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{nl,cfg,mac}80211: enable the triggering of CSA frame in mesh
[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
af61a165
JB		 542 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
543 if (tx->sdata->control_port_no_encrypt)
544 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
545 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
546 }
a621fa4d
JB		 547
548 return TX_CONTINUE;
549}
550
d9e8a70f 551static ieee80211_tx_result debug_noinline
5cf121c3 552ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 553{
46e6de15 554 struct ieee80211_key *key;
e039fa4a 555 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 557
3b8d81e0 558 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 559 tx->key = NULL;
e31b8213 560 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
d4e46a3d 561 tx->key = key;
3cfcf6ac 562 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324
JM		 563 is_multicast_ether_addr(hdr->addr1) &&
564 ieee80211_is_robust_mgmt_frame(hdr) &&
3cfcf6ac
JM		 565 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
566 tx->key = key;
f7e0104c
JB		 567 else if (is_multicast_ether_addr(hdr->addr1) &&
568 (key = rcu_dereference(tx->sdata->default_multicast_key)))
569 tx->key = key;
570 else if (!is_multicast_ether_addr(hdr->addr1) &&
571 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 572 tx->key = key;
46e6de15
JB		 573 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
574 tx->key = NULL;
575 else if (!tx->sdata->drop_unencrypted)
576 tx->key = NULL;
577 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
578 tx->key = NULL;
579 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
580 !(ieee80211_is_action(hdr->frame_control) &&
581 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
582 tx->key = NULL;
4922f71f
NC		 583 else if (ieee80211_is_mgmt(hdr->frame_control) &&
584 !ieee80211_is_robust_mgmt_frame(hdr))
585 tx->key = NULL;
46e6de15 586 else {
e2ebc74d 587 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
9ae54c84 588 return TX_DROP;
46e6de15 589 }
e2ebc74d
JB		 590
591 if (tx->key) {
813d7669
JB		 592 bool skip_hw = false;
593
e2ebc74d 594 tx->key->tx_rx_count++;
011bfcc4 595 /* TODO: add threshold stuff again */
176e4f84 596
97359d12
JB		 597 switch (tx->key->conf.cipher) {
598 case WLAN_CIPHER_SUITE_WEP40:
599 case WLAN_CIPHER_SUITE_WEP104:
97359d12 600 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 601 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 602 tx->key = NULL;
603 break;
97359d12 604 case WLAN_CIPHER_SUITE_CCMP:
fb733336
JM		 605 if (!ieee80211_is_data_present(hdr->frame_control) &&
606 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
607 tx->skb))
608 tx->key = NULL;
3b43a187
KV		 609 else
610 skip_hw = (tx->key->conf.flags &
e548c49e 611 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 612 ieee80211_is_mgmt(hdr->frame_control);
fb733336 613 break;
97359d12 614 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 615 if (!ieee80211_is_mgmt(hdr->frame_control))
616 tx->key = NULL;
617 break;
176e4f84 618 }
813d7669 619
e54faf29
JB		 620 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
621 !ieee80211_is_deauth(hdr->frame_control)))
95acac61
JB		 622 return TX_DROP;
623
f12553eb 624 if (!skip_hw && tx->key &&
382b1655 625 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 626 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 627 }
628
9ae54c84 629 return TX_CONTINUE;
e2ebc74d
JB		 630}
631
d9e8a70f 632static ieee80211_tx_result debug_noinline
5cf121c3 633ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 634{
e039fa4a 635 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 636 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
637 struct ieee80211_supported_band *sband;
a2c40249 638 u32 len;
e6a9854b 639 struct ieee80211_tx_rate_control txrc;
0d528d85 640 struct ieee80211_sta_rates *ratetbl = NULL;
c2c98fde 641 bool assoc = false;
8318d78a 642
e6a9854b 643 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 644
2d56577b 645 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 646
a2c40249 647 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 648 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 649
650 /* set up the tx rate control struct we give the RC algo */
005e472b 651 txrc.hw = &tx->local->hw;
e6a9854b
JB		 652 txrc.sband = sband;
653 txrc.bss_conf = &tx->sdata->vif.bss_conf;
654 txrc.skb = tx->skb;
655 txrc.reported_rate.idx = -1;
2d56577b 656 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
37eb0b16
JM		 657 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
658 txrc.max_rate_idx = -1;
659 else
660 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2ffbe6d3
FF		 661
662 if (tx->sdata->rc_has_mcs_mask[info->band])
663 txrc.rate_idx_mcs_mask =
664 tx->sdata->rc_rateidx_mcs_mask[info->band];
665
8f0729b1 666 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 667 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
8f0729b1 668 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
e6a9854b
JB		 669
670 /* set up RTS protection if desired */
b9a5f8ca 671 if (len > tx->local->hw.wiphy->rts_threshold) {
0d528d85 672 txrc.rts = true;
e2ebc74d 673 }
e2ebc74d 674
0d528d85 675 info->control.use_rts = txrc.rts;
991fec09
FF		 676 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
677
e6a9854b
JB		 678 /*
679 * Use short preamble if the BSS can handle it, but not for
680 * management frames unless we know the receiver can handle
681 * that -- the management frame might be to a station that
682 * just wants a probe response.
683 */
684 if (tx->sdata->vif.bss_conf.use_short_preamble &&
685 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 686 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
0d528d85
FF		 687 txrc.short_preamble = true;
688
689 info->control.short_preamble = txrc.short_preamble;
e2ebc74d 690
c2c98fde
JB		 691 if (tx->sta)
692 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 693
694 /*
695 * Lets not bother rate control if we're associated and cannot
696 * talk to the sta. This should not happen.
697 */
c2c98fde 698 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 699 !rate_usable_index_exists(sband, &tx->sta->sta),
700 "%s: Dropped data frame as no usable bitrate found while "
701 "scanning and associated. Target station: "
702 "%pM on %d GHz band\n",
47846c9b 703 tx->sdata->name, hdr->addr1,
2d56577b 704 info->band ? 5 : 2))
b770b43e 705 return TX_DROP;
2e92e6f2 706
b770b43e
LR		 707 /*
708 * If we're associated with the sta at this point we know we can at
709 * least send the frame at the lowest bit rate.
710 */
e6a9854b
JB		 711 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
712
0d528d85
FF		 713 if (tx->sta && !info->control.skip_table)
714 ratetbl = rcu_dereference(tx->sta->sta.rates);
715
716 if (unlikely(info->control.rates[0].idx < 0)) {
717 if (ratetbl) {
718 struct ieee80211_tx_rate rate = {
719 .idx = ratetbl->rate[0].idx,
720 .flags = ratetbl->rate[0].flags,
721 .count = ratetbl->rate[0].count
722 };
723
724 if (ratetbl->rate[0].idx < 0)
725 return TX_DROP;
726
727 tx->rate = rate;
728 } else {
729 return TX_DROP;
730 }
731 } else {
732 tx->rate = info->control.rates[0];
733 }
e6a9854b 734
c1ce5a74 735 if (txrc.reported_rate.idx < 0) {
0d528d85 736 txrc.reported_rate = tx->rate;
c1ce5a74
HS		 737 if (tx->sta && ieee80211_is_data(hdr->frame_control))
738 tx->sta->last_tx_rate = txrc.reported_rate;
739 } else if (tx->sta)
e6a9854b 740 tx->sta->last_tx_rate = txrc.reported_rate;
e039fa4a 741
0d528d85
FF		 742 if (ratetbl)
743 return TX_CONTINUE;
744
e6a9854b
JB		 745 if (unlikely(!info->control.rates[0].count))
746 info->control.rates[0].count = 1;
e2ebc74d 747
9955151d
GS		 748 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
749 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
750 info->control.rates[0].count = 1;
751
e6a9854b
JB		 752 return TX_CONTINUE;
753}
754
f591fa5d
JB		 755static ieee80211_tx_result debug_noinline
756ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
757{
758 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
759 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
760 u16 *seq;
761 u8 *qc;
762 int tid;
763
25d834e1
JB		 764 /*
765 * Packet injection may want to control the sequence
766 * number, if we have no matching interface then we
767 * neither assign one ourselves nor ask the driver to.
768 */
5061b0c2 769 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 770 return TX_CONTINUE;
771
f591fa5d
JB		 772 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
773 return TX_CONTINUE;
774
775 if (ieee80211_hdrlen(hdr->frame_control) < 24)
776 return TX_CONTINUE;
777
49a59543
JB		 778 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
779 return TX_CONTINUE;
780
94778280
JB		 781 /*
782 * Anything but QoS data that has a sequence number field
783 * (is long enough) gets a sequence number from the global
c4c205f3
BC		 784 * counter. QoS data frames with a multicast destination
785 * also use the global counter (802.11-2012 9.3.2.10).
94778280 786 */
c4c205f3
BC		 787 if (!ieee80211_is_data_qos(hdr->frame_control) ||
788 is_multicast_ether_addr(hdr->addr1)) {
94778280 789 /* driver should assign sequence number */
f591fa5d 790 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 791 /* for pure STA mode without beacons, we can do it */
792 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
793 tx->sdata->sequence_number += 0x10;
f591fa5d
JB		 794 return TX_CONTINUE;
795 }
796
797 /*
798 * This should be true for injected/management frames only, for
799 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
800 * above since they are not QoS-data frames.
