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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> | |
881d966b | 20 | #include <net/net_namespace.h> |
e2ebc74d JB |
21 | #include <net/ieee80211_radiotap.h> |
22 | #include <net/cfg80211.h> | |
23 | #include <net/mac80211.h> | |
24 | #include <asm/unaligned.h> | |
25 | ||
26 | #include "ieee80211_i.h" | |
27 | #include "ieee80211_led.h" | |
28 | #include "wep.h" | |
29 | #include "wpa.h" | |
30 | #include "wme.h" | |
31 | #include "ieee80211_rate.h" | |
32 | ||
33 | #define IEEE80211_TX_OK 0 | |
34 | #define IEEE80211_TX_AGAIN 1 | |
35 | #define IEEE80211_TX_FRAG_AGAIN 2 | |
36 | ||
37 | /* misc utils */ | |
38 | ||
39 | static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata, | |
40 | struct ieee80211_hdr *hdr) | |
41 | { | |
42 | /* Set the sequence number for this frame. */ | |
43 | hdr->seq_ctrl = cpu_to_le16(sdata->sequence); | |
44 | ||
45 | /* Increase the sequence number. */ | |
46 | sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ; | |
47 | } | |
48 | ||
49 | #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP | |
50 | static void ieee80211_dump_frame(const char *ifname, const char *title, | |
51 | const struct sk_buff *skb) | |
52 | { | |
53 | const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
54 | u16 fc; | |
55 | int hdrlen; | |
56 | ||
57 | printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len); | |
58 | if (skb->len < 4) { | |
59 | printk("\n"); | |
60 | return; | |
61 | } | |
62 | ||
63 | fc = le16_to_cpu(hdr->frame_control); | |
64 | hdrlen = ieee80211_get_hdrlen(fc); | |
65 | if (hdrlen > skb->len) | |
66 | hdrlen = skb->len; | |
67 | if (hdrlen >= 4) | |
68 | printk(" FC=0x%04x DUR=0x%04x", | |
69 | fc, le16_to_cpu(hdr->duration_id)); | |
70 | if (hdrlen >= 10) | |
71 | printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1)); | |
72 | if (hdrlen >= 16) | |
73 | printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2)); | |
74 | if (hdrlen >= 24) | |
75 | printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3)); | |
76 | if (hdrlen >= 30) | |
77 | printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4)); | |
78 | printk("\n"); | |
79 | } | |
80 | #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
81 | static inline void ieee80211_dump_frame(const char *ifname, const char *title, | |
82 | struct sk_buff *skb) | |
83 | { | |
84 | } | |
85 | #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
86 | ||
87 | static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr, | |
88 | int next_frag_len) | |
89 | { | |
90 | int rate, mrate, erp, dur, i; | |
91 | struct ieee80211_rate *txrate = tx->u.tx.rate; | |
92 | struct ieee80211_local *local = tx->local; | |
93 | struct ieee80211_hw_mode *mode = tx->u.tx.mode; | |
94 | ||
95 | erp = txrate->flags & IEEE80211_RATE_ERP; | |
96 | ||
97 | /* | |
98 | * data and mgmt (except PS Poll): | |
99 | * - during CFP: 32768 | |
100 | * - during contention period: | |
101 | * if addr1 is group address: 0 | |
102 | * if more fragments = 0 and addr1 is individual address: time to | |
103 | * transmit one ACK plus SIFS | |
104 | * if more fragments = 1 and addr1 is individual address: time to | |
105 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
106 | * | |
107 | * IEEE 802.11, 9.6: | |
108 | * - control response frame (CTS or ACK) shall be transmitted using the | |
109 | * same rate as the immediately previous frame in the frame exchange | |
110 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
111 | * at the highest possible rate belonging to the PHY rates in the | |
112 | * BSSBasicRateSet | |
113 | */ | |
114 | ||
115 | if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) { | |
116 | /* TODO: These control frames are not currently sent by | |
117 | * 80211.o, but should they be implemented, this function | |
118 | * needs to be updated to support duration field calculation. | |
119 | * | |
120 | * RTS: time needed to transmit pending data/mgmt frame plus | |
121 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
122 | * CTS: duration of immediately previous RTS minus time | |
123 | * required to transmit CTS and its SIFS | |
124 | * ACK: 0 if immediately previous directed data/mgmt had | |
125 | * more=0, with more=1 duration in ACK frame is duration | |
126 | * from previous frame minus time needed to transmit ACK | |
127 | * and its SIFS | |
128 | * PS Poll: BIT(15) | BIT(14) | aid | |
129 | */ | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /* data/mgmt */ | |
134 | if (0 /* FIX: data/mgmt during CFP */) | |
135 | return 32768; | |
136 | ||
137 | if (group_addr) /* Group address as the destination - no ACK */ | |
138 | return 0; | |
139 | ||
140 | /* Individual destination address: | |
141 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
142 | * CTS and ACK frames shall be transmitted using the highest rate in | |
143 | * basic rate set that is less than or equal to the rate of the | |
144 | * immediately previous frame and that is using the same modulation | |
145 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
146 | * the highest mandatory rate of the PHY that is less than or equal to | |
147 | * the rate of the previous frame is used. | |
148 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
149 | */ | |
150 | rate = -1; | |
151 | mrate = 10; /* use 1 Mbps if everything fails */ | |
152 | for (i = 0; i < mode->num_rates; i++) { | |
153 | struct ieee80211_rate *r = &mode->rates[i]; | |
154 | if (r->rate > txrate->rate) | |
155 | break; | |
156 | ||
157 | if (IEEE80211_RATE_MODULATION(txrate->flags) != | |
158 | IEEE80211_RATE_MODULATION(r->flags)) | |
159 | continue; | |
160 | ||
161 | if (r->flags & IEEE80211_RATE_BASIC) | |
162 | rate = r->rate; | |
163 | else if (r->flags & IEEE80211_RATE_MANDATORY) | |
164 | mrate = r->rate; | |
165 | } | |
166 | if (rate == -1) { | |
167 | /* No matching basic rate found; use highest suitable mandatory | |
168 | * PHY rate */ | |
169 | rate = mrate; | |
170 | } | |
171 | ||
172 | /* Time needed to transmit ACK | |
173 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
174 | * to closest integer */ | |
175 | ||
176 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
13262ffd | 177 | tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE); |
e2ebc74d JB |
178 | |
179 | if (next_frag_len) { | |
180 | /* Frame is fragmented: duration increases with time needed to | |
181 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
182 | dur *= 2; /* ACK + SIFS */ | |
183 | /* next fragment */ | |
184 | dur += ieee80211_frame_duration(local, next_frag_len, | |
13262ffd JS |
185 | txrate->rate, erp, |
186 | tx->sdata->flags & | |
187 | IEEE80211_SDATA_SHORT_PREAMBLE); | |
e2ebc74d JB |
188 | } |
189 | ||
190 | return dur; | |
191 | } | |
192 | ||
193 | static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local, | |
194 | int queue) | |
195 | { | |
196 | return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]); | |
197 | } | |
198 | ||
199 | static inline int __ieee80211_queue_pending(const struct ieee80211_local *local, | |
200 | int queue) | |
201 | { | |
202 | return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]); | |
203 | } | |
204 | ||
205 | static int inline is_ieee80211_device(struct net_device *dev, | |
206 | struct net_device *master) | |
207 | { | |
208 | return (wdev_priv(dev->ieee80211_ptr) == | |
209 | wdev_priv(master->ieee80211_ptr)); | |
210 | } | |
211 | ||
212 | /* tx handlers */ | |
213 | ||
214 | static ieee80211_txrx_result | |
215 | ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx) | |
216 | { | |
217 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
218 | struct sk_buff *skb = tx->skb; | |
219 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
220 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
221 | u32 sta_flags; | |
222 | ||
223 | if (unlikely(tx->local->sta_scanning != 0) && | |
224 | ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
225 | (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ)) | |
226 | return TXRX_DROP; | |
227 | ||
badffb72 | 228 | if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED) |
e2ebc74d JB |
229 | return TXRX_CONTINUE; |
230 | ||
231 | sta_flags = tx->sta ? tx->sta->flags : 0; | |
232 | ||
badffb72 | 233 | if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) { |
e2ebc74d JB |
234 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
235 | tx->sdata->type != IEEE80211_IF_TYPE_IBSS && | |
236 | (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) { | |
237 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
238 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
239 | "associated station " MAC_FMT "\n", | |
240 | tx->dev->name, MAC_ARG(hdr->addr1)); | |
241 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
242 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
243 | return TXRX_DROP; | |
244 | } | |
245 | } else { | |
246 | if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
247 | tx->local->num_sta == 0 && | |
e2ebc74d JB |
248 | tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) { |
249 | /* | |
250 | * No associated STAs - no need to send multicast | |
251 | * frames. | |
252 | */ | |
253 | return TXRX_DROP; | |
254 | } | |
255 | return TXRX_CONTINUE; | |
256 | } | |
257 | ||
258 | if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x && | |
259 | !(sta_flags & WLAN_STA_AUTHORIZED))) { | |
260 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
261 | printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT | |
262 | " (unauthorized port)\n", tx->dev->name, | |
263 | MAC_ARG(hdr->addr1)); | |
264 | #endif | |
265 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port); | |
266 | return TXRX_DROP; | |
267 | } | |
268 | ||
269 | return TXRX_CONTINUE; | |
270 | } | |
271 | ||
272 | static ieee80211_txrx_result | |
273 | ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx) | |
274 | { | |
275 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
276 | ||
277 | if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24) | |
278 | ieee80211_include_sequence(tx->sdata, hdr); | |
279 | ||
280 | return TXRX_CONTINUE; | |
281 | } | |
282 | ||
283 | /* This function is called whenever the AP is about to exceed the maximum limit | |
284 | * of buffered frames for power saving STAs. This situation should not really | |
285 | * happen often during normal operation, so dropping the oldest buffered packet | |
286 | * from each queue should be OK to make some room for new frames. */ | |
287 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
288 | { | |
289 | int total = 0, purged = 0; | |
290 | struct sk_buff *skb; | |
291 | struct ieee80211_sub_if_data *sdata; | |
292 | struct sta_info *sta; | |
293 | ||
294 | read_lock(&local->sub_if_lock); | |
295 | list_for_each_entry(sdata, &local->sub_if_list, list) { | |
296 | struct ieee80211_if_ap *ap; | |
297 | if (sdata->dev == local->mdev || | |
298 | sdata->type != IEEE80211_IF_TYPE_AP) | |
299 | continue; | |
300 | ap = &sdata->u.ap; | |
301 | skb = skb_dequeue(&ap->ps_bc_buf); | |
302 | if (skb) { | |
303 | purged++; | |
304 | dev_kfree_skb(skb); | |
305 | } | |
306 | total += skb_queue_len(&ap->ps_bc_buf); | |
307 | } | |
308 | read_unlock(&local->sub_if_lock); | |
309 | ||
be8755e1 | 310 | read_lock_bh(&local->sta_lock); |
e2ebc74d JB |
311 | list_for_each_entry(sta, &local->sta_list, list) { |
312 | skb = skb_dequeue(&sta->ps_tx_buf); | |
313 | if (skb) { | |
314 | purged++; | |
315 | dev_kfree_skb(skb); | |
316 | } | |
317 | total += skb_queue_len(&sta->ps_tx_buf); | |
318 | } | |
be8755e1 | 319 | read_unlock_bh(&local->sta_lock); |
e2ebc74d JB |
320 | |
321 | local->total_ps_buffered = total; | |
322 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", | |
323 | local->mdev->name, purged); | |
324 | } | |
325 | ||
326 | static inline ieee80211_txrx_result | |
327 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx) | |
328 | { | |
329 | /* broadcast/multicast frame */ | |
330 | /* If any of the associated stations is in power save mode, | |
331 | * the frame is buffered to be sent after DTIM beacon frame */ | |
332 | if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) && | |
333 | tx->sdata->type != IEEE80211_IF_TYPE_WDS && | |
334 | tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) && | |
335 | !(tx->fc & IEEE80211_FCTL_ORDER)) { | |
336 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) | |
337 | purge_old_ps_buffers(tx->local); | |
338 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
339 | AP_MAX_BC_BUFFER) { | |
340 | if (net_ratelimit()) { | |
341 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
342 | "dropping the oldest frame\n", | |
343 | tx->dev->name); | |
344 | } | |
345 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); | |
346 | } else | |
347 | tx->local->total_ps_buffered++; | |
348 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
349 | return TXRX_QUEUED; | |
350 | } | |
351 | ||
352 | return TXRX_CONTINUE; | |
353 | } | |
354 | ||
355 | static inline ieee80211_txrx_result | |
356 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx) | |
357 | { | |
358 | struct sta_info *sta = tx->sta; | |
359 | ||
360 | if (unlikely(!sta || | |
361 | ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && | |
362 | (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) | |
363 | return TXRX_CONTINUE; | |
364 | ||
365 | if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) { | |
366 | struct ieee80211_tx_packet_data *pkt_data; | |
367 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
368 | printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries " | |
369 | "before %d)\n", | |
370 | MAC_ARG(sta->addr), sta->aid, | |
371 | skb_queue_len(&sta->ps_tx_buf)); | |
372 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
373 | sta->flags |= WLAN_STA_TIM; | |
374 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) | |
375 | purge_old_ps_buffers(tx->local); | |
376 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
377 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
378 | if (net_ratelimit()) { | |
379 | printk(KERN_DEBUG "%s: STA " MAC_FMT " TX " | |
380 | "buffer full - dropping oldest frame\n", | |
381 | tx->dev->name, MAC_ARG(sta->addr)); | |
382 | } | |
383 | dev_kfree_skb(old); | |
384 | } else | |
385 | tx->local->total_ps_buffered++; | |
386 | /* Queue frame to be sent after STA sends an PS Poll frame */ | |
387 | if (skb_queue_empty(&sta->ps_tx_buf)) { | |
388 | if (tx->local->ops->set_tim) | |
389 | tx->local->ops->set_tim(local_to_hw(tx->local), | |
390 | sta->aid, 1); | |
391 | if (tx->sdata->bss) | |
392 | bss_tim_set(tx->local, tx->sdata->bss, sta->aid); | |
393 | } | |
394 | pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb; | |
395 | pkt_data->jiffies = jiffies; | |
396 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); | |
397 | return TXRX_QUEUED; | |
398 | } | |
399 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
400 | else if (unlikely(sta->flags & WLAN_STA_PS)) { | |
401 | printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll " | |
402 | "set -> send frame\n", tx->dev->name, | |
403 | MAC_ARG(sta->addr)); | |
404 | } | |
405 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
406 | sta->pspoll = 0; | |
407 | ||
408 | return TXRX_CONTINUE; | |
409 | } | |
410 | ||
411 | ||
412 | static ieee80211_txrx_result | |
413 | ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx) | |
414 | { | |
badffb72 | 415 | if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)) |
e2ebc74d JB |
416 | return TXRX_CONTINUE; |
417 | ||
badffb72 | 418 | if (tx->flags & IEEE80211_TXRXD_TXUNICAST) |
e2ebc74d JB |
419 | return ieee80211_tx_h_unicast_ps_buf(tx); |
420 | else | |
421 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
422 | } | |
423 | ||
424 | ||
425 | ||
426 | ||
427 | static ieee80211_txrx_result | |
428 | ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx) | |
429 | { | |
3aefaa32 | 430 | tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID; |
e2ebc74d JB |
431 | |
432 | if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)) | |
433 | tx->key = NULL; | |
434 | else if (tx->sta && tx->sta->key) | |
435 | tx->key = tx->sta->key; | |
436 | else if (tx->sdata->default_key) | |
437 | tx->key = tx->sdata->default_key; | |
438 | else if (tx->sdata->drop_unencrypted && | |
439 | !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) { | |
440 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); | |
441 | return TXRX_DROP; | |
442 | } else | |
443 | tx->key = NULL; | |
444 | ||
445 | if (tx->key) { | |
446 | tx->key->tx_rx_count++; | |
447 | if (unlikely(tx->local->key_tx_rx_threshold && | |
448 | tx->key->tx_rx_count > | |
449 | tx->local->key_tx_rx_threshold)) { | |
450 | ieee80211_key_threshold_notify(tx->dev, tx->key, | |
451 | tx->sta); | |
452 | } | |
453 | } | |
454 | ||
455 | return TXRX_CONTINUE; | |
456 | } | |
457 | ||
458 | static ieee80211_txrx_result | |
459 | ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx) | |
460 | { | |
461 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
462 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; | |
463 | struct sk_buff **frags, *first, *frag; | |
464 | int i; | |
465 | u16 seq; | |
466 | u8 *pos; | |
467 | int frag_threshold = tx->local->fragmentation_threshold; | |
468 | ||
badffb72 | 469 | if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED)) |
e2ebc74d JB |
470 | return TXRX_CONTINUE; |
471 | ||
472 | first = tx->skb; | |
473 | ||
474 | hdrlen = ieee80211_get_hdrlen(tx->fc); | |
475 | payload_len = first->len - hdrlen; | |
476 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
172589cc | 477 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); |
e2ebc74d JB |
478 | |
479 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
480 | if (!frags) | |
481 | goto fail; | |
482 | ||
483 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
484 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
485 | pos = first->data + hdrlen + per_fragm; | |
486 | left = payload_len - per_fragm; | |
487 | for (i = 0; i < num_fragm - 1; i++) { | |
488 | struct ieee80211_hdr *fhdr; | |
489 | size_t copylen; | |
490 | ||
491 | if (left <= 0) | |
492 | goto fail; | |
493 | ||
494 | /* reserve enough extra head and tail room for possible | |
495 | * encryption */ | |
496 | frag = frags[i] = | |
497 | dev_alloc_skb(tx->local->tx_headroom + | |
498 | frag_threshold + | |
499 | IEEE80211_ENCRYPT_HEADROOM + | |
500 | IEEE80211_ENCRYPT_TAILROOM); | |
501 | if (!frag) | |
502 | goto fail; | |
503 | /* Make sure that all fragments use the same priority so | |
504 | * that they end up using the same TX queue */ | |
505 | frag->priority = first->priority; | |
506 | skb_reserve(frag, tx->local->tx_headroom + | |
507 | IEEE80211_ENCRYPT_HEADROOM); | |
508 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
509 | memcpy(fhdr, first->data, hdrlen); | |
510 | if (i == num_fragm - 2) | |
511 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
512 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
513 | copylen = left > per_fragm ? per_fragm : left; | |
514 | memcpy(skb_put(frag, copylen), pos, copylen); | |
515 | ||
516 | pos += copylen; | |
517 | left -= copylen; | |
518 | } | |
519 | skb_trim(first, hdrlen + per_fragm); | |
520 | ||
521 | tx->u.tx.num_extra_frag = num_fragm - 1; | |
522 | tx->u.tx.extra_frag = frags; | |
523 | ||
524 | return TXRX_CONTINUE; | |
525 | ||
526 | fail: | |
527 | printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); | |
528 | if (frags) { | |
529 | for (i = 0; i < num_fragm - 1; i++) | |
530 | if (frags[i]) | |
531 | dev_kfree_skb(frags[i]); | |
532 | kfree(frags); | |
533 | } | |
534 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
535 | return TXRX_DROP; | |
536 | } | |
537 | ||
538 | static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb) | |
539 | { | |
11a843b7 | 540 | if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) { |
e2ebc74d JB |
541 | if (ieee80211_wep_encrypt(tx->local, skb, tx->key)) |
542 | return -1; | |
543 | } else { | |
8f20fc24 | 544 | tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx; |
e2ebc74d JB |
545 | if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) { |
546 | if (ieee80211_wep_add_iv(tx->local, skb, tx->key) == | |
547 | NULL) | |
548 | return -1; | |
549 | } | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static ieee80211_txrx_result | |
555 | ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx) | |
556 | { | |
557 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
558 | u16 fc; | |
559 | ||
560 | fc = le16_to_cpu(hdr->frame_control); | |
561 | ||
8f20fc24 | 562 | if (!tx->key || tx->key->conf.alg != ALG_WEP || |
e2ebc74d JB |
563 | ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && |
564 | ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
565 | (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))) | |
566 | return TXRX_CONTINUE; | |
567 | ||
568 | tx->u.tx.control->iv_len = WEP_IV_LEN; | |
569 | tx->u.tx.control->icv_len = WEP_ICV_LEN; | |
570 | ieee80211_tx_set_iswep(tx); | |
571 | ||
572 | if (wep_encrypt_skb(tx, tx->skb) < 0) { | |
573 | I802_DEBUG_INC(tx->local->tx_handlers_drop_wep); | |
574 | return TXRX_DROP; | |
575 | } | |
576 | ||
577 | if (tx->u.tx.extra_frag) { | |
578 | int i; | |
579 | for (i = 0; i < tx->u.tx.num_extra_frag; i++) { | |
580 | if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) { | |
581 | I802_DEBUG_INC(tx->local-> | |
582 | tx_handlers_drop_wep); | |
583 | return TXRX_DROP; | |
584 | } | |
585 | } | |
586 | } | |
587 | ||
588 | return TXRX_CONTINUE; | |
589 | } | |
590 | ||
591 | static ieee80211_txrx_result | |
592 | ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx) | |
593 | { | |
594 | struct rate_control_extra extra; | |
595 | ||
596 | memset(&extra, 0, sizeof(extra)); | |
597 | extra.mode = tx->u.tx.mode; | |
598 | extra.mgmt_data = tx->sdata && | |
599 | tx->sdata->type == IEEE80211_IF_TYPE_MGMT; | |
600 | extra.ethertype = tx->ethertype; | |
601 | ||
602 | tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb, | |
603 | &extra); | |
604 | if (unlikely(extra.probe != NULL)) { | |
605 | tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
badffb72 | 606 | tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; |
e2ebc74d JB |
607 | tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val; |
608 | tx->u.tx.rate = extra.probe; | |
609 | } else { | |
610 | tx->u.tx.control->alt_retry_rate = -1; | |
611 | } | |
612 | if (!tx->u.tx.rate) | |
613 | return TXRX_DROP; | |
614 | if (tx->u.tx.mode->mode == MODE_IEEE80211G && | |
13262ffd | 615 | (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) && |
badffb72 | 616 | (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) { |
e2ebc74d | 617 | tx->u.tx.last_frag_rate = tx->u.tx.rate; |
badffb72 JS |
618 | if (extra.probe) |
619 | tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG; | |
620 | else | |
621 | tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; | |
e2ebc74d JB |
622 | tx->u.tx.rate = extra.nonerp; |
623 | tx->u.tx.control->rate = extra.nonerp; | |
624 | tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
625 | } else { | |
626 | tx->u.tx.last_frag_rate = tx->u.tx.rate; | |
627 | tx->u.tx.control->rate = tx->u.tx.rate; | |
628 | } | |
629 | tx->u.tx.control->tx_rate = tx->u.tx.rate->val; | |
e2ebc74d JB |
630 | |
631 | return TXRX_CONTINUE; | |
632 | } | |
633 | ||
634 | static ieee80211_txrx_result | |
635 | ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx) | |
636 | { | |
637 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
7e9ed188 | 638 | u16 fc = le16_to_cpu(hdr->frame_control); |
e2ebc74d JB |
639 | u16 dur; |
640 | struct ieee80211_tx_control *control = tx->u.tx.control; | |
641 | struct ieee80211_hw_mode *mode = tx->u.tx.mode; | |
642 | ||
643 | if (!is_multicast_ether_addr(hdr->addr1)) { | |
644 | if (tx->skb->len + FCS_LEN > tx->local->rts_threshold && | |
645 | tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) { | |
646 | control->flags |= IEEE80211_TXCTL_USE_RTS_CTS; | |
d5d08def | 647 | control->flags |= IEEE80211_TXCTL_LONG_RETRY_LIMIT; |
e2ebc74d JB |
648 | control->retry_limit = |
649 | tx->local->long_retry_limit; | |
650 | } else { | |
651 | control->retry_limit = | |
652 | tx->local->short_retry_limit; | |
653 | } | |
654 | } else { | |
655 | control->retry_limit = 1; | |
656 | } | |
657 | ||
badffb72 | 658 | if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) { |
e2ebc74d JB |
659 | /* Do not use multiple retry rates when sending fragmented |
660 | * frames. | |
661 | * TODO: The last fragment could still use multiple retry | |
662 | * rates. */ | |
663 | control->alt_retry_rate = -1; | |
664 | } | |
665 | ||
666 | /* Use CTS protection for unicast frames sent using extended rates if | |
667 | * there are associated non-ERP stations and RTS/CTS is not configured | |
668 | * for the frame. */ | |
669 | if (mode->mode == MODE_IEEE80211G && | |
670 | (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) && | |
badffb72 | 671 | (tx->flags & IEEE80211_TXRXD_TXUNICAST) && |
13262ffd | 672 | (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) && |
e2ebc74d JB |
673 | !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS)) |
674 | control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT; | |
675 | ||
7e9ed188 DD |
676 | /* Transmit data frames using short preambles if the driver supports |
677 | * short preambles at the selected rate and short preambles are | |
678 | * available on the network at the current point in time. */ | |
679 | if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
680 | (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) && | |
13262ffd | 681 | (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) && |
7e9ed188 DD |
682 | (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) { |
683 | tx->u.tx.control->tx_rate = tx->u.tx.rate->val2; | |
684 | } | |
685 | ||
e2ebc74d JB |
686 | /* Setup duration field for the first fragment of the frame. Duration |
687 | * for remaining fragments will be updated when they are being sent | |
688 | * to low-level driver in ieee80211_tx(). */ | |
689 | dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1), | |
badffb72 JS |
690 | (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ? |
691 | tx->u.tx.extra_frag[0]->len : 0); | |
e2ebc74d JB |
692 | hdr->duration_id = cpu_to_le16(dur); |
693 | ||
694 | if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) || | |
695 | (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) { | |
696 | struct ieee80211_rate *rate; | |
697 | ||
698 | /* Do not use multiple retry rates when using RTS/CTS */ | |
699 | control->alt_retry_rate = -1; | |
700 | ||
701 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
702 | rate = tx->u.tx.rate; | |
703 | while (rate > mode->rates && | |
704 | !(rate->flags & IEEE80211_RATE_BASIC)) | |
705 | rate--; | |
706 | ||
707 | control->rts_cts_rate = rate->val; | |
708 | control->rts_rate = rate; | |
709 | } | |
710 | ||
711 | if (tx->sta) { | |
712 | tx->sta->tx_packets++; | |
713 | tx->sta->tx_fragments++; | |
714 | tx->sta->tx_bytes += tx->skb->len; | |
715 | if (tx->u.tx.extra_frag) { | |
716 | int i; | |
717 | tx->sta->tx_fragments += tx->u.tx.num_extra_frag; | |
718 | for (i = 0; i < tx->u.tx.num_extra_frag; i++) { | |
719 | tx->sta->tx_bytes += | |
720 | tx->u.tx.extra_frag[i]->len; | |
721 | } | |
722 | } | |
723 | } | |
724 | ||
725 | return TXRX_CONTINUE; | |
726 | } | |
727 | ||
728 | static ieee80211_txrx_result | |
729 | ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx) | |
730 | { | |
731 | struct ieee80211_local *local = tx->local; | |
732 | struct ieee80211_hw_mode *mode = tx->u.tx.mode; | |
733 | struct sk_buff *skb = tx->skb; | |
734 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
735 | u32 load = 0, hdrtime; | |
736 | ||
737 | /* TODO: this could be part of tx_status handling, so that the number | |
738 | * of retries would be known; TX rate should in that case be stored | |
739 | * somewhere with the packet */ | |
740 | ||
741 | /* Estimate total channel use caused by this frame */ | |
742 | ||
743 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
744 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
745 | ||
746 | if (mode->mode == MODE_IEEE80211A || | |
747 | mode->mode == MODE_ATHEROS_TURBO || | |
748 | mode->mode == MODE_ATHEROS_TURBOG || | |
749 | (mode->mode == MODE_IEEE80211G && | |
750 | tx->u.tx.rate->flags & IEEE80211_RATE_ERP)) | |
751 | hdrtime = CHAN_UTIL_HDR_SHORT; | |
752 | else | |
753 | hdrtime = CHAN_UTIL_HDR_LONG; | |
754 | ||
755 | load = hdrtime; | |
756 | if (!is_multicast_ether_addr(hdr->addr1)) | |
757 | load += hdrtime; | |
758 | ||
759 | if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS) | |
760 | load += 2 * hdrtime; | |
761 | else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) | |
762 | load += hdrtime; | |
763 | ||
764 | load += skb->len * tx->u.tx.rate->rate_inv; | |
765 | ||
766 | if (tx->u.tx.extra_frag) { | |
767 | int i; | |
768 | for (i = 0; i < tx->u.tx.num_extra_frag; i++) { | |
769 | load += 2 * hdrtime; | |
770 | load += tx->u.tx.extra_frag[i]->len * | |
771 | tx->u.tx.rate->rate; | |
772 | } | |
773 | } | |
774 | ||
775 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
776 | load >>= CHAN_UTIL_SHIFT; | |
777 | local->channel_use_raw += load; | |
778 | if (tx->sta) | |
779 | tx->sta->channel_use_raw += load; | |
780 | tx->sdata->channel_use_raw += load; | |
781 | ||
782 | return TXRX_CONTINUE; | |
783 | } | |
784 | ||
785 | /* TODO: implement register/unregister functions for adding TX/RX handlers | |
786 | * into ordered list */ | |
787 | ||
788 | ieee80211_tx_handler ieee80211_tx_handlers[] = | |
789 | { | |
790 | ieee80211_tx_h_check_assoc, | |
791 | ieee80211_tx_h_sequence, | |
792 | ieee80211_tx_h_ps_buf, | |
793 | ieee80211_tx_h_select_key, | |
794 | ieee80211_tx_h_michael_mic_add, | |
795 | ieee80211_tx_h_fragment, | |
796 | ieee80211_tx_h_tkip_encrypt, | |
797 | ieee80211_tx_h_ccmp_encrypt, | |
798 | ieee80211_tx_h_wep_encrypt, | |
799 | ieee80211_tx_h_rate_ctrl, | |
800 | ieee80211_tx_h_misc, | |
801 | ieee80211_tx_h_load_stats, | |
802 | NULL | |
803 | }; | |
804 | ||
805 | /* actual transmit path */ | |
806 | ||
807 | /* | |
808 | * deal with packet injection down monitor interface | |
809 | * with Radiotap Header -- only called for monitor mode interface | |
810 | */ | |
811 | static ieee80211_txrx_result | |
812 | __ieee80211_parse_tx_radiotap( | |
813 | struct ieee80211_txrx_data *tx, | |
814 | struct sk_buff *skb, struct ieee80211_tx_control *control) | |
815 | { | |
816 | /* | |
817 | * this is the moment to interpret and discard the radiotap header that | |
818 | * must be at the start of the packet injected in Monitor mode | |
819 | * | |
820 | * Need to take some care with endian-ness since radiotap | |
821 | * args are little-endian | |
822 | */ | |
823 | ||
824 | struct ieee80211_radiotap_iterator iterator; | |
825 | struct ieee80211_radiotap_header *rthdr = | |
826 | (struct ieee80211_radiotap_header *) skb->data; | |
827 | struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode; | |
828 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); | |
829 | ||
830 | /* | |
831 | * default control situation for all injected packets | |
832 | * FIXME: this does not suit all usage cases, expand to allow control | |
833 | */ | |
834 | ||
835 | control->retry_limit = 1; /* no retry */ | |
11a843b7 | 836 | control->key_idx = HW_KEY_IDX_INVALID; |
e2ebc74d JB |
837 | control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS | |
838 | IEEE80211_TXCTL_USE_CTS_PROTECT); | |
839 | control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT | | |
840 | IEEE80211_TXCTL_NO_ACK; | |
841 | control->antenna_sel_tx = 0; /* default to default antenna */ | |
842 | ||
843 | /* | |
844 | * for every radiotap entry that is present | |
845 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
846 | * entries present, or -EINVAL on error) | |
847 | */ | |
848 | ||
849 | while (!ret) { | |
850 | int i, target_rate; | |
851 | ||
852 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
853 | ||
854 | if (ret) | |
855 | continue; | |
856 | ||
857 | /* see if this argument is something we can use */ | |
858 | switch (iterator.this_arg_index) { | |
859 | /* | |
860 | * You must take care when dereferencing iterator.this_arg | |
861 | * for multibyte types... the pointer is not aligned. Use | |
862 | * get_unaligned((type *)iterator.this_arg) to dereference | |
863 | * iterator.this_arg for type "type" safely on all arches. | |
864 | */ | |
865 | case IEEE80211_RADIOTAP_RATE: | |
866 | /* | |
867 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
868 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
869 | */ | |
870 | target_rate = (*iterator.this_arg) * 5; | |
871 | for (i = 0; i < mode->num_rates; i++) { | |
872 | struct ieee80211_rate *r = &mode->rates[i]; | |
873 | ||
874 | if (r->rate > target_rate) | |
875 | continue; | |
876 | ||
877 | control->rate = r; | |
878 | ||
879 | if (r->flags & IEEE80211_RATE_PREAMBLE2) | |
880 | control->tx_rate = r->val2; | |
881 | else | |
882 | control->tx_rate = r->val; | |
883 | ||
884 | /* end on exact match */ | |
885 | if (r->rate == target_rate) | |
886 | i = mode->num_rates; | |
887 | } | |
888 | break; | |
889 | ||
890 | case IEEE80211_RADIOTAP_ANTENNA: | |
891 | /* | |
892 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
893 | * 1st ant | |
894 | */ | |
895 | control->antenna_sel_tx = (*iterator.this_arg) + 1; | |
896 | break; | |
897 | ||
898 | case IEEE80211_RADIOTAP_DBM_TX_POWER: | |
899 | control->power_level = *iterator.this_arg; | |
900 | break; | |
901 | ||
902 | case IEEE80211_RADIOTAP_FLAGS: | |
903 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
904 | /* | |
905 | * this indicates that the skb we have been | |
906 | * handed has the 32-bit FCS CRC at the end... | |
907 | * we should react to that by snipping it off | |
908 | * because it will be recomputed and added | |
909 | * on transmission | |
910 | */ | |
911 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
912 | return TXRX_DROP; | |
913 | ||
914 | skb_trim(skb, skb->len - FCS_LEN); | |
915 | } | |
916 | break; | |
917 | ||
918 | default: | |
919 | break; | |
920 | } | |
921 | } | |
922 | ||
923 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
924 | return TXRX_DROP; | |
925 | ||
926 | /* | |
927 | * remove the radiotap header | |
928 | * iterator->max_length was sanity-checked against | |
929 | * skb->len by iterator init | |
930 | */ | |
931 | skb_pull(skb, iterator.max_length); | |
932 | ||
933 | return TXRX_CONTINUE; | |
934 | } | |
935 | ||
936 | static ieee80211_txrx_result inline | |
937 | __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx, | |
938 | struct sk_buff *skb, | |
939 | struct net_device *dev, | |
940 | struct ieee80211_tx_control *control) | |
941 | { | |
942 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
943 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
944 | struct ieee80211_sub_if_data *sdata; | |
945 | ieee80211_txrx_result res = TXRX_CONTINUE; | |
946 | ||
947 | int hdrlen; | |
948 | ||
949 | memset(tx, 0, sizeof(*tx)); | |
950 | tx->skb = skb; | |
951 | tx->dev = dev; /* use original interface */ | |
952 | tx->local = local; | |
953 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
954 | tx->sta = sta_info_get(local, hdr->addr1); | |
955 | tx->fc = le16_to_cpu(hdr->frame_control); | |
956 | ||
957 | /* | |
958 | * set defaults for things that can be set by | |
959 | * injected radiotap headers | |
960 | */ | |
961 | control->power_level = local->hw.conf.power_level; | |
962 | control->antenna_sel_tx = local->hw.conf.antenna_sel_tx; | |
e2ebc74d JB |
963 | |
964 | /* process and remove the injection radiotap header */ | |
965 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
966 | if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) { | |
967 | if (__ieee80211_parse_tx_radiotap(tx, skb, control) == | |
968 | TXRX_DROP) { | |
969 | return TXRX_DROP; | |
970 | } | |
971 | /* | |
972 | * we removed the radiotap header after this point, | |
973 | * we filled control with what we could use | |
974 | * set to the actual ieee header now | |
975 | */ | |
976 | hdr = (struct ieee80211_hdr *) skb->data; | |
977 | res = TXRX_QUEUED; /* indication it was monitor packet */ | |
978 | } | |
979 | ||
980 | tx->u.tx.control = control; | |
badffb72 JS |
981 | if (is_multicast_ether_addr(hdr->addr1)) { |
982 | tx->flags &= ~IEEE80211_TXRXD_TXUNICAST; | |
e2ebc74d | 983 | control->flags |= IEEE80211_TXCTL_NO_ACK; |
badffb72 JS |
984 | } else { |
985 | tx->flags |= IEEE80211_TXRXD_TXUNICAST; | |
e2ebc74d | 986 | control->flags &= ~IEEE80211_TXCTL_NO_ACK; |
badffb72 JS |
987 | } |
988 | if (local->fragmentation_threshold < IEEE80211_MAX_FRAG_THRESHOLD && | |
989 | (tx->flags & IEEE80211_TXRXD_TXUNICAST) && | |
990 | skb->len + FCS_LEN > local->fragmentation_threshold && | |
991 | !local->ops->set_frag_threshold) | |
992 | tx->flags |= IEEE80211_TXRXD_FRAGMENTED; | |
993 | else | |
994 | tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED; | |
e2ebc74d JB |
995 | if (!tx->sta) |
996 | control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK; | |
997 | else if (tx->sta->clear_dst_mask) { | |
998 | control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK; | |
999 | tx->sta->clear_dst_mask = 0; | |
1000 | } | |
1001 | hdrlen = ieee80211_get_hdrlen(tx->fc); | |
1002 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { | |
1003 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1004 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1005 | } | |
1006 | control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT; | |
1007 | ||
1008 | return res; | |
1009 | } | |
1010 | ||
1011 | /* Device in tx->dev has a reference added; use dev_put(tx->dev) when | |
1012 | * finished with it. */ | |
1013 | static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx, | |
1014 | struct sk_buff *skb, | |
1015 | struct net_device *mdev, | |
1016 | struct ieee80211_tx_control *control) | |
1017 | { | |
1018 | struct ieee80211_tx_packet_data *pkt_data; | |
1019 | struct net_device *dev; | |
1020 | ||
1021 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
881d966b | 1022 | dev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1023 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1024 | dev_put(dev); | |
1025 | dev = NULL; | |
1026 | } | |
1027 | if (unlikely(!dev)) | |
1028 | return -ENODEV; | |
1029 | __ieee80211_tx_prepare(tx, skb, dev, control); | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
1034 | struct ieee80211_txrx_data *tx) | |
1035 | { | |
1036 | struct ieee80211_tx_control *control = tx->u.tx.control; | |
1037 | int ret, i; | |
1038 | ||
1039 | if (!ieee80211_qdisc_installed(local->mdev) && | |
1040 | __ieee80211_queue_stopped(local, 0)) { | |
1041 | netif_stop_queue(local->mdev); | |
1042 | return IEEE80211_TX_AGAIN; | |
1043 | } | |
1044 | if (skb) { | |
1045 | ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb); | |
1046 | ret = local->ops->tx(local_to_hw(local), skb, control); | |
1047 | if (ret) | |
1048 | return IEEE80211_TX_AGAIN; | |
1049 | local->mdev->trans_start = jiffies; | |
1050 | ieee80211_led_tx(local, 1); | |
1051 | } | |
1052 | if (tx->u.tx.extra_frag) { | |
1053 | control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS | | |
1054 | IEEE80211_TXCTL_USE_CTS_PROTECT | | |
1055 | IEEE80211_TXCTL_CLEAR_DST_MASK | | |
1056 | IEEE80211_TXCTL_FIRST_FRAGMENT); | |
1057 | for (i = 0; i < tx->u.tx.num_extra_frag; i++) { | |
1058 | if (!tx->u.tx.extra_frag[i]) | |
1059 | continue; | |
1060 | if (__ieee80211_queue_stopped(local, control->queue)) | |
1061 | return IEEE80211_TX_FRAG_AGAIN; | |
1062 | if (i == tx->u.tx.num_extra_frag) { | |
1063 | control->tx_rate = tx->u.tx.last_frag_hwrate; | |
1064 | control->rate = tx->u.tx.last_frag_rate; | |
badffb72 | 1065 | if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG) |
e2ebc74d JB |
1066 | control->flags |= |
1067 | IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1068 | else | |
1069 | control->flags &= | |
1070 | ~IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1071 | } | |
1072 | ||
1073 | ieee80211_dump_frame(local->mdev->name, | |
1074 | "TX to low-level driver", | |
1075 | tx->u.tx.extra_frag[i]); | |
1076 | ret = local->ops->tx(local_to_hw(local), | |
1077 | tx->u.tx.extra_frag[i], | |
1078 | control); | |
1079 | if (ret) | |
1080 | return IEEE80211_TX_FRAG_AGAIN; | |
1081 | local->mdev->trans_start = jiffies; | |
1082 | ieee80211_led_tx(local, 1); | |
1083 | tx->u.tx.extra_frag[i] = NULL; | |
1084 | } | |
1085 | kfree(tx->u.tx.extra_frag); | |
1086 | tx->u.tx.extra_frag = NULL; | |
1087 | } | |
1088 | return IEEE80211_TX_OK; | |
1089 | } | |
1090 | ||
1091 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb, | |
1092 | struct ieee80211_tx_control *control, int mgmt) | |
1093 | { | |
1094 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1095 | struct sta_info *sta; | |
1096 | ieee80211_tx_handler *handler; | |
1097 | struct ieee80211_txrx_data tx; | |
1098 | ieee80211_txrx_result res = TXRX_DROP, res_prepare; | |
1099 | int ret, i; | |
1100 | ||
1101 | WARN_ON(__ieee80211_queue_pending(local, control->queue)); | |
1102 | ||
1103 | if (unlikely(skb->len < 10)) { | |
1104 | dev_kfree_skb(skb); | |
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control); | |
1109 | ||
1110 | if (res_prepare == TXRX_DROP) { | |
1111 | dev_kfree_skb(skb); | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | sta = tx.sta; | |
1116 | tx.u.tx.mgmt_interface = mgmt; | |
1117 | tx.u.tx.mode = local->hw.conf.mode; | |
1118 | ||
1119 | if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */ | |
1120 | res = TXRX_CONTINUE; | |
1121 | } else { | |
1122 | for (handler = local->tx_handlers; *handler != NULL; | |
1123 | handler++) { | |
1124 | res = (*handler)(&tx); | |
1125 | if (res != TXRX_CONTINUE) | |
1126 | break; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | skb = tx.skb; /* handlers are allowed to change skb */ | |
1131 | ||
1132 | if (sta) | |
1133 | sta_info_put(sta); | |
1134 | ||
1135 | if (unlikely(res == TXRX_DROP)) { | |
1136 | I802_DEBUG_INC(local->tx_handlers_drop); | |
1137 | goto drop; | |
1138 | } | |
1139 | ||
1140 | if (unlikely(res == TXRX_QUEUED)) { | |
1141 | I802_DEBUG_INC(local->tx_handlers_queued); | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | if (tx.u.tx.extra_frag) { | |
1146 | for (i = 0; i < tx.u.tx.num_extra_frag; i++) { | |
1147 | int next_len, dur; | |
1148 | struct ieee80211_hdr *hdr = | |
1149 | (struct ieee80211_hdr *) | |
1150 | tx.u.tx.extra_frag[i]->data; | |
1151 | ||
1152 | if (i + 1 < tx.u.tx.num_extra_frag) { | |
1153 | next_len = tx.u.tx.extra_frag[i + 1]->len; | |
1154 | } else { | |
1155 | next_len = 0; | |
1156 | tx.u.tx.rate = tx.u.tx.last_frag_rate; | |
1157 | tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val; | |
1158 | } | |
1159 | dur = ieee80211_duration(&tx, 0, next_len); | |
1160 | hdr->duration_id = cpu_to_le16(dur); | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | retry: | |
1165 | ret = __ieee80211_tx(local, skb, &tx); | |
1166 | if (ret) { | |
1167 | struct ieee80211_tx_stored_packet *store = | |
1168 | &local->pending_packet[control->queue]; | |
1169 | ||
1170 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1171 | skb = NULL; | |
1172 | set_bit(IEEE80211_LINK_STATE_PENDING, | |
1173 | &local->state[control->queue]); | |
1174 | smp_mb(); | |
1175 | /* When the driver gets out of buffers during sending of | |
1176 | * fragments and calls ieee80211_stop_queue, there is | |
1177 | * a small window between IEEE80211_LINK_STATE_XOFF and | |
1178 | * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer | |
1179 | * gets available in that window (i.e. driver calls | |
1180 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
1181 | * called with IEEE80211_LINK_STATE_PENDING. Prevent this by | |
1182 | * continuing transmitting here when that situation is | |
1183 | * possible to have happened. */ | |
1184 | if (!__ieee80211_queue_stopped(local, control->queue)) { | |
1185 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1186 | &local->state[control->queue]); | |
1187 | goto retry; | |
1188 | } | |
1189 | memcpy(&store->control, control, | |
1190 | sizeof(struct ieee80211_tx_control)); | |
1191 | store->skb = skb; | |
1192 | store->extra_frag = tx.u.tx.extra_frag; | |
1193 | store->num_extra_frag = tx.u.tx.num_extra_frag; | |
1194 | store->last_frag_hwrate = tx.u.tx.last_frag_hwrate; | |
1195 | store->last_frag_rate = tx.u.tx.last_frag_rate; | |
badffb72 JS |
1196 | store->last_frag_rate_ctrl_probe = |
1197 | !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG); | |
e2ebc74d JB |
1198 | } |
1199 | return 0; | |
1200 | ||
1201 | drop: | |
1202 | if (skb) | |
1203 | dev_kfree_skb(skb); | |
1204 | for (i = 0; i < tx.u.tx.num_extra_frag; i++) | |
1205 | if (tx.u.tx.extra_frag[i]) | |
1206 | dev_kfree_skb(tx.u.tx.extra_frag[i]); | |
1207 | kfree(tx.u.tx.extra_frag); | |
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | /* device xmit handlers */ | |
1212 | ||
1213 | int ieee80211_master_start_xmit(struct sk_buff *skb, | |
1214 | struct net_device *dev) | |
1215 | { | |
1216 | struct ieee80211_tx_control control; | |
1217 | struct ieee80211_tx_packet_data *pkt_data; | |
1218 | struct net_device *odev = NULL; | |
1219 | struct ieee80211_sub_if_data *osdata; | |
1220 | int headroom; | |
1221 | int ret; | |
1222 | ||
1223 | /* | |
1224 | * copy control out of the skb so other people can use skb->cb | |
1225 | */ | |
1226 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1227 | memset(&control, 0, sizeof(struct ieee80211_tx_control)); | |
1228 | ||
1229 | if (pkt_data->ifindex) | |
881d966b | 1230 | odev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1231 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1232 | dev_put(odev); | |
1233 | odev = NULL; | |
1234 | } | |
1235 | if (unlikely(!odev)) { | |
1236 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1237 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1238 | "originating device\n", dev->name); | |
1239 | #endif | |
1240 | dev_kfree_skb(skb); | |
1241 | return 0; | |
1242 | } | |
1243 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); | |
1244 | ||
1245 | headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM; | |
1246 | if (skb_headroom(skb) < headroom) { | |
1247 | if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { | |
1248 | dev_kfree_skb(skb); | |
1249 | dev_put(odev); | |
1250 | return 0; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | control.ifindex = odev->ifindex; | |
1255 | control.type = osdata->type; | |
e8bf9649 | 1256 | if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS) |
e2ebc74d | 1257 | control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS; |
e8bf9649 | 1258 | if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT) |
e2ebc74d | 1259 | control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
e8bf9649 | 1260 | if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) |
e2ebc74d JB |
1261 | control.flags |= IEEE80211_TXCTL_REQUEUE; |
1262 | control.queue = pkt_data->queue; | |
1263 | ||
1264 | ret = ieee80211_tx(odev, skb, &control, | |
1265 | control.type == IEEE80211_IF_TYPE_MGMT); | |
1266 | dev_put(odev); | |
1267 | ||
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1272 | struct net_device *dev) | |
1273 | { | |
1274 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1275 | struct ieee80211_tx_packet_data *pkt_data; | |
1276 | struct ieee80211_radiotap_header *prthdr = | |
1277 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1278 | u16 len_rthdr; |
e2ebc74d | 1279 | |
9b8a74e3 AG |
1280 | /* check for not even having the fixed radiotap header part */ |
1281 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1282 | goto fail; /* too short to be possibly valid */ | |
1283 | ||
1284 | /* is it a header version we can trust to find length from? */ | |
1285 | if (unlikely(prthdr->it_version)) | |
1286 | goto fail; /* only version 0 is supported */ | |
1287 | ||
1288 | /* then there must be a radiotap header with a length we can use */ | |
1289 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1290 | ||
1291 | /* does the skb contain enough to deliver on the alleged length? */ | |
1292 | if (unlikely(skb->len < len_rthdr)) | |
1293 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1294 | |
1295 | skb->dev = local->mdev; | |
1296 | ||
1297 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1298 | memset(pkt_data, 0, sizeof(*pkt_data)); | |
9b8a74e3 | 1299 | /* needed because we set skb device to master */ |
e2ebc74d | 1300 | pkt_data->ifindex = dev->ifindex; |
9b8a74e3 | 1301 | |
e8bf9649 | 1302 | pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT; |
e2ebc74d | 1303 | |
e2ebc74d JB |
1304 | /* |
1305 | * fix up the pointers accounting for the radiotap | |
1306 | * header still being in there. We are being given | |
1307 | * a precooked IEEE80211 header so no need for | |
1308 | * normal processing | |
1309 | */ | |
9b8a74e3 | 1310 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1311 | /* |
9b8a74e3 AG |
1312 | * these are just fixed to the end of the rt area since we |
1313 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1314 | */ |
9b8a74e3 AG |
1315 | skb_set_network_header(skb, len_rthdr); |
1316 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1317 | |
9b8a74e3 AG |
1318 | /* pass the radiotap header up to the next stage intact */ |
1319 | dev_queue_xmit(skb); | |
e2ebc74d | 1320 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1321 | |
1322 | fail: | |
1323 | dev_kfree_skb(skb); | |
1324 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1325 | } |
1326 | ||
1327 | /** | |
1328 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1329 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1330 | * @skb: packet to be sent | |
1331 | * @dev: incoming interface | |
1332 | * | |
1333 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1334 | * not be freed, and caller is responsible for either retrying later or freeing | |
1335 | * skb). | |
1336 | * | |
1337 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1338 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1339 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1340 | * transmission (through low-level driver). | |
1341 | */ | |
1342 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1343 | struct net_device *dev) | |
1344 | { | |
1345 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1346 | struct ieee80211_tx_packet_data *pkt_data; | |
1347 | struct ieee80211_sub_if_data *sdata; | |
1348 | int ret = 1, head_need; | |
1349 | u16 ethertype, hdrlen, fc; | |
1350 | struct ieee80211_hdr hdr; | |
1351 | const u8 *encaps_data; | |
1352 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1353 | int nh_pos, h_pos; |
e2ebc74d JB |
1354 | struct sta_info *sta; |
1355 | ||
1356 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1357 | if (unlikely(skb->len < ETH_HLEN)) { | |
1358 | printk(KERN_DEBUG "%s: short skb (len=%d)\n", | |
1359 | dev->name, skb->len); | |
1360 | ret = 0; | |
1361 | goto fail; | |
1362 | } | |
1363 | ||
1364 | nh_pos = skb_network_header(skb) - skb->data; | |
1365 | h_pos = skb_transport_header(skb) - skb->data; | |
1366 | ||
1367 | /* convert Ethernet header to proper 802.11 header (based on | |
1368 | * operation mode) */ | |
1369 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
1370 | /* TODO: handling for 802.1x authorized/unauthorized port */ | |
1371 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; | |
1372 | ||
cf966838 JB |
1373 | switch (sdata->type) { |
1374 | case IEEE80211_IF_TYPE_AP: | |
1375 | case IEEE80211_IF_TYPE_VLAN: | |
e2ebc74d JB |
1376 | fc |= IEEE80211_FCTL_FROMDS; |
1377 | /* DA BSSID SA */ | |
1378 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1379 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1380 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1381 | hdrlen = 24; | |
cf966838 JB |
1382 | break; |
1383 | case IEEE80211_IF_TYPE_WDS: | |
e2ebc74d JB |
1384 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; |
1385 | /* RA TA DA SA */ | |
1386 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1387 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1388 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1389 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1390 | hdrlen = 30; | |
cf966838 JB |
1391 | break; |
1392 | case IEEE80211_IF_TYPE_STA: | |
e2ebc74d JB |
1393 | fc |= IEEE80211_FCTL_TODS; |
1394 | /* BSSID SA DA */ | |
1395 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1396 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1397 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1398 | hdrlen = 24; | |
cf966838 JB |
1399 | break; |
1400 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1401 | /* DA SA BSSID */ |
1402 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1403 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1404 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1405 | hdrlen = 24; | |
cf966838 JB |
1406 | break; |
1407 | default: | |
e2ebc74d JB |
1408 | ret = 0; |
1409 | goto fail; | |
1410 | } | |
1411 | ||
1412 | /* receiver is QoS enabled, use a QoS type frame */ | |
1413 | sta = sta_info_get(local, hdr.addr1); | |
1414 | if (sta) { | |
1415 | if (sta->flags & WLAN_STA_WME) { | |
1416 | fc |= IEEE80211_STYPE_QOS_DATA; | |
1417 | hdrlen += 2; | |
1418 | } | |
1419 | sta_info_put(sta); | |
1420 | } | |
1421 | ||
1422 | hdr.frame_control = cpu_to_le16(fc); | |
1423 | hdr.duration_id = 0; | |
1424 | hdr.seq_ctrl = 0; | |
1425 | ||
1426 | skip_header_bytes = ETH_HLEN; | |
1427 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1428 | encaps_data = bridge_tunnel_header; | |
1429 | encaps_len = sizeof(bridge_tunnel_header); | |
1430 | skip_header_bytes -= 2; | |
1431 | } else if (ethertype >= 0x600) { | |
1432 | encaps_data = rfc1042_header; | |
1433 | encaps_len = sizeof(rfc1042_header); | |
1434 | skip_header_bytes -= 2; | |
1435 | } else { | |
1436 | encaps_data = NULL; | |
1437 | encaps_len = 0; | |
1438 | } | |
1439 | ||
1440 | skb_pull(skb, skip_header_bytes); | |
1441 | nh_pos -= skip_header_bytes; | |
1442 | h_pos -= skip_header_bytes; | |
1443 | ||
1444 | /* TODO: implement support for fragments so that there is no need to | |
1445 | * reallocate and copy payload; it might be enough to support one | |
1446 | * extra fragment that would be copied in the beginning of the frame | |
1447 | * data.. anyway, it would be nice to include this into skb structure | |
1448 | * somehow | |
1449 | * | |
1450 | * There are few options for this: | |
1451 | * use skb->cb as an extra space for 802.11 header | |
1452 | * allocate new buffer if not enough headroom | |
1453 | * make sure that there is enough headroom in every skb by increasing | |
1454 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1455 | * alloc_skb() (net/core/skbuff.c) | |
1456 | */ | |
1457 | head_need = hdrlen + encaps_len + local->tx_headroom; | |
1458 | head_need -= skb_headroom(skb); | |
1459 | ||
1460 | /* We are going to modify skb data, so make a copy of it if happens to | |
1461 | * be cloned. This could happen, e.g., with Linux bridge code passing | |
1462 | * us broadcast frames. */ | |
1463 | ||
1464 | if (head_need > 0 || skb_cloned(skb)) { | |
1465 | #if 0 | |
1466 | printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " | |
1467 | "of headroom\n", dev->name, head_need); | |
1468 | #endif | |
1469 | ||
1470 | if (skb_cloned(skb)) | |
1471 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1472 | else | |
1473 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1474 | /* Since we have to reallocate the buffer, make sure that there | |
1475 | * is enough room for possible WEP IV/ICV and TKIP (8 bytes | |
1476 | * before payload and 12 after). */ | |
1477 | if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8), | |
1478 | 12, GFP_ATOMIC)) { | |
1479 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer" | |
1480 | "\n", dev->name); | |
1481 | goto fail; | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | if (encaps_data) { | |
1486 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1487 | nh_pos += encaps_len; | |
1488 | h_pos += encaps_len; | |
1489 | } | |
c29b9b9b JB |
1490 | |
1491 | if (fc & IEEE80211_STYPE_QOS_DATA) { | |
1492 | __le16 *qos_control; | |
1493 | ||
1494 | qos_control = (__le16*) skb_push(skb, 2); | |
1495 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1496 | /* | |
1497 | * Maybe we could actually set some fields here, for now just | |
1498 | * initialise to zero to indicate no special operation. | |
1499 | */ | |
1500 | *qos_control = 0; | |
1501 | } else | |
1502 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1503 | ||
e2ebc74d JB |
1504 | nh_pos += hdrlen; |
1505 | h_pos += hdrlen; | |
1506 | ||
1507 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1508 | memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); | |
1509 | pkt_data->ifindex = dev->ifindex; | |
e8bf9649 JS |
1510 | if (sdata->type == IEEE80211_IF_TYPE_MGMT) |
1511 | pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE; | |
e2ebc74d JB |
1512 | |
1513 | skb->dev = local->mdev; | |
1514 | sdata->stats.tx_packets++; | |
1515 | sdata->stats.tx_bytes += skb->len; | |
1516 | ||
1517 | /* Update skb pointers to various headers since this modified frame | |
1518 | * is going to go through Linux networking code that may potentially | |
1519 | * need things like pointer to IP header. */ | |
1520 | skb_set_mac_header(skb, 0); | |
1521 | skb_set_network_header(skb, nh_pos); | |
1522 | skb_set_transport_header(skb, h_pos); | |
1523 | ||
1524 | dev->trans_start = jiffies; | |
1525 | dev_queue_xmit(skb); | |
1526 | ||
1527 | return 0; | |
1528 | ||
1529 | fail: | |
1530 | if (!ret) | |
1531 | dev_kfree_skb(skb); | |
1532 | ||
1533 | return ret; | |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * This is the transmit routine for the 802.11 type interfaces | |
1538 | * called by upper layers of the linux networking | |
1539 | * stack when it has a frame to transmit | |
1540 | */ | |
1541 | int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1542 | { | |
1543 | struct ieee80211_sub_if_data *sdata; | |
1544 | struct ieee80211_tx_packet_data *pkt_data; | |
1545 | struct ieee80211_hdr *hdr; | |
1546 | u16 fc; | |
1547 | ||
1548 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1549 | ||
1550 | if (skb->len < 10) { | |
1551 | dev_kfree_skb(skb); | |
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | if (skb_headroom(skb) < sdata->local->tx_headroom) { | |
1556 | if (pskb_expand_head(skb, sdata->local->tx_headroom, | |
1557 | 0, GFP_ATOMIC)) { | |
1558 | dev_kfree_skb(skb); | |
1559 | return 0; | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | hdr = (struct ieee80211_hdr *) skb->data; | |
1564 | fc = le16_to_cpu(hdr->frame_control); | |
1565 | ||
1566 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
1567 | memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); | |
1568 | pkt_data->ifindex = sdata->dev->ifindex; | |
e8bf9649 JS |
1569 | if (sdata->type == IEEE80211_IF_TYPE_MGMT) |
1570 | pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE; | |
e2ebc74d JB |
1571 | |
1572 | skb->priority = 20; /* use hardcoded priority for mgmt TX queue */ | |
1573 | skb->dev = sdata->local->mdev; | |
1574 | ||
1575 | /* | |
1576 | * We're using the protocol field of the the frame control header | |
1577 | * to request TX callback for hostapd. BIT(1) is checked. | |
1578 | */ | |
1579 | if ((fc & BIT(1)) == BIT(1)) { | |
e8bf9649 | 1580 | pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS; |
e2ebc74d JB |
1581 | fc &= ~BIT(1); |
1582 | hdr->frame_control = cpu_to_le16(fc); | |
1583 | } | |
1584 | ||
e8bf9649 JS |
1585 | if (!(fc & IEEE80211_FCTL_PROTECTED)) |
1586 | pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT; | |
e2ebc74d JB |
1587 | |
1588 | sdata->stats.tx_packets++; | |
1589 | sdata->stats.tx_bytes += skb->len; | |
1590 | ||
1591 | dev_queue_xmit(skb); | |
1592 | ||
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | /* helper functions for pending packets for when queues are stopped */ | |
1597 | ||
1598 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) | |
1599 | { | |
1600 | int i, j; | |
1601 | struct ieee80211_tx_stored_packet *store; | |
1602 | ||
1603 | for (i = 0; i < local->hw.queues; i++) { | |
1604 | if (!__ieee80211_queue_pending(local, i)) | |
1605 | continue; | |
1606 | store = &local->pending_packet[i]; | |
1607 | kfree_skb(store->skb); | |
1608 | for (j = 0; j < store->num_extra_frag; j++) | |
1609 | kfree_skb(store->extra_frag[j]); | |
1610 | kfree(store->extra_frag); | |
1611 | clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]); | |
1612 | } | |
1613 | } | |
1614 | ||
1615 | void ieee80211_tx_pending(unsigned long data) | |
1616 | { | |
1617 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1618 | struct net_device *dev = local->mdev; | |
1619 | struct ieee80211_tx_stored_packet *store; | |
1620 | struct ieee80211_txrx_data tx; | |
1621 | int i, ret, reschedule = 0; | |
1622 | ||
1623 | netif_tx_lock_bh(dev); | |
1624 | for (i = 0; i < local->hw.queues; i++) { | |
1625 | if (__ieee80211_queue_stopped(local, i)) | |
1626 | continue; | |
1627 | if (!__ieee80211_queue_pending(local, i)) { | |
1628 | reschedule = 1; | |
1629 | continue; | |
1630 | } | |
1631 | store = &local->pending_packet[i]; | |
1632 | tx.u.tx.control = &store->control; | |
1633 | tx.u.tx.extra_frag = store->extra_frag; | |
1634 | tx.u.tx.num_extra_frag = store->num_extra_frag; | |
1635 | tx.u.tx.last_frag_hwrate = store->last_frag_hwrate; | |
1636 | tx.u.tx.last_frag_rate = store->last_frag_rate; | |
badffb72 JS |
1637 | tx.flags = 0; |
1638 | if (store->last_frag_rate_ctrl_probe) | |
1639 | tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; | |
e2ebc74d JB |
1640 | ret = __ieee80211_tx(local, store->skb, &tx); |
1641 | if (ret) { | |
1642 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1643 | store->skb = NULL; | |
1644 | } else { | |
1645 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1646 | &local->state[i]); | |
1647 | reschedule = 1; | |
1648 | } | |
1649 | } | |
1650 | netif_tx_unlock_bh(dev); | |
1651 | if (reschedule) { | |
1652 | if (!ieee80211_qdisc_installed(dev)) { | |
1653 | if (!__ieee80211_queue_stopped(local, 0)) | |
1654 | netif_wake_queue(dev); | |
1655 | } else | |
1656 | netif_schedule(dev); | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | /* functions for drivers to get certain frames */ | |
1661 | ||
1662 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1663 | struct ieee80211_if_ap *bss, | |
1664 | struct sk_buff *skb) | |
1665 | { | |
1666 | u8 *pos, *tim; | |
1667 | int aid0 = 0; | |
1668 | int i, have_bits = 0, n1, n2; | |
1669 | ||
1670 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1671 | * mode. */ | |
be8755e1 | 1672 | read_lock_bh(&local->sta_lock); |
e2ebc74d JB |
1673 | if (atomic_read(&bss->num_sta_ps) > 0) |
1674 | /* in the hope that this is faster than | |
1675 | * checking byte-for-byte */ | |
1676 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1677 | IEEE80211_MAX_AID+1); | |
1678 | ||
1679 | if (bss->dtim_count == 0) | |
1680 | bss->dtim_count = bss->dtim_period - 1; | |
1681 | else | |
1682 | bss->dtim_count--; | |
1683 | ||
1684 | tim = pos = (u8 *) skb_put(skb, 6); | |
1685 | *pos++ = WLAN_EID_TIM; | |
1686 | *pos++ = 4; | |
1687 | *pos++ = bss->dtim_count; | |
1688 | *pos++ = bss->dtim_period; | |
1689 | ||
1690 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1691 | aid0 = 1; | |
1692 | ||
1693 | if (have_bits) { | |
1694 | /* Find largest even number N1 so that bits numbered 1 through | |
1695 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1696 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1697 | n1 = 0; | |
1698 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1699 | if (bss->tim[i]) { | |
1700 | n1 = i & 0xfe; | |
1701 | break; | |
1702 | } | |
1703 | } | |
1704 | n2 = n1; | |
1705 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1706 | if (bss->tim[i]) { | |
1707 | n2 = i; | |
1708 | break; | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | /* Bitmap control */ | |
1713 | *pos++ = n1 | aid0; | |
1714 | /* Part Virt Bitmap */ | |
1715 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1716 | ||
1717 | tim[1] = n2 - n1 + 4; | |
1718 | skb_put(skb, n2 - n1); | |
1719 | } else { | |
1720 | *pos++ = aid0; /* Bitmap control */ | |
1721 | *pos++ = 0; /* Part Virt Bitmap */ | |
1722 | } | |
be8755e1 | 1723 | read_unlock_bh(&local->sta_lock); |
e2ebc74d JB |
1724 | } |
1725 | ||
1726 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id, | |
1727 | struct ieee80211_tx_control *control) | |
1728 | { | |
1729 | struct ieee80211_local *local = hw_to_local(hw); | |
1730 | struct sk_buff *skb; | |
1731 | struct net_device *bdev; | |
1732 | struct ieee80211_sub_if_data *sdata = NULL; | |
1733 | struct ieee80211_if_ap *ap = NULL; | |
1734 | struct ieee80211_rate *rate; | |
1735 | struct rate_control_extra extra; | |
1736 | u8 *b_head, *b_tail; | |
1737 | int bh_len, bt_len; | |
1738 | ||
881d966b | 1739 | bdev = dev_get_by_index(&init_net, if_id); |
e2ebc74d JB |
1740 | if (bdev) { |
1741 | sdata = IEEE80211_DEV_TO_SUB_IF(bdev); | |
1742 | ap = &sdata->u.ap; | |
1743 | dev_put(bdev); | |
1744 | } | |
1745 | ||
1746 | if (!ap || sdata->type != IEEE80211_IF_TYPE_AP || | |
1747 | !ap->beacon_head) { | |
1748 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1749 | if (net_ratelimit()) | |
1750 | printk(KERN_DEBUG "no beacon data avail for idx=%d " | |
1751 | "(%s)\n", if_id, bdev ? bdev->name : "N/A"); | |
1752 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
1753 | return NULL; | |
1754 | } | |
1755 | ||
1756 | /* Assume we are generating the normal beacon locally */ | |
1757 | b_head = ap->beacon_head; | |
1758 | b_tail = ap->beacon_tail; | |
1759 | bh_len = ap->beacon_head_len; | |
1760 | bt_len = ap->beacon_tail_len; | |
1761 | ||
1762 | skb = dev_alloc_skb(local->tx_headroom + | |
1763 | bh_len + bt_len + 256 /* maximum TIM len */); | |
1764 | if (!skb) | |
1765 | return NULL; | |
1766 | ||
1767 | skb_reserve(skb, local->tx_headroom); | |
1768 | memcpy(skb_put(skb, bh_len), b_head, bh_len); | |
1769 | ||
1770 | ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data); | |
1771 | ||
1772 | ieee80211_beacon_add_tim(local, ap, skb); | |
1773 | ||
1774 | if (b_tail) { | |
1775 | memcpy(skb_put(skb, bt_len), b_tail, bt_len); | |
1776 | } | |
1777 | ||
1778 | if (control) { | |
1779 | memset(&extra, 0, sizeof(extra)); | |
1780 | extra.mode = local->oper_hw_mode; | |
1781 | ||
1782 | rate = rate_control_get_rate(local, local->mdev, skb, &extra); | |
1783 | if (!rate) { | |
1784 | if (net_ratelimit()) { | |
1785 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate " | |
1786 | "found\n", local->mdev->name); | |
1787 | } | |
1788 | dev_kfree_skb(skb); | |
1789 | return NULL; | |
1790 | } | |
1791 | ||
13262ffd JS |
1792 | control->tx_rate = |
1793 | ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) && | |
1794 | (rate->flags & IEEE80211_RATE_PREAMBLE2)) ? | |
e2ebc74d JB |
1795 | rate->val2 : rate->val; |
1796 | control->antenna_sel_tx = local->hw.conf.antenna_sel_tx; | |
1797 | control->power_level = local->hw.conf.power_level; | |
1798 | control->flags |= IEEE80211_TXCTL_NO_ACK; | |
1799 | control->retry_limit = 1; | |
1800 | control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK; | |
1801 | } | |
1802 | ||
1803 | ap->num_beacons++; | |
1804 | return skb; | |
1805 | } | |
1806 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1807 | ||
7e9ed188 | 1808 | void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id, |
e2ebc74d JB |
1809 | const void *frame, size_t frame_len, |
1810 | const struct ieee80211_tx_control *frame_txctl, | |
1811 | struct ieee80211_rts *rts) | |
1812 | { | |
1813 | const struct ieee80211_hdr *hdr = frame; | |
1814 | u16 fctl; | |
1815 | ||
1816 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS; | |
1817 | rts->frame_control = cpu_to_le16(fctl); | |
7e9ed188 | 1818 | rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl); |
e2ebc74d JB |
1819 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1820 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1821 | } | |
1822 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1823 | ||
7e9ed188 | 1824 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id, |
e2ebc74d JB |
1825 | const void *frame, size_t frame_len, |
1826 | const struct ieee80211_tx_control *frame_txctl, | |
1827 | struct ieee80211_cts *cts) | |
1828 | { | |
1829 | const struct ieee80211_hdr *hdr = frame; | |
1830 | u16 fctl; | |
1831 | ||
1832 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS; | |
1833 | cts->frame_control = cpu_to_le16(fctl); | |
7e9ed188 | 1834 | cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl); |
e2ebc74d JB |
1835 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1836 | } | |
1837 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1838 | ||
1839 | struct sk_buff * | |
1840 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id, | |
1841 | struct ieee80211_tx_control *control) | |
1842 | { | |
1843 | struct ieee80211_local *local = hw_to_local(hw); | |
1844 | struct sk_buff *skb; | |
1845 | struct sta_info *sta; | |
1846 | ieee80211_tx_handler *handler; | |
1847 | struct ieee80211_txrx_data tx; | |
1848 | ieee80211_txrx_result res = TXRX_DROP; | |
1849 | struct net_device *bdev; | |
1850 | struct ieee80211_sub_if_data *sdata; | |
1851 | struct ieee80211_if_ap *bss = NULL; | |
1852 | ||
881d966b | 1853 | bdev = dev_get_by_index(&init_net, if_id); |
e2ebc74d JB |
1854 | if (bdev) { |
1855 | sdata = IEEE80211_DEV_TO_SUB_IF(bdev); | |
1856 | bss = &sdata->u.ap; | |
1857 | dev_put(bdev); | |
1858 | } | |
1859 | if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head) | |
1860 | return NULL; | |
1861 | ||
1862 | if (bss->dtim_count != 0) | |
1863 | return NULL; /* send buffered bc/mc only after DTIM beacon */ | |
1864 | memset(control, 0, sizeof(*control)); | |
1865 | while (1) { | |
1866 | skb = skb_dequeue(&bss->ps_bc_buf); | |
1867 | if (!skb) | |
1868 | return NULL; | |
1869 | local->total_ps_buffered--; | |
1870 | ||
1871 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
1872 | struct ieee80211_hdr *hdr = | |
1873 | (struct ieee80211_hdr *) skb->data; | |
1874 | /* more buffered multicast/broadcast frames ==> set | |
1875 | * MoreData flag in IEEE 802.11 header to inform PS | |
1876 | * STAs */ | |
1877 | hdr->frame_control |= | |
1878 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
1879 | } | |
1880 | ||
1881 | if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0) | |
1882 | break; | |
1883 | dev_kfree_skb_any(skb); | |
1884 | } | |
1885 | sta = tx.sta; | |
badffb72 | 1886 | tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED; |
e2ebc74d JB |
1887 | |
1888 | for (handler = local->tx_handlers; *handler != NULL; handler++) { | |
1889 | res = (*handler)(&tx); | |
1890 | if (res == TXRX_DROP || res == TXRX_QUEUED) | |
1891 | break; | |
1892 | } | |
1893 | dev_put(tx.dev); | |
1894 | skb = tx.skb; /* handlers are allowed to change skb */ | |
1895 | ||
1896 | if (res == TXRX_DROP) { | |
1897 | I802_DEBUG_INC(local->tx_handlers_drop); | |
1898 | dev_kfree_skb(skb); | |
1899 | skb = NULL; | |
1900 | } else if (res == TXRX_QUEUED) { | |
1901 | I802_DEBUG_INC(local->tx_handlers_queued); | |
1902 | skb = NULL; | |
1903 | } | |
1904 | ||
1905 | if (sta) | |
1906 | sta_info_put(sta); | |
1907 | ||
1908 | return skb; | |
1909 | } | |
1910 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |