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 | |
2de8e0d9 | 37 | #define IEEE80211_TX_PENDING 2 |
e2ebc74d JB |
38 | |
39 | /* misc utils */ | |
40 | ||
03f93c3d JB |
41 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
42 | int next_frag_len) | |
e2ebc74d JB |
43 | { |
44 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 45 | struct ieee80211_rate *txrate; |
e2ebc74d | 46 | struct ieee80211_local *local = tx->local; |
8318d78a | 47 | struct ieee80211_supported_band *sband; |
358c8d9d | 48 | struct ieee80211_hdr *hdr; |
e6a9854b JB |
49 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
50 | ||
51 | /* assume HW handles this */ | |
52 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) | |
53 | return 0; | |
54 | ||
55 | /* uh huh? */ | |
56 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) | |
57 | return 0; | |
e2ebc74d | 58 | |
2e92e6f2 | 59 | sband = local->hw.wiphy->bands[tx->channel->band]; |
e6a9854b | 60 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
8318d78a | 61 | |
e6a9854b | 62 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
e2ebc74d JB |
63 | |
64 | /* | |
65 | * data and mgmt (except PS Poll): | |
66 | * - during CFP: 32768 | |
67 | * - during contention period: | |
68 | * if addr1 is group address: 0 | |
69 | * if more fragments = 0 and addr1 is individual address: time to | |
70 | * transmit one ACK plus SIFS | |
71 | * if more fragments = 1 and addr1 is individual address: time to | |
72 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
73 | * | |
74 | * IEEE 802.11, 9.6: | |
75 | * - control response frame (CTS or ACK) shall be transmitted using the | |
76 | * same rate as the immediately previous frame in the frame exchange | |
77 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
78 | * at the highest possible rate belonging to the PHY rates in the | |
79 | * BSSBasicRateSet | |
80 | */ | |
358c8d9d HH |
81 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
82 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d | 83 | /* TODO: These control frames are not currently sent by |
ccd7b362 | 84 | * mac80211, but should they be implemented, this function |
e2ebc74d JB |
85 | * needs to be updated to support duration field calculation. |
86 | * | |
87 | * RTS: time needed to transmit pending data/mgmt frame plus | |
88 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
89 | * CTS: duration of immediately previous RTS minus time | |
90 | * required to transmit CTS and its SIFS | |
91 | * ACK: 0 if immediately previous directed data/mgmt had | |
92 | * more=0, with more=1 duration in ACK frame is duration | |
93 | * from previous frame minus time needed to transmit ACK | |
94 | * and its SIFS | |
95 | * PS Poll: BIT(15) | BIT(14) | aid | |
96 | */ | |
97 | return 0; | |
98 | } | |
99 | ||
100 | /* data/mgmt */ | |
101 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 102 | return cpu_to_le16(32768); |
e2ebc74d JB |
103 | |
104 | if (group_addr) /* Group address as the destination - no ACK */ | |
105 | return 0; | |
106 | ||
107 | /* Individual destination address: | |
108 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
109 | * CTS and ACK frames shall be transmitted using the highest rate in | |
110 | * basic rate set that is less than or equal to the rate of the | |
111 | * immediately previous frame and that is using the same modulation | |
112 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
113 | * the highest mandatory rate of the PHY that is less than or equal to | |
114 | * the rate of the previous frame is used. | |
115 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
116 | */ | |
117 | rate = -1; | |
8318d78a JB |
118 | /* use lowest available if everything fails */ |
119 | mrate = sband->bitrates[0].bitrate; | |
120 | for (i = 0; i < sband->n_bitrates; i++) { | |
121 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 122 | |
8318d78a JB |
123 | if (r->bitrate > txrate->bitrate) |
124 | break; | |
e2ebc74d | 125 | |
bda3933a | 126 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
8318d78a JB |
127 | rate = r->bitrate; |
128 | ||
129 | switch (sband->band) { | |
130 | case IEEE80211_BAND_2GHZ: { | |
131 | u32 flag; | |
132 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
133 | flag = IEEE80211_RATE_MANDATORY_G; | |
134 | else | |
135 | flag = IEEE80211_RATE_MANDATORY_B; | |
136 | if (r->flags & flag) | |
137 | mrate = r->bitrate; | |
138 | break; | |
139 | } | |
140 | case IEEE80211_BAND_5GHZ: | |
141 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
142 | mrate = r->bitrate; | |
143 | break; | |
144 | case IEEE80211_NUM_BANDS: | |
145 | WARN_ON(1); | |
146 | break; | |
147 | } | |
e2ebc74d JB |
148 | } |
149 | if (rate == -1) { | |
150 | /* No matching basic rate found; use highest suitable mandatory | |
151 | * PHY rate */ | |
152 | rate = mrate; | |
153 | } | |
154 | ||
155 | /* Time needed to transmit ACK | |
156 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
157 | * to closest integer */ | |
158 | ||
159 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
bda3933a | 160 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
161 | |
162 | if (next_frag_len) { | |
163 | /* Frame is fragmented: duration increases with time needed to | |
164 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
165 | dur *= 2; /* ACK + SIFS */ | |
166 | /* next fragment */ | |
167 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 168 | txrate->bitrate, erp, |
bda3933a | 169 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
170 | } |
171 | ||
03f93c3d | 172 | return cpu_to_le16(dur); |
e2ebc74d JB |
173 | } |
174 | ||
133b8226 JB |
175 | static int inline is_ieee80211_device(struct ieee80211_local *local, |
176 | struct net_device *dev) | |
e2ebc74d | 177 | { |
133b8226 | 178 | return local == wdev_priv(dev->ieee80211_ptr); |
e2ebc74d JB |
179 | } |
180 | ||
181 | /* tx handlers */ | |
182 | ||
d9e8a70f | 183 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 184 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 185 | { |
358c8d9d | 186 | |
e039fa4a | 187 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 188 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
189 | u32 sta_flags; |
190 | ||
e039fa4a | 191 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 192 | return TX_CONTINUE; |
58d4185e | 193 | |
c2b13452 | 194 | if (unlikely(tx->local->sw_scanning) && |
a9a6ffff KV |
195 | !ieee80211_is_probe_req(hdr->frame_control) && |
196 | !ieee80211_is_nullfunc(hdr->frame_control)) | |
197 | /* | |
198 | * When software scanning only nullfunc frames (to notify | |
199 | * the sleep state to the AP) and probe requests (for the | |
200 | * active scan) are allowed, all other frames should not be | |
201 | * sent and we should not get here, but if we do | |
202 | * nonetheless, drop them to avoid sending them | |
203 | * off-channel. See the link below and | |
204 | * ieee80211_start_scan() for more. | |
205 | * | |
206 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 | |
207 | */ | |
9ae54c84 | 208 | return TX_DROP; |
e2ebc74d | 209 | |
05c914fe | 210 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
211 | return TX_CONTINUE; |
212 | ||
5cf121c3 | 213 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 214 | return TX_CONTINUE; |
e2ebc74d | 215 | |
07346f81 | 216 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 217 | |
5cf121c3 | 218 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 219 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 220 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 221 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
222 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
223 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 JB |
224 | "associated station %pM\n", |
225 | tx->dev->name, hdr->addr1); | |
e2ebc74d JB |
226 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
227 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 228 | return TX_DROP; |
e2ebc74d JB |
229 | } |
230 | } else { | |
358c8d9d | 231 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 232 | tx->local->num_sta == 0 && |
05c914fe | 233 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
234 | /* |
235 | * No associated STAs - no need to send multicast | |
236 | * frames. | |
237 | */ | |
9ae54c84 | 238 | return TX_DROP; |
e2ebc74d | 239 | } |
9ae54c84 | 240 | return TX_CONTINUE; |
e2ebc74d JB |
241 | } |
242 | ||
9ae54c84 | 243 | return TX_CONTINUE; |
e2ebc74d JB |
244 | } |
245 | ||
e2ebc74d JB |
246 | /* This function is called whenever the AP is about to exceed the maximum limit |
247 | * of buffered frames for power saving STAs. This situation should not really | |
248 | * happen often during normal operation, so dropping the oldest buffered packet | |
249 | * from each queue should be OK to make some room for new frames. */ | |
250 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
251 | { | |
252 | int total = 0, purged = 0; | |
253 | struct sk_buff *skb; | |
254 | struct ieee80211_sub_if_data *sdata; | |
255 | struct sta_info *sta; | |
256 | ||
79010420 JB |
257 | /* |
258 | * virtual interfaces are protected by RCU | |
259 | */ | |
260 | rcu_read_lock(); | |
261 | ||
262 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 263 | struct ieee80211_if_ap *ap; |
05c914fe | 264 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
265 | continue; |
266 | ap = &sdata->u.ap; | |
267 | skb = skb_dequeue(&ap->ps_bc_buf); | |
268 | if (skb) { | |
269 | purged++; | |
270 | dev_kfree_skb(skb); | |
271 | } | |
272 | total += skb_queue_len(&ap->ps_bc_buf); | |
273 | } | |
e2ebc74d | 274 | |
d0709a65 | 275 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
276 | skb = skb_dequeue(&sta->ps_tx_buf); |
277 | if (skb) { | |
278 | purged++; | |
279 | dev_kfree_skb(skb); | |
280 | } | |
281 | total += skb_queue_len(&sta->ps_tx_buf); | |
282 | } | |
d0709a65 JB |
283 | |
284 | rcu_read_unlock(); | |
e2ebc74d JB |
285 | |
286 | local->total_ps_buffered = total; | |
54223995 | 287 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 288 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 289 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 290 | #endif |
e2ebc74d JB |
291 | } |
292 | ||
9ae54c84 | 293 | static ieee80211_tx_result |
5cf121c3 | 294 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 295 | { |
e039fa4a | 296 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 297 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 298 | |
7d54d0dd JB |
299 | /* |
300 | * broadcast/multicast frame | |
301 | * | |
302 | * If any of the associated stations is in power save mode, | |
303 | * the frame is buffered to be sent after DTIM beacon frame. | |
304 | * This is done either by the hardware or us. | |
305 | */ | |
306 | ||
3e122be0 JB |
307 | /* powersaving STAs only in AP/VLAN mode */ |
308 | if (!tx->sdata->bss) | |
309 | return TX_CONTINUE; | |
310 | ||
311 | /* no buffering for ordered frames */ | |
358c8d9d | 312 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 313 | return TX_CONTINUE; |
7d54d0dd JB |
314 | |
315 | /* no stations in PS mode */ | |
316 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 317 | return TX_CONTINUE; |
7d54d0dd JB |
318 | |
319 | /* buffered in mac80211 */ | |
320 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
321 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
322 | purge_old_ps_buffers(tx->local); | |
323 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
324 | AP_MAX_BC_BUFFER) { | |
54223995 | 325 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d JB |
326 | if (net_ratelimit()) { |
327 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
328 | "dropping the oldest frame\n", | |
329 | tx->dev->name); | |
330 | } | |
f4ea83dd | 331 | #endif |
e2ebc74d JB |
332 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
333 | } else | |
334 | tx->local->total_ps_buffered++; | |
335 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 336 | return TX_QUEUED; |
e2ebc74d JB |
337 | } |
338 | ||
7d54d0dd | 339 | /* buffered in hardware */ |
e039fa4a | 340 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 341 | |
9ae54c84 | 342 | return TX_CONTINUE; |
e2ebc74d JB |
343 | } |
344 | ||
fb733336 JM |
345 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
346 | struct sk_buff *skb) | |
347 | { | |
348 | if (!ieee80211_is_mgmt(fc)) | |
349 | return 0; | |
350 | ||
351 | if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) | |
352 | return 0; | |
353 | ||
354 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) | |
355 | skb->data)) | |
356 | return 0; | |
357 | ||
358 | return 1; | |
359 | } | |
360 | ||
9ae54c84 | 361 | static ieee80211_tx_result |
5cf121c3 | 362 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
363 | { |
364 | struct sta_info *sta = tx->sta; | |
e039fa4a | 365 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 366 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
07346f81 | 367 | u32 staflags; |
e2ebc74d | 368 | |
358c8d9d | 369 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control))) |
9ae54c84 | 370 | return TX_CONTINUE; |
e2ebc74d | 371 | |
07346f81 JB |
372 | staflags = get_sta_flags(sta); |
373 | ||
374 | if (unlikely((staflags & WLAN_STA_PS) && | |
375 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 376 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 377 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
e2ebc74d | 378 | "before %d)\n", |
0c68ae26 | 379 | sta->sta.addr, sta->sta.aid, |
e2ebc74d JB |
380 | skb_queue_len(&sta->ps_tx_buf)); |
381 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
382 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
383 | purge_old_ps_buffers(tx->local); | |
384 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
385 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 386 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 387 | if (net_ratelimit()) { |
0c68ae26 | 388 | printk(KERN_DEBUG "%s: STA %pM TX " |
e2ebc74d | 389 | "buffer full - dropping oldest frame\n", |
0c68ae26 | 390 | tx->dev->name, sta->sta.addr); |
e2ebc74d | 391 | } |
f4ea83dd | 392 | #endif |
e2ebc74d JB |
393 | dev_kfree_skb(old); |
394 | } else | |
395 | tx->local->total_ps_buffered++; | |
004c872e | 396 | |
e2ebc74d | 397 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
398 | if (skb_queue_empty(&sta->ps_tx_buf)) |
399 | sta_info_set_tim_bit(sta); | |
400 | ||
e039fa4a | 401 | info->control.jiffies = jiffies; |
e2ebc74d | 402 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 403 | return TX_QUEUED; |
e2ebc74d JB |
404 | } |
405 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 406 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0c68ae26 | 407 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
e2ebc74d | 408 | "set -> send frame\n", tx->dev->name, |
0c68ae26 | 409 | sta->sta.addr); |
e2ebc74d JB |
410 | } |
411 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
fef99929 CL |
412 | if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) { |
413 | /* | |
414 | * The sleeping station with pending data is now snoozing. | |
415 | * It queried us for its buffered frames and will go back | |
416 | * to deep sleep once it got everything. | |
417 | * | |
418 | * inform the driver, in case the hardware does powersave | |
419 | * frame filtering and keeps a station blacklist on its own | |
420 | * (e.g: p54), so that frames can be delivered unimpeded. | |
421 | * | |
422 | * Note: It should be save to disable the filter now. | |
423 | * As, it is really unlikely that we still have any pending | |
424 | * frame for this station in the hw's buffers/fifos left, | |
425 | * that is not rejected with a unsuccessful tx_status yet. | |
426 | */ | |
e2ebc74d | 427 | |
fef99929 CL |
428 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
429 | } | |
9ae54c84 | 430 | return TX_CONTINUE; |
e2ebc74d JB |
431 | } |
432 | ||
d9e8a70f | 433 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 434 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 435 | { |
5cf121c3 | 436 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 437 | return TX_CONTINUE; |
e2ebc74d | 438 | |
5cf121c3 | 439 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
440 | return ieee80211_tx_h_unicast_ps_buf(tx); |
441 | else | |
442 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
443 | } | |
444 | ||
d9e8a70f | 445 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 446 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 447 | { |
d4e46a3d | 448 | struct ieee80211_key *key; |
e039fa4a | 449 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 450 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 451 | |
d0f09804 | 452 | if (unlikely(tx->skb->do_not_encrypt)) |
e2ebc74d | 453 | tx->key = NULL; |
d4e46a3d JB |
454 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
455 | tx->key = key; | |
3cfcf6ac JM |
456 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
457 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) | |
458 | tx->key = key; | |
d4e46a3d JB |
459 | else if ((key = rcu_dereference(tx->sdata->default_key))) |
460 | tx->key = key; | |
e2ebc74d | 461 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 462 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e0463f50 JM |
463 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
464 | (!ieee80211_is_robust_mgmt_frame(hdr) || | |
465 | (ieee80211_is_action(hdr->frame_control) && | |
466 | tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { | |
e2ebc74d | 467 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 468 | return TX_DROP; |
176e4f84 | 469 | } else |
e2ebc74d JB |
470 | tx->key = NULL; |
471 | ||
472 | if (tx->key) { | |
473 | tx->key->tx_rx_count++; | |
011bfcc4 | 474 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
475 | |
476 | switch (tx->key->conf.alg) { | |
477 | case ALG_WEP: | |
358c8d9d | 478 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
479 | break; |
480 | case ALG_TKIP: | |
358c8d9d | 481 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
482 | tx->key = NULL; |
483 | break; | |
fb733336 JM |
484 | case ALG_CCMP: |
485 | if (!ieee80211_is_data_present(hdr->frame_control) && | |
486 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
487 | tx->skb)) | |
488 | tx->key = NULL; | |
489 | break; | |
3cfcf6ac JM |
490 | case ALG_AES_CMAC: |
491 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
492 | tx->key = NULL; | |
493 | break; | |
176e4f84 | 494 | } |
e2ebc74d JB |
495 | } |
496 | ||
176e4f84 | 497 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
d0f09804 | 498 | tx->skb->do_not_encrypt = 1; |
176e4f84 | 499 | |
9ae54c84 | 500 | return TX_CONTINUE; |
e2ebc74d JB |
501 | } |
502 | ||
d9e8a70f | 503 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 504 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 505 | { |
e039fa4a | 506 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
507 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
508 | struct ieee80211_supported_band *sband; | |
509 | struct ieee80211_rate *rate; | |
510 | int i, len; | |
511 | bool inval = false, rts = false, short_preamble = false; | |
512 | struct ieee80211_tx_rate_control txrc; | |
8318d78a | 513 | |
e6a9854b | 514 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 515 | |
e6a9854b | 516 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 517 | |
e6a9854b JB |
518 | len = min_t(int, tx->skb->len + FCS_LEN, |
519 | tx->local->fragmentation_threshold); | |
520 | ||
521 | /* set up the tx rate control struct we give the RC algo */ | |
522 | txrc.hw = local_to_hw(tx->local); | |
523 | txrc.sband = sband; | |
524 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
525 | txrc.skb = tx->skb; | |
526 | txrc.reported_rate.idx = -1; | |
527 | txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx; | |
528 | ||
529 | /* set up RTS protection if desired */ | |
530 | if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD && | |
531 | len > tx->local->rts_threshold) { | |
532 | txrc.rts = rts = true; | |
e2ebc74d | 533 | } |
e2ebc74d | 534 | |
e6a9854b JB |
535 | /* |
536 | * Use short preamble if the BSS can handle it, but not for | |
537 | * management frames unless we know the receiver can handle | |
538 | * that -- the management frame might be to a station that | |
539 | * just wants a probe response. | |
540 | */ | |
541 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
542 | (ieee80211_is_data(hdr->frame_control) || | |
543 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
544 | txrc.short_preamble = short_preamble = true; | |
e2ebc74d | 545 | |
2e92e6f2 | 546 | |
e6a9854b JB |
547 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
548 | ||
549 | if (unlikely(info->control.rates[0].idx < 0)) | |
550 | return TX_DROP; | |
551 | ||
552 | if (txrc.reported_rate.idx < 0) | |
553 | txrc.reported_rate = info->control.rates[0]; | |
e2ebc74d | 554 | |
e039fa4a | 555 | if (tx->sta) |
e6a9854b | 556 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 557 | |
e6a9854b JB |
558 | if (unlikely(!info->control.rates[0].count)) |
559 | info->control.rates[0].count = 1; | |
e2ebc74d | 560 | |
e6a9854b JB |
561 | if (is_multicast_ether_addr(hdr->addr1)) { |
562 | /* | |
563 | * XXX: verify the rate is in the basic rateset | |
564 | */ | |
565 | return TX_CONTINUE; | |
e2ebc74d JB |
566 | } |
567 | ||
e6a9854b JB |
568 | /* |
569 | * set up the RTS/CTS rate as the fastest basic rate | |
570 | * that is not faster than the data rate | |
571 | * | |
572 | * XXX: Should this check all retry rates? | |
573 | */ | |
574 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
575 | s8 baserate = 0; | |
576 | ||
577 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
578 | ||
579 | for (i = 0; i < sband->n_bitrates; i++) { | |
580 | /* must be a basic rate */ | |
581 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
582 | continue; | |
583 | /* must not be faster than the data rate */ | |
584 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
585 | continue; | |
586 | /* maximum */ | |
587 | if (sband->bitrates[baserate].bitrate < | |
588 | sband->bitrates[i].bitrate) | |
589 | baserate = i; | |
590 | } | |
591 | ||
592 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
593 | } |
594 | ||
e6a9854b JB |
595 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
596 | /* | |
597 | * make sure there's no valid rate following | |
598 | * an invalid one, just in case drivers don't | |
599 | * take the API seriously to stop at -1. | |
600 | */ | |
601 | if (inval) { | |
602 | info->control.rates[i].idx = -1; | |
603 | continue; | |
604 | } | |
605 | if (info->control.rates[i].idx < 0) { | |
606 | inval = true; | |
607 | continue; | |
608 | } | |
8318d78a | 609 | |
e6a9854b JB |
610 | /* |
611 | * For now assume MCS is already set up correctly, this | |
612 | * needs to be fixed. | |
613 | */ | |
614 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
615 | WARN_ON(info->control.rates[i].idx > 76); | |
616 | continue; | |
617 | } | |
e2ebc74d | 618 | |
e6a9854b JB |
619 | /* set up RTS protection if desired */ |
620 | if (rts) | |
621 | info->control.rates[i].flags |= | |
622 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 623 | |
e6a9854b | 624 | /* RC is busted */ |
075cbc9e S |
625 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
626 | sband->n_bitrates)) { | |
e6a9854b JB |
627 | info->control.rates[i].idx = -1; |
628 | continue; | |
8318d78a | 629 | } |
e2ebc74d | 630 | |
e6a9854b JB |
631 | rate = &sband->bitrates[info->control.rates[i].idx]; |
632 | ||
633 | /* set up short preamble */ | |
634 | if (short_preamble && | |
635 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
636 | info->control.rates[i].flags |= | |
637 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
638 | ||
639 | /* set up G protection */ | |
640 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
641 | rate->flags & IEEE80211_RATE_ERP_G) | |
642 | info->control.rates[i].flags |= | |
643 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
644 | } |
645 | ||
e6a9854b JB |
646 | return TX_CONTINUE; |
647 | } | |
648 | ||
649 | static ieee80211_tx_result debug_noinline | |
650 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) | |
651 | { | |
652 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
653 | ||
e2454948 | 654 | if (tx->sta) |
17741cdc | 655 | info->control.sta = &tx->sta->sta; |
e2454948 JB |
656 | |
657 | return TX_CONTINUE; | |
658 | } | |
659 | ||
f591fa5d JB |
660 | static ieee80211_tx_result debug_noinline |
661 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
662 | { | |
663 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
664 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
665 | u16 *seq; | |
666 | u8 *qc; | |
667 | int tid; | |
668 | ||
25d834e1 JB |
669 | /* |
670 | * Packet injection may want to control the sequence | |
671 | * number, if we have no matching interface then we | |
672 | * neither assign one ourselves nor ask the driver to. | |
673 | */ | |
674 | if (unlikely(!info->control.vif)) | |
675 | return TX_CONTINUE; | |
676 | ||
f591fa5d JB |
677 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
678 | return TX_CONTINUE; | |
679 | ||
680 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
681 | return TX_CONTINUE; | |
682 | ||
94778280 JB |
683 | /* |
684 | * Anything but QoS data that has a sequence number field | |
685 | * (is long enough) gets a sequence number from the global | |
686 | * counter. | |
687 | */ | |
f591fa5d | 688 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 689 | /* driver should assign sequence number */ |
f591fa5d | 690 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
691 | /* for pure STA mode without beacons, we can do it */ |
692 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
693 | tx->sdata->sequence_number += 0x10; | |
694 | tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ; | |
f591fa5d JB |
695 | return TX_CONTINUE; |
696 | } | |
697 | ||
698 | /* | |
699 | * This should be true for injected/management frames only, for | |
700 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
701 | * above since they are not QoS-data frames. | |
702 | */ | |
703 | if (!tx->sta) | |
704 | return TX_CONTINUE; | |
705 | ||
706 | /* include per-STA, per-TID sequence counter */ | |
707 | ||
708 | qc = ieee80211_get_qos_ctl(hdr); | |
709 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
710 | seq = &tx->sta->tid_seq[tid]; | |
711 | ||
712 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
713 | ||
714 | /* Increase the sequence number. */ | |
715 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
716 | ||
717 | return TX_CONTINUE; | |
718 | } | |
719 | ||
2de8e0d9 JB |
720 | static int ieee80211_fragment(struct ieee80211_local *local, |
721 | struct sk_buff *skb, int hdrlen, | |
722 | int frag_threshold) | |
723 | { | |
724 | struct sk_buff *tail = skb, *tmp; | |
725 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
726 | int pos = hdrlen + per_fragm; | |
727 | int rem = skb->len - hdrlen - per_fragm; | |
728 | ||
729 | if (WARN_ON(rem < 0)) | |
730 | return -EINVAL; | |
731 | ||
732 | while (rem) { | |
733 | int fraglen = per_fragm; | |
734 | ||
735 | if (fraglen > rem) | |
736 | fraglen = rem; | |
737 | rem -= fraglen; | |
738 | tmp = dev_alloc_skb(local->tx_headroom + | |
739 | frag_threshold + | |
740 | IEEE80211_ENCRYPT_HEADROOM + | |
741 | IEEE80211_ENCRYPT_TAILROOM); | |
742 | if (!tmp) | |
743 | return -ENOMEM; | |
744 | tail->next = tmp; | |
745 | tail = tmp; | |
746 | skb_reserve(tmp, local->tx_headroom + | |
747 | IEEE80211_ENCRYPT_HEADROOM); | |
748 | /* copy control information */ | |
749 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); | |
750 | skb_copy_queue_mapping(tmp, skb); | |
751 | tmp->priority = skb->priority; | |
752 | tmp->do_not_encrypt = skb->do_not_encrypt; | |
753 | tmp->dev = skb->dev; | |
754 | tmp->iif = skb->iif; | |
755 | ||
756 | /* copy header and data */ | |
757 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); | |
758 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); | |
759 | ||
760 | pos += fraglen; | |
761 | } | |
762 | ||
763 | skb->len = hdrlen + per_fragm; | |
764 | return 0; | |
765 | } | |
766 | ||
d9e8a70f | 767 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
768 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
769 | { | |
2de8e0d9 JB |
770 | struct sk_buff *skb = tx->skb; |
771 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
772 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
e2454948 | 773 | int frag_threshold = tx->local->fragmentation_threshold; |
2de8e0d9 JB |
774 | int hdrlen; |
775 | int fragnum; | |
e2454948 JB |
776 | |
777 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
778 | return TX_CONTINUE; | |
779 | ||
eefce91a JB |
780 | /* |
781 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
782 | * This scenario is handled in __ieee80211_tx_prepare but extra |
783 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a | 784 | */ |
8b30b1fe | 785 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
786 | return TX_DROP; |
787 | ||
065e9605 | 788 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 | 789 | |
2de8e0d9 JB |
790 | /* internal error, why is TX_FRAGMENTED set? */ |
791 | if (WARN_ON(skb->len <= frag_threshold)) | |
792 | return TX_DROP; | |
e6a9854b | 793 | |
2de8e0d9 JB |
794 | /* |
795 | * Now fragment the frame. This will allocate all the fragments and | |
796 | * chain them (using skb as the first fragment) to skb->next. | |
797 | * During transmission, we will remove the successfully transmitted | |
798 | * fragments from this list. When the low-level driver rejects one | |
799 | * of the fragments then we will simply pretend to accept the skb | |
800 | * but store it away as pending. | |
801 | */ | |
802 | if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) | |
803 | return TX_DROP; | |
e6a9854b | 804 | |
2de8e0d9 JB |
805 | /* update duration/seq/flags of fragments */ |
806 | fragnum = 0; | |
807 | do { | |
808 | int next_len; | |
809 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
e6a9854b | 810 | |
2de8e0d9 JB |
811 | hdr = (void *)skb->data; |
812 | info = IEEE80211_SKB_CB(skb); | |
e6a9854b | 813 | |
2de8e0d9 JB |
814 | if (skb->next) { |
815 | hdr->frame_control |= morefrags; | |
816 | next_len = skb->next->len; | |
e6a9854b JB |
817 | /* |
818 | * No multi-rate retries for fragmented frames, that | |
819 | * would completely throw off the NAV at other STAs. | |
820 | */ | |
821 | info->control.rates[1].idx = -1; | |
822 | info->control.rates[2].idx = -1; | |
823 | info->control.rates[3].idx = -1; | |
824 | info->control.rates[4].idx = -1; | |
825 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
826 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
2de8e0d9 JB |
827 | } else { |
828 | hdr->frame_control &= ~morefrags; | |
829 | next_len = 0; | |
e6a9854b | 830 | } |
2de8e0d9 JB |
831 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); |
832 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); | |
833 | fragnum++; | |
834 | } while ((skb = skb->next)); | |
e2ebc74d | 835 | |
9ae54c84 | 836 | return TX_CONTINUE; |
e2ebc74d JB |
837 | } |
838 | ||
d9e8a70f | 839 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
840 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
841 | { | |
842 | if (!tx->key) | |
843 | return TX_CONTINUE; | |
844 | ||
845 | switch (tx->key->conf.alg) { | |
846 | case ALG_WEP: | |
847 | return ieee80211_crypto_wep_encrypt(tx); | |
848 | case ALG_TKIP: | |
849 | return ieee80211_crypto_tkip_encrypt(tx); | |
850 | case ALG_CCMP: | |
851 | return ieee80211_crypto_ccmp_encrypt(tx); | |
3cfcf6ac JM |
852 | case ALG_AES_CMAC: |
853 | return ieee80211_crypto_aes_cmac_encrypt(tx); | |
e2454948 JB |
854 | } |
855 | ||
856 | /* not reached */ | |
857 | WARN_ON(1); | |
858 | return TX_DROP; | |
859 | } | |
860 | ||
d9e8a70f | 861 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
862 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
863 | { | |
2de8e0d9 JB |
864 | struct sk_buff *skb = tx->skb; |
865 | struct ieee80211_hdr *hdr; | |
866 | int next_len; | |
867 | bool group_addr; | |
03f93c3d | 868 | |
2de8e0d9 JB |
869 | do { |
870 | hdr = (void *) skb->data; | |
871 | next_len = skb->next ? skb->next->len : 0; | |
872 | group_addr = is_multicast_ether_addr(hdr->addr1); | |
03f93c3d | 873 | |
2de8e0d9 JB |
874 | hdr->duration_id = |
875 | ieee80211_duration(tx, group_addr, next_len); | |
876 | } while ((skb = skb->next)); | |
03f93c3d JB |
877 | |
878 | return TX_CONTINUE; | |
879 | } | |
880 | ||
d9e8a70f | 881 | static ieee80211_tx_result debug_noinline |
e2454948 | 882 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 883 | { |
2de8e0d9 | 884 | struct sk_buff *skb = tx->skb; |
e2ebc74d | 885 | |
9e72ebd6 JB |
886 | if (!tx->sta) |
887 | return TX_CONTINUE; | |
e2ebc74d | 888 | |
9e72ebd6 | 889 | tx->sta->tx_packets++; |
2de8e0d9 JB |
890 | do { |
891 | tx->sta->tx_fragments++; | |
892 | tx->sta->tx_bytes += skb->len; | |
893 | } while ((skb = skb->next)); | |
e2454948 | 894 | |
9ae54c84 | 895 | return TX_CONTINUE; |
e2ebc74d JB |
896 | } |
897 | ||
e2ebc74d JB |
898 | /* actual transmit path */ |
899 | ||
900 | /* | |
901 | * deal with packet injection down monitor interface | |
902 | * with Radiotap Header -- only called for monitor mode interface | |
903 | */ | |
9ae54c84 | 904 | static ieee80211_tx_result |
5cf121c3 | 905 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 906 | struct sk_buff *skb) |
e2ebc74d JB |
907 | { |
908 | /* | |
909 | * this is the moment to interpret and discard the radiotap header that | |
910 | * must be at the start of the packet injected in Monitor mode | |
911 | * | |
912 | * Need to take some care with endian-ness since radiotap | |
913 | * args are little-endian | |
914 | */ | |
915 | ||
916 | struct ieee80211_radiotap_iterator iterator; | |
917 | struct ieee80211_radiotap_header *rthdr = | |
918 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 919 | struct ieee80211_supported_band *sband; |
e2ebc74d JB |
920 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
921 | ||
2e92e6f2 | 922 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 923 | |
d0f09804 | 924 | skb->do_not_encrypt = 1; |
5cf121c3 | 925 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
926 | |
927 | /* | |
928 | * for every radiotap entry that is present | |
929 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
930 | * entries present, or -EINVAL on error) | |
931 | */ | |
932 | ||
933 | while (!ret) { | |
e2ebc74d JB |
934 | ret = ieee80211_radiotap_iterator_next(&iterator); |
935 | ||
936 | if (ret) | |
937 | continue; | |
938 | ||
939 | /* see if this argument is something we can use */ | |
940 | switch (iterator.this_arg_index) { | |
941 | /* | |
942 | * You must take care when dereferencing iterator.this_arg | |
943 | * for multibyte types... the pointer is not aligned. Use | |
944 | * get_unaligned((type *)iterator.this_arg) to dereference | |
945 | * iterator.this_arg for type "type" safely on all arches. | |
946 | */ | |
e2ebc74d JB |
947 | case IEEE80211_RADIOTAP_FLAGS: |
948 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
949 | /* | |
950 | * this indicates that the skb we have been | |
951 | * handed has the 32-bit FCS CRC at the end... | |
952 | * we should react to that by snipping it off | |
953 | * because it will be recomputed and added | |
954 | * on transmission | |
955 | */ | |
956 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 957 | return TX_DROP; |
e2ebc74d JB |
958 | |
959 | skb_trim(skb, skb->len - FCS_LEN); | |
960 | } | |
58d4185e | 961 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 962 | tx->skb->do_not_encrypt = 0; |
58d4185e | 963 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 964 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
965 | break; |
966 | ||
58d4185e JB |
967 | /* |
968 | * Please update the file | |
969 | * Documentation/networking/mac80211-injection.txt | |
970 | * when parsing new fields here. | |
971 | */ | |
972 | ||
e2ebc74d JB |
973 | default: |
974 | break; | |
975 | } | |
976 | } | |
977 | ||
978 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 979 | return TX_DROP; |
e2ebc74d JB |
980 | |
981 | /* | |
982 | * remove the radiotap header | |
983 | * iterator->max_length was sanity-checked against | |
984 | * skb->len by iterator init | |
985 | */ | |
986 | skb_pull(skb, iterator.max_length); | |
987 | ||
9ae54c84 | 988 | return TX_CONTINUE; |
e2ebc74d JB |
989 | } |
990 | ||
58d4185e JB |
991 | /* |
992 | * initialises @tx | |
993 | */ | |
9ae54c84 | 994 | static ieee80211_tx_result |
5cf121c3 | 995 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 996 | struct sk_buff *skb, |
e039fa4a | 997 | struct net_device *dev) |
e2ebc74d JB |
998 | { |
999 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 1000 | struct ieee80211_hdr *hdr; |
e2ebc74d | 1001 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 1002 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8b30b1fe S |
1003 | int hdrlen, tid; |
1004 | u8 *qc, *state; | |
cd8ffc80 | 1005 | bool queued = false; |
e2ebc74d JB |
1006 | |
1007 | memset(tx, 0, sizeof(*tx)); | |
1008 | tx->skb = skb; | |
1009 | tx->dev = dev; /* use original interface */ | |
1010 | tx->local = local; | |
1011 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 1012 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 1013 | /* |
58d4185e JB |
1014 | * Set this flag (used below to indicate "automatic fragmentation"), |
1015 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 1016 | */ |
5cf121c3 | 1017 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1018 | |
1019 | /* process and remove the injection radiotap header */ | |
1020 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
25d834e1 | 1021 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
9ae54c84 JB |
1022 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
1023 | return TX_DROP; | |
58d4185e | 1024 | |
e2ebc74d | 1025 | /* |
58d4185e JB |
1026 | * __ieee80211_parse_tx_radiotap has now removed |
1027 | * the radiotap header that was present and pre-filled | |
1028 | * 'tx' with tx control information. | |
e2ebc74d | 1029 | */ |
e2ebc74d JB |
1030 | } |
1031 | ||
cd8ffc80 JB |
1032 | /* |
1033 | * If this flag is set to true anywhere, and we get here, | |
1034 | * we are doing the needed processing, so remove the flag | |
1035 | * now. | |
1036 | */ | |
1037 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1038 | ||
58d4185e JB |
1039 | hdr = (struct ieee80211_hdr *) skb->data; |
1040 | ||
24338793 | 1041 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 1042 | |
cd8ffc80 JB |
1043 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
1044 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { | |
96f5e66e | 1045 | unsigned long flags; |
cd8ffc80 JB |
1046 | struct tid_ampdu_tx *tid_tx; |
1047 | ||
8b30b1fe S |
1048 | qc = ieee80211_get_qos_ctl(hdr); |
1049 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1050 | ||
96f5e66e | 1051 | spin_lock_irqsave(&tx->sta->lock, flags); |
cd8ffc80 JB |
1052 | /* |
1053 | * XXX: This spinlock could be fairly expensive, but see the | |
1054 | * comment in agg-tx.c:ieee80211_agg_tx_operational(). | |
1055 | * One way to solve this would be to do something RCU-like | |
1056 | * for managing the tid_tx struct and using atomic bitops | |
1057 | * for the actual state -- by introducing an actual | |
1058 | * 'operational' bit that would be possible. It would | |
1059 | * require changing ieee80211_agg_tx_operational() to | |
1060 | * set that bit, and changing the way tid_tx is managed | |
1061 | * everywhere, including races between that bit and | |
1062 | * tid_tx going away (tid_tx being added can be easily | |
1063 | * committed to memory before the 'operational' bit). | |
1064 | */ | |
1065 | tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; | |
8b30b1fe | 1066 | state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; |
cd8ffc80 | 1067 | if (*state == HT_AGG_STATE_OPERATIONAL) { |
8b30b1fe | 1068 | info->flags |= IEEE80211_TX_CTL_AMPDU; |
cd8ffc80 JB |
1069 | } else if (*state != HT_AGG_STATE_IDLE) { |
1070 | /* in progress */ | |
1071 | queued = true; | |
1072 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1073 | __skb_queue_tail(&tid_tx->pending, skb); | |
1074 | } | |
96f5e66e | 1075 | spin_unlock_irqrestore(&tx->sta->lock, flags); |
cd8ffc80 JB |
1076 | |
1077 | if (unlikely(queued)) | |
1078 | return TX_QUEUED; | |
8b30b1fe S |
1079 | } |
1080 | ||
badffb72 | 1081 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1082 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1083 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1084 | } else { |
5cf121c3 | 1085 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 1086 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1087 | } |
58d4185e | 1088 | |
5cf121c3 JB |
1089 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1090 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 1091 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 | 1092 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
5cf121c3 | 1093 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1094 | else |
5cf121c3 | 1095 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1096 | } |
1097 | ||
e2ebc74d | 1098 | if (!tx->sta) |
e039fa4a | 1099 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1100 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1101 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1102 | |
b73d70ad | 1103 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1104 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1105 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1106 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1107 | } | |
e039fa4a | 1108 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1109 | |
9ae54c84 | 1110 | return TX_CONTINUE; |
e2ebc74d JB |
1111 | } |
1112 | ||
32bfd35d | 1113 | /* |
58d4185e JB |
1114 | * NB: @tx is uninitialised when passed in here |
1115 | */ | |
133b8226 JB |
1116 | static int ieee80211_tx_prepare(struct ieee80211_local *local, |
1117 | struct ieee80211_tx_data *tx, | |
1118 | struct sk_buff *skb) | |
e2ebc74d | 1119 | { |
e2ebc74d JB |
1120 | struct net_device *dev; |
1121 | ||
d0f09804 | 1122 | dev = dev_get_by_index(&init_net, skb->iif); |
133b8226 | 1123 | if (unlikely(dev && !is_ieee80211_device(local, dev))) { |
e2ebc74d JB |
1124 | dev_put(dev); |
1125 | dev = NULL; | |
1126 | } | |
1127 | if (unlikely(!dev)) | |
1128 | return -ENODEV; | |
cd8ffc80 JB |
1129 | /* |
1130 | * initialises tx with control | |
1131 | * | |
1132 | * return value is safe to ignore here because this function | |
1133 | * can only be invoked for multicast frames | |
1134 | * | |
1135 | * XXX: clean up | |
1136 | */ | |
e039fa4a | 1137 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1138 | dev_put(dev); |
e2ebc74d JB |
1139 | return 0; |
1140 | } | |
1141 | ||
2de8e0d9 | 1142 | static int __ieee80211_tx(struct ieee80211_local *local, |
1870cd71 JB |
1143 | struct sk_buff **skbp, |
1144 | struct sta_info *sta) | |
e2ebc74d | 1145 | { |
1870cd71 | 1146 | struct sk_buff *skb = *skbp, *next; |
f8e79ddd | 1147 | struct ieee80211_tx_info *info; |
a220858d | 1148 | int ret, len; |
2de8e0d9 | 1149 | bool fragm = false; |
e2ebc74d | 1150 | |
2de8e0d9 JB |
1151 | local->mdev->trans_start = jiffies; |
1152 | ||
1153 | while (skb) { | |
96f5e66e JB |
1154 | if (ieee80211_queue_stopped(&local->hw, |
1155 | skb_get_queue_mapping(skb))) | |
97d97b80 | 1156 | return IEEE80211_TX_PENDING; |
f8e79ddd | 1157 | |
f0e72851 JB |
1158 | info = IEEE80211_SKB_CB(skb); |
1159 | ||
1160 | if (fragm) | |
e6a9854b | 1161 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1162 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
f0e72851 | 1163 | |
2de8e0d9 | 1164 | next = skb->next; |
a220858d | 1165 | len = skb->len; |
2de8e0d9 | 1166 | ret = local->ops->tx(local_to_hw(local), skb); |
a220858d JB |
1167 | if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { |
1168 | dev_kfree_skb(skb); | |
1169 | ret = NETDEV_TX_OK; | |
1170 | } | |
2de8e0d9 JB |
1171 | if (ret != NETDEV_TX_OK) |
1172 | return IEEE80211_TX_AGAIN; | |
1870cd71 | 1173 | *skbp = skb = next; |
2de8e0d9 JB |
1174 | ieee80211_led_tx(local, 1); |
1175 | fragm = true; | |
e2ebc74d | 1176 | } |
2de8e0d9 | 1177 | |
e2ebc74d JB |
1178 | return IEEE80211_TX_OK; |
1179 | } | |
1180 | ||
97b045d6 JB |
1181 | /* |
1182 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1183 | * frame was dropped or queued. | |
1184 | */ | |
1185 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1186 | { | |
97b045d6 | 1187 | struct sk_buff *skb = tx->skb; |
97b045d6 | 1188 | ieee80211_tx_result res = TX_DROP; |
97b045d6 | 1189 | |
d9e8a70f JB |
1190 | #define CALL_TXH(txh) \ |
1191 | res = txh(tx); \ | |
1192 | if (res != TX_CONTINUE) \ | |
1193 | goto txh_done; | |
1194 | ||
1195 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1196 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1197 | CALL_TXH(ieee80211_tx_h_select_key) | |
1198 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1199 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1200 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1201 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1202 | CALL_TXH(ieee80211_tx_h_fragment) |
1203 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1204 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1205 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1206 | CALL_TXH(ieee80211_tx_h_stats) | |
1207 | #undef CALL_TXH | |
97b045d6 | 1208 | |
d9e8a70f | 1209 | txh_done: |
97b045d6 | 1210 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1211 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
2de8e0d9 JB |
1212 | while (skb) { |
1213 | struct sk_buff *next; | |
1214 | ||
1215 | next = skb->next; | |
1216 | dev_kfree_skb(skb); | |
1217 | skb = next; | |
1218 | } | |
97b045d6 JB |
1219 | return -1; |
1220 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1221 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1222 | return -1; |
1223 | } | |
1224 | ||
1225 | return 0; | |
1226 | } | |
1227 | ||
cd8ffc80 JB |
1228 | static void ieee80211_tx(struct net_device *dev, struct sk_buff *skb, |
1229 | bool txpending) | |
e2ebc74d JB |
1230 | { |
1231 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1232 | struct sta_info *sta; | |
5cf121c3 | 1233 | struct ieee80211_tx_data tx; |
97b045d6 | 1234 | ieee80211_tx_result res_prepare; |
e039fa4a | 1235 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2a577d98 JB |
1236 | struct sk_buff *next; |
1237 | unsigned long flags; | |
1238 | int ret, retries; | |
e2530083 | 1239 | u16 queue; |
e2ebc74d | 1240 | |
e2530083 JB |
1241 | queue = skb_get_queue_mapping(skb); |
1242 | ||
cd8ffc80 | 1243 | WARN_ON(!txpending && !skb_queue_empty(&local->pending[queue])); |
e2ebc74d JB |
1244 | |
1245 | if (unlikely(skb->len < 10)) { | |
1246 | dev_kfree_skb(skb); | |
cd8ffc80 | 1247 | return; |
e2ebc74d JB |
1248 | } |
1249 | ||
d0709a65 JB |
1250 | rcu_read_lock(); |
1251 | ||
58d4185e | 1252 | /* initialises tx */ |
e039fa4a | 1253 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1254 | |
cd8ffc80 | 1255 | if (unlikely(res_prepare == TX_DROP)) { |
e2ebc74d | 1256 | dev_kfree_skb(skb); |
d0709a65 | 1257 | rcu_read_unlock(); |
cd8ffc80 JB |
1258 | return; |
1259 | } else if (unlikely(res_prepare == TX_QUEUED)) { | |
1260 | rcu_read_unlock(); | |
1261 | return; | |
e2ebc74d JB |
1262 | } |
1263 | ||
1264 | sta = tx.sta; | |
5cf121c3 | 1265 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1266 | info->band = tx.channel->band; |
e2ebc74d | 1267 | |
97b045d6 JB |
1268 | if (invoke_tx_handlers(&tx)) |
1269 | goto out; | |
e2ebc74d | 1270 | |
2a577d98 JB |
1271 | retries = 0; |
1272 | retry: | |
1870cd71 | 1273 | ret = __ieee80211_tx(local, &tx.skb, tx.sta); |
2a577d98 JB |
1274 | switch (ret) { |
1275 | case IEEE80211_TX_OK: | |
1276 | break; | |
1277 | case IEEE80211_TX_AGAIN: | |
eefce91a JB |
1278 | /* |
1279 | * Since there are no fragmented frames on A-MPDU | |
1280 | * queues, there's no reason for a driver to reject | |
1281 | * a frame there, warn and drop it. | |
1282 | */ | |
2a577d98 JB |
1283 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
1284 | goto drop; | |
1285 | /* fall through */ | |
1286 | case IEEE80211_TX_PENDING: | |
1287 | skb = tx.skb; | |
eefce91a | 1288 | |
2a577d98 | 1289 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
e2ebc74d | 1290 | |
2a577d98 JB |
1291 | if (__netif_subqueue_stopped(local->mdev, queue)) { |
1292 | do { | |
1293 | next = skb->next; | |
1294 | skb->next = NULL; | |
cd8ffc80 JB |
1295 | if (unlikely(txpending)) |
1296 | skb_queue_head(&local->pending[queue], | |
1297 | skb); | |
1298 | else | |
1299 | skb_queue_tail(&local->pending[queue], | |
1300 | skb); | |
2a577d98 JB |
1301 | } while ((skb = next)); |
1302 | ||
1303 | /* | |
1304 | * Make sure nobody will enable the queue on us | |
1305 | * (without going through the tasklet) nor disable the | |
1306 | * netdev queue underneath the pending handling code. | |
1307 | */ | |
1308 | __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING, | |
1309 | &local->queue_stop_reasons[queue]); | |
1310 | ||
1311 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, | |
1312 | flags); | |
1313 | } else { | |
1314 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, | |
1315 | flags); | |
1316 | ||
1317 | retries++; | |
1318 | if (WARN(retries > 10, "tx refused but queue active")) | |
1319 | goto drop; | |
e2ebc74d JB |
1320 | goto retry; |
1321 | } | |
e2ebc74d | 1322 | } |
97b045d6 | 1323 | out: |
d4e46a3d | 1324 | rcu_read_unlock(); |
cd8ffc80 | 1325 | return; |
e2ebc74d JB |
1326 | |
1327 | drop: | |
d4e46a3d | 1328 | rcu_read_unlock(); |
2de8e0d9 JB |
1329 | |
1330 | skb = tx.skb; | |
1331 | while (skb) { | |
2de8e0d9 JB |
1332 | next = skb->next; |
1333 | dev_kfree_skb(skb); | |
1334 | skb = next; | |
1335 | } | |
e2ebc74d JB |
1336 | } |
1337 | ||
1338 | /* device xmit handlers */ | |
1339 | ||
23c0752a JB |
1340 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1341 | struct sk_buff *skb, | |
1342 | int head_need, bool may_encrypt) | |
1343 | { | |
1344 | int tail_need = 0; | |
1345 | ||
1346 | /* | |
1347 | * This could be optimised, devices that do full hardware | |
1348 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1349 | * have no drivers for such devices currently. | |
1350 | */ | |
1351 | if (may_encrypt) { | |
1352 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1353 | tail_need -= skb_tailroom(skb); | |
1354 | tail_need = max_t(int, tail_need, 0); | |
1355 | } | |
1356 | ||
1357 | if (head_need || tail_need) { | |
1358 | /* Sorry. Can't account for this any more */ | |
1359 | skb_orphan(skb); | |
1360 | } | |
1361 | ||
1362 | if (skb_header_cloned(skb)) | |
1363 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1364 | else | |
1365 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1366 | ||
1367 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1368 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1369 | wiphy_name(local->hw.wiphy)); | |
1370 | return -ENOMEM; | |
1371 | } | |
1372 | ||
1373 | /* update truesize too */ | |
1374 | skb->truesize += head_need + tail_need; | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
8ef9dad3 | 1379 | int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev) |
e2ebc74d | 1380 | { |
133b8226 JB |
1381 | struct ieee80211_master_priv *mpriv = netdev_priv(dev); |
1382 | struct ieee80211_local *local = mpriv->local; | |
e039fa4a | 1383 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1384 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1385 | struct net_device *odev = NULL; |
1386 | struct ieee80211_sub_if_data *osdata; | |
1387 | int headroom; | |
23c0752a | 1388 | bool may_encrypt; |
25d834e1 JB |
1389 | enum { |
1390 | NOT_MONITOR, | |
1391 | FOUND_SDATA, | |
1392 | UNKNOWN_ADDRESS, | |
1393 | } monitor_iface = NOT_MONITOR; | |
e2ebc74d | 1394 | |
d0f09804 JB |
1395 | if (skb->iif) |
1396 | odev = dev_get_by_index(&init_net, skb->iif); | |
133b8226 | 1397 | if (unlikely(odev && !is_ieee80211_device(local, odev))) { |
e2ebc74d JB |
1398 | dev_put(odev); |
1399 | odev = NULL; | |
1400 | } | |
1401 | if (unlikely(!odev)) { | |
1402 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1403 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1404 | "originating device\n", dev->name); | |
1405 | #endif | |
1406 | dev_kfree_skb(skb); | |
cd8ffc80 | 1407 | return NETDEV_TX_OK; |
e2ebc74d | 1408 | } |
e039fa4a | 1409 | |
4be8c387 | 1410 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
46f2c4bd | 1411 | local->hw.conf.dynamic_ps_timeout > 0) { |
d063ed0f VN |
1412 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
1413 | ieee80211_stop_queues_by_reason(&local->hw, | |
1414 | IEEE80211_QUEUE_STOP_REASON_PS); | |
1415 | queue_work(local->hw.workqueue, | |
1416 | &local->dynamic_ps_disable_work); | |
1417 | } | |
1418 | ||
1419 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
46f2c4bd | 1420 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
d063ed0f VN |
1421 | } |
1422 | ||
d0f09804 JB |
1423 | memset(info, 0, sizeof(*info)); |
1424 | ||
1425 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1426 | ||
e2ebc74d JB |
1427 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1428 | ||
e32f85f7 LCC |
1429 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1430 | ieee80211_is_data(hdr->frame_control)) { | |
f74b6a54 RR |
1431 | if (is_multicast_ether_addr(hdr->addr3)) |
1432 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1433 | else | |
5dc306f3 BC |
1434 | if (mesh_nexthop_lookup(skb, osdata)) { |
1435 | dev_put(odev); | |
cd8ffc80 | 1436 | return NETDEV_TX_OK; |
5dc306f3 | 1437 | } |
f74b6a54 RR |
1438 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) |
1439 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh, | |
1440 | fwded_frames); | |
25d834e1 JB |
1441 | } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
1442 | struct ieee80211_sub_if_data *sdata; | |
25d834e1 JB |
1443 | int hdrlen; |
1444 | u16 len_rthdr; | |
1445 | ||
1446 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
1447 | monitor_iface = UNKNOWN_ADDRESS; | |
1448 | ||
1449 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1450 | hdr = (struct ieee80211_hdr *)skb->data + len_rthdr; | |
1451 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1452 | ||
1453 | /* check the header is complete in the frame */ | |
1454 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1455 | /* | |
1456 | * We process outgoing injected frames that have a | |
1457 | * local address we handle as though they are our | |
1458 | * own frames. | |
1459 | * This code here isn't entirely correct, the local | |
1460 | * MAC address is not necessarily enough to find | |
1461 | * the interface to use; for that proper VLAN/WDS | |
1462 | * support we will need a different mechanism. | |
1463 | */ | |
1464 | ||
1465 | rcu_read_lock(); | |
1466 | list_for_each_entry_rcu(sdata, &local->interfaces, | |
1467 | list) { | |
1468 | if (!netif_running(sdata->dev)) | |
1469 | continue; | |
f1b33cb1 JB |
1470 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
1471 | continue; | |
25d834e1 JB |
1472 | if (compare_ether_addr(sdata->dev->dev_addr, |
1473 | hdr->addr2)) { | |
1474 | dev_hold(sdata->dev); | |
1475 | dev_put(odev); | |
1476 | osdata = sdata; | |
1477 | odev = osdata->dev; | |
1478 | skb->iif = sdata->dev->ifindex; | |
1479 | monitor_iface = FOUND_SDATA; | |
1480 | break; | |
1481 | } | |
1482 | } | |
1483 | rcu_read_unlock(); | |
1484 | } | |
e32f85f7 LCC |
1485 | } |
1486 | ||
d0f09804 | 1487 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1488 | |
1489 | headroom = osdata->local->tx_headroom; | |
1490 | if (may_encrypt) | |
1491 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1492 | headroom -= skb_headroom(skb); | |
1493 | headroom = max_t(int, 0, headroom); | |
1494 | ||
1495 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1496 | dev_kfree_skb(skb); | |
1497 | dev_put(odev); | |
cd8ffc80 | 1498 | return NETDEV_TX_OK; |
e2ebc74d JB |
1499 | } |
1500 | ||
30613070 JB |
1501 | if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
1502 | osdata = container_of(osdata->bss, | |
1503 | struct ieee80211_sub_if_data, | |
1504 | u.ap); | |
25d834e1 JB |
1505 | if (likely(monitor_iface != UNKNOWN_ADDRESS)) |
1506 | info->control.vif = &osdata->vif; | |
cd8ffc80 JB |
1507 | |
1508 | ieee80211_tx(odev, skb, false); | |
e2ebc74d JB |
1509 | dev_put(odev); |
1510 | ||
cd8ffc80 | 1511 | return NETDEV_TX_OK; |
e2ebc74d JB |
1512 | } |
1513 | ||
1514 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1515 | struct net_device *dev) | |
1516 | { | |
1517 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
47f4d887 | 1518 | struct ieee80211_channel *chan = local->hw.conf.channel; |
e2ebc74d JB |
1519 | struct ieee80211_radiotap_header *prthdr = |
1520 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1521 | u16 len_rthdr; |
e2ebc74d | 1522 | |
47f4d887 LR |
1523 | /* |
1524 | * Frame injection is not allowed if beaconing is not allowed | |
1525 | * or if we need radar detection. Beaconing is usually not allowed when | |
1526 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1527 | * Passive scan is also used in world regulatory domains where | |
1528 | * your country is not known and as such it should be treated as | |
1529 | * NO TX unless the channel is explicitly allowed in which case | |
1530 | * your current regulatory domain would not have the passive scan | |
1531 | * flag. | |
1532 | * | |
1533 | * Since AP mode uses monitor interfaces to inject/TX management | |
1534 | * frames we can make AP mode the exception to this rule once it | |
1535 | * supports radar detection as its implementation can deal with | |
1536 | * radar detection by itself. We can do that later by adding a | |
1537 | * monitor flag interfaces used for AP support. | |
1538 | */ | |
1539 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | | |
1540 | IEEE80211_CHAN_PASSIVE_SCAN))) | |
1541 | goto fail; | |
1542 | ||
9b8a74e3 AG |
1543 | /* check for not even having the fixed radiotap header part */ |
1544 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1545 | goto fail; /* too short to be possibly valid */ | |
1546 | ||
1547 | /* is it a header version we can trust to find length from? */ | |
1548 | if (unlikely(prthdr->it_version)) | |
1549 | goto fail; /* only version 0 is supported */ | |
1550 | ||
1551 | /* then there must be a radiotap header with a length we can use */ | |
1552 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1553 | ||
1554 | /* does the skb contain enough to deliver on the alleged length? */ | |
1555 | if (unlikely(skb->len < len_rthdr)) | |
1556 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1557 | |
1558 | skb->dev = local->mdev; | |
1559 | ||
9b8a74e3 | 1560 | /* needed because we set skb device to master */ |
d0f09804 | 1561 | skb->iif = dev->ifindex; |
9b8a74e3 | 1562 | |
d0f09804 JB |
1563 | /* sometimes we do encrypt injected frames, will be fixed |
1564 | * up in radiotap parser if not wanted */ | |
1565 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1566 | |
e2ebc74d JB |
1567 | /* |
1568 | * fix up the pointers accounting for the radiotap | |
1569 | * header still being in there. We are being given | |
1570 | * a precooked IEEE80211 header so no need for | |
1571 | * normal processing | |
1572 | */ | |
9b8a74e3 | 1573 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1574 | /* |
9b8a74e3 AG |
1575 | * these are just fixed to the end of the rt area since we |
1576 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1577 | */ |
9b8a74e3 AG |
1578 | skb_set_network_header(skb, len_rthdr); |
1579 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1580 | |
9b8a74e3 AG |
1581 | /* pass the radiotap header up to the next stage intact */ |
1582 | dev_queue_xmit(skb); | |
e2ebc74d | 1583 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1584 | |
1585 | fail: | |
1586 | dev_kfree_skb(skb); | |
1587 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1588 | } |
1589 | ||
1590 | /** | |
1591 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1592 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1593 | * @skb: packet to be sent | |
1594 | * @dev: incoming interface | |
1595 | * | |
1596 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1597 | * not be freed, and caller is responsible for either retrying later or freeing | |
1598 | * skb). | |
1599 | * | |
1600 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1601 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1602 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1603 | * transmission (through low-level driver). | |
1604 | */ | |
1605 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1606 | struct net_device *dev) | |
1607 | { | |
133b8226 JB |
1608 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1609 | struct ieee80211_local *local = sdata->local; | |
e2ebc74d | 1610 | int ret = 1, head_need; |
065e9605 HH |
1611 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1612 | __le16 fc; | |
e2ebc74d | 1613 | struct ieee80211_hdr hdr; |
33b64eb2 | 1614 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1615 | const u8 *encaps_data; |
1616 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1617 | int nh_pos, h_pos; |
e2ebc74d | 1618 | struct sta_info *sta; |
ce3edf6d | 1619 | u32 sta_flags = 0; |
e2ebc74d | 1620 | |
e2ebc74d | 1621 | if (unlikely(skb->len < ETH_HLEN)) { |
e2ebc74d JB |
1622 | ret = 0; |
1623 | goto fail; | |
1624 | } | |
1625 | ||
1626 | nh_pos = skb_network_header(skb) - skb->data; | |
1627 | h_pos = skb_transport_header(skb) - skb->data; | |
1628 | ||
1629 | /* convert Ethernet header to proper 802.11 header (based on | |
1630 | * operation mode) */ | |
1631 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1632 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1633 | |
51fb61e7 | 1634 | switch (sdata->vif.type) { |
05c914fe JB |
1635 | case NL80211_IFTYPE_AP: |
1636 | case NL80211_IFTYPE_AP_VLAN: | |
065e9605 | 1637 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1638 | /* DA BSSID SA */ |
1639 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1640 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1641 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1642 | hdrlen = 24; | |
cf966838 | 1643 | break; |
05c914fe | 1644 | case NL80211_IFTYPE_WDS: |
065e9605 | 1645 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1646 | /* RA TA DA SA */ |
1647 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1648 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1649 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1650 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1651 | hdrlen = 30; | |
cf966838 | 1652 | break; |
33b64eb2 | 1653 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1654 | case NL80211_IFTYPE_MESH_POINT: |
065e9605 | 1655 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
472dbc45 | 1656 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1657 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1658 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
e32f85f7 LCC |
1659 | ret = 0; |
1660 | goto fail; | |
33b64eb2 | 1661 | } |
79617dee Y |
1662 | memset(&mesh_hdr, 0, sizeof(mesh_hdr)); |
1663 | ||
1664 | if (compare_ether_addr(dev->dev_addr, | |
1665 | skb->data + ETH_ALEN) == 0) { | |
1666 | /* RA TA DA SA */ | |
1667 | memset(hdr.addr1, 0, ETH_ALEN); | |
1668 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1669 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1670 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1671 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); | |
1672 | } else { | |
1673 | /* packet from other interface */ | |
1674 | struct mesh_path *mppath; | |
1675 | ||
1676 | memset(hdr.addr1, 0, ETH_ALEN); | |
1677 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1678 | memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN); | |
1679 | ||
1680 | if (is_multicast_ether_addr(skb->data)) | |
1681 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1682 | else { | |
1683 | rcu_read_lock(); | |
1684 | mppath = mpp_path_lookup(skb->data, sdata); | |
1685 | if (mppath) | |
1686 | memcpy(hdr.addr3, mppath->mpp, ETH_ALEN); | |
1687 | else | |
1688 | memset(hdr.addr3, 0xff, ETH_ALEN); | |
1689 | rcu_read_unlock(); | |
1690 | } | |
1691 | ||
1692 | mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6; | |
1693 | mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; | |
1694 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum); | |
1695 | memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN); | |
1696 | memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1697 | sdata->u.mesh.mesh_seqnum++; | |
1698 | meshhdrlen = 18; | |
1699 | } | |
33b64eb2 LCC |
1700 | hdrlen = 30; |
1701 | break; | |
1702 | #endif | |
05c914fe | 1703 | case NL80211_IFTYPE_STATION: |
065e9605 | 1704 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d | 1705 | /* BSSID SA DA */ |
46900298 | 1706 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
e2ebc74d JB |
1707 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1708 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1709 | hdrlen = 24; | |
cf966838 | 1710 | break; |
05c914fe | 1711 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1712 | /* DA SA BSSID */ |
1713 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1714 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
46900298 | 1715 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
e2ebc74d | 1716 | hdrlen = 24; |
cf966838 JB |
1717 | break; |
1718 | default: | |
e2ebc74d JB |
1719 | ret = 0; |
1720 | goto fail; | |
1721 | } | |
1722 | ||
7d185b8b JB |
1723 | /* |
1724 | * There's no need to try to look up the destination | |
1725 | * if it is a multicast address (which can only happen | |
1726 | * in AP mode) | |
1727 | */ | |
1728 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1729 | rcu_read_lock(); |
7d185b8b | 1730 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1731 | if (sta) |
07346f81 | 1732 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1733 | rcu_read_unlock(); |
e2ebc74d JB |
1734 | } |
1735 | ||
3434fbd3 | 1736 | /* receiver and we are QoS enabled, use a QoS type frame */ |
176be728 | 1737 | if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { |
065e9605 | 1738 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1739 | hdrlen += 2; |
1740 | } | |
1741 | ||
1742 | /* | |
238814fd JB |
1743 | * Drop unicast frames to unauthorised stations unless they are |
1744 | * EAPOL frames from the local station. | |
ce3edf6d | 1745 | */ |
e32f85f7 LCC |
1746 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1747 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1748 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1749 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1750 | compare_ether_addr(dev->dev_addr, |
1751 | skb->data + ETH_ALEN) == 0))) { | |
1752 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1753 | if (net_ratelimit()) |
0c68ae26 | 1754 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1755 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1756 | hdr.addr1); |
ce3edf6d JB |
1757 | #endif |
1758 | ||
1759 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1760 | ||
1761 | ret = 0; | |
1762 | goto fail; | |
1763 | } | |
1764 | ||
065e9605 | 1765 | hdr.frame_control = fc; |
e2ebc74d JB |
1766 | hdr.duration_id = 0; |
1767 | hdr.seq_ctrl = 0; | |
1768 | ||
1769 | skip_header_bytes = ETH_HLEN; | |
1770 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1771 | encaps_data = bridge_tunnel_header; | |
1772 | encaps_len = sizeof(bridge_tunnel_header); | |
1773 | skip_header_bytes -= 2; | |
1774 | } else if (ethertype >= 0x600) { | |
1775 | encaps_data = rfc1042_header; | |
1776 | encaps_len = sizeof(rfc1042_header); | |
1777 | skip_header_bytes -= 2; | |
1778 | } else { | |
1779 | encaps_data = NULL; | |
1780 | encaps_len = 0; | |
1781 | } | |
1782 | ||
1783 | skb_pull(skb, skip_header_bytes); | |
1784 | nh_pos -= skip_header_bytes; | |
1785 | h_pos -= skip_header_bytes; | |
1786 | ||
23c0752a | 1787 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1788 | |
23c0752a JB |
1789 | /* |
1790 | * So we need to modify the skb header and hence need a copy of | |
1791 | * that. The head_need variable above doesn't, so far, include | |
1792 | * the needed header space that we don't need right away. If we | |
1793 | * can, then we don't reallocate right now but only after the | |
1794 | * frame arrives at the master device (if it does...) | |
1795 | * | |
1796 | * If we cannot, however, then we will reallocate to include all | |
1797 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1798 | * make it big enough for everything we may ever need. | |
1799 | */ | |
e2ebc74d | 1800 | |
3a5be7d4 | 1801 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1802 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1803 | head_need += local->tx_headroom; | |
1804 | head_need = max_t(int, 0, head_need); | |
1805 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1806 | goto fail; |
e2ebc74d JB |
1807 | } |
1808 | ||
1809 | if (encaps_data) { | |
1810 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1811 | nh_pos += encaps_len; | |
1812 | h_pos += encaps_len; | |
1813 | } | |
c29b9b9b | 1814 | |
33b64eb2 LCC |
1815 | if (meshhdrlen > 0) { |
1816 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1817 | nh_pos += meshhdrlen; | |
1818 | h_pos += meshhdrlen; | |
1819 | } | |
1820 | ||
065e9605 | 1821 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1822 | __le16 *qos_control; |
1823 | ||
1824 | qos_control = (__le16*) skb_push(skb, 2); | |
1825 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1826 | /* | |
1827 | * Maybe we could actually set some fields here, for now just | |
1828 | * initialise to zero to indicate no special operation. | |
1829 | */ | |
1830 | *qos_control = 0; | |
1831 | } else | |
1832 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1833 | ||
e2ebc74d JB |
1834 | nh_pos += hdrlen; |
1835 | h_pos += hdrlen; | |
1836 | ||
d0f09804 | 1837 | skb->iif = dev->ifindex; |
b0a67179 | 1838 | |
e2ebc74d | 1839 | skb->dev = local->mdev; |
68aae116 SH |
1840 | dev->stats.tx_packets++; |
1841 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1842 | |
1843 | /* Update skb pointers to various headers since this modified frame | |
1844 | * is going to go through Linux networking code that may potentially | |
1845 | * need things like pointer to IP header. */ | |
1846 | skb_set_mac_header(skb, 0); | |
1847 | skb_set_network_header(skb, nh_pos); | |
1848 | skb_set_transport_header(skb, h_pos); | |
1849 | ||
1850 | dev->trans_start = jiffies; | |
1851 | dev_queue_xmit(skb); | |
1852 | ||
1853 | return 0; | |
1854 | ||
1855 | fail: | |
1856 | if (!ret) | |
1857 | dev_kfree_skb(skb); | |
1858 | ||
1859 | return ret; | |
1860 | } | |
1861 | ||
e2ebc74d | 1862 | |
e2530083 JB |
1863 | /* |
1864 | * ieee80211_clear_tx_pending may not be called in a context where | |
1865 | * it is possible that it packets could come in again. | |
1866 | */ | |
e2ebc74d JB |
1867 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1868 | { | |
2de8e0d9 | 1869 | int i; |
e2ebc74d | 1870 | |
2a577d98 JB |
1871 | for (i = 0; i < local->hw.queues; i++) |
1872 | skb_queue_purge(&local->pending[i]); | |
e2ebc74d JB |
1873 | } |
1874 | ||
cd8ffc80 JB |
1875 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
1876 | struct sk_buff *skb) | |
1877 | { | |
1878 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1879 | struct ieee80211_sub_if_data *sdata; | |
1880 | struct sta_info *sta; | |
1881 | struct ieee80211_hdr *hdr; | |
1882 | struct net_device *dev; | |
1883 | int ret; | |
1884 | bool result = true; | |
1885 | ||
1886 | /* does interface still exist? */ | |
1887 | dev = dev_get_by_index(&init_net, skb->iif); | |
1888 | if (!dev) { | |
1889 | dev_kfree_skb(skb); | |
1890 | return true; | |
1891 | } | |
1892 | ||
1893 | /* validate info->control.vif against skb->iif */ | |
1894 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1895 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
1896 | sdata = container_of(sdata->bss, | |
1897 | struct ieee80211_sub_if_data, | |
1898 | u.ap); | |
1899 | ||
1900 | if (unlikely(info->control.vif && info->control.vif != &sdata->vif)) { | |
1901 | dev_kfree_skb(skb); | |
1902 | result = true; | |
1903 | goto out; | |
1904 | } | |
1905 | ||
1906 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { | |
1907 | ieee80211_tx(dev, skb, true); | |
1908 | } else { | |
1909 | hdr = (struct ieee80211_hdr *)skb->data; | |
1910 | sta = sta_info_get(local, hdr->addr1); | |
1911 | ||
1912 | ret = __ieee80211_tx(local, &skb, sta); | |
1913 | if (ret != IEEE80211_TX_OK) | |
1914 | result = false; | |
1915 | } | |
1916 | ||
1917 | out: | |
1918 | dev_put(dev); | |
1919 | ||
1920 | return result; | |
1921 | } | |
1922 | ||
e2530083 JB |
1923 | /* |
1924 | * Transmit all pending packets. Called from tasklet, locks master device | |
1925 | * TX lock so that no new packets can come in. | |
1926 | */ | |
e2ebc74d JB |
1927 | void ieee80211_tx_pending(unsigned long data) |
1928 | { | |
1929 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1930 | struct net_device *dev = local->mdev; | |
2a577d98 | 1931 | unsigned long flags; |
cd8ffc80 | 1932 | int i; |
2a577d98 | 1933 | bool next; |
e2ebc74d | 1934 | |
f0e72851 | 1935 | rcu_read_lock(); |
e2ebc74d | 1936 | netif_tx_lock_bh(dev); |
e2530083 | 1937 | |
2a577d98 JB |
1938 | for (i = 0; i < local->hw.queues; i++) { |
1939 | /* | |
1940 | * If queue is stopped by something other than due to pending | |
1941 | * frames, or we have no pending frames, proceed to next queue. | |
1942 | */ | |
1943 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
1944 | next = false; | |
1945 | if (local->queue_stop_reasons[i] != | |
1946 | BIT(IEEE80211_QUEUE_STOP_REASON_PENDING) || | |
1947 | skb_queue_empty(&local->pending[i])) | |
1948 | next = true; | |
1949 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
1950 | ||
1951 | if (next) | |
e2ebc74d | 1952 | continue; |
e2530083 | 1953 | |
2a577d98 JB |
1954 | /* |
1955 | * start the queue now to allow processing our packets, | |
1956 | * we're under the tx lock here anyway so nothing will | |
1957 | * happen as a result of this | |
1958 | */ | |
f8e79ddd TW |
1959 | netif_start_subqueue(local->mdev, i); |
1960 | ||
2a577d98 | 1961 | while (!skb_queue_empty(&local->pending[i])) { |
1870cd71 | 1962 | struct sk_buff *skb = skb_dequeue(&local->pending[i]); |
2a577d98 | 1963 | |
cd8ffc80 | 1964 | if (!ieee80211_tx_pending_skb(local, skb)) { |
1870cd71 | 1965 | skb_queue_head(&local->pending[i], skb); |
2a577d98 JB |
1966 | break; |
1967 | } | |
e2ebc74d | 1968 | } |
2a577d98 JB |
1969 | |
1970 | /* Start regular packet processing again. */ | |
1971 | if (skb_queue_empty(&local->pending[i])) | |
1972 | ieee80211_wake_queue_by_reason(&local->hw, i, | |
1973 | IEEE80211_QUEUE_STOP_REASON_PENDING); | |
e2ebc74d | 1974 | } |
2a577d98 | 1975 | |
e2ebc74d | 1976 | netif_tx_unlock_bh(dev); |
f0e72851 | 1977 | rcu_read_unlock(); |
e2ebc74d JB |
1978 | } |
1979 | ||
1980 | /* functions for drivers to get certain frames */ | |
1981 | ||
8e7be8da | 1982 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
1983 | struct sk_buff *skb, |
1984 | struct beacon_data *beacon) | |
e2ebc74d JB |
1985 | { |
1986 | u8 *pos, *tim; | |
1987 | int aid0 = 0; | |
1988 | int i, have_bits = 0, n1, n2; | |
1989 | ||
1990 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1991 | * mode. */ | |
e2ebc74d JB |
1992 | if (atomic_read(&bss->num_sta_ps) > 0) |
1993 | /* in the hope that this is faster than | |
1994 | * checking byte-for-byte */ | |
1995 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1996 | IEEE80211_MAX_AID+1); | |
1997 | ||
1998 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1999 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
2000 | else |
2001 | bss->dtim_count--; | |
2002 | ||
2003 | tim = pos = (u8 *) skb_put(skb, 6); | |
2004 | *pos++ = WLAN_EID_TIM; | |
2005 | *pos++ = 4; | |
2006 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 2007 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
2008 | |
2009 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
2010 | aid0 = 1; | |
2011 | ||
2012 | if (have_bits) { | |
2013 | /* Find largest even number N1 so that bits numbered 1 through | |
2014 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
2015 | * (N2 + 1) x 8 through 2007 are 0. */ | |
2016 | n1 = 0; | |
2017 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
2018 | if (bss->tim[i]) { | |
2019 | n1 = i & 0xfe; | |
2020 | break; | |
2021 | } | |
2022 | } | |
2023 | n2 = n1; | |
2024 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
2025 | if (bss->tim[i]) { | |
2026 | n2 = i; | |
2027 | break; | |
2028 | } | |
2029 | } | |
2030 | ||
2031 | /* Bitmap control */ | |
2032 | *pos++ = n1 | aid0; | |
2033 | /* Part Virt Bitmap */ | |
2034 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
2035 | ||
2036 | tim[1] = n2 - n1 + 4; | |
2037 | skb_put(skb, n2 - n1); | |
2038 | } else { | |
2039 | *pos++ = aid0; /* Bitmap control */ | |
2040 | *pos++ = 0; /* Part Virt Bitmap */ | |
2041 | } | |
e2ebc74d JB |
2042 | } |
2043 | ||
32bfd35d | 2044 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 2045 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2046 | { |
2047 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 2048 | struct sk_buff *skb = NULL; |
e039fa4a | 2049 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
2050 | struct ieee80211_sub_if_data *sdata = NULL; |
2051 | struct ieee80211_if_ap *ap = NULL; | |
5dfdaf58 | 2052 | struct beacon_data *beacon; |
8318d78a | 2053 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 2054 | enum ieee80211_band band = local->hw.conf.channel->band; |
8318d78a | 2055 | |
2e92e6f2 | 2056 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
2057 | |
2058 | rcu_read_lock(); | |
e2ebc74d | 2059 | |
32bfd35d | 2060 | sdata = vif_to_sdata(vif); |
e2ebc74d | 2061 | |
05c914fe | 2062 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
2063 | ap = &sdata->u.ap; |
2064 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
2065 | if (ap && beacon) { |
2066 | /* | |
2067 | * headroom, head length, | |
2068 | * tail length and maximum TIM length | |
2069 | */ | |
2070 | skb = dev_alloc_skb(local->tx_headroom + | |
2071 | beacon->head_len + | |
2072 | beacon->tail_len + 256); | |
2073 | if (!skb) | |
2074 | goto out; | |
33b64eb2 | 2075 | |
902acc78 JB |
2076 | skb_reserve(skb, local->tx_headroom); |
2077 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
2078 | beacon->head_len); | |
33b64eb2 | 2079 | |
d0709a65 JB |
2080 | /* |
2081 | * Not very nice, but we want to allow the driver to call | |
2082 | * ieee80211_beacon_get() as a response to the set_tim() | |
2083 | * callback. That, however, is already invoked under the | |
2084 | * sta_lock to guarantee consistent and race-free update | |
2085 | * of the tim bitmap in mac80211 and the driver. | |
2086 | */ | |
2087 | if (local->tim_in_locked_section) { | |
8e7be8da | 2088 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2089 | } else { |
2090 | unsigned long flags; | |
2091 | ||
2092 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 2093 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2094 | spin_unlock_irqrestore(&local->sta_lock, flags); |
2095 | } | |
33b64eb2 | 2096 | |
902acc78 JB |
2097 | if (beacon->tail) |
2098 | memcpy(skb_put(skb, beacon->tail_len), | |
2099 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
2100 | } else |
2101 | goto out; | |
05c914fe | 2102 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
46900298 | 2103 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
9d139c81 | 2104 | struct ieee80211_hdr *hdr; |
af8cdcd8 | 2105 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
33b64eb2 | 2106 | |
af8cdcd8 | 2107 | if (!presp) |
9d139c81 JB |
2108 | goto out; |
2109 | ||
af8cdcd8 | 2110 | skb = skb_copy(presp, GFP_ATOMIC); |
9d139c81 JB |
2111 | if (!skb) |
2112 | goto out; | |
2113 | ||
2114 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
2115 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2116 | IEEE80211_STYPE_BEACON); | |
902acc78 | 2117 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
2118 | struct ieee80211_mgmt *mgmt; |
2119 | u8 *pos; | |
2120 | ||
902acc78 JB |
2121 | /* headroom, head length, tail length and maximum TIM length */ |
2122 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
2123 | if (!skb) | |
2124 | goto out; | |
2125 | ||
2126 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2127 | mgmt = (struct ieee80211_mgmt *) | |
2128 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
2129 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
2130 | mgmt->frame_control = |
2131 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
2132 | memset(mgmt->da, 0xff, ETH_ALEN); |
2133 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
2134 | /* BSSID is left zeroed, wildcard value */ | |
2135 | mgmt->u.beacon.beacon_int = | |
2136 | cpu_to_le16(local->hw.conf.beacon_int); | |
2137 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
2138 | ||
2139 | pos = skb_put(skb, 2); | |
2140 | *pos++ = WLAN_EID_SSID; | |
2141 | *pos++ = 0x0; | |
2142 | ||
f698d856 | 2143 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
2144 | } else { |
2145 | WARN_ON(1); | |
5dfdaf58 | 2146 | goto out; |
e2ebc74d JB |
2147 | } |
2148 | ||
e039fa4a JB |
2149 | info = IEEE80211_SKB_CB(skb); |
2150 | ||
d0f09804 JB |
2151 | skb->do_not_encrypt = 1; |
2152 | ||
e039fa4a | 2153 | info->band = band; |
e6a9854b JB |
2154 | /* |
2155 | * XXX: For now, always use the lowest rate | |
2156 | */ | |
2157 | info->control.rates[0].idx = 0; | |
2158 | info->control.rates[0].count = 1; | |
2159 | info->control.rates[1].idx = -1; | |
2160 | info->control.rates[2].idx = -1; | |
2161 | info->control.rates[3].idx = -1; | |
2162 | info->control.rates[4].idx = -1; | |
2163 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
e039fa4a JB |
2164 | |
2165 | info->control.vif = vif; | |
f591fa5d JB |
2166 | |
2167 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
2168 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
2169 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e6a9854b | 2170 | out: |
5dfdaf58 | 2171 | rcu_read_unlock(); |
e2ebc74d JB |
2172 | return skb; |
2173 | } | |
2174 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
2175 | ||
32bfd35d | 2176 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2177 | const void *frame, size_t frame_len, |
e039fa4a | 2178 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2179 | struct ieee80211_rts *rts) |
2180 | { | |
2181 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2182 | |
065e9605 HH |
2183 | rts->frame_control = |
2184 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
2185 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2186 | frame_txctl); | |
e2ebc74d JB |
2187 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2188 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2189 | } | |
2190 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2191 | ||
32bfd35d | 2192 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2193 | const void *frame, size_t frame_len, |
e039fa4a | 2194 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2195 | struct ieee80211_cts *cts) |
2196 | { | |
2197 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2198 | |
065e9605 HH |
2199 | cts->frame_control = |
2200 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2201 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2202 | frame_len, frame_txctl); | |
e2ebc74d JB |
2203 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2204 | } | |
2205 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2206 | ||
2207 | struct sk_buff * | |
32bfd35d | 2208 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2209 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2210 | { |
2211 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2212 | struct sk_buff *skb = NULL; |
e2ebc74d | 2213 | struct sta_info *sta; |
5cf121c3 | 2214 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2215 | struct ieee80211_sub_if_data *sdata; |
2216 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2217 | struct beacon_data *beacon; |
e039fa4a | 2218 | struct ieee80211_tx_info *info; |
e2ebc74d | 2219 | |
32bfd35d | 2220 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2221 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2222 | |
2223 | if (!bss) | |
e2ebc74d JB |
2224 | return NULL; |
2225 | ||
5dfdaf58 JB |
2226 | rcu_read_lock(); |
2227 | beacon = rcu_dereference(bss->beacon); | |
2228 | ||
05c914fe | 2229 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2230 | goto out; |
5dfdaf58 | 2231 | |
e2ebc74d | 2232 | if (bss->dtim_count != 0) |
747cf5e9 | 2233 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2234 | |
e2ebc74d JB |
2235 | while (1) { |
2236 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2237 | if (!skb) | |
747cf5e9 | 2238 | goto out; |
e2ebc74d JB |
2239 | local->total_ps_buffered--; |
2240 | ||
2241 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2242 | struct ieee80211_hdr *hdr = | |
2243 | (struct ieee80211_hdr *) skb->data; | |
2244 | /* more buffered multicast/broadcast frames ==> set | |
2245 | * MoreData flag in IEEE 802.11 header to inform PS | |
2246 | * STAs */ | |
2247 | hdr->frame_control |= | |
2248 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2249 | } | |
2250 | ||
133b8226 | 2251 | if (!ieee80211_tx_prepare(local, &tx, skb)) |
e2ebc74d JB |
2252 | break; |
2253 | dev_kfree_skb_any(skb); | |
2254 | } | |
e039fa4a JB |
2255 | |
2256 | info = IEEE80211_SKB_CB(skb); | |
2257 | ||
e2ebc74d | 2258 | sta = tx.sta; |
5cf121c3 JB |
2259 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2260 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2261 | info->band = tx.channel->band; |
e2ebc74d | 2262 | |
97b045d6 | 2263 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2264 | skb = NULL; |
97b045d6 | 2265 | out: |
d0709a65 | 2266 | rcu_read_unlock(); |
e2ebc74d JB |
2267 | |
2268 | return skb; | |
2269 | } | |
2270 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |