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cfg80211: introduce critical protocol indication from user-space
[linux-2.6-block.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/skbuff.h>
18#include <linux/etherdevice.h>
19#include <linux/bitmap.h>
d4e46a3d 20#include <linux/rcupdate.h>
bc3b2d7f 21#include <linux/export.h>
881d966b 22#include <net/net_namespace.h>
e2ebc74d
JB		 23#include <net/ieee80211_radiotap.h>
24#include <net/cfg80211.h>
25#include <net/mac80211.h>
26#include <asm/unaligned.h>
27
28#include "ieee80211_i.h"
24487981 29#include "driver-ops.h"
2c8dccc7 30#include "led.h"
33b64eb2 31#include "mesh.h"
e2ebc74d
JB		 32#include "wep.h"
33#include "wpa.h"
34#include "wme.h"
2c8dccc7 35#include "rate.h"
e2ebc74d 36
e2ebc74d
JB		 37/* misc utils */
38
252b86c4
JB		 39static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
03f93c3d 41 int next_frag_len)
e2ebc74d
JB		 42{
43 int rate, mrate, erp, dur, i;
2e92e6f2 44 struct ieee80211_rate *txrate;
e2ebc74d 45 struct ieee80211_local *local = tx->local;
8318d78a 46 struct ieee80211_supported_band *sband;
358c8d9d 47 struct ieee80211_hdr *hdr;
252b86c4 48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e6a9854b
JB		 49
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
52 return 0;
53
54 /* uh huh? */
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
56 return 0;
e2ebc74d 57
2d56577b 58 sband = local->hw.wiphy->bands[info->band];
e6a9854b 59 txrate = &sband->bitrates[info->control.rates[0].idx];
8318d78a 60
e6a9854b 61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 62
63 /*
64 * data and mgmt (except PS Poll):
65 * - during CFP: 32768
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
72 *
73 * IEEE 802.11, 9.6:
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
78 * BSSBasicRateSet
79 */
252b86c4 80 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 81 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 82 /* TODO: These control frames are not currently sent by
ccd7b362 83 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 84 * needs to be updated to support duration field calculation.
85 *
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
93 * and its SIFS
94 * PS Poll: BIT(15) | BIT(14) | aid
95 */
96 return 0;
97 }
98
99 /* data/mgmt */
100 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 101 return cpu_to_le16(32768);
e2ebc74d
JB		 102
103 if (group_addr) /* Group address as the destination - no ACK */
104 return 0;
105
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
115 */
116 rate = -1;
8318d78a
JB		 117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 121
8318d78a
JB		 122 if (r->bitrate > txrate->bitrate)
123 break;
e2ebc74d 124
bda3933a 125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
8318d78a
JB		 126 rate = r->bitrate;
127
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
130 u32 flag;
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
133 else
134 flag = IEEE80211_RATE_MANDATORY_B;
135 if (r->flags & flag)
136 mrate = r->bitrate;
137 break;
138 }
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
141 mrate = r->bitrate;
142 break;
3a0c52a6
VK		 143 case IEEE80211_BAND_60GHZ:
144 /* TODO, for now fall through */
8318d78a
JB		 145 case IEEE80211_NUM_BANDS:
146 WARN_ON(1);
147 break;
148 }
e2ebc74d
JB		 149 }
150 if (rate == -1) {
151 /* No matching basic rate found; use highest suitable mandatory
152 * PHY rate */
153 rate = mrate;
154 }
155
6674f210
SW		 156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr->frame_control) &&
c26a0e10 158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
6674f210
SW		 159 dur = 0;
160 else
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
4ee73f33 164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
bda3933a 165 tx->sdata->vif.bss_conf.use_short_preamble);
e2ebc74d
JB		 166
167 if (next_frag_len) {
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur *= 2; /* ACK + SIFS */
171 /* next fragment */
4ee73f33 172 dur += ieee80211_frame_duration(sband->band, next_frag_len,
8318d78a 173 txrate->bitrate, erp,
bda3933a 174 tx->sdata->vif.bss_conf.use_short_preamble);
e2ebc74d
JB		 175 }
176
03f93c3d 177 return cpu_to_le16(dur);
e2ebc74d
JB		 178}
179
e2ebc74d 180/* tx handlers */
5c1b98a5
KV		 181static ieee80211_tx_result debug_noinline
182ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
183{
184 struct ieee80211_local *local = tx->local;
0c74211d 185 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 186
187 /* driver doesn't support power save */
188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
189 return TX_CONTINUE;
190
191 /* hardware does dynamic power save */
192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
193 return TX_CONTINUE;
194
195 /* dynamic power save disabled */
196 if (local->hw.conf.dynamic_ps_timeout <= 0)
197 return TX_CONTINUE;
198
199 /* we are scanning, don't enable power save */
200 if (local->scanning)
201 return TX_CONTINUE;
202
203 if (!local->ps_sdata)
204 return TX_CONTINUE;
205
206 /* No point if we're going to suspend */
207 if (local->quiescing)
208 return TX_CONTINUE;
209
0c74211d
KV		 210 /* dynamic ps is supported only in managed mode */
211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
212 return TX_CONTINUE;
213
214 ifmgd = &tx->sdata->u.mgd;
215
216 /*
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
223 * peer application.
224 *
dc41e4d4 225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
0c74211d
KV		 226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
228 */
4875d30d
JB		 229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
0c74211d
KV		 232 return TX_CONTINUE;
233
5c1b98a5
KV		 234 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
235 ieee80211_stop_queues_by_reason(&local->hw,
445ea4e8 236 IEEE80211_MAX_QUEUE_MAP,
5c1b98a5 237 IEEE80211_QUEUE_STOP_REASON_PS);
db28569a 238 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
241 }
242
5db1c07c
LC		 243 /* Don't restart the timer if we're not disassociated */
244 if (!ifmgd->associated)
245 return TX_CONTINUE;
246
5c1b98a5
KV		 247 mod_timer(&local->dynamic_ps_timer, jiffies +
248 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
249
250 return TX_CONTINUE;
251}
e2ebc74d 252
d9e8a70f 253static ieee80211_tx_result debug_noinline
5cf121c3 254ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 255{
358c8d9d 256
e039fa4a 257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 259 bool assoc = false;
e2ebc74d 260
e039fa4a 261 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 262 return TX_CONTINUE;
58d4185e 263
b23b025f
BG		 264 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
265 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 266 !ieee80211_is_probe_req(hdr->frame_control) &&
267 !ieee80211_is_nullfunc(hdr->frame_control))
268 /*
269 * When software scanning only nullfunc frames (to notify
270 * the sleep state to the AP) and probe requests (for the
271 * active scan) are allowed, all other frames should not be
272 * sent and we should not get here, but if we do
273 * nonetheless, drop them to avoid sending them
274 * off-channel. See the link below and
275 * ieee80211_start_scan() for more.
276 *
277 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
278 */
9ae54c84 279 return TX_DROP;
e2ebc74d 280
1be7fe8d
BJ		 281 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
282 return TX_CONTINUE;
283
05c914fe 284 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
33b64eb2
LCC		 285 return TX_CONTINUE;
286
5cf121c3 287 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 288 return TX_CONTINUE;
e2ebc74d 289
c2c98fde
JB		 290 if (tx->sta)
291 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 292
5cf121c3 293 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 294 if (unlikely(!assoc &&
358c8d9d 295 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d 296#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0
JB		 297 sdata_info(tx->sdata,
298 "dropped data frame to not associated station %pM\n",
299 hdr->addr1);
300#endif
e2ebc74d 301 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 302 return TX_DROP;
e2ebc74d 303 }
29623892
JB		 304 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
305 ieee80211_is_data(hdr->frame_control) &&
030ef8f8 306 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
29623892
JB		 307 /*
308 * No associated STAs - no need to send multicast
309 * frames.
310 */
311 return TX_DROP;
e2ebc74d
JB		 312 }
313
9ae54c84 314 return TX_CONTINUE;
e2ebc74d
JB		 315}
316
e2ebc74d
JB		 317/* This function is called whenever the AP is about to exceed the maximum limit
318 * of buffered frames for power saving STAs. This situation should not really
319 * happen often during normal operation, so dropping the oldest buffered packet
320 * from each queue should be OK to make some room for new frames. */
321static void purge_old_ps_buffers(struct ieee80211_local *local)
322{
323 int total = 0, purged = 0;
324 struct sk_buff *skb;
325 struct ieee80211_sub_if_data *sdata;
326 struct sta_info *sta;
327
79010420 328 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
d012a605
MP		 329 struct ps_data *ps;
330
331 if (sdata->vif.type == NL80211_IFTYPE_AP)
332 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 333 else if (ieee80211_vif_is_mesh(&sdata->vif))
334 ps = &sdata->u.mesh.ps;
d012a605 335 else
e2ebc74d 336 continue;
d012a605
MP		 337
338 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d
JB		 339 if (skb) {
340 purged++;
341 dev_kfree_skb(skb);
342 }
d012a605 343 total += skb_queue_len(&ps->bc_buf);
e2ebc74d 344 }
e2ebc74d 345
948d887d
JB		 346 /*
347 * Drop one frame from each station from the lowest-priority
348 * AC that has frames at all.
349 */
d0709a65 350 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 351 int ac;
352
353 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
354 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
355 total += skb_queue_len(&sta->ps_tx_buf[ac]);
356 if (skb) {
357 purged++;
c3e7724b 358 ieee80211_free_txskb(&local->hw, skb);
948d887d
JB		 359 break;
360 }
e2ebc74d 361 }
e2ebc74d 362 }
d0709a65 363
e2ebc74d 364 local->total_ps_buffered = total;
bdcbd8e0 365 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
e2ebc74d
JB		 366}
367
9ae54c84 368static ieee80211_tx_result
5cf121c3 369ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 370{
e039fa4a 371 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 372 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d012a605 373 struct ps_data *ps;
e039fa4a 374
7d54d0dd
JB		 375 /*
376 * broadcast/multicast frame
377 *
3f52b7e3 378 * If any of the associated/peer stations is in power save mode,
7d54d0dd
JB		 379 * the frame is buffered to be sent after DTIM beacon frame.
380 * This is done either by the hardware or us.
381 */
382
3f52b7e3 383 /* powersaving STAs currently only in AP/VLAN/mesh mode */
d012a605
MP		 384 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
385 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
386 if (!tx->sdata->bss)
387 return TX_CONTINUE;
388
389 ps = &tx->sdata->bss->ps;
3f52b7e3
MP		 390 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
391 ps = &tx->sdata->u.mesh.ps;
d012a605 392 } else {
3e122be0 393 return TX_CONTINUE;
d012a605
MP		 394 }
395
3e122be0
JB		 396
397 /* no buffering for ordered frames */
358c8d9d 398 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 399 return TX_CONTINUE;
7d54d0dd
JB		 400
401 /* no stations in PS mode */
d012a605 402 if (!atomic_read(&ps->num_sta_ps))
9ae54c84 403 return TX_CONTINUE;
7d54d0dd 404
62b517cb 405 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
3a25a8c8
JB		 406 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
407 info->hw_queue = tx->sdata->vif.cab_queue;
62b1208e 408
62b517cb
JB		 409 /* device releases frame after DTIM beacon */
410 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
62b1208e 411 return TX_CONTINUE;
62b1208e 412
7d54d0dd 413 /* buffered in mac80211 */
62b1208e
JB		 414 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
415 purge_old_ps_buffers(tx->local);
416
d012a605 417 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
bdcbd8e0
JB		 418 ps_dbg(tx->sdata,
419 "BC TX buffer full - dropping the oldest frame\n");
d012a605 420 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
62b1208e
JB		 421 } else
422 tx->local->total_ps_buffered++;
e2ebc74d 423
d012a605 424 skb_queue_tail(&ps->bc_buf, tx->skb);
7d54d0dd 425
62b1208e 426 return TX_QUEUED;
e2ebc74d
JB		 427}
428
fb733336
JM		 429static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
430 struct sk_buff *skb)
431{
432 if (!ieee80211_is_mgmt(fc))
433 return 0;
434
c2c98fde 435 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 436 return 0;
437
438 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
439 skb->data))
440 return 0;
441
442 return 1;
443}
444
9ae54c84 445static ieee80211_tx_result
5cf121c3 446ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 447{
448 struct sta_info *sta = tx->sta;
e039fa4a 449 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 450 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 451 struct ieee80211_local *local = tx->local;
e2ebc74d 452
02f2f1a9 453 if (unlikely(!sta))
9ae54c84 454 return TX_CONTINUE;
e2ebc74d 455
c2c98fde
JB		 456 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
457 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
02f2f1a9 458 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
948d887d
JB		 459 int ac = skb_get_queue_mapping(tx->skb);
460
02f2f1a9
JB		 461 /* only deauth, disassoc and action are bufferable MMPDUs */
462 if (ieee80211_is_mgmt(hdr->frame_control) &&
463 !ieee80211_is_deauth(hdr->frame_control) &&
464 !ieee80211_is_disassoc(hdr->frame_control) &&
465 !ieee80211_is_action(hdr->frame_control)) {
466 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
467 return TX_CONTINUE;
468 }
469
bdcbd8e0
JB		 470 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
471 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d
JB		 472 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
473 purge_old_ps_buffers(tx->local);
948d887d
JB		 474 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
475 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
bdcbd8e0
JB		 476 ps_dbg(tx->sdata,
477 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
478 sta->sta.addr, ac);
c3e7724b 479 ieee80211_free_txskb(&local->hw, old);
e2ebc74d
JB		 480 } else
481 tx->local->total_ps_buffered++;
004c872e 482
e039fa4a 483 info->control.jiffies = jiffies;
5061b0c2 484 info->control.vif = &tx->sdata->vif;
8f77f384 485 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
948d887d 486 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
3393a608
JO		 487
488 if (!timer_pending(&local->sta_cleanup))
489 mod_timer(&local->sta_cleanup,
490 round_jiffies(jiffies +
491 STA_INFO_CLEANUP_INTERVAL));
492
c868cb35
JB		 493 /*
494 * We queued up some frames, so the TIM bit might
495 * need to be set, recalculate it.
496 */
497 sta_info_recalc_tim(sta);
498
9ae54c84 499 return TX_QUEUED;
bdcbd8e0
JB		 500 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
501 ps_dbg(tx->sdata,
502 "STA %pM in PS mode, but polling/in SP -> send frame\n",
503 sta->sta.addr);
e2ebc74d 504 }
e2ebc74d 505
9ae54c84 506 return TX_CONTINUE;
e2ebc74d
JB		 507}
508
d9e8a70f 509static ieee80211_tx_result debug_noinline
5cf121c3 510ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 511{
5cf121c3 512 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 513 return TX_CONTINUE;
e2ebc74d 514
5cf121c3 515 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 516 return ieee80211_tx_h_unicast_ps_buf(tx);
517 else
518 return ieee80211_tx_h_multicast_ps_buf(tx);
519}
520
a621fa4d
JB		 521static ieee80211_tx_result debug_noinline
522ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
523{
524 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
525
526 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
527 tx->sdata->control_port_no_encrypt))
528 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
529
530 return TX_CONTINUE;
531}
532
d9e8a70f 533static ieee80211_tx_result debug_noinline
5cf121c3 534ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 535{
46e6de15 536 struct ieee80211_key *key;
e039fa4a 537 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 538 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 539
3b8d81e0 540 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 541 tx->key = NULL;
e31b8213 542 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
d4e46a3d 543 tx->key = key;
3cfcf6ac 544 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324
JM		 545 is_multicast_ether_addr(hdr->addr1) &&
546 ieee80211_is_robust_mgmt_frame(hdr) &&
3cfcf6ac
JM		 547 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
548 tx->key = key;
f7e0104c
JB		 549 else if (is_multicast_ether_addr(hdr->addr1) &&
550 (key = rcu_dereference(tx->sdata->default_multicast_key)))
551 tx->key = key;
552 else if (!is_multicast_ether_addr(hdr->addr1) &&
553 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 554 tx->key = key;
46e6de15
JB		 555 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
556 tx->key = NULL;
557 else if (!tx->sdata->drop_unencrypted)
558 tx->key = NULL;
559 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
560 tx->key = NULL;
561 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
562 !(ieee80211_is_action(hdr->frame_control) &&
563 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
564 tx->key = NULL;
4922f71f
NC		 565 else if (ieee80211_is_mgmt(hdr->frame_control) &&
566 !ieee80211_is_robust_mgmt_frame(hdr))
567 tx->key = NULL;
46e6de15 568 else {
e2ebc74d 569 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
9ae54c84 570 return TX_DROP;
46e6de15 571 }
e2ebc74d
JB		 572
573 if (tx->key) {
813d7669
JB		 574 bool skip_hw = false;
575
e2ebc74d 576 tx->key->tx_rx_count++;
011bfcc4 577 /* TODO: add threshold stuff again */
176e4f84 578
97359d12
JB		 579 switch (tx->key->conf.cipher) {
580 case WLAN_CIPHER_SUITE_WEP40:
581 case WLAN_CIPHER_SUITE_WEP104:
97359d12 582 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 583 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 584 tx->key = NULL;
585 break;
97359d12 586 case WLAN_CIPHER_SUITE_CCMP:
fb733336
JM		 587 if (!ieee80211_is_data_present(hdr->frame_control) &&
588 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
589 tx->skb))
590 tx->key = NULL;
3b43a187
KV		 591 else
592 skip_hw = (tx->key->conf.flags &
e548c49e 593 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 594 ieee80211_is_mgmt(hdr->frame_control);
fb733336 595 break;
97359d12 596 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 597 if (!ieee80211_is_mgmt(hdr->frame_control))
598 tx->key = NULL;
599 break;
176e4f84 600 }
813d7669 601
e54faf29
JB		 602 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
603 !ieee80211_is_deauth(hdr->frame_control)))
95acac61
JB		 604 return TX_DROP;
605
f12553eb 606 if (!skip_hw && tx->key &&
382b1655 607 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 608 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 609 }
610
9ae54c84 611 return TX_CONTINUE;
e2ebc74d
JB		 612}
613
d9e8a70f 614static ieee80211_tx_result debug_noinline
5cf121c3 615ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 616{
e039fa4a 617 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 618 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
619 struct ieee80211_supported_band *sband;
620 struct ieee80211_rate *rate;
a2c40249
SZ		 621 int i;
622 u32 len;
e6a9854b
JB		 623 bool inval = false, rts = false, short_preamble = false;
624 struct ieee80211_tx_rate_control txrc;
c2c98fde 625 bool assoc = false;
8318d78a 626
e6a9854b 627 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 628
2d56577b 629 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 630
a2c40249 631 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 632 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 633
634 /* set up the tx rate control struct we give the RC algo */
005e472b 635 txrc.hw = &tx->local->hw;
e6a9854b
JB		 636 txrc.sband = sband;
637 txrc.bss_conf = &tx->sdata->vif.bss_conf;
638 txrc.skb = tx->skb;
639 txrc.reported_rate.idx = -1;
2d56577b 640 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
37eb0b16
JM		 641 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
642 txrc.max_rate_idx = -1;
643 else
644 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2ffbe6d3
FF		 645
646 if (tx->sdata->rc_has_mcs_mask[info->band])
647 txrc.rate_idx_mcs_mask =
648 tx->sdata->rc_rateidx_mcs_mask[info->band];
649
8f0729b1 650 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 651 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
8f0729b1 652 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
e6a9854b
JB		 653
654 /* set up RTS protection if desired */
b9a5f8ca 655 if (len > tx->local->hw.wiphy->rts_threshold) {
e6a9854b 656 txrc.rts = rts = true;
e2ebc74d 657 }
e2ebc74d 658
991fec09
FF		 659 info->control.use_rts = rts;
660 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
661
e6a9854b
JB		 662 /*
663 * Use short preamble if the BSS can handle it, but not for
664 * management frames unless we know the receiver can handle
665 * that -- the management frame might be to a station that
666 * just wants a probe response.
667 */
668 if (tx->sdata->vif.bss_conf.use_short_preamble &&
669 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 670 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
e6a9854b 671 txrc.short_preamble = short_preamble = true;
e2ebc74d 672
c2c98fde
JB		 673 if (tx->sta)
674 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 675
676 /*
677 * Lets not bother rate control if we're associated and cannot
678 * talk to the sta. This should not happen.
679 */
c2c98fde 680 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 681 !rate_usable_index_exists(sband, &tx->sta->sta),
682 "%s: Dropped data frame as no usable bitrate found while "
683 "scanning and associated. Target station: "
684 "%pM on %d GHz band\n",
47846c9b 685 tx->sdata->name, hdr->addr1,
2d56577b 686 info->band ? 5 : 2))
b770b43e 687 return TX_DROP;
2e92e6f2 688
b770b43e
LR		 689 /*
690 * If we're associated with the sta at this point we know we can at
691 * least send the frame at the lowest bit rate.
692 */
e6a9854b
JB		 693 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
694
695 if (unlikely(info->control.rates[0].idx < 0))
696 return TX_DROP;
697
c1ce5a74 698 if (txrc.reported_rate.idx < 0) {
e6a9854b 699 txrc.reported_rate = info->control.rates[0];
c1ce5a74
HS		 700 if (tx->sta && ieee80211_is_data(hdr->frame_control))
701 tx->sta->last_tx_rate = txrc.reported_rate;
702 } else if (tx->sta)
e6a9854b 703 tx->sta->last_tx_rate = txrc.reported_rate;
e039fa4a 704
e6a9854b
JB		 705 if (unlikely(!info->control.rates[0].count))
706 info->control.rates[0].count = 1;
e2ebc74d 707
9955151d
GS		 708 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
709 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
710 info->control.rates[0].count = 1;
711
e6a9854b
JB		 712 if (is_multicast_ether_addr(hdr->addr1)) {
713 /*
714 * XXX: verify the rate is in the basic rateset
715 */
716 return TX_CONTINUE;
e2ebc74d
JB		 717 }
718
e6a9854b 719 /*
5253ffb8
KB		 720 * Set up the RTS/CTS rate as the fastest basic rate
721 * that is not faster than the data rate unless there
722 * is no basic rate slower than the data rate, in which
723 * case we pick the slowest basic rate
e6a9854b
JB		 724 *
725 * XXX: Should this check all retry rates?
726 */
727 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
5253ffb8
KB		 728 u32 basic_rates = tx->sdata->vif.bss_conf.basic_rates;
729 s8 baserate = basic_rates ? ffs(basic_rates - 1) : 0;
e6a9854b
JB		 730
731 rate = &sband->bitrates[info->control.rates[0].idx];
732
733 for (i = 0; i < sband->n_bitrates; i++) {
734 /* must be a basic rate */
5253ffb8 735 if (!(basic_rates & BIT(i)))
e6a9854b
JB		 736 continue;
737 /* must not be faster than the data rate */
738 if (sband->bitrates[i].bitrate > rate->bitrate)
739 continue;
740 /* maximum */
741 if (sband->bitrates[baserate].bitrate <
742 sband->bitrates[i].bitrate)
743 baserate = i;
744 }
745
746 info->control.rts_cts_rate_idx = baserate;
7e9ed188
DD		 747 }
748
e6a9854b 749 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
fbd647b1
KB		 750 struct ieee80211_tx_rate *rc_rate = &info->control.rates[i];
751
e6a9854b
JB		 752 /*
753 * make sure there's no valid rate following
754 * an invalid one, just in case drivers don't
755 * take the API seriously to stop at -1.
756 */
757 if (inval) {
fbd647b1 758 rc_rate->idx = -1;
e6a9854b
JB		 759 continue;
760 }
fbd647b1 761 if (rc_rate->idx < 0) {
e6a9854b
JB		 762 inval = true;
763 continue;
764 }
8318d78a 765
e6a9854b
JB		 766 /*
767 * For now assume MCS is already set up correctly, this
768 * needs to be fixed.
769 */
fbd647b1
KB		 770 if (rc_rate->flags & IEEE80211_TX_RC_MCS) {
771 WARN_ON(rc_rate->idx > 76);
991fec09
FF		 772
773 if (!(rc_rate->flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
774 tx->sdata->vif.bss_conf.use_cts_prot)
775 rc_rate->flags |=
776 IEEE80211_TX_RC_USE_CTS_PROTECT;
fbd647b1
KB		 777 continue;
778 }
779
780 if (rc_rate->flags & IEEE80211_TX_RC_VHT_MCS) {
781 WARN_ON(ieee80211_rate_get_vht_mcs(rc_rate) > 9);
e6a9854b
JB		 782 continue;
783 }
e2ebc74d 784
e6a9854b
JB		 785 /* set up RTS protection if desired */
786 if (rts)
fbd647b1 787 rc_rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
8318d78a 788
e6a9854b 789 /* RC is busted */
fbd647b1
KB		 790 if (WARN_ON_ONCE(rc_rate->idx >= sband->n_bitrates)) {
791 rc_rate->idx = -1;
e6a9854b 792 continue;
8318d78a 793 }
e2ebc74d 794
fbd647b1 795 rate = &sband->bitrates[rc_rate->idx];
e6a9854b
JB		 796
797 /* set up short preamble */
798 if (short_preamble &&
799 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
fbd647b1 800 rc_rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
e6a9854b
JB		 801
802 /* set up G protection */
803 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
804 rate->flags & IEEE80211_RATE_ERP_G)
fbd647b1 805 rc_rate->flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
e2ebc74d
JB		 806 }
807
e6a9854b
JB		 808 return TX_CONTINUE;
809}
810
f591fa5d
JB		 811static ieee80211_tx_result debug_noinline
812ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
813{
814 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
815 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
816 u16 *seq;
817 u8 *qc;
818 int tid;
819
25d834e1
JB		 820 /*
821 * Packet injection may want to control the sequence
822 * number, if we have no matching interface then we
823 * neither assign one ourselves nor ask the driver to.
824 */
5061b0c2 825 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 826 return TX_CONTINUE;
827
f591fa5d
JB		 828 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
829 return TX_CONTINUE;
830
831 if (ieee80211_hdrlen(hdr->frame_control) < 24)
832 return TX_CONTINUE;
833
49a59543
JB		 834 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
835 return TX_CONTINUE;
836
94778280
JB		 837 /*
838 * Anything but QoS data that has a sequence number field
839 * (is long enough) gets a sequence number from the global
840 * counter.
841 */
f591fa5d 842 if (!ieee80211_is_data_qos(hdr->frame_control)) {
94778280 843 /* driver should assign sequence number */
f591fa5d 844 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 845 /* for pure STA mode without beacons, we can do it */
846 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
847 tx->sdata->sequence_number += 0x10;
f591fa5d
JB		 848 return TX_CONTINUE;
849 }
850
851 /*
852 * This should be true for injected/management frames only, for
853 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
854 * above since they are not QoS-data frames.
855 */
856 if (!tx->sta)
857 return TX_CONTINUE;
858
859 /* include per-STA, per-TID sequence counter */
860
861 qc = ieee80211_get_qos_ctl(hdr);
862 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
863 seq = &tx->sta->tid_seq[tid];
864
865 hdr->seq_ctrl = cpu_to_le16(*seq);
866
867 /* Increase the sequence number. */
868 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
869
870 return TX_CONTINUE;
871}
872
252b86c4 873static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 874 struct sk_buff *skb, int hdrlen,
875 int frag_threshold)
876{
252b86c4 877 struct ieee80211_local *local = tx->local;
a1a3fcec 878 struct ieee80211_tx_info *info;
252b86c4 879 struct sk_buff *tmp;
2de8e0d9
JB		 880 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
881 int pos = hdrlen + per_fragm;
882 int rem = skb->len - hdrlen - per_fragm;
883
884 if (WARN_ON(rem < 0))
885 return -EINVAL;
886
252b86c4
JB		 887 /* first fragment was already added to queue by caller */
888
2de8e0d9
JB		 889 while (rem) {
890 int fraglen = per_fragm;
891
892 if (fraglen > rem)
893 fraglen = rem;
894 rem -= fraglen;
895 tmp = dev_alloc_skb(local->tx_headroom +
896 frag_threshold +
897 IEEE80211_ENCRYPT_HEADROOM +
898 IEEE80211_ENCRYPT_TAILROOM);
899 if (!tmp)
900 return -ENOMEM;
252b86c4
JB		 901
902 __skb_queue_tail(&tx->skbs, tmp);
903
2de8e0d9
JB		 904 skb_reserve(tmp, local->tx_headroom +
905 IEEE80211_ENCRYPT_HEADROOM);
906 /* copy control information */
907 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 908
909 info = IEEE80211_SKB_CB(tmp);
910 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
911 IEEE80211_TX_CTL_FIRST_FRAGMENT);
912
913 if (rem)
914 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
915
2de8e0d9
JB		 916 skb_copy_queue_mapping(tmp, skb);
917 tmp->priority = skb->priority;
2de8e0d9 918 tmp->dev = skb->dev;
2de8e0d9
JB		 919
920 /* copy header and data */
921 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
922 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
923
924 pos += fraglen;
925 }
926
252b86c4 927 /* adjust first fragment's length */
2de8e0d9
JB		 928 skb->len = hdrlen + per_fragm;
929 return 0;
930}
931
d9e8a70f 932static ieee80211_tx_result debug_noinline
e2454948
JB		 933ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
934{
2de8e0d9
JB		 935 struct sk_buff *skb = tx->skb;
936 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
937 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 938 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 939 int hdrlen;
940 int fragnum;
e2454948 941
252b86c4
JB		 942 /* no matter what happens, tx->skb moves to tx->skbs */
943 __skb_queue_tail(&tx->skbs, skb);
944 tx->skb = NULL;
945
a26eb27a
JB		 946 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
947 return TX_CONTINUE;
948
949 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 950 return TX_CONTINUE;
951
eefce91a
JB		 952 /*
953 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 954 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 955 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 956 */
8b30b1fe 957 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 958 return TX_DROP;
959
065e9605 960 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 961
a26eb27a 962 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 963 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 964 return TX_DROP;
e6a9854b 965
2de8e0d9
JB		 966 /*
967 * Now fragment the frame. This will allocate all the fragments and
968 * chain them (using skb as the first fragment) to skb->next.
969 * During transmission, we will remove the successfully transmitted
970 * fragments from this list. When the low-level driver rejects one
971 * of the fragments then we will simply pretend to accept the skb
972 * but store it away as pending.
973 */
252b86c4 974 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 975 return TX_DROP;
e6a9854b 976
2de8e0d9
JB		 977 /* update duration/seq/flags of fragments */
978 fragnum = 0;
252b86c4
JB		 979
980 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 981 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 982
2de8e0d9
JB		 983 hdr = (void *)skb->data;
984 info = IEEE80211_SKB_CB(skb);
e6a9854b 985
252b86c4 986 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 987 hdr->frame_control |= morefrags;
e6a9854b
JB		 988 /*
989 * No multi-rate retries for fragmented frames, that
990 * would completely throw off the NAV at other STAs.
991 */
992 info->control.rates[1].idx = -1;
993 info->control.rates[2].idx = -1;
994 info->control.rates[3].idx = -1;
e3e1a0bc 995 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 996 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 997 } else {
998 hdr->frame_control &= ~morefrags;
e6a9854b 999 }
2de8e0d9
JB		 1000 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1001 fragnum++;
252b86c4 1002 }
e2ebc74d 1003
9ae54c84 1004 return TX_CONTINUE;
e2ebc74d
JB		 1005}
1006
feff1f2f
JB		 1007static ieee80211_tx_result debug_noinline
1008ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1009{
252b86c4 1010 struct sk_buff *skb;
560d2682 1011 int ac = -1;
feff1f2f
JB		 1012
1013 if (!tx->sta)
1014 return TX_CONTINUE;
1015
252b86c4 1016 skb_queue_walk(&tx->skbs, skb) {
560d2682 1017 ac = skb_get_queue_mapping(skb);
feff1f2f 1018 tx->sta->tx_fragments++;
560d2682 1019 tx->sta->tx_bytes[ac] += skb->len;
252b86c4 1020 }
560d2682
JB		 1021 if (ac >= 0)
1022 tx->sta->tx_packets[ac]++;
feff1f2f
JB		 1023
1024 return TX_CONTINUE;
1025}
1026
d9e8a70f 1027static ieee80211_tx_result debug_noinline
e2454948
JB		 1028ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1029{
1030 if (!tx->key)
1031 return TX_CONTINUE;
1032
97359d12
JB		 1033 switch (tx->key->conf.cipher) {
1034 case WLAN_CIPHER_SUITE_WEP40:
1035 case WLAN_CIPHER_SUITE_WEP104:
e2454948 1036 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1037 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1038 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1039 case WLAN_CIPHER_SUITE_CCMP:
e2454948 1040 return ieee80211_crypto_ccmp_encrypt(tx);
97359d12 1041 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1042 return ieee80211_crypto_aes_cmac_encrypt(tx);
3ffc2a90 1043 default:
d32a1028 1044 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1045 }
1046
e2454948
JB		 1047 return TX_DROP;
1048}
1049
d9e8a70f 1050static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1051ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1052{
252b86c4 1053 struct sk_buff *skb;
2de8e0d9
JB		 1054 struct ieee80211_hdr *hdr;
1055 int next_len;
1056 bool group_addr;
03f93c3d 1057
252b86c4 1058 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1059 hdr = (void *) skb->data;
7e0aae47
JM		 1060 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1061 break; /* must not overwrite AID */
252b86c4
JB		 1062 if (!skb_queue_is_last(&tx->skbs, skb)) {
1063 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1064 next_len = next->len;
1065 } else
1066 next_len = 0;
2de8e0d9 1067 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1068
2de8e0d9 1069 hdr->duration_id =
252b86c4
JB		 1070 ieee80211_duration(tx, skb, group_addr, next_len);
1071 }
03f93c3d
JB		 1072
1073 return TX_CONTINUE;
1074}
1075
e2ebc74d
JB		 1076/* actual transmit path */
1077
a622ab72
JB		 1078static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1079 struct sk_buff *skb,
1080 struct ieee80211_tx_info *info,
1081 struct tid_ampdu_tx *tid_tx,
1082 int tid)
1083{
1084 bool queued = false;
285fa695 1085 bool reset_agg_timer = false;
aa454580 1086 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1087
1088 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1089 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1090 reset_agg_timer = true;
0ab33703
JB		 1091 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1092 /*
1093 * nothing -- this aggregation session is being started
1094 * but that might still fail with the driver
1095 */
a622ab72
JB		 1096 } else {
1097 spin_lock(&tx->sta->lock);
1098 /*
1099 * Need to re-check now, because we may get here
1100 *
1101 * 1) in the window during which the setup is actually
1102 * already done, but not marked yet because not all
1103 * packets are spliced over to the driver pending
1104 * queue yet -- if this happened we acquire the lock
1105 * either before or after the splice happens, but
1106 * need to recheck which of these cases happened.
1107 *
1108 * 2) during session teardown, if the OPERATIONAL bit
1109 * was cleared due to the teardown but the pointer
1110 * hasn't been assigned NULL yet (or we loaded it
1111 * before it was assigned) -- in this case it may
1112 * now be NULL which means we should just let the
1113 * packet pass through because splicing the frames
1114 * back is already done.
1115 */
40b275b6 1116 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1117
1118 if (!tid_tx) {
1119 /* do nothing, let packet pass through */
1120 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1122 reset_agg_timer = true;
a622ab72
JB		 1123 } else {
1124 queued = true;
1125 info->control.vif = &tx->sdata->vif;
1126 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1127 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1128 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1129 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1130 }
1131 spin_unlock(&tx->sta->lock);
aa454580
HS		 1132
1133 if (purge_skb)
c3e7724b 1134 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1135 }
1136
285fa695
NM		 1137 /* reset session timer */
1138 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1139 tid_tx->last_tx = jiffies;
285fa695 1140
a622ab72
JB		 1141 return queued;
1142}
1143
58d4185e
JB		 1144/*
1145 * initialises @tx
1146 */
9ae54c84 1147static ieee80211_tx_result
3b8d81e0
JB		 1148ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1149 struct ieee80211_tx_data *tx,
1150 struct sk_buff *skb)
e2ebc74d 1151{
3b8d81e0 1152 struct ieee80211_local *local = sdata->local;
58d4185e 1153 struct ieee80211_hdr *hdr;
e039fa4a 1154 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1155 int tid;
a622ab72 1156 u8 *qc;
e2ebc74d
JB		 1157
1158 memset(tx, 0, sizeof(*tx));
1159 tx->skb = skb;
e2ebc74d 1160 tx->local = local;
3b8d81e0 1161 tx->sdata = sdata;
252b86c4 1162 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1163
cd8ffc80
JB		 1164 /*
1165 * If this flag is set to true anywhere, and we get here,
1166 * we are doing the needed processing, so remove the flag
1167 * now.
1168 */
1169 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1170
58d4185e
JB		 1171 hdr = (struct ieee80211_hdr *) skb->data;
1172
3f0e0b22 1173 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
f14543ee 1174 tx->sta = rcu_dereference(sdata->u.vlan.sta);
3f0e0b22
FF		 1175 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1176 return TX_DROP;
66f2c99a
FF		 1177 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1178 tx->sdata->control_port_protocol == tx->skb->protocol) {
b4d57adb 1179 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
3f0e0b22 1180 }
f14543ee 1181 if (!tx->sta)
abe60632 1182 tx->sta = sta_info_get(sdata, hdr->addr1);
58d4185e 1183
cd8ffc80 1184 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1185 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
edf6b784
AN		 1186 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1187 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1188 struct tid_ampdu_tx *tid_tx;
1189
8b30b1fe
S		 1190 qc = ieee80211_get_qos_ctl(hdr);
1191 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1192
a622ab72
JB		 1193 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1194 if (tid_tx) {
1195 bool queued;
cd8ffc80 1196
a622ab72
JB		 1197 queued = ieee80211_tx_prep_agg(tx, skb, info,
1198 tid_tx, tid);
1199
1200 if (unlikely(queued))
1201 return TX_QUEUED;
1202 }
8b30b1fe
S		 1203 }
1204
badffb72 1205 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1206 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1207 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1208 } else
5cf121c3 1209 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1210
a26eb27a
JB		 1211 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1212 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1213 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1214 info->flags & IEEE80211_TX_CTL_AMPDU)
1215 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1216 }
1217
e2ebc74d 1218 if (!tx->sta)
e039fa4a 1219 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
c2c98fde 1220 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
e039fa4a 1221 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
58d4185e 1222
e039fa4a 1223 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1224
9ae54c84 1225 return TX_CONTINUE;
e2ebc74d
JB		 1226}
1227
11127e91
JB		 1228static bool ieee80211_tx_frags(struct ieee80211_local *local,
1229 struct ieee80211_vif *vif,
1230 struct ieee80211_sta *sta,
1231 struct sk_buff_head *skbs,
1232 bool txpending)
e2ebc74d 1233{
36323f81 1234 struct ieee80211_tx_control control;
252b86c4 1235 struct sk_buff *skb, *tmp;
3b8d81e0 1236 unsigned long flags;
e2ebc74d 1237
252b86c4 1238 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1239 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1240 int q = info->hw_queue;
1241
1242#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1243 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1244 __skb_unlink(skb, skbs);
c3e7724b 1245 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1246 continue;
1247 }
1248#endif
3b8d81e0
JB		 1249
1250 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1251 if (local->queue_stop_reasons[q] ||
7bb45683 1252 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1253 if (unlikely(info->flags &
a7679ed5
SF		 1254 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1255 if (local->queue_stop_reasons[q] &
1256 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1257 /*
1258 * Drop off-channel frames if queues
1259 * are stopped for any reason other
1260 * than off-channel operation. Never
1261 * queue them.
1262 */
1263 spin_unlock_irqrestore(
1264 &local->queue_stop_reason_lock,
1265 flags);
1266 ieee80211_purge_tx_queue(&local->hw,
1267 skbs);
1268 return true;
1269 }
1270 } else {
1271
6c17b77b 1272 /*
a7679ed5
SF		 1273 * Since queue is stopped, queue up frames for
1274 * later transmission from the tx-pending
1275 * tasklet when the queue is woken again.
6c17b77b 1276 */
a7679ed5
SF		 1277 if (txpending)
1278 skb_queue_splice_init(skbs,
1279 &local->pending[q]);
1280 else
1281 skb_queue_splice_tail_init(skbs,
1282 &local->pending[q]);
1283
1284 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1285 flags);
1286 return false;
6c17b77b 1287 }
7bb45683 1288 }
3b8d81e0 1289 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1290
11127e91 1291 info->control.vif = vif;
36323f81 1292 control.sta = sta;
f0e72851 1293
11127e91 1294 __skb_unlink(skb, skbs);
36323f81 1295 drv_tx(local, &control, skb);
11127e91 1296 }
5061b0c2 1297
11127e91
JB		 1298 return true;
1299}
1300
1301/*
1302 * Returns false if the frame couldn't be transmitted but was queued instead.
1303 */
1304static bool __ieee80211_tx(struct ieee80211_local *local,
1305 struct sk_buff_head *skbs, int led_len,
1306 struct sta_info *sta, bool txpending)
1307{
1308 struct ieee80211_tx_info *info;
1309 struct ieee80211_sub_if_data *sdata;
1310 struct ieee80211_vif *vif;
1311 struct ieee80211_sta *pubsta;
1312 struct sk_buff *skb;
1313 bool result = true;
1314 __le16 fc;
5061b0c2 1315
11127e91
JB		 1316 if (WARN_ON(skb_queue_empty(skbs)))
1317 return true;
ec25acc4 1318
11127e91
JB		 1319 skb = skb_peek(skbs);
1320 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1321 info = IEEE80211_SKB_CB(skb);
1322 sdata = vif_to_sdata(info->control.vif);
1323 if (sta && !sta->uploaded)
1324 sta = NULL;
1325
1326 if (sta)
1327 pubsta = &sta->sta;
1328 else
1329 pubsta = NULL;
1330
1331 switch (sdata->vif.type) {
1332 case NL80211_IFTYPE_MONITOR:
4b6f1dd6 1333 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1334 if (sdata) {
4b6f1dd6 1335 vif = &sdata->vif;
3a25a8c8
JB		 1336 info->hw_queue =
1337 vif->hw_queue[skb_get_queue_mapping(skb)];
1338 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1339 dev_kfree_skb(skb);
1340 return true;
1341 } else
4b6f1dd6 1342 vif = NULL;
11127e91
JB		 1343 break;
1344 case NL80211_IFTYPE_AP_VLAN:
1345 sdata = container_of(sdata->bss,
1346 struct ieee80211_sub_if_data, u.ap);
1347 /* fall through */
1348 default:
1349 vif = &sdata->vif;
1350 break;
e2ebc74d 1351 }
2de8e0d9 1352
cb831b53
JB		 1353 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1354 txpending);
11127e91 1355
74e4dbfd
JB		 1356 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1357 ieee80211_led_tx(local, 1);
1358
4db4e0a1 1359 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1360
11127e91 1361 return result;
e2ebc74d
JB		 1362}
1363
97b045d6
JB		 1364/*
1365 * Invoke TX handlers, return 0 on success and non-zero if the
1366 * frame was dropped or queued.
1367 */
1368static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1369{
252b86c4 1370 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1371 ieee80211_tx_result res = TX_DROP;
97b045d6 1372
9aa4aee3
JB		 1373#define CALL_TXH(txh) \
1374 do { \
1375 res = txh(tx); \
1376 if (res != TX_CONTINUE) \
1377 goto txh_done; \
1378 } while (0)
1379
5c1b98a5 1380 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1381 CALL_TXH(ieee80211_tx_h_check_assoc);
1382 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1383 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1384 CALL_TXH(ieee80211_tx_h_select_key);
af65cd96
JB		 1385 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1386 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1387
aa5b5492
JB		 1388 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1389 __skb_queue_tail(&tx->skbs, tx->skb);
1390 tx->skb = NULL;
c6fcf6bc 1391 goto txh_done;
aa5b5492 1392 }
c6fcf6bc
JB		 1393
1394 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1395 CALL_TXH(ieee80211_tx_h_sequence);
1396 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1397 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1398 CALL_TXH(ieee80211_tx_h_stats);
1399 CALL_TXH(ieee80211_tx_h_encrypt);
8fd369ee
AN		 1400 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1401 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1402#undef CALL_TXH
97b045d6 1403
d9e8a70f 1404 txh_done:
97b045d6 1405 if (unlikely(res == TX_DROP)) {
5479d0e7 1406 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1407 if (tx->skb)
c3e7724b 1408 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1409 else
1f98ab7f 1410 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1411 return -1;
1412 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1413 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1414 return -1;
1415 }
1416
1417 return 0;
1418}
1419
7bb45683
JB		 1420/*
1421 * Returns false if the frame couldn't be transmitted but was queued instead.
1422 */
1423static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
55de908a
JB		 1424 struct sk_buff *skb, bool txpending,
1425 enum ieee80211_band band)
e2ebc74d 1426{
3b8d81e0 1427 struct ieee80211_local *local = sdata->local;
5cf121c3 1428 struct ieee80211_tx_data tx;
97b045d6 1429 ieee80211_tx_result res_prepare;
e039fa4a 1430 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1431 bool result = true;
74e4dbfd 1432 int led_len;
e2ebc74d 1433
e2ebc74d
JB		 1434 if (unlikely(skb->len < 10)) {
1435 dev_kfree_skb(skb);
7bb45683 1436 return true;
e2ebc74d
JB		 1437 }
1438
58d4185e 1439 /* initialises tx */
74e4dbfd 1440 led_len = skb->len;
3b8d81e0 1441 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
e2ebc74d 1442
cd8ffc80 1443 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1444 ieee80211_free_txskb(&local->hw, skb);
55de908a 1445 return true;
cd8ffc80 1446 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1447 return true;
e2ebc74d
JB		 1448 }
1449
55de908a 1450 info->band = band;
e2ebc74d 1451
3a25a8c8
JB		 1452 /* set up hw_queue value early */
1453 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1454 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1455 info->hw_queue =
1456 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1457
7bb45683 1458 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1459 result = __ieee80211_tx(local, &tx.skbs, led_len,
1460 tx.sta, txpending);
55de908a 1461
7bb45683 1462 return result;
e2ebc74d
JB		 1463}
1464
1465/* device xmit handlers */
1466
3bff1865 1467static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1468 struct sk_buff *skb,
1469 int head_need, bool may_encrypt)
1470{
3bff1865 1471 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1472 int tail_need = 0;
1473
3bff1865 1474 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1475 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1476 tail_need -= skb_tailroom(skb);
1477 tail_need = max_t(int, tail_need, 0);
1478 }
1479
fc7c976d 1480 if (skb_cloned(skb))
23c0752a 1481 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1482 else if (head_need || tail_need)
23c0752a 1483 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1484 else
1485 return 0;
23c0752a
JB		 1486
1487 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1488 wiphy_debug(local->hw.wiphy,
1489 "failed to reallocate TX buffer\n");
23c0752a
JB		 1490 return -ENOMEM;
1491 }
1492
23c0752a
JB		 1493 return 0;
1494}
1495
55de908a
JB		 1496void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1497 enum ieee80211_band band)
e2ebc74d 1498{
3b8d81e0 1499 struct ieee80211_local *local = sdata->local;
e039fa4a 1500 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1501 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1502 int headroom;
23c0752a 1503 bool may_encrypt;
e2ebc74d 1504
3b8d81e0 1505 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1506
3b8d81e0 1507 headroom = local->tx_headroom;
23c0752a
JB		 1508 if (may_encrypt)
1509 headroom += IEEE80211_ENCRYPT_HEADROOM;
1510 headroom -= skb_headroom(skb);
1511 headroom = max_t(int, 0, headroom);
1512
3bff1865 1513 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1514 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1515 return;
e2ebc74d
JB		 1516 }
1517
740c1aa3 1518 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1519 info->control.vif = &sdata->vif;
e2ebc74d 1520
3f52b7e3
MP		 1521 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1522 if (ieee80211_is_data(hdr->frame_control) &&
1523 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1524 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1525 return; /* skb queued: don't free */
1526 } else {
1527 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1528 }
98aed9fd 1529 }
cca89496 1530
2154c81c 1531 ieee80211_set_qos_hdr(sdata, skb);
55de908a 1532 ieee80211_tx(sdata, skb, false, band);
e2ebc74d
JB		 1533}
1534
73b9f03a
JB		 1535static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1536{
1537 struct ieee80211_radiotap_iterator iterator;
1538 struct ieee80211_radiotap_header *rthdr =
1539 (struct ieee80211_radiotap_header *) skb->data;
1540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1541 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1542 NULL);
1543 u16 txflags;
1544
1545 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1546 IEEE80211_TX_CTL_DONTFRAG;
1547
1548 /*
1549 * for every radiotap entry that is present
1550 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1551 * entries present, or -EINVAL on error)
1552 */
1553
1554 while (!ret) {
1555 ret = ieee80211_radiotap_iterator_next(&iterator);
1556
1557 if (ret)
1558 continue;
1559
1560 /* see if this argument is something we can use */
1561 switch (iterator.this_arg_index) {
1562 /*
1563 * You must take care when dereferencing iterator.this_arg
1564 * for multibyte types... the pointer is not aligned. Use
1565 * get_unaligned((type *)iterator.this_arg) to dereference
1566 * iterator.this_arg for type "type" safely on all arches.
1567 */
1568 case IEEE80211_RADIOTAP_FLAGS:
1569 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1570 /*
1571 * this indicates that the skb we have been
1572 * handed has the 32-bit FCS CRC at the end...
1573 * we should react to that by snipping it off
1574 * because it will be recomputed and added
1575 * on transmission
1576 */
1577 if (skb->len < (iterator._max_length + FCS_LEN))
1578 return false;
1579
1580 skb_trim(skb, skb->len - FCS_LEN);
1581 }
1582 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1583 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1584 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1585 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1586 break;
1587
1588 case IEEE80211_RADIOTAP_TX_FLAGS:
1589 txflags = get_unaligned_le16(iterator.this_arg);
1590 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1591 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1592 break;
1593
1594 /*
1595 * Please update the file
1596 * Documentation/networking/mac80211-injection.txt
1597 * when parsing new fields here.
1598 */
1599
1600 default:
1601 break;
1602 }
1603 }
1604
1605 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1606 return false;
1607
1608 /*
1609 * remove the radiotap header
1610 * iterator->_max_length was sanity-checked against
1611 * skb->len by iterator init
1612 */
1613 skb_pull(skb, iterator._max_length);
1614
1615 return true;
1616}
1617
d0cf9c0d
SH		 1618netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1619 struct net_device *dev)
e2ebc74d
JB		 1620{
1621 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a
JB		 1622 struct ieee80211_chanctx_conf *chanctx_conf;
1623 struct ieee80211_channel *chan;
e2ebc74d
JB		 1624 struct ieee80211_radiotap_header *prthdr =
1625 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1627 struct ieee80211_hdr *hdr;
5d9cf4a5 1628 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
9b8a74e3 1629 u16 len_rthdr;
5d9cf4a5 1630 int hdrlen;
e2ebc74d 1631
9b8a74e3
AG		 1632 /* check for not even having the fixed radiotap header part */
1633 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1634 goto fail; /* too short to be possibly valid */
1635
1636 /* is it a header version we can trust to find length from? */
1637 if (unlikely(prthdr->it_version))
1638 goto fail; /* only version 0 is supported */
1639
1640 /* then there must be a radiotap header with a length we can use */
1641 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1642
1643 /* does the skb contain enough to deliver on the alleged length? */
1644 if (unlikely(skb->len < len_rthdr))
1645 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1646
e2ebc74d
JB		 1647 /*
1648 * fix up the pointers accounting for the radiotap
1649 * header still being in there. We are being given
1650 * a precooked IEEE80211 header so no need for
1651 * normal processing
1652 */
9b8a74e3 1653 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1654 /*
9b8a74e3
AG		 1655 * these are just fixed to the end of the rt area since we
1656 * don't have any better information and at this point, nobody cares
e2ebc74d 1657 */
9b8a74e3
AG		 1658 skb_set_network_header(skb, len_rthdr);
1659 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1660
5d9cf4a5
JB		 1661 if (skb->len < len_rthdr + 2)
1662 goto fail;
1663
1664 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1665 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1666
1667 if (skb->len < len_rthdr + hdrlen)
1668 goto fail;
1669
f75f5c6f
HS		 1670 /*
1671 * Initialize skb->protocol if the injected frame is a data frame
1672 * carrying a rfc1042 header
1673 */
5d9cf4a5
JB		 1674 if (ieee80211_is_data(hdr->frame_control) &&
1675 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1676 u8 *payload = (u8 *)hdr + hdrlen;
1677
b203ca39 1678 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1679 skb->protocol = cpu_to_be16((payload[6] << 8) |
1680 payload[7]);
f75f5c6f
HS		 1681 }
1682
3b8d81e0
JB		 1683 memset(info, 0, sizeof(*info));
1684
5d9cf4a5 1685 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1686 IEEE80211_TX_CTL_INJECTED;
1687
1688 /* process and remove the injection radiotap header */
1689 if (!ieee80211_parse_tx_radiotap(skb))
1690 goto fail;
5d9cf4a5
JB		 1691
1692 rcu_read_lock();
1693
1694 /*
1695 * We process outgoing injected frames that have a local address
1696 * we handle as though they are non-injected frames.
1697 * This code here isn't entirely correct, the local MAC address
1698 * isn't always enough to find the interface to use; for proper
1699 * VLAN/WDS support we will need a different mechanism (which
1700 * likely isn't going to be monitor interfaces).
1701 */
1702 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1703
1704 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1705 if (!ieee80211_sdata_running(tmp_sdata))
1706 continue;
1707 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1708 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1709 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1710 continue;
b203ca39 1711 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1712 sdata = tmp_sdata;
1713 break;
1714 }
1715 }
7351c6bd 1716
55de908a
JB		 1717 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1718 if (!chanctx_conf) {
1719 tmp_sdata = rcu_dereference(local->monitor_sdata);
1720 if (tmp_sdata)
1721 chanctx_conf =
1722 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1723 }
55de908a 1724
b4a7ff75
FF		 1725 if (chanctx_conf)
1726 chan = chanctx_conf->def.chan;
1727 else if (!local->use_chanctx)
675a0b04 1728 chan = local->_oper_chandef.chan;
b4a7ff75
FF		 1729 else
1730 goto fail_rcu;
55de908a
JB		 1731
1732 /*
1733 * Frame injection is not allowed if beaconing is not allowed
1734 * or if we need radar detection. Beaconing is usually not allowed when
1735 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1736 * Passive scan is also used in world regulatory domains where
1737 * your country is not known and as such it should be treated as
1738 * NO TX unless the channel is explicitly allowed in which case
1739 * your current regulatory domain would not have the passive scan
1740 * flag.
1741 *
1742 * Since AP mode uses monitor interfaces to inject/TX management
1743 * frames we can make AP mode the exception to this rule once it
1744 * supports radar detection as its implementation can deal with
1745 * radar detection by itself. We can do that later by adding a
1746 * monitor flag interfaces used for AP support.
1747 */
1748 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1749 IEEE80211_CHAN_PASSIVE_SCAN)))
1750 goto fail_rcu;
1751
1752 ieee80211_xmit(sdata, skb, chan->band);
5d9cf4a5
JB		 1753 rcu_read_unlock();
1754
e2ebc74d 1755 return NETDEV_TX_OK;
9b8a74e3 1756
55de908a
JB		 1757fail_rcu:
1758 rcu_read_unlock();
9b8a74e3
AG		 1759fail:
1760 dev_kfree_skb(skb);
1761 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1762}
1763
1764/**
1765 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1766 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1767 * @skb: packet to be sent
1768 * @dev: incoming interface
1769 *
1770 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1771 * not be freed, and caller is responsible for either retrying later or freeing
1772 * skb).
1773 *
1774 * This function takes in an Ethernet header and encapsulates it with suitable
1775 * IEEE 802.11 header based on which interface the packet is coming in. The
1776 * encapsulated packet will then be passed to master interface, wlan#.11, for
1777 * transmission (through low-level driver).
1778 */
d0cf9c0d
SH		 1779netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1780 struct net_device *dev)
e2ebc74d 1781{
133b8226
JB		 1782 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1783 struct ieee80211_local *local = sdata->local;
489ee919 1784 struct ieee80211_tx_info *info;
dcf33963 1785 int head_need;
065e9605
HH		 1786 u16 ethertype, hdrlen, meshhdrlen = 0;
1787 __le16 fc;
e2ebc74d 1788 struct ieee80211_hdr hdr;
ff67bb86 1789 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 1790 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 1791 const u8 *encaps_data;
1792 int encaps_len, skip_header_bytes;
e8bf9649 1793 int nh_pos, h_pos;
f14543ee 1794 struct sta_info *sta = NULL;
c2c98fde 1795 bool wme_sta = false, authorized = false, tdls_auth = false;
941c93cd 1796 bool tdls_direct = false;
a729cff8
JB		 1797 bool multicast;
1798 u32 info_flags = 0;
1799 u16 info_id = 0;
55de908a
JB		 1800 struct ieee80211_chanctx_conf *chanctx_conf;
1801 struct ieee80211_sub_if_data *ap_sdata;
1802 enum ieee80211_band band;
e2ebc74d 1803
dcf33963 1804 if (unlikely(skb->len < ETH_HLEN))
e2ebc74d 1805 goto fail;
e2ebc74d 1806
e2ebc74d
JB		 1807 /* convert Ethernet header to proper 802.11 header (based on
1808 * operation mode) */
1809 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 1810 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 1811
55de908a
JB		 1812 rcu_read_lock();
1813
51fb61e7 1814 switch (sdata->vif.type) {
05c914fe 1815 case NL80211_IFTYPE_AP_VLAN:
9bc383de 1816 sta = rcu_dereference(sdata->u.vlan.sta);
f14543ee
FF		 1817 if (sta) {
1818 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1819 /* RA TA DA SA */
1820 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 1821 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1822 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1823 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1824 hdrlen = 30;
c2c98fde
JB		 1825 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1826 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
f14543ee 1827 }
55de908a
JB		 1828 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1829 u.ap);
1830 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1831 if (!chanctx_conf)
1832 goto fail_rcu;
4bf88530 1833 band = chanctx_conf->def.chan->band;
f14543ee
FF		 1834 if (sta)
1835 break;
1836 /* fall through */
1837 case NL80211_IFTYPE_AP:
fe80123d
AB		 1838 if (sdata->vif.type == NL80211_IFTYPE_AP)
1839 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1840 if (!chanctx_conf)
1841 goto fail_rcu;
065e9605 1842 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 1843 /* DA BSSID SA */
1844 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 1845 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1846 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1847 hdrlen = 24;
4bf88530 1848 band = chanctx_conf->def.chan->band;
cf966838 1849 break;
05c914fe 1850 case NL80211_IFTYPE_WDS:
065e9605 1851 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 1852 /* RA TA DA SA */
1853 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 1854 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1855 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1856 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1857 hdrlen = 30;
55de908a
JB		 1858 /*
1859 * This is the exception! WDS style interfaces are prohibited
1860 * when channel contexts are in used so this must be valid
1861 */
675a0b04 1862 band = local->hw.conf.chandef.chan->band;
cf966838 1863 break;
33b64eb2 1864#ifdef CONFIG_MAC80211_MESH
05c914fe 1865 case NL80211_IFTYPE_MESH_POINT:
472dbc45 1866 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
e32f85f7 1867 /* Do not send frames with mesh_ttl == 0 */
472dbc45 1868 sdata->u.mesh.mshstats.dropped_frames_ttl++;
55de908a 1869 goto fail_rcu;
33b64eb2 1870 }
55de908a 1871
b8bacc18 1872 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 1873 struct sta_info *next_hop;
1874 bool mpp_lookup = true;
1875
bf7cd94d 1876 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 1877 if (mpath) {
1878 mpp_lookup = false;
1879 next_hop = rcu_dereference(mpath->next_hop);
1880 if (!next_hop ||
1881 !(mpath->flags & (MESH_PATH_ACTIVE |
1882 MESH_PATH_RESOLVING)))
1883 mpp_lookup = true;
1884 }
1885
1886 if (mpp_lookup)
bf7cd94d 1887 mppath = mpp_path_lookup(sdata, skb->data);
163df6cf
CYY		 1888
1889 if (mppath && mpath)
1890 mesh_path_del(mpath->sdata, mpath->dst);
b8bacc18 1891 }
79617dee 1892
f76b57b4 1893 /*
9d52501b
JF		 1894 * Use address extension if it is a packet from
1895 * another interface or if we know the destination
1896 * is being proxied by a portal (i.e. portal address
1897 * differs from proxied address)
f76b57b4 1898 */
b203ca39
JP		 1899 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1900 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 1901 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1902 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 1903 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1904 NULL, NULL);
79617dee 1905 } else {
27f01124
TP		 1906 /* DS -> MBSS (802.11-2012 13.11.3.3).
1907 * For unicast with unknown forwarding information,
1908 * destination might be in the MBSS or if that fails
1909 * forwarded to another mesh gate. In either case
1910 * resolution will be handled in ieee80211_xmit(), so
1911 * leave the original DA. This also works for mcast */
1912 const u8 *mesh_da = skb->data;
1913
1914 if (mppath)
1915 mesh_da = mppath->mpp;
1916 else if (mpath)
1917 mesh_da = mpath->dst;
79617dee 1918
3c5772a5 1919 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 1920 mesh_da, sdata->vif.addr);
27f01124
TP		 1921 if (is_multicast_ether_addr(mesh_da))
1922 /* DA TA mSA AE:SA */
bf7cd94d
JB		 1923 meshhdrlen = ieee80211_new_mesh_header(
1924 sdata, &mesh_hdr,
1925 skb->data + ETH_ALEN, NULL);
3c5772a5 1926 else
27f01124 1927 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 1928 meshhdrlen = ieee80211_new_mesh_header(
1929 sdata, &mesh_hdr, skb->data,
1930 skb->data + ETH_ALEN);
79617dee 1931
79617dee 1932 }
55de908a
JB		 1933 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1934 if (!chanctx_conf)
1935 goto fail_rcu;
4bf88530 1936 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 1937 break;
1938#endif
05c914fe 1939 case NL80211_IFTYPE_STATION:
941c93cd 1940 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
c2c98fde
JB		 1941 bool tdls_peer = false;
1942
941c93cd 1943 sta = sta_info_get(sdata, skb->data);
c2c98fde
JB		 1944 if (sta) {
1945 authorized = test_sta_flag(sta,
1946 WLAN_STA_AUTHORIZED);
1947 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1948 tdls_peer = test_sta_flag(sta,
1949 WLAN_STA_TDLS_PEER);
1950 tdls_auth = test_sta_flag(sta,
1951 WLAN_STA_TDLS_PEER_AUTH);
1952 }
941c93cd
AN		 1953
1954 /*
1955 * If the TDLS link is enabled, send everything
1956 * directly. Otherwise, allow TDLS setup frames
1957 * to be transmitted indirectly.
1958 */
c2c98fde 1959 tdls_direct = tdls_peer && (tdls_auth ||
941c93cd
AN		 1960 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1961 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1962 }
1963
1964 if (tdls_direct) {
1965 /* link during setup - throw out frames to peer */
dcf33963 1966 if (!tdls_auth)
55de908a 1967 goto fail_rcu;
941c93cd
AN		 1968
1969 /* DA SA BSSID */
1970 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1971 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1972 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1973 hdrlen = 24;
1974 } else if (sdata->u.mgd.use_4addr &&
1975 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1976 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1977 IEEE80211_FCTL_TODS);
f14543ee 1978 /* RA TA DA SA */
941c93cd 1979 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 1980 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1981 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1982 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1983 hdrlen = 30;
1984 } else {
1985 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1986 /* BSSID SA DA */
941c93cd 1987 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 1988 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1989 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1990 hdrlen = 24;
1991 }
55de908a
JB		 1992 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1993 if (!chanctx_conf)
1994 goto fail_rcu;
4bf88530 1995 band = chanctx_conf->def.chan->band;
cf966838 1996 break;
05c914fe 1997 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 1998 /* DA SA BSSID */
1999 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2000 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 2001 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 2002 hdrlen = 24;
55de908a
JB		 2003 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2004 if (!chanctx_conf)
2005 goto fail_rcu;
4bf88530 2006 band = chanctx_conf->def.chan->band;
cf966838
JB		 2007 break;
2008 default:
55de908a 2009 goto fail_rcu;
e2ebc74d
JB		 2010 }
2011
7d185b8b
JB		 2012 /*
2013 * There's no need to try to look up the destination
2014 * if it is a multicast address (which can only happen
2015 * in AP mode)
2016 */
a729cff8
JB		 2017 multicast = is_multicast_ether_addr(hdr.addr1);
2018 if (!multicast) {
abe60632 2019 sta = sta_info_get(sdata, hdr.addr1);
c2c98fde
JB		 2020 if (sta) {
2021 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2022 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
2023 }
e2ebc74d
JB		 2024 }
2025
4777be41
JC		 2026 /* For mesh, the use of the QoS header is mandatory */
2027 if (ieee80211_vif_is_mesh(&sdata->vif))
c2c98fde 2028 wme_sta = true;
4777be41 2029
3434fbd3 2030 /* receiver and we are QoS enabled, use a QoS type frame */
32c5057b 2031 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
065e9605 2032 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 2033 hdrlen += 2;
2034 }
2035
2036 /*
238814fd
JB		 2037 * Drop unicast frames to unauthorised stations unless they are
2038 * EAPOL frames from the local station.
ce3edf6d 2039 */
55182e4a
JB		 2040 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2041 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
2042 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 2043 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 2044#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 2045 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
e87cc472 2046 dev->name, hdr.addr1);
ce3edf6d
JB		 2047#endif
2048
2049 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2050
55de908a 2051 goto fail_rcu;
ce3edf6d
JB		 2052 }
2053
a729cff8
JB		 2054 if (unlikely(!multicast && skb->sk &&
2055 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2056 struct sk_buff *orig_skb = skb;
2057
2058 skb = skb_clone(skb, GFP_ATOMIC);
2059 if (skb) {
2060 unsigned long flags;
9475af6e 2061 int id;
a729cff8
JB		 2062
2063 spin_lock_irqsave(&local->ack_status_lock, flags);
9475af6e
TH		 2064 id = idr_alloc(&local->ack_status_frames, orig_skb,
2065 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2066 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2067
9475af6e 2068 if (id >= 0) {
a729cff8
JB		 2069 info_id = id;
2070 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2071 } else if (skb_shared(skb)) {
2072 kfree_skb(orig_skb);
2073 } else {
2074 kfree_skb(skb);
2075 skb = orig_skb;
2076 }
2077 } else {
2078 /* couldn't clone -- lose tx status ... */
2079 skb = orig_skb;
2080 }
2081 }
2082
7e244707
HS		 2083 /*
2084 * If the skb is shared we need to obtain our own copy.
2085 */
2086 if (skb_shared(skb)) {
a729cff8
JB		 2087 struct sk_buff *tmp_skb = skb;
2088
2089 /* can't happen -- skb is a clone if info_id != 0 */
2090 WARN_ON(info_id);
2091
f8a0a781 2092 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2093 kfree_skb(tmp_skb);
2094
dcf33963 2095 if (!skb)
55de908a 2096 goto fail_rcu;
7e244707
HS		 2097 }
2098
065e9605 2099 hdr.frame_control = fc;
e2ebc74d
JB		 2100 hdr.duration_id = 0;
2101 hdr.seq_ctrl = 0;
2102
2103 skip_header_bytes = ETH_HLEN;
2104 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2105 encaps_data = bridge_tunnel_header;
2106 encaps_len = sizeof(bridge_tunnel_header);
2107 skip_header_bytes -= 2;
2108 } else if (ethertype >= 0x600) {
2109 encaps_data = rfc1042_header;
2110 encaps_len = sizeof(rfc1042_header);
2111 skip_header_bytes -= 2;
2112 } else {
2113 encaps_data = NULL;
2114 encaps_len = 0;
2115 }
2116
7e244707
HS		 2117 nh_pos = skb_network_header(skb) - skb->data;
2118 h_pos = skb_transport_header(skb) - skb->data;
2119
e2ebc74d
JB		 2120 skb_pull(skb, skip_header_bytes);
2121 nh_pos -= skip_header_bytes;
2122 h_pos -= skip_header_bytes;
2123
23c0752a 2124 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2125
23c0752a
JB		 2126 /*
2127 * So we need to modify the skb header and hence need a copy of
2128 * that. The head_need variable above doesn't, so far, include
2129 * the needed header space that we don't need right away. If we
2130 * can, then we don't reallocate right now but only after the
2131 * frame arrives at the master device (if it does...)
2132 *
2133 * If we cannot, however, then we will reallocate to include all
2134 * the ever needed space. Also, if we need to reallocate it anyway,
2135 * make it big enough for everything we may ever need.
2136 */
e2ebc74d 2137
3a5be7d4 2138 if (head_need > 0 || skb_cloned(skb)) {
23c0752a
JB		 2139 head_need += IEEE80211_ENCRYPT_HEADROOM;
2140 head_need += local->tx_headroom;
2141 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2142 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2143 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2144 skb = NULL;
55de908a 2145 goto fail_rcu;
c3e7724b 2146 }
e2ebc74d
JB		 2147 }
2148
2149 if (encaps_data) {
2150 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2151 nh_pos += encaps_len;
2152 h_pos += encaps_len;
2153 }
c29b9b9b 2154
e4ab7eb0 2155#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2156 if (meshhdrlen > 0) {
2157 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2158 nh_pos += meshhdrlen;
2159 h_pos += meshhdrlen;
2160 }
e4ab7eb0 2161#endif
33b64eb2 2162
065e9605 2163 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2164 __le16 *qos_control;
2165
2166 qos_control = (__le16*) skb_push(skb, 2);
2167 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2168 /*
2169 * Maybe we could actually set some fields here, for now just
2170 * initialise to zero to indicate no special operation.
2171 */
2172 *qos_control = 0;
2173 } else
2174 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2175
e2ebc74d
JB		 2176 nh_pos += hdrlen;
2177 h_pos += hdrlen;
2178
68aae116
SH		 2179 dev->stats.tx_packets++;
2180 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 2181
2182 /* Update skb pointers to various headers since this modified frame
2183 * is going to go through Linux networking code that may potentially
2184 * need things like pointer to IP header. */
2185 skb_set_mac_header(skb, 0);
2186 skb_set_network_header(skb, nh_pos);
2187 skb_set_transport_header(skb, h_pos);
2188
489ee919 2189 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2190 memset(info, 0, sizeof(*info));
2191
e2ebc74d 2192 dev->trans_start = jiffies;
a729cff8
JB		 2193
2194 info->flags = info_flags;
2195 info->ack_frame_id = info_id;
2196
55de908a
JB		 2197 ieee80211_xmit(sdata, skb, band);
2198 rcu_read_unlock();
e2ebc74d 2199
ec634fe3 2200 return NETDEV_TX_OK;
e2ebc74d 2201
55de908a
JB		 2202 fail_rcu:
2203 rcu_read_unlock();
e2ebc74d 2204 fail:
dcf33963
JB		 2205 dev_kfree_skb(skb);
2206 return NETDEV_TX_OK;
e2ebc74d
JB		 2207}
2208
e2ebc74d 2209
e2530083
JB		 2210/*
2211 * ieee80211_clear_tx_pending may not be called in a context where
2212 * it is possible that it packets could come in again.
2213 */
e2ebc74d
JB		 2214void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2215{
1f98ab7f 2216 struct sk_buff *skb;
2de8e0d9 2217 int i;
e2ebc74d 2218
1f98ab7f
FF		 2219 for (i = 0; i < local->hw.queues; i++) {
2220 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2221 ieee80211_free_txskb(&local->hw, skb);
2222 }
e2ebc74d
JB		 2223}
2224
7bb45683
JB		 2225/*
2226 * Returns false if the frame couldn't be transmitted but was queued instead,
2227 * which in this case means re-queued -- take as an indication to stop sending
2228 * more pending frames.
2229 */
cd8ffc80
JB		 2230static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2231 struct sk_buff *skb)
2232{
2233 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2234 struct ieee80211_sub_if_data *sdata;
2235 struct sta_info *sta;
2236 struct ieee80211_hdr *hdr;
7bb45683 2237 bool result;
55de908a 2238 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 2239
5061b0c2 2240 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 2241
2242 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 2243 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2244 if (unlikely(!chanctx_conf)) {
2245 dev_kfree_skb(skb);
2246 return true;
2247 }
2248 result = ieee80211_tx(sdata, skb, true,
4bf88530 2249 chanctx_conf->def.chan->band);
cd8ffc80 2250 } else {
252b86c4
JB		 2251 struct sk_buff_head skbs;
2252
2253 __skb_queue_head_init(&skbs);
2254 __skb_queue_tail(&skbs, skb);
2255
cd8ffc80 2256 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 2257 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 2258
74e4dbfd 2259 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 2260 }
2261
cd8ffc80
JB		 2262 return result;
2263}
2264
e2530083 2265/*
3b8d81e0 2266 * Transmit all pending packets. Called from tasklet.
e2530083 2267 */
e2ebc74d
JB		 2268void ieee80211_tx_pending(unsigned long data)
2269{
2270 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 2271 unsigned long flags;
cd8ffc80 2272 int i;
3b8d81e0 2273 bool txok;
e2ebc74d 2274
f0e72851 2275 rcu_read_lock();
e2530083 2276
3b8d81e0 2277 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 2278 for (i = 0; i < local->hw.queues; i++) {
2279 /*
2280 * If queue is stopped by something other than due to pending
2281 * frames, or we have no pending frames, proceed to next queue.
2282 */
3b8d81e0 2283 if (local->queue_stop_reasons[i] ||
2a577d98 2284 skb_queue_empty(&local->pending[i]))
e2ebc74d 2285 continue;
e2530083 2286
2a577d98 2287 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 2288 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 2289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 2290
a7bc376c 2291 if (WARN_ON(!info->control.vif)) {
c3e7724b 2292 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 2293 continue;
2294 }
2295
3b8d81e0
JB		 2296 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2297 flags);
2298
2299 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 2300 spin_lock_irqsave(&local->queue_stop_reason_lock,
2301 flags);
2302 if (!txok)
2a577d98 2303 break;
e2ebc74d 2304 }
7236fe29
JB		 2305
2306 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 2307 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 2308 }
3b8d81e0 2309 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 2310
f0e72851 2311 rcu_read_unlock();
e2ebc74d
JB		 2312}
2313
2314/* functions for drivers to get certain frames */
2315
eac70c13
MP		 2316static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2317 struct ps_data *ps, struct sk_buff *skb)
e2ebc74d
JB		 2318{
2319 u8 *pos, *tim;
2320 int aid0 = 0;
2321 int i, have_bits = 0, n1, n2;
2322
2323 /* Generate bitmap for TIM only if there are any STAs in power save
2324 * mode. */
d012a605 2325 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 2326 /* in the hope that this is faster than
2327 * checking byte-for-byte */
d012a605 2328 have_bits = !bitmap_empty((unsigned long*)ps->tim,
e2ebc74d
JB		 2329 IEEE80211_MAX_AID+1);
2330
d012a605
MP		 2331 if (ps->dtim_count == 0)
2332 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
e2ebc74d 2333 else
d012a605 2334 ps->dtim_count--;
e2ebc74d
JB		 2335
2336 tim = pos = (u8 *) skb_put(skb, 6);
2337 *pos++ = WLAN_EID_TIM;
2338 *pos++ = 4;
d012a605 2339 *pos++ = ps->dtim_count;
8860020e 2340 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 2341
d012a605 2342 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 2343 aid0 = 1;
2344
d012a605 2345 ps->dtim_bc_mc = aid0 == 1;
512119b3 2346
e2ebc74d
JB		 2347 if (have_bits) {
2348 /* Find largest even number N1 so that bits numbered 1 through
2349 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2350 * (N2 + 1) x 8 through 2007 are 0. */
2351 n1 = 0;
2352 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 2353 if (ps->tim[i]) {
e2ebc74d
JB		 2354 n1 = i & 0xfe;
2355 break;
2356 }
2357 }
2358 n2 = n1;
2359 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 2360 if (ps->tim[i]) {
e2ebc74d
JB		 2361 n2 = i;
2362 break;
2363 }
2364 }
2365
2366 /* Bitmap control */
2367 *pos++ = n1 | aid0;
2368 /* Part Virt Bitmap */
5220da39 2369 skb_put(skb, n2 - n1);
d012a605 2370 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 2371
2372 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 2373 } else {
2374 *pos++ = aid0; /* Bitmap control */
2375 *pos++ = 0; /* Part Virt Bitmap */
2376 }
e2ebc74d
JB		 2377}
2378
eac70c13
MP		 2379static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2380 struct ps_data *ps, struct sk_buff *skb)
2381{
2382 struct ieee80211_local *local = sdata->local;
2383
2384 /*
2385 * Not very nice, but we want to allow the driver to call
2386 * ieee80211_beacon_get() as a response to the set_tim()
2387 * callback. That, however, is already invoked under the
2388 * sta_lock to guarantee consistent and race-free update
2389 * of the tim bitmap in mac80211 and the driver.
2390 */
2391 if (local->tim_in_locked_section) {
2392 __ieee80211_beacon_add_tim(sdata, ps, skb);
2393 } else {
1b91731d 2394 spin_lock_bh(&local->tim_lock);
eac70c13 2395 __ieee80211_beacon_add_tim(sdata, ps, skb);
1b91731d 2396 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 2397 }
2398
2399 return 0;
2400}
2401
eddcbb94
JB		 2402struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2403 struct ieee80211_vif *vif,
2404 u16 *tim_offset, u16 *tim_length)
e2ebc74d
JB		 2405{
2406 struct ieee80211_local *local = hw_to_local(hw);
9d139c81 2407 struct sk_buff *skb = NULL;
e039fa4a 2408 struct ieee80211_tx_info *info;
e2ebc74d 2409 struct ieee80211_sub_if_data *sdata = NULL;
55de908a 2410 enum ieee80211_band band;
e00cfce0 2411 struct ieee80211_tx_rate_control txrc;
55de908a 2412 struct ieee80211_chanctx_conf *chanctx_conf;
8318d78a 2413
5dfdaf58 2414 rcu_read_lock();
e2ebc74d 2415
32bfd35d 2416 sdata = vif_to_sdata(vif);
55de908a 2417 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 2418
55de908a 2419 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 2420 goto out;
2421
eddcbb94
JB		 2422 if (tim_offset)
2423 *tim_offset = 0;
2424 if (tim_length)
2425 *tim_length = 0;
2426
05c914fe 2427 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605
MP		 2428 struct ieee80211_if_ap *ap = &sdata->u.ap;
2429 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2430
3ad97fbc 2431 if (beacon) {
902acc78
JB		 2432 /*
2433 * headroom, head length,
2434 * tail length and maximum TIM length
2435 */
2436 skb = dev_alloc_skb(local->tx_headroom +
2437 beacon->head_len +
2438 beacon->tail_len + 256);
2439 if (!skb)
2440 goto out;
33b64eb2 2441
902acc78
JB		 2442 skb_reserve(skb, local->tx_headroom);
2443 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2444 beacon->head_len);
33b64eb2 2445
eac70c13 2446 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
33b64eb2 2447
eddcbb94
JB		 2448 if (tim_offset)
2449 *tim_offset = beacon->head_len;
2450 if (tim_length)
2451 *tim_length = skb->len - beacon->head_len;
2452
902acc78
JB		 2453 if (beacon->tail)
2454 memcpy(skb_put(skb, beacon->tail_len),
2455 beacon->tail, beacon->tail_len);
9d139c81
JB		 2456 } else
2457 goto out;
05c914fe 2458 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 2459 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 2460 struct ieee80211_hdr *hdr;
c3ffeab4 2461 struct beacon_data *presp = rcu_dereference(ifibss->presp);
33b64eb2 2462
af8cdcd8 2463 if (!presp)
9d139c81
JB		 2464 goto out;
2465
c3ffeab4 2466 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
9d139c81
JB		 2467 if (!skb)
2468 goto out;
c3ffeab4
JB		 2469 skb_reserve(skb, local->tx_headroom);
2470 memcpy(skb_put(skb, presp->head_len), presp->head,
2471 presp->head_len);
9d139c81
JB		 2472
2473 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 2474 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2475 IEEE80211_STYPE_BEACON);
902acc78 2476 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 2477 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2b5e1967 2478 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
472dbc45 2479
2b5e1967 2480 if (!bcn)
ac1bd846 2481 goto out;
ac1bd846 2482
dbf498fb
JC		 2483 if (ifmsh->sync_ops)
2484 ifmsh->sync_ops->adjust_tbtt(
2485 sdata);
2486
3b69a9c5 2487 skb = dev_alloc_skb(local->tx_headroom +
2b5e1967 2488 bcn->head_len +
3f52b7e3 2489 256 + /* TIM IE */
2b5e1967 2490 bcn->tail_len);
902acc78
JB		 2491 if (!skb)
2492 goto out;
2b5e1967
TP		 2493 skb_reserve(skb, local->tx_headroom);
2494 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2495 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2496 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
9d139c81
JB		 2497 } else {
2498 WARN_ON(1);
5dfdaf58 2499 goto out;
e2ebc74d
JB		 2500 }
2501
4bf88530 2502 band = chanctx_conf->def.chan->band;
55de908a 2503
e039fa4a
JB		 2504 info = IEEE80211_SKB_CB(skb);
2505
3b8d81e0 2506 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 2507 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 2508 info->band = band;
e00cfce0
JM		 2509
2510 memset(&txrc, 0, sizeof(txrc));
2511 txrc.hw = hw;
e31583cd 2512 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 2513 txrc.bss_conf = &sdata->vif.bss_conf;
2514 txrc.skb = skb;
2515 txrc.reported_rate.idx = -1;
37eb0b16 2516 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 2517 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 2518 txrc.max_rate_idx = -1;
2519 else
2520 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 2521 txrc.bss = true;
e00cfce0 2522 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 2523
2524 info->control.vif = vif;
f591fa5d 2525
a472e71b
JL		 2526 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2527 IEEE80211_TX_CTL_ASSIGN_SEQ |
2528 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 2529 out:
5dfdaf58 2530 rcu_read_unlock();
e2ebc74d
JB		 2531 return skb;
2532}
eddcbb94 2533EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 2534
02945821
AN		 2535struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2536 struct ieee80211_vif *vif)
2537{
2538 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 2539 struct sk_buff *skb = NULL;
2540 struct probe_resp *presp = NULL;
02945821
AN		 2541 struct ieee80211_hdr *hdr;
2542 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2543
2544 if (sdata->vif.type != NL80211_IFTYPE_AP)
2545 return NULL;
2546
2547 rcu_read_lock();
2548
2549 ap = &sdata->u.ap;
2550 presp = rcu_dereference(ap->probe_resp);
2551 if (!presp)
2552 goto out;
2553
aa7a0080 2554 skb = dev_alloc_skb(presp->len);
02945821
AN		 2555 if (!skb)
2556 goto out;
2557
aa7a0080
ES		 2558 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2559
02945821
AN		 2560 hdr = (struct ieee80211_hdr *) skb->data;
2561 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2562
2563out:
2564 rcu_read_unlock();
2565 return skb;
2566}
2567EXPORT_SYMBOL(ieee80211_proberesp_get);
2568
7044cc56
KV		 2569struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2570 struct ieee80211_vif *vif)
2571{
2572 struct ieee80211_sub_if_data *sdata;
2573 struct ieee80211_if_managed *ifmgd;
2574 struct ieee80211_pspoll *pspoll;
2575 struct ieee80211_local *local;
2576 struct sk_buff *skb;
2577
2578 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2579 return NULL;
2580
2581 sdata = vif_to_sdata(vif);
2582 ifmgd = &sdata->u.mgd;
2583 local = sdata->local;
2584
2585 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 2586 if (!skb)
7044cc56 2587 return NULL;
d15b8459 2588
7044cc56
KV		 2589 skb_reserve(skb, local->hw.extra_tx_headroom);
2590
2591 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2592 memset(pspoll, 0, sizeof(*pspoll));
2593 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2594 IEEE80211_STYPE_PSPOLL);
2595 pspoll->aid = cpu_to_le16(ifmgd->aid);
2596
2597 /* aid in PS-Poll has its two MSBs each set to 1 */
2598 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2599
2600 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2601 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2602
2603 return skb;
2604}
2605EXPORT_SYMBOL(ieee80211_pspoll_get);
2606
2607struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2608 struct ieee80211_vif *vif)
2609{
2610 struct ieee80211_hdr_3addr *nullfunc;
2611 struct ieee80211_sub_if_data *sdata;
2612 struct ieee80211_if_managed *ifmgd;
2613 struct ieee80211_local *local;
2614 struct sk_buff *skb;
2615
2616 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2617 return NULL;
2618
2619 sdata = vif_to_sdata(vif);
2620 ifmgd = &sdata->u.mgd;
2621 local = sdata->local;
2622
2623 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 2624 if (!skb)
7044cc56 2625 return NULL;
d15b8459 2626
7044cc56
KV		 2627 skb_reserve(skb, local->hw.extra_tx_headroom);
2628
2629 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2630 sizeof(*nullfunc));
2631 memset(nullfunc, 0, sizeof(*nullfunc));
2632 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2633 IEEE80211_STYPE_NULLFUNC |
2634 IEEE80211_FCTL_TODS);
2635 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2636 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2637 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2638
2639 return skb;
2640}
2641EXPORT_SYMBOL(ieee80211_nullfunc_get);
2642
05e54ea6
KV		 2643struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2644 struct ieee80211_vif *vif,
2645 const u8 *ssid, size_t ssid_len,
b9a9ada1 2646 size_t tailroom)
05e54ea6
KV		 2647{
2648 struct ieee80211_sub_if_data *sdata;
2649 struct ieee80211_local *local;
2650 struct ieee80211_hdr_3addr *hdr;
2651 struct sk_buff *skb;
2652 size_t ie_ssid_len;
2653 u8 *pos;
2654
2655 sdata = vif_to_sdata(vif);
2656 local = sdata->local;
2657 ie_ssid_len = 2 + ssid_len;
2658
2659 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 2660 ie_ssid_len + tailroom);
d15b8459 2661 if (!skb)
05e54ea6 2662 return NULL;
05e54ea6
KV		 2663
2664 skb_reserve(skb, local->hw.extra_tx_headroom);
2665
2666 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2667 memset(hdr, 0, sizeof(*hdr));
2668 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2669 IEEE80211_STYPE_PROBE_REQ);
e83e6541 2670 eth_broadcast_addr(hdr->addr1);
05e54ea6 2671 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
e83e6541 2672 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 2673
2674 pos = skb_put(skb, ie_ssid_len);
2675 *pos++ = WLAN_EID_SSID;
2676 *pos++ = ssid_len;
88c868c4 2677 if (ssid_len)
05e54ea6
KV		 2678 memcpy(pos, ssid, ssid_len);
2679 pos += ssid_len;
2680
05e54ea6
KV		 2681 return skb;
2682}
2683EXPORT_SYMBOL(ieee80211_probereq_get);
2684
32bfd35d 2685void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2686 const void *frame, size_t frame_len,
e039fa4a 2687 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2688 struct ieee80211_rts *rts)
2689{
2690 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2691
065e9605
HH		 2692 rts->frame_control =
2693 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 2694 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2695 frame_txctl);
e2ebc74d
JB		 2696 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2697 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2698}
2699EXPORT_SYMBOL(ieee80211_rts_get);
2700
32bfd35d 2701void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2702 const void *frame, size_t frame_len,
e039fa4a 2703 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2704 struct ieee80211_cts *cts)
2705{
2706 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2707
065e9605
HH		 2708 cts->frame_control =
2709 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 2710 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2711 frame_len, frame_txctl);
e2ebc74d
JB		 2712 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2713}
2714EXPORT_SYMBOL(ieee80211_ctstoself_get);
2715
2716struct sk_buff *
32bfd35d 2717ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 2718 struct ieee80211_vif *vif)
e2ebc74d
JB		 2719{
2720 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 2721 struct sk_buff *skb = NULL;
5cf121c3 2722 struct ieee80211_tx_data tx;
e2ebc74d 2723 struct ieee80211_sub_if_data *sdata;
d012a605 2724 struct ps_data *ps;
e039fa4a 2725 struct ieee80211_tx_info *info;
55de908a 2726 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 2727
32bfd35d 2728 sdata = vif_to_sdata(vif);
5dfdaf58 2729
5dfdaf58 2730 rcu_read_lock();
55de908a 2731 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 2732
d012a605
MP		 2733 if (!chanctx_conf)
2734 goto out;
2735
2736 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2737 struct beacon_data *beacon =
2738 rcu_dereference(sdata->u.ap.beacon);
2739
2740 if (!beacon || !beacon->head)
2741 goto out;
2742
2743 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 2744 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2745 ps = &sdata->u.mesh.ps;
d012a605 2746 } else {
747cf5e9 2747 goto out;
d012a605 2748 }
5dfdaf58 2749
d012a605 2750 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 2751 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 2752
e2ebc74d 2753 while (1) {
d012a605 2754 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 2755 if (!skb)
747cf5e9 2756 goto out;
e2ebc74d
JB		 2757 local->total_ps_buffered--;
2758
d012a605 2759 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 2760 struct ieee80211_hdr *hdr =
2761 (struct ieee80211_hdr *) skb->data;
2762 /* more buffered multicast/broadcast frames ==> set
2763 * MoreData flag in IEEE 802.11 header to inform PS
2764 * STAs */
2765 hdr->frame_control |=
2766 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2767 }
2768
7cbf9d01
MP		 2769 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2770 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3b8d81e0 2771 if (!ieee80211_tx_prepare(sdata, &tx, skb))
e2ebc74d
JB		 2772 break;
2773 dev_kfree_skb_any(skb);
2774 }
e039fa4a
JB		 2775
2776 info = IEEE80211_SKB_CB(skb);
2777
5cf121c3 2778 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 2779 info->band = chanctx_conf->def.chan->band;
e2ebc74d 2780
97b045d6 2781 if (invoke_tx_handlers(&tx))
e2ebc74d 2782 skb = NULL;
97b045d6 2783 out:
d0709a65 2784 rcu_read_unlock();
e2ebc74d
JB		 2785
2786 return skb;
2787}
2788EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 2789
55de908a
JB		 2790void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2791 struct sk_buff *skb, int tid,
2792 enum ieee80211_band band)
3b8d81e0 2793{
353d09c6 2794 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 2795
3b8d81e0
JB		 2796 skb_set_mac_header(skb, 0);
2797 skb_set_network_header(skb, 0);
2798 skb_set_transport_header(skb, 0);
2799
3a25a8c8 2800 skb_set_queue_mapping(skb, ac);
cf6bb79a 2801 skb->priority = tid;
cf0277e7 2802
89afe614
JB		 2803 skb->dev = sdata->dev;
2804
3d34deb6
JB		 2805 /*
2806 * The other path calling ieee80211_xmit is from the tasklet,
2807 * and while we can handle concurrent transmissions locking
2808 * requirements are that we do not come into tx with bhs on.
2809 */
2810 local_bh_disable();
55de908a 2811 ieee80211_xmit(sdata, skb, band);
3d34deb6 2812 local_bh_enable();
3b8d81e0 2813}
Linux 6.x block layer and io_uring tree(s)