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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" | |
24487981 | 28 | #include "driver-ops.h" |
2c8dccc7 | 29 | #include "led.h" |
33b64eb2 | 30 | #include "mesh.h" |
e2ebc74d JB |
31 | #include "wep.h" |
32 | #include "wpa.h" | |
33 | #include "wme.h" | |
2c8dccc7 | 34 | #include "rate.h" |
e2ebc74d JB |
35 | |
36 | #define IEEE80211_TX_OK 0 | |
37 | #define IEEE80211_TX_AGAIN 1 | |
2de8e0d9 | 38 | #define IEEE80211_TX_PENDING 2 |
e2ebc74d JB |
39 | |
40 | /* misc utils */ | |
41 | ||
03f93c3d JB |
42 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
43 | int next_frag_len) | |
e2ebc74d JB |
44 | { |
45 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 46 | struct ieee80211_rate *txrate; |
e2ebc74d | 47 | struct ieee80211_local *local = tx->local; |
8318d78a | 48 | struct ieee80211_supported_band *sband; |
358c8d9d | 49 | struct ieee80211_hdr *hdr; |
e6a9854b JB |
50 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
51 | ||
52 | /* assume HW handles this */ | |
53 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) | |
54 | return 0; | |
55 | ||
56 | /* uh huh? */ | |
57 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) | |
58 | return 0; | |
e2ebc74d | 59 | |
2e92e6f2 | 60 | sband = local->hw.wiphy->bands[tx->channel->band]; |
e6a9854b | 61 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
8318d78a | 62 | |
e6a9854b | 63 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
e2ebc74d JB |
64 | |
65 | /* | |
66 | * data and mgmt (except PS Poll): | |
67 | * - during CFP: 32768 | |
68 | * - during contention period: | |
69 | * if addr1 is group address: 0 | |
70 | * if more fragments = 0 and addr1 is individual address: time to | |
71 | * transmit one ACK plus SIFS | |
72 | * if more fragments = 1 and addr1 is individual address: time to | |
73 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
74 | * | |
75 | * IEEE 802.11, 9.6: | |
76 | * - control response frame (CTS or ACK) shall be transmitted using the | |
77 | * same rate as the immediately previous frame in the frame exchange | |
78 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
79 | * at the highest possible rate belonging to the PHY rates in the | |
80 | * BSSBasicRateSet | |
81 | */ | |
358c8d9d HH |
82 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
83 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d | 84 | /* TODO: These control frames are not currently sent by |
ccd7b362 | 85 | * mac80211, but should they be implemented, this function |
e2ebc74d JB |
86 | * needs to be updated to support duration field calculation. |
87 | * | |
88 | * RTS: time needed to transmit pending data/mgmt frame plus | |
89 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
90 | * CTS: duration of immediately previous RTS minus time | |
91 | * required to transmit CTS and its SIFS | |
92 | * ACK: 0 if immediately previous directed data/mgmt had | |
93 | * more=0, with more=1 duration in ACK frame is duration | |
94 | * from previous frame minus time needed to transmit ACK | |
95 | * and its SIFS | |
96 | * PS Poll: BIT(15) | BIT(14) | aid | |
97 | */ | |
98 | return 0; | |
99 | } | |
100 | ||
101 | /* data/mgmt */ | |
102 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 103 | return cpu_to_le16(32768); |
e2ebc74d JB |
104 | |
105 | if (group_addr) /* Group address as the destination - no ACK */ | |
106 | return 0; | |
107 | ||
108 | /* Individual destination address: | |
109 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
110 | * CTS and ACK frames shall be transmitted using the highest rate in | |
111 | * basic rate set that is less than or equal to the rate of the | |
112 | * immediately previous frame and that is using the same modulation | |
113 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
114 | * the highest mandatory rate of the PHY that is less than or equal to | |
115 | * the rate of the previous frame is used. | |
116 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
117 | */ | |
118 | rate = -1; | |
8318d78a JB |
119 | /* use lowest available if everything fails */ |
120 | mrate = sband->bitrates[0].bitrate; | |
121 | for (i = 0; i < sband->n_bitrates; i++) { | |
122 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 123 | |
8318d78a JB |
124 | if (r->bitrate > txrate->bitrate) |
125 | break; | |
e2ebc74d | 126 | |
bda3933a | 127 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
8318d78a JB |
128 | rate = r->bitrate; |
129 | ||
130 | switch (sband->band) { | |
131 | case IEEE80211_BAND_2GHZ: { | |
132 | u32 flag; | |
133 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
134 | flag = IEEE80211_RATE_MANDATORY_G; | |
135 | else | |
136 | flag = IEEE80211_RATE_MANDATORY_B; | |
137 | if (r->flags & flag) | |
138 | mrate = r->bitrate; | |
139 | break; | |
140 | } | |
141 | case IEEE80211_BAND_5GHZ: | |
142 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
143 | mrate = r->bitrate; | |
144 | break; | |
145 | case IEEE80211_NUM_BANDS: | |
146 | WARN_ON(1); | |
147 | break; | |
148 | } | |
e2ebc74d JB |
149 | } |
150 | if (rate == -1) { | |
151 | /* No matching basic rate found; use highest suitable mandatory | |
152 | * PHY rate */ | |
153 | rate = mrate; | |
154 | } | |
155 | ||
156 | /* Time needed to transmit ACK | |
157 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
158 | * to closest integer */ | |
159 | ||
160 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
bda3933a | 161 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
162 | |
163 | if (next_frag_len) { | |
164 | /* Frame is fragmented: duration increases with time needed to | |
165 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
166 | dur *= 2; /* ACK + SIFS */ | |
167 | /* next fragment */ | |
168 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 169 | txrate->bitrate, erp, |
bda3933a | 170 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
171 | } |
172 | ||
03f93c3d | 173 | return cpu_to_le16(dur); |
e2ebc74d JB |
174 | } |
175 | ||
133b8226 JB |
176 | static int inline is_ieee80211_device(struct ieee80211_local *local, |
177 | struct net_device *dev) | |
e2ebc74d | 178 | { |
133b8226 | 179 | return local == wdev_priv(dev->ieee80211_ptr); |
e2ebc74d JB |
180 | } |
181 | ||
182 | /* tx handlers */ | |
183 | ||
d9e8a70f | 184 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 185 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 186 | { |
358c8d9d | 187 | |
e039fa4a | 188 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 189 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
190 | u32 sta_flags; |
191 | ||
e039fa4a | 192 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 193 | return TX_CONTINUE; |
58d4185e | 194 | |
c2b13452 | 195 | if (unlikely(tx->local->sw_scanning) && |
a9a6ffff KV |
196 | !ieee80211_is_probe_req(hdr->frame_control) && |
197 | !ieee80211_is_nullfunc(hdr->frame_control)) | |
198 | /* | |
199 | * When software scanning only nullfunc frames (to notify | |
200 | * the sleep state to the AP) and probe requests (for the | |
201 | * active scan) are allowed, all other frames should not be | |
202 | * sent and we should not get here, but if we do | |
203 | * nonetheless, drop them to avoid sending them | |
204 | * off-channel. See the link below and | |
205 | * ieee80211_start_scan() for more. | |
206 | * | |
207 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 | |
208 | */ | |
9ae54c84 | 209 | return TX_DROP; |
e2ebc74d | 210 | |
05c914fe | 211 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
212 | return TX_CONTINUE; |
213 | ||
5cf121c3 | 214 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 215 | return TX_CONTINUE; |
e2ebc74d | 216 | |
07346f81 | 217 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 218 | |
5cf121c3 | 219 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 220 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 221 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 222 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
223 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
224 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 JB |
225 | "associated station %pM\n", |
226 | tx->dev->name, hdr->addr1); | |
e2ebc74d JB |
227 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
228 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 229 | return TX_DROP; |
e2ebc74d JB |
230 | } |
231 | } else { | |
358c8d9d | 232 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 233 | tx->local->num_sta == 0 && |
05c914fe | 234 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
235 | /* |
236 | * No associated STAs - no need to send multicast | |
237 | * frames. | |
238 | */ | |
9ae54c84 | 239 | return TX_DROP; |
e2ebc74d | 240 | } |
9ae54c84 | 241 | return TX_CONTINUE; |
e2ebc74d JB |
242 | } |
243 | ||
9ae54c84 | 244 | return TX_CONTINUE; |
e2ebc74d JB |
245 | } |
246 | ||
e2ebc74d JB |
247 | /* This function is called whenever the AP is about to exceed the maximum limit |
248 | * of buffered frames for power saving STAs. This situation should not really | |
249 | * happen often during normal operation, so dropping the oldest buffered packet | |
250 | * from each queue should be OK to make some room for new frames. */ | |
251 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
252 | { | |
253 | int total = 0, purged = 0; | |
254 | struct sk_buff *skb; | |
255 | struct ieee80211_sub_if_data *sdata; | |
256 | struct sta_info *sta; | |
257 | ||
79010420 JB |
258 | /* |
259 | * virtual interfaces are protected by RCU | |
260 | */ | |
261 | rcu_read_lock(); | |
262 | ||
263 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 264 | struct ieee80211_if_ap *ap; |
05c914fe | 265 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
266 | continue; |
267 | ap = &sdata->u.ap; | |
268 | skb = skb_dequeue(&ap->ps_bc_buf); | |
269 | if (skb) { | |
270 | purged++; | |
271 | dev_kfree_skb(skb); | |
272 | } | |
273 | total += skb_queue_len(&ap->ps_bc_buf); | |
274 | } | |
e2ebc74d | 275 | |
d0709a65 | 276 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
277 | skb = skb_dequeue(&sta->ps_tx_buf); |
278 | if (skb) { | |
279 | purged++; | |
280 | dev_kfree_skb(skb); | |
281 | } | |
282 | total += skb_queue_len(&sta->ps_tx_buf); | |
283 | } | |
d0709a65 JB |
284 | |
285 | rcu_read_unlock(); | |
e2ebc74d JB |
286 | |
287 | local->total_ps_buffered = total; | |
54223995 | 288 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 289 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 290 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 291 | #endif |
e2ebc74d JB |
292 | } |
293 | ||
9ae54c84 | 294 | static ieee80211_tx_result |
5cf121c3 | 295 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 296 | { |
e039fa4a | 297 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 298 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 299 | |
7d54d0dd JB |
300 | /* |
301 | * broadcast/multicast frame | |
302 | * | |
303 | * If any of the associated stations is in power save mode, | |
304 | * the frame is buffered to be sent after DTIM beacon frame. | |
305 | * This is done either by the hardware or us. | |
306 | */ | |
307 | ||
3e122be0 JB |
308 | /* powersaving STAs only in AP/VLAN mode */ |
309 | if (!tx->sdata->bss) | |
310 | return TX_CONTINUE; | |
311 | ||
312 | /* no buffering for ordered frames */ | |
358c8d9d | 313 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 314 | return TX_CONTINUE; |
7d54d0dd JB |
315 | |
316 | /* no stations in PS mode */ | |
317 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 318 | return TX_CONTINUE; |
7d54d0dd JB |
319 | |
320 | /* buffered in mac80211 */ | |
321 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
322 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
323 | purge_old_ps_buffers(tx->local); | |
324 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
325 | AP_MAX_BC_BUFFER) { | |
54223995 | 326 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d JB |
327 | if (net_ratelimit()) { |
328 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
329 | "dropping the oldest frame\n", | |
330 | tx->dev->name); | |
331 | } | |
f4ea83dd | 332 | #endif |
e2ebc74d JB |
333 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
334 | } else | |
335 | tx->local->total_ps_buffered++; | |
336 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 337 | return TX_QUEUED; |
e2ebc74d JB |
338 | } |
339 | ||
7d54d0dd | 340 | /* buffered in hardware */ |
e039fa4a | 341 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 342 | |
9ae54c84 | 343 | return TX_CONTINUE; |
e2ebc74d JB |
344 | } |
345 | ||
fb733336 JM |
346 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
347 | struct sk_buff *skb) | |
348 | { | |
349 | if (!ieee80211_is_mgmt(fc)) | |
350 | return 0; | |
351 | ||
352 | if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) | |
353 | return 0; | |
354 | ||
355 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) | |
356 | skb->data)) | |
357 | return 0; | |
358 | ||
359 | return 1; | |
360 | } | |
361 | ||
9ae54c84 | 362 | static ieee80211_tx_result |
5cf121c3 | 363 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
364 | { |
365 | struct sta_info *sta = tx->sta; | |
e039fa4a | 366 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 367 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
07346f81 | 368 | u32 staflags; |
e2ebc74d | 369 | |
358c8d9d | 370 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control))) |
9ae54c84 | 371 | return TX_CONTINUE; |
e2ebc74d | 372 | |
07346f81 JB |
373 | staflags = get_sta_flags(sta); |
374 | ||
375 | if (unlikely((staflags & WLAN_STA_PS) && | |
376 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 377 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 378 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
e2ebc74d | 379 | "before %d)\n", |
0c68ae26 | 380 | sta->sta.addr, sta->sta.aid, |
e2ebc74d JB |
381 | skb_queue_len(&sta->ps_tx_buf)); |
382 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
383 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
384 | purge_old_ps_buffers(tx->local); | |
385 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
386 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 387 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 388 | if (net_ratelimit()) { |
0c68ae26 | 389 | printk(KERN_DEBUG "%s: STA %pM TX " |
e2ebc74d | 390 | "buffer full - dropping oldest frame\n", |
0c68ae26 | 391 | tx->dev->name, sta->sta.addr); |
e2ebc74d | 392 | } |
f4ea83dd | 393 | #endif |
e2ebc74d JB |
394 | dev_kfree_skb(old); |
395 | } else | |
396 | tx->local->total_ps_buffered++; | |
004c872e | 397 | |
e2ebc74d | 398 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
399 | if (skb_queue_empty(&sta->ps_tx_buf)) |
400 | sta_info_set_tim_bit(sta); | |
401 | ||
e039fa4a | 402 | info->control.jiffies = jiffies; |
8f77f384 | 403 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
e2ebc74d | 404 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 405 | return TX_QUEUED; |
e2ebc74d JB |
406 | } |
407 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 408 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0c68ae26 | 409 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
e2ebc74d | 410 | "set -> send frame\n", tx->dev->name, |
0c68ae26 | 411 | sta->sta.addr); |
e2ebc74d JB |
412 | } |
413 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
fef99929 CL |
414 | if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) { |
415 | /* | |
416 | * The sleeping station with pending data is now snoozing. | |
417 | * It queried us for its buffered frames and will go back | |
418 | * to deep sleep once it got everything. | |
419 | * | |
420 | * inform the driver, in case the hardware does powersave | |
421 | * frame filtering and keeps a station blacklist on its own | |
422 | * (e.g: p54), so that frames can be delivered unimpeded. | |
423 | * | |
8f77f384 | 424 | * Note: It should be safe to disable the filter now. |
fef99929 CL |
425 | * As, it is really unlikely that we still have any pending |
426 | * frame for this station in the hw's buffers/fifos left, | |
427 | * that is not rejected with a unsuccessful tx_status yet. | |
428 | */ | |
e2ebc74d | 429 | |
fef99929 CL |
430 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
431 | } | |
9ae54c84 | 432 | return TX_CONTINUE; |
e2ebc74d JB |
433 | } |
434 | ||
d9e8a70f | 435 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 436 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 437 | { |
5cf121c3 | 438 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 439 | return TX_CONTINUE; |
e2ebc74d | 440 | |
5cf121c3 | 441 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
442 | return ieee80211_tx_h_unicast_ps_buf(tx); |
443 | else | |
444 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
445 | } | |
446 | ||
d9e8a70f | 447 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 448 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 449 | { |
d3feaf5a | 450 | struct ieee80211_key *key = NULL; |
e039fa4a | 451 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 452 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 453 | |
d0f09804 | 454 | if (unlikely(tx->skb->do_not_encrypt)) |
e2ebc74d | 455 | tx->key = NULL; |
d4e46a3d JB |
456 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
457 | tx->key = key; | |
3cfcf6ac JM |
458 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
459 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) | |
460 | tx->key = key; | |
d4e46a3d JB |
461 | else if ((key = rcu_dereference(tx->sdata->default_key))) |
462 | tx->key = key; | |
e2ebc74d | 463 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 464 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e0463f50 JM |
465 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
466 | (!ieee80211_is_robust_mgmt_frame(hdr) || | |
467 | (ieee80211_is_action(hdr->frame_control) && | |
468 | tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { | |
e2ebc74d | 469 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 470 | return TX_DROP; |
176e4f84 | 471 | } else |
e2ebc74d JB |
472 | tx->key = NULL; |
473 | ||
474 | if (tx->key) { | |
475 | tx->key->tx_rx_count++; | |
011bfcc4 | 476 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
477 | |
478 | switch (tx->key->conf.alg) { | |
479 | case ALG_WEP: | |
358c8d9d | 480 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
481 | break; |
482 | case ALG_TKIP: | |
358c8d9d | 483 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
484 | tx->key = NULL; |
485 | break; | |
fb733336 JM |
486 | case ALG_CCMP: |
487 | if (!ieee80211_is_data_present(hdr->frame_control) && | |
488 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
489 | tx->skb)) | |
490 | tx->key = NULL; | |
491 | break; | |
3cfcf6ac JM |
492 | case ALG_AES_CMAC: |
493 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
494 | tx->key = NULL; | |
495 | break; | |
176e4f84 | 496 | } |
e2ebc74d JB |
497 | } |
498 | ||
176e4f84 | 499 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
d0f09804 | 500 | tx->skb->do_not_encrypt = 1; |
176e4f84 | 501 | |
9ae54c84 | 502 | return TX_CONTINUE; |
e2ebc74d JB |
503 | } |
504 | ||
d9e8a70f | 505 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 506 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 507 | { |
e039fa4a | 508 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
509 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
510 | struct ieee80211_supported_band *sband; | |
511 | struct ieee80211_rate *rate; | |
512 | int i, len; | |
513 | bool inval = false, rts = false, short_preamble = false; | |
514 | struct ieee80211_tx_rate_control txrc; | |
8318d78a | 515 | |
e6a9854b | 516 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 517 | |
e6a9854b | 518 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 519 | |
e6a9854b | 520 | len = min_t(int, tx->skb->len + FCS_LEN, |
b9a5f8ca | 521 | tx->local->hw.wiphy->frag_threshold); |
e6a9854b JB |
522 | |
523 | /* set up the tx rate control struct we give the RC algo */ | |
524 | txrc.hw = local_to_hw(tx->local); | |
525 | txrc.sband = sband; | |
526 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
527 | txrc.skb = tx->skb; | |
528 | txrc.reported_rate.idx = -1; | |
529 | txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx; | |
530 | ||
531 | /* set up RTS protection if desired */ | |
b9a5f8ca | 532 | if (len > tx->local->hw.wiphy->rts_threshold) { |
e6a9854b | 533 | txrc.rts = rts = true; |
e2ebc74d | 534 | } |
e2ebc74d | 535 | |
e6a9854b JB |
536 | /* |
537 | * Use short preamble if the BSS can handle it, but not for | |
538 | * management frames unless we know the receiver can handle | |
539 | * that -- the management frame might be to a station that | |
540 | * just wants a probe response. | |
541 | */ | |
542 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
543 | (ieee80211_is_data(hdr->frame_control) || | |
544 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
545 | txrc.short_preamble = short_preamble = true; | |
e2ebc74d | 546 | |
2e92e6f2 | 547 | |
e6a9854b JB |
548 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
549 | ||
550 | if (unlikely(info->control.rates[0].idx < 0)) | |
551 | return TX_DROP; | |
552 | ||
553 | if (txrc.reported_rate.idx < 0) | |
554 | txrc.reported_rate = info->control.rates[0]; | |
e2ebc74d | 555 | |
e039fa4a | 556 | if (tx->sta) |
e6a9854b | 557 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 558 | |
e6a9854b JB |
559 | if (unlikely(!info->control.rates[0].count)) |
560 | info->control.rates[0].count = 1; | |
e2ebc74d | 561 | |
9955151d GS |
562 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && |
563 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) | |
564 | info->control.rates[0].count = 1; | |
565 | ||
e6a9854b JB |
566 | if (is_multicast_ether_addr(hdr->addr1)) { |
567 | /* | |
568 | * XXX: verify the rate is in the basic rateset | |
569 | */ | |
570 | return TX_CONTINUE; | |
e2ebc74d JB |
571 | } |
572 | ||
e6a9854b JB |
573 | /* |
574 | * set up the RTS/CTS rate as the fastest basic rate | |
575 | * that is not faster than the data rate | |
576 | * | |
577 | * XXX: Should this check all retry rates? | |
578 | */ | |
579 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
580 | s8 baserate = 0; | |
581 | ||
582 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
583 | ||
584 | for (i = 0; i < sband->n_bitrates; i++) { | |
585 | /* must be a basic rate */ | |
586 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
587 | continue; | |
588 | /* must not be faster than the data rate */ | |
589 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
590 | continue; | |
591 | /* maximum */ | |
592 | if (sband->bitrates[baserate].bitrate < | |
593 | sband->bitrates[i].bitrate) | |
594 | baserate = i; | |
595 | } | |
596 | ||
597 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
598 | } |
599 | ||
e6a9854b JB |
600 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
601 | /* | |
602 | * make sure there's no valid rate following | |
603 | * an invalid one, just in case drivers don't | |
604 | * take the API seriously to stop at -1. | |
605 | */ | |
606 | if (inval) { | |
607 | info->control.rates[i].idx = -1; | |
608 | continue; | |
609 | } | |
610 | if (info->control.rates[i].idx < 0) { | |
611 | inval = true; | |
612 | continue; | |
613 | } | |
8318d78a | 614 | |
e6a9854b JB |
615 | /* |
616 | * For now assume MCS is already set up correctly, this | |
617 | * needs to be fixed. | |
618 | */ | |
619 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
620 | WARN_ON(info->control.rates[i].idx > 76); | |
621 | continue; | |
622 | } | |
e2ebc74d | 623 | |
e6a9854b JB |
624 | /* set up RTS protection if desired */ |
625 | if (rts) | |
626 | info->control.rates[i].flags |= | |
627 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 628 | |
e6a9854b | 629 | /* RC is busted */ |
075cbc9e S |
630 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
631 | sband->n_bitrates)) { | |
e6a9854b JB |
632 | info->control.rates[i].idx = -1; |
633 | continue; | |
8318d78a | 634 | } |
e2ebc74d | 635 | |
e6a9854b JB |
636 | rate = &sband->bitrates[info->control.rates[i].idx]; |
637 | ||
638 | /* set up short preamble */ | |
639 | if (short_preamble && | |
640 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
641 | info->control.rates[i].flags |= | |
642 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
643 | ||
644 | /* set up G protection */ | |
645 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
646 | rate->flags & IEEE80211_RATE_ERP_G) | |
647 | info->control.rates[i].flags |= | |
648 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
649 | } |
650 | ||
e6a9854b JB |
651 | return TX_CONTINUE; |
652 | } | |
653 | ||
654 | static ieee80211_tx_result debug_noinline | |
655 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) | |
656 | { | |
657 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
658 | ||
e2454948 | 659 | if (tx->sta) |
17741cdc | 660 | info->control.sta = &tx->sta->sta; |
e2454948 JB |
661 | |
662 | return TX_CONTINUE; | |
663 | } | |
664 | ||
f591fa5d JB |
665 | static ieee80211_tx_result debug_noinline |
666 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
667 | { | |
668 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
669 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
670 | u16 *seq; | |
671 | u8 *qc; | |
672 | int tid; | |
673 | ||
25d834e1 JB |
674 | /* |
675 | * Packet injection may want to control the sequence | |
676 | * number, if we have no matching interface then we | |
677 | * neither assign one ourselves nor ask the driver to. | |
678 | */ | |
679 | if (unlikely(!info->control.vif)) | |
680 | return TX_CONTINUE; | |
681 | ||
f591fa5d JB |
682 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
683 | return TX_CONTINUE; | |
684 | ||
685 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
686 | return TX_CONTINUE; | |
687 | ||
94778280 JB |
688 | /* |
689 | * Anything but QoS data that has a sequence number field | |
690 | * (is long enough) gets a sequence number from the global | |
691 | * counter. | |
692 | */ | |
f591fa5d | 693 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 694 | /* driver should assign sequence number */ |
f591fa5d | 695 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
696 | /* for pure STA mode without beacons, we can do it */ |
697 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
698 | tx->sdata->sequence_number += 0x10; | |
699 | tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ; | |
f591fa5d JB |
700 | return TX_CONTINUE; |
701 | } | |
702 | ||
703 | /* | |
704 | * This should be true for injected/management frames only, for | |
705 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
706 | * above since they are not QoS-data frames. | |
707 | */ | |
708 | if (!tx->sta) | |
709 | return TX_CONTINUE; | |
710 | ||
711 | /* include per-STA, per-TID sequence counter */ | |
712 | ||
713 | qc = ieee80211_get_qos_ctl(hdr); | |
714 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
715 | seq = &tx->sta->tid_seq[tid]; | |
716 | ||
717 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
718 | ||
719 | /* Increase the sequence number. */ | |
720 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
721 | ||
722 | return TX_CONTINUE; | |
723 | } | |
724 | ||
2de8e0d9 JB |
725 | static int ieee80211_fragment(struct ieee80211_local *local, |
726 | struct sk_buff *skb, int hdrlen, | |
727 | int frag_threshold) | |
728 | { | |
729 | struct sk_buff *tail = skb, *tmp; | |
730 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
731 | int pos = hdrlen + per_fragm; | |
732 | int rem = skb->len - hdrlen - per_fragm; | |
733 | ||
734 | if (WARN_ON(rem < 0)) | |
735 | return -EINVAL; | |
736 | ||
737 | while (rem) { | |
738 | int fraglen = per_fragm; | |
739 | ||
740 | if (fraglen > rem) | |
741 | fraglen = rem; | |
742 | rem -= fraglen; | |
743 | tmp = dev_alloc_skb(local->tx_headroom + | |
744 | frag_threshold + | |
745 | IEEE80211_ENCRYPT_HEADROOM + | |
746 | IEEE80211_ENCRYPT_TAILROOM); | |
747 | if (!tmp) | |
748 | return -ENOMEM; | |
749 | tail->next = tmp; | |
750 | tail = tmp; | |
751 | skb_reserve(tmp, local->tx_headroom + | |
752 | IEEE80211_ENCRYPT_HEADROOM); | |
753 | /* copy control information */ | |
754 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); | |
755 | skb_copy_queue_mapping(tmp, skb); | |
756 | tmp->priority = skb->priority; | |
757 | tmp->do_not_encrypt = skb->do_not_encrypt; | |
758 | tmp->dev = skb->dev; | |
759 | tmp->iif = skb->iif; | |
760 | ||
761 | /* copy header and data */ | |
762 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); | |
763 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); | |
764 | ||
765 | pos += fraglen; | |
766 | } | |
767 | ||
768 | skb->len = hdrlen + per_fragm; | |
769 | return 0; | |
770 | } | |
771 | ||
d9e8a70f | 772 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
773 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
774 | { | |
2de8e0d9 JB |
775 | struct sk_buff *skb = tx->skb; |
776 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
777 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
b9a5f8ca | 778 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; |
2de8e0d9 JB |
779 | int hdrlen; |
780 | int fragnum; | |
e2454948 JB |
781 | |
782 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
783 | return TX_CONTINUE; | |
784 | ||
eefce91a JB |
785 | /* |
786 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
787 | * This scenario is handled in __ieee80211_tx_prepare but extra |
788 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a | 789 | */ |
8b30b1fe | 790 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
791 | return TX_DROP; |
792 | ||
065e9605 | 793 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 | 794 | |
2de8e0d9 | 795 | /* internal error, why is TX_FRAGMENTED set? */ |
8ccd8f21 | 796 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) |
2de8e0d9 | 797 | return TX_DROP; |
e6a9854b | 798 | |
2de8e0d9 JB |
799 | /* |
800 | * Now fragment the frame. This will allocate all the fragments and | |
801 | * chain them (using skb as the first fragment) to skb->next. | |
802 | * During transmission, we will remove the successfully transmitted | |
803 | * fragments from this list. When the low-level driver rejects one | |
804 | * of the fragments then we will simply pretend to accept the skb | |
805 | * but store it away as pending. | |
806 | */ | |
807 | if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) | |
808 | return TX_DROP; | |
e6a9854b | 809 | |
2de8e0d9 JB |
810 | /* update duration/seq/flags of fragments */ |
811 | fragnum = 0; | |
812 | do { | |
813 | int next_len; | |
814 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
e6a9854b | 815 | |
2de8e0d9 JB |
816 | hdr = (void *)skb->data; |
817 | info = IEEE80211_SKB_CB(skb); | |
e6a9854b | 818 | |
2de8e0d9 JB |
819 | if (skb->next) { |
820 | hdr->frame_control |= morefrags; | |
821 | next_len = skb->next->len; | |
e6a9854b JB |
822 | /* |
823 | * No multi-rate retries for fragmented frames, that | |
824 | * would completely throw off the NAV at other STAs. | |
825 | */ | |
826 | info->control.rates[1].idx = -1; | |
827 | info->control.rates[2].idx = -1; | |
828 | info->control.rates[3].idx = -1; | |
829 | info->control.rates[4].idx = -1; | |
830 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
831 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
2de8e0d9 JB |
832 | } else { |
833 | hdr->frame_control &= ~morefrags; | |
834 | next_len = 0; | |
e6a9854b | 835 | } |
2de8e0d9 JB |
836 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); |
837 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); | |
838 | fragnum++; | |
839 | } while ((skb = skb->next)); | |
e2ebc74d | 840 | |
9ae54c84 | 841 | return TX_CONTINUE; |
e2ebc74d JB |
842 | } |
843 | ||
d9e8a70f | 844 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
845 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
846 | { | |
847 | if (!tx->key) | |
848 | return TX_CONTINUE; | |
849 | ||
850 | switch (tx->key->conf.alg) { | |
851 | case ALG_WEP: | |
852 | return ieee80211_crypto_wep_encrypt(tx); | |
853 | case ALG_TKIP: | |
854 | return ieee80211_crypto_tkip_encrypt(tx); | |
855 | case ALG_CCMP: | |
856 | return ieee80211_crypto_ccmp_encrypt(tx); | |
3cfcf6ac JM |
857 | case ALG_AES_CMAC: |
858 | return ieee80211_crypto_aes_cmac_encrypt(tx); | |
e2454948 JB |
859 | } |
860 | ||
861 | /* not reached */ | |
862 | WARN_ON(1); | |
863 | return TX_DROP; | |
864 | } | |
865 | ||
d9e8a70f | 866 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
867 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
868 | { | |
2de8e0d9 JB |
869 | struct sk_buff *skb = tx->skb; |
870 | struct ieee80211_hdr *hdr; | |
871 | int next_len; | |
872 | bool group_addr; | |
03f93c3d | 873 | |
2de8e0d9 JB |
874 | do { |
875 | hdr = (void *) skb->data; | |
7e0aae47 JM |
876 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) |
877 | break; /* must not overwrite AID */ | |
2de8e0d9 JB |
878 | next_len = skb->next ? skb->next->len : 0; |
879 | group_addr = is_multicast_ether_addr(hdr->addr1); | |
03f93c3d | 880 | |
2de8e0d9 JB |
881 | hdr->duration_id = |
882 | ieee80211_duration(tx, group_addr, next_len); | |
883 | } while ((skb = skb->next)); | |
03f93c3d JB |
884 | |
885 | return TX_CONTINUE; | |
886 | } | |
887 | ||
d9e8a70f | 888 | static ieee80211_tx_result debug_noinline |
e2454948 | 889 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 890 | { |
2de8e0d9 | 891 | struct sk_buff *skb = tx->skb; |
e2ebc74d | 892 | |
9e72ebd6 JB |
893 | if (!tx->sta) |
894 | return TX_CONTINUE; | |
e2ebc74d | 895 | |
9e72ebd6 | 896 | tx->sta->tx_packets++; |
2de8e0d9 JB |
897 | do { |
898 | tx->sta->tx_fragments++; | |
899 | tx->sta->tx_bytes += skb->len; | |
900 | } while ((skb = skb->next)); | |
e2454948 | 901 | |
9ae54c84 | 902 | return TX_CONTINUE; |
e2ebc74d JB |
903 | } |
904 | ||
e2ebc74d JB |
905 | /* actual transmit path */ |
906 | ||
907 | /* | |
908 | * deal with packet injection down monitor interface | |
909 | * with Radiotap Header -- only called for monitor mode interface | |
910 | */ | |
27004b10 JB |
911 | static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
912 | struct sk_buff *skb) | |
e2ebc74d JB |
913 | { |
914 | /* | |
915 | * this is the moment to interpret and discard the radiotap header that | |
916 | * must be at the start of the packet injected in Monitor mode | |
917 | * | |
918 | * Need to take some care with endian-ness since radiotap | |
919 | * args are little-endian | |
920 | */ | |
921 | ||
922 | struct ieee80211_radiotap_iterator iterator; | |
923 | struct ieee80211_radiotap_header *rthdr = | |
924 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 925 | struct ieee80211_supported_band *sband; |
e2ebc74d JB |
926 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
927 | ||
2e92e6f2 | 928 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 929 | |
d0f09804 | 930 | skb->do_not_encrypt = 1; |
5cf121c3 | 931 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
932 | |
933 | /* | |
934 | * for every radiotap entry that is present | |
935 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
936 | * entries present, or -EINVAL on error) | |
937 | */ | |
938 | ||
939 | while (!ret) { | |
e2ebc74d JB |
940 | ret = ieee80211_radiotap_iterator_next(&iterator); |
941 | ||
942 | if (ret) | |
943 | continue; | |
944 | ||
945 | /* see if this argument is something we can use */ | |
946 | switch (iterator.this_arg_index) { | |
947 | /* | |
948 | * You must take care when dereferencing iterator.this_arg | |
949 | * for multibyte types... the pointer is not aligned. Use | |
950 | * get_unaligned((type *)iterator.this_arg) to dereference | |
951 | * iterator.this_arg for type "type" safely on all arches. | |
952 | */ | |
e2ebc74d JB |
953 | case IEEE80211_RADIOTAP_FLAGS: |
954 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
955 | /* | |
956 | * this indicates that the skb we have been | |
957 | * handed has the 32-bit FCS CRC at the end... | |
958 | * we should react to that by snipping it off | |
959 | * because it will be recomputed and added | |
960 | * on transmission | |
961 | */ | |
962 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
27004b10 | 963 | return false; |
e2ebc74d JB |
964 | |
965 | skb_trim(skb, skb->len - FCS_LEN); | |
966 | } | |
58d4185e | 967 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 968 | tx->skb->do_not_encrypt = 0; |
58d4185e | 969 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 970 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
971 | break; |
972 | ||
58d4185e JB |
973 | /* |
974 | * Please update the file | |
975 | * Documentation/networking/mac80211-injection.txt | |
976 | * when parsing new fields here. | |
977 | */ | |
978 | ||
e2ebc74d JB |
979 | default: |
980 | break; | |
981 | } | |
982 | } | |
983 | ||
984 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
27004b10 | 985 | return false; |
e2ebc74d JB |
986 | |
987 | /* | |
988 | * remove the radiotap header | |
989 | * iterator->max_length was sanity-checked against | |
990 | * skb->len by iterator init | |
991 | */ | |
992 | skb_pull(skb, iterator.max_length); | |
993 | ||
27004b10 | 994 | return true; |
e2ebc74d JB |
995 | } |
996 | ||
58d4185e JB |
997 | /* |
998 | * initialises @tx | |
999 | */ | |
9ae54c84 | 1000 | static ieee80211_tx_result |
5cf121c3 | 1001 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 1002 | struct sk_buff *skb, |
e039fa4a | 1003 | struct net_device *dev) |
e2ebc74d JB |
1004 | { |
1005 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 1006 | struct ieee80211_hdr *hdr; |
e2ebc74d | 1007 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 1008 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8b30b1fe S |
1009 | int hdrlen, tid; |
1010 | u8 *qc, *state; | |
cd8ffc80 | 1011 | bool queued = false; |
e2ebc74d JB |
1012 | |
1013 | memset(tx, 0, sizeof(*tx)); | |
1014 | tx->skb = skb; | |
1015 | tx->dev = dev; /* use original interface */ | |
1016 | tx->local = local; | |
1017 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 1018 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 1019 | /* |
58d4185e JB |
1020 | * Set this flag (used below to indicate "automatic fragmentation"), |
1021 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 1022 | */ |
5cf121c3 | 1023 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1024 | |
1025 | /* process and remove the injection radiotap header */ | |
1026 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
25d834e1 | 1027 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
27004b10 | 1028 | if (!__ieee80211_parse_tx_radiotap(tx, skb)) |
9ae54c84 | 1029 | return TX_DROP; |
58d4185e | 1030 | |
e2ebc74d | 1031 | /* |
58d4185e JB |
1032 | * __ieee80211_parse_tx_radiotap has now removed |
1033 | * the radiotap header that was present and pre-filled | |
1034 | * 'tx' with tx control information. | |
e2ebc74d | 1035 | */ |
e2ebc74d JB |
1036 | } |
1037 | ||
cd8ffc80 JB |
1038 | /* |
1039 | * If this flag is set to true anywhere, and we get here, | |
1040 | * we are doing the needed processing, so remove the flag | |
1041 | * now. | |
1042 | */ | |
1043 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1044 | ||
58d4185e JB |
1045 | hdr = (struct ieee80211_hdr *) skb->data; |
1046 | ||
24338793 | 1047 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 1048 | |
cd8ffc80 JB |
1049 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
1050 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { | |
96f5e66e | 1051 | unsigned long flags; |
cd8ffc80 JB |
1052 | struct tid_ampdu_tx *tid_tx; |
1053 | ||
8b30b1fe S |
1054 | qc = ieee80211_get_qos_ctl(hdr); |
1055 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1056 | ||
96f5e66e | 1057 | spin_lock_irqsave(&tx->sta->lock, flags); |
cd8ffc80 JB |
1058 | /* |
1059 | * XXX: This spinlock could be fairly expensive, but see the | |
1060 | * comment in agg-tx.c:ieee80211_agg_tx_operational(). | |
1061 | * One way to solve this would be to do something RCU-like | |
1062 | * for managing the tid_tx struct and using atomic bitops | |
1063 | * for the actual state -- by introducing an actual | |
1064 | * 'operational' bit that would be possible. It would | |
1065 | * require changing ieee80211_agg_tx_operational() to | |
1066 | * set that bit, and changing the way tid_tx is managed | |
1067 | * everywhere, including races between that bit and | |
1068 | * tid_tx going away (tid_tx being added can be easily | |
1069 | * committed to memory before the 'operational' bit). | |
1070 | */ | |
1071 | tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; | |
8b30b1fe | 1072 | state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; |
cd8ffc80 | 1073 | if (*state == HT_AGG_STATE_OPERATIONAL) { |
8b30b1fe | 1074 | info->flags |= IEEE80211_TX_CTL_AMPDU; |
cd8ffc80 JB |
1075 | } else if (*state != HT_AGG_STATE_IDLE) { |
1076 | /* in progress */ | |
1077 | queued = true; | |
1078 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1079 | __skb_queue_tail(&tid_tx->pending, skb); | |
1080 | } | |
96f5e66e | 1081 | spin_unlock_irqrestore(&tx->sta->lock, flags); |
cd8ffc80 JB |
1082 | |
1083 | if (unlikely(queued)) | |
1084 | return TX_QUEUED; | |
8b30b1fe S |
1085 | } |
1086 | ||
badffb72 | 1087 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1088 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1089 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1090 | } else { |
5cf121c3 | 1091 | tx->flags |= IEEE80211_TX_UNICAST; |
d3707d99 JB |
1092 | if (unlikely(local->wifi_wme_noack_test)) |
1093 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1094 | else | |
1095 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; | |
badffb72 | 1096 | } |
58d4185e | 1097 | |
5cf121c3 JB |
1098 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1099 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
b9a5f8ca | 1100 | skb->len + FCS_LEN > local->hw.wiphy->frag_threshold && |
8d5e0d58 | 1101 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
5cf121c3 | 1102 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1103 | else |
5cf121c3 | 1104 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1105 | } |
1106 | ||
e2ebc74d | 1107 | if (!tx->sta) |
e039fa4a | 1108 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1109 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1110 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1111 | |
b73d70ad | 1112 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1113 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1114 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1115 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1116 | } | |
e039fa4a | 1117 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1118 | |
9ae54c84 | 1119 | return TX_CONTINUE; |
e2ebc74d JB |
1120 | } |
1121 | ||
32bfd35d | 1122 | /* |
58d4185e JB |
1123 | * NB: @tx is uninitialised when passed in here |
1124 | */ | |
133b8226 JB |
1125 | static int ieee80211_tx_prepare(struct ieee80211_local *local, |
1126 | struct ieee80211_tx_data *tx, | |
1127 | struct sk_buff *skb) | |
e2ebc74d | 1128 | { |
e2ebc74d JB |
1129 | struct net_device *dev; |
1130 | ||
d0f09804 | 1131 | dev = dev_get_by_index(&init_net, skb->iif); |
133b8226 | 1132 | if (unlikely(dev && !is_ieee80211_device(local, dev))) { |
e2ebc74d JB |
1133 | dev_put(dev); |
1134 | dev = NULL; | |
1135 | } | |
1136 | if (unlikely(!dev)) | |
1137 | return -ENODEV; | |
cd8ffc80 JB |
1138 | /* |
1139 | * initialises tx with control | |
1140 | * | |
1141 | * return value is safe to ignore here because this function | |
1142 | * can only be invoked for multicast frames | |
1143 | * | |
1144 | * XXX: clean up | |
1145 | */ | |
e039fa4a | 1146 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1147 | dev_put(dev); |
