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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> | |
d4e46a3d | 20 | #include <linux/rcupdate.h> |
881d966b | 21 | #include <net/net_namespace.h> |
e2ebc74d JB |
22 | #include <net/ieee80211_radiotap.h> |
23 | #include <net/cfg80211.h> | |
24 | #include <net/mac80211.h> | |
25 | #include <asm/unaligned.h> | |
26 | ||
27 | #include "ieee80211_i.h" | |
28 | #include "ieee80211_led.h" | |
33b64eb2 | 29 | #include "mesh.h" |
e2ebc74d JB |
30 | #include "wep.h" |
31 | #include "wpa.h" | |
32 | #include "wme.h" | |
33 | #include "ieee80211_rate.h" | |
34 | ||
35 | #define IEEE80211_TX_OK 0 | |
36 | #define IEEE80211_TX_AGAIN 1 | |
37 | #define IEEE80211_TX_FRAG_AGAIN 2 | |
38 | ||
39 | /* misc utils */ | |
40 | ||
41 | static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata, | |
42 | struct ieee80211_hdr *hdr) | |
43 | { | |
44 | /* Set the sequence number for this frame. */ | |
45 | hdr->seq_ctrl = cpu_to_le16(sdata->sequence); | |
46 | ||
47 | /* Increase the sequence number. */ | |
48 | sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ; | |
49 | } | |
50 | ||
51 | #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP | |
52 | static void ieee80211_dump_frame(const char *ifname, const char *title, | |
53 | const struct sk_buff *skb) | |
54 | { | |
55 | const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
56 | u16 fc; | |
57 | int hdrlen; | |
0795af57 | 58 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
59 | |
60 | printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len); | |
61 | if (skb->len < 4) { | |
62 | printk("\n"); | |
63 | return; | |
64 | } | |
65 | ||
66 | fc = le16_to_cpu(hdr->frame_control); | |
67 | hdrlen = ieee80211_get_hdrlen(fc); | |
68 | if (hdrlen > skb->len) | |
69 | hdrlen = skb->len; | |
70 | if (hdrlen >= 4) | |
71 | printk(" FC=0x%04x DUR=0x%04x", | |
72 | fc, le16_to_cpu(hdr->duration_id)); | |
73 | if (hdrlen >= 10) | |
0795af57 | 74 | printk(" A1=%s", print_mac(mac, hdr->addr1)); |
e2ebc74d | 75 | if (hdrlen >= 16) |
0795af57 | 76 | printk(" A2=%s", print_mac(mac, hdr->addr2)); |
e2ebc74d | 77 | if (hdrlen >= 24) |
0795af57 | 78 | printk(" A3=%s", print_mac(mac, hdr->addr3)); |
e2ebc74d | 79 | if (hdrlen >= 30) |
0795af57 | 80 | printk(" A4=%s", print_mac(mac, hdr->addr4)); |
e2ebc74d JB |
81 | printk("\n"); |
82 | } | |
83 | #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
84 | static inline void ieee80211_dump_frame(const char *ifname, const char *title, | |
85 | struct sk_buff *skb) | |
86 | { | |
87 | } | |
88 | #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
89 | ||
5cf121c3 | 90 | static u16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
e2ebc74d JB |
91 | int next_frag_len) |
92 | { | |
93 | int rate, mrate, erp, dur, i; | |
5cf121c3 | 94 | struct ieee80211_rate *txrate = tx->rate; |
e2ebc74d | 95 | struct ieee80211_local *local = tx->local; |
8318d78a | 96 | struct ieee80211_supported_band *sband; |
e2ebc74d | 97 | |
8318d78a JB |
98 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
99 | ||
100 | erp = 0; | |
101 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
102 | erp = txrate->flags & IEEE80211_RATE_ERP_G; | |
e2ebc74d JB |
103 | |
104 | /* | |
105 | * data and mgmt (except PS Poll): | |
106 | * - during CFP: 32768 | |
107 | * - during contention period: | |
108 | * if addr1 is group address: 0 | |
109 | * if more fragments = 0 and addr1 is individual address: time to | |
110 | * transmit one ACK plus SIFS | |
111 | * if more fragments = 1 and addr1 is individual address: time to | |
112 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
113 | * | |
114 | * IEEE 802.11, 9.6: | |
115 | * - control response frame (CTS or ACK) shall be transmitted using the | |
116 | * same rate as the immediately previous frame in the frame exchange | |
117 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
118 | * at the highest possible rate belonging to the PHY rates in the | |
119 | * BSSBasicRateSet | |
120 | */ | |
121 | ||
122 | if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) { | |
123 | /* TODO: These control frames are not currently sent by | |
124 | * 80211.o, but should they be implemented, this function | |
125 | * needs to be updated to support duration field calculation. | |
126 | * | |
127 | * RTS: time needed to transmit pending data/mgmt frame plus | |
128 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
129 | * CTS: duration of immediately previous RTS minus time | |
130 | * required to transmit CTS and its SIFS | |
131 | * ACK: 0 if immediately previous directed data/mgmt had | |
132 | * more=0, with more=1 duration in ACK frame is duration | |
133 | * from previous frame minus time needed to transmit ACK | |
134 | * and its SIFS | |
135 | * PS Poll: BIT(15) | BIT(14) | aid | |
136 | */ | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* data/mgmt */ | |
141 | if (0 /* FIX: data/mgmt during CFP */) | |
142 | return 32768; | |
143 | ||
144 | if (group_addr) /* Group address as the destination - no ACK */ | |
145 | return 0; | |
146 | ||
147 | /* Individual destination address: | |
148 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
149 | * CTS and ACK frames shall be transmitted using the highest rate in | |
150 | * basic rate set that is less than or equal to the rate of the | |
151 | * immediately previous frame and that is using the same modulation | |
152 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
153 | * the highest mandatory rate of the PHY that is less than or equal to | |
154 | * the rate of the previous frame is used. | |
155 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
156 | */ | |
157 | rate = -1; | |
8318d78a JB |
158 | /* use lowest available if everything fails */ |
159 | mrate = sband->bitrates[0].bitrate; | |
160 | for (i = 0; i < sband->n_bitrates; i++) { | |
161 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 162 | |
8318d78a JB |
163 | if (r->bitrate > txrate->bitrate) |
164 | break; | |
e2ebc74d | 165 | |
8318d78a JB |
166 | if (tx->sdata->basic_rates & BIT(i)) |
167 | rate = r->bitrate; | |
168 | ||
169 | switch (sband->band) { | |
170 | case IEEE80211_BAND_2GHZ: { | |
171 | u32 flag; | |
172 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
173 | flag = IEEE80211_RATE_MANDATORY_G; | |
174 | else | |
175 | flag = IEEE80211_RATE_MANDATORY_B; | |
176 | if (r->flags & flag) | |
177 | mrate = r->bitrate; | |
178 | break; | |
179 | } | |
180 | case IEEE80211_BAND_5GHZ: | |
181 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
182 | mrate = r->bitrate; | |
183 | break; | |
184 | case IEEE80211_NUM_BANDS: | |
185 | WARN_ON(1); | |
186 | break; | |
187 | } | |
e2ebc74d JB |
188 | } |
189 | if (rate == -1) { | |
190 | /* No matching basic rate found; use highest suitable mandatory | |
191 | * PHY rate */ | |
192 | rate = mrate; | |
193 | } | |
194 | ||
195 | /* Time needed to transmit ACK | |
196 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
197 | * to closest integer */ | |
198 | ||
199 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
471b3efd | 200 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
201 | |
202 | if (next_frag_len) { | |
203 | /* Frame is fragmented: duration increases with time needed to | |
204 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
205 | dur *= 2; /* ACK + SIFS */ | |
206 | /* next fragment */ | |
207 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 208 | txrate->bitrate, erp, |
471b3efd | 209 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
210 | } |
211 | ||
212 | return dur; | |
213 | } | |
214 | ||
215 | static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local, | |
216 | int queue) | |
217 | { | |
218 | return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]); | |
219 | } | |
220 | ||
221 | static inline int __ieee80211_queue_pending(const struct ieee80211_local *local, | |
222 | int queue) | |
223 | { | |
224 | return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]); | |
225 | } | |
226 | ||
227 | static int inline is_ieee80211_device(struct net_device *dev, | |
228 | struct net_device *master) | |
229 | { | |
230 | return (wdev_priv(dev->ieee80211_ptr) == | |
231 | wdev_priv(master->ieee80211_ptr)); | |
232 | } | |
233 | ||
234 | /* tx handlers */ | |
235 | ||
9ae54c84 | 236 | static ieee80211_tx_result |
5cf121c3 | 237 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
238 | { |
239 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
240 | struct sk_buff *skb = tx->skb; | |
241 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
242 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
243 | u32 sta_flags; | |
244 | ||
5cf121c3 | 245 | if (unlikely(tx->flags & IEEE80211_TX_INJECTED)) |
9ae54c84 | 246 | return TX_CONTINUE; |
58d4185e | 247 | |
ece8eddd | 248 | if (unlikely(tx->local->sta_sw_scanning) && |
e2ebc74d JB |
249 | ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || |
250 | (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ)) | |
9ae54c84 | 251 | return TX_DROP; |
e2ebc74d | 252 | |
33b64eb2 LCC |
253 | if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) |
254 | return TX_CONTINUE; | |
255 | ||
5cf121c3 | 256 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 257 | return TX_CONTINUE; |
e2ebc74d JB |
258 | |
259 | sta_flags = tx->sta ? tx->sta->flags : 0; | |
260 | ||
5cf121c3 | 261 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 262 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
51fb61e7 | 263 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
e2ebc74d JB |
264 | (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) { |
265 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0795af57 | 266 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 267 | printk(KERN_DEBUG "%s: dropped data frame to not " |