801 */
802 if (!tx->sta)
803 return TX_CONTINUE;
804
805 /* include per-STA, per-TID sequence counter */
806
807 qc = ieee80211_get_qos_ctl(hdr);
808 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
809 seq = &tx->sta->tid_seq[tid];
810
811 hdr->seq_ctrl = cpu_to_le16(*seq);
812
813 /* Increase the sequence number. */
814 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
815
816 return TX_CONTINUE;
817}
818
252b86c4 819static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 820 struct sk_buff *skb, int hdrlen,
821 int frag_threshold)
822{
252b86c4 823 struct ieee80211_local *local = tx->local;
a1a3fcec 824 struct ieee80211_tx_info *info;
252b86c4 825 struct sk_buff *tmp;
2de8e0d9
JB		 826 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
827 int pos = hdrlen + per_fragm;
828 int rem = skb->len - hdrlen - per_fragm;
829
830 if (WARN_ON(rem < 0))
831 return -EINVAL;
832
252b86c4
JB		 833 /* first fragment was already added to queue by caller */
834
2de8e0d9
JB		 835 while (rem) {
836 int fraglen = per_fragm;
837
838 if (fraglen > rem)
839 fraglen = rem;
840 rem -= fraglen;
841 tmp = dev_alloc_skb(local->tx_headroom +
842 frag_threshold +
843 IEEE80211_ENCRYPT_HEADROOM +
844 IEEE80211_ENCRYPT_TAILROOM);
845 if (!tmp)
846 return -ENOMEM;
252b86c4
JB		 847
848 __skb_queue_tail(&tx->skbs, tmp);
849
2de8e0d9
JB		 850 skb_reserve(tmp, local->tx_headroom +
851 IEEE80211_ENCRYPT_HEADROOM);
852 /* copy control information */
853 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 854
855 info = IEEE80211_SKB_CB(tmp);
856 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
857 IEEE80211_TX_CTL_FIRST_FRAGMENT);
858
859 if (rem)
860 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
861
2de8e0d9
JB		 862 skb_copy_queue_mapping(tmp, skb);
863 tmp->priority = skb->priority;
2de8e0d9 864 tmp->dev = skb->dev;
2de8e0d9
JB		 865
866 /* copy header and data */
867 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
868 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
869
870 pos += fraglen;
871 }
872
252b86c4 873 /* adjust first fragment's length */
2de8e0d9
JB		 874 skb->len = hdrlen + per_fragm;
875 return 0;
876}
877
d9e8a70f 878static ieee80211_tx_result debug_noinline
e2454948
JB		 879ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
880{
2de8e0d9
JB		 881 struct sk_buff *skb = tx->skb;
882 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
883 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 884 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 885 int hdrlen;
886 int fragnum;
e2454948 887
252b86c4
JB		 888 /* no matter what happens, tx->skb moves to tx->skbs */
889 __skb_queue_tail(&tx->skbs, skb);
890 tx->skb = NULL;
891
a26eb27a
JB		 892 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
893 return TX_CONTINUE;
894
895 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 896 return TX_CONTINUE;
897
eefce91a
JB		 898 /*
899 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 900 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 901 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 902 */
8b30b1fe 903 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 904 return TX_DROP;
905
065e9605 906 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 907
a26eb27a 908 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 909 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 910 return TX_DROP;
e6a9854b 911
2de8e0d9
JB		 912 /*
913 * Now fragment the frame. This will allocate all the fragments and
914 * chain them (using skb as the first fragment) to skb->next.
915 * During transmission, we will remove the successfully transmitted
916 * fragments from this list. When the low-level driver rejects one
917 * of the fragments then we will simply pretend to accept the skb
918 * but store it away as pending.
919 */
252b86c4 920 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 921 return TX_DROP;
e6a9854b 922
2de8e0d9
JB		 923 /* update duration/seq/flags of fragments */
924 fragnum = 0;
252b86c4
JB		 925
926 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 927 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 928
2de8e0d9
JB		 929 hdr = (void *)skb->data;
930 info = IEEE80211_SKB_CB(skb);
e6a9854b 931
252b86c4 932 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 933 hdr->frame_control |= morefrags;
e6a9854b
JB		 934 /*
935 * No multi-rate retries for fragmented frames, that
936 * would completely throw off the NAV at other STAs.
937 */
938 info->control.rates[1].idx = -1;
939 info->control.rates[2].idx = -1;
940 info->control.rates[3].idx = -1;
e3e1a0bc 941 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 942 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 943 } else {
944 hdr->frame_control &= ~morefrags;
e6a9854b 945 }
2de8e0d9
JB		 946 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
947 fragnum++;
252b86c4 948 }
e2ebc74d 949
9ae54c84 950 return TX_CONTINUE;
e2ebc74d
JB		 951}
952
feff1f2f
JB		 953static ieee80211_tx_result debug_noinline
954ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
955{
252b86c4 956 struct sk_buff *skb;
560d2682 957 int ac = -1;
feff1f2f
JB		 958
959 if (!tx->sta)
960 return TX_CONTINUE;
961
252b86c4 962 skb_queue_walk(&tx->skbs, skb) {
560d2682 963 ac = skb_get_queue_mapping(skb);
feff1f2f 964 tx->sta->tx_fragments++;
560d2682 965 tx->sta->tx_bytes[ac] += skb->len;
252b86c4 966 }
560d2682
JB		 967 if (ac >= 0)
968 tx->sta->tx_packets[ac]++;
feff1f2f
JB		 969
970 return TX_CONTINUE;
971}
972
d9e8a70f 973static ieee80211_tx_result debug_noinline
e2454948
JB		 974ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
975{
976 if (!tx->key)
977 return TX_CONTINUE;
978
97359d12
JB		 979 switch (tx->key->conf.cipher) {
980 case WLAN_CIPHER_SUITE_WEP40:
981 case WLAN_CIPHER_SUITE_WEP104:
e2454948 982 return ieee80211_crypto_wep_encrypt(tx);
97359d12 983 case WLAN_CIPHER_SUITE_TKIP:
e2454948 984 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 985 case WLAN_CIPHER_SUITE_CCMP:
e2454948 986 return ieee80211_crypto_ccmp_encrypt(tx);
97359d12 987 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 988 return ieee80211_crypto_aes_cmac_encrypt(tx);
3ffc2a90 989 default:
d32a1028 990 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 991 }
992
e2454948
JB		 993 return TX_DROP;
994}
995
d9e8a70f 996static ieee80211_tx_result debug_noinline
03f93c3d
JB		 997ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
998{
252b86c4 999 struct sk_buff *skb;
2de8e0d9
JB		 1000 struct ieee80211_hdr *hdr;
1001 int next_len;
1002 bool group_addr;
03f93c3d 1003
252b86c4 1004 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1005 hdr = (void *) skb->data;
7e0aae47
JM		 1006 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1007 break; /* must not overwrite AID */
252b86c4
JB		 1008 if (!skb_queue_is_last(&tx->skbs, skb)) {
1009 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1010 next_len = next->len;
1011 } else
1012 next_len = 0;
2de8e0d9 1013 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1014
2de8e0d9 1015 hdr->duration_id =
252b86c4
JB		 1016 ieee80211_duration(tx, skb, group_addr, next_len);
1017 }
03f93c3d
JB		 1018
1019 return TX_CONTINUE;
1020}
1021
e2ebc74d
JB		 1022/* actual transmit path */
1023
a622ab72
JB		 1024static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1025 struct sk_buff *skb,
1026 struct ieee80211_tx_info *info,
1027 struct tid_ampdu_tx *tid_tx,
1028 int tid)
1029{
1030 bool queued = false;
285fa695 1031 bool reset_agg_timer = false;
aa454580 1032 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1033
1034 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1035 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1036 reset_agg_timer = true;
0ab33703
JB		 1037 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1038 /*
1039 * nothing -- this aggregation session is being started
1040 * but that might still fail with the driver
1041 */
a622ab72
JB		 1042 } else {
1043 spin_lock(&tx->sta->lock);
1044 /*
1045 * Need to re-check now, because we may get here
1046 *
1047 * 1) in the window during which the setup is actually
1048 * already done, but not marked yet because not all
1049 * packets are spliced over to the driver pending
1050 * queue yet -- if this happened we acquire the lock
1051 * either before or after the splice happens, but
1052 * need to recheck which of these cases happened.
1053 *
1054 * 2) during session teardown, if the OPERATIONAL bit
1055 * was cleared due to the teardown but the pointer
1056 * hasn't been assigned NULL yet (or we loaded it
1057 * before it was assigned) -- in this case it may
1058 * now be NULL which means we should just let the
1059 * packet pass through because splicing the frames
1060 * back is already done.
1061 */
40b275b6 1062 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1063
1064 if (!tid_tx) {
1065 /* do nothing, let packet pass through */
1066 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1067 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1068 reset_agg_timer = true;
a622ab72
JB		 1069 } else {
1070 queued = true;
1071 info->control.vif = &tx->sdata->vif;
1072 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1073 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1074 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1075 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1076 }
1077 spin_unlock(&tx->sta->lock);
aa454580
HS		 1078
1079 if (purge_skb)
c3e7724b 1080 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1081 }
1082
285fa695
NM		 1083 /* reset session timer */
1084 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1085 tid_tx->last_tx = jiffies;
285fa695 1086
a622ab72
JB		 1087 return queued;
1088}
1089
58d4185e
JB		 1090/*
1091 * initialises @tx
1092 */
9ae54c84 1093static ieee80211_tx_result
3b8d81e0
JB		 1094ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1095 struct ieee80211_tx_data *tx,
1096 struct sk_buff *skb)
e2ebc74d 1097{
3b8d81e0 1098 struct ieee80211_local *local = sdata->local;
58d4185e 1099 struct ieee80211_hdr *hdr;
e039fa4a 1100 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1101 int tid;
a622ab72 1102 u8 *qc;
e2ebc74d
JB		 1103
1104 memset(tx, 0, sizeof(*tx));
1105 tx->skb = skb;
e2ebc74d 1106 tx->local = local;
3b8d81e0 1107 tx->sdata = sdata;
252b86c4 1108 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1109
cd8ffc80
JB		 1110 /*
1111 * If this flag is set to true anywhere, and we get here,
1112 * we are doing the needed processing, so remove the flag
1113 * now.
1114 */
1115 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1116
58d4185e
JB		 1117 hdr = (struct ieee80211_hdr *) skb->data;
1118
3f0e0b22 1119 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
f14543ee 1120 tx->sta = rcu_dereference(sdata->u.vlan.sta);
3f0e0b22
FF		 1121 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1122 return TX_DROP;
66f2c99a
FF		 1123 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1124 tx->sdata->control_port_protocol == tx->skb->protocol) {
b4d57adb 1125 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
3f0e0b22 1126 }
f14543ee 1127 if (!tx->sta)
abe60632 1128 tx->sta = sta_info_get(sdata, hdr->addr1);
58d4185e 1129
cd8ffc80 1130 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1131 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
edf6b784
AN		 1132 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1133 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1134 struct tid_ampdu_tx *tid_tx;
1135
8b30b1fe
S		 1136 qc = ieee80211_get_qos_ctl(hdr);
1137 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1138
a622ab72
JB		 1139 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1140 if (tid_tx) {
1141 bool queued;
cd8ffc80 1142
a622ab72
JB		 1143 queued = ieee80211_tx_prep_agg(tx, skb, info,
1144 tid_tx, tid);
1145
1146 if (unlikely(queued))
1147 return TX_QUEUED;
1148 }
8b30b1fe
S		 1149 }
1150
badffb72 1151 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1152 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1153 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1154 } else
5cf121c3 1155 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1156
a26eb27a
JB		 1157 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1158 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1159 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1160 info->flags & IEEE80211_TX_CTL_AMPDU)
1161 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1162 }
1163
e2ebc74d 1164 if (!tx->sta)
e039fa4a 1165 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
c2c98fde 1166 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
e039fa4a 1167 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
58d4185e 1168
e039fa4a 1169 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1170
9ae54c84 1171 return TX_CONTINUE;
e2ebc74d
JB		 1172}
1173
11127e91
JB		 1174static bool ieee80211_tx_frags(struct ieee80211_local *local,
1175 struct ieee80211_vif *vif,
1176 struct ieee80211_sta *sta,
1177 struct sk_buff_head *skbs,
1178 bool txpending)
e2ebc74d 1179{
36323f81 1180 struct ieee80211_tx_control control;
252b86c4 1181 struct sk_buff *skb, *tmp;
3b8d81e0 1182 unsigned long flags;
e2ebc74d 1183
252b86c4 1184 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1185 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1186 int q = info->hw_queue;
1187
1188#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1189 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1190 __skb_unlink(skb, skbs);
c3e7724b 1191 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1192 continue;
1193 }
1194#endif
3b8d81e0
JB		 1195
1196 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1197 if (local->queue_stop_reasons[q] ||
7bb45683 1198 (!txpending && !skb_queue_empty(&local->pending[q]))) {
6c17b77b 1199 if (unlikely(info->flags &
a7679ed5
SF		 1200 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1201 if (local->queue_stop_reasons[q] &
1202 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1203 /*
1204 * Drop off-channel frames if queues
1205 * are stopped for any reason other
1206 * than off-channel operation. Never
1207 * queue them.
1208 */
1209 spin_unlock_irqrestore(
1210 &local->queue_stop_reason_lock,
1211 flags);
1212 ieee80211_purge_tx_queue(&local->hw,
1213 skbs);
1214 return true;
1215 }
1216 } else {
1217
6c17b77b 1218 /*
a7679ed5
SF		 1219 * Since queue is stopped, queue up frames for
1220 * later transmission from the tx-pending
1221 * tasklet when the queue is woken again.
6c17b77b 1222 */
a7679ed5
SF		 1223 if (txpending)
1224 skb_queue_splice_init(skbs,
1225 &local->pending[q]);
1226 else
1227 skb_queue_splice_tail_init(skbs,
1228 &local->pending[q]);
1229
1230 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1231 flags);
1232 return false;
6c17b77b 1233 }
7bb45683 1234 }
3b8d81e0 1235 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1236
11127e91 1237 info->control.vif = vif;
36323f81 1238 control.sta = sta;
f0e72851 1239
11127e91 1240 __skb_unlink(skb, skbs);
36323f81 1241 drv_tx(local, &control, skb);
11127e91 1242 }
5061b0c2 1243
11127e91
JB		 1244 return true;
1245}
1246
1247/*
1248 * Returns false if the frame couldn't be transmitted but was queued instead.
1249 */
1250static bool __ieee80211_tx(struct ieee80211_local *local,
1251 struct sk_buff_head *skbs, int led_len,
1252 struct sta_info *sta, bool txpending)
1253{
1254 struct ieee80211_tx_info *info;
1255 struct ieee80211_sub_if_data *sdata;
1256 struct ieee80211_vif *vif;
1257 struct ieee80211_sta *pubsta;
1258 struct sk_buff *skb;
1259 bool result = true;
1260 __le16 fc;
5061b0c2 1261
11127e91
JB		 1262 if (WARN_ON(skb_queue_empty(skbs)))
1263 return true;
ec25acc4 1264
11127e91
JB		 1265 skb = skb_peek(skbs);
1266 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1267 info = IEEE80211_SKB_CB(skb);
1268 sdata = vif_to_sdata(info->control.vif);
1269 if (sta && !sta->uploaded)
1270 sta = NULL;
1271
1272 if (sta)
1273 pubsta = &sta->sta;
1274 else
1275 pubsta = NULL;
1276
1277 switch (sdata->vif.type) {
1278 case NL80211_IFTYPE_MONITOR:
c82b5a74
JB		 1279 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1280 vif = &sdata->vif;
1281 break;
1282 }
4b6f1dd6 1283 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1284 if (sdata) {
4b6f1dd6 1285 vif = &sdata->vif;
3a25a8c8
JB		 1286 info->hw_queue =
1287 vif->hw_queue[skb_get_queue_mapping(skb)];
1288 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1289 dev_kfree_skb(skb);
1290 return true;
1291 } else
4b6f1dd6 1292 vif = NULL;
11127e91
JB		 1293 break;
1294 case NL80211_IFTYPE_AP_VLAN:
1295 sdata = container_of(sdata->bss,
1296 struct ieee80211_sub_if_data, u.ap);
1297 /* fall through */
1298 default:
1299 vif = &sdata->vif;
1300 break;
e2ebc74d 1301 }
2de8e0d9 1302
cb831b53
JB		 1303 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1304 txpending);
11127e91 1305
74e4dbfd 1306 ieee80211_tpt_led_trig_tx(local, fc, led_len);
74e4dbfd 1307
4db4e0a1 1308 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1309
11127e91 1310 return result;
e2ebc74d
JB		 1311}
1312
97b045d6
JB		 1313/*
1314 * Invoke TX handlers, return 0 on success and non-zero if the
1315 * frame was dropped or queued.
1316 */
1317static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1318{
252b86c4 1319 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1320 ieee80211_tx_result res = TX_DROP;
97b045d6 1321
9aa4aee3
JB		 1322#define CALL_TXH(txh) \
1323 do { \
1324 res = txh(tx); \
1325 if (res != TX_CONTINUE) \
1326 goto txh_done; \
1327 } while (0)
1328
5c1b98a5 1329 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1330 CALL_TXH(ieee80211_tx_h_check_assoc);
1331 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1332 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1333 CALL_TXH(ieee80211_tx_h_select_key);
af65cd96
JB		 1334 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1335 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1336
aa5b5492
JB		 1337 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1338 __skb_queue_tail(&tx->skbs, tx->skb);
1339 tx->skb = NULL;
c6fcf6bc 1340 goto txh_done;
aa5b5492 1341 }
c6fcf6bc
JB		 1342
1343 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1344 CALL_TXH(ieee80211_tx_h_sequence);
1345 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1346 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1347 CALL_TXH(ieee80211_tx_h_stats);
1348 CALL_TXH(ieee80211_tx_h_encrypt);
8fd369ee
AN		 1349 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1350 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1351#undef CALL_TXH
97b045d6 1352
d9e8a70f 1353 txh_done:
97b045d6 1354 if (unlikely(res == TX_DROP)) {
5479d0e7 1355 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1356 if (tx->skb)
c3e7724b 1357 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4 1358 else
1f98ab7f 1359 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
97b045d6
JB		 1360 return -1;
1361 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1362 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1363 return -1;
1364 }
1365
1366 return 0;
1367}
1368
06be6b14
FF		 1369bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1370 struct ieee80211_vif *vif, struct sk_buff *skb,
1371 int band, struct ieee80211_sta **sta)
1372{
1373 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1374 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1375 struct ieee80211_tx_data tx;
1376
1377 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
1378 return false;
1379
1380 info->band = band;
1381 info->control.vif = vif;
1382 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1383
1384 if (invoke_tx_handlers(&tx))
1385 return false;
1386
1387 if (sta) {
1388 if (tx.sta)
1389 *sta = &tx.sta->sta;
1390 else
1391 *sta = NULL;
1392 }
1393
1394 return true;
1395}
1396EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1397
7bb45683
JB		 1398/*
1399 * Returns false if the frame couldn't be transmitted but was queued instead.
1400 */
1401static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
55de908a
JB		 1402 struct sk_buff *skb, bool txpending,
1403 enum ieee80211_band band)
e2ebc74d 1404{
3b8d81e0 1405 struct ieee80211_local *local = sdata->local;
5cf121c3 1406 struct ieee80211_tx_data tx;
97b045d6 1407 ieee80211_tx_result res_prepare;
e039fa4a 1408 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1409 bool result = true;
74e4dbfd 1410 int led_len;
e2ebc74d 1411
e2ebc74d
JB		 1412 if (unlikely(skb->len < 10)) {
1413 dev_kfree_skb(skb);
7bb45683 1414 return true;
e2ebc74d
JB		 1415 }
1416
58d4185e 1417 /* initialises tx */
74e4dbfd 1418 led_len = skb->len;
3b8d81e0 1419 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
e2ebc74d 1420
cd8ffc80 1421 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1422 ieee80211_free_txskb(&local->hw, skb);
55de908a 1423 return true;
cd8ffc80 1424 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1425 return true;
e2ebc74d
JB		 1426 }
1427
55de908a 1428 info->band = band;
e2ebc74d 1429
3a25a8c8
JB		 1430 /* set up hw_queue value early */
1431 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1432 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1433 info->hw_queue =
1434 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1435
7bb45683 1436 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1437 result = __ieee80211_tx(local, &tx.skbs, led_len,
1438 tx.sta, txpending);
55de908a 1439
7bb45683 1440 return result;
e2ebc74d
JB		 1441}
1442
1443/* device xmit handlers */
1444
3bff1865 1445static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1446 struct sk_buff *skb,
1447 int head_need, bool may_encrypt)
1448{
3bff1865 1449 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1450 int tail_need = 0;
1451
3bff1865 1452 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1453 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1454 tail_need -= skb_tailroom(skb);
1455 tail_need = max_t(int, tail_need, 0);
1456 }
1457
fc7c976d 1458 if (skb_cloned(skb))
23c0752a 1459 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1460 else if (head_need || tail_need)
23c0752a 1461 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1462 else
1463 return 0;
23c0752a
JB		 1464
1465 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1466 wiphy_debug(local->hw.wiphy,
1467 "failed to reallocate TX buffer\n");
23c0752a
JB		 1468 return -ENOMEM;
1469 }
1470
23c0752a
JB		 1471 return 0;
1472}
1473
55de908a
JB		 1474void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1475 enum ieee80211_band band)
e2ebc74d 1476{
3b8d81e0 1477 struct ieee80211_local *local = sdata->local;
e039fa4a 1478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1480 int headroom;
23c0752a 1481 bool may_encrypt;
e2ebc74d 1482
3b8d81e0 1483 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1484
3b8d81e0 1485 headroom = local->tx_headroom;
23c0752a
JB		 1486 if (may_encrypt)
1487 headroom += IEEE80211_ENCRYPT_HEADROOM;
1488 headroom -= skb_headroom(skb);
1489 headroom = max_t(int, 0, headroom);
1490
3bff1865 1491 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1492 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1493 return;
e2ebc74d
JB		 1494 }
1495
740c1aa3 1496 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1497 info->control.vif = &sdata->vif;
e2ebc74d 1498
3f52b7e3
MP		 1499 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1500 if (ieee80211_is_data(hdr->frame_control) &&
1501 is_unicast_ether_addr(hdr->addr1)) {
bf7cd94d 1502 if (mesh_nexthop_resolve(sdata, skb))
3f52b7e3
MP		 1503 return; /* skb queued: don't free */
1504 } else {
1505 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1506 }
98aed9fd 1507 }
cca89496 1508
2154c81c 1509 ieee80211_set_qos_hdr(sdata, skb);
55de908a 1510 ieee80211_tx(sdata, skb, false, band);
e2ebc74d
JB		 1511}
1512
73b9f03a
JB		 1513static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1514{
1515 struct ieee80211_radiotap_iterator iterator;
1516 struct ieee80211_radiotap_header *rthdr =
1517 (struct ieee80211_radiotap_header *) skb->data;
1518 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1519 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1520 NULL);
1521 u16 txflags;
1522
1523 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1524 IEEE80211_TX_CTL_DONTFRAG;
1525
1526 /*
1527 * for every radiotap entry that is present
1528 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1529 * entries present, or -EINVAL on error)
1530 */
1531
1532 while (!ret) {
1533 ret = ieee80211_radiotap_iterator_next(&iterator);
1534
1535 if (ret)
1536 continue;
1537
1538 /* see if this argument is something we can use */
1539 switch (iterator.this_arg_index) {
1540 /*
1541 * You must take care when dereferencing iterator.this_arg
1542 * for multibyte types... the pointer is not aligned. Use
1543 * get_unaligned((type *)iterator.this_arg) to dereference
1544 * iterator.this_arg for type "type" safely on all arches.
1545 */
1546 case IEEE80211_RADIOTAP_FLAGS:
1547 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1548 /*
1549 * this indicates that the skb we have been
1550 * handed has the 32-bit FCS CRC at the end...
1551 * we should react to that by snipping it off
1552 * because it will be recomputed and added
1553 * on transmission
1554 */
1555 if (skb->len < (iterator._max_length + FCS_LEN))
1556 return false;
1557
1558 skb_trim(skb, skb->len - FCS_LEN);
1559 }
1560 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1561 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1562 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1563 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1564 break;
1565
1566 case IEEE80211_RADIOTAP_TX_FLAGS:
1567 txflags = get_unaligned_le16(iterator.this_arg);
1568 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1569 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1570 break;
1571
1572 /*
1573 * Please update the file
1574 * Documentation/networking/mac80211-injection.txt
1575 * when parsing new fields here.
1576 */
1577
1578 default:
1579 break;
1580 }
1581 }
1582
1583 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1584 return false;
1585
1586 /*
1587 * remove the radiotap header
1588 * iterator->_max_length was sanity-checked against
1589 * skb->len by iterator init
1590 */
1591 skb_pull(skb, iterator._max_length);
1592
1593 return true;
1594}
1595
d0cf9c0d
SH		 1596netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1597 struct net_device *dev)
e2ebc74d
JB		 1598{
1599 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a
JB		 1600 struct ieee80211_chanctx_conf *chanctx_conf;
1601 struct ieee80211_channel *chan;
e2ebc74d
JB		 1602 struct ieee80211_radiotap_header *prthdr =
1603 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1604 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1605 struct ieee80211_hdr *hdr;
5d9cf4a5 1606 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
9b8a74e3 1607 u16 len_rthdr;
5d9cf4a5 1608 int hdrlen;
e2ebc74d 1609
9b8a74e3
AG		 1610 /* check for not even having the fixed radiotap header part */
1611 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1612 goto fail; /* too short to be possibly valid */
1613
1614 /* is it a header version we can trust to find length from? */
1615 if (unlikely(prthdr->it_version))
1616 goto fail; /* only version 0 is supported */
1617
1618 /* then there must be a radiotap header with a length we can use */
1619 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1620
1621 /* does the skb contain enough to deliver on the alleged length? */
1622 if (unlikely(skb->len < len_rthdr))
1623 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1624
e2ebc74d
JB		 1625 /*
1626 * fix up the pointers accounting for the radiotap
1627 * header still being in there. We are being given
1628 * a precooked IEEE80211 header so no need for
1629 * normal processing
1630 */
9b8a74e3 1631 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1632 /*
9b8a74e3
AG		 1633 * these are just fixed to the end of the rt area since we
1634 * don't have any better information and at this point, nobody cares
e2ebc74d 1635 */
9b8a74e3
AG		 1636 skb_set_network_header(skb, len_rthdr);
1637 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1638
5d9cf4a5
JB		 1639 if (skb->len < len_rthdr + 2)
1640 goto fail;
1641
1642 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1643 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1644
1645 if (skb->len < len_rthdr + hdrlen)
1646 goto fail;
1647
f75f5c6f
HS		 1648 /*
1649 * Initialize skb->protocol if the injected frame is a data frame
1650 * carrying a rfc1042 header
1651 */
5d9cf4a5
JB		 1652 if (ieee80211_is_data(hdr->frame_control) &&
1653 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1654 u8 *payload = (u8 *)hdr + hdrlen;
1655
b203ca39 1656 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1657 skb->protocol = cpu_to_be16((payload[6] << 8) |
1658 payload[7]);
f75f5c6f
HS		 1659 }
1660
3b8d81e0
JB		 1661 memset(info, 0, sizeof(*info));
1662
5d9cf4a5 1663 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1664 IEEE80211_TX_CTL_INJECTED;
1665
1666 /* process and remove the injection radiotap header */
1667 if (!ieee80211_parse_tx_radiotap(skb))
1668 goto fail;
5d9cf4a5
JB		 1669
1670 rcu_read_lock();
1671
1672 /*
1673 * We process outgoing injected frames that have a local address
1674 * we handle as though they are non-injected frames.
1675 * This code here isn't entirely correct, the local MAC address
1676 * isn't always enough to find the interface to use; for proper
1677 * VLAN/WDS support we will need a different mechanism (which
1678 * likely isn't going to be monitor interfaces).
1679 */
1680 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1681
1682 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1683 if (!ieee80211_sdata_running(tmp_sdata))
1684 continue;
1685 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1686 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1687 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1688 continue;
b203ca39 1689 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1690 sdata = tmp_sdata;
1691 break;
1692 }
1693 }
7351c6bd 1694
55de908a
JB		 1695 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1696 if (!chanctx_conf) {
1697 tmp_sdata = rcu_dereference(local->monitor_sdata);
1698 if (tmp_sdata)
1699 chanctx_conf =
1700 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1701 }
55de908a 1702
b4a7ff75
FF		 1703 if (chanctx_conf)
1704 chan = chanctx_conf->def.chan;
1705 else if (!local->use_chanctx)
675a0b04 1706 chan = local->_oper_chandef.chan;
b4a7ff75
FF		 1707 else
1708 goto fail_rcu;
55de908a
JB		 1709
1710 /*
1711 * Frame injection is not allowed if beaconing is not allowed
1712 * or if we need radar detection. Beaconing is usually not allowed when
1713 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1714 * Passive scan is also used in world regulatory domains where
1715 * your country is not known and as such it should be treated as
1716 * NO TX unless the channel is explicitly allowed in which case
1717 * your current regulatory domain would not have the passive scan
1718 * flag.
1719 *
1720 * Since AP mode uses monitor interfaces to inject/TX management
1721 * frames we can make AP mode the exception to this rule once it
1722 * supports radar detection as its implementation can deal with
1723 * radar detection by itself. We can do that later by adding a
1724 * monitor flag interfaces used for AP support.
1725 */
1726 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1727 IEEE80211_CHAN_PASSIVE_SCAN)))
1728 goto fail_rcu;
1729
1730 ieee80211_xmit(sdata, skb, chan->band);
5d9cf4a5
JB		 1731 rcu_read_unlock();
1732
e2ebc74d 1733 return NETDEV_TX_OK;
9b8a74e3 1734
55de908a
JB		 1735fail_rcu:
1736 rcu_read_unlock();
9b8a74e3
AG		 1737fail:
1738 dev_kfree_skb(skb);
1739 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1740}
1741
1742/**
1743 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1744 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1745 * @skb: packet to be sent
1746 * @dev: incoming interface
1747 *
1748 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1749 * not be freed, and caller is responsible for either retrying later or freeing
1750 * skb).
1751 *
1752 * This function takes in an Ethernet header and encapsulates it with suitable
1753 * IEEE 802.11 header based on which interface the packet is coming in. The
1754 * encapsulated packet will then be passed to master interface, wlan#.11, for
1755 * transmission (through low-level driver).
1756 */
d0cf9c0d
SH		 1757netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1758 struct net_device *dev)
e2ebc74d 1759{
133b8226
JB		 1760 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1761 struct ieee80211_local *local = sdata->local;
489ee919 1762 struct ieee80211_tx_info *info;
dcf33963 1763 int head_need;
065e9605
HH		 1764 u16 ethertype, hdrlen, meshhdrlen = 0;
1765 __le16 fc;
e2ebc74d 1766 struct ieee80211_hdr hdr;
ff67bb86 1767 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 1768 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 1769 const u8 *encaps_data;
1770 int encaps_len, skip_header_bytes;
e8bf9649 1771 int nh_pos, h_pos;
f14543ee 1772 struct sta_info *sta = NULL;
c2c98fde 1773 bool wme_sta = false, authorized = false, tdls_auth = false;
941c93cd 1774 bool tdls_direct = false;
a729cff8
JB		 1775 bool multicast;
1776 u32 info_flags = 0;
1777 u16 info_id = 0;
55de908a
JB		 1778 struct ieee80211_chanctx_conf *chanctx_conf;
1779 struct ieee80211_sub_if_data *ap_sdata;
1780 enum ieee80211_band band;
e2ebc74d 1781
dcf33963 1782 if (unlikely(skb->len < ETH_HLEN))
e2ebc74d 1783 goto fail;
e2ebc74d 1784
e2ebc74d
JB		 1785 /* convert Ethernet header to proper 802.11 header (based on
1786 * operation mode) */
1787 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 1788 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 1789
55de908a
JB		 1790 rcu_read_lock();
1791
51fb61e7 1792 switch (sdata->vif.type) {
05c914fe 1793 case NL80211_IFTYPE_AP_VLAN:
9bc383de 1794 sta = rcu_dereference(sdata->u.vlan.sta);
f14543ee
FF		 1795 if (sta) {
1796 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1797 /* RA TA DA SA */
1798 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 1799 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1800 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1801 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1802 hdrlen = 30;
c2c98fde
JB		 1803 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1804 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
f14543ee 1805 }
55de908a
JB		 1806 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1807 u.ap);
1808 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1809 if (!chanctx_conf)
1810 goto fail_rcu;
4bf88530 1811 band = chanctx_conf->def.chan->band;
f14543ee
FF		 1812 if (sta)
1813 break;
1814 /* fall through */
1815 case NL80211_IFTYPE_AP:
fe80123d
AB		 1816 if (sdata->vif.type == NL80211_IFTYPE_AP)
1817 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1818 if (!chanctx_conf)
1819 goto fail_rcu;
065e9605 1820 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 1821 /* DA BSSID SA */
1822 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 1823 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1824 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1825 hdrlen = 24;
4bf88530 1826 band = chanctx_conf->def.chan->band;
cf966838 1827 break;
05c914fe 1828 case NL80211_IFTYPE_WDS:
065e9605 1829 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 1830 /* RA TA DA SA */
1831 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 1832 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1833 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1834 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1835 hdrlen = 30;
55de908a
JB		 1836 /*
1837 * This is the exception! WDS style interfaces are prohibited
1838 * when channel contexts are in used so this must be valid
1839 */
675a0b04 1840 band = local->hw.conf.chandef.chan->band;
cf966838 1841 break;
33b64eb2 1842#ifdef CONFIG_MAC80211_MESH
05c914fe 1843 case NL80211_IFTYPE_MESH_POINT:
b8bacc18 1844 if (!is_multicast_ether_addr(skb->data)) {
163df6cf
CYY		 1845 struct sta_info *next_hop;
1846 bool mpp_lookup = true;
1847
bf7cd94d 1848 mpath = mesh_path_lookup(sdata, skb->data);
163df6cf
CYY		 1849 if (mpath) {
1850 mpp_lookup = false;
1851 next_hop = rcu_dereference(mpath->next_hop);
1852 if (!next_hop ||
1853 !(mpath->flags & (MESH_PATH_ACTIVE |
1854 MESH_PATH_RESOLVING)))
1855 mpp_lookup = true;
1856 }
1857
1858 if (mpp_lookup)
bf7cd94d 1859 mppath = mpp_path_lookup(sdata, skb->data);
163df6cf
CYY		 1860
1861 if (mppath && mpath)
1862 mesh_path_del(mpath->sdata, mpath->dst);
b8bacc18 1863 }
79617dee 1864
f76b57b4 1865 /*
9d52501b
JF		 1866 * Use address extension if it is a packet from
1867 * another interface or if we know the destination
1868 * is being proxied by a portal (i.e. portal address
1869 * differs from proxied address)
f76b57b4 1870 */
b203ca39
JP		 1871 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1872 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 1873 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1874 skb->data, skb->data + ETH_ALEN);
bf7cd94d
JB		 1875 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1876 NULL, NULL);
79617dee 1877 } else {
27f01124
TP		 1878 /* DS -> MBSS (802.11-2012 13.11.3.3).
1879 * For unicast with unknown forwarding information,
1880 * destination might be in the MBSS or if that fails
1881 * forwarded to another mesh gate. In either case
1882 * resolution will be handled in ieee80211_xmit(), so
1883 * leave the original DA. This also works for mcast */
1884 const u8 *mesh_da = skb->data;
1885
1886 if (mppath)
1887 mesh_da = mppath->mpp;
1888 else if (mpath)
1889 mesh_da = mpath->dst;
79617dee 1890
3c5772a5 1891 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 1892 mesh_da, sdata->vif.addr);
27f01124
TP		 1893 if (is_multicast_ether_addr(mesh_da))
1894 /* DA TA mSA AE:SA */
bf7cd94d
JB		 1895 meshhdrlen = ieee80211_new_mesh_header(
1896 sdata, &mesh_hdr,
1897 skb->data + ETH_ALEN, NULL);
3c5772a5 1898 else
27f01124 1899 /* RA TA mDA mSA AE:DA SA */
bf7cd94d
JB		 1900 meshhdrlen = ieee80211_new_mesh_header(
1901 sdata, &mesh_hdr, skb->data,
1902 skb->data + ETH_ALEN);
79617dee 1903
79617dee 1904 }
55de908a
JB		 1905 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1906 if (!chanctx_conf)
1907 goto fail_rcu;
4bf88530 1908 band = chanctx_conf->def.chan->band;
33b64eb2
LCC		 1909 break;
1910#endif
05c914fe 1911 case NL80211_IFTYPE_STATION:
941c93cd 1912 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
c2c98fde
JB		 1913 bool tdls_peer = false;
1914
941c93cd 1915 sta = sta_info_get(sdata, skb->data);
c2c98fde
JB		 1916 if (sta) {
1917 authorized = test_sta_flag(sta,
1918 WLAN_STA_AUTHORIZED);
1919 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1920 tdls_peer = test_sta_flag(sta,
1921 WLAN_STA_TDLS_PEER);
1922 tdls_auth = test_sta_flag(sta,
1923 WLAN_STA_TDLS_PEER_AUTH);
1924 }
941c93cd
AN		 1925
1926 /*
1927 * If the TDLS link is enabled, send everything
1928 * directly. Otherwise, allow TDLS setup frames
1929 * to be transmitted indirectly.
1930 */
c2c98fde 1931 tdls_direct = tdls_peer && (tdls_auth ||
941c93cd
AN		 1932 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1933 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1934 }
1935
1936 if (tdls_direct) {
1937 /* link during setup - throw out frames to peer */
dcf33963 1938 if (!tdls_auth)
55de908a 1939 goto fail_rcu;
941c93cd
AN		 1940
1941 /* DA SA BSSID */
1942 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1943 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1944 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1945 hdrlen = 24;
1946 } else if (sdata->u.mgd.use_4addr &&
1947 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1948 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1949 IEEE80211_FCTL_TODS);
f14543ee 1950 /* RA TA DA SA */
941c93cd 1951 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 1952 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1953 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1954 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1955 hdrlen = 30;
1956 } else {
1957 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1958 /* BSSID SA DA */
941c93cd 1959 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 1960 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1961 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1962 hdrlen = 24;
1963 }
55de908a
JB		 1964 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1965 if (!chanctx_conf)
1966 goto fail_rcu;
4bf88530 1967 band = chanctx_conf->def.chan->band;
cf966838 1968 break;
05c914fe 1969 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 1970 /* DA SA BSSID */
1971 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1972 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 1973 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 1974 hdrlen = 24;
55de908a
JB		 1975 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1976 if (!chanctx_conf)
1977 goto fail_rcu;
4bf88530 1978 band = chanctx_conf->def.chan->band;
cf966838
JB		 1979 break;
1980 default:
55de908a 1981 goto fail_rcu;
e2ebc74d
JB		 1982 }
1983
7d185b8b
JB		 1984 /*
1985 * There's no need to try to look up the destination
1986 * if it is a multicast address (which can only happen
1987 * in AP mode)
1988 */
a729cff8
JB		 1989 multicast = is_multicast_ether_addr(hdr.addr1);
1990 if (!multicast) {
abe60632 1991 sta = sta_info_get(sdata, hdr.addr1);
c2c98fde
JB		 1992 if (sta) {
1993 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1994 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1995 }
e2ebc74d
JB		 1996 }
1997
4777be41
JC		 1998 /* For mesh, the use of the QoS header is mandatory */
1999 if (ieee80211_vif_is_mesh(&sdata->vif))
c2c98fde 2000 wme_sta = true;
4777be41 2001
3434fbd3 2002 /* receiver and we are QoS enabled, use a QoS type frame */
32c5057b 2003 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
065e9605 2004 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 2005 hdrlen += 2;
2006 }
2007
2008 /*
238814fd
JB		 2009 * Drop unicast frames to unauthorised stations unless they are
2010 * EAPOL frames from the local station.
ce3edf6d 2011 */
55182e4a 2012 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
a6ececf4 2013 !multicast && !authorized &&
55182e4a 2014 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 2015 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 2016#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 2017 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
e87cc472 2018 dev->name, hdr.addr1);
ce3edf6d
JB		 2019#endif
2020
2021 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2022
55de908a 2023 goto fail_rcu;
ce3edf6d
JB		 2024 }
2025
a729cff8
JB		 2026 if (unlikely(!multicast && skb->sk &&
2027 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2028 struct sk_buff *orig_skb = skb;
2029
2030 skb = skb_clone(skb, GFP_ATOMIC);
2031 if (skb) {
2032 unsigned long flags;
9475af6e 2033 int id;
a729cff8
JB		 2034
2035 spin_lock_irqsave(&local->ack_status_lock, flags);
9475af6e
TH		 2036 id = idr_alloc(&local->ack_status_frames, orig_skb,
2037 1, 0x10000, GFP_ATOMIC);
a729cff8
JB		 2038 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2039
9475af6e 2040 if (id >= 0) {
a729cff8
JB		 2041 info_id = id;
2042 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2043 } else if (skb_shared(skb)) {
2044 kfree_skb(orig_skb);
2045 } else {
2046 kfree_skb(skb);
2047 skb = orig_skb;
2048 }
2049 } else {
2050 /* couldn't clone -- lose tx status ... */
2051 skb = orig_skb;
2052 }
2053 }
2054
7e244707
HS		 2055 /*
2056 * If the skb is shared we need to obtain our own copy.
2057 */
2058 if (skb_shared(skb)) {
a729cff8
JB		 2059 struct sk_buff *tmp_skb = skb;
2060
2061 /* can't happen -- skb is a clone if info_id != 0 */
2062 WARN_ON(info_id);
2063
f8a0a781 2064 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2065 kfree_skb(tmp_skb);
2066
dcf33963 2067 if (!skb)
55de908a 2068 goto fail_rcu;
7e244707
HS		 2069 }
2070
065e9605 2071 hdr.frame_control = fc;
e2ebc74d
JB		 2072 hdr.duration_id = 0;
2073 hdr.seq_ctrl = 0;
2074
2075 skip_header_bytes = ETH_HLEN;
2076 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2077 encaps_data = bridge_tunnel_header;
2078 encaps_len = sizeof(bridge_tunnel_header);
2079 skip_header_bytes -= 2;
e5c5d22e 2080 } else if (ethertype >= ETH_P_802_3_MIN) {
e2ebc74d
JB		 2081 encaps_data = rfc1042_header;
2082 encaps_len = sizeof(rfc1042_header);
2083 skip_header_bytes -= 2;
2084 } else {
2085 encaps_data = NULL;
2086 encaps_len = 0;
2087 }
2088
7e244707
HS		 2089 nh_pos = skb_network_header(skb) - skb->data;
2090 h_pos = skb_transport_header(skb) - skb->data;
2091
e2ebc74d
JB		 2092 skb_pull(skb, skip_header_bytes);
2093 nh_pos -= skip_header_bytes;
2094 h_pos -= skip_header_bytes;
2095
23c0752a 2096 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2097
23c0752a
JB		 2098 /*
2099 * So we need to modify the skb header and hence need a copy of
2100 * that. The head_need variable above doesn't, so far, include
2101 * the needed header space that we don't need right away. If we
2102 * can, then we don't reallocate right now but only after the
2103 * frame arrives at the master device (if it does...)
2104 *
2105 * If we cannot, however, then we will reallocate to include all
2106 * the ever needed space. Also, if we need to reallocate it anyway,
2107 * make it big enough for everything we may ever need.
2108 */
e2ebc74d 2109
3a5be7d4 2110 if (head_need > 0 || skb_cloned(skb)) {
23c0752a
JB		 2111 head_need += IEEE80211_ENCRYPT_HEADROOM;
2112 head_need += local->tx_headroom;
2113 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2114 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2115 ieee80211_free_txskb(&local->hw, skb);
1c963bec 2116 skb = NULL;
55de908a 2117 goto fail_rcu;
c3e7724b 2118 }
e2ebc74d
JB		 2119 }
2120
2121 if (encaps_data) {
2122 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2123 nh_pos += encaps_len;
2124 h_pos += encaps_len;
2125 }
c29b9b9b 2126
e4ab7eb0 2127#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2128 if (meshhdrlen > 0) {
2129 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2130 nh_pos += meshhdrlen;
2131 h_pos += meshhdrlen;
2132 }
e4ab7eb0 2133#endif
33b64eb2 2134
065e9605 2135 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2136 __le16 *qos_control;
2137
2138 qos_control = (__le16*) skb_push(skb, 2);
2139 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2140 /*
2141 * Maybe we could actually set some fields here, for now just
2142 * initialise to zero to indicate no special operation.
2143 */
2144 *qos_control = 0;
2145 } else
2146 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2147
e2ebc74d
JB		 2148 nh_pos += hdrlen;
2149 h_pos += hdrlen;
2150
68aae116
SH		 2151 dev->stats.tx_packets++;
2152 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 2153
2154 /* Update skb pointers to various headers since this modified frame
2155 * is going to go through Linux networking code that may potentially
2156 * need things like pointer to IP header. */
2157 skb_set_mac_header(skb, 0);
2158 skb_set_network_header(skb, nh_pos);
2159 skb_set_transport_header(skb, h_pos);
2160
489ee919 2161 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2162 memset(info, 0, sizeof(*info));
2163
e2ebc74d 2164 dev->trans_start = jiffies;
a729cff8
JB		 2165
2166 info->flags = info_flags;
2167 info->ack_frame_id = info_id;
2168
55de908a
JB		 2169 ieee80211_xmit(sdata, skb, band);
2170 rcu_read_unlock();
e2ebc74d 2171
ec634fe3 2172 return NETDEV_TX_OK;
e2ebc74d 2173
55de908a
JB		 2174 fail_rcu:
2175 rcu_read_unlock();
e2ebc74d 2176 fail:
dcf33963
JB		 2177 dev_kfree_skb(skb);
2178 return NETDEV_TX_OK;
e2ebc74d
JB		 2179}
2180
e2ebc74d 2181
e2530083
JB		 2182/*
2183 * ieee80211_clear_tx_pending may not be called in a context where
2184 * it is possible that it packets could come in again.
2185 */
e2ebc74d
JB		 2186void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2187{
1f98ab7f 2188 struct sk_buff *skb;
2de8e0d9 2189 int i;
e2ebc74d 2190
1f98ab7f
FF		 2191 for (i = 0; i < local->hw.queues; i++) {
2192 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2193 ieee80211_free_txskb(&local->hw, skb);
2194 }
e2ebc74d
JB		 2195}
2196
7bb45683
JB		 2197/*
2198 * Returns false if the frame couldn't be transmitted but was queued instead,
2199 * which in this case means re-queued -- take as an indication to stop sending
2200 * more pending frames.
2201 */
cd8ffc80
JB		 2202static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2203 struct sk_buff *skb)
2204{
2205 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2206 struct ieee80211_sub_if_data *sdata;
2207 struct sta_info *sta;
2208 struct ieee80211_hdr *hdr;
7bb45683 2209 bool result;
55de908a 2210 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 2211
5061b0c2 2212 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 2213
2214 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 2215 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2216 if (unlikely(!chanctx_conf)) {
2217 dev_kfree_skb(skb);
2218 return true;
2219 }
2220 result = ieee80211_tx(sdata, skb, true,
4bf88530 2221 chanctx_conf->def.chan->band);
cd8ffc80 2222 } else {
252b86c4
JB		 2223 struct sk_buff_head skbs;
2224
2225 __skb_queue_head_init(&skbs);
2226 __skb_queue_tail(&skbs, skb);
2227
cd8ffc80 2228 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 2229 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 2230
74e4dbfd 2231 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 2232 }
2233
cd8ffc80
JB		 2234 return result;
2235}
2236
e2530083 2237/*
3b8d81e0 2238 * Transmit all pending packets. Called from tasklet.
e2530083 2239 */
e2ebc74d
JB		 2240void ieee80211_tx_pending(unsigned long data)
2241{
2242 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 2243 unsigned long flags;
cd8ffc80 2244 int i;
3b8d81e0 2245 bool txok;
e2ebc74d 2246
f0e72851 2247 rcu_read_lock();
e2530083 2248
3b8d81e0 2249 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 2250 for (i = 0; i < local->hw.queues; i++) {
2251 /*
2252 * If queue is stopped by something other than due to pending
2253 * frames, or we have no pending frames, proceed to next queue.
2254 */
3b8d81e0 2255 if (local->queue_stop_reasons[i] ||
2a577d98 2256 skb_queue_empty(&local->pending[i]))
e2ebc74d 2257 continue;
e2530083 2258
2a577d98 2259 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 2260 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 2261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 2262
a7bc376c 2263 if (WARN_ON(!info->control.vif)) {
c3e7724b 2264 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 2265 continue;
2266 }
2267
3b8d81e0
JB		 2268 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2269 flags);
2270
2271 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 2272 spin_lock_irqsave(&local->queue_stop_reason_lock,
2273 flags);
2274 if (!txok)
2a577d98 2275 break;
e2ebc74d 2276 }
7236fe29
JB		 2277
2278 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 2279 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 2280 }
3b8d81e0 2281 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 2282
f0e72851 2283 rcu_read_unlock();
e2ebc74d
JB		 2284}
2285
2286/* functions for drivers to get certain frames */
2287
eac70c13
MP		 2288static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2289 struct ps_data *ps, struct sk_buff *skb)
e2ebc74d
JB		 2290{
2291 u8 *pos, *tim;
2292 int aid0 = 0;
2293 int i, have_bits = 0, n1, n2;
2294
2295 /* Generate bitmap for TIM only if there are any STAs in power save
2296 * mode. */
d012a605 2297 if (atomic_read(&ps->num_sta_ps) > 0)
e2ebc74d
JB		 2298 /* in the hope that this is faster than
2299 * checking byte-for-byte */
d012a605 2300 have_bits = !bitmap_empty((unsigned long*)ps->tim,
e2ebc74d
JB		 2301 IEEE80211_MAX_AID+1);
2302
d012a605
MP		 2303 if (ps->dtim_count == 0)
2304 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
e2ebc74d 2305 else
d012a605 2306 ps->dtim_count--;
e2ebc74d
JB		 2307
2308 tim = pos = (u8 *) skb_put(skb, 6);
2309 *pos++ = WLAN_EID_TIM;
2310 *pos++ = 4;
d012a605 2311 *pos++ = ps->dtim_count;
8860020e 2312 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d 2313
d012a605 2314 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
e2ebc74d
JB		 2315 aid0 = 1;
2316
d012a605 2317 ps->dtim_bc_mc = aid0 == 1;
512119b3 2318
e2ebc74d
JB		 2319 if (have_bits) {
2320 /* Find largest even number N1 so that bits numbered 1 through
2321 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2322 * (N2 + 1) x 8 through 2007 are 0. */
2323 n1 = 0;
2324 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
d012a605 2325 if (ps->tim[i]) {
e2ebc74d
JB		 2326 n1 = i & 0xfe;
2327 break;
2328 }
2329 }
2330 n2 = n1;
2331 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
d012a605 2332 if (ps->tim[i]) {
e2ebc74d
JB		 2333 n2 = i;
2334 break;
2335 }
2336 }
2337
2338 /* Bitmap control */
2339 *pos++ = n1 | aid0;
2340 /* Part Virt Bitmap */
5220da39 2341 skb_put(skb, n2 - n1);
d012a605 2342 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
e2ebc74d
JB		 2343
2344 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 2345 } else {
2346 *pos++ = aid0; /* Bitmap control */
2347 *pos++ = 0; /* Part Virt Bitmap */
2348 }
e2ebc74d
JB		 2349}
2350
eac70c13
MP		 2351static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2352 struct ps_data *ps, struct sk_buff *skb)
2353{
2354 struct ieee80211_local *local = sdata->local;
2355
2356 /*
2357 * Not very nice, but we want to allow the driver to call
2358 * ieee80211_beacon_get() as a response to the set_tim()
2359 * callback. That, however, is already invoked under the
2360 * sta_lock to guarantee consistent and race-free update
2361 * of the tim bitmap in mac80211 and the driver.
2362 */
2363 if (local->tim_in_locked_section) {
2364 __ieee80211_beacon_add_tim(sdata, ps, skb);
2365 } else {
1b91731d 2366 spin_lock_bh(&local->tim_lock);
eac70c13 2367 __ieee80211_beacon_add_tim(sdata, ps, skb);
1b91731d 2368 spin_unlock_bh(&local->tim_lock);
eac70c13
MP		 2369 }
2370
2371 return 0;
2372}
2373
73da7d5b
SW		 2374void ieee80211_csa_finish(struct ieee80211_vif *vif)
2375{
2376 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2377
2378 ieee80211_queue_work(&sdata->local->hw,
2379 &sdata->csa_finalize_work);
2380}
2381EXPORT_SYMBOL(ieee80211_csa_finish);
2382
2383static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata,
2384 struct beacon_data *beacon)
2385{
2386 struct probe_resp *resp;
2387 int counter_offset_beacon = sdata->csa_counter_offset_beacon;
2388 int counter_offset_presp = sdata->csa_counter_offset_presp;
cd7760e6
SW		 2389 u8 *beacon_data;
2390 size_t beacon_data_len;
2391
2392 switch (sdata->vif.type) {
2393 case NL80211_IFTYPE_AP:
2394 beacon_data = beacon->tail;
2395 beacon_data_len = beacon->tail_len;
2396 break;
2397 case NL80211_IFTYPE_ADHOC:
2398 beacon_data = beacon->head;
2399 beacon_data_len = beacon->head_len;
2400 break;
2401 default:
2402 return;
2403 }
2404 if (WARN_ON(counter_offset_beacon >= beacon_data_len))
2405 return;
73da7d5b
SW		 2406
2407 /* warn if the driver did not check for/react to csa completeness */
cd7760e6 2408 if (WARN_ON(beacon_data[counter_offset_beacon] == 0))
73da7d5b
SW		 2409 return;
2410
cd7760e6 2411 beacon_data[counter_offset_beacon]--;
73da7d5b 2412
cd7760e6 2413 if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) {
73da7d5b
SW		 2414 rcu_read_lock();
2415 resp = rcu_dereference(sdata->u.ap.probe_resp);
2416
2417 /* if nl80211 accepted the offset, this should not happen. */
2418 if (WARN_ON(!resp)) {
2419 rcu_read_unlock();
2420 return;
2421 }
2422 resp->data[counter_offset_presp]--;
2423 rcu_read_unlock();
2424 }
2425}
2426
2427bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2428{
2429 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2430 struct beacon_data *beacon = NULL;
2431 u8 *beacon_data;
2432 size_t beacon_data_len;
2433 int counter_beacon = sdata->csa_counter_offset_beacon;
2434 int ret = false;
2435
2436 if (!ieee80211_sdata_running(sdata))
2437 return false;
2438
2439 rcu_read_lock();
2440 if (vif->type == NL80211_IFTYPE_AP) {
2441 struct ieee80211_if_ap *ap = &sdata->u.ap;
2442
2443 beacon = rcu_dereference(ap->beacon);
2444 if (WARN_ON(!beacon || !beacon->tail))
2445 goto out;
2446 beacon_data = beacon->tail;
2447 beacon_data_len = beacon->tail_len;
cd7760e6
SW		 2448 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
2449 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2450
2451 beacon = rcu_dereference(ifibss->presp);
2452 if (!beacon)
2453 goto out;
2454
2455 beacon_data = beacon->head;
2456 beacon_data_len = beacon->head_len;
73da7d5b
SW		 2457 } else {
2458 WARN_ON(1);
2459 goto out;
2460 }
2461
2462 if (WARN_ON(counter_beacon > beacon_data_len))
2463 goto out;
2464
2465 if (beacon_data[counter_beacon] == 0)
2466 ret = true;
2467 out:
2468 rcu_read_unlock();
2469
2470 return ret;
2471}
2472EXPORT_SYMBOL(ieee80211_csa_is_complete);
2473
eddcbb94
JB		 2474struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2475 struct ieee80211_vif *vif,
2476 u16 *tim_offset, u16 *tim_length)
e2ebc74d
JB		 2477{
2478 struct ieee80211_local *local = hw_to_local(hw);
9d139c81 2479 struct sk_buff *skb = NULL;
e039fa4a 2480 struct ieee80211_tx_info *info;
e2ebc74d 2481 struct ieee80211_sub_if_data *sdata = NULL;
55de908a 2482 enum ieee80211_band band;
e00cfce0 2483 struct ieee80211_tx_rate_control txrc;
55de908a 2484 struct ieee80211_chanctx_conf *chanctx_conf;
8318d78a 2485
5dfdaf58 2486 rcu_read_lock();
e2ebc74d 2487
32bfd35d 2488 sdata = vif_to_sdata(vif);
55de908a 2489 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 2490
55de908a 2491 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 2492 goto out;
2493
eddcbb94
JB		 2494 if (tim_offset)
2495 *tim_offset = 0;
2496 if (tim_length)
2497 *tim_length = 0;
2498
05c914fe 2499 if (sdata->vif.type == NL80211_IFTYPE_AP) {
d012a605
MP		 2500 struct ieee80211_if_ap *ap = &sdata->u.ap;
2501 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2502
3ad97fbc 2503 if (beacon) {
73da7d5b
SW		 2504 if (sdata->vif.csa_active)
2505 ieee80211_update_csa(sdata, beacon);
2506
902acc78
JB		 2507 /*
2508 * headroom, head length,
2509 * tail length and maximum TIM length
2510 */
2511 skb = dev_alloc_skb(local->tx_headroom +
2512 beacon->head_len +
2513 beacon->tail_len + 256);
2514 if (!skb)
2515 goto out;
33b64eb2 2516
902acc78
JB		 2517 skb_reserve(skb, local->tx_headroom);
2518 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2519 beacon->head_len);
33b64eb2 2520
eac70c13 2521 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
33b64eb2 2522
eddcbb94
JB		 2523 if (tim_offset)
2524 *tim_offset = beacon->head_len;
2525 if (tim_length)
2526 *tim_length = skb->len - beacon->head_len;
2527
902acc78
JB		 2528 if (beacon->tail)
2529 memcpy(skb_put(skb, beacon->tail_len),
2530 beacon->tail, beacon->tail_len);
9d139c81
JB		 2531 } else
2532 goto out;
05c914fe 2533 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 2534 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 2535 struct ieee80211_hdr *hdr;
c3ffeab4 2536 struct beacon_data *presp = rcu_dereference(ifibss->presp);
33b64eb2 2537
af8cdcd8 2538 if (!presp)
9d139c81
JB		 2539 goto out;
2540
cd7760e6
SW		 2541 if (sdata->vif.csa_active)
2542 ieee80211_update_csa(sdata, presp);
2543
2544
c3ffeab4 2545 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
9d139c81
JB		 2546 if (!skb)
2547 goto out;
c3ffeab4
JB		 2548 skb_reserve(skb, local->tx_headroom);
2549 memcpy(skb_put(skb, presp->head_len), presp->head,
2550 presp->head_len);
9d139c81
JB		 2551
2552 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 2553 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2554 IEEE80211_STYPE_BEACON);
902acc78 2555 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
dbf498fb 2556 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2b5e1967 2557 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
472dbc45 2558
2b5e1967 2559 if (!bcn)
ac1bd846 2560 goto out;
ac1bd846 2561
dbf498fb
JC		 2562 if (ifmsh->sync_ops)
2563 ifmsh->sync_ops->adjust_tbtt(
2564 sdata);
2565
3b69a9c5 2566 skb = dev_alloc_skb(local->tx_headroom +
2b5e1967 2567 bcn->head_len +
3f52b7e3 2568 256 + /* TIM IE */
2b5e1967 2569 bcn->tail_len);
902acc78
JB		 2570 if (!skb)
2571 goto out;
2b5e1967
TP		 2572 skb_reserve(skb, local->tx_headroom);
2573 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2574 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2575 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
9d139c81
JB		 2576 } else {
2577 WARN_ON(1);
5dfdaf58 2578 goto out;
e2ebc74d
JB		 2579 }
2580
4bf88530 2581 band = chanctx_conf->def.chan->band;
55de908a 2582
e039fa4a
JB		 2583 info = IEEE80211_SKB_CB(skb);
2584
3b8d81e0 2585 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 2586 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 2587 info->band = band;
e00cfce0
JM		 2588
2589 memset(&txrc, 0, sizeof(txrc));
2590 txrc.hw = hw;
e31583cd 2591 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 2592 txrc.bss_conf = &sdata->vif.bss_conf;
2593 txrc.skb = skb;
2594 txrc.reported_rate.idx = -1;
37eb0b16 2595 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 2596 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 2597 txrc.max_rate_idx = -1;
2598 else
2599 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
8f0729b1 2600 txrc.bss = true;
e00cfce0 2601 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 2602
2603 info->control.vif = vif;
f591fa5d 2604
a472e71b
JL		 2605 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2606 IEEE80211_TX_CTL_ASSIGN_SEQ |
2607 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 2608 out:
5dfdaf58 2609 rcu_read_unlock();
e2ebc74d
JB		 2610 return skb;
2611}
eddcbb94 2612EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 2613
02945821
AN		 2614struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2615 struct ieee80211_vif *vif)
2616{
2617 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 2618 struct sk_buff *skb = NULL;
2619 struct probe_resp *presp = NULL;
02945821
AN		 2620 struct ieee80211_hdr *hdr;
2621 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2622
2623 if (sdata->vif.type != NL80211_IFTYPE_AP)
2624 return NULL;
2625
2626 rcu_read_lock();
2627
2628 ap = &sdata->u.ap;
2629 presp = rcu_dereference(ap->probe_resp);
2630 if (!presp)
2631 goto out;
2632
aa7a0080 2633 skb = dev_alloc_skb(presp->len);
02945821
AN		 2634 if (!skb)
2635 goto out;
2636
aa7a0080
ES		 2637 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2638
02945821
AN		 2639 hdr = (struct ieee80211_hdr *) skb->data;
2640 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2641
2642out:
2643 rcu_read_unlock();
2644 return skb;
2645}
2646EXPORT_SYMBOL(ieee80211_proberesp_get);
2647
7044cc56
KV		 2648struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2649 struct ieee80211_vif *vif)
2650{
2651 struct ieee80211_sub_if_data *sdata;
2652 struct ieee80211_if_managed *ifmgd;
2653 struct ieee80211_pspoll *pspoll;
2654 struct ieee80211_local *local;
2655 struct sk_buff *skb;
2656
2657 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2658 return NULL;
2659
2660 sdata = vif_to_sdata(vif);
2661 ifmgd = &sdata->u.mgd;
2662 local = sdata->local;
2663
2664 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 2665 if (!skb)
7044cc56 2666 return NULL;
d15b8459 2667
7044cc56
KV		 2668 skb_reserve(skb, local->hw.extra_tx_headroom);
2669
2670 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2671 memset(pspoll, 0, sizeof(*pspoll));
2672 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2673 IEEE80211_STYPE_PSPOLL);
2674 pspoll->aid = cpu_to_le16(ifmgd->aid);
2675
2676 /* aid in PS-Poll has its two MSBs each set to 1 */
2677 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2678
2679 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2680 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2681
2682 return skb;
2683}
2684EXPORT_SYMBOL(ieee80211_pspoll_get);
2685
2686struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2687 struct ieee80211_vif *vif)
2688{
2689 struct ieee80211_hdr_3addr *nullfunc;
2690 struct ieee80211_sub_if_data *sdata;
2691 struct ieee80211_if_managed *ifmgd;
2692 struct ieee80211_local *local;
2693 struct sk_buff *skb;
2694
2695 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2696 return NULL;
2697
2698 sdata = vif_to_sdata(vif);
2699 ifmgd = &sdata->u.mgd;
2700 local = sdata->local;
2701
2702 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 2703 if (!skb)
7044cc56 2704 return NULL;
d15b8459 2705
7044cc56
KV		 2706 skb_reserve(skb, local->hw.extra_tx_headroom);
2707
2708 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2709 sizeof(*nullfunc));
2710 memset(nullfunc, 0, sizeof(*nullfunc));
2711 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2712 IEEE80211_STYPE_NULLFUNC |
2713 IEEE80211_FCTL_TODS);
2714 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2715 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2716 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2717
2718 return skb;
2719}
2720EXPORT_SYMBOL(ieee80211_nullfunc_get);
2721
05e54ea6
KV		 2722struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2723 struct ieee80211_vif *vif,
2724 const u8 *ssid, size_t ssid_len,
b9a9ada1 2725 size_t tailroom)
05e54ea6
KV		 2726{
2727 struct ieee80211_sub_if_data *sdata;
2728 struct ieee80211_local *local;
2729 struct ieee80211_hdr_3addr *hdr;
2730 struct sk_buff *skb;
2731 size_t ie_ssid_len;
2732 u8 *pos;
2733
2734 sdata = vif_to_sdata(vif);
2735 local = sdata->local;
2736 ie_ssid_len = 2 + ssid_len;
2737
2738 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
b9a9ada1 2739 ie_ssid_len + tailroom);
d15b8459 2740 if (!skb)
05e54ea6 2741 return NULL;
05e54ea6
KV		 2742
2743 skb_reserve(skb, local->hw.extra_tx_headroom);
2744
2745 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2746 memset(hdr, 0, sizeof(*hdr));
2747 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2748 IEEE80211_STYPE_PROBE_REQ);
e83e6541 2749 eth_broadcast_addr(hdr->addr1);
05e54ea6 2750 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
e83e6541 2751 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 2752
2753 pos = skb_put(skb, ie_ssid_len);
2754 *pos++ = WLAN_EID_SSID;
2755 *pos++ = ssid_len;
88c868c4 2756 if (ssid_len)
05e54ea6
KV		 2757 memcpy(pos, ssid, ssid_len);
2758 pos += ssid_len;
2759
05e54ea6
KV		 2760 return skb;
2761}
2762EXPORT_SYMBOL(ieee80211_probereq_get);
2763
32bfd35d 2764void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2765 const void *frame, size_t frame_len,
e039fa4a 2766 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2767 struct ieee80211_rts *rts)
2768{
2769 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2770
065e9605
HH		 2771 rts->frame_control =
2772 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 2773 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2774 frame_txctl);
e2ebc74d
JB		 2775 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2776 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2777}
2778EXPORT_SYMBOL(ieee80211_rts_get);
2779
32bfd35d 2780void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2781 const void *frame, size_t frame_len,
e039fa4a 2782 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2783 struct ieee80211_cts *cts)
2784{
2785 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2786
065e9605
HH		 2787 cts->frame_control =
2788 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 2789 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2790 frame_len, frame_txctl);
e2ebc74d
JB		 2791 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2792}
2793EXPORT_SYMBOL(ieee80211_ctstoself_get);
2794
2795struct sk_buff *
32bfd35d 2796ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 2797 struct ieee80211_vif *vif)
e2ebc74d
JB		 2798{
2799 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 2800 struct sk_buff *skb = NULL;
5cf121c3 2801 struct ieee80211_tx_data tx;
e2ebc74d 2802 struct ieee80211_sub_if_data *sdata;
d012a605 2803 struct ps_data *ps;
e039fa4a 2804 struct ieee80211_tx_info *info;
55de908a 2805 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 2806
32bfd35d 2807 sdata = vif_to_sdata(vif);
5dfdaf58 2808
5dfdaf58 2809 rcu_read_lock();
55de908a 2810 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 2811
d012a605
MP		 2812 if (!chanctx_conf)
2813 goto out;
2814
2815 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2816 struct beacon_data *beacon =
2817 rcu_dereference(sdata->u.ap.beacon);
2818
2819 if (!beacon || !beacon->head)
2820 goto out;
2821
2822 ps = &sdata->u.ap.ps;
3f52b7e3
MP		 2823 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2824 ps = &sdata->u.mesh.ps;
d012a605 2825 } else {
747cf5e9 2826 goto out;
d012a605 2827 }
5dfdaf58 2828
d012a605 2829 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
747cf5e9 2830 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 2831
e2ebc74d 2832 while (1) {
d012a605 2833 skb = skb_dequeue(&ps->bc_buf);
e2ebc74d 2834 if (!skb)
747cf5e9 2835 goto out;
e2ebc74d
JB		 2836 local->total_ps_buffered--;
2837
d012a605 2838 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
e2ebc74d
JB		 2839 struct ieee80211_hdr *hdr =
2840 (struct ieee80211_hdr *) skb->data;
2841 /* more buffered multicast/broadcast frames ==> set
2842 * MoreData flag in IEEE 802.11 header to inform PS
2843 * STAs */
2844 hdr->frame_control |=
2845 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2846 }
2847
7cbf9d01
MP		 2848 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2849 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3b8d81e0 2850 if (!ieee80211_tx_prepare(sdata, &tx, skb))
e2ebc74d
JB		 2851 break;
2852 dev_kfree_skb_any(skb);
2853 }
e039fa4a
JB		 2854
2855 info = IEEE80211_SKB_CB(skb);
2856
5cf121c3 2857 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4bf88530 2858 info->band = chanctx_conf->def.chan->band;
e2ebc74d 2859
97b045d6 2860 if (invoke_tx_handlers(&tx))
e2ebc74d 2861 skb = NULL;
97b045d6 2862 out:
d0709a65 2863 rcu_read_unlock();
e2ebc74d
JB		 2864
2865 return skb;
2866}
2867EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 2868
55de908a
JB		 2869void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2870 struct sk_buff *skb, int tid,
2871 enum ieee80211_band band)
3b8d81e0 2872{
353d09c6 2873 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 2874
3b8d81e0
JB		 2875 skb_set_mac_header(skb, 0);
2876 skb_set_network_header(skb, 0);
2877 skb_set_transport_header(skb, 0);
2878
3a25a8c8 2879 skb_set_queue_mapping(skb, ac);
cf6bb79a 2880 skb->priority = tid;
cf0277e7 2881
89afe614
JB		 2882 skb->dev = sdata->dev;
2883
3d34deb6
JB		 2884 /*
2885 * The other path calling ieee80211_xmit is from the tasklet,
2886 * and while we can handle concurrent transmissions locking
2887 * requirements are that we do not come into tx with bhs on.
2888 */
2889 local_bh_disable();
55de908a 2890 ieee80211_xmit(sdata, skb, band);
3d34deb6 2891 local_bh_enable();
3b8d81e0 2892}
Linux 6.x block layer and io_uring tree(s)