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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>
Eric W. Biederman881d9662007-09-17 11:56:21 -070021#include <net/net_namespace.h>
Johannes Berge2ebc742007-07-27 15:43:22 +020022#include <net/ieee80211_radiotap.h>
23#include <net/cfg80211.h>
24#include <net/mac80211.h>
25#include <asm/unaligned.h>
26
27#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020028#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040029#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010030#include "mesh.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020031#include "wep.h"
32#include "wpa.h"
33#include "wme.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040034#include "rate.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020035
36#define IEEE80211_TX_OK 0
37#define IEEE80211_TX_AGAIN 1
Johannes Berg2de8e0d2009-03-23 17:28:35 +010038#define IEEE80211_TX_PENDING 2
Johannes Berge2ebc742007-07-27 15:43:22 +020039
40/* misc utils */
41
Johannes Berg03f93c32008-06-25 14:36:27 +030042static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
43 int next_frag_len)
Johannes Berge2ebc742007-07-27 15:43:22 +020044{
45 int rate, mrate, erp, dur, i;
Johannes Berg2e92e6f2008-05-15 12:55:27 +020046 struct ieee80211_rate *txrate;
Johannes Berge2ebc742007-07-27 15:43:22 +020047 struct ieee80211_local *local = tx->local;
Johannes Berg8318d782008-01-24 19:38:38 +010048 struct ieee80211_supported_band *sband;
Harvey Harrison358c8d92008-07-15 18:44:13 -070049 struct ieee80211_hdr *hdr;
Johannes Berge6a98542008-10-21 12:40:02 +020050 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
51
52 /* assume HW handles this */
53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
54 return 0;
55
56 /* uh huh? */
57 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
58 return 0;
Johannes Berge2ebc742007-07-27 15:43:22 +020059
Johannes Berg2e92e6f2008-05-15 12:55:27 +020060 sband = local->hw.wiphy->bands[tx->channel->band];
Johannes Berge6a98542008-10-21 12:40:02 +020061 txrate = &sband->bitrates[info->control.rates[0].idx];
Johannes Berg8318d782008-01-24 19:38:38 +010062
Johannes Berge6a98542008-10-21 12:40:02 +020063 erp = txrate->flags & IEEE80211_RATE_ERP_G;
Johannes Berge2ebc742007-07-27 15:43:22 +020064
65 /*
66 * data and mgmt (except PS Poll):
67 * - during CFP: 32768
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 *
75 * IEEE 802.11, 9.6:
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
80 * BSSBasicRateSet
81 */
Harvey Harrison358c8d92008-07-15 18:44:13 -070082 hdr = (struct ieee80211_hdr *)tx->skb->data;
83 if (ieee80211_is_ctl(hdr->frame_control)) {
Johannes Berge2ebc742007-07-27 15:43:22 +020084 /* TODO: These control frames are not currently sent by
Johannes Bergccd7b362008-09-11 00:01:56 +020085 * mac80211, but should they be implemented, this function
Johannes Berge2ebc742007-07-27 15:43:22 +020086 * needs to be updated to support duration field calculation.
87 *
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
95 * and its SIFS
96 * PS Poll: BIT(15) | BIT(14) | aid
97 */
98 return 0;
99 }
100
101 /* data/mgmt */
102 if (0 /* FIX: data/mgmt during CFP */)
Johannes Berg03f93c32008-06-25 14:36:27 +0300103 return cpu_to_le16(32768);
Johannes Berge2ebc742007-07-27 15:43:22 +0200104
105 if (group_addr) /* Group address as the destination - no ACK */
106 return 0;
107
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 */
118 rate = -1;
Johannes Berg8318d782008-01-24 19:38:38 +0100119 /* use lowest available if everything fails */
120 mrate = sband->bitrates[0].bitrate;
121 for (i = 0; i < sband->n_bitrates; i++) {
122 struct ieee80211_rate *r = &sband->bitrates[i];
123
124 if (r->bitrate > txrate->bitrate)
Johannes Berge2ebc742007-07-27 15:43:22 +0200125 break;
126
Johannes Bergbda39332008-10-11 01:51:51 +0200127 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
Johannes Berg8318d782008-01-24 19:38:38 +0100128 rate = r->bitrate;
Johannes Berge2ebc742007-07-27 15:43:22 +0200129
Johannes Berg8318d782008-01-24 19:38:38 +0100130 switch (sband->band) {
131 case IEEE80211_BAND_2GHZ: {
132 u32 flag;
133 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
134 flag = IEEE80211_RATE_MANDATORY_G;
135 else
136 flag = IEEE80211_RATE_MANDATORY_B;
137 if (r->flags & flag)
138 mrate = r->bitrate;
139 break;
140 }
141 case IEEE80211_BAND_5GHZ:
142 if (r->flags & IEEE80211_RATE_MANDATORY_A)
143 mrate = r->bitrate;
144 break;
145 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
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
159
160 dur = ieee80211_frame_duration(local, 10, rate, erp,
Johannes Bergbda39332008-10-11 01:51:51 +0200161 tx->sdata->vif.bss_conf.use_short_preamble);
Johannes Berge2ebc742007-07-27 15:43:22 +0200162
163 if (next_frag_len) {
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur *= 2; /* ACK + SIFS */
167 /* next fragment */
168 dur += ieee80211_frame_duration(local, next_frag_len,
Johannes Berg8318d782008-01-24 19:38:38 +0100169 txrate->bitrate, erp,
Johannes Bergbda39332008-10-11 01:51:51 +0200170 tx->sdata->vif.bss_conf.use_short_preamble);
Johannes Berge2ebc742007-07-27 15:43:22 +0200171 }
172
Johannes Berg03f93c32008-06-25 14:36:27 +0300173 return cpu_to_le16(dur);
Johannes Berge2ebc742007-07-27 15:43:22 +0200174}
175
Johannes Berg133b8222008-09-16 14:18:59 +0200176static int inline is_ieee80211_device(struct ieee80211_local *local,
177 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +0200178{
Johannes Berg133b8222008-09-16 14:18:59 +0200179 return local == wdev_priv(dev->ieee80211_ptr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200180}
181
182/* tx handlers */
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200183static ieee80211_tx_result debug_noinline
184ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
185{
186 struct ieee80211_local *local = tx->local;
Kalle Valo0c742112010-01-12 10:42:53 +0200187 struct ieee80211_if_managed *ifmgd;
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200188
189 /* driver doesn't support power save */
190 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
191 return TX_CONTINUE;
192
193 /* hardware does dynamic power save */
194 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
195 return TX_CONTINUE;
196
197 /* dynamic power save disabled */
198 if (local->hw.conf.dynamic_ps_timeout <= 0)
199 return TX_CONTINUE;
200
201 /* we are scanning, don't enable power save */
202 if (local->scanning)
203 return TX_CONTINUE;
204
205 if (!local->ps_sdata)
206 return TX_CONTINUE;
207
208 /* No point if we're going to suspend */
209 if (local->quiescing)
210 return TX_CONTINUE;
211
Kalle Valo0c742112010-01-12 10:42:53 +0200212 /* dynamic ps is supported only in managed mode */
213 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
214 return TX_CONTINUE;
215
216 ifmgd = &tx->sdata->u.mgd;
217
218 /*
219 * Don't wakeup from power save if u-apsd is enabled, voip ac has
220 * u-apsd enabled and the frame is in voip class. This effectively
221 * means that even if all access categories have u-apsd enabled, in
222 * practise u-apsd is only used with the voip ac. This is a
223 * workaround for the case when received voip class packets do not
224 * have correct qos tag for some reason, due the network or the
225 * peer application.
226 *
227 * Note: local->uapsd_queues access is racy here. If the value is
228 * changed via debugfs, user needs to reassociate manually to have
229 * everything in sync.
230 */
231 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
232 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
233 && skb_get_queue_mapping(tx->skb) == 0)
234 return TX_CONTINUE;
235
Kalle Valo5c1b98a2010-01-12 10:42:46 +0200236 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
237 ieee80211_stop_queues_by_reason(&local->hw,
238 IEEE80211_QUEUE_STOP_REASON_PS);
239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
241 }
242
243 mod_timer(&local->dynamic_ps_timer, jiffies +
244 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
245
246 return TX_CONTINUE;
247}
Johannes Berge2ebc742007-07-27 15:43:22 +0200248
Johannes Bergd9e8a702008-06-30 15:10:44 +0200249static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100250ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200251{
Harvey Harrison358c8d92008-07-15 18:44:13 -0700252
Johannes Berge039fa42008-05-15 12:55:29 +0200253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berge039fa42008-05-15 12:55:29 +0200254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge2ebc742007-07-27 15:43:22 +0200255 u32 sta_flags;
256
Johannes Berge039fa42008-05-15 12:55:29 +0200257 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100258 return TX_CONTINUE;
Johannes Berg58d41852007-09-26 17:53:18 +0200259
Helmut Schaa142b9f52009-07-23 13:18:01 +0200260 if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) &&
Kalle Valoa9a6fff2009-03-18 14:06:44 +0200261 !ieee80211_is_probe_req(hdr->frame_control) &&
262 !ieee80211_is_nullfunc(hdr->frame_control))
263 /*
264 * When software scanning only nullfunc frames (to notify
265 * the sleep state to the AP) and probe requests (for the
266 * active scan) are allowed, all other frames should not be
267 * sent and we should not get here, but if we do
268 * nonetheless, drop them to avoid sending them
269 * off-channel. See the link below and
270 * ieee80211_start_scan() for more.
271 *
272 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
273 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100274 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200275
Johannes Berg05c914f2008-09-11 00:01:58 +0200276 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100277 return TX_CONTINUE;
278
Johannes Berg5cf121c2008-02-25 16:27:43 +0100279 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100280 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200281
Johannes Berg07346f812008-05-03 01:02:02 +0200282 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
Johannes Berge2ebc742007-07-27 15:43:22 +0200283
Johannes Berg5cf121c2008-02-25 16:27:43 +0100284 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200285 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200286 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Harvey Harrison358c8d92008-07-15 18:44:13 -0700287 ieee80211_is_data(hdr->frame_control))) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200288#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
289 printk(KERN_DEBUG "%s: dropped data frame to not "
Johannes Berg0c68ae262008-10-27 15:56:10 -0700290 "associated station %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100291 tx->sdata->name, hdr->addr1);
Johannes Berge2ebc742007-07-27 15:43:22 +0200292#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
293 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100294 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200295 }
296 } else {
Harvey Harrison358c8d92008-07-15 18:44:13 -0700297 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
Johannes Berge2ebc742007-07-27 15:43:22 +0200298 tx->local->num_sta == 0 &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200299 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200300 /*
301 * No associated STAs - no need to send multicast
302 * frames.
303 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100304 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200305 }
Johannes Berg9ae54c82008-01-31 19:48:20 +0100306 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200307 }
308
Johannes Berg9ae54c82008-01-31 19:48:20 +0100309 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200310}
311
Johannes Berge2ebc742007-07-27 15:43:22 +0200312/* This function is called whenever the AP is about to exceed the maximum limit
313 * of buffered frames for power saving STAs. This situation should not really
314 * happen often during normal operation, so dropping the oldest buffered packet
315 * from each queue should be OK to make some room for new frames. */
316static void purge_old_ps_buffers(struct ieee80211_local *local)
317{
318 int total = 0, purged = 0;
319 struct sk_buff *skb;
320 struct ieee80211_sub_if_data *sdata;
321 struct sta_info *sta;
322
Johannes Berg79010422007-09-18 17:29:21 -0400323 /*
324 * virtual interfaces are protected by RCU
325 */
326 rcu_read_lock();
327
328 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200329 struct ieee80211_if_ap *ap;
Johannes Berg05c914f2008-09-11 00:01:58 +0200330 if (sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Berge2ebc742007-07-27 15:43:22 +0200331 continue;
332 ap = &sdata->u.ap;
333 skb = skb_dequeue(&ap->ps_bc_buf);
334 if (skb) {
335 purged++;
336 dev_kfree_skb(skb);
337 }
338 total += skb_queue_len(&ap->ps_bc_buf);
339 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200340
Johannes Bergd0709a62008-02-25 16:27:46 +0100341 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200342 skb = skb_dequeue(&sta->ps_tx_buf);
343 if (skb) {
344 purged++;
345 dev_kfree_skb(skb);
346 }
347 total += skb_queue_len(&sta->ps_tx_buf);
348 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100349
350 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +0200351
352 local->total_ps_buffered = total;
Rami Rosen54223992008-07-24 10:40:37 +0300353#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berge2ebc742007-07-27 15:43:22 +0200354 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -0400355 wiphy_name(local->hw.wiphy), purged);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200356#endif
Johannes Berge2ebc742007-07-27 15:43:22 +0200357}
358
Johannes Berg9ae54c82008-01-31 19:48:20 +0100359static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100360ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200361{
Johannes Berge039fa42008-05-15 12:55:29 +0200362 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700363 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berge039fa42008-05-15 12:55:29 +0200364
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100365 /*
366 * broadcast/multicast frame
367 *
368 * If any of the associated stations is in power save mode,
369 * the frame is buffered to be sent after DTIM beacon frame.
370 * This is done either by the hardware or us.
371 */
372
Johannes Berg3e122be2008-07-09 14:40:34 +0200373 /* powersaving STAs only in AP/VLAN mode */
374 if (!tx->sdata->bss)
375 return TX_CONTINUE;
376
377 /* no buffering for ordered frames */
Harvey Harrison358c8d92008-07-15 18:44:13 -0700378 if (ieee80211_has_order(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100379 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100380
381 /* no stations in PS mode */
382 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100383 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100384
Johannes Berg62b517c2009-10-29 12:19:21 +0100385 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
Johannes Berg62b12082009-08-10 16:04:15 +0200386
Johannes Berg62b517c2009-10-29 12:19:21 +0100387 /* device releases frame after DTIM beacon */
388 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
Johannes Berg62b12082009-08-10 16:04:15 +0200389 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200390
Johannes Berg62b12082009-08-10 16:04:15 +0200391 /* buffered in mac80211 */
392 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
393 purge_old_ps_buffers(tx->local);
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100394
Johannes Berg62b12082009-08-10 16:04:15 +0200395 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
396#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
397 if (net_ratelimit())
398 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100399 tx->sdata->name);
Johannes Berg62b12082009-08-10 16:04:15 +0200400#endif
401 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
402 } else
403 tx->local->total_ps_buffered++;
404
405 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
406
407 return TX_QUEUED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200408}
409
Jouni Malinenfb733332009-01-08 13:32:00 +0200410static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
411 struct sk_buff *skb)
412{
413 if (!ieee80211_is_mgmt(fc))
414 return 0;
415
416 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
417 return 0;
418
419 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
420 skb->data))
421 return 0;
422
423 return 1;
424}
425
Johannes Berg9ae54c82008-01-31 19:48:20 +0100426static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100427ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200428{
429 struct sta_info *sta = tx->sta;
Johannes Berge039fa42008-05-15 12:55:29 +0200430 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300432 struct ieee80211_local *local = tx->local;
Johannes Berg07346f812008-05-03 01:02:02 +0200433 u32 staflags;
Johannes Berge2ebc742007-07-27 15:43:22 +0200434
Joe Perchesf64f9e72009-11-29 16:55:45 -0800435 if (unlikely(!sta ||
436 ieee80211_is_probe_resp(hdr->frame_control) ||
437 ieee80211_is_auth(hdr->frame_control) ||
438 ieee80211_is_assoc_resp(hdr->frame_control) ||
439 ieee80211_is_reassoc_resp(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100440 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200441
Johannes Berg07346f812008-05-03 01:02:02 +0200442 staflags = get_sta_flags(sta);
443
Johannes Bergaf818582009-11-06 11:35:50 +0100444 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
Johannes Berg3fa52052009-07-24 13:23:09 +0200445 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200446#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700447 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
Johannes Berge2ebc742007-07-27 15:43:22 +0200448 "before %d)\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -0700449 sta->sta.addr, sta->sta.aid,
Johannes Berge2ebc742007-07-27 15:43:22 +0200450 skb_queue_len(&sta->ps_tx_buf));
451#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berge2ebc742007-07-27 15:43:22 +0200452 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
453 purge_old_ps_buffers(tx->local);
454 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
455 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
Rami Rosen54223992008-07-24 10:40:37 +0300456#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berge2ebc742007-07-27 15:43:22 +0200457 if (net_ratelimit()) {
Johannes Berg0c68ae262008-10-27 15:56:10 -0700458 printk(KERN_DEBUG "%s: STA %pM TX "
Johannes Berge2ebc742007-07-27 15:43:22 +0200459 "buffer full - dropping oldest frame\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100460 tx->sdata->name, sta->sta.addr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200461 }
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200462#endif
Johannes Berge2ebc742007-07-27 15:43:22 +0200463 dev_kfree_skb(old);
464 } else
465 tx->local->total_ps_buffered++;
Johannes Berg004c8722008-02-20 11:21:35 +0100466
Johannes Bergaf818582009-11-06 11:35:50 +0100467 /*
468 * Queue frame to be sent after STA wakes up/polls,
469 * but don't set the TIM bit if the driver is blocking
470 * wakeup or poll response transmissions anyway.
471 */
472 if (skb_queue_empty(&sta->ps_tx_buf) &&
473 !(staflags & WLAN_STA_PS_DRIVER))
Johannes Berg004c8722008-02-20 11:21:35 +0100474 sta_info_set_tim_bit(sta);
475
Johannes Berge039fa42008-05-15 12:55:29 +0200476 info->control.jiffies = jiffies;
Johannes Berg5061b0c2009-07-14 00:33:34 +0200477 info->control.vif = &tx->sdata->vif;
Johannes Berg8f77f382009-06-07 21:58:37 +0200478 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Johannes Berge2ebc742007-07-27 15:43:22 +0200479 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300480
481 if (!timer_pending(&local->sta_cleanup))
482 mod_timer(&local->sta_cleanup,
483 round_jiffies(jiffies +
484 STA_INFO_CLEANUP_INTERVAL));
485
Johannes Berg9ae54c82008-01-31 19:48:20 +0100486 return TX_QUEUED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200487 }
488#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Bergaf818582009-11-06 11:35:50 +0100489 else if (unlikely(staflags & WLAN_STA_PS_STA)) {
Johannes Berg0c68ae262008-10-27 15:56:10 -0700490 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
Johannes Berg47846c92009-11-25 17:46:19 +0100491 "set -> send frame\n", tx->sdata->name,
Johannes Berg0c68ae262008-10-27 15:56:10 -0700492 sta->sta.addr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200493 }
494#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berge2ebc742007-07-27 15:43:22 +0200495
Johannes Berg9ae54c82008-01-31 19:48:20 +0100496 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200497}
498
Johannes Bergd9e8a702008-06-30 15:10:44 +0200499static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100500ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200501{
Johannes Berg5cf121c2008-02-25 16:27:43 +0100502 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100503 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200504
Johannes Berg5cf121c2008-02-25 16:27:43 +0100505 if (tx->flags & IEEE80211_TX_UNICAST)
Johannes Berge2ebc742007-07-27 15:43:22 +0200506 return ieee80211_tx_h_unicast_ps_buf(tx);
507 else
508 return ieee80211_tx_h_multicast_ps_buf(tx);
509}
510
Johannes Bergd9e8a702008-06-30 15:10:44 +0200511static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100512ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200513{
John W. Linvilled3feaf52009-04-24 15:35:42 -0400514 struct ieee80211_key *key = NULL;
Johannes Berge039fa42008-05-15 12:55:29 +0200515 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700516 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400517
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200518 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
Johannes Berge2ebc742007-07-27 15:43:22 +0200519 tx->key = NULL;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400520 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
521 tx->key = key;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200522 else if (ieee80211_is_mgmt(hdr->frame_control) &&
Jouni Malinenecbcd322010-03-29 23:35:23 -0700523 is_multicast_ether_addr(hdr->addr1) &&
524 ieee80211_is_robust_mgmt_frame(hdr) &&
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200525 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
526 tx->key = key;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400527 else if ((key = rcu_dereference(tx->sdata->default_key)))
528 tx->key = key;
Johannes Berge2ebc742007-07-27 15:43:22 +0200529 else if (tx->sdata->drop_unencrypted &&
Johannes Bergd0f09802008-07-29 11:32:07 +0200530 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
Jouni Malinene0463f52009-01-19 16:52:00 +0200531 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
532 (!ieee80211_is_robust_mgmt_frame(hdr) ||
533 (ieee80211_is_action(hdr->frame_control) &&
534 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200535 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100536 return TX_DROP;
Johannes Berg176e4f82007-12-18 15:27:47 +0100537 } else
Johannes Berge2ebc742007-07-27 15:43:22 +0200538 tx->key = NULL;
539
540 if (tx->key) {
Johannes Berg813d7662010-01-17 01:47:58 +0100541 bool skip_hw = false;
542
Johannes Berge2ebc742007-07-27 15:43:22 +0200543 tx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400544 /* TODO: add threshold stuff again */
Johannes Berg176e4f82007-12-18 15:27:47 +0100545
546 switch (tx->key->conf.alg) {
547 case ALG_WEP:
Harvey Harrison358c8d92008-07-15 18:44:13 -0700548 if (ieee80211_is_auth(hdr->frame_control))
Johannes Berg176e4f82007-12-18 15:27:47 +0100549 break;
550 case ALG_TKIP:
Harvey Harrison358c8d92008-07-15 18:44:13 -0700551 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg176e4f82007-12-18 15:27:47 +0100552 tx->key = NULL;
553 break;
Jouni Malinenfb733332009-01-08 13:32:00 +0200554 case ALG_CCMP:
555 if (!ieee80211_is_data_present(hdr->frame_control) &&
556 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
557 tx->skb))
558 tx->key = NULL;
Kalle Valo3b43a182010-01-23 20:27:14 +0200559 else
560 skip_hw = (tx->key->conf.flags &
561 IEEE80211_KEY_FLAG_SW_MGMT) &&
562 ieee80211_is_mgmt(hdr->frame_control);
Jouni Malinenfb733332009-01-08 13:32:00 +0200563 break;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200564 case ALG_AES_CMAC:
565 if (!ieee80211_is_mgmt(hdr->frame_control))
566 tx->key = NULL;
567 break;
Johannes Berg176e4f82007-12-18 15:27:47 +0100568 }
Johannes Berg813d7662010-01-17 01:47:58 +0100569
Johannes Bergf12553e2010-01-22 22:07:59 +0100570 if (!skip_hw && tx->key &&
Johannes Berg382b1652010-01-25 11:36:16 +0100571 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
Johannes Berg813d7662010-01-17 01:47:58 +0100572 info->control.hw_key = &tx->key->conf;
Johannes Berge2ebc742007-07-27 15:43:22 +0200573 }
574
Johannes Berg9ae54c82008-01-31 19:48:20 +0100575 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200576}
577
Johannes Bergd9e8a702008-06-30 15:10:44 +0200578static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100579ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200580{
Johannes Berge039fa42008-05-15 12:55:29 +0200581 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200582 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
583 struct ieee80211_supported_band *sband;
584 struct ieee80211_rate *rate;
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700585 int i;
586 u32 len;
Johannes Berge6a98542008-10-21 12:40:02 +0200587 bool inval = false, rts = false, short_preamble = false;
588 struct ieee80211_tx_rate_control txrc;
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700589 u32 sta_flags;
Johannes Berge6a98542008-10-21 12:40:02 +0200590
591 memset(&txrc, 0, sizeof(txrc));
Johannes Berg8318d782008-01-24 19:38:38 +0100592
Johannes Berg2e92e6f2008-05-15 12:55:27 +0200593 sband = tx->local->hw.wiphy->bands[tx->channel->band];
Johannes Berge2ebc742007-07-27 15:43:22 +0200594
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700595 len = min_t(u32, tx->skb->len + FCS_LEN,
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200596 tx->local->hw.wiphy->frag_threshold);
Johannes Berg58d41852007-09-26 17:53:18 +0200597
Johannes Berge6a98542008-10-21 12:40:02 +0200598 /* set up the tx rate control struct we give the RC algo */
599 txrc.hw = local_to_hw(tx->local);
600 txrc.sband = sband;
601 txrc.bss_conf = &tx->sdata->vif.bss_conf;
602 txrc.skb = tx->skb;
603 txrc.reported_rate.idx = -1;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200604 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
605 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
606 txrc.max_rate_idx = -1;
607 else
608 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Jouni Malinene00cfce2009-12-29 12:59:19 +0200609 txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
Johannes Berg58d41852007-09-26 17:53:18 +0200610
Johannes Berge6a98542008-10-21 12:40:02 +0200611 /* set up RTS protection if desired */
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200612 if (len > tx->local->hw.wiphy->rts_threshold) {
Johannes Berge6a98542008-10-21 12:40:02 +0200613 txrc.rts = rts = true;
Johannes Berge2ebc742007-07-27 15:43:22 +0200614 }
Johannes Berge6a98542008-10-21 12:40:02 +0200615
616 /*
617 * Use short preamble if the BSS can handle it, but not for
618 * management frames unless we know the receiver can handle
619 * that -- the management frame might be to a station that
620 * just wants a probe response.
621 */
622 if (tx->sdata->vif.bss_conf.use_short_preamble &&
623 (ieee80211_is_data(hdr->frame_control) ||
624 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
625 txrc.short_preamble = short_preamble = true;
626
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700627 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
Johannes Berge6a98542008-10-21 12:40:02 +0200628
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700629 /*
630 * Lets not bother rate control if we're associated and cannot
631 * talk to the sta. This should not happen.
632 */
Helmut Schaafbe9c422009-07-23 12:14:04 +0200633 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700634 (sta_flags & WLAN_STA_ASSOC) &&
635 !rate_usable_index_exists(sband, &tx->sta->sta),
636 "%s: Dropped data frame as no usable bitrate found while "
637 "scanning and associated. Target station: "
638 "%pM on %d GHz band\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100639 tx->sdata->name, hdr->addr1,
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700640 tx->channel->band ? 5 : 2))
641 return TX_DROP;
642
643 /*
644 * If we're associated with the sta at this point we know we can at
645 * least send the frame at the lowest bit rate.
646 */
Johannes Berge6a98542008-10-21 12:40:02 +0200647 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
648
649 if (unlikely(info->control.rates[0].idx < 0))
650 return TX_DROP;
651
652 if (txrc.reported_rate.idx < 0)
653 txrc.reported_rate = info->control.rates[0];
654
655 if (tx->sta)
656 tx->sta->last_tx_rate = txrc.reported_rate;
657
658 if (unlikely(!info->control.rates[0].count))
659 info->control.rates[0].count = 1;
660
Gábor Stefanik99551512009-04-23 19:36:14 +0200661 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
662 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
663 info->control.rates[0].count = 1;
664
Johannes Berge6a98542008-10-21 12:40:02 +0200665 if (is_multicast_ether_addr(hdr->addr1)) {
666 /*
667 * XXX: verify the rate is in the basic rateset
668 */
669 return TX_CONTINUE;
670 }
671
672 /*
673 * set up the RTS/CTS rate as the fastest basic rate
674 * that is not faster than the data rate
675 *
676 * XXX: Should this check all retry rates?
677 */
678 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
679 s8 baserate = 0;
680
681 rate = &sband->bitrates[info->control.rates[0].idx];
682
683 for (i = 0; i < sband->n_bitrates; i++) {
684 /* must be a basic rate */
685 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
686 continue;
687 /* must not be faster than the data rate */
688 if (sband->bitrates[i].bitrate > rate->bitrate)
689 continue;
690 /* maximum */
691 if (sband->bitrates[baserate].bitrate <
692 sband->bitrates[i].bitrate)
693 baserate = i;
694 }
695
696 info->control.rts_cts_rate_idx = baserate;
697 }
698
699 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
700 /*
701 * make sure there's no valid rate following
702 * an invalid one, just in case drivers don't
703 * take the API seriously to stop at -1.
704 */
705 if (inval) {
706 info->control.rates[i].idx = -1;
707 continue;
708 }
709 if (info->control.rates[i].idx < 0) {
710 inval = true;
711 continue;
712 }
713
714 /*
715 * For now assume MCS is already set up correctly, this
716 * needs to be fixed.
717 */
718 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
719 WARN_ON(info->control.rates[i].idx > 76);
720 continue;
721 }
722
723 /* set up RTS protection if desired */
724 if (rts)
725 info->control.rates[i].flags |=
726 IEEE80211_TX_RC_USE_RTS_CTS;
727
728 /* RC is busted */
Sujith075cbc92008-10-23 12:14:02 +0530729 if (WARN_ON_ONCE(info->control.rates[i].idx >=
730 sband->n_bitrates)) {
Johannes Berge6a98542008-10-21 12:40:02 +0200731 info->control.rates[i].idx = -1;
732 continue;
733 }
734
735 rate = &sband->bitrates[info->control.rates[i].idx];
736
737 /* set up short preamble */
738 if (short_preamble &&
739 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
740 info->control.rates[i].flags |=
741 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
742
743 /* set up G protection */
744 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
745 rate->flags & IEEE80211_RATE_ERP_G)
746 info->control.rates[i].flags |=
747 IEEE80211_TX_RC_USE_CTS_PROTECT;
748 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200749
Johannes Berg9ae54c82008-01-31 19:48:20 +0100750 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200751}
752
Johannes Bergd9e8a702008-06-30 15:10:44 +0200753static ieee80211_tx_result debug_noinline
Johannes Bergf591fa52008-07-10 11:21:26 +0200754ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
755{
756 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
757 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
758 u16 *seq;
759 u8 *qc;
760 int tid;
761
Johannes Berg25d834e2008-09-12 22:52:47 +0200762 /*
763 * Packet injection may want to control the sequence
764 * number, if we have no matching interface then we
765 * neither assign one ourselves nor ask the driver to.
766 */
Johannes Berg5061b0c2009-07-14 00:33:34 +0200767 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
Johannes Berg25d834e2008-09-12 22:52:47 +0200768 return TX_CONTINUE;
769
Johannes Bergf591fa52008-07-10 11:21:26 +0200770 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
771 return TX_CONTINUE;
772
773 if (ieee80211_hdrlen(hdr->frame_control) < 24)
774 return TX_CONTINUE;
775
Johannes Berg94778282008-10-10 13:21:59 +0200776 /*
777 * Anything but QoS data that has a sequence number field
778 * (is long enough) gets a sequence number from the global
779 * counter.
780 */
Johannes Bergf591fa52008-07-10 11:21:26 +0200781 if (!ieee80211_is_data_qos(hdr->frame_control)) {
Johannes Berg94778282008-10-10 13:21:59 +0200782 /* driver should assign sequence number */
Johannes Bergf591fa52008-07-10 11:21:26 +0200783 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
Johannes Berg94778282008-10-10 13:21:59 +0200784 /* for pure STA mode without beacons, we can do it */
785 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
786 tx->sdata->sequence_number += 0x10;
Johannes Bergf591fa52008-07-10 11:21:26 +0200787 return TX_CONTINUE;
788 }
789
790 /*
791 * This should be true for injected/management frames only, for
792 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
793 * above since they are not QoS-data frames.
794 */
795 if (!tx->sta)
796 return TX_CONTINUE;
797
798 /* include per-STA, per-TID sequence counter */
799
800 qc = ieee80211_get_qos_ctl(hdr);
801 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
802 seq = &tx->sta->tid_seq[tid];
803
804 hdr->seq_ctrl = cpu_to_le16(*seq);
805
806 /* Increase the sequence number. */
807 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
808
809 return TX_CONTINUE;
810}
811
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100812static int ieee80211_fragment(struct ieee80211_local *local,
813 struct sk_buff *skb, int hdrlen,
814 int frag_threshold)
815{
816 struct sk_buff *tail = skb, *tmp;
817 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
818 int pos = hdrlen + per_fragm;
819 int rem = skb->len - hdrlen - per_fragm;
820
821 if (WARN_ON(rem < 0))
822 return -EINVAL;
823
824 while (rem) {
825 int fraglen = per_fragm;
826
827 if (fraglen > rem)
828 fraglen = rem;
829 rem -= fraglen;
830 tmp = dev_alloc_skb(local->tx_headroom +
831 frag_threshold +
832 IEEE80211_ENCRYPT_HEADROOM +
833 IEEE80211_ENCRYPT_TAILROOM);
834 if (!tmp)
835 return -ENOMEM;
836 tail->next = tmp;
837 tail = tmp;
838 skb_reserve(tmp, local->tx_headroom +
839 IEEE80211_ENCRYPT_HEADROOM);
840 /* copy control information */
841 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
842 skb_copy_queue_mapping(tmp, skb);
843 tmp->priority = skb->priority;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100844 tmp->dev = skb->dev;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100845
846 /* copy header and data */
847 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
848 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
849
850 pos += fraglen;
851 }
852
853 skb->len = hdrlen + per_fragm;
854 return 0;
855}
856
Johannes Bergf591fa52008-07-10 11:21:26 +0200857static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200858ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
859{
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100860 struct sk_buff *skb = tx->skb;
861 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
862 struct ieee80211_hdr *hdr = (void *)skb->data;
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200863 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100864 int hdrlen;
865 int fragnum;
Johannes Berge2454942008-05-15 12:55:28 +0200866
867 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
868 return TX_CONTINUE;
869
Johannes Bergeefce912008-05-17 00:57:13 +0200870 /*
871 * Warn when submitting a fragmented A-MPDU frame and drop it.
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200872 * This scenario is handled in ieee80211_tx_prepare but extra
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +0300873 * caution taken here as fragmented ampdu may cause Tx stop.
Johannes Bergeefce912008-05-17 00:57:13 +0200874 */
Sujith8b30b1f2008-10-24 09:55:27 +0530875 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Bergeefce912008-05-17 00:57:13 +0200876 return TX_DROP;
877
Harvey Harrison065e96052008-06-22 16:45:27 -0700878 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2454942008-05-15 12:55:28 +0200879
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100880 /* internal error, why is TX_FRAGMENTED set? */
Johannes Berg8ccd8f22009-04-29 23:35:56 +0200881 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100882 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200883
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100884 /*
885 * Now fragment the frame. This will allocate all the fragments and
886 * chain them (using skb as the first fragment) to skb->next.
887 * During transmission, we will remove the successfully transmitted
888 * fragments from this list. When the low-level driver rejects one
889 * of the fragments then we will simply pretend to accept the skb
890 * but store it away as pending.
891 */
892 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
893 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200894
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100895 /* update duration/seq/flags of fragments */
896 fragnum = 0;
897 do {
898 int next_len;
899 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
Johannes Berge2454942008-05-15 12:55:28 +0200900
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100901 hdr = (void *)skb->data;
902 info = IEEE80211_SKB_CB(skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200903
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100904 if (skb->next) {
905 hdr->frame_control |= morefrags;
906 next_len = skb->next->len;
Johannes Berge6a98542008-10-21 12:40:02 +0200907 /*
908 * No multi-rate retries for fragmented frames, that
909 * would completely throw off the NAV at other STAs.
910 */
911 info->control.rates[1].idx = -1;
912 info->control.rates[2].idx = -1;
913 info->control.rates[3].idx = -1;
914 info->control.rates[4].idx = -1;
915 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
916 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100917 } else {
918 hdr->frame_control &= ~morefrags;
919 next_len = 0;
Johannes Berge6a98542008-10-21 12:40:02 +0200920 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100921 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
922 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
923 fragnum++;
924 } while ((skb = skb->next));
Johannes Berge2454942008-05-15 12:55:28 +0200925
926 return TX_CONTINUE;
Johannes Berge2454942008-05-15 12:55:28 +0200927}
928
Johannes Bergd9e8a702008-06-30 15:10:44 +0200929static ieee80211_tx_result debug_noinline
Johannes Bergfeff1f22009-08-10 16:01:54 +0200930ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
931{
932 struct sk_buff *skb = tx->skb;
933
934 if (!tx->sta)
935 return TX_CONTINUE;
936
937 tx->sta->tx_packets++;
938 do {
939 tx->sta->tx_fragments++;
940 tx->sta->tx_bytes += skb->len;
941 } while ((skb = skb->next));
942
943 return TX_CONTINUE;
944}
945
946static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200947ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
948{
949 if (!tx->key)
950 return TX_CONTINUE;
951
952 switch (tx->key->conf.alg) {
953 case ALG_WEP:
954 return ieee80211_crypto_wep_encrypt(tx);
955 case ALG_TKIP:
956 return ieee80211_crypto_tkip_encrypt(tx);
957 case ALG_CCMP:
958 return ieee80211_crypto_ccmp_encrypt(tx);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200959 case ALG_AES_CMAC:
960 return ieee80211_crypto_aes_cmac_encrypt(tx);
Johannes Berge2454942008-05-15 12:55:28 +0200961 }
962
963 /* not reached */
964 WARN_ON(1);
965 return TX_DROP;
966}
967
Johannes Bergd9e8a702008-06-30 15:10:44 +0200968static ieee80211_tx_result debug_noinline
Johannes Berg03f93c32008-06-25 14:36:27 +0300969ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
970{
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100971 struct sk_buff *skb = tx->skb;
972 struct ieee80211_hdr *hdr;
973 int next_len;
974 bool group_addr;
Johannes Berg03f93c32008-06-25 14:36:27 +0300975
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100976 do {
977 hdr = (void *) skb->data;
Jouni Malinen7e0aae42009-05-19 19:25:58 +0300978 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
979 break; /* must not overwrite AID */
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100980 next_len = skb->next ? skb->next->len : 0;
981 group_addr = is_multicast_ether_addr(hdr->addr1);
Johannes Berg03f93c32008-06-25 14:36:27 +0300982
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100983 hdr->duration_id =
984 ieee80211_duration(tx, group_addr, next_len);
985 } while ((skb = skb->next));
Johannes Berg03f93c32008-06-25 14:36:27 +0300986
987 return TX_CONTINUE;
988}
989
Johannes Berge2ebc742007-07-27 15:43:22 +0200990/* actual transmit path */
991
992/*
993 * deal with packet injection down monitor interface
994 * with Radiotap Header -- only called for monitor mode interface
995 */
Johannes Berg27004b12009-06-09 19:48:25 +0200996static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
997 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +0200998{
999 /*
1000 * this is the moment to interpret and discard the radiotap header that
1001 * must be at the start of the packet injected in Monitor mode
1002 *
1003 * Need to take some care with endian-ness since radiotap
1004 * args are little-endian
1005 */
1006
1007 struct ieee80211_radiotap_iterator iterator;
1008 struct ieee80211_radiotap_header *rthdr =
1009 (struct ieee80211_radiotap_header *) skb->data;
Johannes Berg8318d782008-01-24 19:38:38 +01001010 struct ieee80211_supported_band *sband;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001011 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001012 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1013 NULL);
Johannes Berge2ebc742007-07-27 15:43:22 +02001014
Johannes Berg2e92e6f2008-05-15 12:55:27 +02001015 sband = tx->local->hw.wiphy->bands[tx->channel->band];
Johannes Berg8318d782008-01-24 19:38:38 +01001016
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001017 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001018 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +02001019
1020 /*
1021 * for every radiotap entry that is present
1022 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1023 * entries present, or -EINVAL on error)
1024 */
1025
1026 while (!ret) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001027 ret = ieee80211_radiotap_iterator_next(&iterator);
1028
1029 if (ret)
1030 continue;
1031
1032 /* see if this argument is something we can use */
1033 switch (iterator.this_arg_index) {
1034 /*
1035 * You must take care when dereferencing iterator.this_arg
1036 * for multibyte types... the pointer is not aligned. Use
1037 * get_unaligned((type *)iterator.this_arg) to dereference
1038 * iterator.this_arg for type "type" safely on all arches.
1039 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001040 case IEEE80211_RADIOTAP_FLAGS:
1041 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1042 /*
1043 * this indicates that the skb we have been
1044 * handed has the 32-bit FCS CRC at the end...
1045 * we should react to that by snipping it off
1046 * because it will be recomputed and added
1047 * on transmission
1048 */
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001049 if (skb->len < (iterator._max_length + FCS_LEN))
Johannes Berg27004b12009-06-09 19:48:25 +02001050 return false;
Johannes Berge2ebc742007-07-27 15:43:22 +02001051
1052 skb_trim(skb, skb->len - FCS_LEN);
1053 }
Johannes Berg58d41852007-09-26 17:53:18 +02001054 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001055 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
Johannes Berg58d41852007-09-26 17:53:18 +02001056 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
Johannes Berg5cf121c2008-02-25 16:27:43 +01001057 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +02001058 break;
1059
Johannes Berg58d41852007-09-26 17:53:18 +02001060 /*
1061 * Please update the file
1062 * Documentation/networking/mac80211-injection.txt
1063 * when parsing new fields here.
1064 */
1065
Johannes Berge2ebc742007-07-27 15:43:22 +02001066 default:
1067 break;
1068 }
1069 }
1070
1071 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
Johannes Berg27004b12009-06-09 19:48:25 +02001072 return false;
Johannes Berge2ebc742007-07-27 15:43:22 +02001073
1074 /*
1075 * remove the radiotap header
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001076 * iterator->_max_length was sanity-checked against
Johannes Berge2ebc742007-07-27 15:43:22 +02001077 * skb->len by iterator init
1078 */
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001079 skb_pull(skb, iterator._max_length);
Johannes Berge2ebc742007-07-27 15:43:22 +02001080
Johannes Berg27004b12009-06-09 19:48:25 +02001081 return true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001082}
1083
Johannes Berga622ab72010-06-10 10:21:39 +02001084static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1085 struct sk_buff *skb,
1086 struct ieee80211_tx_info *info,
1087 struct tid_ampdu_tx *tid_tx,
1088 int tid)
1089{
1090 bool queued = false;
1091
1092 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1093 info->flags |= IEEE80211_TX_CTL_AMPDU;
Johannes Berg0ab33702010-06-10 10:21:42 +02001094 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1095 /*
1096 * nothing -- this aggregation session is being started
1097 * but that might still fail with the driver
1098 */
Johannes Berga622ab72010-06-10 10:21:39 +02001099 } else {
1100 spin_lock(&tx->sta->lock);
1101 /*
1102 * Need to re-check now, because we may get here
1103 *
1104 * 1) in the window during which the setup is actually
1105 * already done, but not marked yet because not all
1106 * packets are spliced over to the driver pending
1107 * queue yet -- if this happened we acquire the lock
1108 * either before or after the splice happens, but
1109 * need to recheck which of these cases happened.
1110 *
1111 * 2) during session teardown, if the OPERATIONAL bit
1112 * was cleared due to the teardown but the pointer
1113 * hasn't been assigned NULL yet (or we loaded it
1114 * before it was assigned) -- in this case it may
1115 * now be NULL which means we should just let the
1116 * packet pass through because splicing the frames
1117 * back is already done.
1118 */
1119 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1120
1121 if (!tid_tx) {
1122 /* do nothing, let packet pass through */
1123 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1124 info->flags |= IEEE80211_TX_CTL_AMPDU;
1125 } else {
1126 queued = true;
1127 info->control.vif = &tx->sdata->vif;
1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1129 __skb_queue_tail(&tid_tx->pending, skb);
1130 }
1131 spin_unlock(&tx->sta->lock);
1132 }
1133
1134 return queued;
1135}
1136
Johannes Berg58d41852007-09-26 17:53:18 +02001137/*
1138 * initialises @tx
1139 */
Johannes Berg9ae54c82008-01-31 19:48:20 +01001140static ieee80211_tx_result
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001141ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1142 struct ieee80211_tx_data *tx,
1143 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001144{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001145 struct ieee80211_local *local = sdata->local;
Johannes Berg58d41852007-09-26 17:53:18 +02001146 struct ieee80211_hdr *hdr;
Johannes Berge039fa42008-05-15 12:55:29 +02001147 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Sujith8b30b1f2008-10-24 09:55:27 +05301148 int hdrlen, tid;
Johannes Berga622ab72010-06-10 10:21:39 +02001149 u8 *qc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001150
1151 memset(tx, 0, sizeof(*tx));
1152 tx->skb = skb;
Johannes Berge2ebc742007-07-27 15:43:22 +02001153 tx->local = local;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001154 tx->sdata = sdata;
Johannes Berge039fa42008-05-15 12:55:29 +02001155 tx->channel = local->hw.conf.channel;
Johannes Berge2ebc742007-07-27 15:43:22 +02001156 /*
Johannes Berg58d41852007-09-26 17:53:18 +02001157 * Set this flag (used below to indicate "automatic fragmentation"),
1158 * it will be cleared/left by radiotap as desired.
Johannes Berge2ebc742007-07-27 15:43:22 +02001159 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001160 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +02001161
1162 /* process and remove the injection radiotap header */
Felix Fietkau17ad3532010-01-31 21:56:25 +01001163 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
Johannes Berg27004b12009-06-09 19:48:25 +02001164 if (!__ieee80211_parse_tx_radiotap(tx, skb))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001165 return TX_DROP;
Johannes Berg58d41852007-09-26 17:53:18 +02001166
Johannes Berge2ebc742007-07-27 15:43:22 +02001167 /*
Johannes Berg58d41852007-09-26 17:53:18 +02001168 * __ieee80211_parse_tx_radiotap has now removed
1169 * the radiotap header that was present and pre-filled
1170 * 'tx' with tx control information.
Johannes Berge2ebc742007-07-27 15:43:22 +02001171 */
Felix Fietkau17ad3532010-01-31 21:56:25 +01001172 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
Johannes Berge2ebc742007-07-27 15:43:22 +02001173 }
1174
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001175 /*
1176 * If this flag is set to true anywhere, and we get here,
1177 * we are doing the needed processing, so remove the flag
1178 * now.
1179 */
1180 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1181
Johannes Berg58d41852007-09-26 17:53:18 +02001182 hdr = (struct ieee80211_hdr *) skb->data;
1183
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001184 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001185 tx->sta = rcu_dereference(sdata->u.vlan.sta);
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001186 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1187 return TX_DROP;
Felix Fietkaub4d57ad2010-01-31 23:25:24 +01001188 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001190 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001191 if (!tx->sta)
Johannes Bergabe60632009-11-25 17:46:18 +01001192 tx->sta = sta_info_get(sdata, hdr->addr1);
Johannes Berg58d41852007-09-26 17:53:18 +02001193
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001194 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1195 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001196 struct tid_ampdu_tx *tid_tx;
1197
Sujith8b30b1f2008-10-24 09:55:27 +05301198 qc = ieee80211_get_qos_ctl(hdr);
1199 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1200
Johannes Berga622ab72010-06-10 10:21:39 +02001201 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1202 if (tid_tx) {
1203 bool queued;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001204
Johannes Berga622ab72010-06-10 10:21:39 +02001205 queued = ieee80211_tx_prep_agg(tx, skb, info,
1206 tid_tx, tid);
1207
1208 if (unlikely(queued))
1209 return TX_QUEUED;
1210 }
Sujith8b30b1f2008-10-24 09:55:27 +05301211 }
1212
Jiri Slabybadffb72007-08-28 17:01:54 -04001213 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001214 tx->flags &= ~IEEE80211_TX_UNICAST;
Johannes Berge039fa42008-05-15 12:55:29 +02001215 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -04001216 } else {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001217 tx->flags |= IEEE80211_TX_UNICAST;
Johannes Bergd3707d92009-05-12 22:05:40 +02001218 if (unlikely(local->wifi_wme_noack_test))
1219 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1220 else
1221 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -04001222 }
Johannes Berg58d41852007-09-26 17:53:18 +02001223
Johannes Berg5cf121c2008-02-25 16:27:43 +01001224 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1225 if ((tx->flags & IEEE80211_TX_UNICAST) &&
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +02001226 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +03001227 !(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001228 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berg58d41852007-09-26 17:53:18 +02001229 else
Johannes Berg5cf121c2008-02-25 16:27:43 +01001230 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
Johannes Berg58d41852007-09-26 17:53:18 +02001231 }
1232
Johannes Berge2ebc742007-07-27 15:43:22 +02001233 if (!tx->sta)
Johannes Berge039fa42008-05-15 12:55:29 +02001234 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Berg07346f812008-05-03 01:02:02 +02001235 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
Johannes Berge039fa42008-05-15 12:55:29 +02001236 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Berg58d41852007-09-26 17:53:18 +02001237
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001238 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2ebc742007-07-27 15:43:22 +02001239 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1240 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1241 tx->ethertype = (pos[0] << 8) | pos[1];
1242 }
Johannes Berge039fa42008-05-15 12:55:29 +02001243 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge2ebc742007-07-27 15:43:22 +02001244
Johannes Berg9ae54c82008-01-31 19:48:20 +01001245 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +02001246}
1247
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001248static int __ieee80211_tx(struct ieee80211_local *local,
Johannes Berg1870cd72009-03-23 17:28:38 +01001249 struct sk_buff **skbp,
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001250 struct sta_info *sta,
1251 bool txpending)
Johannes Berge2ebc742007-07-27 15:43:22 +02001252{
Johannes Berg1870cd72009-03-23 17:28:38 +01001253 struct sk_buff *skb = *skbp, *next;
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001254 struct ieee80211_tx_info *info;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001255 struct ieee80211_sub_if_data *sdata;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001256 unsigned long flags;
Johannes Berga2208582009-03-23 17:28:40 +01001257 int ret, len;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001258 bool fragm = false;
Johannes Berge2ebc742007-07-27 15:43:22 +02001259
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001260 while (skb) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001261 int q = skb_get_queue_mapping(skb);
1262
1263 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1264 ret = IEEE80211_TX_OK;
1265 if (local->queue_stop_reasons[q] ||
1266 (!txpending && !skb_queue_empty(&local->pending[q])))
1267 ret = IEEE80211_TX_PENDING;
1268 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1269 if (ret != IEEE80211_TX_OK)
1270 return ret;
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001271
Johannes Bergf0e72852009-03-23 17:28:36 +01001272 info = IEEE80211_SKB_CB(skb);
1273
1274 if (fragm)
Johannes Berge6a98542008-10-21 12:40:02 +02001275 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
Johannes Berge039fa42008-05-15 12:55:29 +02001276 IEEE80211_TX_CTL_FIRST_FRAGMENT);
Johannes Bergf0e72852009-03-23 17:28:36 +01001277
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001278 next = skb->next;
Johannes Berga2208582009-03-23 17:28:40 +01001279 len = skb->len;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001280
Johannes Bergad5351d2009-08-07 16:42:15 +02001281 if (next)
1282 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1283
Johannes Berg5061b0c2009-07-14 00:33:34 +02001284 sdata = vif_to_sdata(info->control.vif);
1285
1286 switch (sdata->vif.type) {
1287 case NL80211_IFTYPE_MONITOR:
1288 info->control.vif = NULL;
1289 break;
1290 case NL80211_IFTYPE_AP_VLAN:
1291 info->control.vif = &container_of(sdata->bss,
1292 struct ieee80211_sub_if_data, u.ap)->vif;
1293 break;
1294 default:
1295 /* keep */
1296 break;
1297 }
1298
Johannes Bergec25acc2010-07-22 17:11:28 +02001299 if (sta && sta->uploaded)
1300 info->control.sta = &sta->sta;
1301 else
1302 info->control.sta = NULL;
1303
Johannes Berg24487982009-04-23 18:52:52 +02001304 ret = drv_tx(local, skb);
Johannes Berga2208582009-03-23 17:28:40 +01001305 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1306 dev_kfree_skb(skb);
1307 ret = NETDEV_TX_OK;
1308 }
Luis R. Rodriguez21f5fc72009-07-24 19:57:25 -04001309 if (ret != NETDEV_TX_OK) {
1310 info->control.vif = &sdata->vif;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001311 return IEEE80211_TX_AGAIN;
Luis R. Rodriguez21f5fc72009-07-24 19:57:25 -04001312 }
1313
Johannes Berg1870cd72009-03-23 17:28:38 +01001314 *skbp = skb = next;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001315 ieee80211_led_tx(local, 1);
1316 fragm = true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001317 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001318
Johannes Berge2ebc742007-07-27 15:43:22 +02001319 return IEEE80211_TX_OK;
1320}
1321
Johannes Berg97b045d2008-06-20 01:22:30 +02001322/*
1323 * Invoke TX handlers, return 0 on success and non-zero if the
1324 * frame was dropped or queued.
1325 */
1326static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1327{
Johannes Berg97b045d2008-06-20 01:22:30 +02001328 struct sk_buff *skb = tx->skb;
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001329 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg97b045d2008-06-20 01:22:30 +02001330 ieee80211_tx_result res = TX_DROP;
Johannes Berg97b045d2008-06-20 01:22:30 +02001331
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001332#define CALL_TXH(txh) \
1333 do { \
1334 res = txh(tx); \
1335 if (res != TX_CONTINUE) \
1336 goto txh_done; \
1337 } while (0)
Johannes Berg97b045d2008-06-20 01:22:30 +02001338
Kalle Valo5c1b98a2010-01-12 10:42:46 +02001339 CALL_TXH(ieee80211_tx_h_dynamic_ps);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001340 CALL_TXH(ieee80211_tx_h_check_assoc);
1341 CALL_TXH(ieee80211_tx_h_ps_buf);
1342 CALL_TXH(ieee80211_tx_h_select_key);
Johannes Bergaf65cd962009-11-17 18:18:36 +01001343 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1344 CALL_TXH(ieee80211_tx_h_rate_ctrl);
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001345
1346 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1347 goto txh_done;
1348
1349 CALL_TXH(ieee80211_tx_h_michael_mic_add);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001350 CALL_TXH(ieee80211_tx_h_sequence);
1351 CALL_TXH(ieee80211_tx_h_fragment);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001352 /* handlers after fragment must be aware of tx info fragmentation! */
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001353 CALL_TXH(ieee80211_tx_h_stats);
1354 CALL_TXH(ieee80211_tx_h_encrypt);
1355 CALL_TXH(ieee80211_tx_h_calculate_duration);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001356#undef CALL_TXH
1357
1358 txh_done:
Johannes Berg97b045d2008-06-20 01:22:30 +02001359 if (unlikely(res == TX_DROP)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001360 I802_DEBUG_INC(tx->local->tx_handlers_drop);
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001361 while (skb) {
1362 struct sk_buff *next;
1363
1364 next = skb->next;
1365 dev_kfree_skb(skb);
1366 skb = next;
1367 }
Johannes Berg97b045d2008-06-20 01:22:30 +02001368 return -1;
1369 } else if (unlikely(res == TX_QUEUED)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001370 I802_DEBUG_INC(tx->local->tx_handlers_queued);
Johannes Berg97b045d2008-06-20 01:22:30 +02001371 return -1;
1372 }
1373
1374 return 0;
1375}
1376
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001377static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1378 struct sk_buff *skb, bool txpending)
Johannes Berge2ebc742007-07-27 15:43:22 +02001379{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001380 struct ieee80211_local *local = sdata->local;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001381 struct ieee80211_tx_data tx;
Johannes Berg97b045d2008-06-20 01:22:30 +02001382 ieee80211_tx_result res_prepare;
Johannes Berge039fa42008-05-15 12:55:29 +02001383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg2a577d92009-03-23 17:28:37 +01001384 struct sk_buff *next;
1385 unsigned long flags;
1386 int ret, retries;
Johannes Berge2530082008-05-17 00:57:14 +02001387 u16 queue;
Johannes Berge2ebc742007-07-27 15:43:22 +02001388
Johannes Berge2530082008-05-17 00:57:14 +02001389 queue = skb_get_queue_mapping(skb);
1390
Johannes Berge2ebc742007-07-27 15:43:22 +02001391 if (unlikely(skb->len < 10)) {
1392 dev_kfree_skb(skb);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001393 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001394 }
1395
Johannes Bergd0709a62008-02-25 16:27:46 +01001396 rcu_read_lock();
1397
Johannes Berg58d41852007-09-26 17:53:18 +02001398 /* initialises tx */
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001399 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001400
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001401 if (unlikely(res_prepare == TX_DROP)) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001402 dev_kfree_skb(skb);
Johannes Bergd0709a62008-02-25 16:27:46 +01001403 rcu_read_unlock();
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001404 return;
1405 } else if (unlikely(res_prepare == TX_QUEUED)) {
1406 rcu_read_unlock();
1407 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001408 }
1409
Johannes Berg5cf121c2008-02-25 16:27:43 +01001410 tx.channel = local->hw.conf.channel;
Johannes Berge039fa42008-05-15 12:55:29 +02001411 info->band = tx.channel->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02001412
Johannes Berg97b045d2008-06-20 01:22:30 +02001413 if (invoke_tx_handlers(&tx))
1414 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02001415
Johannes Berg2a577d92009-03-23 17:28:37 +01001416 retries = 0;
1417 retry:
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001418 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
Johannes Berg2a577d92009-03-23 17:28:37 +01001419 switch (ret) {
1420 case IEEE80211_TX_OK:
1421 break;
1422 case IEEE80211_TX_AGAIN:
Johannes Bergeefce912008-05-17 00:57:13 +02001423 /*
1424 * Since there are no fragmented frames on A-MPDU
1425 * queues, there's no reason for a driver to reject
1426 * a frame there, warn and drop it.
1427 */
Johannes Berg2a577d92009-03-23 17:28:37 +01001428 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1429 goto drop;
1430 /* fall through */
1431 case IEEE80211_TX_PENDING:
1432 skb = tx.skb;
1433
1434 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1435
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001436 if (local->queue_stop_reasons[queue] ||
1437 !skb_queue_empty(&local->pending[queue])) {
1438 /*
1439 * if queue is stopped, queue up frames for later
1440 * transmission from the tasklet
1441 */
Johannes Berg2a577d92009-03-23 17:28:37 +01001442 do {
1443 next = skb->next;
1444 skb->next = NULL;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001445 if (unlikely(txpending))
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001446 __skb_queue_head(&local->pending[queue],
1447 skb);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001448 else
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001449 __skb_queue_tail(&local->pending[queue],
1450 skb);
Johannes Berg2a577d92009-03-23 17:28:37 +01001451 } while ((skb = next));
1452
Johannes Berg2a577d92009-03-23 17:28:37 +01001453 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1454 flags);
1455 } else {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001456 /*
1457 * otherwise retry, but this is a race condition or
1458 * a driver bug (which we warn about if it persists)
1459 */
Johannes Berg2a577d92009-03-23 17:28:37 +01001460 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1461 flags);
1462
1463 retries++;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001464 if (WARN(retries > 10, "tx refused but queue active\n"))
Vivek Natarajan97d97b82009-02-05 20:05:15 +05301465 goto drop;
Johannes Berge2ebc742007-07-27 15:43:22 +02001466 goto retry;
1467 }
Johannes Berge2ebc742007-07-27 15:43:22 +02001468 }
Johannes Berg97b045d2008-06-20 01:22:30 +02001469 out:
Johannes Bergd4e46a32007-09-14 11:10:24 -04001470 rcu_read_unlock();
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001471 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001472
1473 drop:
Johannes Bergd4e46a32007-09-14 11:10:24 -04001474 rcu_read_unlock();
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001475
1476 skb = tx.skb;
1477 while (skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001478 next = skb->next;
1479 dev_kfree_skb(skb);
1480 skb = next;
1481 }
Johannes Berge2ebc742007-07-27 15:43:22 +02001482}
1483
1484/* device xmit handlers */
1485
Johannes Berg23c07522008-05-29 10:38:53 +02001486static int ieee80211_skb_resize(struct ieee80211_local *local,
1487 struct sk_buff *skb,
1488 int head_need, bool may_encrypt)
1489{
1490 int tail_need = 0;
1491
1492 /*
1493 * This could be optimised, devices that do full hardware
1494 * crypto (including TKIP MMIC) need no tailroom... But we
1495 * have no drivers for such devices currently.
1496 */
1497 if (may_encrypt) {
1498 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1499 tail_need -= skb_tailroom(skb);
1500 tail_need = max_t(int, tail_need, 0);
1501 }
1502
1503 if (head_need || tail_need) {
1504 /* Sorry. Can't account for this any more */
1505 skb_orphan(skb);
1506 }
1507
1508 if (skb_header_cloned(skb))
1509 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1510 else
1511 I802_DEBUG_INC(local->tx_expand_skb_head);
1512
1513 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1514 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1515 wiphy_name(local->hw.wiphy));
1516 return -ENOMEM;
1517 }
1518
1519 /* update truesize too */
1520 skb->truesize += head_need + tail_need;
1521
1522 return 0;
1523}
1524
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001525static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1526 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001527{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001528 struct ieee80211_local *local = sdata->local;
Johannes Berge039fa42008-05-15 12:55:29 +02001529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001530 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001531 struct ieee80211_sub_if_data *tmp_sdata;
Johannes Berge2ebc742007-07-27 15:43:22 +02001532 int headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001533 bool may_encrypt;
Johannes Berge2ebc742007-07-27 15:43:22 +02001534
Johannes Bergd84f3232009-11-16 23:20:41 +01001535 rcu_read_lock();
1536
Javier Cardonacca89492009-08-10 17:29:29 -07001537 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
Johannes Berg25d834e2008-09-12 22:52:47 +02001538 int hdrlen;
1539 u16 len_rthdr;
1540
Felix Fietkau17ad3532010-01-31 21:56:25 +01001541 info->flags |= IEEE80211_TX_CTL_INJECTED |
1542 IEEE80211_TX_INTFL_HAS_RADIOTAP;
Johannes Berg25d834e2008-09-12 22:52:47 +02001543
1544 len_rthdr = ieee80211_get_radiotap_len(skb->data);
Pavel Roskin8ef86c72009-07-10 16:42:29 -04001545 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
Johannes Berg25d834e2008-09-12 22:52:47 +02001546 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1547
1548 /* check the header is complete in the frame */
1549 if (likely(skb->len >= len_rthdr + hdrlen)) {
1550 /*
1551 * We process outgoing injected frames that have a
1552 * local address we handle as though they are our
1553 * own frames.
1554 * This code here isn't entirely correct, the local
1555 * MAC address is not necessarily enough to find
1556 * the interface to use; for that proper VLAN/WDS
1557 * support we will need a different mechanism.
1558 */
1559
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001560 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
Johannes Berg25d834e2008-09-12 22:52:47 +02001561 list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01001562 if (!ieee80211_sdata_running(tmp_sdata))
Johannes Berg25d834e2008-09-12 22:52:47 +02001563 continue;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001564 if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Bergf1b33cb2009-02-06 00:27:32 +01001565 continue;
Johannes Berg47846c92009-11-25 17:46:19 +01001566 if (compare_ether_addr(tmp_sdata->vif.addr,
Björn Smedman9b1ce522009-10-24 20:55:09 +02001567 hdr->addr2) == 0) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001568 sdata = tmp_sdata;
Johannes Berg25d834e2008-09-12 22:52:47 +02001569 break;
1570 }
1571 }
Johannes Berg25d834e2008-09-12 22:52:47 +02001572 }
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001573 }
1574
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001575 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
Johannes Berg23c07522008-05-29 10:38:53 +02001576
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001577 headroom = local->tx_headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001578 if (may_encrypt)
1579 headroom += IEEE80211_ENCRYPT_HEADROOM;
1580 headroom -= skb_headroom(skb);
1581 headroom = max_t(int, 0, headroom);
1582
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001583 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
Johannes Berg23c07522008-05-29 10:38:53 +02001584 dev_kfree_skb(skb);
Johannes Bergd84f3232009-11-16 23:20:41 +01001585 rcu_read_unlock();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001586 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001587 }
1588
Johannes Berg5061b0c2009-07-14 00:33:34 +02001589 info->control.vif = &sdata->vif;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001590
Javier Cardonacca89492009-08-10 17:29:29 -07001591 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1592 ieee80211_is_data(hdr->frame_control) &&
1593 !is_multicast_ether_addr(hdr->addr1))
1594 if (mesh_nexthop_lookup(skb, sdata)) {
1595 /* skb queued: don't free */
Johannes Bergd84f3232009-11-16 23:20:41 +01001596 rcu_read_unlock();
Javier Cardonacca89492009-08-10 17:29:29 -07001597 return;
1598 }
1599
Johannes Bergcf0277e2010-01-05 18:00:58 +01001600 ieee80211_set_qos_hdr(local, skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001601 ieee80211_tx(sdata, skb, false);
Johannes Bergd84f3232009-11-16 23:20:41 +01001602 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001603}
1604
Stephen Hemmingerd0cf9c02009-08-31 19:50:57 +00001605netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1606 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02001607{
1608 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
Luis R. Rodriguez47f4d882009-01-30 09:08:29 -08001609 struct ieee80211_channel *chan = local->hw.conf.channel;
Johannes Berge2ebc742007-07-27 15:43:22 +02001610 struct ieee80211_radiotap_header *prthdr =
1611 (struct ieee80211_radiotap_header *)skb->data;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001612 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Andy Green9b8a74e2007-07-27 15:43:24 +02001613 u16 len_rthdr;
Johannes Berge2ebc742007-07-27 15:43:22 +02001614
Luis R. Rodriguez47f4d882009-01-30 09:08:29 -08001615 /*
1616 * Frame injection is not allowed if beaconing is not allowed
1617 * or if we need radar detection. Beaconing is usually not allowed when
1618 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1619 * Passive scan is also used in world regulatory domains where
1620 * your country is not known and as such it should be treated as
1621 * NO TX unless the channel is explicitly allowed in which case
1622 * your current regulatory domain would not have the passive scan
1623 * flag.
1624 *
1625 * Since AP mode uses monitor interfaces to inject/TX management
1626 * frames we can make AP mode the exception to this rule once it
1627 * supports radar detection as its implementation can deal with
1628 * radar detection by itself. We can do that later by adding a
1629 * monitor flag interfaces used for AP support.
1630 */
1631 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1632 IEEE80211_CHAN_PASSIVE_SCAN)))
1633 goto fail;
1634
Andy Green9b8a74e2007-07-27 15:43:24 +02001635 /* check for not even having the fixed radiotap header part */
1636 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1637 goto fail; /* too short to be possibly valid */
1638
1639 /* is it a header version we can trust to find length from? */
1640 if (unlikely(prthdr->it_version))
1641 goto fail; /* only version 0 is supported */
1642
1643 /* then there must be a radiotap header with a length we can use */
1644 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1645
1646 /* does the skb contain enough to deliver on the alleged length? */
1647 if (unlikely(skb->len < len_rthdr))
1648 goto fail; /* skb too short for claimed rt header extent */
Johannes Berge2ebc742007-07-27 15:43:22 +02001649
Johannes Berge2ebc742007-07-27 15:43:22 +02001650 /*
1651 * fix up the pointers accounting for the radiotap
1652 * header still being in there. We are being given
1653 * a precooked IEEE80211 header so no need for
1654 * normal processing
1655 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001656 skb_set_mac_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001657 /*
Andy Green9b8a74e2007-07-27 15:43:24 +02001658 * these are just fixed to the end of the rt area since we
1659 * don't have any better information and at this point, nobody cares
Johannes Berge2ebc742007-07-27 15:43:22 +02001660 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001661 skb_set_network_header(skb, len_rthdr);
1662 skb_set_transport_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001663
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001664 memset(info, 0, sizeof(*info));
1665
Johannes Berg7351c6b2009-11-19 01:08:30 +01001666 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1667
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001668 /* pass the radiotap header up to xmit */
1669 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001670 return NETDEV_TX_OK;
Andy Green9b8a74e2007-07-27 15:43:24 +02001671
1672fail:
1673 dev_kfree_skb(skb);
1674 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
Johannes Berge2ebc742007-07-27 15:43:22 +02001675}
1676
1677/**
1678 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1679 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1680 * @skb: packet to be sent
1681 * @dev: incoming interface
1682 *
1683 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1684 * not be freed, and caller is responsible for either retrying later or freeing
1685 * skb).
1686 *
1687 * This function takes in an Ethernet header and encapsulates it with suitable
1688 * IEEE 802.11 header based on which interface the packet is coming in. The
1689 * encapsulated packet will then be passed to master interface, wlan#.11, for
1690 * transmission (through low-level driver).
1691 */
Stephen Hemmingerd0cf9c02009-08-31 19:50:57 +00001692netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1693 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02001694{
Johannes Berg133b8222008-09-16 14:18:59 +02001695 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1696 struct ieee80211_local *local = sdata->local;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001697 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Patrick McHardy5b548142009-06-12 06:22:29 +00001698 int ret = NETDEV_TX_BUSY, head_need;
Harvey Harrison065e96052008-06-22 16:45:27 -07001699 u16 ethertype, hdrlen, meshhdrlen = 0;
1700 __le16 fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001701 struct ieee80211_hdr hdr;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001702 struct ieee80211s_hdr mesh_hdr;
Johannes Berge2ebc742007-07-27 15:43:22 +02001703 const u8 *encaps_data;
1704 int encaps_len, skip_header_bytes;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001705 int nh_pos, h_pos;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001706 struct sta_info *sta = NULL;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001707 u32 sta_flags = 0;
Johannes Berge2ebc742007-07-27 15:43:22 +02001708
Johannes Berge2ebc742007-07-27 15:43:22 +02001709 if (unlikely(skb->len < ETH_HLEN)) {
Patrick McHardyec634fe2009-07-05 19:23:38 -07001710 ret = NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02001711 goto fail;
1712 }
1713
1714 nh_pos = skb_network_header(skb) - skb->data;
1715 h_pos = skb_transport_header(skb) - skb->data;
1716
1717 /* convert Ethernet header to proper 802.11 header (based on
1718 * operation mode) */
1719 ethertype = (skb->data[12] << 8) | skb->data[13];
Harvey Harrison065e96052008-06-22 16:45:27 -07001720 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
Johannes Berge2ebc742007-07-27 15:43:22 +02001721
Johannes Berg51fb61e2007-12-19 01:31:27 +01001722 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02001723 case NL80211_IFTYPE_AP_VLAN:
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001724 rcu_read_lock();
Johannes Berg9bc383d2009-11-19 11:55:19 +01001725 sta = rcu_dereference(sdata->u.vlan.sta);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001726 if (sta) {
1727 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1728 /* RA TA DA SA */
1729 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001730 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001731 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1732 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1733 hdrlen = 30;
1734 sta_flags = get_sta_flags(sta);
1735 }
1736 rcu_read_unlock();
1737 if (sta)
1738 break;
1739 /* fall through */
1740 case NL80211_IFTYPE_AP:
Harvey Harrison065e96052008-06-22 16:45:27 -07001741 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001742 /* DA BSSID SA */
1743 memcpy(hdr.addr1, skb->data, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001744 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001745 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1746 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001747 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001748 case NL80211_IFTYPE_WDS:
Harvey Harrison065e96052008-06-22 16:45:27 -07001749 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001750 /* RA TA DA SA */
1751 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001752 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001753 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1754 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1755 hdrlen = 30;
Johannes Bergcf966832007-08-28 17:01:54 -04001756 break;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001757#ifdef CONFIG_MAC80211_MESH
Johannes Berg05c914f2008-09-11 00:01:58 +02001758 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg472dbc42008-09-11 00:01:49 +02001759 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001760 /* Do not send frames with mesh_ttl == 0 */
Johannes Berg472dbc42008-09-11 00:01:49 +02001761 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Patrick McHardyec634fe2009-07-05 19:23:38 -07001762 ret = NETDEV_TX_OK;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001763 goto fail;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001764 }
YanBo79617de2008-09-22 13:30:32 +08001765
Johannes Berg47846c92009-11-25 17:46:19 +01001766 if (compare_ether_addr(sdata->vif.addr,
1767 skb->data + ETH_ALEN) == 0) {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001768 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1769 skb->data, skb->data + ETH_ALEN);
1770 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1771 sdata, NULL, NULL, NULL);
YanBo79617de2008-09-22 13:30:32 +08001772 } else {
1773 /* packet from other interface */
1774 struct mesh_path *mppath;
Javier Cardona3c5772a2009-08-10 12:15:48 -07001775 int is_mesh_mcast = 1;
Johannes Berg15ff6362009-11-17 13:34:04 +01001776 const u8 *mesh_da;
YanBo79617de2008-09-22 13:30:32 +08001777
Javier Cardona3c5772a2009-08-10 12:15:48 -07001778 rcu_read_lock();
YanBo79617de2008-09-22 13:30:32 +08001779 if (is_multicast_ether_addr(skb->data))
Javier Cardona3c5772a2009-08-10 12:15:48 -07001780 /* DA TA mSA AE:SA */
1781 mesh_da = skb->data;
YanBo79617de2008-09-22 13:30:32 +08001782 else {
Johannes Berg15ff6362009-11-17 13:34:04 +01001783 static const u8 bcast[ETH_ALEN] =
1784 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1785
YanBo79617de2008-09-22 13:30:32 +08001786 mppath = mpp_path_lookup(skb->data, sdata);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001787 if (mppath) {
1788 /* RA TA mDA mSA AE:DA SA */
1789 mesh_da = mppath->mpp;
1790 is_mesh_mcast = 0;
Johannes Berg15ff6362009-11-17 13:34:04 +01001791 } else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001792 /* DA TA mSA AE:SA */
Johannes Berg15ff6362009-11-17 13:34:04 +01001793 mesh_da = bcast;
1794 }
YanBo79617de2008-09-22 13:30:32 +08001795 }
Javier Cardona3c5772a2009-08-10 12:15:48 -07001796 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
Johannes Berg47846c92009-11-25 17:46:19 +01001797 mesh_da, sdata->vif.addr);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001798 rcu_read_unlock();
1799 if (is_mesh_mcast)
1800 meshhdrlen =
1801 ieee80211_new_mesh_header(&mesh_hdr,
1802 sdata,
1803 skb->data + ETH_ALEN,
1804 NULL,
1805 NULL);
1806 else
1807 meshhdrlen =
1808 ieee80211_new_mesh_header(&mesh_hdr,
1809 sdata,
1810 NULL,
1811 skb->data,
1812 skb->data + ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001813
YanBo79617de2008-09-22 13:30:32 +08001814 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001815 break;
1816#endif
Johannes Berg05c914f2008-09-11 00:01:58 +02001817 case NL80211_IFTYPE_STATION:
Johannes Berg46900292009-02-15 12:44:28 +01001818 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
Johannes Berg9bc383d2009-11-19 11:55:19 +01001819 if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) {
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001820 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1821 /* RA TA DA SA */
Johannes Berg47846c92009-11-25 17:46:19 +01001822 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001823 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1824 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1825 hdrlen = 30;
1826 } else {
1827 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1828 /* BSSID SA DA */
1829 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1830 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1831 hdrlen = 24;
1832 }
Johannes Bergcf966832007-08-28 17:01:54 -04001833 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001834 case NL80211_IFTYPE_ADHOC:
Johannes Berge2ebc742007-07-27 15:43:22 +02001835 /* DA SA BSSID */
1836 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1837 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001838 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001839 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001840 break;
1841 default:
Patrick McHardyec634fe2009-07-05 19:23:38 -07001842 ret = NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02001843 goto fail;
1844 }
1845
Johannes Berg7d185b82008-01-28 17:11:43 +01001846 /*
1847 * There's no need to try to look up the destination
1848 * if it is a multicast address (which can only happen
1849 * in AP mode)
1850 */
1851 if (!is_multicast_ether_addr(hdr.addr1)) {
Johannes Bergd0709a62008-02-25 16:27:46 +01001852 rcu_read_lock();
Johannes Bergabe60632009-11-25 17:46:18 +01001853 sta = sta_info_get(sdata, hdr.addr1);
1854 if (sta)
Johannes Berg07346f812008-05-03 01:02:02 +02001855 sta_flags = get_sta_flags(sta);
Johannes Bergd0709a62008-02-25 16:27:46 +01001856 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001857 }
1858
Johannes Berg3434fbd2008-05-03 00:59:37 +02001859 /* receiver and we are QoS enabled, use a QoS type frame */
Johannes Berg176be722009-03-12 23:49:28 +01001860 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
Harvey Harrison065e96052008-06-22 16:45:27 -07001861 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001862 hdrlen += 2;
1863 }
1864
1865 /*
Johannes Berg238814f2008-01-28 17:19:37 +01001866 * Drop unicast frames to unauthorised stations unless they are
1867 * EAPOL frames from the local station.
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001868 */
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001869 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1870 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001871 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1872 !(ethertype == ETH_P_PAE &&
Johannes Berg47846c92009-11-25 17:46:19 +01001873 compare_ether_addr(sdata->vif.addr,
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001874 skb->data + ETH_ALEN) == 0))) {
1875#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001876 if (net_ratelimit())
Johannes Berg0c68ae262008-10-27 15:56:10 -07001877 printk(KERN_DEBUG "%s: dropped frame to %pM"
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001878 " (unauthorized port)\n", dev->name,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001879 hdr.addr1);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001880#endif
1881
1882 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1883
Patrick McHardyec634fe2009-07-05 19:23:38 -07001884 ret = NETDEV_TX_OK;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001885 goto fail;
1886 }
1887
Harvey Harrison065e96052008-06-22 16:45:27 -07001888 hdr.frame_control = fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001889 hdr.duration_id = 0;
1890 hdr.seq_ctrl = 0;
1891
1892 skip_header_bytes = ETH_HLEN;
1893 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1894 encaps_data = bridge_tunnel_header;
1895 encaps_len = sizeof(bridge_tunnel_header);
1896 skip_header_bytes -= 2;
1897 } else if (ethertype >= 0x600) {
1898 encaps_data = rfc1042_header;
1899 encaps_len = sizeof(rfc1042_header);
1900 skip_header_bytes -= 2;
1901 } else {
1902 encaps_data = NULL;
1903 encaps_len = 0;
1904 }
1905
1906 skb_pull(skb, skip_header_bytes);
1907 nh_pos -= skip_header_bytes;
1908 h_pos -= skip_header_bytes;
1909
Johannes Berg23c07522008-05-29 10:38:53 +02001910 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001911
Johannes Berg23c07522008-05-29 10:38:53 +02001912 /*
1913 * So we need to modify the skb header and hence need a copy of
1914 * that. The head_need variable above doesn't, so far, include
1915 * the needed header space that we don't need right away. If we
1916 * can, then we don't reallocate right now but only after the
1917 * frame arrives at the master device (if it does...)
1918 *
1919 * If we cannot, however, then we will reallocate to include all
1920 * the ever needed space. Also, if we need to reallocate it anyway,
1921 * make it big enough for everything we may ever need.
1922 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001923
David S. Miller3a5be7d2008-06-18 01:19:51 -07001924 if (head_need > 0 || skb_cloned(skb)) {
Johannes Berg23c07522008-05-29 10:38:53 +02001925 head_need += IEEE80211_ENCRYPT_HEADROOM;
1926 head_need += local->tx_headroom;
1927 head_need = max_t(int, 0, head_need);
1928 if (ieee80211_skb_resize(local, skb, head_need, true))
Johannes Berge2ebc742007-07-27 15:43:22 +02001929 goto fail;
Johannes Berge2ebc742007-07-27 15:43:22 +02001930 }
1931
1932 if (encaps_data) {
1933 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1934 nh_pos += encaps_len;
1935 h_pos += encaps_len;
1936 }
Johannes Bergc29b9b92007-09-14 11:10:24 -04001937
Yuri Ershove4ab7eb2010-06-29 15:08:06 +04001938#ifdef CONFIG_MAC80211_MESH
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001939 if (meshhdrlen > 0) {
1940 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1941 nh_pos += meshhdrlen;
1942 h_pos += meshhdrlen;
1943 }
Yuri Ershove4ab7eb2010-06-29 15:08:06 +04001944#endif
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001945
Harvey Harrison065e96052008-06-22 16:45:27 -07001946 if (ieee80211_is_data_qos(fc)) {
Johannes Bergc29b9b92007-09-14 11:10:24 -04001947 __le16 *qos_control;
1948
1949 qos_control = (__le16*) skb_push(skb, 2);
1950 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1951 /*
1952 * Maybe we could actually set some fields here, for now just
1953 * initialise to zero to indicate no special operation.
1954 */
1955 *qos_control = 0;
1956 } else
1957 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1958
Johannes Berge2ebc742007-07-27 15:43:22 +02001959 nh_pos += hdrlen;
1960 h_pos += hdrlen;
1961
Stephen Hemminger68aae112007-08-24 11:29:34 -07001962 dev->stats.tx_packets++;
1963 dev->stats.tx_bytes += skb->len;
Johannes Berge2ebc742007-07-27 15:43:22 +02001964
1965 /* Update skb pointers to various headers since this modified frame
1966 * is going to go through Linux networking code that may potentially
1967 * need things like pointer to IP header. */
1968 skb_set_mac_header(skb, 0);
1969 skb_set_network_header(skb, nh_pos);
1970 skb_set_transport_header(skb, h_pos);
1971
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001972 memset(info, 0, sizeof(*info));
1973
Johannes Berge2ebc742007-07-27 15:43:22 +02001974 dev->trans_start = jiffies;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001975 ieee80211_xmit(sdata, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001976
Patrick McHardyec634fe2009-07-05 19:23:38 -07001977 return NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02001978
1979 fail:
Patrick McHardyec634fe2009-07-05 19:23:38 -07001980 if (ret == NETDEV_TX_OK)
Johannes Berge2ebc742007-07-27 15:43:22 +02001981 dev_kfree_skb(skb);
1982
1983 return ret;
1984}
1985
Johannes Berge2ebc742007-07-27 15:43:22 +02001986
Johannes Berge2530082008-05-17 00:57:14 +02001987/*
1988 * ieee80211_clear_tx_pending may not be called in a context where
1989 * it is possible that it packets could come in again.
1990 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001991void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1992{
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001993 int i;
Johannes Berge2ebc742007-07-27 15:43:22 +02001994
Johannes Berg2a577d92009-03-23 17:28:37 +01001995 for (i = 0; i < local->hw.queues; i++)
1996 skb_queue_purge(&local->pending[i]);
Johannes Berge2ebc742007-07-27 15:43:22 +02001997}
1998
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001999static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2000 struct sk_buff *skb)
2001{
2002 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2003 struct ieee80211_sub_if_data *sdata;
2004 struct sta_info *sta;
2005 struct ieee80211_hdr *hdr;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002006 int ret;
2007 bool result = true;
2008
Johannes Berg5061b0c2009-07-14 00:33:34 +02002009 sdata = vif_to_sdata(info->control.vif);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002010
2011 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
Johannes Berg5061b0c2009-07-14 00:33:34 +02002012 ieee80211_tx(sdata, skb, true);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002013 } else {
2014 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergabe60632009-11-25 17:46:18 +01002015 sta = sta_info_get(sdata, hdr->addr1);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002016
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002017 ret = __ieee80211_tx(local, &skb, sta, true);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002018 if (ret != IEEE80211_TX_OK)
2019 result = false;
2020 }
2021
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002022 return result;
2023}
2024
Johannes Berge2530082008-05-17 00:57:14 +02002025/*
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002026 * Transmit all pending packets. Called from tasklet.
Johannes Berge2530082008-05-17 00:57:14 +02002027 */
Johannes Berge2ebc742007-07-27 15:43:22 +02002028void ieee80211_tx_pending(unsigned long data)
2029{
2030 struct ieee80211_local *local = (struct ieee80211_local *)data;
Johannes Berg7236fe22010-03-22 13:42:43 -07002031 struct ieee80211_sub_if_data *sdata;
Johannes Berg2a577d92009-03-23 17:28:37 +01002032 unsigned long flags;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002033 int i;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002034 bool txok;
Johannes Berge2ebc742007-07-27 15:43:22 +02002035
Johannes Bergf0e72852009-03-23 17:28:36 +01002036 rcu_read_lock();
Johannes Berg2a577d92009-03-23 17:28:37 +01002037
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002038 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
Johannes Berg176be722009-03-12 23:49:28 +01002039 for (i = 0; i < local->hw.queues; i++) {
Johannes Berg2a577d92009-03-23 17:28:37 +01002040 /*
2041 * If queue is stopped by something other than due to pending
2042 * frames, or we have no pending frames, proceed to next queue.
2043 */
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002044 if (local->queue_stop_reasons[i] ||
Johannes Berg2a577d92009-03-23 17:28:37 +01002045 skb_queue_empty(&local->pending[i]))
Johannes Berge2ebc742007-07-27 15:43:22 +02002046 continue;
Johannes Berge2530082008-05-17 00:57:14 +02002047
Johannes Berg2a577d92009-03-23 17:28:37 +01002048 while (!skb_queue_empty(&local->pending[i])) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002049 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
Johannes Berg5061b0c2009-07-14 00:33:34 +02002050 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg5061b0c2009-07-14 00:33:34 +02002051
Johannes Berga7bc3762009-07-27 10:33:31 +02002052 if (WARN_ON(!info->control.vif)) {
2053 kfree_skb(skb);
2054 continue;
2055 }
2056
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002057 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2058 flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01002059
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002060 txok = ieee80211_tx_pending_skb(local, skb);
2061 if (!txok)
2062 __skb_queue_head(&local->pending[i], skb);
2063 spin_lock_irqsave(&local->queue_stop_reason_lock,
2064 flags);
2065 if (!txok)
Johannes Berg2a577d92009-03-23 17:28:37 +01002066 break;
Johannes Berge2ebc742007-07-27 15:43:22 +02002067 }
Johannes Berg7236fe22010-03-22 13:42:43 -07002068
2069 if (skb_queue_empty(&local->pending[i]))
2070 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2071 netif_tx_wake_queue(
2072 netdev_get_tx_queue(sdata->dev, i));
Johannes Berge2ebc742007-07-27 15:43:22 +02002073 }
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002074 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01002075
Johannes Bergf0e72852009-03-23 17:28:36 +01002076 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002077}
2078
2079/* functions for drivers to get certain frames */
2080
Rami Rosen8e7be8d2008-12-01 13:56:55 +02002081static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002082 struct sk_buff *skb,
2083 struct beacon_data *beacon)
Johannes Berge2ebc742007-07-27 15:43:22 +02002084{
2085 u8 *pos, *tim;
2086 int aid0 = 0;
2087 int i, have_bits = 0, n1, n2;
2088
2089 /* Generate bitmap for TIM only if there are any STAs in power save
2090 * mode. */
Johannes Berge2ebc742007-07-27 15:43:22 +02002091 if (atomic_read(&bss->num_sta_ps) > 0)
2092 /* in the hope that this is faster than
2093 * checking byte-for-byte */
2094 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2095 IEEE80211_MAX_AID+1);
2096
2097 if (bss->dtim_count == 0)
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002098 bss->dtim_count = beacon->dtim_period - 1;
Johannes Berge2ebc742007-07-27 15:43:22 +02002099 else
2100 bss->dtim_count--;
2101
2102 tim = pos = (u8 *) skb_put(skb, 6);
2103 *pos++ = WLAN_EID_TIM;
2104 *pos++ = 4;
2105 *pos++ = bss->dtim_count;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002106 *pos++ = beacon->dtim_period;
Johannes Berge2ebc742007-07-27 15:43:22 +02002107
2108 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2109 aid0 = 1;
2110
2111 if (have_bits) {
2112 /* Find largest even number N1 so that bits numbered 1 through
2113 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2114 * (N2 + 1) x 8 through 2007 are 0. */
2115 n1 = 0;
2116 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2117 if (bss->tim[i]) {
2118 n1 = i & 0xfe;
2119 break;
2120 }
2121 }
2122 n2 = n1;
2123 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2124 if (bss->tim[i]) {
2125 n2 = i;
2126 break;
2127 }
2128 }
2129
2130 /* Bitmap control */
2131 *pos++ = n1 | aid0;
2132 /* Part Virt Bitmap */
2133 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2134
2135 tim[1] = n2 - n1 + 4;
2136 skb_put(skb, n2 - n1);
2137 } else {
2138 *pos++ = aid0; /* Bitmap control */
2139 *pos++ = 0; /* Part Virt Bitmap */
2140 }
Johannes Berge2ebc742007-07-27 15:43:22 +02002141}
2142
Johannes Bergeddcbb92009-10-29 08:30:35 +01002143struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2144 struct ieee80211_vif *vif,
2145 u16 *tim_offset, u16 *tim_length)
Johannes Berge2ebc742007-07-27 15:43:22 +02002146{
2147 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg9d139c82008-07-09 14:40:37 +02002148 struct sk_buff *skb = NULL;
Johannes Berge039fa42008-05-15 12:55:29 +02002149 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02002150 struct ieee80211_sub_if_data *sdata = NULL;
2151 struct ieee80211_if_ap *ap = NULL;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002152 struct beacon_data *beacon;
Johannes Berg8318d782008-01-24 19:38:38 +01002153 struct ieee80211_supported_band *sband;
Johannes Berg2e92e6f2008-05-15 12:55:27 +02002154 enum ieee80211_band band = local->hw.conf.channel->band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002155 struct ieee80211_tx_rate_control txrc;
Johannes Berg8318d782008-01-24 19:38:38 +01002156
Johannes Berg2e92e6f2008-05-15 12:55:27 +02002157 sband = local->hw.wiphy->bands[band];
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002158
2159 rcu_read_lock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002160
Johannes Berg32bfd352007-12-19 01:31:26 +01002161 sdata = vif_to_sdata(vif);
Johannes Berge2ebc742007-07-27 15:43:22 +02002162
Johannes Bergeddcbb92009-10-29 08:30:35 +01002163 if (tim_offset)
2164 *tim_offset = 0;
2165 if (tim_length)
2166 *tim_length = 0;
2167
Johannes Berg05c914f2008-09-11 00:01:58 +02002168 if (sdata->vif.type == NL80211_IFTYPE_AP) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002169 ap = &sdata->u.ap;
2170 beacon = rcu_dereference(ap->beacon);
Johannes Berg902acc72008-02-23 15:17:19 +01002171 if (ap && beacon) {
2172 /*
2173 * headroom, head length,
2174 * tail length and maximum TIM length
2175 */
2176 skb = dev_alloc_skb(local->tx_headroom +
2177 beacon->head_len +
2178 beacon->tail_len + 256);
2179 if (!skb)
2180 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002181
Johannes Berg902acc72008-02-23 15:17:19 +01002182 skb_reserve(skb, local->tx_headroom);
2183 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2184 beacon->head_len);
2185
Johannes Bergd0709a62008-02-25 16:27:46 +01002186 /*
2187 * Not very nice, but we want to allow the driver to call
2188 * ieee80211_beacon_get() as a response to the set_tim()
2189 * callback. That, however, is already invoked under the
2190 * sta_lock to guarantee consistent and race-free update
2191 * of the tim bitmap in mac80211 and the driver.
2192 */
2193 if (local->tim_in_locked_section) {
Rami Rosen8e7be8d2008-12-01 13:56:55 +02002194 ieee80211_beacon_add_tim(ap, skb, beacon);
Johannes Bergd0709a62008-02-25 16:27:46 +01002195 } else {
2196 unsigned long flags;
2197
2198 spin_lock_irqsave(&local->sta_lock, flags);
Rami Rosen8e7be8d2008-12-01 13:56:55 +02002199 ieee80211_beacon_add_tim(ap, skb, beacon);
Johannes Bergd0709a62008-02-25 16:27:46 +01002200 spin_unlock_irqrestore(&local->sta_lock, flags);
2201 }
Johannes Berg902acc72008-02-23 15:17:19 +01002202
Johannes Bergeddcbb92009-10-29 08:30:35 +01002203 if (tim_offset)
2204 *tim_offset = beacon->head_len;
2205 if (tim_length)
2206 *tim_length = skb->len - beacon->head_len;
2207
Johannes Berg902acc72008-02-23 15:17:19 +01002208 if (beacon->tail)
2209 memcpy(skb_put(skb, beacon->tail_len),
2210 beacon->tail, beacon->tail_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02002211 } else
2212 goto out;
Johannes Berg05c914f2008-09-11 00:01:58 +02002213 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Johannes Berg46900292009-02-15 12:44:28 +01002214 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg9d139c82008-07-09 14:40:37 +02002215 struct ieee80211_hdr *hdr;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002216 struct sk_buff *presp = rcu_dereference(ifibss->presp);
Johannes Berg902acc72008-02-23 15:17:19 +01002217
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002218 if (!presp)
Johannes Berg9d139c82008-07-09 14:40:37 +02002219 goto out;
2220
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002221 skb = skb_copy(presp, GFP_ATOMIC);
Johannes Berg9d139c82008-07-09 14:40:37 +02002222 if (!skb)
2223 goto out;
2224
2225 hdr = (struct ieee80211_hdr *) skb->data;
Harvey Harrisone7827a72008-07-15 18:44:13 -07002226 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2227 IEEE80211_STYPE_BEACON);
Johannes Berg902acc72008-02-23 15:17:19 +01002228 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
Johannes Berg472dbc42008-09-11 00:01:49 +02002229 struct ieee80211_mgmt *mgmt;
2230 u8 *pos;
2231
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002232 /* headroom, head length, tail length and maximum TIM length */
Johannes Berg902acc72008-02-23 15:17:19 +01002233 skb = dev_alloc_skb(local->tx_headroom + 400);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002234 if (!skb)
2235 goto out;
2236
Johannes Berg902acc72008-02-23 15:17:19 +01002237 skb_reserve(skb, local->hw.extra_tx_headroom);
2238 mgmt = (struct ieee80211_mgmt *)
2239 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2240 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
Harvey Harrison065e96052008-06-22 16:45:27 -07002241 mgmt->frame_control =
2242 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
Johannes Berg902acc72008-02-23 15:17:19 +01002243 memset(mgmt->da, 0xff, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002244 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2245 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg902acc72008-02-23 15:17:19 +01002246 mgmt->u.beacon.beacon_int =
Johannes Berg57c4d7b2009-04-23 16:10:04 +02002247 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
Johannes Berg902acc72008-02-23 15:17:19 +01002248 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002249
Johannes Berg902acc72008-02-23 15:17:19 +01002250 pos = skb_put(skb, 2);
2251 *pos++ = WLAN_EID_SSID;
2252 *pos++ = 0x0;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002253
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12002254 mesh_mgmt_ies_add(skb, sdata);
Johannes Berg9d139c82008-07-09 14:40:37 +02002255 } else {
2256 WARN_ON(1);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002257 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02002258 }
2259
Johannes Berge039fa42008-05-15 12:55:29 +02002260 info = IEEE80211_SKB_CB(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02002261
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002262 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002263 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Johannes Berge039fa42008-05-15 12:55:29 +02002264 info->band = band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002265
2266 memset(&txrc, 0, sizeof(txrc));
2267 txrc.hw = hw;
2268 txrc.sband = sband;
2269 txrc.bss_conf = &sdata->vif.bss_conf;
2270 txrc.skb = skb;
2271 txrc.reported_rate.idx = -1;
Jouni Malinen37eb0b12010-01-06 13:09:08 +02002272 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2273 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2274 txrc.max_rate_idx = -1;
2275 else
2276 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002277 txrc.ap = true;
2278 rate_control_get_rate(sdata, NULL, &txrc);
Johannes Berge039fa42008-05-15 12:55:29 +02002279
2280 info->control.vif = vif;
Johannes Bergf591fa52008-07-10 11:21:26 +02002281
John W. Linvillea472e712010-05-06 14:45:17 -04002282 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2283 IEEE80211_TX_CTL_ASSIGN_SEQ |
2284 IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge6a98542008-10-21 12:40:02 +02002285 out:
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002286 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002287 return skb;
2288}
Johannes Bergeddcbb92009-10-29 08:30:35 +01002289EXPORT_SYMBOL(ieee80211_beacon_get_tim);
Johannes Berge2ebc742007-07-27 15:43:22 +02002290
Kalle Valo7044cc52010-01-05 20:16:19 +02002291struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2292 struct ieee80211_vif *vif)
2293{
2294 struct ieee80211_sub_if_data *sdata;
2295 struct ieee80211_if_managed *ifmgd;
2296 struct ieee80211_pspoll *pspoll;
2297 struct ieee80211_local *local;
2298 struct sk_buff *skb;
2299
2300 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2301 return NULL;
2302
2303 sdata = vif_to_sdata(vif);
2304 ifmgd = &sdata->u.mgd;
2305 local = sdata->local;
2306
2307 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2308 if (!skb) {
2309 printk(KERN_DEBUG "%s: failed to allocate buffer for "
2310 "pspoll template\n", sdata->name);
2311 return NULL;
2312 }
2313 skb_reserve(skb, local->hw.extra_tx_headroom);
2314
2315 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2316 memset(pspoll, 0, sizeof(*pspoll));
2317 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2318 IEEE80211_STYPE_PSPOLL);
2319 pspoll->aid = cpu_to_le16(ifmgd->aid);
2320
2321 /* aid in PS-Poll has its two MSBs each set to 1 */
2322 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2323
2324 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2325 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2326
2327 return skb;
2328}
2329EXPORT_SYMBOL(ieee80211_pspoll_get);
2330
2331struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2332 struct ieee80211_vif *vif)
2333{
2334 struct ieee80211_hdr_3addr *nullfunc;
2335 struct ieee80211_sub_if_data *sdata;
2336 struct ieee80211_if_managed *ifmgd;
2337 struct ieee80211_local *local;
2338 struct sk_buff *skb;
2339
2340 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2341 return NULL;
2342
2343 sdata = vif_to_sdata(vif);
2344 ifmgd = &sdata->u.mgd;
2345 local = sdata->local;
2346
2347 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2348 if (!skb) {
2349 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2350 "template\n", sdata->name);
2351 return NULL;
2352 }
2353 skb_reserve(skb, local->hw.extra_tx_headroom);
2354
2355 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2356 sizeof(*nullfunc));
2357 memset(nullfunc, 0, sizeof(*nullfunc));
2358 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2359 IEEE80211_STYPE_NULLFUNC |
2360 IEEE80211_FCTL_TODS);
2361 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2362 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2363 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2364
2365 return skb;
2366}
2367EXPORT_SYMBOL(ieee80211_nullfunc_get);
2368
Kalle Valo05e54ea2010-01-05 20:16:38 +02002369struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2370 struct ieee80211_vif *vif,
2371 const u8 *ssid, size_t ssid_len,
2372 const u8 *ie, size_t ie_len)
2373{
2374 struct ieee80211_sub_if_data *sdata;
2375 struct ieee80211_local *local;
2376 struct ieee80211_hdr_3addr *hdr;
2377 struct sk_buff *skb;
2378 size_t ie_ssid_len;
2379 u8 *pos;
2380
2381 sdata = vif_to_sdata(vif);
2382 local = sdata->local;
2383 ie_ssid_len = 2 + ssid_len;
2384
2385 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2386 ie_ssid_len + ie_len);
2387 if (!skb) {
2388 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
2389 "request template\n", sdata->name);
2390 return NULL;
2391 }
2392
2393 skb_reserve(skb, local->hw.extra_tx_headroom);
2394
2395 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2396 memset(hdr, 0, sizeof(*hdr));
2397 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2398 IEEE80211_STYPE_PROBE_REQ);
2399 memset(hdr->addr1, 0xff, ETH_ALEN);
2400 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2401 memset(hdr->addr3, 0xff, ETH_ALEN);
2402
2403 pos = skb_put(skb, ie_ssid_len);
2404 *pos++ = WLAN_EID_SSID;
2405 *pos++ = ssid_len;
2406 if (ssid)
2407 memcpy(pos, ssid, ssid_len);
2408 pos += ssid_len;
2409
2410 if (ie) {
2411 pos = skb_put(skb, ie_len);
2412 memcpy(pos, ie, ie_len);
2413 }
2414
2415 return skb;
2416}
2417EXPORT_SYMBOL(ieee80211_probereq_get);
2418
Johannes Berg32bfd352007-12-19 01:31:26 +01002419void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02002420 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02002421 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02002422 struct ieee80211_rts *rts)
2423{
2424 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02002425
Harvey Harrison065e96052008-06-22 16:45:27 -07002426 rts->frame_control =
2427 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01002428 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2429 frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02002430 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2431 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2432}
2433EXPORT_SYMBOL(ieee80211_rts_get);
2434
Johannes Berg32bfd352007-12-19 01:31:26 +01002435void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02002436 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02002437 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02002438 struct ieee80211_cts *cts)
2439{
2440 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02002441
Harvey Harrison065e96052008-06-22 16:45:27 -07002442 cts->frame_control =
2443 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01002444 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2445 frame_len, frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02002446 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2447}
2448EXPORT_SYMBOL(ieee80211_ctstoself_get);
2449
2450struct sk_buff *
Johannes Berg32bfd352007-12-19 01:31:26 +01002451ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
Johannes Berge039fa42008-05-15 12:55:29 +02002452 struct ieee80211_vif *vif)
Johannes Berge2ebc742007-07-27 15:43:22 +02002453{
2454 struct ieee80211_local *local = hw_to_local(hw);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002455 struct sk_buff *skb = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +02002456 struct sta_info *sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002457 struct ieee80211_tx_data tx;
Johannes Berge2ebc742007-07-27 15:43:22 +02002458 struct ieee80211_sub_if_data *sdata;
2459 struct ieee80211_if_ap *bss = NULL;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002460 struct beacon_data *beacon;
Johannes Berge039fa42008-05-15 12:55:29 +02002461 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02002462
Johannes Berg32bfd352007-12-19 01:31:26 +01002463 sdata = vif_to_sdata(vif);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002464 bss = &sdata->u.ap;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002465
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002466 rcu_read_lock();
2467 beacon = rcu_dereference(bss->beacon);
2468
Johannes Berg05c914f2008-09-11 00:01:58 +02002469 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002470 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002471
Johannes Berge2ebc742007-07-27 15:43:22 +02002472 if (bss->dtim_count != 0)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002473 goto out; /* send buffered bc/mc only after DTIM beacon */
Johannes Berge039fa42008-05-15 12:55:29 +02002474
Johannes Berge2ebc742007-07-27 15:43:22 +02002475 while (1) {
2476 skb = skb_dequeue(&bss->ps_bc_buf);
2477 if (!skb)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002478 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02002479 local->total_ps_buffered--;
2480
2481 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2482 struct ieee80211_hdr *hdr =
2483 (struct ieee80211_hdr *) skb->data;
2484 /* more buffered multicast/broadcast frames ==> set
2485 * MoreData flag in IEEE 802.11 header to inform PS
2486 * STAs */
2487 hdr->frame_control |=
2488 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2489 }
2490
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002491 if (!ieee80211_tx_prepare(sdata, &tx, skb))
Johannes Berge2ebc742007-07-27 15:43:22 +02002492 break;
2493 dev_kfree_skb_any(skb);
2494 }
Johannes Berge039fa42008-05-15 12:55:29 +02002495
2496 info = IEEE80211_SKB_CB(skb);
2497
Johannes Berge2ebc742007-07-27 15:43:22 +02002498 sta = tx.sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002499 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2500 tx.channel = local->hw.conf.channel;
Johannes Berge039fa42008-05-15 12:55:29 +02002501 info->band = tx.channel->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02002502
Johannes Berg97b045d2008-06-20 01:22:30 +02002503 if (invoke_tx_handlers(&tx))
Johannes Berge2ebc742007-07-27 15:43:22 +02002504 skb = NULL;
Johannes Berg97b045d2008-06-20 01:22:30 +02002505 out:
Johannes Bergd0709a62008-02-25 16:27:46 +01002506 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002507
2508 return skb;
2509}
2510EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002511
Johannes Berg62ae67b2009-11-18 18:42:05 +01002512void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002513{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002514 skb_set_mac_header(skb, 0);
2515 skb_set_network_header(skb, 0);
2516 skb_set_transport_header(skb, 0);
2517
Johannes Bergcf0277e2010-01-05 18:00:58 +01002518 /* send all internal mgmt frames on VO */
2519 skb_set_queue_mapping(skb, 0);
2520
Johannes Berg3d34deb2009-06-18 17:25:11 +02002521 /*
2522 * The other path calling ieee80211_xmit is from the tasklet,
2523 * and while we can handle concurrent transmissions locking
2524 * requirements are that we do not come into tx with bhs on.
2525 */
2526 local_bh_disable();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002527 ieee80211_xmit(sdata, skb);
Johannes Berg3d34deb2009-06-18 17:25:11 +02002528 local_bh_enable();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002529}