0795af57 JP |
268 | "associated station %s\n", |
269 | tx->dev->name, print_mac(mac, hdr->addr1)); | |
e2ebc74d JB |
270 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
271 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 272 | return TX_DROP; |
e2ebc74d JB |
273 | } |
274 | } else { | |
275 | if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
276 | tx->local->num_sta == 0 && | |
51fb61e7 | 277 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) { |
e2ebc74d JB |
278 | /* |
279 | * No associated STAs - no need to send multicast | |
280 | * frames. | |
281 | */ | |
9ae54c84 | 282 | return TX_DROP; |
e2ebc74d | 283 | } |
9ae54c84 | 284 | return TX_CONTINUE; |
e2ebc74d JB |
285 | } |
286 | ||
9ae54c84 | 287 | return TX_CONTINUE; |
e2ebc74d JB |
288 | } |
289 | ||
9ae54c84 | 290 | static ieee80211_tx_result |
5cf121c3 | 291 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
292 | { |
293 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
294 | ||
295 | if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24) | |
296 | ieee80211_include_sequence(tx->sdata, hdr); | |
297 | ||
9ae54c84 | 298 | return TX_CONTINUE; |
e2ebc74d JB |
299 | } |
300 | ||
301 | /* This function is called whenever the AP is about to exceed the maximum limit | |
302 | * of buffered frames for power saving STAs. This situation should not really | |
303 | * happen often during normal operation, so dropping the oldest buffered packet | |
304 | * from each queue should be OK to make some room for new frames. */ | |
305 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
306 | { | |
307 | int total = 0, purged = 0; | |
308 | struct sk_buff *skb; | |
309 | struct ieee80211_sub_if_data *sdata; | |
310 | struct sta_info *sta; | |
311 | ||
79010420 JB |
312 | /* |
313 | * virtual interfaces are protected by RCU | |
314 | */ | |
315 | rcu_read_lock(); | |
316 | ||
317 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d JB |
318 | struct ieee80211_if_ap *ap; |
319 | if (sdata->dev == local->mdev || | |
51fb61e7 | 320 | sdata->vif.type != IEEE80211_IF_TYPE_AP) |
e2ebc74d JB |
321 | continue; |
322 | ap = &sdata->u.ap; | |
323 | skb = skb_dequeue(&ap->ps_bc_buf); | |
324 | if (skb) { | |
325 | purged++; | |
326 | dev_kfree_skb(skb); | |
327 | } | |
328 | total += skb_queue_len(&ap->ps_bc_buf); | |
329 | } | |
79010420 | 330 | rcu_read_unlock(); |
e2ebc74d | 331 | |
be8755e1 | 332 | read_lock_bh(&local->sta_lock); |
e2ebc74d JB |
333 | list_for_each_entry(sta, &local->sta_list, list) { |
334 | skb = skb_dequeue(&sta->ps_tx_buf); | |
335 | if (skb) { | |
336 | purged++; | |
337 | dev_kfree_skb(skb); | |
338 | } | |
339 | total += skb_queue_len(&sta->ps_tx_buf); | |
340 | } | |
be8755e1 | 341 | read_unlock_bh(&local->sta_lock); |
e2ebc74d JB |
342 | |
343 | local->total_ps_buffered = total; | |
344 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", | |
dd1cd4c6 | 345 | wiphy_name(local->hw.wiphy), purged); |
e2ebc74d JB |
346 | } |
347 | ||
9ae54c84 | 348 | static ieee80211_tx_result |
5cf121c3 | 349 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 350 | { |
7d54d0dd JB |
351 | /* |
352 | * broadcast/multicast frame | |
353 | * | |
354 | * If any of the associated stations is in power save mode, | |
355 | * the frame is buffered to be sent after DTIM beacon frame. | |
356 | * This is done either by the hardware or us. | |
357 | */ | |
358 | ||
359 | /* not AP/IBSS or ordered frame */ | |
360 | if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER)) | |
9ae54c84 | 361 | return TX_CONTINUE; |
7d54d0dd JB |
362 | |
363 | /* no stations in PS mode */ | |
364 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 365 | return TX_CONTINUE; |
7d54d0dd JB |
366 | |
367 | /* buffered in mac80211 */ | |
368 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
369 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
370 | purge_old_ps_buffers(tx->local); | |
371 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
372 | AP_MAX_BC_BUFFER) { | |
373 | if (net_ratelimit()) { | |
374 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
375 | "dropping the oldest frame\n", | |
376 | tx->dev->name); | |
377 | } | |
378 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); | |
379 | } else | |
380 | tx->local->total_ps_buffered++; | |
381 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 382 | return TX_QUEUED; |
e2ebc74d JB |
383 | } |
384 | ||
7d54d0dd | 385 | /* buffered in hardware */ |
5cf121c3 | 386 | tx->control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM; |
7d54d0dd | 387 | |
9ae54c84 | 388 | return TX_CONTINUE; |
e2ebc74d JB |
389 | } |
390 | ||
9ae54c84 | 391 | static ieee80211_tx_result |
5cf121c3 | 392 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
393 | { |
394 | struct sta_info *sta = tx->sta; | |
0795af57 | 395 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
396 | |
397 | if (unlikely(!sta || | |
398 | ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && | |
399 | (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) | |
9ae54c84 | 400 | return TX_CONTINUE; |
e2ebc74d | 401 | |
4a9a66e9 JB |
402 | if (unlikely((sta->flags & WLAN_STA_PS) && |
403 | !(sta->flags & WLAN_STA_PSPOLL))) { | |
e2ebc74d JB |
404 | struct ieee80211_tx_packet_data *pkt_data; |
405 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 406 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 407 | "before %d)\n", |
0795af57 | 408 | print_mac(mac, sta->addr), sta->aid, |
e2ebc74d JB |
409 | skb_queue_len(&sta->ps_tx_buf)); |
410 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
411 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
412 | purge_old_ps_buffers(tx->local); | |
413 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
414 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
415 | if (net_ratelimit()) { | |
0795af57 | 416 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 417 | "buffer full - dropping oldest frame\n", |
0795af57 | 418 | tx->dev->name, print_mac(mac, sta->addr)); |
e2ebc74d JB |
419 | } |
420 | dev_kfree_skb(old); | |
421 | } else | |
422 | tx->local->total_ps_buffered++; | |
004c872e | 423 | |
e2ebc74d | 424 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
425 | if (skb_queue_empty(&sta->ps_tx_buf)) |
426 | sta_info_set_tim_bit(sta); | |
427 | ||
e2ebc74d JB |
428 | pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb; |
429 | pkt_data->jiffies = jiffies; | |
430 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); | |
9ae54c84 | 431 | return TX_QUEUED; |
e2ebc74d JB |
432 | } |
433 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
434 | else if (unlikely(sta->flags & WLAN_STA_PS)) { | |
0795af57 | 435 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 436 | "set -> send frame\n", tx->dev->name, |
0795af57 | 437 | print_mac(mac, sta->addr)); |
e2ebc74d JB |
438 | } |
439 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
4a9a66e9 | 440 | sta->flags &= ~WLAN_STA_PSPOLL; |
e2ebc74d | 441 | |
9ae54c84 | 442 | return TX_CONTINUE; |
e2ebc74d JB |
443 | } |
444 | ||
9ae54c84 | 445 | static ieee80211_tx_result |
5cf121c3 | 446 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 447 | { |
5cf121c3 | 448 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 449 | return TX_CONTINUE; |
e2ebc74d | 450 | |
5cf121c3 | 451 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
452 | return ieee80211_tx_h_unicast_ps_buf(tx); |
453 | else | |
454 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
455 | } | |
456 | ||
9ae54c84 | 457 | static ieee80211_tx_result |
5cf121c3 | 458 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 459 | { |
d4e46a3d | 460 | struct ieee80211_key *key; |
176e4f84 | 461 | u16 fc = tx->fc; |
d4e46a3d | 462 | |
5cf121c3 | 463 | if (unlikely(tx->control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)) |
e2ebc74d | 464 | tx->key = NULL; |
d4e46a3d JB |
465 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
466 | tx->key = key; | |
467 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
468 | tx->key = key; | |
e2ebc74d | 469 | else if (tx->sdata->drop_unencrypted && |
5cf121c3 JB |
470 | !(tx->control->flags & IEEE80211_TXCTL_EAPOL_FRAME) && |
471 | !(tx->flags & IEEE80211_TX_INJECTED)) { | |
e2ebc74d | 472 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 473 | return TX_DROP; |
176e4f84 | 474 | } else |
e2ebc74d JB |
475 | tx->key = NULL; |
476 | ||
477 | if (tx->key) { | |
176e4f84 JB |
478 | u16 ftype, stype; |
479 | ||
e2ebc74d | 480 | tx->key->tx_rx_count++; |
011bfcc4 | 481 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
482 | |
483 | switch (tx->key->conf.alg) { | |
484 | case ALG_WEP: | |
485 | ftype = fc & IEEE80211_FCTL_FTYPE; | |
486 | stype = fc & IEEE80211_FCTL_STYPE; | |
487 | ||
488 | if (ftype == IEEE80211_FTYPE_MGMT && | |
489 | stype == IEEE80211_STYPE_AUTH) | |
490 | break; | |
491 | case ALG_TKIP: | |
492 | case ALG_CCMP: | |
493 | if (!WLAN_FC_DATA_PRESENT(fc)) | |
494 | tx->key = NULL; | |
495 | break; | |
496 | } | |
e2ebc74d JB |
497 | } |
498 | ||
176e4f84 | 499 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
5cf121c3 | 500 | tx->control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
176e4f84 | 501 | |
9ae54c84 | 502 | return TX_CONTINUE; |
e2ebc74d JB |
503 | } |
504 | ||
9ae54c84 | 505 | static ieee80211_tx_result |
5cf121c3 | 506 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
507 | { |
508 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
509 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; | |
510 | struct sk_buff **frags, *first, *frag; | |
511 | int i; | |
512 | u16 seq; | |
513 | u8 *pos; | |
514 | int frag_threshold = tx->local->fragmentation_threshold; | |
515 | ||
5cf121c3 | 516 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) |
9ae54c84 | 517 | return TX_CONTINUE; |
