Commit | Line | Data |
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e2ebc74d JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * | |
12 | * Transmit and frame generation functions. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/etherdevice.h> | |
19 | #include <linux/bitmap.h> | |
d4e46a3d | 20 | #include <linux/rcupdate.h> |
881d966b | 21 | #include <net/net_namespace.h> |
e2ebc74d JB |
22 | #include <net/ieee80211_radiotap.h> |
23 | #include <net/cfg80211.h> | |
24 | #include <net/mac80211.h> | |
25 | #include <asm/unaligned.h> | |
26 | ||
27 | #include "ieee80211_i.h" | |
24487981 | 28 | #include "driver-ops.h" |
2c8dccc7 | 29 | #include "led.h" |
33b64eb2 | 30 | #include "mesh.h" |
e2ebc74d JB |
31 | #include "wep.h" |
32 | #include "wpa.h" | |
33 | #include "wme.h" | |
2c8dccc7 | 34 | #include "rate.h" |
e2ebc74d JB |
35 | |
36 | #define IEEE80211_TX_OK 0 | |
37 | #define IEEE80211_TX_AGAIN 1 | |
2de8e0d9 | 38 | #define IEEE80211_TX_PENDING 2 |
e2ebc74d JB |
39 | |
40 | /* misc utils */ | |
41 | ||
03f93c3d JB |
42 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
43 | int next_frag_len) | |
e2ebc74d JB |
44 | { |
45 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 46 | struct ieee80211_rate *txrate; |
e2ebc74d | 47 | struct ieee80211_local *local = tx->local; |
8318d78a | 48 | struct ieee80211_supported_band *sband; |
358c8d9d | 49 | struct ieee80211_hdr *hdr; |
e6a9854b JB |
50 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
51 | ||
52 | /* assume HW handles this */ | |
53 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) | |
54 | return 0; | |
55 | ||
56 | /* uh huh? */ | |
57 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) | |
58 | return 0; | |
e2ebc74d | 59 | |
2e92e6f2 | 60 | sband = local->hw.wiphy->bands[tx->channel->band]; |
e6a9854b | 61 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
8318d78a | 62 | |
e6a9854b | 63 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
e2ebc74d JB |
64 | |
65 | /* | |
66 | * data and mgmt (except PS Poll): | |
67 | * - during CFP: 32768 | |
68 | * - during contention period: | |
69 | * if addr1 is group address: 0 | |
70 | * if more fragments = 0 and addr1 is individual address: time to | |
71 | * transmit one ACK plus SIFS | |
72 | * if more fragments = 1 and addr1 is individual address: time to | |
73 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
74 | * | |
75 | * IEEE 802.11, 9.6: | |
76 | * - control response frame (CTS or ACK) shall be transmitted using the | |
77 | * same rate as the immediately previous frame in the frame exchange | |
78 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
79 | * at the highest possible rate belonging to the PHY rates in the | |
80 | * BSSBasicRateSet | |
81 | */ | |
358c8d9d HH |
82 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
83 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d | 84 | /* TODO: These control frames are not currently sent by |
ccd7b362 | 85 | * mac80211, but should they be implemented, this function |
e2ebc74d JB |
86 | * needs to be updated to support duration field calculation. |
87 | * | |
88 | * RTS: time needed to transmit pending data/mgmt frame plus | |
89 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
90 | * CTS: duration of immediately previous RTS minus time | |
91 | * required to transmit CTS and its SIFS | |
92 | * ACK: 0 if immediately previous directed data/mgmt had | |
93 | * more=0, with more=1 duration in ACK frame is duration | |
94 | * from previous frame minus time needed to transmit ACK | |
95 | * and its SIFS | |
96 | * PS Poll: BIT(15) | BIT(14) | aid | |
97 | */ | |
98 | return 0; | |
99 | } | |
100 | ||
101 | /* data/mgmt */ | |
102 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 103 | return cpu_to_le16(32768); |
e2ebc74d JB |
104 | |
105 | if (group_addr) /* Group address as the destination - no ACK */ | |
106 | return 0; | |
107 | ||
108 | /* Individual destination address: | |
109 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
110 | * CTS and ACK frames shall be transmitted using the highest rate in | |
111 | * basic rate set that is less than or equal to the rate of the | |
112 | * immediately previous frame and that is using the same modulation | |
113 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
114 | * the highest mandatory rate of the PHY that is less than or equal to | |
115 | * the rate of the previous frame is used. | |
116 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
117 | */ | |
118 | rate = -1; | |
8318d78a JB |
119 | /* use lowest available if everything fails */ |
120 | mrate = sband->bitrates[0].bitrate; | |
121 | for (i = 0; i < sband->n_bitrates; i++) { | |
122 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 123 | |
8318d78a JB |
124 | if (r->bitrate > txrate->bitrate) |
125 | break; | |
e2ebc74d | 126 | |
bda3933a | 127 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
8318d78a JB |
128 | rate = r->bitrate; |
129 | ||
130 | switch (sband->band) { | |
131 | case IEEE80211_BAND_2GHZ: { | |
132 | u32 flag; | |
133 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
134 | flag = IEEE80211_RATE_MANDATORY_G; | |
135 | else | |
136 | flag = IEEE80211_RATE_MANDATORY_B; | |
137 | if (r->flags & flag) | |
138 | mrate = r->bitrate; | |
139 | break; | |
140 | } | |
141 | case IEEE80211_BAND_5GHZ: | |
142 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
143 | mrate = r->bitrate; | |
144 | break; | |
145 | case IEEE80211_NUM_BANDS: | |
146 | WARN_ON(1); | |
147 | break; | |
148 | } | |
e2ebc74d JB |
149 | } |
150 | if (rate == -1) { | |
151 | /* No matching basic rate found; use highest suitable mandatory | |
152 | * PHY rate */ | |
153 | rate = mrate; | |
154 | } | |
155 | ||
156 | /* Time needed to transmit ACK | |
157 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
158 | * to closest integer */ | |
159 | ||
160 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
bda3933a | 161 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
162 | |
163 | if (next_frag_len) { | |
164 | /* Frame is fragmented: duration increases with time needed to | |
165 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
166 | dur *= 2; /* ACK + SIFS */ | |
167 | /* next fragment */ | |
168 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 169 | txrate->bitrate, erp, |
bda3933a | 170 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
171 | } |
172 | ||
03f93c3d | 173 | return cpu_to_le16(dur); |
e2ebc74d JB |
174 | } |
175 | ||
133b8226 JB |
176 | static int inline is_ieee80211_device(struct ieee80211_local *local, |
177 | struct net_device *dev) | |
e2ebc74d | 178 | { |
133b8226 | 179 | return local == wdev_priv(dev->ieee80211_ptr); |
e2ebc74d JB |
180 | } |
181 | ||
182 | /* tx handlers */ | |
183 | ||
d9e8a70f | 184 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 185 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 186 | { |
358c8d9d | 187 | |
e039fa4a | 188 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 189 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
190 | u32 sta_flags; |
191 | ||
e039fa4a | 192 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 193 | return TX_CONTINUE; |
58d4185e | 194 | |
142b9f50 | 195 | if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) && |
a9a6ffff KV |
196 | !ieee80211_is_probe_req(hdr->frame_control) && |
197 | !ieee80211_is_nullfunc(hdr->frame_control)) | |
198 | /* | |
199 | * When software scanning only nullfunc frames (to notify | |
200 | * the sleep state to the AP) and probe requests (for the | |
201 | * active scan) are allowed, all other frames should not be | |
202 | * sent and we should not get here, but if we do | |
203 | * nonetheless, drop them to avoid sending them | |
204 | * off-channel. See the link below and | |
205 | * ieee80211_start_scan() for more. | |
206 | * | |
207 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 | |
208 | */ | |
9ae54c84 | 209 | return TX_DROP; |
e2ebc74d | 210 | |
05c914fe | 211 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
212 | return TX_CONTINUE; |
213 | ||
5cf121c3 | 214 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 215 | return TX_CONTINUE; |
e2ebc74d | 216 | |
07346f81 | 217 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 218 | |
5cf121c3 | 219 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 220 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 221 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 222 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
223 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
224 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 JB |
225 | "associated station %pM\n", |
226 | tx->dev->name, hdr->addr1); | |
e2ebc74d JB |
227 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
228 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 229 | return TX_DROP; |
e2ebc74d JB |
230 | } |
231 | } else { | |
358c8d9d | 232 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 233 | tx->local->num_sta == 0 && |
05c914fe | 234 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
235 | /* |
236 | * No associated STAs - no need to send multicast | |
237 | * frames. | |
238 | */ | |
9ae54c84 | 239 | return TX_DROP; |
e2ebc74d | 240 | } |
9ae54c84 | 241 | return TX_CONTINUE; |
e2ebc74d JB |
242 | } |
243 | ||
9ae54c84 | 244 | return TX_CONTINUE; |
e2ebc74d JB |
245 | } |
246 | ||
e2ebc74d JB |
247 | /* This function is called whenever the AP is about to exceed the maximum limit |
248 | * of buffered frames for power saving STAs. This situation should not really | |
249 | * happen often during normal operation, so dropping the oldest buffered packet | |
250 | * from each queue should be OK to make some room for new frames. */ | |
251 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
252 | { | |
253 | int total = 0, purged = 0; | |
254 | struct sk_buff *skb; | |
255 | struct ieee80211_sub_if_data *sdata; | |
256 | struct sta_info *sta; | |
257 | ||
79010420 JB |
258 | /* |
259 | * virtual interfaces are protected by RCU | |
260 | */ | |
261 | rcu_read_lock(); | |
262 | ||
263 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 264 | struct ieee80211_if_ap *ap; |
05c914fe | 265 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
266 | continue; |
267 | ap = &sdata->u.ap; | |
268 | skb = skb_dequeue(&ap->ps_bc_buf); | |
269 | if (skb) { | |
270 | purged++; | |
271 | dev_kfree_skb(skb); | |
272 | } | |
273 | total += skb_queue_len(&ap->ps_bc_buf); | |
274 | } | |
e2ebc74d | 275 | |
d0709a65 | 276 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
277 | skb = skb_dequeue(&sta->ps_tx_buf); |
278 | if (skb) { | |
279 | purged++; | |
280 | dev_kfree_skb(skb); | |
281 | } | |
282 | total += skb_queue_len(&sta->ps_tx_buf); | |
283 | } | |
d0709a65 JB |
284 | |
285 | rcu_read_unlock(); | |
e2ebc74d JB |
286 | |
287 | local->total_ps_buffered = total; | |
54223995 | 288 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 289 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 290 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 291 | #endif |
e2ebc74d JB |
292 | } |
293 | ||
9ae54c84 | 294 | static ieee80211_tx_result |
5cf121c3 | 295 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 296 | { |
e039fa4a | 297 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 298 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 299 | |
7d54d0dd JB |
300 | /* |
301 | * broadcast/multicast frame | |
302 | * | |
303 | * If any of the associated stations is in power save mode, | |
304 | * the frame is buffered to be sent after DTIM beacon frame. | |
305 | * This is done either by the hardware or us. | |
306 | */ | |
307 | ||
3e122be0 JB |
308 | /* powersaving STAs only in AP/VLAN mode */ |
309 | if (!tx->sdata->bss) | |
310 | return TX_CONTINUE; | |
311 | ||
312 | /* no buffering for ordered frames */ | |
358c8d9d | 313 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 314 | return TX_CONTINUE; |
7d54d0dd JB |
315 | |
316 | /* no stations in PS mode */ | |
317 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 318 | return TX_CONTINUE; |
7d54d0dd | 319 | |
62b1208e JB |
320 | /* buffered in hardware */ |
321 | if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) { | |
322 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; | |
323 | ||
324 | return TX_CONTINUE; | |
325 | } | |
326 | ||
7d54d0dd | 327 | /* buffered in mac80211 */ |
62b1208e JB |
328 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
329 | purge_old_ps_buffers(tx->local); | |
330 | ||
331 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { | |
54223995 | 332 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
62b1208e JB |
333 | if (net_ratelimit()) |
334 | printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", | |
335 | tx->dev->name); | |
f4ea83dd | 336 | #endif |
62b1208e JB |
337 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
338 | } else | |
339 | tx->local->total_ps_buffered++; | |
e2ebc74d | 340 | |
62b1208e | 341 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); |
7d54d0dd | 342 | |
62b1208e | 343 | return TX_QUEUED; |
e2ebc74d JB |
344 | } |
345 | ||
fb733336 JM |
346 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
347 | struct sk_buff *skb) | |
348 | { | |
349 | if (!ieee80211_is_mgmt(fc)) | |
350 | return 0; | |
351 | ||
352 | if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) | |
353 | return 0; | |
354 | ||
355 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) | |
356 | skb->data)) | |
357 | return 0; | |
358 | ||
359 | return 1; | |
360 | } | |
361 | ||
9ae54c84 | 362 | static ieee80211_tx_result |
5cf121c3 | 363 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
364 | { |
365 | struct sta_info *sta = tx->sta; | |
e039fa4a | 366 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 367 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
07346f81 | 368 | u32 staflags; |
e2ebc74d | 369 | |
358c8d9d | 370 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control))) |
9ae54c84 | 371 | return TX_CONTINUE; |
e2ebc74d | 372 | |
07346f81 JB |
373 | staflags = get_sta_flags(sta); |
374 | ||
375 | if (unlikely((staflags & WLAN_STA_PS) && | |
3fa52056 | 376 | !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) { |
e2ebc74d | 377 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 378 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
e2ebc74d | 379 | "before %d)\n", |
0c68ae26 | 380 | sta->sta.addr, sta->sta.aid, |
e2ebc74d JB |
381 | skb_queue_len(&sta->ps_tx_buf)); |
382 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
383 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
384 | purge_old_ps_buffers(tx->local); | |
385 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
386 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 387 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 388 | if (net_ratelimit()) { |
0c68ae26 | 389 | printk(KERN_DEBUG "%s: STA %pM TX " |
e2ebc74d | 390 | "buffer full - dropping oldest frame\n", |
0c68ae26 | 391 | tx->dev->name, sta->sta.addr); |
e2ebc74d | 392 | } |
f4ea83dd | 393 | #endif |
e2ebc74d JB |
394 | dev_kfree_skb(old); |
395 | } else | |
396 | tx->local->total_ps_buffered++; | |
004c872e | 397 | |
e2ebc74d | 398 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
399 | if (skb_queue_empty(&sta->ps_tx_buf)) |
400 | sta_info_set_tim_bit(sta); | |
401 | ||
e039fa4a | 402 | info->control.jiffies = jiffies; |
5061b0c2 | 403 | info->control.vif = &tx->sdata->vif; |
8f77f384 | 404 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
e2ebc74d | 405 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 406 | return TX_QUEUED; |
e2ebc74d JB |
407 | } |
408 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 409 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0c68ae26 | 410 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
e2ebc74d | 411 | "set -> send frame\n", tx->dev->name, |
0c68ae26 | 412 | sta->sta.addr); |
e2ebc74d JB |
413 | } |
414 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d | 415 | |
9ae54c84 | 416 | return TX_CONTINUE; |
e2ebc74d JB |
417 | } |
418 | ||
d9e8a70f | 419 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 420 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 421 | { |
5cf121c3 | 422 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 423 | return TX_CONTINUE; |
e2ebc74d | 424 | |
5cf121c3 | 425 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
426 | return ieee80211_tx_h_unicast_ps_buf(tx); |
427 | else | |
428 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
429 | } | |
430 | ||
d9e8a70f | 431 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 432 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 433 | { |
d3feaf5a | 434 | struct ieee80211_key *key = NULL; |
e039fa4a | 435 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 436 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 437 | |
3b8d81e0 | 438 | if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) |
e2ebc74d | 439 | tx->key = NULL; |
d4e46a3d JB |
440 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
441 | tx->key = key; | |
3cfcf6ac JM |
442 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
443 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) | |
444 | tx->key = key; | |
d4e46a3d JB |
445 | else if ((key = rcu_dereference(tx->sdata->default_key))) |
446 | tx->key = key; | |
e2ebc74d | 447 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 448 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e0463f50 JM |
449 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
450 | (!ieee80211_is_robust_mgmt_frame(hdr) || | |
451 | (ieee80211_is_action(hdr->frame_control) && | |
452 | tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { | |
e2ebc74d | 453 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 454 | return TX_DROP; |
176e4f84 | 455 | } else |
e2ebc74d JB |
456 | tx->key = NULL; |
457 | ||
458 | if (tx->key) { | |
459 | tx->key->tx_rx_count++; | |
011bfcc4 | 460 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
461 | |
462 | switch (tx->key->conf.alg) { | |
463 | case ALG_WEP: | |
358c8d9d | 464 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
465 | break; |
466 | case ALG_TKIP: | |
358c8d9d | 467 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
468 | tx->key = NULL; |
469 | break; | |
fb733336 JM |
470 | case ALG_CCMP: |
471 | if (!ieee80211_is_data_present(hdr->frame_control) && | |
472 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
473 | tx->skb)) | |
474 | tx->key = NULL; | |
475 | break; | |
3cfcf6ac JM |
476 | case ALG_AES_CMAC: |
477 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
478 | tx->key = NULL; | |
479 | break; | |
176e4f84 | 480 | } |
e2ebc74d JB |
481 | } |
482 | ||
176e4f84 | 483 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
3b8d81e0 | 484 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
176e4f84 | 485 | |
9ae54c84 | 486 | return TX_CONTINUE; |
e2ebc74d JB |
487 | } |
488 | ||
d9e8a70f | 489 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 490 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 491 | { |
e039fa4a | 492 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
493 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
494 | struct ieee80211_supported_band *sband; | |
495 | struct ieee80211_rate *rate; | |
496 | int i, len; | |
497 | bool inval = false, rts = false, short_preamble = false; | |
498 | struct ieee80211_tx_rate_control txrc; | |
b770b43e | 499 | u32 sta_flags; |
8318d78a | 500 | |
e6a9854b | 501 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 502 | |
e6a9854b | 503 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 504 | |
e6a9854b | 505 | len = min_t(int, tx->skb->len + FCS_LEN, |
b9a5f8ca | 506 | tx->local->hw.wiphy->frag_threshold); |
e6a9854b JB |
507 | |
508 | /* set up the tx rate control struct we give the RC algo */ | |
509 | txrc.hw = local_to_hw(tx->local); | |
510 | txrc.sband = sband; | |
511 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
512 | txrc.skb = tx->skb; | |
513 | txrc.reported_rate.idx = -1; | |
514 | txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx; | |
515 | ||
516 | /* set up RTS protection if desired */ | |
b9a5f8ca | 517 | if (len > tx->local->hw.wiphy->rts_threshold) { |
e6a9854b | 518 | txrc.rts = rts = true; |
e2ebc74d | 519 | } |
e2ebc74d | 520 | |
e6a9854b JB |
521 | /* |
522 | * Use short preamble if the BSS can handle it, but not for | |
523 | * management frames unless we know the receiver can handle | |
524 | * that -- the management frame might be to a station that | |
525 | * just wants a probe response. | |
526 | */ | |
527 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
528 | (ieee80211_is_data(hdr->frame_control) || | |
529 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
530 | txrc.short_preamble = short_preamble = true; | |
e2ebc74d | 531 | |
b770b43e LR |
532 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
533 | ||
534 | /* | |
535 | * Lets not bother rate control if we're associated and cannot | |
536 | * talk to the sta. This should not happen. | |
537 | */ | |
fbe9c429 | 538 | if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && |
b770b43e LR |
539 | (sta_flags & WLAN_STA_ASSOC) && |
540 | !rate_usable_index_exists(sband, &tx->sta->sta), | |
541 | "%s: Dropped data frame as no usable bitrate found while " | |
542 | "scanning and associated. Target station: " | |
543 | "%pM on %d GHz band\n", | |
544 | tx->dev->name, hdr->addr1, | |
545 | tx->channel->band ? 5 : 2)) | |
546 | return TX_DROP; | |
2e92e6f2 | 547 | |
b770b43e LR |
548 | /* |
549 | * If we're associated with the sta at this point we know we can at | |
550 | * least send the frame at the lowest bit rate. | |
551 | */ | |
e6a9854b JB |
552 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
553 | ||
554 | if (unlikely(info->control.rates[0].idx < 0)) | |
555 | return TX_DROP; | |
556 | ||
557 | if (txrc.reported_rate.idx < 0) | |
558 | txrc.reported_rate = info->control.rates[0]; | |
e2ebc74d | 559 | |
e039fa4a | 560 | if (tx->sta) |
e6a9854b | 561 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 562 | |
e6a9854b JB |
563 | if (unlikely(!info->control.rates[0].count)) |
564 | info->control.rates[0].count = 1; | |
e2ebc74d | 565 | |
9955151d GS |
566 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && |
567 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) | |
568 | info->control.rates[0].count = 1; | |
569 | ||
e6a9854b JB |
570 | if (is_multicast_ether_addr(hdr->addr1)) { |
571 | /* | |
572 | * XXX: verify the rate is in the basic rateset | |
573 | */ | |
574 | return TX_CONTINUE; | |
e2ebc74d JB |
575 | } |
576 | ||
e6a9854b JB |
577 | /* |
578 | * set up the RTS/CTS rate as the fastest basic rate | |
579 | * that is not faster than the data rate | |
580 | * | |
581 | * XXX: Should this check all retry rates? | |
582 | */ | |
583 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
584 | s8 baserate = 0; | |
585 | ||
586 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
587 | ||
588 | for (i = 0; i < sband->n_bitrates; i++) { | |
589 | /* must be a basic rate */ | |
590 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
591 | continue; | |
592 | /* must not be faster than the data rate */ | |
593 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
594 | continue; | |
595 | /* maximum */ | |
596 | if (sband->bitrates[baserate].bitrate < | |
597 | sband->bitrates[i].bitrate) | |
598 | baserate = i; | |
599 | } | |
600 | ||
601 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
602 | } |
603 | ||
e6a9854b JB |
604 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
605 | /* | |
606 | * make sure there's no valid rate following | |
607 | * an invalid one, just in case drivers don't | |
608 | * take the API seriously to stop at -1. | |
609 | */ | |
610 | if (inval) { | |
611 | info->control.rates[i].idx = -1; | |
612 | continue; | |
613 | } | |
614 | if (info->control.rates[i].idx < 0) { | |
615 | inval = true; | |
616 | continue; | |
617 | } | |
8318d78a | 618 | |
e6a9854b JB |
619 | /* |
620 | * For now assume MCS is already set up correctly, this | |
621 | * needs to be fixed. | |
622 | */ | |
623 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
624 | WARN_ON(info->control.rates[i].idx > 76); | |
625 | continue; | |
626 | } | |
e2ebc74d | 627 | |
e6a9854b JB |
628 | /* set up RTS protection if desired */ |
629 | if (rts) | |
630 | info->control.rates[i].flags |= | |
631 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 632 | |
e6a9854b | 633 | /* RC is busted */ |
075cbc9e S |
634 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
635 | sband->n_bitrates)) { | |
e6a9854b JB |
636 | info->control.rates[i].idx = -1; |
637 | continue; | |
8318d78a | 638 | } |
e2ebc74d | 639 | |
e6a9854b JB |
640 | rate = &sband->bitrates[info->control.rates[i].idx]; |
641 | ||
642 | /* set up short preamble */ | |
643 | if (short_preamble && | |
644 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
645 | info->control.rates[i].flags |= | |
646 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
647 | ||
648 | /* set up G protection */ | |
649 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
650 | rate->flags & IEEE80211_RATE_ERP_G) | |
651 | info->control.rates[i].flags |= | |
652 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
653 | } |
654 | ||
e6a9854b JB |
655 | return TX_CONTINUE; |
656 | } | |
657 | ||
658 | static ieee80211_tx_result debug_noinline | |
659 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) | |
660 | { | |
661 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
662 | ||
e2454948 | 663 | if (tx->sta) |
17741cdc | 664 | info->control.sta = &tx->sta->sta; |
e2454948 JB |
665 | |
666 | return TX_CONTINUE; | |
667 | } | |
668 | ||
f591fa5d JB |
669 | static ieee80211_tx_result debug_noinline |
670 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
671 | { | |
672 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
673 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
674 | u16 *seq; | |
675 | u8 *qc; | |
676 | int tid; | |
677 | ||
25d834e1 JB |
678 | /* |
679 | * Packet injection may want to control the sequence | |
680 | * number, if we have no matching interface then we | |
681 | * neither assign one ourselves nor ask the driver to. | |
682 | */ | |
5061b0c2 | 683 | if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) |
25d834e1 JB |
684 | return TX_CONTINUE; |
685 | ||
f591fa5d JB |
686 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
687 | return TX_CONTINUE; | |
688 | ||
689 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
690 | return TX_CONTINUE; | |
691 | ||
94778280 JB |
692 | /* |
693 | * Anything but QoS data that has a sequence number field | |
694 | * (is long enough) gets a sequence number from the global | |
695 | * counter. | |
696 | */ | |
f591fa5d | 697 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 698 | /* driver should assign sequence number */ |
f591fa5d | 699 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
700 | /* for pure STA mode without beacons, we can do it */ |
701 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
702 | tx->sdata->sequence_number += 0x10; | |
f591fa5d JB |
703 | return TX_CONTINUE; |
704 | } | |
705 | ||
706 | /* | |
707 | * This should be true for injected/management frames only, for | |
708 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
709 | * above since they are not QoS-data frames. | |
710 | */ | |
711 | if (!tx->sta) | |
712 | return TX_CONTINUE; | |
713 | ||
714 | /* include per-STA, per-TID sequence counter */ | |
715 | ||
716 | qc = ieee80211_get_qos_ctl(hdr); | |
717 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
718 | seq = &tx->sta->tid_seq[tid]; | |
719 | ||
720 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
721 | ||
722 | /* Increase the sequence number. */ | |
723 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
724 | ||
725 | return TX_CONTINUE; | |
726 | } | |
727 | ||
2de8e0d9 JB |
728 | static int ieee80211_fragment(struct ieee80211_local *local, |
729 | struct sk_buff *skb, int hdrlen, | |
730 | int frag_threshold) | |
731 | { | |
732 | struct sk_buff *tail = skb, *tmp; | |
733 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
734 | int pos = hdrlen + per_fragm; | |
735 | int rem = skb->len - hdrlen - per_fragm; | |
736 | ||
737 | if (WARN_ON(rem < 0)) | |
738 | return -EINVAL; | |
739 | ||
740 | while (rem) { | |
741 | int fraglen = per_fragm; | |
742 | ||
743 | if (fraglen > rem) | |
744 | fraglen = rem; | |
745 | rem -= fraglen; | |
746 | tmp = dev_alloc_skb(local->tx_headroom + | |
747 | frag_threshold + | |
748 | IEEE80211_ENCRYPT_HEADROOM + | |
749 | IEEE80211_ENCRYPT_TAILROOM); | |
750 | if (!tmp) | |
751 | return -ENOMEM; | |
752 | tail->next = tmp; | |
753 | tail = tmp; | |
754 | skb_reserve(tmp, local->tx_headroom + | |
755 | IEEE80211_ENCRYPT_HEADROOM); | |
756 | /* copy control information */ | |
757 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); | |
758 | skb_copy_queue_mapping(tmp, skb); | |
759 | tmp->priority = skb->priority; | |
2de8e0d9 | 760 | tmp->dev = skb->dev; |
2de8e0d9 JB |
761 | |
762 | /* copy header and data */ | |
763 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); | |
764 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); | |
765 | ||
766 | pos += fraglen; | |
767 | } | |
768 | ||
769 | skb->len = hdrlen + per_fragm; | |
770 | return 0; | |
771 | } | |
772 | ||
d9e8a70f | 773 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
774 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
775 | { | |
2de8e0d9 JB |
776 | struct sk_buff *skb = tx->skb; |
777 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
778 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
b9a5f8ca | 779 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; |
2de8e0d9 JB |
780 | int hdrlen; |
781 | int fragnum; | |
e2454948 JB |
782 | |
783 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
784 | return TX_CONTINUE; | |
785 | ||
eefce91a JB |
786 | /* |
787 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
3b8d81e0 | 788 | * This scenario is handled in ieee80211_tx_prepare but extra |
8d5e0d58 | 789 | * caution taken here as fragmented ampdu may cause Tx stop. |
eefce91a | 790 | */ |
8b30b1fe | 791 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
792 | return TX_DROP; |
793 | ||
065e9605 | 794 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 | 795 | |
2de8e0d9 | 796 | /* internal error, why is TX_FRAGMENTED set? */ |
8ccd8f21 | 797 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) |
2de8e0d9 | 798 | return TX_DROP; |
e6a9854b | 799 | |
2de8e0d9 JB |
800 | /* |
801 | * Now fragment the frame. This will allocate all the fragments and | |
802 | * chain them (using skb as the first fragment) to skb->next. | |
803 | * During transmission, we will remove the successfully transmitted | |
804 | * fragments from this list. When the low-level driver rejects one | |
805 | * of the fragments then we will simply pretend to accept the skb | |
806 | * but store it away as pending. | |
807 | */ | |
808 | if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) | |
809 | return TX_DROP; | |
e6a9854b | 810 | |
2de8e0d9 JB |
811 | /* update duration/seq/flags of fragments */ |
812 | fragnum = 0; | |
813 | do { | |
814 | int next_len; | |
815 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
e6a9854b | 816 | |
2de8e0d9 JB |
817 | hdr = (void *)skb->data; |
818 | info = IEEE80211_SKB_CB(skb); | |
e6a9854b | 819 | |
2de8e0d9 JB |
820 | if (skb->next) { |
821 | hdr->frame_control |= morefrags; | |
822 | next_len = skb->next->len; | |
e6a9854b JB |
823 | /* |
824 | * No multi-rate retries for fragmented frames, that | |
825 | * would completely throw off the NAV at other STAs. | |
826 | */ | |
827 | info->control.rates[1].idx = -1; | |
828 | info->control.rates[2].idx = -1; | |
829 | info->control.rates[3].idx = -1; | |
830 | info->control.rates[4].idx = -1; | |
831 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
832 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
2de8e0d9 JB |
833 | } else { |
834 | hdr->frame_control &= ~morefrags; | |
835 | next_len = 0; | |
e6a9854b | 836 | } |
2de8e0d9 JB |
837 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); |
838 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); | |
839 | fragnum++; | |
840 | } while ((skb = skb->next)); | |
e2ebc74d | 841 | |
9ae54c84 | 842 | return TX_CONTINUE; |
e2ebc74d JB |
843 | } |
844 | ||
feff1f2f JB |
845 | static ieee80211_tx_result debug_noinline |
846 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) | |
847 | { | |
848 | struct sk_buff *skb = tx->skb; | |
849 | ||
850 | if (!tx->sta) | |
851 | return TX_CONTINUE; | |
852 | ||
853 | tx->sta->tx_packets++; | |
854 | do { | |
855 | tx->sta->tx_fragments++; | |
856 | tx->sta->tx_bytes += skb->len; | |
857 | } while ((skb = skb->next)); | |
858 | ||
859 | return TX_CONTINUE; | |
860 | } | |
861 | ||
d9e8a70f | 862 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
863 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
864 | { | |
865 | if (!tx->key) | |
866 | return TX_CONTINUE; | |
867 | ||
868 | switch (tx->key->conf.alg) { | |
869 | case ALG_WEP: | |
870 | return ieee80211_crypto_wep_encrypt(tx); | |
871 | case ALG_TKIP: | |
872 | return ieee80211_crypto_tkip_encrypt(tx); | |
873 | case ALG_CCMP: | |
874 | return ieee80211_crypto_ccmp_encrypt(tx); | |
3cfcf6ac JM |
875 | case ALG_AES_CMAC: |
876 | return ieee80211_crypto_aes_cmac_encrypt(tx); | |
e2454948 JB |
877 | } |
878 | ||
879 | /* not reached */ | |
880 | WARN_ON(1); | |
881 | return TX_DROP; | |
882 | } | |
883 | ||
d9e8a70f | 884 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
885 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
886 | { | |
2de8e0d9 JB |
887 | struct sk_buff *skb = tx->skb; |
888 | struct ieee80211_hdr *hdr; | |
889 | int next_len; | |
890 | bool group_addr; | |
03f93c3d | 891 | |
2de8e0d9 JB |
892 | do { |
893 | hdr = (void *) skb->data; | |
7e0aae47 JM |
894 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) |
895 | break; /* must not overwrite AID */ | |
2de8e0d9 JB |
896 | next_len = skb->next ? skb->next->len : 0; |
897 | group_addr = is_multicast_ether_addr(hdr->addr1); | |
03f93c3d | 898 | |
2de8e0d9 JB |
899 | hdr->duration_id = |
900 | ieee80211_duration(tx, group_addr, next_len); | |
901 | } while ((skb = skb->next)); | |
03f93c3d JB |
902 | |
903 | return TX_CONTINUE; | |
904 | } | |
905 | ||
e2ebc74d JB |
906 | /* actual transmit path */ |
907 | ||
908 | /* | |
909 | * deal with packet injection down monitor interface | |
910 | * with Radiotap Header -- only called for monitor mode interface | |
911 | */ | |
27004b10 JB |
912 | static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
913 | struct sk_buff *skb) | |
e2ebc74d JB |
914 | { |
915 | /* | |
916 | * this is the moment to interpret and discard the radiotap header that | |
917 | * must be at the start of the packet injected in Monitor mode | |
918 | * | |
919 | * Need to take some care with endian-ness since radiotap | |
920 | * args are little-endian | |
921 | */ | |
922 | ||
923 | struct ieee80211_radiotap_iterator iterator; | |
924 | struct ieee80211_radiotap_header *rthdr = | |
925 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 926 | struct ieee80211_supported_band *sband; |
3b8d81e0 | 927 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
928 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
929 | ||
2e92e6f2 | 930 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 931 | |
3b8d81e0 | 932 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
5cf121c3 | 933 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
934 | |
935 | /* | |
936 | * for every radiotap entry that is present | |
937 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
938 | * entries present, or -EINVAL on error) | |
939 | */ | |
940 | ||
941 | while (!ret) { | |
e2ebc74d JB |
942 | ret = ieee80211_radiotap_iterator_next(&iterator); |
943 | ||
944 | if (ret) | |
945 | continue; | |
946 | ||
947 | /* see if this argument is something we can use */ | |
948 | switch (iterator.this_arg_index) { | |
949 | /* | |
950 | * You must take care when dereferencing iterator.this_arg | |
951 | * for multibyte types... the pointer is not aligned. Use | |
952 | * get_unaligned((type *)iterator.this_arg) to dereference | |
953 | * iterator.this_arg for type "type" safely on all arches. | |
954 | */ | |
e2ebc74d JB |
955 | case IEEE80211_RADIOTAP_FLAGS: |
956 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
957 | /* | |
958 | * this indicates that the skb we have been | |
959 | * handed has the 32-bit FCS CRC at the end... | |
960 | * we should react to that by snipping it off | |
961 | * because it will be recomputed and added | |
962 | * on transmission | |
963 | */ | |
964 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
27004b10 | 965 | return false; |
e2ebc74d JB |
966 | |
967 | skb_trim(skb, skb->len - FCS_LEN); | |
968 | } | |
58d4185e | 969 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
3b8d81e0 | 970 | info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; |
58d4185e | 971 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 972 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
973 | break; |
974 | ||
58d4185e JB |
975 | /* |
976 | * Please update the file | |
977 | * Documentation/networking/mac80211-injection.txt | |
978 | * when parsing new fields here. | |
979 | */ | |
980 | ||
e2ebc74d JB |
981 | default: |
982 | break; | |
983 | } | |
984 | } | |
985 | ||
986 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
27004b10 | 987 | return false; |
e2ebc74d JB |
988 | |
989 | /* | |
990 | * remove the radiotap header | |
991 | * iterator->max_length was sanity-checked against | |
992 | * skb->len by iterator init | |
993 | */ | |
994 | skb_pull(skb, iterator.max_length); | |
995 | ||
27004b10 | 996 | return true; |
e2ebc74d JB |
997 | } |
998 | ||
58d4185e JB |
999 | /* |
1000 | * initialises @tx | |
1001 | */ | |
9ae54c84 | 1002 | static ieee80211_tx_result |
3b8d81e0 JB |
1003 | ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, |
1004 | struct ieee80211_tx_data *tx, | |
1005 | struct sk_buff *skb) | |
e2ebc74d | 1006 | { |
3b8d81e0 | 1007 | struct ieee80211_local *local = sdata->local; |
58d4185e | 1008 | struct ieee80211_hdr *hdr; |
e039fa4a | 1009 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8b30b1fe S |
1010 | int hdrlen, tid; |
1011 | u8 *qc, *state; | |
cd8ffc80 | 1012 | bool queued = false; |
e2ebc74d JB |
1013 | |
1014 | memset(tx, 0, sizeof(*tx)); | |
1015 | tx->skb = skb; | |
3b8d81e0 | 1016 | tx->dev = sdata->dev; /* use original interface */ |
e2ebc74d | 1017 | tx->local = local; |
3b8d81e0 | 1018 | tx->sdata = sdata; |
e039fa4a | 1019 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 1020 | /* |
58d4185e JB |
1021 | * Set this flag (used below to indicate "automatic fragmentation"), |
1022 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 1023 | */ |
5cf121c3 | 1024 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1025 | |
1026 | /* process and remove the injection radiotap header */ | |
25d834e1 | 1027 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
27004b10 | 1028 | if (!__ieee80211_parse_tx_radiotap(tx, skb)) |
9ae54c84 | 1029 | return TX_DROP; |
58d4185e | 1030 | |
e2ebc74d | 1031 | /* |
58d4185e JB |
1032 | * __ieee80211_parse_tx_radiotap has now removed |
1033 | * the radiotap header that was present and pre-filled | |
1034 | * 'tx' with tx control information. | |
e2ebc74d | 1035 | */ |
e2ebc74d JB |
1036 | } |
1037 | ||
cd8ffc80 JB |
1038 | /* |
1039 | * If this flag is set to true anywhere, and we get here, | |
1040 | * we are doing the needed processing, so remove the flag | |
1041 | * now. | |
1042 | */ | |
1043 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1044 | ||
58d4185e JB |
1045 | hdr = (struct ieee80211_hdr *) skb->data; |
1046 | ||
24338793 | 1047 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 1048 | |
cd8ffc80 JB |
1049 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
1050 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { | |
96f5e66e | 1051 | unsigned long flags; |
cd8ffc80 JB |
1052 | struct tid_ampdu_tx *tid_tx; |
1053 | ||
8b30b1fe S |
1054 | qc = ieee80211_get_qos_ctl(hdr); |
1055 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1056 | ||
96f5e66e | 1057 | spin_lock_irqsave(&tx->sta->lock, flags); |
cd8ffc80 JB |
1058 | /* |
1059 | * XXX: This spinlock could be fairly expensive, but see the | |
1060 | * comment in agg-tx.c:ieee80211_agg_tx_operational(). | |
1061 | * One way to solve this would be to do something RCU-like | |
1062 | * for managing the tid_tx struct and using atomic bitops | |
1063 | * for the actual state -- by introducing an actual | |
1064 | * 'operational' bit that would be possible. It would | |
1065 | * require changing ieee80211_agg_tx_operational() to | |
1066 | * set that bit, and changing the way tid_tx is managed | |
1067 | * everywhere, including races between that bit and | |
1068 | * tid_tx going away (tid_tx being added can be easily | |
1069 | * committed to memory before the 'operational' bit). | |
1070 | */ | |
1071 | tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; | |
8b30b1fe | 1072 | state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; |
cd8ffc80 | 1073 | if (*state == HT_AGG_STATE_OPERATIONAL) { |
8b30b1fe | 1074 | info->flags |= IEEE80211_TX_CTL_AMPDU; |
cd8ffc80 JB |
1075 | } else if (*state != HT_AGG_STATE_IDLE) { |
1076 | /* in progress */ | |
1077 | queued = true; | |
5061b0c2 | 1078 | info->control.vif = &sdata->vif; |
cd8ffc80 JB |
1079 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
1080 | __skb_queue_tail(&tid_tx->pending, skb); | |
1081 | } | |
96f5e66e | 1082 | spin_unlock_irqrestore(&tx->sta->lock, flags); |
cd8ffc80 JB |
1083 | |
1084 | if (unlikely(queued)) | |
1085 | return TX_QUEUED; | |
8b30b1fe S |
1086 | } |
1087 | ||
badffb72 | 1088 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1089 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1090 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1091 | } else { |
5cf121c3 | 1092 | tx->flags |= IEEE80211_TX_UNICAST; |
d3707d99 JB |
1093 | if (unlikely(local->wifi_wme_noack_test)) |
1094 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1095 | else | |
1096 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; | |
badffb72 | 1097 | } |
58d4185e | 1098 | |
5cf121c3 JB |
1099 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1100 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
b9a5f8ca | 1101 | skb->len + FCS_LEN > local->hw.wiphy->frag_threshold && |
8d5e0d58 | 1102 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
5cf121c3 | 1103 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1104 | else |
5cf121c3 | 1105 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1106 | } |
1107 | ||
e2ebc74d | 1108 | if (!tx->sta) |
e039fa4a | 1109 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1110 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1111 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1112 | |
b73d70ad | 1113 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1114 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1115 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1116 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1117 | } | |
e039fa4a | 1118 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1119 | |
9ae54c84 | 1120 | return TX_CONTINUE; |
e2ebc74d JB |
1121 | } |
1122 | ||
2de8e0d9 | 1123 | static int __ieee80211_tx(struct ieee80211_local *local, |
1870cd71 | 1124 | struct sk_buff **skbp, |
3b8d81e0 JB |
1125 | struct sta_info *sta, |
1126 | bool txpending) | |
e2ebc74d | 1127 | { |
1870cd71 | 1128 | struct sk_buff *skb = *skbp, *next; |
f8e79ddd | 1129 | struct ieee80211_tx_info *info; |
5061b0c2 | 1130 | struct ieee80211_sub_if_data *sdata; |
3b8d81e0 | 1131 | unsigned long flags; |
a220858d | 1132 | int ret, len; |
2de8e0d9 | 1133 | bool fragm = false; |
e2ebc74d | 1134 | |
2de8e0d9 | 1135 | while (skb) { |
3b8d81e0 JB |
1136 | int q = skb_get_queue_mapping(skb); |
1137 | ||
1138 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
1139 | ret = IEEE80211_TX_OK; | |
1140 | if (local->queue_stop_reasons[q] || | |
1141 | (!txpending && !skb_queue_empty(&local->pending[q]))) | |
1142 | ret = IEEE80211_TX_PENDING; | |
1143 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
1144 | if (ret != IEEE80211_TX_OK) | |
1145 | return ret; | |
f8e79ddd | 1146 | |
f0e72851 JB |
1147 | info = IEEE80211_SKB_CB(skb); |
1148 | ||
1149 | if (fragm) | |
e6a9854b | 1150 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1151 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
f0e72851 | 1152 | |
2de8e0d9 | 1153 | next = skb->next; |
a220858d | 1154 | len = skb->len; |
5061b0c2 | 1155 | |
ad5351db JB |
1156 | if (next) |
1157 | info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; | |
1158 | ||
5061b0c2 JB |
1159 | sdata = vif_to_sdata(info->control.vif); |
1160 | ||
1161 | switch (sdata->vif.type) { | |
1162 | case NL80211_IFTYPE_MONITOR: | |
1163 | info->control.vif = NULL; | |
1164 | break; | |
1165 | case NL80211_IFTYPE_AP_VLAN: | |
1166 | info->control.vif = &container_of(sdata->bss, | |
1167 | struct ieee80211_sub_if_data, u.ap)->vif; | |
1168 | break; | |
1169 | default: | |
1170 | /* keep */ | |
1171 | break; | |
1172 | } | |
1173 | ||
24487981 | 1174 | ret = drv_tx(local, skb); |
a220858d JB |
1175 | if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { |
1176 | dev_kfree_skb(skb); | |
1177 | ret = NETDEV_TX_OK; | |
1178 | } | |
21f5fc75 LR |
1179 | if (ret != NETDEV_TX_OK) { |
1180 | info->control.vif = &sdata->vif; | |
2de8e0d9 | 1181 | return IEEE80211_TX_AGAIN; |
21f5fc75 LR |
1182 | } |
1183 | ||
1870cd71 | 1184 | *skbp = skb = next; |
2de8e0d9 JB |
1185 | ieee80211_led_tx(local, 1); |
1186 | fragm = true; | |
e2ebc74d | 1187 | } |
2de8e0d9 | 1188 | |
e2ebc74d JB |
1189 | return IEEE80211_TX_OK; |
1190 | } | |
1191 | ||
97b045d6 JB |
1192 | /* |
1193 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1194 | * frame was dropped or queued. | |
1195 | */ | |
1196 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1197 | { | |
97b045d6 | 1198 | struct sk_buff *skb = tx->skb; |
97b045d6 | 1199 | ieee80211_tx_result res = TX_DROP; |
97b045d6 | 1200 | |
d9e8a70f JB |
1201 | #define CALL_TXH(txh) \ |
1202 | res = txh(tx); \ | |
1203 | if (res != TX_CONTINUE) \ | |
1204 | goto txh_done; | |
1205 | ||
1206 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1207 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1208 | CALL_TXH(ieee80211_tx_h_select_key) | |
1209 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1210 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1211 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1212 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1213 | CALL_TXH(ieee80211_tx_h_fragment) |
1214 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
feff1f2f | 1215 | CALL_TXH(ieee80211_tx_h_stats) |
d9e8a70f JB |
1216 | CALL_TXH(ieee80211_tx_h_encrypt) |
1217 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
d9e8a70f | 1218 | #undef CALL_TXH |
97b045d6 | 1219 | |
d9e8a70f | 1220 | txh_done: |
97b045d6 | 1221 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1222 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
2de8e0d9 JB |
1223 | while (skb) { |
1224 | struct sk_buff *next; | |
1225 | ||
1226 | next = skb->next; | |
1227 | dev_kfree_skb(skb); | |
1228 | skb = next; | |
1229 | } | |
97b045d6 JB |
1230 | return -1; |
1231 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1232 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1233 | return -1; |
1234 | } | |
1235 | ||
1236 | return 0; | |
1237 | } | |
1238 | ||
3b8d81e0 JB |
1239 | static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, |
1240 | struct sk_buff *skb, bool txpending) | |
e2ebc74d | 1241 | { |
3b8d81e0 | 1242 | struct ieee80211_local *local = sdata->local; |
5cf121c3 | 1243 | struct ieee80211_tx_data tx; |
97b045d6 | 1244 | ieee80211_tx_result res_prepare; |
e039fa4a | 1245 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2a577d98 JB |
1246 | struct sk_buff *next; |
1247 | unsigned long flags; | |
1248 | int ret, retries; | |
e2530083 | 1249 | u16 queue; |
e2ebc74d | 1250 | |
e2530083 JB |
1251 | queue = skb_get_queue_mapping(skb); |
1252 | ||
e2ebc74d JB |
1253 | if (unlikely(skb->len < 10)) { |
1254 | dev_kfree_skb(skb); | |
cd8ffc80 | 1255 | return; |
e2ebc74d JB |
1256 | } |
1257 | ||
d0709a65 JB |
1258 | rcu_read_lock(); |
1259 | ||
58d4185e | 1260 | /* initialises tx */ |
3b8d81e0 | 1261 | res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); |
e2ebc74d | 1262 | |
cd8ffc80 | 1263 | if (unlikely(res_prepare == TX_DROP)) { |
e2ebc74d | 1264 | dev_kfree_skb(skb); |
d0709a65 | 1265 | rcu_read_unlock(); |
cd8ffc80 JB |
1266 | return; |
1267 | } else if (unlikely(res_prepare == TX_QUEUED)) { | |
1268 | rcu_read_unlock(); | |
1269 | return; | |
e2ebc74d JB |
1270 | } |
1271 | ||
5cf121c3 | 1272 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1273 | info->band = tx.channel->band; |
e2ebc74d | 1274 | |
97b045d6 JB |
1275 | if (invoke_tx_handlers(&tx)) |
1276 | goto out; | |
e2ebc74d | 1277 | |
2a577d98 JB |
1278 | retries = 0; |
1279 | retry: | |
3b8d81e0 | 1280 | ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); |
2a577d98 JB |
1281 | switch (ret) { |
1282 | case IEEE80211_TX_OK: | |
1283 | break; | |
1284 | case IEEE80211_TX_AGAIN: | |
eefce91a JB |
1285 | /* |
1286 | * Since there are no fragmented frames on A-MPDU | |
1287 | * queues, there's no reason for a driver to reject | |
1288 | * a frame there, warn and drop it. | |
1289 | */ | |
2a577d98 JB |
1290 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
1291 | goto drop; | |
1292 | /* fall through */ | |
1293 | case IEEE80211_TX_PENDING: | |
1294 | skb = tx.skb; | |
eefce91a | 1295 | |
2a577d98 | 1296 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
e2ebc74d | 1297 | |
3b8d81e0 JB |
1298 | if (local->queue_stop_reasons[queue] || |
1299 | !skb_queue_empty(&local->pending[queue])) { | |
1300 | /* | |
1301 | * if queue is stopped, queue up frames for later | |
1302 | * transmission from the tasklet | |
1303 | */ | |
2a577d98 JB |
1304 | do { |
1305 | next = skb->next; | |
1306 | skb->next = NULL; | |
cd8ffc80 | 1307 | if (unlikely(txpending)) |
3b8d81e0 JB |
1308 | __skb_queue_head(&local->pending[queue], |
1309 | skb); | |
cd8ffc80 | 1310 | else |
3b8d81e0 JB |
1311 | __skb_queue_tail(&local->pending[queue], |
1312 | skb); | |
2a577d98 JB |
1313 | } while ((skb = next)); |
1314 | ||
2a577d98 JB |
1315 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1316 | flags); | |
1317 | } else { | |
3b8d81e0 JB |
1318 | /* |
1319 | * otherwise retry, but this is a race condition or | |
1320 | * a driver bug (which we warn about if it persists) | |
1321 | */ | |
2a577d98 JB |
1322 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1323 | flags); | |
1324 | ||
1325 | retries++; | |
3b8d81e0 | 1326 | if (WARN(retries > 10, "tx refused but queue active\n")) |
2a577d98 | 1327 | goto drop; |
e2ebc74d JB |
1328 | goto retry; |
1329 | } | |
e2ebc74d | 1330 | } |
97b045d6 | 1331 | out: |
d4e46a3d | 1332 | rcu_read_unlock(); |
cd8ffc80 | 1333 | return; |
e2ebc74d JB |
1334 | |
1335 | drop: | |
d4e46a3d | 1336 | rcu_read_unlock(); |
2de8e0d9 JB |
1337 | |
1338 | skb = tx.skb; | |
1339 | while (skb) { | |
2de8e0d9 JB |
1340 | next = skb->next; |
1341 | dev_kfree_skb(skb); | |
1342 | skb = next; | |
1343 | } | |
e2ebc74d JB |
1344 | } |
1345 | ||
1346 | /* device xmit handlers */ | |
1347 | ||
23c0752a JB |
1348 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1349 | struct sk_buff *skb, | |
1350 | int head_need, bool may_encrypt) | |
1351 | { | |
1352 | int tail_need = 0; | |
1353 | ||
1354 | /* | |
1355 | * This could be optimised, devices that do full hardware | |
1356 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1357 | * have no drivers for such devices currently. | |
1358 | */ | |
1359 | if (may_encrypt) { | |
1360 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1361 | tail_need -= skb_tailroom(skb); | |
1362 | tail_need = max_t(int, tail_need, 0); | |
1363 | } | |
1364 | ||
1365 | if (head_need || tail_need) { | |
1366 | /* Sorry. Can't account for this any more */ | |
1367 | skb_orphan(skb); | |
1368 | } | |
1369 | ||
1370 | if (skb_header_cloned(skb)) | |
1371 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1372 | else | |
1373 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1374 | ||
1375 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1376 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1377 | wiphy_name(local->hw.wiphy)); | |
1378 | return -ENOMEM; | |
1379 | } | |
1380 | ||
1381 | /* update truesize too */ | |
1382 | skb->truesize += head_need + tail_need; | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
3b8d81e0 JB |
1387 | static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, |
1388 | struct sk_buff *skb) | |
e2ebc74d | 1389 | { |
3b8d81e0 | 1390 | struct ieee80211_local *local = sdata->local; |
e039fa4a | 1391 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1392 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
3b8d81e0 | 1393 | struct ieee80211_sub_if_data *tmp_sdata; |
e2ebc74d | 1394 | int headroom; |
23c0752a | 1395 | bool may_encrypt; |
e2ebc74d | 1396 | |
3b8d81e0 | 1397 | dev_hold(sdata->dev); |
e039fa4a | 1398 | |
4be8c387 | 1399 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
43f78531 | 1400 | local->hw.conf.dynamic_ps_timeout > 0 && |
fbe9c429 | 1401 | !(local->scanning) && local->ps_sdata) { |
d063ed0f VN |
1402 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
1403 | ieee80211_stop_queues_by_reason(&local->hw, | |
1404 | IEEE80211_QUEUE_STOP_REASON_PS); | |
42935eca | 1405 | ieee80211_queue_work(&local->hw, |
d063ed0f VN |
1406 | &local->dynamic_ps_disable_work); |
1407 | } | |
1408 | ||
1409 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
46f2c4bd | 1410 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
d063ed0f VN |
1411 | } |
1412 | ||
d0f09804 JB |
1413 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
1414 | ||
3b8d81e0 | 1415 | if (ieee80211_vif_is_mesh(&sdata->vif) && |
e32f85f7 | 1416 | ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 | 1417 | if (!is_multicast_ether_addr(hdr->addr1)) |
3b8d81e0 JB |
1418 | if (mesh_nexthop_lookup(skb, sdata)) { |
1419 | dev_put(sdata->dev); | |
1420 | return; | |
5dc306f3 | 1421 | } |
3b8d81e0 | 1422 | } else if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
25d834e1 JB |
1423 | int hdrlen; |
1424 | u16 len_rthdr; | |
1425 | ||
1426 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
25d834e1 JB |
1427 | |
1428 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
8ef86c7b | 1429 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); |
25d834e1 JB |
1430 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
1431 | ||
1432 | /* check the header is complete in the frame */ | |
1433 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1434 | /* | |
1435 | * We process outgoing injected frames that have a | |
1436 | * local address we handle as though they are our | |
1437 | * own frames. | |
1438 | * This code here isn't entirely correct, the local | |
1439 | * MAC address is not necessarily enough to find | |
1440 | * the interface to use; for that proper VLAN/WDS | |
1441 | * support we will need a different mechanism. | |
1442 | */ | |
1443 | ||
1444 | rcu_read_lock(); | |
3b8d81e0 | 1445 | list_for_each_entry_rcu(tmp_sdata, &local->interfaces, |
25d834e1 | 1446 | list) { |
3b8d81e0 | 1447 | if (!netif_running(tmp_sdata->dev)) |
25d834e1 | 1448 | continue; |
3b8d81e0 | 1449 | if (tmp_sdata->vif.type != NL80211_IFTYPE_AP) |
f1b33cb1 | 1450 | continue; |
3b8d81e0 | 1451 | if (compare_ether_addr(tmp_sdata->dev->dev_addr, |
25d834e1 | 1452 | hdr->addr2)) { |
3b8d81e0 JB |
1453 | dev_hold(tmp_sdata->dev); |
1454 | dev_put(sdata->dev); | |
1455 | sdata = tmp_sdata; | |
25d834e1 JB |
1456 | break; |
1457 | } | |
1458 | } | |
1459 | rcu_read_unlock(); | |
1460 | } | |
e32f85f7 LCC |
1461 | } |
1462 | ||
3b8d81e0 | 1463 | may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); |
23c0752a | 1464 | |
3b8d81e0 | 1465 | headroom = local->tx_headroom; |
23c0752a JB |
1466 | if (may_encrypt) |
1467 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1468 | headroom -= skb_headroom(skb); | |
1469 | headroom = max_t(int, 0, headroom); | |
1470 | ||
3b8d81e0 | 1471 | if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) { |
23c0752a | 1472 | dev_kfree_skb(skb); |
3b8d81e0 JB |
1473 | dev_put(sdata->dev); |
1474 | return; | |
e2ebc74d JB |
1475 | } |
1476 | ||
5061b0c2 | 1477 | info->control.vif = &sdata->vif; |
e2ebc74d | 1478 | |
3b8d81e0 JB |
1479 | ieee80211_select_queue(local, skb); |
1480 | ieee80211_tx(sdata, skb, false); | |
1481 | dev_put(sdata->dev); | |
e2ebc74d JB |
1482 | } |
1483 | ||
1484 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1485 | struct net_device *dev) | |
1486 | { | |
1487 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
47f4d887 | 1488 | struct ieee80211_channel *chan = local->hw.conf.channel; |
e2ebc74d JB |
1489 | struct ieee80211_radiotap_header *prthdr = |
1490 | (struct ieee80211_radiotap_header *)skb->data; | |
3b8d81e0 | 1491 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
9b8a74e3 | 1492 | u16 len_rthdr; |
e2ebc74d | 1493 | |
47f4d887 LR |
1494 | /* |
1495 | * Frame injection is not allowed if beaconing is not allowed | |
1496 | * or if we need radar detection. Beaconing is usually not allowed when | |
1497 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1498 | * Passive scan is also used in world regulatory domains where | |
1499 | * your country is not known and as such it should be treated as | |
1500 | * NO TX unless the channel is explicitly allowed in which case | |
1501 | * your current regulatory domain would not have the passive scan | |
1502 | * flag. | |
1503 | * | |
1504 | * Since AP mode uses monitor interfaces to inject/TX management | |
1505 | * frames we can make AP mode the exception to this rule once it | |
1506 | * supports radar detection as its implementation can deal with | |
1507 | * radar detection by itself. We can do that later by adding a | |
1508 | * monitor flag interfaces used for AP support. | |
1509 | */ | |
1510 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | | |
1511 | IEEE80211_CHAN_PASSIVE_SCAN))) | |
1512 | goto fail; | |
1513 | ||
9b8a74e3 AG |
1514 | /* check for not even having the fixed radiotap header part */ |
1515 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1516 | goto fail; /* too short to be possibly valid */ | |
1517 | ||
1518 | /* is it a header version we can trust to find length from? */ | |
1519 | if (unlikely(prthdr->it_version)) | |
1520 | goto fail; /* only version 0 is supported */ | |
1521 | ||
1522 | /* then there must be a radiotap header with a length we can use */ | |
1523 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1524 | ||
1525 | /* does the skb contain enough to deliver on the alleged length? */ | |
1526 | if (unlikely(skb->len < len_rthdr)) | |
1527 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d | 1528 | |
e2ebc74d JB |
1529 | /* |
1530 | * fix up the pointers accounting for the radiotap | |
1531 | * header still being in there. We are being given | |
1532 | * a precooked IEEE80211 header so no need for | |
1533 | * normal processing | |
1534 | */ | |
9b8a74e3 | 1535 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1536 | /* |
9b8a74e3 AG |
1537 | * these are just fixed to the end of the rt area since we |
1538 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1539 | */ |
9b8a74e3 AG |
1540 | skb_set_network_header(skb, len_rthdr); |
1541 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1542 | |
3b8d81e0 JB |
1543 | memset(info, 0, sizeof(*info)); |
1544 | ||
1545 | /* pass the radiotap header up to xmit */ | |
1546 | ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb); | |
e2ebc74d | 1547 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1548 | |
1549 | fail: | |
1550 | dev_kfree_skb(skb); | |
1551 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1552 | } |
1553 | ||
1554 | /** | |
1555 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1556 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1557 | * @skb: packet to be sent | |
1558 | * @dev: incoming interface | |
1559 | * | |
1560 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1561 | * not be freed, and caller is responsible for either retrying later or freeing | |
1562 | * skb). | |
1563 | * | |
1564 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1565 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1566 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1567 | * transmission (through low-level driver). | |
1568 | */ | |
1569 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1570 | struct net_device *dev) | |
1571 | { | |
133b8226 JB |
1572 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1573 | struct ieee80211_local *local = sdata->local; | |
3b8d81e0 | 1574 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
5b548140 | 1575 | int ret = NETDEV_TX_BUSY, head_need; |
065e9605 HH |
1576 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1577 | __le16 fc; | |
e2ebc74d | 1578 | struct ieee80211_hdr hdr; |
33b64eb2 | 1579 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1580 | const u8 *encaps_data; |
1581 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1582 | int nh_pos, h_pos; |
e2ebc74d | 1583 | struct sta_info *sta; |
ce3edf6d | 1584 | u32 sta_flags = 0; |
e2ebc74d | 1585 | |
e2ebc74d | 1586 | if (unlikely(skb->len < ETH_HLEN)) { |
ec634fe3 | 1587 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1588 | goto fail; |
1589 | } | |
1590 | ||
1591 | nh_pos = skb_network_header(skb) - skb->data; | |
1592 | h_pos = skb_transport_header(skb) - skb->data; | |
1593 | ||
1594 | /* convert Ethernet header to proper 802.11 header (based on | |
1595 | * operation mode) */ | |
1596 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1597 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1598 | |
51fb61e7 | 1599 | switch (sdata->vif.type) { |
05c914fe JB |
1600 | case NL80211_IFTYPE_AP: |
1601 | case NL80211_IFTYPE_AP_VLAN: | |
065e9605 | 1602 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1603 | /* DA BSSID SA */ |
1604 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1605 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1606 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1607 | hdrlen = 24; | |
cf966838 | 1608 | break; |
05c914fe | 1609 | case NL80211_IFTYPE_WDS: |
065e9605 | 1610 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1611 | /* RA TA DA SA */ |
1612 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1613 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1614 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1615 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1616 | hdrlen = 30; | |
cf966838 | 1617 | break; |
33b64eb2 | 1618 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1619 | case NL80211_IFTYPE_MESH_POINT: |
472dbc45 | 1620 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1621 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1622 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
ec634fe3 | 1623 | ret = NETDEV_TX_OK; |
e32f85f7 | 1624 | goto fail; |
33b64eb2 | 1625 | } |
79617dee Y |
1626 | |
1627 | if (compare_ether_addr(dev->dev_addr, | |
1628 | skb->data + ETH_ALEN) == 0) { | |
3c5772a5 JC |
1629 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1630 | skb->data, skb->data + ETH_ALEN); | |
1631 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
1632 | sdata, NULL, NULL, NULL); | |
79617dee Y |
1633 | } else { |
1634 | /* packet from other interface */ | |
1635 | struct mesh_path *mppath; | |
3c5772a5 JC |
1636 | int is_mesh_mcast = 1; |
1637 | char *mesh_da; | |
79617dee | 1638 | |
3c5772a5 | 1639 | rcu_read_lock(); |
79617dee | 1640 | if (is_multicast_ether_addr(skb->data)) |
3c5772a5 JC |
1641 | /* DA TA mSA AE:SA */ |
1642 | mesh_da = skb->data; | |
79617dee | 1643 | else { |
79617dee | 1644 | mppath = mpp_path_lookup(skb->data, sdata); |
3c5772a5 JC |
1645 | if (mppath) { |
1646 | /* RA TA mDA mSA AE:DA SA */ | |
1647 | mesh_da = mppath->mpp; | |
1648 | is_mesh_mcast = 0; | |
1649 | } else | |
1650 | /* DA TA mSA AE:SA */ | |
1651 | mesh_da = dev->broadcast; | |
79617dee | 1652 | } |
3c5772a5 JC |
1653 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1654 | mesh_da, dev->dev_addr); | |
1655 | rcu_read_unlock(); | |
1656 | if (is_mesh_mcast) | |
1657 | meshhdrlen = | |
1658 | ieee80211_new_mesh_header(&mesh_hdr, | |
1659 | sdata, | |
1660 | skb->data + ETH_ALEN, | |
1661 | NULL, | |
1662 | NULL); | |
1663 | else | |
1664 | meshhdrlen = | |
1665 | ieee80211_new_mesh_header(&mesh_hdr, | |
1666 | sdata, | |
1667 | NULL, | |
1668 | skb->data, | |
1669 | skb->data + ETH_ALEN); | |
79617dee | 1670 | |
79617dee | 1671 | } |
33b64eb2 LCC |
1672 | break; |
1673 | #endif | |
05c914fe | 1674 | case NL80211_IFTYPE_STATION: |
065e9605 | 1675 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d | 1676 | /* BSSID SA DA */ |
46900298 | 1677 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
e2ebc74d JB |
1678 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1679 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1680 | hdrlen = 24; | |
cf966838 | 1681 | break; |
05c914fe | 1682 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1683 | /* DA SA BSSID */ |
1684 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1685 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
46900298 | 1686 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
e2ebc74d | 1687 | hdrlen = 24; |
cf966838 JB |
1688 | break; |
1689 | default: | |
ec634fe3 | 1690 | ret = NETDEV_TX_OK; |
e2ebc74d JB |
1691 | goto fail; |
1692 | } | |
1693 | ||
7d185b8b JB |
1694 | /* |
1695 | * There's no need to try to look up the destination | |
1696 | * if it is a multicast address (which can only happen | |
1697 | * in AP mode) | |
1698 | */ | |
1699 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1700 | rcu_read_lock(); |
7d185b8b | 1701 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1702 | if (sta) |
07346f81 | 1703 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1704 | rcu_read_unlock(); |
e2ebc74d JB |
1705 | } |
1706 | ||
3434fbd3 | 1707 | /* receiver and we are QoS enabled, use a QoS type frame */ |
176be728 | 1708 | if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { |
065e9605 | 1709 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1710 | hdrlen += 2; |
1711 | } | |
1712 | ||
1713 | /* | |
238814fd JB |
1714 | * Drop unicast frames to unauthorised stations unless they are |
1715 | * EAPOL frames from the local station. | |
ce3edf6d | 1716 | */ |
e32f85f7 LCC |
1717 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1718 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1719 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1720 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1721 | compare_ether_addr(dev->dev_addr, |
1722 | skb->data + ETH_ALEN) == 0))) { | |
1723 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1724 | if (net_ratelimit()) |
0c68ae26 | 1725 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1726 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1727 | hdr.addr1); |
ce3edf6d JB |
1728 | #endif |
1729 | ||
1730 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1731 | ||
ec634fe3 | 1732 | ret = NETDEV_TX_OK; |
ce3edf6d JB |
1733 | goto fail; |
1734 | } | |
1735 | ||
065e9605 | 1736 | hdr.frame_control = fc; |
e2ebc74d JB |
1737 | hdr.duration_id = 0; |
1738 | hdr.seq_ctrl = 0; | |
1739 | ||
1740 | skip_header_bytes = ETH_HLEN; | |
1741 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1742 | encaps_data = bridge_tunnel_header; | |
1743 | encaps_len = sizeof(bridge_tunnel_header); | |
1744 | skip_header_bytes -= 2; | |
1745 | } else if (ethertype >= 0x600) { | |
1746 | encaps_data = rfc1042_header; | |
1747 | encaps_len = sizeof(rfc1042_header); | |
1748 | skip_header_bytes -= 2; | |
1749 | } else { | |
1750 | encaps_data = NULL; | |
1751 | encaps_len = 0; | |
1752 | } | |
1753 | ||
1754 | skb_pull(skb, skip_header_bytes); | |
1755 | nh_pos -= skip_header_bytes; | |
1756 | h_pos -= skip_header_bytes; | |
1757 | ||
23c0752a | 1758 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1759 | |
23c0752a JB |
1760 | /* |
1761 | * So we need to modify the skb header and hence need a copy of | |
1762 | * that. The head_need variable above doesn't, so far, include | |
1763 | * the needed header space that we don't need right away. If we | |
1764 | * can, then we don't reallocate right now but only after the | |
1765 | * frame arrives at the master device (if it does...) | |
1766 | * | |
1767 | * If we cannot, however, then we will reallocate to include all | |
1768 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1769 | * make it big enough for everything we may ever need. | |
1770 | */ | |
e2ebc74d | 1771 | |
3a5be7d4 | 1772 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1773 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1774 | head_need += local->tx_headroom; | |
1775 | head_need = max_t(int, 0, head_need); | |
1776 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1777 | goto fail; |
e2ebc74d JB |
1778 | } |
1779 | ||
1780 | if (encaps_data) { | |
1781 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1782 | nh_pos += encaps_len; | |
1783 | h_pos += encaps_len; | |
1784 | } | |
c29b9b9b | 1785 | |
33b64eb2 LCC |
1786 | if (meshhdrlen > 0) { |
1787 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1788 | nh_pos += meshhdrlen; | |
1789 | h_pos += meshhdrlen; | |
1790 | } | |
1791 | ||
065e9605 | 1792 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1793 | __le16 *qos_control; |
1794 | ||
1795 | qos_control = (__le16*) skb_push(skb, 2); | |
1796 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1797 | /* | |
1798 | * Maybe we could actually set some fields here, for now just | |
1799 | * initialise to zero to indicate no special operation. | |
1800 | */ | |
1801 | *qos_control = 0; | |
1802 | } else | |
1803 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1804 | ||
e2ebc74d JB |
1805 | nh_pos += hdrlen; |
1806 | h_pos += hdrlen; | |
1807 | ||
68aae116 SH |
1808 | dev->stats.tx_packets++; |
1809 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1810 | |
1811 | /* Update skb pointers to various headers since this modified frame | |
1812 | * is going to go through Linux networking code that may potentially | |
1813 | * need things like pointer to IP header. */ | |
1814 | skb_set_mac_header(skb, 0); | |
1815 | skb_set_network_header(skb, nh_pos); | |
1816 | skb_set_transport_header(skb, h_pos); | |
1817 | ||
3b8d81e0 JB |
1818 | memset(info, 0, sizeof(*info)); |
1819 | ||
e2ebc74d | 1820 | dev->trans_start = jiffies; |
3b8d81e0 | 1821 | ieee80211_xmit(sdata, skb); |
e2ebc74d | 1822 | |
ec634fe3 | 1823 | return NETDEV_TX_OK; |
e2ebc74d JB |
1824 | |
1825 | fail: | |
ec634fe3 | 1826 | if (ret == NETDEV_TX_OK) |
e2ebc74d JB |
1827 | dev_kfree_skb(skb); |
1828 | ||
1829 | return ret; | |
1830 | } | |
1831 | ||
e2ebc74d | 1832 | |
e2530083 JB |
1833 | /* |
1834 | * ieee80211_clear_tx_pending may not be called in a context where | |
1835 | * it is possible that it packets could come in again. | |
1836 | */ | |
e2ebc74d JB |
1837 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1838 | { | |
2de8e0d9 | 1839 | int i; |
e2ebc74d | 1840 | |
2a577d98 JB |
1841 | for (i = 0; i < local->hw.queues; i++) |
1842 | skb_queue_purge(&local->pending[i]); | |
e2ebc74d JB |
1843 | } |
1844 | ||
cd8ffc80 JB |
1845 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
1846 | struct sk_buff *skb) | |
1847 | { | |
1848 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1849 | struct ieee80211_sub_if_data *sdata; | |
1850 | struct sta_info *sta; | |
1851 | struct ieee80211_hdr *hdr; | |
cd8ffc80 JB |
1852 | int ret; |
1853 | bool result = true; | |
1854 | ||
5061b0c2 | 1855 | sdata = vif_to_sdata(info->control.vif); |
cd8ffc80 JB |
1856 | |
1857 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { | |
5061b0c2 | 1858 | ieee80211_tx(sdata, skb, true); |
cd8ffc80 JB |
1859 | } else { |
1860 | hdr = (struct ieee80211_hdr *)skb->data; | |
1861 | sta = sta_info_get(local, hdr->addr1); | |
1862 | ||
3b8d81e0 | 1863 | ret = __ieee80211_tx(local, &skb, sta, true); |
cd8ffc80 JB |
1864 | if (ret != IEEE80211_TX_OK) |
1865 | result = false; | |
1866 | } | |
1867 | ||
cd8ffc80 JB |
1868 | return result; |
1869 | } | |
1870 | ||
e2530083 | 1871 | /* |
3b8d81e0 | 1872 | * Transmit all pending packets. Called from tasklet. |
e2530083 | 1873 | */ |
e2ebc74d JB |
1874 | void ieee80211_tx_pending(unsigned long data) |
1875 | { | |
1876 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
2a577d98 | 1877 | unsigned long flags; |
cd8ffc80 | 1878 | int i; |
3b8d81e0 | 1879 | bool txok; |
e2ebc74d | 1880 | |
f0e72851 | 1881 | rcu_read_lock(); |
e2530083 | 1882 | |
3b8d81e0 | 1883 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
2a577d98 JB |
1884 | for (i = 0; i < local->hw.queues; i++) { |
1885 | /* | |
1886 | * If queue is stopped by something other than due to pending | |
1887 | * frames, or we have no pending frames, proceed to next queue. | |
1888 | */ | |
3b8d81e0 | 1889 | if (local->queue_stop_reasons[i] || |
2a577d98 | 1890 | skb_queue_empty(&local->pending[i])) |
e2ebc74d | 1891 | continue; |
e2530083 | 1892 | |
2a577d98 | 1893 | while (!skb_queue_empty(&local->pending[i])) { |
3b8d81e0 | 1894 | struct sk_buff *skb = __skb_dequeue(&local->pending[i]); |
5061b0c2 JB |
1895 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1896 | struct ieee80211_sub_if_data *sdata; | |
1897 | ||
a7bc376c JB |
1898 | if (WARN_ON(!info->control.vif)) { |
1899 | kfree_skb(skb); | |
1900 | continue; | |
1901 | } | |
1902 | ||
5061b0c2 JB |
1903 | sdata = vif_to_sdata(info->control.vif); |
1904 | dev_hold(sdata->dev); | |
3b8d81e0 JB |
1905 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1906 | flags); | |
1907 | ||
1908 | txok = ieee80211_tx_pending_skb(local, skb); | |
5061b0c2 | 1909 | dev_put(sdata->dev); |
3b8d81e0 JB |
1910 | if (!txok) |
1911 | __skb_queue_head(&local->pending[i], skb); | |
1912 | spin_lock_irqsave(&local->queue_stop_reason_lock, | |
1913 | flags); | |
1914 | if (!txok) | |
2a577d98 | 1915 | break; |
e2ebc74d JB |
1916 | } |
1917 | } | |
3b8d81e0 | 1918 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
2a577d98 | 1919 | |
f0e72851 | 1920 | rcu_read_unlock(); |
e2ebc74d JB |
1921 | } |
1922 | ||
1923 | /* functions for drivers to get certain frames */ | |
1924 | ||
8e7be8da | 1925 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
1926 | struct sk_buff *skb, |
1927 | struct beacon_data *beacon) | |
e2ebc74d JB |
1928 | { |
1929 | u8 *pos, *tim; | |
1930 | int aid0 = 0; | |
1931 | int i, have_bits = 0, n1, n2; | |
1932 | ||
1933 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1934 | * mode. */ | |
e2ebc74d JB |
1935 | if (atomic_read(&bss->num_sta_ps) > 0) |
1936 | /* in the hope that this is faster than | |
1937 | * checking byte-for-byte */ | |
1938 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1939 | IEEE80211_MAX_AID+1); | |
1940 | ||
1941 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1942 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1943 | else |
1944 | bss->dtim_count--; | |
1945 | ||
1946 | tim = pos = (u8 *) skb_put(skb, 6); | |
1947 | *pos++ = WLAN_EID_TIM; | |
1948 | *pos++ = 4; | |
1949 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1950 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1951 | |
1952 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1953 | aid0 = 1; | |
1954 | ||
1955 | if (have_bits) { | |
1956 | /* Find largest even number N1 so that bits numbered 1 through | |
1957 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1958 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1959 | n1 = 0; | |
1960 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1961 | if (bss->tim[i]) { | |
1962 | n1 = i & 0xfe; | |
1963 | break; | |
1964 | } | |
1965 | } | |
1966 | n2 = n1; | |
1967 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1968 | if (bss->tim[i]) { | |
1969 | n2 = i; | |
1970 | break; | |
1971 | } | |
1972 | } | |
1973 | ||
1974 | /* Bitmap control */ | |
1975 | *pos++ = n1 | aid0; | |
1976 | /* Part Virt Bitmap */ | |
1977 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1978 | ||
1979 | tim[1] = n2 - n1 + 4; | |
1980 | skb_put(skb, n2 - n1); | |
1981 | } else { | |
1982 | *pos++ = aid0; /* Bitmap control */ | |
1983 | *pos++ = 0; /* Part Virt Bitmap */ | |
1984 | } | |
e2ebc74d JB |
1985 | } |
1986 | ||
32bfd35d | 1987 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1988 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1989 | { |
1990 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 1991 | struct sk_buff *skb = NULL; |
e039fa4a | 1992 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1993 | struct ieee80211_sub_if_data *sdata = NULL; |
1994 | struct ieee80211_if_ap *ap = NULL; | |
5dfdaf58 | 1995 | struct beacon_data *beacon; |
8318d78a | 1996 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 1997 | enum ieee80211_band band = local->hw.conf.channel->band; |
8318d78a | 1998 | |
2e92e6f2 | 1999 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
2000 | |
2001 | rcu_read_lock(); | |
e2ebc74d | 2002 | |
32bfd35d | 2003 | sdata = vif_to_sdata(vif); |
e2ebc74d | 2004 | |
05c914fe | 2005 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
2006 | ap = &sdata->u.ap; |
2007 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
2008 | if (ap && beacon) { |
2009 | /* | |
2010 | * headroom, head length, | |
2011 | * tail length and maximum TIM length | |
2012 | */ | |
2013 | skb = dev_alloc_skb(local->tx_headroom + | |
2014 | beacon->head_len + | |
2015 | beacon->tail_len + 256); | |
2016 | if (!skb) | |
2017 | goto out; | |
33b64eb2 | 2018 | |
902acc78 JB |
2019 | skb_reserve(skb, local->tx_headroom); |
2020 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
2021 | beacon->head_len); | |
33b64eb2 | 2022 | |
d0709a65 JB |
2023 | /* |
2024 | * Not very nice, but we want to allow the driver to call | |
2025 | * ieee80211_beacon_get() as a response to the set_tim() | |
2026 | * callback. That, however, is already invoked under the | |
2027 | * sta_lock to guarantee consistent and race-free update | |
2028 | * of the tim bitmap in mac80211 and the driver. | |
2029 | */ | |
2030 | if (local->tim_in_locked_section) { | |
8e7be8da | 2031 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2032 | } else { |
2033 | unsigned long flags; | |
2034 | ||
2035 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 2036 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
2037 | spin_unlock_irqrestore(&local->sta_lock, flags); |
2038 | } | |
33b64eb2 | 2039 | |
902acc78 JB |
2040 | if (beacon->tail) |
2041 | memcpy(skb_put(skb, beacon->tail_len), | |
2042 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
2043 | } else |
2044 | goto out; | |
05c914fe | 2045 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
46900298 | 2046 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
9d139c81 | 2047 | struct ieee80211_hdr *hdr; |
af8cdcd8 | 2048 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
33b64eb2 | 2049 | |
af8cdcd8 | 2050 | if (!presp) |
9d139c81 JB |
2051 | goto out; |
2052 | ||
af8cdcd8 | 2053 | skb = skb_copy(presp, GFP_ATOMIC); |
9d139c81 JB |
2054 | if (!skb) |
2055 | goto out; | |
2056 | ||
2057 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
2058 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2059 | IEEE80211_STYPE_BEACON); | |
902acc78 | 2060 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
2061 | struct ieee80211_mgmt *mgmt; |
2062 | u8 *pos; | |
2063 | ||
902acc78 JB |
2064 | /* headroom, head length, tail length and maximum TIM length */ |
2065 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
2066 | if (!skb) | |
2067 | goto out; | |
2068 | ||
2069 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2070 | mgmt = (struct ieee80211_mgmt *) | |
2071 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
2072 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
2073 | mgmt->frame_control = |
2074 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
2075 | memset(mgmt->da, 0xff, ETH_ALEN); |
2076 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
2077 | /* BSSID is left zeroed, wildcard value */ | |
2078 | mgmt->u.beacon.beacon_int = | |
57c4d7b4 | 2079 | cpu_to_le16(sdata->vif.bss_conf.beacon_int); |
902acc78 JB |
2080 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ |
2081 | ||
2082 | pos = skb_put(skb, 2); | |
2083 | *pos++ = WLAN_EID_SSID; | |
2084 | *pos++ = 0x0; | |
2085 | ||
f698d856 | 2086 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
2087 | } else { |
2088 | WARN_ON(1); | |
5dfdaf58 | 2089 | goto out; |
e2ebc74d JB |
2090 | } |
2091 | ||
e039fa4a JB |
2092 | info = IEEE80211_SKB_CB(skb); |
2093 | ||
3b8d81e0 | 2094 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
e039fa4a | 2095 | info->band = band; |
e6a9854b JB |
2096 | /* |
2097 | * XXX: For now, always use the lowest rate | |
2098 | */ | |
2099 | info->control.rates[0].idx = 0; | |
2100 | info->control.rates[0].count = 1; | |
2101 | info->control.rates[1].idx = -1; | |
2102 | info->control.rates[2].idx = -1; | |
2103 | info->control.rates[3].idx = -1; | |
2104 | info->control.rates[4].idx = -1; | |
2105 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
e039fa4a JB |
2106 | |
2107 | info->control.vif = vif; | |
f591fa5d JB |
2108 | |
2109 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
2110 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
2111 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e6a9854b | 2112 | out: |
5dfdaf58 | 2113 | rcu_read_unlock(); |
e2ebc74d JB |
2114 | return skb; |
2115 | } | |
2116 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
2117 | ||
32bfd35d | 2118 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2119 | const void *frame, size_t frame_len, |
e039fa4a | 2120 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2121 | struct ieee80211_rts *rts) |
2122 | { | |
2123 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2124 | |
065e9605 HH |
2125 | rts->frame_control = |
2126 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
2127 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2128 | frame_txctl); | |
e2ebc74d JB |
2129 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2130 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2131 | } | |
2132 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2133 | ||
32bfd35d | 2134 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2135 | const void *frame, size_t frame_len, |
e039fa4a | 2136 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2137 | struct ieee80211_cts *cts) |
2138 | { | |
2139 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2140 | |
065e9605 HH |
2141 | cts->frame_control = |
2142 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2143 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2144 | frame_len, frame_txctl); | |
e2ebc74d JB |
2145 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2146 | } | |
2147 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2148 | ||
2149 | struct sk_buff * | |
32bfd35d | 2150 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2151 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2152 | { |
2153 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2154 | struct sk_buff *skb = NULL; |
e2ebc74d | 2155 | struct sta_info *sta; |
5cf121c3 | 2156 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2157 | struct ieee80211_sub_if_data *sdata; |
2158 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2159 | struct beacon_data *beacon; |
e039fa4a | 2160 | struct ieee80211_tx_info *info; |
e2ebc74d | 2161 | |
32bfd35d | 2162 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2163 | bss = &sdata->u.ap; |
5dfdaf58 | 2164 | |
5dfdaf58 JB |
2165 | rcu_read_lock(); |
2166 | beacon = rcu_dereference(bss->beacon); | |
2167 | ||
05c914fe | 2168 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2169 | goto out; |
5dfdaf58 | 2170 | |
e2ebc74d | 2171 | if (bss->dtim_count != 0) |
747cf5e9 | 2172 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2173 | |
e2ebc74d JB |
2174 | while (1) { |
2175 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2176 | if (!skb) | |
747cf5e9 | 2177 | goto out; |
e2ebc74d JB |
2178 | local->total_ps_buffered--; |
2179 | ||
2180 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2181 | struct ieee80211_hdr *hdr = | |
2182 | (struct ieee80211_hdr *) skb->data; | |
2183 | /* more buffered multicast/broadcast frames ==> set | |
2184 | * MoreData flag in IEEE 802.11 header to inform PS | |
2185 | * STAs */ | |
2186 | hdr->frame_control |= | |
2187 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2188 | } | |
2189 | ||
3b8d81e0 | 2190 | if (!ieee80211_tx_prepare(sdata, &tx, skb)) |
e2ebc74d JB |
2191 | break; |
2192 | dev_kfree_skb_any(skb); | |
2193 | } | |
e039fa4a JB |
2194 | |
2195 | info = IEEE80211_SKB_CB(skb); | |
2196 | ||
e2ebc74d | 2197 | sta = tx.sta; |
5cf121c3 JB |
2198 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2199 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2200 | info->band = tx.channel->band; |
e2ebc74d | 2201 | |
97b045d6 | 2202 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2203 | skb = NULL; |
97b045d6 | 2204 | out: |
d0709a65 | 2205 | rcu_read_unlock(); |
e2ebc74d JB |
2206 | |
2207 | return skb; | |
2208 | } | |
2209 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); | |
3b8d81e0 JB |
2210 | |
2211 | void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, | |
2212 | int encrypt) | |
2213 | { | |
2214 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2215 | skb_set_mac_header(skb, 0); | |
2216 | skb_set_network_header(skb, 0); | |
2217 | skb_set_transport_header(skb, 0); | |
2218 | ||
3b8d81e0 JB |
2219 | if (!encrypt) |
2220 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; | |
2221 | ||
3d34deb6 JB |
2222 | /* |
2223 | * The other path calling ieee80211_xmit is from the tasklet, | |
2224 | * and while we can handle concurrent transmissions locking | |
2225 | * requirements are that we do not come into tx with bhs on. | |
2226 | */ | |
2227 | local_bh_disable(); | |
3b8d81e0 | 2228 | ieee80211_xmit(sdata, skb); |
3d34deb6 | 2229 | local_bh_enable(); |
3b8d81e0 | 2230 | } |