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nl80211: add feature for BSS selection support
[deliverable/linux.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
e2ebc74d
JB		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 *
13 * Transmit and frame generation functions.
14 */
15
16#include <linux/kernel.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/etherdevice.h>
20#include <linux/bitmap.h>
d4e46a3d 21#include <linux/rcupdate.h>
bc3b2d7f 22#include <linux/export.h>
881d966b 23#include <net/net_namespace.h>
e2ebc74d
JB		 24#include <net/ieee80211_radiotap.h>
25#include <net/cfg80211.h>
26#include <net/mac80211.h>
27#include <asm/unaligned.h>
28
29#include "ieee80211_i.h"
24487981 30#include "driver-ops.h"
2c8dccc7 31#include "led.h"
33b64eb2 32#include "mesh.h"
e2ebc74d
JB		 33#include "wep.h"
34#include "wpa.h"
35#include "wme.h"
2c8dccc7 36#include "rate.h"
e2ebc74d 37
e2ebc74d
JB		 38/* misc utils */
39
5a490510
JB		 40static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
41{
42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
43
44 u64_stats_update_begin(&tstats->syncp);
45 tstats->tx_packets++;
46 tstats->tx_bytes += len;
47 u64_stats_update_end(&tstats->syncp);
48}
49
252b86c4
JB		 50static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
51 struct sk_buff *skb, int group_addr,
03f93c3d 52 int next_frag_len)
e2ebc74d 53{
2103dec1 54 int rate, mrate, erp, dur, i, shift = 0;
2e92e6f2 55 struct ieee80211_rate *txrate;
e2ebc74d 56 struct ieee80211_local *local = tx->local;
8318d78a 57 struct ieee80211_supported_band *sband;
358c8d9d 58 struct ieee80211_hdr *hdr;
252b86c4 59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2103dec1
SW		 60 struct ieee80211_chanctx_conf *chanctx_conf;
61 u32 rate_flags = 0;
62
63 rcu_read_lock();
64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
65 if (chanctx_conf) {
66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
68 }
69 rcu_read_unlock();
e6a9854b
JB		 70
71 /* assume HW handles this */
336004e2 72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
e6a9854b
JB		 73 return 0;
74
75 /* uh huh? */
0d528d85 76 if (WARN_ON_ONCE(tx->rate.idx < 0))
e6a9854b 77 return 0;
e2ebc74d 78
2d56577b 79 sband = local->hw.wiphy->bands[info->band];
0d528d85 80 txrate = &sband->bitrates[tx->rate.idx];
8318d78a 81
e6a9854b 82 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 83
84 /*
85 * data and mgmt (except PS Poll):
86 * - during CFP: 32768
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
93 *
94 * IEEE 802.11, 9.6:
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
99 * BSSBasicRateSet
100 */
252b86c4 101 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 102 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 103 /* TODO: These control frames are not currently sent by
ccd7b362 104 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 105 * needs to be updated to support duration field calculation.
106 *
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
114 * and its SIFS
115 * PS Poll: BIT(15) | BIT(14) | aid
116 */
117 return 0;
118 }
119
120 /* data/mgmt */
121 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 122 return cpu_to_le16(32768);
e2ebc74d
JB		 123
124 if (group_addr) /* Group address as the destination - no ACK */
125 return 0;
126
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
136 */
137 rate = -1;
8318d78a
JB		 138 /* use lowest available if everything fails */
139 mrate = sband->bitrates[0].bitrate;
140 for (i = 0; i < sband->n_bitrates; i++) {
141 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 142
8318d78a
JB		 143 if (r->bitrate > txrate->bitrate)
144 break;
e2ebc74d 145
2103dec1
SW		 146 if ((rate_flags & r->flags) != rate_flags)
147 continue;
148
bda3933a 149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
2103dec1 150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
8318d78a
JB		 151
152 switch (sband->band) {
153 case IEEE80211_BAND_2GHZ: {
154 u32 flag;
155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
156 flag = IEEE80211_RATE_MANDATORY_G;
157 else
158 flag = IEEE80211_RATE_MANDATORY_B;
159 if (r->flags & flag)
160 mrate = r->bitrate;
161 break;
162 }
163 case IEEE80211_BAND_5GHZ:
164 if (r->flags & IEEE80211_RATE_MANDATORY_A)
165 mrate = r->bitrate;
166 break;
3a0c52a6
VK		 167 case IEEE80211_BAND_60GHZ:
168 /* TODO, for now fall through */
8318d78a
JB		 169 case IEEE80211_NUM_BANDS:
170 WARN_ON(1);
171 break;
172 }
e2ebc74d
JB		 173 }
174 if (rate == -1) {
175 /* No matching basic rate found; use highest suitable mandatory
176 * PHY rate */
2103dec1 177 rate = DIV_ROUND_UP(mrate, 1 << shift);
e2ebc74d
JB		 178 }
179
6674f210
SW		 180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr->frame_control) &&
c26a0e10 182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
6674f210
SW		 183 dur = 0;
184 else
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
4ee73f33 188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
438b61b7
SW		 189 tx->sdata->vif.bss_conf.use_short_preamble,
190 shift);
e2ebc74d
JB		 191
192 if (next_frag_len) {
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
196 /* next fragment */
4ee73f33 197 dur += ieee80211_frame_duration(sband->band, next_frag_len,
8318d78a 198 txrate->bitrate, erp,
438b61b7
SW		 199 tx->sdata->vif.bss_conf.use_short_preamble,
200 shift);
e2ebc74d
JB		 201 }
202
03f93c3d 203 return cpu_to_le16(dur);
e2ebc74d
JB		 204}
205
e2ebc74d 206/* tx handlers */
5c1b98a5
KV		 207static ieee80211_tx_result debug_noinline
208ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
209{
210 struct ieee80211_local *local = tx->local;
0c74211d 211 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 212
213 /* driver doesn't support power save */
30686bf7 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
5c1b98a5
KV		 215 return TX_CONTINUE;
216
217 /* hardware does dynamic power save */
30686bf7 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
5c1b98a5
KV		 219 return TX_CONTINUE;
220
221 /* dynamic power save disabled */
222 if (local->hw.conf.dynamic_ps_timeout <= 0)
223 return TX_CONTINUE;
224
225 /* we are scanning, don't enable power save */
226 if (local->scanning)
227 return TX_CONTINUE;
228
229 if (!local->ps_sdata)
230 return TX_CONTINUE;
231
232 /* No point if we're going to suspend */
233 if (local->quiescing)
234 return TX_CONTINUE;
235
0c74211d
KV		 236 /* dynamic ps is supported only in managed mode */
237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
238 return TX_CONTINUE;
239
240 ifmgd = &tx->sdata->u.mgd;
241
242 /*
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
249 * peer application.
250 *
dc41e4d4 251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
0c74211d
KV		 252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
254 */
4875d30d
JB		 255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
0c74211d
KV		 258 return TX_CONTINUE;
259
5c1b98a5
KV		 260 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
261 ieee80211_stop_queues_by_reason(&local->hw,
445ea4e8 262 IEEE80211_MAX_QUEUE_MAP,
cca07b00
LC		 263 IEEE80211_QUEUE_STOP_REASON_PS,
264 false);
db28569a 265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 266 ieee80211_queue_work(&local->hw,
267 &local->dynamic_ps_disable_work);
268 }
269
5db1c07c
LC		 270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd->associated)
272 return TX_CONTINUE;
273
5c1b98a5
KV		 274 mod_timer(&local->dynamic_ps_timer, jiffies +
275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
276
277 return TX_CONTINUE;
278}
e2ebc74d 279
d9e8a70f 280static ieee80211_tx_result debug_noinline
5cf121c3 281ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 282{
358c8d9d 283
e039fa4a 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 286 bool assoc = false;
e2ebc74d 287
e039fa4a 288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 289 return TX_CONTINUE;
58d4185e 290
b23b025f
BG		 291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 293 !ieee80211_is_probe_req(hdr->frame_control) &&
294 !ieee80211_is_nullfunc(hdr->frame_control))
295 /*
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
303 *
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
305 */
9ae54c84 306 return TX_DROP;
e2ebc74d 307
239281f8
RL		 308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
309 return TX_CONTINUE;
310
1be7fe8d
BJ		 311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
312 return TX_CONTINUE;
313
5cf121c3 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 315 return TX_CONTINUE;
e2ebc74d 316
c2c98fde
JB		 317 if (tx->sta)
318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 319
5cf121c3 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 321 if (unlikely(!assoc &&
358c8d9d 322 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d 323#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0
JB		 324 sdata_info(tx->sdata,
325 "dropped data frame to not associated station %pM\n",
326 hdr->addr1);
327#endif
e2ebc74d 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 329 return TX_DROP;
e2ebc74d 330 }
29623892
JB		 331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
332 ieee80211_is_data(hdr->frame_control) &&
030ef8f8 333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
29623892
JB		 334 /*
335 * No associated STAs - no need to send multicast
336 * frames.
337 */
338 return TX_DROP;
e2ebc74d
JB		 339 }
340
9ae54c84 341 return TX_CONTINUE;
e2ebc74d
JB		 342}
343
e2ebc74d
JB		 344/* This function is called whenever the AP is about to exceed the maximum limit
345 * of buffered frames for power saving STAs. This situation should not really
346 * happen often during normal operation, so dropping the oldest buffered packet
347 * from each queue should be OK to make some room for new frames. */
348static void purge_old_ps_buffers(struct ieee80211_local *local)
349{
350 int total = 0, purged = 0;
351 struct sk_buff *skb;
352 struct ieee80211_sub_if_data *sdata;
353 struct sta_info *sta;
354
79010420 355 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
d012a605
MP		 356 struct ps_data *ps;
357
358 if (sdata->vif.type == NL80211_IFTYPE_AP)
359 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 360 else if (ieee80211_vif_is_mesh(&sdata->vif))
361 ps = &sdata->u.mesh.ps;
d012a605 362 else
e2ebc74d 363 continue;
d012a605
MP		 364
365 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d
JB		 366 if (skb) {
367 purged++;
368 dev_kfree_skb(skb);
369 }
d012a605 370 total += skb_queue_len(&ps->bc_buf);
e2ebc74d 371 }
e2ebc74d 372
948d887d
JB		 373 /*
374 * Drop one frame from each station from the lowest-priority
375 * AC that has frames at all.
376 */
d0709a65 377 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 378 int ac;
379
380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
381 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
382 total += skb_queue_len(&sta->ps_tx_buf[ac]);
383 if (skb) {
384 purged++;
c3e7724b 385 ieee80211_free_txskb(&local->hw, skb);
948d887d
JB		 386 break;
387 }
e2ebc74d 388 }
e2ebc74d 389 }
d0709a65 390
e2ebc74d 391 local->total_ps_buffered = total;
bdcbd8e0 392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
e2ebc74d
JB		 393}
394
9ae54c84 395static ieee80211_tx_result
5cf121c3 396ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 397{
e039fa4a 398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d012a605 400 struct ps_data *ps;
e039fa4a 401
7d54d0dd
JB		 402 /*
403 * broadcast/multicast frame
404 *
3f52b7e3 405 * If any of the associated/peer stations is in power save mode,
7d54d0dd
JB		 406 * the frame is buffered to be sent after DTIM beacon frame.
407 * This is done either by the hardware or us.
408 */
409
3f52b7e3 410 /* powersaving STAs currently only in AP/VLAN/mesh mode */
d012a605
MP		 411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
413 if (!tx->sdata->bss)
414 return TX_CONTINUE;
415
416 ps = &tx->sdata->bss->ps;
3f52b7e3
MP		 417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
418 ps = &tx->sdata->u.mesh.ps;
d012a605 419 } else {
3e122be0 420 return TX_CONTINUE;
d012a605
MP		 421 }
422
3e122be0
JB		 423
424 /* no buffering for ordered frames */
358c8d9d 425 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 426 return TX_CONTINUE;
7d54d0dd 427
08b99399
JB		 428 if (ieee80211_is_probe_req(hdr->frame_control))
429 return TX_CONTINUE;
430
30686bf7 431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
f4d57941
JB		 432 info->hw_queue = tx->sdata->vif.cab_queue;
433
7d54d0dd 434 /* no stations in PS mode */
d012a605 435 if (!atomic_read(&ps->num_sta_ps))
9ae54c84 436 return TX_CONTINUE;
7d54d0dd 437
62b517cb 438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
62b1208e 439
62b517cb 440 /* device releases frame after DTIM beacon */
30686bf7 441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
62b1208e 442 return TX_CONTINUE;
62b1208e 443
7d54d0dd 444 /* buffered in mac80211 */
62b1208e
JB		 445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
446 purge_old_ps_buffers(tx->local);
447
d012a605 448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
bdcbd8e0
JB		 449 ps_dbg(tx->sdata,
450 "BC TX buffer full - dropping the oldest frame\n");
d012a605 451 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
62b1208e
JB		 452 } else
453 tx->local->total_ps_buffered++;
e2ebc74d 454
d012a605 455 skb_queue_tail(&ps->bc_buf, tx->skb);
7d54d0dd 456
62b1208e 457 return TX_QUEUED;
e2ebc74d
JB		 458}
459
fb733336
JM		 460static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
461 struct sk_buff *skb)
462{
463 if (!ieee80211_is_mgmt(fc))
464 return 0;
465
c2c98fde 466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 467 return 0;
468
d8ca16db 469 if (!ieee80211_is_robust_mgmt_frame(skb))
fb733336
JM		 470 return 0;
471
472 return 1;
473}
474
9ae54c84 475static ieee80211_tx_result
5cf121c3 476ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 477{
478 struct sta_info *sta = tx->sta;
e039fa4a 479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
08b99399 480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 481 struct ieee80211_local *local = tx->local;
e2ebc74d 482
02f2f1a9 483 if (unlikely(!sta))
9ae54c84 484 return TX_CONTINUE;
e2ebc74d 485
c2c98fde 486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
5ac2e350
JB		 487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
02f2f1a9 489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
948d887d
JB		 490 int ac = skb_get_queue_mapping(tx->skb);
491
08b99399
JB		 492 if (ieee80211_is_mgmt(hdr->frame_control) &&
493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
495 return TX_CONTINUE;
496 }
497
bdcbd8e0
JB		 498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
499 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d
JB		 500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
501 purge_old_ps_buffers(tx->local);
1d147bfa
EG		 502
503 /* sync with ieee80211_sta_ps_deliver_wakeup */
504 spin_lock(&sta->ps_lock);
505 /*
506 * STA woke up the meantime and all the frames on ps_tx_buf have
507 * been queued to pending queue. No reordering can happen, go
508 * ahead and Tx the packet.
509 */
510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
5ac2e350
JB		 511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
1d147bfa
EG		 513 spin_unlock(&sta->ps_lock);
514 return TX_CONTINUE;
515 }
516
948d887d
JB		 517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
bdcbd8e0
JB		 519 ps_dbg(tx->sdata,
520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
521 sta->sta.addr, ac);
c3e7724b 522 ieee80211_free_txskb(&local->hw, old);
e2ebc74d
JB		 523 } else
524 tx->local->total_ps_buffered++;
004c872e 525
e039fa4a 526 info->control.jiffies = jiffies;
5061b0c2 527 info->control.vif = &tx->sdata->vif;
8f77f384 528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
03c8c06f 529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
948d887d 530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
1d147bfa 531 spin_unlock(&sta->ps_lock);
3393a608
JO		 532
533 if (!timer_pending(&local->sta_cleanup))
534 mod_timer(&local->sta_cleanup,
535 round_jiffies(jiffies +
536 STA_INFO_CLEANUP_INTERVAL));
537
c868cb35
JB		 538 /*
539 * We queued up some frames, so the TIM bit might
540 * need to be set, recalculate it.
