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[MAC80211]: ignore key index on pairwise key (WEP only)
[deliverable/linux.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;
57
58 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
59 if (skb->len < 4) {
60 printk("\n");
61 return;
62 }
63
64 fc = le16_to_cpu(hdr->frame_control);
65 hdrlen = ieee80211_get_hdrlen(fc);
66 if (hdrlen > skb->len)
67 hdrlen = skb->len;
68 if (hdrlen >= 4)
69 printk(" FC=0x%04x DUR=0x%04x",
70 fc, le16_to_cpu(hdr->duration_id));
71 if (hdrlen >= 10)
72 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
73 if (hdrlen >= 16)
74 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
75 if (hdrlen >= 24)
76 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
77 if (hdrlen >= 30)
78 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
79 printk("\n");
80}
81#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
82static inline void ieee80211_dump_frame(const char *ifname, const char *title,
83 struct sk_buff *skb)
84{
85}
86#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
87
88static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
89 int next_frag_len)
90{
91 int rate, mrate, erp, dur, i;
92 struct ieee80211_rate *txrate = tx->u.tx.rate;
93 struct ieee80211_local *local = tx->local;
94 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
95
96 erp = txrate->flags & IEEE80211_RATE_ERP;
97
98 /*
99 * data and mgmt (except PS Poll):
100 * - during CFP: 32768
101 * - during contention period:
102 * if addr1 is group address: 0
103 * if more fragments = 0 and addr1 is individual address: time to
104 * transmit one ACK plus SIFS
105 * if more fragments = 1 and addr1 is individual address: time to
106 * transmit next fragment plus 2 x ACK plus 3 x SIFS
107 *
108 * IEEE 802.11, 9.6:
109 * - control response frame (CTS or ACK) shall be transmitted using the
110 * same rate as the immediately previous frame in the frame exchange
111 * sequence, if this rate belongs to the PHY mandatory rates, or else
112 * at the highest possible rate belonging to the PHY rates in the
113 * BSSBasicRateSet
114 */
115
116 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
117 /* TODO: These control frames are not currently sent by
118 * 80211.o, but should they be implemented, this function
119 * needs to be updated to support duration field calculation.
120 *
121 * RTS: time needed to transmit pending data/mgmt frame plus
122 * one CTS frame plus one ACK frame plus 3 x SIFS
123 * CTS: duration of immediately previous RTS minus time
124 * required to transmit CTS and its SIFS
125 * ACK: 0 if immediately previous directed data/mgmt had
126 * more=0, with more=1 duration in ACK frame is duration
127 * from previous frame minus time needed to transmit ACK
128 * and its SIFS
129 * PS Poll: BIT(15) | BIT(14) | aid
130 */
131 return 0;
132 }
133
134 /* data/mgmt */
135 if (0 /* FIX: data/mgmt during CFP */)
136 return 32768;
137
138 if (group_addr) /* Group address as the destination - no ACK */
139 return 0;
140
141 /* Individual destination address:
142 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
143 * CTS and ACK frames shall be transmitted using the highest rate in
144 * basic rate set that is less than or equal to the rate of the
145 * immediately previous frame and that is using the same modulation
146 * (CCK or OFDM). If no basic rate set matches with these requirements,
147 * the highest mandatory rate of the PHY that is less than or equal to
148 * the rate of the previous frame is used.
149 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
150 */
151 rate = -1;
152 mrate = 10; /* use 1 Mbps if everything fails */
153 for (i = 0; i < mode->num_rates; i++) {
154 struct ieee80211_rate *r = &mode->rates[i];
155 if (r->rate > txrate->rate)
156 break;
157
158 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
159 IEEE80211_RATE_MODULATION(r->flags))
160 continue;
161
162 if (r->flags & IEEE80211_RATE_BASIC)
163 rate = r->rate;
164 else if (r->flags & IEEE80211_RATE_MANDATORY)
165 mrate = r->rate;
166 }
167 if (rate == -1) {
168 /* No matching basic rate found; use highest suitable mandatory
169 * PHY rate */
170 rate = mrate;
171 }
172
173 /* Time needed to transmit ACK
174 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
175 * to closest integer */
176
177 dur = ieee80211_frame_duration(local, 10, rate, erp,
13262ffd 178 tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 179
180 if (next_frag_len) {
181 /* Frame is fragmented: duration increases with time needed to
182 * transmit next fragment plus ACK and 2 x SIFS. */
183 dur *= 2; /* ACK + SIFS */
184 /* next fragment */
185 dur += ieee80211_frame_duration(local, next_frag_len,
13262ffd
JS		 186 txrate->rate, erp,
187 tx->sdata->flags &
188 IEEE80211_SDATA_SHORT_PREAMBLE);
e2ebc74d
JB		 189 }
190
191 return dur;
192}
193
194static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
195 int queue)
196{
197 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
198}
199
200static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
201 int queue)
202{
203 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
204}
205
206static int inline is_ieee80211_device(struct net_device *dev,
207 struct net_device *master)
208{
209 return (wdev_priv(dev->ieee80211_ptr) ==
210 wdev_priv(master->ieee80211_ptr));
211}
212
213/* tx handlers */
214
215static ieee80211_txrx_result
216ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
217{
218#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
219 struct sk_buff *skb = tx->skb;
220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
221#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
222 u32 sta_flags;
223
224 if (unlikely(tx->local->sta_scanning != 0) &&
225 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
226 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
227 return TXRX_DROP;
228
badffb72 229 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
e2ebc74d
JB		 230 return TXRX_CONTINUE;
231
232 sta_flags = tx->sta ? tx->sta->flags : 0;
233
badffb72 234 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
e2ebc74d
JB		 235 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
236 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
237 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
238#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 printk(KERN_DEBUG "%s: dropped data frame to not "
240 "associated station " MAC_FMT "\n",
241 tx->dev->name, MAC_ARG(hdr->addr1));
242#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
243 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
244 return TXRX_DROP;
245 }
246 } else {
247 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
248 tx->local->num_sta == 0 &&
e2ebc74d
JB		 249 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
250 /*
251 * No associated STAs - no need to send multicast
252 * frames.
253 */
254 return TXRX_DROP;
255 }
256 return TXRX_CONTINUE;
257 }
258
259 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
260 !(sta_flags & WLAN_STA_AUTHORIZED))) {
261#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
263 " (unauthorized port)\n", tx->dev->name,
264 MAC_ARG(hdr->addr1));
265#endif
266 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
267 return TXRX_DROP;
268 }
269
270 return TXRX_CONTINUE;
271}
272
273static ieee80211_txrx_result
274ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
275{
276 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
277
278 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
279 ieee80211_include_sequence(tx->sdata, hdr);
280
281 return TXRX_CONTINUE;
282}
283
284/* This function is called whenever the AP is about to exceed the maximum limit
285 * of buffered frames for power saving STAs. This situation should not really
286 * happen often during normal operation, so dropping the oldest buffered packet
287 * from each queue should be OK to make some room for new frames. */
288static void purge_old_ps_buffers(struct ieee80211_local *local)
289{
290 int total = 0, purged = 0;
291 struct sk_buff *skb;
292 struct ieee80211_sub_if_data *sdata;
293 struct sta_info *sta;
294
295 read_lock(&local->sub_if_lock);
296 list_for_each_entry(sdata, &local->sub_if_list, list) {
297 struct ieee80211_if_ap *ap;
298 if (sdata->dev == local->mdev ||
299 sdata->type != IEEE80211_IF_TYPE_AP)
300 continue;
301 ap = &sdata->u.ap;
302 skb = skb_dequeue(&ap->ps_bc_buf);
303 if (skb) {
304 purged++;
305 dev_kfree_skb(skb);
306 }
307 total += skb_queue_len(&ap->ps_bc_buf);
308 }
309 read_unlock(&local->sub_if_lock);
310
be8755e1 311 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 312 list_for_each_entry(sta, &local->sta_list, list) {
313 skb = skb_dequeue(&sta->ps_tx_buf);
314 if (skb) {
315 purged++;
316 dev_kfree_skb(skb);
317 }
318 total += skb_queue_len(&sta->ps_tx_buf);
319 }
be8755e1 320 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 321
322 local->total_ps_buffered = total;
323 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
324 local->mdev->name, purged);
325}
326
327static inline ieee80211_txrx_result
328ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
329{
330 /* broadcast/multicast frame */
331 /* If any of the associated stations is in power save mode,
332 * the frame is buffered to be sent after DTIM beacon frame */
333 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
334 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
335 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
336 !(tx->fc & IEEE80211_FCTL_ORDER)) {
337 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
338 purge_old_ps_buffers(tx->local);
339 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
340 AP_MAX_BC_BUFFER) {
341 if (net_ratelimit()) {
342 printk(KERN_DEBUG "%s: BC TX buffer full - "
343 "dropping the oldest frame\n",
344 tx->dev->name);
345 }
346 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
347 } else
348 tx->local->total_ps_buffered++;
349 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
350 return TXRX_QUEUED;
351 }
352
353 return TXRX_CONTINUE;
354}
355
356static inline ieee80211_txrx_result
357ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
358{
359 struct sta_info *sta = tx->sta;
360
361 if (unlikely(!sta ||
362 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
363 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
364 return TXRX_CONTINUE;
365
366 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
367 struct ieee80211_tx_packet_data *pkt_data;
368#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
369 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
370 "before %d)\n",
371 MAC_ARG(sta->addr), sta->aid,
372 skb_queue_len(&sta->ps_tx_buf));
373#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
374 sta->flags |= WLAN_STA_TIM;
375 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
376 purge_old_ps_buffers(tx->local);
377 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
378 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
379 if (net_ratelimit()) {
380 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
381 "buffer full - dropping oldest frame\n",
382 tx->dev->name, MAC_ARG(sta->addr));
383 }
384 dev_kfree_skb(old);
385 } else
386 tx->local->total_ps_buffered++;
387 /* Queue frame to be sent after STA sends an PS Poll frame */
388 if (skb_queue_empty(&sta->ps_tx_buf)) {
389 if (tx->local->ops->set_tim)
390 tx->local->ops->set_tim(local_to_hw(tx->local),
391 sta->aid, 1);
392 if (tx->sdata->bss)
393 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
394 }
395 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
396 pkt_data->jiffies = jiffies;
397 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
398 return TXRX_QUEUED;
399 }
400#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 else if (unlikely(sta->flags & WLAN_STA_PS)) {
402 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
403 "set -> send frame\n", tx->dev->name,
404 MAC_ARG(sta->addr));
405 }
406#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
407 sta->pspoll = 0;
408
409 return TXRX_CONTINUE;
410}
411
412
413static ieee80211_txrx_result
414ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
415{
badffb72 416 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
e2ebc74d
JB		 417 return TXRX_CONTINUE;
418
badffb72 419 if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
e2ebc74d
JB		 420 return ieee80211_tx_h_unicast_ps_buf(tx);
421 else
422 return ieee80211_tx_h_multicast_ps_buf(tx);
423}
424
425
426
427
428static ieee80211_txrx_result
429ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
430{
d4e46a3d
JB		 431 struct ieee80211_key *key;
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
JB		 439 else if (tx->sdata->drop_unencrypted &&
440 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
441 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
442 return TXRX_DROP;
6a7664d4 443 } else {
e2ebc74d 444 tx->key = NULL;
6a7664d4
JB		 445 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
446 }
e2ebc74d
JB		 447
448 if (tx->key) {
449 tx->key->tx_rx_count++;
450 if (unlikely(tx->local->key_tx_rx_threshold &&
451 tx->key->tx_rx_count >
452 tx->local->key_tx_rx_threshold)) {
453 ieee80211_key_threshold_notify(tx->dev, tx->key,
454 tx->sta);
455 }
456 }
457
458 return TXRX_CONTINUE;
459}
460
461static ieee80211_txrx_result
462ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
463{
464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
465 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
466 struct sk_buff **frags, *first, *frag;
467 int i;
468 u16 seq;
469 u8 *pos;
470 int frag_threshold = tx->local->fragmentation_threshold;
471
badffb72 472 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
e2ebc74d
JB		 473 return TXRX_CONTINUE;
474
475 first = tx->skb;
476
477 hdrlen = ieee80211_get_hdrlen(tx->fc);
478 payload_len = first->len - hdrlen;
479 per_fragm = frag_threshold - hdrlen - FCS_LEN;
172589cc 480 num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
e2ebc74d
JB		 481
482 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
483 if (!frags)
484 goto fail;
485
486 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
487 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
488 pos = first->data + hdrlen + per_fragm;
489 left = payload_len - per_fragm;
490 for (i = 0; i < num_fragm - 1; i++) {
491 struct ieee80211_hdr *fhdr;
492 size_t copylen;
493
494 if (left <= 0)
495 goto fail;
496
497 /* reserve enough extra head and tail room for possible
498 * encryption */
499 frag = frags[i] =
500 dev_alloc_skb(tx->local->tx_headroom +
501 frag_threshold +
502 IEEE80211_ENCRYPT_HEADROOM +
503 IEEE80211_ENCRYPT_TAILROOM);
504 if (!frag)
505 goto fail;
506 /* Make sure that all fragments use the same priority so
507 * that they end up using the same TX queue */
508 frag->priority = first->priority;
509 skb_reserve(frag, tx->local->tx_headroom +
510 IEEE80211_ENCRYPT_HEADROOM);
511 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
512 memcpy(fhdr, first->data, hdrlen);
513 if (i == num_fragm - 2)
514 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
515 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
516 copylen = left > per_fragm ? per_fragm : left;
517 memcpy(skb_put(frag, copylen), pos, copylen);
518
519 pos += copylen;
520 left -= copylen;
521 }
522 skb_trim(first, hdrlen + per_fragm);
523
524 tx->u.tx.num_extra_frag = num_fragm - 1;
525 tx->u.tx.extra_frag = frags;
526
527 return TXRX_CONTINUE;
528
529 fail:
530 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
531 if (frags) {
532 for (i = 0; i < num_fragm - 1; i++)
533 if (frags[i])
534 dev_kfree_skb(frags[i]);
535 kfree(frags);
536 }
537 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
538 return TXRX_DROP;
539}
540
541static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
542{
11a843b7 543 if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
e2ebc74d
JB		 544 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
545 return -1;
546 } else {
8f20fc24 547 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
7848ba7d
JB		 548 if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
549 if (!ieee80211_wep_add_iv(tx->local, skb, tx->key))
e2ebc74d
JB		 550 return -1;
551 }
552 }
553 return 0;
554}
555
556static ieee80211_txrx_result
557ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
558{
559 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
560 u16 fc;
561
562 fc = le16_to_cpu(hdr->frame_control);
563
8f20fc24 564 if (!tx->key || tx->key->conf.alg != ALG_WEP ||
e2ebc74d
JB		 565 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
566 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
567 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
568 return TXRX_CONTINUE;
569
570 tx->u.tx.control->iv_len = WEP_IV_LEN;
571 tx->u.tx.control->icv_len = WEP_ICV_LEN;
572 ieee80211_tx_set_iswep(tx);
573
574 if (wep_encrypt_skb(tx, tx->skb) < 0) {
575 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
576 return TXRX_DROP;
577 }
578
579 if (tx->u.tx.extra_frag) {
580 int i;
581 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
582 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
583 I802_DEBUG_INC(tx->local->
584 tx_handlers_drop_wep);
585 return TXRX_DROP;
586 }
587 }
588 }
589
590 return TXRX_CONTINUE;
591}
592
593static ieee80211_txrx_result
594ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
595{
596 struct rate_control_extra extra;
597
598 memset(&extra, 0, sizeof(extra));
599 extra.mode = tx->u.tx.mode;
600 extra.mgmt_data = tx->sdata &&
601 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
602 extra.ethertype = tx->ethertype;
603
604 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
605 &extra);
606 if (unlikely(extra.probe != NULL)) {
607 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
badffb72 608 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 609 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
610 tx->u.tx.rate = extra.probe;
611 } else {
612 tx->u.tx.control->alt_retry_rate = -1;
613 }
614 if (!tx->u.tx.rate)
615 return TXRX_DROP;
616 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
13262ffd 617 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
badffb72 618 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
e2ebc74d 619 tx->u.tx.last_frag_rate = tx->u.tx.rate;
badffb72
JS		 620 if (extra.probe)
621 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
622 else
623 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 624 tx->u.tx.rate = extra.nonerp;
625 tx->u.tx.control->rate = extra.nonerp;
626 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
627 } else {
628 tx->u.tx.last_frag_rate = tx->u.tx.rate;
629 tx->u.tx.control->rate = tx->u.tx.rate;
630 }
631 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
e2ebc74d
JB		 632
633 return TXRX_CONTINUE;
634}
635
636static ieee80211_txrx_result
637ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
638{
639 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
7e9ed188 640 u16 fc = le16_to_cpu(hdr->frame_control);
e2ebc74d
JB		 641 u16 dur;
642 struct ieee80211_tx_control *control = tx->u.tx.control;
643 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
644
645 if (!is_multicast_ether_addr(hdr->addr1)) {
646 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
647 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
648 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
d5d08def 649 control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT;
e2ebc74d
JB		 650 control->retry_limit =
651 tx->local->long_retry_limit;
652 } else {
653 control->retry_limit =
654 tx->local->short_retry_limit;
655 }
656 } else {
657 control->retry_limit = 1;
658 }
659
badffb72 660 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
e2ebc74d
JB		 661 /* Do not use multiple retry rates when sending fragmented
662 * frames.
663 * TODO: The last fragment could still use multiple retry
664 * rates. */
665 control->alt_retry_rate = -1;
666 }
667
668 /* Use CTS protection for unicast frames sent using extended rates if
669 * there are associated non-ERP stations and RTS/CTS is not configured
670 * for the frame. */
671 if (mode->mode == MODE_IEEE80211G &&
672 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
badffb72 673 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
13262ffd 674 (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
e2ebc74d
JB		 675 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
676 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
677
7e9ed188
DD		 678 /* Transmit data frames using short preambles if the driver supports
679 * short preambles at the selected rate and short preambles are
680 * available on the network at the current point in time. */
681 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
682 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
13262ffd 683 (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
7e9ed188
DD		 684 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
685 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
686 }
687
e2ebc74d
JB		 688 /* Setup duration field for the first fragment of the frame. Duration
689 * for remaining fragments will be updated when they are being sent
690 * to low-level driver in ieee80211_tx(). */
691 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
badffb72
JS		 692 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
693 tx->u.tx.extra_frag[0]->len : 0);
e2ebc74d
JB		 694 hdr->duration_id = cpu_to_le16(dur);
695
696 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
697 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
698 struct ieee80211_rate *rate;
699
700 /* Do not use multiple retry rates when using RTS/CTS */
701 control->alt_retry_rate = -1;
702
703 /* Use min(data rate, max base rate) as CTS/RTS rate */
704 rate = tx->u.tx.rate;
705 while (rate > mode->rates &&
706 !(rate->flags & IEEE80211_RATE_BASIC))
707 rate--;
708
709 control->rts_cts_rate = rate->val;
710 control->rts_rate = rate;
711 }
712
713 if (tx->sta) {
714 tx->sta->tx_packets++;
715 tx->sta->tx_fragments++;
716 tx->sta->tx_bytes += tx->skb->len;
717 if (tx->u.tx.extra_frag) {
718 int i;
719 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
720 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
721 tx->sta->tx_bytes +=
722 tx->u.tx.extra_frag[i]->len;
723 }
724 }
725 }
726
6a7664d4
JB		 727 /*
728 * Tell hardware to not encrypt when we had sw crypto.
729 * Because we use the same flag to internally indicate that
730 * no (software) encryption should be done, we have to set it
731 * after all crypto handlers.
732 */
733 if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
734 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
735
e2ebc74d
JB		 736 return TXRX_CONTINUE;
737}
738
739static ieee80211_txrx_result
740ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
741{
742 struct ieee80211_local *local = tx->local;
743 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
744 struct sk_buff *skb = tx->skb;
745 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
746 u32 load = 0, hdrtime;
747
748 /* TODO: this could be part of tx_status handling, so that the number
749 * of retries would be known; TX rate should in that case be stored
750 * somewhere with the packet */
751
752 /* Estimate total channel use caused by this frame */
753
754 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
755 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
756
757 if (mode->mode == MODE_IEEE80211A ||
e2ebc74d
JB		 758 (mode->mode == MODE_IEEE80211G &&
759 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
760 hdrtime = CHAN_UTIL_HDR_SHORT;
761 else
762 hdrtime = CHAN_UTIL_HDR_LONG;
763
764 load = hdrtime;
765 if (!is_multicast_ether_addr(hdr->addr1))
766 load += hdrtime;
767
768 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
769 load += 2 * hdrtime;
770 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
771 load += hdrtime;
772
773 load += skb->len * tx->u.tx.rate->rate_inv;
774
775 if (tx->u.tx.extra_frag) {
776 int i;
777 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
778 load += 2 * hdrtime;
779 load += tx->u.tx.extra_frag[i]->len *
780 tx->u.tx.rate->rate;
781 }
782 }
783
784 /* Divide channel_use by 8 to avoid wrapping around the counter */
785 load >>= CHAN_UTIL_SHIFT;
786 local->channel_use_raw += load;
787 if (tx->sta)
788 tx->sta->channel_use_raw += load;
789 tx->sdata->channel_use_raw += load;
790
791 return TXRX_CONTINUE;
792}
793
794/* TODO: implement register/unregister functions for adding TX/RX handlers
795 * into ordered list */
796
797ieee80211_tx_handler ieee80211_tx_handlers[] =
798{
799 ieee80211_tx_h_check_assoc,
800 ieee80211_tx_h_sequence,
801 ieee80211_tx_h_ps_buf,
802 ieee80211_tx_h_select_key,
803 ieee80211_tx_h_michael_mic_add,
804 ieee80211_tx_h_fragment,
805 ieee80211_tx_h_tkip_encrypt,
806 ieee80211_tx_h_ccmp_encrypt,
807 ieee80211_tx_h_wep_encrypt,
808 ieee80211_tx_h_rate_ctrl,
809 ieee80211_tx_h_misc,
810 ieee80211_tx_h_load_stats,
811 NULL
812};
813
814/* actual transmit path */
815
816/*
817 * deal with packet injection down monitor interface
818 * with Radiotap Header -- only called for monitor mode interface
819 */
820static ieee80211_txrx_result
821__ieee80211_parse_tx_radiotap(
822 struct ieee80211_txrx_data *tx,
823 struct sk_buff *skb, struct ieee80211_tx_control *control)
824{
825 /*
826 * this is the moment to interpret and discard the radiotap header that
827 * must be at the start of the packet injected in Monitor mode
828 *
829 * Need to take some care with endian-ness since radiotap
830 * args are little-endian
831 */
832
833 struct ieee80211_radiotap_iterator iterator;
834 struct ieee80211_radiotap_header *rthdr =
835 (struct ieee80211_radiotap_header *) skb->data;
836 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
837 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
838
839 /*
840 * default control situation for all injected packets
841 * FIXME: this does not suit all usage cases, expand to allow control
842 */
843
844 control->retry_limit = 1; /* no retry */
e2ebc74d
JB		 845 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
846 IEEE80211_TXCTL_USE_CTS_PROTECT);
847 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
848 IEEE80211_TXCTL_NO_ACK;
849 control->antenna_sel_tx = 0; /* default to default antenna */
850
851 /*
852 * for every radiotap entry that is present
853 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
854 * entries present, or -EINVAL on error)
855 */
856
857 while (!ret) {
858 int i, target_rate;
859
860 ret = ieee80211_radiotap_iterator_next(&iterator);
861
862 if (ret)
863 continue;
864
865 /* see if this argument is something we can use */
866 switch (iterator.this_arg_index) {
867 /*
868 * You must take care when dereferencing iterator.this_arg
869 * for multibyte types... the pointer is not aligned. Use
870 * get_unaligned((type *)iterator.this_arg) to dereference
871 * iterator.this_arg for type "type" safely on all arches.
872 */
873 case IEEE80211_RADIOTAP_RATE:
874 /*
875 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
876 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
877 */
878 target_rate = (*iterator.this_arg) * 5;
879 for (i = 0; i < mode->num_rates; i++) {
880 struct ieee80211_rate *r = &mode->rates[i];
881
882 if (r->rate > target_rate)
883 continue;
884
885 control->rate = r;
886
887 if (r->flags & IEEE80211_RATE_PREAMBLE2)
888 control->tx_rate = r->val2;
889 else
890 control->tx_rate = r->val;
891
892 /* end on exact match */
893 if (r->rate == target_rate)
894 i = mode->num_rates;
895 }
896 break;
897
898 case IEEE80211_RADIOTAP_ANTENNA:
899 /*
900 * radiotap uses 0 for 1st ant, mac80211 is 1 for
901 * 1st ant
902 */
903 control->antenna_sel_tx = (*iterator.this_arg) + 1;
904 break;
905
906 case IEEE80211_RADIOTAP_DBM_TX_POWER:
907 control->power_level = *iterator.this_arg;
908 break;
909
910 case IEEE80211_RADIOTAP_FLAGS:
911 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
912 /*
913 * this indicates that the skb we have been
914 * handed has the 32-bit FCS CRC at the end...
915 * we should react to that by snipping it off
916 * because it will be recomputed and added
917 * on transmission
918 */
919 if (skb->len < (iterator.max_length + FCS_LEN))
920 return TXRX_DROP;
921
922 skb_trim(skb, skb->len - FCS_LEN);
923 }
924 break;
925
926 default:
927 break;
928 }
929 }
930
931 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
932 return TXRX_DROP;
933
934 /*
935 * remove the radiotap header
936 * iterator->max_length was sanity-checked against
937 * skb->len by iterator init
938 */
939 skb_pull(skb, iterator.max_length);
940
941 return TXRX_CONTINUE;
942}
943
944static ieee80211_txrx_result inline
945__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
946 struct sk_buff *skb,
947 struct net_device *dev,
948 struct ieee80211_tx_control *control)
949{
950 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
951 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
952 struct ieee80211_sub_if_data *sdata;
953 ieee80211_txrx_result res = TXRX_CONTINUE;
954
955 int hdrlen;
956
957 memset(tx, 0, sizeof(*tx));
958 tx->skb = skb;
959 tx->dev = dev; /* use original interface */
960 tx->local = local;
961 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
962 tx->sta = sta_info_get(local, hdr->addr1);
963 tx->fc = le16_to_cpu(hdr->frame_control);
964
965 /*
966 * set defaults for things that can be set by
967 * injected radiotap headers
968 */
969 control->power_level = local->hw.conf.power_level;
970 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
e2ebc74d
JB		 971
972 /* process and remove the injection radiotap header */
973 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
974 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
975 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
976 TXRX_DROP) {
977 return TXRX_DROP;
978 }
979 /*
980 * we removed the radiotap header after this point,
981 * we filled control with what we could use
982 * set to the actual ieee header now
983 */
984 hdr = (struct ieee80211_hdr *) skb->data;
985 res = TXRX_QUEUED; /* indication it was monitor packet */
986 }
987
988 tx->u.tx.control = control;
badffb72
JS		 989 if (is_multicast_ether_addr(hdr->addr1)) {
990 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 991 control->flags |= IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 992 } else {
993 tx->flags |= IEEE80211_TXRXD_TXUNICAST;
e2ebc74d 994 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
badffb72
JS		 995 }
996 if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD &&
997 (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
998 skb->len + FCS_LEN > local->fragmentation_threshold &&
999 !local->ops->set_frag_threshold)
1000 tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
1001 else
1002 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
e2ebc74d
JB		 1003 if (!tx->sta)
1004 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1005 else if (tx->sta->clear_dst_mask) {
1006 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1007 tx->sta->clear_dst_mask = 0;
1008 }
1009 hdrlen = ieee80211_get_hdrlen(tx->fc);
1010 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1011 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1012 tx->ethertype = (pos[0] << 8) | pos[1];
1013 }
1014 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1015
1016 return res;
1017}
1018
1019/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1020 * finished with it. */
1021static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1022 struct sk_buff *skb,
1023 struct net_device *mdev,
1024 struct ieee80211_tx_control *control)
1025{
1026 struct ieee80211_tx_packet_data *pkt_data;
1027 struct net_device *dev;
1028
1029 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
881d966b 1030 dev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 1031 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1032 dev_put(dev);
1033 dev = NULL;
1034 }
1035 if (unlikely(!dev))
1036 return -ENODEV;
1037 __ieee80211_tx_prepare(tx, skb, dev, control);
1038 return 0;
1039}
1040
1041static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1042 struct ieee80211_txrx_data *tx)
1043{
1044 struct ieee80211_tx_control *control = tx->u.tx.control;
1045 int ret, i;
1046
1047 if (!ieee80211_qdisc_installed(local->mdev) &&
1048 __ieee80211_queue_stopped(local, 0)) {
1049 netif_stop_queue(local->mdev);
1050 return IEEE80211_TX_AGAIN;
1051 }
1052 if (skb) {
1053 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1054 ret = local->ops->tx(local_to_hw(local), skb, control);
1055 if (ret)
1056 return IEEE80211_TX_AGAIN;
1057 local->mdev->trans_start = jiffies;
1058 ieee80211_led_tx(local, 1);
1059 }
1060 if (tx->u.tx.extra_frag) {
1061 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1062 IEEE80211_TXCTL_USE_CTS_PROTECT |
1063 IEEE80211_TXCTL_CLEAR_DST_MASK |
1064 IEEE80211_TXCTL_FIRST_FRAGMENT);
1065 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1066 if (!tx->u.tx.extra_frag[i])
1067 continue;
1068 if (__ieee80211_queue_stopped(local, control->queue))
1069 return IEEE80211_TX_FRAG_AGAIN;
1070 if (i == tx->u.tx.num_extra_frag) {
1071 control->tx_rate = tx->u.tx.last_frag_hwrate;
1072 control->rate = tx->u.tx.last_frag_rate;
badffb72 1073 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
e2ebc74d
JB		 1074 control->flags |=
1075 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1076 else
1077 control->flags &=
1078 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1079 }
1080
1081 ieee80211_dump_frame(local->mdev->name,
1082 "TX to low-level driver",
1083 tx->u.tx.extra_frag[i]);
1084 ret = local->ops->tx(local_to_hw(local),
1085 tx->u.tx.extra_frag[i],
1086 control);
1087 if (ret)
1088 return IEEE80211_TX_FRAG_AGAIN;
1089 local->mdev->trans_start = jiffies;
1090 ieee80211_led_tx(local, 1);
1091 tx->u.tx.extra_frag[i] = NULL;
1092 }
1093 kfree(tx->u.tx.extra_frag);
1094 tx->u.tx.extra_frag = NULL;
1095 }
1096 return IEEE80211_TX_OK;
1097}
1098
1099static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1100 struct ieee80211_tx_control *control, int mgmt)
1101{
1102 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1103 struct sta_info *sta;
1104 ieee80211_tx_handler *handler;
1105 struct ieee80211_txrx_data tx;
1106 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1107 int ret, i;
1108
1109 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1110
1111 if (unlikely(skb->len < 10)) {
1112 dev_kfree_skb(skb);
1113 return 0;
1114 }
1115
1116 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1117
1118 if (res_prepare == TXRX_DROP) {
1119 dev_kfree_skb(skb);
1120 return 0;
1121 }
1122
d4e46a3d
JB		 1123 /*
1124 * key references are protected using RCU and this requires that
1125 * we are in a read-site RCU section during receive processing
1126 */
1127 rcu_read_lock();
1128
e2ebc74d
JB		 1129 sta = tx.sta;
1130 tx.u.tx.mgmt_interface = mgmt;
1131 tx.u.tx.mode = local->hw.conf.mode;
1132
1133 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1134 res = TXRX_CONTINUE;
1135 } else {
1136 for (handler = local->tx_handlers; *handler != NULL;
1137 handler++) {
1138 res = (*handler)(&tx);
1139 if (res != TXRX_CONTINUE)
1140 break;
1141 }
1142 }
1143
1144 skb = tx.skb; /* handlers are allowed to change skb */
1145
1146 if (sta)
1147 sta_info_put(sta);
1148
1149 if (unlikely(res == TXRX_DROP)) {
1150 I802_DEBUG_INC(local->tx_handlers_drop);
1151 goto drop;
1152 }
1153
1154 if (unlikely(res == TXRX_QUEUED)) {
1155 I802_DEBUG_INC(local->tx_handlers_queued);
d4e46a3d 1156 rcu_read_unlock();
e2ebc74d
JB		 1157 return 0;
1158 }
1159
1160 if (tx.u.tx.extra_frag) {
1161 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1162 int next_len, dur;
1163 struct ieee80211_hdr *hdr =
1164 (struct ieee80211_hdr *)
1165 tx.u.tx.extra_frag[i]->data;
1166
1167 if (i + 1 < tx.u.tx.num_extra_frag) {
1168 next_len = tx.u.tx.extra_frag[i + 1]->len;
1169 } else {
1170 next_len = 0;
1171 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1172 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1173 }
1174 dur = ieee80211_duration(&tx, 0, next_len);
1175 hdr->duration_id = cpu_to_le16(dur);
1176 }
1177 }
1178
1179retry:
1180 ret = __ieee80211_tx(local, skb, &tx);
1181 if (ret) {
1182 struct ieee80211_tx_stored_packet *store =
1183 &local->pending_packet[control->queue];
1184
1185 if (ret == IEEE80211_TX_FRAG_AGAIN)
1186 skb = NULL;
1187 set_bit(IEEE80211_LINK_STATE_PENDING,
1188 &local->state[control->queue]);
1189 smp_mb();
1190 /* When the driver gets out of buffers during sending of
1191 * fragments and calls ieee80211_stop_queue, there is
1192 * a small window between IEEE80211_LINK_STATE_XOFF and
1193 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1194 * gets available in that window (i.e. driver calls
1195 * ieee80211_wake_queue), we would end up with ieee80211_tx
1196 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1197 * continuing transmitting here when that situation is
1198 * possible to have happened. */
1199 if (!__ieee80211_queue_stopped(local, control->queue)) {
1200 clear_bit(IEEE80211_LINK_STATE_PENDING,
1201 &local->state[control->queue]);
1202 goto retry;
1203 }
1204 memcpy(&store->control, control,
1205 sizeof(struct ieee80211_tx_control));
1206 store->skb = skb;
1207 store->extra_frag = tx.u.tx.extra_frag;
1208 store->num_extra_frag = tx.u.tx.num_extra_frag;
1209 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1210 store->last_frag_rate = tx.u.tx.last_frag_rate;
badffb72
JS		 1211 store->last_frag_rate_ctrl_probe =
1212 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
e2ebc74d 1213 }
d4e46a3d 1214 rcu_read_unlock();
e2ebc74d
JB		 1215 return 0;
1216
1217 drop:
1218 if (skb)
1219 dev_kfree_skb(skb);
1220 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1221 if (tx.u.tx.extra_frag[i])
1222 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1223 kfree(tx.u.tx.extra_frag);
d4e46a3d 1224 rcu_read_unlock();
e2ebc74d
JB		 1225 return 0;
1226}
1227
1228/* device xmit handlers */
1229
1230int ieee80211_master_start_xmit(struct sk_buff *skb,
1231 struct net_device *dev)
1232{
1233 struct ieee80211_tx_control control;
1234 struct ieee80211_tx_packet_data *pkt_data;
1235 struct net_device *odev = NULL;
1236 struct ieee80211_sub_if_data *osdata;
1237 int headroom;
1238 int ret;
1239
1240 /*
1241 * copy control out of the skb so other people can use skb->cb
1242 */
1243 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1244 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1245
1246 if (pkt_data->ifindex)
881d966b 1247 odev = dev_get_by_index(&init_net, pkt_data->ifindex);
e2ebc74d
JB		 1248 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1249 dev_put(odev);
1250 odev = NULL;
1251 }
1252 if (unlikely(!odev)) {
1253#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1254 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1255 "originating device\n", dev->name);
1256#endif
1257 dev_kfree_skb(skb);
1258 return 0;
1259 }
1260 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1261
1262 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1263 if (skb_headroom(skb) < headroom) {
1264 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1265 dev_kfree_skb(skb);
1266 dev_put(odev);
1267 return 0;
1268 }
1269 }
1270
1271 control.ifindex = odev->ifindex;
1272 control.type = osdata->type;
e8bf9649 1273 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
e2ebc74d 1274 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
e8bf9649 1275 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
e2ebc74d 1276 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
e8bf9649 1277 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
e2ebc74d
JB		 1278 control.flags |= IEEE80211_TXCTL_REQUEUE;
1279 control.queue = pkt_data->queue;
1280
1281 ret = ieee80211_tx(odev, skb, &control,
1282 control.type == IEEE80211_IF_TYPE_MGMT);
1283 dev_put(odev);
1284
1285 return ret;
1286}
1287
1288int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1289 struct net_device *dev)
1290{
1291 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1292 struct ieee80211_tx_packet_data *pkt_data;
1293 struct ieee80211_radiotap_header *prthdr =
1294 (struct ieee80211_radiotap_header *)skb->data;
9b8a74e3 1295 u16 len_rthdr;
e2ebc74d 1296
9b8a74e3
AG		 1297 /* check for not even having the fixed radiotap header part */
1298 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1299 goto fail; /* too short to be possibly valid */
1300
1301 /* is it a header version we can trust to find length from? */
1302 if (unlikely(prthdr->it_version))
1303 goto fail; /* only version 0 is supported */
1304
1305 /* then there must be a radiotap header with a length we can use */
1306 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1307
1308 /* does the skb contain enough to deliver on the alleged length? */
1309 if (unlikely(skb->len < len_rthdr))
1310 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d
JB		 1311
1312 skb->dev = local->mdev;
1313
1314 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1315 memset(pkt_data, 0, sizeof(*pkt_data));
9b8a74e3 1316 /* needed because we set skb device to master */
e2ebc74d 1317 pkt_data->ifindex = dev->ifindex;
9b8a74e3 1318
e8bf9649 1319 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d 1320
e2ebc74d
JB		 1321 /*
1322 * fix up the pointers accounting for the radiotap
1323 * header still being in there. We are being given
1324 * a precooked IEEE80211 header so no need for
1325 * normal processing
1326 */
9b8a74e3 1327 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1328 /*
9b8a74e3
AG		 1329 * these are just fixed to the end of the rt area since we
1330 * don't have any better information and at this point, nobody cares
e2ebc74d 1331 */
9b8a74e3
AG		 1332 skb_set_network_header(skb, len_rthdr);
1333 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1334
9b8a74e3
AG		 1335 /* pass the radiotap header up to the next stage intact */
1336 dev_queue_xmit(skb);
e2ebc74d 1337 return NETDEV_TX_OK;
9b8a74e3
AG		 1338
1339fail:
1340 dev_kfree_skb(skb);
1341 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1342}
1343
1344/**
1345 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1346 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1347 * @skb: packet to be sent
1348 * @dev: incoming interface
1349 *
1350 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1351 * not be freed, and caller is responsible for either retrying later or freeing
1352 * skb).
1353 *
1354 * This function takes in an Ethernet header and encapsulates it with suitable
1355 * IEEE 802.11 header based on which interface the packet is coming in. The
1356 * encapsulated packet will then be passed to master interface, wlan#.11, for
1357 * transmission (through low-level driver).
1358 */
1359int ieee80211_subif_start_xmit(struct sk_buff *skb,
1360 struct net_device *dev)
1361{
1362 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1363 struct ieee80211_tx_packet_data *pkt_data;
1364 struct ieee80211_sub_if_data *sdata;
1365 int ret = 1, head_need;
1366 u16 ethertype, hdrlen, fc;
1367 struct ieee80211_hdr hdr;
1368 const u8 *encaps_data;
1369 int encaps_len, skip_header_bytes;
e8bf9649 1370 int nh_pos, h_pos;
e2ebc74d
JB		 1371 struct sta_info *sta;
1372
1373 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1374 if (unlikely(skb->len < ETH_HLEN)) {
1375 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1376 dev->name, skb->len);
1377 ret = 0;
1378 goto fail;
1379 }
1380
1381 nh_pos = skb_network_header(skb) - skb->data;
1382 h_pos = skb_transport_header(skb) - skb->data;
1383
1384 /* convert Ethernet header to proper 802.11 header (based on
1385 * operation mode) */
1386 ethertype = (skb->data[12] << 8) | skb->data[13];
1387 /* TODO: handling for 802.1x authorized/unauthorized port */
1388 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1389
cf966838
JB		 1390 switch (sdata->type) {
1391 case IEEE80211_IF_TYPE_AP:
1392 case IEEE80211_IF_TYPE_VLAN:
e2ebc74d
JB		 1393 fc |= IEEE80211_FCTL_FROMDS;
1394 /* DA BSSID SA */
1395 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1396 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1397 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1398 hdrlen = 24;
cf966838
JB		 1399 break;
1400 case IEEE80211_IF_TYPE_WDS:
e2ebc74d
JB		 1401 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1402 /* RA TA DA SA */
1403 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1404 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1405 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1406 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1407 hdrlen = 30;
cf966838
JB		 1408 break;
1409 case IEEE80211_IF_TYPE_STA:
e2ebc74d
JB		 1410 fc |= IEEE80211_FCTL_TODS;
1411 /* BSSID SA DA */
1412 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1413 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1414 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1415 hdrlen = 24;
cf966838
JB		 1416 break;
1417 case IEEE80211_IF_TYPE_IBSS:
e2ebc74d
JB		 1418 /* DA SA BSSID */
1419 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1420 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1421 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1422 hdrlen = 24;
cf966838
JB		 1423 break;
1424 default:
e2ebc74d
JB		 1425 ret = 0;
1426 goto fail;
1427 }
1428
1429 /* receiver is QoS enabled, use a QoS type frame */
1430 sta = sta_info_get(local, hdr.addr1);
1431 if (sta) {
1432 if (sta->flags & WLAN_STA_WME) {
1433 fc |= IEEE80211_STYPE_QOS_DATA;
1434 hdrlen += 2;
1435 }
1436 sta_info_put(sta);
1437 }
1438
1439 hdr.frame_control = cpu_to_le16(fc);
1440 hdr.duration_id = 0;
1441 hdr.seq_ctrl = 0;
1442
1443 skip_header_bytes = ETH_HLEN;
1444 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1445 encaps_data = bridge_tunnel_header;
1446 encaps_len = sizeof(bridge_tunnel_header);
1447 skip_header_bytes -= 2;
1448 } else if (ethertype >= 0x600) {
1449 encaps_data = rfc1042_header;
1450 encaps_len = sizeof(rfc1042_header);
1451 skip_header_bytes -= 2;
1452 } else {
1453 encaps_data = NULL;
1454 encaps_len = 0;
1455 }
1456
1457 skb_pull(skb, skip_header_bytes);
1458 nh_pos -= skip_header_bytes;
1459 h_pos -= skip_header_bytes;
1460
1461 /* TODO: implement support for fragments so that there is no need to
1462 * reallocate and copy payload; it might be enough to support one
1463 * extra fragment that would be copied in the beginning of the frame
1464 * data.. anyway, it would be nice to include this into skb structure
1465 * somehow
1466 *
1467 * There are few options for this:
1468 * use skb->cb as an extra space for 802.11 header
1469 * allocate new buffer if not enough headroom
1470 * make sure that there is enough headroom in every skb by increasing
1471 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1472 * alloc_skb() (net/core/skbuff.c)
1473 */
1474 head_need = hdrlen + encaps_len + local->tx_headroom;
1475 head_need -= skb_headroom(skb);
1476
1477 /* We are going to modify skb data, so make a copy of it if happens to
1478 * be cloned. This could happen, e.g., with Linux bridge code passing
1479 * us broadcast frames. */
1480
1481 if (head_need > 0 || skb_cloned(skb)) {
1482#if 0
1483 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1484 "of headroom\n", dev->name, head_need);
1485#endif
1486
1487 if (skb_cloned(skb))
1488 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1489 else
1490 I802_DEBUG_INC(local->tx_expand_skb_head);
1491 /* Since we have to reallocate the buffer, make sure that there
1492 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1493 * before payload and 12 after). */
1494 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1495 12, GFP_ATOMIC)) {
1496 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1497 "\n", dev->name);
1498 goto fail;
1499 }
1500 }
1501
1502 if (encaps_data) {
1503 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1504 nh_pos += encaps_len;
1505 h_pos += encaps_len;
1506 }
c29b9b9b
JB		 1507
1508 if (fc & IEEE80211_STYPE_QOS_DATA) {
1509 __le16 *qos_control;
1510
1511 qos_control = (__le16*) skb_push(skb, 2);
1512 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1513 /*
1514 * Maybe we could actually set some fields here, for now just
1515 * initialise to zero to indicate no special operation.
1516 */
1517 *qos_control = 0;
1518 } else
1519 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1520
e2ebc74d
JB		 1521 nh_pos += hdrlen;
1522 h_pos += hdrlen;
1523
1524 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1525 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1526 pkt_data->ifindex = dev->ifindex;
e8bf9649
JS		 1527 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1528 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
e2ebc74d
JB		 1529
1530 skb->dev = local->mdev;
1531 sdata->stats.tx_packets++;
1532 sdata->stats.tx_bytes += skb->len;
1533
1534 /* Update skb pointers to various headers since this modified frame
1535 * is going to go through Linux networking code that may potentially
1536 * need things like pointer to IP header. */
1537 skb_set_mac_header(skb, 0);
1538 skb_set_network_header(skb, nh_pos);
1539 skb_set_transport_header(skb, h_pos);
1540
1541 dev->trans_start = jiffies;
1542 dev_queue_xmit(skb);
1543
1544 return 0;
1545
1546 fail:
1547 if (!ret)
1548 dev_kfree_skb(skb);
1549
1550 return ret;
1551}
1552
1553/*
1554 * This is the transmit routine for the 802.11 type interfaces
1555 * called by upper layers of the linux networking
1556 * stack when it has a frame to transmit
1557 */
1558int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1559{
1560 struct ieee80211_sub_if_data *sdata;
1561 struct ieee80211_tx_packet_data *pkt_data;
1562 struct ieee80211_hdr *hdr;
1563 u16 fc;
1564
1565 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1566
1567 if (skb->len < 10) {
1568 dev_kfree_skb(skb);
1569 return 0;
1570 }
1571
1572 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1573 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1574 0, GFP_ATOMIC)) {
1575 dev_kfree_skb(skb);
1576 return 0;
1577 }
1578 }
1579
1580 hdr = (struct ieee80211_hdr *) skb->data;
1581 fc = le16_to_cpu(hdr->frame_control);
1582
1583 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1584 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1585 pkt_data->ifindex = sdata->dev->ifindex;
e8bf9649
JS		 1586 if (sdata->type == IEEE80211_IF_TYPE_MGMT)
1587 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
e2ebc74d
JB		 1588
1589 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1590 skb->dev = sdata->local->mdev;
1591
1592 /*
1593 * We're using the protocol field of the the frame control header
1594 * to request TX callback for hostapd. BIT(1) is checked.
1595 */
1596 if ((fc & BIT(1)) == BIT(1)) {
e8bf9649 1597 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
e2ebc74d
JB		 1598 fc &= ~BIT(1);
1599 hdr->frame_control = cpu_to_le16(fc);
1600 }
1601
e8bf9649
JS		 1602 if (!(fc & IEEE80211_FCTL_PROTECTED))
1603 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
e2ebc74d
JB		 1604
1605 sdata->stats.tx_packets++;
1606 sdata->stats.tx_bytes += skb->len;
1607
1608 dev_queue_xmit(skb);
1609
1610 return 0;
1611}
1612
1613/* helper functions for pending packets for when queues are stopped */
1614
1615void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1616{
1617 int i, j;
1618 struct ieee80211_tx_stored_packet *store;
1619
1620 for (i = 0; i < local->hw.queues; i++) {
1621 if (!__ieee80211_queue_pending(local, i))
1622 continue;
1623 store = &local->pending_packet[i];
1624 kfree_skb(store->skb);
1625 for (j = 0; j < store->num_extra_frag; j++)
1626 kfree_skb(store->extra_frag[j]);
1627 kfree(store->extra_frag);
1628 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1629 }
1630}
1631
1632void ieee80211_tx_pending(unsigned long data)
1633{
1634 struct ieee80211_local *local = (struct ieee80211_local *)data;
1635 struct net_device *dev = local->mdev;
1636 struct ieee80211_tx_stored_packet *store;
1637 struct ieee80211_txrx_data tx;
1638 int i, ret, reschedule = 0;
1639
1640 netif_tx_lock_bh(dev);
1641 for (i = 0; i < local->hw.queues; i++) {
1642 if (__ieee80211_queue_stopped(local, i))
1643 continue;
1644 if (!__ieee80211_queue_pending(local, i)) {
1645 reschedule = 1;
1646 continue;
1647 }
1648 store = &local->pending_packet[i];
1649 tx.u.tx.control = &store->control;
1650 tx.u.tx.extra_frag = store->extra_frag;
1651 tx.u.tx.num_extra_frag = store->num_extra_frag;
1652 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1653 tx.u.tx.last_frag_rate = store->last_frag_rate;
badffb72
JS		 1654 tx.flags = 0;
1655 if (store->last_frag_rate_ctrl_probe)
1656 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
e2ebc74d
JB		 1657 ret = __ieee80211_tx(local, store->skb, &tx);
1658 if (ret) {
1659 if (ret == IEEE80211_TX_FRAG_AGAIN)
1660 store->skb = NULL;
1661 } else {
1662 clear_bit(IEEE80211_LINK_STATE_PENDING,
1663 &local->state[i]);
1664 reschedule = 1;
1665 }
1666 }
1667 netif_tx_unlock_bh(dev);
1668 if (reschedule) {
1669 if (!ieee80211_qdisc_installed(dev)) {
1670 if (!__ieee80211_queue_stopped(local, 0))
1671 netif_wake_queue(dev);
1672 } else
1673 netif_schedule(dev);
1674 }
1675}
1676
1677/* functions for drivers to get certain frames */
1678
1679static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1680 struct ieee80211_if_ap *bss,
1681 struct sk_buff *skb)
1682{
1683 u8 *pos, *tim;
1684 int aid0 = 0;
1685 int i, have_bits = 0, n1, n2;
1686
1687 /* Generate bitmap for TIM only if there are any STAs in power save
1688 * mode. */
be8755e1 1689 read_lock_bh(&local->sta_lock);
e2ebc74d
JB		 1690 if (atomic_read(&bss->num_sta_ps) > 0)
1691 /* in the hope that this is faster than
1692 * checking byte-for-byte */
1693 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1694 IEEE80211_MAX_AID+1);
1695
1696 if (bss->dtim_count == 0)
1697 bss->dtim_count = bss->dtim_period - 1;
1698 else
1699 bss->dtim_count--;
1700
1701 tim = pos = (u8 *) skb_put(skb, 6);
1702 *pos++ = WLAN_EID_TIM;
1703 *pos++ = 4;
1704 *pos++ = bss->dtim_count;
1705 *pos++ = bss->dtim_period;
1706
1707 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1708 aid0 = 1;
1709
1710 if (have_bits) {
1711 /* Find largest even number N1 so that bits numbered 1 through
1712 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1713 * (N2 + 1) x 8 through 2007 are 0. */
1714 n1 = 0;
1715 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1716 if (bss->tim[i]) {
1717 n1 = i & 0xfe;
1718 break;
1719 }
1720 }
1721 n2 = n1;
1722 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1723 if (bss->tim[i]) {
1724 n2 = i;
1725 break;
1726 }
1727 }
1728
1729 /* Bitmap control */
1730 *pos++ = n1 | aid0;
1731 /* Part Virt Bitmap */
1732 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1733
1734 tim[1] = n2 - n1 + 4;
1735 skb_put(skb, n2 - n1);
1736 } else {
1737 *pos++ = aid0; /* Bitmap control */
1738 *pos++ = 0; /* Part Virt Bitmap */
1739 }
be8755e1 1740 read_unlock_bh(&local->sta_lock);
e2ebc74d
JB		 1741}
1742
1743struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1744 struct ieee80211_tx_control *control)
1745{
1746 struct ieee80211_local *local = hw_to_local(hw);
1747 struct sk_buff *skb;
1748 struct net_device *bdev;
1749 struct ieee80211_sub_if_data *sdata = NULL;
1750 struct ieee80211_if_ap *ap = NULL;
1751 struct ieee80211_rate *rate;
1752 struct rate_control_extra extra;
1753 u8 *b_head, *b_tail;
1754 int bh_len, bt_len;
1755
881d966b 1756 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1757 if (bdev) {
1758 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1759 ap = &sdata->u.ap;
1760 dev_put(bdev);
1761 }
1762
1763 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1764 !ap->beacon_head) {
1765#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1766 if (net_ratelimit())
1767 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1768 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1769#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1770 return NULL;
1771 }
1772
1773 /* Assume we are generating the normal beacon locally */
1774 b_head = ap->beacon_head;
1775 b_tail = ap->beacon_tail;
1776 bh_len = ap->beacon_head_len;
1777 bt_len = ap->beacon_tail_len;
1778
1779 skb = dev_alloc_skb(local->tx_headroom +
1780 bh_len + bt_len + 256 /* maximum TIM len */);
1781 if (!skb)
1782 return NULL;
1783
1784 skb_reserve(skb, local->tx_headroom);
1785 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1786
1787 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1788
1789 ieee80211_beacon_add_tim(local, ap, skb);
1790
1791 if (b_tail) {
1792 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1793 }
1794
1795 if (control) {
1796 memset(&extra, 0, sizeof(extra));
1797 extra.mode = local->oper_hw_mode;
1798
1799 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1800 if (!rate) {
1801 if (net_ratelimit()) {
1802 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1803 "found\n", local->mdev->name);
1804 }
1805 dev_kfree_skb(skb);
1806 return NULL;
1807 }
1808
13262ffd
JS		 1809 control->tx_rate =
1810 ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
1811 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
e2ebc74d
JB		 1812 rate->val2 : rate->val;
1813 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1814 control->power_level = local->hw.conf.power_level;
1815 control->flags |= IEEE80211_TXCTL_NO_ACK;
1816 control->retry_limit = 1;
1817 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1818 }
1819
1820 ap->num_beacons++;
1821 return skb;
1822}
1823EXPORT_SYMBOL(ieee80211_beacon_get);
1824
7e9ed188 1825void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1826 const void *frame, size_t frame_len,
1827 const struct ieee80211_tx_control *frame_txctl,
1828 struct ieee80211_rts *rts)
1829{
1830 const struct ieee80211_hdr *hdr = frame;
1831 u16 fctl;
1832
1833 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1834 rts->frame_control = cpu_to_le16(fctl);
7e9ed188 1835 rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1836 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1837 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1838}
1839EXPORT_SYMBOL(ieee80211_rts_get);
1840
7e9ed188 1841void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
e2ebc74d
JB		 1842 const void *frame, size_t frame_len,
1843 const struct ieee80211_tx_control *frame_txctl,
1844 struct ieee80211_cts *cts)
1845{
1846 const struct ieee80211_hdr *hdr = frame;
1847 u16 fctl;
1848
1849 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1850 cts->frame_control = cpu_to_le16(fctl);
7e9ed188 1851 cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
e2ebc74d
JB		 1852 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1853}
1854EXPORT_SYMBOL(ieee80211_ctstoself_get);
1855
1856struct sk_buff *
1857ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1858 struct ieee80211_tx_control *control)
1859{
1860 struct ieee80211_local *local = hw_to_local(hw);
1861 struct sk_buff *skb;
1862 struct sta_info *sta;
1863 ieee80211_tx_handler *handler;
1864 struct ieee80211_txrx_data tx;
1865 ieee80211_txrx_result res = TXRX_DROP;
1866 struct net_device *bdev;
1867 struct ieee80211_sub_if_data *sdata;
1868 struct ieee80211_if_ap *bss = NULL;
1869
881d966b 1870 bdev = dev_get_by_index(&init_net, if_id);
e2ebc74d
JB		 1871 if (bdev) {
1872 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1873 bss = &sdata->u.ap;
1874 dev_put(bdev);
1875 }
1876 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1877 return NULL;
1878
1879 if (bss->dtim_count != 0)
1880 return NULL; /* send buffered bc/mc only after DTIM beacon */
1881 memset(control, 0, sizeof(*control));
1882 while (1) {
1883 skb = skb_dequeue(&bss->ps_bc_buf);
1884 if (!skb)
1885 return NULL;
1886 local->total_ps_buffered--;
1887
1888 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
1889 struct ieee80211_hdr *hdr =
1890 (struct ieee80211_hdr *) skb->data;
1891 /* more buffered multicast/broadcast frames ==> set
1892 * MoreData flag in IEEE 802.11 header to inform PS
1893 * STAs */
1894 hdr->frame_control |=
1895 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1896 }
1897
1898 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
1899 break;
1900 dev_kfree_skb_any(skb);
1901 }
1902 sta = tx.sta;
badffb72 1903 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
e2ebc74d
JB		 1904
1905 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1906 res = (*handler)(&tx);
1907 if (res == TXRX_DROP || res == TXRX_QUEUED)
1908 break;
1909 }
1910 dev_put(tx.dev);
1911 skb = tx.skb; /* handlers are allowed to change skb */
1912
1913 if (res == TXRX_DROP) {
1914 I802_DEBUG_INC(local->tx_handlers_drop);
1915 dev_kfree_skb(skb);
1916 skb = NULL;
1917 } else if (res == TXRX_QUEUED) {
1918 I802_DEBUG_INC(local->tx_handlers_queued);
1919 skb = NULL;
1920 }
1921
1922 if (sta)
1923 sta_info_put(sta);
1924
1925 return skb;
1926}
1927EXPORT_SYMBOL(ieee80211_get_buffered_bc);
Linux kernel - Deliverables
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