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Merge tag 'dmaengine-fix-4.5-rc1' of git://git.infradead.org/users/vkoul/slave-dma
[linux-2.6-block.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
c2c98fde
JB		 713 if (tx->sta)
714 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 715
716 /*
717 * Lets not bother rate control if we're associated and cannot
718 * talk to the sta. This should not happen.
719 */
c2c98fde 720 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 721 !rate_usable_index_exists(sband, &tx->sta->sta),
722 "%s: Dropped data frame as no usable bitrate found while "
723 "scanning and associated. Target station: "
724 "%pM on %d GHz band\n",
47846c9b 725 tx->sdata->name, hdr->addr1,
2d56577b 726 info->band ? 5 : 2))
b770b43e 727 return TX_DROP;
2e92e6f2 728
b770b43e
LR		 729 /*
730 * If we're associated with the sta at this point we know we can at
731 * least send the frame at the lowest bit rate.
732 */
e6a9854b
JB		 733 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
734
0d528d85
FF		 735 if (tx->sta && !info->control.skip_table)
736 ratetbl = rcu_dereference(tx->sta->sta.rates);
737
738 if (unlikely(info->control.rates[0].idx < 0)) {
739 if (ratetbl) {
740 struct ieee80211_tx_rate rate = {
741 .idx = ratetbl->rate[0].idx,
742 .flags = ratetbl->rate[0].flags,
743 .count = ratetbl->rate[0].count
744 };
745
746 if (ratetbl->rate[0].idx < 0)
747 return TX_DROP;
748
749 tx->rate = rate;
750 } else {
751 return TX_DROP;
752 }
753 } else {
754 tx->rate = info->control.rates[0];
755 }
e6a9854b 756
c1ce5a74 757 if (txrc.reported_rate.idx < 0) {
0d528d85 758 txrc.reported_rate = tx->rate;
c1ce5a74 759 if (tx->sta && ieee80211_is_data(hdr->frame_control))
e5a9f8d0 760 tx->sta->tx_stats.last_rate = txrc.reported_rate;
c1ce5a74 761 } else if (tx->sta)
e5a9f8d0 762 tx->sta->tx_stats.last_rate = txrc.reported_rate;
e039fa4a 763
0d528d85
FF		 764 if (ratetbl)
765 return TX_CONTINUE;
766
e6a9854b
JB		 767 if (unlikely(!info->control.rates[0].count))
768 info->control.rates[0].count = 1;
e2ebc74d 769
9955151d
GS		 770 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
771 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
772 info->control.rates[0].count = 1;
773
e6a9854b
JB		 774 return TX_CONTINUE;
775}
776
ba8c3d6f
FF		 777static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
778{
779 u16 *seq = &sta->tid_seq[tid];
780 __le16 ret = cpu_to_le16(*seq);
781
782 /* Increase the sequence number. */
783 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
784
785 return ret;
786}
787
f591fa5d
JB		 788static ieee80211_tx_result debug_noinline
789ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
790{
791 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
792 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
f591fa5d
JB		 793 u8 *qc;
794 int tid;
795
25d834e1
JB		 796 /*
797 * Packet injection may want to control the sequence
798 * number, if we have no matching interface then we
799 * neither assign one ourselves nor ask the driver to.
800 */
5061b0c2 801 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 802 return TX_CONTINUE;
803
f591fa5d
JB		 804 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
805 return TX_CONTINUE;
806
807 if (ieee80211_hdrlen(hdr->frame_control) < 24)
808 return TX_CONTINUE;
809
49a59543
JB		 810 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
811 return TX_CONTINUE;
812
94778280
JB		 813 /*
814 * Anything but QoS data that has a sequence number field
815 * (is long enough) gets a sequence number from the global
c4c205f3
BC		 816 * counter. QoS data frames with a multicast destination
817 * also use the global counter (802.11-2012 9.3.2.10).
94778280 818 */
c4c205f3
BC		 819 if (!ieee80211_is_data_qos(hdr->frame_control) ||
820 is_multicast_ether_addr(hdr->addr1)) {
94778280 821 /* driver should assign sequence number */
f591fa5d 822 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 823 /* for pure STA mode without beacons, we can do it */
824 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
825 tx->sdata->sequence_number += 0x10;
79c892b8 826 if (tx->sta)
e5a9f8d0 827 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
f591fa5d
JB		 828 return TX_CONTINUE;
829 }
830
831 /*
832 * This should be true for injected/management frames only, for
833 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
834 * above since they are not QoS-data frames.
835 */
836 if (!tx->sta)
837 return TX_CONTINUE;
838
839 /* include per-STA, per-TID sequence counter */
840
841 qc = ieee80211_get_qos_ctl(hdr);
842 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
e5a9f8d0 843 tx->sta->tx_stats.msdu[tid]++;
f591fa5d 844
ba8c3d6f
FF		 845 if (!tx->sta->sta.txq[0])
846 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
f591fa5d
JB		 847
848 return TX_CONTINUE;
849}
850
252b86c4 851static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 852 struct sk_buff *skb, int hdrlen,
853 int frag_threshold)
854{
252b86c4 855 struct ieee80211_local *local = tx->local;
a1a3fcec 856 struct ieee80211_tx_info *info;
252b86c4 857 struct sk_buff *tmp;
2de8e0d9
JB		 858 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
859 int pos = hdrlen + per_fragm;
860 int rem = skb->len - hdrlen - per_fragm;
861
862 if (WARN_ON(rem < 0))
863 return -EINVAL;
864
252b86c4
JB		 865 /* first fragment was already added to queue by caller */
866
2de8e0d9
JB		 867 while (rem) {
868 int fraglen = per_fragm;
869
870 if (fraglen > rem)
871 fraglen = rem;
872 rem -= fraglen;
873 tmp = dev_alloc_skb(local->tx_headroom +
874 frag_threshold +
2475b1cc 875 tx->sdata->encrypt_headroom +
2de8e0d9
JB		 876 IEEE80211_ENCRYPT_TAILROOM);
877 if (!tmp)
878 return -ENOMEM;
252b86c4
JB		 879
880 __skb_queue_tail(&tx->skbs, tmp);
881
2475b1cc
MS		 882 skb_reserve(tmp,
883 local->tx_headroom + tx->sdata->encrypt_headroom);
884
2de8e0d9
JB		 885 /* copy control information */
886 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 887
888 info = IEEE80211_SKB_CB(tmp);
889 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
890 IEEE80211_TX_CTL_FIRST_FRAGMENT);
891
892 if (rem)
893 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
894
2de8e0d9
JB		 895 skb_copy_queue_mapping(tmp, skb);
896 tmp->priority = skb->priority;
2de8e0d9 897 tmp->dev = skb->dev;
2de8e0d9
JB		 898
899 /* copy header and data */
900 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
901 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
902
903 pos += fraglen;
904 }
905
252b86c4 906 /* adjust first fragment's length */
338f977f 907 skb_trim(skb, hdrlen + per_fragm);
2de8e0d9
JB		 908 return 0;
909}
910
d9e8a70f 911static ieee80211_tx_result debug_noinline
e2454948
JB		 912ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
913{
2de8e0d9
JB		 914 struct sk_buff *skb = tx->skb;
915 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
916 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 917 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 918 int hdrlen;
919 int fragnum;
e2454948 920
252b86c4
JB		 921 /* no matter what happens, tx->skb moves to tx->skbs */
922 __skb_queue_tail(&tx->skbs, skb);
923 tx->skb = NULL;
924
a26eb27a
JB		 925 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
926 return TX_CONTINUE;
927
928 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 929 return TX_CONTINUE;
930
eefce91a
JB		 931 /*
932 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 933 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 934 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 935 */
8b30b1fe 936 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 937 return TX_DROP;
938
065e9605 939 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 940
a26eb27a 941 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 942 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 943 return TX_DROP;
e6a9854b 944
2de8e0d9
JB		 945 /*
946 * Now fragment the frame. This will allocate all the fragments and
947 * chain them (using skb as the first fragment) to skb->next.
948 * During transmission, we will remove the successfully transmitted
949 * fragments from this list. When the low-level driver rejects one
950 * of the fragments then we will simply pretend to accept the skb
951 * but store it away as pending.
952 */
252b86c4 953 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 954 return TX_DROP;
e6a9854b 955
2de8e0d9
JB		 956 /* update duration/seq/flags of fragments */
957 fragnum = 0;
252b86c4
JB		 958
959 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 960 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 961
2de8e0d9
JB		 962 hdr = (void *)skb->data;
963 info = IEEE80211_SKB_CB(skb);
e6a9854b 964
252b86c4 965 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 966 hdr->frame_control |= morefrags;
e6a9854b
JB		 967 /*
968 * No multi-rate retries for fragmented frames, that
969 * would completely throw off the NAV at other STAs.
970 */
971 info->control.rates[1].idx = -1;
972 info->control.rates[2].idx = -1;
973 info->control.rates[3].idx = -1;
e3e1a0bc 974 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 975 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 976 } else {
977 hdr->frame_control &= ~morefrags;
e6a9854b 978 }
2de8e0d9
JB		 979 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
980 fragnum++;
252b86c4 981 }
e2ebc74d 982
9ae54c84 983 return TX_CONTINUE;
e2ebc74d
JB		 984}
985
feff1f2f
JB		 986static ieee80211_tx_result debug_noinline
987ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
988{
252b86c4 989 struct sk_buff *skb;
560d2682 990 int ac = -1;
feff1f2f
JB		 991
992 if (!tx->sta)
993 return TX_CONTINUE;
994
252b86c4 995 skb_queue_walk(&tx->skbs, skb) {
560d2682 996 ac = skb_get_queue_mapping(skb);
e5a9f8d0 997 tx->sta->tx_stats.bytes[ac] += skb->len;
252b86c4 998 }
560d2682 999 if (ac >= 0)
e5a9f8d0 1000 tx->sta->tx_stats.packets[ac]++;
feff1f2f
JB		 1001
1002 return TX_CONTINUE;
1003}
1004
d9e8a70f 1005static ieee80211_tx_result debug_noinline
e2454948
JB		 1006ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1007{
1008 if (!tx->key)
1009 return TX_CONTINUE;
1010
97359d12
JB		 1011 switch (tx->key->conf.cipher) {
1012 case WLAN_CIPHER_SUITE_WEP40:
1013 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1014 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1015 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1016 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1017 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1018 return ieee80211_crypto_ccmp_encrypt(
1019 tx, IEEE80211_CCMP_MIC_LEN);
1020 case WLAN_CIPHER_SUITE_CCMP_256:
1021 return ieee80211_crypto_ccmp_encrypt(
1022 tx, IEEE80211_CCMP_256_MIC_LEN);
97359d12 1023 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1024 return ieee80211_crypto_aes_cmac_encrypt(tx);
56c52da2
JM		 1025 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1026 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
8ade538b
JM		 1027 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1028 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1029 return ieee80211_crypto_aes_gmac_encrypt(tx);
00b9cfa3
JM		 1030 case WLAN_CIPHER_SUITE_GCMP:
1031 case WLAN_CIPHER_SUITE_GCMP_256:
1032 return ieee80211_crypto_gcmp_encrypt(tx);
3ffc2a90 1033 default:
d32a1028 1034 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1035 }
1036
e2454948
JB		 1037 return TX_DROP;
1038}
1039
d9e8a70f 1040static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1041ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1042{
252b86c4 1043 struct sk_buff *skb;
2de8e0d9
JB		 1044 struct ieee80211_hdr *hdr;
1045 int next_len;
1046 bool group_addr;
03f93c3d 1047
252b86c4 1048 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1049 hdr = (void *) skb->data;
7e0aae47
JM		 1050 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1051 break; /* must not overwrite AID */
252b86c4
JB		 1052 if (!skb_queue_is_last(&tx->skbs, skb)) {
1053 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1054 next_len = next->len;
1055 } else
1056 next_len = 0;
2de8e0d9 1057 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1058
2de8e0d9 1059 hdr->duration_id =
252b86c4
JB		 1060 ieee80211_duration(tx, skb, group_addr, next_len);
1061 }
03f93c3d
JB		 1062
1063 return TX_CONTINUE;
1064}
1065
e2ebc74d
JB		 1066/* actual transmit path */
1067
a622ab72
JB		 1068static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1069 struct sk_buff *skb,
1070 struct ieee80211_tx_info *info,
1071 struct tid_ampdu_tx *tid_tx,
1072 int tid)
1073{
1074 bool queued = false;
285fa695 1075 bool reset_agg_timer = false;
aa454580 1076 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1077
1078 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1079 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1080 reset_agg_timer = true;
0ab33703
JB		 1081 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1082 /*
1083 * nothing -- this aggregation session is being started
1084 * but that might still fail with the driver
1085 */
ba8c3d6f 1086 } else if (!tx->sta->sta.txq[tid]) {
a622ab72
JB		 1087 spin_lock(&tx->sta->lock);
1088 /*
1089 * Need to re-check now, because we may get here
1090 *
1091 * 1) in the window during which the setup is actually
1092 * already done, but not marked yet because not all
1093 * packets are spliced over to the driver pending
1094 * queue yet -- if this happened we acquire the lock
1095 * either before or after the splice happens, but
1096 * need to recheck which of these cases happened.
