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nl80211: clean up CQM settings code
[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 42{
2103dec1 43 int rate, mrate, erp, dur, i, shift = 0;
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);
2103dec1
SW		 49 struct ieee80211_chanctx_conf *chanctx_conf;
50 u32 rate_flags = 0;
51
52 rcu_read_lock();
53 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
54 if (chanctx_conf) {
55 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
56 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
57 }
58 rcu_read_unlock();
e6a9854b
JB		 59
60 /* assume HW handles this */
0d528d85 61 if (tx->rate.flags & IEEE80211_TX_RC_MCS)
e6a9854b
JB		 62 return 0;
63
64 /* uh huh? */
0d528d85 65 if (WARN_ON_ONCE(tx->rate.idx < 0))
e6a9854b 66 return 0;
e2ebc74d 67
2d56577b 68 sband = local->hw.wiphy->bands[info->band];
0d528d85 69 txrate = &sband->bitrates[tx->rate.idx];
8318d78a 70
e6a9854b 71 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 72
73 /*
74 * data and mgmt (except PS Poll):
75 * - during CFP: 32768
76 * - during contention period:
77 * if addr1 is group address: 0
78 * if more fragments = 0 and addr1 is individual address: time to
79 * transmit one ACK plus SIFS
80 * if more fragments = 1 and addr1 is individual address: time to
81 * transmit next fragment plus 2 x ACK plus 3 x SIFS
82 *
83 * IEEE 802.11, 9.6:
84 * - control response frame (CTS or ACK) shall be transmitted using the
85 * same rate as the immediately previous frame in the frame exchange
86 * sequence, if this rate belongs to the PHY mandatory rates, or else
87 * at the highest possible rate belonging to the PHY rates in the
88 * BSSBasicRateSet
89 */
252b86c4 90 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 91 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 92 /* TODO: These control frames are not currently sent by
ccd7b362 93 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 94 * needs to be updated to support duration field calculation.
95 *
96 * RTS: time needed to transmit pending data/mgmt frame plus
97 * one CTS frame plus one ACK frame plus 3 x SIFS
98 * CTS: duration of immediately previous RTS minus time
99 * required to transmit CTS and its SIFS
100 * ACK: 0 if immediately previous directed data/mgmt had
101 * more=0, with more=1 duration in ACK frame is duration
102 * from previous frame minus time needed to transmit ACK
103 * and its SIFS
104 * PS Poll: BIT(15) | BIT(14) | aid
105 */
106 return 0;
107 }
108
109 /* data/mgmt */
110 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 111 return cpu_to_le16(32768);
e2ebc74d
JB		 112
113 if (group_addr) /* Group address as the destination - no ACK */
114 return 0;
115
116 /* Individual destination address:
117 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
118 * CTS and ACK frames shall be transmitted using the highest rate in
119 * basic rate set that is less than or equal to the rate of the
120 * immediately previous frame and that is using the same modulation
121 * (CCK or OFDM). If no basic rate set matches with these requirements,
122 * the highest mandatory rate of the PHY that is less than or equal to
123 * the rate of the previous frame is used.
124 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
125 */
126 rate = -1;
8318d78a
JB		 127 /* use lowest available if everything fails */
128 mrate = sband->bitrates[0].bitrate;
129 for (i = 0; i < sband->n_bitrates; i++) {
130 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 131
8318d78a
JB		 132 if (r->bitrate > txrate->bitrate)
133 break;
e2ebc74d 134
2103dec1
SW		 135 if ((rate_flags & r->flags) != rate_flags)
136 continue;
137
bda3933a 138 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
2103dec1 139 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
8318d78a
JB		 140
141 switch (sband->band) {
142 case IEEE80211_BAND_2GHZ: {
143 u32 flag;
144 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
145 flag = IEEE80211_RATE_MANDATORY_G;
146 else
147 flag = IEEE80211_RATE_MANDATORY_B;
148 if (r->flags & flag)
149 mrate = r->bitrate;
150 break;
151 }
152 case IEEE80211_BAND_5GHZ:
153 if (r->flags & IEEE80211_RATE_MANDATORY_A)
154 mrate = r->bitrate;
155 break;
3a0c52a6
VK		 156 case IEEE80211_BAND_60GHZ:
157 /* TODO, for now fall through */
8318d78a
JB		 158 case IEEE80211_NUM_BANDS:
159 WARN_ON(1);
160 break;
161 }
e2ebc74d
JB		 162 }
163 if (rate == -1) {
164 /* No matching basic rate found; use highest suitable mandatory
165 * PHY rate */
2103dec1 166 rate = DIV_ROUND_UP(mrate, 1 << shift);
e2ebc74d
JB		 167 }
168
6674f210
SW		 169 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
170 if (ieee80211_is_data_qos(hdr->frame_control) &&
c26a0e10 171 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
6674f210
SW		 172 dur = 0;
173 else
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
4ee73f33 177 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
438b61b7
SW		 178 tx->sdata->vif.bss_conf.use_short_preamble,
179 shift);
e2ebc74d
JB		 180
181 if (next_frag_len) {
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
185 /* next fragment */
4ee73f33 186 dur += ieee80211_frame_duration(sband->band, next_frag_len,
8318d78a 187 txrate->bitrate, erp,
438b61b7
SW		 188 tx->sdata->vif.bss_conf.use_short_preamble,
189 shift);
e2ebc74d
JB		 190 }
191
03f93c3d 192 return cpu_to_le16(dur);
e2ebc74d
JB		 193}
194
e2ebc74d 195/* tx handlers */
5c1b98a5
KV		 196static ieee80211_tx_result debug_noinline
197ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
198{
199 struct ieee80211_local *local = tx->local;
0c74211d 200 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 201
202 /* driver doesn't support power save */
203 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
204 return TX_CONTINUE;
205
206 /* hardware does dynamic power save */
207 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
208 return TX_CONTINUE;
209
210 /* dynamic power save disabled */
211 if (local->hw.conf.dynamic_ps_timeout <= 0)
212 return TX_CONTINUE;
213
214 /* we are scanning, don't enable power save */
215 if (local->scanning)
216 return TX_CONTINUE;
217
218 if (!local->ps_sdata)
219 return TX_CONTINUE;
220
221 /* No point if we're going to suspend */
222 if (local->quiescing)
223 return TX_CONTINUE;
224
0c74211d
KV		 225 /* dynamic ps is supported only in managed mode */
226 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
227 return TX_CONTINUE;
228
229 ifmgd = &tx->sdata->u.mgd;
230
231 /*
232 * Don't wakeup from power save if u-apsd is enabled, voip ac has
233 * u-apsd enabled and the frame is in voip class. This effectively
234 * means that even if all access categories have u-apsd enabled, in
235 * practise u-apsd is only used with the voip ac. This is a
236 * workaround for the case when received voip class packets do not
237 * have correct qos tag for some reason, due the network or the
238 * peer application.
239 *
dc41e4d4 240 * Note: ifmgd->uapsd_queues access is racy here. If the value is
0c74211d
KV		 241 * changed via debugfs, user needs to reassociate manually to have
242 * everything in sync.
243 */
4875d30d
JB		 244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
0c74211d
KV		 247 return TX_CONTINUE;
248
5c1b98a5
KV		 249 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
250 ieee80211_stop_queues_by_reason(&local->hw,
445ea4e8 251 IEEE80211_MAX_QUEUE_MAP,
5c1b98a5 252 IEEE80211_QUEUE_STOP_REASON_PS);
db28569a 253 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 254 ieee80211_queue_work(&local->hw,
255 &local->dynamic_ps_disable_work);
256 }
257
5db1c07c
LC		 258 /* Don't restart the timer if we're not disassociated */
259 if (!ifmgd->associated)
260 return TX_CONTINUE;
261
5c1b98a5
KV		 262 mod_timer(&local->dynamic_ps_timer, jiffies +
263 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
264
265 return TX_CONTINUE;
266}
e2ebc74d 267
d9e8a70f 268static ieee80211_tx_result debug_noinline
5cf121c3 269ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 270{
358c8d9d 271
e039fa4a 272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 274 bool assoc = false;
e2ebc74d 275
e039fa4a 276 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 277 return TX_CONTINUE;
58d4185e 278
b23b025f
BG		 279 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
280 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 281 !ieee80211_is_probe_req(hdr->frame_control) &&
282 !ieee80211_is_nullfunc(hdr->frame_control))
283 /*
284 * When software scanning only nullfunc frames (to notify
285 * the sleep state to the AP) and probe requests (for the
286 * active scan) are allowed, all other frames should not be
287 * sent and we should not get here, but if we do
288 * nonetheless, drop them to avoid sending them
289 * off-channel. See the link below and
290 * ieee80211_start_scan() for more.
291 *
292 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
293 */
9ae54c84 294 return TX_DROP;
e2ebc74d 295
1be7fe8d
BJ		 296 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
297 return TX_CONTINUE;
298
05c914fe 299 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
33b64eb2
LCC		 300 return TX_CONTINUE;
301
5cf121c3 302 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 303 return TX_CONTINUE;
e2ebc74d 304
c2c98fde
JB		 305 if (tx->sta)
306 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 307
5cf121c3 308 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 309 if (unlikely(!assoc &&
358c8d9d 310 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d 311#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0
JB		 312 sdata_info(tx->sdata,
313 "dropped data frame to not associated station %pM\n",
314 hdr->addr1);
315#endif
e2ebc74d 316 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 317 return TX_DROP;
e2ebc74d 318 }
29623892
JB		 319 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
320 ieee80211_is_data(hdr->frame_control) &&
030ef8f8 321 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
29623892
JB		 322 /*
323 * No associated STAs - no need to send multicast
324 * frames.
325 */
326 return TX_DROP;
e2ebc74d
JB		 327 }
328
9ae54c84 329 return TX_CONTINUE;
e2ebc74d
JB		 330}
331
e2ebc74d
JB		 332/* This function is called whenever the AP is about to exceed the maximum limit
333 * of buffered frames for power saving STAs. This situation should not really
334 * happen often during normal operation, so dropping the oldest buffered packet
335 * from each queue should be OK to make some room for new frames. */
336static void purge_old_ps_buffers(struct ieee80211_local *local)
337{
338 int total = 0, purged = 0;
339 struct sk_buff *skb;
340 struct ieee80211_sub_if_data *sdata;
341 struct sta_info *sta;
342
79010420 343 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
d012a605
MP		 344 struct ps_data *ps;
345
346 if (sdata->vif.type == NL80211_IFTYPE_AP)
347 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 348 else if (ieee80211_vif_is_mesh(&sdata->vif))
349 ps = &sdata->u.mesh.ps;
d012a605 350 else
e2ebc74d 351 continue;
d012a605
MP		 352
353 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d
JB		 354 if (skb) {
355 purged++;
356 dev_kfree_skb(skb);
357 }
d012a605 358 total += skb_queue_len(&ps->bc_buf);
e2ebc74d 359 }
e2ebc74d 360
948d887d
JB		 361 /*
362 * Drop one frame from each station from the lowest-priority
363 * AC that has frames at all.
364 */
d0709a65 365 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 366 int ac;
367
368 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
369 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
370 total += skb_queue_len(&sta->ps_tx_buf[ac]);
371 if (skb) {
372 purged++;
c3e7724b 373 ieee80211_free_txskb(&local->hw, skb);
948d887d
JB		 374 break;
375 }
e2ebc74d 376 }
e2ebc74d 377 }
d0709a65 378
e2ebc74d 379 local->total_ps_buffered = total;
bdcbd8e0 380 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
e2ebc74d
JB		 381}
382
9ae54c84 383static ieee80211_tx_result
5cf121c3 384ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 385{
e039fa4a 386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 387 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d012a605 388 struct ps_data *ps;
e039fa4a 389
7d54d0dd
JB		 390 /*
391 * broadcast/multicast frame
392 *
3f52b7e3 393 * If any of the associated/peer stations is in power save mode,
7d54d0dd
JB		 394 * the frame is buffered to be sent after DTIM beacon frame.
395 * This is done either by the hardware or us.
396 */
397
3f52b7e3 398 /* powersaving STAs currently only in AP/VLAN/mesh mode */
d012a605
MP		 399 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
400 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
401 if (!tx->sdata->bss)
402 return TX_CONTINUE;
403
404 ps = &tx->sdata->bss->ps;
3f52b7e3
MP		 405 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
406 ps = &tx->sdata->u.mesh.ps;
d012a605 407 } else {
3e122be0 408 return TX_CONTINUE;
d012a605
MP		 409 }
410
3e122be0
JB		 411
412 /* no buffering for ordered frames */
358c8d9d 413 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 414 return TX_CONTINUE;
7d54d0dd 415
f4d57941
JB		 416 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
417 info->hw_queue = tx->sdata->vif.cab_queue;
418
7d54d0dd 419 /* no stations in PS mode */
d012a605 420 if (!atomic_read(&ps->num_sta_ps))
9ae54c84 421 return TX_CONTINUE;
7d54d0dd 422
62b517cb 423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
62b1208e 424
62b517cb
JB		 425 /* device releases frame after DTIM beacon */
426 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
62b1208e 427 return TX_CONTINUE;
62b1208e 428
7d54d0dd 429 /* buffered in mac80211 */
62b1208e
JB		 430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
431 purge_old_ps_buffers(tx->local);
432
d012a605 433 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
bdcbd8e0
JB		 434 ps_dbg(tx->sdata,
435 "BC TX buffer full - dropping the oldest frame\n");
d012a605 436 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
62b1208e
JB		 437 } else
438 tx->local->total_ps_buffered++;
e2ebc74d 439
d012a605 440 skb_queue_tail(&ps->bc_buf, tx->skb);
7d54d0dd 441
62b1208e 442 return TX_QUEUED;
e2ebc74d
JB		 443}
444
fb733336
JM		 445static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
446 struct sk_buff *skb)
447{
448 if (!ieee80211_is_mgmt(fc))
449 return 0;
450
c2c98fde 451 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 452 return 0;
453
454 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
455 skb->data))
456 return 0;
457
458 return 1;
459}
460
9ae54c84 461static ieee80211_tx_result
5cf121c3 462ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 463{
464 struct sta_info *sta = tx->sta;
e039fa4a 465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 467 struct ieee80211_local *local = tx->local;
e2ebc74d 468
02f2f1a9 469 if (unlikely(!sta))
9ae54c84 470 return TX_CONTINUE;
e2ebc74d 471
c2c98fde
JB		 472 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
473 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
02f2f1a9 474 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
948d887d
JB		 475 int ac = skb_get_queue_mapping(tx->skb);
476
02f2f1a9
JB		 477 /* only deauth, disassoc and action are bufferable MMPDUs */
478 if (ieee80211_is_mgmt(hdr->frame_control) &&
479 !ieee80211_is_deauth(hdr->frame_control) &&
480 !ieee80211_is_disassoc(hdr->frame_control) &&
481 !ieee80211_is_action(hdr->frame_control)) {
482 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
483 return TX_CONTINUE;
484 }
485
bdcbd8e0
JB		 486 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
487 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d
JB		 488 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
489 purge_old_ps_buffers(tx->local);
948d887d
JB		 490 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
491 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
bdcbd8e0
JB		 492 ps_dbg(tx->sdata,
493 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
494 sta->sta.addr, ac);
c3e7724b 495 ieee80211_free_txskb(&local->hw, old);
e2ebc74d
JB		 496 } else
497 tx->local->total_ps_buffered++;
004c872e 498
e039fa4a 499 info->control.jiffies = jiffies;
5061b0c2 500 info->control.vif = &tx->sdata->vif;
8f77f384 501 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
948d887d 502 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
3393a608
JO		 503
504 if (!timer_pending(&local->sta_cleanup))
505 mod_timer(&local->sta_cleanup,
506 round_jiffies(jiffies +
507 STA_INFO_CLEANUP_INTERVAL));
508
c868cb35
JB		 509 /*
510 * We queued up some frames, so the TIM bit might
511 * need to be set, recalculate it.
512 */
513 sta_info_recalc_tim(sta);
514
9ae54c84 515 return TX_QUEUED;
bdcbd8e0
JB		 516 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
517 ps_dbg(tx->sdata,
518 "STA %pM in PS mode, but polling/in SP -> send frame\n",
519 sta->sta.addr);
e2ebc74d 520 }
e2ebc74d 521
9ae54c84 522 return TX_CONTINUE;
e2ebc74d
JB		 523}
524
d9e8a70f 525static ieee80211_tx_result debug_noinline
5cf121c3 526ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 527{
5cf121c3 528 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 529 return TX_CONTINUE;
e2ebc74d 530
5cf121c3 531 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 532 return ieee80211_tx_h_unicast_ps_buf(tx);
533 else
534 return ieee80211_tx_h_multicast_ps_buf(tx);
535}
536
a621fa4d
JB		 537static ieee80211_tx_result debug_noinline
538ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
539{
540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
541
542 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
543 tx->sdata->control_port_no_encrypt))
544 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
545
546 return TX_CONTINUE;
547}
548
d9e8a70f 549static ieee80211_tx_result debug_noinline
5cf121c3 550ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 551{
46e6de15 552 struct ieee80211_key *key;
e039fa4a 553 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 554 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 555
3b8d81e0 556 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 557 tx->key = NULL;
e31b8213 558 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
d4e46a3d 559 tx->key = key;
3cfcf6ac 560 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324
JM		 561 is_multicast_ether_addr(hdr->addr1) &&
562 ieee80211_is_robust_mgmt_frame(hdr) &&
3cfcf6ac
JM		 563 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
564 tx->key = key;
f7e0104c
JB		 565 else if (is_multicast_ether_addr(hdr->addr1) &&
566 (key = rcu_dereference(tx->sdata->default_multicast_key)))
567 tx->key = key;
568 else if (!is_multicast_ether_addr(hdr->addr1) &&
569 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 570 tx->key = key;
46e6de15
JB		 571 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
572 tx->key = NULL;
573 else if (!tx->sdata->drop_unencrypted)
574 tx->key = NULL;
575 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
576 tx->key = NULL;
577 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
578 !(ieee80211_is_action(hdr->frame_control) &&
579 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
580 tx->key = NULL;
4922f71f
NC		 581 else if (ieee80211_is_mgmt(hdr->frame_control) &&
582 !ieee80211_is_robust_mgmt_frame(hdr))
583 tx->key = NULL;
46e6de15 584 else {
e2ebc74d 585 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
9ae54c84 586 return TX_DROP;
46e6de15 587 }
e2ebc74d
JB		 588
589 if (tx->key) {
813d7669
JB		 590 bool skip_hw = false;
591
e2ebc74d 592 tx->key->tx_rx_count++;
011bfcc4 593 /* TODO: add threshold stuff again */
176e4f84 594
97359d12
JB		 595 switch (tx->key->conf.cipher) {
596 case WLAN_CIPHER_SUITE_WEP40:
597 case WLAN_CIPHER_SUITE_WEP104:
97359d12 598 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 599 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 600 tx->key = NULL;
601 break;
97359d12 602 case WLAN_CIPHER_SUITE_CCMP:
fb733336
JM		 603 if (!ieee80211_is_data_present(hdr->frame_control) &&
604 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
605 tx->skb))
606 tx->key = NULL;
3b43a187
KV		 607 else
608 skip_hw = (tx->key->conf.flags &
e548c49e 609 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 610 ieee80211_is_mgmt(hdr->frame_control);
fb733336 611 break;
97359d12 612 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 613 if (!ieee80211_is_mgmt(hdr->frame_control))
614 tx->key = NULL;
615 break;
176e4f84 616 }
813d7669 617
e54faf29
JB		 618 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
619 !ieee80211_is_deauth(hdr->frame_control)))
95acac61
JB		 620 return TX_DROP;
621
f12553eb 622 if (!skip_hw && tx->key &&
382b1655 623 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 624 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 625 }
626
9ae54c84 627 return TX_CONTINUE;
e2ebc74d
JB		 628}
629
d9e8a70f 630static ieee80211_tx_result debug_noinline
5cf121c3 631ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 632{
e039fa4a 633 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 634 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
635 struct ieee80211_supported_band *sband;
a2c40249 636 u32 len;
e6a9854b 637 struct ieee80211_tx_rate_control txrc;
0d528d85 638 struct ieee80211_sta_rates *ratetbl = NULL;
c2c98fde 639 bool assoc = false;
8318d78a 640
e6a9854b 641 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 642
2d56577b 643 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 644
a2c40249 645 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 646 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 647
648 /* set up the tx rate control struct we give the RC algo */
005e472b 649 txrc.hw = &tx->local->hw;
e6a9854b
JB		 650 txrc.sband = sband;
651 txrc.bss_conf = &tx->sdata->vif.bss_conf;
652 txrc.skb = tx->skb;
653 txrc.reported_rate.idx = -1;
2d56577b 654 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
37eb0b16
JM		 655 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
656 txrc.max_rate_idx = -1;
657 else
658 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2ffbe6d3
FF		 659
660 if (tx->sdata->rc_has_mcs_mask[info->band])
661 txrc.rate_idx_mcs_mask =
662 tx->sdata->rc_rateidx_mcs_mask[info->band];
663
8f0729b1 664 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 665 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
8f0729b1 666 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
e6a9854b
JB		 667
668 /* set up RTS protection if desired */
b9a5f8ca 669 if (len > tx->local->hw.wiphy->rts_threshold) {
0d528d85 670 txrc.rts = true;
e2ebc74d 671 }
e2ebc74d 672
0d528d85 673 info->control.use_rts = txrc.rts;
991fec09
FF		 674 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
675
e6a9854b
JB		 676 /*
677 * Use short preamble if the BSS can handle it, but not for
678 * management frames unless we know the receiver can handle
679 * that -- the management frame might be to a station that
680 * just wants a probe response.
681 */
682 if (tx->sdata->vif.bss_conf.use_short_preamble &&
683 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 684 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
0d528d85
FF		 685 txrc.short_preamble = true;
686
687 info->control.short_preamble = txrc.short_preamble;
e2ebc74d 688
c2c98fde
JB		 689 if (tx->sta)
690 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 691
692 /*
693 * Lets not bother rate control if we're associated and cannot
694 * talk to the sta. This should not happen.
695 */
c2c98fde 696 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 697 !rate_usable_index_exists(sband, &tx->sta->sta),
698 "%s: Dropped data frame as no usable bitrate found while "
699 "scanning and associated. Target station: "
700 "%pM on %d GHz band\n",
47846c9b 701 tx->sdata->name, hdr->addr1,
2d56577b 702 info->band ? 5 : 2))
b770b43e 703 return TX_DROP;
2e92e6f2 704
b770b43e
LR		 705 /*
706 * If we're associated with the sta at this point we know we can at
707 * least send the frame at the lowest bit rate.
708 */
e6a9854b
JB		 709 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
710
0d528d85
FF		 711 if (tx->sta && !info->control.skip_table)
712 ratetbl = rcu_dereference(tx->sta->sta.rates);
713
714 if (unlikely(info->control.rates[0].idx < 0)) {
715 if (ratetbl) {
716 struct ieee80211_tx_rate rate = {
717 .idx = ratetbl->rate[0].idx,
718 .flags = ratetbl->rate[0].flags,
719 .count = ratetbl->rate[0].count
720 };
721
722 if (ratetbl->rate[0].idx < 0)
723 return TX_DROP;
724
725 tx->rate = rate;
726 } else {
727 return TX_DROP;
728 }
729 } else {
730 tx->rate = info->control.rates[0];
731 }
e6a9854b 732
c1ce5a74 733 if (txrc.reported_rate.idx < 0) {
0d528d85 734 txrc.reported_rate = tx->rate;
c1ce5a74
HS		 735 if (tx->sta && ieee80211_is_data(hdr->frame_control))
736 tx->sta->last_tx_rate = txrc.reported_rate;
737 } else if (tx->sta)
e6a9854b 738 tx->sta->last_tx_rate = txrc.reported_rate;
e039fa4a 739
0d528d85
FF		 740 if (ratetbl)
741 return TX_CONTINUE;
742
e6a9854b
JB		 743 if (unlikely(!info->control.rates[0].count))
744 info->control.rates[0].count = 1;
e2ebc74d 745
9955151d
GS		 746 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
747 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
748 info->control.rates[0].count = 1;
749
e6a9854b
JB		 750 return TX_CONTINUE;
751}
752
f591fa5d
JB		 753static ieee80211_tx_result debug_noinline
754ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
755{
756 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
757 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
758 u16 *seq;
759 u8 *qc;
760 int tid;
761
25d834e1
JB		 762 /*
763 * Packet injection may want to control the sequence
764 * number, if we have no matching interface then we
765 * neither assign one ourselves nor ask the driver to.
766 */
5061b0c2 767 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 768 return TX_CONTINUE;
769
f591fa5d
JB		 770 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
771 return TX_CONTINUE;
772
773 if (ieee80211_hdrlen(hdr->frame_control) < 24)
774 return TX_CONTINUE;
775
49a59543
JB		 776 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
777 return TX_CONTINUE;
778
94778280
JB		 779 /*
780 * Anything but QoS data that has a sequence number field
781 * (is long enough) gets a sequence number from the global
782 * counter.
783 */
f591fa5d 784 if (!ieee80211_is_data_qos(hdr->frame_control)) {
94778280 785 /* driver should assign sequence number */
f591fa5d 786 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 787 /* for pure STA mode without beacons, we can do it */
788 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
789 tx->sdata->sequence_number += 0x10;
f591fa5d
JB		 790 return TX_CONTINUE;
791 }
792
793 /*
794 * This should be true for injected/management frames only, for
795 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
796 * above since they are not QoS-data frames.
797 */
798 if (!tx->sta)
799 return TX_CONTINUE;
800
801 /* include per-STA, per-TID sequence counter */
802
803 qc = ieee80211_get_qos_ctl(hdr);
804 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
805 seq = &tx->sta->tid_seq[tid];
806
807 hdr->seq_ctrl = cpu_to_le16(*seq);
808
809 /* Increase the sequence number. */
810 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
811
812 return TX_CONTINUE;
813}
814
252b86c4 815static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 816 struct sk_buff *skb, int hdrlen,
817 int frag_threshold)
818{
252b86c4 819 struct ieee80211_local *local = tx->local;
a1a3fcec 820 struct ieee80211_tx_info *info;
252b86c4 821 struct sk_buff *tmp;
2de8e0d9
JB		 822 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
823 int pos = hdrlen + per_fragm;
824 int rem = skb->len - hdrlen - per_fragm;
825
826 if (WARN_ON(rem < 0))
827 return -EINVAL;
828
252b86c4
JB		 829 /* first fragment was already added to queue by caller */
830
2de8e0d9
JB		 831 while (rem) {
832 int fraglen = per_fragm;
833
834 if (fraglen > rem)
835 fraglen = rem;
836 rem -= fraglen;
837 tmp = dev_alloc_skb(local->tx_headroom +
838 frag_threshold +
839 IEEE80211_ENCRYPT_HEADROOM +
840 IEEE80211_ENCRYPT_TAILROOM);
841 if (!tmp)
842 return -ENOMEM;
252b86c4
JB		 843
844 __skb_queue_tail(&tx->skbs, tmp);
845
2de8e0d9
JB		 846 skb_reserve(tmp, local->tx_headroom +
847 IEEE80211_ENCRYPT_HEADROOM);
848 /* copy control information */
849 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 850
851 info = IEEE80211_SKB_CB(tmp);
852 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
853 IEEE80211_TX_CTL_FIRST_FRAGMENT);
854
855 if (rem)
856 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
857
2de8e0d9
JB		 858 skb_copy_queue_mapping(tmp, skb);
859 tmp->priority = skb->priority;
2de8e0d9 860 tmp->dev = skb->dev;
2de8e0d9
JB		 861
862 /* copy header and data */
863 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
864 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
865
866 pos += fraglen;
867 }
868
252b86c4 869 /* adjust first fragment's length */
2de8e0d9
JB		 870 skb->len = hdrlen + per_fragm;
871 return 0;
872}
873
d9e8a70f 874static ieee80211_tx_result debug_noinline
e2454948
JB		 875ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
876{
2de8e0d9
JB		 877 struct sk_buff *skb = tx->skb;
878 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
879 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 880 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 881 int hdrlen;
882 int fragnum;
e2454948 883
252b86c4
JB		 884 /* no matter what happens, tx->skb moves to tx->skbs */
885 __skb_queue_tail(&tx->skbs, skb);
886 tx->skb = NULL;
887
a26eb27a
JB		 888 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
889 return TX_CONTINUE;
890
891 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 892 return TX_CONTINUE;
893
eefce91a
JB		 894 /*
895 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 896 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 897 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 898 */
8b30b1fe 899 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 900 return TX_DROP;
901
065e9605 902 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 903
a26eb27a 904 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 905 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 906 return TX_DROP;
e6a9854b 907
2de8e0d9
JB		 908 /*
909 * Now fragment the frame. This will allocate all the fragments and
910 * chain them (using skb as the first fragment) to skb->next.
911 * During transmission, we will remove the successfully transmitted
912 * fragments from this list. When the low-level driver rejects one
913 * of the fragments then we will simply pretend to accept the skb
914 * but store it away as pending.
915 */
252b86c4 916 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 917 return TX_DROP;
e6a9854b 918
2de8e0d9
JB		 919 /* update duration/seq/flags of fragments */
920 fragnum = 0;
252b86c4
JB		 921
922 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 923 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 924
2de8e0d9
JB		 925 hdr = (void *)skb->data;
926 info = IEEE80211_SKB_CB(skb);
e6a9854b 927
252b86c4 928 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 929 hdr->frame_control |= morefrags;
e6a9854b
JB		 930 /*
931 * No multi-rate retries for fragmented frames, that
932 * would completely throw off the NAV at other STAs.
933 */
934 info->control.rates[1].idx = -1;
935 info->control.rates[2].idx = -1;
936 info->control.rates[3].idx = -1;
e3e1a0bc 937 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 938 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 939 } else {
940 hdr->frame_control &= ~morefrags;
e6a9854b 941 }
2de8e0d9
JB		 942 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
943 fragnum++;
252b86c4 944 }
e2ebc74d 945
9ae54c84 946 return TX_CONTINUE;
e2ebc74d
JB		 947}
948
feff1f2f
JB		 949static ieee80211_tx_result debug_noinline
950ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
951{
252b86c4 952 struct sk_buff *skb;
560d2682 953 int ac = -1;
feff1f2f
JB		 954
955 if (!tx->sta)
956 return TX_CONTINUE;
957
252b86c4 958 skb_queue_walk(&tx->skbs, skb) {
560d2682 959 ac = skb_get_queue_mapping(skb);
feff1f2f 960 tx->sta->tx_fragments++;
560d2682 961 tx->sta->tx_bytes[ac] += skb->len;
252b86c4 962 }
560d2682
JB		 963 if (ac >= 0)
964 tx->sta->tx_packets[ac]++;
feff1f2f
JB		 965
966 return TX_CONTINUE;
967}
968
d9e8a70f 969static ieee80211_tx_result debug_noinline
e2454948
JB		 970ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
971{
972 if (!tx->key)
973 return TX_CONTINUE;
974
97359d12
JB		 975 switch (tx->key->conf.cipher) {
976 case WLAN_CIPHER_SUITE_WEP40:
977 case WLAN_CIPHER_SUITE_WEP104:
e2454948 978 return ieee80211_crypto_wep_encrypt(tx);
97359d12 979 case WLAN_CIPHER_SUITE_TKIP:
e2454948 980 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 981 case WLAN_CIPHER_SUITE_CCMP:
e2454948 982 return ieee80211_crypto_ccmp_encrypt(tx);
97359d12 983 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 984 return ieee80211_crypto_aes_cmac_encrypt(tx);
3ffc2a90 985 default:
d32a1028 986 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 987 }
988
e2454948
JB		 989 return TX_DROP;
990}
991
d9e8a70f 992static ieee80211_tx_result debug_noinline
03f93c3d
JB		 993ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
994{
252b86c4 995 struct sk_buff *skb;
2de8e0d9
JB		 996 struct ieee80211_hdr *hdr;
997 int next_len;
998 bool group_addr;
03f93c3d 999
252b86c4 1000 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1001 hdr = (void *) skb->data;
7e0aae47
JM		 1002 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1003 break; /* must not overwrite AID */
252b86c4
JB		 1004 if (!skb_queue_is_last(&tx->skbs, skb)) {
1005 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1006 next_len = next->len;
1007 } else
1008 next_len = 0;
2de8e0d9 1009 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1010
2de8e0d9 1011 hdr->duration_id =
252b86c4
JB		 1012 ieee80211_duration(tx, skb, group_addr, next_len);
1013 }
03f93c3d
JB		 1014
1015 return TX_CONTINUE;
1016}
1017
e2ebc74d
JB		 1018/* actual transmit path */
1019
a622ab72
JB		 1020static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1021 struct sk_buff *skb,
1022 struct ieee80211_tx_info *info,
1023 struct tid_ampdu_tx *tid_tx,
1024 int tid)
1025{
1026 bool queued = false;
285fa695 1027 bool reset_agg_timer = false;
aa454580 1028 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1029
1030 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1031 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1032 reset_agg_timer = true;
0ab33703
JB		 1033 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1034 /*
1035 * nothing -- this aggregation session is being started
1036 * but that might still fail with the driver
1037 */
a622ab72
JB		 1038 } else {
1039 spin_lock(&tx->sta->lock);
1040 /*
1041 * Need to re-check now, because we may get here
1042 *
1043 * 1) in the window during which the setup is actually
1044 * already done, but not marked yet because not all
1045 * packets are spliced over to the driver pending
1046 * queue yet -- if this happened we acquire the lock
1047 * either before or after the splice happens, but
1048 * need to recheck which of these cases happened.
1049 *
1050 * 2) during session teardown, if the OPERATIONAL bit
1051 * was cleared due to the teardown but the pointer
1052 * hasn't been assigned NULL yet (or we loaded it
1053 * before it was assigned) -- in this case it may
1054 * now be NULL which means we should just let the
1055 * packet pass through because splicing the frames
1056 * back is already done.
1057 */
40b275b6 1058 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1059
1060 if (!tid_tx) {
1061 /* do nothing, let packet pass through */
1062 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1063 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1064 reset_agg_timer = true;
a622ab72
JB		 1065 } else {
1066 queued = true;
1067 info->control.vif = &tx->sdata->vif;
1068 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1069 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1070 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1071 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1072 }
1073 spin_unlock(&tx->sta->lock);
aa454580
HS		 1074
1075 if (purge_skb)
c3e7724b 1076 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1077 }
1078
285fa695
NM		 1079 /* reset session timer */
1080 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1081 tid_tx->last_tx = jiffies;
285fa695 1082
a622ab72
JB		 1083 return queued;
1084}
1085
58d4185e
JB		 1086/*
1087 * initialises @tx
1088 */
9ae54c84 1089static ieee80211_tx_result
3b8d81e0
JB		 1090ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1091 struct ieee80211_tx_data *tx,
1092 struct sk_buff *skb)
e2ebc74d 1093{
3b8d81e0 1094 struct ieee80211_local *local = sdata->local;
58d4185e 1095 struct ieee80211_hdr *hdr;
e039fa4a 1096 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1097 int tid;
a622ab72 1098 u8 *qc;
e2ebc74d
JB		 1099
1100 memset(tx, 0, sizeof(*tx));
1101 tx->skb = skb;
e2ebc74d 1102 tx->local = local;
3b8d81e0 1103 tx->sdata = sdata;
252b86c4 1104 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1105
cd8ffc80
JB		 1106 /*
1107 * If this flag is set to true anywhere, and we get here,
1108 * we are doing the needed processing, so remove the flag
1109 * now.
1110 */
1111 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1112
58d4185e
JB		 1113 hdr = (struct ieee80211_hdr *) skb->data;
1114
3f0e0b22 1115 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
f14543ee 1116 tx->sta = rcu_dereference(sdata->u.vlan.sta);
3f0e0b22
FF		 1117 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1118 return TX_DROP;
66f2c99a
FF		 1119 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1120 tx->sdata->control_port_protocol == tx->skb->protocol) {
b4d57adb 1121 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
3f0e0b22 1122 }
f14543ee 1123 if (!tx->sta)
abe60632 1124 tx->sta = sta_info_get(sdata, hdr->addr1);
58d4185e 1125
cd8ffc80 1126 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1127 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
edf6b784
AN		 1128 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1129 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1130 struct tid_ampdu_tx *tid_tx;
1131
8b30b1fe
S		 1132 qc = ieee80211_get_qos_ctl(hdr);
1133 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1134
a622ab72
JB		 1135 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1136 if (tid_tx) {
1137 bool queued;
cd8ffc80 1138
a622ab72
JB		 1139 queued = ieee80211_tx_prep_agg(tx, skb, info,
1140 tid_tx, tid);
1141
1142 if (unlikely(queued))
1143 return TX_QUEUED;
1144 }
8b30b1fe
S		 1145 }
1146
badffb72 1147 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1148 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1149 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1150 } else
5cf121c3 1151 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1152
a26eb27a
JB		 1153 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1154 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1155 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1156 info->flags & IEEE80211_TX_CTL_AMPDU)
1157 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1158 }
1159
e2ebc74d 1160 if (!tx->sta)
e039fa4a 1161 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
c2c98fde 1162 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
e039fa4a 1163 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
58d4185e 1164
e039fa4a 1165 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1166
9ae54c84 1167 return TX_CONTINUE;
e2ebc74d
JB		 1168}
1169
11127e91
JB		 1170static bool ieee80211_tx_frags(struct ieee80211_local *local,
1171 struct ieee80211_vif *vif,
1172 struct ieee80211_sta *sta,
1173 struct sk_buff_head *skbs,
1174 bool txpending)
e2ebc74d 1175{
36323f81 1176 struct ieee80211_tx_control control;
252b86c4 1177 struct sk_buff *skb, *tmp;
3b8d81e0 1178 unsigned long flags;
e2ebc74d 1179
252b86c4 1180 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1182 int q = info->hw_queue;
1183
1184#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1185 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1186 __skb_unlink(skb, skbs);
c3e7724b 1187 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1188 continue;
1189 }
1190#endif
3b8d81e0
JB		 1191
1192 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1193 if (local->queue_stop_reasons[q] ||
7bb45683 1194 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1195 if (unlikely(info->flags &
a7679ed5
SF		 1196 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1197 if (local->queue_stop_reasons[q] &
1198 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1199 /*
1200 * Drop off-channel frames if queues
1201 * are stopped for any reason other
1202 * than off-channel operation. Never
1203 * queue them.
1204 */
1205 spin_unlock_irqrestore(
1206 &local->queue_stop_reason_lock,
1207 flags);
1208 ieee80211_purge_tx_queue(&local->hw,
1209 skbs);
1210 return true;
1211 }
1212 } else {
1213
6c17b77b 1214 /*
a7679ed5
SF		 1215 * Since queue is stopped, queue up frames for
1216 * later transmission from the tx-pending
1217 * tasklet when the queue is woken again.
6c17b77b 1218 */
a7679ed5
SF		 1219 if (txpending)
1220 skb_queue_splice_init(skbs,
1221 &local->pending[q]);
1222 else
1223 skb_queue_splice_tail_init(skbs,
1224 &local->pending[q]);
1225
1226 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1227 flags);
1228 return false;
6c17b77b 1229 }
7bb45683 1230 }
3b8d81e0 1231 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1232
11127e91 1233 info->control.vif = vif;
36323f81 1234 control.sta = sta;
f0e72851 1235
11127e91 1236 __skb_unlink(skb, skbs);
36323f81 1237 drv_tx(local, &control, skb);
11127e91 1238 }
5061b0c2 1239
11127e91
JB		 1240 return true;
1241}
1242
1243/*
1244 * Returns false if the frame couldn't be transmitted but was queued instead.
1245 */
1246static bool __ieee80211_tx(struct ieee80211_local *local,
1247 struct sk_buff_head *skbs, int led_len,
1248 struct sta_info *sta, bool txpending)
1249{
1250 struct ieee80211_tx_info *info;
1251 struct ieee80211_sub_if_data *sdata;
1252 struct ieee80211_vif *vif;
1253 struct ieee80211_sta *pubsta;
1254 struct sk_buff *skb;
1255 bool result = true;
1256 __le16 fc;
5061b0c2 1257
11127e91
JB		 1258 if (WARN_ON(skb_queue_empty(skbs)))
1259 return true;
ec25acc4 1260
11127e91
JB		 1261 skb = skb_peek(skbs);
1262 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1263 info = IEEE80211_SKB_CB(skb);
1264 sdata = vif_to_sdata(info->control.vif);
1265 if (sta && !sta->uploaded)
1266 sta = NULL;
1267
1268 if (sta)
1269 pubsta = &sta->sta;
1270 else
1271 pubsta = NULL;
1272
1273 switch (sdata->vif.type) {
1274 case NL80211_IFTYPE_MONITOR:
c82b5a74
JB		 1275 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1276 vif = &sdata->vif;
1277 break;
1278 }
4b6f1dd6 1279 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1280 if (sdata) {
4b6f1dd6 1281 vif = &sdata->vif;
3a25a8c8
JB		 1282 info->hw_queue =
1283 vif->hw_queue[skb_get_queue_mapping(skb)];
1284 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1285 dev_kfree_skb(skb);
1286 return true;
1287 } else
4b6f1dd6 1288 vif = NULL;
11127e91
JB		 1289 break;
1290 case NL80211_IFTYPE_AP_VLAN:
1291 sdata = container_of(sdata->bss,
1292 struct ieee80211_sub_if_data, u.ap);
1293 /* fall through */
1294 default:
1295 vif = &sdata->vif;
1296 break;
e2ebc74d 1297 }
2de8e0d9 1298
cb831b53
JB		 1299 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1300 txpending);
11127e91 1301
74e4dbfd 1302 ieee80211_tpt_led_trig_tx(local, fc, led_len);
74e4dbfd 1303
4db4e0a1 1304 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1305
11127e91 1306 return result;
e2ebc74d
JB		 1307}
1308
97b045d6
JB		 1309/*
1310 * Invoke TX handlers, return 0 on success and non-zero if the
1311 * frame was dropped or queued.
1312 */
1313static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1314{
252b86c4 1315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1316 ieee80211_tx_result res = TX_DROP;
97b045d6 1317
9aa4aee3
JB		 1318#define CALL_TXH(txh) \
1319 do { \
1320 res = txh(tx); \
1321 if (res != TX_CONTINUE) \
1322 goto txh_done; \
1323 } while (0)
1324
5c1b98a5 1325 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1326 CALL_TXH(ieee80211_tx_h_check_assoc);
1327 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1328 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1329 CALL_TXH(ieee80211_tx_h_select_key);
af65cd96
JB		 1330 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1331 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1332
aa5b5492
JB		 1333 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1334 __skb_queue_tail(&tx->skbs, tx->skb);
1335 tx->skb = NULL;
c6fcf6bc 1336 goto txh_done;
aa5b5492 1337 }
c6fcf6bc
JB		 1338
1339 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1340 CALL_TXH(ieee80211_tx_h_sequence);
1341 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1342 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1343 CALL_TXH(ieee80211_tx_h_stats);
1344 CALL_TXH(ieee80211_tx_h_encrypt);
8fd369ee
AN		 1345 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1346 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1347#undef CALL_TXH
97b045d6 1348
d9e8a70f 1349 txh_done:
97b045d6 1350 if (unlikely(res == TX_DROP)) {
5479d0e7 1351 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1352 if (tx->skb)
c3e7724b 1353 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1354 else
1f98ab7f 1355 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1356 return -1;
1357 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1358 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1359 return -1;
1360 }
1361
1362 return 0;
1363}
1364
7bb45683
JB		 1365/*
1366 * Returns false if the frame couldn't be transmitted but was queued instead.
1367 */
1368static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
55de908a
JB		 1369 struct sk_buff *skb, bool txpending,
1370 enum ieee80211_band band)
e2ebc74d 1371{
3b8d81e0 1372 struct ieee80211_local *local = sdata->local;
5cf121c3 1373 struct ieee80211_tx_data tx;
97b045d6 1374 ieee80211_tx_result res_prepare;
e039fa4a 1375 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1376 bool result = true;
74e4dbfd 1377 int led_len;
e2ebc74d 1378
e2ebc74d
JB		 1379 if (unlikely(skb->len < 10)) {
1380 dev_kfree_skb(skb);
7bb45683 1381 return true;
e2ebc74d
JB		 1382 }
1383
58d4185e 1384 /* initialises tx */
74e4dbfd 1385 led_len = skb->len;
3b8d81e0 1386 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
e2ebc74d 1387
cd8ffc80 1388 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1389 ieee80211_free_txskb(&local->hw, skb);
55de908a 1390 return true;
cd8ffc80 1391 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1392 return true;
e2ebc74d
JB		 1393 }
1394
55de908a 1395 info->band = band;
e2ebc74d 1396
3a25a8c8
JB		 1397 /* set up hw_queue value early */
1398 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1399 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1400 info->hw_queue =
1401 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1402
7bb45683 1403 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1404 result = __ieee80211_tx(local, &tx.skbs, led_len,
1405 tx.sta, txpending);
55de908a 1406
7bb45683 1407 return result;
e2ebc74d
JB		 1408}
1409
1410/* device xmit handlers */
1411
3bff1865 1412static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1413 struct sk_buff *skb,
1414 int head_need, bool may_encrypt)
1415{
3bff1865 1416 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1417 int tail_need = 0;
1418
3bff1865 1419 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1420 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1421 tail_need -= skb_tailroom(skb);
1422 tail_need = max_t(int, tail_need, 0);
1423 }
1424
fc7c976d 1425 if (skb_cloned(skb))
23c0752a 1426 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1427 else if (head_need || tail_need)
23c0752a 1428 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1429 else
1430 return 0;
23c0752a
JB		 1431
1432 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1433 wiphy_debug(local->hw.wiphy,
1434 "failed to reallocate TX buffer\n");
23c0752a
JB		 1435 return -ENOMEM;
1436 }
1437
23c0752a
JB		 1438 return 0;
1439}
1440
55de908a
JB		 1441void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1442 enum ieee80211_band band)
e2ebc74d 1443{
3b8d81e0 1444 struct ieee80211_local *local = sdata->local;
e039fa4a 1445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1447 int headroom;
23c0752a 1448 bool may_encrypt;
e2ebc74d 1449
3b8d81e0 1450 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1451
3b8d81e0 1452 headroom = local->tx_headroom;
23c0752a
JB		 1453 if (may_encrypt)
1454 headroom += IEEE80211_ENCRYPT_HEADROOM;
1455 headroom -= skb_headroom(skb);
1456 headroom = max_t(int, 0, headroom);
1457
3bff1865 1458 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1459 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1460 return;
e2ebc74d
JB		 1461 }
1462
740c1aa3 1463 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1464 info->control.vif = &sdata->vif;
e2ebc74d 1465
3f52b7e3
MP		 1466 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1467 if (ieee80211_is_data(hdr->frame_control) &&
1468 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1469 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1470 return; /* skb queued: don't free */
1471 } else {
1472 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1473 }
98aed9fd 1474 }
cca89496 1475
2154c81c 1476 ieee80211_set_qos_hdr(sdata, skb);
55de908a 1477 ieee80211_tx(sdata, skb, false, band);
e2ebc74d
JB		 1478}
1479
73b9f03a
JB		 1480static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1481{
1482 struct ieee80211_radiotap_iterator iterator;
1483 struct ieee80211_radiotap_header *rthdr =
1484 (struct ieee80211_radiotap_header *) skb->data;
1485 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1486 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1487 NULL);
1488 u16 txflags;
1489
1490 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1491 IEEE80211_TX_CTL_DONTFRAG;
1492
1493 /*
1494 * for every radiotap entry that is present
1495 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1496 * entries present, or -EINVAL on error)
1497 */
1498
1499 while (!ret) {
1500 ret = ieee80211_radiotap_iterator_next(&iterator);
1501
1502 if (ret)
1503 continue;
1504
1505 /* see if this argument is something we can use */
1506 switch (iterator.this_arg_index) {
1507 /*
1508 * You must take care when dereferencing iterator.this_arg
1509 * for multibyte types... the pointer is not aligned. Use
1510 * get_unaligned((type *)iterator.this_arg) to dereference
1511 * iterator.this_arg for type "type" safely on all arches.
1512 */
1513 case IEEE80211_RADIOTAP_FLAGS:
1514 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1515 /*
1516 * this indicates that the skb we have been
1517 * handed has the 32-bit FCS CRC at the end...
1518 * we should react to that by snipping it off
1519 * because it will be recomputed and added
1520 * on transmission
1521 */
1522 if (skb->len < (iterator._max_length + FCS_LEN))
1523 return false;
1524
1525 skb_trim(skb, skb->len - FCS_LEN);
1526 }
1527 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1528 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1529 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1530 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1531 break;
1532
1533 case IEEE80211_RADIOTAP_TX_FLAGS:
1534 txflags = get_unaligned_le16(iterator.this_arg);
1535 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1536 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1537 break;
1538
1539 /*
1540 * Please update the file
1541 * Documentation/networking/mac80211-injection.txt
1542 * when parsing new fields here.
1543 */
1544
1545 default:
1546 break;
1547 }
1548 }
1549
1550 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1551 return false;
1552
1553 /*
1554 * remove the radiotap header
1555 * iterator->_max_length was sanity-checked against
1556 * skb->len by iterator init
1557 */
1558 skb_pull(skb, iterator._max_length);
1559
1560 return true;
1561}
1562
d0cf9c0d
SH		 1563netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1564 struct net_device *dev)
e2ebc74d
JB		 1565{
1566 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a
JB		 1567 struct ieee80211_chanctx_conf *chanctx_conf;
1568 struct ieee80211_channel *chan;
e2ebc74d
JB		 1569 struct ieee80211_radiotap_header *prthdr =
1570 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1572 struct ieee80211_hdr *hdr;
5d9cf4a5 1573 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
9b8a74e3 1574 u16 len_rthdr;
5d9cf4a5 1575 int hdrlen;
e2ebc74d 1576
9b8a74e3
AG		 1577 /* check for not even having the fixed radiotap header part */
1578 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1579 goto fail; /* too short to be possibly valid */
1580
1581 /* is it a header version we can trust to find length from? */
1582 if (unlikely(prthdr->it_version))
1583 goto fail; /* only version 0 is supported */
1584
1585 /* then there must be a radiotap header with a length we can use */
1586 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1587
1588 /* does the skb contain enough to deliver on the alleged length? */
1589 if (unlikely(skb->len < len_rthdr))
1590 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1591
e2ebc74d
JB		 1592 /*
1593 * fix up the pointers accounting for the radiotap
1594 * header still being in there. We are being given
1595 * a precooked IEEE80211 header so no need for
1596 * normal processing
1597 */
9b8a74e3 1598 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1599 /*
9b8a74e3
AG		 1600 * these are just fixed to the end of the rt area since we
1601 * don't have any better information and at this point, nobody cares
e2ebc74d 1602 */
9b8a74e3
AG		 1603 skb_set_network_header(skb, len_rthdr);
1604 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1605
5d9cf4a5
JB		 1606 if (skb->len < len_rthdr + 2)
1607 goto fail;
1608
1609 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1610 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1611
1612 if (skb->len < len_rthdr + hdrlen)
1613 goto fail;
1614
f75f5c6f
HS		 1615 /*
1616 * Initialize skb->protocol if the injected frame is a data frame
1617 * carrying a rfc1042 header
1618 */
5d9cf4a5
JB		 1619 if (ieee80211_is_data(hdr->frame_control) &&
1620 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1621 u8 *payload = (u8 *)hdr + hdrlen;
1622
b203ca39 1623 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1624 skb->protocol = cpu_to_be16((payload[6] << 8) |
1625 payload[7]);
f75f5c6f
HS		 1626 }
1627
3b8d81e0
JB		 1628 memset(info, 0, sizeof(*info));
1629
5d9cf4a5 1630 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1631 IEEE80211_TX_CTL_INJECTED;
1632
1633 /* process and remove the injection radiotap header */
1634 if (!ieee80211_parse_tx_radiotap(skb))
1635 goto fail;
5d9cf4a5
JB		 1636
1637 rcu_read_lock();
1638
1639 /*
1640 * We process outgoing injected frames that have a local address
1641 * we handle as though they are non-injected frames.
1642 * This code here isn't entirely correct, the local MAC address
1643 * isn't always enough to find the interface to use; for proper
1644 * VLAN/WDS support we will need a different mechanism (which
1645 * likely isn't going to be monitor interfaces).
1646 */
1647 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1648
1649 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1650 if (!ieee80211_sdata_running(tmp_sdata))
1651 continue;
1652 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1653 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1654 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1655 continue;
b203ca39 1656 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1657 sdata = tmp_sdata;
1658 break;
1659 }
1660 }
7351c6bd 1661
55de908a
JB		 1662 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1663 if (!chanctx_conf) {
1664 tmp_sdata = rcu_dereference(local->monitor_sdata);
1665 if (tmp_sdata)
1666 chanctx_conf =
1667 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1668 }
55de908a 1669
b4a7ff75
FF		 1670 if (chanctx_conf)
1671 chan = chanctx_conf->def.chan;
1672 else if (!local->use_chanctx)
675a0b04 1673 chan = local->_oper_chandef.chan;
b4a7ff75
FF		 1674 else
1675 goto fail_rcu;
55de908a
JB		 1676
1677 /*
1678 * Frame injection is not allowed if beaconing is not allowed
1679 * or if we need radar detection. Beaconing is usually not allowed when
1680 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1681 * Passive scan is also used in world regulatory domains where
1682 * your country is not known and as such it should be treated as
1683 * NO TX unless the channel is explicitly allowed in which case
1684 * your current regulatory domain would not have the passive scan
1685 * flag.
1686 *
1687 * Since AP mode uses monitor interfaces to inject/TX management
1688 * frames we can make AP mode the exception to this rule once it
1689 * supports radar detection as its implementation can deal with
1690 * radar detection by itself. We can do that later by adding a
1691 * monitor flag interfaces used for AP support.
1692 */
1693 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1694 IEEE80211_CHAN_PASSIVE_SCAN)))
1695 goto fail_rcu;
1696
1697 ieee80211_xmit(sdata, skb, chan->band);
5d9cf4a5
JB		 1698 rcu_read_unlock();
1699
e2ebc74d 1700 return NETDEV_TX_OK;
9b8a74e3 1701
55de908a
JB		 1702fail_rcu:
1703 rcu_read_unlock();
9b8a74e3
AG		 1704fail:
1705 dev_kfree_skb(skb);
1706 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1707}
1708
1709/**
1710 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1711 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1712 * @skb: packet to be sent
1713 * @dev: incoming interface
1714 *
1715 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1716 * not be freed, and caller is responsible for either retrying later or freeing
1717 * skb).
1718 *
1719 * This function takes in an Ethernet header and encapsulates it with suitable
1720 * IEEE 802.11 header based on which interface the packet is coming in. The
1721 * encapsulated packet will then be passed to master interface, wlan#.11, for
1722 * transmission (through low-level driver).
1723 */
d0cf9c0d
SH		 1724netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1725 struct net_device *dev)
e2ebc74d 1726{
133b8226
JB		 1727 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1728 struct ieee80211_local *local = sdata->local;
489ee919 1729 struct ieee80211_tx_info *info;
dcf33963 1730 int head_need;
065e9605
HH		 1731 u16 ethertype, hdrlen, meshhdrlen = 0;
1732 __le16 fc;
e2ebc74d 1733 struct ieee80211_hdr hdr;
ff67bb86 1734 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 1735 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 1736 const u8 *encaps_data;
1737 int encaps_len, skip_header_bytes;
e8bf9649 1738 int nh_pos, h_pos;
f14543ee 1739 struct sta_info *sta = NULL;
c2c98fde 1740 bool wme_sta = false, authorized = false, tdls_auth = false;
941c93cd 1741 bool tdls_direct = false;
a729cff8
JB		 1742 bool multicast;
1743 u32 info_flags = 0;
1744 u16 info_id = 0;
55de908a
JB		 1745 struct ieee80211_chanctx_conf *chanctx_conf;
1746 struct ieee80211_sub_if_data *ap_sdata;
1747 enum ieee80211_band band;
e2ebc74d 1748
dcf33963 1749 if (unlikely(skb->len < ETH_HLEN))
e2ebc74d 1750 goto fail;
e2ebc74d 1751
e2ebc74d
JB		 1752 /* convert Ethernet header to proper 802.11 header (based on
1753 * operation mode) */
1754 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 1755 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 1756
55de908a
JB		 1757 rcu_read_lock();
1758
51fb61e7 1759 switch (sdata->vif.type) {
05c914fe 1760 case NL80211_IFTYPE_AP_VLAN:
9bc383de 1761 sta = rcu_dereference(sdata->u.vlan.sta);
f14543ee
FF		 1762 if (sta) {
1763 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1764 /* RA TA DA SA */
1765 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 1766 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1767 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1768 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1769 hdrlen = 30;
c2c98fde
JB		 1770 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1771 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
f14543ee 1772 }
55de908a
JB		 1773 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1774 u.ap);
1775 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1776 if (!chanctx_conf)
1777 goto fail_rcu;
4bf88530 1778 band = chanctx_conf->def.chan->band;
f14543ee
FF		 1779 if (sta)
1780 break;
1781 /* fall through */
1782 case NL80211_IFTYPE_AP:
fe80123d
AB		 1783 if (sdata->vif.type == NL80211_IFTYPE_AP)
1784 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1785 if (!chanctx_conf)
1786 goto fail_rcu;
065e9605 1787 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 1788 /* DA BSSID SA */
1789 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 1790 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1791 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1792 hdrlen = 24;
4bf88530 1793 band = chanctx_conf->def.chan->band;
cf966838 1794 break;
05c914fe 1795 case NL80211_IFTYPE_WDS:
065e9605 1796 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 1797 /* RA TA DA SA */
1798 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 1799 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1800 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1801 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1802 hdrlen = 30;
55de908a
JB		 1803 /*
1804 * This is the exception! WDS style interfaces are prohibited
1805 * when channel contexts are in used so this must be valid
1806 */
675a0b04 1807 band = local->hw.conf.chandef.chan->band;
cf966838 1808 break;
33b64eb2 1809#ifdef CONFIG_MAC80211_MESH
05c914fe 1810 case NL80211_IFTYPE_MESH_POINT:
b8bacc18 1811 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 1812 struct sta_info *next_hop;
1813 bool mpp_lookup = true;
1814
bf7cd94d 1815 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 1816 if (mpath) {
1817 mpp_lookup = false;
1818 next_hop = rcu_dereference(mpath->next_hop);
1819 if (!next_hop ||
1820 !(mpath->flags & (MESH_PATH_ACTIVE |
1821 MESH_PATH_RESOLVING)))
1822 mpp_lookup = true;
1823 }
1824
1825 if (mpp_lookup)
bf7cd94d 1826 mppath = mpp_path_lookup(sdata, skb->data);
163df6cf
CYY		 1827
1828 if (mppath && mpath)
1829 mesh_path_del(mpath->sdata, mpath->dst);
b8bacc18 1830 }
79617dee 1831
f76b57b4 1832 /*
9d52501b
JF		 1833 * Use address extension if it is a packet from
1834 * another interface or if we know the destination
1835 * is being proxied by a portal (i.e. portal address
1836 * differs from proxied address)
f76b57b4 1837 */
b203ca39
JP		 1838 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1839 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 1840 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1841 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 1842 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1843 NULL, NULL);
79617dee 1844 } else {
27f01124
TP		 1845 /* DS -> MBSS (802.11-2012 13.11.3.3).
1846 * For unicast with unknown forwarding information,
1847 * destination might be in the MBSS or if that fails
1848 * forwarded to another mesh gate. In either case
1849 * resolution will be handled in ieee80211_xmit(), so
1850 * leave the original DA. This also works for mcast */
1851 const u8 *mesh_da = skb->data;
1852
1853 if (mppath)
1854 mesh_da = mppath->mpp;
1855 else if (mpath)
1856 mesh_da = mpath->dst;
79617dee 1857
3c5772a5 1858 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 1859 mesh_da, sdata->vif.addr);
27f01124
TP		 1860 if (is_multicast_ether_addr(mesh_da))
1861 /* DA TA mSA AE:SA */
bf7cd94d
JB		 1862 meshhdrlen = ieee80211_new_mesh_header(
1863 sdata, &mesh_hdr,
1864 skb->data + ETH_ALEN, NULL);
3c5772a5 1865 else
27f01124 1866 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 1867 meshhdrlen = ieee80211_new_mesh_header(
1868 sdata, &mesh_hdr, skb->data,
1869 skb->data + ETH_ALEN);
79617dee 1870
79617dee 1871 }
55de908a
JB		 1872 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1873 if (!chanctx_conf)
1874 goto fail_rcu;
4bf88530 1875 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 1876 break;
1877#endif
05c914fe 1878 case NL80211_IFTYPE_STATION:
941c93cd 1879 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
c2c98fde
JB		 1880 bool tdls_peer = false;
1881
941c93cd 1882 sta = sta_info_get(sdata, skb->data);
c2c98fde
JB		 1883 if (sta) {
1884 authorized = test_sta_flag(sta,
1885 WLAN_STA_AUTHORIZED);
1886 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1887 tdls_peer = test_sta_flag(sta,
1888 WLAN_STA_TDLS_PEER);
1889 tdls_auth = test_sta_flag(sta,
1890 WLAN_STA_TDLS_PEER_AUTH);
1891 }
941c93cd
AN		 1892
1893 /*
1894 * If the TDLS link is enabled, send everything
1895 * directly. Otherwise, allow TDLS setup frames
1896 * to be transmitted indirectly.
1897 */
c2c98fde 1898 tdls_direct = tdls_peer && (tdls_auth ||
941c93cd
AN		 1899 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1900 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1901 }
1902
1903 if (tdls_direct) {
1904 /* link during setup - throw out frames to peer */
dcf33963 1905 if (!tdls_auth)
55de908a 1906 goto fail_rcu;
941c93cd
AN		 1907
1908 /* DA SA BSSID */
1909 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1910 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1911 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1912 hdrlen = 24;
1913 } else if (sdata->u.mgd.use_4addr &&
1914 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1915 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1916 IEEE80211_FCTL_TODS);
f14543ee 1917 /* RA TA DA SA */
941c93cd 1918 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 1919 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1920 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1921 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1922 hdrlen = 30;
1923 } else {
1924 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1925 /* BSSID SA DA */
941c93cd 1926 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 1927 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1928 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1929 hdrlen = 24;
1930 }
55de908a
JB		 1931 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1932 if (!chanctx_conf)
1933 goto fail_rcu;
4bf88530 1934 band = chanctx_conf->def.chan->band;
cf966838 1935 break;
05c914fe 1936 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 1937 /* DA SA BSSID */
1938 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1939 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 1940 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 1941 hdrlen = 24;
55de908a
JB		 1942 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1943 if (!chanctx_conf)
1944 goto fail_rcu;
4bf88530 1945 band = chanctx_conf->def.chan->band;
cf966838
JB		 1946 break;
1947 default:
55de908a 1948 goto fail_rcu;
e2ebc74d
JB		 1949 }
1950
7d185b8b
JB		 1951 /*
1952 * There's no need to try to look up the destination
1953 * if it is a multicast address (which can only happen
1954 * in AP mode)
1955 */
a729cff8
JB		 1956 multicast = is_multicast_ether_addr(hdr.addr1);
1957 if (!multicast) {
abe60632 1958 sta = sta_info_get(sdata, hdr.addr1);
c2c98fde
JB		 1959 if (sta) {
1960 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1961 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1962 }
e2ebc74d
JB		 1963 }
1964
4777be41
JC		 1965 /* For mesh, the use of the QoS header is mandatory */
1966 if (ieee80211_vif_is_mesh(&sdata->vif))
c2c98fde 1967 wme_sta = true;
4777be41 1968
3434fbd3 1969 /* receiver and we are QoS enabled, use a QoS type frame */
32c5057b 1970 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
065e9605 1971 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 1972 hdrlen += 2;
1973 }
1974
1975 /*
238814fd
JB		 1976 * Drop unicast frames to unauthorised stations unless they are
1977 * EAPOL frames from the local station.
ce3edf6d 1978 */
55182e4a
JB		 1979 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1980 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1981 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 1982 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 1983#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 1984 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
e87cc472 1985 dev->name, hdr.addr1);
ce3edf6d
JB		 1986#endif
1987
1988 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1989
55de908a 1990 goto fail_rcu;
ce3edf6d
JB		 1991 }
1992
a729cff8
JB		 1993 if (unlikely(!multicast && skb->sk &&
1994 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1995 struct sk_buff *orig_skb = skb;
1996
1997 skb = skb_clone(skb, GFP_ATOMIC);
1998 if (skb) {
1999 unsigned long flags;
9475af6e 2000 int id;
a729cff8
JB		 2001
2002 spin_lock_irqsave(&local->ack_status_lock, flags);
9475af6e
TH		 2003 id = idr_alloc(&local->ack_status_frames, orig_skb,
2004 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2005 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2006
9475af6e 2007 if (id >= 0) {
a729cff8
JB		 2008 info_id = id;
2009 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2010 } else if (skb_shared(skb)) {
2011 kfree_skb(orig_skb);
2012 } else {
2013 kfree_skb(skb);
2014 skb = orig_skb;
2015 }
2016 } else {
2017 /* couldn't clone -- lose tx status ... */
2018 skb = orig_skb;
2019 }
2020 }
2021
7e244707
HS		 2022 /*
2023 * If the skb is shared we need to obtain our own copy.
2024 */
2025 if (skb_shared(skb)) {
a729cff8
JB		 2026 struct sk_buff *tmp_skb = skb;
2027
2028 /* can't happen -- skb is a clone if info_id != 0 */
2029 WARN_ON(info_id);
2030
f8a0a781 2031 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2032 kfree_skb(tmp_skb);
2033
dcf33963 2034 if (!skb)
55de908a 2035 goto fail_rcu;
7e244707
HS		 2036 }
2037
065e9605 2038 hdr.frame_control = fc;
e2ebc74d
JB		 2039 hdr.duration_id = 0;
2040 hdr.seq_ctrl = 0;
2041
2042 skip_header_bytes = ETH_HLEN;
2043 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2044 encaps_data = bridge_tunnel_header;
2045 encaps_len = sizeof(bridge_tunnel_header);
2046 skip_header_bytes -= 2;
e5c5d22e 2047 } else if (ethertype >= ETH_P_802_3_MIN) {
e2ebc74d
JB		 2048 encaps_data = rfc1042_header;
2049 encaps_len = sizeof(rfc1042_header);
2050 skip_header_bytes -= 2;
2051 } else {
2052 encaps_data = NULL;
2053 encaps_len = 0;
2054 }
2055
7e244707
HS		 2056 nh_pos = skb_network_header(skb) - skb->data;
2057 h_pos = skb_transport_header(skb) - skb->data;
2058
e2ebc74d
JB		 2059 skb_pull(skb, skip_header_bytes);
2060 nh_pos -= skip_header_bytes;
2061 h_pos -= skip_header_bytes;
2062
23c0752a 2063 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2064
23c0752a
JB		 2065 /*
2066 * So we need to modify the skb header and hence need a copy of
2067 * that. The head_need variable above doesn't, so far, include
2068 * the needed header space that we don't need right away. If we
2069 * can, then we don't reallocate right now but only after the
2070 * frame arrives at the master device (if it does...)
2071 *
2072 * If we cannot, however, then we will reallocate to include all
2073 * the ever needed space. Also, if we need to reallocate it anyway,
2074 * make it big enough for everything we may ever need.
2075 */
e2ebc74d 2076
3a5be7d4 2077 if (head_need > 0 || skb_cloned(skb)) {
23c0752a
JB		 2078 head_need += IEEE80211_ENCRYPT_HEADROOM;
2079 head_need += local->tx_headroom;
2080 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2081 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2082 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2083 skb = NULL;
55de908a 2084 goto fail_rcu;
c3e7724b 2085 }
e2ebc74d
JB		 2086 }
2087
2088 if (encaps_data) {
2089 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2090 nh_pos += encaps_len;
2091 h_pos += encaps_len;
2092 }
c29b9b9b 2093
e4ab7eb0 2094#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2095 if (meshhdrlen > 0) {
2096 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2097 nh_pos += meshhdrlen;
2098 h_pos += meshhdrlen;
2099 }
e4ab7eb0 2100#endif
33b64eb2 2101
065e9605 2102 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2103 __le16 *qos_control;
2104
2105 qos_control = (__le16*) skb_push(skb, 2);
2106 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2107 /*
2108 * Maybe we could actually set some fields here, for now just
2109 * initialise to zero to indicate no special operation.
2110 */
2111 *qos_control = 0;
2112 } else
2113 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2114
e2ebc74d
JB		 2115 nh_pos += hdrlen;
2116 h_pos += hdrlen;
2117
68aae116
SH		 2118 dev->stats.tx_packets++;
2119 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 2120
2121 /* Update skb pointers to various headers since this modified frame
2122 * is going to go through Linux networking code that may potentially
2123 * need things like pointer to IP header. */
2124 skb_set_mac_header(skb, 0);
2125 skb_set_network_header(skb, nh_pos);
2126 skb_set_transport_header(skb, h_pos);
2127
489ee919 2128 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2129 memset(info, 0, sizeof(*info));
2130
e2ebc74d 2131 dev->trans_start = jiffies;
a729cff8
JB		 2132
2133 info->flags = info_flags;
2134 info->ack_frame_id = info_id;
2135
55de908a
JB		 2136 ieee80211_xmit(sdata, skb, band);
2137 rcu_read_unlock();
e2ebc74d 2138
ec634fe3 2139 return NETDEV_TX_OK;
e2ebc74d 2140
55de908a
JB		 2141 fail_rcu:
2142 rcu_read_unlock();
e2ebc74d 2143 fail:
dcf33963
JB		 2144 dev_kfree_skb(skb);
2145 return NETDEV_TX_OK;
e2ebc74d
JB		 2146}
2147
e2ebc74d 2148
e2530083
JB		 2149/*
2150 * ieee80211_clear_tx_pending may not be called in a context where
2151 * it is possible that it packets could come in again.
2152 */
e2ebc74d
JB		 2153void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2154{
1f98ab7f 2155 struct sk_buff *skb;
2de8e0d9 2156 int i;
e2ebc74d 2157
1f98ab7f
FF		 2158 for (i = 0; i < local->hw.queues; i++) {
2159 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2160 ieee80211_free_txskb(&local->hw, skb);
2161 }
e2ebc74d
JB		 2162}
2163
7bb45683
JB		 2164/*
2165 * Returns false if the frame couldn't be transmitted but was queued instead,
2166 * which in this case means re-queued -- take as an indication to stop sending
2167 * more pending frames.
2168 */
cd8ffc80
JB		 2169static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2170 struct sk_buff *skb)
2171{
2172 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2173 struct ieee80211_sub_if_data *sdata;
2174 struct sta_info *sta;
2175 struct ieee80211_hdr *hdr;
7bb45683 2176 bool result;
55de908a 2177 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 2178
5061b0c2 2179 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 2180
2181 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 2182 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2183 if (unlikely(!chanctx_conf)) {
2184 dev_kfree_skb(skb);
2185 return true;
2186 }
2187 result = ieee80211_tx(sdata, skb, true,
4bf88530 2188 chanctx_conf->def.chan->band);
cd8ffc80 2189 } else {
252b86c4
JB		 2190 struct sk_buff_head skbs;
2191
2192 __skb_queue_head_init(&skbs);
2193 __skb_queue_tail(&skbs, skb);
2194
cd8ffc80 2195 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 2196 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 2197
74e4dbfd 2198 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 2199 }
2200
cd8ffc80
JB		 2201 return result;
2202}
2203
e2530083 2204/*
3b8d81e0 2205 * Transmit all pending packets. Called from tasklet.
e2530083 2206 */
e2ebc74d
JB		 2207void ieee80211_tx_pending(unsigned long data)
2208{
2209 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 2210 unsigned long flags;
cd8ffc80 2211 int i;
3b8d81e0 2212 bool txok;
e2ebc74d 2213
f0e72851 2214 rcu_read_lock();
e2530083 2215
3b8d81e0 2216 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 2217 for (i = 0; i < local->hw.queues; i++) {
2218 /*
2219 * If queue is stopped by something other than due to pending
2220 * frames, or we have no pending frames, proceed to next queue.
2221 */
3b8d81e0 2222 if (local->queue_stop_reasons[i] ||
2a577d98 2223 skb_queue_empty(&local->pending[i]))
e2ebc74d 2224 continue;
e2530083 2225
2a577d98 2226 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 2227 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 2228 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 2229
a7bc376c 2230 if (WARN_ON(!info->control.vif)) {
c3e7724b 2231 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 2232 continue;
2233 }
2234
3b8d81e0
JB		 2235 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2236 flags);
2237
2238 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 2239 spin_lock_irqsave(&local->queue_stop_reason_lock,
2240 flags);
2241 if (!txok)
2a577d98 2242 break;
e2ebc74d 2243 }
7236fe29
JB		 2244
2245 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 2246 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 2247 }
3b8d81e0 2248 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 2249
f0e72851 2250 rcu_read_unlock();
e2ebc74d
JB		 2251}
2252
2253/* functions for drivers to get certain frames */
2254
eac70c13
MP		 2255static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2256 struct ps_data *ps, struct sk_buff *skb)
e2ebc74d
JB		 2257{
2258 u8 *pos, *tim;
2259 int aid0 = 0;
2260 int i, have_bits = 0, n1, n2;
2261
2262 /* Generate bitmap for TIM only if there are any STAs in power save
2263 * mode. */
d012a605 2264 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 2265 /* in the hope that this is faster than
2266 * checking byte-for-byte */
d012a605 2267 have_bits = !bitmap_empty((unsigned long*)ps->tim,
e2ebc74d
JB		 2268 IEEE80211_MAX_AID+1);
2269
d012a605
MP		 2270 if (ps->dtim_count == 0)
2271 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
e2ebc74d 2272 else
d012a605 2273 ps->dtim_count--;
e2ebc74d
JB		 2274
2275 tim = pos = (u8 *) skb_put(skb, 6);
2276 *pos++ = WLAN_EID_TIM;
2277 *pos++ = 4;
d012a605 2278 *pos++ = ps->dtim_count;
8860020e 2279 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 2280
d012a605 2281 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 2282 aid0 = 1;
2283
d012a605 2284 ps->dtim_bc_mc = aid0 == 1;
512119b3 2285
e2ebc74d
JB		 2286 if (have_bits) {
2287 /* Find largest even number N1 so that bits numbered 1 through
2288 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2289 * (N2 + 1) x 8 through 2007 are 0. */
2290 n1 = 0;
2291 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 2292 if (ps->tim[i]) {
e2ebc74d
JB		 2293 n1 = i & 0xfe;
2294 break;
2295 }
2296 }
2297 n2 = n1;
2298 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 2299 if (ps->tim[i]) {
e2ebc74d
JB		 2300 n2 = i;
2301 break;
2302 }
2303 }
2304
2305 /* Bitmap control */
2306 *pos++ = n1 | aid0;
2307 /* Part Virt Bitmap */
5220da39 2308 skb_put(skb, n2 - n1);
d012a605 2309 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 2310
2311 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 2312 } else {
2313 *pos++ = aid0; /* Bitmap control */
2314 *pos++ = 0; /* Part Virt Bitmap */
2315 }
e2ebc74d
JB		 2316}
2317
eac70c13
MP		 2318static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2319 struct ps_data *ps, struct sk_buff *skb)
2320{
2321 struct ieee80211_local *local = sdata->local;
2322
2323 /*
2324 * Not very nice, but we want to allow the driver to call
2325 * ieee80211_beacon_get() as a response to the set_tim()
2326 * callback. That, however, is already invoked under the
2327 * sta_lock to guarantee consistent and race-free update
2328 * of the tim bitmap in mac80211 and the driver.
2329 */
2330 if (local->tim_in_locked_section) {
2331 __ieee80211_beacon_add_tim(sdata, ps, skb);
2332 } else {
1b91731d 2333 spin_lock_bh(&local->tim_lock);
eac70c13 2334 __ieee80211_beacon_add_tim(sdata, ps, skb);
1b91731d 2335 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 2336 }
2337
2338 return 0;
2339}
2340
73da7d5b
SW		 2341void ieee80211_csa_finish(struct ieee80211_vif *vif)
2342{
2343 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2344
2345 ieee80211_queue_work(&sdata->local->hw,
2346 &sdata->csa_finalize_work);
2347}
2348EXPORT_SYMBOL(ieee80211_csa_finish);
2349
2350static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata,
2351 struct beacon_data *beacon)
2352{
2353 struct probe_resp *resp;
2354 int counter_offset_beacon = sdata->csa_counter_offset_beacon;
2355 int counter_offset_presp = sdata->csa_counter_offset_presp;
2356
2357 /* warn if the driver did not check for/react to csa completeness */
2358 if (WARN_ON(((u8 *)beacon->tail)[counter_offset_beacon] == 0))
2359 return;
2360
2361 ((u8 *)beacon->tail)[counter_offset_beacon]--;
2362
2363 if (sdata->vif.type == NL80211_IFTYPE_AP &&
2364 counter_offset_presp) {
2365 rcu_read_lock();
2366 resp = rcu_dereference(sdata->u.ap.probe_resp);
2367
2368 /* if nl80211 accepted the offset, this should not happen. */
2369 if (WARN_ON(!resp)) {
2370 rcu_read_unlock();
2371 return;
2372 }
2373 resp->data[counter_offset_presp]--;
2374 rcu_read_unlock();
2375 }
2376}
2377
2378bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2379{
2380 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2381 struct beacon_data *beacon = NULL;
2382 u8 *beacon_data;
2383 size_t beacon_data_len;
2384 int counter_beacon = sdata->csa_counter_offset_beacon;
2385 int ret = false;
2386
2387 if (!ieee80211_sdata_running(sdata))
2388 return false;
2389
2390 rcu_read_lock();
2391 if (vif->type == NL80211_IFTYPE_AP) {
2392 struct ieee80211_if_ap *ap = &sdata->u.ap;
2393
2394 beacon = rcu_dereference(ap->beacon);
2395 if (WARN_ON(!beacon || !beacon->tail))
2396 goto out;
2397 beacon_data = beacon->tail;
2398 beacon_data_len = beacon->tail_len;
2399 } else {
2400 WARN_ON(1);
2401 goto out;
2402 }
2403
2404 if (WARN_ON(counter_beacon > beacon_data_len))
2405 goto out;
2406
2407 if (beacon_data[counter_beacon] == 0)
2408 ret = true;
2409 out:
2410 rcu_read_unlock();
2411
2412 return ret;
2413}
2414EXPORT_SYMBOL(ieee80211_csa_is_complete);
2415
eddcbb94
JB		 2416struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2417 struct ieee80211_vif *vif,
2418 u16 *tim_offset, u16 *tim_length)
e2ebc74d
JB		 2419{
2420 struct ieee80211_local *local = hw_to_local(hw);
9d139c81 2421 struct sk_buff *skb = NULL;
e039fa4a 2422 struct ieee80211_tx_info *info;
e2ebc74d 2423 struct ieee80211_sub_if_data *sdata = NULL;
55de908a 2424 enum ieee80211_band band;
e00cfce0 2425 struct ieee80211_tx_rate_control txrc;
55de908a 2426 struct ieee80211_chanctx_conf *chanctx_conf;
8318d78a 2427
5dfdaf58 2428 rcu_read_lock();
e2ebc74d 2429
32bfd35d 2430 sdata = vif_to_sdata(vif);
55de908a 2431 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 2432
55de908a 2433 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 2434 goto out;
2435
eddcbb94
JB		 2436 if (tim_offset)
2437 *tim_offset = 0;
2438 if (tim_length)
2439 *tim_length = 0;
2440
05c914fe 2441 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605
MP		 2442 struct ieee80211_if_ap *ap = &sdata->u.ap;
2443 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2444
3ad97fbc 2445 if (beacon) {
73da7d5b
SW		 2446 if (sdata->vif.csa_active)
2447 ieee80211_update_csa(sdata, beacon);
2448
902acc78
JB		 2449 /*
2450 * headroom, head length,
2451 * tail length and maximum TIM length
2452 */
2453 skb = dev_alloc_skb(local->tx_headroom +
2454 beacon->head_len +
2455 beacon->tail_len + 256);
2456 if (!skb)
2457 goto out;
33b64eb2 2458
902acc78
JB		 2459 skb_reserve(skb, local->tx_headroom);
2460 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2461 beacon->head_len);
33b64eb2 2462
eac70c13 2463 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
33b64eb2 2464
eddcbb94
JB		 2465 if (tim_offset)
2466 *tim_offset = beacon->head_len;
2467 if (tim_length)
2468 *tim_length = skb->len - beacon->head_len;
2469
902acc78
JB		 2470 if (beacon->tail)
2471 memcpy(skb_put(skb, beacon->tail_len),
2472 beacon->tail, beacon->tail_len);
9d139c81
JB		 2473 } else
2474 goto out;
05c914fe 2475 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 2476 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 2477 struct ieee80211_hdr *hdr;
c3ffeab4 2478 struct beacon_data *presp = rcu_dereference(ifibss->presp);
33b64eb2 2479
af8cdcd8 2480 if (!presp)
9d139c81
JB		 2481 goto out;
2482
c3ffeab4 2483 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
9d139c81
JB		 2484 if (!skb)
2485 goto out;
c3ffeab4
JB		 2486 skb_reserve(skb, local->tx_headroom);
2487 memcpy(skb_put(skb, presp->head_len), presp->head,
2488 presp->head_len);
9d139c81
JB		 2489
2490 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 2491 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2492 IEEE80211_STYPE_BEACON);
902acc78 2493 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 2494 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2b5e1967 2495 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
472dbc45 2496
2b5e1967 2497 if (!bcn)
ac1bd846 2498 goto out;
ac1bd846 2499
dbf498fb
JC		 2500 if (ifmsh->sync_ops)
2501 ifmsh->sync_ops->adjust_tbtt(
2502 sdata);
2503
3b69a9c5 2504 skb = dev_alloc_skb(local->tx_headroom +
2b5e1967 2505 bcn->head_len +
3f52b7e3 2506 256 + /* TIM IE */
2b5e1967 2507 bcn->tail_len);
902acc78
JB		 2508 if (!skb)
2509 goto out;
2b5e1967
TP		 2510 skb_reserve(skb, local->tx_headroom);
2511 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2512 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2513 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
9d139c81
JB		 2514 } else {
2515 WARN_ON(1);
5dfdaf58 2516 goto out;
e2ebc74d
JB		 2517 }
2518
4bf88530 2519 band = chanctx_conf->def.chan->band;
55de908a 2520
e039fa4a
JB		 2521 info = IEEE80211_SKB_CB(skb);
2522
3b8d81e0 2523 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 2524 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 2525 info->band = band;
e00cfce0
JM		 2526
2527 memset(&txrc, 0, sizeof(txrc));
2528 txrc.hw = hw;
e31583cd 2529 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 2530 txrc.bss_conf = &sdata->vif.bss_conf;
2531 txrc.skb = skb;
2532 txrc.reported_rate.idx = -1;
37eb0b16 2533 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 2534 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 2535 txrc.max_rate_idx = -1;
2536 else
2537 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 2538 txrc.bss = true;
e00cfce0 2539 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 2540
2541 info->control.vif = vif;
f591fa5d 2542
a472e71b
JL		 2543 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2544 IEEE80211_TX_CTL_ASSIGN_SEQ |
2545 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 2546 out:
5dfdaf58 2547 rcu_read_unlock();
e2ebc74d
JB		 2548 return skb;
2549}
eddcbb94 2550EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 2551
02945821
AN		 2552struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2553 struct ieee80211_vif *vif)
2554{
2555 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 2556 struct sk_buff *skb = NULL;
2557 struct probe_resp *presp = NULL;
02945821
AN		 2558 struct ieee80211_hdr *hdr;
2559 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2560
2561 if (sdata->vif.type != NL80211_IFTYPE_AP)
2562 return NULL;
2563
2564 rcu_read_lock();
2565
2566 ap = &sdata->u.ap;
2567 presp = rcu_dereference(ap->probe_resp);
2568 if (!presp)
2569 goto out;
2570
aa7a0080 2571 skb = dev_alloc_skb(presp->len);
02945821
AN		 2572 if (!skb)
2573 goto out;
2574
aa7a0080
ES		 2575 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2576
02945821
AN		 2577 hdr = (struct ieee80211_hdr *) skb->data;
2578 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2579
2580out:
2581 rcu_read_unlock();
2582 return skb;
2583}
2584EXPORT_SYMBOL(ieee80211_proberesp_get);
2585
7044cc56
KV		 2586struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2587 struct ieee80211_vif *vif)
2588{
2589 struct ieee80211_sub_if_data *sdata;
2590 struct ieee80211_if_managed *ifmgd;
2591 struct ieee80211_pspoll *pspoll;
2592 struct ieee80211_local *local;
2593 struct sk_buff *skb;
2594
2595 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2596 return NULL;
2597
2598 sdata = vif_to_sdata(vif);
2599 ifmgd = &sdata->u.mgd;
2600 local = sdata->local;
2601
2602 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 2603 if (!skb)
7044cc56 2604 return NULL;
d15b8459 2605
7044cc56
KV		 2606 skb_reserve(skb, local->hw.extra_tx_headroom);
2607
2608 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2609 memset(pspoll, 0, sizeof(*pspoll));
2610 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2611 IEEE80211_STYPE_PSPOLL);
2612 pspoll->aid = cpu_to_le16(ifmgd->aid);
2613
2614 /* aid in PS-Poll has its two MSBs each set to 1 */
2615 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2616
2617 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2618 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2619
2620 return skb;
2621}
2622EXPORT_SYMBOL(ieee80211_pspoll_get);
2623
2624struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2625 struct ieee80211_vif *vif)
2626{
2627 struct ieee80211_hdr_3addr *nullfunc;
2628 struct ieee80211_sub_if_data *sdata;
2629 struct ieee80211_if_managed *ifmgd;
2630 struct ieee80211_local *local;
2631 struct sk_buff *skb;
2632
2633 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2634 return NULL;
2635
2636 sdata = vif_to_sdata(vif);
2637 ifmgd = &sdata->u.mgd;
2638 local = sdata->local;
2639
2640 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 2641 if (!skb)
7044cc56 2642 return NULL;
d15b8459 2643
7044cc56
KV		 2644 skb_reserve(skb, local->hw.extra_tx_headroom);
2645
2646 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2647 sizeof(*nullfunc));
2648 memset(nullfunc, 0, sizeof(*nullfunc));
2649 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2650 IEEE80211_STYPE_NULLFUNC |
2651 IEEE80211_FCTL_TODS);
2652 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2653 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2654 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2655
2656 return skb;
2657}
2658EXPORT_SYMBOL(ieee80211_nullfunc_get);
2659
05e54ea6
KV		 2660struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2661 struct ieee80211_vif *vif,
2662 const u8 *ssid, size_t ssid_len,
b9a9ada1 2663 size_t tailroom)
05e54ea6
KV		 2664{
2665 struct ieee80211_sub_if_data *sdata;
2666 struct ieee80211_local *local;
2667 struct ieee80211_hdr_3addr *hdr;
2668 struct sk_buff *skb;
2669 size_t ie_ssid_len;
2670 u8 *pos;
2671
2672 sdata = vif_to_sdata(vif);
2673 local = sdata->local;
2674 ie_ssid_len = 2 + ssid_len;
2675
2676 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 2677 ie_ssid_len + tailroom);
d15b8459 2678 if (!skb)
05e54ea6 2679 return NULL;
05e54ea6
KV		 2680
2681 skb_reserve(skb, local->hw.extra_tx_headroom);
2682
2683 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2684 memset(hdr, 0, sizeof(*hdr));
2685 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2686 IEEE80211_STYPE_PROBE_REQ);
e83e6541 2687 eth_broadcast_addr(hdr->addr1);
05e54ea6 2688 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
e83e6541 2689 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 2690
2691 pos = skb_put(skb, ie_ssid_len);
2692 *pos++ = WLAN_EID_SSID;
2693 *pos++ = ssid_len;
88c868c4 2694 if (ssid_len)
05e54ea6
KV		 2695 memcpy(pos, ssid, ssid_len);
2696 pos += ssid_len;
2697
05e54ea6
KV		 2698 return skb;
2699}
2700EXPORT_SYMBOL(ieee80211_probereq_get);
2701
32bfd35d 2702void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2703 const void *frame, size_t frame_len,
e039fa4a 2704 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2705 struct ieee80211_rts *rts)
2706{
2707 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2708
065e9605
HH		 2709 rts->frame_control =
2710 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 2711 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2712 frame_txctl);
e2ebc74d
JB		 2713 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2714 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2715}
2716EXPORT_SYMBOL(ieee80211_rts_get);
2717
32bfd35d 2718void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2719 const void *frame, size_t frame_len,
e039fa4a 2720 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2721 struct ieee80211_cts *cts)
2722{
2723 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2724
065e9605
HH		 2725 cts->frame_control =
2726 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 2727 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2728 frame_len, frame_txctl);
e2ebc74d
JB		 2729 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2730}
2731EXPORT_SYMBOL(ieee80211_ctstoself_get);
2732
2733struct sk_buff *
32bfd35d 2734ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 2735 struct ieee80211_vif *vif)
e2ebc74d
JB		 2736{
2737 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 2738 struct sk_buff *skb = NULL;
5cf121c3 2739 struct ieee80211_tx_data tx;
e2ebc74d 2740 struct ieee80211_sub_if_data *sdata;
d012a605 2741 struct ps_data *ps;
e039fa4a 2742 struct ieee80211_tx_info *info;
55de908a 2743 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 2744
32bfd35d 2745 sdata = vif_to_sdata(vif);
5dfdaf58 2746
5dfdaf58 2747 rcu_read_lock();
55de908a 2748 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 2749
d012a605
MP		 2750 if (!chanctx_conf)
2751 goto out;
2752
2753 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2754 struct beacon_data *beacon =
2755 rcu_dereference(sdata->u.ap.beacon);
2756
2757 if (!beacon || !beacon->head)
2758 goto out;
2759
2760 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 2761 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2762 ps = &sdata->u.mesh.ps;
d012a605 2763 } else {
747cf5e9 2764 goto out;
d012a605 2765 }
5dfdaf58 2766
d012a605 2767 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 2768 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 2769
e2ebc74d 2770 while (1) {
d012a605 2771 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 2772 if (!skb)
747cf5e9 2773 goto out;
e2ebc74d
JB		 2774 local->total_ps_buffered--;
2775
d012a605 2776 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 2777 struct ieee80211_hdr *hdr =
2778 (struct ieee80211_hdr *) skb->data;
2779 /* more buffered multicast/broadcast frames ==> set
2780 * MoreData flag in IEEE 802.11 header to inform PS
2781 * STAs */
2782 hdr->frame_control |=
2783 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2784 }
2785
7cbf9d01
MP		 2786 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2787 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3b8d81e0 2788 if (!ieee80211_tx_prepare(sdata, &tx, skb))
e2ebc74d
JB		 2789 break;
2790 dev_kfree_skb_any(skb);
2791 }
e039fa4a
JB		 2792
2793 info = IEEE80211_SKB_CB(skb);
2794
5cf121c3 2795 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 2796 info->band = chanctx_conf->def.chan->band;
e2ebc74d 2797
97b045d6 2798 if (invoke_tx_handlers(&tx))
e2ebc74d 2799 skb = NULL;
97b045d6 2800 out:
d0709a65 2801 rcu_read_unlock();
e2ebc74d
JB		 2802
2803 return skb;
2804}
2805EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 2806
55de908a
JB		 2807void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2808 struct sk_buff *skb, int tid,
2809 enum ieee80211_band band)
3b8d81e0 2810{
353d09c6 2811 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 2812
3b8d81e0
JB		 2813 skb_set_mac_header(skb, 0);
2814 skb_set_network_header(skb, 0);
2815 skb_set_transport_header(skb, 0);
2816
3a25a8c8 2817 skb_set_queue_mapping(skb, ac);
cf6bb79a 2818 skb->priority = tid;
cf0277e7 2819
89afe614
JB		 2820 skb->dev = sdata->dev;
2821
3d34deb6
JB		 2822 /*
2823 * The other path calling ieee80211_xmit is from the tasklet,
2824 * and while we can handle concurrent transmissions locking
2825 * requirements are that we do not come into tx with bhs on.
2826 */
2827 local_bh_disable();
55de908a 2828 ieee80211_xmit(sdata, skb, band);
3d34deb6 2829 local_bh_enable();
3b8d81e0 2830}
Linux 6.x block layer and io_uring tree(s)