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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 "driver-ops.h" |
29 | #include "led.h" |
30 | #include "mesh.h" |
31 | #include "wep.h" |
32 | #include "wpa.h" |
33 | #include "wme.h" |
34 | #include "rate.h" |
35 | |
36 | #define IEEE80211_TX_OK 0 |
37 | #define IEEE80211_TX_AGAIN 1 |
38 | #define IEEE80211_TX_PENDING 2 |
39 | |
40 | /* misc utils */ |
41 | |
42 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
43 | int next_frag_len) |
44 | { |
45 | int rate, mrate, erp, dur, i; |
46 | struct ieee80211_rate *txrate; |
47 | struct ieee80211_local *local = tx->local; |
48 | struct ieee80211_supported_band *sband; |
49 | struct ieee80211_hdr *hdr; |
50 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
51 | |
52 | /* assume HW handles this */ |
53 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) |
54 | return 0; |
55 | |
56 | /* uh huh? */ |
57 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) |
58 | return 0; |
59 | |
60 | sband = local->hw.wiphy->bands[tx->channel->band]; |
61 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
62 | |
63 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
64 | |
65 | /* |
66 | * data and mgmt (except PS Poll): |
67 | * - during CFP: 32768 |
68 | * - during contention period: |
69 | * if addr1 is group address: 0 |
70 | * if more fragments = 0 and addr1 is individual address: time to |
71 | * transmit one ACK plus SIFS |
72 | * if more fragments = 1 and addr1 is individual address: time to |
73 | * transmit next fragment plus 2 x ACK plus 3 x SIFS |
74 | * |
75 | * IEEE 802.11, 9.6: |
76 | * - control response frame (CTS or ACK) shall be transmitted using the |
77 | * same rate as the immediately previous frame in the frame exchange |
78 | * sequence, if this rate belongs to the PHY mandatory rates, or else |
79 | * at the highest possible rate belonging to the PHY rates in the |
80 | * BSSBasicRateSet |
81 | */ |
82 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
83 | if (ieee80211_is_ctl(hdr->frame_control)) { |
84 | /* TODO: These control frames are not currently sent by |
85 | * mac80211, but should they be implemented, this function |
86 | * needs to be updated to support duration field calculation. |
87 | * |
88 | * RTS: time needed to transmit pending data/mgmt frame plus |
89 | * one CTS frame plus one ACK frame plus 3 x SIFS |
90 | * CTS: duration of immediately previous RTS minus time |
91 | * required to transmit CTS and its SIFS |
92 | * ACK: 0 if immediately previous directed data/mgmt had |
93 | * more=0, with more=1 duration in ACK frame is duration |
94 | * from previous frame minus time needed to transmit ACK |
95 | * and its SIFS |
96 | * PS Poll: BIT(15) | BIT(14) | aid |
97 | */ |
98 | return 0; |
99 | } |
100 | |
101 | /* data/mgmt */ |
102 | if (0 /* FIX: data/mgmt during CFP */) |
103 | return cpu_to_le16(32768); |
104 | |
105 | if (group_addr) /* Group address as the destination - no ACK */ |
106 | return 0; |
107 | |
108 | /* Individual destination address: |
109 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) |
110 | * CTS and ACK frames shall be transmitted using the highest rate in |
111 | * basic rate set that is less than or equal to the rate of the |
112 | * immediately previous frame and that is using the same modulation |
113 | * (CCK or OFDM). If no basic rate set matches with these requirements, |
114 | * the highest mandatory rate of the PHY that is less than or equal to |
115 | * the rate of the previous frame is used. |
116 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps |
117 | */ |
118 | rate = -1; |
119 | /* use lowest available if everything fails */ |
120 | mrate = sband->bitrates[0].bitrate; |
121 | for (i = 0; i < sband->n_bitrates; i++) { |
122 | struct ieee80211_rate *r = &sband->bitrates[i]; |
123 | |
124 | if (r->bitrate > txrate->bitrate) |
125 | break; |
126 | |
127 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
128 | rate = r->bitrate; |
129 | |
130 | switch (sband->band) { |
131 | case IEEE80211_BAND_2GHZ: { |
132 | u32 flag; |
133 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) |
134 | flag = IEEE80211_RATE_MANDATORY_G; |
135 | else |
136 | flag = IEEE80211_RATE_MANDATORY_B; |
137 | if (r->flags & flag) |
138 | mrate = r->bitrate; |
139 | break; |
140 | } |
141 | case IEEE80211_BAND_5GHZ: |
142 | if (r->flags & IEEE80211_RATE_MANDATORY_A) |
143 | mrate = r->bitrate; |
144 | break; |
145 | case IEEE80211_NUM_BANDS: |
146 | WARN_ON(1); |
147 | break; |
148 | } |
149 | } |
150 | if (rate == -1) { |
151 | /* No matching basic rate found; use highest suitable mandatory |
152 | * PHY rate */ |
153 | rate = mrate; |
154 | } |
155 | |
156 | /* Time needed to transmit ACK |
157 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up |
158 | * to closest integer */ |
159 | |
160 | dur = ieee80211_frame_duration(local, 10, rate, erp, |
161 | tx->sdata->vif.bss_conf.use_short_preamble); |
162 | |
163 | if (next_frag_len) { |
164 | /* Frame is fragmented: duration increases with time needed to |
165 | * transmit next fragment plus ACK and 2 x SIFS. */ |
166 | dur *= 2; /* ACK + SIFS */ |
167 | /* next fragment */ |
168 | dur += ieee80211_frame_duration(local, next_frag_len, |
169 | txrate->bitrate, erp, |
170 | tx->sdata->vif.bss_conf.use_short_preamble); |
171 | } |
172 | |
173 | return cpu_to_le16(dur); |
174 | } |
175 | |
176 | static int inline is_ieee80211_device(struct ieee80211_local *local, |
177 | struct net_device *dev) |
178 | { |
179 | return local == wdev_priv(dev->ieee80211_ptr); |
180 | } |
181 | |
182 | /* tx handlers */ |
183 | |
184 | static ieee80211_tx_result debug_noinline |
185 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
186 | { |
187 | |
188 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
189 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
190 | u32 sta_flags; |
191 | |
192 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
193 | return TX_CONTINUE; |
194 | |
195 | if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) && |
196 | !ieee80211_is_probe_req(hdr->frame_control) && |
197 | !ieee80211_is_nullfunc(hdr->frame_control)) |
198 | /* |
199 | * When software scanning only nullfunc frames (to notify |
200 | * the sleep state to the AP) and probe requests (for the |
201 | * active scan) are allowed, all other frames should not be |
202 | * sent and we should not get here, but if we do |
203 | * nonetheless, drop them to avoid sending them |
204 | * off-channel. See the link below and |
205 | * ieee80211_start_scan() for more. |
206 | * |
207 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 |
208 | */ |
209 | return TX_DROP; |
210 | |
211 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
212 | return TX_CONTINUE; |
213 | |
214 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
215 | return TX_CONTINUE; |
216 | |
217 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
218 | |
219 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
220 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
221 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
222 | ieee80211_is_data(hdr->frame_control))) { |
223 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
224 | printk(KERN_DEBUG "%s: dropped data frame to not " |
225 | "associated station %pM\n", |
226 | tx->dev->name, hdr->addr1); |
227 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
228 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); |
229 | return TX_DROP; |
230 | } |
231 | } else { |
232 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
233 | tx->local->num_sta == 0 && |
234 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
235 | /* |
236 | * No associated STAs - no need to send multicast |
237 | * frames. |
238 | */ |
239 | return TX_DROP; |
240 | } |
241 | return TX_CONTINUE; |
242 | } |
243 | |
244 | return TX_CONTINUE; |
245 | } |
246 | |
247 | /* This function is called whenever the AP is about to exceed the maximum limit |
248 | * of buffered frames for power saving STAs. This situation should not really |
249 | * happen often during normal operation, so dropping the oldest buffered packet |
250 | * from each queue should be OK to make some room for new frames. */ |
251 | static void purge_old_ps_buffers(struct ieee80211_local *local) |
252 | { |
253 | int total = 0, purged = 0; |
254 | struct sk_buff *skb; |
255 | struct ieee80211_sub_if_data *sdata; |
256 | struct sta_info *sta; |
257 | |
258 | /* |
259 | * virtual interfaces are protected by RCU |
260 | */ |
261 | rcu_read_lock(); |
262 | |
263 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
264 | struct ieee80211_if_ap *ap; |
265 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
266 | continue; |
267 | ap = &sdata->u.ap; |
268 | skb = skb_dequeue(&ap->ps_bc_buf); |
269 | if (skb) { |
270 | purged++; |
271 | dev_kfree_skb(skb); |
272 | } |
273 | total += skb_queue_len(&ap->ps_bc_buf); |
274 | } |
275 | |
276 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
277 | skb = skb_dequeue(&sta->ps_tx_buf); |
278 | if (skb) { |
279 | purged++; |
280 | dev_kfree_skb(skb); |
281 | } |
282 | total += skb_queue_len(&sta->ps_tx_buf); |
283 | } |
284 | |
285 | rcu_read_unlock(); |
286 | |
287 | local->total_ps_buffered = total; |
288 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
289 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
290 | wiphy_name(local->hw.wiphy), purged); |
291 | #endif |
292 | } |
293 | |
294 | static ieee80211_tx_result |
295 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
296 | { |
297 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
298 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
299 | |
300 | /* |
301 | * broadcast/multicast frame |
302 | * |
303 | * If any of the associated stations is in power save mode, |
304 | * the frame is buffered to be sent after DTIM beacon frame. |
305 | * This is done either by the hardware or us. |
306 | */ |
307 | |
308 | /* powersaving STAs only in AP/VLAN mode */ |
309 | if (!tx->sdata->bss) |
310 | return TX_CONTINUE; |
311 | |
312 | /* no buffering for ordered frames */ |
313 | if (ieee80211_has_order(hdr->frame_control)) |
314 | return TX_CONTINUE; |
315 | |
316 | /* no stations in PS mode */ |
317 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) |
318 | return TX_CONTINUE; |
319 | |
320 | /* buffered in hardware */ |
321 | if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) { |
322 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
323 | |
324 | return TX_CONTINUE; |
325 | } |
326 | |
327 | /* buffered in mac80211 */ |
328 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
329 | purge_old_ps_buffers(tx->local); |
330 | |
331 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { |
332 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
333 | if (net_ratelimit()) |
334 | printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", |
335 | tx->dev->name); |
336 | #endif |
337 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
338 | } else |
339 | tx->local->total_ps_buffered++; |
340 | |
341 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); |
342 | |
343 | return TX_QUEUED; |
344 | } |
345 | |
346 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
347 | struct sk_buff *skb) |
348 | { |
349 | if (!ieee80211_is_mgmt(fc)) |
350 | return 0; |
351 | |
352 | if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) |
353 | return 0; |
354 | |
355 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) |
356 | skb->data)) |
357 | return 0; |
358 | |
359 | return 1; |
360 | } |
361 | |
362 | static ieee80211_tx_result |
363 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
364 | { |
365 | struct sta_info *sta = tx->sta; |
366 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
367 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
368 | u32 staflags; |
369 | |
370 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control) |
371 | || ieee80211_is_auth(hdr->frame_control) |
372 | || ieee80211_is_assoc_resp(hdr->frame_control) |
373 | || ieee80211_is_reassoc_resp(hdr->frame_control))) |
374 | return TX_CONTINUE; |
375 | |
376 | staflags = get_sta_flags(sta); |
377 | |
378 | if (unlikely((staflags & WLAN_STA_PS) && |
379 | !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) { |
380 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
381 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
382 | "before %d)\n", |
383 | sta->sta.addr, sta->sta.aid, |
384 | skb_queue_len(&sta->ps_tx_buf)); |
385 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
386 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
387 | purge_old_ps_buffers(tx->local); |
388 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { |
389 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); |
390 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
391 | if (net_ratelimit()) { |
392 | printk(KERN_DEBUG "%s: STA %pM TX " |
393 | "buffer full - dropping oldest frame\n", |
394 | tx->dev->name, sta->sta.addr); |
395 | } |
396 | #endif |
397 | dev_kfree_skb(old); |
398 | } else |
399 | tx->local->total_ps_buffered++; |
400 | |
401 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
402 | if (skb_queue_empty(&sta->ps_tx_buf)) |
403 | sta_info_set_tim_bit(sta); |
404 | |
405 | info->control.jiffies = jiffies; |
406 | info->control.vif = &tx->sdata->vif; |
407 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
408 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
409 | return TX_QUEUED; |
410 | } |
411 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
412 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
413 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
414 | "set -> send frame\n", tx->dev->name, |
415 | sta->sta.addr); |
416 | } |
417 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
418 | |
419 | return TX_CONTINUE; |
420 | } |
421 | |
422 | static ieee80211_tx_result debug_noinline |
423 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
424 | { |
425 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
426 | return TX_CONTINUE; |
427 | |
428 | if (tx->flags & IEEE80211_TX_UNICAST) |
429 | return ieee80211_tx_h_unicast_ps_buf(tx); |
430 | else |
431 | return ieee80211_tx_h_multicast_ps_buf(tx); |
432 | } |
433 | |
434 | static ieee80211_tx_result debug_noinline |
435 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
436 | { |
437 | struct ieee80211_key *key = NULL; |
438 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
439 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
440 | |
441 | if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) |
442 | tx->key = NULL; |
443 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
444 | tx->key = key; |
445 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
446 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) |
447 | tx->key = key; |
448 | else if ((key = rcu_dereference(tx->sdata->default_key))) |
449 | tx->key = key; |
450 | else if (tx->sdata->drop_unencrypted && |
451 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
452 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
453 | (!ieee80211_is_robust_mgmt_frame(hdr) || |
454 | (ieee80211_is_action(hdr->frame_control) && |
455 | tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { |
456 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
457 | return TX_DROP; |
458 | } else |
459 | tx->key = NULL; |
460 | |
461 | if (tx->key) { |
462 | tx->key->tx_rx_count++; |
463 | /* TODO: add threshold stuff again */ |
464 | |
465 | switch (tx->key->conf.alg) { |
466 | case ALG_WEP: |
467 | if (ieee80211_is_auth(hdr->frame_control)) |
468 | break; |
469 | case ALG_TKIP: |
470 | if (!ieee80211_is_data_present(hdr->frame_control)) |
471 | tx->key = NULL; |
472 | break; |
473 | case ALG_CCMP: |
474 | if (!ieee80211_is_data_present(hdr->frame_control) && |
475 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, |
476 | tx->skb)) |
477 | tx->key = NULL; |
478 | break; |
479 | case ALG_AES_CMAC: |
480 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
481 | tx->key = NULL; |
482 | break; |
483 | } |
484 | } |
485 | |
486 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
487 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
488 | |
489 | return TX_CONTINUE; |
490 | } |
491 | |
492 | static ieee80211_tx_result debug_noinline |
493 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
494 | { |
495 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
496 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
497 | struct ieee80211_supported_band *sband; |
498 | struct ieee80211_rate *rate; |
499 | int i, len; |
500 | bool inval = false, rts = false, short_preamble = false; |
501 | struct ieee80211_tx_rate_control txrc; |
502 | u32 sta_flags; |
503 | |
504 | memset(&txrc, 0, sizeof(txrc)); |
505 | |
506 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
507 | |
508 | len = min_t(int, tx->skb->len + FCS_LEN, |
509 | tx->local->hw.wiphy->frag_threshold); |
510 | |
511 | /* set up the tx rate control struct we give the RC algo */ |
512 | txrc.hw = local_to_hw(tx->local); |
513 | txrc.sband = sband; |
514 | txrc.bss_conf = &tx->sdata->vif.bss_conf; |
515 | txrc.skb = tx->skb; |
516 | txrc.reported_rate.idx = -1; |
517 | txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx; |
518 | |
519 | /* set up RTS protection if desired */ |
520 | if (len > tx->local->hw.wiphy->rts_threshold) { |
521 | txrc.rts = rts = true; |
522 | } |
523 | |
524 | /* |
525 | * Use short preamble if the BSS can handle it, but not for |
526 | * management frames unless we know the receiver can handle |
527 | * that -- the management frame might be to a station that |
528 | * just wants a probe response. |
529 | */ |
530 | if (tx->sdata->vif.bss_conf.use_short_preamble && |
531 | (ieee80211_is_data(hdr->frame_control) || |
532 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) |
533 | txrc.short_preamble = short_preamble = true; |
534 | |
535 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
536 | |
537 | /* |
538 | * Lets not bother rate control if we're associated and cannot |
539 | * talk to the sta. This should not happen. |
540 | */ |
541 | if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && |
542 | (sta_flags & WLAN_STA_ASSOC) && |
543 | !rate_usable_index_exists(sband, &tx->sta->sta), |
544 | "%s: Dropped data frame as no usable bitrate found while " |
545 | "scanning and associated. Target station: " |
546 | "%pM on %d GHz band\n", |
547 | tx->dev->name, hdr->addr1, |
548 | tx->channel->band ? 5 : 2)) |
549 | return TX_DROP; |
550 | |
551 | /* |
552 | * If we're associated with the sta at this point we know we can at |
553 | * least send the frame at the lowest bit rate. |
554 | */ |
555 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
556 | |
557 | if (unlikely(info->control.rates[0].idx < 0)) |
558 | return TX_DROP; |