541 */
542 sta_info_recalc_tim(sta);
543
9ae54c84 544 return TX_QUEUED;
bdcbd8e0
JB		 545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
546 ps_dbg(tx->sdata,
547 "STA %pM in PS mode, but polling/in SP -> send frame\n",
548 sta->sta.addr);
e2ebc74d 549 }
e2ebc74d 550
9ae54c84 551 return TX_CONTINUE;
e2ebc74d
JB		 552}
553
d9e8a70f 554static ieee80211_tx_result debug_noinline
5cf121c3 555ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 556{
5cf121c3 557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 558 return TX_CONTINUE;
e2ebc74d 559
5cf121c3 560 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 561 return ieee80211_tx_h_unicast_ps_buf(tx);
562 else
563 return ieee80211_tx_h_multicast_ps_buf(tx);
564}
565
a621fa4d
JB		 566static ieee80211_tx_result debug_noinline
567ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
568{
569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
570
af61a165
JB		 571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
572 if (tx->sdata->control_port_no_encrypt)
573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
9c1c98a3 575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
af61a165 576 }
a621fa4d
JB		 577
578 return TX_CONTINUE;
579}
580
d9e8a70f 581static ieee80211_tx_result debug_noinline
5cf121c3 582ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 583{
46e6de15 584 struct ieee80211_key *key;
e039fa4a 585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 587
3b8d81e0 588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 589 tx->key = NULL;
2475b1cc
MS		 590 else if (tx->sta &&
591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
d4e46a3d 592 tx->key = key;
3cfcf6ac 593 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324 594 is_multicast_ether_addr(hdr->addr1) &&
d8ca16db 595 ieee80211_is_robust_mgmt_frame(tx->skb) &&
3cfcf6ac
JM		 596 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
597 tx->key = key;
f7e0104c
JB		 598 else if (is_multicast_ether_addr(hdr->addr1) &&
599 (key = rcu_dereference(tx->sdata->default_multicast_key)))
600 tx->key = key;
601 else if (!is_multicast_ether_addr(hdr->addr1) &&
602 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 603 tx->key = key;
e8f4fb7c 604 else
4922f71f 605 tx->key = NULL;
e2ebc74d
JB		 606
607 if (tx->key) {
813d7669
JB		 608 bool skip_hw = false;
609
011bfcc4 610 /* TODO: add threshold stuff again */
176e4f84 611
97359d12
JB		 612 switch (tx->key->conf.cipher) {
613 case WLAN_CIPHER_SUITE_WEP40:
614 case WLAN_CIPHER_SUITE_WEP104:
97359d12 615 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 616 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 617 tx->key = NULL;
618 break;
97359d12 619 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db 620 case WLAN_CIPHER_SUITE_CCMP_256:
00b9cfa3
JM		 621 case WLAN_CIPHER_SUITE_GCMP:
622 case WLAN_CIPHER_SUITE_GCMP_256:
fb733336
JM		 623 if (!ieee80211_is_data_present(hdr->frame_control) &&
624 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
625 tx->skb))
626 tx->key = NULL;
3b43a187
KV		 627 else
628 skip_hw = (tx->key->conf.flags &
e548c49e 629 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 630 ieee80211_is_mgmt(hdr->frame_control);
fb733336 631 break;
97359d12 632 case WLAN_CIPHER_SUITE_AES_CMAC:
56c52da2 633 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
8ade538b
JM		 634 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
635 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3cfcf6ac
JM		 636 if (!ieee80211_is_mgmt(hdr->frame_control))
637 tx->key = NULL;
638 break;
176e4f84 639 }
813d7669 640
e54faf29
JB		 641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
642 !ieee80211_is_deauth(hdr->frame_control)))
95acac61
JB		 643 return TX_DROP;
644
f12553eb 645 if (!skip_hw && tx->key &&
382b1655 646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 647 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 648 }
649
9ae54c84 650 return TX_CONTINUE;
e2ebc74d
JB		 651}
652
d9e8a70f 653static ieee80211_tx_result debug_noinline
5cf121c3 654ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 655{
e039fa4a 656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 657 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
658 struct ieee80211_supported_band *sband;
a2c40249 659 u32 len;
e6a9854b 660 struct ieee80211_tx_rate_control txrc;
0d528d85 661 struct ieee80211_sta_rates *ratetbl = NULL;
c2c98fde 662 bool assoc = false;
8318d78a 663
e6a9854b 664 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 665
2d56577b 666 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 667
a2c40249 668 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 669 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 670
671 /* set up the tx rate control struct we give the RC algo */
005e472b 672 txrc.hw = &tx->local->hw;
e6a9854b
JB		 673 txrc.sband = sband;
674 txrc.bss_conf = &tx->sdata->vif.bss_conf;
675 txrc.skb = tx->skb;
676 txrc.reported_rate.idx = -1;
2d56577b 677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
37eb0b16
JM		 678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
679 txrc.max_rate_idx = -1;
680 else
681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2ffbe6d3
FF		 682
683 if (tx->sdata->rc_has_mcs_mask[info->band])
684 txrc.rate_idx_mcs_mask =
685 tx->sdata->rc_rateidx_mcs_mask[info->band];
686
8f0729b1 687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
5765f9f6
BVB		 689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
690 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
e6a9854b
JB		 691
692 /* set up RTS protection if desired */
b9a5f8ca 693 if (len > tx->local->hw.wiphy->rts_threshold) {
0d528d85 694 txrc.rts = true;
e2ebc74d 695 }
e2ebc74d 696
0d528d85 697 info->control.use_rts = txrc.rts;
991fec09
FF		 698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
699
e6a9854b
JB		 700 /*
701 * Use short preamble if the BSS can handle it, but not for
702 * management frames unless we know the receiver can handle
703 * that -- the management frame might be to a station that
704 * just wants a probe response.
705 */
706 if (tx->sdata->vif.bss_conf.use_short_preamble &&
707 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
0d528d85
FF		 709 txrc.short_preamble = true;
710
711 info->control.short_preamble = txrc.short_preamble;
e2ebc74d 712
dfdfc2be
SE		 713 /* don't ask rate control when rate already injected via radiotap */
714 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
715 return TX_CONTINUE;
716
c2c98fde
JB		 717 if (tx->sta)
718 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 719
720 /*
721 * Lets not bother rate control if we're associated and cannot
722 * talk to the sta. This should not happen.
723 */
c2c98fde 724 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 725 !rate_usable_index_exists(sband, &tx->sta->sta),
726 "%s: Dropped data frame as no usable bitrate found while "
727 "scanning and associated. Target station: "
728 "%pM on %d GHz band\n",
47846c9b 729 tx->sdata->name, hdr->addr1,
2d56577b 730 info->band ? 5 : 2))
b770b43e 731 return TX_DROP;
2e92e6f2 732
b770b43e
LR		 733 /*
734 * If we're associated with the sta at this point we know we can at
735 * least send the frame at the lowest bit rate.
736 */
e6a9854b
JB		 737 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
738
0d528d85
FF		 739 if (tx->sta && !info->control.skip_table)
740 ratetbl = rcu_dereference(tx->sta->sta.rates);
741
742 if (unlikely(info->control.rates[0].idx < 0)) {
743 if (ratetbl) {
744 struct ieee80211_tx_rate rate = {
745 .idx = ratetbl->rate[0].idx,
746 .flags = ratetbl->rate[0].flags,
747 .count = ratetbl->rate[0].count
748 };
749
750 if (ratetbl->rate[0].idx < 0)
751 return TX_DROP;
752
753 tx->rate = rate;
754 } else {
755 return TX_DROP;
756 }
757 } else {
758 tx->rate = info->control.rates[0];
759 }
e6a9854b 760
c1ce5a74 761 if (txrc.reported_rate.idx < 0) {
0d528d85 762 txrc.reported_rate = tx->rate;
c1ce5a74 763 if (tx->sta && ieee80211_is_data(hdr->frame_control))
e5a9f8d0 764 tx->sta->tx_stats.last_rate = txrc.reported_rate;
c1ce5a74 765 } else if (tx->sta)
e5a9f8d0 766 tx->sta->tx_stats.last_rate = txrc.reported_rate;
e039fa4a 767
0d528d85
FF		 768 if (ratetbl)
769 return TX_CONTINUE;
770
e6a9854b
JB		 771 if (unlikely(!info->control.rates[0].count))
772 info->control.rates[0].count = 1;
e2ebc74d 773
9955151d
GS		 774 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
775 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
776 info->control.rates[0].count = 1;
777
e6a9854b
JB		 778 return TX_CONTINUE;
779}
780
ba8c3d6f
FF		 781static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
782{
783 u16 *seq = &sta->tid_seq[tid];
784 __le16 ret = cpu_to_le16(*seq);
785
786 /* Increase the sequence number. */
787 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
788
789 return ret;
790}
791
f591fa5d
JB		 792static ieee80211_tx_result debug_noinline
793ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
794{
795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
f591fa5d
JB		 797 u8 *qc;
798 int tid;
799
25d834e1
JB		 800 /*
801 * Packet injection may want to control the sequence
802 * number, if we have no matching interface then we
803 * neither assign one ourselves nor ask the driver to.
804 */
5061b0c2 805 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 806 return TX_CONTINUE;
807
f591fa5d
JB		 808 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
809 return TX_CONTINUE;
810
811 if (ieee80211_hdrlen(hdr->frame_control) < 24)
812 return TX_CONTINUE;
813
49a59543
JB		 814 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
815 return TX_CONTINUE;
816
94778280
JB		 817 /*
818 * Anything but QoS data that has a sequence number field
819 * (is long enough) gets a sequence number from the global
c4c205f3
BC		 820 * counter. QoS data frames with a multicast destination
821 * also use the global counter (802.11-2012 9.3.2.10).
94778280 822 */
c4c205f3
BC		 823 if (!ieee80211_is_data_qos(hdr->frame_control) ||
824 is_multicast_ether_addr(hdr->addr1)) {
94778280 825 /* driver should assign sequence number */
f591fa5d 826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 827 /* for pure STA mode without beacons, we can do it */
828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
829 tx->sdata->sequence_number += 0x10;
79c892b8 830 if (tx->sta)
e5a9f8d0 831 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
f591fa5d
JB		 832 return TX_CONTINUE;
833 }
834
835 /*
836 * This should be true for injected/management frames only, for
837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
838 * above since they are not QoS-data frames.
839 */
840 if (!tx->sta)
841 return TX_CONTINUE;
842
843 /* include per-STA, per-TID sequence counter */
844
845 qc = ieee80211_get_qos_ctl(hdr);
846 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
e5a9f8d0 847 tx->sta->tx_stats.msdu[tid]++;
f591fa5d 848
ba8c3d6f
FF		 849 if (!tx->sta->sta.txq[0])
850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
f591fa5d
JB		 851
852 return TX_CONTINUE;
853}
854
252b86c4 855static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 856 struct sk_buff *skb, int hdrlen,
857 int frag_threshold)
858{
252b86c4 859 struct ieee80211_local *local = tx->local;
a1a3fcec 860 struct ieee80211_tx_info *info;
252b86c4 861 struct sk_buff *tmp;
2de8e0d9
JB		 862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
865
866 if (WARN_ON(rem < 0))
867 return -EINVAL;
868
252b86c4
JB		 869 /* first fragment was already added to queue by caller */
870
2de8e0d9
JB		 871 while (rem) {
872 int fraglen = per_fragm;
873
874 if (fraglen > rem)
875 fraglen = rem;
876 rem -= fraglen;
877 tmp = dev_alloc_skb(local->tx_headroom +
878 frag_threshold +
2475b1cc 879 tx->sdata->encrypt_headroom +
2de8e0d9
JB		 880 IEEE80211_ENCRYPT_TAILROOM);
881 if (!tmp)
882 return -ENOMEM;
252b86c4
JB		 883
884 __skb_queue_tail(&tx->skbs, tmp);
885
2475b1cc
MS		 886 skb_reserve(tmp,
887 local->tx_headroom + tx->sdata->encrypt_headroom);
888
2de8e0d9
JB		 889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 891
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
895
896 if (rem)
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898
2de8e0d9
JB		 899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
2de8e0d9 901 tmp->dev = skb->dev;
2de8e0d9
JB		 902
903 /* copy header and data */
904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
906
907 pos += fraglen;
908 }
909
252b86c4 910 /* adjust first fragment's length */
338f977f 911 skb_trim(skb, hdrlen + per_fragm);
2de8e0d9
JB		 912 return 0;
913}
914
d9e8a70f 915static ieee80211_tx_result debug_noinline
e2454948
JB		 916ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917{
2de8e0d9
JB		 918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 922 int hdrlen;
923 int fragnum;
e2454948 924
252b86c4
JB		 925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
927 tx->skb = NULL;
928
a26eb27a
JB		 929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930 return TX_CONTINUE;
931
932 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 933 return TX_CONTINUE;
934
eefce91a
JB		 935 /*
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 937 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 938 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 939 */
8b30b1fe 940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 941 return TX_DROP;
942
065e9605 943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 944
a26eb27a 945 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 947 return TX_DROP;
e6a9854b 948
2de8e0d9
JB		 949 /*
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
956 */
252b86c4 957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 958 return TX_DROP;
e6a9854b 959
2de8e0d9
JB		 960 /* update duration/seq/flags of fragments */
961 fragnum = 0;
252b86c4
JB		 962
963 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 965
2de8e0d9
JB		 966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
e6a9854b 968
252b86c4 969 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 970 hdr->frame_control |= morefrags;
e6a9854b
JB		 971 /*
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
974 */
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
e3e1a0bc 978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 980 } else {
981 hdr->frame_control &= ~morefrags;
e6a9854b 982 }
2de8e0d9
JB		 983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
984 fragnum++;
252b86c4 985 }
e2ebc74d 986
9ae54c84 987 return TX_CONTINUE;
e2ebc74d
JB		 988}
989
feff1f2f
JB		 990static ieee80211_tx_result debug_noinline
991ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
992{
252b86c4 993 struct sk_buff *skb;
560d2682 994 int ac = -1;
feff1f2f
JB		 995
996 if (!tx->sta)
997 return TX_CONTINUE;
998
252b86c4 999 skb_queue_walk(&tx->skbs, skb) {
560d2682 1000 ac = skb_get_queue_mapping(skb);
e5a9f8d0 1001 tx->sta->tx_stats.bytes[ac] += skb->len;
252b86c4 1002 }
560d2682 1003 if (ac >= 0)
e5a9f8d0 1004 tx->sta->tx_stats.packets[ac]++;
feff1f2f
JB		 1005
1006 return TX_CONTINUE;
1007}
1008
d9e8a70f 1009static ieee80211_tx_result debug_noinline
e2454948
JB		 1010ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1011{
1012 if (!tx->key)
1013 return TX_CONTINUE;
1014
97359d12
JB		 1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1018 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1019 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1020 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1021 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx, IEEE80211_CCMP_MIC_LEN);
1024 case WLAN_CIPHER_SUITE_CCMP_256:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_256_MIC_LEN);
97359d12 1027 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1028 return ieee80211_crypto_aes_cmac_encrypt(tx);
56c52da2
JM		 1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
8ade538b
JM		 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx);
00b9cfa3
JM		 1034 case WLAN_CIPHER_SUITE_GCMP:
1035 case WLAN_CIPHER_SUITE_GCMP_256:
1036 return ieee80211_crypto_gcmp_encrypt(tx);
3ffc2a90 1037 default:
d32a1028 1038 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1039 }
1040
e2454948
JB		 1041 return TX_DROP;
1042}
1043
d9e8a70f 1044static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1045ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046{
252b86c4 1047 struct sk_buff *skb;
2de8e0d9
JB		 1048 struct ieee80211_hdr *hdr;
1049 int next_len;
1050 bool group_addr;
03f93c3d 1051
252b86c4 1052 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1053 hdr = (void *) skb->data;
7e0aae47
JM		 1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055 break; /* must not overwrite AID */
252b86c4
JB		 1056 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058 next_len = next->len;
1059 } else
1060 next_len = 0;
2de8e0d9 1061 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1062
2de8e0d9 1063 hdr->duration_id =
252b86c4
JB		 1064 ieee80211_duration(tx, skb, group_addr, next_len);
1065 }
03f93c3d
JB		 1066
1067 return TX_CONTINUE;
1068}
1069
e2ebc74d
JB		 1070/* actual transmit path */
1071
a622ab72
JB		 1072static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073 struct sk_buff *skb,
1074 struct ieee80211_tx_info *info,
1075 struct tid_ampdu_tx *tid_tx,
1076 int tid)
1077{
1078 bool queued = false;
285fa695 1079 bool reset_agg_timer = false;
aa454580 1080 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1081
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1084 reset_agg_timer = true;
0ab33703
JB		 1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086 /*
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1089 */
ba8c3d6f 1090 } else if (!tx->sta->sta.txq[tid]) {
a622ab72
JB		 1091 spin_lock(&tx->sta->lock);
1092 /*
1093 * Need to re-check now, because we may get here
1094 *
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1101 *
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1109 */
40b275b6 1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1111
1112 if (!tid_tx) {
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1116 reset_agg_timer = true;
a622ab72
JB		 1117 } else {
1118 queued = true;
1119 info->control.vif = &tx->sdata->vif;
1120 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
e9de0190
MK		 1121 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
1122 IEEE80211_TX_CTL_NO_PS_BUFFER |
1123 IEEE80211_TX_STATUS_EOSP;
a622ab72 1124 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1125 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1126 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1127 }
1128 spin_unlock(&tx->sta->lock);
aa454580
HS		 1129
1130 if (purge_skb)
c3e7724b 1131 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1132 }
1133
285fa695
NM		 1134 /* reset session timer */
1135 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1136 tid_tx->last_tx = jiffies;
285fa695 1137
a622ab72
JB		 1138 return queued;
1139}
1140
58d4185e
JB		 1141/*
1142 * initialises @tx
7c10770f
JB		 1143 * pass %NULL for the station if unknown, a valid pointer if known
1144 * or an ERR_PTR() if the station is known not to exist
58d4185e 1145 */
9ae54c84 1146static ieee80211_tx_result
3b8d81e0
JB		 1147ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1148 struct ieee80211_tx_data *tx,
7c10770f 1149 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1150{
3b8d81e0 1151 struct ieee80211_local *local = sdata->local;
58d4185e 1152 struct ieee80211_hdr *hdr;
e039fa4a 1153 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1154 int tid;
a622ab72 1155 u8 *qc;
e2ebc74d
JB		 1156
1157 memset(tx, 0, sizeof(*tx));
1158 tx->skb = skb;
e2ebc74d 1159 tx->local = local;
3b8d81e0 1160 tx->sdata = sdata;
252b86c4 1161 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1162
cd8ffc80
JB		 1163 /*
1164 * If this flag is set to true anywhere, and we get here,
1165 * we are doing the needed processing, so remove the flag
1166 * now.
