Commit | Line | Data |
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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 | } | |
e2ebc74d | 330 | |
d0709a65 | 331 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
332 | skb = skb_dequeue(&sta->ps_tx_buf); |
333 | if (skb) { | |
334 | purged++; | |
335 | dev_kfree_skb(skb); | |
336 | } | |
337 | total += skb_queue_len(&sta->ps_tx_buf); | |
338 | } | |
d0709a65 JB |
339 | |
340 | rcu_read_unlock(); | |
e2ebc74d JB |
341 | |
342 | local->total_ps_buffered = total; | |
343 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", | |
dd1cd4c6 | 344 | wiphy_name(local->hw.wiphy), purged); |
e2ebc74d JB |
345 | } |
346 | ||
9ae54c84 | 347 | static ieee80211_tx_result |
5cf121c3 | 348 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 349 | { |
7d54d0dd JB |
350 | /* |
351 | * broadcast/multicast frame | |
352 | * | |
353 | * If any of the associated stations is in power save mode, | |
354 | * the frame is buffered to be sent after DTIM beacon frame. | |
355 | * This is done either by the hardware or us. | |
356 | */ | |
357 | ||
358 | /* not AP/IBSS or ordered frame */ | |
359 | if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER)) | |
9ae54c84 | 360 | return TX_CONTINUE; |
7d54d0dd JB |
361 | |
362 | /* no stations in PS mode */ | |
363 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 364 | return TX_CONTINUE; |
7d54d0dd JB |
365 | |
366 | /* buffered in mac80211 */ | |
367 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
368 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
369 | purge_old_ps_buffers(tx->local); | |
370 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
371 | AP_MAX_BC_BUFFER) { | |
372 | if (net_ratelimit()) { | |
373 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
374 | "dropping the oldest frame\n", | |
375 | tx->dev->name); | |
376 | } | |
377 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); | |
378 | } else | |
379 | tx->local->total_ps_buffered++; | |
380 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 381 | return TX_QUEUED; |
e2ebc74d JB |
382 | } |
383 | ||
7d54d0dd | 384 | /* buffered in hardware */ |
5cf121c3 | 385 | tx->control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM; |
7d54d0dd | 386 | |
9ae54c84 | 387 | return TX_CONTINUE; |
e2ebc74d JB |
388 | } |
389 | ||
9ae54c84 | 390 | static ieee80211_tx_result |
5cf121c3 | 391 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
392 | { |
393 | struct sta_info *sta = tx->sta; | |
0795af57 | 394 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
395 | |
396 | if (unlikely(!sta || | |
397 | ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && | |
398 | (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) | |
9ae54c84 | 399 | return TX_CONTINUE; |
e2ebc74d | 400 | |
4a9a66e9 JB |
401 | if (unlikely((sta->flags & WLAN_STA_PS) && |
402 | !(sta->flags & WLAN_STA_PSPOLL))) { | |
e2ebc74d JB |
403 | struct ieee80211_tx_packet_data *pkt_data; |
404 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 405 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 406 | "before %d)\n", |
0795af57 | 407 | print_mac(mac, sta->addr), sta->aid, |
e2ebc74d JB |
408 | skb_queue_len(&sta->ps_tx_buf)); |
409 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
410 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
411 | purge_old_ps_buffers(tx->local); | |
412 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
413 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
414 | if (net_ratelimit()) { | |
0795af57 | 415 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 416 | "buffer full - dropping oldest frame\n", |
0795af57 | 417 | tx->dev->name, print_mac(mac, sta->addr)); |
e2ebc74d JB |
418 | } |
419 | dev_kfree_skb(old); | |
420 | } else | |
421 | tx->local->total_ps_buffered++; | |
004c872e | 422 | |
e2ebc74d | 423 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
424 | if (skb_queue_empty(&sta->ps_tx_buf)) |
425 | sta_info_set_tim_bit(sta); | |
426 | ||
e2ebc74d JB |
427 | pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb; |
428 | pkt_data->jiffies = jiffies; | |
429 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); | |
9ae54c84 | 430 | return TX_QUEUED; |
e2ebc74d JB |
431 | } |
432 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
433 | else if (unlikely(sta->flags & WLAN_STA_PS)) { | |
0795af57 | 434 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 435 | "set -> send frame\n", tx->dev->name, |
0795af57 | 436 | print_mac(mac, sta->addr)); |
e2ebc74d JB |
437 | } |
438 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
4a9a66e9 | 439 | sta->flags &= ~WLAN_STA_PSPOLL; |
e2ebc74d | 440 | |
9ae54c84 | 441 | return TX_CONTINUE; |
e2ebc74d JB |
442 | } |
443 | ||
9ae54c84 | 444 | static ieee80211_tx_result |
5cf121c3 | 445 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 446 | { |
5cf121c3 | 447 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 448 | return TX_CONTINUE; |
e2ebc74d | 449 | |
5cf121c3 | 450 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
451 | return ieee80211_tx_h_unicast_ps_buf(tx); |
452 | else | |
453 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
454 | } | |
455 | ||
9ae54c84 | 456 | static ieee80211_tx_result |
5cf121c3 | 457 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 458 | { |
d4e46a3d | 459 | struct ieee80211_key *key; |
176e4f84 | 460 | u16 fc = tx->fc; |
d4e46a3d | 461 | |
5cf121c3 | 462 | if (unlikely(tx->control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)) |
e2ebc74d | 463 | tx->key = NULL; |
d4e46a3d JB |
464 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
465 | tx->key = key; | |
466 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
467 | tx->key = key; | |
e2ebc74d | 468 | else if (tx->sdata->drop_unencrypted && |
5cf121c3 JB |
469 | !(tx->control->flags & IEEE80211_TXCTL_EAPOL_FRAME) && |
470 | !(tx->flags & IEEE80211_TX_INJECTED)) { | |
e2ebc74d | 471 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 472 | return TX_DROP; |
176e4f84 | 473 | } else |
e2ebc74d JB |
474 | tx->key = NULL; |
475 | ||
476 | if (tx->key) { | |
176e4f84 JB |
477 | u16 ftype, stype; |
478 | ||
e2ebc74d | 479 | tx->key->tx_rx_count++; |
011bfcc4 | 480 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
481 | |
482 | switch (tx->key->conf.alg) { | |
483 | case ALG_WEP: | |
484 | ftype = fc & IEEE80211_FCTL_FTYPE; | |
485 | stype = fc & IEEE80211_FCTL_STYPE; | |
486 | ||
487 | if (ftype == IEEE80211_FTYPE_MGMT && | |
488 | stype == IEEE80211_STYPE_AUTH) | |
489 | break; | |
490 | case ALG_TKIP: | |
491 | case ALG_CCMP: | |
492 | if (!WLAN_FC_DATA_PRESENT(fc)) | |
493 | tx->key = NULL; | |
494 | break; | |
495 | } | |
e2ebc74d JB |
496 | } |
497 | ||
176e4f84 | 498 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
5cf121c3 | 499 | tx->control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
176e4f84 | 500 | |
9ae54c84 | 501 | return TX_CONTINUE; |
e2ebc74d JB |
502 | } |
503 | ||
9ae54c84 | 504 | static ieee80211_tx_result |
5cf121c3 | 505 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
506 | { |
507 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
508 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; | |
509 | struct sk_buff **frags, *first, *frag; | |
510 | int i; | |
511 | u16 seq; | |
512 | u8 *pos; | |
513 | int frag_threshold = tx->local->fragmentation_threshold; | |
514 | ||
5cf121c3 | 515 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) |
9ae54c84 | 516 | return TX_CONTINUE; |
e2ebc74d JB |
517 | |
518 | first = tx->skb; | |
519 | ||
520 | hdrlen = ieee80211_get_hdrlen(tx->fc); | |
521 | payload_len = first->len - hdrlen; | |
522 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
172589cc | 523 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); |
e2ebc74d JB |
524 | |
525 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
526 | if (!frags) | |
527 | goto fail; | |
528 | ||
529 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
530 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
531 | pos = first->data + hdrlen + per_fragm; | |
532 | left = payload_len - per_fragm; | |
533 | for (i = 0; i < num_fragm - 1; i++) { | |
534 | struct ieee80211_hdr *fhdr; | |
535 | size_t copylen; | |
536 | ||
537 | if (left <= 0) | |
538 | goto fail; | |
539 | ||
540 | /* reserve enough extra head and tail room for possible | |
541 | * encryption */ | |
542 | frag = frags[i] = | |
543 | dev_alloc_skb(tx->local->tx_headroom + | |
544 | frag_threshold + | |
545 | IEEE80211_ENCRYPT_HEADROOM + | |
546 | IEEE80211_ENCRYPT_TAILROOM); | |
547 | if (!frag) | |
548 | goto fail; | |
549 | /* Make sure that all fragments use the same priority so | |
550 | * that they end up using the same TX queue */ | |
551 | frag->priority = first->priority; | |
552 | skb_reserve(frag, tx->local->tx_headroom + | |
553 | IEEE80211_ENCRYPT_HEADROOM); | |
554 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
555 | memcpy(fhdr, first->data, hdrlen); | |
556 | if (i == num_fragm - 2) | |
557 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
558 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
559 | copylen = left > per_fragm ? per_fragm : left; | |
560 | memcpy(skb_put(frag, copylen), pos, copylen); | |
561 | ||
562 | pos += copylen; | |
563 | left -= copylen; | |
564 | } | |
565 | skb_trim(first, hdrlen + per_fragm); | |
566 | ||
5cf121c3 JB |
567 | tx->num_extra_frag = num_fragm - 1; |
568 | tx->extra_frag = frags; | |
e2ebc74d | 569 | |
9ae54c84 | 570 | return TX_CONTINUE; |
e2ebc74d JB |
571 | |
572 | fail: | |
573 | printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); | |
574 | if (frags) { | |
575 | for (i = 0; i < num_fragm - 1; i++) | |
576 | if (frags[i]) | |
577 | dev_kfree_skb(frags[i]); | |
578 | kfree(frags); | |
579 | } | |
580 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
9ae54c84 | 581 | return TX_DROP; |
e2ebc74d JB |
582 | } |
583 | ||
9ae54c84 | 584 | static ieee80211_tx_result |
5cf121c3 | 585 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
e2ebc74d | 586 | { |
6a22a59d | 587 | if (!tx->key) |
9ae54c84 | 588 | return TX_CONTINUE; |
e2ebc74d | 589 | |
6a22a59d JB |
590 | switch (tx->key->conf.alg) { |
591 | case ALG_WEP: | |
592 | return ieee80211_crypto_wep_encrypt(tx); | |
593 | case ALG_TKIP: | |
594 | return ieee80211_crypto_tkip_encrypt(tx); | |
595 | case ALG_CCMP: | |
596 | return ieee80211_crypto_ccmp_encrypt(tx); | |
e2ebc74d JB |
597 | } |
598 | ||
6a22a59d JB |
599 | /* not reached */ |
600 | WARN_ON(1); | |
9ae54c84 | 601 | return TX_DROP; |
e2ebc74d JB |
602 | } |
603 | ||
9ae54c84 | 604 | static ieee80211_tx_result |
5cf121c3 | 605 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 606 | { |
1abbe498 | 607 | struct rate_selection rsel; |
8318d78a JB |
608 | struct ieee80211_supported_band *sband; |
609 | ||
610 | sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band]; | |
e2ebc74d | 611 | |
5cf121c3 | 612 | if (likely(!tx->rate)) { |
8318d78a | 613 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
5cf121c3 | 614 | tx->rate = rsel.rate; |
8318d78a | 615 | if (unlikely(rsel.probe)) { |
5cf121c3 | 616 | tx->control->flags |= |
58d4185e | 617 | IEEE80211_TXCTL_RATE_CTRL_PROBE; |
5cf121c3 JB |
618 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
619 | tx->control->alt_retry_rate = tx->rate; | |
620 | tx->rate = rsel.probe; | |
58d4185e | 621 | } else |
5cf121c3 | 622 | tx->control->alt_retry_rate = NULL; |
58d4185e | 623 | |
5cf121c3 | 624 | if (!tx->rate) |
9ae54c84 | 625 | return TX_DROP; |
58d4185e | 626 | } else |
5cf121c3 | 627 | tx->control->alt_retry_rate = NULL; |
58d4185e | 628 | |
8318d78a | 629 | if (tx->sdata->bss_conf.use_cts_prot && |
5cf121c3 JB |
630 | (tx->flags & IEEE80211_TX_FRAGMENTED) && rsel.nonerp) { |
631 | tx->last_frag_rate = tx->rate; | |
1abbe498 | 632 | if (rsel.probe) |
5cf121c3 | 633 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 634 | else |
5cf121c3 JB |
635 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
636 | tx->rate = rsel.nonerp; | |
637 | tx->control->tx_rate = rsel.nonerp; | |
638 | tx->control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
e2ebc74d | 639 | } else { |
5cf121c3 JB |
640 | tx->last_frag_rate = tx->rate; |
641 | tx->control->tx_rate = tx->rate; | |
e2ebc74d | 642 | } |
5cf121c3 | 643 | tx->control->tx_rate = tx->rate; |
e2ebc74d | 644 | |
9ae54c84 | 645 | return TX_CONTINUE; |
e2ebc74d JB |
646 | } |
647 | ||
9ae54c84 | 648 | static ieee80211_tx_result |
5cf121c3 | 649 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
650 | { |
651 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
7e9ed188 | 652 | u16 fc = le16_to_cpu(hdr->frame_control); |
e2ebc74d | 653 | u16 dur; |
5cf121c3 | 654 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d | 655 | |
58d4185e JB |
656 | if (!control->retry_limit) { |
657 | if (!is_multicast_ether_addr(hdr->addr1)) { | |
658 | if (tx->skb->len + FCS_LEN > tx->local->rts_threshold | |
659 | && tx->local->rts_threshold < | |
660 | IEEE80211_MAX_RTS_THRESHOLD) { | |
661 | control->flags |= | |
662 | IEEE80211_TXCTL_USE_RTS_CTS; | |
663 | control->flags |= | |
664 | IEEE80211_TXCTL_LONG_RETRY_LIMIT; | |
665 | control->retry_limit = | |
666 | tx->local->long_retry_limit; | |
667 | } else { | |
668 | control->retry_limit = | |
669 | tx->local->short_retry_limit; | |
670 | } | |
e2ebc74d | 671 | } else { |
58d4185e | 672 | control->retry_limit = 1; |
e2ebc74d | 673 | } |
e2ebc74d JB |
674 | } |
675 | ||
5cf121c3 | 676 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
677 | /* Do not use multiple retry rates when sending fragmented |
678 | * frames. | |
679 | * TODO: The last fragment could still use multiple retry | |
680 | * rates. */ | |
8318d78a | 681 | control->alt_retry_rate = NULL; |
e2ebc74d JB |
682 | } |
683 | ||
684 | /* Use CTS protection for unicast frames sent using extended rates if | |
685 | * there are associated non-ERP stations and RTS/CTS is not configured | |
686 | * for the frame. */ | |
8318d78a | 687 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
5cf121c3 JB |
688 | (tx->rate->flags & IEEE80211_RATE_ERP_G) && |
689 | (tx->flags & IEEE80211_TX_UNICAST) && | |
471b3efd | 690 | tx->sdata->bss_conf.use_cts_prot && |
e2ebc74d JB |
691 | !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS)) |
692 | control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT; | |
693 | ||
7e9ed188 DD |
694 | /* Transmit data frames using short preambles if the driver supports |
695 | * short preambles at the selected rate and short preambles are | |
696 | * available on the network at the current point in time. */ | |
697 | if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
5cf121c3 | 698 | (tx->rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 699 | tx->sdata->bss_conf.use_short_preamble && |
7e9ed188 | 700 | (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) { |
5cf121c3 | 701 | tx->control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE; |
7e9ed188 DD |
702 | } |
703 | ||
e2ebc74d JB |
704 | /* Setup duration field for the first fragment of the frame. Duration |
705 | * for remaining fragments will be updated when they are being sent | |
706 | * to low-level driver in ieee80211_tx(). */ | |
707 | dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1), | |
5cf121c3 JB |
708 | (tx->flags & IEEE80211_TX_FRAGMENTED) ? |
709 | tx->extra_frag[0]->len : 0); | |
e2ebc74d JB |
710 | hdr->duration_id = cpu_to_le16(dur); |
711 | ||
712 | if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) || | |
713 | (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) { | |
8318d78a JB |
714 | struct ieee80211_supported_band *sband; |
715 | struct ieee80211_rate *rate, *baserate; | |
716 | int idx; | |
717 | ||
718 | sband = tx->local->hw.wiphy->bands[ | |
719 | tx->local->hw.conf.channel->band]; | |
e2ebc74d JB |
720 | |
721 | /* Do not use multiple retry rates when using RTS/CTS */ | |
8318d78a | 722 | control->alt_retry_rate = NULL; |
e2ebc74d JB |
723 | |
724 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
5cf121c3 | 725 | rate = tx->rate; |
8318d78a JB |
726 | baserate = NULL; |
727 | ||
728 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
729 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
730 | continue; | |
731 | if (tx->sdata->basic_rates & BIT(idx) && | |
732 | (!baserate || | |
733 | (baserate->bitrate < sband->bitrates[idx].bitrate))) | |
734 | baserate = &sband->bitrates[idx]; | |
735 | } | |
e2ebc74d | 736 | |
8318d78a JB |
737 | if (baserate) |
738 | control->rts_cts_rate = baserate; | |
739 | else | |
740 | control->rts_cts_rate = &sband->bitrates[0]; | |
e2ebc74d JB |
741 | } |
742 | ||
743 | if (tx->sta) { | |
744 | tx->sta->tx_packets++; | |
745 | tx->sta->tx_fragments++; | |
746 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 747 | if (tx->extra_frag) { |
e2ebc74d | 748 | int i; |
5cf121c3 JB |
749 | tx->sta->tx_fragments += tx->num_extra_frag; |
750 | for (i = 0; i < tx->num_extra_frag; i++) { | |
e2ebc74d | 751 | tx->sta->tx_bytes += |
5cf121c3 | 752 | tx->extra_frag[i]->len; |
e2ebc74d JB |
753 | } |
754 | } | |
755 | } | |
756 | ||
9ae54c84 | 757 | return TX_CONTINUE; |
e2ebc74d JB |
758 | } |
759 | ||
9ae54c84 | 760 | static ieee80211_tx_result |
5cf121c3 | 761 | ieee80211_tx_h_load_stats(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
762 | { |
763 | struct ieee80211_local *local = tx->local; | |
e2ebc74d JB |
764 | struct sk_buff *skb = tx->skb; |
765 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
766 | u32 load = 0, hdrtime; | |
5cf121c3 | 767 | struct ieee80211_rate *rate = tx->rate; |
e2ebc74d JB |
768 | |
769 | /* TODO: this could be part of tx_status handling, so that the number | |
770 | * of retries would be known; TX rate should in that case be stored | |
771 | * somewhere with the packet */ | |
772 | ||
773 | /* Estimate total channel use caused by this frame */ | |
774 | ||
775 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
776 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
777 | ||
5cf121c3 JB |
778 | if (tx->channel->band == IEEE80211_BAND_5GHZ || |
779 | (tx->channel->band == IEEE80211_BAND_2GHZ && | |
8318d78a | 780 | rate->flags & IEEE80211_RATE_ERP_G)) |
e2ebc74d JB |
781 | hdrtime = CHAN_UTIL_HDR_SHORT; |
782 | else | |
783 | hdrtime = CHAN_UTIL_HDR_LONG; | |
784 | ||
785 | load = hdrtime; | |
786 | if (!is_multicast_ether_addr(hdr->addr1)) | |
787 | load += hdrtime; | |
788 | ||
5cf121c3 | 789 | if (tx->control->flags & IEEE80211_TXCTL_USE_RTS_CTS) |
e2ebc74d | 790 | load += 2 * hdrtime; |
5cf121c3 | 791 | else if (tx->control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) |
e2ebc74d JB |
792 | load += hdrtime; |
793 | ||
8318d78a JB |
794 | /* TODO: optimise again */ |
795 | load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate; | |
e2ebc74d | 796 | |
5cf121c3 | 797 | if (tx->extra_frag) { |
e2ebc74d | 798 | int i; |
5cf121c3 | 799 | for (i = 0; i < tx->num_extra_frag; i++) { |
e2ebc74d | 800 | load += 2 * hdrtime; |
5cf121c3 JB |
801 | load += tx->extra_frag[i]->len * |
802 | tx->rate->bitrate; | |
e2ebc74d JB |
803 | } |
804 | } | |
805 | ||
806 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
807 | load >>= CHAN_UTIL_SHIFT; | |
808 | local->channel_use_raw += load; | |
809 | if (tx->sta) | |
810 | tx->sta->channel_use_raw += load; | |
811 | tx->sdata->channel_use_raw += load; | |
812 | ||
9ae54c84 | 813 | return TX_CONTINUE; |
e2ebc74d JB |
814 | } |
815 | ||
e2ebc74d | 816 | |
5cf121c3 | 817 | typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *); |
58905290 | 818 | static ieee80211_tx_handler ieee80211_tx_handlers[] = |
e2ebc74d JB |
819 | { |
820 | ieee80211_tx_h_check_assoc, | |
821 | ieee80211_tx_h_sequence, | |
822 | ieee80211_tx_h_ps_buf, | |
823 | ieee80211_tx_h_select_key, | |
824 | ieee80211_tx_h_michael_mic_add, | |
825 | ieee80211_tx_h_fragment, | |
6a22a59d | 826 | ieee80211_tx_h_encrypt, |
e2ebc74d JB |
827 | ieee80211_tx_h_rate_ctrl, |
828 | ieee80211_tx_h_misc, | |
829 | ieee80211_tx_h_load_stats, | |
830 | NULL | |
831 | }; | |
832 | ||
833 | /* actual transmit path */ | |
834 | ||
835 | /* | |
836 | * deal with packet injection down monitor interface | |
837 | * with Radiotap Header -- only called for monitor mode interface | |
838 | */ | |
9ae54c84 | 839 | static ieee80211_tx_result |
5cf121c3 | 840 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 841 | struct sk_buff *skb) |
e2ebc74d JB |
842 | { |
843 | /* | |
844 | * this is the moment to interpret and discard the radiotap header that | |
845 | * must be at the start of the packet injected in Monitor mode | |
846 | * | |
847 | * Need to take some care with endian-ness since radiotap | |
848 | * args are little-endian | |
849 | */ | |
850 | ||
851 | struct ieee80211_radiotap_iterator iterator; | |
852 | struct ieee80211_radiotap_header *rthdr = | |
853 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 854 | struct ieee80211_supported_band *sband; |
e2ebc74d | 855 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
5cf121c3 | 856 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d | 857 | |
8318d78a JB |
858 | sband = tx->local->hw.wiphy->bands[tx->local->hw.conf.channel->band]; |
859 | ||
58d4185e | 860 | control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
5cf121c3 JB |
861 | tx->flags |= IEEE80211_TX_INJECTED; |
862 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; | |
e2ebc74d JB |
863 | |
864 | /* | |
865 | * for every radiotap entry that is present | |
866 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
867 | * entries present, or -EINVAL on error) | |
868 | */ | |
869 | ||
870 | while (!ret) { | |
871 | int i, target_rate; | |
872 | ||
873 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
874 | ||
875 | if (ret) | |
876 | continue; | |
877 | ||
878 | /* see if this argument is something we can use */ | |
879 | switch (iterator.this_arg_index) { | |
880 | /* | |
881 | * You must take care when dereferencing iterator.this_arg | |
882 | * for multibyte types... the pointer is not aligned. Use | |
883 | * get_unaligned((type *)iterator.this_arg) to dereference | |
884 | * iterator.this_arg for type "type" safely on all arches. | |
885 | */ | |
886 | case IEEE80211_RADIOTAP_RATE: | |
887 | /* | |
888 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
889 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
890 | */ | |
891 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
892 | for (i = 0; i < sband->n_bitrates; i++) { |
893 | struct ieee80211_rate *r; | |
e2ebc74d | 894 | |
8318d78a JB |
895 | r = &sband->bitrates[i]; |
896 | ||
897 | if (r->bitrate == target_rate) { | |
5cf121c3 | 898 | tx->rate = r; |
58d4185e JB |
899 | break; |
900 | } | |
e2ebc74d JB |
901 | } |
902 | break; | |
903 | ||
904 | case IEEE80211_RADIOTAP_ANTENNA: | |
905 | /* | |
906 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
907 | * 1st ant | |
908 | */ | |
909 | control->antenna_sel_tx = (*iterator.this_arg) + 1; | |
910 | break; | |
911 | ||
8318d78a | 912 | #if 0 |
e2ebc74d JB |
913 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
914 | control->power_level = *iterator.this_arg; | |
915 | break; | |
8318d78a | 916 | #endif |
e2ebc74d JB |
917 | |
918 | case IEEE80211_RADIOTAP_FLAGS: | |
919 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
920 | /* | |
921 | * this indicates that the skb we have been | |
922 | * handed has the 32-bit FCS CRC at the end... | |
923 | * we should react to that by snipping it off | |
924 | * because it will be recomputed and added | |
925 | * on transmission | |
926 | */ | |
927 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 928 | return TX_DROP; |
e2ebc74d JB |
929 | |
930 | skb_trim(skb, skb->len - FCS_LEN); | |
931 | } | |
58d4185e JB |
932 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
933 | control->flags &= | |
934 | ~IEEE80211_TXCTL_DO_NOT_ENCRYPT; | |
935 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) | |
5cf121c3 | 936 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
937 | break; |
938 | ||
58d4185e JB |
939 | /* |
940 | * Please update the file | |
941 | * Documentation/networking/mac80211-injection.txt | |
942 | * when parsing new fields here. | |
943 | */ | |
944 | ||
e2ebc74d JB |
945 | default: |
946 | break; | |
947 | } | |
948 | } | |
949 | ||
950 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 951 | return TX_DROP; |
e2ebc74d JB |
952 | |
953 | /* | |
954 | * remove the radiotap header | |
955 | * iterator->max_length was sanity-checked against | |
956 | * skb->len by iterator init | |
957 | */ | |
958 | skb_pull(skb, iterator.max_length); | |
959 | ||
9ae54c84 | 960 | return TX_CONTINUE; |
e2ebc74d JB |
961 | } |
962 | ||
58d4185e JB |
963 | /* |
964 | * initialises @tx | |
965 | */ | |
9ae54c84 | 966 | static ieee80211_tx_result |
5cf121c3 | 967 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d JB |
968 | struct sk_buff *skb, |
969 | struct net_device *dev, | |
970 | struct ieee80211_tx_control *control) | |
971 | { | |
972 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 973 | struct ieee80211_hdr *hdr; |
e2ebc74d | 974 | struct ieee80211_sub_if_data *sdata; |
e2ebc74d JB |
975 | |
976 | int hdrlen; | |
977 | ||
978 | memset(tx, 0, sizeof(*tx)); | |
979 | tx->skb = skb; | |
980 | tx->dev = dev; /* use original interface */ | |
981 | tx->local = local; | |
982 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
5cf121c3 | 983 | tx->control = control; |
e2ebc74d | 984 | /* |
58d4185e JB |
985 | * Set this flag (used below to indicate "automatic fragmentation"), |
986 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 987 | */ |
5cf121c3 | 988 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
989 | |
990 | /* process and remove the injection radiotap header */ | |
991 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
51fb61e7 | 992 | if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { |
9ae54c84 JB |
993 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
994 | return TX_DROP; | |
58d4185e | 995 | |
e2ebc74d | 996 | /* |
58d4185e JB |
997 | * __ieee80211_parse_tx_radiotap has now removed |
998 | * the radiotap header that was present and pre-filled | |
999 | * 'tx' with tx control information. | |
e2ebc74d | 1000 | */ |
e2ebc74d JB |
1001 | } |
1002 | ||
58d4185e JB |
1003 | hdr = (struct ieee80211_hdr *) skb->data; |
1004 | ||
24338793 | 1005 | tx->sta = sta_info_get(local, hdr->addr1); |
1006 | tx->fc = le16_to_cpu(hdr->frame_control); | |
58d4185e | 1007 | |
badffb72 | 1008 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1009 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e2ebc74d | 1010 | control->flags |= IEEE80211_TXCTL_NO_ACK; |
badffb72 | 1011 | } else { |
5cf121c3 | 1012 | tx->flags |= IEEE80211_TX_UNICAST; |
e2ebc74d | 1013 | control->flags &= ~IEEE80211_TXCTL_NO_ACK; |
badffb72 | 1014 | } |
58d4185e | 1015 | |
5cf121c3 JB |
1016 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1017 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e JB |
1018 | skb->len + FCS_LEN > local->fragmentation_threshold && |
1019 | !local->ops->set_frag_threshold) | |
5cf121c3 | 1020 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1021 | else |
5cf121c3 | 1022 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1023 | } |
1024 | ||
e2ebc74d | 1025 | if (!tx->sta) |
d46e144b JB |
1026 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; |
1027 | else if (tx->sta->flags & WLAN_STA_CLEAR_PS_FILT) { | |
1028 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; | |
1029 | tx->sta->flags &= ~WLAN_STA_CLEAR_PS_FILT; | |
e2ebc74d | 1030 | } |
58d4185e | 1031 | |
e2ebc74d JB |
1032 | hdrlen = ieee80211_get_hdrlen(tx->fc); |
1033 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { | |
1034 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1035 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1036 | } | |
1037 | control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT; | |
1038 | ||
9ae54c84 | 1039 | return TX_CONTINUE; |
e2ebc74d JB |
1040 | } |
1041 | ||
32bfd35d | 1042 | /* |
58d4185e JB |
1043 | * NB: @tx is uninitialised when passed in here |
1044 | */ | |
5cf121c3 | 1045 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e JB |
1046 | struct sk_buff *skb, |
1047 | struct net_device *mdev, | |
1048 | struct ieee80211_tx_control *control) | |
e2ebc74d JB |
1049 | { |
1050 | struct ieee80211_tx_packet_data *pkt_data; | |
1051 | struct net_device *dev; | |
1052 | ||
1053 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
881d966b | 1054 | dev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1055 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1056 | dev_put(dev); | |
1057 | dev = NULL; | |
1058 | } | |
1059 | if (unlikely(!dev)) | |
1060 | return -ENODEV; | |
58d4185e | 1061 | /* initialises tx with control */ |
e2ebc74d | 1062 | __ieee80211_tx_prepare(tx, skb, dev, control); |
32bfd35d | 1063 | dev_put(dev); |
e2ebc74d JB |
1064 | return 0; |
1065 | } | |
1066 | ||
1067 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1068 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1069 | { |
5cf121c3 | 1070 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d JB |
1071 | int ret, i; |
1072 | ||
1073 | if (!ieee80211_qdisc_installed(local->mdev) && | |
1074 | __ieee80211_queue_stopped(local, 0)) { | |
1075 | netif_stop_queue(local->mdev); | |
1076 | return IEEE80211_TX_AGAIN; | |
1077 | } | |
1078 | if (skb) { | |
dd1cd4c6 JB |
1079 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
1080 | "TX to low-level driver", skb); | |
e2ebc74d JB |
1081 | ret = local->ops->tx(local_to_hw(local), skb, control); |
1082 | if (ret) | |
1083 | return IEEE80211_TX_AGAIN; | |
1084 | local->mdev->trans_start = jiffies; | |
1085 | ieee80211_led_tx(local, 1); | |
1086 | } | |
5cf121c3 | 1087 | if (tx->extra_frag) { |
e2ebc74d JB |
1088 | control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS | |
1089 | IEEE80211_TXCTL_USE_CTS_PROTECT | | |
d46e144b | 1090 | IEEE80211_TXCTL_CLEAR_PS_FILT | |
e2ebc74d | 1091 | IEEE80211_TXCTL_FIRST_FRAGMENT); |
5cf121c3 JB |
1092 | for (i = 0; i < tx->num_extra_frag; i++) { |
1093 | if (!tx->extra_frag[i]) | |
e2ebc74d JB |
1094 | continue; |
1095 | if (__ieee80211_queue_stopped(local, control->queue)) | |
1096 | return IEEE80211_TX_FRAG_AGAIN; | |
5cf121c3 JB |
1097 | if (i == tx->num_extra_frag) { |
1098 | control->tx_rate = tx->last_frag_rate; | |
8318d78a | 1099 | |
5cf121c3 | 1100 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e2ebc74d JB |
1101 | control->flags |= |
1102 | IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1103 | else | |
1104 | control->flags &= | |
1105 | ~IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1106 | } | |
1107 | ||
dd1cd4c6 | 1108 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
e2ebc74d | 1109 | "TX to low-level driver", |
5cf121c3 | 1110 | tx->extra_frag[i]); |
e2ebc74d | 1111 | ret = local->ops->tx(local_to_hw(local), |
5cf121c3 | 1112 | tx->extra_frag[i], |
e2ebc74d JB |
1113 | control); |
1114 | if (ret) | |
1115 | return IEEE80211_TX_FRAG_AGAIN; | |
1116 | local->mdev->trans_start = jiffies; | |
1117 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1118 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1119 | } |
5cf121c3 JB |
1120 | kfree(tx->extra_frag); |
1121 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1122 | } |
1123 | return IEEE80211_TX_OK; | |
1124 | } | |
1125 | ||
1126 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb, | |
f9d540ee | 1127 | struct ieee80211_tx_control *control) |
e2ebc74d JB |
1128 | { |
1129 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1130 | struct sta_info *sta; | |
1131 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1132 | struct ieee80211_tx_data tx; |
9ae54c84 | 1133 | ieee80211_tx_result res = TX_DROP, res_prepare; |
e2ebc74d JB |
1134 | int ret, i; |
1135 | ||
1136 | WARN_ON(__ieee80211_queue_pending(local, control->queue)); | |
1137 | ||
1138 | if (unlikely(skb->len < 10)) { | |
1139 | dev_kfree_skb(skb); | |
1140 | return 0; | |
1141 | } | |
1142 | ||
d0709a65 JB |
1143 | rcu_read_lock(); |
1144 | ||
58d4185e | 1145 | /* initialises tx */ |
e2ebc74d JB |
1146 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control); |
1147 | ||
9ae54c84 | 1148 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1149 | dev_kfree_skb(skb); |
d0709a65 | 1150 | rcu_read_unlock(); |
e2ebc74d JB |
1151 | return 0; |
1152 | } | |
1153 | ||
1154 | sta = tx.sta; | |
5cf121c3 | 1155 | tx.channel = local->hw.conf.channel; |
e2ebc74d | 1156 | |
58905290 | 1157 | for (handler = ieee80211_tx_handlers; *handler != NULL; |
58d4185e JB |
1158 | handler++) { |
1159 | res = (*handler)(&tx); | |
9ae54c84 | 1160 | if (res != TX_CONTINUE) |
58d4185e | 1161 | break; |
e2ebc74d JB |
1162 | } |
1163 | ||
1164 | skb = tx.skb; /* handlers are allowed to change skb */ | |
1165 | ||
9ae54c84 | 1166 | if (unlikely(res == TX_DROP)) { |
e2ebc74d JB |
1167 | I802_DEBUG_INC(local->tx_handlers_drop); |
1168 | goto drop; | |
1169 | } | |
1170 | ||
9ae54c84 | 1171 | if (unlikely(res == TX_QUEUED)) { |
e2ebc74d | 1172 | I802_DEBUG_INC(local->tx_handlers_queued); |
d4e46a3d | 1173 | rcu_read_unlock(); |
e2ebc74d JB |
1174 | return 0; |
1175 | } | |
1176 | ||
5cf121c3 JB |
1177 | if (tx.extra_frag) { |
1178 | for (i = 0; i < tx.num_extra_frag; i++) { | |
e2ebc74d JB |
1179 | int next_len, dur; |
1180 | struct ieee80211_hdr *hdr = | |
1181 | (struct ieee80211_hdr *) | |
5cf121c3 | 1182 | tx.extra_frag[i]->data; |
e2ebc74d | 1183 | |
5cf121c3 JB |
1184 | if (i + 1 < tx.num_extra_frag) { |
1185 | next_len = tx.extra_frag[i + 1]->len; | |
e2ebc74d JB |
1186 | } else { |
1187 | next_len = 0; | |
5cf121c3 | 1188 | tx.rate = tx.last_frag_rate; |
e2ebc74d JB |
1189 | } |
1190 | dur = ieee80211_duration(&tx, 0, next_len); | |
1191 | hdr->duration_id = cpu_to_le16(dur); | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | retry: | |
1196 | ret = __ieee80211_tx(local, skb, &tx); | |
1197 | if (ret) { | |
1198 | struct ieee80211_tx_stored_packet *store = | |
1199 | &local->pending_packet[control->queue]; | |
1200 | ||
1201 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1202 | skb = NULL; | |
1203 | set_bit(IEEE80211_LINK_STATE_PENDING, | |
1204 | &local->state[control->queue]); | |
1205 | smp_mb(); | |
1206 | /* When the driver gets out of buffers during sending of | |
1207 | * fragments and calls ieee80211_stop_queue, there is | |
1208 | * a small window between IEEE80211_LINK_STATE_XOFF and | |
1209 | * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer | |
1210 | * gets available in that window (i.e. driver calls | |
1211 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
1212 | * called with IEEE80211_LINK_STATE_PENDING. Prevent this by | |
1213 | * continuing transmitting here when that situation is | |
1214 | * possible to have happened. */ | |
1215 | if (!__ieee80211_queue_stopped(local, control->queue)) { | |
1216 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1217 | &local->state[control->queue]); | |
1218 | goto retry; | |
1219 | } | |
1220 | memcpy(&store->control, control, | |
1221 | sizeof(struct ieee80211_tx_control)); | |
1222 | store->skb = skb; | |
5cf121c3 JB |
1223 | store->extra_frag = tx.extra_frag; |
1224 | store->num_extra_frag = tx.num_extra_frag; | |
1225 | store->last_frag_rate = tx.last_frag_rate; | |
badffb72 | 1226 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1227 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1228 | } |
d4e46a3d | 1229 | rcu_read_unlock(); |
e2ebc74d JB |
1230 | return 0; |
1231 | ||
1232 | drop: | |
1233 | if (skb) | |
1234 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1235 | for (i = 0; i < tx.num_extra_frag; i++) |
1236 | if (tx.extra_frag[i]) | |
1237 | dev_kfree_skb(tx.extra_frag[i]); | |
1238 | kfree(tx.extra_frag); | |
d4e46a3d | 1239 | rcu_read_unlock(); |
e2ebc74d JB |
1240 | return 0; |
1241 | } | |
1242 | ||
1243 | /* device xmit handlers */ | |
1244 | ||
1245 | int ieee80211_master_start_xmit(struct sk_buff *skb, | |
1246 | struct net_device *dev) | |
1247 | { | |
1248 | struct ieee80211_tx_control control; | |
1249 | struct ieee80211_tx_packet_data *pkt_data; | |
1250 | struct net_device *odev = NULL; | |
1251 | struct ieee80211_sub_if_data *osdata; | |
1252 | int headroom; | |
1253 | int ret; | |
1254 | ||
1255 | /* | |
1256 | * copy control out of the skb so other people can use skb->cb | |
1257 | */ | |
1258 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1259 | memset(&control, 0, sizeof(struct ieee80211_tx_control)); | |
1260 | ||
1261 | if (pkt_data->ifindex) | |
881d966b | 1262 | odev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1263 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1264 | dev_put(odev); | |
1265 | odev = NULL; | |
1266 | } | |
1267 | if (unlikely(!odev)) { | |
1268 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1269 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1270 | "originating device\n", dev->name); | |
1271 | #endif | |
1272 | dev_kfree_skb(skb); | |
1273 | return 0; | |
1274 | } | |
1275 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); | |
1276 | ||
1277 | headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM; | |
1278 | if (skb_headroom(skb) < headroom) { | |
1279 | if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { | |
1280 | dev_kfree_skb(skb); | |
1281 | dev_put(odev); | |
1282 | return 0; | |
1283 | } | |
1284 | } | |
1285 | ||
32bfd35d | 1286 | control.vif = &osdata->vif; |
51fb61e7 | 1287 | control.type = osdata->vif.type; |
e8bf9649 | 1288 | if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS) |
e2ebc74d | 1289 | control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS; |
e8bf9649 | 1290 | if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT) |
e2ebc74d | 1291 | control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
e8bf9649 | 1292 | if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) |
e2ebc74d | 1293 | control.flags |= IEEE80211_TXCTL_REQUEUE; |
678f5f71 JB |
1294 | if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME) |
1295 | control.flags |= IEEE80211_TXCTL_EAPOL_FRAME; | |
9e723492 RR |
1296 | if (pkt_data->flags & IEEE80211_TXPD_AMPDU) |
1297 | control.flags |= IEEE80211_TXCTL_AMPDU; | |
e2ebc74d JB |
1298 | control.queue = pkt_data->queue; |
1299 | ||
f9d540ee | 1300 | ret = ieee80211_tx(odev, skb, &control); |
e2ebc74d JB |
1301 | dev_put(odev); |
1302 | ||
1303 | return ret; | |
1304 | } | |
1305 | ||
1306 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1307 | struct net_device *dev) | |
1308 | { | |
1309 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1310 | struct ieee80211_tx_packet_data *pkt_data; | |
1311 | struct ieee80211_radiotap_header *prthdr = | |
1312 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1313 | u16 len_rthdr; |
e2ebc74d | 1314 | |
9b8a74e3 AG |
1315 | /* check for not even having the fixed radiotap header part */ |
1316 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1317 | goto fail; /* too short to be possibly valid */ | |
1318 | ||
1319 | /* is it a header version we can trust to find length from? */ | |
1320 | if (unlikely(prthdr->it_version)) | |
1321 | goto fail; /* only version 0 is supported */ | |
1322 | ||
1323 | /* then there must be a radiotap header with a length we can use */ | |
1324 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1325 | ||
1326 | /* does the skb contain enough to deliver on the alleged length? */ | |
1327 | if (unlikely(skb->len < len_rthdr)) | |
1328 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1329 | |
1330 | skb->dev = local->mdev; | |
1331 | ||
1332 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1333 | memset(pkt_data, 0, sizeof(*pkt_data)); | |
9b8a74e3 | 1334 | /* needed because we set skb device to master */ |
e2ebc74d | 1335 | pkt_data->ifindex = dev->ifindex; |
9b8a74e3 | 1336 | |
e8bf9649 | 1337 | pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT; |
e2ebc74d | 1338 | |
e2ebc74d JB |
1339 | /* |
1340 | * fix up the pointers accounting for the radiotap | |
1341 | * header still being in there. We are being given | |
1342 | * a precooked IEEE80211 header so no need for | |
1343 | * normal processing | |
1344 | */ | |
9b8a74e3 | 1345 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1346 | /* |
9b8a74e3 AG |
1347 | * these are just fixed to the end of the rt area since we |
1348 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1349 | */ |
9b8a74e3 AG |
1350 | skb_set_network_header(skb, len_rthdr); |
1351 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1352 | |
9b8a74e3 AG |
1353 | /* pass the radiotap header up to the next stage intact */ |
1354 | dev_queue_xmit(skb); | |
e2ebc74d | 1355 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1356 | |
1357 | fail: | |
1358 | dev_kfree_skb(skb); | |
1359 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1360 | } |
1361 | ||
1362 | /** | |
1363 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1364 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1365 | * @skb: packet to be sent | |
1366 | * @dev: incoming interface | |
1367 | * | |
1368 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1369 | * not be freed, and caller is responsible for either retrying later or freeing | |
1370 | * skb). | |
1371 | * | |
1372 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1373 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1374 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1375 | * transmission (through low-level driver). | |
1376 | */ | |
1377 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1378 | struct net_device *dev) | |
1379 | { | |
1380 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1381 | struct ieee80211_tx_packet_data *pkt_data; | |
1382 | struct ieee80211_sub_if_data *sdata; | |
1383 | int ret = 1, head_need; | |
33b64eb2 | 1384 | u16 ethertype, hdrlen, meshhdrlen = 0, fc; |
e2ebc74d | 1385 | struct ieee80211_hdr hdr; |
33b64eb2 | 1386 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1387 | const u8 *encaps_data; |
1388 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1389 | int nh_pos, h_pos; |
e2ebc74d | 1390 | struct sta_info *sta; |
ce3edf6d | 1391 | u32 sta_flags = 0; |
e2ebc74d JB |
1392 | |
1393 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1394 | if (unlikely(skb->len < ETH_HLEN)) { | |
1395 | printk(KERN_DEBUG "%s: short skb (len=%d)\n", | |
1396 | dev->name, skb->len); | |
1397 | ret = 0; | |
1398 | goto fail; | |
1399 | } | |
1400 | ||
1401 | nh_pos = skb_network_header(skb) - skb->data; | |
1402 | h_pos = skb_transport_header(skb) - skb->data; | |
1403 | ||
1404 | /* convert Ethernet header to proper 802.11 header (based on | |
1405 | * operation mode) */ | |
1406 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
e2ebc74d JB |
1407 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; |
1408 | ||
51fb61e7 | 1409 | switch (sdata->vif.type) { |
cf966838 JB |
1410 | case IEEE80211_IF_TYPE_AP: |
1411 | case IEEE80211_IF_TYPE_VLAN: | |
e2ebc74d JB |
1412 | fc |= IEEE80211_FCTL_FROMDS; |
1413 | /* DA BSSID SA */ | |
1414 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1415 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1416 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1417 | hdrlen = 24; | |
cf966838 JB |
1418 | break; |
1419 | case IEEE80211_IF_TYPE_WDS: | |
e2ebc74d JB |
1420 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; |
1421 | /* RA TA DA SA */ | |
1422 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1423 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1424 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1425 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1426 | hdrlen = 30; | |
cf966838 | 1427 | break; |
33b64eb2 LCC |
1428 | #ifdef CONFIG_MAC80211_MESH |
1429 | case IEEE80211_IF_TYPE_MESH_POINT: | |
1430 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; | |
1431 | /* RA TA DA SA */ | |
1432 | if (is_multicast_ether_addr(skb->data)) | |
1433 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1434 | else if (mesh_nexthop_lookup(hdr.addr1, skb, dev)) | |
1435 | return 0; | |
1436 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1437 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1438 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1439 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
1440 | /* Forwarded frame, keep mesh ttl and seqnum */ | |
1441 | struct ieee80211s_hdr *prev_meshhdr; | |
1442 | prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb); | |
1443 | meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr); | |
1444 | memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen); | |
1445 | sdata->u.sta.mshstats.fwded_frames++; | |
1446 | } else { | |
1447 | if (!sdata->u.sta.mshcfg.dot11MeshTTL) { | |
1448 | /* Do not send frames with mesh_ttl == 0 */ | |
1449 | sdata->u.sta.mshstats.dropped_frames_ttl++; | |
1450 | ret = 0; | |
1451 | goto fail; | |
1452 | } | |
1453 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
902acc78 | 1454 | sdata); |
33b64eb2 LCC |
1455 | } |
1456 | hdrlen = 30; | |
1457 | break; | |
1458 | #endif | |
cf966838 | 1459 | case IEEE80211_IF_TYPE_STA: |
e2ebc74d JB |
1460 | fc |= IEEE80211_FCTL_TODS; |
1461 | /* BSSID SA DA */ | |
1462 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1463 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1464 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1465 | hdrlen = 24; | |
cf966838 JB |
1466 | break; |
1467 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1468 | /* DA SA BSSID */ |
1469 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1470 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1471 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1472 | hdrlen = 24; | |
cf966838 JB |
1473 | break; |
1474 | default: | |
e2ebc74d JB |
1475 | ret = 0; |
1476 | goto fail; | |
1477 | } | |
1478 | ||
7d185b8b JB |
1479 | /* |
1480 | * There's no need to try to look up the destination | |
1481 | * if it is a multicast address (which can only happen | |
1482 | * in AP mode) | |
1483 | */ | |
1484 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1485 | rcu_read_lock(); |
7d185b8b | 1486 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1487 | if (sta) |
7d185b8b | 1488 | sta_flags = sta->flags; |
d0709a65 | 1489 | rcu_read_unlock(); |
e2ebc74d JB |
1490 | } |
1491 | ||
ce3edf6d JB |
1492 | /* receiver is QoS enabled, use a QoS type frame */ |
1493 | if (sta_flags & WLAN_STA_WME) { | |
1494 | fc |= IEEE80211_STYPE_QOS_DATA; | |
1495 | hdrlen += 2; | |
1496 | } | |
1497 | ||
1498 | /* | |
238814fd JB |
1499 | * Drop unicast frames to unauthorised stations unless they are |
1500 | * EAPOL frames from the local station. | |
ce3edf6d | 1501 | */ |
238814fd | 1502 | if (unlikely(!is_multicast_ether_addr(hdr.addr1) && |
33b64eb2 LCC |
1503 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1504 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1505 | compare_ether_addr(dev->dev_addr, |
1506 | skb->data + ETH_ALEN) == 0))) { | |
1507 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1508 | DECLARE_MAC_BUF(mac); | |
1509 | ||
1510 | if (net_ratelimit()) | |
1511 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1512 | " (unauthorized port)\n", dev->name, | |
1513 | print_mac(mac, hdr.addr1)); | |
1514 | #endif | |
1515 | ||
1516 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1517 | ||
1518 | ret = 0; | |
1519 | goto fail; | |
1520 | } | |
1521 | ||
e2ebc74d JB |
1522 | hdr.frame_control = cpu_to_le16(fc); |
1523 | hdr.duration_id = 0; | |
1524 | hdr.seq_ctrl = 0; | |
1525 | ||
1526 | skip_header_bytes = ETH_HLEN; | |
1527 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1528 | encaps_data = bridge_tunnel_header; | |
1529 | encaps_len = sizeof(bridge_tunnel_header); | |
1530 | skip_header_bytes -= 2; | |
1531 | } else if (ethertype >= 0x600) { | |
1532 | encaps_data = rfc1042_header; | |
1533 | encaps_len = sizeof(rfc1042_header); | |
1534 | skip_header_bytes -= 2; | |
1535 | } else { | |
1536 | encaps_data = NULL; | |
1537 | encaps_len = 0; | |
1538 | } | |
1539 | ||
1540 | skb_pull(skb, skip_header_bytes); | |
1541 | nh_pos -= skip_header_bytes; | |
1542 | h_pos -= skip_header_bytes; | |
1543 | ||
1544 | /* TODO: implement support for fragments so that there is no need to | |
1545 | * reallocate and copy payload; it might be enough to support one | |
1546 | * extra fragment that would be copied in the beginning of the frame | |
1547 | * data.. anyway, it would be nice to include this into skb structure | |
1548 | * somehow | |
1549 | * | |
1550 | * There are few options for this: | |
1551 | * use skb->cb as an extra space for 802.11 header | |
1552 | * allocate new buffer if not enough headroom | |
1553 | * make sure that there is enough headroom in every skb by increasing | |
1554 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1555 | * alloc_skb() (net/core/skbuff.c) | |
1556 | */ | |
33b64eb2 | 1557 | head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom; |
e2ebc74d JB |
1558 | head_need -= skb_headroom(skb); |
1559 | ||
1560 | /* We are going to modify skb data, so make a copy of it if happens to | |
1561 | * be cloned. This could happen, e.g., with Linux bridge code passing | |
1562 | * us broadcast frames. */ | |
1563 | ||
1564 | if (head_need > 0 || skb_cloned(skb)) { | |
1565 | #if 0 | |
1566 | printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " | |
1567 | "of headroom\n", dev->name, head_need); | |
1568 | #endif | |
1569 | ||
1570 | if (skb_cloned(skb)) | |
1571 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1572 | else | |
1573 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1574 | /* Since we have to reallocate the buffer, make sure that there | |
1575 | * is enough room for possible WEP IV/ICV and TKIP (8 bytes | |
1576 | * before payload and 12 after). */ | |
1577 | if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8), | |
1578 | 12, GFP_ATOMIC)) { | |
1579 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer" | |
1580 | "\n", dev->name); | |
1581 | goto fail; | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | if (encaps_data) { | |
1586 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1587 | nh_pos += encaps_len; | |
1588 | h_pos += encaps_len; | |
1589 | } | |
c29b9b9b | 1590 | |
33b64eb2 LCC |
1591 | if (meshhdrlen > 0) { |
1592 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1593 | nh_pos += meshhdrlen; | |
1594 | h_pos += meshhdrlen; | |
1595 | } | |
1596 | ||
c29b9b9b JB |
1597 | if (fc & IEEE80211_STYPE_QOS_DATA) { |
1598 | __le16 *qos_control; | |
1599 | ||
1600 | qos_control = (__le16*) skb_push(skb, 2); | |
1601 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1602 | /* | |
1603 | * Maybe we could actually set some fields here, for now just | |
1604 | * initialise to zero to indicate no special operation. | |
1605 | */ | |
1606 | *qos_control = 0; | |
1607 | } else | |
1608 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1609 | ||
e2ebc74d JB |
1610 | nh_pos += hdrlen; |
1611 | h_pos += hdrlen; | |
1612 | ||
1613 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1614 | memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); | |
1615 | pkt_data->ifindex = dev->ifindex; | |
678f5f71 JB |
1616 | if (ethertype == ETH_P_PAE) |
1617 | pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME; | |
e2ebc74d JB |
1618 | |
1619 | skb->dev = local->mdev; | |
68aae116 SH |
1620 | dev->stats.tx_packets++; |
1621 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1622 | |
1623 | /* Update skb pointers to various headers since this modified frame | |
1624 | * is going to go through Linux networking code that may potentially | |
1625 | * need things like pointer to IP header. */ | |
1626 | skb_set_mac_header(skb, 0); | |
1627 | skb_set_network_header(skb, nh_pos); | |
1628 | skb_set_transport_header(skb, h_pos); | |
1629 | ||
1630 | dev->trans_start = jiffies; | |
1631 | dev_queue_xmit(skb); | |
1632 | ||
1633 | return 0; | |
1634 | ||
1635 | fail: | |
1636 | if (!ret) | |
1637 | dev_kfree_skb(skb); | |
1638 | ||
1639 | return ret; | |
1640 | } | |
1641 | ||
e2ebc74d JB |
1642 | /* helper functions for pending packets for when queues are stopped */ |
1643 | ||
1644 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) | |
1645 | { | |
1646 | int i, j; | |
1647 | struct ieee80211_tx_stored_packet *store; | |
1648 | ||
1649 | for (i = 0; i < local->hw.queues; i++) { | |
1650 | if (!__ieee80211_queue_pending(local, i)) | |
1651 | continue; | |
1652 | store = &local->pending_packet[i]; | |
1653 | kfree_skb(store->skb); | |
1654 | for (j = 0; j < store->num_extra_frag; j++) | |
1655 | kfree_skb(store->extra_frag[j]); | |
1656 | kfree(store->extra_frag); | |
1657 | clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]); | |
1658 | } | |
1659 | } | |
1660 | ||
1661 | void ieee80211_tx_pending(unsigned long data) | |
1662 | { | |
1663 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1664 | struct net_device *dev = local->mdev; | |
1665 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1666 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
1667 | int i, ret, reschedule = 0; |
1668 | ||
1669 | netif_tx_lock_bh(dev); | |
1670 | for (i = 0; i < local->hw.queues; i++) { | |
1671 | if (__ieee80211_queue_stopped(local, i)) | |
1672 | continue; | |
1673 | if (!__ieee80211_queue_pending(local, i)) { | |
1674 | reschedule = 1; | |
1675 | continue; | |
1676 | } | |
1677 | store = &local->pending_packet[i]; | |
5cf121c3 JB |
1678 | tx.control = &store->control; |
1679 | tx.extra_frag = store->extra_frag; | |
1680 | tx.num_extra_frag = store->num_extra_frag; | |
1681 | tx.last_frag_rate = store->last_frag_rate; | |
badffb72 JS |
1682 | tx.flags = 0; |
1683 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1684 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1685 | ret = __ieee80211_tx(local, store->skb, &tx); |
1686 | if (ret) { | |
1687 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1688 | store->skb = NULL; | |
1689 | } else { | |
1690 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1691 | &local->state[i]); | |
1692 | reschedule = 1; | |
1693 | } | |
1694 | } | |
1695 | netif_tx_unlock_bh(dev); | |
1696 | if (reschedule) { | |
1697 | if (!ieee80211_qdisc_installed(dev)) { | |
1698 | if (!__ieee80211_queue_stopped(local, 0)) | |
1699 | netif_wake_queue(dev); | |
1700 | } else | |
1701 | netif_schedule(dev); | |
1702 | } | |
1703 | } | |
1704 | ||
1705 | /* functions for drivers to get certain frames */ | |
1706 | ||
1707 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1708 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1709 | struct sk_buff *skb, |
1710 | struct beacon_data *beacon) | |
e2ebc74d JB |
1711 | { |
1712 | u8 *pos, *tim; | |
1713 | int aid0 = 0; | |
1714 | int i, have_bits = 0, n1, n2; | |
1715 | ||
1716 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1717 | * mode. */ | |
e2ebc74d JB |
1718 | if (atomic_read(&bss->num_sta_ps) > 0) |
1719 | /* in the hope that this is faster than | |
1720 | * checking byte-for-byte */ | |
1721 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1722 | IEEE80211_MAX_AID+1); | |
1723 | ||
1724 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1725 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1726 | else |
1727 | bss->dtim_count--; | |
1728 | ||
1729 | tim = pos = (u8 *) skb_put(skb, 6); | |
1730 | *pos++ = WLAN_EID_TIM; | |
1731 | *pos++ = 4; | |
1732 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1733 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1734 | |
1735 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1736 | aid0 = 1; | |
1737 | ||
1738 | if (have_bits) { | |
1739 | /* Find largest even number N1 so that bits numbered 1 through | |
1740 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1741 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1742 | n1 = 0; | |
1743 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1744 | if (bss->tim[i]) { | |
1745 | n1 = i & 0xfe; | |
1746 | break; | |
1747 | } | |
1748 | } | |
1749 | n2 = n1; | |
1750 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1751 | if (bss->tim[i]) { | |
1752 | n2 = i; | |
1753 | break; | |
1754 | } | |
1755 | } | |
1756 | ||
1757 | /* Bitmap control */ | |
1758 | *pos++ = n1 | aid0; | |
1759 | /* Part Virt Bitmap */ | |
1760 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1761 | ||
1762 | tim[1] = n2 - n1 + 4; | |
1763 | skb_put(skb, n2 - n1); | |
1764 | } else { | |
1765 | *pos++ = aid0; /* Bitmap control */ | |
1766 | *pos++ = 0; /* Part Virt Bitmap */ | |
1767 | } | |
e2ebc74d JB |
1768 | } |
1769 | ||
32bfd35d JB |
1770 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
1771 | struct ieee80211_vif *vif, | |
e2ebc74d JB |
1772 | struct ieee80211_tx_control *control) |
1773 | { | |
1774 | struct ieee80211_local *local = hw_to_local(hw); | |
1775 | struct sk_buff *skb; | |
1776 | struct net_device *bdev; | |
1777 | struct ieee80211_sub_if_data *sdata = NULL; | |
1778 | struct ieee80211_if_ap *ap = NULL; | |
1abbe498 | 1779 | struct rate_selection rsel; |
5dfdaf58 | 1780 | struct beacon_data *beacon; |
8318d78a | 1781 | struct ieee80211_supported_band *sband; |
902acc78 | 1782 | struct ieee80211_mgmt *mgmt; |
33b64eb2 | 1783 | int *num_beacons; |
902acc78 JB |
1784 | bool err = true; |
1785 | u8 *pos; | |
8318d78a JB |
1786 | |
1787 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
5dfdaf58 JB |
1788 | |
1789 | rcu_read_lock(); | |
e2ebc74d | 1790 | |
32bfd35d JB |
1791 | sdata = vif_to_sdata(vif); |
1792 | bdev = sdata->dev; | |
e2ebc74d | 1793 | |
902acc78 | 1794 | if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
33b64eb2 LCC |
1795 | ap = &sdata->u.ap; |
1796 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1797 | if (ap && beacon) { |
1798 | /* | |
1799 | * headroom, head length, | |
1800 | * tail length and maximum TIM length | |
1801 | */ | |
1802 | skb = dev_alloc_skb(local->tx_headroom + | |
1803 | beacon->head_len + | |
1804 | beacon->tail_len + 256); | |
1805 | if (!skb) | |
1806 | goto out; | |
33b64eb2 | 1807 | |
902acc78 JB |
1808 | skb_reserve(skb, local->tx_headroom); |
1809 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1810 | beacon->head_len); | |
33b64eb2 | 1811 | |
902acc78 JB |
1812 | ieee80211_include_sequence(sdata, |
1813 | (struct ieee80211_hdr *)skb->data); | |
33b64eb2 | 1814 | |
d0709a65 JB |
1815 | /* |
1816 | * Not very nice, but we want to allow the driver to call | |
1817 | * ieee80211_beacon_get() as a response to the set_tim() | |
1818 | * callback. That, however, is already invoked under the | |
1819 | * sta_lock to guarantee consistent and race-free update | |
1820 | * of the tim bitmap in mac80211 and the driver. | |
1821 | */ | |
1822 | if (local->tim_in_locked_section) { | |
1823 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1824 | } else { | |
1825 | unsigned long flags; | |
1826 | ||
1827 | spin_lock_irqsave(&local->sta_lock, flags); | |
1828 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1829 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1830 | } | |
33b64eb2 | 1831 | |
902acc78 JB |
1832 | if (beacon->tail) |
1833 | memcpy(skb_put(skb, beacon->tail_len), | |
1834 | beacon->tail, beacon->tail_len); | |
33b64eb2 | 1835 | |
902acc78 | 1836 | num_beacons = &ap->num_beacons; |
33b64eb2 | 1837 | |
902acc78 JB |
1838 | err = false; |
1839 | } | |
1840 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
1841 | /* headroom, head length, tail length and maximum TIM length */ | |
1842 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1843 | if (!skb) | |
1844 | goto out; | |
1845 | ||
1846 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1847 | mgmt = (struct ieee80211_mgmt *) | |
1848 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1849 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
1850 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
1851 | IEEE80211_STYPE_BEACON); | |
1852 | memset(mgmt->da, 0xff, ETH_ALEN); | |
1853 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1854 | /* BSSID is left zeroed, wildcard value */ | |
1855 | mgmt->u.beacon.beacon_int = | |
1856 | cpu_to_le16(local->hw.conf.beacon_int); | |
1857 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1858 | ||
1859 | pos = skb_put(skb, 2); | |
1860 | *pos++ = WLAN_EID_SSID; | |
1861 | *pos++ = 0x0; | |
1862 | ||
1863 | mesh_mgmt_ies_add(skb, sdata->dev); | |
33b64eb2 | 1864 | |
33b64eb2 | 1865 | num_beacons = &sdata->u.sta.num_beacons; |
33b64eb2 | 1866 | |
902acc78 | 1867 | err = false; |
33b64eb2 | 1868 | } |
5dfdaf58 | 1869 | |
33b64eb2 | 1870 | if (err) { |
e2ebc74d JB |
1871 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1872 | if (net_ratelimit()) | |
32bfd35d JB |
1873 | printk(KERN_DEBUG "no beacon data avail for %s\n", |
1874 | bdev->name); | |
e2ebc74d | 1875 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
5dfdaf58 JB |
1876 | skb = NULL; |
1877 | goto out; | |
e2ebc74d JB |
1878 | } |
1879 | ||
e2ebc74d | 1880 | if (control) { |
8318d78a | 1881 | rate_control_get_rate(local->mdev, sband, skb, &rsel); |
1abbe498 | 1882 | if (!rsel.rate) { |
e2ebc74d | 1883 | if (net_ratelimit()) { |
1abbe498 MN |
1884 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " |
1885 | "no rate found\n", | |
1886 | wiphy_name(local->hw.wiphy)); | |
e2ebc74d JB |
1887 | } |
1888 | dev_kfree_skb(skb); | |
5dfdaf58 JB |
1889 | skb = NULL; |
1890 | goto out; | |
e2ebc74d JB |
1891 | } |
1892 | ||
0f7054e3 | 1893 | control->vif = vif; |
8318d78a JB |
1894 | control->tx_rate = rsel.rate; |
1895 | if (sdata->bss_conf.use_short_preamble && | |
1896 | rsel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1897 | control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE; | |
e2ebc74d | 1898 | control->antenna_sel_tx = local->hw.conf.antenna_sel_tx; |
e2ebc74d JB |
1899 | control->flags |= IEEE80211_TXCTL_NO_ACK; |
1900 | control->retry_limit = 1; | |
d46e144b | 1901 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; |
e2ebc74d | 1902 | } |
33b64eb2 LCC |
1903 | (*num_beacons)++; |
1904 | out: | |
5dfdaf58 | 1905 | rcu_read_unlock(); |
e2ebc74d JB |
1906 | return skb; |
1907 | } | |
1908 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1909 | ||
32bfd35d | 1910 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d JB |
1911 | const void *frame, size_t frame_len, |
1912 | const struct ieee80211_tx_control *frame_txctl, | |
1913 | struct ieee80211_rts *rts) | |
1914 | { | |
1915 | const struct ieee80211_hdr *hdr = frame; | |
1916 | u16 fctl; | |
1917 | ||
1918 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS; | |
1919 | rts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1920 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1921 | frame_txctl); | |
e2ebc74d JB |
1922 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1923 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1924 | } | |
1925 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1926 | ||
32bfd35d | 1927 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d JB |
1928 | const void *frame, size_t frame_len, |
1929 | const struct ieee80211_tx_control *frame_txctl, | |
1930 | struct ieee80211_cts *cts) | |
1931 | { | |
1932 | const struct ieee80211_hdr *hdr = frame; | |
1933 | u16 fctl; | |
1934 | ||
1935 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS; | |
1936 | cts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1937 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1938 | frame_len, frame_txctl); | |
e2ebc74d JB |
1939 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1940 | } | |
1941 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1942 | ||
1943 | struct sk_buff * | |
32bfd35d JB |
1944 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
1945 | struct ieee80211_vif *vif, | |
e2ebc74d JB |
1946 | struct ieee80211_tx_control *control) |
1947 | { | |
1948 | struct ieee80211_local *local = hw_to_local(hw); | |
1949 | struct sk_buff *skb; | |
1950 | struct sta_info *sta; | |
1951 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1952 | struct ieee80211_tx_data tx; |
9ae54c84 | 1953 | ieee80211_tx_result res = TX_DROP; |
e2ebc74d JB |
1954 | struct net_device *bdev; |
1955 | struct ieee80211_sub_if_data *sdata; | |
1956 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 1957 | struct beacon_data *beacon; |
e2ebc74d | 1958 | |
32bfd35d JB |
1959 | sdata = vif_to_sdata(vif); |
1960 | bdev = sdata->dev; | |
1961 | ||
5dfdaf58 JB |
1962 | |
1963 | if (!bss) | |
e2ebc74d JB |
1964 | return NULL; |
1965 | ||
5dfdaf58 JB |
1966 | rcu_read_lock(); |
1967 | beacon = rcu_dereference(bss->beacon); | |
1968 | ||
1969 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || | |
1970 | !beacon->head) { | |
1971 | rcu_read_unlock(); | |
1972 | return NULL; | |
1973 | } | |
5dfdaf58 | 1974 | |
e2ebc74d JB |
1975 | if (bss->dtim_count != 0) |
1976 | return NULL; /* send buffered bc/mc only after DTIM beacon */ | |
1977 | memset(control, 0, sizeof(*control)); | |
1978 | while (1) { | |
1979 | skb = skb_dequeue(&bss->ps_bc_buf); | |
1980 | if (!skb) | |
1981 | return NULL; | |
1982 | local->total_ps_buffered--; | |
1983 | ||
1984 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
1985 | struct ieee80211_hdr *hdr = | |
1986 | (struct ieee80211_hdr *) skb->data; | |
1987 | /* more buffered multicast/broadcast frames ==> set | |
1988 | * MoreData flag in IEEE 802.11 header to inform PS | |
1989 | * STAs */ | |
1990 | hdr->frame_control |= | |
1991 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
1992 | } | |
1993 | ||
58d4185e | 1994 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control)) |
e2ebc74d JB |
1995 | break; |
1996 | dev_kfree_skb_any(skb); | |
1997 | } | |
1998 | sta = tx.sta; | |
5cf121c3 JB |
1999 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2000 | tx.channel = local->hw.conf.channel; | |
e2ebc74d | 2001 | |
58905290 | 2002 | for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) { |
e2ebc74d | 2003 | res = (*handler)(&tx); |
9ae54c84 | 2004 | if (res == TX_DROP || res == TX_QUEUED) |
e2ebc74d JB |
2005 | break; |
2006 | } | |
e2ebc74d JB |
2007 | skb = tx.skb; /* handlers are allowed to change skb */ |
2008 | ||
9ae54c84 | 2009 | if (res == TX_DROP) { |
e2ebc74d JB |
2010 | I802_DEBUG_INC(local->tx_handlers_drop); |
2011 | dev_kfree_skb(skb); | |
2012 | skb = NULL; | |
9ae54c84 | 2013 | } else if (res == TX_QUEUED) { |
e2ebc74d JB |
2014 | I802_DEBUG_INC(local->tx_handlers_queued); |
2015 | skb = NULL; | |
2016 | } | |
2017 | ||
d0709a65 | 2018 | rcu_read_unlock(); |
e2ebc74d JB |
2019 | |
2020 | return skb; | |
2021 | } | |
2022 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |