projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
leds: gpio: Support the "panic-indicator" firmware property
[linux-2.6-block.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
e2ebc74d
JB		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 *
13 * Transmit and frame generation functions.
14 */
15
16#include <linux/kernel.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/etherdevice.h>
20#include <linux/bitmap.h>
d4e46a3d 21#include <linux/rcupdate.h>
bc3b2d7f 22#include <linux/export.h>
881d966b 23#include <net/net_namespace.h>
e2ebc74d
JB		 24#include <net/ieee80211_radiotap.h>
25#include <net/cfg80211.h>
26#include <net/mac80211.h>
27#include <asm/unaligned.h>
28
29#include "ieee80211_i.h"
24487981 30#include "driver-ops.h"
2c8dccc7 31#include "led.h"
33b64eb2 32#include "mesh.h"
e2ebc74d
JB		 33#include "wep.h"
34#include "wpa.h"
35#include "wme.h"
2c8dccc7 36#include "rate.h"
e2ebc74d 37
e2ebc74d
JB		 38/* misc utils */
39
5a490510
JB		 40static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
41{
42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
43
44 u64_stats_update_begin(&tstats->syncp);
45 tstats->tx_packets++;
46 tstats->tx_bytes += len;
47 u64_stats_update_end(&tstats->syncp);
48}
49
252b86c4
JB		 50static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
51 struct sk_buff *skb, int group_addr,
03f93c3d 52 int next_frag_len)
e2ebc74d 53{
2103dec1 54 int rate, mrate, erp, dur, i, shift = 0;
2e92e6f2 55 struct ieee80211_rate *txrate;
e2ebc74d 56 struct ieee80211_local *local = tx->local;
8318d78a 57 struct ieee80211_supported_band *sband;
358c8d9d 58 struct ieee80211_hdr *hdr;
252b86c4 59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2103dec1
SW		 60 struct ieee80211_chanctx_conf *chanctx_conf;
61 u32 rate_flags = 0;
62
63 rcu_read_lock();
64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
65 if (chanctx_conf) {
66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
68 }
69 rcu_read_unlock();
e6a9854b
JB		 70
71 /* assume HW handles this */
336004e2 72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
e6a9854b
JB		 73 return 0;
74
75 /* uh huh? */
0d528d85 76 if (WARN_ON_ONCE(tx->rate.idx < 0))
e6a9854b 77 return 0;
e2ebc74d 78
2d56577b 79 sband = local->hw.wiphy->bands[info->band];
0d528d85 80 txrate = &sband->bitrates[tx->rate.idx];
8318d78a 81
e6a9854b 82 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 83
84 /*
85 * data and mgmt (except PS Poll):
86 * - during CFP: 32768
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
93 *
94 * IEEE 802.11, 9.6:
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
99 * BSSBasicRateSet
100 */
252b86c4 101 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 102 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 103 /* TODO: These control frames are not currently sent by
ccd7b362 104 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 105 * needs to be updated to support duration field calculation.
106 *
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
114 * and its SIFS
115 * PS Poll: BIT(15) | BIT(14) | aid
116 */
117 return 0;
118 }
119
120 /* data/mgmt */
121 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 122 return cpu_to_le16(32768);
e2ebc74d
JB		 123
124 if (group_addr) /* Group address as the destination - no ACK */
125 return 0;
126
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
136 */
137 rate = -1;
8318d78a
JB		 138 /* use lowest available if everything fails */
139 mrate = sband->bitrates[0].bitrate;
140 for (i = 0; i < sband->n_bitrates; i++) {
141 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 142
8318d78a
JB		 143 if (r->bitrate > txrate->bitrate)
144 break;
e2ebc74d 145
2103dec1
SW		 146 if ((rate_flags & r->flags) != rate_flags)
147 continue;
148
bda3933a 149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
2103dec1 150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
8318d78a
JB		 151
152 switch (sband->band) {
153 case IEEE80211_BAND_2GHZ: {
154 u32 flag;
155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
156 flag = IEEE80211_RATE_MANDATORY_G;
157 else
158 flag = IEEE80211_RATE_MANDATORY_B;
159 if (r->flags & flag)
160 mrate = r->bitrate;
161 break;
162 }
163 case IEEE80211_BAND_5GHZ:
164 if (r->flags & IEEE80211_RATE_MANDATORY_A)
165 mrate = r->bitrate;
166 break;
3a0c52a6
VK		 167 case IEEE80211_BAND_60GHZ:
168 /* TODO, for now fall through */
8318d78a
JB		 169 case IEEE80211_NUM_BANDS:
170 WARN_ON(1);
171 break;
172 }
e2ebc74d
JB		 173 }
174 if (rate == -1) {
175 /* No matching basic rate found; use highest suitable mandatory
176 * PHY rate */
2103dec1 177 rate = DIV_ROUND_UP(mrate, 1 << shift);
e2ebc74d
JB		 178 }
179
6674f210
SW		 180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr->frame_control) &&
c26a0e10 182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
6674f210
SW		 183 dur = 0;
184 else
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
4ee73f33 188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
438b61b7
SW		 189 tx->sdata->vif.bss_conf.use_short_preamble,
190 shift);
e2ebc74d
JB		 191
192 if (next_frag_len) {
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
196 /* next fragment */
4ee73f33 197 dur += ieee80211_frame_duration(sband->band, next_frag_len,
8318d78a 198 txrate->bitrate, erp,
438b61b7
SW		 199 tx->sdata->vif.bss_conf.use_short_preamble,
200 shift);
e2ebc74d
JB		 201 }
202
03f93c3d 203 return cpu_to_le16(dur);
e2ebc74d
JB		 204}
205
e2ebc74d 206/* tx handlers */
5c1b98a5
KV		 207static ieee80211_tx_result debug_noinline
208ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
209{
210 struct ieee80211_local *local = tx->local;
0c74211d 211 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 212
213 /* driver doesn't support power save */
30686bf7 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
5c1b98a5
KV		 215 return TX_CONTINUE;
216
217 /* hardware does dynamic power save */
30686bf7 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
5c1b98a5
KV		 219 return TX_CONTINUE;
220
221 /* dynamic power save disabled */
222 if (local->hw.conf.dynamic_ps_timeout <= 0)
223 return TX_CONTINUE;
224
225 /* we are scanning, don't enable power save */
226 if (local->scanning)
227 return TX_CONTINUE;
228
229 if (!local->ps_sdata)
230 return TX_CONTINUE;
231
232 /* No point if we're going to suspend */
233 if (local->quiescing)
234 return TX_CONTINUE;
235
0c74211d
KV		 236 /* dynamic ps is supported only in managed mode */
237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
238 return TX_CONTINUE;
239
240 ifmgd = &tx->sdata->u.mgd;
241
242 /*
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
249 * peer application.
250 *
dc41e4d4 251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
0c74211d
KV		 252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
254 */
4875d30d
JB		 255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
0c74211d
KV		 258 return TX_CONTINUE;
259
5c1b98a5
KV		 260 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
261 ieee80211_stop_queues_by_reason(&local->hw,
445ea4e8 262 IEEE80211_MAX_QUEUE_MAP,
cca07b00
LC		 263 IEEE80211_QUEUE_STOP_REASON_PS,
264 false);
db28569a 265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 266 ieee80211_queue_work(&local->hw,
267 &local->dynamic_ps_disable_work);
268 }
269
5db1c07c
LC		 270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd->associated)
272 return TX_CONTINUE;
273
5c1b98a5
KV		 274 mod_timer(&local->dynamic_ps_timer, jiffies +
275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
276
277 return TX_CONTINUE;
278}
e2ebc74d 279
d9e8a70f 280static ieee80211_tx_result debug_noinline
5cf121c3 281ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 282{
358c8d9d 283
e039fa4a 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 286 bool assoc = false;
e2ebc74d 287
e039fa4a 288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 289 return TX_CONTINUE;
58d4185e 290
b23b025f
BG		 291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 293 !ieee80211_is_probe_req(hdr->frame_control) &&
294 !ieee80211_is_nullfunc(hdr->frame_control))
295 /*
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
303 *
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
305 */
9ae54c84 306 return TX_DROP;
e2ebc74d 307
239281f8
RL		 308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
309 return TX_CONTINUE;
310
1be7fe8d
BJ		 311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
312 return TX_CONTINUE;
313
5cf121c3 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 315 return TX_CONTINUE;
e2ebc74d 316
c2c98fde
JB		 317 if (tx->sta)
318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 319
5cf121c3 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 321 if (unlikely(!assoc &&
358c8d9d 322 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d 323#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0
JB		 324 sdata_info(tx->sdata,
325 "dropped data frame to not associated station %pM\n",
326 hdr->addr1);
327#endif
e2ebc74d 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 329 return TX_DROP;
e2ebc74d 330 }
29623892
JB		 331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
332 ieee80211_is_data(hdr->frame_control) &&
030ef8f8 333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
29623892
JB		 334 /*
335 * No associated STAs - no need to send multicast
336 * frames.
337 */
338 return TX_DROP;
e2ebc74d
JB		 339 }
340
9ae54c84 341 return TX_CONTINUE;
e2ebc74d
JB		 342}
343
e2ebc74d
JB		 344/* This function is called whenever the AP is about to exceed the maximum limit
345 * of buffered frames for power saving STAs. This situation should not really
346 * happen often during normal operation, so dropping the oldest buffered packet
347 * from each queue should be OK to make some room for new frames. */
348static void purge_old_ps_buffers(struct ieee80211_local *local)
349{
350 int total = 0, purged = 0;
351 struct sk_buff *skb;
352 struct ieee80211_sub_if_data *sdata;
353 struct sta_info *sta;
354
79010420 355 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
d012a605
MP		 356 struct ps_data *ps;
357
358 if (sdata->vif.type == NL80211_IFTYPE_AP)
359 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 360 else if (ieee80211_vif_is_mesh(&sdata->vif))
361 ps = &sdata->u.mesh.ps;
d012a605 362 else
e2ebc74d 363 continue;
d012a605
MP		 364
365 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d
JB		 366 if (skb) {
367 purged++;
368 dev_kfree_skb(skb);
369 }
d012a605 370 total += skb_queue_len(&ps->bc_buf);
e2ebc74d 371 }
e2ebc74d 372
948d887d
JB		 373 /*
374 * Drop one frame from each station from the lowest-priority
375 * AC that has frames at all.
376 */
d0709a65 377 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 378 int ac;
379
380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
381 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
382 total += skb_queue_len(&sta->ps_tx_buf[ac]);
383 if (skb) {
384 purged++;
c3e7724b 385 ieee80211_free_txskb(&local->hw, skb);
948d887d
JB		 386 break;
387 }
e2ebc74d 388 }
e2ebc74d 389 }
d0709a65 390
e2ebc74d 391 local->total_ps_buffered = total;
bdcbd8e0 392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
e2ebc74d
JB		 393}
394
9ae54c84 395static ieee80211_tx_result
5cf121c3 396ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 397{
e039fa4a 398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d012a605 400 struct ps_data *ps;
e039fa4a 401
7d54d0dd
JB		 402 /*
403 * broadcast/multicast frame
404 *
3f52b7e3 405 * If any of the associated/peer stations is in power save mode,
7d54d0dd
JB		 406 * the frame is buffered to be sent after DTIM beacon frame.
407 * This is done either by the hardware or us.
408 */
409
3f52b7e3 410 /* powersaving STAs currently only in AP/VLAN/mesh mode */
d012a605
MP		 411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
413 if (!tx->sdata->bss)
414 return TX_CONTINUE;
415
416 ps = &tx->sdata->bss->ps;
3f52b7e3
MP		 417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
418 ps = &tx->sdata->u.mesh.ps;
d012a605 419 } else {
3e122be0 420 return TX_CONTINUE;
d012a605
MP		 421 }
422
3e122be0
JB		 423
424 /* no buffering for ordered frames */
358c8d9d 425 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 426 return TX_CONTINUE;
7d54d0dd 427
08b99399
JB		 428 if (ieee80211_is_probe_req(hdr->frame_control))
429 return TX_CONTINUE;
430
30686bf7 431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
f4d57941
JB		 432 info->hw_queue = tx->sdata->vif.cab_queue;
433
7d54d0dd 434 /* no stations in PS mode */
d012a605 435 if (!atomic_read(&ps->num_sta_ps))
9ae54c84 436 return TX_CONTINUE;
7d54d0dd 437
62b517cb 438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
62b1208e 439
62b517cb 440 /* device releases frame after DTIM beacon */
30686bf7 441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
62b1208e 442 return TX_CONTINUE;
62b1208e 443
7d54d0dd 444 /* buffered in mac80211 */
62b1208e
JB		 445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
446 purge_old_ps_buffers(tx->local);
447
d012a605 448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
bdcbd8e0
JB		 449 ps_dbg(tx->sdata,
450 "BC TX buffer full - dropping the oldest frame\n");
d012a605 451 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
62b1208e
JB		 452 } else
453 tx->local->total_ps_buffered++;
e2ebc74d 454
d012a605 455 skb_queue_tail(&ps->bc_buf, tx->skb);
7d54d0dd 456
62b1208e 457 return TX_QUEUED;
e2ebc74d
JB		 458}
459
fb733336
JM		 460static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
461 struct sk_buff *skb)
462{
463 if (!ieee80211_is_mgmt(fc))
464 return 0;
465
c2c98fde 466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 467 return 0;
468
d8ca16db 469 if (!ieee80211_is_robust_mgmt_frame(skb))
fb733336
JM		 470 return 0;
471
472 return 1;
473}
474
9ae54c84 475static ieee80211_tx_result
5cf121c3 476ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 477{
478 struct sta_info *sta = tx->sta;
e039fa4a 479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
08b99399 480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 481 struct ieee80211_local *local = tx->local;
e2ebc74d 482
02f2f1a9 483 if (unlikely(!sta))
9ae54c84 484 return TX_CONTINUE;
e2ebc74d 485
c2c98fde 486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
5ac2e350
JB		 487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
02f2f1a9 489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
948d887d
JB		 490 int ac = skb_get_queue_mapping(tx->skb);
491
08b99399
JB		 492 if (ieee80211_is_mgmt(hdr->frame_control) &&
493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
495 return TX_CONTINUE;
496 }
497
bdcbd8e0
JB		 498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
499 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d
JB		 500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
501 purge_old_ps_buffers(tx->local);
1d147bfa
EG		 502
503 /* sync with ieee80211_sta_ps_deliver_wakeup */
504 spin_lock(&sta->ps_lock);
505 /*
506 * STA woke up the meantime and all the frames on ps_tx_buf have
507 * been queued to pending queue. No reordering can happen, go
508 * ahead and Tx the packet.
509 */
510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
5ac2e350
JB		 511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
1d147bfa
EG		 513 spin_unlock(&sta->ps_lock);
514 return TX_CONTINUE;
515 }
516
948d887d
JB		 517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
bdcbd8e0
JB		 519 ps_dbg(tx->sdata,
520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
521 sta->sta.addr, ac);
c3e7724b 522 ieee80211_free_txskb(&local->hw, old);
e2ebc74d
JB		 523 } else
524 tx->local->total_ps_buffered++;
004c872e 525
e039fa4a 526 info->control.jiffies = jiffies;
5061b0c2 527 info->control.vif = &tx->sdata->vif;
8f77f384 528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
03c8c06f 529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
948d887d 530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
1d147bfa 531 spin_unlock(&sta->ps_lock);
3393a608
JO		 532
533 if (!timer_pending(&local->sta_cleanup))
534 mod_timer(&local->sta_cleanup,
535 round_jiffies(jiffies +
536 STA_INFO_CLEANUP_INTERVAL));
537
c868cb35
JB		 538 /*
539 * We queued up some frames, so the TIM bit might
540 * need to be set, recalculate it.
541 */
542 sta_info_recalc_tim(sta);
543
9ae54c84 544 return TX_QUEUED;
bdcbd8e0
JB		 545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
546 ps_dbg(tx->sdata,
547 "STA %pM in PS mode, but polling/in SP -> send frame\n",
548 sta->sta.addr);
e2ebc74d 549 }
e2ebc74d 550
9ae54c84 551 return TX_CONTINUE;
e2ebc74d
JB		 552}
553
d9e8a70f 554static ieee80211_tx_result debug_noinline
5cf121c3 555ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 556{
5cf121c3 557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 558 return TX_CONTINUE;
e2ebc74d 559
5cf121c3 560 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 561 return ieee80211_tx_h_unicast_ps_buf(tx);
562 else
563 return ieee80211_tx_h_multicast_ps_buf(tx);
564}
565
a621fa4d
JB		 566static ieee80211_tx_result debug_noinline
567ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
568{
569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
570
af61a165
JB		 571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
572 if (tx->sdata->control_port_no_encrypt)
573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
9c1c98a3 575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
af61a165 576 }
a621fa4d
JB		 577
578 return TX_CONTINUE;
579}
580
d9e8a70f 581static ieee80211_tx_result debug_noinline
5cf121c3 582ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 583{
46e6de15 584 struct ieee80211_key *key;
e039fa4a 585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 587
3b8d81e0 588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 589 tx->key = NULL;
2475b1cc
MS		 590 else if (tx->sta &&
591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
d4e46a3d 592 tx->key = key;
3cfcf6ac 593 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324 594 is_multicast_ether_addr(hdr->addr1) &&
d8ca16db 595 ieee80211_is_robust_mgmt_frame(tx->skb) &&
3cfcf6ac
JM		 596 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
597 tx->key = key;
f7e0104c
JB		 598 else if (is_multicast_ether_addr(hdr->addr1) &&
599 (key = rcu_dereference(tx->sdata->default_multicast_key)))
600 tx->key = key;
601 else if (!is_multicast_ether_addr(hdr->addr1) &&
602 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 603 tx->key = key;
e8f4fb7c 604 else
4922f71f 605 tx->key = NULL;
e2ebc74d
JB		 606
607 if (tx->key) {
813d7669
JB		 608 bool skip_hw = false;
609
011bfcc4 610 /* TODO: add threshold stuff again */
176e4f84 611
97359d12
JB		 612 switch (tx->key->conf.cipher) {
613 case WLAN_CIPHER_SUITE_WEP40:
614 case WLAN_CIPHER_SUITE_WEP104:
97359d12 615 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 616 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 617 tx->key = NULL;
618 break;
97359d12 619 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db 620 case WLAN_CIPHER_SUITE_CCMP_256:
00b9cfa3
JM		 621 case WLAN_CIPHER_SUITE_GCMP:
622 case WLAN_CIPHER_SUITE_GCMP_256:
fb733336
JM		 623 if (!ieee80211_is_data_present(hdr->frame_control) &&
624 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
625 tx->skb))
626 tx->key = NULL;
3b43a187
KV		 627 else
628 skip_hw = (tx->key->conf.flags &
e548c49e 629 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 630 ieee80211_is_mgmt(hdr->frame_control);
fb733336 631 break;
97359d12 632 case WLAN_CIPHER_SUITE_AES_CMAC:
56c52da2 633 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
8ade538b
JM		 634 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
635 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3cfcf6ac
JM		 636 if (!ieee80211_is_mgmt(hdr->frame_control))
637 tx->key = NULL;
638 break;
176e4f84 639 }
813d7669 640
e54faf29
JB		 641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
642 !ieee80211_is_deauth(hdr->frame_control)))
95acac61
JB		 643 return TX_DROP;
644
f12553eb 645 if (!skip_hw && tx->key &&
382b1655 646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 647 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 648 }
649
9ae54c84 650 return TX_CONTINUE;
e2ebc74d
JB		 651}
652
d9e8a70f 653static ieee80211_tx_result debug_noinline
5cf121c3 654ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 655{
e039fa4a 656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 657 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
658 struct ieee80211_supported_band *sband;
a2c40249 659 u32 len;
e6a9854b 660 struct ieee80211_tx_rate_control txrc;
0d528d85 661 struct ieee80211_sta_rates *ratetbl = NULL;
c2c98fde 662 bool assoc = false;
8318d78a 663
e6a9854b 664 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 665
2d56577b 666 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 667
a2c40249 668 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 669 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 670
671 /* set up the tx rate control struct we give the RC algo */
005e472b 672 txrc.hw = &tx->local->hw;
e6a9854b
JB		 673 txrc.sband = sband;
674 txrc.bss_conf = &tx->sdata->vif.bss_conf;
675 txrc.skb = tx->skb;
676 txrc.reported_rate.idx = -1;
2d56577b 677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
37eb0b16
JM		 678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
679 txrc.max_rate_idx = -1;
680 else
681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2ffbe6d3
FF		 682
683 if (tx->sdata->rc_has_mcs_mask[info->band])
684 txrc.rate_idx_mcs_mask =
685 tx->sdata->rc_rateidx_mcs_mask[info->band];
686
8f0729b1 687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
5765f9f6
BVB		 689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
690 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
e6a9854b
JB		 691
692 /* set up RTS protection if desired */
b9a5f8ca 693 if (len > tx->local->hw.wiphy->rts_threshold) {
0d528d85 694 txrc.rts = true;
e2ebc74d 695 }
e2ebc74d 696
0d528d85 697 info->control.use_rts = txrc.rts;
991fec09
FF		 698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
699
e6a9854b
JB		 700 /*
701 * Use short preamble if the BSS can handle it, but not for
702 * management frames unless we know the receiver can handle
703 * that -- the management frame might be to a station that
704 * just wants a probe response.
705 */
706 if (tx->sdata->vif.bss_conf.use_short_preamble &&
707 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
0d528d85
FF		 709 txrc.short_preamble = true;
710
711 info->control.short_preamble = txrc.short_preamble;
e2ebc74d 712
dfdfc2be
SE		 713 /* don't ask rate control when rate already injected via radiotap */
714 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
715 return TX_CONTINUE;
716
c2c98fde
JB		 717 if (tx->sta)
718 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 719
720 /*
721 * Lets not bother rate control if we're associated and cannot
722 * talk to the sta. This should not happen.
723 */
c2c98fde 724 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 725 !rate_usable_index_exists(sband, &tx->sta->sta),
726 "%s: Dropped data frame as no usable bitrate found while "
727 "scanning and associated. Target station: "
728 "%pM on %d GHz band\n",
47846c9b 729 tx->sdata->name, hdr->addr1,
2d56577b 730 info->band ? 5 : 2))
b770b43e 731 return TX_DROP;
2e92e6f2 732
b770b43e
LR		 733 /*
734 * If we're associated with the sta at this point we know we can at
735 * least send the frame at the lowest bit rate.
736 */
e6a9854b
JB		 737 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
738
0d528d85
FF		 739 if (tx->sta && !info->control.skip_table)
740 ratetbl = rcu_dereference(tx->sta->sta.rates);
741
742 if (unlikely(info->control.rates[0].idx < 0)) {
743 if (ratetbl) {
744 struct ieee80211_tx_rate rate = {
745 .idx = ratetbl->rate[0].idx,
746 .flags = ratetbl->rate[0].flags,
747 .count = ratetbl->rate[0].count
748 };
749
750 if (ratetbl->rate[0].idx < 0)
751 return TX_DROP;
752
753 tx->rate = rate;
754 } else {
755 return TX_DROP;
756 }
757 } else {
758 tx->rate = info->control.rates[0];
759 }
e6a9854b 760
c1ce5a74 761 if (txrc.reported_rate.idx < 0) {
0d528d85 762 txrc.reported_rate = tx->rate;
c1ce5a74 763 if (tx->sta && ieee80211_is_data(hdr->frame_control))
e5a9f8d0 764 tx->sta->tx_stats.last_rate = txrc.reported_rate;
c1ce5a74 765 } else if (tx->sta)
e5a9f8d0 766 tx->sta->tx_stats.last_rate = txrc.reported_rate;
e039fa4a 767
0d528d85
FF		 768 if (ratetbl)
769 return TX_CONTINUE;
770
e6a9854b
JB		 771 if (unlikely(!info->control.rates[0].count))
772 info->control.rates[0].count = 1;
e2ebc74d 773
9955151d
GS		 774 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
775 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
776 info->control.rates[0].count = 1;
777
e6a9854b
JB		 778 return TX_CONTINUE;
779}
780
ba8c3d6f
FF		 781static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
782{
783 u16 *seq = &sta->tid_seq[tid];
784 __le16 ret = cpu_to_le16(*seq);
785
786 /* Increase the sequence number. */
787 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
788
789 return ret;
790}
791
f591fa5d
JB		 792static ieee80211_tx_result debug_noinline
793ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
794{
795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
f591fa5d
JB		 797 u8 *qc;
798 int tid;
799
25d834e1
JB		 800 /*
801 * Packet injection may want to control the sequence
802 * number, if we have no matching interface then we
803 * neither assign one ourselves nor ask the driver to.
804 */
5061b0c2 805 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 806 return TX_CONTINUE;
807
f591fa5d
JB		 808 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
809 return TX_CONTINUE;
810
811 if (ieee80211_hdrlen(hdr->frame_control) < 24)
812 return TX_CONTINUE;
813
49a59543
JB		 814 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
815 return TX_CONTINUE;
816
94778280
JB		 817 /*
818 * Anything but QoS data that has a sequence number field
819 * (is long enough) gets a sequence number from the global
c4c205f3
BC		 820 * counter. QoS data frames with a multicast destination
821 * also use the global counter (802.11-2012 9.3.2.10).
94778280 822 */
c4c205f3
BC		 823 if (!ieee80211_is_data_qos(hdr->frame_control) ||
824 is_multicast_ether_addr(hdr->addr1)) {
94778280 825 /* driver should assign sequence number */
f591fa5d 826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 827 /* for pure STA mode without beacons, we can do it */
828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
829 tx->sdata->sequence_number += 0x10;
79c892b8 830 if (tx->sta)
e5a9f8d0 831 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
f591fa5d
JB		 832 return TX_CONTINUE;
833 }
834
835 /*
836 * This should be true for injected/management frames only, for
837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
838 * above since they are not QoS-data frames.
839 */
840 if (!tx->sta)
841 return TX_CONTINUE;
842
843 /* include per-STA, per-TID sequence counter */
844
845 qc = ieee80211_get_qos_ctl(hdr);
846 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
e5a9f8d0 847 tx->sta->tx_stats.msdu[tid]++;
f591fa5d 848
ba8c3d6f
FF		 849 if (!tx->sta->sta.txq[0])
850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
f591fa5d
JB		 851
852 return TX_CONTINUE;
853}
854
252b86c4 855static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 856 struct sk_buff *skb, int hdrlen,
857 int frag_threshold)
858{
252b86c4 859 struct ieee80211_local *local = tx->local;
a1a3fcec 860 struct ieee80211_tx_info *info;
252b86c4 861 struct sk_buff *tmp;
2de8e0d9
JB		 862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
865
866 if (WARN_ON(rem < 0))
867 return -EINVAL;
868
252b86c4
JB		 869 /* first fragment was already added to queue by caller */
870
2de8e0d9
JB		 871 while (rem) {
872 int fraglen = per_fragm;
873
874 if (fraglen > rem)
875 fraglen = rem;
876 rem -= fraglen;
877 tmp = dev_alloc_skb(local->tx_headroom +
878 frag_threshold +
2475b1cc 879 tx->sdata->encrypt_headroom +
2de8e0d9
JB		 880 IEEE80211_ENCRYPT_TAILROOM);
881 if (!tmp)
882 return -ENOMEM;
252b86c4
JB		 883
884 __skb_queue_tail(&tx->skbs, tmp);
885
2475b1cc
MS		 886 skb_reserve(tmp,
887 local->tx_headroom + tx->sdata->encrypt_headroom);
888
2de8e0d9
JB		 889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 891
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
895
896 if (rem)
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898
2de8e0d9
JB		 899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
2de8e0d9 901 tmp->dev = skb->dev;
2de8e0d9
JB		 902
903 /* copy header and data */
904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
906
907 pos += fraglen;
908 }
909
252b86c4 910 /* adjust first fragment's length */
338f977f 911 skb_trim(skb, hdrlen + per_fragm);
2de8e0d9
JB		 912 return 0;
913}
914
d9e8a70f 915static ieee80211_tx_result debug_noinline
e2454948
JB		 916ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917{
2de8e0d9
JB		 918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 922 int hdrlen;
923 int fragnum;
e2454948 924
252b86c4
JB		 925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
927 tx->skb = NULL;
928
a26eb27a
JB		 929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930 return TX_CONTINUE;
931
932 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 933 return TX_CONTINUE;
934
eefce91a
JB		 935 /*
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 937 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 938 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 939 */
8b30b1fe 940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 941 return TX_DROP;
942
065e9605 943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 944
a26eb27a 945 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 947 return TX_DROP;
e6a9854b 948
2de8e0d9
JB		 949 /*
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
956 */
252b86c4 957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 958 return TX_DROP;
e6a9854b 959
2de8e0d9
JB		 960 /* update duration/seq/flags of fragments */
961 fragnum = 0;
252b86c4
JB		 962
963 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 965
2de8e0d9
JB		 966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
e6a9854b 968
252b86c4 969 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 970 hdr->frame_control |= morefrags;
e6a9854b
JB		 971 /*
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
974 */
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
e3e1a0bc 978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 980 } else {
981 hdr->frame_control &= ~morefrags;
e6a9854b 982 }
2de8e0d9
JB		 983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
984 fragnum++;
252b86c4 985 }
e2ebc74d 986
9ae54c84 987 return TX_CONTINUE;
e2ebc74d
JB		 988}
989
feff1f2f
JB		 990static ieee80211_tx_result debug_noinline
991ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
992{
252b86c4 993 struct sk_buff *skb;
560d2682 994 int ac = -1;
feff1f2f
JB		 995
996 if (!tx->sta)
997 return TX_CONTINUE;
998
252b86c4 999 skb_queue_walk(&tx->skbs, skb) {
560d2682 1000 ac = skb_get_queue_mapping(skb);
e5a9f8d0 1001 tx->sta->tx_stats.bytes[ac] += skb->len;
252b86c4 1002 }
560d2682 1003 if (ac >= 0)
e5a9f8d0 1004 tx->sta->tx_stats.packets[ac]++;
feff1f2f
JB		 1005
1006 return TX_CONTINUE;
1007}
1008
d9e8a70f 1009static ieee80211_tx_result debug_noinline
e2454948
JB		 1010ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1011{
1012 if (!tx->key)
1013 return TX_CONTINUE;
1014
97359d12
JB		 1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1018 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1019 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1020 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1021 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx, IEEE80211_CCMP_MIC_LEN);
1024 case WLAN_CIPHER_SUITE_CCMP_256:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_256_MIC_LEN);
97359d12 1027 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1028 return ieee80211_crypto_aes_cmac_encrypt(tx);
56c52da2
JM		 1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
8ade538b
JM		 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx);
00b9cfa3
JM		 1034 case WLAN_CIPHER_SUITE_GCMP:
1035 case WLAN_CIPHER_SUITE_GCMP_256:
1036 return ieee80211_crypto_gcmp_encrypt(tx);
3ffc2a90 1037 default:
d32a1028 1038 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1039 }
1040
e2454948
JB		 1041 return TX_DROP;
1042}
1043
d9e8a70f 1044static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1045ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046{
252b86c4 1047 struct sk_buff *skb;
2de8e0d9
JB		 1048 struct ieee80211_hdr *hdr;
1049 int next_len;
1050 bool group_addr;
03f93c3d 1051
252b86c4 1052 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1053 hdr = (void *) skb->data;
7e0aae47
JM		 1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055 break; /* must not overwrite AID */
252b86c4
JB		 1056 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058 next_len = next->len;
1059 } else
1060 next_len = 0;
2de8e0d9 1061 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1062
2de8e0d9 1063 hdr->duration_id =
252b86c4
JB		 1064 ieee80211_duration(tx, skb, group_addr, next_len);
1065 }
03f93c3d
JB		 1066
1067 return TX_CONTINUE;
1068}
1069
e2ebc74d
JB		 1070/* actual transmit path */
1071
a622ab72
JB		 1072static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073 struct sk_buff *skb,
1074 struct ieee80211_tx_info *info,
1075 struct tid_ampdu_tx *tid_tx,
1076 int tid)
1077{
1078 bool queued = false;
285fa695 1079 bool reset_agg_timer = false;
aa454580 1080 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1081
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1084 reset_agg_timer = true;
0ab33703
JB		 1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086 /*
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1089 */
ba8c3d6f 1090 } else if (!tx->sta->sta.txq[tid]) {
a622ab72
JB		 1091 spin_lock(&tx->sta->lock);
1092 /*
1093 * Need to re-check now, because we may get here
1094 *
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1101 *
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1109 */
40b275b6 1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1111
1112 if (!tid_tx) {
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1116 reset_agg_timer = true;
a622ab72
JB		 1117 } else {
1118 queued = true;
1119 info->control.vif = &tx->sdata->vif;
1120 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
e9de0190
MK		 1121 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
1122 IEEE80211_TX_CTL_NO_PS_BUFFER |
1123 IEEE80211_TX_STATUS_EOSP;
a622ab72 1124 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1125 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1126 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1127 }
1128 spin_unlock(&tx->sta->lock);
aa454580
HS		 1129
1130 if (purge_skb)
c3e7724b 1131 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1132 }
1133
285fa695
NM		 1134 /* reset session timer */
1135 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1136 tid_tx->last_tx = jiffies;
285fa695 1137
a622ab72
JB		 1138 return queued;
1139}
1140
58d4185e
JB		 1141/*
1142 * initialises @tx
7c10770f
JB		 1143 * pass %NULL for the station if unknown, a valid pointer if known
1144 * or an ERR_PTR() if the station is known not to exist
58d4185e 1145 */
9ae54c84 1146static ieee80211_tx_result
3b8d81e0
JB		 1147ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1148 struct ieee80211_tx_data *tx,
7c10770f 1149 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1150{
3b8d81e0 1151 struct ieee80211_local *local = sdata->local;
58d4185e 1152 struct ieee80211_hdr *hdr;
e039fa4a 1153 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1154 int tid;
a622ab72 1155 u8 *qc;
e2ebc74d
JB		 1156
1157 memset(tx, 0, sizeof(*tx));
1158 tx->skb = skb;
e2ebc74d 1159 tx->local = local;
3b8d81e0 1160 tx->sdata = sdata;
252b86c4 1161 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1162
cd8ffc80
JB		 1163 /*
1164 * If this flag is set to true anywhere, and we get here,
1165 * we are doing the needed processing, so remove the flag
1166 * now.
1167 */
1168 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1169
58d4185e
JB		 1170 hdr = (struct ieee80211_hdr *) skb->data;
1171
7c10770f
JB		 1172 if (likely(sta)) {
1173 if (!IS_ERR(sta))
1174 tx->sta = sta;
1175 } else {
1176 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1177 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1178 if (!tx->sta && sdata->wdev.use_4addr)
1179 return TX_DROP;
1180 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1181 IEEE80211_TX_CTL_INJECTED) ||
1182 tx->sdata->control_port_protocol == tx->skb->protocol) {
1183 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1184 }
1185 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1186 tx->sta = sta_info_get(sdata, hdr->addr1);
3f0e0b22 1187 }
58d4185e 1188
cd8ffc80 1189 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1190 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
30686bf7
JB		 1191 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1192 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1193 struct tid_ampdu_tx *tid_tx;
1194
8b30b1fe
S		 1195 qc = ieee80211_get_qos_ctl(hdr);
1196 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1197
a622ab72
JB		 1198 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1199 if (tid_tx) {
1200 bool queued;
cd8ffc80 1201
a622ab72
JB		 1202 queued = ieee80211_tx_prep_agg(tx, skb, info,
1203 tid_tx, tid);
1204
1205 if (unlikely(queued))
1206 return TX_QUEUED;
1207 }
8b30b1fe
S		 1208 }
1209
badffb72 1210 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1211 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1212 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1213 } else
5cf121c3 1214 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1215
a26eb27a
JB		 1216 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1217 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1218 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1219 info->flags & IEEE80211_TX_CTL_AMPDU)
1220 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1221 }
1222
e2ebc74d 1223 if (!tx->sta)
e039fa4a 1224 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1 1225 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
e039fa4a 1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1
FF		 1227 ieee80211_check_fast_xmit(tx->sta);
1228 }
58d4185e 1229
e039fa4a 1230 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1231
9ae54c84 1232 return TX_CONTINUE;
e2ebc74d
JB		 1233}
1234
ba8c3d6f
FF		 1235static void ieee80211_drv_tx(struct ieee80211_local *local,
1236 struct ieee80211_vif *vif,
1237 struct ieee80211_sta *pubsta,
1238 struct sk_buff *skb)
1239{
1240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1241 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1243 struct ieee80211_tx_control control = {
1244 .sta = pubsta,
1245 };
1246 struct ieee80211_txq *txq = NULL;
1247 struct txq_info *txqi;
1248 u8 ac;
1249
1250 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1251 goto tx_normal;
1252
1253 if (!ieee80211_is_data(hdr->frame_control))
1254 goto tx_normal;
1255
1256 if (pubsta) {
1257 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1258
1259 txq = pubsta->txq[tid];
1260 } else if (vif) {
1261 txq = vif->txq;
1262 }
1263
1264 if (!txq)
1265 goto tx_normal;
1266
1267 ac = txq->ac;
1268 txqi = to_txq_info(txq);
1269 atomic_inc(&sdata->txqs_len[ac]);
1270 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1271 netif_stop_subqueue(sdata->dev, ac);
1272
f2ac7e30
MK		 1273 spin_lock_bh(&txqi->queue.lock);
1274 txqi->byte_cnt += skb->len;
1275 __skb_queue_tail(&txqi->queue, skb);
1276 spin_unlock_bh(&txqi->queue.lock);
1277
ba8c3d6f
FF		 1278 drv_wake_tx_queue(local, txqi);
1279
1280 return;
1281
1282tx_normal:
1283 drv_tx(local, &control, skb);
1284}
1285
1286struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1287 struct ieee80211_txq *txq)
1288{
1289 struct ieee80211_local *local = hw_to_local(hw);
1290 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1291 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1292 struct ieee80211_hdr *hdr;
1293 struct sk_buff *skb = NULL;
1294 u8 ac = txq->ac;
1295
1296 spin_lock_bh(&txqi->queue.lock);
1297
1298 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1299 goto out;
1300
1301 skb = __skb_dequeue(&txqi->queue);
1302 if (!skb)
1303 goto out;
1304
f2ac7e30
MK		 1305 txqi->byte_cnt -= skb->len;
1306
ba8c3d6f
FF		 1307 atomic_dec(&sdata->txqs_len[ac]);
1308 if (__netif_subqueue_stopped(sdata->dev, ac))
1309 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1310
1311 hdr = (struct ieee80211_hdr *)skb->data;
1312 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1313 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1314 sta);
1315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1316
1317 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1318 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1319 info->flags |= IEEE80211_TX_CTL_AMPDU;
1320 else
1321 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1322 }
1323
1324out:
1325 spin_unlock_bh(&txqi->queue.lock);
1326
1327 return skb;
1328}
1329EXPORT_SYMBOL(ieee80211_tx_dequeue);
1330
11127e91
JB		 1331static bool ieee80211_tx_frags(struct ieee80211_local *local,
1332 struct ieee80211_vif *vif,
1333 struct ieee80211_sta *sta,
1334 struct sk_buff_head *skbs,
1335 bool txpending)
e2ebc74d 1336{
252b86c4 1337 struct sk_buff *skb, *tmp;
3b8d81e0 1338 unsigned long flags;
e2ebc74d 1339
252b86c4 1340 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1341 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1342 int q = info->hw_queue;
1343
1344#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1345 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1346 __skb_unlink(skb, skbs);
c3e7724b 1347 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1348 continue;
1349 }
1350#endif
3b8d81e0
JB		 1351
1352 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1353 if (local->queue_stop_reasons[q] ||
7bb45683 1354 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1355 if (unlikely(info->flags &
a7679ed5
SF		 1356 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1357 if (local->queue_stop_reasons[q] &
1358 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1359 /*
1360 * Drop off-channel frames if queues
1361 * are stopped for any reason other
1362 * than off-channel operation. Never
1363 * queue them.
1364 */
1365 spin_unlock_irqrestore(
1366 &local->queue_stop_reason_lock,
1367 flags);
1368 ieee80211_purge_tx_queue(&local->hw,
1369 skbs);
1370 return true;
1371 }
1372 } else {
1373
6c17b77b 1374 /*
a7679ed5
SF		 1375 * Since queue is stopped, queue up frames for
1376 * later transmission from the tx-pending
1377 * tasklet when the queue is woken again.
6c17b77b 1378 */
a7679ed5
SF		 1379 if (txpending)
1380 skb_queue_splice_init(skbs,
1381 &local->pending[q]);
1382 else
1383 skb_queue_splice_tail_init(skbs,
1384 &local->pending[q]);
1385
1386 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1387 flags);
1388 return false;
6c17b77b 1389 }
7bb45683 1390 }
3b8d81e0 1391 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1392
11127e91 1393 info->control.vif = vif;
f0e72851 1394
11127e91 1395 __skb_unlink(skb, skbs);
ba8c3d6f 1396 ieee80211_drv_tx(local, vif, sta, skb);
11127e91 1397 }
5061b0c2 1398
11127e91
JB		 1399 return true;
1400}
1401
1402/*
1403 * Returns false if the frame couldn't be transmitted but was queued instead.
1404 */
1405static bool __ieee80211_tx(struct ieee80211_local *local,
1406 struct sk_buff_head *skbs, int led_len,
1407 struct sta_info *sta, bool txpending)
1408{
1409 struct ieee80211_tx_info *info;
1410 struct ieee80211_sub_if_data *sdata;
1411 struct ieee80211_vif *vif;
1412 struct ieee80211_sta *pubsta;
1413 struct sk_buff *skb;
1414 bool result = true;
1415 __le16 fc;
5061b0c2 1416
11127e91
JB		 1417 if (WARN_ON(skb_queue_empty(skbs)))
1418 return true;
ec25acc4 1419
11127e91
JB		 1420 skb = skb_peek(skbs);
1421 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1422 info = IEEE80211_SKB_CB(skb);
1423 sdata = vif_to_sdata(info->control.vif);
1424 if (sta && !sta->uploaded)
1425 sta = NULL;
1426
1427 if (sta)
1428 pubsta = &sta->sta;
1429 else
1430 pubsta = NULL;
1431
1432 switch (sdata->vif.type) {
1433 case NL80211_IFTYPE_MONITOR:
c82b5a74
JB		 1434 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1435 vif = &sdata->vif;
1436 break;
1437 }
4b6f1dd6 1438 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1439 if (sdata) {
4b6f1dd6 1440 vif = &sdata->vif;
3a25a8c8
JB		 1441 info->hw_queue =
1442 vif->hw_queue[skb_get_queue_mapping(skb)];
30686bf7 1443 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
63b4d8b3 1444 ieee80211_purge_tx_queue(&local->hw, skbs);
3a25a8c8
JB		 1445 return true;
1446 } else
4b6f1dd6 1447 vif = NULL;
11127e91
JB		 1448 break;
1449 case NL80211_IFTYPE_AP_VLAN:
1450 sdata = container_of(sdata->bss,
1451 struct ieee80211_sub_if_data, u.ap);
1452 /* fall through */
1453 default:
1454 vif = &sdata->vif;
1455 break;
e2ebc74d 1456 }
2de8e0d9 1457
cb831b53
JB		 1458 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1459 txpending);
11127e91 1460
74e4dbfd 1461 ieee80211_tpt_led_trig_tx(local, fc, led_len);
74e4dbfd 1462
4db4e0a1 1463 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1464
11127e91 1465 return result;
e2ebc74d
JB		 1466}
1467
97b045d6
JB		 1468/*
1469 * Invoke TX handlers, return 0 on success and non-zero if the
1470 * frame was dropped or queued.
1471 */
1472static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1473{
252b86c4 1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1475 ieee80211_tx_result res = TX_DROP;
97b045d6 1476
9aa4aee3
JB		 1477#define CALL_TXH(txh) \
1478 do { \
1479 res = txh(tx); \
1480 if (res != TX_CONTINUE) \
1481 goto txh_done; \
1482 } while (0)
1483
5c1b98a5 1484 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1485 CALL_TXH(ieee80211_tx_h_check_assoc);
1486 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1487 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1488 CALL_TXH(ieee80211_tx_h_select_key);
30686bf7 1489 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
af65cd96 1490 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1491
aa5b5492
JB		 1492 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1493 __skb_queue_tail(&tx->skbs, tx->skb);
1494 tx->skb = NULL;
c6fcf6bc 1495 goto txh_done;
aa5b5492 1496 }
c6fcf6bc
JB		 1497
1498 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1499 CALL_TXH(ieee80211_tx_h_sequence);
1500 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1501 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1502 CALL_TXH(ieee80211_tx_h_stats);
1503 CALL_TXH(ieee80211_tx_h_encrypt);
30686bf7 1504 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
8fd369ee 1505 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1506#undef CALL_TXH
97b045d6 1507
d9e8a70f 1508 txh_done:
97b045d6 1509 if (unlikely(res == TX_DROP)) {
5479d0e7 1510 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1511 if (tx->skb)
c3e7724b 1512 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1513 else
1f98ab7f 1514 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1515 return -1;
1516 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1517 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1518 return -1;
1519 }
1520
1521 return 0;
1522}
1523
06be6b14
FF		 1524bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1525 struct ieee80211_vif *vif, struct sk_buff *skb,
1526 int band, struct ieee80211_sta **sta)
1527{
1528 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1530 struct ieee80211_tx_data tx;
88724a81 1531 struct sk_buff *skb2;
06be6b14 1532
7c10770f 1533 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
06be6b14
FF		 1534 return false;
1535
1536 info->band = band;
1537 info->control.vif = vif;
1538 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1539
1540 if (invoke_tx_handlers(&tx))
1541 return false;
1542
1543 if (sta) {
1544 if (tx.sta)
1545 *sta = &tx.sta->sta;
1546 else
1547 *sta = NULL;
1548 }
1549
88724a81
JB		 1550 /* this function isn't suitable for fragmented data frames */
1551 skb2 = __skb_dequeue(&tx.skbs);
1552 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1553 ieee80211_free_txskb(hw, skb2);
1554 ieee80211_purge_tx_queue(hw, &tx.skbs);
1555 return false;
1556 }
1557
06be6b14
FF		 1558 return true;
1559}
1560EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1561
7bb45683
JB		 1562/*
1563 * Returns false if the frame couldn't be transmitted but was queued instead.
1564 */
1565static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
7c10770f
JB		 1566 struct sta_info *sta, struct sk_buff *skb,
1567 bool txpending)
e2ebc74d 1568{
3b8d81e0 1569 struct ieee80211_local *local = sdata->local;
5cf121c3 1570 struct ieee80211_tx_data tx;
97b045d6 1571 ieee80211_tx_result res_prepare;
e039fa4a 1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1573 bool result = true;
74e4dbfd 1574 int led_len;
e2ebc74d 1575
e2ebc74d
JB		 1576 if (unlikely(skb->len < 10)) {
1577 dev_kfree_skb(skb);
7bb45683 1578 return true;
e2ebc74d
JB		 1579 }
1580
58d4185e 1581 /* initialises tx */
74e4dbfd 1582 led_len = skb->len;
7c10770f 1583 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
e2ebc74d 1584
cd8ffc80 1585 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1586 ieee80211_free_txskb(&local->hw, skb);
55de908a 1587 return true;
cd8ffc80 1588 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1589 return true;
e2ebc74d
JB		 1590 }
1591
3a25a8c8
JB		 1592 /* set up hw_queue value early */
1593 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
30686bf7 1594 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3a25a8c8
JB		 1595 info->hw_queue =
1596 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1597
7bb45683 1598 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1599 result = __ieee80211_tx(local, &tx.skbs, led_len,
1600 tx.sta, txpending);
55de908a 1601
7bb45683 1602 return result;
e2ebc74d
JB		 1603}
1604
1605/* device xmit handlers */
1606
3bff1865 1607static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1608 struct sk_buff *skb,
1609 int head_need, bool may_encrypt)
1610{
3bff1865 1611 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1612 int tail_need = 0;
1613
3bff1865 1614 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1615 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1616 tail_need -= skb_tailroom(skb);
1617 tail_need = max_t(int, tail_need, 0);
1618 }
1619
c70f59a2 1620 if (skb_cloned(skb) &&
30686bf7 1621 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
c70f59a2 1622 !skb_clone_writable(skb, ETH_HLEN) ||
17c18bf8 1623 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
23c0752a 1624 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1625 else if (head_need || tail_need)
23c0752a 1626 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1627 else
1628 return 0;
23c0752a
JB		 1629
1630 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1631 wiphy_debug(local->hw.wiphy,
1632 "failed to reallocate TX buffer\n");
23c0752a
JB		 1633 return -ENOMEM;
1634 }
1635
23c0752a
JB		 1636 return 0;
1637}
1638
7c10770f
JB		 1639void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1640 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1641{
3b8d81e0 1642 struct ieee80211_local *local = sdata->local;
e039fa4a 1643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1645 int headroom;
23c0752a 1646 bool may_encrypt;
e2ebc74d 1647
3b8d81e0 1648 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1649
3b8d81e0 1650 headroom = local->tx_headroom;
23c0752a 1651 if (may_encrypt)
2475b1cc 1652 headroom += sdata->encrypt_headroom;
23c0752a
JB		 1653 headroom -= skb_headroom(skb);
1654 headroom = max_t(int, 0, headroom);
1655
3bff1865 1656 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1657 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1658 return;
e2ebc74d
JB		 1659 }
1660
740c1aa3 1661 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1662 info->control.vif = &sdata->vif;
e2ebc74d 1663
3f52b7e3
MP		 1664 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1665 if (ieee80211_is_data(hdr->frame_control) &&
1666 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1667 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1668 return; /* skb queued: don't free */
1669 } else {
1670 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1671 }
98aed9fd 1672 }
cca89496 1673
2154c81c 1674 ieee80211_set_qos_hdr(sdata, skb);
7c10770f 1675 ieee80211_tx(sdata, sta, skb, false);
e2ebc74d
JB		 1676}
1677
dfdfc2be
SE		 1678static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1679 struct sk_buff *skb)
73b9f03a
JB		 1680{
1681 struct ieee80211_radiotap_iterator iterator;
1682 struct ieee80211_radiotap_header *rthdr =
1683 (struct ieee80211_radiotap_header *) skb->data;
1684 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
dfdfc2be
SE		 1685 struct ieee80211_supported_band *sband =
1686 local->hw.wiphy->bands[info->band];
73b9f03a
JB		 1687 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1688 NULL);
1689 u16 txflags;
dfdfc2be
SE		 1690 u16 rate = 0;
1691 bool rate_found = false;
1692 u8 rate_retries = 0;
1693 u16 rate_flags = 0;
1694 u8 mcs_known, mcs_flags;
1695 int i;
73b9f03a
JB		 1696
1697 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1698 IEEE80211_TX_CTL_DONTFRAG;
1699
1700 /*
1701 * for every radiotap entry that is present
1702 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1703 * entries present, or -EINVAL on error)
1704 */
1705
1706 while (!ret) {
1707 ret = ieee80211_radiotap_iterator_next(&iterator);
1708
1709 if (ret)
1710 continue;
1711
1712 /* see if this argument is something we can use */
1713 switch (iterator.this_arg_index) {
1714 /*
1715 * You must take care when dereferencing iterator.this_arg
1716 * for multibyte types... the pointer is not aligned. Use
1717 * get_unaligned((type *)iterator.this_arg) to dereference
1718 * iterator.this_arg for type "type" safely on all arches.
1719 */
1720 case IEEE80211_RADIOTAP_FLAGS:
1721 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1722 /*
1723 * this indicates that the skb we have been
1724 * handed has the 32-bit FCS CRC at the end...
1725 * we should react to that by snipping it off
1726 * because it will be recomputed and added
1727 * on transmission
1728 */
1729 if (skb->len < (iterator._max_length + FCS_LEN))
1730 return false;
1731
1732 skb_trim(skb, skb->len - FCS_LEN);
1733 }
1734 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1735 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1736 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1737 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1738 break;
1739
1740 case IEEE80211_RADIOTAP_TX_FLAGS:
1741 txflags = get_unaligned_le16(iterator.this_arg);
1742 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1743 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1744 break;
1745
dfdfc2be
SE		 1746 case IEEE80211_RADIOTAP_RATE:
1747 rate = *iterator.this_arg;
1748 rate_flags = 0;
1749 rate_found = true;
1750 break;
1751
1752 case IEEE80211_RADIOTAP_DATA_RETRIES:
1753 rate_retries = *iterator.this_arg;
1754 break;
1755
1756 case IEEE80211_RADIOTAP_MCS:
1757 mcs_known = iterator.this_arg[0];
1758 mcs_flags = iterator.this_arg[1];
1759 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
1760 break;
1761
1762 rate_found = true;
1763 rate = iterator.this_arg[2];
1764 rate_flags = IEEE80211_TX_RC_MCS;
1765
1766 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
1767 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
1768 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1769
1770 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
1771 mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40)
1772 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1773 break;
1774
73b9f03a
JB		 1775 /*
1776 * Please update the file
1777 * Documentation/networking/mac80211-injection.txt
1778 * when parsing new fields here.
1779 */
1780
1781 default:
1782 break;
1783 }
1784 }
1785
1786 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1787 return false;
1788
dfdfc2be
SE		 1789 if (rate_found) {
1790 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
1791
1792 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
1793 info->control.rates[i].idx = -1;
1794 info->control.rates[i].flags = 0;
1795 info->control.rates[i].count = 0;
1796 }
1797
1798 if (rate_flags & IEEE80211_TX_RC_MCS) {
1799 info->control.rates[0].idx = rate;
1800 } else {
1801 for (i = 0; i < sband->n_bitrates; i++) {
1802 if (rate * 5 != sband->bitrates[i].bitrate)
1803 continue;
1804
1805 info->control.rates[0].idx = i;
1806 break;
1807 }
1808 }
1809
1810 info->control.rates[0].flags = rate_flags;
1811 info->control.rates[0].count = min_t(u8, rate_retries + 1,
1812 local->hw.max_rate_tries);
1813 }
1814
73b9f03a
JB		 1815 /*
1816 * remove the radiotap header
1817 * iterator->_max_length was sanity-checked against
1818 * skb->len by iterator init
1819 */
1820 skb_pull(skb, iterator._max_length);
1821
1822 return true;
1823}
1824
d0cf9c0d
SH		 1825netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1826 struct net_device *dev)
e2ebc74d
JB		 1827{
1828 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a 1829 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d
JB		 1830 struct ieee80211_radiotap_header *prthdr =
1831 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1832 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1833 struct ieee80211_hdr *hdr;
5d9cf4a5 1834 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
b4932836 1835 struct cfg80211_chan_def *chandef;
9b8a74e3 1836 u16 len_rthdr;
5d9cf4a5 1837 int hdrlen;
e2ebc74d 1838
9b8a74e3
AG		 1839 /* check for not even having the fixed radiotap header part */
1840 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1841 goto fail; /* too short to be possibly valid */
1842
1843 /* is it a header version we can trust to find length from? */
1844 if (unlikely(prthdr->it_version))
1845 goto fail; /* only version 0 is supported */
1846
1847 /* then there must be a radiotap header with a length we can use */
1848 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1849
1850 /* does the skb contain enough to deliver on the alleged length? */
1851 if (unlikely(skb->len < len_rthdr))
1852 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1853
e2ebc74d
JB		 1854 /*
1855 * fix up the pointers accounting for the radiotap
1856 * header still being in there. We are being given
1857 * a precooked IEEE80211 header so no need for
1858 * normal processing
1859 */
9b8a74e3 1860 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1861 /*
9b8a74e3
AG		 1862 * these are just fixed to the end of the rt area since we
1863 * don't have any better information and at this point, nobody cares
e2ebc74d 1864 */
9b8a74e3
AG		 1865 skb_set_network_header(skb, len_rthdr);
1866 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1867
5d9cf4a5
JB		 1868 if (skb->len < len_rthdr + 2)
1869 goto fail;
1870
1871 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1872 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1873
1874 if (skb->len < len_rthdr + hdrlen)
1875 goto fail;
1876
f75f5c6f
HS		 1877 /*
1878 * Initialize skb->protocol if the injected frame is a data frame
1879 * carrying a rfc1042 header
1880 */
5d9cf4a5
JB		 1881 if (ieee80211_is_data(hdr->frame_control) &&
1882 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1883 u8 *payload = (u8 *)hdr + hdrlen;
1884
b203ca39 1885 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1886 skb->protocol = cpu_to_be16((payload[6] << 8) |
1887 payload[7]);
f75f5c6f
HS		 1888 }
1889
3b8d81e0
JB		 1890 memset(info, 0, sizeof(*info));
1891
5d9cf4a5 1892 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1893 IEEE80211_TX_CTL_INJECTED;
1894
5d9cf4a5
JB		 1895 rcu_read_lock();
1896
1897 /*
1898 * We process outgoing injected frames that have a local address
1899 * we handle as though they are non-injected frames.
1900 * This code here isn't entirely correct, the local MAC address
1901 * isn't always enough to find the interface to use; for proper
1902 * VLAN/WDS support we will need a different mechanism (which
1903 * likely isn't going to be monitor interfaces).
1904 */
1905 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1906
1907 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1908 if (!ieee80211_sdata_running(tmp_sdata))
1909 continue;
1910 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1911 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1912 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1913 continue;
b203ca39 1914 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1915 sdata = tmp_sdata;
1916 break;
1917 }
1918 }
7351c6bd 1919
55de908a
JB		 1920 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1921 if (!chanctx_conf) {
1922 tmp_sdata = rcu_dereference(local->monitor_sdata);
1923 if (tmp_sdata)
1924 chanctx_conf =
1925 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1926 }
55de908a 1927
b4a7ff75 1928 if (chanctx_conf)
b4932836 1929 chandef = &chanctx_conf->def;
b4a7ff75 1930 else if (!local->use_chanctx)
b4932836 1931 chandef = &local->_oper_chandef;
b4a7ff75
FF		 1932 else
1933 goto fail_rcu;
55de908a
JB		 1934
1935 /*
1936 * Frame injection is not allowed if beaconing is not allowed
1937 * or if we need radar detection. Beaconing is usually not allowed when
1938 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1939 * Passive scan is also used in world regulatory domains where
1940 * your country is not known and as such it should be treated as
1941 * NO TX unless the channel is explicitly allowed in which case
1942 * your current regulatory domain would not have the passive scan
1943 * flag.
1944 *
1945 * Since AP mode uses monitor interfaces to inject/TX management
1946 * frames we can make AP mode the exception to this rule once it
1947 * supports radar detection as its implementation can deal with
1948 * radar detection by itself. We can do that later by adding a
1949 * monitor flag interfaces used for AP support.
1950 */
b4932836
JD		 1951 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1952 sdata->vif.type))
55de908a
JB		 1953 goto fail_rcu;
1954
73c4e195 1955 info->band = chandef->chan->band;
109843b0
LB		 1956
1957 /* process and remove the injection radiotap header */
1958 if (!ieee80211_parse_tx_radiotap(local, skb))
1959 goto fail_rcu;
1960
7c10770f 1961 ieee80211_xmit(sdata, NULL, skb);
5d9cf4a5
JB		 1962 rcu_read_unlock();
1963
e2ebc74d 1964 return NETDEV_TX_OK;
9b8a74e3 1965
55de908a
JB		 1966fail_rcu:
1967 rcu_read_unlock();
9b8a74e3
AG		 1968fail:
1969 dev_kfree_skb(skb);
1970 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1971}
1972
97ffe757 1973static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
ad38bfc9 1974{
97ffe757 1975 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
ad38bfc9 1976
97ffe757
JB		 1977 return ethertype == ETH_P_TDLS &&
1978 skb->len > 14 &&
1979 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1980}
1981
1982static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1983 struct sk_buff *skb,
1984 struct sta_info **sta_out)
1985{
1986 struct sta_info *sta;
1987
1988 switch (sdata->vif.type) {
1989 case NL80211_IFTYPE_AP_VLAN:
1990 sta = rcu_dereference(sdata->u.vlan.sta);
1991 if (sta) {
1992 *sta_out = sta;
1993 return 0;
1994 } else if (sdata->wdev.use_4addr) {
1995 return -ENOLINK;
1996 }
1997 /* fall through */
1998 case NL80211_IFTYPE_AP:
1999 case NL80211_IFTYPE_OCB:
2000 case NL80211_IFTYPE_ADHOC:
2001 if (is_multicast_ether_addr(skb->data)) {
2002 *sta_out = ERR_PTR(-ENOENT);
2003 return 0;
2004 }
2005 sta = sta_info_get_bss(sdata, skb->data);
2006 break;
2007 case NL80211_IFTYPE_WDS:
2008 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2009 break;
2010#ifdef CONFIG_MAC80211_MESH
2011 case NL80211_IFTYPE_MESH_POINT:
2012 /* determined much later */
2013 *sta_out = NULL;
2014 return 0;
2015#endif
2016 case NL80211_IFTYPE_STATION:
2017 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2018 sta = sta_info_get(sdata, skb->data);
2019 if (sta) {
2020 bool tdls_peer, tdls_auth;
2021
2022 tdls_peer = test_sta_flag(sta,
2023 WLAN_STA_TDLS_PEER);
2024 tdls_auth = test_sta_flag(sta,
2025 WLAN_STA_TDLS_PEER_AUTH);
2026
2027 if (tdls_peer && tdls_auth) {
2028 *sta_out = sta;
2029 return 0;
2030 }
2031
2032 /*
2033 * TDLS link during setup - throw out frames to
2034 * peer. Allow TDLS-setup frames to unauthorized
2035 * peers for the special case of a link teardown
2036 * after a TDLS sta is removed due to being
2037 * unreachable.
2038 */
2039 if (tdls_peer && !tdls_auth &&
2040 !ieee80211_is_tdls_setup(skb))
2041 return -EINVAL;
2042 }
2043
2044 }
2045
2046 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2047 if (!sta)
2048 return -ENOLINK;
2049 break;
2050 default:
2051 return -EINVAL;
2052 }
2053
2054 *sta_out = sta ?: ERR_PTR(-ENOENT);
2055 return 0;
ad38bfc9
MG		 2056}
2057
e2ebc74d 2058/**
4c9451ed
JB		 2059 * ieee80211_build_hdr - build 802.11 header in the given frame
2060 * @sdata: virtual interface to build the header for
2061 * @skb: the skb to build the header in
24d342c5 2062 * @info_flags: skb flags to set
e2ebc74d 2063 *
4c9451ed
JB		 2064 * This function takes the skb with 802.3 header and reformats the header to
2065 * the appropriate IEEE 802.11 header based on which interface the packet is
2066 * being transmitted on.
2067 *
2068 * Note that this function also takes care of the TX status request and
2069 * potential unsharing of the SKB - this needs to be interleaved with the
2070 * header building.
e2ebc74d 2071 *
4c9451ed
JB		 2072 * The function requires the read-side RCU lock held
2073 *
2074 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
e2ebc74d 2075 */
4c9451ed 2076static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
7c10770f 2077 struct sk_buff *skb, u32 info_flags,
97ffe757 2078 struct sta_info *sta)
e2ebc74d 2079{
133b8226 2080 struct ieee80211_local *local = sdata->local;
489ee919 2081 struct ieee80211_tx_info *info;
dcf33963 2082 int head_need;
065e9605
HH		 2083 u16 ethertype, hdrlen, meshhdrlen = 0;
2084 __le16 fc;
e2ebc74d 2085 struct ieee80211_hdr hdr;
ff67bb86 2086 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 2087 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 2088 const u8 *encaps_data;
2089 int encaps_len, skip_header_bytes;
e8bf9649 2090 int nh_pos, h_pos;
97ffe757
JB		 2091 bool wme_sta = false, authorized = false;
2092 bool tdls_peer;
a729cff8 2093 bool multicast;
a729cff8 2094 u16 info_id = 0;
55de908a
JB		 2095 struct ieee80211_chanctx_conf *chanctx_conf;
2096 struct ieee80211_sub_if_data *ap_sdata;
2097 enum ieee80211_band band;
4c9451ed 2098 int ret;
e2ebc74d 2099
97ffe757
JB		 2100 if (IS_ERR(sta))
2101 sta = NULL;
2102
e2ebc74d
JB		 2103 /* convert Ethernet header to proper 802.11 header (based on
2104 * operation mode) */
2105 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 2106 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 2107
51fb61e7 2108 switch (sdata->vif.type) {
05c914fe 2109 case NL80211_IFTYPE_AP_VLAN:
97ffe757 2110 if (sdata->wdev.use_4addr) {
f14543ee
FF		 2111 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2112 /* RA TA DA SA */
2113 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 2114 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2115 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2116 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2117 hdrlen = 30;
c2c98fde 2118 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
a74a8c84 2119 wme_sta = sta->sta.wme;
f14543ee 2120 }
55de908a
JB		 2121 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2122 u.ap);
2123 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
4c9451ed
JB		 2124 if (!chanctx_conf) {
2125 ret = -ENOTCONN;
2126 goto free;
2127 }
4bf88530 2128 band = chanctx_conf->def.chan->band;
97ffe757 2129 if (sdata->wdev.use_4addr)
f14543ee
FF		 2130 break;
2131 /* fall through */
2132 case NL80211_IFTYPE_AP:
fe80123d
AB		 2133 if (sdata->vif.type == NL80211_IFTYPE_AP)
2134 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2135 if (!chanctx_conf) {
2136 ret = -ENOTCONN;
2137 goto free;
2138 }
065e9605 2139 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 2140 /* DA BSSID SA */
2141 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 2142 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2143 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2144 hdrlen = 24;
4bf88530 2145 band = chanctx_conf->def.chan->band;
cf966838 2146 break;
05c914fe 2147 case NL80211_IFTYPE_WDS:
065e9605 2148 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 2149 /* RA TA DA SA */
2150 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 2151 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2152 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2153 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2154 hdrlen = 30;
55de908a
JB		 2155 /*
2156 * This is the exception! WDS style interfaces are prohibited
2157 * when channel contexts are in used so this must be valid
2158 */
675a0b04 2159 band = local->hw.conf.chandef.chan->band;
cf966838 2160 break;
33b64eb2 2161#ifdef CONFIG_MAC80211_MESH
05c914fe 2162 case NL80211_IFTYPE_MESH_POINT:
b8bacc18 2163 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 2164 struct sta_info *next_hop;
2165 bool mpp_lookup = true;
2166
bf7cd94d 2167 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 2168 if (mpath) {
2169 mpp_lookup = false;
2170 next_hop = rcu_dereference(mpath->next_hop);
2171 if (!next_hop ||
2172 !(mpath->flags & (MESH_PATH_ACTIVE |
2173 MESH_PATH_RESOLVING)))
2174 mpp_lookup = true;
2175 }
2176
ab1c7906 2177 if (mpp_lookup) {
bf7cd94d 2178 mppath = mpp_path_lookup(sdata, skb->data);
ab1c7906
HR		 2179 if (mppath)
2180 mppath->exp_time = jiffies;
2181 }
163df6cf
CYY		 2182
2183 if (mppath && mpath)
2184 mesh_path_del(mpath->sdata, mpath->dst);
b8bacc18 2185 }
79617dee 2186
f76b57b4 2187 /*
9d52501b
JF		 2188 * Use address extension if it is a packet from
2189 * another interface or if we know the destination
2190 * is being proxied by a portal (i.e. portal address
2191 * differs from proxied address)
f76b57b4 2192 */
b203ca39
JP		 2193 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2194 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 2195 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2196 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 2197 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2198 NULL, NULL);
79617dee 2199 } else {
27f01124
TP		 2200 /* DS -> MBSS (802.11-2012 13.11.3.3).
2201 * For unicast with unknown forwarding information,
2202 * destination might be in the MBSS or if that fails
2203 * forwarded to another mesh gate. In either case
2204 * resolution will be handled in ieee80211_xmit(), so
2205 * leave the original DA. This also works for mcast */
2206 const u8 *mesh_da = skb->data;
2207
2208 if (mppath)
2209 mesh_da = mppath->mpp;
2210 else if (mpath)
2211 mesh_da = mpath->dst;
79617dee 2212
3c5772a5 2213 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 2214 mesh_da, sdata->vif.addr);
27f01124
TP		 2215 if (is_multicast_ether_addr(mesh_da))
2216 /* DA TA mSA AE:SA */
bf7cd94d
JB		 2217 meshhdrlen = ieee80211_new_mesh_header(
2218 sdata, &mesh_hdr,
2219 skb->data + ETH_ALEN, NULL);
3c5772a5 2220 else
27f01124 2221 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 2222 meshhdrlen = ieee80211_new_mesh_header(
2223 sdata, &mesh_hdr, skb->data,
2224 skb->data + ETH_ALEN);
79617dee 2225
79617dee 2226 }
55de908a 2227 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2228 if (!chanctx_conf) {
2229 ret = -ENOTCONN;
2230 goto free;
2231 }
4bf88530 2232 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 2233 break;
2234#endif
05c914fe 2235 case NL80211_IFTYPE_STATION:
97ffe757
JB		 2236 /* we already did checks when looking up the RA STA */
2237 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
941c93cd 2238
97ffe757 2239 if (tdls_peer) {
941c93cd
AN		 2240 /* DA SA BSSID */
2241 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2242 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2243 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2244 hdrlen = 24;
2245 } else if (sdata->u.mgd.use_4addr &&
2246 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2247 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2248 IEEE80211_FCTL_TODS);
f14543ee 2249 /* RA TA DA SA */
941c93cd 2250 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 2251 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2252 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2253 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2254 hdrlen = 30;
2255 } else {
2256 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2257 /* BSSID SA DA */
941c93cd 2258 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 2259 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2260 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2261 hdrlen = 24;
2262 }
55de908a 2263 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2264 if (!chanctx_conf) {
2265 ret = -ENOTCONN;
2266 goto free;
2267 }
4bf88530 2268 band = chanctx_conf->def.chan->band;
cf966838 2269 break;
239281f8
RL		 2270 case NL80211_IFTYPE_OCB:
2271 /* DA SA BSSID */
2272 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2273 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2274 eth_broadcast_addr(hdr.addr3);
2275 hdrlen = 24;
2276 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2277 if (!chanctx_conf) {
2278 ret = -ENOTCONN;
2279 goto free;
2280 }
239281f8
RL		 2281 band = chanctx_conf->def.chan->band;
2282 break;
05c914fe 2283 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 2284 /* DA SA BSSID */
2285 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2286 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 2287 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 2288 hdrlen = 24;
55de908a 2289 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2290 if (!chanctx_conf) {
2291 ret = -ENOTCONN;
2292 goto free;
2293 }
4bf88530 2294 band = chanctx_conf->def.chan->band;
cf966838
JB		 2295 break;
2296 default:
4c9451ed
JB		 2297 ret = -EINVAL;
2298 goto free;
e2ebc74d
JB		 2299 }
2300
a729cff8 2301 multicast = is_multicast_ether_addr(hdr.addr1);
e2ebc74d 2302
97ffe757
JB		 2303 /* sta is always NULL for mesh */
2304 if (sta) {
2305 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2306 wme_sta = sta->sta.wme;
2307 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2308 /* For mesh, the use of the QoS header is mandatory */
c2c98fde 2309 wme_sta = true;
97ffe757 2310 }
4777be41 2311
527871d7
JB		 2312 /* receiver does QoS (which also means we do) use it */
2313 if (wme_sta) {
065e9605 2314 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 2315 hdrlen += 2;
2316 }
2317
2318 /*
238814fd
JB		 2319 * Drop unicast frames to unauthorised stations unless they are
2320 * EAPOL frames from the local station.
ce3edf6d 2321 */
55182e4a 2322 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
239281f8 2323 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
a6ececf4 2324 !multicast && !authorized &&
55182e4a 2325 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 2326 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 2327#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 2328 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
4c9451ed 2329 sdata->name, hdr.addr1);
ce3edf6d
JB		 2330#endif
2331
2332 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2333
4c9451ed
JB		 2334 ret = -EPERM;
2335 goto free;
ce3edf6d
JB		 2336 }
2337
a729cff8
JB		 2338 if (unlikely(!multicast && skb->sk &&
2339 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
bf7fa551 2340 struct sk_buff *ack_skb = skb_clone_sk(skb);
a729cff8 2341
bf7fa551 2342 if (ack_skb) {
a729cff8 2343 unsigned long flags;
9475af6e 2344 int id;
a729cff8
JB		 2345
2346 spin_lock_irqsave(&local->ack_status_lock, flags);
bf7fa551 2347 id = idr_alloc(&local->ack_status_frames, ack_skb,
9475af6e 2348 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2349 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2350
9475af6e 2351 if (id >= 0) {
a729cff8
JB		 2352 info_id = id;
2353 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
a729cff8 2354 } else {
bf7fa551 2355 kfree_skb(ack_skb);
a729cff8 2356 }
a729cff8
JB		 2357 }
2358 }
2359
7e244707
HS		 2360 /*
2361 * If the skb is shared we need to obtain our own copy.
2362 */
2363 if (skb_shared(skb)) {
a729cff8
JB		 2364 struct sk_buff *tmp_skb = skb;
2365
2366 /* can't happen -- skb is a clone if info_id != 0 */
2367 WARN_ON(info_id);
2368
f8a0a781 2369 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2370 kfree_skb(tmp_skb);
2371
4c9451ed
JB		 2372 if (!skb) {
2373 ret = -ENOMEM;
2374 goto free;
2375 }
7e244707
HS		 2376 }
2377
065e9605 2378 hdr.frame_control = fc;
e2ebc74d
JB		 2379 hdr.duration_id = 0;
2380 hdr.seq_ctrl = 0;
2381
2382 skip_header_bytes = ETH_HLEN;
2383 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2384 encaps_data = bridge_tunnel_header;
2385 encaps_len = sizeof(bridge_tunnel_header);
2386 skip_header_bytes -= 2;
e5c5d22e 2387 } else if (ethertype >= ETH_P_802_3_MIN) {
e2ebc74d
JB		 2388 encaps_data = rfc1042_header;
2389 encaps_len = sizeof(rfc1042_header);
2390 skip_header_bytes -= 2;
2391 } else {
2392 encaps_data = NULL;
2393 encaps_len = 0;
2394 }
2395
7e244707
HS		 2396 nh_pos = skb_network_header(skb) - skb->data;
2397 h_pos = skb_transport_header(skb) - skb->data;
2398
e2ebc74d
JB		 2399 skb_pull(skb, skip_header_bytes);
2400 nh_pos -= skip_header_bytes;
2401 h_pos -= skip_header_bytes;
2402
23c0752a 2403 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2404
23c0752a
JB		 2405 /*
2406 * So we need to modify the skb header and hence need a copy of
2407 * that. The head_need variable above doesn't, so far, include
2408 * the needed header space that we don't need right away. If we
2409 * can, then we don't reallocate right now but only after the
2410 * frame arrives at the master device (if it does...)
2411 *
2412 * If we cannot, however, then we will reallocate to include all
2413 * the ever needed space. Also, if we need to reallocate it anyway,
2414 * make it big enough for everything we may ever need.
2415 */
e2ebc74d 2416
3a5be7d4 2417 if (head_need > 0 || skb_cloned(skb)) {
2475b1cc 2418 head_need += sdata->encrypt_headroom;
23c0752a
JB		 2419 head_need += local->tx_headroom;
2420 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2421 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2422 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2423 skb = NULL;
4c9451ed 2424 return ERR_PTR(-ENOMEM);
c3e7724b 2425 }
e2ebc74d
JB		 2426 }
2427
2428 if (encaps_data) {
2429 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2430 nh_pos += encaps_len;
2431 h_pos += encaps_len;
2432 }
c29b9b9b 2433
e4ab7eb0 2434#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2435 if (meshhdrlen > 0) {
2436 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2437 nh_pos += meshhdrlen;
2438 h_pos += meshhdrlen;
2439 }
e4ab7eb0 2440#endif
33b64eb2 2441
065e9605 2442 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2443 __le16 *qos_control;
2444
f359d3fe 2445 qos_control = (__le16 *) skb_push(skb, 2);
c29b9b9b
JB		 2446 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2447 /*
2448 * Maybe we could actually set some fields here, for now just
2449 * initialise to zero to indicate no special operation.
2450 */
2451 *qos_control = 0;
2452 } else
2453 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2454
e2ebc74d
JB		 2455 nh_pos += hdrlen;
2456 h_pos += hdrlen;
2457
e2ebc74d
JB		 2458 /* Update skb pointers to various headers since this modified frame
2459 * is going to go through Linux networking code that may potentially
2460 * need things like pointer to IP header. */
d57a544d 2461 skb_reset_mac_header(skb);
e2ebc74d
JB		 2462 skb_set_network_header(skb, nh_pos);
2463 skb_set_transport_header(skb, h_pos);
2464
489ee919 2465 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2466 memset(info, 0, sizeof(*info));
2467
a729cff8
JB		 2468 info->flags = info_flags;
2469 info->ack_frame_id = info_id;
73c4e195 2470 info->band = band;
a729cff8 2471
4c9451ed
JB		 2472 return skb;
2473 free:
2474 kfree_skb(skb);
2475 return ERR_PTR(ret);
2476}
2477
17c18bf8
JB		 2478/*
2479 * fast-xmit overview
2480 *
2481 * The core idea of this fast-xmit is to remove per-packet checks by checking
2482 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2483 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2484 * much less work can be done per packet. For example, fragmentation must be
2485 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2486 * in the code here.
2487 *
2488 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2489 * header and other data to aid packet processing in ieee80211_xmit_fast().
2490 *
2491 * The most difficult part of this is that when any of these assumptions
2492 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2493 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2494 * since the per-packet code no longer checks the conditions. This is reflected
2495 * by the calls to these functions throughout the rest of the code, and must be
2496 * maintained if any of the TX path checks change.
2497 */
2498
2499void ieee80211_check_fast_xmit(struct sta_info *sta)
2500{
2501 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2502 struct ieee80211_local *local = sta->local;
2503 struct ieee80211_sub_if_data *sdata = sta->sdata;
2504 struct ieee80211_hdr *hdr = (void *)build.hdr;
2505 struct ieee80211_chanctx_conf *chanctx_conf;
2506 __le16 fc;
2507
30686bf7 2508 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
17c18bf8
JB		 2509 return;
2510
2511 /* Locking here protects both the pointer itself, and against concurrent
2512 * invocations winning data access races to, e.g., the key pointer that
2513 * is used.
2514 * Without it, the invocation of this function right after the key
2515 * pointer changes wouldn't be sufficient, as another CPU could access
2516 * the pointer, then stall, and then do the cache update after the CPU
2517 * that invalidated the key.
2518 * With the locking, such scenarios cannot happen as the check for the
2519 * key and the fast-tx assignment are done atomically, so the CPU that
2520 * modifies the key will either wait or other one will see the key
2521 * cleared/changed already.
2522 */
2523 spin_lock_bh(&sta->lock);
30686bf7
JB		 2524 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2525 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
17c18bf8
JB		 2526 sdata->vif.type == NL80211_IFTYPE_STATION)
2527 goto out;
2528
2529 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2530 goto out;
2531
2532 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2533 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
f7418bc1
FF		 2534 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2535 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
17c18bf8
JB		 2536 goto out;
2537
2538 if (sdata->noack_map)
2539 goto out;
2540
2541 /* fast-xmit doesn't handle fragmentation at all */
725b812c
JB		 2542 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2543 !local->ops->set_frag_threshold)
17c18bf8
JB		 2544 goto out;
2545
2546 rcu_read_lock();
2547 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2548 if (!chanctx_conf) {
2549 rcu_read_unlock();
2550 goto out;
2551 }
2552 build.band = chanctx_conf->def.chan->band;
2553 rcu_read_unlock();
2554
2555 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2556
2557 switch (sdata->vif.type) {
3ffd8840
JB		 2558 case NL80211_IFTYPE_ADHOC:
2559 /* DA SA BSSID */
2560 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2561 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2562 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2563 build.hdr_len = 24;
2564 break;
17c18bf8
JB		 2565 case NL80211_IFTYPE_STATION:
2566 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2567 /* DA SA BSSID */
2568 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2569 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2570 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2571 build.hdr_len = 24;
2572 break;
2573 }
2574
2575 if (sdata->u.mgd.use_4addr) {
2576 /* non-regular ethertype cannot use the fastpath */
2577 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2578 IEEE80211_FCTL_TODS);
2579 /* RA TA DA SA */
2580 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2581 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2582 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2583 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2584 build.hdr_len = 30;
2585 break;
2586 }
2587 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2588 /* BSSID SA DA */
2589 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2590 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2591 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2592 build.hdr_len = 24;
2593 break;
2594 case NL80211_IFTYPE_AP_VLAN:
2595 if (sdata->wdev.use_4addr) {
2596 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2597 IEEE80211_FCTL_TODS);
2598 /* RA TA DA SA */
2599 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2600 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2601 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2602 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2603 build.hdr_len = 30;
2604 break;
2605 }
2606 /* fall through */
2607 case NL80211_IFTYPE_AP:
2608 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2609 /* DA BSSID SA */
2610 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2611 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2612 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2613 build.hdr_len = 24;
2614 break;
2615 default:
2616 /* not handled on fast-xmit */
2617 goto out;
2618 }
2619
2620 if (sta->sta.wme) {
2621 build.hdr_len += 2;
2622 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2623 }
2624
2625 /* We store the key here so there's no point in using rcu_dereference()
2626 * but that's fine because the code that changes the pointers will call
2627 * this function after doing so. For a single CPU that would be enough,
2628 * for multiple see the comment above.
2629 */
2630 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2631 if (!build.key)
2632 build.key = rcu_access_pointer(sdata->default_unicast_key);
2633 if (build.key) {
e495c247 2634 bool gen_iv, iv_spc, mmic;
17c18bf8
JB		 2635
2636 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2637 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
e495c247 2638 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
17c18bf8
JB		 2639
2640 /* don't handle software crypto */
2641 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2642 goto out;
2643
2644 switch (build.key->conf.cipher) {
2645 case WLAN_CIPHER_SUITE_CCMP:
2646 case WLAN_CIPHER_SUITE_CCMP_256:
2647 /* add fixed key ID */
2648 if (gen_iv) {
2649 (build.hdr + build.hdr_len)[3] =
2650 0x20 | (build.key->conf.keyidx << 6);
2651 build.pn_offs = build.hdr_len;
2652 }
2653 if (gen_iv || iv_spc)
2654 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2655 break;
2656 case WLAN_CIPHER_SUITE_GCMP:
2657 case WLAN_CIPHER_SUITE_GCMP_256:
2658 /* add fixed key ID */
2659 if (gen_iv) {
2660 (build.hdr + build.hdr_len)[3] =
2661 0x20 | (build.key->conf.keyidx << 6);
2662 build.pn_offs = build.hdr_len;
2663 }
2664 if (gen_iv || iv_spc)
2665 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2666 break;
e495c247
JB		 2667 case WLAN_CIPHER_SUITE_TKIP:
2668 /* cannot handle MMIC or IV generation in xmit-fast */
2669 if (mmic || gen_iv)
2670 goto out;
2671 if (iv_spc)
2672 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2673 break;
2674 case WLAN_CIPHER_SUITE_WEP40:
2675 case WLAN_CIPHER_SUITE_WEP104:
2676 /* cannot handle IV generation in fast-xmit */
2677 if (gen_iv)
2678 goto out;
2679 if (iv_spc)
2680 build.hdr_len += IEEE80211_WEP_IV_LEN;
2681 break;
2682 case WLAN_CIPHER_SUITE_AES_CMAC:
2683 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2684 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2685 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2686 WARN(1,
2687 "management cipher suite 0x%x enabled for data\n",
2688 build.key->conf.cipher);
17c18bf8 2689 goto out;
e495c247
JB		 2690 default:
2691 /* we don't know how to generate IVs for this at all */
2692 if (WARN_ON(gen_iv))
2693 goto out;
2694 /* pure hardware keys are OK, of course */
2695 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2696 break;
2697 /* cipher scheme might require space allocation */
2698 if (iv_spc &&
2699 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2700 goto out;
2701 if (iv_spc)
2702 build.hdr_len += build.key->conf.iv_len;
17c18bf8
JB		 2703 }
2704
2705 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2706 }
2707
2708 hdr->frame_control = fc;
2709
2710 memcpy(build.hdr + build.hdr_len,
2711 rfc1042_header, sizeof(rfc1042_header));
2712 build.hdr_len += sizeof(rfc1042_header);
2713
2714 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2715 /* if the kmemdup fails, continue w/o fast_tx */
2716 if (!fast_tx)
2717 goto out;
2718
2719 out:
2720 /* we might have raced against another call to this function */
2721 old = rcu_dereference_protected(sta->fast_tx,
2722 lockdep_is_held(&sta->lock));
2723 rcu_assign_pointer(sta->fast_tx, fast_tx);
2724 if (old)
2725 kfree_rcu(old, rcu_head);
2726 spin_unlock_bh(&sta->lock);
2727}
2728
2729void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2730{
2731 struct sta_info *sta;
2732
2733 rcu_read_lock();
2734 list_for_each_entry_rcu(sta, &local->sta_list, list)
2735 ieee80211_check_fast_xmit(sta);
2736 rcu_read_unlock();
2737}
2738
2739void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2740{
2741 struct ieee80211_local *local = sdata->local;
2742 struct sta_info *sta;
2743
2744 rcu_read_lock();
2745
2746 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2747 if (sdata != sta->sdata &&
2748 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2749 continue;
2750 ieee80211_check_fast_xmit(sta);
2751 }
2752
2753 rcu_read_unlock();
2754}
2755
2756void ieee80211_clear_fast_xmit(struct sta_info *sta)
2757{
2758 struct ieee80211_fast_tx *fast_tx;
2759
2760 spin_lock_bh(&sta->lock);
2761 fast_tx = rcu_dereference_protected(sta->fast_tx,
2762 lockdep_is_held(&sta->lock));
2763 RCU_INIT_POINTER(sta->fast_tx, NULL);
2764 spin_unlock_bh(&sta->lock);
2765
2766 if (fast_tx)
2767 kfree_rcu(fast_tx, rcu_head);
2768}
2769
2770static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2771 struct net_device *dev, struct sta_info *sta,
2772 struct ieee80211_fast_tx *fast_tx,
2773 struct sk_buff *skb)
2774{
2775 struct ieee80211_local *local = sdata->local;
2776 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2777 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2778 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2779 struct ethhdr eth;
2780 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2781 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2782 struct ieee80211_tx_data tx;
2783 ieee80211_tx_result r;
2784 struct tid_ampdu_tx *tid_tx = NULL;
2785 u8 tid = IEEE80211_NUM_TIDS;
2786
2787 /* control port protocol needs a lot of special handling */
2788 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2789 return false;
2790
2791 /* only RFC 1042 SNAP */
2792 if (ethertype < ETH_P_802_3_MIN)
2793 return false;
2794
2795 /* don't handle TX status request here either */
2796 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2797 return false;
2798
2799 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2800 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2801 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
472be00d
JB		 2802 if (tid_tx) {
2803 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2804 return false;
2805 if (tid_tx->timeout)
2806 tid_tx->last_tx = jiffies;
2807 }
17c18bf8
JB		 2808 }
2809
2810 /* after this point (skb is modified) we cannot return false */
2811
2812 if (skb_shared(skb)) {
2813 struct sk_buff *tmp_skb = skb;
2814
2815 skb = skb_clone(skb, GFP_ATOMIC);
2816 kfree_skb(tmp_skb);
2817
2818 if (!skb)
2819 return true;
2820 }
2821
5a490510 2822 ieee80211_tx_stats(dev, skb->len + extra_head);
17c18bf8
JB		 2823
2824 /* will not be crypto-handled beyond what we do here, so use false
2825 * as the may-encrypt argument for the resize to not account for
2826 * more room than we already have in 'extra_head'
2827 */
2828 if (unlikely(ieee80211_skb_resize(sdata, skb,
2829 max_t(int, extra_head + hw_headroom -
2830 skb_headroom(skb), 0),
2831 false))) {
2832 kfree_skb(skb);
2833 return true;
2834 }
2835
2836 memcpy(&eth, skb->data, ETH_HLEN - 2);
2837 hdr = (void *)skb_push(skb, extra_head);
2838 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2839 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2840 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2841
2842 memset(info, 0, sizeof(*info));
2843 info->band = fast_tx->band;
2844 info->control.vif = &sdata->vif;
2845 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2846 IEEE80211_TX_CTL_DONTFRAG |
2847 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2848
2849 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2850 *ieee80211_get_qos_ctl(hdr) = tid;
50f36ae6
FF		 2851 if (!sta->sta.txq[0])
2852 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
17c18bf8
JB		 2853 } else {
2854 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2855 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2856 sdata->sequence_number += 0x10;
2857 }
2858
ccc6bb96 2859 if (skb_shinfo(skb)->gso_size)
e5a9f8d0 2860 sta->tx_stats.msdu[tid] +=
ccc6bb96
JB		 2861 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
2862 else
e5a9f8d0 2863 sta->tx_stats.msdu[tid]++;
17c18bf8
JB		 2864
2865 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2866
2867 __skb_queue_head_init(&tx.skbs);
2868
2869 tx.flags = IEEE80211_TX_UNICAST;
2870 tx.local = local;
2871 tx.sdata = sdata;
2872 tx.sta = sta;
2873 tx.key = fast_tx->key;
2874
2875 if (fast_tx->key)
2876 info->control.hw_key = &fast_tx->key->conf;
2877
30686bf7 2878 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
17c18bf8
JB		 2879 tx.skb = skb;
2880 r = ieee80211_tx_h_rate_ctrl(&tx);
2881 skb = tx.skb;
2882 tx.skb = NULL;
2883
2884 if (r != TX_CONTINUE) {
2885 if (r != TX_QUEUED)
2886 kfree_skb(skb);
2887 return true;
2888 }
2889 }
2890
2891 /* statistics normally done by ieee80211_tx_h_stats (but that
2892 * has to consider fragmentation, so is more complex)
2893 */
e5a9f8d0
JB		 2894 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
2895 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
17c18bf8
JB		 2896
2897 if (fast_tx->pn_offs) {
2898 u64 pn;
2899 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2900
2901 switch (fast_tx->key->conf.cipher) {
2902 case WLAN_CIPHER_SUITE_CCMP:
2903 case WLAN_CIPHER_SUITE_CCMP_256:
17c18bf8
JB		 2904 case WLAN_CIPHER_SUITE_GCMP:
2905 case WLAN_CIPHER_SUITE_GCMP_256:
db388a56 2906 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
17c18bf8
JB		 2907 crypto_hdr[0] = pn;
2908 crypto_hdr[1] = pn >> 8;
2909 crypto_hdr[4] = pn >> 16;
2910 crypto_hdr[5] = pn >> 24;
2911 crypto_hdr[6] = pn >> 32;
2912 crypto_hdr[7] = pn >> 40;
2913 break;
2914 }
2915 }
2916
2917 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2918 sdata = container_of(sdata->bss,
2919 struct ieee80211_sub_if_data, u.ap);
2920
2921 __skb_queue_tail(&tx.skbs, skb);
2922 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2923 return true;
2924}
2925
4c9451ed
JB		 2926void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2927 struct net_device *dev,
2928 u32 info_flags)
2929{
2930 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
97ffe757 2931 struct sta_info *sta;
80616c0d 2932 struct sk_buff *next;
4c9451ed
JB		 2933
2934 if (unlikely(skb->len < ETH_HLEN)) {
2935 kfree_skb(skb);
2936 return;
2937 }
2938
2939 rcu_read_lock();
e2ebc74d 2940
2d981fdd
JB		 2941 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2942 goto out_free;
4c9451ed 2943
17c18bf8
JB		 2944 if (!IS_ERR_OR_NULL(sta)) {
2945 struct ieee80211_fast_tx *fast_tx;
2946
2947 fast_tx = rcu_dereference(sta->fast_tx);
2948
2949 if (fast_tx &&
2950 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2951 goto out;
2952 }
2953
80616c0d
JB		 2954 if (skb_is_gso(skb)) {
2955 struct sk_buff *segs;
680a0dab 2956
80616c0d
JB		 2957 segs = skb_gso_segment(skb, 0);
2958 if (IS_ERR(segs)) {
2d981fdd 2959 goto out_free;
80616c0d
JB		 2960 } else if (segs) {
2961 consume_skb(skb);
2962 skb = segs;
2963 }
2964 } else {
2965 /* we cannot process non-linear frames on this path */
2966 if (skb_linearize(skb)) {
2967 kfree_skb(skb);
2968 goto out;
2969 }
2970
2971 /* the frame could be fragmented, software-encrypted, and other
2972 * things so we cannot really handle checksum offload with it -
2973 * fix it up in software before we handle anything else.
2974 */
2975 if (skb->ip_summed == CHECKSUM_PARTIAL) {
f603f1f3
JB		 2976 skb_set_transport_header(skb,
2977 skb_checksum_start_offset(skb));
80616c0d
JB		 2978 if (skb_checksum_help(skb))
2979 goto out_free;
2980 }
2d981fdd
JB		 2981 }
2982
80616c0d
JB		 2983 next = skb;
2984 while (next) {
2985 skb = next;
2986 next = skb->next;
4c9451ed 2987
80616c0d
JB		 2988 skb->prev = NULL;
2989 skb->next = NULL;
2990
2991 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2992 if (IS_ERR(skb))
2993 goto out;
e2ebc74d 2994
5a490510 2995 ieee80211_tx_stats(dev, skb->len);
80616c0d
JB		 2996
2997 ieee80211_xmit(sdata, sta, skb);
2998 }
2d981fdd
JB		 2999 goto out;
3000 out_free:
3001 kfree_skb(skb);
4c9451ed 3002 out:
55de908a 3003 rcu_read_unlock();
e2ebc74d
JB		 3004}
3005
4c9451ed
JB		 3006/**
3007 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3008 * @skb: packet to be sent
3009 * @dev: incoming interface
3010 *
3011 * On failure skb will be freed.
3012 */
24d342c5
LK		 3013netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3014 struct net_device *dev)
3015{
3016 __ieee80211_subif_start_xmit(skb, dev, 0);
3017 return NETDEV_TX_OK;
3018}
e2ebc74d 3019
7528ec57
JB		 3020struct sk_buff *
3021ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3022 struct sk_buff *skb, u32 info_flags)
3023{
3024 struct ieee80211_hdr *hdr;
3025 struct ieee80211_tx_data tx = {
3026 .local = sdata->local,
3027 .sdata = sdata,
3028 };
97ffe757 3029 struct sta_info *sta;
7528ec57
JB		 3030
3031 rcu_read_lock();
3032
97ffe757
JB		 3033 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3034 kfree_skb(skb);
3035 skb = ERR_PTR(-EINVAL);
3036 goto out;
3037 }
3038
3039 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
7528ec57
JB		 3040 if (IS_ERR(skb))
3041 goto out;
3042
3043 hdr = (void *)skb->data;
3044 tx.sta = sta_info_get(sdata, hdr->addr1);
3045 tx.skb = skb;
3046
3047 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3048 rcu_read_unlock();
3049 kfree_skb(skb);
3050 return ERR_PTR(-EINVAL);
3051 }
3052
3053out:
3054 rcu_read_unlock();
3055 return skb;
3056}
3057
e2530083
JB		 3058/*
3059 * ieee80211_clear_tx_pending may not be called in a context where
3060 * it is possible that it packets could come in again.