1167 */
1168 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1169
58d4185e
JB		 1170 hdr = (struct ieee80211_hdr *) skb->data;
1171
7c10770f
JB		 1172 if (likely(sta)) {
1173 if (!IS_ERR(sta))
1174 tx->sta = sta;
1175 } else {
1176 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1177 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1178 if (!tx->sta && sdata->wdev.use_4addr)
1179 return TX_DROP;
1180 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1181 IEEE80211_TX_CTL_INJECTED) ||
1182 tx->sdata->control_port_protocol == tx->skb->protocol) {
1183 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1184 }
1185 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1186 tx->sta = sta_info_get(sdata, hdr->addr1);
3f0e0b22 1187 }
58d4185e 1188
cd8ffc80 1189 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1190 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
30686bf7
JB		 1191 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1192 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1193 struct tid_ampdu_tx *tid_tx;
1194
8b30b1fe
S		 1195 qc = ieee80211_get_qos_ctl(hdr);
1196 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1197
a622ab72
JB		 1198 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1199 if (tid_tx) {
1200 bool queued;
cd8ffc80 1201
a622ab72
JB		 1202 queued = ieee80211_tx_prep_agg(tx, skb, info,
1203 tid_tx, tid);
1204
1205 if (unlikely(queued))
1206 return TX_QUEUED;
1207 }
8b30b1fe
S		 1208 }
1209
badffb72 1210 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1211 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1212 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1213 } else
5cf121c3 1214 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1215
a26eb27a
JB		 1216 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1217 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1218 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1219 info->flags & IEEE80211_TX_CTL_AMPDU)
1220 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1221 }
1222
e2ebc74d 1223 if (!tx->sta)
e039fa4a 1224 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1 1225 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
e039fa4a 1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
f7418bc1
FF		 1227 ieee80211_check_fast_xmit(tx->sta);
1228 }
58d4185e 1229
e039fa4a 1230 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1231
9ae54c84 1232 return TX_CONTINUE;
e2ebc74d
JB		 1233}
1234
ba8c3d6f
FF		 1235static void ieee80211_drv_tx(struct ieee80211_local *local,
1236 struct ieee80211_vif *vif,
1237 struct ieee80211_sta *pubsta,
1238 struct sk_buff *skb)
1239{
1240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1241 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1243 struct ieee80211_tx_control control = {
1244 .sta = pubsta,
1245 };
1246 struct ieee80211_txq *txq = NULL;
1247 struct txq_info *txqi;
1248 u8 ac;
1249
1250 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1251 goto tx_normal;
1252
1253 if (!ieee80211_is_data(hdr->frame_control))
1254 goto tx_normal;
1255
1256 if (pubsta) {
1257 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1258
1259 txq = pubsta->txq[tid];
1260 } else if (vif) {
1261 txq = vif->txq;
1262 }
1263
1264 if (!txq)
1265 goto tx_normal;
1266
1267 ac = txq->ac;
1268 txqi = to_txq_info(txq);
1269 atomic_inc(&sdata->txqs_len[ac]);
1270 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1271 netif_stop_subqueue(sdata->dev, ac);
1272
f2ac7e30
MK		 1273 spin_lock_bh(&txqi->queue.lock);
1274 txqi->byte_cnt += skb->len;
1275 __skb_queue_tail(&txqi->queue, skb);
1276 spin_unlock_bh(&txqi->queue.lock);
1277
ba8c3d6f
FF		 1278 drv_wake_tx_queue(local, txqi);
1279
1280 return;
1281
1282tx_normal:
1283 drv_tx(local, &control, skb);
1284}
1285
1286struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1287 struct ieee80211_txq *txq)
1288{
1289 struct ieee80211_local *local = hw_to_local(hw);
1290 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1291 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1292 struct ieee80211_hdr *hdr;
1293 struct sk_buff *skb = NULL;
1294 u8 ac = txq->ac;
1295
1296 spin_lock_bh(&txqi->queue.lock);
1297
1298 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1299 goto out;
1300
1301 skb = __skb_dequeue(&txqi->queue);
1302 if (!skb)
1303 goto out;
1304
f2ac7e30
MK		 1305 txqi->byte_cnt -= skb->len;
1306
ba8c3d6f
FF		 1307 atomic_dec(&sdata->txqs_len[ac]);
1308 if (__netif_subqueue_stopped(sdata->dev, ac))
1309 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1310
1311 hdr = (struct ieee80211_hdr *)skb->data;
1312 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1313 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1314 sta);
1315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1316
1317 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1318 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1319 info->flags |= IEEE80211_TX_CTL_AMPDU;
1320 else
1321 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1322 }
1323
1324out:
1325 spin_unlock_bh(&txqi->queue.lock);
1326
1327 return skb;
1328}
1329EXPORT_SYMBOL(ieee80211_tx_dequeue);
1330
11127e91
JB		 1331static bool ieee80211_tx_frags(struct ieee80211_local *local,
1332 struct ieee80211_vif *vif,
1333 struct ieee80211_sta *sta,
1334 struct sk_buff_head *skbs,
1335 bool txpending)
e2ebc74d 1336{
252b86c4 1337 struct sk_buff *skb, *tmp;
3b8d81e0 1338 unsigned long flags;
e2ebc74d 1339
252b86c4 1340 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1341 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1342 int q = info->hw_queue;
1343
1344#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1345 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1346 __skb_unlink(skb, skbs);
c3e7724b 1347 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1348 continue;
1349 }
1350#endif
3b8d81e0
JB		 1351
1352 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1353 if (local->queue_stop_reasons[q] ||
7bb45683 1354 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1355 if (unlikely(info->flags &
a7679ed5
SF		 1356 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1357 if (local->queue_stop_reasons[q] &
1358 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1359 /*
1360 * Drop off-channel frames if queues
1361 * are stopped for any reason other
1362 * than off-channel operation. Never
1363 * queue them.
1364 */
1365 spin_unlock_irqrestore(
1366 &local->queue_stop_reason_lock,
1367 flags);
1368 ieee80211_purge_tx_queue(&local->hw,
1369 skbs);
1370 return true;
1371 }
1372 } else {
1373
6c17b77b 1374 /*
a7679ed5
SF		 1375 * Since queue is stopped, queue up frames for
1376 * later transmission from the tx-pending
1377 * tasklet when the queue is woken again.
6c17b77b 1378 */
a7679ed5
SF		 1379 if (txpending)
1380 skb_queue_splice_init(skbs,
1381 &local->pending[q]);
1382 else
1383 skb_queue_splice_tail_init(skbs,
1384 &local->pending[q]);
1385
1386 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1387 flags);
1388 return false;
6c17b77b 1389 }
7bb45683 1390 }
3b8d81e0 1391 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1392
11127e91 1393 info->control.vif = vif;
f0e72851 1394
11127e91 1395 __skb_unlink(skb, skbs);
ba8c3d6f 1396 ieee80211_drv_tx(local, vif, sta, skb);
11127e91 1397 }
5061b0c2 1398
11127e91
JB		 1399 return true;
1400}
1401
1402/*
1403 * Returns false if the frame couldn't be transmitted but was queued instead.
1404 */
1405static bool __ieee80211_tx(struct ieee80211_local *local,
1406 struct sk_buff_head *skbs, int led_len,
1407 struct sta_info *sta, bool txpending)
1408{
1409 struct ieee80211_tx_info *info;
1410 struct ieee80211_sub_if_data *sdata;
1411 struct ieee80211_vif *vif;
1412 struct ieee80211_sta *pubsta;
1413 struct sk_buff *skb;
1414 bool result = true;
1415 __le16 fc;
5061b0c2 1416
11127e91
JB		 1417 if (WARN_ON(skb_queue_empty(skbs)))
1418 return true;
ec25acc4 1419
11127e91
JB		 1420 skb = skb_peek(skbs);
1421 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1422 info = IEEE80211_SKB_CB(skb);
1423 sdata = vif_to_sdata(info->control.vif);
1424 if (sta && !sta->uploaded)
1425 sta = NULL;
1426
1427 if (sta)
1428 pubsta = &sta->sta;
1429 else
1430 pubsta = NULL;
1431
1432 switch (sdata->vif.type) {
1433 case NL80211_IFTYPE_MONITOR:
c82b5a74
JB		 1434 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1435 vif = &sdata->vif;
1436 break;
1437 }
4b6f1dd6 1438 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1439 if (sdata) {
4b6f1dd6 1440 vif = &sdata->vif;
3a25a8c8
JB		 1441 info->hw_queue =
1442 vif->hw_queue[skb_get_queue_mapping(skb)];
30686bf7 1443 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
63b4d8b3 1444 ieee80211_purge_tx_queue(&local->hw, skbs);
3a25a8c8
JB		 1445 return true;
1446 } else
4b6f1dd6 1447 vif = NULL;
11127e91
JB		 1448 break;
1449 case NL80211_IFTYPE_AP_VLAN:
1450 sdata = container_of(sdata->bss,
1451 struct ieee80211_sub_if_data, u.ap);
1452 /* fall through */
1453 default:
1454 vif = &sdata->vif;
1455 break;
e2ebc74d 1456 }
2de8e0d9 1457
cb831b53
JB		 1458 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1459 txpending);
11127e91 1460
74e4dbfd 1461 ieee80211_tpt_led_trig_tx(local, fc, led_len);
74e4dbfd 1462
4db4e0a1 1463 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1464
11127e91 1465 return result;
e2ebc74d
JB		 1466}
1467
97b045d6
JB		 1468/*
1469 * Invoke TX handlers, return 0 on success and non-zero if the
1470 * frame was dropped or queued.
1471 */
1472static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1473{
252b86c4 1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1475 ieee80211_tx_result res = TX_DROP;
97b045d6 1476
9aa4aee3
JB		 1477#define CALL_TXH(txh) \
1478 do { \
1479 res = txh(tx); \
1480 if (res != TX_CONTINUE) \
1481 goto txh_done; \
1482 } while (0)
1483
5c1b98a5 1484 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1485 CALL_TXH(ieee80211_tx_h_check_assoc);
1486 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1487 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1488 CALL_TXH(ieee80211_tx_h_select_key);
30686bf7 1489 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
af65cd96 1490 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1491
aa5b5492
JB		 1492 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1493 __skb_queue_tail(&tx->skbs, tx->skb);
1494 tx->skb = NULL;
c6fcf6bc 1495 goto txh_done;
aa5b5492 1496 }
c6fcf6bc
JB		 1497
1498 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1499 CALL_TXH(ieee80211_tx_h_sequence);
1500 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1501 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1502 CALL_TXH(ieee80211_tx_h_stats);
1503 CALL_TXH(ieee80211_tx_h_encrypt);
30686bf7 1504 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
8fd369ee 1505 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1506#undef CALL_TXH
97b045d6 1507
d9e8a70f 1508 txh_done:
97b045d6 1509 if (unlikely(res == TX_DROP)) {
5479d0e7 1510 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1511 if (tx->skb)
c3e7724b 1512 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1513 else
1f98ab7f 1514 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1515 return -1;
1516 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1517 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1518 return -1;
1519 }
1520
1521 return 0;
1522}
1523
06be6b14
FF		 1524bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1525 struct ieee80211_vif *vif, struct sk_buff *skb,
1526 int band, struct ieee80211_sta **sta)
1527{
1528 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1530 struct ieee80211_tx_data tx;
88724a81 1531 struct sk_buff *skb2;
06be6b14 1532
7c10770f 1533 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
06be6b14
FF		 1534 return false;
1535
1536 info->band = band;
1537 info->control.vif = vif;
1538 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1539
1540 if (invoke_tx_handlers(&tx))
1541 return false;
1542
1543 if (sta) {
1544 if (tx.sta)
1545 *sta = &tx.sta->sta;
1546 else
1547 *sta = NULL;
1548 }
1549
88724a81
JB		 1550 /* this function isn't suitable for fragmented data frames */
1551 skb2 = __skb_dequeue(&tx.skbs);
1552 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1553 ieee80211_free_txskb(hw, skb2);
1554 ieee80211_purge_tx_queue(hw, &tx.skbs);
1555 return false;
1556 }
1557
06be6b14
FF		 1558 return true;
1559}
1560EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1561
7bb45683
JB		 1562/*
1563 * Returns false if the frame couldn't be transmitted but was queued instead.
