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mac80211: make ieee80211_rx_mgmt_action static
[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
e2ebc74d
JB		 264 return TXRX_CONTINUE;
265}
266
267static ieee80211_txrx_result
268ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
269{
270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
271
272 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
273 ieee80211_include_sequence(tx->sdata, hdr);
274
275 return TXRX_CONTINUE;
276}
277
278/* This function is called whenever the AP is about to exceed the maximum limit
279 * of buffered frames for power saving STAs. This situation should not really
280 * happen often during normal operation, so dropping the oldest buffered packet
281 * from each queue should be OK to make some room for new frames. */
282static void purge_old_ps_buffers(struct ieee80211_local *local)
283{
284 int total = 0, purged = 0;
285 struct sk_buff *skb;
286 struct ieee80211_sub_if_data *sdata;
287 struct sta_info *sta;
288
79010420
JB		 289 /*
290 * virtual interfaces are protected by RCU
291 */
292 rcu_read_lock();
293
294 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
e2ebc74d
JB		 295 struct ieee80211_if_ap *ap;
296 if (sdata->dev == local->mdev ||
297 sdata->type != IEEE80211_IF_TYPE_AP)
298 continue;
299 ap = &sdata->u.ap;
300 skb = skb_dequeue(&ap->ps_bc_buf);
301 if (skb) {
302 purged++;
303 dev_kfree_skb(skb);
304 }
305 total += skb_queue_len(&ap->ps_bc_buf);
306 }
79010420 307 rcu_read_unlock();
e2ebc74d 308
be8755e1 309 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 310 list_for_each_entry(sta, &local->sta_list, list) {
311 skb = skb_dequeue(&sta->ps_tx_buf);
312 if (skb) {
313 purged++;
314 dev_kfree_skb(skb);
315 }
316 total += skb_queue_len(&sta->ps_tx_buf);
317 }
be8755e1 318 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 319
320 local->total_ps_buffered = total;
321 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
dd1cd4c6 322 wiphy_name(local->hw.wiphy), purged);
e2ebc74d
JB		 323}
324
325static inline ieee80211_txrx_result
326ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
327{
328 /* broadcast/multicast frame */
329 /* If any of the associated stations is in power save mode,
330 * the frame is buffered to be sent after DTIM beacon frame */
331 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
332 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
333 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
334 !(tx->fc & IEEE80211_FCTL_ORDER)) {
335 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
336 purge_old_ps_buffers(tx->local);
337 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
338 AP_MAX_BC_BUFFER) {
339 if (net_ratelimit()) {
340 printk(KERN_DEBUG "%s: BC TX buffer full - "
341 "dropping the oldest frame\n",
342 tx->dev->name);
343 }
344 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
345 } else
346 tx->local->total_ps_buffered++;
347 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
348 return TXRX_QUEUED;
349 }
350
351 return TXRX_CONTINUE;
352}
353
354static inline ieee80211_txrx_result
355ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
356{
357 struct sta_info *sta = tx->sta;
0795af57 358 DECLARE_MAC_BUF(mac);
e2ebc74d
JB		 359
360 if (unlikely(!sta ||
361 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
362 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
363 return TXRX_CONTINUE;
364
365 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
366 struct ieee80211_tx_packet_data *pkt_data;
367#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 368 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
e2ebc74d 369 "before %d)\n",
0795af57 370 print_mac(mac, sta->addr), sta->aid,
e2ebc74d
JB		 371 skb_queue_len(&sta->ps_tx_buf));
372#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
373 sta->flags |= WLAN_STA_TIM;
374 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
375 purge_old_ps_buffers(tx->local);
376 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
377 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
378 if (net_ratelimit()) {
0795af57 379 printk(KERN_DEBUG "%s: STA %s TX "
e2ebc74d 380 "buffer full - dropping oldest frame\n",
0795af57 381 tx->dev->name, print_mac(mac, sta->addr));
e2ebc74d
JB		 382 }
383 dev_kfree_skb(old);
384 } else
385 tx->local->total_ps_buffered++;
386 /* Queue frame to be sent after STA sends an PS Poll frame */
387 if (skb_queue_empty(&sta->ps_tx_buf)) {
388 if (tx->local->ops->set_tim)
389 tx->local->ops->set_tim(local_to_hw(tx->local),
390 sta->aid, 1);
391 if (tx->sdata->bss)
392 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
393 }
394 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
395 pkt_data->jiffies = jiffies;
396 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
397 return TXRX_QUEUED;
398 }
399#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
400 else if (unlikely(sta->flags & WLAN_STA_PS)) {
0795af57 401 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
e2ebc74d 402 "set -> send frame\n", tx->dev->name,
0795af57 403 print_mac(mac, sta->addr));
e2ebc74d
JB		 404 }
405#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
406 sta->pspoll = 0;
407
408 return TXRX_CONTINUE;
409}
410
e2ebc74d
JB		 411static ieee80211_txrx_result
412ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
413{
badffb72 414 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
e2ebc74d
JB		 415 return TXRX_CONTINUE;
416
badffb72 417 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
e2ebc74d
JB		 418 return ieee80211_tx_h_unicast_ps_buf(tx);
419 else
420 return ieee80211_tx_h_multicast_ps_buf(tx);
421}
422
e2ebc74d
JB		 423static ieee80211_txrx_result
424ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
425{
d4e46a3d 426 struct ieee80211_key *key;
76ee65bf
RR		 427 const struct ieee80211_hdr *hdr;
428 u16 fc;
429
430 hdr = (const struct ieee80211_hdr *) tx->skb->data;
431 fc = le16_to_cpu(hdr->frame_control);
d4e46a3d 432
e2ebc74d
JB		 433 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
434 tx->key = NULL;
d4e46a3d
JB		 435 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
436 tx->key = key;
437 else if ((key = rcu_dereference(tx->sdata->default_key)))
438 tx->key = key;
e2ebc74d 439 else if (tx->sdata->drop_unencrypted &&
678f5f71
JB		 440 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
441 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
e2ebc74d
JB		 442 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
443 return TXRX_DROP;
6a7664d4 444 } else {
e2ebc74d 445 tx->key = NULL;
6a7664d4
JB		 446 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
447 }
e2ebc74d
JB		 448
449 if (tx->key) {
450 tx->key->tx_rx_count++;
011bfcc4 451 /* TODO: add threshold stuff again */
e2ebc74d
JB		 452 }
453
454 return TXRX_CONTINUE;
455}
456
457static ieee80211_txrx_result
458ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
459{
460 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
461 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
462 struct sk_buff **frags, *first, *frag;
463 int i;
464 u16 seq;
465 u8 *pos;
466 int frag_threshold = tx->local->fragmentation_threshold;
467
badffb72 468 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
e2ebc74d
JB		 469 return TXRX_CONTINUE;
470
471 first = tx->skb;
472
473 hdrlen = ieee80211_get_hdrlen(tx->fc);
474 payload_len = first->len - hdrlen;
475 per_fragm = frag_threshold - hdrlen - FCS_LEN;
172589cc 476 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
e2ebc74d
JB		 477
478 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
479 if (!frags)
480 goto fail;
481
482 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
483 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
484 pos = first->data + hdrlen + per_fragm;
485 left = payload_len - per_fragm;
486 for (i = 0; i < num_fragm - 1; i++) {
487 struct ieee80211_hdr *fhdr;
488 size_t copylen;
489
490 if (left <= 0)
491 goto fail;
492
493 /* reserve enough extra head and tail room for possible
494 * encryption */
495 frag = frags[i] =
496 dev_alloc_skb(tx->local->tx_headroom +
497 frag_threshold +
498 IEEE80211_ENCRYPT_HEADROOM +
499 IEEE80211_ENCRYPT_TAILROOM);
500 if (!frag)
501 goto fail;
502 /* Make sure that all fragments use the same priority so
503 * that they end up using the same TX queue */
504 frag->priority = first->priority;
505 skb_reserve(frag, tx->local->tx_headroom +
506 IEEE80211_ENCRYPT_HEADROOM);
507 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
508 memcpy(fhdr, first->data, hdrlen);
509 if (i == num_fragm - 2)
510 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
511 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
512 copylen = left > per_fragm ? per_fragm : left;
513 memcpy(skb_put(frag, copylen), pos, copylen);
514
515 pos += copylen;
516 left -= copylen;
517 }
518 skb_trim(first, hdrlen + per_fragm);
519
520 tx->u.tx.num_extra_frag = num_fragm - 1;
521 tx->u.tx.extra_frag = frags;
522
523 return TXRX_CONTINUE;
524
525 fail:
526 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
527 if (frags) {
528 for (i = 0; i < num_fragm - 1; i++)
529 if (frags[i])
530 dev_kfree_skb(frags[i]);
531 kfree(frags);
532 }
533 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
534 return TXRX_DROP;
535}
536
e2ebc74d 537static ieee80211_txrx_result
6a22a59d 538ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
e2ebc74d 539{
6a22a59d 540 if (!tx->key)
e2ebc74d
JB		 541 return TXRX_CONTINUE;
542
6a22a59d
JB		 543 switch (tx->key->conf.alg) {
544 case ALG_WEP:
545 return ieee80211_crypto_wep_encrypt(tx);
546 case ALG_TKIP:
547 return ieee80211_crypto_tkip_encrypt(tx);
548 case ALG_CCMP:
549 return ieee80211_crypto_ccmp_encrypt(tx);
e2ebc74d
JB		 550 }
551
6a22a59d
JB		 552 /* not reached */
553 WARN_ON(1);
554 return TXRX_DROP;
e2ebc74d
JB		 555}
556
557static ieee80211_txrx_result
558ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
559{
1abbe498 560 struct rate_selection rsel;
e2ebc74d 561
58d4185e 562 if (likely(!tx->u.tx.rate)) {
1abbe498
MN		 563 rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel);
564 tx->u.tx.rate = rsel.rate;
565 if (unlikely(rsel.probe != NULL)) {
58d4185e
JB		 566 tx->u.tx.control->flags |=
567 IEEE80211_TXCTL_RATE_CTRL_PROBE;
568 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
569 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
1abbe498 570 tx->u.tx.rate = rsel.probe;
58d4185e
JB		 571 } else
572 tx->u.tx.control->alt_retry_rate = -1;
573
574 if (!tx->u.tx.rate)
575 return TXRX_DROP;
576 } else
e2ebc74d 577 tx->u.tx.control->alt_retry_rate = -1;
58d4185e 578
e2ebc74d 579 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
13262ffd 580 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
1abbe498 581 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
e2ebc74d 582 tx->u.tx.last_frag_rate = tx->u.tx.rate;
1abbe498 583 if (rsel.probe)
badffb72
JS		 584 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
585 else
586 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1abbe498
MN		 587 tx->u.tx.rate = rsel.nonerp;
588 tx->u.tx.control->rate = rsel.nonerp;
e2ebc74d
JB		 589 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
590 } else {
591 tx->u.tx.last_frag_rate = tx->u.tx.rate;
592 tx->u.tx.control->rate = tx->u.tx.rate;
593 }
594 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
e2ebc74d
JB		 595
596 return TXRX_CONTINUE;
597}
598
599static ieee80211_txrx_result
600ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
601{
602 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
7e9ed188 603 u16 fc = le16_to_cpu(hdr->frame_control);
e2ebc74d
JB		 604 u16 dur;
605 struct ieee80211_tx_control *control = tx->u.tx.control;
606 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
607
58d4185e
JB		 608 if (!control->retry_limit) {
609 if (!is_multicast_ether_addr(hdr->addr1)) {
610 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
611 && tx->local->rts_threshold <
612 IEEE80211_MAX_RTS_THRESHOLD) {
613 control->flags |=
614 IEEE80211_TXCTL_USE_RTS_CTS;
615 control->flags |=
616 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
617 control->retry_limit =
618 tx->local->long_retry_limit;
619 } else {
620 control->retry_limit =
621 tx->local->short_retry_limit;
622 }
e2ebc74d 623 } else {
58d4185e 624 control->retry_limit = 1;
e2ebc74d 625 }
e2ebc74d
JB		 626 }
627
badffb72 628 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
e2ebc74d
JB		 629 /* Do not use multiple retry rates when sending fragmented
630 * frames.
631 * TODO: The last fragment could still use multiple retry
632 * rates. */
633 control->alt_retry_rate = -1;
634 }
635
636 /* Use CTS protection for unicast frames sent using extended rates if
637 * there are associated non-ERP stations and RTS/CTS is not configured
638 * for the frame. */
639 if (mode->mode == MODE_IEEE80211G &&
640 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
badffb72 641 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
13262ffd 642 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
e2ebc74d
JB		 643 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
644 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
645
7e9ed188
DD		 646 /* Transmit data frames using short preambles if the driver supports
647 * short preambles at the selected rate and short preambles are
648 * available on the network at the current point in time. */
649 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
650 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
13262ffd 651 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
7e9ed188
DD		 652 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
653 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
654 }
655
e2ebc74d
JB		 656 /* Setup duration field for the first fragment of the frame. Duration
657 * for remaining fragments will be updated when they are being sent
658 * to low-level driver in ieee80211_tx(). */
659 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
badffb72
JS		 660 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
661 tx->u.tx.extra_frag[0]->len : 0);
e2ebc74d
JB		 662 hdr->duration_id = cpu_to_le16(dur);
663
664 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
665 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
666 struct ieee80211_rate *rate;
667
668 /* Do not use multiple retry rates when using RTS/CTS */
669 control->alt_retry_rate = -1;
670
671 /* Use min(data rate, max base rate) as CTS/RTS rate */
672 rate = tx->u.tx.rate;
673 while (rate > mode->rates &&
674 !(rate->flags & IEEE80211_RATE_BASIC))
675 rate--;
676
677 control->rts_cts_rate = rate->val;
678 control->rts_rate = rate;
679 }
680
681 if (tx->sta) {
682 tx->sta->tx_packets++;
683 tx->sta->tx_fragments++;
684 tx->sta->tx_bytes += tx->skb->len;
685 if (tx->u.tx.extra_frag) {
686 int i;
687 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
688 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
689 tx->sta->tx_bytes +=
690 tx->u.tx.extra_frag[i]->len;
691 }
692 }
693 }
694
6a7664d4
JB		 695 /*
696 * Tell hardware to not encrypt when we had sw crypto.
697 * Because we use the same flag to internally indicate that
698 * no (software) encryption should be done, we have to set it
699 * after all crypto handlers.
700 */
701 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
702 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
703
e2ebc74d
JB		 704 return TXRX_CONTINUE;
705}
706
707static ieee80211_txrx_result
708ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
709{
710 struct ieee80211_local *local = tx->local;
711 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
712 struct sk_buff *skb = tx->skb;
713 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
714 u32 load = 0, hdrtime;
715
716 /* TODO: this could be part of tx_status handling, so that the number
717 * of retries would be known; TX rate should in that case be stored
718 * somewhere with the packet */
719
720 /* Estimate total channel use caused by this frame */
721
722 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
723 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
724
725 if (mode->mode == MODE_IEEE80211A ||
e2ebc74d
JB		 726 (mode->mode == MODE_IEEE80211G &&
727 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
728 hdrtime = CHAN_UTIL_HDR_SHORT;
729 else
730 hdrtime = CHAN_UTIL_HDR_LONG;
731
732 load = hdrtime;
733 if (!is_multicast_ether_addr(hdr->addr1))
734 load += hdrtime;
735
736 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
737 load += 2 * hdrtime;
738 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
739 load += hdrtime;
740
741 load += skb->len * tx->u.tx.rate->rate_inv;
742
743 if (tx->u.tx.extra_frag) {
744 int i;
745 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
746 load += 2 * hdrtime;
747 load += tx->u.tx.extra_frag[i]->len *
748 tx->u.tx.rate->rate;
749 }
750 }
751
752 /* Divide channel_use by 8 to avoid wrapping around the counter */
753 load >>= CHAN_UTIL_SHIFT;
754 local->channel_use_raw += load;
755 if (tx->sta)
756 tx->sta->channel_use_raw += load;
757 tx->sdata->channel_use_raw += load;
758
759 return TXRX_CONTINUE;
760}
761
762/* TODO: implement register/unregister functions for adding TX/RX handlers
763 * into ordered list */
764
765ieee80211_tx_handler ieee80211_tx_handlers[] =
766{
767 ieee80211_tx_h_check_assoc,
768 ieee80211_tx_h_sequence,
769 ieee80211_tx_h_ps_buf,
770 ieee80211_tx_h_select_key,
771 ieee80211_tx_h_michael_mic_add,
772 ieee80211_tx_h_fragment,
6a22a59d 773 ieee80211_tx_h_encrypt,
e2ebc74d
JB		 774 ieee80211_tx_h_rate_ctrl,
775 ieee80211_tx_h_misc,
776 ieee80211_tx_h_load_stats,
777 NULL
778};
779
780/* actual transmit path */
781
782/*
783 * deal with packet injection down monitor interface
784 * with Radiotap Header -- only called for monitor mode interface
785 */
786static ieee80211_txrx_result
58d4185e
JB		 787__ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
788 struct sk_buff *skb)
e2ebc74d
JB		 789{
790 /*
791 * this is the moment to interpret and discard the radiotap header that
792 * must be at the start of the packet injected in Monitor mode
793 *
794 * Need to take some care with endian-ness since radiotap
795 * args are little-endian
796 */
797
798 struct ieee80211_radiotap_iterator iterator;
799 struct ieee80211_radiotap_header *rthdr =
800 (struct ieee80211_radiotap_header *) skb->data;
801 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
802 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
58d4185e 803 struct ieee80211_tx_control *control = tx->u.tx.control;
e2ebc74d 804
58d4185e
JB		 805 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
806 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
807 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 808
809 /*
810 * for every radiotap entry that is present
811 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
812 * entries present, or -EINVAL on error)
813 */
814
815 while (!ret) {
816 int i, target_rate;
817
818 ret = ieee80211_radiotap_iterator_next(&iterator);
819
820 if (ret)
821 continue;
822
823 /* see if this argument is something we can use */
824 switch (iterator.this_arg_index) {
825 /*
826 * You must take care when dereferencing iterator.this_arg
827 * for multibyte types... the pointer is not aligned. Use
828 * get_unaligned((type *)iterator.this_arg) to dereference
829 * iterator.this_arg for type "type" safely on all arches.
830 */
831 case IEEE80211_RADIOTAP_RATE:
832 /*
833 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
834 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
835 */
836 target_rate = (*iterator.this_arg) * 5;
837 for (i = 0; i < mode->num_rates; i++) {
838 struct ieee80211_rate *r = &mode->rates[i];
839
58d4185e
JB		 840 if (r->rate == target_rate) {
841 tx->u.tx.rate = r;
842 break;
843 }
e2ebc74d
JB		 844 }
845 break;
846
847 case IEEE80211_RADIOTAP_ANTENNA:
848 /*
849 * radiotap uses 0 for 1st ant, mac80211 is 1 for
850 * 1st ant
851 */
852 control->antenna_sel_tx = (*iterator.this_arg) + 1;
853 break;
854
855 case IEEE80211_RADIOTAP_DBM_TX_POWER:
856 control->power_level = *iterator.this_arg;
857 break;
858
859 case IEEE80211_RADIOTAP_FLAGS:
860 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
861 /*
862 * this indicates that the skb we have been
863 * handed has the 32-bit FCS CRC at the end...
864 * we should react to that by snipping it off
865 * because it will be recomputed and added
866 * on transmission
867 */
868 if (skb->len < (iterator.max_length + FCS_LEN))
869 return TXRX_DROP;
870
871 skb_trim(skb, skb->len - FCS_LEN);
872 }
58d4185e
JB		 873 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
874 control->flags &=
875 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
876 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
877 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 878 break;
879
58d4185e
JB		 880 /*
881 * Please update the file
882 * Documentation/networking/mac80211-injection.txt
883 * when parsing new fields here.
884 */
885
e2ebc74d
JB		 886 default:
887 break;
888 }
889 }
890
891 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
892 return TXRX_DROP;
893
894 /*
895 * remove the radiotap header
896 * iterator->max_length was sanity-checked against
897 * skb->len by iterator init
898 */
899 skb_pull(skb, iterator.max_length);
900
901 return TXRX_CONTINUE;
902}
903
58d4185e
JB		 904/*
905 * initialises @tx
906 */
907static ieee80211_txrx_result
e2ebc74d
JB		 908__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
909 struct sk_buff *skb,
910 struct net_device *dev,
911 struct ieee80211_tx_control *control)
912{
913 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
58d4185e 914 struct ieee80211_hdr *hdr;
e2ebc74d
JB		 915 struct ieee80211_sub_if_data *sdata;
916 ieee80211_txrx_result res = TXRX_CONTINUE;
917
918 int hdrlen;
919
920 memset(tx, 0, sizeof(*tx));
921 tx->skb = skb;
922 tx->dev = dev; /* use original interface */
923 tx->local = local;
924 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
58d4185e 925 tx->u.tx.control = control;
e2ebc74d 926 /*
58d4185e
JB		 927 * Set this flag (used below to indicate "automatic fragmentation"),
928 * it will be cleared/left by radiotap as desired.
e2ebc74d 929 */
58d4185e 930 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 931
932 /* process and remove the injection radiotap header */
933 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
934 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
58d4185e 935 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
e2ebc74d 936 return TXRX_DROP;
58d4185e 937
e2ebc74d 938 /*
58d4185e
JB		 939 * __ieee80211_parse_tx_radiotap has now removed
940 * the radiotap header that was present and pre-filled
941 * 'tx' with tx control information.
e2ebc74d 942 */
e2ebc74d
JB		 943 }
944
58d4185e
JB		 945 hdr = (struct ieee80211_hdr *) skb->data;
946
24338793 947 tx->sta = sta_info_get(local, hdr->addr1);
948 tx->fc = le16_to_cpu(hdr->frame_control);
58d4185e 949
badffb72
JS		 950 if (is_multicast_ether_addr(hdr->addr1)) {
951 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 952 control->flags |= IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 953 } else {
954 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 955 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
badffb72 956 }
58d4185e
JB		 957
958 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
959 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
960 skb->len + FCS_LEN > local->fragmentation_threshold &&
961 !local->ops->set_frag_threshold)
962 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
963 else
964 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
965 }
966
e2ebc74d
JB		 967 if (!tx->sta)
968 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
969 else if (tx->sta->clear_dst_mask) {
970 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
971 tx->sta->clear_dst_mask = 0;
972 }
58d4185e 973
e2ebc74d
JB		 974 hdrlen = ieee80211_get_hdrlen(tx->fc);
975 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
976 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
977 tx->ethertype = (pos[0] << 8) | pos[1];
978 }
979 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
980
981 return res;
982}
983
984/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
58d4185e
JB		 985 * finished with it.
986 *
987 * NB: @tx is uninitialised when passed in here
988 */
989static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
990 struct sk_buff *skb,
991 struct net_device *mdev,
992 struct ieee80211_tx_control *control)
e2ebc74d
JB		 993{
994 struct ieee80211_tx_packet_data *pkt_data;
995 struct net_device *dev;
996
997 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
881d966b 998 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 999 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1000 dev_put(dev);
1001 dev = NULL;
1002 }
1003 if (unlikely(!dev))
1004 return -ENODEV;
58d4185e 1005 /* initialises tx with control */
e2ebc74d
JB		 1006 __ieee80211_tx_prepare(tx, skb, dev, control);
1007 return 0;
1008}
1009
1010static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1011 struct ieee80211_txrx_data *tx)
1012{
1013 struct ieee80211_tx_control *control = tx->u.tx.control;
1014 int ret, i;
1015
1016 if (!ieee80211_qdisc_installed(local->mdev) &&
1017 __ieee80211_queue_stopped(local, 0)) {
1018 netif_stop_queue(local->mdev);
1019 return IEEE80211_TX_AGAIN;
1020 }
1021 if (skb) {
dd1cd4c6
JB		 1022 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1023 "TX to low-level driver", skb);
e2ebc74d
JB		 1024 ret = local->ops->tx(local_to_hw(local), skb, control);
1025 if (ret)
1026 return IEEE80211_TX_AGAIN;
1027 local->mdev->trans_start = jiffies;
1028 ieee80211_led_tx(local, 1);
1029 }
1030 if (tx->u.tx.extra_frag) {
1031 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1032 IEEE80211_TXCTL_USE_CTS_PROTECT |
1033 IEEE80211_TXCTL_CLEAR_DST_MASK |
1034 IEEE80211_TXCTL_FIRST_FRAGMENT);
1035 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1036 if (!tx->u.tx.extra_frag[i])
1037 continue;
1038 if (__ieee80211_queue_stopped(local, control->queue))
1039 return IEEE80211_TX_FRAG_AGAIN;
1040 if (i == tx->u.tx.num_extra_frag) {
1041 control->tx_rate = tx->u.tx.last_frag_hwrate;
1042 control->rate = tx->u.tx.last_frag_rate;
badffb72 1043 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
e2ebc74d
JB		 1044 control->flags |=
1045 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1046 else
1047 control->flags &=
1048 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1049 }
1050
dd1cd4c6 1051 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
e2ebc74d
JB		 1052 "TX to low-level driver",
1053 tx->u.tx.extra_frag[i]);
1054 ret = local->ops->tx(local_to_hw(local),
1055 tx->u.tx.extra_frag[i],
1056 control);
1057 if (ret)
1058 return IEEE80211_TX_FRAG_AGAIN;
1059 local->mdev->trans_start = jiffies;
1060 ieee80211_led_tx(local, 1);
1061 tx->u.tx.extra_frag[i] = NULL;
1062 }
1063 kfree(tx->u.tx.extra_frag);
1064 tx->u.tx.extra_frag = NULL;
1065 }
1066 return IEEE80211_TX_OK;
1067}
1068
1069static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
f9d540ee 1070 struct ieee80211_tx_control *control)
e2ebc74d
JB		 1071{
1072 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1073 struct sta_info *sta;
1074 ieee80211_tx_handler *handler;
1075 struct ieee80211_txrx_data tx;
1076 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1077 int ret, i;
1078
1079 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1080
1081 if (unlikely(skb->len < 10)) {
1082 dev_kfree_skb(skb);
1083 return 0;
1084 }
1085
58d4185e 1086 /* initialises tx */
e2ebc74d
JB		 1087 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1088
1089 if (res_prepare == TXRX_DROP) {
1090 dev_kfree_skb(skb);
1091 return 0;
1092 }
1093
d4e46a3d
JB		 1094 /*
1095 * key references are protected using RCU and this requires that
1096 * we are in a read-site RCU section during receive processing
1097 */
1098 rcu_read_lock();
1099
e2ebc74d 1100 sta = tx.sta;
e2ebc74d
JB		 1101 tx.u.tx.mode = local->hw.conf.mode;
1102
58d4185e
JB		 1103 for (handler = local->tx_handlers; *handler != NULL;
1104 handler++) {
1105 res = (*handler)(&tx);
1106 if (res != TXRX_CONTINUE)
1107 break;
e2ebc74d
JB		 1108 }
1109
1110 skb = tx.skb; /* handlers are allowed to change skb */
1111
1112 if (sta)
1113 sta_info_put(sta);
1114
1115 if (unlikely(res == TXRX_DROP)) {
1116 I802_DEBUG_INC(local->tx_handlers_drop);
1117 goto drop;
1118 }
1119
1120 if (unlikely(res == TXRX_QUEUED)) {
1121 I802_DEBUG_INC(local->tx_handlers_queued);
d4e46a3d 1122 rcu_read_unlock();
e2ebc74d
JB		 1123 return 0;
1124 }
1125
1126 if (tx.u.tx.extra_frag) {
1127 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1128 int next_len, dur;
1129 struct ieee80211_hdr *hdr =
1130 (struct ieee80211_hdr *)
1131 tx.u.tx.extra_frag[i]->data;
1132
1133 if (i + 1 < tx.u.tx.num_extra_frag) {
1134 next_len = tx.u.tx.extra_frag[i + 1]->len;
1135 } else {
1136 next_len = 0;
1137 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1138 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1139 }
1140 dur = ieee80211_duration(&tx, 0, next_len);
1141 hdr->duration_id = cpu_to_le16(dur);
1142 }
1143 }
1144
1145retry:
1146 ret = __ieee80211_tx(local, skb, &tx);
1147 if (ret) {
1148 struct ieee80211_tx_stored_packet *store =
1149 &local->pending_packet[control->queue];
1150
1151 if (ret == IEEE80211_TX_FRAG_AGAIN)
1152 skb = NULL;
1153 set_bit(IEEE80211_LINK_STATE_PENDING,
1154 &local->state[control->queue]);
1155 smp_mb();
1156 /* When the driver gets out of buffers during sending of
1157 * fragments and calls ieee80211_stop_queue, there is
1158 * a small window between IEEE80211_LINK_STATE_XOFF and
1159 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1160 * gets available in that window (i.e. driver calls
1161 * ieee80211_wake_queue), we would end up with ieee80211_tx
1162 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1163 * continuing transmitting here when that situation is
1164 * possible to have happened. */
1165 if (!__ieee80211_queue_stopped(local, control->queue)) {
1166 clear_bit(IEEE80211_LINK_STATE_PENDING,
1167 &local->state[control->queue]);
1168 goto retry;
1169 }
1170 memcpy(&store->control, control,
1171 sizeof(struct ieee80211_tx_control));
1172 store->skb = skb;
1173 store->extra_frag = tx.u.tx.extra_frag;
1174 store->num_extra_frag = tx.u.tx.num_extra_frag;
1175 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1176 store->last_frag_rate = tx.u.tx.last_frag_rate;
badffb72
JS		 1177 store->last_frag_rate_ctrl_probe =
1178 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
e2ebc74d 1179 }
d4e46a3d 1180 rcu_read_unlock();
e2ebc74d
JB		 1181 return 0;
1182
1183 drop:
1184 if (skb)
1185 dev_kfree_skb(skb);
1186 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1187 if (tx.u.tx.extra_frag[i])
1188 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1189 kfree(tx.u.tx.extra_frag);
d4e46a3d 1190 rcu_read_unlock();
e2ebc74d
JB		 1191 return 0;
1192}
1193
1194/* device xmit handlers */
1195
1196int ieee80211_master_start_xmit(struct sk_buff *skb,
1197 struct net_device *dev)
1198{
1199 struct ieee80211_tx_control control;
1200 struct ieee80211_tx_packet_data *pkt_data;
1201 struct net_device *odev = NULL;
1202 struct ieee80211_sub_if_data *osdata;
1203 int headroom;
1204 int ret;
1205
1206 /*
1207 * copy control out of the skb so other people can use skb->cb
1208 */
1209 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1210 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1211
1212 if (pkt_data->ifindex)
881d966b 1213 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 1214 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1215 dev_put(odev);
1216 odev = NULL;
1217 }
1218 if (unlikely(!odev)) {
1219#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1220 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1221 "originating device\n", dev->name);
1222#endif
1223 dev_kfree_skb(skb);
1224 return 0;
1225 }
1226 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1227
1228 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1229 if (skb_headroom(skb) < headroom) {
1230 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1231 dev_kfree_skb(skb);
1232 dev_put(odev);
1233 return 0;
1234 }
1235 }
1236
1237 control.ifindex = odev->ifindex;
1238 control.type = osdata->type;
e8bf9649 1239 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
e2ebc74d 1240 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
e8bf9649 1241 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
e2ebc74d 1242 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
e8bf9649 1243 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
e2ebc74d 1244 control.flags |= IEEE80211_TXCTL_REQUEUE;
678f5f71
JB		 1245 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
1246 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
e2ebc74d
JB		 1247 control.queue = pkt_data->queue;
1248
f9d540ee 1249 ret = ieee80211_tx(odev, skb, &control);
e2ebc74d
JB		 1250 dev_put(odev);
1251
1252 return ret;
1253}
1254
1255int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1256 struct net_device *dev)
1257{
1258 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1259 struct ieee80211_tx_packet_data *pkt_data;
1260 struct ieee80211_radiotap_header *prthdr =
1261 (struct ieee80211_radiotap_header *)skb->data;
9b8a74e3 1262 u16 len_rthdr;
e2ebc74d 1263
9b8a74e3
AG		 1264 /* check for not even having the fixed radiotap header part */
1265 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1266 goto fail; /* too short to be possibly valid */
1267
1268 /* is it a header version we can trust to find length from? */
1269 if (unlikely(prthdr->it_version))
1270 goto fail; /* only version 0 is supported */
1271
1272 /* then there must be a radiotap header with a length we can use */
1273 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1274
1275 /* does the skb contain enough to deliver on the alleged length? */
1276 if (unlikely(skb->len < len_rthdr))
1277 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d
JB		 1278
1279 skb->dev = local->mdev;
1280
1281 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1282 memset(pkt_data, 0, sizeof(*pkt_data));
9b8a74e3 1283 /* needed because we set skb device to master */
e2ebc74d 1284 pkt_data->ifindex = dev->ifindex;
9b8a74e3 1285
e8bf9649 1286 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d 1287
e2ebc74d
JB		 1288 /*
1289 * fix up the pointers accounting for the radiotap
1290 * header still being in there. We are being given
1291 * a precooked IEEE80211 header so no need for
1292 * normal processing
1293 */
9b8a74e3 1294 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1295 /*
9b8a74e3
AG		 1296 * these are just fixed to the end of the rt area since we
1297 * don't have any better information and at this point, nobody cares
e2ebc74d 1298 */
9b8a74e3
AG		 1299 skb_set_network_header(skb, len_rthdr);
1300 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1301
9b8a74e3
AG		 1302 /* pass the radiotap header up to the next stage intact */
1303 dev_queue_xmit(skb);
e2ebc74d 1304 return NETDEV_TX_OK;
9b8a74e3
AG		 1305
1306fail:
1307 dev_kfree_skb(skb);
1308 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1309}
1310
1311/**
1312 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1313 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1314 * @skb: packet to be sent
1315 * @dev: incoming interface
1316 *
1317 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1318 * not be freed, and caller is responsible for either retrying later or freeing
1319 * skb).
1320 *
1321 * This function takes in an Ethernet header and encapsulates it with suitable
1322 * IEEE 802.11 header based on which interface the packet is coming in. The
1323 * encapsulated packet will then be passed to master interface, wlan#.11, for
1324 * transmission (through low-level driver).
1325 */
1326int ieee80211_subif_start_xmit(struct sk_buff *skb,
1327 struct net_device *dev)
1328{
1329 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1330 struct ieee80211_tx_packet_data *pkt_data;
1331 struct ieee80211_sub_if_data *sdata;
1332 int ret = 1, head_need;
1333 u16 ethertype, hdrlen, fc;
1334 struct ieee80211_hdr hdr;
1335 const u8 *encaps_data;
1336 int encaps_len, skip_header_bytes;
e8bf9649 1337 int nh_pos, h_pos;
e2ebc74d 1338 struct sta_info *sta;
ce3edf6d 1339 u32 sta_flags = 0;
e2ebc74d
JB		 1340
1341 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1342 if (unlikely(skb->len < ETH_HLEN)) {
1343 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1344 dev->name, skb->len);
1345 ret = 0;
1346 goto fail;
1347 }
1348
1349 nh_pos = skb_network_header(skb) - skb->data;
1350 h_pos = skb_transport_header(skb) - skb->data;
1351
1352 /* convert Ethernet header to proper 802.11 header (based on
1353 * operation mode) */
1354 ethertype = (skb->data[12] << 8) | skb->data[13];
e2ebc74d
JB		 1355 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1356
cf966838
JB		 1357 switch (sdata->type) {
1358 case IEEE80211_IF_TYPE_AP:
1359 case IEEE80211_IF_TYPE_VLAN:
e2ebc74d
JB		 1360 fc |= IEEE80211_FCTL_FROMDS;
1361 /* DA BSSID SA */
1362 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1363 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1364 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1365 hdrlen = 24;
cf966838
JB		 1366 break;
1367 case IEEE80211_IF_TYPE_WDS:
e2ebc74d
JB		 1368 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1369 /* RA TA DA SA */
1370 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1371 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1372 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1373 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1374 hdrlen = 30;
cf966838
JB		 1375 break;
1376 case IEEE80211_IF_TYPE_STA:
e2ebc74d
JB		 1377 fc |= IEEE80211_FCTL_TODS;
1378 /* BSSID SA DA */
1379 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1380 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1381 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1382 hdrlen = 24;
cf966838
JB		 1383 break;
1384 case IEEE80211_IF_TYPE_IBSS:
e2ebc74d
JB		 1385 /* DA SA BSSID */
1386 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1387 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1388 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1389 hdrlen = 24;
cf966838
JB		 1390 break;
1391 default:
e2ebc74d
JB		 1392 ret = 0;
1393 goto fail;
1394 }
1395
e2ebc74d
JB		 1396 sta = sta_info_get(local, hdr.addr1);
1397 if (sta) {
ce3edf6d 1398 sta_flags = sta->flags;
e2ebc74d
JB		 1399 sta_info_put(sta);
1400 }
1401
ce3edf6d
JB		 1402 /* receiver is QoS enabled, use a QoS type frame */
1403 if (sta_flags & WLAN_STA_WME) {
1404 fc |= IEEE80211_STYPE_QOS_DATA;
1405 hdrlen += 2;
1406 }
1407
1408 /*
1409 * If port access control is enabled, drop frames to unauthorised
1410 * stations unless they are EAPOL frames from the local station.
1411 */
1412 if (unlikely(sdata->ieee802_1x_pac &&
1413 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1414 !(ethertype == ETH_P_PAE &&
1415 compare_ether_addr(dev->dev_addr,
1416 skb->data + ETH_ALEN) == 0))) {
1417#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1418 DECLARE_MAC_BUF(mac);
1419
1420 if (net_ratelimit())
1421 printk(KERN_DEBUG "%s: dropped frame to %s"
1422 " (unauthorized port)\n", dev->name,
1423 print_mac(mac, hdr.addr1));
1424#endif
1425
1426 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1427
1428 ret = 0;
1429 goto fail;
1430 }
1431
e2ebc74d
JB		 1432 hdr.frame_control = cpu_to_le16(fc);
1433 hdr.duration_id = 0;
1434 hdr.seq_ctrl = 0;
1435
1436 skip_header_bytes = ETH_HLEN;
1437 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1438 encaps_data = bridge_tunnel_header;
1439 encaps_len = sizeof(bridge_tunnel_header);
1440 skip_header_bytes -= 2;
1441 } else if (ethertype >= 0x600) {
1442 encaps_data = rfc1042_header;
1443 encaps_len = sizeof(rfc1042_header);
1444 skip_header_bytes -= 2;
1445 } else {
1446 encaps_data = NULL;
1447 encaps_len = 0;
1448 }
1449
1450 skb_pull(skb, skip_header_bytes);
1451 nh_pos -= skip_header_bytes;
1452 h_pos -= skip_header_bytes;
1453
1454 /* TODO: implement support for fragments so that there is no need to
1455 * reallocate and copy payload; it might be enough to support one
1456 * extra fragment that would be copied in the beginning of the frame
1457 * data.. anyway, it would be nice to include this into skb structure
1458 * somehow
1459 *
1460 * There are few options for this:
1461 * use skb->cb as an extra space for 802.11 header
1462 * allocate new buffer if not enough headroom
1463 * make sure that there is enough headroom in every skb by increasing
1464 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1465 * alloc_skb() (net/core/skbuff.c)
1466 */
1467 head_need = hdrlen + encaps_len + local->tx_headroom;
1468 head_need -= skb_headroom(skb);
1469
1470 /* We are going to modify skb data, so make a copy of it if happens to
1471 * be cloned. This could happen, e.g., with Linux bridge code passing
1472 * us broadcast frames. */
1473
1474 if (head_need > 0 || skb_cloned(skb)) {
1475#if 0
1476 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1477 "of headroom\n", dev->name, head_need);
1478#endif
1479
1480 if (skb_cloned(skb))
1481 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1482 else
1483 I802_DEBUG_INC(local->tx_expand_skb_head);
1484 /* Since we have to reallocate the buffer, make sure that there
1485 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1486 * before payload and 12 after). */
1487 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1488 12, GFP_ATOMIC)) {
1489 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1490 "\n", dev->name);
1491 goto fail;
1492 }
1493 }
1494
1495 if (encaps_data) {
1496 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1497 nh_pos += encaps_len;
1498 h_pos += encaps_len;
1499 }
c29b9b9b
JB		 1500
1501 if (fc & IEEE80211_STYPE_QOS_DATA) {
1502 __le16 *qos_control;
1503
1504 qos_control = (__le16*) skb_push(skb, 2);
1505 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1506 /*
1507 * Maybe we could actually set some fields here, for now just
1508 * initialise to zero to indicate no special operation.
1509 */
1510 *qos_control = 0;
1511 } else
1512 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1513
e2ebc74d
JB		 1514 nh_pos += hdrlen;
1515 h_pos += hdrlen;
1516
1517 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1518 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1519 pkt_data->ifindex = dev->ifindex;
678f5f71
JB		 1520 if (ethertype == ETH_P_PAE)
1521 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
e2ebc74d
JB		 1522
1523 skb->dev = local->mdev;
68aae116
SH		 1524 dev->stats.tx_packets++;
1525 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 1526
1527 /* Update skb pointers to various headers since this modified frame
1528 * is going to go through Linux networking code that may potentially
1529 * need things like pointer to IP header. */
1530 skb_set_mac_header(skb, 0);
1531 skb_set_network_header(skb, nh_pos);
1532 skb_set_transport_header(skb, h_pos);
1533
1534 dev->trans_start = jiffies;
1535 dev_queue_xmit(skb);
1536
1537 return 0;
1538
1539 fail:
1540 if (!ret)
1541 dev_kfree_skb(skb);
1542
1543 return ret;
1544}
1545
e2ebc74d
JB		 1546/* helper functions for pending packets for when queues are stopped */
1547
1548void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1549{
1550 int i, j;
1551 struct ieee80211_tx_stored_packet *store;
1552
1553 for (i = 0; i < local->hw.queues; i++) {
1554 if (!__ieee80211_queue_pending(local, i))
1555 continue;
1556 store = &local->pending_packet[i];
1557 kfree_skb(store->skb);
1558 for (j = 0; j < store->num_extra_frag; j++)
1559 kfree_skb(store->extra_frag[j]);
1560 kfree(store->extra_frag);
1561 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1562 }
1563}
1564
1565void ieee80211_tx_pending(unsigned long data)
1566{
1567 struct ieee80211_local *local = (struct ieee80211_local *)data;
1568 struct net_device *dev = local->mdev;
1569 struct ieee80211_tx_stored_packet *store;
1570 struct ieee80211_txrx_data tx;
1571 int i, ret, reschedule = 0;
1572
1573 netif_tx_lock_bh(dev);
1574 for (i = 0; i < local->hw.queues; i++) {
1575 if (__ieee80211_queue_stopped(local, i))
1576 continue;
1577 if (!__ieee80211_queue_pending(local, i)) {
1578 reschedule = 1;
1579 continue;
1580 }
1581 store = &local->pending_packet[i];
1582 tx.u.tx.control = &store->control;
1583 tx.u.tx.extra_frag = store->extra_frag;
1584 tx.u.tx.num_extra_frag = store->num_extra_frag;
1585 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1586 tx.u.tx.last_frag_rate = store->last_frag_rate;
badffb72
JS		 1587 tx.flags = 0;
1588 if (store->last_frag_rate_ctrl_probe)
1589 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 1590 ret = __ieee80211_tx(local, store->skb, &tx);
1591 if (ret) {
1592 if (ret == IEEE80211_TX_FRAG_AGAIN)
1593 store->skb = NULL;
1594 } else {
1595 clear_bit(IEEE80211_LINK_STATE_PENDING,
1596 &local->state[i]);
1597 reschedule = 1;
1598 }
1599 }
1600 netif_tx_unlock_bh(dev);
1601 if (reschedule) {
1602 if (!ieee80211_qdisc_installed(dev)) {
1603 if (!__ieee80211_queue_stopped(local, 0))
1604 netif_wake_queue(dev);
1605 } else
1606 netif_schedule(dev);
1607 }
1608}
1609
1610/* functions for drivers to get certain frames */
1611
1612static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1613 struct ieee80211_if_ap *bss,
1614 struct sk_buff *skb)
1615{
1616 u8 *pos, *tim;
1617 int aid0 = 0;
1618 int i, have_bits = 0, n1, n2;
1619
1620 /* Generate bitmap for TIM only if there are any STAs in power save
1621 * mode. */
be8755e1 1622 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 1623 if (atomic_read(&bss->num_sta_ps) > 0)
1624 /* in the hope that this is faster than
1625 * checking byte-for-byte */
1626 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1627 IEEE80211_MAX_AID+1);
1628
1629 if (bss->dtim_count == 0)
1630 bss->dtim_count = bss->dtim_period - 1;
1631 else
1632 bss->dtim_count--;
1633
1634 tim = pos = (u8 *) skb_put(skb, 6);
1635 *pos++ = WLAN_EID_TIM;
1636 *pos++ = 4;
1637 *pos++ = bss->dtim_count;
1638 *pos++ = bss->dtim_period;
1639
1640 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1641 aid0 = 1;
1642
1643 if (have_bits) {
1644 /* Find largest even number N1 so that bits numbered 1 through
1645 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1646 * (N2 + 1) x 8 through 2007 are 0. */
1647 n1 = 0;
1648 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1649 if (bss->tim[i]) {
1650 n1 = i & 0xfe;
1651 break;
1652 }
1653 }
1654 n2 = n1;
1655 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1656 if (bss->tim[i]) {
1657 n2 = i;
1658 break;
1659 }
1660 }
1661
1662 /* Bitmap control */
1663 *pos++ = n1 | aid0;
1664 /* Part Virt Bitmap */
1665 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1666
1667 tim[1] = n2 - n1 + 4;
1668 skb_put(skb, n2 - n1);
1669 } else {
1670 *pos++ = aid0; /* Bitmap control */
1671 *pos++ = 0; /* Part Virt Bitmap */
1672 }
be8755e1 1673 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 1674}
1675
1676struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1677 struct ieee80211_tx_control *control)
1678{
1679 struct ieee80211_local *local = hw_to_local(hw);
1680 struct sk_buff *skb;
1681 struct net_device *bdev;
1682 struct ieee80211_sub_if_data *sdata = NULL;
1683 struct ieee80211_if_ap *ap = NULL;
1abbe498 1684 struct rate_selection rsel;
e2ebc74d
JB		 1685 u8 *b_head, *b_tail;
1686 int bh_len, bt_len;
1687
881d966b 1688 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1689 if (bdev) {
1690 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1691 ap = &sdata->u.ap;
1692 dev_put(bdev);
1693 }
1694
1695 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1696 !ap->beacon_head) {
1697#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1698 if (net_ratelimit())
1699 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1700 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1701#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1702 return NULL;
1703 }
1704
1705 /* Assume we are generating the normal beacon locally */
1706 b_head = ap->beacon_head;
1707 b_tail = ap->beacon_tail;
1708 bh_len = ap->beacon_head_len;
1709 bt_len = ap->beacon_tail_len;
1710
1711 skb = dev_alloc_skb(local->tx_headroom +
1712 bh_len + bt_len + 256 /* maximum TIM len */);
1713 if (!skb)
1714 return NULL;
1715
1716 skb_reserve(skb, local->tx_headroom);
1717 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1718
1719 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1720
1721 ieee80211_beacon_add_tim(local, ap, skb);
1722
1723 if (b_tail) {
1724 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1725 }
1726
1727 if (control) {
1abbe498
MN		 1728 rate_control_get_rate(local->mdev, local->oper_hw_mode, skb,
1729 &rsel);
1730 if (!rsel.rate) {
e2ebc74d 1731 if (net_ratelimit()) {
1abbe498
MN		 1732 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1733 "no rate found\n",
1734 wiphy_name(local->hw.wiphy));
e2ebc74d
JB		 1735 }
1736 dev_kfree_skb(skb);
1737 return NULL;
1738 }
1739
13262ffd
JS		 1740 control->tx_rate =
1741 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1abbe498
MN		 1742 (rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1743 rsel.rate->val2 : rsel.rate->val;
e2ebc74d
JB		 1744 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1745 control->power_level = local->hw.conf.power_level;
1746 control->flags |= IEEE80211_TXCTL_NO_ACK;
1747 control->retry_limit = 1;
1748 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1749 }
1750
1751 ap->num_beacons++;
1752 return skb;
1753}
1754EXPORT_SYMBOL(ieee80211_beacon_get);
1755
7e9ed188 1756void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1757 const void *frame, size_t frame_len,
1758 const struct ieee80211_tx_control *frame_txctl,
1759 struct ieee80211_rts *rts)
1760{
1761 const struct ieee80211_hdr *hdr = frame;
1762 u16 fctl;
1763
1764 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1765 rts->frame_control = cpu_to_le16(fctl);
7e9ed188 1766 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1767 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1768 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1769}
1770EXPORT_SYMBOL(ieee80211_rts_get);
1771
7e9ed188 1772void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1773 const void *frame, size_t frame_len,
1774 const struct ieee80211_tx_control *frame_txctl,
1775 struct ieee80211_cts *cts)
1776{
1777 const struct ieee80211_hdr *hdr = frame;
1778 u16 fctl;
1779
1780 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1781 cts->frame_control = cpu_to_le16(fctl);
7e9ed188 1782 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1783 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1784}
1785EXPORT_SYMBOL(ieee80211_ctstoself_get);
1786
1787struct sk_buff *
1788ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1789 struct ieee80211_tx_control *control)
1790{
1791 struct ieee80211_local *local = hw_to_local(hw);
1792 struct sk_buff *skb;
1793 struct sta_info *sta;
1794 ieee80211_tx_handler *handler;
1795 struct ieee80211_txrx_data tx;
1796 ieee80211_txrx_result res = TXRX_DROP;
1797 struct net_device *bdev;
1798 struct ieee80211_sub_if_data *sdata;
1799 struct ieee80211_if_ap *bss = NULL;
1800
881d966b 1801 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1802 if (bdev) {
1803 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1804 bss = &sdata->u.ap;
1805 dev_put(bdev);
1806 }
1807 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1808 return NULL;
1809
1810 if (bss->dtim_count != 0)
1811 return NULL; /* send buffered bc/mc only after DTIM beacon */
1812 memset(control, 0, sizeof(*control));
1813 while (1) {
1814 skb = skb_dequeue(&bss->ps_bc_buf);
1815 if (!skb)
1816 return NULL;
1817 local->total_ps_buffered--;
1818
1819 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1820 struct ieee80211_hdr *hdr =
1821 (struct ieee80211_hdr *) skb->data;
1822 /* more buffered multicast/broadcast frames ==> set
1823 * MoreData flag in IEEE 802.11 header to inform PS
1824 * STAs */
1825 hdr->frame_control |=
1826 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1827 }
1828
58d4185e 1829 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
e2ebc74d
JB		 1830 break;
1831 dev_kfree_skb_any(skb);
1832 }
1833 sta = tx.sta;
badffb72 1834 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
475fa49c 1835 tx.u.tx.mode = local->hw.conf.mode;
e2ebc74d
JB		 1836
1837 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1838 res = (*handler)(&tx);
1839 if (res == TXRX_DROP || res == TXRX_QUEUED)
1840 break;
1841 }
1842 dev_put(tx.dev);
1843 skb = tx.skb; /* handlers are allowed to change skb */
1844
1845 if (res == TXRX_DROP) {
1846 I802_DEBUG_INC(local->tx_handlers_drop);
1847 dev_kfree_skb(skb);
1848 skb = NULL;
1849 } else if (res == TXRX_QUEUED) {
1850 I802_DEBUG_INC(local->tx_handlers_queued);
1851 skb = NULL;
1852 }
1853
1854 if (sta)
1855 sta_info_put(sta);
1856
1857 return skb;
1858}
1859EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux 6.x block layer and io_uring tree(s)