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" | |
2c8dccc7 | 28 | #include "led.h" |
33b64eb2 | 29 | #include "mesh.h" |
e2ebc74d JB |
30 | #include "wep.h" |
31 | #include "wpa.h" | |
32 | #include "wme.h" | |
2c8dccc7 | 33 | #include "rate.h" |
e2ebc74d JB |
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; | |
2e92e6f2 | 94 | struct ieee80211_rate *txrate; |
e2ebc74d | 95 | struct ieee80211_local *local = tx->local; |
8318d78a | 96 | struct ieee80211_supported_band *sband; |
e2ebc74d | 97 | |
2e92e6f2 JB |
98 | sband = local->hw.wiphy->bands[tx->channel->band]; |
99 | txrate = &sband->bitrates[tx->rate_idx]; | |
8318d78a JB |
100 | |
101 | erp = 0; | |
102 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
103 | erp = txrate->flags & IEEE80211_RATE_ERP_G; | |
e2ebc74d JB |
104 | |
105 | /* | |
106 | * data and mgmt (except PS Poll): | |
107 | * - during CFP: 32768 | |
108 | * - during contention period: | |
109 | * if addr1 is group address: 0 | |
110 | * if more fragments = 0 and addr1 is individual address: time to | |
111 | * transmit one ACK plus SIFS | |
112 | * if more fragments = 1 and addr1 is individual address: time to | |
113 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
114 | * | |
115 | * IEEE 802.11, 9.6: | |
116 | * - control response frame (CTS or ACK) shall be transmitted using the | |
117 | * same rate as the immediately previous frame in the frame exchange | |
118 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
119 | * at the highest possible rate belonging to the PHY rates in the | |
120 | * BSSBasicRateSet | |
121 | */ | |
122 | ||
123 | if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) { | |
124 | /* TODO: These control frames are not currently sent by | |
125 | * 80211.o, but should they be implemented, this function | |
126 | * needs to be updated to support duration field calculation. | |
127 | * | |
128 | * RTS: time needed to transmit pending data/mgmt frame plus | |
129 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
130 | * CTS: duration of immediately previous RTS minus time | |
131 | * required to transmit CTS and its SIFS | |
132 | * ACK: 0 if immediately previous directed data/mgmt had | |
133 | * more=0, with more=1 duration in ACK frame is duration | |
134 | * from previous frame minus time needed to transmit ACK | |
135 | * and its SIFS | |
136 | * PS Poll: BIT(15) | BIT(14) | aid | |
137 | */ | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* data/mgmt */ | |
142 | if (0 /* FIX: data/mgmt during CFP */) | |
143 | return 32768; | |
144 | ||
145 | if (group_addr) /* Group address as the destination - no ACK */ | |
146 | return 0; | |
147 | ||
148 | /* Individual destination address: | |
149 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
150 | * CTS and ACK frames shall be transmitted using the highest rate in | |
151 | * basic rate set that is less than or equal to the rate of the | |
152 | * immediately previous frame and that is using the same modulation | |
153 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
154 | * the highest mandatory rate of the PHY that is less than or equal to | |
155 | * the rate of the previous frame is used. | |
156 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
157 | */ | |
158 | rate = -1; | |
8318d78a JB |
159 | /* use lowest available if everything fails */ |
160 | mrate = sband->bitrates[0].bitrate; | |
161 | for (i = 0; i < sband->n_bitrates; i++) { | |
162 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 163 | |
8318d78a JB |
164 | if (r->bitrate > txrate->bitrate) |
165 | break; | |
e2ebc74d | 166 | |
8318d78a JB |
167 | if (tx->sdata->basic_rates & BIT(i)) |
168 | rate = r->bitrate; | |
169 | ||
170 | switch (sband->band) { | |
171 | case IEEE80211_BAND_2GHZ: { | |
172 | u32 flag; | |
173 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
174 | flag = IEEE80211_RATE_MANDATORY_G; | |
175 | else | |
176 | flag = IEEE80211_RATE_MANDATORY_B; | |
177 | if (r->flags & flag) | |
178 | mrate = r->bitrate; | |
179 | break; | |
180 | } | |
181 | case IEEE80211_BAND_5GHZ: | |
182 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
183 | mrate = r->bitrate; | |
184 | break; | |
185 | case IEEE80211_NUM_BANDS: | |
186 | WARN_ON(1); | |
187 | break; | |
188 | } | |
e2ebc74d JB |
189 | } |
190 | if (rate == -1) { | |
191 | /* No matching basic rate found; use highest suitable mandatory | |
192 | * PHY rate */ | |
193 | rate = mrate; | |
194 | } | |
195 | ||
196 | /* Time needed to transmit ACK | |
197 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
198 | * to closest integer */ | |
199 | ||
200 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
471b3efd | 201 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
202 | |
203 | if (next_frag_len) { | |
204 | /* Frame is fragmented: duration increases with time needed to | |
205 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
206 | dur *= 2; /* ACK + SIFS */ | |
207 | /* next fragment */ | |
208 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 209 | txrate->bitrate, erp, |
471b3efd | 210 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
211 | } |
212 | ||
213 | return dur; | |
214 | } | |
215 | ||
216 | static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local, | |
217 | int queue) | |
218 | { | |
219 | return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]); | |
220 | } | |
221 | ||
222 | static inline int __ieee80211_queue_pending(const struct ieee80211_local *local, | |
223 | int queue) | |
224 | { | |
225 | return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]); | |
226 | } | |
227 | ||
228 | static int inline is_ieee80211_device(struct net_device *dev, | |
229 | struct net_device *master) | |
230 | { | |
231 | return (wdev_priv(dev->ieee80211_ptr) == | |
232 | wdev_priv(master->ieee80211_ptr)); | |
233 | } | |
234 | ||
235 | /* tx handlers */ | |
236 | ||
9ae54c84 | 237 | static ieee80211_tx_result |
5cf121c3 | 238 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
239 | { |
240 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
e039fa4a | 241 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2ebc74d | 242 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
e039fa4a | 243 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
244 | u32 sta_flags; |
245 | ||
e039fa4a | 246 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 247 | return TX_CONTINUE; |
58d4185e | 248 | |
ece8eddd | 249 | if (unlikely(tx->local->sta_sw_scanning) && |
e2ebc74d JB |
250 | ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || |
251 | (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ)) | |
9ae54c84 | 252 | return TX_DROP; |
e2ebc74d | 253 | |
33b64eb2 LCC |
254 | if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) |
255 | return TX_CONTINUE; | |
256 | ||
5cf121c3 | 257 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 258 | return TX_CONTINUE; |
e2ebc74d | 259 | |
07346f81 | 260 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 261 | |
5cf121c3 | 262 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 263 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
51fb61e7 | 264 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
e2ebc74d JB |
265 | (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) { |
266 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0795af57 | 267 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 268 | printk(KERN_DEBUG "%s: dropped data frame to not " |
0795af57 JP |
269 | "associated station %s\n", |
270 | tx->dev->name, print_mac(mac, hdr->addr1)); | |
e2ebc74d JB |
271 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
272 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 273 | return TX_DROP; |
e2ebc74d JB |
274 | } |
275 | } else { | |
276 | if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
277 | tx->local->num_sta == 0 && | |
51fb61e7 | 278 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) { |
e2ebc74d JB |
279 | /* |
280 | * No associated STAs - no need to send multicast | |
281 | * frames. | |
282 | */ | |
9ae54c84 | 283 | return TX_DROP; |
e2ebc74d | 284 | } |
9ae54c84 | 285 | return TX_CONTINUE; |
e2ebc74d JB |
286 | } |
287 | ||
9ae54c84 | 288 | return TX_CONTINUE; |
e2ebc74d JB |
289 | } |
290 | ||
9ae54c84 | 291 | static ieee80211_tx_result |
5cf121c3 | 292 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
293 | { |
294 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
295 | ||
296 | if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24) | |
297 | ieee80211_include_sequence(tx->sdata, hdr); | |
298 | ||
9ae54c84 | 299 | return TX_CONTINUE; |
e2ebc74d JB |
300 | } |
301 | ||
302 | /* This function is called whenever the AP is about to exceed the maximum limit | |
303 | * of buffered frames for power saving STAs. This situation should not really | |
304 | * happen often during normal operation, so dropping the oldest buffered packet | |
305 | * from each queue should be OK to make some room for new frames. */ | |
306 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
307 | { | |
308 | int total = 0, purged = 0; | |
309 | struct sk_buff *skb; | |
310 | struct ieee80211_sub_if_data *sdata; | |
311 | struct sta_info *sta; | |
312 | ||
79010420 JB |
313 | /* |
314 | * virtual interfaces are protected by RCU | |
315 | */ | |
316 | rcu_read_lock(); | |
317 | ||
318 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d JB |
319 | struct ieee80211_if_ap *ap; |
320 | if (sdata->dev == local->mdev || | |
51fb61e7 | 321 | sdata->vif.type != IEEE80211_IF_TYPE_AP) |
e2ebc74d JB |
322 | continue; |
323 | ap = &sdata->u.ap; | |
324 | skb = skb_dequeue(&ap->ps_bc_buf); | |
325 | if (skb) { | |
326 | purged++; | |
327 | dev_kfree_skb(skb); | |
328 | } | |
329 | total += skb_queue_len(&ap->ps_bc_buf); | |
330 | } | |
e2ebc74d | 331 | |
d0709a65 | 332 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
333 | skb = skb_dequeue(&sta->ps_tx_buf); |
334 | if (skb) { | |
335 | purged++; | |
336 | dev_kfree_skb(skb); | |
337 | } | |
338 | total += skb_queue_len(&sta->ps_tx_buf); | |
339 | } | |
d0709a65 JB |
340 | |
341 | rcu_read_unlock(); | |
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 | { |
e039fa4a JB |
351 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
352 | ||
7d54d0dd JB |
353 | /* |
354 | * broadcast/multicast frame | |
355 | * | |
356 | * If any of the associated stations is in power save mode, | |
357 | * the frame is buffered to be sent after DTIM beacon frame. | |
358 | * This is done either by the hardware or us. | |
359 | */ | |
360 | ||
361 | /* not AP/IBSS or ordered frame */ | |
362 | if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER)) | |
9ae54c84 | 363 | return TX_CONTINUE; |
7d54d0dd JB |
364 | |
365 | /* no stations in PS mode */ | |
366 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 367 | return TX_CONTINUE; |
7d54d0dd JB |
368 | |
369 | /* buffered in mac80211 */ | |
370 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
371 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
372 | purge_old_ps_buffers(tx->local); | |
373 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
374 | AP_MAX_BC_BUFFER) { | |
375 | if (net_ratelimit()) { | |
376 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
377 | "dropping the oldest frame\n", | |
378 | tx->dev->name); | |
379 | } | |
380 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); | |
381 | } else | |
382 | tx->local->total_ps_buffered++; | |
383 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 384 | return TX_QUEUED; |
e2ebc74d JB |
385 | } |
386 | ||
7d54d0dd | 387 | /* buffered in hardware */ |
e039fa4a | 388 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 389 | |
9ae54c84 | 390 | return TX_CONTINUE; |
e2ebc74d JB |
391 | } |
392 | ||
9ae54c84 | 393 | static ieee80211_tx_result |
5cf121c3 | 394 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
395 | { |
396 | struct sta_info *sta = tx->sta; | |
e039fa4a | 397 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
07346f81 | 398 | u32 staflags; |
0795af57 | 399 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
400 | |
401 | if (unlikely(!sta || | |
402 | ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && | |
403 | (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) | |
9ae54c84 | 404 | return TX_CONTINUE; |
e2ebc74d | 405 | |
07346f81 JB |
406 | staflags = get_sta_flags(sta); |
407 | ||
408 | if (unlikely((staflags & WLAN_STA_PS) && | |
409 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 410 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 | 411 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 412 | "before %d)\n", |
0795af57 | 413 | print_mac(mac, sta->addr), sta->aid, |
e2ebc74d JB |
414 | skb_queue_len(&sta->ps_tx_buf)); |
415 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
416 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
417 | purge_old_ps_buffers(tx->local); | |
418 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
419 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
420 | if (net_ratelimit()) { | |
0795af57 | 421 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 422 | "buffer full - dropping oldest frame\n", |
0795af57 | 423 | tx->dev->name, print_mac(mac, sta->addr)); |
e2ebc74d JB |
424 | } |
425 | dev_kfree_skb(old); | |
426 | } else | |
427 | tx->local->total_ps_buffered++; | |
004c872e | 428 | |
e2ebc74d | 429 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
430 | if (skb_queue_empty(&sta->ps_tx_buf)) |
431 | sta_info_set_tim_bit(sta); | |
432 | ||
e039fa4a | 433 | info->control.jiffies = jiffies; |
e2ebc74d | 434 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 435 | return TX_QUEUED; |
e2ebc74d JB |
436 | } |
437 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 438 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0795af57 | 439 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 440 | "set -> send frame\n", tx->dev->name, |
0795af57 | 441 | print_mac(mac, sta->addr)); |
e2ebc74d JB |
442 | } |
443 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 444 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 445 | |
9ae54c84 | 446 | return TX_CONTINUE; |
e2ebc74d JB |
447 | } |
448 | ||
9ae54c84 | 449 | static ieee80211_tx_result |
5cf121c3 | 450 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 451 | { |
5cf121c3 | 452 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 453 | return TX_CONTINUE; |
e2ebc74d | 454 | |
5cf121c3 | 455 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
456 | return ieee80211_tx_h_unicast_ps_buf(tx); |
457 | else | |
458 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
459 | } | |
460 | ||
9ae54c84 | 461 | static ieee80211_tx_result |
5cf121c3 | 462 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 463 | { |
d4e46a3d | 464 | struct ieee80211_key *key; |
e039fa4a | 465 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
176e4f84 | 466 | u16 fc = tx->fc; |
d4e46a3d | 467 | |
e039fa4a | 468 | if (unlikely(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT)) |
e2ebc74d | 469 | tx->key = NULL; |
d4e46a3d JB |
470 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
471 | tx->key = key; | |
472 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
473 | tx->key = key; | |
e2ebc74d | 474 | else if (tx->sdata->drop_unencrypted && |
e039fa4a JB |
475 | !(info->flags & IEEE80211_TX_CTL_EAPOL_FRAME) && |
476 | !(info->flags & IEEE80211_TX_CTL_INJECTED)) { | |
e2ebc74d | 477 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 478 | return TX_DROP; |
176e4f84 | 479 | } else |
e2ebc74d JB |
480 | tx->key = NULL; |
481 | ||
482 | if (tx->key) { | |
176e4f84 JB |
483 | u16 ftype, stype; |
484 | ||
e2ebc74d | 485 | tx->key->tx_rx_count++; |
011bfcc4 | 486 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
487 | |
488 | switch (tx->key->conf.alg) { | |
489 | case ALG_WEP: | |
490 | ftype = fc & IEEE80211_FCTL_FTYPE; | |
491 | stype = fc & IEEE80211_FCTL_STYPE; | |
492 | ||
493 | if (ftype == IEEE80211_FTYPE_MGMT && | |
494 | stype == IEEE80211_STYPE_AUTH) | |
495 | break; | |
496 | case ALG_TKIP: | |
497 | case ALG_CCMP: | |
498 | if (!WLAN_FC_DATA_PRESENT(fc)) | |
499 | tx->key = NULL; | |
500 | break; | |
501 | } | |
e2ebc74d JB |
502 | } |
503 | ||
176e4f84 | 504 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
e039fa4a | 505 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; |
176e4f84 | 506 | |
9ae54c84 | 507 | return TX_CONTINUE; |
e2ebc74d JB |
508 | } |
509 | ||
9ae54c84 | 510 | static ieee80211_tx_result |
5cf121c3 | 511 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 512 | { |
1abbe498 | 513 | struct rate_selection rsel; |
8318d78a | 514 | struct ieee80211_supported_band *sband; |
e039fa4a | 515 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
8318d78a | 516 | |
2e92e6f2 | 517 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d | 518 | |
2e92e6f2 | 519 | if (likely(tx->rate_idx < 0)) { |
8318d78a | 520 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
2e92e6f2 JB |
521 | tx->rate_idx = rsel.rate_idx; |
522 | if (unlikely(rsel.probe_idx >= 0)) { | |
e039fa4a | 523 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
5cf121c3 | 524 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e039fa4a | 525 | info->control.alt_retry_rate_idx = tx->rate_idx; |
2e92e6f2 | 526 | tx->rate_idx = rsel.probe_idx; |
58d4185e | 527 | } else |
e039fa4a | 528 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 529 | |
2e92e6f2 | 530 | if (unlikely(tx->rate_idx < 0)) |
9ae54c84 | 531 | return TX_DROP; |
58d4185e | 532 | } else |
e039fa4a | 533 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 534 | |
8318d78a | 535 | if (tx->sdata->bss_conf.use_cts_prot && |
2e92e6f2 JB |
536 | (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) { |
537 | tx->last_frag_rate_idx = tx->rate_idx; | |
538 | if (rsel.probe_idx >= 0) | |
5cf121c3 | 539 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 540 | else |
5cf121c3 | 541 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
2e92e6f2 | 542 | tx->rate_idx = rsel.nonerp_idx; |
e039fa4a JB |
543 | info->tx_rate_idx = rsel.nonerp_idx; |
544 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 545 | } else { |
2e92e6f2 | 546 | tx->last_frag_rate_idx = tx->rate_idx; |
e039fa4a | 547 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 548 | } |
e039fa4a | 549 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 550 | |
9ae54c84 | 551 | return TX_CONTINUE; |
e2ebc74d JB |
552 | } |
553 | ||
9ae54c84 | 554 | static ieee80211_tx_result |
5cf121c3 | 555 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
556 | { |
557 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
7e9ed188 | 558 | u16 fc = le16_to_cpu(hdr->frame_control); |
e2ebc74d | 559 | u16 dur; |
e039fa4a | 560 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
2e92e6f2 JB |
561 | struct ieee80211_supported_band *sband; |
562 | ||
563 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
e2ebc74d | 564 | |
e039fa4a JB |
565 | if (tx->sta) |
566 | info->control.aid = tx->sta->aid; | |
567 | ||
568 | if (!info->control.retry_limit) { | |
58d4185e | 569 | if (!is_multicast_ether_addr(hdr->addr1)) { |
e039fa4a JB |
570 | int len = min_t(int, tx->skb->len + FCS_LEN, |
571 | tx->local->fragmentation_threshold); | |
572 | if (len > tx->local->rts_threshold | |
58d4185e | 573 | && tx->local->rts_threshold < |
e039fa4a JB |
574 | IEEE80211_MAX_RTS_THRESHOLD) { |
575 | info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS; | |
576 | info->flags |= | |
577 | IEEE80211_TX_CTL_LONG_RETRY_LIMIT; | |
578 | info->control.retry_limit = | |
58d4185e JB |
579 | tx->local->long_retry_limit; |
580 | } else { | |
e039fa4a | 581 | info->control.retry_limit = |
58d4185e JB |
582 | tx->local->short_retry_limit; |
583 | } | |
e2ebc74d | 584 | } else { |
e039fa4a | 585 | info->control.retry_limit = 1; |
e2ebc74d | 586 | } |
e2ebc74d JB |
587 | } |
588 | ||
5cf121c3 | 589 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
590 | /* Do not use multiple retry rates when sending fragmented |
591 | * frames. | |
592 | * TODO: The last fragment could still use multiple retry | |
593 | * rates. */ | |
e039fa4a | 594 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
595 | } |
596 | ||
597 | /* Use CTS protection for unicast frames sent using extended rates if | |
598 | * there are associated non-ERP stations and RTS/CTS is not configured | |
599 | * for the frame. */ | |
8318d78a | 600 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
2e92e6f2 | 601 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) && |
5cf121c3 | 602 | (tx->flags & IEEE80211_TX_UNICAST) && |
471b3efd | 603 | tx->sdata->bss_conf.use_cts_prot && |
e039fa4a JB |
604 | !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)) |
605 | info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT; | |
e2ebc74d | 606 | |
7e9ed188 DD |
607 | /* Transmit data frames using short preambles if the driver supports |
608 | * short preambles at the selected rate and short preambles are | |
609 | * available on the network at the current point in time. */ | |
610 | if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
2e92e6f2 | 611 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 612 | tx->sdata->bss_conf.use_short_preamble && |
07346f81 | 613 | (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) { |
e039fa4a | 614 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; |
7e9ed188 DD |
615 | } |
616 | ||
e2ebc74d JB |
617 | /* Setup duration field for the first fragment of the frame. Duration |
618 | * for remaining fragments will be updated when they are being sent | |
619 | * to low-level driver in ieee80211_tx(). */ | |
620 | dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1), | |
5cf121c3 JB |
621 | (tx->flags & IEEE80211_TX_FRAGMENTED) ? |
622 | tx->extra_frag[0]->len : 0); | |
e2ebc74d JB |
623 | hdr->duration_id = cpu_to_le16(dur); |
624 | ||
e039fa4a JB |
625 | if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) || |
626 | (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) { | |
8318d78a | 627 | struct ieee80211_supported_band *sband; |
2e92e6f2 JB |
628 | struct ieee80211_rate *rate; |
629 | s8 baserate = -1; | |
8318d78a JB |
630 | int idx; |
631 | ||
2e92e6f2 | 632 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d JB |
633 | |
634 | /* Do not use multiple retry rates when using RTS/CTS */ | |
e039fa4a | 635 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
636 | |
637 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
2e92e6f2 | 638 | rate = &sband->bitrates[tx->rate_idx]; |
8318d78a JB |
639 | |
640 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
641 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
642 | continue; | |
643 | if (tx->sdata->basic_rates & BIT(idx) && | |
2e92e6f2 JB |
644 | (baserate < 0 || |
645 | (sband->bitrates[baserate].bitrate | |
646 | < sband->bitrates[idx].bitrate))) | |
647 | baserate = idx; | |
8318d78a | 648 | } |
e2ebc74d | 649 | |
2e92e6f2 | 650 | if (baserate >= 0) |
e039fa4a | 651 | info->control.rts_cts_rate_idx = baserate; |
8318d78a | 652 | else |
e039fa4a | 653 | info->control.rts_cts_rate_idx = 0; |
e2ebc74d JB |
654 | } |
655 | ||
e2454948 | 656 | if (tx->sta) |
e039fa4a | 657 | info->control.aid = tx->sta->aid; |
e2454948 JB |
658 | |
659 | return TX_CONTINUE; | |
660 | } | |
661 | ||
662 | static ieee80211_tx_result | |
663 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) | |
664 | { | |
665 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
666 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; | |
667 | struct sk_buff **frags, *first, *frag; | |
668 | int i; | |
669 | u16 seq; | |
670 | u8 *pos; | |
671 | int frag_threshold = tx->local->fragmentation_threshold; | |
672 | ||
673 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
674 | return TX_CONTINUE; | |
675 | ||
eefce91a JB |
676 | /* |
677 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
678 | * This is an error and needs to be fixed elsewhere, but when | |
679 | * done needs to take care of monitor interfaces (injection) | |
680 | * etc. | |
681 | */ | |
682 | if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU || | |
683 | IEEE80211_SKB_CB(tx->skb)->queue >= tx->local->hw.queues)) | |
684 | return TX_DROP; | |
685 | ||
e2454948 JB |
686 | first = tx->skb; |
687 | ||
688 | hdrlen = ieee80211_get_hdrlen(tx->fc); | |
689 | payload_len = first->len - hdrlen; | |
690 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
691 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
692 | ||
693 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
694 | if (!frags) | |
695 | goto fail; | |
696 | ||
697 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
698 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
699 | pos = first->data + hdrlen + per_fragm; | |
700 | left = payload_len - per_fragm; | |
701 | for (i = 0; i < num_fragm - 1; i++) { | |
702 | struct ieee80211_hdr *fhdr; | |
703 | size_t copylen; | |
704 | ||
705 | if (left <= 0) | |
706 | goto fail; | |
707 | ||
708 | /* reserve enough extra head and tail room for possible | |
709 | * encryption */ | |
710 | frag = frags[i] = | |
711 | dev_alloc_skb(tx->local->tx_headroom + | |
712 | frag_threshold + | |
713 | IEEE80211_ENCRYPT_HEADROOM + | |
714 | IEEE80211_ENCRYPT_TAILROOM); | |
715 | if (!frag) | |
716 | goto fail; | |
717 | /* Make sure that all fragments use the same priority so | |
718 | * that they end up using the same TX queue */ | |
719 | frag->priority = first->priority; | |
720 | skb_reserve(frag, tx->local->tx_headroom + | |
721 | IEEE80211_ENCRYPT_HEADROOM); | |
722 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
723 | memcpy(fhdr, first->data, hdrlen); | |
724 | if (i == num_fragm - 2) | |
725 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
726 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
727 | copylen = left > per_fragm ? per_fragm : left; | |
728 | memcpy(skb_put(frag, copylen), pos, copylen); | |
729 | ||
730 | pos += copylen; | |
731 | left -= copylen; | |
e2ebc74d | 732 | } |
e2454948 JB |
733 | skb_trim(first, hdrlen + per_fragm); |
734 | ||
735 | tx->num_extra_frag = num_fragm - 1; | |
736 | tx->extra_frag = frags; | |
e2ebc74d | 737 | |
9ae54c84 | 738 | return TX_CONTINUE; |
e2454948 JB |
739 | |
740 | fail: | |
741 | printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); | |
742 | if (frags) { | |
743 | for (i = 0; i < num_fragm - 1; i++) | |
744 | if (frags[i]) | |
745 | dev_kfree_skb(frags[i]); | |
746 | kfree(frags); | |
747 | } | |
748 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
749 | return TX_DROP; | |
e2ebc74d JB |
750 | } |
751 | ||
9ae54c84 | 752 | static ieee80211_tx_result |
e2454948 JB |
753 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
754 | { | |
755 | if (!tx->key) | |
756 | return TX_CONTINUE; | |
757 | ||
758 | switch (tx->key->conf.alg) { | |
759 | case ALG_WEP: | |
760 | return ieee80211_crypto_wep_encrypt(tx); | |
761 | case ALG_TKIP: | |
762 | return ieee80211_crypto_tkip_encrypt(tx); | |
763 | case ALG_CCMP: | |
764 | return ieee80211_crypto_ccmp_encrypt(tx); | |
765 | } | |
766 | ||
767 | /* not reached */ | |
768 | WARN_ON(1); | |
769 | return TX_DROP; | |
770 | } | |
771 | ||
772 | static ieee80211_tx_result | |
773 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) | |
e2ebc74d JB |
774 | { |
775 | struct ieee80211_local *local = tx->local; | |
e2ebc74d JB |
776 | struct sk_buff *skb = tx->skb; |
777 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
778 | u32 load = 0, hdrtime; | |
2e92e6f2 JB |
779 | struct ieee80211_rate *rate; |
780 | struct ieee80211_supported_band *sband; | |
e039fa4a | 781 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2e92e6f2 JB |
782 | |
783 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
784 | rate = &sband->bitrates[tx->rate_idx]; | |
e2ebc74d JB |
785 | |
786 | /* TODO: this could be part of tx_status handling, so that the number | |
787 | * of retries would be known; TX rate should in that case be stored | |
788 | * somewhere with the packet */ | |
789 | ||
790 | /* Estimate total channel use caused by this frame */ | |
791 | ||
792 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
793 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
794 | ||
5cf121c3 JB |
795 | if (tx->channel->band == IEEE80211_BAND_5GHZ || |
796 | (tx->channel->band == IEEE80211_BAND_2GHZ && | |
8318d78a | 797 | rate->flags & IEEE80211_RATE_ERP_G)) |
e2ebc74d JB |
798 | hdrtime = CHAN_UTIL_HDR_SHORT; |
799 | else | |
800 | hdrtime = CHAN_UTIL_HDR_LONG; | |
801 | ||
802 | load = hdrtime; | |
803 | if (!is_multicast_ether_addr(hdr->addr1)) | |
804 | load += hdrtime; | |
805 | ||
e039fa4a | 806 | if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) |
e2ebc74d | 807 | load += 2 * hdrtime; |
e039fa4a | 808 | else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT) |
e2ebc74d JB |
809 | load += hdrtime; |
810 | ||
8318d78a JB |
811 | /* TODO: optimise again */ |
812 | load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate; | |
e2ebc74d | 813 | |
5cf121c3 | 814 | if (tx->extra_frag) { |
e2ebc74d | 815 | int i; |
5cf121c3 | 816 | for (i = 0; i < tx->num_extra_frag; i++) { |
e2ebc74d | 817 | load += 2 * hdrtime; |
5cf121c3 | 818 | load += tx->extra_frag[i]->len * |
2e92e6f2 | 819 | rate->bitrate; |
e2ebc74d JB |
820 | } |
821 | } | |
822 | ||
823 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
824 | load >>= CHAN_UTIL_SHIFT; | |
825 | local->channel_use_raw += load; | |
826 | if (tx->sta) | |
827 | tx->sta->channel_use_raw += load; | |
828 | tx->sdata->channel_use_raw += load; | |
829 | ||
e2454948 JB |
830 | if (tx->sta) { |
831 | tx->sta->tx_packets++; | |
832 | tx->sta->tx_fragments++; | |
833 | tx->sta->tx_bytes += tx->skb->len; | |
834 | if (tx->extra_frag) { | |
835 | int i; | |
836 | tx->sta->tx_fragments += tx->num_extra_frag; | |
837 | for (i = 0; i < tx->num_extra_frag; i++) { | |
838 | tx->sta->tx_bytes += | |
839 | tx->extra_frag[i]->len; | |
840 | } | |
841 | } | |
842 | } | |
843 | ||
9ae54c84 | 844 | return TX_CONTINUE; |
e2ebc74d JB |
845 | } |
846 | ||
e2ebc74d | 847 | |
5cf121c3 | 848 | typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *); |
58905290 | 849 | static ieee80211_tx_handler ieee80211_tx_handlers[] = |
e2ebc74d JB |
850 | { |
851 | ieee80211_tx_h_check_assoc, | |
852 | ieee80211_tx_h_sequence, | |
853 | ieee80211_tx_h_ps_buf, | |
854 | ieee80211_tx_h_select_key, | |
855 | ieee80211_tx_h_michael_mic_add, | |
e2ebc74d JB |
856 | ieee80211_tx_h_rate_ctrl, |
857 | ieee80211_tx_h_misc, | |
e2454948 | 858 | ieee80211_tx_h_fragment, |
e039fa4a | 859 | /* handlers after fragment must be aware of tx info fragmentation! */ |
e2454948 JB |
860 | ieee80211_tx_h_encrypt, |
861 | ieee80211_tx_h_stats, | |
e2ebc74d JB |
862 | NULL |
863 | }; | |
864 | ||
865 | /* actual transmit path */ | |
866 | ||
867 | /* | |
868 | * deal with packet injection down monitor interface | |
869 | * with Radiotap Header -- only called for monitor mode interface | |
870 | */ | |
9ae54c84 | 871 | static ieee80211_tx_result |
5cf121c3 | 872 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 873 | struct sk_buff *skb) |
e2ebc74d JB |
874 | { |
875 | /* | |
876 | * this is the moment to interpret and discard the radiotap header that | |
877 | * must be at the start of the packet injected in Monitor mode | |
878 | * | |
879 | * Need to take some care with endian-ness since radiotap | |
880 | * args are little-endian | |
881 | */ | |
882 | ||
883 | struct ieee80211_radiotap_iterator iterator; | |
884 | struct ieee80211_radiotap_header *rthdr = | |
885 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 886 | struct ieee80211_supported_band *sband; |
e2ebc74d | 887 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
e039fa4a | 888 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 889 | |
2e92e6f2 | 890 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 891 | |
e039fa4a JB |
892 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; |
893 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
5cf121c3 | 894 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
895 | |
896 | /* | |
897 | * for every radiotap entry that is present | |
898 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
899 | * entries present, or -EINVAL on error) | |
900 | */ | |
901 | ||
902 | while (!ret) { | |
903 | int i, target_rate; | |
904 | ||
905 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
906 | ||
907 | if (ret) | |
908 | continue; | |
909 | ||
910 | /* see if this argument is something we can use */ | |
911 | switch (iterator.this_arg_index) { | |
912 | /* | |
913 | * You must take care when dereferencing iterator.this_arg | |
914 | * for multibyte types... the pointer is not aligned. Use | |
915 | * get_unaligned((type *)iterator.this_arg) to dereference | |
916 | * iterator.this_arg for type "type" safely on all arches. | |
917 | */ | |
918 | case IEEE80211_RADIOTAP_RATE: | |
919 | /* | |
920 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
921 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
922 | */ | |
923 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
924 | for (i = 0; i < sband->n_bitrates; i++) { |
925 | struct ieee80211_rate *r; | |
e2ebc74d | 926 | |
8318d78a JB |
927 | r = &sband->bitrates[i]; |
928 | ||
929 | if (r->bitrate == target_rate) { | |
2e92e6f2 | 930 | tx->rate_idx = i; |
58d4185e JB |
931 | break; |
932 | } | |
e2ebc74d JB |
933 | } |
934 | break; | |
935 | ||
936 | case IEEE80211_RADIOTAP_ANTENNA: | |
937 | /* | |
938 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
939 | * 1st ant | |
940 | */ | |
e039fa4a | 941 | info->antenna_sel_tx = (*iterator.this_arg) + 1; |
e2ebc74d JB |
942 | break; |
943 | ||
8318d78a | 944 | #if 0 |
e2ebc74d JB |
945 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
946 | control->power_level = *iterator.this_arg; | |
947 | break; | |
8318d78a | 948 | #endif |
e2ebc74d JB |
949 | |
950 | case IEEE80211_RADIOTAP_FLAGS: | |
951 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
952 | /* | |
953 | * this indicates that the skb we have been | |
954 | * handed has the 32-bit FCS CRC at the end... | |
955 | * we should react to that by snipping it off | |
956 | * because it will be recomputed and added | |
957 | * on transmission | |
958 | */ | |
959 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 960 | return TX_DROP; |
e2ebc74d JB |
961 | |
962 | skb_trim(skb, skb->len - FCS_LEN); | |
963 | } | |
58d4185e | 964 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
e039fa4a JB |
965 | info->flags &= |
966 | ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT; | |
58d4185e | 967 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 968 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
969 | break; |
970 | ||
58d4185e JB |
971 | /* |
972 | * Please update the file | |
973 | * Documentation/networking/mac80211-injection.txt | |
974 | * when parsing new fields here. | |
975 | */ | |
976 | ||
e2ebc74d JB |
977 | default: |
978 | break; | |
979 | } | |
980 | } | |
981 | ||
982 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 983 | return TX_DROP; |
e2ebc74d JB |
984 | |
985 | /* | |
986 | * remove the radiotap header | |
987 | * iterator->max_length was sanity-checked against | |
988 | * skb->len by iterator init | |
989 | */ | |
990 | skb_pull(skb, iterator.max_length); | |
991 | ||
9ae54c84 | 992 | return TX_CONTINUE; |
e2ebc74d JB |
993 | } |
994 | ||
58d4185e JB |
995 | /* |
996 | * initialises @tx | |
997 | */ | |
9ae54c84 | 998 | static ieee80211_tx_result |
5cf121c3 | 999 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 1000 | struct sk_buff *skb, |
e039fa4a | 1001 | struct net_device *dev) |
e2ebc74d JB |
1002 | { |
1003 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 1004 | struct ieee80211_hdr *hdr; |
e2ebc74d | 1005 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 1006 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1007 | |
1008 | int hdrlen; | |
1009 | ||
1010 | memset(tx, 0, sizeof(*tx)); | |
1011 | tx->skb = skb; | |
1012 | tx->dev = dev; /* use original interface */ | |
1013 | tx->local = local; | |
1014 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 1015 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 1016 | /* |
58d4185e JB |
1017 | * Set this flag (used below to indicate "automatic fragmentation"), |
1018 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 1019 | */ |
5cf121c3 | 1020 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1021 | |
1022 | /* process and remove the injection radiotap header */ | |
1023 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
51fb61e7 | 1024 | if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { |
9ae54c84 JB |
1025 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
1026 | return TX_DROP; | |
58d4185e | 1027 | |
e2ebc74d | 1028 | /* |
58d4185e JB |
1029 | * __ieee80211_parse_tx_radiotap has now removed |
1030 | * the radiotap header that was present and pre-filled | |
1031 | * 'tx' with tx control information. | |
e2ebc74d | 1032 | */ |
e2ebc74d JB |
1033 | } |
1034 | ||
58d4185e JB |
1035 | hdr = (struct ieee80211_hdr *) skb->data; |
1036 | ||
24338793 | 1037 | tx->sta = sta_info_get(local, hdr->addr1); |
1038 | tx->fc = le16_to_cpu(hdr->frame_control); | |
58d4185e | 1039 | |
badffb72 | 1040 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1041 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1042 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1043 | } else { |
5cf121c3 | 1044 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 1045 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1046 | } |
58d4185e | 1047 | |
5cf121c3 JB |
1048 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1049 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e JB |
1050 | skb->len + FCS_LEN > local->fragmentation_threshold && |
1051 | !local->ops->set_frag_threshold) | |
5cf121c3 | 1052 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1053 | else |
5cf121c3 | 1054 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1055 | } |
1056 | ||
e2ebc74d | 1057 | if (!tx->sta) |
e039fa4a | 1058 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1059 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1060 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1061 | |
e2ebc74d JB |
1062 | hdrlen = ieee80211_get_hdrlen(tx->fc); |
1063 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { | |
1064 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1065 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1066 | } | |
e039fa4a | 1067 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1068 | |
9ae54c84 | 1069 | return TX_CONTINUE; |
e2ebc74d JB |
1070 | } |
1071 | ||
32bfd35d | 1072 | /* |
58d4185e JB |
1073 | * NB: @tx is uninitialised when passed in here |
1074 | */ | |
5cf121c3 | 1075 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e | 1076 | struct sk_buff *skb, |
e039fa4a | 1077 | struct net_device *mdev) |
e2ebc74d | 1078 | { |
e039fa4a | 1079 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1080 | struct net_device *dev; |
1081 | ||
e039fa4a | 1082 | dev = dev_get_by_index(&init_net, info->control.ifindex); |
e2ebc74d JB |
1083 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1084 | dev_put(dev); | |
1085 | dev = NULL; | |
1086 | } | |
1087 | if (unlikely(!dev)) | |
1088 | return -ENODEV; | |
58d4185e | 1089 | /* initialises tx with control */ |
e039fa4a | 1090 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1091 | dev_put(dev); |
e2ebc74d JB |
1092 | return 0; |
1093 | } | |
1094 | ||
1095 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1096 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1097 | { |
e039fa4a | 1098 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1099 | int ret, i; |
1100 | ||
1101 | if (!ieee80211_qdisc_installed(local->mdev) && | |
1102 | __ieee80211_queue_stopped(local, 0)) { | |
1103 | netif_stop_queue(local->mdev); | |
1104 | return IEEE80211_TX_AGAIN; | |
1105 | } | |
1106 | if (skb) { | |
dd1cd4c6 JB |
1107 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
1108 | "TX to low-level driver", skb); | |
e039fa4a | 1109 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1110 | if (ret) |
1111 | return IEEE80211_TX_AGAIN; | |
1112 | local->mdev->trans_start = jiffies; | |
1113 | ieee80211_led_tx(local, 1); | |
1114 | } | |
5cf121c3 | 1115 | if (tx->extra_frag) { |
5cf121c3 JB |
1116 | for (i = 0; i < tx->num_extra_frag; i++) { |
1117 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1118 | continue; |
e039fa4a JB |
1119 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
1120 | info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS | | |
1121 | IEEE80211_TX_CTL_USE_CTS_PROTECT | | |
1122 | IEEE80211_TX_CTL_CLEAR_PS_FILT | | |
1123 | IEEE80211_TX_CTL_FIRST_FRAGMENT); | |
1124 | if (__ieee80211_queue_stopped(local, info->queue)) | |
e2ebc74d | 1125 | return IEEE80211_TX_FRAG_AGAIN; |
5cf121c3 | 1126 | if (i == tx->num_extra_frag) { |
e039fa4a | 1127 | info->tx_rate_idx = tx->last_frag_rate_idx; |
8318d78a | 1128 | |
5cf121c3 | 1129 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e039fa4a JB |
1130 | info->flags |= |
1131 | IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 1132 | else |
e039fa4a JB |
1133 | info->flags &= |
1134 | ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d JB |
1135 | } |
1136 | ||
dd1cd4c6 | 1137 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
e2ebc74d | 1138 | "TX to low-level driver", |
5cf121c3 | 1139 | tx->extra_frag[i]); |
e2ebc74d | 1140 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1141 | tx->extra_frag[i]); |
e2ebc74d JB |
1142 | if (ret) |
1143 | return IEEE80211_TX_FRAG_AGAIN; | |
1144 | local->mdev->trans_start = jiffies; | |
1145 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1146 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1147 | } |
5cf121c3 JB |
1148 | kfree(tx->extra_frag); |
1149 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1150 | } |
1151 | return IEEE80211_TX_OK; | |
1152 | } | |
1153 | ||
e039fa4a | 1154 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1155 | { |
1156 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1157 | struct sta_info *sta; | |
1158 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1159 | struct ieee80211_tx_data tx; |
9ae54c84 | 1160 | ieee80211_tx_result res = TX_DROP, res_prepare; |
e039fa4a | 1161 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1162 | int ret, i; |
e039fa4a | 1163 | int queue = info->queue; |
e2ebc74d | 1164 | |
e039fa4a | 1165 | WARN_ON(__ieee80211_queue_pending(local, queue)); |
e2ebc74d JB |
1166 | |
1167 | if (unlikely(skb->len < 10)) { | |
1168 | dev_kfree_skb(skb); | |
1169 | return 0; | |
1170 | } | |
1171 | ||
d0709a65 JB |
1172 | rcu_read_lock(); |
1173 | ||
58d4185e | 1174 | /* initialises tx */ |
e039fa4a | 1175 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1176 | |
9ae54c84 | 1177 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1178 | dev_kfree_skb(skb); |
d0709a65 | 1179 | rcu_read_unlock(); |
e2ebc74d JB |
1180 | return 0; |
1181 | } | |
1182 | ||
1183 | sta = tx.sta; | |
5cf121c3 | 1184 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1185 | info->band = tx.channel->band; |
e2ebc74d | 1186 | |
58905290 | 1187 | for (handler = ieee80211_tx_handlers; *handler != NULL; |
58d4185e JB |
1188 | handler++) { |
1189 | res = (*handler)(&tx); | |
9ae54c84 | 1190 | if (res != TX_CONTINUE) |
58d4185e | 1191 | break; |
e2ebc74d JB |
1192 | } |
1193 | ||
e039fa4a JB |
1194 | if (WARN_ON(tx.skb != skb)) |
1195 | goto drop; | |
e2ebc74d | 1196 | |
9ae54c84 | 1197 | if (unlikely(res == TX_DROP)) { |
e2ebc74d JB |
1198 | I802_DEBUG_INC(local->tx_handlers_drop); |
1199 | goto drop; | |
1200 | } | |
1201 | ||
9ae54c84 | 1202 | if (unlikely(res == TX_QUEUED)) { |
e2ebc74d | 1203 | I802_DEBUG_INC(local->tx_handlers_queued); |
d4e46a3d | 1204 | rcu_read_unlock(); |
e2ebc74d JB |
1205 | return 0; |
1206 | } | |
1207 | ||
5cf121c3 JB |
1208 | if (tx.extra_frag) { |
1209 | for (i = 0; i < tx.num_extra_frag; i++) { | |
e2ebc74d JB |
1210 | int next_len, dur; |
1211 | struct ieee80211_hdr *hdr = | |
1212 | (struct ieee80211_hdr *) | |
5cf121c3 | 1213 | tx.extra_frag[i]->data; |
e2ebc74d | 1214 | |
5cf121c3 JB |
1215 | if (i + 1 < tx.num_extra_frag) { |
1216 | next_len = tx.extra_frag[i + 1]->len; | |
e2ebc74d JB |
1217 | } else { |
1218 | next_len = 0; | |
2e92e6f2 | 1219 | tx.rate_idx = tx.last_frag_rate_idx; |
e2ebc74d JB |
1220 | } |
1221 | dur = ieee80211_duration(&tx, 0, next_len); | |
1222 | hdr->duration_id = cpu_to_le16(dur); | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | retry: | |
1227 | ret = __ieee80211_tx(local, skb, &tx); | |
1228 | if (ret) { | |
eefce91a JB |
1229 | struct ieee80211_tx_stored_packet *store; |
1230 | ||
1231 | /* | |
1232 | * Since there are no fragmented frames on A-MPDU | |
1233 | * queues, there's no reason for a driver to reject | |
1234 | * a frame there, warn and drop it. | |
1235 | */ | |
1236 | if (WARN_ON(queue >= local->hw.queues)) | |
1237 | goto drop; | |
1238 | ||
1239 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1240 | |
1241 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1242 | skb = NULL; | |
1243 | set_bit(IEEE80211_LINK_STATE_PENDING, | |
e039fa4a | 1244 | &local->state[queue]); |
e2ebc74d JB |
1245 | smp_mb(); |
1246 | /* When the driver gets out of buffers during sending of | |
1247 | * fragments and calls ieee80211_stop_queue, there is | |
1248 | * a small window between IEEE80211_LINK_STATE_XOFF and | |
1249 | * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer | |
1250 | * gets available in that window (i.e. driver calls | |
1251 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
1252 | * called with IEEE80211_LINK_STATE_PENDING. Prevent this by | |
1253 | * continuing transmitting here when that situation is | |
1254 | * possible to have happened. */ | |
e039fa4a | 1255 | if (!__ieee80211_queue_stopped(local, queue)) { |
e2ebc74d | 1256 | clear_bit(IEEE80211_LINK_STATE_PENDING, |
e039fa4a | 1257 | &local->state[queue]); |
e2ebc74d JB |
1258 | goto retry; |
1259 | } | |
e2ebc74d | 1260 | store->skb = skb; |
5cf121c3 JB |
1261 | store->extra_frag = tx.extra_frag; |
1262 | store->num_extra_frag = tx.num_extra_frag; | |
2e92e6f2 | 1263 | store->last_frag_rate_idx = tx.last_frag_rate_idx; |
badffb72 | 1264 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1265 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1266 | } |
d4e46a3d | 1267 | rcu_read_unlock(); |
e2ebc74d JB |
1268 | return 0; |
1269 | ||
1270 | drop: | |
1271 | if (skb) | |
1272 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1273 | for (i = 0; i < tx.num_extra_frag; i++) |
1274 | if (tx.extra_frag[i]) | |
1275 | dev_kfree_skb(tx.extra_frag[i]); | |
1276 | kfree(tx.extra_frag); | |
d4e46a3d | 1277 | rcu_read_unlock(); |
e2ebc74d JB |
1278 | return 0; |
1279 | } | |
1280 | ||
1281 | /* device xmit handlers */ | |
1282 | ||
1283 | int ieee80211_master_start_xmit(struct sk_buff *skb, | |
1284 | struct net_device *dev) | |
1285 | { | |
e039fa4a | 1286 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1287 | struct net_device *odev = NULL; |
1288 | struct ieee80211_sub_if_data *osdata; | |
1289 | int headroom; | |
1290 | int ret; | |
1291 | ||
e039fa4a JB |
1292 | if (info->control.ifindex) |
1293 | odev = dev_get_by_index(&init_net, info->control.ifindex); | |
e2ebc74d JB |
1294 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1295 | dev_put(odev); | |
1296 | odev = NULL; | |
1297 | } | |
1298 | if (unlikely(!odev)) { | |
1299 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1300 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1301 | "originating device\n", dev->name); | |
1302 | #endif | |
1303 | dev_kfree_skb(skb); | |
1304 | return 0; | |
1305 | } | |
e039fa4a | 1306 | |
e2ebc74d JB |
1307 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1308 | ||
1309 | headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM; | |
1310 | if (skb_headroom(skb) < headroom) { | |
1311 | if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { | |
1312 | dev_kfree_skb(skb); | |
1313 | dev_put(odev); | |
1314 | return 0; | |
1315 | } | |
1316 | } | |
1317 | ||
e039fa4a JB |
1318 | info->control.vif = &osdata->vif; |
1319 | ret = ieee80211_tx(odev, skb); | |
e2ebc74d JB |
1320 | dev_put(odev); |
1321 | ||
1322 | return ret; | |
1323 | } | |
1324 | ||
1325 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1326 | struct net_device *dev) | |
1327 | { | |
1328 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e039fa4a | 1329 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1330 | struct ieee80211_radiotap_header *prthdr = |
1331 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1332 | u16 len_rthdr; |
e2ebc74d | 1333 | |
9b8a74e3 AG |
1334 | /* check for not even having the fixed radiotap header part */ |
1335 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1336 | goto fail; /* too short to be possibly valid */ | |
1337 | ||
1338 | /* is it a header version we can trust to find length from? */ | |
1339 | if (unlikely(prthdr->it_version)) | |
1340 | goto fail; /* only version 0 is supported */ | |
1341 | ||
1342 | /* then there must be a radiotap header with a length we can use */ | |
1343 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1344 | ||
1345 | /* does the skb contain enough to deliver on the alleged length? */ | |
1346 | if (unlikely(skb->len < len_rthdr)) | |
1347 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1348 | |
1349 | skb->dev = local->mdev; | |
1350 | ||
9b8a74e3 | 1351 | /* needed because we set skb device to master */ |
e039fa4a | 1352 | info->control.ifindex = dev->ifindex; |
9b8a74e3 | 1353 | |
e039fa4a | 1354 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; |
b0a67179 | 1355 | /* Interfaces should always request a status report */ |
e039fa4a | 1356 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
e2ebc74d | 1357 | |
e2ebc74d JB |
1358 | /* |
1359 | * fix up the pointers accounting for the radiotap | |
1360 | * header still being in there. We are being given | |
1361 | * a precooked IEEE80211 header so no need for | |
1362 | * normal processing | |
1363 | */ | |
9b8a74e3 | 1364 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1365 | /* |
9b8a74e3 AG |
1366 | * these are just fixed to the end of the rt area since we |
1367 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1368 | */ |
9b8a74e3 AG |
1369 | skb_set_network_header(skb, len_rthdr); |
1370 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1371 | |
9b8a74e3 AG |
1372 | /* pass the radiotap header up to the next stage intact */ |
1373 | dev_queue_xmit(skb); | |
e2ebc74d | 1374 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1375 | |
1376 | fail: | |
1377 | dev_kfree_skb(skb); | |
1378 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1379 | } |
1380 | ||
1381 | /** | |
1382 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1383 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1384 | * @skb: packet to be sent | |
1385 | * @dev: incoming interface | |
1386 | * | |
1387 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1388 | * not be freed, and caller is responsible for either retrying later or freeing | |
1389 | * skb). | |
1390 | * | |
1391 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1392 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1393 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1394 | * transmission (through low-level driver). | |
1395 | */ | |
1396 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1397 | struct net_device *dev) | |
1398 | { | |
1399 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e039fa4a | 1400 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1401 | struct ieee80211_sub_if_data *sdata; |
1402 | int ret = 1, head_need; | |
33b64eb2 | 1403 | u16 ethertype, hdrlen, meshhdrlen = 0, fc; |
e2ebc74d | 1404 | struct ieee80211_hdr hdr; |
33b64eb2 | 1405 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1406 | const u8 *encaps_data; |
1407 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1408 | int nh_pos, h_pos; |
e2ebc74d | 1409 | struct sta_info *sta; |
ce3edf6d | 1410 | u32 sta_flags = 0; |
e2ebc74d JB |
1411 | |
1412 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1413 | if (unlikely(skb->len < ETH_HLEN)) { | |
1414 | printk(KERN_DEBUG "%s: short skb (len=%d)\n", | |
1415 | dev->name, skb->len); | |
1416 | ret = 0; | |
1417 | goto fail; | |
1418 | } | |
1419 | ||
1420 | nh_pos = skb_network_header(skb) - skb->data; | |
1421 | h_pos = skb_transport_header(skb) - skb->data; | |
1422 | ||
1423 | /* convert Ethernet header to proper 802.11 header (based on | |
1424 | * operation mode) */ | |
1425 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
e2ebc74d JB |
1426 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; |
1427 | ||
51fb61e7 | 1428 | switch (sdata->vif.type) { |
cf966838 JB |
1429 | case IEEE80211_IF_TYPE_AP: |
1430 | case IEEE80211_IF_TYPE_VLAN: | |
e2ebc74d JB |
1431 | fc |= IEEE80211_FCTL_FROMDS; |
1432 | /* DA BSSID SA */ | |
1433 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1434 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1435 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1436 | hdrlen = 24; | |
cf966838 JB |
1437 | break; |
1438 | case IEEE80211_IF_TYPE_WDS: | |
e2ebc74d JB |
1439 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; |
1440 | /* RA TA DA SA */ | |
1441 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1442 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1443 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1444 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1445 | hdrlen = 30; | |
cf966838 | 1446 | break; |
33b64eb2 LCC |
1447 | #ifdef CONFIG_MAC80211_MESH |
1448 | case IEEE80211_IF_TYPE_MESH_POINT: | |
1449 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; | |
1450 | /* RA TA DA SA */ | |
1451 | if (is_multicast_ether_addr(skb->data)) | |
1452 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1453 | else if (mesh_nexthop_lookup(hdr.addr1, skb, dev)) | |
1454 | return 0; | |
1455 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1456 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1457 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1458 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
1459 | /* Forwarded frame, keep mesh ttl and seqnum */ | |
1460 | struct ieee80211s_hdr *prev_meshhdr; | |
1461 | prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb); | |
1462 | meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr); | |
1463 | memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen); | |
1464 | sdata->u.sta.mshstats.fwded_frames++; | |
1465 | } else { | |
1466 | if (!sdata->u.sta.mshcfg.dot11MeshTTL) { | |
1467 | /* Do not send frames with mesh_ttl == 0 */ | |
1468 | sdata->u.sta.mshstats.dropped_frames_ttl++; | |
1469 | ret = 0; | |
1470 | goto fail; | |
1471 | } | |
1472 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
902acc78 | 1473 | sdata); |
33b64eb2 LCC |
1474 | } |
1475 | hdrlen = 30; | |
1476 | break; | |
1477 | #endif | |
cf966838 | 1478 | case IEEE80211_IF_TYPE_STA: |
e2ebc74d JB |
1479 | fc |= IEEE80211_FCTL_TODS; |
1480 | /* BSSID SA DA */ | |
1481 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1482 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1483 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1484 | hdrlen = 24; | |
cf966838 JB |
1485 | break; |
1486 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1487 | /* DA SA BSSID */ |
1488 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1489 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1490 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1491 | hdrlen = 24; | |
cf966838 JB |
1492 | break; |
1493 | default: | |
e2ebc74d JB |
1494 | ret = 0; |
1495 | goto fail; | |
1496 | } | |
1497 | ||
7d185b8b JB |
1498 | /* |
1499 | * There's no need to try to look up the destination | |
1500 | * if it is a multicast address (which can only happen | |
1501 | * in AP mode) | |
1502 | */ | |
1503 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1504 | rcu_read_lock(); |
7d185b8b | 1505 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1506 | if (sta) |
07346f81 | 1507 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1508 | rcu_read_unlock(); |
e2ebc74d JB |
1509 | } |
1510 | ||
3434fbd3 JB |
1511 | /* receiver and we are QoS enabled, use a QoS type frame */ |
1512 | if (sta_flags & WLAN_STA_WME && local->hw.queues >= 4) { | |
ce3edf6d JB |
1513 | fc |= IEEE80211_STYPE_QOS_DATA; |
1514 | hdrlen += 2; | |
1515 | } | |
1516 | ||
1517 | /* | |
238814fd JB |
1518 | * Drop unicast frames to unauthorised stations unless they are |
1519 | * EAPOL frames from the local station. | |
ce3edf6d | 1520 | */ |
238814fd | 1521 | if (unlikely(!is_multicast_ether_addr(hdr.addr1) && |
33b64eb2 LCC |
1522 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1523 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1524 | compare_ether_addr(dev->dev_addr, |
1525 | skb->data + ETH_ALEN) == 0))) { | |
1526 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1527 | DECLARE_MAC_BUF(mac); | |
1528 | ||
1529 | if (net_ratelimit()) | |
1530 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1531 | " (unauthorized port)\n", dev->name, | |
1532 | print_mac(mac, hdr.addr1)); | |
1533 | #endif | |
1534 | ||
1535 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1536 | ||
1537 | ret = 0; | |
1538 | goto fail; | |
1539 | } | |
1540 | ||
e2ebc74d JB |
1541 | hdr.frame_control = cpu_to_le16(fc); |
1542 | hdr.duration_id = 0; | |
1543 | hdr.seq_ctrl = 0; | |
1544 | ||
1545 | skip_header_bytes = ETH_HLEN; | |
1546 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1547 | encaps_data = bridge_tunnel_header; | |
1548 | encaps_len = sizeof(bridge_tunnel_header); | |
1549 | skip_header_bytes -= 2; | |
1550 | } else if (ethertype >= 0x600) { | |
1551 | encaps_data = rfc1042_header; | |
1552 | encaps_len = sizeof(rfc1042_header); | |
1553 | skip_header_bytes -= 2; | |
1554 | } else { | |
1555 | encaps_data = NULL; | |
1556 | encaps_len = 0; | |
1557 | } | |
1558 | ||
1559 | skb_pull(skb, skip_header_bytes); | |
1560 | nh_pos -= skip_header_bytes; | |
1561 | h_pos -= skip_header_bytes; | |
1562 | ||
1563 | /* TODO: implement support for fragments so that there is no need to | |
1564 | * reallocate and copy payload; it might be enough to support one | |
1565 | * extra fragment that would be copied in the beginning of the frame | |
1566 | * data.. anyway, it would be nice to include this into skb structure | |
1567 | * somehow | |
1568 | * | |
1569 | * There are few options for this: | |
1570 | * use skb->cb as an extra space for 802.11 header | |
1571 | * allocate new buffer if not enough headroom | |
1572 | * make sure that there is enough headroom in every skb by increasing | |
1573 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1574 | * alloc_skb() (net/core/skbuff.c) | |
1575 | */ | |
33b64eb2 | 1576 | head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom; |
e2ebc74d JB |
1577 | head_need -= skb_headroom(skb); |
1578 | ||
1579 | /* We are going to modify skb data, so make a copy of it if happens to | |
1580 | * be cloned. This could happen, e.g., with Linux bridge code passing | |
1581 | * us broadcast frames. */ | |
1582 | ||
608961a5 | 1583 | if (head_need > 0 || skb_header_cloned(skb)) { |
e2ebc74d JB |
1584 | #if 0 |
1585 | printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " | |
1586 | "of headroom\n", dev->name, head_need); | |
1587 | #endif | |
1588 | ||
608961a5 | 1589 | if (skb_header_cloned(skb)) |
e2ebc74d JB |
1590 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); |
1591 | else | |
1592 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1593 | /* Since we have to reallocate the buffer, make sure that there | |
1594 | * is enough room for possible WEP IV/ICV and TKIP (8 bytes | |
1595 | * before payload and 12 after). */ | |
1596 | if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8), | |
1597 | 12, GFP_ATOMIC)) { | |
1598 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer" | |
1599 | "\n", dev->name); | |
1600 | goto fail; | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | if (encaps_data) { | |
1605 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1606 | nh_pos += encaps_len; | |
1607 | h_pos += encaps_len; | |
1608 | } | |
c29b9b9b | 1609 | |
33b64eb2 LCC |
1610 | if (meshhdrlen > 0) { |
1611 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1612 | nh_pos += meshhdrlen; | |
1613 | h_pos += meshhdrlen; | |
1614 | } | |
1615 | ||
c29b9b9b JB |
1616 | if (fc & IEEE80211_STYPE_QOS_DATA) { |
1617 | __le16 *qos_control; | |
1618 | ||
1619 | qos_control = (__le16*) skb_push(skb, 2); | |
1620 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1621 | /* | |
1622 | * Maybe we could actually set some fields here, for now just | |
1623 | * initialise to zero to indicate no special operation. | |
1624 | */ | |
1625 | *qos_control = 0; | |
1626 | } else | |
1627 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1628 | ||
e2ebc74d JB |
1629 | nh_pos += hdrlen; |
1630 | h_pos += hdrlen; | |
1631 | ||
e039fa4a JB |
1632 | info = IEEE80211_SKB_CB(skb); |
1633 | memset(info, 0, sizeof(*info)); | |
1634 | info->control.ifindex = dev->ifindex; | |
678f5f71 | 1635 | if (ethertype == ETH_P_PAE) |
e039fa4a | 1636 | info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME; |
e2ebc74d | 1637 | |
b0a67179 | 1638 | /* Interfaces should always request a status report */ |
e039fa4a | 1639 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
b0a67179 | 1640 | |
e2ebc74d | 1641 | skb->dev = local->mdev; |
68aae116 SH |
1642 | dev->stats.tx_packets++; |
1643 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1644 | |
1645 | /* Update skb pointers to various headers since this modified frame | |
1646 | * is going to go through Linux networking code that may potentially | |
1647 | * need things like pointer to IP header. */ | |
1648 | skb_set_mac_header(skb, 0); | |
1649 | skb_set_network_header(skb, nh_pos); | |
1650 | skb_set_transport_header(skb, h_pos); | |
1651 | ||
1652 | dev->trans_start = jiffies; | |
1653 | dev_queue_xmit(skb); | |
1654 | ||
1655 | return 0; | |
1656 | ||
1657 | fail: | |
1658 | if (!ret) | |
1659 | dev_kfree_skb(skb); | |
1660 | ||
1661 | return ret; | |
1662 | } | |
1663 | ||
e2ebc74d JB |
1664 | /* helper functions for pending packets for when queues are stopped */ |
1665 | ||
1666 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) | |
1667 | { | |
1668 | int i, j; | |
1669 | struct ieee80211_tx_stored_packet *store; | |
1670 | ||
1671 | for (i = 0; i < local->hw.queues; i++) { | |
1672 | if (!__ieee80211_queue_pending(local, i)) | |
1673 | continue; | |
1674 | store = &local->pending_packet[i]; | |
1675 | kfree_skb(store->skb); | |
1676 | for (j = 0; j < store->num_extra_frag; j++) | |
1677 | kfree_skb(store->extra_frag[j]); | |
1678 | kfree(store->extra_frag); | |
1679 | clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]); | |
1680 | } | |
1681 | } | |
1682 | ||
1683 | void ieee80211_tx_pending(unsigned long data) | |
1684 | { | |
1685 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1686 | struct net_device *dev = local->mdev; | |
1687 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1688 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
1689 | int i, ret, reschedule = 0; |
1690 | ||
1691 | netif_tx_lock_bh(dev); | |
1692 | for (i = 0; i < local->hw.queues; i++) { | |
1693 | if (__ieee80211_queue_stopped(local, i)) | |
1694 | continue; | |
1695 | if (!__ieee80211_queue_pending(local, i)) { | |
1696 | reschedule = 1; | |
1697 | continue; | |
1698 | } | |
1699 | store = &local->pending_packet[i]; | |
5cf121c3 JB |
1700 | tx.extra_frag = store->extra_frag; |
1701 | tx.num_extra_frag = store->num_extra_frag; | |
2e92e6f2 | 1702 | tx.last_frag_rate_idx = store->last_frag_rate_idx; |
badffb72 JS |
1703 | tx.flags = 0; |
1704 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1705 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1706 | ret = __ieee80211_tx(local, store->skb, &tx); |
1707 | if (ret) { | |
1708 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1709 | store->skb = NULL; | |
1710 | } else { | |
1711 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1712 | &local->state[i]); | |
1713 | reschedule = 1; | |
1714 | } | |
1715 | } | |
1716 | netif_tx_unlock_bh(dev); | |
1717 | if (reschedule) { | |
1718 | if (!ieee80211_qdisc_installed(dev)) { | |
1719 | if (!__ieee80211_queue_stopped(local, 0)) | |
1720 | netif_wake_queue(dev); | |
1721 | } else | |
1722 | netif_schedule(dev); | |
1723 | } | |
1724 | } | |
1725 | ||
1726 | /* functions for drivers to get certain frames */ | |
1727 | ||
1728 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1729 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1730 | struct sk_buff *skb, |
1731 | struct beacon_data *beacon) | |
e2ebc74d JB |
1732 | { |
1733 | u8 *pos, *tim; | |
1734 | int aid0 = 0; | |
1735 | int i, have_bits = 0, n1, n2; | |
1736 | ||
1737 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1738 | * mode. */ | |
e2ebc74d JB |
1739 | if (atomic_read(&bss->num_sta_ps) > 0) |
1740 | /* in the hope that this is faster than | |
1741 | * checking byte-for-byte */ | |
1742 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1743 | IEEE80211_MAX_AID+1); | |
1744 | ||
1745 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1746 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1747 | else |
1748 | bss->dtim_count--; | |
1749 | ||
1750 | tim = pos = (u8 *) skb_put(skb, 6); | |
1751 | *pos++ = WLAN_EID_TIM; | |
1752 | *pos++ = 4; | |
1753 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1754 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1755 | |
1756 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1757 | aid0 = 1; | |
1758 | ||
1759 | if (have_bits) { | |
1760 | /* Find largest even number N1 so that bits numbered 1 through | |
1761 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1762 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1763 | n1 = 0; | |
1764 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1765 | if (bss->tim[i]) { | |
1766 | n1 = i & 0xfe; | |
1767 | break; | |
1768 | } | |
1769 | } | |
1770 | n2 = n1; | |
1771 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1772 | if (bss->tim[i]) { | |
1773 | n2 = i; | |
1774 | break; | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | /* Bitmap control */ | |
1779 | *pos++ = n1 | aid0; | |
1780 | /* Part Virt Bitmap */ | |
1781 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1782 | ||
1783 | tim[1] = n2 - n1 + 4; | |
1784 | skb_put(skb, n2 - n1); | |
1785 | } else { | |
1786 | *pos++ = aid0; /* Bitmap control */ | |
1787 | *pos++ = 0; /* Part Virt Bitmap */ | |
1788 | } | |
e2ebc74d JB |
1789 | } |
1790 | ||
32bfd35d | 1791 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1792 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1793 | { |
1794 | struct ieee80211_local *local = hw_to_local(hw); | |
1795 | struct sk_buff *skb; | |
e039fa4a | 1796 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1797 | struct net_device *bdev; |
1798 | struct ieee80211_sub_if_data *sdata = NULL; | |
1799 | struct ieee80211_if_ap *ap = NULL; | |
1abbe498 | 1800 | struct rate_selection rsel; |
5dfdaf58 | 1801 | struct beacon_data *beacon; |
8318d78a | 1802 | struct ieee80211_supported_band *sband; |
902acc78 | 1803 | struct ieee80211_mgmt *mgmt; |
33b64eb2 | 1804 | int *num_beacons; |
902acc78 | 1805 | bool err = true; |
2e92e6f2 | 1806 | enum ieee80211_band band = local->hw.conf.channel->band; |
902acc78 | 1807 | u8 *pos; |
8318d78a | 1808 | |
2e92e6f2 | 1809 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1810 | |
1811 | rcu_read_lock(); | |
e2ebc74d | 1812 | |
32bfd35d JB |
1813 | sdata = vif_to_sdata(vif); |
1814 | bdev = sdata->dev; | |
e2ebc74d | 1815 | |
902acc78 | 1816 | if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
33b64eb2 LCC |
1817 | ap = &sdata->u.ap; |
1818 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1819 | if (ap && beacon) { |
1820 | /* | |
1821 | * headroom, head length, | |
1822 | * tail length and maximum TIM length | |
1823 | */ | |
1824 | skb = dev_alloc_skb(local->tx_headroom + | |
1825 | beacon->head_len + | |
1826 | beacon->tail_len + 256); | |
1827 | if (!skb) | |
1828 | goto out; | |
33b64eb2 | 1829 | |
902acc78 JB |
1830 | skb_reserve(skb, local->tx_headroom); |
1831 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1832 | beacon->head_len); | |
33b64eb2 | 1833 | |
902acc78 JB |
1834 | ieee80211_include_sequence(sdata, |
1835 | (struct ieee80211_hdr *)skb->data); | |
33b64eb2 | 1836 | |
d0709a65 JB |
1837 | /* |
1838 | * Not very nice, but we want to allow the driver to call | |
1839 | * ieee80211_beacon_get() as a response to the set_tim() | |
1840 | * callback. That, however, is already invoked under the | |
1841 | * sta_lock to guarantee consistent and race-free update | |
1842 | * of the tim bitmap in mac80211 and the driver. | |
1843 | */ | |
1844 | if (local->tim_in_locked_section) { | |
1845 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1846 | } else { | |
1847 | unsigned long flags; | |
1848 | ||
1849 | spin_lock_irqsave(&local->sta_lock, flags); | |
1850 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1851 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1852 | } | |
33b64eb2 | 1853 | |
902acc78 JB |
1854 | if (beacon->tail) |
1855 | memcpy(skb_put(skb, beacon->tail_len), | |
1856 | beacon->tail, beacon->tail_len); | |
33b64eb2 | 1857 | |
902acc78 | 1858 | num_beacons = &ap->num_beacons; |
33b64eb2 | 1859 | |
902acc78 JB |
1860 | err = false; |
1861 | } | |
1862 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
1863 | /* headroom, head length, tail length and maximum TIM length */ | |
1864 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1865 | if (!skb) | |
1866 | goto out; | |
1867 | ||
1868 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1869 | mgmt = (struct ieee80211_mgmt *) | |
1870 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1871 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
1872 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
1873 | IEEE80211_STYPE_BEACON); | |
1874 | memset(mgmt->da, 0xff, ETH_ALEN); | |
1875 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1876 | /* BSSID is left zeroed, wildcard value */ | |
1877 | mgmt->u.beacon.beacon_int = | |
1878 | cpu_to_le16(local->hw.conf.beacon_int); | |
1879 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1880 | ||
1881 | pos = skb_put(skb, 2); | |
1882 | *pos++ = WLAN_EID_SSID; | |
1883 | *pos++ = 0x0; | |
1884 | ||
1885 | mesh_mgmt_ies_add(skb, sdata->dev); | |
33b64eb2 | 1886 | |
33b64eb2 | 1887 | num_beacons = &sdata->u.sta.num_beacons; |
33b64eb2 | 1888 | |
902acc78 | 1889 | err = false; |
33b64eb2 | 1890 | } |
5dfdaf58 | 1891 | |
33b64eb2 | 1892 | if (err) { |
e2ebc74d JB |
1893 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1894 | if (net_ratelimit()) | |
32bfd35d JB |
1895 | printk(KERN_DEBUG "no beacon data avail for %s\n", |
1896 | bdev->name); | |
e2ebc74d | 1897 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
5dfdaf58 JB |
1898 | skb = NULL; |
1899 | goto out; | |
e2ebc74d JB |
1900 | } |
1901 | ||
e039fa4a JB |
1902 | info = IEEE80211_SKB_CB(skb); |
1903 | ||
1904 | info->band = band; | |
1905 | rate_control_get_rate(local->mdev, sband, skb, &rsel); | |
e2ebc74d | 1906 | |
e039fa4a JB |
1907 | if (unlikely(rsel.rate_idx < 0)) { |
1908 | if (net_ratelimit()) { | |
1909 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " | |
1910 | "no rate found\n", | |
1911 | wiphy_name(local->hw.wiphy)); | |
1912 | } | |
1913 | dev_kfree_skb(skb); | |
1914 | skb = NULL; | |
1915 | goto out; | |
e2ebc74d | 1916 | } |
e039fa4a JB |
1917 | |
1918 | info->control.vif = vif; | |
1919 | info->tx_rate_idx = rsel.rate_idx; | |
1920 | if (sdata->bss_conf.use_short_preamble && | |
1921 | sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1922 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; | |
1923 | info->antenna_sel_tx = local->hw.conf.antenna_sel_tx; | |
1924 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1925 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; | |
1926 | info->control.retry_limit = 1; | |
1927 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; | |
33b64eb2 LCC |
1928 | (*num_beacons)++; |
1929 | out: | |
5dfdaf58 | 1930 | rcu_read_unlock(); |
e2ebc74d JB |
1931 | return skb; |
1932 | } | |
1933 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1934 | ||
32bfd35d | 1935 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1936 | const void *frame, size_t frame_len, |
e039fa4a | 1937 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1938 | struct ieee80211_rts *rts) |
1939 | { | |
1940 | const struct ieee80211_hdr *hdr = frame; | |
1941 | u16 fctl; | |
1942 | ||
1943 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS; | |
1944 | rts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1945 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1946 | frame_txctl); | |
e2ebc74d JB |
1947 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1948 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1949 | } | |
1950 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1951 | ||
32bfd35d | 1952 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1953 | const void *frame, size_t frame_len, |
e039fa4a | 1954 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1955 | struct ieee80211_cts *cts) |
1956 | { | |
1957 | const struct ieee80211_hdr *hdr = frame; | |
1958 | u16 fctl; | |
1959 | ||
1960 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS; | |
1961 | cts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1962 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1963 | frame_len, frame_txctl); | |
e2ebc74d JB |
1964 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1965 | } | |
1966 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1967 | ||
1968 | struct sk_buff * | |
32bfd35d | 1969 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 1970 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1971 | { |
1972 | struct ieee80211_local *local = hw_to_local(hw); | |
1973 | struct sk_buff *skb; | |
1974 | struct sta_info *sta; | |
1975 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1976 | struct ieee80211_tx_data tx; |
9ae54c84 | 1977 | ieee80211_tx_result res = TX_DROP; |
e2ebc74d JB |
1978 | struct net_device *bdev; |
1979 | struct ieee80211_sub_if_data *sdata; | |
1980 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 1981 | struct beacon_data *beacon; |
e039fa4a | 1982 | struct ieee80211_tx_info *info; |
e2ebc74d | 1983 | |
32bfd35d JB |
1984 | sdata = vif_to_sdata(vif); |
1985 | bdev = sdata->dev; | |
1986 | ||
5dfdaf58 JB |
1987 | |
1988 | if (!bss) | |
e2ebc74d JB |
1989 | return NULL; |
1990 | ||
5dfdaf58 JB |
1991 | rcu_read_lock(); |
1992 | beacon = rcu_dereference(bss->beacon); | |
1993 | ||
1994 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || | |
1995 | !beacon->head) { | |
1996 | rcu_read_unlock(); | |
1997 | return NULL; | |
1998 | } | |
5dfdaf58 | 1999 | |
e2ebc74d JB |
2000 | if (bss->dtim_count != 0) |
2001 | return NULL; /* send buffered bc/mc only after DTIM beacon */ | |
e039fa4a | 2002 | |
e2ebc74d JB |
2003 | while (1) { |
2004 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2005 | if (!skb) | |
2006 | return NULL; | |
2007 | local->total_ps_buffered--; | |
2008 | ||
2009 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2010 | struct ieee80211_hdr *hdr = | |
2011 | (struct ieee80211_hdr *) skb->data; | |
2012 | /* more buffered multicast/broadcast frames ==> set | |
2013 | * MoreData flag in IEEE 802.11 header to inform PS | |
2014 | * STAs */ | |
2015 | hdr->frame_control |= | |
2016 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2017 | } | |
2018 | ||
e039fa4a | 2019 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev)) |
e2ebc74d JB |
2020 | break; |
2021 | dev_kfree_skb_any(skb); | |
2022 | } | |
e039fa4a JB |
2023 | |
2024 | info = IEEE80211_SKB_CB(skb); | |
2025 | ||
e2ebc74d | 2026 | sta = tx.sta; |
5cf121c3 JB |
2027 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2028 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2029 | info->band = tx.channel->band; |
e2ebc74d | 2030 | |
58905290 | 2031 | for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) { |
e2ebc74d | 2032 | res = (*handler)(&tx); |
9ae54c84 | 2033 | if (res == TX_DROP || res == TX_QUEUED) |
e2ebc74d JB |
2034 | break; |
2035 | } | |
e039fa4a JB |
2036 | |
2037 | if (WARN_ON(tx.skb != skb)) | |
2038 | return NULL; | |
e2ebc74d | 2039 | |
9ae54c84 | 2040 | if (res == TX_DROP) { |
e2ebc74d JB |
2041 | I802_DEBUG_INC(local->tx_handlers_drop); |
2042 | dev_kfree_skb(skb); | |
2043 | skb = NULL; | |
9ae54c84 | 2044 | } else if (res == TX_QUEUED) { |
e2ebc74d JB |
2045 | I802_DEBUG_INC(local->tx_handlers_queued); |
2046 | skb = NULL; | |
2047 | } | |
2048 | ||
d0709a65 | 2049 | rcu_read_unlock(); |
e2ebc74d JB |
2050 | |
2051 | return skb; | |
2052 | } | |
2053 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |