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" | |
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 */ | |
5c1b98a5 KV |
183 | static ieee80211_tx_result debug_noinline |
184 | ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) | |
185 | { | |
186 | struct ieee80211_local *local = tx->local; | |
0c74211d | 187 | struct ieee80211_if_managed *ifmgd; |
5c1b98a5 KV |
188 | |
189 | /* driver doesn't support power save */ | |
190 | if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) | |
191 | return TX_CONTINUE; | |
192 | ||
193 | /* hardware does dynamic power save */ | |
194 | if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) | |
195 | return TX_CONTINUE; | |
196 | ||
197 | /* dynamic power save disabled */ | |
198 | if (local->hw.conf.dynamic_ps_timeout <= 0) | |
199 | return TX_CONTINUE; | |
200 | ||
201 | /* we are scanning, don't enable power save */ | |
202 | if (local->scanning) | |
203 | return TX_CONTINUE; | |
204 | ||
205 | if (!local->ps_sdata) | |
206 | return TX_CONTINUE; | |
207 | ||
208 | /* No point if we're going to suspend */ | |
209 | if (local->quiescing) | |
210 | return TX_CONTINUE; | |
211 | ||
0c74211d KV |
212 | /* dynamic ps is supported only in managed mode */ |
213 | if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) | |
214 | return TX_CONTINUE; | |
215 | ||
216 | ifmgd = &tx->sdata->u.mgd; | |
217 | ||
218 | /* | |
219 | * Don't wakeup from power save if u-apsd is enabled, voip ac has | |
220 | * u-apsd enabled and the frame is in voip class. This effectively | |
221 | * means that even if all access categories have u-apsd enabled, in | |
222 | * practise u-apsd is only used with the voip ac. This is a | |
223 | * workaround for the case when received voip class packets do not | |
224 | * have correct qos tag for some reason, due the network or the | |
225 | * peer application. | |
226 | * | |
227 | * Note: local->uapsd_queues access is racy here. If the value is | |
228 | * changed via debugfs, user needs to reassociate manually to have | |
229 | * everything in sync. | |
230 | */ | |
231 | if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) | |
232 | && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) | |
233 | && skb_get_queue_mapping(tx->skb) == 0) | |
234 | return TX_CONTINUE; | |
235 | ||
5c1b98a5 KV |
236 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
237 | ieee80211_stop_queues_by_reason(&local->hw, | |
238 | IEEE80211_QUEUE_STOP_REASON_PS); | |
239 | ieee80211_queue_work(&local->hw, | |
240 | &local->dynamic_ps_disable_work); | |
241 | } | |
242 | ||
243 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
244 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
245 | ||
246 | return TX_CONTINUE; | |
247 | } | |
e2ebc74d | 248 | |
d9e8a70f | 249 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 250 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 251 | { |
358c8d9d | 252 | |
e039fa4a | 253 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 254 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
255 | u32 sta_flags; |
256 | ||
e039fa4a | 257 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 258 | return TX_CONTINUE; |
58d4185e | 259 | |
142b9f50 | 260 | if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) && |
a9a6ffff KV |
261 | !ieee80211_is_probe_req(hdr->frame_control) && |
262 | !ieee80211_is_nullfunc(hdr->frame_control)) | |
263 | /* | |
264 | * When software scanning only nullfunc frames (to notify | |
265 | * the sleep state to the AP) and probe requests (for the | |
266 | * active scan) are allowed, all other frames should not be | |
267 | * sent and we should not get here, but if we do | |
268 | * nonetheless, drop them to avoid sending them | |
269 | * off-channel. See the link below and | |
270 | * ieee80211_start_scan() for more. | |
271 | * | |
272 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 | |
273 | */ | |
9ae54c84 | 274 | return TX_DROP; |
e2ebc74d | 275 | |
05c914fe | 276 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
277 | return TX_CONTINUE; |
278 | ||
5cf121c3 | 279 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 280 | return TX_CONTINUE; |
e2ebc74d | 281 | |
07346f81 | 282 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 283 | |
5cf121c3 | 284 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 285 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 286 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 287 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
288 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
289 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 | 290 | "associated station %pM\n", |
47846c9b | 291 | tx->sdata->name, hdr->addr1); |
e2ebc74d JB |
292 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
293 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 294 | return TX_DROP; |
e2ebc74d JB |
295 | } |
296 | } else { | |
358c8d9d | 297 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 298 | tx->local->num_sta == 0 && |
05c914fe | 299 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
300 | /* |
301 | * No associated STAs - no need to send multicast | |
302 | * frames. | |
303 | */ | |
9ae54c84 | 304 | return TX_DROP; |
e2ebc74d | 305 | } |
9ae54c84 | 306 | return TX_CONTINUE; |
e2ebc74d JB |
307 | } |
308 | ||
9ae54c84 | 309 | return TX_CONTINUE; |
e2ebc74d JB |
310 | } |
311 | ||
e2ebc74d JB |
312 | /* This function is called whenever the AP is about to exceed the maximum limit |
313 | * of buffered frames for power saving STAs. This situation should not really | |
314 | * happen often during normal operation, so dropping the oldest buffered packet | |
315 | * from each queue should be OK to make some room for new frames. */ | |
316 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
317 | { | |
318 | int total = 0, purged = 0; | |
319 | struct sk_buff *skb; | |
320 | struct ieee80211_sub_if_data *sdata; | |
321 | struct sta_info *sta; | |
322 | ||
79010420 JB |
323 | /* |
324 | * virtual interfaces are protected by RCU | |
325 | */ | |
326 | rcu_read_lock(); | |
327 | ||
328 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 329 | struct ieee80211_if_ap *ap; |
05c914fe | 330 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
331 | continue; |
332 | ap = &sdata->u.ap; | |
333 | skb = skb_dequeue(&ap->ps_bc_buf); | |
334 | if (skb) { | |
335 | purged++; | |
336 | dev_kfree_skb(skb); | |
337 | } | |
338 | total += skb_queue_len(&ap->ps_bc_buf); | |
339 | } | |
e2ebc74d | 340 | |
d0709a65 | 341 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
342 | skb = skb_dequeue(&sta->ps_tx_buf); |
343 | if (skb) { | |
344 | purged++; | |
345 | dev_kfree_skb(skb); | |
346 | } | |
347 | total += skb_queue_len(&sta->ps_tx_buf); | |
348 | } | |
d0709a65 JB |
349 | |
350 | rcu_read_unlock(); | |
e2ebc74d JB |
351 | |
352 | local->total_ps_buffered = total; | |
54223995 | 353 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 354 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 355 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 356 | #endif |
e2ebc74d JB |
357 | } |
358 | ||
9ae54c84 | 359 | static ieee80211_tx_result |
5cf121c3 | 360 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 361 | { |
e039fa4a | 362 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 363 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 364 | |
7d54d0dd JB |
365 | /* |
366 | * broadcast/multicast frame | |
367 | * | |
368 | * If any of the associated stations is in power save mode, | |
369 | * the frame is buffered to be sent after DTIM beacon frame. | |
370 | * This is done either by the hardware or us. | |
371 | */ | |
372 | ||
3e122be0 JB |
373 | /* powersaving STAs only in AP/VLAN mode */ |
374 | if (!tx->sdata->bss) | |
375 | return TX_CONTINUE; | |
376 | ||
377 | /* no buffering for ordered frames */ | |
358c8d9d | 378 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 379 | return TX_CONTINUE; |
7d54d0dd JB |
380 | |
381 | /* no stations in PS mode */ | |
382 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 383 | return TX_CONTINUE; |
7d54d0dd | 384 | |
62b517cb | 385 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
62b1208e | 386 | |
62b517cb JB |
387 | /* device releases frame after DTIM beacon */ |
388 | if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) | |
62b1208e | 389 | return TX_CONTINUE; |
62b1208e | 390 | |
7d54d0dd | 391 | /* buffered in mac80211 */ |
62b1208e JB |
392 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
393 | purge_old_ps_buffers(tx->local); | |
394 | ||
395 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { | |
54223995 | 396 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
62b1208e JB |
397 | if (net_ratelimit()) |
398 | printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", | |
47846c9b | 399 | tx->sdata->name); |
f4ea83dd | 400 | #endif |
62b1208e JB |
401 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
402 | } else | |
403 | tx->local->total_ps_buffered++; | |
e2ebc74d | 404 | |
62b1208e | 405 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); |
7d54d0dd | 406 | |
62b1208e | 407 | return TX_QUEUED; |
e2ebc74d JB |
408 | } |
409 | ||
fb733336 JM |
410 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
411 | struct sk_buff *skb) | |
412 | { | |
413 | if (!ieee80211_is_mgmt(fc)) | |
414 | return 0; | |
415 | ||
416 | if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) | |
417 | return 0; | |
418 | ||
419 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) | |
420 | skb->data)) | |
421 | return 0; | |
422 | ||
423 | return 1; | |
424 | } | |
425 | ||
9ae54c84 | 426 | static ieee80211_tx_result |
5cf121c3 | 427 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
428 | { |
429 | struct sta_info *sta = tx->sta; | |
e039fa4a | 430 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 431 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
3393a608 | 432 | struct ieee80211_local *local = tx->local; |
07346f81 | 433 | u32 staflags; |
e2ebc74d | 434 | |
f64f9e71 JP |
435 | if (unlikely(!sta || |
436 | ieee80211_is_probe_resp(hdr->frame_control) || | |
437 | ieee80211_is_auth(hdr->frame_control) || | |
438 | ieee80211_is_assoc_resp(hdr->frame_control) || | |
439 | ieee80211_is_reassoc_resp(hdr->frame_control))) | |
9ae54c84 | 440 | return TX_CONTINUE; |
e2ebc74d | 441 | |
07346f81 JB |
442 | staflags = get_sta_flags(sta); |
443 | ||
af818581 | 444 | if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) && |
3fa52056 | 445 | !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) { |
e2ebc74d | 446 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 447 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
e2ebc74d | 448 | "before %d)\n", |
0c68ae26 | 449 | sta->sta.addr, sta->sta.aid, |
e2ebc74d JB |
450 | skb_queue_len(&sta->ps_tx_buf)); |
451 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
452 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
453 | purge_old_ps_buffers(tx->local); | |
454 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
455 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 456 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 457 | if (net_ratelimit()) { |
0c68ae26 | 458 | printk(KERN_DEBUG "%s: STA %pM TX " |
e2ebc74d | 459 | "buffer full - dropping oldest frame\n", |
47846c9b | 460 | tx->sdata->name, sta->sta.addr); |
e2ebc74d | 461 | } |
f4ea83dd | 462 | #endif |
e2ebc74d JB |
463 | dev_kfree_skb(old); |
464 | } else | |
465 | tx->local->total_ps_buffered++; | |
004c872e | 466 | |
af818581 JB |
467 | /* |
468 | * Queue frame to be sent after STA wakes up/polls, | |
469 | * but don't set the TIM bit if the driver is blocking | |
470 | * wakeup or poll response transmissions anyway. | |
471 | */ | |
472 | if (skb_queue_empty(&sta->ps_tx_buf) && | |
473 | !(staflags & WLAN_STA_PS_DRIVER)) | |
004c872e JB |
474 | sta_info_set_tim_bit(sta); |
475 | ||
e039fa4a | 476 | info->control.jiffies = jiffies; |
5061b0c2 | 477 | info->control.vif = &tx->sdata->vif; |
8f77f384 | 478 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
e2ebc74d | 479 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
3393a608 JO |
480 | |
481 | if (!timer_pending(&local->sta_cleanup)) | |
482 | mod_timer(&local->sta_cleanup, | |
483 | round_jiffies(jiffies + | |
484 | STA_INFO_CLEANUP_INTERVAL)); | |
485 | ||
9ae54c84 | 486 | return TX_QUEUED; |
e2ebc74d JB |
487 | } |
488 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
af818581 | 489 | else if (unlikely(staflags & WLAN_STA_PS_STA)) { |
0c68ae26 | 490 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
47846c9b | 491 | "set -> send frame\n", tx->sdata->name, |
0c68ae26 | 492 | sta->sta.addr); |
e2ebc74d JB |
493 | } |
494 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d | 495 | |
9ae54c84 | 496 | return TX_CONTINUE; |
e2ebc74d JB |
497 | } |
498 | ||
d9e8a70f | 499 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 500 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 501 | { |
5cf121c3 | 502 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 503 | return TX_CONTINUE; |
e2ebc74d | 504 | |
5cf121c3 | 505 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
506 | return ieee80211_tx_h_unicast_ps_buf(tx); |
507 | else | |
508 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
509 | } | |
510 | ||
d9e8a70f | 511 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 512 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 513 | { |
d3feaf5a | 514 | struct ieee80211_key *key = NULL; |
e039fa4a | 515 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 516 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 517 | |
3b8d81e0 | 518 | if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) |
e2ebc74d | 519 | tx->key = NULL; |
d4e46a3d JB |
520 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
521 | tx->key = key; | |
3cfcf6ac | 522 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
ecbcd324 JM |
523 | is_multicast_ether_addr(hdr->addr1) && |
524 | ieee80211_is_robust_mgmt_frame(hdr) && | |
3cfcf6ac JM |
525 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) |
526 | tx->key = key; | |
d4e46a3d JB |
527 | else if ((key = rcu_dereference(tx->sdata->default_key))) |
528 | tx->key = key; | |
e2ebc74d | 529 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 530 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e0463f50 JM |
531 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
532 | (!ieee80211_is_robust_mgmt_frame(hdr) || | |
533 | (ieee80211_is_action(hdr->frame_control) && | |
534 | tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { | |
e2ebc74d | 535 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 536 | return TX_DROP; |
176e4f84 | 537 | } else |
e2ebc74d JB |
538 | tx->key = NULL; |
539 | ||
540 | if (tx->key) { | |
813d7669 JB |
541 | bool skip_hw = false; |
542 | ||
e2ebc74d | 543 | tx->key->tx_rx_count++; |
011bfcc4 | 544 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
545 | |
546 | switch (tx->key->conf.alg) { | |
547 | case ALG_WEP: | |
358c8d9d | 548 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
549 | break; |
550 | case ALG_TKIP: | |
358c8d9d | 551 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
552 | tx->key = NULL; |
553 | break; | |
fb733336 JM |
554 | case ALG_CCMP: |
555 | if (!ieee80211_is_data_present(hdr->frame_control) && | |
556 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
557 | tx->skb)) | |
558 | tx->key = NULL; | |
3b43a187 KV |
559 | else |
560 | skip_hw = (tx->key->conf.flags & | |
561 | IEEE80211_KEY_FLAG_SW_MGMT) && | |
562 | ieee80211_is_mgmt(hdr->frame_control); | |
fb733336 | 563 | break; |
3cfcf6ac JM |
564 | case ALG_AES_CMAC: |
565 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
566 | tx->key = NULL; | |
567 | break; | |
176e4f84 | 568 | } |
813d7669 | 569 | |
f12553eb | 570 | if (!skip_hw && tx->key && |
382b1655 | 571 | tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
813d7669 | 572 | info->control.hw_key = &tx->key->conf; |
e2ebc74d JB |
573 | } |
574 | ||
9ae54c84 | 575 | return TX_CONTINUE; |
e2ebc74d JB |
576 | } |
577 | ||
edc6ccb7 JB |
578 | static ieee80211_tx_result debug_noinline |
579 | ieee80211_tx_h_sta(struct ieee80211_tx_data *tx) | |
580 | { | |
581 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
582 | ||
34e89507 | 583 | if (tx->sta && tx->sta->uploaded) |
edc6ccb7 JB |
584 | info->control.sta = &tx->sta->sta; |
585 | ||
586 | return TX_CONTINUE; | |
587 | } | |
588 | ||
d9e8a70f | 589 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 590 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 591 | { |
e039fa4a | 592 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
593 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
594 | struct ieee80211_supported_band *sband; | |
595 | struct ieee80211_rate *rate; | |
596 | int i, len; | |
597 | bool inval = false, rts = false, short_preamble = false; | |
598 | struct ieee80211_tx_rate_control txrc; | |
b770b43e | 599 | u32 sta_flags; |
8318d78a | 600 | |
e6a9854b | 601 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 602 | |
e6a9854b | 603 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 604 | |
e6a9854b | 605 | len = min_t(int, tx->skb->len + FCS_LEN, |
b9a5f8ca | 606 | tx->local->hw.wiphy->frag_threshold); |
e6a9854b JB |
607 | |
608 | /* set up the tx rate control struct we give the RC algo */ | |
609 | txrc.hw = local_to_hw(tx->local); | |
610 | txrc.sband = sband; | |
611 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
612 | txrc.skb = tx->skb; | |
613 | txrc.reported_rate.idx = -1; | |
37eb0b16 JM |
614 | txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; |
615 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) | |
616 | txrc.max_rate_idx = -1; | |
617 | else | |
618 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
e00cfce0 | 619 | txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP; |
e6a9854b JB |
620 | |
621 | /* set up RTS protection if desired */ | |
b9a5f8ca | 622 | if (len > tx->local->hw.wiphy->rts_threshold) { |
e6a9854b | 623 | txrc.rts = rts = true; |
e2ebc74d | 624 | } |
e2ebc74d | 625 | |
e6a9854b JB |
626 | /* |
627 | * Use short preamble if the BSS can handle it, but not for | |
628 | * management frames unless we know the receiver can handle | |
629 | * that -- the management frame might be to a station that | |
630 | * just wants a probe response. | |
631 | */ | |
632 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
633 | (ieee80211_is_data(hdr->frame_control) || | |
634 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
635 | txrc.short_preamble = short_preamble = true; | |
e2ebc74d | 636 | |
b770b43e LR |
637 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
638 | ||
639 | /* | |
640 | * Lets not bother rate control if we're associated and cannot | |
641 | * talk to the sta. This should not happen. | |
642 | */ | |
fbe9c429 | 643 | if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && |
b770b43e LR |
644 | (sta_flags & WLAN_STA_ASSOC) && |
645 | !rate_usable_index_exists(sband, &tx->sta->sta), | |
646 | "%s: Dropped data frame as no usable bitrate found while " | |
647 | "scanning and associated. Target station: " | |
648 | "%pM on %d GHz band\n", | |
47846c9b | 649 | tx->sdata->name, hdr->addr1, |
b770b43e LR |
650 | tx->channel->band ? 5 : 2)) |
651 | return TX_DROP; | |
2e92e6f2 | 652 | |
b770b43e LR |
653 | /* |
654 | * If we're associated with the sta at this point we know we can at | |
655 | * least send the frame at the lowest bit rate. | |
656 | */ | |
e6a9854b JB |
657 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
658 | ||
659 | if (unlikely(info->control.rates[0].idx < 0)) | |
660 | return TX_DROP; | |
661 | ||
662 | if (txrc.reported_rate.idx < 0) | |
663 | txrc.reported_rate = info->control.rates[0]; | |
e2ebc74d | 664 | |
e039fa4a | 665 | if (tx->sta) |
e6a9854b | 666 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 667 | |
e6a9854b JB |
668 | if (unlikely(!info->control.rates[0].count)) |
669 | info->control.rates[0].count = 1; | |
e2ebc74d | 670 | |
9955151d GS |
671 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && |
672 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) | |
673 | info->control.rates[0].count = 1; | |
674 | ||
e6a9854b JB |
675 | if (is_multicast_ether_addr(hdr->addr1)) { |
676 | /* | |
677 | * XXX: verify the rate is in the basic rateset | |
678 | */ | |
679 | return TX_CONTINUE; | |
e2ebc74d JB |
680 | } |
681 | ||
e6a9854b JB |
682 | /* |
683 | * set up the RTS/CTS rate as the fastest basic rate | |
684 | * that is not faster than the data rate | |
685 | * | |
686 | * XXX: Should this check all retry rates? | |
687 | */ | |
688 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
689 | s8 baserate = 0; | |
690 | ||
691 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
692 | ||
693 | for (i = 0; i < sband->n_bitrates; i++) { | |
694 | /* must be a basic rate */ | |
695 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
696 | continue; | |
697 | /* must not be faster than the data rate */ | |
698 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
699 | continue; | |
700 | /* maximum */ | |
701 | if (sband->bitrates[baserate].bitrate < | |
702 | sband->bitrates[i].bitrate) | |
703 | baserate = i; | |
704 | } | |
705 | ||
706 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
707 | } |
708 | ||
e6a9854b JB |
709 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
710 | /* | |
711 | * make sure there's no valid rate following | |
712 | * an invalid one, just in case drivers don't | |
713 | * take the API seriously to stop at -1. | |
714 | */ | |
715 | if (inval) { | |
716 | info->control.rates[i].idx = -1; | |
717 | continue; | |
718 | } | |
719 | if (info->control.rates[i].idx < 0) { | |
720 | inval = true; | |
721 | continue; | |
722 | } | |
8318d78a | 723 | |
e6a9854b JB |
724 | /* |
725 | * For now assume MCS is already set up correctly, this | |
726 | * needs to be fixed. | |
727 | */ | |
728 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
729 | WARN_ON(info->control.rates[i].idx > 76); | |
730 | continue; | |
731 | } | |
e2ebc74d | 732 | |
e6a9854b JB |
733 | /* set up RTS protection if desired */ |
734 | if (rts) | |
735 | info->control.rates[i].flags |= | |
736 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 737 | |
e6a9854b | 738 | /* RC is busted */ |
075cbc9e S |
739 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
740 | sband->n_bitrates)) { | |
e6a9854b JB |
741 | info->control.rates[i].idx = -1; |
742 | continue; | |
8318d78a | 743 | } |
e2ebc74d | 744 | |
e6a9854b JB |
745 | rate = &sband->bitrates[info->control.rates[i].idx]; |
746 | ||
747 | /* set up short preamble */ | |
748 | if (short_preamble && | |
749 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
750 | info->control.rates[i].flags |= | |
751 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
752 | ||
753 | /* set up G protection */ | |
754 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
755 | rate->flags & IEEE80211_RATE_ERP_G) | |
756 | info->control.rates[i].flags |= | |
757 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
758 | } |
759 | ||
e6a9854b JB |
760 | return TX_CONTINUE; |
761 | } | |
762 | ||
f591fa5d JB |
763 | static ieee80211_tx_result debug_noinline |
764 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
765 | { | |
766 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
767 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
768 | u16 *seq; | |
769 | u8 *qc; | |
770 | int tid; | |
771 | ||
25d834e1 JB |
772 | /* |
773 | * Packet injection may want to control the sequence | |
774 | * number, if we have no matching interface then we | |
775 | * neither assign one ourselves nor ask the driver to. | |
776 | */ | |
5061b0c2 | 777 | if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) |
25d834e1 JB |
778 | return TX_CONTINUE; |
779 | ||
f591fa5d JB |
780 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
781 | return TX_CONTINUE; | |
782 | ||
783 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
784 | return TX_CONTINUE; | |
785 | ||
94778280 JB |
786 | /* |
787 | * Anything but QoS data that has a sequence number field | |
788 | * (is long enough) gets a sequence number from the global | |
789 | * counter. | |
790 | */ | |
f591fa5d | 791 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 792 | /* driver should assign sequence number */ |
f591fa5d | 793 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
794 | /* for pure STA mode without beacons, we can do it */ |
795 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
796 | tx->sdata->sequence_number += 0x10; | |
f591fa5d JB |
797 | return TX_CONTINUE; |
798 | } | |
799 | ||
800 | /* | |
801 | * This should be true for injected/management frames only, for | |
802 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
803 | * above since they are not QoS-data frames. | |
804 | */ | |
805 | if (!tx->sta) | |
806 | return TX_CONTINUE; | |
807 | ||
808 | /* include per-STA, per-TID sequence counter */ | |
809 | ||
810 | qc = ieee80211_get_qos_ctl(hdr); | |
811 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
812 | seq = &tx->sta->tid_seq[tid]; | |
813 | ||
814 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
815 | ||
816 | /* Increase the sequence number. */ | |
817 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
818 | ||
819 | return TX_CONTINUE; | |
820 | } | |
821 | ||
2de8e0d9 JB |
822 | static int ieee80211_fragment(struct ieee80211_local *local, |
823 | struct sk_buff *skb, int hdrlen, | |
824 | int frag_threshold) | |
825 | { | |
826 | struct sk_buff *tail = skb, *tmp; | |
827 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
828 | int pos = hdrlen + per_fragm; | |
829 | int rem = skb->len - hdrlen - per_fragm; | |
830 | ||
831 | if (WARN_ON(rem < 0)) | |
832 | return -EINVAL; | |
833 | ||
834 | while (rem) { | |
835 | int fraglen = per_fragm; | |
836 | ||
837 | if (fraglen > rem) | |
838 | fraglen = rem; | |
839 | rem -= fraglen; | |
840 | tmp = dev_alloc_skb(local->tx_headroom + | |
841 | frag_threshold + | |
842 | IEEE80211_ENCRYPT_HEADROOM + | |
843 | IEEE80211_ENCRYPT_TAILROOM); | |
844 | if (!tmp) | |
845 | return -ENOMEM; | |
846 | tail->next = tmp; | |
847 | tail = tmp; | |
848 | skb_reserve(tmp, local->tx_headroom + | |
849 | IEEE80211_ENCRYPT_HEADROOM); | |
850 | /* copy control information */ | |
851 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); | |
852 | skb_copy_queue_mapping(tmp, skb); | |
853 | tmp->priority = skb->priority; | |
2de8e0d9 | 854 | tmp->dev = skb->dev; |
2de8e0d9 JB |
855 | |
856 | /* copy header and data */ | |
857 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); | |
858 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); | |
859 | ||
860 | pos += fraglen; | |
861 | } | |
862 | ||
863 | skb->len = hdrlen + per_fragm; | |
864 | return 0; | |
865 | } | |
866 | ||
d9e8a70f | 867 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
868 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
869 | { | |
2de8e0d9 JB |
870 | struct sk_buff *skb = tx->skb; |
871 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
872 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
b9a5f8ca | 873 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; |
2de8e0d9 JB |
874 | int hdrlen; |
875 | int fragnum; | |
e2454948 JB |
876 | |
877 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
878 | return TX_CONTINUE; | |
879 | ||
eefce91a JB |
880 | /* |
881 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
3b8d81e0 | 882 | * This scenario is handled in ieee80211_tx_prepare but extra |
8d5e0d58 | 883 | * caution taken here as fragmented ampdu may cause Tx stop. |
eefce91a | 884 | */ |
8b30b1fe | 885 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
886 | return TX_DROP; |
887 | ||
065e9605 | 888 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 | 889 | |
2de8e0d9 | 890 | /* internal error, why is TX_FRAGMENTED set? */ |
8ccd8f21 | 891 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) |
2de8e0d9 | 892 | return TX_DROP; |
e6a9854b | 893 | |
2de8e0d9 JB |
894 | /* |
895 | * Now fragment the frame. This will allocate all the fragments and | |
896 | * chain them (using skb as the first fragment) to skb->next. | |
897 | * During transmission, we will remove the successfully transmitted | |
898 | * fragments from this list. When the low-level driver rejects one | |
899 | * of the fragments then we will simply pretend to accept the skb | |
900 | * but store it away as pending. | |
901 | */ | |
902 | if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) | |
903 | return TX_DROP; | |
e6a9854b | 904 | |
2de8e0d9 JB |
905 | /* update duration/seq/flags of fragments */ |
906 | fragnum = 0; | |
907 | do { | |
908 | int next_len; | |
909 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
e6a9854b | 910 | |
2de8e0d9 JB |
911 | hdr = (void *)skb->data; |
912 | info = IEEE80211_SKB_CB(skb); | |
e6a9854b | 913 | |
2de8e0d9 JB |
914 | if (skb->next) { |
915 | hdr->frame_control |= morefrags; | |
916 | next_len = skb->next->len; | |
e6a9854b JB |
917 | /* |
918 | * No multi-rate retries for fragmented frames, that | |
919 | * would completely throw off the NAV at other STAs. | |
920 | */ | |
921 | info->control.rates[1].idx = -1; | |
922 | info->control.rates[2].idx = -1; | |
923 | info->control.rates[3].idx = -1; | |
924 | info->control.rates[4].idx = -1; | |
925 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
926 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
2de8e0d9 JB |
927 | } else { |
928 | hdr->frame_control &= ~morefrags; | |
929 | next_len = 0; | |
e6a9854b | 930 | } |
2de8e0d9 JB |
931 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); |
932 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); | |
933 | fragnum++; | |
934 | } while ((skb = skb->next)); | |
e2ebc74d | 935 | |
9ae54c84 | 936 | return TX_CONTINUE; |
e2ebc74d JB |
937 | } |
938 | ||
feff1f2f JB |
939 | static ieee80211_tx_result debug_noinline |
940 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) | |
941 | { | |
942 | struct sk_buff *skb = tx->skb; | |
943 | ||
944 | if (!tx->sta) | |
945 | return TX_CONTINUE; | |
946 | ||
947 | tx->sta->tx_packets++; | |
948 | do { | |
949 | tx->sta->tx_fragments++; | |
950 | tx->sta->tx_bytes += skb->len; | |
951 | } while ((skb = skb->next)); | |
952 | ||
953 | return TX_CONTINUE; | |
954 | } | |
955 | ||
d9e8a70f | 956 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
957 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
958 | { | |
959 | if (!tx->key) | |
960 | return TX_CONTINUE; | |
961 | ||
962 | switch (tx->key->conf.alg) { | |
963 | case ALG_WEP: | |
964 | return ieee80211_crypto_wep_encrypt(tx); | |
965 | case ALG_TKIP: | |
966 | return ieee80211_crypto_tkip_encrypt(tx); | |
967 | case ALG_CCMP: | |
968 | return ieee80211_crypto_ccmp_encrypt(tx); | |
3cfcf6ac JM |
969 | case ALG_AES_CMAC: |
970 | return ieee80211_crypto_aes_cmac_encrypt(tx); | |
e2454948 JB |
971 | } |
972 | ||
973 | /* not reached */ | |
974 | WARN_ON(1); | |
975 | return TX_DROP; | |
976 | } | |
977 | ||
d9e8a70f | 978 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
979 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
980 | { | |
2de8e0d9 JB |
981 | struct sk_buff *skb = tx->skb; |
982 | struct ieee80211_hdr *hdr; | |
983 | int next_len; | |
984 | bool group_addr; | |
03f93c3d | 985 | |
2de8e0d9 JB |
986 | do { |
987 | hdr = (void *) skb->data; | |
7e0aae47 JM |
988 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) |
989 | break; /* must not overwrite AID */ | |
2de8e0d9 JB |
990 | next_len = skb->next ? skb->next->len : 0; |
991 | group_addr = is_multicast_ether_addr(hdr->addr1); | |
03f93c3d | 992 | |
2de8e0d9 JB |
993 | hdr->duration_id = |
994 | ieee80211_duration(tx, group_addr, next_len); | |
995 | } while ((skb = skb->next)); | |
03f93c3d JB |
996 | |
997 | return TX_CONTINUE; | |
998 | } | |
999 | ||
e2ebc74d JB |
1000 | /* actual transmit path */ |
1001 | ||
1002 | /* | |
1003 | * deal with packet injection down monitor interface | |
1004 | * with Radiotap Header -- only called for monitor mode interface | |
1005 | */ | |
27004b10 JB |
1006 | static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
1007 | struct sk_buff *skb) | |
e2ebc74d JB |
1008 | { |
1009 | /* | |
1010 | * this is the moment to interpret and discard the radiotap header that | |
1011 | * must be at the start of the packet injected in Monitor mode | |
1012 | * | |
1013 | * Need to take some care with endian-ness since radiotap | |
1014 | * args are little-endian | |
1015 | */ | |
1016 | ||
1017 | struct ieee80211_radiotap_iterator iterator; | |
1018 | struct ieee80211_radiotap_header *rthdr = | |
1019 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 1020 | struct ieee80211_supported_band *sband; |
3b8d81e0 | 1021 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
33e5a2f7 JB |
1022 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, |
1023 | NULL); | |
e2ebc74d | 1024 | |
2e92e6f2 | 1025 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 1026 | |
3b8d81e0 | 1027 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
5cf121c3 | 1028 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1029 | |
1030 | /* | |
1031 | * for every radiotap entry that is present | |
1032 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
1033 | * entries present, or -EINVAL on error) | |
1034 | */ | |
1035 | ||
1036 | while (!ret) { | |
e2ebc74d JB |
1037 | ret = ieee80211_radiotap_iterator_next(&iterator); |
1038 | ||
1039 | if (ret) | |
1040 | continue; | |
1041 | ||
1042 | /* see if this argument is something we can use */ | |
1043 | switch (iterator.this_arg_index) { | |
1044 | /* | |
1045 | * You must take care when dereferencing iterator.this_arg | |
1046 | * for multibyte types... the pointer is not aligned. Use | |
1047 | * get_unaligned((type *)iterator.this_arg) to dereference | |
1048 | * iterator.this_arg for type "type" safely on all arches. | |
1049 | */ | |
e2ebc74d JB |
1050 | case IEEE80211_RADIOTAP_FLAGS: |
1051 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
1052 | /* | |
1053 | * this indicates that the skb we have been | |
1054 | * handed has the 32-bit FCS CRC at the end... | |
1055 | * we should react to that by snipping it off | |
1056 | * because it will be recomputed and added | |
1057 | * on transmission | |
1058 | */ | |
33e5a2f7 | 1059 | if (skb->len < (iterator._max_length + FCS_LEN)) |
27004b10 | 1060 | return false; |
e2ebc74d JB |
1061 | |
1062 | skb_trim(skb, skb->len - FCS_LEN); | |
1063 | } | |
58d4185e | 1064 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
3b8d81e0 | 1065 | info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; |
58d4185e | 1066 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 1067 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1068 | break; |
1069 | ||
58d4185e JB |
1070 | /* |
1071 | * Please update the file | |
1072 | * Documentation/networking/mac80211-injection.txt | |
1073 | * when parsing new fields here. | |
1074 | */ | |
1075 | ||
e2ebc74d JB |
1076 | default: |
1077 | break; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
27004b10 | 1082 | return false; |
e2ebc74d JB |
1083 | |
1084 | /* | |
1085 | * remove the radiotap header | |
33e5a2f7 | 1086 | * iterator->_max_length was sanity-checked against |
e2ebc74d JB |
1087 | * skb->len by iterator init |
1088 | */ | |
33e5a2f7 | 1089 | skb_pull(skb, iterator._max_length); |
e2ebc74d | 1090 | |
27004b10 | 1091 | return true; |
e2ebc74d JB |
1092 | } |
1093 | ||
58d4185e JB |
1094 | /* |
1095 | * initialises @tx | |
1096 | */ | |
9ae54c84 | 1097 | static ieee80211_tx_result |
3b8d81e0 JB |
1098 | ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, |
1099 | struct ieee80211_tx_data *tx, | |
1100 | struct sk_buff *skb) | |
e2ebc74d | 1101 | { |
3b8d81e0 | 1102 | struct ieee80211_local *local = sdata->local; |
58d4185e | 1103 | struct ieee80211_hdr *hdr; |
e039fa4a | 1104 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8b30b1fe S |
1105 | int hdrlen, tid; |
1106 | u8 *qc, *state; | |
cd8ffc80 | 1107 | bool queued = false; |
e2ebc74d JB |
1108 | |
1109 | memset(tx, 0, sizeof(*tx)); | |
1110 | tx->skb = skb; | |
e2ebc74d | 1111 | tx->local = local; |
3b8d81e0 | 1112 | tx->sdata = sdata; |
e039fa4a | 1113 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 1114 | /* |
58d4185e JB |
1115 | * Set this flag (used below to indicate "automatic fragmentation"), |
1116 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 1117 | */ |
5cf121c3 | 1118 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1119 | |
1120 | /* process and remove the injection radiotap header */ | |
17ad353b | 1121 | if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) { |
27004b10 | 1122 | if (!__ieee80211_parse_tx_radiotap(tx, skb)) |
9ae54c84 | 1123 | return TX_DROP; |
58d4185e | 1124 | |
e2ebc74d | 1125 | /* |
58d4185e JB |
1126 | * __ieee80211_parse_tx_radiotap has now removed |
1127 | * the radiotap header that was present and pre-filled | |
1128 | * 'tx' with tx control information. | |
e2ebc74d | 1129 | */ |
17ad353b | 1130 | info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP; |
e2ebc74d JB |
1131 | } |
1132 | ||
cd8ffc80 JB |
1133 | /* |
1134 | * If this flag is set to true anywhere, and we get here, | |
1135 | * we are doing the needed processing, so remove the flag | |
1136 | * now. | |
1137 | */ | |
1138 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1139 | ||
58d4185e JB |
1140 | hdr = (struct ieee80211_hdr *) skb->data; |
1141 | ||
3f0e0b22 | 1142 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
f14543ee | 1143 | tx->sta = rcu_dereference(sdata->u.vlan.sta); |
3f0e0b22 FF |
1144 | if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) |
1145 | return TX_DROP; | |
b4d57adb FF |
1146 | } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { |
1147 | tx->sta = sta_info_get_bss(sdata, hdr->addr1); | |
3f0e0b22 | 1148 | } |
f14543ee | 1149 | if (!tx->sta) |
abe60632 | 1150 | tx->sta = sta_info_get(sdata, hdr->addr1); |
58d4185e | 1151 | |
cd8ffc80 JB |
1152 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
1153 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { | |
cd8ffc80 JB |
1154 | struct tid_ampdu_tx *tid_tx; |
1155 | ||
8b30b1fe S |
1156 | qc = ieee80211_get_qos_ctl(hdr); |
1157 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1158 | ||
2b43ae6d | 1159 | spin_lock(&tx->sta->lock); |
cd8ffc80 JB |
1160 | /* |
1161 | * XXX: This spinlock could be fairly expensive, but see the | |
1162 | * comment in agg-tx.c:ieee80211_agg_tx_operational(). | |
1163 | * One way to solve this would be to do something RCU-like | |
1164 | * for managing the tid_tx struct and using atomic bitops | |
1165 | * for the actual state -- by introducing an actual | |
1166 | * 'operational' bit that would be possible. It would | |
1167 | * require changing ieee80211_agg_tx_operational() to | |
1168 | * set that bit, and changing the way tid_tx is managed | |
1169 | * everywhere, including races between that bit and | |
1170 | * tid_tx going away (tid_tx being added can be easily | |
1171 | * committed to memory before the 'operational' bit). | |
1172 | */ | |
1173 | tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; | |
8b30b1fe | 1174 | state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; |
cd8ffc80 | 1175 | if (*state == HT_AGG_STATE_OPERATIONAL) { |
8b30b1fe | 1176 | info->flags |= IEEE80211_TX_CTL_AMPDU; |
cd8ffc80 JB |
1177 | } else if (*state != HT_AGG_STATE_IDLE) { |
1178 | /* in progress */ | |
1179 | queued = true; | |
5061b0c2 | 1180 | info->control.vif = &sdata->vif; |
cd8ffc80 JB |
1181 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
1182 | __skb_queue_tail(&tid_tx->pending, skb); | |
1183 | } | |
2b43ae6d | 1184 | spin_unlock(&tx->sta->lock); |
cd8ffc80 JB |
1185 | |
1186 | if (unlikely(queued)) | |
1187 | return TX_QUEUED; | |
8b30b1fe S |
1188 | } |
1189 | ||
badffb72 | 1190 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1191 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1192 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1193 | } else { |
5cf121c3 | 1194 | tx->flags |= IEEE80211_TX_UNICAST; |
d3707d99 JB |
1195 | if (unlikely(local->wifi_wme_noack_test)) |
1196 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1197 | else | |
1198 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; | |
badffb72 | 1199 | } |
58d4185e | 1200 | |
5cf121c3 JB |
1201 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1202 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
b9a5f8ca | 1203 | skb->len + FCS_LEN > local->hw.wiphy->frag_threshold && |
8d5e0d58 | 1204 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
5cf121c3 | 1205 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1206 | else |
5cf121c3 | 1207 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1208 | } |
1209 | ||
e2ebc74d | 1210 | if (!tx->sta) |
e039fa4a | 1211 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1212 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1213 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1214 | |
b73d70ad | 1215 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1216 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1217 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1218 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1219 | } | |
e039fa4a | 1220 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1221 | |
9ae54c84 | 1222 | return TX_CONTINUE; |
e2ebc74d JB |
1223 | } |
1224 | ||
2de8e0d9 | 1225 | static int __ieee80211_tx(struct ieee80211_local *local, |
1870cd71 | 1226 | struct sk_buff **skbp, |
3b8d81e0 JB |
1227 | struct sta_info *sta, |
1228 | bool txpending) | |
e2ebc74d | 1229 | { |
1870cd71 | 1230 | struct sk_buff *skb = *skbp, *next; |
f8e79ddd | 1231 | struct ieee80211_tx_info *info; |
5061b0c2 | 1232 | struct ieee80211_sub_if_data *sdata; |
3b8d81e0 | 1233 | unsigned long flags; |
a220858d | 1234 | int ret, len; |
2de8e0d9 | 1235 | bool fragm = false; |
e2ebc74d | 1236 | |
2de8e0d9 | 1237 | while (skb) { |
3b8d81e0 JB |
1238 | int q = skb_get_queue_mapping(skb); |
1239 | ||
1240 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
1241 | ret = IEEE80211_TX_OK; | |
1242 | if (local->queue_stop_reasons[q] || | |
1243 | (!txpending && !skb_queue_empty(&local->pending[q]))) | |
1244 | ret = IEEE80211_TX_PENDING; | |
1245 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
1246 | if (ret != IEEE80211_TX_OK) | |
1247 | return ret; | |
f8e79ddd | 1248 | |
f0e72851 JB |
1249 | info = IEEE80211_SKB_CB(skb); |
1250 | ||
1251 | if (fragm) | |
e6a9854b | 1252 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1253 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
f0e72851 | 1254 | |
2de8e0d9 | 1255 | next = skb->next; |
a220858d | 1256 | len = skb->len; |
5061b0c2 | 1257 | |
ad5351db JB |
1258 | if (next) |
1259 | info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; | |
1260 | ||
5061b0c2 JB |
1261 | sdata = vif_to_sdata(info->control.vif); |
1262 | ||
1263 | switch (sdata->vif.type) { | |
1264 | case NL80211_IFTYPE_MONITOR: | |
1265 | info->control.vif = NULL; | |
1266 | break; | |
1267 | case NL80211_IFTYPE_AP_VLAN: | |
1268 | info->control.vif = &container_of(sdata->bss, | |
1269 | struct ieee80211_sub_if_data, u.ap)->vif; | |
1270 | break; | |
1271 | default: | |
1272 | /* keep */ | |
1273 | break; | |
1274 | } | |
1275 | ||
24487981 | 1276 | ret = drv_tx(local, skb); |
a220858d JB |
1277 | if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { |
1278 | dev_kfree_skb(skb); | |
1279 | ret = NETDEV_TX_OK; | |
1280 | } | |
21f5fc75 LR |
1281 | if (ret != NETDEV_TX_OK) { |
1282 | info->control.vif = &sdata->vif; | |
2de8e0d9 | 1283 | return IEEE80211_TX_AGAIN; |
21f5fc75 LR |
1284 | } |
1285 | ||
1870cd71 | 1286 | *skbp = skb = next; |
2de8e0d9 JB |
1287 | ieee80211_led_tx(local, 1); |
1288 | fragm = true; | |
e2ebc74d | 1289 | } |
2de8e0d9 | 1290 | |
e2ebc74d JB |
1291 | return IEEE80211_TX_OK; |
1292 | } | |
1293 | ||
97b045d6 JB |
1294 | /* |
1295 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1296 | * frame was dropped or queued. | |
1297 | */ | |
1298 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1299 | { | |
97b045d6 | 1300 | struct sk_buff *skb = tx->skb; |
c6fcf6bc | 1301 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
97b045d6 | 1302 | ieee80211_tx_result res = TX_DROP; |
97b045d6 | 1303 | |
9aa4aee3 JB |
1304 | #define CALL_TXH(txh) \ |
1305 | do { \ | |
1306 | res = txh(tx); \ | |
1307 | if (res != TX_CONTINUE) \ | |
1308 | goto txh_done; \ | |
1309 | } while (0) | |
1310 | ||
5c1b98a5 | 1311 | CALL_TXH(ieee80211_tx_h_dynamic_ps); |
9aa4aee3 JB |
1312 | CALL_TXH(ieee80211_tx_h_check_assoc); |
1313 | CALL_TXH(ieee80211_tx_h_ps_buf); | |
1314 | CALL_TXH(ieee80211_tx_h_select_key); | |
edc6ccb7 | 1315 | CALL_TXH(ieee80211_tx_h_sta); |
af65cd96 JB |
1316 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) |
1317 | CALL_TXH(ieee80211_tx_h_rate_ctrl); | |
c6fcf6bc JB |
1318 | |
1319 | if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) | |
1320 | goto txh_done; | |
1321 | ||
1322 | CALL_TXH(ieee80211_tx_h_michael_mic_add); | |
9aa4aee3 JB |
1323 | CALL_TXH(ieee80211_tx_h_sequence); |
1324 | CALL_TXH(ieee80211_tx_h_fragment); | |
d9e8a70f | 1325 | /* handlers after fragment must be aware of tx info fragmentation! */ |
9aa4aee3 JB |
1326 | CALL_TXH(ieee80211_tx_h_stats); |
1327 | CALL_TXH(ieee80211_tx_h_encrypt); | |
1328 | CALL_TXH(ieee80211_tx_h_calculate_duration); | |
d9e8a70f | 1329 | #undef CALL_TXH |
97b045d6 | 1330 | |
d9e8a70f | 1331 | txh_done: |
97b045d6 | 1332 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1333 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
2de8e0d9 JB |
1334 | while (skb) { |
1335 | struct sk_buff *next; | |
1336 | ||
1337 | next = skb->next; | |
1338 | dev_kfree_skb(skb); | |
1339 | skb = next; | |
1340 | } | |
97b045d6 JB |
1341 | return -1; |
1342 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1343 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1344 | return -1; |
1345 | } | |
1346 | ||
1347 | return 0; | |
1348 | } | |
1349 | ||
3b8d81e0 JB |
1350 | static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, |
1351 | struct sk_buff *skb, bool txpending) | |
e2ebc74d | 1352 | { |
3b8d81e0 | 1353 | struct ieee80211_local *local = sdata->local; |
5cf121c3 | 1354 | struct ieee80211_tx_data tx; |
97b045d6 | 1355 | ieee80211_tx_result res_prepare; |
e039fa4a | 1356 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2a577d98 JB |
1357 | struct sk_buff *next; |
1358 | unsigned long flags; | |
1359 | int ret, retries; | |
e2530083 | 1360 | u16 queue; |
e2ebc74d | 1361 | |
e2530083 JB |
1362 | queue = skb_get_queue_mapping(skb); |
1363 | ||
e2ebc74d JB |
1364 | if (unlikely(skb->len < 10)) { |
1365 | dev_kfree_skb(skb); | |
cd8ffc80 | 1366 | return; |
e2ebc74d JB |
1367 | } |
1368 | ||
d0709a65 JB |
1369 | rcu_read_lock(); |
1370 | ||
58d4185e | 1371 | /* initialises tx */ |
3b8d81e0 | 1372 | res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); |
e2ebc74d | 1373 | |
cd8ffc80 | 1374 | if (unlikely(res_prepare == TX_DROP)) { |
e2ebc74d | 1375 | dev_kfree_skb(skb); |
d0709a65 | 1376 | rcu_read_unlock(); |
cd8ffc80 JB |
1377 | return; |
1378 | } else if (unlikely(res_prepare == TX_QUEUED)) { | |
1379 | rcu_read_unlock(); | |
1380 | return; | |
e2ebc74d JB |
1381 | } |
1382 | ||
5cf121c3 | 1383 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1384 | info->band = tx.channel->band; |
e2ebc74d | 1385 | |
97b045d6 JB |
1386 | if (invoke_tx_handlers(&tx)) |
1387 | goto out; | |
e2ebc74d | 1388 | |
2a577d98 JB |
1389 | retries = 0; |
1390 | retry: | |
3b8d81e0 | 1391 | ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); |
2a577d98 JB |
1392 | switch (ret) { |
1393 | case IEEE80211_TX_OK: | |
1394 | break; | |
1395 | case IEEE80211_TX_AGAIN: | |
eefce91a JB |
1396 | /* |
1397 | * Since there are no fragmented frames on A-MPDU | |
1398 | * queues, there's no reason for a driver to reject | |
1399 | * a frame there, warn and drop it. | |
1400 | */ | |
2a577d98 JB |
1401 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
1402 | goto drop; | |
1403 | /* fall through */ | |
1404 | case IEEE80211_TX_PENDING: | |
1405 | skb = tx.skb; | |
eefce91a | 1406 | |
2a577d98 | 1407 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
e2ebc74d | 1408 | |
3b8d81e0 JB |
1409 | if (local->queue_stop_reasons[queue] || |
1410 | !skb_queue_empty(&local->pending[queue])) { | |
1411 | /* | |
1412 | * if queue is stopped, queue up frames for later | |
1413 | * transmission from the tasklet | |
1414 | */ | |
2a577d98 JB |
1415 | do { |
1416 | next = skb->next; | |
1417 | skb->next = NULL; | |
cd8ffc80 | 1418 | if (unlikely(txpending)) |
3b8d81e0 JB |
1419 | __skb_queue_head(&local->pending[queue], |
1420 | skb); | |
cd8ffc80 | 1421 | else |
3b8d81e0 JB |
1422 | __skb_queue_tail(&local->pending[queue], |
1423 | skb); | |
2a577d98 JB |
1424 | } while ((skb = next)); |
1425 | ||
2a577d98 JB |
1426 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1427 | flags); | |
1428 | } else { | |
3b8d81e0 JB |
1429 | /* |
1430 | * otherwise retry, but this is a race condition or | |
1431 | * a driver bug (which we warn about if it persists) | |
1432 | */ | |
2a577d98 JB |
1433 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1434 | flags); | |
1435 | ||
1436 | retries++; | |
3b8d81e0 | 1437 | if (WARN(retries > 10, "tx refused but queue active\n")) |
2a577d98 | 1438 | goto drop; |
e2ebc74d JB |
1439 | goto retry; |
1440 | } | |
e2ebc74d | 1441 | } |
97b045d6 | 1442 | out: |
d4e46a3d | 1443 | rcu_read_unlock(); |
cd8ffc80 | 1444 | return; |
e2ebc74d JB |
1445 | |
1446 | drop: | |
d4e46a3d | 1447 | rcu_read_unlock(); |
2de8e0d9 JB |
1448 | |
1449 | skb = tx.skb; | |
1450 | while (skb) { | |
2de8e0d9 JB |
1451 | next = skb->next; |
1452 | dev_kfree_skb(skb); | |
1453 | skb = next; | |
1454 | } | |
e2ebc74d JB |
1455 | } |
1456 | ||
1457 | /* device xmit handlers */ | |
1458 | ||
23c0752a JB |
1459 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1460 | struct sk_buff *skb, | |
1461 | int head_need, bool may_encrypt) | |
1462 | { | |
1463 | int tail_need = 0; | |
1464 | ||
1465 | /* | |
1466 | * This could be optimised, devices that do full hardware | |
1467 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1468 | * have no drivers for such devices currently. | |
1469 | */ | |
1470 | if (may_encrypt) { | |
1471 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1472 | tail_need -= skb_tailroom(skb); | |
1473 | tail_need = max_t(int, tail_need, 0); | |
1474 | } | |
1475 | ||
1476 | if (head_need || tail_need) { | |
1477 | /* Sorry. Can't account for this any more */ | |
1478 | skb_orphan(skb); | |
1479 | } | |
1480 | ||
1481 | if (skb_header_cloned(skb)) | |
1482 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1483 | else | |
1484 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1485 | ||
1486 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1487 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1488 | wiphy_name(local->hw.wiphy)); | |
1489 | return -ENOMEM; | |
1490 | } | |
1491 | ||
1492 | /* update truesize too */ | |
1493 | skb->truesize += head_need + tail_need; | |
1494 | ||
1495 | return 0; | |
1496 | } | |
1497 | ||
3b8d81e0 JB |
1498 | static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, |
1499 | struct sk_buff *skb) | |
e2ebc74d | 1500 | { |
3b8d81e0 | 1501 | struct ieee80211_local *local = sdata->local; |
e039fa4a | 1502 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1503 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
3b8d81e0 | 1504 | struct ieee80211_sub_if_data *tmp_sdata; |
e2ebc74d | 1505 | int headroom; |
23c0752a | 1506 | bool may_encrypt; |
e2ebc74d | 1507 | |
d84f3234 JB |
1508 | rcu_read_lock(); |
1509 | ||
cca89496 | 1510 | if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
25d834e1 JB |
1511 | int hdrlen; |
1512 | u16 len_rthdr; | |
1513 | ||
17ad353b FF |
1514 | info->flags |= IEEE80211_TX_CTL_INJECTED | |
1515 | IEEE80211_TX_INTFL_HAS_RADIOTAP; | |
25d834e1 JB |
1516 | |
1517 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
8ef86c7b | 1518 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); |
25d834e1 JB |
1519 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
1520 | ||
1521 | /* check the header is complete in the frame */ | |
1522 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1523 | /* | |
1524 | * We process outgoing injected frames that have a | |
1525 | * local address we handle as though they are our | |
1526 | * own frames. | |
1527 | * This code here isn't entirely correct, the local | |
1528 | * MAC address is not necessarily enough to find | |
1529 | * the interface to use; for that proper VLAN/WDS | |
1530 | * support we will need a different mechanism. | |
1531 | */ | |
1532 | ||
3b8d81e0 | 1533 | list_for_each_entry_rcu(tmp_sdata, &local->interfaces, |
25d834e1 | 1534 | list) { |
9607e6b6 | 1535 | if (!ieee80211_sdata_running(tmp_sdata)) |
25d834e1 | 1536 | continue; |
3b8d81e0 | 1537 | if (tmp_sdata->vif.type != NL80211_IFTYPE_AP) |
f1b33cb1 | 1538 | continue; |
47846c9b | 1539 | if (compare_ether_addr(tmp_sdata->vif.addr, |
9b1ce526 | 1540 | hdr->addr2) == 0) { |
3b8d81e0 | 1541 | sdata = tmp_sdata; |
25d834e1 JB |
1542 | break; |
1543 | } | |
1544 | } | |
25d834e1 | 1545 | } |
e32f85f7 LCC |
1546 | } |
1547 | ||
3b8d81e0 | 1548 | may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); |
23c0752a | 1549 | |
3b8d81e0 | 1550 | headroom = local->tx_headroom; |
23c0752a JB |
1551 | if (may_encrypt) |
1552 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1553 | headroom -= skb_headroom(skb); | |
1554 | headroom = max_t(int, 0, headroom); | |
1555 | ||
3b8d81e0 | 1556 | if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) { |
23c0752a | 1557 | dev_kfree_skb(skb); |
d84f3234 | 1558 | rcu_read_unlock(); |
3b8d81e0 | 1559 | return; |
e2ebc74d JB |
1560 | } |
1561 | ||
5061b0c2 | 1562 | info->control.vif = &sdata->vif; |
e2ebc74d | 1563 | |
cca89496 JC |
1564 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
1565 | ieee80211_is_data(hdr->frame_control) && | |
1566 | !is_multicast_ether_addr(hdr->addr1)) | |
1567 | if (mesh_nexthop_lookup(skb, sdata)) { | |
1568 | /* skb queued: don't free */ | |
d84f3234 | 1569 | rcu_read_unlock(); |
cca89496 JC |
1570 | return; |
1571 | } | |
1572 | ||
cf0277e7 | 1573 | ieee80211_set_qos_hdr(local, skb); |
3b8d81e0 | 1574 | ieee80211_tx(sdata, skb, false); |
d84f3234 | 1575 | rcu_read_unlock(); |
e2ebc74d JB |
1576 | } |
1577 | ||
d0cf9c0d SH |
1578 | netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, |
1579 | struct net_device *dev) | |
e2ebc74d JB |
1580 | { |
1581 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
47f4d887 | 1582 | struct ieee80211_channel *chan = local->hw.conf.channel; |
e2ebc74d JB |
1583 | struct ieee80211_radiotap_header *prthdr = |
1584 | (struct ieee80211_radiotap_header *)skb->data; | |
3b8d81e0 | 1585 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
9b8a74e3 | 1586 | u16 len_rthdr; |
e2ebc74d | 1587 | |
47f4d887 LR |
1588 | /* |
1589 | * Frame injection is not allowed if beaconing is not allowed | |
1590 | * or if we need radar detection. Beaconing is usually not allowed when | |
1591 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1592 | * Passive scan is also used in world regulatory domains where | |
1593 | * your country is not known and as such it should be treated as | |
1594 | * NO TX unless the channel is explicitly allowed in which case | |
1595 | * your current regulatory domain would not have the passive scan | |
1596 | * flag. | |
1597 | * | |
1598 | * Since AP mode uses monitor interfaces to inject/TX management | |
1599 | * frames we can make AP mode the exception to this rule once it | |
1600 | * supports radar detection as its implementation can deal with | |
1601 | * radar detection by itself. We can do that later by adding a | |
1602 | * monitor flag interfaces used for AP support. | |
1603 | */ | |
1604 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | | |
1605 | IEEE80211_CHAN_PASSIVE_SCAN))) | |
1606 | goto fail; | |
1607 | ||
9b8a74e3 AG |
1608 | /* check for not even having the fixed radiotap header part */ |
1609 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1610 | goto fail; /* too short to be possibly valid */ | |
1611 | ||
1612 | /* is it a header version we can trust to find length from? */ | |
1613 | if (unlikely(prthdr->it_version)) | |
1614 | goto fail; /* only version 0 is supported */ | |
1615 | ||
1616 | /* then there must be a radiotap header with a length we can use */ | |
1617 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1618 | ||
1619 | /* does the skb contain enough to deliver on the alleged length? */ | |
1620 | if (unlikely(skb->len < len_rthdr)) | |
1621 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d | 1622 | |
e2ebc74d JB |
1623 | /* |
1624 | * fix up the pointers accounting for the radiotap | |
1625 | * header still being in there. We are being given | |
1626 | * a precooked IEEE80211 header so no need for | |
1627 | * normal processing | |
1628 | */ | |
9b8a74e3 | 1629 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1630 | /* |
9b8a74e3 AG |
1631 | * these are just fixed to the end of the rt area since we |
1632 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1633 | */ |
9b8a74e3 AG |
1634 | skb_set_network_header(skb, len_rthdr); |
1635 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1636 | |
3b8d81e0 JB |
1637 | memset(info, 0, sizeof(*info)); |
1638 | ||
7351c6bd JB |
1639 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
1640 | ||
3b8d81e0 JB |
1641 | /* pass the radiotap header up to xmit */ |
1642 | ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb); | |
e2ebc74d | 1643 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1644 | |
1645 | fail: | |
1646 | dev_kfree_skb(skb); | |
1647 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1648 | } |
1649 | ||
1650 | /** | |
1651 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1652 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1653 | * @skb: packet to be sent | |
1654 | * @dev: incoming interface | |
1655 | * | |
1656 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1657 | * not be freed, and caller is responsible for either retrying later or freeing | |
1658 | * skb). | |
1659 | * | |
1660 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1661 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1662 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1663 | * transmission (through low-level driver). | |
1664 | */ | |
d0cf9c0d SH |
1665 | netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, |
1666 | struct net_device *dev) | |
e2ebc74d | 1667 | { |
133b8226 JB |
1668 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1669 | struct ieee80211_local *local = sdata->local; | |
3b8d81e0 | 1670 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
5b548140 | 1671 | int ret = NETDEV_TX_BUSY, head_need; |
065e9605 HH |
1672 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1673 | __le16 fc; | |
e2ebc74d | 1674 | struct ieee80211_hdr hdr; |
33b64eb2 | 1675 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1676 | const u8 *encaps_data; |
1677 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1678 | int nh_pos, h_pos; |
f14543ee | 1679 | struct sta_info *sta = NULL; |
ce3edf6d | 1680 | u32 sta_flags = 0; |
e2ebc74d | 1681 | |
e2ebc74d | 1682 | if (unlikely(skb->len < ETH_HLEN)) { |
ec634fe3 | 1683 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1684 | goto fail; |
1685 | } | |
1686 | ||
1687 | nh_pos = skb_network_header(skb) - skb->data; | |
1688 | h_pos = skb_transport_header(skb) - skb->data; | |
1689 | ||
1690 | /* convert Ethernet header to proper 802.11 header (based on | |
1691 | * operation mode) */ | |
1692 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1693 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1694 | |
51fb61e7 | 1695 | switch (sdata->vif.type) { |
05c914fe | 1696 | case NL80211_IFTYPE_AP_VLAN: |
f14543ee | 1697 | rcu_read_lock(); |
9bc383de | 1698 | sta = rcu_dereference(sdata->u.vlan.sta); |
f14543ee FF |
1699 | if (sta) { |
1700 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); | |
1701 | /* RA TA DA SA */ | |
1702 | memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); | |
47846c9b | 1703 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
f14543ee FF |
1704 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1705 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1706 | hdrlen = 30; | |
1707 | sta_flags = get_sta_flags(sta); | |
1708 | } | |
1709 | rcu_read_unlock(); | |
1710 | if (sta) | |
1711 | break; | |
1712 | /* fall through */ | |
1713 | case NL80211_IFTYPE_AP: | |
065e9605 | 1714 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1715 | /* DA BSSID SA */ |
1716 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
47846c9b | 1717 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
e2ebc74d JB |
1718 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); |
1719 | hdrlen = 24; | |
cf966838 | 1720 | break; |
05c914fe | 1721 | case NL80211_IFTYPE_WDS: |
065e9605 | 1722 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1723 | /* RA TA DA SA */ |
1724 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
47846c9b | 1725 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
e2ebc74d JB |
1726 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1727 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1728 | hdrlen = 30; | |
cf966838 | 1729 | break; |
33b64eb2 | 1730 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1731 | case NL80211_IFTYPE_MESH_POINT: |
472dbc45 | 1732 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1733 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1734 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
ec634fe3 | 1735 | ret = NETDEV_TX_OK; |
e32f85f7 | 1736 | goto fail; |
33b64eb2 | 1737 | } |
79617dee | 1738 | |
47846c9b JB |
1739 | if (compare_ether_addr(sdata->vif.addr, |
1740 | skb->data + ETH_ALEN) == 0) { | |
3c5772a5 JC |
1741 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1742 | skb->data, skb->data + ETH_ALEN); | |
1743 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
1744 | sdata, NULL, NULL, NULL); | |
79617dee Y |
1745 | } else { |
1746 | /* packet from other interface */ | |
1747 | struct mesh_path *mppath; | |
3c5772a5 | 1748 | int is_mesh_mcast = 1; |
15ff6365 | 1749 | const u8 *mesh_da; |
79617dee | 1750 | |
3c5772a5 | 1751 | rcu_read_lock(); |
79617dee | 1752 | if (is_multicast_ether_addr(skb->data)) |
3c5772a5 JC |
1753 | /* DA TA mSA AE:SA */ |
1754 | mesh_da = skb->data; | |
79617dee | 1755 | else { |
15ff6365 JB |
1756 | static const u8 bcast[ETH_ALEN] = |
1757 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
1758 | ||
79617dee | 1759 | mppath = mpp_path_lookup(skb->data, sdata); |
3c5772a5 JC |
1760 | if (mppath) { |
1761 | /* RA TA mDA mSA AE:DA SA */ | |
1762 | mesh_da = mppath->mpp; | |
1763 | is_mesh_mcast = 0; | |
15ff6365 | 1764 | } else { |
3c5772a5 | 1765 | /* DA TA mSA AE:SA */ |
15ff6365 JB |
1766 | mesh_da = bcast; |
1767 | } | |
79617dee | 1768 | } |
3c5772a5 | 1769 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
47846c9b | 1770 | mesh_da, sdata->vif.addr); |
3c5772a5 JC |
1771 | rcu_read_unlock(); |
1772 | if (is_mesh_mcast) | |
1773 | meshhdrlen = | |
1774 | ieee80211_new_mesh_header(&mesh_hdr, | |
1775 | sdata, | |
1776 | skb->data + ETH_ALEN, | |
1777 | NULL, | |
1778 | NULL); | |
1779 | else | |
1780 | meshhdrlen = | |
1781 | ieee80211_new_mesh_header(&mesh_hdr, | |
1782 | sdata, | |
1783 | NULL, | |
1784 | skb->data, | |
1785 | skb->data + ETH_ALEN); | |
79617dee | 1786 | |
79617dee | 1787 | } |
33b64eb2 LCC |
1788 | break; |
1789 | #endif | |
05c914fe | 1790 | case NL80211_IFTYPE_STATION: |
46900298 | 1791 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
9bc383de | 1792 | if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) { |
f14543ee FF |
1793 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
1794 | /* RA TA DA SA */ | |
47846c9b | 1795 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
f14543ee FF |
1796 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1797 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1798 | hdrlen = 30; | |
1799 | } else { | |
1800 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); | |
1801 | /* BSSID SA DA */ | |
1802 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1803 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1804 | hdrlen = 24; | |
1805 | } | |
cf966838 | 1806 | break; |
05c914fe | 1807 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1808 | /* DA SA BSSID */ |
1809 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1810 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
46900298 | 1811 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
e2ebc74d | 1812 | hdrlen = 24; |
cf966838 JB |
1813 | break; |
1814 | default: | |
ec634fe3 | 1815 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1816 | goto fail; |
1817 | } | |
1818 | ||
7d185b8b JB |
1819 | /* |
1820 | * There's no need to try to look up the destination | |
1821 | * if it is a multicast address (which can only happen | |
1822 | * in AP mode) | |
1823 | */ | |
1824 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1825 | rcu_read_lock(); |
abe60632 JB |
1826 | sta = sta_info_get(sdata, hdr.addr1); |
1827 | if (sta) | |
07346f81 | 1828 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1829 | rcu_read_unlock(); |
e2ebc74d JB |
1830 | } |
1831 | ||
3434fbd3 | 1832 | /* receiver and we are QoS enabled, use a QoS type frame */ |
176be728 | 1833 | if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { |
065e9605 | 1834 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1835 | hdrlen += 2; |
1836 | } | |
1837 | ||
1838 | /* | |
238814fd JB |
1839 | * Drop unicast frames to unauthorised stations unless they are |
1840 | * EAPOL frames from the local station. | |
ce3edf6d | 1841 | */ |
e32f85f7 LCC |
1842 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1843 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1844 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1845 | !(ethertype == ETH_P_PAE && | |
47846c9b | 1846 | compare_ether_addr(sdata->vif.addr, |
ce3edf6d JB |
1847 | skb->data + ETH_ALEN) == 0))) { |
1848 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1849 | if (net_ratelimit()) |
0c68ae26 | 1850 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1851 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1852 | hdr.addr1); |
ce3edf6d JB |
1853 | #endif |
1854 | ||
1855 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1856 | ||
ec634fe3 | 1857 | ret = NETDEV_TX_OK; |
ce3edf6d JB |
1858 | goto fail; |
1859 | } | |
1860 | ||
065e9605 | 1861 | hdr.frame_control = fc; |
e2ebc74d JB |
1862 | hdr.duration_id = 0; |
1863 | hdr.seq_ctrl = 0; | |
1864 | ||
1865 | skip_header_bytes = ETH_HLEN; | |
1866 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1867 | encaps_data = bridge_tunnel_header; | |
1868 | encaps_len = sizeof(bridge_tunnel_header); | |
1869 | skip_header_bytes -= 2; | |
1870 | } else if (ethertype >= 0x600) { | |
1871 | encaps_data = rfc1042_header; | |
1872 | encaps_len = sizeof(rfc1042_header); | |
1873 | skip_header_bytes -= 2; | |
1874 | } else { | |
1875 | encaps_data = NULL; | |
1876 | encaps_len = 0; | |
1877 | } | |
1878 | ||
1879 | skb_pull(skb, skip_header_bytes); | |
1880 | nh_pos -= skip_header_bytes; | |
1881 | h_pos -= skip_header_bytes; | |
1882 | ||
23c0752a | 1883 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1884 | |
23c0752a JB |
1885 | /* |
1886 | * So we need to modify the skb header and hence need a copy of | |
1887 | * that. The head_need variable above doesn't, so far, include | |
1888 | * the needed header space that we don't need right away. If we | |
1889 | * can, then we don't reallocate right now but only after the | |
1890 | * frame arrives at the master device (if it does...) | |
1891 | * | |
1892 | * If we cannot, however, then we will reallocate to include all | |
1893 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1894 | * make it big enough for everything we may ever need. | |
1895 | */ | |
e2ebc74d | 1896 | |
3a5be7d4 | 1897 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1898 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1899 | head_need += local->tx_headroom; | |
1900 | head_need = max_t(int, 0, head_need); | |
1901 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1902 | goto fail; |
e2ebc74d JB |
1903 | } |
1904 | ||
1905 | if (encaps_data) { | |
1906 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1907 | nh_pos += encaps_len; | |
1908 | h_pos += encaps_len; | |
1909 | } | |
c29b9b9b | 1910 | |
33b64eb2 LCC |
1911 | if (meshhdrlen > 0) { |
1912 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1913 | nh_pos += meshhdrlen; | |
1914 | h_pos += meshhdrlen; | |
1915 | } | |
1916 | ||
065e9605 | 1917 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1918 | __le16 *qos_control; |
1919 | ||
1920 | qos_control = (__le16*) skb_push(skb, 2); | |
1921 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1922 | /* | |
1923 | * Maybe we could actually set some fields here, for now just | |
1924 | * initialise to zero to indicate no special operation. | |
1925 | */ | |
1926 | *qos_control = 0; | |
1927 | } else | |
1928 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1929 | ||
e2ebc74d JB |
1930 | nh_pos += hdrlen; |
1931 | h_pos += hdrlen; | |
1932 | ||
68aae116 SH |
1933 | dev->stats.tx_packets++; |
1934 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1935 | |
1936 | /* Update skb pointers to various headers since this modified frame | |
1937 | * is going to go through Linux networking code that may potentially | |
1938 | * need things like pointer to IP header. */ | |
1939 | skb_set_mac_header(skb, 0); | |
1940 | skb_set_network_header(skb, nh_pos); | |
1941 | skb_set_transport_header(skb, h_pos); | |
1942 | ||
3b8d81e0 JB |
1943 | memset(info, 0, sizeof(*info)); |
1944 | ||
e2ebc74d | 1945 | dev->trans_start = jiffies; |
3b8d81e0 | 1946 | ieee80211_xmit(sdata, skb); |
e2ebc74d | 1947 | |
ec634fe3 | 1948 | return NETDEV_TX_OK; |
e2ebc74d JB |
1949 | |
1950 | fail: | |
ec634fe3 | 1951 | if (ret == NETDEV_TX_OK) |
e2ebc74d JB |
1952 | dev_kfree_skb(skb); |
1953 | ||
1954 | return ret; | |
1955 | } | |
1956 | ||
e2ebc74d | 1957 | |
e2530083 JB |
1958 | /* |
1959 | * ieee80211_clear_tx_pending may not be called in a context where | |
1960 | * it is possible that it packets could come in again. | |
1961 | */ | |
e2ebc74d JB |
1962 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1963 | { | |
2de8e0d9 | 1964 | int i; |
e2ebc74d | 1965 | |
2a577d98 JB |
1966 | for (i = 0; i < local->hw.queues; i++) |
1967 | skb_queue_purge(&local->pending[i]); | |
e2ebc74d JB |
1968 | } |
1969 | ||
cd8ffc80 JB |
1970 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
1971 | struct sk_buff *skb) | |
1972 | { | |
1973 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1974 | struct ieee80211_sub_if_data *sdata; | |
1975 | struct sta_info *sta; | |
1976 | struct ieee80211_hdr *hdr; | |
cd8ffc80 JB |
1977 | int ret; |
1978 | bool result = true; | |
1979 | ||
5061b0c2 | 1980 | sdata = vif_to_sdata(info->control.vif); |
cd8ffc80 JB |
1981 | |
1982 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { | |
5061b0c2 | 1983 | ieee80211_tx(sdata, skb, true); |
cd8ffc80 JB |
1984 | } else { |
1985 | hdr = (struct ieee80211_hdr *)skb->data; | |
abe60632 | 1986 | sta = sta_info_get(sdata, hdr->addr1); |
cd8ffc80 | 1987 | |
3b8d81e0 | 1988 | ret = __ieee80211_tx(local, &skb, sta, true); |
cd8ffc80 JB |
1989 | if (ret != IEEE80211_TX_OK) |
1990 | result = false; | |
1991 | } | |
1992 | ||
cd8ffc80 JB |
1993 | return result; |
1994 | } | |
1995 | ||
e2530083 | 1996 | /* |
3b8d81e0 | 1997 | * Transmit all pending packets. Called from tasklet. |
e2530083 | 1998 | */ |
e2ebc74d JB |
1999 | void ieee80211_tx_pending(unsigned long data) |
2000 | { | |
2001 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
7236fe29 | 2002 | struct ieee80211_sub_if_data *sdata; |
2a577d98 | 2003 | unsigned long flags; |
cd8ffc80 | 2004 | int i; |
3b8d81e0 | 2005 | bool txok; |
e2ebc74d | 2006 | |
f0e72851 | 2007 | rcu_read_lock(); |
e2530083 | 2008 | |
3b8d81e0 | 2009 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
2a577d98 JB |
2010 | for (i = 0; i < local->hw.queues; i++) { |
2011 | /* | |
2012 | * If queue is stopped by something other than due to pending | |
2013 | * frames, or we have no pending frames, proceed to next queue. | |
2014 | */ | |
3b8d81e0 | 2015 | if (local->queue_stop_reasons[i] || |
2a577d98 | 2016 | skb_queue_empty(&local->pending[i])) |
e2ebc74d | 2017 | continue; |
e2530083 | 2018 | |
2a577d98 | 2019 | while (!skb_queue_empty(&local->pending[i])) { |
3b8d81e0 | 2020 | struct sk_buff *skb = __skb_dequeue(&local->pending[i]); |
5061b0c2 | 2021 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
5061b0c2 | 2022 | |
a7bc376c JB |
2023 | if (WARN_ON(!info->control.vif)) { |
2024 | kfree_skb(skb); | |
2025 | continue; | |
2026 | } | |
2027 | ||
3b8d81e0 JB |
2028 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
2029 | flags); | |
2030 | ||
2031 | txok = ieee80211_tx_pending_skb(local, skb); | |
2032 | if (!txok) | |
2033 | __skb_queue_head(&local->pending[i], skb); | |
2034 | spin_lock_irqsave(&local->queue_stop_reason_lock, | |
2035 | flags); | |
2036 | if (!txok) | |
2a577d98 | 2037 | break; |
e2ebc74d | 2038 | } |
7236fe29 JB |
2039 | |
2040 | if (skb_queue_empty(&local->pending[i])) | |
2041 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
2042 | netif_tx_wake_queue( | |
2043 | netdev_get_tx_queue(sdata->dev, i)); | |
e2ebc74d | 2044 | } |
3b8d81e0 | 2045 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
2a577d98 | 2046 | |
f0e72851 | 2047 | rcu_read_unlock(); |
e2ebc74d JB |
2048 | } |
2049 | ||
2050 | /* functions for drivers to get certain frames */ | |
2051 | ||
8e7be8da | 2052 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
2053 | struct sk_buff *skb, |
2054 | struct beacon_data *beacon) | |
e2ebc74d JB |
2055 | { |
2056 | u8 *pos, *tim; | |
2057 | int aid0 = 0; | |
2058 | int i, have_bits = 0, n1, n2; | |
2059 | ||
2060 | /* Generate bitmap for TIM only if there are any STAs in power save | |
2061 | * mode. */ | |
e2ebc74d JB |
2062 | if (atomic_read(&bss->num_sta_ps) > 0) |
2063 | /* in the hope that this is faster than | |
2064 | * checking byte-for-byte */ | |
2065 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
2066 | IEEE80211_MAX_AID+1); | |
2067 | ||
2068 | if (bss->dtim_count == 0) | |
5dfdaf58 | 2069 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
2070 | else |
2071 | bss->dtim_count--; | |
2072 | ||
2073 | tim = pos = (u8 *) skb_put(skb, 6); | |
2074 | *pos++ = WLAN_EID_TIM; | |
2075 | *pos++ = 4; | |
2076 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 2077 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
2078 | |
2079 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
2080 | aid0 = 1; | |
2081 | ||
2082 | if (have_bits) { | |
2083 | /* Find largest even number N1 so that bits numbered 1 through | |
2084 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
2085 | * (N2 + 1) x 8 through 2007 are 0. */ | |
2086 | n1 = 0; | |
2087 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
2088 | if (bss->tim[i]) { | |
2089 | n1 = i & 0xfe; | |
2090 | break; | |
2091 | } | |
2092 | } | |
2093 | n2 = n1; | |
2094 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
2095 | if (bss->tim[i]) { | |
2096 | n2 = i; | |
2097 | break; | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | /* Bitmap control */ | |
2102 | *pos++ = n1 | aid0; | |
2103 | /* Part Virt Bitmap */ | |
2104 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
2105 | ||
2106 | tim[1] = n2 - n1 + 4; | |
2107 | skb_put(skb, n2 - n1); | |
2108 | } else { | |
2109 | *pos++ = aid0; /* Bitmap control */ | |
2110 | *pos++ = 0; /* Part Virt Bitmap */ | |
2111 | } | |
e2ebc74d JB |
2112 | } |
2113 | ||
eddcbb94 JB |
2114 | struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, |
2115 | struct ieee80211_vif *vif, | |
2116 | u16 *tim_offset, u16 *tim_length) | |
e2ebc74d JB |
2117 | { |
2118 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 2119 | struct sk_buff *skb = NULL; |
e039fa4a | 2120 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
2121 | struct ieee80211_sub_if_data *sdata = NULL; |
2122 | struct ieee80211_if_ap *ap = NULL; | |
5dfdaf58 | 2123 | struct beacon_data *beacon; |
8318d78a | 2124 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 2125 | enum ieee80211_band band = local->hw.conf.channel->band; |
e00cfce0 | 2126 | struct ieee80211_tx_rate_control txrc; |
8318d78a | 2127 | |
2e92e6f2 | 2128 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
2129 | |
2130 | rcu_read_lock(); | |
e2ebc74d | 2131 | |
32bfd35d | 2132 | sdata = vif_to_sdata(vif); |
e2ebc74d | 2133 | |
eddcbb94 JB |
2134 | if (tim_offset) |
2135 | *tim_offset = 0; | |
2136 | if (tim_length) | |
2137 | *tim_length = 0; | |
2138 | ||
05c914fe | 2139 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
2140 | ap = &sdata->u.ap; |
2141 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
2142 | if (ap && beacon) { |
2143 | /* | |
2144 | * headroom, head length, | |
2145 | * tail length and maximum TIM length | |
2146 | */ | |
2147 | skb = dev_alloc_skb(local->tx_headroom + | |
2148 | beacon->head_len + | |
2149 | beacon->tail_len + 256); | |
2150 | if (!skb) | |
2151 | goto out; | |
33b64eb2 | 2152 | |
902acc78 JB |
2153 | skb_reserve(skb, local->tx_headroom); |
2154 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
2155 | beacon->head_len); | |
33b64eb2 | 2156 | |
d0709a65 JB |
2157 | /* |
2158 | * Not very nice, but we want to allow the driver to call | |
2159 | * ieee80211_beacon_get() as a response to the set_tim() | |
2160 | * callback. That, however, is already invoked under the | |
2161 | * sta_lock to guarantee consistent and race-free update | |
2162 | * of the tim bitmap in mac80211 and the driver. | |
2163 | */ | |
2164 | if (local->tim_in_locked_section) { | |
8e7be8da | 2165 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2166 | } else { |
2167 | unsigned long flags; | |
2168 | ||
2169 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 2170 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2171 | spin_unlock_irqrestore(&local->sta_lock, flags); |
2172 | } | |
33b64eb2 | 2173 | |
eddcbb94 JB |
2174 | if (tim_offset) |
2175 | *tim_offset = beacon->head_len; | |
2176 | if (tim_length) | |
2177 | *tim_length = skb->len - beacon->head_len; | |
2178 | ||
902acc78 JB |
2179 | if (beacon->tail) |
2180 | memcpy(skb_put(skb, beacon->tail_len), | |
2181 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
2182 | } else |
2183 | goto out; | |
05c914fe | 2184 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
46900298 | 2185 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
9d139c81 | 2186 | struct ieee80211_hdr *hdr; |
af8cdcd8 | 2187 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
33b64eb2 | 2188 | |
af8cdcd8 | 2189 | if (!presp) |
9d139c81 JB |
2190 | goto out; |
2191 | ||
af8cdcd8 | 2192 | skb = skb_copy(presp, GFP_ATOMIC); |
9d139c81 JB |
2193 | if (!skb) |
2194 | goto out; | |
2195 | ||
2196 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
2197 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2198 | IEEE80211_STYPE_BEACON); | |
902acc78 | 2199 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
2200 | struct ieee80211_mgmt *mgmt; |
2201 | u8 *pos; | |
2202 | ||
902acc78 JB |
2203 | /* headroom, head length, tail length and maximum TIM length */ |
2204 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
2205 | if (!skb) | |
2206 | goto out; | |
2207 | ||
2208 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2209 | mgmt = (struct ieee80211_mgmt *) | |
2210 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
2211 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
2212 | mgmt->frame_control = |
2213 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 | 2214 | memset(mgmt->da, 0xff, ETH_ALEN); |
47846c9b JB |
2215 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
2216 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
902acc78 | 2217 | mgmt->u.beacon.beacon_int = |
57c4d7b4 | 2218 | cpu_to_le16(sdata->vif.bss_conf.beacon_int); |
902acc78 JB |
2219 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ |
2220 | ||
2221 | pos = skb_put(skb, 2); | |
2222 | *pos++ = WLAN_EID_SSID; | |
2223 | *pos++ = 0x0; | |
2224 | ||
f698d856 | 2225 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
2226 | } else { |
2227 | WARN_ON(1); | |
5dfdaf58 | 2228 | goto out; |
e2ebc74d JB |
2229 | } |
2230 | ||
e039fa4a JB |
2231 | info = IEEE80211_SKB_CB(skb); |
2232 | ||
3b8d81e0 | 2233 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
e00cfce0 | 2234 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
e039fa4a | 2235 | info->band = band; |
e00cfce0 JM |
2236 | |
2237 | memset(&txrc, 0, sizeof(txrc)); | |
2238 | txrc.hw = hw; | |
2239 | txrc.sband = sband; | |
2240 | txrc.bss_conf = &sdata->vif.bss_conf; | |
2241 | txrc.skb = skb; | |
2242 | txrc.reported_rate.idx = -1; | |
37eb0b16 JM |
2243 | txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; |
2244 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) | |
2245 | txrc.max_rate_idx = -1; | |
2246 | else | |
2247 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
e00cfce0 JM |
2248 | txrc.ap = true; |
2249 | rate_control_get_rate(sdata, NULL, &txrc); | |
e039fa4a JB |
2250 | |
2251 | info->control.vif = vif; | |
f591fa5d | 2252 | |
f591fa5d JB |
2253 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
2254 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e6a9854b | 2255 | out: |
5dfdaf58 | 2256 | rcu_read_unlock(); |
e2ebc74d JB |
2257 | return skb; |
2258 | } | |
eddcbb94 | 2259 | EXPORT_SYMBOL(ieee80211_beacon_get_tim); |
e2ebc74d | 2260 | |
7044cc56 KV |
2261 | struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, |
2262 | struct ieee80211_vif *vif) | |
2263 | { | |
2264 | struct ieee80211_sub_if_data *sdata; | |
2265 | struct ieee80211_if_managed *ifmgd; | |
2266 | struct ieee80211_pspoll *pspoll; | |
2267 | struct ieee80211_local *local; | |
2268 | struct sk_buff *skb; | |
2269 | ||
2270 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2271 | return NULL; | |
2272 | ||
2273 | sdata = vif_to_sdata(vif); | |
2274 | ifmgd = &sdata->u.mgd; | |
2275 | local = sdata->local; | |
2276 | ||
2277 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); | |
2278 | if (!skb) { | |
2279 | printk(KERN_DEBUG "%s: failed to allocate buffer for " | |
2280 | "pspoll template\n", sdata->name); | |
2281 | return NULL; | |
2282 | } | |
2283 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2284 | ||
2285 | pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); | |
2286 | memset(pspoll, 0, sizeof(*pspoll)); | |
2287 | pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
2288 | IEEE80211_STYPE_PSPOLL); | |
2289 | pspoll->aid = cpu_to_le16(ifmgd->aid); | |
2290 | ||
2291 | /* aid in PS-Poll has its two MSBs each set to 1 */ | |
2292 | pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); | |
2293 | ||
2294 | memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); | |
2295 | memcpy(pspoll->ta, vif->addr, ETH_ALEN); | |
2296 | ||
2297 | return skb; | |
2298 | } | |
2299 | EXPORT_SYMBOL(ieee80211_pspoll_get); | |
2300 | ||
2301 | struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, | |
2302 | struct ieee80211_vif *vif) | |
2303 | { | |
2304 | struct ieee80211_hdr_3addr *nullfunc; | |
2305 | struct ieee80211_sub_if_data *sdata; | |
2306 | struct ieee80211_if_managed *ifmgd; | |
2307 | struct ieee80211_local *local; | |
2308 | struct sk_buff *skb; | |
2309 | ||
2310 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2311 | return NULL; | |
2312 | ||
2313 | sdata = vif_to_sdata(vif); | |
2314 | ifmgd = &sdata->u.mgd; | |
2315 | local = sdata->local; | |
2316 | ||
2317 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); | |
2318 | if (!skb) { | |
2319 | printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " | |
2320 | "template\n", sdata->name); | |
2321 | return NULL; | |
2322 | } | |
2323 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2324 | ||
2325 | nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, | |
2326 | sizeof(*nullfunc)); | |
2327 | memset(nullfunc, 0, sizeof(*nullfunc)); | |
2328 | nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
2329 | IEEE80211_STYPE_NULLFUNC | | |
2330 | IEEE80211_FCTL_TODS); | |
2331 | memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); | |
2332 | memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); | |
2333 | memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); | |
2334 | ||
2335 | return skb; | |
2336 | } | |
2337 | EXPORT_SYMBOL(ieee80211_nullfunc_get); | |
2338 | ||
05e54ea6 KV |
2339 | struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, |
2340 | struct ieee80211_vif *vif, | |
2341 | const u8 *ssid, size_t ssid_len, | |
2342 | const u8 *ie, size_t ie_len) | |
2343 | { | |
2344 | struct ieee80211_sub_if_data *sdata; | |
2345 | struct ieee80211_local *local; | |
2346 | struct ieee80211_hdr_3addr *hdr; | |
2347 | struct sk_buff *skb; | |
2348 | size_t ie_ssid_len; | |
2349 | u8 *pos; | |
2350 | ||
2351 | sdata = vif_to_sdata(vif); | |
2352 | local = sdata->local; | |
2353 | ie_ssid_len = 2 + ssid_len; | |
2354 | ||
2355 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + | |
2356 | ie_ssid_len + ie_len); | |
2357 | if (!skb) { | |
2358 | printk(KERN_DEBUG "%s: failed to allocate buffer for probe " | |
2359 | "request template\n", sdata->name); | |
2360 | return NULL; | |
2361 | } | |
2362 | ||
2363 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2364 | ||
2365 | hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); | |
2366 | memset(hdr, 0, sizeof(*hdr)); | |
2367 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
2368 | IEEE80211_STYPE_PROBE_REQ); | |
2369 | memset(hdr->addr1, 0xff, ETH_ALEN); | |
2370 | memcpy(hdr->addr2, vif->addr, ETH_ALEN); | |
2371 | memset(hdr->addr3, 0xff, ETH_ALEN); | |
2372 | ||
2373 | pos = skb_put(skb, ie_ssid_len); | |
2374 | *pos++ = WLAN_EID_SSID; | |
2375 | *pos++ = ssid_len; | |
2376 | if (ssid) | |
2377 | memcpy(pos, ssid, ssid_len); | |
2378 | pos += ssid_len; | |
2379 | ||
2380 | if (ie) { | |
2381 | pos = skb_put(skb, ie_len); | |
2382 | memcpy(pos, ie, ie_len); | |
2383 | } | |
2384 | ||
2385 | return skb; | |
2386 | } | |
2387 | EXPORT_SYMBOL(ieee80211_probereq_get); | |
2388 | ||
32bfd35d | 2389 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2390 | const void *frame, size_t frame_len, |
e039fa4a | 2391 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2392 | struct ieee80211_rts *rts) |
2393 | { | |
2394 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2395 | |
065e9605 HH |
2396 | rts->frame_control = |
2397 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
2398 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2399 | frame_txctl); | |
e2ebc74d JB |
2400 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2401 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2402 | } | |
2403 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2404 | ||
32bfd35d | 2405 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2406 | const void *frame, size_t frame_len, |
e039fa4a | 2407 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2408 | struct ieee80211_cts *cts) |
2409 | { | |
2410 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2411 | |
065e9605 HH |
2412 | cts->frame_control = |
2413 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2414 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2415 | frame_len, frame_txctl); | |
e2ebc74d JB |
2416 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2417 | } | |
2418 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2419 | ||
2420 | struct sk_buff * | |
32bfd35d | 2421 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2422 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2423 | { |
2424 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2425 | struct sk_buff *skb = NULL; |
e2ebc74d | 2426 | struct sta_info *sta; |
5cf121c3 | 2427 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2428 | struct ieee80211_sub_if_data *sdata; |
2429 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2430 | struct beacon_data *beacon; |
e039fa4a | 2431 | struct ieee80211_tx_info *info; |
e2ebc74d | 2432 | |
32bfd35d | 2433 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2434 | bss = &sdata->u.ap; |
5dfdaf58 | 2435 | |
5dfdaf58 JB |
2436 | rcu_read_lock(); |
2437 | beacon = rcu_dereference(bss->beacon); | |
2438 | ||
05c914fe | 2439 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2440 | goto out; |
5dfdaf58 | 2441 | |
e2ebc74d | 2442 | if (bss->dtim_count != 0) |
747cf5e9 | 2443 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2444 | |
e2ebc74d JB |
2445 | while (1) { |
2446 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2447 | if (!skb) | |
747cf5e9 | 2448 | goto out; |
e2ebc74d JB |
2449 | local->total_ps_buffered--; |
2450 | ||
2451 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2452 | struct ieee80211_hdr *hdr = | |
2453 | (struct ieee80211_hdr *) skb->data; | |
2454 | /* more buffered multicast/broadcast frames ==> set | |
2455 | * MoreData flag in IEEE 802.11 header to inform PS | |
2456 | * STAs */ | |
2457 | hdr->frame_control |= | |
2458 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2459 | } | |
2460 | ||
3b8d81e0 | 2461 | if (!ieee80211_tx_prepare(sdata, &tx, skb)) |
e2ebc74d JB |
2462 | break; |
2463 | dev_kfree_skb_any(skb); | |
2464 | } | |
e039fa4a JB |
2465 | |
2466 | info = IEEE80211_SKB_CB(skb); | |
2467 | ||
e2ebc74d | 2468 | sta = tx.sta; |
5cf121c3 JB |
2469 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2470 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2471 | info->band = tx.channel->band; |
e2ebc74d | 2472 | |
97b045d6 | 2473 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2474 | skb = NULL; |
97b045d6 | 2475 | out: |
d0709a65 | 2476 | rcu_read_unlock(); |
e2ebc74d JB |
2477 | |
2478 | return skb; | |
2479 | } | |
2480 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); | |
3b8d81e0 | 2481 | |
62ae67be | 2482 | void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
3b8d81e0 | 2483 | { |
3b8d81e0 JB |
2484 | skb_set_mac_header(skb, 0); |
2485 | skb_set_network_header(skb, 0); | |
2486 | skb_set_transport_header(skb, 0); | |
2487 | ||
cf0277e7 JB |
2488 | /* send all internal mgmt frames on VO */ |
2489 | skb_set_queue_mapping(skb, 0); | |
2490 | ||
3d34deb6 JB |
2491 | /* |
2492 | * The other path calling ieee80211_xmit is from the tasklet, | |
2493 | * and while we can handle concurrent transmissions locking | |
2494 | * requirements are that we do not come into tx with bhs on. | |
2495 | */ | |
2496 | local_bh_disable(); | |
3b8d81e0 | 2497 | ieee80211_xmit(sdata, skb); |
3d34deb6 | 2498 | local_bh_enable(); |
3b8d81e0 | 2499 | } |