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Johannes Berge2ebc742007-07-27 15:43:22 +02001/*
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>
Johannes Bergd98ad832014-09-03 15:24:57 +03006 * Copyright 2013-2014 Intel Mobile Communications GmbH
Johannes Berge2ebc742007-07-27 15:43:22 +02007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 *
13 * Transmit and frame generation functions.
14 */
15
16#include <linux/kernel.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/etherdevice.h>
20#include <linux/bitmap.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040021#include <linux/rcupdate.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040022#include <linux/export.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070023#include <net/net_namespace.h>
Johannes Berge2ebc742007-07-27 15:43:22 +020024#include <net/ieee80211_radiotap.h>
25#include <net/cfg80211.h>
26#include <net/mac80211.h>
Michal Kazior5caa3282016-05-19 10:37:51 +020027#include <net/codel.h>
28#include <net/codel_impl.h>
Johannes Berge2ebc742007-07-27 15:43:22 +020029#include <asm/unaligned.h>
Michal Kaziorfa962b92016-05-19 10:37:49 +020030#include <net/fq_impl.h>
Johannes Berge2ebc742007-07-27 15:43:22 +020031
32#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020033#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040034#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010035#include "mesh.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020036#include "wep.h"
37#include "wpa.h"
38#include "wme.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040039#include "rate.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020040
Johannes Berge2ebc742007-07-27 15:43:22 +020041/* misc utils */
42
Johannes Berg5a490512015-04-22 17:10:38 +020043static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
44{
45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
46
47 u64_stats_update_begin(&tstats->syncp);
48 tstats->tx_packets++;
49 tstats->tx_bytes += len;
50 u64_stats_update_end(&tstats->syncp);
51}
52
Johannes Berg252b86c2011-11-16 15:28:55 +010053static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
54 struct sk_buff *skb, int group_addr,
Johannes Berg03f93c32008-06-25 14:36:27 +030055 int next_frag_len)
Johannes Berge2ebc742007-07-27 15:43:22 +020056{
Simon Wunderlich2103dec2013-07-08 16:55:53 +020057 int rate, mrate, erp, dur, i, shift = 0;
Johannes Berg2e92e6f2008-05-15 12:55:27 +020058 struct ieee80211_rate *txrate;
Johannes Berge2ebc742007-07-27 15:43:22 +020059 struct ieee80211_local *local = tx->local;
Johannes Berg8318d782008-01-24 19:38:38 +010060 struct ieee80211_supported_band *sband;
Harvey Harrison358c8d92008-07-15 18:44:13 -070061 struct ieee80211_hdr *hdr;
Johannes Berg252b86c2011-11-16 15:28:55 +010062 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Simon Wunderlich2103dec2013-07-08 16:55:53 +020063 struct ieee80211_chanctx_conf *chanctx_conf;
64 u32 rate_flags = 0;
65
66 rcu_read_lock();
67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
68 if (chanctx_conf) {
69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
71 }
72 rcu_read_unlock();
Johannes Berge6a98542008-10-21 12:40:02 +020073
74 /* assume HW handles this */
Felix Fietkau336004e2014-11-21 23:29:14 +010075 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
Johannes Berge6a98542008-10-21 12:40:02 +020076 return 0;
77
78 /* uh huh? */
Felix Fietkau0d528d82013-04-22 16:14:41 +020079 if (WARN_ON_ONCE(tx->rate.idx < 0))
Johannes Berge6a98542008-10-21 12:40:02 +020080 return 0;
Johannes Berge2ebc742007-07-27 15:43:22 +020081
Johannes Berg2d565772012-07-23 15:12:51 +020082 sband = local->hw.wiphy->bands[info->band];
Felix Fietkau0d528d82013-04-22 16:14:41 +020083 txrate = &sband->bitrates[tx->rate.idx];
Johannes Berg8318d782008-01-24 19:38:38 +010084
Johannes Berge6a98542008-10-21 12:40:02 +020085 erp = txrate->flags & IEEE80211_RATE_ERP_G;
Johannes Berge2ebc742007-07-27 15:43:22 +020086
87 /*
88 * data and mgmt (except PS Poll):
89 * - during CFP: 32768
90 * - during contention period:
91 * if addr1 is group address: 0
92 * if more fragments = 0 and addr1 is individual address: time to
93 * transmit one ACK plus SIFS
94 * if more fragments = 1 and addr1 is individual address: time to
95 * transmit next fragment plus 2 x ACK plus 3 x SIFS
96 *
97 * IEEE 802.11, 9.6:
98 * - control response frame (CTS or ACK) shall be transmitted using the
99 * same rate as the immediately previous frame in the frame exchange
100 * sequence, if this rate belongs to the PHY mandatory rates, or else
101 * at the highest possible rate belonging to the PHY rates in the
102 * BSSBasicRateSet
103 */
Johannes Berg252b86c2011-11-16 15:28:55 +0100104 hdr = (struct ieee80211_hdr *)skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -0700105 if (ieee80211_is_ctl(hdr->frame_control)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200106 /* TODO: These control frames are not currently sent by
Johannes Bergccd7b362008-09-11 00:01:56 +0200107 * mac80211, but should they be implemented, this function
Johannes Berge2ebc742007-07-27 15:43:22 +0200108 * needs to be updated to support duration field calculation.
109 *
110 * RTS: time needed to transmit pending data/mgmt frame plus
111 * one CTS frame plus one ACK frame plus 3 x SIFS
112 * CTS: duration of immediately previous RTS minus time
113 * required to transmit CTS and its SIFS
114 * ACK: 0 if immediately previous directed data/mgmt had
115 * more=0, with more=1 duration in ACK frame is duration
116 * from previous frame minus time needed to transmit ACK
117 * and its SIFS
118 * PS Poll: BIT(15) | BIT(14) | aid
119 */
120 return 0;
121 }
122
123 /* data/mgmt */
124 if (0 /* FIX: data/mgmt during CFP */)
Johannes Berg03f93c32008-06-25 14:36:27 +0300125 return cpu_to_le16(32768);
Johannes Berge2ebc742007-07-27 15:43:22 +0200126
127 if (group_addr) /* Group address as the destination - no ACK */
128 return 0;
129
130 /* Individual destination address:
131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132 * CTS and ACK frames shall be transmitted using the highest rate in
133 * basic rate set that is less than or equal to the rate of the
134 * immediately previous frame and that is using the same modulation
135 * (CCK or OFDM). If no basic rate set matches with these requirements,
136 * the highest mandatory rate of the PHY that is less than or equal to
137 * the rate of the previous frame is used.
138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
139 */
140 rate = -1;
Johannes Berg8318d782008-01-24 19:38:38 +0100141 /* use lowest available if everything fails */
142 mrate = sband->bitrates[0].bitrate;
143 for (i = 0; i < sband->n_bitrates; i++) {
144 struct ieee80211_rate *r = &sband->bitrates[i];
145
146 if (r->bitrate > txrate->bitrate)
Johannes Berge2ebc742007-07-27 15:43:22 +0200147 break;
148
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200149 if ((rate_flags & r->flags) != rate_flags)
150 continue;
151
Johannes Bergbda39332008-10-11 01:51:51 +0200152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
Johannes Berge2ebc742007-07-27 15:43:22 +0200154
Johannes Berg8318d782008-01-24 19:38:38 +0100155 switch (sband->band) {
Johannes Berg57fbcce2016-04-12 15:56:15 +0200156 case NL80211_BAND_2GHZ: {
Johannes Berg8318d782008-01-24 19:38:38 +0100157 u32 flag;
158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
159 flag = IEEE80211_RATE_MANDATORY_G;
160 else
161 flag = IEEE80211_RATE_MANDATORY_B;
162 if (r->flags & flag)
163 mrate = r->bitrate;
164 break;
165 }
Johannes Berg57fbcce2016-04-12 15:56:15 +0200166 case NL80211_BAND_5GHZ:
Johannes Berg8318d782008-01-24 19:38:38 +0100167 if (r->flags & IEEE80211_RATE_MANDATORY_A)
168 mrate = r->bitrate;
169 break;
Johannes Berg57fbcce2016-04-12 15:56:15 +0200170 case NL80211_BAND_60GHZ:
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +0300171 /* TODO, for now fall through */
Johannes Berg57fbcce2016-04-12 15:56:15 +0200172 case NUM_NL80211_BANDS:
Johannes Berg8318d782008-01-24 19:38:38 +0100173 WARN_ON(1);
174 break;
175 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200176 }
177 if (rate == -1) {
178 /* No matching basic rate found; use highest suitable mandatory
179 * PHY rate */
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200180 rate = DIV_ROUND_UP(mrate, 1 << shift);
Johannes Berge2ebc742007-07-27 15:43:22 +0200181 }
182
Simon Wunderlich6674f212011-11-21 21:34:30 +0100183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184 if (ieee80211_is_data_qos(hdr->frame_control) &&
Claudio Pisac26a0e12012-05-28 13:06:25 +0100185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
Simon Wunderlich6674f212011-11-21 21:34:30 +0100186 dur = 0;
187 else
188 /* Time needed to transmit ACK
189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190 * to closest integer */
Michal Kazior4ee73f32012-04-11 08:47:56 +0200191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
Simon Wunderlich438b61b2013-07-08 16:55:51 +0200192 tx->sdata->vif.bss_conf.use_short_preamble,
193 shift);
Johannes Berge2ebc742007-07-27 15:43:22 +0200194
195 if (next_frag_len) {
196 /* Frame is fragmented: duration increases with time needed to
197 * transmit next fragment plus ACK and 2 x SIFS. */
198 dur *= 2; /* ACK + SIFS */
199 /* next fragment */
Michal Kazior4ee73f32012-04-11 08:47:56 +0200200 dur += ieee80211_frame_duration(sband->band, next_frag_len,
Johannes Berg8318d782008-01-24 19:38:38 +0100201 txrate->bitrate, erp,
Simon Wunderlich438b61b2013-07-08 16:55:51 +0200202 tx->sdata->vif.bss_conf.use_short_preamble,
203 shift);
Johannes Berge2ebc742007-07-27 15:43:22 +0200204 }
205
Johannes Berg03f93c32008-06-25 14:36:27 +0300206 return cpu_to_le16(dur);
Johannes Berge2ebc742007-07-27 15:43:22 +0200207}
208
Johannes Berge2ebc742007-07-27 15:43:22 +0200209/* tx handlers */
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200210static ieee80211_tx_result debug_noinline
211ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
212{
213 struct ieee80211_local *local = tx->local;
Kalle Valo0c742112010-01-12 10:42:53 +0200214 struct ieee80211_if_managed *ifmgd;
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200215
216 /* driver doesn't support power save */
Johannes Berg30686bf2015-06-02 21:39:54 +0200217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200218 return TX_CONTINUE;
219
220 /* hardware does dynamic power save */
Johannes Berg30686bf2015-06-02 21:39:54 +0200221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200222 return TX_CONTINUE;
223
224 /* dynamic power save disabled */
225 if (local->hw.conf.dynamic_ps_timeout <= 0)
226 return TX_CONTINUE;
227
228 /* we are scanning, don't enable power save */
229 if (local->scanning)
230 return TX_CONTINUE;
231
232 if (!local->ps_sdata)
233 return TX_CONTINUE;
234
235 /* No point if we're going to suspend */
236 if (local->quiescing)
237 return TX_CONTINUE;
238
Kalle Valo0c742112010-01-12 10:42:53 +0200239 /* dynamic ps is supported only in managed mode */
240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
241 return TX_CONTINUE;
242
243 ifmgd = &tx->sdata->u.mgd;
244
245 /*
246 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 * u-apsd enabled and the frame is in voip class. This effectively
248 * means that even if all access categories have u-apsd enabled, in
249 * practise u-apsd is only used with the voip ac. This is a
250 * workaround for the case when received voip class packets do not
251 * have correct qos tag for some reason, due the network or the
252 * peer application.
253 *
Eliad Pellerdc41e4d2012-03-14 16:15:03 +0200254 * Note: ifmgd->uapsd_queues access is racy here. If the value is
Kalle Valo0c742112010-01-12 10:42:53 +0200255 * changed via debugfs, user needs to reassociate manually to have
256 * everything in sync.
257 */
Johannes Berg4875d30d2012-03-27 14:18:37 +0200258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
Kalle Valo0c742112010-01-12 10:42:53 +0200261 return TX_CONTINUE;
262
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200263 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264 ieee80211_stop_queues_by_reason(&local->hw,
Johannes Berg445ea4e2013-02-13 12:25:28 +0100265 IEEE80211_MAX_QUEUE_MAP,
Luciano Coelhocca07b02014-06-13 16:30:05 +0300266 IEEE80211_QUEUE_STOP_REASON_PS,
267 false);
Vivek Natarajandb285692011-02-18 17:18:03 +0530268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200269 ieee80211_queue_work(&local->hw,
270 &local->dynamic_ps_disable_work);
271 }
272
Luciano Coelho5db1c072011-05-03 21:40:08 +0300273 /* Don't restart the timer if we're not disassociated */
274 if (!ifmgd->associated)
275 return TX_CONTINUE;
276
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200277 mod_timer(&local->dynamic_ps_timer, jiffies +
278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
279
280 return TX_CONTINUE;
281}
Johannes Berge2ebc742007-07-27 15:43:22 +0200282
Johannes Bergd9e8a702008-06-30 15:10:44 +0200283static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100284ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200285{
Harvey Harrison358c8d92008-07-15 18:44:13 -0700286
Johannes Berge039fa42008-05-15 12:55:29 +0200287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berge039fa42008-05-15 12:55:29 +0200288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200289 bool assoc = false;
Johannes Berge2ebc742007-07-27 15:43:22 +0200290
Johannes Berge039fa42008-05-15 12:55:29 +0200291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100292 return TX_CONTINUE;
Johannes Berg58d41852007-09-26 17:53:18 +0200293
Ben Greearb23b0252011-02-04 11:54:17 -0800294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
Kalle Valoa9a6fff2009-03-18 14:06:44 +0200296 !ieee80211_is_probe_req(hdr->frame_control) &&
297 !ieee80211_is_nullfunc(hdr->frame_control))
298 /*
299 * When software scanning only nullfunc frames (to notify
300 * the sleep state to the AP) and probe requests (for the
301 * active scan) are allowed, all other frames should not be
302 * sent and we should not get here, but if we do
303 * nonetheless, drop them to avoid sending them
304 * off-channel. See the link below and
305 * ieee80211_start_scan() for more.
306 *
307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100309 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200310
Rostislav Lisovy239281f2014-11-03 10:33:19 +0100311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
312 return TX_CONTINUE;
313
Bill Jordan1be7fe82010-10-01 11:20:41 -0400314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
315 return TX_CONTINUE;
316
Johannes Berg5cf121c2008-02-25 16:27:43 +0100317 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100318 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200319
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200320 if (tx->sta)
321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
Johannes Berge2ebc742007-07-27 15:43:22 +0200322
Johannes Berg5cf121c2008-02-25 16:27:43 +0100323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200324 if (unlikely(!assoc &&
Harvey Harrison358c8d92008-07-15 18:44:13 -0700325 ieee80211_is_data(hdr->frame_control))) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200326#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200327 sdata_info(tx->sdata,
328 "dropped data frame to not associated station %pM\n",
329 hdr->addr1);
330#endif
Johannes Berge2ebc742007-07-27 15:43:22 +0200331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100332 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200333 }
Johannes Berg29623892011-12-14 12:20:31 +0100334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
335 ieee80211_is_data(hdr->frame_control) &&
Felix Fietkau030ef8f2012-04-23 19:49:02 +0200336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
Johannes Berg29623892011-12-14 12:20:31 +0100337 /*
338 * No associated STAs - no need to send multicast
339 * frames.
340 */
341 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200342 }
343
Johannes Berg9ae54c82008-01-31 19:48:20 +0100344 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200345}
346
Johannes Berge2ebc742007-07-27 15:43:22 +0200347/* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351static void purge_old_ps_buffers(struct ieee80211_local *local)
352{
353 int total = 0, purged = 0;
354 struct sk_buff *skb;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
357
Johannes Berg79010422007-09-18 17:29:21 -0400358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Marco Porschd012a602012-10-10 12:39:50 -0700359 struct ps_data *ps;
360
361 if (sdata->vif.type == NL80211_IFTYPE_AP)
362 ps = &sdata->u.ap.ps;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100363 else if (ieee80211_vif_is_mesh(&sdata->vif))
364 ps = &sdata->u.mesh.ps;
Marco Porschd012a602012-10-10 12:39:50 -0700365 else
Johannes Berge2ebc742007-07-27 15:43:22 +0200366 continue;
Marco Porschd012a602012-10-10 12:39:50 -0700367
368 skb = skb_dequeue(&ps->bc_buf);
Johannes Berge2ebc742007-07-27 15:43:22 +0200369 if (skb) {
370 purged++;
Felix Fietkau6b07d9c2016-08-02 11:13:41 +0200371 ieee80211_free_txskb(&local->hw, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +0200372 }
Marco Porschd012a602012-10-10 12:39:50 -0700373 total += skb_queue_len(&ps->bc_buf);
Johannes Berge2ebc742007-07-27 15:43:22 +0200374 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200375
Johannes Berg948d8872011-09-29 16:04:29 +0200376 /*
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
379 */
Johannes Bergd0709a62008-02-25 16:27:46 +0100380 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Berg948d8872011-09-29 16:04:29 +0200381 int ac;
382
383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
384 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
385 total += skb_queue_len(&sta->ps_tx_buf[ac]);
386 if (skb) {
387 purged++;
Felix Fietkauc3e77242012-10-08 14:39:33 +0200388 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg948d8872011-09-29 16:04:29 +0200389 break;
390 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200391 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200392 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100393
Johannes Berge2ebc742007-07-27 15:43:22 +0200394 local->total_ps_buffered = total;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
Johannes Berge2ebc742007-07-27 15:43:22 +0200396}
397
Johannes Berg9ae54c82008-01-31 19:48:20 +0100398static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100399ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200400{
Johannes Berge039fa42008-05-15 12:55:29 +0200401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Marco Porschd012a602012-10-10 12:39:50 -0700403 struct ps_data *ps;
Johannes Berge039fa42008-05-15 12:55:29 +0200404
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100405 /*
406 * broadcast/multicast frame
407 *
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100408 * If any of the associated/peer stations is in power save mode,
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
411 */
412
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
Marco Porschd012a602012-10-10 12:39:50 -0700414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 if (!tx->sdata->bss)
417 return TX_CONTINUE;
418
419 ps = &tx->sdata->bss->ps;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 ps = &tx->sdata->u.mesh.ps;
Marco Porschd012a602012-10-10 12:39:50 -0700422 } else {
Johannes Berg3e122be2008-07-09 14:40:34 +0200423 return TX_CONTINUE;
Marco Porschd012a602012-10-10 12:39:50 -0700424 }
425
Johannes Berg3e122be2008-07-09 14:40:34 +0200426
427 /* no buffering for ordered frames */
Harvey Harrison358c8d92008-07-15 18:44:13 -0700428 if (ieee80211_has_order(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100429 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100430
Johannes Berg08b99392014-07-07 12:01:11 +0200431 if (ieee80211_is_probe_req(hdr->frame_control))
432 return TX_CONTINUE;
433
Johannes Berg30686bf2015-06-02 21:39:54 +0200434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
Johannes Bergf4d57942013-05-28 17:24:15 +0200435 info->hw_queue = tx->sdata->vif.cab_queue;
436
Felix Fietkaudb32c242018-11-28 22:39:16 +0100437 /* no stations in PS mode and no buffered packets */
438 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100439 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100440
Johannes Berg62b517c2009-10-29 12:19:21 +0100441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
Johannes Berg62b12082009-08-10 16:04:15 +0200442
Johannes Berg62b517c2009-10-29 12:19:21 +0100443 /* device releases frame after DTIM beacon */
Johannes Berg30686bf2015-06-02 21:39:54 +0200444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
Johannes Berg62b12082009-08-10 16:04:15 +0200445 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200446
Johannes Berg62b12082009-08-10 16:04:15 +0200447 /* buffered in mac80211 */
448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 purge_old_ps_buffers(tx->local);
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100450
Marco Porschd012a602012-10-10 12:39:50 -0700451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200452 ps_dbg(tx->sdata,
453 "BC TX buffer full - dropping the oldest frame\n");
Felix Fietkau6b07d9c2016-08-02 11:13:41 +0200454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
Johannes Berg62b12082009-08-10 16:04:15 +0200455 } else
456 tx->local->total_ps_buffered++;
457
Marco Porschd012a602012-10-10 12:39:50 -0700458 skb_queue_tail(&ps->bc_buf, tx->skb);
Johannes Berg62b12082009-08-10 16:04:15 +0200459
460 return TX_QUEUED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200461}
462
Jouni Malinenfb733332009-01-08 13:32:00 +0200463static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
464 struct sk_buff *skb)
465{
466 if (!ieee80211_is_mgmt(fc))
467 return 0;
468
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
Jouni Malinenfb733332009-01-08 13:32:00 +0200470 return 0;
471
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100472 if (!ieee80211_is_robust_mgmt_frame(skb))
Jouni Malinenfb733332009-01-08 13:32:00 +0200473 return 0;
474
475 return 1;
476}
477
Johannes Berg9ae54c82008-01-31 19:48:20 +0100478static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100479ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200480{
481 struct sta_info *sta = tx->sta;
Johannes Berge039fa42008-05-15 12:55:29 +0200482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berg08b99392014-07-07 12:01:11 +0200483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300484 struct ieee80211_local *local = tx->local;
Johannes Berge2ebc742007-07-27 15:43:22 +0200485
Johannes Berg02f2f1a2012-02-27 12:18:30 +0100486 if (unlikely(!sta))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100487 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200488
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
Johannes Berg5ac2e352014-05-27 16:32:27 +0200490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
Johannes Berg02f2f1a2012-02-27 12:18:30 +0100492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
Johannes Berg948d8872011-09-29 16:04:29 +0200493 int ac = skb_get_queue_mapping(tx->skb);
494
Johannes Berg08b99392014-07-07 12:01:11 +0200495 if (ieee80211_is_mgmt(hdr->frame_control) &&
496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 return TX_CONTINUE;
499 }
500
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta->sta.addr, sta->sta.aid, ac);
Johannes Berge2ebc742007-07-27 15:43:22 +0200503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
504 purge_old_ps_buffers(tx->local);
Emmanuel Grumbach1d147bf2014-02-20 09:22:11 +0200505
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta->ps_lock);
508 /*
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
512 */
513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
Johannes Berg5ac2e352014-05-27 16:32:27 +0200514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
Emmanuel Grumbach1d147bf2014-02-20 09:22:11 +0200516 spin_unlock(&sta->ps_lock);
517 return TX_CONTINUE;
518 }
519
Johannes Berg948d8872011-09-29 16:04:29 +0200520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200522 ps_dbg(tx->sdata,
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
524 sta->sta.addr, ac);
Felix Fietkauc3e77242012-10-08 14:39:33 +0200525 ieee80211_free_txskb(&local->hw, old);
Johannes Berge2ebc742007-07-27 15:43:22 +0200526 } else
527 tx->local->total_ps_buffered++;
Johannes Berg004c8722008-02-20 11:21:35 +0100528
Johannes Berge039fa42008-05-15 12:55:29 +0200529 info->control.jiffies = jiffies;
Johannes Berg5061b0c2009-07-14 00:33:34 +0200530 info->control.vif = &tx->sdata->vif;
Johannes Berg8f77f382009-06-07 21:58:37 +0200531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg03c8c062014-01-09 01:45:28 +0100532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
Johannes Berg948d8872011-09-29 16:04:29 +0200533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
Emmanuel Grumbach1d147bf2014-02-20 09:22:11 +0200534 spin_unlock(&sta->ps_lock);
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300535
536 if (!timer_pending(&local->sta_cleanup))
537 mod_timer(&local->sta_cleanup,
538 round_jiffies(jiffies +
539 STA_INFO_CLEANUP_INTERVAL));
540
Johannes Bergc868cb352011-09-29 16:04:27 +0200541 /*
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
544 */
545 sta_info_recalc_tim(sta);
546
Johannes Berg9ae54c82008-01-31 19:48:20 +0100547 return TX_QUEUED;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
549 ps_dbg(tx->sdata,
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
551 sta->sta.addr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200552 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200553
Johannes Berg9ae54c82008-01-31 19:48:20 +0100554 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200555}
556
Johannes Bergd9e8a702008-06-30 15:10:44 +0200557static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100558ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200559{
Johannes Berg5cf121c2008-02-25 16:27:43 +0100560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100561 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200562
Johannes Berg5cf121c2008-02-25 16:27:43 +0100563 if (tx->flags & IEEE80211_TX_UNICAST)
Johannes Berge2ebc742007-07-27 15:43:22 +0200564 return ieee80211_tx_h_unicast_ps_buf(tx);
565 else
566 return ieee80211_tx_h_multicast_ps_buf(tx);
567}
568
Johannes Bergd9e8a702008-06-30 15:10:44 +0200569static ieee80211_tx_result debug_noinline
Johannes Berga621fa42010-08-27 14:26:54 +0300570ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
571{
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
573
Johannes Bergaf61a162013-07-02 18:09:12 +0200574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
575 if (tx->sdata->control_port_no_encrypt)
576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
Jouni Malinen9c1c98a2015-02-26 15:50:50 +0200578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
Johannes Bergaf61a162013-07-02 18:09:12 +0200579 }
Johannes Berga621fa42010-08-27 14:26:54 +0300580
581 return TX_CONTINUE;
582}
583
584static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100585ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200586{
Johannes Berg46e6de12012-07-04 18:10:07 +0200587 struct ieee80211_key *key;
Johannes Berge039fa42008-05-15 12:55:29 +0200588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400590
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
Johannes Berge2ebc742007-07-27 15:43:22 +0200592 tx->key = NULL;
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200593 else if (tx->sta &&
594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
Johannes Bergd4e46a32007-09-14 11:10:24 -0400595 tx->key = key;
Masashi Honma46f6b062016-06-22 19:55:20 +0900596 else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 (key = rcu_dereference(tx->sdata->default_multicast_key)))
598 tx->key = key;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200599 else if (ieee80211_is_mgmt(hdr->frame_control) &&
Jouni Malinenecbcd322010-03-29 23:35:23 -0700600 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100601 ieee80211_is_robust_mgmt_frame(tx->skb) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200602 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
603 tx->key = key;
Johannes Bergf7e01042010-12-09 19:49:02 +0100604 else if (is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
606 tx->key = key;
607 else if (!is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_unicast_key)))
Johannes Bergd4e46a32007-09-14 11:10:24 -0400609 tx->key = key;
Johannes Berge8f4fb72015-03-20 11:37:36 +0100610 else
Johannes Berg46e6de12012-07-04 18:10:07 +0200611 tx->key = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +0200612
613 if (tx->key) {
Johannes Berg813d7662010-01-17 01:47:58 +0100614 bool skip_hw = false;
615
Johannes Berg011bfcc2007-09-17 01:29:25 -0400616 /* TODO: add threshold stuff again */
Johannes Berg176e4f82007-12-18 15:27:47 +0100617
Johannes Berg97359d12010-08-10 09:46:38 +0200618 switch (tx->key->conf.cipher) {
619 case WLAN_CIPHER_SUITE_WEP40:
620 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berg97359d12010-08-10 09:46:38 +0200621 case WLAN_CIPHER_SUITE_TKIP:
Harvey Harrison358c8d92008-07-15 18:44:13 -0700622 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg176e4f82007-12-18 15:27:47 +0100623 tx->key = NULL;
624 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200625 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +0200626 case WLAN_CIPHER_SUITE_CCMP_256:
Jouni Malinen00b9cfa2015-01-24 19:52:06 +0200627 case WLAN_CIPHER_SUITE_GCMP:
628 case WLAN_CIPHER_SUITE_GCMP_256:
Jouni Malinenfb733332009-01-08 13:32:00 +0200629 if (!ieee80211_is_data_present(hdr->frame_control) &&
630 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
Masashi Honma46f6b062016-06-22 19:55:20 +0900631 tx->skb) &&
632 !ieee80211_is_group_privacy_action(tx->skb))
Jouni Malinenfb733332009-01-08 13:32:00 +0200633 tx->key = NULL;
Kalle Valo3b43a182010-01-23 20:27:14 +0200634 else
635 skip_hw = (tx->key->conf.flags &
Johannes Berge548c492012-09-04 17:08:23 +0200636 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
Kalle Valo3b43a182010-01-23 20:27:14 +0200637 ieee80211_is_mgmt(hdr->frame_control);
Jouni Malinenfb733332009-01-08 13:32:00 +0200638 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200639 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen56c52da2015-01-24 19:52:08 +0200640 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
Jouni Malinen8ade5382015-01-24 19:52:09 +0200641 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200643 if (!ieee80211_is_mgmt(hdr->frame_control))
644 tx->key = NULL;
645 break;
Johannes Berg176e4f82007-12-18 15:27:47 +0100646 }
Johannes Berg813d7662010-01-17 01:47:58 +0100647
Johannes Berge54faf22013-01-29 11:41:38 +0100648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 !ieee80211_is_deauth(hdr->frame_control)))
Johannes Berg95acac62011-07-12 12:30:59 +0200650 return TX_DROP;
651
Johannes Bergf12553e2010-01-22 22:07:59 +0100652 if (!skip_hw && tx->key &&
Johannes Berg382b1652010-01-25 11:36:16 +0100653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
Johannes Berg813d7662010-01-17 01:47:58 +0100654 info->control.hw_key = &tx->key->conf;
Johannes Berge2ebc742007-07-27 15:43:22 +0200655 }
656
Johannes Berg9ae54c82008-01-31 19:48:20 +0100657 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200658}
659
Johannes Bergd9e8a702008-06-30 15:10:44 +0200660static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100661ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200662{
Johannes Berge039fa42008-05-15 12:55:29 +0200663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200664 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
665 struct ieee80211_supported_band *sband;
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700666 u32 len;
Johannes Berge6a98542008-10-21 12:40:02 +0200667 struct ieee80211_tx_rate_control txrc;
Felix Fietkau0d528d82013-04-22 16:14:41 +0200668 struct ieee80211_sta_rates *ratetbl = NULL;
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200669 bool assoc = false;
Johannes Berge6a98542008-10-21 12:40:02 +0200670
671 memset(&txrc, 0, sizeof(txrc));
Johannes Berg8318d782008-01-24 19:38:38 +0100672
Johannes Berg2d565772012-07-23 15:12:51 +0200673 sband = tx->local->hw.wiphy->bands[info->band];
Johannes Berge2ebc742007-07-27 15:43:22 +0200674
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700675 len = min_t(u32, tx->skb->len + FCS_LEN,
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200676 tx->local->hw.wiphy->frag_threshold);
Johannes Berg58d41852007-09-26 17:53:18 +0200677
Johannes Berge6a98542008-10-21 12:40:02 +0200678 /* set up the tx rate control struct we give the RC algo */
Johannes Berg005e4722012-02-26 11:24:35 +0100679 txrc.hw = &tx->local->hw;
Johannes Berge6a98542008-10-21 12:40:02 +0200680 txrc.sband = sband;
681 txrc.bss_conf = &tx->sdata->vif.bss_conf;
682 txrc.skb = tx->skb;
683 txrc.reported_rate.idx = -1;
Johannes Berg2d565772012-07-23 15:12:51 +0200684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200685 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
686 txrc.max_rate_idx = -1;
687 else
688 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Felix Fietkau2ffbe6d2013-04-16 13:38:42 +0200689
690 if (tx->sdata->rc_has_mcs_mask[info->band])
691 txrc.rate_idx_mcs_mask =
692 tx->sdata->rc_rateidx_mcs_mask[info->band];
693
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100694 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
Chun-Yeow Yeoh4bb62342011-11-24 17:15:20 -0800695 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
Bertold Van den Bergh5765f9f2015-08-05 16:02:28 +0200696 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
697 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
Johannes Berg58d41852007-09-26 17:53:18 +0200698
Johannes Berge6a98542008-10-21 12:40:02 +0200699 /* set up RTS protection if desired */
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200700 if (len > tx->local->hw.wiphy->rts_threshold) {
Felix Fietkau0d528d82013-04-22 16:14:41 +0200701 txrc.rts = true;
Johannes Berge2ebc742007-07-27 15:43:22 +0200702 }
Johannes Berge6a98542008-10-21 12:40:02 +0200703
Felix Fietkau0d528d82013-04-22 16:14:41 +0200704 info->control.use_rts = txrc.rts;
Felix Fietkau991fec02013-04-16 13:38:43 +0200705 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
706
Johannes Berge6a98542008-10-21 12:40:02 +0200707 /*
708 * Use short preamble if the BSS can handle it, but not for
709 * management frames unless we know the receiver can handle
710 * that -- the management frame might be to a station that
711 * just wants a probe response.
712 */
713 if (tx->sdata->vif.bss_conf.use_short_preamble &&
714 (ieee80211_is_data(hdr->frame_control) ||
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200715 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
Felix Fietkau0d528d82013-04-22 16:14:41 +0200716 txrc.short_preamble = true;
717
718 info->control.short_preamble = txrc.short_preamble;
Johannes Berge6a98542008-10-21 12:40:02 +0200719
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +0100720 /* don't ask rate control when rate already injected via radiotap */
721 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
722 return TX_CONTINUE;
723
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200724 if (tx->sta)
725 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
Johannes Berge6a98542008-10-21 12:40:02 +0200726
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700727 /*
728 * Lets not bother rate control if we're associated and cannot
729 * talk to the sta. This should not happen.
730 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200731 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700732 !rate_usable_index_exists(sband, &tx->sta->sta),
733 "%s: Dropped data frame as no usable bitrate found while "
734 "scanning and associated. Target station: "
735 "%pM on %d GHz band\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100736 tx->sdata->name, hdr->addr1,
Johannes Berg2d565772012-07-23 15:12:51 +0200737 info->band ? 5 : 2))
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700738 return TX_DROP;
739
740 /*
741 * If we're associated with the sta at this point we know we can at
742 * least send the frame at the lowest bit rate.
743 */
Johannes Berge6a98542008-10-21 12:40:02 +0200744 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
745
Felix Fietkau0d528d82013-04-22 16:14:41 +0200746 if (tx->sta && !info->control.skip_table)
747 ratetbl = rcu_dereference(tx->sta->sta.rates);
748
749 if (unlikely(info->control.rates[0].idx < 0)) {
750 if (ratetbl) {
751 struct ieee80211_tx_rate rate = {
752 .idx = ratetbl->rate[0].idx,
753 .flags = ratetbl->rate[0].flags,
754 .count = ratetbl->rate[0].count
755 };
756
757 if (ratetbl->rate[0].idx < 0)
758 return TX_DROP;
759
760 tx->rate = rate;
761 } else {
762 return TX_DROP;
763 }
764 } else {
765 tx->rate = info->control.rates[0];
766 }
Johannes Berge6a98542008-10-21 12:40:02 +0200767
Helmut Schaac1ce5a72010-12-01 16:34:45 +0100768 if (txrc.reported_rate.idx < 0) {
Felix Fietkau0d528d82013-04-22 16:14:41 +0200769 txrc.reported_rate = tx->rate;
Helmut Schaac1ce5a72010-12-01 16:34:45 +0100770 if (tx->sta && ieee80211_is_data(hdr->frame_control))
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200771 tx->sta->tx_stats.last_rate = txrc.reported_rate;
Helmut Schaac1ce5a72010-12-01 16:34:45 +0100772 } else if (tx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200773 tx->sta->tx_stats.last_rate = txrc.reported_rate;
Johannes Berge6a98542008-10-21 12:40:02 +0200774
Felix Fietkau0d528d82013-04-22 16:14:41 +0200775 if (ratetbl)
776 return TX_CONTINUE;
777
Johannes Berge6a98542008-10-21 12:40:02 +0200778 if (unlikely(!info->control.rates[0].count))
779 info->control.rates[0].count = 1;
780
Gábor Stefanik99551512009-04-23 19:36:14 +0200781 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
782 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
783 info->control.rates[0].count = 1;
784
Johannes Berg9ae54c82008-01-31 19:48:20 +0100785 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200786}
787
Felix Fietkauba8c3d62015-03-27 21:30:37 +0100788static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
789{
790 u16 *seq = &sta->tid_seq[tid];
791 __le16 ret = cpu_to_le16(*seq);
792
793 /* Increase the sequence number. */
794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
795
796 return ret;
797}
798
Johannes Bergd9e8a702008-06-30 15:10:44 +0200799static ieee80211_tx_result debug_noinline
Johannes Bergf591fa52008-07-10 11:21:26 +0200800ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
801{
802 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
803 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Bergf591fa52008-07-10 11:21:26 +0200804 u8 *qc;
805 int tid;
806
Johannes Berg25d834e2008-09-12 22:52:47 +0200807 /*
808 * Packet injection may want to control the sequence
809 * number, if we have no matching interface then we
810 * neither assign one ourselves nor ask the driver to.
811 */
Johannes Berg5061b0c2009-07-14 00:33:34 +0200812 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
Johannes Berg25d834e2008-09-12 22:52:47 +0200813 return TX_CONTINUE;
814
Johannes Bergf591fa52008-07-10 11:21:26 +0200815 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
816 return TX_CONTINUE;
817
818 if (ieee80211_hdrlen(hdr->frame_control) < 24)
819 return TX_CONTINUE;
820
Johannes Berg49a59542011-09-29 16:04:41 +0200821 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
822 return TX_CONTINUE;
823
Johannes Berg94778282008-10-10 13:21:59 +0200824 /*
825 * Anything but QoS data that has a sequence number field
826 * (is long enough) gets a sequence number from the global
Bob Copelandc4c205f2013-08-23 09:35:38 -0400827 * counter. QoS data frames with a multicast destination
828 * also use the global counter (802.11-2012 9.3.2.10).
Johannes Berg94778282008-10-10 13:21:59 +0200829 */
Bob Copelandc4c205f2013-08-23 09:35:38 -0400830 if (!ieee80211_is_data_qos(hdr->frame_control) ||
831 is_multicast_ether_addr(hdr->addr1)) {
Johannes Berg94778282008-10-10 13:21:59 +0200832 /* driver should assign sequence number */
Johannes Bergf591fa52008-07-10 11:21:26 +0200833 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
Johannes Berg94778282008-10-10 13:21:59 +0200834 /* for pure STA mode without beacons, we can do it */
835 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
836 tx->sdata->sequence_number += 0x10;
Johannes Berg79c892b2014-11-21 14:26:31 +0100837 if (tx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200838 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
Johannes Bergf591fa52008-07-10 11:21:26 +0200839 return TX_CONTINUE;
840 }
841
842 /*
843 * This should be true for injected/management frames only, for
844 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
845 * above since they are not QoS-data frames.
846 */
847 if (!tx->sta)
848 return TX_CONTINUE;
849
850 /* include per-STA, per-TID sequence counter */
851
852 qc = ieee80211_get_qos_ctl(hdr);
853 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200854 tx->sta->tx_stats.msdu[tid]++;
Johannes Bergf591fa52008-07-10 11:21:26 +0200855
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +0200856 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
Johannes Bergf591fa52008-07-10 11:21:26 +0200857
858 return TX_CONTINUE;
859}
860
Johannes Berg252b86c2011-11-16 15:28:55 +0100861static int ieee80211_fragment(struct ieee80211_tx_data *tx,
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100862 struct sk_buff *skb, int hdrlen,
863 int frag_threshold)
864{
Johannes Berg252b86c2011-11-16 15:28:55 +0100865 struct ieee80211_local *local = tx->local;
Johannes Berga1a3fce2011-11-16 15:28:56 +0100866 struct ieee80211_tx_info *info;
Johannes Berg252b86c2011-11-16 15:28:55 +0100867 struct sk_buff *tmp;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100868 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
869 int pos = hdrlen + per_fragm;
870 int rem = skb->len - hdrlen - per_fragm;
871
872 if (WARN_ON(rem < 0))
873 return -EINVAL;
874
Johannes Berg252b86c2011-11-16 15:28:55 +0100875 /* first fragment was already added to queue by caller */
876
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100877 while (rem) {
878 int fraglen = per_fragm;
879
880 if (fraglen > rem)
881 fraglen = rem;
882 rem -= fraglen;
883 tmp = dev_alloc_skb(local->tx_headroom +
884 frag_threshold +
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200885 tx->sdata->encrypt_headroom +
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100886 IEEE80211_ENCRYPT_TAILROOM);
887 if (!tmp)
888 return -ENOMEM;
Johannes Berg252b86c2011-11-16 15:28:55 +0100889
890 __skb_queue_tail(&tx->skbs, tmp);
891
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200892 skb_reserve(tmp,
893 local->tx_headroom + tx->sdata->encrypt_headroom);
894
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100895 /* copy control information */
896 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
Johannes Berga1a3fce2011-11-16 15:28:56 +0100897
898 info = IEEE80211_SKB_CB(tmp);
899 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
900 IEEE80211_TX_CTL_FIRST_FRAGMENT);
901
902 if (rem)
903 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
904
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100905 skb_copy_queue_mapping(tmp, skb);
906 tmp->priority = skb->priority;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100907 tmp->dev = skb->dev;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100908
909 /* copy header and data */
910 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
911 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
912
913 pos += fraglen;
914 }
915
Johannes Berg252b86c2011-11-16 15:28:55 +0100916 /* adjust first fragment's length */
Johannes Berg338f9772014-02-01 00:16:23 +0100917 skb_trim(skb, hdrlen + per_fragm);
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100918 return 0;
919}
920
Johannes Bergf591fa52008-07-10 11:21:26 +0200921static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200922ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
923{
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100924 struct sk_buff *skb = tx->skb;
925 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
926 struct ieee80211_hdr *hdr = (void *)skb->data;
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200927 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100928 int hdrlen;
929 int fragnum;
Johannes Berge2454942008-05-15 12:55:28 +0200930
Johannes Berg252b86c2011-11-16 15:28:55 +0100931 /* no matter what happens, tx->skb moves to tx->skbs */
932 __skb_queue_tail(&tx->skbs, skb);
933 tx->skb = NULL;
934
Johannes Berga26eb272011-10-07 14:01:25 +0200935 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
936 return TX_CONTINUE;
937
938 if (tx->local->ops->set_frag_threshold)
Johannes Berge2454942008-05-15 12:55:28 +0200939 return TX_CONTINUE;
940
Johannes Bergeefce912008-05-17 00:57:13 +0200941 /*
942 * Warn when submitting a fragmented A-MPDU frame and drop it.
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200943 * This scenario is handled in ieee80211_tx_prepare but extra
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +0300944 * caution taken here as fragmented ampdu may cause Tx stop.
Johannes Bergeefce912008-05-17 00:57:13 +0200945 */
Sujith8b30b1f2008-10-24 09:55:27 +0530946 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Bergeefce912008-05-17 00:57:13 +0200947 return TX_DROP;
948
Harvey Harrison065e96052008-06-22 16:45:27 -0700949 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2454942008-05-15 12:55:28 +0200950
Johannes Berga26eb272011-10-07 14:01:25 +0200951 /* internal error, why isn't DONTFRAG set? */
Johannes Berg8ccd8f22009-04-29 23:35:56 +0200952 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100953 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200954
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100955 /*
956 * Now fragment the frame. This will allocate all the fragments and
957 * chain them (using skb as the first fragment) to skb->next.
958 * During transmission, we will remove the successfully transmitted
959 * fragments from this list. When the low-level driver rejects one
960 * of the fragments then we will simply pretend to accept the skb
961 * but store it away as pending.
962 */
Johannes Berg252b86c2011-11-16 15:28:55 +0100963 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100964 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200965
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100966 /* update duration/seq/flags of fragments */
967 fragnum = 0;
Johannes Berg252b86c2011-11-16 15:28:55 +0100968
969 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100970 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
Johannes Berge2454942008-05-15 12:55:28 +0200971
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100972 hdr = (void *)skb->data;
973 info = IEEE80211_SKB_CB(skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200974
Johannes Berg252b86c2011-11-16 15:28:55 +0100975 if (!skb_queue_is_last(&tx->skbs, skb)) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100976 hdr->frame_control |= morefrags;
Johannes Berge6a98542008-10-21 12:40:02 +0200977 /*
978 * No multi-rate retries for fragmented frames, that
979 * would completely throw off the NAV at other STAs.
980 */
981 info->control.rates[1].idx = -1;
982 info->control.rates[2].idx = -1;
983 info->control.rates[3].idx = -1;
Thomas Huehne3e1a0b2012-07-02 19:46:16 +0200984 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
Johannes Berge6a98542008-10-21 12:40:02 +0200985 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100986 } else {
987 hdr->frame_control &= ~morefrags;
Johannes Berge6a98542008-10-21 12:40:02 +0200988 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100989 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990 fragnum++;
Johannes Berg252b86c2011-11-16 15:28:55 +0100991 }
Johannes Berge2454942008-05-15 12:55:28 +0200992
993 return TX_CONTINUE;
Johannes Berge2454942008-05-15 12:55:28 +0200994}
995
Johannes Bergd9e8a702008-06-30 15:10:44 +0200996static ieee80211_tx_result debug_noinline
Johannes Bergfeff1f22009-08-10 16:01:54 +0200997ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
998{
Johannes Berg252b86c2011-11-16 15:28:55 +0100999 struct sk_buff *skb;
Johannes Berg560d2682013-02-05 10:55:21 +01001000 int ac = -1;
Johannes Bergfeff1f22009-08-10 16:01:54 +02001001
1002 if (!tx->sta)
1003 return TX_CONTINUE;
1004
Johannes Berg252b86c2011-11-16 15:28:55 +01001005 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg560d2682013-02-05 10:55:21 +01001006 ac = skb_get_queue_mapping(skb);
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001007 tx->sta->tx_stats.bytes[ac] += skb->len;
Johannes Berg252b86c2011-11-16 15:28:55 +01001008 }
Johannes Berg560d2682013-02-05 10:55:21 +01001009 if (ac >= 0)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001010 tx->sta->tx_stats.packets[ac]++;
Johannes Bergfeff1f22009-08-10 16:01:54 +02001011
1012 return TX_CONTINUE;
1013}
1014
1015static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +02001016ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1017{
1018 if (!tx->key)
1019 return TX_CONTINUE;
1020
Johannes Berg97359d12010-08-10 09:46:38 +02001021 switch (tx->key->conf.cipher) {
1022 case WLAN_CIPHER_SUITE_WEP40:
1023 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berge2454942008-05-15 12:55:28 +02001024 return ieee80211_crypto_wep_encrypt(tx);
Johannes Berg97359d12010-08-10 09:46:38 +02001025 case WLAN_CIPHER_SUITE_TKIP:
Johannes Berge2454942008-05-15 12:55:28 +02001026 return ieee80211_crypto_tkip_encrypt(tx);
Johannes Berg97359d12010-08-10 09:46:38 +02001027 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001028 return ieee80211_crypto_ccmp_encrypt(
1029 tx, IEEE80211_CCMP_MIC_LEN);
1030 case WLAN_CIPHER_SUITE_CCMP_256:
1031 return ieee80211_crypto_ccmp_encrypt(
1032 tx, IEEE80211_CCMP_256_MIC_LEN);
Johannes Berg97359d12010-08-10 09:46:38 +02001033 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001034 return ieee80211_crypto_aes_cmac_encrypt(tx);
Jouni Malinen56c52da2015-01-24 19:52:08 +02001035 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1036 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
Jouni Malinen8ade5382015-01-24 19:52:09 +02001037 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1038 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1039 return ieee80211_crypto_aes_gmac_encrypt(tx);
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001040 case WLAN_CIPHER_SUITE_GCMP:
1041 case WLAN_CIPHER_SUITE_GCMP_256:
1042 return ieee80211_crypto_gcmp_encrypt(tx);
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001043 default:
Yoni Divinskyd32a1022012-01-16 15:18:59 +02001044 return ieee80211_crypto_hw_encrypt(tx);
Johannes Berge2454942008-05-15 12:55:28 +02001045 }
1046
Johannes Berge2454942008-05-15 12:55:28 +02001047 return TX_DROP;
1048}
1049
Johannes Bergd9e8a702008-06-30 15:10:44 +02001050static ieee80211_tx_result debug_noinline
Johannes Berg03f93c32008-06-25 14:36:27 +03001051ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1052{
Johannes Berg252b86c2011-11-16 15:28:55 +01001053 struct sk_buff *skb;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001054 struct ieee80211_hdr *hdr;
1055 int next_len;
1056 bool group_addr;
Johannes Berg03f93c32008-06-25 14:36:27 +03001057
Johannes Berg252b86c2011-11-16 15:28:55 +01001058 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001059 hdr = (void *) skb->data;
Jouni Malinen7e0aae42009-05-19 19:25:58 +03001060 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1061 break; /* must not overwrite AID */
Johannes Berg252b86c2011-11-16 15:28:55 +01001062 if (!skb_queue_is_last(&tx->skbs, skb)) {
1063 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1064 next_len = next->len;
1065 } else
1066 next_len = 0;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001067 group_addr = is_multicast_ether_addr(hdr->addr1);
Johannes Berg03f93c32008-06-25 14:36:27 +03001068
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001069 hdr->duration_id =
Johannes Berg252b86c2011-11-16 15:28:55 +01001070 ieee80211_duration(tx, skb, group_addr, next_len);
1071 }
Johannes Berg03f93c32008-06-25 14:36:27 +03001072
1073 return TX_CONTINUE;
1074}
1075
Johannes Berge2ebc742007-07-27 15:43:22 +02001076/* actual transmit path */
1077
Johannes Berga622ab72010-06-10 10:21:39 +02001078static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1079 struct sk_buff *skb,
1080 struct ieee80211_tx_info *info,
1081 struct tid_ampdu_tx *tid_tx,
1082 int tid)
1083{
1084 bool queued = false;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001085 bool reset_agg_timer = false;
Helmut Schaaaa454582012-03-07 17:20:30 +01001086 struct sk_buff *purge_skb = NULL;
Johannes Berga622ab72010-06-10 10:21:39 +02001087
1088 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1089 info->flags |= IEEE80211_TX_CTL_AMPDU;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001090 reset_agg_timer = true;
Johannes Berg0ab33702010-06-10 10:21:42 +02001091 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1092 /*
1093 * nothing -- this aggregation session is being started
1094 * but that might still fail with the driver
1095 */
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001096 } else if (!tx->sta->sta.txq[tid]) {
Johannes Berga622ab72010-06-10 10:21:39 +02001097 spin_lock(&tx->sta->lock);
1098 /*
1099 * Need to re-check now, because we may get here
1100 *
1101 * 1) in the window during which the setup is actually
1102 * already done, but not marked yet because not all
1103 * packets are spliced over to the driver pending
1104 * queue yet -- if this happened we acquire the lock
1105 * either before or after the splice happens, but
1106 * need to recheck which of these cases happened.
1107 *
1108 * 2) during session teardown, if the OPERATIONAL bit
1109 * was cleared due to the teardown but the pointer
1110 * hasn't been assigned NULL yet (or we loaded it
1111 * before it was assigned) -- in this case it may
1112 * now be NULL which means we should just let the
1113 * packet pass through because splicing the frames
1114 * back is already done.
1115 */
Johannes Berg40b275b2011-05-13 14:15:49 +02001116 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
Johannes Berga622ab72010-06-10 10:21:39 +02001117
1118 if (!tid_tx) {
1119 /* do nothing, let packet pass through */
1120 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121 info->flags |= IEEE80211_TX_CTL_AMPDU;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001122 reset_agg_timer = true;
Johannes Berga622ab72010-06-10 10:21:39 +02001123 } else {
1124 queued = true;
Emmanuel Grumbachf6d46712016-03-17 16:51:42 +02001125 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1126 clear_sta_flag(tx->sta, WLAN_STA_SP);
1127 ps_dbg(tx->sta->sdata,
1128 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1129 tx->sta->sta.addr, tx->sta->sta.aid);
1130 }
Johannes Berga622ab72010-06-10 10:21:39 +02001131 info->control.vif = &tx->sdata->vif;
1132 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Emmanuel Grumbachfacde7f2016-03-17 16:51:41 +02001133 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
Johannes Berga622ab72010-06-10 10:21:39 +02001134 __skb_queue_tail(&tid_tx->pending, skb);
Helmut Schaaaa454582012-03-07 17:20:30 +01001135 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1136 purge_skb = __skb_dequeue(&tid_tx->pending);
Johannes Berga622ab72010-06-10 10:21:39 +02001137 }
1138 spin_unlock(&tx->sta->lock);
Helmut Schaaaa454582012-03-07 17:20:30 +01001139
1140 if (purge_skb)
Felix Fietkauc3e77242012-10-08 14:39:33 +02001141 ieee80211_free_txskb(&tx->local->hw, purge_skb);
Johannes Berga622ab72010-06-10 10:21:39 +02001142 }
1143
Nikolay Martynov285fa692011-11-22 21:50:28 -05001144 /* reset session timer */
1145 if (reset_agg_timer && tid_tx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001146 tid_tx->last_tx = jiffies;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001147
Johannes Berga622ab72010-06-10 10:21:39 +02001148 return queued;
1149}
1150
Johannes Berg58d41852007-09-26 17:53:18 +02001151/*
1152 * initialises @tx
Johannes Berg7c107702015-03-20 14:18:27 +01001153 * pass %NULL for the station if unknown, a valid pointer if known
1154 * or an ERR_PTR() if the station is known not to exist
Johannes Berg58d41852007-09-26 17:53:18 +02001155 */
Johannes Berg9ae54c82008-01-31 19:48:20 +01001156static ieee80211_tx_result
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001157ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1158 struct ieee80211_tx_data *tx,
Johannes Berg7c107702015-03-20 14:18:27 +01001159 struct sta_info *sta, struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001160{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001161 struct ieee80211_local *local = sdata->local;
Johannes Berg58d41852007-09-26 17:53:18 +02001162 struct ieee80211_hdr *hdr;
Johannes Berge039fa42008-05-15 12:55:29 +02001163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg68f2b512011-10-07 14:01:24 +02001164 int tid;
Johannes Berga622ab72010-06-10 10:21:39 +02001165 u8 *qc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001166
1167 memset(tx, 0, sizeof(*tx));
1168 tx->skb = skb;
Johannes Berge2ebc742007-07-27 15:43:22 +02001169 tx->local = local;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001170 tx->sdata = sdata;
Johannes Berg252b86c2011-11-16 15:28:55 +01001171 __skb_queue_head_init(&tx->skbs);
Johannes Berge2ebc742007-07-27 15:43:22 +02001172
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001173 /*
1174 * If this flag is set to true anywhere, and we get here,
1175 * we are doing the needed processing, so remove the flag
1176 * now.
1177 */
1178 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1179
Johannes Berg58d41852007-09-26 17:53:18 +02001180 hdr = (struct ieee80211_hdr *) skb->data;
1181
Johannes Berg7c107702015-03-20 14:18:27 +01001182 if (likely(sta)) {
1183 if (!IS_ERR(sta))
1184 tx->sta = sta;
1185 } else {
1186 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1187 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1188 if (!tx->sta && sdata->wdev.use_4addr)
1189 return TX_DROP;
1190 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1191 IEEE80211_TX_CTL_INJECTED) ||
1192 tx->sdata->control_port_protocol == tx->skb->protocol) {
1193 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1194 }
1195 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1196 tx->sta = sta_info_get(sdata, hdr->addr1);
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001197 }
Johannes Berg58d41852007-09-26 17:53:18 +02001198
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001199 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
Johannes Berg49a59542011-09-29 16:04:41 +02001200 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
Johannes Berg30686bf2015-06-02 21:39:54 +02001201 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1202 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001203 struct tid_ampdu_tx *tid_tx;
1204
Sujith8b30b1f2008-10-24 09:55:27 +05301205 qc = ieee80211_get_qos_ctl(hdr);
1206 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1207
Johannes Berga622ab72010-06-10 10:21:39 +02001208 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1209 if (tid_tx) {
1210 bool queued;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001211
Johannes Berga622ab72010-06-10 10:21:39 +02001212 queued = ieee80211_tx_prep_agg(tx, skb, info,
1213 tid_tx, tid);
1214
1215 if (unlikely(queued))
1216 return TX_QUEUED;
1217 }
Sujith8b30b1f2008-10-24 09:55:27 +05301218 }
1219
Jiri Slabybadffb72007-08-28 17:01:54 -04001220 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001221 tx->flags &= ~IEEE80211_TX_UNICAST;
Johannes Berge039fa42008-05-15 12:55:29 +02001222 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Simon Wunderlich6fd67e92011-11-18 14:20:42 +01001223 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +01001224 tx->flags |= IEEE80211_TX_UNICAST;
Johannes Berg58d41852007-09-26 17:53:18 +02001225
Johannes Berga26eb272011-10-07 14:01:25 +02001226 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1227 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1228 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1229 info->flags & IEEE80211_TX_CTL_AMPDU)
1230 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
Johannes Berg58d41852007-09-26 17:53:18 +02001231 }
1232
Johannes Berge2ebc742007-07-27 15:43:22 +02001233 if (!tx->sta)
Johannes Berge039fa42008-05-15 12:55:29 +02001234 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Felix Fietkauf7418bc2015-09-24 14:59:49 +02001235 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
Johannes Berge039fa42008-05-15 12:55:29 +02001236 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Felix Fietkauf7418bc2015-09-24 14:59:49 +02001237 ieee80211_check_fast_xmit(tx->sta);
1238 }
Johannes Berg58d41852007-09-26 17:53:18 +02001239
Johannes Berge039fa42008-05-15 12:55:29 +02001240 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge2ebc742007-07-27 15:43:22 +02001241
Johannes Berg9ae54c82008-01-31 19:48:20 +01001242 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +02001243}
1244
Michal Kazior80a83cf2016-05-19 10:37:48 +02001245static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1246 struct ieee80211_vif *vif,
Michal Kaziorcda72bb2017-01-13 13:32:51 +01001247 struct sta_info *sta,
Michal Kazior80a83cf2016-05-19 10:37:48 +02001248 struct sk_buff *skb)
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001249{
1250 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001251 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001252 struct ieee80211_txq *txq = NULL;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001253
Felix Fietkauc3732a72016-02-28 15:19:53 +01001254 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1255 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
Michal Kazior80a83cf2016-05-19 10:37:48 +02001256 return NULL;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001257
1258 if (!ieee80211_is_data(hdr->frame_control))
Michal Kazior80a83cf2016-05-19 10:37:48 +02001259 return NULL;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001260
Michal Kaziorcda72bb2017-01-13 13:32:51 +01001261 if (sta) {
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001262 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1263
Michal Kaziorcda72bb2017-01-13 13:32:51 +01001264 if (!sta->uploaded)
1265 return NULL;
1266
1267 txq = sta->sta.txq[tid];
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001268 } else if (vif) {
1269 txq = vif->txq;
1270 }
1271
1272 if (!txq)
Michal Kazior80a83cf2016-05-19 10:37:48 +02001273 return NULL;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001274
Michal Kazior80a83cf2016-05-19 10:37:48 +02001275 return to_txq_info(txq);
1276}
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001277
Michal Kazior5caa3282016-05-19 10:37:51 +02001278static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1279{
1280 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1281}
1282
Michal Kazior5caa3282016-05-19 10:37:51 +02001283static u32 codel_skb_len_func(const struct sk_buff *skb)
1284{
1285 return skb->len;
1286}
1287
1288static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1289{
1290 const struct ieee80211_tx_info *info;
1291
1292 info = (const struct ieee80211_tx_info *)skb->cb;
1293 return info->control.enqueue_time;
1294}
1295
1296static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1297 void *ctx)
1298{
1299 struct ieee80211_local *local;
1300 struct txq_info *txqi;
1301 struct fq *fq;
1302 struct fq_flow *flow;
1303
1304 txqi = ctx;
1305 local = vif_to_sdata(txqi->txq.vif)->local;
1306 fq = &local->fq;
1307
1308 if (cvars == &txqi->def_cvars)
1309 flow = &txqi->def_flow;
1310 else
1311 flow = &fq->flows[cvars - local->cvars];
1312
1313 return fq_flow_dequeue(fq, flow);
1314}
1315
1316static void codel_drop_func(struct sk_buff *skb,
1317 void *ctx)
1318{
1319 struct ieee80211_local *local;
1320 struct ieee80211_hw *hw;
1321 struct txq_info *txqi;
1322
1323 txqi = ctx;
1324 local = vif_to_sdata(txqi->txq.vif)->local;
1325 hw = &local->hw;
1326
1327 ieee80211_free_txskb(hw, skb);
1328}
1329
Michal Kaziorfa962b92016-05-19 10:37:49 +02001330static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1331 struct fq_tin *tin,
1332 struct fq_flow *flow)
1333{
Michal Kazior5caa3282016-05-19 10:37:51 +02001334 struct ieee80211_local *local;
1335 struct txq_info *txqi;
1336 struct codel_vars *cvars;
1337 struct codel_params *cparams;
1338 struct codel_stats *cstats;
1339
1340 local = container_of(fq, struct ieee80211_local, fq);
1341 txqi = container_of(tin, struct txq_info, tin);
1342 cparams = &local->cparams;
Toke Høiland-Jørgensen8d51dbb2016-09-12 15:55:43 +02001343 cstats = &txqi->cstats;
Michal Kazior5caa3282016-05-19 10:37:51 +02001344
1345 if (flow == &txqi->def_flow)
1346 cvars = &txqi->def_cvars;
1347 else
1348 cvars = &local->cvars[flow - fq->flows];
1349
1350 return codel_dequeue(txqi,
1351 &flow->backlog,
1352 cparams,
1353 cvars,
1354 cstats,
1355 codel_skb_len_func,
1356 codel_skb_time_func,
1357 codel_drop_func,
1358 codel_dequeue_func);
Michal Kaziorfa962b92016-05-19 10:37:49 +02001359}
1360
1361static void fq_skb_free_func(struct fq *fq,
1362 struct fq_tin *tin,
1363 struct fq_flow *flow,
1364 struct sk_buff *skb)
1365{
1366 struct ieee80211_local *local;
1367
1368 local = container_of(fq, struct ieee80211_local, fq);
1369 ieee80211_free_txskb(&local->hw, skb);
1370}
1371
1372static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1373 struct fq_tin *tin,
1374 int idx,
1375 struct sk_buff *skb)
1376{
1377 struct txq_info *txqi;
1378
1379 txqi = container_of(tin, struct txq_info, tin);
1380 return &txqi->def_flow;
1381}
1382
Michal Kazior80a83cf2016-05-19 10:37:48 +02001383static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1384 struct txq_info *txqi,
1385 struct sk_buff *skb)
1386{
Michal Kaziorfa962b92016-05-19 10:37:49 +02001387 struct fq *fq = &local->fq;
1388 struct fq_tin *tin = &txqi->tin;
Michal Kazior80a83cf2016-05-19 10:37:48 +02001389
Michal Kazior5caa3282016-05-19 10:37:51 +02001390 ieee80211_set_skb_enqueue_time(skb);
Michal Kaziorfa962b92016-05-19 10:37:49 +02001391 fq_tin_enqueue(fq, tin, skb,
1392 fq_skb_free_func,
1393 fq_flow_get_default_func);
1394}
Michal Kazior80a83cf2016-05-19 10:37:48 +02001395
Michal Kaziorfa962b92016-05-19 10:37:49 +02001396void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1397 struct sta_info *sta,
1398 struct txq_info *txqi, int tid)
1399{
1400 fq_tin_init(&txqi->tin);
1401 fq_flow_init(&txqi->def_flow);
Michal Kazior5caa3282016-05-19 10:37:51 +02001402 codel_vars_init(&txqi->def_cvars);
Toke Høiland-Jørgensen8d51dbb2016-09-12 15:55:43 +02001403 codel_stats_init(&txqi->cstats);
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001404 __skb_queue_head_init(&txqi->frags);
Michal Kaziorfa962b92016-05-19 10:37:49 +02001405
1406 txqi->txq.vif = &sdata->vif;
1407
1408 if (sta) {
1409 txqi->txq.sta = &sta->sta;
1410 sta->sta.txq[tid] = &txqi->txq;
1411 txqi->txq.tid = tid;
1412 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1413 } else {
1414 sdata->vif.txq = &txqi->txq;
1415 txqi->txq.tid = 0;
1416 txqi->txq.ac = IEEE80211_AC_BE;
Michal Kazior80a83cf2016-05-19 10:37:48 +02001417 }
Michal Kaziorfa962b92016-05-19 10:37:49 +02001418}
Michal Kazior80a83cf2016-05-19 10:37:48 +02001419
Michal Kaziorfa962b92016-05-19 10:37:49 +02001420void ieee80211_txq_purge(struct ieee80211_local *local,
1421 struct txq_info *txqi)
1422{
1423 struct fq *fq = &local->fq;
1424 struct fq_tin *tin = &txqi->tin;
1425
1426 fq_tin_reset(fq, tin, fq_skb_free_func);
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001427 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
Michal Kaziorfa962b92016-05-19 10:37:49 +02001428}
1429
1430int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1431{
1432 struct fq *fq = &local->fq;
1433 int ret;
Michal Kazior5caa3282016-05-19 10:37:51 +02001434 int i;
Toke Høiland-Jørgensen3ff23cd2016-09-23 21:59:11 +02001435 bool supp_vht = false;
1436 enum nl80211_band band;
Michal Kaziorfa962b92016-05-19 10:37:49 +02001437
1438 if (!local->ops->wake_tx_queue)
1439 return 0;
1440
1441 ret = fq_init(fq, 4096);
1442 if (ret)
1443 return ret;
1444
Toke Høiland-Jørgensen3ff23cd2016-09-23 21:59:11 +02001445 /*
1446 * If the hardware doesn't support VHT, it is safe to limit the maximum
1447 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1448 */
1449 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1450 struct ieee80211_supported_band *sband;
1451
1452 sband = local->hw.wiphy->bands[band];
1453 if (!sband)
1454 continue;
1455
1456 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1457 }
1458
1459 if (!supp_vht)
1460 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1461
Michal Kazior5caa3282016-05-19 10:37:51 +02001462 codel_params_init(&local->cparams);
Michal Kazior5caa3282016-05-19 10:37:51 +02001463 local->cparams.interval = MS2TIME(100);
1464 local->cparams.target = MS2TIME(20);
1465 local->cparams.ecn = true;
1466
1467 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1468 GFP_KERNEL);
1469 if (!local->cvars) {
Michal Kazior59a7c822016-06-29 14:00:34 +02001470 spin_lock_bh(&fq->lock);
Michal Kazior5caa3282016-05-19 10:37:51 +02001471 fq_reset(fq, fq_skb_free_func);
Michal Kazior59a7c822016-06-29 14:00:34 +02001472 spin_unlock_bh(&fq->lock);
Michal Kazior5caa3282016-05-19 10:37:51 +02001473 return -ENOMEM;
1474 }
1475
1476 for (i = 0; i < fq->flows_cnt; i++)
1477 codel_vars_init(&local->cvars[i]);
1478
Michal Kaziorfa962b92016-05-19 10:37:49 +02001479 return 0;
1480}
1481
1482void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1483{
1484 struct fq *fq = &local->fq;
1485
1486 if (!local->ops->wake_tx_queue)
1487 return;
1488
Michal Kazior5caa3282016-05-19 10:37:51 +02001489 kfree(local->cvars);
1490 local->cvars = NULL;
1491
Michal Kazior59a7c822016-06-29 14:00:34 +02001492 spin_lock_bh(&fq->lock);
Michal Kaziorfa962b92016-05-19 10:37:49 +02001493 fq_reset(fq, fq_skb_free_func);
Michal Kazior59a7c822016-06-29 14:00:34 +02001494 spin_unlock_bh(&fq->lock);
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001495}
1496
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001497static bool ieee80211_queue_skb(struct ieee80211_local *local,
1498 struct ieee80211_sub_if_data *sdata,
1499 struct sta_info *sta,
1500 struct sk_buff *skb)
1501{
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001502 struct fq *fq = &local->fq;
1503 struct ieee80211_vif *vif;
1504 struct txq_info *txqi;
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001505
1506 if (!local->ops->wake_tx_queue ||
1507 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1508 return false;
1509
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001510 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1511 sdata = container_of(sdata->bss,
1512 struct ieee80211_sub_if_data, u.ap);
1513
1514 vif = &sdata->vif;
Michal Kaziorcda72bb2017-01-13 13:32:51 +01001515 txqi = ieee80211_get_txq(local, vif, sta, skb);
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001516
1517 if (!txqi)
1518 return false;
1519
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001520 spin_lock_bh(&fq->lock);
1521 ieee80211_txq_enqueue(local, txqi, skb);
1522 spin_unlock_bh(&fq->lock);
1523
1524 drv_wake_tx_queue(local, txqi);
1525
1526 return true;
1527}
1528
Johannes Berg11127e92011-11-16 16:02:47 +01001529static bool ieee80211_tx_frags(struct ieee80211_local *local,
1530 struct ieee80211_vif *vif,
1531 struct ieee80211_sta *sta,
1532 struct sk_buff_head *skbs,
1533 bool txpending)
Johannes Berge2ebc742007-07-27 15:43:22 +02001534{
Michal Kazior80a83cf2016-05-19 10:37:48 +02001535 struct ieee80211_tx_control control = {};
Johannes Berg252b86c2011-11-16 15:28:55 +01001536 struct sk_buff *skb, *tmp;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001537 unsigned long flags;
Johannes Berge2ebc742007-07-27 15:43:22 +02001538
Johannes Berg252b86c2011-11-16 15:28:55 +01001539 skb_queue_walk_safe(skbs, skb, tmp) {
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1541 int q = info->hw_queue;
1542
1543#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1544 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1545 __skb_unlink(skb, skbs);
Felix Fietkauc3e77242012-10-08 14:39:33 +02001546 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001547 continue;
1548 }
1549#endif
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001550
1551 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001552 if (local->queue_stop_reasons[q] ||
Johannes Berg7bb45682011-02-24 14:42:06 +01001553 (!txpending && !skb_queue_empty(&local->pending[q]))) {
Seth Forshee6c17b772013-02-11 11:21:07 -06001554 if (unlikely(info->flags &
Seth Forsheea7679ed2013-02-25 14:58:05 -06001555 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1556 if (local->queue_stop_reasons[q] &
1557 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1558 /*
1559 * Drop off-channel frames if queues
1560 * are stopped for any reason other
1561 * than off-channel operation. Never
1562 * queue them.
1563 */
1564 spin_unlock_irqrestore(
1565 &local->queue_stop_reason_lock,
1566 flags);
1567 ieee80211_purge_tx_queue(&local->hw,
1568 skbs);
1569 return true;
1570 }
1571 } else {
1572
Seth Forshee6c17b772013-02-11 11:21:07 -06001573 /*
Seth Forsheea7679ed2013-02-25 14:58:05 -06001574 * Since queue is stopped, queue up frames for
1575 * later transmission from the tx-pending
1576 * tasklet when the queue is woken again.
Seth Forshee6c17b772013-02-11 11:21:07 -06001577 */
Seth Forsheea7679ed2013-02-25 14:58:05 -06001578 if (txpending)
1579 skb_queue_splice_init(skbs,
1580 &local->pending[q]);
1581 else
1582 skb_queue_splice_tail_init(skbs,
1583 &local->pending[q]);
1584
1585 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1586 flags);
1587 return false;
Seth Forshee6c17b772013-02-11 11:21:07 -06001588 }
Johannes Berg7bb45682011-02-24 14:42:06 +01001589 }
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001590 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001591
Johannes Berg11127e92011-11-16 16:02:47 +01001592 info->control.vif = vif;
Michal Kazior80a83cf2016-05-19 10:37:48 +02001593 control.sta = sta;
Johannes Bergec25acc2010-07-22 17:11:28 +02001594
Johannes Berg252b86c2011-11-16 15:28:55 +01001595 __skb_unlink(skb, skbs);
Michal Kazior80a83cf2016-05-19 10:37:48 +02001596 drv_tx(local, &control, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001597 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001598
Johannes Berg11127e92011-11-16 16:02:47 +01001599 return true;
1600}
1601
1602/*
1603 * Returns false if the frame couldn't be transmitted but was queued instead.
1604 */
1605static bool __ieee80211_tx(struct ieee80211_local *local,
1606 struct sk_buff_head *skbs, int led_len,
1607 struct sta_info *sta, bool txpending)
1608{
1609 struct ieee80211_tx_info *info;
1610 struct ieee80211_sub_if_data *sdata;
1611 struct ieee80211_vif *vif;
1612 struct ieee80211_sta *pubsta;
1613 struct sk_buff *skb;
1614 bool result = true;
1615 __le16 fc;
1616
1617 if (WARN_ON(skb_queue_empty(skbs)))
1618 return true;
1619
1620 skb = skb_peek(skbs);
1621 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1622 info = IEEE80211_SKB_CB(skb);
1623 sdata = vif_to_sdata(info->control.vif);
1624 if (sta && !sta->uploaded)
1625 sta = NULL;
1626
1627 if (sta)
1628 pubsta = &sta->sta;
1629 else
1630 pubsta = NULL;
1631
1632 switch (sdata->vif.type) {
1633 case NL80211_IFTYPE_MONITOR:
Aviya Erenfeldd8212182016-08-29 23:25:15 +03001634 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
Johannes Bergc82b5a72013-07-14 23:39:20 +03001635 vif = &sdata->vif;
1636 break;
1637 }
Johannes Berg4b6f1dd2012-04-03 14:35:57 +02001638 sdata = rcu_dereference(local->monitor_sdata);
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001639 if (sdata) {
Johannes Berg4b6f1dd2012-04-03 14:35:57 +02001640 vif = &sdata->vif;
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001641 info->hw_queue =
1642 vif->hw_queue[skb_get_queue_mapping(skb)];
Johannes Berg30686bf2015-06-02 21:39:54 +02001643 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
Johannes Berg63b4d8b2015-11-24 15:41:50 +01001644 ieee80211_purge_tx_queue(&local->hw, skbs);
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001645 return true;
1646 } else
Johannes Berg4b6f1dd2012-04-03 14:35:57 +02001647 vif = NULL;
Johannes Berg11127e92011-11-16 16:02:47 +01001648 break;
1649 case NL80211_IFTYPE_AP_VLAN:
1650 sdata = container_of(sdata->bss,
1651 struct ieee80211_sub_if_data, u.ap);
1652 /* fall through */
1653 default:
1654 vif = &sdata->vif;
1655 break;
1656 }
1657
Johannes Bergcb831b52012-07-02 15:40:18 +02001658 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1659 txpending);
Johannes Berg11127e92011-11-16 16:02:47 +01001660
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001661 ieee80211_tpt_led_trig_tx(local, fc, led_len);
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001662
Johannes Berg4db4e0a2011-11-24 14:47:36 +01001663 WARN_ON_ONCE(!skb_queue_empty(skbs));
Johannes Berg252b86c2011-11-16 15:28:55 +01001664
Johannes Berg11127e92011-11-16 16:02:47 +01001665 return result;
Johannes Berge2ebc742007-07-27 15:43:22 +02001666}
1667
Johannes Berg97b045d2008-06-20 01:22:30 +02001668/*
1669 * Invoke TX handlers, return 0 on success and non-zero if the
1670 * frame was dropped or queued.
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001671 *
1672 * The handlers are split into an early and late part. The latter is everything
1673 * that can be sensitive to reordering, and will be deferred to after packets
1674 * are dequeued from the intermediate queues (when they are enabled).
Johannes Berg97b045d2008-06-20 01:22:30 +02001675 */
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001676static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
Johannes Berg97b045d2008-06-20 01:22:30 +02001677{
Johannes Berg97b045d2008-06-20 01:22:30 +02001678 ieee80211_tx_result res = TX_DROP;
Johannes Berg97b045d2008-06-20 01:22:30 +02001679
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001680#define CALL_TXH(txh) \
1681 do { \
1682 res = txh(tx); \
1683 if (res != TX_CONTINUE) \
1684 goto txh_done; \
1685 } while (0)
Johannes Berg97b045d2008-06-20 01:22:30 +02001686
Kalle Valo5c1b98a2010-01-12 10:42:46 +02001687 CALL_TXH(ieee80211_tx_h_dynamic_ps);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001688 CALL_TXH(ieee80211_tx_h_check_assoc);
1689 CALL_TXH(ieee80211_tx_h_ps_buf);
Johannes Berga621fa42010-08-27 14:26:54 +03001690 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001691 CALL_TXH(ieee80211_tx_h_select_key);
Johannes Berg30686bf2015-06-02 21:39:54 +02001692 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
Johannes Bergaf65cd962009-11-17 18:18:36 +01001693 CALL_TXH(ieee80211_tx_h_rate_ctrl);
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001694
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001695 txh_done:
1696 if (unlikely(res == TX_DROP)) {
1697 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1698 if (tx->skb)
1699 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1700 else
1701 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1702 return -1;
1703 } else if (unlikely(res == TX_QUEUED)) {
1704 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1705 return -1;
1706 }
1707
1708 return 0;
1709}
1710
1711/*
1712 * Late handlers can be called while the sta lock is held. Handlers that can
1713 * cause packets to be generated will cause deadlock!
1714 */
1715static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1716{
1717 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1718 ieee80211_tx_result res = TX_CONTINUE;
1719
Johannes Bergaa5b5492011-12-02 22:08:52 +01001720 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1721 __skb_queue_tail(&tx->skbs, tx->skb);
1722 tx->skb = NULL;
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001723 goto txh_done;
Johannes Bergaa5b5492011-12-02 22:08:52 +01001724 }
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001725
1726 CALL_TXH(ieee80211_tx_h_michael_mic_add);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001727 CALL_TXH(ieee80211_tx_h_sequence);
1728 CALL_TXH(ieee80211_tx_h_fragment);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001729 /* handlers after fragment must be aware of tx info fragmentation! */
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001730 CALL_TXH(ieee80211_tx_h_stats);
1731 CALL_TXH(ieee80211_tx_h_encrypt);
Johannes Berg30686bf2015-06-02 21:39:54 +02001732 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
Arik Nemtsov8fd369e2011-01-31 22:29:12 +02001733 CALL_TXH(ieee80211_tx_h_calculate_duration);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001734#undef CALL_TXH
1735
1736 txh_done:
Johannes Berg97b045d2008-06-20 01:22:30 +02001737 if (unlikely(res == TX_DROP)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001738 I802_DEBUG_INC(tx->local->tx_handlers_drop);
Johannes Berg252b86c2011-11-16 15:28:55 +01001739 if (tx->skb)
Felix Fietkauc3e77242012-10-08 14:39:33 +02001740 ieee80211_free_txskb(&tx->local->hw, tx->skb);
Johannes Berg252b86c2011-11-16 15:28:55 +01001741 else
Felix Fietkau1f98ab72012-11-10 03:44:14 +01001742 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
Johannes Berg97b045d2008-06-20 01:22:30 +02001743 return -1;
1744 } else if (unlikely(res == TX_QUEUED)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001745 I802_DEBUG_INC(tx->local->tx_handlers_queued);
Johannes Berg97b045d2008-06-20 01:22:30 +02001746 return -1;
1747 }
1748
1749 return 0;
1750}
1751
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001752static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1753{
1754 int r = invoke_tx_handlers_early(tx);
1755
1756 if (r)
1757 return r;
1758 return invoke_tx_handlers_late(tx);
1759}
1760
Felix Fietkau06be6b12013-10-14 18:01:00 +02001761bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1762 struct ieee80211_vif *vif, struct sk_buff *skb,
1763 int band, struct ieee80211_sta **sta)
1764{
1765 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1766 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1767 struct ieee80211_tx_data tx;
Johannes Berg88724a82015-03-01 09:10:12 +02001768 struct sk_buff *skb2;
Felix Fietkau06be6b12013-10-14 18:01:00 +02001769
Johannes Berg7c107702015-03-20 14:18:27 +01001770 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
Felix Fietkau06be6b12013-10-14 18:01:00 +02001771 return false;
1772
1773 info->band = band;
1774 info->control.vif = vif;
1775 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1776
1777 if (invoke_tx_handlers(&tx))
1778 return false;
1779
1780 if (sta) {
1781 if (tx.sta)
1782 *sta = &tx.sta->sta;
1783 else
1784 *sta = NULL;
1785 }
1786
Johannes Berg88724a82015-03-01 09:10:12 +02001787 /* this function isn't suitable for fragmented data frames */
1788 skb2 = __skb_dequeue(&tx.skbs);
1789 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1790 ieee80211_free_txskb(hw, skb2);
1791 ieee80211_purge_tx_queue(hw, &tx.skbs);
1792 return false;
1793 }
1794
Felix Fietkau06be6b12013-10-14 18:01:00 +02001795 return true;
1796}
1797EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1798
Johannes Berg7bb45682011-02-24 14:42:06 +01001799/*
1800 * Returns false if the frame couldn't be transmitted but was queued instead.
1801 */
1802static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
Johannes Berg7c107702015-03-20 14:18:27 +01001803 struct sta_info *sta, struct sk_buff *skb,
1804 bool txpending)
Johannes Berge2ebc742007-07-27 15:43:22 +02001805{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001806 struct ieee80211_local *local = sdata->local;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001807 struct ieee80211_tx_data tx;
Johannes Berg97b045d2008-06-20 01:22:30 +02001808 ieee80211_tx_result res_prepare;
Johannes Berge039fa42008-05-15 12:55:29 +02001809 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg7bb45682011-02-24 14:42:06 +01001810 bool result = true;
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001811 int led_len;
Johannes Berge2ebc742007-07-27 15:43:22 +02001812
Johannes Berge2ebc742007-07-27 15:43:22 +02001813 if (unlikely(skb->len < 10)) {
1814 dev_kfree_skb(skb);
Johannes Berg7bb45682011-02-24 14:42:06 +01001815 return true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001816 }
1817
Johannes Berg58d41852007-09-26 17:53:18 +02001818 /* initialises tx */
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001819 led_len = skb->len;
Johannes Berg7c107702015-03-20 14:18:27 +01001820 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001821
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001822 if (unlikely(res_prepare == TX_DROP)) {
Felix Fietkauc3e77242012-10-08 14:39:33 +02001823 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg55de9082012-07-26 17:24:39 +02001824 return true;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001825 } else if (unlikely(res_prepare == TX_QUEUED)) {
Johannes Berg55de9082012-07-26 17:24:39 +02001826 return true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001827 }
1828
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001829 /* set up hw_queue value early */
1830 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
Johannes Berg30686bf2015-06-02 21:39:54 +02001831 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001832 info->hw_queue =
1833 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1834
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001835 if (invoke_tx_handlers_early(&tx))
Bob Copeland147953b2018-09-05 06:22:59 -04001836 return true;
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02001837
1838 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1839 return true;
1840
1841 if (!invoke_tx_handlers_late(&tx))
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001842 result = __ieee80211_tx(local, &tx.skbs, led_len,
1843 tx.sta, txpending);
Johannes Berg55de9082012-07-26 17:24:39 +02001844
Johannes Berg7bb45682011-02-24 14:42:06 +01001845 return result;
Johannes Berge2ebc742007-07-27 15:43:22 +02001846}
1847
1848/* device xmit handlers */
1849
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +05301850static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
Johannes Berg23c07522008-05-29 10:38:53 +02001851 struct sk_buff *skb,
1852 int head_need, bool may_encrypt)
1853{
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +05301854 struct ieee80211_local *local = sdata->local;
Felix Fietkau0bf7aef2019-01-29 11:10:57 +01001855 struct ieee80211_hdr *hdr;
1856 bool enc_tailroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001857 int tail_need = 0;
1858
Felix Fietkau0bf7aef2019-01-29 11:10:57 +01001859 hdr = (struct ieee80211_hdr *) skb->data;
1860 enc_tailroom = may_encrypt &&
1861 (sdata->crypto_tx_tailroom_needed_cnt ||
1862 ieee80211_is_mgmt(hdr->frame_control));
1863
1864 if (enc_tailroom) {
Johannes Berg23c07522008-05-29 10:38:53 +02001865 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1866 tail_need -= skb_tailroom(skb);
1867 tail_need = max_t(int, tail_need, 0);
1868 }
1869
Ido Yarivc70f59a2014-07-29 15:39:14 +03001870 if (skb_cloned(skb) &&
Johannes Berg30686bf2015-06-02 21:39:54 +02001871 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
Felix Fietkau0bf7aef2019-01-29 11:10:57 +01001872 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
Johannes Berg23c07522008-05-29 10:38:53 +02001873 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
Felix Fietkau4cd06a32010-12-18 19:30:49 +01001874 else if (head_need || tail_need)
Johannes Berg23c07522008-05-29 10:38:53 +02001875 I802_DEBUG_INC(local->tx_expand_skb_head);
Felix Fietkau4cd06a32010-12-18 19:30:49 +01001876 else
1877 return 0;
Johannes Berg23c07522008-05-29 10:38:53 +02001878
1879 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
Joe Perches0fb9a9e2010-08-20 16:25:38 -07001880 wiphy_debug(local->hw.wiphy,
1881 "failed to reallocate TX buffer\n");
Johannes Berg23c07522008-05-29 10:38:53 +02001882 return -ENOMEM;
1883 }
1884
Johannes Berg23c07522008-05-29 10:38:53 +02001885 return 0;
1886}
1887
Johannes Berg7c107702015-03-20 14:18:27 +01001888void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1889 struct sta_info *sta, struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001890{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001891 struct ieee80211_local *local = sdata->local;
Johannes Berge039fa42008-05-15 12:55:29 +02001892 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001893 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berge2ebc742007-07-27 15:43:22 +02001894 int headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001895 bool may_encrypt;
Johannes Berge2ebc742007-07-27 15:43:22 +02001896
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001897 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
Johannes Berg23c07522008-05-29 10:38:53 +02001898
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001899 headroom = local->tx_headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001900 if (may_encrypt)
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001901 headroom += sdata->encrypt_headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001902 headroom -= skb_headroom(skb);
1903 headroom = max_t(int, 0, headroom);
1904
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +05301905 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
Felix Fietkauc3e77242012-10-08 14:39:33 +02001906 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001907 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001908 }
1909
Steve deRosier740c1aa2010-09-11 20:01:31 -07001910 hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001911 info->control.vif = &sdata->vif;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001912
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001913 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1914 if (ieee80211_is_data(hdr->frame_control) &&
1915 is_unicast_ether_addr(hdr->addr1)) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01001916 if (mesh_nexthop_resolve(sdata, skb))
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001917 return; /* skb queued: don't free */
1918 } else {
1919 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1920 }
Johannes Berg98aed9f2012-03-27 14:18:36 +02001921 }
Javier Cardonacca89492009-08-10 17:29:29 -07001922
Javier Cardona2154c812011-09-07 17:49:53 -07001923 ieee80211_set_qos_hdr(sdata, skb);
Johannes Berg7c107702015-03-20 14:18:27 +01001924 ieee80211_tx(sdata, sta, skb, false);
Johannes Berge2ebc742007-07-27 15:43:22 +02001925}
1926
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01001927static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1928 struct sk_buff *skb)
Johannes Berg73b9f032011-10-07 14:01:26 +02001929{
1930 struct ieee80211_radiotap_iterator iterator;
1931 struct ieee80211_radiotap_header *rthdr =
1932 (struct ieee80211_radiotap_header *) skb->data;
1933 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01001934 struct ieee80211_supported_band *sband =
1935 local->hw.wiphy->bands[info->band];
Johannes Berg73b9f032011-10-07 14:01:26 +02001936 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1937 NULL);
1938 u16 txflags;
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01001939 u16 rate = 0;
1940 bool rate_found = false;
1941 u8 rate_retries = 0;
1942 u16 rate_flags = 0;
Sven Eckelmannf66b60f2016-02-24 16:25:49 +01001943 u8 mcs_known, mcs_flags, mcs_bw;
Lorenzo Bianconi646e76b2016-02-23 15:43:35 +01001944 u16 vht_known;
1945 u8 vht_mcs = 0, vht_nss = 0;
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01001946 int i;
Johannes Berg73b9f032011-10-07 14:01:26 +02001947
1948 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1949 IEEE80211_TX_CTL_DONTFRAG;
1950
1951 /*
1952 * for every radiotap entry that is present
1953 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1954 * entries present, or -EINVAL on error)
1955 */
1956
1957 while (!ret) {
1958 ret = ieee80211_radiotap_iterator_next(&iterator);
1959
1960 if (ret)
1961 continue;
1962
1963 /* see if this argument is something we can use */
1964 switch (iterator.this_arg_index) {
1965 /*
1966 * You must take care when dereferencing iterator.this_arg
1967 * for multibyte types... the pointer is not aligned. Use
1968 * get_unaligned((type *)iterator.this_arg) to dereference
1969 * iterator.this_arg for type "type" safely on all arches.
1970 */
1971 case IEEE80211_RADIOTAP_FLAGS:
1972 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1973 /*
1974 * this indicates that the skb we have been
1975 * handed has the 32-bit FCS CRC at the end...
1976 * we should react to that by snipping it off
1977 * because it will be recomputed and added
1978 * on transmission
1979 */
1980 if (skb->len < (iterator._max_length + FCS_LEN))
1981 return false;
1982
1983 skb_trim(skb, skb->len - FCS_LEN);
1984 }
1985 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1986 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1987 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1988 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1989 break;
1990
1991 case IEEE80211_RADIOTAP_TX_FLAGS:
1992 txflags = get_unaligned_le16(iterator.this_arg);
1993 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1994 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1995 break;
1996
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01001997 case IEEE80211_RADIOTAP_RATE:
1998 rate = *iterator.this_arg;
1999 rate_flags = 0;
2000 rate_found = true;
2001 break;
2002
2003 case IEEE80211_RADIOTAP_DATA_RETRIES:
2004 rate_retries = *iterator.this_arg;
2005 break;
2006
2007 case IEEE80211_RADIOTAP_MCS:
2008 mcs_known = iterator.this_arg[0];
2009 mcs_flags = iterator.this_arg[1];
2010 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2011 break;
2012
2013 rate_found = true;
2014 rate = iterator.this_arg[2];
2015 rate_flags = IEEE80211_TX_RC_MCS;
2016
2017 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2018 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2019 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2020
Sven Eckelmannf66b60f2016-02-24 16:25:49 +01002021 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01002022 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
Sven Eckelmannf66b60f2016-02-24 16:25:49 +01002023 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01002024 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2025 break;
2026
Lorenzo Bianconi646e76b2016-02-23 15:43:35 +01002027 case IEEE80211_RADIOTAP_VHT:
2028 vht_known = get_unaligned_le16(iterator.this_arg);
2029 rate_found = true;
2030
2031 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2032 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2033 (iterator.this_arg[2] &
2034 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2035 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2036 if (vht_known &
2037 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2038 if (iterator.this_arg[3] == 1)
2039 rate_flags |=
2040 IEEE80211_TX_RC_40_MHZ_WIDTH;
2041 else if (iterator.this_arg[3] == 4)
2042 rate_flags |=
2043 IEEE80211_TX_RC_80_MHZ_WIDTH;
2044 else if (iterator.this_arg[3] == 11)
2045 rate_flags |=
2046 IEEE80211_TX_RC_160_MHZ_WIDTH;
2047 }
2048
2049 vht_mcs = iterator.this_arg[4] >> 4;
2050 vht_nss = iterator.this_arg[4] & 0xF;
2051 break;
2052
Johannes Berg73b9f032011-10-07 14:01:26 +02002053 /*
2054 * Please update the file
2055 * Documentation/networking/mac80211-injection.txt
2056 * when parsing new fields here.
2057 */
2058
2059 default:
2060 break;
2061 }
2062 }
2063
2064 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2065 return false;
2066
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01002067 if (rate_found) {
2068 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2069
2070 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2071 info->control.rates[i].idx = -1;
2072 info->control.rates[i].flags = 0;
2073 info->control.rates[i].count = 0;
2074 }
2075
2076 if (rate_flags & IEEE80211_TX_RC_MCS) {
2077 info->control.rates[0].idx = rate;
Lorenzo Bianconi646e76b2016-02-23 15:43:35 +01002078 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2079 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2080 vht_nss);
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01002081 } else {
2082 for (i = 0; i < sband->n_bitrates; i++) {
2083 if (rate * 5 != sband->bitrates[i].bitrate)
2084 continue;
2085
2086 info->control.rates[0].idx = i;
2087 break;
2088 }
2089 }
2090
Felix Fietkau07310a62016-03-02 15:54:51 +01002091 if (info->control.rates[0].idx < 0)
2092 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2093
Sven Eckelmanndfdfc2b2016-01-26 17:11:13 +01002094 info->control.rates[0].flags = rate_flags;
2095 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2096 local->hw.max_rate_tries);
2097 }
2098
Johannes Berg73b9f032011-10-07 14:01:26 +02002099 /*
2100 * remove the radiotap header
2101 * iterator->_max_length was sanity-checked against
2102 * skb->len by iterator init
2103 */
2104 skb_pull(skb, iterator._max_length);
2105
2106 return true;
2107}
2108
Stephen Hemmingerd0cf9c02009-08-31 19:50:57 +00002109netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2110 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02002111{
2112 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
Johannes Berg55de9082012-07-26 17:24:39 +02002113 struct ieee80211_chanctx_conf *chanctx_conf;
Johannes Berge2ebc742007-07-27 15:43:22 +02002114 struct ieee80211_radiotap_header *prthdr =
2115 (struct ieee80211_radiotap_header *)skb->data;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002116 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Helmut Schaaf75f5c62011-08-01 11:32:52 +02002117 struct ieee80211_hdr *hdr;
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002118 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
Janusz Dziedzicb4932832014-06-05 08:12:57 +02002119 struct cfg80211_chan_def *chandef;
Andy Green9b8a74e2007-07-27 15:43:24 +02002120 u16 len_rthdr;
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002121 int hdrlen;
Johannes Berge2ebc742007-07-27 15:43:22 +02002122
Andy Green9b8a74e2007-07-27 15:43:24 +02002123 /* check for not even having the fixed radiotap header part */
2124 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2125 goto fail; /* too short to be possibly valid */
2126
2127 /* is it a header version we can trust to find length from? */
2128 if (unlikely(prthdr->it_version))
2129 goto fail; /* only version 0 is supported */
2130
2131 /* then there must be a radiotap header with a length we can use */
2132 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2133
2134 /* does the skb contain enough to deliver on the alleged length? */
2135 if (unlikely(skb->len < len_rthdr))
2136 goto fail; /* skb too short for claimed rt header extent */
Johannes Berge2ebc742007-07-27 15:43:22 +02002137
Johannes Berge2ebc742007-07-27 15:43:22 +02002138 /*
2139 * fix up the pointers accounting for the radiotap
2140 * header still being in there. We are being given
2141 * a precooked IEEE80211 header so no need for
2142 * normal processing
2143 */
Andy Green9b8a74e2007-07-27 15:43:24 +02002144 skb_set_mac_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02002145 /*
Andy Green9b8a74e2007-07-27 15:43:24 +02002146 * these are just fixed to the end of the rt area since we
2147 * don't have any better information and at this point, nobody cares
Johannes Berge2ebc742007-07-27 15:43:22 +02002148 */
Andy Green9b8a74e2007-07-27 15:43:24 +02002149 skb_set_network_header(skb, len_rthdr);
2150 skb_set_transport_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02002151
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002152 if (skb->len < len_rthdr + 2)
2153 goto fail;
2154
2155 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2156 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2157
2158 if (skb->len < len_rthdr + hdrlen)
2159 goto fail;
2160
Helmut Schaaf75f5c62011-08-01 11:32:52 +02002161 /*
2162 * Initialize skb->protocol if the injected frame is a data frame
2163 * carrying a rfc1042 header
2164 */
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002165 if (ieee80211_is_data(hdr->frame_control) &&
2166 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2167 u8 *payload = (u8 *)hdr + hdrlen;
2168
Joe Perchesb203ca32012-05-08 18:56:52 +00002169 if (ether_addr_equal(payload, rfc1042_header))
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002170 skb->protocol = cpu_to_be16((payload[6] << 8) |
2171 payload[7]);
Helmut Schaaf75f5c62011-08-01 11:32:52 +02002172 }
2173
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002174 memset(info, 0, sizeof(*info));
2175
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002176 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
Johannes Berg73b9f032011-10-07 14:01:26 +02002177 IEEE80211_TX_CTL_INJECTED;
2178
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002179 rcu_read_lock();
2180
2181 /*
2182 * We process outgoing injected frames that have a local address
2183 * we handle as though they are non-injected frames.
2184 * This code here isn't entirely correct, the local MAC address
2185 * isn't always enough to find the interface to use; for proper
2186 * VLAN/WDS support we will need a different mechanism (which
2187 * likely isn't going to be monitor interfaces).
2188 */
2189 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2190
2191 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2192 if (!ieee80211_sdata_running(tmp_sdata))
2193 continue;
2194 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2195 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2196 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2197 continue;
Joe Perchesb203ca32012-05-08 18:56:52 +00002198 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002199 sdata = tmp_sdata;
2200 break;
2201 }
2202 }
Johannes Berg7351c6b2009-11-19 01:08:30 +01002203
Johannes Berg55de9082012-07-26 17:24:39 +02002204 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2205 if (!chanctx_conf) {
2206 tmp_sdata = rcu_dereference(local->monitor_sdata);
2207 if (tmp_sdata)
2208 chanctx_conf =
2209 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2210 }
Johannes Berg55de9082012-07-26 17:24:39 +02002211
Felix Fietkaub4a7ff72013-01-13 23:10:26 +01002212 if (chanctx_conf)
Janusz Dziedzicb4932832014-06-05 08:12:57 +02002213 chandef = &chanctx_conf->def;
Felix Fietkaub4a7ff72013-01-13 23:10:26 +01002214 else if (!local->use_chanctx)
Janusz Dziedzicb4932832014-06-05 08:12:57 +02002215 chandef = &local->_oper_chandef;
Felix Fietkaub4a7ff72013-01-13 23:10:26 +01002216 else
2217 goto fail_rcu;
Johannes Berg55de9082012-07-26 17:24:39 +02002218
2219 /*
2220 * Frame injection is not allowed if beaconing is not allowed
2221 * or if we need radar detection. Beaconing is usually not allowed when
2222 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2223 * Passive scan is also used in world regulatory domains where
2224 * your country is not known and as such it should be treated as
2225 * NO TX unless the channel is explicitly allowed in which case
2226 * your current regulatory domain would not have the passive scan
2227 * flag.
2228 *
2229 * Since AP mode uses monitor interfaces to inject/TX management
2230 * frames we can make AP mode the exception to this rule once it
2231 * supports radar detection as its implementation can deal with
2232 * radar detection by itself. We can do that later by adding a
2233 * monitor flag interfaces used for AP support.
2234 */
Janusz Dziedzicb4932832014-06-05 08:12:57 +02002235 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2236 sdata->vif.type))
Johannes Berg55de9082012-07-26 17:24:39 +02002237 goto fail_rcu;
2238
Johannes Berg73c4e192014-11-09 18:50:09 +02002239 info->band = chandef->chan->band;
Lorenzo Bianconi109843b02016-02-19 12:18:01 +01002240
2241 /* process and remove the injection radiotap header */
2242 if (!ieee80211_parse_tx_radiotap(local, skb))
2243 goto fail_rcu;
2244
Johannes Berg7c107702015-03-20 14:18:27 +01002245 ieee80211_xmit(sdata, NULL, skb);
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02002246 rcu_read_unlock();
2247
Johannes Berge2ebc742007-07-27 15:43:22 +02002248 return NETDEV_TX_OK;
Andy Green9b8a74e2007-07-27 15:43:24 +02002249
Johannes Berg55de9082012-07-26 17:24:39 +02002250fail_rcu:
2251 rcu_read_unlock();
Andy Green9b8a74e2007-07-27 15:43:24 +02002252fail:
2253 dev_kfree_skb(skb);
2254 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
Johannes Berge2ebc742007-07-27 15:43:22 +02002255}
2256
Johannes Berg97ffe752015-03-21 09:13:45 +01002257static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
Matti Gottliebad38bfc2013-11-18 19:06:45 +02002258{
Johannes Berg97ffe752015-03-21 09:13:45 +01002259 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
Matti Gottliebad38bfc2013-11-18 19:06:45 +02002260
Johannes Berg97ffe752015-03-21 09:13:45 +01002261 return ethertype == ETH_P_TDLS &&
2262 skb->len > 14 &&
2263 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2264}
2265
2266static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2267 struct sk_buff *skb,
2268 struct sta_info **sta_out)
2269{
2270 struct sta_info *sta;
2271
2272 switch (sdata->vif.type) {
2273 case NL80211_IFTYPE_AP_VLAN:
2274 sta = rcu_dereference(sdata->u.vlan.sta);
2275 if (sta) {
2276 *sta_out = sta;
2277 return 0;
2278 } else if (sdata->wdev.use_4addr) {
2279 return -ENOLINK;
2280 }
2281 /* fall through */
2282 case NL80211_IFTYPE_AP:
2283 case NL80211_IFTYPE_OCB:
2284 case NL80211_IFTYPE_ADHOC:
2285 if (is_multicast_ether_addr(skb->data)) {
2286 *sta_out = ERR_PTR(-ENOENT);
2287 return 0;
2288 }
2289 sta = sta_info_get_bss(sdata, skb->data);
2290 break;
2291 case NL80211_IFTYPE_WDS:
2292 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2293 break;
2294#ifdef CONFIG_MAC80211_MESH
2295 case NL80211_IFTYPE_MESH_POINT:
2296 /* determined much later */
2297 *sta_out = NULL;
2298 return 0;
2299#endif
2300 case NL80211_IFTYPE_STATION:
2301 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2302 sta = sta_info_get(sdata, skb->data);
Johannes Berg11d62ca2016-09-13 08:28:22 +02002303 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2304 if (test_sta_flag(sta,
2305 WLAN_STA_TDLS_PEER_AUTH)) {
Johannes Berg97ffe752015-03-21 09:13:45 +01002306 *sta_out = sta;
2307 return 0;
2308 }
2309
2310 /*
2311 * TDLS link during setup - throw out frames to
2312 * peer. Allow TDLS-setup frames to unauthorized
2313 * peers for the special case of a link teardown
2314 * after a TDLS sta is removed due to being
2315 * unreachable.
2316 */
Johannes Berg11d62ca2016-09-13 08:28:22 +02002317 if (!ieee80211_is_tdls_setup(skb))
Johannes Berg97ffe752015-03-21 09:13:45 +01002318 return -EINVAL;
2319 }
2320
2321 }
2322
2323 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2324 if (!sta)
2325 return -ENOLINK;
2326 break;
2327 default:
2328 return -EINVAL;
2329 }
2330
2331 *sta_out = sta ?: ERR_PTR(-ENOENT);
2332 return 0;
Matti Gottliebad38bfc2013-11-18 19:06:45 +02002333}
2334
Johannes Berge2ebc742007-07-27 15:43:22 +02002335/**
Johannes Berg4c9451e2014-11-09 18:50:10 +02002336 * ieee80211_build_hdr - build 802.11 header in the given frame
2337 * @sdata: virtual interface to build the header for
2338 * @skb: the skb to build the header in
Liad Kaufman24d342c2014-11-09 18:50:07 +02002339 * @info_flags: skb flags to set
Johannes Berge2ebc742007-07-27 15:43:22 +02002340 *
Johannes Berg4c9451e2014-11-09 18:50:10 +02002341 * This function takes the skb with 802.3 header and reformats the header to
2342 * the appropriate IEEE 802.11 header based on which interface the packet is
2343 * being transmitted on.
Johannes Berge2ebc742007-07-27 15:43:22 +02002344 *
Johannes Berg4c9451e2014-11-09 18:50:10 +02002345 * Note that this function also takes care of the TX status request and
2346 * potential unsharing of the SKB - this needs to be interleaved with the
2347 * header building.
2348 *
2349 * The function requires the read-side RCU lock held
2350 *
2351 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
Johannes Berge2ebc742007-07-27 15:43:22 +02002352 */
Johannes Berg4c9451e2014-11-09 18:50:10 +02002353static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
Johannes Berg7c107702015-03-20 14:18:27 +01002354 struct sk_buff *skb, u32 info_flags,
Johannes Berg97ffe752015-03-21 09:13:45 +01002355 struct sta_info *sta)
Johannes Berge2ebc742007-07-27 15:43:22 +02002356{
Johannes Berg133b8222008-09-16 14:18:59 +02002357 struct ieee80211_local *local = sdata->local;
Felix Fietkau489ee912010-12-18 19:30:48 +01002358 struct ieee80211_tx_info *info;
Johannes Bergdcf33962012-07-30 15:11:56 +02002359 int head_need;
Harvey Harrison065e96052008-06-22 16:45:27 -07002360 u16 ethertype, hdrlen, meshhdrlen = 0;
2361 __le16 fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02002362 struct ieee80211_hdr hdr;
Wey-Yi Guyff67bb82010-08-21 07:23:29 -07002363 struct ieee80211s_hdr mesh_hdr __maybe_unused;
Chun-Yeow Yeohb8bacc12012-05-30 09:30:41 +08002364 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +02002365 const u8 *encaps_data;
2366 int encaps_len, skip_header_bytes;
Johannes Berg97ffe752015-03-21 09:13:45 +01002367 bool wme_sta = false, authorized = false;
2368 bool tdls_peer;
Johannes Berga729cff2011-11-06 14:13:34 +01002369 bool multicast;
Johannes Berga729cff2011-11-06 14:13:34 +01002370 u16 info_id = 0;
Johannes Berg55de9082012-07-26 17:24:39 +02002371 struct ieee80211_chanctx_conf *chanctx_conf;
2372 struct ieee80211_sub_if_data *ap_sdata;
Johannes Berg57fbcce2016-04-12 15:56:15 +02002373 enum nl80211_band band;
Johannes Berg4c9451e2014-11-09 18:50:10 +02002374 int ret;
Johannes Berge2ebc742007-07-27 15:43:22 +02002375
Johannes Berg97ffe752015-03-21 09:13:45 +01002376 if (IS_ERR(sta))
2377 sta = NULL;
2378
Johannes Berge2ebc742007-07-27 15:43:22 +02002379 /* convert Ethernet header to proper 802.11 header (based on
2380 * operation mode) */
2381 ethertype = (skb->data[12] << 8) | skb->data[13];
Harvey Harrison065e96052008-06-22 16:45:27 -07002382 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
Johannes Berge2ebc742007-07-27 15:43:22 +02002383
Johannes Berg51fb61e2007-12-19 01:31:27 +01002384 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02002385 case NL80211_IFTYPE_AP_VLAN:
Johannes Berg97ffe752015-03-21 09:13:45 +01002386 if (sdata->wdev.use_4addr) {
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002387 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2388 /* RA TA DA SA */
2389 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002390 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002391 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2392 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2393 hdrlen = 30;
Johannes Bergc2c98fd2011-09-29 16:04:36 +02002394 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
Johannes Berga74a8c82014-07-22 14:50:47 +02002395 wme_sta = sta->sta.wme;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002396 }
Johannes Berg55de9082012-07-26 17:24:39 +02002397 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2398 u.ap);
2399 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
Johannes Berg4c9451e2014-11-09 18:50:10 +02002400 if (!chanctx_conf) {
2401 ret = -ENOTCONN;
2402 goto free;
2403 }
Johannes Berg4bf88532012-11-09 11:39:59 +01002404 band = chanctx_conf->def.chan->band;
Johannes Berg97ffe752015-03-21 09:13:45 +01002405 if (sdata->wdev.use_4addr)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002406 break;
2407 /* fall through */
2408 case NL80211_IFTYPE_AP:
Arnd Bergmannfe801232013-01-25 14:14:33 +00002409 if (sdata->vif.type == NL80211_IFTYPE_AP)
2410 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berg4c9451e2014-11-09 18:50:10 +02002411 if (!chanctx_conf) {
2412 ret = -ENOTCONN;
2413 goto free;
2414 }
Harvey Harrison065e96052008-06-22 16:45:27 -07002415 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
Johannes Berge2ebc742007-07-27 15:43:22 +02002416 /* DA BSSID SA */
2417 memcpy(hdr.addr1, skb->data, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002418 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02002419 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2420 hdrlen = 24;
Johannes Berg4bf88532012-11-09 11:39:59 +01002421 band = chanctx_conf->def.chan->band;
Johannes Bergcf966832007-08-28 17:01:54 -04002422 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002423 case NL80211_IFTYPE_WDS:
Harvey Harrison065e96052008-06-22 16:45:27 -07002424 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Johannes Berge2ebc742007-07-27 15:43:22 +02002425 /* RA TA DA SA */
2426 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002427 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02002428 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2429 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2430 hdrlen = 30;
Johannes Berg55de9082012-07-26 17:24:39 +02002431 /*
2432 * This is the exception! WDS style interfaces are prohibited
2433 * when channel contexts are in used so this must be valid
2434 */
Karl Beldan675a0b02013-03-25 16:26:57 +01002435 band = local->hw.conf.chandef.chan->band;
Johannes Bergcf966832007-08-28 17:01:54 -04002436 break;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002437#ifdef CONFIG_MAC80211_MESH
Johannes Berg05c914f2008-09-11 00:01:58 +02002438 case NL80211_IFTYPE_MESH_POINT:
Chun-Yeow Yeohb8bacc12012-05-30 09:30:41 +08002439 if (!is_multicast_ether_addr(skb->data)) {
Chun-Yeow Yeoh163df6c2013-02-19 10:04:50 +08002440 struct sta_info *next_hop;
2441 bool mpp_lookup = true;
2442
Johannes Bergbf7cd942013-02-15 14:40:31 +01002443 mpath = mesh_path_lookup(sdata, skb->data);
Chun-Yeow Yeoh163df6c2013-02-19 10:04:50 +08002444 if (mpath) {
2445 mpp_lookup = false;
2446 next_hop = rcu_dereference(mpath->next_hop);
2447 if (!next_hop ||
2448 !(mpath->flags & (MESH_PATH_ACTIVE |
2449 MESH_PATH_RESOLVING)))
2450 mpp_lookup = true;
2451 }
2452
Henning Roggeab1c7902016-02-03 13:58:37 +01002453 if (mpp_lookup) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002454 mppath = mpp_path_lookup(sdata, skb->data);
Henning Roggeab1c7902016-02-03 13:58:37 +01002455 if (mppath)
2456 mppath->exp_time = jiffies;
2457 }
Chun-Yeow Yeoh163df6c2013-02-19 10:04:50 +08002458
2459 if (mppath && mpath)
Bob Copeland2bdaf382016-02-28 20:03:56 -05002460 mesh_path_del(sdata, mpath->dst);
Chun-Yeow Yeohb8bacc12012-05-30 09:30:41 +08002461 }
YanBo79617de2008-09-22 13:30:32 +08002462
Joel A Fernandesf76b57b2010-12-28 19:28:11 -06002463 /*
Joel A Fernandes9d525012011-01-10 00:44:23 -06002464 * Use address extension if it is a packet from
2465 * another interface or if we know the destination
2466 * is being proxied by a portal (i.e. portal address
2467 * differs from proxied address)
Joel A Fernandesf76b57b2010-12-28 19:28:11 -06002468 */
Joe Perchesb203ca32012-05-08 18:56:52 +00002469 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2470 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
Javier Cardona3c5772a2009-08-10 12:15:48 -07002471 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2472 skb->data, skb->data + ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002473 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2474 NULL, NULL);
YanBo79617de2008-09-22 13:30:32 +08002475 } else {
Thomas Pedersen27f01122012-08-20 11:28:25 -07002476 /* DS -> MBSS (802.11-2012 13.11.3.3).
2477 * For unicast with unknown forwarding information,
2478 * destination might be in the MBSS or if that fails
2479 * forwarded to another mesh gate. In either case
2480 * resolution will be handled in ieee80211_xmit(), so
2481 * leave the original DA. This also works for mcast */
2482 const u8 *mesh_da = skb->data;
YanBo79617de2008-09-22 13:30:32 +08002483
Thomas Pedersen27f01122012-08-20 11:28:25 -07002484 if (mppath)
2485 mesh_da = mppath->mpp;
2486 else if (mpath)
2487 mesh_da = mpath->dst;
Thomas Pedersen27f01122012-08-20 11:28:25 -07002488
Javier Cardona3c5772a2009-08-10 12:15:48 -07002489 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
Johannes Berg47846c92009-11-25 17:46:19 +01002490 mesh_da, sdata->vif.addr);
Thomas Pedersen27f01122012-08-20 11:28:25 -07002491 if (is_multicast_ether_addr(mesh_da))
2492 /* DA TA mSA AE:SA */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002493 meshhdrlen = ieee80211_new_mesh_header(
2494 sdata, &mesh_hdr,
2495 skb->data + ETH_ALEN, NULL);
Javier Cardona3c5772a2009-08-10 12:15:48 -07002496 else
Thomas Pedersen27f01122012-08-20 11:28:25 -07002497 /* RA TA mDA mSA AE:DA SA */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002498 meshhdrlen = ieee80211_new_mesh_header(
2499 sdata, &mesh_hdr, skb->data,
2500 skb->data + ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08002501
YanBo79617de2008-09-22 13:30:32 +08002502 }
Johannes Berg55de9082012-07-26 17:24:39 +02002503 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berg4c9451e2014-11-09 18:50:10 +02002504 if (!chanctx_conf) {
2505 ret = -ENOTCONN;
2506 goto free;
2507 }
Johannes Berg4bf88532012-11-09 11:39:59 +01002508 band = chanctx_conf->def.chan->band;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002509 break;
2510#endif
Johannes Berg05c914f2008-09-11 00:01:58 +02002511 case NL80211_IFTYPE_STATION:
Johannes Berg97ffe752015-03-21 09:13:45 +01002512 /* we already did checks when looking up the RA STA */
2513 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
Arik Nemtsov941c93c2011-09-28 14:12:54 +03002514
Johannes Berg97ffe752015-03-21 09:13:45 +01002515 if (tdls_peer) {
Arik Nemtsov941c93c2011-09-28 14:12:54 +03002516 /* DA SA BSSID */
2517 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2518 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2519 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2520 hdrlen = 24;
2521 } else if (sdata->u.mgd.use_4addr &&
2522 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2523 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2524 IEEE80211_FCTL_TODS);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002525 /* RA TA DA SA */
Arik Nemtsov941c93c2011-09-28 14:12:54 +03002526 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002527 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002528 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2529 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2530 hdrlen = 30;
2531 } else {
2532 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2533 /* BSSID SA DA */
Arik Nemtsov941c93c2011-09-28 14:12:54 +03002534 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002535 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2536 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2537 hdrlen = 24;
2538 }
Johannes Berg55de9082012-07-26 17:24:39 +02002539 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berg4c9451e2014-11-09 18:50:10 +02002540 if (!chanctx_conf) {
2541 ret = -ENOTCONN;
2542 goto free;
2543 }
Johannes Berg4bf88532012-11-09 11:39:59 +01002544 band = chanctx_conf->def.chan->band;
Johannes Bergcf966832007-08-28 17:01:54 -04002545 break;
Rostislav Lisovy239281f2014-11-03 10:33:19 +01002546 case NL80211_IFTYPE_OCB:
2547 /* DA SA BSSID */
2548 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2549 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2550 eth_broadcast_addr(hdr.addr3);
2551 hdrlen = 24;
2552 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berg4c9451e2014-11-09 18:50:10 +02002553 if (!chanctx_conf) {
2554 ret = -ENOTCONN;
2555 goto free;
2556 }
Rostislav Lisovy239281f2014-11-03 10:33:19 +01002557 band = chanctx_conf->def.chan->band;
2558 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02002559 case NL80211_IFTYPE_ADHOC:
Johannes Berge2ebc742007-07-27 15:43:22 +02002560 /* DA SA BSSID */
2561 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2562 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002563 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02002564 hdrlen = 24;
Johannes Berg55de9082012-07-26 17:24:39 +02002565 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berg4c9451e2014-11-09 18:50:10 +02002566 if (!chanctx_conf) {
2567 ret = -ENOTCONN;
2568 goto free;
2569 }
Johannes Berg4bf88532012-11-09 11:39:59 +01002570 band = chanctx_conf->def.chan->band;
Johannes Bergcf966832007-08-28 17:01:54 -04002571 break;
2572 default:
Johannes Berg4c9451e2014-11-09 18:50:10 +02002573 ret = -EINVAL;
2574 goto free;
Johannes Berge2ebc742007-07-27 15:43:22 +02002575 }
2576
Johannes Berga729cff2011-11-06 14:13:34 +01002577 multicast = is_multicast_ether_addr(hdr.addr1);
Johannes Berge2ebc742007-07-27 15:43:22 +02002578
Johannes Berg97ffe752015-03-21 09:13:45 +01002579 /* sta is always NULL for mesh */
2580 if (sta) {
2581 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2582 wme_sta = sta->sta.wme;
2583 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2584 /* For mesh, the use of the QoS header is mandatory */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02002585 wme_sta = true;
Johannes Berge2ebc742007-07-27 15:43:22 +02002586 }
2587
Johannes Berg527871d2015-03-21 08:09:55 +01002588 /* receiver does QoS (which also means we do) use it */
2589 if (wme_sta) {
Harvey Harrison065e96052008-06-22 16:45:27 -07002590 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002591 hdrlen += 2;
2592 }
2593
2594 /*
Johannes Berg238814f2008-01-28 17:19:37 +01002595 * Drop unicast frames to unauthorised stations unless they are
2596 * EAPOL frames from the local station.
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002597 */
Johannes Berg55182e42011-10-12 17:28:21 +02002598 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01002599 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
Sergey Ryazanova6ececf2013-08-30 01:35:09 +04002600 !multicast && !authorized &&
Johannes Berg55182e42011-10-12 17:28:21 +02002601 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
Joe Perchesb203ca32012-05-08 18:56:52 +00002602 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002603#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002604 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
Johannes Berg4c9451e2014-11-09 18:50:10 +02002605 sdata->name, hdr.addr1);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002606#endif
2607
2608 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2609
Johannes Berg4c9451e2014-11-09 18:50:10 +02002610 ret = -EPERM;
2611 goto free;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002612 }
2613
Johannes Berga729cff2011-11-06 14:13:34 +01002614 if (unlikely(!multicast && skb->sk &&
2615 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
Alexander Duyckbf7fa552014-09-10 18:05:42 -04002616 struct sk_buff *ack_skb = skb_clone_sk(skb);
Johannes Berga729cff2011-11-06 14:13:34 +01002617
Alexander Duyckbf7fa552014-09-10 18:05:42 -04002618 if (ack_skb) {
Johannes Berga729cff2011-11-06 14:13:34 +01002619 unsigned long flags;
Tejun Heo9475af62013-02-27 17:04:59 -08002620 int id;
Johannes Berga729cff2011-11-06 14:13:34 +01002621
2622 spin_lock_irqsave(&local->ack_status_lock, flags);
Alexander Duyckbf7fa552014-09-10 18:05:42 -04002623 id = idr_alloc(&local->ack_status_frames, ack_skb,
Tejun Heo9475af62013-02-27 17:04:59 -08002624 1, 0x10000, GFP_ATOMIC);
Johannes Berga729cff2011-11-06 14:13:34 +01002625 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2626
Tejun Heo9475af62013-02-27 17:04:59 -08002627 if (id >= 0) {
Johannes Berga729cff2011-11-06 14:13:34 +01002628 info_id = id;
2629 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
Johannes Berga729cff2011-11-06 14:13:34 +01002630 } else {
Alexander Duyckbf7fa552014-09-10 18:05:42 -04002631 kfree_skb(ack_skb);
Johannes Berga729cff2011-11-06 14:13:34 +01002632 }
Johannes Berga729cff2011-11-06 14:13:34 +01002633 }
2634 }
2635
Helmut Schaa7e244702010-12-02 18:44:09 +01002636 /*
2637 * If the skb is shared we need to obtain our own copy.
2638 */
2639 if (skb_shared(skb)) {
Johannes Berga729cff2011-11-06 14:13:34 +01002640 struct sk_buff *tmp_skb = skb;
2641
2642 /* can't happen -- skb is a clone if info_id != 0 */
2643 WARN_ON(info_id);
2644
Felix Fietkauf8a0a782010-12-18 19:30:50 +01002645 skb = skb_clone(skb, GFP_ATOMIC);
Helmut Schaa7e244702010-12-02 18:44:09 +01002646 kfree_skb(tmp_skb);
2647
Johannes Berg4c9451e2014-11-09 18:50:10 +02002648 if (!skb) {
2649 ret = -ENOMEM;
2650 goto free;
2651 }
Helmut Schaa7e244702010-12-02 18:44:09 +01002652 }
2653
Harvey Harrison065e96052008-06-22 16:45:27 -07002654 hdr.frame_control = fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02002655 hdr.duration_id = 0;
2656 hdr.seq_ctrl = 0;
2657
2658 skip_header_bytes = ETH_HLEN;
2659 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2660 encaps_data = bridge_tunnel_header;
2661 encaps_len = sizeof(bridge_tunnel_header);
2662 skip_header_bytes -= 2;
Simon Hormane5c5d222013-03-28 13:38:25 +09002663 } else if (ethertype >= ETH_P_802_3_MIN) {
Johannes Berge2ebc742007-07-27 15:43:22 +02002664 encaps_data = rfc1042_header;
2665 encaps_len = sizeof(rfc1042_header);
2666 skip_header_bytes -= 2;
2667 } else {
2668 encaps_data = NULL;
2669 encaps_len = 0;
2670 }
2671
2672 skb_pull(skb, skip_header_bytes);
Johannes Berg23c07522008-05-29 10:38:53 +02002673 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02002674
Johannes Berg23c07522008-05-29 10:38:53 +02002675 /*
2676 * So we need to modify the skb header and hence need a copy of
2677 * that. The head_need variable above doesn't, so far, include
2678 * the needed header space that we don't need right away. If we
2679 * can, then we don't reallocate right now but only after the
2680 * frame arrives at the master device (if it does...)
2681 *
2682 * If we cannot, however, then we will reallocate to include all
2683 * the ever needed space. Also, if we need to reallocate it anyway,
2684 * make it big enough for everything we may ever need.
2685 */
Johannes Berge2ebc742007-07-27 15:43:22 +02002686
David S. Miller3a5be7d2008-06-18 01:19:51 -07002687 if (head_need > 0 || skb_cloned(skb)) {
Max Stepanov2475b1cc2013-03-24 14:23:27 +02002688 head_need += sdata->encrypt_headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02002689 head_need += local->tx_headroom;
2690 head_need = max_t(int, 0, head_need);
Felix Fietkauc3e77242012-10-08 14:39:33 +02002691 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2692 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg1c963be2012-11-07 14:02:30 +01002693 skb = NULL;
Johannes Berg4c9451e2014-11-09 18:50:10 +02002694 return ERR_PTR(-ENOMEM);
Felix Fietkauc3e77242012-10-08 14:39:33 +02002695 }
Johannes Berge2ebc742007-07-27 15:43:22 +02002696 }
2697
Felix Fietkaueae44302016-07-13 11:00:02 +02002698 if (encaps_data)
Johannes Berge2ebc742007-07-27 15:43:22 +02002699 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
Johannes Bergc29b9b92007-09-14 11:10:24 -04002700
Yuri Ershove4ab7eb2010-06-29 15:08:06 +04002701#ifdef CONFIG_MAC80211_MESH
Felix Fietkaueae44302016-07-13 11:00:02 +02002702 if (meshhdrlen > 0)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002703 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
Yuri Ershove4ab7eb2010-06-29 15:08:06 +04002704#endif
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002705
Harvey Harrison065e96052008-06-22 16:45:27 -07002706 if (ieee80211_is_data_qos(fc)) {
Johannes Bergc29b9b92007-09-14 11:10:24 -04002707 __le16 *qos_control;
2708
Weilong Chenf359d3f2013-12-18 15:44:16 +08002709 qos_control = (__le16 *) skb_push(skb, 2);
Johannes Bergc29b9b92007-09-14 11:10:24 -04002710 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2711 /*
2712 * Maybe we could actually set some fields here, for now just
2713 * initialise to zero to indicate no special operation.
2714 */
2715 *qos_control = 0;
2716 } else
2717 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2718
Zhang Shengjud57a5442016-03-03 01:16:56 +00002719 skb_reset_mac_header(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02002720
Felix Fietkau489ee912010-12-18 19:30:48 +01002721 info = IEEE80211_SKB_CB(skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002722 memset(info, 0, sizeof(*info));
2723
Johannes Berga729cff2011-11-06 14:13:34 +01002724 info->flags = info_flags;
2725 info->ack_frame_id = info_id;
Johannes Berg73c4e192014-11-09 18:50:09 +02002726 info->band = band;
Johannes Berga729cff2011-11-06 14:13:34 +01002727
Johannes Berg4c9451e2014-11-09 18:50:10 +02002728 return skb;
2729 free:
2730 kfree_skb(skb);
2731 return ERR_PTR(ret);
Johannes Berge2ebc742007-07-27 15:43:22 +02002732}
2733
Johannes Berg17c18bf2015-03-21 15:25:43 +01002734/*
2735 * fast-xmit overview
2736 *
2737 * The core idea of this fast-xmit is to remove per-packet checks by checking
2738 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2739 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2740 * much less work can be done per packet. For example, fragmentation must be
2741 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2742 * in the code here.
2743 *
2744 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2745 * header and other data to aid packet processing in ieee80211_xmit_fast().
2746 *
2747 * The most difficult part of this is that when any of these assumptions
2748 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2749 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2750 * since the per-packet code no longer checks the conditions. This is reflected
2751 * by the calls to these functions throughout the rest of the code, and must be
2752 * maintained if any of the TX path checks change.
2753 */
2754
2755void ieee80211_check_fast_xmit(struct sta_info *sta)
2756{
2757 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2758 struct ieee80211_local *local = sta->local;
2759 struct ieee80211_sub_if_data *sdata = sta->sdata;
2760 struct ieee80211_hdr *hdr = (void *)build.hdr;
2761 struct ieee80211_chanctx_conf *chanctx_conf;
2762 __le16 fc;
2763
Johannes Berg30686bf2015-06-02 21:39:54 +02002764 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
Johannes Berg17c18bf2015-03-21 15:25:43 +01002765 return;
2766
2767 /* Locking here protects both the pointer itself, and against concurrent
2768 * invocations winning data access races to, e.g., the key pointer that
2769 * is used.
2770 * Without it, the invocation of this function right after the key
2771 * pointer changes wouldn't be sufficient, as another CPU could access
2772 * the pointer, then stall, and then do the cache update after the CPU
2773 * that invalidated the key.
2774 * With the locking, such scenarios cannot happen as the check for the
2775 * key and the fast-tx assignment are done atomically, so the CPU that
2776 * modifies the key will either wait or other one will see the key
2777 * cleared/changed already.
2778 */
2779 spin_lock_bh(&sta->lock);
Johannes Berg30686bf2015-06-02 21:39:54 +02002780 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2781 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
Johannes Berg17c18bf2015-03-21 15:25:43 +01002782 sdata->vif.type == NL80211_IFTYPE_STATION)
2783 goto out;
2784
2785 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2786 goto out;
2787
2788 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2789 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
Felix Fietkauf7418bc2015-09-24 14:59:49 +02002790 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2791 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
Johannes Berg17c18bf2015-03-21 15:25:43 +01002792 goto out;
2793
2794 if (sdata->noack_map)
2795 goto out;
2796
2797 /* fast-xmit doesn't handle fragmentation at all */
Johannes Berg725b8122015-04-10 14:02:08 +02002798 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2799 !local->ops->set_frag_threshold)
Johannes Berg17c18bf2015-03-21 15:25:43 +01002800 goto out;
2801
2802 rcu_read_lock();
2803 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2804 if (!chanctx_conf) {
2805 rcu_read_unlock();
2806 goto out;
2807 }
2808 build.band = chanctx_conf->def.chan->band;
2809 rcu_read_unlock();
2810
2811 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2812
2813 switch (sdata->vif.type) {
Johannes Berg3ffd8842015-04-14 10:28:37 +02002814 case NL80211_IFTYPE_ADHOC:
2815 /* DA SA BSSID */
2816 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2817 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2818 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2819 build.hdr_len = 24;
2820 break;
Johannes Berg17c18bf2015-03-21 15:25:43 +01002821 case NL80211_IFTYPE_STATION:
2822 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2823 /* DA SA BSSID */
2824 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2825 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2826 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2827 build.hdr_len = 24;
2828 break;
2829 }
2830
2831 if (sdata->u.mgd.use_4addr) {
2832 /* non-regular ethertype cannot use the fastpath */
2833 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2834 IEEE80211_FCTL_TODS);
2835 /* RA TA DA SA */
2836 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2837 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2838 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2839 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2840 build.hdr_len = 30;
2841 break;
2842 }
2843 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2844 /* BSSID SA DA */
2845 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2846 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2847 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2848 build.hdr_len = 24;
2849 break;
2850 case NL80211_IFTYPE_AP_VLAN:
2851 if (sdata->wdev.use_4addr) {
2852 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2853 IEEE80211_FCTL_TODS);
2854 /* RA TA DA SA */
2855 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2856 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2857 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2858 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2859 build.hdr_len = 30;
2860 break;
2861 }
2862 /* fall through */
2863 case NL80211_IFTYPE_AP:
2864 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2865 /* DA BSSID SA */
2866 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2867 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2868 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2869 build.hdr_len = 24;
2870 break;
2871 default:
2872 /* not handled on fast-xmit */
2873 goto out;
2874 }
2875
2876 if (sta->sta.wme) {
2877 build.hdr_len += 2;
2878 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2879 }
2880
2881 /* We store the key here so there's no point in using rcu_dereference()
2882 * but that's fine because the code that changes the pointers will call
2883 * this function after doing so. For a single CPU that would be enough,
2884 * for multiple see the comment above.
2885 */
2886 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2887 if (!build.key)
2888 build.key = rcu_access_pointer(sdata->default_unicast_key);
2889 if (build.key) {
Johannes Berge495c242015-04-10 14:03:17 +02002890 bool gen_iv, iv_spc, mmic;
Johannes Berg17c18bf2015-03-21 15:25:43 +01002891
2892 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2893 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
Johannes Berge495c242015-04-10 14:03:17 +02002894 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
Johannes Berg17c18bf2015-03-21 15:25:43 +01002895
2896 /* don't handle software crypto */
2897 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2898 goto out;
2899
2900 switch (build.key->conf.cipher) {
2901 case WLAN_CIPHER_SUITE_CCMP:
2902 case WLAN_CIPHER_SUITE_CCMP_256:
2903 /* add fixed key ID */
2904 if (gen_iv) {
2905 (build.hdr + build.hdr_len)[3] =
2906 0x20 | (build.key->conf.keyidx << 6);
2907 build.pn_offs = build.hdr_len;
2908 }
2909 if (gen_iv || iv_spc)
2910 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2911 break;
2912 case WLAN_CIPHER_SUITE_GCMP:
2913 case WLAN_CIPHER_SUITE_GCMP_256:
2914 /* add fixed key ID */
2915 if (gen_iv) {
2916 (build.hdr + build.hdr_len)[3] =
2917 0x20 | (build.key->conf.keyidx << 6);
2918 build.pn_offs = build.hdr_len;
2919 }
2920 if (gen_iv || iv_spc)
2921 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2922 break;
Johannes Berge495c242015-04-10 14:03:17 +02002923 case WLAN_CIPHER_SUITE_TKIP:
2924 /* cannot handle MMIC or IV generation in xmit-fast */
2925 if (mmic || gen_iv)
2926 goto out;
2927 if (iv_spc)
2928 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2929 break;
2930 case WLAN_CIPHER_SUITE_WEP40:
2931 case WLAN_CIPHER_SUITE_WEP104:
2932 /* cannot handle IV generation in fast-xmit */
2933 if (gen_iv)
2934 goto out;
2935 if (iv_spc)
2936 build.hdr_len += IEEE80211_WEP_IV_LEN;
2937 break;
2938 case WLAN_CIPHER_SUITE_AES_CMAC:
2939 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2940 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2941 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2942 WARN(1,
2943 "management cipher suite 0x%x enabled for data\n",
2944 build.key->conf.cipher);
Johannes Berg17c18bf2015-03-21 15:25:43 +01002945 goto out;
Johannes Berge495c242015-04-10 14:03:17 +02002946 default:
2947 /* we don't know how to generate IVs for this at all */
2948 if (WARN_ON(gen_iv))
2949 goto out;
2950 /* pure hardware keys are OK, of course */
2951 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2952 break;
2953 /* cipher scheme might require space allocation */
2954 if (iv_spc &&
2955 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2956 goto out;
2957 if (iv_spc)
2958 build.hdr_len += build.key->conf.iv_len;
Johannes Berg17c18bf2015-03-21 15:25:43 +01002959 }
2960
2961 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2962 }
2963
2964 hdr->frame_control = fc;
2965
2966 memcpy(build.hdr + build.hdr_len,
2967 rfc1042_header, sizeof(rfc1042_header));
2968 build.hdr_len += sizeof(rfc1042_header);
2969
2970 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2971 /* if the kmemdup fails, continue w/o fast_tx */
2972 if (!fast_tx)
2973 goto out;
2974
2975 out:
2976 /* we might have raced against another call to this function */
2977 old = rcu_dereference_protected(sta->fast_tx,
2978 lockdep_is_held(&sta->lock));
2979 rcu_assign_pointer(sta->fast_tx, fast_tx);
2980 if (old)
2981 kfree_rcu(old, rcu_head);
2982 spin_unlock_bh(&sta->lock);
2983}
2984
2985void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2986{
2987 struct sta_info *sta;
2988
2989 rcu_read_lock();
2990 list_for_each_entry_rcu(sta, &local->sta_list, list)
2991 ieee80211_check_fast_xmit(sta);
2992 rcu_read_unlock();
2993}
2994
2995void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2996{
2997 struct ieee80211_local *local = sdata->local;
2998 struct sta_info *sta;
2999
3000 rcu_read_lock();
3001
3002 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3003 if (sdata != sta->sdata &&
3004 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3005 continue;
3006 ieee80211_check_fast_xmit(sta);
3007 }
3008
3009 rcu_read_unlock();
3010}
3011
3012void ieee80211_clear_fast_xmit(struct sta_info *sta)
3013{
3014 struct ieee80211_fast_tx *fast_tx;
3015
3016 spin_lock_bh(&sta->lock);
3017 fast_tx = rcu_dereference_protected(sta->fast_tx,
3018 lockdep_is_held(&sta->lock));
3019 RCU_INIT_POINTER(sta->fast_tx, NULL);
3020 spin_unlock_bh(&sta->lock);
3021
3022 if (fast_tx)
3023 kfree_rcu(fast_tx, rcu_head);
3024}
3025
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003026static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3027 struct sk_buff *skb, int headroom,
3028 int *subframe_len)
3029{
3030 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3031 int padding = (4 - amsdu_len) & 3;
3032
3033 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3034 I802_DEBUG_INC(local->tx_expand_skb_head);
3035
3036 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3037 wiphy_debug(local->hw.wiphy,
3038 "failed to reallocate TX buffer\n");
3039 return false;
3040 }
3041 }
3042
3043 if (padding) {
3044 *subframe_len += padding;
3045 memset(skb_put(skb, padding), 0, padding);
3046 }
3047
3048 return true;
3049}
3050
3051static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3052 struct ieee80211_fast_tx *fast_tx,
3053 struct sk_buff *skb)
3054{
3055 struct ieee80211_local *local = sdata->local;
3056 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3057 struct ieee80211_hdr *hdr;
3058 struct ethhdr amsdu_hdr;
3059 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3060 int subframe_len = skb->len - hdr_len;
3061 void *data;
3062 u8 *qc;
3063
3064 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3065 return false;
3066
3067 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3068 return true;
3069
3070 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr),
3071 &subframe_len))
3072 return false;
3073
3074 amsdu_hdr.h_proto = cpu_to_be16(subframe_len);
3075 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN);
3076 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN);
3077
3078 data = skb_push(skb, sizeof(amsdu_hdr));
3079 memmove(data, data + sizeof(amsdu_hdr), hdr_len);
3080 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
3081
3082 hdr = data;
3083 qc = ieee80211_get_qos_ctl(hdr);
3084 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3085
3086 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3087
3088 return true;
3089}
3090
3091static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3092 struct sta_info *sta,
3093 struct ieee80211_fast_tx *fast_tx,
3094 struct sk_buff *skb)
3095{
3096 struct ieee80211_local *local = sdata->local;
Michal Kaziorfa962b92016-05-19 10:37:49 +02003097 struct fq *fq = &local->fq;
3098 struct fq_tin *tin;
3099 struct fq_flow *flow;
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003100 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3101 struct ieee80211_txq *txq = sta->sta.txq[tid];
3102 struct txq_info *txqi;
3103 struct sk_buff **frag_tail, *head;
3104 int subframe_len = skb->len - ETH_ALEN;
3105 u8 max_subframes = sta->sta.max_amsdu_subframes;
3106 int max_frags = local->hw.max_tx_fragments;
3107 int max_amsdu_len = sta->sta.max_amsdu_len;
3108 __be16 len;
3109 void *data;
3110 bool ret = false;
Michal Kaziorfa962b92016-05-19 10:37:49 +02003111 unsigned int orig_len;
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003112 int n = 1, nfrags;
3113
3114 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3115 return false;
3116
3117 if (!txq)
3118 return false;
3119
3120 txqi = to_txq_info(txq);
3121 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3122 return false;
3123
3124 if (sta->sta.max_rc_amsdu_len)
3125 max_amsdu_len = min_t(int, max_amsdu_len,
3126 sta->sta.max_rc_amsdu_len);
3127
Michal Kaziorfa962b92016-05-19 10:37:49 +02003128 spin_lock_bh(&fq->lock);
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003129
Michal Kaziorfa962b92016-05-19 10:37:49 +02003130 /* TODO: Ideally aggregation should be done on dequeue to remain
3131 * responsive to environment changes.
3132 */
3133
3134 tin = &txqi->tin;
3135 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3136 head = skb_peek_tail(&flow->queue);
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003137 if (!head)
3138 goto out;
3139
Michal Kaziorfa962b92016-05-19 10:37:49 +02003140 orig_len = head->len;
3141
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003142 if (skb->len + head->len > max_amsdu_len)
3143 goto out;
3144
3145 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3146 goto out;
3147
3148 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3149 nfrags += 1 + skb_shinfo(head)->nr_frags;
3150 frag_tail = &skb_shinfo(head)->frag_list;
3151 while (*frag_tail) {
3152 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3153 frag_tail = &(*frag_tail)->next;
3154 n++;
3155 }
3156
3157 if (max_subframes && n > max_subframes)
3158 goto out;
3159
3160 if (max_frags && nfrags > max_frags)
3161 goto out;
3162
3163 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3164 &subframe_len))
3165 goto out;
3166
3167 ret = true;
3168 data = skb_push(skb, ETH_ALEN + 2);
3169 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3170
3171 data += 2 * ETH_ALEN;
3172 len = cpu_to_be16(subframe_len);
3173 memcpy(data, &len, 2);
3174 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3175
3176 head->len += skb->len;
3177 head->data_len += skb->len;
3178 *frag_tail = skb;
3179
Michal Kaziorfa962b92016-05-19 10:37:49 +02003180 flow->backlog += head->len - orig_len;
3181 tin->backlog_bytes += head->len - orig_len;
3182
3183 fq_recalc_backlog(fq, tin, flow);
3184
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003185out:
Michal Kaziorfa962b92016-05-19 10:37:49 +02003186 spin_unlock_bh(&fq->lock);
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003187
3188 return ret;
3189}
3190
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003191/*
3192 * Can be called while the sta lock is held. Anything that can cause packets to
3193 * be generated will cause deadlock!
3194 */
3195static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3196 struct sta_info *sta, u8 pn_offs,
3197 struct ieee80211_key *key,
3198 struct sk_buff *skb)
3199{
3200 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3201 struct ieee80211_hdr *hdr = (void *)skb->data;
3202 u8 tid = IEEE80211_NUM_TIDS;
3203
3204 if (key)
3205 info->control.hw_key = &key->conf;
3206
3207 ieee80211_tx_stats(skb->dev, skb->len);
3208
3209 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3210 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003211 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3212 } else {
3213 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3214 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3215 sdata->sequence_number += 0x10;
3216 }
3217
3218 if (skb_shinfo(skb)->gso_size)
3219 sta->tx_stats.msdu[tid] +=
3220 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3221 else
3222 sta->tx_stats.msdu[tid]++;
3223
3224 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3225
3226 /* statistics normally done by ieee80211_tx_h_stats (but that
3227 * has to consider fragmentation, so is more complex)
3228 */
3229 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3230 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3231
3232 if (pn_offs) {
3233 u64 pn;
3234 u8 *crypto_hdr = skb->data + pn_offs;
3235
3236 switch (key->conf.cipher) {
3237 case WLAN_CIPHER_SUITE_CCMP:
3238 case WLAN_CIPHER_SUITE_CCMP_256:
3239 case WLAN_CIPHER_SUITE_GCMP:
3240 case WLAN_CIPHER_SUITE_GCMP_256:
3241 pn = atomic64_inc_return(&key->conf.tx_pn);
3242 crypto_hdr[0] = pn;
3243 crypto_hdr[1] = pn >> 8;
3244 crypto_hdr[4] = pn >> 16;
3245 crypto_hdr[5] = pn >> 24;
3246 crypto_hdr[6] = pn >> 32;
3247 crypto_hdr[7] = pn >> 40;
3248 break;
3249 }
3250 }
3251}
3252
Johannes Berg17c18bf2015-03-21 15:25:43 +01003253static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003254 struct sta_info *sta,
Johannes Berg17c18bf2015-03-21 15:25:43 +01003255 struct ieee80211_fast_tx *fast_tx,
3256 struct sk_buff *skb)
3257{
3258 struct ieee80211_local *local = sdata->local;
3259 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3260 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3261 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3262 struct ethhdr eth;
Johannes Berg5e7598a2017-01-02 11:19:29 +01003263 struct ieee80211_tx_info *info;
Johannes Berg17c18bf2015-03-21 15:25:43 +01003264 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3265 struct ieee80211_tx_data tx;
3266 ieee80211_tx_result r;
3267 struct tid_ampdu_tx *tid_tx = NULL;
3268 u8 tid = IEEE80211_NUM_TIDS;
3269
3270 /* control port protocol needs a lot of special handling */
3271 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3272 return false;
3273
3274 /* only RFC 1042 SNAP */
3275 if (ethertype < ETH_P_802_3_MIN)
3276 return false;
3277
3278 /* don't handle TX status request here either */
3279 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3280 return false;
3281
3282 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3283 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3284 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
Johannes Berg472be002015-06-09 16:45:08 +02003285 if (tid_tx) {
3286 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3287 return false;
3288 if (tid_tx->timeout)
3289 tid_tx->last_tx = jiffies;
3290 }
Johannes Berg17c18bf2015-03-21 15:25:43 +01003291 }
3292
3293 /* after this point (skb is modified) we cannot return false */
3294
3295 if (skb_shared(skb)) {
3296 struct sk_buff *tmp_skb = skb;
3297
3298 skb = skb_clone(skb, GFP_ATOMIC);
3299 kfree_skb(tmp_skb);
3300
3301 if (!skb)
3302 return true;
3303 }
3304
Felix Fietkau6e0456b2016-03-03 22:59:00 +01003305 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3306 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3307 return true;
3308
Johannes Berg17c18bf2015-03-21 15:25:43 +01003309 /* will not be crypto-handled beyond what we do here, so use false
3310 * as the may-encrypt argument for the resize to not account for
3311 * more room than we already have in 'extra_head'
3312 */
3313 if (unlikely(ieee80211_skb_resize(sdata, skb,
3314 max_t(int, extra_head + hw_headroom -
3315 skb_headroom(skb), 0),
3316 false))) {
3317 kfree_skb(skb);
3318 return true;
3319 }
3320
3321 memcpy(&eth, skb->data, ETH_HLEN - 2);
3322 hdr = (void *)skb_push(skb, extra_head);
3323 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3324 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3325 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3326
Johannes Berg5e7598a2017-01-02 11:19:29 +01003327 info = IEEE80211_SKB_CB(skb);
Johannes Berg17c18bf2015-03-21 15:25:43 +01003328 memset(info, 0, sizeof(*info));
3329 info->band = fast_tx->band;
3330 info->control.vif = &sdata->vif;
3331 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3332 IEEE80211_TX_CTL_DONTFRAG |
3333 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003334 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
Johannes Berg17c18bf2015-03-21 15:25:43 +01003335
Felix Fietkaua786f962016-11-04 10:27:54 +01003336 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3337 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3338 *ieee80211_get_qos_ctl(hdr) = tid;
3339 }
3340
Johannes Berg17c18bf2015-03-21 15:25:43 +01003341 __skb_queue_head_init(&tx.skbs);
3342
3343 tx.flags = IEEE80211_TX_UNICAST;
3344 tx.local = local;
3345 tx.sdata = sdata;
3346 tx.sta = sta;
3347 tx.key = fast_tx->key;
3348
Johannes Berg30686bf2015-06-02 21:39:54 +02003349 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
Johannes Berg17c18bf2015-03-21 15:25:43 +01003350 tx.skb = skb;
3351 r = ieee80211_tx_h_rate_ctrl(&tx);
3352 skb = tx.skb;
3353 tx.skb = NULL;
3354
3355 if (r != TX_CONTINUE) {
3356 if (r != TX_QUEUED)
3357 kfree_skb(skb);
3358 return true;
3359 }
3360 }
3361
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003362 if (ieee80211_queue_skb(local, sdata, sta, skb))
3363 return true;
Johannes Berg17c18bf2015-03-21 15:25:43 +01003364
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003365 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3366 fast_tx->key, skb);
Johannes Berg17c18bf2015-03-21 15:25:43 +01003367
3368 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3369 sdata = container_of(sdata->bss,
3370 struct ieee80211_sub_if_data, u.ap);
3371
3372 __skb_queue_tail(&tx.skbs, skb);
3373 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3374 return true;
3375}
3376
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003377struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3378 struct ieee80211_txq *txq)
3379{
3380 struct ieee80211_local *local = hw_to_local(hw);
3381 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3382 struct ieee80211_hdr *hdr;
3383 struct sk_buff *skb = NULL;
3384 struct fq *fq = &local->fq;
3385 struct fq_tin *tin = &txqi->tin;
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003386 struct ieee80211_tx_info *info;
3387 struct ieee80211_tx_data tx;
3388 ieee80211_tx_result r;
Johannes Berg59862b02017-06-22 12:20:30 +02003389 struct ieee80211_vif *vif;
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003390
3391 spin_lock_bh(&fq->lock);
3392
3393 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3394 goto out;
3395
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003396 /* Make sure fragments stay together. */
3397 skb = __skb_dequeue(&txqi->frags);
3398 if (skb)
3399 goto out;
3400
3401begin:
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003402 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3403 if (!skb)
3404 goto out;
3405
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003406 hdr = (struct ieee80211_hdr *)skb->data;
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003407 info = IEEE80211_SKB_CB(skb);
3408
3409 memset(&tx, 0, sizeof(tx));
3410 __skb_queue_head_init(&tx.skbs);
3411 tx.local = local;
3412 tx.skb = skb;
3413 tx.sdata = vif_to_sdata(info->control.vif);
3414
3415 if (txq->sta)
3416 tx.sta = container_of(txq->sta, struct sta_info, sta);
3417
3418 /*
3419 * The key can be removed while the packet was queued, so need to call
3420 * this here to get the current key.
3421 */
3422 r = ieee80211_tx_h_select_key(&tx);
3423 if (r != TX_CONTINUE) {
3424 ieee80211_free_txskb(&local->hw, skb);
3425 goto begin;
3426 }
3427
Felix Fietkauc1f4c9e2016-11-04 10:27:52 +01003428 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3429 info->flags |= IEEE80211_TX_CTL_AMPDU;
3430 else
3431 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3432
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003433 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003434 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3435 sta);
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003436 u8 pn_offs = 0;
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003437
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003438 if (tx.key &&
3439 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3440 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3441
3442 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3443 tx.key, skb);
3444 } else {
3445 if (invoke_tx_handlers_late(&tx))
3446 goto begin;
3447
3448 skb = __skb_dequeue(&tx.skbs);
3449
3450 if (!skb_queue_empty(&tx.skbs))
3451 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003452 }
3453
Johannes Berg1e1430d2016-10-04 09:22:19 +02003454 if (skb && skb_has_frag_list(skb) &&
3455 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3456 if (skb_linearize(skb)) {
3457 ieee80211_free_txskb(&local->hw, skb);
3458 goto begin;
3459 }
3460 }
3461
Johannes Berg59862b02017-06-22 12:20:30 +02003462 switch (tx.sdata->vif.type) {
3463 case NL80211_IFTYPE_MONITOR:
3464 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3465 vif = &tx.sdata->vif;
3466 break;
3467 }
3468 tx.sdata = rcu_dereference(local->monitor_sdata);
3469 if (tx.sdata) {
3470 vif = &tx.sdata->vif;
3471 info->hw_queue =
3472 vif->hw_queue[skb_get_queue_mapping(skb)];
3473 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3474 ieee80211_free_txskb(&local->hw, skb);
3475 goto begin;
3476 } else {
3477 vif = NULL;
3478 }
3479 break;
3480 case NL80211_IFTYPE_AP_VLAN:
3481 tx.sdata = container_of(tx.sdata->bss,
3482 struct ieee80211_sub_if_data, u.ap);
3483 /* fall through */
3484 default:
3485 vif = &tx.sdata->vif;
3486 break;
3487 }
3488
3489 IEEE80211_SKB_CB(skb)->control.vif = vif;
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003490out:
3491 spin_unlock_bh(&fq->lock);
3492
Toke Høiland-Jørgensene0e2eff2016-09-22 19:04:19 +02003493 return skb;
3494}
3495EXPORT_SYMBOL(ieee80211_tx_dequeue);
3496
Johannes Berg4c9451e2014-11-09 18:50:10 +02003497void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3498 struct net_device *dev,
3499 u32 info_flags)
3500{
3501 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Berg97ffe752015-03-21 09:13:45 +01003502 struct sta_info *sta;
Johannes Berg80616c02015-04-14 14:50:41 +02003503 struct sk_buff *next;
Johannes Berg4c9451e2014-11-09 18:50:10 +02003504
3505 if (unlikely(skb->len < ETH_HLEN)) {
3506 kfree_skb(skb);
3507 return;
3508 }
3509
3510 rcu_read_lock();
3511
Johannes Berg2d981fd2015-04-10 14:10:10 +02003512 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3513 goto out_free;
Johannes Berg4c9451e2014-11-09 18:50:10 +02003514
Johannes Berg17c18bf2015-03-21 15:25:43 +01003515 if (!IS_ERR_OR_NULL(sta)) {
3516 struct ieee80211_fast_tx *fast_tx;
3517
3518 fast_tx = rcu_dereference(sta->fast_tx);
3519
3520 if (fast_tx &&
Toke Høiland-Jørgensenbb42f2d2016-09-22 19:04:20 +02003521 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
Johannes Berg17c18bf2015-03-21 15:25:43 +01003522 goto out;
3523 }
3524
Johannes Berg80616c02015-04-14 14:50:41 +02003525 if (skb_is_gso(skb)) {
3526 struct sk_buff *segs;
Johannes Berg680a0da2015-04-13 16:58:25 +02003527
Johannes Berg80616c02015-04-14 14:50:41 +02003528 segs = skb_gso_segment(skb, 0);
3529 if (IS_ERR(segs)) {
Johannes Berg2d981fd2015-04-10 14:10:10 +02003530 goto out_free;
Johannes Berg80616c02015-04-14 14:50:41 +02003531 } else if (segs) {
3532 consume_skb(skb);
3533 skb = segs;
3534 }
3535 } else {
3536 /* we cannot process non-linear frames on this path */
3537 if (skb_linearize(skb)) {
3538 kfree_skb(skb);
3539 goto out;
3540 }
3541
3542 /* the frame could be fragmented, software-encrypted, and other
3543 * things so we cannot really handle checksum offload with it -
3544 * fix it up in software before we handle anything else.
3545 */
3546 if (skb->ip_summed == CHECKSUM_PARTIAL) {
Johannes Bergf603f1f2015-05-05 15:25:33 +02003547 skb_set_transport_header(skb,
3548 skb_checksum_start_offset(skb));
Johannes Berg80616c02015-04-14 14:50:41 +02003549 if (skb_checksum_help(skb))
3550 goto out_free;
3551 }
Johannes Berg2d981fd2015-04-10 14:10:10 +02003552 }
3553
Johannes Berg80616c02015-04-14 14:50:41 +02003554 next = skb;
3555 while (next) {
3556 skb = next;
3557 next = skb->next;
Johannes Berg4c9451e2014-11-09 18:50:10 +02003558
Johannes Berg80616c02015-04-14 14:50:41 +02003559 skb->prev = NULL;
3560 skb->next = NULL;
Johannes Berg4c9451e2014-11-09 18:50:10 +02003561
Johannes Berg80616c02015-04-14 14:50:41 +02003562 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3563 if (IS_ERR(skb))
3564 goto out;
3565
Johannes Berg5a490512015-04-22 17:10:38 +02003566 ieee80211_tx_stats(dev, skb->len);
Johannes Berg80616c02015-04-14 14:50:41 +02003567
3568 ieee80211_xmit(sdata, sta, skb);
3569 }
Johannes Berg2d981fd2015-04-10 14:10:10 +02003570 goto out;
3571 out_free:
3572 kfree_skb(skb);
Johannes Berg4c9451e2014-11-09 18:50:10 +02003573 out:
3574 rcu_read_unlock();
3575}
3576
3577/**
3578 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3579 * @skb: packet to be sent
3580 * @dev: incoming interface
3581 *
3582 * On failure skb will be freed.
3583 */
Liad Kaufman24d342c2014-11-09 18:50:07 +02003584netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3585 struct net_device *dev)
3586{
3587 __ieee80211_subif_start_xmit(skb, dev, 0);
3588 return NETDEV_TX_OK;
3589}
Johannes Berge2ebc742007-07-27 15:43:22 +02003590
Johannes Berg7528ec52014-11-09 18:50:11 +02003591struct sk_buff *
3592ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3593 struct sk_buff *skb, u32 info_flags)
3594{
3595 struct ieee80211_hdr *hdr;
3596 struct ieee80211_tx_data tx = {
3597 .local = sdata->local,
3598 .sdata = sdata,
3599 };
Johannes Berg97ffe752015-03-21 09:13:45 +01003600 struct sta_info *sta;
Johannes Berg7528ec52014-11-09 18:50:11 +02003601
3602 rcu_read_lock();
3603
Johannes Berg97ffe752015-03-21 09:13:45 +01003604 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3605 kfree_skb(skb);
3606 skb = ERR_PTR(-EINVAL);
3607 goto out;
3608 }
3609
3610 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
Johannes Berg7528ec52014-11-09 18:50:11 +02003611 if (IS_ERR(skb))
3612 goto out;
3613
3614 hdr = (void *)skb->data;
3615 tx.sta = sta_info_get(sdata, hdr->addr1);
3616 tx.skb = skb;
3617
3618 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3619 rcu_read_unlock();
3620 kfree_skb(skb);
3621 return ERR_PTR(-EINVAL);
3622 }
3623
3624out:
3625 rcu_read_unlock();
3626 return skb;
3627}
3628
Johannes Berge2530082008-05-17 00:57:14 +02003629/*
3630 * ieee80211_clear_tx_pending may not be called in a context where
3631 * it is possible that it packets could come in again.
3632 */
Johannes Berge2ebc742007-07-27 15:43:22 +02003633void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3634{
Felix Fietkau1f98ab72012-11-10 03:44:14 +01003635 struct sk_buff *skb;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01003636 int i;
Johannes Berge2ebc742007-07-27 15:43:22 +02003637
Felix Fietkau1f98ab72012-11-10 03:44:14 +01003638 for (i = 0; i < local->hw.queues; i++) {
3639 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3640 ieee80211_free_txskb(&local->hw, skb);
3641 }
Johannes Berge2ebc742007-07-27 15:43:22 +02003642}
3643
Johannes Berg7bb45682011-02-24 14:42:06 +01003644/*
3645 * Returns false if the frame couldn't be transmitted but was queued instead,
3646 * which in this case means re-queued -- take as an indication to stop sending
3647 * more pending frames.
3648 */
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003649static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3650 struct sk_buff *skb)
3651{
3652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3653 struct ieee80211_sub_if_data *sdata;
3654 struct sta_info *sta;
3655 struct ieee80211_hdr *hdr;
Johannes Berg7bb45682011-02-24 14:42:06 +01003656 bool result;
Johannes Berg55de9082012-07-26 17:24:39 +02003657 struct ieee80211_chanctx_conf *chanctx_conf;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003658
Johannes Berg5061b0c2009-07-14 00:33:34 +02003659 sdata = vif_to_sdata(info->control.vif);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003660
3661 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
Johannes Berg55de9082012-07-26 17:24:39 +02003662 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3663 if (unlikely(!chanctx_conf)) {
3664 dev_kfree_skb(skb);
3665 return true;
3666 }
Johannes Berg73c4e192014-11-09 18:50:09 +02003667 info->band = chanctx_conf->def.chan->band;
Johannes Berg7c107702015-03-20 14:18:27 +01003668 result = ieee80211_tx(sdata, NULL, skb, true);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003669 } else {
Johannes Berg252b86c2011-11-16 15:28:55 +01003670 struct sk_buff_head skbs;
3671
3672 __skb_queue_head_init(&skbs);
3673 __skb_queue_tail(&skbs, skb);
3674
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003675 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergabe60632009-11-25 17:46:18 +01003676 sta = sta_info_get(sdata, hdr->addr1);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003677
Johannes Berg74e4dbf2011-11-16 15:28:57 +01003678 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003679 }
3680
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003681 return result;
3682}
3683
Johannes Berge2530082008-05-17 00:57:14 +02003684/*
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003685 * Transmit all pending packets. Called from tasklet.
Johannes Berge2530082008-05-17 00:57:14 +02003686 */
Johannes Berge2ebc742007-07-27 15:43:22 +02003687void ieee80211_tx_pending(unsigned long data)
3688{
3689 struct ieee80211_local *local = (struct ieee80211_local *)data;
Johannes Berg2a577d92009-03-23 17:28:37 +01003690 unsigned long flags;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01003691 int i;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003692 bool txok;
Johannes Berge2ebc742007-07-27 15:43:22 +02003693
Johannes Bergf0e72852009-03-23 17:28:36 +01003694 rcu_read_lock();
Johannes Berg2a577d92009-03-23 17:28:37 +01003695
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003696 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
Johannes Berg176be722009-03-12 23:49:28 +01003697 for (i = 0; i < local->hw.queues; i++) {
Johannes Berg2a577d92009-03-23 17:28:37 +01003698 /*
3699 * If queue is stopped by something other than due to pending
3700 * frames, or we have no pending frames, proceed to next queue.
3701 */
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003702 if (local->queue_stop_reasons[i] ||
Johannes Berg2a577d92009-03-23 17:28:37 +01003703 skb_queue_empty(&local->pending[i]))
Johannes Berge2ebc742007-07-27 15:43:22 +02003704 continue;
Johannes Berge2530082008-05-17 00:57:14 +02003705
Johannes Berg2a577d92009-03-23 17:28:37 +01003706 while (!skb_queue_empty(&local->pending[i])) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003707 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
Johannes Berg5061b0c2009-07-14 00:33:34 +02003708 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg5061b0c2009-07-14 00:33:34 +02003709
Johannes Berga7bc3762009-07-27 10:33:31 +02003710 if (WARN_ON(!info->control.vif)) {
Felix Fietkauc3e77242012-10-08 14:39:33 +02003711 ieee80211_free_txskb(&local->hw, skb);
Johannes Berga7bc3762009-07-27 10:33:31 +02003712 continue;
3713 }
3714
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003715 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3716 flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01003717
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003718 txok = ieee80211_tx_pending_skb(local, skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003719 spin_lock_irqsave(&local->queue_stop_reason_lock,
3720 flags);
3721 if (!txok)
Johannes Berg2a577d92009-03-23 17:28:37 +01003722 break;
Johannes Berge2ebc742007-07-27 15:43:22 +02003723 }
Johannes Berg7236fe22010-03-22 13:42:43 -07003724
3725 if (skb_queue_empty(&local->pending[i]))
Johannes Berg3a25a8c2012-04-03 16:28:50 +02003726 ieee80211_propagate_queue_wake(local, i);
Johannes Berge2ebc742007-07-27 15:43:22 +02003727 }
Johannes Berg3b8d81e02009-06-17 17:43:56 +02003728 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01003729
Johannes Bergf0e72852009-03-23 17:28:36 +01003730 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02003731}
3732
3733/* functions for drivers to get certain frames */
3734
Marco Porscheac70c12013-01-07 16:04:50 +01003735static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03003736 struct ps_data *ps, struct sk_buff *skb,
3737 bool is_template)
Johannes Berge2ebc742007-07-27 15:43:22 +02003738{
3739 u8 *pos, *tim;
3740 int aid0 = 0;
3741 int i, have_bits = 0, n1, n2;
3742
3743 /* Generate bitmap for TIM only if there are any STAs in power save
3744 * mode. */
Marco Porschd012a602012-10-10 12:39:50 -07003745 if (atomic_read(&ps->num_sta_ps) > 0)
Johannes Berge2ebc742007-07-27 15:43:22 +02003746 /* in the hope that this is faster than
3747 * checking byte-for-byte */
Weilong Chenf359d3f2013-12-18 15:44:16 +08003748 have_bits = !bitmap_empty((unsigned long *)ps->tim,
Johannes Berge2ebc742007-07-27 15:43:22 +02003749 IEEE80211_MAX_AID+1);
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03003750 if (!is_template) {
3751 if (ps->dtim_count == 0)
3752 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3753 else
3754 ps->dtim_count--;
3755 }
Johannes Berge2ebc742007-07-27 15:43:22 +02003756
3757 tim = pos = (u8 *) skb_put(skb, 6);
3758 *pos++ = WLAN_EID_TIM;
3759 *pos++ = 4;
Marco Porschd012a602012-10-10 12:39:50 -07003760 *pos++ = ps->dtim_count;
Johannes Berg88600202012-02-13 15:17:18 +01003761 *pos++ = sdata->vif.bss_conf.dtim_period;
Johannes Berge2ebc742007-07-27 15:43:22 +02003762
Marco Porschd012a602012-10-10 12:39:50 -07003763 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
Johannes Berge2ebc742007-07-27 15:43:22 +02003764 aid0 = 1;
3765
Marco Porschd012a602012-10-10 12:39:50 -07003766 ps->dtim_bc_mc = aid0 == 1;
Christian Lamparter512119b2011-01-31 20:48:44 +02003767
Johannes Berge2ebc742007-07-27 15:43:22 +02003768 if (have_bits) {
3769 /* Find largest even number N1 so that bits numbered 1 through
3770 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3771 * (N2 + 1) x 8 through 2007 are 0. */
3772 n1 = 0;
3773 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
Marco Porschd012a602012-10-10 12:39:50 -07003774 if (ps->tim[i]) {
Johannes Berge2ebc742007-07-27 15:43:22 +02003775 n1 = i & 0xfe;
3776 break;
3777 }
3778 }
3779 n2 = n1;
3780 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
Marco Porschd012a602012-10-10 12:39:50 -07003781 if (ps->tim[i]) {
Johannes Berge2ebc742007-07-27 15:43:22 +02003782 n2 = i;
3783 break;
3784 }
3785 }
3786
3787 /* Bitmap control */
3788 *pos++ = n1 | aid0;
3789 /* Part Virt Bitmap */
Eliad Peller5220da32011-11-24 16:50:00 +02003790 skb_put(skb, n2 - n1);
Marco Porschd012a602012-10-10 12:39:50 -07003791 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
Johannes Berge2ebc742007-07-27 15:43:22 +02003792
3793 tim[1] = n2 - n1 + 4;
Johannes Berge2ebc742007-07-27 15:43:22 +02003794 } else {
3795 *pos++ = aid0; /* Bitmap control */
3796 *pos++ = 0; /* Part Virt Bitmap */
3797 }
Johannes Berge2ebc742007-07-27 15:43:22 +02003798}
3799
Marco Porscheac70c12013-01-07 16:04:50 +01003800static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03003801 struct ps_data *ps, struct sk_buff *skb,
3802 bool is_template)
Marco Porscheac70c12013-01-07 16:04:50 +01003803{
3804 struct ieee80211_local *local = sdata->local;
3805
3806 /*
3807 * Not very nice, but we want to allow the driver to call
3808 * ieee80211_beacon_get() as a response to the set_tim()
3809 * callback. That, however, is already invoked under the
3810 * sta_lock to guarantee consistent and race-free update
3811 * of the tim bitmap in mac80211 and the driver.
3812 */
3813 if (local->tim_in_locked_section) {
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03003814 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
Marco Porscheac70c12013-01-07 16:04:50 +01003815 } else {
Johannes Berg1b917312013-02-22 12:55:01 +01003816 spin_lock_bh(&local->tim_lock);
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03003817 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
Johannes Berg1b917312013-02-22 12:55:01 +01003818 spin_unlock_bh(&local->tim_lock);
Marco Porscheac70c12013-01-07 16:04:50 +01003819 }
3820
3821 return 0;
3822}
3823
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003824static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3825 struct beacon_data *beacon)
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003826{
3827 struct probe_resp *resp;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02003828 u8 *beacon_data;
3829 size_t beacon_data_len;
Andrei Otcheretianski0d06d9b2014-05-09 14:11:47 +03003830 int i;
Michal Kazioraf296bd2014-06-05 14:21:36 +02003831 u8 count = beacon->csa_current_counter;
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003832
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02003833 switch (sdata->vif.type) {
3834 case NL80211_IFTYPE_AP:
3835 beacon_data = beacon->tail;
3836 beacon_data_len = beacon->tail_len;
3837 break;
3838 case NL80211_IFTYPE_ADHOC:
3839 beacon_data = beacon->head;
3840 beacon_data_len = beacon->head_len;
3841 break;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07003842 case NL80211_IFTYPE_MESH_POINT:
3843 beacon_data = beacon->head;
3844 beacon_data_len = beacon->head_len;
3845 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02003846 default:
3847 return;
3848 }
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003849
Michal Kazioraf296bd2014-06-05 14:21:36 +02003850 rcu_read_lock();
Andrei Otcheretianski0d06d9b2014-05-09 14:11:47 +03003851 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
Michal Kazioraf296bd2014-06-05 14:21:36 +02003852 resp = rcu_dereference(sdata->u.ap.probe_resp);
Andrei Otcheretianski0d06d9b2014-05-09 14:11:47 +03003853
Michal Kazioraf296bd2014-06-05 14:21:36 +02003854 if (beacon->csa_counter_offsets[i]) {
3855 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3856 beacon_data_len)) {
Andrei Otcheretianski0d06d9b2014-05-09 14:11:47 +03003857 rcu_read_unlock();
3858 return;
3859 }
Michal Kazioraf296bd2014-06-05 14:21:36 +02003860
3861 beacon_data[beacon->csa_counter_offsets[i]] = count;
Andrei Otcheretianski0d06d9b2014-05-09 14:11:47 +03003862 }
Michal Kazioraf296bd2014-06-05 14:21:36 +02003863
3864 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3865 resp->data[resp->csa_counter_offsets[i]] = count;
Andrei Otcheretianski0d06d9b2014-05-09 14:11:47 +03003866 }
Michal Kazioraf296bd2014-06-05 14:21:36 +02003867 rcu_read_unlock();
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003868}
3869
Wojciech Dubowike996ec22015-06-10 13:06:53 +02003870static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3871{
3872 beacon->csa_current_counter--;
3873
3874 /* the counter should never reach 0 */
3875 WARN_ON_ONCE(!beacon->csa_current_counter);
3876
3877 return beacon->csa_current_counter;
3878}
3879
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003880u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3881{
3882 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
Michal Kazioraf296bd2014-06-05 14:21:36 +02003883 struct beacon_data *beacon = NULL;
3884 u8 count = 0;
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003885
Michal Kazioraf296bd2014-06-05 14:21:36 +02003886 rcu_read_lock();
3887
3888 if (sdata->vif.type == NL80211_IFTYPE_AP)
3889 beacon = rcu_dereference(sdata->u.ap.beacon);
3890 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3891 beacon = rcu_dereference(sdata->u.ibss.presp);
3892 else if (ieee80211_vif_is_mesh(&sdata->vif))
3893 beacon = rcu_dereference(sdata->u.mesh.beacon);
3894
3895 if (!beacon)
3896 goto unlock;
3897
Wojciech Dubowike996ec22015-06-10 13:06:53 +02003898 count = __ieee80211_csa_update_counter(beacon);
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003899
Michal Kazioraf296bd2014-06-05 14:21:36 +02003900unlock:
3901 rcu_read_unlock();
3902 return count;
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003903}
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003904EXPORT_SYMBOL(ieee80211_csa_update_counter);
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003905
3906bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3907{
3908 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3909 struct beacon_data *beacon = NULL;
3910 u8 *beacon_data;
3911 size_t beacon_data_len;
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003912 int ret = false;
3913
3914 if (!ieee80211_sdata_running(sdata))
3915 return false;
3916
3917 rcu_read_lock();
3918 if (vif->type == NL80211_IFTYPE_AP) {
3919 struct ieee80211_if_ap *ap = &sdata->u.ap;
3920
3921 beacon = rcu_dereference(ap->beacon);
3922 if (WARN_ON(!beacon || !beacon->tail))
3923 goto out;
3924 beacon_data = beacon->tail;
3925 beacon_data_len = beacon->tail_len;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02003926 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3927 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3928
3929 beacon = rcu_dereference(ifibss->presp);
3930 if (!beacon)
3931 goto out;
3932
3933 beacon_data = beacon->head;
3934 beacon_data_len = beacon->head_len;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07003935 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3936 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3937
3938 beacon = rcu_dereference(ifmsh->beacon);
3939 if (!beacon)
3940 goto out;
3941
3942 beacon_data = beacon->head;
3943 beacon_data_len = beacon->head_len;
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003944 } else {
3945 WARN_ON(1);
3946 goto out;
3947 }
3948
Michal Kazior10d78f22014-06-05 14:21:37 +02003949 if (!beacon->csa_counter_offsets[0])
3950 goto out;
3951
Michal Kazioraf296bd2014-06-05 14:21:36 +02003952 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003953 goto out;
3954
Michal Kazioraf296bd2014-06-05 14:21:36 +02003955 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
Simon Wunderlich73da7d52013-07-11 16:09:06 +02003956 ret = true;
3957 out:
3958 rcu_read_unlock();
3959
3960 return ret;
3961}
3962EXPORT_SYMBOL(ieee80211_csa_is_complete);
3963
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03003964static struct sk_buff *
3965__ieee80211_beacon_get(struct ieee80211_hw *hw,
3966 struct ieee80211_vif *vif,
3967 struct ieee80211_mutable_offsets *offs,
3968 bool is_template)
Johannes Berge2ebc742007-07-27 15:43:22 +02003969{
3970 struct ieee80211_local *local = hw_to_local(hw);
Michal Kazioraf296bd2014-06-05 14:21:36 +02003971 struct beacon_data *beacon = NULL;
Johannes Berg9d139c82008-07-09 14:40:37 +02003972 struct sk_buff *skb = NULL;
Johannes Berge039fa42008-05-15 12:55:29 +02003973 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02003974 struct ieee80211_sub_if_data *sdata = NULL;
Johannes Berg57fbcce2016-04-12 15:56:15 +02003975 enum nl80211_band band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02003976 struct ieee80211_tx_rate_control txrc;
Johannes Berg55de9082012-07-26 17:24:39 +02003977 struct ieee80211_chanctx_conf *chanctx_conf;
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003978 int csa_off_base = 0;
Johannes Berg8318d782008-01-24 19:38:38 +01003979
Johannes Berg5dfdaf52007-12-19 02:03:33 +01003980 rcu_read_lock();
Johannes Berge2ebc742007-07-27 15:43:22 +02003981
Johannes Berg32bfd352007-12-19 01:31:26 +01003982 sdata = vif_to_sdata(vif);
Johannes Berg55de9082012-07-26 17:24:39 +02003983 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berge2ebc742007-07-27 15:43:22 +02003984
Johannes Berg55de9082012-07-26 17:24:39 +02003985 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
Felix Fietkaueb3e5542011-01-24 19:28:49 +01003986 goto out;
3987
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03003988 if (offs)
3989 memset(offs, 0, sizeof(*offs));
Johannes Bergeddcbb92009-10-29 08:30:35 +01003990
Johannes Berg05c914f2008-09-11 00:01:58 +02003991 if (sdata->vif.type == NL80211_IFTYPE_AP) {
Marco Porschd012a602012-10-10 12:39:50 -07003992 struct ieee80211_if_ap *ap = &sdata->u.ap;
Marco Porschd012a602012-10-10 12:39:50 -07003993
Michal Kazioraf296bd2014-06-05 14:21:36 +02003994 beacon = rcu_dereference(ap->beacon);
Dan Carpenter3ad97fb2011-02-07 22:03:35 +03003995 if (beacon) {
Michal Kazior10d78f22014-06-05 14:21:37 +02003996 if (beacon->csa_counter_offsets[0]) {
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003997 if (!is_template)
Wojciech Dubowike996ec22015-06-10 13:06:53 +02003998 __ieee80211_csa_update_counter(beacon);
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03003999
4000 ieee80211_set_csa(sdata, beacon);
4001 }
Simon Wunderlich73da7d52013-07-11 16:09:06 +02004002
Johannes Berg902acc72008-02-23 15:17:19 +01004003 /*
4004 * headroom, head length,
4005 * tail length and maximum TIM length
4006 */
4007 skb = dev_alloc_skb(local->tx_headroom +
4008 beacon->head_len +
Felix Fietkau70dabeb2013-12-14 13:54:53 +01004009 beacon->tail_len + 256 +
4010 local->hw.extra_beacon_tailroom);
Johannes Berg902acc72008-02-23 15:17:19 +01004011 if (!skb)
4012 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01004013
Johannes Berg902acc72008-02-23 15:17:19 +01004014 skb_reserve(skb, local->tx_headroom);
4015 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4016 beacon->head_len);
4017
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004018 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4019 is_template);
Johannes Berg902acc72008-02-23 15:17:19 +01004020
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004021 if (offs) {
4022 offs->tim_offset = beacon->head_len;
4023 offs->tim_length = skb->len - beacon->head_len;
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004024
4025 /* for AP the csa offsets are from tail */
4026 csa_off_base = skb->len;
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004027 }
Johannes Bergeddcbb92009-10-29 08:30:35 +01004028
Johannes Berg902acc72008-02-23 15:17:19 +01004029 if (beacon->tail)
4030 memcpy(skb_put(skb, beacon->tail_len),
4031 beacon->tail, beacon->tail_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02004032 } else
4033 goto out;
Johannes Berg05c914f2008-09-11 00:01:58 +02004034 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Johannes Berg46900292009-02-15 12:44:28 +01004035 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg9d139c82008-07-09 14:40:37 +02004036 struct ieee80211_hdr *hdr;
Johannes Berg902acc72008-02-23 15:17:19 +01004037
Michal Kazioraf296bd2014-06-05 14:21:36 +02004038 beacon = rcu_dereference(ifibss->presp);
4039 if (!beacon)
Johannes Berg9d139c82008-07-09 14:40:37 +02004040 goto out;
4041
Michal Kazior10d78f22014-06-05 14:21:37 +02004042 if (beacon->csa_counter_offsets[0]) {
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004043 if (!is_template)
Wojciech Dubowike996ec22015-06-10 13:06:53 +02004044 __ieee80211_csa_update_counter(beacon);
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02004045
Michal Kazioraf296bd2014-06-05 14:21:36 +02004046 ieee80211_set_csa(sdata, beacon);
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004047 }
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02004048
Michal Kazioraf296bd2014-06-05 14:21:36 +02004049 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
Felix Fietkau70dabeb2013-12-14 13:54:53 +01004050 local->hw.extra_beacon_tailroom);
Johannes Berg9d139c82008-07-09 14:40:37 +02004051 if (!skb)
4052 goto out;
Johannes Bergc3ffeab2013-03-07 20:54:29 +01004053 skb_reserve(skb, local->tx_headroom);
Michal Kazioraf296bd2014-06-05 14:21:36 +02004054 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4055 beacon->head_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02004056
4057 hdr = (struct ieee80211_hdr *) skb->data;
Harvey Harrisone7827a72008-07-15 18:44:13 -07004058 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4059 IEEE80211_STYPE_BEACON);
Johannes Berg902acc72008-02-23 15:17:19 +01004060 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
Javier Cardonadbf498f2012-03-31 11:31:32 -07004061 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +02004062
Michal Kazioraf296bd2014-06-05 14:21:36 +02004063 beacon = rcu_dereference(ifmsh->beacon);
4064 if (!beacon)
Johannes Bergac1bd842011-01-18 13:45:32 +01004065 goto out;
Johannes Bergac1bd842011-01-18 13:45:32 +01004066
Michal Kazior10d78f22014-06-05 14:21:37 +02004067 if (beacon->csa_counter_offsets[0]) {
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004068 if (!is_template)
4069 /* TODO: For mesh csa_counter is in TU, so
4070 * decrementing it by one isn't correct, but
4071 * for now we leave it consistent with overall
4072 * mac80211's behavior.
4073 */
Wojciech Dubowike996ec22015-06-10 13:06:53 +02004074 __ieee80211_csa_update_counter(beacon);
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004075
Michal Kazioraf296bd2014-06-05 14:21:36 +02004076 ieee80211_set_csa(sdata, beacon);
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004077 }
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07004078
Javier Cardonadbf498f2012-03-31 11:31:32 -07004079 if (ifmsh->sync_ops)
Michal Kazioraf296bd2014-06-05 14:21:36 +02004080 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
Javier Cardonadbf498f2012-03-31 11:31:32 -07004081
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -07004082 skb = dev_alloc_skb(local->tx_headroom +
Michal Kazioraf296bd2014-06-05 14:21:36 +02004083 beacon->head_len +
Marco Porsch3f52b7e2013-01-30 18:14:08 +01004084 256 + /* TIM IE */
Michal Kazioraf296bd2014-06-05 14:21:36 +02004085 beacon->tail_len +
Felix Fietkau70dabeb2013-12-14 13:54:53 +01004086 local->hw.extra_beacon_tailroom);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01004087 if (!skb)
4088 goto out;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08004089 skb_reserve(skb, local->tx_headroom);
Michal Kazioraf296bd2014-06-05 14:21:36 +02004090 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4091 beacon->head_len);
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004092 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4093
4094 if (offs) {
Michal Kazioraf296bd2014-06-05 14:21:36 +02004095 offs->tim_offset = beacon->head_len;
4096 offs->tim_length = skb->len - beacon->head_len;
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004097 }
4098
Michal Kazioraf296bd2014-06-05 14:21:36 +02004099 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4100 beacon->tail_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02004101 } else {
4102 WARN_ON(1);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01004103 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02004104 }
4105
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004106 /* CSA offsets */
Michal Kazioraf296bd2014-06-05 14:21:36 +02004107 if (offs && beacon) {
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004108 int i;
4109
4110 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
Michal Kazioraf296bd2014-06-05 14:21:36 +02004111 u16 csa_off = beacon->csa_counter_offsets[i];
Andrei Otcheretianski1af586c2014-05-09 14:11:50 +03004112
4113 if (!csa_off)
4114 continue;
4115
4116 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4117 }
4118 }
4119
Johannes Berg4bf88532012-11-09 11:39:59 +01004120 band = chanctx_conf->def.chan->band;
Johannes Berg55de9082012-07-26 17:24:39 +02004121
Johannes Berge039fa42008-05-15 12:55:29 +02004122 info = IEEE80211_SKB_CB(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02004123
Johannes Berg3b8d81e02009-06-17 17:43:56 +02004124 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Jouni Malinene00cfce2009-12-29 12:59:19 +02004125 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Johannes Berge039fa42008-05-15 12:55:29 +02004126 info->band = band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02004127
4128 memset(&txrc, 0, sizeof(txrc));
4129 txrc.hw = hw;
Johannes Berge31583c2012-07-26 14:07:46 +02004130 txrc.sband = local->hw.wiphy->bands[band];
Jouni Malinene00cfce2009-12-29 12:59:19 +02004131 txrc.bss_conf = &sdata->vif.bss_conf;
4132 txrc.skb = skb;
4133 txrc.reported_rate.idx = -1;
Jouni Malinen37eb0b12010-01-06 13:09:08 +02004134 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
Johannes Berge31583c2012-07-26 14:07:46 +02004135 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
Jouni Malinen37eb0b12010-01-06 13:09:08 +02004136 txrc.max_rate_idx = -1;
4137 else
4138 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Felix Fietkau8f0729b2010-11-11 15:07:23 +01004139 txrc.bss = true;
Jouni Malinene00cfce2009-12-29 12:59:19 +02004140 rate_control_get_rate(sdata, NULL, &txrc);
Johannes Berge039fa42008-05-15 12:55:29 +02004141
4142 info->control.vif = vif;
Johannes Bergf591fa52008-07-10 11:21:26 +02004143
John W. Linvillea472e712010-05-06 14:45:17 -04004144 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4145 IEEE80211_TX_CTL_ASSIGN_SEQ |
4146 IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge6a98542008-10-21 12:40:02 +02004147 out:
Johannes Berg5dfdaf52007-12-19 02:03:33 +01004148 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02004149 return skb;
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004150
4151}
4152
4153struct sk_buff *
4154ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4155 struct ieee80211_vif *vif,
4156 struct ieee80211_mutable_offsets *offs)
4157{
4158 return __ieee80211_beacon_get(hw, vif, offs, true);
4159}
4160EXPORT_SYMBOL(ieee80211_beacon_get_template);
4161
4162struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4163 struct ieee80211_vif *vif,
4164 u16 *tim_offset, u16 *tim_length)
4165{
4166 struct ieee80211_mutable_offsets offs = {};
4167 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
Helmut Schaa35afa582015-09-09 09:46:32 +02004168 struct sk_buff *copy;
4169 struct ieee80211_supported_band *sband;
4170 int shift;
4171
4172 if (!bcn)
4173 return bcn;
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004174
4175 if (tim_offset)
4176 *tim_offset = offs.tim_offset;
4177
4178 if (tim_length)
4179 *tim_length = offs.tim_length;
4180
Helmut Schaa35afa582015-09-09 09:46:32 +02004181 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4182 !hw_to_local(hw)->monitors)
4183 return bcn;
4184
4185 /* send a copy to monitor interfaces */
4186 copy = skb_copy(bcn, GFP_ATOMIC);
4187 if (!copy)
4188 return bcn;
4189
4190 shift = ieee80211_vif_get_shift(vif);
Mohammed Shafi Shajakhan92db8072017-04-27 12:45:38 +05304191 sband = ieee80211_get_sband(vif_to_sdata(vif));
4192 if (!sband)
4193 return bcn;
4194
Helmut Schaa35afa582015-09-09 09:46:32 +02004195 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4196
Andrei Otcheretianski6ec8c332014-05-09 14:11:49 +03004197 return bcn;
Johannes Berge2ebc742007-07-27 15:43:22 +02004198}
Johannes Bergeddcbb92009-10-29 08:30:35 +01004199EXPORT_SYMBOL(ieee80211_beacon_get_tim);
Johannes Berge2ebc742007-07-27 15:43:22 +02004200
Arik Nemtsov02945822011-11-10 11:28:57 +02004201struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4202 struct ieee80211_vif *vif)
4203{
4204 struct ieee80211_if_ap *ap = NULL;
Eyal Shapiraaa7a0082012-08-06 14:26:16 +03004205 struct sk_buff *skb = NULL;
4206 struct probe_resp *presp = NULL;
Arik Nemtsov02945822011-11-10 11:28:57 +02004207 struct ieee80211_hdr *hdr;
4208 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4209
4210 if (sdata->vif.type != NL80211_IFTYPE_AP)
4211 return NULL;
4212
4213 rcu_read_lock();
4214
4215 ap = &sdata->u.ap;
4216 presp = rcu_dereference(ap->probe_resp);
4217 if (!presp)
4218 goto out;
4219
Eyal Shapiraaa7a0082012-08-06 14:26:16 +03004220 skb = dev_alloc_skb(presp->len);
Arik Nemtsov02945822011-11-10 11:28:57 +02004221 if (!skb)
4222 goto out;
4223
Eyal Shapiraaa7a0082012-08-06 14:26:16 +03004224 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4225
Arik Nemtsov02945822011-11-10 11:28:57 +02004226 hdr = (struct ieee80211_hdr *) skb->data;
4227 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4228
4229out:
4230 rcu_read_unlock();
4231 return skb;
4232}
4233EXPORT_SYMBOL(ieee80211_proberesp_get);
4234
Kalle Valo7044cc52010-01-05 20:16:19 +02004235struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4236 struct ieee80211_vif *vif)
4237{
4238 struct ieee80211_sub_if_data *sdata;
4239 struct ieee80211_if_managed *ifmgd;
4240 struct ieee80211_pspoll *pspoll;
4241 struct ieee80211_local *local;
4242 struct sk_buff *skb;
4243
4244 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4245 return NULL;
4246
4247 sdata = vif_to_sdata(vif);
4248 ifmgd = &sdata->u.mgd;
4249 local = sdata->local;
4250
4251 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
Joe Perchesd15b8452011-08-29 14:17:31 -07004252 if (!skb)
Kalle Valo7044cc52010-01-05 20:16:19 +02004253 return NULL;
Joe Perchesd15b8452011-08-29 14:17:31 -07004254
Kalle Valo7044cc52010-01-05 20:16:19 +02004255 skb_reserve(skb, local->hw.extra_tx_headroom);
4256
4257 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4258 memset(pspoll, 0, sizeof(*pspoll));
4259 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4260 IEEE80211_STYPE_PSPOLL);
4261 pspoll->aid = cpu_to_le16(ifmgd->aid);
4262
4263 /* aid in PS-Poll has its two MSBs each set to 1 */
4264 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4265
4266 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4267 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4268
4269 return skb;
4270}
4271EXPORT_SYMBOL(ieee80211_pspoll_get);
4272
4273struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4274 struct ieee80211_vif *vif)
4275{
4276 struct ieee80211_hdr_3addr *nullfunc;
4277 struct ieee80211_sub_if_data *sdata;
4278 struct ieee80211_if_managed *ifmgd;
4279 struct ieee80211_local *local;
4280 struct sk_buff *skb;
4281
4282 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4283 return NULL;
4284
4285 sdata = vif_to_sdata(vif);
4286 ifmgd = &sdata->u.mgd;
4287 local = sdata->local;
4288
4289 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
Joe Perchesd15b8452011-08-29 14:17:31 -07004290 if (!skb)
Kalle Valo7044cc52010-01-05 20:16:19 +02004291 return NULL;
Joe Perchesd15b8452011-08-29 14:17:31 -07004292
Kalle Valo7044cc52010-01-05 20:16:19 +02004293 skb_reserve(skb, local->hw.extra_tx_headroom);
4294
4295 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4296 sizeof(*nullfunc));
4297 memset(nullfunc, 0, sizeof(*nullfunc));
4298 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4299 IEEE80211_STYPE_NULLFUNC |
4300 IEEE80211_FCTL_TODS);
4301 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4302 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4303 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4304
4305 return skb;
4306}
4307EXPORT_SYMBOL(ieee80211_nullfunc_get);
4308
Kalle Valo05e54ea2010-01-05 20:16:38 +02004309struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
Johannes Berga344d672014-06-12 22:24:31 +02004310 const u8 *src_addr,
Kalle Valo05e54ea2010-01-05 20:16:38 +02004311 const u8 *ssid, size_t ssid_len,
Johannes Bergb9a9ada2012-11-29 13:00:10 +01004312 size_t tailroom)
Kalle Valo05e54ea2010-01-05 20:16:38 +02004313{
Johannes Berga344d672014-06-12 22:24:31 +02004314 struct ieee80211_local *local = hw_to_local(hw);
Kalle Valo05e54ea2010-01-05 20:16:38 +02004315 struct ieee80211_hdr_3addr *hdr;
4316 struct sk_buff *skb;
4317 size_t ie_ssid_len;
4318 u8 *pos;
4319
Kalle Valo05e54ea2010-01-05 20:16:38 +02004320 ie_ssid_len = 2 + ssid_len;
4321
4322 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
Johannes Bergb9a9ada2012-11-29 13:00:10 +01004323 ie_ssid_len + tailroom);
Joe Perchesd15b8452011-08-29 14:17:31 -07004324 if (!skb)
Kalle Valo05e54ea2010-01-05 20:16:38 +02004325 return NULL;
Kalle Valo05e54ea2010-01-05 20:16:38 +02004326
4327 skb_reserve(skb, local->hw.extra_tx_headroom);
4328
4329 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4330 memset(hdr, 0, sizeof(*hdr));
4331 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4332 IEEE80211_STYPE_PROBE_REQ);
Johannes Berge83e6542012-07-13 16:23:07 +02004333 eth_broadcast_addr(hdr->addr1);
Johannes Berga344d672014-06-12 22:24:31 +02004334 memcpy(hdr->addr2, src_addr, ETH_ALEN);
Johannes Berge83e6542012-07-13 16:23:07 +02004335 eth_broadcast_addr(hdr->addr3);
Kalle Valo05e54ea2010-01-05 20:16:38 +02004336
4337 pos = skb_put(skb, ie_ssid_len);
4338 *pos++ = WLAN_EID_SSID;
4339 *pos++ = ssid_len;
Stanislaw Gruszka88c868c2012-03-29 16:30:41 +02004340 if (ssid_len)
Kalle Valo05e54ea2010-01-05 20:16:38 +02004341 memcpy(pos, ssid, ssid_len);
4342 pos += ssid_len;
4343
Kalle Valo05e54ea2010-01-05 20:16:38 +02004344 return skb;
4345}
4346EXPORT_SYMBOL(ieee80211_probereq_get);
4347
Johannes Berg32bfd352007-12-19 01:31:26 +01004348void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02004349 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02004350 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02004351 struct ieee80211_rts *rts)
4352{
4353 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02004354
Harvey Harrison065e96052008-06-22 16:45:27 -07004355 rts->frame_control =
4356 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01004357 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4358 frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02004359 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4360 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4361}
4362EXPORT_SYMBOL(ieee80211_rts_get);
4363
Johannes Berg32bfd352007-12-19 01:31:26 +01004364void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02004365 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02004366 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02004367 struct ieee80211_cts *cts)
4368{
4369 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02004370
Harvey Harrison065e96052008-06-22 16:45:27 -07004371 cts->frame_control =
4372 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01004373 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4374 frame_len, frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02004375 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4376}
4377EXPORT_SYMBOL(ieee80211_ctstoself_get);
4378
4379struct sk_buff *
Johannes Berg32bfd352007-12-19 01:31:26 +01004380ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
Johannes Berge039fa42008-05-15 12:55:29 +02004381 struct ieee80211_vif *vif)
Johannes Berge2ebc742007-07-27 15:43:22 +02004382{
4383 struct ieee80211_local *local = hw_to_local(hw);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03004384 struct sk_buff *skb = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01004385 struct ieee80211_tx_data tx;
Johannes Berge2ebc742007-07-27 15:43:22 +02004386 struct ieee80211_sub_if_data *sdata;
Marco Porschd012a602012-10-10 12:39:50 -07004387 struct ps_data *ps;
Johannes Berge039fa42008-05-15 12:55:29 +02004388 struct ieee80211_tx_info *info;
Johannes Berg55de9082012-07-26 17:24:39 +02004389 struct ieee80211_chanctx_conf *chanctx_conf;
Johannes Berge2ebc742007-07-27 15:43:22 +02004390
Johannes Berg32bfd352007-12-19 01:31:26 +01004391 sdata = vif_to_sdata(vif);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01004392
Johannes Berg5dfdaf52007-12-19 02:03:33 +01004393 rcu_read_lock();
Johannes Berg55de9082012-07-26 17:24:39 +02004394 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01004395
Marco Porschd012a602012-10-10 12:39:50 -07004396 if (!chanctx_conf)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03004397 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01004398
Marco Porschd012a602012-10-10 12:39:50 -07004399 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4400 struct beacon_data *beacon =
4401 rcu_dereference(sdata->u.ap.beacon);
4402
4403 if (!beacon || !beacon->head)
4404 goto out;
4405
4406 ps = &sdata->u.ap.ps;
Marco Porsch3f52b7e2013-01-30 18:14:08 +01004407 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4408 ps = &sdata->u.mesh.ps;
Marco Porschd012a602012-10-10 12:39:50 -07004409 } else {
4410 goto out;
4411 }
4412
4413 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03004414 goto out; /* send buffered bc/mc only after DTIM beacon */
Johannes Berge039fa42008-05-15 12:55:29 +02004415
Johannes Berge2ebc742007-07-27 15:43:22 +02004416 while (1) {
Marco Porschd012a602012-10-10 12:39:50 -07004417 skb = skb_dequeue(&ps->bc_buf);
Johannes Berge2ebc742007-07-27 15:43:22 +02004418 if (!skb)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03004419 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02004420 local->total_ps_buffered--;
4421
Marco Porschd012a602012-10-10 12:39:50 -07004422 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
Johannes Berge2ebc742007-07-27 15:43:22 +02004423 struct ieee80211_hdr *hdr =
4424 (struct ieee80211_hdr *) skb->data;
4425 /* more buffered multicast/broadcast frames ==> set
4426 * MoreData flag in IEEE 802.11 header to inform PS
4427 * STAs */
4428 hdr->frame_control |=
4429 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4430 }
4431
Michael Braun112c44b2014-03-06 15:08:43 +01004432 if (sdata->vif.type == NL80211_IFTYPE_AP)
Marco Porsch7cbf9d02013-03-01 16:01:18 +01004433 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
Johannes Berg7c107702015-03-20 14:18:27 +01004434 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
Johannes Berge2ebc742007-07-27 15:43:22 +02004435 break;
Felix Fietkau6b07d9c2016-08-02 11:13:41 +02004436 ieee80211_free_txskb(hw, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02004437 }
Johannes Berge039fa42008-05-15 12:55:29 +02004438
4439 info = IEEE80211_SKB_CB(skb);
4440
Johannes Berg5cf121c2008-02-25 16:27:43 +01004441 tx.flags |= IEEE80211_TX_PS_BUFFERED;
Johannes Berg4bf88532012-11-09 11:39:59 +01004442 info->band = chanctx_conf->def.chan->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02004443
Johannes Berg97b045d2008-06-20 01:22:30 +02004444 if (invoke_tx_handlers(&tx))
Johannes Berge2ebc742007-07-27 15:43:22 +02004445 skb = NULL;
Johannes Berg97b045d2008-06-20 01:22:30 +02004446 out:
Johannes Bergd0709a62008-02-25 16:27:46 +01004447 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02004448
4449 return skb;
4450}
4451EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02004452
Liad Kaufmanb6da9112014-11-19 13:47:38 +02004453int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4454{
4455 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4456 struct ieee80211_sub_if_data *sdata = sta->sdata;
4457 struct ieee80211_local *local = sdata->local;
4458 int ret;
4459 u32 queues;
4460
4461 lockdep_assert_held(&local->sta_mtx);
4462
4463 /* only some cases are supported right now */
4464 switch (sdata->vif.type) {
4465 case NL80211_IFTYPE_STATION:
4466 case NL80211_IFTYPE_AP:
4467 case NL80211_IFTYPE_AP_VLAN:
4468 break;
4469 default:
4470 WARN_ON(1);
4471 return -EINVAL;
4472 }
4473
4474 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4475 return -EINVAL;
4476
4477 if (sta->reserved_tid == tid) {
4478 ret = 0;
4479 goto out;
4480 }
4481
4482 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4483 sdata_err(sdata, "TID reservation already active\n");
4484 ret = -EALREADY;
4485 goto out;
4486 }
4487
4488 ieee80211_stop_vif_queues(sdata->local, sdata,
4489 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4490
4491 synchronize_net();
4492
4493 /* Tear down BA sessions so we stop aggregating on this TID */
Johannes Berg30686bf2015-06-02 21:39:54 +02004494 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
Liad Kaufmanb6da9112014-11-19 13:47:38 +02004495 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4496 __ieee80211_stop_tx_ba_session(sta, tid,
4497 AGG_STOP_LOCAL_REQUEST);
4498 }
4499
4500 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +02004501 __ieee80211_flush_queues(local, sdata, queues, false);
Liad Kaufmanb6da9112014-11-19 13:47:38 +02004502
4503 sta->reserved_tid = tid;
4504
4505 ieee80211_wake_vif_queues(local, sdata,
4506 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4507
Johannes Berg30686bf2015-06-02 21:39:54 +02004508 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
Liad Kaufmanb6da9112014-11-19 13:47:38 +02004509 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4510
4511 ret = 0;
4512 out:
4513 return ret;
4514}
4515EXPORT_SYMBOL(ieee80211_reserve_tid);
4516
4517void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4518{
4519 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4520 struct ieee80211_sub_if_data *sdata = sta->sdata;
4521
4522 lockdep_assert_held(&sdata->local->sta_mtx);
4523
4524 /* only some cases are supported right now */
4525 switch (sdata->vif.type) {
4526 case NL80211_IFTYPE_STATION:
4527 case NL80211_IFTYPE_AP:
4528 case NL80211_IFTYPE_AP_VLAN:
4529 break;
4530 default:
4531 WARN_ON(1);
4532 return;
4533 }
4534
4535 if (tid != sta->reserved_tid) {
4536 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4537 return;
4538 }
4539
4540 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4541}
4542EXPORT_SYMBOL(ieee80211_unreserve_tid);
4543
Johannes Berg55de9082012-07-26 17:24:39 +02004544void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4545 struct sk_buff *skb, int tid,
Johannes Berg57fbcce2016-04-12 15:56:15 +02004546 enum nl80211_band band)
Johannes Berg3b8d81e02009-06-17 17:43:56 +02004547{
Christian Lamparter353d09c2012-07-07 15:07:13 +02004548 int ac = ieee802_1d_to_ac[tid & 7];
Johannes Berg3a25a8c2012-04-03 16:28:50 +02004549
Zhang Shengjud57a5442016-03-03 01:16:56 +00004550 skb_reset_mac_header(skb);
Johannes Berg3a25a8c2012-04-03 16:28:50 +02004551 skb_set_queue_mapping(skb, ac);
Helmut Schaacf6bb792011-12-15 10:18:34 +01004552 skb->priority = tid;
Johannes Bergcf0277e2010-01-05 18:00:58 +01004553
Johannes Berg89afe612013-02-13 15:39:57 +01004554 skb->dev = sdata->dev;
4555
Johannes Berg3d34deb2009-06-18 17:25:11 +02004556 /*
4557 * The other path calling ieee80211_xmit is from the tasklet,
4558 * and while we can handle concurrent transmissions locking
4559 * requirements are that we do not come into tx with bhs on.
4560 */
4561 local_bh_disable();
Johannes Berg73c4e192014-11-09 18:50:09 +02004562 IEEE80211_SKB_CB(skb)->band = band;
Johannes Berg7c107702015-03-20 14:18:27 +01004563 ieee80211_xmit(sdata, NULL, skb);
Johannes Berg3d34deb2009-06-18 17:25:11 +02004564 local_bh_enable();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02004565}