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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 | 35 | |
e2ebc74d JB |
36 | /* misc utils */ |
37 | ||
03f93c3d JB |
38 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
39 | int next_frag_len) | |
e2ebc74d JB |
40 | { |
41 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 42 | struct ieee80211_rate *txrate; |
e2ebc74d | 43 | struct ieee80211_local *local = tx->local; |
8318d78a | 44 | struct ieee80211_supported_band *sband; |
358c8d9d | 45 | struct ieee80211_hdr *hdr; |
e6a9854b JB |
46 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
47 | ||
48 | /* assume HW handles this */ | |
49 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) | |
50 | return 0; | |
51 | ||
52 | /* uh huh? */ | |
53 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) | |
54 | return 0; | |
e2ebc74d | 55 | |
2e92e6f2 | 56 | sband = local->hw.wiphy->bands[tx->channel->band]; |
e6a9854b | 57 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
8318d78a | 58 | |
e6a9854b | 59 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
e2ebc74d JB |
60 | |
61 | /* | |
62 | * data and mgmt (except PS Poll): | |
63 | * - during CFP: 32768 | |
64 | * - during contention period: | |
65 | * if addr1 is group address: 0 | |
66 | * if more fragments = 0 and addr1 is individual address: time to | |
67 | * transmit one ACK plus SIFS | |
68 | * if more fragments = 1 and addr1 is individual address: time to | |
69 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
70 | * | |
71 | * IEEE 802.11, 9.6: | |
72 | * - control response frame (CTS or ACK) shall be transmitted using the | |
73 | * same rate as the immediately previous frame in the frame exchange | |
74 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
75 | * at the highest possible rate belonging to the PHY rates in the | |
76 | * BSSBasicRateSet | |
77 | */ | |
358c8d9d HH |
78 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
79 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d | 80 | /* TODO: These control frames are not currently sent by |
ccd7b362 | 81 | * mac80211, but should they be implemented, this function |
e2ebc74d JB |
82 | * needs to be updated to support duration field calculation. |
83 | * | |
84 | * RTS: time needed to transmit pending data/mgmt frame plus | |
85 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
86 | * CTS: duration of immediately previous RTS minus time | |
87 | * required to transmit CTS and its SIFS | |
88 | * ACK: 0 if immediately previous directed data/mgmt had | |
89 | * more=0, with more=1 duration in ACK frame is duration | |
90 | * from previous frame minus time needed to transmit ACK | |
91 | * and its SIFS | |
92 | * PS Poll: BIT(15) | BIT(14) | aid | |
93 | */ | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* data/mgmt */ | |
98 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 99 | return cpu_to_le16(32768); |
e2ebc74d JB |
100 | |
101 | if (group_addr) /* Group address as the destination - no ACK */ | |
102 | return 0; | |
103 | ||
104 | /* Individual destination address: | |
105 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
106 | * CTS and ACK frames shall be transmitted using the highest rate in | |
107 | * basic rate set that is less than or equal to the rate of the | |
108 | * immediately previous frame and that is using the same modulation | |
109 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
110 | * the highest mandatory rate of the PHY that is less than or equal to | |
111 | * the rate of the previous frame is used. | |
112 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
113 | */ | |
114 | rate = -1; | |
8318d78a JB |
115 | /* use lowest available if everything fails */ |
116 | mrate = sband->bitrates[0].bitrate; | |
117 | for (i = 0; i < sband->n_bitrates; i++) { | |
118 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 119 | |
8318d78a JB |
120 | if (r->bitrate > txrate->bitrate) |
121 | break; | |
e2ebc74d | 122 | |
bda3933a | 123 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
8318d78a JB |
124 | rate = r->bitrate; |
125 | ||
126 | switch (sband->band) { | |
127 | case IEEE80211_BAND_2GHZ: { | |
128 | u32 flag; | |
129 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
130 | flag = IEEE80211_RATE_MANDATORY_G; | |
131 | else | |
132 | flag = IEEE80211_RATE_MANDATORY_B; | |
133 | if (r->flags & flag) | |
134 | mrate = r->bitrate; | |
135 | break; | |
136 | } | |
137 | case IEEE80211_BAND_5GHZ: | |
138 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
139 | mrate = r->bitrate; | |
140 | break; | |
141 | case IEEE80211_NUM_BANDS: | |
142 | WARN_ON(1); | |
143 | break; | |
144 | } | |
e2ebc74d JB |
145 | } |
146 | if (rate == -1) { | |
147 | /* No matching basic rate found; use highest suitable mandatory | |
148 | * PHY rate */ | |
149 | rate = mrate; | |
150 | } | |
151 | ||
152 | /* Time needed to transmit ACK | |
153 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
154 | * to closest integer */ | |
155 | ||
156 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
bda3933a | 157 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
158 | |
159 | if (next_frag_len) { | |
160 | /* Frame is fragmented: duration increases with time needed to | |
161 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
162 | dur *= 2; /* ACK + SIFS */ | |
163 | /* next fragment */ | |
164 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 165 | txrate->bitrate, erp, |
bda3933a | 166 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
167 | } |
168 | ||
03f93c3d | 169 | return cpu_to_le16(dur); |
e2ebc74d JB |
170 | } |
171 | ||
42b16b3f | 172 | static inline int is_ieee80211_device(struct ieee80211_local *local, |
133b8226 | 173 | struct net_device *dev) |
e2ebc74d | 174 | { |
133b8226 | 175 | return local == wdev_priv(dev->ieee80211_ptr); |
e2ebc74d JB |
176 | } |
177 | ||
178 | /* tx handlers */ | |
5c1b98a5 KV |
179 | static ieee80211_tx_result debug_noinline |
180 | ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) | |
181 | { | |
182 | struct ieee80211_local *local = tx->local; | |
0c74211d | 183 | struct ieee80211_if_managed *ifmgd; |
5c1b98a5 KV |
184 | |
185 | /* driver doesn't support power save */ | |
186 | if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) | |
187 | return TX_CONTINUE; | |
188 | ||
189 | /* hardware does dynamic power save */ | |
190 | if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) | |
191 | return TX_CONTINUE; | |
192 | ||
193 | /* dynamic power save disabled */ | |
194 | if (local->hw.conf.dynamic_ps_timeout <= 0) | |
195 | return TX_CONTINUE; | |
196 | ||
197 | /* we are scanning, don't enable power save */ | |
198 | if (local->scanning) | |
199 | return TX_CONTINUE; | |
200 | ||
201 | if (!local->ps_sdata) | |
202 | return TX_CONTINUE; | |
203 | ||
204 | /* No point if we're going to suspend */ | |
205 | if (local->quiescing) | |
206 | return TX_CONTINUE; | |
207 | ||
0c74211d KV |
208 | /* dynamic ps is supported only in managed mode */ |
209 | if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) | |
210 | return TX_CONTINUE; | |
211 | ||
212 | ifmgd = &tx->sdata->u.mgd; | |
213 | ||
214 | /* | |
215 | * Don't wakeup from power save if u-apsd is enabled, voip ac has | |
216 | * u-apsd enabled and the frame is in voip class. This effectively | |
217 | * means that even if all access categories have u-apsd enabled, in | |
218 | * practise u-apsd is only used with the voip ac. This is a | |
219 | * workaround for the case when received voip class packets do not | |
220 | * have correct qos tag for some reason, due the network or the | |
221 | * peer application. | |
222 | * | |
223 | * Note: local->uapsd_queues access is racy here. If the value is | |
224 | * changed via debugfs, user needs to reassociate manually to have | |
225 | * everything in sync. | |
226 | */ | |
227 | if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) | |
228 | && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) | |
229 | && skb_get_queue_mapping(tx->skb) == 0) | |
230 | return TX_CONTINUE; | |
231 | ||
5c1b98a5 KV |
232 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
233 | ieee80211_stop_queues_by_reason(&local->hw, | |
234 | IEEE80211_QUEUE_STOP_REASON_PS); | |
db28569a | 235 | ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; |
5c1b98a5 KV |
236 | ieee80211_queue_work(&local->hw, |
237 | &local->dynamic_ps_disable_work); | |
238 | } | |
239 | ||
5db1c07c LC |
240 | /* Don't restart the timer if we're not disassociated */ |
241 | if (!ifmgd->associated) | |
242 | return TX_CONTINUE; | |
243 | ||
5c1b98a5 KV |
244 | mod_timer(&local->dynamic_ps_timer, jiffies + |
245 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
246 | ||
247 | return TX_CONTINUE; | |
248 | } | |
e2ebc74d | 249 | |
d9e8a70f | 250 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 251 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 252 | { |
358c8d9d | 253 | |
e039fa4a | 254 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 255 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
c2c98fde | 256 | bool assoc = false; |
e2ebc74d | 257 | |
e039fa4a | 258 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 259 | return TX_CONTINUE; |
58d4185e | 260 | |
b23b025f BG |
261 | if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && |
262 | test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && | |
a9a6ffff KV |
263 | !ieee80211_is_probe_req(hdr->frame_control) && |
264 | !ieee80211_is_nullfunc(hdr->frame_control)) | |
265 | /* | |
266 | * When software scanning only nullfunc frames (to notify | |
267 | * the sleep state to the AP) and probe requests (for the | |
268 | * active scan) are allowed, all other frames should not be | |
269 | * sent and we should not get here, but if we do | |
270 | * nonetheless, drop them to avoid sending them | |
271 | * off-channel. See the link below and | |
272 | * ieee80211_start_scan() for more. | |
273 | * | |
274 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 | |
275 | */ | |
9ae54c84 | 276 | return TX_DROP; |
e2ebc74d | 277 | |
1be7fe8d BJ |
278 | if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) |
279 | return TX_CONTINUE; | |
280 | ||
05c914fe | 281 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
282 | return TX_CONTINUE; |
283 | ||
5cf121c3 | 284 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 285 | return TX_CONTINUE; |
e2ebc74d | 286 | |
c2c98fde JB |
287 | if (tx->sta) |
288 | assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); | |
e2ebc74d | 289 | |
5cf121c3 | 290 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
c2c98fde | 291 | if (unlikely(!assoc && |
05c914fe | 292 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 293 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
294 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
295 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 | 296 | "associated station %pM\n", |
47846c9b | 297 | tx->sdata->name, hdr->addr1); |
e2ebc74d JB |
298 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
299 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 300 | return TX_DROP; |
e2ebc74d JB |
301 | } |
302 | } else { | |
358c8d9d | 303 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 304 | tx->local->num_sta == 0 && |
05c914fe | 305 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
306 | /* |
307 | * No associated STAs - no need to send multicast | |
308 | * frames. | |
309 | */ | |
9ae54c84 | 310 | return TX_DROP; |
e2ebc74d | 311 | } |
9ae54c84 | 312 | return TX_CONTINUE; |
e2ebc74d JB |
313 | } |
314 | ||
9ae54c84 | 315 | return TX_CONTINUE; |
e2ebc74d JB |
316 | } |
317 | ||
e2ebc74d JB |
318 | /* This function is called whenever the AP is about to exceed the maximum limit |
319 | * of buffered frames for power saving STAs. This situation should not really | |
320 | * happen often during normal operation, so dropping the oldest buffered packet | |
321 | * from each queue should be OK to make some room for new frames. */ | |
322 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
323 | { | |
324 | int total = 0, purged = 0; | |
325 | struct sk_buff *skb; | |
326 | struct ieee80211_sub_if_data *sdata; | |
327 | struct sta_info *sta; | |
328 | ||
79010420 JB |
329 | /* |
330 | * virtual interfaces are protected by RCU | |
331 | */ | |
332 | rcu_read_lock(); | |
333 | ||
334 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 335 | struct ieee80211_if_ap *ap; |
05c914fe | 336 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
337 | continue; |
338 | ap = &sdata->u.ap; | |
339 | skb = skb_dequeue(&ap->ps_bc_buf); | |
340 | if (skb) { | |
341 | purged++; | |
342 | dev_kfree_skb(skb); | |
343 | } | |
344 | total += skb_queue_len(&ap->ps_bc_buf); | |
345 | } | |
e2ebc74d | 346 | |
948d887d JB |
347 | /* |
348 | * Drop one frame from each station from the lowest-priority | |
349 | * AC that has frames at all. | |
350 | */ | |
d0709a65 | 351 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
948d887d JB |
352 | int ac; |
353 | ||
354 | for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { | |
355 | skb = skb_dequeue(&sta->ps_tx_buf[ac]); | |
356 | total += skb_queue_len(&sta->ps_tx_buf[ac]); | |
357 | if (skb) { | |
358 | purged++; | |
359 | dev_kfree_skb(skb); | |
360 | break; | |
361 | } | |
e2ebc74d | 362 | } |
e2ebc74d | 363 | } |
d0709a65 JB |
364 | |
365 | rcu_read_unlock(); | |
e2ebc74d JB |
366 | |
367 | local->total_ps_buffered = total; | |
54223995 | 368 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0fb9a9ec JP |
369 | wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n", |
370 | purged); | |
f4ea83dd | 371 | #endif |
e2ebc74d JB |
372 | } |
373 | ||
9ae54c84 | 374 | static ieee80211_tx_result |
5cf121c3 | 375 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 376 | { |
e039fa4a | 377 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 378 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 379 | |
7d54d0dd JB |
380 | /* |
381 | * broadcast/multicast frame | |
382 | * | |
383 | * If any of the associated stations is in power save mode, | |
384 | * the frame is buffered to be sent after DTIM beacon frame. | |
385 | * This is done either by the hardware or us. | |
386 | */ | |
387 | ||
3e122be0 JB |
388 | /* powersaving STAs only in AP/VLAN mode */ |
389 | if (!tx->sdata->bss) | |
390 | return TX_CONTINUE; | |
391 | ||
392 | /* no buffering for ordered frames */ | |
358c8d9d | 393 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 394 | return TX_CONTINUE; |
7d54d0dd JB |
395 | |
396 | /* no stations in PS mode */ | |
397 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 398 | return TX_CONTINUE; |
7d54d0dd | 399 | |
62b517cb | 400 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
62b1208e | 401 | |
62b517cb JB |
402 | /* device releases frame after DTIM beacon */ |
403 | if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) | |
62b1208e | 404 | return TX_CONTINUE; |
62b1208e | 405 | |
7d54d0dd | 406 | /* buffered in mac80211 */ |
62b1208e JB |
407 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
408 | purge_old_ps_buffers(tx->local); | |
409 | ||
410 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { | |
54223995 | 411 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
62b1208e JB |
412 | if (net_ratelimit()) |
413 | printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", | |
47846c9b | 414 | tx->sdata->name); |
f4ea83dd | 415 | #endif |
62b1208e JB |
416 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
417 | } else | |
418 | tx->local->total_ps_buffered++; | |
e2ebc74d | 419 | |
62b1208e | 420 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); |
7d54d0dd | 421 | |
62b1208e | 422 | return TX_QUEUED; |
e2ebc74d JB |
423 | } |
424 | ||
fb733336 JM |
425 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
426 | struct sk_buff *skb) | |
427 | { | |
428 | if (!ieee80211_is_mgmt(fc)) | |
429 | return 0; | |
430 | ||
c2c98fde | 431 | if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) |
fb733336 JM |
432 | return 0; |
433 | ||
434 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) | |
435 | skb->data)) | |
436 | return 0; | |
437 | ||
438 | return 1; | |
439 | } | |
440 | ||
9ae54c84 | 441 | static ieee80211_tx_result |
5cf121c3 | 442 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
443 | { |
444 | struct sta_info *sta = tx->sta; | |
e039fa4a | 445 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 446 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
3393a608 | 447 | struct ieee80211_local *local = tx->local; |
e2ebc74d | 448 | |
f64f9e71 JP |
449 | if (unlikely(!sta || |
450 | ieee80211_is_probe_resp(hdr->frame_control) || | |
451 | ieee80211_is_auth(hdr->frame_control) || | |
452 | ieee80211_is_assoc_resp(hdr->frame_control) || | |
453 | ieee80211_is_reassoc_resp(hdr->frame_control))) | |
9ae54c84 | 454 | return TX_CONTINUE; |
e2ebc74d | 455 | |
c2c98fde JB |
456 | if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || |
457 | test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && | |
47086fc5 | 458 | !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) { |
948d887d JB |
459 | int ac = skb_get_queue_mapping(tx->skb); |
460 | ||
e2ebc74d | 461 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
948d887d JB |
462 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n", |
463 | sta->sta.addr, sta->sta.aid, ac); | |
e2ebc74d | 464 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e2ebc74d JB |
465 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
466 | purge_old_ps_buffers(tx->local); | |
948d887d JB |
467 | if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { |
468 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); | |
54223995 | 469 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
948d887d JB |
470 | if (net_ratelimit()) |
471 | printk(KERN_DEBUG "%s: STA %pM TX buffer for " | |
472 | "AC %d full - dropping oldest frame\n", | |
473 | tx->sdata->name, sta->sta.addr, ac); | |
f4ea83dd | 474 | #endif |
e2ebc74d JB |
475 | dev_kfree_skb(old); |
476 | } else | |
477 | tx->local->total_ps_buffered++; | |
004c872e | 478 | |
e039fa4a | 479 | info->control.jiffies = jiffies; |
5061b0c2 | 480 | info->control.vif = &tx->sdata->vif; |
8f77f384 | 481 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
948d887d | 482 | skb_queue_tail(&sta->ps_tx_buf[ac], 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 | ||
c868cb35 JB |
489 | /* |
490 | * We queued up some frames, so the TIM bit might | |
491 | * need to be set, recalculate it. | |
492 | */ | |
493 | sta_info_recalc_tim(sta); | |
494 | ||
9ae54c84 | 495 | return TX_QUEUED; |
e2ebc74d JB |
496 | } |
497 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
c2c98fde | 498 | else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { |
47086fc5 JB |
499 | printk(KERN_DEBUG |
500 | "%s: STA %pM in PS mode, but polling/in SP -> send frame\n", | |
501 | tx->sdata->name, sta->sta.addr); | |
e2ebc74d JB |
502 | } |
503 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d | 504 | |
9ae54c84 | 505 | return TX_CONTINUE; |
e2ebc74d JB |
506 | } |
507 | ||
d9e8a70f | 508 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 509 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 510 | { |
5cf121c3 | 511 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 512 | return TX_CONTINUE; |
e2ebc74d | 513 | |
5cf121c3 | 514 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
515 | return ieee80211_tx_h_unicast_ps_buf(tx); |
516 | else | |
517 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
518 | } | |
519 | ||
a621fa4d JB |
520 | static ieee80211_tx_result debug_noinline |
521 | ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) | |
522 | { | |
523 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
524 | ||
525 | if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && | |
526 | tx->sdata->control_port_no_encrypt)) | |
527 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; | |
528 | ||
529 | return TX_CONTINUE; | |
530 | } | |
531 | ||
d9e8a70f | 532 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 533 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 534 | { |
d3feaf5a | 535 | struct ieee80211_key *key = NULL; |
e039fa4a | 536 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 537 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 538 | |
3b8d81e0 | 539 | if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) |
e2ebc74d | 540 | tx->key = NULL; |
e31b8213 | 541 | else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) |
d4e46a3d | 542 | tx->key = key; |
3cfcf6ac | 543 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
ecbcd324 JM |
544 | is_multicast_ether_addr(hdr->addr1) && |
545 | ieee80211_is_robust_mgmt_frame(hdr) && | |
3cfcf6ac JM |
546 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) |
547 | tx->key = key; | |
f7e0104c JB |
548 | else if (is_multicast_ether_addr(hdr->addr1) && |
549 | (key = rcu_dereference(tx->sdata->default_multicast_key))) | |
550 | tx->key = key; | |
551 | else if (!is_multicast_ether_addr(hdr->addr1) && | |
552 | (key = rcu_dereference(tx->sdata->default_unicast_key))) | |
d4e46a3d | 553 | tx->key = key; |
e2ebc74d | 554 | else if (tx->sdata->drop_unencrypted && |
a621fa4d | 555 | (tx->skb->protocol != tx->sdata->control_port_protocol) && |
e0463f50 JM |
556 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
557 | (!ieee80211_is_robust_mgmt_frame(hdr) || | |
558 | (ieee80211_is_action(hdr->frame_control) && | |
c2c98fde | 559 | tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) { |
e2ebc74d | 560 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 561 | return TX_DROP; |
176e4f84 | 562 | } else |
e2ebc74d JB |
563 | tx->key = NULL; |
564 | ||
565 | if (tx->key) { | |
813d7669 JB |
566 | bool skip_hw = false; |
567 | ||
e2ebc74d | 568 | tx->key->tx_rx_count++; |
011bfcc4 | 569 | /* TODO: add threshold stuff again */ |
176e4f84 | 570 | |
97359d12 JB |
571 | switch (tx->key->conf.cipher) { |
572 | case WLAN_CIPHER_SUITE_WEP40: | |
573 | case WLAN_CIPHER_SUITE_WEP104: | |
358c8d9d | 574 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 | 575 | break; |
97359d12 | 576 | case WLAN_CIPHER_SUITE_TKIP: |
358c8d9d | 577 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
578 | tx->key = NULL; |
579 | break; | |
97359d12 | 580 | case WLAN_CIPHER_SUITE_CCMP: |
fb733336 JM |
581 | if (!ieee80211_is_data_present(hdr->frame_control) && |
582 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
583 | tx->skb)) | |
584 | tx->key = NULL; | |
3b43a187 KV |
585 | else |
586 | skip_hw = (tx->key->conf.flags & | |
587 | IEEE80211_KEY_FLAG_SW_MGMT) && | |
588 | ieee80211_is_mgmt(hdr->frame_control); | |
fb733336 | 589 | break; |
97359d12 | 590 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
591 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
592 | tx->key = NULL; | |
593 | break; | |
176e4f84 | 594 | } |
813d7669 | 595 | |
95acac61 JB |
596 | if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED)) |
597 | return TX_DROP; | |
598 | ||
f12553eb | 599 | if (!skip_hw && tx->key && |
382b1655 | 600 | tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
813d7669 | 601 | info->control.hw_key = &tx->key->conf; |
e2ebc74d JB |
602 | } |
603 | ||
9ae54c84 | 604 | return TX_CONTINUE; |
e2ebc74d JB |
605 | } |
606 | ||
d9e8a70f | 607 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 608 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 609 | { |
e039fa4a | 610 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
611 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
612 | struct ieee80211_supported_band *sband; | |
613 | struct ieee80211_rate *rate; | |
a2c40249 SZ |
614 | int i; |
615 | u32 len; | |
e6a9854b JB |
616 | bool inval = false, rts = false, short_preamble = false; |
617 | struct ieee80211_tx_rate_control txrc; | |
c2c98fde | 618 | bool assoc = false; |
8318d78a | 619 | |
e6a9854b | 620 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 621 | |
e6a9854b | 622 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 623 | |
a2c40249 | 624 | len = min_t(u32, tx->skb->len + FCS_LEN, |
b9a5f8ca | 625 | tx->local->hw.wiphy->frag_threshold); |
e6a9854b JB |
626 | |
627 | /* set up the tx rate control struct we give the RC algo */ | |
628 | txrc.hw = local_to_hw(tx->local); | |
629 | txrc.sband = sband; | |
630 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
631 | txrc.skb = tx->skb; | |
632 | txrc.reported_rate.idx = -1; | |
37eb0b16 JM |
633 | txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; |
634 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) | |
635 | txrc.max_rate_idx = -1; | |
636 | else | |
637 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
8f0729b1 FF |
638 | txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || |
639 | tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); | |
e6a9854b JB |
640 | |
641 | /* set up RTS protection if desired */ | |
b9a5f8ca | 642 | if (len > tx->local->hw.wiphy->rts_threshold) { |
e6a9854b | 643 | txrc.rts = rts = true; |
e2ebc74d | 644 | } |
e2ebc74d | 645 | |
e6a9854b JB |
646 | /* |
647 | * Use short preamble if the BSS can handle it, but not for | |
648 | * management frames unless we know the receiver can handle | |
649 | * that -- the management frame might be to a station that | |
650 | * just wants a probe response. | |
651 | */ | |
652 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
653 | (ieee80211_is_data(hdr->frame_control) || | |
c2c98fde | 654 | (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) |
e6a9854b | 655 | txrc.short_preamble = short_preamble = true; |
e2ebc74d | 656 | |
c2c98fde JB |
657 | if (tx->sta) |
658 | assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); | |
b770b43e LR |
659 | |
660 | /* | |
661 | * Lets not bother rate control if we're associated and cannot | |
662 | * talk to the sta. This should not happen. | |
663 | */ | |
c2c98fde | 664 | if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && |
b770b43e LR |
665 | !rate_usable_index_exists(sband, &tx->sta->sta), |
666 | "%s: Dropped data frame as no usable bitrate found while " | |
667 | "scanning and associated. Target station: " | |
668 | "%pM on %d GHz band\n", | |
47846c9b | 669 | tx->sdata->name, hdr->addr1, |
b770b43e LR |
670 | tx->channel->band ? 5 : 2)) |
671 | return TX_DROP; | |
2e92e6f2 | 672 | |
b770b43e LR |
673 | /* |
674 | * If we're associated with the sta at this point we know we can at | |
675 | * least send the frame at the lowest bit rate. | |
676 | */ | |
e6a9854b JB |
677 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
678 | ||
679 | if (unlikely(info->control.rates[0].idx < 0)) | |
680 | return TX_DROP; | |
681 | ||
c1ce5a74 | 682 | if (txrc.reported_rate.idx < 0) { |
e6a9854b | 683 | txrc.reported_rate = info->control.rates[0]; |
c1ce5a74 HS |
684 | if (tx->sta && ieee80211_is_data(hdr->frame_control)) |
685 | tx->sta->last_tx_rate = txrc.reported_rate; | |
686 | } else if (tx->sta) | |
e6a9854b | 687 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 688 | |
e6a9854b JB |
689 | if (unlikely(!info->control.rates[0].count)) |
690 | info->control.rates[0].count = 1; | |
e2ebc74d | 691 | |
9955151d GS |
692 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && |
693 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) | |
694 | info->control.rates[0].count = 1; | |
695 | ||
e6a9854b JB |
696 | if (is_multicast_ether_addr(hdr->addr1)) { |
697 | /* | |
698 | * XXX: verify the rate is in the basic rateset | |
699 | */ | |
700 | return TX_CONTINUE; | |
e2ebc74d JB |
701 | } |
702 | ||
e6a9854b JB |
703 | /* |
704 | * set up the RTS/CTS rate as the fastest basic rate | |
705 | * that is not faster than the data rate | |
706 | * | |
707 | * XXX: Should this check all retry rates? | |
708 | */ | |
709 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
710 | s8 baserate = 0; | |
711 | ||
712 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
713 | ||
714 | for (i = 0; i < sband->n_bitrates; i++) { | |
715 | /* must be a basic rate */ | |
716 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
717 | continue; | |
718 | /* must not be faster than the data rate */ | |
719 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
720 | continue; | |
721 | /* maximum */ | |
722 | if (sband->bitrates[baserate].bitrate < | |
723 | sband->bitrates[i].bitrate) | |
724 | baserate = i; | |
725 | } | |
726 | ||
727 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
728 | } |
729 | ||
e6a9854b JB |
730 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
731 | /* | |
732 | * make sure there's no valid rate following | |
733 | * an invalid one, just in case drivers don't | |
734 | * take the API seriously to stop at -1. | |
735 | */ | |
736 | if (inval) { | |
737 | info->control.rates[i].idx = -1; | |
738 | continue; | |
739 | } | |
740 | if (info->control.rates[i].idx < 0) { | |
741 | inval = true; | |
742 | continue; | |
743 | } | |
8318d78a | 744 | |
e6a9854b JB |
745 | /* |
746 | * For now assume MCS is already set up correctly, this | |
747 | * needs to be fixed. | |
748 | */ | |
749 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
750 | WARN_ON(info->control.rates[i].idx > 76); | |
751 | continue; | |
752 | } | |
e2ebc74d | 753 | |
e6a9854b JB |
754 | /* set up RTS protection if desired */ |
755 | if (rts) | |
756 | info->control.rates[i].flags |= | |
757 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 758 | |
e6a9854b | 759 | /* RC is busted */ |
075cbc9e S |
760 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
761 | sband->n_bitrates)) { | |
e6a9854b JB |
762 | info->control.rates[i].idx = -1; |
763 | continue; | |
8318d78a | 764 | } |
e2ebc74d | 765 | |
e6a9854b JB |
766 | rate = &sband->bitrates[info->control.rates[i].idx]; |
767 | ||
768 | /* set up short preamble */ | |
769 | if (short_preamble && | |
770 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
771 | info->control.rates[i].flags |= | |
772 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
773 | ||
774 | /* set up G protection */ | |
775 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
776 | rate->flags & IEEE80211_RATE_ERP_G) | |
777 | info->control.rates[i].flags |= | |
778 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
779 | } |
780 | ||
e6a9854b JB |
781 | return TX_CONTINUE; |
782 | } | |
783 | ||
f591fa5d JB |
784 | static ieee80211_tx_result debug_noinline |
785 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
786 | { | |
787 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
788 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
789 | u16 *seq; | |
790 | u8 *qc; | |
791 | int tid; | |
792 | ||
25d834e1 JB |
793 | /* |
794 | * Packet injection may want to control the sequence | |
795 | * number, if we have no matching interface then we | |
796 | * neither assign one ourselves nor ask the driver to. | |
797 | */ | |
5061b0c2 | 798 | if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) |
25d834e1 JB |
799 | return TX_CONTINUE; |
800 | ||
f591fa5d JB |
801 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
802 | return TX_CONTINUE; | |
803 | ||
804 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
805 | return TX_CONTINUE; | |
806 | ||
49a59543 JB |
807 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) |
808 | return TX_CONTINUE; | |
809 | ||
94778280 JB |
810 | /* |
811 | * Anything but QoS data that has a sequence number field | |
812 | * (is long enough) gets a sequence number from the global | |
813 | * counter. | |
814 | */ | |
f591fa5d | 815 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 816 | /* driver should assign sequence number */ |
f591fa5d | 817 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
818 | /* for pure STA mode without beacons, we can do it */ |
819 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
820 | tx->sdata->sequence_number += 0x10; | |
f591fa5d JB |
821 | return TX_CONTINUE; |
822 | } | |
823 | ||
824 | /* | |
825 | * This should be true for injected/management frames only, for | |
826 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
827 | * above since they are not QoS-data frames. | |
828 | */ | |
829 | if (!tx->sta) | |
830 | return TX_CONTINUE; | |
831 | ||
832 | /* include per-STA, per-TID sequence counter */ | |
833 | ||
834 | qc = ieee80211_get_qos_ctl(hdr); | |
835 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
836 | seq = &tx->sta->tid_seq[tid]; | |
837 | ||
838 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
839 | ||
840 | /* Increase the sequence number. */ | |
841 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
842 | ||
843 | return TX_CONTINUE; | |
844 | } | |
845 | ||
2de8e0d9 JB |
846 | static int ieee80211_fragment(struct ieee80211_local *local, |
847 | struct sk_buff *skb, int hdrlen, | |
848 | int frag_threshold) | |
849 | { | |
850 | struct sk_buff *tail = skb, *tmp; | |
851 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
852 | int pos = hdrlen + per_fragm; | |
853 | int rem = skb->len - hdrlen - per_fragm; | |
854 | ||
855 | if (WARN_ON(rem < 0)) | |
856 | return -EINVAL; | |
857 | ||
858 | while (rem) { | |
859 | int fraglen = per_fragm; | |
860 | ||
861 | if (fraglen > rem) | |
862 | fraglen = rem; | |
863 | rem -= fraglen; | |
864 | tmp = dev_alloc_skb(local->tx_headroom + | |
865 | frag_threshold + | |
866 | IEEE80211_ENCRYPT_HEADROOM + | |
867 | IEEE80211_ENCRYPT_TAILROOM); | |
868 | if (!tmp) | |
869 | return -ENOMEM; | |
870 | tail->next = tmp; | |
871 | tail = tmp; | |
872 | skb_reserve(tmp, local->tx_headroom + | |
873 | IEEE80211_ENCRYPT_HEADROOM); | |
874 | /* copy control information */ | |
875 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); | |
876 | skb_copy_queue_mapping(tmp, skb); | |
877 | tmp->priority = skb->priority; | |
2de8e0d9 | 878 | tmp->dev = skb->dev; |
2de8e0d9 JB |
879 | |
880 | /* copy header and data */ | |
881 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); | |
882 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); | |
883 | ||
884 | pos += fraglen; | |
885 | } | |
886 | ||
887 | skb->len = hdrlen + per_fragm; | |
888 | return 0; | |
889 | } | |
890 | ||
d9e8a70f | 891 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
892 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
893 | { | |
2de8e0d9 JB |
894 | struct sk_buff *skb = tx->skb; |
895 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
896 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
b9a5f8ca | 897 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; |
2de8e0d9 JB |
898 | int hdrlen; |
899 | int fragnum; | |
e2454948 | 900 | |
a26eb27a JB |
901 | if (info->flags & IEEE80211_TX_CTL_DONTFRAG) |
902 | return TX_CONTINUE; | |
903 | ||
904 | if (tx->local->ops->set_frag_threshold) | |
e2454948 JB |
905 | return TX_CONTINUE; |
906 | ||
eefce91a JB |
907 | /* |
908 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
3b8d81e0 | 909 | * This scenario is handled in ieee80211_tx_prepare but extra |
8d5e0d58 | 910 | * caution taken here as fragmented ampdu may cause Tx stop. |
eefce91a | 911 | */ |
8b30b1fe | 912 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
913 | return TX_DROP; |
914 | ||
065e9605 | 915 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 | 916 | |
a26eb27a | 917 | /* internal error, why isn't DONTFRAG set? */ |
8ccd8f21 | 918 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) |
2de8e0d9 | 919 | return TX_DROP; |
e6a9854b | 920 | |
2de8e0d9 JB |
921 | /* |
922 | * Now fragment the frame. This will allocate all the fragments and | |
923 | * chain them (using skb as the first fragment) to skb->next. | |
924 | * During transmission, we will remove the successfully transmitted | |
925 | * fragments from this list. When the low-level driver rejects one | |
926 | * of the fragments then we will simply pretend to accept the skb | |
927 | * but store it away as pending. | |
928 | */ | |
929 | if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) | |
930 | return TX_DROP; | |
e6a9854b | 931 | |
2de8e0d9 JB |
932 | /* update duration/seq/flags of fragments */ |
933 | fragnum = 0; | |
934 | do { | |
935 | int next_len; | |
936 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
e6a9854b | 937 | |
2de8e0d9 JB |
938 | hdr = (void *)skb->data; |
939 | info = IEEE80211_SKB_CB(skb); | |
e6a9854b | 940 | |
2de8e0d9 JB |
941 | if (skb->next) { |
942 | hdr->frame_control |= morefrags; | |
943 | next_len = skb->next->len; | |
e6a9854b JB |
944 | /* |
945 | * No multi-rate retries for fragmented frames, that | |
946 | * would completely throw off the NAV at other STAs. | |
947 | */ | |
948 | info->control.rates[1].idx = -1; | |
949 | info->control.rates[2].idx = -1; | |
950 | info->control.rates[3].idx = -1; | |
951 | info->control.rates[4].idx = -1; | |
952 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
953 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
2de8e0d9 JB |
954 | } else { |
955 | hdr->frame_control &= ~morefrags; | |
956 | next_len = 0; | |
e6a9854b | 957 | } |
2de8e0d9 JB |
958 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); |
959 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); | |
960 | fragnum++; | |
961 | } while ((skb = skb->next)); | |
e2ebc74d | 962 | |
9ae54c84 | 963 | return TX_CONTINUE; |
e2ebc74d JB |
964 | } |
965 | ||
feff1f2f JB |
966 | static ieee80211_tx_result debug_noinline |
967 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) | |
968 | { | |
969 | struct sk_buff *skb = tx->skb; | |
970 | ||
971 | if (!tx->sta) | |
972 | return TX_CONTINUE; | |
973 | ||
974 | tx->sta->tx_packets++; | |
975 | do { | |
976 | tx->sta->tx_fragments++; | |
977 | tx->sta->tx_bytes += skb->len; | |
978 | } while ((skb = skb->next)); | |
979 | ||
980 | return TX_CONTINUE; | |
981 | } | |
982 | ||
d9e8a70f | 983 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
984 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
985 | { | |
3ffc2a90 JB |
986 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
987 | ||
e2454948 JB |
988 | if (!tx->key) |
989 | return TX_CONTINUE; | |
990 | ||
97359d12 JB |
991 | switch (tx->key->conf.cipher) { |
992 | case WLAN_CIPHER_SUITE_WEP40: | |
993 | case WLAN_CIPHER_SUITE_WEP104: | |
e2454948 | 994 | return ieee80211_crypto_wep_encrypt(tx); |
97359d12 | 995 | case WLAN_CIPHER_SUITE_TKIP: |
e2454948 | 996 | return ieee80211_crypto_tkip_encrypt(tx); |
97359d12 | 997 | case WLAN_CIPHER_SUITE_CCMP: |
e2454948 | 998 | return ieee80211_crypto_ccmp_encrypt(tx); |
97359d12 | 999 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac | 1000 | return ieee80211_crypto_aes_cmac_encrypt(tx); |
3ffc2a90 JB |
1001 | default: |
1002 | /* handle hw-only algorithm */ | |
1003 | if (info->control.hw_key) { | |
1004 | ieee80211_tx_set_protected(tx); | |
1005 | return TX_CONTINUE; | |
1006 | } | |
1007 | break; | |
1008 | ||
e2454948 JB |
1009 | } |
1010 | ||
e2454948 JB |
1011 | return TX_DROP; |
1012 | } | |
1013 | ||
d9e8a70f | 1014 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
1015 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
1016 | { | |
2de8e0d9 JB |
1017 | struct sk_buff *skb = tx->skb; |
1018 | struct ieee80211_hdr *hdr; | |
1019 | int next_len; | |
1020 | bool group_addr; | |
03f93c3d | 1021 | |
2de8e0d9 JB |
1022 | do { |
1023 | hdr = (void *) skb->data; | |
7e0aae47 JM |
1024 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) |
1025 | break; /* must not overwrite AID */ | |
2de8e0d9 JB |
1026 | next_len = skb->next ? skb->next->len : 0; |
1027 | group_addr = is_multicast_ether_addr(hdr->addr1); | |
03f93c3d | 1028 | |
2de8e0d9 JB |
1029 | hdr->duration_id = |
1030 | ieee80211_duration(tx, group_addr, next_len); | |
1031 | } while ((skb = skb->next)); | |
03f93c3d JB |
1032 | |
1033 | return TX_CONTINUE; | |
1034 | } | |
1035 | ||
e2ebc74d JB |
1036 | /* actual transmit path */ |
1037 | ||
a622ab72 JB |
1038 | static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, |
1039 | struct sk_buff *skb, | |
1040 | struct ieee80211_tx_info *info, | |
1041 | struct tid_ampdu_tx *tid_tx, | |
1042 | int tid) | |
1043 | { | |
1044 | bool queued = false; | |
1045 | ||
1046 | if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { | |
1047 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
0ab33703 JB |
1048 | } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
1049 | /* | |
1050 | * nothing -- this aggregation session is being started | |
1051 | * but that might still fail with the driver | |
1052 | */ | |
a622ab72 JB |
1053 | } else { |
1054 | spin_lock(&tx->sta->lock); | |
1055 | /* | |
1056 | * Need to re-check now, because we may get here | |
1057 | * | |
1058 | * 1) in the window during which the setup is actually | |
1059 | * already done, but not marked yet because not all | |
1060 | * packets are spliced over to the driver pending | |
1061 | * queue yet -- if this happened we acquire the lock | |
1062 | * either before or after the splice happens, but | |
1063 | * need to recheck which of these cases happened. | |
1064 | * | |
1065 | * 2) during session teardown, if the OPERATIONAL bit | |
1066 | * was cleared due to the teardown but the pointer | |
1067 | * hasn't been assigned NULL yet (or we loaded it | |
1068 | * before it was assigned) -- in this case it may | |
1069 | * now be NULL which means we should just let the | |
1070 | * packet pass through because splicing the frames | |
1071 | * back is already done. | |
1072 | */ | |
40b275b6 | 1073 | tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); |
a622ab72 JB |
1074 | |
1075 | if (!tid_tx) { | |
1076 | /* do nothing, let packet pass through */ | |
1077 | } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { | |
1078 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
1079 | } else { | |
1080 | queued = true; | |
1081 | info->control.vif = &tx->sdata->vif; | |
1082 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1083 | __skb_queue_tail(&tid_tx->pending, skb); | |
1084 | } | |
1085 | spin_unlock(&tx->sta->lock); | |
1086 | } | |
1087 | ||
1088 | return queued; | |
1089 | } | |
1090 | ||
58d4185e JB |
1091 | /* |
1092 | * initialises @tx | |
1093 | */ | |
9ae54c84 | 1094 | static ieee80211_tx_result |
3b8d81e0 JB |
1095 | ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, |
1096 | struct ieee80211_tx_data *tx, | |
1097 | struct sk_buff *skb) | |
e2ebc74d | 1098 | { |
3b8d81e0 | 1099 | struct ieee80211_local *local = sdata->local; |
58d4185e | 1100 | struct ieee80211_hdr *hdr; |
e039fa4a | 1101 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
68f2b517 | 1102 | int tid; |
a622ab72 | 1103 | u8 *qc; |
e2ebc74d JB |
1104 | |
1105 | memset(tx, 0, sizeof(*tx)); | |
1106 | tx->skb = skb; | |
e2ebc74d | 1107 | tx->local = local; |
3b8d81e0 | 1108 | tx->sdata = sdata; |
e039fa4a | 1109 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 1110 | |
cd8ffc80 JB |
1111 | /* |
1112 | * If this flag is set to true anywhere, and we get here, | |
1113 | * we are doing the needed processing, so remove the flag | |
1114 | * now. | |
1115 | */ | |
1116 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1117 | ||
58d4185e JB |
1118 | hdr = (struct ieee80211_hdr *) skb->data; |
1119 | ||
3f0e0b22 | 1120 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
f14543ee | 1121 | tx->sta = rcu_dereference(sdata->u.vlan.sta); |
3f0e0b22 FF |
1122 | if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) |
1123 | return TX_DROP; | |
b4d57adb FF |
1124 | } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { |
1125 | tx->sta = sta_info_get_bss(sdata, hdr->addr1); | |
3f0e0b22 | 1126 | } |
f14543ee | 1127 | if (!tx->sta) |
abe60632 | 1128 | tx->sta = sta_info_get(sdata, hdr->addr1); |
58d4185e | 1129 | |
cd8ffc80 | 1130 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
49a59543 | 1131 | !ieee80211_is_qos_nullfunc(hdr->frame_control) && |
edf6b784 AN |
1132 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && |
1133 | !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { | |
cd8ffc80 JB |
1134 | struct tid_ampdu_tx *tid_tx; |
1135 | ||
8b30b1fe S |
1136 | qc = ieee80211_get_qos_ctl(hdr); |
1137 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1138 | ||
a622ab72 JB |
1139 | tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); |
1140 | if (tid_tx) { | |
1141 | bool queued; | |
cd8ffc80 | 1142 | |
a622ab72 JB |
1143 | queued = ieee80211_tx_prep_agg(tx, skb, info, |
1144 | tid_tx, tid); | |
1145 | ||
1146 | if (unlikely(queued)) | |
1147 | return TX_QUEUED; | |
1148 | } | |
8b30b1fe S |
1149 | } |
1150 | ||
badffb72 | 1151 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1152 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1153 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1154 | } else { |
5cf121c3 | 1155 | tx->flags |= IEEE80211_TX_UNICAST; |
d3707d99 JB |
1156 | if (unlikely(local->wifi_wme_noack_test)) |
1157 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
893d73f4 HS |
1158 | /* |
1159 | * Flags are initialized to 0. Hence, no need to | |
1160 | * explicitly unset IEEE80211_TX_CTL_NO_ACK since | |
1161 | * it might already be set for injected frames. | |
1162 | */ | |
badffb72 | 1163 | } |
58d4185e | 1164 | |
a26eb27a JB |
1165 | if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { |
1166 | if (!(tx->flags & IEEE80211_TX_UNICAST) || | |
1167 | skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || | |
1168 | info->flags & IEEE80211_TX_CTL_AMPDU) | |
1169 | info->flags |= IEEE80211_TX_CTL_DONTFRAG; | |
58d4185e JB |
1170 | } |
1171 | ||
e2ebc74d | 1172 | if (!tx->sta) |
e039fa4a | 1173 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
c2c98fde | 1174 | else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1175 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1176 | |
e039fa4a | 1177 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1178 | |
9ae54c84 | 1179 | return TX_CONTINUE; |
e2ebc74d JB |
1180 | } |
1181 | ||
7bb45683 JB |
1182 | /* |
1183 | * Returns false if the frame couldn't be transmitted but was queued instead. | |
1184 | */ | |
1185 | static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff **skbp, | |
1186 | struct sta_info *sta, bool txpending) | |
e2ebc74d | 1187 | { |
1870cd71 | 1188 | struct sk_buff *skb = *skbp, *next; |
f8e79ddd | 1189 | struct ieee80211_tx_info *info; |
5061b0c2 | 1190 | struct ieee80211_sub_if_data *sdata; |
3b8d81e0 | 1191 | unsigned long flags; |
7bb45683 | 1192 | int len; |
2de8e0d9 | 1193 | bool fragm = false; |
e2ebc74d | 1194 | |
2de8e0d9 | 1195 | while (skb) { |
3b8d81e0 | 1196 | int q = skb_get_queue_mapping(skb); |
e1e54068 | 1197 | __le16 fc; |
3b8d81e0 JB |
1198 | |
1199 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
3b8d81e0 | 1200 | if (local->queue_stop_reasons[q] || |
7bb45683 JB |
1201 | (!txpending && !skb_queue_empty(&local->pending[q]))) { |
1202 | /* | |
1203 | * Since queue is stopped, queue up frames for later | |
1204 | * transmission from the tx-pending tasklet when the | |
1205 | * queue is woken again. | |
1206 | */ | |
1207 | ||
1208 | do { | |
1209 | next = skb->next; | |
1210 | skb->next = NULL; | |
1211 | /* | |
1212 | * NB: If txpending is true, next must already | |
1213 | * be NULL since we must've gone through this | |
1214 | * loop before already; therefore we can just | |
1215 | * queue the frame to the head without worrying | |
1216 | * about reordering of fragments. | |
1217 | */ | |
1218 | if (unlikely(txpending)) | |
1219 | __skb_queue_head(&local->pending[q], | |
1220 | skb); | |
1221 | else | |
1222 | __skb_queue_tail(&local->pending[q], | |
1223 | skb); | |
1224 | } while ((skb = next)); | |
1225 | ||
1226 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, | |
1227 | flags); | |
1228 | return false; | |
1229 | } | |
3b8d81e0 | 1230 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
f8e79ddd | 1231 | |
f0e72851 JB |
1232 | info = IEEE80211_SKB_CB(skb); |
1233 | ||
1234 | if (fragm) | |
e6a9854b | 1235 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1236 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
f0e72851 | 1237 | |
2de8e0d9 | 1238 | next = skb->next; |
a220858d | 1239 | len = skb->len; |
5061b0c2 | 1240 | |
ad5351db JB |
1241 | if (next) |
1242 | info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; | |
1243 | ||
5061b0c2 JB |
1244 | sdata = vif_to_sdata(info->control.vif); |
1245 | ||
1246 | switch (sdata->vif.type) { | |
1247 | case NL80211_IFTYPE_MONITOR: | |
1248 | info->control.vif = NULL; | |
1249 | break; | |
1250 | case NL80211_IFTYPE_AP_VLAN: | |
1251 | info->control.vif = &container_of(sdata->bss, | |
1252 | struct ieee80211_sub_if_data, u.ap)->vif; | |
1253 | break; | |
1254 | default: | |
1255 | /* keep */ | |
1256 | break; | |
1257 | } | |
1258 | ||
ec25acc4 JB |
1259 | if (sta && sta->uploaded) |
1260 | info->control.sta = &sta->sta; | |
1261 | else | |
1262 | info->control.sta = NULL; | |
1263 | ||
e1e54068 | 1264 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
7bb45683 | 1265 | drv_tx(local, skb); |
21f5fc75 | 1266 | |
e1e54068 | 1267 | ieee80211_tpt_led_trig_tx(local, fc, len); |
1870cd71 | 1268 | *skbp = skb = next; |
2de8e0d9 JB |
1269 | ieee80211_led_tx(local, 1); |
1270 | fragm = true; | |
e2ebc74d | 1271 | } |
2de8e0d9 | 1272 | |
7bb45683 | 1273 | return true; |
e2ebc74d JB |
1274 | } |
1275 | ||
97b045d6 JB |
1276 | /* |
1277 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1278 | * frame was dropped or queued. | |
1279 | */ | |
1280 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1281 | { | |
97b045d6 | 1282 | struct sk_buff *skb = tx->skb; |
c6fcf6bc | 1283 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
97b045d6 | 1284 | ieee80211_tx_result res = TX_DROP; |
97b045d6 | 1285 | |
9aa4aee3 JB |
1286 | #define CALL_TXH(txh) \ |
1287 | do { \ | |
1288 | res = txh(tx); \ | |
1289 | if (res != TX_CONTINUE) \ | |
1290 | goto txh_done; \ | |
1291 | } while (0) | |
1292 | ||
5c1b98a5 | 1293 | CALL_TXH(ieee80211_tx_h_dynamic_ps); |
9aa4aee3 JB |
1294 | CALL_TXH(ieee80211_tx_h_check_assoc); |
1295 | CALL_TXH(ieee80211_tx_h_ps_buf); | |
a621fa4d | 1296 | CALL_TXH(ieee80211_tx_h_check_control_port_protocol); |
9aa4aee3 | 1297 | CALL_TXH(ieee80211_tx_h_select_key); |
af65cd96 JB |
1298 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) |
1299 | CALL_TXH(ieee80211_tx_h_rate_ctrl); | |
c6fcf6bc JB |
1300 | |
1301 | if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) | |
1302 | goto txh_done; | |
1303 | ||
1304 | CALL_TXH(ieee80211_tx_h_michael_mic_add); | |
9aa4aee3 JB |
1305 | CALL_TXH(ieee80211_tx_h_sequence); |
1306 | CALL_TXH(ieee80211_tx_h_fragment); | |
d9e8a70f | 1307 | /* handlers after fragment must be aware of tx info fragmentation! */ |
9aa4aee3 JB |
1308 | CALL_TXH(ieee80211_tx_h_stats); |
1309 | CALL_TXH(ieee80211_tx_h_encrypt); | |
8fd369ee AN |
1310 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) |
1311 | CALL_TXH(ieee80211_tx_h_calculate_duration); | |
d9e8a70f | 1312 | #undef CALL_TXH |
97b045d6 | 1313 | |
d9e8a70f | 1314 | txh_done: |
97b045d6 | 1315 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1316 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
2de8e0d9 JB |
1317 | while (skb) { |
1318 | struct sk_buff *next; | |
1319 | ||
1320 | next = skb->next; | |
1321 | dev_kfree_skb(skb); | |
1322 | skb = next; | |
1323 | } | |
97b045d6 JB |
1324 | return -1; |
1325 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1326 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1327 | return -1; |
1328 | } | |
1329 | ||
1330 | return 0; | |
1331 | } | |
1332 | ||
7bb45683 JB |
1333 | /* |
1334 | * Returns false if the frame couldn't be transmitted but was queued instead. | |
1335 | */ | |
1336 | static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, | |
3b8d81e0 | 1337 | struct sk_buff *skb, bool txpending) |
e2ebc74d | 1338 | { |
3b8d81e0 | 1339 | struct ieee80211_local *local = sdata->local; |
5cf121c3 | 1340 | struct ieee80211_tx_data tx; |
97b045d6 | 1341 | ieee80211_tx_result res_prepare; |
e039fa4a | 1342 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
7bb45683 | 1343 | bool result = true; |
e2ebc74d | 1344 | |
e2ebc74d JB |
1345 | if (unlikely(skb->len < 10)) { |
1346 | dev_kfree_skb(skb); | |
7bb45683 | 1347 | return true; |
e2ebc74d JB |
1348 | } |
1349 | ||
d0709a65 JB |
1350 | rcu_read_lock(); |
1351 | ||
58d4185e | 1352 | /* initialises tx */ |
3b8d81e0 | 1353 | res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); |
e2ebc74d | 1354 | |
cd8ffc80 | 1355 | if (unlikely(res_prepare == TX_DROP)) { |
e2ebc74d | 1356 | dev_kfree_skb(skb); |
7bb45683 | 1357 | goto out; |
cd8ffc80 | 1358 | } else if (unlikely(res_prepare == TX_QUEUED)) { |
7bb45683 | 1359 | goto out; |
e2ebc74d JB |
1360 | } |
1361 | ||
5cf121c3 | 1362 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1363 | info->band = tx.channel->band; |
e2ebc74d | 1364 | |
7bb45683 JB |
1365 | if (!invoke_tx_handlers(&tx)) |
1366 | result = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); | |
97b045d6 | 1367 | out: |
d4e46a3d | 1368 | rcu_read_unlock(); |
7bb45683 | 1369 | return result; |
e2ebc74d JB |
1370 | } |
1371 | ||
1372 | /* device xmit handlers */ | |
1373 | ||
3bff1865 | 1374 | static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, |
23c0752a JB |
1375 | struct sk_buff *skb, |
1376 | int head_need, bool may_encrypt) | |
1377 | { | |
3bff1865 | 1378 | struct ieee80211_local *local = sdata->local; |
23c0752a JB |
1379 | int tail_need = 0; |
1380 | ||
3bff1865 | 1381 | if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { |
23c0752a JB |
1382 | tail_need = IEEE80211_ENCRYPT_TAILROOM; |
1383 | tail_need -= skb_tailroom(skb); | |
1384 | tail_need = max_t(int, tail_need, 0); | |
1385 | } | |
1386 | ||
fc7c976d | 1387 | if (skb_cloned(skb)) |
23c0752a | 1388 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); |
4cd06a34 | 1389 | else if (head_need || tail_need) |
23c0752a | 1390 | I802_DEBUG_INC(local->tx_expand_skb_head); |
4cd06a34 FF |
1391 | else |
1392 | return 0; | |
23c0752a JB |
1393 | |
1394 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
0fb9a9ec JP |
1395 | wiphy_debug(local->hw.wiphy, |
1396 | "failed to reallocate TX buffer\n"); | |
23c0752a JB |
1397 | return -ENOMEM; |
1398 | } | |
1399 | ||
23c0752a JB |
1400 | return 0; |
1401 | } | |
1402 | ||
ce662b44 | 1403 | void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
e2ebc74d | 1404 | { |
3b8d81e0 | 1405 | struct ieee80211_local *local = sdata->local; |
e039fa4a | 1406 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1407 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d | 1408 | int headroom; |
23c0752a | 1409 | bool may_encrypt; |
e2ebc74d | 1410 | |
d84f3234 JB |
1411 | rcu_read_lock(); |
1412 | ||
3b8d81e0 | 1413 | may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); |
23c0752a | 1414 | |
3b8d81e0 | 1415 | headroom = local->tx_headroom; |
23c0752a JB |
1416 | if (may_encrypt) |
1417 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1418 | headroom -= skb_headroom(skb); | |
1419 | headroom = max_t(int, 0, headroom); | |
1420 | ||
3bff1865 | 1421 | if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { |
23c0752a | 1422 | dev_kfree_skb(skb); |
d84f3234 | 1423 | rcu_read_unlock(); |
3b8d81e0 | 1424 | return; |
e2ebc74d JB |
1425 | } |
1426 | ||
740c1aa3 | 1427 | hdr = (struct ieee80211_hdr *) skb->data; |
5061b0c2 | 1428 | info->control.vif = &sdata->vif; |
e2ebc74d | 1429 | |
cca89496 JC |
1430 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
1431 | ieee80211_is_data(hdr->frame_control) && | |
1432 | !is_multicast_ether_addr(hdr->addr1)) | |
1433 | if (mesh_nexthop_lookup(skb, sdata)) { | |
1434 | /* skb queued: don't free */ | |
d84f3234 | 1435 | rcu_read_unlock(); |
cca89496 JC |
1436 | return; |
1437 | } | |
1438 | ||
2154c81c | 1439 | ieee80211_set_qos_hdr(sdata, skb); |
3b8d81e0 | 1440 | ieee80211_tx(sdata, skb, false); |
d84f3234 | 1441 | rcu_read_unlock(); |
e2ebc74d JB |
1442 | } |
1443 | ||
73b9f03a JB |
1444 | static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) |
1445 | { | |
1446 | struct ieee80211_radiotap_iterator iterator; | |
1447 | struct ieee80211_radiotap_header *rthdr = | |
1448 | (struct ieee80211_radiotap_header *) skb->data; | |
1449 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1450 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, | |
1451 | NULL); | |
1452 | u16 txflags; | |
1453 | ||
1454 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | | |
1455 | IEEE80211_TX_CTL_DONTFRAG; | |
1456 | ||
1457 | /* | |
1458 | * for every radiotap entry that is present | |
1459 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
1460 | * entries present, or -EINVAL on error) | |
1461 | */ | |
1462 | ||
1463 | while (!ret) { | |
1464 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
1465 | ||
1466 | if (ret) | |
1467 | continue; | |
1468 | ||
1469 | /* see if this argument is something we can use */ | |
1470 | switch (iterator.this_arg_index) { | |
1471 | /* | |
1472 | * You must take care when dereferencing iterator.this_arg | |
1473 | * for multibyte types... the pointer is not aligned. Use | |
1474 | * get_unaligned((type *)iterator.this_arg) to dereference | |
1475 | * iterator.this_arg for type "type" safely on all arches. | |
1476 | */ | |
1477 | case IEEE80211_RADIOTAP_FLAGS: | |
1478 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
1479 | /* | |
1480 | * this indicates that the skb we have been | |
1481 | * handed has the 32-bit FCS CRC at the end... | |
1482 | * we should react to that by snipping it off | |
1483 | * because it will be recomputed and added | |
1484 | * on transmission | |
1485 | */ | |
1486 | if (skb->len < (iterator._max_length + FCS_LEN)) | |
1487 | return false; | |
1488 | ||
1489 | skb_trim(skb, skb->len - FCS_LEN); | |
1490 | } | |
1491 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) | |
1492 | info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; | |
1493 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) | |
1494 | info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; | |
1495 | break; | |
1496 | ||
1497 | case IEEE80211_RADIOTAP_TX_FLAGS: | |
1498 | txflags = get_unaligned_le16(iterator.this_arg); | |
1499 | if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) | |
1500 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1501 | break; | |
1502 | ||
1503 | /* | |
1504 | * Please update the file | |
1505 | * Documentation/networking/mac80211-injection.txt | |
1506 | * when parsing new fields here. | |
1507 | */ | |
1508 | ||
1509 | default: | |
1510 | break; | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
1515 | return false; | |
1516 | ||
1517 | /* | |
1518 | * remove the radiotap header | |
1519 | * iterator->_max_length was sanity-checked against | |
1520 | * skb->len by iterator init | |
1521 | */ | |
1522 | skb_pull(skb, iterator._max_length); | |
1523 | ||
1524 | return true; | |
1525 | } | |
1526 | ||
d0cf9c0d SH |
1527 | netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, |
1528 | struct net_device *dev) | |
e2ebc74d JB |
1529 | { |
1530 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
47f4d887 | 1531 | struct ieee80211_channel *chan = local->hw.conf.channel; |
e2ebc74d JB |
1532 | struct ieee80211_radiotap_header *prthdr = |
1533 | (struct ieee80211_radiotap_header *)skb->data; | |
3b8d81e0 | 1534 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
f75f5c6f | 1535 | struct ieee80211_hdr *hdr; |
5d9cf4a5 | 1536 | struct ieee80211_sub_if_data *tmp_sdata, *sdata; |
9b8a74e3 | 1537 | u16 len_rthdr; |
5d9cf4a5 | 1538 | int hdrlen; |
e2ebc74d | 1539 | |
47f4d887 LR |
1540 | /* |
1541 | * Frame injection is not allowed if beaconing is not allowed | |
1542 | * or if we need radar detection. Beaconing is usually not allowed when | |
1543 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1544 | * Passive scan is also used in world regulatory domains where | |
1545 | * your country is not known and as such it should be treated as | |
1546 | * NO TX unless the channel is explicitly allowed in which case | |
1547 | * your current regulatory domain would not have the passive scan | |
1548 | * flag. | |
1549 | * | |
1550 | * Since AP mode uses monitor interfaces to inject/TX management | |
1551 | * frames we can make AP mode the exception to this rule once it | |
1552 | * supports radar detection as its implementation can deal with | |
1553 | * radar detection by itself. We can do that later by adding a | |
1554 | * monitor flag interfaces used for AP support. | |
1555 | */ | |
1556 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | | |
1557 | IEEE80211_CHAN_PASSIVE_SCAN))) | |
1558 | goto fail; | |
1559 | ||
9b8a74e3 AG |
1560 | /* check for not even having the fixed radiotap header part */ |
1561 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1562 | goto fail; /* too short to be possibly valid */ | |
1563 | ||
1564 | /* is it a header version we can trust to find length from? */ | |
1565 | if (unlikely(prthdr->it_version)) | |
1566 | goto fail; /* only version 0 is supported */ | |
1567 | ||
1568 | /* then there must be a radiotap header with a length we can use */ | |
1569 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1570 | ||
1571 | /* does the skb contain enough to deliver on the alleged length? */ | |
1572 | if (unlikely(skb->len < len_rthdr)) | |
1573 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d | 1574 | |
e2ebc74d JB |
1575 | /* |
1576 | * fix up the pointers accounting for the radiotap | |
1577 | * header still being in there. We are being given | |
1578 | * a precooked IEEE80211 header so no need for | |
1579 | * normal processing | |
1580 | */ | |
9b8a74e3 | 1581 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1582 | /* |
9b8a74e3 AG |
1583 | * these are just fixed to the end of the rt area since we |
1584 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1585 | */ |
9b8a74e3 AG |
1586 | skb_set_network_header(skb, len_rthdr); |
1587 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1588 | |
5d9cf4a5 JB |
1589 | if (skb->len < len_rthdr + 2) |
1590 | goto fail; | |
1591 | ||
1592 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); | |
1593 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1594 | ||
1595 | if (skb->len < len_rthdr + hdrlen) | |
1596 | goto fail; | |
1597 | ||
f75f5c6f HS |
1598 | /* |
1599 | * Initialize skb->protocol if the injected frame is a data frame | |
1600 | * carrying a rfc1042 header | |
1601 | */ | |
5d9cf4a5 JB |
1602 | if (ieee80211_is_data(hdr->frame_control) && |
1603 | skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { | |
1604 | u8 *payload = (u8 *)hdr + hdrlen; | |
1605 | ||
1606 | if (compare_ether_addr(payload, rfc1042_header) == 0) | |
1607 | skb->protocol = cpu_to_be16((payload[6] << 8) | | |
1608 | payload[7]); | |
f75f5c6f HS |
1609 | } |
1610 | ||
3b8d81e0 JB |
1611 | memset(info, 0, sizeof(*info)); |
1612 | ||
5d9cf4a5 | 1613 | info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | |
73b9f03a JB |
1614 | IEEE80211_TX_CTL_INJECTED; |
1615 | ||
1616 | /* process and remove the injection radiotap header */ | |
1617 | if (!ieee80211_parse_tx_radiotap(skb)) | |
1618 | goto fail; | |
5d9cf4a5 JB |
1619 | |
1620 | rcu_read_lock(); | |
1621 | ||
1622 | /* | |
1623 | * We process outgoing injected frames that have a local address | |
1624 | * we handle as though they are non-injected frames. | |
1625 | * This code here isn't entirely correct, the local MAC address | |
1626 | * isn't always enough to find the interface to use; for proper | |
1627 | * VLAN/WDS support we will need a different mechanism (which | |
1628 | * likely isn't going to be monitor interfaces). | |
1629 | */ | |
1630 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1631 | ||
1632 | list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { | |
1633 | if (!ieee80211_sdata_running(tmp_sdata)) | |
1634 | continue; | |
1635 | if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || | |
1636 | tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || | |
1637 | tmp_sdata->vif.type == NL80211_IFTYPE_WDS) | |
1638 | continue; | |
1639 | if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) { | |
1640 | sdata = tmp_sdata; | |
1641 | break; | |
1642 | } | |
1643 | } | |
7351c6bd | 1644 | |
5d9cf4a5 JB |
1645 | ieee80211_xmit(sdata, skb); |
1646 | rcu_read_unlock(); | |
1647 | ||
e2ebc74d | 1648 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1649 | |
1650 | fail: | |
1651 | dev_kfree_skb(skb); | |
1652 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1653 | } |
1654 | ||
1655 | /** | |
1656 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1657 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1658 | * @skb: packet to be sent | |
1659 | * @dev: incoming interface | |
1660 | * | |
1661 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1662 | * not be freed, and caller is responsible for either retrying later or freeing | |
1663 | * skb). | |
1664 | * | |
1665 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1666 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1667 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1668 | * transmission (through low-level driver). | |
1669 | */ | |
d0cf9c0d SH |
1670 | netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, |
1671 | struct net_device *dev) | |
e2ebc74d | 1672 | { |
133b8226 JB |
1673 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1674 | struct ieee80211_local *local = sdata->local; | |
489ee919 | 1675 | struct ieee80211_tx_info *info; |
5b548140 | 1676 | int ret = NETDEV_TX_BUSY, head_need; |
065e9605 HH |
1677 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1678 | __le16 fc; | |
e2ebc74d | 1679 | struct ieee80211_hdr hdr; |
ff67bb86 | 1680 | struct ieee80211s_hdr mesh_hdr __maybe_unused; |
0a65169b | 1681 | struct mesh_path __maybe_unused *mppath = NULL; |
e2ebc74d JB |
1682 | const u8 *encaps_data; |
1683 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1684 | int nh_pos, h_pos; |
f14543ee | 1685 | struct sta_info *sta = NULL; |
c2c98fde | 1686 | bool wme_sta = false, authorized = false, tdls_auth = false; |
7e244707 | 1687 | struct sk_buff *tmp_skb; |
941c93cd | 1688 | bool tdls_direct = false; |
e2ebc74d | 1689 | |
e2ebc74d | 1690 | if (unlikely(skb->len < ETH_HLEN)) { |
ec634fe3 | 1691 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1692 | goto fail; |
1693 | } | |
1694 | ||
e2ebc74d JB |
1695 | /* convert Ethernet header to proper 802.11 header (based on |
1696 | * operation mode) */ | |
1697 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1698 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1699 | |
51fb61e7 | 1700 | switch (sdata->vif.type) { |
05c914fe | 1701 | case NL80211_IFTYPE_AP_VLAN: |
f14543ee | 1702 | rcu_read_lock(); |
9bc383de | 1703 | sta = rcu_dereference(sdata->u.vlan.sta); |
f14543ee FF |
1704 | if (sta) { |
1705 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); | |
1706 | /* RA TA DA SA */ | |
1707 | memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); | |
47846c9b | 1708 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
f14543ee FF |
1709 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1710 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1711 | hdrlen = 30; | |
c2c98fde JB |
1712 | authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); |
1713 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); | |
f14543ee FF |
1714 | } |
1715 | rcu_read_unlock(); | |
1716 | if (sta) | |
1717 | break; | |
1718 | /* fall through */ | |
1719 | case NL80211_IFTYPE_AP: | |
065e9605 | 1720 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1721 | /* DA BSSID SA */ |
1722 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
47846c9b | 1723 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
e2ebc74d JB |
1724 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); |
1725 | hdrlen = 24; | |
cf966838 | 1726 | break; |
05c914fe | 1727 | case NL80211_IFTYPE_WDS: |
065e9605 | 1728 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1729 | /* RA TA DA SA */ |
1730 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
47846c9b | 1731 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
e2ebc74d JB |
1732 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1733 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1734 | hdrlen = 30; | |
cf966838 | 1735 | break; |
33b64eb2 | 1736 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1737 | case NL80211_IFTYPE_MESH_POINT: |
472dbc45 | 1738 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1739 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1740 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
ec634fe3 | 1741 | ret = NETDEV_TX_OK; |
e32f85f7 | 1742 | goto fail; |
33b64eb2 | 1743 | } |
28104cae | 1744 | rcu_read_lock(); |
f76b57b4 JF |
1745 | if (!is_multicast_ether_addr(skb->data)) |
1746 | mppath = mpp_path_lookup(skb->data, sdata); | |
79617dee | 1747 | |
f76b57b4 | 1748 | /* |
9d52501b JF |
1749 | * Use address extension if it is a packet from |
1750 | * another interface or if we know the destination | |
1751 | * is being proxied by a portal (i.e. portal address | |
1752 | * differs from proxied address) | |
f76b57b4 | 1753 | */ |
47846c9b | 1754 | if (compare_ether_addr(sdata->vif.addr, |
f76b57b4 | 1755 | skb->data + ETH_ALEN) == 0 && |
9d52501b | 1756 | !(mppath && compare_ether_addr(mppath->mpp, skb->data))) { |
3c5772a5 JC |
1757 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1758 | skb->data, skb->data + ETH_ALEN); | |
28104cae | 1759 | rcu_read_unlock(); |
3c5772a5 | 1760 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, |
61ad5394 | 1761 | sdata, NULL, NULL); |
79617dee | 1762 | } else { |
3c5772a5 | 1763 | int is_mesh_mcast = 1; |
15ff6365 | 1764 | const u8 *mesh_da; |
79617dee | 1765 | |
79617dee | 1766 | if (is_multicast_ether_addr(skb->data)) |
3c5772a5 JC |
1767 | /* DA TA mSA AE:SA */ |
1768 | mesh_da = skb->data; | |
79617dee | 1769 | else { |
15ff6365 JB |
1770 | static const u8 bcast[ETH_ALEN] = |
1771 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
3c5772a5 JC |
1772 | if (mppath) { |
1773 | /* RA TA mDA mSA AE:DA SA */ | |
1774 | mesh_da = mppath->mpp; | |
1775 | is_mesh_mcast = 0; | |
15ff6365 | 1776 | } else { |
3c5772a5 | 1777 | /* DA TA mSA AE:SA */ |
15ff6365 JB |
1778 | mesh_da = bcast; |
1779 | } | |
79617dee | 1780 | } |
3c5772a5 | 1781 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
47846c9b | 1782 | mesh_da, sdata->vif.addr); |
3c5772a5 JC |
1783 | rcu_read_unlock(); |
1784 | if (is_mesh_mcast) | |
1785 | meshhdrlen = | |
1786 | ieee80211_new_mesh_header(&mesh_hdr, | |
1787 | sdata, | |
1788 | skb->data + ETH_ALEN, | |
3c5772a5 JC |
1789 | NULL); |
1790 | else | |
1791 | meshhdrlen = | |
1792 | ieee80211_new_mesh_header(&mesh_hdr, | |
1793 | sdata, | |
3c5772a5 JC |
1794 | skb->data, |
1795 | skb->data + ETH_ALEN); | |
79617dee | 1796 | |
79617dee | 1797 | } |
33b64eb2 LCC |
1798 | break; |
1799 | #endif | |
05c914fe | 1800 | case NL80211_IFTYPE_STATION: |
941c93cd | 1801 | if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { |
c2c98fde JB |
1802 | bool tdls_peer = false; |
1803 | ||
941c93cd AN |
1804 | rcu_read_lock(); |
1805 | sta = sta_info_get(sdata, skb->data); | |
c2c98fde JB |
1806 | if (sta) { |
1807 | authorized = test_sta_flag(sta, | |
1808 | WLAN_STA_AUTHORIZED); | |
1809 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); | |
1810 | tdls_peer = test_sta_flag(sta, | |
1811 | WLAN_STA_TDLS_PEER); | |
1812 | tdls_auth = test_sta_flag(sta, | |
1813 | WLAN_STA_TDLS_PEER_AUTH); | |
1814 | } | |
941c93cd AN |
1815 | rcu_read_unlock(); |
1816 | ||
1817 | /* | |
1818 | * If the TDLS link is enabled, send everything | |
1819 | * directly. Otherwise, allow TDLS setup frames | |
1820 | * to be transmitted indirectly. | |
1821 | */ | |
c2c98fde | 1822 | tdls_direct = tdls_peer && (tdls_auth || |
941c93cd AN |
1823 | !(ethertype == ETH_P_TDLS && skb->len > 14 && |
1824 | skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); | |
1825 | } | |
1826 | ||
1827 | if (tdls_direct) { | |
1828 | /* link during setup - throw out frames to peer */ | |
c2c98fde | 1829 | if (!tdls_auth) { |
941c93cd AN |
1830 | ret = NETDEV_TX_OK; |
1831 | goto fail; | |
1832 | } | |
1833 | ||
1834 | /* DA SA BSSID */ | |
1835 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1836 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1837 | memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); | |
1838 | hdrlen = 24; | |
1839 | } else if (sdata->u.mgd.use_4addr && | |
1840 | cpu_to_be16(ethertype) != sdata->control_port_protocol) { | |
1841 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | | |
1842 | IEEE80211_FCTL_TODS); | |
f14543ee | 1843 | /* RA TA DA SA */ |
941c93cd | 1844 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
47846c9b | 1845 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
f14543ee FF |
1846 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1847 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1848 | hdrlen = 30; | |
1849 | } else { | |
1850 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); | |
1851 | /* BSSID SA DA */ | |
941c93cd | 1852 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
f14543ee FF |
1853 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1854 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1855 | hdrlen = 24; | |
1856 | } | |
cf966838 | 1857 | break; |
05c914fe | 1858 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1859 | /* DA SA BSSID */ |
1860 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1861 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
46900298 | 1862 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
e2ebc74d | 1863 | hdrlen = 24; |
cf966838 JB |
1864 | break; |
1865 | default: | |
ec634fe3 | 1866 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1867 | goto fail; |
1868 | } | |
1869 | ||
7d185b8b JB |
1870 | /* |
1871 | * There's no need to try to look up the destination | |
1872 | * if it is a multicast address (which can only happen | |
1873 | * in AP mode) | |
1874 | */ | |
1875 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1876 | rcu_read_lock(); |
abe60632 | 1877 | sta = sta_info_get(sdata, hdr.addr1); |
c2c98fde JB |
1878 | if (sta) { |
1879 | authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); | |
1880 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); | |
1881 | } | |
d0709a65 | 1882 | rcu_read_unlock(); |
e2ebc74d JB |
1883 | } |
1884 | ||
4777be41 JC |
1885 | /* For mesh, the use of the QoS header is mandatory */ |
1886 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
c2c98fde | 1887 | wme_sta = true; |
4777be41 | 1888 | |
3434fbd3 | 1889 | /* receiver and we are QoS enabled, use a QoS type frame */ |
c2c98fde | 1890 | if (wme_sta && local->hw.queues >= 4) { |
065e9605 | 1891 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1892 | hdrlen += 2; |
1893 | } | |
1894 | ||
1895 | /* | |
238814fd JB |
1896 | * Drop unicast frames to unauthorised stations unless they are |
1897 | * EAPOL frames from the local station. | |
ce3edf6d | 1898 | */ |
55182e4a JB |
1899 | if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && |
1900 | !is_multicast_ether_addr(hdr.addr1) && !authorized && | |
1901 | (cpu_to_be16(ethertype) != sdata->control_port_protocol || | |
1902 | compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) { | |
ce3edf6d | 1903 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
ce3edf6d | 1904 | if (net_ratelimit()) |
0c68ae26 | 1905 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1906 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1907 | hdr.addr1); |
ce3edf6d JB |
1908 | #endif |
1909 | ||
1910 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1911 | ||
ec634fe3 | 1912 | ret = NETDEV_TX_OK; |
ce3edf6d JB |
1913 | goto fail; |
1914 | } | |
1915 | ||
7e244707 HS |
1916 | /* |
1917 | * If the skb is shared we need to obtain our own copy. | |
1918 | */ | |
1919 | if (skb_shared(skb)) { | |
1920 | tmp_skb = skb; | |
f8a0a781 | 1921 | skb = skb_clone(skb, GFP_ATOMIC); |
7e244707 HS |
1922 | kfree_skb(tmp_skb); |
1923 | ||
1924 | if (!skb) { | |
1925 | ret = NETDEV_TX_OK; | |
1926 | goto fail; | |
1927 | } | |
1928 | } | |
1929 | ||
065e9605 | 1930 | hdr.frame_control = fc; |
e2ebc74d JB |
1931 | hdr.duration_id = 0; |
1932 | hdr.seq_ctrl = 0; | |
1933 | ||
1934 | skip_header_bytes = ETH_HLEN; | |
1935 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1936 | encaps_data = bridge_tunnel_header; | |
1937 | encaps_len = sizeof(bridge_tunnel_header); | |
1938 | skip_header_bytes -= 2; | |
1939 | } else if (ethertype >= 0x600) { | |
1940 | encaps_data = rfc1042_header; | |
1941 | encaps_len = sizeof(rfc1042_header); | |
1942 | skip_header_bytes -= 2; | |
1943 | } else { | |
1944 | encaps_data = NULL; | |
1945 | encaps_len = 0; | |
1946 | } | |
1947 | ||
7e244707 HS |
1948 | nh_pos = skb_network_header(skb) - skb->data; |
1949 | h_pos = skb_transport_header(skb) - skb->data; | |
1950 | ||
e2ebc74d JB |
1951 | skb_pull(skb, skip_header_bytes); |
1952 | nh_pos -= skip_header_bytes; | |
1953 | h_pos -= skip_header_bytes; | |
1954 | ||
23c0752a | 1955 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1956 | |
23c0752a JB |
1957 | /* |
1958 | * So we need to modify the skb header and hence need a copy of | |
1959 | * that. The head_need variable above doesn't, so far, include | |
1960 | * the needed header space that we don't need right away. If we | |
1961 | * can, then we don't reallocate right now but only after the | |
1962 | * frame arrives at the master device (if it does...) | |
1963 | * | |
1964 | * If we cannot, however, then we will reallocate to include all | |
1965 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1966 | * make it big enough for everything we may ever need. | |
1967 | */ | |
e2ebc74d | 1968 | |
3a5be7d4 | 1969 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1970 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1971 | head_need += local->tx_headroom; | |
1972 | head_need = max_t(int, 0, head_need); | |
3bff1865 | 1973 | if (ieee80211_skb_resize(sdata, skb, head_need, true)) |
e2ebc74d | 1974 | goto fail; |
e2ebc74d JB |
1975 | } |
1976 | ||
1977 | if (encaps_data) { | |
1978 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1979 | nh_pos += encaps_len; | |
1980 | h_pos += encaps_len; | |
1981 | } | |
c29b9b9b | 1982 | |
e4ab7eb0 | 1983 | #ifdef CONFIG_MAC80211_MESH |
33b64eb2 LCC |
1984 | if (meshhdrlen > 0) { |
1985 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1986 | nh_pos += meshhdrlen; | |
1987 | h_pos += meshhdrlen; | |
1988 | } | |
e4ab7eb0 | 1989 | #endif |
33b64eb2 | 1990 | |
065e9605 | 1991 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1992 | __le16 *qos_control; |
1993 | ||
1994 | qos_control = (__le16*) skb_push(skb, 2); | |
1995 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1996 | /* | |
1997 | * Maybe we could actually set some fields here, for now just | |
1998 | * initialise to zero to indicate no special operation. | |
1999 | */ | |
2000 | *qos_control = 0; | |
2001 | } else | |
2002 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
2003 | ||
e2ebc74d JB |
2004 | nh_pos += hdrlen; |
2005 | h_pos += hdrlen; | |
2006 | ||
68aae116 SH |
2007 | dev->stats.tx_packets++; |
2008 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
2009 | |
2010 | /* Update skb pointers to various headers since this modified frame | |
2011 | * is going to go through Linux networking code that may potentially | |
2012 | * need things like pointer to IP header. */ | |
2013 | skb_set_mac_header(skb, 0); | |
2014 | skb_set_network_header(skb, nh_pos); | |
2015 | skb_set_transport_header(skb, h_pos); | |
2016 | ||
489ee919 | 2017 | info = IEEE80211_SKB_CB(skb); |
3b8d81e0 JB |
2018 | memset(info, 0, sizeof(*info)); |
2019 | ||
e2ebc74d | 2020 | dev->trans_start = jiffies; |
3b8d81e0 | 2021 | ieee80211_xmit(sdata, skb); |
e2ebc74d | 2022 | |
ec634fe3 | 2023 | return NETDEV_TX_OK; |
e2ebc74d JB |
2024 | |
2025 | fail: | |
ec634fe3 | 2026 | if (ret == NETDEV_TX_OK) |
e2ebc74d JB |
2027 | dev_kfree_skb(skb); |
2028 | ||
2029 | return ret; | |
2030 | } | |
2031 | ||
e2ebc74d | 2032 | |
e2530083 JB |
2033 | /* |
2034 | * ieee80211_clear_tx_pending may not be called in a context where | |
2035 | * it is possible that it packets could come in again. | |
2036 | */ | |
e2ebc74d JB |
2037 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
2038 | { | |
2de8e0d9 | 2039 | int i; |
e2ebc74d | 2040 | |
2a577d98 JB |
2041 | for (i = 0; i < local->hw.queues; i++) |
2042 | skb_queue_purge(&local->pending[i]); | |
e2ebc74d JB |
2043 | } |
2044 | ||
7bb45683 JB |
2045 | /* |
2046 | * Returns false if the frame couldn't be transmitted but was queued instead, | |
2047 | * which in this case means re-queued -- take as an indication to stop sending | |
2048 | * more pending frames. | |
2049 | */ | |
cd8ffc80 JB |
2050 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
2051 | struct sk_buff *skb) | |
2052 | { | |
2053 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2054 | struct ieee80211_sub_if_data *sdata; | |
2055 | struct sta_info *sta; | |
2056 | struct ieee80211_hdr *hdr; | |
7bb45683 | 2057 | bool result; |
cd8ffc80 | 2058 | |
5061b0c2 | 2059 | sdata = vif_to_sdata(info->control.vif); |
cd8ffc80 JB |
2060 | |
2061 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { | |
7bb45683 | 2062 | result = ieee80211_tx(sdata, skb, true); |
cd8ffc80 JB |
2063 | } else { |
2064 | hdr = (struct ieee80211_hdr *)skb->data; | |
abe60632 | 2065 | sta = sta_info_get(sdata, hdr->addr1); |
cd8ffc80 | 2066 | |
7bb45683 | 2067 | result = __ieee80211_tx(local, &skb, sta, true); |
cd8ffc80 JB |
2068 | } |
2069 | ||
cd8ffc80 JB |
2070 | return result; |
2071 | } | |
2072 | ||
e2530083 | 2073 | /* |
3b8d81e0 | 2074 | * Transmit all pending packets. Called from tasklet. |
e2530083 | 2075 | */ |
e2ebc74d JB |
2076 | void ieee80211_tx_pending(unsigned long data) |
2077 | { | |
2078 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
7236fe29 | 2079 | struct ieee80211_sub_if_data *sdata; |
2a577d98 | 2080 | unsigned long flags; |
cd8ffc80 | 2081 | int i; |
3b8d81e0 | 2082 | bool txok; |
e2ebc74d | 2083 | |
f0e72851 | 2084 | rcu_read_lock(); |
e2530083 | 2085 | |
3b8d81e0 | 2086 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
2a577d98 JB |
2087 | for (i = 0; i < local->hw.queues; i++) { |
2088 | /* | |
2089 | * If queue is stopped by something other than due to pending | |
2090 | * frames, or we have no pending frames, proceed to next queue. | |
2091 | */ | |
3b8d81e0 | 2092 | if (local->queue_stop_reasons[i] || |
2a577d98 | 2093 | skb_queue_empty(&local->pending[i])) |
e2ebc74d | 2094 | continue; |
e2530083 | 2095 | |
2a577d98 | 2096 | while (!skb_queue_empty(&local->pending[i])) { |
3b8d81e0 | 2097 | struct sk_buff *skb = __skb_dequeue(&local->pending[i]); |
5061b0c2 | 2098 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
5061b0c2 | 2099 | |
a7bc376c JB |
2100 | if (WARN_ON(!info->control.vif)) { |
2101 | kfree_skb(skb); | |
2102 | continue; | |
2103 | } | |
2104 | ||
3b8d81e0 JB |
2105 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
2106 | flags); | |
2107 | ||
2108 | txok = ieee80211_tx_pending_skb(local, skb); | |
3b8d81e0 JB |
2109 | spin_lock_irqsave(&local->queue_stop_reason_lock, |
2110 | flags); | |
2111 | if (!txok) | |
2a577d98 | 2112 | break; |
e2ebc74d | 2113 | } |
7236fe29 JB |
2114 | |
2115 | if (skb_queue_empty(&local->pending[i])) | |
2116 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
2337db8d | 2117 | netif_wake_subqueue(sdata->dev, i); |
e2ebc74d | 2118 | } |
3b8d81e0 | 2119 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
2a577d98 | 2120 | |
f0e72851 | 2121 | rcu_read_unlock(); |
e2ebc74d JB |
2122 | } |
2123 | ||
2124 | /* functions for drivers to get certain frames */ | |
2125 | ||
8e7be8da | 2126 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
2127 | struct sk_buff *skb, |
2128 | struct beacon_data *beacon) | |
e2ebc74d JB |
2129 | { |
2130 | u8 *pos, *tim; | |
2131 | int aid0 = 0; | |
2132 | int i, have_bits = 0, n1, n2; | |
2133 | ||
2134 | /* Generate bitmap for TIM only if there are any STAs in power save | |
2135 | * mode. */ | |
e2ebc74d JB |
2136 | if (atomic_read(&bss->num_sta_ps) > 0) |
2137 | /* in the hope that this is faster than | |
2138 | * checking byte-for-byte */ | |
2139 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
2140 | IEEE80211_MAX_AID+1); | |
2141 | ||
2142 | if (bss->dtim_count == 0) | |
5dfdaf58 | 2143 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
2144 | else |
2145 | bss->dtim_count--; | |
2146 | ||
2147 | tim = pos = (u8 *) skb_put(skb, 6); | |
2148 | *pos++ = WLAN_EID_TIM; | |
2149 | *pos++ = 4; | |
2150 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 2151 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
2152 | |
2153 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
2154 | aid0 = 1; | |
2155 | ||
512119b3 CL |
2156 | bss->dtim_bc_mc = aid0 == 1; |
2157 | ||
e2ebc74d JB |
2158 | if (have_bits) { |
2159 | /* Find largest even number N1 so that bits numbered 1 through | |
2160 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
2161 | * (N2 + 1) x 8 through 2007 are 0. */ | |
2162 | n1 = 0; | |
2163 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
2164 | if (bss->tim[i]) { | |
2165 | n1 = i & 0xfe; | |
2166 | break; | |
2167 | } | |
2168 | } | |
2169 | n2 = n1; | |
2170 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
2171 | if (bss->tim[i]) { | |
2172 | n2 = i; | |
2173 | break; | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | /* Bitmap control */ | |
2178 | *pos++ = n1 | aid0; | |
2179 | /* Part Virt Bitmap */ | |
2180 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
2181 | ||
2182 | tim[1] = n2 - n1 + 4; | |
2183 | skb_put(skb, n2 - n1); | |
2184 | } else { | |
2185 | *pos++ = aid0; /* Bitmap control */ | |
2186 | *pos++ = 0; /* Part Virt Bitmap */ | |
2187 | } | |
e2ebc74d JB |
2188 | } |
2189 | ||
eddcbb94 JB |
2190 | struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, |
2191 | struct ieee80211_vif *vif, | |
2192 | u16 *tim_offset, u16 *tim_length) | |
e2ebc74d JB |
2193 | { |
2194 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 2195 | struct sk_buff *skb = NULL; |
e039fa4a | 2196 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
2197 | struct ieee80211_sub_if_data *sdata = NULL; |
2198 | struct ieee80211_if_ap *ap = NULL; | |
5dfdaf58 | 2199 | struct beacon_data *beacon; |
8318d78a | 2200 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 2201 | enum ieee80211_band band = local->hw.conf.channel->band; |
e00cfce0 | 2202 | struct ieee80211_tx_rate_control txrc; |
8318d78a | 2203 | |
2e92e6f2 | 2204 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
2205 | |
2206 | rcu_read_lock(); | |
e2ebc74d | 2207 | |
32bfd35d | 2208 | sdata = vif_to_sdata(vif); |
e2ebc74d | 2209 | |
eb3e554b FF |
2210 | if (!ieee80211_sdata_running(sdata)) |
2211 | goto out; | |
2212 | ||
eddcbb94 JB |
2213 | if (tim_offset) |
2214 | *tim_offset = 0; | |
2215 | if (tim_length) | |
2216 | *tim_length = 0; | |
2217 | ||
05c914fe | 2218 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
2219 | ap = &sdata->u.ap; |
2220 | beacon = rcu_dereference(ap->beacon); | |
3ad97fbc | 2221 | if (beacon) { |
902acc78 JB |
2222 | /* |
2223 | * headroom, head length, | |
2224 | * tail length and maximum TIM length | |
2225 | */ | |
2226 | skb = dev_alloc_skb(local->tx_headroom + | |
2227 | beacon->head_len + | |
2228 | beacon->tail_len + 256); | |
2229 | if (!skb) | |
2230 | goto out; | |
33b64eb2 | 2231 | |
902acc78 JB |
2232 | skb_reserve(skb, local->tx_headroom); |
2233 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
2234 | beacon->head_len); | |
33b64eb2 | 2235 | |
d0709a65 JB |
2236 | /* |
2237 | * Not very nice, but we want to allow the driver to call | |
2238 | * ieee80211_beacon_get() as a response to the set_tim() | |
2239 | * callback. That, however, is already invoked under the | |
2240 | * sta_lock to guarantee consistent and race-free update | |
2241 | * of the tim bitmap in mac80211 and the driver. | |
2242 | */ | |
2243 | if (local->tim_in_locked_section) { | |
8e7be8da | 2244 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2245 | } else { |
2246 | unsigned long flags; | |
2247 | ||
2248 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 2249 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2250 | spin_unlock_irqrestore(&local->sta_lock, flags); |
2251 | } | |
33b64eb2 | 2252 | |
eddcbb94 JB |
2253 | if (tim_offset) |
2254 | *tim_offset = beacon->head_len; | |
2255 | if (tim_length) | |
2256 | *tim_length = skb->len - beacon->head_len; | |
2257 | ||
902acc78 JB |
2258 | if (beacon->tail) |
2259 | memcpy(skb_put(skb, beacon->tail_len), | |
2260 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
2261 | } else |
2262 | goto out; | |
05c914fe | 2263 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
46900298 | 2264 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
9d139c81 | 2265 | struct ieee80211_hdr *hdr; |
af8cdcd8 | 2266 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
33b64eb2 | 2267 | |
af8cdcd8 | 2268 | if (!presp) |
9d139c81 JB |
2269 | goto out; |
2270 | ||
af8cdcd8 | 2271 | skb = skb_copy(presp, GFP_ATOMIC); |
9d139c81 JB |
2272 | if (!skb) |
2273 | goto out; | |
2274 | ||
2275 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
2276 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2277 | IEEE80211_STYPE_BEACON); | |
902acc78 | 2278 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
2279 | struct ieee80211_mgmt *mgmt; |
2280 | u8 *pos; | |
3b69a9c5 TP |
2281 | int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + |
2282 | sizeof(mgmt->u.beacon); | |
472dbc45 | 2283 | |
ac1bd846 JB |
2284 | #ifdef CONFIG_MAC80211_MESH |
2285 | if (!sdata->u.mesh.mesh_id_len) | |
2286 | goto out; | |
2287 | #endif | |
2288 | ||
3b69a9c5 TP |
2289 | skb = dev_alloc_skb(local->tx_headroom + |
2290 | hdr_len + | |
2291 | 2 + /* NULL SSID */ | |
2292 | 2 + 8 + /* supported rates */ | |
2293 | 2 + 3 + /* DS params */ | |
2294 | 2 + (IEEE80211_MAX_SUPP_RATES - 8) + | |
176f3608 TP |
2295 | 2 + sizeof(struct ieee80211_ht_cap) + |
2296 | 2 + sizeof(struct ieee80211_ht_info) + | |
3b69a9c5 TP |
2297 | 2 + sdata->u.mesh.mesh_id_len + |
2298 | 2 + sizeof(struct ieee80211_meshconf_ie) + | |
2299 | sdata->u.mesh.ie_len); | |
902acc78 JB |
2300 | if (!skb) |
2301 | goto out; | |
2302 | ||
2303 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
3b69a9c5 TP |
2304 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
2305 | memset(mgmt, 0, hdr_len); | |
065e9605 HH |
2306 | mgmt->frame_control = |
2307 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 | 2308 | memset(mgmt->da, 0xff, ETH_ALEN); |
47846c9b JB |
2309 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
2310 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
902acc78 | 2311 | mgmt->u.beacon.beacon_int = |
57c4d7b4 | 2312 | cpu_to_le16(sdata->vif.bss_conf.beacon_int); |
082ebb0c TP |
2313 | mgmt->u.beacon.capab_info |= cpu_to_le16( |
2314 | sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); | |
902acc78 JB |
2315 | |
2316 | pos = skb_put(skb, 2); | |
2317 | *pos++ = WLAN_EID_SSID; | |
2318 | *pos++ = 0x0; | |
2319 | ||
768db343 | 2320 | if (ieee80211_add_srates_ie(&sdata->vif, skb) || |
082ebb0c | 2321 | mesh_add_ds_params_ie(skb, sdata) || |
768db343 | 2322 | ieee80211_add_ext_srates_ie(&sdata->vif, skb) || |
082ebb0c | 2323 | mesh_add_rsn_ie(skb, sdata) || |
176f3608 TP |
2324 | mesh_add_ht_cap_ie(skb, sdata) || |
2325 | mesh_add_ht_info_ie(skb, sdata) || | |
082ebb0c TP |
2326 | mesh_add_meshid_ie(skb, sdata) || |
2327 | mesh_add_meshconf_ie(skb, sdata) || | |
2328 | mesh_add_vendor_ies(skb, sdata)) { | |
2329 | pr_err("o11s: couldn't add ies!\n"); | |
2330 | goto out; | |
2331 | } | |
9d139c81 JB |
2332 | } else { |
2333 | WARN_ON(1); | |
5dfdaf58 | 2334 | goto out; |
e2ebc74d JB |
2335 | } |
2336 | ||
e039fa4a JB |
2337 | info = IEEE80211_SKB_CB(skb); |
2338 | ||
3b8d81e0 | 2339 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
e00cfce0 | 2340 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
e039fa4a | 2341 | info->band = band; |
e00cfce0 JM |
2342 | |
2343 | memset(&txrc, 0, sizeof(txrc)); | |
2344 | txrc.hw = hw; | |
2345 | txrc.sband = sband; | |
2346 | txrc.bss_conf = &sdata->vif.bss_conf; | |
2347 | txrc.skb = skb; | |
2348 | txrc.reported_rate.idx = -1; | |
37eb0b16 JM |
2349 | txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; |
2350 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) | |
2351 | txrc.max_rate_idx = -1; | |
2352 | else | |
2353 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
8f0729b1 | 2354 | txrc.bss = true; |
e00cfce0 | 2355 | rate_control_get_rate(sdata, NULL, &txrc); |
e039fa4a JB |
2356 | |
2357 | info->control.vif = vif; | |
f591fa5d | 2358 | |
a472e71b JL |
2359 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | |
2360 | IEEE80211_TX_CTL_ASSIGN_SEQ | | |
2361 | IEEE80211_TX_CTL_FIRST_FRAGMENT; | |
e6a9854b | 2362 | out: |
5dfdaf58 | 2363 | rcu_read_unlock(); |
e2ebc74d JB |
2364 | return skb; |
2365 | } | |
eddcbb94 | 2366 | EXPORT_SYMBOL(ieee80211_beacon_get_tim); |
e2ebc74d | 2367 | |
7044cc56 KV |
2368 | struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, |
2369 | struct ieee80211_vif *vif) | |
2370 | { | |
2371 | struct ieee80211_sub_if_data *sdata; | |
2372 | struct ieee80211_if_managed *ifmgd; | |
2373 | struct ieee80211_pspoll *pspoll; | |
2374 | struct ieee80211_local *local; | |
2375 | struct sk_buff *skb; | |
2376 | ||
2377 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2378 | return NULL; | |
2379 | ||
2380 | sdata = vif_to_sdata(vif); | |
2381 | ifmgd = &sdata->u.mgd; | |
2382 | local = sdata->local; | |
2383 | ||
2384 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); | |
d15b8459 | 2385 | if (!skb) |
7044cc56 | 2386 | return NULL; |
d15b8459 | 2387 | |
7044cc56 KV |
2388 | skb_reserve(skb, local->hw.extra_tx_headroom); |
2389 | ||
2390 | pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); | |
2391 | memset(pspoll, 0, sizeof(*pspoll)); | |
2392 | pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
2393 | IEEE80211_STYPE_PSPOLL); | |
2394 | pspoll->aid = cpu_to_le16(ifmgd->aid); | |
2395 | ||
2396 | /* aid in PS-Poll has its two MSBs each set to 1 */ | |
2397 | pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); | |
2398 | ||
2399 | memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); | |
2400 | memcpy(pspoll->ta, vif->addr, ETH_ALEN); | |
2401 | ||
2402 | return skb; | |
2403 | } | |
2404 | EXPORT_SYMBOL(ieee80211_pspoll_get); | |
2405 | ||
2406 | struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, | |
2407 | struct ieee80211_vif *vif) | |
2408 | { | |
2409 | struct ieee80211_hdr_3addr *nullfunc; | |
2410 | struct ieee80211_sub_if_data *sdata; | |
2411 | struct ieee80211_if_managed *ifmgd; | |
2412 | struct ieee80211_local *local; | |
2413 | struct sk_buff *skb; | |
2414 | ||
2415 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2416 | return NULL; | |
2417 | ||
2418 | sdata = vif_to_sdata(vif); | |
2419 | ifmgd = &sdata->u.mgd; | |
2420 | local = sdata->local; | |
2421 | ||
2422 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); | |
d15b8459 | 2423 | if (!skb) |
7044cc56 | 2424 | return NULL; |
d15b8459 | 2425 | |
7044cc56 KV |
2426 | skb_reserve(skb, local->hw.extra_tx_headroom); |
2427 | ||
2428 | nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, | |
2429 | sizeof(*nullfunc)); | |
2430 | memset(nullfunc, 0, sizeof(*nullfunc)); | |
2431 | nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
2432 | IEEE80211_STYPE_NULLFUNC | | |
2433 | IEEE80211_FCTL_TODS); | |
2434 | memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); | |
2435 | memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); | |
2436 | memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); | |
2437 | ||
2438 | return skb; | |
2439 | } | |
2440 | EXPORT_SYMBOL(ieee80211_nullfunc_get); | |
2441 | ||
05e54ea6 KV |
2442 | struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, |
2443 | struct ieee80211_vif *vif, | |
2444 | const u8 *ssid, size_t ssid_len, | |
2445 | const u8 *ie, size_t ie_len) | |
2446 | { | |
2447 | struct ieee80211_sub_if_data *sdata; | |
2448 | struct ieee80211_local *local; | |
2449 | struct ieee80211_hdr_3addr *hdr; | |
2450 | struct sk_buff *skb; | |
2451 | size_t ie_ssid_len; | |
2452 | u8 *pos; | |
2453 | ||
2454 | sdata = vif_to_sdata(vif); | |
2455 | local = sdata->local; | |
2456 | ie_ssid_len = 2 + ssid_len; | |
2457 | ||
2458 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + | |
2459 | ie_ssid_len + ie_len); | |
d15b8459 | 2460 | if (!skb) |
05e54ea6 | 2461 | return NULL; |
05e54ea6 KV |
2462 | |
2463 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2464 | ||
2465 | hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); | |
2466 | memset(hdr, 0, sizeof(*hdr)); | |
2467 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
2468 | IEEE80211_STYPE_PROBE_REQ); | |
2469 | memset(hdr->addr1, 0xff, ETH_ALEN); | |
2470 | memcpy(hdr->addr2, vif->addr, ETH_ALEN); | |
2471 | memset(hdr->addr3, 0xff, ETH_ALEN); | |
2472 | ||
2473 | pos = skb_put(skb, ie_ssid_len); | |
2474 | *pos++ = WLAN_EID_SSID; | |
2475 | *pos++ = ssid_len; | |
2476 | if (ssid) | |
2477 | memcpy(pos, ssid, ssid_len); | |
2478 | pos += ssid_len; | |
2479 | ||
2480 | if (ie) { | |
2481 | pos = skb_put(skb, ie_len); | |
2482 | memcpy(pos, ie, ie_len); | |
2483 | } | |
2484 | ||
2485 | return skb; | |
2486 | } | |
2487 | EXPORT_SYMBOL(ieee80211_probereq_get); | |
2488 | ||
32bfd35d | 2489 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2490 | const void *frame, size_t frame_len, |
e039fa4a | 2491 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2492 | struct ieee80211_rts *rts) |
2493 | { | |
2494 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2495 | |
065e9605 HH |
2496 | rts->frame_control = |
2497 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
2498 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2499 | frame_txctl); | |
e2ebc74d JB |
2500 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2501 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2502 | } | |
2503 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2504 | ||
32bfd35d | 2505 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2506 | const void *frame, size_t frame_len, |
e039fa4a | 2507 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2508 | struct ieee80211_cts *cts) |
2509 | { | |
2510 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2511 | |
065e9605 HH |
2512 | cts->frame_control = |
2513 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2514 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2515 | frame_len, frame_txctl); | |
e2ebc74d JB |
2516 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2517 | } | |
2518 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2519 | ||
2520 | struct sk_buff * | |
32bfd35d | 2521 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2522 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2523 | { |
2524 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2525 | struct sk_buff *skb = NULL; |
5cf121c3 | 2526 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2527 | struct ieee80211_sub_if_data *sdata; |
2528 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2529 | struct beacon_data *beacon; |
e039fa4a | 2530 | struct ieee80211_tx_info *info; |
e2ebc74d | 2531 | |
32bfd35d | 2532 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2533 | bss = &sdata->u.ap; |
5dfdaf58 | 2534 | |
5dfdaf58 JB |
2535 | rcu_read_lock(); |
2536 | beacon = rcu_dereference(bss->beacon); | |
2537 | ||
05c914fe | 2538 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2539 | goto out; |
5dfdaf58 | 2540 | |
512119b3 | 2541 | if (bss->dtim_count != 0 || !bss->dtim_bc_mc) |
747cf5e9 | 2542 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2543 | |
e2ebc74d JB |
2544 | while (1) { |
2545 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2546 | if (!skb) | |
747cf5e9 | 2547 | goto out; |
e2ebc74d JB |
2548 | local->total_ps_buffered--; |
2549 | ||
2550 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2551 | struct ieee80211_hdr *hdr = | |
2552 | (struct ieee80211_hdr *) skb->data; | |
2553 | /* more buffered multicast/broadcast frames ==> set | |
2554 | * MoreData flag in IEEE 802.11 header to inform PS | |
2555 | * STAs */ | |
2556 | hdr->frame_control |= | |
2557 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2558 | } | |
2559 | ||
3b8d81e0 | 2560 | if (!ieee80211_tx_prepare(sdata, &tx, skb)) |
e2ebc74d JB |
2561 | break; |
2562 | dev_kfree_skb_any(skb); | |
2563 | } | |
e039fa4a JB |
2564 | |
2565 | info = IEEE80211_SKB_CB(skb); | |
2566 | ||
5cf121c3 JB |
2567 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2568 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2569 | info->band = tx.channel->band; |
e2ebc74d | 2570 | |
97b045d6 | 2571 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2572 | skb = NULL; |
97b045d6 | 2573 | out: |
d0709a65 | 2574 | rcu_read_unlock(); |
e2ebc74d JB |
2575 | |
2576 | return skb; | |
2577 | } | |
2578 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); | |
3b8d81e0 | 2579 | |
62ae67be | 2580 | void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
3b8d81e0 | 2581 | { |
3b8d81e0 JB |
2582 | skb_set_mac_header(skb, 0); |
2583 | skb_set_network_header(skb, 0); | |
2584 | skb_set_transport_header(skb, 0); | |
2585 | ||
4c468fe5 AN |
2586 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ |
2587 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
2588 | skb->priority = 7; | |
cf0277e7 | 2589 | |
3d34deb6 JB |
2590 | /* |
2591 | * The other path calling ieee80211_xmit is from the tasklet, | |
2592 | * and while we can handle concurrent transmissions locking | |
2593 | * requirements are that we do not come into tx with bhs on. | |
2594 | */ | |
2595 | local_bh_disable(); | |
3b8d81e0 | 2596 | ieee80211_xmit(sdata, skb); |
3d34deb6 | 2597 | local_bh_enable(); |
3b8d81e0 | 2598 | } |