1564 */
1565static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
7c10770f
JB		 1566 struct sta_info *sta, struct sk_buff *skb,
1567 bool txpending)
e2ebc74d 1568{
3b8d81e0 1569 struct ieee80211_local *local = sdata->local;
5cf121c3 1570 struct ieee80211_tx_data tx;
97b045d6 1571 ieee80211_tx_result res_prepare;
e039fa4a 1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1573 bool result = true;
74e4dbfd 1574 int led_len;
e2ebc74d 1575
e2ebc74d
JB		 1576 if (unlikely(skb->len < 10)) {
1577 dev_kfree_skb(skb);
7bb45683 1578 return true;
e2ebc74d
JB		 1579 }
1580
58d4185e 1581 /* initialises tx */
74e4dbfd 1582 led_len = skb->len;
7c10770f 1583 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
e2ebc74d 1584
cd8ffc80 1585 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1586 ieee80211_free_txskb(&local->hw, skb);
55de908a 1587 return true;
cd8ffc80 1588 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1589 return true;
e2ebc74d
JB		 1590 }
1591
3a25a8c8
JB		 1592 /* set up hw_queue value early */
1593 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
30686bf7 1594 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3a25a8c8
JB		 1595 info->hw_queue =
1596 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1597
7bb45683 1598 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1599 result = __ieee80211_tx(local, &tx.skbs, led_len,
1600 tx.sta, txpending);
55de908a 1601
7bb45683 1602 return result;
e2ebc74d
JB		 1603}
1604
1605/* device xmit handlers */
1606
3bff1865 1607static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1608 struct sk_buff *skb,
1609 int head_need, bool may_encrypt)
1610{
3bff1865 1611 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1612 int tail_need = 0;
1613
3bff1865 1614 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1615 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1616 tail_need -= skb_tailroom(skb);
1617 tail_need = max_t(int, tail_need, 0);
1618 }
1619
c70f59a2 1620 if (skb_cloned(skb) &&
30686bf7 1621 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
c70f59a2 1622 !skb_clone_writable(skb, ETH_HLEN) ||
17c18bf8 1623 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
23c0752a 1624 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1625 else if (head_need || tail_need)
23c0752a 1626 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1627 else
1628 return 0;
23c0752a
JB		 1629
1630 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1631 wiphy_debug(local->hw.wiphy,
1632 "failed to reallocate TX buffer\n");
23c0752a
JB		 1633 return -ENOMEM;
1634 }
1635
23c0752a
JB		 1636 return 0;
1637}
1638
7c10770f
JB		 1639void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1640 struct sta_info *sta, struct sk_buff *skb)
e2ebc74d 1641{
3b8d81e0 1642 struct ieee80211_local *local = sdata->local;
e039fa4a 1643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1645 int headroom;
23c0752a 1646 bool may_encrypt;
e2ebc74d 1647
3b8d81e0 1648 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1649
3b8d81e0 1650 headroom = local->tx_headroom;
23c0752a 1651 if (may_encrypt)
2475b1cc 1652 headroom += sdata->encrypt_headroom;
23c0752a
JB		 1653 headroom -= skb_headroom(skb);
1654 headroom = max_t(int, 0, headroom);
1655
3bff1865 1656 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1657 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1658 return;
e2ebc74d
JB		 1659 }
1660
740c1aa3 1661 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1662 info->control.vif = &sdata->vif;
e2ebc74d 1663
3f52b7e3
MP		 1664 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1665 if (ieee80211_is_data(hdr->frame_control) &&
1666 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1667 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1668 return; /* skb queued: don't free */
1669 } else {
1670 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1671 }
98aed9fd 1672 }
cca89496 1673
2154c81c 1674 ieee80211_set_qos_hdr(sdata, skb);
7c10770f 1675 ieee80211_tx(sdata, sta, skb, false);
e2ebc74d
JB		 1676}
1677
dfdfc2be
SE		 1678static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1679 struct sk_buff *skb)
73b9f03a
JB		 1680{
1681 struct ieee80211_radiotap_iterator iterator;
1682 struct ieee80211_radiotap_header *rthdr =
1683 (struct ieee80211_radiotap_header *) skb->data;
1684 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
dfdfc2be
SE		 1685 struct ieee80211_supported_band *sband =
1686 local->hw.wiphy->bands[info->band];
73b9f03a
JB		 1687 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1688 NULL);
1689 u16 txflags;
dfdfc2be
SE		 1690 u16 rate = 0;
1691 bool rate_found = false;
1692 u8 rate_retries = 0;
1693 u16 rate_flags = 0;
1694 u8 mcs_known, mcs_flags;
646e76bb
LB		 1695 u16 vht_known;
1696 u8 vht_mcs = 0, vht_nss = 0;
dfdfc2be 1697 int i;
73b9f03a
JB		 1698
1699 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1700 IEEE80211_TX_CTL_DONTFRAG;
1701
1702 /*
1703 * for every radiotap entry that is present
1704 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1705 * entries present, or -EINVAL on error)
1706 */
1707
1708 while (!ret) {
1709 ret = ieee80211_radiotap_iterator_next(&iterator);
1710
1711 if (ret)
1712 continue;
1713
1714 /* see if this argument is something we can use */
1715 switch (iterator.this_arg_index) {
1716 /*
1717 * You must take care when dereferencing iterator.this_arg
1718 * for multibyte types... the pointer is not aligned. Use
1719 * get_unaligned((type *)iterator.this_arg) to dereference
1720 * iterator.this_arg for type "type" safely on all arches.
1721 */
1722 case IEEE80211_RADIOTAP_FLAGS:
1723 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1724 /*
1725 * this indicates that the skb we have been
1726 * handed has the 32-bit FCS CRC at the end...
1727 * we should react to that by snipping it off
1728 * because it will be recomputed and added
1729 * on transmission
1730 */
1731 if (skb->len < (iterator._max_length + FCS_LEN))
1732 return false;
1733
1734 skb_trim(skb, skb->len - FCS_LEN);
1735 }
1736 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1737 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1738 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1739 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1740 break;
1741
1742 case IEEE80211_RADIOTAP_TX_FLAGS:
1743 txflags = get_unaligned_le16(iterator.this_arg);
1744 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1745 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1746 break;
1747
dfdfc2be
SE		 1748 case IEEE80211_RADIOTAP_RATE:
1749 rate = *iterator.this_arg;
1750 rate_flags = 0;
1751 rate_found = true;
1752 break;
1753
1754 case IEEE80211_RADIOTAP_DATA_RETRIES:
1755 rate_retries = *iterator.this_arg;
1756 break;
1757
1758 case IEEE80211_RADIOTAP_MCS:
1759 mcs_known = iterator.this_arg[0];
1760 mcs_flags = iterator.this_arg[1];
1761 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
1762 break;
1763
1764 rate_found = true;
1765 rate = iterator.this_arg[2];
1766 rate_flags = IEEE80211_TX_RC_MCS;
1767
1768 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
1769 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
1770 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1771
1772 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
1773 mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40)
1774 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1775 break;
1776
646e76bb
LB		 1777 case IEEE80211_RADIOTAP_VHT:
1778 vht_known = get_unaligned_le16(iterator.this_arg);
1779 rate_found = true;
1780
1781 rate_flags = IEEE80211_TX_RC_VHT_MCS;
1782 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
1783 (iterator.this_arg[2] &
1784 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
1785 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1786 if (vht_known &
1787 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
1788 if (iterator.this_arg[3] == 1)
1789 rate_flags |=
1790 IEEE80211_TX_RC_40_MHZ_WIDTH;
1791 else if (iterator.this_arg[3] == 4)
1792 rate_flags |=
1793 IEEE80211_TX_RC_80_MHZ_WIDTH;
1794 else if (iterator.this_arg[3] == 11)
1795 rate_flags |=
1796 IEEE80211_TX_RC_160_MHZ_WIDTH;
1797 }
1798
1799 vht_mcs = iterator.this_arg[4] >> 4;
1800 vht_nss = iterator.this_arg[4] & 0xF;
1801 break;
1802
73b9f03a
JB		 1803 /*
1804 * Please update the file
1805 * Documentation/networking/mac80211-injection.txt
1806 * when parsing new fields here.
1807 */
1808
1809 default:
1810 break;
1811 }
1812 }
1813
1814 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1815 return false;
1816
dfdfc2be
SE		 1817 if (rate_found) {
1818 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
1819
1820 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
1821 info->control.rates[i].idx = -1;
1822 info->control.rates[i].flags = 0;
1823 info->control.rates[i].count = 0;
1824 }
1825
1826 if (rate_flags & IEEE80211_TX_RC_MCS) {
1827 info->control.rates[0].idx = rate;
646e76bb
LB		 1828 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
1829 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
1830 vht_nss);
dfdfc2be
SE		 1831 } else {
1832 for (i = 0; i < sband->n_bitrates; i++) {
1833 if (rate * 5 != sband->bitrates[i].bitrate)
1834 continue;
1835
1836 info->control.rates[0].idx = i;
1837 break;
1838 }
1839 }
1840
1841 info->control.rates[0].flags = rate_flags;
1842 info->control.rates[0].count = min_t(u8, rate_retries + 1,
1843 local->hw.max_rate_tries);
1844 }
1845
73b9f03a
JB		 1846 /*
1847 * remove the radiotap header
1848 * iterator->_max_length was sanity-checked against
1849 * skb->len by iterator init
1850 */
1851 skb_pull(skb, iterator._max_length);
1852
1853 return true;
1854}
1855
d0cf9c0d
SH		 1856netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1857 struct net_device *dev)
e2ebc74d
JB		 1858{
1859 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a 1860 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d
JB		 1861 struct ieee80211_radiotap_header *prthdr =
1862 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1863 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1864 struct ieee80211_hdr *hdr;
5d9cf4a5 1865 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
b4932836 1866 struct cfg80211_chan_def *chandef;
9b8a74e3 1867 u16 len_rthdr;
5d9cf4a5 1868 int hdrlen;
e2ebc74d 1869
9b8a74e3
AG		 1870 /* check for not even having the fixed radiotap header part */
1871 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1872 goto fail; /* too short to be possibly valid */
1873
1874 /* is it a header version we can trust to find length from? */
1875 if (unlikely(prthdr->it_version))
1876 goto fail; /* only version 0 is supported */
1877
1878 /* then there must be a radiotap header with a length we can use */
1879 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1880
1881 /* does the skb contain enough to deliver on the alleged length? */
1882 if (unlikely(skb->len < len_rthdr))
1883 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1884
e2ebc74d
JB		 1885 /*
1886 * fix up the pointers accounting for the radiotap
1887 * header still being in there. We are being given
1888 * a precooked IEEE80211 header so no need for
1889 * normal processing
1890 */
9b8a74e3 1891 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1892 /*
9b8a74e3
AG		 1893 * these are just fixed to the end of the rt area since we
1894 * don't have any better information and at this point, nobody cares
e2ebc74d 1895 */
9b8a74e3
AG		 1896 skb_set_network_header(skb, len_rthdr);
1897 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1898
5d9cf4a5
JB		 1899 if (skb->len < len_rthdr + 2)
1900 goto fail;
1901
1902 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1903 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1904
1905 if (skb->len < len_rthdr + hdrlen)
1906 goto fail;
1907
f75f5c6f
HS		 1908 /*
1909 * Initialize skb->protocol if the injected frame is a data frame
1910 * carrying a rfc1042 header
1911 */
5d9cf4a5
JB		 1912 if (ieee80211_is_data(hdr->frame_control) &&
1913 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1914 u8 *payload = (u8 *)hdr + hdrlen;
1915
b203ca39 1916 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1917 skb->protocol = cpu_to_be16((payload[6] << 8) |
1918 payload[7]);
f75f5c6f
HS		 1919 }
1920
3b8d81e0
JB		 1921 memset(info, 0, sizeof(*info));
1922
5d9cf4a5 1923 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1924 IEEE80211_TX_CTL_INJECTED;
1925
5d9cf4a5
JB		 1926 rcu_read_lock();
1927
1928 /*
1929 * We process outgoing injected frames that have a local address
1930 * we handle as though they are non-injected frames.
1931 * This code here isn't entirely correct, the local MAC address
1932 * isn't always enough to find the interface to use; for proper
1933 * VLAN/WDS support we will need a different mechanism (which
1934 * likely isn't going to be monitor interfaces).
1935 */
1936 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1937
1938 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1939 if (!ieee80211_sdata_running(tmp_sdata))
1940 continue;
1941 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1942 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1943 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1944 continue;
b203ca39 1945 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1946 sdata = tmp_sdata;
1947 break;
1948 }
1949 }
7351c6bd 1950
55de908a
JB		 1951 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1952 if (!chanctx_conf) {
1953 tmp_sdata = rcu_dereference(local->monitor_sdata);
1954 if (tmp_sdata)
1955 chanctx_conf =
1956 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1957 }
55de908a 1958
b4a7ff75 1959 if (chanctx_conf)
b4932836 1960 chandef = &chanctx_conf->def;
b4a7ff75 1961 else if (!local->use_chanctx)
b4932836 1962 chandef = &local->_oper_chandef;
b4a7ff75
FF		 1963 else
1964 goto fail_rcu;
55de908a
JB		 1965
1966 /*
1967 * Frame injection is not allowed if beaconing is not allowed
1968 * or if we need radar detection. Beaconing is usually not allowed when
1969 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1970 * Passive scan is also used in world regulatory domains where
1971 * your country is not known and as such it should be treated as
1972 * NO TX unless the channel is explicitly allowed in which case
1973 * your current regulatory domain would not have the passive scan
1974 * flag.
1975 *
1976 * Since AP mode uses monitor interfaces to inject/TX management
1977 * frames we can make AP mode the exception to this rule once it
1978 * supports radar detection as its implementation can deal with
1979 * radar detection by itself. We can do that later by adding a
1980 * monitor flag interfaces used for AP support.
1981 */
b4932836
JD		 1982 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1983 sdata->vif.type))
55de908a
JB		 1984 goto fail_rcu;
1985
73c4e195 1986 info->band = chandef->chan->band;
109843b0
LB		 1987
1988 /* process and remove the injection radiotap header */
1989 if (!ieee80211_parse_tx_radiotap(local, skb))
1990 goto fail_rcu;
1991
7c10770f 1992 ieee80211_xmit(sdata, NULL, skb);
5d9cf4a5
JB		 1993 rcu_read_unlock();
1994
e2ebc74d 1995 return NETDEV_TX_OK;
9b8a74e3 1996
55de908a
JB		 1997fail_rcu:
1998 rcu_read_unlock();
9b8a74e3
AG		 1999fail:
2000 dev_kfree_skb(skb);
2001 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 2002}
2003
97ffe757 2004static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
ad38bfc9 2005{
97ffe757 2006 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
ad38bfc9 2007
97ffe757
JB		 2008 return ethertype == ETH_P_TDLS &&
2009 skb->len > 14 &&
2010 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2011}
2012
2013static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2014 struct sk_buff *skb,
2015 struct sta_info **sta_out)
2016{
2017 struct sta_info *sta;
2018
2019 switch (sdata->vif.type) {
2020 case NL80211_IFTYPE_AP_VLAN:
2021 sta = rcu_dereference(sdata->u.vlan.sta);
2022 if (sta) {
2023 *sta_out = sta;
2024 return 0;
2025 } else if (sdata->wdev.use_4addr) {
2026 return -ENOLINK;
2027 }
2028 /* fall through */
2029 case NL80211_IFTYPE_AP:
2030 case NL80211_IFTYPE_OCB:
2031 case NL80211_IFTYPE_ADHOC:
2032 if (is_multicast_ether_addr(skb->data)) {
2033 *sta_out = ERR_PTR(-ENOENT);
2034 return 0;
2035 }
2036 sta = sta_info_get_bss(sdata, skb->data);
2037 break;
2038 case NL80211_IFTYPE_WDS:
2039 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2040 break;
2041#ifdef CONFIG_MAC80211_MESH
2042 case NL80211_IFTYPE_MESH_POINT:
2043 /* determined much later */
2044 *sta_out = NULL;
2045 return 0;
2046#endif
2047 case NL80211_IFTYPE_STATION:
2048 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2049 sta = sta_info_get(sdata, skb->data);
2050 if (sta) {
2051 bool tdls_peer, tdls_auth;
2052
2053 tdls_peer = test_sta_flag(sta,
2054 WLAN_STA_TDLS_PEER);
2055 tdls_auth = test_sta_flag(sta,
2056 WLAN_STA_TDLS_PEER_AUTH);
2057
2058 if (tdls_peer && tdls_auth) {
2059 *sta_out = sta;
2060 return 0;
2061 }
2062
2063 /*
2064 * TDLS link during setup - throw out frames to
2065 * peer. Allow TDLS-setup frames to unauthorized
2066 * peers for the special case of a link teardown
2067 * after a TDLS sta is removed due to being
2068 * unreachable.
2069 */
2070 if (tdls_peer && !tdls_auth &&
2071 !ieee80211_is_tdls_setup(skb))
2072 return -EINVAL;
2073 }
2074
2075 }
2076
2077 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2078 if (!sta)
2079 return -ENOLINK;
2080 break;
2081 default:
2082 return -EINVAL;
2083 }
2084
2085 *sta_out = sta ?: ERR_PTR(-ENOENT);
2086 return 0;
ad38bfc9
MG		 2087}
2088
e2ebc74d 2089/**
4c9451ed
JB		 2090 * ieee80211_build_hdr - build 802.11 header in the given frame
2091 * @sdata: virtual interface to build the header for
2092 * @skb: the skb to build the header in
24d342c5 2093 * @info_flags: skb flags to set
e2ebc74d 2094 *
4c9451ed
JB		 2095 * This function takes the skb with 802.3 header and reformats the header to
2096 * the appropriate IEEE 802.11 header based on which interface the packet is
2097 * being transmitted on.
2098 *
2099 * Note that this function also takes care of the TX status request and
2100 * potential unsharing of the SKB - this needs to be interleaved with the
2101 * header building.
e2ebc74d 2102 *
4c9451ed
JB		 2103 * The function requires the read-side RCU lock held
2104 *
2105 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
e2ebc74d 2106 */
4c9451ed 2107static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
7c10770f 2108 struct sk_buff *skb, u32 info_flags,
97ffe757 2109 struct sta_info *sta)
e2ebc74d 2110{
133b8226 2111 struct ieee80211_local *local = sdata->local;
489ee919 2112 struct ieee80211_tx_info *info;
dcf33963 2113 int head_need;
065e9605
HH		 2114 u16 ethertype, hdrlen, meshhdrlen = 0;
2115 __le16 fc;
e2ebc74d 2116 struct ieee80211_hdr hdr;
ff67bb86 2117 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 2118 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 2119 const u8 *encaps_data;
2120 int encaps_len, skip_header_bytes;
e8bf9649 2121 int nh_pos, h_pos;
97ffe757
JB		 2122 bool wme_sta = false, authorized = false;
2123 bool tdls_peer;
a729cff8 2124 bool multicast;
a729cff8 2125 u16 info_id = 0;
55de908a
JB		 2126 struct ieee80211_chanctx_conf *chanctx_conf;
2127 struct ieee80211_sub_if_data *ap_sdata;
2128 enum ieee80211_band band;
4c9451ed 2129 int ret;
e2ebc74d 2130
97ffe757
JB		 2131 if (IS_ERR(sta))
2132 sta = NULL;
2133
e2ebc74d
JB		 2134 /* convert Ethernet header to proper 802.11 header (based on
2135 * operation mode) */
2136 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 2137 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 2138
51fb61e7 2139 switch (sdata->vif.type) {
05c914fe 2140 case NL80211_IFTYPE_AP_VLAN:
97ffe757 2141 if (sdata->wdev.use_4addr) {
f14543ee
FF		 2142 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2143 /* RA TA DA SA */
2144 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 2145 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2146 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2147 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2148 hdrlen = 30;
c2c98fde 2149 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
a74a8c84 2150 wme_sta = sta->sta.wme;
f14543ee 2151 }
55de908a
JB		 2152 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2153 u.ap);
2154 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
4c9451ed
JB		 2155 if (!chanctx_conf) {
2156 ret = -ENOTCONN;
2157 goto free;
2158 }
4bf88530 2159 band = chanctx_conf->def.chan->band;
97ffe757 2160 if (sdata->wdev.use_4addr)
f14543ee
FF		 2161 break;
2162 /* fall through */
2163 case NL80211_IFTYPE_AP:
fe80123d
AB		 2164 if (sdata->vif.type == NL80211_IFTYPE_AP)
2165 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2166 if (!chanctx_conf) {
2167 ret = -ENOTCONN;
2168 goto free;
2169 }
065e9605 2170 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 2171 /* DA BSSID SA */
2172 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 2173 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2174 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2175 hdrlen = 24;
4bf88530 2176 band = chanctx_conf->def.chan->band;
cf966838 2177 break;
05c914fe 2178 case NL80211_IFTYPE_WDS:
065e9605 2179 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 2180 /* RA TA DA SA */
2181 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 2182 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 2183 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2184 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2185 hdrlen = 30;
55de908a
JB		 2186 /*
2187 * This is the exception! WDS style interfaces are prohibited
2188 * when channel contexts are in used so this must be valid
2189 */
675a0b04 2190 band = local->hw.conf.chandef.chan->band;
cf966838 2191 break;
33b64eb2 2192#ifdef CONFIG_MAC80211_MESH
05c914fe 2193 case NL80211_IFTYPE_MESH_POINT:
b8bacc18 2194 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 2195 struct sta_info *next_hop;
2196 bool mpp_lookup = true;
2197
bf7cd94d 2198 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 2199 if (mpath) {
2200 mpp_lookup = false;
2201 next_hop = rcu_dereference(mpath->next_hop);
2202 if (!next_hop ||
2203 !(mpath->flags & (MESH_PATH_ACTIVE |
2204 MESH_PATH_RESOLVING)))
2205 mpp_lookup = true;
2206 }
2207
ab1c7906 2208 if (mpp_lookup) {
bf7cd94d 2209 mppath = mpp_path_lookup(sdata, skb->data);
ab1c7906
HR		 2210 if (mppath)
2211 mppath->exp_time = jiffies;
2212 }
163df6cf
CYY		 2213
2214 if (mppath && mpath)
2bdaf386 2215 mesh_path_del(sdata, mpath->dst);
b8bacc18 2216 }
79617dee 2217
f76b57b4 2218 /*
9d52501b
JF		 2219 * Use address extension if it is a packet from
2220 * another interface or if we know the destination
2221 * is being proxied by a portal (i.e. portal address
2222 * differs from proxied address)
f76b57b4 2223 */
b203ca39
JP		 2224 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2225 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 2226 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2227 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 2228 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2229 NULL, NULL);
79617dee 2230 } else {
27f01124
TP		 2231 /* DS -> MBSS (802.11-2012 13.11.3.3).
2232 * For unicast with unknown forwarding information,
2233 * destination might be in the MBSS or if that fails
2234 * forwarded to another mesh gate. In either case
2235 * resolution will be handled in ieee80211_xmit(), so
2236 * leave the original DA. This also works for mcast */
2237 const u8 *mesh_da = skb->data;
2238
2239 if (mppath)
2240 mesh_da = mppath->mpp;
2241 else if (mpath)
2242 mesh_da = mpath->dst;
79617dee 2243
3c5772a5 2244 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 2245 mesh_da, sdata->vif.addr);
27f01124
TP		 2246 if (is_multicast_ether_addr(mesh_da))
2247 /* DA TA mSA AE:SA */
bf7cd94d
JB		 2248 meshhdrlen = ieee80211_new_mesh_header(
2249 sdata, &mesh_hdr,
2250 skb->data + ETH_ALEN, NULL);
3c5772a5 2251 else
27f01124 2252 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 2253 meshhdrlen = ieee80211_new_mesh_header(
2254 sdata, &mesh_hdr, skb->data,
2255 skb->data + ETH_ALEN);
79617dee 2256
79617dee 2257 }
55de908a 2258 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2259 if (!chanctx_conf) {
2260 ret = -ENOTCONN;
2261 goto free;
2262 }
4bf88530 2263 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 2264 break;
2265#endif
05c914fe 2266 case NL80211_IFTYPE_STATION:
97ffe757
JB		 2267 /* we already did checks when looking up the RA STA */
2268 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
941c93cd 2269
97ffe757 2270 if (tdls_peer) {
941c93cd
AN		 2271 /* DA SA BSSID */
2272 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2273 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2274 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2275 hdrlen = 24;
2276 } else if (sdata->u.mgd.use_4addr &&
2277 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2278 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2279 IEEE80211_FCTL_TODS);
f14543ee 2280 /* RA TA DA SA */
941c93cd 2281 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 2282 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 2283 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2284 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2285 hdrlen = 30;
2286 } else {
2287 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2288 /* BSSID SA DA */
941c93cd 2289 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 2290 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2291 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2292 hdrlen = 24;
2293 }
55de908a 2294 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2295 if (!chanctx_conf) {
2296 ret = -ENOTCONN;
2297 goto free;
2298 }
4bf88530 2299 band = chanctx_conf->def.chan->band;
cf966838 2300 break;
239281f8
RL		 2301 case NL80211_IFTYPE_OCB:
2302 /* DA SA BSSID */
2303 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2304 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2305 eth_broadcast_addr(hdr.addr3);
2306 hdrlen = 24;
2307 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2308 if (!chanctx_conf) {
2309 ret = -ENOTCONN;
2310 goto free;
2311 }
239281f8
RL		 2312 band = chanctx_conf->def.chan->band;
2313 break;
05c914fe 2314 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 2315 /* DA SA BSSID */
2316 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2317 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 2318 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 2319 hdrlen = 24;
55de908a 2320 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4c9451ed
JB		 2321 if (!chanctx_conf) {
2322 ret = -ENOTCONN;
2323 goto free;
2324 }
4bf88530 2325 band = chanctx_conf->def.chan->band;
cf966838
JB		 2326 break;
2327 default:
4c9451ed
JB		 2328 ret = -EINVAL;
2329 goto free;
e2ebc74d
JB		 2330 }
2331
a729cff8 2332 multicast = is_multicast_ether_addr(hdr.addr1);
e2ebc74d 2333
97ffe757
JB		 2334 /* sta is always NULL for mesh */
2335 if (sta) {
2336 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2337 wme_sta = sta->sta.wme;
2338 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2339 /* For mesh, the use of the QoS header is mandatory */
c2c98fde 2340 wme_sta = true;
97ffe757 2341 }
4777be41 2342
527871d7
JB		 2343 /* receiver does QoS (which also means we do) use it */
2344 if (wme_sta) {
065e9605 2345 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 2346 hdrlen += 2;
2347 }
2348
2349 /*
238814fd
JB		 2350 * Drop unicast frames to unauthorised stations unless they are
2351 * EAPOL frames from the local station.
ce3edf6d 2352 */
55182e4a 2353 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
239281f8 2354 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
a6ececf4 2355 !multicast && !authorized &&
55182e4a 2356 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 2357 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 2358#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 2359 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
4c9451ed 2360 sdata->name, hdr.addr1);
ce3edf6d
JB		 2361#endif
2362
2363 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2364
4c9451ed
JB		 2365 ret = -EPERM;
2366 goto free;
ce3edf6d
JB		 2367 }
2368
a729cff8
JB		 2369 if (unlikely(!multicast && skb->sk &&
2370 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
bf7fa551 2371 struct sk_buff *ack_skb = skb_clone_sk(skb);
a729cff8 2372
bf7fa551 2373 if (ack_skb) {
a729cff8 2374 unsigned long flags;
9475af6e 2375 int id;
a729cff8
JB		 2376
2377 spin_lock_irqsave(&local->ack_status_lock, flags);
bf7fa551 2378 id = idr_alloc(&local->ack_status_frames, ack_skb,
9475af6e 2379 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2380 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2381
9475af6e 2382 if (id >= 0) {
a729cff8
JB		 2383 info_id = id;
2384 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
a729cff8 2385 } else {
bf7fa551 2386 kfree_skb(ack_skb);
a729cff8 2387 }
a729cff8
JB		 2388 }
2389 }
2390
7e244707
HS		 2391 /*
2392 * If the skb is shared we need to obtain our own copy.
2393 */
2394 if (skb_shared(skb)) {
a729cff8
JB		 2395 struct sk_buff *tmp_skb = skb;
2396
2397 /* can't happen -- skb is a clone if info_id != 0 */
2398 WARN_ON(info_id);
2399
f8a0a781 2400 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2401 kfree_skb(tmp_skb);
2402
4c9451ed
JB		 2403 if (!skb) {
2404 ret = -ENOMEM;
2405 goto free;
2406 }
7e244707
HS		 2407 }
2408
065e9605 2409 hdr.frame_control = fc;
e2ebc74d
JB		 2410 hdr.duration_id = 0;
2411 hdr.seq_ctrl = 0;
2412
2413 skip_header_bytes = ETH_HLEN;
2414 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2415 encaps_data = bridge_tunnel_header;
2416 encaps_len = sizeof(bridge_tunnel_header);
2417 skip_header_bytes -= 2;
e5c5d22e 2418 } else if (ethertype >= ETH_P_802_3_MIN) {
e2ebc74d
JB		 2419 encaps_data = rfc1042_header;
2420 encaps_len = sizeof(rfc1042_header);
2421 skip_header_bytes -= 2;
2422 } else {
2423 encaps_data = NULL;
2424 encaps_len = 0;
2425 }
2426
7e244707
HS		 2427 nh_pos = skb_network_header(skb) - skb->data;
2428 h_pos = skb_transport_header(skb) - skb->data;
2429
e2ebc74d
JB		 2430 skb_pull(skb, skip_header_bytes);
2431 nh_pos -= skip_header_bytes;
2432 h_pos -= skip_header_bytes;
2433
23c0752a 2434 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2435
23c0752a
JB		 2436 /*
2437 * So we need to modify the skb header and hence need a copy of
2438 * that. The head_need variable above doesn't, so far, include
2439 * the needed header space that we don't need right away. If we
2440 * can, then we don't reallocate right now but only after the
2441 * frame arrives at the master device (if it does...)
2442 *
2443 * If we cannot, however, then we will reallocate to include all
2444 * the ever needed space. Also, if we need to reallocate it anyway,
2445 * make it big enough for everything we may ever need.
2446 */
e2ebc74d 2447
3a5be7d4 2448 if (head_need > 0 || skb_cloned(skb)) {
2475b1cc 2449 head_need += sdata->encrypt_headroom;
23c0752a
JB		 2450 head_need += local->tx_headroom;
2451 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2452 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2453 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2454 skb = NULL;
4c9451ed 2455 return ERR_PTR(-ENOMEM);
c3e7724b 2456 }
e2ebc74d
JB		 2457 }
2458
2459 if (encaps_data) {
2460 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2461 nh_pos += encaps_len;
2462 h_pos += encaps_len;
2463 }
c29b9b9b 2464
e4ab7eb0 2465#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2466 if (meshhdrlen > 0) {
2467 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2468 nh_pos += meshhdrlen;
2469 h_pos += meshhdrlen;
2470 }
e4ab7eb0 2471#endif
33b64eb2 2472
065e9605 2473 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2474 __le16 *qos_control;
2475
f359d3fe 2476 qos_control = (__le16 *) skb_push(skb, 2);
c29b9b9b
JB		 2477 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2478 /*
2479 * Maybe we could actually set some fields here, for now just
2480 * initialise to zero to indicate no special operation.
2481 */
2482 *qos_control = 0;
2483 } else
2484 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2485
e2ebc74d
JB		 2486 nh_pos += hdrlen;
2487 h_pos += hdrlen;
2488
e2ebc74d
JB		 2489 /* Update skb pointers to various headers since this modified frame
2490 * is going to go through Linux networking code that may potentially
2491 * need things like pointer to IP header. */
d57a544d 2492 skb_reset_mac_header(skb);
e2ebc74d
JB		 2493 skb_set_network_header(skb, nh_pos);
2494 skb_set_transport_header(skb, h_pos);
2495
489ee919 2496 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2497 memset(info, 0, sizeof(*info));
2498
a729cff8
JB		 2499 info->flags = info_flags;
2500 info->ack_frame_id = info_id;
73c4e195 2501 info->band = band;
a729cff8 2502
4c9451ed
JB		 2503 return skb;
2504 free:
2505 kfree_skb(skb);
2506 return ERR_PTR(ret);
2507}
2508
17c18bf8
JB		 2509/*
2510 * fast-xmit overview
2511 *
2512 * The core idea of this fast-xmit is to remove per-packet checks by checking
2513 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2514 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2515 * much less work can be done per packet. For example, fragmentation must be
2516 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2517 * in the code here.
2518 *
2519 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2520 * header and other data to aid packet processing in ieee80211_xmit_fast().
2521 *
2522 * The most difficult part of this is that when any of these assumptions
2523 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2524 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2525 * since the per-packet code no longer checks the conditions. This is reflected
2526 * by the calls to these functions throughout the rest of the code, and must be
2527 * maintained if any of the TX path checks change.
2528 */
2529
2530void ieee80211_check_fast_xmit(struct sta_info *sta)
2531{
2532 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2533 struct ieee80211_local *local = sta->local;
2534 struct ieee80211_sub_if_data *sdata = sta->sdata;
2535 struct ieee80211_hdr *hdr = (void *)build.hdr;
2536 struct ieee80211_chanctx_conf *chanctx_conf;
2537 __le16 fc;
2538
30686bf7 2539 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
17c18bf8
JB		 2540 return;
2541
2542 /* Locking here protects both the pointer itself, and against concurrent
2543 * invocations winning data access races to, e.g., the key pointer that
2544 * is used.
2545 * Without it, the invocation of this function right after the key
2546 * pointer changes wouldn't be sufficient, as another CPU could access
2547 * the pointer, then stall, and then do the cache update after the CPU
2548 * that invalidated the key.
2549 * With the locking, such scenarios cannot happen as the check for the
2550 * key and the fast-tx assignment are done atomically, so the CPU that
2551 * modifies the key will either wait or other one will see the key
2552 * cleared/changed already.
2553 */
2554 spin_lock_bh(&sta->lock);
30686bf7
JB		 2555 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2556 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
17c18bf8
JB		 2557 sdata->vif.type == NL80211_IFTYPE_STATION)
2558 goto out;
2559
2560 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2561 goto out;
2562
2563 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2564 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
f7418bc1
FF		 2565 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2566 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
17c18bf8
JB		 2567 goto out;
2568
2569 if (sdata->noack_map)
2570 goto out;
2571
2572 /* fast-xmit doesn't handle fragmentation at all */
725b812c
JB		 2573 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2574 !local->ops->set_frag_threshold)
17c18bf8
JB		 2575 goto out;
2576
2577 rcu_read_lock();
2578 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2579 if (!chanctx_conf) {
2580 rcu_read_unlock();
2581 goto out;
2582 }
2583 build.band = chanctx_conf->def.chan->band;
2584 rcu_read_unlock();
2585
2586 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2587
2588 switch (sdata->vif.type) {
3ffd8840
JB		 2589 case NL80211_IFTYPE_ADHOC:
2590 /* DA SA BSSID */
2591 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2592 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2593 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2594 build.hdr_len = 24;
2595 break;
17c18bf8
JB		 2596 case NL80211_IFTYPE_STATION:
2597 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2598 /* DA SA BSSID */
2599 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2600 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2601 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2602 build.hdr_len = 24;
2603 break;
2604 }
2605
2606 if (sdata->u.mgd.use_4addr) {
2607 /* non-regular ethertype cannot use the fastpath */
2608 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2609 IEEE80211_FCTL_TODS);
2610 /* RA TA DA SA */
2611 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2612 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2613 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2614 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2615 build.hdr_len = 30;
2616 break;
2617 }
2618 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2619 /* BSSID SA DA */
2620 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2621 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2622 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2623 build.hdr_len = 24;
2624 break;
2625 case NL80211_IFTYPE_AP_VLAN:
2626 if (sdata->wdev.use_4addr) {
2627 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2628 IEEE80211_FCTL_TODS);
2629 /* RA TA DA SA */
2630 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2631 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2632 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2633 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2634 build.hdr_len = 30;
2635 break;
2636 }
2637 /* fall through */
2638 case NL80211_IFTYPE_AP:
2639 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2640 /* DA BSSID SA */
2641 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2642 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2643 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2644 build.hdr_len = 24;
2645 break;
2646 default:
2647 /* not handled on fast-xmit */
2648 goto out;
2649 }
2650
2651 if (sta->sta.wme) {
2652 build.hdr_len += 2;
2653 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2654 }
2655
2656 /* We store the key here so there's no point in using rcu_dereference()
2657 * but that's fine because the code that changes the pointers will call
2658 * this function after doing so. For a single CPU that would be enough,
2659 * for multiple see the comment above.
2660 */
2661 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2662 if (!build.key)
2663 build.key = rcu_access_pointer(sdata->default_unicast_key);
2664 if (build.key) {
e495c247 2665 bool gen_iv, iv_spc, mmic;
17c18bf8
JB		 2666
2667 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2668 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
e495c247 2669 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
17c18bf8
JB		 2670
2671 /* don't handle software crypto */
2672 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2673 goto out;
2674
2675 switch (build.key->conf.cipher) {
2676 case WLAN_CIPHER_SUITE_CCMP:
2677 case WLAN_CIPHER_SUITE_CCMP_256:
2678 /* add fixed key ID */
2679 if (gen_iv) {
2680 (build.hdr + build.hdr_len)[3] =
2681 0x20 | (build.key->conf.keyidx << 6);
2682 build.pn_offs = build.hdr_len;
2683 }
2684 if (gen_iv || iv_spc)
2685 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2686 break;
2687 case WLAN_CIPHER_SUITE_GCMP:
2688 case WLAN_CIPHER_SUITE_GCMP_256:
2689 /* add fixed key ID */
2690 if (gen_iv) {
2691 (build.hdr + build.hdr_len)[3] =
2692 0x20 | (build.key->conf.keyidx << 6);
2693 build.pn_offs = build.hdr_len;
2694 }
2695 if (gen_iv || iv_spc)
2696 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2697 break;
e495c247
JB		 2698 case WLAN_CIPHER_SUITE_TKIP:
2699 /* cannot handle MMIC or IV generation in xmit-fast */
2700 if (mmic || gen_iv)
2701 goto out;
2702 if (iv_spc)
2703 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2704 break;
2705 case WLAN_CIPHER_SUITE_WEP40:
2706 case WLAN_CIPHER_SUITE_WEP104:
2707 /* cannot handle IV generation in fast-xmit */
2708 if (gen_iv)
2709 goto out;
2710 if (iv_spc)
2711 build.hdr_len += IEEE80211_WEP_IV_LEN;
2712 break;
2713 case WLAN_CIPHER_SUITE_AES_CMAC:
2714 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2715 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2716 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2717 WARN(1,
2718 "management cipher suite 0x%x enabled for data\n",
2719 build.key->conf.cipher);
17c18bf8 2720 goto out;
e495c247
JB		 2721 default:
2722 /* we don't know how to generate IVs for this at all */
2723 if (WARN_ON(gen_iv))
2724 goto out;
2725 /* pure hardware keys are OK, of course */
2726 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2727 break;
2728 /* cipher scheme might require space allocation */
2729 if (iv_spc &&
2730 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2731 goto out;
2732 if (iv_spc)
2733 build.hdr_len += build.key->conf.iv_len;
17c18bf8
JB		 2734 }
2735
2736 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2737 }
2738
2739 hdr->frame_control = fc;
2740
2741 memcpy(build.hdr + build.hdr_len,
2742 rfc1042_header, sizeof(rfc1042_header));
2743 build.hdr_len += sizeof(rfc1042_header);
2744
2745 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2746 /* if the kmemdup fails, continue w/o fast_tx */
2747 if (!fast_tx)
2748 goto out;
2749
2750 out:
2751 /* we might have raced against another call to this function */
2752 old = rcu_dereference_protected(sta->fast_tx,
2753 lockdep_is_held(&sta->lock));
2754 rcu_assign_pointer(sta->fast_tx, fast_tx);
2755 if (old)
2756 kfree_rcu(old, rcu_head);
2757 spin_unlock_bh(&sta->lock);
2758}
2759
2760void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2761{
2762 struct sta_info *sta;
2763
2764 rcu_read_lock();
2765 list_for_each_entry_rcu(sta, &local->sta_list, list)
2766 ieee80211_check_fast_xmit(sta);
2767 rcu_read_unlock();
2768}
2769
2770void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2771{
2772 struct ieee80211_local *local = sdata->local;
2773 struct sta_info *sta;
2774
2775 rcu_read_lock();
2776
2777 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2778 if (sdata != sta->sdata &&
2779 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2780 continue;
2781 ieee80211_check_fast_xmit(sta);
2782 }
2783
2784 rcu_read_unlock();
2785}
2786
2787void ieee80211_clear_fast_xmit(struct sta_info *sta)
2788{
2789 struct ieee80211_fast_tx *fast_tx;
2790
2791 spin_lock_bh(&sta->lock);
2792 fast_tx = rcu_dereference_protected(sta->fast_tx,
2793 lockdep_is_held(&sta->lock));
2794 RCU_INIT_POINTER(sta->fast_tx, NULL);
2795 spin_unlock_bh(&sta->lock);
2796
2797 if (fast_tx)
2798 kfree_rcu(fast_tx, rcu_head);
2799}
2800
2801static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2802 struct net_device *dev, struct sta_info *sta,
2803 struct ieee80211_fast_tx *fast_tx,
2804 struct sk_buff *skb)
2805{
2806 struct ieee80211_local *local = sdata->local;
2807 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2808 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2809 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2810 struct ethhdr eth;
2811 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2812 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2813 struct ieee80211_tx_data tx;
2814 ieee80211_tx_result r;
2815 struct tid_ampdu_tx *tid_tx = NULL;
2816 u8 tid = IEEE80211_NUM_TIDS;
2817
2818 /* control port protocol needs a lot of special handling */
2819 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2820 return false;
2821
2822 /* only RFC 1042 SNAP */
2823 if (ethertype < ETH_P_802_3_MIN)
2824 return false;
2825
2826 /* don't handle TX status request here either */
2827 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2828 return false;
2829
2830 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2831 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2832 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
472be00d
JB		 2833 if (tid_tx) {
2834 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2835 return false;
2836 if (tid_tx->timeout)
2837 tid_tx->last_tx = jiffies;
2838 }
17c18bf8
JB		 2839 }
2840
2841 /* after this point (skb is modified) we cannot return false */
2842
2843 if (skb_shared(skb)) {
2844 struct sk_buff *tmp_skb = skb;
2845
2846 skb = skb_clone(skb, GFP_ATOMIC);
2847 kfree_skb(tmp_skb);
2848
2849 if (!skb)
2850 return true;
2851 }
2852
5a490510 2853 ieee80211_tx_stats(dev, skb->len + extra_head);
17c18bf8
JB		 2854
2855 /* will not be crypto-handled beyond what we do here, so use false
2856 * as the may-encrypt argument for the resize to not account for
2857 * more room than we already have in 'extra_head'
2858 */
2859 if (unlikely(ieee80211_skb_resize(sdata, skb,
2860 max_t(int, extra_head + hw_headroom -
2861 skb_headroom(skb), 0),
2862 false))) {
2863 kfree_skb(skb);
2864 return true;
2865 }
2866
2867 memcpy(&eth, skb->data, ETH_HLEN - 2);
2868 hdr = (void *)skb_push(skb, extra_head);
2869 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2870 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2871 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2872
2873 memset(info, 0, sizeof(*info));
2874 info->band = fast_tx->band;
2875 info->control.vif = &sdata->vif;
2876 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2877 IEEE80211_TX_CTL_DONTFRAG |
2878 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2879
2880 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2881 *ieee80211_get_qos_ctl(hdr) = tid;
50f36ae6
FF		 2882 if (!sta->sta.txq[0])
2883 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
17c18bf8
JB		 2884 } else {
2885 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2886 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2887 sdata->sequence_number += 0x10;
2888 }
2889
ccc6bb96 2890 if (skb_shinfo(skb)->gso_size)
e5a9f8d0 2891 sta->tx_stats.msdu[tid] +=
ccc6bb96
JB		 2892 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
2893 else
e5a9f8d0 2894 sta->tx_stats.msdu[tid]++;
17c18bf8
JB		 2895
2896 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2897
2898 __skb_queue_head_init(&tx.skbs);
2899
2900 tx.flags = IEEE80211_TX_UNICAST;
2901 tx.local = local;
2902 tx.sdata = sdata;
2903 tx.sta = sta;
2904 tx.key = fast_tx->key;
2905
2906 if (fast_tx->key)
2907 info->control.hw_key = &fast_tx->key->conf;
2908
30686bf7 2909 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
17c18bf8
JB		 2910 tx.skb = skb;
2911 r = ieee80211_tx_h_rate_ctrl(&tx);
2912 skb = tx.skb;
2913 tx.skb = NULL;
2914
2915 if (r != TX_CONTINUE) {
2916 if (r != TX_QUEUED)
2917 kfree_skb(skb);
2918 return true;
2919 }
2920 }
2921
2922 /* statistics normally done by ieee80211_tx_h_stats (but that
2923 * has to consider fragmentation, so is more complex)
2924 */
e5a9f8d0
JB		 2925 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
2926 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
17c18bf8
JB		 2927
2928 if (fast_tx->pn_offs) {
2929 u64 pn;
2930 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2931
2932 switch (fast_tx->key->conf.cipher) {
2933 case WLAN_CIPHER_SUITE_CCMP:
2934 case WLAN_CIPHER_SUITE_CCMP_256:
17c18bf8
JB		 2935 case WLAN_CIPHER_SUITE_GCMP:
2936 case WLAN_CIPHER_SUITE_GCMP_256:
db388a56 2937 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
17c18bf8
JB		 2938 crypto_hdr[0] = pn;
2939 crypto_hdr[1] = pn >> 8;
2940 crypto_hdr[4] = pn >> 16;
2941 crypto_hdr[5] = pn >> 24;
2942 crypto_hdr[6] = pn >> 32;
2943 crypto_hdr[7] = pn >> 40;
2944 break;
2945 }
2946 }
2947
2948 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2949 sdata = container_of(sdata->bss,
2950 struct ieee80211_sub_if_data, u.ap);
2951
2952 __skb_queue_tail(&tx.skbs, skb);
2953 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2954 return true;
2955}
2956
4c9451ed
JB		 2957void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2958 struct net_device *dev,
2959 u32 info_flags)
2960{
2961 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
97ffe757 2962 struct sta_info *sta;
80616c0d 2963 struct sk_buff *next;
4c9451ed
JB		 2964
2965 if (unlikely(skb->len < ETH_HLEN)) {
2966 kfree_skb(skb);
2967 return;
2968 }
2969
2970 rcu_read_lock();
e2ebc74d 2971
2d981fdd
JB		 2972 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2973 goto out_free;
4c9451ed 2974
17c18bf8
JB		 2975 if (!IS_ERR_OR_NULL(sta)) {
2976 struct ieee80211_fast_tx *fast_tx;
2977
2978 fast_tx = rcu_dereference(sta->fast_tx);
2979
2980 if (fast_tx &&
2981 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2982 goto out;
2983 }
2984
80616c0d
JB		 2985 if (skb_is_gso(skb)) {
2986 struct sk_buff *segs;
680a0dab 2987
80616c0d
JB		 2988 segs = skb_gso_segment(skb, 0);
2989 if (IS_ERR(segs)) {
2d981fdd 2990 goto out_free;
80616c0d
JB		 2991 } else if (segs) {
2992 consume_skb(skb);
2993 skb = segs;
2994 }
2995 } else {
2996 /* we cannot process non-linear frames on this path */
2997 if (skb_linearize(skb)) {
2998 kfree_skb(skb);
2999 goto out;
3000 }
3001
3002 /* the frame could be fragmented, software-encrypted, and other
3003 * things so we cannot really handle checksum offload with it -
3004 * fix it up in software before we handle anything else.
3005 */
3006 if (skb->ip_summed == CHECKSUM_PARTIAL) {
f603f1f3
JB		 3007 skb_set_transport_header(skb,
3008 skb_checksum_start_offset(skb));
80616c0d
JB		 3009 if (skb_checksum_help(skb))
3010 goto out_free;
3011 }
2d981fdd
JB		 3012 }
3013
80616c0d
JB		 3014 next = skb;
3015 while (next) {
3016 skb = next;
3017 next = skb->next;
4c9451ed 3018
80616c0d
JB		 3019 skb->prev = NULL;
3020 skb->next = NULL;
3021
3022 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3023 if (IS_ERR(skb))
3024 goto out;
e2ebc74d 3025
5a490510 3026 ieee80211_tx_stats(dev, skb->len);
80616c0d
JB		 3027
3028 ieee80211_xmit(sdata, sta, skb);
3029 }
2d981fdd
JB		 3030 goto out;
3031 out_free:
3032 kfree_skb(skb);
4c9451ed 3033 out:
55de908a 3034 rcu_read_unlock();
e2ebc74d
JB		 3035}
3036
4c9451ed
JB		 3037/**
3038 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3039 * @skb: packet to be sent
3040 * @dev: incoming interface
3041 *
3042 * On failure skb will be freed.
3043 */
24d342c5
LK		 3044netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3045 struct net_device *dev)
3046{
3047 __ieee80211_subif_start_xmit(skb, dev, 0);
3048 return NETDEV_TX_OK;
3049}
e2ebc74d 3050
7528ec57
JB		 3051struct sk_buff *
3052ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3053 struct sk_buff *skb, u32 info_flags)
3054{
3055 struct ieee80211_hdr *hdr;
3056 struct ieee80211_tx_data tx = {
3057 .local = sdata->local,
3058 .sdata = sdata,
3059 };
97ffe757 3060 struct sta_info *sta;
7528ec57
JB		 3061
3062 rcu_read_lock();
3063
97ffe757
JB		 3064 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3065 kfree_skb(skb);
3066 skb = ERR_PTR(-EINVAL);
3067 goto out;
3068 }
3069
3070 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
7528ec57
JB		 3071 if (IS_ERR(skb))
3072 goto out;
3073
3074 hdr = (void *)skb->data;
3075 tx.sta = sta_info_get(sdata, hdr->addr1);
3076 tx.skb = skb;
3077
3078 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3079 rcu_read_unlock();
3080 kfree_skb(skb);
3081 return ERR_PTR(-EINVAL);
3082 }
3083
3084out:
3085 rcu_read_unlock();
3086 return skb;
3087}
3088
e2530083
JB		 3089/*
3090 * ieee80211_clear_tx_pending may not be called in a context where
3091 * it is possible that it packets could come in again.
3092 */
e2ebc74d
JB		 3093void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3094{
1f98ab7f 3095 struct sk_buff *skb;
2de8e0d9 3096 int i;
e2ebc74d 3097
1f98ab7f
FF		 3098 for (i = 0; i < local->hw.queues; i++) {
3099 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3100 ieee80211_free_txskb(&local->hw, skb);
3101 }
e2ebc74d
JB		 3102}
3103
7bb45683
JB		 3104/*
3105 * Returns false if the frame couldn't be transmitted but was queued instead,
3106 * which in this case means re-queued -- take as an indication to stop sending
3107 * more pending frames.
3108 */
cd8ffc80
JB		 3109static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3110 struct sk_buff *skb)
3111{
3112 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3113 struct ieee80211_sub_if_data *sdata;
3114 struct sta_info *sta;
3115 struct ieee80211_hdr *hdr;
7bb45683 3116 bool result;
55de908a 3117 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 3118
5061b0c2 3119 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 3120
3121 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 3122 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3123 if (unlikely(!chanctx_conf)) {
3124 dev_kfree_skb(skb);
3125 return true;
3126 }
73c4e195 3127 info->band = chanctx_conf->def.chan->band;
7c10770f 3128 result = ieee80211_tx(sdata, NULL, skb, true);
cd8ffc80 3129 } else {
252b86c4
JB		 3130 struct sk_buff_head skbs;
3131
3132 __skb_queue_head_init(&skbs);
3133 __skb_queue_tail(&skbs, skb);
3134
cd8ffc80 3135 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 3136 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 3137
74e4dbfd 3138 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 3139 }
3140
cd8ffc80
JB		 3141 return result;
3142}
3143
e2530083 3144/*
3b8d81e0 3145 * Transmit all pending packets. Called from tasklet.
e2530083 3146 */
e2ebc74d
JB		 3147void ieee80211_tx_pending(unsigned long data)
3148{
3149 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 3150 unsigned long flags;
cd8ffc80 3151 int i;
3b8d81e0 3152 bool txok;
e2ebc74d 3153
f0e72851 3154 rcu_read_lock();
e2530083 3155
3b8d81e0 3156 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 3157 for (i = 0; i < local->hw.queues; i++) {
3158 /*
3159 * If queue is stopped by something other than due to pending
3160 * frames, or we have no pending frames, proceed to next queue.
3161 */
3b8d81e0 3162 if (local->queue_stop_reasons[i] ||
2a577d98 3163 skb_queue_empty(&local->pending[i]))
e2ebc74d 3164 continue;
e2530083 3165
2a577d98 3166 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 3167 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 3168 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 3169
a7bc376c 3170 if (WARN_ON(!info->control.vif)) {
c3e7724b 3171 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 3172 continue;
3173 }
3174
3b8d81e0
JB		 3175 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3176 flags);
3177
3178 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 3179 spin_lock_irqsave(&local->queue_stop_reason_lock,
3180 flags);
3181 if (!txok)
2a577d98 3182 break;
e2ebc74d 3183 }
7236fe29
JB		 3184
3185 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 3186 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 3187 }
3b8d81e0 3188 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 3189
f0e72851 3190 rcu_read_unlock();
e2ebc74d
JB		 3191}
3192
3193/* functions for drivers to get certain frames */
3194
eac70c13 3195static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3196 struct ps_data *ps, struct sk_buff *skb,
3197 bool is_template)
e2ebc74d
JB		 3198{
3199 u8 *pos, *tim;
3200 int aid0 = 0;
3201 int i, have_bits = 0, n1, n2;
3202
3203 /* Generate bitmap for TIM only if there are any STAs in power save
3204 * mode. */
d012a605 3205 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 3206 /* in the hope that this is faster than
3207 * checking byte-for-byte */
f359d3fe 3208 have_bits = !bitmap_empty((unsigned long *)ps->tim,
e2ebc74d 3209 IEEE80211_MAX_AID+1);
6ec8c332
AO		 3210 if (!is_template) {
3211 if (ps->dtim_count == 0)
3212 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3213 else
3214 ps->dtim_count--;
3215 }
e2ebc74d
JB		 3216
3217 tim = pos = (u8 *) skb_put(skb, 6);
3218 *pos++ = WLAN_EID_TIM;
3219 *pos++ = 4;
d012a605 3220 *pos++ = ps->dtim_count;
8860020e 3221 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 3222
d012a605 3223 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 3224 aid0 = 1;
3225
d012a605 3226 ps->dtim_bc_mc = aid0 == 1;
512119b3 3227
e2ebc74d
JB		 3228 if (have_bits) {
3229 /* Find largest even number N1 so that bits numbered 1 through
3230 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3231 * (N2 + 1) x 8 through 2007 are 0. */
3232 n1 = 0;
3233 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 3234 if (ps->tim[i]) {
e2ebc74d
JB		 3235 n1 = i & 0xfe;
3236 break;
3237 }
3238 }
3239 n2 = n1;
3240 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 3241 if (ps->tim[i]) {
e2ebc74d
JB		 3242 n2 = i;
3243 break;
3244 }
3245 }
3246
3247 /* Bitmap control */
3248 *pos++ = n1 | aid0;
3249 /* Part Virt Bitmap */
5220da39 3250 skb_put(skb, n2 - n1);
d012a605 3251 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 3252
3253 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 3254 } else {
3255 *pos++ = aid0; /* Bitmap control */
3256 *pos++ = 0; /* Part Virt Bitmap */
3257 }
e2ebc74d
JB		 3258}
3259
eac70c13 3260static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
6ec8c332
AO		 3261 struct ps_data *ps, struct sk_buff *skb,
3262 bool is_template)
eac70c13
MP		 3263{
3264 struct ieee80211_local *local = sdata->local;
3265
3266 /*
3267 * Not very nice, but we want to allow the driver to call
3268 * ieee80211_beacon_get() as a response to the set_tim()
3269 * callback. That, however, is already invoked under the
3270 * sta_lock to guarantee consistent and race-free update
3271 * of the tim bitmap in mac80211 and the driver.
3272 */
3273 if (local->tim_in_locked_section) {
6ec8c332 3274 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
eac70c13 3275 } else {
1b91731d 3276 spin_lock_bh(&local->tim_lock);
6ec8c332 3277 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
1b91731d 3278 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 3279 }
3280
3281 return 0;
3282}
3283
1af586c9
AO		 3284static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3285 struct beacon_data *beacon)
73da7d5b
SW		 3286{
3287 struct probe_resp *resp;
cd7760e6
SW		 3288 u8 *beacon_data;
3289 size_t beacon_data_len;
0d06d9ba 3290 int i;
af296bdb 3291 u8 count = beacon->csa_current_counter;
cd7760e6
SW		 3292
3293 switch (sdata->vif.type) {
3294 case NL80211_IFTYPE_AP:
3295 beacon_data = beacon->tail;
3296 beacon_data_len = beacon->tail_len;
3297 break;
3298 case NL80211_IFTYPE_ADHOC:
3299 beacon_data = beacon->head;
3300 beacon_data_len = beacon->head_len;
3301 break;
b8456a14
CYY		 3302 case NL80211_IFTYPE_MESH_POINT:
3303 beacon_data = beacon->head;
3304 beacon_data_len = beacon->head_len;
3305 break;
cd7760e6
SW		 3306 default:
3307 return;
3308 }
73da7d5b 3309
af296bdb 3310 rcu_read_lock();
0d06d9ba 3311 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
af296bdb 3312 resp = rcu_dereference(sdata->u.ap.probe_resp);
0d06d9ba 3313
af296bdb
MK		 3314 if (beacon->csa_counter_offsets[i]) {
3315 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3316 beacon_data_len)) {
0d06d9ba
AO		 3317 rcu_read_unlock();
3318 return;
3319 }
af296bdb
MK		 3320
3321 beacon_data[beacon->csa_counter_offsets[i]] = count;
73da7d5b 3322 }
af296bdb
MK		 3323
3324 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3325 resp->data[resp->csa_counter_offsets[i]] = count;
73da7d5b 3326 }
af296bdb 3327 rcu_read_unlock();
1af586c9
AO		 3328}
3329
e996ec2a
WD		 3330static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3331{
3332 beacon->csa_current_counter--;
3333
3334 /* the counter should never reach 0 */
3335 WARN_ON_ONCE(!beacon->csa_current_counter);
3336
3337 return beacon->csa_current_counter;
3338}
3339
1af586c9
AO		 3340u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3341{
3342 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
af296bdb
MK		 3343 struct beacon_data *beacon = NULL;
3344 u8 count = 0;
0d06d9ba 3345
af296bdb
MK		 3346 rcu_read_lock();
3347
3348 if (sdata->vif.type == NL80211_IFTYPE_AP)
3349 beacon = rcu_dereference(sdata->u.ap.beacon);
3350 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3351 beacon = rcu_dereference(sdata->u.ibss.presp);
3352 else if (ieee80211_vif_is_mesh(&sdata->vif))
3353 beacon = rcu_dereference(sdata->u.mesh.beacon);
3354
3355 if (!beacon)
3356 goto unlock;
3357
e996ec2a 3358 count = __ieee80211_csa_update_counter(beacon);
1af586c9 3359
af296bdb
MK		 3360unlock:
3361 rcu_read_unlock();
3362 return count;
73da7d5b 3363}
1af586c9 3364EXPORT_SYMBOL(ieee80211_csa_update_counter);
73da7d5b
SW		 3365
3366bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3367{
3368 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3369 struct beacon_data *beacon = NULL;
3370 u8 *beacon_data;
3371 size_t beacon_data_len;
73da7d5b
SW		 3372 int ret = false;
3373
3374 if (!ieee80211_sdata_running(sdata))
3375 return false;
3376
3377 rcu_read_lock();
3378 if (vif->type == NL80211_IFTYPE_AP) {
3379 struct ieee80211_if_ap *ap = &sdata->u.ap;
3380
3381 beacon = rcu_dereference(ap->beacon);
3382 if (WARN_ON(!beacon || !beacon->tail))
3383 goto out;
3384 beacon_data = beacon->tail;
3385 beacon_data_len = beacon->tail_len;
cd7760e6
SW		 3386 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3387 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3388
3389 beacon = rcu_dereference(ifibss->presp);
3390 if (!beacon)
3391 goto out;
3392
b8456a14
CYY		 3393 beacon_data = beacon->head;
3394 beacon_data_len = beacon->head_len;
3395 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3396 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3397
3398 beacon = rcu_dereference(ifmsh->beacon);
3399 if (!beacon)
3400 goto out;
3401
cd7760e6
SW		 3402 beacon_data = beacon->head;
3403 beacon_data_len = beacon->head_len;
73da7d5b
SW		 3404 } else {
3405 WARN_ON(1);
3406 goto out;
3407 }
3408
10d78f27
MK		 3409 if (!beacon->csa_counter_offsets[0])
3410 goto out;
3411
af296bdb 3412 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
73da7d5b
SW		 3413 goto out;
3414
af296bdb 3415 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
73da7d5b
SW		 3416 ret = true;
3417 out:
3418 rcu_read_unlock();
3419
3420 return ret;
3421}
3422EXPORT_SYMBOL(ieee80211_csa_is_complete);
3423
6ec8c332
AO		 3424static struct sk_buff *
3425__ieee80211_beacon_get(struct ieee80211_hw *hw,
3426 struct ieee80211_vif *vif,
3427 struct ieee80211_mutable_offsets *offs,
3428 bool is_template)
e2ebc74d
JB		 3429{
3430 struct ieee80211_local *local = hw_to_local(hw);
af296bdb 3431 struct beacon_data *beacon = NULL;
9d139c81 3432 struct sk_buff *skb = NULL;
e039fa4a 3433 struct ieee80211_tx_info *info;
e2ebc74d 3434 struct ieee80211_sub_if_data *sdata = NULL;
55de908a 3435 enum ieee80211_band band;
e00cfce0 3436 struct ieee80211_tx_rate_control txrc;
55de908a 3437 struct ieee80211_chanctx_conf *chanctx_conf;
1af586c9 3438 int csa_off_base = 0;
8318d78a 3439
5dfdaf58 3440 rcu_read_lock();
e2ebc74d 3441
32bfd35d 3442 sdata = vif_to_sdata(vif);
55de908a 3443 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 3444
55de908a 3445 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 3446 goto out;
3447
6ec8c332
AO		 3448 if (offs)
3449 memset(offs, 0, sizeof(*offs));
eddcbb94 3450
05c914fe 3451 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605 3452 struct ieee80211_if_ap *ap = &sdata->u.ap;
d012a605 3453
af296bdb 3454 beacon = rcu_dereference(ap->beacon);
3ad97fbc 3455 if (beacon) {
10d78f27 3456 if (beacon->csa_counter_offsets[0]) {
1af586c9 3457 if (!is_template)
e996ec2a 3458 __ieee80211_csa_update_counter(beacon);
1af586c9
AO		 3459
3460 ieee80211_set_csa(sdata, beacon);
3461 }
73da7d5b 3462
902acc78
JB		 3463 /*
3464 * headroom, head length,
3465 * tail length and maximum TIM length
3466 */
3467 skb = dev_alloc_skb(local->tx_headroom +
3468 beacon->head_len +
70dabeb7
FF		 3469 beacon->tail_len + 256 +
3470 local->hw.extra_beacon_tailroom);
902acc78
JB		 3471 if (!skb)
3472 goto out;
33b64eb2 3473
902acc78
JB		 3474 skb_reserve(skb, local->tx_headroom);
3475 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3476 beacon->head_len);
33b64eb2 3477
6ec8c332
AO		 3478 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3479 is_template);
33b64eb2 3480
6ec8c332
AO		 3481 if (offs) {
3482 offs->tim_offset = beacon->head_len;
3483 offs->tim_length = skb->len - beacon->head_len;
1af586c9
AO		 3484
3485 /* for AP the csa offsets are from tail */
3486 csa_off_base = skb->len;
6ec8c332 3487 }
eddcbb94 3488
902acc78
JB		 3489 if (beacon->tail)
3490 memcpy(skb_put(skb, beacon->tail_len),
3491 beacon->tail, beacon->tail_len);
9d139c81
JB		 3492 } else
3493 goto out;
05c914fe 3494 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 3495 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 3496 struct ieee80211_hdr *hdr;
33b64eb2 3497
af296bdb
MK		 3498 beacon = rcu_dereference(ifibss->presp);
3499 if (!beacon)
9d139c81
JB		 3500 goto out;
3501
10d78f27 3502 if (beacon->csa_counter_offsets[0]) {
1af586c9 3503 if (!is_template)
e996ec2a 3504 __ieee80211_csa_update_counter(beacon);
cd7760e6 3505
af296bdb 3506 ieee80211_set_csa(sdata, beacon);
1af586c9 3507 }
cd7760e6 3508
af296bdb 3509 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
70dabeb7 3510 local->hw.extra_beacon_tailroom);
9d139c81
JB		 3511 if (!skb)
3512 goto out;
c3ffeab4 3513 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3514 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3515 beacon->head_len);
9d139c81
JB		 3516
3517 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 3518 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3519 IEEE80211_STYPE_BEACON);
902acc78 3520 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 3521 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
472dbc45 3522
af296bdb
MK		 3523 beacon = rcu_dereference(ifmsh->beacon);
3524 if (!beacon)
ac1bd846 3525 goto out;
ac1bd846 3526
10d78f27 3527 if (beacon->csa_counter_offsets[0]) {
1af586c9
AO		 3528 if (!is_template)
3529 /* TODO: For mesh csa_counter is in TU, so
3530 * decrementing it by one isn't correct, but
3531 * for now we leave it consistent with overall
3532 * mac80211's behavior.
3533 */
e996ec2a 3534 __ieee80211_csa_update_counter(beacon);
1af586c9 3535
af296bdb 3536 ieee80211_set_csa(sdata, beacon);
1af586c9 3537 }
b8456a14 3538
dbf498fb 3539 if (ifmsh->sync_ops)
af296bdb 3540 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
dbf498fb 3541
3b69a9c5 3542 skb = dev_alloc_skb(local->tx_headroom +
af296bdb 3543 beacon->head_len +
3f52b7e3 3544 256 + /* TIM IE */
af296bdb 3545 beacon->tail_len +
70dabeb7 3546 local->hw.extra_beacon_tailroom);
902acc78
JB		 3547 if (!skb)
3548 goto out;
2b5e1967 3549 skb_reserve(skb, local->tx_headroom);
af296bdb
MK		 3550 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3551 beacon->head_len);
6ec8c332
AO		 3552 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3553
3554 if (offs) {
af296bdb
MK		 3555 offs->tim_offset = beacon->head_len;
3556 offs->tim_length = skb->len - beacon->head_len;
6ec8c332
AO		 3557 }
3558
af296bdb
MK		 3559 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3560 beacon->tail_len);
9d139c81
JB		 3561 } else {
3562 WARN_ON(1);
5dfdaf58 3563 goto out;
e2ebc74d
JB		 3564 }
3565
1af586c9 3566 /* CSA offsets */
af296bdb 3567 if (offs && beacon) {
1af586c9
AO		 3568 int i;
3569
3570 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
af296bdb 3571 u16 csa_off = beacon->csa_counter_offsets[i];
1af586c9
AO		 3572
3573 if (!csa_off)
3574 continue;
3575
3576 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3577 }
3578 }
3579
4bf88530 3580 band = chanctx_conf->def.chan->band;
55de908a 3581
e039fa4a
JB		 3582 info = IEEE80211_SKB_CB(skb);
3583
3b8d81e0 3584 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 3585 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 3586 info->band = band;
e00cfce0
JM		 3587
3588 memset(&txrc, 0, sizeof(txrc));
3589 txrc.hw = hw;
e31583cd 3590 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 3591 txrc.bss_conf = &sdata->vif.bss_conf;
3592 txrc.skb = skb;
3593 txrc.reported_rate.idx = -1;
37eb0b16 3594 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 3595 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 3596 txrc.max_rate_idx = -1;
3597 else
3598 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 3599 txrc.bss = true;
e00cfce0 3600 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 3601
3602 info->control.vif = vif;
f591fa5d 3603
a472e71b
JL		 3604 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3605 IEEE80211_TX_CTL_ASSIGN_SEQ |
3606 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 3607 out:
5dfdaf58 3608 rcu_read_unlock();
e2ebc74d 3609 return skb;
6ec8c332
AO		 3610
3611}
3612
3613struct sk_buff *
3614ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3615 struct ieee80211_vif *vif,
3616 struct ieee80211_mutable_offsets *offs)
3617{
3618 return __ieee80211_beacon_get(hw, vif, offs, true);
3619}
3620EXPORT_SYMBOL(ieee80211_beacon_get_template);
3621
3622struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3623 struct ieee80211_vif *vif,
3624 u16 *tim_offset, u16 *tim_length)
3625{
3626 struct ieee80211_mutable_offsets offs = {};
3627 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
35afa588
HS		 3628 struct sk_buff *copy;
3629 struct ieee80211_supported_band *sband;
3630 int shift;
3631
3632 if (!bcn)
3633 return bcn;
6ec8c332
AO		 3634
3635 if (tim_offset)
3636 *tim_offset = offs.tim_offset;
3637
3638 if (tim_length)
3639 *tim_length = offs.tim_length;
3640
35afa588
HS		 3641 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
3642 !hw_to_local(hw)->monitors)
3643 return bcn;
3644
3645 /* send a copy to monitor interfaces */
3646 copy = skb_copy(bcn, GFP_ATOMIC);
3647 if (!copy)
3648 return bcn;
3649
3650 shift = ieee80211_vif_get_shift(vif);
3651 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
3652 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
3653
6ec8c332 3654 return bcn;
e2ebc74d 3655}
eddcbb94 3656EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 3657
02945821
AN		 3658struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3659 struct ieee80211_vif *vif)
3660{
3661 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 3662 struct sk_buff *skb = NULL;
3663 struct probe_resp *presp = NULL;
02945821
AN		 3664 struct ieee80211_hdr *hdr;
3665 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3666
3667 if (sdata->vif.type != NL80211_IFTYPE_AP)
3668 return NULL;
3669
3670 rcu_read_lock();
3671
3672 ap = &sdata->u.ap;
3673 presp = rcu_dereference(ap->probe_resp);
3674 if (!presp)
3675 goto out;
3676
aa7a0080 3677 skb = dev_alloc_skb(presp->len);
02945821
AN		 3678 if (!skb)
3679 goto out;
3680
aa7a0080
ES		 3681 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3682
02945821
AN		 3683 hdr = (struct ieee80211_hdr *) skb->data;
3684 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3685
3686out:
3687 rcu_read_unlock();
3688 return skb;
3689}
3690EXPORT_SYMBOL(ieee80211_proberesp_get);
3691
7044cc56
KV		 3692struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3693 struct ieee80211_vif *vif)
3694{
3695 struct ieee80211_sub_if_data *sdata;
3696 struct ieee80211_if_managed *ifmgd;
3697 struct ieee80211_pspoll *pspoll;
3698 struct ieee80211_local *local;
3699 struct sk_buff *skb;
3700
3701 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3702 return NULL;
3703
3704 sdata = vif_to_sdata(vif);
3705 ifmgd = &sdata->u.mgd;
3706 local = sdata->local;
3707
3708 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 3709 if (!skb)
7044cc56 3710 return NULL;
d15b8459 3711
7044cc56
KV		 3712 skb_reserve(skb, local->hw.extra_tx_headroom);
3713
3714 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3715 memset(pspoll, 0, sizeof(*pspoll));
3716 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3717 IEEE80211_STYPE_PSPOLL);
3718 pspoll->aid = cpu_to_le16(ifmgd->aid);
3719
3720 /* aid in PS-Poll has its two MSBs each set to 1 */
3721 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3722
3723 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3724 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3725
3726 return skb;
3727}
3728EXPORT_SYMBOL(ieee80211_pspoll_get);
3729
3730struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3731 struct ieee80211_vif *vif)
3732{
3733 struct ieee80211_hdr_3addr *nullfunc;
3734 struct ieee80211_sub_if_data *sdata;
3735 struct ieee80211_if_managed *ifmgd;
3736 struct ieee80211_local *local;
3737 struct sk_buff *skb;
3738
3739 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3740 return NULL;
3741
3742 sdata = vif_to_sdata(vif);
3743 ifmgd = &sdata->u.mgd;
3744 local = sdata->local;
3745
3746 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 3747 if (!skb)
7044cc56 3748 return NULL;
d15b8459 3749
7044cc56
KV		 3750 skb_reserve(skb, local->hw.extra_tx_headroom);
3751
3752 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3753 sizeof(*nullfunc));
3754 memset(nullfunc, 0, sizeof(*nullfunc));
3755 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3756 IEEE80211_STYPE_NULLFUNC |
3757 IEEE80211_FCTL_TODS);
3758 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3759 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3760 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3761
3762 return skb;
3763}
3764EXPORT_SYMBOL(ieee80211_nullfunc_get);
3765
05e54ea6 3766struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
a344d677 3767 const u8 *src_addr,
05e54ea6 3768 const u8 *ssid, size_t ssid_len,
b9a9ada1 3769 size_t tailroom)
05e54ea6 3770{
a344d677 3771 struct ieee80211_local *local = hw_to_local(hw);
05e54ea6
KV		 3772 struct ieee80211_hdr_3addr *hdr;
3773 struct sk_buff *skb;
3774 size_t ie_ssid_len;
3775 u8 *pos;
3776
05e54ea6
KV		 3777 ie_ssid_len = 2 + ssid_len;
3778
3779 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 3780 ie_ssid_len + tailroom);
d15b8459 3781 if (!skb)
05e54ea6 3782 return NULL;
05e54ea6
KV		 3783
3784 skb_reserve(skb, local->hw.extra_tx_headroom);
3785
3786 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3787 memset(hdr, 0, sizeof(*hdr));
3788 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3789 IEEE80211_STYPE_PROBE_REQ);
e83e6541 3790 eth_broadcast_addr(hdr->addr1);
a344d677 3791 memcpy(hdr->addr2, src_addr, ETH_ALEN);
e83e6541 3792 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 3793
3794 pos = skb_put(skb, ie_ssid_len);
3795 *pos++ = WLAN_EID_SSID;
3796 *pos++ = ssid_len;
88c868c4 3797 if (ssid_len)
05e54ea6
KV		 3798 memcpy(pos, ssid, ssid_len);
3799 pos += ssid_len;
3800
05e54ea6
KV		 3801 return skb;
3802}
3803EXPORT_SYMBOL(ieee80211_probereq_get);
3804
32bfd35d 3805void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3806 const void *frame, size_t frame_len,
e039fa4a 3807 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3808 struct ieee80211_rts *rts)
3809{
3810 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3811
065e9605
HH		 3812 rts->frame_control =
3813 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 3814 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3815 frame_txctl);
e2ebc74d
JB		 3816 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3817 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3818}
3819EXPORT_SYMBOL(ieee80211_rts_get);
3820
32bfd35d 3821void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 3822 const void *frame, size_t frame_len,
e039fa4a 3823 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 3824 struct ieee80211_cts *cts)
3825{
3826 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 3827
065e9605
HH		 3828 cts->frame_control =
3829 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 3830 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3831 frame_len, frame_txctl);
e2ebc74d
JB		 3832 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3833}
3834EXPORT_SYMBOL(ieee80211_ctstoself_get);
3835
3836struct sk_buff *
32bfd35d 3837ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 3838 struct ieee80211_vif *vif)
e2ebc74d
JB		 3839{
3840 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 3841 struct sk_buff *skb = NULL;
5cf121c3 3842 struct ieee80211_tx_data tx;
e2ebc74d 3843 struct ieee80211_sub_if_data *sdata;
d012a605 3844 struct ps_data *ps;
e039fa4a 3845 struct ieee80211_tx_info *info;
55de908a 3846 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 3847
32bfd35d 3848 sdata = vif_to_sdata(vif);
5dfdaf58 3849
5dfdaf58 3850 rcu_read_lock();
55de908a 3851 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 3852
d012a605
MP		 3853 if (!chanctx_conf)
3854 goto out;
3855
3856 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3857 struct beacon_data *beacon =
3858 rcu_dereference(sdata->u.ap.beacon);
3859
3860 if (!beacon || !beacon->head)
3861 goto out;
3862
3863 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 3864 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3865 ps = &sdata->u.mesh.ps;
d012a605 3866 } else {
747cf5e9 3867 goto out;
d012a605 3868 }
5dfdaf58 3869
d012a605 3870 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 3871 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 3872
e2ebc74d 3873 while (1) {
d012a605 3874 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 3875 if (!skb)
747cf5e9 3876 goto out;
e2ebc74d
JB		 3877 local->total_ps_buffered--;
3878
d012a605 3879 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 3880 struct ieee80211_hdr *hdr =
3881 (struct ieee80211_hdr *) skb->data;
3882 /* more buffered multicast/broadcast frames ==> set
3883 * MoreData flag in IEEE 802.11 header to inform PS
3884 * STAs */
3885 hdr->frame_control |=
3886 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3887 }
3888
112c44b2 3889 if (sdata->vif.type == NL80211_IFTYPE_AP)
7cbf9d01 3890 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
7c10770f 3891 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
e2ebc74d
JB		 3892 break;
3893 dev_kfree_skb_any(skb);
3894 }
e039fa4a
JB		 3895
3896 info = IEEE80211_SKB_CB(skb);
3897
5cf121c3 3898 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 3899 info->band = chanctx_conf->def.chan->band;
e2ebc74d 3900
97b045d6 3901 if (invoke_tx_handlers(&tx))
e2ebc74d 3902 skb = NULL;
97b045d6 3903 out:
d0709a65 3904 rcu_read_unlock();
e2ebc74d
JB		 3905
3906 return skb;
3907}
3908EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 3909
b6da911b
LK		 3910int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3911{
3912 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3913 struct ieee80211_sub_if_data *sdata = sta->sdata;
3914 struct ieee80211_local *local = sdata->local;
3915 int ret;
3916 u32 queues;
3917
3918 lockdep_assert_held(&local->sta_mtx);
3919
3920 /* only some cases are supported right now */
3921 switch (sdata->vif.type) {
3922 case NL80211_IFTYPE_STATION:
3923 case NL80211_IFTYPE_AP:
3924 case NL80211_IFTYPE_AP_VLAN:
3925 break;
3926 default:
3927 WARN_ON(1);
3928 return -EINVAL;
3929 }
3930
3931 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3932 return -EINVAL;
3933
3934 if (sta->reserved_tid == tid) {
3935 ret = 0;
3936 goto out;
3937 }
3938
3939 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3940 sdata_err(sdata, "TID reservation already active\n");
3941 ret = -EALREADY;
3942 goto out;
3943 }
3944
3945 ieee80211_stop_vif_queues(sdata->local, sdata,
3946 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3947
3948 synchronize_net();
3949
3950 /* Tear down BA sessions so we stop aggregating on this TID */
30686bf7 3951 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
b6da911b
LK		 3952 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3953 __ieee80211_stop_tx_ba_session(sta, tid,
3954 AGG_STOP_LOCAL_REQUEST);
3955 }
3956
3957 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3b24f4c6 3958 __ieee80211_flush_queues(local, sdata, queues, false);
b6da911b
LK		 3959
3960 sta->reserved_tid = tid;
3961
3962 ieee80211_wake_vif_queues(local, sdata,
3963 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3964
30686bf7 3965 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
b6da911b
LK		 3966 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3967
3968 ret = 0;
3969 out:
3970 return ret;
3971}
3972EXPORT_SYMBOL(ieee80211_reserve_tid);
3973
3974void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3975{
3976 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3977 struct ieee80211_sub_if_data *sdata = sta->sdata;
3978
3979 lockdep_assert_held(&sdata->local->sta_mtx);
3980
3981 /* only some cases are supported right now */
3982 switch (sdata->vif.type) {
3983 case NL80211_IFTYPE_STATION:
3984 case NL80211_IFTYPE_AP:
3985 case NL80211_IFTYPE_AP_VLAN:
3986 break;
3987 default:
3988 WARN_ON(1);
3989 return;
3990 }
3991
3992 if (tid != sta->reserved_tid) {
3993 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3994 return;
3995 }
3996
3997 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3998}
3999EXPORT_SYMBOL(ieee80211_unreserve_tid);
4000
55de908a
JB		 4001void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4002 struct sk_buff *skb, int tid,
4003 enum ieee80211_band band)
3b8d81e0 4004{
353d09c6 4005 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 4006
d57a544d
ZS		 4007 skb_reset_mac_header(skb);
4008 skb_reset_network_header(skb);
4009 skb_reset_transport_header(skb);
3b8d81e0 4010
3a25a8c8 4011 skb_set_queue_mapping(skb, ac);
cf6bb79a 4012 skb->priority = tid;
cf0277e7 4013
89afe614
JB		 4014 skb->dev = sdata->dev;
4015
3d34deb6
JB		 4016 /*
4017 * The other path calling ieee80211_xmit is from the tasklet,
4018 * and while we can handle concurrent transmissions locking
4019 * requirements are that we do not come into tx with bhs on.
4020 */
4021 local_bh_disable();
73c4e195 4022 IEEE80211_SKB_CB(skb)->band = band;
7c10770f 4023 ieee80211_xmit(sdata, NULL, skb);
3d34deb6 4024 local_bh_enable();
3b8d81e0 4025}
Linux kernel - Deliverables
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