559 | |
560 | if (txrc.reported_rate.idx < 0) |
561 | txrc.reported_rate = info->control.rates[0]; |
562 | |
563 | if (tx->sta) |
564 | tx->sta->last_tx_rate = txrc.reported_rate; |
565 | |
566 | if (unlikely(!info->control.rates[0].count)) |
567 | info->control.rates[0].count = 1; |
568 | |
569 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && |
570 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) |
571 | info->control.rates[0].count = 1; |
572 | |
573 | if (is_multicast_ether_addr(hdr->addr1)) { |
574 | /* |
575 | * XXX: verify the rate is in the basic rateset |
576 | */ |
577 | return TX_CONTINUE; |
578 | } |
579 | |
580 | /* |
581 | * set up the RTS/CTS rate as the fastest basic rate |
582 | * that is not faster than the data rate |
583 | * |
584 | * XXX: Should this check all retry rates? |
585 | */ |
586 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { |
587 | s8 baserate = 0; |
588 | |
589 | rate = &sband->bitrates[info->control.rates[0].idx]; |
590 | |
591 | for (i = 0; i < sband->n_bitrates; i++) { |
592 | /* must be a basic rate */ |
593 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) |
594 | continue; |
595 | /* must not be faster than the data rate */ |
596 | if (sband->bitrates[i].bitrate > rate->bitrate) |
597 | continue; |
598 | /* maximum */ |
599 | if (sband->bitrates[baserate].bitrate < |
600 | sband->bitrates[i].bitrate) |
601 | baserate = i; |
602 | } |
603 | |
604 | info->control.rts_cts_rate_idx = baserate; |
605 | } |
606 | |
607 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
608 | /* |
609 | * make sure there's no valid rate following |
610 | * an invalid one, just in case drivers don't |
611 | * take the API seriously to stop at -1. |
612 | */ |
613 | if (inval) { |
614 | info->control.rates[i].idx = -1; |
615 | continue; |
616 | } |
617 | if (info->control.rates[i].idx < 0) { |
618 | inval = true; |
619 | continue; |
620 | } |
621 | |
622 | /* |
623 | * For now assume MCS is already set up correctly, this |
624 | * needs to be fixed. |
625 | */ |
626 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { |
627 | WARN_ON(info->control.rates[i].idx > 76); |
628 | continue; |
629 | } |
630 | |
631 | /* set up RTS protection if desired */ |
632 | if (rts) |
633 | info->control.rates[i].flags |= |
634 | IEEE80211_TX_RC_USE_RTS_CTS; |
635 | |
636 | /* RC is busted */ |
637 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
638 | sband->n_bitrates)) { |
639 | info->control.rates[i].idx = -1; |
640 | continue; |
641 | } |
642 | |
643 | rate = &sband->bitrates[info->control.rates[i].idx]; |
644 | |
645 | /* set up short preamble */ |
646 | if (short_preamble && |
647 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) |
648 | info->control.rates[i].flags |= |
649 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; |
650 | |
651 | /* set up G protection */ |
652 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && |
653 | rate->flags & IEEE80211_RATE_ERP_G) |
654 | info->control.rates[i].flags |= |
655 | IEEE80211_TX_RC_USE_CTS_PROTECT; |
656 | } |
657 | |
658 | return TX_CONTINUE; |
659 | } |
660 | |
661 | static ieee80211_tx_result debug_noinline |
662 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
663 | { |
664 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
665 | |
666 | if (tx->sta) |
667 | info->control.sta = &tx->sta->sta; |
668 | |
669 | return TX_CONTINUE; |
670 | } |
671 | |
672 | static ieee80211_tx_result debug_noinline |
673 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) |
674 | { |
675 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
676 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
677 | u16 *seq; |
678 | u8 *qc; |
679 | int tid; |
680 | |
681 | /* |
682 | * Packet injection may want to control the sequence |
683 | * number, if we have no matching interface then we |
684 | * neither assign one ourselves nor ask the driver to. |
685 | */ |
686 | if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) |
687 | return TX_CONTINUE; |
688 | |
689 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
690 | return TX_CONTINUE; |
691 | |
692 | if (ieee80211_hdrlen(hdr->frame_control) < 24) |
693 | return TX_CONTINUE; |
694 | |
695 | /* |
696 | * Anything but QoS data that has a sequence number field |
697 | * (is long enough) gets a sequence number from the global |
698 | * counter. |
699 | */ |
700 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
701 | /* driver should assign sequence number */ |
702 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
703 | /* for pure STA mode without beacons, we can do it */ |
704 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); |
705 | tx->sdata->sequence_number += 0x10; |
706 | return TX_CONTINUE; |
707 | } |
708 | |
709 | /* |
710 | * This should be true for injected/management frames only, for |
711 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ |
712 | * above since they are not QoS-data frames. |
713 | */ |
714 | if (!tx->sta) |
715 | return TX_CONTINUE; |
716 | |
717 | /* include per-STA, per-TID sequence counter */ |
718 | |
719 | qc = ieee80211_get_qos_ctl(hdr); |
720 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
721 | seq = &tx->sta->tid_seq[tid]; |
722 | |
723 | hdr->seq_ctrl = cpu_to_le16(*seq); |
724 | |
725 | /* Increase the sequence number. */ |
726 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; |
727 | |
728 | return TX_CONTINUE; |
729 | } |
730 | |
731 | static int ieee80211_fragment(struct ieee80211_local *local, |
732 | struct sk_buff *skb, int hdrlen, |
733 | int frag_threshold) |
734 | { |
735 | struct sk_buff *tail = skb, *tmp; |
736 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; |
737 | int pos = hdrlen + per_fragm; |
738 | int rem = skb->len - hdrlen - per_fragm; |
739 | |
740 | if (WARN_ON(rem < 0)) |
741 | return -EINVAL; |
742 | |
743 | while (rem) { |
744 | int fraglen = per_fragm; |
745 | |
746 | if (fraglen > rem) |
747 | fraglen = rem; |
748 | rem -= fraglen; |
749 | tmp = dev_alloc_skb(local->tx_headroom + |
750 | frag_threshold + |
751 | IEEE80211_ENCRYPT_HEADROOM + |
752 | IEEE80211_ENCRYPT_TAILROOM); |
753 | if (!tmp) |
754 | return -ENOMEM; |
755 | tail->next = tmp; |
756 | tail = tmp; |
757 | skb_reserve(tmp, local->tx_headroom + |
758 | IEEE80211_ENCRYPT_HEADROOM); |
759 | /* copy control information */ |
760 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); |
761 | skb_copy_queue_mapping(tmp, skb); |
762 | tmp->priority = skb->priority; |
763 | tmp->dev = skb->dev; |
764 | |
765 | /* copy header and data */ |
766 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); |
767 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); |
768 | |
769 | pos += fraglen; |
770 | } |
771 | |
772 | skb->len = hdrlen + per_fragm; |
773 | return 0; |
774 | } |
775 | |
776 | static ieee80211_tx_result debug_noinline |
777 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
778 | { |
779 | struct sk_buff *skb = tx->skb; |
780 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
781 | struct ieee80211_hdr *hdr = (void *)skb->data; |
782 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; |
783 | int hdrlen; |
784 | int fragnum; |
785 | |
786 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) |
787 | return TX_CONTINUE; |
788 | |
789 | /* |
790 | * Warn when submitting a fragmented A-MPDU frame and drop it. |
791 | * This scenario is handled in ieee80211_tx_prepare but extra |
792 | * caution taken here as fragmented ampdu may cause Tx stop. |
793 | */ |
794 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
795 | return TX_DROP; |
796 | |
797 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
798 | |
799 | /* internal error, why is TX_FRAGMENTED set? */ |
800 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) |
801 | return TX_DROP; |
802 | |
803 | /* |
804 | * Now fragment the frame. This will allocate all the fragments and |
805 | * chain them (using skb as the first fragment) to skb->next. |
806 | * During transmission, we will remove the successfully transmitted |
807 | * fragments from this list. When the low-level driver rejects one |
808 | * of the fragments then we will simply pretend to accept the skb |
809 | * but store it away as pending. |
810 | */ |
811 | if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) |
812 | return TX_DROP; |
813 | |
814 | /* update duration/seq/flags of fragments */ |
815 | fragnum = 0; |
816 | do { |
817 | int next_len; |
818 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); |
819 | |
820 | hdr = (void *)skb->data; |
821 | info = IEEE80211_SKB_CB(skb); |
822 | |
823 | if (skb->next) { |
824 | hdr->frame_control |= morefrags; |
825 | next_len = skb->next->len; |
826 | /* |
827 | * No multi-rate retries for fragmented frames, that |
828 | * would completely throw off the NAV at other STAs. |
829 | */ |
830 | info->control.rates[1].idx = -1; |
831 | info->control.rates[2].idx = -1; |
832 | info->control.rates[3].idx = -1; |
833 | info->control.rates[4].idx = -1; |
834 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); |
835 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
836 | } else { |
837 | hdr->frame_control &= ~morefrags; |
838 | next_len = 0; |
839 | } |
840 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); |
841 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); |
842 | fragnum++; |
843 | } while ((skb = skb->next)); |
844 | |
845 | return TX_CONTINUE; |
846 | } |
847 | |
848 | static ieee80211_tx_result debug_noinline |
849 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
850 | { |
851 | struct sk_buff *skb = tx->skb; |
852 | |
853 | if (!tx->sta) |
854 | return TX_CONTINUE; |
855 | |
856 | tx->sta->tx_packets++; |
857 | do { |
858 | tx->sta->tx_fragments++; |
859 | tx->sta->tx_bytes += skb->len; |
860 | } while ((skb = skb->next)); |
861 | |
862 | return TX_CONTINUE; |
863 | } |
864 | |
865 | static ieee80211_tx_result debug_noinline |
866 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
867 | { |
868 | if (!tx->key) |
869 | return TX_CONTINUE; |
870 | |
871 | switch (tx->key->conf.alg) { |
872 | case ALG_WEP: |
873 | return ieee80211_crypto_wep_encrypt(tx); |
874 | case ALG_TKIP: |
875 | return ieee80211_crypto_tkip_encrypt(tx); |
876 | case ALG_CCMP: |
877 | return ieee80211_crypto_ccmp_encrypt(tx); |
878 | case ALG_AES_CMAC: |
879 | return ieee80211_crypto_aes_cmac_encrypt(tx); |
880 | } |
881 | |
882 | /* not reached */ |
883 | WARN_ON(1); |
884 | return TX_DROP; |
885 | } |
886 | |
887 | static ieee80211_tx_result debug_noinline |
888 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
889 | { |
890 | struct sk_buff *skb = tx->skb; |
891 | struct ieee80211_hdr *hdr; |
892 | int next_len; |
893 | bool group_addr; |
894 | |
895 | do { |
896 | hdr = (void *) skb->data; |
897 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) |
898 | break; /* must not overwrite AID */ |
899 | next_len = skb->next ? skb->next->len : 0; |
900 | group_addr = is_multicast_ether_addr(hdr->addr1); |
901 | |
902 | hdr->duration_id = |
903 | ieee80211_duration(tx, group_addr, next_len); |
904 | } while ((skb = skb->next)); |
905 | |
906 | return TX_CONTINUE; |
907 | } |
908 | |
909 | /* actual transmit path */ |
910 | |
911 | /* |
912 | * deal with packet injection down monitor interface |
913 | * with Radiotap Header -- only called for monitor mode interface |
914 | */ |
915 | static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
916 | struct sk_buff *skb) |
917 | { |
918 | /* |
919 | * this is the moment to interpret and discard the radiotap header that |
920 | * must be at the start of the packet injected in Monitor mode |
921 | * |
922 | * Need to take some care with endian-ness since radiotap |
923 | * args are little-endian |
924 | */ |
925 | |
926 | struct ieee80211_radiotap_iterator iterator; |
927 | struct ieee80211_radiotap_header *rthdr = |
928 | (struct ieee80211_radiotap_header *) skb->data; |
929 | struct ieee80211_supported_band *sband; |
930 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
931 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
932 | |
933 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
934 | |
935 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
936 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
937 | |
938 | /* |
939 | * for every radiotap entry that is present |
940 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more |
941 | * entries present, or -EINVAL on error) |
942 | */ |
943 | |
944 | while (!ret) { |
945 | ret = ieee80211_radiotap_iterator_next(&iterator); |
946 | |
947 | if (ret) |
948 | continue; |
949 | |
950 | /* see if this argument is something we can use */ |
951 | switch (iterator.this_arg_index) { |
952 | /* |
953 | * You must take care when dereferencing iterator.this_arg |
954 | * for multibyte types... the pointer is not aligned. Use |
955 | * get_unaligned((type *)iterator.this_arg) to dereference |
956 | * iterator.this_arg for type "type" safely on all arches. |
957 | */ |
958 | case IEEE80211_RADIOTAP_FLAGS: |
959 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { |
960 | /* |
961 | * this indicates that the skb we have been |
962 | * handed has the 32-bit FCS CRC at the end... |
963 | * we should react to that by snipping it off |
964 | * because it will be recomputed and added |
965 | * on transmission |
966 | */ |
967 | if (skb->len < (iterator.max_length + FCS_LEN)) |
968 | return false; |
969 | |
970 | skb_trim(skb, skb->len - FCS_LEN); |
971 | } |
972 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
973 | info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; |
974 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
975 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
976 | break; |
977 | |
978 | /* |
979 | * Please update the file |
980 | * Documentation/networking/mac80211-injection.txt |
981 | * when parsing new fields here. |
982 | */ |
983 | |
984 | default: |
985 | break; |
986 | } |
987 | } |
988 | |
989 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ |
990 | return false; |
991 | |
992 | /* |
993 | * remove the radiotap header |
994 | * iterator->max_length was sanity-checked against |
995 | * skb->len by iterator init |
996 | */ |
997 | skb_pull(skb, iterator.max_length); |
998 | |
999 | return true; |
1000 | } |
1001 | |
1002 | /* |
1003 | * initialises @tx |
1004 | */ |
1005 | static ieee80211_tx_result |
1006 | ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, |
1007 | struct ieee80211_tx_data *tx, |
1008 | struct sk_buff *skb) |
1009 | { |
1010 | struct ieee80211_local *local = sdata->local; |
1011 | struct ieee80211_hdr *hdr; |
1012 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1013 | int hdrlen, tid; |
1014 | u8 *qc, *state; |
1015 | bool queued = false; |
1016 | |
1017 | memset(tx, 0, sizeof(*tx)); |
1018 | tx->skb = skb; |
1019 | tx->dev = sdata->dev; /* use original interface */ |
1020 | tx->local = local; |
1021 | tx->sdata = sdata; |
1022 | tx->channel = local->hw.conf.channel; |
1023 | /* |
1024 | * Set this flag (used below to indicate "automatic fragmentation"), |
1025 | * it will be cleared/left by radiotap as desired. |
1026 | */ |
1027 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
1028 | |
1029 | /* process and remove the injection radiotap header */ |
1030 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
1031 | if (!__ieee80211_parse_tx_radiotap(tx, skb)) |
1032 | return TX_DROP; |
1033 | |
1034 | /* |
1035 | * __ieee80211_parse_tx_radiotap has now removed |
1036 | * the radiotap header that was present and pre-filled |
1037 | * 'tx' with tx control information. |
1038 | */ |
1039 | } |
1040 | |
1041 | /* |
1042 | * If this flag is set to true anywhere, and we get here, |
1043 | * we are doing the needed processing, so remove the flag |
1044 | * now. |
1045 | */ |
1046 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
1047 | |
1048 | hdr = (struct ieee80211_hdr *) skb->data; |
1049 | |
1050 | tx->sta = sta_info_get(local, hdr->addr1); |
1051 | |
1052 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
1053 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { |
1054 | unsigned long flags; |
1055 | struct tid_ampdu_tx *tid_tx; |
1056 | |
1057 | qc = ieee80211_get_qos_ctl(hdr); |
1058 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
1059 | |
1060 | spin_lock_irqsave(&tx->sta->lock, flags); |
1061 | /* |
1062 | * XXX: This spinlock could be fairly expensive, but see the |
1063 | * comment in agg-tx.c:ieee80211_agg_tx_operational(). |
1064 | * One way to solve this would be to do something RCU-like |
1065 | * for managing the tid_tx struct and using atomic bitops |
1066 | * for the actual state -- by introducing an actual |
1067 | * 'operational' bit that would be possible. It would |
1068 | * require changing ieee80211_agg_tx_operational() to |
1069 | * set that bit, and changing the way tid_tx is managed |
1070 | * everywhere, including races between that bit and |
1071 | * tid_tx going away (tid_tx being added can be easily |
1072 | * committed to memory before the 'operational' bit). |
1073 | */ |
1074 | tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; |
1075 | state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; |
1076 | if (*state == HT_AGG_STATE_OPERATIONAL) { |
1077 | info->flags |= IEEE80211_TX_CTL_AMPDU; |
1078 | } else if (*state != HT_AGG_STATE_IDLE) { |
1079 | /* in progress */ |
1080 | queued = true; |
1081 | info->control.vif = &sdata->vif; |
1082 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
1083 | __skb_queue_tail(&tid_tx->pending, skb); |
1084 | } |
1085 | spin_unlock_irqrestore(&tx->sta->lock, flags); |
1086 | |
1087 | if (unlikely(queued)) |
1088 | return TX_QUEUED; |
1089 | } |
1090 | |
1091 | if (is_multicast_ether_addr(hdr->addr1)) { |
1092 | tx->flags &= ~IEEE80211_TX_UNICAST; |
1093 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
1094 | } else { |
1095 | tx->flags |= IEEE80211_TX_UNICAST; |
1096 | if (unlikely(local->wifi_wme_noack_test)) |
1097 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
1098 | else |
1099 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
1100 | } |
1101 | |
1102 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1103 | if ((tx->flags & IEEE80211_TX_UNICAST) && |
1104 | skb->len + FCS_LEN > local->hw.wiphy->frag_threshold && |
1105 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
1106 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
1107 | else |
1108 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
1109 | } |
1110 | |
1111 | if (!tx->sta) |
1112 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1113 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
1114 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1115 | |
1116 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
1117 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1118 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; |
1119 | tx->ethertype = (pos[0] << 8) | pos[1]; |
1120 | } |
1121 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
1122 | |
1123 | return TX_CONTINUE; |
1124 | } |
1125 | |
1126 | static int __ieee80211_tx(struct ieee80211_local *local, |
1127 | struct sk_buff **skbp, |
1128 | struct sta_info *sta, |
1129 | bool txpending) |
1130 | { |
1131 | struct sk_buff *skb = *skbp, *next; |
1132 | struct ieee80211_tx_info *info; |
1133 | struct ieee80211_sub_if_data *sdata; |
1134 | unsigned long flags; |
1135 | int ret, len; |
1136 | bool fragm = false; |
1137 | |
1138 | while (skb) { |
1139 | int q = skb_get_queue_mapping(skb); |
1140 | |
1141 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
1142 | ret = IEEE80211_TX_OK; |
1143 | if (local->queue_stop_reasons[q] || |
1144 | (!txpending && !skb_queue_empty(&local->pending[q]))) |
1145 | ret = IEEE80211_TX_PENDING; |
1146 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
1147 | if (ret != IEEE80211_TX_OK) |
1148 | return ret; |
1149 | |
1150 | info = IEEE80211_SKB_CB(skb); |
1151 | |
1152 | if (fragm) |
1153 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
1154 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
1155 | |
1156 | next = skb->next; |
1157 | len = skb->len; |
1158 | |
1159 | if (next) |
1160 | info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; |
1161 | |
1162 | sdata = vif_to_sdata(info->control.vif); |
1163 | |
1164 | switch (sdata->vif.type) { |
1165 | case NL80211_IFTYPE_MONITOR: |
1166 | info->control.vif = NULL; |
1167 | break; |
1168 | case NL80211_IFTYPE_AP_VLAN: |
1169 | info->control.vif = &container_of(sdata->bss, |
1170 | struct ieee80211_sub_if_data, u.ap)->vif; |
1171 | break; |
1172 | default: |
1173 | /* keep */ |
1174 | break; |
1175 | } |
1176 | |
1177 | ret = drv_tx(local, skb); |
1178 | if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { |
1179 | dev_kfree_skb(skb); |
1180 | ret = NETDEV_TX_OK; |
1181 | } |
1182 | if (ret != NETDEV_TX_OK) { |
1183 | info->control.vif = &sdata->vif; |
1184 | return IEEE80211_TX_AGAIN; |
1185 | } |
1186 | |
1187 | *skbp = skb = next; |
1188 | ieee80211_led_tx(local, 1); |
1189 | fragm = true; |
1190 | } |
1191 | |
1192 | return IEEE80211_TX_OK; |
1193 | } |
1194 | |
1195 | /* |
1196 | * Invoke TX handlers, return 0 on success and non-zero if the |
1197 | * frame was dropped or queued. |
1198 | */ |
1199 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) |
1200 | { |
1201 | struct sk_buff *skb = tx->skb; |
1202 | ieee80211_tx_result res = TX_DROP; |
1203 | |
1204 | #define CALL_TXH(txh) \ |
1205 | res = txh(tx); \ |
1206 | if (res != TX_CONTINUE) \ |
1207 | goto txh_done; |
1208 | |
1209 | CALL_TXH(ieee80211_tx_h_check_assoc) |
1210 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1211 | CALL_TXH(ieee80211_tx_h_select_key) |
1212 | CALL_TXH(ieee80211_tx_h_michael_mic_add) |
1213 | CALL_TXH(ieee80211_tx_h_rate_ctrl) |
1214 | CALL_TXH(ieee80211_tx_h_misc) |
1215 | CALL_TXH(ieee80211_tx_h_sequence) |
1216 | CALL_TXH(ieee80211_tx_h_fragment) |
1217 | /* handlers after fragment must be aware of tx info fragmentation! */ |
1218 | CALL_TXH(ieee80211_tx_h_stats) |
1219 | CALL_TXH(ieee80211_tx_h_encrypt) |
1220 | CALL_TXH(ieee80211_tx_h_calculate_duration) |
1221 | #undef CALL_TXH |
1222 | |
1223 | txh_done: |
1224 | if (unlikely(res == TX_DROP)) { |
1225 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
1226 | while (skb) { |
1227 | struct sk_buff *next; |
1228 | |
1229 | next = skb->next; |
1230 | dev_kfree_skb(skb); |
1231 | skb = next; |
1232 | } |
1233 | return -1; |
1234 | } else if (unlikely(res == TX_QUEUED)) { |
1235 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
1236 | return -1; |
1237 | } |
1238 | |
1239 | return 0; |
1240 | } |
1241 | |
1242 | static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, |
1243 | struct sk_buff *skb, bool txpending) |
1244 | { |
1245 | struct ieee80211_local *local = sdata->local; |
1246 | struct ieee80211_tx_data tx; |
1247 | ieee80211_tx_result res_prepare; |
1248 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1249 | struct sk_buff *next; |
1250 | unsigned long flags; |
1251 | int ret, retries; |
1252 | u16 queue; |
1253 | |
1254 | queue = skb_get_queue_mapping(skb); |
1255 | |
1256 | if (unlikely(skb->len < 10)) { |
1257 | dev_kfree_skb(skb); |
1258 | return; |
1259 | } |
1260 | |
1261 | rcu_read_lock(); |
1262 | |
1263 | /* initialises tx */ |
1264 | res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); |
1265 | |
1266 | if (unlikely(res_prepare == TX_DROP)) { |
1267 | dev_kfree_skb(skb); |
1268 | rcu_read_unlock(); |
1269 | return; |
1270 | } else if (unlikely(res_prepare == TX_QUEUED)) { |
1271 | rcu_read_unlock(); |
1272 | return; |
1273 | } |
1274 | |
1275 | tx.channel = local->hw.conf.channel; |
1276 | info->band = tx.channel->band; |
1277 | |
1278 | if (invoke_tx_handlers(&tx)) |
1279 | goto out; |
1280 | |
1281 | retries = 0; |
1282 | retry: |
1283 | ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); |
1284 | switch (ret) { |
1285 | case IEEE80211_TX_OK: |
1286 | break; |
1287 | case IEEE80211_TX_AGAIN: |
1288 | /* |
1289 | * Since there are no fragmented frames on A-MPDU |
1290 | * queues, there's no reason for a driver to reject |
1291 | * a frame there, warn and drop it. |
1292 | */ |
1293 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
1294 | goto drop; |
1295 | /* fall through */ |
1296 | case IEEE80211_TX_PENDING: |
1297 | skb = tx.skb; |
1298 | |
1299 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
1300 | |
1301 | if (local->queue_stop_reasons[queue] || |
1302 | !skb_queue_empty(&local->pending[queue])) { |
1303 | /* |
1304 | * if queue is stopped, queue up frames for later |
1305 | * transmission from the tasklet |
1306 | */ |
1307 | do { |
1308 | next = skb->next; |
1309 | skb->next = NULL; |
1310 | if (unlikely(txpending)) |
1311 | __skb_queue_head(&local->pending[queue], |
1312 | skb); |
1313 | else |
1314 | __skb_queue_tail(&local->pending[queue], |
1315 | skb); |
1316 | } while ((skb = next)); |
1317 | |
1318 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1319 | flags); |
1320 | } else { |
1321 | /* |
1322 | * otherwise retry, but this is a race condition or |
1323 | * a driver bug (which we warn about if it persists) |
1324 | */ |
1325 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1326 | flags); |
1327 | |
1328 | retries++; |
1329 | if (WARN(retries > 10, "tx refused but queue active\n")) |
1330 | goto drop; |
1331 | goto retry; |
1332 | } |
1333 | } |
1334 | out: |
1335 | rcu_read_unlock(); |
1336 | return; |
1337 | |
1338 | drop: |
1339 | rcu_read_unlock(); |
1340 | |
1341 | skb = tx.skb; |
1342 | while (skb) { |
1343 | next = skb->next; |
1344 | dev_kfree_skb(skb); |
1345 | skb = next; |
1346 | } |
1347 | } |
1348 | |
1349 | /* device xmit handlers */ |
1350 | |
1351 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1352 | struct sk_buff *skb, |
1353 | int head_need, bool may_encrypt) |
1354 | { |
1355 | int tail_need = 0; |
1356 | |
1357 | /* |
1358 | * This could be optimised, devices that do full hardware |
1359 | * crypto (including TKIP MMIC) need no tailroom... But we |
1360 | * have no drivers for such devices currently. |
1361 | */ |
1362 | if (may_encrypt) { |
1363 | tail_need = IEEE80211_ENCRYPT_TAILROOM; |
1364 | tail_need -= skb_tailroom(skb); |
1365 | tail_need = max_t(int, tail_need, 0); |
1366 | } |
1367 | |
1368 | if (head_need || tail_need) { |
1369 | /* Sorry. Can't account for this any more */ |
1370 | skb_orphan(skb); |
1371 | } |
1372 | |
1373 | if (skb_header_cloned(skb)) |
1374 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); |
1375 | else |
1376 | I802_DEBUG_INC(local->tx_expand_skb_head); |
1377 | |
1378 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { |
1379 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", |
1380 | wiphy_name(local->hw.wiphy)); |
1381 | return -ENOMEM; |
1382 | } |
1383 | |
1384 | /* update truesize too */ |
1385 | skb->truesize += head_need + tail_need; |
1386 | |
1387 | return 0; |
1388 | } |
1389 | |
1390 | static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, |
1391 | struct sk_buff *skb) |
1392 | { |
1393 | struct ieee80211_local *local = sdata->local; |
1394 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1395 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
1396 | struct ieee80211_sub_if_data *tmp_sdata; |
1397 | int headroom; |
1398 | bool may_encrypt; |
1399 | |
1400 | dev_hold(sdata->dev); |
1401 | |
1402 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
1403 | local->hw.conf.dynamic_ps_timeout > 0 && |
1404 | !local->quiescing && |
1405 | !(local->scanning) && local->ps_sdata) { |
1406 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
1407 | ieee80211_stop_queues_by_reason(&local->hw, |
1408 | IEEE80211_QUEUE_STOP_REASON_PS); |
1409 | ieee80211_queue_work(&local->hw, |
1410 | &local->dynamic_ps_disable_work); |
1411 | } |
1412 | |
1413 | mod_timer(&local->dynamic_ps_timer, jiffies + |
1414 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
1415 | } |
1416 | |
1417 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
1418 | |
1419 | if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
1420 | int hdrlen; |
1421 | u16 len_rthdr; |
1422 | |
1423 | info->flags |= IEEE80211_TX_CTL_INJECTED; |
1424 | |
1425 | len_rthdr = ieee80211_get_radiotap_len(skb->data); |
1426 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); |
1427 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
1428 | |
1429 | /* check the header is complete in the frame */ |
1430 | if (likely(skb->len >= len_rthdr + hdrlen)) { |
1431 | /* |
1432 | * We process outgoing injected frames that have a |
1433 | * local address we handle as though they are our |
1434 | * own frames. |
1435 | * This code here isn't entirely correct, the local |
1436 | * MAC address is not necessarily enough to find |
1437 | * the interface to use; for that proper VLAN/WDS |
1438 | * support we will need a different mechanism. |
1439 | */ |
1440 | |
1441 | rcu_read_lock(); |
1442 | list_for_each_entry_rcu(tmp_sdata, &local->interfaces, |
1443 | list) { |
1444 | if (!netif_running(tmp_sdata->dev)) |
1445 | continue; |
1446 | if (tmp_sdata->vif.type != NL80211_IFTYPE_AP) |
1447 | continue; |
1448 | if (compare_ether_addr(tmp_sdata->dev->dev_addr, |
1449 | hdr->addr2) == 0) { |
1450 | dev_hold(tmp_sdata->dev); |
1451 | dev_put(sdata->dev); |
1452 | sdata = tmp_sdata; |
1453 | break; |
1454 | } |
1455 | } |
1456 | rcu_read_unlock(); |
1457 | } |
1458 | } |
1459 | |
1460 | may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); |
1461 | |
1462 | headroom = local->tx_headroom; |
1463 | if (may_encrypt) |
1464 | headroom += IEEE80211_ENCRYPT_HEADROOM; |
1465 | headroom -= skb_headroom(skb); |
1466 | headroom = max_t(int, 0, headroom); |
1467 | |
1468 | if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) { |
1469 | dev_kfree_skb(skb); |
1470 | dev_put(sdata->dev); |
1471 | return; |
1472 | } |
1473 | |
1474 | info->control.vif = &sdata->vif; |
1475 | |
1476 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
1477 | ieee80211_is_data(hdr->frame_control) && |
1478 | !is_multicast_ether_addr(hdr->addr1)) |
1479 | if (mesh_nexthop_lookup(skb, sdata)) { |
1480 | /* skb queued: don't free */ |
1481 | dev_put(sdata->dev); |
1482 | return; |
1483 | } |
1484 | |
1485 | ieee80211_set_qos_hdr(local, skb); |
1486 | ieee80211_tx(sdata, skb, false); |
1487 | dev_put(sdata->dev); |
1488 | } |
1489 | |
1490 | netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, |
1491 | struct net_device *dev) |
1492 | { |
1493 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
1494 | struct ieee80211_channel *chan = local->hw.conf.channel; |
1495 | struct ieee80211_radiotap_header *prthdr = |
1496 | (struct ieee80211_radiotap_header *)skb->data; |
1497 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1498 | u16 len_rthdr; |
1499 | |
1500 | /* |
1501 | * Frame injection is not allowed if beaconing is not allowed |
1502 | * or if we need radar detection. Beaconing is usually not allowed when |
1503 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. |
1504 | * Passive scan is also used in world regulatory domains where |
1505 | * your country is not known and as such it should be treated as |
1506 | * NO TX unless the channel is explicitly allowed in which case |
1507 | * your current regulatory domain would not have the passive scan |
1508 | * flag. |
1509 | * |
1510 | * Since AP mode uses monitor interfaces to inject/TX management |
1511 | * frames we can make AP mode the exception to this rule once it |
1512 | * supports radar detection as its implementation can deal with |
1513 | * radar detection by itself. We can do that later by adding a |
1514 | * monitor flag interfaces used for AP support. |
1515 | */ |
1516 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | |
1517 | IEEE80211_CHAN_PASSIVE_SCAN))) |
1518 | goto fail; |
1519 | |
1520 | /* check for not even having the fixed radiotap header part */ |
1521 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) |
1522 | goto fail; /* too short to be possibly valid */ |
1523 | |
1524 | /* is it a header version we can trust to find length from? */ |
1525 | if (unlikely(prthdr->it_version)) |
1526 | goto fail; /* only version 0 is supported */ |
1527 | |
1528 | /* then there must be a radiotap header with a length we can use */ |
1529 | len_rthdr = ieee80211_get_radiotap_len(skb->data); |
1530 | |
1531 | /* does the skb contain enough to deliver on the alleged length? */ |
1532 | if (unlikely(skb->len < len_rthdr)) |
1533 | goto fail; /* skb too short for claimed rt header extent */ |
1534 | |
1535 | /* |
1536 | * fix up the pointers accounting for the radiotap |
1537 | * header still being in there. We are being given |
1538 | * a precooked IEEE80211 header so no need for |
1539 | * normal processing |
1540 | */ |
1541 | skb_set_mac_header(skb, len_rthdr); |
1542 | /* |
1543 | * these are just fixed to the end of the rt area since we |
1544 | * don't have any better information and at this point, nobody cares |
1545 | */ |
1546 | skb_set_network_header(skb, len_rthdr); |
1547 | skb_set_transport_header(skb, len_rthdr); |
1548 | |
1549 | memset(info, 0, sizeof(*info)); |
1550 | |
1551 | /* pass the radiotap header up to xmit */ |
1552 | ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb); |
1553 | return NETDEV_TX_OK; |
1554 | |
1555 | fail: |
1556 | dev_kfree_skb(skb); |
1557 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ |
1558 | } |
1559 | |
1560 | /** |
1561 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type |
1562 | * subinterfaces (wlan#, WDS, and VLAN interfaces) |
1563 | * @skb: packet to be sent |
1564 | * @dev: incoming interface |
1565 | * |
1566 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will |
1567 | * not be freed, and caller is responsible for either retrying later or freeing |
1568 | * skb). |
1569 | * |
1570 | * This function takes in an Ethernet header and encapsulates it with suitable |
1571 | * IEEE 802.11 header based on which interface the packet is coming in. The |
1572 | * encapsulated packet will then be passed to master interface, wlan#.11, for |
1573 | * transmission (through low-level driver). |
1574 | */ |
1575 | netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, |
1576 | struct net_device *dev) |
1577 | { |
1578 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1579 | struct ieee80211_local *local = sdata->local; |
1580 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1581 | int ret = NETDEV_TX_BUSY, head_need; |
1582 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1583 | __le16 fc; |
1584 | struct ieee80211_hdr hdr; |
1585 | struct ieee80211s_hdr mesh_hdr; |
1586 | const u8 *encaps_data; |
1587 | int encaps_len, skip_header_bytes; |
1588 | int nh_pos, h_pos; |
1589 | struct sta_info *sta; |
1590 | u32 sta_flags = 0; |
1591 | |
1592 | if (unlikely(skb->len < ETH_HLEN)) { |
1593 | ret = NETDEV_TX_OK; |
1594 | goto fail; |
1595 | } |
1596 | |
1597 | nh_pos = skb_network_header(skb) - skb->data; |
1598 | h_pos = skb_transport_header(skb) - skb->data; |
1599 | |
1600 | /* convert Ethernet header to proper 802.11 header (based on |
1601 | * operation mode) */ |
1602 | ethertype = (skb->data[12] << 8) | skb->data[13]; |
1603 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
1604 | |
1605 | switch (sdata->vif.type) { |
1606 | case NL80211_IFTYPE_AP: |
1607 | case NL80211_IFTYPE_AP_VLAN: |
1608 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
1609 | /* DA BSSID SA */ |
1610 | memcpy(hdr.addr1, skb->data, ETH_ALEN); |
1611 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); |
1612 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); |
1613 | hdrlen = 24; |
1614 | break; |
1615 | case NL80211_IFTYPE_WDS: |
1616 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
1617 | /* RA TA DA SA */ |
1618 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); |
1619 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); |
1620 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1621 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); |
1622 | hdrlen = 30; |
1623 | break; |
1624 | #ifdef CONFIG_MAC80211_MESH |
1625 | case NL80211_IFTYPE_MESH_POINT: |
1626 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
1627 | /* Do not send frames with mesh_ttl == 0 */ |
1628 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
1629 | ret = NETDEV_TX_OK; |
1630 | goto fail; |
1631 | } |
1632 | |
1633 | if (compare_ether_addr(dev->dev_addr, |
1634 | skb->data + ETH_ALEN) == 0) { |
1635 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1636 | skb->data, skb->data + ETH_ALEN); |
1637 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, |
1638 | sdata, NULL, NULL, NULL); |
1639 | } else { |
1640 | /* packet from other interface */ |
1641 | struct mesh_path *mppath; |
1642 | int is_mesh_mcast = 1; |
1643 | char *mesh_da; |
1644 | |
1645 | rcu_read_lock(); |
1646 | if (is_multicast_ether_addr(skb->data)) |
1647 | /* DA TA mSA AE:SA */ |
1648 | mesh_da = skb->data; |
1649 | else { |
1650 | mppath = mpp_path_lookup(skb->data, sdata); |
1651 | if (mppath) { |
1652 | /* RA TA mDA mSA AE:DA SA */ |
1653 | mesh_da = mppath->mpp; |
1654 | is_mesh_mcast = 0; |
1655 | } else |
1656 | /* DA TA mSA AE:SA */ |
1657 | mesh_da = dev->broadcast; |
1658 | } |
1659 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1660 | mesh_da, dev->dev_addr); |
1661 | rcu_read_unlock(); |
1662 | if (is_mesh_mcast) |
1663 | meshhdrlen = |
1664 | ieee80211_new_mesh_header(&mesh_hdr, |
1665 | sdata, |
1666 | skb->data + ETH_ALEN, |
1667 | NULL, |
1668 | NULL); |
1669 | else |
1670 | meshhdrlen = |
1671 | ieee80211_new_mesh_header(&mesh_hdr, |
1672 | sdata, |
1673 | NULL, |
1674 | skb->data, |
1675 | skb->data + ETH_ALEN); |
1676 | |
1677 | } |
1678 | break; |
1679 | #endif |
1680 | case NL80211_IFTYPE_STATION: |
1681 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
1682 | /* BSSID SA DA */ |
1683 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
1684 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1685 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1686 | hdrlen = 24; |
1687 | break; |
1688 | case NL80211_IFTYPE_ADHOC: |
1689 | /* DA SA BSSID */ |
1690 | memcpy(hdr.addr1, skb->data, ETH_ALEN); |
1691 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1692 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
1693 | hdrlen = 24; |
1694 | break; |
1695 | default: |
1696 | ret = NETDEV_TX_OK; |
1697 | goto fail; |
1698 | } |
1699 | |
1700 | /* |
1701 | * There's no need to try to look up the destination |
1702 | * if it is a multicast address (which can only happen |
1703 | * in AP mode) |
1704 | */ |
1705 | if (!is_multicast_ether_addr(hdr.addr1)) { |
1706 | rcu_read_lock(); |
1707 | sta = sta_info_get(local, hdr.addr1); |
1708 | /* XXX: in the future, use sdata to look up the sta */ |
1709 | if (sta && sta->sdata == sdata) |
1710 | sta_flags = get_sta_flags(sta); |
1711 | rcu_read_unlock(); |
1712 | } |
1713 | |
1714 | /* receiver and we are QoS enabled, use a QoS type frame */ |
1715 | if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { |
1716 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
1717 | hdrlen += 2; |
1718 | } |
1719 | |
1720 | /* |
1721 | * Drop unicast frames to unauthorised stations unless they are |
1722 | * EAPOL frames from the local station. |
1723 | */ |
1724 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1725 | unlikely(!is_multicast_ether_addr(hdr.addr1) && |
1726 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1727 | !(ethertype == ETH_P_PAE && |
1728 | compare_ether_addr(dev->dev_addr, |
1729 | skb->data + ETH_ALEN) == 0))) { |
1730 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1731 | if (net_ratelimit()) |
1732 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
1733 | " (unauthorized port)\n", dev->name, |
1734 | hdr.addr1); |
1735 | #endif |
1736 | |
1737 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); |
1738 | |
1739 | ret = NETDEV_TX_OK; |
1740 | goto fail; |
1741 | } |
1742 | |
1743 | hdr.frame_control = fc; |
1744 | hdr.duration_id = 0; |
1745 | hdr.seq_ctrl = 0; |
1746 | |
1747 | skip_header_bytes = ETH_HLEN; |
1748 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { |
1749 | encaps_data = bridge_tunnel_header; |
1750 | encaps_len = sizeof(bridge_tunnel_header); |
1751 | skip_header_bytes -= 2; |
1752 | } else if (ethertype >= 0x600) { |
1753 | encaps_data = rfc1042_header; |
1754 | encaps_len = sizeof(rfc1042_header); |
1755 | skip_header_bytes -= 2; |
1756 | } else { |
1757 | encaps_data = NULL; |
1758 | encaps_len = 0; |
1759 | } |
1760 | |
1761 | skb_pull(skb, skip_header_bytes); |
1762 | nh_pos -= skip_header_bytes; |
1763 | h_pos -= skip_header_bytes; |
1764 | |
1765 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
1766 | |
1767 | /* |
1768 | * So we need to modify the skb header and hence need a copy of |
1769 | * that. The head_need variable above doesn't, so far, include |
1770 | * the needed header space that we don't need right away. If we |
1771 | * can, then we don't reallocate right now but only after the |
1772 | * frame arrives at the master device (if it does...) |
1773 | * |
1774 | * If we cannot, however, then we will reallocate to include all |
1775 | * the ever needed space. Also, if we need to reallocate it anyway, |
1776 | * make it big enough for everything we may ever need. |
1777 | */ |
1778 | |
1779 | if (head_need > 0 || skb_cloned(skb)) { |
1780 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1781 | head_need += local->tx_headroom; |
1782 | head_need = max_t(int, 0, head_need); |
1783 | if (ieee80211_skb_resize(local, skb, head_need, true)) |
1784 | goto fail; |
1785 | } |
1786 | |
1787 | if (encaps_data) { |
1788 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); |
1789 | nh_pos += encaps_len; |
1790 | h_pos += encaps_len; |
1791 | } |
1792 | |
1793 | if (meshhdrlen > 0) { |
1794 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); |
1795 | nh_pos += meshhdrlen; |
1796 | h_pos += meshhdrlen; |
1797 | } |
1798 | |
1799 | if (ieee80211_is_data_qos(fc)) { |
1800 | __le16 *qos_control; |
1801 | |
1802 | qos_control = (__le16*) skb_push(skb, 2); |
1803 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); |
1804 | /* |
1805 | * Maybe we could actually set some fields here, for now just |
1806 | * initialise to zero to indicate no special operation. |
1807 | */ |
1808 | *qos_control = 0; |
1809 | } else |
1810 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); |
1811 | |
1812 | nh_pos += hdrlen; |
1813 | h_pos += hdrlen; |
1814 | |
1815 | dev->stats.tx_packets++; |
1816 | dev->stats.tx_bytes += skb->len; |
1817 | |
1818 | /* Update skb pointers to various headers since this modified frame |
1819 | * is going to go through Linux networking code that may potentially |
1820 | * need things like pointer to IP header. */ |
1821 | skb_set_mac_header(skb, 0); |
1822 | skb_set_network_header(skb, nh_pos); |
1823 | skb_set_transport_header(skb, h_pos); |
1824 | |
1825 | memset(info, 0, sizeof(*info)); |
1826 | |
1827 | dev->trans_start = jiffies; |
1828 | ieee80211_xmit(sdata, skb); |
1829 | |
1830 | return NETDEV_TX_OK; |
1831 | |
1832 | fail: |
1833 | if (ret == NETDEV_TX_OK) |
1834 | dev_kfree_skb(skb); |
1835 | |
1836 | return ret; |
1837 | } |
1838 | |
1839 | |
1840 | /* |
1841 | * ieee80211_clear_tx_pending may not be called in a context where |
1842 | * it is possible that it packets could come in again. |
1843 | */ |
1844 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1845 | { |
1846 | int i; |
1847 | |
1848 | for (i = 0; i < local->hw.queues; i++) |
1849 | skb_queue_purge(&local->pending[i]); |
1850 | } |
1851 | |
1852 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
1853 | struct sk_buff *skb) |
1854 | { |
1855 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1856 | struct ieee80211_sub_if_data *sdata; |
1857 | struct sta_info *sta; |
1858 | struct ieee80211_hdr *hdr; |
1859 | int ret; |
1860 | bool result = true; |
1861 | |
1862 | sdata = vif_to_sdata(info->control.vif); |
1863 | |
1864 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { |
1865 | ieee80211_tx(sdata, skb, true); |
1866 | } else { |
1867 | hdr = (struct ieee80211_hdr *)skb->data; |
1868 | sta = sta_info_get(local, hdr->addr1); |
1869 | |
1870 | ret = __ieee80211_tx(local, &skb, sta, true); |
1871 | if (ret != IEEE80211_TX_OK) |
1872 | result = false; |
1873 | } |
1874 | |
1875 | return result; |
1876 | } |
1877 | |
1878 | /* |
1879 | * Transmit all pending packets. Called from tasklet. |
1880 | */ |
1881 | void ieee80211_tx_pending(unsigned long data) |
1882 | { |
1883 | struct ieee80211_local *local = (struct ieee80211_local *)data; |
1884 | unsigned long flags; |
1885 | int i; |
1886 | bool txok; |
1887 | |
1888 | rcu_read_lock(); |
1889 | |
1890 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
1891 | for (i = 0; i < local->hw.queues; i++) { |
1892 | /* |
1893 | * If queue is stopped by something other than due to pending |
1894 | * frames, or we have no pending frames, proceed to next queue. |
1895 | */ |
1896 | if (local->queue_stop_reasons[i] || |
1897 | skb_queue_empty(&local->pending[i])) |
1898 | continue; |
1899 | |
1900 | while (!skb_queue_empty(&local->pending[i])) { |
1901 | struct sk_buff *skb = __skb_dequeue(&local->pending[i]); |
1902 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1903 | struct ieee80211_sub_if_data *sdata; |
1904 | |
1905 | if (WARN_ON(!info->control.vif)) { |
1906 | kfree_skb(skb); |
1907 | continue; |
1908 | } |
1909 | |
1910 | sdata = vif_to_sdata(info->control.vif); |
1911 | dev_hold(sdata->dev); |
1912 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1913 | flags); |
1914 | |
1915 | txok = ieee80211_tx_pending_skb(local, skb); |
1916 | dev_put(sdata->dev); |
1917 | if (!txok) |
1918 | __skb_queue_head(&local->pending[i], skb); |
1919 | spin_lock_irqsave(&local->queue_stop_reason_lock, |
1920 | flags); |
1921 | if (!txok) |
1922 | break; |
1923 | } |
1924 | } |
1925 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
1926 | |
1927 | rcu_read_unlock(); |
1928 | } |
1929 | |
1930 | /* functions for drivers to get certain frames */ |
1931 | |
1932 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
1933 | struct sk_buff *skb, |
1934 | struct beacon_data *beacon) |
1935 | { |
1936 | u8 *pos, *tim; |
1937 | int aid0 = 0; |
1938 | int i, have_bits = 0, n1, n2; |
1939 | |
1940 | /* Generate bitmap for TIM only if there are any STAs in power save |
1941 | * mode. */ |
1942 | if (atomic_read(&bss->num_sta_ps) > 0) |
1943 | /* in the hope that this is faster than |
1944 | * checking byte-for-byte */ |
1945 | have_bits = !bitmap_empty((unsigned long*)bss->tim, |
1946 | IEEE80211_MAX_AID+1); |
1947 | |
1948 | if (bss->dtim_count == 0) |
1949 | bss->dtim_count = beacon->dtim_period - 1; |
1950 | else |
1951 | bss->dtim_count--; |
1952 | |
1953 | tim = pos = (u8 *) skb_put(skb, 6); |
1954 | *pos++ = WLAN_EID_TIM; |
1955 | *pos++ = 4; |
1956 | *pos++ = bss->dtim_count; |
1957 | *pos++ = beacon->dtim_period; |
1958 | |
1959 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) |
1960 | aid0 = 1; |
1961 | |
1962 | if (have_bits) { |
1963 | /* Find largest even number N1 so that bits numbered 1 through |
1964 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits |
1965 | * (N2 + 1) x 8 through 2007 are 0. */ |
1966 | n1 = 0; |
1967 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { |
1968 | if (bss->tim[i]) { |
1969 | n1 = i & 0xfe; |
1970 | break; |
1971 | } |
1972 | } |
1973 | n2 = n1; |
1974 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { |
1975 | if (bss->tim[i]) { |
1976 | n2 = i; |
1977 | break; |
1978 | } |
1979 | } |
1980 | |
1981 | /* Bitmap control */ |
1982 | *pos++ = n1 | aid0; |
1983 | /* Part Virt Bitmap */ |
1984 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); |
1985 | |
1986 | tim[1] = n2 - n1 + 4; |
1987 | skb_put(skb, n2 - n1); |
1988 | } else { |
1989 | *pos++ = aid0; /* Bitmap control */ |
1990 | *pos++ = 0; /* Part Virt Bitmap */ |
1991 | } |
1992 | } |
1993 | |
1994 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
1995 | struct ieee80211_vif *vif) |
1996 | { |
1997 | struct ieee80211_local *local = hw_to_local(hw); |
1998 | struct sk_buff *skb = NULL; |
1999 | struct ieee80211_tx_info *info; |
2000 | struct ieee80211_sub_if_data *sdata = NULL; |
2001 | struct ieee80211_if_ap *ap = NULL; |
2002 | struct beacon_data *beacon; |
2003 | struct ieee80211_supported_band *sband; |
2004 | enum ieee80211_band band = local->hw.conf.channel->band; |
2005 | |
2006 | sband = local->hw.wiphy->bands[band]; |
2007 | |
2008 | rcu_read_lock(); |
2009 | |
2010 | sdata = vif_to_sdata(vif); |
2011 | |
2012 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
2013 | ap = &sdata->u.ap; |
2014 | beacon = rcu_dereference(ap->beacon); |
2015 | if (ap && beacon) { |
2016 | /* |
2017 | * headroom, head length, |
2018 | * tail length and maximum TIM length |
2019 | */ |
2020 | skb = dev_alloc_skb(local->tx_headroom + |
2021 | beacon->head_len + |
2022 | beacon->tail_len + 256); |
2023 | if (!skb) |
2024 | goto out; |
2025 | |
2026 | skb_reserve(skb, local->tx_headroom); |
2027 | memcpy(skb_put(skb, beacon->head_len), beacon->head, |
2028 | beacon->head_len); |
2029 | |
2030 | /* |
2031 | * Not very nice, but we want to allow the driver to call |
2032 | * ieee80211_beacon_get() as a response to the set_tim() |
2033 | * callback. That, however, is already invoked under the |
2034 | * sta_lock to guarantee consistent and race-free update |
2035 | * of the tim bitmap in mac80211 and the driver. |
2036 | */ |
2037 | if (local->tim_in_locked_section) { |
2038 | ieee80211_beacon_add_tim(ap, skb, beacon); |
2039 | } else { |
2040 | unsigned long flags; |
2041 | |
2042 | spin_lock_irqsave(&local->sta_lock, flags); |
2043 | ieee80211_beacon_add_tim(ap, skb, beacon); |
2044 | spin_unlock_irqrestore(&local->sta_lock, flags); |
2045 | } |
2046 | |
2047 | if (beacon->tail) |
2048 | memcpy(skb_put(skb, beacon->tail_len), |
2049 | beacon->tail, beacon->tail_len); |
2050 | } else |
2051 | goto out; |
2052 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
2053 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
2054 | struct ieee80211_hdr *hdr; |
2055 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
2056 | |
2057 | if (!presp) |
2058 | goto out; |
2059 | |
2060 | skb = skb_copy(presp, GFP_ATOMIC); |
2061 | if (!skb) |
2062 | goto out; |
2063 | |
2064 | hdr = (struct ieee80211_hdr *) skb->data; |
2065 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2066 | IEEE80211_STYPE_BEACON); |
2067 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
2068 | struct ieee80211_mgmt *mgmt; |
2069 | u8 *pos; |
2070 | |
2071 | /* headroom, head length, tail length and maximum TIM length */ |
2072 | skb = dev_alloc_skb(local->tx_headroom + 400); |
2073 | if (!skb) |
2074 | goto out; |
2075 | |
2076 | skb_reserve(skb, local->hw.extra_tx_headroom); |
2077 | mgmt = (struct ieee80211_mgmt *) |
2078 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); |
2079 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); |
2080 | mgmt->frame_control = |
2081 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); |
2082 | memset(mgmt->da, 0xff, ETH_ALEN); |
2083 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
2084 | /* BSSID is left zeroed, wildcard value */ |
2085 | mgmt->u.beacon.beacon_int = |
2086 | cpu_to_le16(sdata->vif.bss_conf.beacon_int); |
2087 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ |
2088 | |
2089 | pos = skb_put(skb, 2); |
2090 | *pos++ = WLAN_EID_SSID; |
2091 | *pos++ = 0x0; |
2092 | |
2093 | mesh_mgmt_ies_add(skb, sdata); |
2094 | } else { |
2095 | WARN_ON(1); |
2096 | goto out; |
2097 | } |
2098 | |
2099 | info = IEEE80211_SKB_CB(skb); |
2100 | |
2101 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
2102 | info->band = band; |
2103 | /* |
2104 | * XXX: For now, always use the lowest rate |
2105 | */ |
2106 | info->control.rates[0].idx = 0; |
2107 | info->control.rates[0].count = 1; |
2108 | info->control.rates[1].idx = -1; |
2109 | info->control.rates[2].idx = -1; |
2110 | info->control.rates[3].idx = -1; |
2111 | info->control.rates[4].idx = -1; |
2112 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); |
2113 | |
2114 | info->control.vif = vif; |
2115 | |
2116 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
2117 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
2118 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
2119 | out: |
2120 | rcu_read_unlock(); |
2121 | return skb; |
2122 | } |
2123 | EXPORT_SYMBOL(ieee80211_beacon_get); |
2124 | |
2125 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
2126 | const void *frame, size_t frame_len, |
2127 | const struct ieee80211_tx_info *frame_txctl, |
2128 | struct ieee80211_rts *rts) |
2129 | { |
2130 | const struct ieee80211_hdr *hdr = frame; |
2131 | |
2132 | rts->frame_control = |
2133 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); |
2134 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2135 | frame_txctl); |
2136 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2137 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); |
2138 | } |
2139 | EXPORT_SYMBOL(ieee80211_rts_get); |
2140 | |
2141 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
2142 | const void *frame, size_t frame_len, |
2143 | const struct ieee80211_tx_info *frame_txctl, |
2144 | struct ieee80211_cts *cts) |
2145 | { |
2146 | const struct ieee80211_hdr *hdr = frame; |
2147 | |
2148 | cts->frame_control = |
2149 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); |
2150 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2151 | frame_len, frame_txctl); |
2152 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2153 | } |
2154 | EXPORT_SYMBOL(ieee80211_ctstoself_get); |
2155 | |
2156 | struct sk_buff * |
2157 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
2158 | struct ieee80211_vif *vif) |
2159 | { |
2160 | struct ieee80211_local *local = hw_to_local(hw); |
2161 | struct sk_buff *skb = NULL; |
2162 | struct sta_info *sta; |
2163 | struct ieee80211_tx_data tx; |
2164 | struct ieee80211_sub_if_data *sdata; |
2165 | struct ieee80211_if_ap *bss = NULL; |
2166 | struct beacon_data *beacon; |
2167 | struct ieee80211_tx_info *info; |
2168 | |
2169 | sdata = vif_to_sdata(vif); |
2170 | bss = &sdata->u.ap; |
2171 | |
2172 | rcu_read_lock(); |
2173 | beacon = rcu_dereference(bss->beacon); |
2174 | |
2175 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
2176 | goto out; |
2177 | |
2178 | if (bss->dtim_count != 0) |
2179 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
2180 | |
2181 | while (1) { |
2182 | skb = skb_dequeue(&bss->ps_bc_buf); |
2183 | if (!skb) |
2184 | goto out; |
2185 | local->total_ps_buffered--; |
2186 | |
2187 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { |
2188 | struct ieee80211_hdr *hdr = |
2189 | (struct ieee80211_hdr *) skb->data; |
2190 | /* more buffered multicast/broadcast frames ==> set |
2191 | * MoreData flag in IEEE 802.11 header to inform PS |
2192 | * STAs */ |
2193 | hdr->frame_control |= |
2194 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
2195 | } |
2196 | |
2197 | if (!ieee80211_tx_prepare(sdata, &tx, skb)) |
2198 | break; |
2199 | dev_kfree_skb_any(skb); |
2200 | } |
2201 | |
2202 | info = IEEE80211_SKB_CB(skb); |
2203 | |
2204 | sta = tx.sta; |
2205 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2206 | tx.channel = local->hw.conf.channel; |
2207 | info->band = tx.channel->band; |
2208 | |
2209 | if (invoke_tx_handlers(&tx)) |
2210 | skb = NULL; |
2211 | out: |
2212 | rcu_read_unlock(); |
2213 | |
2214 | return skb; |
2215 | } |
2216 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |
2217 | |
2218 | void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, |
2219 | int encrypt) |
2220 | { |
2221 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2222 | skb_set_mac_header(skb, 0); |
2223 | skb_set_network_header(skb, 0); |
2224 | skb_set_transport_header(skb, 0); |
2225 | |
2226 | if (!encrypt) |
2227 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
2228 | |
2229 | /* send all internal mgmt frames on VO */ |
2230 | skb_set_queue_mapping(skb, 0); |
2231 | |
2232 | /* |
2233 | * The other path calling ieee80211_xmit is from the tasklet, |
2234 | * and while we can handle concurrent transmissions locking |
2235 | * requirements are that we do not come into tx with bhs on. |
2236 | */ |
2237 | local_bh_disable(); |
2238 | ieee80211_xmit(sdata, skb); |
2239 | local_bh_enable(); |
2240 | } |
2241 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9