1097 *
1098 * 2) during session teardown, if the OPERATIONAL bit
1099 * was cleared due to the teardown but the pointer
1100 * hasn't been assigned NULL yet (or we loaded it
1101 * before it was assigned) -- in this case it may
1102 * now be NULL which means we should just let the
1103 * packet pass through because splicing the frames
1104 * back is already done.
1105 */
40b275b6 1106 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1107
1108 if (!tid_tx) {
1109 /* do nothing, let packet pass through */
1110 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1111 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1112 reset_agg_timer = true;
a622ab72
JB		 1113 } else {
1114 queued = true;
1115 info->control.vif = &tx->sdata->vif;
1116 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
e9de0190
MK		 1117 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
1118 IEEE80211_TX_CTL_NO_PS_BUFFER |
1119 IEEE80211_TX_STATUS_EOSP;
a622ab72 1120 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1121 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1122 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1123 }
1124 spin_unlock(&tx->sta->lock);
aa454580
HS		 1125
1126 if (purge_skb)
c3e7724b 1127 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1128 }
1129
285fa695
NM		 1130 /* reset session timer */
1131 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1132 tid_tx->last_tx = jiffies;
285fa695 1133
a622ab72
JB		 1134 return queued;
1135}
1136
58d4185e
JB		 1137/*
1138 * initialises @tx
7c10770f
JB		 1139 * pass %NULL for the station if unknown, a valid pointer if known
1140 * or an ERR_PTR() if the station is known not to exist
58d4185e 1141 */
9ae54c84 1142static ieee80211_tx_result
3b8d81e0
JB		 1143ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1144 struct ieee80211_tx_data *tx,
7c10770f 1145 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1146{
3b8d81e0 1147 struct ieee80211_local *local = sdata->local;
58d4185e 1148 struct ieee80211_hdr *hdr;
e039fa4a 1149 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1150 int tid;
a622ab72 1151 u8 *qc;
e2ebc74d
JB		 1152
1153 memset(tx, 0, sizeof(*tx));
1154 tx->skb = skb;
e2ebc74d 1155 tx->local = local;
3b8d81e0 1156 tx->sdata = sdata;
252b86c4 1157 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1158
cd8ffc80
JB		 1159 /*
1160 * If this flag is set to true anywhere, and we get here,
1161 * we are doing the needed processing, so remove the flag
1162 * now.
1163 */
1164 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1165
58d4185e
JB		 1166 hdr = (struct ieee80211_hdr *) skb->data;
1167
7c10770f
JB		 1168 if (likely(sta)) {
1169 if (!IS_ERR(sta))
1170 tx->sta = sta;
1171 } else {
1172 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1173 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1174 if (!tx->sta && sdata->wdev.use_4addr)
1175 return TX_DROP;
1176 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1177 IEEE80211_TX_CTL_INJECTED) ||
1178 tx->sdata->control_port_protocol == tx->skb->protocol) {
1179 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1180 }
1181 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1182 tx->sta = sta_info_get(sdata, hdr->addr1);
3f0e0b22 1183 }
58d4185e 1184
cd8ffc80 1185 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1186 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
30686bf7
JB		 1187 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1188 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1189 struct tid_ampdu_tx *tid_tx;
1190
8b30b1fe
S		 1191 qc = ieee80211_get_qos_ctl(hdr);
1192 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1193
a622ab72
JB		 1194 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1195 if (tid_tx) {
1196 bool queued;
cd8ffc80 1197
a622ab72
JB		 1198 queued = ieee80211_tx_prep_agg(tx, skb, info,
1199 tid_tx, tid);
1200
1201 if (unlikely(queued))
1202 return TX_QUEUED;
1203 }
8b30b1fe
S		 1204 }
1205
badffb72 1206 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1207 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1208 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1209 } else
5cf121c3 1210 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1211
a26eb27a
JB		 1212 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1213 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1214 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1215 info->flags & IEEE80211_TX_CTL_AMPDU)
1216 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1217 }
1218
e2ebc74d 1219 if (!tx->sta)
e039fa4a 1220 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1 1221 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
e039fa4a 1222 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1
FF		 1223 ieee80211_check_fast_xmit(tx->sta);
1224 }
58d4185e 1225
e039fa4a 1226 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1227
9ae54c84 1228 return TX_CONTINUE;
e2ebc74d
JB		 1229}
1230
ba8c3d6f
FF		 1231static void ieee80211_drv_tx(struct ieee80211_local *local,
1232 struct ieee80211_vif *vif,
1233 struct ieee80211_sta *pubsta,
1234 struct sk_buff *skb)
1235{
1236 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1237 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1238 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1239 struct ieee80211_tx_control control = {
1240 .sta = pubsta,
1241 };
1242 struct ieee80211_txq *txq = NULL;
1243 struct txq_info *txqi;
1244 u8 ac;
1245
1246 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1247 goto tx_normal;
1248
1249 if (!ieee80211_is_data(hdr->frame_control))
1250 goto tx_normal;
1251
1252 if (pubsta) {
1253 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1254
1255 txq = pubsta->txq[tid];
1256 } else if (vif) {
1257 txq = vif->txq;
1258 }
1259
1260 if (!txq)
1261 goto tx_normal;
1262
1263 ac = txq->ac;
1264 txqi = to_txq_info(txq);
1265 atomic_inc(&sdata->txqs_len[ac]);
1266 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1267 netif_stop_subqueue(sdata->dev, ac);
1268
1269 skb_queue_tail(&txqi->queue, skb);
1270 drv_wake_tx_queue(local, txqi);
1271
1272 return;
1273
1274tx_normal:
1275 drv_tx(local, &control, skb);
1276}
1277
1278struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1279 struct ieee80211_txq *txq)
1280{
1281 struct ieee80211_local *local = hw_to_local(hw);
1282 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1283 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1284 struct ieee80211_hdr *hdr;
1285 struct sk_buff *skb = NULL;
1286 u8 ac = txq->ac;
1287
1288 spin_lock_bh(&txqi->queue.lock);
1289
1290 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1291 goto out;
1292
1293 skb = __skb_dequeue(&txqi->queue);
1294 if (!skb)
1295 goto out;
1296
1297 atomic_dec(&sdata->txqs_len[ac]);
1298 if (__netif_subqueue_stopped(sdata->dev, ac))
1299 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1300
1301 hdr = (struct ieee80211_hdr *)skb->data;
1302 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1303 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1304 sta);
1305 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1306
1307 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1308 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1309 info->flags |= IEEE80211_TX_CTL_AMPDU;
1310 else
1311 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1312 }
1313
1314out:
1315 spin_unlock_bh(&txqi->queue.lock);
1316
1317 return skb;
1318}
1319EXPORT_SYMBOL(ieee80211_tx_dequeue);
1320
11127e91
JB		 1321static bool ieee80211_tx_frags(struct ieee80211_local *local,
1322 struct ieee80211_vif *vif,
1323 struct ieee80211_sta *sta,
1324 struct sk_buff_head *skbs,
1325 bool txpending)
e2ebc74d 1326{
252b86c4 1327 struct sk_buff *skb, *tmp;
3b8d81e0 1328 unsigned long flags;
e2ebc74d 1329
252b86c4 1330 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1331 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1332 int q = info->hw_queue;
1333
1334#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1335 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1336 __skb_unlink(skb, skbs);
c3e7724b 1337 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1338 continue;
1339 }
1340#endif
3b8d81e0
JB		 1341
1342 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1343 if (local->queue_stop_reasons[q] ||
7bb45683 1344 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1345 if (unlikely(info->flags &
a7679ed5
SF		 1346 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1347 if (local->queue_stop_reasons[q] &
1348 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1349 /*
1350 * Drop off-channel frames if queues
1351 * are stopped for any reason other
1352 * than off-channel operation. Never
1353 * queue them.
1354 */
1355 spin_unlock_irqrestore(
1356 &local->queue_stop_reason_lock,
1357 flags);
1358 ieee80211_purge_tx_queue(&local->hw,
1359 skbs);
1360 return true;
1361 }
1362 } else {
1363
6c17b77b 1364 /*
a7679ed5
SF		 1365 * Since queue is stopped, queue up frames for
1366 * later transmission from the tx-pending
1367 * tasklet when the queue is woken again.
6c17b77b 1368 */
a7679ed5
SF		 1369 if (txpending)
1370 skb_queue_splice_init(skbs,
1371 &local->pending[q]);
1372 else
1373 skb_queue_splice_tail_init(skbs,
1374 &local->pending[q]);
1375
1376 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1377 flags);
1378 return false;
6c17b77b 1379 }
7bb45683 1380 }
3b8d81e0 1381 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1382
11127e91 1383 info->control.vif = vif;
f0e72851 1384
11127e91 1385 __skb_unlink(skb, skbs);
ba8c3d6f 1386 ieee80211_drv_tx(local, vif, sta, skb);
11127e91 1387 }
5061b0c2 1388
11127e91
JB		 1389 return true;
1390}
1391
1392/*
1393 * Returns false if the frame couldn't be transmitted but was queued instead.
1394 */
1395static bool __ieee80211_tx(struct ieee80211_local *local,
1396 struct sk_buff_head *skbs, int led_len,
1397 struct sta_info *sta, bool txpending)
1398{
1399 struct ieee80211_tx_info *info;
1400 struct ieee80211_sub_if_data *sdata;
1401 struct ieee80211_vif *vif;
1402 struct ieee80211_sta *pubsta;
1403 struct sk_buff *skb;
1404 bool result = true;
1405 __le16 fc;
5061b0c2 1406
11127e91
JB		 1407 if (WARN_ON(skb_queue_empty(skbs)))
1408 return true;
ec25acc4 1409
11127e91
JB		 1410 skb = skb_peek(skbs);
1411 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1412 info = IEEE80211_SKB_CB(skb);
1413 sdata = vif_to_sdata(info->control.vif);
1414 if (sta && !sta->uploaded)
1415 sta = NULL;
1416
1417 if (sta)
1418 pubsta = &sta->sta;
1419 else
1420 pubsta = NULL;
1421
1422 switch (sdata->vif.type) {
1423 case NL80211_IFTYPE_MONITOR:
c82b5a74
JB		 1424 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1425 vif = &sdata->vif;
1426 break;
1427 }
4b6f1dd6 1428 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1429 if (sdata) {
4b6f1dd6 1430 vif = &sdata->vif;
3a25a8c8
JB		 1431 info->hw_queue =
1432 vif->hw_queue[skb_get_queue_mapping(skb)];
30686bf7 1433 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
63b4d8b3 1434 ieee80211_purge_tx_queue(&local->hw, skbs);
3a25a8c8
JB		 1435 return true;
1436 } else
4b6f1dd6 1437 vif = NULL;
11127e91
JB		 1438 break;
1439 case NL80211_IFTYPE_AP_VLAN:
1440 sdata = container_of(sdata->bss,
1441 struct ieee80211_sub_if_data, u.ap);
1442 /* fall through */
1443 default:
1444 vif = &sdata->vif;
1445 break;
e2ebc74d 1446 }
2de8e0d9 1447
cb831b53
JB		 1448 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1449 txpending);
11127e91 1450
74e4dbfd 1451 ieee80211_tpt_led_trig_tx(local, fc, led_len);
74e4dbfd 1452
4db4e0a1 1453 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1454
11127e91 1455 return result;
e2ebc74d
JB		 1456}
1457
97b045d6
JB		 1458/*
1459 * Invoke TX handlers, return 0 on success and non-zero if the
1460 * frame was dropped or queued.
1461 */
1462static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1463{
252b86c4 1464 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1465 ieee80211_tx_result res = TX_DROP;
97b045d6 1466
9aa4aee3
JB		 1467#define CALL_TXH(txh) \
1468 do { \
1469 res = txh(tx); \
1470 if (res != TX_CONTINUE) \
1471 goto txh_done; \
1472 } while (0)
1473
5c1b98a5 1474 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1475 CALL_TXH(ieee80211_tx_h_check_assoc);
1476 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1477 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1478 CALL_TXH(ieee80211_tx_h_select_key);
30686bf7 1479 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
af65cd96 1480 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1481
aa5b5492
JB		 1482 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1483 __skb_queue_tail(&tx->skbs, tx->skb);
1484 tx->skb = NULL;
c6fcf6bc 1485 goto txh_done;
aa5b5492 1486 }
c6fcf6bc
JB		 1487
1488 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1489 CALL_TXH(ieee80211_tx_h_sequence);
1490 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1491 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1492 CALL_TXH(ieee80211_tx_h_stats);
1493 CALL_TXH(ieee80211_tx_h_encrypt);
30686bf7 1494 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
8fd369ee 1495 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1496#undef CALL_TXH
97b045d6 1497
d9e8a70f 1498 txh_done:
97b045d6 1499 if (unlikely(res == TX_DROP)) {
5479d0e7 1500 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1501 if (tx->skb)
c3e7724b 1502 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1503 else
1f98ab7f 1504 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1505 return -1;
1506 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1507 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1508 return -1;
1509 }
1510
1511 return 0;
1512}
1513
06be6b14
FF		 1514bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1515 struct ieee80211_vif *vif, struct sk_buff *skb,
1516 int band, struct ieee80211_sta **sta)
1517{
1518 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1520 struct ieee80211_tx_data tx;
88724a81 1521 struct sk_buff *skb2;
06be6b14 1522
7c10770f 1523 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
06be6b14
FF		 1524 return false;
1525
1526 info->band = band;
1527 info->control.vif = vif;
1528 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1529
1530 if (invoke_tx_handlers(&tx))
1531 return false;
1532
1533 if (sta) {
1534 if (tx.sta)
1535 *sta = &tx.sta->sta;
1536 else
1537 *sta = NULL;
1538 }
1539
88724a81
JB		 1540 /* this function isn't suitable for fragmented data frames */
1541 skb2 = __skb_dequeue(&tx.skbs);
1542 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1543 ieee80211_free_txskb(hw, skb2);
1544 ieee80211_purge_tx_queue(hw, &tx.skbs);
1545 return false;
1546 }
1547
06be6b14
FF		 1548 return true;
1549}
1550EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1551
7bb45683
JB		 1552/*
1553 * Returns false if the frame couldn't be transmitted but was queued instead.
1554 */
1555static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
7c10770f
JB		 1556 struct sta_info *sta, struct sk_buff *skb,
1557 bool txpending)
e2ebc74d 1558{
3b8d81e0 1559 struct ieee80211_local *local = sdata->local;
5cf121c3 1560 struct ieee80211_tx_data tx;
97b045d6 1561 ieee80211_tx_result res_prepare;
e039fa4a 1562 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1563 bool result = true;
74e4dbfd 1564 int led_len;
e2ebc74d 1565
e2ebc74d
JB		 1566 if (unlikely(skb->len < 10)) {
1567 dev_kfree_skb(skb);
7bb45683 1568 return true;
e2ebc74d
JB		 1569 }
1570
58d4185e 1571 /* initialises tx */
74e4dbfd 1572 led_len = skb->len;
7c10770f 1573 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
e2ebc74d 1574
cd8ffc80 1575 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1576 ieee80211_free_txskb(&local->hw, skb);
55de908a 1577 return true;
cd8ffc80 1578 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1579 return true;
e2ebc74d
JB		 1580 }
1581
3a25a8c8
JB		 1582 /* set up hw_queue value early */
1583 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
30686bf7 1584 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3a25a8c8
JB		 1585 info->hw_queue =
1586 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1587
7bb45683 1588 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1589 result = __ieee80211_tx(local, &tx.skbs, led_len,
1590 tx.sta, txpending);
55de908a 1591
7bb45683 1592 return result;
e2ebc74d
JB		 1593}
1594
1595/* device xmit handlers */
1596
3bff1865 1597static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1598 struct sk_buff *skb,
1599 int head_need, bool may_encrypt)
1600{
3bff1865 1601 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1602 int tail_need = 0;
1603
3bff1865 1604 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1605 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1606 tail_need -= skb_tailroom(skb);
1607 tail_need = max_t(int, tail_need, 0);
1608 }
1609
c70f59a2 1610 if (skb_cloned(skb) &&
30686bf7 1611 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
c70f59a2 1612 !skb_clone_writable(skb, ETH_HLEN) ||
17c18bf8 1613 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
23c0752a 1614 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1615 else if (head_need || tail_need)
23c0752a 1616 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1617 else
1618 return 0;
23c0752a
JB		 1619
1620 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1621 wiphy_debug(local->hw.wiphy,
1622 "failed to reallocate TX buffer\n");
23c0752a
JB		 1623 return -ENOMEM;
1624 }
1625
23c0752a
JB		 1626 return 0;
1627}
1628
7c10770f
JB		 1629void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1630 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1631{
3b8d81e0 1632 struct ieee80211_local *local = sdata->local;
e039fa4a 1633 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1634 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1635 int headroom;
23c0752a 1636 bool may_encrypt;
e2ebc74d 1637
3b8d81e0 1638 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1639
3b8d81e0 1640 headroom = local->tx_headroom;
23c0752a 1641 if (may_encrypt)
2475b1cc 1642 headroom += sdata->encrypt_headroom;
23c0752a
JB		 1643 headroom -= skb_headroom(skb);
1644 headroom = max_t(int, 0, headroom);
1645
3bff1865 1646 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1647 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1648 return;
e2ebc74d
JB		 1649 }
1650
740c1aa3 1651 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1652 info->control.vif = &sdata->vif;
e2ebc74d 1653
3f52b7e3
MP		 1654 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1655 if (ieee80211_is_data(hdr->frame_control) &&
1656 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1657 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1658 return; /* skb queued: don't free */
1659 } else {
1660 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1661 }
98aed9fd 1662 }
cca89496 1663
2154c81c 1664 ieee80211_set_qos_hdr(sdata, skb);
7c10770f 1665 ieee80211_tx(sdata, sta, skb, false);
e2ebc74d
JB		 1666}
1667
73b9f03a
JB		 1668static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1669{
1670 struct ieee80211_radiotap_iterator iterator;
1671 struct ieee80211_radiotap_header *rthdr =
1672 (struct ieee80211_radiotap_header *) skb->data;
1673 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1674 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1675 NULL);
1676 u16 txflags;
1677
1678 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1679 IEEE80211_TX_CTL_DONTFRAG;
1680
1681 /*
1682 * for every radiotap entry that is present
1683 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1684 * entries present, or -EINVAL on error)
1685 */
1686
1687 while (!ret) {
1688 ret = ieee80211_radiotap_iterator_next(&iterator);
1689
1690 if (ret)
1691 continue;
1692
1693 /* see if this argument is something we can use */
1694 switch (iterator.this_arg_index) {
1695 /*
1696 * You must take care when dereferencing iterator.this_arg
1697 * for multibyte types... the pointer is not aligned. Use
1698 * get_unaligned((type *)iterator.this_arg) to dereference
1699 * iterator.this_arg for type "type" safely on all arches.
1700 */
1701 case IEEE80211_RADIOTAP_FLAGS:
1702 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1703 /*
1704 * this indicates that the skb we have been
1705 * handed has the 32-bit FCS CRC at the end...
1706 * we should react to that by snipping it off
1707 * because it will be recomputed and added
1708 * on transmission
1709 */
1710 if (skb->len < (iterator._max_length + FCS_LEN))
1711 return false;
1712
1713 skb_trim(skb, skb->len - FCS_LEN);
1714 }
1715 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1716 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1717 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1718 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1719 break;
1720
1721 case IEEE80211_RADIOTAP_TX_FLAGS:
1722 txflags = get_unaligned_le16(iterator.this_arg);
1723 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1724 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1725 break;
1726
1727 /*
1728 * Please update the file
1729 * Documentation/networking/mac80211-injection.txt
1730 * when parsing new fields here.
1731 */
1732
1733 default:
1734 break;
1735 }
1736 }
1737
1738 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1739 return false;
1740
1741 /*
1742 * remove the radiotap header
1743 * iterator->_max_length was sanity-checked against
1744 * skb->len by iterator init
1745 */
1746 skb_pull(skb, iterator._max_length);
1747
1748 return true;
1749}
1750
d0cf9c0d
SH		 1751netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1752 struct net_device *dev)
e2ebc74d
JB		 1753{
1754 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a 1755 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d
JB		 1756 struct ieee80211_radiotap_header *prthdr =
1757 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1758 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1759 struct ieee80211_hdr *hdr;
5d9cf4a5 1760 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
b4932836 1761 struct cfg80211_chan_def *chandef;
9b8a74e3 1762 u16 len_rthdr;
5d9cf4a5 1763 int hdrlen;
e2ebc74d 1764
9b8a74e3
AG		 1765 /* check for not even having the fixed radiotap header part */
1766 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1767 goto fail; /* too short to be possibly valid */
1768
1769 /* is it a header version we can trust to find length from? */
1770 if (unlikely(prthdr->it_version))
1771 goto fail; /* only version 0 is supported */
1772
1773 /* then there must be a radiotap header with a length we can use */
1774 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1775
1776 /* does the skb contain enough to deliver on the alleged length? */
1777 if (unlikely(skb->len < len_rthdr))
1778 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1779
e2ebc74d
JB		 1780 /*
1781 * fix up the pointers accounting for the radiotap
1782 * header still being in there. We are being given
1783 * a precooked IEEE80211 header so no need for
1784 * normal processing
1785 */
9b8a74e3 1786 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1787 /*
9b8a74e3
AG		 1788 * these are just fixed to the end of the rt area since we
1789 * don't have any better information and at this point, nobody cares
e2ebc74d 1790 */
9b8a74e3
AG		 1791 skb_set_network_header(skb, len_rthdr);
1792 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1793
5d9cf4a5
JB		 1794 if (skb->len < len_rthdr + 2)
1795 goto fail;
1796
1797 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1798 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1799
1800 if (skb->len < len_rthdr + hdrlen)
1801 goto fail;
1802
f75f5c6f
HS		 1803 /*
1804 * Initialize skb->protocol if the injected frame is a data frame
1805 * carrying a rfc1042 header
1806 */
5d9cf4a5
JB		 1807 if (ieee80211_is_data(hdr->frame_control) &&
1808 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1809 u8 *payload = (u8 *)hdr + hdrlen;
1810
b203ca39 1811 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1812 skb->protocol = cpu_to_be16((payload[6] << 8) |
1813 payload[7]);
f75f5c6f
HS		 1814 }
1815
3b8d81e0
JB		 1816 memset(info, 0, sizeof(*info));
1817
5d9cf4a5 1818 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1819 IEEE80211_TX_CTL_INJECTED;
1820
1821 /* process and remove the injection radiotap header */
1822 if (!ieee80211_parse_tx_radiotap(skb))
1823 goto fail;
5d9cf4a5
JB		 1824
1825 rcu_read_lock();
1826
1827 /*
1828 * We process outgoing injected frames that have a local address
1829 * we handle as though they are non-injected frames.
1830 * This code here isn't entirely correct, the local MAC address
1831 * isn't always enough to find the interface to use; for proper
1832 * VLAN/WDS support we will need a different mechanism (which
1833 * likely isn't going to be monitor interfaces).
1834 */
1835 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1836
1837 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1838 if (!ieee80211_sdata_running(tmp_sdata))
1839 continue;
1840 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1841 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1842 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1843 continue;
b203ca39 1844 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1845 sdata = tmp_sdata;
1846 break;
1847 }
1848 }
7351c6bd 1849
55de908a
JB		 1850 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1851 if (!chanctx_conf) {
1852 tmp_sdata = rcu_dereference(local->monitor_sdata);
1853 if (tmp_sdata)
1854 chanctx_conf =
1855 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1856 }
55de908a 1857
b4a7ff75 1858 if (chanctx_conf)
b4932836 1859 chandef = &chanctx_conf->def;
b4a7ff75 1860 else if (!local->use_chanctx)
b4932836 1861 chandef = &local->_oper_chandef;
b4a7ff75
FF		 1862 else
1863 goto fail_rcu;
55de908a
JB		 1864
1865 /*
1866 * Frame injection is not allowed if beaconing is not allowed
1867 * or if we need radar detection. Beaconing is usually not allowed when
1868 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1869 * Passive scan is also used in world regulatory domains where
1870 * your country is not known and as such it should be treated as
1871 * NO TX unless the channel is explicitly allowed in which case
1872 * your current regulatory domain would not have the passive scan
1873 * flag.
1874 *
1875 * Since AP mode uses monitor interfaces to inject/TX management
1876 * frames we can make AP mode the exception to this rule once it
1877 * supports radar detection as its implementation can deal with
1878 * radar detection by itself. We can do that later by adding a
1879 * monitor flag interfaces used for AP support.
1880 */
b4932836
JD		 1881 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1882 sdata->vif.type))
55de908a
JB		 1883 goto fail_rcu;
1884
73c4e195 1885 info->band = chandef->chan->band;
7c10770f 1886 ieee80211_xmit(sdata, NULL, skb);
5d9cf4a5
JB		 1887 rcu_read_unlock();
1888
e2ebc74d 1889 return NETDEV_TX_OK;
9b8a74e3 1890
55de908a
JB		 1891fail_rcu:
1892 rcu_read_unlock();
9b8a74e3
AG		 1893fail:
1894 dev_kfree_skb(skb);
1895 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1896}
1897
97ffe757 1898static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
ad38bfc9 1899{
97ffe757 1900 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
ad38bfc9 1901
97ffe757
JB		 1902 return ethertype == ETH_P_TDLS &&
1903 skb->len > 14 &&
1904 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1905}
1906
1907static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1908 struct sk_buff *skb,
1909 struct sta_info **sta_out)
1910{
1911 struct sta_info *sta;
1912
1913 switch (sdata->vif.type) {
1914 case NL80211_IFTYPE_AP_VLAN:
1915 sta = rcu_dereference(sdata->u.vlan.sta);
1916 if (sta) {
1917 *sta_out = sta;
1918 return 0;
1919 } else if (sdata->wdev.use_4addr) {
1920 return -ENOLINK;
1921 }
1922 /* fall through */
1923 case NL80211_IFTYPE_AP:
1924 case NL80211_IFTYPE_OCB:
1925 case NL80211_IFTYPE_ADHOC:
1926 if (is_multicast_ether_addr(skb->data)) {
1927 *sta_out = ERR_PTR(-ENOENT);
1928 return 0;
1929 }
1930 sta = sta_info_get_bss(sdata, skb->data);
1931 break;
1932 case NL80211_IFTYPE_WDS:
1933 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
1934 break;
1935#ifdef CONFIG_MAC80211_MESH
1936 case NL80211_IFTYPE_MESH_POINT:
1937 /* determined much later */
1938 *sta_out = NULL;
1939 return 0;
1940#endif
1941 case NL80211_IFTYPE_STATION:
1942 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1943 sta = sta_info_get(sdata, skb->data);
1944 if (sta) {
1945 bool tdls_peer, tdls_auth;
1946
1947 tdls_peer = test_sta_flag(sta,
1948 WLAN_STA_TDLS_PEER);
1949 tdls_auth = test_sta_flag(sta,
1950 WLAN_STA_TDLS_PEER_AUTH);
1951
1952 if (tdls_peer && tdls_auth) {
1953 *sta_out = sta;
1954 return 0;
1955 }
1956
1957 /*
1958 * TDLS link during setup - throw out frames to
1959 * peer. Allow TDLS-setup frames to unauthorized
1960 * peers for the special case of a link teardown
1961 * after a TDLS sta is removed due to being
1962 * unreachable.
