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