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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 Bergedc6ccb2010-01-17 01:47:55 +0100579ieee80211_tx_h_sta(struct ieee80211_tx_data *tx)
580{
581 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
582
Johannes Berg34e89502010-02-03 13:59:58 +0100583 if (tx->sta && tx->sta->uploaded)
Johannes Bergedc6ccb2010-01-17 01:47:55 +0100584 info->control.sta = &tx->sta->sta;
585
586 return TX_CONTINUE;
587}
588
589static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100590ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200591{
Johannes Berge039fa42008-05-15 12:55:29 +0200592 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200593 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
594 struct ieee80211_supported_band *sband;
595 struct ieee80211_rate *rate;
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700596 int i;
597 u32 len;
Johannes Berge6a98542008-10-21 12:40:02 +0200598 bool inval = false, rts = false, short_preamble = false;
599 struct ieee80211_tx_rate_control txrc;
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700600 u32 sta_flags;
Johannes Berge6a98542008-10-21 12:40:02 +0200601
602 memset(&txrc, 0, sizeof(txrc));
Johannes Berg8318d782008-01-24 19:38:38 +0100603
Johannes Berg2e92e6f2008-05-15 12:55:27 +0200604 sband = tx->local->hw.wiphy->bands[tx->channel->band];
Johannes Berge2ebc742007-07-27 15:43:22 +0200605
Shanyu Zhaoa2c40242010-04-27 11:15:12 -0700606 len = min_t(u32, tx->skb->len + FCS_LEN,
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200607 tx->local->hw.wiphy->frag_threshold);
Johannes Berg58d41852007-09-26 17:53:18 +0200608
Johannes Berge6a98542008-10-21 12:40:02 +0200609 /* set up the tx rate control struct we give the RC algo */
610 txrc.hw = local_to_hw(tx->local);
611 txrc.sband = sband;
612 txrc.bss_conf = &tx->sdata->vif.bss_conf;
613 txrc.skb = tx->skb;
614 txrc.reported_rate.idx = -1;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200615 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
616 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
617 txrc.max_rate_idx = -1;
618 else
619 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Jouni Malinene00cfce2009-12-29 12:59:19 +0200620 txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
Johannes Berg58d41852007-09-26 17:53:18 +0200621
Johannes Berge6a98542008-10-21 12:40:02 +0200622 /* set up RTS protection if desired */
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200623 if (len > tx->local->hw.wiphy->rts_threshold) {
Johannes Berge6a98542008-10-21 12:40:02 +0200624 txrc.rts = rts = true;
Johannes Berge2ebc742007-07-27 15:43:22 +0200625 }
Johannes Berge6a98542008-10-21 12:40:02 +0200626
627 /*
628 * Use short preamble if the BSS can handle it, but not for
629 * management frames unless we know the receiver can handle
630 * that -- the management frame might be to a station that
631 * just wants a probe response.
632 */
633 if (tx->sdata->vif.bss_conf.use_short_preamble &&
634 (ieee80211_is_data(hdr->frame_control) ||
635 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
636 txrc.short_preamble = short_preamble = true;
637
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700638 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
Johannes Berge6a98542008-10-21 12:40:02 +0200639
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700640 /*
641 * Lets not bother rate control if we're associated and cannot
642 * talk to the sta. This should not happen.
643 */
Helmut Schaafbe9c422009-07-23 12:14:04 +0200644 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700645 (sta_flags & WLAN_STA_ASSOC) &&
646 !rate_usable_index_exists(sband, &tx->sta->sta),
647 "%s: Dropped data frame as no usable bitrate found while "
648 "scanning and associated. Target station: "
649 "%pM on %d GHz band\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100650 tx->sdata->name, hdr->addr1,
Luis R. Rodriguezb770b432009-07-16 10:15:09 -0700651 tx->channel->band ? 5 : 2))
652 return TX_DROP;
653
654 /*
655 * If we're associated with the sta at this point we know we can at
656 * least send the frame at the lowest bit rate.
657 */
Johannes Berge6a98542008-10-21 12:40:02 +0200658 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
659
660 if (unlikely(info->control.rates[0].idx < 0))
661 return TX_DROP;
662
663 if (txrc.reported_rate.idx < 0)
664 txrc.reported_rate = info->control.rates[0];
665
666 if (tx->sta)
667 tx->sta->last_tx_rate = txrc.reported_rate;
668
669 if (unlikely(!info->control.rates[0].count))
670 info->control.rates[0].count = 1;
671
Gábor Stefanik99551512009-04-23 19:36:14 +0200672 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
673 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
674 info->control.rates[0].count = 1;
675
Johannes Berge6a98542008-10-21 12:40:02 +0200676 if (is_multicast_ether_addr(hdr->addr1)) {
677 /*
678 * XXX: verify the rate is in the basic rateset
679 */
680 return TX_CONTINUE;
681 }
682
683 /*
684 * set up the RTS/CTS rate as the fastest basic rate
685 * that is not faster than the data rate
686 *
687 * XXX: Should this check all retry rates?
688 */
689 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
690 s8 baserate = 0;
691
692 rate = &sband->bitrates[info->control.rates[0].idx];
693
694 for (i = 0; i < sband->n_bitrates; i++) {
695 /* must be a basic rate */
696 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
697 continue;
698 /* must not be faster than the data rate */
699 if (sband->bitrates[i].bitrate > rate->bitrate)
700 continue;
701 /* maximum */
702 if (sband->bitrates[baserate].bitrate <
703 sband->bitrates[i].bitrate)
704 baserate = i;
705 }
706
707 info->control.rts_cts_rate_idx = baserate;
708 }
709
710 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
711 /*
712 * make sure there's no valid rate following
713 * an invalid one, just in case drivers don't
714 * take the API seriously to stop at -1.
715 */
716 if (inval) {
717 info->control.rates[i].idx = -1;
718 continue;
719 }
720 if (info->control.rates[i].idx < 0) {
721 inval = true;
722 continue;
723 }
724
725 /*
726 * For now assume MCS is already set up correctly, this
727 * needs to be fixed.
728 */
729 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
730 WARN_ON(info->control.rates[i].idx > 76);
731 continue;
732 }
733
734 /* set up RTS protection if desired */
735 if (rts)
736 info->control.rates[i].flags |=
737 IEEE80211_TX_RC_USE_RTS_CTS;
738
739 /* RC is busted */
Sujith075cbc92008-10-23 12:14:02 +0530740 if (WARN_ON_ONCE(info->control.rates[i].idx >=
741 sband->n_bitrates)) {
Johannes Berge6a98542008-10-21 12:40:02 +0200742 info->control.rates[i].idx = -1;
743 continue;
744 }
745
746 rate = &sband->bitrates[info->control.rates[i].idx];
747
748 /* set up short preamble */
749 if (short_preamble &&
750 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
751 info->control.rates[i].flags |=
752 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
753
754 /* set up G protection */
755 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
756 rate->flags & IEEE80211_RATE_ERP_G)
757 info->control.rates[i].flags |=
758 IEEE80211_TX_RC_USE_CTS_PROTECT;
759 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200760
Johannes Berg9ae54c82008-01-31 19:48:20 +0100761 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200762}
763
Johannes Bergd9e8a702008-06-30 15:10:44 +0200764static ieee80211_tx_result debug_noinline
Johannes Bergf591fa52008-07-10 11:21:26 +0200765ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
766{
767 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
768 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
769 u16 *seq;
770 u8 *qc;
771 int tid;
772
Johannes Berg25d834e2008-09-12 22:52:47 +0200773 /*
774 * Packet injection may want to control the sequence
775 * number, if we have no matching interface then we
776 * neither assign one ourselves nor ask the driver to.
777 */
Johannes Berg5061b0c2009-07-14 00:33:34 +0200778 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
Johannes Berg25d834e2008-09-12 22:52:47 +0200779 return TX_CONTINUE;
780
Johannes Bergf591fa52008-07-10 11:21:26 +0200781 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
782 return TX_CONTINUE;
783
784 if (ieee80211_hdrlen(hdr->frame_control) < 24)
785 return TX_CONTINUE;
786
Johannes Berg94778282008-10-10 13:21:59 +0200787 /*
788 * Anything but QoS data that has a sequence number field
789 * (is long enough) gets a sequence number from the global
790 * counter.
791 */
Johannes Bergf591fa52008-07-10 11:21:26 +0200792 if (!ieee80211_is_data_qos(hdr->frame_control)) {
Johannes Berg94778282008-10-10 13:21:59 +0200793 /* driver should assign sequence number */
Johannes Bergf591fa52008-07-10 11:21:26 +0200794 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
Johannes Berg94778282008-10-10 13:21:59 +0200795 /* for pure STA mode without beacons, we can do it */
796 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
797 tx->sdata->sequence_number += 0x10;
Johannes Bergf591fa52008-07-10 11:21:26 +0200798 return TX_CONTINUE;
799 }
800
801 /*
802 * This should be true for injected/management frames only, for
803 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
804 * above since they are not QoS-data frames.
805 */
806 if (!tx->sta)
807 return TX_CONTINUE;
808
809 /* include per-STA, per-TID sequence counter */
810
811 qc = ieee80211_get_qos_ctl(hdr);
812 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
813 seq = &tx->sta->tid_seq[tid];
814
815 hdr->seq_ctrl = cpu_to_le16(*seq);
816
817 /* Increase the sequence number. */
818 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
819
820 return TX_CONTINUE;
821}
822
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100823static int ieee80211_fragment(struct ieee80211_local *local,
824 struct sk_buff *skb, int hdrlen,
825 int frag_threshold)
826{
827 struct sk_buff *tail = skb, *tmp;
828 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
829 int pos = hdrlen + per_fragm;
830 int rem = skb->len - hdrlen - per_fragm;
831
832 if (WARN_ON(rem < 0))
833 return -EINVAL;
834
835 while (rem) {
836 int fraglen = per_fragm;
837
838 if (fraglen > rem)
839 fraglen = rem;
840 rem -= fraglen;
841 tmp = dev_alloc_skb(local->tx_headroom +
842 frag_threshold +
843 IEEE80211_ENCRYPT_HEADROOM +
844 IEEE80211_ENCRYPT_TAILROOM);
845 if (!tmp)
846 return -ENOMEM;
847 tail->next = tmp;
848 tail = tmp;
849 skb_reserve(tmp, local->tx_headroom +
850 IEEE80211_ENCRYPT_HEADROOM);
851 /* copy control information */
852 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
853 skb_copy_queue_mapping(tmp, skb);
854 tmp->priority = skb->priority;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100855 tmp->dev = skb->dev;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100856
857 /* copy header and data */
858 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
859 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
860
861 pos += fraglen;
862 }
863
864 skb->len = hdrlen + per_fragm;
865 return 0;
866}
867
Johannes Bergf591fa52008-07-10 11:21:26 +0200868static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200869ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
870{
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100871 struct sk_buff *skb = tx->skb;
872 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
873 struct ieee80211_hdr *hdr = (void *)skb->data;
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +0200874 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100875 int hdrlen;
876 int fragnum;
Johannes Berge2454942008-05-15 12:55:28 +0200877
878 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
879 return TX_CONTINUE;
880
Johannes Bergeefce912008-05-17 00:57:13 +0200881 /*
882 * Warn when submitting a fragmented A-MPDU frame and drop it.
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200883 * This scenario is handled in ieee80211_tx_prepare but extra
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +0300884 * caution taken here as fragmented ampdu may cause Tx stop.
Johannes Bergeefce912008-05-17 00:57:13 +0200885 */
Sujith8b30b1f2008-10-24 09:55:27 +0530886 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Bergeefce912008-05-17 00:57:13 +0200887 return TX_DROP;
888
Harvey Harrison065e96052008-06-22 16:45:27 -0700889 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2454942008-05-15 12:55:28 +0200890
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100891 /* internal error, why is TX_FRAGMENTED set? */
Johannes Berg8ccd8f22009-04-29 23:35:56 +0200892 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100893 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200894
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100895 /*
896 * Now fragment the frame. This will allocate all the fragments and
897 * chain them (using skb as the first fragment) to skb->next.
898 * During transmission, we will remove the successfully transmitted
899 * fragments from this list. When the low-level driver rejects one
900 * of the fragments then we will simply pretend to accept the skb
901 * but store it away as pending.
902 */
903 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
904 return TX_DROP;
Johannes Berge2454942008-05-15 12:55:28 +0200905
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100906 /* update duration/seq/flags of fragments */
907 fragnum = 0;
908 do {
909 int next_len;
910 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
Johannes Berge2454942008-05-15 12:55:28 +0200911
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100912 hdr = (void *)skb->data;
913 info = IEEE80211_SKB_CB(skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200914
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100915 if (skb->next) {
916 hdr->frame_control |= morefrags;
917 next_len = skb->next->len;
Johannes Berge6a98542008-10-21 12:40:02 +0200918 /*
919 * No multi-rate retries for fragmented frames, that
920 * would completely throw off the NAV at other STAs.
921 */
922 info->control.rates[1].idx = -1;
923 info->control.rates[2].idx = -1;
924 info->control.rates[3].idx = -1;
925 info->control.rates[4].idx = -1;
926 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
927 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100928 } else {
929 hdr->frame_control &= ~morefrags;
930 next_len = 0;
Johannes Berge6a98542008-10-21 12:40:02 +0200931 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100932 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
933 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
934 fragnum++;
935 } while ((skb = skb->next));
Johannes Berge2454942008-05-15 12:55:28 +0200936
937 return TX_CONTINUE;
Johannes Berge2454942008-05-15 12:55:28 +0200938}
939
Johannes Bergd9e8a702008-06-30 15:10:44 +0200940static ieee80211_tx_result debug_noinline
Johannes Bergfeff1f22009-08-10 16:01:54 +0200941ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
942{
943 struct sk_buff *skb = tx->skb;
944
945 if (!tx->sta)
946 return TX_CONTINUE;
947
948 tx->sta->tx_packets++;
949 do {
950 tx->sta->tx_fragments++;
951 tx->sta->tx_bytes += skb->len;
952 } while ((skb = skb->next));
953
954 return TX_CONTINUE;
955}
956
957static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200958ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
959{
960 if (!tx->key)
961 return TX_CONTINUE;
962
963 switch (tx->key->conf.alg) {
964 case ALG_WEP:
965 return ieee80211_crypto_wep_encrypt(tx);
966 case ALG_TKIP:
967 return ieee80211_crypto_tkip_encrypt(tx);
968 case ALG_CCMP:
969 return ieee80211_crypto_ccmp_encrypt(tx);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200970 case ALG_AES_CMAC:
971 return ieee80211_crypto_aes_cmac_encrypt(tx);
Johannes Berge2454942008-05-15 12:55:28 +0200972 }
973
974 /* not reached */
975 WARN_ON(1);
976 return TX_DROP;
977}
978
Johannes Bergd9e8a702008-06-30 15:10:44 +0200979static ieee80211_tx_result debug_noinline
Johannes Berg03f93c32008-06-25 14:36:27 +0300980ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
981{
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100982 struct sk_buff *skb = tx->skb;
983 struct ieee80211_hdr *hdr;
984 int next_len;
985 bool group_addr;
Johannes Berg03f93c32008-06-25 14:36:27 +0300986
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100987 do {
988 hdr = (void *) skb->data;
Jouni Malinen7e0aae42009-05-19 19:25:58 +0300989 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
990 break; /* must not overwrite AID */
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100991 next_len = skb->next ? skb->next->len : 0;
992 group_addr = is_multicast_ether_addr(hdr->addr1);
Johannes Berg03f93c32008-06-25 14:36:27 +0300993
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100994 hdr->duration_id =
995 ieee80211_duration(tx, group_addr, next_len);
996 } while ((skb = skb->next));
Johannes Berg03f93c32008-06-25 14:36:27 +0300997
998 return TX_CONTINUE;
999}
1000
Johannes Berge2ebc742007-07-27 15:43:22 +02001001/* actual transmit path */
1002
1003/*
1004 * deal with packet injection down monitor interface
1005 * with Radiotap Header -- only called for monitor mode interface
1006 */
Johannes Berg27004b12009-06-09 19:48:25 +02001007static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
1008 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001009{
1010 /*
1011 * this is the moment to interpret and discard the radiotap header that
1012 * must be at the start of the packet injected in Monitor mode
1013 *
1014 * Need to take some care with endian-ness since radiotap
1015 * args are little-endian
1016 */
1017
1018 struct ieee80211_radiotap_iterator iterator;
1019 struct ieee80211_radiotap_header *rthdr =
1020 (struct ieee80211_radiotap_header *) skb->data;
Johannes Berg8318d782008-01-24 19:38:38 +01001021 struct ieee80211_supported_band *sband;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001022 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001023 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1024 NULL);
Johannes Berge2ebc742007-07-27 15:43:22 +02001025
Johannes Berg2e92e6f2008-05-15 12:55:27 +02001026 sband = tx->local->hw.wiphy->bands[tx->channel->band];
Johannes Berg8318d782008-01-24 19:38:38 +01001027
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001028 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001029 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +02001030
1031 /*
1032 * for every radiotap entry that is present
1033 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1034 * entries present, or -EINVAL on error)
1035 */
1036
1037 while (!ret) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001038 ret = ieee80211_radiotap_iterator_next(&iterator);
1039
1040 if (ret)
1041 continue;
1042
1043 /* see if this argument is something we can use */
1044 switch (iterator.this_arg_index) {
1045 /*
1046 * You must take care when dereferencing iterator.this_arg
1047 * for multibyte types... the pointer is not aligned. Use
1048 * get_unaligned((type *)iterator.this_arg) to dereference
1049 * iterator.this_arg for type "type" safely on all arches.
1050 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001051 case IEEE80211_RADIOTAP_FLAGS:
1052 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1053 /*
1054 * this indicates that the skb we have been
1055 * handed has the 32-bit FCS CRC at the end...
1056 * we should react to that by snipping it off
1057 * because it will be recomputed and added
1058 * on transmission
1059 */
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001060 if (skb->len < (iterator._max_length + FCS_LEN))
Johannes Berg27004b12009-06-09 19:48:25 +02001061 return false;
Johannes Berge2ebc742007-07-27 15:43:22 +02001062
1063 skb_trim(skb, skb->len - FCS_LEN);
1064 }
Johannes Berg58d41852007-09-26 17:53:18 +02001065 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001066 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
Johannes Berg58d41852007-09-26 17:53:18 +02001067 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
Johannes Berg5cf121c2008-02-25 16:27:43 +01001068 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +02001069 break;
1070
Johannes Berg58d41852007-09-26 17:53:18 +02001071 /*
1072 * Please update the file
1073 * Documentation/networking/mac80211-injection.txt
1074 * when parsing new fields here.
1075 */
1076
Johannes Berge2ebc742007-07-27 15:43:22 +02001077 default:
1078 break;
1079 }
1080 }
1081
1082 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
Johannes Berg27004b12009-06-09 19:48:25 +02001083 return false;
Johannes Berge2ebc742007-07-27 15:43:22 +02001084
1085 /*
1086 * remove the radiotap header
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001087 * iterator->_max_length was sanity-checked against
Johannes Berge2ebc742007-07-27 15:43:22 +02001088 * skb->len by iterator init
1089 */
Johannes Berg33e5a2f2010-02-03 10:24:30 +01001090 skb_pull(skb, iterator._max_length);
Johannes Berge2ebc742007-07-27 15:43:22 +02001091
Johannes Berg27004b12009-06-09 19:48:25 +02001092 return true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001093}
1094
Johannes Berg58d41852007-09-26 17:53:18 +02001095/*
1096 * initialises @tx
1097 */
Johannes Berg9ae54c82008-01-31 19:48:20 +01001098static ieee80211_tx_result
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001099ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1100 struct ieee80211_tx_data *tx,
1101 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001102{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001103 struct ieee80211_local *local = sdata->local;
Johannes Berg58d41852007-09-26 17:53:18 +02001104 struct ieee80211_hdr *hdr;
Johannes Berge039fa42008-05-15 12:55:29 +02001105 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Sujith8b30b1f2008-10-24 09:55:27 +05301106 int hdrlen, tid;
1107 u8 *qc, *state;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001108 bool queued = false;
Johannes Berge2ebc742007-07-27 15:43:22 +02001109
1110 memset(tx, 0, sizeof(*tx));
1111 tx->skb = skb;
Johannes Berge2ebc742007-07-27 15:43:22 +02001112 tx->local = local;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001113 tx->sdata = sdata;
Johannes Berge039fa42008-05-15 12:55:29 +02001114 tx->channel = local->hw.conf.channel;
Johannes Berge2ebc742007-07-27 15:43:22 +02001115 /*
Johannes Berg58d41852007-09-26 17:53:18 +02001116 * Set this flag (used below to indicate "automatic fragmentation"),
1117 * it will be cleared/left by radiotap as desired.
Johannes Berge2ebc742007-07-27 15:43:22 +02001118 */
Johannes Berg5cf121c2008-02-25 16:27:43 +01001119 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +02001120
1121 /* process and remove the injection radiotap header */
Felix Fietkau17ad3532010-01-31 21:56:25 +01001122 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
Johannes Berg27004b12009-06-09 19:48:25 +02001123 if (!__ieee80211_parse_tx_radiotap(tx, skb))
Johannes Berg9ae54c82008-01-31 19:48:20 +01001124 return TX_DROP;
Johannes Berg58d41852007-09-26 17:53:18 +02001125
Johannes Berge2ebc742007-07-27 15:43:22 +02001126 /*
Johannes Berg58d41852007-09-26 17:53:18 +02001127 * __ieee80211_parse_tx_radiotap has now removed
1128 * the radiotap header that was present and pre-filled
1129 * 'tx' with tx control information.
Johannes Berge2ebc742007-07-27 15:43:22 +02001130 */
Felix Fietkau17ad3532010-01-31 21:56:25 +01001131 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
Johannes Berge2ebc742007-07-27 15:43:22 +02001132 }
1133
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001134 /*
1135 * If this flag is set to true anywhere, and we get here,
1136 * we are doing the needed processing, so remove the flag
1137 * now.
1138 */
1139 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1140
Johannes Berg58d41852007-09-26 17:53:18 +02001141 hdr = (struct ieee80211_hdr *) skb->data;
1142
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001143 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001144 tx->sta = rcu_dereference(sdata->u.vlan.sta);
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001145 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1146 return TX_DROP;
Felix Fietkaub4d57ad2010-01-31 23:25:24 +01001147 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1148 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
Felix Fietkau3f0e0b22010-01-08 18:15:13 +01001149 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001150 if (!tx->sta)
Johannes Bergabe60632009-11-25 17:46:18 +01001151 tx->sta = sta_info_get(sdata, hdr->addr1);
Johannes Berg58d41852007-09-26 17:53:18 +02001152
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001153 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1154 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001155 struct tid_ampdu_tx *tid_tx;
1156
Sujith8b30b1f2008-10-24 09:55:27 +05301157 qc = ieee80211_get_qos_ctl(hdr);
1158 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1159
Johannes Berg2b43ae62010-04-06 11:18:44 +02001160 spin_lock(&tx->sta->lock);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001161 /*
1162 * XXX: This spinlock could be fairly expensive, but see the
1163 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1164 * One way to solve this would be to do something RCU-like
1165 * for managing the tid_tx struct and using atomic bitops
1166 * for the actual state -- by introducing an actual
1167 * 'operational' bit that would be possible. It would
1168 * require changing ieee80211_agg_tx_operational() to
1169 * set that bit, and changing the way tid_tx is managed
1170 * everywhere, including races between that bit and
1171 * tid_tx going away (tid_tx being added can be easily
1172 * committed to memory before the 'operational' bit).
1173 */
1174 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
Sujith8b30b1f2008-10-24 09:55:27 +05301175 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001176 if (*state == HT_AGG_STATE_OPERATIONAL) {
Sujith8b30b1f2008-10-24 09:55:27 +05301177 info->flags |= IEEE80211_TX_CTL_AMPDU;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001178 } else if (*state != HT_AGG_STATE_IDLE) {
1179 /* in progress */
1180 queued = true;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001181 info->control.vif = &sdata->vif;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001182 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1183 __skb_queue_tail(&tid_tx->pending, skb);
1184 }
Johannes Berg2b43ae62010-04-06 11:18:44 +02001185 spin_unlock(&tx->sta->lock);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001186
1187 if (unlikely(queued))
1188 return TX_QUEUED;
Sujith8b30b1f2008-10-24 09:55:27 +05301189 }
1190
Jiri Slabybadffb72007-08-28 17:01:54 -04001191 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001192 tx->flags &= ~IEEE80211_TX_UNICAST;
Johannes Berge039fa42008-05-15 12:55:29 +02001193 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -04001194 } else {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001195 tx->flags |= IEEE80211_TX_UNICAST;
Johannes Bergd3707d92009-05-12 22:05:40 +02001196 if (unlikely(local->wifi_wme_noack_test))
1197 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1198 else
1199 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -04001200 }
Johannes Berg58d41852007-09-26 17:53:18 +02001201
Johannes Berg5cf121c2008-02-25 16:27:43 +01001202 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1203 if ((tx->flags & IEEE80211_TX_UNICAST) &&
Jouni Malinenb9a5f8ca2009-04-20 18:39:05 +02001204 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +03001205 !(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001206 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berg58d41852007-09-26 17:53:18 +02001207 else
Johannes Berg5cf121c2008-02-25 16:27:43 +01001208 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
Johannes Berg58d41852007-09-26 17:53:18 +02001209 }
1210
Johannes Berge2ebc742007-07-27 15:43:22 +02001211 if (!tx->sta)
Johannes Berge039fa42008-05-15 12:55:29 +02001212 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Berg07346f812008-05-03 01:02:02 +02001213 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
Johannes Berge039fa42008-05-15 12:55:29 +02001214 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Berg58d41852007-09-26 17:53:18 +02001215
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001216 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2ebc742007-07-27 15:43:22 +02001217 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1218 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1219 tx->ethertype = (pos[0] << 8) | pos[1];
1220 }
Johannes Berge039fa42008-05-15 12:55:29 +02001221 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge2ebc742007-07-27 15:43:22 +02001222
Johannes Berg9ae54c82008-01-31 19:48:20 +01001223 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +02001224}
1225
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001226static int __ieee80211_tx(struct ieee80211_local *local,
Johannes Berg1870cd72009-03-23 17:28:38 +01001227 struct sk_buff **skbp,
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001228 struct sta_info *sta,
1229 bool txpending)
Johannes Berge2ebc742007-07-27 15:43:22 +02001230{
Johannes Berg1870cd72009-03-23 17:28:38 +01001231 struct sk_buff *skb = *skbp, *next;
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001232 struct ieee80211_tx_info *info;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001233 struct ieee80211_sub_if_data *sdata;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001234 unsigned long flags;
Johannes Berga2208582009-03-23 17:28:40 +01001235 int ret, len;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001236 bool fragm = false;
Johannes Berge2ebc742007-07-27 15:43:22 +02001237
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001238 while (skb) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001239 int q = skb_get_queue_mapping(skb);
1240
1241 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1242 ret = IEEE80211_TX_OK;
1243 if (local->queue_stop_reasons[q] ||
1244 (!txpending && !skb_queue_empty(&local->pending[q])))
1245 ret = IEEE80211_TX_PENDING;
1246 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1247 if (ret != IEEE80211_TX_OK)
1248 return ret;
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001249
Johannes Bergf0e72852009-03-23 17:28:36 +01001250 info = IEEE80211_SKB_CB(skb);
1251
1252 if (fragm)
Johannes Berge6a98542008-10-21 12:40:02 +02001253 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
Johannes Berge039fa42008-05-15 12:55:29 +02001254 IEEE80211_TX_CTL_FIRST_FRAGMENT);
Johannes Bergf0e72852009-03-23 17:28:36 +01001255
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001256 next = skb->next;
Johannes Berga2208582009-03-23 17:28:40 +01001257 len = skb->len;
Johannes Berg5061b0c2009-07-14 00:33:34 +02001258
Johannes Bergad5351d2009-08-07 16:42:15 +02001259 if (next)
1260 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1261
Johannes Berg5061b0c2009-07-14 00:33:34 +02001262 sdata = vif_to_sdata(info->control.vif);
1263
1264 switch (sdata->vif.type) {
1265 case NL80211_IFTYPE_MONITOR:
1266 info->control.vif = NULL;
1267 break;
1268 case NL80211_IFTYPE_AP_VLAN:
1269 info->control.vif = &container_of(sdata->bss,
1270 struct ieee80211_sub_if_data, u.ap)->vif;
1271 break;
1272 default:
1273 /* keep */
1274 break;
1275 }
1276
Johannes Berg24487982009-04-23 18:52:52 +02001277 ret = drv_tx(local, skb);
Johannes Berga2208582009-03-23 17:28:40 +01001278 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1279 dev_kfree_skb(skb);
1280 ret = NETDEV_TX_OK;
1281 }
Luis R. Rodriguez21f5fc72009-07-24 19:57:25 -04001282 if (ret != NETDEV_TX_OK) {
1283 info->control.vif = &sdata->vif;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001284 return IEEE80211_TX_AGAIN;
Luis R. Rodriguez21f5fc72009-07-24 19:57:25 -04001285 }
1286
Johannes Berg1870cd72009-03-23 17:28:38 +01001287 *skbp = skb = next;
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001288 ieee80211_led_tx(local, 1);
1289 fragm = true;
Johannes Berge2ebc742007-07-27 15:43:22 +02001290 }
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001291
Johannes Berge2ebc742007-07-27 15:43:22 +02001292 return IEEE80211_TX_OK;
1293}
1294
Johannes Berg97b045d2008-06-20 01:22:30 +02001295/*
1296 * Invoke TX handlers, return 0 on success and non-zero if the
1297 * frame was dropped or queued.
1298 */
1299static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1300{
Johannes Berg97b045d2008-06-20 01:22:30 +02001301 struct sk_buff *skb = tx->skb;
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001302 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg97b045d2008-06-20 01:22:30 +02001303 ieee80211_tx_result res = TX_DROP;
Johannes Berg97b045d2008-06-20 01:22:30 +02001304
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001305#define CALL_TXH(txh) \
1306 do { \
1307 res = txh(tx); \
1308 if (res != TX_CONTINUE) \
1309 goto txh_done; \
1310 } while (0)
Johannes Berg97b045d2008-06-20 01:22:30 +02001311
Kalle Valo5c1b98a2010-01-12 10:42:46 +02001312 CALL_TXH(ieee80211_tx_h_dynamic_ps);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001313 CALL_TXH(ieee80211_tx_h_check_assoc);
1314 CALL_TXH(ieee80211_tx_h_ps_buf);
1315 CALL_TXH(ieee80211_tx_h_select_key);
Johannes Bergedc6ccb2010-01-17 01:47:55 +01001316 CALL_TXH(ieee80211_tx_h_sta);
Johannes Bergaf65cd962009-11-17 18:18:36 +01001317 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1318 CALL_TXH(ieee80211_tx_h_rate_ctrl);
Johannes Bergc6fcf6b2010-01-17 01:47:59 +01001319
1320 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1321 goto txh_done;
1322
1323 CALL_TXH(ieee80211_tx_h_michael_mic_add);
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001324 CALL_TXH(ieee80211_tx_h_sequence);
1325 CALL_TXH(ieee80211_tx_h_fragment);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001326 /* handlers after fragment must be aware of tx info fragmentation! */
Johannes Berg9aa4aee2009-10-29 08:43:48 +01001327 CALL_TXH(ieee80211_tx_h_stats);
1328 CALL_TXH(ieee80211_tx_h_encrypt);
1329 CALL_TXH(ieee80211_tx_h_calculate_duration);
Johannes Bergd9e8a702008-06-30 15:10:44 +02001330#undef CALL_TXH
1331
1332 txh_done:
Johannes Berg97b045d2008-06-20 01:22:30 +02001333 if (unlikely(res == TX_DROP)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001334 I802_DEBUG_INC(tx->local->tx_handlers_drop);
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001335 while (skb) {
1336 struct sk_buff *next;
1337
1338 next = skb->next;
1339 dev_kfree_skb(skb);
1340 skb = next;
1341 }
Johannes Berg97b045d2008-06-20 01:22:30 +02001342 return -1;
1343 } else if (unlikely(res == TX_QUEUED)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001344 I802_DEBUG_INC(tx->local->tx_handlers_queued);
Johannes Berg97b045d2008-06-20 01:22:30 +02001345 return -1;
1346 }
1347
1348 return 0;
1349}
1350
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001351static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1352 struct sk_buff *skb, bool txpending)
Johannes Berge2ebc742007-07-27 15:43:22 +02001353{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001354 struct ieee80211_local *local = sdata->local;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001355 struct ieee80211_tx_data tx;
Johannes Berg97b045d2008-06-20 01:22:30 +02001356 ieee80211_tx_result res_prepare;
Johannes Berge039fa42008-05-15 12:55:29 +02001357 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg2a577d92009-03-23 17:28:37 +01001358 struct sk_buff *next;
1359 unsigned long flags;
1360 int ret, retries;
Johannes Berge2530082008-05-17 00:57:14 +02001361 u16 queue;
Johannes Berge2ebc742007-07-27 15:43:22 +02001362
Johannes Berge2530082008-05-17 00:57:14 +02001363 queue = skb_get_queue_mapping(skb);
1364
Johannes Berge2ebc742007-07-27 15:43:22 +02001365 if (unlikely(skb->len < 10)) {
1366 dev_kfree_skb(skb);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001367 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001368 }
1369
Johannes Bergd0709a62008-02-25 16:27:46 +01001370 rcu_read_lock();
1371
Johannes Berg58d41852007-09-26 17:53:18 +02001372 /* initialises tx */
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001373 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001374
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001375 if (unlikely(res_prepare == TX_DROP)) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001376 dev_kfree_skb(skb);
Johannes Bergd0709a62008-02-25 16:27:46 +01001377 rcu_read_unlock();
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001378 return;
1379 } else if (unlikely(res_prepare == TX_QUEUED)) {
1380 rcu_read_unlock();
1381 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001382 }
1383
Johannes Berg5cf121c2008-02-25 16:27:43 +01001384 tx.channel = local->hw.conf.channel;
Johannes Berge039fa42008-05-15 12:55:29 +02001385 info->band = tx.channel->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02001386
Johannes Berg97b045d2008-06-20 01:22:30 +02001387 if (invoke_tx_handlers(&tx))
1388 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02001389
Johannes Berg2a577d92009-03-23 17:28:37 +01001390 retries = 0;
1391 retry:
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001392 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
Johannes Berg2a577d92009-03-23 17:28:37 +01001393 switch (ret) {
1394 case IEEE80211_TX_OK:
1395 break;
1396 case IEEE80211_TX_AGAIN:
Johannes Bergeefce912008-05-17 00:57:13 +02001397 /*
1398 * Since there are no fragmented frames on A-MPDU
1399 * queues, there's no reason for a driver to reject
1400 * a frame there, warn and drop it.
1401 */
Johannes Berg2a577d92009-03-23 17:28:37 +01001402 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1403 goto drop;
1404 /* fall through */
1405 case IEEE80211_TX_PENDING:
1406 skb = tx.skb;
1407
1408 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1409
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001410 if (local->queue_stop_reasons[queue] ||
1411 !skb_queue_empty(&local->pending[queue])) {
1412 /*
1413 * if queue is stopped, queue up frames for later
1414 * transmission from the tasklet
1415 */
Johannes Berg2a577d92009-03-23 17:28:37 +01001416 do {
1417 next = skb->next;
1418 skb->next = NULL;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001419 if (unlikely(txpending))
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001420 __skb_queue_head(&local->pending[queue],
1421 skb);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001422 else
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001423 __skb_queue_tail(&local->pending[queue],
1424 skb);
Johannes Berg2a577d92009-03-23 17:28:37 +01001425 } while ((skb = next));
1426
Johannes Berg2a577d92009-03-23 17:28:37 +01001427 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1428 flags);
1429 } else {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001430 /*
1431 * otherwise retry, but this is a race condition or
1432 * a driver bug (which we warn about if it persists)
1433 */
Johannes Berg2a577d92009-03-23 17:28:37 +01001434 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1435 flags);
1436
1437 retries++;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001438 if (WARN(retries > 10, "tx refused but queue active\n"))
Vivek Natarajan97d97b82009-02-05 20:05:15 +05301439 goto drop;
Johannes Berge2ebc742007-07-27 15:43:22 +02001440 goto retry;
1441 }
Johannes Berge2ebc742007-07-27 15:43:22 +02001442 }
Johannes Berg97b045d2008-06-20 01:22:30 +02001443 out:
Johannes Bergd4e46a32007-09-14 11:10:24 -04001444 rcu_read_unlock();
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001445 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001446
1447 drop:
Johannes Bergd4e46a32007-09-14 11:10:24 -04001448 rcu_read_unlock();
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001449
1450 skb = tx.skb;
1451 while (skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001452 next = skb->next;
1453 dev_kfree_skb(skb);
1454 skb = next;
1455 }
Johannes Berge2ebc742007-07-27 15:43:22 +02001456}
1457
1458/* device xmit handlers */
1459
Johannes Berg23c07522008-05-29 10:38:53 +02001460static int ieee80211_skb_resize(struct ieee80211_local *local,
1461 struct sk_buff *skb,
1462 int head_need, bool may_encrypt)
1463{
1464 int tail_need = 0;
1465
1466 /*
1467 * This could be optimised, devices that do full hardware
1468 * crypto (including TKIP MMIC) need no tailroom... But we
1469 * have no drivers for such devices currently.
1470 */
1471 if (may_encrypt) {
1472 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1473 tail_need -= skb_tailroom(skb);
1474 tail_need = max_t(int, tail_need, 0);
1475 }
1476
1477 if (head_need || tail_need) {
1478 /* Sorry. Can't account for this any more */
1479 skb_orphan(skb);
1480 }
1481
1482 if (skb_header_cloned(skb))
1483 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1484 else
1485 I802_DEBUG_INC(local->tx_expand_skb_head);
1486
1487 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1488 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1489 wiphy_name(local->hw.wiphy));
1490 return -ENOMEM;
1491 }
1492
1493 /* update truesize too */
1494 skb->truesize += head_need + tail_need;
1495
1496 return 0;
1497}
1498
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001499static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1500 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001501{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001502 struct ieee80211_local *local = sdata->local;
Johannes Berge039fa42008-05-15 12:55:29 +02001503 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001505 struct ieee80211_sub_if_data *tmp_sdata;
Johannes Berge2ebc742007-07-27 15:43:22 +02001506 int headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001507 bool may_encrypt;
Johannes Berge2ebc742007-07-27 15:43:22 +02001508
Johannes Bergd84f3232009-11-16 23:20:41 +01001509 rcu_read_lock();
1510
Javier Cardonacca89492009-08-10 17:29:29 -07001511 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
Johannes Berg25d834e2008-09-12 22:52:47 +02001512 int hdrlen;
1513 u16 len_rthdr;
1514
Felix Fietkau17ad3532010-01-31 21:56:25 +01001515 info->flags |= IEEE80211_TX_CTL_INJECTED |
1516 IEEE80211_TX_INTFL_HAS_RADIOTAP;
Johannes Berg25d834e2008-09-12 22:52:47 +02001517
1518 len_rthdr = ieee80211_get_radiotap_len(skb->data);
Pavel Roskin8ef86c72009-07-10 16:42:29 -04001519 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
Johannes Berg25d834e2008-09-12 22:52:47 +02001520 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1521
1522 /* check the header is complete in the frame */
1523 if (likely(skb->len >= len_rthdr + hdrlen)) {
1524 /*
1525 * We process outgoing injected frames that have a
1526 * local address we handle as though they are our
1527 * own frames.
1528 * This code here isn't entirely correct, the local
1529 * MAC address is not necessarily enough to find
1530 * the interface to use; for that proper VLAN/WDS
1531 * support we will need a different mechanism.
1532 */
1533
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001534 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
Johannes Berg25d834e2008-09-12 22:52:47 +02001535 list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01001536 if (!ieee80211_sdata_running(tmp_sdata))
Johannes Berg25d834e2008-09-12 22:52:47 +02001537 continue;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001538 if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Bergf1b33cb2009-02-06 00:27:32 +01001539 continue;
Johannes Berg47846c92009-11-25 17:46:19 +01001540 if (compare_ether_addr(tmp_sdata->vif.addr,
Björn Smedman9b1ce522009-10-24 20:55:09 +02001541 hdr->addr2) == 0) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001542 sdata = tmp_sdata;
Johannes Berg25d834e2008-09-12 22:52:47 +02001543 break;
1544 }
1545 }
Johannes Berg25d834e2008-09-12 22:52:47 +02001546 }
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001547 }
1548
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001549 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
Johannes Berg23c07522008-05-29 10:38:53 +02001550
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001551 headroom = local->tx_headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001552 if (may_encrypt)
1553 headroom += IEEE80211_ENCRYPT_HEADROOM;
1554 headroom -= skb_headroom(skb);
1555 headroom = max_t(int, 0, headroom);
1556
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001557 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
Johannes Berg23c07522008-05-29 10:38:53 +02001558 dev_kfree_skb(skb);
Johannes Bergd84f3232009-11-16 23:20:41 +01001559 rcu_read_unlock();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001560 return;
Johannes Berge2ebc742007-07-27 15:43:22 +02001561 }
1562
Johannes Berg5061b0c2009-07-14 00:33:34 +02001563 info->control.vif = &sdata->vif;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001564
Javier Cardonacca89492009-08-10 17:29:29 -07001565 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1566 ieee80211_is_data(hdr->frame_control) &&
1567 !is_multicast_ether_addr(hdr->addr1))
1568 if (mesh_nexthop_lookup(skb, sdata)) {
1569 /* skb queued: don't free */
Johannes Bergd84f3232009-11-16 23:20:41 +01001570 rcu_read_unlock();
Javier Cardonacca89492009-08-10 17:29:29 -07001571 return;
1572 }
1573
Johannes Bergcf0277e2010-01-05 18:00:58 +01001574 ieee80211_set_qos_hdr(local, skb);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001575 ieee80211_tx(sdata, skb, false);
Johannes Bergd84f3232009-11-16 23:20:41 +01001576 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001577}
1578
Stephen Hemmingerd0cf9c02009-08-31 19:50:57 +00001579netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1580 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02001581{
1582 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
Luis R. Rodriguez47f4d882009-01-30 09:08:29 -08001583 struct ieee80211_channel *chan = local->hw.conf.channel;
Johannes Berge2ebc742007-07-27 15:43:22 +02001584 struct ieee80211_radiotap_header *prthdr =
1585 (struct ieee80211_radiotap_header *)skb->data;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001586 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Andy Green9b8a74e2007-07-27 15:43:24 +02001587 u16 len_rthdr;
Johannes Berge2ebc742007-07-27 15:43:22 +02001588
Luis R. Rodriguez47f4d882009-01-30 09:08:29 -08001589 /*
1590 * Frame injection is not allowed if beaconing is not allowed
1591 * or if we need radar detection. Beaconing is usually not allowed when
1592 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1593 * Passive scan is also used in world regulatory domains where
1594 * your country is not known and as such it should be treated as
1595 * NO TX unless the channel is explicitly allowed in which case
1596 * your current regulatory domain would not have the passive scan
1597 * flag.
1598 *
1599 * Since AP mode uses monitor interfaces to inject/TX management
1600 * frames we can make AP mode the exception to this rule once it
1601 * supports radar detection as its implementation can deal with
1602 * radar detection by itself. We can do that later by adding a
1603 * monitor flag interfaces used for AP support.
1604 */
1605 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1606 IEEE80211_CHAN_PASSIVE_SCAN)))
1607 goto fail;
1608
Andy Green9b8a74e2007-07-27 15:43:24 +02001609 /* check for not even having the fixed radiotap header part */
1610 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1611 goto fail; /* too short to be possibly valid */
1612
1613 /* is it a header version we can trust to find length from? */
1614 if (unlikely(prthdr->it_version))
1615 goto fail; /* only version 0 is supported */
1616
1617 /* then there must be a radiotap header with a length we can use */
1618 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1619
1620 /* does the skb contain enough to deliver on the alleged length? */
1621 if (unlikely(skb->len < len_rthdr))
1622 goto fail; /* skb too short for claimed rt header extent */
Johannes Berge2ebc742007-07-27 15:43:22 +02001623
Johannes Berge2ebc742007-07-27 15:43:22 +02001624 /*
1625 * fix up the pointers accounting for the radiotap
1626 * header still being in there. We are being given
1627 * a precooked IEEE80211 header so no need for
1628 * normal processing
1629 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001630 skb_set_mac_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001631 /*
Andy Green9b8a74e2007-07-27 15:43:24 +02001632 * these are just fixed to the end of the rt area since we
1633 * don't have any better information and at this point, nobody cares
Johannes Berge2ebc742007-07-27 15:43:22 +02001634 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001635 skb_set_network_header(skb, len_rthdr);
1636 skb_set_transport_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001637
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001638 memset(info, 0, sizeof(*info));
1639
Johannes Berg7351c6b2009-11-19 01:08:30 +01001640 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1641
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001642 /* pass the radiotap header up to xmit */
1643 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001644 return NETDEV_TX_OK;
Andy Green9b8a74e2007-07-27 15:43:24 +02001645
1646fail:
1647 dev_kfree_skb(skb);
1648 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
Johannes Berge2ebc742007-07-27 15:43:22 +02001649}
1650
1651/**
1652 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1653 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1654 * @skb: packet to be sent
1655 * @dev: incoming interface
1656 *
1657 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1658 * not be freed, and caller is responsible for either retrying later or freeing
1659 * skb).
1660 *
1661 * This function takes in an Ethernet header and encapsulates it with suitable
1662 * IEEE 802.11 header based on which interface the packet is coming in. The
1663 * encapsulated packet will then be passed to master interface, wlan#.11, for
1664 * transmission (through low-level driver).
1665 */
Stephen Hemmingerd0cf9c02009-08-31 19:50:57 +00001666netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1667 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02001668{
Johannes Berg133b8222008-09-16 14:18:59 +02001669 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1670 struct ieee80211_local *local = sdata->local;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001671 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Patrick McHardy5b548142009-06-12 06:22:29 +00001672 int ret = NETDEV_TX_BUSY, head_need;
Harvey Harrison065e96052008-06-22 16:45:27 -07001673 u16 ethertype, hdrlen, meshhdrlen = 0;
1674 __le16 fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001675 struct ieee80211_hdr hdr;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001676 struct ieee80211s_hdr mesh_hdr;
Johannes Berge2ebc742007-07-27 15:43:22 +02001677 const u8 *encaps_data;
1678 int encaps_len, skip_header_bytes;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001679 int nh_pos, h_pos;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001680 struct sta_info *sta = NULL;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001681 u32 sta_flags = 0;
Johannes Berge2ebc742007-07-27 15:43:22 +02001682
Johannes Berge2ebc742007-07-27 15:43:22 +02001683 if (unlikely(skb->len < ETH_HLEN)) {
Patrick McHardyec634fe2009-07-05 19:23:38 -07001684 ret = NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02001685 goto fail;
1686 }
1687
1688 nh_pos = skb_network_header(skb) - skb->data;
1689 h_pos = skb_transport_header(skb) - skb->data;
1690
1691 /* convert Ethernet header to proper 802.11 header (based on
1692 * operation mode) */
1693 ethertype = (skb->data[12] << 8) | skb->data[13];
Harvey Harrison065e96052008-06-22 16:45:27 -07001694 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
Johannes Berge2ebc742007-07-27 15:43:22 +02001695
Johannes Berg51fb61e2007-12-19 01:31:27 +01001696 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02001697 case NL80211_IFTYPE_AP_VLAN:
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001698 rcu_read_lock();
Johannes Berg9bc383d2009-11-19 11:55:19 +01001699 sta = rcu_dereference(sdata->u.vlan.sta);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001700 if (sta) {
1701 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1702 /* RA TA DA SA */
1703 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001704 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001705 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1706 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1707 hdrlen = 30;
1708 sta_flags = get_sta_flags(sta);
1709 }
1710 rcu_read_unlock();
1711 if (sta)
1712 break;
1713 /* fall through */
1714 case NL80211_IFTYPE_AP:
Harvey Harrison065e96052008-06-22 16:45:27 -07001715 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001716 /* DA BSSID SA */
1717 memcpy(hdr.addr1, skb->data, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001718 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001719 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1720 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001721 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001722 case NL80211_IFTYPE_WDS:
Harvey Harrison065e96052008-06-22 16:45:27 -07001723 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001724 /* RA TA DA SA */
1725 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01001726 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001727 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1728 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1729 hdrlen = 30;
Johannes Bergcf966832007-08-28 17:01:54 -04001730 break;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001731#ifdef CONFIG_MAC80211_MESH
Johannes Berg05c914f2008-09-11 00:01:58 +02001732 case NL80211_IFTYPE_MESH_POINT:
Johannes Berg472dbc42008-09-11 00:01:49 +02001733 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001734 /* Do not send frames with mesh_ttl == 0 */
Johannes Berg472dbc42008-09-11 00:01:49 +02001735 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Patrick McHardyec634fe2009-07-05 19:23:38 -07001736 ret = NETDEV_TX_OK;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001737 goto fail;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001738 }
YanBo79617de2008-09-22 13:30:32 +08001739
Johannes Berg47846c92009-11-25 17:46:19 +01001740 if (compare_ether_addr(sdata->vif.addr,
1741 skb->data + ETH_ALEN) == 0) {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001742 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1743 skb->data, skb->data + ETH_ALEN);
1744 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1745 sdata, NULL, NULL, NULL);
YanBo79617de2008-09-22 13:30:32 +08001746 } else {
1747 /* packet from other interface */
1748 struct mesh_path *mppath;
Javier Cardona3c5772a2009-08-10 12:15:48 -07001749 int is_mesh_mcast = 1;
Johannes Berg15ff6362009-11-17 13:34:04 +01001750 const u8 *mesh_da;
YanBo79617de2008-09-22 13:30:32 +08001751
Javier Cardona3c5772a2009-08-10 12:15:48 -07001752 rcu_read_lock();
YanBo79617de2008-09-22 13:30:32 +08001753 if (is_multicast_ether_addr(skb->data))
Javier Cardona3c5772a2009-08-10 12:15:48 -07001754 /* DA TA mSA AE:SA */
1755 mesh_da = skb->data;
YanBo79617de2008-09-22 13:30:32 +08001756 else {
Johannes Berg15ff6362009-11-17 13:34:04 +01001757 static const u8 bcast[ETH_ALEN] =
1758 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1759
YanBo79617de2008-09-22 13:30:32 +08001760 mppath = mpp_path_lookup(skb->data, sdata);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001761 if (mppath) {
1762 /* RA TA mDA mSA AE:DA SA */
1763 mesh_da = mppath->mpp;
1764 is_mesh_mcast = 0;
Johannes Berg15ff6362009-11-17 13:34:04 +01001765 } else {
Javier Cardona3c5772a2009-08-10 12:15:48 -07001766 /* DA TA mSA AE:SA */
Johannes Berg15ff6362009-11-17 13:34:04 +01001767 mesh_da = bcast;
1768 }
YanBo79617de2008-09-22 13:30:32 +08001769 }
Javier Cardona3c5772a2009-08-10 12:15:48 -07001770 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
Johannes Berg47846c92009-11-25 17:46:19 +01001771 mesh_da, sdata->vif.addr);
Javier Cardona3c5772a2009-08-10 12:15:48 -07001772 rcu_read_unlock();
1773 if (is_mesh_mcast)
1774 meshhdrlen =
1775 ieee80211_new_mesh_header(&mesh_hdr,
1776 sdata,
1777 skb->data + ETH_ALEN,
1778 NULL,
1779 NULL);
1780 else
1781 meshhdrlen =
1782 ieee80211_new_mesh_header(&mesh_hdr,
1783 sdata,
1784 NULL,
1785 skb->data,
1786 skb->data + ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08001787
YanBo79617de2008-09-22 13:30:32 +08001788 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001789 break;
1790#endif
Johannes Berg05c914f2008-09-11 00:01:58 +02001791 case NL80211_IFTYPE_STATION:
Johannes Berg46900292009-02-15 12:44:28 +01001792 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
Johannes Berg9bc383d2009-11-19 11:55:19 +01001793 if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) {
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001794 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1795 /* RA TA DA SA */
Johannes Berg47846c92009-11-25 17:46:19 +01001796 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01001797 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1798 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1799 hdrlen = 30;
1800 } else {
1801 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1802 /* BSSID SA DA */
1803 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1804 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1805 hdrlen = 24;
1806 }
Johannes Bergcf966832007-08-28 17:01:54 -04001807 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001808 case NL80211_IFTYPE_ADHOC:
Johannes Berge2ebc742007-07-27 15:43:22 +02001809 /* DA SA BSSID */
1810 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1811 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01001812 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
Johannes Berge2ebc742007-07-27 15:43:22 +02001813 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001814 break;
1815 default:
Patrick McHardyec634fe2009-07-05 19:23:38 -07001816 ret = NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02001817 goto fail;
1818 }
1819
Johannes Berg7d185b82008-01-28 17:11:43 +01001820 /*
1821 * There's no need to try to look up the destination
1822 * if it is a multicast address (which can only happen
1823 * in AP mode)
1824 */
1825 if (!is_multicast_ether_addr(hdr.addr1)) {
Johannes Bergd0709a62008-02-25 16:27:46 +01001826 rcu_read_lock();
Johannes Bergabe60632009-11-25 17:46:18 +01001827 sta = sta_info_get(sdata, hdr.addr1);
1828 if (sta)
Johannes Berg07346f812008-05-03 01:02:02 +02001829 sta_flags = get_sta_flags(sta);
Johannes Bergd0709a62008-02-25 16:27:46 +01001830 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001831 }
1832
Johannes Berg3434fbd2008-05-03 00:59:37 +02001833 /* receiver and we are QoS enabled, use a QoS type frame */
Johannes Berg176be722009-03-12 23:49:28 +01001834 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
Harvey Harrison065e96052008-06-22 16:45:27 -07001835 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001836 hdrlen += 2;
1837 }
1838
1839 /*
Johannes Berg238814f2008-01-28 17:19:37 +01001840 * Drop unicast frames to unauthorised stations unless they are
1841 * EAPOL frames from the local station.
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001842 */
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001843 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1844 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001845 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1846 !(ethertype == ETH_P_PAE &&
Johannes Berg47846c92009-11-25 17:46:19 +01001847 compare_ether_addr(sdata->vif.addr,
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001848 skb->data + ETH_ALEN) == 0))) {
1849#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001850 if (net_ratelimit())
Johannes Berg0c68ae262008-10-27 15:56:10 -07001851 printk(KERN_DEBUG "%s: dropped frame to %pM"
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001852 " (unauthorized port)\n", dev->name,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001853 hdr.addr1);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001854#endif
1855
1856 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1857
Patrick McHardyec634fe2009-07-05 19:23:38 -07001858 ret = NETDEV_TX_OK;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001859 goto fail;
1860 }
1861
Harvey Harrison065e96052008-06-22 16:45:27 -07001862 hdr.frame_control = fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001863 hdr.duration_id = 0;
1864 hdr.seq_ctrl = 0;
1865
1866 skip_header_bytes = ETH_HLEN;
1867 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1868 encaps_data = bridge_tunnel_header;
1869 encaps_len = sizeof(bridge_tunnel_header);
1870 skip_header_bytes -= 2;
1871 } else if (ethertype >= 0x600) {
1872 encaps_data = rfc1042_header;
1873 encaps_len = sizeof(rfc1042_header);
1874 skip_header_bytes -= 2;
1875 } else {
1876 encaps_data = NULL;
1877 encaps_len = 0;
1878 }
1879
1880 skb_pull(skb, skip_header_bytes);
1881 nh_pos -= skip_header_bytes;
1882 h_pos -= skip_header_bytes;
1883
Johannes Berg23c07522008-05-29 10:38:53 +02001884 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001885
Johannes Berg23c07522008-05-29 10:38:53 +02001886 /*
1887 * So we need to modify the skb header and hence need a copy of
1888 * that. The head_need variable above doesn't, so far, include
1889 * the needed header space that we don't need right away. If we
1890 * can, then we don't reallocate right now but only after the
1891 * frame arrives at the master device (if it does...)
1892 *
1893 * If we cannot, however, then we will reallocate to include all
1894 * the ever needed space. Also, if we need to reallocate it anyway,
1895 * make it big enough for everything we may ever need.
1896 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001897
David S. Miller3a5be7d2008-06-18 01:19:51 -07001898 if (head_need > 0 || skb_cloned(skb)) {
Johannes Berg23c07522008-05-29 10:38:53 +02001899 head_need += IEEE80211_ENCRYPT_HEADROOM;
1900 head_need += local->tx_headroom;
1901 head_need = max_t(int, 0, head_need);
1902 if (ieee80211_skb_resize(local, skb, head_need, true))
Johannes Berge2ebc742007-07-27 15:43:22 +02001903 goto fail;
Johannes Berge2ebc742007-07-27 15:43:22 +02001904 }
1905
1906 if (encaps_data) {
1907 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1908 nh_pos += encaps_len;
1909 h_pos += encaps_len;
1910 }
Johannes Bergc29b9b92007-09-14 11:10:24 -04001911
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001912 if (meshhdrlen > 0) {
1913 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1914 nh_pos += meshhdrlen;
1915 h_pos += meshhdrlen;
1916 }
1917
Harvey Harrison065e96052008-06-22 16:45:27 -07001918 if (ieee80211_is_data_qos(fc)) {
Johannes Bergc29b9b92007-09-14 11:10:24 -04001919 __le16 *qos_control;
1920
1921 qos_control = (__le16*) skb_push(skb, 2);
1922 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1923 /*
1924 * Maybe we could actually set some fields here, for now just
1925 * initialise to zero to indicate no special operation.
1926 */
1927 *qos_control = 0;
1928 } else
1929 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1930
Johannes Berge2ebc742007-07-27 15:43:22 +02001931 nh_pos += hdrlen;
1932 h_pos += hdrlen;
1933
Stephen Hemminger68aae112007-08-24 11:29:34 -07001934 dev->stats.tx_packets++;
1935 dev->stats.tx_bytes += skb->len;
Johannes Berge2ebc742007-07-27 15:43:22 +02001936
1937 /* Update skb pointers to various headers since this modified frame
1938 * is going to go through Linux networking code that may potentially
1939 * need things like pointer to IP header. */
1940 skb_set_mac_header(skb, 0);
1941 skb_set_network_header(skb, nh_pos);
1942 skb_set_transport_header(skb, h_pos);
1943
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001944 memset(info, 0, sizeof(*info));
1945
Johannes Berge2ebc742007-07-27 15:43:22 +02001946 dev->trans_start = jiffies;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001947 ieee80211_xmit(sdata, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001948
Patrick McHardyec634fe2009-07-05 19:23:38 -07001949 return NETDEV_TX_OK;
Johannes Berge2ebc742007-07-27 15:43:22 +02001950
1951 fail:
Patrick McHardyec634fe2009-07-05 19:23:38 -07001952 if (ret == NETDEV_TX_OK)
Johannes Berge2ebc742007-07-27 15:43:22 +02001953 dev_kfree_skb(skb);
1954
1955 return ret;
1956}
1957
Johannes Berge2ebc742007-07-27 15:43:22 +02001958
Johannes Berge2530082008-05-17 00:57:14 +02001959/*
1960 * ieee80211_clear_tx_pending may not be called in a context where
1961 * it is possible that it packets could come in again.
1962 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001963void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1964{
Johannes Berg2de8e0d2009-03-23 17:28:35 +01001965 int i;
Johannes Berge2ebc742007-07-27 15:43:22 +02001966
Johannes Berg2a577d92009-03-23 17:28:37 +01001967 for (i = 0; i < local->hw.queues; i++)
1968 skb_queue_purge(&local->pending[i]);
Johannes Berge2ebc742007-07-27 15:43:22 +02001969}
1970
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001971static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
1972 struct sk_buff *skb)
1973{
1974 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1975 struct ieee80211_sub_if_data *sdata;
1976 struct sta_info *sta;
1977 struct ieee80211_hdr *hdr;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001978 int ret;
1979 bool result = true;
1980
Johannes Berg5061b0c2009-07-14 00:33:34 +02001981 sdata = vif_to_sdata(info->control.vif);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001982
1983 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
Johannes Berg5061b0c2009-07-14 00:33:34 +02001984 ieee80211_tx(sdata, skb, true);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001985 } else {
1986 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Bergabe60632009-11-25 17:46:18 +01001987 sta = sta_info_get(sdata, hdr->addr1);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001988
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001989 ret = __ieee80211_tx(local, &skb, sta, true);
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001990 if (ret != IEEE80211_TX_OK)
1991 result = false;
1992 }
1993
Johannes Bergcd8ffc82009-03-23 17:28:41 +01001994 return result;
1995}
1996
Johannes Berge2530082008-05-17 00:57:14 +02001997/*
Johannes Berg3b8d81e02009-06-17 17:43:56 +02001998 * Transmit all pending packets. Called from tasklet.
Johannes Berge2530082008-05-17 00:57:14 +02001999 */
Johannes Berge2ebc742007-07-27 15:43:22 +02002000void ieee80211_tx_pending(unsigned long data)
2001{
2002 struct ieee80211_local *local = (struct ieee80211_local *)data;
Johannes Berg7236fe22010-03-22 13:42:43 -07002003 struct ieee80211_sub_if_data *sdata;
Johannes Berg2a577d92009-03-23 17:28:37 +01002004 unsigned long flags;
Johannes Bergcd8ffc82009-03-23 17:28:41 +01002005 int i;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002006 bool txok;
Johannes Berge2ebc742007-07-27 15:43:22 +02002007
Johannes Bergf0e72852009-03-23 17:28:36 +01002008 rcu_read_lock();
Johannes Berg2a577d92009-03-23 17:28:37 +01002009
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002010 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
Johannes Berg176be722009-03-12 23:49:28 +01002011 for (i = 0; i < local->hw.queues; i++) {
Johannes Berg2a577d92009-03-23 17:28:37 +01002012 /*
2013 * If queue is stopped by something other than due to pending
2014 * frames, or we have no pending frames, proceed to next queue.
2015 */
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002016 if (local->queue_stop_reasons[i] ||
Johannes Berg2a577d92009-03-23 17:28:37 +01002017 skb_queue_empty(&local->pending[i]))
Johannes Berge2ebc742007-07-27 15:43:22 +02002018 continue;
Johannes Berge2530082008-05-17 00:57:14 +02002019
Johannes Berg2a577d92009-03-23 17:28:37 +01002020 while (!skb_queue_empty(&local->pending[i])) {
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002021 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
Johannes Berg5061b0c2009-07-14 00:33:34 +02002022 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg5061b0c2009-07-14 00:33:34 +02002023
Johannes Berga7bc3762009-07-27 10:33:31 +02002024 if (WARN_ON(!info->control.vif)) {
2025 kfree_skb(skb);
2026 continue;
2027 }
2028
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002029 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2030 flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01002031
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002032 txok = ieee80211_tx_pending_skb(local, skb);
2033 if (!txok)
2034 __skb_queue_head(&local->pending[i], skb);
2035 spin_lock_irqsave(&local->queue_stop_reason_lock,
2036 flags);
2037 if (!txok)
Johannes Berg2a577d92009-03-23 17:28:37 +01002038 break;
Johannes Berge2ebc742007-07-27 15:43:22 +02002039 }
Johannes Berg7236fe22010-03-22 13:42:43 -07002040
2041 if (skb_queue_empty(&local->pending[i]))
2042 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2043 netif_tx_wake_queue(
2044 netdev_get_tx_queue(sdata->dev, i));
Johannes Berge2ebc742007-07-27 15:43:22 +02002045 }
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002046 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
Johannes Berg2a577d92009-03-23 17:28:37 +01002047
Johannes Bergf0e72852009-03-23 17:28:36 +01002048 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002049}
2050
2051/* functions for drivers to get certain frames */
2052
Rami Rosen8e7be8d2008-12-01 13:56:55 +02002053static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002054 struct sk_buff *skb,
2055 struct beacon_data *beacon)
Johannes Berge2ebc742007-07-27 15:43:22 +02002056{
2057 u8 *pos, *tim;
2058 int aid0 = 0;
2059 int i, have_bits = 0, n1, n2;
2060
2061 /* Generate bitmap for TIM only if there are any STAs in power save
2062 * mode. */
Johannes Berge2ebc742007-07-27 15:43:22 +02002063 if (atomic_read(&bss->num_sta_ps) > 0)
2064 /* in the hope that this is faster than
2065 * checking byte-for-byte */
2066 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2067 IEEE80211_MAX_AID+1);
2068
2069 if (bss->dtim_count == 0)
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002070 bss->dtim_count = beacon->dtim_period - 1;
Johannes Berge2ebc742007-07-27 15:43:22 +02002071 else
2072 bss->dtim_count--;
2073
2074 tim = pos = (u8 *) skb_put(skb, 6);
2075 *pos++ = WLAN_EID_TIM;
2076 *pos++ = 4;
2077 *pos++ = bss->dtim_count;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002078 *pos++ = beacon->dtim_period;
Johannes Berge2ebc742007-07-27 15:43:22 +02002079
2080 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2081 aid0 = 1;
2082
2083 if (have_bits) {
2084 /* Find largest even number N1 so that bits numbered 1 through
2085 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2086 * (N2 + 1) x 8 through 2007 are 0. */
2087 n1 = 0;
2088 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2089 if (bss->tim[i]) {
2090 n1 = i & 0xfe;
2091 break;
2092 }
2093 }
2094 n2 = n1;
2095 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2096 if (bss->tim[i]) {
2097 n2 = i;
2098 break;
2099 }
2100 }
2101
2102 /* Bitmap control */
2103 *pos++ = n1 | aid0;
2104 /* Part Virt Bitmap */
2105 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2106
2107 tim[1] = n2 - n1 + 4;
2108 skb_put(skb, n2 - n1);
2109 } else {
2110 *pos++ = aid0; /* Bitmap control */
2111 *pos++ = 0; /* Part Virt Bitmap */
2112 }
Johannes Berge2ebc742007-07-27 15:43:22 +02002113}
2114
Johannes Bergeddcbb92009-10-29 08:30:35 +01002115struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2116 struct ieee80211_vif *vif,
2117 u16 *tim_offset, u16 *tim_length)
Johannes Berge2ebc742007-07-27 15:43:22 +02002118{
2119 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg9d139c82008-07-09 14:40:37 +02002120 struct sk_buff *skb = NULL;
Johannes Berge039fa42008-05-15 12:55:29 +02002121 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02002122 struct ieee80211_sub_if_data *sdata = NULL;
2123 struct ieee80211_if_ap *ap = NULL;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002124 struct beacon_data *beacon;
Johannes Berg8318d782008-01-24 19:38:38 +01002125 struct ieee80211_supported_band *sband;
Johannes Berg2e92e6f2008-05-15 12:55:27 +02002126 enum ieee80211_band band = local->hw.conf.channel->band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002127 struct ieee80211_tx_rate_control txrc;
Johannes Berg8318d782008-01-24 19:38:38 +01002128
Johannes Berg2e92e6f2008-05-15 12:55:27 +02002129 sband = local->hw.wiphy->bands[band];
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002130
2131 rcu_read_lock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002132
Johannes Berg32bfd352007-12-19 01:31:26 +01002133 sdata = vif_to_sdata(vif);
Johannes Berge2ebc742007-07-27 15:43:22 +02002134
Johannes Bergeddcbb92009-10-29 08:30:35 +01002135 if (tim_offset)
2136 *tim_offset = 0;
2137 if (tim_length)
2138 *tim_length = 0;
2139
Johannes Berg05c914f2008-09-11 00:01:58 +02002140 if (sdata->vif.type == NL80211_IFTYPE_AP) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002141 ap = &sdata->u.ap;
2142 beacon = rcu_dereference(ap->beacon);
Johannes Berg902acc72008-02-23 15:17:19 +01002143 if (ap && beacon) {
2144 /*
2145 * headroom, head length,
2146 * tail length and maximum TIM length
2147 */
2148 skb = dev_alloc_skb(local->tx_headroom +
2149 beacon->head_len +
2150 beacon->tail_len + 256);
2151 if (!skb)
2152 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002153
Johannes Berg902acc72008-02-23 15:17:19 +01002154 skb_reserve(skb, local->tx_headroom);
2155 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2156 beacon->head_len);
2157
Johannes Bergd0709a62008-02-25 16:27:46 +01002158 /*
2159 * Not very nice, but we want to allow the driver to call
2160 * ieee80211_beacon_get() as a response to the set_tim()
2161 * callback. That, however, is already invoked under the
2162 * sta_lock to guarantee consistent and race-free update
2163 * of the tim bitmap in mac80211 and the driver.
2164 */
2165 if (local->tim_in_locked_section) {
Rami Rosen8e7be8d2008-12-01 13:56:55 +02002166 ieee80211_beacon_add_tim(ap, skb, beacon);
Johannes Bergd0709a62008-02-25 16:27:46 +01002167 } else {
2168 unsigned long flags;
2169
2170 spin_lock_irqsave(&local->sta_lock, flags);
Rami Rosen8e7be8d2008-12-01 13:56:55 +02002171 ieee80211_beacon_add_tim(ap, skb, beacon);
Johannes Bergd0709a62008-02-25 16:27:46 +01002172 spin_unlock_irqrestore(&local->sta_lock, flags);
2173 }
Johannes Berg902acc72008-02-23 15:17:19 +01002174
Johannes Bergeddcbb92009-10-29 08:30:35 +01002175 if (tim_offset)
2176 *tim_offset = beacon->head_len;
2177 if (tim_length)
2178 *tim_length = skb->len - beacon->head_len;
2179
Johannes Berg902acc72008-02-23 15:17:19 +01002180 if (beacon->tail)
2181 memcpy(skb_put(skb, beacon->tail_len),
2182 beacon->tail, beacon->tail_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02002183 } else
2184 goto out;
Johannes Berg05c914f2008-09-11 00:01:58 +02002185 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Johannes Berg46900292009-02-15 12:44:28 +01002186 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
Johannes Berg9d139c82008-07-09 14:40:37 +02002187 struct ieee80211_hdr *hdr;
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002188 struct sk_buff *presp = rcu_dereference(ifibss->presp);
Johannes Berg902acc72008-02-23 15:17:19 +01002189
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002190 if (!presp)
Johannes Berg9d139c82008-07-09 14:40:37 +02002191 goto out;
2192
Johannes Bergaf8cdcd2009-04-19 21:25:43 +02002193 skb = skb_copy(presp, GFP_ATOMIC);
Johannes Berg9d139c82008-07-09 14:40:37 +02002194 if (!skb)
2195 goto out;
2196
2197 hdr = (struct ieee80211_hdr *) skb->data;
Harvey Harrisone7827a72008-07-15 18:44:13 -07002198 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2199 IEEE80211_STYPE_BEACON);
Johannes Berg902acc72008-02-23 15:17:19 +01002200 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
Johannes Berg472dbc42008-09-11 00:01:49 +02002201 struct ieee80211_mgmt *mgmt;
2202 u8 *pos;
2203
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002204 /* headroom, head length, tail length and maximum TIM length */
Johannes Berg902acc72008-02-23 15:17:19 +01002205 skb = dev_alloc_skb(local->tx_headroom + 400);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002206 if (!skb)
2207 goto out;
2208
Johannes Berg902acc72008-02-23 15:17:19 +01002209 skb_reserve(skb, local->hw.extra_tx_headroom);
2210 mgmt = (struct ieee80211_mgmt *)
2211 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2212 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
Harvey Harrison065e96052008-06-22 16:45:27 -07002213 mgmt->frame_control =
2214 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
Johannes Berg902acc72008-02-23 15:17:19 +01002215 memset(mgmt->da, 0xff, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002216 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2217 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg902acc72008-02-23 15:17:19 +01002218 mgmt->u.beacon.beacon_int =
Johannes Berg57c4d7b2009-04-23 16:10:04 +02002219 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
Johannes Berg902acc72008-02-23 15:17:19 +01002220 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002221
Johannes Berg902acc72008-02-23 15:17:19 +01002222 pos = skb_put(skb, 2);
2223 *pos++ = WLAN_EID_SSID;
2224 *pos++ = 0x0;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01002225
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12002226 mesh_mgmt_ies_add(skb, sdata);
Johannes Berg9d139c82008-07-09 14:40:37 +02002227 } else {
2228 WARN_ON(1);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002229 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02002230 }
2231
Johannes Berge039fa42008-05-15 12:55:29 +02002232 info = IEEE80211_SKB_CB(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02002233
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002234 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002235 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Johannes Berge039fa42008-05-15 12:55:29 +02002236 info->band = band;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002237
2238 memset(&txrc, 0, sizeof(txrc));
2239 txrc.hw = hw;
2240 txrc.sband = sband;
2241 txrc.bss_conf = &sdata->vif.bss_conf;
2242 txrc.skb = skb;
2243 txrc.reported_rate.idx = -1;
Jouni Malinen37eb0b12010-01-06 13:09:08 +02002244 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2245 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2246 txrc.max_rate_idx = -1;
2247 else
2248 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
Jouni Malinene00cfce2009-12-29 12:59:19 +02002249 txrc.ap = true;
2250 rate_control_get_rate(sdata, NULL, &txrc);
Johannes Berge039fa42008-05-15 12:55:29 +02002251
2252 info->control.vif = vif;
Johannes Bergf591fa52008-07-10 11:21:26 +02002253
John W. Linvillea472e712010-05-06 14:45:17 -04002254 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2255 IEEE80211_TX_CTL_ASSIGN_SEQ |
2256 IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge6a98542008-10-21 12:40:02 +02002257 out:
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002258 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002259 return skb;
2260}
Johannes Bergeddcbb92009-10-29 08:30:35 +01002261EXPORT_SYMBOL(ieee80211_beacon_get_tim);
Johannes Berge2ebc742007-07-27 15:43:22 +02002262
Kalle Valo7044cc52010-01-05 20:16:19 +02002263struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2264 struct ieee80211_vif *vif)
2265{
2266 struct ieee80211_sub_if_data *sdata;
2267 struct ieee80211_if_managed *ifmgd;
2268 struct ieee80211_pspoll *pspoll;
2269 struct ieee80211_local *local;
2270 struct sk_buff *skb;
2271
2272 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2273 return NULL;
2274
2275 sdata = vif_to_sdata(vif);
2276 ifmgd = &sdata->u.mgd;
2277 local = sdata->local;
2278
2279 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2280 if (!skb) {
2281 printk(KERN_DEBUG "%s: failed to allocate buffer for "
2282 "pspoll template\n", sdata->name);
2283 return NULL;
2284 }
2285 skb_reserve(skb, local->hw.extra_tx_headroom);
2286
2287 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2288 memset(pspoll, 0, sizeof(*pspoll));
2289 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2290 IEEE80211_STYPE_PSPOLL);
2291 pspoll->aid = cpu_to_le16(ifmgd->aid);
2292
2293 /* aid in PS-Poll has its two MSBs each set to 1 */
2294 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2295
2296 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2297 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2298
2299 return skb;
2300}
2301EXPORT_SYMBOL(ieee80211_pspoll_get);
2302
2303struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2304 struct ieee80211_vif *vif)
2305{
2306 struct ieee80211_hdr_3addr *nullfunc;
2307 struct ieee80211_sub_if_data *sdata;
2308 struct ieee80211_if_managed *ifmgd;
2309 struct ieee80211_local *local;
2310 struct sk_buff *skb;
2311
2312 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2313 return NULL;
2314
2315 sdata = vif_to_sdata(vif);
2316 ifmgd = &sdata->u.mgd;
2317 local = sdata->local;
2318
2319 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2320 if (!skb) {
2321 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2322 "template\n", sdata->name);
2323 return NULL;
2324 }
2325 skb_reserve(skb, local->hw.extra_tx_headroom);
2326
2327 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2328 sizeof(*nullfunc));
2329 memset(nullfunc, 0, sizeof(*nullfunc));
2330 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2331 IEEE80211_STYPE_NULLFUNC |
2332 IEEE80211_FCTL_TODS);
2333 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2334 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2335 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2336
2337 return skb;
2338}
2339EXPORT_SYMBOL(ieee80211_nullfunc_get);
2340
Kalle Valo05e54ea2010-01-05 20:16:38 +02002341struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2342 struct ieee80211_vif *vif,
2343 const u8 *ssid, size_t ssid_len,
2344 const u8 *ie, size_t ie_len)
2345{
2346 struct ieee80211_sub_if_data *sdata;
2347 struct ieee80211_local *local;
2348 struct ieee80211_hdr_3addr *hdr;
2349 struct sk_buff *skb;
2350 size_t ie_ssid_len;
2351 u8 *pos;
2352
2353 sdata = vif_to_sdata(vif);
2354 local = sdata->local;
2355 ie_ssid_len = 2 + ssid_len;
2356
2357 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2358 ie_ssid_len + ie_len);
2359 if (!skb) {
2360 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
2361 "request template\n", sdata->name);
2362 return NULL;
2363 }
2364
2365 skb_reserve(skb, local->hw.extra_tx_headroom);
2366
2367 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2368 memset(hdr, 0, sizeof(*hdr));
2369 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2370 IEEE80211_STYPE_PROBE_REQ);
2371 memset(hdr->addr1, 0xff, ETH_ALEN);
2372 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2373 memset(hdr->addr3, 0xff, ETH_ALEN);
2374
2375 pos = skb_put(skb, ie_ssid_len);
2376 *pos++ = WLAN_EID_SSID;
2377 *pos++ = ssid_len;
2378 if (ssid)
2379 memcpy(pos, ssid, ssid_len);
2380 pos += ssid_len;
2381
2382 if (ie) {
2383 pos = skb_put(skb, ie_len);
2384 memcpy(pos, ie, ie_len);
2385 }
2386
2387 return skb;
2388}
2389EXPORT_SYMBOL(ieee80211_probereq_get);
2390
Johannes Berg32bfd352007-12-19 01:31:26 +01002391void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02002392 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02002393 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02002394 struct ieee80211_rts *rts)
2395{
2396 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02002397
Harvey Harrison065e96052008-06-22 16:45:27 -07002398 rts->frame_control =
2399 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01002400 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2401 frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02002402 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2403 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2404}
2405EXPORT_SYMBOL(ieee80211_rts_get);
2406
Johannes Berg32bfd352007-12-19 01:31:26 +01002407void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02002408 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02002409 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02002410 struct ieee80211_cts *cts)
2411{
2412 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02002413
Harvey Harrison065e96052008-06-22 16:45:27 -07002414 cts->frame_control =
2415 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01002416 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2417 frame_len, frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02002418 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2419}
2420EXPORT_SYMBOL(ieee80211_ctstoself_get);
2421
2422struct sk_buff *
Johannes Berg32bfd352007-12-19 01:31:26 +01002423ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
Johannes Berge039fa42008-05-15 12:55:29 +02002424 struct ieee80211_vif *vif)
Johannes Berge2ebc742007-07-27 15:43:22 +02002425{
2426 struct ieee80211_local *local = hw_to_local(hw);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002427 struct sk_buff *skb = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +02002428 struct sta_info *sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002429 struct ieee80211_tx_data tx;
Johannes Berge2ebc742007-07-27 15:43:22 +02002430 struct ieee80211_sub_if_data *sdata;
2431 struct ieee80211_if_ap *bss = NULL;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002432 struct beacon_data *beacon;
Johannes Berge039fa42008-05-15 12:55:29 +02002433 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02002434
Johannes Berg32bfd352007-12-19 01:31:26 +01002435 sdata = vif_to_sdata(vif);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002436 bss = &sdata->u.ap;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002437
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002438 rcu_read_lock();
2439 beacon = rcu_dereference(bss->beacon);
2440
Johannes Berg05c914f2008-09-11 00:01:58 +02002441 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002442 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002443
Johannes Berge2ebc742007-07-27 15:43:22 +02002444 if (bss->dtim_count != 0)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002445 goto out; /* send buffered bc/mc only after DTIM beacon */
Johannes Berge039fa42008-05-15 12:55:29 +02002446
Johannes Berge2ebc742007-07-27 15:43:22 +02002447 while (1) {
2448 skb = skb_dequeue(&bss->ps_bc_buf);
2449 if (!skb)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002450 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02002451 local->total_ps_buffered--;
2452
2453 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2454 struct ieee80211_hdr *hdr =
2455 (struct ieee80211_hdr *) skb->data;
2456 /* more buffered multicast/broadcast frames ==> set
2457 * MoreData flag in IEEE 802.11 header to inform PS
2458 * STAs */
2459 hdr->frame_control |=
2460 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2461 }
2462
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002463 if (!ieee80211_tx_prepare(sdata, &tx, skb))
Johannes Berge2ebc742007-07-27 15:43:22 +02002464 break;
2465 dev_kfree_skb_any(skb);
2466 }
Johannes Berge039fa42008-05-15 12:55:29 +02002467
2468 info = IEEE80211_SKB_CB(skb);
2469
Johannes Berge2ebc742007-07-27 15:43:22 +02002470 sta = tx.sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002471 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2472 tx.channel = local->hw.conf.channel;
Johannes Berge039fa42008-05-15 12:55:29 +02002473 info->band = tx.channel->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02002474
Johannes Berg97b045d2008-06-20 01:22:30 +02002475 if (invoke_tx_handlers(&tx))
Johannes Berge2ebc742007-07-27 15:43:22 +02002476 skb = NULL;
Johannes Berg97b045d2008-06-20 01:22:30 +02002477 out:
Johannes Bergd0709a62008-02-25 16:27:46 +01002478 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002479
2480 return skb;
2481}
2482EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002483
Johannes Berg62ae67b2009-11-18 18:42:05 +01002484void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002485{
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002486 skb_set_mac_header(skb, 0);
2487 skb_set_network_header(skb, 0);
2488 skb_set_transport_header(skb, 0);
2489
Johannes Bergcf0277e2010-01-05 18:00:58 +01002490 /* send all internal mgmt frames on VO */
2491 skb_set_queue_mapping(skb, 0);
2492
Johannes Berg3d34deb2009-06-18 17:25:11 +02002493 /*
2494 * The other path calling ieee80211_xmit is from the tasklet,
2495 * and while we can handle concurrent transmissions locking
2496 * requirements are that we do not come into tx with bhs on.
2497 */
2498 local_bh_disable();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002499 ieee80211_xmit(sdata, skb);
Johannes Berg3d34deb2009-06-18 17:25:11 +02002500 local_bh_enable();
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002501}