blob: 04b4fa9c69ea6ab9442e7177595fd573367c2c77 [file] [log] [blame]
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"
28#include "ieee80211_led.h"
29#include "wep.h"
30#include "wpa.h"
31#include "wme.h"
32#include "ieee80211_rate.h"
33
34#define IEEE80211_TX_OK 0
35#define IEEE80211_TX_AGAIN 1
36#define IEEE80211_TX_FRAG_AGAIN 2
37
38/* misc utils */
39
40static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
41 struct ieee80211_hdr *hdr)
42{
43 /* Set the sequence number for this frame. */
44 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
45
46 /* Increase the sequence number. */
47 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
48}
49
50#ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51static void ieee80211_dump_frame(const char *ifname, const char *title,
52 const struct sk_buff *skb)
53{
54 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
55 u16 fc;
56 int hdrlen;
Joe Perches0795af52007-10-03 17:59:30 -070057 DECLARE_MAC_BUF(mac);
Johannes Berge2ebc742007-07-27 15:43:22 +020058
59 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
60 if (skb->len < 4) {
61 printk("\n");
62 return;
63 }
64
65 fc = le16_to_cpu(hdr->frame_control);
66 hdrlen = ieee80211_get_hdrlen(fc);
67 if (hdrlen > skb->len)
68 hdrlen = skb->len;
69 if (hdrlen >= 4)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc, le16_to_cpu(hdr->duration_id));
72 if (hdrlen >= 10)
Joe Perches0795af52007-10-03 17:59:30 -070073 printk(" A1=%s", print_mac(mac, hdr->addr1));
Johannes Berge2ebc742007-07-27 15:43:22 +020074 if (hdrlen >= 16)
Joe Perches0795af52007-10-03 17:59:30 -070075 printk(" A2=%s", print_mac(mac, hdr->addr2));
Johannes Berge2ebc742007-07-27 15:43:22 +020076 if (hdrlen >= 24)
Joe Perches0795af52007-10-03 17:59:30 -070077 printk(" A3=%s", print_mac(mac, hdr->addr3));
Johannes Berge2ebc742007-07-27 15:43:22 +020078 if (hdrlen >= 30)
Joe Perches0795af52007-10-03 17:59:30 -070079 printk(" A4=%s", print_mac(mac, hdr->addr4));
Johannes Berge2ebc742007-07-27 15:43:22 +020080 printk("\n");
81}
82#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83static inline void ieee80211_dump_frame(const char *ifname, const char *title,
84 struct sk_buff *skb)
85{
86}
87#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
88
89static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
90 int next_frag_len)
91{
92 int rate, mrate, erp, dur, i;
93 struct ieee80211_rate *txrate = tx->u.tx.rate;
94 struct ieee80211_local *local = tx->local;
95 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
96
97 erp = txrate->flags & IEEE80211_RATE_ERP;
98
99 /*
100 * data and mgmt (except PS Poll):
101 * - during CFP: 32768
102 * - during contention period:
103 * if addr1 is group address: 0
104 * if more fragments = 0 and addr1 is individual address: time to
105 * transmit one ACK plus SIFS
106 * if more fragments = 1 and addr1 is individual address: time to
107 * transmit next fragment plus 2 x ACK plus 3 x SIFS
108 *
109 * IEEE 802.11, 9.6:
110 * - control response frame (CTS or ACK) shall be transmitted using the
111 * same rate as the immediately previous frame in the frame exchange
112 * sequence, if this rate belongs to the PHY mandatory rates, or else
113 * at the highest possible rate belonging to the PHY rates in the
114 * BSSBasicRateSet
115 */
116
117 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
118 /* TODO: These control frames are not currently sent by
119 * 80211.o, but should they be implemented, this function
120 * needs to be updated to support duration field calculation.
121 *
122 * RTS: time needed to transmit pending data/mgmt frame plus
123 * one CTS frame plus one ACK frame plus 3 x SIFS
124 * CTS: duration of immediately previous RTS minus time
125 * required to transmit CTS and its SIFS
126 * ACK: 0 if immediately previous directed data/mgmt had
127 * more=0, with more=1 duration in ACK frame is duration
128 * from previous frame minus time needed to transmit ACK
129 * and its SIFS
130 * PS Poll: BIT(15) | BIT(14) | aid
131 */
132 return 0;
133 }
134
135 /* data/mgmt */
136 if (0 /* FIX: data/mgmt during CFP */)
137 return 32768;
138
139 if (group_addr) /* Group address as the destination - no ACK */
140 return 0;
141
142 /* Individual destination address:
143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
144 * CTS and ACK frames shall be transmitted using the highest rate in
145 * basic rate set that is less than or equal to the rate of the
146 * immediately previous frame and that is using the same modulation
147 * (CCK or OFDM). If no basic rate set matches with these requirements,
148 * the highest mandatory rate of the PHY that is less than or equal to
149 * the rate of the previous frame is used.
150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
151 */
152 rate = -1;
153 mrate = 10; /* use 1 Mbps if everything fails */
154 for (i = 0; i < mode->num_rates; i++) {
155 struct ieee80211_rate *r = &mode->rates[i];
156 if (r->rate > txrate->rate)
157 break;
158
159 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
160 IEEE80211_RATE_MODULATION(r->flags))
161 continue;
162
163 if (r->flags & IEEE80211_RATE_BASIC)
164 rate = r->rate;
165 else if (r->flags & IEEE80211_RATE_MANDATORY)
166 mrate = r->rate;
167 }
168 if (rate == -1) {
169 /* No matching basic rate found; use highest suitable mandatory
170 * PHY rate */
171 rate = mrate;
172 }
173
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
177
178 dur = ieee80211_frame_duration(local, 10, rate, erp,
Jiri Slaby13262ff2007-08-28 17:01:54 -0400179 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
Johannes Berge2ebc742007-07-27 15:43:22 +0200180
181 if (next_frag_len) {
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
185 /* next fragment */
186 dur += ieee80211_frame_duration(local, next_frag_len,
Jiri Slaby13262ff2007-08-28 17:01:54 -0400187 txrate->rate, erp,
188 tx->sdata->flags &
189 IEEE80211_SDATA_SHORT_PREAMBLE);
Johannes Berge2ebc742007-07-27 15:43:22 +0200190 }
191
192 return dur;
193}
194
195static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
196 int queue)
197{
198 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
199}
200
201static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
202 int queue)
203{
204 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
205}
206
207static int inline is_ieee80211_device(struct net_device *dev,
208 struct net_device *master)
209{
210 return (wdev_priv(dev->ieee80211_ptr) ==
211 wdev_priv(master->ieee80211_ptr));
212}
213
214/* tx handlers */
215
216static ieee80211_txrx_result
217ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
218{
219#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
220 struct sk_buff *skb = tx->skb;
221 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
222#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
223 u32 sta_flags;
224
225 if (unlikely(tx->local->sta_scanning != 0) &&
226 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
227 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
228 return TXRX_DROP;
229
Jiri Slabybadffb72007-08-28 17:01:54 -0400230 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
Johannes Berge2ebc742007-07-27 15:43:22 +0200231 return TXRX_CONTINUE;
232
233 sta_flags = tx->sta ? tx->sta->flags : 0;
234
Jiri Slabybadffb72007-08-28 17:01:54 -0400235 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200236 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
237 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
238 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
239#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700240 DECLARE_MAC_BUF(mac);
Johannes Berge2ebc742007-07-27 15:43:22 +0200241 printk(KERN_DEBUG "%s: dropped data frame to not "
Joe Perches0795af52007-10-03 17:59:30 -0700242 "associated station %s\n",
243 tx->dev->name, print_mac(mac, hdr->addr1));
Johannes Berge2ebc742007-07-27 15:43:22 +0200244#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
245 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
246 return TXRX_DROP;
247 }
248 } else {
249 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
250 tx->local->num_sta == 0 &&
Johannes Berge2ebc742007-07-27 15:43:22 +0200251 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
252 /*
253 * No associated STAs - no need to send multicast
254 * frames.
255 */
256 return TXRX_DROP;
257 }
258 return TXRX_CONTINUE;
259 }
260
261 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
262 !(sta_flags & WLAN_STA_AUTHORIZED))) {
263#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700264 DECLARE_MAC_BUF(mac);
265 printk(KERN_DEBUG "%s: dropped frame to %s"
Johannes Berge2ebc742007-07-27 15:43:22 +0200266 " (unauthorized port)\n", tx->dev->name,
Joe Perches0795af52007-10-03 17:59:30 -0700267 print_mac(mac, hdr->addr1));
Johannes Berge2ebc742007-07-27 15:43:22 +0200268#endif
269 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
270 return TXRX_DROP;
271 }
272
273 return TXRX_CONTINUE;
274}
275
276static ieee80211_txrx_result
277ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
278{
279 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
280
281 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
282 ieee80211_include_sequence(tx->sdata, hdr);
283
284 return TXRX_CONTINUE;
285}
286
287/* This function is called whenever the AP is about to exceed the maximum limit
288 * of buffered frames for power saving STAs. This situation should not really
289 * happen often during normal operation, so dropping the oldest buffered packet
290 * from each queue should be OK to make some room for new frames. */
291static void purge_old_ps_buffers(struct ieee80211_local *local)
292{
293 int total = 0, purged = 0;
294 struct sk_buff *skb;
295 struct ieee80211_sub_if_data *sdata;
296 struct sta_info *sta;
297
298 read_lock(&local->sub_if_lock);
299 list_for_each_entry(sdata, &local->sub_if_list, list) {
300 struct ieee80211_if_ap *ap;
301 if (sdata->dev == local->mdev ||
302 sdata->type != IEEE80211_IF_TYPE_AP)
303 continue;
304 ap = &sdata->u.ap;
305 skb = skb_dequeue(&ap->ps_bc_buf);
306 if (skb) {
307 purged++;
308 dev_kfree_skb(skb);
309 }
310 total += skb_queue_len(&ap->ps_bc_buf);
311 }
312 read_unlock(&local->sub_if_lock);
313
Michael Wube8755e2007-07-27 15:43:23 +0200314 read_lock_bh(&local->sta_lock);
Johannes Berge2ebc742007-07-27 15:43:22 +0200315 list_for_each_entry(sta, &local->sta_list, list) {
316 skb = skb_dequeue(&sta->ps_tx_buf);
317 if (skb) {
318 purged++;
319 dev_kfree_skb(skb);
320 }
321 total += skb_queue_len(&sta->ps_tx_buf);
322 }
Michael Wube8755e2007-07-27 15:43:23 +0200323 read_unlock_bh(&local->sta_lock);
Johannes Berge2ebc742007-07-27 15:43:22 +0200324
325 local->total_ps_buffered = total;
326 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
327 local->mdev->name, purged);
328}
329
330static inline ieee80211_txrx_result
331ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
332{
333 /* broadcast/multicast frame */
334 /* If any of the associated stations is in power save mode,
335 * the frame is buffered to be sent after DTIM beacon frame */
336 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
337 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
338 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
339 !(tx->fc & IEEE80211_FCTL_ORDER)) {
340 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
341 purge_old_ps_buffers(tx->local);
342 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
343 AP_MAX_BC_BUFFER) {
344 if (net_ratelimit()) {
345 printk(KERN_DEBUG "%s: BC TX buffer full - "
346 "dropping the oldest frame\n",
347 tx->dev->name);
348 }
349 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
350 } else
351 tx->local->total_ps_buffered++;
352 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
353 return TXRX_QUEUED;
354 }
355
356 return TXRX_CONTINUE;
357}
358
359static inline ieee80211_txrx_result
360ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
361{
362 struct sta_info *sta = tx->sta;
Joe Perches0795af52007-10-03 17:59:30 -0700363 DECLARE_MAC_BUF(mac);
Johannes Berge2ebc742007-07-27 15:43:22 +0200364
365 if (unlikely(!sta ||
366 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
367 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
368 return TXRX_CONTINUE;
369
370 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
371 struct ieee80211_tx_packet_data *pkt_data;
372#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700373 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
Johannes Berge2ebc742007-07-27 15:43:22 +0200374 "before %d)\n",
Joe Perches0795af52007-10-03 17:59:30 -0700375 print_mac(mac, sta->addr), sta->aid,
Johannes Berge2ebc742007-07-27 15:43:22 +0200376 skb_queue_len(&sta->ps_tx_buf));
377#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
378 sta->flags |= WLAN_STA_TIM;
379 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
380 purge_old_ps_buffers(tx->local);
381 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
382 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
383 if (net_ratelimit()) {
Joe Perches0795af52007-10-03 17:59:30 -0700384 printk(KERN_DEBUG "%s: STA %s TX "
Johannes Berge2ebc742007-07-27 15:43:22 +0200385 "buffer full - dropping oldest frame\n",
Joe Perches0795af52007-10-03 17:59:30 -0700386 tx->dev->name, print_mac(mac, sta->addr));
Johannes Berge2ebc742007-07-27 15:43:22 +0200387 }
388 dev_kfree_skb(old);
389 } else
390 tx->local->total_ps_buffered++;
391 /* Queue frame to be sent after STA sends an PS Poll frame */
392 if (skb_queue_empty(&sta->ps_tx_buf)) {
393 if (tx->local->ops->set_tim)
394 tx->local->ops->set_tim(local_to_hw(tx->local),
395 sta->aid, 1);
396 if (tx->sdata->bss)
397 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
398 }
399 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
400 pkt_data->jiffies = jiffies;
401 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
402 return TXRX_QUEUED;
403 }
404#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
405 else if (unlikely(sta->flags & WLAN_STA_PS)) {
Joe Perches0795af52007-10-03 17:59:30 -0700406 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
Johannes Berge2ebc742007-07-27 15:43:22 +0200407 "set -> send frame\n", tx->dev->name,
Joe Perches0795af52007-10-03 17:59:30 -0700408 print_mac(mac, sta->addr));
Johannes Berge2ebc742007-07-27 15:43:22 +0200409 }
410#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
411 sta->pspoll = 0;
412
413 return TXRX_CONTINUE;
414}
415
416
417static ieee80211_txrx_result
418ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
419{
Jiri Slabybadffb72007-08-28 17:01:54 -0400420 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
Johannes Berge2ebc742007-07-27 15:43:22 +0200421 return TXRX_CONTINUE;
422
Jiri Slabybadffb72007-08-28 17:01:54 -0400423 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
Johannes Berge2ebc742007-07-27 15:43:22 +0200424 return ieee80211_tx_h_unicast_ps_buf(tx);
425 else
426 return ieee80211_tx_h_multicast_ps_buf(tx);
427}
428
429
430
431
432static ieee80211_txrx_result
433ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
434{
Johannes Bergd4e46a32007-09-14 11:10:24 -0400435 struct ieee80211_key *key;
436
Johannes Berge2ebc742007-07-27 15:43:22 +0200437 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
438 tx->key = NULL;
Johannes Bergd4e46a32007-09-14 11:10:24 -0400439 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
440 tx->key = key;
441 else if ((key = rcu_dereference(tx->sdata->default_key)))
442 tx->key = key;
Johannes Berge2ebc742007-07-27 15:43:22 +0200443 else if (tx->sdata->drop_unencrypted &&
444 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
445 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
446 return TXRX_DROP;
Johannes Berg6a7664d2007-09-14 11:10:25 -0400447 } else {
Johannes Berge2ebc742007-07-27 15:43:22 +0200448 tx->key = NULL;
Johannes Berg6a7664d2007-09-14 11:10:25 -0400449 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
450 }
Johannes Berge2ebc742007-07-27 15:43:22 +0200451
452 if (tx->key) {
453 tx->key->tx_rx_count++;
454 if (unlikely(tx->local->key_tx_rx_threshold &&
455 tx->key->tx_rx_count >
456 tx->local->key_tx_rx_threshold)) {
457 ieee80211_key_threshold_notify(tx->dev, tx->key,
458 tx->sta);
459 }
460 }
461
462 return TXRX_CONTINUE;
463}
464
465static ieee80211_txrx_result
466ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
467{
468 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
469 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
470 struct sk_buff **frags, *first, *frag;
471 int i;
472 u16 seq;
473 u8 *pos;
474 int frag_threshold = tx->local->fragmentation_threshold;
475
Jiri Slabybadffb72007-08-28 17:01:54 -0400476 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
Johannes Berge2ebc742007-07-27 15:43:22 +0200477 return TXRX_CONTINUE;
478
479 first = tx->skb;
480
481 hdrlen = ieee80211_get_hdrlen(tx->fc);
482 payload_len = first->len - hdrlen;
483 per_fragm = frag_threshold - hdrlen - FCS_LEN;
Ilpo Järvinen172589c2007-08-28 15:50:33 -0700484 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
Johannes Berge2ebc742007-07-27 15:43:22 +0200485
486 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
487 if (!frags)
488 goto fail;
489
490 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
491 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
492 pos = first->data + hdrlen + per_fragm;
493 left = payload_len - per_fragm;
494 for (i = 0; i < num_fragm - 1; i++) {
495 struct ieee80211_hdr *fhdr;
496 size_t copylen;
497
498 if (left <= 0)
499 goto fail;
500
501 /* reserve enough extra head and tail room for possible
502 * encryption */
503 frag = frags[i] =
504 dev_alloc_skb(tx->local->tx_headroom +
505 frag_threshold +
506 IEEE80211_ENCRYPT_HEADROOM +
507 IEEE80211_ENCRYPT_TAILROOM);
508 if (!frag)
509 goto fail;
510 /* Make sure that all fragments use the same priority so
511 * that they end up using the same TX queue */
512 frag->priority = first->priority;
513 skb_reserve(frag, tx->local->tx_headroom +
514 IEEE80211_ENCRYPT_HEADROOM);
515 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
516 memcpy(fhdr, first->data, hdrlen);
517 if (i == num_fragm - 2)
518 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
519 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
520 copylen = left > per_fragm ? per_fragm : left;
521 memcpy(skb_put(frag, copylen), pos, copylen);
522
523 pos += copylen;
524 left -= copylen;
525 }
526 skb_trim(first, hdrlen + per_fragm);
527
528 tx->u.tx.num_extra_frag = num_fragm - 1;
529 tx->u.tx.extra_frag = frags;
530
531 return TXRX_CONTINUE;
532
533 fail:
534 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
535 if (frags) {
536 for (i = 0; i < num_fragm - 1; i++)
537 if (frags[i])
538 dev_kfree_skb(frags[i]);
539 kfree(frags);
540 }
541 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
542 return TXRX_DROP;
543}
544
545static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
546{
Johannes Berg11a843b2007-08-28 17:01:55 -0400547 if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200548 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
549 return -1;
550 } else {
Johannes Berg8f20fc22007-08-28 17:01:54 -0400551 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
Johannes Berg7848ba72007-09-14 11:10:25 -0400552 if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
553 if (!ieee80211_wep_add_iv(tx->local, skb, tx->key))
Johannes Berge2ebc742007-07-27 15:43:22 +0200554 return -1;
555 }
556 }
557 return 0;
558}
559
560static ieee80211_txrx_result
561ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
562{
563 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
564 u16 fc;
565
566 fc = le16_to_cpu(hdr->frame_control);
567
Johannes Berg8f20fc22007-08-28 17:01:54 -0400568 if (!tx->key || tx->key->conf.alg != ALG_WEP ||
Johannes Berge2ebc742007-07-27 15:43:22 +0200569 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
570 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
571 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
572 return TXRX_CONTINUE;
573
574 tx->u.tx.control->iv_len = WEP_IV_LEN;
575 tx->u.tx.control->icv_len = WEP_ICV_LEN;
576 ieee80211_tx_set_iswep(tx);
577
578 if (wep_encrypt_skb(tx, tx->skb) < 0) {
579 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
580 return TXRX_DROP;
581 }
582
583 if (tx->u.tx.extra_frag) {
584 int i;
585 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
586 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
587 I802_DEBUG_INC(tx->local->
588 tx_handlers_drop_wep);
589 return TXRX_DROP;
590 }
591 }
592 }
593
594 return TXRX_CONTINUE;
595}
596
597static ieee80211_txrx_result
598ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
599{
600 struct rate_control_extra extra;
601
602 memset(&extra, 0, sizeof(extra));
603 extra.mode = tx->u.tx.mode;
604 extra.mgmt_data = tx->sdata &&
605 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
606 extra.ethertype = tx->ethertype;
607
608 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
609 &extra);
610 if (unlikely(extra.probe != NULL)) {
611 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
Jiri Slabybadffb72007-08-28 17:01:54 -0400612 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
Johannes Berge2ebc742007-07-27 15:43:22 +0200613 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
614 tx->u.tx.rate = extra.probe;
615 } else {
616 tx->u.tx.control->alt_retry_rate = -1;
617 }
618 if (!tx->u.tx.rate)
619 return TXRX_DROP;
620 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
Jiri Slaby13262ff2007-08-28 17:01:54 -0400621 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
Jiri Slabybadffb72007-08-28 17:01:54 -0400622 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200623 tx->u.tx.last_frag_rate = tx->u.tx.rate;
Jiri Slabybadffb72007-08-28 17:01:54 -0400624 if (extra.probe)
625 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
626 else
627 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
Johannes Berge2ebc742007-07-27 15:43:22 +0200628 tx->u.tx.rate = extra.nonerp;
629 tx->u.tx.control->rate = extra.nonerp;
630 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
631 } else {
632 tx->u.tx.last_frag_rate = tx->u.tx.rate;
633 tx->u.tx.control->rate = tx->u.tx.rate;
634 }
635 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
Johannes Berge2ebc742007-07-27 15:43:22 +0200636
637 return TXRX_CONTINUE;
638}
639
640static ieee80211_txrx_result
641ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
642{
643 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
Daniel Drake7e9ed182007-07-27 15:43:24 +0200644 u16 fc = le16_to_cpu(hdr->frame_control);
Johannes Berge2ebc742007-07-27 15:43:22 +0200645 u16 dur;
646 struct ieee80211_tx_control *control = tx->u.tx.control;
647 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
648
649 if (!is_multicast_ether_addr(hdr->addr1)) {
650 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
651 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
652 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
Ivo van Doornd5d08de2007-07-27 15:43:23 +0200653 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
Johannes Berge2ebc742007-07-27 15:43:22 +0200654 control->retry_limit =
655 tx->local->long_retry_limit;
656 } else {
657 control->retry_limit =
658 tx->local->short_retry_limit;
659 }
660 } else {
661 control->retry_limit = 1;
662 }
663
Jiri Slabybadffb72007-08-28 17:01:54 -0400664 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
Johannes Berge2ebc742007-07-27 15:43:22 +0200665 /* Do not use multiple retry rates when sending fragmented
666 * frames.
667 * TODO: The last fragment could still use multiple retry
668 * rates. */
669 control->alt_retry_rate = -1;
670 }
671
672 /* Use CTS protection for unicast frames sent using extended rates if
673 * there are associated non-ERP stations and RTS/CTS is not configured
674 * for the frame. */
675 if (mode->mode == MODE_IEEE80211G &&
676 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
Jiri Slabybadffb72007-08-28 17:01:54 -0400677 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
Jiri Slaby13262ff2007-08-28 17:01:54 -0400678 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
Johannes Berge2ebc742007-07-27 15:43:22 +0200679 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
680 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
681
Daniel Drake7e9ed182007-07-27 15:43:24 +0200682 /* Transmit data frames using short preambles if the driver supports
683 * short preambles at the selected rate and short preambles are
684 * available on the network at the current point in time. */
685 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
686 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
Jiri Slaby13262ff2007-08-28 17:01:54 -0400687 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
Daniel Drake7e9ed182007-07-27 15:43:24 +0200688 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
689 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
690 }
691
Johannes Berge2ebc742007-07-27 15:43:22 +0200692 /* Setup duration field for the first fragment of the frame. Duration
693 * for remaining fragments will be updated when they are being sent
694 * to low-level driver in ieee80211_tx(). */
695 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
Jiri Slabybadffb72007-08-28 17:01:54 -0400696 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
697 tx->u.tx.extra_frag[0]->len : 0);
Johannes Berge2ebc742007-07-27 15:43:22 +0200698 hdr->duration_id = cpu_to_le16(dur);
699
700 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
701 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
702 struct ieee80211_rate *rate;
703
704 /* Do not use multiple retry rates when using RTS/CTS */
705 control->alt_retry_rate = -1;
706
707 /* Use min(data rate, max base rate) as CTS/RTS rate */
708 rate = tx->u.tx.rate;
709 while (rate > mode->rates &&
710 !(rate->flags & IEEE80211_RATE_BASIC))
711 rate--;
712
713 control->rts_cts_rate = rate->val;
714 control->rts_rate = rate;
715 }
716
717 if (tx->sta) {
718 tx->sta->tx_packets++;
719 tx->sta->tx_fragments++;
720 tx->sta->tx_bytes += tx->skb->len;
721 if (tx->u.tx.extra_frag) {
722 int i;
723 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
724 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
725 tx->sta->tx_bytes +=
726 tx->u.tx.extra_frag[i]->len;
727 }
728 }
729 }
730
Johannes Berg6a7664d2007-09-14 11:10:25 -0400731 /*
732 * Tell hardware to not encrypt when we had sw crypto.
733 * Because we use the same flag to internally indicate that
734 * no (software) encryption should be done, we have to set it
735 * after all crypto handlers.
736 */
737 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
738 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
739
Johannes Berge2ebc742007-07-27 15:43:22 +0200740 return TXRX_CONTINUE;
741}
742
743static ieee80211_txrx_result
744ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
745{
746 struct ieee80211_local *local = tx->local;
747 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
748 struct sk_buff *skb = tx->skb;
749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
750 u32 load = 0, hdrtime;
751
752 /* TODO: this could be part of tx_status handling, so that the number
753 * of retries would be known; TX rate should in that case be stored
754 * somewhere with the packet */
755
756 /* Estimate total channel use caused by this frame */
757
758 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
759 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
760
761 if (mode->mode == MODE_IEEE80211A ||
Johannes Berge2ebc742007-07-27 15:43:22 +0200762 (mode->mode == MODE_IEEE80211G &&
763 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
764 hdrtime = CHAN_UTIL_HDR_SHORT;
765 else
766 hdrtime = CHAN_UTIL_HDR_LONG;
767
768 load = hdrtime;
769 if (!is_multicast_ether_addr(hdr->addr1))
770 load += hdrtime;
771
772 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
773 load += 2 * hdrtime;
774 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
775 load += hdrtime;
776
777 load += skb->len * tx->u.tx.rate->rate_inv;
778
779 if (tx->u.tx.extra_frag) {
780 int i;
781 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
782 load += 2 * hdrtime;
783 load += tx->u.tx.extra_frag[i]->len *
784 tx->u.tx.rate->rate;
785 }
786 }
787
788 /* Divide channel_use by 8 to avoid wrapping around the counter */
789 load >>= CHAN_UTIL_SHIFT;
790 local->channel_use_raw += load;
791 if (tx->sta)
792 tx->sta->channel_use_raw += load;
793 tx->sdata->channel_use_raw += load;
794
795 return TXRX_CONTINUE;
796}
797
798/* TODO: implement register/unregister functions for adding TX/RX handlers
799 * into ordered list */
800
801ieee80211_tx_handler ieee80211_tx_handlers[] =
802{
803 ieee80211_tx_h_check_assoc,
804 ieee80211_tx_h_sequence,
805 ieee80211_tx_h_ps_buf,
806 ieee80211_tx_h_select_key,
807 ieee80211_tx_h_michael_mic_add,
808 ieee80211_tx_h_fragment,
809 ieee80211_tx_h_tkip_encrypt,
810 ieee80211_tx_h_ccmp_encrypt,
811 ieee80211_tx_h_wep_encrypt,
812 ieee80211_tx_h_rate_ctrl,
813 ieee80211_tx_h_misc,
814 ieee80211_tx_h_load_stats,
815 NULL
816};
817
818/* actual transmit path */
819
820/*
821 * deal with packet injection down monitor interface
822 * with Radiotap Header -- only called for monitor mode interface
823 */
824static ieee80211_txrx_result
825__ieee80211_parse_tx_radiotap(
826 struct ieee80211_txrx_data *tx,
827 struct sk_buff *skb, struct ieee80211_tx_control *control)
828{
829 /*
830 * this is the moment to interpret and discard the radiotap header that
831 * must be at the start of the packet injected in Monitor mode
832 *
833 * Need to take some care with endian-ness since radiotap
834 * args are little-endian
835 */
836
837 struct ieee80211_radiotap_iterator iterator;
838 struct ieee80211_radiotap_header *rthdr =
839 (struct ieee80211_radiotap_header *) skb->data;
840 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
841 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
842
843 /*
844 * default control situation for all injected packets
845 * FIXME: this does not suit all usage cases, expand to allow control
846 */
847
848 control->retry_limit = 1; /* no retry */
Johannes Berge2ebc742007-07-27 15:43:22 +0200849 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
850 IEEE80211_TXCTL_USE_CTS_PROTECT);
851 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
852 IEEE80211_TXCTL_NO_ACK;
853 control->antenna_sel_tx = 0; /* default to default antenna */
854
855 /*
856 * for every radiotap entry that is present
857 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
858 * entries present, or -EINVAL on error)
859 */
860
861 while (!ret) {
862 int i, target_rate;
863
864 ret = ieee80211_radiotap_iterator_next(&iterator);
865
866 if (ret)
867 continue;
868
869 /* see if this argument is something we can use */
870 switch (iterator.this_arg_index) {
871 /*
872 * You must take care when dereferencing iterator.this_arg
873 * for multibyte types... the pointer is not aligned. Use
874 * get_unaligned((type *)iterator.this_arg) to dereference
875 * iterator.this_arg for type "type" safely on all arches.
876 */
877 case IEEE80211_RADIOTAP_RATE:
878 /*
879 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
880 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
881 */
882 target_rate = (*iterator.this_arg) * 5;
883 for (i = 0; i < mode->num_rates; i++) {
884 struct ieee80211_rate *r = &mode->rates[i];
885
886 if (r->rate > target_rate)
887 continue;
888
889 control->rate = r;
890
891 if (r->flags & IEEE80211_RATE_PREAMBLE2)
892 control->tx_rate = r->val2;
893 else
894 control->tx_rate = r->val;
895
896 /* end on exact match */
897 if (r->rate == target_rate)
898 i = mode->num_rates;
899 }
900 break;
901
902 case IEEE80211_RADIOTAP_ANTENNA:
903 /*
904 * radiotap uses 0 for 1st ant, mac80211 is 1 for
905 * 1st ant
906 */
907 control->antenna_sel_tx = (*iterator.this_arg) + 1;
908 break;
909
910 case IEEE80211_RADIOTAP_DBM_TX_POWER:
911 control->power_level = *iterator.this_arg;
912 break;
913
914 case IEEE80211_RADIOTAP_FLAGS:
915 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
916 /*
917 * this indicates that the skb we have been
918 * handed has the 32-bit FCS CRC at the end...
919 * we should react to that by snipping it off
920 * because it will be recomputed and added
921 * on transmission
922 */
923 if (skb->len < (iterator.max_length + FCS_LEN))
924 return TXRX_DROP;
925
926 skb_trim(skb, skb->len - FCS_LEN);
927 }
928 break;
929
930 default:
931 break;
932 }
933 }
934
935 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
936 return TXRX_DROP;
937
938 /*
939 * remove the radiotap header
940 * iterator->max_length was sanity-checked against
941 * skb->len by iterator init
942 */
943 skb_pull(skb, iterator.max_length);
944
945 return TXRX_CONTINUE;
946}
947
948static ieee80211_txrx_result inline
949__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
950 struct sk_buff *skb,
951 struct net_device *dev,
952 struct ieee80211_tx_control *control)
953{
954 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
955 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
956 struct ieee80211_sub_if_data *sdata;
957 ieee80211_txrx_result res = TXRX_CONTINUE;
958
959 int hdrlen;
960
961 memset(tx, 0, sizeof(*tx));
962 tx->skb = skb;
963 tx->dev = dev; /* use original interface */
964 tx->local = local;
965 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
Johannes Berge2ebc742007-07-27 15:43:22 +0200966
967 /*
968 * set defaults for things that can be set by
969 * injected radiotap headers
970 */
971 control->power_level = local->hw.conf.power_level;
972 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
Johannes Berge2ebc742007-07-27 15:43:22 +0200973
974 /* process and remove the injection radiotap header */
975 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
976 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
977 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
978 TXRX_DROP) {
979 return TXRX_DROP;
980 }
981 /*
982 * we removed the radiotap header after this point,
983 * we filled control with what we could use
984 * set to the actual ieee header now
985 */
986 hdr = (struct ieee80211_hdr *) skb->data;
987 res = TXRX_QUEUED; /* indication it was monitor packet */
988 }
989
warmcat24338792007-09-14 11:10:25 -0400990 tx->sta = sta_info_get(local, hdr->addr1);
991 tx->fc = le16_to_cpu(hdr->frame_control);
Johannes Berge2ebc742007-07-27 15:43:22 +0200992 tx->u.tx.control = control;
Jiri Slabybadffb72007-08-28 17:01:54 -0400993 if (is_multicast_ether_addr(hdr->addr1)) {
994 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
Johannes Berge2ebc742007-07-27 15:43:22 +0200995 control->flags |= IEEE80211_TXCTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -0400996 } else {
997 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
Johannes Berge2ebc742007-07-27 15:43:22 +0200998 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
Jiri Slabybadffb72007-08-28 17:01:54 -0400999 }
1000 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
1001 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
1002 skb->len + FCS_LEN > local->fragmentation_threshold &&
1003 !local->ops->set_frag_threshold)
1004 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
1005 else
1006 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
Johannes Berge2ebc742007-07-27 15:43:22 +02001007 if (!tx->sta)
1008 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1009 else if (tx->sta->clear_dst_mask) {
1010 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1011 tx->sta->clear_dst_mask = 0;
1012 }
1013 hdrlen = ieee80211_get_hdrlen(tx->fc);
1014 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1015 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1016 tx->ethertype = (pos[0] << 8) | pos[1];
1017 }
1018 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1019
1020 return res;
1021}
1022
1023/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1024 * finished with it. */
1025static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1026 struct sk_buff *skb,
1027 struct net_device *mdev,
1028 struct ieee80211_tx_control *control)
1029{
1030 struct ieee80211_tx_packet_data *pkt_data;
1031 struct net_device *dev;
1032
1033 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001034 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
Johannes Berge2ebc742007-07-27 15:43:22 +02001035 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1036 dev_put(dev);
1037 dev = NULL;
1038 }
1039 if (unlikely(!dev))
1040 return -ENODEV;
1041 __ieee80211_tx_prepare(tx, skb, dev, control);
1042 return 0;
1043}
1044
1045static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1046 struct ieee80211_txrx_data *tx)
1047{
1048 struct ieee80211_tx_control *control = tx->u.tx.control;
1049 int ret, i;
1050
1051 if (!ieee80211_qdisc_installed(local->mdev) &&
1052 __ieee80211_queue_stopped(local, 0)) {
1053 netif_stop_queue(local->mdev);
1054 return IEEE80211_TX_AGAIN;
1055 }
1056 if (skb) {
1057 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1058 ret = local->ops->tx(local_to_hw(local), skb, control);
1059 if (ret)
1060 return IEEE80211_TX_AGAIN;
1061 local->mdev->trans_start = jiffies;
1062 ieee80211_led_tx(local, 1);
1063 }
1064 if (tx->u.tx.extra_frag) {
1065 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1066 IEEE80211_TXCTL_USE_CTS_PROTECT |
1067 IEEE80211_TXCTL_CLEAR_DST_MASK |
1068 IEEE80211_TXCTL_FIRST_FRAGMENT);
1069 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1070 if (!tx->u.tx.extra_frag[i])
1071 continue;
1072 if (__ieee80211_queue_stopped(local, control->queue))
1073 return IEEE80211_TX_FRAG_AGAIN;
1074 if (i == tx->u.tx.num_extra_frag) {
1075 control->tx_rate = tx->u.tx.last_frag_hwrate;
1076 control->rate = tx->u.tx.last_frag_rate;
Jiri Slabybadffb72007-08-28 17:01:54 -04001077 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
Johannes Berge2ebc742007-07-27 15:43:22 +02001078 control->flags |=
1079 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1080 else
1081 control->flags &=
1082 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1083 }
1084
1085 ieee80211_dump_frame(local->mdev->name,
1086 "TX to low-level driver",
1087 tx->u.tx.extra_frag[i]);
1088 ret = local->ops->tx(local_to_hw(local),
1089 tx->u.tx.extra_frag[i],
1090 control);
1091 if (ret)
1092 return IEEE80211_TX_FRAG_AGAIN;
1093 local->mdev->trans_start = jiffies;
1094 ieee80211_led_tx(local, 1);
1095 tx->u.tx.extra_frag[i] = NULL;
1096 }
1097 kfree(tx->u.tx.extra_frag);
1098 tx->u.tx.extra_frag = NULL;
1099 }
1100 return IEEE80211_TX_OK;
1101}
1102
1103static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1104 struct ieee80211_tx_control *control, int mgmt)
1105{
1106 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1107 struct sta_info *sta;
1108 ieee80211_tx_handler *handler;
1109 struct ieee80211_txrx_data tx;
1110 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1111 int ret, i;
1112
1113 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1114
1115 if (unlikely(skb->len < 10)) {
1116 dev_kfree_skb(skb);
1117 return 0;
1118 }
1119
1120 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1121
1122 if (res_prepare == TXRX_DROP) {
1123 dev_kfree_skb(skb);
1124 return 0;
1125 }
1126
Johannes Bergd4e46a32007-09-14 11:10:24 -04001127 /*
1128 * key references are protected using RCU and this requires that
1129 * we are in a read-site RCU section during receive processing
1130 */
1131 rcu_read_lock();
1132
Johannes Berge2ebc742007-07-27 15:43:22 +02001133 sta = tx.sta;
1134 tx.u.tx.mgmt_interface = mgmt;
1135 tx.u.tx.mode = local->hw.conf.mode;
1136
1137 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1138 res = TXRX_CONTINUE;
1139 } else {
1140 for (handler = local->tx_handlers; *handler != NULL;
1141 handler++) {
1142 res = (*handler)(&tx);
1143 if (res != TXRX_CONTINUE)
1144 break;
1145 }
1146 }
1147
1148 skb = tx.skb; /* handlers are allowed to change skb */
1149
1150 if (sta)
1151 sta_info_put(sta);
1152
1153 if (unlikely(res == TXRX_DROP)) {
1154 I802_DEBUG_INC(local->tx_handlers_drop);
1155 goto drop;
1156 }
1157
1158 if (unlikely(res == TXRX_QUEUED)) {
1159 I802_DEBUG_INC(local->tx_handlers_queued);
Johannes Bergd4e46a32007-09-14 11:10:24 -04001160 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001161 return 0;
1162 }
1163
1164 if (tx.u.tx.extra_frag) {
1165 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1166 int next_len, dur;
1167 struct ieee80211_hdr *hdr =
1168 (struct ieee80211_hdr *)
1169 tx.u.tx.extra_frag[i]->data;
1170
1171 if (i + 1 < tx.u.tx.num_extra_frag) {
1172 next_len = tx.u.tx.extra_frag[i + 1]->len;
1173 } else {
1174 next_len = 0;
1175 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1176 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1177 }
1178 dur = ieee80211_duration(&tx, 0, next_len);
1179 hdr->duration_id = cpu_to_le16(dur);
1180 }
1181 }
1182
1183retry:
1184 ret = __ieee80211_tx(local, skb, &tx);
1185 if (ret) {
1186 struct ieee80211_tx_stored_packet *store =
1187 &local->pending_packet[control->queue];
1188
1189 if (ret == IEEE80211_TX_FRAG_AGAIN)
1190 skb = NULL;
1191 set_bit(IEEE80211_LINK_STATE_PENDING,
1192 &local->state[control->queue]);
1193 smp_mb();
1194 /* When the driver gets out of buffers during sending of
1195 * fragments and calls ieee80211_stop_queue, there is
1196 * a small window between IEEE80211_LINK_STATE_XOFF and
1197 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1198 * gets available in that window (i.e. driver calls
1199 * ieee80211_wake_queue), we would end up with ieee80211_tx
1200 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1201 * continuing transmitting here when that situation is
1202 * possible to have happened. */
1203 if (!__ieee80211_queue_stopped(local, control->queue)) {
1204 clear_bit(IEEE80211_LINK_STATE_PENDING,
1205 &local->state[control->queue]);
1206 goto retry;
1207 }
1208 memcpy(&store->control, control,
1209 sizeof(struct ieee80211_tx_control));
1210 store->skb = skb;
1211 store->extra_frag = tx.u.tx.extra_frag;
1212 store->num_extra_frag = tx.u.tx.num_extra_frag;
1213 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1214 store->last_frag_rate = tx.u.tx.last_frag_rate;
Jiri Slabybadffb72007-08-28 17:01:54 -04001215 store->last_frag_rate_ctrl_probe =
1216 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
Johannes Berge2ebc742007-07-27 15:43:22 +02001217 }
Johannes Bergd4e46a32007-09-14 11:10:24 -04001218 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001219 return 0;
1220
1221 drop:
1222 if (skb)
1223 dev_kfree_skb(skb);
1224 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1225 if (tx.u.tx.extra_frag[i])
1226 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1227 kfree(tx.u.tx.extra_frag);
Johannes Bergd4e46a32007-09-14 11:10:24 -04001228 rcu_read_unlock();
Johannes Berge2ebc742007-07-27 15:43:22 +02001229 return 0;
1230}
1231
1232/* device xmit handlers */
1233
1234int ieee80211_master_start_xmit(struct sk_buff *skb,
1235 struct net_device *dev)
1236{
1237 struct ieee80211_tx_control control;
1238 struct ieee80211_tx_packet_data *pkt_data;
1239 struct net_device *odev = NULL;
1240 struct ieee80211_sub_if_data *osdata;
1241 int headroom;
1242 int ret;
1243
1244 /*
1245 * copy control out of the skb so other people can use skb->cb
1246 */
1247 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1248 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1249
1250 if (pkt_data->ifindex)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001251 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
Johannes Berge2ebc742007-07-27 15:43:22 +02001252 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1253 dev_put(odev);
1254 odev = NULL;
1255 }
1256 if (unlikely(!odev)) {
1257#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1258 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1259 "originating device\n", dev->name);
1260#endif
1261 dev_kfree_skb(skb);
1262 return 0;
1263 }
1264 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1265
1266 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1267 if (skb_headroom(skb) < headroom) {
1268 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1269 dev_kfree_skb(skb);
1270 dev_put(odev);
1271 return 0;
1272 }
1273 }
1274
1275 control.ifindex = odev->ifindex;
1276 control.type = osdata->type;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001277 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
Johannes Berge2ebc742007-07-27 15:43:22 +02001278 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001279 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
Johannes Berge2ebc742007-07-27 15:43:22 +02001280 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001281 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
Johannes Berge2ebc742007-07-27 15:43:22 +02001282 control.flags |= IEEE80211_TXCTL_REQUEUE;
1283 control.queue = pkt_data->queue;
1284
1285 ret = ieee80211_tx(odev, skb, &control,
1286 control.type == IEEE80211_IF_TYPE_MGMT);
1287 dev_put(odev);
1288
1289 return ret;
1290}
1291
1292int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1293 struct net_device *dev)
1294{
1295 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1296 struct ieee80211_tx_packet_data *pkt_data;
1297 struct ieee80211_radiotap_header *prthdr =
1298 (struct ieee80211_radiotap_header *)skb->data;
Andy Green9b8a74e2007-07-27 15:43:24 +02001299 u16 len_rthdr;
Johannes Berge2ebc742007-07-27 15:43:22 +02001300
Andy Green9b8a74e2007-07-27 15:43:24 +02001301 /* check for not even having the fixed radiotap header part */
1302 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1303 goto fail; /* too short to be possibly valid */
1304
1305 /* is it a header version we can trust to find length from? */
1306 if (unlikely(prthdr->it_version))
1307 goto fail; /* only version 0 is supported */
1308
1309 /* then there must be a radiotap header with a length we can use */
1310 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1311
1312 /* does the skb contain enough to deliver on the alleged length? */
1313 if (unlikely(skb->len < len_rthdr))
1314 goto fail; /* skb too short for claimed rt header extent */
Johannes Berge2ebc742007-07-27 15:43:22 +02001315
1316 skb->dev = local->mdev;
1317
1318 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1319 memset(pkt_data, 0, sizeof(*pkt_data));
Andy Green9b8a74e2007-07-27 15:43:24 +02001320 /* needed because we set skb device to master */
Johannes Berge2ebc742007-07-27 15:43:22 +02001321 pkt_data->ifindex = dev->ifindex;
Andy Green9b8a74e2007-07-27 15:43:24 +02001322
Jiri Slabye8bf9642007-08-28 17:01:54 -04001323 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
Johannes Berge2ebc742007-07-27 15:43:22 +02001324
Johannes Berge2ebc742007-07-27 15:43:22 +02001325 /*
1326 * fix up the pointers accounting for the radiotap
1327 * header still being in there. We are being given
1328 * a precooked IEEE80211 header so no need for
1329 * normal processing
1330 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001331 skb_set_mac_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001332 /*
Andy Green9b8a74e2007-07-27 15:43:24 +02001333 * these are just fixed to the end of the rt area since we
1334 * don't have any better information and at this point, nobody cares
Johannes Berge2ebc742007-07-27 15:43:22 +02001335 */
Andy Green9b8a74e2007-07-27 15:43:24 +02001336 skb_set_network_header(skb, len_rthdr);
1337 skb_set_transport_header(skb, len_rthdr);
Johannes Berge2ebc742007-07-27 15:43:22 +02001338
Andy Green9b8a74e2007-07-27 15:43:24 +02001339 /* pass the radiotap header up to the next stage intact */
1340 dev_queue_xmit(skb);
Johannes Berge2ebc742007-07-27 15:43:22 +02001341 return NETDEV_TX_OK;
Andy Green9b8a74e2007-07-27 15:43:24 +02001342
1343fail:
1344 dev_kfree_skb(skb);
1345 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
Johannes Berge2ebc742007-07-27 15:43:22 +02001346}
1347
1348/**
1349 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1350 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1351 * @skb: packet to be sent
1352 * @dev: incoming interface
1353 *
1354 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1355 * not be freed, and caller is responsible for either retrying later or freeing
1356 * skb).
1357 *
1358 * This function takes in an Ethernet header and encapsulates it with suitable
1359 * IEEE 802.11 header based on which interface the packet is coming in. The
1360 * encapsulated packet will then be passed to master interface, wlan#.11, for
1361 * transmission (through low-level driver).
1362 */
1363int ieee80211_subif_start_xmit(struct sk_buff *skb,
1364 struct net_device *dev)
1365{
1366 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1367 struct ieee80211_tx_packet_data *pkt_data;
1368 struct ieee80211_sub_if_data *sdata;
1369 int ret = 1, head_need;
1370 u16 ethertype, hdrlen, fc;
1371 struct ieee80211_hdr hdr;
1372 const u8 *encaps_data;
1373 int encaps_len, skip_header_bytes;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001374 int nh_pos, h_pos;
Johannes Berge2ebc742007-07-27 15:43:22 +02001375 struct sta_info *sta;
1376
1377 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1378 if (unlikely(skb->len < ETH_HLEN)) {
1379 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1380 dev->name, skb->len);
1381 ret = 0;
1382 goto fail;
1383 }
1384
1385 nh_pos = skb_network_header(skb) - skb->data;
1386 h_pos = skb_transport_header(skb) - skb->data;
1387
1388 /* convert Ethernet header to proper 802.11 header (based on
1389 * operation mode) */
1390 ethertype = (skb->data[12] << 8) | skb->data[13];
1391 /* TODO: handling for 802.1x authorized/unauthorized port */
1392 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1393
Johannes Bergcf966832007-08-28 17:01:54 -04001394 switch (sdata->type) {
1395 case IEEE80211_IF_TYPE_AP:
1396 case IEEE80211_IF_TYPE_VLAN:
Johannes Berge2ebc742007-07-27 15:43:22 +02001397 fc |= IEEE80211_FCTL_FROMDS;
1398 /* DA BSSID SA */
1399 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1400 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1401 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1402 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001403 break;
1404 case IEEE80211_IF_TYPE_WDS:
Johannes Berge2ebc742007-07-27 15:43:22 +02001405 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1406 /* RA TA DA SA */
1407 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1408 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1409 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1410 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1411 hdrlen = 30;
Johannes Bergcf966832007-08-28 17:01:54 -04001412 break;
1413 case IEEE80211_IF_TYPE_STA:
Johannes Berge2ebc742007-07-27 15:43:22 +02001414 fc |= IEEE80211_FCTL_TODS;
1415 /* BSSID SA DA */
1416 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1417 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1418 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1419 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001420 break;
1421 case IEEE80211_IF_TYPE_IBSS:
Johannes Berge2ebc742007-07-27 15:43:22 +02001422 /* DA SA BSSID */
1423 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1424 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1425 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1426 hdrlen = 24;
Johannes Bergcf966832007-08-28 17:01:54 -04001427 break;
1428 default:
Johannes Berge2ebc742007-07-27 15:43:22 +02001429 ret = 0;
1430 goto fail;
1431 }
1432
1433 /* receiver is QoS enabled, use a QoS type frame */
1434 sta = sta_info_get(local, hdr.addr1);
1435 if (sta) {
1436 if (sta->flags & WLAN_STA_WME) {
1437 fc |= IEEE80211_STYPE_QOS_DATA;
1438 hdrlen += 2;
1439 }
1440 sta_info_put(sta);
1441 }
1442
1443 hdr.frame_control = cpu_to_le16(fc);
1444 hdr.duration_id = 0;
1445 hdr.seq_ctrl = 0;
1446
1447 skip_header_bytes = ETH_HLEN;
1448 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1449 encaps_data = bridge_tunnel_header;
1450 encaps_len = sizeof(bridge_tunnel_header);
1451 skip_header_bytes -= 2;
1452 } else if (ethertype >= 0x600) {
1453 encaps_data = rfc1042_header;
1454 encaps_len = sizeof(rfc1042_header);
1455 skip_header_bytes -= 2;
1456 } else {
1457 encaps_data = NULL;
1458 encaps_len = 0;
1459 }
1460
1461 skb_pull(skb, skip_header_bytes);
1462 nh_pos -= skip_header_bytes;
1463 h_pos -= skip_header_bytes;
1464
1465 /* TODO: implement support for fragments so that there is no need to
1466 * reallocate and copy payload; it might be enough to support one
1467 * extra fragment that would be copied in the beginning of the frame
1468 * data.. anyway, it would be nice to include this into skb structure
1469 * somehow
1470 *
1471 * There are few options for this:
1472 * use skb->cb as an extra space for 802.11 header
1473 * allocate new buffer if not enough headroom
1474 * make sure that there is enough headroom in every skb by increasing
1475 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1476 * alloc_skb() (net/core/skbuff.c)
1477 */
1478 head_need = hdrlen + encaps_len + local->tx_headroom;
1479 head_need -= skb_headroom(skb);
1480
1481 /* We are going to modify skb data, so make a copy of it if happens to
1482 * be cloned. This could happen, e.g., with Linux bridge code passing
1483 * us broadcast frames. */
1484
1485 if (head_need > 0 || skb_cloned(skb)) {
1486#if 0
1487 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1488 "of headroom\n", dev->name, head_need);
1489#endif
1490
1491 if (skb_cloned(skb))
1492 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1493 else
1494 I802_DEBUG_INC(local->tx_expand_skb_head);
1495 /* Since we have to reallocate the buffer, make sure that there
1496 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1497 * before payload and 12 after). */
1498 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1499 12, GFP_ATOMIC)) {
1500 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1501 "\n", dev->name);
1502 goto fail;
1503 }
1504 }
1505
1506 if (encaps_data) {
1507 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1508 nh_pos += encaps_len;
1509 h_pos += encaps_len;
1510 }
Johannes Bergc29b9b92007-09-14 11:10:24 -04001511
1512 if (fc & IEEE80211_STYPE_QOS_DATA) {
1513 __le16 *qos_control;
1514
1515 qos_control = (__le16*) skb_push(skb, 2);
1516 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1517 /*
1518 * Maybe we could actually set some fields here, for now just
1519 * initialise to zero to indicate no special operation.
1520 */
1521 *qos_control = 0;
1522 } else
1523 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1524
Johannes Berge2ebc742007-07-27 15:43:22 +02001525 nh_pos += hdrlen;
1526 h_pos += hdrlen;
1527
1528 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1529 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1530 pkt_data->ifindex = dev->ifindex;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001531 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1532 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
Johannes Berge2ebc742007-07-27 15:43:22 +02001533
1534 skb->dev = local->mdev;
Stephen Hemminger68aae112007-08-24 11:29:34 -07001535 dev->stats.tx_packets++;
1536 dev->stats.tx_bytes += skb->len;
Johannes Berge2ebc742007-07-27 15:43:22 +02001537
1538 /* Update skb pointers to various headers since this modified frame
1539 * is going to go through Linux networking code that may potentially
1540 * need things like pointer to IP header. */
1541 skb_set_mac_header(skb, 0);
1542 skb_set_network_header(skb, nh_pos);
1543 skb_set_transport_header(skb, h_pos);
1544
1545 dev->trans_start = jiffies;
1546 dev_queue_xmit(skb);
1547
1548 return 0;
1549
1550 fail:
1551 if (!ret)
1552 dev_kfree_skb(skb);
1553
1554 return ret;
1555}
1556
1557/*
1558 * This is the transmit routine for the 802.11 type interfaces
1559 * called by upper layers of the linux networking
1560 * stack when it has a frame to transmit
1561 */
1562int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1563{
1564 struct ieee80211_sub_if_data *sdata;
1565 struct ieee80211_tx_packet_data *pkt_data;
1566 struct ieee80211_hdr *hdr;
1567 u16 fc;
1568
1569 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1570
1571 if (skb->len < 10) {
1572 dev_kfree_skb(skb);
1573 return 0;
1574 }
1575
1576 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1577 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1578 0, GFP_ATOMIC)) {
1579 dev_kfree_skb(skb);
1580 return 0;
1581 }
1582 }
1583
1584 hdr = (struct ieee80211_hdr *) skb->data;
1585 fc = le16_to_cpu(hdr->frame_control);
1586
1587 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1588 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1589 pkt_data->ifindex = sdata->dev->ifindex;
Jiri Slabye8bf9642007-08-28 17:01:54 -04001590 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1591 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
Johannes Berge2ebc742007-07-27 15:43:22 +02001592
1593 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1594 skb->dev = sdata->local->mdev;
1595
1596 /*
1597 * We're using the protocol field of the the frame control header
1598 * to request TX callback for hostapd. BIT(1) is checked.
1599 */
1600 if ((fc & BIT(1)) == BIT(1)) {
Jiri Slabye8bf9642007-08-28 17:01:54 -04001601 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
Johannes Berge2ebc742007-07-27 15:43:22 +02001602 fc &= ~BIT(1);
1603 hdr->frame_control = cpu_to_le16(fc);
1604 }
1605
Jiri Slabye8bf9642007-08-28 17:01:54 -04001606 if (!(fc & IEEE80211_FCTL_PROTECTED))
1607 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
Johannes Berge2ebc742007-07-27 15:43:22 +02001608
Stephen Hemminger68aae112007-08-24 11:29:34 -07001609 dev->stats.tx_packets++;
1610 dev->stats.tx_bytes += skb->len;
Johannes Berge2ebc742007-07-27 15:43:22 +02001611
1612 dev_queue_xmit(skb);
1613
1614 return 0;
1615}
1616
1617/* helper functions for pending packets for when queues are stopped */
1618
1619void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1620{
1621 int i, j;
1622 struct ieee80211_tx_stored_packet *store;
1623
1624 for (i = 0; i < local->hw.queues; i++) {
1625 if (!__ieee80211_queue_pending(local, i))
1626 continue;
1627 store = &local->pending_packet[i];
1628 kfree_skb(store->skb);
1629 for (j = 0; j < store->num_extra_frag; j++)
1630 kfree_skb(store->extra_frag[j]);
1631 kfree(store->extra_frag);
1632 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1633 }
1634}
1635
1636void ieee80211_tx_pending(unsigned long data)
1637{
1638 struct ieee80211_local *local = (struct ieee80211_local *)data;
1639 struct net_device *dev = local->mdev;
1640 struct ieee80211_tx_stored_packet *store;
1641 struct ieee80211_txrx_data tx;
1642 int i, ret, reschedule = 0;
1643
1644 netif_tx_lock_bh(dev);
1645 for (i = 0; i < local->hw.queues; i++) {
1646 if (__ieee80211_queue_stopped(local, i))
1647 continue;
1648 if (!__ieee80211_queue_pending(local, i)) {
1649 reschedule = 1;
1650 continue;
1651 }
1652 store = &local->pending_packet[i];
1653 tx.u.tx.control = &store->control;
1654 tx.u.tx.extra_frag = store->extra_frag;
1655 tx.u.tx.num_extra_frag = store->num_extra_frag;
1656 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1657 tx.u.tx.last_frag_rate = store->last_frag_rate;
Jiri Slabybadffb72007-08-28 17:01:54 -04001658 tx.flags = 0;
1659 if (store->last_frag_rate_ctrl_probe)
1660 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
Johannes Berge2ebc742007-07-27 15:43:22 +02001661 ret = __ieee80211_tx(local, store->skb, &tx);
1662 if (ret) {
1663 if (ret == IEEE80211_TX_FRAG_AGAIN)
1664 store->skb = NULL;
1665 } else {
1666 clear_bit(IEEE80211_LINK_STATE_PENDING,
1667 &local->state[i]);
1668 reschedule = 1;
1669 }
1670 }
1671 netif_tx_unlock_bh(dev);
1672 if (reschedule) {
1673 if (!ieee80211_qdisc_installed(dev)) {
1674 if (!__ieee80211_queue_stopped(local, 0))
1675 netif_wake_queue(dev);
1676 } else
1677 netif_schedule(dev);
1678 }
1679}
1680
1681/* functions for drivers to get certain frames */
1682
1683static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1684 struct ieee80211_if_ap *bss,
1685 struct sk_buff *skb)
1686{
1687 u8 *pos, *tim;
1688 int aid0 = 0;
1689 int i, have_bits = 0, n1, n2;
1690
1691 /* Generate bitmap for TIM only if there are any STAs in power save
1692 * mode. */
Michael Wube8755e2007-07-27 15:43:23 +02001693 read_lock_bh(&local->sta_lock);
Johannes Berge2ebc742007-07-27 15:43:22 +02001694 if (atomic_read(&bss->num_sta_ps) > 0)
1695 /* in the hope that this is faster than
1696 * checking byte-for-byte */
1697 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1698 IEEE80211_MAX_AID+1);
1699
1700 if (bss->dtim_count == 0)
1701 bss->dtim_count = bss->dtim_period - 1;
1702 else
1703 bss->dtim_count--;
1704
1705 tim = pos = (u8 *) skb_put(skb, 6);
1706 *pos++ = WLAN_EID_TIM;
1707 *pos++ = 4;
1708 *pos++ = bss->dtim_count;
1709 *pos++ = bss->dtim_period;
1710
1711 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1712 aid0 = 1;
1713
1714 if (have_bits) {
1715 /* Find largest even number N1 so that bits numbered 1 through
1716 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1717 * (N2 + 1) x 8 through 2007 are 0. */
1718 n1 = 0;
1719 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1720 if (bss->tim[i]) {
1721 n1 = i & 0xfe;
1722 break;
1723 }
1724 }
1725 n2 = n1;
1726 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1727 if (bss->tim[i]) {
1728 n2 = i;
1729 break;
1730 }
1731 }
1732
1733 /* Bitmap control */
1734 *pos++ = n1 | aid0;
1735 /* Part Virt Bitmap */
1736 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1737
1738 tim[1] = n2 - n1 + 4;
1739 skb_put(skb, n2 - n1);
1740 } else {
1741 *pos++ = aid0; /* Bitmap control */
1742 *pos++ = 0; /* Part Virt Bitmap */
1743 }
Michael Wube8755e2007-07-27 15:43:23 +02001744 read_unlock_bh(&local->sta_lock);
Johannes Berge2ebc742007-07-27 15:43:22 +02001745}
1746
1747struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1748 struct ieee80211_tx_control *control)
1749{
1750 struct ieee80211_local *local = hw_to_local(hw);
1751 struct sk_buff *skb;
1752 struct net_device *bdev;
1753 struct ieee80211_sub_if_data *sdata = NULL;
1754 struct ieee80211_if_ap *ap = NULL;
1755 struct ieee80211_rate *rate;
1756 struct rate_control_extra extra;
1757 u8 *b_head, *b_tail;
1758 int bh_len, bt_len;
1759
Eric W. Biederman881d9662007-09-17 11:56:21 -07001760 bdev = dev_get_by_index(&init_net, if_id);
Johannes Berge2ebc742007-07-27 15:43:22 +02001761 if (bdev) {
1762 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1763 ap = &sdata->u.ap;
1764 dev_put(bdev);
1765 }
1766
1767 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1768 !ap->beacon_head) {
1769#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1770 if (net_ratelimit())
1771 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1772 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1773#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1774 return NULL;
1775 }
1776
1777 /* Assume we are generating the normal beacon locally */
1778 b_head = ap->beacon_head;
1779 b_tail = ap->beacon_tail;
1780 bh_len = ap->beacon_head_len;
1781 bt_len = ap->beacon_tail_len;
1782
1783 skb = dev_alloc_skb(local->tx_headroom +
1784 bh_len + bt_len + 256 /* maximum TIM len */);
1785 if (!skb)
1786 return NULL;
1787
1788 skb_reserve(skb, local->tx_headroom);
1789 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1790
1791 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1792
1793 ieee80211_beacon_add_tim(local, ap, skb);
1794
1795 if (b_tail) {
1796 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1797 }
1798
1799 if (control) {
1800 memset(&extra, 0, sizeof(extra));
1801 extra.mode = local->oper_hw_mode;
1802
1803 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1804 if (!rate) {
1805 if (net_ratelimit()) {
1806 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1807 "found\n", local->mdev->name);
1808 }
1809 dev_kfree_skb(skb);
1810 return NULL;
1811 }
1812
Jiri Slaby13262ff2007-08-28 17:01:54 -04001813 control->tx_rate =
1814 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1815 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
Johannes Berge2ebc742007-07-27 15:43:22 +02001816 rate->val2 : rate->val;
1817 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1818 control->power_level = local->hw.conf.power_level;
1819 control->flags |= IEEE80211_TXCTL_NO_ACK;
1820 control->retry_limit = 1;
1821 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1822 }
1823
1824 ap->num_beacons++;
1825 return skb;
1826}
1827EXPORT_SYMBOL(ieee80211_beacon_get);
1828
Daniel Drake7e9ed182007-07-27 15:43:24 +02001829void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
Johannes Berge2ebc742007-07-27 15:43:22 +02001830 const void *frame, size_t frame_len,
1831 const struct ieee80211_tx_control *frame_txctl,
1832 struct ieee80211_rts *rts)
1833{
1834 const struct ieee80211_hdr *hdr = frame;
1835 u16 fctl;
1836
1837 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1838 rts->frame_control = cpu_to_le16(fctl);
Daniel Drake7e9ed182007-07-27 15:43:24 +02001839 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02001840 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1841 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1842}
1843EXPORT_SYMBOL(ieee80211_rts_get);
1844
Daniel Drake7e9ed182007-07-27 15:43:24 +02001845void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
Johannes Berge2ebc742007-07-27 15:43:22 +02001846 const void *frame, size_t frame_len,
1847 const struct ieee80211_tx_control *frame_txctl,
1848 struct ieee80211_cts *cts)
1849{
1850 const struct ieee80211_hdr *hdr = frame;
1851 u16 fctl;
1852
1853 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1854 cts->frame_control = cpu_to_le16(fctl);
Daniel Drake7e9ed182007-07-27 15:43:24 +02001855 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
Johannes Berge2ebc742007-07-27 15:43:22 +02001856 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1857}
1858EXPORT_SYMBOL(ieee80211_ctstoself_get);
1859
1860struct sk_buff *
1861ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1862 struct ieee80211_tx_control *control)
1863{
1864 struct ieee80211_local *local = hw_to_local(hw);
1865 struct sk_buff *skb;
1866 struct sta_info *sta;
1867 ieee80211_tx_handler *handler;
1868 struct ieee80211_txrx_data tx;
1869 ieee80211_txrx_result res = TXRX_DROP;
1870 struct net_device *bdev;
1871 struct ieee80211_sub_if_data *sdata;
1872 struct ieee80211_if_ap *bss = NULL;
1873
Eric W. Biederman881d9662007-09-17 11:56:21 -07001874 bdev = dev_get_by_index(&init_net, if_id);
Johannes Berge2ebc742007-07-27 15:43:22 +02001875 if (bdev) {
1876 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1877 bss = &sdata->u.ap;
1878 dev_put(bdev);
1879 }
1880 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1881 return NULL;
1882
1883 if (bss->dtim_count != 0)
1884 return NULL; /* send buffered bc/mc only after DTIM beacon */
1885 memset(control, 0, sizeof(*control));
1886 while (1) {
1887 skb = skb_dequeue(&bss->ps_bc_buf);
1888 if (!skb)
1889 return NULL;
1890 local->total_ps_buffered--;
1891
1892 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1893 struct ieee80211_hdr *hdr =
1894 (struct ieee80211_hdr *) skb->data;
1895 /* more buffered multicast/broadcast frames ==> set
1896 * MoreData flag in IEEE 802.11 header to inform PS
1897 * STAs */
1898 hdr->frame_control |=
1899 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1900 }
1901
1902 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1903 break;
1904 dev_kfree_skb_any(skb);
1905 }
1906 sta = tx.sta;
Jiri Slabybadffb72007-08-28 17:01:54 -04001907 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
Tomas Winkler475fa492007-09-02 22:58:21 +03001908 tx.u.tx.mode = local->hw.conf.mode;
Johannes Berge2ebc742007-07-27 15:43:22 +02001909
1910 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1911 res = (*handler)(&tx);
1912 if (res == TXRX_DROP || res == TXRX_QUEUED)
1913 break;
1914 }
1915 dev_put(tx.dev);
1916 skb = tx.skb; /* handlers are allowed to change skb */
1917
1918 if (res == TXRX_DROP) {
1919 I802_DEBUG_INC(local->tx_handlers_drop);
1920 dev_kfree_skb(skb);
1921 skb = NULL;
1922 } else if (res == TXRX_QUEUED) {
1923 I802_DEBUG_INC(local->tx_handlers_queued);
1924 skb = NULL;
1925 }
1926
1927 if (sta)
1928 sta_info_put(sta);
1929
1930 return skb;
1931}
1932EXPORT_SYMBOL(ieee80211_get_buffered_bc);