diff options
author | Johannes Berg <johannes@sipsolutions.net> | 2007-07-27 09:43:22 -0400 |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 19:47:33 -0400 |
commit | e2ebc74d7e3d71600640db6fbb28cc2f362184c1 (patch) | |
tree | 7f9a830869b9f6157ee8235feb4953df7a639dbd /net/mac80211/tx.c | |
parent | 340e11f332c695c43f506e82b1d39d00716c5005 (diff) |
[MAC80211]: split TX path into own file
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/tx.c')
-rw-r--r-- | net/mac80211/tx.c | 1869 |
1 files changed, 1869 insertions, 0 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c new file mode 100644 index 000000000000..dc128b412eab --- /dev/null +++ b/net/mac80211/tx.c | |||
@@ -0,0 +1,1869 @@ | |||
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); | ||