e2ebc74d JB |
1148 | return 0; |
1149 | } | |
1150 | ||
2de8e0d9 | 1151 | static int __ieee80211_tx(struct ieee80211_local *local, |
1870cd71 JB |
1152 | struct sk_buff **skbp, |
1153 | struct sta_info *sta) | |
e2ebc74d | 1154 | { |
1870cd71 | 1155 | struct sk_buff *skb = *skbp, *next; |
f8e79ddd | 1156 | struct ieee80211_tx_info *info; |
a220858d | 1157 | int ret, len; |
2de8e0d9 | 1158 | bool fragm = false; |
e2ebc74d | 1159 | |
2de8e0d9 JB |
1160 | local->mdev->trans_start = jiffies; |
1161 | ||
1162 | while (skb) { | |
96f5e66e JB |
1163 | if (ieee80211_queue_stopped(&local->hw, |
1164 | skb_get_queue_mapping(skb))) | |
97d97b80 | 1165 | return IEEE80211_TX_PENDING; |
f8e79ddd | 1166 | |
f0e72851 JB |
1167 | info = IEEE80211_SKB_CB(skb); |
1168 | ||
1169 | if (fragm) | |
e6a9854b | 1170 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1171 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
f0e72851 | 1172 | |
2de8e0d9 | 1173 | next = skb->next; |
a220858d | 1174 | len = skb->len; |
24487981 | 1175 | ret = drv_tx(local, skb); |
a220858d JB |
1176 | if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { |
1177 | dev_kfree_skb(skb); | |
1178 | ret = NETDEV_TX_OK; | |
1179 | } | |
2de8e0d9 JB |
1180 | if (ret != NETDEV_TX_OK) |
1181 | return IEEE80211_TX_AGAIN; | |
1870cd71 | 1182 | *skbp = skb = next; |
2de8e0d9 JB |
1183 | ieee80211_led_tx(local, 1); |
1184 | fragm = true; | |
e2ebc74d | 1185 | } |
2de8e0d9 | 1186 | |
e2ebc74d JB |
1187 | return IEEE80211_TX_OK; |
1188 | } | |
1189 | ||
97b045d6 JB |
1190 | /* |
1191 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1192 | * frame was dropped or queued. | |
1193 | */ | |
1194 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1195 | { | |
97b045d6 | 1196 | struct sk_buff *skb = tx->skb; |
97b045d6 | 1197 | ieee80211_tx_result res = TX_DROP; |
97b045d6 | 1198 | |
d9e8a70f JB |
1199 | #define CALL_TXH(txh) \ |
1200 | res = txh(tx); \ | |
1201 | if (res != TX_CONTINUE) \ | |
1202 | goto txh_done; | |
1203 | ||
1204 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1205 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1206 | CALL_TXH(ieee80211_tx_h_select_key) | |
1207 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1208 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1209 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1210 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1211 | CALL_TXH(ieee80211_tx_h_fragment) |
1212 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1213 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1214 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1215 | CALL_TXH(ieee80211_tx_h_stats) | |
1216 | #undef CALL_TXH | |
97b045d6 | 1217 | |
d9e8a70f | 1218 | txh_done: |
97b045d6 | 1219 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1220 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
2de8e0d9 JB |
1221 | while (skb) { |
1222 | struct sk_buff *next; | |
1223 | ||
1224 | next = skb->next; | |
1225 | dev_kfree_skb(skb); | |
1226 | skb = next; | |
1227 | } | |
97b045d6 JB |
1228 | return -1; |
1229 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1230 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1231 | return -1; |
1232 | } | |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
cd8ffc80 JB |
1237 | static void ieee80211_tx(struct net_device *dev, struct sk_buff *skb, |
1238 | bool txpending) | |
e2ebc74d JB |
1239 | { |
1240 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
5cf121c3 | 1241 | struct ieee80211_tx_data tx; |
97b045d6 | 1242 | ieee80211_tx_result res_prepare; |
e039fa4a | 1243 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2a577d98 JB |
1244 | struct sk_buff *next; |
1245 | unsigned long flags; | |
1246 | int ret, retries; | |
e2530083 | 1247 | u16 queue; |
e2ebc74d | 1248 | |
e2530083 JB |
1249 | queue = skb_get_queue_mapping(skb); |
1250 | ||
cd8ffc80 | 1251 | WARN_ON(!txpending && !skb_queue_empty(&local->pending[queue])); |
e2ebc74d JB |
1252 | |
1253 | if (unlikely(skb->len < 10)) { | |
1254 | dev_kfree_skb(skb); | |
cd8ffc80 | 1255 | return; |
e2ebc74d JB |
1256 | } |
1257 | ||
d0709a65 JB |
1258 | rcu_read_lock(); |
1259 | ||
58d4185e | 1260 | /* initialises tx */ |
e039fa4a | 1261 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1262 | |
cd8ffc80 | 1263 | if (unlikely(res_prepare == TX_DROP)) { |
e2ebc74d | 1264 | dev_kfree_skb(skb); |
d0709a65 | 1265 | rcu_read_unlock(); |
cd8ffc80 JB |
1266 | return; |
1267 | } else if (unlikely(res_prepare == TX_QUEUED)) { | |
1268 | rcu_read_unlock(); | |
1269 | return; | |
e2ebc74d JB |
1270 | } |
1271 | ||
5cf121c3 | 1272 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1273 | info->band = tx.channel->band; |
e2ebc74d | 1274 | |
97b045d6 JB |
1275 | if (invoke_tx_handlers(&tx)) |
1276 | goto out; | |
e2ebc74d | 1277 | |
2a577d98 JB |
1278 | retries = 0; |
1279 | retry: | |
1870cd71 | 1280 | ret = __ieee80211_tx(local, &tx.skb, tx.sta); |
2a577d98 JB |
1281 | switch (ret) { |
1282 | case IEEE80211_TX_OK: | |
1283 | break; | |
1284 | case IEEE80211_TX_AGAIN: | |
eefce91a JB |
1285 | /* |
1286 | * Since there are no fragmented frames on A-MPDU | |
1287 | * queues, there's no reason for a driver to reject | |
1288 | * a frame there, warn and drop it. | |
1289 | */ | |
2a577d98 JB |
1290 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
1291 | goto drop; | |
1292 | /* fall through */ | |
1293 | case IEEE80211_TX_PENDING: | |
1294 | skb = tx.skb; | |
eefce91a | 1295 | |
2a577d98 | 1296 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
e2ebc74d | 1297 | |
2a577d98 JB |
1298 | if (__netif_subqueue_stopped(local->mdev, queue)) { |
1299 | do { | |
1300 | next = skb->next; | |
1301 | skb->next = NULL; | |
cd8ffc80 JB |
1302 | if (unlikely(txpending)) |
1303 | skb_queue_head(&local->pending[queue], | |
1304 | skb); | |
1305 | else | |
1306 | skb_queue_tail(&local->pending[queue], | |
1307 | skb); | |
2a577d98 JB |
1308 | } while ((skb = next)); |
1309 | ||
1310 | /* | |
1311 | * Make sure nobody will enable the queue on us | |
1312 | * (without going through the tasklet) nor disable the | |
1313 | * netdev queue underneath the pending handling code. | |
1314 | */ | |
1315 | __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING, | |
1316 | &local->queue_stop_reasons[queue]); | |
1317 | ||
1318 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, | |
1319 | flags); | |
1320 | } else { | |
1321 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, | |
1322 | flags); | |
1323 | ||
1324 | retries++; | |
1325 | if (WARN(retries > 10, "tx refused but queue active")) | |
1326 | goto drop; | |
e2ebc74d JB |
1327 | goto retry; |
1328 | } | |
e2ebc74d | 1329 | } |
97b045d6 | 1330 | out: |
d4e46a3d | 1331 | rcu_read_unlock(); |
cd8ffc80 | 1332 | return; |
e2ebc74d JB |
1333 | |
1334 | drop: | |
d4e46a3d | 1335 | rcu_read_unlock(); |
2de8e0d9 JB |
1336 | |
1337 | skb = tx.skb; | |
1338 | while (skb) { | |
2de8e0d9 JB |
1339 | next = skb->next; |
1340 | dev_kfree_skb(skb); | |
1341 | skb = next; | |
1342 | } | |
e2ebc74d JB |
1343 | } |
1344 | ||
1345 | /* device xmit handlers */ | |
1346 | ||
23c0752a JB |
1347 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1348 | struct sk_buff *skb, | |
1349 | int head_need, bool may_encrypt) | |
1350 | { | |
1351 | int tail_need = 0; | |
1352 | ||
1353 | /* | |
1354 | * This could be optimised, devices that do full hardware | |
1355 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1356 | * have no drivers for such devices currently. | |
1357 | */ | |
1358 | if (may_encrypt) { | |
1359 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1360 | tail_need -= skb_tailroom(skb); | |
1361 | tail_need = max_t(int, tail_need, 0); | |
1362 | } | |
1363 | ||
1364 | if (head_need || tail_need) { | |
1365 | /* Sorry. Can't account for this any more */ | |
1366 | skb_orphan(skb); | |
1367 | } | |
1368 | ||
1369 | if (skb_header_cloned(skb)) | |
1370 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1371 | else | |
1372 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1373 | ||
1374 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1375 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1376 | wiphy_name(local->hw.wiphy)); | |
1377 | return -ENOMEM; | |
1378 | } | |
1379 | ||
1380 | /* update truesize too */ | |
1381 | skb->truesize += head_need + tail_need; | |
1382 | ||
1383 | return 0; | |
1384 | } | |
1385 | ||
8ef9dad3 | 1386 | int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev) |
e2ebc74d | 1387 | { |
133b8226 JB |
1388 | struct ieee80211_master_priv *mpriv = netdev_priv(dev); |
1389 | struct ieee80211_local *local = mpriv->local; | |
e039fa4a | 1390 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1391 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1392 | struct net_device *odev = NULL; |
1393 | struct ieee80211_sub_if_data *osdata; | |
1394 | int headroom; | |
23c0752a | 1395 | bool may_encrypt; |
25d834e1 JB |
1396 | enum { |
1397 | NOT_MONITOR, | |
1398 | FOUND_SDATA, | |
1399 | UNKNOWN_ADDRESS, | |
1400 | } monitor_iface = NOT_MONITOR; | |
e2ebc74d | 1401 | |
d0f09804 JB |
1402 | if (skb->iif) |
1403 | odev = dev_get_by_index(&init_net, skb->iif); | |
133b8226 | 1404 | if (unlikely(odev && !is_ieee80211_device(local, odev))) { |
e2ebc74d JB |
1405 | dev_put(odev); |
1406 | odev = NULL; | |
1407 | } | |
1408 | if (unlikely(!odev)) { | |
1409 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1410 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1411 | "originating device\n", dev->name); | |
1412 | #endif | |
1413 | dev_kfree_skb(skb); | |
cd8ffc80 | 1414 | return NETDEV_TX_OK; |
e2ebc74d | 1415 | } |
e039fa4a | 1416 | |
4be8c387 | 1417 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
43f78531 LR |
1418 | local->hw.conf.dynamic_ps_timeout > 0 && |
1419 | !local->sw_scanning && !local->hw_scanning && local->ps_sdata) { | |
d063ed0f VN |
1420 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
1421 | ieee80211_stop_queues_by_reason(&local->hw, | |
1422 | IEEE80211_QUEUE_STOP_REASON_PS); | |
1423 | queue_work(local->hw.workqueue, | |
1424 | &local->dynamic_ps_disable_work); | |
1425 | } | |
1426 | ||
1427 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
46f2c4bd | 1428 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
d063ed0f VN |
1429 | } |
1430 | ||
d0f09804 JB |
1431 | memset(info, 0, sizeof(*info)); |
1432 | ||
1433 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1434 | ||
e2ebc74d JB |
1435 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1436 | ||
e32f85f7 LCC |
1437 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1438 | ieee80211_is_data(hdr->frame_control)) { | |
f74b6a54 RR |
1439 | if (is_multicast_ether_addr(hdr->addr3)) |
1440 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1441 | else | |
5dc306f3 BC |
1442 | if (mesh_nexthop_lookup(skb, osdata)) { |
1443 | dev_put(odev); | |
cd8ffc80 | 1444 | return NETDEV_TX_OK; |
5dc306f3 | 1445 | } |
f74b6a54 RR |
1446 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) |
1447 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh, | |
1448 | fwded_frames); | |
25d834e1 JB |
1449 | } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
1450 | struct ieee80211_sub_if_data *sdata; | |
25d834e1 JB |
1451 | int hdrlen; |
1452 | u16 len_rthdr; | |
1453 | ||
1454 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
1455 | monitor_iface = UNKNOWN_ADDRESS; | |
1456 | ||
1457 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
8ef86c7b | 1458 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); |
25d834e1 JB |
1459 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
1460 | ||
1461 | /* check the header is complete in the frame */ | |
1462 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1463 | /* | |
1464 | * We process outgoing injected frames that have a | |
1465 | * local address we handle as though they are our | |
1466 | * own frames. | |
1467 | * This code here isn't entirely correct, the local | |
1468 | * MAC address is not necessarily enough to find | |
1469 | * the interface to use; for that proper VLAN/WDS | |
1470 | * support we will need a different mechanism. | |
1471 | */ | |
1472 | ||
1473 | rcu_read_lock(); | |
1474 | list_for_each_entry_rcu(sdata, &local->interfaces, | |
1475 | list) { | |
1476 | if (!netif_running(sdata->dev)) | |
1477 | continue; | |
f1b33cb1 JB |
1478 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
1479 | continue; | |
25d834e1 JB |
1480 | if (compare_ether_addr(sdata->dev->dev_addr, |
1481 | hdr->addr2)) { | |
1482 | dev_hold(sdata->dev); | |
1483 | dev_put(odev); | |
1484 | osdata = sdata; | |
1485 | odev = osdata->dev; | |
1486 | skb->iif = sdata->dev->ifindex; | |
1487 | monitor_iface = FOUND_SDATA; | |
1488 | break; | |
1489 | } | |
1490 | } | |
1491 | rcu_read_unlock(); | |
1492 | } | |
e32f85f7 LCC |
1493 | } |
1494 | ||
d0f09804 | 1495 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1496 | |
1497 | headroom = osdata->local->tx_headroom; | |
1498 | if (may_encrypt) | |
1499 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1500 | headroom -= skb_headroom(skb); | |
1501 | headroom = max_t(int, 0, headroom); | |
1502 | ||
1503 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1504 | dev_kfree_skb(skb); | |
1505 | dev_put(odev); | |
cd8ffc80 | 1506 | return NETDEV_TX_OK; |
e2ebc74d JB |
1507 | } |
1508 | ||
30613070 JB |
1509 | if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
1510 | osdata = container_of(osdata->bss, | |
1511 | struct ieee80211_sub_if_data, | |
1512 | u.ap); | |
25d834e1 JB |
1513 | if (likely(monitor_iface != UNKNOWN_ADDRESS)) |
1514 | info->control.vif = &osdata->vif; | |
cd8ffc80 JB |
1515 | |
1516 | ieee80211_tx(odev, skb, false); | |
e2ebc74d JB |
1517 | dev_put(odev); |
1518 | ||
cd8ffc80 | 1519 | return NETDEV_TX_OK; |
e2ebc74d JB |
1520 | } |
1521 | ||
1522 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1523 | struct net_device *dev) | |
1524 | { | |
1525 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
47f4d887 | 1526 | struct ieee80211_channel *chan = local->hw.conf.channel; |
e2ebc74d JB |
1527 | struct ieee80211_radiotap_header *prthdr = |
1528 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1529 | u16 len_rthdr; |
e2ebc74d | 1530 | |
47f4d887 LR |
1531 | /* |
1532 | * Frame injection is not allowed if beaconing is not allowed | |
1533 | * or if we need radar detection. Beaconing is usually not allowed when | |
1534 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1535 | * Passive scan is also used in world regulatory domains where | |
1536 | * your country is not known and as such it should be treated as | |
1537 | * NO TX unless the channel is explicitly allowed in which case | |
1538 | * your current regulatory domain would not have the passive scan | |
1539 | * flag. | |
1540 | * | |
1541 | * Since AP mode uses monitor interfaces to inject/TX management | |
1542 | * frames we can make AP mode the exception to this rule once it | |
1543 | * supports radar detection as its implementation can deal with | |
1544 | * radar detection by itself. We can do that later by adding a | |
1545 | * monitor flag interfaces used for AP support. | |
1546 | */ | |
1547 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | | |
1548 | IEEE80211_CHAN_PASSIVE_SCAN))) | |
1549 | goto fail; | |
1550 | ||
9b8a74e3 AG |
1551 | /* check for not even having the fixed radiotap header part */ |
1552 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1553 | goto fail; /* too short to be possibly valid */ | |
1554 | ||
1555 | /* is it a header version we can trust to find length from? */ | |
1556 | if (unlikely(prthdr->it_version)) | |
1557 | goto fail; /* only version 0 is supported */ | |
1558 | ||
1559 | /* then there must be a radiotap header with a length we can use */ | |
1560 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1561 | ||
1562 | /* does the skb contain enough to deliver on the alleged length? */ | |
1563 | if (unlikely(skb->len < len_rthdr)) | |
1564 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1565 | |
1566 | skb->dev = local->mdev; | |
1567 | ||
9b8a74e3 | 1568 | /* needed because we set skb device to master */ |
d0f09804 | 1569 | skb->iif = dev->ifindex; |
9b8a74e3 | 1570 | |
d0f09804 JB |
1571 | /* sometimes we do encrypt injected frames, will be fixed |
1572 | * up in radiotap parser if not wanted */ | |
1573 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1574 | |
e2ebc74d JB |
1575 | /* |
1576 | * fix up the pointers accounting for the radiotap | |
1577 | * header still being in there. We are being given | |
1578 | * a precooked IEEE80211 header so no need for | |
1579 | * normal processing | |
1580 | */ | |
9b8a74e3 | 1581 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1582 | /* |
9b8a74e3 AG |
1583 | * these are just fixed to the end of the rt area since we |
1584 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1585 | */ |
9b8a74e3 AG |
1586 | skb_set_network_header(skb, len_rthdr); |
1587 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1588 | |
9b8a74e3 AG |
1589 | /* pass the radiotap header up to the next stage intact */ |
1590 | dev_queue_xmit(skb); | |
e2ebc74d | 1591 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1592 | |
1593 | fail: | |
1594 | dev_kfree_skb(skb); | |
1595 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1596 | } |
1597 | ||
1598 | /** | |
1599 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1600 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1601 | * @skb: packet to be sent | |
1602 | * @dev: incoming interface | |
1603 | * | |
1604 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1605 | * not be freed, and caller is responsible for either retrying later or freeing | |
1606 | * skb). | |
1607 | * | |
1608 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1609 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1610 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1611 | * transmission (through low-level driver). | |
1612 | */ | |
1613 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1614 | struct net_device *dev) | |
1615 | { | |
133b8226 JB |
1616 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1617 | struct ieee80211_local *local = sdata->local; | |
5b548140 | 1618 | int ret = NETDEV_TX_BUSY, head_need; |
065e9605 HH |
1619 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1620 | __le16 fc; | |
e2ebc74d | 1621 | struct ieee80211_hdr hdr; |
33b64eb2 | 1622 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1623 | const u8 *encaps_data; |
1624 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1625 | int nh_pos, h_pos; |
e2ebc74d | 1626 | struct sta_info *sta; |
ce3edf6d | 1627 | u32 sta_flags = 0; |
e2ebc74d | 1628 | |
e2ebc74d | 1629 | if (unlikely(skb->len < ETH_HLEN)) { |
ec634fe3 | 1630 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1631 | goto fail; |
1632 | } | |
1633 | ||
1634 | nh_pos = skb_network_header(skb) - skb->data; | |
1635 | h_pos = skb_transport_header(skb) - skb->data; | |
1636 | ||
1637 | /* convert Ethernet header to proper 802.11 header (based on | |
1638 | * operation mode) */ | |
1639 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1640 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1641 | |
51fb61e7 | 1642 | switch (sdata->vif.type) { |
05c914fe JB |
1643 | case NL80211_IFTYPE_AP: |
1644 | case NL80211_IFTYPE_AP_VLAN: | |
065e9605 | 1645 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1646 | /* DA BSSID SA */ |
1647 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1648 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1649 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1650 | hdrlen = 24; | |
cf966838 | 1651 | break; |
05c914fe | 1652 | case NL80211_IFTYPE_WDS: |
065e9605 | 1653 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1654 | /* RA TA DA SA */ |
1655 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1656 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1657 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1658 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1659 | hdrlen = 30; | |
cf966838 | 1660 | break; |
33b64eb2 | 1661 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1662 | case NL80211_IFTYPE_MESH_POINT: |
065e9605 | 1663 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
472dbc45 | 1664 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1665 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1666 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
ec634fe3 | 1667 | ret = NETDEV_TX_OK; |
e32f85f7 | 1668 | goto fail; |
33b64eb2 | 1669 | } |
79617dee Y |
1670 | memset(&mesh_hdr, 0, sizeof(mesh_hdr)); |
1671 | ||
1672 | if (compare_ether_addr(dev->dev_addr, | |
1673 | skb->data + ETH_ALEN) == 0) { | |
1674 | /* RA TA DA SA */ | |
1675 | memset(hdr.addr1, 0, ETH_ALEN); | |
1676 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1677 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1678 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1679 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); | |
1680 | } else { | |
1681 | /* packet from other interface */ | |
1682 | struct mesh_path *mppath; | |
1683 | ||
1684 | memset(hdr.addr1, 0, ETH_ALEN); | |
1685 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1686 | memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN); | |
1687 | ||
1688 | if (is_multicast_ether_addr(skb->data)) | |
1689 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1690 | else { | |
1691 | rcu_read_lock(); | |
1692 | mppath = mpp_path_lookup(skb->data, sdata); | |
1693 | if (mppath) | |
1694 | memcpy(hdr.addr3, mppath->mpp, ETH_ALEN); | |
1695 | else | |
1696 | memset(hdr.addr3, 0xff, ETH_ALEN); | |
1697 | rcu_read_unlock(); | |
1698 | } | |
1699 | ||
1700 | mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6; | |
1701 | mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; | |
1702 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum); | |
1703 | memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN); | |
1704 | memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1705 | sdata->u.mesh.mesh_seqnum++; | |
1706 | meshhdrlen = 18; | |
1707 | } | |
33b64eb2 LCC |
1708 | hdrlen = 30; |
1709 | break; | |
1710 | #endif | |
05c914fe | 1711 | case NL80211_IFTYPE_STATION: |
065e9605 | 1712 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d | 1713 | /* BSSID SA DA */ |
46900298 | 1714 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
e2ebc74d JB |
1715 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1716 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1717 | hdrlen = 24; | |
cf966838 | 1718 | break; |
05c914fe | 1719 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1720 | /* DA SA BSSID */ |
1721 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1722 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
46900298 | 1723 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
e2ebc74d | 1724 | hdrlen = 24; |
cf966838 JB |
1725 | break; |
1726 | default: | |
ec634fe3 | 1727 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1728 | goto fail; |
1729 | } | |
1730 | ||
7d185b8b JB |
1731 | /* |
1732 | * There's no need to try to look up the destination | |
1733 | * if it is a multicast address (which can only happen | |
1734 | * in AP mode) | |
1735 | */ | |
1736 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1737 | rcu_read_lock(); |
7d185b8b | 1738 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1739 | if (sta) |
07346f81 | 1740 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1741 | rcu_read_unlock(); |
e2ebc74d JB |
1742 | } |
1743 | ||
3434fbd3 | 1744 | /* receiver and we are QoS enabled, use a QoS type frame */ |
176be728 | 1745 | if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { |
065e9605 | 1746 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1747 | hdrlen += 2; |
1748 | } | |
1749 | ||
1750 | /* | |
238814fd JB |
1751 | * Drop unicast frames to unauthorised stations unless they are |
1752 | * EAPOL frames from the local station. | |
ce3edf6d | 1753 | */ |
e32f85f7 LCC |
1754 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1755 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1756 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1757 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1758 | compare_ether_addr(dev->dev_addr, |
1759 | skb->data + ETH_ALEN) == 0))) { | |
1760 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1761 | if (net_ratelimit()) |
0c68ae26 | 1762 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1763 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1764 | hdr.addr1); |
ce3edf6d JB |
1765 | #endif |
1766 | ||
1767 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1768 | ||
ec634fe3 | 1769 | ret = NETDEV_TX_OK; |
ce3edf6d JB |
1770 | goto fail; |
1771 | } | |
1772 | ||
065e9605 | 1773 | hdr.frame_control = fc; |
e2ebc74d JB |
1774 | hdr.duration_id = 0; |
1775 | hdr.seq_ctrl = 0; | |
1776 | ||
1777 | skip_header_bytes = ETH_HLEN; | |
1778 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1779 | encaps_data = bridge_tunnel_header; | |
1780 | encaps_len = sizeof(bridge_tunnel_header); | |
1781 | skip_header_bytes -= 2; | |
1782 | } else if (ethertype >= 0x600) { | |
1783 | encaps_data = rfc1042_header; | |
1784 | encaps_len = sizeof(rfc1042_header); | |
1785 | skip_header_bytes -= 2; | |
1786 | } else { | |
1787 | encaps_data = NULL; | |
1788 | encaps_len = 0; | |
1789 | } | |
1790 | ||
1791 | skb_pull(skb, skip_header_bytes); | |
1792 | nh_pos -= skip_header_bytes; | |
1793 | h_pos -= skip_header_bytes; | |
1794 | ||
23c0752a | 1795 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1796 | |
23c0752a JB |
1797 | /* |
1798 | * So we need to modify the skb header and hence need a copy of | |
1799 | * that. The head_need variable above doesn't, so far, include | |
1800 | * the needed header space that we don't need right away. If we | |
1801 | * can, then we don't reallocate right now but only after the | |
1802 | * frame arrives at the master device (if it does...) | |
1803 | * | |
1804 | * If we cannot, however, then we will reallocate to include all | |
1805 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1806 | * make it big enough for everything we may ever need. | |
1807 | */ | |
e2ebc74d | 1808 | |
3a5be7d4 | 1809 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1810 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1811 | head_need += local->tx_headroom; | |
1812 | head_need = max_t(int, 0, head_need); | |
1813 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1814 | goto fail; |
e2ebc74d JB |
1815 | } |
1816 | ||
1817 | if (encaps_data) { | |
1818 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1819 | nh_pos += encaps_len; | |
1820 | h_pos += encaps_len; | |
1821 | } | |
c29b9b9b | 1822 | |
33b64eb2 LCC |
1823 | if (meshhdrlen > 0) { |
1824 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1825 | nh_pos += meshhdrlen; | |
1826 | h_pos += meshhdrlen; | |
1827 | } | |
1828 | ||
065e9605 | 1829 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1830 | __le16 *qos_control; |
1831 | ||
1832 | qos_control = (__le16*) skb_push(skb, 2); | |
1833 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1834 | /* | |
1835 | * Maybe we could actually set some fields here, for now just | |
1836 | * initialise to zero to indicate no special operation. | |
1837 | */ | |
1838 | *qos_control = 0; | |
1839 | } else | |
1840 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1841 | ||
e2ebc74d JB |
1842 | nh_pos += hdrlen; |
1843 | h_pos += hdrlen; | |
1844 | ||
d0f09804 | 1845 | skb->iif = dev->ifindex; |
b0a67179 | 1846 | |
e2ebc74d | 1847 | skb->dev = local->mdev; |
68aae116 SH |
1848 | dev->stats.tx_packets++; |
1849 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1850 | |
1851 | /* Update skb pointers to various headers since this modified frame | |
1852 | * is going to go through Linux networking code that may potentially | |
1853 | * need things like pointer to IP header. */ | |
1854 | skb_set_mac_header(skb, 0); | |
1855 | skb_set_network_header(skb, nh_pos); | |
1856 | skb_set_transport_header(skb, h_pos); | |
1857 | ||
1858 | dev->trans_start = jiffies; | |
1859 | dev_queue_xmit(skb); | |
1860 | ||
ec634fe3 | 1861 | return NETDEV_TX_OK; |
e2ebc74d JB |
1862 | |
1863 | fail: | |
ec634fe3 | 1864 | if (ret == NETDEV_TX_OK) |
e2ebc74d JB |
1865 | dev_kfree_skb(skb); |
1866 | ||
1867 | return ret; | |
1868 | } | |
1869 | ||
e2ebc74d | 1870 | |
e2530083 JB |
1871 | /* |
1872 | * ieee80211_clear_tx_pending may not be called in a context where | |
1873 | * it is possible that it packets could come in again. | |
1874 | */ | |
e2ebc74d JB |
1875 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1876 | { | |
2de8e0d9 | 1877 | int i; |
e2ebc74d | 1878 | |
2a577d98 JB |
1879 | for (i = 0; i < local->hw.queues; i++) |
1880 | skb_queue_purge(&local->pending[i]); | |
e2ebc74d JB |
1881 | } |
1882 | ||
cd8ffc80 JB |
1883 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
1884 | struct sk_buff *skb) | |
1885 | { | |
1886 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1887 | struct ieee80211_sub_if_data *sdata; | |
1888 | struct sta_info *sta; | |
1889 | struct ieee80211_hdr *hdr; | |
1890 | struct net_device *dev; | |
1891 | int ret; | |
1892 | bool result = true; | |
1893 | ||
1894 | /* does interface still exist? */ | |
1895 | dev = dev_get_by_index(&init_net, skb->iif); | |
1896 | if (!dev) { | |
1897 | dev_kfree_skb(skb); | |
1898 | return true; | |
1899 | } | |
1900 | ||
1901 | /* validate info->control.vif against skb->iif */ | |
1902 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1903 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
1904 | sdata = container_of(sdata->bss, | |
1905 | struct ieee80211_sub_if_data, | |
1906 | u.ap); | |
1907 | ||
1908 | if (unlikely(info->control.vif && info->control.vif != &sdata->vif)) { | |
1909 | dev_kfree_skb(skb); | |
1910 | result = true; | |
1911 | goto out; | |
1912 | } | |
1913 | ||
1914 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { | |
1915 | ieee80211_tx(dev, skb, true); | |
1916 | } else { | |
1917 | hdr = (struct ieee80211_hdr *)skb->data; | |
1918 | sta = sta_info_get(local, hdr->addr1); | |
1919 | ||
1920 | ret = __ieee80211_tx(local, &skb, sta); | |
1921 | if (ret != IEEE80211_TX_OK) | |
1922 | result = false; | |
1923 | } | |
1924 | ||
1925 | out: | |
1926 | dev_put(dev); | |
1927 | ||
1928 | return result; | |
1929 | } | |
1930 | ||
e2530083 JB |
1931 | /* |
1932 | * Transmit all pending packets. Called from tasklet, locks master device | |
1933 | * TX lock so that no new packets can come in. | |
1934 | */ | |
e2ebc74d JB |
1935 | void ieee80211_tx_pending(unsigned long data) |
1936 | { | |
1937 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1938 | struct net_device *dev = local->mdev; | |
2a577d98 | 1939 | unsigned long flags; |
cd8ffc80 | 1940 | int i; |
2a577d98 | 1941 | bool next; |
e2ebc74d | 1942 | |
f0e72851 | 1943 | rcu_read_lock(); |
e2ebc74d | 1944 | netif_tx_lock_bh(dev); |
e2530083 | 1945 | |
2a577d98 JB |
1946 | for (i = 0; i < local->hw.queues; i++) { |
1947 | /* | |
1948 | * If queue is stopped by something other than due to pending | |
1949 | * frames, or we have no pending frames, proceed to next queue. | |
1950 | */ | |
1951 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
1952 | next = false; | |
1953 | if (local->queue_stop_reasons[i] != | |
1954 | BIT(IEEE80211_QUEUE_STOP_REASON_PENDING) || | |
1955 | skb_queue_empty(&local->pending[i])) | |
1956 | next = true; | |
1957 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
1958 | ||
1959 | if (next) | |
e2ebc74d | 1960 | continue; |
e2530083 | 1961 | |
2a577d98 JB |
1962 | /* |
1963 | * start the queue now to allow processing our packets, | |
1964 | * we're under the tx lock here anyway so nothing will | |
1965 | * happen as a result of this | |
1966 | */ | |
f8e79ddd TW |
1967 | netif_start_subqueue(local->mdev, i); |
1968 | ||
2a577d98 | 1969 | while (!skb_queue_empty(&local->pending[i])) { |
1870cd71 | 1970 | struct sk_buff *skb = skb_dequeue(&local->pending[i]); |
2a577d98 | 1971 | |
cd8ffc80 | 1972 | if (!ieee80211_tx_pending_skb(local, skb)) { |
1870cd71 | 1973 | skb_queue_head(&local->pending[i], skb); |
2a577d98 JB |
1974 | break; |
1975 | } | |
e2ebc74d | 1976 | } |
2a577d98 JB |
1977 | |
1978 | /* Start regular packet processing again. */ | |
1979 | if (skb_queue_empty(&local->pending[i])) | |
1980 | ieee80211_wake_queue_by_reason(&local->hw, i, | |
1981 | IEEE80211_QUEUE_STOP_REASON_PENDING); | |
e2ebc74d | 1982 | } |
2a577d98 | 1983 | |
e2ebc74d | 1984 | netif_tx_unlock_bh(dev); |
f0e72851 | 1985 | rcu_read_unlock(); |
e2ebc74d JB |
1986 | } |
1987 | ||
1988 | /* functions for drivers to get certain frames */ | |
1989 | ||
8e7be8da | 1990 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
1991 | struct sk_buff *skb, |
1992 | struct beacon_data *beacon) | |
e2ebc74d JB |
1993 | { |
1994 | u8 *pos, *tim; | |
1995 | int aid0 = 0; | |
1996 | int i, have_bits = 0, n1, n2; | |
1997 | ||
1998 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1999 | * mode. */ | |
e2ebc74d JB |
2000 | if (atomic_read(&bss->num_sta_ps) > 0) |
2001 | /* in the hope that this is faster than | |
2002 | * checking byte-for-byte */ | |
2003 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
2004 | IEEE80211_MAX_AID+1); | |
2005 | ||
2006 | if (bss->dtim_count == 0) | |
5dfdaf58 | 2007 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
2008 | else |
2009 | bss->dtim_count--; | |
2010 | ||
2011 | tim = pos = (u8 *) skb_put(skb, 6); | |
2012 | *pos++ = WLAN_EID_TIM; | |
2013 | *pos++ = 4; | |
2014 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 2015 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
2016 | |
2017 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
2018 | aid0 = 1; | |
2019 | ||
2020 | if (have_bits) { | |
2021 | /* Find largest even number N1 so that bits numbered 1 through | |
2022 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
2023 | * (N2 + 1) x 8 through 2007 are 0. */ | |
2024 | n1 = 0; | |
2025 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
2026 | if (bss->tim[i]) { | |
2027 | n1 = i & 0xfe; | |
2028 | break; | |
2029 | } | |
2030 | } | |
2031 | n2 = n1; | |
2032 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
2033 | if (bss->tim[i]) { | |
2034 | n2 = i; | |
2035 | break; | |
2036 | } | |
2037 | } | |
2038 | ||
2039 | /* Bitmap control */ | |
2040 | *pos++ = n1 | aid0; | |
2041 | /* Part Virt Bitmap */ | |
2042 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
2043 | ||
2044 | tim[1] = n2 - n1 + 4; | |
2045 | skb_put(skb, n2 - n1); | |
2046 | } else { | |
2047 | *pos++ = aid0; /* Bitmap control */ | |
2048 | *pos++ = 0; /* Part Virt Bitmap */ | |
2049 | } | |
e2ebc74d JB |
2050 | } |
2051 | ||
32bfd35d | 2052 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 2053 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2054 | { |
2055 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 2056 | struct sk_buff *skb = NULL; |
e039fa4a | 2057 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
2058 | struct ieee80211_sub_if_data *sdata = NULL; |
2059 | struct ieee80211_if_ap *ap = NULL; | |
5dfdaf58 | 2060 | struct beacon_data *beacon; |
8318d78a | 2061 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 2062 | enum ieee80211_band band = local->hw.conf.channel->band; |
8318d78a | 2063 | |
2e92e6f2 | 2064 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
2065 | |
2066 | rcu_read_lock(); | |
e2ebc74d | 2067 | |
32bfd35d | 2068 | sdata = vif_to_sdata(vif); |
e2ebc74d | 2069 | |
05c914fe | 2070 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
2071 | ap = &sdata->u.ap; |
2072 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
2073 | if (ap && beacon) { |
2074 | /* | |
2075 | * headroom, head length, | |
2076 | * tail length and maximum TIM length | |
2077 | */ | |
2078 | skb = dev_alloc_skb(local->tx_headroom + | |
2079 | beacon->head_len + | |
2080 | beacon->tail_len + 256); | |
2081 | if (!skb) | |
2082 | goto out; | |
33b64eb2 | 2083 | |
902acc78 JB |
2084 | skb_reserve(skb, local->tx_headroom); |
2085 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
2086 | beacon->head_len); | |
33b64eb2 | 2087 | |
d0709a65 JB |
2088 | /* |
2089 | * Not very nice, but we want to allow the driver to call | |
2090 | * ieee80211_beacon_get() as a response to the set_tim() | |
2091 | * callback. That, however, is already invoked under the | |
2092 | * sta_lock to guarantee consistent and race-free update | |
2093 | * of the tim bitmap in mac80211 and the driver. | |
2094 | */ | |
2095 | if (local->tim_in_locked_section) { | |
8e7be8da | 2096 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2097 | } else { |
2098 | unsigned long flags; | |
2099 | ||
2100 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 2101 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2102 | spin_unlock_irqrestore(&local->sta_lock, flags); |
2103 | } | |
33b64eb2 | 2104 | |
902acc78 JB |
2105 | if (beacon->tail) |
2106 | memcpy(skb_put(skb, beacon->tail_len), | |
2107 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
2108 | } else |
2109 | goto out; | |
05c914fe | 2110 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
46900298 | 2111 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
9d139c81 | 2112 | struct ieee80211_hdr *hdr; |
af8cdcd8 | 2113 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
33b64eb2 | 2114 | |
af8cdcd8 | 2115 | if (!presp) |
9d139c81 JB |
2116 | goto out; |
2117 | ||
af8cdcd8 | 2118 | skb = skb_copy(presp, GFP_ATOMIC); |
9d139c81 JB |
2119 | if (!skb) |
2120 | goto out; | |
2121 | ||
2122 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
2123 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2124 | IEEE80211_STYPE_BEACON); | |
902acc78 | 2125 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
2126 | struct ieee80211_mgmt *mgmt; |
2127 | u8 *pos; | |
2128 | ||
902acc78 JB |
2129 | /* headroom, head length, tail length and maximum TIM length */ |
2130 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
2131 | if (!skb) | |
2132 | goto out; | |
2133 | ||
2134 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2135 | mgmt = (struct ieee80211_mgmt *) | |
2136 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
2137 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
2138 | mgmt->frame_control = |
2139 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
2140 | memset(mgmt->da, 0xff, ETH_ALEN); |
2141 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
2142 | /* BSSID is left zeroed, wildcard value */ | |
2143 | mgmt->u.beacon.beacon_int = | |
57c4d7b4 | 2144 | cpu_to_le16(sdata->vif.bss_conf.beacon_int); |
902acc78 JB |
2145 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ |
2146 | ||
2147 | pos = skb_put(skb, 2); | |
2148 | *pos++ = WLAN_EID_SSID; | |
2149 | *pos++ = 0x0; | |
2150 | ||
f698d856 | 2151 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
2152 | } else { |
2153 | WARN_ON(1); | |
5dfdaf58 | 2154 | goto out; |
e2ebc74d JB |
2155 | } |
2156 | ||
e039fa4a JB |
2157 | info = IEEE80211_SKB_CB(skb); |
2158 | ||
d0f09804 JB |
2159 | skb->do_not_encrypt = 1; |
2160 | ||
e039fa4a | 2161 | info->band = band; |
e6a9854b JB |
2162 | /* |
2163 | * XXX: For now, always use the lowest rate | |
2164 | */ | |
2165 | info->control.rates[0].idx = 0; | |
2166 | info->control.rates[0].count = 1; | |
2167 | info->control.rates[1].idx = -1; | |
2168 | info->control.rates[2].idx = -1; | |
2169 | info->control.rates[3].idx = -1; | |
2170 | info->control.rates[4].idx = -1; | |
2171 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
e039fa4a JB |
2172 | |
2173 | info->control.vif = vif; | |
f591fa5d JB |
2174 | |
2175 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
2176 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
2177 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e6a9854b | 2178 | out: |
5dfdaf58 | 2179 | rcu_read_unlock(); |
e2ebc74d JB |
2180 | return skb; |
2181 | } | |
2182 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
2183 | ||
32bfd35d | 2184 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2185 | const void *frame, size_t frame_len, |
e039fa4a | 2186 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2187 | struct ieee80211_rts *rts) |
2188 | { | |
2189 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2190 | |
065e9605 HH |
2191 | rts->frame_control = |
2192 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
2193 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2194 | frame_txctl); | |
e2ebc74d JB |
2195 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2196 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2197 | } | |
2198 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2199 | ||
32bfd35d | 2200 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2201 | const void *frame, size_t frame_len, |
e039fa4a | 2202 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2203 | struct ieee80211_cts *cts) |
2204 | { | |
2205 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2206 | |
065e9605 HH |
2207 | cts->frame_control = |
2208 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2209 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2210 | frame_len, frame_txctl); | |
e2ebc74d JB |
2211 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2212 | } | |
2213 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2214 | ||
2215 | struct sk_buff * | |
32bfd35d | 2216 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2217 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2218 | { |
2219 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2220 | struct sk_buff *skb = NULL; |
e2ebc74d | 2221 | struct sta_info *sta; |
5cf121c3 | 2222 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2223 | struct ieee80211_sub_if_data *sdata; |
2224 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2225 | struct beacon_data *beacon; |
e039fa4a | 2226 | struct ieee80211_tx_info *info; |
e2ebc74d | 2227 | |
32bfd35d | 2228 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2229 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2230 | |
2231 | if (!bss) | |
e2ebc74d JB |
2232 | return NULL; |
2233 | ||
5dfdaf58 JB |
2234 | rcu_read_lock(); |
2235 | beacon = rcu_dereference(bss->beacon); | |
2236 | ||
05c914fe | 2237 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2238 | goto out; |
5dfdaf58 | 2239 | |
e2ebc74d | 2240 | if (bss->dtim_count != 0) |
747cf5e9 | 2241 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2242 | |
e2ebc74d JB |
2243 | while (1) { |
2244 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2245 | if (!skb) | |
747cf5e9 | 2246 | goto out; |
e2ebc74d JB |
2247 | local->total_ps_buffered--; |
2248 | ||
2249 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2250 | struct ieee80211_hdr *hdr = | |
2251 | (struct ieee80211_hdr *) skb->data; | |
2252 | /* more buffered multicast/broadcast frames ==> set | |
2253 | * MoreData flag in IEEE 802.11 header to inform PS | |
2254 | * STAs */ | |
2255 | hdr->frame_control |= | |
2256 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2257 | } | |
2258 | ||
133b8226 | 2259 | if (!ieee80211_tx_prepare(local, &tx, skb)) |
e2ebc74d JB |
2260 | break; |
2261 | dev_kfree_skb_any(skb); | |
2262 | } | |
e039fa4a JB |
2263 | |
2264 | info = IEEE80211_SKB_CB(skb); | |
2265 | ||
e2ebc74d | 2266 | sta = tx.sta; |
5cf121c3 JB |
2267 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2268 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2269 | info->band = tx.channel->band; |
e2ebc74d | 2270 | |
97b045d6 | 2271 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2272 | skb = NULL; |
97b045d6 | 2273 | out: |
d0709a65 | 2274 | rcu_read_unlock(); |
e2ebc74d JB |
2275 | |
2276 | return skb; | |
2277 | } | |
2278 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |