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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>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/skbuff.h>
18#include <linux/etherdevice.h>
19#include <linux/bitmap.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040020#include <linux/rcupdate.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040021#include <linux/export.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070022#include <net/net_namespace.h>
Johannes Berge2ebc742007-07-27 15:43:22 +020023#include <net/ieee80211_radiotap.h>
24#include <net/cfg80211.h>
25#include <net/mac80211.h>
26#include <asm/unaligned.h>
27
28#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020029#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040030#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010031#include "mesh.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020032#include "wep.h"
33#include "wpa.h"
34#include "wme.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040035#include "rate.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020036
Johannes Berge2ebc742007-07-27 15:43:22 +020037/* misc utils */
38
Johannes Berg252b86c2011-11-16 15:28:55 +010039static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
Johannes Berg03f93c32008-06-25 14:36:27 +030041 int next_frag_len)
Johannes Berge2ebc742007-07-27 15:43:22 +020042{
43 int rate, mrate, erp, dur, i;
Johannes Berg2e92e6f2008-05-15 12:55:27 +020044 struct ieee80211_rate *txrate;
Johannes Berge2ebc742007-07-27 15:43:22 +020045 struct ieee80211_local *local = tx->local;
Johannes Berg8318d782008-01-24 19:38:38 +010046 struct ieee80211_supported_band *sband;
Harvey Harrison358c8d92008-07-15 18:44:13 -070047 struct ieee80211_hdr *hdr;
Johannes Berg252b86c2011-11-16 15:28:55 +010048 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berge6a98542008-10-21 12:40:02 +020049
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
52 return 0;
53
54 /* uh huh? */
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
56 return 0;
Johannes Berge2ebc742007-07-27 15:43:22 +020057
Johannes Berg2d565772012-07-23 15:12:51 +020058 sband = local->hw.wiphy->bands[info->band];
Johannes Berge6a98542008-10-21 12:40:02 +020059 txrate = &sband->bitrates[info->control.rates[0].idx];
Johannes Berg8318d782008-01-24 19:38:38 +010060
Johannes Berge6a98542008-10-21 12:40:02 +020061 erp = txrate->flags & IEEE80211_RATE_ERP_G;
Johannes Berge2ebc742007-07-27 15:43:22 +020062
63 /*
64 * data and mgmt (except PS Poll):
65 * - during CFP: 32768
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
72 *
73 * IEEE 802.11, 9.6:
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
78 * BSSBasicRateSet
79 */
Johannes Berg252b86c2011-11-16 15:28:55 +010080 hdr = (struct ieee80211_hdr *)skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -070081 if (ieee80211_is_ctl(hdr->frame_control)) {
Johannes Berge2ebc742007-07-27 15:43:22 +020082 /* TODO: These control frames are not currently sent by
Johannes Bergccd7b362008-09-11 00:01:56 +020083 * mac80211, but should they be implemented, this function
Johannes Berge2ebc742007-07-27 15:43:22 +020084 * needs to be updated to support duration field calculation.
85 *
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
93 * and its SIFS
94 * PS Poll: BIT(15) | BIT(14) | aid
95 */
96 return 0;
97 }
98
99 /* data/mgmt */
100 if (0 /* FIX: data/mgmt during CFP */)
Johannes Berg03f93c32008-06-25 14:36:27 +0300101 return cpu_to_le16(32768);
Johannes Berge2ebc742007-07-27 15:43:22 +0200102
103 if (group_addr) /* Group address as the destination - no ACK */
104 return 0;
105
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
115 */
116 rate = -1;
Johannes Berg8318d782008-01-24 19:38:38 +0100117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
121
122 if (r->bitrate > txrate->bitrate)
Johannes Berge2ebc742007-07-27 15:43:22 +0200123 break;
124
Johannes Bergbda39332008-10-11 01:51:51 +0200125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
Johannes Berg8318d782008-01-24 19:38:38 +0100126 rate = r->bitrate;
Johannes Berge2ebc742007-07-27 15:43:22 +0200127
Johannes Berg8318d782008-01-24 19:38:38 +0100128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
130 u32 flag;
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
133 else
134 flag = IEEE80211_RATE_MANDATORY_B;
135 if (r->flags & flag)
136 mrate = r->bitrate;
137 break;
138 }
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
141 mrate = r->bitrate;
142 break;
Vladimir Kondratiev3a0c52a2012-07-02 09:32:32 +0300143 case IEEE80211_BAND_60GHZ:
144 /* TODO, for now fall through */
Johannes Berg8318d782008-01-24 19:38:38 +0100145 case IEEE80211_NUM_BANDS:
146 WARN_ON(1);
147 break;
148 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200149 }
150 if (rate == -1) {
151 /* No matching basic rate found; use highest suitable mandatory
152 * PHY rate */
153 rate = mrate;
154 }
155
Simon Wunderlich6674f212011-11-21 21:34:30 +0100156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr->frame_control) &&
Claudio Pisac26a0e12012-05-28 13:06:25 +0100158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
Simon Wunderlich6674f212011-11-21 21:34:30 +0100159 dur = 0;
160 else
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
Michal Kazior4ee73f32012-04-11 08:47:56 +0200164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
Johannes Bergbda39332008-10-11 01:51:51 +0200165 tx->sdata->vif.bss_conf.use_short_preamble);
Johannes Berge2ebc742007-07-27 15:43:22 +0200166
167 if (next_frag_len) {
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur *= 2; /* ACK + SIFS */
171 /* next fragment */
Michal Kazior4ee73f32012-04-11 08:47:56 +0200172 dur += ieee80211_frame_duration(sband->band, next_frag_len,
Johannes Berg8318d782008-01-24 19:38:38 +0100173 txrate->bitrate, erp,
Johannes Bergbda39332008-10-11 01:51:51 +0200174 tx->sdata->vif.bss_conf.use_short_preamble);
Johannes Berge2ebc742007-07-27 15:43:22 +0200175 }
176
Johannes Berg03f93c32008-06-25 14:36:27 +0300177 return cpu_to_le16(dur);
Johannes Berge2ebc742007-07-27 15:43:22 +0200178}
179
Johannes Berge2ebc742007-07-27 15:43:22 +0200180/* tx handlers */
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200181static ieee80211_tx_result debug_noinline
182ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
183{
184 struct ieee80211_local *local = tx->local;
Kalle Valo0c742112010-01-12 10:42:53 +0200185 struct ieee80211_if_managed *ifmgd;
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200186
187 /* driver doesn't support power save */
188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
189 return TX_CONTINUE;
190
191 /* hardware does dynamic power save */
192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
193 return TX_CONTINUE;
194
195 /* dynamic power save disabled */
196 if (local->hw.conf.dynamic_ps_timeout <= 0)
197 return TX_CONTINUE;
198
199 /* we are scanning, don't enable power save */
200 if (local->scanning)
201 return TX_CONTINUE;
202
203 if (!local->ps_sdata)
204 return TX_CONTINUE;
205
206 /* No point if we're going to suspend */
207 if (local->quiescing)
208 return TX_CONTINUE;
209
Kalle Valo0c742112010-01-12 10:42:53 +0200210 /* dynamic ps is supported only in managed mode */
211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
212 return TX_CONTINUE;
213
214 ifmgd = &tx->sdata->u.mgd;
215
216 /*
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
223 * peer application.
224 *
Eliad Pellerdc41e4d2012-03-14 16:15:03 +0200225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
Kalle Valo0c742112010-01-12 10:42:53 +0200226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
228 */
Johannes Berg4875d30d2012-03-27 14:18:37 +0200229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
Kalle Valo0c742112010-01-12 10:42:53 +0200232 return TX_CONTINUE;
233
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200234 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
235 ieee80211_stop_queues_by_reason(&local->hw,
236 IEEE80211_QUEUE_STOP_REASON_PS);
Vivek Natarajandb285692011-02-18 17:18:03 +0530237 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200238 ieee80211_queue_work(&local->hw,
239 &local->dynamic_ps_disable_work);
240 }
241
Luciano Coelho5db1c072011-05-03 21:40:08 +0300242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd->associated)
244 return TX_CONTINUE;
245
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200246 mod_timer(&local->dynamic_ps_timer, jiffies +
247 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
248
249 return TX_CONTINUE;
250}
Johannes Berge2ebc742007-07-27 15:43:22 +0200251
Johannes Bergd9e8a702008-06-30 15:10:44 +0200252static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100253ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200254{
Harvey Harrison358c8d92008-07-15 18:44:13 -0700255
Johannes Berge039fa42008-05-15 12:55:29 +0200256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berge039fa42008-05-15 12:55:29 +0200257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200258 bool assoc = false;
Johannes Berge2ebc742007-07-27 15:43:22 +0200259
Johannes Berge039fa42008-05-15 12:55:29 +0200260 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100261 return TX_CONTINUE;
Johannes Berg58d41852007-09-26 17:53:18 +0200262
Ben Greearb23b0252011-02-04 11:54:17 -0800263 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
Kalle Valoa9a6fff2009-03-18 14:06:44 +0200265 !ieee80211_is_probe_req(hdr->frame_control) &&
266 !ieee80211_is_nullfunc(hdr->frame_control))
267 /*
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
275 *
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
277 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100278 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200279
Bill Jordan1be7fe82010-10-01 11:20:41 -0400280 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
281 return TX_CONTINUE;
282
Johannes Berg05c914f2008-09-11 00:01:58 +0200283 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100284 return TX_CONTINUE;
285
Johannes Berg5cf121c2008-02-25 16:27:43 +0100286 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100287 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200288
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200289 if (tx->sta)
290 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
Johannes Berge2ebc742007-07-27 15:43:22 +0200291
Johannes Berg5cf121c2008-02-25 16:27:43 +0100292 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200293 if (unlikely(!assoc &&
Harvey Harrison358c8d92008-07-15 18:44:13 -0700294 ieee80211_is_data(hdr->frame_control))) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200295#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200296 sdata_info(tx->sdata,
297 "dropped data frame to not associated station %pM\n",
298 hdr->addr1);
299#endif
Johannes Berge2ebc742007-07-27 15:43:22 +0200300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100301 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200302 }
Johannes Berg29623892011-12-14 12:20:31 +0100303 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
304 ieee80211_is_data(hdr->frame_control) &&
Felix Fietkau030ef8f2012-04-23 19:49:02 +0200305 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
Johannes Berg29623892011-12-14 12:20:31 +0100306 /*
307 * No associated STAs - no need to send multicast
308 * frames.
309 */
310 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200311 }
312
Johannes Berg9ae54c82008-01-31 19:48:20 +0100313 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200314}
315
Johannes Berge2ebc742007-07-27 15:43:22 +0200316/* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320static void purge_old_ps_buffers(struct ieee80211_local *local)
321{
322 int total = 0, purged = 0;
323 struct sk_buff *skb;
324 struct ieee80211_sub_if_data *sdata;
325 struct sta_info *sta;
326
Johannes Berg79010422007-09-18 17:29:21 -0400327 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Marco Porschd012a602012-10-10 12:39:50 -0700328 struct ps_data *ps;
329
330 if (sdata->vif.type == NL80211_IFTYPE_AP)
331 ps = &sdata->u.ap.ps;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100332 else if (ieee80211_vif_is_mesh(&sdata->vif))
333 ps = &sdata->u.mesh.ps;
Marco Porschd012a602012-10-10 12:39:50 -0700334 else
Johannes Berge2ebc742007-07-27 15:43:22 +0200335 continue;
Marco Porschd012a602012-10-10 12:39:50 -0700336
337 skb = skb_dequeue(&ps->bc_buf);
Johannes Berge2ebc742007-07-27 15:43:22 +0200338 if (skb) {
339 purged++;
340 dev_kfree_skb(skb);
341 }
Marco Porschd012a602012-10-10 12:39:50 -0700342 total += skb_queue_len(&ps->bc_buf);
Johannes Berge2ebc742007-07-27 15:43:22 +0200343 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200344
Johannes Berg948d8872011-09-29 16:04:29 +0200345 /*
346 * Drop one frame from each station from the lowest-priority
347 * AC that has frames at all.
348 */
Johannes Bergd0709a62008-02-25 16:27:46 +0100349 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Berg948d8872011-09-29 16:04:29 +0200350 int ac;
351
352 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
353 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
354 total += skb_queue_len(&sta->ps_tx_buf[ac]);
355 if (skb) {
356 purged++;
Felix Fietkauc3e77242012-10-08 14:39:33 +0200357 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg948d8872011-09-29 16:04:29 +0200358 break;
359 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200360 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200361 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100362
Johannes Berge2ebc742007-07-27 15:43:22 +0200363 local->total_ps_buffered = total;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200364 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
Johannes Berge2ebc742007-07-27 15:43:22 +0200365}
366
Johannes Berg9ae54c82008-01-31 19:48:20 +0100367static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100368ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200369{
Johannes Berge039fa42008-05-15 12:55:29 +0200370 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Marco Porschd012a602012-10-10 12:39:50 -0700372 struct ps_data *ps;
Johannes Berge039fa42008-05-15 12:55:29 +0200373
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100374 /*
375 * broadcast/multicast frame
376 *
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100377 * If any of the associated/peer stations is in power save mode,
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100378 * the frame is buffered to be sent after DTIM beacon frame.
379 * This is done either by the hardware or us.
380 */
381
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100382 /* powersaving STAs currently only in AP/VLAN/mesh mode */
Marco Porschd012a602012-10-10 12:39:50 -0700383 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
384 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
385 if (!tx->sdata->bss)
386 return TX_CONTINUE;
387
388 ps = &tx->sdata->bss->ps;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100389 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
390 ps = &tx->sdata->u.mesh.ps;
Marco Porschd012a602012-10-10 12:39:50 -0700391 } else {
Johannes Berg3e122be2008-07-09 14:40:34 +0200392 return TX_CONTINUE;
Marco Porschd012a602012-10-10 12:39:50 -0700393 }
394
Johannes Berg3e122be2008-07-09 14:40:34 +0200395
396 /* no buffering for ordered frames */
Harvey Harrison358c8d92008-07-15 18:44:13 -0700397 if (ieee80211_has_order(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100398 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100399
400 /* no stations in PS mode */
Marco Porschd012a602012-10-10 12:39:50 -0700401 if (!atomic_read(&ps->num_sta_ps))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100402 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100403
Johannes Berg62b517c2009-10-29 12:19:21 +0100404 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
Johannes Berg3a25a8c2012-04-03 16:28:50 +0200405 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
406 info->hw_queue = tx->sdata->vif.cab_queue;
Johannes Berg62b12082009-08-10 16:04:15 +0200407
Johannes Berg62b517c2009-10-29 12:19:21 +0100408 /* device releases frame after DTIM beacon */
409 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
Johannes Berg62b12082009-08-10 16:04:15 +0200410 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200411
Johannes Berg62b12082009-08-10 16:04:15 +0200412 /* buffered in mac80211 */
413 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
414 purge_old_ps_buffers(tx->local);
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100415
Marco Porschd012a602012-10-10 12:39:50 -0700416 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200417 ps_dbg(tx->sdata,
418 "BC TX buffer full - dropping the oldest frame\n");
Marco Porschd012a602012-10-10 12:39:50 -0700419 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
Johannes Berg62b12082009-08-10 16:04:15 +0200420 } else
421 tx->local->total_ps_buffered++;
422
Marco Porschd012a602012-10-10 12:39:50 -0700423 skb_queue_tail(&ps->bc_buf, tx->skb);
Johannes Berg62b12082009-08-10 16:04:15 +0200424
425 return TX_QUEUED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200426}
427
Jouni Malinenfb733332009-01-08 13:32:00 +0200428static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
429 struct sk_buff *skb)
430{
431 if (!ieee80211_is_mgmt(fc))
432 return 0;
433
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200434 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
Jouni Malinenfb733332009-01-08 13:32:00 +0200435 return 0;
436
437 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
438 skb->data))
439 return 0;
440
441 return 1;
442}
443
Johannes Berg9ae54c82008-01-31 19:48:20 +0100444static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100445ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200446{
447 struct sta_info *sta = tx->sta;
Johannes Berge039fa42008-05-15 12:55:29 +0200448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700449 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300450 struct ieee80211_local *local = tx->local;
Johannes Berge2ebc742007-07-27 15:43:22 +0200451
Johannes Berg02f2f1a2012-02-27 12:18:30 +0100452 if (unlikely(!sta))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100453 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200454
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200455 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
456 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
Johannes Berg02f2f1a2012-02-27 12:18:30 +0100457 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
Johannes Berg948d8872011-09-29 16:04:29 +0200458 int ac = skb_get_queue_mapping(tx->skb);
459
Johannes Berg02f2f1a2012-02-27 12:18:30 +0100460 /* only deauth, disassoc and action are bufferable MMPDUs */
461 if (ieee80211_is_mgmt(hdr->frame_control) &&
462 !ieee80211_is_deauth(hdr->frame_control) &&
463 !ieee80211_is_disassoc(hdr->frame_control) &&
464 !ieee80211_is_action(hdr->frame_control)) {
465 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
466 return TX_CONTINUE;
467 }
468
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200469 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
470 sta->sta.addr, sta->sta.aid, ac);
Johannes Berge2ebc742007-07-27 15:43:22 +0200471 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
472 purge_old_ps_buffers(tx->local);
Johannes Berg948d8872011-09-29 16:04:29 +0200473 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
474 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200475 ps_dbg(tx->sdata,
476 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
477 sta->sta.addr, ac);
Felix Fietkauc3e77242012-10-08 14:39:33 +0200478 ieee80211_free_txskb(&local->hw, old);
Johannes Berge2ebc742007-07-27 15:43:22 +0200479 } else
480 tx->local->total_ps_buffered++;
Johannes Berg004c8722008-02-20 11:21:35 +0100481
Johannes Berge039fa42008-05-15 12:55:29 +0200482 info->control.jiffies = jiffies;
Johannes Berg5061b0c2009-07-14 00:33:34 +0200483 info->control.vif = &tx->sdata->vif;
Johannes Berg8f77f382009-06-07 21:58:37 +0200484 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berg948d8872011-09-29 16:04:29 +0200485 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300486
487 if (!timer_pending(&local->sta_cleanup))
488 mod_timer(&local->sta_cleanup,
489 round_jiffies(jiffies +
490 STA_INFO_CLEANUP_INTERVAL));
491
Johannes Bergc868cb352011-09-29 16:04:27 +0200492 /*
493 * We queued up some frames, so the TIM bit might
494 * need to be set, recalculate it.
495 */
496 sta_info_recalc_tim(sta);
497
Johannes Berg9ae54c82008-01-31 19:48:20 +0100498 return TX_QUEUED;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200499 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
500 ps_dbg(tx->sdata,
501 "STA %pM in PS mode, but polling/in SP -> send frame\n",
502 sta->sta.addr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200503 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200504
Johannes Berg9ae54c82008-01-31 19:48:20 +0100505 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200506}
507
Johannes Bergd9e8a702008-06-30 15:10:44 +0200508static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100509ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200510{
Johannes Berg5cf121c2008-02-25 16:27:43 +0100511 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100512 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200513
Johannes Berg5cf121c2008-02-25 16:27:43 +0100514 if (tx->flags & IEEE80211_TX_UNICAST)
Johannes Berge2ebc742007-07-27 15:43:22 +0200515 return ieee80211_tx_h_unicast_ps_buf(tx);
516 else
517 return ieee80211_tx_h_multicast_ps_buf(tx);
518}
519
Johannes Bergd9e8a702008-06-30 15:10:44 +0200520static ieee80211_tx_result debug_noinline
Johannes Berga621fa42010-08-27 14:26:54 +0300521ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
522{
523 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
524
525 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
526 tx->sdata->control_port_no_encrypt))
527 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
528
529 return TX_CONTINUE;
530}
531
532static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100533ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200534{
Johannes Berg46e6de12012-07-04 18:10:07 +0200535 struct ieee80211_key *key;
Johannes Berge039fa42008-05-15 12:55:29 +0200536 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700537 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400538
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200539 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
Johannes Berge2ebc742007-07-27 15:43:22 +0200540 tx->key = NULL;
Johannes Berge31b8212010-10-05 19:39:30 +0200541 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
Johannes Bergd4e46a32007-09-14 11:10:24 -0400542 tx->key = key;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200543 else if (ieee80211_is_mgmt(hdr->frame_control) &&
Jouni Malinenecbcd322010-03-29 23:35:23 -0700544 is_multicast_ether_addr(hdr->addr1) &&
545 ieee80211_is_robust_mgmt_frame(hdr) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200546 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
547 tx->key = key;
Johannes Bergf7e01042010-12-09 19:49:02 +0100548 else if (is_multicast_ether_addr(hdr->addr1) &&
549 (key = rcu_dereference(tx->sdata->default_multicast_key)))
550 tx->key = key;
551 else if (!is_multicast_ether_addr(hdr->addr1) &&
552 (key = rcu_dereference(tx->sdata->default_unicast_key)))
Johannes Bergd4e46a32007-09-14 11:10:24 -0400553 tx->key = key;
Johannes Berg46e6de12012-07-04 18:10:07 +0200554 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
555 tx->key = NULL;
556 else if (!tx->sdata->drop_unencrypted)
557 tx->key = NULL;
558 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
559 tx->key = NULL;
560 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
561 !(ieee80211_is_action(hdr->frame_control) &&
562 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
563 tx->key = NULL;
Nicolas Cavallari4922f712012-07-04 18:10:08 +0200564 else if (ieee80211_is_mgmt(hdr->frame_control) &&
565 !ieee80211_is_robust_mgmt_frame(hdr))
566 tx->key = NULL;
Johannes Berg46e6de12012-07-04 18:10:07 +0200567 else {
Johannes Berge2ebc742007-07-27 15:43:22 +0200568 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100569 return TX_DROP;
Johannes Berg46e6de12012-07-04 18:10:07 +0200570 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200571
572 if (tx->key) {
Johannes Berg813d7662010-01-17 01:47:58 +0100573 bool skip_hw = false;
574
Johannes Berge2ebc742007-07-27 15:43:22 +0200575 tx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400576 /* TODO: add threshold stuff again */
Johannes Berg176e4f82007-12-18 15:27:47 +0100577
Johannes Berg97359d12010-08-10 09:46:38 +0200578 switch (tx->key->conf.cipher) {
579 case WLAN_CIPHER_SUITE_WEP40:
580 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berg97359d12010-08-10 09:46:38 +0200581 case WLAN_CIPHER_SUITE_TKIP:
Harvey Harrison358c8d92008-07-15 18:44:13 -0700582 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg176e4f82007-12-18 15:27:47 +0100583 tx->key = NULL;
584 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200585 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinenfb733332009-01-08 13:32:00 +0200586 if (!ieee80211_is_data_present(hdr->frame_control) &&
587 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
588 tx->skb))
589 tx->key = NULL;
Kalle Valo3b43a182010-01-23 20:27:14 +0200590 else
591 skip_hw = (tx->key->conf.flags &
Johannes Berge548c492012-09-04 17:08:23 +0200592 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
Kalle Valo3b43a182010-01-23 20:27:14 +0200593 ieee80211_is_mgmt(hdr->frame_control);
Jouni Malinenfb733332009-01-08 13:32:00 +0200594 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200595 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200596 if (!ieee80211_is_mgmt(hdr->frame_control))
597 tx->key = NULL;
598 break;
Johannes Berg176e4f82007-12-18 15:27:47 +0100599 }
Johannes Berg813d7662010-01-17 01:47:58 +0100600
Johannes Berge54faf22013-01-29 11:41:38 +0100601 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
602 !ieee80211_is_deauth(hdr->frame_control)))
Johannes Berg95acac62011-07-12 12:30:59 +0200603 return TX_DROP;
604
Johannes Bergf12553e2010-01-22 22:07:59 +0100605 if (!skip_hw && tx->key &&
Johannes Berg382b1652010-01-25 11:36:16 +0100606 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
Johannes Berg813d7662010-01-17 01:47:58 +0100607 info->control.hw_key = &tx->key->conf;
Johannes Berge2ebc742007-07-27 15:43:22 +0200608 }
609
Johannes Berg9ae54c82008-01-31 19:48:20 +0100610 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200611}
612
Johannes Bergd9e8a702008-06-30 15:10:44 +0200613static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100614ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200615{
Johannes Berge039fa42008-05-15 12:55:29 +0200616 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200617 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
618 struct ieee80211_supported_band *sband;
619 struct ieee80211_rate *rate;
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700620 int i;
621 u32 len;
Johannes Berge6a98542008-10-21 12:40:02 +0200622 bool inval = false, rts = false, short_preamble = false;
623 struct ieee80211_tx_rate_control txrc;
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200624 bool assoc = false;
Johannes Berge6a98542008-10-21 12:40:02 +0200625
626 memset(&txrc, 0, sizeof(txrc));
Johannes Berg8318d782008-01-24 19:38:38 +0100627
Johannes Berg2d565772012-07-23 15:12:51 +0200628 sband = tx->local->hw.wiphy->bands[info->band];
Johannes Berge2ebc742007-07-27 15:43:22 +0200629
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700630 len = min_t(u32, tx->skb->len + FCS_LEN,
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200631 tx->local->hw.wiphy->frag_threshold);
Johannes Berg58d41852007-09-26 17:53:18 +0200632
Johannes Berge6a98542008-10-21 12:40:02 +0200633 /* set up the tx rate control struct we give the RC algo */
Johannes Berg005e4722012-02-26 11:24:35 +0100634 txrc.hw = &tx->local->hw;
Johannes Berge6a98542008-10-21 12:40:02 +0200635 txrc.sband = sband;
636 txrc.bss_conf = &tx->sdata->vif.bss_conf;
637 txrc.skb = tx->skb;
638 txrc.reported_rate.idx = -1;
Johannes Berg2d565772012-07-23 15:12:51 +0200639 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200640 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
641 txrc.max_rate_idx = -1;
642 else
643 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Simon Wunderlich19468412012-01-28 17:25:33 +0100644 memcpy(txrc.rate_idx_mcs_mask,
Johannes Berg2d565772012-07-23 15:12:51 +0200645 tx->sdata->rc_rateidx_mcs_mask[info->band],
Simon Wunderlich19468412012-01-28 17:25:33 +0100646 sizeof(txrc.rate_idx_mcs_mask));
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100647 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
Chun-Yeow Yeoh4bb62342011-11-24 17:15:20 -0800648 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100649 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
Johannes Berg58d41852007-09-26 17:53:18 +0200650
Johannes Berge6a98542008-10-21 12:40:02 +0200651 /* set up RTS protection if desired */
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200652 if (len > tx->local->hw.wiphy->rts_threshold) {
Johannes Berge6a98542008-10-21 12:40:02 +0200653 txrc.rts = rts = true;
Johannes Berge2ebc742007-07-27 15:43:22 +0200654 }
Johannes Berge6a98542008-10-21 12:40:02 +0200655
656 /*
657 * Use short preamble if the BSS can handle it, but not for
658 * management frames unless we know the receiver can handle
659 * that -- the management frame might be to a station that
660 * just wants a probe response.
661 */
662 if (tx->sdata->vif.bss_conf.use_short_preamble &&
663 (ieee80211_is_data(hdr->frame_control) ||
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200664 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
Johannes Berge6a98542008-10-21 12:40:02 +0200665 txrc.short_preamble = short_preamble = true;
666
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200667 if (tx->sta)
668 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
Johannes Berge6a98542008-10-21 12:40:02 +0200669
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700670 /*
671 * Lets not bother rate control if we're associated and cannot
672 * talk to the sta. This should not happen.
673 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200674 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700675 !rate_usable_index_exists(sband, &tx->sta->sta),
676 "%s: Dropped data frame as no usable bitrate found while "
677 "scanning and associated. Target station: "
678 "%pM on %d GHz band\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100679 tx->sdata->name, hdr->addr1,
Johannes Berg2d565772012-07-23 15:12:51 +0200680 info->band ? 5 : 2))
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700681 return TX_DROP;
682
683 /*
684 * If we're associated with the sta at this point we know we can at
685 * least send the frame at the lowest bit rate.
686 */
Johannes Berge6a98542008-10-21 12:40:02 +0200687 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
688
689 if (unlikely(info->control.rates[0].idx < 0))
690 return TX_DROP;
691
Helmut Schaac1ce5a72010-12-01 16:34:45 +0100692 if (txrc.reported_rate.idx < 0) {
Johannes Berge6a98542008-10-21 12:40:02 +0200693 txrc.reported_rate = info->control.rates[0];
Helmut Schaac1ce5a72010-12-01 16:34:45 +0100694 if (tx->sta && ieee80211_is_data(hdr->frame_control))
695 tx->sta->last_tx_rate = txrc.reported_rate;
696 } else if (tx->sta)
Johannes Berge6a98542008-10-21 12:40:02 +0200697 tx->sta->last_tx_rate = txrc.reported_rate;
698
699 if (unlikely(!info->control.rates[0].count))
700 info->control.rates[0].count = 1;
701
Gábor Stefanik99551512009-04-23 19:36:14 +0200702 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
703 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
704 info->control.rates[0].count = 1;
705
Johannes Berge6a98542008-10-21 12:40:02 +0200706 if (is_multicast_ether_addr(hdr->addr1)) {
707 /*
708 * XXX: verify the rate is in the basic rateset
709 */
710 return TX_CONTINUE;
711 }
712
713 /*
714 * set up the RTS/CTS rate as the fastest basic rate
715 * that is not faster than the data rate
716 *
717 * XXX: Should this check all retry rates?
718 */
719 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
720 s8 baserate = 0;
721
722 rate = &sband->bitrates[info->control.rates[0].idx];
723
724 for (i = 0; i < sband->n_bitrates; i++) {
725 /* must be a basic rate */
726 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
727 continue;
728 /* must not be faster than the data rate */
729 if (sband->bitrates[i].bitrate > rate->bitrate)
730 continue;
731 /* maximum */
732 if (sband->bitrates[baserate].bitrate <
733 sband->bitrates[i].bitrate)
734 baserate = i;
735 }
736
737 info->control.rts_cts_rate_idx = baserate;
738 }
739
740 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
741 /*
742 * make sure there's no valid rate following
743 * an invalid one, just in case drivers don't
744 * take the API seriously to stop at -1.
745 */
746 if (inval) {
747 info->control.rates[i].idx = -1;
748 continue;
749 }
750 if (info->control.rates[i].idx < 0) {
751 inval = true;
752 continue;
753 }
754
755 /*
756 * For now assume MCS is already set up correctly, this
757 * needs to be fixed.
758 */
759 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
760 WARN_ON(info->control.rates[i].idx > 76);
761 continue;
762 }
763
764 /* set up RTS protection if desired */
765 if (rts)
766 info->control.rates[i].flags |=
767 IEEE80211_TX_RC_USE_RTS_CTS;
768
769 /* RC is busted */
Sujith075cbc92008-10-23 12:14:02 +0530770 if (WARN_ON_ONCE(info->control.rates[i].idx >=
771 sband->n_bitrates)) {
Johannes Berge6a98542008-10-21 12:40:02 +0200772 info->control.rates[i].idx = -1;
773 continue;
774 }
775
776 rate = &sband->bitrates[info->control.rates[i].idx];
777
778 /* set up short preamble */
779 if (short_preamble &&
780 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
781 info->control.rates[i].flags |=
782 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
783
784 /* set up G protection */
785 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
786 rate->flags & IEEE80211_RATE_ERP_G)
787 info->control.rates[i].flags |=
788 IEEE80211_TX_RC_USE_CTS_PROTECT;
789 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200790
Johannes Berg9ae54c82008-01-31 19:48:20 +0100791 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200792}
793
Johannes Bergd9e8a702008-06-30 15:10:44 +0200794static ieee80211_tx_result debug_noinline
Johannes Bergf591fa52008-07-10 11:21:26 +0200795ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
796{
797 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
798 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
799 u16 *seq;
800 u8 *qc;
801 int tid;
802
Johannes Berg25d834e2008-09-12 22:52:47 +0200803 /*
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
807 */
Johannes Berg5061b0c2009-07-14 00:33:34 +0200808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
Johannes Berg25d834e2008-09-12 22:52:47 +0200809 return TX_CONTINUE;
810
Johannes Bergf591fa52008-07-10 11:21:26 +0200811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
812 return TX_CONTINUE;
813
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
815 return TX_CONTINUE;
816
Johannes Berg49a59542011-09-29 16:04:41 +0200817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818 return TX_CONTINUE;
819
Johannes Berg94778282008-10-10 13:21:59 +0200820 /*
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
823 * counter.
824 */
Johannes Bergf591fa52008-07-10 11:21:26 +0200825 if (!ieee80211_is_data_qos(hdr->frame_control)) {
Johannes Berg94778282008-10-10 13:21:59 +0200826 /* driver should assign sequence number */
Johannes Bergf591fa52008-07-10 11:21:26 +0200827 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
Johannes Berg94778282008-10-10 13:21:59 +0200828 /* for pure STA mode without beacons, we can do it */
829 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
830 tx->sdata->sequence_number += 0x10;
Johannes Bergf591fa52008-07-10 11:21:26 +0200831 return TX_CONTINUE;
832 }
833
834 /*
835 * This should be true for injected/management frames only, for
836 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
837 * above since they are not QoS-data frames.
838 */
839 if (!tx->sta)
840 return TX_CONTINUE;
841
842 /* include per-STA, per-TID sequence counter */
843
844 qc = ieee80211_get_qos_ctl(hdr);
845 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
846 seq = &tx->sta->tid_seq[tid];
847
848 hdr->seq_ctrl = cpu_to_le16(*seq);
849
850 /* Increase the sequence number. */
851 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
852
853 return TX_CONTINUE;
854}
855
Johannes Berg252b86c2011-11-16 15:28:55 +0100856static int ieee80211_fragment(struct ieee80211_tx_data *tx,
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100857 struct sk_buff *skb, int hdrlen,
858 int frag_threshold)
859{
Johannes Berg252b86c2011-11-16 15:28:55 +0100860 struct ieee80211_local *local = tx->local;
Johannes Berga1a3fce2011-11-16 15:28:56 +0100861 struct ieee80211_tx_info *info;
Johannes Berg252b86c2011-11-16 15:28:55 +0100862 struct sk_buff *tmp;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100863 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
864 int pos = hdrlen + per_fragm;
865 int rem = skb->len - hdrlen - per_fragm;
866
867 if (WARN_ON(rem < 0))
868 return -EINVAL;
869
Johannes Berg252b86c2011-11-16 15:28:55 +0100870 /* first fragment was already added to queue by caller */
871
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100872 while (rem) {
873 int fraglen = per_fragm;
874
875 if (fraglen > rem)
876 fraglen = rem;
877 rem -= fraglen;
878 tmp = dev_alloc_skb(local->tx_headroom +
879 frag_threshold +
880 IEEE80211_ENCRYPT_HEADROOM +
881 IEEE80211_ENCRYPT_TAILROOM);
882 if (!tmp)
883 return -ENOMEM;
Johannes Berg252b86c2011-11-16 15:28:55 +0100884
885 __skb_queue_tail(&tx->skbs, tmp);
886
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100887 skb_reserve(tmp, local->tx_headroom +
888 IEEE80211_ENCRYPT_HEADROOM);
889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
Johannes Berga1a3fce2011-11-16 15:28:56 +0100891
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
895
896 if (rem)
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100901 tmp->dev = skb->dev;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100902
903 /* copy header and data */
904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
906
907 pos += fraglen;
908 }
909
Johannes Berg252b86c2011-11-16 15:28:55 +0100910 /* adjust first fragment's length */
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100911 skb->len = hdrlen + per_fragm;
912 return 0;
913}
914
Johannes Bergf591fa52008-07-10 11:21:26 +0200915static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200916ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917{
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100922 int hdrlen;
923 int fragnum;
Johannes Berge2454942008-05-15 12:55:28 +0200924
Johannes Berg252b86c2011-11-16 15:28:55 +0100925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
927 tx->skb = NULL;
928
Johannes Berga26eb272011-10-07 14:01:25 +0200929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930 return TX_CONTINUE;
931
932 if (tx->local->ops->set_frag_threshold)
Johannes Berge2454942008-05-15 12:55:28 +0200933 return TX_CONTINUE;
934
Johannes Bergeefce912008-05-17 00:57:13 +0200935 /*
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200937 * This scenario is handled in ieee80211_tx_prepare but extra
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +0300938 * caution taken here as fragmented ampdu may cause Tx stop.
Johannes Bergeefce912008-05-17 00:57:13 +0200939 */
Sujith8b30b1f2008-10-24 09:55:27 +0530940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Bergeefce912008-05-17 00:57:13 +0200941 return TX_DROP;
942
Harvey Harrison065e96052008-06-22 16:45:27 -0700943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2454942008-05-15 12:55:28 +0200944
Johannes Berga26eb272011-10-07 14:01:25 +0200945 /* internal error, why isn't DONTFRAG set? */
Johannes Berg8ccd8f22009-04-29 23:35:56 +0200946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100947 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200948
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100949 /*
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
956 */
Johannes Berg252b86c2011-11-16 15:28:55 +0100957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100958 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200959
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100960 /* update duration/seq/flags of fragments */
961 fragnum = 0;
Johannes Berg252b86c2011-11-16 15:28:55 +0100962
963 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
Johannes Berge2454942008-05-15 12:55:28 +0200965
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200968
Johannes Berg252b86c2011-11-16 15:28:55 +0100969 if (!skb_queue_is_last(&tx->skbs, skb)) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100970 hdr->frame_control |= morefrags;
Johannes Berge6a98542008-10-21 12:40:02 +0200971 /*
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
974 */
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
Thomas Huehne3e1a0b2012-07-02 19:46:16 +0200978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
Johannes Berge6a98542008-10-21 12:40:02 +0200979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100980 } else {
981 hdr->frame_control &= ~morefrags;
Johannes Berge6a98542008-10-21 12:40:02 +0200982 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
984 fragnum++;
Johannes Berg252b86c2011-11-16 15:28:55 +0100985 }
Johannes Berge2454942008-05-15 12:55:28 +0200986
987 return TX_CONTINUE;
Johannes Berge2454942008-05-15 12:55:28 +0200988}
989
Johannes Bergd9e8a702008-06-30 15:10:44 +0200990static ieee80211_tx_result debug_noinline
Johannes Bergfeff1f22009-08-10 16:01:54 +0200991ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
992{
Johannes Berg252b86c2011-11-16 15:28:55 +0100993 struct sk_buff *skb;
Johannes Bergfeff1f22009-08-10 16:01:54 +0200994
995 if (!tx->sta)
996 return TX_CONTINUE;
997
998 tx->sta->tx_packets++;
Johannes Berg252b86c2011-11-16 15:28:55 +0100999 skb_queue_walk(&tx->skbs, skb) {
Johannes Bergfeff1f22009-08-10 16:01:54 +02001000 tx->sta->tx_fragments++;
1001 tx->sta->tx_bytes += skb->len;
Johannes Berg252b86c2011-11-16 15:28:55 +01001002 }
Johannes Bergfeff1f22009-08-10 16:01:54 +02001003
1004 return TX_CONTINUE;
1005}
1006
1007static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +02001008ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1009{
1010 if (!tx->key)
1011 return TX_CONTINUE;
1012
Johannes Berg97359d12010-08-10 09:46:38 +02001013 switch (tx->key->conf.cipher) {
1014 case WLAN_CIPHER_SUITE_WEP40:
1015 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berge2454942008-05-15 12:55:28 +02001016 return ieee80211_crypto_wep_encrypt(tx);
Johannes Berg97359d12010-08-10 09:46:38 +02001017 case WLAN_CIPHER_SUITE_TKIP:
Johannes Berge2454942008-05-15 12:55:28 +02001018 return ieee80211_crypto_tkip_encrypt(tx);
Johannes Berg97359d12010-08-10 09:46:38 +02001019 case WLAN_CIPHER_SUITE_CCMP:
Johannes Berge2454942008-05-15 12:55:28 +02001020 return ieee80211_crypto_ccmp_encrypt(tx);
Johannes Berg97359d12010-08-10 09:46:38 +02001021 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001022 return ieee80211_crypto_aes_cmac_encrypt(tx);
Johannes Berg3ffc2a92010-08-27 14:26:52 +03001023 default:
Yoni Divinskyd32a1022012-01-16 15:18:59 +02001024 return ieee80211_crypto_hw_encrypt(tx);
Johannes Berge2454942008-05-15 12:55:28 +02001025 }
1026
Johannes Berge2454942008-05-15 12:55:28 +02001027 return TX_DROP;
1028}
1029
Johannes Bergd9e8a702008-06-30 15:10:44 +02001030static ieee80211_tx_result debug_noinline
Johannes Berg03f93c32008-06-25 14:36:27 +03001031ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1032{
Johannes Berg252b86c2011-11-16 15:28:55 +01001033 struct sk_buff *skb;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001034 struct ieee80211_hdr *hdr;
1035 int next_len;
1036 bool group_addr;
Johannes Berg03f93c32008-06-25 14:36:27 +03001037
Johannes Berg252b86c2011-11-16 15:28:55 +01001038 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001039 hdr = (void *) skb->data;
Jouni Malinen7e0aae42009-05-19 19:25:58 +03001040 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1041 break; /* must not overwrite AID */
Johannes Berg252b86c2011-11-16 15:28:55 +01001042 if (!skb_queue_is_last(&tx->skbs, skb)) {
1043 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1044 next_len = next->len;
1045 } else
1046 next_len = 0;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001047 group_addr = is_multicast_ether_addr(hdr->addr1);
Johannes Berg03f93c32008-06-25 14:36:27 +03001048
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001049 hdr->duration_id =
Johannes Berg252b86c2011-11-16 15:28:55 +01001050 ieee80211_duration(tx, skb, group_addr, next_len);
1051 }
Johannes Berg03f93c32008-06-25 14:36:27 +03001052
1053 return TX_CONTINUE;
1054}
1055
Johannes Berge2ebc742007-07-27 15:43:22 +02001056/* actual transmit path */
1057
Johannes Berga622ab72010-06-10 10:21:39 +02001058static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1059 struct sk_buff *skb,
1060 struct ieee80211_tx_info *info,
1061 struct tid_ampdu_tx *tid_tx,
1062 int tid)
1063{
1064 bool queued = false;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001065 bool reset_agg_timer = false;
Helmut Schaaaa454582012-03-07 17:20:30 +01001066 struct sk_buff *purge_skb = NULL;
Johannes Berga622ab72010-06-10 10:21:39 +02001067
1068 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1069 info->flags |= IEEE80211_TX_CTL_AMPDU;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001070 reset_agg_timer = true;
Johannes Berg0ab33702010-06-10 10:21:42 +02001071 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1072 /*
1073 * nothing -- this aggregation session is being started
1074 * but that might still fail with the driver
1075 */
Johannes Berga622ab72010-06-10 10:21:39 +02001076 } else {
1077 spin_lock(&tx->sta->lock);
1078 /*
1079 * Need to re-check now, because we may get here
1080 *
1081 * 1) in the window during which the setup is actually
1082 * already done, but not marked yet because not all
1083 * packets are spliced over to the driver pending
1084 * queue yet -- if this happened we acquire the lock
1085 * either before or after the splice happens, but
1086 * need to recheck which of these cases happened.
1087 *
1088 * 2) during session teardown, if the OPERATIONAL bit
1089 * was cleared due to the teardown but the pointer
1090 * hasn't been assigned NULL yet (or we loaded it
1091 * before it was assigned) -- in this case it may
1092 * now be NULL which means we should just let the
1093 * packet pass through because splicing the frames
1094 * back is already done.
1095 */
Johannes Berg40b275b2011-05-13 14:15:49 +02001096 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
Johannes Berga622ab72010-06-10 10:21:39 +02001097
1098 if (!tid_tx) {
1099 /* do nothing, let packet pass through */
1100 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1101 info->flags |= IEEE80211_TX_CTL_AMPDU;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001102 reset_agg_timer = true;
Johannes Berga622ab72010-06-10 10:21:39 +02001103 } else {
1104 queued = true;
1105 info->control.vif = &tx->sdata->vif;
1106 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1107 __skb_queue_tail(&tid_tx->pending, skb);
Helmut Schaaaa454582012-03-07 17:20:30 +01001108 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1109 purge_skb = __skb_dequeue(&tid_tx->pending);
Johannes Berga622ab72010-06-10 10:21:39 +02001110 }
1111 spin_unlock(&tx->sta->lock);
Helmut Schaaaa454582012-03-07 17:20:30 +01001112
1113 if (purge_skb)
Felix Fietkauc3e77242012-10-08 14:39:33 +02001114 ieee80211_free_txskb(&tx->local->hw, purge_skb);
Johannes Berga622ab72010-06-10 10:21:39 +02001115 }
1116
Nikolay Martynov285fa692011-11-22 21:50:28 -05001117 /* reset session timer */
1118 if (reset_agg_timer && tid_tx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001119 tid_tx->last_tx = jiffies;
Nikolay Martynov285fa692011-11-22 21:50:28 -05001120
Johannes Berga622ab72010-06-10 10:21:39 +02001121 return queued;
1122}
1123
Johannes Berg58d41852007-09-26 17:53:18 +02001124/*
1125 * initialises @tx
1126 */
Johannes Berg9ae54c82008-01-31 19:48:20 +01001127static ieee80211_tx_result
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001128ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1129 struct ieee80211_tx_data *tx,
1130 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001131{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001132 struct ieee80211_local *local = sdata->local;
Johannes Berg58d41852007-09-26 17:53:18 +02001133 struct ieee80211_hdr *hdr;
Johannes Berge039fa42008-05-15 12:55:29 +02001134 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg68f2b512011-10-07 14:01:24 +02001135 int tid;
Johannes Berga622ab72010-06-10 10:21:39 +02001136 u8 *qc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001137
1138 memset(tx, 0, sizeof(*tx));
1139 tx->skb = skb;
Johannes Berge2ebc742007-07-27 15:43:22 +02001140 tx->local = local;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001141 tx->sdata = sdata;
Johannes Berg252b86c2011-11-16 15:28:55 +01001142 __skb_queue_head_init(&tx->skbs);
Johannes Berge2ebc742007-07-27 15:43:22 +02001143
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001144 /*
1145 * If this flag is set to true anywhere, and we get here,
1146 * we are doing the needed processing, so remove the flag
1147 * now.
1148 */
1149 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1150
Johannes Berg58d41852007-09-26 17:53:18 +02001151 hdr = (struct ieee80211_hdr *) skb->data;
1152
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001153 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001154 tx->sta = rcu_dereference(sdata->u.vlan.sta);
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001155 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1156 return TX_DROP;
Felix Fietkau66f2c992012-04-29 15:44:16 +02001157 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1158 tx->sdata->control_port_protocol == tx->skb->protocol) {
Felix Fietkaub4d57ad2010-01-31 23:25:24 +01001159 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001160 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001161 if (!tx->sta)
Johannes Bergabe60632009-11-25 17:46:18 +01001162 tx->sta = sta_info_get(sdata, hdr->addr1);
Johannes Berg58d41852007-09-26 17:53:18 +02001163
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001164 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
Johannes Berg49a59542011-09-29 16:04:41 +02001165 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
Arik Nemtsovedf6b782011-08-30 09:32:38 +03001166 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1167 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001168 struct tid_ampdu_tx *tid_tx;
1169
Sujith8b30b1f2008-10-24 09:55:27 +05301170 qc = ieee80211_get_qos_ctl(hdr);
1171 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1172
Johannes Berga622ab72010-06-10 10:21:39 +02001173 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1174 if (tid_tx) {
1175 bool queued;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001176
Johannes Berga622ab72010-06-10 10:21:39 +02001177 queued = ieee80211_tx_prep_agg(tx, skb, info,
1178 tid_tx, tid);
1179
1180 if (unlikely(queued))
1181 return TX_QUEUED;
1182 }
Sujith8b30b1f2008-10-24 09:55:27 +05301183 }
1184
Jiri Slabybadffb72007-08-28 17:01:54 -04001185 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001186 tx->flags &= ~IEEE80211_TX_UNICAST;
Johannes Berge039fa42008-05-15 12:55:29 +02001187 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Simon Wunderlich6fd67e92011-11-18 14:20:42 +01001188 } else
Johannes Berg5cf121c2008-02-25 16:27:43 +01001189 tx->flags |= IEEE80211_TX_UNICAST;
Johannes Berg58d41852007-09-26 17:53:18 +02001190
Johannes Berga26eb272011-10-07 14:01:25 +02001191 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1192 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1193 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1194 info->flags & IEEE80211_TX_CTL_AMPDU)
1195 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
Johannes Berg58d41852007-09-26 17:53:18 +02001196 }
1197
Johannes Berge2ebc742007-07-27 15:43:22 +02001198 if (!tx->sta)
Johannes Berge039fa42008-05-15 12:55:29 +02001199 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001200 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
Johannes Berge039fa42008-05-15 12:55:29 +02001201 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Berg58d41852007-09-26 17:53:18 +02001202
Johannes Berge039fa42008-05-15 12:55:29 +02001203 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge2ebc742007-07-27 15:43:22 +02001204
Johannes Berg9ae54c82008-01-31 19:48:20 +01001205 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +02001206}
1207
Johannes Berg11127e92011-11-16 16:02:47 +01001208static bool ieee80211_tx_frags(struct ieee80211_local *local,
1209 struct ieee80211_vif *vif,
1210 struct ieee80211_sta *sta,
1211 struct sk_buff_head *skbs,
1212 bool txpending)
Johannes Berge2ebc742007-07-27 15:43:22 +02001213{
Thomas Huehn36323f82012-07-23 21:33:42 +02001214 struct ieee80211_tx_control control;
Johannes Berg252b86c2011-11-16 15:28:55 +01001215 struct sk_buff *skb, *tmp;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001216 unsigned long flags;
Johannes Berge2ebc742007-07-27 15:43:22 +02001217
Johannes Berg252b86c2011-11-16 15:28:55 +01001218 skb_queue_walk_safe(skbs, skb, tmp) {
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1220 int q = info->hw_queue;
1221
1222#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1223 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1224 __skb_unlink(skb, skbs);
Felix Fietkauc3e77242012-10-08 14:39:33 +02001225 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001226 continue;
1227 }
1228#endif
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001229
1230 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001231 if (local->queue_stop_reasons[q] ||
Johannes Berg7bb45682011-02-24 14:42:06 +01001232 (!txpending && !skb_queue_empty(&local->pending[q]))) {
Seth Forshee6c17b772013-02-11 11:21:07 -06001233 if (unlikely(info->flags &
Seth Forsheea7679ed2013-02-25 14:58:05 -06001234 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1235 if (local->queue_stop_reasons[q] &
1236 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1237 /*
1238 * Drop off-channel frames if queues
1239 * are stopped for any reason other
1240 * than off-channel operation. Never
1241 * queue them.
1242 */
1243 spin_unlock_irqrestore(
1244 &local->queue_stop_reason_lock,
1245 flags);
1246 ieee80211_purge_tx_queue(&local->hw,
1247 skbs);
1248 return true;
1249 }
1250 } else {
1251
Seth Forshee6c17b772013-02-11 11:21:07 -06001252 /*
Seth Forsheea7679ed2013-02-25 14:58:05 -06001253 * Since queue is stopped, queue up frames for
1254 * later transmission from the tx-pending
1255 * tasklet when the queue is woken again.
Seth Forshee6c17b772013-02-11 11:21:07 -06001256 */
Seth Forsheea7679ed2013-02-25 14:58:05 -06001257 if (txpending)
1258 skb_queue_splice_init(skbs,
1259 &local->pending[q]);
1260 else
1261 skb_queue_splice_tail_init(skbs,
1262 &local->pending[q]);
1263
1264 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1265 flags);
1266 return false;
Seth Forshee6c17b772013-02-11 11:21:07 -06001267 }
Johannes Berg7bb45682011-02-24 14:42:06 +01001268 }
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001269 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001270
Johannes Berg11127e92011-11-16 16:02:47 +01001271 info->control.vif = vif;
Thomas Huehn36323f82012-07-23 21:33:42 +02001272 control.sta = sta;
Johannes Bergec25acc2010-07-22 17:11:28 +02001273
Johannes Berg252b86c2011-11-16 15:28:55 +01001274 __skb_unlink(skb, skbs);
Thomas Huehn36323f82012-07-23 21:33:42 +02001275 drv_tx(local, &control, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001276 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001277
Johannes Berg11127e92011-11-16 16:02:47 +01001278 return true;
1279}
1280
1281/*
1282 * Returns false if the frame couldn't be transmitted but was queued instead.
1283 */
1284static bool __ieee80211_tx(struct ieee80211_local *local,
1285 struct sk_buff_head *skbs, int led_len,
1286 struct sta_info *sta, bool txpending)
1287{
1288 struct ieee80211_tx_info *info;
1289 struct ieee80211_sub_if_data *sdata;
1290 struct ieee80211_vif *vif;
1291 struct ieee80211_sta *pubsta;
1292 struct sk_buff *skb;
1293 bool result = true;
1294 __le16 fc;
1295
1296 if (WARN_ON(skb_queue_empty(skbs)))
1297 return true;
1298
1299 skb = skb_peek(skbs);
1300 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1301 info = IEEE80211_SKB_CB(skb);
1302 sdata = vif_to_sdata(info->control.vif);
1303 if (sta && !sta->uploaded)
1304 sta = NULL;
1305
1306 if (sta)
1307 pubsta = &sta->sta;
1308 else
1309 pubsta = NULL;
1310
1311 switch (sdata->vif.type) {
1312 case NL80211_IFTYPE_MONITOR:
Johannes Berg4b6f1dd2012-04-03 14:35:57 +02001313 sdata = rcu_dereference(local->monitor_sdata);
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001314 if (sdata) {
Johannes Berg4b6f1dd2012-04-03 14:35:57 +02001315 vif = &sdata->vif;
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001316 info->hw_queue =
1317 vif->hw_queue[skb_get_queue_mapping(skb)];
1318 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1319 dev_kfree_skb(skb);
1320 return true;
1321 } else
Johannes Berg4b6f1dd2012-04-03 14:35:57 +02001322 vif = NULL;
Johannes Berg11127e92011-11-16 16:02:47 +01001323 break;
1324 case NL80211_IFTYPE_AP_VLAN:
1325 sdata = container_of(sdata->bss,
1326 struct ieee80211_sub_if_data, u.ap);
1327 /* fall through */
1328 default:
1329 vif = &sdata->vif;
1330 break;
1331 }
1332
Johannes Bergcb831b52012-07-02 15:40:18 +02001333 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1334 txpending);
Johannes Berg11127e92011-11-16 16:02:47 +01001335
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001336 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1337 ieee80211_led_tx(local, 1);
1338
Johannes Berg4db4e0a2011-11-24 14:47:36 +01001339 WARN_ON_ONCE(!skb_queue_empty(skbs));
Johannes Berg252b86c2011-11-16 15:28:55 +01001340
Johannes Berg11127e92011-11-16 16:02:47 +01001341 return result;
Johannes Berge2ebc742007-07-27 15:43:22 +02001342}
1343
Johannes Berg97b045d2008-06-20 01:22:30 +02001344/*
1345 * Invoke TX handlers, return 0 on success and non-zero if the
1346 * frame was dropped or queued.
1347 */
1348static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1349{
Johannes Berg252b86c2011-11-16 15:28:55 +01001350 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berg97b045d2008-06-20 01:22:30 +02001351 ieee80211_tx_result res = TX_DROP;
Johannes Berg97b045d2008-06-20 01:22:30 +02001352
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001353#define CALL_TXH(txh) \
1354 do { \
1355 res = txh(tx); \
1356 if (res != TX_CONTINUE) \
1357 goto txh_done; \
1358 } while (0)
Johannes Berg97b045d2008-06-20 01:22:30 +02001359
Kalle Valo5c1b98a2010-01-12 10:42:46 +02001360 CALL_TXH(ieee80211_tx_h_dynamic_ps);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001361 CALL_TXH(ieee80211_tx_h_check_assoc);
1362 CALL_TXH(ieee80211_tx_h_ps_buf);
Johannes Berga621fa42010-08-27 14:26:54 +03001363 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001364 CALL_TXH(ieee80211_tx_h_select_key);
Johannes Bergaf65cd962009-11-17 18:18:36 +01001365 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1366 CALL_TXH(ieee80211_tx_h_rate_ctrl);
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001367
Johannes Bergaa5b5492011-12-02 22:08:52 +01001368 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1369 __skb_queue_tail(&tx->skbs, tx->skb);
1370 tx->skb = NULL;
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001371 goto txh_done;
Johannes Bergaa5b5492011-12-02 22:08:52 +01001372 }
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001373
1374 CALL_TXH(ieee80211_tx_h_michael_mic_add);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001375 CALL_TXH(ieee80211_tx_h_sequence);
1376 CALL_TXH(ieee80211_tx_h_fragment);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001377 /* handlers after fragment must be aware of tx info fragmentation! */
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001378 CALL_TXH(ieee80211_tx_h_stats);
1379 CALL_TXH(ieee80211_tx_h_encrypt);
Arik Nemtsov8fd369e2011-01-31 22:29:12 +02001380 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1381 CALL_TXH(ieee80211_tx_h_calculate_duration);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001382#undef CALL_TXH
1383
1384 txh_done:
Johannes Berg97b045d2008-06-20 01:22:30 +02001385 if (unlikely(res == TX_DROP)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001386 I802_DEBUG_INC(tx->local->tx_handlers_drop);
Johannes Berg252b86c2011-11-16 15:28:55 +01001387 if (tx->skb)
Felix Fietkauc3e77242012-10-08 14:39:33 +02001388 ieee80211_free_txskb(&tx->local->hw, tx->skb);
Johannes Berg252b86c2011-11-16 15:28:55 +01001389 else
Felix Fietkau1f98ab72012-11-10 03:44:14 +01001390 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
Johannes Berg97b045d2008-06-20 01:22:30 +02001391 return -1;
1392 } else if (unlikely(res == TX_QUEUED)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001393 I802_DEBUG_INC(tx->local->tx_handlers_queued);
Johannes Berg97b045d2008-06-20 01:22:30 +02001394 return -1;
1395 }
1396
1397 return 0;
1398}
1399
Johannes Berg7bb45682011-02-24 14:42:06 +01001400/*
1401 * Returns false if the frame couldn't be transmitted but was queued instead.