e2ebc74d JB |
518 | |
519 | first = tx->skb; | |
520 | ||
521 | hdrlen = ieee80211_get_hdrlen(tx->fc); | |
522 | payload_len = first->len - hdrlen; | |
523 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
172589cc | 524 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); |
e2ebc74d JB |
525 | |
526 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
527 | if (!frags) | |
528 | goto fail; | |
529 | ||
530 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
531 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
532 | pos = first->data + hdrlen + per_fragm; | |
533 | left = payload_len - per_fragm; | |
534 | for (i = 0; i < num_fragm - 1; i++) { | |
535 | struct ieee80211_hdr *fhdr; | |
536 | size_t copylen; | |
537 | ||
538 | if (left <= 0) | |
539 | goto fail; | |
540 | ||
541 | /* reserve enough extra head and tail room for possible | |
542 | * encryption */ | |
543 | frag = frags[i] = | |
544 | dev_alloc_skb(tx->local->tx_headroom + | |
545 | frag_threshold + | |
546 | IEEE80211_ENCRYPT_HEADROOM + | |
547 | IEEE80211_ENCRYPT_TAILROOM); | |
548 | if (!frag) | |
549 | goto fail; | |
550 | /* Make sure that all fragments use the same priority so | |
551 | * that they end up using the same TX queue */ | |
552 | frag->priority = first->priority; | |
553 | skb_reserve(frag, tx->local->tx_headroom + | |
554 | IEEE80211_ENCRYPT_HEADROOM); | |
555 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
556 | memcpy(fhdr, first->data, hdrlen); | |
557 | if (i == num_fragm - 2) | |
558 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
559 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
560 | copylen = left > per_fragm ? per_fragm : left; | |
561 | memcpy(skb_put(frag, copylen), pos, copylen); | |
562 | ||
563 | pos += copylen; | |
564 | left -= copylen; | |
565 | } | |
566 | skb_trim(first, hdrlen + per_fragm); | |
567 | ||
5cf121c3 JB |
568 | tx->num_extra_frag = num_fragm - 1; |
569 | tx->extra_frag = frags; | |
e2ebc74d | 570 | |
9ae54c84 | 571 | return TX_CONTINUE; |
e2ebc74d JB |
572 | |
573 | fail: | |
574 | printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); | |
575 | if (frags) { | |
576 | for (i = 0; i < num_fragm - 1; i++) | |
577 | if (frags[i]) | |
578 | dev_kfree_skb(frags[i]); | |
579 | kfree(frags); | |
580 | } | |
581 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
9ae54c84 | 582 | return TX_DROP; |
e2ebc74d JB |
583 | } |
584 | ||
9ae54c84 | 585 | static ieee80211_tx_result |
5cf121c3 | 586 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
e2ebc74d | 587 | { |
6a22a59d | 588 | if (!tx->key) |
9ae54c84 | 589 | return TX_CONTINUE; |
e2ebc74d | 590 | |
6a22a59d JB |
591 | switch (tx->key->conf.alg) { |
592 | case ALG_WEP: | |
593 | return ieee80211_crypto_wep_encrypt(tx); | |
594 | case ALG_TKIP: | |
595 | return ieee80211_crypto_tkip_encrypt(tx); | |
596 | case ALG_CCMP: | |
597 | return ieee80211_crypto_ccmp_encrypt(tx); | |
e2ebc74d JB |
598 | } |
599 | ||
6a22a59d JB |
600 | /* not reached */ |
601 | WARN_ON(1); | |
9ae54c84 | 602 | return TX_DROP; |
e2ebc74d JB |
603 | } |
604 | ||
9ae54c84 | 605 | static ieee80211_tx_result |
5cf121c3 | 606 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 607 | { |
1abbe498 | 608 | struct rate_selection rsel; |
8318d78a JB |
609 | struct ieee80211_supported_band *sband; |
610 | ||
611 | sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band]; | |
e2ebc74d | 612 | |
5cf121c3 | 613 | if (likely(!tx->rate)) { |
8318d78a | 614 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
5cf121c3 | 615 | tx->rate = rsel.rate; |
8318d78a | 616 | if (unlikely(rsel.probe)) { |
5cf121c3 | 617 | tx->control->flags |= |
58d4185e | 618 | IEEE80211_TXCTL_RATE_CTRL_PROBE; |
5cf121c3 JB |
619 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
620 | tx->control->alt_retry_rate = tx->rate; | |
621 | tx->rate = rsel.probe; | |
58d4185e | 622 | } else |
5cf121c3 | 623 | tx->control->alt_retry_rate = NULL; |
58d4185e | 624 | |
5cf121c3 | 625 | if (!tx->rate) |
9ae54c84 | 626 | return TX_DROP; |
58d4185e | 627 | } else |
5cf121c3 | 628 | tx->control->alt_retry_rate = NULL; |
58d4185e | 629 | |
8318d78a | 630 | if (tx->sdata->bss_conf.use_cts_prot && |
5cf121c3 JB |
631 | (tx->flags & IEEE80211_TX_FRAGMENTED) && rsel.nonerp) { |
632 | tx->last_frag_rate = tx->rate; | |
1abbe498 | 633 | if (rsel.probe) |
5cf121c3 | 634 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 635 | else |
5cf121c3 JB |
636 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
637 | tx->rate = rsel.nonerp; | |
638 | tx->control->tx_rate = rsel.nonerp; | |
639 | tx->control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
e2ebc74d | 640 | } else { |
5cf121c3 JB |
641 | tx->last_frag_rate = tx->rate; |
642 | tx->control->tx_rate = tx->rate; | |
e2ebc74d | 643 | } |
5cf121c3 | 644 | tx->control->tx_rate = tx->rate; |
e2ebc74d | 645 | |
9ae54c84 | 646 | return TX_CONTINUE; |
e2ebc74d JB |
647 | } |
648 | ||
9ae54c84 | 649 | static ieee80211_tx_result |
5cf121c3 | 650 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
651 | { |
652 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
7e9ed188 | 653 | u16 fc = le16_to_cpu(hdr->frame_control); |
e2ebc74d | 654 | u16 dur; |
5cf121c3 | 655 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d | 656 | |
58d4185e JB |
657 | if (!control->retry_limit) { |
658 | if (!is_multicast_ether_addr(hdr->addr1)) { | |
659 | if (tx->skb->len + FCS_LEN > tx->local->rts_threshold | |
660 | && tx->local->rts_threshold < | |
661 | IEEE80211_MAX_RTS_THRESHOLD) { | |
662 | control->flags |= | |
663 | IEEE80211_TXCTL_USE_RTS_CTS; | |
664 | control->flags |= | |
665 | IEEE80211_TXCTL_LONG_RETRY_LIMIT; | |
666 | control->retry_limit = | |
667 | tx->local->long_retry_limit; | |
668 | } else { | |
669 | control->retry_limit = | |
670 | tx->local->short_retry_limit; | |
671 | } | |
e2ebc74d | 672 | } else { |
58d4185e | 673 | control->retry_limit = 1; |
e2ebc74d | 674 | } |
e2ebc74d JB |
675 | } |
676 | ||
5cf121c3 | 677 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
678 | /* Do not use multiple retry rates when sending fragmented |
679 | * frames. | |
680 | * TODO: The last fragment could still use multiple retry | |
681 | * rates. */ | |
8318d78a | 682 | control->alt_retry_rate = NULL; |
e2ebc74d JB |
683 | } |
684 | ||
685 | /* Use CTS protection for unicast frames sent using extended rates if | |
686 | * there are associated non-ERP stations and RTS/CTS is not configured | |
687 | * for the frame. */ | |
8318d78a | 688 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
5cf121c3 JB |
689 | (tx->rate->flags & IEEE80211_RATE_ERP_G) && |
690 | (tx->flags & IEEE80211_TX_UNICAST) && | |
471b3efd | 691 | tx->sdata->bss_conf.use_cts_prot && |
e2ebc74d JB |
692 | !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS)) |
693 | control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT; | |
694 | ||
7e9ed188 DD |
695 | /* Transmit data frames using short preambles if the driver supports |
696 | * short preambles at the selected rate and short preambles are | |
697 | * available on the network at the current point in time. */ | |
698 | if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
5cf121c3 | 699 | (tx->rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 700 | tx->sdata->bss_conf.use_short_preamble && |
7e9ed188 | 701 | (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) { |
5cf121c3 | 702 | tx->control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE; |
7e9ed188 DD |
703 | } |
704 | ||
e2ebc74d JB |
705 | /* Setup duration field for the first fragment of the frame. Duration |
706 | * for remaining fragments will be updated when they are being sent | |
707 | * to low-level driver in ieee80211_tx(). */ | |
708 | dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1), | |
5cf121c3 JB |
709 | (tx->flags & IEEE80211_TX_FRAGMENTED) ? |
710 | tx->extra_frag[0]->len : 0); | |
e2ebc74d JB |
711 | hdr->duration_id = cpu_to_le16(dur); |
712 | ||
713 | if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) || | |
714 | (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) { | |
8318d78a JB |
715 | struct ieee80211_supported_band *sband; |
716 | struct ieee80211_rate *rate, *baserate; | |
717 | int idx; | |
718 | ||
719 | sband = tx->local->hw.wiphy->bands[ | |
720 | tx->local->hw.conf.channel->band]; | |
e2ebc74d JB |
721 | |
722 | /* Do not use multiple retry rates when using RTS/CTS */ | |
8318d78a | 723 | control->alt_retry_rate = NULL; |
e2ebc74d JB |
724 | |
725 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
5cf121c3 | 726 | rate = tx->rate; |
8318d78a JB |
727 | baserate = NULL; |
728 | ||
729 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
730 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
731 | continue; | |
732 | if (tx->sdata->basic_rates & BIT(idx) && | |
733 | (!baserate || | |
734 | (baserate->bitrate < sband->bitrates[idx].bitrate))) | |
735 | baserate = &sband->bitrates[idx]; | |
736 | } | |
e2ebc74d | 737 | |
8318d78a JB |
738 | if (baserate) |
739 | control->rts_cts_rate = baserate; | |
740 | else | |
741 | control->rts_cts_rate = &sband->bitrates[0]; | |
e2ebc74d JB |
742 | } |
743 | ||
744 | if (tx->sta) { | |
745 | tx->sta->tx_packets++; | |
746 | tx->sta->tx_fragments++; | |
747 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 748 | if (tx->extra_frag) { |
e2ebc74d | 749 | int i; |
5cf121c3 JB |
750 | tx->sta->tx_fragments += tx->num_extra_frag; |
751 | for (i = 0; i < tx->num_extra_frag; i++) { | |
e2ebc74d | 752 | tx->sta->tx_bytes += |
5cf121c3 | 753 | tx->extra_frag[i]->len; |
e2ebc74d JB |
754 | } |
755 | } | |
756 | } | |
757 | ||
9ae54c84 | 758 | return TX_CONTINUE; |
e2ebc74d JB |
759 | } |
760 | ||
9ae54c84 | 761 | static ieee80211_tx_result |
5cf121c3 | 762 | ieee80211_tx_h_load_stats(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
763 | { |
764 | struct ieee80211_local *local = tx->local; | |
e2ebc74d JB |
765 | struct sk_buff *skb = tx->skb; |
766 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
767 | u32 load = 0, hdrtime; | |
5cf121c3 | 768 | struct ieee80211_rate *rate = tx->rate; |
e2ebc74d JB |
769 | |
770 | /* TODO: this could be part of tx_status handling, so that the number | |
771 | * of retries would be known; TX rate should in that case be stored | |
772 | * somewhere with the packet */ | |
773 | ||
774 | /* Estimate total channel use caused by this frame */ | |
775 | ||
776 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
777 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
778 | ||
5cf121c3 JB |
779 | if (tx->channel->band == IEEE80211_BAND_5GHZ || |
780 | (tx->channel->band == IEEE80211_BAND_2GHZ && | |
8318d78a | 781 | rate->flags & IEEE80211_RATE_ERP_G)) |
e2ebc74d JB |
782 | hdrtime = CHAN_UTIL_HDR_SHORT; |
783 | else | |
784 | hdrtime = CHAN_UTIL_HDR_LONG; | |
785 | ||
786 | load = hdrtime; | |
787 | if (!is_multicast_ether_addr(hdr->addr1)) | |
788 | load += hdrtime; | |
789 | ||
5cf121c3 | 790 | if (tx->control->flags & IEEE80211_TXCTL_USE_RTS_CTS) |
e2ebc74d | 791 | load += 2 * hdrtime; |
5cf121c3 | 792 | else if (tx->control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) |
e2ebc74d JB |
793 | load += hdrtime; |
794 | ||
8318d78a JB |
795 | /* TODO: optimise again */ |
796 | load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate; | |
e2ebc74d | 797 | |
5cf121c3 | 798 | if (tx->extra_frag) { |
e2ebc74d | 799 | int i; |
5cf121c3 | 800 | for (i = 0; i < tx->num_extra_frag; i++) { |
e2ebc74d | 801 | load += 2 * hdrtime; |
5cf121c3 JB |
802 | load += tx->extra_frag[i]->len * |
803 | tx->rate->bitrate; | |
e2ebc74d JB |
804 | } |
805 | } | |
806 | ||
807 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
808 | load >>= CHAN_UTIL_SHIFT; | |
809 | local->channel_use_raw += load; | |
810 | if (tx->sta) | |
811 | tx->sta->channel_use_raw += load; | |
812 | tx->sdata->channel_use_raw += load; | |
813 | ||
9ae54c84 | 814 | return TX_CONTINUE; |
e2ebc74d JB |
815 | } |
816 | ||
e2ebc74d | 817 | |
5cf121c3 | 818 | typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *); |
58905290 | 819 | static ieee80211_tx_handler ieee80211_tx_handlers[] = |
e2ebc74d JB |
820 | { |
821 | ieee80211_tx_h_check_assoc, | |
822 | ieee80211_tx_h_sequence, | |
823 | ieee80211_tx_h_ps_buf, | |
824 | ieee80211_tx_h_select_key, | |
825 | ieee80211_tx_h_michael_mic_add, | |
826 | ieee80211_tx_h_fragment, | |
6a22a59d | 827 | ieee80211_tx_h_encrypt, |
e2ebc74d JB |
828 | ieee80211_tx_h_rate_ctrl, |
829 | ieee80211_tx_h_misc, | |
830 | ieee80211_tx_h_load_stats, | |
831 | NULL | |
832 | }; | |
833 | ||
834 | /* actual transmit path */ | |
835 | ||
836 | /* | |
837 | * deal with packet injection down monitor interface | |
838 | * with Radiotap Header -- only called for monitor mode interface | |
839 | */ | |
9ae54c84 | 840 | static ieee80211_tx_result |
5cf121c3 | 841 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 842 | struct sk_buff *skb) |
e2ebc74d JB |
843 | { |
844 | /* | |
845 | * this is the moment to interpret and discard the radiotap header that | |
846 | * must be at the start of the packet injected in Monitor mode | |
847 | * | |
848 | * Need to take some care with endian-ness since radiotap | |
849 | * args are little-endian | |
850 | */ | |
851 | ||
852 | struct ieee80211_radiotap_iterator iterator; | |
853 | struct ieee80211_radiotap_header *rthdr = | |
854 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 855 | struct ieee80211_supported_band *sband; |
e2ebc74d | 856 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
5cf121c3 | 857 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d | 858 | |
8318d78a JB |
859 | sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band]; |
860 | ||
58d4185e | 861 | control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
5cf121c3 JB |
862 | tx->flags |= IEEE80211_TX_INJECTED; |
863 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; | |
e2ebc74d JB |
864 | |
865 | /* | |
866 | * for every radiotap entry that is present | |
867 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
868 | * entries present, or -EINVAL on error) | |
869 | */ | |
870 | ||
871 | while (!ret) { | |
872 | int i, target_rate; | |
873 | ||
874 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
875 | ||
876 | if (ret) | |
877 | continue; | |
878 | ||
879 | /* see if this argument is something we can use */ | |
880 | switch (iterator.this_arg_index) { | |
881 | /* | |
882 | * You must take care when dereferencing iterator.this_arg | |
883 | * for multibyte types... the pointer is not aligned. Use | |
884 | * get_unaligned((type *)iterator.this_arg) to dereference | |
885 | * iterator.this_arg for type "type" safely on all arches. | |
886 | */ | |
887 | case IEEE80211_RADIOTAP_RATE: | |
888 | /* | |
889 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
890 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
891 | */ | |
892 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
893 | for (i = 0; i < sband->n_bitrates; i++) { |
894 | struct ieee80211_rate *r; | |
e2ebc74d | 895 | |
8318d78a JB |
896 | r = &sband->bitrates[i]; |
897 | ||
898 | if (r->bitrate == target_rate) { | |
5cf121c3 | 899 | tx->rate = r; |
58d4185e JB |
900 | break; |
901 | } | |
e2ebc74d JB |
902 | } |
903 | break; | |
904 | ||
905 | case IEEE80211_RADIOTAP_ANTENNA: | |
906 | /* | |
907 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
908 | * 1st ant | |
909 | */ | |
910 | control->antenna_sel_tx = (*iterator.this_arg) + 1; | |
911 | break; | |
912 | ||
8318d78a | 913 | #if 0 |
e2ebc74d JB |
914 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
915 | control->power_level = *iterator.this_arg; | |
916 | break; | |
8318d78a | 917 | #endif |
e2ebc74d JB |
918 | |
919 | case IEEE80211_RADIOTAP_FLAGS: | |
920 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
921 | /* | |
922 | * this indicates that the skb we have been | |
923 | * handed has the 32-bit FCS CRC at the end... | |
924 | * we should react to that by snipping it off | |
925 | * because it will be recomputed and added | |
926 | * on transmission | |
927 | */ | |
928 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 929 | return TX_DROP; |
e2ebc74d JB |
930 | |
931 | skb_trim(skb, skb->len - FCS_LEN); | |
932 | } | |
58d4185e JB |
933 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
934 | control->flags &= | |
935 | ~IEEE80211_TXCTL_DO_NOT_ENCRYPT; | |
936 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) | |
5cf121c3 | 937 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
938 | break; |
939 | ||
58d4185e JB |
940 | /* |
941 | * Please update the file | |
942 | * Documentation/networking/mac80211-injection.txt | |
943 | * when parsing new fields here. | |
944 | */ | |
945 | ||
e2ebc74d JB |
946 | default: |
947 | break; | |
948 | } | |
949 | } | |
950 | ||
951 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 952 | return TX_DROP; |
e2ebc74d JB |
953 | |
954 | /* | |
955 | * remove the radiotap header | |
956 | * iterator->max_length was sanity-checked against | |
957 | * skb->len by iterator init | |
958 | */ | |
959 | skb_pull(skb, iterator.max_length); | |
960 | ||
9ae54c84 | 961 | return TX_CONTINUE; |
e2ebc74d JB |
962 | } |
963 | ||
58d4185e JB |
964 | /* |
965 | * initialises @tx | |
966 | */ | |
9ae54c84 | 967 | static ieee80211_tx_result |
5cf121c3 | 968 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d JB |
969 | struct sk_buff *skb, |
970 | struct net_device *dev, | |
971 | struct ieee80211_tx_control *control) | |
972 | { | |
973 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 974 | struct ieee80211_hdr *hdr; |
e2ebc74d | 975 | struct ieee80211_sub_if_data *sdata; |
e2ebc74d JB |
976 | |
977 | int hdrlen; | |
978 | ||
979 | memset(tx, 0, sizeof(*tx)); | |
980 | tx->skb = skb; | |
981 | tx->dev = dev; /* use original interface */ | |
982 | tx->local = local; | |
983 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
5cf121c3 | 984 | tx->control = control; |
e2ebc74d | 985 | /* |
58d4185e JB |
986 | * Set this flag (used below to indicate "automatic fragmentation"), |
987 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 988 | */ |
5cf121c3 | 989 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
990 | |
991 | /* process and remove the injection radiotap header */ | |
992 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
51fb61e7 | 993 | if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { |
9ae54c84 JB |
994 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
995 | return TX_DROP; | |
58d4185e | 996 | |
e2ebc74d | 997 | /* |
58d4185e JB |
998 | * __ieee80211_parse_tx_radiotap has now removed |
999 | * the radiotap header that was present and pre-filled | |
1000 | * 'tx' with tx control information. | |
e2ebc74d | 1001 | */ |
e2ebc74d JB |
1002 | } |
1003 | ||
58d4185e JB |
1004 | hdr = (struct ieee80211_hdr *) skb->data; |
1005 | ||
24338793 | 1006 | tx->sta = sta_info_get(local, hdr->addr1); |
1007 | tx->fc = le16_to_cpu(hdr->frame_control); | |
58d4185e | 1008 | |
badffb72 | 1009 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1010 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e2ebc74d | 1011 | control->flags |= IEEE80211_TXCTL_NO_ACK; |
badffb72 | 1012 | } else { |
5cf121c3 | 1013 | tx->flags |= IEEE80211_TX_UNICAST; |
e2ebc74d | 1014 | control->flags &= ~IEEE80211_TXCTL_NO_ACK; |
badffb72 | 1015 | } |
58d4185e | 1016 | |
5cf121c3 JB |
1017 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1018 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e JB |
1019 | skb->len + FCS_LEN > local->fragmentation_threshold && |
1020 | !local->ops->set_frag_threshold) | |
5cf121c3 | 1021 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1022 | else |
5cf121c3 | 1023 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1024 | } |
1025 | ||
e2ebc74d | 1026 | if (!tx->sta) |
d46e144b JB |
1027 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; |
1028 | else if (tx->sta->flags & WLAN_STA_CLEAR_PS_FILT) { | |
1029 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; | |
1030 | tx->sta->flags &= ~WLAN_STA_CLEAR_PS_FILT; | |
e2ebc74d | 1031 | } |
58d4185e | 1032 | |
e2ebc74d JB |
1033 | hdrlen = ieee80211_get_hdrlen(tx->fc); |
1034 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { | |
1035 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1036 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1037 | } | |
1038 | control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT; | |
1039 | ||
9ae54c84 | 1040 | return TX_CONTINUE; |
e2ebc74d JB |
1041 | } |
1042 | ||
32bfd35d | 1043 | /* |
58d4185e JB |
1044 | * NB: @tx is uninitialised when passed in here |
1045 | */ | |
5cf121c3 | 1046 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e JB |
1047 | struct sk_buff *skb, |
1048 | struct net_device *mdev, | |
1049 | struct ieee80211_tx_control *control) | |
e2ebc74d JB |
1050 | { |
1051 | struct ieee80211_tx_packet_data *pkt_data; | |
1052 | struct net_device *dev; | |
1053 | ||
1054 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
881d966b | 1055 | dev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1056 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1057 | dev_put(dev); | |
1058 | dev = NULL; | |
1059 | } | |
1060 | if (unlikely(!dev)) | |
1061 | return -ENODEV; | |
58d4185e | 1062 | /* initialises tx with control */ |
e2ebc74d | 1063 | __ieee80211_tx_prepare(tx, skb, dev, control); |
32bfd35d | 1064 | dev_put(dev); |
e2ebc74d JB |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1069 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1070 | { |
5cf121c3 | 1071 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d JB |
1072 | int ret, i; |
1073 | ||
1074 | if (!ieee80211_qdisc_installed(local->mdev) && | |
1075 | __ieee80211_queue_stopped(local, 0)) { | |
1076 | netif_stop_queue(local->mdev); | |
1077 | return IEEE80211_TX_AGAIN; | |
1078 | } | |
1079 | if (skb) { | |
dd1cd4c6 JB |
1080 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
1081 | "TX to low-level driver", skb); | |
e2ebc74d JB |
1082 | ret = local->ops->tx(local_to_hw(local), skb, control); |
1083 | if (ret) | |
1084 | return IEEE80211_TX_AGAIN; | |
1085 | local->mdev->trans_start = jiffies; | |
1086 | ieee80211_led_tx(local, 1); | |
1087 | } | |
5cf121c3 | 1088 | if (tx->extra_frag) { |
e2ebc74d JB |
1089 | control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS | |
1090 | IEEE80211_TXCTL_USE_CTS_PROTECT | | |
d46e144b | 1091 | IEEE80211_TXCTL_CLEAR_PS_FILT | |
e2ebc74d | 1092 | IEEE80211_TXCTL_FIRST_FRAGMENT); |
5cf121c3 JB |
1093 | for (i = 0; i < tx->num_extra_frag; i++) { |
1094 | if (!tx->extra_frag[i]) | |
e2ebc74d JB |
1095 | continue; |
1096 | if (__ieee80211_queue_stopped(local, control->queue)) | |
1097 | return IEEE80211_TX_FRAG_AGAIN; | |
5cf121c3 JB |
1098 | if (i == tx->num_extra_frag) { |
1099 | control->tx_rate = tx->last_frag_rate; | |
8318d78a | 1100 | |
5cf121c3 | 1101 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e2ebc74d JB |
1102 | control->flags |= |
1103 | IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1104 | else | |
1105 | control->flags &= | |
1106 | ~IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1107 | } | |
1108 | ||
dd1cd4c6 | 1109 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
e2ebc74d | 1110 | "TX to low-level driver", |
5cf121c3 | 1111 | tx->extra_frag[i]); |
e2ebc74d | 1112 | ret = local->ops->tx(local_to_hw(local), |
5cf121c3 | 1113 | tx->extra_frag[i], |
e2ebc74d JB |
1114 | control); |
1115 | if (ret) | |
1116 | return IEEE80211_TX_FRAG_AGAIN; | |
1117 | local->mdev->trans_start = jiffies; | |
1118 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1119 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1120 | } |
5cf121c3 JB |
1121 | kfree(tx->extra_frag); |
1122 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1123 | } |
1124 | return IEEE80211_TX_OK; | |
1125 | } | |
1126 | ||
1127 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb, | |
f9d540ee | 1128 | struct ieee80211_tx_control *control) |
e2ebc74d JB |
1129 | { |
1130 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1131 | struct sta_info *sta; | |
1132 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1133 | struct ieee80211_tx_data tx; |
9ae54c84 | 1134 | ieee80211_tx_result res = TX_DROP, res_prepare; |
e2ebc74d JB |
1135 | int ret, i; |
1136 | ||
1137 | WARN_ON(__ieee80211_queue_pending(local, control->queue)); | |
1138 | ||
1139 | if (unlikely(skb->len < 10)) { | |
1140 | dev_kfree_skb(skb); | |
1141 | return 0; | |
1142 | } | |
1143 | ||
58d4185e | 1144 | /* initialises tx */ |
e2ebc74d JB |
1145 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control); |
1146 | ||
9ae54c84 | 1147 | if (res_prepare == TX_DROP) { |
e2ebc74d JB |
1148 | dev_kfree_skb(skb); |
1149 | return 0; | |
1150 | } | |
1151 | ||
d4e46a3d JB |
1152 | /* |
1153 | * key references are protected using RCU and this requires that | |
1154 | * we are in a read-site RCU section during receive processing | |
1155 | */ | |
1156 | rcu_read_lock(); | |
1157 | ||
e2ebc74d | 1158 | sta = tx.sta; |
5cf121c3 | 1159 | tx.channel = local->hw.conf.channel; |
e2ebc74d | 1160 | |
58905290 | 1161 | for (handler = ieee80211_tx_handlers; *handler != NULL; |
58d4185e JB |
1162 | handler++) { |
1163 | res = (*handler)(&tx); | |
9ae54c84 | 1164 | if (res != TX_CONTINUE) |
58d4185e | 1165 | break; |
e2ebc74d JB |
1166 | } |
1167 | ||
1168 | skb = tx.skb; /* handlers are allowed to change skb */ | |
1169 | ||
1170 | if (sta) | |
1171 | sta_info_put(sta); | |
1172 | ||
9ae54c84 | 1173 | if (unlikely(res == TX_DROP)) { |
e2ebc74d JB |
1174 | I802_DEBUG_INC(local->tx_handlers_drop); |
1175 | goto drop; | |
1176 | } | |
1177 | ||
9ae54c84 | 1178 | if (unlikely(res == TX_QUEUED)) { |
e2ebc74d | 1179 | I802_DEBUG_INC(local->tx_handlers_queued); |
d4e46a3d | 1180 | rcu_read_unlock(); |
e2ebc74d JB |
1181 | return 0; |
1182 | } | |
1183 | ||
5cf121c3 JB |
1184 | if (tx.extra_frag) { |
1185 | for (i = 0; i < tx.num_extra_frag; i++) { | |
e2ebc74d JB |
1186 | int next_len, dur; |
1187 | struct ieee80211_hdr *hdr = | |
1188 | (struct ieee80211_hdr *) | |
5cf121c3 | 1189 | tx.extra_frag[i]->data; |
e2ebc74d | 1190 | |
5cf121c3 JB |
1191 | if (i + 1 < tx.num_extra_frag) { |
1192 | next_len = tx.extra_frag[i + 1]->len; | |
e2ebc74d JB |
1193 | } else { |
1194 | next_len = 0; | |
5cf121c3 | 1195 | tx.rate = tx.last_frag_rate; |
e2ebc74d JB |
1196 | } |
1197 | dur = ieee80211_duration(&tx, 0, next_len); | |
1198 | hdr->duration_id = cpu_to_le16(dur); | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | retry: | |
1203 | ret = __ieee80211_tx(local, skb, &tx); | |
1204 | if (ret) { | |
1205 | struct ieee80211_tx_stored_packet *store = | |
1206 | &local->pending_packet[control->queue]; | |
1207 | ||
1208 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1209 | skb = NULL; | |
1210 | set_bit(IEEE80211_LINK_STATE_PENDING, | |
1211 | &local->state[control->queue]); | |
1212 | smp_mb(); | |
1213 | /* When the driver gets out of buffers during sending of | |
1214 | * fragments and calls ieee80211_stop_queue, there is | |
1215 | * a small window between IEEE80211_LINK_STATE_XOFF and | |
1216 | * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer | |
1217 | * gets available in that window (i.e. driver calls | |
1218 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
1219 | * called with IEEE80211_LINK_STATE_PENDING. Prevent this by | |
1220 | * continuing transmitting here when that situation is | |
1221 | * possible to have happened. */ | |
1222 | if (!__ieee80211_queue_stopped(local, control->queue)) { | |
1223 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1224 | &local->state[control->queue]); | |
1225 | goto retry; | |
1226 | } | |
1227 | memcpy(&store->control, control, | |
1228 | sizeof(struct ieee80211_tx_control)); | |
1229 | store->skb = skb; | |
5cf121c3 JB |
1230 | store->extra_frag = tx.extra_frag; |
1231 | store->num_extra_frag = tx.num_extra_frag; | |
1232 | store->last_frag_rate = tx.last_frag_rate; | |
badffb72 | 1233 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1234 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1235 | } |
d4e46a3d | 1236 | rcu_read_unlock(); |
e2ebc74d JB |
1237 | return 0; |
1238 | ||
1239 | drop: | |
1240 | if (skb) | |
1241 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1242 | for (i = 0; i < tx.num_extra_frag; i++) |
1243 | if (tx.extra_frag[i]) | |
1244 | dev_kfree_skb(tx.extra_frag[i]); | |
1245 | kfree(tx.extra_frag); | |
d4e46a3d | 1246 | rcu_read_unlock(); |
e2ebc74d JB |
1247 | return 0; |
1248 | } | |
1249 | ||
1250 | /* device xmit handlers */ | |
1251 | ||
1252 | int ieee80211_master_start_xmit(struct sk_buff *skb, | |
1253 | struct net_device *dev) | |
1254 | { | |
1255 | struct ieee80211_tx_control control; | |
1256 | struct ieee80211_tx_packet_data *pkt_data; | |
1257 | struct net_device *odev = NULL; | |
1258 | struct ieee80211_sub_if_data *osdata; | |
1259 | int headroom; | |
1260 | int ret; | |
1261 | ||
1262 | /* | |
1263 | * copy control out of the skb so other people can use skb->cb | |
1264 | */ | |
1265 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1266 | memset(&control, 0, sizeof(struct ieee80211_tx_control)); | |
1267 | ||
1268 | if (pkt_data->ifindex) | |
881d966b | 1269 | odev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1270 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1271 | dev_put(odev); | |
1272 | odev = NULL; | |
1273 | } | |
1274 | if (unlikely(!odev)) { | |
1275 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1276 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1277 | "originating device\n", dev->name); | |
1278 | #endif | |
1279 | dev_kfree_skb(skb); | |
1280 | return 0; | |
1281 | } | |
1282 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); | |
1283 | ||
1284 | headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM; | |
1285 | if (skb_headroom(skb) < headroom) { | |
1286 | if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { | |
1287 | dev_kfree_skb(skb); | |
1288 | dev_put(odev); | |
1289 | return 0; | |
1290 | } | |
1291 | } | |
1292 | ||
32bfd35d | 1293 | control.vif = &osdata->vif; |
51fb61e7 | 1294 | control.type = osdata->vif.type; |
e8bf9649 | 1295 | if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS) |
e2ebc74d | 1296 | control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS; |
e8bf9649 | 1297 | if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT) |
e2ebc74d | 1298 | control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
e8bf9649 | 1299 | if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) |
e2ebc74d | 1300 | control.flags |= IEEE80211_TXCTL_REQUEUE; |
678f5f71 JB |
1301 | if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME) |
1302 | control.flags |= IEEE80211_TXCTL_EAPOL_FRAME; | |
9e723492 RR |
1303 | if (pkt_data->flags & IEEE80211_TXPD_AMPDU) |
1304 | control.flags |= IEEE80211_TXCTL_AMPDU; | |
e2ebc74d JB |
1305 | control.queue = pkt_data->queue; |
1306 | ||
f9d540ee | 1307 | ret = ieee80211_tx(odev, skb, &control); |
e2ebc74d JB |
1308 | dev_put(odev); |
1309 | ||
1310 | return ret; | |
1311 | } | |
1312 | ||
1313 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1314 | struct net_device *dev) | |
1315 | { | |
1316 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1317 | struct ieee80211_tx_packet_data *pkt_data; | |
1318 | struct ieee80211_radiotap_header *prthdr = | |
1319 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1320 | u16 len_rthdr; |
e2ebc74d | 1321 | |
9b8a74e3 AG |
1322 | /* check for not even having the fixed radiotap header part */ |
1323 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1324 | goto fail; /* too short to be possibly valid */ | |
1325 | ||
1326 | /* is it a header version we can trust to find length from? */ | |
1327 | if (unlikely(prthdr->it_version)) | |
1328 | goto fail; /* only version 0 is supported */ | |
1329 | ||
1330 | /* then there must be a radiotap header with a length we can use */ | |
1331 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1332 | ||
1333 | /* does the skb contain enough to deliver on the alleged length? */ | |
1334 | if (unlikely(skb->len < len_rthdr)) | |
1335 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1336 | |
1337 | skb->dev = local->mdev; | |
1338 | ||
1339 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1340 | memset(pkt_data, 0, sizeof(*pkt_data)); | |
9b8a74e3 | 1341 | /* needed because we set skb device to master */ |
e2ebc74d | 1342 | pkt_data->ifindex = dev->ifindex; |
9b8a74e3 | 1343 | |
e8bf9649 | 1344 | pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT; |
e2ebc74d | 1345 | |
e2ebc74d JB |
1346 | /* |
1347 | * fix up the pointers accounting for the radiotap | |
1348 | * header still being in there. We are being given | |
1349 | * a precooked IEEE80211 header so no need for | |
1350 | * normal processing | |
1351 | */ | |
9b8a74e3 | 1352 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1353 | /* |
9b8a74e3 AG |
1354 | * these are just fixed to the end of the rt area since we |
1355 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1356 | */ |
9b8a74e3 AG |
1357 | skb_set_network_header(skb, len_rthdr); |
1358 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1359 | |
9b8a74e3 AG |
1360 | /* pass the radiotap header up to the next stage intact */ |
1361 | dev_queue_xmit(skb); | |
e2ebc74d | 1362 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1363 | |
1364 | fail: | |
1365 | dev_kfree_skb(skb); | |
1366 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1367 | } |
1368 | ||
1369 | /** | |
1370 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1371 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1372 | * @skb: packet to be sent | |
1373 | * @dev: incoming interface | |
1374 | * | |
1375 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1376 | * not be freed, and caller is responsible for either retrying later or freeing | |
1377 | * skb). | |
1378 | * | |
1379 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1380 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1381 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1382 | * transmission (through low-level driver). | |
1383 | */ | |
1384 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1385 | struct net_device *dev) | |
1386 | { | |
1387 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1388 | struct ieee80211_tx_packet_data *pkt_data; | |
1389 | struct ieee80211_sub_if_data *sdata; | |
1390 | int ret = 1, head_need; | |
33b64eb2 | 1391 | u16 ethertype, hdrlen, meshhdrlen = 0, fc; |
e2ebc74d | 1392 | struct ieee80211_hdr hdr; |
33b64eb2 | 1393 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1394 | const u8 *encaps_data; |
1395 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1396 | int nh_pos, h_pos; |
e2ebc74d | 1397 | struct sta_info *sta; |
ce3edf6d | 1398 | u32 sta_flags = 0; |
e2ebc74d JB |
1399 | |
1400 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1401 | if (unlikely(skb->len < ETH_HLEN)) { | |
1402 | printk(KERN_DEBUG "%s: short skb (len=%d)\n", | |
1403 | dev->name, skb->len); | |
1404 | ret = 0; | |
1405 | goto fail; | |
1406 | } | |
1407 | ||
1408 | nh_pos = skb_network_header(skb) - skb->data; | |
1409 | h_pos = skb_transport_header(skb) - skb->data; | |
1410 | ||
1411 | /* convert Ethernet header to proper 802.11 header (based on | |
1412 | * operation mode) */ | |
1413 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
e2ebc74d JB |
1414 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; |
1415 | ||
51fb61e7 | 1416 | switch (sdata->vif.type) { |
cf966838 JB |
1417 | case IEEE80211_IF_TYPE_AP: |
1418 | case IEEE80211_IF_TYPE_VLAN: | |
e2ebc74d JB |
1419 | fc |= IEEE80211_FCTL_FROMDS; |
1420 | /* DA BSSID SA */ | |
1421 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1422 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1423 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1424 | hdrlen = 24; | |
cf966838 JB |
1425 | break; |
1426 | case IEEE80211_IF_TYPE_WDS: | |
e2ebc74d JB |
1427 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; |
1428 | /* RA TA DA SA */ | |
1429 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1430 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1431 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1432 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1433 | hdrlen = 30; | |
cf966838 | 1434 | break; |
33b64eb2 LCC |
1435 | #ifdef CONFIG_MAC80211_MESH |
1436 | case IEEE80211_IF_TYPE_MESH_POINT: | |
1437 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; | |
1438 | /* RA TA DA SA */ | |
1439 | if (is_multicast_ether_addr(skb->data)) | |
1440 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1441 | else if (mesh_nexthop_lookup(hdr.addr1, skb, dev)) | |
1442 | return 0; | |
1443 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1444 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1445 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1446 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
1447 | /* Forwarded frame, keep mesh ttl and seqnum */ | |
1448 | struct ieee80211s_hdr *prev_meshhdr; | |
1449 | prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb); | |
1450 | meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr); | |
1451 | memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen); | |
1452 | sdata->u.sta.mshstats.fwded_frames++; | |
1453 | } else { | |
1454 | if (!sdata->u.sta.mshcfg.dot11MeshTTL) { | |
1455 | /* Do not send frames with mesh_ttl == 0 */ | |
1456 | sdata->u.sta.mshstats.dropped_frames_ttl++; | |
1457 | ret = 0; | |
1458 | goto fail; | |
1459 | } | |
1460 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
902acc78 | 1461 | sdata); |
33b64eb2 LCC |
1462 | } |
1463 | hdrlen = 30; | |
1464 | break; | |
1465 | #endif | |
cf966838 | 1466 | case IEEE80211_IF_TYPE_STA: |
e2ebc74d JB |
1467 | fc |= IEEE80211_FCTL_TODS; |
1468 | /* BSSID SA DA */ | |
1469 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1470 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1471 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1472 | hdrlen = 24; | |
cf966838 JB |
1473 | break; |
1474 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1475 | /* DA SA BSSID */ |
1476 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1477 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1478 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1479 | hdrlen = 24; | |
cf966838 JB |
1480 | break; |
1481 | default: | |
e2ebc74d JB |
1482 | ret = 0; |
1483 | goto fail; | |
1484 | } | |
1485 | ||
7d185b8b JB |
1486 | /* |
1487 | * There's no need to try to look up the destination | |
1488 | * if it is a multicast address (which can only happen | |
1489 | * in AP mode) | |
1490 | */ | |
1491 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
1492 | sta = sta_info_get(local, hdr.addr1); | |
1493 | if (sta) { | |
1494 | sta_flags = sta->flags; | |
1495 | sta_info_put(sta); | |
1496 | } | |
e2ebc74d JB |
1497 | } |
1498 | ||
ce3edf6d JB |
1499 | /* receiver is QoS enabled, use a QoS type frame */ |
1500 | if (sta_flags & WLAN_STA_WME) { | |
1501 | fc |= IEEE80211_STYPE_QOS_DATA; | |
1502 | hdrlen += 2; | |
1503 | } | |
1504 | ||
1505 | /* | |
238814fd JB |
1506 | * Drop unicast frames to unauthorised stations unless they are |
1507 | * EAPOL frames from the local station. | |
ce3edf6d | 1508 | */ |
238814fd | 1509 | if (unlikely(!is_multicast_ether_addr(hdr.addr1) && |
33b64eb2 LCC |
1510 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1511 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1512 | compare_ether_addr(dev->dev_addr, |
1513 | skb->data + ETH_ALEN) == 0))) { | |
1514 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1515 | DECLARE_MAC_BUF(mac); | |
1516 | ||
1517 | if (net_ratelimit()) | |
1518 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1519 | " (unauthorized port)\n", dev->name, | |
1520 | print_mac(mac, hdr.addr1)); | |
1521 | #endif | |
1522 | ||
1523 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1524 | ||
1525 | ret = 0; | |
1526 | goto fail; | |
1527 | } | |
1528 | ||
e2ebc74d JB |
1529 | hdr.frame_control = cpu_to_le16(fc); |
1530 | hdr.duration_id = 0; | |
1531 | hdr.seq_ctrl = 0; | |
1532 | ||
1533 | skip_header_bytes = ETH_HLEN; | |
1534 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1535 | encaps_data = bridge_tunnel_header; | |
1536 | encaps_len = sizeof(bridge_tunnel_header); | |
1537 | skip_header_bytes -= 2; | |
1538 | } else if (ethertype >= 0x600) { | |
1539 | encaps_data = rfc1042_header; | |
1540 | encaps_len = sizeof(rfc1042_header); | |
1541 | skip_header_bytes -= 2; | |
1542 | } else { | |
1543 | encaps_data = NULL; | |
1544 | encaps_len = 0; | |
1545 | } | |
1546 | ||
1547 | skb_pull(skb, skip_header_bytes); | |
1548 | nh_pos -= skip_header_bytes; | |
1549 | h_pos -= skip_header_bytes; | |
1550 | ||
1551 | /* TODO: implement support for fragments so that there is no need to | |
1552 | * reallocate and copy payload; it might be enough to support one | |
1553 | * extra fragment that would be copied in the beginning of the frame | |
1554 | * data.. anyway, it would be nice to include this into skb structure | |
1555 | * somehow | |
1556 | * | |
1557 | * There are few options for this: | |
1558 | * use skb->cb as an extra space for 802.11 header | |
1559 | * allocate new buffer if not enough headroom | |
1560 | * make sure that there is enough headroom in every skb by increasing | |
1561 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1562 | * alloc_skb() (net/core/skbuff.c) | |
1563 | */ | |
33b64eb2 | 1564 | head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom; |
e2ebc74d JB |
1565 | head_need -= skb_headroom(skb); |
1566 | ||
1567 | /* We are going to modify skb data, so make a copy of it if happens to | |
1568 | * be cloned. This could happen, e.g., with Linux bridge code passing | |
1569 | * us broadcast frames. */ | |
1570 | ||
1571 | if (head_need > 0 || skb_cloned(skb)) { | |
1572 | #if 0 | |
1573 | printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " | |
1574 | "of headroom\n", dev->name, head_need); | |
1575 | #endif | |
1576 | ||
1577 | if (skb_cloned(skb)) | |
1578 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1579 | else | |
1580 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1581 | /* Since we have to reallocate the buffer, make sure that there | |
1582 | * is enough room for possible WEP IV/ICV and TKIP (8 bytes | |
1583 | * before payload and 12 after). */ | |
1584 | if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8), | |
1585 | 12, GFP_ATOMIC)) { | |
1586 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer" | |
1587 | "\n", dev->name); | |
1588 | goto fail; | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | if (encaps_data) { | |
1593 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1594 | nh_pos += encaps_len; | |
1595 | h_pos += encaps_len; | |
1596 | } | |
c29b9b9b | 1597 | |
33b64eb2 LCC |
1598 | if (meshhdrlen > 0) { |
1599 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1600 | nh_pos += meshhdrlen; | |
1601 | h_pos += meshhdrlen; | |
1602 | } | |
1603 | ||
c29b9b9b JB |
1604 | if (fc & IEEE80211_STYPE_QOS_DATA) { |
1605 | __le16 *qos_control; | |
1606 | ||
1607 | qos_control = (__le16*) skb_push(skb, 2); | |
1608 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1609 | /* | |
1610 | * Maybe we could actually set some fields here, for now just | |
1611 | * initialise to zero to indicate no special operation. | |
1612 | */ | |
1613 | *qos_control = 0; | |
1614 | } else | |
1615 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1616 | ||
e2ebc74d JB |
1617 | nh_pos += hdrlen; |
1618 | h_pos += hdrlen; | |
1619 | ||
1620 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1621 | memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); | |
1622 | pkt_data->ifindex = dev->ifindex; | |
678f5f71 JB |
1623 | if (ethertype == ETH_P_PAE) |
1624 | pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME; | |
e2ebc74d JB |
1625 | |
1626 | skb->dev = local->mdev; | |
68aae116 SH |
1627 | dev->stats.tx_packets++; |
1628 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1629 | |
1630 | /* Update skb pointers to various headers since this modified frame | |
1631 | * is going to go through Linux networking code that may potentially | |
1632 | * need things like pointer to IP header. */ | |
1633 | skb_set_mac_header(skb, 0); | |
1634 | skb_set_network_header(skb, nh_pos); | |
1635 | skb_set_transport_header(skb, h_pos); | |
1636 | ||
1637 | dev->trans_start = jiffies; | |
1638 | dev_queue_xmit(skb); | |
1639 | ||
1640 | return 0; | |
1641 | ||
1642 | fail: | |
1643 | if (!ret) | |
1644 | dev_kfree_skb(skb); | |
1645 | ||
1646 | return ret; | |
1647 | } | |
1648 | ||
e2ebc74d JB |
1649 | /* helper functions for pending packets for when queues are stopped */ |
1650 | ||
1651 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) | |
1652 | { | |
1653 | int i, j; | |
1654 | struct ieee80211_tx_stored_packet *store; | |
1655 | ||
1656 | for (i = 0; i < local->hw.queues; i++) { | |
1657 | if (!__ieee80211_queue_pending(local, i)) | |
1658 | continue; | |
1659 | store = &local->pending_packet[i]; | |
1660 | kfree_skb(store->skb); | |
1661 | for (j = 0; j < store->num_extra_frag; j++) | |
1662 | kfree_skb(store->extra_frag[j]); | |
1663 | kfree(store->extra_frag); | |
1664 | clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]); | |
1665 | } | |
1666 | } | |
1667 | ||
1668 | void ieee80211_tx_pending(unsigned long data) | |
1669 | { | |
1670 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1671 | struct net_device *dev = local->mdev; | |
1672 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1673 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
1674 | int i, ret, reschedule = 0; |
1675 | ||
1676 | netif_tx_lock_bh(dev); | |
1677 | for (i = 0; i < local->hw.queues; i++) { | |
1678 | if (__ieee80211_queue_stopped(local, i)) | |
1679 | continue; | |
1680 | if (!__ieee80211_queue_pending(local, i)) { | |
1681 | reschedule = 1; | |
1682 | continue; | |
1683 | } | |
1684 | store = &local->pending_packet[i]; | |
5cf121c3 JB |
1685 | tx.control = &store->control; |
1686 | tx.extra_frag = store->extra_frag; | |
1687 | tx.num_extra_frag = store->num_extra_frag; | |
1688 | tx.last_frag_rate = store->last_frag_rate; | |
badffb72 JS |
1689 | tx.flags = 0; |
1690 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1691 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1692 | ret = __ieee80211_tx(local, store->skb, &tx); |
1693 | if (ret) { | |
1694 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1695 | store->skb = NULL; | |
1696 | } else { | |
1697 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1698 | &local->state[i]); | |
1699 | reschedule = 1; | |
1700 | } | |
1701 | } | |
1702 | netif_tx_unlock_bh(dev); | |
1703 | if (reschedule) { | |
1704 | if (!ieee80211_qdisc_installed(dev)) { | |
1705 | if (!__ieee80211_queue_stopped(local, 0)) | |
1706 | netif_wake_queue(dev); | |
1707 | } else | |
1708 | netif_schedule(dev); | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | /* functions for drivers to get certain frames */ | |
1713 | ||
1714 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1715 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1716 | struct sk_buff *skb, |
1717 | struct beacon_data *beacon) | |
e2ebc74d JB |
1718 | { |
1719 | u8 *pos, *tim; | |
1720 | int aid0 = 0; | |
1721 | int i, have_bits = 0, n1, n2; | |
1722 | ||
1723 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1724 | * mode. */ | |
be8755e1 | 1725 | read_lock_bh(&local->sta_lock); |
e2ebc74d JB |
1726 | if (atomic_read(&bss->num_sta_ps) > 0) |
1727 | /* in the hope that this is faster than | |
1728 | * checking byte-for-byte */ | |
1729 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1730 | IEEE80211_MAX_AID+1); | |
1731 | ||
1732 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1733 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1734 | else |
1735 | bss->dtim_count--; | |
1736 | ||
1737 | tim = pos = (u8 *) skb_put(skb, 6); | |
1738 | *pos++ = WLAN_EID_TIM; | |
1739 | *pos++ = 4; | |
1740 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1741 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1742 | |
1743 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1744 | aid0 = 1; | |
1745 | ||
1746 | if (have_bits) { | |
1747 | /* Find largest even number N1 so that bits numbered 1 through | |
1748 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1749 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1750 | n1 = 0; | |
1751 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1752 | if (bss->tim[i]) { | |
1753 | n1 = i & 0xfe; | |
1754 | break; | |
1755 | } | |
1756 | } | |
1757 | n2 = n1; | |
1758 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1759 | if (bss->tim[i]) { | |
1760 | n2 = i; | |
1761 | break; | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | /* Bitmap control */ | |
1766 | *pos++ = n1 | aid0; | |
1767 | /* Part Virt Bitmap */ | |
1768 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1769 | ||
1770 | tim[1] = n2 - n1 + 4; | |
1771 | skb_put(skb, n2 - n1); | |
1772 | } else { | |
1773 | *pos++ = aid0; /* Bitmap control */ | |
1774 | *pos++ = 0; /* Part Virt Bitmap */ | |
1775 | } | |
be8755e1 | 1776 | read_unlock_bh(&local->sta_lock); |
e2ebc74d JB |
1777 | } |
1778 | ||
32bfd35d JB |
1779 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
1780 | struct ieee80211_vif *vif, | |
e2ebc74d JB |
1781 | struct ieee80211_tx_control *control) |
1782 | { | |
1783 | struct ieee80211_local *local = hw_to_local(hw); | |
1784 | struct sk_buff *skb; | |
1785 | struct net_device *bdev; | |
1786 | struct ieee80211_sub_if_data *sdata = NULL; | |
1787 | struct ieee80211_if_ap *ap = NULL; | |
1abbe498 | 1788 | struct rate_selection rsel; |
5dfdaf58 | 1789 | struct beacon_data *beacon; |
8318d78a | 1790 | struct ieee80211_supported_band *sband; |
902acc78 | 1791 | struct ieee80211_mgmt *mgmt; |
33b64eb2 | 1792 | int *num_beacons; |
902acc78 JB |
1793 | bool err = true; |
1794 | u8 *pos; | |
8318d78a JB |
1795 | |
1796 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
5dfdaf58 JB |
1797 | |
1798 | rcu_read_lock(); | |
e2ebc74d | 1799 | |
32bfd35d JB |
1800 | sdata = vif_to_sdata(vif); |
1801 | bdev = sdata->dev; | |
e2ebc74d | 1802 | |
902acc78 | 1803 | if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
33b64eb2 LCC |
1804 | ap = &sdata->u.ap; |
1805 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1806 | if (ap && beacon) { |
1807 | /* | |
1808 | * headroom, head length, | |
1809 | * tail length and maximum TIM length | |
1810 | */ | |
1811 | skb = dev_alloc_skb(local->tx_headroom + | |
1812 | beacon->head_len + | |
1813 | beacon->tail_len + 256); | |
1814 | if (!skb) | |
1815 | goto out; | |
33b64eb2 | 1816 | |
902acc78 JB |
1817 | skb_reserve(skb, local->tx_headroom); |
1818 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1819 | beacon->head_len); | |
33b64eb2 | 1820 | |
902acc78 JB |
1821 | ieee80211_include_sequence(sdata, |
1822 | (struct ieee80211_hdr *)skb->data); | |
33b64eb2 | 1823 | |
902acc78 | 1824 | ieee80211_beacon_add_tim(local, ap, skb, beacon); |
33b64eb2 | 1825 | |
902acc78 JB |
1826 | if (beacon->tail) |
1827 | memcpy(skb_put(skb, beacon->tail_len), | |
1828 | beacon->tail, beacon->tail_len); | |
33b64eb2 | 1829 | |
902acc78 | 1830 | num_beacons = &ap->num_beacons; |
33b64eb2 | 1831 | |
902acc78 JB |
1832 | err = false; |
1833 | } | |
1834 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
1835 | /* headroom, head length, tail length and maximum TIM length */ | |
1836 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1837 | if (!skb) | |
1838 | goto out; | |
1839 | ||
1840 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1841 | mgmt = (struct ieee80211_mgmt *) | |
1842 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1843 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
1844 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
1845 | IEEE80211_STYPE_BEACON); | |
1846 | memset(mgmt->da, 0xff, ETH_ALEN); | |
1847 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1848 | /* BSSID is left zeroed, wildcard value */ | |
1849 | mgmt->u.beacon.beacon_int = | |
1850 | cpu_to_le16(local->hw.conf.beacon_int); | |
1851 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1852 | ||
1853 | pos = skb_put(skb, 2); | |
1854 | *pos++ = WLAN_EID_SSID; | |
1855 | *pos++ = 0x0; | |
1856 | ||
1857 | mesh_mgmt_ies_add(skb, sdata->dev); | |
33b64eb2 | 1858 | |
33b64eb2 | 1859 | num_beacons = &sdata->u.sta.num_beacons; |
33b64eb2 | 1860 | |
902acc78 | 1861 | err = false; |
33b64eb2 | 1862 | } |
5dfdaf58 | 1863 | |
33b64eb2 | 1864 | if (err) { |
e2ebc74d JB |
1865 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1866 | if (net_ratelimit()) | |
32bfd35d JB |
1867 | printk(KERN_DEBUG "no beacon data avail for %s\n", |
1868 | bdev->name); | |
e2ebc74d | 1869 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
5dfdaf58 JB |
1870 | skb = NULL; |
1871 | goto out; | |
e2ebc74d JB |
1872 | } |
1873 | ||
e2ebc74d | 1874 | if (control) { |
8318d78a | 1875 | rate_control_get_rate(local->mdev, sband, skb, &rsel); |
1abbe498 | 1876 | if (!rsel.rate) { |
e2ebc74d | 1877 | if (net_ratelimit()) { |
1abbe498 MN |
1878 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " |
1879 | "no rate found\n", | |
1880 | wiphy_name(local->hw.wiphy)); | |
e2ebc74d JB |
1881 | } |
1882 | dev_kfree_skb(skb); | |
5dfdaf58 JB |
1883 | skb = NULL; |
1884 | goto out; | |
e2ebc74d JB |
1885 | } |
1886 | ||
0f7054e3 | 1887 | control->vif = vif; |
8318d78a JB |
1888 | control->tx_rate = rsel.rate; |
1889 | if (sdata->bss_conf.use_short_preamble && | |
1890 | rsel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1891 | control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE; | |
e2ebc74d | 1892 | control->antenna_sel_tx = local->hw.conf.antenna_sel_tx; |
e2ebc74d JB |
1893 | control->flags |= IEEE80211_TXCTL_NO_ACK; |
1894 | control->retry_limit = 1; | |
d46e144b | 1895 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; |
e2ebc74d | 1896 | } |
33b64eb2 LCC |
1897 | (*num_beacons)++; |
1898 | out: | |
5dfdaf58 | 1899 | rcu_read_unlock(); |
e2ebc74d JB |
1900 | return skb; |
1901 | } | |
1902 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1903 | ||
32bfd35d | 1904 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d JB |
1905 | const void *frame, size_t frame_len, |
1906 | const struct ieee80211_tx_control *frame_txctl, | |
1907 | struct ieee80211_rts *rts) | |
1908 | { | |
1909 | const struct ieee80211_hdr *hdr = frame; | |
1910 | u16 fctl; | |
1911 | ||
1912 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS; | |
1913 | rts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1914 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1915 | frame_txctl); | |
e2ebc74d JB |
1916 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1917 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1918 | } | |
1919 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1920 | ||
32bfd35d | 1921 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d JB |
1922 | const void *frame, size_t frame_len, |
1923 | const struct ieee80211_tx_control *frame_txctl, | |
1924 | struct ieee80211_cts *cts) | |
1925 | { | |
1926 | const struct ieee80211_hdr *hdr = frame; | |
1927 | u16 fctl; | |
1928 | ||
1929 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS; | |
1930 | cts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1931 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1932 | frame_len, frame_txctl); | |
e2ebc74d JB |
1933 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1934 | } | |
1935 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1936 | ||
1937 | struct sk_buff * | |
32bfd35d JB |
1938 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
1939 | struct ieee80211_vif *vif, | |
e2ebc74d JB |
1940 | struct ieee80211_tx_control *control) |
1941 | { | |
1942 | struct ieee80211_local *local = hw_to_local(hw); | |
1943 | struct sk_buff *skb; | |
1944 | struct sta_info *sta; | |
1945 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1946 | struct ieee80211_tx_data tx; |
9ae54c84 | 1947 | ieee80211_tx_result res = TX_DROP; |
e2ebc74d JB |
1948 | struct net_device *bdev; |
1949 | struct ieee80211_sub_if_data *sdata; | |
1950 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 1951 | struct beacon_data *beacon; |
e2ebc74d | 1952 | |
32bfd35d JB |
1953 | sdata = vif_to_sdata(vif); |
1954 | bdev = sdata->dev; | |
1955 | ||
5dfdaf58 JB |
1956 | |
1957 | if (!bss) | |
e2ebc74d JB |
1958 | return NULL; |
1959 | ||
5dfdaf58 JB |
1960 | rcu_read_lock(); |
1961 | beacon = rcu_dereference(bss->beacon); | |
1962 | ||
1963 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || | |
1964 | !beacon->head) { | |
1965 | rcu_read_unlock(); | |
1966 | return NULL; | |
1967 | } | |
1968 | rcu_read_unlock(); | |
1969 | ||
e2ebc74d JB |
1970 | if (bss->dtim_count != 0) |
1971 | return NULL; /* send buffered bc/mc only after DTIM beacon */ | |
1972 | memset(control, 0, sizeof(*control)); | |
1973 | while (1) { | |
1974 | skb = skb_dequeue(&bss->ps_bc_buf); | |
1975 | if (!skb) | |
1976 | return NULL; | |
1977 | local->total_ps_buffered--; | |
1978 | ||
1979 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
1980 | struct ieee80211_hdr *hdr = | |
1981 | (struct ieee80211_hdr *) skb->data; | |
1982 | /* more buffered multicast/broadcast frames ==> set | |
1983 | * MoreData flag in IEEE 802.11 header to inform PS | |
1984 | * STAs */ | |
1985 | hdr->frame_control |= | |
1986 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
1987 | } | |
1988 | ||
58d4185e | 1989 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control)) |
e2ebc74d JB |
1990 | break; |
1991 | dev_kfree_skb_any(skb); | |
1992 | } | |
1993 | sta = tx.sta; | |
5cf121c3 JB |
1994 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
1995 | tx.channel = local->hw.conf.channel; | |
e2ebc74d | 1996 | |
58905290 | 1997 | for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) { |
e2ebc74d | 1998 | res = (*handler)(&tx); |
9ae54c84 | 1999 | if (res == TX_DROP || res == TX_QUEUED) |
e2ebc74d JB |
2000 | break; |
2001 | } | |
e2ebc74d JB |
2002 | skb = tx.skb; /* handlers are allowed to change skb */ |
2003 | ||
9ae54c84 | 2004 | if (res == TX_DROP) { |
e2ebc74d JB |
2005 | I802_DEBUG_INC(local->tx_handlers_drop); |
2006 | dev_kfree_skb(skb); | |
2007 | skb = NULL; | |
9ae54c84 | 2008 | } else if (res == TX_QUEUED) { |
e2ebc74d JB |
2009 | I802_DEBUG_INC(local->tx_handlers_queued); |
2010 | skb = NULL; | |
2011 | } | |
2012 | ||
2013 | if (sta) | |
2014 | sta_info_put(sta); | |
2015 | ||
2016 | return skb; | |
2017 | } | |
2018 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |