data;
2871 qc = ieee80211_get_qos_ctl(hdr);
2872 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
2873
2874 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
2875
2876 return true;
2877}
2878
2879static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
2880 struct sta_info *sta,
2881 struct ieee80211_fast_tx *fast_tx,
2882 struct sk_buff *skb)
2883{
2884 struct ieee80211_local *local = sdata->local;
2885 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2886 struct ieee80211_txq *txq = sta->sta.txq[tid];
2887 struct txq_info *txqi;
2888 struct sk_buff **frag_tail, *head;
2889 int subframe_len = skb->len - ETH_ALEN;
2890 u8 max_subframes = sta->sta.max_amsdu_subframes;
2891 int max_frags = local->hw.max_tx_fragments;
2892 int max_amsdu_len = sta->sta.max_amsdu_len;
2893 __be16 len;
2894 void *data;
2895 bool ret = false;
2896 int n = 1, nfrags;
2897
2898 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
2899 return false;
2900
2901 if (!txq)
2902 return false;
2903
2904 txqi = to_txq_info(txq);
2905 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
2906 return false;
2907
2908 if (sta->sta.max_rc_amsdu_len)
2909 max_amsdu_len = min_t(int, max_amsdu_len,
2910 sta->sta.max_rc_amsdu_len);
2911
2912 spin_lock_bh(&txqi->queue.lock);
2913
2914 head = skb_peek_tail(&txqi->queue);
2915 if (!head)
2916 goto out;
2917
2918 if (skb->len + head->len > max_amsdu_len)
2919 goto out;
2920
2921 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
2922 goto out;
2923
2924 nfrags = 1 + skb_shinfo(skb)->nr_frags;
2925 nfrags += 1 + skb_shinfo(head)->nr_frags;
2926 frag_tail = &skb_shinfo(head)->frag_list;
2927 while (*frag_tail) {
2928 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
2929 frag_tail = &(*frag_tail)->next;
2930 n++;
2931 }
2932
2933 if (max_subframes && n > max_subframes)
2934 goto out;
2935
2936 if (max_frags && nfrags > max_frags)
2937 goto out;
2938
2939 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
2940 &subframe_len))
2941 goto out;
2942
2943 ret = true;
2944 data = skb_push(skb, ETH_ALEN + 2);
2945 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
2946
2947 data += 2 * ETH_ALEN;
2948 len = cpu_to_be16(subframe_len);
2949 memcpy(data, &len, 2);
2950 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
2951
2952 head->len += skb->len;
2953 head->data_len += skb->len;
2954 *frag_tail = skb;
2955
2956out:
2957 spin_unlock_bh(&txqi->queue.lock);
2958
2959 return ret;
2960}
2961
17c18bf8
JB		 2962static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2963 struct net_device *dev, struct sta_info *sta,
2964 struct ieee80211_fast_tx *fast_tx,
2965 struct sk_buff *skb)
2966{
2967 struct ieee80211_local *local = sdata->local;
2968 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2969 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2970 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2971 struct ethhdr eth;
2972 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2973 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2974 struct ieee80211_tx_data tx;
2975 ieee80211_tx_result r;
2976 struct tid_ampdu_tx *tid_tx = NULL;
2977 u8 tid = IEEE80211_NUM_TIDS;
2978
2979 /* control port protocol needs a lot of special handling */
2980 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2981 return false;
2982
2983 /* only RFC 1042 SNAP */
2984 if (ethertype < ETH_P_802_3_MIN)
2985 return false;
2986
2987 /* don't handle TX status request here either */
2988 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2989 return false;
2990
2991 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2992 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2993 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
472be00d
JB		 2994 if (tid_tx) {
2995 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2996 return false;
2997 if (tid_tx->timeout)
2998 tid_tx->last_tx = jiffies;
2999 }
17c18bf8
JB		 3000 }
3001
3002 /* after this point (skb is modified) we cannot return false */
3003
3004 if (skb_shared(skb)) {
3005 struct sk_buff *tmp_skb = skb;
3006
3007 skb = skb_clone(skb, GFP_ATOMIC);
3008 kfree_skb(tmp_skb);
3009
3010 if (!skb)
3011 return true;
3012 }
3013
5a490510 3014 ieee80211_tx_stats(dev, skb->len + extra_head);
17c18bf8 3015
6e0456b5
FF		 3016 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3017 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3018 return true;
3019
17c18bf8
JB		 3020 /* will not be crypto-handled beyond what we do here, so use false
3021 * as the may-encrypt argument for the resize to not account for
3022 * more room than we already have in 'extra_head'
3023 */
3024 if (unlikely(ieee80211_skb_resize(sdata, skb,
3025 max_t(int, extra_head + hw_headroom -
3026 skb_headroom(skb), 0),
3027 false))) {
3028 kfree_skb(skb);
3029 return true;
3030 }
3031
3032 memcpy(&eth, skb->data, ETH_HLEN - 2);
3033 hdr = (void *)skb_push(skb, extra_head);
3034 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3035 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3036 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3037
3038 memset(info, 0, sizeof(*info));
3039 info->band = fast_tx->band;
3040 info->control.vif = &sdata->vif;
3041 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3042 IEEE80211_TX_CTL_DONTFRAG |
3043 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3044
3045 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3046 *ieee80211_get_qos_ctl(hdr) = tid;
50f36ae6
FF		 3047 if (!sta->sta.txq[0])
3048 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
17c18bf8
JB		 3049 } else {
3050 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3051 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3052 sdata->sequence_number += 0x10;
3053 }
3054
ccc6bb96 3055 if (skb_shinfo(skb)->gso_size)
e5a9f8d0 3056 sta->tx_stats.msdu[tid] +=
ccc6bb96
JB		 3057 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3058 else
e5a9f8d0 3059 sta->tx_stats.msdu[tid]++;
17c18bf8
JB		 3060
3061 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3062
3063 __skb_queue_head_init(&tx.skbs);
3064
3065 tx.flags = IEEE80211_TX_UNICAST;
3066 tx.local = local;
3067 tx.sdata = sdata;
3068 tx.sta = sta;
3069 tx.key = fast_tx->key;
3070
3071 if (fast_tx->key)
3072 info->control.hw_key = &fast_tx->key->conf;
3073
30686bf7 3074 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
17c18bf8
JB		 3075 tx.skb = skb;
3076 r = ieee80211_tx_h_rate_ctrl(&tx);
3077 skb = tx.skb;
3078 tx.skb = NULL;
3079
3080 if (r != TX_CONTINUE) {
3081 if (r != TX_QUEUED)
3082 kfree_skb(skb);
3083 return true;
3084 }
3085 }
3086
3087 /* statistics normally done by ieee80211_tx_h_stats (but that
3088 * has to consider fragmentation, so is more complex)
3089 */
e5a9f8d0
JB		 3090 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3091 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
17c18bf8
JB		 3092
3093 if (fast_tx->pn_offs) {
3094 u64 pn;
3095 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
3096
3097 switch (fast_tx->key->conf.cipher) {
3098 case WLAN_CIPHER_SUITE_CCMP:
3099 case WLAN_CIPHER_SUITE_CCMP_256:
17c18bf8
JB		 3100 case WLAN_CIPHER_SUITE_GCMP:
3101 case WLAN_CIPHER_SUITE_GCMP_256:
db388a56 3102 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
17c18bf8
JB		 3103 crypto_hdr[0] = pn;
3104 crypto_hdr[1] = pn >> 8;
3105 crypto_hdr[4] = pn >> 16;
3106 crypto_hdr[5] = pn >> 24;
3107 crypto_hdr[6] = pn >> 32;
3108 crypto_hdr[7] = pn >> 40;
3109 break;
3110 }
3111 }
3112
3113 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3114 sdata = container_of(sdata->bss,
3115 struct ieee80211_sub_if_data, u.ap);
3116
3117 __skb_queue_tail(&tx.skbs, skb);
3118 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3119 return true;
3120}
3121
4c9451ed
JB		 3122void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3123 struct net_device *dev,
3124 u32 info_flags)
3125{
3126 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
97ffe757 3127 struct sta_info *sta;
80616c0d 3128 struct sk_buff *next;
4c9451ed
JB		 3129
3130 if (unlikely(skb->len < ETH_HLEN)) {
3131 kfree_skb(skb);
3132 return;
3133 }
3134
3135 rcu_read_lock();
e2ebc74d 3136
2d981fdd
JB		 3137 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3138 goto out_free;
4c9451ed 3139
17c18bf8
JB		 3140 if (!IS_ERR_OR_NULL(sta)) {
3141 struct ieee80211_fast_tx *fast_tx;
3142
3143 fast_tx = rcu_dereference(sta->fast_tx);
3144
3145 if (fast_tx &&
3146 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
3147 goto out;
3148 }
3149
80616c0d
JB		 3150 if (skb_is_gso(skb)) {
3151 struct sk_buff *segs;
680a0dab 3152
80616c0d
JB		 3153 segs = skb_gso_segment(skb, 0);
3154 if (IS_ERR(segs)) {
2d981fdd 3155 goto out_free;
80616c0d
JB		 3156 } else if (segs) {
3157 consume_skb(skb);
3158 skb = segs;
3159 }
3160 } else {
3161 /* we cannot process non-linear frames on this path */
3162 if (skb_linearize(skb)) {
3163 kfree_skb(skb);
3164 goto out;
3165 }
3166
3167 /* the frame could be fragmented, software-encrypted, and other
3168 * things so we cannot really handle checksum offload with it -
3169 * fix it up in software before we handle anything else.
3170 */
3171 if (skb->ip_summed == CHECKSUM_PARTIAL) {
f603f1f3
JB		 3172 skb_set_transport_header(skb,
3173 skb_checksum_start_offset(skb));
80616c0d
JB		 3174 if (skb_checksum_help(skb))
3175 goto out_free;
3176 }
2d981fdd
JB		 3177 }
3178
80616c0d
JB		 3179 next = skb;
3180 while (next) {
3181 skb = next;
3182 next = skb->next;
4c9451ed 3183
80616c0d
JB		 3184 skb->prev = NULL;
3185 skb->next = NULL;
3186
3187 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3188 if (IS_ERR(skb))
3189 goto out;
e2ebc74d 3190
5a490510 3191 ieee80211_tx_stats(dev, skb->len);
80616c0d
JB		 3192
3193 ieee80211_xmit(sdata, sta, skb);
3194 }
2d981fdd
JB		 3195 goto out;
3196 out_free:
3197 kfree_skb(skb);
4c9451ed 3198 out:
55de908a 3199 rcu_read_unlock();
e2ebc74d
JB		 3200}
3201
4c9451ed
JB		 3202/**
3203 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3204 * @skb: packet to be sent
3205 * @dev: incoming interface
3206 *
3207 * On failure skb will be freed.
3208 */
24d342c5
LK		 3209netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3210 struct net_device *dev)
3211{
3212 __ieee80211_subif_start_xmit(skb, dev, 0);
3213 return NETDEV_TX_OK;
3214}
e2ebc74d 3215
7528ec57
JB		 3216struct sk_buff *
3217ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3218 struct sk_buff *skb, u32 info_flags)
3219{
3220 struct ieee80211_hdr *hdr;
3221 struct ieee80211_tx_data tx = {
3222 .local = sdata->local,
3223 .sdata = sdata,
3224 };
97ffe757 3225 struct sta_info *sta;
7528ec57
JB		 3226
3227 rcu_read_lock();
3228
97ffe757
JB		 3229 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3230 kfree_skb(skb);
3231 skb = ERR_PTR(-EINVAL);
3232 goto out;
3233 }
3234
3235 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
7528ec57
JB		 3236 if (IS_ERR(skb))
3237 goto out;
3238
3239 hdr = (void *)skb->data;
3240 tx.sta = sta_info_get(sdata, hdr->addr1);
3241 tx.skb = skb;
3242
3243 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3244 rcu_read_unlock();
3245 kfree_skb(skb);
3246 return ERR_PTR(-EINVAL);
3247 }
3248
3249out:
3250 rcu_read_unlock();
3251 return skb;
3252}
3253
e2530083
JB		 3254/*
3255 * ieee80211_clear_tx_pending may not be called in a context where
3256 * it is possible that it packets could come in again.
3257 */
e2ebc74d
JB		 3258void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3259{
1f98ab7f 3260 struct sk_buff *skb;
2de8e0d9 3261 int i;
e2ebc74d 3262
1f98ab7f
FF		 3263 for (i = 0; i < local->hw.queues; i++) {
3264 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3265 ieee80211_free_txskb(&local->hw, skb);
3266 }
e2ebc74d
JB		 3267}
3268
7bb45683
JB		 3269/*
3270 * Returns false if the frame couldn't be transmitted but was queued instead,
3271 * which in this case means re-queued -- take as an indication to stop sending
3272 * more pending frames.
3273 */
cd8ffc80
JB		 3274static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3275 struct sk_buff *skb)
3276{
3277 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3278 struct ieee80211_sub_if_data *sdata;
3279 struct sta_info *sta;
3280 struct ieee80211_hdr *hdr;
7bb45683 3281 bool result;
55de908a 3282 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 3283
5061b0c2 3284 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 3285
3286 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 3287 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3288 if (unlikely(!chanctx_conf)) {
3289 dev_kfree_skb(skb);
3290 return true;
3291 }
73c4e195 3292 info->band = chanctx_conf->def.chan->band;
7c10770f 3293 result = ieee80211_tx(sdata, NULL, skb, true);
cd8ffc80 3294 } else {
252b86c4
JB		 3295 struct sk_buff_head skbs;
3296
3297 __skb_queue_head_init(&skbs);
3298 __skb_queue_tail(&skbs, skb);
3299
cd8ffc80 3300 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 3301 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 3302
74e4dbfd 3303 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 3304 }
3305
cd8ffc80
JB		 3306 return result;
3307}
3308
e2530083 3309/*
3b8d81e0 3310 * Transmit all pending packets. Called from tasklet.
e2530083 3311 */
e2ebc74d
JB		 3312void ieee80211_tx_pending(unsigned long data)
3313{
3314 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 3315 unsigned long flags;
cd8ffc80 3316 int i;
3b8d81e0 3317 bool txok;
e2ebc74d 3318
f0e72851 3319 rcu_read_lock();
e2530083 3320
3b8d81e0 3321 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 3322 for (i = 0; i < local->hw.queues; i++) {
3323 /*
3324 * If queue is stopped by something other than due to pending
3325 * frames, or we have no pending frames, proceed to next queue.
3326 */
3b8d81e0 3327 if (local->queue_stop_reasons[i] ||
2a577d98 3328 skb_queue_empty(&local->pending[i]))
e2ebc74d 3329 continue;
e2530083 3330
2a577d98 3331 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 3332 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 3333 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 3334
a7bc376c 3335 if (WARN_ON(!info->control.vif)) {
c3e7724b 3336 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 3337 continue;
3338 }
3339
3b8d81e0
JB		 3340 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3341 flags);
3342
3343 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 3344 spin_lock_irqsave(&local->queue_stop_reason_lock,
3345 flags);
3346 if (!txok)
2a577d98 3347 break;
e2ebc74d 3348 }
7236fe29
JB		 3349
3350 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 3351 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 3352 }
3b8d81e0 3353 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 3354
f0e72851 3355 rcu_read_unlock();
e2ebc74d
JB		 3356}
3357
3358/* functions for drivers to get certain frames */
3359
eac70c13 3360static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3361 struct ps_data *ps, struct sk_buff *skb,
3362 bool is_template)
e2ebc74d
JB		 3363{
3364 u8 *pos, *tim;
3365 int aid0 = 0;
3366 int i, have_bits = 0, n1, n2;
3367
3368 /* Generate bitmap for TIM only if there are any STAs in power save
3369 * mode. */
d012a605 3370 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 3371 /* in the hope that this is faster than
3372 * checking byte-for-byte */
f359d3fe 3373 have_bits = !bitmap_empty((unsigned long *)ps->tim,
e2ebc74d 3374 IEEE80211_MAX_AID+1);
6ec8c332
AO		 3375 if (!is_template) {
3376 if (ps->dtim_count == 0)
3377 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3378 else
3379 ps->dtim_count--;
3380 }
e2ebc74d
JB		 3381
3382 tim = pos = (u8 *) skb_put(skb, 6);
3383 *pos++ = WLAN_EID_TIM;
3384 *pos++ = 4;
d012a605 3385 *pos++ = ps->dtim_count;
8860020e 3386 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 3387
d012a605 3388 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 3389 aid0 = 1;
3390
d012a605 3391 ps->dtim_bc_mc = aid0 == 1;
512119b3 3392
e2ebc74d
JB		 3393 if (have_bits) {
3394 /* Find largest even number N1 so that bits numbered 1 through
3395 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3396 * (N2 + 1) x 8 through 2007 are 0. */
3397 n1 = 0;
3398 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 3399 if (ps->tim[i]) {
e2ebc74d
JB		 3400 n1 = i & 0xfe;
3401 break;
3402 }
3403 }
3404 n2 = n1;
3405 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 3406 if (ps->tim[i]) {
e2ebc74d
JB		 3407 n2 = i;
3408 break;
3409 }
3410 }
3411
3412 /* Bitmap control */
3413 *pos++ = n1 | aid0;
3414 /* Part Virt Bitmap */
5220da39 3415 skb_put(skb, n2 - n1);
d012a605 3416 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 3417
3418 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 3419 } else {
3420 *pos++ = aid0; /* Bitmap control */
3421 *pos++ = 0; /* Part Virt Bitmap */
3422 }
e2ebc74d
JB		 3423}
3424
eac70c13 3425static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3426 struct ps_data *ps, struct sk_buff *skb,
3427 bool is_template)
eac70c13
MP		 3428{
3429 struct ieee80211_local *local = sdata->local;
3430
3431 /*
3432 * Not very nice, but we want to allow the driver to call
3433 * ieee80211_beacon_get() as a response to the set_tim()
3434 * callback. That, however, is already invoked under the
3435 * sta_lock to guarantee consistent and race-free update
3436 * of the tim bitmap in mac80211 and the driver.
3437 */
3438 if (local->tim_in_locked_section) {
6ec8c332 3439 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
eac70c13 3440 } else {
1b91731d 3441 spin_lock_bh(&local->tim_lock);
6ec8c332 3442 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
1b91731d 3443 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 3444 }
3445
3446 return 0;
3447}
3448
1af586c9
AO		 3449static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3450 struct beacon_data *beacon)
73da7d5b
SW		 3451{
3452 struct probe_resp *resp;
cd7760e6
SW		 3453 u8 *beacon_data;
3454 size_t beacon_data_len;
0d06d9ba 3455 int i;
af296bdb 3456 u8 count = beacon->csa_current_counter;
cd7760e6
SW		 3457
3458 switch (sdata->vif.type) {
3459 case NL80211_IFTYPE_AP:
3460 beacon_data = beacon->tail;
3461 beacon_data_len = beacon->tail_len;
3462 break;
3463 case NL80211_IFTYPE_ADHOC:
3464 beacon_data = beacon->head;
3465 beacon_data_len = beacon->head_len;
3466 break;
b8456a14
CYY		 3467 case NL80211_IFTYPE_MESH_POINT:
3468 beacon_data = beacon->head;
3469 beacon_data_len = beacon->head_len;
3470 break;
cd7760e6
SW		 3471 default:
3472 return;
3473 }
73da7d5b 3474
af296bdb 3475 rcu_read_lock();
0d06d9ba 3476 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
af296bdb 3477 resp = rcu_dereference(sdata->u.ap.probe_resp);
0d06d9ba 3478
af296bdb
MK		 3479 if (beacon->csa_counter_offsets[i]) {
3480 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3481 beacon_data_len)) {
0d06d9ba
AO		 3482 rcu_read_unlock();
3483 return;
3484 }
af296bdb
MK		 3485
3486 beacon_data[beacon->csa_counter_offsets[i]] = count;
73da7d5b 3487 }
af296bdb
MK		 3488
3489 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3490 resp->data[resp->csa_counter_offsets[i]] = count;
73da7d5b 3491 }
af296bdb 3492 rcu_read_unlock();
1af586c9
AO		 3493}
3494
e996ec2a
WD		 3495static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3496{
3497 beacon->csa_current_counter--;
3498
3499 /* the counter should never reach 0 */
3500 WARN_ON_ONCE(!beacon->csa_current_counter);
3501
3502 return beacon->csa_current_counter;
3503}
3504
1af586c9
AO		 3505u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3506{
3507 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
af296bdb
MK		 3508 struct beacon_data *beacon = NULL;
3509 u8 count = 0;
0d06d9ba 3510
af296bdb
MK		 3511 rcu_read_lock();
3512
3513 if (sdata->vif.type == NL80211_IFTYPE_AP)
3514 beacon = rcu_dereference(sdata->u.ap.beacon);
3515 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3516 beacon = rcu_dereference(sdata->u.ibss.presp);
3517 else if (ieee80211_vif_is_mesh(&sdata->vif))
3518 beacon = rcu_dereference(sdata->u.mesh.beacon);
3519
3520 if (!beacon)
3521 goto unlock;
3522
e996ec2a 3523 count = __ieee80211_csa_update_counter(beacon);
1af586c9 3524
af296bdb
MK		 3525unlock:
3526 rcu_read_unlock();
3527 return count;
73da7d5b 3528}
1af586c9 3529EXPORT_SYMBOL(ieee80211_csa_update_counter);
73da7d5b
SW		 3530
3531bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3532{
3533 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3534 struct beacon_data *beacon = NULL;
3535 u8 *beacon_data;
3536 size_t beacon_data_len;
73da7d5b
SW		 3537 int ret = false;
3538
3539 if (!ieee80211_sdata_running(sdata))
3540 return false;
3541
3542 rcu_read_lock();
3543 if (vif->type == NL80211_IFTYPE_AP) {
3544 struct ieee80211_if_ap *ap = &sdata->u.ap;
3545
3546 beacon = rcu_dereference(ap->beacon);
3547 if (WARN_ON(!beacon || !beacon->tail))
3548 goto out;
3549 beacon_data = beacon->tail;
3550 beacon_data_len = beacon->tail_len;
cd7760e6
SW		 3551 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3552 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3553
3554 beacon = rcu_dereference(ifibss->presp);
3555 if (!beacon)
3556 goto out;
3557
b8456a14
CYY		 3558 beacon_data = beacon->head;
3559 beacon_data_len = beacon->head_len;
3560 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3561 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3562
3563 beacon = rcu_dereference(ifmsh->beacon);
3564 if (!beacon)
3565 goto out;
3566
cd7760e6
SW		 3567 beacon_data = beacon->head;
3568 beacon_data_len = beacon->head_len;
73da7d5b
SW		 3569 } else {
3570 WARN_ON(1);
3571 goto out;
3572 }
3573
10d78f27
MK		 3574 if (!beacon->csa_counter_offsets[0])
3575 goto out;
3576
af296bdb 3577 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
73da7d5b
SW		 3578 goto out;
3579
af296bdb 3580 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
73da7d5b
SW		 3581 ret = true;
3582 out:
3583 rcu_read_unlock();
3584
3585 return ret;
3586}
3587EXPORT_SYMBOL(ieee80211_csa_is_complete);
3588
6ec8c332
AO		 3589static struct sk_buff *
3590__ieee80211_beacon_get(struct ieee80211_hw *hw,
3591 struct ieee80211_vif *vif,
3592 struct ieee80211_mutable_offsets *offs,
3593 bool is_template)
e2ebc74d
JB		 3594{
3595 struct ieee80211_local *local = hw_to_local(hw);
af296bdb 3596 struct beacon_data *beacon = NULL;
9d139c81 3597 struct sk_buff *skb = NULL;
e039fa4a 3598 struct ieee80211_tx_info *info;
e2ebc74d 3599 struct ieee80211_sub_if_data *sdata = NULL;
55de908a 3600 enum ieee80211_band band;
e00cfce0 3601 struct ieee80211_tx_rate_control txrc;
55de908a 3602 struct ieee80211_chanctx_conf *chanctx_conf;
1af586c9 3603 int csa_off_base = 0;
8318d78a 3604
5dfdaf58 3605 rcu_read_lock();
e2ebc74d 3606
32bfd35d 3607 sdata = vif_to_sdata(vif);
55de908a 3608 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 3609
55de908a 3610 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 3611 goto out;
3612
6ec8c332
AO		 3613 if (offs)
3614 memset(offs, 0, sizeof(*offs));
eddcbb94 3615
05c914fe 3616 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605 3617 struct ieee80211_if_ap *ap = &sdata->u.ap;
d012a605 3618
af296bdb 3619 beacon = rcu_dereference(ap->beacon);
3ad97fbc 3620 if (beacon) {
10d78f27 3621 if (beacon->csa_counter_offsets[0]) {
1af586c9 3622 if (!is_template)
e996ec2a 3623 __ieee80211_csa_update_counter(beacon);
1af586c9
AO		 3624
3625 ieee80211_set_csa(sdata, beacon);
3626 }
73da7d5b 3627
902acc78
JB		 3628 /*
3629 * headroom, head length,
3630 * tail length and maximum TIM length
3631 */
3632 skb = dev_alloc_skb(local->tx_headroom +
3633 beacon->head_len +
70dabeb7
FF		 3634 beacon->tail_len + 256 +
3635 local->hw.extra_beacon_tailroom);
902acc78
JB		 3636 if (!skb)
3637 goto out;
33b64eb2 3638
902acc78
JB		 3639 skb_reserve(skb, local->tx_headroom);
3640 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3641 beacon->head_len);
33b64eb2 3642
6ec8c332
AO		 3643 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3644 is_template);
33b64eb2 3645
6ec8c332
AO		 3646 if (offs) {
3647 offs->tim_offset = beacon->head_len;
3648 offs->tim_length = skb->len - beacon->head_len;
1af586c9
AO		 3649
3650 /* for AP the csa offsets are from tail */
3651 csa_off_base = skb->len;
6ec8c332 3652 }
eddcbb94 3653
902acc78
JB		 3654 if (beacon->tail)
3655 memcpy(skb_put(skb, beacon->tail_len),
3656 beacon->tail, beacon->tail_len);
9d139c81
JB		 3657 } else
3658 goto out;
05c914fe 3659 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 3660 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 3661 struct ieee80211_hdr *hdr;
33b64eb2 3662
af296bdb
MK		 3663 beacon = rcu_dereference(ifibss->presp);
3664 if (!beacon)
9d139c81
JB		 3665 goto out;
3666
10d78f27 3667 if (beacon->csa_counter_offsets[0]) {
1af586c9 3668 if (!is_template)
e996ec2a 3669 __ieee80211_csa_update_counter(beacon);
cd7760e6 3670
af296bdb 3671 ieee80211_set_csa(sdata, beacon);
1af586c9 3672 }
cd7760e6 3673
af296bdb 3674 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
70dabeb7 3675 local->hw.extra_beacon_tailroom);
9d139c81
JB		 3676 if (!skb)
3677 goto out;
c3ffeab4 3678 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3679 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3680 beacon->head_len);
9d139c81
JB		 3681
3682 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 3683 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3684 IEEE80211_STYPE_BEACON);
902acc78 3685 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 3686 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
472dbc45 3687
af296bdb
MK		 3688 beacon = rcu_dereference(ifmsh->beacon);
3689 if (!beacon)
ac1bd846 3690 goto out;
ac1bd846 3691
10d78f27 3692 if (beacon->csa_counter_offsets[0]) {
1af586c9
AO		 3693 if (!is_template)
3694 /* TODO: For mesh csa_counter is in TU, so
3695 * decrementing it by one isn't correct, but
3696 * for now we leave it consistent with overall
3697 * mac80211's behavior.
3698 */
e996ec2a 3699 __ieee80211_csa_update_counter(beacon);
1af586c9 3700
af296bdb 3701 ieee80211_set_csa(sdata, beacon);
1af586c9 3702 }
b8456a14 3703
dbf498fb 3704 if (ifmsh->sync_ops)
af296bdb 3705 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
dbf498fb 3706
3b69a9c5 3707 skb = dev_alloc_skb(local->tx_headroom +
af296bdb 3708 beacon->head_len +
3f52b7e3 3709 256 + /* TIM IE */
af296bdb 3710 beacon->tail_len +
70dabeb7 3711 local->hw.extra_beacon_tailroom);
902acc78
JB		 3712 if (!skb)
3713 goto out;
2b5e1967 3714 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3715 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3716 beacon->head_len);
6ec8c332
AO		 3717 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3718
3719 if (offs) {
af296bdb
MK		 3720 offs->tim_offset = beacon->head_len;
3721 offs->tim_length = skb->len - beacon->head_len;
6ec8c332
AO		 3722 }
3723
af296bdb
MK		 3724 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3725 beacon->tail_len);
9d139c81
JB		 3726 } else {
3727 WARN_ON(1);
5dfdaf58 3728 goto out;
e2ebc74d
JB		 3729 }
3730
1af586c9 3731 /* CSA offsets */
af296bdb 3732 if (offs && beacon) {
1af586c9
AO		 3733 int i;
3734
3735 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
af296bdb 3736 u16 csa_off = beacon->csa_counter_offsets[i];
1af586c9
AO		 3737
3738 if (!csa_off)
3739 continue;
3740
3741 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3742 }
3743 }
3744
4bf88530 3745 band = chanctx_conf->def.chan->band;
55de908a 3746
e039fa4a
JB		 3747 info = IEEE80211_SKB_CB(skb);
3748
3b8d81e0 3749 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 3750 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 3751 info->band = band;
e00cfce0
JM		 3752
3753 memset(&txrc, 0, sizeof(txrc));
3754 txrc.hw = hw;
e31583cd 3755 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 3756 txrc.bss_conf = &sdata->vif.bss_conf;
3757 txrc.skb = skb;
3758 txrc.reported_rate.idx = -1;
37eb0b16 3759 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 3760 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 3761 txrc.max_rate_idx = -1;
3762 else
3763 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 3764 txrc.bss = true;
e00cfce0 3765 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 3766
3767 info->control.vif = vif;
f591fa5d 3768
a472e71b
JL		 3769 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3770 IEEE80211_TX_CTL_ASSIGN_SEQ |
3771 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 3772 out:
5dfdaf58 3773 rcu_read_unlock();
e2ebc74d 3774 return skb;
6ec8c332
AO		 3775
3776}
3777
3778struct sk_buff *
3779ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3780 struct ieee80211_vif *vif,
3781 struct ieee80211_mutable_offsets *offs)
3782{
3783 return __ieee80211_beacon_get(hw, vif, offs, true);
3784}
3785EXPORT_SYMBOL(ieee80211_beacon_get_template);
3786
3787struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3788 struct ieee80211_vif *vif,
3789 u16 *tim_offset, u16 *tim_length)
3790{
3791 struct ieee80211_mutable_offsets offs = {};
3792 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
35afa588
HS		 3793 struct sk_buff *copy;
3794 struct ieee80211_supported_band *sband;
3795 int shift;
3796
3797 if (!bcn)
3798 return bcn;
6ec8c332
AO		 3799
3800 if (tim_offset)
3801 *tim_offset = offs.tim_offset;
3802
3803 if (tim_length)
3804 *tim_length = offs.tim_length;
3805
35afa588
HS		 3806 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
3807 !hw_to_local(hw)->monitors)
3808 return bcn;
3809
3810 /* send a copy to monitor interfaces */
3811 copy = skb_copy(bcn, GFP_ATOMIC);
3812 if (!copy)
3813 return bcn;
3814
3815 shift = ieee80211_vif_get_shift(vif);
3816 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
3817 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
3818
6ec8c332 3819 return bcn;
e2ebc74d 3820}
eddcbb94 3821EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 3822
02945821
AN		 3823struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3824 struct ieee80211_vif *vif)
3825{
3826 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 3827 struct sk_buff *skb = NULL;
3828 struct probe_resp *presp = NULL;
02945821
AN		 3829 struct ieee80211_hdr *hdr;
3830 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3831
3832 if (sdata->vif.type != NL80211_IFTYPE_AP)
3833 return NULL;
3834
3835 rcu_read_lock();
3836
3837 ap = &sdata->u.ap;
3838 presp = rcu_dereference(ap->probe_resp);
3839 if (!presp)
3840 goto out;
3841
aa7a0080 3842 skb = dev_alloc_skb(presp->len);
02945821
AN		 3843 if (!skb)
3844 goto out;
3845
aa7a0080
ES		 3846 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3847
02945821
AN		 3848 hdr = (struct ieee80211_hdr *) skb->data;
3849 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3850
3851out:
3852 rcu_read_unlock();
3853 return skb;
3854}
3855EXPORT_SYMBOL(ieee80211_proberesp_get);
3856
7044cc56
KV		 3857struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3858 struct ieee80211_vif *vif)
3859{
3860 struct ieee80211_sub_if_data *sdata;
3861 struct ieee80211_if_managed *ifmgd;
3862 struct ieee80211_pspoll *pspoll;
3863 struct ieee80211_local *local;
3864 struct sk_buff *skb;
3865
3866 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3867 return NULL;
3868
3869 sdata = vif_to_sdata(vif);
3870 ifmgd = &sdata->u.mgd;
3871 local = sdata->local;
3872
3873 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 3874 if (!skb)
7044cc56 3875 return NULL;
d15b8459 3876
7044cc56
KV		 3877 skb_reserve(skb, local->hw.extra_tx_headroom);
3878
3879 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3880 memset(pspoll, 0, sizeof(*pspoll));
3881 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3882 IEEE80211_STYPE_PSPOLL);
3883 pspoll->aid = cpu_to_le16(ifmgd->aid);
3884
3885 /* aid in PS-Poll has its two MSBs each set to 1 */
3886 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3887
3888 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3889 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3890
3891 return skb;
3892}
3893EXPORT_SYMBOL(ieee80211_pspoll_get);
3894
3895struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3896 struct ieee80211_vif *vif)
3897{
3898 struct ieee80211_hdr_3addr *nullfunc;
3899 struct ieee80211_sub_if_data *sdata;
3900 struct ieee80211_if_managed *ifmgd;
3901 struct ieee80211_local *local;
3902 struct sk_buff *skb;
3903
3904 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3905 return NULL;
3906
3907 sdata = vif_to_sdata(vif);
3908 ifmgd = &sdata->u.mgd;
3909 local = sdata->local;
3910
3911 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 3912 if (!skb)
7044cc56 3913 return NULL;
d15b8459 3914
7044cc56
KV		 3915 skb_reserve(skb, local->hw.extra_tx_headroom);
3916
3917 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3918 sizeof(*nullfunc));
3919 memset(nullfunc, 0, sizeof(*nullfunc));
3920 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3921 IEEE80211_STYPE_NULLFUNC |
3922 IEEE80211_FCTL_TODS);
3923 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3924 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3925 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3926
3927 return skb;
3928}
3929EXPORT_SYMBOL(ieee80211_nullfunc_get);
3930
05e54ea6 3931struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
a344d677 3932 const u8 *src_addr,
05e54ea6 3933 const u8 *ssid, size_t ssid_len,
b9a9ada1 3934 size_t tailroom)
05e54ea6 3935{
a344d677 3936 struct ieee80211_local *local = hw_to_local(hw);
05e54ea6
KV		 3937 struct ieee80211_hdr_3addr *hdr;
3938 struct sk_buff *skb;
3939 size_t ie_ssid_len;
3940 u8 *pos;
3941
05e54ea6
KV		 3942 ie_ssid_len = 2 + ssid_len;
3943
3944 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 3945 ie_ssid_len + tailroom);
d15b8459 3946 if (!skb)
05e54ea6 3947 return NULL;
05e54ea6
KV		 3948
3949 skb_reserve(skb, local->hw.extra_tx_headroom);
3950
3951 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3952 memset(hdr, 0, sizeof(*hdr));
3953 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3954 IEEE80211_STYPE_PROBE_REQ);
e83e6541 3955 eth_broadcast_addr(hdr->addr1);
a344d677 3956 memcpy(hdr->addr2, src_addr, ETH_ALEN);
e83e6541 3957 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 3958
3959 pos = skb_put(skb, ie_ssid_len);
3960 *pos++ = WLAN_EID_SSID;
3961 *pos++ = ssid_len;
88c868c4 3962 if (ssid_len)
05e54ea6
KV		 3963 memcpy(pos, ssid, ssid_len);
3964 pos += ssid_len;
3965
05e54ea6
KV		 3966 return skb;
3967}
3968EXPORT_SYMBOL(ieee80211_probereq_get);
3969
32bfd35d 3970void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3971 const void *frame, size_t frame_len,
e039fa4a 3972 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3973 struct ieee80211_rts *rts)
3974{
3975 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3976
065e9605
HH		 3977 rts->frame_control =
3978 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 3979 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3980 frame_txctl);
e2ebc74d
JB		 3981 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3982 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3983}
3984EXPORT_SYMBOL(ieee80211_rts_get);
3985
32bfd35d 3986void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3987 const void *frame, size_t frame_len,
e039fa4a 3988 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3989 struct ieee80211_cts *cts)
3990{
3991 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3992
065e9605
HH		 3993 cts->frame_control =
3994 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 3995 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3996 frame_len, frame_txctl);
e2ebc74d
JB		 3997 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3998}
3999EXPORT_SYMBOL(ieee80211_ctstoself_get);
4000
4001struct sk_buff *
32bfd35d 4002ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 4003 struct ieee80211_vif *vif)
e2ebc74d
JB		 4004{
4005 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 4006 struct sk_buff *skb = NULL;
5cf121c3 4007 struct ieee80211_tx_data tx;
e2ebc74d 4008 struct ieee80211_sub_if_data *sdata;
d012a605 4009 struct ps_data *ps;
e039fa4a 4010 struct ieee80211_tx_info *info;
55de908a 4011 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 4012
32bfd35d 4013 sdata = vif_to_sdata(vif);
5dfdaf58 4014
5dfdaf58 4015 rcu_read_lock();
55de908a 4016 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 4017
d012a605
MP		 4018 if (!chanctx_conf)
4019 goto out;
4020
4021 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4022 struct beacon_data *beacon =
4023 rcu_dereference(sdata->u.ap.beacon);
4024
4025 if (!beacon || !beacon->head)
4026 goto out;
4027
4028 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 4029 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4030 ps = &sdata->u.mesh.ps;
d012a605 4031 } else {
747cf5e9 4032 goto out;
d012a605 4033 }
5dfdaf58 4034
d012a605 4035 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 4036 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 4037
e2ebc74d 4038 while (1) {
d012a605 4039 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 4040 if (!skb)
747cf5e9 4041 goto out;
e2ebc74d
JB		 4042 local->total_ps_buffered--;
4043
d012a605 4044 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 4045 struct ieee80211_hdr *hdr =
4046 (struct ieee80211_hdr *) skb->data;
4047 /* more buffered multicast/broadcast frames ==> set
4048 * MoreData flag in IEEE 802.11 header to inform PS
4049 * STAs */
4050 hdr->frame_control |=
4051 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4052 }
4053
112c44b2 4054 if (sdata->vif.type == NL80211_IFTYPE_AP)
7cbf9d01 4055 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
7c10770f 4056 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
e2ebc74d
JB		 4057 break;
4058 dev_kfree_skb_any(skb);
4059 }
e039fa4a
JB		 4060
4061 info = IEEE80211_SKB_CB(skb);
4062
5cf121c3 4063 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 4064 info->band = chanctx_conf->def.chan->band;
e2ebc74d 4065
97b045d6 4066 if (invoke_tx_handlers(&tx))
e2ebc74d 4067 skb = NULL;
97b045d6 4068 out:
d0709a65 4069 rcu_read_unlock();
e2ebc74d
JB		 4070
4071 return skb;
4072}
4073EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 4074
b6da911b
LK		 4075int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4076{
4077 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4078 struct ieee80211_sub_if_data *sdata = sta->sdata;
4079 struct ieee80211_local *local = sdata->local;
4080 int ret;
4081 u32 queues;
4082
4083 lockdep_assert_held(&local->sta_mtx);
4084
4085 /* only some cases are supported right now */
4086 switch (sdata->vif.type) {
4087 case NL80211_IFTYPE_STATION:
4088 case NL80211_IFTYPE_AP:
4089 case NL80211_IFTYPE_AP_VLAN:
4090 break;
4091 default:
4092 WARN_ON(1);
4093 return -EINVAL;
4094 }
4095
4096 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4097 return -EINVAL;
4098
4099 if (sta->reserved_tid == tid) {
4100 ret = 0;
4101 goto out;
4102 }
4103
4104 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4105 sdata_err(sdata, "TID reservation already active\n");
4106 ret = -EALREADY;
4107 goto out;
4108 }
4109
4110 ieee80211_stop_vif_queues(sdata->local, sdata,
4111 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4112
4113 synchronize_net();
4114
4115 /* Tear down BA sessions so we stop aggregating on this TID */
30686bf7 4116 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
b6da911b
LK		 4117 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4118 __ieee80211_stop_tx_ba_session(sta, tid,
4119 AGG_STOP_LOCAL_REQUEST);
4120 }
4121
4122 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3b24f4c6 4123 __ieee80211_flush_queues(local, sdata, queues, false);
b6da911b
LK		 4124
4125 sta->reserved_tid = tid;
4126
4127 ieee80211_wake_vif_queues(local, sdata,
4128 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4129
30686bf7 4130 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
b6da911b
LK		 4131 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4132
4133 ret = 0;
4134 out:
4135 return ret;
4136}
4137EXPORT_SYMBOL(ieee80211_reserve_tid);
4138
4139void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4140{
4141 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4142 struct ieee80211_sub_if_data *sdata = sta->sdata;
4143
4144 lockdep_assert_held(&sdata->local->sta_mtx);
4145
4146 /* only some cases are supported right now */
4147 switch (sdata->vif.type) {
4148 case NL80211_IFTYPE_STATION:
4149 case NL80211_IFTYPE_AP:
4150 case NL80211_IFTYPE_AP_VLAN:
4151 break;
4152 default:
4153 WARN_ON(1);
4154 return;
4155 }
4156
4157 if (tid != sta->reserved_tid) {
4158 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4159 return;
4160 }
4161
4162 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4163}
4164EXPORT_SYMBOL(ieee80211_unreserve_tid);
4165
55de908a
JB		 4166void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4167 struct sk_buff *skb, int tid,
4168 enum ieee80211_band band)
3b8d81e0 4169{
353d09c6 4170 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 4171
d57a544d
ZS		 4172 skb_reset_mac_header(skb);
4173 skb_reset_network_header(skb);
4174 skb_reset_transport_header(skb);
3b8d81e0 4175
3a25a8c8 4176 skb_set_queue_mapping(skb, ac);
cf6bb79a 4177 skb->priority = tid;
cf0277e7 4178
89afe614
JB		 4179 skb->dev = sdata->dev;
4180
3d34deb6
JB		 4181 /*
4182 * The other path calling ieee80211_xmit is from the tasklet,
4183 * and while we can handle concurrent transmissions locking
4184 * requirements are that we do not come into tx with bhs on.
4185 */
4186 local_bh_disable();
73c4e195 4187 IEEE80211_SKB_CB(skb)->band = band;
7c10770f 4188 ieee80211_xmit(sdata, NULL, skb);
3d34deb6 4189 local_bh_enable();
3b8d81e0 4190}
Linux kernel - Deliverables
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