1402 */
1403static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
Johannes Berg55de9082012-07-26 17:24:39 +02001404 struct sk_buff *skb, bool txpending,
1405 enum ieee80211_band band)
Johannes Berge2ebc742007-07-27 15:43:22 +02001406{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001407 struct ieee80211_local *local = sdata->local;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001408 struct ieee80211_tx_data tx;
Johannes Berg97b045d2008-06-20 01:22:30 +02001409 ieee80211_tx_result res_prepare;
Johannes Berge039fa42008-05-15 12:55:29 +02001410 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg7bb45682011-02-24 14:42:06 +01001411 bool result = true;
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001412 int led_len;
Johannes Berge2ebc742007-07-27 15:43:22 +02001413
Johannes Berge2ebc742007-07-27 15:43:22 +02001414 if (unlikely(skb->len < 10)) {
1415 dev_kfree_skb(skb);
Johannes Berg7bb45682011-02-24 14:42:06 +01001416 return true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001417 }
1418
Johannes Berg58d41852007-09-26 17:53:18 +02001419 /* initialises tx */
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001420 led_len = skb->len;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001421 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001422
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001423 if (unlikely(res_prepare == TX_DROP)) {
Felix Fietkauc3e77242012-10-08 14:39:33 +02001424 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg55de9082012-07-26 17:24:39 +02001425 return true;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001426 } else if (unlikely(res_prepare == TX_QUEUED)) {
Johannes Berg55de9082012-07-26 17:24:39 +02001427 return true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001428 }
1429
Johannes Berg55de9082012-07-26 17:24:39 +02001430 info->band = band;
Johannes Berge2ebc742007-07-27 15:43:22 +02001431
Johannes Berg3a25a8c2012-04-03 16:28:50 +02001432 /* set up hw_queue value early */
1433 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1434 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1435 info->hw_queue =
1436 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1437
Johannes Berg7bb45682011-02-24 14:42:06 +01001438 if (!invoke_tx_handlers(&tx))
Johannes Berg74e4dbf2011-11-16 15:28:57 +01001439 result = __ieee80211_tx(local, &tx.skbs, led_len,
1440 tx.sta, txpending);
Johannes Berg55de9082012-07-26 17:24:39 +02001441
Johannes Berg7bb45682011-02-24 14:42:06 +01001442 return result;
Johannes Berge2ebc742007-07-27 15:43:22 +02001443}
1444
1445/* device xmit handlers */
1446
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +05301447static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
Johannes Berg23c07522008-05-29 10:38:53 +02001448 struct sk_buff *skb,
1449 int head_need, bool may_encrypt)
1450{
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +05301451 struct ieee80211_local *local = sdata->local;
Johannes Berg23c07522008-05-29 10:38:53 +02001452 int tail_need = 0;
1453
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +05301454 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
Johannes Berg23c07522008-05-29 10:38:53 +02001455 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1456 tail_need -= skb_tailroom(skb);
1457 tail_need = max_t(int, tail_need, 0);
1458 }
1459
Felix Fietkaufc7c9762011-02-07 12:05:00 +01001460 if (skb_cloned(skb))
Johannes Berg23c07522008-05-29 10:38:53 +02001461 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
Felix Fietkau4cd06a32010-12-18 19:30:49 +01001462 else if (head_need || tail_need)
Johannes Berg23c07522008-05-29 10:38:53 +02001463 I802_DEBUG_INC(local->tx_expand_skb_head);
Felix Fietkau4cd06a32010-12-18 19:30:49 +01001464 else
1465 return 0;
Johannes Berg23c07522008-05-29 10:38:53 +02001466
1467 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
Joe Perches0fb9a9e2010-08-20 16:25:38 -07001468 wiphy_debug(local->hw.wiphy,
1469 "failed to reallocate TX buffer\n");
Johannes Berg23c07522008-05-29 10:38:53 +02001470 return -ENOMEM;
1471 }
1472
Johannes Berg23c07522008-05-29 10:38:53 +02001473 return 0;
1474}
1475
Johannes Berg55de9082012-07-26 17:24:39 +02001476void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1477 enum ieee80211_band band)
Johannes Berge2ebc742007-07-27 15:43:22 +02001478{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001479 struct ieee80211_local *local = sdata->local;
Johannes Berge039fa42008-05-15 12:55:29 +02001480 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001481 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berge2ebc742007-07-27 15:43:22 +02001482 int headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001483 bool may_encrypt;
Johannes Berge2ebc742007-07-27 15:43:22 +02001484
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001485 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
Johannes Berg23c07522008-05-29 10:38:53 +02001486
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001487 headroom = local->tx_headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001488 if (may_encrypt)
1489 headroom += IEEE80211_ENCRYPT_HEADROOM;
1490 headroom -= skb_headroom(skb);
1491 headroom = max_t(int, 0, headroom);
1492
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +05301493 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
Felix Fietkauc3e77242012-10-08 14:39:33 +02001494 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001495 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001496 }
1497
Steve deRosier740c1aa2010-09-11 20:01:31 -07001498 hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001499 info->control.vif = &sdata->vif;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001500
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001501 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1502 if (ieee80211_is_data(hdr->frame_control) &&
1503 is_unicast_ether_addr(hdr->addr1)) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01001504 if (mesh_nexthop_resolve(sdata, skb))
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001505 return; /* skb queued: don't free */
1506 } else {
1507 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1508 }
Johannes Berg98aed9f2012-03-27 14:18:36 +02001509 }
Javier Cardonacca89492009-08-10 17:29:29 -07001510
Javier Cardona2154c812011-09-07 17:49:53 -07001511 ieee80211_set_qos_hdr(sdata, skb);
Johannes Berg55de9082012-07-26 17:24:39 +02001512 ieee80211_tx(sdata, skb, false, band);
Johannes Berge2ebc742007-07-27 15:43:22 +02001513}
1514
Johannes Berg73b9f032011-10-07 14:01:26 +02001515static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1516{
1517 struct ieee80211_radiotap_iterator iterator;
1518 struct ieee80211_radiotap_header *rthdr =
1519 (struct ieee80211_radiotap_header *) skb->data;
1520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1521 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1522 NULL);
1523 u16 txflags;
1524
1525 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1526 IEEE80211_TX_CTL_DONTFRAG;
1527
1528 /*
1529 * for every radiotap entry that is present
1530 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1531 * entries present, or -EINVAL on error)
1532 */
1533
1534 while (!ret) {
1535 ret = ieee80211_radiotap_iterator_next(&iterator);
1536
1537 if (ret)
1538 continue;
1539
1540 /* see if this argument is something we can use */
1541 switch (iterator.this_arg_index) {
1542 /*
1543 * You must take care when dereferencing iterator.this_arg
1544 * for multibyte types... the pointer is not aligned. Use
1545 * get_unaligned((type *)iterator.this_arg) to dereference
1546 * iterator.this_arg for type "type" safely on all arches.
1547 */
1548 case IEEE80211_RADIOTAP_FLAGS:
1549 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1550 /*
1551 * this indicates that the skb we have been
1552 * handed has the 32-bit FCS CRC at the end...
1553 * we should react to that by snipping it off
1554 * because it will be recomputed and added
1555 * on transmission
1556 */
1557 if (skb->len < (iterator._max_length + FCS_LEN))
1558 return false;
1559
1560 skb_trim(skb, skb->len - FCS_LEN);
1561 }
1562 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1563 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1564 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1565 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1566 break;
1567
1568 case IEEE80211_RADIOTAP_TX_FLAGS:
1569 txflags = get_unaligned_le16(iterator.this_arg);
1570 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1571 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1572 break;
1573
1574 /*
1575 * Please update the file
1576 * Documentation/networking/mac80211-injection.txt
1577 * when parsing new fields here.
1578 */
1579
1580 default:
1581 break;
1582 }
1583 }
1584
1585 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1586 return false;
1587
1588 /*
1589 * remove the radiotap header
1590 * iterator->_max_length was sanity-checked against
1591 * skb->len by iterator init
1592 */
1593 skb_pull(skb, iterator._max_length);
1594
1595 return true;
1596}
1597
Stephen Hemmingerd0cf9c02009-08-31 19:50:57 +00001598netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1599 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02001600{
1601 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
Johannes Berg55de9082012-07-26 17:24:39 +02001602 struct ieee80211_chanctx_conf *chanctx_conf;
1603 struct ieee80211_channel *chan;
Johannes Berge2ebc742007-07-27 15:43:22 +02001604 struct ieee80211_radiotap_header *prthdr =
1605 (struct ieee80211_radiotap_header *)skb->data;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Helmut Schaaf75f5c62011-08-01 11:32:52 +02001607 struct ieee80211_hdr *hdr;
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001608 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
Andy Green9b8a74e2007-07-27 15:43:24 +02001609 u16 len_rthdr;
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001610 int hdrlen;
Johannes Berge2ebc742007-07-27 15:43:22 +02001611
Andy Green9b8a74e2007-07-27 15:43:24 +02001612 /* check for not even having the fixed radiotap header part */
1613 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1614 goto fail; /* too short to be possibly valid */
1615
1616 /* is it a header version we can trust to find length from? */
1617 if (unlikely(prthdr->it_version))
1618 goto fail; /* only version 0 is supported */
1619
1620 /* then there must be a radiotap header with a length we can use */
1621 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1622
1623 /* does the skb contain enough to deliver on the alleged length? */
1624 if (unlikely(skb->len < len_rthdr))
1625 goto fail; /* skb too short for claimed rt header extent */
Johannes Berge2ebc742007-07-27 15:43:22 +02001626
Johannes Berge2ebc742007-07-27 15:43:22 +02001627 /*
1628 * fix up the pointers accounting for the radiotap
1629 * header still being in there. We are being given
1630 * a precooked IEEE80211 header so no need for
1631 * normal processing
1632 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001633 skb_set_mac_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001634 /*
Andy Green9b8a74e2007-07-27 15:43:24 +02001635 * these are just fixed to the end of the rt area since we
1636 * don't have any better information and at this point, nobody cares
Johannes Berge2ebc742007-07-27 15:43:22 +02001637 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001638 skb_set_network_header(skb, len_rthdr);
1639 skb_set_transport_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001640
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001641 if (skb->len < len_rthdr + 2)
1642 goto fail;
1643
1644 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1645 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1646
1647 if (skb->len < len_rthdr + hdrlen)
1648 goto fail;
1649
Helmut Schaaf75f5c62011-08-01 11:32:52 +02001650 /*
1651 * Initialize skb->protocol if the injected frame is a data frame
1652 * carrying a rfc1042 header
1653 */
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001654 if (ieee80211_is_data(hdr->frame_control) &&
1655 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1656 u8 *payload = (u8 *)hdr + hdrlen;
1657
Joe Perchesb203ca32012-05-08 18:56:52 +00001658 if (ether_addr_equal(payload, rfc1042_header))
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001659 skb->protocol = cpu_to_be16((payload[6] << 8) |
1660 payload[7]);
Helmut Schaaf75f5c62011-08-01 11:32:52 +02001661 }
1662
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001663 memset(info, 0, sizeof(*info));
1664
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001665 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
Johannes Berg73b9f032011-10-07 14:01:26 +02001666 IEEE80211_TX_CTL_INJECTED;
1667
1668 /* process and remove the injection radiotap header */
1669 if (!ieee80211_parse_tx_radiotap(skb))
1670 goto fail;
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001671
1672 rcu_read_lock();
1673
1674 /*
1675 * We process outgoing injected frames that have a local address
1676 * we handle as though they are non-injected frames.
1677 * This code here isn't entirely correct, the local MAC address
1678 * isn't always enough to find the interface to use; for proper
1679 * VLAN/WDS support we will need a different mechanism (which
1680 * likely isn't going to be monitor interfaces).
1681 */
1682 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1683
1684 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1685 if (!ieee80211_sdata_running(tmp_sdata))
1686 continue;
1687 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1688 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1689 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1690 continue;
Joe Perchesb203ca32012-05-08 18:56:52 +00001691 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001692 sdata = tmp_sdata;
1693 break;
1694 }
1695 }
Johannes Berg7351c6b2009-11-19 01:08:30 +01001696
Johannes Berg55de9082012-07-26 17:24:39 +02001697 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1698 if (!chanctx_conf) {
1699 tmp_sdata = rcu_dereference(local->monitor_sdata);
1700 if (tmp_sdata)
1701 chanctx_conf =
1702 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1703 }
Johannes Berg55de9082012-07-26 17:24:39 +02001704
Felix Fietkaub4a7ff72013-01-13 23:10:26 +01001705 if (chanctx_conf)
1706 chan = chanctx_conf->def.chan;
1707 else if (!local->use_chanctx)
1708 chan = local->_oper_channel;
1709 else
1710 goto fail_rcu;
Johannes Berg55de9082012-07-26 17:24:39 +02001711
1712 /*
1713 * Frame injection is not allowed if beaconing is not allowed
1714 * or if we need radar detection. Beaconing is usually not allowed when
1715 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1716 * Passive scan is also used in world regulatory domains where
1717 * your country is not known and as such it should be treated as
1718 * NO TX unless the channel is explicitly allowed in which case
1719 * your current regulatory domain would not have the passive scan
1720 * flag.
1721 *
1722 * Since AP mode uses monitor interfaces to inject/TX management
1723 * frames we can make AP mode the exception to this rule once it
1724 * supports radar detection as its implementation can deal with
1725 * radar detection by itself. We can do that later by adding a
1726 * monitor flag interfaces used for AP support.
1727 */
1728 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1729 IEEE80211_CHAN_PASSIVE_SCAN)))
1730 goto fail_rcu;
1731
1732 ieee80211_xmit(sdata, skb, chan->band);
Johannes Berg5d9cf4a2011-10-07 14:01:23 +02001733 rcu_read_unlock();
1734
Johannes Berge2ebc742007-07-27 15:43:22 +02001735 return NETDEV_TX_OK;
Andy Green9b8a74e2007-07-27 15:43:24 +02001736
Johannes Berg55de9082012-07-26 17:24:39 +02001737fail_rcu:
1738 rcu_read_unlock();
Andy Green9b8a74e2007-07-27 15:43:24 +02001739fail:
1740 dev_kfree_skb(skb);
1741 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
Johannes Berge2ebc742007-07-27 15:43:22 +02001742}
1743
1744/**
1745 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1746 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1747 * @skb: packet to be sent
1748 * @dev: incoming interface
1749 *
1750 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1751 * not be freed, and caller is responsible for either retrying later or freeing
1752 * skb).
1753 *
1754 * This function takes in an Ethernet header and encapsulates it with suitable
1755 * IEEE 802.11 header based on which interface the packet is coming in. The
1756 * encapsulated packet will then be passed to master interface, wlan#.11, for
1757 * transmission (through low-level driver).
1758 */
Stephen Hemmingerd0cf9c02009-08-31 19:50:57 +00001759netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1760 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02001761{
Johannes Berg133b8222008-09-16 14:18:59 +02001762 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1763 struct ieee80211_local *local = sdata->local;
Felix Fietkau489ee912010-12-18 19:30:48 +01001764 struct ieee80211_tx_info *info;
Johannes Bergdcf33962012-07-30 15:11:56 +02001765 int head_need;
Harvey Harrison065e96052008-06-22 16:45:27 -07001766 u16 ethertype, hdrlen, meshhdrlen = 0;
1767 __le16 fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001768 struct ieee80211_hdr hdr;
Wey-Yi Guyff67bb82010-08-21 07:23:29 -07001769 struct ieee80211s_hdr mesh_hdr __maybe_unused;
Chun-Yeow Yeohb8bacc12012-05-30 09:30:41 +08001770 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +02001771 const u8 *encaps_data;
1772 int encaps_len, skip_header_bytes;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001773 int nh_pos, h_pos;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001774 struct sta_info *sta = NULL;
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001775 bool wme_sta = false, authorized = false, tdls_auth = false;
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001776 bool tdls_direct = false;
Johannes Berga729cff2011-11-06 14:13:34 +01001777 bool multicast;
1778 u32 info_flags = 0;
1779 u16 info_id = 0;
Johannes Berg55de9082012-07-26 17:24:39 +02001780 struct ieee80211_chanctx_conf *chanctx_conf;
1781 struct ieee80211_sub_if_data *ap_sdata;
1782 enum ieee80211_band band;
Johannes Berge2ebc742007-07-27 15:43:22 +02001783
Johannes Bergdcf33962012-07-30 15:11:56 +02001784 if (unlikely(skb->len < ETH_HLEN))
Johannes Berge2ebc742007-07-27 15:43:22 +02001785 goto fail;
Johannes Berge2ebc742007-07-27 15:43:22 +02001786
Johannes Berge2ebc742007-07-27 15:43:22 +02001787 /* convert Ethernet header to proper 802.11 header (based on
1788 * operation mode) */
1789 ethertype = (skb->data[12] << 8) | skb->data[13];
Harvey Harrison065e96052008-06-22 16:45:27 -07001790 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
Johannes Berge2ebc742007-07-27 15:43:22 +02001791
Johannes Berg55de9082012-07-26 17:24:39 +02001792 rcu_read_lock();
1793
Johannes Berg51fb61e2007-12-19 01:31:27 +01001794 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02001795 case NL80211_IFTYPE_AP_VLAN:
Johannes Berg9bc383d2009-11-19 11:55:19 +01001796 sta = rcu_dereference(sdata->u.vlan.sta);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001797 if (sta) {
1798 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1799 /* RA TA DA SA */
1800 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001801 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001802 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1803 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1804 hdrlen = 30;
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001805 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1806 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001807 }
Johannes Berg55de9082012-07-26 17:24:39 +02001808 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1809 u.ap);
1810 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1811 if (!chanctx_conf)
1812 goto fail_rcu;
Johannes Berg4bf88532012-11-09 11:39:59 +01001813 band = chanctx_conf->def.chan->band;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001814 if (sta)
1815 break;
1816 /* fall through */
1817 case NL80211_IFTYPE_AP:
Arnd Bergmannfe801232013-01-25 14:14:33 +00001818 if (sdata->vif.type == NL80211_IFTYPE_AP)
1819 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1820 if (!chanctx_conf)
1821 goto fail_rcu;
Harvey Harrison065e96052008-06-22 16:45:27 -07001822 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001823 /* DA BSSID SA */
1824 memcpy(hdr.addr1, skb->data, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001825 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001826 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1827 hdrlen = 24;
Johannes Berg4bf88532012-11-09 11:39:59 +01001828 band = chanctx_conf->def.chan->band;
Johannes Bergcf966832007-08-28 17:01:54 -04001829 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001830 case NL80211_IFTYPE_WDS:
Harvey Harrison065e96052008-06-22 16:45:27 -07001831 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001832 /* RA TA DA SA */
1833 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001834 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001835 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1836 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1837 hdrlen = 30;
Johannes Berg55de9082012-07-26 17:24:39 +02001838 /*
1839 * This is the exception! WDS style interfaces are prohibited
1840 * when channel contexts are in used so this must be valid
1841 */
1842 band = local->hw.conf.channel->band;
Johannes Bergcf966832007-08-28 17:01:54 -04001843 break;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001844#ifdef CONFIG_MAC80211_MESH
Johannes Berg05c914f2008-09-11 00:01:58 +02001845 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg472dbc42008-09-11 00:01:49 +02001846 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001847 /* Do not send frames with mesh_ttl == 0 */
Johannes Berg472dbc42008-09-11 00:01:49 +02001848 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Johannes Berg55de9082012-07-26 17:24:39 +02001849 goto fail_rcu;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001850 }
Johannes Berg55de9082012-07-26 17:24:39 +02001851
Chun-Yeow Yeohb8bacc12012-05-30 09:30:41 +08001852 if (!is_multicast_ether_addr(skb->data)) {
Chun-Yeow Yeoh163df6c2013-02-19 10:04:50 +08001853 struct sta_info *next_hop;
1854 bool mpp_lookup = true;
1855
Johannes Bergbf7cd942013-02-15 14:40:31 +01001856 mpath = mesh_path_lookup(sdata, skb->data);
Chun-Yeow Yeoh163df6c2013-02-19 10:04:50 +08001857 if (mpath) {
1858 mpp_lookup = false;
1859 next_hop = rcu_dereference(mpath->next_hop);
1860 if (!next_hop ||
1861 !(mpath->flags & (MESH_PATH_ACTIVE |
1862 MESH_PATH_RESOLVING)))
1863 mpp_lookup = true;
1864 }
1865
1866 if (mpp_lookup)
Johannes Bergbf7cd942013-02-15 14:40:31 +01001867 mppath = mpp_path_lookup(sdata, skb->data);
Chun-Yeow Yeoh163df6c2013-02-19 10:04:50 +08001868
1869 if (mppath && mpath)
1870 mesh_path_del(mpath->sdata, mpath->dst);
Chun-Yeow Yeohb8bacc12012-05-30 09:30:41 +08001871 }
YanBo79617de2008-09-22 13:30:32 +08001872
Joel A Fernandesf76b57b2010-12-28 19:28:11 -06001873 /*
Joel A Fernandes9d525012011-01-10 00:44:23 -06001874 * Use address extension if it is a packet from
1875 * another interface or if we know the destination
1876 * is being proxied by a portal (i.e. portal address
1877 * differs from proxied address)
Joel A Fernandesf76b57b2010-12-28 19:28:11 -06001878 */
Joe Perchesb203ca32012-05-08 18:56:52 +00001879 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1880 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001881 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1882 skb->data, skb->data + ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +01001883 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1884 NULL, NULL);
YanBo79617de2008-09-22 13:30:32 +08001885 } else {
Thomas Pedersen27f01122012-08-20 11:28:25 -07001886 /* DS -> MBSS (802.11-2012 13.11.3.3).
1887 * For unicast with unknown forwarding information,
1888 * destination might be in the MBSS or if that fails
1889 * forwarded to another mesh gate. In either case
1890 * resolution will be handled in ieee80211_xmit(), so
1891 * leave the original DA. This also works for mcast */
1892 const u8 *mesh_da = skb->data;
YanBo79617de2008-09-22 13:30:32 +08001893
Thomas Pedersen27f01122012-08-20 11:28:25 -07001894 if (mppath)
1895 mesh_da = mppath->mpp;
1896 else if (mpath)
1897 mesh_da = mpath->dst;
Thomas Pedersen27f01122012-08-20 11:28:25 -07001898
Javier Cardona3c5772a2009-08-10 12:15:48 -07001899 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
Johannes Berg47846c92009-11-25 17:46:19 +01001900 mesh_da, sdata->vif.addr);
Thomas Pedersen27f01122012-08-20 11:28:25 -07001901 if (is_multicast_ether_addr(mesh_da))
1902 /* DA TA mSA AE:SA */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001903 meshhdrlen = ieee80211_new_mesh_header(
1904 sdata, &mesh_hdr,
1905 skb->data + ETH_ALEN, NULL);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001906 else
Thomas Pedersen27f01122012-08-20 11:28:25 -07001907 /* RA TA mDA mSA AE:DA SA */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001908 meshhdrlen = ieee80211_new_mesh_header(
1909 sdata, &mesh_hdr, skb->data,
1910 skb->data + ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001911
YanBo79617de2008-09-22 13:30:32 +08001912 }
Johannes Berg55de9082012-07-26 17:24:39 +02001913 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1914 if (!chanctx_conf)
1915 goto fail_rcu;
Johannes Berg4bf88532012-11-09 11:39:59 +01001916 band = chanctx_conf->def.chan->band;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001917 break;
1918#endif
Johannes Berg05c914f2008-09-11 00:01:58 +02001919 case NL80211_IFTYPE_STATION:
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001920 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001921 bool tdls_peer = false;
1922
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001923 sta = sta_info_get(sdata, skb->data);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001924 if (sta) {
1925 authorized = test_sta_flag(sta,
1926 WLAN_STA_AUTHORIZED);
1927 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1928 tdls_peer = test_sta_flag(sta,
1929 WLAN_STA_TDLS_PEER);
1930 tdls_auth = test_sta_flag(sta,
1931 WLAN_STA_TDLS_PEER_AUTH);
1932 }
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001933
1934 /*
1935 * If the TDLS link is enabled, send everything
1936 * directly. Otherwise, allow TDLS setup frames
1937 * to be transmitted indirectly.
1938 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001939 tdls_direct = tdls_peer && (tdls_auth ||
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001940 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1941 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1942 }
1943
1944 if (tdls_direct) {
1945 /* link during setup - throw out frames to peer */
Johannes Bergdcf33962012-07-30 15:11:56 +02001946 if (!tdls_auth)
Johannes Berg55de9082012-07-26 17:24:39 +02001947 goto fail_rcu;
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001948
1949 /* DA SA BSSID */
1950 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1951 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1952 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1953 hdrlen = 24;
1954 } else if (sdata->u.mgd.use_4addr &&
1955 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1956 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1957 IEEE80211_FCTL_TODS);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001958 /* RA TA DA SA */
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001959 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001960 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001961 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1962 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1963 hdrlen = 30;
1964 } else {
1965 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1966 /* BSSID SA DA */
Arik Nemtsov941c93c2011-09-28 14:12:54 +03001967 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001968 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1969 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1970 hdrlen = 24;
1971 }
Johannes Berg55de9082012-07-26 17:24:39 +02001972 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1973 if (!chanctx_conf)
1974 goto fail_rcu;
Johannes Berg4bf88532012-11-09 11:39:59 +01001975 band = chanctx_conf->def.chan->band;
Johannes Bergcf966832007-08-28 17:01:54 -04001976 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001977 case NL80211_IFTYPE_ADHOC:
Johannes Berge2ebc742007-07-27 15:43:22 +02001978 /* DA SA BSSID */
1979 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1980 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001981 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001982 hdrlen = 24;
Johannes Berg55de9082012-07-26 17:24:39 +02001983 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1984 if (!chanctx_conf)
1985 goto fail_rcu;
Johannes Berg4bf88532012-11-09 11:39:59 +01001986 band = chanctx_conf->def.chan->band;
Johannes Bergcf966832007-08-28 17:01:54 -04001987 break;
1988 default:
Johannes Berg55de9082012-07-26 17:24:39 +02001989 goto fail_rcu;
Johannes Berge2ebc742007-07-27 15:43:22 +02001990 }
1991
Johannes Berg7d185b82008-01-28 17:11:43 +01001992 /*
1993 * There's no need to try to look up the destination
1994 * if it is a multicast address (which can only happen
1995 * in AP mode)
1996 */
Johannes Berga729cff2011-11-06 14:13:34 +01001997 multicast = is_multicast_ether_addr(hdr.addr1);
1998 if (!multicast) {
Johannes Bergabe60632009-11-25 17:46:18 +01001999 sta = sta_info_get(sdata, hdr.addr1);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02002000 if (sta) {
2001 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2002 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
2003 }
Johannes Berge2ebc742007-07-27 15:43:22 +02002004 }
2005
Javier Cardona4777be42011-09-07 17:49:52 -07002006 /* For mesh, the use of the QoS header is mandatory */
2007 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Bergc2c98fd2011-09-29 16:04:36 +02002008 wme_sta = true;
Javier Cardona4777be42011-09-07 17:49:52 -07002009
Johannes Berg3434fbd2008-05-03 00:59:37 +02002010 /* receiver and we are QoS enabled, use a QoS type frame */
Johannes Berg32c50572012-03-28 11:04:29 +02002011 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
Harvey Harrison065e96052008-06-22 16:45:27 -07002012 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002013 hdrlen += 2;
2014 }
2015
2016 /*
Johannes Berg238814f2008-01-28 17:19:37 +01002017 * Drop unicast frames to unauthorised stations unless they are
2018 * EAPOL frames from the local station.
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002019 */
Johannes Berg55182e42011-10-12 17:28:21 +02002020 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2021 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
2022 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
Joe Perchesb203ca32012-05-08 18:56:52 +00002023 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002024#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002025 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002026 dev->name, hdr.addr1);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002027#endif
2028
2029 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2030
Johannes Berg55de9082012-07-26 17:24:39 +02002031 goto fail_rcu;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002032 }
2033
Johannes Berga729cff2011-11-06 14:13:34 +01002034 if (unlikely(!multicast && skb->sk &&
2035 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2036 struct sk_buff *orig_skb = skb;
2037
2038 skb = skb_clone(skb, GFP_ATOMIC);
2039 if (skb) {
2040 unsigned long flags;
Tejun Heo9475af62013-02-27 17:04:59 -08002041 int id;
Johannes Berga729cff2011-11-06 14:13:34 +01002042
2043 spin_lock_irqsave(&local->ack_status_lock, flags);
Tejun Heo9475af62013-02-27 17:04:59 -08002044 id = idr_alloc(&local->ack_status_frames, orig_skb,
2045 1, 0x10000, GFP_ATOMIC);
Johannes Berga729cff2011-11-06 14:13:34 +01002046 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2047
Tejun Heo9475af62013-02-27 17:04:59 -08002048 if (id >= 0) {
Johannes Berga729cff2011-11-06 14:13:34 +01002049 info_id = id;
2050 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2051 } else if (skb_shared(skb)) {
2052 kfree_skb(orig_skb);
2053 } else {
2054 kfree_skb(skb);
2055 skb = orig_skb;
2056 }
2057 } else {
2058 /* couldn't clone -- lose tx status ... */
2059 skb = orig_skb;
2060 }
2061 }
2062
Helmut Schaa7e244702010-12-02 18:44:09 +01002063 /*
2064 * If the skb is shared we need to obtain our own copy.
2065 */
2066 if (skb_shared(skb)) {
Johannes Berga729cff2011-11-06 14:13:34 +01002067 struct sk_buff *tmp_skb = skb;
2068
2069 /* can't happen -- skb is a clone if info_id != 0 */
2070 WARN_ON(info_id);
2071
Felix Fietkauf8a0a782010-12-18 19:30:50 +01002072 skb = skb_clone(skb, GFP_ATOMIC);
Helmut Schaa7e244702010-12-02 18:44:09 +01002073 kfree_skb(tmp_skb);
2074
Johannes Bergdcf33962012-07-30 15:11:56 +02002075 if (!skb)
Johannes Berg55de9082012-07-26 17:24:39 +02002076 goto fail_rcu;
Helmut Schaa7e244702010-12-02 18:44:09 +01002077 }
2078
Harvey Harrison065e96052008-06-22 16:45:27 -07002079 hdr.frame_control = fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02002080 hdr.duration_id = 0;
2081 hdr.seq_ctrl = 0;
2082
2083 skip_header_bytes = ETH_HLEN;
2084 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2085 encaps_data = bridge_tunnel_header;
2086 encaps_len = sizeof(bridge_tunnel_header);
2087 skip_header_bytes -= 2;
2088 } else if (ethertype >= 0x600) {
2089 encaps_data = rfc1042_header;
2090 encaps_len = sizeof(rfc1042_header);
2091 skip_header_bytes -= 2;
2092 } else {
2093 encaps_data = NULL;
2094 encaps_len = 0;
2095 }
2096
Helmut Schaa7e244702010-12-02 18:44:09 +01002097 nh_pos = skb_network_header(skb) - skb->data;
2098 h_pos = skb_transport_header(skb) - skb->data;
2099
Johannes Berge2ebc742007-07-27 15:43:22 +02002100 skb_pull(skb, skip_header_bytes);
2101 nh_pos -= skip_header_bytes;
2102 h_pos -= skip_header_bytes;
2103
Johannes Berg23c07522008-05-29 10:38:53 +02002104 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02002105
Johannes Berg23c07522008-05-29 10:38:53 +02002106 /*
2107 * So we need to modify the skb header and hence need a copy of
2108 * that. The head_need variable above doesn't, so far, include
2109 * the needed header space that we don't need right away. If we
2110 * can, then we don't reallocate right now but only after the
2111 * frame arrives at the master device (if it does...)
2112 *
2113 * If we cannot, however, then we will reallocate to include all
2114 * the ever needed space. Also, if we need to reallocate it anyway,
2115 * make it big enough for everything we may ever need.
2116 */
Johannes Berge2ebc742007-07-27 15:43:22 +02002117
David S. Miller3a5be7d2008-06-18 01:19:51 -07002118 if (head_need > 0 || skb_cloned(skb)) {
Johannes Berg23c07522008-05-29 10:38:53 +02002119 head_need += IEEE80211_ENCRYPT_HEADROOM;
2120 head_need += local->tx_headroom;
2121 head_need = max_t(int, 0, head_need);
Felix Fietkauc3e77242012-10-08 14:39:33 +02002122 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2123 ieee80211_free_txskb(&local->hw, skb);
Johannes Berg1c963be2012-11-07 14:02:30 +01002124 skb = NULL;
Johannes Berg55de9082012-07-26 17:24:39 +02002125 goto fail_rcu;
Felix Fietkauc3e77242012-10-08 14:39:33 +02002126 }
Johannes Berge2ebc742007-07-27 15:43:22 +02002127 }
2128
2129 if (encaps_data) {
2130 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2131 nh_pos += encaps_len;
2132 h_pos += encaps_len;
2133 }
Johannes Bergc29b9b92007-09-14 11:10:24 -04002134
Yuri Ershove4ab7eb2010-06-29 15:08:06 +04002135#ifdef CONFIG_MAC80211_MESH
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002136 if (meshhdrlen > 0) {
2137 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2138 nh_pos += meshhdrlen;
2139 h_pos += meshhdrlen;
2140 }
Yuri Ershove4ab7eb2010-06-29 15:08:06 +04002141#endif
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002142
Harvey Harrison065e96052008-06-22 16:45:27 -07002143 if (ieee80211_is_data_qos(fc)) {
Johannes Bergc29b9b92007-09-14 11:10:24 -04002144 __le16 *qos_control;
2145
2146 qos_control = (__le16*) skb_push(skb, 2);
2147 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2148 /*
2149 * Maybe we could actually set some fields here, for now just
2150 * initialise to zero to indicate no special operation.
2151 */
2152 *qos_control = 0;
2153 } else
2154 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2155
Johannes Berge2ebc742007-07-27 15:43:22 +02002156 nh_pos += hdrlen;
2157 h_pos += hdrlen;
2158
Stephen Hemminger68aae112007-08-24 11:29:34 -07002159 dev->stats.tx_packets++;
2160 dev->stats.tx_bytes += skb->len;
Johannes Berge2ebc742007-07-27 15:43:22 +02002161
2162 /* Update skb pointers to various headers since this modified frame
2163 * is going to go through Linux networking code that may potentially
2164 * need things like pointer to IP header. */
2165 skb_set_mac_header(skb, 0);
2166 skb_set_network_header(skb, nh_pos);
2167 skb_set_transport_header(skb, h_pos);
2168
Felix Fietkau489ee912010-12-18 19:30:48 +01002169 info = IEEE80211_SKB_CB(skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002170 memset(info, 0, sizeof(*info));
2171
Johannes Berge2ebc742007-07-27 15:43:22 +02002172 dev->trans_start = jiffies;
Johannes Berga729cff2011-11-06 14:13:34 +01002173
2174 info->flags = info_flags;
2175 info->ack_frame_id = info_id;
2176
Johannes Berg55de9082012-07-26 17:24:39 +02002177 ieee80211_xmit(sdata, skb, band);
2178 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002179
Patrick McHardyec634fe2009-07-05 19:23:38 -07002180 return NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02002181
Johannes Berg55de9082012-07-26 17:24:39 +02002182 fail_rcu:
2183 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002184 fail:
Johannes Bergdcf33962012-07-30 15:11:56 +02002185 dev_kfree_skb(skb);
2186 return NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02002187}
2188
Johannes Berge2ebc742007-07-27 15:43:22 +02002189
Johannes Berge2530082008-05-17 00:57:14 +02002190/*
2191 * ieee80211_clear_tx_pending may not be called in a context where
2192 * it is possible that it packets could come in again.
2193 */
Johannes Berge2ebc742007-07-27 15:43:22 +02002194void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2195{
Felix Fietkau1f98ab72012-11-10 03:44:14 +01002196 struct sk_buff *skb;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01002197 int i;
Johannes Berge2ebc742007-07-27 15:43:22 +02002198
Felix Fietkau1f98ab72012-11-10 03:44:14 +01002199 for (i = 0; i < local->hw.queues; i++) {
2200 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2201 ieee80211_free_txskb(&local->hw, skb);
2202 }
Johannes Berge2ebc742007-07-27 15:43:22 +02002203}
2204
Johannes Berg7bb45682011-02-24 14:42:06 +01002205/*
2206 * Returns false if the frame couldn't be transmitted but was queued instead,
2207 * which in this case means re-queued -- take as an indication to stop sending
2208 * more pending frames.
2209 */
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002210static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2211 struct sk_buff *skb)
2212{
2213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2214 struct ieee80211_sub_if_data *sdata;
2215 struct sta_info *sta;
2216 struct ieee80211_hdr *hdr;
Johannes Berg7bb45682011-02-24 14:42:06 +01002217 bool result;
Johannes Berg55de9082012-07-26 17:24:39 +02002218 struct ieee80211_chanctx_conf *chanctx_conf;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002219
Johannes Berg5061b0c2009-07-14 00:33:34 +02002220 sdata = vif_to_sdata(info->control.vif);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002221
2222 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
Johannes Berg55de9082012-07-26 17:24:39 +02002223 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2224 if (unlikely(!chanctx_conf)) {
2225 dev_kfree_skb(skb);
2226 return true;
2227 }
2228 result = ieee80211_tx(sdata, skb, true,
Johannes Berg4bf88532012-11-09 11:39:59 +01002229 chanctx_conf->def.chan->band);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002230 } else {
Johannes Berg252b86c2011-11-16 15:28:55 +01002231 struct sk_buff_head skbs;
2232
2233 __skb_queue_head_init(&skbs);
2234 __skb_queue_tail(&skbs, skb);
2235
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002236 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergabe60632009-11-25 17:46:18 +01002237 sta = sta_info_get(sdata, hdr->addr1);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002238
Johannes Berg74e4dbf2011-11-16 15:28:57 +01002239 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002240 }
2241
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002242 return result;
2243}
2244
Johannes Berge2530082008-05-17 00:57:14 +02002245/*
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002246 * Transmit all pending packets. Called from tasklet.
Johannes Berge2530082008-05-17 00:57:14 +02002247 */
Johannes Berge2ebc742007-07-27 15:43:22 +02002248void ieee80211_tx_pending(unsigned long data)
2249{
2250 struct ieee80211_local *local = (struct ieee80211_local *)data;
Johannes Berg2a577d92009-03-23 17:28:37 +01002251 unsigned long flags;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002252 int i;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002253 bool txok;
Johannes Berge2ebc742007-07-27 15:43:22 +02002254
Johannes Bergf0e72852009-03-23 17:28:36 +01002255 rcu_read_lock();
Johannes Berg2a577d92009-03-23 17:28:37 +01002256
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002257 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
Johannes Berg176be722009-03-12 23:49:28 +01002258 for (i = 0; i < local->hw.queues; i++) {
Johannes Berg2a577d92009-03-23 17:28:37 +01002259 /*
2260 * If queue is stopped by something other than due to pending
2261 * frames, or we have no pending frames, proceed to next queue.
2262 */
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002263 if (local->queue_stop_reasons[i] ||
Johannes Berg2a577d92009-03-23 17:28:37 +01002264 skb_queue_empty(&local->pending[i]))
Johannes Berge2ebc742007-07-27 15:43:22 +02002265 continue;
Johannes Berge2530082008-05-17 00:57:14 +02002266
Johannes Berg2a577d92009-03-23 17:28:37 +01002267 while (!skb_queue_empty(&local->pending[i])) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002268 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
Johannes Berg5061b0c2009-07-14 00:33:34 +02002269 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg5061b0c2009-07-14 00:33:34 +02002270
Johannes Berga7bc3762009-07-27 10:33:31 +02002271 if (WARN_ON(!info->control.vif)) {
Felix Fietkauc3e77242012-10-08 14:39:33 +02002272 ieee80211_free_txskb(&local->hw, skb);
Johannes Berga7bc3762009-07-27 10:33:31 +02002273 continue;
2274 }
2275
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002276 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2277 flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01002278
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002279 txok = ieee80211_tx_pending_skb(local, skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002280 spin_lock_irqsave(&local->queue_stop_reason_lock,
2281 flags);
2282 if (!txok)
Johannes Berg2a577d92009-03-23 17:28:37 +01002283 break;
Johannes Berge2ebc742007-07-27 15:43:22 +02002284 }
Johannes Berg7236fe22010-03-22 13:42:43 -07002285
2286 if (skb_queue_empty(&local->pending[i]))
Johannes Berg3a25a8c2012-04-03 16:28:50 +02002287 ieee80211_propagate_queue_wake(local, i);
Johannes Berge2ebc742007-07-27 15:43:22 +02002288 }
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002289 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01002290
Johannes Bergf0e72852009-03-23 17:28:36 +01002291 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002292}
2293
2294/* functions for drivers to get certain frames */
2295
Marco Porscheac70c12013-01-07 16:04:50 +01002296static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2297 struct ps_data *ps, struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02002298{
2299 u8 *pos, *tim;
2300 int aid0 = 0;
2301 int i, have_bits = 0, n1, n2;
2302
2303 /* Generate bitmap for TIM only if there are any STAs in power save
2304 * mode. */
Marco Porschd012a602012-10-10 12:39:50 -07002305 if (atomic_read(&ps->num_sta_ps) > 0)
Johannes Berge2ebc742007-07-27 15:43:22 +02002306 /* in the hope that this is faster than
2307 * checking byte-for-byte */
Marco Porschd012a602012-10-10 12:39:50 -07002308 have_bits = !bitmap_empty((unsigned long*)ps->tim,
Johannes Berge2ebc742007-07-27 15:43:22 +02002309 IEEE80211_MAX_AID+1);
2310
Marco Porschd012a602012-10-10 12:39:50 -07002311 if (ps->dtim_count == 0)
2312 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
Johannes Berge2ebc742007-07-27 15:43:22 +02002313 else
Marco Porschd012a602012-10-10 12:39:50 -07002314 ps->dtim_count--;
Johannes Berge2ebc742007-07-27 15:43:22 +02002315
2316 tim = pos = (u8 *) skb_put(skb, 6);
2317 *pos++ = WLAN_EID_TIM;
2318 *pos++ = 4;
Marco Porschd012a602012-10-10 12:39:50 -07002319 *pos++ = ps->dtim_count;
Johannes Berg88600202012-02-13 15:17:18 +01002320 *pos++ = sdata->vif.bss_conf.dtim_period;
Johannes Berge2ebc742007-07-27 15:43:22 +02002321
Marco Porschd012a602012-10-10 12:39:50 -07002322 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
Johannes Berge2ebc742007-07-27 15:43:22 +02002323 aid0 = 1;
2324
Marco Porschd012a602012-10-10 12:39:50 -07002325 ps->dtim_bc_mc = aid0 == 1;
Christian Lamparter512119b2011-01-31 20:48:44 +02002326
Johannes Berge2ebc742007-07-27 15:43:22 +02002327 if (have_bits) {
2328 /* Find largest even number N1 so that bits numbered 1 through
2329 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2330 * (N2 + 1) x 8 through 2007 are 0. */
2331 n1 = 0;
2332 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
Marco Porschd012a602012-10-10 12:39:50 -07002333 if (ps->tim[i]) {
Johannes Berge2ebc742007-07-27 15:43:22 +02002334 n1 = i & 0xfe;
2335 break;
2336 }
2337 }
2338 n2 = n1;
2339 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
Marco Porschd012a602012-10-10 12:39:50 -07002340 if (ps->tim[i]) {
Johannes Berge2ebc742007-07-27 15:43:22 +02002341 n2 = i;
2342 break;
2343 }
2344 }
2345
2346 /* Bitmap control */
2347 *pos++ = n1 | aid0;
2348 /* Part Virt Bitmap */
Eliad Peller5220da32011-11-24 16:50:00 +02002349 skb_put(skb, n2 - n1);
Marco Porschd012a602012-10-10 12:39:50 -07002350 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
Johannes Berge2ebc742007-07-27 15:43:22 +02002351
2352 tim[1] = n2 - n1 + 4;
Johannes Berge2ebc742007-07-27 15:43:22 +02002353 } else {
2354 *pos++ = aid0; /* Bitmap control */
2355 *pos++ = 0; /* Part Virt Bitmap */
2356 }
Johannes Berge2ebc742007-07-27 15:43:22 +02002357}
2358
Marco Porscheac70c12013-01-07 16:04:50 +01002359static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2360 struct ps_data *ps, struct sk_buff *skb)
2361{
2362 struct ieee80211_local *local = sdata->local;
2363
2364 /*
2365 * Not very nice, but we want to allow the driver to call
2366 * ieee80211_beacon_get() as a response to the set_tim()
2367 * callback. That, however, is already invoked under the
2368 * sta_lock to guarantee consistent and race-free update
2369 * of the tim bitmap in mac80211 and the driver.
2370 */
2371 if (local->tim_in_locked_section) {
2372 __ieee80211_beacon_add_tim(sdata, ps, skb);
2373 } else {
Johannes Berg1b917312013-02-22 12:55:01 +01002374 spin_lock_bh(&local->tim_lock);
Marco Porscheac70c12013-01-07 16:04:50 +01002375 __ieee80211_beacon_add_tim(sdata, ps, skb);
Johannes Berg1b917312013-02-22 12:55:01 +01002376 spin_unlock_bh(&local->tim_lock);
Marco Porscheac70c12013-01-07 16:04:50 +01002377 }
2378
2379 return 0;
2380}
2381
Johannes Bergeddcbb92009-10-29 08:30:35 +01002382struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2383 struct ieee80211_vif *vif,
2384 u16 *tim_offset, u16 *tim_length)
Johannes Berge2ebc742007-07-27 15:43:22 +02002385{
2386 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg9d139c82008-07-09 14:40:37 +02002387 struct sk_buff *skb = NULL;
Johannes Berge039fa42008-05-15 12:55:29 +02002388 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02002389 struct ieee80211_sub_if_data *sdata = NULL;
Johannes Berg55de9082012-07-26 17:24:39 +02002390 enum ieee80211_band band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002391 struct ieee80211_tx_rate_control txrc;
Johannes Berg55de9082012-07-26 17:24:39 +02002392 struct ieee80211_chanctx_conf *chanctx_conf;
Johannes Berg8318d782008-01-24 19:38:38 +01002393
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002394 rcu_read_lock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002395
Johannes Berg32bfd352007-12-19 01:31:26 +01002396 sdata = vif_to_sdata(vif);
Johannes Berg55de9082012-07-26 17:24:39 +02002397 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berge2ebc742007-07-27 15:43:22 +02002398
Johannes Berg55de9082012-07-26 17:24:39 +02002399 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
Felix Fietkaueb3e5542011-01-24 19:28:49 +01002400 goto out;
2401
Johannes Bergeddcbb92009-10-29 08:30:35 +01002402 if (tim_offset)
2403 *tim_offset = 0;
2404 if (tim_length)
2405 *tim_length = 0;
2406
Johannes Berg05c914f2008-09-11 00:01:58 +02002407 if (sdata->vif.type == NL80211_IFTYPE_AP) {
Marco Porschd012a602012-10-10 12:39:50 -07002408 struct ieee80211_if_ap *ap = &sdata->u.ap;
2409 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2410
Dan Carpenter3ad97fb2011-02-07 22:03:35 +03002411 if (beacon) {
Johannes Berg902acc72008-02-23 15:17:19 +01002412 /*
2413 * headroom, head length,
2414 * tail length and maximum TIM length
2415 */
2416 skb = dev_alloc_skb(local->tx_headroom +
2417 beacon->head_len +
2418 beacon->tail_len + 256);
2419 if (!skb)
2420 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002421
Johannes Berg902acc72008-02-23 15:17:19 +01002422 skb_reserve(skb, local->tx_headroom);
2423 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2424 beacon->head_len);
2425
Marco Porscheac70c12013-01-07 16:04:50 +01002426 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
Johannes Berg902acc72008-02-23 15:17:19 +01002427
Johannes Bergeddcbb92009-10-29 08:30:35 +01002428 if (tim_offset)
2429 *tim_offset = beacon->head_len;
2430 if (tim_length)
2431 *tim_length = skb->len - beacon->head_len;
2432
Johannes Berg902acc72008-02-23 15:17:19 +01002433 if (beacon->tail)
2434 memcpy(skb_put(skb, beacon->tail_len),
2435 beacon->tail, beacon->tail_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02002436 } else
2437 goto out;
Johannes Berg05c914f2008-09-11 00:01:58 +02002438 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Johannes Berg46900292009-02-15 12:44:28 +01002439 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg9d139c82008-07-09 14:40:37 +02002440 struct ieee80211_hdr *hdr;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002441 struct sk_buff *presp = rcu_dereference(ifibss->presp);
Johannes Berg902acc72008-02-23 15:17:19 +01002442
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002443 if (!presp)
Johannes Berg9d139c82008-07-09 14:40:37 +02002444 goto out;
2445
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002446 skb = skb_copy(presp, GFP_ATOMIC);
Johannes Berg9d139c82008-07-09 14:40:37 +02002447 if (!skb)
2448 goto out;
2449
2450 hdr = (struct ieee80211_hdr *) skb->data;
Harvey Harrisone7827a72008-07-15 18:44:13 -07002451 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2452 IEEE80211_STYPE_BEACON);
Johannes Berg902acc72008-02-23 15:17:19 +01002453 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
Javier Cardonadbf498f2012-03-31 11:31:32 -07002454 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08002455 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
Johannes Berg472dbc42008-09-11 00:01:49 +02002456
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08002457 if (!bcn)
Johannes Bergac1bd842011-01-18 13:45:32 +01002458 goto out;
Johannes Bergac1bd842011-01-18 13:45:32 +01002459
Javier Cardonadbf498f2012-03-31 11:31:32 -07002460 if (ifmsh->sync_ops)
2461 ifmsh->sync_ops->adjust_tbtt(
2462 sdata);
2463
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -07002464 skb = dev_alloc_skb(local->tx_headroom +
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08002465 bcn->head_len +
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002466 256 + /* TIM IE */
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08002467 bcn->tail_len);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002468 if (!skb)
2469 goto out;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08002470 skb_reserve(skb, local->tx_headroom);
2471 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2472 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2473 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02002474 } else {
2475 WARN_ON(1);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002476 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02002477 }
2478
Johannes Berg4bf88532012-11-09 11:39:59 +01002479 band = chanctx_conf->def.chan->band;
Johannes Berg55de9082012-07-26 17:24:39 +02002480
Johannes Berge039fa42008-05-15 12:55:29 +02002481 info = IEEE80211_SKB_CB(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02002482
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002483 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002484 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Johannes Berge039fa42008-05-15 12:55:29 +02002485 info->band = band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002486
2487 memset(&txrc, 0, sizeof(txrc));
2488 txrc.hw = hw;
Johannes Berge31583c2012-07-26 14:07:46 +02002489 txrc.sband = local->hw.wiphy->bands[band];
Jouni Malinene00cfce2009-12-29 12:59:19 +02002490 txrc.bss_conf = &sdata->vif.bss_conf;
2491 txrc.skb = skb;
2492 txrc.reported_rate.idx = -1;
Jouni Malinen37eb0b12010-01-06 13:09:08 +02002493 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
Johannes Berge31583c2012-07-26 14:07:46 +02002494 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
Jouni Malinen37eb0b12010-01-06 13:09:08 +02002495 txrc.max_rate_idx = -1;
2496 else
2497 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Simon Wunderlich19468412012-01-28 17:25:33 +01002498 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2499 sizeof(txrc.rate_idx_mcs_mask));
Felix Fietkau8f0729b2010-11-11 15:07:23 +01002500 txrc.bss = true;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002501 rate_control_get_rate(sdata, NULL, &txrc);
Johannes Berge039fa42008-05-15 12:55:29 +02002502
2503 info->control.vif = vif;
Johannes Bergf591fa52008-07-10 11:21:26 +02002504
John W. Linvillea472e712010-05-06 14:45:17 -04002505 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2506 IEEE80211_TX_CTL_ASSIGN_SEQ |
2507 IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge6a98542008-10-21 12:40:02 +02002508 out:
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002509 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002510 return skb;
2511}
Johannes Bergeddcbb92009-10-29 08:30:35 +01002512EXPORT_SYMBOL(ieee80211_beacon_get_tim);
Johannes Berge2ebc742007-07-27 15:43:22 +02002513
Arik Nemtsov02945822011-11-10 11:28:57 +02002514struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2515 struct ieee80211_vif *vif)
2516{
2517 struct ieee80211_if_ap *ap = NULL;
Eyal Shapiraaa7a0082012-08-06 14:26:16 +03002518 struct sk_buff *skb = NULL;
2519 struct probe_resp *presp = NULL;
Arik Nemtsov02945822011-11-10 11:28:57 +02002520 struct ieee80211_hdr *hdr;
2521 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2522
2523 if (sdata->vif.type != NL80211_IFTYPE_AP)
2524 return NULL;
2525
2526 rcu_read_lock();
2527
2528 ap = &sdata->u.ap;
2529 presp = rcu_dereference(ap->probe_resp);
2530 if (!presp)
2531 goto out;
2532
Eyal Shapiraaa7a0082012-08-06 14:26:16 +03002533 skb = dev_alloc_skb(presp->len);
Arik Nemtsov02945822011-11-10 11:28:57 +02002534 if (!skb)
2535 goto out;
2536
Eyal Shapiraaa7a0082012-08-06 14:26:16 +03002537 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2538
Arik Nemtsov02945822011-11-10 11:28:57 +02002539 hdr = (struct ieee80211_hdr *) skb->data;
2540 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2541
2542out:
2543 rcu_read_unlock();
2544 return skb;
2545}
2546EXPORT_SYMBOL(ieee80211_proberesp_get);
2547
Kalle Valo7044cc52010-01-05 20:16:19 +02002548struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2549 struct ieee80211_vif *vif)
2550{
2551 struct ieee80211_sub_if_data *sdata;
2552 struct ieee80211_if_managed *ifmgd;
2553 struct ieee80211_pspoll *pspoll;
2554 struct ieee80211_local *local;
2555 struct sk_buff *skb;
2556
2557 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2558 return NULL;
2559
2560 sdata = vif_to_sdata(vif);
2561 ifmgd = &sdata->u.mgd;
2562 local = sdata->local;
2563
2564 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
Joe Perchesd15b8452011-08-29 14:17:31 -07002565 if (!skb)
Kalle Valo7044cc52010-01-05 20:16:19 +02002566 return NULL;
Joe Perchesd15b8452011-08-29 14:17:31 -07002567
Kalle Valo7044cc52010-01-05 20:16:19 +02002568 skb_reserve(skb, local->hw.extra_tx_headroom);
2569
2570 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2571 memset(pspoll, 0, sizeof(*pspoll));
2572 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2573 IEEE80211_STYPE_PSPOLL);
2574 pspoll->aid = cpu_to_le16(ifmgd->aid);
2575
2576 /* aid in PS-Poll has its two MSBs each set to 1 */
2577 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2578
2579 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2580 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2581
2582 return skb;
2583}
2584EXPORT_SYMBOL(ieee80211_pspoll_get);
2585
2586struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2587 struct ieee80211_vif *vif)
2588{
2589 struct ieee80211_hdr_3addr *nullfunc;
2590 struct ieee80211_sub_if_data *sdata;
2591 struct ieee80211_if_managed *ifmgd;
2592 struct ieee80211_local *local;
2593 struct sk_buff *skb;
2594
2595 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2596 return NULL;
2597
2598 sdata = vif_to_sdata(vif);
2599 ifmgd = &sdata->u.mgd;
2600 local = sdata->local;
2601
2602 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
Joe Perchesd15b8452011-08-29 14:17:31 -07002603 if (!skb)
Kalle Valo7044cc52010-01-05 20:16:19 +02002604 return NULL;
Joe Perchesd15b8452011-08-29 14:17:31 -07002605
Kalle Valo7044cc52010-01-05 20:16:19 +02002606 skb_reserve(skb, local->hw.extra_tx_headroom);
2607
2608 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2609 sizeof(*nullfunc));
2610 memset(nullfunc, 0, sizeof(*nullfunc));
2611 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2612 IEEE80211_STYPE_NULLFUNC |
2613 IEEE80211_FCTL_TODS);
2614 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2615 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2616 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2617
2618 return skb;
2619}
2620EXPORT_SYMBOL(ieee80211_nullfunc_get);
2621
Kalle Valo05e54ea2010-01-05 20:16:38 +02002622struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2623 struct ieee80211_vif *vif,
2624 const u8 *ssid, size_t ssid_len,
Johannes Bergb9a9ada2012-11-29 13:00:10 +01002625 size_t tailroom)
Kalle Valo05e54ea2010-01-05 20:16:38 +02002626{
2627 struct ieee80211_sub_if_data *sdata;
2628 struct ieee80211_local *local;
2629 struct ieee80211_hdr_3addr *hdr;
2630 struct sk_buff *skb;
2631 size_t ie_ssid_len;
2632 u8 *pos;
2633
2634 sdata = vif_to_sdata(vif);
2635 local = sdata->local;
2636 ie_ssid_len = 2 + ssid_len;
2637
2638 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
Johannes Bergb9a9ada2012-11-29 13:00:10 +01002639 ie_ssid_len + tailroom);
Joe Perchesd15b8452011-08-29 14:17:31 -07002640 if (!skb)
Kalle Valo05e54ea2010-01-05 20:16:38 +02002641 return NULL;
Kalle Valo05e54ea2010-01-05 20:16:38 +02002642
2643 skb_reserve(skb, local->hw.extra_tx_headroom);
2644
2645 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2646 memset(hdr, 0, sizeof(*hdr));
2647 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2648 IEEE80211_STYPE_PROBE_REQ);
Johannes Berge83e6542012-07-13 16:23:07 +02002649 eth_broadcast_addr(hdr->addr1);
Kalle Valo05e54ea2010-01-05 20:16:38 +02002650 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
Johannes Berge83e6542012-07-13 16:23:07 +02002651 eth_broadcast_addr(hdr->addr3);
Kalle Valo05e54ea2010-01-05 20:16:38 +02002652
2653 pos = skb_put(skb, ie_ssid_len);
2654 *pos++ = WLAN_EID_SSID;
2655 *pos++ = ssid_len;
Stanislaw Gruszka88c868c2012-03-29 16:30:41 +02002656 if (ssid_len)
Kalle Valo05e54ea2010-01-05 20:16:38 +02002657 memcpy(pos, ssid, ssid_len);
2658 pos += ssid_len;
2659
Kalle Valo05e54ea2010-01-05 20:16:38 +02002660 return skb;
2661}
2662EXPORT_SYMBOL(ieee80211_probereq_get);
2663
Johannes Berg32bfd352007-12-19 01:31:26 +01002664void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02002665 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02002666 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02002667 struct ieee80211_rts *rts)
2668{
2669 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02002670
Harvey Harrison065e96052008-06-22 16:45:27 -07002671 rts->frame_control =
2672 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01002673 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2674 frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02002675 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2676 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2677}
2678EXPORT_SYMBOL(ieee80211_rts_get);
2679
Johannes Berg32bfd352007-12-19 01:31:26 +01002680void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02002681 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02002682 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02002683 struct ieee80211_cts *cts)
2684{
2685 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02002686
Harvey Harrison065e96052008-06-22 16:45:27 -07002687 cts->frame_control =
2688 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01002689 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2690 frame_len, frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02002691 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2692}
2693EXPORT_SYMBOL(ieee80211_ctstoself_get);
2694
2695struct sk_buff *
Johannes Berg32bfd352007-12-19 01:31:26 +01002696ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
Johannes Berge039fa42008-05-15 12:55:29 +02002697 struct ieee80211_vif *vif)
Johannes Berge2ebc742007-07-27 15:43:22 +02002698{
2699 struct ieee80211_local *local = hw_to_local(hw);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002700 struct sk_buff *skb = NULL;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002701 struct ieee80211_tx_data tx;
Johannes Berge2ebc742007-07-27 15:43:22 +02002702 struct ieee80211_sub_if_data *sdata;
Marco Porschd012a602012-10-10 12:39:50 -07002703 struct ps_data *ps;
Johannes Berge039fa42008-05-15 12:55:29 +02002704 struct ieee80211_tx_info *info;
Johannes Berg55de9082012-07-26 17:24:39 +02002705 struct ieee80211_chanctx_conf *chanctx_conf;
Johannes Berge2ebc742007-07-27 15:43:22 +02002706
Johannes Berg32bfd352007-12-19 01:31:26 +01002707 sdata = vif_to_sdata(vif);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002708
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002709 rcu_read_lock();
Johannes Berg55de9082012-07-26 17:24:39 +02002710 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002711
Marco Porschd012a602012-10-10 12:39:50 -07002712 if (!chanctx_conf)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002713 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002714
Marco Porschd012a602012-10-10 12:39:50 -07002715 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2716 struct beacon_data *beacon =
2717 rcu_dereference(sdata->u.ap.beacon);
2718
2719 if (!beacon || !beacon->head)
2720 goto out;
2721
2722 ps = &sdata->u.ap.ps;
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002723 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2724 ps = &sdata->u.mesh.ps;
Marco Porschd012a602012-10-10 12:39:50 -07002725 } else {
2726 goto out;
2727 }
2728
2729 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002730 goto out; /* send buffered bc/mc only after DTIM beacon */
Johannes Berge039fa42008-05-15 12:55:29 +02002731
Johannes Berge2ebc742007-07-27 15:43:22 +02002732 while (1) {
Marco Porschd012a602012-10-10 12:39:50 -07002733 skb = skb_dequeue(&ps->bc_buf);
Johannes Berge2ebc742007-07-27 15:43:22 +02002734 if (!skb)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002735 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02002736 local->total_ps_buffered--;
2737
Marco Porschd012a602012-10-10 12:39:50 -07002738 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
Johannes Berge2ebc742007-07-27 15:43:22 +02002739 struct ieee80211_hdr *hdr =
2740 (struct ieee80211_hdr *) skb->data;
2741 /* more buffered multicast/broadcast frames ==> set
2742 * MoreData flag in IEEE 802.11 header to inform PS
2743 * STAs */
2744 hdr->frame_control |=
2745 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2746 }
2747
Marco Porsch7cbf9d02013-03-01 16:01:18 +01002748 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2749 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002750 if (!ieee80211_tx_prepare(sdata, &tx, skb))
Johannes Berge2ebc742007-07-27 15:43:22 +02002751 break;
2752 dev_kfree_skb_any(skb);
2753 }
Johannes Berge039fa42008-05-15 12:55:29 +02002754
2755 info = IEEE80211_SKB_CB(skb);
2756
Johannes Berg5cf121c2008-02-25 16:27:43 +01002757 tx.flags |= IEEE80211_TX_PS_BUFFERED;
Johannes Berg4bf88532012-11-09 11:39:59 +01002758 info->band = chanctx_conf->def.chan->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02002759
Johannes Berg97b045d2008-06-20 01:22:30 +02002760 if (invoke_tx_handlers(&tx))
Johannes Berge2ebc742007-07-27 15:43:22 +02002761 skb = NULL;
Johannes Berg97b045d2008-06-20 01:22:30 +02002762 out:
Johannes Bergd0709a62008-02-25 16:27:46 +01002763 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002764
2765 return skb;
2766}
2767EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002768
Johannes Berg55de9082012-07-26 17:24:39 +02002769void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2770 struct sk_buff *skb, int tid,
2771 enum ieee80211_band band)
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002772{
Christian Lamparter353d09c2012-07-07 15:07:13 +02002773 int ac = ieee802_1d_to_ac[tid & 7];
Johannes Berg3a25a8c2012-04-03 16:28:50 +02002774
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002775 skb_set_mac_header(skb, 0);
2776 skb_set_network_header(skb, 0);
2777 skb_set_transport_header(skb, 0);
2778
Johannes Berg3a25a8c2012-04-03 16:28:50 +02002779 skb_set_queue_mapping(skb, ac);
Helmut Schaacf6bb792011-12-15 10:18:34 +01002780 skb->priority = tid;
Johannes Bergcf0277e2010-01-05 18:00:58 +01002781
Johannes Berg89afe612013-02-13 15:39:57 +01002782 skb->dev = sdata->dev;
2783
Johannes Berg3d34deb2009-06-18 17:25:11 +02002784 /*
2785 * The other path calling ieee80211_xmit is from the tasklet,
2786 * and while we can handle concurrent transmissions locking
2787 * requirements are that we do not come into tx with bhs on.
2788 */
2789 local_bh_disable();
Johannes Berg55de9082012-07-26 17:24:39 +02002790 ieee80211_xmit(sdata, skb, band);
Johannes Berg3d34deb2009-06-18 17:25:11 +02002791 local_bh_enable();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002792}