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networking: introduce and use skb_put_data()
[linux-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>
ebceec86 19#include <linux/if_vlan.h>
e2ebc74d
JB		 20#include <linux/etherdevice.h>
21#include <linux/bitmap.h>
d4e46a3d 22#include <linux/rcupdate.h>
bc3b2d7f 23#include <linux/export.h>
881d966b 24#include <net/net_namespace.h>
e2ebc74d
JB		 25#include <net/ieee80211_radiotap.h>
26#include <net/cfg80211.h>
27#include <net/mac80211.h>
5caa328e
MK		 28#include <net/codel.h>
29#include <net/codel_impl.h>
e2ebc74d 30#include <asm/unaligned.h>
fa962b92 31#include <net/fq_impl.h>
e2ebc74d
JB		 32
33#include "ieee80211_i.h"
24487981 34#include "driver-ops.h"
2c8dccc7 35#include "led.h"
33b64eb2 36#include "mesh.h"
e2ebc74d
JB		 37#include "wep.h"
38#include "wpa.h"
39#include "wme.h"
2c8dccc7 40#include "rate.h"
e2ebc74d 41
e2ebc74d
JB		 42/* misc utils */
43
5a490510
JB		 44static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
45{
46 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
47
48 u64_stats_update_begin(&tstats->syncp);
49 tstats->tx_packets++;
50 tstats->tx_bytes += len;
51 u64_stats_update_end(&tstats->syncp);
52}
53
252b86c4
JB		 54static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
55 struct sk_buff *skb, int group_addr,
03f93c3d 56 int next_frag_len)
e2ebc74d 57{
2103dec1 58 int rate, mrate, erp, dur, i, shift = 0;
2e92e6f2 59 struct ieee80211_rate *txrate;
e2ebc74d 60 struct ieee80211_local *local = tx->local;
8318d78a 61 struct ieee80211_supported_band *sband;
358c8d9d 62 struct ieee80211_hdr *hdr;
252b86c4 63 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2103dec1
SW		 64 struct ieee80211_chanctx_conf *chanctx_conf;
65 u32 rate_flags = 0;
66
95cd470c
FF		 67 /* assume HW handles this */
68 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
69 return 0;
70
2103dec1
SW		 71 rcu_read_lock();
72 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
73 if (chanctx_conf) {
74 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
75 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
76 }
77 rcu_read_unlock();
e6a9854b 78
e6a9854b 79 /* uh huh? */
0d528d85 80 if (WARN_ON_ONCE(tx->rate.idx < 0))
e6a9854b 81 return 0;
e2ebc74d 82
2d56577b 83 sband = local->hw.wiphy->bands[info->band];
0d528d85 84 txrate = &sband->bitrates[tx->rate.idx];
8318d78a 85
e6a9854b 86 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 87
88 /*
89 * data and mgmt (except PS Poll):
90 * - during CFP: 32768
91 * - during contention period:
92 * if addr1 is group address: 0
93 * if more fragments = 0 and addr1 is individual address: time to
94 * transmit one ACK plus SIFS
95 * if more fragments = 1 and addr1 is individual address: time to
96 * transmit next fragment plus 2 x ACK plus 3 x SIFS
97 *
98 * IEEE 802.11, 9.6:
99 * - control response frame (CTS or ACK) shall be transmitted using the
100 * same rate as the immediately previous frame in the frame exchange
101 * sequence, if this rate belongs to the PHY mandatory rates, or else
102 * at the highest possible rate belonging to the PHY rates in the
103 * BSSBasicRateSet
104 */
252b86c4 105 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 106 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 107 /* TODO: These control frames are not currently sent by
ccd7b362 108 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 109 * needs to be updated to support duration field calculation.
110 *
111 * RTS: time needed to transmit pending data/mgmt frame plus
112 * one CTS frame plus one ACK frame plus 3 x SIFS
113 * CTS: duration of immediately previous RTS minus time
114 * required to transmit CTS and its SIFS
115 * ACK: 0 if immediately previous directed data/mgmt had
116 * more=0, with more=1 duration in ACK frame is duration
117 * from previous frame minus time needed to transmit ACK
118 * and its SIFS
119 * PS Poll: BIT(15) | BIT(14) | aid
120 */
121 return 0;
122 }
123
124 /* data/mgmt */
125 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 126 return cpu_to_le16(32768);
e2ebc74d
JB		 127
128 if (group_addr) /* Group address as the destination - no ACK */
129 return 0;
130
131 /* Individual destination address:
132 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
133 * CTS and ACK frames shall be transmitted using the highest rate in
134 * basic rate set that is less than or equal to the rate of the
135 * immediately previous frame and that is using the same modulation
136 * (CCK or OFDM). If no basic rate set matches with these requirements,
137 * the highest mandatory rate of the PHY that is less than or equal to
138 * the rate of the previous frame is used.
139 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
140 */
141 rate = -1;
8318d78a
JB		 142 /* use lowest available if everything fails */
143 mrate = sband->bitrates[0].bitrate;
144 for (i = 0; i < sband->n_bitrates; i++) {
145 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 146
8318d78a
JB		 147 if (r->bitrate > txrate->bitrate)
148 break;
e2ebc74d 149
2103dec1
SW		 150 if ((rate_flags & r->flags) != rate_flags)
151 continue;
152
bda3933a 153 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
2103dec1 154 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
8318d78a
JB		 155
156 switch (sband->band) {
57fbcce3 157 case NL80211_BAND_2GHZ: {
8318d78a
JB		 158 u32 flag;
159 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
160 flag = IEEE80211_RATE_MANDATORY_G;
161 else
162 flag = IEEE80211_RATE_MANDATORY_B;
163 if (r->flags & flag)
164 mrate = r->bitrate;
165 break;
166 }
57fbcce3 167 case NL80211_BAND_5GHZ:
8318d78a
JB		 168 if (r->flags & IEEE80211_RATE_MANDATORY_A)
169 mrate = r->bitrate;
170 break;
57fbcce3 171 case NL80211_BAND_60GHZ:
3a0c52a6 172 /* TODO, for now fall through */
57fbcce3 173 case NUM_NL80211_BANDS:
8318d78a
JB		 174 WARN_ON(1);
175 break;
176 }
e2ebc74d
JB		 177 }
178 if (rate == -1) {
179 /* No matching basic rate found; use highest suitable mandatory
180 * PHY rate */
2103dec1 181 rate = DIV_ROUND_UP(mrate, 1 << shift);
e2ebc74d
JB		 182 }
183
6674f210
SW		 184 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
185 if (ieee80211_is_data_qos(hdr->frame_control) &&
c26a0e10 186 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
6674f210
SW		 187 dur = 0;
188 else
189 /* Time needed to transmit ACK
190 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
191 * to closest integer */
4ee73f33 192 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
438b61b7
SW		 193 tx->sdata->vif.bss_conf.use_short_preamble,
194 shift);
e2ebc74d
JB		 195
196 if (next_frag_len) {
197 /* Frame is fragmented: duration increases with time needed to
198 * transmit next fragment plus ACK and 2 x SIFS. */
199 dur *= 2; /* ACK + SIFS */
200 /* next fragment */
4ee73f33 201 dur += ieee80211_frame_duration(sband->band, next_frag_len,
8318d78a 202 txrate->bitrate, erp,
438b61b7
SW		 203 tx->sdata->vif.bss_conf.use_short_preamble,
204 shift);
e2ebc74d
JB		 205 }
206
03f93c3d 207 return cpu_to_le16(dur);
e2ebc74d
JB		 208}
209
e2ebc74d 210/* tx handlers */
5c1b98a5
KV		 211static ieee80211_tx_result debug_noinline
212ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
213{
214 struct ieee80211_local *local = tx->local;
0c74211d 215 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 216
217 /* driver doesn't support power save */
30686bf7 218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
5c1b98a5
KV		 219 return TX_CONTINUE;
220
221 /* hardware does dynamic power save */
30686bf7 222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
5c1b98a5
KV		 223 return TX_CONTINUE;
224
225 /* dynamic power save disabled */
226 if (local->hw.conf.dynamic_ps_timeout <= 0)
227 return TX_CONTINUE;
228
229 /* we are scanning, don't enable power save */
230 if (local->scanning)
231 return TX_CONTINUE;
232
233 if (!local->ps_sdata)
234 return TX_CONTINUE;
235
236 /* No point if we're going to suspend */
237 if (local->quiescing)
238 return TX_CONTINUE;
239
0c74211d
KV		 240 /* dynamic ps is supported only in managed mode */
241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
242 return TX_CONTINUE;
243
244 ifmgd = &tx->sdata->u.mgd;
245
246 /*
247 * Don't wakeup from power save if u-apsd is enabled, voip ac has
248 * u-apsd enabled and the frame is in voip class. This effectively
249 * means that even if all access categories have u-apsd enabled, in
250 * practise u-apsd is only used with the voip ac. This is a
251 * workaround for the case when received voip class packets do not
252 * have correct qos tag for some reason, due the network or the
253 * peer application.
254 *
dc41e4d4 255 * Note: ifmgd->uapsd_queues access is racy here. If the value is
0c74211d
KV		 256 * changed via debugfs, user needs to reassociate manually to have
257 * everything in sync.
258 */
4875d30d
JB		 259 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
260 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
261 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
0c74211d
KV		 262 return TX_CONTINUE;
263
5c1b98a5
KV		 264 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
265 ieee80211_stop_queues_by_reason(&local->hw,
445ea4e8 266 IEEE80211_MAX_QUEUE_MAP,
cca07b00
LC		 267 IEEE80211_QUEUE_STOP_REASON_PS,
268 false);
db28569a 269 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 270 ieee80211_queue_work(&local->hw,
271 &local->dynamic_ps_disable_work);
272 }
273
5db1c07c
LC		 274 /* Don't restart the timer if we're not disassociated */
275 if (!ifmgd->associated)
276 return TX_CONTINUE;
277
5c1b98a5
KV		 278 mod_timer(&local->dynamic_ps_timer, jiffies +
279 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
280
281 return TX_CONTINUE;
282}
e2ebc74d 283
d9e8a70f 284static ieee80211_tx_result debug_noinline
5cf121c3 285ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 286{
358c8d9d 287
e039fa4a 288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 290 bool assoc = false;
e2ebc74d 291
e039fa4a 292 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 293 return TX_CONTINUE;
58d4185e 294
b23b025f
BG		 295 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
296 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 297 !ieee80211_is_probe_req(hdr->frame_control) &&
298 !ieee80211_is_nullfunc(hdr->frame_control))
299 /*
300 * When software scanning only nullfunc frames (to notify
301 * the sleep state to the AP) and probe requests (for the
302 * active scan) are allowed, all other frames should not be
303 * sent and we should not get here, but if we do
304 * nonetheless, drop them to avoid sending them
305 * off-channel. See the link below and
306 * ieee80211_start_scan() for more.
307 *
308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
309 */
9ae54c84 310 return TX_DROP;
e2ebc74d 311
239281f8
RL		 312 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
313 return TX_CONTINUE;
314
1be7fe8d
BJ		 315 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
316 return TX_CONTINUE;
317
5cf121c3 318 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 319 return TX_CONTINUE;
e2ebc74d 320
c2c98fde
JB		 321 if (tx->sta)
322 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 323
5cf121c3 324 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 325 if (unlikely(!assoc &&
358c8d9d 326 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d 327#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0
JB		 328 sdata_info(tx->sdata,
329 "dropped data frame to not associated station %pM\n",
330 hdr->addr1);
331#endif
e2ebc74d 332 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 333 return TX_DROP;
e2ebc74d 334 }
72f15d53
MB		 335 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
336 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
29623892
JB		 337 /*
338 * No associated STAs - no need to send multicast
339 * frames.
340 */
341 return TX_DROP;
e2ebc74d
JB		 342 }
343
9ae54c84 344 return TX_CONTINUE;
e2ebc74d
JB		 345}
346
e2ebc74d
JB		 347/* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351static void purge_old_ps_buffers(struct ieee80211_local *local)
352{
353 int total = 0, purged = 0;
354 struct sk_buff *skb;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
357
79010420 358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
d012a605
MP		 359 struct ps_data *ps;
360
361 if (sdata->vif.type == NL80211_IFTYPE_AP)
362 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 363 else if (ieee80211_vif_is_mesh(&sdata->vif))
364 ps = &sdata->u.mesh.ps;
d012a605 365 else
e2ebc74d 366 continue;
d012a605
MP		 367
368 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d
JB		 369 if (skb) {
370 purged++;
6b07d9ca 371 ieee80211_free_txskb(&local->hw, skb);
e2ebc74d 372 }
d012a605 373 total += skb_queue_len(&ps->bc_buf);
e2ebc74d 374 }
e2ebc74d 375
948d887d
JB		 376 /*
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
379 */
d0709a65 380 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 381 int ac;
382
383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
384 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
385 total += skb_queue_len(&sta->ps_tx_buf[ac]);
386 if (skb) {
387 purged++;
c3e7724b 388 ieee80211_free_txskb(&local->hw, skb);
948d887d
JB		 389 break;
390 }
e2ebc74d 391 }
e2ebc74d 392 }
d0709a65 393
e2ebc74d 394 local->total_ps_buffered = total;
bdcbd8e0 395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
e2ebc74d
JB		 396}
397
9ae54c84 398static ieee80211_tx_result
5cf121c3 399ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 400{
e039fa4a 401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d012a605 403 struct ps_data *ps;
e039fa4a 404
7d54d0dd
JB		 405 /*
406 * broadcast/multicast frame
407 *
3f52b7e3 408 * If any of the associated/peer stations is in power save mode,
7d54d0dd
JB		 409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
411 */
412
3f52b7e3 413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
d012a605
MP		 414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 if (!tx->sdata->bss)
417 return TX_CONTINUE;
418
419 ps = &tx->sdata->bss->ps;
3f52b7e3
MP		 420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 ps = &tx->sdata->u.mesh.ps;
d012a605 422 } else {
3e122be0 423 return TX_CONTINUE;
d012a605
MP		 424 }
425
3e122be0
JB		 426
427 /* no buffering for ordered frames */
358c8d9d 428 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 429 return TX_CONTINUE;
7d54d0dd 430
08b99399
JB		 431 if (ieee80211_is_probe_req(hdr->frame_control))
432 return TX_CONTINUE;
433
30686bf7 434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
f4d57941
JB		 435 info->hw_queue = tx->sdata->vif.cab_queue;
436
7d54d0dd 437 /* no stations in PS mode */
d012a605 438 if (!atomic_read(&ps->num_sta_ps))
9ae54c84 439 return TX_CONTINUE;
7d54d0dd 440
62b517cb 441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
62b1208e 442
62b517cb 443 /* device releases frame after DTIM beacon */
30686bf7 444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
62b1208e 445 return TX_CONTINUE;
62b1208e 446
7d54d0dd 447 /* buffered in mac80211 */
62b1208e
JB		 448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 purge_old_ps_buffers(tx->local);
450
d012a605 451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
bdcbd8e0
JB		 452 ps_dbg(tx->sdata,
453 "BC TX buffer full - dropping the oldest frame\n");
6b07d9ca 454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
62b1208e
JB		 455 } else
456 tx->local->total_ps_buffered++;
e2ebc74d 457
d012a605 458 skb_queue_tail(&ps->bc_buf, tx->skb);
7d54d0dd 459
62b1208e 460 return TX_QUEUED;
e2ebc74d
JB		 461}
462
fb733336
JM		 463static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
464 struct sk_buff *skb)
465{
466 if (!ieee80211_is_mgmt(fc))
467 return 0;
468
c2c98fde 469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 470 return 0;
471
d8ca16db 472 if (!ieee80211_is_robust_mgmt_frame(skb))
fb733336
JM		 473 return 0;
474
475 return 1;
476}
477
9ae54c84 478static ieee80211_tx_result
5cf121c3 479ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 480{
481 struct sta_info *sta = tx->sta;
e039fa4a 482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
08b99399 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 484 struct ieee80211_local *local = tx->local;
e2ebc74d 485
02f2f1a9 486 if (unlikely(!sta))
9ae54c84 487 return TX_CONTINUE;
e2ebc74d 488
c2c98fde 489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
5ac2e350
JB		 490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
02f2f1a9 492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
948d887d
JB		 493 int ac = skb_get_queue_mapping(tx->skb);
494
08b99399
JB		 495 if (ieee80211_is_mgmt(hdr->frame_control) &&
496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 return TX_CONTINUE;
499 }
500
bdcbd8e0
JB		 501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d
JB		 503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
504 purge_old_ps_buffers(tx->local);
1d147bfa
EG		 505
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta->ps_lock);
508 /*
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
512 */
513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
5ac2e350
JB		 514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
1d147bfa
EG		 516 spin_unlock(&sta->ps_lock);
517 return TX_CONTINUE;
518 }
519
948d887d
JB		 520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
bdcbd8e0
JB		 522 ps_dbg(tx->sdata,
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
524 sta->sta.addr, ac);
c3e7724b 525 ieee80211_free_txskb(&local->hw, old);
e2ebc74d
JB		 526 } else
527 tx->local->total_ps_buffered++;
004c872e 528
e039fa4a 529 info->control.jiffies = jiffies;
5061b0c2 530 info->control.vif = &tx->sdata->vif;
8f77f384 531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
03c8c06f 532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
948d887d 533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
1d147bfa 534 spin_unlock(&sta->ps_lock);
3393a608
JO		 535
536 if (!timer_pending(&local->sta_cleanup))
537 mod_timer(&local->sta_cleanup,
538 round_jiffies(jiffies +
539 STA_INFO_CLEANUP_INTERVAL));
540
c868cb35
JB		 541 /*
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
544 */
545 sta_info_recalc_tim(sta);
546
9ae54c84 547 return TX_QUEUED;
bdcbd8e0
JB		 548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
549 ps_dbg(tx->sdata,
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
551 sta->sta.addr);
e2ebc74d 552 }
e2ebc74d 553
9ae54c84 554 return TX_CONTINUE;
e2ebc74d
JB		 555}
556
d9e8a70f 557static ieee80211_tx_result debug_noinline
5cf121c3 558ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 559{
5cf121c3 560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 561 return TX_CONTINUE;
e2ebc74d 562
5cf121c3 563 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 564 return ieee80211_tx_h_unicast_ps_buf(tx);
565 else
566 return ieee80211_tx_h_multicast_ps_buf(tx);
567}
568
a621fa4d
JB		 569static ieee80211_tx_result debug_noinline
570ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
571{
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
573
af61a165
JB		 574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
575 if (tx->sdata->control_port_no_encrypt)
576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
9c1c98a3 578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
af61a165 579 }
a621fa4d
JB		 580
581 return TX_CONTINUE;
582}
583
d9e8a70f 584static ieee80211_tx_result debug_noinline
5cf121c3 585ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 586{
46e6de15 587 struct ieee80211_key *key;
e039fa4a 588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 590
3b8d81e0 591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 592 tx->key = NULL;
2475b1cc
MS		 593 else if (tx->sta &&
594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
d4e46a3d 595 tx->key = key;
46f6b060
MH		 596 else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 (key = rcu_dereference(tx->sdata->default_multicast_key)))
598 tx->key = key;
3cfcf6ac 599 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324 600 is_multicast_ether_addr(hdr->addr1) &&
d8ca16db 601 ieee80211_is_robust_mgmt_frame(tx->skb) &&
3cfcf6ac
JM		 602 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
603 tx->key = key;
f7e0104c
JB		 604 else if (is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
606 tx->key = key;
607 else if (!is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 609 tx->key = key;
e8f4fb7c 610 else
4922f71f 611 tx->key = NULL;
e2ebc74d
JB		 612
613 if (tx->key) {
813d7669
JB		 614 bool skip_hw = false;
615
011bfcc4 616 /* TODO: add threshold stuff again */
176e4f84 617
97359d12
JB		 618 switch (tx->key->conf.cipher) {
619 case WLAN_CIPHER_SUITE_WEP40:
620 case WLAN_CIPHER_SUITE_WEP104:
97359d12 621 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 622 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 623 tx->key = NULL;
624 break;
97359d12 625 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db 626 case WLAN_CIPHER_SUITE_CCMP_256:
00b9cfa3
JM		 627 case WLAN_CIPHER_SUITE_GCMP:
628 case WLAN_CIPHER_SUITE_GCMP_256:
fb733336
JM		 629 if (!ieee80211_is_data_present(hdr->frame_control) &&
630 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
46f6b060
MH		 631 tx->skb) &&
632 !ieee80211_is_group_privacy_action(tx->skb))
fb733336 633 tx->key = NULL;
3b43a187
KV		 634 else
635 skip_hw = (tx->key->conf.flags &
e548c49e 636 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 637 ieee80211_is_mgmt(hdr->frame_control);
fb733336 638 break;
97359d12 639 case WLAN_CIPHER_SUITE_AES_CMAC:
56c52da2 640 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
8ade538b
JM		 641 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3cfcf6ac
JM		 643 if (!ieee80211_is_mgmt(hdr->frame_control))
644 tx->key = NULL;
645 break;
176e4f84 646 }
813d7669 647
e54faf29
JB		 648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 !ieee80211_is_deauth(hdr->frame_control)))
95acac61
JB		 650 return TX_DROP;
651
f12553eb 652 if (!skip_hw && tx->key &&
382b1655 653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 654 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 655 }
656
9ae54c84 657 return TX_CONTINUE;
e2ebc74d
JB		 658}
659
d9e8a70f 660static ieee80211_tx_result debug_noinline
5cf121c3 661ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 662{
e039fa4a 663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 664 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
665 struct ieee80211_supported_band *sband;
a2c40249 666 u32 len;
e6a9854b 667 struct ieee80211_tx_rate_control txrc;
0d528d85 668 struct ieee80211_sta_rates *ratetbl = NULL;
c2c98fde 669 bool assoc = false;
8318d78a 670
e6a9854b 671 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 672
2d56577b 673 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 674
a2c40249 675 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 676 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 677
678 /* set up the tx rate control struct we give the RC algo */
005e472b 679 txrc.hw = &tx->local->hw;
e6a9854b
JB		 680 txrc.sband = sband;
681 txrc.bss_conf = &tx->sdata->vif.bss_conf;
682 txrc.skb = tx->skb;
683 txrc.reported_rate.idx = -1;
2d56577b 684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
2ffbe6d3
FF		 685
686 if (tx->sdata->rc_has_mcs_mask[info->band])
687 txrc.rate_idx_mcs_mask =
688 tx->sdata->rc_rateidx_mcs_mask[info->band];
689
8f0729b1 690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
5765f9f6
BVB		 692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
693 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
e6a9854b
JB		 694
695 /* set up RTS protection if desired */
b9a5f8ca 696 if (len > tx->local->hw.wiphy->rts_threshold) {
0d528d85 697 txrc.rts = true;
e2ebc74d 698 }
e2ebc74d 699
0d528d85 700 info->control.use_rts = txrc.rts;
991fec09
FF		 701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
702
e6a9854b
JB		 703 /*
704 * Use short preamble if the BSS can handle it, but not for
705 * management frames unless we know the receiver can handle
706 * that -- the management frame might be to a station that
707 * just wants a probe response.