1963 */
1964 if (tdls_peer && !tdls_auth &&
1965 !ieee80211_is_tdls_setup(skb))
1966 return -EINVAL;
1967 }
1968
1969 }
1970
1971 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
1972 if (!sta)
1973 return -ENOLINK;
1974 break;
1975 default:
1976 return -EINVAL;
1977 }
1978
1979 *sta_out = sta ?: ERR_PTR(-ENOENT);
1980 return 0;
ad38bfc9
MG		 1981}
1982
e2ebc74d 1983/**
4c9451ed
JB		 1984 * ieee80211_build_hdr - build 802.11 header in the given frame
1985 * @sdata: virtual interface to build the header for
1986 * @skb: the skb to build the header in
24d342c5 1987 * @info_flags: skb flags to set
e2ebc74d 1988 *
4c9451ed
JB		 1989 * This function takes the skb with 802.3 header and reformats the header to
1990 * the appropriate IEEE 802.11 header based on which interface the packet is
1991 * being transmitted on.
1992 *
1993 * Note that this function also takes care of the TX status request and
1994 * potential unsharing of the SKB - this needs to be interleaved with the
1995 * header building.
e2ebc74d 1996 *
4c9451ed
JB		 1997 * The function requires the read-side RCU lock held
1998 *
1999 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
e2ebc74d 2000 */
4c9451ed 2001static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
7c10770f 2002 struct sk_buff *skb, u32 info_flags,
97ffe757 2003 struct sta_info *sta)
e2ebc74d 2004{
133b8226 2005 struct ieee80211_local *local = sdata->local;
489ee919 2006 struct ieee80211_tx_info *info;
dcf33963 2007 int head_need;
065e9605
HH		 2008 u16 ethertype, hdrlen, meshhdrlen = 0;
2009 __le16 fc;
e2ebc74d 2010 struct ieee80211_hdr hdr;
ff67bb86 2011 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 2012 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 2013 const u8 *encaps_data;
2014 int encaps_len, skip_header_bytes;
e8bf9649 2015 int nh_pos, h_pos;
97ffe757
JB		 2016 bool wme_sta = false, authorized = false;
2017 bool tdls_peer;
a729cff8 2018 bool multicast;
a729cff8 2019 u16 info_id = 0;
55de908a
JB		 2020 struct ieee80211_chanctx_conf *chanctx_conf;
2021 struct ieee80211_sub_if_data *ap_sdata;
2022 enum ieee80211_band band;
4c9451ed 2023 int ret;
e2ebc74d 2024
97ffe757
JB		 2025 if (IS_ERR(sta))
2026 sta = NULL;
2027
e2ebc74d
JB		 2028 /* convert Ethernet header to proper 802.11 header (based on
2029 * operation mode) */
2030 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 2031 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 2032
51fb61e7 2033 switch (sdata->vif.type) {
05c914fe 2034 case NL80211_IFTYPE_AP_VLAN:
97ffe757 2035 if (sdata->wdev.use_4addr) {
f14543ee
FF		 2036 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2037 /* RA TA DA SA */
2038 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 2039 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2040 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2041 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2042 hdrlen = 30;
c2c98fde 2043 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
a74a8c84 2044 wme_sta = sta->sta.wme;
f14543ee 2045 }
55de908a
JB		 2046 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2047 u.ap);
2048 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
4c9451ed
JB		 2049 if (!chanctx_conf) {
2050 ret = -ENOTCONN;
2051 goto free;
2052 }
4bf88530 2053 band = chanctx_conf->def.chan->band;
97ffe757 2054 if (sdata->wdev.use_4addr)
f14543ee
FF		 2055 break;
2056 /* fall through */
2057 case NL80211_IFTYPE_AP:
fe80123d
AB		 2058 if (sdata->vif.type == NL80211_IFTYPE_AP)
2059 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2060 if (!chanctx_conf) {
2061 ret = -ENOTCONN;
2062 goto free;
2063 }
065e9605 2064 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 2065 /* DA BSSID SA */
2066 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 2067 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2068 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2069 hdrlen = 24;
4bf88530 2070 band = chanctx_conf->def.chan->band;
cf966838 2071 break;
05c914fe 2072 case NL80211_IFTYPE_WDS:
065e9605 2073 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 2074 /* RA TA DA SA */
2075 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 2076 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2077 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2078 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2079 hdrlen = 30;
55de908a
JB		 2080 /*
2081 * This is the exception! WDS style interfaces are prohibited
2082 * when channel contexts are in used so this must be valid
2083 */
675a0b04 2084 band = local->hw.conf.chandef.chan->band;
cf966838 2085 break;
33b64eb2 2086#ifdef CONFIG_MAC80211_MESH
05c914fe 2087 case NL80211_IFTYPE_MESH_POINT:
b8bacc18 2088 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 2089 struct sta_info *next_hop;
2090 bool mpp_lookup = true;
2091
bf7cd94d 2092 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 2093 if (mpath) {
2094 mpp_lookup = false;
2095 next_hop = rcu_dereference(mpath->next_hop);
2096 if (!next_hop ||
2097 !(mpath->flags & (MESH_PATH_ACTIVE |
2098 MESH_PATH_RESOLVING)))
2099 mpp_lookup = true;
2100 }
2101
2102 if (mpp_lookup)
bf7cd94d 2103 mppath = mpp_path_lookup(sdata, skb->data);
163df6cf
CYY		 2104
2105 if (mppath && mpath)
2106 mesh_path_del(mpath->sdata, mpath->dst);
b8bacc18 2107 }
79617dee 2108
f76b57b4 2109 /*
9d52501b
JF		 2110 * Use address extension if it is a packet from
2111 * another interface or if we know the destination
2112 * is being proxied by a portal (i.e. portal address
2113 * differs from proxied address)
f76b57b4 2114 */
b203ca39
JP		 2115 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2116 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 2117 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2118 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 2119 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2120 NULL, NULL);
79617dee 2121 } else {
27f01124
TP		 2122 /* DS -> MBSS (802.11-2012 13.11.3.3).
2123 * For unicast with unknown forwarding information,
2124 * destination might be in the MBSS or if that fails
2125 * forwarded to another mesh gate. In either case
2126 * resolution will be handled in ieee80211_xmit(), so
2127 * leave the original DA. This also works for mcast */
2128 const u8 *mesh_da = skb->data;
2129
2130 if (mppath)
2131 mesh_da = mppath->mpp;
2132 else if (mpath)
2133 mesh_da = mpath->dst;
79617dee 2134
3c5772a5 2135 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 2136 mesh_da, sdata->vif.addr);
27f01124
TP		 2137 if (is_multicast_ether_addr(mesh_da))
2138 /* DA TA mSA AE:SA */
bf7cd94d
JB		 2139 meshhdrlen = ieee80211_new_mesh_header(
2140 sdata, &mesh_hdr,
2141 skb->data + ETH_ALEN, NULL);
3c5772a5 2142 else
27f01124 2143 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 2144 meshhdrlen = ieee80211_new_mesh_header(
2145 sdata, &mesh_hdr, skb->data,
2146 skb->data + ETH_ALEN);
79617dee 2147
79617dee 2148 }
55de908a 2149 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2150 if (!chanctx_conf) {
2151 ret = -ENOTCONN;
2152 goto free;
2153 }
4bf88530 2154 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 2155 break;
2156#endif
05c914fe 2157 case NL80211_IFTYPE_STATION:
97ffe757
JB		 2158 /* we already did checks when looking up the RA STA */
2159 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
941c93cd 2160
97ffe757 2161 if (tdls_peer) {
941c93cd
AN		 2162 /* DA SA BSSID */
2163 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2164 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2165 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2166 hdrlen = 24;
2167 } else if (sdata->u.mgd.use_4addr &&
2168 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2169 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2170 IEEE80211_FCTL_TODS);
f14543ee 2171 /* RA TA DA SA */
941c93cd 2172 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 2173 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2174 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2175 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2176 hdrlen = 30;
2177 } else {
2178 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2179 /* BSSID SA DA */
941c93cd 2180 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 2181 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2182 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2183 hdrlen = 24;
2184 }
55de908a 2185 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2186 if (!chanctx_conf) {
2187 ret = -ENOTCONN;
2188 goto free;
2189 }
4bf88530 2190 band = chanctx_conf->def.chan->band;
cf966838 2191 break;
239281f8
RL		 2192 case NL80211_IFTYPE_OCB:
2193 /* DA SA BSSID */
2194 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2195 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2196 eth_broadcast_addr(hdr.addr3);
2197 hdrlen = 24;
2198 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2199 if (!chanctx_conf) {
2200 ret = -ENOTCONN;
2201 goto free;
2202 }
239281f8
RL		 2203 band = chanctx_conf->def.chan->band;
2204 break;
05c914fe 2205 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 2206 /* DA SA BSSID */
2207 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2208 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 2209 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 2210 hdrlen = 24;
55de908a 2211 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2212 if (!chanctx_conf) {
2213 ret = -ENOTCONN;
2214 goto free;
2215 }
4bf88530 2216 band = chanctx_conf->def.chan->band;
cf966838
JB		 2217 break;
2218 default:
4c9451ed
JB		 2219 ret = -EINVAL;
2220 goto free;
e2ebc74d
JB		 2221 }
2222
a729cff8 2223 multicast = is_multicast_ether_addr(hdr.addr1);
e2ebc74d 2224
97ffe757
JB		 2225 /* sta is always NULL for mesh */
2226 if (sta) {
2227 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2228 wme_sta = sta->sta.wme;
2229 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2230 /* For mesh, the use of the QoS header is mandatory */
c2c98fde 2231 wme_sta = true;
97ffe757 2232 }
4777be41 2233
527871d7
JB		 2234 /* receiver does QoS (which also means we do) use it */
2235 if (wme_sta) {
065e9605 2236 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 2237 hdrlen += 2;
2238 }
2239
2240 /*
238814fd
JB		 2241 * Drop unicast frames to unauthorised stations unless they are
2242 * EAPOL frames from the local station.
ce3edf6d 2243 */
55182e4a 2244 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
239281f8 2245 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
a6ececf4 2246 !multicast && !authorized &&
55182e4a 2247 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 2248 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 2249#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 2250 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
4c9451ed 2251 sdata->name, hdr.addr1);
ce3edf6d
JB		 2252#endif
2253
2254 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2255
4c9451ed
JB		 2256 ret = -EPERM;
2257 goto free;
ce3edf6d
JB		 2258 }
2259
a729cff8
JB		 2260 if (unlikely(!multicast && skb->sk &&
2261 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
bf7fa551 2262 struct sk_buff *ack_skb = skb_clone_sk(skb);
a729cff8 2263
bf7fa551 2264 if (ack_skb) {
a729cff8 2265 unsigned long flags;
9475af6e 2266 int id;
a729cff8
JB		 2267
2268 spin_lock_irqsave(&local->ack_status_lock, flags);
bf7fa551 2269 id = idr_alloc(&local->ack_status_frames, ack_skb,
9475af6e 2270 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2271 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2272
9475af6e 2273 if (id >= 0) {
a729cff8
JB		 2274 info_id = id;
2275 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
a729cff8 2276 } else {
bf7fa551 2277 kfree_skb(ack_skb);
a729cff8 2278 }
a729cff8
JB		 2279 }
2280 }
2281
7e244707
HS		 2282 /*
2283 * If the skb is shared we need to obtain our own copy.
2284 */
2285 if (skb_shared(skb)) {
a729cff8
JB		 2286 struct sk_buff *tmp_skb = skb;
2287
2288 /* can't happen -- skb is a clone if info_id != 0 */
2289 WARN_ON(info_id);
2290
f8a0a781 2291 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2292 kfree_skb(tmp_skb);
2293
4c9451ed
JB		 2294 if (!skb) {
2295 ret = -ENOMEM;
2296 goto free;
2297 }
7e244707
HS		 2298 }
2299
065e9605 2300 hdr.frame_control = fc;
e2ebc74d
JB		 2301 hdr.duration_id = 0;
2302 hdr.seq_ctrl = 0;
2303
2304 skip_header_bytes = ETH_HLEN;
2305 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2306 encaps_data = bridge_tunnel_header;
2307 encaps_len = sizeof(bridge_tunnel_header);
2308 skip_header_bytes -= 2;
e5c5d22e 2309 } else if (ethertype >= ETH_P_802_3_MIN) {
e2ebc74d
JB		 2310 encaps_data = rfc1042_header;
2311 encaps_len = sizeof(rfc1042_header);
2312 skip_header_bytes -= 2;
2313 } else {
2314 encaps_data = NULL;
2315 encaps_len = 0;
2316 }
2317
7e244707
HS		 2318 nh_pos = skb_network_header(skb) - skb->data;
2319 h_pos = skb_transport_header(skb) - skb->data;
2320
e2ebc74d
JB		 2321 skb_pull(skb, skip_header_bytes);
2322 nh_pos -= skip_header_bytes;
2323 h_pos -= skip_header_bytes;
2324
23c0752a 2325 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2326
23c0752a
JB		 2327 /*
2328 * So we need to modify the skb header and hence need a copy of
2329 * that. The head_need variable above doesn't, so far, include
2330 * the needed header space that we don't need right away. If we
2331 * can, then we don't reallocate right now but only after the
2332 * frame arrives at the master device (if it does...)
2333 *
2334 * If we cannot, however, then we will reallocate to include all
2335 * the ever needed space. Also, if we need to reallocate it anyway,
2336 * make it big enough for everything we may ever need.
2337 */
e2ebc74d 2338
3a5be7d4 2339 if (head_need > 0 || skb_cloned(skb)) {
2475b1cc 2340 head_need += sdata->encrypt_headroom;
23c0752a
JB		 2341 head_need += local->tx_headroom;
2342 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2343 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2344 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2345 skb = NULL;
4c9451ed 2346 return ERR_PTR(-ENOMEM);
c3e7724b 2347 }
e2ebc74d
JB		 2348 }
2349
2350 if (encaps_data) {
2351 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2352 nh_pos += encaps_len;
2353 h_pos += encaps_len;
2354 }
c29b9b9b 2355
e4ab7eb0 2356#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2357 if (meshhdrlen > 0) {
2358 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2359 nh_pos += meshhdrlen;
2360 h_pos += meshhdrlen;
2361 }
e4ab7eb0 2362#endif
33b64eb2 2363
065e9605 2364 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2365 __le16 *qos_control;
2366
f359d3fe 2367 qos_control = (__le16 *) skb_push(skb, 2);
c29b9b9b
JB		 2368 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2369 /*
2370 * Maybe we could actually set some fields here, for now just
2371 * initialise to zero to indicate no special operation.
2372 */
2373 *qos_control = 0;
2374 } else
2375 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2376
e2ebc74d
JB		 2377 nh_pos += hdrlen;
2378 h_pos += hdrlen;
2379
e2ebc74d
JB		 2380 /* Update skb pointers to various headers since this modified frame
2381 * is going to go through Linux networking code that may potentially
2382 * need things like pointer to IP header. */
2383 skb_set_mac_header(skb, 0);
2384 skb_set_network_header(skb, nh_pos);
2385 skb_set_transport_header(skb, h_pos);
2386
489ee919 2387 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2388 memset(info, 0, sizeof(*info));
2389
a729cff8
JB		 2390 info->flags = info_flags;
2391 info->ack_frame_id = info_id;
73c4e195 2392 info->band = band;
a729cff8 2393
4c9451ed
JB		 2394 return skb;
2395 free:
2396 kfree_skb(skb);
2397 return ERR_PTR(ret);
2398}
2399
17c18bf8
JB		 2400/*
2401 * fast-xmit overview
2402 *
2403 * The core idea of this fast-xmit is to remove per-packet checks by checking
2404 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2405 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2406 * much less work can be done per packet. For example, fragmentation must be
2407 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2408 * in the code here.
2409 *
2410 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2411 * header and other data to aid packet processing in ieee80211_xmit_fast().
2412 *
2413 * The most difficult part of this is that when any of these assumptions
2414 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2415 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2416 * since the per-packet code no longer checks the conditions. This is reflected
2417 * by the calls to these functions throughout the rest of the code, and must be
2418 * maintained if any of the TX path checks change.
2419 */
2420
2421void ieee80211_check_fast_xmit(struct sta_info *sta)
2422{
2423 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2424 struct ieee80211_local *local = sta->local;
2425 struct ieee80211_sub_if_data *sdata = sta->sdata;
2426 struct ieee80211_hdr *hdr = (void *)build.hdr;
2427 struct ieee80211_chanctx_conf *chanctx_conf;
2428 __le16 fc;
2429
30686bf7 2430 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
17c18bf8
JB		 2431 return;
2432
2433 /* Locking here protects both the pointer itself, and against concurrent
2434 * invocations winning data access races to, e.g., the key pointer that
2435 * is used.
2436 * Without it, the invocation of this function right after the key
2437 * pointer changes wouldn't be sufficient, as another CPU could access
2438 * the pointer, then stall, and then do the cache update after the CPU
2439 * that invalidated the key.
2440 * With the locking, such scenarios cannot happen as the check for the
2441 * key and the fast-tx assignment are done atomically, so the CPU that
2442 * modifies the key will either wait or other one will see the key
2443 * cleared/changed already.
2444 */
2445 spin_lock_bh(&sta->lock);
30686bf7
JB		 2446 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2447 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
17c18bf8
JB		 2448 sdata->vif.type == NL80211_IFTYPE_STATION)
2449 goto out;
2450
2451 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2452 goto out;
2453
2454 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2455 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
f7418bc1
FF		 2456 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2457 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
17c18bf8
JB		 2458 goto out;
2459
2460 if (sdata->noack_map)
2461 goto out;
2462
2463 /* fast-xmit doesn't handle fragmentation at all */
725b812c
JB		 2464 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2465 !local->ops->set_frag_threshold)
17c18bf8
JB		 2466 goto out;
2467
2468 rcu_read_lock();
2469 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2470 if (!chanctx_conf) {
2471 rcu_read_unlock();
2472 goto out;
2473 }
2474 build.band = chanctx_conf->def.chan->band;
2475 rcu_read_unlock();
2476
2477 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2478
2479 switch (sdata->vif.type) {
3ffd8840
JB		 2480 case NL80211_IFTYPE_ADHOC:
2481 /* DA SA BSSID */
2482 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2483 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2484 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2485 build.hdr_len = 24;
2486 break;
17c18bf8
JB		 2487 case NL80211_IFTYPE_STATION:
2488 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2489 /* DA SA BSSID */
2490 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2491 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2492 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2493 build.hdr_len = 24;
2494 break;
2495 }
2496
2497 if (sdata->u.mgd.use_4addr) {
2498 /* non-regular ethertype cannot use the fastpath */
2499 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2500 IEEE80211_FCTL_TODS);
2501 /* RA TA DA SA */
2502 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2503 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2504 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2505 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2506 build.hdr_len = 30;
2507 break;
2508 }
2509 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2510 /* BSSID SA DA */
2511 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2512 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2513 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2514 build.hdr_len = 24;
2515 break;
2516 case NL80211_IFTYPE_AP_VLAN:
2517 if (sdata->wdev.use_4addr) {
2518 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2519 IEEE80211_FCTL_TODS);
2520 /* RA TA DA SA */
2521 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2522 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2523 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2524 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2525 build.hdr_len = 30;
2526 break;
2527 }
2528 /* fall through */
2529 case NL80211_IFTYPE_AP:
2530 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2531 /* DA BSSID SA */
2532 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2533 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2534 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2535 build.hdr_len = 24;
2536 break;
2537 default:
2538 /* not handled on fast-xmit */
2539 goto out;
2540 }
2541
2542 if (sta->sta.wme) {
2543 build.hdr_len += 2;
2544 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2545 }
2546
2547 /* We store the key here so there's no point in using rcu_dereference()
2548 * but that's fine because the code that changes the pointers will call
2549 * this function after doing so. For a single CPU that would be enough,
2550 * for multiple see the comment above.
2551 */
2552 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2553 if (!build.key)
2554 build.key = rcu_access_pointer(sdata->default_unicast_key);
2555 if (build.key) {
e495c247 2556 bool gen_iv, iv_spc, mmic;
17c18bf8
JB		 2557
2558 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2559 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
e495c247 2560 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
17c18bf8
JB		 2561
2562 /* don't handle software crypto */
2563 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2564 goto out;
2565
2566 switch (build.key->conf.cipher) {
2567 case WLAN_CIPHER_SUITE_CCMP:
2568 case WLAN_CIPHER_SUITE_CCMP_256:
2569 /* add fixed key ID */
2570 if (gen_iv) {
2571 (build.hdr + build.hdr_len)[3] =
2572 0x20 | (build.key->conf.keyidx << 6);
2573 build.pn_offs = build.hdr_len;
2574 }
2575 if (gen_iv || iv_spc)
2576 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2577 break;
2578 case WLAN_CIPHER_SUITE_GCMP:
2579 case WLAN_CIPHER_SUITE_GCMP_256:
2580 /* add fixed key ID */
2581 if (gen_iv) {
2582 (build.hdr + build.hdr_len)[3] =
2583 0x20 | (build.key->conf.keyidx << 6);
2584 build.pn_offs = build.hdr_len;
2585 }
2586 if (gen_iv || iv_spc)
2587 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2588 break;
e495c247
JB		 2589 case WLAN_CIPHER_SUITE_TKIP:
2590 /* cannot handle MMIC or IV generation in xmit-fast */
2591 if (mmic || gen_iv)
2592 goto out;
2593 if (iv_spc)
2594 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2595 break;
2596 case WLAN_CIPHER_SUITE_WEP40:
2597 case WLAN_CIPHER_SUITE_WEP104:
2598 /* cannot handle IV generation in fast-xmit */
2599 if (gen_iv)
2600 goto out;
2601 if (iv_spc)
2602 build.hdr_len += IEEE80211_WEP_IV_LEN;
2603 break;
2604 case WLAN_CIPHER_SUITE_AES_CMAC:
2605 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2606 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2607 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2608 WARN(1,
2609 "management cipher suite 0x%x enabled for data\n",
2610 build.key->conf.cipher);
17c18bf8 2611 goto out;
e495c247
JB		 2612 default:
2613 /* we don't know how to generate IVs for this at all */
2614 if (WARN_ON(gen_iv))
2615 goto out;
2616 /* pure hardware keys are OK, of course */
2617 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2618 break;
2619 /* cipher scheme might require space allocation */
2620 if (iv_spc &&
2621 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2622 goto out;
2623 if (iv_spc)
2624 build.hdr_len += build.key->conf.iv_len;
17c18bf8
JB		 2625 }
2626
2627 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2628 }
2629
2630 hdr->frame_control = fc;
2631
2632 memcpy(build.hdr + build.hdr_len,
2633 rfc1042_header, sizeof(rfc1042_header));
2634 build.hdr_len += sizeof(rfc1042_header);
2635
2636 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2637 /* if the kmemdup fails, continue w/o fast_tx */
2638 if (!fast_tx)
2639 goto out;
2640
2641 out:
2642 /* we might have raced against another call to this function */
2643 old = rcu_dereference_protected(sta->fast_tx,
2644 lockdep_is_held(&sta->lock));
2645 rcu_assign_pointer(sta->fast_tx, fast_tx);
2646 if (old)
2647 kfree_rcu(old, rcu_head);
2648 spin_unlock_bh(&sta->lock);
2649}
2650
2651void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2652{
2653 struct sta_info *sta;
2654
2655 rcu_read_lock();
2656 list_for_each_entry_rcu(sta, &local->sta_list, list)
2657 ieee80211_check_fast_xmit(sta);
2658 rcu_read_unlock();
2659}
2660
2661void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2662{
2663 struct ieee80211_local *local = sdata->local;
2664 struct sta_info *sta;
2665
2666 rcu_read_lock();
2667
2668 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2669 if (sdata != sta->sdata &&
2670 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2671 continue;
2672 ieee80211_check_fast_xmit(sta);
2673 }
2674
2675 rcu_read_unlock();
2676}
2677
2678void ieee80211_clear_fast_xmit(struct sta_info *sta)
2679{
2680 struct ieee80211_fast_tx *fast_tx;
2681
2682 spin_lock_bh(&sta->lock);
2683 fast_tx = rcu_dereference_protected(sta->fast_tx,
2684 lockdep_is_held(&sta->lock));
2685 RCU_INIT_POINTER(sta->fast_tx, NULL);
2686 spin_unlock_bh(&sta->lock);
2687
2688 if (fast_tx)
2689 kfree_rcu(fast_tx, rcu_head);
2690}
2691
2692static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2693 struct net_device *dev, struct sta_info *sta,
2694 struct ieee80211_fast_tx *fast_tx,
2695 struct sk_buff *skb)
2696{
2697 struct ieee80211_local *local = sdata->local;
2698 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2699 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2700 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2701 struct ethhdr eth;
2702 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2703 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2704 struct ieee80211_tx_data tx;
2705 ieee80211_tx_result r;
2706 struct tid_ampdu_tx *tid_tx = NULL;
2707 u8 tid = IEEE80211_NUM_TIDS;
2708
2709 /* control port protocol needs a lot of special handling */
2710 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2711 return false;
2712
2713 /* only RFC 1042 SNAP */
2714 if (ethertype < ETH_P_802_3_MIN)
2715 return false;
2716
2717 /* don't handle TX status request here either */
2718 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2719 return false;
2720
2721 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2722 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2723 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
472be00d
JB		 2724 if (tid_tx) {
2725 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2726 return false;
2727 if (tid_tx->timeout)
2728 tid_tx->last_tx = jiffies;
2729 }
17c18bf8
JB		 2730 }
2731
2732 /* after this point (skb is modified) we cannot return false */
2733
2734 if (skb_shared(skb)) {
2735 struct sk_buff *tmp_skb = skb;
2736
2737 skb = skb_clone(skb, GFP_ATOMIC);
2738 kfree_skb(tmp_skb);
2739
2740 if (!skb)
2741 return true;
2742 }
2743
5a490510 2744 ieee80211_tx_stats(dev, skb->len + extra_head);
17c18bf8
JB		 2745
2746 /* will not be crypto-handled beyond what we do here, so use false
2747 * as the may-encrypt argument for the resize to not account for
2748 * more room than we already have in 'extra_head'
2749 */
2750 if (unlikely(ieee80211_skb_resize(sdata, skb,
2751 max_t(int, extra_head + hw_headroom -
2752 skb_headroom(skb), 0),
2753 false))) {
2754 kfree_skb(skb);
2755 return true;
2756 }
2757
2758 memcpy(&eth, skb->data, ETH_HLEN - 2);
2759 hdr = (void *)skb_push(skb, extra_head);
2760 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2761 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2762 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2763
2764 memset(info, 0, sizeof(*info));
2765 info->band = fast_tx->band;
2766 info->control.vif = &sdata->vif;
2767 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2768 IEEE80211_TX_CTL_DONTFRAG |
2769 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2770
2771 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2772 *ieee80211_get_qos_ctl(hdr) = tid;
50f36ae6
FF		 2773 if (!sta->sta.txq[0])
2774 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
17c18bf8
JB		 2775 } else {
2776 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2777 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2778 sdata->sequence_number += 0x10;
2779 }
2780
ccc6bb96 2781 if (skb_shinfo(skb)->gso_size)
e5a9f8d0 2782 sta->tx_stats.msdu[tid] +=
ccc6bb96
JB		 2783 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
2784 else
e5a9f8d0 2785 sta->tx_stats.msdu[tid]++;
17c18bf8
JB		 2786
2787 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2788
2789 __skb_queue_head_init(&tx.skbs);
2790
2791 tx.flags = IEEE80211_TX_UNICAST;
2792 tx.local = local;
2793 tx.sdata = sdata;
2794 tx.sta = sta;
2795 tx.key = fast_tx->key;
2796
2797 if (fast_tx->key)
2798 info->control.hw_key = &fast_tx->key->conf;
2799
30686bf7 2800 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
17c18bf8
JB		 2801 tx.skb = skb;
2802 r = ieee80211_tx_h_rate_ctrl(&tx);
2803 skb = tx.skb;
2804 tx.skb = NULL;
2805
2806 if (r != TX_CONTINUE) {
2807 if (r != TX_QUEUED)
2808 kfree_skb(skb);
2809 return true;
2810 }
2811 }
2812
2813 /* statistics normally done by ieee80211_tx_h_stats (but that
2814 * has to consider fragmentation, so is more complex)
2815 */
e5a9f8d0
JB		 2816 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
2817 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
17c18bf8
JB		 2818
2819 if (fast_tx->pn_offs) {
2820 u64 pn;
2821 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2822
2823 switch (fast_tx->key->conf.cipher) {
2824 case WLAN_CIPHER_SUITE_CCMP:
2825 case WLAN_CIPHER_SUITE_CCMP_256:
17c18bf8
JB		 2826 case WLAN_CIPHER_SUITE_GCMP:
2827 case WLAN_CIPHER_SUITE_GCMP_256:
db388a56 2828 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
17c18bf8
JB		 2829 crypto_hdr[0] = pn;
2830 crypto_hdr[1] = pn >> 8;
2831 crypto_hdr[4] = pn >> 16;
2832 crypto_hdr[5] = pn >> 24;
2833 crypto_hdr[6] = pn >> 32;
2834 crypto_hdr[7] = pn >> 40;
2835 break;
2836 }
2837 }
2838
2839 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2840 sdata = container_of(sdata->bss,
2841 struct ieee80211_sub_if_data, u.ap);
2842
2843 __skb_queue_tail(&tx.skbs, skb);
2844 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2845 return true;
2846}
2847
4c9451ed
JB		 2848void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2849 struct net_device *dev,
2850 u32 info_flags)
2851{
2852 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
97ffe757 2853 struct sta_info *sta;
80616c0d 2854 struct sk_buff *next;
4c9451ed
JB		 2855
2856 if (unlikely(skb->len < ETH_HLEN)) {
2857 kfree_skb(skb);
2858 return;
2859 }
2860
2861 rcu_read_lock();
e2ebc74d 2862
2d981fdd
JB		 2863 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2864 goto out_free;
4c9451ed 2865
17c18bf8
JB		 2866 if (!IS_ERR_OR_NULL(sta)) {
2867 struct ieee80211_fast_tx *fast_tx;
2868
2869 fast_tx = rcu_dereference(sta->fast_tx);
2870
2871 if (fast_tx &&
2872 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2873 goto out;
2874 }
2875
80616c0d
JB		 2876 if (skb_is_gso(skb)) {
2877 struct sk_buff *segs;
680a0dab 2878
80616c0d
JB		 2879 segs = skb_gso_segment(skb, 0);
2880 if (IS_ERR(segs)) {
2d981fdd 2881 goto out_free;
80616c0d
JB		 2882 } else if (segs) {
2883 consume_skb(skb);
2884 skb = segs;
2885 }
2886 } else {
2887 /* we cannot process non-linear frames on this path */
2888 if (skb_linearize(skb)) {
2889 kfree_skb(skb);
2890 goto out;
2891 }
2892
2893 /* the frame could be fragmented, software-encrypted, and other
2894 * things so we cannot really handle checksum offload with it -
2895 * fix it up in software before we handle anything else.
2896 */
2897 if (skb->ip_summed == CHECKSUM_PARTIAL) {
f603f1f3
JB		 2898 skb_set_transport_header(skb,
2899 skb_checksum_start_offset(skb));
80616c0d
JB		 2900 if (skb_checksum_help(skb))
2901 goto out_free;
2902 }
2d981fdd
JB		 2903 }
2904
80616c0d
JB		 2905 next = skb;
2906 while (next) {
2907 skb = next;
2908 next = skb->next;
4c9451ed 2909
80616c0d
JB		 2910 skb->prev = NULL;
2911 skb->next = NULL;
2912
2913 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2914 if (IS_ERR(skb))
2915 goto out;
e2ebc74d 2916
5a490510 2917 ieee80211_tx_stats(dev, skb->len);
80616c0d
JB		 2918
2919 ieee80211_xmit(sdata, sta, skb);
2920 }
2d981fdd
JB		 2921 goto out;
2922 out_free:
2923 kfree_skb(skb);
4c9451ed 2924 out:
55de908a 2925 rcu_read_unlock();
e2ebc74d
JB		 2926}
2927
4c9451ed
JB		 2928/**
2929 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2930 * @skb: packet to be sent
2931 * @dev: incoming interface
2932 *
2933 * On failure skb will be freed.
2934 */
24d342c5
LK		 2935netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2936 struct net_device *dev)
2937{
2938 __ieee80211_subif_start_xmit(skb, dev, 0);
2939 return NETDEV_TX_OK;
2940}
e2ebc74d 2941
7528ec57
JB		 2942struct sk_buff *
2943ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2944 struct sk_buff *skb, u32 info_flags)
2945{
2946 struct ieee80211_hdr *hdr;
2947 struct ieee80211_tx_data tx = {
2948 .local = sdata->local,
2949 .sdata = sdata,
2950 };
97ffe757 2951 struct sta_info *sta;
7528ec57
JB		 2952
2953 rcu_read_lock();
2954
97ffe757
JB		 2955 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
2956 kfree_skb(skb);
2957 skb = ERR_PTR(-EINVAL);
2958 goto out;
2959 }
2960
2961 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
7528ec57
JB		 2962 if (IS_ERR(skb))
2963 goto out;
2964
2965 hdr = (void *)skb->data;
2966 tx.sta = sta_info_get(sdata, hdr->addr1);
2967 tx.skb = skb;
2968
2969 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2970 rcu_read_unlock();
2971 kfree_skb(skb);
2972 return ERR_PTR(-EINVAL);
2973 }
2974
2975out:
2976 rcu_read_unlock();
2977 return skb;
2978}
2979
e2530083
JB		 2980/*
2981 * ieee80211_clear_tx_pending may not be called in a context where
2982 * it is possible that it packets could come in again.
2983 */
e2ebc74d
JB		 2984void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2985{
1f98ab7f 2986 struct sk_buff *skb;
2de8e0d9 2987 int i;
e2ebc74d 2988
1f98ab7f
FF		 2989 for (i = 0; i < local->hw.queues; i++) {
2990 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2991 ieee80211_free_txskb(&local->hw, skb);
2992 }
e2ebc74d
JB		 2993}
2994
7bb45683
JB		 2995/*
2996 * Returns false if the frame couldn't be transmitted but was queued instead,
2997 * which in this case means re-queued -- take as an indication to stop sending
2998 * more pending frames.
2999 */
cd8ffc80
JB		 3000static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3001 struct sk_buff *skb)
3002{
3003 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3004 struct ieee80211_sub_if_data *sdata;
3005 struct sta_info *sta;
3006 struct ieee80211_hdr *hdr;
7bb45683 3007 bool result;
55de908a 3008 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 3009
5061b0c2 3010 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 3011
3012 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 3013 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3014 if (unlikely(!chanctx_conf)) {
3015 dev_kfree_skb(skb);
3016 return true;
3017 }
73c4e195 3018 info->band = chanctx_conf->def.chan->band;
7c10770f 3019 result = ieee80211_tx(sdata, NULL, skb, true);
cd8ffc80 3020 } else {
252b86c4
JB		 3021 struct sk_buff_head skbs;
3022
3023 __skb_queue_head_init(&skbs);
3024 __skb_queue_tail(&skbs, skb);
3025
cd8ffc80 3026 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 3027 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 3028
74e4dbfd 3029 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 3030 }
3031
cd8ffc80
JB		 3032 return result;
3033}
3034
e2530083 3035/*
3b8d81e0 3036 * Transmit all pending packets. Called from tasklet.
e2530083 3037 */
e2ebc74d
JB		 3038void ieee80211_tx_pending(unsigned long data)
3039{
3040 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 3041 unsigned long flags;
cd8ffc80 3042 int i;
3b8d81e0 3043 bool txok;
e2ebc74d 3044
f0e72851 3045 rcu_read_lock();
e2530083 3046
3b8d81e0 3047 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 3048 for (i = 0; i < local->hw.queues; i++) {
3049 /*
3050 * If queue is stopped by something other than due to pending
3051 * frames, or we have no pending frames, proceed to next queue.
3052 */
3b8d81e0 3053 if (local->queue_stop_reasons[i] ||
2a577d98 3054 skb_queue_empty(&local->pending[i]))
e2ebc74d 3055 continue;
e2530083 3056
2a577d98 3057 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 3058 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 3059 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 3060
a7bc376c 3061 if (WARN_ON(!info->control.vif)) {
c3e7724b 3062 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 3063 continue;
3064 }
3065
3b8d81e0
JB		 3066 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3067 flags);
3068
3069 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 3070 spin_lock_irqsave(&local->queue_stop_reason_lock,
3071 flags);
3072 if (!txok)
2a577d98 3073 break;
e2ebc74d 3074 }
7236fe29
JB		 3075
3076 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 3077 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 3078 }
3b8d81e0 3079 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 3080
f0e72851 3081 rcu_read_unlock();
e2ebc74d
JB		 3082}
3083
3084/* functions for drivers to get certain frames */
3085
eac70c13 3086static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3087 struct ps_data *ps, struct sk_buff *skb,
3088 bool is_template)
e2ebc74d
JB		 3089{
3090 u8 *pos, *tim;
3091 int aid0 = 0;
3092 int i, have_bits = 0, n1, n2;
3093
3094 /* Generate bitmap for TIM only if there are any STAs in power save
3095 * mode. */
d012a605 3096 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 3097 /* in the hope that this is faster than
3098 * checking byte-for-byte */
f359d3fe 3099 have_bits = !bitmap_empty((unsigned long *)ps->tim,
e2ebc74d 3100 IEEE80211_MAX_AID+1);
6ec8c332
AO		 3101 if (!is_template) {
3102 if (ps->dtim_count == 0)
3103 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3104 else
3105 ps->dtim_count--;
3106 }
e2ebc74d
JB		 3107
3108 tim = pos = (u8 *) skb_put(skb, 6);
3109 *pos++ = WLAN_EID_TIM;
3110 *pos++ = 4;
d012a605 3111 *pos++ = ps->dtim_count;
8860020e 3112 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 3113
d012a605 3114 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 3115 aid0 = 1;
3116
d012a605 3117 ps->dtim_bc_mc = aid0 == 1;
512119b3 3118
e2ebc74d
JB		 3119 if (have_bits) {
3120 /* Find largest even number N1 so that bits numbered 1 through
3121 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3122 * (N2 + 1) x 8 through 2007 are 0. */
3123 n1 = 0;
3124 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 3125 if (ps->tim[i]) {
e2ebc74d
JB		 3126 n1 = i & 0xfe;
3127 break;
3128 }
3129 }
3130 n2 = n1;
3131 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 3132 if (ps->tim[i]) {
e2ebc74d
JB		 3133 n2 = i;
3134 break;
3135 }
3136 }
3137
3138 /* Bitmap control */
3139 *pos++ = n1 | aid0;
3140 /* Part Virt Bitmap */
5220da39 3141 skb_put(skb, n2 - n1);
d012a605 3142 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 3143
3144 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 3145 } else {
3146 *pos++ = aid0; /* Bitmap control */
3147 *pos++ = 0; /* Part Virt Bitmap */
3148 }
e2ebc74d
JB		 3149}
3150
eac70c13 3151static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3152 struct ps_data *ps, struct sk_buff *skb,
3153 bool is_template)
eac70c13
MP		 3154{
3155 struct ieee80211_local *local = sdata->local;
3156
3157 /*
3158 * Not very nice, but we want to allow the driver to call
3159 * ieee80211_beacon_get() as a response to the set_tim()
3160 * callback. That, however, is already invoked under the
3161 * sta_lock to guarantee consistent and race-free update
3162 * of the tim bitmap in mac80211 and the driver.
3163 */
3164 if (local->tim_in_locked_section) {
6ec8c332 3165 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
eac70c13 3166 } else {
1b91731d 3167 spin_lock_bh(&local->tim_lock);
6ec8c332 3168 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
1b91731d 3169 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 3170 }
3171
3172 return 0;
3173}
3174
1af586c9
AO		 3175static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3176 struct beacon_data *beacon)
73da7d5b
SW		 3177{
3178 struct probe_resp *resp;
cd7760e6
SW		 3179 u8 *beacon_data;
3180 size_t beacon_data_len;
0d06d9ba 3181 int i;
af296bdb 3182 u8 count = beacon->csa_current_counter;
cd7760e6
SW		 3183
3184 switch (sdata->vif.type) {
3185 case NL80211_IFTYPE_AP:
3186 beacon_data = beacon->tail;
3187 beacon_data_len = beacon->tail_len;
3188 break;
3189 case NL80211_IFTYPE_ADHOC:
3190 beacon_data = beacon->head;
3191 beacon_data_len = beacon->head_len;
3192 break;
b8456a14
CYY		 3193 case NL80211_IFTYPE_MESH_POINT:
3194 beacon_data = beacon->head;
3195 beacon_data_len = beacon->head_len;
3196 break;
cd7760e6
SW		 3197 default:
3198 return;
3199 }
73da7d5b 3200
af296bdb 3201 rcu_read_lock();
0d06d9ba 3202 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
af296bdb 3203 resp = rcu_dereference(sdata->u.ap.probe_resp);
0d06d9ba 3204
af296bdb
MK		 3205 if (beacon->csa_counter_offsets[i]) {
3206 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3207 beacon_data_len)) {
0d06d9ba
AO		 3208 rcu_read_unlock();
3209 return;
3210 }
af296bdb
MK		 3211
3212 beacon_data[beacon->csa_counter_offsets[i]] = count;
73da7d5b 3213 }
af296bdb
MK		 3214
3215 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3216 resp->data[resp->csa_counter_offsets[i]] = count;
73da7d5b 3217 }
af296bdb 3218 rcu_read_unlock();
1af586c9
AO		 3219}
3220
e996ec2a
WD		 3221static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3222{
3223 beacon->csa_current_counter--;
3224
3225 /* the counter should never reach 0 */
3226 WARN_ON_ONCE(!beacon->csa_current_counter);
3227
3228 return beacon->csa_current_counter;
3229}
3230
1af586c9
AO		 3231u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3232{
3233 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
af296bdb
MK		 3234 struct beacon_data *beacon = NULL;
3235 u8 count = 0;
0d06d9ba 3236
af296bdb
MK		 3237 rcu_read_lock();
3238
3239 if (sdata->vif.type == NL80211_IFTYPE_AP)
3240 beacon = rcu_dereference(sdata->u.ap.beacon);
3241 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3242 beacon = rcu_dereference(sdata->u.ibss.presp);
3243 else if (ieee80211_vif_is_mesh(&sdata->vif))
3244 beacon = rcu_dereference(sdata->u.mesh.beacon);
3245
3246 if (!beacon)
3247 goto unlock;
3248
e996ec2a 3249 count = __ieee80211_csa_update_counter(beacon);
1af586c9 3250
af296bdb
MK		 3251unlock:
3252 rcu_read_unlock();
3253 return count;
73da7d5b 3254}
1af586c9 3255EXPORT_SYMBOL(ieee80211_csa_update_counter);
73da7d5b
SW		 3256
3257bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3258{
3259 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3260 struct beacon_data *beacon = NULL;
3261 u8 *beacon_data;
3262 size_t beacon_data_len;
73da7d5b
SW		 3263 int ret = false;
3264
3265 if (!ieee80211_sdata_running(sdata))
3266 return false;
3267
3268 rcu_read_lock();
3269 if (vif->type == NL80211_IFTYPE_AP) {
3270 struct ieee80211_if_ap *ap = &sdata->u.ap;
3271
3272 beacon = rcu_dereference(ap->beacon);
3273 if (WARN_ON(!beacon || !beacon->tail))
3274 goto out;
3275 beacon_data = beacon->tail;
3276 beacon_data_len = beacon->tail_len;
cd7760e6
SW		 3277 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3278 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3279
3280 beacon = rcu_dereference(ifibss->presp);
3281 if (!beacon)
3282 goto out;
3283
b8456a14
CYY		 3284 beacon_data = beacon->head;
3285 beacon_data_len = beacon->head_len;
3286 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3287 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3288
3289 beacon = rcu_dereference(ifmsh->beacon);
3290 if (!beacon)
3291 goto out;
3292
cd7760e6
SW		 3293 beacon_data = beacon->head;
3294 beacon_data_len = beacon->head_len;
73da7d5b
SW		 3295 } else {
3296 WARN_ON(1);
3297 goto out;
3298 }
3299
10d78f27
MK		 3300 if (!beacon->csa_counter_offsets[0])
3301 goto out;
3302
af296bdb 3303 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
73da7d5b
SW		 3304 goto out;
3305
af296bdb 3306 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
73da7d5b
SW		 3307 ret = true;
3308 out:
3309 rcu_read_unlock();
3310
3311 return ret;
3312}
3313EXPORT_SYMBOL(ieee80211_csa_is_complete);
3314
6ec8c332
AO		 3315static struct sk_buff *
3316__ieee80211_beacon_get(struct ieee80211_hw *hw,
3317 struct ieee80211_vif *vif,
3318 struct ieee80211_mutable_offsets *offs,
3319 bool is_template)
e2ebc74d
JB		 3320{
3321 struct ieee80211_local *local = hw_to_local(hw);
af296bdb 3322 struct beacon_data *beacon = NULL;
9d139c81 3323 struct sk_buff *skb = NULL;
e039fa4a 3324 struct ieee80211_tx_info *info;
e2ebc74d 3325 struct ieee80211_sub_if_data *sdata = NULL;
55de908a 3326 enum ieee80211_band band;
e00cfce0 3327 struct ieee80211_tx_rate_control txrc;
55de908a 3328 struct ieee80211_chanctx_conf *chanctx_conf;
1af586c9 3329 int csa_off_base = 0;
8318d78a 3330
5dfdaf58 3331 rcu_read_lock();
e2ebc74d 3332
32bfd35d 3333 sdata = vif_to_sdata(vif);
55de908a 3334 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 3335
55de908a 3336 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 3337 goto out;
3338
6ec8c332
AO		 3339 if (offs)
3340 memset(offs, 0, sizeof(*offs));
eddcbb94 3341
05c914fe 3342 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605 3343 struct ieee80211_if_ap *ap = &sdata->u.ap;
d012a605 3344
af296bdb 3345 beacon = rcu_dereference(ap->beacon);
3ad97fbc 3346 if (beacon) {
10d78f27 3347 if (beacon->csa_counter_offsets[0]) {
1af586c9 3348 if (!is_template)
e996ec2a 3349 __ieee80211_csa_update_counter(beacon);
1af586c9
AO		 3350
3351 ieee80211_set_csa(sdata, beacon);
3352 }
73da7d5b 3353
902acc78
JB		 3354 /*
3355 * headroom, head length,
3356 * tail length and maximum TIM length
3357 */
3358 skb = dev_alloc_skb(local->tx_headroom +
3359 beacon->head_len +
70dabeb7
FF		 3360 beacon->tail_len + 256 +
3361 local->hw.extra_beacon_tailroom);
902acc78
JB		 3362 if (!skb)
3363 goto out;
33b64eb2 3364
902acc78
JB		 3365 skb_reserve(skb, local->tx_headroom);
3366 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3367 beacon->head_len);
33b64eb2 3368
6ec8c332
AO		 3369 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3370 is_template);
33b64eb2 3371
6ec8c332
AO		 3372 if (offs) {
3373 offs->tim_offset = beacon->head_len;
3374 offs->tim_length = skb->len - beacon->head_len;
1af586c9
AO		 3375
3376 /* for AP the csa offsets are from tail */
3377 csa_off_base = skb->len;
6ec8c332 3378 }
eddcbb94 3379
902acc78
JB		 3380 if (beacon->tail)
3381 memcpy(skb_put(skb, beacon->tail_len),
3382 beacon->tail, beacon->tail_len);
9d139c81
JB		 3383 } else
3384 goto out;
05c914fe 3385 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 3386 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 3387 struct ieee80211_hdr *hdr;
33b64eb2 3388
af296bdb
MK		 3389 beacon = rcu_dereference(ifibss->presp);
3390 if (!beacon)
9d139c81
JB		 3391 goto out;
3392
10d78f27 3393 if (beacon->csa_counter_offsets[0]) {
1af586c9 3394 if (!is_template)
e996ec2a 3395 __ieee80211_csa_update_counter(beacon);
cd7760e6 3396
af296bdb 3397 ieee80211_set_csa(sdata, beacon);
1af586c9 3398 }
cd7760e6 3399
af296bdb 3400 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
70dabeb7 3401 local->hw.extra_beacon_tailroom);
9d139c81
JB		 3402 if (!skb)
3403 goto out;
c3ffeab4 3404 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3405 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3406 beacon->head_len);
9d139c81
JB		 3407
3408 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 3409 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3410 IEEE80211_STYPE_BEACON);
902acc78 3411 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 3412 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
472dbc45 3413
af296bdb
MK		 3414 beacon = rcu_dereference(ifmsh->beacon);
3415 if (!beacon)
ac1bd846 3416 goto out;
ac1bd846 3417
10d78f27 3418 if (beacon->csa_counter_offsets[0]) {
1af586c9
AO		 3419 if (!is_template)
3420 /* TODO: For mesh csa_counter is in TU, so
3421 * decrementing it by one isn't correct, but
3422 * for now we leave it consistent with overall
3423 * mac80211's behavior.
3424 */
e996ec2a 3425 __ieee80211_csa_update_counter(beacon);
1af586c9 3426
af296bdb 3427 ieee80211_set_csa(sdata, beacon);
1af586c9 3428 }
b8456a14 3429
dbf498fb 3430 if (ifmsh->sync_ops)
af296bdb 3431 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
dbf498fb 3432
3b69a9c5 3433 skb = dev_alloc_skb(local->tx_headroom +
af296bdb 3434 beacon->head_len +
3f52b7e3 3435 256 + /* TIM IE */
af296bdb 3436 beacon->tail_len +
70dabeb7 3437 local->hw.extra_beacon_tailroom);
902acc78
JB		 3438 if (!skb)
3439 goto out;
2b5e1967 3440 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3441 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3442 beacon->head_len);
6ec8c332
AO		 3443 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3444
3445 if (offs) {
af296bdb
MK		 3446 offs->tim_offset = beacon->head_len;
3447 offs->tim_length = skb->len - beacon->head_len;
6ec8c332
AO		 3448 }
3449
af296bdb
MK		 3450 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3451 beacon->tail_len);
9d139c81
JB		 3452 } else {
3453 WARN_ON(1);
5dfdaf58 3454 goto out;
e2ebc74d
JB		 3455 }
3456
1af586c9 3457 /* CSA offsets */
af296bdb 3458 if (offs && beacon) {
1af586c9
AO		 3459 int i;
3460
3461 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
af296bdb 3462 u16 csa_off = beacon->csa_counter_offsets[i];
1af586c9
AO		 3463
3464 if (!csa_off)
3465 continue;
3466
3467 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3468 }
3469 }
3470
4bf88530 3471 band = chanctx_conf->def.chan->band;
55de908a 3472
e039fa4a
JB		 3473 info = IEEE80211_SKB_CB(skb);
3474
3b8d81e0 3475 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 3476 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 3477 info->band = band;
e00cfce0
JM		 3478
3479 memset(&txrc, 0, sizeof(txrc));
3480 txrc.hw = hw;
e31583cd 3481 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 3482 txrc.bss_conf = &sdata->vif.bss_conf;
3483 txrc.skb = skb;
3484 txrc.reported_rate.idx = -1;
37eb0b16 3485 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 3486 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 3487 txrc.max_rate_idx = -1;
3488 else
3489 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 3490 txrc.bss = true;
e00cfce0 3491 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 3492
3493 info->control.vif = vif;
f591fa5d 3494
a472e71b
JL		 3495 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3496 IEEE80211_TX_CTL_ASSIGN_SEQ |
3497 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 3498 out:
5dfdaf58 3499 rcu_read_unlock();
e2ebc74d 3500 return skb;
6ec8c332
AO		 3501
3502}
3503
3504struct sk_buff *
3505ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3506 struct ieee80211_vif *vif,
3507 struct ieee80211_mutable_offsets *offs)
3508{
3509 return __ieee80211_beacon_get(hw, vif, offs, true);
3510}
3511EXPORT_SYMBOL(ieee80211_beacon_get_template);
3512
3513struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3514 struct ieee80211_vif *vif,
3515 u16 *tim_offset, u16 *tim_length)
3516{
3517 struct ieee80211_mutable_offsets offs = {};
3518 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
35afa588
HS		 3519 struct sk_buff *copy;
3520 struct ieee80211_supported_band *sband;
3521 int shift;
3522
3523 if (!bcn)
3524 return bcn;
6ec8c332
AO		 3525
3526 if (tim_offset)
3527 *tim_offset = offs.tim_offset;
3528
3529 if (tim_length)
3530 *tim_length = offs.tim_length;
3531
35afa588
HS		 3532 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
3533 !hw_to_local(hw)->monitors)
3534 return bcn;
3535
3536 /* send a copy to monitor interfaces */
3537 copy = skb_copy(bcn, GFP_ATOMIC);
3538 if (!copy)
3539 return bcn;
3540
3541 shift = ieee80211_vif_get_shift(vif);
3542 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
3543 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
3544
6ec8c332 3545 return bcn;
e2ebc74d 3546}
eddcbb94 3547EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 3548
02945821
AN		 3549struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3550 struct ieee80211_vif *vif)
3551{
3552 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 3553 struct sk_buff *skb = NULL;
3554 struct probe_resp *presp = NULL;
02945821
AN		 3555 struct ieee80211_hdr *hdr;
3556 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3557
3558 if (sdata->vif.type != NL80211_IFTYPE_AP)
3559 return NULL;
3560
3561 rcu_read_lock();
3562
3563 ap = &sdata->u.ap;
3564 presp = rcu_dereference(ap->probe_resp);
3565 if (!presp)
3566 goto out;
3567
aa7a0080 3568 skb = dev_alloc_skb(presp->len);
02945821
AN		 3569 if (!skb)
3570 goto out;
3571
aa7a0080
ES		 3572 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3573
02945821
AN		 3574 hdr = (struct ieee80211_hdr *) skb->data;
3575 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3576
3577out:
3578 rcu_read_unlock();
3579 return skb;
3580}
3581EXPORT_SYMBOL(ieee80211_proberesp_get);
3582
7044cc56
KV		 3583struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3584 struct ieee80211_vif *vif)
3585{
3586 struct ieee80211_sub_if_data *sdata;
3587 struct ieee80211_if_managed *ifmgd;
3588 struct ieee80211_pspoll *pspoll;
3589 struct ieee80211_local *local;
3590 struct sk_buff *skb;
3591
3592 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3593 return NULL;
3594
3595 sdata = vif_to_sdata(vif);
3596 ifmgd = &sdata->u.mgd;
3597 local = sdata->local;
3598
3599 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 3600 if (!skb)
7044cc56 3601 return NULL;
d15b8459 3602
7044cc56
KV		 3603 skb_reserve(skb, local->hw.extra_tx_headroom);
3604
3605 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3606 memset(pspoll, 0, sizeof(*pspoll));
3607 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3608 IEEE80211_STYPE_PSPOLL);
3609 pspoll->aid = cpu_to_le16(ifmgd->aid);
3610
3611 /* aid in PS-Poll has its two MSBs each set to 1 */
3612 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3613
3614 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3615 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3616
3617 return skb;
3618}
3619EXPORT_SYMBOL(ieee80211_pspoll_get);
3620
3621struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3622 struct ieee80211_vif *vif)
3623{
3624 struct ieee80211_hdr_3addr *nullfunc;
3625 struct ieee80211_sub_if_data *sdata;
3626 struct ieee80211_if_managed *ifmgd;
3627 struct ieee80211_local *local;
3628 struct sk_buff *skb;
3629
3630 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3631 return NULL;
3632
3633 sdata = vif_to_sdata(vif);
3634 ifmgd = &sdata->u.mgd;
3635 local = sdata->local;
3636
3637 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 3638 if (!skb)
7044cc56 3639 return NULL;
d15b8459 3640
7044cc56
KV		 3641 skb_reserve(skb, local->hw.extra_tx_headroom);
3642
3643 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3644 sizeof(*nullfunc));
3645 memset(nullfunc, 0, sizeof(*nullfunc));
3646 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3647 IEEE80211_STYPE_NULLFUNC |
3648 IEEE80211_FCTL_TODS);
3649 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3650 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3651 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3652
3653 return skb;
3654}
3655EXPORT_SYMBOL(ieee80211_nullfunc_get);
3656
05e54ea6 3657struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
a344d677 3658 const u8 *src_addr,
05e54ea6 3659 const u8 *ssid, size_t ssid_len,
b9a9ada1 3660 size_t tailroom)
05e54ea6 3661{
a344d677 3662 struct ieee80211_local *local = hw_to_local(hw);
05e54ea6
KV		 3663 struct ieee80211_hdr_3addr *hdr;
3664 struct sk_buff *skb;
3665 size_t ie_ssid_len;
3666 u8 *pos;
3667
05e54ea6
KV		 3668 ie_ssid_len = 2 + ssid_len;
3669
3670 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 3671 ie_ssid_len + tailroom);
d15b8459 3672 if (!skb)
05e54ea6 3673 return NULL;
05e54ea6
KV		 3674
3675 skb_reserve(skb, local->hw.extra_tx_headroom);
3676
3677 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3678 memset(hdr, 0, sizeof(*hdr));
3679 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3680 IEEE80211_STYPE_PROBE_REQ);
e83e6541 3681 eth_broadcast_addr(hdr->addr1);
a344d677 3682 memcpy(hdr->addr2, src_addr, ETH_ALEN);
e83e6541 3683 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 3684
3685 pos = skb_put(skb, ie_ssid_len);
3686 *pos++ = WLAN_EID_SSID;
3687 *pos++ = ssid_len;
88c868c4 3688 if (ssid_len)
05e54ea6
KV		 3689 memcpy(pos, ssid, ssid_len);
3690 pos += ssid_len;
3691
05e54ea6
KV		 3692 return skb;
3693}
3694EXPORT_SYMBOL(ieee80211_probereq_get);
3695
32bfd35d 3696void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3697 const void *frame, size_t frame_len,
e039fa4a 3698 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3699 struct ieee80211_rts *rts)
3700{
3701 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3702
065e9605
HH		 3703 rts->frame_control =
3704 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 3705 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3706 frame_txctl);
e2ebc74d
JB		 3707 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3708 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3709}
3710EXPORT_SYMBOL(ieee80211_rts_get);
3711
32bfd35d 3712void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3713 const void *frame, size_t frame_len,
e039fa4a 3714 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3715 struct ieee80211_cts *cts)
3716{
3717 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3718
065e9605
HH		 3719 cts->frame_control =
3720 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 3721 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3722 frame_len, frame_txctl);
e2ebc74d
JB		 3723 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3724}
3725EXPORT_SYMBOL(ieee80211_ctstoself_get);
3726
3727struct sk_buff *
32bfd35d 3728ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 3729 struct ieee80211_vif *vif)
e2ebc74d
JB		 3730{
3731 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 3732 struct sk_buff *skb = NULL;
5cf121c3 3733 struct ieee80211_tx_data tx;
e2ebc74d 3734 struct ieee80211_sub_if_data *sdata;
d012a605 3735 struct ps_data *ps;
e039fa4a 3736 struct ieee80211_tx_info *info;
55de908a 3737 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 3738
32bfd35d 3739 sdata = vif_to_sdata(vif);
5dfdaf58 3740
5dfdaf58 3741 rcu_read_lock();
55de908a 3742 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 3743
d012a605
MP		 3744 if (!chanctx_conf)
3745 goto out;
3746
3747 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3748 struct beacon_data *beacon =
3749 rcu_dereference(sdata->u.ap.beacon);
3750
3751 if (!beacon || !beacon->head)
3752 goto out;
3753
3754 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 3755 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3756 ps = &sdata->u.mesh.ps;
d012a605 3757 } else {
747cf5e9 3758 goto out;
d012a605 3759 }
5dfdaf58 3760
d012a605 3761 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 3762 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 3763
e2ebc74d 3764 while (1) {
d012a605 3765 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 3766 if (!skb)
747cf5e9 3767 goto out;
e2ebc74d
JB		 3768 local->total_ps_buffered--;
3769
d012a605 3770 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 3771 struct ieee80211_hdr *hdr =
3772 (struct ieee80211_hdr *) skb->data;
3773 /* more buffered multicast/broadcast frames ==> set
3774 * MoreData flag in IEEE 802.11 header to inform PS
3775 * STAs */
3776 hdr->frame_control |=
3777 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3778 }
3779
112c44b2 3780 if (sdata->vif.type == NL80211_IFTYPE_AP)
7cbf9d01 3781 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
7c10770f 3782 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
e2ebc74d
JB		 3783 break;
3784 dev_kfree_skb_any(skb);
3785 }
e039fa4a
JB		 3786
3787 info = IEEE80211_SKB_CB(skb);
3788
5cf121c3 3789 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 3790 info->band = chanctx_conf->def.chan->band;
e2ebc74d 3791
97b045d6 3792 if (invoke_tx_handlers(&tx))
e2ebc74d 3793 skb = NULL;
97b045d6 3794 out:
d0709a65 3795 rcu_read_unlock();
e2ebc74d
JB		 3796
3797 return skb;
3798}
3799EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 3800
b6da911b
LK		 3801int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3802{
3803 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3804 struct ieee80211_sub_if_data *sdata = sta->sdata;
3805 struct ieee80211_local *local = sdata->local;
3806 int ret;
3807 u32 queues;
3808
3809 lockdep_assert_held(&local->sta_mtx);
3810
3811 /* only some cases are supported right now */
3812 switch (sdata->vif.type) {
3813 case NL80211_IFTYPE_STATION:
3814 case NL80211_IFTYPE_AP:
3815 case NL80211_IFTYPE_AP_VLAN:
3816 break;
3817 default:
3818 WARN_ON(1);
3819 return -EINVAL;
3820 }
3821
3822 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3823 return -EINVAL;
3824
3825 if (sta->reserved_tid == tid) {
3826 ret = 0;
3827 goto out;
3828 }
3829
3830 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3831 sdata_err(sdata, "TID reservation already active\n");
3832 ret = -EALREADY;
3833 goto out;
3834 }
3835
3836 ieee80211_stop_vif_queues(sdata->local, sdata,
3837 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3838
3839 synchronize_net();
3840
3841 /* Tear down BA sessions so we stop aggregating on this TID */
30686bf7 3842 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
b6da911b
LK		 3843 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3844 __ieee80211_stop_tx_ba_session(sta, tid,
3845 AGG_STOP_LOCAL_REQUEST);
3846 }
3847
3848 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3b24f4c6 3849 __ieee80211_flush_queues(local, sdata, queues, false);
b6da911b
LK		 3850
3851 sta->reserved_tid = tid;
3852
3853 ieee80211_wake_vif_queues(local, sdata,
3854 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3855
30686bf7 3856 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
b6da911b
LK		 3857 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3858
3859 ret = 0;
3860 out:
3861 return ret;
3862}
3863EXPORT_SYMBOL(ieee80211_reserve_tid);
3864
3865void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3866{
3867 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3868 struct ieee80211_sub_if_data *sdata = sta->sdata;
3869
3870 lockdep_assert_held(&sdata->local->sta_mtx);
3871
3872 /* only some cases are supported right now */
3873 switch (sdata->vif.type) {
3874 case NL80211_IFTYPE_STATION:
3875 case NL80211_IFTYPE_AP:
3876 case NL80211_IFTYPE_AP_VLAN:
3877 break;
3878 default:
3879 WARN_ON(1);
3880 return;
3881 }
3882
3883 if (tid != sta->reserved_tid) {
3884 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3885 return;
3886 }
3887
3888 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3889}
3890EXPORT_SYMBOL(ieee80211_unreserve_tid);
3891
55de908a
JB		 3892void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3893 struct sk_buff *skb, int tid,
3894 enum ieee80211_band band)
3b8d81e0 3895{
353d09c6 3896 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 3897
3b8d81e0
JB		 3898 skb_set_mac_header(skb, 0);
3899 skb_set_network_header(skb, 0);
3900 skb_set_transport_header(skb, 0);
3901
3a25a8c8 3902 skb_set_queue_mapping(skb, ac);
cf6bb79a 3903 skb->priority = tid;
cf0277e7 3904
89afe614
JB		 3905 skb->dev = sdata->dev;
3906
3d34deb6
JB		 3907 /*
3908 * The other path calling ieee80211_xmit is from the tasklet,
3909 * and while we can handle concurrent transmissions locking
3910 * requirements are that we do not come into tx with bhs on.
3911 */
3912 local_bh_disable();
73c4e195 3913 IEEE80211_SKB_CB(skb)->band = band;
7c10770f 3914 ieee80211_xmit(sdata, NULL, skb);
3d34deb6 3915 local_bh_enable();
3b8d81e0 3916}
Linux 6.x block layer and io_uring tree(s)