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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 | |
1be7fe8d BJ |
276 | if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) |
277 | return TX_CONTINUE; | |
278 | ||
05c914fe | 279 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
280 | return TX_CONTINUE; |
281 | ||
5cf121c3 | 282 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 283 | return TX_CONTINUE; |
e2ebc74d | 284 | |
07346f81 | 285 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 286 | |
5cf121c3 | 287 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 288 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 289 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 290 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
291 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
292 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 | 293 | "associated station %pM\n", |
47846c9b | 294 | tx->sdata->name, hdr->addr1); |
e2ebc74d JB |
295 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
296 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 297 | return TX_DROP; |
e2ebc74d JB |
298 | } |
299 | } else { | |
358c8d9d | 300 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 301 | tx->local->num_sta == 0 && |
05c914fe | 302 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
303 | /* |
304 | * No associated STAs - no need to send multicast | |
305 | * frames. | |
306 | */ | |
9ae54c84 | 307 | return TX_DROP; |
e2ebc74d | 308 | } |
9ae54c84 | 309 | return TX_CONTINUE; |
e2ebc74d JB |
310 | } |
311 | ||
9ae54c84 | 312 | return TX_CONTINUE; |
e2ebc74d JB |
313 | } |
314 | ||
e2ebc74d JB |
315 | /* This function is called whenever the AP is about to exceed the maximum limit |
316 | * of buffered frames for power saving STAs. This situation should not really | |
317 | * happen often during normal operation, so dropping the oldest buffered packet | |
318 | * from each queue should be OK to make some room for new frames. */ | |
319 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
320 | { | |
321 | int total = 0, purged = 0; | |
322 | struct sk_buff *skb; | |
323 | struct ieee80211_sub_if_data *sdata; | |
324 | struct sta_info *sta; | |
325 | ||
79010420 JB |
326 | /* |
327 | * virtual interfaces are protected by RCU | |
328 | */ | |
329 | rcu_read_lock(); | |
330 | ||
331 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 332 | struct ieee80211_if_ap *ap; |
05c914fe | 333 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
334 | continue; |
335 | ap = &sdata->u.ap; | |
336 | skb = skb_dequeue(&ap->ps_bc_buf); | |
337 | if (skb) { | |
338 | purged++; | |
339 | dev_kfree_skb(skb); | |
340 | } | |
341 | total += skb_queue_len(&ap->ps_bc_buf); | |
342 | } | |
e2ebc74d | 343 | |
d0709a65 | 344 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
345 | skb = skb_dequeue(&sta->ps_tx_buf); |
346 | if (skb) { | |
347 | purged++; | |
348 | dev_kfree_skb(skb); | |
349 | } | |
350 | total += skb_queue_len(&sta->ps_tx_buf); | |
351 | } | |
d0709a65 JB |
352 | |
353 | rcu_read_unlock(); | |
e2ebc74d JB |
354 | |
355 | local->total_ps_buffered = total; | |
54223995 | 356 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0fb9a9ec JP |
357 | wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n", |
358 | purged); | |
f4ea83dd | 359 | #endif |
e2ebc74d JB |
360 | } |
361 | ||
9ae54c84 | 362 | static ieee80211_tx_result |
5cf121c3 | 363 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 364 | { |
e039fa4a | 365 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 366 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 367 | |
7d54d0dd JB |
368 | /* |
369 | * broadcast/multicast frame | |
370 | * | |
371 | * If any of the associated stations is in power save mode, | |
372 | * the frame is buffered to be sent after DTIM beacon frame. | |
373 | * This is done either by the hardware or us. | |
374 | */ | |
375 | ||
3e122be0 JB |
376 | /* powersaving STAs only in AP/VLAN mode */ |
377 | if (!tx->sdata->bss) | |
378 | return TX_CONTINUE; | |
379 | ||
380 | /* no buffering for ordered frames */ | |
358c8d9d | 381 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 382 | return TX_CONTINUE; |
7d54d0dd JB |
383 | |
384 | /* no stations in PS mode */ | |
385 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 386 | return TX_CONTINUE; |
7d54d0dd | 387 | |
62b517cb | 388 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
62b1208e | 389 | |
62b517cb JB |
390 | /* device releases frame after DTIM beacon */ |
391 | if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) | |
62b1208e | 392 | return TX_CONTINUE; |
62b1208e | 393 | |
7d54d0dd | 394 | /* buffered in mac80211 */ |
62b1208e JB |
395 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
396 | purge_old_ps_buffers(tx->local); | |
397 | ||
398 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { | |
54223995 | 399 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
62b1208e JB |
400 | if (net_ratelimit()) |
401 | printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", | |
47846c9b | 402 | tx->sdata->name); |
f4ea83dd | 403 | #endif |
62b1208e JB |
404 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
405 | } else | |
406 | tx->local->total_ps_buffered++; | |
e2ebc74d | 407 | |
62b1208e | 408 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); |
7d54d0dd | 409 | |
62b1208e | 410 | return TX_QUEUED; |
e2ebc74d JB |
411 | } |
412 | ||
fb733336 JM |
413 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
414 | struct sk_buff *skb) | |
415 | { | |
416 | if (!ieee80211_is_mgmt(fc)) | |
417 | return 0; | |
418 | ||
419 | if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) | |
420 | return 0; | |
421 | ||
422 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) | |
423 | skb->data)) | |
424 | return 0; | |
425 | ||
426 | return 1; | |
427 | } | |
428 | ||
9ae54c84 | 429 | static ieee80211_tx_result |
5cf121c3 | 430 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
431 | { |
432 | struct sta_info *sta = tx->sta; | |
e039fa4a | 433 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 434 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
3393a608 | 435 | struct ieee80211_local *local = tx->local; |
07346f81 | 436 | u32 staflags; |
e2ebc74d | 437 | |
f64f9e71 JP |
438 | if (unlikely(!sta || |
439 | ieee80211_is_probe_resp(hdr->frame_control) || | |
440 | ieee80211_is_auth(hdr->frame_control) || | |
441 | ieee80211_is_assoc_resp(hdr->frame_control) || | |
442 | ieee80211_is_reassoc_resp(hdr->frame_control))) | |
9ae54c84 | 443 | return TX_CONTINUE; |
e2ebc74d | 444 | |
07346f81 JB |
445 | staflags = get_sta_flags(sta); |
446 | ||
af818581 | 447 | if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) && |
3fa52056 | 448 | !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) { |
e2ebc74d | 449 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 450 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
e2ebc74d | 451 | "before %d)\n", |
0c68ae26 | 452 | sta->sta.addr, sta->sta.aid, |
e2ebc74d JB |
453 | skb_queue_len(&sta->ps_tx_buf)); |
454 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
455 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
456 | purge_old_ps_buffers(tx->local); | |
457 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
458 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 459 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 460 | if (net_ratelimit()) { |
0c68ae26 | 461 | printk(KERN_DEBUG "%s: STA %pM TX " |
e2ebc74d | 462 | "buffer full - dropping oldest frame\n", |
47846c9b | 463 | tx->sdata->name, sta->sta.addr); |
e2ebc74d | 464 | } |
f4ea83dd | 465 | #endif |
e2ebc74d JB |
466 | dev_kfree_skb(old); |
467 | } else | |
468 | tx->local->total_ps_buffered++; | |
004c872e | 469 | |
af818581 JB |
470 | /* |
471 | * Queue frame to be sent after STA wakes up/polls, | |
472 | * but don't set the TIM bit if the driver is blocking | |
473 | * wakeup or poll response transmissions anyway. | |
474 | */ | |
475 | if (skb_queue_empty(&sta->ps_tx_buf) && | |
476 | !(staflags & WLAN_STA_PS_DRIVER)) | |
004c872e JB |
477 | sta_info_set_tim_bit(sta); |
478 | ||
e039fa4a | 479 | info->control.jiffies = jiffies; |
5061b0c2 | 480 | info->control.vif = &tx->sdata->vif; |
8f77f384 | 481 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
e2ebc74d | 482 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
3393a608 JO |
483 | |
484 | if (!timer_pending(&local->sta_cleanup)) | |
485 | mod_timer(&local->sta_cleanup, | |
486 | round_jiffies(jiffies + | |
487 | STA_INFO_CLEANUP_INTERVAL)); | |
488 | ||
9ae54c84 | 489 | return TX_QUEUED; |
e2ebc74d JB |
490 | } |
491 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
af818581 | 492 | else if (unlikely(staflags & WLAN_STA_PS_STA)) { |
0c68ae26 | 493 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
47846c9b | 494 | "set -> send frame\n", tx->sdata->name, |
0c68ae26 | 495 | sta->sta.addr); |
e2ebc74d JB |
496 | } |
497 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d | 498 | |
9ae54c84 | 499 | return TX_CONTINUE; |
e2ebc74d JB |
500 | } |
501 | ||
d9e8a70f | 502 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 503 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 504 | { |
5cf121c3 | 505 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 506 | return TX_CONTINUE; |
e2ebc74d | 507 | |
5cf121c3 | 508 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
509 | return ieee80211_tx_h_unicast_ps_buf(tx); |
510 | else | |
511 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
512 | } | |
513 | ||
a621fa4d JB |
514 | static ieee80211_tx_result debug_noinline |
515 | ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) | |
516 | { | |
517 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
518 | ||
519 | if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && | |
520 | tx->sdata->control_port_no_encrypt)) | |
521 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; | |
522 | ||
523 | return TX_CONTINUE; | |
524 | } | |
525 | ||
d9e8a70f | 526 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 527 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 528 | { |
d3feaf5a | 529 | struct ieee80211_key *key = NULL; |
e039fa4a | 530 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 531 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 532 | |
3b8d81e0 | 533 | if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) |
e2ebc74d | 534 | tx->key = NULL; |
e31b8213 | 535 | else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) |
d4e46a3d | 536 | tx->key = key; |
3cfcf6ac | 537 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
ecbcd324 JM |
538 | is_multicast_ether_addr(hdr->addr1) && |
539 | ieee80211_is_robust_mgmt_frame(hdr) && | |
3cfcf6ac JM |
540 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) |
541 | tx->key = key; | |
d4e46a3d JB |
542 | else if ((key = rcu_dereference(tx->sdata->default_key))) |
543 | tx->key = key; | |
e2ebc74d | 544 | else if (tx->sdata->drop_unencrypted && |
a621fa4d | 545 | (tx->skb->protocol != tx->sdata->control_port_protocol) && |
e0463f50 JM |
546 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
547 | (!ieee80211_is_robust_mgmt_frame(hdr) || | |
548 | (ieee80211_is_action(hdr->frame_control) && | |
549 | tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { | |
e2ebc74d | 550 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 551 | return TX_DROP; |
176e4f84 | 552 | } else |
e2ebc74d JB |
553 | tx->key = NULL; |
554 | ||
555 | if (tx->key) { | |
813d7669 JB |
556 | bool skip_hw = false; |
557 | ||
e2ebc74d | 558 | tx->key->tx_rx_count++; |
011bfcc4 | 559 | /* TODO: add threshold stuff again */ |
176e4f84 | 560 | |
97359d12 JB |
561 | switch (tx->key->conf.cipher) { |
562 | case WLAN_CIPHER_SUITE_WEP40: | |
563 | case WLAN_CIPHER_SUITE_WEP104: | |
358c8d9d | 564 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 | 565 | break; |
97359d12 | 566 | case WLAN_CIPHER_SUITE_TKIP: |
358c8d9d | 567 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
568 | tx->key = NULL; |
569 | break; | |
97359d12 | 570 | case WLAN_CIPHER_SUITE_CCMP: |
fb733336 JM |
571 | if (!ieee80211_is_data_present(hdr->frame_control) && |
572 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
573 | tx->skb)) | |
574 | tx->key = NULL; | |
3b43a187 KV |
575 | else |
576 | skip_hw = (tx->key->conf.flags & | |
577 | IEEE80211_KEY_FLAG_SW_MGMT) && | |
578 | ieee80211_is_mgmt(hdr->frame_control); | |
fb733336 | 579 | break; |
97359d12 | 580 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
581 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
582 | tx->key = NULL; | |
583 | break; | |
176e4f84 | 584 | } |
813d7669 | 585 | |
f12553eb | 586 | if (!skip_hw && tx->key && |
382b1655 | 587 | tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
813d7669 | 588 | info->control.hw_key = &tx->key->conf; |
e2ebc74d JB |
589 | } |
590 | ||
9ae54c84 | 591 | return TX_CONTINUE; |
e2ebc74d JB |
592 | } |
593 | ||
d9e8a70f | 594 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 595 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 596 | { |
e039fa4a | 597 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
598 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
599 | struct ieee80211_supported_band *sband; | |
600 | struct ieee80211_rate *rate; | |
a2c40249 SZ |
601 | int i; |
602 | u32 len; | |
e6a9854b JB |
603 | bool inval = false, rts = false, short_preamble = false; |
604 | struct ieee80211_tx_rate_control txrc; | |
b770b43e | 605 | u32 sta_flags; |
8318d78a | 606 | |
e6a9854b | 607 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 608 | |
e6a9854b | 609 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 610 | |
a2c40249 | 611 | len = min_t(u32, tx->skb->len + FCS_LEN, |
b9a5f8ca | 612 | tx->local->hw.wiphy->frag_threshold); |
e6a9854b JB |
613 | |
614 | /* set up the tx rate control struct we give the RC algo */ | |
615 | txrc.hw = local_to_hw(tx->local); | |
616 | txrc.sband = sband; | |
617 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
618 | txrc.skb = tx->skb; | |
619 | txrc.reported_rate.idx = -1; | |
37eb0b16 JM |
620 | txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; |
621 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) | |
622 | txrc.max_rate_idx = -1; | |
623 | else | |
624 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
8f0729b1 FF |
625 | txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || |
626 | tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); | |
e6a9854b JB |
627 | |
628 | /* set up RTS protection if desired */ | |
b9a5f8ca | 629 | if (len > tx->local->hw.wiphy->rts_threshold) { |
e6a9854b | 630 | txrc.rts = rts = true; |
e2ebc74d | 631 | } |
e2ebc74d | 632 | |
e6a9854b JB |
633 | /* |
634 | * Use short preamble if the BSS can handle it, but not for | |
635 | * management frames unless we know the receiver can handle | |
636 | * that -- the management frame might be to a station that | |
637 | * just wants a probe response. | |
638 | */ | |
639 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
640 | (ieee80211_is_data(hdr->frame_control) || | |
641 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
642 | txrc.short_preamble = short_preamble = true; | |
e2ebc74d | 643 | |
b770b43e LR |
644 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
645 | ||
646 | /* | |
647 | * Lets not bother rate control if we're associated and cannot | |
648 | * talk to the sta. This should not happen. | |
649 | */ | |
fbe9c429 | 650 | if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && |
b770b43e LR |
651 | (sta_flags & WLAN_STA_ASSOC) && |
652 | !rate_usable_index_exists(sband, &tx->sta->sta), | |
653 | "%s: Dropped data frame as no usable bitrate found while " | |
654 | "scanning and associated. Target station: " | |
655 | "%pM on %d GHz band\n", | |
47846c9b | 656 | tx->sdata->name, hdr->addr1, |
b770b43e LR |
657 | tx->channel->band ? 5 : 2)) |
658 | return TX_DROP; | |
2e92e6f2 | 659 | |
b770b43e LR |
660 | /* |
661 | * If we're associated with the sta at this point we know we can at | |
662 | * least send the frame at the lowest bit rate. | |
663 | */ | |
e6a9854b JB |
664 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
665 | ||
666 | if (unlikely(info->control.rates[0].idx < 0)) | |
667 | return TX_DROP; | |
668 | ||
669 | if (txrc.reported_rate.idx < 0) | |
670 | txrc.reported_rate = info->control.rates[0]; | |
e2ebc74d | 671 | |
e039fa4a | 672 | if (tx->sta) |
e6a9854b | 673 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 674 | |
e6a9854b JB |
675 | if (unlikely(!info->control.rates[0].count)) |
676 | info->control.rates[0].count = 1; | |
e2ebc74d | 677 | |
9955151d GS |
678 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && |
679 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) | |
680 | info->control.rates[0].count = 1; | |
681 | ||
e6a9854b JB |
682 | if (is_multicast_ether_addr(hdr->addr1)) { |
683 | /* | |
684 | * XXX: verify the rate is in the basic rateset | |
685 | */ | |
686 | return TX_CONTINUE; | |
e2ebc74d JB |
687 | } |
688 | ||
e6a9854b JB |
689 | /* |
690 | * set up the RTS/CTS rate as the fastest basic rate | |
691 | * that is not faster than the data rate | |
692 | * | |
693 | * XXX: Should this check all retry rates? | |
694 | */ | |
695 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
696 | s8 baserate = 0; | |
697 | ||
698 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
699 | ||
700 | for (i = 0; i < sband->n_bitrates; i++) { | |
701 | /* must be a basic rate */ | |
702 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
703 | continue; | |
704 | /* must not be faster than the data rate */ | |
705 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
706 | continue; | |
707 | /* maximum */ | |
708 | if (sband->bitrates[baserate].bitrate < | |
709 | sband->bitrates[i].bitrate) | |
710 | baserate = i; | |
711 | } | |
712 | ||
713 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
714 | } |
715 | ||
e6a9854b JB |
716 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
717 | /* | |
718 | * make sure there's no valid rate following | |
719 | * an invalid one, just in case drivers don't | |
720 | * take the API seriously to stop at -1. | |
721 | */ | |
722 | if (inval) { | |
723 | info->control.rates[i].idx = -1; | |
724 | continue; | |
725 | } | |
726 | if (info->control.rates[i].idx < 0) { | |
727 | inval = true; | |
728 | continue; | |
729 | } | |
8318d78a | 730 | |
e6a9854b JB |
731 | /* |
732 | * For now assume MCS is already set up correctly, this | |
733 | * needs to be fixed. | |
734 | */ | |
735 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
736 | WARN_ON(info->control.rates[i].idx > 76); | |
737 | continue; | |
738 | } | |
e2ebc74d | 739 | |
e6a9854b JB |
740 | /* set up RTS protection if desired */ |
741 | if (rts) | |
742 | info->control.rates[i].flags |= | |
743 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 744 | |
e6a9854b | 745 | /* RC is busted */ |
075cbc9e S |
746 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
747 | sband->n_bitrates)) { | |
e6a9854b JB |
748 | info->control.rates[i].idx = -1; |
749 | continue; | |
8318d78a | 750 | } |
e2ebc74d | 751 | |
e6a9854b JB |
752 | rate = &sband->bitrates[info->control.rates[i].idx]; |
753 | ||
754 | /* set up short preamble */ | |
755 | if (short_preamble && | |
756 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
757 | info->control.rates[i].flags |= | |
758 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
759 | ||
760 | /* set up G protection */ | |
761 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
762 | rate->flags & IEEE80211_RATE_ERP_G) | |
763 | info->control.rates[i].flags |= | |
764 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
765 | } |
766 | ||
e6a9854b JB |
767 | return TX_CONTINUE; |
768 | } | |
769 | ||
f591fa5d JB |
770 | static ieee80211_tx_result debug_noinline |
771 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
772 | { | |
773 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
774 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
775 | u16 *seq; | |
776 | u8 *qc; | |
777 | int tid; | |
778 | ||
25d834e1 JB |
779 | /* |
780 | * Packet injection may want to control the sequence | |
781 | * number, if we have no matching interface then we | |
782 | * neither assign one ourselves nor ask the driver to. | |
783 | */ | |
5061b0c2 | 784 | if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) |
25d834e1 JB |
785 | return TX_CONTINUE; |
786 | ||
f591fa5d JB |
787 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
788 | return TX_CONTINUE; | |
789 | ||
790 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
791 | return TX_CONTINUE; | |
792 | ||
94778280 JB |
793 | /* |
794 | * Anything but QoS data that has a sequence number field | |
795 | * (is long enough) gets a sequence number from the global | |
796 | * counter. | |
797 | */ | |
f591fa5d | 798 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 799 | /* driver should assign sequence number */ |
f591fa5d | 800 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
801 | /* for pure STA mode without beacons, we can do it */ |
802 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
803 | tx->sdata->sequence_number += 0x10; | |
f591fa5d JB |
804 | return TX_CONTINUE; |
805 | } | |
806 | ||
807 | /* | |
808 | * This should be true for injected/management frames only, for | |
809 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
810 | * above since they are not QoS-data frames. | |
811 | */ | |
812 | if (!tx->sta) | |
813 | return TX_CONTINUE; | |
814 | ||
815 | /* include per-STA, per-TID sequence counter */ | |
816 | ||
817 | qc = ieee80211_get_qos_ctl(hdr); | |
818 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
819 | seq = &tx->sta->tid_seq[tid]; | |
820 | ||
821 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
822 | ||
823 | /* Increase the sequence number. */ | |
824 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
825 | ||
826 | return TX_CONTINUE; | |
827 | } | |
828 | ||
2de8e0d9 JB |
829 | static int ieee80211_fragment(struct ieee80211_local *local, |
830 | struct sk_buff *skb, int hdrlen, | |
831 | int frag_threshold) | |
832 | { | |
833 | struct sk_buff *tail = skb, *tmp; | |
834 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
835 | int pos = hdrlen + per_fragm; | |
836 | int rem = skb->len - hdrlen - per_fragm; | |
837 | ||
838 | if (WARN_ON(rem < 0)) | |
839 | return -EINVAL; | |
840 | ||
841 | while (rem) { | |
842 | int fraglen = per_fragm; | |
843 | ||
844 | if (fraglen > rem) | |
845 | fraglen = rem; | |
846 | rem -= fraglen; | |
847 | tmp = dev_alloc_skb(local->tx_headroom + | |
848 | frag_threshold + | |
849 | IEEE80211_ENCRYPT_HEADROOM + | |
850 | IEEE80211_ENCRYPT_TAILROOM); | |
851 | if (!tmp) | |
852 | return -ENOMEM; | |
853 | tail->next = tmp; | |
854 | tail = tmp; | |
855 | skb_reserve(tmp, local->tx_headroom + | |
856 | IEEE80211_ENCRYPT_HEADROOM); | |
857 | /* copy control information */ | |
858 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); | |
859 | skb_copy_queue_mapping(tmp, skb); | |
860 | tmp->priority = skb->priority; | |
2de8e0d9 | 861 | tmp->dev = skb->dev; |
2de8e0d9 JB |
862 | |
863 | /* copy header and data */ | |
864 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); | |
865 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); | |
866 | ||
867 | pos += fraglen; | |
868 | } | |
869 | ||
870 | skb->len = hdrlen + per_fragm; | |
871 | return 0; | |
872 | } | |
873 | ||
d9e8a70f | 874 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
875 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
876 | { | |
2de8e0d9 JB |
877 | struct sk_buff *skb = tx->skb; |
878 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
879 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
b9a5f8ca | 880 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; |
2de8e0d9 JB |
881 | int hdrlen; |
882 | int fragnum; | |
e2454948 JB |
883 | |
884 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
885 | return TX_CONTINUE; | |
886 | ||
eefce91a JB |
887 | /* |
888 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
3b8d81e0 | 889 | * This scenario is handled in ieee80211_tx_prepare but extra |
8d5e0d58 | 890 | * caution taken here as fragmented ampdu may cause Tx stop. |
eefce91a | 891 | */ |
8b30b1fe | 892 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
893 | return TX_DROP; |
894 | ||
065e9605 | 895 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 | 896 | |
2de8e0d9 | 897 | /* internal error, why is TX_FRAGMENTED set? */ |
8ccd8f21 | 898 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) |
2de8e0d9 | 899 | return TX_DROP; |
e6a9854b | 900 | |
2de8e0d9 JB |
901 | /* |
902 | * Now fragment the frame. This will allocate all the fragments and | |
903 | * chain them (using skb as the first fragment) to skb->next. | |
904 | * During transmission, we will remove the successfully transmitted | |
905 | * fragments from this list. When the low-level driver rejects one | |
906 | * of the fragments then we will simply pretend to accept the skb | |
907 | * but store it away as pending. | |
908 | */ | |
909 | if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) | |
910 | return TX_DROP; | |
e6a9854b | 911 | |
2de8e0d9 JB |
912 | /* update duration/seq/flags of fragments */ |
913 | fragnum = 0; | |
914 | do { | |
915 | int next_len; | |
916 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
e6a9854b | 917 | |
2de8e0d9 JB |
918 | hdr = (void *)skb->data; |
919 | info = IEEE80211_SKB_CB(skb); | |
e6a9854b | 920 | |
2de8e0d9 JB |
921 | if (skb->next) { |
922 | hdr->frame_control |= morefrags; | |
923 | next_len = skb->next->len; | |
e6a9854b JB |
924 | /* |
925 | * No multi-rate retries for fragmented frames, that | |
926 | * would completely throw off the NAV at other STAs. | |
927 | */ | |
928 | info->control.rates[1].idx = -1; | |
929 | info->control.rates[2].idx = -1; | |
930 | info->control.rates[3].idx = -1; | |
931 | info->control.rates[4].idx = -1; | |
932 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
933 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
2de8e0d9 JB |
934 | } else { |
935 | hdr->frame_control &= ~morefrags; | |
936 | next_len = 0; | |
e6a9854b | 937 | } |
2de8e0d9 JB |
938 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); |
939 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); | |
940 | fragnum++; | |
941 | } while ((skb = skb->next)); | |
e2ebc74d | 942 | |
9ae54c84 | 943 | return TX_CONTINUE; |
e2ebc74d JB |
944 | } |
945 | ||
feff1f2f JB |
946 | static ieee80211_tx_result debug_noinline |
947 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) | |
948 | { | |
949 | struct sk_buff *skb = tx->skb; | |
950 | ||
951 | if (!tx->sta) | |
952 | return TX_CONTINUE; | |
953 | ||
954 | tx->sta->tx_packets++; | |
955 | do { | |
956 | tx->sta->tx_fragments++; | |
957 | tx->sta->tx_bytes += skb->len; | |
958 | } while ((skb = skb->next)); | |
959 | ||
960 | return TX_CONTINUE; | |
961 | } | |
962 | ||
d9e8a70f | 963 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
964 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
965 | { | |
3ffc2a90 JB |
966 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
967 | ||
e2454948 JB |
968 | if (!tx->key) |
969 | return TX_CONTINUE; | |
970 | ||
97359d12 JB |
971 | switch (tx->key->conf.cipher) { |
972 | case WLAN_CIPHER_SUITE_WEP40: | |
973 | case WLAN_CIPHER_SUITE_WEP104: | |
e2454948 | 974 | return ieee80211_crypto_wep_encrypt(tx); |
97359d12 | 975 | case WLAN_CIPHER_SUITE_TKIP: |
e2454948 | 976 | return ieee80211_crypto_tkip_encrypt(tx); |
97359d12 | 977 | case WLAN_CIPHER_SUITE_CCMP: |
e2454948 | 978 | return ieee80211_crypto_ccmp_encrypt(tx); |
97359d12 | 979 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac | 980 | return ieee80211_crypto_aes_cmac_encrypt(tx); |
3ffc2a90 JB |
981 | default: |
982 | /* handle hw-only algorithm */ | |
983 | if (info->control.hw_key) { | |
984 | ieee80211_tx_set_protected(tx); | |
985 | return TX_CONTINUE; | |
986 | } | |
987 | break; | |
988 | ||
e2454948 JB |
989 | } |
990 | ||
e2454948 JB |
991 | return TX_DROP; |
992 | } | |
993 | ||
d9e8a70f | 994 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
995 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
996 | { | |
2de8e0d9 JB |
997 | struct sk_buff *skb = tx->skb; |
998 | struct ieee80211_hdr *hdr; | |
999 | int next_len; | |
1000 | bool group_addr; | |
03f93c3d | 1001 | |
2de8e0d9 JB |
1002 | do { |
1003 | hdr = (void *) skb->data; | |
7e0aae47 JM |
1004 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) |
1005 | break; /* must not overwrite AID */ | |
2de8e0d9 JB |
1006 | next_len = skb->next ? skb->next->len : 0; |
1007 | group_addr = is_multicast_ether_addr(hdr->addr1); | |
03f93c3d | 1008 | |
2de8e0d9 JB |
1009 | hdr->duration_id = |
1010 | ieee80211_duration(tx, group_addr, next_len); | |
1011 | } while ((skb = skb->next)); | |
03f93c3d JB |
1012 | |
1013 | return TX_CONTINUE; | |
1014 | } | |
1015 | ||
e2ebc74d JB |
1016 | /* actual transmit path */ |
1017 | ||
1018 | /* | |
1019 | * deal with packet injection down monitor interface | |
1020 | * with Radiotap Header -- only called for monitor mode interface | |
1021 | */ | |
27004b10 JB |
1022 | static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
1023 | struct sk_buff *skb) | |
e2ebc74d JB |
1024 | { |
1025 | /* | |
1026 | * this is the moment to interpret and discard the radiotap header that | |
1027 | * must be at the start of the packet injected in Monitor mode | |
1028 | * | |
1029 | * Need to take some care with endian-ness since radiotap | |
1030 | * args are little-endian | |
1031 | */ | |
1032 | ||
1033 | struct ieee80211_radiotap_iterator iterator; | |
1034 | struct ieee80211_radiotap_header *rthdr = | |
1035 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 1036 | struct ieee80211_supported_band *sband; |
f23a4780 | 1037 | bool hw_frag; |
3b8d81e0 | 1038 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
33e5a2f7 JB |
1039 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, |
1040 | NULL); | |
e2ebc74d | 1041 | |
2e92e6f2 | 1042 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 1043 | |
3b8d81e0 | 1044 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
5cf121c3 | 1045 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d | 1046 | |
f23a4780 AN |
1047 | /* packet is fragmented in HW if we have a non-NULL driver callback */ |
1048 | hw_frag = (tx->local->ops->set_frag_threshold != NULL); | |
1049 | ||
e2ebc74d JB |
1050 | /* |
1051 | * for every radiotap entry that is present | |
1052 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
1053 | * entries present, or -EINVAL on error) | |
1054 | */ | |
1055 | ||
1056 | while (!ret) { | |
e2ebc74d JB |
1057 | ret = ieee80211_radiotap_iterator_next(&iterator); |
1058 | ||
1059 | if (ret) | |
1060 | continue; | |
1061 | ||
1062 | /* see if this argument is something we can use */ | |
1063 | switch (iterator.this_arg_index) { | |
1064 | /* | |
1065 | * You must take care when dereferencing iterator.this_arg | |
1066 | * for multibyte types... the pointer is not aligned. Use | |
1067 | * get_unaligned((type *)iterator.this_arg) to dereference | |
1068 | * iterator.this_arg for type "type" safely on all arches. | |
1069 | */ | |
e2ebc74d JB |
1070 | case IEEE80211_RADIOTAP_FLAGS: |
1071 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
1072 | /* | |
1073 | * this indicates that the skb we have been | |
1074 | * handed has the 32-bit FCS CRC at the end... | |
1075 | * we should react to that by snipping it off | |
1076 | * because it will be recomputed and added | |
1077 | * on transmission | |
1078 | */ | |
33e5a2f7 | 1079 | if (skb->len < (iterator._max_length + FCS_LEN)) |
27004b10 | 1080 | return false; |
e2ebc74d JB |
1081 | |
1082 | skb_trim(skb, skb->len - FCS_LEN); | |
1083 | } | |
58d4185e | 1084 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
3b8d81e0 | 1085 | info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; |
f23a4780 AN |
1086 | if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) && |
1087 | !hw_frag) | |
5cf121c3 | 1088 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1089 | break; |
1090 | ||
58d4185e JB |
1091 | /* |
1092 | * Please update the file | |
1093 | * Documentation/networking/mac80211-injection.txt | |
1094 | * when parsing new fields here. | |
1095 | */ | |
1096 | ||
e2ebc74d JB |
1097 | default: |
1098 | break; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
27004b10 | 1103 | return false; |
e2ebc74d JB |
1104 | |
1105 | /* | |
1106 | * remove the radiotap header | |
33e5a2f7 | 1107 | * iterator->_max_length was sanity-checked against |
e2ebc74d JB |
1108 | * skb->len by iterator init |
1109 | */ | |
33e5a2f7 | 1110 | skb_pull(skb, iterator._max_length); |
e2ebc74d | 1111 | |
27004b10 | 1112 | return true; |
e2ebc74d JB |
1113 | } |
1114 | ||
a622ab72 JB |
1115 | static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, |
1116 | struct sk_buff *skb, | |
1117 | struct ieee80211_tx_info *info, | |
1118 | struct tid_ampdu_tx *tid_tx, | |
1119 | int tid) | |
1120 | { | |
1121 | bool queued = false; | |
1122 | ||
1123 | if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { | |
1124 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
0ab33703 JB |
1125 | } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
1126 | /* | |
1127 | * nothing -- this aggregation session is being started | |
1128 | * but that might still fail with the driver | |
1129 | */ | |
a622ab72 JB |
1130 | } else { |
1131 | spin_lock(&tx->sta->lock); | |
1132 | /* | |
1133 | * Need to re-check now, because we may get here | |
1134 | * | |
1135 | * 1) in the window during which the setup is actually | |
1136 | * already done, but not marked yet because not all | |
1137 | * packets are spliced over to the driver pending | |
1138 | * queue yet -- if this happened we acquire the lock | |
1139 | * either before or after the splice happens, but | |
1140 | * need to recheck which of these cases happened. | |
1141 | * | |
1142 | * 2) during session teardown, if the OPERATIONAL bit | |
1143 | * was cleared due to the teardown but the pointer | |
1144 | * hasn't been assigned NULL yet (or we loaded it | |
1145 | * before it was assigned) -- in this case it may | |
1146 | * now be NULL which means we should just let the | |
1147 | * packet pass through because splicing the frames | |
1148 | * back is already done. | |
1149 | */ | |
1150 | tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; | |
1151 | ||
1152 | if (!tid_tx) { | |
1153 | /* do nothing, let packet pass through */ | |
1154 | } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { | |
1155 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
1156 | } else { | |
1157 | queued = true; | |
1158 | info->control.vif = &tx->sdata->vif; | |
1159 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1160 | __skb_queue_tail(&tid_tx->pending, skb); | |
1161 | } | |
1162 | spin_unlock(&tx->sta->lock); | |
1163 | } | |
1164 | ||
1165 | return queued; | |
1166 | } | |
1167 | ||
58d4185e JB |
1168 | /* |
1169 | * initialises @tx | |
1170 | */ | |
9ae54c84 | 1171 | static ieee80211_tx_result |
3b8d81e0 JB |
1172 | ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, |
1173 | struct ieee80211_tx_data *tx, | |
1174 | struct sk_buff *skb) | |
e2ebc74d | 1175 | { |
3b8d81e0 | 1176 | struct ieee80211_local *local = sdata->local; |
58d4185e | 1177 | struct ieee80211_hdr *hdr; |
e039fa4a | 1178 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8b30b1fe | 1179 | int hdrlen, tid; |
a622ab72 | 1180 | u8 *qc; |
e2ebc74d JB |
1181 | |
1182 | memset(tx, 0, sizeof(*tx)); | |
1183 | tx->skb = skb; | |
e2ebc74d | 1184 | tx->local = local; |
3b8d81e0 | 1185 | tx->sdata = sdata; |
e039fa4a | 1186 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 1187 | /* |
58d4185e JB |
1188 | * Set this flag (used below to indicate "automatic fragmentation"), |
1189 | * it will be cleared/left by radiotap as desired. | |
f23a4780 | 1190 | * Only valid when fragmentation is done by the stack. |
e2ebc74d | 1191 | */ |
f23a4780 AN |
1192 | if (!local->ops->set_frag_threshold) |
1193 | tx->flags |= IEEE80211_TX_FRAGMENTED; | |
e2ebc74d JB |
1194 | |
1195 | /* process and remove the injection radiotap header */ | |
17ad353b | 1196 | if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) { |
27004b10 | 1197 | if (!__ieee80211_parse_tx_radiotap(tx, skb)) |
9ae54c84 | 1198 | return TX_DROP; |
58d4185e | 1199 | |
e2ebc74d | 1200 | /* |
58d4185e JB |
1201 | * __ieee80211_parse_tx_radiotap has now removed |
1202 | * the radiotap header that was present and pre-filled | |
1203 | * 'tx' with tx control information. | |
e2ebc74d | 1204 | */ |
17ad353b | 1205 | info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP; |
e2ebc74d JB |
1206 | } |
1207 | ||
cd8ffc80 JB |
1208 | /* |
1209 | * If this flag is set to true anywhere, and we get here, | |
1210 | * we are doing the needed processing, so remove the flag | |
1211 | * now. | |
1212 | */ | |
1213 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1214 | ||
58d4185e JB |
1215 | hdr = (struct ieee80211_hdr *) skb->data; |
1216 | ||
3f0e0b22 | 1217 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
f14543ee | 1218 | tx->sta = rcu_dereference(sdata->u.vlan.sta); |
3f0e0b22 FF |
1219 | if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) |
1220 | return TX_DROP; | |
b4d57adb FF |
1221 | } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { |
1222 | tx->sta = sta_info_get_bss(sdata, hdr->addr1); | |
3f0e0b22 | 1223 | } |
f14543ee | 1224 | if (!tx->sta) |
abe60632 | 1225 | tx->sta = sta_info_get(sdata, hdr->addr1); |
58d4185e | 1226 | |
cd8ffc80 JB |
1227 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
1228 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { | |
cd8ffc80 JB |
1229 | struct tid_ampdu_tx *tid_tx; |
1230 | ||
8b30b1fe S |
1231 | qc = ieee80211_get_qos_ctl(hdr); |
1232 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1233 | ||
a622ab72 JB |
1234 | tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); |
1235 | if (tid_tx) { | |
1236 | bool queued; | |
cd8ffc80 | 1237 | |
a622ab72 JB |
1238 | queued = ieee80211_tx_prep_agg(tx, skb, info, |
1239 | tid_tx, tid); | |
1240 | ||
1241 | if (unlikely(queued)) | |
1242 | return TX_QUEUED; | |
1243 | } | |
8b30b1fe S |
1244 | } |
1245 | ||
badffb72 | 1246 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1247 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1248 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1249 | } else { |
5cf121c3 | 1250 | tx->flags |= IEEE80211_TX_UNICAST; |
d3707d99 JB |
1251 | if (unlikely(local->wifi_wme_noack_test)) |
1252 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1253 | else | |
1254 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; | |
badffb72 | 1255 | } |
58d4185e | 1256 | |
5cf121c3 JB |
1257 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1258 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
b9a5f8ca | 1259 | skb->len + FCS_LEN > local->hw.wiphy->frag_threshold && |
8d5e0d58 | 1260 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
5cf121c3 | 1261 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1262 | else |
5cf121c3 | 1263 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1264 | } |
1265 | ||
e2ebc74d | 1266 | if (!tx->sta) |
e039fa4a | 1267 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1268 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1269 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1270 | |
b73d70ad | 1271 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1272 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1273 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1274 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1275 | } | |
e039fa4a | 1276 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1277 | |
9ae54c84 | 1278 | return TX_CONTINUE; |
e2ebc74d JB |
1279 | } |
1280 | ||
2de8e0d9 | 1281 | static int __ieee80211_tx(struct ieee80211_local *local, |
1870cd71 | 1282 | struct sk_buff **skbp, |
3b8d81e0 JB |
1283 | struct sta_info *sta, |
1284 | bool txpending) | |
e2ebc74d | 1285 | { |
1870cd71 | 1286 | struct sk_buff *skb = *skbp, *next; |
f8e79ddd | 1287 | struct ieee80211_tx_info *info; |
5061b0c2 | 1288 | struct ieee80211_sub_if_data *sdata; |
3b8d81e0 | 1289 | unsigned long flags; |
a220858d | 1290 | int ret, len; |
2de8e0d9 | 1291 | bool fragm = false; |
e2ebc74d | 1292 | |
2de8e0d9 | 1293 | while (skb) { |
3b8d81e0 JB |
1294 | int q = skb_get_queue_mapping(skb); |
1295 | ||
1296 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
1297 | ret = IEEE80211_TX_OK; | |
1298 | if (local->queue_stop_reasons[q] || | |
1299 | (!txpending && !skb_queue_empty(&local->pending[q]))) | |
1300 | ret = IEEE80211_TX_PENDING; | |
1301 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
1302 | if (ret != IEEE80211_TX_OK) | |
1303 | return ret; | |
f8e79ddd | 1304 | |
f0e72851 JB |
1305 | info = IEEE80211_SKB_CB(skb); |
1306 | ||
1307 | if (fragm) | |
e6a9854b | 1308 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1309 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
f0e72851 | 1310 | |
2de8e0d9 | 1311 | next = skb->next; |
a220858d | 1312 | len = skb->len; |
5061b0c2 | 1313 | |
ad5351db JB |
1314 | if (next) |
1315 | info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; | |
1316 | ||
5061b0c2 JB |
1317 | sdata = vif_to_sdata(info->control.vif); |
1318 | ||
1319 | switch (sdata->vif.type) { | |
1320 | case NL80211_IFTYPE_MONITOR: | |
1321 | info->control.vif = NULL; | |
1322 | break; | |
1323 | case NL80211_IFTYPE_AP_VLAN: | |
1324 | info->control.vif = &container_of(sdata->bss, | |
1325 | struct ieee80211_sub_if_data, u.ap)->vif; | |
1326 | break; | |
1327 | default: | |
1328 | /* keep */ | |
1329 | break; | |
1330 | } | |
1331 | ||
ec25acc4 JB |
1332 | if (sta && sta->uploaded) |
1333 | info->control.sta = &sta->sta; | |
1334 | else | |
1335 | info->control.sta = NULL; | |
1336 | ||
24487981 | 1337 | ret = drv_tx(local, skb); |
a220858d JB |
1338 | if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { |
1339 | dev_kfree_skb(skb); | |
1340 | ret = NETDEV_TX_OK; | |
1341 | } | |
21f5fc75 LR |
1342 | if (ret != NETDEV_TX_OK) { |
1343 | info->control.vif = &sdata->vif; | |
2de8e0d9 | 1344 | return IEEE80211_TX_AGAIN; |
21f5fc75 LR |
1345 | } |
1346 | ||
1870cd71 | 1347 | *skbp = skb = next; |
2de8e0d9 JB |
1348 | ieee80211_led_tx(local, 1); |
1349 | fragm = true; | |
e2ebc74d | 1350 | } |
2de8e0d9 | 1351 | |
e2ebc74d JB |
1352 | return IEEE80211_TX_OK; |
1353 | } | |
1354 | ||
97b045d6 JB |
1355 | /* |
1356 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1357 | * frame was dropped or queued. | |
1358 | */ | |
1359 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1360 | { | |
97b045d6 | 1361 | struct sk_buff *skb = tx->skb; |
c6fcf6bc | 1362 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
97b045d6 | 1363 | ieee80211_tx_result res = TX_DROP; |
97b045d6 | 1364 | |
9aa4aee3 JB |
1365 | #define CALL_TXH(txh) \ |
1366 | do { \ | |
1367 | res = txh(tx); \ | |
1368 | if (res != TX_CONTINUE) \ | |
1369 | goto txh_done; \ | |
1370 | } while (0) | |
1371 | ||
5c1b98a5 | 1372 | CALL_TXH(ieee80211_tx_h_dynamic_ps); |
9aa4aee3 JB |
1373 | CALL_TXH(ieee80211_tx_h_check_assoc); |
1374 | CALL_TXH(ieee80211_tx_h_ps_buf); | |
a621fa4d | 1375 | CALL_TXH(ieee80211_tx_h_check_control_port_protocol); |
9aa4aee3 | 1376 | CALL_TXH(ieee80211_tx_h_select_key); |
af65cd96 JB |
1377 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) |
1378 | CALL_TXH(ieee80211_tx_h_rate_ctrl); | |
c6fcf6bc JB |
1379 | |
1380 | if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) | |
1381 | goto txh_done; | |
1382 | ||
1383 | CALL_TXH(ieee80211_tx_h_michael_mic_add); | |
9aa4aee3 JB |
1384 | CALL_TXH(ieee80211_tx_h_sequence); |
1385 | CALL_TXH(ieee80211_tx_h_fragment); | |
d9e8a70f | 1386 | /* handlers after fragment must be aware of tx info fragmentation! */ |
9aa4aee3 JB |
1387 | CALL_TXH(ieee80211_tx_h_stats); |
1388 | CALL_TXH(ieee80211_tx_h_encrypt); | |
1389 | CALL_TXH(ieee80211_tx_h_calculate_duration); | |
d9e8a70f | 1390 | #undef CALL_TXH |
97b045d6 | 1391 | |
d9e8a70f | 1392 | txh_done: |
97b045d6 | 1393 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1394 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
2de8e0d9 JB |
1395 | while (skb) { |
1396 | struct sk_buff *next; | |
1397 | ||
1398 | next = skb->next; | |
1399 | dev_kfree_skb(skb); | |
1400 | skb = next; | |
1401 | } | |
97b045d6 JB |
1402 | return -1; |
1403 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1404 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1405 | return -1; |
1406 | } | |
1407 | ||
1408 | return 0; | |
1409 | } | |
1410 | ||
3b8d81e0 JB |
1411 | static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, |
1412 | struct sk_buff *skb, bool txpending) | |
e2ebc74d | 1413 | { |
3b8d81e0 | 1414 | struct ieee80211_local *local = sdata->local; |
5cf121c3 | 1415 | struct ieee80211_tx_data tx; |
97b045d6 | 1416 | ieee80211_tx_result res_prepare; |
e039fa4a | 1417 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2a577d98 JB |
1418 | struct sk_buff *next; |
1419 | unsigned long flags; | |
1420 | int ret, retries; | |
e2530083 | 1421 | u16 queue; |
e2ebc74d | 1422 | |
e2530083 JB |
1423 | queue = skb_get_queue_mapping(skb); |
1424 | ||
e2ebc74d JB |
1425 | if (unlikely(skb->len < 10)) { |
1426 | dev_kfree_skb(skb); | |
cd8ffc80 | 1427 | return; |
e2ebc74d JB |
1428 | } |
1429 | ||
d0709a65 JB |
1430 | rcu_read_lock(); |
1431 | ||
58d4185e | 1432 | /* initialises tx */ |
3b8d81e0 | 1433 | res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); |
e2ebc74d | 1434 | |
cd8ffc80 | 1435 | if (unlikely(res_prepare == TX_DROP)) { |
e2ebc74d | 1436 | dev_kfree_skb(skb); |
d0709a65 | 1437 | rcu_read_unlock(); |
cd8ffc80 JB |
1438 | return; |
1439 | } else if (unlikely(res_prepare == TX_QUEUED)) { | |
1440 | rcu_read_unlock(); | |
1441 | return; | |
e2ebc74d JB |
1442 | } |
1443 | ||
5cf121c3 | 1444 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1445 | info->band = tx.channel->band; |
e2ebc74d | 1446 | |
97b045d6 JB |
1447 | if (invoke_tx_handlers(&tx)) |
1448 | goto out; | |
e2ebc74d | 1449 | |
2a577d98 JB |
1450 | retries = 0; |
1451 | retry: | |
3b8d81e0 | 1452 | ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); |
2a577d98 JB |
1453 | switch (ret) { |
1454 | case IEEE80211_TX_OK: | |
1455 | break; | |
1456 | case IEEE80211_TX_AGAIN: | |
eefce91a JB |
1457 | /* |
1458 | * Since there are no fragmented frames on A-MPDU | |
1459 | * queues, there's no reason for a driver to reject | |
1460 | * a frame there, warn and drop it. | |
1461 | */ | |
2a577d98 JB |
1462 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
1463 | goto drop; | |
1464 | /* fall through */ | |
1465 | case IEEE80211_TX_PENDING: | |
1466 | skb = tx.skb; | |
eefce91a | 1467 | |
2a577d98 | 1468 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
e2ebc74d | 1469 | |
3b8d81e0 JB |
1470 | if (local->queue_stop_reasons[queue] || |
1471 | !skb_queue_empty(&local->pending[queue])) { | |
1472 | /* | |
1473 | * if queue is stopped, queue up frames for later | |
1474 | * transmission from the tasklet | |
1475 | */ | |
2a577d98 JB |
1476 | do { |
1477 | next = skb->next; | |
1478 | skb->next = NULL; | |
cd8ffc80 | 1479 | if (unlikely(txpending)) |
3b8d81e0 JB |
1480 | __skb_queue_head(&local->pending[queue], |
1481 | skb); | |
cd8ffc80 | 1482 | else |
3b8d81e0 JB |
1483 | __skb_queue_tail(&local->pending[queue], |
1484 | skb); | |
2a577d98 JB |
1485 | } while ((skb = next)); |
1486 | ||
2a577d98 JB |
1487 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1488 | flags); | |
1489 | } else { | |
3b8d81e0 JB |
1490 | /* |
1491 | * otherwise retry, but this is a race condition or | |
1492 | * a driver bug (which we warn about if it persists) | |
1493 | */ | |
2a577d98 JB |
1494 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1495 | flags); | |
1496 | ||
1497 | retries++; | |
3b8d81e0 | 1498 | if (WARN(retries > 10, "tx refused but queue active\n")) |
2a577d98 | 1499 | goto drop; |
e2ebc74d JB |
1500 | goto retry; |
1501 | } | |
e2ebc74d | 1502 | } |
97b045d6 | 1503 | out: |
d4e46a3d | 1504 | rcu_read_unlock(); |
cd8ffc80 | 1505 | return; |
e2ebc74d JB |
1506 | |
1507 | drop: | |
d4e46a3d | 1508 | rcu_read_unlock(); |
2de8e0d9 JB |
1509 | |
1510 | skb = tx.skb; | |
1511 | while (skb) { | |
2de8e0d9 JB |
1512 | next = skb->next; |
1513 | dev_kfree_skb(skb); | |
1514 | skb = next; | |
1515 | } | |
e2ebc74d JB |
1516 | } |
1517 | ||
1518 | /* device xmit handlers */ | |
1519 | ||
23c0752a JB |
1520 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1521 | struct sk_buff *skb, | |
1522 | int head_need, bool may_encrypt) | |
1523 | { | |
1524 | int tail_need = 0; | |
1525 | ||
1526 | /* | |
1527 | * This could be optimised, devices that do full hardware | |
1528 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1529 | * have no drivers for such devices currently. | |
1530 | */ | |
1531 | if (may_encrypt) { | |
1532 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1533 | tail_need -= skb_tailroom(skb); | |
1534 | tail_need = max_t(int, tail_need, 0); | |
1535 | } | |
1536 | ||
1537 | if (head_need || tail_need) { | |
1538 | /* Sorry. Can't account for this any more */ | |
1539 | skb_orphan(skb); | |
1540 | } | |
1541 | ||
1542 | if (skb_header_cloned(skb)) | |
1543 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1544 | else | |
1545 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1546 | ||
1547 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
0fb9a9ec JP |
1548 | wiphy_debug(local->hw.wiphy, |
1549 | "failed to reallocate TX buffer\n"); | |
23c0752a JB |
1550 | return -ENOMEM; |
1551 | } | |
1552 | ||
1553 | /* update truesize too */ | |
1554 | skb->truesize += head_need + tail_need; | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
3b8d81e0 JB |
1559 | static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, |
1560 | struct sk_buff *skb) | |
e2ebc74d | 1561 | { |
3b8d81e0 | 1562 | struct ieee80211_local *local = sdata->local; |
e039fa4a | 1563 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1564 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
3b8d81e0 | 1565 | struct ieee80211_sub_if_data *tmp_sdata; |
e2ebc74d | 1566 | int headroom; |
23c0752a | 1567 | bool may_encrypt; |
e2ebc74d | 1568 | |
d84f3234 JB |
1569 | rcu_read_lock(); |
1570 | ||
cca89496 | 1571 | if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
25d834e1 JB |
1572 | int hdrlen; |
1573 | u16 len_rthdr; | |
1574 | ||
17ad353b FF |
1575 | info->flags |= IEEE80211_TX_CTL_INJECTED | |
1576 | IEEE80211_TX_INTFL_HAS_RADIOTAP; | |
25d834e1 JB |
1577 | |
1578 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
8ef86c7b | 1579 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); |
25d834e1 JB |
1580 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
1581 | ||
1582 | /* check the header is complete in the frame */ | |
1583 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1584 | /* | |
1585 | * We process outgoing injected frames that have a | |
1586 | * local address we handle as though they are our | |
1587 | * own frames. | |
1588 | * This code here isn't entirely correct, the local | |
1589 | * MAC address is not necessarily enough to find | |
1590 | * the interface to use; for that proper VLAN/WDS | |
1591 | * support we will need a different mechanism. | |
1592 | */ | |
1593 | ||
3b8d81e0 | 1594 | list_for_each_entry_rcu(tmp_sdata, &local->interfaces, |
25d834e1 | 1595 | list) { |
9607e6b6 | 1596 | if (!ieee80211_sdata_running(tmp_sdata)) |
25d834e1 | 1597 | continue; |
7dff3125 JM |
1598 | if (tmp_sdata->vif.type == |
1599 | NL80211_IFTYPE_MONITOR || | |
1600 | tmp_sdata->vif.type == | |
1601 | NL80211_IFTYPE_AP_VLAN || | |
1602 | tmp_sdata->vif.type == | |
1603 | NL80211_IFTYPE_WDS) | |
f1b33cb1 | 1604 | continue; |
47846c9b | 1605 | if (compare_ether_addr(tmp_sdata->vif.addr, |
9b1ce526 | 1606 | hdr->addr2) == 0) { |
3b8d81e0 | 1607 | sdata = tmp_sdata; |
25d834e1 JB |
1608 | break; |
1609 | } | |
1610 | } | |
25d834e1 | 1611 | } |
e32f85f7 LCC |
1612 | } |
1613 | ||
3b8d81e0 | 1614 | may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); |
23c0752a | 1615 | |
3b8d81e0 | 1616 | headroom = local->tx_headroom; |
23c0752a JB |
1617 | if (may_encrypt) |
1618 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1619 | headroom -= skb_headroom(skb); | |
1620 | headroom = max_t(int, 0, headroom); | |
1621 | ||
3b8d81e0 | 1622 | if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) { |
23c0752a | 1623 | dev_kfree_skb(skb); |
d84f3234 | 1624 | rcu_read_unlock(); |
3b8d81e0 | 1625 | return; |
e2ebc74d JB |
1626 | } |
1627 | ||
740c1aa3 | 1628 | hdr = (struct ieee80211_hdr *) skb->data; |
5061b0c2 | 1629 | info->control.vif = &sdata->vif; |
e2ebc74d | 1630 | |
cca89496 JC |
1631 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
1632 | ieee80211_is_data(hdr->frame_control) && | |
1633 | !is_multicast_ether_addr(hdr->addr1)) | |
1634 | if (mesh_nexthop_lookup(skb, sdata)) { | |
1635 | /* skb queued: don't free */ | |
d84f3234 | 1636 | rcu_read_unlock(); |
cca89496 JC |
1637 | return; |
1638 | } | |
1639 | ||
cf0277e7 | 1640 | ieee80211_set_qos_hdr(local, skb); |
3b8d81e0 | 1641 | ieee80211_tx(sdata, skb, false); |
d84f3234 | 1642 | rcu_read_unlock(); |
e2ebc74d JB |
1643 | } |
1644 | ||
d0cf9c0d SH |
1645 | netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, |
1646 | struct net_device *dev) | |
e2ebc74d JB |
1647 | { |
1648 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
47f4d887 | 1649 | struct ieee80211_channel *chan = local->hw.conf.channel; |
e2ebc74d JB |
1650 | struct ieee80211_radiotap_header *prthdr = |
1651 | (struct ieee80211_radiotap_header *)skb->data; | |
3b8d81e0 | 1652 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
9b8a74e3 | 1653 | u16 len_rthdr; |
e2ebc74d | 1654 | |
47f4d887 LR |
1655 | /* |
1656 | * Frame injection is not allowed if beaconing is not allowed | |
1657 | * or if we need radar detection. Beaconing is usually not allowed when | |
1658 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1659 | * Passive scan is also used in world regulatory domains where | |
1660 | * your country is not known and as such it should be treated as | |
1661 | * NO TX unless the channel is explicitly allowed in which case | |
1662 | * your current regulatory domain would not have the passive scan | |
1663 | * flag. | |
1664 | * | |
1665 | * Since AP mode uses monitor interfaces to inject/TX management | |
1666 | * frames we can make AP mode the exception to this rule once it | |
1667 | * supports radar detection as its implementation can deal with | |
1668 | * radar detection by itself. We can do that later by adding a | |
1669 | * monitor flag interfaces used for AP support. | |
1670 | */ | |
1671 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | | |
1672 | IEEE80211_CHAN_PASSIVE_SCAN))) | |
1673 | goto fail; | |
1674 | ||
9b8a74e3 AG |
1675 | /* check for not even having the fixed radiotap header part */ |
1676 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1677 | goto fail; /* too short to be possibly valid */ | |
1678 | ||
1679 | /* is it a header version we can trust to find length from? */ | |
1680 | if (unlikely(prthdr->it_version)) | |
1681 | goto fail; /* only version 0 is supported */ | |
1682 | ||
1683 | /* then there must be a radiotap header with a length we can use */ | |
1684 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1685 | ||
1686 | /* does the skb contain enough to deliver on the alleged length? */ | |
1687 | if (unlikely(skb->len < len_rthdr)) | |
1688 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d | 1689 | |
e2ebc74d JB |
1690 | /* |
1691 | * fix up the pointers accounting for the radiotap | |
1692 | * header still being in there. We are being given | |
1693 | * a precooked IEEE80211 header so no need for | |
1694 | * normal processing | |
1695 | */ | |
9b8a74e3 | 1696 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1697 | /* |
9b8a74e3 AG |
1698 | * these are just fixed to the end of the rt area since we |
1699 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1700 | */ |
9b8a74e3 AG |
1701 | skb_set_network_header(skb, len_rthdr); |
1702 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1703 | |
3b8d81e0 JB |
1704 | memset(info, 0, sizeof(*info)); |
1705 | ||
7351c6bd JB |
1706 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
1707 | ||
3b8d81e0 JB |
1708 | /* pass the radiotap header up to xmit */ |
1709 | ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb); | |
e2ebc74d | 1710 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1711 | |
1712 | fail: | |
1713 | dev_kfree_skb(skb); | |
1714 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1715 | } |
1716 | ||
1717 | /** | |
1718 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1719 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1720 | * @skb: packet to be sent | |
1721 | * @dev: incoming interface | |
1722 | * | |
1723 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1724 | * not be freed, and caller is responsible for either retrying later or freeing | |
1725 | * skb). | |
1726 | * | |
1727 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1728 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1729 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1730 | * transmission (through low-level driver). | |
1731 | */ | |
d0cf9c0d SH |
1732 | netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, |
1733 | struct net_device *dev) | |
e2ebc74d | 1734 | { |
133b8226 JB |
1735 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1736 | struct ieee80211_local *local = sdata->local; | |
3b8d81e0 | 1737 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
5b548140 | 1738 | int ret = NETDEV_TX_BUSY, head_need; |
065e9605 HH |
1739 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1740 | __le16 fc; | |
e2ebc74d | 1741 | struct ieee80211_hdr hdr; |
ff67bb86 | 1742 | struct ieee80211s_hdr mesh_hdr __maybe_unused; |
e2ebc74d JB |
1743 | const u8 *encaps_data; |
1744 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1745 | int nh_pos, h_pos; |
f14543ee | 1746 | struct sta_info *sta = NULL; |
ce3edf6d | 1747 | u32 sta_flags = 0; |
e2ebc74d | 1748 | |
e2ebc74d | 1749 | if (unlikely(skb->len < ETH_HLEN)) { |
ec634fe3 | 1750 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1751 | goto fail; |
1752 | } | |
1753 | ||
1754 | nh_pos = skb_network_header(skb) - skb->data; | |
1755 | h_pos = skb_transport_header(skb) - skb->data; | |
1756 | ||
1757 | /* convert Ethernet header to proper 802.11 header (based on | |
1758 | * operation mode) */ | |
1759 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1760 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1761 | |
51fb61e7 | 1762 | switch (sdata->vif.type) { |
05c914fe | 1763 | case NL80211_IFTYPE_AP_VLAN: |
f14543ee | 1764 | rcu_read_lock(); |
9bc383de | 1765 | sta = rcu_dereference(sdata->u.vlan.sta); |
f14543ee FF |
1766 | if (sta) { |
1767 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); | |
1768 | /* RA TA DA SA */ | |
1769 | memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); | |
47846c9b | 1770 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
f14543ee FF |
1771 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1772 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1773 | hdrlen = 30; | |
1774 | sta_flags = get_sta_flags(sta); | |
1775 | } | |
1776 | rcu_read_unlock(); | |
1777 | if (sta) | |
1778 | break; | |
1779 | /* fall through */ | |
1780 | case NL80211_IFTYPE_AP: | |
065e9605 | 1781 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1782 | /* DA BSSID SA */ |
1783 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
47846c9b | 1784 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
e2ebc74d JB |
1785 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); |
1786 | hdrlen = 24; | |
cf966838 | 1787 | break; |
05c914fe | 1788 | case NL80211_IFTYPE_WDS: |
065e9605 | 1789 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1790 | /* RA TA DA SA */ |
1791 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
47846c9b | 1792 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
e2ebc74d JB |
1793 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1794 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1795 | hdrlen = 30; | |
cf966838 | 1796 | break; |
33b64eb2 | 1797 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1798 | case NL80211_IFTYPE_MESH_POINT: |
472dbc45 | 1799 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1800 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1801 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
ec634fe3 | 1802 | ret = NETDEV_TX_OK; |
e32f85f7 | 1803 | goto fail; |
33b64eb2 | 1804 | } |
79617dee | 1805 | |
47846c9b JB |
1806 | if (compare_ether_addr(sdata->vif.addr, |
1807 | skb->data + ETH_ALEN) == 0) { | |
3c5772a5 JC |
1808 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1809 | skb->data, skb->data + ETH_ALEN); | |
1810 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
1811 | sdata, NULL, NULL, NULL); | |
79617dee Y |
1812 | } else { |
1813 | /* packet from other interface */ | |
1814 | struct mesh_path *mppath; | |
3c5772a5 | 1815 | int is_mesh_mcast = 1; |
15ff6365 | 1816 | const u8 *mesh_da; |
79617dee | 1817 | |
3c5772a5 | 1818 | rcu_read_lock(); |
79617dee | 1819 | if (is_multicast_ether_addr(skb->data)) |
3c5772a5 JC |
1820 | /* DA TA mSA AE:SA */ |
1821 | mesh_da = skb->data; | |
79617dee | 1822 | else { |
15ff6365 JB |
1823 | static const u8 bcast[ETH_ALEN] = |
1824 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
1825 | ||
79617dee | 1826 | mppath = mpp_path_lookup(skb->data, sdata); |
3c5772a5 JC |
1827 | if (mppath) { |
1828 | /* RA TA mDA mSA AE:DA SA */ | |
1829 | mesh_da = mppath->mpp; | |
1830 | is_mesh_mcast = 0; | |
15ff6365 | 1831 | } else { |
3c5772a5 | 1832 | /* DA TA mSA AE:SA */ |
15ff6365 JB |
1833 | mesh_da = bcast; |
1834 | } | |
79617dee | 1835 | } |
3c5772a5 | 1836 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
47846c9b | 1837 | mesh_da, sdata->vif.addr); |
3c5772a5 JC |
1838 | rcu_read_unlock(); |
1839 | if (is_mesh_mcast) | |
1840 | meshhdrlen = | |
1841 | ieee80211_new_mesh_header(&mesh_hdr, | |
1842 | sdata, | |
1843 | skb->data + ETH_ALEN, | |
1844 | NULL, | |
1845 | NULL); | |
1846 | else | |
1847 | meshhdrlen = | |
1848 | ieee80211_new_mesh_header(&mesh_hdr, | |
1849 | sdata, | |
1850 | NULL, | |
1851 | skb->data, | |
1852 | skb->data + ETH_ALEN); | |
79617dee | 1853 | |
79617dee | 1854 | } |
33b64eb2 LCC |
1855 | break; |
1856 | #endif | |
05c914fe | 1857 | case NL80211_IFTYPE_STATION: |
46900298 | 1858 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
a621fa4d JB |
1859 | if (sdata->u.mgd.use_4addr && |
1860 | cpu_to_be16(ethertype) != sdata->control_port_protocol) { | |
f14543ee FF |
1861 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
1862 | /* RA TA DA SA */ | |
47846c9b | 1863 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
f14543ee FF |
1864 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1865 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1866 | hdrlen = 30; | |
1867 | } else { | |
1868 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); | |
1869 | /* BSSID SA DA */ | |
1870 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1871 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1872 | hdrlen = 24; | |
1873 | } | |
cf966838 | 1874 | break; |
05c914fe | 1875 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1876 | /* DA SA BSSID */ |
1877 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1878 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
46900298 | 1879 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
e2ebc74d | 1880 | hdrlen = 24; |
cf966838 JB |
1881 | break; |
1882 | default: | |
ec634fe3 | 1883 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1884 | goto fail; |
1885 | } | |
1886 | ||
7d185b8b JB |
1887 | /* |
1888 | * There's no need to try to look up the destination | |
1889 | * if it is a multicast address (which can only happen | |
1890 | * in AP mode) | |
1891 | */ | |
1892 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1893 | rcu_read_lock(); |
abe60632 JB |
1894 | sta = sta_info_get(sdata, hdr.addr1); |
1895 | if (sta) | |
07346f81 | 1896 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1897 | rcu_read_unlock(); |
e2ebc74d JB |
1898 | } |
1899 | ||
3434fbd3 | 1900 | /* receiver and we are QoS enabled, use a QoS type frame */ |
176be728 | 1901 | if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { |
065e9605 | 1902 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1903 | hdrlen += 2; |
1904 | } | |
1905 | ||
1906 | /* | |
238814fd JB |
1907 | * Drop unicast frames to unauthorised stations unless they are |
1908 | * EAPOL frames from the local station. | |
ce3edf6d | 1909 | */ |
e32f85f7 LCC |
1910 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1911 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 | 1912 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
a621fa4d | 1913 | !(cpu_to_be16(ethertype) == sdata->control_port_protocol && |
47846c9b | 1914 | compare_ether_addr(sdata->vif.addr, |
ce3edf6d JB |
1915 | skb->data + ETH_ALEN) == 0))) { |
1916 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1917 | if (net_ratelimit()) |
0c68ae26 | 1918 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1919 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1920 | hdr.addr1); |
ce3edf6d JB |
1921 | #endif |
1922 | ||
1923 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1924 | ||
ec634fe3 | 1925 | ret = NETDEV_TX_OK; |
ce3edf6d JB |
1926 | goto fail; |
1927 | } | |
1928 | ||
065e9605 | 1929 | hdr.frame_control = fc; |
e2ebc74d JB |
1930 | hdr.duration_id = 0; |
1931 | hdr.seq_ctrl = 0; | |
1932 | ||
1933 | skip_header_bytes = ETH_HLEN; | |
1934 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1935 | encaps_data = bridge_tunnel_header; | |
1936 | encaps_len = sizeof(bridge_tunnel_header); | |
1937 | skip_header_bytes -= 2; | |
1938 | } else if (ethertype >= 0x600) { | |
1939 | encaps_data = rfc1042_header; | |
1940 | encaps_len = sizeof(rfc1042_header); | |
1941 | skip_header_bytes -= 2; | |
1942 | } else { | |
1943 | encaps_data = NULL; | |
1944 | encaps_len = 0; | |
1945 | } | |
1946 | ||
1947 | skb_pull(skb, skip_header_bytes); | |
1948 | nh_pos -= skip_header_bytes; | |
1949 | h_pos -= skip_header_bytes; | |
1950 | ||
23c0752a | 1951 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1952 | |
23c0752a JB |
1953 | /* |
1954 | * So we need to modify the skb header and hence need a copy of | |
1955 | * that. The head_need variable above doesn't, so far, include | |
1956 | * the needed header space that we don't need right away. If we | |
1957 | * can, then we don't reallocate right now but only after the | |
1958 | * frame arrives at the master device (if it does...) | |
1959 | * | |
1960 | * If we cannot, however, then we will reallocate to include all | |
1961 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1962 | * make it big enough for everything we may ever need. | |
1963 | */ | |
e2ebc74d | 1964 | |
3a5be7d4 | 1965 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1966 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1967 | head_need += local->tx_headroom; | |
1968 | head_need = max_t(int, 0, head_need); | |
1969 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1970 | goto fail; |
e2ebc74d JB |
1971 | } |
1972 | ||
1973 | if (encaps_data) { | |
1974 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1975 | nh_pos += encaps_len; | |
1976 | h_pos += encaps_len; | |
1977 | } | |
c29b9b9b | 1978 | |
e4ab7eb0 | 1979 | #ifdef CONFIG_MAC80211_MESH |
33b64eb2 LCC |
1980 | if (meshhdrlen > 0) { |
1981 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1982 | nh_pos += meshhdrlen; | |
1983 | h_pos += meshhdrlen; | |
1984 | } | |
e4ab7eb0 | 1985 | #endif |
33b64eb2 | 1986 | |
065e9605 | 1987 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1988 | __le16 *qos_control; |
1989 | ||
1990 | qos_control = (__le16*) skb_push(skb, 2); | |
1991 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1992 | /* | |
1993 | * Maybe we could actually set some fields here, for now just | |
1994 | * initialise to zero to indicate no special operation. | |
1995 | */ | |
1996 | *qos_control = 0; | |
1997 | } else | |
1998 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1999 | ||
e2ebc74d JB |
2000 | nh_pos += hdrlen; |
2001 | h_pos += hdrlen; | |
2002 | ||
68aae116 SH |
2003 | dev->stats.tx_packets++; |
2004 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
2005 | |
2006 | /* Update skb pointers to various headers since this modified frame | |
2007 | * is going to go through Linux networking code that may potentially | |
2008 | * need things like pointer to IP header. */ | |
2009 | skb_set_mac_header(skb, 0); | |
2010 | skb_set_network_header(skb, nh_pos); | |
2011 | skb_set_transport_header(skb, h_pos); | |
2012 | ||
3b8d81e0 JB |
2013 | memset(info, 0, sizeof(*info)); |
2014 | ||
e2ebc74d | 2015 | dev->trans_start = jiffies; |
3b8d81e0 | 2016 | ieee80211_xmit(sdata, skb); |
e2ebc74d | 2017 | |
ec634fe3 | 2018 | return NETDEV_TX_OK; |
e2ebc74d JB |
2019 | |
2020 | fail: | |
ec634fe3 | 2021 | if (ret == NETDEV_TX_OK) |
e2ebc74d JB |
2022 | dev_kfree_skb(skb); |
2023 | ||
2024 | return ret; | |
2025 | } | |
2026 | ||
e2ebc74d | 2027 | |
e2530083 JB |
2028 | /* |
2029 | * ieee80211_clear_tx_pending may not be called in a context where | |
2030 | * it is possible that it packets could come in again. | |
2031 | */ | |
e2ebc74d JB |
2032 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
2033 | { | |
2de8e0d9 | 2034 | int i; |
e2ebc74d | 2035 | |
2a577d98 JB |
2036 | for (i = 0; i < local->hw.queues; i++) |
2037 | skb_queue_purge(&local->pending[i]); | |
e2ebc74d JB |
2038 | } |
2039 | ||
cd8ffc80 JB |
2040 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
2041 | struct sk_buff *skb) | |
2042 | { | |
2043 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2044 | struct ieee80211_sub_if_data *sdata; | |
2045 | struct sta_info *sta; | |
2046 | struct ieee80211_hdr *hdr; | |
cd8ffc80 JB |
2047 | int ret; |
2048 | bool result = true; | |
2049 | ||
5061b0c2 | 2050 | sdata = vif_to_sdata(info->control.vif); |
cd8ffc80 JB |
2051 | |
2052 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { | |
5061b0c2 | 2053 | ieee80211_tx(sdata, skb, true); |
cd8ffc80 JB |
2054 | } else { |
2055 | hdr = (struct ieee80211_hdr *)skb->data; | |
abe60632 | 2056 | sta = sta_info_get(sdata, hdr->addr1); |
cd8ffc80 | 2057 | |
3b8d81e0 | 2058 | ret = __ieee80211_tx(local, &skb, sta, true); |
cd8ffc80 JB |
2059 | if (ret != IEEE80211_TX_OK) |
2060 | result = false; | |
2061 | } | |
2062 | ||
cd8ffc80 JB |
2063 | return result; |
2064 | } | |
2065 | ||
e2530083 | 2066 | /* |
3b8d81e0 | 2067 | * Transmit all pending packets. Called from tasklet. |
e2530083 | 2068 | */ |
e2ebc74d JB |
2069 | void ieee80211_tx_pending(unsigned long data) |
2070 | { | |
2071 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
7236fe29 | 2072 | struct ieee80211_sub_if_data *sdata; |
2a577d98 | 2073 | unsigned long flags; |
cd8ffc80 | 2074 | int i; |
3b8d81e0 | 2075 | bool txok; |
e2ebc74d | 2076 | |
f0e72851 | 2077 | rcu_read_lock(); |
e2530083 | 2078 | |
3b8d81e0 | 2079 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
2a577d98 JB |
2080 | for (i = 0; i < local->hw.queues; i++) { |
2081 | /* | |
2082 | * If queue is stopped by something other than due to pending | |
2083 | * frames, or we have no pending frames, proceed to next queue. | |
2084 | */ | |
3b8d81e0 | 2085 | if (local->queue_stop_reasons[i] || |
2a577d98 | 2086 | skb_queue_empty(&local->pending[i])) |
e2ebc74d | 2087 | continue; |
e2530083 | 2088 | |
2a577d98 | 2089 | while (!skb_queue_empty(&local->pending[i])) { |
3b8d81e0 | 2090 | struct sk_buff *skb = __skb_dequeue(&local->pending[i]); |
5061b0c2 | 2091 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
5061b0c2 | 2092 | |
a7bc376c JB |
2093 | if (WARN_ON(!info->control.vif)) { |
2094 | kfree_skb(skb); | |
2095 | continue; | |
2096 | } | |
2097 | ||
3b8d81e0 JB |
2098 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
2099 | flags); | |
2100 | ||
2101 | txok = ieee80211_tx_pending_skb(local, skb); | |
2102 | if (!txok) | |
2103 | __skb_queue_head(&local->pending[i], skb); | |
2104 | spin_lock_irqsave(&local->queue_stop_reason_lock, | |
2105 | flags); | |
2106 | if (!txok) | |
2a577d98 | 2107 | break; |
e2ebc74d | 2108 | } |
7236fe29 JB |
2109 | |
2110 | if (skb_queue_empty(&local->pending[i])) | |
2111 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
2337db8d | 2112 | netif_wake_subqueue(sdata->dev, i); |
e2ebc74d | 2113 | } |
3b8d81e0 | 2114 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
2a577d98 | 2115 | |
f0e72851 | 2116 | rcu_read_unlock(); |
e2ebc74d JB |
2117 | } |
2118 | ||
2119 | /* functions for drivers to get certain frames */ | |
2120 | ||
8e7be8da | 2121 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
2122 | struct sk_buff *skb, |
2123 | struct beacon_data *beacon) | |
e2ebc74d JB |
2124 | { |
2125 | u8 *pos, *tim; | |
2126 | int aid0 = 0; | |
2127 | int i, have_bits = 0, n1, n2; | |
2128 | ||
2129 | /* Generate bitmap for TIM only if there are any STAs in power save | |
2130 | * mode. */ | |
e2ebc74d JB |
2131 | if (atomic_read(&bss->num_sta_ps) > 0) |
2132 | /* in the hope that this is faster than | |
2133 | * checking byte-for-byte */ | |
2134 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
2135 | IEEE80211_MAX_AID+1); | |
2136 | ||
2137 | if (bss->dtim_count == 0) | |
5dfdaf58 | 2138 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
2139 | else |
2140 | bss->dtim_count--; | |
2141 | ||
2142 | tim = pos = (u8 *) skb_put(skb, 6); | |
2143 | *pos++ = WLAN_EID_TIM; | |
2144 | *pos++ = 4; | |
2145 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 2146 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
2147 | |
2148 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
2149 | aid0 = 1; | |
2150 | ||
2151 | if (have_bits) { | |
2152 | /* Find largest even number N1 so that bits numbered 1 through | |
2153 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
2154 | * (N2 + 1) x 8 through 2007 are 0. */ | |
2155 | n1 = 0; | |
2156 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
2157 | if (bss->tim[i]) { | |
2158 | n1 = i & 0xfe; | |
2159 | break; | |
2160 | } | |
2161 | } | |
2162 | n2 = n1; | |
2163 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
2164 | if (bss->tim[i]) { | |
2165 | n2 = i; | |
2166 | break; | |
2167 | } | |
2168 | } | |
2169 | ||
2170 | /* Bitmap control */ | |
2171 | *pos++ = n1 | aid0; | |
2172 | /* Part Virt Bitmap */ | |
2173 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
2174 | ||
2175 | tim[1] = n2 - n1 + 4; | |
2176 | skb_put(skb, n2 - n1); | |
2177 | } else { | |
2178 | *pos++ = aid0; /* Bitmap control */ | |
2179 | *pos++ = 0; /* Part Virt Bitmap */ | |
2180 | } | |
e2ebc74d JB |
2181 | } |
2182 | ||
eddcbb94 JB |
2183 | struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, |
2184 | struct ieee80211_vif *vif, | |
2185 | u16 *tim_offset, u16 *tim_length) | |
e2ebc74d JB |
2186 | { |
2187 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 2188 | struct sk_buff *skb = NULL; |
e039fa4a | 2189 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
2190 | struct ieee80211_sub_if_data *sdata = NULL; |
2191 | struct ieee80211_if_ap *ap = NULL; | |
5dfdaf58 | 2192 | struct beacon_data *beacon; |
8318d78a | 2193 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 2194 | enum ieee80211_band band = local->hw.conf.channel->band; |
e00cfce0 | 2195 | struct ieee80211_tx_rate_control txrc; |
8318d78a | 2196 | |
2e92e6f2 | 2197 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
2198 | |
2199 | rcu_read_lock(); | |
e2ebc74d | 2200 | |
32bfd35d | 2201 | sdata = vif_to_sdata(vif); |
e2ebc74d | 2202 | |
eddcbb94 JB |
2203 | if (tim_offset) |
2204 | *tim_offset = 0; | |
2205 | if (tim_length) | |
2206 | *tim_length = 0; | |
2207 | ||
05c914fe | 2208 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
2209 | ap = &sdata->u.ap; |
2210 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
2211 | if (ap && beacon) { |
2212 | /* | |
2213 | * headroom, head length, | |
2214 | * tail length and maximum TIM length | |
2215 | */ | |
2216 | skb = dev_alloc_skb(local->tx_headroom + | |
2217 | beacon->head_len + | |
2218 | beacon->tail_len + 256); | |
2219 | if (!skb) | |
2220 | goto out; | |
33b64eb2 | 2221 | |
902acc78 JB |
2222 | skb_reserve(skb, local->tx_headroom); |
2223 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
2224 | beacon->head_len); | |
33b64eb2 | 2225 | |
d0709a65 JB |
2226 | /* |
2227 | * Not very nice, but we want to allow the driver to call | |
2228 | * ieee80211_beacon_get() as a response to the set_tim() | |
2229 | * callback. That, however, is already invoked under the | |
2230 | * sta_lock to guarantee consistent and race-free update | |
2231 | * of the tim bitmap in mac80211 and the driver. | |
2232 | */ | |
2233 | if (local->tim_in_locked_section) { | |
8e7be8da | 2234 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2235 | } else { |
2236 | unsigned long flags; | |
2237 | ||
2238 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 2239 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2240 | spin_unlock_irqrestore(&local->sta_lock, flags); |
2241 | } | |
33b64eb2 | 2242 | |
eddcbb94 JB |
2243 | if (tim_offset) |
2244 | *tim_offset = beacon->head_len; | |
2245 | if (tim_length) | |
2246 | *tim_length = skb->len - beacon->head_len; | |
2247 | ||
902acc78 JB |
2248 | if (beacon->tail) |
2249 | memcpy(skb_put(skb, beacon->tail_len), | |
2250 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
2251 | } else |
2252 | goto out; | |
05c914fe | 2253 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
46900298 | 2254 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
9d139c81 | 2255 | struct ieee80211_hdr *hdr; |
af8cdcd8 | 2256 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
33b64eb2 | 2257 | |
af8cdcd8 | 2258 | if (!presp) |
9d139c81 JB |
2259 | goto out; |
2260 | ||
af8cdcd8 | 2261 | skb = skb_copy(presp, GFP_ATOMIC); |
9d139c81 JB |
2262 | if (!skb) |
2263 | goto out; | |
2264 | ||
2265 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
2266 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2267 | IEEE80211_STYPE_BEACON); | |
902acc78 | 2268 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
2269 | struct ieee80211_mgmt *mgmt; |
2270 | u8 *pos; | |
2271 | ||
902acc78 JB |
2272 | /* headroom, head length, tail length and maximum TIM length */ |
2273 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
2274 | if (!skb) | |
2275 | goto out; | |
2276 | ||
2277 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2278 | mgmt = (struct ieee80211_mgmt *) | |
2279 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
2280 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
2281 | mgmt->frame_control = |
2282 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 | 2283 | memset(mgmt->da, 0xff, ETH_ALEN); |
47846c9b JB |
2284 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
2285 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
902acc78 | 2286 | mgmt->u.beacon.beacon_int = |
57c4d7b4 | 2287 | cpu_to_le16(sdata->vif.bss_conf.beacon_int); |
902acc78 JB |
2288 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ |
2289 | ||
2290 | pos = skb_put(skb, 2); | |
2291 | *pos++ = WLAN_EID_SSID; | |
2292 | *pos++ = 0x0; | |
2293 | ||
f698d856 | 2294 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
2295 | } else { |
2296 | WARN_ON(1); | |
5dfdaf58 | 2297 | goto out; |
e2ebc74d JB |
2298 | } |
2299 | ||
e039fa4a JB |
2300 | info = IEEE80211_SKB_CB(skb); |
2301 | ||
3b8d81e0 | 2302 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
e00cfce0 | 2303 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
e039fa4a | 2304 | info->band = band; |
e00cfce0 JM |
2305 | |
2306 | memset(&txrc, 0, sizeof(txrc)); | |
2307 | txrc.hw = hw; | |
2308 | txrc.sband = sband; | |
2309 | txrc.bss_conf = &sdata->vif.bss_conf; | |
2310 | txrc.skb = skb; | |
2311 | txrc.reported_rate.idx = -1; | |
37eb0b16 JM |
2312 | txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; |
2313 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) | |
2314 | txrc.max_rate_idx = -1; | |
2315 | else | |
2316 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
8f0729b1 | 2317 | txrc.bss = true; |
e00cfce0 | 2318 | rate_control_get_rate(sdata, NULL, &txrc); |
e039fa4a JB |
2319 | |
2320 | info->control.vif = vif; | |
f591fa5d | 2321 | |
a472e71b JL |
2322 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | |
2323 | IEEE80211_TX_CTL_ASSIGN_SEQ | | |
2324 | IEEE80211_TX_CTL_FIRST_FRAGMENT; | |
e6a9854b | 2325 | out: |
5dfdaf58 | 2326 | rcu_read_unlock(); |
e2ebc74d JB |
2327 | return skb; |
2328 | } | |
eddcbb94 | 2329 | EXPORT_SYMBOL(ieee80211_beacon_get_tim); |
e2ebc74d | 2330 | |
7044cc56 KV |
2331 | struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, |
2332 | struct ieee80211_vif *vif) | |
2333 | { | |
2334 | struct ieee80211_sub_if_data *sdata; | |
2335 | struct ieee80211_if_managed *ifmgd; | |
2336 | struct ieee80211_pspoll *pspoll; | |
2337 | struct ieee80211_local *local; | |
2338 | struct sk_buff *skb; | |
2339 | ||
2340 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2341 | return NULL; | |
2342 | ||
2343 | sdata = vif_to_sdata(vif); | |
2344 | ifmgd = &sdata->u.mgd; | |
2345 | local = sdata->local; | |
2346 | ||
2347 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); | |
2348 | if (!skb) { | |
2349 | printk(KERN_DEBUG "%s: failed to allocate buffer for " | |
2350 | "pspoll template\n", sdata->name); | |
2351 | return NULL; | |
2352 | } | |
2353 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2354 | ||
2355 | pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); | |
2356 | memset(pspoll, 0, sizeof(*pspoll)); | |
2357 | pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
2358 | IEEE80211_STYPE_PSPOLL); | |
2359 | pspoll->aid = cpu_to_le16(ifmgd->aid); | |
2360 | ||
2361 | /* aid in PS-Poll has its two MSBs each set to 1 */ | |
2362 | pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); | |
2363 | ||
2364 | memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); | |
2365 | memcpy(pspoll->ta, vif->addr, ETH_ALEN); | |
2366 | ||
2367 | return skb; | |
2368 | } | |
2369 | EXPORT_SYMBOL(ieee80211_pspoll_get); | |
2370 | ||
2371 | struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, | |
2372 | struct ieee80211_vif *vif) | |
2373 | { | |
2374 | struct ieee80211_hdr_3addr *nullfunc; | |
2375 | struct ieee80211_sub_if_data *sdata; | |
2376 | struct ieee80211_if_managed *ifmgd; | |
2377 | struct ieee80211_local *local; | |
2378 | struct sk_buff *skb; | |
2379 | ||
2380 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2381 | return NULL; | |
2382 | ||
2383 | sdata = vif_to_sdata(vif); | |
2384 | ifmgd = &sdata->u.mgd; | |
2385 | local = sdata->local; | |
2386 | ||
2387 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); | |
2388 | if (!skb) { | |
2389 | printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " | |
2390 | "template\n", sdata->name); | |
2391 | return NULL; | |
2392 | } | |
2393 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2394 | ||
2395 | nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, | |
2396 | sizeof(*nullfunc)); | |
2397 | memset(nullfunc, 0, sizeof(*nullfunc)); | |
2398 | nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
2399 | IEEE80211_STYPE_NULLFUNC | | |
2400 | IEEE80211_FCTL_TODS); | |
2401 | memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); | |
2402 | memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); | |
2403 | memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); | |
2404 | ||
2405 | return skb; | |
2406 | } | |
2407 | EXPORT_SYMBOL(ieee80211_nullfunc_get); | |
2408 | ||
05e54ea6 KV |
2409 | struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, |
2410 | struct ieee80211_vif *vif, | |
2411 | const u8 *ssid, size_t ssid_len, | |
2412 | const u8 *ie, size_t ie_len) | |
2413 | { | |
2414 | struct ieee80211_sub_if_data *sdata; | |
2415 | struct ieee80211_local *local; | |
2416 | struct ieee80211_hdr_3addr *hdr; | |
2417 | struct sk_buff *skb; | |
2418 | size_t ie_ssid_len; | |
2419 | u8 *pos; | |
2420 | ||
2421 | sdata = vif_to_sdata(vif); | |
2422 | local = sdata->local; | |
2423 | ie_ssid_len = 2 + ssid_len; | |
2424 | ||
2425 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + | |
2426 | ie_ssid_len + ie_len); | |
2427 | if (!skb) { | |
2428 | printk(KERN_DEBUG "%s: failed to allocate buffer for probe " | |
2429 | "request template\n", sdata->name); | |
2430 | return NULL; | |
2431 | } | |
2432 | ||
2433 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2434 | ||
2435 | hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); | |
2436 | memset(hdr, 0, sizeof(*hdr)); | |
2437 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
2438 | IEEE80211_STYPE_PROBE_REQ); | |
2439 | memset(hdr->addr1, 0xff, ETH_ALEN); | |
2440 | memcpy(hdr->addr2, vif->addr, ETH_ALEN); | |
2441 | memset(hdr->addr3, 0xff, ETH_ALEN); | |
2442 | ||
2443 | pos = skb_put(skb, ie_ssid_len); | |
2444 | *pos++ = WLAN_EID_SSID; | |
2445 | *pos++ = ssid_len; | |
2446 | if (ssid) | |
2447 | memcpy(pos, ssid, ssid_len); | |
2448 | pos += ssid_len; | |
2449 | ||
2450 | if (ie) { | |
2451 | pos = skb_put(skb, ie_len); | |
2452 | memcpy(pos, ie, ie_len); | |
2453 | } | |
2454 | ||
2455 | return skb; | |
2456 | } | |
2457 | EXPORT_SYMBOL(ieee80211_probereq_get); | |
2458 | ||
32bfd35d | 2459 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2460 | const void *frame, size_t frame_len, |
e039fa4a | 2461 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2462 | struct ieee80211_rts *rts) |
2463 | { | |
2464 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2465 | |
065e9605 HH |
2466 | rts->frame_control = |
2467 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
2468 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2469 | frame_txctl); | |
e2ebc74d JB |
2470 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2471 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2472 | } | |
2473 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2474 | ||
32bfd35d | 2475 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2476 | const void *frame, size_t frame_len, |
e039fa4a | 2477 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2478 | struct ieee80211_cts *cts) |
2479 | { | |
2480 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2481 | |
065e9605 HH |
2482 | cts->frame_control = |
2483 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2484 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2485 | frame_len, frame_txctl); | |
e2ebc74d JB |
2486 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2487 | } | |
2488 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2489 | ||
2490 | struct sk_buff * | |
32bfd35d | 2491 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2492 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2493 | { |
2494 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2495 | struct sk_buff *skb = NULL; |
e2ebc74d | 2496 | struct sta_info *sta; |
5cf121c3 | 2497 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2498 | struct ieee80211_sub_if_data *sdata; |
2499 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2500 | struct beacon_data *beacon; |
e039fa4a | 2501 | struct ieee80211_tx_info *info; |
e2ebc74d | 2502 | |
32bfd35d | 2503 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2504 | bss = &sdata->u.ap; |
5dfdaf58 | 2505 | |
5dfdaf58 JB |
2506 | rcu_read_lock(); |
2507 | beacon = rcu_dereference(bss->beacon); | |
2508 | ||
05c914fe | 2509 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2510 | goto out; |
5dfdaf58 | 2511 | |
e2ebc74d | 2512 | if (bss->dtim_count != 0) |
747cf5e9 | 2513 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2514 | |
e2ebc74d JB |
2515 | while (1) { |
2516 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2517 | if (!skb) | |
747cf5e9 | 2518 | goto out; |
e2ebc74d JB |
2519 | local->total_ps_buffered--; |
2520 | ||
2521 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2522 | struct ieee80211_hdr *hdr = | |
2523 | (struct ieee80211_hdr *) skb->data; | |
2524 | /* more buffered multicast/broadcast frames ==> set | |
2525 | * MoreData flag in IEEE 802.11 header to inform PS | |
2526 | * STAs */ | |
2527 | hdr->frame_control |= | |
2528 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2529 | } | |
2530 | ||
3b8d81e0 | 2531 | if (!ieee80211_tx_prepare(sdata, &tx, skb)) |
e2ebc74d JB |
2532 | break; |
2533 | dev_kfree_skb_any(skb); | |
2534 | } | |
e039fa4a JB |
2535 | |
2536 | info = IEEE80211_SKB_CB(skb); | |
2537 | ||
e2ebc74d | 2538 | sta = tx.sta; |
5cf121c3 JB |
2539 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2540 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2541 | info->band = tx.channel->band; |
e2ebc74d | 2542 | |
97b045d6 | 2543 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2544 | skb = NULL; |
97b045d6 | 2545 | out: |
d0709a65 | 2546 | rcu_read_unlock(); |
e2ebc74d JB |
2547 | |
2548 | return skb; | |
2549 | } | |
2550 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); | |
3b8d81e0 | 2551 | |
62ae67be | 2552 | void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
3b8d81e0 | 2553 | { |
3b8d81e0 JB |
2554 | skb_set_mac_header(skb, 0); |
2555 | skb_set_network_header(skb, 0); | |
2556 | skb_set_transport_header(skb, 0); | |
2557 | ||
cf0277e7 JB |
2558 | /* send all internal mgmt frames on VO */ |
2559 | skb_set_queue_mapping(skb, 0); | |
2560 | ||
3d34deb6 JB |
2561 | /* |
2562 | * The other path calling ieee80211_xmit is from the tasklet, | |
2563 | * and while we can handle concurrent transmissions locking | |
2564 | * requirements are that we do not come into tx with bhs on. | |
2565 | */ | |
2566 | local_bh_disable(); | |
3b8d81e0 | 2567 | ieee80211_xmit(sdata, skb); |
3d34deb6 | 2568 | local_bh_enable(); |
3b8d81e0 | 2569 | } |