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 | |
241 | struct sk_buff *skb = tx->skb; | |
242 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
243 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
244 | u32 sta_flags; | |
245 | ||
5cf121c3 | 246 | if (unlikely(tx->flags & IEEE80211_TX_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 | { |
7d54d0dd JB |
351 | /* |
352 | * broadcast/multicast frame | |
353 | * | |
354 | * If any of the associated stations is in power save mode, | |
355 | * the frame is buffered to be sent after DTIM beacon frame. | |
356 | * This is done either by the hardware or us. | |
357 | */ | |
358 | ||
359 | /* not AP/IBSS or ordered frame */ | |
360 | if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER)) | |
9ae54c84 | 361 | return TX_CONTINUE; |
7d54d0dd JB |
362 | |
363 | /* no stations in PS mode */ | |
364 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 365 | return TX_CONTINUE; |
7d54d0dd JB |
366 | |
367 | /* buffered in mac80211 */ | |
368 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
369 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
370 | purge_old_ps_buffers(tx->local); | |
371 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
372 | AP_MAX_BC_BUFFER) { | |
373 | if (net_ratelimit()) { | |
374 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
375 | "dropping the oldest frame\n", | |
376 | tx->dev->name); | |
377 | } | |
378 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); | |
379 | } else | |
380 | tx->local->total_ps_buffered++; | |
381 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 382 | return TX_QUEUED; |
e2ebc74d JB |
383 | } |
384 | ||
7d54d0dd | 385 | /* buffered in hardware */ |
5cf121c3 | 386 | tx->control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM; |
7d54d0dd | 387 | |
9ae54c84 | 388 | return TX_CONTINUE; |
e2ebc74d JB |
389 | } |
390 | ||
9ae54c84 | 391 | static ieee80211_tx_result |
5cf121c3 | 392 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
393 | { |
394 | struct sta_info *sta = tx->sta; | |
07346f81 | 395 | u32 staflags; |
0795af57 | 396 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
397 | |
398 | if (unlikely(!sta || | |
399 | ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && | |
400 | (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) | |
9ae54c84 | 401 | return TX_CONTINUE; |
e2ebc74d | 402 | |
07346f81 JB |
403 | staflags = get_sta_flags(sta); |
404 | ||
405 | if (unlikely((staflags & WLAN_STA_PS) && | |
406 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d JB |
407 | struct ieee80211_tx_packet_data *pkt_data; |
408 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 409 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 410 | "before %d)\n", |
0795af57 | 411 | print_mac(mac, sta->addr), sta->aid, |
e2ebc74d JB |
412 | skb_queue_len(&sta->ps_tx_buf)); |
413 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
414 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
415 | purge_old_ps_buffers(tx->local); | |
416 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
417 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
418 | if (net_ratelimit()) { | |
0795af57 | 419 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 420 | "buffer full - dropping oldest frame\n", |
0795af57 | 421 | tx->dev->name, print_mac(mac, sta->addr)); |
e2ebc74d JB |
422 | } |
423 | dev_kfree_skb(old); | |
424 | } else | |
425 | tx->local->total_ps_buffered++; | |
004c872e | 426 | |
e2ebc74d | 427 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
428 | if (skb_queue_empty(&sta->ps_tx_buf)) |
429 | sta_info_set_tim_bit(sta); | |
430 | ||
e2ebc74d JB |
431 | pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb; |
432 | pkt_data->jiffies = jiffies; | |
433 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); | |
9ae54c84 | 434 | return TX_QUEUED; |
e2ebc74d JB |
435 | } |
436 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 437 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0795af57 | 438 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 439 | "set -> send frame\n", tx->dev->name, |
0795af57 | 440 | print_mac(mac, sta->addr)); |
e2ebc74d JB |
441 | } |
442 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 443 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 444 | |
9ae54c84 | 445 | return TX_CONTINUE; |
e2ebc74d JB |
446 | } |
447 | ||
9ae54c84 | 448 | static ieee80211_tx_result |
5cf121c3 | 449 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 450 | { |
5cf121c3 | 451 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 452 | return TX_CONTINUE; |
e2ebc74d | 453 | |
5cf121c3 | 454 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
455 | return ieee80211_tx_h_unicast_ps_buf(tx); |
456 | else | |
457 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
458 | } | |
459 | ||
9ae54c84 | 460 | static ieee80211_tx_result |
5cf121c3 | 461 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 462 | { |
d4e46a3d | 463 | struct ieee80211_key *key; |
176e4f84 | 464 | u16 fc = tx->fc; |
d4e46a3d | 465 | |
5cf121c3 | 466 | if (unlikely(tx->control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)) |
e2ebc74d | 467 | tx->key = NULL; |
d4e46a3d JB |
468 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
469 | tx->key = key; | |
470 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
471 | tx->key = key; | |
e2ebc74d | 472 | else if (tx->sdata->drop_unencrypted && |
5cf121c3 JB |
473 | !(tx->control->flags & IEEE80211_TXCTL_EAPOL_FRAME) && |
474 | !(tx->flags & IEEE80211_TX_INJECTED)) { | |
e2ebc74d | 475 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 476 | return TX_DROP; |
176e4f84 | 477 | } else |
e2ebc74d JB |
478 | tx->key = NULL; |
479 | ||
480 | if (tx->key) { | |
176e4f84 JB |
481 | u16 ftype, stype; |
482 | ||
e2ebc74d | 483 | tx->key->tx_rx_count++; |
011bfcc4 | 484 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
485 | |
486 | switch (tx->key->conf.alg) { | |
487 | case ALG_WEP: | |
488 | ftype = fc & IEEE80211_FCTL_FTYPE; | |
489 | stype = fc & IEEE80211_FCTL_STYPE; | |
490 | ||
491 | if (ftype == IEEE80211_FTYPE_MGMT && | |
492 | stype == IEEE80211_STYPE_AUTH) | |
493 | break; | |
494 | case ALG_TKIP: | |
495 | case ALG_CCMP: | |
496 | if (!WLAN_FC_DATA_PRESENT(fc)) | |
497 | tx->key = NULL; | |
498 | break; | |
499 | } | |
e2ebc74d JB |
500 | } |
501 | ||
176e4f84 | 502 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
5cf121c3 | 503 | tx->control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
176e4f84 | 504 | |
9ae54c84 | 505 | return TX_CONTINUE; |
e2ebc74d JB |
506 | } |
507 | ||
9ae54c84 | 508 | static ieee80211_tx_result |
5cf121c3 | 509 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
510 | { |
511 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
512 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; | |
513 | struct sk_buff **frags, *first, *frag; | |
514 | int i; | |
515 | u16 seq; | |
516 | u8 *pos; | |
517 | int frag_threshold = tx->local->fragmentation_threshold; | |
518 | ||
5cf121c3 | 519 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) |
9ae54c84 | 520 | return TX_CONTINUE; |
e2ebc74d JB |
521 | |
522 | first = tx->skb; | |
523 | ||
524 | hdrlen = ieee80211_get_hdrlen(tx->fc); | |
525 | payload_len = first->len - hdrlen; | |
526 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
172589cc | 527 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); |
e2ebc74d JB |
528 | |
529 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
530 | if (!frags) | |
531 | goto fail; | |
532 | ||
533 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
534 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
535 | pos = first->data + hdrlen + per_fragm; | |
536 | left = payload_len - per_fragm; | |
537 | for (i = 0; i < num_fragm - 1; i++) { | |
538 | struct ieee80211_hdr *fhdr; | |
539 | size_t copylen; | |
540 | ||
541 | if (left <= 0) | |
542 | goto fail; | |
543 | ||
544 | /* reserve enough extra head and tail room for possible | |
545 | * encryption */ | |
546 | frag = frags[i] = | |
547 | dev_alloc_skb(tx->local->tx_headroom + | |
548 | frag_threshold + | |
549 | IEEE80211_ENCRYPT_HEADROOM + | |
550 | IEEE80211_ENCRYPT_TAILROOM); | |
551 | if (!frag) | |
552 | goto fail; | |
553 | /* Make sure that all fragments use the same priority so | |
554 | * that they end up using the same TX queue */ | |
555 | frag->priority = first->priority; | |
556 | skb_reserve(frag, tx->local->tx_headroom + | |
557 | IEEE80211_ENCRYPT_HEADROOM); | |
558 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
559 | memcpy(fhdr, first->data, hdrlen); | |
560 | if (i == num_fragm - 2) | |
561 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
562 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
563 | copylen = left > per_fragm ? per_fragm : left; | |
564 | memcpy(skb_put(frag, copylen), pos, copylen); | |
565 | ||
566 | pos += copylen; | |
567 | left -= copylen; | |
568 | } | |
569 | skb_trim(first, hdrlen + per_fragm); | |
570 | ||
5cf121c3 JB |
571 | tx->num_extra_frag = num_fragm - 1; |
572 | tx->extra_frag = frags; | |
e2ebc74d | 573 | |
9ae54c84 | 574 | return TX_CONTINUE; |
e2ebc74d JB |
575 | |
576 | fail: | |
577 | printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); | |
578 | if (frags) { | |
579 | for (i = 0; i < num_fragm - 1; i++) | |
580 | if (frags[i]) | |
581 | dev_kfree_skb(frags[i]); | |
582 | kfree(frags); | |
583 | } | |
584 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
9ae54c84 | 585 | return TX_DROP; |
e2ebc74d JB |
586 | } |
587 | ||
9ae54c84 | 588 | static ieee80211_tx_result |
5cf121c3 | 589 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
e2ebc74d | 590 | { |
6a22a59d | 591 | if (!tx->key) |
9ae54c84 | 592 | return TX_CONTINUE; |
e2ebc74d | 593 | |
6a22a59d JB |
594 | switch (tx->key->conf.alg) { |
595 | case ALG_WEP: | |
596 | return ieee80211_crypto_wep_encrypt(tx); | |
597 | case ALG_TKIP: | |
598 | return ieee80211_crypto_tkip_encrypt(tx); | |
599 | case ALG_CCMP: | |
600 | return ieee80211_crypto_ccmp_encrypt(tx); | |
e2ebc74d JB |
601 | } |
602 | ||
6a22a59d JB |
603 | /* not reached */ |
604 | WARN_ON(1); | |
9ae54c84 | 605 | return TX_DROP; |
e2ebc74d JB |
606 | } |
607 | ||
9ae54c84 | 608 | static ieee80211_tx_result |
5cf121c3 | 609 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 610 | { |
1abbe498 | 611 | struct rate_selection rsel; |
8318d78a JB |
612 | struct ieee80211_supported_band *sband; |
613 | ||
2e92e6f2 | 614 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d | 615 | |
2e92e6f2 | 616 | if (likely(tx->rate_idx < 0)) { |
8318d78a | 617 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
2e92e6f2 JB |
618 | tx->rate_idx = rsel.rate_idx; |
619 | if (unlikely(rsel.probe_idx >= 0)) { | |
5cf121c3 | 620 | tx->control->flags |= |
58d4185e | 621 | IEEE80211_TXCTL_RATE_CTRL_PROBE; |
5cf121c3 | 622 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
2e92e6f2 JB |
623 | tx->control->alt_retry_rate_idx = tx->rate_idx; |
624 | tx->rate_idx = rsel.probe_idx; | |
58d4185e | 625 | } else |
2e92e6f2 | 626 | tx->control->alt_retry_rate_idx = -1; |
58d4185e | 627 | |
2e92e6f2 | 628 | if (unlikely(tx->rate_idx < 0)) |
9ae54c84 | 629 | return TX_DROP; |
58d4185e | 630 | } else |
2e92e6f2 | 631 | tx->control->alt_retry_rate_idx = -1; |
58d4185e | 632 | |
8318d78a | 633 | if (tx->sdata->bss_conf.use_cts_prot && |
2e92e6f2 JB |
634 | (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) { |
635 | tx->last_frag_rate_idx = tx->rate_idx; | |
636 | if (rsel.probe_idx >= 0) | |
5cf121c3 | 637 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 638 | else |
5cf121c3 | 639 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
2e92e6f2 JB |
640 | tx->rate_idx = rsel.nonerp_idx; |
641 | tx->control->tx_rate_idx = rsel.nonerp_idx; | |
5cf121c3 | 642 | tx->control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE; |
e2ebc74d | 643 | } else { |
2e92e6f2 JB |
644 | tx->last_frag_rate_idx = tx->rate_idx; |
645 | tx->control->tx_rate_idx = tx->rate_idx; | |
e2ebc74d | 646 | } |
2e92e6f2 | 647 | tx->control->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 648 | |
9ae54c84 | 649 | return TX_CONTINUE; |
e2ebc74d JB |
650 | } |
651 | ||
9ae54c84 | 652 | static ieee80211_tx_result |
5cf121c3 | 653 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
654 | { |
655 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
7e9ed188 | 656 | u16 fc = le16_to_cpu(hdr->frame_control); |
e2ebc74d | 657 | u16 dur; |
5cf121c3 | 658 | struct ieee80211_tx_control *control = tx->control; |
2e92e6f2 JB |
659 | struct ieee80211_supported_band *sband; |
660 | ||
661 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
e2ebc74d | 662 | |
58d4185e JB |
663 | if (!control->retry_limit) { |
664 | if (!is_multicast_ether_addr(hdr->addr1)) { | |
665 | if (tx->skb->len + FCS_LEN > tx->local->rts_threshold | |
666 | && tx->local->rts_threshold < | |
667 | IEEE80211_MAX_RTS_THRESHOLD) { | |
668 | control->flags |= | |
669 | IEEE80211_TXCTL_USE_RTS_CTS; | |
670 | control->flags |= | |
671 | IEEE80211_TXCTL_LONG_RETRY_LIMIT; | |
672 | control->retry_limit = | |
673 | tx->local->long_retry_limit; | |
674 | } else { | |
675 | control->retry_limit = | |
676 | tx->local->short_retry_limit; | |
677 | } | |
e2ebc74d | 678 | } else { |
58d4185e | 679 | control->retry_limit = 1; |
e2ebc74d | 680 | } |
e2ebc74d JB |
681 | } |
682 | ||
5cf121c3 | 683 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
684 | /* Do not use multiple retry rates when sending fragmented |
685 | * frames. | |
686 | * TODO: The last fragment could still use multiple retry | |
687 | * rates. */ | |
2e92e6f2 | 688 | control->alt_retry_rate_idx = -1; |
e2ebc74d JB |
689 | } |
690 | ||
691 | /* Use CTS protection for unicast frames sent using extended rates if | |
692 | * there are associated non-ERP stations and RTS/CTS is not configured | |
693 | * for the frame. */ | |
8318d78a | 694 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
2e92e6f2 | 695 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) && |
5cf121c3 | 696 | (tx->flags & IEEE80211_TX_UNICAST) && |
471b3efd | 697 | tx->sdata->bss_conf.use_cts_prot && |
e2ebc74d JB |
698 | !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS)) |
699 | control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT; | |
700 | ||
7e9ed188 DD |
701 | /* Transmit data frames using short preambles if the driver supports |
702 | * short preambles at the selected rate and short preambles are | |
703 | * available on the network at the current point in time. */ | |
704 | if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
2e92e6f2 | 705 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 706 | tx->sdata->bss_conf.use_short_preamble && |
07346f81 | 707 | (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) { |
5cf121c3 | 708 | tx->control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE; |
7e9ed188 DD |
709 | } |
710 | ||
e2ebc74d JB |
711 | /* Setup duration field for the first fragment of the frame. Duration |
712 | * for remaining fragments will be updated when they are being sent | |
713 | * to low-level driver in ieee80211_tx(). */ | |
714 | dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1), | |
5cf121c3 JB |
715 | (tx->flags & IEEE80211_TX_FRAGMENTED) ? |
716 | tx->extra_frag[0]->len : 0); | |
e2ebc74d JB |
717 | hdr->duration_id = cpu_to_le16(dur); |
718 | ||
719 | if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) || | |
720 | (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) { | |
8318d78a | 721 | struct ieee80211_supported_band *sband; |
2e92e6f2 JB |
722 | struct ieee80211_rate *rate; |
723 | s8 baserate = -1; | |
8318d78a JB |
724 | int idx; |
725 | ||
2e92e6f2 | 726 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d JB |
727 | |
728 | /* Do not use multiple retry rates when using RTS/CTS */ | |
2e92e6f2 | 729 | control->alt_retry_rate_idx = -1; |
e2ebc74d JB |
730 | |
731 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
2e92e6f2 | 732 | rate = &sband->bitrates[tx->rate_idx]; |
8318d78a JB |
733 | |
734 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
735 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
736 | continue; | |
737 | if (tx->sdata->basic_rates & BIT(idx) && | |
2e92e6f2 JB |
738 | (baserate < 0 || |
739 | (sband->bitrates[baserate].bitrate | |
740 | < sband->bitrates[idx].bitrate))) | |
741 | baserate = idx; | |
8318d78a | 742 | } |
e2ebc74d | 743 | |
2e92e6f2 JB |
744 | if (baserate >= 0) |
745 | control->rts_cts_rate_idx = baserate; | |
8318d78a | 746 | else |
2e92e6f2 | 747 | control->rts_cts_rate_idx = 0; |
e2ebc74d JB |
748 | } |
749 | ||
750 | if (tx->sta) { | |
fff77109 | 751 | control->aid = tx->sta->aid; |
e2ebc74d JB |
752 | tx->sta->tx_packets++; |
753 | tx->sta->tx_fragments++; | |
754 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 755 | if (tx->extra_frag) { |
e2ebc74d | 756 | int i; |
5cf121c3 JB |
757 | tx->sta->tx_fragments += tx->num_extra_frag; |
758 | for (i = 0; i < tx->num_extra_frag; i++) { | |
e2ebc74d | 759 | tx->sta->tx_bytes += |
5cf121c3 | 760 | tx->extra_frag[i]->len; |
e2ebc74d JB |
761 | } |
762 | } | |
763 | } | |
764 | ||
9ae54c84 | 765 | return TX_CONTINUE; |
e2ebc74d JB |
766 | } |
767 | ||
9ae54c84 | 768 | static ieee80211_tx_result |
5cf121c3 | 769 | ieee80211_tx_h_load_stats(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
770 | { |
771 | struct ieee80211_local *local = tx->local; | |
e2ebc74d JB |
772 | struct sk_buff *skb = tx->skb; |
773 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
774 | u32 load = 0, hdrtime; | |
2e92e6f2 JB |
775 | struct ieee80211_rate *rate; |
776 | struct ieee80211_supported_band *sband; | |
777 | ||
778 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
779 | rate = &sband->bitrates[tx->rate_idx]; | |
e2ebc74d JB |
780 | |
781 | /* TODO: this could be part of tx_status handling, so that the number | |
782 | * of retries would be known; TX rate should in that case be stored | |
783 | * somewhere with the packet */ | |
784 | ||
785 | /* Estimate total channel use caused by this frame */ | |
786 | ||
787 | /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, | |
788 | * 1 usec = 1/8 * (1080 / 10) = 13.5 */ | |
789 | ||
5cf121c3 JB |
790 | if (tx->channel->band == IEEE80211_BAND_5GHZ || |
791 | (tx->channel->band == IEEE80211_BAND_2GHZ && | |
8318d78a | 792 | rate->flags & IEEE80211_RATE_ERP_G)) |
e2ebc74d JB |
793 | hdrtime = CHAN_UTIL_HDR_SHORT; |
794 | else | |
795 | hdrtime = CHAN_UTIL_HDR_LONG; | |
796 | ||
797 | load = hdrtime; | |
798 | if (!is_multicast_ether_addr(hdr->addr1)) | |
799 | load += hdrtime; | |
800 | ||
5cf121c3 | 801 | if (tx->control->flags & IEEE80211_TXCTL_USE_RTS_CTS) |
e2ebc74d | 802 | load += 2 * hdrtime; |
5cf121c3 | 803 | else if (tx->control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) |
e2ebc74d JB |
804 | load += hdrtime; |
805 | ||
8318d78a JB |
806 | /* TODO: optimise again */ |
807 | load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate; | |
e2ebc74d | 808 | |
5cf121c3 | 809 | if (tx->extra_frag) { |
e2ebc74d | 810 | int i; |
5cf121c3 | 811 | for (i = 0; i < tx->num_extra_frag; i++) { |
e2ebc74d | 812 | load += 2 * hdrtime; |
5cf121c3 | 813 | load += tx->extra_frag[i]->len * |
2e92e6f2 | 814 | rate->bitrate; |
e2ebc74d JB |
815 | } |
816 | } | |
817 | ||
818 | /* Divide channel_use by 8 to avoid wrapping around the counter */ | |
819 | load >>= CHAN_UTIL_SHIFT; | |
820 | local->channel_use_raw += load; | |
821 | if (tx->sta) | |
822 | tx->sta->channel_use_raw += load; | |
823 | tx->sdata->channel_use_raw += load; | |
824 | ||
9ae54c84 | 825 | return TX_CONTINUE; |
e2ebc74d JB |
826 | } |
827 | ||
e2ebc74d | 828 | |
5cf121c3 | 829 | typedef ieee80211_tx_result (*ieee80211_tx_handler)(struct ieee80211_tx_data *); |
58905290 | 830 | static ieee80211_tx_handler ieee80211_tx_handlers[] = |
e2ebc74d JB |
831 | { |
832 | ieee80211_tx_h_check_assoc, | |
833 | ieee80211_tx_h_sequence, | |
834 | ieee80211_tx_h_ps_buf, | |
835 | ieee80211_tx_h_select_key, | |
836 | ieee80211_tx_h_michael_mic_add, | |
837 | ieee80211_tx_h_fragment, | |
6a22a59d | 838 | ieee80211_tx_h_encrypt, |
e2ebc74d JB |
839 | ieee80211_tx_h_rate_ctrl, |
840 | ieee80211_tx_h_misc, | |
841 | ieee80211_tx_h_load_stats, | |
842 | NULL | |
843 | }; | |
844 | ||
845 | /* actual transmit path */ | |
846 | ||
847 | /* | |
848 | * deal with packet injection down monitor interface | |
849 | * with Radiotap Header -- only called for monitor mode interface | |
850 | */ | |
9ae54c84 | 851 | static ieee80211_tx_result |
5cf121c3 | 852 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 853 | struct sk_buff *skb) |
e2ebc74d JB |
854 | { |
855 | /* | |
856 | * this is the moment to interpret and discard the radiotap header that | |
857 | * must be at the start of the packet injected in Monitor mode | |
858 | * | |
859 | * Need to take some care with endian-ness since radiotap | |
860 | * args are little-endian | |
861 | */ | |
862 | ||
863 | struct ieee80211_radiotap_iterator iterator; | |
864 | struct ieee80211_radiotap_header *rthdr = | |
865 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 866 | struct ieee80211_supported_band *sband; |
e2ebc74d | 867 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
5cf121c3 | 868 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d | 869 | |
2e92e6f2 | 870 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 871 | |
58d4185e | 872 | control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
5cf121c3 JB |
873 | tx->flags |= IEEE80211_TX_INJECTED; |
874 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; | |
e2ebc74d JB |
875 | |
876 | /* | |
877 | * for every radiotap entry that is present | |
878 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
879 | * entries present, or -EINVAL on error) | |
880 | */ | |
881 | ||
882 | while (!ret) { | |
883 | int i, target_rate; | |
884 | ||
885 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
886 | ||
887 | if (ret) | |
888 | continue; | |
889 | ||
890 | /* see if this argument is something we can use */ | |
891 | switch (iterator.this_arg_index) { | |
892 | /* | |
893 | * You must take care when dereferencing iterator.this_arg | |
894 | * for multibyte types... the pointer is not aligned. Use | |
895 | * get_unaligned((type *)iterator.this_arg) to dereference | |
896 | * iterator.this_arg for type "type" safely on all arches. | |
897 | */ | |
898 | case IEEE80211_RADIOTAP_RATE: | |
899 | /* | |
900 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
901 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
902 | */ | |
903 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
904 | for (i = 0; i < sband->n_bitrates; i++) { |
905 | struct ieee80211_rate *r; | |
e2ebc74d | 906 | |
8318d78a JB |
907 | r = &sband->bitrates[i]; |
908 | ||
909 | if (r->bitrate == target_rate) { | |
2e92e6f2 | 910 | tx->rate_idx = i; |
58d4185e JB |
911 | break; |
912 | } | |
e2ebc74d JB |
913 | } |
914 | break; | |
915 | ||
916 | case IEEE80211_RADIOTAP_ANTENNA: | |
917 | /* | |
918 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
919 | * 1st ant | |
920 | */ | |
921 | control->antenna_sel_tx = (*iterator.this_arg) + 1; | |
922 | break; | |
923 | ||
8318d78a | 924 | #if 0 |
e2ebc74d JB |
925 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
926 | control->power_level = *iterator.this_arg; | |
927 | break; | |
8318d78a | 928 | #endif |
e2ebc74d JB |
929 | |
930 | case IEEE80211_RADIOTAP_FLAGS: | |
931 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
932 | /* | |
933 | * this indicates that the skb we have been | |
934 | * handed has the 32-bit FCS CRC at the end... | |
935 | * we should react to that by snipping it off | |
936 | * because it will be recomputed and added | |
937 | * on transmission | |
938 | */ | |
939 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 940 | return TX_DROP; |
e2ebc74d JB |
941 | |
942 | skb_trim(skb, skb->len - FCS_LEN); | |
943 | } | |
58d4185e JB |
944 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
945 | control->flags &= | |
946 | ~IEEE80211_TXCTL_DO_NOT_ENCRYPT; | |
947 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) | |
5cf121c3 | 948 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
949 | break; |
950 | ||
58d4185e JB |
951 | /* |
952 | * Please update the file | |
953 | * Documentation/networking/mac80211-injection.txt | |
954 | * when parsing new fields here. | |
955 | */ | |
956 | ||
e2ebc74d JB |
957 | default: |
958 | break; | |
959 | } | |
960 | } | |
961 | ||
962 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 963 | return TX_DROP; |
e2ebc74d JB |
964 | |
965 | /* | |
966 | * remove the radiotap header | |
967 | * iterator->max_length was sanity-checked against | |
968 | * skb->len by iterator init | |
969 | */ | |
970 | skb_pull(skb, iterator.max_length); | |
971 | ||
9ae54c84 | 972 | return TX_CONTINUE; |
e2ebc74d JB |
973 | } |
974 | ||
58d4185e JB |
975 | /* |
976 | * initialises @tx | |
977 | */ | |
9ae54c84 | 978 | static ieee80211_tx_result |
5cf121c3 | 979 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d JB |
980 | struct sk_buff *skb, |
981 | struct net_device *dev, | |
982 | struct ieee80211_tx_control *control) | |
983 | { | |
984 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 985 | struct ieee80211_hdr *hdr; |
e2ebc74d | 986 | struct ieee80211_sub_if_data *sdata; |
e2ebc74d JB |
987 | |
988 | int hdrlen; | |
989 | ||
990 | memset(tx, 0, sizeof(*tx)); | |
991 | tx->skb = skb; | |
992 | tx->dev = dev; /* use original interface */ | |
993 | tx->local = local; | |
994 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
5cf121c3 | 995 | tx->control = control; |
e2ebc74d | 996 | /* |
58d4185e JB |
997 | * Set this flag (used below to indicate "automatic fragmentation"), |
998 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 999 | */ |
5cf121c3 | 1000 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1001 | |
1002 | /* process and remove the injection radiotap header */ | |
1003 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
51fb61e7 | 1004 | if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { |
9ae54c84 JB |
1005 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
1006 | return TX_DROP; | |
58d4185e | 1007 | |
e2ebc74d | 1008 | /* |
58d4185e JB |
1009 | * __ieee80211_parse_tx_radiotap has now removed |
1010 | * the radiotap header that was present and pre-filled | |
1011 | * 'tx' with tx control information. | |
e2ebc74d | 1012 | */ |
e2ebc74d JB |
1013 | } |
1014 | ||
58d4185e JB |
1015 | hdr = (struct ieee80211_hdr *) skb->data; |
1016 | ||
24338793 | 1017 | tx->sta = sta_info_get(local, hdr->addr1); |
1018 | tx->fc = le16_to_cpu(hdr->frame_control); | |
58d4185e | 1019 | |
badffb72 | 1020 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1021 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e2ebc74d | 1022 | control->flags |= IEEE80211_TXCTL_NO_ACK; |
badffb72 | 1023 | } else { |
5cf121c3 | 1024 | tx->flags |= IEEE80211_TX_UNICAST; |
e2ebc74d | 1025 | control->flags &= ~IEEE80211_TXCTL_NO_ACK; |
badffb72 | 1026 | } |
58d4185e | 1027 | |
5cf121c3 JB |
1028 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1029 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e JB |
1030 | skb->len + FCS_LEN > local->fragmentation_threshold && |
1031 | !local->ops->set_frag_threshold) | |
5cf121c3 | 1032 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1033 | else |
5cf121c3 | 1034 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1035 | } |
1036 | ||
e2ebc74d | 1037 | if (!tx->sta) |
d46e144b | 1038 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; |
07346f81 | 1039 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
d46e144b | 1040 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; |
58d4185e | 1041 | |
e2ebc74d JB |
1042 | hdrlen = ieee80211_get_hdrlen(tx->fc); |
1043 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { | |
1044 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1045 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1046 | } | |
1047 | control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT; | |
1048 | ||
9ae54c84 | 1049 | return TX_CONTINUE; |
e2ebc74d JB |
1050 | } |
1051 | ||
32bfd35d | 1052 | /* |
58d4185e JB |
1053 | * NB: @tx is uninitialised when passed in here |
1054 | */ | |
5cf121c3 | 1055 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e JB |
1056 | struct sk_buff *skb, |
1057 | struct net_device *mdev, | |
1058 | struct ieee80211_tx_control *control) | |
e2ebc74d JB |
1059 | { |
1060 | struct ieee80211_tx_packet_data *pkt_data; | |
1061 | struct net_device *dev; | |
1062 | ||
1063 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
881d966b | 1064 | dev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1065 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1066 | dev_put(dev); | |
1067 | dev = NULL; | |
1068 | } | |
1069 | if (unlikely(!dev)) | |
1070 | return -ENODEV; | |
58d4185e | 1071 | /* initialises tx with control */ |
e2ebc74d | 1072 | __ieee80211_tx_prepare(tx, skb, dev, control); |
32bfd35d | 1073 | dev_put(dev); |
e2ebc74d JB |
1074 | return 0; |
1075 | } | |
1076 | ||
1077 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1078 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1079 | { |
5cf121c3 | 1080 | struct ieee80211_tx_control *control = tx->control; |
e2ebc74d JB |
1081 | int ret, i; |
1082 | ||
1083 | if (!ieee80211_qdisc_installed(local->mdev) && | |
1084 | __ieee80211_queue_stopped(local, 0)) { | |
1085 | netif_stop_queue(local->mdev); | |
1086 | return IEEE80211_TX_AGAIN; | |
1087 | } | |
1088 | if (skb) { | |
dd1cd4c6 JB |
1089 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
1090 | "TX to low-level driver", skb); | |
e2ebc74d JB |
1091 | ret = local->ops->tx(local_to_hw(local), skb, control); |
1092 | if (ret) | |
1093 | return IEEE80211_TX_AGAIN; | |
1094 | local->mdev->trans_start = jiffies; | |
1095 | ieee80211_led_tx(local, 1); | |
1096 | } | |
5cf121c3 | 1097 | if (tx->extra_frag) { |
e2ebc74d JB |
1098 | control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS | |
1099 | IEEE80211_TXCTL_USE_CTS_PROTECT | | |
d46e144b | 1100 | IEEE80211_TXCTL_CLEAR_PS_FILT | |
e2ebc74d | 1101 | IEEE80211_TXCTL_FIRST_FRAGMENT); |
5cf121c3 JB |
1102 | for (i = 0; i < tx->num_extra_frag; i++) { |
1103 | if (!tx->extra_frag[i]) | |
e2ebc74d JB |
1104 | continue; |
1105 | if (__ieee80211_queue_stopped(local, control->queue)) | |
1106 | return IEEE80211_TX_FRAG_AGAIN; | |
5cf121c3 | 1107 | if (i == tx->num_extra_frag) { |
2e92e6f2 | 1108 | control->tx_rate_idx = tx->last_frag_rate_idx; |
8318d78a | 1109 | |
5cf121c3 | 1110 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e2ebc74d JB |
1111 | control->flags |= |
1112 | IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1113 | else | |
1114 | control->flags &= | |
1115 | ~IEEE80211_TXCTL_RATE_CTRL_PROBE; | |
1116 | } | |
1117 | ||
dd1cd4c6 | 1118 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
e2ebc74d | 1119 | "TX to low-level driver", |
5cf121c3 | 1120 | tx->extra_frag[i]); |
e2ebc74d | 1121 | ret = local->ops->tx(local_to_hw(local), |
5cf121c3 | 1122 | tx->extra_frag[i], |
e2ebc74d JB |
1123 | control); |
1124 | if (ret) | |
1125 | return IEEE80211_TX_FRAG_AGAIN; | |
1126 | local->mdev->trans_start = jiffies; | |
1127 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1128 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1129 | } |
5cf121c3 JB |
1130 | kfree(tx->extra_frag); |
1131 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1132 | } |
1133 | return IEEE80211_TX_OK; | |
1134 | } | |
1135 | ||
1136 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb, | |
f9d540ee | 1137 | struct ieee80211_tx_control *control) |
e2ebc74d JB |
1138 | { |
1139 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1140 | struct sta_info *sta; | |
1141 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1142 | struct ieee80211_tx_data tx; |
9ae54c84 | 1143 | ieee80211_tx_result res = TX_DROP, res_prepare; |
e2ebc74d JB |
1144 | int ret, i; |
1145 | ||
1146 | WARN_ON(__ieee80211_queue_pending(local, control->queue)); | |
1147 | ||
1148 | if (unlikely(skb->len < 10)) { | |
1149 | dev_kfree_skb(skb); | |
1150 | return 0; | |
1151 | } | |
1152 | ||
d0709a65 JB |
1153 | rcu_read_lock(); |
1154 | ||
58d4185e | 1155 | /* initialises tx */ |
e2ebc74d JB |
1156 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control); |
1157 | ||
9ae54c84 | 1158 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1159 | dev_kfree_skb(skb); |
d0709a65 | 1160 | rcu_read_unlock(); |
e2ebc74d JB |
1161 | return 0; |
1162 | } | |
1163 | ||
1164 | sta = tx.sta; | |
5cf121c3 | 1165 | tx.channel = local->hw.conf.channel; |
2e92e6f2 | 1166 | control->band = tx.channel->band; |
e2ebc74d | 1167 | |
58905290 | 1168 | for (handler = ieee80211_tx_handlers; *handler != NULL; |
58d4185e JB |
1169 | handler++) { |
1170 | res = (*handler)(&tx); | |
9ae54c84 | 1171 | if (res != TX_CONTINUE) |
58d4185e | 1172 | break; |
e2ebc74d JB |
1173 | } |
1174 | ||
1175 | skb = tx.skb; /* handlers are allowed to change skb */ | |
1176 | ||
9ae54c84 | 1177 | if (unlikely(res == TX_DROP)) { |
e2ebc74d JB |
1178 | I802_DEBUG_INC(local->tx_handlers_drop); |
1179 | goto drop; | |
1180 | } | |
1181 | ||
9ae54c84 | 1182 | if (unlikely(res == TX_QUEUED)) { |
e2ebc74d | 1183 | I802_DEBUG_INC(local->tx_handlers_queued); |
d4e46a3d | 1184 | rcu_read_unlock(); |
e2ebc74d JB |
1185 | return 0; |
1186 | } | |
1187 | ||
5cf121c3 JB |
1188 | if (tx.extra_frag) { |
1189 | for (i = 0; i < tx.num_extra_frag; i++) { | |
e2ebc74d JB |
1190 | int next_len, dur; |
1191 | struct ieee80211_hdr *hdr = | |
1192 | (struct ieee80211_hdr *) | |
5cf121c3 | 1193 | tx.extra_frag[i]->data; |
e2ebc74d | 1194 | |
5cf121c3 JB |
1195 | if (i + 1 < tx.num_extra_frag) { |
1196 | next_len = tx.extra_frag[i + 1]->len; | |
e2ebc74d JB |
1197 | } else { |
1198 | next_len = 0; | |
2e92e6f2 | 1199 | tx.rate_idx = tx.last_frag_rate_idx; |
e2ebc74d JB |
1200 | } |
1201 | dur = ieee80211_duration(&tx, 0, next_len); | |
1202 | hdr->duration_id = cpu_to_le16(dur); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | retry: | |
1207 | ret = __ieee80211_tx(local, skb, &tx); | |
1208 | if (ret) { | |
1209 | struct ieee80211_tx_stored_packet *store = | |
1210 | &local->pending_packet[control->queue]; | |
1211 | ||
1212 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1213 | skb = NULL; | |
1214 | set_bit(IEEE80211_LINK_STATE_PENDING, | |
1215 | &local->state[control->queue]); | |
1216 | smp_mb(); | |
1217 | /* When the driver gets out of buffers during sending of | |
1218 | * fragments and calls ieee80211_stop_queue, there is | |
1219 | * a small window between IEEE80211_LINK_STATE_XOFF and | |
1220 | * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer | |
1221 | * gets available in that window (i.e. driver calls | |
1222 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
1223 | * called with IEEE80211_LINK_STATE_PENDING. Prevent this by | |
1224 | * continuing transmitting here when that situation is | |
1225 | * possible to have happened. */ | |
1226 | if (!__ieee80211_queue_stopped(local, control->queue)) { | |
1227 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1228 | &local->state[control->queue]); | |
1229 | goto retry; | |
1230 | } | |
1231 | memcpy(&store->control, control, | |
1232 | sizeof(struct ieee80211_tx_control)); | |
1233 | store->skb = skb; | |
5cf121c3 JB |
1234 | store->extra_frag = tx.extra_frag; |
1235 | store->num_extra_frag = tx.num_extra_frag; | |
2e92e6f2 | 1236 | store->last_frag_rate_idx = tx.last_frag_rate_idx; |
badffb72 | 1237 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1238 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1239 | } |
d4e46a3d | 1240 | rcu_read_unlock(); |
e2ebc74d JB |
1241 | return 0; |
1242 | ||
1243 | drop: | |
1244 | if (skb) | |
1245 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1246 | for (i = 0; i < tx.num_extra_frag; i++) |
1247 | if (tx.extra_frag[i]) | |
1248 | dev_kfree_skb(tx.extra_frag[i]); | |
1249 | kfree(tx.extra_frag); | |
d4e46a3d | 1250 | rcu_read_unlock(); |
e2ebc74d JB |
1251 | return 0; |
1252 | } | |
1253 | ||
1254 | /* device xmit handlers */ | |
1255 | ||
1256 | int ieee80211_master_start_xmit(struct sk_buff *skb, | |
1257 | struct net_device *dev) | |
1258 | { | |
1259 | struct ieee80211_tx_control control; | |
1260 | struct ieee80211_tx_packet_data *pkt_data; | |
1261 | struct net_device *odev = NULL; | |
1262 | struct ieee80211_sub_if_data *osdata; | |
1263 | int headroom; | |
1264 | int ret; | |
1265 | ||
1266 | /* | |
1267 | * copy control out of the skb so other people can use skb->cb | |
1268 | */ | |
1269 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1270 | memset(&control, 0, sizeof(struct ieee80211_tx_control)); | |
1271 | ||
1272 | if (pkt_data->ifindex) | |
881d966b | 1273 | odev = dev_get_by_index(&init_net, pkt_data->ifindex); |
e2ebc74d JB |
1274 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1275 | dev_put(odev); | |
1276 | odev = NULL; | |
1277 | } | |
1278 | if (unlikely(!odev)) { | |
1279 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1280 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1281 | "originating device\n", dev->name); | |
1282 | #endif | |
1283 | dev_kfree_skb(skb); | |
1284 | return 0; | |
1285 | } | |
1286 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); | |
1287 | ||
1288 | headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM; | |
1289 | if (skb_headroom(skb) < headroom) { | |
1290 | if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { | |
1291 | dev_kfree_skb(skb); | |
1292 | dev_put(odev); | |
1293 | return 0; | |
1294 | } | |
1295 | } | |
1296 | ||
32bfd35d | 1297 | control.vif = &osdata->vif; |
51fb61e7 | 1298 | control.type = osdata->vif.type; |
e8bf9649 | 1299 | if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS) |
e2ebc74d | 1300 | control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS; |
e8bf9649 | 1301 | if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT) |
e2ebc74d | 1302 | control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
e8bf9649 | 1303 | if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) |
e2ebc74d | 1304 | control.flags |= IEEE80211_TXCTL_REQUEUE; |
678f5f71 JB |
1305 | if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME) |
1306 | control.flags |= IEEE80211_TXCTL_EAPOL_FRAME; | |
9e723492 RR |
1307 | if (pkt_data->flags & IEEE80211_TXPD_AMPDU) |
1308 | control.flags |= IEEE80211_TXCTL_AMPDU; | |
e2ebc74d JB |
1309 | control.queue = pkt_data->queue; |
1310 | ||
f9d540ee | 1311 | ret = ieee80211_tx(odev, skb, &control); |
e2ebc74d JB |
1312 | dev_put(odev); |
1313 | ||
1314 | return ret; | |
1315 | } | |
1316 | ||
1317 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1318 | struct net_device *dev) | |
1319 | { | |
1320 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1321 | struct ieee80211_tx_packet_data *pkt_data; | |
1322 | struct ieee80211_radiotap_header *prthdr = | |
1323 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1324 | u16 len_rthdr; |
e2ebc74d | 1325 | |
9b8a74e3 AG |
1326 | /* check for not even having the fixed radiotap header part */ |
1327 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1328 | goto fail; /* too short to be possibly valid */ | |
1329 | ||
1330 | /* is it a header version we can trust to find length from? */ | |
1331 | if (unlikely(prthdr->it_version)) | |
1332 | goto fail; /* only version 0 is supported */ | |
1333 | ||
1334 | /* then there must be a radiotap header with a length we can use */ | |
1335 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1336 | ||
1337 | /* does the skb contain enough to deliver on the alleged length? */ | |
1338 | if (unlikely(skb->len < len_rthdr)) | |
1339 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1340 | |
1341 | skb->dev = local->mdev; | |
1342 | ||
1343 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1344 | memset(pkt_data, 0, sizeof(*pkt_data)); | |
9b8a74e3 | 1345 | /* needed because we set skb device to master */ |
e2ebc74d | 1346 | pkt_data->ifindex = dev->ifindex; |
9b8a74e3 | 1347 | |
e8bf9649 | 1348 | pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT; |
b0a67179 ID |
1349 | /* Interfaces should always request a status report */ |
1350 | pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS; | |
e2ebc74d | 1351 | |
e2ebc74d JB |
1352 | /* |
1353 | * fix up the pointers accounting for the radiotap | |
1354 | * header still being in there. We are being given | |
1355 | * a precooked IEEE80211 header so no need for | |
1356 | * normal processing | |
1357 | */ | |
9b8a74e3 | 1358 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1359 | /* |
9b8a74e3 AG |
1360 | * these are just fixed to the end of the rt area since we |
1361 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1362 | */ |
9b8a74e3 AG |
1363 | skb_set_network_header(skb, len_rthdr); |
1364 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1365 | |
9b8a74e3 AG |
1366 | /* pass the radiotap header up to the next stage intact */ |
1367 | dev_queue_xmit(skb); | |
e2ebc74d | 1368 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1369 | |
1370 | fail: | |
1371 | dev_kfree_skb(skb); | |
1372 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1373 | } |
1374 | ||
1375 | /** | |
1376 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1377 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1378 | * @skb: packet to be sent | |
1379 | * @dev: incoming interface | |
1380 | * | |
1381 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1382 | * not be freed, and caller is responsible for either retrying later or freeing | |
1383 | * skb). | |
1384 | * | |
1385 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1386 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1387 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1388 | * transmission (through low-level driver). | |
1389 | */ | |
1390 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1391 | struct net_device *dev) | |
1392 | { | |
1393 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1394 | struct ieee80211_tx_packet_data *pkt_data; | |
1395 | struct ieee80211_sub_if_data *sdata; | |
1396 | int ret = 1, head_need; | |
33b64eb2 | 1397 | u16 ethertype, hdrlen, meshhdrlen = 0, fc; |
e2ebc74d | 1398 | struct ieee80211_hdr hdr; |
33b64eb2 | 1399 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1400 | const u8 *encaps_data; |
1401 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1402 | int nh_pos, h_pos; |
e2ebc74d | 1403 | struct sta_info *sta; |
ce3edf6d | 1404 | u32 sta_flags = 0; |
e2ebc74d JB |
1405 | |
1406 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1407 | if (unlikely(skb->len < ETH_HLEN)) { | |
1408 | printk(KERN_DEBUG "%s: short skb (len=%d)\n", | |
1409 | dev->name, skb->len); | |
1410 | ret = 0; | |
1411 | goto fail; | |
1412 | } | |
1413 | ||
1414 | nh_pos = skb_network_header(skb) - skb->data; | |
1415 | h_pos = skb_transport_header(skb) - skb->data; | |
1416 | ||
1417 | /* convert Ethernet header to proper 802.11 header (based on | |
1418 | * operation mode) */ | |
1419 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
e2ebc74d JB |
1420 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; |
1421 | ||
51fb61e7 | 1422 | switch (sdata->vif.type) { |
cf966838 JB |
1423 | case IEEE80211_IF_TYPE_AP: |
1424 | case IEEE80211_IF_TYPE_VLAN: | |
e2ebc74d JB |
1425 | fc |= IEEE80211_FCTL_FROMDS; |
1426 | /* DA BSSID SA */ | |
1427 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1428 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1429 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1430 | hdrlen = 24; | |
cf966838 JB |
1431 | break; |
1432 | case IEEE80211_IF_TYPE_WDS: | |
e2ebc74d JB |
1433 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; |
1434 | /* RA TA DA SA */ | |
1435 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
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 | hdrlen = 30; | |
cf966838 | 1440 | break; |
33b64eb2 LCC |
1441 | #ifdef CONFIG_MAC80211_MESH |
1442 | case IEEE80211_IF_TYPE_MESH_POINT: | |
1443 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; | |
1444 | /* RA TA DA SA */ | |
1445 | if (is_multicast_ether_addr(skb->data)) | |
1446 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1447 | else if (mesh_nexthop_lookup(hdr.addr1, skb, dev)) | |
1448 | return 0; | |
1449 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1450 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1451 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1452 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
1453 | /* Forwarded frame, keep mesh ttl and seqnum */ | |
1454 | struct ieee80211s_hdr *prev_meshhdr; | |
1455 | prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb); | |
1456 | meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr); | |
1457 | memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen); | |
1458 | sdata->u.sta.mshstats.fwded_frames++; | |
1459 | } else { | |
1460 | if (!sdata->u.sta.mshcfg.dot11MeshTTL) { | |
1461 | /* Do not send frames with mesh_ttl == 0 */ | |
1462 | sdata->u.sta.mshstats.dropped_frames_ttl++; | |
1463 | ret = 0; | |
1464 | goto fail; | |
1465 | } | |
1466 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
902acc78 | 1467 | sdata); |
33b64eb2 LCC |
1468 | } |
1469 | hdrlen = 30; | |
1470 | break; | |
1471 | #endif | |
cf966838 | 1472 | case IEEE80211_IF_TYPE_STA: |
e2ebc74d JB |
1473 | fc |= IEEE80211_FCTL_TODS; |
1474 | /* BSSID SA DA */ | |
1475 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1476 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1477 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1478 | hdrlen = 24; | |
cf966838 JB |
1479 | break; |
1480 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1481 | /* DA SA BSSID */ |
1482 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1483 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1484 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1485 | hdrlen = 24; | |
cf966838 JB |
1486 | break; |
1487 | default: | |
e2ebc74d JB |
1488 | ret = 0; |
1489 | goto fail; | |
1490 | } | |
1491 | ||
7d185b8b JB |
1492 | /* |
1493 | * There's no need to try to look up the destination | |
1494 | * if it is a multicast address (which can only happen | |
1495 | * in AP mode) | |
1496 | */ | |
1497 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1498 | rcu_read_lock(); |
7d185b8b | 1499 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1500 | if (sta) |
07346f81 | 1501 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1502 | rcu_read_unlock(); |
e2ebc74d JB |
1503 | } |
1504 | ||
3434fbd3 JB |
1505 | /* receiver and we are QoS enabled, use a QoS type frame */ |
1506 | if (sta_flags & WLAN_STA_WME && local->hw.queues >= 4) { | |
ce3edf6d JB |
1507 | fc |= IEEE80211_STYPE_QOS_DATA; |
1508 | hdrlen += 2; | |
1509 | } | |
1510 | ||
1511 | /* | |
238814fd JB |
1512 | * Drop unicast frames to unauthorised stations unless they are |
1513 | * EAPOL frames from the local station. | |
ce3edf6d | 1514 | */ |
238814fd | 1515 | if (unlikely(!is_multicast_ether_addr(hdr.addr1) && |
33b64eb2 LCC |
1516 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1517 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1518 | compare_ether_addr(dev->dev_addr, |
1519 | skb->data + ETH_ALEN) == 0))) { | |
1520 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1521 | DECLARE_MAC_BUF(mac); | |
1522 | ||
1523 | if (net_ratelimit()) | |
1524 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1525 | " (unauthorized port)\n", dev->name, | |
1526 | print_mac(mac, hdr.addr1)); | |
1527 | #endif | |
1528 | ||
1529 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1530 | ||
1531 | ret = 0; | |
1532 | goto fail; | |
1533 | } | |
1534 | ||
e2ebc74d JB |
1535 | hdr.frame_control = cpu_to_le16(fc); |
1536 | hdr.duration_id = 0; | |
1537 | hdr.seq_ctrl = 0; | |
1538 | ||
1539 | skip_header_bytes = ETH_HLEN; | |
1540 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1541 | encaps_data = bridge_tunnel_header; | |
1542 | encaps_len = sizeof(bridge_tunnel_header); | |
1543 | skip_header_bytes -= 2; | |
1544 | } else if (ethertype >= 0x600) { | |
1545 | encaps_data = rfc1042_header; | |
1546 | encaps_len = sizeof(rfc1042_header); | |
1547 | skip_header_bytes -= 2; | |
1548 | } else { | |
1549 | encaps_data = NULL; | |
1550 | encaps_len = 0; | |
1551 | } | |
1552 | ||
1553 | skb_pull(skb, skip_header_bytes); | |
1554 | nh_pos -= skip_header_bytes; | |
1555 | h_pos -= skip_header_bytes; | |
1556 | ||
1557 | /* TODO: implement support for fragments so that there is no need to | |
1558 | * reallocate and copy payload; it might be enough to support one | |
1559 | * extra fragment that would be copied in the beginning of the frame | |
1560 | * data.. anyway, it would be nice to include this into skb structure | |
1561 | * somehow | |
1562 | * | |
1563 | * There are few options for this: | |
1564 | * use skb->cb as an extra space for 802.11 header | |
1565 | * allocate new buffer if not enough headroom | |
1566 | * make sure that there is enough headroom in every skb by increasing | |
1567 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1568 | * alloc_skb() (net/core/skbuff.c) | |
1569 | */ | |
33b64eb2 | 1570 | head_need = hdrlen + encaps_len + meshhdrlen + local->tx_headroom; |
e2ebc74d JB |
1571 | head_need -= skb_headroom(skb); |
1572 | ||
1573 | /* We are going to modify skb data, so make a copy of it if happens to | |
1574 | * be cloned. This could happen, e.g., with Linux bridge code passing | |
1575 | * us broadcast frames. */ | |
1576 | ||
608961a5 | 1577 | if (head_need > 0 || skb_header_cloned(skb)) { |
e2ebc74d JB |
1578 | #if 0 |
1579 | printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " | |
1580 | "of headroom\n", dev->name, head_need); | |
1581 | #endif | |
1582 | ||
608961a5 | 1583 | if (skb_header_cloned(skb)) |
e2ebc74d JB |
1584 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); |
1585 | else | |
1586 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1587 | /* Since we have to reallocate the buffer, make sure that there | |
1588 | * is enough room for possible WEP IV/ICV and TKIP (8 bytes | |
1589 | * before payload and 12 after). */ | |
1590 | if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8), | |
1591 | 12, GFP_ATOMIC)) { | |
1592 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer" | |
1593 | "\n", dev->name); | |
1594 | goto fail; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | if (encaps_data) { | |
1599 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1600 | nh_pos += encaps_len; | |
1601 | h_pos += encaps_len; | |
1602 | } | |
c29b9b9b | 1603 | |
33b64eb2 LCC |
1604 | if (meshhdrlen > 0) { |
1605 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1606 | nh_pos += meshhdrlen; | |
1607 | h_pos += meshhdrlen; | |
1608 | } | |
1609 | ||
c29b9b9b JB |
1610 | if (fc & IEEE80211_STYPE_QOS_DATA) { |
1611 | __le16 *qos_control; | |
1612 | ||
1613 | qos_control = (__le16*) skb_push(skb, 2); | |
1614 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1615 | /* | |
1616 | * Maybe we could actually set some fields here, for now just | |
1617 | * initialise to zero to indicate no special operation. | |
1618 | */ | |
1619 | *qos_control = 0; | |
1620 | } else | |
1621 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1622 | ||
e2ebc74d JB |
1623 | nh_pos += hdrlen; |
1624 | h_pos += hdrlen; | |
1625 | ||
1626 | pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; | |
1627 | memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); | |
1628 | pkt_data->ifindex = dev->ifindex; | |
678f5f71 JB |
1629 | if (ethertype == ETH_P_PAE) |
1630 | pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME; | |
e2ebc74d | 1631 | |
b0a67179 ID |
1632 | /* Interfaces should always request a status report */ |
1633 | pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS; | |
1634 | ||
e2ebc74d | 1635 | skb->dev = local->mdev; |
68aae116 SH |
1636 | dev->stats.tx_packets++; |
1637 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1638 | |
1639 | /* Update skb pointers to various headers since this modified frame | |
1640 | * is going to go through Linux networking code that may potentially | |
1641 | * need things like pointer to IP header. */ | |
1642 | skb_set_mac_header(skb, 0); | |
1643 | skb_set_network_header(skb, nh_pos); | |
1644 | skb_set_transport_header(skb, h_pos); | |
1645 | ||
1646 | dev->trans_start = jiffies; | |
1647 | dev_queue_xmit(skb); | |
1648 | ||
1649 | return 0; | |
1650 | ||
1651 | fail: | |
1652 | if (!ret) | |
1653 | dev_kfree_skb(skb); | |
1654 | ||
1655 | return ret; | |
1656 | } | |
1657 | ||
e2ebc74d JB |
1658 | /* helper functions for pending packets for when queues are stopped */ |
1659 | ||
1660 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) | |
1661 | { | |
1662 | int i, j; | |
1663 | struct ieee80211_tx_stored_packet *store; | |
1664 | ||
1665 | for (i = 0; i < local->hw.queues; i++) { | |
1666 | if (!__ieee80211_queue_pending(local, i)) | |
1667 | continue; | |
1668 | store = &local->pending_packet[i]; | |
1669 | kfree_skb(store->skb); | |
1670 | for (j = 0; j < store->num_extra_frag; j++) | |
1671 | kfree_skb(store->extra_frag[j]); | |
1672 | kfree(store->extra_frag); | |
1673 | clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]); | |
1674 | } | |
1675 | } | |
1676 | ||
1677 | void ieee80211_tx_pending(unsigned long data) | |
1678 | { | |
1679 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1680 | struct net_device *dev = local->mdev; | |
1681 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1682 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
1683 | int i, ret, reschedule = 0; |
1684 | ||
1685 | netif_tx_lock_bh(dev); | |
1686 | for (i = 0; i < local->hw.queues; i++) { | |
1687 | if (__ieee80211_queue_stopped(local, i)) | |
1688 | continue; | |
1689 | if (!__ieee80211_queue_pending(local, i)) { | |
1690 | reschedule = 1; | |
1691 | continue; | |
1692 | } | |
1693 | store = &local->pending_packet[i]; | |
5cf121c3 JB |
1694 | tx.control = &store->control; |
1695 | tx.extra_frag = store->extra_frag; | |
1696 | tx.num_extra_frag = store->num_extra_frag; | |
2e92e6f2 | 1697 | tx.last_frag_rate_idx = store->last_frag_rate_idx; |
badffb72 JS |
1698 | tx.flags = 0; |
1699 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1700 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1701 | ret = __ieee80211_tx(local, store->skb, &tx); |
1702 | if (ret) { | |
1703 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1704 | store->skb = NULL; | |
1705 | } else { | |
1706 | clear_bit(IEEE80211_LINK_STATE_PENDING, | |
1707 | &local->state[i]); | |
1708 | reschedule = 1; | |
1709 | } | |
1710 | } | |
1711 | netif_tx_unlock_bh(dev); | |
1712 | if (reschedule) { | |
1713 | if (!ieee80211_qdisc_installed(dev)) { | |
1714 | if (!__ieee80211_queue_stopped(local, 0)) | |
1715 | netif_wake_queue(dev); | |
1716 | } else | |
1717 | netif_schedule(dev); | |
1718 | } | |
1719 | } | |
1720 | ||
1721 | /* functions for drivers to get certain frames */ | |
1722 | ||
1723 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1724 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1725 | struct sk_buff *skb, |
1726 | struct beacon_data *beacon) | |
e2ebc74d JB |
1727 | { |
1728 | u8 *pos, *tim; | |
1729 | int aid0 = 0; | |
1730 | int i, have_bits = 0, n1, n2; | |
1731 | ||
1732 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1733 | * mode. */ | |
e2ebc74d JB |
1734 | if (atomic_read(&bss->num_sta_ps) > 0) |
1735 | /* in the hope that this is faster than | |
1736 | * checking byte-for-byte */ | |
1737 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1738 | IEEE80211_MAX_AID+1); | |
1739 | ||
1740 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1741 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1742 | else |
1743 | bss->dtim_count--; | |
1744 | ||
1745 | tim = pos = (u8 *) skb_put(skb, 6); | |
1746 | *pos++ = WLAN_EID_TIM; | |
1747 | *pos++ = 4; | |
1748 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1749 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1750 | |
1751 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1752 | aid0 = 1; | |
1753 | ||
1754 | if (have_bits) { | |
1755 | /* Find largest even number N1 so that bits numbered 1 through | |
1756 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1757 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1758 | n1 = 0; | |
1759 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1760 | if (bss->tim[i]) { | |
1761 | n1 = i & 0xfe; | |
1762 | break; | |
1763 | } | |
1764 | } | |
1765 | n2 = n1; | |
1766 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1767 | if (bss->tim[i]) { | |
1768 | n2 = i; | |
1769 | break; | |
1770 | } | |
1771 | } | |
1772 | ||
1773 | /* Bitmap control */ | |
1774 | *pos++ = n1 | aid0; | |
1775 | /* Part Virt Bitmap */ | |
1776 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1777 | ||
1778 | tim[1] = n2 - n1 + 4; | |
1779 | skb_put(skb, n2 - n1); | |
1780 | } else { | |
1781 | *pos++ = aid0; /* Bitmap control */ | |
1782 | *pos++ = 0; /* Part Virt Bitmap */ | |
1783 | } | |
e2ebc74d JB |
1784 | } |
1785 | ||
32bfd35d JB |
1786 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
1787 | struct ieee80211_vif *vif, | |
e2ebc74d JB |
1788 | struct ieee80211_tx_control *control) |
1789 | { | |
1790 | struct ieee80211_local *local = hw_to_local(hw); | |
1791 | struct sk_buff *skb; | |
1792 | struct net_device *bdev; | |
1793 | struct ieee80211_sub_if_data *sdata = NULL; | |
1794 | struct ieee80211_if_ap *ap = NULL; | |
1abbe498 | 1795 | struct rate_selection rsel; |
5dfdaf58 | 1796 | struct beacon_data *beacon; |
8318d78a | 1797 | struct ieee80211_supported_band *sband; |
902acc78 | 1798 | struct ieee80211_mgmt *mgmt; |
33b64eb2 | 1799 | int *num_beacons; |
902acc78 | 1800 | bool err = true; |
2e92e6f2 | 1801 | enum ieee80211_band band = local->hw.conf.channel->band; |
902acc78 | 1802 | u8 *pos; |
8318d78a | 1803 | |
2e92e6f2 | 1804 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1805 | |
1806 | rcu_read_lock(); | |
e2ebc74d | 1807 | |
32bfd35d JB |
1808 | sdata = vif_to_sdata(vif); |
1809 | bdev = sdata->dev; | |
e2ebc74d | 1810 | |
902acc78 | 1811 | if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
33b64eb2 LCC |
1812 | ap = &sdata->u.ap; |
1813 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1814 | if (ap && beacon) { |
1815 | /* | |
1816 | * headroom, head length, | |
1817 | * tail length and maximum TIM length | |
1818 | */ | |
1819 | skb = dev_alloc_skb(local->tx_headroom + | |
1820 | beacon->head_len + | |
1821 | beacon->tail_len + 256); | |
1822 | if (!skb) | |
1823 | goto out; | |
33b64eb2 | 1824 | |
902acc78 JB |
1825 | skb_reserve(skb, local->tx_headroom); |
1826 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1827 | beacon->head_len); | |
33b64eb2 | 1828 | |
902acc78 JB |
1829 | ieee80211_include_sequence(sdata, |
1830 | (struct ieee80211_hdr *)skb->data); | |
33b64eb2 | 1831 | |
d0709a65 JB |
1832 | /* |
1833 | * Not very nice, but we want to allow the driver to call | |
1834 | * ieee80211_beacon_get() as a response to the set_tim() | |
1835 | * callback. That, however, is already invoked under the | |
1836 | * sta_lock to guarantee consistent and race-free update | |
1837 | * of the tim bitmap in mac80211 and the driver. | |
1838 | */ | |
1839 | if (local->tim_in_locked_section) { | |
1840 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1841 | } else { | |
1842 | unsigned long flags; | |
1843 | ||
1844 | spin_lock_irqsave(&local->sta_lock, flags); | |
1845 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1846 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1847 | } | |
33b64eb2 | 1848 | |
902acc78 JB |
1849 | if (beacon->tail) |
1850 | memcpy(skb_put(skb, beacon->tail_len), | |
1851 | beacon->tail, beacon->tail_len); | |
33b64eb2 | 1852 | |
902acc78 | 1853 | num_beacons = &ap->num_beacons; |
33b64eb2 | 1854 | |
902acc78 JB |
1855 | err = false; |
1856 | } | |
1857 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
1858 | /* headroom, head length, tail length and maximum TIM length */ | |
1859 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1860 | if (!skb) | |
1861 | goto out; | |
1862 | ||
1863 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1864 | mgmt = (struct ieee80211_mgmt *) | |
1865 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1866 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
1867 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
1868 | IEEE80211_STYPE_BEACON); | |
1869 | memset(mgmt->da, 0xff, ETH_ALEN); | |
1870 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1871 | /* BSSID is left zeroed, wildcard value */ | |
1872 | mgmt->u.beacon.beacon_int = | |
1873 | cpu_to_le16(local->hw.conf.beacon_int); | |
1874 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1875 | ||
1876 | pos = skb_put(skb, 2); | |
1877 | *pos++ = WLAN_EID_SSID; | |
1878 | *pos++ = 0x0; | |
1879 | ||
1880 | mesh_mgmt_ies_add(skb, sdata->dev); | |
33b64eb2 | 1881 | |
33b64eb2 | 1882 | num_beacons = &sdata->u.sta.num_beacons; |
33b64eb2 | 1883 | |
902acc78 | 1884 | err = false; |
33b64eb2 | 1885 | } |
5dfdaf58 | 1886 | |
33b64eb2 | 1887 | if (err) { |
e2ebc74d JB |
1888 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1889 | if (net_ratelimit()) | |
32bfd35d JB |
1890 | printk(KERN_DEBUG "no beacon data avail for %s\n", |
1891 | bdev->name); | |
e2ebc74d | 1892 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
5dfdaf58 JB |
1893 | skb = NULL; |
1894 | goto out; | |
e2ebc74d JB |
1895 | } |
1896 | ||
e2ebc74d | 1897 | if (control) { |
2e92e6f2 | 1898 | control->band = band; |
8318d78a | 1899 | rate_control_get_rate(local->mdev, sband, skb, &rsel); |
2e92e6f2 | 1900 | if (unlikely(rsel.rate_idx < 0)) { |
e2ebc74d | 1901 | if (net_ratelimit()) { |
1abbe498 MN |
1902 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " |
1903 | "no rate found\n", | |
1904 | wiphy_name(local->hw.wiphy)); | |
e2ebc74d JB |
1905 | } |
1906 | dev_kfree_skb(skb); | |
5dfdaf58 JB |
1907 | skb = NULL; |
1908 | goto out; | |
e2ebc74d JB |
1909 | } |
1910 | ||
0f7054e3 | 1911 | control->vif = vif; |
2e92e6f2 | 1912 | control->tx_rate_idx = rsel.rate_idx; |
8318d78a | 1913 | if (sdata->bss_conf.use_short_preamble && |
2e92e6f2 | 1914 | sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) |
8318d78a | 1915 | control->flags |= IEEE80211_TXCTL_SHORT_PREAMBLE; |
e2ebc74d | 1916 | control->antenna_sel_tx = local->hw.conf.antenna_sel_tx; |
e2ebc74d | 1917 | control->flags |= IEEE80211_TXCTL_NO_ACK; |
df442054 | 1918 | control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; |
e2ebc74d | 1919 | control->retry_limit = 1; |
d46e144b | 1920 | control->flags |= IEEE80211_TXCTL_CLEAR_PS_FILT; |
e2ebc74d | 1921 | } |
33b64eb2 LCC |
1922 | (*num_beacons)++; |
1923 | out: | |
5dfdaf58 | 1924 | rcu_read_unlock(); |
e2ebc74d JB |
1925 | return skb; |
1926 | } | |
1927 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1928 | ||
32bfd35d | 1929 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d JB |
1930 | const void *frame, size_t frame_len, |
1931 | const struct ieee80211_tx_control *frame_txctl, | |
1932 | struct ieee80211_rts *rts) | |
1933 | { | |
1934 | const struct ieee80211_hdr *hdr = frame; | |
1935 | u16 fctl; | |
1936 | ||
1937 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS; | |
1938 | rts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1939 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1940 | frame_txctl); | |
e2ebc74d JB |
1941 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1942 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1943 | } | |
1944 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1945 | ||
32bfd35d | 1946 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d JB |
1947 | const void *frame, size_t frame_len, |
1948 | const struct ieee80211_tx_control *frame_txctl, | |
1949 | struct ieee80211_cts *cts) | |
1950 | { | |
1951 | const struct ieee80211_hdr *hdr = frame; | |
1952 | u16 fctl; | |
1953 | ||
1954 | fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS; | |
1955 | cts->frame_control = cpu_to_le16(fctl); | |
32bfd35d JB |
1956 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1957 | frame_len, frame_txctl); | |
e2ebc74d JB |
1958 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1959 | } | |
1960 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1961 | ||
1962 | struct sk_buff * | |
32bfd35d JB |
1963 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
1964 | struct ieee80211_vif *vif, | |
e2ebc74d JB |
1965 | struct ieee80211_tx_control *control) |
1966 | { | |
1967 | struct ieee80211_local *local = hw_to_local(hw); | |
1968 | struct sk_buff *skb; | |
1969 | struct sta_info *sta; | |
1970 | ieee80211_tx_handler *handler; | |
5cf121c3 | 1971 | struct ieee80211_tx_data tx; |
9ae54c84 | 1972 | ieee80211_tx_result res = TX_DROP; |
e2ebc74d JB |
1973 | struct net_device *bdev; |
1974 | struct ieee80211_sub_if_data *sdata; | |
1975 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 1976 | struct beacon_data *beacon; |
e2ebc74d | 1977 | |
32bfd35d JB |
1978 | sdata = vif_to_sdata(vif); |
1979 | bdev = sdata->dev; | |
1980 | ||
5dfdaf58 JB |
1981 | |
1982 | if (!bss) | |
e2ebc74d JB |
1983 | return NULL; |
1984 | ||
5dfdaf58 JB |
1985 | rcu_read_lock(); |
1986 | beacon = rcu_dereference(bss->beacon); | |
1987 | ||
1988 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || | |
1989 | !beacon->head) { | |
1990 | rcu_read_unlock(); | |
1991 | return NULL; | |
1992 | } | |
5dfdaf58 | 1993 | |
e2ebc74d JB |
1994 | if (bss->dtim_count != 0) |
1995 | return NULL; /* send buffered bc/mc only after DTIM beacon */ | |
1996 | memset(control, 0, sizeof(*control)); | |
1997 | while (1) { | |
1998 | skb = skb_dequeue(&bss->ps_bc_buf); | |
1999 | if (!skb) | |
2000 | return NULL; | |
2001 | local->total_ps_buffered--; | |
2002 | ||
2003 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2004 | struct ieee80211_hdr *hdr = | |
2005 | (struct ieee80211_hdr *) skb->data; | |
2006 | /* more buffered multicast/broadcast frames ==> set | |
2007 | * MoreData flag in IEEE 802.11 header to inform PS | |
2008 | * STAs */ | |
2009 | hdr->frame_control |= | |
2010 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2011 | } | |
2012 | ||
58d4185e | 2013 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control)) |
e2ebc74d JB |
2014 | break; |
2015 | dev_kfree_skb_any(skb); | |
2016 | } | |
2017 | sta = tx.sta; | |
5cf121c3 JB |
2018 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2019 | tx.channel = local->hw.conf.channel; | |
2e92e6f2 | 2020 | control->band = tx.channel->band; |
e2ebc74d | 2021 | |
58905290 | 2022 | for (handler = ieee80211_tx_handlers; *handler != NULL; handler++) { |
e2ebc74d | 2023 | res = (*handler)(&tx); |
9ae54c84 | 2024 | if (res == TX_DROP || res == TX_QUEUED) |
e2ebc74d JB |
2025 | break; |
2026 | } | |
e2ebc74d JB |
2027 | skb = tx.skb; /* handlers are allowed to change skb */ |
2028 | ||
9ae54c84 | 2029 | if (res == TX_DROP) { |
e2ebc74d JB |
2030 | I802_DEBUG_INC(local->tx_handlers_drop); |
2031 | dev_kfree_skb(skb); | |
2032 | skb = NULL; | |
9ae54c84 | 2033 | } else if (res == TX_QUEUED) { |
e2ebc74d JB |
2034 | I802_DEBUG_INC(local->tx_handlers_queued); |
2035 | skb = NULL; | |
2036 | } | |
2037 | ||
d0709a65 | 2038 | rcu_read_unlock(); |
e2ebc74d JB |
2039 | |
2040 | return skb; | |
2041 | } | |
2042 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |