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mac80211: clean up mesh code
[deliverable/linux.git] / net / mac80211 / tx.c
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>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
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 "mesh.h"
30 #include "wep.h"
31 #include "wpa.h"
32 #include "wme.h"
33 #include "ieee80211_rate.h"
34
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
38
39 /* misc utils */
40
41 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
42 struct ieee80211_hdr *hdr)
43 {
44 /* Set the sequence number for this frame. */
45 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
46
47 /* Increase the sequence number. */
48 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
49 }
50
51 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
52 static void ieee80211_dump_frame(const char *ifname, const char *title,
53 const struct sk_buff *skb)
54 {
55 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
56 u16 fc;
57 int hdrlen;
58 DECLARE_MAC_BUF(mac);
59
60 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
61 if (skb->len < 4) {
62 printk("\n");
63 return;
64 }
65
66 fc = le16_to_cpu(hdr->frame_control);
67 hdrlen = ieee80211_get_hdrlen(fc);
68 if (hdrlen > skb->len)
69 hdrlen = skb->len;
70 if (hdrlen >= 4)
71 printk(" FC=0x%04x DUR=0x%04x",
72 fc, le16_to_cpu(hdr->duration_id));
73 if (hdrlen >= 10)
74 printk(" A1=%s", print_mac(mac, hdr->addr1));
75 if (hdrlen >= 16)
76 printk(" A2=%s", print_mac(mac, hdr->addr2));
77 if (hdrlen >= 24)
78 printk(" A3=%s", print_mac(mac, hdr->addr3));
79 if (hdrlen >= 30)
80 printk(" A4=%s", print_mac(mac, hdr->addr4));
81 printk("\n");
82 }
83 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
84 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
85 struct sk_buff *skb)
86 {
87 }
88 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
89
90 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
91 int next_frag_len)
92 {
93 int rate, mrate, erp, dur, i;
94 struct ieee80211_rate *txrate = tx->u.tx.rate;
95 struct ieee80211_local *local = tx->local;
96 struct ieee80211_supported_band *sband;
97
98 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
99
100 erp = 0;
101 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
102 erp = txrate->flags & IEEE80211_RATE_ERP_G;
103
104 /*
105 * data and mgmt (except PS Poll):
106 * - during CFP: 32768
107 * - during contention period:
108 * if addr1 is group address: 0
109 * if more fragments = 0 and addr1 is individual address: time to
110 * transmit one ACK plus SIFS
111 * if more fragments = 1 and addr1 is individual address: time to
112 * transmit next fragment plus 2 x ACK plus 3 x SIFS
113 *
114 * IEEE 802.11, 9.6:
115 * - control response frame (CTS or ACK) shall be transmitted using the
116 * same rate as the immediately previous frame in the frame exchange
117 * sequence, if this rate belongs to the PHY mandatory rates, or else
118 * at the highest possible rate belonging to the PHY rates in the
119 * BSSBasicRateSet
120 */
121
122 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
123 /* TODO: These control frames are not currently sent by
124 * 80211.o, but should they be implemented, this function
125 * needs to be updated to support duration field calculation.
126 *
127 * RTS: time needed to transmit pending data/mgmt frame plus
128 * one CTS frame plus one ACK frame plus 3 x SIFS
129 * CTS: duration of immediately previous RTS minus time
130 * required to transmit CTS and its SIFS
131 * ACK: 0 if immediately previous directed data/mgmt had
132 * more=0, with more=1 duration in ACK frame is duration
133 * from previous frame minus time needed to transmit ACK
134 * and its SIFS
135 * PS Poll: BIT(15) | BIT(14) | aid
136 */
137 return 0;
138 }
139
140 /* data/mgmt */
141 if (0 /* FIX: data/mgmt during CFP */)
142 return 32768;
143
144 if (group_addr) /* Group address as the destination - no ACK */
145 return 0;
146
147 /* Individual destination address:
148 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
149 * CTS and ACK frames shall be transmitted using the highest rate in
150 * basic rate set that is less than or equal to the rate of the
151 * immediately previous frame and that is using the same modulation
152 * (CCK or OFDM). If no basic rate set matches with these requirements,
153 * the highest mandatory rate of the PHY that is less than or equal to
154 * the rate of the previous frame is used.
155 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
156 */
157 rate = -1;
158 /* use lowest available if everything fails */
159 mrate = sband->bitrates[0].bitrate;
160 for (i = 0; i < sband->n_bitrates; i++) {
161 struct ieee80211_rate *r = &sband->bitrates[i];
162
163 if (r->bitrate > txrate->bitrate)
164 break;
165
166 if (tx->sdata->basic_rates & BIT(i))
167 rate = r->bitrate;
168
169 switch (sband->band) {
170 case IEEE80211_BAND_2GHZ: {
171 u32 flag;
172 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
173 flag = IEEE80211_RATE_MANDATORY_G;
174 else
175 flag = IEEE80211_RATE_MANDATORY_B;
176 if (r->flags & flag)
177 mrate = r->bitrate;
178 break;
179 }
180 case IEEE80211_BAND_5GHZ:
181 if (r->flags & IEEE80211_RATE_MANDATORY_A)
182 mrate = r->bitrate;
183 break;
184 case IEEE80211_NUM_BANDS:
185 WARN_ON(1);
186 break;
187 }
188 }
189 if (rate == -1) {
190 /* No matching basic rate found; use highest suitable mandatory
191 * PHY rate */
192 rate = mrate;
193 }
194
195 /* Time needed to transmit ACK
196 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
197 * to closest integer */
198
199 dur = ieee80211_frame_duration(local, 10, rate, erp,
200 tx->sdata->bss_conf.use_short_preamble);
201
202 if (next_frag_len) {
203 /* Frame is fragmented: duration increases with time needed to
204 * transmit next fragment plus ACK and 2 x SIFS. */
205 dur *= 2; /* ACK + SIFS */
206 /* next fragment */
207 dur += ieee80211_frame_duration(local, next_frag_len,
208 txrate->bitrate, erp,
209 tx->sdata->bss_conf.use_short_preamble);
210 }
211
212 return dur;
213 }
214
215 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
216 int queue)
217 {
218 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
219 }
220
221 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
222 int queue)
223 {
224 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
225 }
226
227 static int inline is_ieee80211_device(struct net_device *dev,
228 struct net_device *master)
229 {
230 return (wdev_priv(dev->ieee80211_ptr) ==
231 wdev_priv(master->ieee80211_ptr));
232 }
233
234 /* tx handlers */
235
236 static ieee80211_tx_result
237 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
238 {
239 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
240 struct sk_buff *skb = tx->skb;
241 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
242 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
243 u32 sta_flags;
244
245 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
246 return TX_CONTINUE;
247
248 if (unlikely(tx->local->sta_sw_scanning) &&
249 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
250 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
251 return TX_DROP;
252
253 if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT)
254 return TX_CONTINUE;
255
256 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
257 return TX_CONTINUE;
258
259 sta_flags = tx->sta ? tx->sta->flags : 0;
260
261 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
262 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
263 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
264 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
265 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
266 DECLARE_MAC_BUF(mac);
267 printk(KERN_DEBUG "%s: dropped data frame to not "
268 "associated station %s\n",
269 tx->dev->name, print_mac(mac, hdr->addr1));
270 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
271 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
272 return TX_DROP;
273 }
274 } else {
275 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
276 tx->local->num_sta == 0 &&
277 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
278 /*
279 * No associated STAs - no need to send multicast
280 * frames.
