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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; |
e2ebc74d | 49 | |
2e92e6f2 JB |
50 | sband = local->hw.wiphy->bands[tx->channel->band]; |
51 | txrate = &sband->bitrates[tx->rate_idx]; | |
8318d78a JB |
52 | |
53 | erp = 0; | |
54 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
55 | erp = txrate->flags & IEEE80211_RATE_ERP_G; | |
e2ebc74d JB |
56 | |
57 | /* | |
58 | * data and mgmt (except PS Poll): | |
59 | * - during CFP: 32768 | |
60 | * - during contention period: | |
61 | * if addr1 is group address: 0 | |
62 | * if more fragments = 0 and addr1 is individual address: time to | |
63 | * transmit one ACK plus SIFS | |
64 | * if more fragments = 1 and addr1 is individual address: time to | |
65 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
66 | * | |
67 | * IEEE 802.11, 9.6: | |
68 | * - control response frame (CTS or ACK) shall be transmitted using the | |
69 | * same rate as the immediately previous frame in the frame exchange | |
70 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
71 | * at the highest possible rate belonging to the PHY rates in the | |
72 | * BSSBasicRateSet | |
73 | */ | |
358c8d9d HH |
74 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
75 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d | 76 | /* TODO: These control frames are not currently sent by |
ccd7b362 | 77 | * mac80211, but should they be implemented, this function |
e2ebc74d JB |
78 | * needs to be updated to support duration field calculation. |
79 | * | |
80 | * RTS: time needed to transmit pending data/mgmt frame plus | |
81 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
82 | * CTS: duration of immediately previous RTS minus time | |
83 | * required to transmit CTS and its SIFS | |
84 | * ACK: 0 if immediately previous directed data/mgmt had | |
85 | * more=0, with more=1 duration in ACK frame is duration | |
86 | * from previous frame minus time needed to transmit ACK | |
87 | * and its SIFS | |
88 | * PS Poll: BIT(15) | BIT(14) | aid | |
89 | */ | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /* data/mgmt */ | |
94 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 95 | return cpu_to_le16(32768); |
e2ebc74d JB |
96 | |
97 | if (group_addr) /* Group address as the destination - no ACK */ | |
98 | return 0; | |
99 | ||
100 | /* Individual destination address: | |
101 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
102 | * CTS and ACK frames shall be transmitted using the highest rate in | |
103 | * basic rate set that is less than or equal to the rate of the | |
104 | * immediately previous frame and that is using the same modulation | |
105 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
106 | * the highest mandatory rate of the PHY that is less than or equal to | |
107 | * the rate of the previous frame is used. | |
108 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
109 | */ | |
110 | rate = -1; | |
8318d78a JB |
111 | /* use lowest available if everything fails */ |
112 | mrate = sband->bitrates[0].bitrate; | |
113 | for (i = 0; i < sband->n_bitrates; i++) { | |
114 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 115 | |
8318d78a JB |
116 | if (r->bitrate > txrate->bitrate) |
117 | break; | |
e2ebc74d | 118 | |
96dd22ac | 119 | if (tx->sdata->bss_conf.basic_rates & BIT(i)) |
8318d78a JB |
120 | rate = r->bitrate; |
121 | ||
122 | switch (sband->band) { | |
123 | case IEEE80211_BAND_2GHZ: { | |
124 | u32 flag; | |
125 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
126 | flag = IEEE80211_RATE_MANDATORY_G; | |
127 | else | |
128 | flag = IEEE80211_RATE_MANDATORY_B; | |
129 | if (r->flags & flag) | |
130 | mrate = r->bitrate; | |
131 | break; | |
132 | } | |
133 | case IEEE80211_BAND_5GHZ: | |
134 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
135 | mrate = r->bitrate; | |
136 | break; | |
137 | case IEEE80211_NUM_BANDS: | |
138 | WARN_ON(1); | |
139 | break; | |
140 | } | |
e2ebc74d JB |
141 | } |
142 | if (rate == -1) { | |
143 | /* No matching basic rate found; use highest suitable mandatory | |
144 | * PHY rate */ | |
145 | rate = mrate; | |
146 | } | |
147 | ||
148 | /* Time needed to transmit ACK | |
149 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
150 | * to closest integer */ | |
151 | ||
152 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
471b3efd | 153 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
154 | |
155 | if (next_frag_len) { | |
156 | /* Frame is fragmented: duration increases with time needed to | |
157 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
158 | dur *= 2; /* ACK + SIFS */ | |
159 | /* next fragment */ | |
160 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 161 | txrate->bitrate, erp, |
471b3efd | 162 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
163 | } |
164 | ||
03f93c3d | 165 | return cpu_to_le16(dur); |
e2ebc74d JB |
166 | } |
167 | ||
e2ebc74d JB |
168 | static int inline is_ieee80211_device(struct net_device *dev, |
169 | struct net_device *master) | |
170 | { | |
171 | return (wdev_priv(dev->ieee80211_ptr) == | |
172 | wdev_priv(master->ieee80211_ptr)); | |
173 | } | |
174 | ||
175 | /* tx handlers */ | |
176 | ||
d9e8a70f | 177 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 178 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 179 | { |
358c8d9d | 180 | |
e039fa4a | 181 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 182 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
183 | u32 sta_flags; |
184 | ||
e039fa4a | 185 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 186 | return TX_CONTINUE; |
58d4185e | 187 | |
c2b13452 | 188 | if (unlikely(tx->local->sw_scanning) && |
358c8d9d | 189 | !ieee80211_is_probe_req(hdr->frame_control)) |
9ae54c84 | 190 | return TX_DROP; |
e2ebc74d | 191 | |
05c914fe | 192 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
193 | return TX_CONTINUE; |
194 | ||
5cf121c3 | 195 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 196 | return TX_CONTINUE; |
e2ebc74d | 197 | |
07346f81 | 198 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 199 | |
5cf121c3 | 200 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 201 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 202 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 203 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d | 204 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0795af57 | 205 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 206 | printk(KERN_DEBUG "%s: dropped data frame to not " |
0795af57 JP |
207 | "associated station %s\n", |
208 | tx->dev->name, print_mac(mac, hdr->addr1)); | |
e2ebc74d JB |
209 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
210 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 211 | return TX_DROP; |
e2ebc74d JB |
212 | } |
213 | } else { | |
358c8d9d | 214 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 215 | tx->local->num_sta == 0 && |
05c914fe | 216 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
217 | /* |
218 | * No associated STAs - no need to send multicast | |
219 | * frames. | |
220 | */ | |
9ae54c84 | 221 | return TX_DROP; |
e2ebc74d | 222 | } |
9ae54c84 | 223 | return TX_CONTINUE; |
e2ebc74d JB |
224 | } |
225 | ||
9ae54c84 | 226 | return TX_CONTINUE; |
e2ebc74d JB |
227 | } |
228 | ||
e2ebc74d JB |
229 | /* This function is called whenever the AP is about to exceed the maximum limit |
230 | * of buffered frames for power saving STAs. This situation should not really | |
231 | * happen often during normal operation, so dropping the oldest buffered packet | |
232 | * from each queue should be OK to make some room for new frames. */ | |
233 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
234 | { | |
235 | int total = 0, purged = 0; | |
236 | struct sk_buff *skb; | |
237 | struct ieee80211_sub_if_data *sdata; | |
238 | struct sta_info *sta; | |
239 | ||
79010420 JB |
240 | /* |
241 | * virtual interfaces are protected by RCU | |
242 | */ | |
243 | rcu_read_lock(); | |
244 | ||
245 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 246 | struct ieee80211_if_ap *ap; |
05c914fe | 247 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
248 | continue; |
249 | ap = &sdata->u.ap; | |
250 | skb = skb_dequeue(&ap->ps_bc_buf); | |
251 | if (skb) { | |
252 | purged++; | |
253 | dev_kfree_skb(skb); | |
254 | } | |
255 | total += skb_queue_len(&ap->ps_bc_buf); | |
256 | } | |
e2ebc74d | 257 | |
d0709a65 | 258 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
259 | skb = skb_dequeue(&sta->ps_tx_buf); |
260 | if (skb) { | |
261 | purged++; | |
262 | dev_kfree_skb(skb); | |
263 | } | |
264 | total += skb_queue_len(&sta->ps_tx_buf); | |
265 | } | |
d0709a65 JB |
266 | |
267 | rcu_read_unlock(); | |
e2ebc74d JB |
268 | |
269 | local->total_ps_buffered = total; | |
54223995 | 270 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 271 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 272 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 273 | #endif |
e2ebc74d JB |
274 | } |
275 | ||
9ae54c84 | 276 | static ieee80211_tx_result |
5cf121c3 | 277 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 278 | { |
e039fa4a | 279 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 280 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 281 | |
7d54d0dd JB |
282 | /* |
283 | * broadcast/multicast frame | |
284 | * | |
285 | * If any of the associated stations is in power save mode, | |
286 | * the frame is buffered to be sent after DTIM beacon frame. | |
287 | * This is done either by the hardware or us. | |
288 | */ | |
289 | ||
3e122be0 JB |
290 | /* powersaving STAs only in AP/VLAN mode */ |
291 | if (!tx->sdata->bss) | |
292 | return TX_CONTINUE; | |
293 | ||
294 | /* no buffering for ordered frames */ | |
358c8d9d | 295 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 296 | return TX_CONTINUE; |
7d54d0dd JB |
297 | |
298 | /* no stations in PS mode */ | |
299 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 300 | return TX_CONTINUE; |
7d54d0dd JB |
301 | |
302 | /* buffered in mac80211 */ | |
303 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
304 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
305 | purge_old_ps_buffers(tx->local); | |
306 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
307 | AP_MAX_BC_BUFFER) { | |
54223995 | 308 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d JB |
309 | if (net_ratelimit()) { |
310 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
311 | "dropping the oldest frame\n", | |
312 | tx->dev->name); | |
313 | } | |
f4ea83dd | 314 | #endif |
e2ebc74d JB |
315 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
316 | } else | |
317 | tx->local->total_ps_buffered++; | |
318 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 319 | return TX_QUEUED; |
e2ebc74d JB |
320 | } |
321 | ||
7d54d0dd | 322 | /* buffered in hardware */ |
e039fa4a | 323 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 324 | |
9ae54c84 | 325 | return TX_CONTINUE; |
e2ebc74d JB |
326 | } |
327 | ||
9ae54c84 | 328 | static ieee80211_tx_result |
5cf121c3 | 329 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
330 | { |
331 | struct sta_info *sta = tx->sta; | |
e039fa4a | 332 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 333 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
07346f81 | 334 | u32 staflags; |
0795af57 | 335 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 336 | |
358c8d9d | 337 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control))) |
9ae54c84 | 338 | return TX_CONTINUE; |
e2ebc74d | 339 | |
07346f81 JB |
340 | staflags = get_sta_flags(sta); |
341 | ||
342 | if (unlikely((staflags & WLAN_STA_PS) && | |
343 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 344 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 | 345 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 346 | "before %d)\n", |
17741cdc | 347 | print_mac(mac, sta->sta.addr), sta->sta.aid, |
e2ebc74d JB |
348 | skb_queue_len(&sta->ps_tx_buf)); |
349 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
350 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
351 | purge_old_ps_buffers(tx->local); | |
352 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
353 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 354 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 355 | if (net_ratelimit()) { |
0795af57 | 356 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 357 | "buffer full - dropping oldest frame\n", |
17741cdc | 358 | tx->dev->name, print_mac(mac, sta->sta.addr)); |
e2ebc74d | 359 | } |
f4ea83dd | 360 | #endif |
e2ebc74d JB |
361 | dev_kfree_skb(old); |
362 | } else | |
363 | tx->local->total_ps_buffered++; | |
004c872e | 364 | |
e2ebc74d | 365 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
366 | if (skb_queue_empty(&sta->ps_tx_buf)) |
367 | sta_info_set_tim_bit(sta); | |
368 | ||
e039fa4a | 369 | info->control.jiffies = jiffies; |
e2ebc74d | 370 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 371 | return TX_QUEUED; |
e2ebc74d JB |
372 | } |
373 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 374 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0795af57 | 375 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 376 | "set -> send frame\n", tx->dev->name, |
17741cdc | 377 | print_mac(mac, sta->sta.addr)); |
e2ebc74d JB |
378 | } |
379 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 380 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 381 | |
9ae54c84 | 382 | return TX_CONTINUE; |
e2ebc74d JB |
383 | } |
384 | ||
d9e8a70f | 385 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 386 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 387 | { |
5cf121c3 | 388 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 389 | return TX_CONTINUE; |
e2ebc74d | 390 | |
5cf121c3 | 391 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
392 | return ieee80211_tx_h_unicast_ps_buf(tx); |
393 | else | |
394 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
395 | } | |
396 | ||
d9e8a70f | 397 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 398 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 399 | { |
d4e46a3d | 400 | struct ieee80211_key *key; |
e039fa4a | 401 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 402 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 403 | |
d0f09804 | 404 | if (unlikely(tx->skb->do_not_encrypt)) |
e2ebc74d | 405 | tx->key = NULL; |
d4e46a3d JB |
406 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
407 | tx->key = key; | |
408 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
409 | tx->key = key; | |
e2ebc74d | 410 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 411 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e039fa4a | 412 | !(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
e2ebc74d | 413 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 414 | return TX_DROP; |
176e4f84 | 415 | } else |
e2ebc74d JB |
416 | tx->key = NULL; |
417 | ||
418 | if (tx->key) { | |
419 | tx->key->tx_rx_count++; | |
011bfcc4 | 420 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
421 | |
422 | switch (tx->key->conf.alg) { | |
423 | case ALG_WEP: | |
358c8d9d | 424 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
425 | break; |
426 | case ALG_TKIP: | |
427 | case ALG_CCMP: | |
358c8d9d | 428 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
429 | tx->key = NULL; |
430 | break; | |
431 | } | |
e2ebc74d JB |
432 | } |
433 | ||
176e4f84 | 434 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
d0f09804 | 435 | tx->skb->do_not_encrypt = 1; |
176e4f84 | 436 | |
9ae54c84 | 437 | return TX_CONTINUE; |
e2ebc74d JB |
438 | } |
439 | ||
d9e8a70f | 440 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 441 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 442 | { |
1abbe498 | 443 | struct rate_selection rsel; |
8318d78a | 444 | struct ieee80211_supported_band *sband; |
e039fa4a | 445 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
8318d78a | 446 | |
2e92e6f2 | 447 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d | 448 | |
2e92e6f2 | 449 | if (likely(tx->rate_idx < 0)) { |
8318d78a | 450 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
ae17e986 JB |
451 | if (tx->sta) |
452 | tx->sta->last_txrate_idx = rsel.rate_idx; | |
2e92e6f2 JB |
453 | tx->rate_idx = rsel.rate_idx; |
454 | if (unlikely(rsel.probe_idx >= 0)) { | |
e039fa4a | 455 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
5cf121c3 | 456 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e039fa4a | 457 | info->control.alt_retry_rate_idx = tx->rate_idx; |
2e92e6f2 | 458 | tx->rate_idx = rsel.probe_idx; |
58d4185e | 459 | } else |
e039fa4a | 460 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 461 | |
2e92e6f2 | 462 | if (unlikely(tx->rate_idx < 0)) |
9ae54c84 | 463 | return TX_DROP; |
58d4185e | 464 | } else |
e039fa4a | 465 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 466 | |
8318d78a | 467 | if (tx->sdata->bss_conf.use_cts_prot && |
2e92e6f2 JB |
468 | (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) { |
469 | tx->last_frag_rate_idx = tx->rate_idx; | |
470 | if (rsel.probe_idx >= 0) | |
5cf121c3 | 471 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 472 | else |
5cf121c3 | 473 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
2e92e6f2 | 474 | tx->rate_idx = rsel.nonerp_idx; |
e039fa4a JB |
475 | info->tx_rate_idx = rsel.nonerp_idx; |
476 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 477 | } else { |
2e92e6f2 | 478 | tx->last_frag_rate_idx = tx->rate_idx; |
e039fa4a | 479 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 480 | } |
e039fa4a | 481 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 482 | |
9ae54c84 | 483 | return TX_CONTINUE; |
e2ebc74d JB |
484 | } |
485 | ||
d9e8a70f | 486 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 487 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d | 488 | { |
065e9605 | 489 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 490 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
2e92e6f2 JB |
491 | struct ieee80211_supported_band *sband; |
492 | ||
493 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
e2ebc74d | 494 | |
e039fa4a | 495 | if (tx->sta) |
17741cdc | 496 | info->control.sta = &tx->sta->sta; |
e039fa4a JB |
497 | |
498 | if (!info->control.retry_limit) { | |
58d4185e | 499 | if (!is_multicast_ether_addr(hdr->addr1)) { |
e039fa4a JB |
500 | int len = min_t(int, tx->skb->len + FCS_LEN, |
501 | tx->local->fragmentation_threshold); | |
502 | if (len > tx->local->rts_threshold | |
58d4185e | 503 | && tx->local->rts_threshold < |
e039fa4a JB |
504 | IEEE80211_MAX_RTS_THRESHOLD) { |
505 | info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS; | |
506 | info->flags |= | |
507 | IEEE80211_TX_CTL_LONG_RETRY_LIMIT; | |
508 | info->control.retry_limit = | |
58d4185e JB |
509 | tx->local->long_retry_limit; |
510 | } else { | |
e039fa4a | 511 | info->control.retry_limit = |
58d4185e JB |
512 | tx->local->short_retry_limit; |
513 | } | |
e2ebc74d | 514 | } else { |
e039fa4a | 515 | info->control.retry_limit = 1; |
e2ebc74d | 516 | } |
e2ebc74d JB |
517 | } |
518 | ||
5cf121c3 | 519 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
520 | /* Do not use multiple retry rates when sending fragmented |
521 | * frames. | |
522 | * TODO: The last fragment could still use multiple retry | |
523 | * rates. */ | |
e039fa4a | 524 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
525 | } |
526 | ||
527 | /* Use CTS protection for unicast frames sent using extended rates if | |
528 | * there are associated non-ERP stations and RTS/CTS is not configured | |
529 | * for the frame. */ | |
8318d78a | 530 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
2e92e6f2 | 531 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) && |
5cf121c3 | 532 | (tx->flags & IEEE80211_TX_UNICAST) && |
471b3efd | 533 | tx->sdata->bss_conf.use_cts_prot && |
e039fa4a JB |
534 | !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)) |
535 | info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT; | |
e2ebc74d | 536 | |
7e9ed188 DD |
537 | /* Transmit data frames using short preambles if the driver supports |
538 | * short preambles at the selected rate and short preambles are | |
539 | * available on the network at the current point in time. */ | |
065e9605 | 540 | if (ieee80211_is_data(hdr->frame_control) && |
2e92e6f2 | 541 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 542 | tx->sdata->bss_conf.use_short_preamble && |
07346f81 | 543 | (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) { |
e039fa4a | 544 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; |
7e9ed188 DD |
545 | } |
546 | ||
e039fa4a JB |
547 | if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) || |
548 | (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) { | |
2e92e6f2 JB |
549 | struct ieee80211_rate *rate; |
550 | s8 baserate = -1; | |
8318d78a JB |
551 | int idx; |
552 | ||
e2ebc74d | 553 | /* Do not use multiple retry rates when using RTS/CTS */ |
e039fa4a | 554 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
555 | |
556 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
2e92e6f2 | 557 | rate = &sband->bitrates[tx->rate_idx]; |
8318d78a JB |
558 | |
559 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
560 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
561 | continue; | |
96dd22ac | 562 | if (tx->sdata->bss_conf.basic_rates & BIT(idx) && |
2e92e6f2 JB |
563 | (baserate < 0 || |
564 | (sband->bitrates[baserate].bitrate | |
565 | < sband->bitrates[idx].bitrate))) | |
566 | baserate = idx; | |
8318d78a | 567 | } |
e2ebc74d | 568 | |
2e92e6f2 | 569 | if (baserate >= 0) |
e039fa4a | 570 | info->control.rts_cts_rate_idx = baserate; |
8318d78a | 571 | else |
e039fa4a | 572 | info->control.rts_cts_rate_idx = 0; |
e2ebc74d JB |
573 | } |
574 | ||
e2454948 | 575 | if (tx->sta) |
17741cdc | 576 | info->control.sta = &tx->sta->sta; |
e2454948 JB |
577 | |
578 | return TX_CONTINUE; | |
579 | } | |
580 | ||
f591fa5d JB |
581 | static ieee80211_tx_result debug_noinline |
582 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
583 | { | |
584 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
585 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
586 | u16 *seq; | |
587 | u8 *qc; | |
588 | int tid; | |
589 | ||
25d834e1 JB |
590 | /* |
591 | * Packet injection may want to control the sequence | |
592 | * number, if we have no matching interface then we | |
593 | * neither assign one ourselves nor ask the driver to. | |
594 | */ | |
595 | if (unlikely(!info->control.vif)) | |
596 | return TX_CONTINUE; | |
597 | ||
f591fa5d JB |
598 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
599 | return TX_CONTINUE; | |
600 | ||
601 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
602 | return TX_CONTINUE; | |
603 | ||
604 | if (!ieee80211_is_data_qos(hdr->frame_control)) { | |
605 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
606 | return TX_CONTINUE; | |
607 | } | |
608 | ||
609 | /* | |
610 | * This should be true for injected/management frames only, for | |
611 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
612 | * above since they are not QoS-data frames. | |
613 | */ | |
614 | if (!tx->sta) | |
615 | return TX_CONTINUE; | |
616 | ||
617 | /* include per-STA, per-TID sequence counter */ | |
618 | ||
619 | qc = ieee80211_get_qos_ctl(hdr); | |
620 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
621 | seq = &tx->sta->tid_seq[tid]; | |
622 | ||
623 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
624 | ||
625 | /* Increase the sequence number. */ | |
626 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
627 | ||
628 | return TX_CONTINUE; | |
629 | } | |
630 | ||
d9e8a70f | 631 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
632 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
633 | { | |
065e9605 | 634 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2454948 JB |
635 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; |
636 | struct sk_buff **frags, *first, *frag; | |
637 | int i; | |
638 | u16 seq; | |
639 | u8 *pos; | |
640 | int frag_threshold = tx->local->fragmentation_threshold; | |
641 | ||
642 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
643 | return TX_CONTINUE; | |
644 | ||
eefce91a JB |
645 | /* |
646 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
647 | * This scenario is handled in __ieee80211_tx_prepare but extra |
648 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a JB |
649 | */ |
650 | if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU || | |
e2530083 JB |
651 | skb_get_queue_mapping(tx->skb) >= |
652 | ieee80211_num_regular_queues(&tx->local->hw))) | |
eefce91a JB |
653 | return TX_DROP; |
654 | ||
e2454948 JB |
655 | first = tx->skb; |
656 | ||
065e9605 | 657 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 JB |
658 | payload_len = first->len - hdrlen; |
659 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
660 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
661 | ||
662 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
663 | if (!frags) | |
664 | goto fail; | |
665 | ||
666 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
667 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
668 | pos = first->data + hdrlen + per_fragm; | |
669 | left = payload_len - per_fragm; | |
670 | for (i = 0; i < num_fragm - 1; i++) { | |
671 | struct ieee80211_hdr *fhdr; | |
672 | size_t copylen; | |
673 | ||
674 | if (left <= 0) | |
675 | goto fail; | |
676 | ||
677 | /* reserve enough extra head and tail room for possible | |
678 | * encryption */ | |
679 | frag = frags[i] = | |
680 | dev_alloc_skb(tx->local->tx_headroom + | |
681 | frag_threshold + | |
682 | IEEE80211_ENCRYPT_HEADROOM + | |
683 | IEEE80211_ENCRYPT_TAILROOM); | |
684 | if (!frag) | |
685 | goto fail; | |
686 | /* Make sure that all fragments use the same priority so | |
687 | * that they end up using the same TX queue */ | |
688 | frag->priority = first->priority; | |
689 | skb_reserve(frag, tx->local->tx_headroom + | |
690 | IEEE80211_ENCRYPT_HEADROOM); | |
691 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
692 | memcpy(fhdr, first->data, hdrlen); | |
693 | if (i == num_fragm - 2) | |
694 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
695 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
696 | copylen = left > per_fragm ? per_fragm : left; | |
697 | memcpy(skb_put(frag, copylen), pos, copylen); | |
03f93c3d JB |
698 | memcpy(frag->cb, first->cb, sizeof(frag->cb)); |
699 | skb_copy_queue_mapping(frag, first); | |
d0f09804 | 700 | frag->do_not_encrypt = first->do_not_encrypt; |
e2454948 JB |
701 | |
702 | pos += copylen; | |
703 | left -= copylen; | |
e2ebc74d | 704 | } |
e2454948 JB |
705 | skb_trim(first, hdrlen + per_fragm); |
706 | ||
707 | tx->num_extra_frag = num_fragm - 1; | |
708 | tx->extra_frag = frags; | |
e2ebc74d | 709 | |
9ae54c84 | 710 | return TX_CONTINUE; |
e2454948 JB |
711 | |
712 | fail: | |
e2454948 JB |
713 | if (frags) { |
714 | for (i = 0; i < num_fragm - 1; i++) | |
715 | if (frags[i]) | |
716 | dev_kfree_skb(frags[i]); | |
717 | kfree(frags); | |
718 | } | |
719 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
720 | return TX_DROP; | |
e2ebc74d JB |
721 | } |
722 | ||
d9e8a70f | 723 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
724 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
725 | { | |
726 | if (!tx->key) | |
727 | return TX_CONTINUE; | |
728 | ||
729 | switch (tx->key->conf.alg) { | |
730 | case ALG_WEP: | |
731 | return ieee80211_crypto_wep_encrypt(tx); | |
732 | case ALG_TKIP: | |
733 | return ieee80211_crypto_tkip_encrypt(tx); | |
734 | case ALG_CCMP: | |
735 | return ieee80211_crypto_ccmp_encrypt(tx); | |
736 | } | |
737 | ||
738 | /* not reached */ | |
739 | WARN_ON(1); | |
740 | return TX_DROP; | |
741 | } | |
742 | ||
d9e8a70f | 743 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
744 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
745 | { | |
746 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
747 | int next_len, i; | |
748 | int group_addr = is_multicast_ether_addr(hdr->addr1); | |
749 | ||
750 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) { | |
751 | hdr->duration_id = ieee80211_duration(tx, group_addr, 0); | |
752 | return TX_CONTINUE; | |
753 | } | |
754 | ||
755 | hdr->duration_id = ieee80211_duration(tx, group_addr, | |
756 | tx->extra_frag[0]->len); | |
757 | ||
758 | for (i = 0; i < tx->num_extra_frag; i++) { | |
759 | if (i + 1 < tx->num_extra_frag) { | |
760 | next_len = tx->extra_frag[i + 1]->len; | |
761 | } else { | |
762 | next_len = 0; | |
763 | tx->rate_idx = tx->last_frag_rate_idx; | |
764 | } | |
765 | ||
766 | hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data; | |
767 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); | |
768 | } | |
769 | ||
770 | return TX_CONTINUE; | |
771 | } | |
772 | ||
d9e8a70f | 773 | static ieee80211_tx_result debug_noinline |
e2454948 | 774 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 775 | { |
9e72ebd6 | 776 | int i; |
e2ebc74d | 777 | |
9e72ebd6 JB |
778 | if (!tx->sta) |
779 | return TX_CONTINUE; | |
e2ebc74d | 780 | |
9e72ebd6 JB |
781 | tx->sta->tx_packets++; |
782 | tx->sta->tx_fragments++; | |
783 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 784 | if (tx->extra_frag) { |
9e72ebd6 JB |
785 | tx->sta->tx_fragments += tx->num_extra_frag; |
786 | for (i = 0; i < tx->num_extra_frag; i++) | |
787 | tx->sta->tx_bytes += tx->extra_frag[i]->len; | |
e2454948 JB |
788 | } |
789 | ||
9ae54c84 | 790 | return TX_CONTINUE; |
e2ebc74d JB |
791 | } |
792 | ||
e2ebc74d | 793 | |
e2ebc74d JB |
794 | /* actual transmit path */ |
795 | ||
796 | /* | |
797 | * deal with packet injection down monitor interface | |
798 | * with Radiotap Header -- only called for monitor mode interface | |
799 | */ | |
9ae54c84 | 800 | static ieee80211_tx_result |
5cf121c3 | 801 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 802 | struct sk_buff *skb) |
e2ebc74d JB |
803 | { |
804 | /* | |
805 | * this is the moment to interpret and discard the radiotap header that | |
806 | * must be at the start of the packet injected in Monitor mode | |
807 | * | |
808 | * Need to take some care with endian-ness since radiotap | |
809 | * args are little-endian | |
810 | */ | |
811 | ||
812 | struct ieee80211_radiotap_iterator iterator; | |
813 | struct ieee80211_radiotap_header *rthdr = | |
814 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 815 | struct ieee80211_supported_band *sband; |
e2ebc74d | 816 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
e039fa4a | 817 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 818 | |
2e92e6f2 | 819 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 820 | |
d0f09804 | 821 | skb->do_not_encrypt = 1; |
5cf121c3 | 822 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
823 | |
824 | /* | |
825 | * for every radiotap entry that is present | |
826 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
827 | * entries present, or -EINVAL on error) | |
828 | */ | |
829 | ||
830 | while (!ret) { | |
831 | int i, target_rate; | |
832 | ||
833 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
834 | ||
835 | if (ret) | |
836 | continue; | |
837 | ||
838 | /* see if this argument is something we can use */ | |
839 | switch (iterator.this_arg_index) { | |
840 | /* | |
841 | * You must take care when dereferencing iterator.this_arg | |
842 | * for multibyte types... the pointer is not aligned. Use | |
843 | * get_unaligned((type *)iterator.this_arg) to dereference | |
844 | * iterator.this_arg for type "type" safely on all arches. | |
845 | */ | |
846 | case IEEE80211_RADIOTAP_RATE: | |
847 | /* | |
848 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
849 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
850 | */ | |
851 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
852 | for (i = 0; i < sband->n_bitrates; i++) { |
853 | struct ieee80211_rate *r; | |
e2ebc74d | 854 | |
8318d78a JB |
855 | r = &sband->bitrates[i]; |
856 | ||
857 | if (r->bitrate == target_rate) { | |
2e92e6f2 | 858 | tx->rate_idx = i; |
58d4185e JB |
859 | break; |
860 | } | |
e2ebc74d JB |
861 | } |
862 | break; | |
863 | ||
864 | case IEEE80211_RADIOTAP_ANTENNA: | |
865 | /* | |
866 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
867 | * 1st ant | |
868 | */ | |
e039fa4a | 869 | info->antenna_sel_tx = (*iterator.this_arg) + 1; |
e2ebc74d JB |
870 | break; |
871 | ||
8318d78a | 872 | #if 0 |
e2ebc74d JB |
873 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
874 | control->power_level = *iterator.this_arg; | |
875 | break; | |
8318d78a | 876 | #endif |
e2ebc74d JB |
877 | |
878 | case IEEE80211_RADIOTAP_FLAGS: | |
879 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
880 | /* | |
881 | * this indicates that the skb we have been | |
882 | * handed has the 32-bit FCS CRC at the end... | |
883 | * we should react to that by snipping it off | |
884 | * because it will be recomputed and added | |
885 | * on transmission | |
886 | */ | |
887 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 888 | return TX_DROP; |
e2ebc74d JB |
889 | |
890 | skb_trim(skb, skb->len - FCS_LEN); | |
891 | } | |
58d4185e | 892 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 893 | tx->skb->do_not_encrypt = 0; |
58d4185e | 894 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 895 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
896 | break; |
897 | ||
58d4185e JB |
898 | /* |
899 | * Please update the file | |
900 | * Documentation/networking/mac80211-injection.txt | |
901 | * when parsing new fields here. | |
902 | */ | |
903 | ||
e2ebc74d JB |
904 | default: |
905 | break; | |
906 | } | |
907 | } | |
908 | ||
909 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 910 | return TX_DROP; |
e2ebc74d JB |
911 | |
912 | /* | |
913 | * remove the radiotap header | |
914 | * iterator->max_length was sanity-checked against | |
915 | * skb->len by iterator init | |
916 | */ | |
917 | skb_pull(skb, iterator.max_length); | |
918 | ||
9ae54c84 | 919 | return TX_CONTINUE; |
e2ebc74d JB |
920 | } |
921 | ||
58d4185e JB |
922 | /* |
923 | * initialises @tx | |
924 | */ | |
9ae54c84 | 925 | static ieee80211_tx_result |
5cf121c3 | 926 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 927 | struct sk_buff *skb, |
e039fa4a | 928 | struct net_device *dev) |
e2ebc74d JB |
929 | { |
930 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 931 | struct ieee80211_hdr *hdr; |
e2ebc74d | 932 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 933 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
934 | |
935 | int hdrlen; | |
936 | ||
937 | memset(tx, 0, sizeof(*tx)); | |
938 | tx->skb = skb; | |
939 | tx->dev = dev; /* use original interface */ | |
940 | tx->local = local; | |
941 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 942 | tx->channel = local->hw.conf.channel; |
5854a32e JB |
943 | tx->rate_idx = -1; |
944 | tx->last_frag_rate_idx = -1; | |
e2ebc74d | 945 | /* |
58d4185e JB |
946 | * Set this flag (used below to indicate "automatic fragmentation"), |
947 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 948 | */ |
5cf121c3 | 949 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
950 | |
951 | /* process and remove the injection radiotap header */ | |
952 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
25d834e1 | 953 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
9ae54c84 JB |
954 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
955 | return TX_DROP; | |
58d4185e | 956 | |
e2ebc74d | 957 | /* |
58d4185e JB |
958 | * __ieee80211_parse_tx_radiotap has now removed |
959 | * the radiotap header that was present and pre-filled | |
960 | * 'tx' with tx control information. | |
e2ebc74d | 961 | */ |
e2ebc74d JB |
962 | } |
963 | ||
58d4185e JB |
964 | hdr = (struct ieee80211_hdr *) skb->data; |
965 | ||
24338793 | 966 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 967 | |
badffb72 | 968 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 969 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 970 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 971 | } else { |
5cf121c3 | 972 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 973 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 974 | } |
58d4185e | 975 | |
5cf121c3 JB |
976 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
977 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 978 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 RR |
979 | !local->ops->set_frag_threshold && |
980 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) | |
5cf121c3 | 981 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 982 | else |
5cf121c3 | 983 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
984 | } |
985 | ||
e2ebc74d | 986 | if (!tx->sta) |
e039fa4a | 987 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 988 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 989 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 990 | |
b73d70ad | 991 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
992 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
993 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
994 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
995 | } | |
e039fa4a | 996 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 997 | |
9ae54c84 | 998 | return TX_CONTINUE; |
e2ebc74d JB |
999 | } |
1000 | ||
32bfd35d | 1001 | /* |
58d4185e JB |
1002 | * NB: @tx is uninitialised when passed in here |
1003 | */ | |
5cf121c3 | 1004 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e | 1005 | struct sk_buff *skb, |
e039fa4a | 1006 | struct net_device *mdev) |
e2ebc74d | 1007 | { |
e2ebc74d JB |
1008 | struct net_device *dev; |
1009 | ||
d0f09804 | 1010 | dev = dev_get_by_index(&init_net, skb->iif); |
e2ebc74d JB |
1011 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1012 | dev_put(dev); | |
1013 | dev = NULL; | |
1014 | } | |
1015 | if (unlikely(!dev)) | |
1016 | return -ENODEV; | |
58d4185e | 1017 | /* initialises tx with control */ |
e039fa4a | 1018 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1019 | dev_put(dev); |
e2ebc74d JB |
1020 | return 0; |
1021 | } | |
1022 | ||
1023 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1024 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1025 | { |
f8e79ddd | 1026 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1027 | int ret, i; |
1028 | ||
e2ebc74d | 1029 | if (skb) { |
f8e79ddd TW |
1030 | if (netif_subqueue_stopped(local->mdev, skb)) |
1031 | return IEEE80211_TX_AGAIN; | |
1032 | info = IEEE80211_SKB_CB(skb); | |
1033 | ||
e039fa4a | 1034 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1035 | if (ret) |
1036 | return IEEE80211_TX_AGAIN; | |
1037 | local->mdev->trans_start = jiffies; | |
1038 | ieee80211_led_tx(local, 1); | |
1039 | } | |
5cf121c3 | 1040 | if (tx->extra_frag) { |
5cf121c3 JB |
1041 | for (i = 0; i < tx->num_extra_frag; i++) { |
1042 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1043 | continue; |
e039fa4a JB |
1044 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
1045 | info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS | | |
1046 | IEEE80211_TX_CTL_USE_CTS_PROTECT | | |
1047 | IEEE80211_TX_CTL_CLEAR_PS_FILT | | |
1048 | IEEE80211_TX_CTL_FIRST_FRAGMENT); | |
e2530083 JB |
1049 | if (netif_subqueue_stopped(local->mdev, |
1050 | tx->extra_frag[i])) | |
e2ebc74d | 1051 | return IEEE80211_TX_FRAG_AGAIN; |
5cf121c3 | 1052 | if (i == tx->num_extra_frag) { |
e039fa4a | 1053 | info->tx_rate_idx = tx->last_frag_rate_idx; |
8318d78a | 1054 | |
5cf121c3 | 1055 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e039fa4a JB |
1056 | info->flags |= |
1057 | IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 1058 | else |
e039fa4a JB |
1059 | info->flags &= |
1060 | ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d JB |
1061 | } |
1062 | ||
e2ebc74d | 1063 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1064 | tx->extra_frag[i]); |
e2ebc74d JB |
1065 | if (ret) |
1066 | return IEEE80211_TX_FRAG_AGAIN; | |
1067 | local->mdev->trans_start = jiffies; | |
1068 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1069 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1070 | } |
5cf121c3 JB |
1071 | kfree(tx->extra_frag); |
1072 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1073 | } |
1074 | return IEEE80211_TX_OK; | |
1075 | } | |
1076 | ||
97b045d6 JB |
1077 | /* |
1078 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1079 | * frame was dropped or queued. | |
1080 | */ | |
1081 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1082 | { | |
97b045d6 | 1083 | struct sk_buff *skb = tx->skb; |
97b045d6 JB |
1084 | ieee80211_tx_result res = TX_DROP; |
1085 | int i; | |
1086 | ||
d9e8a70f JB |
1087 | #define CALL_TXH(txh) \ |
1088 | res = txh(tx); \ | |
1089 | if (res != TX_CONTINUE) \ | |
1090 | goto txh_done; | |
1091 | ||
1092 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1093 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1094 | CALL_TXH(ieee80211_tx_h_select_key) | |
1095 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1096 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1097 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1098 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1099 | CALL_TXH(ieee80211_tx_h_fragment) |
1100 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1101 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1102 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1103 | CALL_TXH(ieee80211_tx_h_stats) | |
1104 | #undef CALL_TXH | |
97b045d6 | 1105 | |
d9e8a70f | 1106 | txh_done: |
97b045d6 | 1107 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1108 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
97b045d6 JB |
1109 | dev_kfree_skb(skb); |
1110 | for (i = 0; i < tx->num_extra_frag; i++) | |
1111 | if (tx->extra_frag[i]) | |
1112 | dev_kfree_skb(tx->extra_frag[i]); | |
1113 | kfree(tx->extra_frag); | |
1114 | return -1; | |
1115 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1116 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1117 | return -1; |
1118 | } | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
e039fa4a | 1123 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1124 | { |
1125 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1126 | struct sta_info *sta; | |
5cf121c3 | 1127 | struct ieee80211_tx_data tx; |
97b045d6 | 1128 | ieee80211_tx_result res_prepare; |
e039fa4a | 1129 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1130 | int ret, i; |
e2530083 | 1131 | u16 queue; |
e2ebc74d | 1132 | |
e2530083 JB |
1133 | queue = skb_get_queue_mapping(skb); |
1134 | ||
1135 | WARN_ON(test_bit(queue, local->queues_pending)); | |
e2ebc74d JB |
1136 | |
1137 | if (unlikely(skb->len < 10)) { | |
1138 | dev_kfree_skb(skb); | |
1139 | return 0; | |
1140 | } | |
1141 | ||
d0709a65 JB |
1142 | rcu_read_lock(); |
1143 | ||
58d4185e | 1144 | /* initialises tx */ |
e039fa4a | 1145 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1146 | |
9ae54c84 | 1147 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1148 | dev_kfree_skb(skb); |
d0709a65 | 1149 | rcu_read_unlock(); |
e2ebc74d JB |
1150 | return 0; |
1151 | } | |
1152 | ||
1153 | sta = tx.sta; | |
5cf121c3 | 1154 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1155 | info->band = tx.channel->band; |
e2ebc74d | 1156 | |
97b045d6 JB |
1157 | if (invoke_tx_handlers(&tx)) |
1158 | goto out; | |
e2ebc74d | 1159 | |
e2ebc74d JB |
1160 | retry: |
1161 | ret = __ieee80211_tx(local, skb, &tx); | |
1162 | if (ret) { | |
eefce91a JB |
1163 | struct ieee80211_tx_stored_packet *store; |
1164 | ||
1165 | /* | |
1166 | * Since there are no fragmented frames on A-MPDU | |
1167 | * queues, there's no reason for a driver to reject | |
1168 | * a frame there, warn and drop it. | |
1169 | */ | |
e2530083 | 1170 | if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw))) |
eefce91a JB |
1171 | goto drop; |
1172 | ||
1173 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1174 | |
1175 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1176 | skb = NULL; | |
f8e79ddd | 1177 | |
e2530083 | 1178 | set_bit(queue, local->queues_pending); |
e2ebc74d | 1179 | smp_mb(); |
e2530083 JB |
1180 | /* |
1181 | * When the driver gets out of buffers during sending of | |
1182 | * fragments and calls ieee80211_stop_queue, the netif | |
1183 | * subqueue is stopped. There is, however, a small window | |
1184 | * in which the PENDING bit is not yet set. If a buffer | |
e2ebc74d JB |
1185 | * gets available in that window (i.e. driver calls |
1186 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
e2530083 | 1187 | * called with the PENDING bit still set. Prevent this by |
e2ebc74d | 1188 | * continuing transmitting here when that situation is |
e2530083 JB |
1189 | * possible to have happened. |
1190 | */ | |
1191 | if (!__netif_subqueue_stopped(local->mdev, queue)) { | |
1192 | clear_bit(queue, local->queues_pending); | |
e2ebc74d JB |
1193 | goto retry; |
1194 | } | |
e2ebc74d | 1195 | store->skb = skb; |
5cf121c3 JB |
1196 | store->extra_frag = tx.extra_frag; |
1197 | store->num_extra_frag = tx.num_extra_frag; | |
2e92e6f2 | 1198 | store->last_frag_rate_idx = tx.last_frag_rate_idx; |
badffb72 | 1199 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1200 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1201 | } |
97b045d6 | 1202 | out: |
d4e46a3d | 1203 | rcu_read_unlock(); |
e2ebc74d JB |
1204 | return 0; |
1205 | ||
1206 | drop: | |
1207 | if (skb) | |
1208 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1209 | for (i = 0; i < tx.num_extra_frag; i++) |
1210 | if (tx.extra_frag[i]) | |
1211 | dev_kfree_skb(tx.extra_frag[i]); | |
1212 | kfree(tx.extra_frag); | |
d4e46a3d | 1213 | rcu_read_unlock(); |
e2ebc74d JB |
1214 | return 0; |
1215 | } | |
1216 | ||
1217 | /* device xmit handlers */ | |
1218 | ||
23c0752a JB |
1219 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1220 | struct sk_buff *skb, | |
1221 | int head_need, bool may_encrypt) | |
1222 | { | |
1223 | int tail_need = 0; | |
1224 | ||
1225 | /* | |
1226 | * This could be optimised, devices that do full hardware | |
1227 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1228 | * have no drivers for such devices currently. | |
1229 | */ | |
1230 | if (may_encrypt) { | |
1231 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1232 | tail_need -= skb_tailroom(skb); | |
1233 | tail_need = max_t(int, tail_need, 0); | |
1234 | } | |
1235 | ||
1236 | if (head_need || tail_need) { | |
1237 | /* Sorry. Can't account for this any more */ | |
1238 | skb_orphan(skb); | |
1239 | } | |
1240 | ||
1241 | if (skb_header_cloned(skb)) | |
1242 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1243 | else | |
1244 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1245 | ||
1246 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1247 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1248 | wiphy_name(local->hw.wiphy)); | |
1249 | return -ENOMEM; | |
1250 | } | |
1251 | ||
1252 | /* update truesize too */ | |
1253 | skb->truesize += head_need + tail_need; | |
1254 | ||
1255 | return 0; | |
1256 | } | |
1257 | ||
e2ebc74d JB |
1258 | int ieee80211_master_start_xmit(struct sk_buff *skb, |
1259 | struct net_device *dev) | |
1260 | { | |
e039fa4a | 1261 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1262 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1263 | struct net_device *odev = NULL; |
1264 | struct ieee80211_sub_if_data *osdata; | |
1265 | int headroom; | |
23c0752a | 1266 | bool may_encrypt; |
25d834e1 JB |
1267 | enum { |
1268 | NOT_MONITOR, | |
1269 | FOUND_SDATA, | |
1270 | UNKNOWN_ADDRESS, | |
1271 | } monitor_iface = NOT_MONITOR; | |
e2ebc74d JB |
1272 | int ret; |
1273 | ||
d0f09804 JB |
1274 | if (skb->iif) |
1275 | odev = dev_get_by_index(&init_net, skb->iif); | |
e2ebc74d JB |
1276 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1277 | dev_put(odev); | |
1278 | odev = NULL; | |
1279 | } | |
1280 | if (unlikely(!odev)) { | |
1281 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1282 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1283 | "originating device\n", dev->name); | |
1284 | #endif | |
1285 | dev_kfree_skb(skb); | |
1286 | return 0; | |
1287 | } | |
e039fa4a | 1288 | |
d0f09804 JB |
1289 | memset(info, 0, sizeof(*info)); |
1290 | ||
1291 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1292 | ||
e2ebc74d JB |
1293 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1294 | ||
e32f85f7 LCC |
1295 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1296 | ieee80211_is_data(hdr->frame_control)) { | |
1297 | if (ieee80211_is_data(hdr->frame_control)) { | |
1298 | if (is_multicast_ether_addr(hdr->addr3)) | |
1299 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1300 | else | |
f698d856 | 1301 | if (mesh_nexthop_lookup(skb, osdata)) |
e32f85f7 LCC |
1302 | return 0; |
1303 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) | |
472dbc45 | 1304 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh, |
e32f85f7 LCC |
1305 | fwded_frames); |
1306 | } | |
25d834e1 JB |
1307 | } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
1308 | struct ieee80211_sub_if_data *sdata; | |
1309 | struct ieee80211_local *local = osdata->local; | |
1310 | struct ieee80211_hdr *hdr; | |
1311 | int hdrlen; | |
1312 | u16 len_rthdr; | |
1313 | ||
1314 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
1315 | monitor_iface = UNKNOWN_ADDRESS; | |
1316 | ||
1317 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1318 | hdr = (struct ieee80211_hdr *)skb->data + len_rthdr; | |
1319 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1320 | ||
1321 | /* check the header is complete in the frame */ | |
1322 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1323 | /* | |
1324 | * We process outgoing injected frames that have a | |
1325 | * local address we handle as though they are our | |
1326 | * own frames. | |
1327 | * This code here isn't entirely correct, the local | |
1328 | * MAC address is not necessarily enough to find | |
1329 | * the interface to use; for that proper VLAN/WDS | |
1330 | * support we will need a different mechanism. | |
1331 | */ | |
1332 | ||
1333 | rcu_read_lock(); | |
1334 | list_for_each_entry_rcu(sdata, &local->interfaces, | |
1335 | list) { | |
1336 | if (!netif_running(sdata->dev)) | |
1337 | continue; | |
1338 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1339 | hdr->addr2)) { | |
1340 | dev_hold(sdata->dev); | |
1341 | dev_put(odev); | |
1342 | osdata = sdata; | |
1343 | odev = osdata->dev; | |
1344 | skb->iif = sdata->dev->ifindex; | |
1345 | monitor_iface = FOUND_SDATA; | |
1346 | break; | |
1347 | } | |
1348 | } | |
1349 | rcu_read_unlock(); | |
1350 | } | |
e32f85f7 LCC |
1351 | } |
1352 | ||
d0f09804 | 1353 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1354 | |
1355 | headroom = osdata->local->tx_headroom; | |
1356 | if (may_encrypt) | |
1357 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1358 | headroom -= skb_headroom(skb); | |
1359 | headroom = max_t(int, 0, headroom); | |
1360 | ||
1361 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1362 | dev_kfree_skb(skb); | |
1363 | dev_put(odev); | |
1364 | return 0; | |
e2ebc74d JB |
1365 | } |
1366 | ||
30613070 JB |
1367 | if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
1368 | osdata = container_of(osdata->bss, | |
1369 | struct ieee80211_sub_if_data, | |
1370 | u.ap); | |
25d834e1 JB |
1371 | if (likely(monitor_iface != UNKNOWN_ADDRESS)) |
1372 | info->control.vif = &osdata->vif; | |
e039fa4a | 1373 | ret = ieee80211_tx(odev, skb); |
e2ebc74d JB |
1374 | dev_put(odev); |
1375 | ||
1376 | return ret; | |
1377 | } | |
1378 | ||
1379 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1380 | struct net_device *dev) | |
1381 | { | |
1382 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1383 | struct ieee80211_radiotap_header *prthdr = |
1384 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1385 | u16 len_rthdr; |
e2ebc74d | 1386 | |
9b8a74e3 AG |
1387 | /* check for not even having the fixed radiotap header part */ |
1388 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1389 | goto fail; /* too short to be possibly valid */ | |
1390 | ||
1391 | /* is it a header version we can trust to find length from? */ | |
1392 | if (unlikely(prthdr->it_version)) | |
1393 | goto fail; /* only version 0 is supported */ | |
1394 | ||
1395 | /* then there must be a radiotap header with a length we can use */ | |
1396 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1397 | ||
1398 | /* does the skb contain enough to deliver on the alleged length? */ | |
1399 | if (unlikely(skb->len < len_rthdr)) | |
1400 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1401 | |
1402 | skb->dev = local->mdev; | |
1403 | ||
9b8a74e3 | 1404 | /* needed because we set skb device to master */ |
d0f09804 | 1405 | skb->iif = dev->ifindex; |
9b8a74e3 | 1406 | |
d0f09804 JB |
1407 | /* sometimes we do encrypt injected frames, will be fixed |
1408 | * up in radiotap parser if not wanted */ | |
1409 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1410 | |
e2ebc74d JB |
1411 | /* |
1412 | * fix up the pointers accounting for the radiotap | |
1413 | * header still being in there. We are being given | |
1414 | * a precooked IEEE80211 header so no need for | |
1415 | * normal processing | |
1416 | */ | |
9b8a74e3 | 1417 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1418 | /* |
9b8a74e3 AG |
1419 | * these are just fixed to the end of the rt area since we |
1420 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1421 | */ |
9b8a74e3 AG |
1422 | skb_set_network_header(skb, len_rthdr); |
1423 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1424 | |
9b8a74e3 AG |
1425 | /* pass the radiotap header up to the next stage intact */ |
1426 | dev_queue_xmit(skb); | |
e2ebc74d | 1427 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1428 | |
1429 | fail: | |
1430 | dev_kfree_skb(skb); | |
1431 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1432 | } |
1433 | ||
1434 | /** | |
1435 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1436 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1437 | * @skb: packet to be sent | |
1438 | * @dev: incoming interface | |
1439 | * | |
1440 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1441 | * not be freed, and caller is responsible for either retrying later or freeing | |
1442 | * skb). | |
1443 | * | |
1444 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1445 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1446 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1447 | * transmission (through low-level driver). | |
1448 | */ | |
1449 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1450 | struct net_device *dev) | |
1451 | { | |
1452 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1453 | struct ieee80211_sub_if_data *sdata; |
1454 | int ret = 1, head_need; | |
065e9605 HH |
1455 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1456 | __le16 fc; | |
e2ebc74d | 1457 | struct ieee80211_hdr hdr; |
33b64eb2 | 1458 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1459 | const u8 *encaps_data; |
1460 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1461 | int nh_pos, h_pos; |
e2ebc74d | 1462 | struct sta_info *sta; |
ce3edf6d | 1463 | u32 sta_flags = 0; |
e2ebc74d JB |
1464 | |
1465 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1466 | if (unlikely(skb->len < ETH_HLEN)) { | |
e2ebc74d JB |
1467 | ret = 0; |
1468 | goto fail; | |
1469 | } | |
1470 | ||
1471 | nh_pos = skb_network_header(skb) - skb->data; | |
1472 | h_pos = skb_transport_header(skb) - skb->data; | |
1473 | ||
1474 | /* convert Ethernet header to proper 802.11 header (based on | |
1475 | * operation mode) */ | |
1476 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1477 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1478 | |
51fb61e7 | 1479 | switch (sdata->vif.type) { |
05c914fe JB |
1480 | case NL80211_IFTYPE_AP: |
1481 | case NL80211_IFTYPE_AP_VLAN: | |
065e9605 | 1482 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1483 | /* DA BSSID SA */ |
1484 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1485 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1486 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1487 | hdrlen = 24; | |
cf966838 | 1488 | break; |
05c914fe | 1489 | case NL80211_IFTYPE_WDS: |
065e9605 | 1490 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1491 | /* RA TA DA SA */ |
1492 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1493 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1494 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1495 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1496 | hdrlen = 30; | |
cf966838 | 1497 | break; |
33b64eb2 | 1498 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1499 | case NL80211_IFTYPE_MESH_POINT: |
065e9605 | 1500 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
33b64eb2 | 1501 | /* RA TA DA SA */ |
e32f85f7 | 1502 | memset(hdr.addr1, 0, ETH_ALEN); |
33b64eb2 LCC |
1503 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); |
1504 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1505 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
472dbc45 | 1506 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1507 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1508 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
e32f85f7 LCC |
1509 | ret = 0; |
1510 | goto fail; | |
33b64eb2 | 1511 | } |
e32f85f7 | 1512 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); |
33b64eb2 LCC |
1513 | hdrlen = 30; |
1514 | break; | |
1515 | #endif | |
05c914fe | 1516 | case NL80211_IFTYPE_STATION: |
065e9605 | 1517 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1518 | /* BSSID SA DA */ |
1519 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1520 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1521 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1522 | hdrlen = 24; | |
cf966838 | 1523 | break; |
05c914fe | 1524 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1525 | /* DA SA BSSID */ |
1526 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1527 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1528 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1529 | hdrlen = 24; | |
cf966838 JB |
1530 | break; |
1531 | default: | |
e2ebc74d JB |
1532 | ret = 0; |
1533 | goto fail; | |
1534 | } | |
1535 | ||
7d185b8b JB |
1536 | /* |
1537 | * There's no need to try to look up the destination | |
1538 | * if it is a multicast address (which can only happen | |
1539 | * in AP mode) | |
1540 | */ | |
1541 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1542 | rcu_read_lock(); |
7d185b8b | 1543 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1544 | if (sta) |
07346f81 | 1545 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1546 | rcu_read_unlock(); |
e2ebc74d JB |
1547 | } |
1548 | ||
3434fbd3 | 1549 | /* receiver and we are QoS enabled, use a QoS type frame */ |
e2530083 JB |
1550 | if (sta_flags & WLAN_STA_WME && |
1551 | ieee80211_num_regular_queues(&local->hw) >= 4) { | |
065e9605 | 1552 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1553 | hdrlen += 2; |
1554 | } | |
1555 | ||
1556 | /* | |
238814fd JB |
1557 | * Drop unicast frames to unauthorised stations unless they are |
1558 | * EAPOL frames from the local station. | |
ce3edf6d | 1559 | */ |
e32f85f7 LCC |
1560 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1561 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1562 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1563 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1564 | compare_ether_addr(dev->dev_addr, |
1565 | skb->data + ETH_ALEN) == 0))) { | |
1566 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1567 | DECLARE_MAC_BUF(mac); | |
1568 | ||
1569 | if (net_ratelimit()) | |
1570 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1571 | " (unauthorized port)\n", dev->name, | |
1572 | print_mac(mac, hdr.addr1)); | |
1573 | #endif | |
1574 | ||
1575 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1576 | ||
1577 | ret = 0; | |
1578 | goto fail; | |
1579 | } | |
1580 | ||
065e9605 | 1581 | hdr.frame_control = fc; |
e2ebc74d JB |
1582 | hdr.duration_id = 0; |
1583 | hdr.seq_ctrl = 0; | |
1584 | ||
1585 | skip_header_bytes = ETH_HLEN; | |
1586 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1587 | encaps_data = bridge_tunnel_header; | |
1588 | encaps_len = sizeof(bridge_tunnel_header); | |
1589 | skip_header_bytes -= 2; | |
1590 | } else if (ethertype >= 0x600) { | |
1591 | encaps_data = rfc1042_header; | |
1592 | encaps_len = sizeof(rfc1042_header); | |
1593 | skip_header_bytes -= 2; | |
1594 | } else { | |
1595 | encaps_data = NULL; | |
1596 | encaps_len = 0; | |
1597 | } | |
1598 | ||
1599 | skb_pull(skb, skip_header_bytes); | |
1600 | nh_pos -= skip_header_bytes; | |
1601 | h_pos -= skip_header_bytes; | |
1602 | ||
23c0752a | 1603 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1604 | |
23c0752a JB |
1605 | /* |
1606 | * So we need to modify the skb header and hence need a copy of | |
1607 | * that. The head_need variable above doesn't, so far, include | |
1608 | * the needed header space that we don't need right away. If we | |
1609 | * can, then we don't reallocate right now but only after the | |
1610 | * frame arrives at the master device (if it does...) | |
1611 | * | |
1612 | * If we cannot, however, then we will reallocate to include all | |
1613 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1614 | * make it big enough for everything we may ever need. | |
1615 | */ | |
e2ebc74d | 1616 | |
3a5be7d4 | 1617 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1618 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1619 | head_need += local->tx_headroom; | |
1620 | head_need = max_t(int, 0, head_need); | |
1621 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1622 | goto fail; |
e2ebc74d JB |
1623 | } |
1624 | ||
1625 | if (encaps_data) { | |
1626 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1627 | nh_pos += encaps_len; | |
1628 | h_pos += encaps_len; | |
1629 | } | |
c29b9b9b | 1630 | |
33b64eb2 LCC |
1631 | if (meshhdrlen > 0) { |
1632 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1633 | nh_pos += meshhdrlen; | |
1634 | h_pos += meshhdrlen; | |
1635 | } | |
1636 | ||
065e9605 | 1637 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1638 | __le16 *qos_control; |
1639 | ||
1640 | qos_control = (__le16*) skb_push(skb, 2); | |
1641 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1642 | /* | |
1643 | * Maybe we could actually set some fields here, for now just | |
1644 | * initialise to zero to indicate no special operation. | |
1645 | */ | |
1646 | *qos_control = 0; | |
1647 | } else | |
1648 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1649 | ||
e2ebc74d JB |
1650 | nh_pos += hdrlen; |
1651 | h_pos += hdrlen; | |
1652 | ||
d0f09804 | 1653 | skb->iif = dev->ifindex; |
b0a67179 | 1654 | |
e2ebc74d | 1655 | skb->dev = local->mdev; |
68aae116 SH |
1656 | dev->stats.tx_packets++; |
1657 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1658 | |
1659 | /* Update skb pointers to various headers since this modified frame | |
1660 | * is going to go through Linux networking code that may potentially | |
1661 | * need things like pointer to IP header. */ | |
1662 | skb_set_mac_header(skb, 0); | |
1663 | skb_set_network_header(skb, nh_pos); | |
1664 | skb_set_transport_header(skb, h_pos); | |
1665 | ||
1666 | dev->trans_start = jiffies; | |
1667 | dev_queue_xmit(skb); | |
1668 | ||
1669 | return 0; | |
1670 | ||
1671 | fail: | |
1672 | if (!ret) | |
1673 | dev_kfree_skb(skb); | |
1674 | ||
1675 | return ret; | |
1676 | } | |
1677 | ||
e2ebc74d | 1678 | |
e2530083 JB |
1679 | /* |
1680 | * ieee80211_clear_tx_pending may not be called in a context where | |
1681 | * it is possible that it packets could come in again. | |
1682 | */ | |
e2ebc74d JB |
1683 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1684 | { | |
1685 | int i, j; | |
1686 | struct ieee80211_tx_stored_packet *store; | |
1687 | ||
e2530083 JB |
1688 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1689 | if (!test_bit(i, local->queues_pending)) | |
e2ebc74d JB |
1690 | continue; |
1691 | store = &local->pending_packet[i]; | |
1692 | kfree_skb(store->skb); | |
1693 | for (j = 0; j < store->num_extra_frag; j++) | |
1694 | kfree_skb(store->extra_frag[j]); | |
1695 | kfree(store->extra_frag); | |
e2530083 | 1696 | clear_bit(i, local->queues_pending); |
e2ebc74d JB |
1697 | } |
1698 | } | |
1699 | ||
e2530083 JB |
1700 | /* |
1701 | * Transmit all pending packets. Called from tasklet, locks master device | |
1702 | * TX lock so that no new packets can come in. | |
1703 | */ | |
e2ebc74d JB |
1704 | void ieee80211_tx_pending(unsigned long data) |
1705 | { | |
1706 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1707 | struct net_device *dev = local->mdev; | |
1708 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1709 | struct ieee80211_tx_data tx; |
e2530083 | 1710 | int i, ret; |
e2ebc74d JB |
1711 | |
1712 | netif_tx_lock_bh(dev); | |
e2530083 JB |
1713 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1714 | /* Check that this queue is ok */ | |
f8e79ddd TW |
1715 | if (__netif_subqueue_stopped(local->mdev, i) && |
1716 | !test_bit(i, local->queues_pending_run)) | |
e2ebc74d | 1717 | continue; |
e2530083 JB |
1718 | |
1719 | if (!test_bit(i, local->queues_pending)) { | |
f8e79ddd | 1720 | clear_bit(i, local->queues_pending_run); |
e2530083 | 1721 | ieee80211_wake_queue(&local->hw, i); |
e2ebc74d JB |
1722 | continue; |
1723 | } | |
e2530083 | 1724 | |
f8e79ddd TW |
1725 | clear_bit(i, local->queues_pending_run); |
1726 | netif_start_subqueue(local->mdev, i); | |
1727 | ||
e2ebc74d | 1728 | store = &local->pending_packet[i]; |
5cf121c3 JB |
1729 | tx.extra_frag = store->extra_frag; |
1730 | tx.num_extra_frag = store->num_extra_frag; | |
2e92e6f2 | 1731 | tx.last_frag_rate_idx = store->last_frag_rate_idx; |
badffb72 JS |
1732 | tx.flags = 0; |
1733 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1734 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1735 | ret = __ieee80211_tx(local, store->skb, &tx); |
1736 | if (ret) { | |
1737 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1738 | store->skb = NULL; | |
1739 | } else { | |
e2530083 JB |
1740 | clear_bit(i, local->queues_pending); |
1741 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1742 | } |
1743 | } | |
1744 | netif_tx_unlock_bh(dev); | |
e2ebc74d JB |
1745 | } |
1746 | ||
1747 | /* functions for drivers to get certain frames */ | |
1748 | ||
1749 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1750 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1751 | struct sk_buff *skb, |
1752 | struct beacon_data *beacon) | |
e2ebc74d JB |
1753 | { |
1754 | u8 *pos, *tim; | |
1755 | int aid0 = 0; | |
1756 | int i, have_bits = 0, n1, n2; | |
1757 | ||
1758 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1759 | * mode. */ | |
e2ebc74d JB |
1760 | if (atomic_read(&bss->num_sta_ps) > 0) |
1761 | /* in the hope that this is faster than | |
1762 | * checking byte-for-byte */ | |
1763 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1764 | IEEE80211_MAX_AID+1); | |
1765 | ||
1766 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1767 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1768 | else |
1769 | bss->dtim_count--; | |
1770 | ||
1771 | tim = pos = (u8 *) skb_put(skb, 6); | |
1772 | *pos++ = WLAN_EID_TIM; | |
1773 | *pos++ = 4; | |
1774 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1775 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1776 | |
1777 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1778 | aid0 = 1; | |
1779 | ||
1780 | if (have_bits) { | |
1781 | /* Find largest even number N1 so that bits numbered 1 through | |
1782 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1783 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1784 | n1 = 0; | |
1785 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1786 | if (bss->tim[i]) { | |
1787 | n1 = i & 0xfe; | |
1788 | break; | |
1789 | } | |
1790 | } | |
1791 | n2 = n1; | |
1792 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1793 | if (bss->tim[i]) { | |
1794 | n2 = i; | |
1795 | break; | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | /* Bitmap control */ | |
1800 | *pos++ = n1 | aid0; | |
1801 | /* Part Virt Bitmap */ | |
1802 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1803 | ||
1804 | tim[1] = n2 - n1 + 4; | |
1805 | skb_put(skb, n2 - n1); | |
1806 | } else { | |
1807 | *pos++ = aid0; /* Bitmap control */ | |
1808 | *pos++ = 0; /* Part Virt Bitmap */ | |
1809 | } | |
e2ebc74d JB |
1810 | } |
1811 | ||
32bfd35d | 1812 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1813 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1814 | { |
1815 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 1816 | struct sk_buff *skb = NULL; |
e039fa4a | 1817 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1818 | struct net_device *bdev; |
1819 | struct ieee80211_sub_if_data *sdata = NULL; | |
1820 | struct ieee80211_if_ap *ap = NULL; | |
9d139c81 | 1821 | struct ieee80211_if_sta *ifsta = NULL; |
1abbe498 | 1822 | struct rate_selection rsel; |
5dfdaf58 | 1823 | struct beacon_data *beacon; |
8318d78a | 1824 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 1825 | enum ieee80211_band band = local->hw.conf.channel->band; |
8318d78a | 1826 | |
2e92e6f2 | 1827 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1828 | |
1829 | rcu_read_lock(); | |
e2ebc74d | 1830 | |
32bfd35d JB |
1831 | sdata = vif_to_sdata(vif); |
1832 | bdev = sdata->dev; | |
e2ebc74d | 1833 | |
05c914fe | 1834 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
1835 | ap = &sdata->u.ap; |
1836 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1837 | if (ap && beacon) { |
1838 | /* | |
1839 | * headroom, head length, | |
1840 | * tail length and maximum TIM length | |
1841 | */ | |
1842 | skb = dev_alloc_skb(local->tx_headroom + | |
1843 | beacon->head_len + | |
1844 | beacon->tail_len + 256); | |
1845 | if (!skb) | |
1846 | goto out; | |
33b64eb2 | 1847 | |
902acc78 JB |
1848 | skb_reserve(skb, local->tx_headroom); |
1849 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1850 | beacon->head_len); | |
33b64eb2 | 1851 | |
d0709a65 JB |
1852 | /* |
1853 | * Not very nice, but we want to allow the driver to call | |
1854 | * ieee80211_beacon_get() as a response to the set_tim() | |
1855 | * callback. That, however, is already invoked under the | |
1856 | * sta_lock to guarantee consistent and race-free update | |
1857 | * of the tim bitmap in mac80211 and the driver. | |
1858 | */ | |
1859 | if (local->tim_in_locked_section) { | |
1860 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1861 | } else { | |
1862 | unsigned long flags; | |
1863 | ||
1864 | spin_lock_irqsave(&local->sta_lock, flags); | |
1865 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1866 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1867 | } | |
33b64eb2 | 1868 | |
902acc78 JB |
1869 | if (beacon->tail) |
1870 | memcpy(skb_put(skb, beacon->tail_len), | |
1871 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
1872 | } else |
1873 | goto out; | |
05c914fe | 1874 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
9d139c81 JB |
1875 | struct ieee80211_hdr *hdr; |
1876 | ifsta = &sdata->u.sta; | |
33b64eb2 | 1877 | |
9d139c81 JB |
1878 | if (!ifsta->probe_resp) |
1879 | goto out; | |
1880 | ||
1881 | skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC); | |
1882 | if (!skb) | |
1883 | goto out; | |
1884 | ||
1885 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
1886 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1887 | IEEE80211_STYPE_BEACON); | |
9d139c81 | 1888 | |
902acc78 | 1889 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
1890 | struct ieee80211_mgmt *mgmt; |
1891 | u8 *pos; | |
1892 | ||
902acc78 JB |
1893 | /* headroom, head length, tail length and maximum TIM length */ |
1894 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1895 | if (!skb) | |
1896 | goto out; | |
1897 | ||
1898 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1899 | mgmt = (struct ieee80211_mgmt *) | |
1900 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1901 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
1902 | mgmt->frame_control = |
1903 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
1904 | memset(mgmt->da, 0xff, ETH_ALEN); |
1905 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1906 | /* BSSID is left zeroed, wildcard value */ | |
1907 | mgmt->u.beacon.beacon_int = | |
1908 | cpu_to_le16(local->hw.conf.beacon_int); | |
1909 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1910 | ||
1911 | pos = skb_put(skb, 2); | |
1912 | *pos++ = WLAN_EID_SSID; | |
1913 | *pos++ = 0x0; | |
1914 | ||
f698d856 | 1915 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
1916 | } else { |
1917 | WARN_ON(1); | |
5dfdaf58 | 1918 | goto out; |
e2ebc74d JB |
1919 | } |
1920 | ||
e039fa4a JB |
1921 | info = IEEE80211_SKB_CB(skb); |
1922 | ||
d0f09804 JB |
1923 | skb->do_not_encrypt = 1; |
1924 | ||
e039fa4a JB |
1925 | info->band = band; |
1926 | rate_control_get_rate(local->mdev, sband, skb, &rsel); | |
e2ebc74d | 1927 | |
e039fa4a JB |
1928 | if (unlikely(rsel.rate_idx < 0)) { |
1929 | if (net_ratelimit()) { | |
1930 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " | |
1931 | "no rate found\n", | |
1932 | wiphy_name(local->hw.wiphy)); | |
1933 | } | |
1b024165 | 1934 | dev_kfree_skb_any(skb); |
e039fa4a JB |
1935 | skb = NULL; |
1936 | goto out; | |
e2ebc74d | 1937 | } |
e039fa4a JB |
1938 | |
1939 | info->control.vif = vif; | |
1940 | info->tx_rate_idx = rsel.rate_idx; | |
f591fa5d JB |
1941 | |
1942 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
1943 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1944 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e039fa4a JB |
1945 | if (sdata->bss_conf.use_short_preamble && |
1946 | sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1947 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; | |
f591fa5d | 1948 | |
e039fa4a | 1949 | info->antenna_sel_tx = local->hw.conf.antenna_sel_tx; |
e039fa4a | 1950 | info->control.retry_limit = 1; |
f591fa5d | 1951 | |
33b64eb2 | 1952 | out: |
5dfdaf58 | 1953 | rcu_read_unlock(); |
e2ebc74d JB |
1954 | return skb; |
1955 | } | |
1956 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1957 | ||
32bfd35d | 1958 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1959 | const void *frame, size_t frame_len, |
e039fa4a | 1960 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1961 | struct ieee80211_rts *rts) |
1962 | { | |
1963 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1964 | |
065e9605 HH |
1965 | rts->frame_control = |
1966 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
1967 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1968 | frame_txctl); | |
e2ebc74d JB |
1969 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1970 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1971 | } | |
1972 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1973 | ||
32bfd35d | 1974 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1975 | const void *frame, size_t frame_len, |
e039fa4a | 1976 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1977 | struct ieee80211_cts *cts) |
1978 | { | |
1979 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1980 | |
065e9605 HH |
1981 | cts->frame_control = |
1982 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
1983 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1984 | frame_len, frame_txctl); | |
e2ebc74d JB |
1985 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1986 | } | |
1987 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1988 | ||
1989 | struct sk_buff * | |
32bfd35d | 1990 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 1991 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1992 | { |
1993 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 1994 | struct sk_buff *skb = NULL; |
e2ebc74d | 1995 | struct sta_info *sta; |
5cf121c3 | 1996 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
1997 | struct net_device *bdev; |
1998 | struct ieee80211_sub_if_data *sdata; | |
1999 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2000 | struct beacon_data *beacon; |
e039fa4a | 2001 | struct ieee80211_tx_info *info; |
e2ebc74d | 2002 | |
32bfd35d JB |
2003 | sdata = vif_to_sdata(vif); |
2004 | bdev = sdata->dev; | |
747cf5e9 | 2005 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2006 | |
2007 | if (!bss) | |
e2ebc74d JB |
2008 | return NULL; |
2009 | ||
5dfdaf58 JB |
2010 | rcu_read_lock(); |
2011 | beacon = rcu_dereference(bss->beacon); | |
2012 | ||
05c914fe | 2013 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2014 | goto out; |
5dfdaf58 | 2015 | |
e2ebc74d | 2016 | if (bss->dtim_count != 0) |
747cf5e9 | 2017 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2018 | |
e2ebc74d JB |
2019 | while (1) { |
2020 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2021 | if (!skb) | |
747cf5e9 | 2022 | goto out; |
e2ebc74d JB |
2023 | local->total_ps_buffered--; |
2024 | ||
2025 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2026 | struct ieee80211_hdr *hdr = | |
2027 | (struct ieee80211_hdr *) skb->data; | |
2028 | /* more buffered multicast/broadcast frames ==> set | |
2029 | * MoreData flag in IEEE 802.11 header to inform PS | |
2030 | * STAs */ | |
2031 | hdr->frame_control |= | |
2032 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2033 | } | |
2034 | ||
e039fa4a | 2035 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev)) |
e2ebc74d JB |
2036 | break; |
2037 | dev_kfree_skb_any(skb); | |
2038 | } | |
e039fa4a JB |
2039 | |
2040 | info = IEEE80211_SKB_CB(skb); | |
2041 | ||
e2ebc74d | 2042 | sta = tx.sta; |
5cf121c3 JB |
2043 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2044 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2045 | info->band = tx.channel->band; |
e2ebc74d | 2046 | |
97b045d6 | 2047 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2048 | skb = NULL; |
97b045d6 | 2049 | out: |
d0709a65 | 2050 | rcu_read_unlock(); |
e2ebc74d JB |
2051 | |
2052 | return skb; | |
2053 | } | |
2054 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |