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" | |
2c8dccc7 | 28 | #include "led.h" |
33b64eb2 | 29 | #include "mesh.h" |
e2ebc74d JB |
30 | #include "wep.h" |
31 | #include "wpa.h" | |
32 | #include "wme.h" | |
2c8dccc7 | 33 | #include "rate.h" |
e2ebc74d JB |
34 | |
35 | #define IEEE80211_TX_OK 0 | |
36 | #define IEEE80211_TX_AGAIN 1 | |
37 | #define IEEE80211_TX_FRAG_AGAIN 2 | |
38 | ||
39 | /* misc utils */ | |
40 | ||
03f93c3d JB |
41 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
42 | int next_frag_len) | |
e2ebc74d JB |
43 | { |
44 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 45 | struct ieee80211_rate *txrate; |
e2ebc74d | 46 | struct ieee80211_local *local = tx->local; |
8318d78a | 47 | struct ieee80211_supported_band *sband; |
358c8d9d | 48 | struct ieee80211_hdr *hdr; |
e6a9854b JB |
49 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
50 | ||
51 | /* assume HW handles this */ | |
52 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) | |
53 | return 0; | |
54 | ||
55 | /* uh huh? */ | |
56 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) | |
57 | return 0; | |
e2ebc74d | 58 | |
2e92e6f2 | 59 | sband = local->hw.wiphy->bands[tx->channel->band]; |
e6a9854b | 60 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
8318d78a | 61 | |
e6a9854b | 62 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
e2ebc74d JB |
63 | |
64 | /* | |
65 | * data and mgmt (except PS Poll): | |
66 | * - during CFP: 32768 | |
67 | * - during contention period: | |
68 | * if addr1 is group address: 0 | |
69 | * if more fragments = 0 and addr1 is individual address: time to | |
70 | * transmit one ACK plus SIFS | |
71 | * if more fragments = 1 and addr1 is individual address: time to | |
72 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
73 | * | |
74 | * IEEE 802.11, 9.6: | |
75 | * - control response frame (CTS or ACK) shall be transmitted using the | |
76 | * same rate as the immediately previous frame in the frame exchange | |
77 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
78 | * at the highest possible rate belonging to the PHY rates in the | |
79 | * BSSBasicRateSet | |
80 | */ | |
358c8d9d HH |
81 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
82 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d | 83 | /* TODO: These control frames are not currently sent by |
ccd7b362 | 84 | * mac80211, but should they be implemented, this function |
e2ebc74d JB |
85 | * needs to be updated to support duration field calculation. |
86 | * | |
87 | * RTS: time needed to transmit pending data/mgmt frame plus | |
88 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
89 | * CTS: duration of immediately previous RTS minus time | |
90 | * required to transmit CTS and its SIFS | |
91 | * ACK: 0 if immediately previous directed data/mgmt had | |
92 | * more=0, with more=1 duration in ACK frame is duration | |
93 | * from previous frame minus time needed to transmit ACK | |
94 | * and its SIFS | |
95 | * PS Poll: BIT(15) | BIT(14) | aid | |
96 | */ | |
97 | return 0; | |
98 | } | |
99 | ||
100 | /* data/mgmt */ | |
101 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 102 | return cpu_to_le16(32768); |
e2ebc74d JB |
103 | |
104 | if (group_addr) /* Group address as the destination - no ACK */ | |
105 | return 0; | |
106 | ||
107 | /* Individual destination address: | |
108 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
109 | * CTS and ACK frames shall be transmitted using the highest rate in | |
110 | * basic rate set that is less than or equal to the rate of the | |
111 | * immediately previous frame and that is using the same modulation | |
112 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
113 | * the highest mandatory rate of the PHY that is less than or equal to | |
114 | * the rate of the previous frame is used. | |
115 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
116 | */ | |
117 | rate = -1; | |
8318d78a JB |
118 | /* use lowest available if everything fails */ |
119 | mrate = sband->bitrates[0].bitrate; | |
120 | for (i = 0; i < sband->n_bitrates; i++) { | |
121 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 122 | |
8318d78a JB |
123 | if (r->bitrate > txrate->bitrate) |
124 | break; | |
e2ebc74d | 125 | |
bda3933a | 126 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
8318d78a JB |
127 | rate = r->bitrate; |
128 | ||
129 | switch (sband->band) { | |
130 | case IEEE80211_BAND_2GHZ: { | |
131 | u32 flag; | |
132 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
133 | flag = IEEE80211_RATE_MANDATORY_G; | |
134 | else | |
135 | flag = IEEE80211_RATE_MANDATORY_B; | |
136 | if (r->flags & flag) | |
137 | mrate = r->bitrate; | |
138 | break; | |
139 | } | |
140 | case IEEE80211_BAND_5GHZ: | |
141 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
142 | mrate = r->bitrate; | |
143 | break; | |
144 | case IEEE80211_NUM_BANDS: | |
145 | WARN_ON(1); | |
146 | break; | |
147 | } | |
e2ebc74d JB |
148 | } |
149 | if (rate == -1) { | |
150 | /* No matching basic rate found; use highest suitable mandatory | |
151 | * PHY rate */ | |
152 | rate = mrate; | |
153 | } | |
154 | ||
155 | /* Time needed to transmit ACK | |
156 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
157 | * to closest integer */ | |
158 | ||
159 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
bda3933a | 160 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
161 | |
162 | if (next_frag_len) { | |
163 | /* Frame is fragmented: duration increases with time needed to | |
164 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
165 | dur *= 2; /* ACK + SIFS */ | |
166 | /* next fragment */ | |
167 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 168 | txrate->bitrate, erp, |
bda3933a | 169 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
170 | } |
171 | ||
03f93c3d | 172 | return cpu_to_le16(dur); |
e2ebc74d JB |
173 | } |
174 | ||
133b8226 JB |
175 | static int inline is_ieee80211_device(struct ieee80211_local *local, |
176 | struct net_device *dev) | |
e2ebc74d | 177 | { |
133b8226 | 178 | return local == wdev_priv(dev->ieee80211_ptr); |
e2ebc74d JB |
179 | } |
180 | ||
181 | /* tx handlers */ | |
182 | ||
d9e8a70f | 183 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 184 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 185 | { |
358c8d9d | 186 | |
e039fa4a | 187 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 188 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
189 | u32 sta_flags; |
190 | ||
e039fa4a | 191 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 192 | return TX_CONTINUE; |
58d4185e | 193 | |
c2b13452 | 194 | if (unlikely(tx->local->sw_scanning) && |
358c8d9d | 195 | !ieee80211_is_probe_req(hdr->frame_control)) |
9ae54c84 | 196 | return TX_DROP; |
e2ebc74d | 197 | |
05c914fe | 198 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
199 | return TX_CONTINUE; |
200 | ||
5cf121c3 | 201 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 202 | return TX_CONTINUE; |
e2ebc74d | 203 | |
07346f81 | 204 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 205 | |
5cf121c3 | 206 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 207 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 208 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 209 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
210 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
211 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 JB |
212 | "associated station %pM\n", |
213 | tx->dev->name, hdr->addr1); | |
e2ebc74d JB |
214 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
215 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 216 | return TX_DROP; |
e2ebc74d JB |
217 | } |
218 | } else { | |
358c8d9d | 219 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 220 | tx->local->num_sta == 0 && |
05c914fe | 221 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
222 | /* |
223 | * No associated STAs - no need to send multicast | |
224 | * frames. | |
225 | */ | |
9ae54c84 | 226 | return TX_DROP; |
e2ebc74d | 227 | } |
9ae54c84 | 228 | return TX_CONTINUE; |
e2ebc74d JB |
229 | } |
230 | ||
9ae54c84 | 231 | return TX_CONTINUE; |
e2ebc74d JB |
232 | } |
233 | ||
e2ebc74d JB |
234 | /* This function is called whenever the AP is about to exceed the maximum limit |
235 | * of buffered frames for power saving STAs. This situation should not really | |
236 | * happen often during normal operation, so dropping the oldest buffered packet | |
237 | * from each queue should be OK to make some room for new frames. */ | |
238 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
239 | { | |
240 | int total = 0, purged = 0; | |
241 | struct sk_buff *skb; | |
242 | struct ieee80211_sub_if_data *sdata; | |
243 | struct sta_info *sta; | |
244 | ||
79010420 JB |
245 | /* |
246 | * virtual interfaces are protected by RCU | |
247 | */ | |
248 | rcu_read_lock(); | |
249 | ||
250 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 251 | struct ieee80211_if_ap *ap; |
05c914fe | 252 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
253 | continue; |
254 | ap = &sdata->u.ap; | |
255 | skb = skb_dequeue(&ap->ps_bc_buf); | |
256 | if (skb) { | |
257 | purged++; | |
258 | dev_kfree_skb(skb); | |
259 | } | |
260 | total += skb_queue_len(&ap->ps_bc_buf); | |
261 | } | |
e2ebc74d | 262 | |
d0709a65 | 263 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
264 | skb = skb_dequeue(&sta->ps_tx_buf); |
265 | if (skb) { | |
266 | purged++; | |
267 | dev_kfree_skb(skb); | |
268 | } | |
269 | total += skb_queue_len(&sta->ps_tx_buf); | |
270 | } | |
d0709a65 JB |
271 | |
272 | rcu_read_unlock(); | |
e2ebc74d JB |
273 | |
274 | local->total_ps_buffered = total; | |
54223995 | 275 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 276 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 277 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 278 | #endif |
e2ebc74d JB |
279 | } |
280 | ||
9ae54c84 | 281 | static ieee80211_tx_result |
5cf121c3 | 282 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 283 | { |
e039fa4a | 284 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 285 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 286 | |
7d54d0dd JB |
287 | /* |
288 | * broadcast/multicast frame | |
289 | * | |
290 | * If any of the associated stations is in power save mode, | |
291 | * the frame is buffered to be sent after DTIM beacon frame. | |
292 | * This is done either by the hardware or us. | |
293 | */ | |
294 | ||
3e122be0 JB |
295 | /* powersaving STAs only in AP/VLAN mode */ |
296 | if (!tx->sdata->bss) | |
297 | return TX_CONTINUE; | |
298 | ||
299 | /* no buffering for ordered frames */ | |
358c8d9d | 300 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 301 | return TX_CONTINUE; |
7d54d0dd JB |
302 | |
303 | /* no stations in PS mode */ | |
304 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 305 | return TX_CONTINUE; |
7d54d0dd JB |
306 | |
307 | /* buffered in mac80211 */ | |
308 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
309 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
310 | purge_old_ps_buffers(tx->local); | |
311 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
312 | AP_MAX_BC_BUFFER) { | |
54223995 | 313 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d JB |
314 | if (net_ratelimit()) { |
315 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
316 | "dropping the oldest frame\n", | |
317 | tx->dev->name); | |
318 | } | |
f4ea83dd | 319 | #endif |
e2ebc74d JB |
320 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
321 | } else | |
322 | tx->local->total_ps_buffered++; | |
323 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 324 | return TX_QUEUED; |
e2ebc74d JB |
325 | } |
326 | ||
7d54d0dd | 327 | /* buffered in hardware */ |
e039fa4a | 328 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 329 | |
9ae54c84 | 330 | return TX_CONTINUE; |
e2ebc74d JB |
331 | } |
332 | ||
9ae54c84 | 333 | static ieee80211_tx_result |
5cf121c3 | 334 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
335 | { |
336 | struct sta_info *sta = tx->sta; | |
e039fa4a | 337 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 338 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
07346f81 | 339 | u32 staflags; |
e2ebc74d | 340 | |
358c8d9d | 341 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control))) |
9ae54c84 | 342 | return TX_CONTINUE; |
e2ebc74d | 343 | |
07346f81 JB |
344 | staflags = get_sta_flags(sta); |
345 | ||
346 | if (unlikely((staflags & WLAN_STA_PS) && | |
347 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 348 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 349 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
e2ebc74d | 350 | "before %d)\n", |
0c68ae26 | 351 | sta->sta.addr, sta->sta.aid, |
e2ebc74d JB |
352 | skb_queue_len(&sta->ps_tx_buf)); |
353 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
354 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
355 | purge_old_ps_buffers(tx->local); | |
356 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
357 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 358 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 359 | if (net_ratelimit()) { |
0c68ae26 | 360 | printk(KERN_DEBUG "%s: STA %pM TX " |
e2ebc74d | 361 | "buffer full - dropping oldest frame\n", |
0c68ae26 | 362 | tx->dev->name, sta->sta.addr); |
e2ebc74d | 363 | } |
f4ea83dd | 364 | #endif |
e2ebc74d JB |
365 | dev_kfree_skb(old); |
366 | } else | |
367 | tx->local->total_ps_buffered++; | |
004c872e | 368 | |
e2ebc74d | 369 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
370 | if (skb_queue_empty(&sta->ps_tx_buf)) |
371 | sta_info_set_tim_bit(sta); | |
372 | ||
e039fa4a | 373 | info->control.jiffies = jiffies; |
e2ebc74d | 374 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 375 | return TX_QUEUED; |
e2ebc74d JB |
376 | } |
377 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 378 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0c68ae26 | 379 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
e2ebc74d | 380 | "set -> send frame\n", tx->dev->name, |
0c68ae26 | 381 | sta->sta.addr); |
e2ebc74d JB |
382 | } |
383 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 384 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 385 | |
9ae54c84 | 386 | return TX_CONTINUE; |
e2ebc74d JB |
387 | } |
388 | ||
d9e8a70f | 389 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 390 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 391 | { |
5cf121c3 | 392 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 393 | return TX_CONTINUE; |
e2ebc74d | 394 | |
5cf121c3 | 395 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
396 | return ieee80211_tx_h_unicast_ps_buf(tx); |
397 | else | |
398 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
399 | } | |
400 | ||
d9e8a70f | 401 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 402 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 403 | { |
d4e46a3d | 404 | struct ieee80211_key *key; |
e039fa4a | 405 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 406 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 407 | |
d0f09804 | 408 | if (unlikely(tx->skb->do_not_encrypt)) |
e2ebc74d | 409 | tx->key = NULL; |
d4e46a3d JB |
410 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
411 | tx->key = key; | |
412 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
413 | tx->key = key; | |
e2ebc74d | 414 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 415 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e039fa4a | 416 | !(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
e2ebc74d | 417 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 418 | return TX_DROP; |
176e4f84 | 419 | } else |
e2ebc74d JB |
420 | tx->key = NULL; |
421 | ||
422 | if (tx->key) { | |
423 | tx->key->tx_rx_count++; | |
011bfcc4 | 424 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
425 | |
426 | switch (tx->key->conf.alg) { | |
427 | case ALG_WEP: | |
358c8d9d | 428 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
429 | break; |
430 | case ALG_TKIP: | |
431 | case ALG_CCMP: | |
358c8d9d | 432 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
433 | tx->key = NULL; |
434 | break; | |
435 | } | |
e2ebc74d JB |
436 | } |
437 | ||
176e4f84 | 438 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
d0f09804 | 439 | tx->skb->do_not_encrypt = 1; |
176e4f84 | 440 | |
9ae54c84 | 441 | return TX_CONTINUE; |
e2ebc74d JB |
442 | } |
443 | ||
d9e8a70f | 444 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 445 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 446 | { |
e039fa4a | 447 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
448 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
449 | struct ieee80211_supported_band *sband; | |
450 | struct ieee80211_rate *rate; | |
451 | int i, len; | |
452 | bool inval = false, rts = false, short_preamble = false; | |
453 | struct ieee80211_tx_rate_control txrc; | |
8318d78a | 454 | |
e6a9854b | 455 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 456 | |
e6a9854b | 457 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 458 | |
e6a9854b JB |
459 | len = min_t(int, tx->skb->len + FCS_LEN, |
460 | tx->local->fragmentation_threshold); | |
461 | ||
462 | /* set up the tx rate control struct we give the RC algo */ | |
463 | txrc.hw = local_to_hw(tx->local); | |
464 | txrc.sband = sband; | |
465 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
466 | txrc.skb = tx->skb; | |
467 | txrc.reported_rate.idx = -1; | |
468 | txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx; | |
469 | ||
470 | /* set up RTS protection if desired */ | |
471 | if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD && | |
472 | len > tx->local->rts_threshold) { | |
473 | txrc.rts = rts = true; | |
e2ebc74d | 474 | } |
e2ebc74d | 475 | |
e6a9854b JB |
476 | /* |
477 | * Use short preamble if the BSS can handle it, but not for | |
478 | * management frames unless we know the receiver can handle | |
479 | * that -- the management frame might be to a station that | |
480 | * just wants a probe response. | |
481 | */ | |
482 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
483 | (ieee80211_is_data(hdr->frame_control) || | |
484 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
485 | txrc.short_preamble = short_preamble = true; | |
e2ebc74d | 486 | |
2e92e6f2 | 487 | |
e6a9854b JB |
488 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
489 | ||
490 | if (unlikely(info->control.rates[0].idx < 0)) | |
491 | return TX_DROP; | |
492 | ||
493 | if (txrc.reported_rate.idx < 0) | |
494 | txrc.reported_rate = info->control.rates[0]; | |
e2ebc74d | 495 | |
e039fa4a | 496 | if (tx->sta) |
e6a9854b | 497 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 498 | |
e6a9854b JB |
499 | if (unlikely(!info->control.rates[0].count)) |
500 | info->control.rates[0].count = 1; | |
e2ebc74d | 501 | |
e6a9854b JB |
502 | if (is_multicast_ether_addr(hdr->addr1)) { |
503 | /* | |
504 | * XXX: verify the rate is in the basic rateset | |
505 | */ | |
506 | return TX_CONTINUE; | |
e2ebc74d JB |
507 | } |
508 | ||
e6a9854b JB |
509 | /* |
510 | * set up the RTS/CTS rate as the fastest basic rate | |
511 | * that is not faster than the data rate | |
512 | * | |
513 | * XXX: Should this check all retry rates? | |
514 | */ | |
515 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
516 | s8 baserate = 0; | |
517 | ||
518 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
519 | ||
520 | for (i = 0; i < sband->n_bitrates; i++) { | |
521 | /* must be a basic rate */ | |
522 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
523 | continue; | |
524 | /* must not be faster than the data rate */ | |
525 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
526 | continue; | |
527 | /* maximum */ | |
528 | if (sband->bitrates[baserate].bitrate < | |
529 | sband->bitrates[i].bitrate) | |
530 | baserate = i; | |
531 | } | |
532 | ||
533 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
534 | } |
535 | ||
e6a9854b JB |
536 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
537 | /* | |
538 | * make sure there's no valid rate following | |
539 | * an invalid one, just in case drivers don't | |
540 | * take the API seriously to stop at -1. | |
541 | */ | |
542 | if (inval) { | |
543 | info->control.rates[i].idx = -1; | |
544 | continue; | |
545 | } | |
546 | if (info->control.rates[i].idx < 0) { | |
547 | inval = true; | |
548 | continue; | |
549 | } | |
8318d78a | 550 | |
e6a9854b JB |
551 | /* |
552 | * For now assume MCS is already set up correctly, this | |
553 | * needs to be fixed. | |
554 | */ | |
555 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
556 | WARN_ON(info->control.rates[i].idx > 76); | |
557 | continue; | |
558 | } | |
e2ebc74d | 559 | |
e6a9854b JB |
560 | /* set up RTS protection if desired */ |
561 | if (rts) | |
562 | info->control.rates[i].flags |= | |
563 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 564 | |
e6a9854b | 565 | /* RC is busted */ |
075cbc9e S |
566 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
567 | sband->n_bitrates)) { | |
e6a9854b JB |
568 | info->control.rates[i].idx = -1; |
569 | continue; | |
8318d78a | 570 | } |
e2ebc74d | 571 | |
e6a9854b JB |
572 | rate = &sband->bitrates[info->control.rates[i].idx]; |
573 | ||
574 | /* set up short preamble */ | |
575 | if (short_preamble && | |
576 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
577 | info->control.rates[i].flags |= | |
578 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
579 | ||
580 | /* set up G protection */ | |
581 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
582 | rate->flags & IEEE80211_RATE_ERP_G) | |
583 | info->control.rates[i].flags |= | |
584 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
585 | } |
586 | ||
e6a9854b JB |
587 | return TX_CONTINUE; |
588 | } | |
589 | ||
590 | static ieee80211_tx_result debug_noinline | |
591 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) | |
592 | { | |
593 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
594 | ||
e2454948 | 595 | if (tx->sta) |
17741cdc | 596 | info->control.sta = &tx->sta->sta; |
e2454948 JB |
597 | |
598 | return TX_CONTINUE; | |
599 | } | |
600 | ||
f591fa5d JB |
601 | static ieee80211_tx_result debug_noinline |
602 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
603 | { | |
604 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
605 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
606 | u16 *seq; | |
607 | u8 *qc; | |
608 | int tid; | |
609 | ||
25d834e1 JB |
610 | /* |
611 | * Packet injection may want to control the sequence | |
612 | * number, if we have no matching interface then we | |
613 | * neither assign one ourselves nor ask the driver to. | |
614 | */ | |
615 | if (unlikely(!info->control.vif)) | |
616 | return TX_CONTINUE; | |
617 | ||
f591fa5d JB |
618 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
619 | return TX_CONTINUE; | |
620 | ||
621 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
622 | return TX_CONTINUE; | |
623 | ||
94778280 JB |
624 | /* |
625 | * Anything but QoS data that has a sequence number field | |
626 | * (is long enough) gets a sequence number from the global | |
627 | * counter. | |
628 | */ | |
f591fa5d | 629 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 630 | /* driver should assign sequence number */ |
f591fa5d | 631 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
632 | /* for pure STA mode without beacons, we can do it */ |
633 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
634 | tx->sdata->sequence_number += 0x10; | |
635 | tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ; | |
f591fa5d JB |
636 | return TX_CONTINUE; |
637 | } | |
638 | ||
639 | /* | |
640 | * This should be true for injected/management frames only, for | |
641 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
642 | * above since they are not QoS-data frames. | |
643 | */ | |
644 | if (!tx->sta) | |
645 | return TX_CONTINUE; | |
646 | ||
647 | /* include per-STA, per-TID sequence counter */ | |
648 | ||
649 | qc = ieee80211_get_qos_ctl(hdr); | |
650 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
651 | seq = &tx->sta->tid_seq[tid]; | |
652 | ||
653 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
654 | ||
655 | /* Increase the sequence number. */ | |
656 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
657 | ||
658 | return TX_CONTINUE; | |
659 | } | |
660 | ||
d9e8a70f | 661 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
662 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
663 | { | |
8b30b1fe | 664 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
065e9605 | 665 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2454948 JB |
666 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; |
667 | struct sk_buff **frags, *first, *frag; | |
668 | int i; | |
669 | u16 seq; | |
670 | u8 *pos; | |
671 | int frag_threshold = tx->local->fragmentation_threshold; | |
672 | ||
673 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
674 | return TX_CONTINUE; | |
675 | ||
eefce91a JB |
676 | /* |
677 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
678 | * This scenario is handled in __ieee80211_tx_prepare but extra |
679 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a | 680 | */ |
8b30b1fe | 681 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
682 | return TX_DROP; |
683 | ||
e2454948 JB |
684 | first = tx->skb; |
685 | ||
065e9605 | 686 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 JB |
687 | payload_len = first->len - hdrlen; |
688 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
689 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
690 | ||
691 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
692 | if (!frags) | |
693 | goto fail; | |
694 | ||
695 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
696 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
697 | pos = first->data + hdrlen + per_fragm; | |
698 | left = payload_len - per_fragm; | |
699 | for (i = 0; i < num_fragm - 1; i++) { | |
700 | struct ieee80211_hdr *fhdr; | |
701 | size_t copylen; | |
702 | ||
703 | if (left <= 0) | |
704 | goto fail; | |
705 | ||
706 | /* reserve enough extra head and tail room for possible | |
707 | * encryption */ | |
708 | frag = frags[i] = | |
709 | dev_alloc_skb(tx->local->tx_headroom + | |
710 | frag_threshold + | |
711 | IEEE80211_ENCRYPT_HEADROOM + | |
712 | IEEE80211_ENCRYPT_TAILROOM); | |
713 | if (!frag) | |
714 | goto fail; | |
e6a9854b | 715 | |
e2454948 JB |
716 | /* Make sure that all fragments use the same priority so |
717 | * that they end up using the same TX queue */ | |
718 | frag->priority = first->priority; | |
e6a9854b | 719 | |
e2454948 JB |
720 | skb_reserve(frag, tx->local->tx_headroom + |
721 | IEEE80211_ENCRYPT_HEADROOM); | |
e6a9854b JB |
722 | |
723 | /* copy TX information */ | |
724 | info = IEEE80211_SKB_CB(frag); | |
725 | memcpy(info, first->cb, sizeof(frag->cb)); | |
726 | ||
727 | /* copy/fill in 802.11 header */ | |
e2454948 JB |
728 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); |
729 | memcpy(fhdr, first->data, hdrlen); | |
e2454948 | 730 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); |
e6a9854b JB |
731 | |
732 | if (i == num_fragm - 2) { | |
733 | /* clear MOREFRAGS bit for the last fragment */ | |
734 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
735 | } else { | |
736 | /* | |
737 | * No multi-rate retries for fragmented frames, that | |
738 | * would completely throw off the NAV at other STAs. | |
739 | */ | |
740 | info->control.rates[1].idx = -1; | |
741 | info->control.rates[2].idx = -1; | |
742 | info->control.rates[3].idx = -1; | |
743 | info->control.rates[4].idx = -1; | |
744 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
745 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
746 | } | |
747 | ||
748 | /* copy data */ | |
e2454948 JB |
749 | copylen = left > per_fragm ? per_fragm : left; |
750 | memcpy(skb_put(frag, copylen), pos, copylen); | |
e6a9854b | 751 | |
03f93c3d | 752 | skb_copy_queue_mapping(frag, first); |
e6a9854b | 753 | |
d0f09804 | 754 | frag->do_not_encrypt = first->do_not_encrypt; |
e2454948 JB |
755 | |
756 | pos += copylen; | |
757 | left -= copylen; | |
e2ebc74d | 758 | } |
e2454948 JB |
759 | skb_trim(first, hdrlen + per_fragm); |
760 | ||
761 | tx->num_extra_frag = num_fragm - 1; | |
762 | tx->extra_frag = frags; | |
e2ebc74d | 763 | |
9ae54c84 | 764 | return TX_CONTINUE; |
e2454948 JB |
765 | |
766 | fail: | |
e2454948 JB |
767 | if (frags) { |
768 | for (i = 0; i < num_fragm - 1; i++) | |
769 | if (frags[i]) | |
770 | dev_kfree_skb(frags[i]); | |
771 | kfree(frags); | |
772 | } | |
773 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
774 | return TX_DROP; | |
e2ebc74d JB |
775 | } |
776 | ||
d9e8a70f | 777 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
778 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
779 | { | |
780 | if (!tx->key) | |
781 | return TX_CONTINUE; | |
782 | ||
783 | switch (tx->key->conf.alg) { | |
784 | case ALG_WEP: | |
785 | return ieee80211_crypto_wep_encrypt(tx); | |
786 | case ALG_TKIP: | |
787 | return ieee80211_crypto_tkip_encrypt(tx); | |
788 | case ALG_CCMP: | |
789 | return ieee80211_crypto_ccmp_encrypt(tx); | |
790 | } | |
791 | ||
792 | /* not reached */ | |
793 | WARN_ON(1); | |
794 | return TX_DROP; | |
795 | } | |
796 | ||
d9e8a70f | 797 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
798 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
799 | { | |
800 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
801 | int next_len, i; | |
802 | int group_addr = is_multicast_ether_addr(hdr->addr1); | |
803 | ||
804 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) { | |
805 | hdr->duration_id = ieee80211_duration(tx, group_addr, 0); | |
806 | return TX_CONTINUE; | |
807 | } | |
808 | ||
809 | hdr->duration_id = ieee80211_duration(tx, group_addr, | |
810 | tx->extra_frag[0]->len); | |
811 | ||
812 | for (i = 0; i < tx->num_extra_frag; i++) { | |
e6a9854b | 813 | if (i + 1 < tx->num_extra_frag) |
03f93c3d | 814 | next_len = tx->extra_frag[i + 1]->len; |
e6a9854b | 815 | else |
03f93c3d | 816 | next_len = 0; |
03f93c3d JB |
817 | |
818 | hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data; | |
819 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); | |
820 | } | |
821 | ||
822 | return TX_CONTINUE; | |
823 | } | |
824 | ||
d9e8a70f | 825 | static ieee80211_tx_result debug_noinline |
e2454948 | 826 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 827 | { |
9e72ebd6 | 828 | int i; |
e2ebc74d | 829 | |
9e72ebd6 JB |
830 | if (!tx->sta) |
831 | return TX_CONTINUE; | |
e2ebc74d | 832 | |
9e72ebd6 JB |
833 | tx->sta->tx_packets++; |
834 | tx->sta->tx_fragments++; | |
835 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 836 | if (tx->extra_frag) { |
9e72ebd6 JB |
837 | tx->sta->tx_fragments += tx->num_extra_frag; |
838 | for (i = 0; i < tx->num_extra_frag; i++) | |
839 | tx->sta->tx_bytes += tx->extra_frag[i]->len; | |
e2454948 JB |
840 | } |
841 | ||
9ae54c84 | 842 | return TX_CONTINUE; |
e2ebc74d JB |
843 | } |
844 | ||
e2ebc74d | 845 | |
e2ebc74d JB |
846 | /* actual transmit path */ |
847 | ||
848 | /* | |
849 | * deal with packet injection down monitor interface | |
850 | * with Radiotap Header -- only called for monitor mode interface | |
851 | */ | |
9ae54c84 | 852 | static ieee80211_tx_result |
5cf121c3 | 853 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 854 | struct sk_buff *skb) |
e2ebc74d JB |
855 | { |
856 | /* | |
857 | * this is the moment to interpret and discard the radiotap header that | |
858 | * must be at the start of the packet injected in Monitor mode | |
859 | * | |
860 | * Need to take some care with endian-ness since radiotap | |
861 | * args are little-endian | |
862 | */ | |
863 | ||
864 | struct ieee80211_radiotap_iterator iterator; | |
865 | struct ieee80211_radiotap_header *rthdr = | |
866 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 867 | struct ieee80211_supported_band *sband; |
e2ebc74d JB |
868 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
869 | ||
2e92e6f2 | 870 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 871 | |
d0f09804 | 872 | skb->do_not_encrypt = 1; |
5cf121c3 | 873 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
874 | |
875 | /* | |
876 | * for every radiotap entry that is present | |
877 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
878 | * entries present, or -EINVAL on error) | |
879 | */ | |
880 | ||
881 | while (!ret) { | |
e2ebc74d JB |
882 | ret = ieee80211_radiotap_iterator_next(&iterator); |
883 | ||
884 | if (ret) | |
885 | continue; | |
886 | ||
887 | /* see if this argument is something we can use */ | |
888 | switch (iterator.this_arg_index) { | |
889 | /* | |
890 | * You must take care when dereferencing iterator.this_arg | |
891 | * for multibyte types... the pointer is not aligned. Use | |
892 | * get_unaligned((type *)iterator.this_arg) to dereference | |
893 | * iterator.this_arg for type "type" safely on all arches. | |
894 | */ | |
e2ebc74d JB |
895 | case IEEE80211_RADIOTAP_FLAGS: |
896 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
897 | /* | |
898 | * this indicates that the skb we have been | |
899 | * handed has the 32-bit FCS CRC at the end... | |
900 | * we should react to that by snipping it off | |
901 | * because it will be recomputed and added | |
902 | * on transmission | |
903 | */ | |
904 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 905 | return TX_DROP; |
e2ebc74d JB |
906 | |
907 | skb_trim(skb, skb->len - FCS_LEN); | |
908 | } | |
58d4185e | 909 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 910 | tx->skb->do_not_encrypt = 0; |
58d4185e | 911 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 912 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
913 | break; |
914 | ||
58d4185e JB |
915 | /* |
916 | * Please update the file | |
917 | * Documentation/networking/mac80211-injection.txt | |
918 | * when parsing new fields here. | |
919 | */ | |
920 | ||
e2ebc74d JB |
921 | default: |
922 | break; | |
923 | } | |
924 | } | |
925 | ||
926 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 927 | return TX_DROP; |
e2ebc74d JB |
928 | |
929 | /* | |
930 | * remove the radiotap header | |
931 | * iterator->max_length was sanity-checked against | |
932 | * skb->len by iterator init | |
933 | */ | |
934 | skb_pull(skb, iterator.max_length); | |
935 | ||
9ae54c84 | 936 | return TX_CONTINUE; |
e2ebc74d JB |
937 | } |
938 | ||
58d4185e JB |
939 | /* |
940 | * initialises @tx | |
941 | */ | |
9ae54c84 | 942 | static ieee80211_tx_result |
5cf121c3 | 943 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 944 | struct sk_buff *skb, |
e039fa4a | 945 | struct net_device *dev) |
e2ebc74d JB |
946 | { |
947 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 948 | struct ieee80211_hdr *hdr; |
e2ebc74d | 949 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 950 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 951 | |
8b30b1fe S |
952 | int hdrlen, tid; |
953 | u8 *qc, *state; | |
e2ebc74d JB |
954 | |
955 | memset(tx, 0, sizeof(*tx)); | |
956 | tx->skb = skb; | |
957 | tx->dev = dev; /* use original interface */ | |
958 | tx->local = local; | |
959 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 960 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 961 | /* |
58d4185e JB |
962 | * Set this flag (used below to indicate "automatic fragmentation"), |
963 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 964 | */ |
5cf121c3 | 965 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
966 | |
967 | /* process and remove the injection radiotap header */ | |
968 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
25d834e1 | 969 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
9ae54c84 JB |
970 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
971 | return TX_DROP; | |
58d4185e | 972 | |
e2ebc74d | 973 | /* |
58d4185e JB |
974 | * __ieee80211_parse_tx_radiotap has now removed |
975 | * the radiotap header that was present and pre-filled | |
976 | * 'tx' with tx control information. | |
e2ebc74d | 977 | */ |
e2ebc74d JB |
978 | } |
979 | ||
58d4185e JB |
980 | hdr = (struct ieee80211_hdr *) skb->data; |
981 | ||
24338793 | 982 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 983 | |
8b30b1fe S |
984 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control)) { |
985 | qc = ieee80211_get_qos_ctl(hdr); | |
986 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
987 | ||
988 | state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; | |
989 | if (*state == HT_AGG_STATE_OPERATIONAL) | |
990 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
991 | } | |
992 | ||
badffb72 | 993 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 994 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 995 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 996 | } else { |
5cf121c3 | 997 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 998 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 999 | } |
58d4185e | 1000 | |
5cf121c3 JB |
1001 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1002 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 1003 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 | 1004 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
5cf121c3 | 1005 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1006 | else |
5cf121c3 | 1007 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1008 | } |
1009 | ||
e2ebc74d | 1010 | if (!tx->sta) |
e039fa4a | 1011 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1012 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1013 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1014 | |
b73d70ad | 1015 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1016 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1017 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1018 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1019 | } | |
e039fa4a | 1020 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1021 | |
9ae54c84 | 1022 | return TX_CONTINUE; |
e2ebc74d JB |
1023 | } |
1024 | ||
32bfd35d | 1025 | /* |
58d4185e JB |
1026 | * NB: @tx is uninitialised when passed in here |
1027 | */ | |
133b8226 JB |
1028 | static int ieee80211_tx_prepare(struct ieee80211_local *local, |
1029 | struct ieee80211_tx_data *tx, | |
1030 | struct sk_buff *skb) | |
e2ebc74d | 1031 | { |
e2ebc74d JB |
1032 | struct net_device *dev; |
1033 | ||
d0f09804 | 1034 | dev = dev_get_by_index(&init_net, skb->iif); |
133b8226 | 1035 | if (unlikely(dev && !is_ieee80211_device(local, dev))) { |
e2ebc74d JB |
1036 | dev_put(dev); |
1037 | dev = NULL; | |
1038 | } | |
1039 | if (unlikely(!dev)) | |
1040 | return -ENODEV; | |
58d4185e | 1041 | /* initialises tx with control */ |
e039fa4a | 1042 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1043 | dev_put(dev); |
e2ebc74d JB |
1044 | return 0; |
1045 | } | |
1046 | ||
1047 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1048 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1049 | { |
f8e79ddd | 1050 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1051 | int ret, i; |
1052 | ||
e2ebc74d | 1053 | if (skb) { |
f8e79ddd TW |
1054 | if (netif_subqueue_stopped(local->mdev, skb)) |
1055 | return IEEE80211_TX_AGAIN; | |
f8e79ddd | 1056 | |
e039fa4a | 1057 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1058 | if (ret) |
1059 | return IEEE80211_TX_AGAIN; | |
1060 | local->mdev->trans_start = jiffies; | |
1061 | ieee80211_led_tx(local, 1); | |
1062 | } | |
5cf121c3 | 1063 | if (tx->extra_frag) { |
5cf121c3 JB |
1064 | for (i = 0; i < tx->num_extra_frag; i++) { |
1065 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1066 | continue; |
e039fa4a | 1067 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
e6a9854b | 1068 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1069 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
e2530083 JB |
1070 | if (netif_subqueue_stopped(local->mdev, |
1071 | tx->extra_frag[i])) | |
e2ebc74d | 1072 | return IEEE80211_TX_FRAG_AGAIN; |
e2ebc74d | 1073 | |
e2ebc74d | 1074 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1075 | tx->extra_frag[i]); |
e2ebc74d JB |
1076 | if (ret) |
1077 | return IEEE80211_TX_FRAG_AGAIN; | |
1078 | local->mdev->trans_start = jiffies; | |
1079 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1080 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1081 | } |
5cf121c3 JB |
1082 | kfree(tx->extra_frag); |
1083 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1084 | } |
1085 | return IEEE80211_TX_OK; | |
1086 | } | |
1087 | ||
97b045d6 JB |
1088 | /* |
1089 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1090 | * frame was dropped or queued. | |
1091 | */ | |
1092 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1093 | { | |
97b045d6 | 1094 | struct sk_buff *skb = tx->skb; |
97b045d6 JB |
1095 | ieee80211_tx_result res = TX_DROP; |
1096 | int i; | |
1097 | ||
d9e8a70f JB |
1098 | #define CALL_TXH(txh) \ |
1099 | res = txh(tx); \ | |
1100 | if (res != TX_CONTINUE) \ | |
1101 | goto txh_done; | |
1102 | ||
1103 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1104 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1105 | CALL_TXH(ieee80211_tx_h_select_key) | |
1106 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1107 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1108 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1109 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1110 | CALL_TXH(ieee80211_tx_h_fragment) |
1111 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1112 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1113 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1114 | CALL_TXH(ieee80211_tx_h_stats) | |
1115 | #undef CALL_TXH | |
97b045d6 | 1116 | |
d9e8a70f | 1117 | txh_done: |
97b045d6 | 1118 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1119 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
97b045d6 JB |
1120 | dev_kfree_skb(skb); |
1121 | for (i = 0; i < tx->num_extra_frag; i++) | |
1122 | if (tx->extra_frag[i]) | |
1123 | dev_kfree_skb(tx->extra_frag[i]); | |
1124 | kfree(tx->extra_frag); | |
1125 | return -1; | |
1126 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1127 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1128 | return -1; |
1129 | } | |
1130 | ||
1131 | return 0; | |
1132 | } | |
1133 | ||
e039fa4a | 1134 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1135 | { |
1136 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1137 | struct sta_info *sta; | |
5cf121c3 | 1138 | struct ieee80211_tx_data tx; |
97b045d6 | 1139 | ieee80211_tx_result res_prepare; |
e039fa4a | 1140 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1141 | int ret, i; |
e2530083 | 1142 | u16 queue; |
e2ebc74d | 1143 | |
e2530083 JB |
1144 | queue = skb_get_queue_mapping(skb); |
1145 | ||
1146 | WARN_ON(test_bit(queue, local->queues_pending)); | |
e2ebc74d JB |
1147 | |
1148 | if (unlikely(skb->len < 10)) { | |
1149 | dev_kfree_skb(skb); | |
1150 | return 0; | |
1151 | } | |
1152 | ||
d0709a65 JB |
1153 | rcu_read_lock(); |
1154 | ||
58d4185e | 1155 | /* initialises tx */ |
e039fa4a | 1156 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1157 | |
9ae54c84 | 1158 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1159 | dev_kfree_skb(skb); |
d0709a65 | 1160 | rcu_read_unlock(); |
e2ebc74d JB |
1161 | return 0; |
1162 | } | |
1163 | ||
1164 | sta = tx.sta; | |
5cf121c3 | 1165 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1166 | info->band = tx.channel->band; |
e2ebc74d | 1167 | |
97b045d6 JB |
1168 | if (invoke_tx_handlers(&tx)) |
1169 | goto out; | |
e2ebc74d | 1170 | |
e2ebc74d JB |
1171 | retry: |
1172 | ret = __ieee80211_tx(local, skb, &tx); | |
1173 | if (ret) { | |
eefce91a JB |
1174 | struct ieee80211_tx_stored_packet *store; |
1175 | ||
1176 | /* | |
1177 | * Since there are no fragmented frames on A-MPDU | |
1178 | * queues, there's no reason for a driver to reject | |
1179 | * a frame there, warn and drop it. | |
1180 | */ | |
8b30b1fe | 1181 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
1182 | goto drop; |
1183 | ||
1184 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1185 | |
1186 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1187 | skb = NULL; | |
f8e79ddd | 1188 | |
e2530083 | 1189 | set_bit(queue, local->queues_pending); |
e2ebc74d | 1190 | smp_mb(); |
e2530083 JB |
1191 | /* |
1192 | * When the driver gets out of buffers during sending of | |
1193 | * fragments and calls ieee80211_stop_queue, the netif | |
1194 | * subqueue is stopped. There is, however, a small window | |
1195 | * in which the PENDING bit is not yet set. If a buffer | |
e2ebc74d JB |
1196 | * gets available in that window (i.e. driver calls |
1197 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
e2530083 | 1198 | * called with the PENDING bit still set. Prevent this by |
e2ebc74d | 1199 | * continuing transmitting here when that situation is |
e2530083 JB |
1200 | * possible to have happened. |
1201 | */ | |
1202 | if (!__netif_subqueue_stopped(local->mdev, queue)) { | |
1203 | clear_bit(queue, local->queues_pending); | |
e2ebc74d JB |
1204 | goto retry; |
1205 | } | |
e2ebc74d | 1206 | store->skb = skb; |
5cf121c3 JB |
1207 | store->extra_frag = tx.extra_frag; |
1208 | store->num_extra_frag = tx.num_extra_frag; | |
e2ebc74d | 1209 | } |
97b045d6 | 1210 | out: |
d4e46a3d | 1211 | rcu_read_unlock(); |
e2ebc74d JB |
1212 | return 0; |
1213 | ||
1214 | drop: | |
1215 | if (skb) | |
1216 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1217 | for (i = 0; i < tx.num_extra_frag; i++) |
1218 | if (tx.extra_frag[i]) | |
1219 | dev_kfree_skb(tx.extra_frag[i]); | |
1220 | kfree(tx.extra_frag); | |
d4e46a3d | 1221 | rcu_read_unlock(); |
e2ebc74d JB |
1222 | return 0; |
1223 | } | |
1224 | ||
1225 | /* device xmit handlers */ | |
1226 | ||
23c0752a JB |
1227 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1228 | struct sk_buff *skb, | |
1229 | int head_need, bool may_encrypt) | |
1230 | { | |
1231 | int tail_need = 0; | |
1232 | ||
1233 | /* | |
1234 | * This could be optimised, devices that do full hardware | |
1235 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1236 | * have no drivers for such devices currently. | |
1237 | */ | |
1238 | if (may_encrypt) { | |
1239 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1240 | tail_need -= skb_tailroom(skb); | |
1241 | tail_need = max_t(int, tail_need, 0); | |
1242 | } | |
1243 | ||
1244 | if (head_need || tail_need) { | |
1245 | /* Sorry. Can't account for this any more */ | |
1246 | skb_orphan(skb); | |
1247 | } | |
1248 | ||
1249 | if (skb_header_cloned(skb)) | |
1250 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1251 | else | |
1252 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1253 | ||
1254 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1255 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1256 | wiphy_name(local->hw.wiphy)); | |
1257 | return -ENOMEM; | |
1258 | } | |
1259 | ||
1260 | /* update truesize too */ | |
1261 | skb->truesize += head_need + tail_need; | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
8ef9dad3 | 1266 | int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev) |
e2ebc74d | 1267 | { |
133b8226 JB |
1268 | struct ieee80211_master_priv *mpriv = netdev_priv(dev); |
1269 | struct ieee80211_local *local = mpriv->local; | |
e039fa4a | 1270 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1271 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1272 | struct net_device *odev = NULL; |
1273 | struct ieee80211_sub_if_data *osdata; | |
1274 | int headroom; | |
23c0752a | 1275 | bool may_encrypt; |
25d834e1 JB |
1276 | enum { |
1277 | NOT_MONITOR, | |
1278 | FOUND_SDATA, | |
1279 | UNKNOWN_ADDRESS, | |
1280 | } monitor_iface = NOT_MONITOR; | |
e2ebc74d JB |
1281 | int ret; |
1282 | ||
d0f09804 JB |
1283 | if (skb->iif) |
1284 | odev = dev_get_by_index(&init_net, skb->iif); | |
133b8226 | 1285 | if (unlikely(odev && !is_ieee80211_device(local, odev))) { |
e2ebc74d JB |
1286 | dev_put(odev); |
1287 | odev = NULL; | |
1288 | } | |
1289 | if (unlikely(!odev)) { | |
1290 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1291 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1292 | "originating device\n", dev->name); | |
1293 | #endif | |
1294 | dev_kfree_skb(skb); | |
1295 | return 0; | |
1296 | } | |
e039fa4a | 1297 | |
4be8c387 | 1298 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
46f2c4bd | 1299 | local->hw.conf.dynamic_ps_timeout > 0) { |
d063ed0f VN |
1300 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
1301 | ieee80211_stop_queues_by_reason(&local->hw, | |
1302 | IEEE80211_QUEUE_STOP_REASON_PS); | |
1303 | queue_work(local->hw.workqueue, | |
1304 | &local->dynamic_ps_disable_work); | |
1305 | } | |
1306 | ||
1307 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
46f2c4bd | 1308 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
d063ed0f VN |
1309 | } |
1310 | ||
d0f09804 JB |
1311 | memset(info, 0, sizeof(*info)); |
1312 | ||
1313 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1314 | ||
e2ebc74d JB |
1315 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1316 | ||
e32f85f7 LCC |
1317 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1318 | ieee80211_is_data(hdr->frame_control)) { | |
f74b6a54 RR |
1319 | if (is_multicast_ether_addr(hdr->addr3)) |
1320 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1321 | else | |
5dc306f3 BC |
1322 | if (mesh_nexthop_lookup(skb, osdata)) { |
1323 | dev_put(odev); | |
1324 | return 0; | |
1325 | } | |
f74b6a54 RR |
1326 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) |
1327 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh, | |
1328 | fwded_frames); | |
25d834e1 JB |
1329 | } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
1330 | struct ieee80211_sub_if_data *sdata; | |
25d834e1 JB |
1331 | int hdrlen; |
1332 | u16 len_rthdr; | |
1333 | ||
1334 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
1335 | monitor_iface = UNKNOWN_ADDRESS; | |
1336 | ||
1337 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1338 | hdr = (struct ieee80211_hdr *)skb->data + len_rthdr; | |
1339 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1340 | ||
1341 | /* check the header is complete in the frame */ | |
1342 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1343 | /* | |
1344 | * We process outgoing injected frames that have a | |
1345 | * local address we handle as though they are our | |
1346 | * own frames. | |
1347 | * This code here isn't entirely correct, the local | |
1348 | * MAC address is not necessarily enough to find | |
1349 | * the interface to use; for that proper VLAN/WDS | |
1350 | * support we will need a different mechanism. | |
1351 | */ | |
1352 | ||
1353 | rcu_read_lock(); | |
1354 | list_for_each_entry_rcu(sdata, &local->interfaces, | |
1355 | list) { | |
1356 | if (!netif_running(sdata->dev)) | |
1357 | continue; | |
1358 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1359 | hdr->addr2)) { | |
1360 | dev_hold(sdata->dev); | |
1361 | dev_put(odev); | |
1362 | osdata = sdata; | |
1363 | odev = osdata->dev; | |
1364 | skb->iif = sdata->dev->ifindex; | |
1365 | monitor_iface = FOUND_SDATA; | |
1366 | break; | |
1367 | } | |
1368 | } | |
1369 | rcu_read_unlock(); | |
1370 | } | |
e32f85f7 LCC |
1371 | } |
1372 | ||
d0f09804 | 1373 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1374 | |
1375 | headroom = osdata->local->tx_headroom; | |
1376 | if (may_encrypt) | |
1377 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1378 | headroom -= skb_headroom(skb); | |
1379 | headroom = max_t(int, 0, headroom); | |
1380 | ||
1381 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1382 | dev_kfree_skb(skb); | |
1383 | dev_put(odev); | |
1384 | return 0; | |
e2ebc74d JB |
1385 | } |
1386 | ||
30613070 JB |
1387 | if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
1388 | osdata = container_of(osdata->bss, | |
1389 | struct ieee80211_sub_if_data, | |
1390 | u.ap); | |
25d834e1 JB |
1391 | if (likely(monitor_iface != UNKNOWN_ADDRESS)) |
1392 | info->control.vif = &osdata->vif; | |
e039fa4a | 1393 | ret = ieee80211_tx(odev, skb); |
e2ebc74d JB |
1394 | dev_put(odev); |
1395 | ||
1396 | return ret; | |
1397 | } | |
1398 | ||
1399 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1400 | struct net_device *dev) | |
1401 | { | |
1402 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1403 | struct ieee80211_radiotap_header *prthdr = |
1404 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1405 | u16 len_rthdr; |
e2ebc74d | 1406 | |
9b8a74e3 AG |
1407 | /* check for not even having the fixed radiotap header part */ |
1408 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1409 | goto fail; /* too short to be possibly valid */ | |
1410 | ||
1411 | /* is it a header version we can trust to find length from? */ | |
1412 | if (unlikely(prthdr->it_version)) | |
1413 | goto fail; /* only version 0 is supported */ | |
1414 | ||
1415 | /* then there must be a radiotap header with a length we can use */ | |
1416 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1417 | ||
1418 | /* does the skb contain enough to deliver on the alleged length? */ | |
1419 | if (unlikely(skb->len < len_rthdr)) | |
1420 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1421 | |
1422 | skb->dev = local->mdev; | |
1423 | ||
9b8a74e3 | 1424 | /* needed because we set skb device to master */ |
d0f09804 | 1425 | skb->iif = dev->ifindex; |
9b8a74e3 | 1426 | |
d0f09804 JB |
1427 | /* sometimes we do encrypt injected frames, will be fixed |
1428 | * up in radiotap parser if not wanted */ | |
1429 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1430 | |
e2ebc74d JB |
1431 | /* |
1432 | * fix up the pointers accounting for the radiotap | |
1433 | * header still being in there. We are being given | |
1434 | * a precooked IEEE80211 header so no need for | |
1435 | * normal processing | |
1436 | */ | |
9b8a74e3 | 1437 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1438 | /* |
9b8a74e3 AG |
1439 | * these are just fixed to the end of the rt area since we |
1440 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1441 | */ |
9b8a74e3 AG |
1442 | skb_set_network_header(skb, len_rthdr); |
1443 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1444 | |
9b8a74e3 AG |
1445 | /* pass the radiotap header up to the next stage intact */ |
1446 | dev_queue_xmit(skb); | |
e2ebc74d | 1447 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1448 | |
1449 | fail: | |
1450 | dev_kfree_skb(skb); | |
1451 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1452 | } |
1453 | ||
1454 | /** | |
1455 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1456 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1457 | * @skb: packet to be sent | |
1458 | * @dev: incoming interface | |
1459 | * | |
1460 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1461 | * not be freed, and caller is responsible for either retrying later or freeing | |
1462 | * skb). | |
1463 | * | |
1464 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1465 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1466 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1467 | * transmission (through low-level driver). | |
1468 | */ | |
1469 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1470 | struct net_device *dev) | |
1471 | { | |
133b8226 JB |
1472 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1473 | struct ieee80211_local *local = sdata->local; | |
e2ebc74d | 1474 | int ret = 1, head_need; |
065e9605 HH |
1475 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1476 | __le16 fc; | |
e2ebc74d | 1477 | struct ieee80211_hdr hdr; |
33b64eb2 | 1478 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1479 | const u8 *encaps_data; |
1480 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1481 | int nh_pos, h_pos; |
e2ebc74d | 1482 | struct sta_info *sta; |
ce3edf6d | 1483 | u32 sta_flags = 0; |
e2ebc74d | 1484 | |
e2ebc74d | 1485 | if (unlikely(skb->len < ETH_HLEN)) { |
e2ebc74d JB |
1486 | ret = 0; |
1487 | goto fail; | |
1488 | } | |
1489 | ||
1490 | nh_pos = skb_network_header(skb) - skb->data; | |
1491 | h_pos = skb_transport_header(skb) - skb->data; | |
1492 | ||
1493 | /* convert Ethernet header to proper 802.11 header (based on | |
1494 | * operation mode) */ | |
1495 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1496 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1497 | |
51fb61e7 | 1498 | switch (sdata->vif.type) { |
05c914fe JB |
1499 | case NL80211_IFTYPE_AP: |
1500 | case NL80211_IFTYPE_AP_VLAN: | |
065e9605 | 1501 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1502 | /* DA BSSID SA */ |
1503 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1504 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1505 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1506 | hdrlen = 24; | |
cf966838 | 1507 | break; |
05c914fe | 1508 | case NL80211_IFTYPE_WDS: |
065e9605 | 1509 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1510 | /* RA TA DA SA */ |
1511 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1512 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1513 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1514 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1515 | hdrlen = 30; | |
cf966838 | 1516 | break; |
33b64eb2 | 1517 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1518 | case NL80211_IFTYPE_MESH_POINT: |
065e9605 | 1519 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
472dbc45 | 1520 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1521 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1522 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
e32f85f7 LCC |
1523 | ret = 0; |
1524 | goto fail; | |
33b64eb2 | 1525 | } |
79617dee Y |
1526 | memset(&mesh_hdr, 0, sizeof(mesh_hdr)); |
1527 | ||
1528 | if (compare_ether_addr(dev->dev_addr, | |
1529 | skb->data + ETH_ALEN) == 0) { | |
1530 | /* RA TA DA SA */ | |
1531 | memset(hdr.addr1, 0, ETH_ALEN); | |
1532 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1533 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1534 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1535 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); | |
1536 | } else { | |
1537 | /* packet from other interface */ | |
1538 | struct mesh_path *mppath; | |
1539 | ||
1540 | memset(hdr.addr1, 0, ETH_ALEN); | |
1541 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1542 | memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN); | |
1543 | ||
1544 | if (is_multicast_ether_addr(skb->data)) | |
1545 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1546 | else { | |
1547 | rcu_read_lock(); | |
1548 | mppath = mpp_path_lookup(skb->data, sdata); | |
1549 | if (mppath) | |
1550 | memcpy(hdr.addr3, mppath->mpp, ETH_ALEN); | |
1551 | else | |
1552 | memset(hdr.addr3, 0xff, ETH_ALEN); | |
1553 | rcu_read_unlock(); | |
1554 | } | |
1555 | ||
1556 | mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6; | |
1557 | mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; | |
1558 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum); | |
1559 | memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN); | |
1560 | memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1561 | sdata->u.mesh.mesh_seqnum++; | |
1562 | meshhdrlen = 18; | |
1563 | } | |
33b64eb2 LCC |
1564 | hdrlen = 30; |
1565 | break; | |
1566 | #endif | |
05c914fe | 1567 | case NL80211_IFTYPE_STATION: |
065e9605 | 1568 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1569 | /* BSSID SA DA */ |
1570 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1571 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1572 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1573 | hdrlen = 24; | |
cf966838 | 1574 | break; |
05c914fe | 1575 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1576 | /* DA SA BSSID */ |
1577 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1578 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1579 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1580 | hdrlen = 24; | |
cf966838 JB |
1581 | break; |
1582 | default: | |
e2ebc74d JB |
1583 | ret = 0; |
1584 | goto fail; | |
1585 | } | |
1586 | ||
7d185b8b JB |
1587 | /* |
1588 | * There's no need to try to look up the destination | |
1589 | * if it is a multicast address (which can only happen | |
1590 | * in AP mode) | |
1591 | */ | |
1592 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1593 | rcu_read_lock(); |
7d185b8b | 1594 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1595 | if (sta) |
07346f81 | 1596 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1597 | rcu_read_unlock(); |
e2ebc74d JB |
1598 | } |
1599 | ||
3434fbd3 | 1600 | /* receiver and we are QoS enabled, use a QoS type frame */ |
e2530083 JB |
1601 | if (sta_flags & WLAN_STA_WME && |
1602 | ieee80211_num_regular_queues(&local->hw) >= 4) { | |
065e9605 | 1603 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1604 | hdrlen += 2; |
1605 | } | |
1606 | ||
1607 | /* | |
238814fd JB |
1608 | * Drop unicast frames to unauthorised stations unless they are |
1609 | * EAPOL frames from the local station. | |
ce3edf6d | 1610 | */ |
e32f85f7 LCC |
1611 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1612 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1613 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1614 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1615 | compare_ether_addr(dev->dev_addr, |
1616 | skb->data + ETH_ALEN) == 0))) { | |
1617 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1618 | if (net_ratelimit()) |
0c68ae26 | 1619 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1620 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1621 | hdr.addr1); |
ce3edf6d JB |
1622 | #endif |
1623 | ||
1624 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1625 | ||
1626 | ret = 0; | |
1627 | goto fail; | |
1628 | } | |
1629 | ||
065e9605 | 1630 | hdr.frame_control = fc; |
e2ebc74d JB |
1631 | hdr.duration_id = 0; |
1632 | hdr.seq_ctrl = 0; | |
1633 | ||
1634 | skip_header_bytes = ETH_HLEN; | |
1635 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1636 | encaps_data = bridge_tunnel_header; | |
1637 | encaps_len = sizeof(bridge_tunnel_header); | |
1638 | skip_header_bytes -= 2; | |
1639 | } else if (ethertype >= 0x600) { | |
1640 | encaps_data = rfc1042_header; | |
1641 | encaps_len = sizeof(rfc1042_header); | |
1642 | skip_header_bytes -= 2; | |
1643 | } else { | |
1644 | encaps_data = NULL; | |
1645 | encaps_len = 0; | |
1646 | } | |
1647 | ||
1648 | skb_pull(skb, skip_header_bytes); | |
1649 | nh_pos -= skip_header_bytes; | |
1650 | h_pos -= skip_header_bytes; | |
1651 | ||
23c0752a | 1652 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1653 | |
23c0752a JB |
1654 | /* |
1655 | * So we need to modify the skb header and hence need a copy of | |
1656 | * that. The head_need variable above doesn't, so far, include | |
1657 | * the needed header space that we don't need right away. If we | |
1658 | * can, then we don't reallocate right now but only after the | |
1659 | * frame arrives at the master device (if it does...) | |
1660 | * | |
1661 | * If we cannot, however, then we will reallocate to include all | |
1662 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1663 | * make it big enough for everything we may ever need. | |
1664 | */ | |
e2ebc74d | 1665 | |
3a5be7d4 | 1666 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1667 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1668 | head_need += local->tx_headroom; | |
1669 | head_need = max_t(int, 0, head_need); | |
1670 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1671 | goto fail; |
e2ebc74d JB |
1672 | } |
1673 | ||
1674 | if (encaps_data) { | |
1675 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1676 | nh_pos += encaps_len; | |
1677 | h_pos += encaps_len; | |
1678 | } | |
c29b9b9b | 1679 | |
33b64eb2 LCC |
1680 | if (meshhdrlen > 0) { |
1681 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1682 | nh_pos += meshhdrlen; | |
1683 | h_pos += meshhdrlen; | |
1684 | } | |
1685 | ||
065e9605 | 1686 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1687 | __le16 *qos_control; |
1688 | ||
1689 | qos_control = (__le16*) skb_push(skb, 2); | |
1690 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1691 | /* | |
1692 | * Maybe we could actually set some fields here, for now just | |
1693 | * initialise to zero to indicate no special operation. | |
1694 | */ | |
1695 | *qos_control = 0; | |
1696 | } else | |
1697 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1698 | ||
e2ebc74d JB |
1699 | nh_pos += hdrlen; |
1700 | h_pos += hdrlen; | |
1701 | ||
d0f09804 | 1702 | skb->iif = dev->ifindex; |
b0a67179 | 1703 | |
e2ebc74d | 1704 | skb->dev = local->mdev; |
68aae116 SH |
1705 | dev->stats.tx_packets++; |
1706 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1707 | |
1708 | /* Update skb pointers to various headers since this modified frame | |
1709 | * is going to go through Linux networking code that may potentially | |
1710 | * need things like pointer to IP header. */ | |
1711 | skb_set_mac_header(skb, 0); | |
1712 | skb_set_network_header(skb, nh_pos); | |
1713 | skb_set_transport_header(skb, h_pos); | |
1714 | ||
1715 | dev->trans_start = jiffies; | |
1716 | dev_queue_xmit(skb); | |
1717 | ||
1718 | return 0; | |
1719 | ||
1720 | fail: | |
1721 | if (!ret) | |
1722 | dev_kfree_skb(skb); | |
1723 | ||
1724 | return ret; | |
1725 | } | |
1726 | ||
e2ebc74d | 1727 | |
e2530083 JB |
1728 | /* |
1729 | * ieee80211_clear_tx_pending may not be called in a context where | |
1730 | * it is possible that it packets could come in again. | |
1731 | */ | |
e2ebc74d JB |
1732 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1733 | { | |
1734 | int i, j; | |
1735 | struct ieee80211_tx_stored_packet *store; | |
1736 | ||
e2530083 JB |
1737 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1738 | if (!test_bit(i, local->queues_pending)) | |
e2ebc74d JB |
1739 | continue; |
1740 | store = &local->pending_packet[i]; | |
1741 | kfree_skb(store->skb); | |
1742 | for (j = 0; j < store->num_extra_frag; j++) | |
1743 | kfree_skb(store->extra_frag[j]); | |
1744 | kfree(store->extra_frag); | |
e2530083 | 1745 | clear_bit(i, local->queues_pending); |
e2ebc74d JB |
1746 | } |
1747 | } | |
1748 | ||
e2530083 JB |
1749 | /* |
1750 | * Transmit all pending packets. Called from tasklet, locks master device | |
1751 | * TX lock so that no new packets can come in. | |
1752 | */ | |
e2ebc74d JB |
1753 | void ieee80211_tx_pending(unsigned long data) |
1754 | { | |
1755 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1756 | struct net_device *dev = local->mdev; | |
1757 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1758 | struct ieee80211_tx_data tx; |
e2530083 | 1759 | int i, ret; |
e2ebc74d JB |
1760 | |
1761 | netif_tx_lock_bh(dev); | |
e2530083 JB |
1762 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1763 | /* Check that this queue is ok */ | |
f8e79ddd TW |
1764 | if (__netif_subqueue_stopped(local->mdev, i) && |
1765 | !test_bit(i, local->queues_pending_run)) | |
e2ebc74d | 1766 | continue; |
e2530083 JB |
1767 | |
1768 | if (!test_bit(i, local->queues_pending)) { | |
f8e79ddd | 1769 | clear_bit(i, local->queues_pending_run); |
e2530083 | 1770 | ieee80211_wake_queue(&local->hw, i); |
e2ebc74d JB |
1771 | continue; |
1772 | } | |
e2530083 | 1773 | |
f8e79ddd TW |
1774 | clear_bit(i, local->queues_pending_run); |
1775 | netif_start_subqueue(local->mdev, i); | |
1776 | ||
e2ebc74d | 1777 | store = &local->pending_packet[i]; |
5cf121c3 JB |
1778 | tx.extra_frag = store->extra_frag; |
1779 | tx.num_extra_frag = store->num_extra_frag; | |
badffb72 | 1780 | tx.flags = 0; |
e2ebc74d JB |
1781 | ret = __ieee80211_tx(local, store->skb, &tx); |
1782 | if (ret) { | |
1783 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1784 | store->skb = NULL; | |
1785 | } else { | |
e2530083 JB |
1786 | clear_bit(i, local->queues_pending); |
1787 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1788 | } |
1789 | } | |
1790 | netif_tx_unlock_bh(dev); | |
e2ebc74d JB |
1791 | } |
1792 | ||
1793 | /* functions for drivers to get certain frames */ | |
1794 | ||
8e7be8da | 1795 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
1796 | struct sk_buff *skb, |
1797 | struct beacon_data *beacon) | |
e2ebc74d JB |
1798 | { |
1799 | u8 *pos, *tim; | |
1800 | int aid0 = 0; | |
1801 | int i, have_bits = 0, n1, n2; | |
1802 | ||
1803 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1804 | * mode. */ | |
e2ebc74d JB |
1805 | if (atomic_read(&bss->num_sta_ps) > 0) |
1806 | /* in the hope that this is faster than | |
1807 | * checking byte-for-byte */ | |
1808 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1809 | IEEE80211_MAX_AID+1); | |
1810 | ||
1811 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1812 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1813 | else |
1814 | bss->dtim_count--; | |
1815 | ||
1816 | tim = pos = (u8 *) skb_put(skb, 6); | |
1817 | *pos++ = WLAN_EID_TIM; | |
1818 | *pos++ = 4; | |
1819 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1820 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1821 | |
1822 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1823 | aid0 = 1; | |
1824 | ||
1825 | if (have_bits) { | |
1826 | /* Find largest even number N1 so that bits numbered 1 through | |
1827 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1828 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1829 | n1 = 0; | |
1830 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1831 | if (bss->tim[i]) { | |
1832 | n1 = i & 0xfe; | |
1833 | break; | |
1834 | } | |
1835 | } | |
1836 | n2 = n1; | |
1837 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1838 | if (bss->tim[i]) { | |
1839 | n2 = i; | |
1840 | break; | |
1841 | } | |
1842 | } | |
1843 | ||
1844 | /* Bitmap control */ | |
1845 | *pos++ = n1 | aid0; | |
1846 | /* Part Virt Bitmap */ | |
1847 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1848 | ||
1849 | tim[1] = n2 - n1 + 4; | |
1850 | skb_put(skb, n2 - n1); | |
1851 | } else { | |
1852 | *pos++ = aid0; /* Bitmap control */ | |
1853 | *pos++ = 0; /* Part Virt Bitmap */ | |
1854 | } | |
e2ebc74d JB |
1855 | } |
1856 | ||
32bfd35d | 1857 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1858 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1859 | { |
1860 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 1861 | struct sk_buff *skb = NULL; |
e039fa4a | 1862 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1863 | struct ieee80211_sub_if_data *sdata = NULL; |
1864 | struct ieee80211_if_ap *ap = NULL; | |
9d139c81 | 1865 | struct ieee80211_if_sta *ifsta = NULL; |
5dfdaf58 | 1866 | struct beacon_data *beacon; |
8318d78a | 1867 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 1868 | enum ieee80211_band band = local->hw.conf.channel->band; |
8318d78a | 1869 | |
2e92e6f2 | 1870 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1871 | |
1872 | rcu_read_lock(); | |
e2ebc74d | 1873 | |
32bfd35d | 1874 | sdata = vif_to_sdata(vif); |
e2ebc74d | 1875 | |
05c914fe | 1876 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
1877 | ap = &sdata->u.ap; |
1878 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1879 | if (ap && beacon) { |
1880 | /* | |
1881 | * headroom, head length, | |
1882 | * tail length and maximum TIM length | |
1883 | */ | |
1884 | skb = dev_alloc_skb(local->tx_headroom + | |
1885 | beacon->head_len + | |
1886 | beacon->tail_len + 256); | |
1887 | if (!skb) | |
1888 | goto out; | |
33b64eb2 | 1889 | |
902acc78 JB |
1890 | skb_reserve(skb, local->tx_headroom); |
1891 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1892 | beacon->head_len); | |
33b64eb2 | 1893 | |
d0709a65 JB |
1894 | /* |
1895 | * Not very nice, but we want to allow the driver to call | |
1896 | * ieee80211_beacon_get() as a response to the set_tim() | |
1897 | * callback. That, however, is already invoked under the | |
1898 | * sta_lock to guarantee consistent and race-free update | |
1899 | * of the tim bitmap in mac80211 and the driver. | |
1900 | */ | |
1901 | if (local->tim_in_locked_section) { | |
8e7be8da | 1902 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
1903 | } else { |
1904 | unsigned long flags; | |
1905 | ||
1906 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 1907 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
1908 | spin_unlock_irqrestore(&local->sta_lock, flags); |
1909 | } | |
33b64eb2 | 1910 | |
902acc78 JB |
1911 | if (beacon->tail) |
1912 | memcpy(skb_put(skb, beacon->tail_len), | |
1913 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
1914 | } else |
1915 | goto out; | |
05c914fe | 1916 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
9d139c81 JB |
1917 | struct ieee80211_hdr *hdr; |
1918 | ifsta = &sdata->u.sta; | |
33b64eb2 | 1919 | |
9d139c81 JB |
1920 | if (!ifsta->probe_resp) |
1921 | goto out; | |
1922 | ||
1923 | skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC); | |
1924 | if (!skb) | |
1925 | goto out; | |
1926 | ||
1927 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
1928 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1929 | IEEE80211_STYPE_BEACON); | |
9d139c81 | 1930 | |
902acc78 | 1931 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
1932 | struct ieee80211_mgmt *mgmt; |
1933 | u8 *pos; | |
1934 | ||
902acc78 JB |
1935 | /* headroom, head length, tail length and maximum TIM length */ |
1936 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1937 | if (!skb) | |
1938 | goto out; | |
1939 | ||
1940 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1941 | mgmt = (struct ieee80211_mgmt *) | |
1942 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1943 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
1944 | mgmt->frame_control = |
1945 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
1946 | memset(mgmt->da, 0xff, ETH_ALEN); |
1947 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1948 | /* BSSID is left zeroed, wildcard value */ | |
1949 | mgmt->u.beacon.beacon_int = | |
1950 | cpu_to_le16(local->hw.conf.beacon_int); | |
1951 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1952 | ||
1953 | pos = skb_put(skb, 2); | |
1954 | *pos++ = WLAN_EID_SSID; | |
1955 | *pos++ = 0x0; | |
1956 | ||
f698d856 | 1957 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
1958 | } else { |
1959 | WARN_ON(1); | |
5dfdaf58 | 1960 | goto out; |
e2ebc74d JB |
1961 | } |
1962 | ||
e039fa4a JB |
1963 | info = IEEE80211_SKB_CB(skb); |
1964 | ||
d0f09804 JB |
1965 | skb->do_not_encrypt = 1; |
1966 | ||
e039fa4a | 1967 | info->band = band; |
e6a9854b JB |
1968 | /* |
1969 | * XXX: For now, always use the lowest rate | |
1970 | */ | |
1971 | info->control.rates[0].idx = 0; | |
1972 | info->control.rates[0].count = 1; | |
1973 | info->control.rates[1].idx = -1; | |
1974 | info->control.rates[2].idx = -1; | |
1975 | info->control.rates[3].idx = -1; | |
1976 | info->control.rates[4].idx = -1; | |
1977 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
e039fa4a JB |
1978 | |
1979 | info->control.vif = vif; | |
f591fa5d JB |
1980 | |
1981 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
1982 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1983 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e6a9854b | 1984 | out: |
5dfdaf58 | 1985 | rcu_read_unlock(); |
e2ebc74d JB |
1986 | return skb; |
1987 | } | |
1988 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1989 | ||
32bfd35d | 1990 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1991 | const void *frame, size_t frame_len, |
e039fa4a | 1992 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1993 | struct ieee80211_rts *rts) |
1994 | { | |
1995 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1996 | |
065e9605 HH |
1997 | rts->frame_control = |
1998 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
1999 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2000 | frame_txctl); | |
e2ebc74d JB |
2001 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2002 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2003 | } | |
2004 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2005 | ||
32bfd35d | 2006 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2007 | const void *frame, size_t frame_len, |
e039fa4a | 2008 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2009 | struct ieee80211_cts *cts) |
2010 | { | |
2011 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2012 | |
065e9605 HH |
2013 | cts->frame_control = |
2014 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2015 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2016 | frame_len, frame_txctl); | |
e2ebc74d JB |
2017 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2018 | } | |
2019 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2020 | ||
2021 | struct sk_buff * | |
32bfd35d | 2022 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2023 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2024 | { |
2025 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2026 | struct sk_buff *skb = NULL; |
e2ebc74d | 2027 | struct sta_info *sta; |
5cf121c3 | 2028 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2029 | struct ieee80211_sub_if_data *sdata; |
2030 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2031 | struct beacon_data *beacon; |
e039fa4a | 2032 | struct ieee80211_tx_info *info; |
e2ebc74d | 2033 | |
32bfd35d | 2034 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2035 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2036 | |
2037 | if (!bss) | |
e2ebc74d JB |
2038 | return NULL; |
2039 | ||
5dfdaf58 JB |
2040 | rcu_read_lock(); |
2041 | beacon = rcu_dereference(bss->beacon); | |
2042 | ||
05c914fe | 2043 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2044 | goto out; |
5dfdaf58 | 2045 | |
e2ebc74d | 2046 | if (bss->dtim_count != 0) |
747cf5e9 | 2047 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2048 | |
e2ebc74d JB |
2049 | while (1) { |
2050 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2051 | if (!skb) | |
747cf5e9 | 2052 | goto out; |
e2ebc74d JB |
2053 | local->total_ps_buffered--; |
2054 | ||
2055 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2056 | struct ieee80211_hdr *hdr = | |
2057 | (struct ieee80211_hdr *) skb->data; | |
2058 | /* more buffered multicast/broadcast frames ==> set | |
2059 | * MoreData flag in IEEE 802.11 header to inform PS | |
2060 | * STAs */ | |
2061 | hdr->frame_control |= | |
2062 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2063 | } | |
2064 | ||
133b8226 | 2065 | if (!ieee80211_tx_prepare(local, &tx, skb)) |
e2ebc74d JB |
2066 | break; |
2067 | dev_kfree_skb_any(skb); | |
2068 | } | |
e039fa4a JB |
2069 | |
2070 | info = IEEE80211_SKB_CB(skb); | |
2071 | ||
e2ebc74d | 2072 | sta = tx.sta; |
5cf121c3 JB |
2073 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2074 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2075 | info->band = tx.channel->band; |
e2ebc74d | 2076 | |
97b045d6 | 2077 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2078 | skb = NULL; |
97b045d6 | 2079 | out: |
d0709a65 | 2080 | rcu_read_unlock(); |
e2ebc74d JB |
2081 | |
2082 | return skb; | |
2083 | } | |
2084 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |