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