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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 Berg2c8dccc2008-04-08 15:14:40 -040028#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010029#include "mesh.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020030#include "wep.h"
31#include "wpa.h"
32#include "wme.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040033#include "rate.h"
Johannes Berge2ebc742007-07-27 15:43:22 +020034
35#define IEEE80211_TX_OK 0
36#define IEEE80211_TX_AGAIN 1
37#define IEEE80211_TX_FRAG_AGAIN 2
38
39/* misc utils */
40
Johannes Berg03f93c32008-06-25 14:36:27 +030041static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
42 int next_frag_len)
Johannes Berge2ebc742007-07-27 15:43:22 +020043{
44 int rate, mrate, erp, dur, i;
Johannes Berg2e92e6f2008-05-15 12:55:27 +020045 struct ieee80211_rate *txrate;
Johannes Berge2ebc742007-07-27 15:43:22 +020046 struct ieee80211_local *local = tx->local;
Johannes Berg8318d782008-01-24 19:38:38 +010047 struct ieee80211_supported_band *sband;
Harvey Harrison358c8d92008-07-15 18:44:13 -070048 struct ieee80211_hdr *hdr;
Johannes Berge6a98542008-10-21 12:40:02 +020049 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
50
51 /* assume HW handles this */
52 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
53 return 0;
54
55 /* uh huh? */
56 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
57 return 0;
Johannes Berge2ebc742007-07-27 15:43:22 +020058
Johannes Berg2e92e6f2008-05-15 12:55:27 +020059 sband = local->hw.wiphy->bands[tx->channel->band];
Johannes Berge6a98542008-10-21 12:40:02 +020060 txrate = &sband->bitrates[info->control.rates[0].idx];
Johannes Berg8318d782008-01-24 19:38:38 +010061
Johannes Berge6a98542008-10-21 12:40:02 +020062 erp = txrate->flags & IEEE80211_RATE_ERP_G;
Johannes Berge2ebc742007-07-27 15:43:22 +020063
64 /*
65 * data and mgmt (except PS Poll):
66 * - during CFP: 32768
67 * - during contention period:
68 * if addr1 is group address: 0
69 * if more fragments = 0 and addr1 is individual address: time to
70 * transmit one ACK plus SIFS
71 * if more fragments = 1 and addr1 is individual address: time to
72 * transmit next fragment plus 2 x ACK plus 3 x SIFS
73 *
74 * IEEE 802.11, 9.6:
75 * - control response frame (CTS or ACK) shall be transmitted using the
76 * same rate as the immediately previous frame in the frame exchange
77 * sequence, if this rate belongs to the PHY mandatory rates, or else
78 * at the highest possible rate belonging to the PHY rates in the
79 * BSSBasicRateSet
80 */
Harvey Harrison358c8d92008-07-15 18:44:13 -070081 hdr = (struct ieee80211_hdr *)tx->skb->data;
82 if (ieee80211_is_ctl(hdr->frame_control)) {
Johannes Berge2ebc742007-07-27 15:43:22 +020083 /* TODO: These control frames are not currently sent by
Johannes Bergccd7b362008-09-11 00:01:56 +020084 * mac80211, but should they be implemented, this function
Johannes Berge2ebc742007-07-27 15:43:22 +020085 * needs to be updated to support duration field calculation.
86 *
87 * RTS: time needed to transmit pending data/mgmt frame plus
88 * one CTS frame plus one ACK frame plus 3 x SIFS
89 * CTS: duration of immediately previous RTS minus time
90 * required to transmit CTS and its SIFS
91 * ACK: 0 if immediately previous directed data/mgmt had
92 * more=0, with more=1 duration in ACK frame is duration
93 * from previous frame minus time needed to transmit ACK
94 * and its SIFS
95 * PS Poll: BIT(15) | BIT(14) | aid
96 */
97 return 0;
98 }
99
100 /* data/mgmt */
101 if (0 /* FIX: data/mgmt during CFP */)
Johannes Berg03f93c32008-06-25 14:36:27 +0300102 return cpu_to_le16(32768);
Johannes Berge2ebc742007-07-27 15:43:22 +0200103
104 if (group_addr) /* Group address as the destination - no ACK */
105 return 0;
106
107 /* Individual destination address:
108 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
109 * CTS and ACK frames shall be transmitted using the highest rate in
110 * basic rate set that is less than or equal to the rate of the
111 * immediately previous frame and that is using the same modulation
112 * (CCK or OFDM). If no basic rate set matches with these requirements,
113 * the highest mandatory rate of the PHY that is less than or equal to
114 * the rate of the previous frame is used.
115 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
116 */
117 rate = -1;
Johannes Berg8318d782008-01-24 19:38:38 +0100118 /* use lowest available if everything fails */
119 mrate = sband->bitrates[0].bitrate;
120 for (i = 0; i < sband->n_bitrates; i++) {
121 struct ieee80211_rate *r = &sband->bitrates[i];
122
123 if (r->bitrate > txrate->bitrate)
Johannes Berge2ebc742007-07-27 15:43:22 +0200124 break;
125
Johannes Bergbda39332008-10-11 01:51:51 +0200126 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
Johannes Berg8318d782008-01-24 19:38:38 +0100127 rate = r->bitrate;
Johannes Berge2ebc742007-07-27 15:43:22 +0200128
Johannes Berg8318d782008-01-24 19:38:38 +0100129 switch (sband->band) {
130 case IEEE80211_BAND_2GHZ: {
131 u32 flag;
132 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
133 flag = IEEE80211_RATE_MANDATORY_G;
134 else
135 flag = IEEE80211_RATE_MANDATORY_B;
136 if (r->flags & flag)
137 mrate = r->bitrate;
138 break;
139 }
140 case IEEE80211_BAND_5GHZ:
141 if (r->flags & IEEE80211_RATE_MANDATORY_A)
142 mrate = r->bitrate;
143 break;
144 case IEEE80211_NUM_BANDS:
145 WARN_ON(1);
146 break;
147 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200148 }
149 if (rate == -1) {
150 /* No matching basic rate found; use highest suitable mandatory
151 * PHY rate */
152 rate = mrate;
153 }
154
155 /* Time needed to transmit ACK
156 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
157 * to closest integer */
158
159 dur = ieee80211_frame_duration(local, 10, rate, erp,
Johannes Bergbda39332008-10-11 01:51:51 +0200160 tx->sdata->vif.bss_conf.use_short_preamble);
Johannes Berge2ebc742007-07-27 15:43:22 +0200161
162 if (next_frag_len) {
163 /* Frame is fragmented: duration increases with time needed to
164 * transmit next fragment plus ACK and 2 x SIFS. */
165 dur *= 2; /* ACK + SIFS */
166 /* next fragment */
167 dur += ieee80211_frame_duration(local, next_frag_len,
Johannes Berg8318d782008-01-24 19:38:38 +0100168 txrate->bitrate, erp,
Johannes Bergbda39332008-10-11 01:51:51 +0200169 tx->sdata->vif.bss_conf.use_short_preamble);
Johannes Berge2ebc742007-07-27 15:43:22 +0200170 }
171
Johannes Berg03f93c32008-06-25 14:36:27 +0300172 return cpu_to_le16(dur);
Johannes Berge2ebc742007-07-27 15:43:22 +0200173}
174
Johannes Berg133b8222008-09-16 14:18:59 +0200175static int inline is_ieee80211_device(struct ieee80211_local *local,
176 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +0200177{
Johannes Berg133b8222008-09-16 14:18:59 +0200178 return local == wdev_priv(dev->ieee80211_ptr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200179}
180
181/* tx handlers */
182
Johannes Bergd9e8a702008-06-30 15:10:44 +0200183static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100184ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200185{
Harvey Harrison358c8d92008-07-15 18:44:13 -0700186
Johannes Berge039fa42008-05-15 12:55:29 +0200187 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berge039fa42008-05-15 12:55:29 +0200188 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge2ebc742007-07-27 15:43:22 +0200189 u32 sta_flags;
190
Johannes Berge039fa42008-05-15 12:55:29 +0200191 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100192 return TX_CONTINUE;
Johannes Berg58d41852007-09-26 17:53:18 +0200193
Johannes Bergc2b13452008-09-11 00:01:55 +0200194 if (unlikely(tx->local->sw_scanning) &&
Harvey Harrison358c8d92008-07-15 18:44:13 -0700195 !ieee80211_is_probe_req(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100196 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200197
Johannes Berg05c914f2008-09-11 00:01:58 +0200198 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100199 return TX_CONTINUE;
200
Johannes Berg5cf121c2008-02-25 16:27:43 +0100201 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
Johannes Berg9ae54c82008-01-31 19:48:20 +0100202 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200203
Johannes Berg07346f812008-05-03 01:02:02 +0200204 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
Johannes Berge2ebc742007-07-27 15:43:22 +0200205
Johannes Berg5cf121c2008-02-25 16:27:43 +0100206 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200207 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200208 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Harvey Harrison358c8d92008-07-15 18:44:13 -0700209 ieee80211_is_data(hdr->frame_control))) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200210#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
211 printk(KERN_DEBUG "%s: dropped data frame to not "
Johannes Berg0c68ae262008-10-27 15:56:10 -0700212 "associated station %pM\n",
213 tx->dev->name, hdr->addr1);
Johannes Berge2ebc742007-07-27 15:43:22 +0200214#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
215 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100216 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200217 }
218 } else {
Harvey Harrison358c8d92008-07-15 18:44:13 -0700219 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
Johannes Berge2ebc742007-07-27 15:43:22 +0200220 tx->local->num_sta == 0 &&
Johannes Berg05c914f2008-09-11 00:01:58 +0200221 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200222 /*
223 * No associated STAs - no need to send multicast
224 * frames.
225 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100226 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200227 }
Johannes Berg9ae54c82008-01-31 19:48:20 +0100228 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200229 }
230
Johannes Berg9ae54c82008-01-31 19:48:20 +0100231 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200232}
233
Johannes Berge2ebc742007-07-27 15:43:22 +0200234/* This function is called whenever the AP is about to exceed the maximum limit
235 * of buffered frames for power saving STAs. This situation should not really
236 * happen often during normal operation, so dropping the oldest buffered packet
237 * from each queue should be OK to make some room for new frames. */
238static void purge_old_ps_buffers(struct ieee80211_local *local)
239{
240 int total = 0, purged = 0;
241 struct sk_buff *skb;
242 struct ieee80211_sub_if_data *sdata;
243 struct sta_info *sta;
244
Johannes Berg79010422007-09-18 17:29:21 -0400245 /*
246 * virtual interfaces are protected by RCU
247 */
248 rcu_read_lock();
249
250 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200251 struct ieee80211_if_ap *ap;
Johannes Berg05c914f2008-09-11 00:01:58 +0200252 if (sdata->vif.type != NL80211_IFTYPE_AP)
Johannes Berge2ebc742007-07-27 15:43:22 +0200253 continue;
254 ap = &sdata->u.ap;
255 skb = skb_dequeue(&ap->ps_bc_buf);
256 if (skb) {
257 purged++;
258 dev_kfree_skb(skb);
259 }
260 total += skb_queue_len(&ap->ps_bc_buf);
261 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200262
Johannes Bergd0709a62008-02-25 16:27:46 +0100263 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200264 skb = skb_dequeue(&sta->ps_tx_buf);
265 if (skb) {
266 purged++;
267 dev_kfree_skb(skb);
268 }
269 total += skb_queue_len(&sta->ps_tx_buf);
270 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100271
272 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +0200273
274 local->total_ps_buffered = total;
Rami Rosen54223992008-07-24 10:40:37 +0300275#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berge2ebc742007-07-27 15:43:22 +0200276 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
Johannes Bergdd1cd4c2007-09-18 17:29:20 -0400277 wiphy_name(local->hw.wiphy), purged);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200278#endif
Johannes Berge2ebc742007-07-27 15:43:22 +0200279}
280
Johannes Berg9ae54c82008-01-31 19:48:20 +0100281static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100282ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200283{
Johannes Berge039fa42008-05-15 12:55:29 +0200284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berge039fa42008-05-15 12:55:29 +0200286
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100287 /*
288 * broadcast/multicast frame
289 *
290 * If any of the associated stations is in power save mode,
291 * the frame is buffered to be sent after DTIM beacon frame.
292 * This is done either by the hardware or us.
293 */
294
Johannes Berg3e122be2008-07-09 14:40:34 +0200295 /* powersaving STAs only in AP/VLAN mode */
296 if (!tx->sdata->bss)
297 return TX_CONTINUE;
298
299 /* no buffering for ordered frames */
Harvey Harrison358c8d92008-07-15 18:44:13 -0700300 if (ieee80211_has_order(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100301 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100302
303 /* no stations in PS mode */
304 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100305 return TX_CONTINUE;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100306
307 /* buffered in mac80211 */
308 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200309 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
310 purge_old_ps_buffers(tx->local);
311 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
312 AP_MAX_BC_BUFFER) {
Rami Rosen54223992008-07-24 10:40:37 +0300313#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berge2ebc742007-07-27 15:43:22 +0200314 if (net_ratelimit()) {
315 printk(KERN_DEBUG "%s: BC TX buffer full - "
316 "dropping the oldest frame\n",
317 tx->dev->name);
318 }
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200319#endif
Johannes Berge2ebc742007-07-27 15:43:22 +0200320 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
321 } else
322 tx->local->total_ps_buffered++;
323 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100324 return TX_QUEUED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200325 }
326
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100327 /* buffered in hardware */
Johannes Berge039fa42008-05-15 12:55:29 +0200328 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
Johannes Berg7d54d0d2007-12-19 01:31:25 +0100329
Johannes Berg9ae54c82008-01-31 19:48:20 +0100330 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200331}
332
Johannes Berg9ae54c82008-01-31 19:48:20 +0100333static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100334ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200335{
336 struct sta_info *sta = tx->sta;
Johannes Berge039fa42008-05-15 12:55:29 +0200337 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700338 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berg07346f812008-05-03 01:02:02 +0200339 u32 staflags;
Johannes Berge2ebc742007-07-27 15:43:22 +0200340
Harvey Harrison358c8d92008-07-15 18:44:13 -0700341 if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100342 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200343
Johannes Berg07346f812008-05-03 01:02:02 +0200344 staflags = get_sta_flags(sta);
345
346 if (unlikely((staflags & WLAN_STA_PS) &&
347 !(staflags & WLAN_STA_PSPOLL))) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200348#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700349 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
Johannes Berge2ebc742007-07-27 15:43:22 +0200350 "before %d)\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -0700351 sta->sta.addr, sta->sta.aid,
Johannes Berge2ebc742007-07-27 15:43:22 +0200352 skb_queue_len(&sta->ps_tx_buf));
353#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berge2ebc742007-07-27 15:43:22 +0200354 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
355 purge_old_ps_buffers(tx->local);
356 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
357 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
Rami Rosen54223992008-07-24 10:40:37 +0300358#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berge2ebc742007-07-27 15:43:22 +0200359 if (net_ratelimit()) {
Johannes Berg0c68ae262008-10-27 15:56:10 -0700360 printk(KERN_DEBUG "%s: STA %pM TX "
Johannes Berge2ebc742007-07-27 15:43:22 +0200361 "buffer full - dropping oldest frame\n",
Johannes Berg0c68ae262008-10-27 15:56:10 -0700362 tx->dev->name, sta->sta.addr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200363 }
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200364#endif
Johannes Berge2ebc742007-07-27 15:43:22 +0200365 dev_kfree_skb(old);
366 } else
367 tx->local->total_ps_buffered++;
Johannes Berg004c8722008-02-20 11:21:35 +0100368
Johannes Berge2ebc742007-07-27 15:43:22 +0200369 /* Queue frame to be sent after STA sends an PS Poll frame */
Johannes Berg004c8722008-02-20 11:21:35 +0100370 if (skb_queue_empty(&sta->ps_tx_buf))
371 sta_info_set_tim_bit(sta);
372
Johannes Berge039fa42008-05-15 12:55:29 +0200373 info->control.jiffies = jiffies;
Johannes Berge2ebc742007-07-27 15:43:22 +0200374 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100375 return TX_QUEUED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200376 }
377#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg07346f812008-05-03 01:02:02 +0200378 else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) {
Johannes Berg0c68ae262008-10-27 15:56:10 -0700379 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
Johannes Berge2ebc742007-07-27 15:43:22 +0200380 "set -> send frame\n", tx->dev->name,
Johannes Berg0c68ae262008-10-27 15:56:10 -0700381 sta->sta.addr);
Johannes Berge2ebc742007-07-27 15:43:22 +0200382 }
383#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
Johannes Berg07346f812008-05-03 01:02:02 +0200384 clear_sta_flags(sta, WLAN_STA_PSPOLL);
Johannes Berge2ebc742007-07-27 15:43:22 +0200385
Johannes Berg9ae54c82008-01-31 19:48:20 +0100386 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200387}
388
Johannes Bergd9e8a702008-06-30 15:10:44 +0200389static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100390ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200391{
Johannes Berg5cf121c2008-02-25 16:27:43 +0100392 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100393 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200394
Johannes Berg5cf121c2008-02-25 16:27:43 +0100395 if (tx->flags & IEEE80211_TX_UNICAST)
Johannes Berge2ebc742007-07-27 15:43:22 +0200396 return ieee80211_tx_h_unicast_ps_buf(tx);
397 else
398 return ieee80211_tx_h_multicast_ps_buf(tx);
399}
400
Johannes Bergd9e8a702008-06-30 15:10:44 +0200401static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100402ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200403{
Johannes Bergd4e46a32007-09-14 11:10:24 -0400404 struct ieee80211_key *key;
Johannes Berge039fa42008-05-15 12:55:29 +0200405 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison358c8d92008-07-15 18:44:13 -0700406 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400407
Johannes Bergd0f09802008-07-29 11:32:07 +0200408 if (unlikely(tx->skb->do_not_encrypt))
Johannes Berge2ebc742007-07-27 15:43:22 +0200409 tx->key = NULL;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400410 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
411 tx->key = key;
412 else if ((key = rcu_dereference(tx->sdata->default_key)))
413 tx->key = key;
Johannes Berge2ebc742007-07-27 15:43:22 +0200414 else if (tx->sdata->drop_unencrypted &&
Johannes Bergd0f09802008-07-29 11:32:07 +0200415 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
Johannes Berge039fa42008-05-15 12:55:29 +0200416 !(info->flags & IEEE80211_TX_CTL_INJECTED)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200417 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
Johannes Berg9ae54c82008-01-31 19:48:20 +0100418 return TX_DROP;
Johannes Berg176e4f82007-12-18 15:27:47 +0100419 } else
Johannes Berge2ebc742007-07-27 15:43:22 +0200420 tx->key = NULL;
421
422 if (tx->key) {
423 tx->key->tx_rx_count++;
Johannes Berg011bfcc2007-09-17 01:29:25 -0400424 /* TODO: add threshold stuff again */
Johannes Berg176e4f82007-12-18 15:27:47 +0100425
426 switch (tx->key->conf.alg) {
427 case ALG_WEP:
Harvey Harrison358c8d92008-07-15 18:44:13 -0700428 if (ieee80211_is_auth(hdr->frame_control))
Johannes Berg176e4f82007-12-18 15:27:47 +0100429 break;
430 case ALG_TKIP:
431 case ALG_CCMP:
Harvey Harrison358c8d92008-07-15 18:44:13 -0700432 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg176e4f82007-12-18 15:27:47 +0100433 tx->key = NULL;
434 break;
435 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200436 }
437
Johannes Berg176e4f82007-12-18 15:27:47 +0100438 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
Johannes Bergd0f09802008-07-29 11:32:07 +0200439 tx->skb->do_not_encrypt = 1;
Johannes Berg176e4f82007-12-18 15:27:47 +0100440
Johannes Berg9ae54c82008-01-31 19:48:20 +0100441 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200442}
443
Johannes Bergd9e8a702008-06-30 15:10:44 +0200444static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100445ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200446{
Johannes Berge039fa42008-05-15 12:55:29 +0200447 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge6a98542008-10-21 12:40:02 +0200448 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
449 struct ieee80211_supported_band *sband;
450 struct ieee80211_rate *rate;
451 int i, len;
452 bool inval = false, rts = false, short_preamble = false;
453 struct ieee80211_tx_rate_control txrc;
454
455 memset(&txrc, 0, sizeof(txrc));
Johannes Berg8318d782008-01-24 19:38:38 +0100456
Johannes Berg2e92e6f2008-05-15 12:55:27 +0200457 sband = tx->local->hw.wiphy->bands[tx->channel->band];
Johannes Berge2ebc742007-07-27 15:43:22 +0200458
Johannes Berge6a98542008-10-21 12:40:02 +0200459 len = min_t(int, tx->skb->len + FCS_LEN,
460 tx->local->fragmentation_threshold);
Johannes Berg58d41852007-09-26 17:53:18 +0200461
Johannes Berge6a98542008-10-21 12:40:02 +0200462 /* set up the tx rate control struct we give the RC algo */
463 txrc.hw = local_to_hw(tx->local);
464 txrc.sband = sband;
465 txrc.bss_conf = &tx->sdata->vif.bss_conf;
466 txrc.skb = tx->skb;
467 txrc.reported_rate.idx = -1;
468 txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
Johannes Berg58d41852007-09-26 17:53:18 +0200469
Johannes Berge6a98542008-10-21 12:40:02 +0200470 /* set up RTS protection if desired */
471 if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD &&
472 len > tx->local->rts_threshold) {
473 txrc.rts = rts = true;
Johannes Berge2ebc742007-07-27 15:43:22 +0200474 }
Johannes Berge6a98542008-10-21 12:40:02 +0200475
476 /*
477 * Use short preamble if the BSS can handle it, but not for
478 * management frames unless we know the receiver can handle
479 * that -- the management frame might be to a station that
480 * just wants a probe response.
481 */
482 if (tx->sdata->vif.bss_conf.use_short_preamble &&
483 (ieee80211_is_data(hdr->frame_control) ||
484 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
485 txrc.short_preamble = short_preamble = true;
486
487
488 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
489
490 if (unlikely(info->control.rates[0].idx < 0))
491 return TX_DROP;
492
493 if (txrc.reported_rate.idx < 0)
494 txrc.reported_rate = info->control.rates[0];
495
496 if (tx->sta)
497 tx->sta->last_tx_rate = txrc.reported_rate;
498
499 if (unlikely(!info->control.rates[0].count))
500 info->control.rates[0].count = 1;
501
502 if (is_multicast_ether_addr(hdr->addr1)) {
503 /*
504 * XXX: verify the rate is in the basic rateset
505 */
506 return TX_CONTINUE;
507 }
508
509 /*
510 * set up the RTS/CTS rate as the fastest basic rate
511 * that is not faster than the data rate
512 *
513 * XXX: Should this check all retry rates?
514 */
515 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
516 s8 baserate = 0;
517
518 rate = &sband->bitrates[info->control.rates[0].idx];
519
520 for (i = 0; i < sband->n_bitrates; i++) {
521 /* must be a basic rate */
522 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
523 continue;
524 /* must not be faster than the data rate */
525 if (sband->bitrates[i].bitrate > rate->bitrate)
526 continue;
527 /* maximum */
528 if (sband->bitrates[baserate].bitrate <
529 sband->bitrates[i].bitrate)
530 baserate = i;
531 }
532
533 info->control.rts_cts_rate_idx = baserate;
534 }
535
536 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
537 /*
538 * make sure there's no valid rate following
539 * an invalid one, just in case drivers don't
540 * take the API seriously to stop at -1.
541 */
542 if (inval) {
543 info->control.rates[i].idx = -1;
544 continue;
545 }
546 if (info->control.rates[i].idx < 0) {
547 inval = true;
548 continue;
549 }
550
551 /*
552 * For now assume MCS is already set up correctly, this
553 * needs to be fixed.
554 */
555 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
556 WARN_ON(info->control.rates[i].idx > 76);
557 continue;
558 }
559
560 /* set up RTS protection if desired */
561 if (rts)
562 info->control.rates[i].flags |=
563 IEEE80211_TX_RC_USE_RTS_CTS;
564
565 /* RC is busted */
Sujith075cbc92008-10-23 12:14:02 +0530566 if (WARN_ON_ONCE(info->control.rates[i].idx >=
567 sband->n_bitrates)) {
Johannes Berge6a98542008-10-21 12:40:02 +0200568 info->control.rates[i].idx = -1;
569 continue;
570 }
571
572 rate = &sband->bitrates[info->control.rates[i].idx];
573
574 /* set up short preamble */
575 if (short_preamble &&
576 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
577 info->control.rates[i].flags |=
578 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
579
580 /* set up G protection */
581 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
582 rate->flags & IEEE80211_RATE_ERP_G)
583 info->control.rates[i].flags |=
584 IEEE80211_TX_RC_USE_CTS_PROTECT;
585 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200586
Johannes Berg9ae54c82008-01-31 19:48:20 +0100587 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200588}
589
Johannes Bergd9e8a702008-06-30 15:10:44 +0200590static ieee80211_tx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +0100591ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200592{
Johannes Berge039fa42008-05-15 12:55:29 +0200593 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Johannes Berge2ebc742007-07-27 15:43:22 +0200594
Johannes Berge2454942008-05-15 12:55:28 +0200595 if (tx->sta)
Johannes Berg17741cd2008-09-11 00:02:02 +0200596 info->control.sta = &tx->sta->sta;
Johannes Berge2ebc742007-07-27 15:43:22 +0200597
Johannes Berg9ae54c82008-01-31 19:48:20 +0100598 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200599}
600
Johannes Bergd9e8a702008-06-30 15:10:44 +0200601static ieee80211_tx_result debug_noinline
Johannes Bergf591fa52008-07-10 11:21:26 +0200602ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
603{
604 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
605 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
606 u16 *seq;
607 u8 *qc;
608 int tid;
609
Johannes Berg25d834e2008-09-12 22:52:47 +0200610 /*
611 * Packet injection may want to control the sequence
612 * number, if we have no matching interface then we
613 * neither assign one ourselves nor ask the driver to.
614 */
615 if (unlikely(!info->control.vif))
616 return TX_CONTINUE;
617
Johannes Bergf591fa52008-07-10 11:21:26 +0200618 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
619 return TX_CONTINUE;
620
621 if (ieee80211_hdrlen(hdr->frame_control) < 24)
622 return TX_CONTINUE;
623
Johannes Berg94778282008-10-10 13:21:59 +0200624 /*
625 * Anything but QoS data that has a sequence number field
626 * (is long enough) gets a sequence number from the global
627 * counter.
628 */
Johannes Bergf591fa52008-07-10 11:21:26 +0200629 if (!ieee80211_is_data_qos(hdr->frame_control)) {
Johannes Berg94778282008-10-10 13:21:59 +0200630 /* driver should assign sequence number */
Johannes Bergf591fa52008-07-10 11:21:26 +0200631 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
Johannes Berg94778282008-10-10 13:21:59 +0200632 /* for pure STA mode without beacons, we can do it */
633 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
634 tx->sdata->sequence_number += 0x10;
635 tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
Johannes Bergf591fa52008-07-10 11:21:26 +0200636 return TX_CONTINUE;
637 }
638
639 /*
640 * This should be true for injected/management frames only, for
641 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
642 * above since they are not QoS-data frames.
643 */
644 if (!tx->sta)
645 return TX_CONTINUE;
646
647 /* include per-STA, per-TID sequence counter */
648
649 qc = ieee80211_get_qos_ctl(hdr);
650 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
651 seq = &tx->sta->tid_seq[tid];
652
653 hdr->seq_ctrl = cpu_to_le16(*seq);
654
655 /* Increase the sequence number. */
656 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
657
658 return TX_CONTINUE;
659}
660
661static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200662ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
663{
Sujith8b30b1f2008-10-24 09:55:27 +0530664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
Harvey Harrison065e96052008-06-22 16:45:27 -0700665 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
Johannes Berge2454942008-05-15 12:55:28 +0200666 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
667 struct sk_buff **frags, *first, *frag;
668 int i;
669 u16 seq;
670 u8 *pos;
671 int frag_threshold = tx->local->fragmentation_threshold;
672
673 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
674 return TX_CONTINUE;
675
Johannes Bergeefce912008-05-17 00:57:13 +0200676 /*
677 * Warn when submitting a fragmented A-MPDU frame and drop it.
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +0300678 * This scenario is handled in __ieee80211_tx_prepare but extra
679 * caution taken here as fragmented ampdu may cause Tx stop.
Johannes Bergeefce912008-05-17 00:57:13 +0200680 */
Sujith8b30b1f2008-10-24 09:55:27 +0530681 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Bergeefce912008-05-17 00:57:13 +0200682 return TX_DROP;
683
Johannes Berge2454942008-05-15 12:55:28 +0200684 first = tx->skb;
685
Harvey Harrison065e96052008-06-22 16:45:27 -0700686 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2454942008-05-15 12:55:28 +0200687 payload_len = first->len - hdrlen;
688 per_fragm = frag_threshold - hdrlen - FCS_LEN;
689 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
690
691 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
692 if (!frags)
693 goto fail;
694
695 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
696 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
697 pos = first->data + hdrlen + per_fragm;
698 left = payload_len - per_fragm;
699 for (i = 0; i < num_fragm - 1; i++) {
700 struct ieee80211_hdr *fhdr;
701 size_t copylen;
702
703 if (left <= 0)
704 goto fail;
705
706 /* reserve enough extra head and tail room for possible
707 * encryption */
708 frag = frags[i] =
709 dev_alloc_skb(tx->local->tx_headroom +
710 frag_threshold +
711 IEEE80211_ENCRYPT_HEADROOM +
712 IEEE80211_ENCRYPT_TAILROOM);
713 if (!frag)
714 goto fail;
Johannes Berge6a98542008-10-21 12:40:02 +0200715
Johannes Berge2454942008-05-15 12:55:28 +0200716 /* Make sure that all fragments use the same priority so
717 * that they end up using the same TX queue */
718 frag->priority = first->priority;
Johannes Berge6a98542008-10-21 12:40:02 +0200719
Johannes Berge2454942008-05-15 12:55:28 +0200720 skb_reserve(frag, tx->local->tx_headroom +
721 IEEE80211_ENCRYPT_HEADROOM);
Johannes Berge6a98542008-10-21 12:40:02 +0200722
723 /* copy TX information */
724 info = IEEE80211_SKB_CB(frag);
725 memcpy(info, first->cb, sizeof(frag->cb));
726
727 /* copy/fill in 802.11 header */
Johannes Berge2454942008-05-15 12:55:28 +0200728 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
729 memcpy(fhdr, first->data, hdrlen);
Johannes Berge2454942008-05-15 12:55:28 +0200730 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
Johannes Berge6a98542008-10-21 12:40:02 +0200731
732 if (i == num_fragm - 2) {
733 /* clear MOREFRAGS bit for the last fragment */
734 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
735 } else {
736 /*
737 * No multi-rate retries for fragmented frames, that
738 * would completely throw off the NAV at other STAs.
739 */
740 info->control.rates[1].idx = -1;
741 info->control.rates[2].idx = -1;
742 info->control.rates[3].idx = -1;
743 info->control.rates[4].idx = -1;
744 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
745 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
746 }
747
748 /* copy data */
Johannes Berge2454942008-05-15 12:55:28 +0200749 copylen = left > per_fragm ? per_fragm : left;
750 memcpy(skb_put(frag, copylen), pos, copylen);
Johannes Berge6a98542008-10-21 12:40:02 +0200751
Johannes Berg03f93c32008-06-25 14:36:27 +0300752 skb_copy_queue_mapping(frag, first);
Johannes Berge6a98542008-10-21 12:40:02 +0200753
Johannes Bergd0f09802008-07-29 11:32:07 +0200754 frag->do_not_encrypt = first->do_not_encrypt;
Johannes Berge2454942008-05-15 12:55:28 +0200755
756 pos += copylen;
757 left -= copylen;
758 }
759 skb_trim(first, hdrlen + per_fragm);
760
761 tx->num_extra_frag = num_fragm - 1;
762 tx->extra_frag = frags;
763
764 return TX_CONTINUE;
765
766 fail:
Johannes Berge2454942008-05-15 12:55:28 +0200767 if (frags) {
768 for (i = 0; i < num_fragm - 1; i++)
769 if (frags[i])
770 dev_kfree_skb(frags[i]);
771 kfree(frags);
772 }
773 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
774 return TX_DROP;
775}
776
Johannes Bergd9e8a702008-06-30 15:10:44 +0200777static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200778ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
779{
780 if (!tx->key)
781 return TX_CONTINUE;
782
783 switch (tx->key->conf.alg) {
784 case ALG_WEP:
785 return ieee80211_crypto_wep_encrypt(tx);
786 case ALG_TKIP:
787 return ieee80211_crypto_tkip_encrypt(tx);
788 case ALG_CCMP:
789 return ieee80211_crypto_ccmp_encrypt(tx);
790 }
791
792 /* not reached */
793 WARN_ON(1);
794 return TX_DROP;
795}
796
Johannes Bergd9e8a702008-06-30 15:10:44 +0200797static ieee80211_tx_result debug_noinline
Johannes Berg03f93c32008-06-25 14:36:27 +0300798ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
799{
800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
801 int next_len, i;
802 int group_addr = is_multicast_ether_addr(hdr->addr1);
803
804 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) {
805 hdr->duration_id = ieee80211_duration(tx, group_addr, 0);
806 return TX_CONTINUE;
807 }
808
809 hdr->duration_id = ieee80211_duration(tx, group_addr,
810 tx->extra_frag[0]->len);
811
812 for (i = 0; i < tx->num_extra_frag; i++) {
Johannes Berge6a98542008-10-21 12:40:02 +0200813 if (i + 1 < tx->num_extra_frag)
Johannes Berg03f93c32008-06-25 14:36:27 +0300814 next_len = tx->extra_frag[i + 1]->len;
Johannes Berge6a98542008-10-21 12:40:02 +0200815 else
Johannes Berg03f93c32008-06-25 14:36:27 +0300816 next_len = 0;
Johannes Berg03f93c32008-06-25 14:36:27 +0300817
818 hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data;
819 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
820 }
821
822 return TX_CONTINUE;
823}
824
Johannes Bergd9e8a702008-06-30 15:10:44 +0200825static ieee80211_tx_result debug_noinline
Johannes Berge2454942008-05-15 12:55:28 +0200826ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +0200827{
Johannes Berg9e72ebd2008-05-21 17:33:42 +0200828 int i;
Johannes Berg2e92e6f2008-05-15 12:55:27 +0200829
Johannes Berg9e72ebd2008-05-21 17:33:42 +0200830 if (!tx->sta)
831 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200832
Johannes Berg9e72ebd2008-05-21 17:33:42 +0200833 tx->sta->tx_packets++;
834 tx->sta->tx_fragments++;
835 tx->sta->tx_bytes += tx->skb->len;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100836 if (tx->extra_frag) {
Johannes Berg9e72ebd2008-05-21 17:33:42 +0200837 tx->sta->tx_fragments += tx->num_extra_frag;
838 for (i = 0; i < tx->num_extra_frag; i++)
839 tx->sta->tx_bytes += tx->extra_frag[i]->len;
Johannes Berge2454942008-05-15 12:55:28 +0200840 }
841
Johannes Berg9ae54c82008-01-31 19:48:20 +0100842 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200843}
844
Johannes Berge2ebc742007-07-27 15:43:22 +0200845
Johannes Berge2ebc742007-07-27 15:43:22 +0200846/* actual transmit path */
847
848/*
849 * deal with packet injection down monitor interface
850 * with Radiotap Header -- only called for monitor mode interface
851 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100852static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100853__ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
Johannes Berg58d41852007-09-26 17:53:18 +0200854 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +0200855{
856 /*
857 * this is the moment to interpret and discard the radiotap header that
858 * must be at the start of the packet injected in Monitor mode
859 *
860 * Need to take some care with endian-ness since radiotap
861 * args are little-endian
862 */
863
864 struct ieee80211_radiotap_iterator iterator;
865 struct ieee80211_radiotap_header *rthdr =
866 (struct ieee80211_radiotap_header *) skb->data;
Johannes Berg8318d782008-01-24 19:38:38 +0100867 struct ieee80211_supported_band *sband;
Johannes Berge2ebc742007-07-27 15:43:22 +0200868 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
869
Johannes Berg2e92e6f2008-05-15 12:55:27 +0200870 sband = tx->local->hw.wiphy->bands[tx->channel->band];
Johannes Berg8318d782008-01-24 19:38:38 +0100871
Johannes Bergd0f09802008-07-29 11:32:07 +0200872 skb->do_not_encrypt = 1;
Johannes Berg5cf121c2008-02-25 16:27:43 +0100873 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200874
875 /*
876 * for every radiotap entry that is present
877 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
878 * entries present, or -EINVAL on error)
879 */
880
881 while (!ret) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200882 ret = ieee80211_radiotap_iterator_next(&iterator);
883
884 if (ret)
885 continue;
886
887 /* see if this argument is something we can use */
888 switch (iterator.this_arg_index) {
889 /*
890 * You must take care when dereferencing iterator.this_arg
891 * for multibyte types... the pointer is not aligned. Use
892 * get_unaligned((type *)iterator.this_arg) to dereference
893 * iterator.this_arg for type "type" safely on all arches.
894 */
Johannes Berge2ebc742007-07-27 15:43:22 +0200895 case IEEE80211_RADIOTAP_FLAGS:
896 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
897 /*
898 * this indicates that the skb we have been
899 * handed has the 32-bit FCS CRC at the end...
900 * we should react to that by snipping it off
901 * because it will be recomputed and added
902 * on transmission
903 */
904 if (skb->len < (iterator.max_length + FCS_LEN))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100905 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200906
907 skb_trim(skb, skb->len - FCS_LEN);
908 }
Johannes Berg58d41852007-09-26 17:53:18 +0200909 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
Johannes Bergd0f09802008-07-29 11:32:07 +0200910 tx->skb->do_not_encrypt = 0;
Johannes Berg58d41852007-09-26 17:53:18 +0200911 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
Johannes Berg5cf121c2008-02-25 16:27:43 +0100912 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200913 break;
914
Johannes Berg58d41852007-09-26 17:53:18 +0200915 /*
916 * Please update the file
917 * Documentation/networking/mac80211-injection.txt
918 * when parsing new fields here.
919 */
920
Johannes Berge2ebc742007-07-27 15:43:22 +0200921 default:
922 break;
923 }
924 }
925
926 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100927 return TX_DROP;
Johannes Berge2ebc742007-07-27 15:43:22 +0200928
929 /*
930 * remove the radiotap header
931 * iterator->max_length was sanity-checked against
932 * skb->len by iterator init
933 */
934 skb_pull(skb, iterator.max_length);
935
Johannes Berg9ae54c82008-01-31 19:48:20 +0100936 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +0200937}
938
Johannes Berg58d41852007-09-26 17:53:18 +0200939/*
940 * initialises @tx
941 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100942static ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100943__ieee80211_tx_prepare(struct ieee80211_tx_data *tx,
Johannes Berge2ebc742007-07-27 15:43:22 +0200944 struct sk_buff *skb,
Johannes Berge039fa42008-05-15 12:55:29 +0200945 struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +0200946{
947 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
Johannes Berg58d41852007-09-26 17:53:18 +0200948 struct ieee80211_hdr *hdr;
Johannes Berge2ebc742007-07-27 15:43:22 +0200949 struct ieee80211_sub_if_data *sdata;
Johannes Berge039fa42008-05-15 12:55:29 +0200950 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +0200951
Sujith8b30b1f2008-10-24 09:55:27 +0530952 int hdrlen, tid;
953 u8 *qc, *state;
Johannes Berge2ebc742007-07-27 15:43:22 +0200954
955 memset(tx, 0, sizeof(*tx));
956 tx->skb = skb;
957 tx->dev = dev; /* use original interface */
958 tx->local = local;
959 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Berge039fa42008-05-15 12:55:29 +0200960 tx->channel = local->hw.conf.channel;
Johannes Berge2ebc742007-07-27 15:43:22 +0200961 /*
Johannes Berg58d41852007-09-26 17:53:18 +0200962 * Set this flag (used below to indicate "automatic fragmentation"),
963 * it will be cleared/left by radiotap as desired.
Johannes Berge2ebc742007-07-27 15:43:22 +0200964 */
Johannes Berg5cf121c2008-02-25 16:27:43 +0100965 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +0200966
967 /* process and remove the injection radiotap header */
968 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Berg25d834e2008-09-12 22:52:47 +0200969 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
Johannes Berg9ae54c82008-01-31 19:48:20 +0100970 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
971 return TX_DROP;
Johannes Berg58d41852007-09-26 17:53:18 +0200972
Johannes Berge2ebc742007-07-27 15:43:22 +0200973 /*
Johannes Berg58d41852007-09-26 17:53:18 +0200974 * __ieee80211_parse_tx_radiotap has now removed
975 * the radiotap header that was present and pre-filled
976 * 'tx' with tx control information.
Johannes Berge2ebc742007-07-27 15:43:22 +0200977 */
Johannes Berge2ebc742007-07-27 15:43:22 +0200978 }
979
Johannes Berg58d41852007-09-26 17:53:18 +0200980 hdr = (struct ieee80211_hdr *) skb->data;
981
warmcat24338792007-09-14 11:10:25 -0400982 tx->sta = sta_info_get(local, hdr->addr1);
Johannes Berg58d41852007-09-26 17:53:18 +0200983
Sujith8b30b1f2008-10-24 09:55:27 +0530984 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control)) {
985 qc = ieee80211_get_qos_ctl(hdr);
986 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
987
988 state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
989 if (*state == HT_AGG_STATE_OPERATIONAL)
990 info->flags |= IEEE80211_TX_CTL_AMPDU;
991 }
992
Jiri Slabybadffb72007-08-28 17:01:54 -0400993 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100994 tx->flags &= ~IEEE80211_TX_UNICAST;
Johannes Berge039fa42008-05-15 12:55:29 +0200995 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -0400996 } else {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100997 tx->flags |= IEEE80211_TX_UNICAST;
Johannes Berge039fa42008-05-15 12:55:29 +0200998 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -0400999 }
Johannes Berg58d41852007-09-26 17:53:18 +02001000
Johannes Berg5cf121c2008-02-25 16:27:43 +01001001 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1002 if ((tx->flags & IEEE80211_TX_UNICAST) &&
Johannes Berg58d41852007-09-26 17:53:18 +02001003 skb->len + FCS_LEN > local->fragmentation_threshold &&
Ron Rindjunsky8d5e0d52008-06-12 15:42:29 +03001004 !(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Berg5cf121c2008-02-25 16:27:43 +01001005 tx->flags |= IEEE80211_TX_FRAGMENTED;
Johannes Berg58d41852007-09-26 17:53:18 +02001006 else
Johannes Berg5cf121c2008-02-25 16:27:43 +01001007 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
Johannes Berg58d41852007-09-26 17:53:18 +02001008 }
1009
Johannes Berge2ebc742007-07-27 15:43:22 +02001010 if (!tx->sta)
Johannes Berge039fa42008-05-15 12:55:29 +02001011 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Berg07346f812008-05-03 01:02:02 +02001012 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
Johannes Berge039fa42008-05-15 12:55:29 +02001013 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
Johannes Berg58d41852007-09-26 17:53:18 +02001014
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001015 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berge2ebc742007-07-27 15:43:22 +02001016 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1017 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1018 tx->ethertype = (pos[0] << 8) | pos[1];
1019 }
Johannes Berge039fa42008-05-15 12:55:29 +02001020 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
Johannes Berge2ebc742007-07-27 15:43:22 +02001021
Johannes Berg9ae54c82008-01-31 19:48:20 +01001022 return TX_CONTINUE;
Johannes Berge2ebc742007-07-27 15:43:22 +02001023}
1024
Johannes Berg32bfd352007-12-19 01:31:26 +01001025/*
Johannes Berg58d41852007-09-26 17:53:18 +02001026 * NB: @tx is uninitialised when passed in here
1027 */
Johannes Berg133b8222008-09-16 14:18:59 +02001028static int ieee80211_tx_prepare(struct ieee80211_local *local,
1029 struct ieee80211_tx_data *tx,
1030 struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001031{
Johannes Berge2ebc742007-07-27 15:43:22 +02001032 struct net_device *dev;
1033
Johannes Bergd0f09802008-07-29 11:32:07 +02001034 dev = dev_get_by_index(&init_net, skb->iif);
Johannes Berg133b8222008-09-16 14:18:59 +02001035 if (unlikely(dev && !is_ieee80211_device(local, dev))) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001036 dev_put(dev);
1037 dev = NULL;
1038 }
1039 if (unlikely(!dev))
1040 return -ENODEV;
Johannes Berg58d41852007-09-26 17:53:18 +02001041 /* initialises tx with control */
Johannes Berge039fa42008-05-15 12:55:29 +02001042 __ieee80211_tx_prepare(tx, skb, dev);
Johannes Berg32bfd352007-12-19 01:31:26 +01001043 dev_put(dev);
Johannes Berge2ebc742007-07-27 15:43:22 +02001044 return 0;
1045}
1046
1047static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
Johannes Berg5cf121c2008-02-25 16:27:43 +01001048 struct ieee80211_tx_data *tx)
Johannes Berge2ebc742007-07-27 15:43:22 +02001049{
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001050 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02001051 int ret, i;
1052
Johannes Berge2ebc742007-07-27 15:43:22 +02001053 if (skb) {
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001054 if (netif_subqueue_stopped(local->mdev, skb))
1055 return IEEE80211_TX_AGAIN;
1056 info = IEEE80211_SKB_CB(skb);
1057
Johannes Berge039fa42008-05-15 12:55:29 +02001058 ret = local->ops->tx(local_to_hw(local), skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001059 if (ret)
1060 return IEEE80211_TX_AGAIN;
1061 local->mdev->trans_start = jiffies;
1062 ieee80211_led_tx(local, 1);
1063 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001064 if (tx->extra_frag) {
Johannes Berg5cf121c2008-02-25 16:27:43 +01001065 for (i = 0; i < tx->num_extra_frag; i++) {
1066 if (!tx->extra_frag[i])
Johannes Berge2ebc742007-07-27 15:43:22 +02001067 continue;
Johannes Berge039fa42008-05-15 12:55:29 +02001068 info = IEEE80211_SKB_CB(tx->extra_frag[i]);
Johannes Berge6a98542008-10-21 12:40:02 +02001069 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
Johannes Berge039fa42008-05-15 12:55:29 +02001070 IEEE80211_TX_CTL_FIRST_FRAGMENT);
Johannes Berge2530082008-05-17 00:57:14 +02001071 if (netif_subqueue_stopped(local->mdev,
1072 tx->extra_frag[i]))
Johannes Berge2ebc742007-07-27 15:43:22 +02001073 return IEEE80211_TX_FRAG_AGAIN;
Johannes Berge2ebc742007-07-27 15:43:22 +02001074
Johannes Berge2ebc742007-07-27 15:43:22 +02001075 ret = local->ops->tx(local_to_hw(local),
Johannes Berge039fa42008-05-15 12:55:29 +02001076 tx->extra_frag[i]);
Johannes Berge2ebc742007-07-27 15:43:22 +02001077 if (ret)
1078 return IEEE80211_TX_FRAG_AGAIN;
1079 local->mdev->trans_start = jiffies;
1080 ieee80211_led_tx(local, 1);
Johannes Berg5cf121c2008-02-25 16:27:43 +01001081 tx->extra_frag[i] = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +02001082 }
Johannes Berg5cf121c2008-02-25 16:27:43 +01001083 kfree(tx->extra_frag);
1084 tx->extra_frag = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +02001085 }
1086 return IEEE80211_TX_OK;
1087}
1088
Johannes Berg97b045d2008-06-20 01:22:30 +02001089/*
1090 * Invoke TX handlers, return 0 on success and non-zero if the
1091 * frame was dropped or queued.
1092 */
1093static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1094{
Johannes Berg97b045d2008-06-20 01:22:30 +02001095 struct sk_buff *skb = tx->skb;
Johannes Berg97b045d2008-06-20 01:22:30 +02001096 ieee80211_tx_result res = TX_DROP;
1097 int i;
1098
Johannes Bergd9e8a702008-06-30 15:10:44 +02001099#define CALL_TXH(txh) \
1100 res = txh(tx); \
1101 if (res != TX_CONTINUE) \
1102 goto txh_done;
Johannes Berg97b045d2008-06-20 01:22:30 +02001103
Johannes Bergd9e8a702008-06-30 15:10:44 +02001104 CALL_TXH(ieee80211_tx_h_check_assoc)
Johannes Bergd9e8a702008-06-30 15:10:44 +02001105 CALL_TXH(ieee80211_tx_h_ps_buf)
1106 CALL_TXH(ieee80211_tx_h_select_key)
1107 CALL_TXH(ieee80211_tx_h_michael_mic_add)
1108 CALL_TXH(ieee80211_tx_h_rate_ctrl)
1109 CALL_TXH(ieee80211_tx_h_misc)
Johannes Bergf591fa52008-07-10 11:21:26 +02001110 CALL_TXH(ieee80211_tx_h_sequence)
Johannes Bergd9e8a702008-06-30 15:10:44 +02001111 CALL_TXH(ieee80211_tx_h_fragment)
1112 /* handlers after fragment must be aware of tx info fragmentation! */
1113 CALL_TXH(ieee80211_tx_h_encrypt)
1114 CALL_TXH(ieee80211_tx_h_calculate_duration)
1115 CALL_TXH(ieee80211_tx_h_stats)
1116#undef CALL_TXH
1117
1118 txh_done:
Johannes Berg97b045d2008-06-20 01:22:30 +02001119 if (unlikely(res == TX_DROP)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001120 I802_DEBUG_INC(tx->local->tx_handlers_drop);
Johannes Berg97b045d2008-06-20 01:22:30 +02001121 dev_kfree_skb(skb);
1122 for (i = 0; i < tx->num_extra_frag; i++)
1123 if (tx->extra_frag[i])
1124 dev_kfree_skb(tx->extra_frag[i]);
1125 kfree(tx->extra_frag);
1126 return -1;
1127 } else if (unlikely(res == TX_QUEUED)) {
Tomas Winkler5479d0e2008-06-28 03:15:03 +03001128 I802_DEBUG_INC(tx->local->tx_handlers_queued);
Johannes Berg97b045d2008-06-20 01:22:30 +02001129 return -1;
1130 }
1131
1132 return 0;
1133}
1134
Johannes Berge039fa42008-05-15 12:55:29 +02001135static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb)
Johannes Berge2ebc742007-07-27 15:43:22 +02001136{
1137 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1138 struct sta_info *sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001139 struct ieee80211_tx_data tx;
Johannes Berg97b045d2008-06-20 01:22:30 +02001140 ieee80211_tx_result res_prepare;
Johannes Berge039fa42008-05-15 12:55:29 +02001141 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001142 int ret, i;
Johannes Berge2530082008-05-17 00:57:14 +02001143 u16 queue;
Johannes Berge2ebc742007-07-27 15:43:22 +02001144
Johannes Berge2530082008-05-17 00:57:14 +02001145 queue = skb_get_queue_mapping(skb);
1146
1147 WARN_ON(test_bit(queue, local->queues_pending));
Johannes Berge2ebc742007-07-27 15:43:22 +02001148
1149 if (unlikely(skb->len < 10)) {
1150 dev_kfree_skb(skb);
1151 return 0;
1152 }
1153
Johannes Bergd0709a62008-02-25 16:27:46 +01001154 rcu_read_lock();
1155
Johannes Berg58d41852007-09-26 17:53:18 +02001156 /* initialises tx */
Johannes Berge039fa42008-05-15 12:55:29 +02001157 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev);
Johannes Berge2ebc742007-07-27 15:43:22 +02001158
Johannes Berg9ae54c82008-01-31 19:48:20 +01001159 if (res_prepare == TX_DROP) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001160 dev_kfree_skb(skb);
Johannes Bergd0709a62008-02-25 16:27:46 +01001161 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001162 return 0;
1163 }
1164
1165 sta = tx.sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001166 tx.channel = local->hw.conf.channel;
Johannes Berge039fa42008-05-15 12:55:29 +02001167 info->band = tx.channel->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02001168
Johannes Berg97b045d2008-06-20 01:22:30 +02001169 if (invoke_tx_handlers(&tx))
1170 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02001171
Johannes Berge2ebc742007-07-27 15:43:22 +02001172retry:
1173 ret = __ieee80211_tx(local, skb, &tx);
1174 if (ret) {
Johannes Bergeefce912008-05-17 00:57:13 +02001175 struct ieee80211_tx_stored_packet *store;
1176
1177 /*
1178 * Since there are no fragmented frames on A-MPDU
1179 * queues, there's no reason for a driver to reject
1180 * a frame there, warn and drop it.
1181 */
Sujith8b30b1f2008-10-24 09:55:27 +05301182 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
Johannes Bergeefce912008-05-17 00:57:13 +02001183 goto drop;
1184
1185 store = &local->pending_packet[queue];
Johannes Berge2ebc742007-07-27 15:43:22 +02001186
1187 if (ret == IEEE80211_TX_FRAG_AGAIN)
1188 skb = NULL;
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001189
Johannes Berge2530082008-05-17 00:57:14 +02001190 set_bit(queue, local->queues_pending);
Johannes Berge2ebc742007-07-27 15:43:22 +02001191 smp_mb();
Johannes Berge2530082008-05-17 00:57:14 +02001192 /*
1193 * When the driver gets out of buffers during sending of
1194 * fragments and calls ieee80211_stop_queue, the netif
1195 * subqueue is stopped. There is, however, a small window
1196 * in which the PENDING bit is not yet set. If a buffer
Johannes Berge2ebc742007-07-27 15:43:22 +02001197 * gets available in that window (i.e. driver calls
1198 * ieee80211_wake_queue), we would end up with ieee80211_tx
Johannes Berge2530082008-05-17 00:57:14 +02001199 * called with the PENDING bit still set. Prevent this by
Johannes Berge2ebc742007-07-27 15:43:22 +02001200 * continuing transmitting here when that situation is
Johannes Berge2530082008-05-17 00:57:14 +02001201 * possible to have happened.
1202 */
1203 if (!__netif_subqueue_stopped(local->mdev, queue)) {
1204 clear_bit(queue, local->queues_pending);
Johannes Berge2ebc742007-07-27 15:43:22 +02001205 goto retry;
1206 }
Johannes Berge2ebc742007-07-27 15:43:22 +02001207 store->skb = skb;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001208 store->extra_frag = tx.extra_frag;
1209 store->num_extra_frag = tx.num_extra_frag;
Johannes Berge2ebc742007-07-27 15:43:22 +02001210 }
Johannes Berg97b045d2008-06-20 01:22:30 +02001211 out:
Johannes Bergd4e46a32007-09-14 11:10:24 -04001212 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001213 return 0;
1214
1215 drop:
1216 if (skb)
1217 dev_kfree_skb(skb);
Johannes Berg5cf121c2008-02-25 16:27:43 +01001218 for (i = 0; i < tx.num_extra_frag; i++)
1219 if (tx.extra_frag[i])
1220 dev_kfree_skb(tx.extra_frag[i]);
1221 kfree(tx.extra_frag);
Johannes Bergd4e46a32007-09-14 11:10:24 -04001222 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001223 return 0;
1224}
1225
1226/* device xmit handlers */
1227
Johannes Berg23c07522008-05-29 10:38:53 +02001228static int ieee80211_skb_resize(struct ieee80211_local *local,
1229 struct sk_buff *skb,
1230 int head_need, bool may_encrypt)
1231{
1232 int tail_need = 0;
1233
1234 /*
1235 * This could be optimised, devices that do full hardware
1236 * crypto (including TKIP MMIC) need no tailroom... But we
1237 * have no drivers for such devices currently.
1238 */
1239 if (may_encrypt) {
1240 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1241 tail_need -= skb_tailroom(skb);
1242 tail_need = max_t(int, tail_need, 0);
1243 }
1244
1245 if (head_need || tail_need) {
1246 /* Sorry. Can't account for this any more */
1247 skb_orphan(skb);
1248 }
1249
1250 if (skb_header_cloned(skb))
1251 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1252 else
1253 I802_DEBUG_INC(local->tx_expand_skb_head);
1254
1255 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1256 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
1257 wiphy_name(local->hw.wiphy));
1258 return -ENOMEM;
1259 }
1260
1261 /* update truesize too */
1262 skb->truesize += head_need + tail_need;
1263
1264 return 0;
1265}
1266
Tomas Winkler8ef9dad2008-09-27 22:58:18 +03001267int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
Johannes Berge2ebc742007-07-27 15:43:22 +02001268{
Johannes Berg133b8222008-09-16 14:18:59 +02001269 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
1270 struct ieee80211_local *local = mpriv->local;
Johannes Berge039fa42008-05-15 12:55:29 +02001271 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berge2ebc742007-07-27 15:43:22 +02001273 struct net_device *odev = NULL;
1274 struct ieee80211_sub_if_data *osdata;
1275 int headroom;
Johannes Berg23c07522008-05-29 10:38:53 +02001276 bool may_encrypt;
Johannes Berg25d834e2008-09-12 22:52:47 +02001277 enum {
1278 NOT_MONITOR,
1279 FOUND_SDATA,
1280 UNKNOWN_ADDRESS,
1281 } monitor_iface = NOT_MONITOR;
Johannes Berge2ebc742007-07-27 15:43:22 +02001282 int ret;
1283
Johannes Bergd0f09802008-07-29 11:32:07 +02001284 if (skb->iif)
1285 odev = dev_get_by_index(&init_net, skb->iif);
Johannes Berg133b8222008-09-16 14:18:59 +02001286 if (unlikely(odev && !is_ieee80211_device(local, odev))) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001287 dev_put(odev);
1288 odev = NULL;
1289 }
1290 if (unlikely(!odev)) {
1291#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1292 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1293 "originating device\n", dev->name);
1294#endif
1295 dev_kfree_skb(skb);
1296 return 0;
1297 }
Johannes Berge039fa42008-05-15 12:55:29 +02001298
Johannes Bergd0f09802008-07-29 11:32:07 +02001299 memset(info, 0, sizeof(*info));
1300
1301 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1302
Johannes Berge2ebc742007-07-27 15:43:22 +02001303 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1304
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001305 if (ieee80211_vif_is_mesh(&osdata->vif) &&
1306 ieee80211_is_data(hdr->frame_control)) {
Rami Rosenf74b6a52008-10-02 16:48:22 +03001307 if (is_multicast_ether_addr(hdr->addr3))
1308 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1309 else
1310 if (mesh_nexthop_lookup(skb, osdata))
1311 return 0;
1312 if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0)
1313 IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh,
1314 fwded_frames);
Johannes Berg25d834e2008-09-12 22:52:47 +02001315 } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1316 struct ieee80211_sub_if_data *sdata;
Johannes Berg25d834e2008-09-12 22:52:47 +02001317 int hdrlen;
1318 u16 len_rthdr;
1319
1320 info->flags |= IEEE80211_TX_CTL_INJECTED;
1321 monitor_iface = UNKNOWN_ADDRESS;
1322
1323 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1324 hdr = (struct ieee80211_hdr *)skb->data + len_rthdr;
1325 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1326
1327 /* check the header is complete in the frame */
1328 if (likely(skb->len >= len_rthdr + hdrlen)) {
1329 /*
1330 * We process outgoing injected frames that have a
1331 * local address we handle as though they are our
1332 * own frames.
1333 * This code here isn't entirely correct, the local
1334 * MAC address is not necessarily enough to find
1335 * the interface to use; for that proper VLAN/WDS
1336 * support we will need a different mechanism.
1337 */
1338
1339 rcu_read_lock();
1340 list_for_each_entry_rcu(sdata, &local->interfaces,
1341 list) {
1342 if (!netif_running(sdata->dev))
1343 continue;
1344 if (compare_ether_addr(sdata->dev->dev_addr,
1345 hdr->addr2)) {
1346 dev_hold(sdata->dev);
1347 dev_put(odev);
1348 osdata = sdata;
1349 odev = osdata->dev;
1350 skb->iif = sdata->dev->ifindex;
1351 monitor_iface = FOUND_SDATA;
1352 break;
1353 }
1354 }
1355 rcu_read_unlock();
1356 }
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001357 }
1358
Johannes Bergd0f09802008-07-29 11:32:07 +02001359 may_encrypt = !skb->do_not_encrypt;
Johannes Berg23c07522008-05-29 10:38:53 +02001360
1361 headroom = osdata->local->tx_headroom;
1362 if (may_encrypt)
1363 headroom += IEEE80211_ENCRYPT_HEADROOM;
1364 headroom -= skb_headroom(skb);
1365 headroom = max_t(int, 0, headroom);
1366
1367 if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) {
1368 dev_kfree_skb(skb);
1369 dev_put(odev);
1370 return 0;
Johannes Berge2ebc742007-07-27 15:43:22 +02001371 }
1372
Johannes Berg30613072008-09-11 05:27:40 +02001373 if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1374 osdata = container_of(osdata->bss,
1375 struct ieee80211_sub_if_data,
1376 u.ap);
Johannes Berg25d834e2008-09-12 22:52:47 +02001377 if (likely(monitor_iface != UNKNOWN_ADDRESS))
1378 info->control.vif = &osdata->vif;
Johannes Berge039fa42008-05-15 12:55:29 +02001379 ret = ieee80211_tx(odev, skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001380 dev_put(odev);
1381
1382 return ret;
1383}
1384
1385int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1386 struct net_device *dev)
1387{
1388 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001389 struct ieee80211_radiotap_header *prthdr =
1390 (struct ieee80211_radiotap_header *)skb->data;
Andy Green9b8a74e2007-07-27 15:43:24 +02001391 u16 len_rthdr;
Johannes Berge2ebc742007-07-27 15:43:22 +02001392
Andy Green9b8a74e2007-07-27 15:43:24 +02001393 /* check for not even having the fixed radiotap header part */
1394 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1395 goto fail; /* too short to be possibly valid */
1396
1397 /* is it a header version we can trust to find length from? */
1398 if (unlikely(prthdr->it_version))
1399 goto fail; /* only version 0 is supported */
1400
1401 /* then there must be a radiotap header with a length we can use */
1402 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1403
1404 /* does the skb contain enough to deliver on the alleged length? */
1405 if (unlikely(skb->len < len_rthdr))
1406 goto fail; /* skb too short for claimed rt header extent */
Johannes Berge2ebc742007-07-27 15:43:22 +02001407
1408 skb->dev = local->mdev;
1409
Andy Green9b8a74e2007-07-27 15:43:24 +02001410 /* needed because we set skb device to master */
Johannes Bergd0f09802008-07-29 11:32:07 +02001411 skb->iif = dev->ifindex;
Andy Green9b8a74e2007-07-27 15:43:24 +02001412
Johannes Bergd0f09802008-07-29 11:32:07 +02001413 /* sometimes we do encrypt injected frames, will be fixed
1414 * up in radiotap parser if not wanted */
1415 skb->do_not_encrypt = 0;
Johannes Berge2ebc742007-07-27 15:43:22 +02001416
Johannes Berge2ebc742007-07-27 15:43:22 +02001417 /*
1418 * fix up the pointers accounting for the radiotap
1419 * header still being in there. We are being given
1420 * a precooked IEEE80211 header so no need for
1421 * normal processing
1422 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001423 skb_set_mac_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001424 /*
Andy Green9b8a74e2007-07-27 15:43:24 +02001425 * these are just fixed to the end of the rt area since we
1426 * don't have any better information and at this point, nobody cares
Johannes Berge2ebc742007-07-27 15:43:22 +02001427 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001428 skb_set_network_header(skb, len_rthdr);
1429 skb_set_transport_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001430
Andy Green9b8a74e2007-07-27 15:43:24 +02001431 /* pass the radiotap header up to the next stage intact */
1432 dev_queue_xmit(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001433 return NETDEV_TX_OK;
Andy Green9b8a74e2007-07-27 15:43:24 +02001434
1435fail:
1436 dev_kfree_skb(skb);
1437 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
Johannes Berge2ebc742007-07-27 15:43:22 +02001438}
1439
1440/**
1441 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1442 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1443 * @skb: packet to be sent
1444 * @dev: incoming interface
1445 *
1446 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1447 * not be freed, and caller is responsible for either retrying later or freeing
1448 * skb).
1449 *
1450 * This function takes in an Ethernet header and encapsulates it with suitable
1451 * IEEE 802.11 header based on which interface the packet is coming in. The
1452 * encapsulated packet will then be passed to master interface, wlan#.11, for
1453 * transmission (through low-level driver).
1454 */
1455int ieee80211_subif_start_xmit(struct sk_buff *skb,
1456 struct net_device *dev)
1457{
Johannes Berg133b8222008-09-16 14:18:59 +02001458 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1459 struct ieee80211_local *local = sdata->local;
Johannes Berge2ebc742007-07-27 15:43:22 +02001460 int ret = 1, head_need;
Harvey Harrison065e96052008-06-22 16:45:27 -07001461 u16 ethertype, hdrlen, meshhdrlen = 0;
1462 __le16 fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001463 struct ieee80211_hdr hdr;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001464 struct ieee80211s_hdr mesh_hdr;
Johannes Berge2ebc742007-07-27 15:43:22 +02001465 const u8 *encaps_data;
1466 int encaps_len, skip_header_bytes;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001467 int nh_pos, h_pos;
Johannes Berge2ebc742007-07-27 15:43:22 +02001468 struct sta_info *sta;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001469 u32 sta_flags = 0;
Johannes Berge2ebc742007-07-27 15:43:22 +02001470
Johannes Berge2ebc742007-07-27 15:43:22 +02001471 if (unlikely(skb->len < ETH_HLEN)) {
Johannes Berge2ebc742007-07-27 15:43:22 +02001472 ret = 0;
1473 goto fail;
1474 }
1475
1476 nh_pos = skb_network_header(skb) - skb->data;
1477 h_pos = skb_transport_header(skb) - skb->data;
1478
1479 /* convert Ethernet header to proper 802.11 header (based on
1480 * operation mode) */
1481 ethertype = (skb->data[12] << 8) | skb->data[13];
Harvey Harrison065e96052008-06-22 16:45:27 -07001482 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
Johannes Berge2ebc742007-07-27 15:43:22 +02001483
Johannes Berg51fb61e2007-12-19 01:31:27 +01001484 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02001485 case NL80211_IFTYPE_AP:
1486 case NL80211_IFTYPE_AP_VLAN:
Harvey Harrison065e96052008-06-22 16:45:27 -07001487 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001488 /* DA BSSID SA */
1489 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1490 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1491 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1492 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001493 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001494 case NL80211_IFTYPE_WDS:
Harvey Harrison065e96052008-06-22 16:45:27 -07001495 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001496 /* RA TA DA SA */
1497 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1498 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1499 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1500 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1501 hdrlen = 30;
Johannes Bergcf966832007-08-28 17:01:54 -04001502 break;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001503#ifdef CONFIG_MAC80211_MESH
Johannes Berg05c914f2008-09-11 00:01:58 +02001504 case NL80211_IFTYPE_MESH_POINT:
Harvey Harrison065e96052008-06-22 16:45:27 -07001505 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Johannes Berg472dbc42008-09-11 00:01:49 +02001506 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001507 /* Do not send frames with mesh_ttl == 0 */
Johannes Berg472dbc42008-09-11 00:01:49 +02001508 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001509 ret = 0;
1510 goto fail;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001511 }
YanBo79617de2008-09-22 13:30:32 +08001512 memset(&mesh_hdr, 0, sizeof(mesh_hdr));
1513
1514 if (compare_ether_addr(dev->dev_addr,
1515 skb->data + ETH_ALEN) == 0) {
1516 /* RA TA DA SA */
1517 memset(hdr.addr1, 0, ETH_ALEN);
1518 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1519 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1520 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1521 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata);
1522 } else {
1523 /* packet from other interface */
1524 struct mesh_path *mppath;
1525
1526 memset(hdr.addr1, 0, ETH_ALEN);
1527 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1528 memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN);
1529
1530 if (is_multicast_ether_addr(skb->data))
1531 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1532 else {
1533 rcu_read_lock();
1534 mppath = mpp_path_lookup(skb->data, sdata);
1535 if (mppath)
1536 memcpy(hdr.addr3, mppath->mpp, ETH_ALEN);
1537 else
1538 memset(hdr.addr3, 0xff, ETH_ALEN);
1539 rcu_read_unlock();
1540 }
1541
1542 mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6;
1543 mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
1544 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum);
1545 memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN);
1546 memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN);
1547 sdata->u.mesh.mesh_seqnum++;
1548 meshhdrlen = 18;
1549 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001550 hdrlen = 30;
1551 break;
1552#endif
Johannes Berg05c914f2008-09-11 00:01:58 +02001553 case NL80211_IFTYPE_STATION:
Harvey Harrison065e96052008-06-22 16:45:27 -07001554 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
Johannes Berge2ebc742007-07-27 15:43:22 +02001555 /* BSSID SA DA */
1556 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1557 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1558 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1559 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001560 break;
Johannes Berg05c914f2008-09-11 00:01:58 +02001561 case NL80211_IFTYPE_ADHOC:
Johannes Berge2ebc742007-07-27 15:43:22 +02001562 /* DA SA BSSID */
1563 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1564 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1565 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1566 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001567 break;
1568 default:
Johannes Berge2ebc742007-07-27 15:43:22 +02001569 ret = 0;
1570 goto fail;
1571 }
1572
Johannes Berg7d185b82008-01-28 17:11:43 +01001573 /*
1574 * There's no need to try to look up the destination
1575 * if it is a multicast address (which can only happen
1576 * in AP mode)
1577 */
1578 if (!is_multicast_ether_addr(hdr.addr1)) {
Johannes Bergd0709a62008-02-25 16:27:46 +01001579 rcu_read_lock();
Johannes Berg7d185b82008-01-28 17:11:43 +01001580 sta = sta_info_get(local, hdr.addr1);
Johannes Bergd0709a62008-02-25 16:27:46 +01001581 if (sta)
Johannes Berg07346f812008-05-03 01:02:02 +02001582 sta_flags = get_sta_flags(sta);
Johannes Bergd0709a62008-02-25 16:27:46 +01001583 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001584 }
1585
Johannes Berg3434fbd2008-05-03 00:59:37 +02001586 /* receiver and we are QoS enabled, use a QoS type frame */
Johannes Berge2530082008-05-17 00:57:14 +02001587 if (sta_flags & WLAN_STA_WME &&
1588 ieee80211_num_regular_queues(&local->hw) >= 4) {
Harvey Harrison065e96052008-06-22 16:45:27 -07001589 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001590 hdrlen += 2;
1591 }
1592
1593 /*
Johannes Berg238814f2008-01-28 17:19:37 +01001594 * Drop unicast frames to unauthorised stations unless they are
1595 * EAPOL frames from the local station.
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001596 */
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001597 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1598 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001599 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1600 !(ethertype == ETH_P_PAE &&
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001601 compare_ether_addr(dev->dev_addr,
1602 skb->data + ETH_ALEN) == 0))) {
1603#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001604 if (net_ratelimit())
Johannes Berg0c68ae262008-10-27 15:56:10 -07001605 printk(KERN_DEBUG "%s: dropped frame to %pM"
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001606 " (unauthorized port)\n", dev->name,
Johannes Berg0c68ae262008-10-27 15:56:10 -07001607 hdr.addr1);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01001608#endif
1609
1610 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1611
1612 ret = 0;
1613 goto fail;
1614 }
1615
Harvey Harrison065e96052008-06-22 16:45:27 -07001616 hdr.frame_control = fc;
Johannes Berge2ebc742007-07-27 15:43:22 +02001617 hdr.duration_id = 0;
1618 hdr.seq_ctrl = 0;
1619
1620 skip_header_bytes = ETH_HLEN;
1621 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1622 encaps_data = bridge_tunnel_header;
1623 encaps_len = sizeof(bridge_tunnel_header);
1624 skip_header_bytes -= 2;
1625 } else if (ethertype >= 0x600) {
1626 encaps_data = rfc1042_header;
1627 encaps_len = sizeof(rfc1042_header);
1628 skip_header_bytes -= 2;
1629 } else {
1630 encaps_data = NULL;
1631 encaps_len = 0;
1632 }
1633
1634 skb_pull(skb, skip_header_bytes);
1635 nh_pos -= skip_header_bytes;
1636 h_pos -= skip_header_bytes;
1637
Johannes Berg23c07522008-05-29 10:38:53 +02001638 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001639
Johannes Berg23c07522008-05-29 10:38:53 +02001640 /*
1641 * So we need to modify the skb header and hence need a copy of
1642 * that. The head_need variable above doesn't, so far, include
1643 * the needed header space that we don't need right away. If we
1644 * can, then we don't reallocate right now but only after the
1645 * frame arrives at the master device (if it does...)
1646 *
1647 * If we cannot, however, then we will reallocate to include all
1648 * the ever needed space. Also, if we need to reallocate it anyway,
1649 * make it big enough for everything we may ever need.
1650 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001651
David S. Miller3a5be7d2008-06-18 01:19:51 -07001652 if (head_need > 0 || skb_cloned(skb)) {
Johannes Berg23c07522008-05-29 10:38:53 +02001653 head_need += IEEE80211_ENCRYPT_HEADROOM;
1654 head_need += local->tx_headroom;
1655 head_need = max_t(int, 0, head_need);
1656 if (ieee80211_skb_resize(local, skb, head_need, true))
Johannes Berge2ebc742007-07-27 15:43:22 +02001657 goto fail;
Johannes Berge2ebc742007-07-27 15:43:22 +02001658 }
1659
1660 if (encaps_data) {
1661 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1662 nh_pos += encaps_len;
1663 h_pos += encaps_len;
1664 }
Johannes Bergc29b9b92007-09-14 11:10:24 -04001665
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001666 if (meshhdrlen > 0) {
1667 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1668 nh_pos += meshhdrlen;
1669 h_pos += meshhdrlen;
1670 }
1671
Harvey Harrison065e96052008-06-22 16:45:27 -07001672 if (ieee80211_is_data_qos(fc)) {
Johannes Bergc29b9b92007-09-14 11:10:24 -04001673 __le16 *qos_control;
1674
1675 qos_control = (__le16*) skb_push(skb, 2);
1676 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1677 /*
1678 * Maybe we could actually set some fields here, for now just
1679 * initialise to zero to indicate no special operation.
1680 */
1681 *qos_control = 0;
1682 } else
1683 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1684
Johannes Berge2ebc742007-07-27 15:43:22 +02001685 nh_pos += hdrlen;
1686 h_pos += hdrlen;
1687
Johannes Bergd0f09802008-07-29 11:32:07 +02001688 skb->iif = dev->ifindex;
Ivo van Doornb0a67172008-05-13 15:03:02 +02001689
Johannes Berge2ebc742007-07-27 15:43:22 +02001690 skb->dev = local->mdev;
Stephen Hemminger68aae112007-08-24 11:29:34 -07001691 dev->stats.tx_packets++;
1692 dev->stats.tx_bytes += skb->len;
Johannes Berge2ebc742007-07-27 15:43:22 +02001693
1694 /* Update skb pointers to various headers since this modified frame
1695 * is going to go through Linux networking code that may potentially
1696 * need things like pointer to IP header. */
1697 skb_set_mac_header(skb, 0);
1698 skb_set_network_header(skb, nh_pos);
1699 skb_set_transport_header(skb, h_pos);
1700
1701 dev->trans_start = jiffies;
1702 dev_queue_xmit(skb);
1703
1704 return 0;
1705
1706 fail:
1707 if (!ret)
1708 dev_kfree_skb(skb);
1709
1710 return ret;
1711}
1712
Johannes Berge2ebc742007-07-27 15:43:22 +02001713
Johannes Berge2530082008-05-17 00:57:14 +02001714/*
1715 * ieee80211_clear_tx_pending may not be called in a context where
1716 * it is possible that it packets could come in again.
1717 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001718void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1719{
1720 int i, j;
1721 struct ieee80211_tx_stored_packet *store;
1722
Johannes Berge2530082008-05-17 00:57:14 +02001723 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1724 if (!test_bit(i, local->queues_pending))
Johannes Berge2ebc742007-07-27 15:43:22 +02001725 continue;
1726 store = &local->pending_packet[i];
1727 kfree_skb(store->skb);
1728 for (j = 0; j < store->num_extra_frag; j++)
1729 kfree_skb(store->extra_frag[j]);
1730 kfree(store->extra_frag);
Johannes Berge2530082008-05-17 00:57:14 +02001731 clear_bit(i, local->queues_pending);
Johannes Berge2ebc742007-07-27 15:43:22 +02001732 }
1733}
1734
Johannes Berge2530082008-05-17 00:57:14 +02001735/*
1736 * Transmit all pending packets. Called from tasklet, locks master device
1737 * TX lock so that no new packets can come in.
1738 */
Johannes Berge2ebc742007-07-27 15:43:22 +02001739void ieee80211_tx_pending(unsigned long data)
1740{
1741 struct ieee80211_local *local = (struct ieee80211_local *)data;
1742 struct net_device *dev = local->mdev;
1743 struct ieee80211_tx_stored_packet *store;
Johannes Berg5cf121c2008-02-25 16:27:43 +01001744 struct ieee80211_tx_data tx;
Johannes Berge2530082008-05-17 00:57:14 +02001745 int i, ret;
Johannes Berge2ebc742007-07-27 15:43:22 +02001746
1747 netif_tx_lock_bh(dev);
Johannes Berge2530082008-05-17 00:57:14 +02001748 for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) {
1749 /* Check that this queue is ok */
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001750 if (__netif_subqueue_stopped(local->mdev, i) &&
1751 !test_bit(i, local->queues_pending_run))
Johannes Berge2ebc742007-07-27 15:43:22 +02001752 continue;
Johannes Berge2530082008-05-17 00:57:14 +02001753
1754 if (!test_bit(i, local->queues_pending)) {
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001755 clear_bit(i, local->queues_pending_run);
Johannes Berge2530082008-05-17 00:57:14 +02001756 ieee80211_wake_queue(&local->hw, i);
Johannes Berge2ebc742007-07-27 15:43:22 +02001757 continue;
1758 }
Johannes Berge2530082008-05-17 00:57:14 +02001759
Tomas Winklerf8e79dd2008-07-24 18:46:44 +03001760 clear_bit(i, local->queues_pending_run);
1761 netif_start_subqueue(local->mdev, i);
1762
Johannes Berge2ebc742007-07-27 15:43:22 +02001763 store = &local->pending_packet[i];
Johannes Berg5cf121c2008-02-25 16:27:43 +01001764 tx.extra_frag = store->extra_frag;
1765 tx.num_extra_frag = store->num_extra_frag;
Jiri Slabybadffb72007-08-28 17:01:54 -04001766 tx.flags = 0;
Johannes Berge2ebc742007-07-27 15:43:22 +02001767 ret = __ieee80211_tx(local, store->skb, &tx);
1768 if (ret) {
1769 if (ret == IEEE80211_TX_FRAG_AGAIN)
1770 store->skb = NULL;
1771 } else {
Johannes Berge2530082008-05-17 00:57:14 +02001772 clear_bit(i, local->queues_pending);
1773 ieee80211_wake_queue(&local->hw, i);
Johannes Berge2ebc742007-07-27 15:43:22 +02001774 }
1775 }
1776 netif_tx_unlock_bh(dev);
Johannes Berge2ebc742007-07-27 15:43:22 +02001777}
1778
1779/* functions for drivers to get certain frames */
1780
Rami Rosen8e7be8d2008-12-01 13:56:55 +02001781static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001782 struct sk_buff *skb,
1783 struct beacon_data *beacon)
Johannes Berge2ebc742007-07-27 15:43:22 +02001784{
1785 u8 *pos, *tim;
1786 int aid0 = 0;
1787 int i, have_bits = 0, n1, n2;
1788
1789 /* Generate bitmap for TIM only if there are any STAs in power save
1790 * mode. */
Johannes Berge2ebc742007-07-27 15:43:22 +02001791 if (atomic_read(&bss->num_sta_ps) > 0)
1792 /* in the hope that this is faster than
1793 * checking byte-for-byte */
1794 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1795 IEEE80211_MAX_AID+1);
1796
1797 if (bss->dtim_count == 0)
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001798 bss->dtim_count = beacon->dtim_period - 1;
Johannes Berge2ebc742007-07-27 15:43:22 +02001799 else
1800 bss->dtim_count--;
1801
1802 tim = pos = (u8 *) skb_put(skb, 6);
1803 *pos++ = WLAN_EID_TIM;
1804 *pos++ = 4;
1805 *pos++ = bss->dtim_count;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001806 *pos++ = beacon->dtim_period;
Johannes Berge2ebc742007-07-27 15:43:22 +02001807
1808 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1809 aid0 = 1;
1810
1811 if (have_bits) {
1812 /* Find largest even number N1 so that bits numbered 1 through
1813 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1814 * (N2 + 1) x 8 through 2007 are 0. */
1815 n1 = 0;
1816 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1817 if (bss->tim[i]) {
1818 n1 = i & 0xfe;
1819 break;
1820 }
1821 }
1822 n2 = n1;
1823 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1824 if (bss->tim[i]) {
1825 n2 = i;
1826 break;
1827 }
1828 }
1829
1830 /* Bitmap control */
1831 *pos++ = n1 | aid0;
1832 /* Part Virt Bitmap */
1833 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1834
1835 tim[1] = n2 - n1 + 4;
1836 skb_put(skb, n2 - n1);
1837 } else {
1838 *pos++ = aid0; /* Bitmap control */
1839 *pos++ = 0; /* Part Virt Bitmap */
1840 }
Johannes Berge2ebc742007-07-27 15:43:22 +02001841}
1842
Johannes Berg32bfd352007-12-19 01:31:26 +01001843struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
Johannes Berge039fa42008-05-15 12:55:29 +02001844 struct ieee80211_vif *vif)
Johannes Berge2ebc742007-07-27 15:43:22 +02001845{
1846 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg9d139c82008-07-09 14:40:37 +02001847 struct sk_buff *skb = NULL;
Johannes Berge039fa42008-05-15 12:55:29 +02001848 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02001849 struct ieee80211_sub_if_data *sdata = NULL;
1850 struct ieee80211_if_ap *ap = NULL;
Johannes Berg9d139c82008-07-09 14:40:37 +02001851 struct ieee80211_if_sta *ifsta = NULL;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001852 struct beacon_data *beacon;
Johannes Berg8318d782008-01-24 19:38:38 +01001853 struct ieee80211_supported_band *sband;
Johannes Berg2e92e6f2008-05-15 12:55:27 +02001854 enum ieee80211_band band = local->hw.conf.channel->band;
Johannes Berg8318d782008-01-24 19:38:38 +01001855
Johannes Berg2e92e6f2008-05-15 12:55:27 +02001856 sband = local->hw.wiphy->bands[band];
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001857
1858 rcu_read_lock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001859
Johannes Berg32bfd352007-12-19 01:31:26 +01001860 sdata = vif_to_sdata(vif);
Johannes Berge2ebc742007-07-27 15:43:22 +02001861
Johannes Berg05c914f2008-09-11 00:01:58 +02001862 if (sdata->vif.type == NL80211_IFTYPE_AP) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001863 ap = &sdata->u.ap;
1864 beacon = rcu_dereference(ap->beacon);
Johannes Berg902acc72008-02-23 15:17:19 +01001865 if (ap && beacon) {
1866 /*
1867 * headroom, head length,
1868 * tail length and maximum TIM length
1869 */
1870 skb = dev_alloc_skb(local->tx_headroom +
1871 beacon->head_len +
1872 beacon->tail_len + 256);
1873 if (!skb)
1874 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001875
Johannes Berg902acc72008-02-23 15:17:19 +01001876 skb_reserve(skb, local->tx_headroom);
1877 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1878 beacon->head_len);
1879
Johannes Bergd0709a62008-02-25 16:27:46 +01001880 /*
1881 * Not very nice, but we want to allow the driver to call
1882 * ieee80211_beacon_get() as a response to the set_tim()
1883 * callback. That, however, is already invoked under the
1884 * sta_lock to guarantee consistent and race-free update
1885 * of the tim bitmap in mac80211 and the driver.
1886 */
1887 if (local->tim_in_locked_section) {
Rami Rosen8e7be8d2008-12-01 13:56:55 +02001888 ieee80211_beacon_add_tim(ap, skb, beacon);
Johannes Bergd0709a62008-02-25 16:27:46 +01001889 } else {
1890 unsigned long flags;
1891
1892 spin_lock_irqsave(&local->sta_lock, flags);
Rami Rosen8e7be8d2008-12-01 13:56:55 +02001893 ieee80211_beacon_add_tim(ap, skb, beacon);
Johannes Bergd0709a62008-02-25 16:27:46 +01001894 spin_unlock_irqrestore(&local->sta_lock, flags);
1895 }
Johannes Berg902acc72008-02-23 15:17:19 +01001896
1897 if (beacon->tail)
1898 memcpy(skb_put(skb, beacon->tail_len),
1899 beacon->tail, beacon->tail_len);
Johannes Berg9d139c82008-07-09 14:40:37 +02001900 } else
1901 goto out;
Johannes Berg05c914f2008-09-11 00:01:58 +02001902 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Johannes Berg9d139c82008-07-09 14:40:37 +02001903 struct ieee80211_hdr *hdr;
1904 ifsta = &sdata->u.sta;
Johannes Berg902acc72008-02-23 15:17:19 +01001905
Johannes Berg9d139c82008-07-09 14:40:37 +02001906 if (!ifsta->probe_resp)
1907 goto out;
1908
1909 skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1910 if (!skb)
1911 goto out;
1912
1913 hdr = (struct ieee80211_hdr *) skb->data;
Harvey Harrisone7827a72008-07-15 18:44:13 -07001914 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1915 IEEE80211_STYPE_BEACON);
Johannes Berg9d139c82008-07-09 14:40:37 +02001916
Johannes Berg902acc72008-02-23 15:17:19 +01001917 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
Johannes Berg472dbc42008-09-11 00:01:49 +02001918 struct ieee80211_mgmt *mgmt;
1919 u8 *pos;
1920
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001921 /* headroom, head length, tail length and maximum TIM length */
Johannes Berg902acc72008-02-23 15:17:19 +01001922 skb = dev_alloc_skb(local->tx_headroom + 400);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001923 if (!skb)
1924 goto out;
1925
Johannes Berg902acc72008-02-23 15:17:19 +01001926 skb_reserve(skb, local->hw.extra_tx_headroom);
1927 mgmt = (struct ieee80211_mgmt *)
1928 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1929 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
Harvey Harrison065e96052008-06-22 16:45:27 -07001930 mgmt->frame_control =
1931 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
Johannes Berg902acc72008-02-23 15:17:19 +01001932 memset(mgmt->da, 0xff, ETH_ALEN);
1933 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1934 /* BSSID is left zeroed, wildcard value */
1935 mgmt->u.beacon.beacon_int =
1936 cpu_to_le16(local->hw.conf.beacon_int);
1937 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001938
Johannes Berg902acc72008-02-23 15:17:19 +01001939 pos = skb_put(skb, 2);
1940 *pos++ = WLAN_EID_SSID;
1941 *pos++ = 0x0;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001942
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001943 mesh_mgmt_ies_add(skb, sdata);
Johannes Berg9d139c82008-07-09 14:40:37 +02001944 } else {
1945 WARN_ON(1);
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001946 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02001947 }
1948
Johannes Berge039fa42008-05-15 12:55:29 +02001949 info = IEEE80211_SKB_CB(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001950
Johannes Bergd0f09802008-07-29 11:32:07 +02001951 skb->do_not_encrypt = 1;
1952
Johannes Berge039fa42008-05-15 12:55:29 +02001953 info->band = band;
Johannes Berge6a98542008-10-21 12:40:02 +02001954 /*
1955 * XXX: For now, always use the lowest rate
1956 */
1957 info->control.rates[0].idx = 0;
1958 info->control.rates[0].count = 1;
1959 info->control.rates[1].idx = -1;
1960 info->control.rates[2].idx = -1;
1961 info->control.rates[3].idx = -1;
1962 info->control.rates[4].idx = -1;
1963 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
Johannes Berge039fa42008-05-15 12:55:29 +02001964
1965 info->control.vif = vif;
Johannes Bergf591fa52008-07-10 11:21:26 +02001966
1967 info->flags |= IEEE80211_TX_CTL_NO_ACK;
Johannes Bergf591fa52008-07-10 11:21:26 +02001968 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1969 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
Johannes Berge6a98542008-10-21 12:40:02 +02001970 out:
Johannes Berg5dfdaf52007-12-19 02:03:33 +01001971 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001972 return skb;
1973}
1974EXPORT_SYMBOL(ieee80211_beacon_get);
1975
Johannes Berg32bfd352007-12-19 01:31:26 +01001976void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02001977 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02001978 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02001979 struct ieee80211_rts *rts)
1980{
1981 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02001982
Harvey Harrison065e96052008-06-22 16:45:27 -07001983 rts->frame_control =
1984 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01001985 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1986 frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02001987 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1988 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1989}
1990EXPORT_SYMBOL(ieee80211_rts_get);
1991
Johannes Berg32bfd352007-12-19 01:31:26 +01001992void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
Johannes Berge2ebc742007-07-27 15:43:22 +02001993 const void *frame, size_t frame_len,
Johannes Berge039fa42008-05-15 12:55:29 +02001994 const struct ieee80211_tx_info *frame_txctl,
Johannes Berge2ebc742007-07-27 15:43:22 +02001995 struct ieee80211_cts *cts)
1996{
1997 const struct ieee80211_hdr *hdr = frame;
Johannes Berge2ebc742007-07-27 15:43:22 +02001998
Harvey Harrison065e96052008-06-22 16:45:27 -07001999 cts->frame_control =
2000 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
Johannes Berg32bfd352007-12-19 01:31:26 +01002001 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2002 frame_len, frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02002003 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2004}
2005EXPORT_SYMBOL(ieee80211_ctstoself_get);
2006
2007struct sk_buff *
Johannes Berg32bfd352007-12-19 01:31:26 +01002008ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
Johannes Berge039fa42008-05-15 12:55:29 +02002009 struct ieee80211_vif *vif)
Johannes Berge2ebc742007-07-27 15:43:22 +02002010{
2011 struct ieee80211_local *local = hw_to_local(hw);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002012 struct sk_buff *skb = NULL;
Johannes Berge2ebc742007-07-27 15:43:22 +02002013 struct sta_info *sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002014 struct ieee80211_tx_data tx;
Johannes Berge2ebc742007-07-27 15:43:22 +02002015 struct ieee80211_sub_if_data *sdata;
2016 struct ieee80211_if_ap *bss = NULL;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002017 struct beacon_data *beacon;
Johannes Berge039fa42008-05-15 12:55:29 +02002018 struct ieee80211_tx_info *info;
Johannes Berge2ebc742007-07-27 15:43:22 +02002019
Johannes Berg32bfd352007-12-19 01:31:26 +01002020 sdata = vif_to_sdata(vif);
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002021 bss = &sdata->u.ap;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002022
2023 if (!bss)
Johannes Berge2ebc742007-07-27 15:43:22 +02002024 return NULL;
2025
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002026 rcu_read_lock();
2027 beacon = rcu_dereference(bss->beacon);
2028
Johannes Berg05c914f2008-09-11 00:01:58 +02002029 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002030 goto out;
Johannes Berg5dfdaf52007-12-19 02:03:33 +01002031
Johannes Berge2ebc742007-07-27 15:43:22 +02002032 if (bss->dtim_count != 0)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002033 goto out; /* send buffered bc/mc only after DTIM beacon */
Johannes Berge039fa42008-05-15 12:55:29 +02002034
Johannes Berge2ebc742007-07-27 15:43:22 +02002035 while (1) {
2036 skb = skb_dequeue(&bss->ps_bc_buf);
2037 if (!skb)
Tomas Winkler747cf5e2008-05-27 17:50:51 +03002038 goto out;
Johannes Berge2ebc742007-07-27 15:43:22 +02002039 local->total_ps_buffered--;
2040
2041 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2042 struct ieee80211_hdr *hdr =
2043 (struct ieee80211_hdr *) skb->data;
2044 /* more buffered multicast/broadcast frames ==> set
2045 * MoreData flag in IEEE 802.11 header to inform PS
2046 * STAs */
2047 hdr->frame_control |=
2048 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2049 }
2050
Johannes Berg133b8222008-09-16 14:18:59 +02002051 if (!ieee80211_tx_prepare(local, &tx, skb))
Johannes Berge2ebc742007-07-27 15:43:22 +02002052 break;
2053 dev_kfree_skb_any(skb);
2054 }
Johannes Berge039fa42008-05-15 12:55:29 +02002055
2056 info = IEEE80211_SKB_CB(skb);
2057
Johannes Berge2ebc742007-07-27 15:43:22 +02002058 sta = tx.sta;
Johannes Berg5cf121c2008-02-25 16:27:43 +01002059 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2060 tx.channel = local->hw.conf.channel;
Johannes Berge039fa42008-05-15 12:55:29 +02002061 info->band = tx.channel->band;
Johannes Berge2ebc742007-07-27 15:43:22 +02002062
Johannes Berg97b045d2008-06-20 01:22:30 +02002063 if (invoke_tx_handlers(&tx))
Johannes Berge2ebc742007-07-27 15:43:22 +02002064 skb = NULL;
Johannes Berg97b045d2008-06-20 01:22:30 +02002065 out:
Johannes Bergd0709a62008-02-25 16:27:46 +01002066 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02002067
2068 return skb;
2069}
2070EXPORT_SYMBOL(ieee80211_get_buffered_bc);