3061 */
e2ebc74d
JB		 3062void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3063{
1f98ab7f 3064 struct sk_buff *skb;
2de8e0d9 3065 int i;
e2ebc74d 3066
1f98ab7f
FF		 3067 for (i = 0; i < local->hw.queues; i++) {
3068 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3069 ieee80211_free_txskb(&local->hw, skb);
3070 }
e2ebc74d
JB		 3071}
3072
7bb45683
JB		 3073/*
3074 * Returns false if the frame couldn't be transmitted but was queued instead,
3075 * which in this case means re-queued -- take as an indication to stop sending
3076 * more pending frames.
3077 */
cd8ffc80
JB		 3078static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3079 struct sk_buff *skb)
3080{
3081 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3082 struct ieee80211_sub_if_data *sdata;
3083 struct sta_info *sta;
3084 struct ieee80211_hdr *hdr;
7bb45683 3085 bool result;
55de908a 3086 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 3087
5061b0c2 3088 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 3089
3090 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 3091 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3092 if (unlikely(!chanctx_conf)) {
3093 dev_kfree_skb(skb);
3094 return true;
3095 }
73c4e195 3096 info->band = chanctx_conf->def.chan->band;
7c10770f 3097 result = ieee80211_tx(sdata, NULL, skb, true);
cd8ffc80 3098 } else {
252b86c4
JB		 3099 struct sk_buff_head skbs;
3100
3101 __skb_queue_head_init(&skbs);
3102 __skb_queue_tail(&skbs, skb);
3103
cd8ffc80 3104 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 3105 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 3106
74e4dbfd 3107 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 3108 }
3109
cd8ffc80
JB		 3110 return result;
3111}
3112
e2530083 3113/*
3b8d81e0 3114 * Transmit all pending packets. Called from tasklet.
e2530083 3115 */
e2ebc74d
JB		 3116void ieee80211_tx_pending(unsigned long data)
3117{
3118 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 3119 unsigned long flags;
cd8ffc80 3120 int i;
3b8d81e0 3121 bool txok;
e2ebc74d 3122
f0e72851 3123 rcu_read_lock();
e2530083 3124
3b8d81e0 3125 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 3126 for (i = 0; i < local->hw.queues; i++) {
3127 /*
3128 * If queue is stopped by something other than due to pending
3129 * frames, or we have no pending frames, proceed to next queue.
3130 */
3b8d81e0 3131 if (local->queue_stop_reasons[i] ||
2a577d98 3132 skb_queue_empty(&local->pending[i]))
e2ebc74d 3133 continue;
e2530083 3134
2a577d98 3135 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 3136 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 3137 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 3138
a7bc376c 3139 if (WARN_ON(!info->control.vif)) {
c3e7724b 3140 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 3141 continue;
3142 }
3143
3b8d81e0
JB		 3144 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3145 flags);
3146
3147 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 3148 spin_lock_irqsave(&local->queue_stop_reason_lock,
3149 flags);
3150 if (!txok)
2a577d98 3151 break;
e2ebc74d 3152 }
7236fe29
JB		 3153
3154 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 3155 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 3156 }
3b8d81e0 3157 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 3158
f0e72851 3159 rcu_read_unlock();
e2ebc74d
JB		 3160}
3161
3162/* functions for drivers to get certain frames */
3163
eac70c13 3164static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3165 struct ps_data *ps, struct sk_buff *skb,
3166 bool is_template)
e2ebc74d
JB		 3167{
3168 u8 *pos, *tim;
3169 int aid0 = 0;
3170 int i, have_bits = 0, n1, n2;
3171
3172 /* Generate bitmap for TIM only if there are any STAs in power save
3173 * mode. */
d012a605 3174 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 3175 /* in the hope that this is faster than
3176 * checking byte-for-byte */
f359d3fe 3177 have_bits = !bitmap_empty((unsigned long *)ps->tim,
e2ebc74d 3178 IEEE80211_MAX_AID+1);
6ec8c332
AO		 3179 if (!is_template) {
3180 if (ps->dtim_count == 0)
3181 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3182 else
3183 ps->dtim_count--;
3184 }
e2ebc74d
JB		 3185
3186 tim = pos = (u8 *) skb_put(skb, 6);
3187 *pos++ = WLAN_EID_TIM;
3188 *pos++ = 4;
d012a605 3189 *pos++ = ps->dtim_count;
8860020e 3190 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 3191
d012a605 3192 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 3193 aid0 = 1;
3194
d012a605 3195 ps->dtim_bc_mc = aid0 == 1;
512119b3 3196
e2ebc74d
JB		 3197 if (have_bits) {
3198 /* Find largest even number N1 so that bits numbered 1 through
3199 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3200 * (N2 + 1) x 8 through 2007 are 0. */
3201 n1 = 0;
3202 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 3203 if (ps->tim[i]) {
e2ebc74d
JB		 3204 n1 = i & 0xfe;
3205 break;
3206 }
3207 }
3208 n2 = n1;
3209 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 3210 if (ps->tim[i]) {
e2ebc74d
JB		 3211 n2 = i;
3212 break;
3213 }
3214 }
3215
3216 /* Bitmap control */
3217 *pos++ = n1 | aid0;
3218 /* Part Virt Bitmap */
5220da39 3219 skb_put(skb, n2 - n1);
d012a605 3220 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 3221
3222 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 3223 } else {
3224 *pos++ = aid0; /* Bitmap control */
3225 *pos++ = 0; /* Part Virt Bitmap */
3226 }
e2ebc74d
JB		 3227}
3228
eac70c13 3229static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3230 struct ps_data *ps, struct sk_buff *skb,
3231 bool is_template)
eac70c13
MP		 3232{
3233 struct ieee80211_local *local = sdata->local;
3234
3235 /*
3236 * Not very nice, but we want to allow the driver to call
3237 * ieee80211_beacon_get() as a response to the set_tim()
3238 * callback. That, however, is already invoked under the
3239 * sta_lock to guarantee consistent and race-free update
3240 * of the tim bitmap in mac80211 and the driver.
3241 */
3242 if (local->tim_in_locked_section) {
6ec8c332 3243 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
eac70c13 3244 } else {
1b91731d 3245 spin_lock_bh(&local->tim_lock);
6ec8c332 3246 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
1b91731d 3247 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 3248 }
3249
3250 return 0;
3251}
3252
1af586c9
AO		 3253static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3254 struct beacon_data *beacon)
73da7d5b
SW		 3255{
3256 struct probe_resp *resp;
cd7760e6
SW		 3257 u8 *beacon_data;
3258 size_t beacon_data_len;
0d06d9ba 3259 int i;
af296bdb 3260 u8 count = beacon->csa_current_counter;
cd7760e6
SW		 3261
3262 switch (sdata->vif.type) {
3263 case NL80211_IFTYPE_AP:
3264 beacon_data = beacon->tail;
3265 beacon_data_len = beacon->tail_len;
3266 break;
3267 case NL80211_IFTYPE_ADHOC:
3268 beacon_data = beacon->head;
3269 beacon_data_len = beacon->head_len;
3270 break;
b8456a14
CYY		 3271 case NL80211_IFTYPE_MESH_POINT:
3272 beacon_data = beacon->head;
3273 beacon_data_len = beacon->head_len;
3274 break;
cd7760e6
SW		 3275 default:
3276 return;
3277 }
73da7d5b 3278
af296bdb 3279 rcu_read_lock();
0d06d9ba 3280 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
af296bdb 3281 resp = rcu_dereference(sdata->u.ap.probe_resp);
0d06d9ba 3282
af296bdb
MK		 3283 if (beacon->csa_counter_offsets[i]) {
3284 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3285 beacon_data_len)) {
0d06d9ba
AO		 3286 rcu_read_unlock();
3287 return;
3288 }
af296bdb
MK		 3289
3290 beacon_data[beacon->csa_counter_offsets[i]] = count;
73da7d5b 3291 }
af296bdb
MK		 3292
3293 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3294 resp->data[resp->csa_counter_offsets[i]] = count;
73da7d5b 3295 }
af296bdb 3296 rcu_read_unlock();
1af586c9
AO		 3297}
3298
e996ec2a
WD		 3299static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3300{
3301 beacon->csa_current_counter--;
3302
3303 /* the counter should never reach 0 */
3304 WARN_ON_ONCE(!beacon->csa_current_counter);
3305
3306 return beacon->csa_current_counter;
3307}
3308
1af586c9
AO		 3309u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3310{
3311 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
af296bdb
MK		 3312 struct beacon_data *beacon = NULL;
3313 u8 count = 0;
0d06d9ba 3314
af296bdb
MK		 3315 rcu_read_lock();
3316
3317 if (sdata->vif.type == NL80211_IFTYPE_AP)
3318 beacon = rcu_dereference(sdata->u.ap.beacon);
3319 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3320 beacon = rcu_dereference(sdata->u.ibss.presp);
3321 else if (ieee80211_vif_is_mesh(&sdata->vif))
3322 beacon = rcu_dereference(sdata->u.mesh.beacon);
3323
3324 if (!beacon)
3325 goto unlock;
3326
e996ec2a 3327 count = __ieee80211_csa_update_counter(beacon);
1af586c9 3328
af296bdb
MK		 3329unlock:
3330 rcu_read_unlock();
3331 return count;
73da7d5b 3332}
1af586c9 3333EXPORT_SYMBOL(ieee80211_csa_update_counter);
73da7d5b
SW		 3334
3335bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3336{
3337 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3338 struct beacon_data *beacon = NULL;
3339 u8 *beacon_data;
3340 size_t beacon_data_len;
73da7d5b
SW		 3341 int ret = false;
3342
3343 if (!ieee80211_sdata_running(sdata))
3344 return false;
3345
3346 rcu_read_lock();
3347 if (vif->type == NL80211_IFTYPE_AP) {
3348 struct ieee80211_if_ap *ap = &sdata->u.ap;
3349
3350 beacon = rcu_dereference(ap->beacon);
3351 if (WARN_ON(!beacon || !beacon->tail))
3352 goto out;
3353 beacon_data = beacon->tail;
3354 beacon_data_len = beacon->tail_len;
cd7760e6
SW		 3355 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3356 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3357
3358 beacon = rcu_dereference(ifibss->presp);
3359 if (!beacon)
3360 goto out;
3361
b8456a14
CYY		 3362 beacon_data = beacon->head;
3363 beacon_data_len = beacon->head_len;
3364 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3365 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3366
3367 beacon = rcu_dereference(ifmsh->beacon);
3368 if (!beacon)
3369 goto out;
3370
cd7760e6
SW		 3371 beacon_data = beacon->head;
3372 beacon_data_len = beacon->head_len;
73da7d5b
SW		 3373 } else {
3374 WARN_ON(1);
3375 goto out;
3376 }
3377
10d78f27
MK		 3378 if (!beacon->csa_counter_offsets[0])
3379 goto out;
3380
af296bdb 3381 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
73da7d5b
SW		 3382 goto out;
3383
af296bdb 3384 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
73da7d5b
SW		 3385 ret = true;
3386 out:
3387 rcu_read_unlock();
3388
3389 return ret;
3390}
3391EXPORT_SYMBOL(ieee80211_csa_is_complete);
3392
6ec8c332
AO		 3393static struct sk_buff *
3394__ieee80211_beacon_get(struct ieee80211_hw *hw,
3395 struct ieee80211_vif *vif,
3396 struct ieee80211_mutable_offsets *offs,
3397 bool is_template)
e2ebc74d
JB		 3398{
3399 struct ieee80211_local *local = hw_to_local(hw);
af296bdb 3400 struct beacon_data *beacon = NULL;
9d139c81 3401 struct sk_buff *skb = NULL;
e039fa4a 3402 struct ieee80211_tx_info *info;
e2ebc74d 3403 struct ieee80211_sub_if_data *sdata = NULL;
55de908a 3404 enum ieee80211_band band;
e00cfce0 3405 struct ieee80211_tx_rate_control txrc;
55de908a 3406 struct ieee80211_chanctx_conf *chanctx_conf;
1af586c9 3407 int csa_off_base = 0;
8318d78a 3408
5dfdaf58 3409 rcu_read_lock();
e2ebc74d 3410
32bfd35d 3411 sdata = vif_to_sdata(vif);
55de908a 3412 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 3413
55de908a 3414 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 3415 goto out;
3416
6ec8c332
AO		 3417 if (offs)
3418 memset(offs, 0, sizeof(*offs));
eddcbb94 3419
05c914fe 3420 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605 3421 struct ieee80211_if_ap *ap = &sdata->u.ap;
d012a605 3422
af296bdb 3423 beacon = rcu_dereference(ap->beacon);
3ad97fbc 3424 if (beacon) {
10d78f27 3425 if (beacon->csa_counter_offsets[0]) {
1af586c9 3426 if (!is_template)
e996ec2a 3427 __ieee80211_csa_update_counter(beacon);
1af586c9
AO		 3428
3429 ieee80211_set_csa(sdata, beacon);
3430 }
73da7d5b 3431
902acc78
JB		 3432 /*
3433 * headroom, head length,
3434 * tail length and maximum TIM length
3435 */
3436 skb = dev_alloc_skb(local->tx_headroom +
3437 beacon->head_len +
70dabeb7
FF		 3438 beacon->tail_len + 256 +
3439 local->hw.extra_beacon_tailroom);
902acc78
JB		 3440 if (!skb)
3441 goto out;
33b64eb2 3442
902acc78
JB		 3443 skb_reserve(skb, local->tx_headroom);
3444 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3445 beacon->head_len);
33b64eb2 3446
6ec8c332
AO		 3447 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3448 is_template);
33b64eb2 3449
6ec8c332
AO		 3450 if (offs) {
3451 offs->tim_offset = beacon->head_len;
3452 offs->tim_length = skb->len - beacon->head_len;
1af586c9
AO		 3453
3454 /* for AP the csa offsets are from tail */
3455 csa_off_base = skb->len;
6ec8c332 3456 }
eddcbb94 3457
902acc78
JB		 3458 if (beacon->tail)
3459 memcpy(skb_put(skb, beacon->tail_len),
3460 beacon->tail, beacon->tail_len);
9d139c81
JB		 3461 } else
3462 goto out;
05c914fe 3463 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 3464 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 3465 struct ieee80211_hdr *hdr;
33b64eb2 3466
af296bdb
MK		 3467 beacon = rcu_dereference(ifibss->presp);
3468 if (!beacon)
9d139c81
JB		 3469 goto out;
3470
10d78f27 3471 if (beacon->csa_counter_offsets[0]) {
1af586c9 3472 if (!is_template)
e996ec2a 3473 __ieee80211_csa_update_counter(beacon);
cd7760e6 3474
af296bdb 3475 ieee80211_set_csa(sdata, beacon);
1af586c9 3476 }
cd7760e6 3477
af296bdb 3478 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
70dabeb7 3479 local->hw.extra_beacon_tailroom);
9d139c81
JB		 3480 if (!skb)
3481 goto out;
c3ffeab4 3482 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3483 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3484 beacon->head_len);
9d139c81
JB		 3485
3486 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 3487 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3488 IEEE80211_STYPE_BEACON);
902acc78 3489 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 3490 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
472dbc45 3491
af296bdb
MK		 3492 beacon = rcu_dereference(ifmsh->beacon);
3493 if (!beacon)
ac1bd846 3494 goto out;
ac1bd846 3495
10d78f27 3496 if (beacon->csa_counter_offsets[0]) {
1af586c9
AO		 3497 if (!is_template)
3498 /* TODO: For mesh csa_counter is in TU, so
3499 * decrementing it by one isn't correct, but
3500 * for now we leave it consistent with overall
3501 * mac80211's behavior.
3502 */
e996ec2a 3503 __ieee80211_csa_update_counter(beacon);
1af586c9 3504
af296bdb 3505 ieee80211_set_csa(sdata, beacon);
1af586c9 3506 }
b8456a14 3507
dbf498fb 3508 if (ifmsh->sync_ops)
af296bdb 3509 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
dbf498fb 3510
3b69a9c5 3511 skb = dev_alloc_skb(local->tx_headroom +
af296bdb 3512 beacon->head_len +
3f52b7e3 3513 256 + /* TIM IE */
af296bdb 3514 beacon->tail_len +
70dabeb7 3515 local->hw.extra_beacon_tailroom);
902acc78
JB		 3516 if (!skb)
3517 goto out;
2b5e1967 3518 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3519 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3520 beacon->head_len);
6ec8c332
AO		 3521 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3522
3523 if (offs) {
af296bdb
MK		 3524 offs->tim_offset = beacon->head_len;
3525 offs->tim_length = skb->len - beacon->head_len;
6ec8c332
AO		 3526 }
3527
af296bdb
MK		 3528 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3529 beacon->tail_len);
9d139c81
JB		 3530 } else {
3531 WARN_ON(1);
5dfdaf58 3532 goto out;
e2ebc74d
JB		 3533 }
3534
1af586c9 3535 /* CSA offsets */
af296bdb 3536 if (offs && beacon) {
1af586c9
AO		 3537 int i;
3538
3539 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
af296bdb 3540 u16 csa_off = beacon->csa_counter_offsets[i];
1af586c9
AO		 3541
3542 if (!csa_off)
3543 continue;
3544
3545 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3546 }
3547 }
3548
4bf88530 3549 band = chanctx_conf->def.chan->band;
55de908a 3550
e039fa4a
JB		 3551 info = IEEE80211_SKB_CB(skb);
3552
3b8d81e0 3553 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 3554 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 3555 info->band = band;
e00cfce0
JM		 3556
3557 memset(&txrc, 0, sizeof(txrc));
3558 txrc.hw = hw;
e31583cd 3559 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 3560 txrc.bss_conf = &sdata->vif.bss_conf;
3561 txrc.skb = skb;
3562 txrc.reported_rate.idx = -1;
37eb0b16 3563 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 3564 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 3565 txrc.max_rate_idx = -1;
3566 else
3567 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 3568 txrc.bss = true;
e00cfce0 3569 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 3570
3571 info->control.vif = vif;
f591fa5d 3572
a472e71b
JL		 3573 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3574 IEEE80211_TX_CTL_ASSIGN_SEQ |
3575 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 3576 out:
5dfdaf58 3577 rcu_read_unlock();
e2ebc74d 3578 return skb;
6ec8c332
AO		 3579
3580}
3581
3582struct sk_buff *
3583ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3584 struct ieee80211_vif *vif,
3585 struct ieee80211_mutable_offsets *offs)
3586{
3587 return __ieee80211_beacon_get(hw, vif, offs, true);
3588}
3589EXPORT_SYMBOL(ieee80211_beacon_get_template);
3590
3591struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3592 struct ieee80211_vif *vif,
3593 u16 *tim_offset, u16 *tim_length)
3594{
3595 struct ieee80211_mutable_offsets offs = {};
3596 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
35afa588
HS		 3597 struct sk_buff *copy;
3598 struct ieee80211_supported_band *sband;
3599 int shift;
3600
3601 if (!bcn)
3602 return bcn;
6ec8c332
AO		 3603
3604 if (tim_offset)
3605 *tim_offset = offs.tim_offset;
3606
3607 if (tim_length)
3608 *tim_length = offs.tim_length;
3609
35afa588
HS		 3610 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
3611 !hw_to_local(hw)->monitors)
3612 return bcn;
3613
3614 /* send a copy to monitor interfaces */
3615 copy = skb_copy(bcn, GFP_ATOMIC);
3616 if (!copy)
3617 return bcn;
3618
3619 shift = ieee80211_vif_get_shift(vif);
3620 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
3621 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
3622
6ec8c332 3623 return bcn;
e2ebc74d 3624}
eddcbb94 3625EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 3626
02945821
AN		 3627struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3628 struct ieee80211_vif *vif)
3629{
3630 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 3631 struct sk_buff *skb = NULL;
3632 struct probe_resp *presp = NULL;
02945821
AN		 3633 struct ieee80211_hdr *hdr;
3634 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3635
3636 if (sdata->vif.type != NL80211_IFTYPE_AP)
3637 return NULL;
3638
3639 rcu_read_lock();
3640
3641 ap = &sdata->u.ap;
3642 presp = rcu_dereference(ap->probe_resp);
3643 if (!presp)
3644 goto out;
3645
aa7a0080 3646 skb = dev_alloc_skb(presp->len);
02945821
AN		 3647 if (!skb)
3648 goto out;
3649
aa7a0080
ES		 3650 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3651
02945821
AN		 3652 hdr = (struct ieee80211_hdr *) skb->data;
3653 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3654
3655out:
3656 rcu_read_unlock();
3657 return skb;
3658}
3659EXPORT_SYMBOL(ieee80211_proberesp_get);
3660
7044cc56
KV		 3661struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3662 struct ieee80211_vif *vif)
3663{
3664 struct ieee80211_sub_if_data *sdata;
3665 struct ieee80211_if_managed *ifmgd;
3666 struct ieee80211_pspoll *pspoll;
3667 struct ieee80211_local *local;
3668 struct sk_buff *skb;
3669
3670 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3671 return NULL;
3672
3673 sdata = vif_to_sdata(vif);
3674 ifmgd = &sdata->u.mgd;
3675 local = sdata->local;
3676
3677 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 3678 if (!skb)
7044cc56 3679 return NULL;
d15b8459 3680
7044cc56
KV		 3681 skb_reserve(skb, local->hw.extra_tx_headroom);
3682
3683 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3684 memset(pspoll, 0, sizeof(*pspoll));
3685 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3686 IEEE80211_STYPE_PSPOLL);
3687 pspoll->aid = cpu_to_le16(ifmgd->aid);
3688
3689 /* aid in PS-Poll has its two MSBs each set to 1 */
3690 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3691
3692 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3693 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3694
3695 return skb;
3696}
3697EXPORT_SYMBOL(ieee80211_pspoll_get);
3698
3699struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3700 struct ieee80211_vif *vif)
3701{
3702 struct ieee80211_hdr_3addr *nullfunc;
3703 struct ieee80211_sub_if_data *sdata;
3704 struct ieee80211_if_managed *ifmgd;
3705 struct ieee80211_local *local;
3706 struct sk_buff *skb;
3707
3708 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3709 return NULL;
3710
3711 sdata = vif_to_sdata(vif);
3712 ifmgd = &sdata->u.mgd;
3713 local = sdata->local;
3714
3715 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 3716 if (!skb)
7044cc56 3717 return NULL;
d15b8459 3718
7044cc56
KV		 3719 skb_reserve(skb, local->hw.extra_tx_headroom);
3720
3721 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3722 sizeof(*nullfunc));
3723 memset(nullfunc, 0, sizeof(*nullfunc));
3724 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3725 IEEE80211_STYPE_NULLFUNC |
3726 IEEE80211_FCTL_TODS);
3727 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3728 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3729 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3730
3731 return skb;
3732}
3733EXPORT_SYMBOL(ieee80211_nullfunc_get);
3734
05e54ea6 3735struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
a344d677 3736 const u8 *src_addr,
05e54ea6 3737 const u8 *ssid, size_t ssid_len,
b9a9ada1 3738 size_t tailroom)
05e54ea6 3739{
a344d677 3740 struct ieee80211_local *local = hw_to_local(hw);
05e54ea6
KV		 3741 struct ieee80211_hdr_3addr *hdr;
3742 struct sk_buff *skb;
3743 size_t ie_ssid_len;
3744 u8 *pos;
3745
05e54ea6
KV		 3746 ie_ssid_len = 2 + ssid_len;
3747
3748 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 3749 ie_ssid_len + tailroom);
d15b8459 3750 if (!skb)
05e54ea6 3751 return NULL;
05e54ea6
KV		 3752
3753 skb_reserve(skb, local->hw.extra_tx_headroom);
3754
3755 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3756 memset(hdr, 0, sizeof(*hdr));
3757 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3758 IEEE80211_STYPE_PROBE_REQ);
e83e6541 3759 eth_broadcast_addr(hdr->addr1);
a344d677 3760 memcpy(hdr->addr2, src_addr, ETH_ALEN);
e83e6541 3761 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 3762
3763 pos = skb_put(skb, ie_ssid_len);
3764 *pos++ = WLAN_EID_SSID;
3765 *pos++ = ssid_len;
88c868c4 3766 if (ssid_len)
05e54ea6
KV		 3767 memcpy(pos, ssid, ssid_len);
3768 pos += ssid_len;
3769
05e54ea6
KV		 3770 return skb;
3771}
3772EXPORT_SYMBOL(ieee80211_probereq_get);
3773
32bfd35d 3774void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3775 const void *frame, size_t frame_len,
e039fa4a 3776 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3777 struct ieee80211_rts *rts)
3778{
3779 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3780
065e9605
HH		 3781 rts->frame_control =
3782 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 3783 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3784 frame_txctl);
e2ebc74d
JB		 3785 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3786 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3787}
3788EXPORT_SYMBOL(ieee80211_rts_get);
3789
32bfd35d 3790void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3791 const void *frame, size_t frame_len,
e039fa4a 3792 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3793 struct ieee80211_cts *cts)
3794{
3795 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3796
065e9605
HH		 3797 cts->frame_control =
3798 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 3799 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3800 frame_len, frame_txctl);
e2ebc74d
JB		 3801 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3802}
3803EXPORT_SYMBOL(ieee80211_ctstoself_get);
3804
3805struct sk_buff *
32bfd35d 3806ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 3807 struct ieee80211_vif *vif)
e2ebc74d
JB		 3808{
3809 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 3810 struct sk_buff *skb = NULL;
5cf121c3 3811 struct ieee80211_tx_data tx;
e2ebc74d 3812 struct ieee80211_sub_if_data *sdata;
d012a605 3813 struct ps_data *ps;
e039fa4a 3814 struct ieee80211_tx_info *info;
55de908a 3815 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 3816
32bfd35d 3817 sdata = vif_to_sdata(vif);
5dfdaf58 3818
5dfdaf58 3819 rcu_read_lock();
55de908a 3820 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 3821
d012a605
MP		 3822 if (!chanctx_conf)
3823 goto out;
3824
3825 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3826 struct beacon_data *beacon =
3827 rcu_dereference(sdata->u.ap.beacon);
3828
3829 if (!beacon || !beacon->head)
3830 goto out;
3831
3832 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 3833 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3834 ps = &sdata->u.mesh.ps;
d012a605 3835 } else {
747cf5e9 3836 goto out;
d012a605 3837 }
5dfdaf58 3838
d012a605 3839 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 3840 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 3841
e2ebc74d 3842 while (1) {
d012a605 3843 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 3844 if (!skb)
747cf5e9 3845 goto out;
e2ebc74d
JB		 3846 local->total_ps_buffered--;
3847
d012a605 3848 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 3849 struct ieee80211_hdr *hdr =
3850 (struct ieee80211_hdr *) skb->data;
3851 /* more buffered multicast/broadcast frames ==> set
3852 * MoreData flag in IEEE 802.11 header to inform PS
3853 * STAs */
3854 hdr->frame_control |=
3855 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3856 }
3857
112c44b2 3858 if (sdata->vif.type == NL80211_IFTYPE_AP)
7cbf9d01 3859 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
7c10770f 3860 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
e2ebc74d
JB		 3861 break;
3862 dev_kfree_skb_any(skb);
3863 }
e039fa4a
JB		 3864
3865 info = IEEE80211_SKB_CB(skb);
3866
5cf121c3 3867 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 3868 info->band = chanctx_conf->def.chan->band;
e2ebc74d 3869
97b045d6 3870 if (invoke_tx_handlers(&tx))
e2ebc74d 3871 skb = NULL;
97b045d6 3872 out:
d0709a65 3873 rcu_read_unlock();
e2ebc74d
JB		 3874
3875 return skb;
3876}
3877EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 3878
b6da911b
LK		 3879int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3880{
3881 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3882 struct ieee80211_sub_if_data *sdata = sta->sdata;
3883 struct ieee80211_local *local = sdata->local;
3884 int ret;
3885 u32 queues;
3886
3887 lockdep_assert_held(&local->sta_mtx);
3888
3889 /* only some cases are supported right now */
3890 switch (sdata->vif.type) {
3891 case NL80211_IFTYPE_STATION:
3892 case NL80211_IFTYPE_AP:
3893 case NL80211_IFTYPE_AP_VLAN:
3894 break;
3895 default:
3896 WARN_ON(1);
3897 return -EINVAL;
3898 }
3899
3900 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3901 return -EINVAL;
3902
3903 if (sta->reserved_tid == tid) {
3904 ret = 0;
3905 goto out;
3906 }
3907
3908 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3909 sdata_err(sdata, "TID reservation already active\n");
3910 ret = -EALREADY;
3911 goto out;
3912 }
3913
3914 ieee80211_stop_vif_queues(sdata->local, sdata,
3915 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3916
3917 synchronize_net();
3918
3919 /* Tear down BA sessions so we stop aggregating on this TID */
30686bf7 3920 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
b6da911b
LK		 3921 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3922 __ieee80211_stop_tx_ba_session(sta, tid,
3923 AGG_STOP_LOCAL_REQUEST);
3924 }
3925
3926 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3b24f4c6 3927 __ieee80211_flush_queues(local, sdata, queues, false);
b6da911b
LK		 3928
3929 sta->reserved_tid = tid;
3930
3931 ieee80211_wake_vif_queues(local, sdata,
3932 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3933
30686bf7 3934 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
b6da911b
LK		 3935 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3936
3937 ret = 0;
3938 out:
3939 return ret;
3940}
3941EXPORT_SYMBOL(ieee80211_reserve_tid);
3942
3943void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3944{
3945 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3946 struct ieee80211_sub_if_data *sdata = sta->sdata;
3947
3948 lockdep_assert_held(&sdata->local->sta_mtx);
3949
3950 /* only some cases are supported right now */
3951 switch (sdata->vif.type) {
3952 case NL80211_IFTYPE_STATION:
3953 case NL80211_IFTYPE_AP:
3954 case NL80211_IFTYPE_AP_VLAN:
3955 break;
3956 default:
3957 WARN_ON(1);
3958 return;
3959 }
3960
3961 if (tid != sta->reserved_tid) {
3962 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3963 return;
3964 }
3965
3966 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3967}
3968EXPORT_SYMBOL(ieee80211_unreserve_tid);
3969
55de908a
JB		 3970void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3971 struct sk_buff *skb, int tid,
3972 enum ieee80211_band band)
3b8d81e0 3973{
353d09c6 3974 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 3975
d57a544d
ZS		 3976 skb_reset_mac_header(skb);
3977 skb_reset_network_header(skb);
3978 skb_reset_transport_header(skb);
3b8d81e0 3979
3a25a8c8 3980 skb_set_queue_mapping(skb, ac);
cf6bb79a 3981 skb->priority = tid;
cf0277e7 3982
89afe614
JB		 3983 skb->dev = sdata->dev;
3984
3d34deb6
JB		 3985 /*
3986 * The other path calling ieee80211_xmit is from the tasklet,
3987 * and while we can handle concurrent transmissions locking
3988 * requirements are that we do not come into tx with bhs on.
3989 */
3990 local_bh_disable();
73c4e195 3991 IEEE80211_SKB_CB(skb)->band = band;
7c10770f 3992 ieee80211_xmit(sdata, NULL, skb);
3d34deb6 3993 local_bh_enable();
3b8d81e0 3994}
Linux 6.x block layer and io_uring tree(s)