708 */
709 if (tx->sdata->vif.bss_conf.use_short_preamble &&
710 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
0d528d85
FF		 712 txrc.short_preamble = true;
713
714 info->control.short_preamble = txrc.short_preamble;
e2ebc74d 715
dfdfc2be
SE		 716 /* don't ask rate control when rate already injected via radiotap */
717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
718 return TX_CONTINUE;
719
c2c98fde
JB		 720 if (tx->sta)
721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 722
723 /*
724 * Lets not bother rate control if we're associated and cannot
725 * talk to the sta. This should not happen.
726 */
c2c98fde 727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 728 !rate_usable_index_exists(sband, &tx->sta->sta),
729 "%s: Dropped data frame as no usable bitrate found while "
730 "scanning and associated. Target station: "
731 "%pM on %d GHz band\n",
47846c9b 732 tx->sdata->name, hdr->addr1,
2d56577b 733 info->band ? 5 : 2))
b770b43e 734 return TX_DROP;
2e92e6f2 735
b770b43e
LR		 736 /*
737 * If we're associated with the sta at this point we know we can at
738 * least send the frame at the lowest bit rate.
739 */
e6a9854b
JB		 740 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
741
0d528d85
FF		 742 if (tx->sta && !info->control.skip_table)
743 ratetbl = rcu_dereference(tx->sta->sta.rates);
744
745 if (unlikely(info->control.rates[0].idx < 0)) {
746 if (ratetbl) {
747 struct ieee80211_tx_rate rate = {
748 .idx = ratetbl->rate[0].idx,
749 .flags = ratetbl->rate[0].flags,
750 .count = ratetbl->rate[0].count
751 };
752
753 if (ratetbl->rate[0].idx < 0)
754 return TX_DROP;
755
756 tx->rate = rate;
757 } else {
758 return TX_DROP;
759 }
760 } else {
761 tx->rate = info->control.rates[0];
762 }
e6a9854b 763
c1ce5a74 764 if (txrc.reported_rate.idx < 0) {
0d528d85 765 txrc.reported_rate = tx->rate;
c1ce5a74 766 if (tx->sta && ieee80211_is_data(hdr->frame_control))
e5a9f8d0 767 tx->sta->tx_stats.last_rate = txrc.reported_rate;
c1ce5a74 768 } else if (tx->sta)
e5a9f8d0 769 tx->sta->tx_stats.last_rate = txrc.reported_rate;
e039fa4a 770
0d528d85
FF		 771 if (ratetbl)
772 return TX_CONTINUE;
773
e6a9854b
JB		 774 if (unlikely(!info->control.rates[0].count))
775 info->control.rates[0].count = 1;
e2ebc74d 776
9955151d
GS		 777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
778 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
779 info->control.rates[0].count = 1;
780
e6a9854b
JB		 781 return TX_CONTINUE;
782}
783
ba8c3d6f
FF		 784static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
785{
786 u16 *seq = &sta->tid_seq[tid];
787 __le16 ret = cpu_to_le16(*seq);
788
789 /* Increase the sequence number. */
790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
791
792 return ret;
793}
794
f591fa5d
JB		 795static ieee80211_tx_result debug_noinline
796ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
797{
798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
f591fa5d
JB		 800 u8 *qc;
801 int tid;
802
25d834e1
JB		 803 /*
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
807 */
5061b0c2 808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 809 return TX_CONTINUE;
810
f591fa5d
JB		 811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
812 return TX_CONTINUE;
813
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
815 return TX_CONTINUE;
816
49a59543
JB		 817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818 return TX_CONTINUE;
819
94778280
JB		 820 /*
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
c4c205f3
BC		 823 * counter. QoS data frames with a multicast destination
824 * also use the global counter (802.11-2012 9.3.2.10).
94778280 825 */
c4c205f3
BC		 826 if (!ieee80211_is_data_qos(hdr->frame_control) ||
827 is_multicast_ether_addr(hdr->addr1)) {
94778280 828 /* driver should assign sequence number */
f591fa5d 829 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 830 /* for pure STA mode without beacons, we can do it */
831 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
832 tx->sdata->sequence_number += 0x10;
79c892b8 833 if (tx->sta)
e5a9f8d0 834 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
f591fa5d
JB		 835 return TX_CONTINUE;
836 }
837
838 /*
839 * This should be true for injected/management frames only, for
840 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
841 * above since they are not QoS-data frames.
842 */
843 if (!tx->sta)
844 return TX_CONTINUE;
845
846 /* include per-STA, per-TID sequence counter */
847
848 qc = ieee80211_get_qos_ctl(hdr);
849 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
e5a9f8d0 850 tx->sta->tx_stats.msdu[tid]++;
f591fa5d 851
bb42f2d1 852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
f591fa5d
JB		 853
854 return TX_CONTINUE;
855}
856
252b86c4 857static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 858 struct sk_buff *skb, int hdrlen,
859 int frag_threshold)
860{
252b86c4 861 struct ieee80211_local *local = tx->local;
a1a3fcec 862 struct ieee80211_tx_info *info;
252b86c4 863 struct sk_buff *tmp;
2de8e0d9
JB		 864 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
865 int pos = hdrlen + per_fragm;
866 int rem = skb->len - hdrlen - per_fragm;
867
868 if (WARN_ON(rem < 0))
869 return -EINVAL;
870
252b86c4
JB		 871 /* first fragment was already added to queue by caller */
872
2de8e0d9
JB		 873 while (rem) {
874 int fraglen = per_fragm;
875
876 if (fraglen > rem)
877 fraglen = rem;
878 rem -= fraglen;
879 tmp = dev_alloc_skb(local->tx_headroom +
880 frag_threshold +
2475b1cc 881 tx->sdata->encrypt_headroom +
2de8e0d9
JB		 882 IEEE80211_ENCRYPT_TAILROOM);
883 if (!tmp)
884 return -ENOMEM;
252b86c4
JB		 885
886 __skb_queue_tail(&tx->skbs, tmp);
887
2475b1cc
MS		 888 skb_reserve(tmp,
889 local->tx_headroom + tx->sdata->encrypt_headroom);
890
2de8e0d9
JB		 891 /* copy control information */
892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 893
894 info = IEEE80211_SKB_CB(tmp);
895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
896 IEEE80211_TX_CTL_FIRST_FRAGMENT);
897
898 if (rem)
899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
900
2de8e0d9
JB		 901 skb_copy_queue_mapping(tmp, skb);
902 tmp->priority = skb->priority;
2de8e0d9 903 tmp->dev = skb->dev;
2de8e0d9
JB		 904
905 /* copy header and data */
59ae1d12
JB		 906 skb_put_data(tmp, skb->data, hdrlen);
907 skb_put_data(tmp, skb->data + pos, fraglen);
2de8e0d9
JB		 908
909 pos += fraglen;
910 }
911
252b86c4 912 /* adjust first fragment's length */
338f977f 913 skb_trim(skb, hdrlen + per_fragm);
2de8e0d9
JB		 914 return 0;
915}
916
d9e8a70f 917static ieee80211_tx_result debug_noinline
e2454948
JB		 918ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
919{
2de8e0d9
JB		 920 struct sk_buff *skb = tx->skb;
921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
922 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 923 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 924 int hdrlen;
925 int fragnum;
e2454948 926
252b86c4
JB		 927 /* no matter what happens, tx->skb moves to tx->skbs */
928 __skb_queue_tail(&tx->skbs, skb);
929 tx->skb = NULL;
930
a26eb27a
JB		 931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
932 return TX_CONTINUE;
933
f3fe4e93 934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
e2454948
JB		 935 return TX_CONTINUE;
936
eefce91a
JB		 937 /*
938 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 939 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 940 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 941 */
8b30b1fe 942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 943 return TX_DROP;
944
065e9605 945 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 946
a26eb27a 947 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 949 return TX_DROP;
e6a9854b 950
2de8e0d9
JB		 951 /*
952 * Now fragment the frame. This will allocate all the fragments and
953 * chain them (using skb as the first fragment) to skb->next.
954 * During transmission, we will remove the successfully transmitted
955 * fragments from this list. When the low-level driver rejects one
956 * of the fragments then we will simply pretend to accept the skb
957 * but store it away as pending.
958 */
252b86c4 959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 960 return TX_DROP;
e6a9854b 961
2de8e0d9
JB		 962 /* update duration/seq/flags of fragments */
963 fragnum = 0;
252b86c4
JB		 964
965 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 967
2de8e0d9
JB		 968 hdr = (void *)skb->data;
969 info = IEEE80211_SKB_CB(skb);
e6a9854b 970
252b86c4 971 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 972 hdr->frame_control |= morefrags;
e6a9854b
JB		 973 /*
974 * No multi-rate retries for fragmented frames, that
975 * would completely throw off the NAV at other STAs.
976 */
977 info->control.rates[1].idx = -1;
978 info->control.rates[2].idx = -1;
979 info->control.rates[3].idx = -1;
e3e1a0bc 980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 982 } else {
983 hdr->frame_control &= ~morefrags;
e6a9854b 984 }
2de8e0d9
JB		 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
986 fragnum++;
252b86c4 987 }
e2ebc74d 988
9ae54c84 989 return TX_CONTINUE;
e2ebc74d
JB		 990}
991
feff1f2f
JB		 992static ieee80211_tx_result debug_noinline
993ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
994{
252b86c4 995 struct sk_buff *skb;
560d2682 996 int ac = -1;
feff1f2f
JB		 997
998 if (!tx->sta)
999 return TX_CONTINUE;
1000
252b86c4 1001 skb_queue_walk(&tx->skbs, skb) {
560d2682 1002 ac = skb_get_queue_mapping(skb);
e5a9f8d0 1003 tx->sta->tx_stats.bytes[ac] += skb->len;
252b86c4 1004 }
560d2682 1005 if (ac >= 0)
e5a9f8d0 1006 tx->sta->tx_stats.packets[ac]++;
feff1f2f
JB		 1007
1008 return TX_CONTINUE;
1009}
1010
d9e8a70f 1011static ieee80211_tx_result debug_noinline
e2454948
JB		 1012ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1013{
1014 if (!tx->key)
1015 return TX_CONTINUE;
1016
97359d12
JB		 1017 switch (tx->key->conf.cipher) {
1018 case WLAN_CIPHER_SUITE_WEP40:
1019 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1020 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1021 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1022 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1023 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx, IEEE80211_CCMP_MIC_LEN);
1026 case WLAN_CIPHER_SUITE_CCMP_256:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx, IEEE80211_CCMP_256_MIC_LEN);
97359d12 1029 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1030 return ieee80211_crypto_aes_cmac_encrypt(tx);
56c52da2
JM		 1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
8ade538b
JM		 1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1035 return ieee80211_crypto_aes_gmac_encrypt(tx);
00b9cfa3
JM		 1036 case WLAN_CIPHER_SUITE_GCMP:
1037 case WLAN_CIPHER_SUITE_GCMP_256:
1038 return ieee80211_crypto_gcmp_encrypt(tx);
3ffc2a90 1039 default:
d32a1028 1040 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1041 }
1042
e2454948
JB		 1043 return TX_DROP;
1044}
1045
d9e8a70f 1046static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1047ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1048{
252b86c4 1049 struct sk_buff *skb;
2de8e0d9
JB		 1050 struct ieee80211_hdr *hdr;
1051 int next_len;
1052 bool group_addr;
03f93c3d 1053
252b86c4 1054 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1055 hdr = (void *) skb->data;
7e0aae47
JM		 1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1057 break; /* must not overwrite AID */
252b86c4
JB		 1058 if (!skb_queue_is_last(&tx->skbs, skb)) {
1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1060 next_len = next->len;
1061 } else
1062 next_len = 0;
2de8e0d9 1063 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1064
2de8e0d9 1065 hdr->duration_id =
252b86c4
JB		 1066 ieee80211_duration(tx, skb, group_addr, next_len);
1067 }
03f93c3d
JB		 1068
1069 return TX_CONTINUE;
1070}
1071
e2ebc74d
JB		 1072/* actual transmit path */
1073
a622ab72
JB		 1074static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1075 struct sk_buff *skb,
1076 struct ieee80211_tx_info *info,
1077 struct tid_ampdu_tx *tid_tx,
1078 int tid)
1079{
1080 bool queued = false;
285fa695 1081 bool reset_agg_timer = false;
aa454580 1082 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1083
1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1085 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1086 reset_agg_timer = true;
0ab33703
JB		 1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1088 /*
1089 * nothing -- this aggregation session is being started
1090 * but that might still fail with the driver
1091 */
ba8c3d6f 1092 } else if (!tx->sta->sta.txq[tid]) {
a622ab72
JB		 1093 spin_lock(&tx->sta->lock);
1094 /*
1095 * Need to re-check now, because we may get here
1096 *
1097 * 1) in the window during which the setup is actually
1098 * already done, but not marked yet because not all
1099 * packets are spliced over to the driver pending
1100 * queue yet -- if this happened we acquire the lock
1101 * either before or after the splice happens, but
1102 * need to recheck which of these cases happened.
1103 *
1104 * 2) during session teardown, if the OPERATIONAL bit
1105 * was cleared due to the teardown but the pointer
1106 * hasn't been assigned NULL yet (or we loaded it
1107 * before it was assigned) -- in this case it may
1108 * now be NULL which means we should just let the
1109 * packet pass through because splicing the frames
1110 * back is already done.
1111 */
40b275b6 1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1113
1114 if (!tid_tx) {
1115 /* do nothing, let packet pass through */
1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1117 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1118 reset_agg_timer = true;
a622ab72
JB		 1119 } else {
1120 queued = true;
f6d4671a
EG		 1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1122 clear_sta_flag(tx->sta, WLAN_STA_SP);
1123 ps_dbg(tx->sta->sdata,
1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1125 tx->sta->sta.addr, tx->sta->sta.aid);
1126 }
a622ab72
JB		 1127 info->control.vif = &tx->sdata->vif;
1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
facde7f3 1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
a622ab72 1130 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1132 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1133 }
1134 spin_unlock(&tx->sta->lock);
aa454580
HS		 1135
1136 if (purge_skb)
c3e7724b 1137 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1138 }
1139
285fa695
NM		 1140 /* reset session timer */
1141 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1142 tid_tx->last_tx = jiffies;
285fa695 1143
a622ab72
JB		 1144 return queued;
1145}
1146
58d4185e
JB		 1147/*
1148 * initialises @tx
7c10770f
JB		 1149 * pass %NULL for the station if unknown, a valid pointer if known
1150 * or an ERR_PTR() if the station is known not to exist
58d4185e 1151 */
9ae54c84 1152static ieee80211_tx_result
3b8d81e0
JB		 1153ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1154 struct ieee80211_tx_data *tx,
7c10770f 1155 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1156{
3b8d81e0 1157 struct ieee80211_local *local = sdata->local;
58d4185e 1158 struct ieee80211_hdr *hdr;
e039fa4a 1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1160 int tid;
a622ab72 1161 u8 *qc;
e2ebc74d
JB		 1162
1163 memset(tx, 0, sizeof(*tx));
1164 tx->skb = skb;
e2ebc74d 1165 tx->local = local;
3b8d81e0 1166 tx->sdata = sdata;
252b86c4 1167 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1168
cd8ffc80
JB		 1169 /*
1170 * If this flag is set to true anywhere, and we get here,
1171 * we are doing the needed processing, so remove the flag
1172 * now.
1173 */
1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1175
58d4185e
JB		 1176 hdr = (struct ieee80211_hdr *) skb->data;
1177
7c10770f
JB		 1178 if (likely(sta)) {
1179 if (!IS_ERR(sta))
1180 tx->sta = sta;
1181 } else {
1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1183 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1184 if (!tx->sta && sdata->wdev.use_4addr)
1185 return TX_DROP;
1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1187 IEEE80211_TX_CTL_INJECTED) ||
1188 tx->sdata->control_port_protocol == tx->skb->protocol) {
1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1190 }
1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1192 tx->sta = sta_info_get(sdata, hdr->addr1);
3f0e0b22 1193 }
58d4185e 1194
cd8ffc80 1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
30686bf7
JB		 1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1199 struct tid_ampdu_tx *tid_tx;
1200
8b30b1fe
S		 1201 qc = ieee80211_get_qos_ctl(hdr);
1202 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1203
a622ab72
JB		 1204 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1205 if (tid_tx) {
1206 bool queued;
cd8ffc80 1207
a622ab72
JB		 1208 queued = ieee80211_tx_prep_agg(tx, skb, info,
1209 tid_tx, tid);
1210
1211 if (unlikely(queued))
1212 return TX_QUEUED;
1213 }
8b30b1fe
S		 1214 }
1215
badffb72 1216 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1217 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1218 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1219 } else
5cf121c3 1220 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1221
a26eb27a
JB		 1222 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1223 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1224 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1225 info->flags & IEEE80211_TX_CTL_AMPDU)
1226 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1227 }
1228
e2ebc74d 1229 if (!tx->sta)
e039fa4a 1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1 1231 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
e039fa4a 1232 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1
FF		 1233 ieee80211_check_fast_xmit(tx->sta);
1234 }
58d4185e 1235
e039fa4a 1236 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1237
9ae54c84 1238 return TX_CONTINUE;
e2ebc74d
JB		 1239}
1240
80a83cfc
MK		 1241static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1242 struct ieee80211_vif *vif,
dbef5362 1243 struct sta_info *sta,
80a83cfc 1244 struct sk_buff *skb)
ba8c3d6f
FF		 1245{
1246 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
ba8c3d6f 1247 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
ba8c3d6f 1248 struct ieee80211_txq *txq = NULL;
ba8c3d6f 1249
c3732a7b
FF		 1250 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1251 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
80a83cfc 1252 return NULL;
ba8c3d6f
FF		 1253
1254 if (!ieee80211_is_data(hdr->frame_control))
80a83cfc 1255 return NULL;
ba8c3d6f 1256
dbef5362 1257 if (sta) {
ba8c3d6f
FF		 1258 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1259
dbef5362
MK		 1260 if (!sta->uploaded)
1261 return NULL;
1262
1263 txq = sta->sta.txq[tid];
ba8c3d6f
FF		 1264 } else if (vif) {
1265 txq = vif->txq;
1266 }
1267
1268 if (!txq)
80a83cfc 1269 return NULL;
ba8c3d6f 1270
80a83cfc
MK		 1271 return to_txq_info(txq);
1272}
ba8c3d6f 1273
5caa328e
MK		 1274static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1275{
1276 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1277}
1278
1279static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1280{
1281 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1282}
1283
1284static u32 codel_skb_len_func(const struct sk_buff *skb)
1285{
1286 return skb->len;
1287}
1288
1289static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1290{
1291 const struct ieee80211_tx_info *info;
1292
1293 info = (const struct ieee80211_tx_info *)skb->cb;
1294 return info->control.enqueue_time;
1295}
1296
1297static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1298 void *ctx)
1299{
1300 struct ieee80211_local *local;
1301 struct txq_info *txqi;
1302 struct fq *fq;
1303 struct fq_flow *flow;
1304
1305 txqi = ctx;
1306 local = vif_to_sdata(txqi->txq.vif)->local;
1307 fq = &local->fq;
1308
1309 if (cvars == &txqi->def_cvars)
1310 flow = &txqi->def_flow;
1311 else
1312 flow = &fq->flows[cvars - local->cvars];
1313
1314 return fq_flow_dequeue(fq, flow);
1315}
1316
1317static void codel_drop_func(struct sk_buff *skb,
1318 void *ctx)
1319{
1320 struct ieee80211_local *local;
1321 struct ieee80211_hw *hw;
1322 struct txq_info *txqi;
1323
1324 txqi = ctx;
1325 local = vif_to_sdata(txqi->txq.vif)->local;
1326 hw = &local->hw;
1327
1328 ieee80211_free_txskb(hw, skb);
1329}
1330
fa962b92
MK		 1331static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1332 struct fq_tin *tin,
1333 struct fq_flow *flow)
1334{
5caa328e
MK		 1335 struct ieee80211_local *local;
1336 struct txq_info *txqi;
1337 struct codel_vars *cvars;
1338 struct codel_params *cparams;
1339 struct codel_stats *cstats;
1340
1341 local = container_of(fq, struct ieee80211_local, fq);
1342 txqi = container_of(tin, struct txq_info, tin);
8d51dbb8 1343 cstats = &txqi->cstats;
5caa328e 1344
484a54c2
THJ		 1345 if (txqi->txq.sta) {
1346 struct sta_info *sta = container_of(txqi->txq.sta,
1347 struct sta_info, sta);
1348 cparams = &sta->cparams;
1349 } else {
1350 cparams = &local->cparams;
1351 }
1352
5caa328e
MK		 1353 if (flow == &txqi->def_flow)
1354 cvars = &txqi->def_cvars;
1355 else
1356 cvars = &local->cvars[flow - fq->flows];
1357
1358 return codel_dequeue(txqi,
1359 &flow->backlog,
1360 cparams,
1361 cvars,
1362 cstats,
1363 codel_skb_len_func,
1364 codel_skb_time_func,
1365 codel_drop_func,
1366 codel_dequeue_func);
fa962b92
MK		 1367}
1368
1369static void fq_skb_free_func(struct fq *fq,
1370 struct fq_tin *tin,
1371 struct fq_flow *flow,
1372 struct sk_buff *skb)
1373{
1374 struct ieee80211_local *local;
1375
1376 local = container_of(fq, struct ieee80211_local, fq);
1377 ieee80211_free_txskb(&local->hw, skb);
1378}
1379
1380static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1381 struct fq_tin *tin,
1382 int idx,
1383 struct sk_buff *skb)
1384{
1385 struct txq_info *txqi;
1386
1387 txqi = container_of(tin, struct txq_info, tin);
1388 return &txqi->def_flow;
1389}
1390
80a83cfc
MK		 1391static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1392 struct txq_info *txqi,
1393 struct sk_buff *skb)
1394{
fa962b92
MK		 1395 struct fq *fq = &local->fq;
1396 struct fq_tin *tin = &txqi->tin;
f2ac7e30 1397
5caa328e 1398 ieee80211_set_skb_enqueue_time(skb);
fa962b92
MK		 1399 fq_tin_enqueue(fq, tin, skb,
1400 fq_skb_free_func,
1401 fq_flow_get_default_func);
1402}
ba8c3d6f 1403
fa962b92
MK		 1404void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1405 struct sta_info *sta,
1406 struct txq_info *txqi, int tid)
1407{
1408 fq_tin_init(&txqi->tin);
1409 fq_flow_init(&txqi->def_flow);
5caa328e 1410 codel_vars_init(&txqi->def_cvars);
8d51dbb8 1411 codel_stats_init(&txqi->cstats);
bb42f2d1 1412 __skb_queue_head_init(&txqi->frags);
fa962b92
MK		 1413
1414 txqi->txq.vif = &sdata->vif;
1415
1416 if (sta) {
1417 txqi->txq.sta = &sta->sta;
1418 sta->sta.txq[tid] = &txqi->txq;
1419 txqi->txq.tid = tid;
731977e9 1420 txqi->txq.ac = ieee80211_ac_from_tid(tid);
fa962b92
MK		 1421 } else {
1422 sdata->vif.txq = &txqi->txq;
1423 txqi->txq.tid = 0;
1424 txqi->txq.ac = IEEE80211_AC_BE;
80a83cfc 1425 }
fa962b92 1426}
ba8c3d6f 1427
fa962b92
MK		 1428void ieee80211_txq_purge(struct ieee80211_local *local,
1429 struct txq_info *txqi)
1430{
1431 struct fq *fq = &local->fq;
1432 struct fq_tin *tin = &txqi->tin;
1433
1434 fq_tin_reset(fq, tin, fq_skb_free_func);
bb42f2d1 1435 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
fa962b92
MK		 1436}
1437
1438int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1439{
1440 struct fq *fq = &local->fq;
1441 int ret;
5caa328e 1442 int i;
3ff23cd5
THJ		 1443 bool supp_vht = false;
1444 enum nl80211_band band;
fa962b92
MK		 1445
1446 if (!local->ops->wake_tx_queue)
1447 return 0;
1448
1449 ret = fq_init(fq, 4096);
1450 if (ret)
1451 return ret;
1452
3ff23cd5
THJ		 1453 /*
1454 * If the hardware doesn't support VHT, it is safe to limit the maximum
1455 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1456 */
1457 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1458 struct ieee80211_supported_band *sband;
1459
1460 sband = local->hw.wiphy->bands[band];
1461 if (!sband)
1462 continue;
1463
1464 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1465 }
1466
1467 if (!supp_vht)
1468 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1469
5caa328e 1470 codel_params_init(&local->cparams);
5caa328e
MK		 1471 local->cparams.interval = MS2TIME(100);
1472 local->cparams.target = MS2TIME(20);
1473 local->cparams.ecn = true;
1474
1475 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1476 GFP_KERNEL);
1477 if (!local->cvars) {
59a7c828 1478 spin_lock_bh(&fq->lock);
5caa328e 1479 fq_reset(fq, fq_skb_free_func);
59a7c828 1480 spin_unlock_bh(&fq->lock);
5caa328e
MK		 1481 return -ENOMEM;
1482 }
1483
1484 for (i = 0; i < fq->flows_cnt; i++)
1485 codel_vars_init(&local->cvars[i]);
1486
fa962b92
MK		 1487 return 0;
1488}
1489
1490void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1491{
1492 struct fq *fq = &local->fq;
1493
1494 if (!local->ops->wake_tx_queue)
1495 return;
1496
5caa328e
MK		 1497 kfree(local->cvars);
1498 local->cvars = NULL;
1499
59a7c828 1500 spin_lock_bh(&fq->lock);
fa962b92 1501 fq_reset(fq, fq_skb_free_func);
59a7c828 1502 spin_unlock_bh(&fq->lock);
ba8c3d6f
FF		 1503}
1504
bb42f2d1
THJ		 1505static bool ieee80211_queue_skb(struct ieee80211_local *local,
1506 struct ieee80211_sub_if_data *sdata,
1507 struct sta_info *sta,
1508 struct sk_buff *skb)
1509{
bb42f2d1
THJ		 1510 struct fq *fq = &local->fq;
1511 struct ieee80211_vif *vif;
1512 struct txq_info *txqi;
bb42f2d1
THJ		 1513
1514 if (!local->ops->wake_tx_queue ||
1515 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1516 return false;
1517
bb42f2d1
THJ		 1518 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1519 sdata = container_of(sdata->bss,
1520 struct ieee80211_sub_if_data, u.ap);
1521
1522 vif = &sdata->vif;
dbef5362 1523 txqi = ieee80211_get_txq(local, vif, sta, skb);
bb42f2d1
THJ		 1524
1525 if (!txqi)
1526 return false;
1527
bb42f2d1
THJ		 1528 spin_lock_bh(&fq->lock);
1529 ieee80211_txq_enqueue(local, txqi, skb);
1530 spin_unlock_bh(&fq->lock);
1531
1532 drv_wake_tx_queue(local, txqi);
1533
1534 return true;
1535}
1536
11127e91
JB		 1537static bool ieee80211_tx_frags(struct ieee80211_local *local,
1538 struct ieee80211_vif *vif,
1539 struct ieee80211_sta *sta,
1540 struct sk_buff_head *skbs,
1541 bool txpending)
e2ebc74d 1542{
80a83cfc 1543 struct ieee80211_tx_control control = {};
252b86c4 1544 struct sk_buff *skb, *tmp;
3b8d81e0 1545 unsigned long flags;
e2ebc74d 1546
252b86c4 1547 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1548 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1549 int q = info->hw_queue;
1550
1551#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1552 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1553 __skb_unlink(skb, skbs);
c3e7724b 1554 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1555 continue;
1556 }
1557#endif
3b8d81e0
JB		 1558
1559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1560 if (local->queue_stop_reasons[q] ||
7bb45683 1561 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1562 if (unlikely(info->flags &
a7679ed5
SF		 1563 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1564 if (local->queue_stop_reasons[q] &
1565 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1566 /*
1567 * Drop off-channel frames if queues
1568 * are stopped for any reason other
1569 * than off-channel operation. Never
1570 * queue them.
1571 */
1572 spin_unlock_irqrestore(
1573 &local->queue_stop_reason_lock,
1574 flags);
1575 ieee80211_purge_tx_queue(&local->hw,
1576 skbs);
1577 return true;
1578 }
1579 } else {
1580
6c17b77b 1581 /*
a7679ed5
SF		 1582 * Since queue is stopped, queue up frames for
1583 * later transmission from the tx-pending
1584 * tasklet when the queue is woken again.
6c17b77b 1585 */
a7679ed5
SF		 1586 if (txpending)
1587 skb_queue_splice_init(skbs,
1588 &local->pending[q]);
1589 else
1590 skb_queue_splice_tail_init(skbs,
1591 &local->pending[q]);
1592
1593 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1594 flags);
1595 return false;
6c17b77b 1596 }
7bb45683 1597 }
3b8d81e0 1598 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1599
11127e91 1600 info->control.vif = vif;
80a83cfc 1601 control.sta = sta;
f0e72851 1602
11127e91 1603 __skb_unlink(skb, skbs);
80a83cfc 1604 drv_tx(local, &control, skb);
11127e91 1605 }
5061b0c2 1606
11127e91
JB		 1607 return true;
1608}
1609
1610/*
1611 * Returns false if the frame couldn't be transmitted but was queued instead.
1612 */
1613static bool __ieee80211_tx(struct ieee80211_local *local,
1614 struct sk_buff_head *skbs, int led_len,
1615 struct sta_info *sta, bool txpending)
1616{
1617 struct ieee80211_tx_info *info;
1618 struct ieee80211_sub_if_data *sdata;
1619 struct ieee80211_vif *vif;
1620 struct ieee80211_sta *pubsta;
1621 struct sk_buff *skb;
1622 bool result = true;
1623 __le16 fc;
5061b0c2 1624
11127e91
JB		 1625 if (WARN_ON(skb_queue_empty(skbs)))
1626 return true;
ec25acc4 1627
11127e91
JB		 1628 skb = skb_peek(skbs);
1629 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1630 info = IEEE80211_SKB_CB(skb);
1631 sdata = vif_to_sdata(info->control.vif);
1632 if (sta && !sta->uploaded)
1633 sta = NULL;
1634
1635 if (sta)
1636 pubsta = &sta->sta;
1637 else
1638 pubsta = NULL;
1639
1640 switch (sdata->vif.type) {
1641 case NL80211_IFTYPE_MONITOR:
d8212184 1642 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
c82b5a74
JB		 1643 vif = &sdata->vif;
1644 break;
1645 }
4b6f1dd6 1646 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1647 if (sdata) {
4b6f1dd6 1648 vif = &sdata->vif;
3a25a8c8
JB		 1649 info->hw_queue =
1650 vif->hw_queue[skb_get_queue_mapping(skb)];
30686bf7 1651 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
63b4d8b3 1652 ieee80211_purge_tx_queue(&local->hw, skbs);
3a25a8c8
JB		 1653 return true;
1654 } else
4b6f1dd6 1655 vif = NULL;
11127e91
JB		 1656 break;
1657 case NL80211_IFTYPE_AP_VLAN:
1658 sdata = container_of(sdata->bss,
1659 struct ieee80211_sub_if_data, u.ap);
1660 /* fall through */
1661 default:
1662 vif = &sdata->vif;
1663 break;
e2ebc74d 1664 }
2de8e0d9 1665
cb831b53
JB		 1666 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1667 txpending);
11127e91 1668
74e4dbfd 1669 ieee80211_tpt_led_trig_tx(local, fc, led_len);
74e4dbfd 1670
4db4e0a1 1671 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1672
11127e91 1673 return result;
e2ebc74d
JB		 1674}
1675
97b045d6
JB		 1676/*
1677 * Invoke TX handlers, return 0 on success and non-zero if the
1678 * frame was dropped or queued.
bb42f2d1
THJ		 1679 *
1680 * The handlers are split into an early and late part. The latter is everything
1681 * that can be sensitive to reordering, and will be deferred to after packets
1682 * are dequeued from the intermediate queues (when they are enabled).
97b045d6 1683 */
bb42f2d1 1684static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
97b045d6 1685{
97b045d6 1686 ieee80211_tx_result res = TX_DROP;
97b045d6 1687
9aa4aee3
JB		 1688#define CALL_TXH(txh) \
1689 do { \
1690 res = txh(tx); \
1691 if (res != TX_CONTINUE) \
1692 goto txh_done; \
1693 } while (0)
1694
5c1b98a5 1695 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1696 CALL_TXH(ieee80211_tx_h_check_assoc);
1697 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1698 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1699 CALL_TXH(ieee80211_tx_h_select_key);
30686bf7 1700 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
af65cd96 1701 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1702
bb42f2d1
THJ		 1703 txh_done:
1704 if (unlikely(res == TX_DROP)) {
1705 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1706 if (tx->skb)
1707 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1708 else
1709 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1710 return -1;
1711 } else if (unlikely(res == TX_QUEUED)) {
1712 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1713 return -1;
1714 }
1715
1716 return 0;
1717}
1718
1719/*
1720 * Late handlers can be called while the sta lock is held. Handlers that can
1721 * cause packets to be generated will cause deadlock!
1722 */
1723static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1724{
1725 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1726 ieee80211_tx_result res = TX_CONTINUE;
1727
aa5b5492
JB		 1728 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1729 __skb_queue_tail(&tx->skbs, tx->skb);
1730 tx->skb = NULL;
c6fcf6bc 1731 goto txh_done;
aa5b5492 1732 }
c6fcf6bc
JB		 1733
1734 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1735 CALL_TXH(ieee80211_tx_h_sequence);
1736 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1737 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1738 CALL_TXH(ieee80211_tx_h_stats);
1739 CALL_TXH(ieee80211_tx_h_encrypt);
30686bf7 1740 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
8fd369ee 1741 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1742#undef CALL_TXH
97b045d6 1743
d9e8a70f 1744 txh_done:
97b045d6 1745 if (unlikely(res == TX_DROP)) {
5479d0e7 1746 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1747 if (tx->skb)
c3e7724b 1748 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1749 else
1f98ab7f 1750 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1751 return -1;
1752 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1753 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1754 return -1;
1755 }
1756
1757 return 0;
1758}
1759
bb42f2d1
THJ		 1760static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1761{
1762 int r = invoke_tx_handlers_early(tx);
1763
1764 if (r)
1765 return r;
1766 return invoke_tx_handlers_late(tx);
1767}
1768
06be6b14
FF		 1769bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1770 struct ieee80211_vif *vif, struct sk_buff *skb,
1771 int band, struct ieee80211_sta **sta)
1772{
1773 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1774 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1775 struct ieee80211_tx_data tx;
88724a81 1776 struct sk_buff *skb2;
06be6b14 1777
7c10770f 1778 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
06be6b14
FF		 1779 return false;
1780
1781 info->band = band;
1782 info->control.vif = vif;
1783 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1784
1785 if (invoke_tx_handlers(&tx))
1786 return false;
1787
1788 if (sta) {
1789 if (tx.sta)
1790 *sta = &tx.sta->sta;
1791 else
1792 *sta = NULL;
1793 }
1794
88724a81
JB		 1795 /* this function isn't suitable for fragmented data frames */
1796 skb2 = __skb_dequeue(&tx.skbs);
1797 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1798 ieee80211_free_txskb(hw, skb2);
1799 ieee80211_purge_tx_queue(hw, &tx.skbs);
1800 return false;
1801 }
1802
06be6b14
FF		 1803 return true;
1804}
1805EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1806
7bb45683
JB		 1807/*
1808 * Returns false if the frame couldn't be transmitted but was queued instead.
1809 */
1810static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
7c10770f
JB		 1811 struct sta_info *sta, struct sk_buff *skb,
1812 bool txpending)
e2ebc74d 1813{
3b8d81e0 1814 struct ieee80211_local *local = sdata->local;
5cf121c3 1815 struct ieee80211_tx_data tx;
97b045d6 1816 ieee80211_tx_result res_prepare;
e039fa4a 1817 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1818 bool result = true;
74e4dbfd 1819 int led_len;
e2ebc74d 1820
e2ebc74d
JB		 1821 if (unlikely(skb->len < 10)) {
1822 dev_kfree_skb(skb);
7bb45683 1823 return true;
e2ebc74d
JB		 1824 }
1825
58d4185e 1826 /* initialises tx */
74e4dbfd 1827 led_len = skb->len;
7c10770f 1828 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
e2ebc74d 1829
cd8ffc80 1830 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1831 ieee80211_free_txskb(&local->hw, skb);
55de908a 1832 return true;
cd8ffc80 1833 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1834 return true;
e2ebc74d
JB		 1835 }
1836
3a25a8c8
JB		 1837 /* set up hw_queue value early */
1838 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
30686bf7 1839 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3a25a8c8
JB		 1840 info->hw_queue =
1841 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1842
bb42f2d1
THJ		 1843 if (invoke_tx_handlers_early(&tx))
1844 return false;
1845
1846 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1847 return true;
1848
1849 if (!invoke_tx_handlers_late(&tx))
74e4dbfd
JB		 1850 result = __ieee80211_tx(local, &tx.skbs, led_len,
1851 tx.sta, txpending);
55de908a 1852
7bb45683 1853 return result;
e2ebc74d
JB		 1854}
1855
1856/* device xmit handlers */
1857
3bff1865 1858static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1859 struct sk_buff *skb,
1860 int head_need, bool may_encrypt)
1861{
3bff1865 1862 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1863 int tail_need = 0;
1864
3bff1865 1865 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1866 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1867 tail_need -= skb_tailroom(skb);
1868 tail_need = max_t(int, tail_need, 0);
1869 }
1870
c70f59a2 1871 if (skb_cloned(skb) &&
30686bf7 1872 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
c70f59a2 1873 !skb_clone_writable(skb, ETH_HLEN) ||
17c18bf8 1874 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
23c0752a 1875 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1876 else if (head_need || tail_need)
23c0752a 1877 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1878 else
1879 return 0;
23c0752a
JB		 1880
1881 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1882 wiphy_debug(local->hw.wiphy,
1883 "failed to reallocate TX buffer\n");
23c0752a
JB		 1884 return -ENOMEM;
1885 }
1886
23c0752a
JB		 1887 return 0;
1888}
1889
7c10770f
JB		 1890void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1891 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1892{
3b8d81e0 1893 struct ieee80211_local *local = sdata->local;
e039fa4a 1894 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1896 int headroom;
23c0752a 1897 bool may_encrypt;
e2ebc74d 1898
3b8d81e0 1899 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1900
3b8d81e0 1901 headroom = local->tx_headroom;
23c0752a 1902 if (may_encrypt)
2475b1cc 1903 headroom += sdata->encrypt_headroom;
23c0752a
JB		 1904 headroom -= skb_headroom(skb);
1905 headroom = max_t(int, 0, headroom);
1906
3bff1865 1907 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1908 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1909 return;
e2ebc74d
JB		 1910 }
1911
740c1aa3 1912 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1913 info->control.vif = &sdata->vif;
e2ebc74d 1914
3f52b7e3
MP		 1915 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1916 if (ieee80211_is_data(hdr->frame_control) &&
1917 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1918 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1919 return; /* skb queued: don't free */
1920 } else {
1921 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1922 }
98aed9fd 1923 }
cca89496 1924
2154c81c 1925 ieee80211_set_qos_hdr(sdata, skb);
7c10770f 1926 ieee80211_tx(sdata, sta, skb, false);
e2ebc74d
JB		 1927}
1928
dfdfc2be
SE		 1929static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1930 struct sk_buff *skb)
73b9f03a
JB		 1931{
1932 struct ieee80211_radiotap_iterator iterator;
1933 struct ieee80211_radiotap_header *rthdr =
1934 (struct ieee80211_radiotap_header *) skb->data;
1935 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
dfdfc2be
SE		 1936 struct ieee80211_supported_band *sband =
1937 local->hw.wiphy->bands[info->band];
73b9f03a
JB		 1938 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1939 NULL);
1940 u16 txflags;
dfdfc2be
SE		 1941 u16 rate = 0;
1942 bool rate_found = false;
1943 u8 rate_retries = 0;
1944 u16 rate_flags = 0;
f66b60f6 1945 u8 mcs_known, mcs_flags, mcs_bw;
646e76bb
LB		 1946 u16 vht_known;
1947 u8 vht_mcs = 0, vht_nss = 0;
dfdfc2be 1948 int i;
73b9f03a
JB		 1949
1950 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1951 IEEE80211_TX_CTL_DONTFRAG;
1952
1953 /*
1954 * for every radiotap entry that is present
1955 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1956 * entries present, or -EINVAL on error)
1957 */
1958
1959 while (!ret) {
1960 ret = ieee80211_radiotap_iterator_next(&iterator);
1961
1962 if (ret)
1963 continue;
1964
1965 /* see if this argument is something we can use */
1966 switch (iterator.this_arg_index) {
1967 /*
1968 * You must take care when dereferencing iterator.this_arg
1969 * for multibyte types... the pointer is not aligned. Use
1970 * get_unaligned((type *)iterator.this_arg) to dereference
1971 * iterator.this_arg for type "type" safely on all arches.
1972 */
1973 case IEEE80211_RADIOTAP_FLAGS:
1974 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1975 /*
1976 * this indicates that the skb we have been
1977 * handed has the 32-bit FCS CRC at the end...
1978 * we should react to that by snipping it off
1979 * because it will be recomputed and added
1980 * on transmission
1981 */
1982 if (skb->len < (iterator._max_length + FCS_LEN))
1983 return false;
1984
1985 skb_trim(skb, skb->len - FCS_LEN);
1986 }
1987 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1988 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1989 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1990 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1991 break;
1992
1993 case IEEE80211_RADIOTAP_TX_FLAGS:
1994 txflags = get_unaligned_le16(iterator.this_arg);
1995 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1996 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1997 break;
1998
dfdfc2be
SE		 1999 case IEEE80211_RADIOTAP_RATE:
2000 rate = *iterator.this_arg;
2001 rate_flags = 0;
2002 rate_found = true;
2003 break;
2004
2005 case IEEE80211_RADIOTAP_DATA_RETRIES:
2006 rate_retries = *iterator.this_arg;
2007 break;
2008
2009 case IEEE80211_RADIOTAP_MCS:
2010 mcs_known = iterator.this_arg[0];
2011 mcs_flags = iterator.this_arg[1];
2012 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2013 break;
2014
2015 rate_found = true;
2016 rate = iterator.this_arg[2];
2017 rate_flags = IEEE80211_TX_RC_MCS;
2018
2019 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2020 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2021 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2022
f66b60f6 2023 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
dfdfc2be 2024 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
f66b60f6 2025 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
dfdfc2be
SE		 2026 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2027 break;
2028
646e76bb
LB		 2029 case IEEE80211_RADIOTAP_VHT:
2030 vht_known = get_unaligned_le16(iterator.this_arg);
2031 rate_found = true;
2032
2033 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2034 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2035 (iterator.this_arg[2] &
2036 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2037 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2038 if (vht_known &
2039 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2040 if (iterator.this_arg[3] == 1)
2041 rate_flags |=
2042 IEEE80211_TX_RC_40_MHZ_WIDTH;
2043 else if (iterator.this_arg[3] == 4)
2044 rate_flags |=
2045 IEEE80211_TX_RC_80_MHZ_WIDTH;
2046 else if (iterator.this_arg[3] == 11)
2047 rate_flags |=
2048 IEEE80211_TX_RC_160_MHZ_WIDTH;
2049 }
2050
2051 vht_mcs = iterator.this_arg[4] >> 4;
2052 vht_nss = iterator.this_arg[4] & 0xF;
2053 break;
2054
73b9f03a
JB		 2055 /*
2056 * Please update the file
2057 * Documentation/networking/mac80211-injection.txt
2058 * when parsing new fields here.
2059 */
2060
2061 default:
2062 break;
2063 }
2064 }
2065
2066 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2067 return false;
2068
dfdfc2be
SE		 2069 if (rate_found) {
2070 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2071
2072 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2073 info->control.rates[i].idx = -1;
2074 info->control.rates[i].flags = 0;
2075 info->control.rates[i].count = 0;
2076 }
2077
2078 if (rate_flags & IEEE80211_TX_RC_MCS) {
2079 info->control.rates[0].idx = rate;
646e76bb
LB		 2080 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2081 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2082 vht_nss);
dfdfc2be
SE		 2083 } else {
2084 for (i = 0; i < sband->n_bitrates; i++) {
2085 if (rate * 5 != sband->bitrates[i].bitrate)
2086 continue;
2087
2088 info->control.rates[0].idx = i;
2089 break;
2090 }
2091 }
2092
07310a63
FF		 2093 if (info->control.rates[0].idx < 0)
2094 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2095
dfdfc2be
SE		 2096 info->control.rates[0].flags = rate_flags;
2097 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2098 local->hw.max_rate_tries);
2099 }
2100
73b9f03a
JB		 2101 /*
2102 * remove the radiotap header
2103 * iterator->_max_length was sanity-checked against
2104 * skb->len by iterator init
2105 */
2106 skb_pull(skb, iterator._max_length);
2107
2108 return true;
2109}
2110
d0cf9c0d
SH		 2111netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2112 struct net_device *dev)
e2ebc74d
JB		 2113{
2114 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a 2115 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d
JB		 2116 struct ieee80211_radiotap_header *prthdr =
2117 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 2118 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 2119 struct ieee80211_hdr *hdr;
5d9cf4a5 2120 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
b4932836 2121 struct cfg80211_chan_def *chandef;
9b8a74e3 2122 u16 len_rthdr;
5d9cf4a5 2123 int hdrlen;
e2ebc74d 2124
9b8a74e3
AG		 2125 /* check for not even having the fixed radiotap header part */
2126 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2127 goto fail; /* too short to be possibly valid */
2128
2129 /* is it a header version we can trust to find length from? */
2130 if (unlikely(prthdr->it_version))
2131 goto fail; /* only version 0 is supported */
2132
2133 /* then there must be a radiotap header with a length we can use */
2134 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2135
2136 /* does the skb contain enough to deliver on the alleged length? */
2137 if (unlikely(skb->len < len_rthdr))
2138 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 2139
e2ebc74d
JB		 2140 /*
2141 * fix up the pointers accounting for the radiotap
2142 * header still being in there. We are being given
2143 * a precooked IEEE80211 header so no need for
2144 * normal processing
2145 */
9b8a74e3 2146 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 2147 /*
9b8a74e3
AG		 2148 * these are just fixed to the end of the rt area since we
2149 * don't have any better information and at this point, nobody cares
e2ebc74d 2150 */
9b8a74e3
AG		 2151 skb_set_network_header(skb, len_rthdr);
2152 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 2153
5d9cf4a5
JB		 2154 if (skb->len < len_rthdr + 2)
2155 goto fail;
2156
2157 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2158 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2159
2160 if (skb->len < len_rthdr + hdrlen)
2161 goto fail;
2162
f75f5c6f
HS		 2163 /*
2164 * Initialize skb->protocol if the injected frame is a data frame
2165 * carrying a rfc1042 header
2166 */
5d9cf4a5
JB		 2167 if (ieee80211_is_data(hdr->frame_control) &&
2168 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2169 u8 *payload = (u8 *)hdr + hdrlen;
2170
b203ca39 2171 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 2172 skb->protocol = cpu_to_be16((payload[6] << 8) |
2173 payload[7]);
f75f5c6f
HS		 2174 }
2175
3b8d81e0
JB		 2176 memset(info, 0, sizeof(*info));
2177
5d9cf4a5 2178 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 2179 IEEE80211_TX_CTL_INJECTED;
2180
5d9cf4a5
JB		 2181 rcu_read_lock();
2182
2183 /*
2184 * We process outgoing injected frames that have a local address
2185 * we handle as though they are non-injected frames.
2186 * This code here isn't entirely correct, the local MAC address
2187 * isn't always enough to find the interface to use; for proper
2188 * VLAN/WDS support we will need a different mechanism (which
2189 * likely isn't going to be monitor interfaces).
2190 */
2191 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2192
2193 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2194 if (!ieee80211_sdata_running(tmp_sdata))
2195 continue;
2196 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2197 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2198 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2199 continue;
b203ca39 2200 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 2201 sdata = tmp_sdata;
2202 break;
2203 }
2204 }
7351c6bd 2205
55de908a
JB		 2206 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2207 if (!chanctx_conf) {
2208 tmp_sdata = rcu_dereference(local->monitor_sdata);
2209 if (tmp_sdata)
2210 chanctx_conf =
2211 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2212 }
55de908a 2213
b4a7ff75 2214 if (chanctx_conf)
b4932836 2215 chandef = &chanctx_conf->def;
b4a7ff75 2216 else if (!local->use_chanctx)
b4932836 2217 chandef = &local->_oper_chandef;
b4a7ff75
FF		 2218 else
2219 goto fail_rcu;
55de908a
JB		 2220
2221 /*
2222 * Frame injection is not allowed if beaconing is not allowed
2223 * or if we need radar detection. Beaconing is usually not allowed when
2224 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2225 * Passive scan is also used in world regulatory domains where
2226 * your country is not known and as such it should be treated as
2227 * NO TX unless the channel is explicitly allowed in which case
2228 * your current regulatory domain would not have the passive scan
2229 * flag.
2230 *
2231 * Since AP mode uses monitor interfaces to inject/TX management
2232 * frames we can make AP mode the exception to this rule once it
2233 * supports radar detection as its implementation can deal with
2234 * radar detection by itself. We can do that later by adding a
2235 * monitor flag interfaces used for AP support.
2236 */
b4932836
JD		 2237 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2238 sdata->vif.type))
55de908a
JB		 2239 goto fail_rcu;
2240
73c4e195 2241 info->band = chandef->chan->band;
109843b0
LB		 2242
2243 /* process and remove the injection radiotap header */
2244 if (!ieee80211_parse_tx_radiotap(local, skb))
2245 goto fail_rcu;
2246
7c10770f 2247 ieee80211_xmit(sdata, NULL, skb);
5d9cf4a5
JB		 2248 rcu_read_unlock();
2249
e2ebc74d 2250 return NETDEV_TX_OK;
9b8a74e3 2251
55de908a
JB		 2252fail_rcu:
2253 rcu_read_unlock();
9b8a74e3
AG		 2254fail:
2255 dev_kfree_skb(skb);
2256 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 2257}
2258
97ffe757 2259static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
ad38bfc9 2260{
97ffe757 2261 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
ad38bfc9 2262
97ffe757
JB		 2263 return ethertype == ETH_P_TDLS &&
2264 skb->len > 14 &&
2265 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2266}
2267
2268static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2269 struct sk_buff *skb,
2270 struct sta_info **sta_out)
2271{
2272 struct sta_info *sta;
2273
2274 switch (sdata->vif.type) {
2275 case NL80211_IFTYPE_AP_VLAN:
2276 sta = rcu_dereference(sdata->u.vlan.sta);
2277 if (sta) {
2278 *sta_out = sta;
2279 return 0;
2280 } else if (sdata->wdev.use_4addr) {
2281 return -ENOLINK;
2282 }
2283 /* fall through */
2284 case NL80211_IFTYPE_AP:
2285 case NL80211_IFTYPE_OCB:
2286 case NL80211_IFTYPE_ADHOC:
2287 if (is_multicast_ether_addr(skb->data)) {
2288 *sta_out = ERR_PTR(-ENOENT);
2289 return 0;
2290 }
2291 sta = sta_info_get_bss(sdata, skb->data);
2292 break;
2293 case NL80211_IFTYPE_WDS:
2294 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2295 break;
2296#ifdef CONFIG_MAC80211_MESH
2297 case NL80211_IFTYPE_MESH_POINT:
2298 /* determined much later */
2299 *sta_out = NULL;
2300 return 0;
2301#endif
2302 case NL80211_IFTYPE_STATION:
2303 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2304 sta = sta_info_get(sdata, skb->data);
11d62caf
JB		 2305 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2306 if (test_sta_flag(sta,
2307 WLAN_STA_TDLS_PEER_AUTH)) {
97ffe757
JB		 2308 *sta_out = sta;
2309 return 0;
2310 }
2311
2312 /*
2313 * TDLS link during setup - throw out frames to
2314 * peer. Allow TDLS-setup frames to unauthorized
2315 * peers for the special case of a link teardown
2316 * after a TDLS sta is removed due to being
2317 * unreachable.
2318 */
11d62caf 2319 if (!ieee80211_is_tdls_setup(skb))
97ffe757
JB		 2320 return -EINVAL;
2321 }
2322
2323 }
2324
2325 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2326 if (!sta)
2327 return -ENOLINK;
2328 break;
2329 default:
2330 return -EINVAL;
2331 }
2332
2333 *sta_out = sta ?: ERR_PTR(-ENOENT);
2334 return 0;
ad38bfc9
MG		 2335}
2336
e2ebc74d 2337/**
4c9451ed
JB		 2338 * ieee80211_build_hdr - build 802.11 header in the given frame
2339 * @sdata: virtual interface to build the header for
2340 * @skb: the skb to build the header in
24d342c5 2341 * @info_flags: skb flags to set
e2ebc74d 2342 *
4c9451ed
JB		 2343 * This function takes the skb with 802.3 header and reformats the header to
2344 * the appropriate IEEE 802.11 header based on which interface the packet is
2345 * being transmitted on.
2346 *
2347 * Note that this function also takes care of the TX status request and
2348 * potential unsharing of the SKB - this needs to be interleaved with the
2349 * header building.
e2ebc74d 2350 *
4c9451ed
JB		 2351 * The function requires the read-side RCU lock held
2352 *
2353 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
e2ebc74d 2354 */
4c9451ed 2355static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
7c10770f 2356 struct sk_buff *skb, u32 info_flags,
97ffe757 2357 struct sta_info *sta)
e2ebc74d 2358{
133b8226 2359 struct ieee80211_local *local = sdata->local;
489ee919 2360 struct ieee80211_tx_info *info;
dcf33963 2361 int head_need;
065e9605
HH		 2362 u16 ethertype, hdrlen, meshhdrlen = 0;
2363 __le16 fc;
e2ebc74d 2364 struct ieee80211_hdr hdr;
ff67bb86 2365 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 2366 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 2367 const u8 *encaps_data;
2368 int encaps_len, skip_header_bytes;
97ffe757
JB		 2369 bool wme_sta = false, authorized = false;
2370 bool tdls_peer;
a729cff8 2371 bool multicast;
a729cff8 2372 u16 info_id = 0;
55de908a
JB		 2373 struct ieee80211_chanctx_conf *chanctx_conf;
2374 struct ieee80211_sub_if_data *ap_sdata;
57fbcce3 2375 enum nl80211_band band;
4c9451ed 2376 int ret;
e2ebc74d 2377
97ffe757
JB		 2378 if (IS_ERR(sta))
2379 sta = NULL;
2380
e2ebc74d
JB		 2381 /* convert Ethernet header to proper 802.11 header (based on
2382 * operation mode) */
2383 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 2384 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 2385
51fb61e7 2386 switch (sdata->vif.type) {
05c914fe 2387 case NL80211_IFTYPE_AP_VLAN:
97ffe757 2388 if (sdata->wdev.use_4addr) {
f14543ee
FF		 2389 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2390 /* RA TA DA SA */
2391 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 2392 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2393 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2394 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2395 hdrlen = 30;
c2c98fde 2396 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
a74a8c84 2397 wme_sta = sta->sta.wme;
f14543ee 2398 }
55de908a
JB		 2399 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2400 u.ap);
2401 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
4c9451ed
JB		 2402 if (!chanctx_conf) {
2403 ret = -ENOTCONN;
2404 goto free;
2405 }
4bf88530 2406 band = chanctx_conf->def.chan->band;
97ffe757 2407 if (sdata->wdev.use_4addr)
f14543ee
FF		 2408 break;
2409 /* fall through */
2410 case NL80211_IFTYPE_AP:
fe80123d
AB		 2411 if (sdata->vif.type == NL80211_IFTYPE_AP)
2412 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2413 if (!chanctx_conf) {
2414 ret = -ENOTCONN;
2415 goto free;
2416 }
065e9605 2417 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 2418 /* DA BSSID SA */
2419 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 2420 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2421 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2422 hdrlen = 24;
4bf88530 2423 band = chanctx_conf->def.chan->band;
cf966838 2424 break;
05c914fe 2425 case NL80211_IFTYPE_WDS:
065e9605 2426 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 2427 /* RA TA DA SA */
2428 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 2429 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2430 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2431 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2432 hdrlen = 30;
55de908a
JB		 2433 /*
2434 * This is the exception! WDS style interfaces are prohibited
2435 * when channel contexts are in used so this must be valid
2436 */
675a0b04 2437 band = local->hw.conf.chandef.chan->band;
cf966838 2438 break;
33b64eb2 2439#ifdef CONFIG_MAC80211_MESH
05c914fe 2440 case NL80211_IFTYPE_MESH_POINT:
b8bacc18 2441 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 2442 struct sta_info *next_hop;
2443 bool mpp_lookup = true;
2444
bf7cd94d 2445 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 2446 if (mpath) {
2447 mpp_lookup = false;
2448 next_hop = rcu_dereference(mpath->next_hop);
2449 if (!next_hop ||
2450 !(mpath->flags & (MESH_PATH_ACTIVE |
2451 MESH_PATH_RESOLVING)))
2452 mpp_lookup = true;
2453 }
2454
ab1c7906 2455 if (mpp_lookup) {
bf7cd94d 2456 mppath = mpp_path_lookup(sdata, skb->data);
ab1c7906
HR		 2457 if (mppath)
2458 mppath->exp_time = jiffies;
2459 }
163df6cf
CYY		 2460
2461 if (mppath && mpath)
2bdaf386 2462 mesh_path_del(sdata, mpath->dst);
b8bacc18 2463 }
79617dee 2464
f76b57b4 2465 /*
9d52501b
JF		 2466 * Use address extension if it is a packet from
2467 * another interface or if we know the destination
2468 * is being proxied by a portal (i.e. portal address
2469 * differs from proxied address)
f76b57b4 2470 */
b203ca39
JP		 2471 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2472 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 2473 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2474 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 2475 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2476 NULL, NULL);
79617dee 2477 } else {
27f01124
TP		 2478 /* DS -> MBSS (802.11-2012 13.11.3.3).
2479 * For unicast with unknown forwarding information,
2480 * destination might be in the MBSS or if that fails
2481 * forwarded to another mesh gate. In either case
2482 * resolution will be handled in ieee80211_xmit(), so
2483 * leave the original DA. This also works for mcast */
2484 const u8 *mesh_da = skb->data;
2485
2486 if (mppath)
2487 mesh_da = mppath->mpp;
2488 else if (mpath)
2489 mesh_da = mpath->dst;
79617dee 2490
3c5772a5 2491 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 2492 mesh_da, sdata->vif.addr);
27f01124
TP		 2493 if (is_multicast_ether_addr(mesh_da))
2494 /* DA TA mSA AE:SA */
bf7cd94d
JB		 2495 meshhdrlen = ieee80211_new_mesh_header(
2496 sdata, &mesh_hdr,
2497 skb->data + ETH_ALEN, NULL);
3c5772a5 2498 else
27f01124 2499 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 2500 meshhdrlen = ieee80211_new_mesh_header(
2501 sdata, &mesh_hdr, skb->data,
2502 skb->data + ETH_ALEN);
79617dee 2503
79617dee 2504 }
55de908a 2505 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2506 if (!chanctx_conf) {
2507 ret = -ENOTCONN;
2508 goto free;
2509 }
4bf88530 2510 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 2511 break;
2512#endif
05c914fe 2513 case NL80211_IFTYPE_STATION:
97ffe757
JB		 2514 /* we already did checks when looking up the RA STA */
2515 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
941c93cd 2516
97ffe757 2517 if (tdls_peer) {
941c93cd
AN		 2518 /* DA SA BSSID */
2519 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2520 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2521 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2522 hdrlen = 24;
2523 } else if (sdata->u.mgd.use_4addr &&
2524 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2525 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2526 IEEE80211_FCTL_TODS);
f14543ee 2527 /* RA TA DA SA */
941c93cd 2528 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 2529 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2530 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2531 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2532 hdrlen = 30;
2533 } else {
2534 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2535 /* BSSID SA DA */
941c93cd 2536 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 2537 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2538 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2539 hdrlen = 24;
2540 }
55de908a 2541 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2542 if (!chanctx_conf) {
2543 ret = -ENOTCONN;
2544 goto free;
2545 }
4bf88530 2546 band = chanctx_conf->def.chan->band;
cf966838 2547 break;
239281f8
RL		 2548 case NL80211_IFTYPE_OCB:
2549 /* DA SA BSSID */
2550 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2551 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2552 eth_broadcast_addr(hdr.addr3);
2553 hdrlen = 24;
2554 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2555 if (!chanctx_conf) {
2556 ret = -ENOTCONN;
2557 goto free;
2558 }
239281f8
RL		 2559 band = chanctx_conf->def.chan->band;
2560 break;
05c914fe 2561 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 2562 /* DA SA BSSID */
2563 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2564 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 2565 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 2566 hdrlen = 24;
55de908a 2567 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2568 if (!chanctx_conf) {
2569 ret = -ENOTCONN;
2570 goto free;
2571 }
4bf88530 2572 band = chanctx_conf->def.chan->band;
cf966838
JB		 2573 break;
2574 default:
4c9451ed
JB		 2575 ret = -EINVAL;
2576 goto free;
e2ebc74d
JB		 2577 }
2578
a729cff8 2579 multicast = is_multicast_ether_addr(hdr.addr1);
e2ebc74d 2580
97ffe757
JB		 2581 /* sta is always NULL for mesh */
2582 if (sta) {
2583 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2584 wme_sta = sta->sta.wme;
2585 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2586 /* For mesh, the use of the QoS header is mandatory */
c2c98fde 2587 wme_sta = true;
97ffe757 2588 }
4777be41 2589
527871d7
JB		 2590 /* receiver does QoS (which also means we do) use it */
2591 if (wme_sta) {
065e9605 2592 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 2593 hdrlen += 2;
2594 }
2595
2596 /*
238814fd
JB		 2597 * Drop unicast frames to unauthorised stations unless they are
2598 * EAPOL frames from the local station.
ce3edf6d 2599 */
55182e4a 2600 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
239281f8 2601 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
a6ececf4 2602 !multicast && !authorized &&
55182e4a 2603 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 2604 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 2605#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 2606 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
4c9451ed 2607 sdata->name, hdr.addr1);
ce3edf6d
JB		 2608#endif
2609
2610 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2611
4c9451ed
JB		 2612 ret = -EPERM;
2613 goto free;
ce3edf6d
JB		 2614 }
2615
a729cff8
JB		 2616 if (unlikely(!multicast && skb->sk &&
2617 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
bf7fa551 2618 struct sk_buff *ack_skb = skb_clone_sk(skb);
a729cff8 2619
bf7fa551 2620 if (ack_skb) {
a729cff8 2621 unsigned long flags;
9475af6e 2622 int id;
a729cff8
JB		 2623
2624 spin_lock_irqsave(&local->ack_status_lock, flags);
bf7fa551 2625 id = idr_alloc(&local->ack_status_frames, ack_skb,
9475af6e 2626 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2627 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2628
9475af6e 2629 if (id >= 0) {
a729cff8
JB		 2630 info_id = id;
2631 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
a729cff8 2632 } else {
bf7fa551 2633 kfree_skb(ack_skb);
a729cff8 2634 }
a729cff8
JB		 2635 }
2636 }
2637
7e244707
HS		 2638 /*
2639 * If the skb is shared we need to obtain our own copy.
2640 */
2641 if (skb_shared(skb)) {
a729cff8
JB		 2642 struct sk_buff *tmp_skb = skb;
2643
2644 /* can't happen -- skb is a clone if info_id != 0 */
2645 WARN_ON(info_id);
2646
f8a0a781 2647 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2648 kfree_skb(tmp_skb);
2649
4c9451ed
JB		 2650 if (!skb) {
2651 ret = -ENOMEM;
2652 goto free;
2653 }
7e244707
HS		 2654 }
2655
065e9605 2656 hdr.frame_control = fc;
e2ebc74d
JB		 2657 hdr.duration_id = 0;
2658 hdr.seq_ctrl = 0;
2659
2660 skip_header_bytes = ETH_HLEN;
2661 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2662 encaps_data = bridge_tunnel_header;
2663 encaps_len = sizeof(bridge_tunnel_header);
2664 skip_header_bytes -= 2;
e5c5d22e 2665 } else if (ethertype >= ETH_P_802_3_MIN) {
e2ebc74d
JB		 2666 encaps_data = rfc1042_header;
2667 encaps_len = sizeof(rfc1042_header);
2668 skip_header_bytes -= 2;
2669 } else {
2670 encaps_data = NULL;
2671 encaps_len = 0;
2672 }
2673
2674 skb_pull(skb, skip_header_bytes);
23c0752a 2675 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2676
23c0752a
JB		 2677 /*
2678 * So we need to modify the skb header and hence need a copy of
2679 * that. The head_need variable above doesn't, so far, include
2680 * the needed header space that we don't need right away. If we
2681 * can, then we don't reallocate right now but only after the
2682 * frame arrives at the master device (if it does...)
2683 *
2684 * If we cannot, however, then we will reallocate to include all
2685 * the ever needed space. Also, if we need to reallocate it anyway,
2686 * make it big enough for everything we may ever need.
2687 */
e2ebc74d 2688
3a5be7d4 2689 if (head_need > 0 || skb_cloned(skb)) {
2475b1cc 2690 head_need += sdata->encrypt_headroom;
23c0752a
JB		 2691 head_need += local->tx_headroom;
2692 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2693 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2694 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2695 skb = NULL;
4c9451ed 2696 return ERR_PTR(-ENOMEM);
c3e7724b 2697 }
e2ebc74d
JB		 2698 }
2699
eae4430e 2700 if (encaps_data)
e2ebc74d 2701 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
c29b9b9b 2702
e4ab7eb0 2703#ifdef CONFIG_MAC80211_MESH
eae4430e 2704 if (meshhdrlen > 0)
33b64eb2 2705 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
e4ab7eb0 2706#endif
33b64eb2 2707
065e9605 2708 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2709 __le16 *qos_control;
2710
f359d3fe 2711 qos_control = (__le16 *) skb_push(skb, 2);
c29b9b9b
JB		 2712 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2713 /*
2714 * Maybe we could actually set some fields here, for now just
2715 * initialise to zero to indicate no special operation.
2716 */
2717 *qos_control = 0;
2718 } else
2719 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2720
d57a544d 2721 skb_reset_mac_header(skb);
e2ebc74d 2722
489ee919 2723 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2724 memset(info, 0, sizeof(*info));
2725
a729cff8
JB		 2726 info->flags = info_flags;
2727 info->ack_frame_id = info_id;
73c4e195 2728 info->band = band;
a729cff8 2729
4c9451ed
JB		 2730 return skb;
2731 free:
2732 kfree_skb(skb);
2733 return ERR_PTR(ret);
2734}
2735
17c18bf8
JB		 2736/*
2737 * fast-xmit overview
2738 *
2739 * The core idea of this fast-xmit is to remove per-packet checks by checking
2740 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2741 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2742 * much less work can be done per packet. For example, fragmentation must be
2743 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2744 * in the code here.
2745 *
2746 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2747 * header and other data to aid packet processing in ieee80211_xmit_fast().
2748 *
2749 * The most difficult part of this is that when any of these assumptions
2750 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2751 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2752 * since the per-packet code no longer checks the conditions. This is reflected
2753 * by the calls to these functions throughout the rest of the code, and must be
2754 * maintained if any of the TX path checks change.
2755 */
2756
2757void ieee80211_check_fast_xmit(struct sta_info *sta)
2758{
2759 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2760 struct ieee80211_local *local = sta->local;
2761 struct ieee80211_sub_if_data *sdata = sta->sdata;
2762 struct ieee80211_hdr *hdr = (void *)build.hdr;
2763 struct ieee80211_chanctx_conf *chanctx_conf;
2764 __le16 fc;
2765
30686bf7 2766 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
17c18bf8
JB		 2767 return;
2768
2769 /* Locking here protects both the pointer itself, and against concurrent
2770 * invocations winning data access races to, e.g., the key pointer that
2771 * is used.
2772 * Without it, the invocation of this function right after the key
2773 * pointer changes wouldn't be sufficient, as another CPU could access
2774 * the pointer, then stall, and then do the cache update after the CPU
2775 * that invalidated the key.
2776 * With the locking, such scenarios cannot happen as the check for the
2777 * key and the fast-tx assignment are done atomically, so the CPU that
2778 * modifies the key will either wait or other one will see the key
2779 * cleared/changed already.
2780 */
2781 spin_lock_bh(&sta->lock);
30686bf7
JB		 2782 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2783 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
17c18bf8
JB		 2784 sdata->vif.type == NL80211_IFTYPE_STATION)
2785 goto out;
2786
2787 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2788 goto out;
2789
2790 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2791 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
f7418bc1
FF		 2792 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2793 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
17c18bf8
JB		 2794 goto out;
2795
2796 if (sdata->noack_map)
2797 goto out;
2798
2799 /* fast-xmit doesn't handle fragmentation at all */
725b812c 2800 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
f3fe4e93 2801 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
17c18bf8
JB		 2802 goto out;
2803
2804 rcu_read_lock();
2805 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2806 if (!chanctx_conf) {
2807 rcu_read_unlock();
2808 goto out;
2809 }
2810 build.band = chanctx_conf->def.chan->band;
2811 rcu_read_unlock();
2812
2813 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2814
2815 switch (sdata->vif.type) {
3ffd8840
JB		 2816 case NL80211_IFTYPE_ADHOC:
2817 /* DA SA BSSID */
2818 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2819 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2820 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2821 build.hdr_len = 24;
2822 break;
17c18bf8
JB		 2823 case NL80211_IFTYPE_STATION:
2824 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2825 /* DA SA BSSID */
2826 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2827 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2828 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2829 build.hdr_len = 24;
2830 break;
2831 }
2832
2833 if (sdata->u.mgd.use_4addr) {
2834 /* non-regular ethertype cannot use the fastpath */
2835 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2836 IEEE80211_FCTL_TODS);
2837 /* RA TA DA SA */
2838 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2839 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2840 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2841 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2842 build.hdr_len = 30;
2843 break;
2844 }
2845 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2846 /* BSSID SA DA */
2847 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2848 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2849 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2850 build.hdr_len = 24;
2851 break;
2852 case NL80211_IFTYPE_AP_VLAN:
2853 if (sdata->wdev.use_4addr) {
2854 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2855 IEEE80211_FCTL_TODS);
2856 /* RA TA DA SA */
2857 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2858 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2859 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2860 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2861 build.hdr_len = 30;
2862 break;
2863 }
2864 /* fall through */
2865 case NL80211_IFTYPE_AP:
2866 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2867 /* DA BSSID SA */
2868 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2869 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2870 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2871 build.hdr_len = 24;
2872 break;
2873 default:
2874 /* not handled on fast-xmit */
2875 goto out;
2876 }
2877
2878 if (sta->sta.wme) {
2879 build.hdr_len += 2;
2880 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2881 }
2882
2883 /* We store the key here so there's no point in using rcu_dereference()
2884 * but that's fine because the code that changes the pointers will call
2885 * this function after doing so. For a single CPU that would be enough,
2886 * for multiple see the comment above.
2887 */
2888 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2889 if (!build.key)
2890 build.key = rcu_access_pointer(sdata->default_unicast_key);
2891 if (build.key) {
e495c247 2892 bool gen_iv, iv_spc, mmic;
17c18bf8
JB		 2893
2894 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2895 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
e495c247 2896 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
17c18bf8
JB		 2897
2898 /* don't handle software crypto */
2899 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2900 goto out;
2901
2902 switch (build.key->conf.cipher) {
2903 case WLAN_CIPHER_SUITE_CCMP:
2904 case WLAN_CIPHER_SUITE_CCMP_256:
2905 /* add fixed key ID */
2906 if (gen_iv) {
2907 (build.hdr + build.hdr_len)[3] =
2908 0x20 | (build.key->conf.keyidx << 6);
2909 build.pn_offs = build.hdr_len;
2910 }
2911 if (gen_iv || iv_spc)
2912 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2913 break;
2914 case WLAN_CIPHER_SUITE_GCMP:
2915 case WLAN_CIPHER_SUITE_GCMP_256:
2916 /* add fixed key ID */
2917 if (gen_iv) {
2918 (build.hdr + build.hdr_len)[3] =
2919 0x20 | (build.key->conf.keyidx << 6);
2920 build.pn_offs = build.hdr_len;
2921 }
2922 if (gen_iv || iv_spc)
2923 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2924 break;
e495c247
JB		 2925 case WLAN_CIPHER_SUITE_TKIP:
2926 /* cannot handle MMIC or IV generation in xmit-fast */
2927 if (mmic || gen_iv)
2928 goto out;
2929 if (iv_spc)
2930 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2931 break;
2932 case WLAN_CIPHER_SUITE_WEP40:
2933 case WLAN_CIPHER_SUITE_WEP104:
2934 /* cannot handle IV generation in fast-xmit */
2935 if (gen_iv)
2936 goto out;
2937 if (iv_spc)
2938 build.hdr_len += IEEE80211_WEP_IV_LEN;
2939 break;
2940 case WLAN_CIPHER_SUITE_AES_CMAC:
2941 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2942 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2943 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2944 WARN(1,
2945 "management cipher suite 0x%x enabled for data\n",
2946 build.key->conf.cipher);
17c18bf8 2947 goto out;
e495c247
JB		 2948 default:
2949 /* we don't know how to generate IVs for this at all */
2950 if (WARN_ON(gen_iv))
2951 goto out;
2952 /* pure hardware keys are OK, of course */
2953 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2954 break;
2955 /* cipher scheme might require space allocation */
2956 if (iv_spc &&
2957 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2958 goto out;
2959 if (iv_spc)
2960 build.hdr_len += build.key->conf.iv_len;
17c18bf8
JB		 2961 }
2962
2963 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2964 }
2965
2966 hdr->frame_control = fc;
2967
2968 memcpy(build.hdr + build.hdr_len,
2969 rfc1042_header, sizeof(rfc1042_header));
2970 build.hdr_len += sizeof(rfc1042_header);
2971
2972 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2973 /* if the kmemdup fails, continue w/o fast_tx */
2974 if (!fast_tx)
2975 goto out;
2976
2977 out:
2978 /* we might have raced against another call to this function */
2979 old = rcu_dereference_protected(sta->fast_tx,
2980 lockdep_is_held(&sta->lock));
2981 rcu_assign_pointer(sta->fast_tx, fast_tx);
2982 if (old)
2983 kfree_rcu(old, rcu_head);
2984 spin_unlock_bh(&sta->lock);
2985}
2986
2987void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2988{
2989 struct sta_info *sta;
2990
2991 rcu_read_lock();
2992 list_for_each_entry_rcu(sta, &local->sta_list, list)
2993 ieee80211_check_fast_xmit(sta);
2994 rcu_read_unlock();
2995}
2996
2997void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2998{
2999 struct ieee80211_local *local = sdata->local;
3000 struct sta_info *sta;
3001
3002 rcu_read_lock();
3003
3004 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3005 if (sdata != sta->sdata &&
3006 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3007 continue;
3008 ieee80211_check_fast_xmit(sta);
3009 }
3010
3011 rcu_read_unlock();
3012}
3013
3014void ieee80211_clear_fast_xmit(struct sta_info *sta)
3015{
3016 struct ieee80211_fast_tx *fast_tx;
3017
3018 spin_lock_bh(&sta->lock);
3019 fast_tx = rcu_dereference_protected(sta->fast_tx,
3020 lockdep_is_held(&sta->lock));
3021 RCU_INIT_POINTER(sta->fast_tx, NULL);
3022 spin_unlock_bh(&sta->lock);
3023
3024 if (fast_tx)
3025 kfree_rcu(fast_tx, rcu_head);
3026}
3027
6e0456b5
FF		 3028static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3029 struct sk_buff *skb, int headroom,
3030 int *subframe_len)
3031{
3032 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3033 int padding = (4 - amsdu_len) & 3;
3034
3035 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3036 I802_DEBUG_INC(local->tx_expand_skb_head);
3037
3038 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3039 wiphy_debug(local->hw.wiphy,
3040 "failed to reallocate TX buffer\n");
3041 return false;
3042 }
3043 }
3044
3045 if (padding) {
3046 *subframe_len += padding;
b080db58 3047 skb_put_zero(skb, padding);
6e0456b5
FF		 3048 }
3049
3050 return true;
3051}
3052
3053static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3054 struct ieee80211_fast_tx *fast_tx,
3055 struct sk_buff *skb)
3056{
3057 struct ieee80211_local *local = sdata->local;
3058 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3059 struct ieee80211_hdr *hdr;
06f2bb1e 3060 struct ethhdr *amsdu_hdr;
6e0456b5
FF		 3061 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3062 int subframe_len = skb->len - hdr_len;
3063 void *data;
06f2bb1e 3064 u8 *qc, *h_80211_src, *h_80211_dst;
a3e2f4b6 3065 const u8 *bssid;
6e0456b5
FF		 3066
3067 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3068 return false;
3069
3070 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3071 return true;
3072
06f2bb1e 3073 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
6e0456b5
FF		 3074 &subframe_len))
3075 return false;
3076
06f2bb1e
MB		 3077 data = skb_push(skb, sizeof(*amsdu_hdr));
3078 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3079 hdr = data;
3080 amsdu_hdr = data + hdr_len;
3081 /* h_80211_src/dst is addr* field within hdr */
3082 h_80211_src = data + fast_tx->sa_offs;
3083 h_80211_dst = data + fast_tx->da_offs;
6e0456b5 3084
06f2bb1e
MB		 3085 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3086 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3087 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
6e0456b5 3088
a3e2f4b6
MB		 3089 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3090 * fields needs to be changed to BSSID for A-MSDU frames depending
3091 * on FromDS/ToDS values.
3092 */
3093 switch (sdata->vif.type) {
3094 case NL80211_IFTYPE_STATION:
3095 bssid = sdata->u.mgd.bssid;
3096 break;
3097 case NL80211_IFTYPE_AP:
3098 case NL80211_IFTYPE_AP_VLAN:
3099 bssid = sdata->vif.addr;
3100 break;
3101 default:
3102 bssid = NULL;
3103 }
3104
3105 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3106 ether_addr_copy(h_80211_src, bssid);
3107
3108 if (bssid && ieee80211_has_tods(hdr->frame_control))
3109 ether_addr_copy(h_80211_dst, bssid);
3110
6e0456b5
FF		 3111 qc = ieee80211_get_qos_ctl(hdr);
3112 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3113
3114 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3115
3116 return true;
3117}
3118
3119static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3120 struct sta_info *sta,
3121 struct ieee80211_fast_tx *fast_tx,
3122 struct sk_buff *skb)
3123{
3124 struct ieee80211_local *local = sdata->local;
fa962b92
MK		 3125 struct fq *fq = &local->fq;
3126 struct fq_tin *tin;
3127 struct fq_flow *flow;
6e0456b5
FF		 3128 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3129 struct ieee80211_txq *txq = sta->sta.txq[tid];
3130 struct txq_info *txqi;
3131 struct sk_buff **frag_tail, *head;
3132 int subframe_len = skb->len - ETH_ALEN;
3133 u8 max_subframes = sta->sta.max_amsdu_subframes;
3134 int max_frags = local->hw.max_tx_fragments;
3135 int max_amsdu_len = sta->sta.max_amsdu_len;
3136 __be16 len;
3137 void *data;
3138 bool ret = false;
fa962b92 3139 unsigned int orig_len;
6e0456b5
FF		 3140 int n = 1, nfrags;
3141
3142 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3143 return false;
3144
3145 if (!txq)
3146 return false;
3147
3148 txqi = to_txq_info(txq);
3149 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3150 return false;
3151
3152 if (sta->sta.max_rc_amsdu_len)
3153 max_amsdu_len = min_t(int, max_amsdu_len,
3154 sta->sta.max_rc_amsdu_len);
3155
fa962b92 3156 spin_lock_bh(&fq->lock);
6e0456b5 3157
fa962b92
MK		 3158 /* TODO: Ideally aggregation should be done on dequeue to remain
3159 * responsive to environment changes.
3160 */
3161
3162 tin = &txqi->tin;
3163 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3164 head = skb_peek_tail(&flow->queue);
6e0456b5
FF		 3165 if (!head)
3166 goto out;
3167
fa962b92
MK		 3168 orig_len = head->len;
3169
6e0456b5
FF		 3170 if (skb->len + head->len > max_amsdu_len)
3171 goto out;
3172
3173 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3174 goto out;
3175
3176 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3177 nfrags += 1 + skb_shinfo(head)->nr_frags;
3178 frag_tail = &skb_shinfo(head)->frag_list;
3179 while (*frag_tail) {
3180 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3181 frag_tail = &(*frag_tail)->next;
3182 n++;
3183 }
3184
3185 if (max_subframes && n > max_subframes)
3186 goto out;
3187
3188 if (max_frags && nfrags > max_frags)
3189 goto out;
3190
3191 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3192 &subframe_len))
3193 goto out;
3194
3195 ret = true;
3196 data = skb_push(skb, ETH_ALEN + 2);
3197 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3198
3199 data += 2 * ETH_ALEN;
3200 len = cpu_to_be16(subframe_len);
3201 memcpy(data, &len, 2);
3202 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3203
3204 head->len += skb->len;
3205 head->data_len += skb->len;
3206 *frag_tail = skb;
3207
fa962b92
MK		 3208 flow->backlog += head->len - orig_len;
3209 tin->backlog_bytes += head->len - orig_len;
3210
3211 fq_recalc_backlog(fq, tin, flow);
3212
6e0456b5 3213out:
fa962b92 3214 spin_unlock_bh(&fq->lock);
6e0456b5
FF		 3215
3216 return ret;
3217}
3218
bb42f2d1
THJ		 3219/*
3220 * Can be called while the sta lock is held. Anything that can cause packets to
3221 * be generated will cause deadlock!
3222 */
3223static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3224 struct sta_info *sta, u8 pn_offs,
3225 struct ieee80211_key *key,
3226 struct sk_buff *skb)
3227{
3228 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3229 struct ieee80211_hdr *hdr = (void *)skb->data;
3230 u8 tid = IEEE80211_NUM_TIDS;
3231
3232 if (key)
3233 info->control.hw_key = &key->conf;
3234
3235 ieee80211_tx_stats(skb->dev, skb->len);
3236
3237 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3238 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
bb42f2d1
THJ		 3239 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3240 } else {
3241 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3242 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3243 sdata->sequence_number += 0x10;
3244 }
3245
3246 if (skb_shinfo(skb)->gso_size)
3247 sta->tx_stats.msdu[tid] +=
3248 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3249 else
3250 sta->tx_stats.msdu[tid]++;
3251
3252 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3253
3254 /* statistics normally done by ieee80211_tx_h_stats (but that
3255 * has to consider fragmentation, so is more complex)
3256 */
3257 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3258 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3259
3260 if (pn_offs) {
3261 u64 pn;
3262 u8 *crypto_hdr = skb->data + pn_offs;
3263
3264 switch (key->conf.cipher) {
3265 case WLAN_CIPHER_SUITE_CCMP:
3266 case WLAN_CIPHER_SUITE_CCMP_256:
3267 case WLAN_CIPHER_SUITE_GCMP:
3268 case WLAN_CIPHER_SUITE_GCMP_256:
3269 pn = atomic64_inc_return(&key->conf.tx_pn);
3270 crypto_hdr[0] = pn;
3271 crypto_hdr[1] = pn >> 8;
3272 crypto_hdr[4] = pn >> 16;
3273 crypto_hdr[5] = pn >> 24;
3274 crypto_hdr[6] = pn >> 32;
3275 crypto_hdr[7] = pn >> 40;
3276 break;
3277 }
3278 }
3279}
3280
17c18bf8 3281static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
bb42f2d1 3282 struct sta_info *sta,
17c18bf8
JB		 3283 struct ieee80211_fast_tx *fast_tx,
3284 struct sk_buff *skb)
3285{
3286 struct ieee80211_local *local = sdata->local;
3287 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3288 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3289 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3290 struct ethhdr eth;
35f432a0 3291 struct ieee80211_tx_info *info;
17c18bf8
JB		 3292 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3293 struct ieee80211_tx_data tx;
3294 ieee80211_tx_result r;
3295 struct tid_ampdu_tx *tid_tx = NULL;
3296 u8 tid = IEEE80211_NUM_TIDS;
3297
3298 /* control port protocol needs a lot of special handling */
3299 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3300 return false;
3301
3302 /* only RFC 1042 SNAP */
3303 if (ethertype < ETH_P_802_3_MIN)
3304 return false;
3305
3306 /* don't handle TX status request here either */
3307 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3308 return false;
3309
3310 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3311 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3312 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
472be00d
JB		 3313 if (tid_tx) {
3314 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3315 return false;
3316 if (tid_tx->timeout)
3317 tid_tx->last_tx = jiffies;
3318 }
17c18bf8
JB		 3319 }
3320
3321 /* after this point (skb is modified) we cannot return false */
3322
3323 if (skb_shared(skb)) {
3324 struct sk_buff *tmp_skb = skb;
3325
3326 skb = skb_clone(skb, GFP_ATOMIC);
3327 kfree_skb(tmp_skb);
3328
3329 if (!skb)
3330 return true;
3331 }
3332
6e0456b5
FF		 3333 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3334 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3335 return true;
3336
17c18bf8
JB		 3337 /* will not be crypto-handled beyond what we do here, so use false
3338 * as the may-encrypt argument for the resize to not account for
3339 * more room than we already have in 'extra_head'
3340 */
3341 if (unlikely(ieee80211_skb_resize(sdata, skb,
3342 max_t(int, extra_head + hw_headroom -
3343 skb_headroom(skb), 0),
3344 false))) {
3345 kfree_skb(skb);
3346 return true;
3347 }
3348
3349 memcpy(&eth, skb->data, ETH_HLEN - 2);
3350 hdr = (void *)skb_push(skb, extra_head);
3351 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3352 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3353 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3354
35f432a0 3355 info = IEEE80211_SKB_CB(skb);
17c18bf8
JB		 3356 memset(info, 0, sizeof(*info));
3357 info->band = fast_tx->band;
3358 info->control.vif = &sdata->vif;
3359 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3360 IEEE80211_TX_CTL_DONTFRAG |
3361 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
bb42f2d1 3362 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
17c18bf8 3363
a786f96d
FF		 3364 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3365 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3366 *ieee80211_get_qos_ctl(hdr) = tid;
3367 }
3368
17c18bf8
JB		 3369 __skb_queue_head_init(&tx.skbs);
3370
3371 tx.flags = IEEE80211_TX_UNICAST;
3372 tx.local = local;
3373 tx.sdata = sdata;
3374 tx.sta = sta;
3375 tx.key = fast_tx->key;
3376
30686bf7 3377 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
17c18bf8
JB		 3378 tx.skb = skb;
3379 r = ieee80211_tx_h_rate_ctrl(&tx);
3380 skb = tx.skb;
3381 tx.skb = NULL;
3382
3383 if (r != TX_CONTINUE) {
3384 if (r != TX_QUEUED)
3385 kfree_skb(skb);
3386 return true;
3387 }
3388 }
3389
bb42f2d1
THJ		 3390 if (ieee80211_queue_skb(local, sdata, sta, skb))
3391 return true;
17c18bf8 3392
bb42f2d1
THJ		 3393 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3394 fast_tx->key, skb);
17c18bf8
JB		 3395
3396 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3397 sdata = container_of(sdata->bss,
3398 struct ieee80211_sub_if_data, u.ap);
3399
3400 __skb_queue_tail(&tx.skbs, skb);
3401 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3402 return true;
3403}
3404
e0e2efff
THJ		 3405struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3406 struct ieee80211_txq *txq)
3407{
3408 struct ieee80211_local *local = hw_to_local(hw);
3409 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3410 struct ieee80211_hdr *hdr;
3411 struct sk_buff *skb = NULL;
3412 struct fq *fq = &local->fq;
3413 struct fq_tin *tin = &txqi->tin;
bb42f2d1
THJ		 3414 struct ieee80211_tx_info *info;
3415 struct ieee80211_tx_data tx;
3416 ieee80211_tx_result r;
e0e2efff
THJ		 3417
3418 spin_lock_bh(&fq->lock);
3419
3420 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3421 goto out;
3422
bb42f2d1
THJ		 3423 /* Make sure fragments stay together. */
3424 skb = __skb_dequeue(&txqi->frags);
3425 if (skb)
3426 goto out;
3427
3428begin:
e0e2efff
THJ		 3429 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3430 if (!skb)
3431 goto out;
3432
3433 ieee80211_set_skb_vif(skb, txqi);
3434
3435 hdr = (struct ieee80211_hdr *)skb->data;
bb42f2d1
THJ		 3436 info = IEEE80211_SKB_CB(skb);
3437
3438 memset(&tx, 0, sizeof(tx));
3439 __skb_queue_head_init(&tx.skbs);
3440 tx.local = local;
3441 tx.skb = skb;
3442 tx.sdata = vif_to_sdata(info->control.vif);
3443
3444 if (txq->sta)
3445 tx.sta = container_of(txq->sta, struct sta_info, sta);
3446
3447 /*
3448 * The key can be removed while the packet was queued, so need to call
3449 * this here to get the current key.
3450 */
3451 r = ieee80211_tx_h_select_key(&tx);
3452 if (r != TX_CONTINUE) {
3453 ieee80211_free_txskb(&local->hw, skb);
3454 goto begin;
3455 }
3456
c1f4c9ed
FF		 3457 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3458 info->flags |= IEEE80211_TX_CTL_AMPDU;
3459 else
3460 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3461
bb42f2d1 3462 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
e0e2efff
THJ		 3463 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3464 sta);
bb42f2d1 3465 u8 pn_offs = 0;
e0e2efff 3466
bb42f2d1
THJ		 3467 if (tx.key &&
3468 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3469 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3470
3471 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3472 tx.key, skb);
3473 } else {
3474 if (invoke_tx_handlers_late(&tx))
3475 goto begin;
3476
3477 skb = __skb_dequeue(&tx.skbs);
3478
3479 if (!skb_queue_empty(&tx.skbs))
3480 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
e0e2efff
THJ		 3481 }
3482
1e1430d5
JB		 3483 if (skb && skb_has_frag_list(skb) &&
3484 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3485 if (skb_linearize(skb)) {
3486 ieee80211_free_txskb(&local->hw, skb);
3487 goto begin;
3488 }
3489 }
3490
e0e2efff
THJ		 3491out:
3492 spin_unlock_bh(&fq->lock);
3493
e0e2efff
THJ		 3494 return skb;
3495}
3496EXPORT_SYMBOL(ieee80211_tx_dequeue);
3497
4c9451ed
JB		 3498void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3499 struct net_device *dev,
3500 u32 info_flags)
3501{
3502 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
97ffe757 3503 struct sta_info *sta;
80616c0d 3504 struct sk_buff *next;
4c9451ed
JB		 3505
3506 if (unlikely(skb->len < ETH_HLEN)) {
3507 kfree_skb(skb);
3508 return;
3509 }
3510
3511 rcu_read_lock();
e2ebc74d 3512
2d981fdd
JB		 3513 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3514 goto out_free;
4c9451ed 3515
17c18bf8
JB		 3516 if (!IS_ERR_OR_NULL(sta)) {
3517 struct ieee80211_fast_tx *fast_tx;
3518
3519 fast_tx = rcu_dereference(sta->fast_tx);
3520
3521 if (fast_tx &&
bb42f2d1 3522 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
17c18bf8
JB		 3523 goto out;
3524 }
3525
80616c0d
JB		 3526 if (skb_is_gso(skb)) {
3527 struct sk_buff *segs;
680a0dab 3528
80616c0d
JB		 3529 segs = skb_gso_segment(skb, 0);
3530 if (IS_ERR(segs)) {
2d981fdd 3531 goto out_free;
80616c0d
JB		 3532 } else if (segs) {
3533 consume_skb(skb);
3534 skb = segs;
3535 }
3536 } else {
3537 /* we cannot process non-linear frames on this path */
3538 if (skb_linearize(skb)) {
3539 kfree_skb(skb);
3540 goto out;
3541 }
3542
3543 /* the frame could be fragmented, software-encrypted, and other
3544 * things so we cannot really handle checksum offload with it -
3545 * fix it up in software before we handle anything else.
3546 */
3547 if (skb->ip_summed == CHECKSUM_PARTIAL) {
f603f1f3
JB		 3548 skb_set_transport_header(skb,
3549 skb_checksum_start_offset(skb));
80616c0d
JB		 3550 if (skb_checksum_help(skb))
3551 goto out_free;
3552 }
2d981fdd
JB		 3553 }
3554
80616c0d
JB		 3555 next = skb;
3556 while (next) {
3557 skb = next;
3558 next = skb->next;
4c9451ed 3559
80616c0d
JB		 3560 skb->prev = NULL;
3561 skb->next = NULL;
3562
3563 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3564 if (IS_ERR(skb))
3565 goto out;
e2ebc74d 3566
5a490510 3567 ieee80211_tx_stats(dev, skb->len);
80616c0d
JB		 3568
3569 ieee80211_xmit(sdata, sta, skb);
3570 }
2d981fdd
JB		 3571 goto out;
3572 out_free:
3573 kfree_skb(skb);
4c9451ed 3574 out:
55de908a 3575 rcu_read_unlock();
e2ebc74d
JB		 3576}
3577
ebceec86
MB		 3578static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3579{
3580 struct ethhdr *eth;
3581 int err;
3582
3583 err = skb_ensure_writable(skb, ETH_HLEN);
3584 if (unlikely(err))
3585 return err;
3586
3587 eth = (void *)skb->data;
3588 ether_addr_copy(eth->h_dest, sta->sta.addr);
3589
3590 return 0;
3591}
3592
3593static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3594 struct net_device *dev)
3595{
3596 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3597 const struct ethhdr *eth = (void *)skb->data;
3598 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3599 __be16 ethertype;
3600
3601 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3602 return false;
3603
3604 switch (sdata->vif.type) {
3605 case NL80211_IFTYPE_AP_VLAN:
3606 if (sdata->u.vlan.sta)
3607 return false;
3608 if (sdata->wdev.use_4addr)
3609 return false;
3610 /* fall through */
3611 case NL80211_IFTYPE_AP:
3612 /* check runtime toggle for this bss */
3613 if (!sdata->bss->multicast_to_unicast)
3614 return false;
3615 break;
3616 default:
3617 return false;
3618 }
3619
3620 /* multicast to unicast conversion only for some payload */
3621 ethertype = eth->h_proto;
3622 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3623 ethertype = ethvlan->h_vlan_encapsulated_proto;
3624 switch (ethertype) {
3625 case htons(ETH_P_ARP):
3626 case htons(ETH_P_IP):
3627 case htons(ETH_P_IPV6):
3628 break;
3629 default:
3630 return false;
3631 }
3632
3633 return true;
3634}
3635
3636static void
3637ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3638 struct sk_buff_head *queue)
3639{
3640 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3641 struct ieee80211_local *local = sdata->local;
3642 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3643 struct sta_info *sta, *first = NULL;
3644 struct sk_buff *cloned_skb;
3645
3646 rcu_read_lock();
3647
3648 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3649 if (sdata != sta->sdata)
3650 /* AP-VLAN mismatch */
3651 continue;
3652 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3653 /* do not send back to source */
3654 continue;
3655 if (!first) {
3656 first = sta;
3657 continue;
3658 }
3659 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3660 if (!cloned_skb)
3661 goto multicast;
3662 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3663 dev_kfree_skb(cloned_skb);
3664 goto multicast;
3665 }
3666 __skb_queue_tail(queue, cloned_skb);
3667 }
3668
3669 if (likely(first)) {
3670 if (unlikely(ieee80211_change_da(skb, first)))
3671 goto multicast;
3672 __skb_queue_tail(queue, skb);
3673 } else {
3674 /* no STA connected, drop */
3675 kfree_skb(skb);
3676 skb = NULL;
3677 }
3678
3679 goto out;
3680multicast:
3681 __skb_queue_purge(queue);
3682 __skb_queue_tail(queue, skb);
3683out:
3684 rcu_read_unlock();
3685}
3686
4c9451ed
JB		 3687/**
3688 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3689 * @skb: packet to be sent
3690 * @dev: incoming interface
3691 *
3692 * On failure skb will be freed.
3693 */
24d342c5
LK		 3694netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3695 struct net_device *dev)
3696{
ebceec86
MB		 3697 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3698 struct sk_buff_head queue;
3699
3700 __skb_queue_head_init(&queue);
3701 ieee80211_convert_to_unicast(skb, dev, &queue);
3702 while ((skb = __skb_dequeue(&queue)))
3703 __ieee80211_subif_start_xmit(skb, dev, 0);
3704 } else {
3705 __ieee80211_subif_start_xmit(skb, dev, 0);
3706 }
3707
24d342c5
LK		 3708 return NETDEV_TX_OK;
3709}
e2ebc74d 3710
7528ec57
JB		 3711struct sk_buff *
3712ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3713 struct sk_buff *skb, u32 info_flags)
3714{
3715 struct ieee80211_hdr *hdr;
3716 struct ieee80211_tx_data tx = {
3717 .local = sdata->local,
3718 .sdata = sdata,
3719 };
97ffe757 3720 struct sta_info *sta;
7528ec57
JB		 3721
3722 rcu_read_lock();
3723
97ffe757
JB		 3724 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3725 kfree_skb(skb);
3726 skb = ERR_PTR(-EINVAL);
3727 goto out;
3728 }
3729
3730 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
7528ec57
JB		 3731 if (IS_ERR(skb))
3732 goto out;
3733
3734 hdr = (void *)skb->data;
3735 tx.sta = sta_info_get(sdata, hdr->addr1);
3736 tx.skb = skb;
3737
3738 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3739 rcu_read_unlock();
3740 kfree_skb(skb);
3741 return ERR_PTR(-EINVAL);
3742 }
3743
3744out:
3745 rcu_read_unlock();
3746 return skb;
3747}
3748
e2530083
JB		 3749/*
3750 * ieee80211_clear_tx_pending may not be called in a context where
3751 * it is possible that it packets could come in again.
3752 */
e2ebc74d
JB		 3753void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3754{
1f98ab7f 3755 struct sk_buff *skb;
2de8e0d9 3756 int i;
e2ebc74d 3757
1f98ab7f
FF		 3758 for (i = 0; i < local->hw.queues; i++) {
3759 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3760 ieee80211_free_txskb(&local->hw, skb);
3761 }
e2ebc74d
JB		 3762}
3763
7bb45683
JB		 3764/*
3765 * Returns false if the frame couldn't be transmitted but was queued instead,
3766 * which in this case means re-queued -- take as an indication to stop sending
3767 * more pending frames.
3768 */
cd8ffc80
JB		 3769static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3770 struct sk_buff *skb)
3771{
3772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3773 struct ieee80211_sub_if_data *sdata;
3774 struct sta_info *sta;
3775 struct ieee80211_hdr *hdr;
7bb45683 3776 bool result;
55de908a 3777 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 3778
5061b0c2 3779 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 3780
3781 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 3782 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3783 if (unlikely(!chanctx_conf)) {
3784 dev_kfree_skb(skb);
3785 return true;
3786 }
73c4e195 3787 info->band = chanctx_conf->def.chan->band;
7c10770f 3788 result = ieee80211_tx(sdata, NULL, skb, true);
cd8ffc80 3789 } else {
252b86c4
JB		 3790 struct sk_buff_head skbs;
3791
3792 __skb_queue_head_init(&skbs);
3793 __skb_queue_tail(&skbs, skb);
3794
cd8ffc80 3795 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 3796 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 3797
74e4dbfd 3798 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 3799 }
3800
cd8ffc80
JB		 3801 return result;
3802}
3803
e2530083 3804/*
3b8d81e0 3805 * Transmit all pending packets. Called from tasklet.
e2530083 3806 */
e2ebc74d
JB		 3807void ieee80211_tx_pending(unsigned long data)
3808{
3809 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 3810 unsigned long flags;
cd8ffc80 3811 int i;
3b8d81e0 3812 bool txok;
e2ebc74d 3813
f0e72851 3814 rcu_read_lock();
e2530083 3815
3b8d81e0 3816 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 3817 for (i = 0; i < local->hw.queues; i++) {
3818 /*
3819 * If queue is stopped by something other than due to pending
3820 * frames, or we have no pending frames, proceed to next queue.
3821 */
3b8d81e0 3822 if (local->queue_stop_reasons[i] ||
2a577d98 3823 skb_queue_empty(&local->pending[i]))
e2ebc74d 3824 continue;
e2530083 3825
2a577d98 3826 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 3827 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 3828 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 3829
a7bc376c 3830 if (WARN_ON(!info->control.vif)) {
c3e7724b 3831 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 3832 continue;
3833 }
3834
3b8d81e0
JB		 3835 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3836 flags);
3837
3838 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 3839 spin_lock_irqsave(&local->queue_stop_reason_lock,
3840 flags);
3841 if (!txok)
2a577d98 3842 break;
e2ebc74d 3843 }
7236fe29
JB		 3844
3845 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 3846 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 3847 }
3b8d81e0 3848 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 3849
f0e72851 3850 rcu_read_unlock();
e2ebc74d
JB		 3851}
3852
3853/* functions for drivers to get certain frames */
3854
eac70c13 3855static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3856 struct ps_data *ps, struct sk_buff *skb,
3857 bool is_template)
e2ebc74d
JB		 3858{
3859 u8 *pos, *tim;
3860 int aid0 = 0;
3861 int i, have_bits = 0, n1, n2;
3862
3863 /* Generate bitmap for TIM only if there are any STAs in power save
3864 * mode. */
d012a605 3865 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 3866 /* in the hope that this is faster than
3867 * checking byte-for-byte */
f359d3fe 3868 have_bits = !bitmap_empty((unsigned long *)ps->tim,
e2ebc74d 3869 IEEE80211_MAX_AID+1);
6ec8c332
AO		 3870 if (!is_template) {
3871 if (ps->dtim_count == 0)
3872 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3873 else
3874 ps->dtim_count--;
3875 }
e2ebc74d
JB		 3876
3877 tim = pos = (u8 *) skb_put(skb, 6);
3878 *pos++ = WLAN_EID_TIM;
3879 *pos++ = 4;
d012a605 3880 *pos++ = ps->dtim_count;
8860020e 3881 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 3882
d012a605 3883 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 3884 aid0 = 1;
3885
d012a605 3886 ps->dtim_bc_mc = aid0 == 1;
512119b3 3887
e2ebc74d
JB		 3888 if (have_bits) {
3889 /* Find largest even number N1 so that bits numbered 1 through
3890 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3891 * (N2 + 1) x 8 through 2007 are 0. */
3892 n1 = 0;
3893 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 3894 if (ps->tim[i]) {
e2ebc74d
JB		 3895 n1 = i & 0xfe;
3896 break;
3897 }
3898 }
3899 n2 = n1;
3900 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 3901 if (ps->tim[i]) {
e2ebc74d
JB		 3902 n2 = i;
3903 break;
3904 }
3905 }
3906
3907 /* Bitmap control */
3908 *pos++ = n1 | aid0;
3909 /* Part Virt Bitmap */
5220da39 3910 skb_put(skb, n2 - n1);
d012a605 3911 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 3912
3913 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 3914 } else {
3915 *pos++ = aid0; /* Bitmap control */
3916 *pos++ = 0; /* Part Virt Bitmap */
3917 }
e2ebc74d
JB		 3918}
3919
eac70c13 3920static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3921 struct ps_data *ps, struct sk_buff *skb,
3922 bool is_template)
eac70c13
MP		 3923{
3924 struct ieee80211_local *local = sdata->local;
3925
3926 /*
3927 * Not very nice, but we want to allow the driver to call
3928 * ieee80211_beacon_get() as a response to the set_tim()
3929 * callback. That, however, is already invoked under the
3930 * sta_lock to guarantee consistent and race-free update
3931 * of the tim bitmap in mac80211 and the driver.
3932 */
3933 if (local->tim_in_locked_section) {
6ec8c332 3934 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
eac70c13 3935 } else {
1b91731d 3936 spin_lock_bh(&local->tim_lock);
6ec8c332 3937 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
1b91731d 3938 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 3939 }
3940
3941 return 0;
3942}
3943
1af586c9
AO		 3944static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3945 struct beacon_data *beacon)
73da7d5b
SW		 3946{
3947 struct probe_resp *resp;
cd7760e6
SW		 3948 u8 *beacon_data;
3949 size_t beacon_data_len;
0d06d9ba 3950 int i;
af296bdb 3951 u8 count = beacon->csa_current_counter;
cd7760e6
SW		 3952
3953 switch (sdata->vif.type) {
3954 case NL80211_IFTYPE_AP:
3955 beacon_data = beacon->tail;
3956 beacon_data_len = beacon->tail_len;
3957 break;
3958 case NL80211_IFTYPE_ADHOC:
3959 beacon_data = beacon->head;
3960 beacon_data_len = beacon->head_len;
3961 break;
b8456a14
CYY		 3962 case NL80211_IFTYPE_MESH_POINT:
3963 beacon_data = beacon->head;
3964 beacon_data_len = beacon->head_len;
3965 break;
cd7760e6
SW		 3966 default:
3967 return;
3968 }
73da7d5b 3969
af296bdb 3970 rcu_read_lock();
0d06d9ba 3971 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
af296bdb 3972 resp = rcu_dereference(sdata->u.ap.probe_resp);
0d06d9ba 3973
af296bdb
MK		 3974 if (beacon->csa_counter_offsets[i]) {
3975 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3976 beacon_data_len)) {
0d06d9ba
AO		 3977 rcu_read_unlock();
3978 return;
3979 }
af296bdb
MK		 3980
3981 beacon_data[beacon->csa_counter_offsets[i]] = count;
73da7d5b 3982 }
af296bdb
MK		 3983
3984 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3985 resp->data[resp->csa_counter_offsets[i]] = count;
73da7d5b 3986 }
af296bdb 3987 rcu_read_unlock();
1af586c9
AO		 3988}
3989
e996ec2a
WD		 3990static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3991{
3992 beacon->csa_current_counter--;
3993
3994 /* the counter should never reach 0 */
3995 WARN_ON_ONCE(!beacon->csa_current_counter);
3996
3997 return beacon->csa_current_counter;
3998}
3999
1af586c9
AO		 4000u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4001{
4002 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
af296bdb
MK		 4003 struct beacon_data *beacon = NULL;
4004 u8 count = 0;
0d06d9ba 4005
af296bdb
MK		 4006 rcu_read_lock();
4007
4008 if (sdata->vif.type == NL80211_IFTYPE_AP)
4009 beacon = rcu_dereference(sdata->u.ap.beacon);
4010 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4011 beacon = rcu_dereference(sdata->u.ibss.presp);
4012 else if (ieee80211_vif_is_mesh(&sdata->vif))
4013 beacon = rcu_dereference(sdata->u.mesh.beacon);
4014
4015 if (!beacon)
4016 goto unlock;
4017
e996ec2a 4018 count = __ieee80211_csa_update_counter(beacon);
1af586c9 4019
af296bdb
MK		 4020unlock:
4021 rcu_read_unlock();
4022 return count;
73da7d5b 4023}
1af586c9 4024EXPORT_SYMBOL(ieee80211_csa_update_counter);
73da7d5b
SW		 4025
4026bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4027{
4028 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4029 struct beacon_data *beacon = NULL;
4030 u8 *beacon_data;
4031 size_t beacon_data_len;
73da7d5b
SW		 4032 int ret = false;
4033
4034 if (!ieee80211_sdata_running(sdata))
4035 return false;
4036
4037 rcu_read_lock();
4038 if (vif->type == NL80211_IFTYPE_AP) {
4039 struct ieee80211_if_ap *ap = &sdata->u.ap;
4040
4041 beacon = rcu_dereference(ap->beacon);
4042 if (WARN_ON(!beacon || !beacon->tail))
4043 goto out;
4044 beacon_data = beacon->tail;
4045 beacon_data_len = beacon->tail_len;
cd7760e6
SW		 4046 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4047 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4048
4049 beacon = rcu_dereference(ifibss->presp);
4050 if (!beacon)
4051 goto out;
4052
b8456a14
CYY		 4053 beacon_data = beacon->head;
4054 beacon_data_len = beacon->head_len;
4055 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4056 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4057
4058 beacon = rcu_dereference(ifmsh->beacon);
4059 if (!beacon)
4060 goto out;
4061
cd7760e6
SW		 4062 beacon_data = beacon->head;
4063 beacon_data_len = beacon->head_len;
73da7d5b
SW		 4064 } else {
4065 WARN_ON(1);
4066 goto out;
4067 }
4068
10d78f27
MK		 4069 if (!beacon->csa_counter_offsets[0])
4070 goto out;
4071
af296bdb 4072 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
73da7d5b
SW		 4073 goto out;
4074
af296bdb 4075 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
73da7d5b
SW		 4076 ret = true;
4077 out:
4078 rcu_read_unlock();
4079
4080 return ret;
4081}
4082EXPORT_SYMBOL(ieee80211_csa_is_complete);
4083
6ec8c332
AO		 4084static struct sk_buff *
4085__ieee80211_beacon_get(struct ieee80211_hw *hw,
4086 struct ieee80211_vif *vif,
4087 struct ieee80211_mutable_offsets *offs,
4088 bool is_template)
e2ebc74d
JB		 4089{
4090 struct ieee80211_local *local = hw_to_local(hw);
af296bdb 4091 struct beacon_data *beacon = NULL;
9d139c81 4092 struct sk_buff *skb = NULL;
e039fa4a 4093 struct ieee80211_tx_info *info;
e2ebc74d 4094 struct ieee80211_sub_if_data *sdata = NULL;
57fbcce3 4095 enum nl80211_band band;
e00cfce0 4096 struct ieee80211_tx_rate_control txrc;
55de908a 4097 struct ieee80211_chanctx_conf *chanctx_conf;
1af586c9 4098 int csa_off_base = 0;
8318d78a 4099
5dfdaf58 4100 rcu_read_lock();
e2ebc74d 4101
32bfd35d 4102 sdata = vif_to_sdata(vif);
55de908a 4103 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 4104
55de908a 4105 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 4106 goto out;
4107
6ec8c332
AO		 4108 if (offs)
4109 memset(offs, 0, sizeof(*offs));
eddcbb94 4110
05c914fe 4111 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605 4112 struct ieee80211_if_ap *ap = &sdata->u.ap;
d012a605 4113
af296bdb 4114 beacon = rcu_dereference(ap->beacon);
3ad97fbc 4115 if (beacon) {
10d78f27 4116 if (beacon->csa_counter_offsets[0]) {
1af586c9 4117 if (!is_template)
e996ec2a 4118 __ieee80211_csa_update_counter(beacon);
1af586c9
AO		 4119
4120 ieee80211_set_csa(sdata, beacon);
4121 }
73da7d5b 4122
902acc78
JB		 4123 /*
4124 * headroom, head length,
4125 * tail length and maximum TIM length
4126 */
4127 skb = dev_alloc_skb(local->tx_headroom +
4128 beacon->head_len +
70dabeb7
FF		 4129 beacon->tail_len + 256 +
4130 local->hw.extra_beacon_tailroom);
902acc78
JB		 4131 if (!skb)
4132 goto out;
33b64eb2 4133
902acc78 4134 skb_reserve(skb, local->tx_headroom);
59ae1d12 4135 skb_put_data(skb, beacon->head, beacon->head_len);
33b64eb2 4136
6ec8c332
AO		 4137 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4138 is_template);
33b64eb2 4139
6ec8c332
AO		 4140 if (offs) {
4141 offs->tim_offset = beacon->head_len;
4142 offs->tim_length = skb->len - beacon->head_len;
1af586c9
AO		 4143
4144 /* for AP the csa offsets are from tail */
4145 csa_off_base = skb->len;
6ec8c332 4146 }
eddcbb94 4147
902acc78 4148 if (beacon->tail)
59ae1d12
JB		 4149 skb_put_data(skb, beacon->tail,
4150 beacon->tail_len);
9d139c81
JB		 4151 } else
4152 goto out;
05c914fe 4153 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 4154 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 4155 struct ieee80211_hdr *hdr;
33b64eb2 4156
af296bdb
MK		 4157 beacon = rcu_dereference(ifibss->presp);
4158 if (!beacon)
9d139c81
JB		 4159 goto out;
4160
10d78f27 4161 if (beacon->csa_counter_offsets[0]) {
1af586c9 4162 if (!is_template)
e996ec2a 4163 __ieee80211_csa_update_counter(beacon);
cd7760e6 4164
af296bdb 4165 ieee80211_set_csa(sdata, beacon);
1af586c9 4166 }
cd7760e6 4167
af296bdb 4168 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
70dabeb7 4169 local->hw.extra_beacon_tailroom);
9d139c81
JB		 4170 if (!skb)
4171 goto out;
c3ffeab4 4172 skb_reserve(skb, local->tx_headroom);
59ae1d12 4173 skb_put_data(skb, beacon->head, beacon->head_len);
9d139c81
JB		 4174
4175 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 4176 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4177 IEEE80211_STYPE_BEACON);
902acc78 4178 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 4179 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
472dbc45 4180
af296bdb
MK		 4181 beacon = rcu_dereference(ifmsh->beacon);
4182 if (!beacon)
ac1bd846 4183 goto out;
ac1bd846 4184
10d78f27 4185 if (beacon->csa_counter_offsets[0]) {
1af586c9
AO		 4186 if (!is_template)
4187 /* TODO: For mesh csa_counter is in TU, so
4188 * decrementing it by one isn't correct, but
4189 * for now we leave it consistent with overall
4190 * mac80211's behavior.
4191 */
e996ec2a 4192 __ieee80211_csa_update_counter(beacon);
1af586c9 4193
af296bdb 4194 ieee80211_set_csa(sdata, beacon);
1af586c9 4195 }
b8456a14 4196
dbf498fb 4197 if (ifmsh->sync_ops)
445cd452 4198 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
dbf498fb 4199
3b69a9c5 4200 skb = dev_alloc_skb(local->tx_headroom +
af296bdb 4201 beacon->head_len +
3f52b7e3 4202 256 + /* TIM IE */
af296bdb 4203 beacon->tail_len +
70dabeb7 4204 local->hw.extra_beacon_tailroom);
902acc78
JB		 4205 if (!skb)
4206 goto out;
2b5e1967 4207 skb_reserve(skb, local->tx_headroom);
59ae1d12 4208 skb_put_data(skb, beacon->head, beacon->head_len);
6ec8c332
AO		 4209 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4210
4211 if (offs) {
af296bdb
MK		 4212 offs->tim_offset = beacon->head_len;
4213 offs->tim_length = skb->len - beacon->head_len;
6ec8c332
AO		 4214 }
4215
59ae1d12 4216 skb_put_data(skb, beacon->tail, beacon->tail_len);
9d139c81
JB		 4217 } else {
4218 WARN_ON(1);
5dfdaf58 4219 goto out;
e2ebc74d
JB		 4220 }
4221
1af586c9 4222 /* CSA offsets */
af296bdb 4223 if (offs && beacon) {
1af586c9
AO		 4224 int i;
4225
4226 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
af296bdb 4227 u16 csa_off = beacon->csa_counter_offsets[i];
1af586c9
AO		 4228
4229 if (!csa_off)
4230 continue;
4231
4232 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4233 }
4234 }
4235
4bf88530 4236 band = chanctx_conf->def.chan->band;
55de908a 4237
e039fa4a
JB		 4238 info = IEEE80211_SKB_CB(skb);
4239
3b8d81e0 4240 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 4241 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 4242 info->band = band;
e00cfce0
JM		 4243
4244 memset(&txrc, 0, sizeof(txrc));
4245 txrc.hw = hw;
e31583cd 4246 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 4247 txrc.bss_conf = &sdata->vif.bss_conf;
4248 txrc.skb = skb;
4249 txrc.reported_rate.idx = -1;
37eb0b16 4250 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
8f0729b1 4251 txrc.bss = true;
e00cfce0 4252 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 4253
4254 info->control.vif = vif;
f591fa5d 4255
a472e71b
JL		 4256 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4257 IEEE80211_TX_CTL_ASSIGN_SEQ |
4258 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 4259 out:
5dfdaf58 4260 rcu_read_unlock();
e2ebc74d 4261 return skb;
6ec8c332
AO		 4262
4263}
4264
4265struct sk_buff *
4266ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4267 struct ieee80211_vif *vif,
4268 struct ieee80211_mutable_offsets *offs)
4269{
4270 return __ieee80211_beacon_get(hw, vif, offs, true);
4271}
4272EXPORT_SYMBOL(ieee80211_beacon_get_template);
4273
4274struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4275 struct ieee80211_vif *vif,
4276 u16 *tim_offset, u16 *tim_length)
4277{
4278 struct ieee80211_mutable_offsets offs = {};
4279 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
35afa588
HS		 4280 struct sk_buff *copy;
4281 struct ieee80211_supported_band *sband;
4282 int shift;
4283
4284 if (!bcn)
4285 return bcn;
6ec8c332
AO		 4286
4287 if (tim_offset)
4288 *tim_offset = offs.tim_offset;
4289
4290 if (tim_length)
4291 *tim_length = offs.tim_length;
4292
35afa588
HS		 4293 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4294 !hw_to_local(hw)->monitors)
4295 return bcn;
4296
4297 /* send a copy to monitor interfaces */
4298 copy = skb_copy(bcn, GFP_ATOMIC);
4299 if (!copy)
4300 return bcn;
4301
4302 shift = ieee80211_vif_get_shift(vif);
21a8e9dd
MSS		 4303 sband = ieee80211_get_sband(vif_to_sdata(vif));
4304 if (!sband)
4305 return bcn;
4306
35afa588
HS		 4307 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4308
6ec8c332 4309 return bcn;
e2ebc74d 4310}
eddcbb94 4311EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 4312
02945821
AN		 4313struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4314 struct ieee80211_vif *vif)
4315{
4316 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 4317 struct sk_buff *skb = NULL;
4318 struct probe_resp *presp = NULL;
02945821
AN		 4319 struct ieee80211_hdr *hdr;
4320 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4321
4322 if (sdata->vif.type != NL80211_IFTYPE_AP)
4323 return NULL;
4324
4325 rcu_read_lock();
4326
4327 ap = &sdata->u.ap;
4328 presp = rcu_dereference(ap->probe_resp);
4329 if (!presp)
4330 goto out;
4331
aa7a0080 4332 skb = dev_alloc_skb(presp->len);
02945821
AN		 4333 if (!skb)
4334 goto out;
4335
59ae1d12 4336 skb_put_data(skb, presp->data, presp->len);
aa7a0080 4337
02945821
AN		 4338 hdr = (struct ieee80211_hdr *) skb->data;
4339 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4340
4341out:
4342 rcu_read_unlock();
4343 return skb;
4344}
4345EXPORT_SYMBOL(ieee80211_proberesp_get);
4346
7044cc56
KV		 4347struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4348 struct ieee80211_vif *vif)
4349{
4350 struct ieee80211_sub_if_data *sdata;
4351 struct ieee80211_if_managed *ifmgd;
4352 struct ieee80211_pspoll *pspoll;
4353 struct ieee80211_local *local;
4354 struct sk_buff *skb;
4355
4356 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4357 return NULL;
4358
4359 sdata = vif_to_sdata(vif);
4360 ifmgd = &sdata->u.mgd;
4361 local = sdata->local;
4362
4363 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 4364 if (!skb)
7044cc56 4365 return NULL;
d15b8459 4366
7044cc56
KV		 4367 skb_reserve(skb, local->hw.extra_tx_headroom);
4368
b080db58 4369 pspoll = skb_put_zero(skb, sizeof(*pspoll));
7044cc56
KV		 4370 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4371 IEEE80211_STYPE_PSPOLL);
4372 pspoll->aid = cpu_to_le16(ifmgd->aid);
4373
4374 /* aid in PS-Poll has its two MSBs each set to 1 */
4375 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4376
4377 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4378 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4379
4380 return skb;
4381}
4382EXPORT_SYMBOL(ieee80211_pspoll_get);
4383
4384struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4385 struct ieee80211_vif *vif)
4386{
4387 struct ieee80211_hdr_3addr *nullfunc;
4388 struct ieee80211_sub_if_data *sdata;
4389 struct ieee80211_if_managed *ifmgd;
4390 struct ieee80211_local *local;
4391 struct sk_buff *skb;
4392
4393 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4394 return NULL;
4395
4396 sdata = vif_to_sdata(vif);
4397 ifmgd = &sdata->u.mgd;
4398 local = sdata->local;
4399
4400 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 4401 if (!skb)
7044cc56 4402 return NULL;
d15b8459 4403
7044cc56
KV		 4404 skb_reserve(skb, local->hw.extra_tx_headroom);
4405
b080db58 4406 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
7044cc56
KV		 4407 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4408 IEEE80211_STYPE_NULLFUNC |
4409 IEEE80211_FCTL_TODS);
4410 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4411 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4412 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4413
4414 return skb;
4415}
4416EXPORT_SYMBOL(ieee80211_nullfunc_get);
4417
05e54ea6 4418struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
a344d677 4419 const u8 *src_addr,
05e54ea6 4420 const u8 *ssid, size_t ssid_len,
b9a9ada1 4421 size_t tailroom)
05e54ea6 4422{
a344d677 4423 struct ieee80211_local *local = hw_to_local(hw);
05e54ea6
KV		 4424 struct ieee80211_hdr_3addr *hdr;
4425 struct sk_buff *skb;
4426 size_t ie_ssid_len;
4427 u8 *pos;
4428
05e54ea6
KV		 4429 ie_ssid_len = 2 + ssid_len;
4430
4431 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 4432 ie_ssid_len + tailroom);
d15b8459 4433 if (!skb)
05e54ea6 4434 return NULL;
05e54ea6
KV		 4435
4436 skb_reserve(skb, local->hw.extra_tx_headroom);
4437
b080db58 4438 hdr = skb_put_zero(skb, sizeof(*hdr));
05e54ea6
KV		 4439 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4440 IEEE80211_STYPE_PROBE_REQ);
e83e6541 4441 eth_broadcast_addr(hdr->addr1);
a344d677 4442 memcpy(hdr->addr2, src_addr, ETH_ALEN);
e83e6541 4443 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 4444
4445 pos = skb_put(skb, ie_ssid_len);
4446 *pos++ = WLAN_EID_SSID;
4447 *pos++ = ssid_len;
88c868c4 4448 if (ssid_len)
05e54ea6
KV		 4449 memcpy(pos, ssid, ssid_len);
4450 pos += ssid_len;
4451
05e54ea6
KV		 4452 return skb;
4453}
4454EXPORT_SYMBOL(ieee80211_probereq_get);
4455
32bfd35d 4456void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 4457 const void *frame, size_t frame_len,
e039fa4a 4458 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 4459 struct ieee80211_rts *rts)
4460{
4461 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 4462
065e9605
HH		 4463 rts->frame_control =
4464 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 4465 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4466 frame_txctl);
e2ebc74d
JB		 4467 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4468 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4469}
4470EXPORT_SYMBOL(ieee80211_rts_get);
4471
32bfd35d 4472void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 4473 const void *frame, size_t frame_len,
e039fa4a 4474 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 4475 struct ieee80211_cts *cts)
4476{
4477 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 4478
065e9605
HH		 4479 cts->frame_control =
4480 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 4481 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4482 frame_len, frame_txctl);
e2ebc74d
JB		 4483 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4484}
4485EXPORT_SYMBOL(ieee80211_ctstoself_get);
4486
4487struct sk_buff *
32bfd35d 4488ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 4489 struct ieee80211_vif *vif)
e2ebc74d
JB		 4490{
4491 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 4492 struct sk_buff *skb = NULL;
5cf121c3 4493 struct ieee80211_tx_data tx;
e2ebc74d 4494 struct ieee80211_sub_if_data *sdata;
d012a605 4495 struct ps_data *ps;
e039fa4a 4496 struct ieee80211_tx_info *info;
55de908a 4497 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 4498
32bfd35d 4499 sdata = vif_to_sdata(vif);
5dfdaf58 4500
5dfdaf58 4501 rcu_read_lock();
55de908a 4502 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 4503
d012a605
MP		 4504 if (!chanctx_conf)
4505 goto out;
4506
4507 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4508 struct beacon_data *beacon =
4509 rcu_dereference(sdata->u.ap.beacon);
4510
4511 if (!beacon || !beacon->head)
4512 goto out;
4513
4514 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 4515 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4516 ps = &sdata->u.mesh.ps;
d012a605 4517 } else {
747cf5e9 4518 goto out;
d012a605 4519 }
5dfdaf58 4520
d012a605 4521 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 4522 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 4523
e2ebc74d 4524 while (1) {
d012a605 4525 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 4526 if (!skb)
747cf5e9 4527 goto out;
e2ebc74d
JB		 4528 local->total_ps_buffered--;
4529
d012a605 4530 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 4531 struct ieee80211_hdr *hdr =
4532 (struct ieee80211_hdr *) skb->data;
4533 /* more buffered multicast/broadcast frames ==> set
4534 * MoreData flag in IEEE 802.11 header to inform PS
4535 * STAs */
4536 hdr->frame_control |=
4537 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4538 }
4539
112c44b2 4540 if (sdata->vif.type == NL80211_IFTYPE_AP)
7cbf9d01 4541 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
7c10770f 4542 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
e2ebc74d 4543 break;
6b07d9ca 4544 ieee80211_free_txskb(hw, skb);
e2ebc74d 4545 }
e039fa4a
JB		 4546
4547 info = IEEE80211_SKB_CB(skb);
4548
5cf121c3 4549 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 4550 info->band = chanctx_conf->def.chan->band;
e2ebc74d 4551
97b045d6 4552 if (invoke_tx_handlers(&tx))
e2ebc74d 4553 skb = NULL;
97b045d6 4554 out:
d0709a65 4555 rcu_read_unlock();
e2ebc74d
JB		 4556
4557 return skb;
4558}
4559EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 4560
b6da911b
LK		 4561int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4562{
4563 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4564 struct ieee80211_sub_if_data *sdata = sta->sdata;
4565 struct ieee80211_local *local = sdata->local;
4566 int ret;
4567 u32 queues;
4568
4569 lockdep_assert_held(&local->sta_mtx);
4570
4571 /* only some cases are supported right now */
4572 switch (sdata->vif.type) {
4573 case NL80211_IFTYPE_STATION:
4574 case NL80211_IFTYPE_AP:
4575 case NL80211_IFTYPE_AP_VLAN:
4576 break;
4577 default:
4578 WARN_ON(1);
4579 return -EINVAL;
4580 }
4581
4582 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4583 return -EINVAL;
4584
4585 if (sta->reserved_tid == tid) {
4586 ret = 0;
4587 goto out;
4588 }
4589
4590 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4591 sdata_err(sdata, "TID reservation already active\n");
4592 ret = -EALREADY;
4593 goto out;
4594 }
4595
4596 ieee80211_stop_vif_queues(sdata->local, sdata,
4597 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4598
4599 synchronize_net();
4600
4601 /* Tear down BA sessions so we stop aggregating on this TID */
30686bf7 4602 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
b6da911b
LK		 4603 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4604 __ieee80211_stop_tx_ba_session(sta, tid,
4605 AGG_STOP_LOCAL_REQUEST);
4606 }
4607
4608 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3b24f4c6 4609 __ieee80211_flush_queues(local, sdata, queues, false);
b6da911b
LK		 4610
4611 sta->reserved_tid = tid;
4612
4613 ieee80211_wake_vif_queues(local, sdata,
4614 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4615
30686bf7 4616 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
b6da911b
LK		 4617 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4618
4619 ret = 0;
4620 out:
4621 return ret;
4622}
4623EXPORT_SYMBOL(ieee80211_reserve_tid);
4624
4625void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4626{
4627 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4628 struct ieee80211_sub_if_data *sdata = sta->sdata;
4629
4630 lockdep_assert_held(&sdata->local->sta_mtx);
4631
4632 /* only some cases are supported right now */
4633 switch (sdata->vif.type) {
4634 case NL80211_IFTYPE_STATION:
4635 case NL80211_IFTYPE_AP:
4636 case NL80211_IFTYPE_AP_VLAN:
4637 break;
4638 default:
4639 WARN_ON(1);
4640 return;
4641 }
4642
4643 if (tid != sta->reserved_tid) {
4644 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4645 return;
4646 }
4647
4648 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4649}
4650EXPORT_SYMBOL(ieee80211_unreserve_tid);
4651
55de908a
JB		 4652void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4653 struct sk_buff *skb, int tid,
57fbcce3 4654 enum nl80211_band band)
3b8d81e0 4655{
731977e9 4656 int ac = ieee80211_ac_from_tid(tid);
3a25a8c8 4657
d57a544d 4658 skb_reset_mac_header(skb);
3a25a8c8 4659 skb_set_queue_mapping(skb, ac);
cf6bb79a 4660 skb->priority = tid;
cf0277e7 4661
89afe614
JB		 4662 skb->dev = sdata->dev;
4663
3d34deb6
JB		 4664 /*
4665 * The other path calling ieee80211_xmit is from the tasklet,
4666 * and while we can handle concurrent transmissions locking
4667 * requirements are that we do not come into tx with bhs on.
4668 */
4669 local_bh_disable();
73c4e195 4670 IEEE80211_SKB_CB(skb)->band = band;
7c10770f 4671 ieee80211_xmit(sdata, NULL, skb);
3d34deb6 4672 local_bh_enable();
3b8d81e0 4673}
Linux 6.x block layer and io_uring tree(s)