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 | { | |
065e9605 | 664 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2454948 JB |
665 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; |
666 | struct sk_buff **frags, *first, *frag; | |
667 | int i; | |
668 | u16 seq; | |
669 | u8 *pos; | |
670 | int frag_threshold = tx->local->fragmentation_threshold; | |
671 | ||
672 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
673 | return TX_CONTINUE; | |
674 | ||
eefce91a JB |
675 | /* |
676 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
677 | * This scenario is handled in __ieee80211_tx_prepare but extra |
678 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a JB |
679 | */ |
680 | if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU || | |
e2530083 JB |
681 | skb_get_queue_mapping(tx->skb) >= |
682 | ieee80211_num_regular_queues(&tx->local->hw))) | |
eefce91a JB |
683 | return TX_DROP; |
684 | ||
e2454948 JB |
685 | first = tx->skb; |
686 | ||
065e9605 | 687 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 JB |
688 | payload_len = first->len - hdrlen; |
689 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
690 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
691 | ||
692 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
693 | if (!frags) | |
694 | goto fail; | |
695 | ||
696 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
697 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
698 | pos = first->data + hdrlen + per_fragm; | |
699 | left = payload_len - per_fragm; | |
700 | for (i = 0; i < num_fragm - 1; i++) { | |
701 | struct ieee80211_hdr *fhdr; | |
e6a9854b | 702 | struct ieee80211_tx_info *info; |
e2454948 JB |
703 | size_t copylen; |
704 | ||
705 | if (left <= 0) | |
706 | goto fail; | |
707 | ||
708 | /* reserve enough extra head and tail room for possible | |
709 | * encryption */ | |
710 | frag = frags[i] = | |
711 | dev_alloc_skb(tx->local->tx_headroom + | |
712 | frag_threshold + | |
713 | IEEE80211_ENCRYPT_HEADROOM + | |
714 | IEEE80211_ENCRYPT_TAILROOM); | |
715 | if (!frag) | |
716 | goto fail; | |
e6a9854b | 717 | |
e2454948 JB |
718 | /* Make sure that all fragments use the same priority so |
719 | * that they end up using the same TX queue */ | |
720 | frag->priority = first->priority; | |
e6a9854b | 721 | |
e2454948 JB |
722 | skb_reserve(frag, tx->local->tx_headroom + |
723 | IEEE80211_ENCRYPT_HEADROOM); | |
e6a9854b JB |
724 | |
725 | /* copy TX information */ | |
726 | info = IEEE80211_SKB_CB(frag); | |
727 | memcpy(info, first->cb, sizeof(frag->cb)); | |
728 | ||
729 | /* copy/fill in 802.11 header */ | |
e2454948 JB |
730 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); |
731 | memcpy(fhdr, first->data, hdrlen); | |
e2454948 | 732 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); |
e6a9854b JB |
733 | |
734 | if (i == num_fragm - 2) { | |
735 | /* clear MOREFRAGS bit for the last fragment */ | |
736 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
737 | } else { | |
738 | /* | |
739 | * No multi-rate retries for fragmented frames, that | |
740 | * would completely throw off the NAV at other STAs. | |
741 | */ | |
742 | info->control.rates[1].idx = -1; | |
743 | info->control.rates[2].idx = -1; | |
744 | info->control.rates[3].idx = -1; | |
745 | info->control.rates[4].idx = -1; | |
746 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
747 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
748 | } | |
749 | ||
750 | /* copy data */ | |
e2454948 JB |
751 | copylen = left > per_fragm ? per_fragm : left; |
752 | memcpy(skb_put(frag, copylen), pos, copylen); | |
e6a9854b | 753 | |
03f93c3d | 754 | skb_copy_queue_mapping(frag, first); |
e6a9854b | 755 | |
d0f09804 | 756 | frag->do_not_encrypt = first->do_not_encrypt; |
e2454948 JB |
757 | |
758 | pos += copylen; | |
759 | left -= copylen; | |
e2ebc74d | 760 | } |
e2454948 JB |
761 | skb_trim(first, hdrlen + per_fragm); |
762 | ||
763 | tx->num_extra_frag = num_fragm - 1; | |
764 | tx->extra_frag = frags; | |
e2ebc74d | 765 | |
9ae54c84 | 766 | return TX_CONTINUE; |
e2454948 JB |
767 | |
768 | fail: | |
e2454948 JB |
769 | if (frags) { |
770 | for (i = 0; i < num_fragm - 1; i++) | |
771 | if (frags[i]) | |
772 | dev_kfree_skb(frags[i]); | |
773 | kfree(frags); | |
774 | } | |
775 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
776 | return TX_DROP; | |
e2ebc74d JB |
777 | } |
778 | ||
d9e8a70f | 779 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
780 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
781 | { | |
782 | if (!tx->key) | |
783 | return TX_CONTINUE; | |
784 | ||
785 | switch (tx->key->conf.alg) { | |
786 | case ALG_WEP: | |
787 | return ieee80211_crypto_wep_encrypt(tx); | |
788 | case ALG_TKIP: | |
789 | return ieee80211_crypto_tkip_encrypt(tx); | |
790 | case ALG_CCMP: | |
791 | return ieee80211_crypto_ccmp_encrypt(tx); | |
792 | } | |
793 | ||
794 | /* not reached */ | |
795 | WARN_ON(1); | |
796 | return TX_DROP; | |
797 | } | |
798 | ||
d9e8a70f | 799 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
800 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
801 | { | |
802 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
803 | int next_len, i; | |
804 | int group_addr = is_multicast_ether_addr(hdr->addr1); | |
805 | ||
806 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) { | |
807 | hdr->duration_id = ieee80211_duration(tx, group_addr, 0); | |
808 | return TX_CONTINUE; | |
809 | } | |
810 | ||
811 | hdr->duration_id = ieee80211_duration(tx, group_addr, | |
812 | tx->extra_frag[0]->len); | |
813 | ||
814 | for (i = 0; i < tx->num_extra_frag; i++) { | |
e6a9854b | 815 | if (i + 1 < tx->num_extra_frag) |
03f93c3d | 816 | next_len = tx->extra_frag[i + 1]->len; |
e6a9854b | 817 | else |
03f93c3d | 818 | next_len = 0; |
03f93c3d JB |
819 | |
820 | hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data; | |
821 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); | |
822 | } | |
823 | ||
824 | return TX_CONTINUE; | |
825 | } | |
826 | ||
d9e8a70f | 827 | static ieee80211_tx_result debug_noinline |
e2454948 | 828 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 829 | { |
9e72ebd6 | 830 | int i; |
e2ebc74d | 831 | |
9e72ebd6 JB |
832 | if (!tx->sta) |
833 | return TX_CONTINUE; | |
e2ebc74d | 834 | |
9e72ebd6 JB |
835 | tx->sta->tx_packets++; |
836 | tx->sta->tx_fragments++; | |
837 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 838 | if (tx->extra_frag) { |
9e72ebd6 JB |
839 | tx->sta->tx_fragments += tx->num_extra_frag; |
840 | for (i = 0; i < tx->num_extra_frag; i++) | |
841 | tx->sta->tx_bytes += tx->extra_frag[i]->len; | |
e2454948 JB |
842 | } |
843 | ||
9ae54c84 | 844 | return TX_CONTINUE; |
e2ebc74d JB |
845 | } |
846 | ||
e2ebc74d | 847 | |
e2ebc74d JB |
848 | /* actual transmit path */ |
849 | ||
850 | /* | |
851 | * deal with packet injection down monitor interface | |
852 | * with Radiotap Header -- only called for monitor mode interface | |
853 | */ | |
9ae54c84 | 854 | static ieee80211_tx_result |
5cf121c3 | 855 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 856 | struct sk_buff *skb) |
e2ebc74d JB |
857 | { |
858 | /* | |
859 | * this is the moment to interpret and discard the radiotap header that | |
860 | * must be at the start of the packet injected in Monitor mode | |
861 | * | |
862 | * Need to take some care with endian-ness since radiotap | |
863 | * args are little-endian | |
864 | */ | |
865 | ||
866 | struct ieee80211_radiotap_iterator iterator; | |
867 | struct ieee80211_radiotap_header *rthdr = | |
868 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 869 | struct ieee80211_supported_band *sband; |
e2ebc74d JB |
870 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
871 | ||
2e92e6f2 | 872 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 873 | |
d0f09804 | 874 | skb->do_not_encrypt = 1; |
5cf121c3 | 875 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
876 | |
877 | /* | |
878 | * for every radiotap entry that is present | |
879 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
880 | * entries present, or -EINVAL on error) | |
881 | */ | |
882 | ||
883 | while (!ret) { | |
e2ebc74d JB |
884 | ret = ieee80211_radiotap_iterator_next(&iterator); |
885 | ||
886 | if (ret) | |
887 | continue; | |
888 | ||
889 | /* see if this argument is something we can use */ | |
890 | switch (iterator.this_arg_index) { | |
891 | /* | |
892 | * You must take care when dereferencing iterator.this_arg | |
893 | * for multibyte types... the pointer is not aligned. Use | |
894 | * get_unaligned((type *)iterator.this_arg) to dereference | |
895 | * iterator.this_arg for type "type" safely on all arches. | |
896 | */ | |
e2ebc74d JB |
897 | case IEEE80211_RADIOTAP_FLAGS: |
898 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
899 | /* | |
900 | * this indicates that the skb we have been | |
901 | * handed has the 32-bit FCS CRC at the end... | |
902 | * we should react to that by snipping it off | |
903 | * because it will be recomputed and added | |
904 | * on transmission | |
905 | */ | |
906 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 907 | return TX_DROP; |
e2ebc74d JB |
908 | |
909 | skb_trim(skb, skb->len - FCS_LEN); | |
910 | } | |
58d4185e | 911 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 912 | tx->skb->do_not_encrypt = 0; |
58d4185e | 913 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 914 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
915 | break; |
916 | ||
58d4185e JB |
917 | /* |
918 | * Please update the file | |
919 | * Documentation/networking/mac80211-injection.txt | |
920 | * when parsing new fields here. | |
921 | */ | |
922 | ||
e2ebc74d JB |
923 | default: |
924 | break; | |
925 | } | |
926 | } | |
927 | ||
928 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 929 | return TX_DROP; |
e2ebc74d JB |
930 | |
931 | /* | |
932 | * remove the radiotap header | |
933 | * iterator->max_length was sanity-checked against | |
934 | * skb->len by iterator init | |
935 | */ | |
936 | skb_pull(skb, iterator.max_length); | |
937 | ||
9ae54c84 | 938 | return TX_CONTINUE; |
e2ebc74d JB |
939 | } |
940 | ||
58d4185e JB |
941 | /* |
942 | * initialises @tx | |
943 | */ | |
9ae54c84 | 944 | static ieee80211_tx_result |
5cf121c3 | 945 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 946 | struct sk_buff *skb, |
e039fa4a | 947 | struct net_device *dev) |
e2ebc74d JB |
948 | { |
949 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 950 | struct ieee80211_hdr *hdr; |
e2ebc74d | 951 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 952 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
953 | |
954 | int hdrlen; | |
955 | ||
956 | memset(tx, 0, sizeof(*tx)); | |
957 | tx->skb = skb; | |
958 | tx->dev = dev; /* use original interface */ | |
959 | tx->local = local; | |
960 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 961 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 962 | /* |
58d4185e JB |
963 | * Set this flag (used below to indicate "automatic fragmentation"), |
964 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 965 | */ |
5cf121c3 | 966 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
967 | |
968 | /* process and remove the injection radiotap header */ | |
969 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
25d834e1 | 970 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
9ae54c84 JB |
971 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
972 | return TX_DROP; | |
58d4185e | 973 | |
e2ebc74d | 974 | /* |
58d4185e JB |
975 | * __ieee80211_parse_tx_radiotap has now removed |
976 | * the radiotap header that was present and pre-filled | |
977 | * 'tx' with tx control information. | |
e2ebc74d | 978 | */ |
e2ebc74d JB |
979 | } |
980 | ||
58d4185e JB |
981 | hdr = (struct ieee80211_hdr *) skb->data; |
982 | ||
24338793 | 983 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 984 | |
badffb72 | 985 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 986 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 987 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 988 | } else { |
5cf121c3 | 989 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 990 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 991 | } |
58d4185e | 992 | |
5cf121c3 JB |
993 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
994 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 995 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 RR |
996 | !local->ops->set_frag_threshold && |
997 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) | |
5cf121c3 | 998 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 999 | else |
5cf121c3 | 1000 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1001 | } |
1002 | ||
e2ebc74d | 1003 | if (!tx->sta) |
e039fa4a | 1004 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1005 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1006 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1007 | |
b73d70ad | 1008 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1009 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1010 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1011 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1012 | } | |
e039fa4a | 1013 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1014 | |
9ae54c84 | 1015 | return TX_CONTINUE; |
e2ebc74d JB |
1016 | } |
1017 | ||
32bfd35d | 1018 | /* |
58d4185e JB |
1019 | * NB: @tx is uninitialised when passed in here |
1020 | */ | |
133b8226 JB |
1021 | static int ieee80211_tx_prepare(struct ieee80211_local *local, |
1022 | struct ieee80211_tx_data *tx, | |
1023 | struct sk_buff *skb) | |
e2ebc74d | 1024 | { |
e2ebc74d JB |
1025 | struct net_device *dev; |
1026 | ||
d0f09804 | 1027 | dev = dev_get_by_index(&init_net, skb->iif); |
133b8226 | 1028 | if (unlikely(dev && !is_ieee80211_device(local, dev))) { |
e2ebc74d JB |
1029 | dev_put(dev); |
1030 | dev = NULL; | |
1031 | } | |
1032 | if (unlikely(!dev)) | |
1033 | return -ENODEV; | |
58d4185e | 1034 | /* initialises tx with control */ |
e039fa4a | 1035 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1036 | dev_put(dev); |
e2ebc74d JB |
1037 | return 0; |
1038 | } | |
1039 | ||
1040 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1041 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1042 | { |
f8e79ddd | 1043 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1044 | int ret, i; |
1045 | ||
e2ebc74d | 1046 | if (skb) { |
f8e79ddd TW |
1047 | if (netif_subqueue_stopped(local->mdev, skb)) |
1048 | return IEEE80211_TX_AGAIN; | |
1049 | info = IEEE80211_SKB_CB(skb); | |
1050 | ||
e039fa4a | 1051 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1052 | if (ret) |
1053 | return IEEE80211_TX_AGAIN; | |
1054 | local->mdev->trans_start = jiffies; | |
1055 | ieee80211_led_tx(local, 1); | |
1056 | } | |
5cf121c3 | 1057 | if (tx->extra_frag) { |
5cf121c3 JB |
1058 | for (i = 0; i < tx->num_extra_frag; i++) { |
1059 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1060 | continue; |
e039fa4a | 1061 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
e6a9854b | 1062 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1063 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
e2530083 JB |
1064 | if (netif_subqueue_stopped(local->mdev, |
1065 | tx->extra_frag[i])) | |
e2ebc74d | 1066 | return IEEE80211_TX_FRAG_AGAIN; |
e2ebc74d | 1067 | |
e2ebc74d | 1068 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1069 | tx->extra_frag[i]); |
e2ebc74d JB |
1070 | if (ret) |
1071 | return IEEE80211_TX_FRAG_AGAIN; | |
1072 | local->mdev->trans_start = jiffies; | |
1073 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1074 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1075 | } |
5cf121c3 JB |
1076 | kfree(tx->extra_frag); |
1077 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1078 | } |
1079 | return IEEE80211_TX_OK; | |
1080 | } | |
1081 | ||
97b045d6 JB |
1082 | /* |
1083 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1084 | * frame was dropped or queued. | |
1085 | */ | |
1086 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1087 | { | |
97b045d6 | 1088 | struct sk_buff *skb = tx->skb; |
97b045d6 JB |
1089 | ieee80211_tx_result res = TX_DROP; |
1090 | int i; | |
1091 | ||
d9e8a70f JB |
1092 | #define CALL_TXH(txh) \ |
1093 | res = txh(tx); \ | |
1094 | if (res != TX_CONTINUE) \ | |
1095 | goto txh_done; | |
1096 | ||
1097 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1098 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1099 | CALL_TXH(ieee80211_tx_h_select_key) | |
1100 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1101 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1102 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1103 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1104 | CALL_TXH(ieee80211_tx_h_fragment) |
1105 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1106 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1107 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1108 | CALL_TXH(ieee80211_tx_h_stats) | |
1109 | #undef CALL_TXH | |
97b045d6 | 1110 | |
d9e8a70f | 1111 | txh_done: |
97b045d6 | 1112 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1113 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
97b045d6 JB |
1114 | dev_kfree_skb(skb); |
1115 | for (i = 0; i < tx->num_extra_frag; i++) | |
1116 | if (tx->extra_frag[i]) | |
1117 | dev_kfree_skb(tx->extra_frag[i]); | |
1118 | kfree(tx->extra_frag); | |
1119 | return -1; | |
1120 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1121 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1122 | return -1; |
1123 | } | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
e039fa4a | 1128 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1129 | { |
1130 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1131 | struct sta_info *sta; | |
5cf121c3 | 1132 | struct ieee80211_tx_data tx; |
97b045d6 | 1133 | ieee80211_tx_result res_prepare; |
e039fa4a | 1134 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1135 | int ret, i; |
e2530083 | 1136 | u16 queue; |
e2ebc74d | 1137 | |
e2530083 JB |
1138 | queue = skb_get_queue_mapping(skb); |
1139 | ||
1140 | WARN_ON(test_bit(queue, local->queues_pending)); | |
e2ebc74d JB |
1141 | |
1142 | if (unlikely(skb->len < 10)) { | |
1143 | dev_kfree_skb(skb); | |
1144 | return 0; | |
1145 | } | |
1146 | ||
d0709a65 JB |
1147 | rcu_read_lock(); |
1148 | ||
58d4185e | 1149 | /* initialises tx */ |
e039fa4a | 1150 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1151 | |
9ae54c84 | 1152 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1153 | dev_kfree_skb(skb); |
d0709a65 | 1154 | rcu_read_unlock(); |
e2ebc74d JB |
1155 | return 0; |
1156 | } | |
1157 | ||
1158 | sta = tx.sta; | |
5cf121c3 | 1159 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1160 | info->band = tx.channel->band; |
e2ebc74d | 1161 | |
97b045d6 JB |
1162 | if (invoke_tx_handlers(&tx)) |
1163 | goto out; | |
e2ebc74d | 1164 | |
e2ebc74d JB |
1165 | retry: |
1166 | ret = __ieee80211_tx(local, skb, &tx); | |
1167 | if (ret) { | |
eefce91a JB |
1168 | struct ieee80211_tx_stored_packet *store; |
1169 | ||
1170 | /* | |
1171 | * Since there are no fragmented frames on A-MPDU | |
1172 | * queues, there's no reason for a driver to reject | |
1173 | * a frame there, warn and drop it. | |
1174 | */ | |
e2530083 | 1175 | if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw))) |
eefce91a JB |
1176 | goto drop; |
1177 | ||
1178 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1179 | |
1180 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1181 | skb = NULL; | |
f8e79ddd | 1182 | |
e2530083 | 1183 | set_bit(queue, local->queues_pending); |
e2ebc74d | 1184 | smp_mb(); |
e2530083 JB |
1185 | /* |
1186 | * When the driver gets out of buffers during sending of | |
1187 | * fragments and calls ieee80211_stop_queue, the netif | |
1188 | * subqueue is stopped. There is, however, a small window | |
1189 | * in which the PENDING bit is not yet set. If a buffer | |
e2ebc74d JB |
1190 | * gets available in that window (i.e. driver calls |
1191 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
e2530083 | 1192 | * called with the PENDING bit still set. Prevent this by |
e2ebc74d | 1193 | * continuing transmitting here when that situation is |
e2530083 JB |
1194 | * possible to have happened. |
1195 | */ | |
1196 | if (!__netif_subqueue_stopped(local->mdev, queue)) { | |
1197 | clear_bit(queue, local->queues_pending); | |
e2ebc74d JB |
1198 | goto retry; |
1199 | } | |
e2ebc74d | 1200 | store->skb = skb; |
5cf121c3 JB |
1201 | store->extra_frag = tx.extra_frag; |
1202 | store->num_extra_frag = tx.num_extra_frag; | |
e2ebc74d | 1203 | } |
97b045d6 | 1204 | out: |
d4e46a3d | 1205 | rcu_read_unlock(); |
e2ebc74d JB |
1206 | return 0; |
1207 | ||
1208 | drop: | |
1209 | if (skb) | |
1210 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1211 | for (i = 0; i < tx.num_extra_frag; i++) |
1212 | if (tx.extra_frag[i]) | |
1213 | dev_kfree_skb(tx.extra_frag[i]); | |
1214 | kfree(tx.extra_frag); | |
d4e46a3d | 1215 | rcu_read_unlock(); |
e2ebc74d JB |
1216 | return 0; |
1217 | } | |
1218 | ||
1219 | /* device xmit handlers */ | |
1220 | ||
23c0752a JB |
1221 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1222 | struct sk_buff *skb, | |
1223 | int head_need, bool may_encrypt) | |
1224 | { | |
1225 | int tail_need = 0; | |
1226 | ||
1227 | /* | |
1228 | * This could be optimised, devices that do full hardware | |
1229 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1230 | * have no drivers for such devices currently. | |
1231 | */ | |
1232 | if (may_encrypt) { | |
1233 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1234 | tail_need -= skb_tailroom(skb); | |
1235 | tail_need = max_t(int, tail_need, 0); | |
1236 | } | |
1237 | ||
1238 | if (head_need || tail_need) { | |
1239 | /* Sorry. Can't account for this any more */ | |
1240 | skb_orphan(skb); | |
1241 | } | |
1242 | ||
1243 | if (skb_header_cloned(skb)) | |
1244 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1245 | else | |
1246 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1247 | ||
1248 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1249 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1250 | wiphy_name(local->hw.wiphy)); | |
1251 | return -ENOMEM; | |
1252 | } | |
1253 | ||
1254 | /* update truesize too */ | |
1255 | skb->truesize += head_need + tail_need; | |
1256 | ||
1257 | return 0; | |
1258 | } | |
1259 | ||
8ef9dad3 | 1260 | int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev) |
e2ebc74d | 1261 | { |
133b8226 JB |
1262 | struct ieee80211_master_priv *mpriv = netdev_priv(dev); |
1263 | struct ieee80211_local *local = mpriv->local; | |
e039fa4a | 1264 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1265 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1266 | struct net_device *odev = NULL; |
1267 | struct ieee80211_sub_if_data *osdata; | |
1268 | int headroom; | |
23c0752a | 1269 | bool may_encrypt; |
25d834e1 JB |
1270 | enum { |
1271 | NOT_MONITOR, | |
1272 | FOUND_SDATA, | |
1273 | UNKNOWN_ADDRESS, | |
1274 | } monitor_iface = NOT_MONITOR; | |
e2ebc74d JB |
1275 | int ret; |
1276 | ||
d0f09804 JB |
1277 | if (skb->iif) |
1278 | odev = dev_get_by_index(&init_net, skb->iif); | |
133b8226 | 1279 | if (unlikely(odev && !is_ieee80211_device(local, odev))) { |
e2ebc74d JB |
1280 | dev_put(odev); |
1281 | odev = NULL; | |
1282 | } | |
1283 | if (unlikely(!odev)) { | |
1284 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1285 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1286 | "originating device\n", dev->name); | |
1287 | #endif | |
1288 | dev_kfree_skb(skb); | |
1289 | return 0; | |
1290 | } | |
e039fa4a | 1291 | |
d0f09804 JB |
1292 | memset(info, 0, sizeof(*info)); |
1293 | ||
1294 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1295 | ||
e2ebc74d JB |
1296 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1297 | ||
e32f85f7 LCC |
1298 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1299 | ieee80211_is_data(hdr->frame_control)) { | |
f74b6a54 RR |
1300 | if (is_multicast_ether_addr(hdr->addr3)) |
1301 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1302 | else | |
1303 | if (mesh_nexthop_lookup(skb, osdata)) | |
1304 | return 0; | |
1305 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) | |
1306 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh, | |
1307 | fwded_frames); | |
25d834e1 JB |
1308 | } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
1309 | struct ieee80211_sub_if_data *sdata; | |
25d834e1 JB |
1310 | int hdrlen; |
1311 | u16 len_rthdr; | |
1312 | ||
1313 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
1314 | monitor_iface = UNKNOWN_ADDRESS; | |
1315 | ||
1316 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1317 | hdr = (struct ieee80211_hdr *)skb->data + len_rthdr; | |
1318 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1319 | ||
1320 | /* check the header is complete in the frame */ | |
1321 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1322 | /* | |
1323 | * We process outgoing injected frames that have a | |
1324 | * local address we handle as though they are our | |
1325 | * own frames. | |
1326 | * This code here isn't entirely correct, the local | |
1327 | * MAC address is not necessarily enough to find | |
1328 | * the interface to use; for that proper VLAN/WDS | |
1329 | * support we will need a different mechanism. | |
1330 | */ | |
1331 | ||
1332 | rcu_read_lock(); | |
1333 | list_for_each_entry_rcu(sdata, &local->interfaces, | |
1334 | list) { | |
1335 | if (!netif_running(sdata->dev)) | |
1336 | continue; | |
1337 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1338 | hdr->addr2)) { | |
1339 | dev_hold(sdata->dev); | |
1340 | dev_put(odev); | |
1341 | osdata = sdata; | |
1342 | odev = osdata->dev; | |
1343 | skb->iif = sdata->dev->ifindex; | |
1344 | monitor_iface = FOUND_SDATA; | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | rcu_read_unlock(); | |
1349 | } | |
e32f85f7 LCC |
1350 | } |
1351 | ||
d0f09804 | 1352 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1353 | |
1354 | headroom = osdata->local->tx_headroom; | |
1355 | if (may_encrypt) | |
1356 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1357 | headroom -= skb_headroom(skb); | |
1358 | headroom = max_t(int, 0, headroom); | |
1359 | ||
1360 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1361 | dev_kfree_skb(skb); | |
1362 | dev_put(odev); | |
1363 | return 0; | |
e2ebc74d JB |
1364 | } |
1365 | ||
30613070 JB |
1366 | if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
1367 | osdata = container_of(osdata->bss, | |
1368 | struct ieee80211_sub_if_data, | |
1369 | u.ap); | |
25d834e1 JB |
1370 | if (likely(monitor_iface != UNKNOWN_ADDRESS)) |
1371 | info->control.vif = &osdata->vif; | |
e039fa4a | 1372 | ret = ieee80211_tx(odev, skb); |
e2ebc74d JB |
1373 | dev_put(odev); |
1374 | ||
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1379 | struct net_device *dev) | |
1380 | { | |
1381 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1382 | struct ieee80211_radiotap_header *prthdr = |
1383 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1384 | u16 len_rthdr; |
e2ebc74d | 1385 | |
9b8a74e3 AG |
1386 | /* check for not even having the fixed radiotap header part */ |
1387 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1388 | goto fail; /* too short to be possibly valid */ | |
1389 | ||
1390 | /* is it a header version we can trust to find length from? */ | |
1391 | if (unlikely(prthdr->it_version)) | |
1392 | goto fail; /* only version 0 is supported */ | |
1393 | ||
1394 | /* then there must be a radiotap header with a length we can use */ | |
1395 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1396 | ||
1397 | /* does the skb contain enough to deliver on the alleged length? */ | |
1398 | if (unlikely(skb->len < len_rthdr)) | |
1399 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1400 | |
1401 | skb->dev = local->mdev; | |
1402 | ||
9b8a74e3 | 1403 | /* needed because we set skb device to master */ |
d0f09804 | 1404 | skb->iif = dev->ifindex; |
9b8a74e3 | 1405 | |
d0f09804 JB |
1406 | /* sometimes we do encrypt injected frames, will be fixed |
1407 | * up in radiotap parser if not wanted */ | |
1408 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1409 | |
e2ebc74d JB |
1410 | /* |
1411 | * fix up the pointers accounting for the radiotap | |
1412 | * header still being in there. We are being given | |
1413 | * a precooked IEEE80211 header so no need for | |
1414 | * normal processing | |
1415 | */ | |
9b8a74e3 | 1416 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1417 | /* |
9b8a74e3 AG |
1418 | * these are just fixed to the end of the rt area since we |
1419 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1420 | */ |
9b8a74e3 AG |
1421 | skb_set_network_header(skb, len_rthdr); |
1422 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1423 | |
9b8a74e3 AG |
1424 | /* pass the radiotap header up to the next stage intact */ |
1425 | dev_queue_xmit(skb); | |
e2ebc74d | 1426 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1427 | |
1428 | fail: | |
1429 | dev_kfree_skb(skb); | |
1430 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1431 | } |
1432 | ||
1433 | /** | |
1434 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1435 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1436 | * @skb: packet to be sent | |
1437 | * @dev: incoming interface | |
1438 | * | |
1439 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1440 | * not be freed, and caller is responsible for either retrying later or freeing | |
1441 | * skb). | |
1442 | * | |
1443 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1444 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1445 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1446 | * transmission (through low-level driver). | |
1447 | */ | |
1448 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1449 | struct net_device *dev) | |
1450 | { | |
133b8226 JB |
1451 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1452 | struct ieee80211_local *local = sdata->local; | |
e2ebc74d | 1453 | int ret = 1, head_need; |
065e9605 HH |
1454 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1455 | __le16 fc; | |
e2ebc74d | 1456 | struct ieee80211_hdr hdr; |
33b64eb2 | 1457 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1458 | const u8 *encaps_data; |
1459 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1460 | int nh_pos, h_pos; |
e2ebc74d | 1461 | struct sta_info *sta; |
ce3edf6d | 1462 | u32 sta_flags = 0; |
e2ebc74d | 1463 | |
e2ebc74d | 1464 | if (unlikely(skb->len < ETH_HLEN)) { |
e2ebc74d JB |
1465 | ret = 0; |
1466 | goto fail; | |
1467 | } | |
1468 | ||
1469 | nh_pos = skb_network_header(skb) - skb->data; | |
1470 | h_pos = skb_transport_header(skb) - skb->data; | |
1471 | ||
1472 | /* convert Ethernet header to proper 802.11 header (based on | |
1473 | * operation mode) */ | |
1474 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1475 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1476 | |
51fb61e7 | 1477 | switch (sdata->vif.type) { |
05c914fe JB |
1478 | case NL80211_IFTYPE_AP: |
1479 | case NL80211_IFTYPE_AP_VLAN: | |
065e9605 | 1480 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1481 | /* DA BSSID SA */ |
1482 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1483 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1484 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1485 | hdrlen = 24; | |
cf966838 | 1486 | break; |
05c914fe | 1487 | case NL80211_IFTYPE_WDS: |
065e9605 | 1488 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1489 | /* RA TA DA SA */ |
1490 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1491 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1492 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1493 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1494 | hdrlen = 30; | |
cf966838 | 1495 | break; |
33b64eb2 | 1496 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1497 | case NL80211_IFTYPE_MESH_POINT: |
065e9605 | 1498 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
472dbc45 | 1499 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1500 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1501 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
e32f85f7 LCC |
1502 | ret = 0; |
1503 | goto fail; | |
33b64eb2 | 1504 | } |
79617dee Y |
1505 | memset(&mesh_hdr, 0, sizeof(mesh_hdr)); |
1506 | ||
1507 | if (compare_ether_addr(dev->dev_addr, | |
1508 | skb->data + ETH_ALEN) == 0) { | |
1509 | /* RA TA DA SA */ | |
1510 | memset(hdr.addr1, 0, ETH_ALEN); | |
1511 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1512 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1513 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1514 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); | |
1515 | } else { | |
1516 | /* packet from other interface */ | |
1517 | struct mesh_path *mppath; | |
1518 | ||
1519 | memset(hdr.addr1, 0, ETH_ALEN); | |
1520 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1521 | memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN); | |
1522 | ||
1523 | if (is_multicast_ether_addr(skb->data)) | |
1524 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1525 | else { | |
1526 | rcu_read_lock(); | |
1527 | mppath = mpp_path_lookup(skb->data, sdata); | |
1528 | if (mppath) | |
1529 | memcpy(hdr.addr3, mppath->mpp, ETH_ALEN); | |
1530 | else | |
1531 | memset(hdr.addr3, 0xff, ETH_ALEN); | |
1532 | rcu_read_unlock(); | |
1533 | } | |
1534 | ||
1535 | mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6; | |
1536 | mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; | |
1537 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum); | |
1538 | memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN); | |
1539 | memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1540 | sdata->u.mesh.mesh_seqnum++; | |
1541 | meshhdrlen = 18; | |
1542 | } | |
33b64eb2 LCC |
1543 | hdrlen = 30; |
1544 | break; | |
1545 | #endif | |
05c914fe | 1546 | case NL80211_IFTYPE_STATION: |
065e9605 | 1547 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1548 | /* BSSID SA DA */ |
1549 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1550 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1551 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1552 | hdrlen = 24; | |
cf966838 | 1553 | break; |
05c914fe | 1554 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1555 | /* DA SA BSSID */ |
1556 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1557 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1558 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1559 | hdrlen = 24; | |
cf966838 JB |
1560 | break; |
1561 | default: | |
e2ebc74d JB |
1562 | ret = 0; |
1563 | goto fail; | |
1564 | } | |
1565 | ||
7d185b8b JB |
1566 | /* |
1567 | * There's no need to try to look up the destination | |
1568 | * if it is a multicast address (which can only happen | |
1569 | * in AP mode) | |
1570 | */ | |
1571 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1572 | rcu_read_lock(); |
7d185b8b | 1573 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1574 | if (sta) |
07346f81 | 1575 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1576 | rcu_read_unlock(); |
e2ebc74d JB |
1577 | } |
1578 | ||
3434fbd3 | 1579 | /* receiver and we are QoS enabled, use a QoS type frame */ |
e2530083 JB |
1580 | if (sta_flags & WLAN_STA_WME && |
1581 | ieee80211_num_regular_queues(&local->hw) >= 4) { | |
065e9605 | 1582 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1583 | hdrlen += 2; |
1584 | } | |
1585 | ||
1586 | /* | |
238814fd JB |
1587 | * Drop unicast frames to unauthorised stations unless they are |
1588 | * EAPOL frames from the local station. | |
ce3edf6d | 1589 | */ |
e32f85f7 LCC |
1590 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1591 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1592 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1593 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1594 | compare_ether_addr(dev->dev_addr, |
1595 | skb->data + ETH_ALEN) == 0))) { | |
1596 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1597 | if (net_ratelimit()) |
0c68ae26 | 1598 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1599 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1600 | hdr.addr1); |
ce3edf6d JB |
1601 | #endif |
1602 | ||
1603 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1604 | ||
1605 | ret = 0; | |
1606 | goto fail; | |
1607 | } | |
1608 | ||
065e9605 | 1609 | hdr.frame_control = fc; |
e2ebc74d JB |
1610 | hdr.duration_id = 0; |
1611 | hdr.seq_ctrl = 0; | |
1612 | ||
1613 | skip_header_bytes = ETH_HLEN; | |
1614 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1615 | encaps_data = bridge_tunnel_header; | |
1616 | encaps_len = sizeof(bridge_tunnel_header); | |
1617 | skip_header_bytes -= 2; | |
1618 | } else if (ethertype >= 0x600) { | |
1619 | encaps_data = rfc1042_header; | |
1620 | encaps_len = sizeof(rfc1042_header); | |
1621 | skip_header_bytes -= 2; | |
1622 | } else { | |
1623 | encaps_data = NULL; | |
1624 | encaps_len = 0; | |
1625 | } | |
1626 | ||
1627 | skb_pull(skb, skip_header_bytes); | |
1628 | nh_pos -= skip_header_bytes; | |
1629 | h_pos -= skip_header_bytes; | |
1630 | ||
23c0752a | 1631 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1632 | |
23c0752a JB |
1633 | /* |
1634 | * So we need to modify the skb header and hence need a copy of | |
1635 | * that. The head_need variable above doesn't, so far, include | |
1636 | * the needed header space that we don't need right away. If we | |
1637 | * can, then we don't reallocate right now but only after the | |
1638 | * frame arrives at the master device (if it does...) | |
1639 | * | |
1640 | * If we cannot, however, then we will reallocate to include all | |
1641 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1642 | * make it big enough for everything we may ever need. | |
1643 | */ | |
e2ebc74d | 1644 | |
3a5be7d4 | 1645 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1646 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1647 | head_need += local->tx_headroom; | |
1648 | head_need = max_t(int, 0, head_need); | |
1649 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1650 | goto fail; |
e2ebc74d JB |
1651 | } |
1652 | ||
1653 | if (encaps_data) { | |
1654 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1655 | nh_pos += encaps_len; | |
1656 | h_pos += encaps_len; | |
1657 | } | |
c29b9b9b | 1658 | |
33b64eb2 LCC |
1659 | if (meshhdrlen > 0) { |
1660 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1661 | nh_pos += meshhdrlen; | |
1662 | h_pos += meshhdrlen; | |
1663 | } | |
1664 | ||
065e9605 | 1665 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1666 | __le16 *qos_control; |
1667 | ||
1668 | qos_control = (__le16*) skb_push(skb, 2); | |
1669 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1670 | /* | |
1671 | * Maybe we could actually set some fields here, for now just | |
1672 | * initialise to zero to indicate no special operation. | |
1673 | */ | |
1674 | *qos_control = 0; | |
1675 | } else | |
1676 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1677 | ||
e2ebc74d JB |
1678 | nh_pos += hdrlen; |
1679 | h_pos += hdrlen; | |
1680 | ||
d0f09804 | 1681 | skb->iif = dev->ifindex; |
b0a67179 | 1682 | |
e2ebc74d | 1683 | skb->dev = local->mdev; |
68aae116 SH |
1684 | dev->stats.tx_packets++; |
1685 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1686 | |
1687 | /* Update skb pointers to various headers since this modified frame | |
1688 | * is going to go through Linux networking code that may potentially | |
1689 | * need things like pointer to IP header. */ | |
1690 | skb_set_mac_header(skb, 0); | |
1691 | skb_set_network_header(skb, nh_pos); | |
1692 | skb_set_transport_header(skb, h_pos); | |
1693 | ||
1694 | dev->trans_start = jiffies; | |
1695 | dev_queue_xmit(skb); | |
1696 | ||
1697 | return 0; | |
1698 | ||
1699 | fail: | |
1700 | if (!ret) | |
1701 | dev_kfree_skb(skb); | |
1702 | ||
1703 | return ret; | |
1704 | } | |
1705 | ||
e2ebc74d | 1706 | |
e2530083 JB |
1707 | /* |
1708 | * ieee80211_clear_tx_pending may not be called in a context where | |
1709 | * it is possible that it packets could come in again. | |
1710 | */ | |
e2ebc74d JB |
1711 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1712 | { | |
1713 | int i, j; | |
1714 | struct ieee80211_tx_stored_packet *store; | |
1715 | ||
e2530083 JB |
1716 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1717 | if (!test_bit(i, local->queues_pending)) | |
e2ebc74d JB |
1718 | continue; |
1719 | store = &local->pending_packet[i]; | |
1720 | kfree_skb(store->skb); | |
1721 | for (j = 0; j < store->num_extra_frag; j++) | |
1722 | kfree_skb(store->extra_frag[j]); | |
1723 | kfree(store->extra_frag); | |
e2530083 | 1724 | clear_bit(i, local->queues_pending); |
e2ebc74d JB |
1725 | } |
1726 | } | |
1727 | ||
e2530083 JB |
1728 | /* |
1729 | * Transmit all pending packets. Called from tasklet, locks master device | |
1730 | * TX lock so that no new packets can come in. | |
1731 | */ | |
e2ebc74d JB |
1732 | void ieee80211_tx_pending(unsigned long data) |
1733 | { | |
1734 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1735 | struct net_device *dev = local->mdev; | |
1736 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1737 | struct ieee80211_tx_data tx; |
e2530083 | 1738 | int i, ret; |
e2ebc74d JB |
1739 | |
1740 | netif_tx_lock_bh(dev); | |
e2530083 JB |
1741 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1742 | /* Check that this queue is ok */ | |
f8e79ddd TW |
1743 | if (__netif_subqueue_stopped(local->mdev, i) && |
1744 | !test_bit(i, local->queues_pending_run)) | |
e2ebc74d | 1745 | continue; |
e2530083 JB |
1746 | |
1747 | if (!test_bit(i, local->queues_pending)) { | |
f8e79ddd | 1748 | clear_bit(i, local->queues_pending_run); |
e2530083 | 1749 | ieee80211_wake_queue(&local->hw, i); |
e2ebc74d JB |
1750 | continue; |
1751 | } | |
e2530083 | 1752 | |
f8e79ddd TW |
1753 | clear_bit(i, local->queues_pending_run); |
1754 | netif_start_subqueue(local->mdev, i); | |
1755 | ||
e2ebc74d | 1756 | store = &local->pending_packet[i]; |
5cf121c3 JB |
1757 | tx.extra_frag = store->extra_frag; |
1758 | tx.num_extra_frag = store->num_extra_frag; | |
badffb72 | 1759 | tx.flags = 0; |
e2ebc74d JB |
1760 | ret = __ieee80211_tx(local, store->skb, &tx); |
1761 | if (ret) { | |
1762 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1763 | store->skb = NULL; | |
1764 | } else { | |
e2530083 JB |
1765 | clear_bit(i, local->queues_pending); |
1766 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1767 | } |
1768 | } | |
1769 | netif_tx_unlock_bh(dev); | |
e2ebc74d JB |
1770 | } |
1771 | ||
1772 | /* functions for drivers to get certain frames */ | |
1773 | ||
1774 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1775 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1776 | struct sk_buff *skb, |
1777 | struct beacon_data *beacon) | |
e2ebc74d JB |
1778 | { |
1779 | u8 *pos, *tim; | |
1780 | int aid0 = 0; | |
1781 | int i, have_bits = 0, n1, n2; | |
1782 | ||
1783 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1784 | * mode. */ | |
e2ebc74d JB |
1785 | if (atomic_read(&bss->num_sta_ps) > 0) |
1786 | /* in the hope that this is faster than | |
1787 | * checking byte-for-byte */ | |
1788 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1789 | IEEE80211_MAX_AID+1); | |
1790 | ||
1791 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1792 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1793 | else |
1794 | bss->dtim_count--; | |
1795 | ||
1796 | tim = pos = (u8 *) skb_put(skb, 6); | |
1797 | *pos++ = WLAN_EID_TIM; | |
1798 | *pos++ = 4; | |
1799 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1800 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1801 | |
1802 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1803 | aid0 = 1; | |
1804 | ||
1805 | if (have_bits) { | |
1806 | /* Find largest even number N1 so that bits numbered 1 through | |
1807 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1808 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1809 | n1 = 0; | |
1810 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1811 | if (bss->tim[i]) { | |
1812 | n1 = i & 0xfe; | |
1813 | break; | |
1814 | } | |
1815 | } | |
1816 | n2 = n1; | |
1817 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1818 | if (bss->tim[i]) { | |
1819 | n2 = i; | |
1820 | break; | |
1821 | } | |
1822 | } | |
1823 | ||
1824 | /* Bitmap control */ | |
1825 | *pos++ = n1 | aid0; | |
1826 | /* Part Virt Bitmap */ | |
1827 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1828 | ||
1829 | tim[1] = n2 - n1 + 4; | |
1830 | skb_put(skb, n2 - n1); | |
1831 | } else { | |
1832 | *pos++ = aid0; /* Bitmap control */ | |
1833 | *pos++ = 0; /* Part Virt Bitmap */ | |
1834 | } | |
e2ebc74d JB |
1835 | } |
1836 | ||
32bfd35d | 1837 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1838 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1839 | { |
1840 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 1841 | struct sk_buff *skb = NULL; |
e039fa4a | 1842 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1843 | struct net_device *bdev; |
1844 | struct ieee80211_sub_if_data *sdata = NULL; | |
1845 | struct ieee80211_if_ap *ap = NULL; | |
9d139c81 | 1846 | struct ieee80211_if_sta *ifsta = NULL; |
5dfdaf58 | 1847 | struct beacon_data *beacon; |
8318d78a | 1848 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 1849 | enum ieee80211_band band = local->hw.conf.channel->band; |
8318d78a | 1850 | |
2e92e6f2 | 1851 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1852 | |
1853 | rcu_read_lock(); | |
e2ebc74d | 1854 | |
32bfd35d JB |
1855 | sdata = vif_to_sdata(vif); |
1856 | bdev = sdata->dev; | |
e2ebc74d | 1857 | |
05c914fe | 1858 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
1859 | ap = &sdata->u.ap; |
1860 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1861 | if (ap && beacon) { |
1862 | /* | |
1863 | * headroom, head length, | |
1864 | * tail length and maximum TIM length | |
1865 | */ | |
1866 | skb = dev_alloc_skb(local->tx_headroom + | |
1867 | beacon->head_len + | |
1868 | beacon->tail_len + 256); | |
1869 | if (!skb) | |
1870 | goto out; | |
33b64eb2 | 1871 | |
902acc78 JB |
1872 | skb_reserve(skb, local->tx_headroom); |
1873 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1874 | beacon->head_len); | |
33b64eb2 | 1875 | |
d0709a65 JB |
1876 | /* |
1877 | * Not very nice, but we want to allow the driver to call | |
1878 | * ieee80211_beacon_get() as a response to the set_tim() | |
1879 | * callback. That, however, is already invoked under the | |
1880 | * sta_lock to guarantee consistent and race-free update | |
1881 | * of the tim bitmap in mac80211 and the driver. | |
1882 | */ | |
1883 | if (local->tim_in_locked_section) { | |
1884 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1885 | } else { | |
1886 | unsigned long flags; | |
1887 | ||
1888 | spin_lock_irqsave(&local->sta_lock, flags); | |
1889 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1890 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1891 | } | |
33b64eb2 | 1892 | |
902acc78 JB |
1893 | if (beacon->tail) |
1894 | memcpy(skb_put(skb, beacon->tail_len), | |
1895 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
1896 | } else |
1897 | goto out; | |
05c914fe | 1898 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
9d139c81 JB |
1899 | struct ieee80211_hdr *hdr; |
1900 | ifsta = &sdata->u.sta; | |
33b64eb2 | 1901 | |
9d139c81 JB |
1902 | if (!ifsta->probe_resp) |
1903 | goto out; | |
1904 | ||
1905 | skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC); | |
1906 | if (!skb) | |
1907 | goto out; | |
1908 | ||
1909 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
1910 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1911 | IEEE80211_STYPE_BEACON); | |
9d139c81 | 1912 | |
902acc78 | 1913 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
1914 | struct ieee80211_mgmt *mgmt; |
1915 | u8 *pos; | |
1916 | ||
902acc78 JB |
1917 | /* headroom, head length, tail length and maximum TIM length */ |
1918 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1919 | if (!skb) | |
1920 | goto out; | |
1921 | ||
1922 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1923 | mgmt = (struct ieee80211_mgmt *) | |
1924 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1925 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
1926 | mgmt->frame_control = |
1927 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
1928 | memset(mgmt->da, 0xff, ETH_ALEN); |
1929 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1930 | /* BSSID is left zeroed, wildcard value */ | |
1931 | mgmt->u.beacon.beacon_int = | |
1932 | cpu_to_le16(local->hw.conf.beacon_int); | |
1933 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1934 | ||
1935 | pos = skb_put(skb, 2); | |
1936 | *pos++ = WLAN_EID_SSID; | |
1937 | *pos++ = 0x0; | |
1938 | ||
f698d856 | 1939 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
1940 | } else { |
1941 | WARN_ON(1); | |
5dfdaf58 | 1942 | goto out; |
e2ebc74d JB |
1943 | } |
1944 | ||
e039fa4a JB |
1945 | info = IEEE80211_SKB_CB(skb); |
1946 | ||
d0f09804 JB |
1947 | skb->do_not_encrypt = 1; |
1948 | ||
e039fa4a | 1949 | info->band = band; |
e6a9854b JB |
1950 | /* |
1951 | * XXX: For now, always use the lowest rate | |
1952 | */ | |
1953 | info->control.rates[0].idx = 0; | |
1954 | info->control.rates[0].count = 1; | |
1955 | info->control.rates[1].idx = -1; | |
1956 | info->control.rates[2].idx = -1; | |
1957 | info->control.rates[3].idx = -1; | |
1958 | info->control.rates[4].idx = -1; | |
1959 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
e039fa4a JB |
1960 | |
1961 | info->control.vif = vif; | |
f591fa5d JB |
1962 | |
1963 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
1964 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1965 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e6a9854b | 1966 | out: |
5dfdaf58 | 1967 | rcu_read_unlock(); |
e2ebc74d JB |
1968 | return skb; |
1969 | } | |
1970 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1971 | ||
32bfd35d | 1972 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1973 | const void *frame, size_t frame_len, |
e039fa4a | 1974 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1975 | struct ieee80211_rts *rts) |
1976 | { | |
1977 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1978 | |
065e9605 HH |
1979 | rts->frame_control = |
1980 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
1981 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1982 | frame_txctl); | |
e2ebc74d JB |
1983 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1984 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1985 | } | |
1986 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1987 | ||
32bfd35d | 1988 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1989 | const void *frame, size_t frame_len, |
e039fa4a | 1990 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1991 | struct ieee80211_cts *cts) |
1992 | { | |
1993 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1994 | |
065e9605 HH |
1995 | cts->frame_control = |
1996 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
1997 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1998 | frame_len, frame_txctl); | |
e2ebc74d JB |
1999 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2000 | } | |
2001 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2002 | ||
2003 | struct sk_buff * | |
32bfd35d | 2004 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2005 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2006 | { |
2007 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2008 | struct sk_buff *skb = NULL; |
e2ebc74d | 2009 | struct sta_info *sta; |
5cf121c3 | 2010 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2011 | struct net_device *bdev; |
2012 | struct ieee80211_sub_if_data *sdata; | |
2013 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2014 | struct beacon_data *beacon; |
e039fa4a | 2015 | struct ieee80211_tx_info *info; |
e2ebc74d | 2016 | |
32bfd35d JB |
2017 | sdata = vif_to_sdata(vif); |
2018 | bdev = sdata->dev; | |
747cf5e9 | 2019 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2020 | |
2021 | if (!bss) | |
e2ebc74d JB |
2022 | return NULL; |
2023 | ||
5dfdaf58 JB |
2024 | rcu_read_lock(); |
2025 | beacon = rcu_dereference(bss->beacon); | |
2026 | ||
05c914fe | 2027 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2028 | goto out; |
5dfdaf58 | 2029 | |
e2ebc74d | 2030 | if (bss->dtim_count != 0) |
747cf5e9 | 2031 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2032 | |
e2ebc74d JB |
2033 | while (1) { |
2034 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2035 | if (!skb) | |
747cf5e9 | 2036 | goto out; |
e2ebc74d JB |
2037 | local->total_ps_buffered--; |
2038 | ||
2039 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2040 | struct ieee80211_hdr *hdr = | |
2041 | (struct ieee80211_hdr *) skb->data; | |
2042 | /* more buffered multicast/broadcast frames ==> set | |
2043 | * MoreData flag in IEEE 802.11 header to inform PS | |
2044 | * STAs */ | |
2045 | hdr->frame_control |= | |
2046 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2047 | } | |
2048 | ||
133b8226 | 2049 | if (!ieee80211_tx_prepare(local, &tx, skb)) |
e2ebc74d JB |
2050 | break; |
2051 | dev_kfree_skb_any(skb); | |
2052 | } | |
e039fa4a JB |
2053 | |
2054 | info = IEEE80211_SKB_CB(skb); | |
2055 | ||
e2ebc74d | 2056 | sta = tx.sta; |
5cf121c3 JB |
2057 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2058 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2059 | info->band = tx.channel->band; |
e2ebc74d | 2060 | |
97b045d6 | 2061 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2062 | skb = NULL; |
97b045d6 | 2063 | out: |
d0709a65 | 2064 | rcu_read_unlock(); |
e2ebc74d JB |
2065 | |
2066 | return skb; | |
2067 | } | |
2068 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |