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