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