281 */
282 return TX_DROP;
283 }
284 return TX_CONTINUE;
285 }
286
287 return TX_CONTINUE;
288 }
289
290 static ieee80211_tx_result
291 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
292 {
293 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
294
295 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
296 ieee80211_include_sequence(tx->sdata, hdr);
297
298 return TX_CONTINUE;
299 }
300
301 /* This function is called whenever the AP is about to exceed the maximum limit
302 * of buffered frames for power saving STAs. This situation should not really
303 * happen often during normal operation, so dropping the oldest buffered packet
304 * from each queue should be OK to make some room for new frames. */
305 static void purge_old_ps_buffers(struct ieee80211_local *local)
306 {
307 int total = 0, purged = 0;
308 struct sk_buff *skb;
309 struct ieee80211_sub_if_data *sdata;
310 struct sta_info *sta;
311
312 /*
313 * virtual interfaces are protected by RCU
314 */
315 rcu_read_lock();
316
317 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
318 struct ieee80211_if_ap *ap;
319 if (sdata->dev == local->mdev ||
320 sdata->vif.type != IEEE80211_IF_TYPE_AP)
321 continue;
322 ap = &sdata->u.ap;
323 skb = skb_dequeue(&ap->ps_bc_buf);
324 if (skb) {
325 purged++;
326 dev_kfree_skb(skb);
327 }
328 total += skb_queue_len(&ap->ps_bc_buf);
329 }
330 rcu_read_unlock();
331
332 read_lock_bh(&local->sta_lock);
333 list_for_each_entry(sta, &local->sta_list, list) {
334 skb = skb_dequeue(&sta->ps_tx_buf);
335 if (skb) {
336 purged++;
337 dev_kfree_skb(skb);
338 }
339 total += skb_queue_len(&sta->ps_tx_buf);
340 }
341 read_unlock_bh(&local->sta_lock);
342
343 local->total_ps_buffered = total;
344 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
345 wiphy_name(local->hw.wiphy), purged);
346 }
347
348 static ieee80211_tx_result
349 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
350 {
351 /*
352 * broadcast/multicast frame
353 *
354 * If any of the associated stations is in power save mode,
355 * the frame is buffered to be sent after DTIM beacon frame.
356 * This is done either by the hardware or us.
357 */
358
359 /* not AP/IBSS or ordered frame */
360 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
361 return TX_CONTINUE;
362
363 /* no stations in PS mode */
364 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
365 return TX_CONTINUE;
366
367 /* buffered in mac80211 */
368 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
369 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
370 purge_old_ps_buffers(tx->local);
371 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
372 AP_MAX_BC_BUFFER) {
373 if (net_ratelimit()) {
374 printk(KERN_DEBUG "%s: BC TX buffer full - "
375 "dropping the oldest frame\n",
376 tx->dev->name);
377 }
378 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
379 } else
380 tx->local->total_ps_buffered++;
381 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
382 return TX_QUEUED;
383 }
384
385 /* buffered in hardware */
386 tx->u.tx.control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM;
387
388 return TX_CONTINUE;
389 }
390
391 static ieee80211_tx_result
392 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
393 {
394 struct sta_info *sta = tx->sta;
395 DECLARE_MAC_BUF(mac);
396
397 if (unlikely(!sta ||
398 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
399 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
400 return TX_CONTINUE;
401
402 if (unlikely((sta->flags & WLAN_STA_PS) &&
403 !(sta->flags & WLAN_STA_PSPOLL))) {
404 struct ieee80211_tx_packet_data *pkt_data;
405 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
406 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
407 "before %d)\n",
408 print_mac(mac, sta->addr), sta->aid,
409 skb_queue_len(&sta->ps_tx_buf));
410 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
411 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
412 purge_old_ps_buffers(tx->local);
413 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
414 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
415 if (net_ratelimit()) {
416 printk(KERN_DEBUG "%s: STA %s TX "
417 "buffer full - dropping oldest frame\n",
418 tx->dev->name, print_mac(mac, sta->addr));
419 }
420 dev_kfree_skb(old);
421 } else
422 tx->local->total_ps_buffered++;
423
424 /* Queue frame to be sent after STA sends an PS Poll frame */
425 if (skb_queue_empty(&sta->ps_tx_buf))
426 sta_info_set_tim_bit(sta);
427
428 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
429 pkt_data->jiffies = jiffies;
430 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
431 return TX_QUEUED;
432 }
433 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
434 else if (unlikely(sta->flags & WLAN_STA_PS)) {
435 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
436 "set -> send frame\n", tx->dev->name,
437 print_mac(mac, sta->addr));
438 }
439 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
440 sta->flags &= ~WLAN_STA_PSPOLL;
441
442 return TX_CONTINUE;
443 }
444
445 static ieee80211_tx_result
446 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
447 {
448 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
449 return TX_CONTINUE;
450
451 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
452 return ieee80211_tx_h_unicast_ps_buf(tx);
453 else
454 return ieee80211_tx_h_multicast_ps_buf(tx);
455 }
456
457 static ieee80211_tx_result
458 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
459 {
460 struct ieee80211_key *key;
461 u16 fc = tx->fc;
462
463 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
464 tx->key = NULL;
465 else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
466 tx->key = key;
467 else if ((key = rcu_dereference(tx->sdata->default_key)))
468 tx->key = key;
469 else if (tx->sdata->drop_unencrypted &&
470 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
471 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
472 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
473 return TX_DROP;
474 } else
475 tx->key = NULL;
476
477 if (tx->key) {
478 u16 ftype, stype;
479
480 tx->key->tx_rx_count++;
481 /* TODO: add threshold stuff again */
482
483 switch (tx->key->conf.alg) {
484 case ALG_WEP:
485 ftype = fc & IEEE80211_FCTL_FTYPE;
486 stype = fc & IEEE80211_FCTL_STYPE;
487
488 if (ftype == IEEE80211_FTYPE_MGMT &&
489 stype == IEEE80211_STYPE_AUTH)
490 break;
491 case ALG_TKIP:
492 case ALG_CCMP:
493 if (!WLAN_FC_DATA_PRESENT(fc))
494 tx->key = NULL;
495 break;
496 }
497 }
498
499 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
500 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
501
502 return TX_CONTINUE;
503 }
504
505 static ieee80211_tx_result
506 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
507 {
508 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
509 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
510 struct sk_buff **frags, *first, *frag;
511 int i;
512 u16 seq;
513 u8 *pos;
514 int frag_threshold = tx->local->fragmentation_threshold;
515
516 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
517 return TX_CONTINUE;
518
519 first = tx->skb;
520
521 hdrlen = ieee80211_get_hdrlen(tx->fc);
522 payload_len = first->len - hdrlen;
523 per_fragm = frag_threshold - hdrlen - FCS_LEN;
524 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
525
526 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
527 if (!frags)
528 goto fail;
529
530 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
531 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
532 pos = first->data + hdrlen + per_fragm;
533 left = payload_len - per_fragm;
534 for (i = 0; i < num_fragm - 1; i++) {
535 struct ieee80211_hdr *fhdr;
536 size_t copylen;
537
538 if (left <= 0)
539 goto fail;
540
541 /* reserve enough extra head and tail room for possible
542 * encryption */
543 frag = frags[i] =
544 dev_alloc_skb(tx->local->tx_headroom +
545 frag_threshold +
546 IEEE80211_ENCRYPT_HEADROOM +
547 IEEE80211_ENCRYPT_TAILROOM);
548 if (!frag)
549 goto fail;
550 /* Make sure that all fragments use the same priority so
551 * that they end up using the same TX queue */
552 frag->priority = first->priority;
553 skb_reserve(frag, tx->local->tx_headroom +
554 IEEE80211_ENCRYPT_HEADROOM);
555 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
556 memcpy(fhdr, first->data, hdrlen);
557 if (i == num_fragm - 2)
558 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
559 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
560 copylen = left > per_fragm ? per_fragm : left;
561 memcpy(skb_put(frag, copylen), pos, copylen);
562
563 pos += copylen;
564 left -= copylen;
565 }
566 skb_trim(first, hdrlen + per_fragm);
567
568 tx->u.tx.num_extra_frag = num_fragm - 1;
569 tx->u.tx.extra_frag = frags;
570
571 return TX_CONTINUE;
572
573 fail:
574 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
575 if (frags) {
576 for (i = 0; i < num_fragm - 1; i++)
577 if (frags[i])
578 dev_kfree_skb(frags[i]);
579 kfree(frags);
580 }
581 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
582 return TX_DROP;
583 }
584
585 static ieee80211_tx_result
586 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
587 {
588 if (!tx->key)
589 return TX_CONTINUE;
590
591 switch (tx->key->conf.alg) {
592 case ALG_WEP:
593 return ieee80211_crypto_wep_encrypt(tx);
594 case ALG_TKIP:
595 return ieee80211_crypto_tkip_encrypt(tx);
596 case ALG_CCMP:
597 return ieee80211_crypto_ccmp_encrypt(tx);
598 }
599
600 /* not reached */
601 WARN_ON(1);
602 return TX_DROP;
603 }
604
605 static ieee80211_tx_result
606 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
607 {
608 struct rate_selection rsel;
609 struct ieee80211_supported_band *sband;
610
611 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
612
613 if (likely(!tx->u.tx.rate)) {
614 rate_control_get_rate(tx->dev, sband, tx->skb, &rsel);
615 tx->u.tx.rate = rsel.rate;
616 if (unlikely(rsel.probe)) {
617 tx->u.tx.control->flags |=
618 IEEE80211_TXCTL_RATE_CTRL_PROBE;
619 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
620 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate;
621 tx->u.tx.rate = rsel.probe;
622 } else
623 tx->u.tx.control->alt_retry_rate = NULL;
624
625 if (!tx->u.tx.rate)
626 return TX_DROP;
627 } else
628 tx->u.tx.control->alt_retry_rate = NULL;
629
630 if (tx->sdata->bss_conf.use_cts_prot &&
631 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
632 tx->u.tx.last_frag_rate = tx->u.tx.rate;
633 if (rsel.probe)
634 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
635 else
636 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
637 tx->u.tx.rate = rsel.nonerp;
638 tx->u.tx.control->tx_rate = rsel.nonerp;
639 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
640 } else {
641 tx->u.tx.last_frag_rate = tx->u.tx.rate;
642 tx->u.tx.control->tx_rate = tx->u.tx.rate;
643 }
644 tx->u.tx.control->tx_rate = tx->u.tx.rate;
645
646 return TX_CONTINUE;
647 }
648
649 static ieee80211_tx_result
650 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
651 {
652 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
653 u16 fc = le16_to_cpu(hdr->frame_control);
654 u16 dur;
655 struct ieee80211_tx_control *control = tx->u.tx.control;
656
657 if (!control->retry_limit) {
658 if (!is_multicast_ether_addr(hdr->addr1)) {
659 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
660 && tx->local->rts_threshold <
661 IEEE80211_MAX_RTS_THRESHOLD) {
662 control->flags |=
663 IEEE80211_TXCTL_USE_RTS_CTS;
664 control->flags |=
665 IEEE80211_TXCTL_LONG_RETRY_LIMIT;
666 control->retry_limit =
667 tx->local->long_retry_limit;
668 } else {
669 control->retry_limit =
670 tx->local->short_retry_limit;
671 }
672 } else {
673 control->retry_limit = 1;
674 }
675 }
676
677 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
678 /* Do not use multiple retry rates when sending fragmented
679 * frames.
680 * TODO: The last fragment could still use multiple retry
681 * rates. */
682 control->alt_retry_rate = NULL;
683 }
684
685 /* Use CTS protection for unicast frames sent using extended rates if
686 * there are associated non-ERP stations and RTS/CTS is not configured
687 * for the frame. */
688 if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) &&
689 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP_G) &&
690 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
691 tx->sdata->bss_conf.use_cts_prot &&
692 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
693 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
694
695 /* Transmit data frames using short preambles if the driver supports
696 * short preambles at the selected rate and short preambles are
697 * available on the network at the current point in time. */
698 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
699 (tx->u.tx.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) &&
700 tx->sdata->bss_conf.use_short_preamble &&
701 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
702 tx->u.tx.control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
703 }
704
705 /* Setup duration field for the first fragment of the frame. Duration
706 * for remaining fragments will be updated when they are being sent
707 * to low-level driver in ieee80211_tx(). */
708 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
709 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
710 tx->u.tx.extra_frag[0]->len : 0);
711 hdr->duration_id = cpu_to_le16(dur);
712
713 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
714 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
715 struct ieee80211_supported_band *sband;
716 struct ieee80211_rate *rate, *baserate;
717 int idx;
718
719 sband = tx->local->hw.wiphy->bands[
720 tx->local->hw.conf.channel->band];
721
722 /* Do not use multiple retry rates when using RTS/CTS */
723 control->alt_retry_rate = NULL;
724
725 /* Use min(data rate, max base rate) as CTS/RTS rate */
726 rate = tx->u.tx.rate;
727 baserate = NULL;
728
729 for (idx = 0; idx < sband->n_bitrates; idx++) {
730 if (sband->bitrates[idx].bitrate > rate->bitrate)
731 continue;
732 if (tx->sdata->basic_rates & BIT(idx) &&
733 (!baserate ||
734 (baserate->bitrate < sband->bitrates[idx].bitrate)))
735 baserate = &sband->bitrates[idx];
736 }
737
738 if (baserate)
739 control->rts_cts_rate = baserate;
740 else
741 control->rts_cts_rate = &sband->bitrates[0];
742 }
743
744 if (tx->sta) {
745 tx->sta->tx_packets++;
746 tx->sta->tx_fragments++;
747 tx->sta->tx_bytes += tx->skb->len;
748 if (tx->u.tx.extra_frag) {
749 int i;
750 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
751 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
752 tx->sta->tx_bytes +=
753 tx->u.tx.extra_frag[i]->len;
754 }
755 }
756 }
757
758 return TX_CONTINUE;
759 }
760
761 static ieee80211_tx_result
762 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
763 {
764 struct ieee80211_local *local = tx->local;
765 struct sk_buff *skb = tx->skb;
766 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
767 u32 load = 0, hdrtime;
768 struct ieee80211_rate *rate = tx->u.tx.rate;
769
770 /* TODO: this could be part of tx_status handling, so that the number
771 * of retries would be known; TX rate should in that case be stored
772 * somewhere with the packet */
773
774 /* Estimate total channel use caused by this frame */
775
776 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
777 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
778
779 if (tx->u.tx.channel->band == IEEE80211_BAND_5GHZ ||
780 (tx->u.tx.channel->band == IEEE80211_BAND_2GHZ &&
781 rate->flags & IEEE80211_RATE_ERP_G))
782 hdrtime = CHAN_UTIL_HDR_SHORT;
783 else
784 hdrtime = CHAN_UTIL_HDR_LONG;
785
786 load = hdrtime;
787 if (!is_multicast_ether_addr(hdr->addr1))
788 load += hdrtime;
789
790 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
791 load += 2 * hdrtime;
792 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
793 load += hdrtime;
794
795 /* TODO: optimise again */
796 load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
797
798 if (tx->u.tx.extra_frag) {
799 int i;
800 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
801 load += 2 * hdrtime;
802 load += tx->u.tx.extra_frag[i]->len *
803 tx->u.tx.rate->bitrate;
804 }
805 }
806
807 /* Divide channel_use by 8 to avoid wrapping around the counter */
808 load >>= CHAN_UTIL_SHIFT;
809 local->channel_use_raw += load;
810 if (tx->sta)
811 tx->sta->channel_use_raw += load;
812 tx->sdata->channel_use_raw += load;
813
814 return TX_CONTINUE;
815 }
816
817
818 typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_txrx_data *);
819 static ieee80211_tx_handler ieee80211_tx_handlers[] =
820 {
821 ieee80211_tx_h_check_assoc,
822 ieee80211_tx_h_sequence,
823 ieee80211_tx_h_ps_buf,
824 ieee80211_tx_h_select_key,
825 ieee80211_tx_h_michael_mic_add,
826 ieee80211_tx_h_fragment,
827 ieee80211_tx_h_encrypt,
828 ieee80211_tx_h_rate_ctrl,
829 ieee80211_tx_h_misc,
830 ieee80211_tx_h_load_stats,
831 NULL
832 };
833
834 /* actual transmit path */
835
836 /*
837 * deal with packet injection down monitor interface
838 * with Radiotap Header -- only called for monitor mode interface
839 */
840 static ieee80211_tx_result
841 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
842 struct sk_buff *skb)
843 {
844 /*
845 * this is the moment to interpret and discard the radiotap header that
846 * must be at the start of the packet injected in Monitor mode
847 *
848 * Need to take some care with endian-ness since radiotap
849 * args are little-endian
850 */
851
852 struct ieee80211_radiotap_iterator iterator;
853 struct ieee80211_radiotap_header *rthdr =
854 (struct ieee80211_radiotap_header *) skb->data;
855 struct ieee80211_supported_band *sband;
856 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
857 struct ieee80211_tx_control *control = tx->u.tx.control;
858
859 sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band];
860
861 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
862 tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
863 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
864
865 /*
866 * for every radiotap entry that is present
867 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
868 * entries present, or -EINVAL on error)
869 */
870
871 while (!ret) {
872 int i, target_rate;
873
874 ret = ieee80211_radiotap_iterator_next(&iterator);
875
876 if (ret)
877 continue;
878
879 /* see if this argument is something we can use */
880 switch (iterator.this_arg_index) {
881 /*
882 * You must take care when dereferencing iterator.this_arg
883 * for multibyte types... the pointer is not aligned. Use
884 * get_unaligned((type *)iterator.this_arg) to dereference
885 * iterator.this_arg for type "type" safely on all arches.
886 */
887 case IEEE80211_RADIOTAP_RATE:
888 /*
889 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
890 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
891 */
892 target_rate = (*iterator.this_arg) * 5;
893 for (i = 0; i < sband->n_bitrates; i++) {
894 struct ieee80211_rate *r;
895
896 r = &sband->bitrates[i];
897
898 if (r->bitrate == target_rate) {
899 tx->u.tx.rate = r;
900 break;
901 }
902 }
903 break;
904
905 case IEEE80211_RADIOTAP_ANTENNA:
906 /*
907 * radiotap uses 0 for 1st ant, mac80211 is 1 for
908 * 1st ant
909 */
910 control->antenna_sel_tx = (*iterator.this_arg) + 1;
911 break;
912
913 #if 0
914 case IEEE80211_RADIOTAP_DBM_TX_POWER:
915 control->power_level = *iterator.this_arg;
916 break;
917 #endif
918
919 case IEEE80211_RADIOTAP_FLAGS:
920 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
921 /*
922 * this indicates that the skb we have been
923 * handed has the 32-bit FCS CRC at the end...
924 * we should react to that by snipping it off
925 * because it will be recomputed and added
926 * on transmission
927 */
928 if (skb->len < (iterator.max_length + FCS_LEN))
929 return TX_DROP;
930
931 skb_trim(skb, skb->len - FCS_LEN);
932 }
933 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
934 control->flags &=
935 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
936 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
937 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
938 break;
939
940 /*
941 * Please update the file
942 * Documentation/networking/mac80211-injection.txt
943 * when parsing new fields here.
944 */
945
946 default:
947 break;
948 }
949 }
950
951 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
952 return TX_DROP;
953
954 /*
955 * remove the radiotap header
956 * iterator->max_length was sanity-checked against
957 * skb->len by iterator init
958 */
959 skb_pull(skb, iterator.max_length);
960
961 return TX_CONTINUE;
962 }
963
964 /*
965 * initialises @tx
966 */
967 static ieee80211_tx_result
968 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
969 struct sk_buff *skb,
970 struct net_device *dev,
971 struct ieee80211_tx_control *control)
972 {
973 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
974 struct ieee80211_hdr *hdr;
975 struct ieee80211_sub_if_data *sdata;
976
977 int hdrlen;
978
979 memset(tx, 0, sizeof(*tx));
980 tx->skb = skb;
981 tx->dev = dev; /* use original interface */
982 tx->local = local;
983 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
984 tx->u.tx.control = control;
985 /*
986 * Set this flag (used below to indicate "automatic fragmentation"),
987 * it will be cleared/left by radiotap as desired.
988 */
989 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
990
991 /* process and remove the injection radiotap header */
992 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
993 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
994 if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP)
995 return TX_DROP;
996
997 /*
998 * __ieee80211_parse_tx_radiotap has now removed
999 * the radiotap header that was present and pre-filled
1000 * 'tx' with tx control information.
1001 */
1002 }
1003
1004 hdr = (struct ieee80211_hdr *) skb->data;
1005
1006 tx->sta = sta_info_get(local, hdr->addr1);
1007 tx->fc = le16_to_cpu(hdr->frame_control);
1008
1009 if (is_multicast_ether_addr(hdr->addr1)) {
1010 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
1011 control->flags |= IEEE80211_TXCTL_NO_ACK;
1012 } else {
1013 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
1014 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1015 }
1016
1017 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
1018 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
1019 skb->len + FCS_LEN > local->fragmentation_threshold &&
1020 !local->ops->set_frag_threshold)
1021 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
1022 else
1023 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
1024 }
1025
1026 if (!tx->sta)
1027 control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT;
1028 else if (tx->sta->flags & WLAN_STA_CLEAR_PS_FILT) {
1029 control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT;
1030 tx->sta->flags &= ~WLAN_STA_CLEAR_PS_FILT;
1031 }
1032
1033 hdrlen = ieee80211_get_hdrlen(tx->fc);
1034 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1035 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1036 tx->ethertype = (pos[0] << 8) | pos[1];
1037 }
1038 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1039
1040 return TX_CONTINUE;
1041 }
1042
1043 /*
1044 * NB: @tx is uninitialised when passed in here
1045 */
1046 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1047 struct sk_buff *skb,
1048 struct net_device *mdev,
1049 struct ieee80211_tx_control *control)
1050 {
1051 struct ieee80211_tx_packet_data *pkt_data;
1052 struct net_device *dev;
1053
1054 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1055 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
1056 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1057 dev_put(dev);
1058 dev = NULL;
1059 }
1060 if (unlikely(!dev))
1061 return -ENODEV;
1062 /* initialises tx with control */
1063 __ieee80211_tx_prepare(tx, skb, dev, control);
1064 dev_put(dev);
1065 return 0;
1066 }
1067
1068 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1069 struct ieee80211_txrx_data *tx)
1070 {
1071 struct ieee80211_tx_control *control = tx->u.tx.control;
1072 int ret, i;
1073
1074 if (!ieee80211_qdisc_installed(local->mdev) &&
1075 __ieee80211_queue_stopped(local, 0)) {
1076 netif_stop_queue(local->mdev);
1077 return IEEE80211_TX_AGAIN;
1078 }
1079 if (skb) {
1080 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1081 "TX to low-level driver", skb);
1082 ret = local->ops->tx(local_to_hw(local), skb, control);
1083 if (ret)
1084 return IEEE80211_TX_AGAIN;
1085 local->mdev->trans_start = jiffies;
1086 ieee80211_led_tx(local, 1);
1087 }
1088 if (tx->u.tx.extra_frag) {
1089 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1090 IEEE80211_TXCTL_USE_CTS_PROTECT |
1091 IEEE80211_TXCTL_CLEAR_PS_FILT |
1092 IEEE80211_TXCTL_FIRST_FRAGMENT);
1093 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1094 if (!tx->u.tx.extra_frag[i])
1095 continue;
1096 if (__ieee80211_queue_stopped(local, control->queue))
1097 return IEEE80211_TX_FRAG_AGAIN;
1098 if (i == tx->u.tx.num_extra_frag) {
1099 control->tx_rate = tx->u.tx.last_frag_rate;
1100
1101 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
1102 control->flags |=
1103 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1104 else
1105 control->flags &=
1106 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1107 }
1108
1109 ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
1110 "TX to low-level driver",
1111 tx->u.tx.extra_frag[i]);
1112 ret = local->ops->tx(local_to_hw(local),
1113 tx->u.tx.extra_frag[i],
1114 control);
1115 if (ret)
1116 return IEEE80211_TX_FRAG_AGAIN;
1117 local->mdev->trans_start = jiffies;
1118 ieee80211_led_tx(local, 1);
1119 tx->u.tx.extra_frag[i] = NULL;
1120 }
1121 kfree(tx->u.tx.extra_frag);
1122 tx->u.tx.extra_frag = NULL;
1123 }
1124 return IEEE80211_TX_OK;
1125 }
1126
1127 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1128 struct ieee80211_tx_control *control)
1129 {
1130 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1131 struct sta_info *sta;
1132 ieee80211_tx_handler *handler;
1133 struct ieee80211_txrx_data tx;
1134 ieee80211_tx_result res = TX_DROP, res_prepare;
1135 int ret, i;
1136
1137 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1138
1139 if (unlikely(skb->len < 10)) {
1140 dev_kfree_skb(skb);
1141 return 0;
1142 }
1143
1144 /* initialises tx */
1145 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1146
1147 if (res_prepare == TX_DROP) {
1148 dev_kfree_skb(skb);
1149 return 0;
1150 }
1151
1152 /*
1153 * key references are protected using RCU and this requires that
1154 * we are in a read-site RCU section during receive processing
1155 */
1156 rcu_read_lock();
1157
1158 sta = tx.sta;
1159 tx.u.tx.channel = local->hw.conf.channel;
1160
1161 for (handler = ieee80211_tx_handlers; *handler != NULL;
1162 handler++) {
1163 res = (*handler)(&tx);
1164 if (res != TX_CONTINUE)
1165 break;
1166 }
1167
1168 skb = tx.skb; /* handlers are allowed to change skb */
1169
1170 if (sta)
1171 sta_info_put(sta);
1172
1173 if (unlikely(res == TX_DROP)) {
1174 I802_DEBUG_INC(local->tx_handlers_drop);
1175 goto drop;
1176 }
1177
1178 if (unlikely(res == TX_QUEUED)) {
1179 I802_DEBUG_INC(local->tx_handlers_queued);
1180 rcu_read_unlock();
1181 return 0;
1182 }
1183
1184 if (tx.u.tx.extra_frag) {
1185 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1186 int next_len, dur;
1187 struct ieee80211_hdr *hdr =
1188 (struct ieee80211_hdr *)
1189 tx.u.tx.extra_frag[i]->data;
1190
1191 if (i + 1 < tx.u.tx.num_extra_frag) {
1192 next_len = tx.u.tx.extra_frag[i + 1]->len;
1193 } else {
1194 next_len = 0;
1195 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1196 }
1197 dur = ieee80211_duration(&tx, 0, next_len);
1198 hdr->duration_id = cpu_to_le16(dur);
1199 }
1200 }
1201
1202 retry:
1203 ret = __ieee80211_tx(local, skb, &tx);
1204 if (ret) {
1205 struct ieee80211_tx_stored_packet *store =
1206 &local->pending_packet[control->queue];
1207
1208 if (ret == IEEE80211_TX_FRAG_AGAIN)
1209 skb = NULL;
1210 set_bit(IEEE80211_LINK_STATE_PENDING,
1211 &local->state[control->queue]);
1212 smp_mb();
1213 /* When the driver gets out of buffers during sending of
1214 * fragments and calls ieee80211_stop_queue, there is
1215 * a small window between IEEE80211_LINK_STATE_XOFF and
1216 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1217 * gets available in that window (i.e. driver calls
1218 * ieee80211_wake_queue), we would end up with ieee80211_tx
1219 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1220 * continuing transmitting here when that situation is
1221 * possible to have happened. */
1222 if (!__ieee80211_queue_stopped(local, control->queue)) {
1223 clear_bit(IEEE80211_LINK_STATE_PENDING,
1224 &local->state[control->queue]);
1225 goto retry;
1226 }
1227 memcpy(&store->control, control,
1228 sizeof(struct ieee80211_tx_control));
1229 store->skb = skb;
1230 store->extra_frag = tx.u.tx.extra_frag;
1231 store->num_extra_frag = tx.u.tx.num_extra_frag;
1232 store->last_frag_rate = tx.u.tx.last_frag_rate;
1233 store->last_frag_rate_ctrl_probe =
1234 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
1235 }
1236 rcu_read_unlock();
1237 return 0;
1238
1239 drop:
1240 if (skb)
1241 dev_kfree_skb(skb);
1242 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1243 if (tx.u.tx.extra_frag[i])
1244 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1245 kfree(tx.u.tx.extra_frag);
1246 rcu_read_unlock();
1247 return 0;
1248 }
1249
1250 /* device xmit handlers */
1251
1252 int ieee80211_master_start_xmit(struct sk_buff *skb,
1253 struct net_device *dev)
1254 {
1255 struct ieee80211_tx_control control;
1256 struct ieee80211_tx_packet_data *pkt_data;
1257 struct net_device *odev = NULL;
1258 struct ieee80211_sub_if_data *osdata;
1259 int headroom;
1260 int ret;
1261
1262 /*
1263 * copy control out of the skb so other people can use skb->cb
1264 */
1265 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1266 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1267
1268 if (pkt_data->ifindex)
1269 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
1270 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1271 dev_put(odev);
1272 odev = NULL;
1273 }
1274 if (unlikely(!odev)) {
1275 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1276 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1277 "originating device\n", dev->name);
1278 #endif
1279 dev_kfree_skb(skb);
1280 return 0;
1281 }
1282 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1283
1284 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1285 if (skb_headroom(skb) < headroom) {
1286 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1287 dev_kfree_skb(skb);
1288 dev_put(odev);
1289 return 0;
1290 }
1291 }
1292
1293 control.vif = &osdata->vif;
1294 control.type = osdata->vif.type;
1295 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
1296 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1297 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
1298 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1299 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
1300 control.flags |= IEEE80211_TXCTL_REQUEUE;
1301 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
1302 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
1303 if (pkt_data->flags & IEEE80211_TXPD_AMPDU)
1304 control.flags |= IEEE80211_TXCTL_AMPDU;
1305 control.queue = pkt_data->queue;
1306
1307 ret = ieee80211_tx(odev, skb, &control);
1308 dev_put(odev);
1309
1310 return ret;
1311 }
1312
1313 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1314 struct net_device *dev)
1315 {
1316 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1317 struct ieee80211_tx_packet_data *pkt_data;
1318 struct ieee80211_radiotap_header *prthdr =
1319 (struct ieee80211_radiotap_header *)skb->data;
1320 u16 len_rthdr;
1321
1322 /* check for not even having the fixed radiotap header part */
1323 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1324 goto fail; /* too short to be possibly valid */
1325
1326 /* is it a header version we can trust to find length from? */
1327 if (unlikely(prthdr->it_version))
1328 goto fail; /* only version 0 is supported */
1329
1330 /* then there must be a radiotap header with a length we can use */
1331 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1332
1333 /* does the skb contain enough to deliver on the alleged length? */
1334 if (unlikely(skb->len < len_rthdr))
1335 goto fail; /* skb too short for claimed rt header extent */
1336
1337 skb->dev = local->mdev;
1338
1339 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1340 memset(pkt_data, 0, sizeof(*pkt_data));
1341 /* needed because we set skb device to master */
1342 pkt_data->ifindex = dev->ifindex;
1343
1344 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1345
1346 /*
1347 * fix up the pointers accounting for the radiotap
1348 * header still being in there. We are being given
1349 * a precooked IEEE80211 header so no need for
1350 * normal processing
1351 */
1352 skb_set_mac_header(skb, len_rthdr);
1353 /*
1354 * these are just fixed to the end of the rt area since we
1355 * don't have any better information and at this point, nobody cares
1356 */
1357 skb_set_network_header(skb, len_rthdr);
1358 skb_set_transport_header(skb, len_rthdr);
1359
1360 /* pass the radiotap header up to the next stage intact */
1361 dev_queue_xmit(skb);
1362 return NETDEV_TX_OK;
1363
1364 fail:
1365 dev_kfree_skb(skb);
1366 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1367 }
1368
1369 /**
1370 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1371 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1372 * @skb: packet to be sent
1373 * @dev: incoming interface
1374 *
1375 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1376 * not be freed, and caller is responsible for either retrying later or freeing
1377 * skb).
1378 *
1379 * This function takes in an Ethernet header and encapsulates it with suitable
1380 * IEEE 802.11 header based on which interface the packet is coming in. The
1381 * encapsulated packet will then be passed to master interface, wlan#.11, for
1382 * transmission (through low-level driver).
1383 */
1384 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1385 struct net_device *dev)
1386 {
1387 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1388 struct ieee80211_tx_packet_data *pkt_data;
1389 struct ieee80211_sub_if_data *sdata;
1390 int ret = 1, head_need;
1391 u16 ethertype, hdrlen, meshhdrlen = 0, fc;
1392 struct ieee80211_hdr hdr;
1393 struct ieee80211s_hdr mesh_hdr;
1394 const u8 *encaps_data;
1395 int encaps_len, skip_header_bytes;
1396 int nh_pos, h_pos;
1397 struct sta_info *sta;
1398 u32 sta_flags = 0;
1399
1400 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1401 if (unlikely(skb->len < ETH_HLEN)) {
1402 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1403 dev->name, skb->len);
1404 ret = 0;
1405 goto fail;
1406 }
1407
1408 nh_pos = skb_network_header(skb) - skb->data;
1409 h_pos = skb_transport_header(skb) - skb->data;
1410
1411 /* convert Ethernet header to proper 802.11 header (based on
1412 * operation mode) */
1413 ethertype = (skb->data[12] << 8) | skb->data[13];
1414 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1415
1416 switch (sdata->vif.type) {
1417 case IEEE80211_IF_TYPE_AP:
1418 case IEEE80211_IF_TYPE_VLAN:
1419 fc |= IEEE80211_FCTL_FROMDS;
1420 /* DA BSSID SA */
1421 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1422 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1423 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1424 hdrlen = 24;
1425 break;
1426 case IEEE80211_IF_TYPE_WDS:
1427 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1428 /* RA TA DA SA */
1429 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1430 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1431 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1432 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1433 hdrlen = 30;
1434 break;
1435 #ifdef CONFIG_MAC80211_MESH
1436 case IEEE80211_IF_TYPE_MESH_POINT:
1437 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1438 /* RA TA DA SA */
1439 if (is_multicast_ether_addr(skb->data))
1440 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1441 else if (mesh_nexthop_lookup(hdr.addr1, skb, dev))
1442 return 0;
1443 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1444 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1445 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1446 if (skb->pkt_type == PACKET_OTHERHOST) {
1447 /* Forwarded frame, keep mesh ttl and seqnum */
1448 struct ieee80211s_hdr *prev_meshhdr;
1449 prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb);
1450 meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr);
1451 memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen);
1452 sdata->u.sta.mshstats.fwded_frames++;
1453 } else {
1454 if (!sdata->u.sta.mshcfg.dot11MeshTTL) {
1455 /* Do not send frames with mesh_ttl == 0 */
1456 sdata->u.sta.mshstats.dropped_frames_ttl++;
1457 ret = 0;
1458 goto fail;
1459 }
1460 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1461 sdata);
1462 }
1463 hdrlen = 30;
1464 break;
1465 #endif
1466 case IEEE80211_IF_TYPE_STA:
1467 fc |= IEEE80211_FCTL_TODS;
1468 /* BSSID SA DA */
1469 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1470 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1471 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1472 hdrlen = 24;
1473 break;
1474 case IEEE80211_IF_TYPE_IBSS:
1475 /* DA SA BSSID */
1476 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1477 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1478 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1479 hdrlen = 24;
1480 break;
1481 default:
1482 ret = 0;
1483 goto fail;
1484 }
1485
1486 /*
1487 * There's no need to try to look up the destination
1488 * if it is a multicast address (which can only happen
1489 * in AP mode)
1490 */
1491 if (!is_multicast_ether_addr(hdr.addr1)) {
1492 sta = sta_info_get(local, hdr.addr1);
1493 if (sta) {
1494 sta_flags = sta->flags;
1495 sta_info_put(sta);
1496 }
1497 }
1498
1499 /* receiver is QoS enabled, use a QoS type frame */
1500 if (sta_flags & WLAN_STA_WME) {
1501 fc |= IEEE80211_STYPE_QOS_DATA;
1502 hdrlen += 2;
1503 }
1504
1505 /*
1506 * Drop unicast frames to unauthorised stations unless they are
1507 * EAPOL frames from the local station.
1508 */
1509 if (unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1510 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1511 !(ethertype == ETH_P_PAE &&
1512 compare_ether_addr(dev->dev_addr,
1513 skb->data + ETH_ALEN) == 0))) {
1514 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1515 DECLARE_MAC_BUF(mac);
1516
1517 if (net_ratelimit())
1518 printk(KERN_DEBUG "%s: dropped frame to %s"
1519 " (unauthorized port)\n", dev->name,
1520 print_mac(mac, hdr.addr1));
1521 #endif
1522
1523 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1524
1525 ret = 0;
1526 goto fail;
1527 }
1528
1529 hdr.frame_control = cpu_to_le16(fc);
1530 hdr.duration_id = 0;
1531 hdr.seq_ctrl = 0;
1532
1533 skip_header_bytes = ETH_HLEN;
1534 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1535 encaps_data = bridge_tunnel_header;
1536 encaps_len = sizeof(bridge_tunnel_header);
1537 skip_header_bytes -= 2;
1538 } else if (ethertype >= 0x600) {
1539 encaps_data = rfc1042_header;
1540 encaps_len = sizeof(rfc1042_header);
1541 skip_header_bytes -= 2;
1542 } else {
1543 encaps_data = NULL;
1544 encaps_len = 0;
1545 }
1546
1547 skb_pull(skb, skip_header_bytes);
1548 nh_pos -= skip_header_bytes;
1549 h_pos -= skip_header_bytes;
1550
1551 /* TODO: implement support for fragments so that there is no need to
1552 * reallocate and copy payload; it might be enough to support one
1553 * extra fragment that would be copied in the beginning of the frame
1554 * data.. anyway, it would be nice to include this into skb structure
1555 * somehow
1556 *
1557 * There are few options for this:
1558 * use skb->cb as an extra space for 802.11 header
1559 * allocate new buffer if not enough headroom
1560 * make sure that there is enough headroom in every skb by increasing
1561 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1562 * alloc_skb() (net/core/skbuff.c)
1563 */
1564 head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom;
1565 head_need -= skb_headroom(skb);
1566
1567 /* We are going to modify skb data, so make a copy of it if happens to
1568 * be cloned. This could happen, e.g., with Linux bridge code passing
1569 * us broadcast frames. */
1570
1571 if (head_need > 0 || skb_cloned(skb)) {
1572 #if 0
1573 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1574 "of headroom\n", dev->name, head_need);
1575 #endif
1576
1577 if (skb_cloned(skb))
1578 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1579 else
1580 I802_DEBUG_INC(local->tx_expand_skb_head);
1581 /* Since we have to reallocate the buffer, make sure that there
1582 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1583 * before payload and 12 after). */
1584 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1585 12, GFP_ATOMIC)) {
1586 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1587 "\n", dev->name);
1588 goto fail;
1589 }
1590 }
1591
1592 if (encaps_data) {
1593 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1594 nh_pos += encaps_len;
1595 h_pos += encaps_len;
1596 }
1597
1598 if (meshhdrlen > 0) {
1599 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1600 nh_pos += meshhdrlen;
1601 h_pos += meshhdrlen;
1602 }
1603
1604 if (fc & IEEE80211_STYPE_QOS_DATA) {
1605 __le16 *qos_control;
1606
1607 qos_control = (__le16*) skb_push(skb, 2);
1608 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1609 /*
1610 * Maybe we could actually set some fields here, for now just
1611 * initialise to zero to indicate no special operation.
1612 */
1613 *qos_control = 0;
1614 } else
1615 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1616
1617 nh_pos += hdrlen;
1618 h_pos += hdrlen;
1619
1620 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1621 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1622 pkt_data->ifindex = dev->ifindex;
1623 if (ethertype == ETH_P_PAE)
1624 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1625
1626 skb->dev = local->mdev;
1627 dev->stats.tx_packets++;
1628 dev->stats.tx_bytes += skb->len;
1629
1630 /* Update skb pointers to various headers since this modified frame
1631 * is going to go through Linux networking code that may potentially
1632 * need things like pointer to IP header. */
1633 skb_set_mac_header(skb, 0);
1634 skb_set_network_header(skb, nh_pos);
1635 skb_set_transport_header(skb, h_pos);
1636
1637 dev->trans_start = jiffies;
1638 dev_queue_xmit(skb);
1639
1640 return 0;
1641
1642 fail:
1643 if (!ret)
1644 dev_kfree_skb(skb);
1645
1646 return ret;
1647 }
1648
1649 /* helper functions for pending packets for when queues are stopped */
1650
1651 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1652 {
1653 int i, j;
1654 struct ieee80211_tx_stored_packet *store;
1655
1656 for (i = 0; i < local->hw.queues; i++) {
1657 if (!__ieee80211_queue_pending(local, i))
1658 continue;
1659 store = &local->pending_packet[i];
1660 kfree_skb(store->skb);
1661 for (j = 0; j < store->num_extra_frag; j++)
1662 kfree_skb(store->extra_frag[j]);
1663 kfree(store->extra_frag);
1664 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1665 }
1666 }
1667
1668 void ieee80211_tx_pending(unsigned long data)
1669 {
1670 struct ieee80211_local *local = (struct ieee80211_local *)data;
1671 struct net_device *dev = local->mdev;
1672 struct ieee80211_tx_stored_packet *store;
1673 struct ieee80211_txrx_data tx;
1674 int i, ret, reschedule = 0;
1675
1676 netif_tx_lock_bh(dev);
1677 for (i = 0; i < local->hw.queues; i++) {
1678 if (__ieee80211_queue_stopped(local, i))
1679 continue;
1680 if (!__ieee80211_queue_pending(local, i)) {
1681 reschedule = 1;
1682 continue;
1683 }
1684 store = &local->pending_packet[i];
1685 tx.u.tx.control = &store->control;
1686 tx.u.tx.extra_frag = store->extra_frag;
1687 tx.u.tx.num_extra_frag = store->num_extra_frag;
1688 tx.u.tx.last_frag_rate = store->last_frag_rate;
1689 tx.flags = 0;
1690 if (store->last_frag_rate_ctrl_probe)
1691 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
1692 ret = __ieee80211_tx(local, store->skb, &tx);
1693 if (ret) {
1694 if (ret == IEEE80211_TX_FRAG_AGAIN)
1695 store->skb = NULL;
1696 } else {
1697 clear_bit(IEEE80211_LINK_STATE_PENDING,
1698 &local->state[i]);
1699 reschedule = 1;
1700 }
1701 }
1702 netif_tx_unlock_bh(dev);
1703 if (reschedule) {
1704 if (!ieee80211_qdisc_installed(dev)) {
1705 if (!__ieee80211_queue_stopped(local, 0))
1706 netif_wake_queue(dev);
1707 } else
1708 netif_schedule(dev);
1709 }
1710 }
1711
1712 /* functions for drivers to get certain frames */
1713
1714 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1715 struct ieee80211_if_ap *bss,
1716 struct sk_buff *skb,
1717 struct beacon_data *beacon)
1718 {
1719 u8 *pos, *tim;
1720 int aid0 = 0;
1721 int i, have_bits = 0, n1, n2;
1722
1723 /* Generate bitmap for TIM only if there are any STAs in power save
1724 * mode. */
1725 read_lock_bh(&local->sta_lock);
1726 if (atomic_read(&bss->num_sta_ps) > 0)
1727 /* in the hope that this is faster than
1728 * checking byte-for-byte */
1729 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1730 IEEE80211_MAX_AID+1);
1731
1732 if (bss->dtim_count == 0)
1733 bss->dtim_count = beacon->dtim_period - 1;
1734 else
1735 bss->dtim_count--;
1736
1737 tim = pos = (u8 *) skb_put(skb, 6);
1738 *pos++ = WLAN_EID_TIM;
1739 *pos++ = 4;
1740 *pos++ = bss->dtim_count;
1741 *pos++ = beacon->dtim_period;
1742
1743 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1744 aid0 = 1;
1745
1746 if (have_bits) {
1747 /* Find largest even number N1 so that bits numbered 1 through
1748 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1749 * (N2 + 1) x 8 through 2007 are 0. */
1750 n1 = 0;
1751 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1752 if (bss->tim[i]) {
1753 n1 = i & 0xfe;
1754 break;
1755 }
1756 }
1757 n2 = n1;
1758 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1759 if (bss->tim[i]) {
1760 n2 = i;
1761 break;
1762 }
1763 }
1764
1765 /* Bitmap control */
1766 *pos++ = n1 | aid0;
1767 /* Part Virt Bitmap */
1768 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1769
1770 tim[1] = n2 - n1 + 4;
1771 skb_put(skb, n2 - n1);
1772 } else {
1773 *pos++ = aid0; /* Bitmap control */
1774 *pos++ = 0; /* Part Virt Bitmap */
1775 }
1776 read_unlock_bh(&local->sta_lock);
1777 }
1778
1779 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1780 struct ieee80211_vif *vif,
1781 struct ieee80211_tx_control *control)
1782 {
1783 struct ieee80211_local *local = hw_to_local(hw);
1784 struct sk_buff *skb;
1785 struct net_device *bdev;
1786 struct ieee80211_sub_if_data *sdata = NULL;
1787 struct ieee80211_if_ap *ap = NULL;
1788 struct rate_selection rsel;
1789 struct beacon_data *beacon;
1790 struct ieee80211_supported_band *sband;
1791 struct ieee80211_mgmt *mgmt;
1792 int *num_beacons;
1793 bool err = true;
1794 u8 *pos;
1795
1796 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1797
1798 rcu_read_lock();
1799
1800 sdata = vif_to_sdata(vif);
1801 bdev = sdata->dev;
1802
1803 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1804 ap = &sdata->u.ap;
1805 beacon = rcu_dereference(ap->beacon);
1806 if (ap && beacon) {
1807 /*
1808 * headroom, head length,
1809 * tail length and maximum TIM length
1810 */
1811 skb = dev_alloc_skb(local->tx_headroom +
1812 beacon->head_len +
1813 beacon->tail_len + 256);
1814 if (!skb)
1815 goto out;
1816
1817 skb_reserve(skb, local->tx_headroom);
1818 memcpy(skb_put(skb, beacon->head_len), beacon->head,
1819 beacon->head_len);
1820
1821 ieee80211_include_sequence(sdata,
1822 (struct ieee80211_hdr *)skb->data);
1823
1824 ieee80211_beacon_add_tim(local, ap, skb, beacon);
1825
1826 if (beacon->tail)
1827 memcpy(skb_put(skb, beacon->tail_len),
1828 beacon->tail, beacon->tail_len);
1829
1830 num_beacons = &ap->num_beacons;
1831
1832 err = false;
1833 }
1834 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1835 /* headroom, head length, tail length and maximum TIM length */
1836 skb = dev_alloc_skb(local->tx_headroom + 400);
1837 if (!skb)
1838 goto out;
1839
1840 skb_reserve(skb, local->hw.extra_tx_headroom);
1841 mgmt = (struct ieee80211_mgmt *)
1842 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1843 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1844 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1845 IEEE80211_STYPE_BEACON);
1846 memset(mgmt->da, 0xff, ETH_ALEN);
1847 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1848 /* BSSID is left zeroed, wildcard value */
1849 mgmt->u.beacon.beacon_int =
1850 cpu_to_le16(local->hw.conf.beacon_int);
1851 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
1852
1853 pos = skb_put(skb, 2);
1854 *pos++ = WLAN_EID_SSID;
1855 *pos++ = 0x0;
1856
1857 mesh_mgmt_ies_add(skb, sdata->dev);
1858
1859 num_beacons = &sdata->u.sta.num_beacons;
1860
1861 err = false;
1862 }
1863
1864 if (err) {
1865 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1866 if (net_ratelimit())
1867 printk(KERN_DEBUG "no beacon data avail for %s\n",
1868 bdev->name);
1869 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1870 skb = NULL;
1871 goto out;
1872 }
1873
1874 if (control) {
1875 rate_control_get_rate(local->mdev, sband, skb, &rsel);
1876 if (!rsel.rate) {
1877 if (net_ratelimit()) {
1878 printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
1879 "no rate found\n",
1880 wiphy_name(local->hw.wiphy));
1881 }
1882 dev_kfree_skb(skb);
1883 skb = NULL;
1884 goto out;
1885 }
1886
1887 control->vif = vif;
1888 control->tx_rate = rsel.rate;
1889 if (sdata->bss_conf.use_short_preamble &&
1890 rsel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
1891 control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
1892 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1893 control->flags |= IEEE80211_TXCTL_NO_ACK;
1894 control->retry_limit = 1;
1895 control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT;
1896 }
1897 (*num_beacons)++;
1898 out:
1899 rcu_read_unlock();
1900 return skb;
1901 }
1902 EXPORT_SYMBOL(ieee80211_beacon_get);
1903
1904 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1905 const void *frame, size_t frame_len,
1906 const struct ieee80211_tx_control *frame_txctl,
1907 struct ieee80211_rts *rts)
1908 {
1909 const struct ieee80211_hdr *hdr = frame;
1910 u16 fctl;
1911
1912 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1913 rts->frame_control = cpu_to_le16(fctl);
1914 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
1915 frame_txctl);
1916 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1917 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1918 }
1919 EXPORT_SYMBOL(ieee80211_rts_get);
1920
1921 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1922 const void *frame, size_t frame_len,
1923 const struct ieee80211_tx_control *frame_txctl,
1924 struct ieee80211_cts *cts)
1925 {
1926 const struct ieee80211_hdr *hdr = frame;
1927 u16 fctl;
1928
1929 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1930 cts->frame_control = cpu_to_le16(fctl);
1931 cts->duration = ieee80211_ctstoself_duration(hw, vif,
1932 frame_len, frame_txctl);
1933 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1934 }
1935 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1936
1937 struct sk_buff *
1938 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
1939 struct ieee80211_vif *vif,
1940 struct ieee80211_tx_control *control)
1941 {
1942 struct ieee80211_local *local = hw_to_local(hw);
1943 struct sk_buff *skb;
1944 struct sta_info *sta;
1945 ieee80211_tx_handler *handler;
1946 struct ieee80211_txrx_data tx;
1947 ieee80211_tx_result res = TX_DROP;
1948 struct net_device *bdev;
1949 struct ieee80211_sub_if_data *sdata;
1950 struct ieee80211_if_ap *bss = NULL;
1951 struct beacon_data *beacon;
1952
1953 sdata = vif_to_sdata(vif);
1954 bdev = sdata->dev;
1955
1956
1957 if (!bss)
1958 return NULL;
1959
1960 rcu_read_lock();
1961 beacon = rcu_dereference(bss->beacon);
1962
1963 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
1964 !beacon->head) {
1965 rcu_read_unlock();
1966 return NULL;
1967 }
1968 rcu_read_unlock();
1969
1970 if (bss->dtim_count != 0)
1971 return NULL; /* send buffered bc/mc only after DTIM beacon */
1972 memset(control, 0, sizeof(*control));
1973 while (1) {
1974 skb = skb_dequeue(&bss->ps_bc_buf);
1975 if (!skb)
1976 return NULL;
1977 local->total_ps_buffered--;
1978
1979 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1980 struct ieee80211_hdr *hdr =
1981 (struct ieee80211_hdr *) skb->data;
1982 /* more buffered multicast/broadcast frames ==> set
1983 * MoreData flag in IEEE 802.11 header to inform PS
1984 * STAs */
1985 hdr->frame_control |=
1986 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1987 }
1988
1989 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
1990 break;
1991 dev_kfree_skb_any(skb);
1992 }
1993 sta = tx.sta;
1994 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
1995 tx.u.tx.channel = local->hw.conf.channel;
1996
1997 for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) {
1998 res = (*handler)(&tx);
1999 if (res == TX_DROP || res == TX_QUEUED)
2000 break;
2001 }
2002 skb = tx.skb; /* handlers are allowed to change skb */
2003
2004 if (res == TX_DROP) {
2005 I802_DEBUG_INC(local->tx_handlers_drop);
2006 dev_kfree_skb(skb);
2007 skb = NULL;
2008 } else if (res == TX_QUEUED) {
2009 I802_DEBUG_INC(local->tx_handlers_queued);
2010 skb = NULL;
2011 }
2012
2013 if (sta)
2014 sta_info_put(sta);
2015
2016 return skb;
2017 }
2018 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux kernel - Deliverables
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