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rc80211-pid: export tuning parameters through debugfs
[linux-2.6-block.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 1/*
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>
d4e46a3d 20#include <linux/rcupdate.h>
881d966b 21#include <net/net_namespace.h>
e2ebc74d
JB		 22#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;
0795af57 57 DECLARE_MAC_BUF(mac);
e2ebc74d
JB		 58
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)
0795af57 73 printk(" A1=%s", print_mac(mac, hdr->addr1));
e2ebc74d 74 if (hdrlen >= 16)
0795af57 75 printk(" A2=%s", print_mac(mac, hdr->addr2));
e2ebc74d 76 if (hdrlen >= 24)
0795af57 77 printk(" A3=%s", print_mac(mac, hdr->addr3));
e2ebc74d 78 if (hdrlen >= 30)
0795af57 79 printk(" A4=%s", print_mac(mac, hdr->addr4));
e2ebc74d
JB		 80 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,
13262ffd 179 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 180
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,
13262ffd
JS		 187 txrate->rate, erp,
188 tx->sdata->flags &
189 IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 190 }
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
58d4185e
JB		 225 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
226 return TXRX_CONTINUE;
227
ece8eddd 228 if (unlikely(tx->local->sta_sw_scanning) &&
e2ebc74d
JB		 229 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
230 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
231 return TXRX_DROP;
232
badffb72 233 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
e2ebc74d
JB		 234 return TXRX_CONTINUE;
235
236 sta_flags = tx->sta ? tx->sta->flags : 0;
237
badffb72 238 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
e2ebc74d
JB		 239 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
240 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
241 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
242#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0795af57 243 DECLARE_MAC_BUF(mac);
e2ebc74d 244 printk(KERN_DEBUG "%s: dropped data frame to not "
0795af57
JP		 245 "associated station %s\n",
246 tx->dev->name, print_mac(mac, hdr->addr1));
e2ebc74d
JB		 247#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
248 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
249 return TXRX_DROP;
250 }
251 } else {
252 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
253 tx->local->num_sta == 0 &&
e2ebc74d
JB		 254 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
255 /*
256 * No associated STAs - no need to send multicast
257 * frames.
258 */
259 return TXRX_DROP;
260 }
261 return TXRX_CONTINUE;
262 }
263
f9d540ee 264 if (unlikely(/* !injected && */ tx->sdata->ieee802_1x &&
e2ebc74d
JB		 265 !(sta_flags & WLAN_STA_AUTHORIZED))) {
266#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0795af57
JP		 267 DECLARE_MAC_BUF(mac);
268 printk(KERN_DEBUG "%s: dropped frame to %s"
e2ebc74d 269 " (unauthorized port)\n", tx->dev->name,
0795af57 270 print_mac(mac, hdr->addr1));
e2ebc74d
JB		 271#endif
272 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
273 return TXRX_DROP;
274 }
275
276 return TXRX_CONTINUE;
277}
278
279static ieee80211_txrx_result
280ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
281{
282 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
283
284 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
285 ieee80211_include_sequence(tx->sdata, hdr);
286
287 return TXRX_CONTINUE;
288}
289
290/* This function is called whenever the AP is about to exceed the maximum limit
291 * of buffered frames for power saving STAs. This situation should not really
292 * happen often during normal operation, so dropping the oldest buffered packet
293 * from each queue should be OK to make some room for new frames. */
294static void purge_old_ps_buffers(struct ieee80211_local *local)
295{
296 int total = 0, purged = 0;
297 struct sk_buff *skb;
298 struct ieee80211_sub_if_data *sdata;
299 struct sta_info *sta;
300
79010420
JB		 301 /*
302 * virtual interfaces are protected by RCU
303 */
304 rcu_read_lock();
305
306 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
e2ebc74d
JB		 307 struct ieee80211_if_ap *ap;
308 if (sdata->dev == local->mdev ||
309 sdata->type != IEEE80211_IF_TYPE_AP)
310 continue;
311 ap = &sdata->u.ap;
312 skb = skb_dequeue(&ap->ps_bc_buf);
313 if (skb) {
314 purged++;
315 dev_kfree_skb(skb);
316 }
317 total += skb_queue_len(&ap->ps_bc_buf);
318 }
79010420 319 rcu_read_unlock();
e2ebc74d 320
be8755e1 321 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 322 list_for_each_entry(sta, &local->sta_list, list) {
323 skb = skb_dequeue(&sta->ps_tx_buf);
324 if (skb) {
325 purged++;
326 dev_kfree_skb(skb);
327 }
328 total += skb_queue_len(&sta->ps_tx_buf);
329 }
be8755e1 330 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 331
332 local->total_ps_buffered = total;
333 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
dd1cd4c6 334 wiphy_name(local->hw.wiphy), purged);
e2ebc74d
JB		 335}
336
337static inline ieee80211_txrx_result
338ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
339{
340 /* broadcast/multicast frame */
341 /* If any of the associated stations is in power save mode,
342 * the frame is buffered to be sent after DTIM beacon frame */
343 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
344 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
345 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
346 !(tx->fc & IEEE80211_FCTL_ORDER)) {
347 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
348 purge_old_ps_buffers(tx->local);
349 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
350 AP_MAX_BC_BUFFER) {
351 if (net_ratelimit()) {
352 printk(KERN_DEBUG "%s: BC TX buffer full - "
353 "dropping the oldest frame\n",
354 tx->dev->name);
355 }
356 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
357 } else
358 tx->local->total_ps_buffered++;
359 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
360 return TXRX_QUEUED;
361 }
362
363 return TXRX_CONTINUE;
364}
365
366static inline ieee80211_txrx_result
367ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
368{
369 struct sta_info *sta = tx->sta;
0795af57 370 DECLARE_MAC_BUF(mac);
e2ebc74d
JB		 371
372 if (unlikely(!sta ||
373 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
374 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
375 return TXRX_CONTINUE;
376
377 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
378 struct ieee80211_tx_packet_data *pkt_data;
379#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 380 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
e2ebc74d 381 "before %d)\n",
0795af57 382 print_mac(mac, sta->addr), sta->aid,
e2ebc74d
JB		 383 skb_queue_len(&sta->ps_tx_buf));
384#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
385 sta->flags |= WLAN_STA_TIM;
386 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
387 purge_old_ps_buffers(tx->local);
388 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
389 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
390 if (net_ratelimit()) {
0795af57 391 printk(KERN_DEBUG "%s: STA %s TX "
e2ebc74d 392 "buffer full - dropping oldest frame\n",
0795af57 393 tx->dev->name, print_mac(mac, sta->addr));
e2ebc74d
JB		 394 }
395 dev_kfree_skb(old);
396 } else
397 tx->local->total_ps_buffered++;
398 /* Queue frame to be sent after STA sends an PS Poll frame */
399 if (skb_queue_empty(&sta->ps_tx_buf)) {
400 if (tx->local->ops->set_tim)
401 tx->local->ops->set_tim(local_to_hw(tx->local),
402 sta->aid, 1);
403 if (tx->sdata->bss)
404 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
405 }
406 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
407 pkt_data->jiffies = jiffies;
408 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
409 return TXRX_QUEUED;
410 }
411#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
412 else if (unlikely(sta->flags & WLAN_STA_PS)) {
0795af57 413 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
e2ebc74d 414 "set -> send frame\n", tx->dev->name,
0795af57 415 print_mac(mac, sta->addr));
e2ebc74d
JB		 416 }
417#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
418 sta->pspoll = 0;
419
420 return TXRX_CONTINUE;
421}
422
e2ebc74d
JB		 423static ieee80211_txrx_result
424ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
425{
badffb72 426 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
e2ebc74d
JB		 427 return TXRX_CONTINUE;
428
badffb72 429 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
e2ebc74d
JB		 430 return ieee80211_tx_h_unicast_ps_buf(tx);
431 else
432 return ieee80211_tx_h_multicast_ps_buf(tx);
433}
434
e2ebc74d
JB		 435static ieee80211_txrx_result
436ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
437{
d4e46a3d 438 struct ieee80211_key *key;
76ee65bf
RR		 439 const struct ieee80211_hdr *hdr;
440 u16 fc;
441
442 hdr = (const struct ieee80211_hdr *) tx->skb->data;
443 fc = le16_to_cpu(hdr->frame_control);
d4e46a3d 444
e2ebc74d
JB		 445 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
446 tx->key = NULL;
d4e46a3d
JB		 447 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
448 tx->key = key;
449 else if ((key = rcu_dereference(tx->sdata->default_key)))
450 tx->key = key;
e2ebc74d 451 else if (tx->sdata->drop_unencrypted &&
76ee65bf
RR		 452 !(tx->sdata->eapol &&
453 ieee80211_is_eapol(tx->skb, ieee80211_get_hdrlen(fc)))) {
e2ebc74d
JB		 454 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
455 return TXRX_DROP;
6a7664d4 456 } else {
e2ebc74d 457 tx->key = NULL;
6a7664d4
JB		 458 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
459 }
e2ebc74d
JB		 460
461 if (tx->key) {
462 tx->key->tx_rx_count++;
011bfcc4 463 /* TODO: add threshold stuff again */
e2ebc74d
JB		 464 }
465
466 return TXRX_CONTINUE;
467}
468
469static ieee80211_txrx_result
470ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
471{
472 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
473 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
474 struct sk_buff **frags, *first, *frag;
475 int i;
476 u16 seq;
477 u8 *pos;
478 int frag_threshold = tx->local->fragmentation_threshold;
479
badffb72 480 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
e2ebc74d
JB		 481 return TXRX_CONTINUE;
482
483 first = tx->skb;
484
485 hdrlen = ieee80211_get_hdrlen(tx->fc);
486 payload_len = first->len - hdrlen;
487 per_fragm = frag_threshold - hdrlen - FCS_LEN;
172589cc 488 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
e2ebc74d
JB		 489
490 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
491 if (!frags)
492 goto fail;
493
494 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
495 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
496 pos = first->data + hdrlen + per_fragm;
497 left = payload_len - per_fragm;
498 for (i = 0; i < num_fragm - 1; i++) {
499 struct ieee80211_hdr *fhdr;
500 size_t copylen;
501
502 if (left <= 0)
503 goto fail;
504
505 /* reserve enough extra head and tail room for possible
506 * encryption */
507 frag = frags[i] =
508 dev_alloc_skb(tx->local->tx_headroom +
509 frag_threshold +
510 IEEE80211_ENCRYPT_HEADROOM +
511 IEEE80211_ENCRYPT_TAILROOM);
512 if (!frag)
513 goto fail;
514 /* Make sure that all fragments use the same priority so
515 * that they end up using the same TX queue */
516 frag->priority = first->priority;
517 skb_reserve(frag, tx->local->tx_headroom +
518 IEEE80211_ENCRYPT_HEADROOM);
519 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
520 memcpy(fhdr, first->data, hdrlen);
521 if (i == num_fragm - 2)
522 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
523 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
524 copylen = left > per_fragm ? per_fragm : left;
525 memcpy(skb_put(frag, copylen), pos, copylen);
526
527 pos += copylen;
528 left -= copylen;
529 }
530 skb_trim(first, hdrlen + per_fragm);
531
532 tx->u.tx.num_extra_frag = num_fragm - 1;
533 tx->u.tx.extra_frag = frags;
534
535 return TXRX_CONTINUE;
536
537 fail:
538 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
539 if (frags) {
540 for (i = 0; i < num_fragm - 1; i++)
541 if (frags[i])
542 dev_kfree_skb(frags[i]);
543 kfree(frags);
544 }
545 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
546 return TXRX_DROP;
547}
548
e2ebc74d 549static ieee80211_txrx_result
6a22a59d 550ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
e2ebc74d 551{
6a22a59d 552 if (!tx->key)
e2ebc74d
JB		 553 return TXRX_CONTINUE;
554
6a22a59d
JB		 555 switch (tx->key->conf.alg) {
556 case ALG_WEP:
557 return ieee80211_crypto_wep_encrypt(tx);
558 case ALG_TKIP:
559 return ieee80211_crypto_tkip_encrypt(tx);
560 case ALG_CCMP:
561 return ieee80211_crypto_ccmp_encrypt(tx);
e2ebc74d
JB		 562 }
563
6a22a59d
JB		 564 /* not reached */
565 WARN_ON(1);
566 return TXRX_DROP;
e2ebc74d
JB		 567}
568
569static ieee80211_txrx_result
570ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
571{
1abbe498 572 struct rate_selection rsel;
e2ebc74d 573
58d4185e 574 if (likely(!tx->u.tx.rate)) {
1abbe498
MN		 575 rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel);
576 tx->u.tx.rate = rsel.rate;
577 if (unlikely(rsel.probe != NULL)) {
58d4185e
JB		 578 tx->u.tx.control->flags |=
579 IEEE80211_TXCTL_RATE_CTRL_PROBE;
580 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
581 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
1abbe498 582 tx->u.tx.rate = rsel.probe;
58d4185e
JB		 583 } else
584 tx->u.tx.control->alt_retry_rate = -1;
585
586 if (!tx->u.tx.rate)
587 return TXRX_DROP;
588 } else
e2ebc74d 589 tx->u.tx.control->alt_retry_rate = -1;
58d4185e 590
e2ebc74d 591 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
13262ffd 592 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
1abbe498 593 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
e2ebc74d 594 tx->u.tx.last_frag_rate = tx->u.tx.rate;
1abbe498 595 if (rsel.probe)
badffb72
JS		 596 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
597 else
598 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1abbe498
MN		 599 tx->u.tx.rate = rsel.nonerp;
600 tx->u.tx.control->rate = rsel.nonerp;
e2ebc74d
JB		 601 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
602 } else {
603 tx->u.tx.last_frag_rate = tx->u.tx.rate;
604 tx->u.tx.control->rate = tx->u.tx.rate;
605 }
606 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
e2ebc74d
JB		 607
608 return TXRX_CONTINUE;
609}
610
611static ieee80211_txrx_result
612ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
613{
614 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
7e9ed188 615 u16 fc = le16_to_cpu(hdr->frame_control);
e2ebc74d
JB		 616 u16 dur;
617 struct ieee80211_tx_control *control = tx->u.tx.control;
618 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
619
58d4185e
JB		 620 if (!control->retry_limit) {
621 if (!is_multicast_ether_addr(hdr->addr1)) {
622 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
623 && tx->local->rts_threshold <
624 IEEE80211_MAX_RTS_THRESHOLD) {
625 control->flags |=
626 IEEE80211_TXCTL_USE_RTS_CTS;
627 control->flags |=
628 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
629 control->retry_limit =
630 tx->local->long_retry_limit;
631 } else {
632 control->retry_limit =
633 tx->local->short_retry_limit;
634 }
e2ebc74d 635 } else {
58d4185e 636 control->retry_limit = 1;
e2ebc74d 637 }
e2ebc74d
JB		 638 }
639
badffb72 640 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
e2ebc74d
JB		 641 /* Do not use multiple retry rates when sending fragmented
642 * frames.
643 * TODO: The last fragment could still use multiple retry
644 * rates. */
645 control->alt_retry_rate = -1;
646 }
647
648 /* Use CTS protection for unicast frames sent using extended rates if
649 * there are associated non-ERP stations and RTS/CTS is not configured
650 * for the frame. */
651 if (mode->mode == MODE_IEEE80211G &&
652 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
badffb72 653 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
13262ffd 654 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
e2ebc74d
JB		 655 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
656 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
657
7e9ed188
DD		 658 /* Transmit data frames using short preambles if the driver supports
659 * short preambles at the selected rate and short preambles are
660 * available on the network at the current point in time. */
661 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
662 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
13262ffd 663 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
7e9ed188
DD		 664 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
665 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
666 }
667
e2ebc74d
JB		 668 /* Setup duration field for the first fragment of the frame. Duration
669 * for remaining fragments will be updated when they are being sent
670 * to low-level driver in ieee80211_tx(). */
671 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
badffb72
JS		 672 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
673 tx->u.tx.extra_frag[0]->len : 0);
e2ebc74d
JB		 674 hdr->duration_id = cpu_to_le16(dur);
675
676 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
677 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
678 struct ieee80211_rate *rate;
679
680 /* Do not use multiple retry rates when using RTS/CTS */
681 control->alt_retry_rate = -1;
682
683 /* Use min(data rate, max base rate) as CTS/RTS rate */
684 rate = tx->u.tx.rate;
685 while (rate > mode->rates &&
686 !(rate->flags & IEEE80211_RATE_BASIC))
687 rate--;
688
689 control->rts_cts_rate = rate->val;
690 control->rts_rate = rate;
691 }
692
693 if (tx->sta) {
694 tx->sta->tx_packets++;
695 tx->sta->tx_fragments++;
696 tx->sta->tx_bytes += tx->skb->len;
697 if (tx->u.tx.extra_frag) {
698 int i;
699 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
700 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
701 tx->sta->tx_bytes +=
702 tx->u.tx.extra_frag[i]->len;
703 }
704 }
705 }
706
6a7664d4
JB		 707 /*
708 * Tell hardware to not encrypt when we had sw crypto.
709 * Because we use the same flag to internally indicate that
710 * no (software) encryption should be done, we have to set it
711 * after all crypto handlers.
712 */
713 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
714 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
715
e2ebc74d
JB		 716 return TXRX_CONTINUE;
717}
718
719static ieee80211_txrx_result
720ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
721{
722 struct ieee80211_local *local = tx->local;
723 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
724 struct sk_buff *skb = tx->skb;
725 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
726 u32 load = 0, hdrtime;
727
728 /* TODO: this could be part of tx_status handling, so that the number
729 * of retries would be known; TX rate should in that case be stored
730 * somewhere with the packet */
731
732 /* Estimate total channel use caused by this frame */
733
734 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
735 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
736
737 if (mode->mode == MODE_IEEE80211A ||
e2ebc74d
JB		 738 (mode->mode == MODE_IEEE80211G &&
739 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
740 hdrtime = CHAN_UTIL_HDR_SHORT;
741 else
742 hdrtime = CHAN_UTIL_HDR_LONG;
743
744 load = hdrtime;
745 if (!is_multicast_ether_addr(hdr->addr1))
746 load += hdrtime;
747
748 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
749 load += 2 * hdrtime;
750 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
751 load += hdrtime;
752
753 load += skb->len * tx->u.tx.rate->rate_inv;
754
755 if (tx->u.tx.extra_frag) {
756 int i;
757 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
758 load += 2 * hdrtime;
759 load += tx->u.tx.extra_frag[i]->len *
760 tx->u.tx.rate->rate;
761 }
762 }
763
764 /* Divide channel_use by 8 to avoid wrapping around the counter */
765 load >>= CHAN_UTIL_SHIFT;
766 local->channel_use_raw += load;
767 if (tx->sta)
768 tx->sta->channel_use_raw += load;
769 tx->sdata->channel_use_raw += load;
770
771 return TXRX_CONTINUE;
772}
773
774/* TODO: implement register/unregister functions for adding TX/RX handlers
775 * into ordered list */
776
777ieee80211_tx_handler ieee80211_tx_handlers[] =
778{
779 ieee80211_tx_h_check_assoc,
780 ieee80211_tx_h_sequence,
781 ieee80211_tx_h_ps_buf,
782 ieee80211_tx_h_select_key,
783 ieee80211_tx_h_michael_mic_add,
784 ieee80211_tx_h_fragment,
6a22a59d 785 ieee80211_tx_h_encrypt,
e2ebc74d
JB		 786 ieee80211_tx_h_rate_ctrl,
787 ieee80211_tx_h_misc,
788 ieee80211_tx_h_load_stats,
789 NULL
790};
791
792/* actual transmit path */
793
794/*
795 * deal with packet injection down monitor interface
796 * with Radiotap Header -- only called for monitor mode interface
797 */
798static ieee80211_txrx_result
58d4185e
JB		 799__ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
800 struct sk_buff *skb)
e2ebc74d
JB		 801{
802 /*
803 * this is the moment to interpret and discard the radiotap header that
804 * must be at the start of the packet injected in Monitor mode
805 *
806 * Need to take some care with endian-ness since radiotap
807 * args are little-endian
808 */
809
810 struct ieee80211_radiotap_iterator iterator;
811 struct ieee80211_radiotap_header *rthdr =
812 (struct ieee80211_radiotap_header *) skb->data;
813 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
814 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
58d4185e 815 struct ieee80211_tx_control *control = tx->u.tx.control;
e2ebc74d 816
58d4185e
JB		 817 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
818 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
819 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 820
821 /*
822 * for every radiotap entry that is present
823 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
824 * entries present, or -EINVAL on error)
825 */
826
827 while (!ret) {
828 int i, target_rate;
829
830 ret = ieee80211_radiotap_iterator_next(&iterator);
831
832 if (ret)
833 continue;
834
835 /* see if this argument is something we can use */
836 switch (iterator.this_arg_index) {
837 /*
838 * You must take care when dereferencing iterator.this_arg
839 * for multibyte types... the pointer is not aligned. Use
840 * get_unaligned((type *)iterator.this_arg) to dereference
841 * iterator.this_arg for type "type" safely on all arches.
842 */
843 case IEEE80211_RADIOTAP_RATE:
844 /*
845 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
846 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
847 */
848 target_rate = (*iterator.this_arg) * 5;
849 for (i = 0; i < mode->num_rates; i++) {
850 struct ieee80211_rate *r = &mode->rates[i];
851
58d4185e
JB		 852 if (r->rate == target_rate) {
853 tx->u.tx.rate = r;
854 break;
855 }
e2ebc74d
JB		 856 }
857 break;
858
859 case IEEE80211_RADIOTAP_ANTENNA:
860 /*
861 * radiotap uses 0 for 1st ant, mac80211 is 1 for
862 * 1st ant
863 */
864 control->antenna_sel_tx = (*iterator.this_arg) + 1;
865 break;
866
867 case IEEE80211_RADIOTAP_DBM_TX_POWER:
868 control->power_level = *iterator.this_arg;
869 break;
870
871 case IEEE80211_RADIOTAP_FLAGS:
872 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
873 /*
874 * this indicates that the skb we have been
875 * handed has the 32-bit FCS CRC at the end...
876 * we should react to that by snipping it off
877 * because it will be recomputed and added
878 * on transmission
879 */
880 if (skb->len < (iterator.max_length + FCS_LEN))
881 return TXRX_DROP;
882
883 skb_trim(skb, skb->len - FCS_LEN);
884 }
58d4185e
JB		 885 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
886 control->flags &=
887 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
888 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
889 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 890 break;
891
58d4185e
JB		 892 /*
893 * Please update the file
894 * Documentation/networking/mac80211-injection.txt
895 * when parsing new fields here.
896 */
897
e2ebc74d
JB		 898 default:
899 break;
900 }
901 }
902
903 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
904 return TXRX_DROP;
905
906 /*
907 * remove the radiotap header
908 * iterator->max_length was sanity-checked against
909 * skb->len by iterator init
910 */
911 skb_pull(skb, iterator.max_length);
912
913 return TXRX_CONTINUE;
914}
915
58d4185e
JB		 916/*
917 * initialises @tx
918 */
919static ieee80211_txrx_result
e2ebc74d
JB		 920__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
921 struct sk_buff *skb,
922 struct net_device *dev,
923 struct ieee80211_tx_control *control)
924{
925 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
58d4185e 926 struct ieee80211_hdr *hdr;
e2ebc74d
JB		 927 struct ieee80211_sub_if_data *sdata;
928 ieee80211_txrx_result res = TXRX_CONTINUE;
929
930 int hdrlen;
931
932 memset(tx, 0, sizeof(*tx));
933 tx->skb = skb;
934 tx->dev = dev; /* use original interface */
935 tx->local = local;
936 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
58d4185e 937 tx->u.tx.control = control;
e2ebc74d 938 /*
58d4185e
JB		 939 * Set this flag (used below to indicate "automatic fragmentation"),
940 * it will be cleared/left by radiotap as desired.
e2ebc74d 941 */
58d4185e 942 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 943
944 /* process and remove the injection radiotap header */
945 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
946 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
58d4185e 947 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
e2ebc74d 948 return TXRX_DROP;
58d4185e 949
e2ebc74d 950 /*
58d4185e
JB		 951 * __ieee80211_parse_tx_radiotap has now removed
952 * the radiotap header that was present and pre-filled
953 * 'tx' with tx control information.
e2ebc74d 954 */
e2ebc74d
JB		 955 }
956
58d4185e
JB		 957 hdr = (struct ieee80211_hdr *) skb->data;
958
24338793 959 tx->sta = sta_info_get(local, hdr->addr1);
960 tx->fc = le16_to_cpu(hdr->frame_control);
58d4185e 961
badffb72
JS		 962 if (is_multicast_ether_addr(hdr->addr1)) {
963 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 964 control->flags |= IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 965 } else {
966 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 967 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
badffb72 968 }
58d4185e
JB		 969
970 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
971 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
972 skb->len + FCS_LEN > local->fragmentation_threshold &&
973 !local->ops->set_frag_threshold)
974 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
975 else
976 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
977 }
978
e2ebc74d
JB		 979 if (!tx->sta)
980 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
981 else if (tx->sta->clear_dst_mask) {
982 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
983 tx->sta->clear_dst_mask = 0;
984 }
58d4185e 985
e2ebc74d
JB		 986 hdrlen = ieee80211_get_hdrlen(tx->fc);
987 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
988 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
989 tx->ethertype = (pos[0] << 8) | pos[1];
990 }
991 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
992
993 return res;
994}
995
996/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
58d4185e
JB		 997 * finished with it.
998 *
999 * NB: @tx is uninitialised when passed in here
1000 */
1001static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1002 struct sk_buff *skb,
1003 struct net_device *mdev,
1004 struct ieee80211_tx_control *control)
e2ebc74d
JB		 1005{
1006 struct ieee80211_tx_packet_data *pkt_data;
1007 struct net_device *dev;
1008
1009 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
881d966b 1010 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 1011 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1012 dev_put(dev);
1013 dev = NULL;
1014 }
1015 if (unlikely(!dev))
1016 return -ENODEV;
58d4185e 1017 /* initialises tx with control */
e2ebc74d
JB		 1018 __ieee80211_tx_prepare(tx, skb, dev, control);
1019 return 0;
1020}
1021
1022static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1023 struct ieee80211_txrx_data *tx)
1024{
1025 struct ieee80211_tx_control *control = tx->u.tx.control;
1026 int ret, i;
1027
1028 if (!ieee80211_qdisc_installed(local->mdev) &&
1029 __ieee80211_queue_stopped(local, 0)) {
1030 netif_stop_queue(local->mdev);
1031 return IEEE80211_TX_AGAIN;
1032 }
1033 if (skb) {
dd1cd4c6
JB		 1034 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1035 "TX to low-level driver", skb);
e2ebc74d
JB		 1036 ret = local->ops->tx(local_to_hw(local), skb, control);
1037 if (ret)
1038 return IEEE80211_TX_AGAIN;
1039 local->mdev->trans_start = jiffies;
1040 ieee80211_led_tx(local, 1);
1041 }
1042 if (tx->u.tx.extra_frag) {
1043 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1044 IEEE80211_TXCTL_USE_CTS_PROTECT |
1045 IEEE80211_TXCTL_CLEAR_DST_MASK |
1046 IEEE80211_TXCTL_FIRST_FRAGMENT);
1047 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1048 if (!tx->u.tx.extra_frag[i])
1049 continue;
1050 if (__ieee80211_queue_stopped(local, control->queue))
1051 return IEEE80211_TX_FRAG_AGAIN;
1052 if (i == tx->u.tx.num_extra_frag) {
1053 control->tx_rate = tx->u.tx.last_frag_hwrate;
1054 control->rate = tx->u.tx.last_frag_rate;
badffb72 1055 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
e2ebc74d
JB		 1056 control->flags |=
1057 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1058 else
1059 control->flags &=
1060 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1061 }
1062
dd1cd4c6 1063 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
e2ebc74d
JB		 1064 "TX to low-level driver",
1065 tx->u.tx.extra_frag[i]);
1066 ret = local->ops->tx(local_to_hw(local),
1067 tx->u.tx.extra_frag[i],
1068 control);
1069 if (ret)
1070 return IEEE80211_TX_FRAG_AGAIN;
1071 local->mdev->trans_start = jiffies;
1072 ieee80211_led_tx(local, 1);
1073 tx->u.tx.extra_frag[i] = NULL;
1074 }
1075 kfree(tx->u.tx.extra_frag);
1076 tx->u.tx.extra_frag = NULL;
1077 }
1078 return IEEE80211_TX_OK;
1079}
1080
1081static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
f9d540ee 1082 struct ieee80211_tx_control *control)
e2ebc74d
JB		 1083{
1084 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1085 struct sta_info *sta;
1086 ieee80211_tx_handler *handler;
1087 struct ieee80211_txrx_data tx;
1088 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1089 int ret, i;
1090
1091 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1092
1093 if (unlikely(skb->len < 10)) {
1094 dev_kfree_skb(skb);
1095 return 0;
1096 }
1097
58d4185e 1098 /* initialises tx */
e2ebc74d
JB		 1099 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1100
1101 if (res_prepare == TXRX_DROP) {
1102 dev_kfree_skb(skb);
1103 return 0;
1104 }
1105
d4e46a3d
JB		 1106 /*
1107 * key references are protected using RCU and this requires that
1108 * we are in a read-site RCU section during receive processing
1109 */
1110 rcu_read_lock();
1111
e2ebc74d 1112 sta = tx.sta;
e2ebc74d
JB		 1113 tx.u.tx.mode = local->hw.conf.mode;
1114
58d4185e
JB		 1115 for (handler = local->tx_handlers; *handler != NULL;
1116 handler++) {
1117 res = (*handler)(&tx);
1118 if (res != TXRX_CONTINUE)
1119 break;
e2ebc74d
JB		 1120 }
1121
1122 skb = tx.skb; /* handlers are allowed to change skb */
1123
1124 if (sta)
1125 sta_info_put(sta);
1126
1127 if (unlikely(res == TXRX_DROP)) {
1128 I802_DEBUG_INC(local->tx_handlers_drop);
1129 goto drop;
1130 }
1131
1132 if (unlikely(res == TXRX_QUEUED)) {
1133 I802_DEBUG_INC(local->tx_handlers_queued);
d4e46a3d 1134 rcu_read_unlock();
e2ebc74d
JB		 1135 return 0;
1136 }
1137
1138 if (tx.u.tx.extra_frag) {
1139 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1140 int next_len, dur;
1141 struct ieee80211_hdr *hdr =
1142 (struct ieee80211_hdr *)
1143 tx.u.tx.extra_frag[i]->data;
1144
1145 if (i + 1 < tx.u.tx.num_extra_frag) {
1146 next_len = tx.u.tx.extra_frag[i + 1]->len;
1147 } else {
1148 next_len = 0;
1149 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1150 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1151 }
1152 dur = ieee80211_duration(&tx, 0, next_len);
1153 hdr->duration_id = cpu_to_le16(dur);
1154 }
1155 }
1156
1157retry:
1158 ret = __ieee80211_tx(local, skb, &tx);
1159 if (ret) {
1160 struct ieee80211_tx_stored_packet *store =
1161 &local->pending_packet[control->queue];
1162
1163 if (ret == IEEE80211_TX_FRAG_AGAIN)
1164 skb = NULL;
1165 set_bit(IEEE80211_LINK_STATE_PENDING,
1166 &local->state[control->queue]);
1167 smp_mb();
1168 /* When the driver gets out of buffers during sending of
1169 * fragments and calls ieee80211_stop_queue, there is
1170 * a small window between IEEE80211_LINK_STATE_XOFF and
1171 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1172 * gets available in that window (i.e. driver calls
1173 * ieee80211_wake_queue), we would end up with ieee80211_tx
1174 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1175 * continuing transmitting here when that situation is
1176 * possible to have happened. */
1177 if (!__ieee80211_queue_stopped(local, control->queue)) {
1178 clear_bit(IEEE80211_LINK_STATE_PENDING,
1179 &local->state[control->queue]);
1180 goto retry;
1181 }
1182 memcpy(&store->control, control,
1183 sizeof(struct ieee80211_tx_control));
1184 store->skb = skb;
1185 store->extra_frag = tx.u.tx.extra_frag;
1186 store->num_extra_frag = tx.u.tx.num_extra_frag;
1187 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1188 store->last_frag_rate = tx.u.tx.last_frag_rate;
badffb72
JS		 1189 store->last_frag_rate_ctrl_probe =
1190 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
e2ebc74d 1191 }
d4e46a3d 1192 rcu_read_unlock();
e2ebc74d
JB		 1193 return 0;
1194
1195 drop:
1196 if (skb)
1197 dev_kfree_skb(skb);
1198 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1199 if (tx.u.tx.extra_frag[i])
1200 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1201 kfree(tx.u.tx.extra_frag);
d4e46a3d 1202 rcu_read_unlock();
e2ebc74d
JB		 1203 return 0;
1204}
1205
1206/* device xmit handlers */
1207
1208int ieee80211_master_start_xmit(struct sk_buff *skb,
1209 struct net_device *dev)
1210{
1211 struct ieee80211_tx_control control;
1212 struct ieee80211_tx_packet_data *pkt_data;
1213 struct net_device *odev = NULL;
1214 struct ieee80211_sub_if_data *osdata;
1215 int headroom;
1216 int ret;
1217
1218 /*
1219 * copy control out of the skb so other people can use skb->cb
1220 */
1221 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1222 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1223
1224 if (pkt_data->ifindex)
881d966b 1225 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 1226 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1227 dev_put(odev);
1228 odev = NULL;
1229 }
1230 if (unlikely(!odev)) {
1231#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1232 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1233 "originating device\n", dev->name);
1234#endif
1235 dev_kfree_skb(skb);
1236 return 0;
1237 }
1238 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1239
1240 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1241 if (skb_headroom(skb) < headroom) {
1242 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1243 dev_kfree_skb(skb);
1244 dev_put(odev);
1245 return 0;
1246 }
1247 }
1248
1249 control.ifindex = odev->ifindex;
1250 control.type = osdata->type;
e8bf9649 1251 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
e2ebc74d 1252 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
e8bf9649 1253 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
e2ebc74d 1254 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
e8bf9649 1255 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
e2ebc74d
JB		 1256 control.flags |= IEEE80211_TXCTL_REQUEUE;
1257 control.queue = pkt_data->queue;
1258
f9d540ee 1259 ret = ieee80211_tx(odev, skb, &control);
e2ebc74d
JB		 1260 dev_put(odev);
1261
1262 return ret;
1263}
1264
1265int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1266 struct net_device *dev)
1267{
1268 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1269 struct ieee80211_tx_packet_data *pkt_data;
1270 struct ieee80211_radiotap_header *prthdr =
1271 (struct ieee80211_radiotap_header *)skb->data;
9b8a74e3 1272 u16 len_rthdr;
e2ebc74d 1273
9b8a74e3
AG		 1274 /* check for not even having the fixed radiotap header part */
1275 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1276 goto fail; /* too short to be possibly valid */
1277
1278 /* is it a header version we can trust to find length from? */
1279 if (unlikely(prthdr->it_version))
1280 goto fail; /* only version 0 is supported */
1281
1282 /* then there must be a radiotap header with a length we can use */
1283 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1284
1285 /* does the skb contain enough to deliver on the alleged length? */
1286 if (unlikely(skb->len < len_rthdr))
1287 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d
JB		 1288
1289 skb->dev = local->mdev;
1290
1291 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1292 memset(pkt_data, 0, sizeof(*pkt_data));
9b8a74e3 1293 /* needed because we set skb device to master */
e2ebc74d 1294 pkt_data->ifindex = dev->ifindex;
9b8a74e3 1295
e8bf9649 1296 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d 1297
e2ebc74d
JB		 1298 /*
1299 * fix up the pointers accounting for the radiotap
1300 * header still being in there. We are being given
1301 * a precooked IEEE80211 header so no need for
1302 * normal processing
1303 */
9b8a74e3 1304 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1305 /*
9b8a74e3
AG		 1306 * these are just fixed to the end of the rt area since we
1307 * don't have any better information and at this point, nobody cares
e2ebc74d 1308 */
9b8a74e3
AG		 1309 skb_set_network_header(skb, len_rthdr);
1310 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1311
9b8a74e3
AG		 1312 /* pass the radiotap header up to the next stage intact */
1313 dev_queue_xmit(skb);
e2ebc74d 1314 return NETDEV_TX_OK;
9b8a74e3
AG		 1315
1316fail:
1317 dev_kfree_skb(skb);
1318 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1319}
1320
1321/**
1322 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1323 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1324 * @skb: packet to be sent
1325 * @dev: incoming interface
1326 *
1327 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1328 * not be freed, and caller is responsible for either retrying later or freeing
1329 * skb).
1330 *
1331 * This function takes in an Ethernet header and encapsulates it with suitable
1332 * IEEE 802.11 header based on which interface the packet is coming in. The
1333 * encapsulated packet will then be passed to master interface, wlan#.11, for
1334 * transmission (through low-level driver).
1335 */
1336int ieee80211_subif_start_xmit(struct sk_buff *skb,
1337 struct net_device *dev)
1338{
1339 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1340 struct ieee80211_tx_packet_data *pkt_data;
1341 struct ieee80211_sub_if_data *sdata;
1342 int ret = 1, head_need;
1343 u16 ethertype, hdrlen, fc;
1344 struct ieee80211_hdr hdr;
1345 const u8 *encaps_data;
1346 int encaps_len, skip_header_bytes;
e8bf9649 1347 int nh_pos, h_pos;
e2ebc74d
JB		 1348 struct sta_info *sta;
1349
1350 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1351 if (unlikely(skb->len < ETH_HLEN)) {
1352 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1353 dev->name, skb->len);
1354 ret = 0;
1355 goto fail;
1356 }
1357
1358 nh_pos = skb_network_header(skb) - skb->data;
1359 h_pos = skb_transport_header(skb) - skb->data;
1360
1361 /* convert Ethernet header to proper 802.11 header (based on
1362 * operation mode) */
1363 ethertype = (skb->data[12] << 8) | skb->data[13];
1364 /* TODO: handling for 802.1x authorized/unauthorized port */
1365 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1366
cf966838
JB		 1367 switch (sdata->type) {
1368 case IEEE80211_IF_TYPE_AP:
1369 case IEEE80211_IF_TYPE_VLAN:
e2ebc74d
JB		 1370 fc |= IEEE80211_FCTL_FROMDS;
1371 /* DA BSSID SA */
1372 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1373 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1374 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1375 hdrlen = 24;
cf966838
JB		 1376 break;
1377 case IEEE80211_IF_TYPE_WDS:
e2ebc74d
JB		 1378 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1379 /* RA TA DA SA */
1380 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1381 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1382 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1383 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1384 hdrlen = 30;
cf966838
JB		 1385 break;
1386 case IEEE80211_IF_TYPE_STA:
e2ebc74d
JB		 1387 fc |= IEEE80211_FCTL_TODS;
1388 /* BSSID SA DA */
1389 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1390 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1391 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1392 hdrlen = 24;
cf966838
JB		 1393 break;
1394 case IEEE80211_IF_TYPE_IBSS:
e2ebc74d
JB		 1395 /* DA SA BSSID */
1396 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1397 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1398 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1399 hdrlen = 24;
cf966838
JB		 1400 break;
1401 default:
e2ebc74d
JB		 1402 ret = 0;
1403 goto fail;
1404 }
1405
1406 /* receiver is QoS enabled, use a QoS type frame */
1407 sta = sta_info_get(local, hdr.addr1);
1408 if (sta) {
1409 if (sta->flags & WLAN_STA_WME) {
1410 fc |= IEEE80211_STYPE_QOS_DATA;
1411 hdrlen += 2;
1412 }
1413 sta_info_put(sta);
1414 }
1415
1416 hdr.frame_control = cpu_to_le16(fc);
1417 hdr.duration_id = 0;
1418 hdr.seq_ctrl = 0;
1419
1420 skip_header_bytes = ETH_HLEN;
1421 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1422 encaps_data = bridge_tunnel_header;
1423 encaps_len = sizeof(bridge_tunnel_header);
1424 skip_header_bytes -= 2;
1425 } else if (ethertype >= 0x600) {
1426 encaps_data = rfc1042_header;
1427 encaps_len = sizeof(rfc1042_header);
1428 skip_header_bytes -= 2;
1429 } else {
1430 encaps_data = NULL;
1431 encaps_len = 0;
1432 }
1433
1434 skb_pull(skb, skip_header_bytes);
1435 nh_pos -= skip_header_bytes;
1436 h_pos -= skip_header_bytes;
1437
1438 /* TODO: implement support for fragments so that there is no need to
1439 * reallocate and copy payload; it might be enough to support one
1440 * extra fragment that would be copied in the beginning of the frame
1441 * data.. anyway, it would be nice to include this into skb structure
1442 * somehow
1443 *
1444 * There are few options for this:
1445 * use skb->cb as an extra space for 802.11 header
1446 * allocate new buffer if not enough headroom
1447 * make sure that there is enough headroom in every skb by increasing
1448 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1449 * alloc_skb() (net/core/skbuff.c)
1450 */
1451 head_need = hdrlen + encaps_len + local->tx_headroom;
1452 head_need -= skb_headroom(skb);
1453
1454 /* We are going to modify skb data, so make a copy of it if happens to
1455 * be cloned. This could happen, e.g., with Linux bridge code passing
1456 * us broadcast frames. */
1457
1458 if (head_need > 0 || skb_cloned(skb)) {
1459#if 0
1460 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1461 "of headroom\n", dev->name, head_need);
1462#endif
1463
1464 if (skb_cloned(skb))
1465 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1466 else
1467 I802_DEBUG_INC(local->tx_expand_skb_head);
1468 /* Since we have to reallocate the buffer, make sure that there
1469 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1470 * before payload and 12 after). */
1471 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1472 12, GFP_ATOMIC)) {
1473 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1474 "\n", dev->name);
1475 goto fail;
1476 }
1477 }
1478
1479 if (encaps_data) {
1480 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1481 nh_pos += encaps_len;
1482 h_pos += encaps_len;
1483 }
c29b9b9b
JB		 1484
1485 if (fc & IEEE80211_STYPE_QOS_DATA) {
1486 __le16 *qos_control;
1487
1488 qos_control = (__le16*) skb_push(skb, 2);
1489 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1490 /*
1491 * Maybe we could actually set some fields here, for now just
1492 * initialise to zero to indicate no special operation.
1493 */
1494 *qos_control = 0;
1495 } else
1496 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1497
e2ebc74d
JB		 1498 nh_pos += hdrlen;
1499 h_pos += hdrlen;
1500
1501 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1502 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1503 pkt_data->ifindex = dev->ifindex;
e2ebc74d
JB		 1504
1505 skb->dev = local->mdev;
68aae116
SH		 1506 dev->stats.tx_packets++;
1507 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 1508
1509 /* Update skb pointers to various headers since this modified frame
1510 * is going to go through Linux networking code that may potentially
1511 * need things like pointer to IP header. */
1512 skb_set_mac_header(skb, 0);
1513 skb_set_network_header(skb, nh_pos);
1514 skb_set_transport_header(skb, h_pos);
1515
1516 dev->trans_start = jiffies;
1517 dev_queue_xmit(skb);
1518
1519 return 0;
1520
1521 fail:
1522 if (!ret)
1523 dev_kfree_skb(skb);
1524
1525 return ret;
1526}
1527
e2ebc74d
JB		 1528/* helper functions for pending packets for when queues are stopped */
1529
1530void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1531{
1532 int i, j;
1533 struct ieee80211_tx_stored_packet *store;
1534
1535 for (i = 0; i < local->hw.queues; i++) {
1536 if (!__ieee80211_queue_pending(local, i))
1537 continue;
1538 store = &local->pending_packet[i];
1539 kfree_skb(store->skb);
1540 for (j = 0; j < store->num_extra_frag; j++)
1541 kfree_skb(store->extra_frag[j]);
1542 kfree(store->extra_frag);
1543 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1544 }
1545}
1546
1547void ieee80211_tx_pending(unsigned long data)
1548{
1549 struct ieee80211_local *local = (struct ieee80211_local *)data;
1550 struct net_device *dev = local->mdev;
1551 struct ieee80211_tx_stored_packet *store;
1552 struct ieee80211_txrx_data tx;
1553 int i, ret, reschedule = 0;
1554
1555 netif_tx_lock_bh(dev);
1556 for (i = 0; i < local->hw.queues; i++) {
1557 if (__ieee80211_queue_stopped(local, i))
1558 continue;
1559 if (!__ieee80211_queue_pending(local, i)) {
1560 reschedule = 1;
1561 continue;
1562 }
1563 store = &local->pending_packet[i];
1564 tx.u.tx.control = &store->control;
1565 tx.u.tx.extra_frag = store->extra_frag;
1566 tx.u.tx.num_extra_frag = store->num_extra_frag;
1567 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1568 tx.u.tx.last_frag_rate = store->last_frag_rate;
badffb72
JS		 1569 tx.flags = 0;
1570 if (store->last_frag_rate_ctrl_probe)
1571 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 1572 ret = __ieee80211_tx(local, store->skb, &tx);
1573 if (ret) {
1574 if (ret == IEEE80211_TX_FRAG_AGAIN)
1575 store->skb = NULL;
1576 } else {
1577 clear_bit(IEEE80211_LINK_STATE_PENDING,
1578 &local->state[i]);
1579 reschedule = 1;
1580 }
1581 }
1582 netif_tx_unlock_bh(dev);
1583 if (reschedule) {
1584 if (!ieee80211_qdisc_installed(dev)) {
1585 if (!__ieee80211_queue_stopped(local, 0))
1586 netif_wake_queue(dev);
1587 } else
1588 netif_schedule(dev);
1589 }
1590}
1591
1592/* functions for drivers to get certain frames */
1593
1594static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1595 struct ieee80211_if_ap *bss,
1596 struct sk_buff *skb)
1597{
1598 u8 *pos, *tim;
1599 int aid0 = 0;
1600 int i, have_bits = 0, n1, n2;
1601
1602 /* Generate bitmap for TIM only if there are any STAs in power save
1603 * mode. */
be8755e1 1604 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 1605 if (atomic_read(&bss->num_sta_ps) > 0)
1606 /* in the hope that this is faster than
1607 * checking byte-for-byte */
1608 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1609 IEEE80211_MAX_AID+1);
1610
1611 if (bss->dtim_count == 0)
1612 bss->dtim_count = bss->dtim_period - 1;
1613 else
1614 bss->dtim_count--;
1615
1616 tim = pos = (u8 *) skb_put(skb, 6);
1617 *pos++ = WLAN_EID_TIM;
1618 *pos++ = 4;
1619 *pos++ = bss->dtim_count;
1620 *pos++ = bss->dtim_period;
1621
1622 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1623 aid0 = 1;
1624
1625 if (have_bits) {
1626 /* Find largest even number N1 so that bits numbered 1 through
1627 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1628 * (N2 + 1) x 8 through 2007 are 0. */
1629 n1 = 0;
1630 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1631 if (bss->tim[i]) {
1632 n1 = i & 0xfe;
1633 break;
1634 }
1635 }
1636 n2 = n1;
1637 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1638 if (bss->tim[i]) {
1639 n2 = i;
1640 break;
1641 }
1642 }
1643
1644 /* Bitmap control */
1645 *pos++ = n1 | aid0;
1646 /* Part Virt Bitmap */
1647 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1648
1649 tim[1] = n2 - n1 + 4;
1650 skb_put(skb, n2 - n1);
1651 } else {
1652 *pos++ = aid0; /* Bitmap control */
1653 *pos++ = 0; /* Part Virt Bitmap */
1654 }
be8755e1 1655 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 1656}
1657
1658struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1659 struct ieee80211_tx_control *control)
1660{
1661 struct ieee80211_local *local = hw_to_local(hw);
1662 struct sk_buff *skb;
1663 struct net_device *bdev;
1664 struct ieee80211_sub_if_data *sdata = NULL;
1665 struct ieee80211_if_ap *ap = NULL;
1abbe498 1666 struct rate_selection rsel;
e2ebc74d
JB		 1667 u8 *b_head, *b_tail;
1668 int bh_len, bt_len;
1669
881d966b 1670 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1671 if (bdev) {
1672 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1673 ap = &sdata->u.ap;
1674 dev_put(bdev);
1675 }
1676
1677 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1678 !ap->beacon_head) {
1679#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1680 if (net_ratelimit())
1681 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1682 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1683#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1684 return NULL;
1685 }
1686
1687 /* Assume we are generating the normal beacon locally */
1688 b_head = ap->beacon_head;
1689 b_tail = ap->beacon_tail;
1690 bh_len = ap->beacon_head_len;
1691 bt_len = ap->beacon_tail_len;
1692
1693 skb = dev_alloc_skb(local->tx_headroom +
1694 bh_len + bt_len + 256 /* maximum TIM len */);
1695 if (!skb)
1696 return NULL;
1697
1698 skb_reserve(skb, local->tx_headroom);
1699 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1700
1701 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1702
1703 ieee80211_beacon_add_tim(local, ap, skb);
1704
1705 if (b_tail) {
1706 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1707 }
1708
1709 if (control) {
1abbe498
MN		 1710 rate_control_get_rate(local->mdev, local->oper_hw_mode, skb,
1711 &rsel);
1712 if (!rsel.rate) {
e2ebc74d 1713 if (net_ratelimit()) {
1abbe498
MN		 1714 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1715 "no rate found\n",
1716 wiphy_name(local->hw.wiphy));
e2ebc74d
JB		 1717 }
1718 dev_kfree_skb(skb);
1719 return NULL;
1720 }
1721
13262ffd
JS		 1722 control->tx_rate =
1723 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1abbe498
MN		 1724 (rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1725 rsel.rate->val2 : rsel.rate->val;
e2ebc74d
JB		 1726 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1727 control->power_level = local->hw.conf.power_level;
1728 control->flags |= IEEE80211_TXCTL_NO_ACK;
1729 control->retry_limit = 1;
1730 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1731 }
1732
1733 ap->num_beacons++;
1734 return skb;
1735}
1736EXPORT_SYMBOL(ieee80211_beacon_get);
1737
7e9ed188 1738void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1739 const void *frame, size_t frame_len,
1740 const struct ieee80211_tx_control *frame_txctl,
1741 struct ieee80211_rts *rts)
1742{
1743 const struct ieee80211_hdr *hdr = frame;
1744 u16 fctl;
1745
1746 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1747 rts->frame_control = cpu_to_le16(fctl);
7e9ed188 1748 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1749 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1750 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1751}
1752EXPORT_SYMBOL(ieee80211_rts_get);
1753
7e9ed188 1754void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1755 const void *frame, size_t frame_len,
1756 const struct ieee80211_tx_control *frame_txctl,
1757 struct ieee80211_cts *cts)
1758{
1759 const struct ieee80211_hdr *hdr = frame;
1760 u16 fctl;
1761
1762 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1763 cts->frame_control = cpu_to_le16(fctl);
7e9ed188 1764 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1765 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1766}
1767EXPORT_SYMBOL(ieee80211_ctstoself_get);
1768
1769struct sk_buff *
1770ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1771 struct ieee80211_tx_control *control)
1772{
1773 struct ieee80211_local *local = hw_to_local(hw);
1774 struct sk_buff *skb;
1775 struct sta_info *sta;
1776 ieee80211_tx_handler *handler;
1777 struct ieee80211_txrx_data tx;
1778 ieee80211_txrx_result res = TXRX_DROP;
1779 struct net_device *bdev;
1780 struct ieee80211_sub_if_data *sdata;
1781 struct ieee80211_if_ap *bss = NULL;
1782
881d966b 1783 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1784 if (bdev) {
1785 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1786 bss = &sdata->u.ap;
1787 dev_put(bdev);
1788 }
1789 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1790 return NULL;
1791
1792 if (bss->dtim_count != 0)
1793 return NULL; /* send buffered bc/mc only after DTIM beacon */
1794 memset(control, 0, sizeof(*control));
1795 while (1) {
1796 skb = skb_dequeue(&bss->ps_bc_buf);
1797 if (!skb)
1798 return NULL;
1799 local->total_ps_buffered--;
1800
1801 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1802 struct ieee80211_hdr *hdr =
1803 (struct ieee80211_hdr *) skb->data;
1804 /* more buffered multicast/broadcast frames ==> set
1805 * MoreData flag in IEEE 802.11 header to inform PS
1806 * STAs */
1807 hdr->frame_control |=
1808 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1809 }
1810
58d4185e 1811 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
e2ebc74d
JB		 1812 break;
1813 dev_kfree_skb_any(skb);
1814 }
1815 sta = tx.sta;
badffb72 1816 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
475fa49c 1817 tx.u.tx.mode = local->hw.conf.mode;
e2ebc74d
JB		 1818
1819 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1820 res = (*handler)(&tx);
1821 if (res == TXRX_DROP || res == TXRX_QUEUED)
1822 break;
1823 }
1824 dev_put(tx.dev);
1825 skb = tx.skb; /* handlers are allowed to change skb */
1826
1827 if (res == TXRX_DROP) {
1828 I802_DEBUG_INC(local->tx_handlers_drop);
1829 dev_kfree_skb(skb);
1830 skb = NULL;
1831 } else if (res == TXRX_QUEUED) {
1832 I802_DEBUG_INC(local->tx_handlers_queued);
1833 skb = NULL;
1834 }
1835
1836 if (sta)
1837 sta_info_put(sta);
1838
1839 return skb;
1840}
1841EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux 6.x block layer and io_uring tree(s)