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 | ||
e2ebc74d JB |
41 | #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP |
42 | static void ieee80211_dump_frame(const char *ifname, const char *title, | |
43 | const struct sk_buff *skb) | |
44 | { | |
065e9605 HH |
45 | const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
46 | unsigned int hdrlen; | |
0795af57 | 47 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
48 | |
49 | printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len); | |
50 | if (skb->len < 4) { | |
51 | printk("\n"); | |
52 | return; | |
53 | } | |
54 | ||
065e9605 | 55 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
56 | if (hdrlen > skb->len) |
57 | hdrlen = skb->len; | |
58 | if (hdrlen >= 4) | |
59 | printk(" FC=0x%04x DUR=0x%04x", | |
065e9605 | 60 | le16_to_cpu(hdr->frame_control), le16_to_cpu(hdr->duration_id)); |
e2ebc74d | 61 | if (hdrlen >= 10) |
0795af57 | 62 | printk(" A1=%s", print_mac(mac, hdr->addr1)); |
e2ebc74d | 63 | if (hdrlen >= 16) |
0795af57 | 64 | printk(" A2=%s", print_mac(mac, hdr->addr2)); |
e2ebc74d | 65 | if (hdrlen >= 24) |
0795af57 | 66 | printk(" A3=%s", print_mac(mac, hdr->addr3)); |
e2ebc74d | 67 | if (hdrlen >= 30) |
0795af57 | 68 | printk(" A4=%s", print_mac(mac, hdr->addr4)); |
e2ebc74d JB |
69 | printk("\n"); |
70 | } | |
71 | #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
72 | static inline void ieee80211_dump_frame(const char *ifname, const char *title, | |
73 | struct sk_buff *skb) | |
74 | { | |
75 | } | |
76 | #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
77 | ||
03f93c3d JB |
78 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
79 | int next_frag_len) | |
e2ebc74d JB |
80 | { |
81 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 82 | struct ieee80211_rate *txrate; |
e2ebc74d | 83 | struct ieee80211_local *local = tx->local; |
8318d78a | 84 | struct ieee80211_supported_band *sband; |
e2ebc74d | 85 | |
2e92e6f2 JB |
86 | sband = local->hw.wiphy->bands[tx->channel->band]; |
87 | txrate = &sband->bitrates[tx->rate_idx]; | |
8318d78a JB |
88 | |
89 | erp = 0; | |
90 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
91 | erp = txrate->flags & IEEE80211_RATE_ERP_G; | |
e2ebc74d JB |
92 | |
93 | /* | |
94 | * data and mgmt (except PS Poll): | |
95 | * - during CFP: 32768 | |
96 | * - during contention period: | |
97 | * if addr1 is group address: 0 | |
98 | * if more fragments = 0 and addr1 is individual address: time to | |
99 | * transmit one ACK plus SIFS | |
100 | * if more fragments = 1 and addr1 is individual address: time to | |
101 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
102 | * | |
103 | * IEEE 802.11, 9.6: | |
104 | * - control response frame (CTS or ACK) shall be transmitted using the | |
105 | * same rate as the immediately previous frame in the frame exchange | |
106 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
107 | * at the highest possible rate belonging to the PHY rates in the | |
108 | * BSSBasicRateSet | |
109 | */ | |
110 | ||
111 | if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) { | |
112 | /* TODO: These control frames are not currently sent by | |
113 | * 80211.o, but should they be implemented, this function | |
114 | * needs to be updated to support duration field calculation. | |
115 | * | |
116 | * RTS: time needed to transmit pending data/mgmt frame plus | |
117 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
118 | * CTS: duration of immediately previous RTS minus time | |
119 | * required to transmit CTS and its SIFS | |
120 | * ACK: 0 if immediately previous directed data/mgmt had | |
121 | * more=0, with more=1 duration in ACK frame is duration | |
122 | * from previous frame minus time needed to transmit ACK | |
123 | * and its SIFS | |
124 | * PS Poll: BIT(15) | BIT(14) | aid | |
125 | */ | |
126 | return 0; | |
127 | } | |
128 | ||
129 | /* data/mgmt */ | |
130 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 131 | return cpu_to_le16(32768); |
e2ebc74d JB |
132 | |
133 | if (group_addr) /* Group address as the destination - no ACK */ | |
134 | return 0; | |
135 | ||
136 | /* Individual destination address: | |
137 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
138 | * CTS and ACK frames shall be transmitted using the highest rate in | |
139 | * basic rate set that is less than or equal to the rate of the | |
140 | * immediately previous frame and that is using the same modulation | |
141 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
142 | * the highest mandatory rate of the PHY that is less than or equal to | |
143 | * the rate of the previous frame is used. | |
144 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
145 | */ | |
146 | rate = -1; | |
8318d78a JB |
147 | /* use lowest available if everything fails */ |
148 | mrate = sband->bitrates[0].bitrate; | |
149 | for (i = 0; i < sband->n_bitrates; i++) { | |
150 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 151 | |
8318d78a JB |
152 | if (r->bitrate > txrate->bitrate) |
153 | break; | |
e2ebc74d | 154 | |
8318d78a JB |
155 | if (tx->sdata->basic_rates & BIT(i)) |
156 | rate = r->bitrate; | |
157 | ||
158 | switch (sband->band) { | |
159 | case IEEE80211_BAND_2GHZ: { | |
160 | u32 flag; | |
161 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
162 | flag = IEEE80211_RATE_MANDATORY_G; | |
163 | else | |
164 | flag = IEEE80211_RATE_MANDATORY_B; | |
165 | if (r->flags & flag) | |
166 | mrate = r->bitrate; | |
167 | break; | |
168 | } | |
169 | case IEEE80211_BAND_5GHZ: | |
170 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
171 | mrate = r->bitrate; | |
172 | break; | |
173 | case IEEE80211_NUM_BANDS: | |
174 | WARN_ON(1); | |
175 | break; | |
176 | } | |
e2ebc74d JB |
177 | } |
178 | if (rate == -1) { | |
179 | /* No matching basic rate found; use highest suitable mandatory | |
180 | * PHY rate */ | |
181 | rate = mrate; | |
182 | } | |
183 | ||
184 | /* Time needed to transmit ACK | |
185 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
186 | * to closest integer */ | |
187 | ||
188 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
471b3efd | 189 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
190 | |
191 | if (next_frag_len) { | |
192 | /* Frame is fragmented: duration increases with time needed to | |
193 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
194 | dur *= 2; /* ACK + SIFS */ | |
195 | /* next fragment */ | |
196 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 197 | txrate->bitrate, erp, |
471b3efd | 198 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
199 | } |
200 | ||
03f93c3d | 201 | return cpu_to_le16(dur); |
e2ebc74d JB |
202 | } |
203 | ||
e2ebc74d JB |
204 | static int inline is_ieee80211_device(struct net_device *dev, |
205 | struct net_device *master) | |
206 | { | |
207 | return (wdev_priv(dev->ieee80211_ptr) == | |
208 | wdev_priv(master->ieee80211_ptr)); | |
209 | } | |
210 | ||
211 | /* tx handlers */ | |
212 | ||
d9e8a70f | 213 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 214 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
215 | { |
216 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
e039fa4a | 217 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2ebc74d | 218 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
e039fa4a | 219 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
220 | u32 sta_flags; |
221 | ||
e039fa4a | 222 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 223 | return TX_CONTINUE; |
58d4185e | 224 | |
ece8eddd | 225 | if (unlikely(tx->local->sta_sw_scanning) && |
e2ebc74d JB |
226 | ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || |
227 | (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ)) | |
9ae54c84 | 228 | return TX_DROP; |
e2ebc74d | 229 | |
33b64eb2 LCC |
230 | if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) |
231 | return TX_CONTINUE; | |
232 | ||
5cf121c3 | 233 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 234 | return TX_CONTINUE; |
e2ebc74d | 235 | |
07346f81 | 236 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 237 | |
5cf121c3 | 238 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 239 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
51fb61e7 | 240 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
e2ebc74d JB |
241 | (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) { |
242 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0795af57 | 243 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 244 | printk(KERN_DEBUG "%s: dropped data frame to not " |
0795af57 JP |
245 | "associated station %s\n", |
246 | tx->dev->name, print_mac(mac, hdr->addr1)); | |
e2ebc74d JB |
247 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
248 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 249 | return TX_DROP; |
e2ebc74d JB |
250 | } |
251 | } else { | |
252 | if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
253 | tx->local->num_sta == 0 && | |
51fb61e7 | 254 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) { |
e2ebc74d JB |
255 | /* |
256 | * No associated STAs - no need to send multicast | |
257 | * frames. | |
258 | */ | |
9ae54c84 | 259 | return TX_DROP; |
e2ebc74d | 260 | } |
9ae54c84 | 261 | return TX_CONTINUE; |
e2ebc74d JB |
262 | } |
263 | ||
9ae54c84 | 264 | return TX_CONTINUE; |
e2ebc74d JB |
265 | } |
266 | ||
e2ebc74d JB |
267 | /* This function is called whenever the AP is about to exceed the maximum limit |
268 | * of buffered frames for power saving STAs. This situation should not really | |
269 | * happen often during normal operation, so dropping the oldest buffered packet | |
270 | * from each queue should be OK to make some room for new frames. */ | |
271 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
272 | { | |
273 | int total = 0, purged = 0; | |
274 | struct sk_buff *skb; | |
275 | struct ieee80211_sub_if_data *sdata; | |
276 | struct sta_info *sta; | |
277 | ||
79010420 JB |
278 | /* |
279 | * virtual interfaces are protected by RCU | |
280 | */ | |
281 | rcu_read_lock(); | |
282 | ||
283 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 284 | struct ieee80211_if_ap *ap; |
3e122be0 | 285 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP) |
e2ebc74d JB |
286 | continue; |
287 | ap = &sdata->u.ap; | |
288 | skb = skb_dequeue(&ap->ps_bc_buf); | |
289 | if (skb) { | |
290 | purged++; | |
291 | dev_kfree_skb(skb); | |
292 | } | |
293 | total += skb_queue_len(&ap->ps_bc_buf); | |
294 | } | |
e2ebc74d | 295 | |
d0709a65 | 296 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
297 | skb = skb_dequeue(&sta->ps_tx_buf); |
298 | if (skb) { | |
299 | purged++; | |
300 | dev_kfree_skb(skb); | |
301 | } | |
302 | total += skb_queue_len(&sta->ps_tx_buf); | |
303 | } | |
d0709a65 JB |
304 | |
305 | rcu_read_unlock(); | |
e2ebc74d JB |
306 | |
307 | local->total_ps_buffered = total; | |
54223995 | 308 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 309 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 310 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 311 | #endif |
e2ebc74d JB |
312 | } |
313 | ||
9ae54c84 | 314 | static ieee80211_tx_result |
5cf121c3 | 315 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 316 | { |
e039fa4a JB |
317 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
318 | ||
7d54d0dd JB |
319 | /* |
320 | * broadcast/multicast frame | |
321 | * | |
322 | * If any of the associated stations is in power save mode, | |
323 | * the frame is buffered to be sent after DTIM beacon frame. | |
324 | * This is done either by the hardware or us. | |
325 | */ | |
326 | ||
3e122be0 JB |
327 | /* powersaving STAs only in AP/VLAN mode */ |
328 | if (!tx->sdata->bss) | |
329 | return TX_CONTINUE; | |
330 | ||
331 | /* no buffering for ordered frames */ | |
332 | if (tx->fc & IEEE80211_FCTL_ORDER) | |
9ae54c84 | 333 | return TX_CONTINUE; |
7d54d0dd JB |
334 | |
335 | /* no stations in PS mode */ | |
336 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 337 | return TX_CONTINUE; |
7d54d0dd JB |
338 | |
339 | /* buffered in mac80211 */ | |
340 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
341 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
342 | purge_old_ps_buffers(tx->local); | |
343 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
344 | AP_MAX_BC_BUFFER) { | |
54223995 | 345 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d JB |
346 | if (net_ratelimit()) { |
347 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
348 | "dropping the oldest frame\n", | |
349 | tx->dev->name); | |
350 | } | |
f4ea83dd | 351 | #endif |
e2ebc74d JB |
352 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
353 | } else | |
354 | tx->local->total_ps_buffered++; | |
355 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 356 | return TX_QUEUED; |
e2ebc74d JB |
357 | } |
358 | ||
7d54d0dd | 359 | /* buffered in hardware */ |
e039fa4a | 360 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 361 | |
9ae54c84 | 362 | return TX_CONTINUE; |
e2ebc74d JB |
363 | } |
364 | ||
9ae54c84 | 365 | static ieee80211_tx_result |
5cf121c3 | 366 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
367 | { |
368 | struct sta_info *sta = tx->sta; | |
e039fa4a | 369 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
07346f81 | 370 | u32 staflags; |
0795af57 | 371 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
372 | |
373 | if (unlikely(!sta || | |
374 | ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && | |
375 | (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) | |
9ae54c84 | 376 | return TX_CONTINUE; |
e2ebc74d | 377 | |
07346f81 JB |
378 | staflags = get_sta_flags(sta); |
379 | ||
380 | if (unlikely((staflags & WLAN_STA_PS) && | |
381 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 382 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 | 383 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 384 | "before %d)\n", |
0795af57 | 385 | print_mac(mac, sta->addr), sta->aid, |
e2ebc74d JB |
386 | skb_queue_len(&sta->ps_tx_buf)); |
387 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
388 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
389 | purge_old_ps_buffers(tx->local); | |
390 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
391 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 392 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 393 | if (net_ratelimit()) { |
0795af57 | 394 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 395 | "buffer full - dropping oldest frame\n", |
0795af57 | 396 | tx->dev->name, print_mac(mac, sta->addr)); |
e2ebc74d | 397 | } |
f4ea83dd | 398 | #endif |
e2ebc74d JB |
399 | dev_kfree_skb(old); |
400 | } else | |
401 | tx->local->total_ps_buffered++; | |
004c872e | 402 | |
e2ebc74d | 403 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
404 | if (skb_queue_empty(&sta->ps_tx_buf)) |
405 | sta_info_set_tim_bit(sta); | |
406 | ||
e039fa4a | 407 | info->control.jiffies = jiffies; |
e2ebc74d | 408 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 409 | return TX_QUEUED; |
e2ebc74d JB |
410 | } |
411 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 412 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0795af57 | 413 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 414 | "set -> send frame\n", tx->dev->name, |
0795af57 | 415 | print_mac(mac, sta->addr)); |
e2ebc74d JB |
416 | } |
417 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 418 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 419 | |
9ae54c84 | 420 | return TX_CONTINUE; |
e2ebc74d JB |
421 | } |
422 | ||
d9e8a70f | 423 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 424 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 425 | { |
5cf121c3 | 426 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 427 | return TX_CONTINUE; |
e2ebc74d | 428 | |
5cf121c3 | 429 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
430 | return ieee80211_tx_h_unicast_ps_buf(tx); |
431 | else | |
432 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
433 | } | |
434 | ||
d9e8a70f | 435 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 436 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 437 | { |
d4e46a3d | 438 | struct ieee80211_key *key; |
e039fa4a | 439 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
176e4f84 | 440 | u16 fc = tx->fc; |
d4e46a3d | 441 | |
d0f09804 | 442 | if (unlikely(tx->skb->do_not_encrypt)) |
e2ebc74d | 443 | tx->key = NULL; |
d4e46a3d JB |
444 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
445 | tx->key = key; | |
446 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
447 | tx->key = key; | |
e2ebc74d | 448 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 449 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e039fa4a | 450 | !(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
e2ebc74d | 451 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 452 | return TX_DROP; |
176e4f84 | 453 | } else |
e2ebc74d JB |
454 | tx->key = NULL; |
455 | ||
456 | if (tx->key) { | |
176e4f84 JB |
457 | u16 ftype, stype; |
458 | ||
e2ebc74d | 459 | tx->key->tx_rx_count++; |
011bfcc4 | 460 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
461 | |
462 | switch (tx->key->conf.alg) { | |
463 | case ALG_WEP: | |
464 | ftype = fc & IEEE80211_FCTL_FTYPE; | |
465 | stype = fc & IEEE80211_FCTL_STYPE; | |
466 | ||
467 | if (ftype == IEEE80211_FTYPE_MGMT && | |
468 | stype == IEEE80211_STYPE_AUTH) | |
469 | break; | |
470 | case ALG_TKIP: | |
471 | case ALG_CCMP: | |
472 | if (!WLAN_FC_DATA_PRESENT(fc)) | |
473 | tx->key = NULL; | |
474 | break; | |
475 | } | |
e2ebc74d JB |
476 | } |
477 | ||
176e4f84 | 478 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
d0f09804 | 479 | tx->skb->do_not_encrypt = 1; |
176e4f84 | 480 | |
9ae54c84 | 481 | return TX_CONTINUE; |
e2ebc74d JB |
482 | } |
483 | ||
d9e8a70f | 484 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 485 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 486 | { |
1abbe498 | 487 | struct rate_selection rsel; |
8318d78a | 488 | struct ieee80211_supported_band *sband; |
e039fa4a | 489 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
8318d78a | 490 | |
2e92e6f2 | 491 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d | 492 | |
2e92e6f2 | 493 | if (likely(tx->rate_idx < 0)) { |
8318d78a | 494 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
2e92e6f2 JB |
495 | tx->rate_idx = rsel.rate_idx; |
496 | if (unlikely(rsel.probe_idx >= 0)) { | |
e039fa4a | 497 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
5cf121c3 | 498 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e039fa4a | 499 | info->control.alt_retry_rate_idx = tx->rate_idx; |
2e92e6f2 | 500 | tx->rate_idx = rsel.probe_idx; |
58d4185e | 501 | } else |
e039fa4a | 502 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 503 | |
2e92e6f2 | 504 | if (unlikely(tx->rate_idx < 0)) |
9ae54c84 | 505 | return TX_DROP; |
58d4185e | 506 | } else |
e039fa4a | 507 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 508 | |
8318d78a | 509 | if (tx->sdata->bss_conf.use_cts_prot && |
2e92e6f2 JB |
510 | (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) { |
511 | tx->last_frag_rate_idx = tx->rate_idx; | |
512 | if (rsel.probe_idx >= 0) | |
5cf121c3 | 513 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 514 | else |
5cf121c3 | 515 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
2e92e6f2 | 516 | tx->rate_idx = rsel.nonerp_idx; |
e039fa4a JB |
517 | info->tx_rate_idx = rsel.nonerp_idx; |
518 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 519 | } else { |
2e92e6f2 | 520 | tx->last_frag_rate_idx = tx->rate_idx; |
e039fa4a | 521 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 522 | } |
e039fa4a | 523 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 524 | |
9ae54c84 | 525 | return TX_CONTINUE; |
e2ebc74d JB |
526 | } |
527 | ||
d9e8a70f | 528 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 529 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d | 530 | { |
065e9605 | 531 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 532 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
2e92e6f2 JB |
533 | struct ieee80211_supported_band *sband; |
534 | ||
535 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
e2ebc74d | 536 | |
e039fa4a JB |
537 | if (tx->sta) |
538 | info->control.aid = tx->sta->aid; | |
539 | ||
540 | if (!info->control.retry_limit) { | |
58d4185e | 541 | if (!is_multicast_ether_addr(hdr->addr1)) { |
e039fa4a JB |
542 | int len = min_t(int, tx->skb->len + FCS_LEN, |
543 | tx->local->fragmentation_threshold); | |
544 | if (len > tx->local->rts_threshold | |
58d4185e | 545 | && tx->local->rts_threshold < |
e039fa4a JB |
546 | IEEE80211_MAX_RTS_THRESHOLD) { |
547 | info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS; | |
548 | info->flags |= | |
549 | IEEE80211_TX_CTL_LONG_RETRY_LIMIT; | |
550 | info->control.retry_limit = | |
58d4185e JB |
551 | tx->local->long_retry_limit; |
552 | } else { | |
e039fa4a | 553 | info->control.retry_limit = |
58d4185e JB |
554 | tx->local->short_retry_limit; |
555 | } | |
e2ebc74d | 556 | } else { |
e039fa4a | 557 | info->control.retry_limit = 1; |
e2ebc74d | 558 | } |
e2ebc74d JB |
559 | } |
560 | ||
5cf121c3 | 561 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
562 | /* Do not use multiple retry rates when sending fragmented |
563 | * frames. | |
564 | * TODO: The last fragment could still use multiple retry | |
565 | * rates. */ | |
e039fa4a | 566 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
567 | } |
568 | ||
569 | /* Use CTS protection for unicast frames sent using extended rates if | |
570 | * there are associated non-ERP stations and RTS/CTS is not configured | |
571 | * for the frame. */ | |
8318d78a | 572 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
2e92e6f2 | 573 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) && |
5cf121c3 | 574 | (tx->flags & IEEE80211_TX_UNICAST) && |
471b3efd | 575 | tx->sdata->bss_conf.use_cts_prot && |
e039fa4a JB |
576 | !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)) |
577 | info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT; | |
e2ebc74d | 578 | |
7e9ed188 DD |
579 | /* Transmit data frames using short preambles if the driver supports |
580 | * short preambles at the selected rate and short preambles are | |
581 | * available on the network at the current point in time. */ | |
065e9605 | 582 | if (ieee80211_is_data(hdr->frame_control) && |
2e92e6f2 | 583 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 584 | tx->sdata->bss_conf.use_short_preamble && |
07346f81 | 585 | (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) { |
e039fa4a | 586 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; |
7e9ed188 DD |
587 | } |
588 | ||
e039fa4a JB |
589 | if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) || |
590 | (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) { | |
2e92e6f2 JB |
591 | struct ieee80211_rate *rate; |
592 | s8 baserate = -1; | |
8318d78a JB |
593 | int idx; |
594 | ||
e2ebc74d | 595 | /* Do not use multiple retry rates when using RTS/CTS */ |
e039fa4a | 596 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
597 | |
598 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
2e92e6f2 | 599 | rate = &sband->bitrates[tx->rate_idx]; |
8318d78a JB |
600 | |
601 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
602 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
603 | continue; | |
604 | if (tx->sdata->basic_rates & BIT(idx) && | |
2e92e6f2 JB |
605 | (baserate < 0 || |
606 | (sband->bitrates[baserate].bitrate | |
607 | < sband->bitrates[idx].bitrate))) | |
608 | baserate = idx; | |
8318d78a | 609 | } |
e2ebc74d | 610 | |
2e92e6f2 | 611 | if (baserate >= 0) |
e039fa4a | 612 | info->control.rts_cts_rate_idx = baserate; |
8318d78a | 613 | else |
e039fa4a | 614 | info->control.rts_cts_rate_idx = 0; |
e2ebc74d JB |
615 | } |
616 | ||
e2454948 | 617 | if (tx->sta) |
e039fa4a | 618 | info->control.aid = tx->sta->aid; |
e2454948 JB |
619 | |
620 | return TX_CONTINUE; | |
621 | } | |
622 | ||
f591fa5d JB |
623 | static ieee80211_tx_result debug_noinline |
624 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
625 | { | |
626 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
627 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
628 | u16 *seq; | |
629 | u8 *qc; | |
630 | int tid; | |
631 | ||
632 | /* only for injected frames */ | |
633 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) | |
634 | return TX_CONTINUE; | |
635 | ||
636 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
637 | return TX_CONTINUE; | |
638 | ||
639 | if (!ieee80211_is_data_qos(hdr->frame_control)) { | |
640 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
641 | return TX_CONTINUE; | |
642 | } | |
643 | ||
644 | /* | |
645 | * This should be true for injected/management frames only, for | |
646 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
647 | * above since they are not QoS-data frames. | |
648 | */ | |
649 | if (!tx->sta) | |
650 | return TX_CONTINUE; | |
651 | ||
652 | /* include per-STA, per-TID sequence counter */ | |
653 | ||
654 | qc = ieee80211_get_qos_ctl(hdr); | |
655 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
656 | seq = &tx->sta->tid_seq[tid]; | |
657 | ||
658 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
659 | ||
660 | /* Increase the sequence number. */ | |
661 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
662 | ||
663 | return TX_CONTINUE; | |
664 | } | |
665 | ||
d9e8a70f | 666 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
667 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
668 | { | |
065e9605 | 669 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2454948 JB |
670 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; |
671 | struct sk_buff **frags, *first, *frag; | |
672 | int i; | |
673 | u16 seq; | |
674 | u8 *pos; | |
675 | int frag_threshold = tx->local->fragmentation_threshold; | |
676 | ||
677 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
678 | return TX_CONTINUE; | |
679 | ||
eefce91a JB |
680 | /* |
681 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
682 | * This scenario is handled in __ieee80211_tx_prepare but extra |
683 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a JB |
684 | */ |
685 | if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU || | |
e2530083 JB |
686 | skb_get_queue_mapping(tx->skb) >= |
687 | ieee80211_num_regular_queues(&tx->local->hw))) | |
eefce91a JB |
688 | return TX_DROP; |
689 | ||
e2454948 JB |
690 | first = tx->skb; |
691 | ||
065e9605 | 692 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 JB |
693 | payload_len = first->len - hdrlen; |
694 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
695 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
696 | ||
697 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
698 | if (!frags) | |
699 | goto fail; | |
700 | ||
701 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
702 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
703 | pos = first->data + hdrlen + per_fragm; | |
704 | left = payload_len - per_fragm; | |
705 | for (i = 0; i < num_fragm - 1; i++) { | |
706 | struct ieee80211_hdr *fhdr; | |
707 | size_t copylen; | |
708 | ||
709 | if (left <= 0) | |
710 | goto fail; | |
711 | ||
712 | /* reserve enough extra head and tail room for possible | |
713 | * encryption */ | |
714 | frag = frags[i] = | |
715 | dev_alloc_skb(tx->local->tx_headroom + | |
716 | frag_threshold + | |
717 | IEEE80211_ENCRYPT_HEADROOM + | |
718 | IEEE80211_ENCRYPT_TAILROOM); | |
719 | if (!frag) | |
720 | goto fail; | |
721 | /* Make sure that all fragments use the same priority so | |
722 | * that they end up using the same TX queue */ | |
723 | frag->priority = first->priority; | |
724 | skb_reserve(frag, tx->local->tx_headroom + | |
725 | IEEE80211_ENCRYPT_HEADROOM); | |
726 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
727 | memcpy(fhdr, first->data, hdrlen); | |
728 | if (i == num_fragm - 2) | |
729 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
730 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
731 | copylen = left > per_fragm ? per_fragm : left; | |
732 | memcpy(skb_put(frag, copylen), pos, copylen); | |
03f93c3d JB |
733 | memcpy(frag->cb, first->cb, sizeof(frag->cb)); |
734 | skb_copy_queue_mapping(frag, first); | |
d0f09804 | 735 | frag->do_not_encrypt = first->do_not_encrypt; |
e2454948 JB |
736 | |
737 | pos += copylen; | |
738 | left -= copylen; | |
e2ebc74d | 739 | } |
e2454948 JB |
740 | skb_trim(first, hdrlen + per_fragm); |
741 | ||
742 | tx->num_extra_frag = num_fragm - 1; | |
743 | tx->extra_frag = frags; | |
e2ebc74d | 744 | |
9ae54c84 | 745 | return TX_CONTINUE; |
e2454948 JB |
746 | |
747 | fail: | |
e2454948 JB |
748 | if (frags) { |
749 | for (i = 0; i < num_fragm - 1; i++) | |
750 | if (frags[i]) | |
751 | dev_kfree_skb(frags[i]); | |
752 | kfree(frags); | |
753 | } | |
754 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
755 | return TX_DROP; | |
e2ebc74d JB |
756 | } |
757 | ||
d9e8a70f | 758 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
759 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
760 | { | |
761 | if (!tx->key) | |
762 | return TX_CONTINUE; | |
763 | ||
764 | switch (tx->key->conf.alg) { | |
765 | case ALG_WEP: | |
766 | return ieee80211_crypto_wep_encrypt(tx); | |
767 | case ALG_TKIP: | |
768 | return ieee80211_crypto_tkip_encrypt(tx); | |
769 | case ALG_CCMP: | |
770 | return ieee80211_crypto_ccmp_encrypt(tx); | |
771 | } | |
772 | ||
773 | /* not reached */ | |
774 | WARN_ON(1); | |
775 | return TX_DROP; | |
776 | } | |
777 | ||
d9e8a70f | 778 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
779 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
780 | { | |
781 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
782 | int next_len, i; | |
783 | int group_addr = is_multicast_ether_addr(hdr->addr1); | |
784 | ||
785 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) { | |
786 | hdr->duration_id = ieee80211_duration(tx, group_addr, 0); | |
787 | return TX_CONTINUE; | |
788 | } | |
789 | ||
790 | hdr->duration_id = ieee80211_duration(tx, group_addr, | |
791 | tx->extra_frag[0]->len); | |
792 | ||
793 | for (i = 0; i < tx->num_extra_frag; i++) { | |
794 | if (i + 1 < tx->num_extra_frag) { | |
795 | next_len = tx->extra_frag[i + 1]->len; | |
796 | } else { | |
797 | next_len = 0; | |
798 | tx->rate_idx = tx->last_frag_rate_idx; | |
799 | } | |
800 | ||
801 | hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data; | |
802 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); | |
803 | } | |
804 | ||
805 | return TX_CONTINUE; | |
806 | } | |
807 | ||
d9e8a70f | 808 | static ieee80211_tx_result debug_noinline |
e2454948 | 809 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 810 | { |
9e72ebd6 | 811 | int i; |
e2ebc74d | 812 | |
9e72ebd6 JB |
813 | if (!tx->sta) |
814 | return TX_CONTINUE; | |
e2ebc74d | 815 | |
9e72ebd6 JB |
816 | tx->sta->tx_packets++; |
817 | tx->sta->tx_fragments++; | |
818 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 819 | if (tx->extra_frag) { |
9e72ebd6 JB |
820 | tx->sta->tx_fragments += tx->num_extra_frag; |
821 | for (i = 0; i < tx->num_extra_frag; i++) | |
822 | tx->sta->tx_bytes += tx->extra_frag[i]->len; | |
e2454948 JB |
823 | } |
824 | ||
9ae54c84 | 825 | return TX_CONTINUE; |
e2ebc74d JB |
826 | } |
827 | ||
e2ebc74d | 828 | |
e2ebc74d JB |
829 | /* actual transmit path */ |
830 | ||
831 | /* | |
832 | * deal with packet injection down monitor interface | |
833 | * with Radiotap Header -- only called for monitor mode interface | |
834 | */ | |
9ae54c84 | 835 | static ieee80211_tx_result |
5cf121c3 | 836 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 837 | struct sk_buff *skb) |
e2ebc74d JB |
838 | { |
839 | /* | |
840 | * this is the moment to interpret and discard the radiotap header that | |
841 | * must be at the start of the packet injected in Monitor mode | |
842 | * | |
843 | * Need to take some care with endian-ness since radiotap | |
844 | * args are little-endian | |
845 | */ | |
846 | ||
847 | struct ieee80211_radiotap_iterator iterator; | |
848 | struct ieee80211_radiotap_header *rthdr = | |
849 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 850 | struct ieee80211_supported_band *sband; |
e2ebc74d | 851 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
e039fa4a | 852 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 853 | |
2e92e6f2 | 854 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 855 | |
d0f09804 | 856 | skb->do_not_encrypt = 1; |
e039fa4a | 857 | info->flags |= IEEE80211_TX_CTL_INJECTED; |
5cf121c3 | 858 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
859 | |
860 | /* | |
861 | * for every radiotap entry that is present | |
862 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
863 | * entries present, or -EINVAL on error) | |
864 | */ | |
865 | ||
866 | while (!ret) { | |
867 | int i, target_rate; | |
868 | ||
869 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
870 | ||
871 | if (ret) | |
872 | continue; | |
873 | ||
874 | /* see if this argument is something we can use */ | |
875 | switch (iterator.this_arg_index) { | |
876 | /* | |
877 | * You must take care when dereferencing iterator.this_arg | |
878 | * for multibyte types... the pointer is not aligned. Use | |
879 | * get_unaligned((type *)iterator.this_arg) to dereference | |
880 | * iterator.this_arg for type "type" safely on all arches. | |
881 | */ | |
882 | case IEEE80211_RADIOTAP_RATE: | |
883 | /* | |
884 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
885 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
886 | */ | |
887 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
888 | for (i = 0; i < sband->n_bitrates; i++) { |
889 | struct ieee80211_rate *r; | |
e2ebc74d | 890 | |
8318d78a JB |
891 | r = &sband->bitrates[i]; |
892 | ||
893 | if (r->bitrate == target_rate) { | |
2e92e6f2 | 894 | tx->rate_idx = i; |
58d4185e JB |
895 | break; |
896 | } | |
e2ebc74d JB |
897 | } |
898 | break; | |
899 | ||
900 | case IEEE80211_RADIOTAP_ANTENNA: | |
901 | /* | |
902 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
903 | * 1st ant | |
904 | */ | |
e039fa4a | 905 | info->antenna_sel_tx = (*iterator.this_arg) + 1; |
e2ebc74d JB |
906 | break; |
907 | ||
8318d78a | 908 | #if 0 |
e2ebc74d JB |
909 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
910 | control->power_level = *iterator.this_arg; | |
911 | break; | |
8318d78a | 912 | #endif |
e2ebc74d JB |
913 | |
914 | case IEEE80211_RADIOTAP_FLAGS: | |
915 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
916 | /* | |
917 | * this indicates that the skb we have been | |
918 | * handed has the 32-bit FCS CRC at the end... | |
919 | * we should react to that by snipping it off | |
920 | * because it will be recomputed and added | |
921 | * on transmission | |
922 | */ | |
923 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 924 | return TX_DROP; |
e2ebc74d JB |
925 | |
926 | skb_trim(skb, skb->len - FCS_LEN); | |
927 | } | |
58d4185e | 928 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 929 | tx->skb->do_not_encrypt = 0; |
58d4185e | 930 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 931 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
932 | break; |
933 | ||
58d4185e JB |
934 | /* |
935 | * Please update the file | |
936 | * Documentation/networking/mac80211-injection.txt | |
937 | * when parsing new fields here. | |
938 | */ | |
939 | ||
e2ebc74d JB |
940 | default: |
941 | break; | |
942 | } | |
943 | } | |
944 | ||
945 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 946 | return TX_DROP; |
e2ebc74d JB |
947 | |
948 | /* | |
949 | * remove the radiotap header | |
950 | * iterator->max_length was sanity-checked against | |
951 | * skb->len by iterator init | |
952 | */ | |
953 | skb_pull(skb, iterator.max_length); | |
954 | ||
9ae54c84 | 955 | return TX_CONTINUE; |
e2ebc74d JB |
956 | } |
957 | ||
58d4185e JB |
958 | /* |
959 | * initialises @tx | |
960 | */ | |
9ae54c84 | 961 | static ieee80211_tx_result |
5cf121c3 | 962 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 963 | struct sk_buff *skb, |
e039fa4a | 964 | struct net_device *dev) |
e2ebc74d JB |
965 | { |
966 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 967 | struct ieee80211_hdr *hdr; |
e2ebc74d | 968 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 969 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
970 | |
971 | int hdrlen; | |
972 | ||
973 | memset(tx, 0, sizeof(*tx)); | |
974 | tx->skb = skb; | |
975 | tx->dev = dev; /* use original interface */ | |
976 | tx->local = local; | |
977 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 978 | tx->channel = local->hw.conf.channel; |
5854a32e JB |
979 | tx->rate_idx = -1; |
980 | tx->last_frag_rate_idx = -1; | |
e2ebc74d | 981 | /* |
58d4185e JB |
982 | * Set this flag (used below to indicate "automatic fragmentation"), |
983 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 984 | */ |
5cf121c3 | 985 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
986 | |
987 | /* process and remove the injection radiotap header */ | |
988 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
51fb61e7 | 989 | if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { |
9ae54c84 JB |
990 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
991 | return TX_DROP; | |
58d4185e | 992 | |
e2ebc74d | 993 | /* |
58d4185e JB |
994 | * __ieee80211_parse_tx_radiotap has now removed |
995 | * the radiotap header that was present and pre-filled | |
996 | * 'tx' with tx control information. | |
e2ebc74d | 997 | */ |
e2ebc74d JB |
998 | } |
999 | ||
58d4185e JB |
1000 | hdr = (struct ieee80211_hdr *) skb->data; |
1001 | ||
24338793 | 1002 | tx->sta = sta_info_get(local, hdr->addr1); |
1003 | tx->fc = le16_to_cpu(hdr->frame_control); | |
58d4185e | 1004 | |
badffb72 | 1005 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1006 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1007 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1008 | } else { |
5cf121c3 | 1009 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 1010 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1011 | } |
58d4185e | 1012 | |
5cf121c3 JB |
1013 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1014 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 1015 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 RR |
1016 | !local->ops->set_frag_threshold && |
1017 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) | |
5cf121c3 | 1018 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1019 | else |
5cf121c3 | 1020 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1021 | } |
1022 | ||
e2ebc74d | 1023 | if (!tx->sta) |
e039fa4a | 1024 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1025 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1026 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1027 | |
e2ebc74d JB |
1028 | hdrlen = ieee80211_get_hdrlen(tx->fc); |
1029 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { | |
1030 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1031 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1032 | } | |
e039fa4a | 1033 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1034 | |
9ae54c84 | 1035 | return TX_CONTINUE; |
e2ebc74d JB |
1036 | } |
1037 | ||
32bfd35d | 1038 | /* |
58d4185e JB |
1039 | * NB: @tx is uninitialised when passed in here |
1040 | */ | |
5cf121c3 | 1041 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e | 1042 | struct sk_buff *skb, |
e039fa4a | 1043 | struct net_device *mdev) |
e2ebc74d | 1044 | { |
e2ebc74d JB |
1045 | struct net_device *dev; |
1046 | ||
d0f09804 | 1047 | dev = dev_get_by_index(&init_net, skb->iif); |
e2ebc74d JB |
1048 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1049 | dev_put(dev); | |
1050 | dev = NULL; | |
1051 | } | |
1052 | if (unlikely(!dev)) | |
1053 | return -ENODEV; | |
58d4185e | 1054 | /* initialises tx with control */ |
e039fa4a | 1055 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1056 | dev_put(dev); |
e2ebc74d JB |
1057 | return 0; |
1058 | } | |
1059 | ||
1060 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1061 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1062 | { |
f8e79ddd | 1063 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1064 | int ret, i; |
1065 | ||
e2ebc74d | 1066 | if (skb) { |
f8e79ddd TW |
1067 | if (netif_subqueue_stopped(local->mdev, skb)) |
1068 | return IEEE80211_TX_AGAIN; | |
1069 | info = IEEE80211_SKB_CB(skb); | |
1070 | ||
dd1cd4c6 JB |
1071 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
1072 | "TX to low-level driver", skb); | |
e039fa4a | 1073 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1074 | if (ret) |
1075 | return IEEE80211_TX_AGAIN; | |
1076 | local->mdev->trans_start = jiffies; | |
1077 | ieee80211_led_tx(local, 1); | |
1078 | } | |
5cf121c3 | 1079 | if (tx->extra_frag) { |
5cf121c3 JB |
1080 | for (i = 0; i < tx->num_extra_frag; i++) { |
1081 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1082 | continue; |
e039fa4a JB |
1083 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
1084 | info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS | | |
1085 | IEEE80211_TX_CTL_USE_CTS_PROTECT | | |
1086 | IEEE80211_TX_CTL_CLEAR_PS_FILT | | |
1087 | IEEE80211_TX_CTL_FIRST_FRAGMENT); | |
e2530083 JB |
1088 | if (netif_subqueue_stopped(local->mdev, |
1089 | tx->extra_frag[i])) | |
e2ebc74d | 1090 | return IEEE80211_TX_FRAG_AGAIN; |
5cf121c3 | 1091 | if (i == tx->num_extra_frag) { |
e039fa4a | 1092 | info->tx_rate_idx = tx->last_frag_rate_idx; |
8318d78a | 1093 | |
5cf121c3 | 1094 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e039fa4a JB |
1095 | info->flags |= |
1096 | IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 1097 | else |
e039fa4a JB |
1098 | info->flags &= |
1099 | ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d JB |
1100 | } |
1101 | ||
dd1cd4c6 | 1102 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
e2ebc74d | 1103 | "TX to low-level driver", |
5cf121c3 | 1104 | tx->extra_frag[i]); |
e2ebc74d | 1105 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1106 | tx->extra_frag[i]); |
e2ebc74d JB |
1107 | if (ret) |
1108 | return IEEE80211_TX_FRAG_AGAIN; | |
1109 | local->mdev->trans_start = jiffies; | |
1110 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1111 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1112 | } |
5cf121c3 JB |
1113 | kfree(tx->extra_frag); |
1114 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1115 | } |
1116 | return IEEE80211_TX_OK; | |
1117 | } | |
1118 | ||
97b045d6 JB |
1119 | /* |
1120 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1121 | * frame was dropped or queued. | |
1122 | */ | |
1123 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1124 | { | |
97b045d6 | 1125 | struct sk_buff *skb = tx->skb; |
97b045d6 JB |
1126 | ieee80211_tx_result res = TX_DROP; |
1127 | int i; | |
1128 | ||
d9e8a70f JB |
1129 | #define CALL_TXH(txh) \ |
1130 | res = txh(tx); \ | |
1131 | if (res != TX_CONTINUE) \ | |
1132 | goto txh_done; | |
1133 | ||
1134 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1135 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1136 | CALL_TXH(ieee80211_tx_h_select_key) | |
1137 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1138 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1139 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1140 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1141 | CALL_TXH(ieee80211_tx_h_fragment) |
1142 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1143 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1144 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1145 | CALL_TXH(ieee80211_tx_h_stats) | |
1146 | #undef CALL_TXH | |
97b045d6 | 1147 | |
d9e8a70f | 1148 | txh_done: |
97b045d6 | 1149 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1150 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
97b045d6 JB |
1151 | dev_kfree_skb(skb); |
1152 | for (i = 0; i < tx->num_extra_frag; i++) | |
1153 | if (tx->extra_frag[i]) | |
1154 | dev_kfree_skb(tx->extra_frag[i]); | |
1155 | kfree(tx->extra_frag); | |
1156 | return -1; | |
1157 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1158 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1159 | return -1; |
1160 | } | |
1161 | ||
1162 | return 0; | |
1163 | } | |
1164 | ||
e039fa4a | 1165 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1166 | { |
1167 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1168 | struct sta_info *sta; | |
5cf121c3 | 1169 | struct ieee80211_tx_data tx; |
97b045d6 | 1170 | ieee80211_tx_result res_prepare; |
e039fa4a | 1171 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1172 | int ret, i; |
e2530083 | 1173 | u16 queue; |
e2ebc74d | 1174 | |
e2530083 JB |
1175 | queue = skb_get_queue_mapping(skb); |
1176 | ||
1177 | WARN_ON(test_bit(queue, local->queues_pending)); | |
e2ebc74d JB |
1178 | |
1179 | if (unlikely(skb->len < 10)) { | |
1180 | dev_kfree_skb(skb); | |
1181 | return 0; | |
1182 | } | |
1183 | ||
d0709a65 JB |
1184 | rcu_read_lock(); |
1185 | ||
58d4185e | 1186 | /* initialises tx */ |
e039fa4a | 1187 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1188 | |
9ae54c84 | 1189 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1190 | dev_kfree_skb(skb); |
d0709a65 | 1191 | rcu_read_unlock(); |
e2ebc74d JB |
1192 | return 0; |
1193 | } | |
1194 | ||
1195 | sta = tx.sta; | |
5cf121c3 | 1196 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1197 | info->band = tx.channel->band; |
e2ebc74d | 1198 | |
97b045d6 JB |
1199 | if (invoke_tx_handlers(&tx)) |
1200 | goto out; | |
e2ebc74d | 1201 | |
e2ebc74d JB |
1202 | retry: |
1203 | ret = __ieee80211_tx(local, skb, &tx); | |
1204 | if (ret) { | |
eefce91a JB |
1205 | struct ieee80211_tx_stored_packet *store; |
1206 | ||
1207 | /* | |
1208 | * Since there are no fragmented frames on A-MPDU | |
1209 | * queues, there's no reason for a driver to reject | |
1210 | * a frame there, warn and drop it. | |
1211 | */ | |
e2530083 | 1212 | if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw))) |
eefce91a JB |
1213 | goto drop; |
1214 | ||
1215 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1216 | |
1217 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1218 | skb = NULL; | |
f8e79ddd | 1219 | |
e2530083 | 1220 | set_bit(queue, local->queues_pending); |
e2ebc74d | 1221 | smp_mb(); |
e2530083 JB |
1222 | /* |
1223 | * When the driver gets out of buffers during sending of | |
1224 | * fragments and calls ieee80211_stop_queue, the netif | |
1225 | * subqueue is stopped. There is, however, a small window | |
1226 | * in which the PENDING bit is not yet set. If a buffer | |
e2ebc74d JB |
1227 | * gets available in that window (i.e. driver calls |
1228 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
e2530083 | 1229 | * called with the PENDING bit still set. Prevent this by |
e2ebc74d | 1230 | * continuing transmitting here when that situation is |
e2530083 JB |
1231 | * possible to have happened. |
1232 | */ | |
1233 | if (!__netif_subqueue_stopped(local->mdev, queue)) { | |
1234 | clear_bit(queue, local->queues_pending); | |
e2ebc74d JB |
1235 | goto retry; |
1236 | } | |
e2ebc74d | 1237 | store->skb = skb; |
5cf121c3 JB |
1238 | store->extra_frag = tx.extra_frag; |
1239 | store->num_extra_frag = tx.num_extra_frag; | |
2e92e6f2 | 1240 | store->last_frag_rate_idx = tx.last_frag_rate_idx; |
badffb72 | 1241 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1242 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1243 | } |
97b045d6 | 1244 | out: |
d4e46a3d | 1245 | rcu_read_unlock(); |
e2ebc74d JB |
1246 | return 0; |
1247 | ||
1248 | drop: | |
1249 | if (skb) | |
1250 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1251 | for (i = 0; i < tx.num_extra_frag; i++) |
1252 | if (tx.extra_frag[i]) | |
1253 | dev_kfree_skb(tx.extra_frag[i]); | |
1254 | kfree(tx.extra_frag); | |
d4e46a3d | 1255 | rcu_read_unlock(); |
e2ebc74d JB |
1256 | return 0; |
1257 | } | |
1258 | ||
1259 | /* device xmit handlers */ | |
1260 | ||
23c0752a JB |
1261 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1262 | struct sk_buff *skb, | |
1263 | int head_need, bool may_encrypt) | |
1264 | { | |
1265 | int tail_need = 0; | |
1266 | ||
1267 | /* | |
1268 | * This could be optimised, devices that do full hardware | |
1269 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1270 | * have no drivers for such devices currently. | |
1271 | */ | |
1272 | if (may_encrypt) { | |
1273 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1274 | tail_need -= skb_tailroom(skb); | |
1275 | tail_need = max_t(int, tail_need, 0); | |
1276 | } | |
1277 | ||
1278 | if (head_need || tail_need) { | |
1279 | /* Sorry. Can't account for this any more */ | |
1280 | skb_orphan(skb); | |
1281 | } | |
1282 | ||
1283 | if (skb_header_cloned(skb)) | |
1284 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1285 | else | |
1286 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1287 | ||
1288 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1289 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1290 | wiphy_name(local->hw.wiphy)); | |
1291 | return -ENOMEM; | |
1292 | } | |
1293 | ||
1294 | /* update truesize too */ | |
1295 | skb->truesize += head_need + tail_need; | |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | ||
e2ebc74d JB |
1300 | int ieee80211_master_start_xmit(struct sk_buff *skb, |
1301 | struct net_device *dev) | |
1302 | { | |
e039fa4a | 1303 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1304 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1305 | struct net_device *odev = NULL; |
1306 | struct ieee80211_sub_if_data *osdata; | |
1307 | int headroom; | |
23c0752a | 1308 | bool may_encrypt; |
e2ebc74d JB |
1309 | int ret; |
1310 | ||
d0f09804 JB |
1311 | if (skb->iif) |
1312 | odev = dev_get_by_index(&init_net, skb->iif); | |
e2ebc74d JB |
1313 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1314 | dev_put(odev); | |
1315 | odev = NULL; | |
1316 | } | |
1317 | if (unlikely(!odev)) { | |
1318 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1319 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1320 | "originating device\n", dev->name); | |
1321 | #endif | |
1322 | dev_kfree_skb(skb); | |
1323 | return 0; | |
1324 | } | |
e039fa4a | 1325 | |
d0f09804 JB |
1326 | memset(info, 0, sizeof(*info)); |
1327 | ||
1328 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1329 | ||
e2ebc74d JB |
1330 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1331 | ||
e32f85f7 LCC |
1332 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1333 | ieee80211_is_data(hdr->frame_control)) { | |
1334 | if (ieee80211_is_data(hdr->frame_control)) { | |
1335 | if (is_multicast_ether_addr(hdr->addr3)) | |
1336 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1337 | else | |
1338 | if (mesh_nexthop_lookup(skb, odev)) | |
1339 | return 0; | |
1340 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) | |
1341 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.sta, | |
1342 | fwded_frames); | |
1343 | } | |
1344 | } | |
1345 | ||
d0f09804 | 1346 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1347 | |
1348 | headroom = osdata->local->tx_headroom; | |
1349 | if (may_encrypt) | |
1350 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1351 | headroom -= skb_headroom(skb); | |
1352 | headroom = max_t(int, 0, headroom); | |
1353 | ||
1354 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1355 | dev_kfree_skb(skb); | |
1356 | dev_put(odev); | |
1357 | return 0; | |
e2ebc74d JB |
1358 | } |
1359 | ||
e039fa4a JB |
1360 | info->control.vif = &osdata->vif; |
1361 | ret = ieee80211_tx(odev, skb); | |
e2ebc74d JB |
1362 | dev_put(odev); |
1363 | ||
1364 | return ret; | |
1365 | } | |
1366 | ||
1367 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1368 | struct net_device *dev) | |
1369 | { | |
1370 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1371 | struct ieee80211_radiotap_header *prthdr = |
1372 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1373 | u16 len_rthdr; |
e2ebc74d | 1374 | |
9b8a74e3 AG |
1375 | /* check for not even having the fixed radiotap header part */ |
1376 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1377 | goto fail; /* too short to be possibly valid */ | |
1378 | ||
1379 | /* is it a header version we can trust to find length from? */ | |
1380 | if (unlikely(prthdr->it_version)) | |
1381 | goto fail; /* only version 0 is supported */ | |
1382 | ||
1383 | /* then there must be a radiotap header with a length we can use */ | |
1384 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1385 | ||
1386 | /* does the skb contain enough to deliver on the alleged length? */ | |
1387 | if (unlikely(skb->len < len_rthdr)) | |
1388 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1389 | |
1390 | skb->dev = local->mdev; | |
1391 | ||
9b8a74e3 | 1392 | /* needed because we set skb device to master */ |
d0f09804 | 1393 | skb->iif = dev->ifindex; |
9b8a74e3 | 1394 | |
d0f09804 JB |
1395 | /* sometimes we do encrypt injected frames, will be fixed |
1396 | * up in radiotap parser if not wanted */ | |
1397 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1398 | |
e2ebc74d JB |
1399 | /* |
1400 | * fix up the pointers accounting for the radiotap | |
1401 | * header still being in there. We are being given | |
1402 | * a precooked IEEE80211 header so no need for | |
1403 | * normal processing | |
1404 | */ | |
9b8a74e3 | 1405 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1406 | /* |
9b8a74e3 AG |
1407 | * these are just fixed to the end of the rt area since we |
1408 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1409 | */ |
9b8a74e3 AG |
1410 | skb_set_network_header(skb, len_rthdr); |
1411 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1412 | |
9b8a74e3 AG |
1413 | /* pass the radiotap header up to the next stage intact */ |
1414 | dev_queue_xmit(skb); | |
e2ebc74d | 1415 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1416 | |
1417 | fail: | |
1418 | dev_kfree_skb(skb); | |
1419 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1420 | } |
1421 | ||
1422 | /** | |
1423 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1424 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1425 | * @skb: packet to be sent | |
1426 | * @dev: incoming interface | |
1427 | * | |
1428 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1429 | * not be freed, and caller is responsible for either retrying later or freeing | |
1430 | * skb). | |
1431 | * | |
1432 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1433 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1434 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1435 | * transmission (through low-level driver). | |
1436 | */ | |
1437 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1438 | struct net_device *dev) | |
1439 | { | |
1440 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1441 | struct ieee80211_sub_if_data *sdata; |
1442 | int ret = 1, head_need; | |
065e9605 HH |
1443 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1444 | __le16 fc; | |
e2ebc74d | 1445 | struct ieee80211_hdr hdr; |
33b64eb2 | 1446 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1447 | const u8 *encaps_data; |
1448 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1449 | int nh_pos, h_pos; |
e2ebc74d | 1450 | struct sta_info *sta; |
ce3edf6d | 1451 | u32 sta_flags = 0; |
e2ebc74d JB |
1452 | |
1453 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1454 | if (unlikely(skb->len < ETH_HLEN)) { | |
e2ebc74d JB |
1455 | ret = 0; |
1456 | goto fail; | |
1457 | } | |
1458 | ||
1459 | nh_pos = skb_network_header(skb) - skb->data; | |
1460 | h_pos = skb_transport_header(skb) - skb->data; | |
1461 | ||
1462 | /* convert Ethernet header to proper 802.11 header (based on | |
1463 | * operation mode) */ | |
1464 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1465 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1466 | |
51fb61e7 | 1467 | switch (sdata->vif.type) { |
cf966838 JB |
1468 | case IEEE80211_IF_TYPE_AP: |
1469 | case IEEE80211_IF_TYPE_VLAN: | |
065e9605 | 1470 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1471 | /* DA BSSID SA */ |
1472 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1473 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1474 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1475 | hdrlen = 24; | |
cf966838 JB |
1476 | break; |
1477 | case IEEE80211_IF_TYPE_WDS: | |
065e9605 | 1478 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1479 | /* RA TA DA SA */ |
1480 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1481 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1482 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1483 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1484 | hdrlen = 30; | |
cf966838 | 1485 | break; |
33b64eb2 LCC |
1486 | #ifdef CONFIG_MAC80211_MESH |
1487 | case IEEE80211_IF_TYPE_MESH_POINT: | |
065e9605 | 1488 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
33b64eb2 | 1489 | /* RA TA DA SA */ |
e32f85f7 | 1490 | memset(hdr.addr1, 0, ETH_ALEN); |
33b64eb2 LCC |
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); | |
e32f85f7 LCC |
1494 | if (!sdata->u.sta.mshcfg.dot11MeshTTL) { |
1495 | /* Do not send frames with mesh_ttl == 0 */ | |
1496 | sdata->u.sta.mshstats.dropped_frames_ttl++; | |
1497 | ret = 0; | |
1498 | goto fail; | |
33b64eb2 | 1499 | } |
e32f85f7 | 1500 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); |
33b64eb2 LCC |
1501 | hdrlen = 30; |
1502 | break; | |
1503 | #endif | |
cf966838 | 1504 | case IEEE80211_IF_TYPE_STA: |
065e9605 | 1505 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1506 | /* BSSID SA DA */ |
1507 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1508 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1509 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1510 | hdrlen = 24; | |
cf966838 JB |
1511 | break; |
1512 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1513 | /* DA SA BSSID */ |
1514 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1515 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1516 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1517 | hdrlen = 24; | |
cf966838 JB |
1518 | break; |
1519 | default: | |
e2ebc74d JB |
1520 | ret = 0; |
1521 | goto fail; | |
1522 | } | |
1523 | ||
7d185b8b JB |
1524 | /* |
1525 | * There's no need to try to look up the destination | |
1526 | * if it is a multicast address (which can only happen | |
1527 | * in AP mode) | |
1528 | */ | |
1529 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1530 | rcu_read_lock(); |
7d185b8b | 1531 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1532 | if (sta) |
07346f81 | 1533 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1534 | rcu_read_unlock(); |
e2ebc74d JB |
1535 | } |
1536 | ||
3434fbd3 | 1537 | /* receiver and we are QoS enabled, use a QoS type frame */ |
e2530083 JB |
1538 | if (sta_flags & WLAN_STA_WME && |
1539 | ieee80211_num_regular_queues(&local->hw) >= 4) { | |
065e9605 | 1540 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1541 | hdrlen += 2; |
1542 | } | |
1543 | ||
1544 | /* | |
238814fd JB |
1545 | * Drop unicast frames to unauthorised stations unless they are |
1546 | * EAPOL frames from the local station. | |
ce3edf6d | 1547 | */ |
e32f85f7 LCC |
1548 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1549 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1550 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1551 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1552 | compare_ether_addr(dev->dev_addr, |
1553 | skb->data + ETH_ALEN) == 0))) { | |
1554 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1555 | DECLARE_MAC_BUF(mac); | |
1556 | ||
1557 | if (net_ratelimit()) | |
1558 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1559 | " (unauthorized port)\n", dev->name, | |
1560 | print_mac(mac, hdr.addr1)); | |
1561 | #endif | |
1562 | ||
1563 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1564 | ||
1565 | ret = 0; | |
1566 | goto fail; | |
1567 | } | |
1568 | ||
065e9605 | 1569 | hdr.frame_control = fc; |
e2ebc74d JB |
1570 | hdr.duration_id = 0; |
1571 | hdr.seq_ctrl = 0; | |
1572 | ||
1573 | skip_header_bytes = ETH_HLEN; | |
1574 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1575 | encaps_data = bridge_tunnel_header; | |
1576 | encaps_len = sizeof(bridge_tunnel_header); | |
1577 | skip_header_bytes -= 2; | |
1578 | } else if (ethertype >= 0x600) { | |
1579 | encaps_data = rfc1042_header; | |
1580 | encaps_len = sizeof(rfc1042_header); | |
1581 | skip_header_bytes -= 2; | |
1582 | } else { | |
1583 | encaps_data = NULL; | |
1584 | encaps_len = 0; | |
1585 | } | |
1586 | ||
1587 | skb_pull(skb, skip_header_bytes); | |
1588 | nh_pos -= skip_header_bytes; | |
1589 | h_pos -= skip_header_bytes; | |
1590 | ||
1591 | /* TODO: implement support for fragments so that there is no need to | |
1592 | * reallocate and copy payload; it might be enough to support one | |
1593 | * extra fragment that would be copied in the beginning of the frame | |
1594 | * data.. anyway, it would be nice to include this into skb structure | |
1595 | * somehow | |
1596 | * | |
1597 | * There are few options for this: | |
1598 | * use skb->cb as an extra space for 802.11 header | |
1599 | * allocate new buffer if not enough headroom | |
1600 | * make sure that there is enough headroom in every skb by increasing | |
1601 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1602 | * alloc_skb() (net/core/skbuff.c) | |
1603 | */ | |
23c0752a | 1604 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1605 | |
23c0752a JB |
1606 | /* |
1607 | * So we need to modify the skb header and hence need a copy of | |
1608 | * that. The head_need variable above doesn't, so far, include | |
1609 | * the needed header space that we don't need right away. If we | |
1610 | * can, then we don't reallocate right now but only after the | |
1611 | * frame arrives at the master device (if it does...) | |
1612 | * | |
1613 | * If we cannot, however, then we will reallocate to include all | |
1614 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1615 | * make it big enough for everything we may ever need. | |
1616 | */ | |
e2ebc74d | 1617 | |
3a5be7d4 | 1618 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1619 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1620 | head_need += local->tx_headroom; | |
1621 | head_need = max_t(int, 0, head_need); | |
1622 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1623 | goto fail; |
e2ebc74d JB |
1624 | } |
1625 | ||
1626 | if (encaps_data) { | |
1627 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1628 | nh_pos += encaps_len; | |
1629 | h_pos += encaps_len; | |
1630 | } | |
c29b9b9b | 1631 | |
33b64eb2 LCC |
1632 | if (meshhdrlen > 0) { |
1633 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1634 | nh_pos += meshhdrlen; | |
1635 | h_pos += meshhdrlen; | |
1636 | } | |
1637 | ||
065e9605 | 1638 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1639 | __le16 *qos_control; |
1640 | ||
1641 | qos_control = (__le16*) skb_push(skb, 2); | |
1642 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1643 | /* | |
1644 | * Maybe we could actually set some fields here, for now just | |
1645 | * initialise to zero to indicate no special operation. | |
1646 | */ | |
1647 | *qos_control = 0; | |
1648 | } else | |
1649 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1650 | ||
e2ebc74d JB |
1651 | nh_pos += hdrlen; |
1652 | h_pos += hdrlen; | |
1653 | ||
d0f09804 | 1654 | skb->iif = dev->ifindex; |
b0a67179 | 1655 | |
e2ebc74d | 1656 | skb->dev = local->mdev; |
68aae116 SH |
1657 | dev->stats.tx_packets++; |
1658 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1659 | |
1660 | /* Update skb pointers to various headers since this modified frame | |
1661 | * is going to go through Linux networking code that may potentially | |
1662 | * need things like pointer to IP header. */ | |
1663 | skb_set_mac_header(skb, 0); | |
1664 | skb_set_network_header(skb, nh_pos); | |
1665 | skb_set_transport_header(skb, h_pos); | |
1666 | ||
1667 | dev->trans_start = jiffies; | |
1668 | dev_queue_xmit(skb); | |
1669 | ||
1670 | return 0; | |
1671 | ||
1672 | fail: | |
1673 | if (!ret) | |
1674 | dev_kfree_skb(skb); | |
1675 | ||
1676 | return ret; | |
1677 | } | |
1678 | ||
e2ebc74d | 1679 | |
e2530083 JB |
1680 | /* |
1681 | * ieee80211_clear_tx_pending may not be called in a context where | |
1682 | * it is possible that it packets could come in again. | |
1683 | */ | |
e2ebc74d JB |
1684 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1685 | { | |
1686 | int i, j; | |
1687 | struct ieee80211_tx_stored_packet *store; | |
1688 | ||
e2530083 JB |
1689 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1690 | if (!test_bit(i, local->queues_pending)) | |
e2ebc74d JB |
1691 | continue; |
1692 | store = &local->pending_packet[i]; | |
1693 | kfree_skb(store->skb); | |
1694 | for (j = 0; j < store->num_extra_frag; j++) | |
1695 | kfree_skb(store->extra_frag[j]); | |
1696 | kfree(store->extra_frag); | |
e2530083 | 1697 | clear_bit(i, local->queues_pending); |
e2ebc74d JB |
1698 | } |
1699 | } | |
1700 | ||
e2530083 JB |
1701 | /* |
1702 | * Transmit all pending packets. Called from tasklet, locks master device | |
1703 | * TX lock so that no new packets can come in. | |
1704 | */ | |
e2ebc74d JB |
1705 | void ieee80211_tx_pending(unsigned long data) |
1706 | { | |
1707 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1708 | struct net_device *dev = local->mdev; | |
1709 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1710 | struct ieee80211_tx_data tx; |
e2530083 | 1711 | int i, ret; |
e2ebc74d JB |
1712 | |
1713 | netif_tx_lock_bh(dev); | |
e2530083 JB |
1714 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1715 | /* Check that this queue is ok */ | |
f8e79ddd TW |
1716 | if (__netif_subqueue_stopped(local->mdev, i) && |
1717 | !test_bit(i, local->queues_pending_run)) | |
e2ebc74d | 1718 | continue; |
e2530083 JB |
1719 | |
1720 | if (!test_bit(i, local->queues_pending)) { | |
f8e79ddd | 1721 | clear_bit(i, local->queues_pending_run); |
e2530083 | 1722 | ieee80211_wake_queue(&local->hw, i); |
e2ebc74d JB |
1723 | continue; |
1724 | } | |
e2530083 | 1725 | |
f8e79ddd TW |
1726 | clear_bit(i, local->queues_pending_run); |
1727 | netif_start_subqueue(local->mdev, i); | |
1728 | ||
e2ebc74d | 1729 | store = &local->pending_packet[i]; |
5cf121c3 JB |
1730 | tx.extra_frag = store->extra_frag; |
1731 | tx.num_extra_frag = store->num_extra_frag; | |
2e92e6f2 | 1732 | tx.last_frag_rate_idx = store->last_frag_rate_idx; |
badffb72 JS |
1733 | tx.flags = 0; |
1734 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1735 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1736 | ret = __ieee80211_tx(local, store->skb, &tx); |
1737 | if (ret) { | |
1738 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1739 | store->skb = NULL; | |
1740 | } else { | |
e2530083 JB |
1741 | clear_bit(i, local->queues_pending); |
1742 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1743 | } |
1744 | } | |
1745 | netif_tx_unlock_bh(dev); | |
e2ebc74d JB |
1746 | } |
1747 | ||
1748 | /* functions for drivers to get certain frames */ | |
1749 | ||
1750 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1751 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1752 | struct sk_buff *skb, |
1753 | struct beacon_data *beacon) | |
e2ebc74d JB |
1754 | { |
1755 | u8 *pos, *tim; | |
1756 | int aid0 = 0; | |
1757 | int i, have_bits = 0, n1, n2; | |
1758 | ||
1759 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1760 | * mode. */ | |
e2ebc74d JB |
1761 | if (atomic_read(&bss->num_sta_ps) > 0) |
1762 | /* in the hope that this is faster than | |
1763 | * checking byte-for-byte */ | |
1764 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1765 | IEEE80211_MAX_AID+1); | |
1766 | ||
1767 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1768 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1769 | else |
1770 | bss->dtim_count--; | |
1771 | ||
1772 | tim = pos = (u8 *) skb_put(skb, 6); | |
1773 | *pos++ = WLAN_EID_TIM; | |
1774 | *pos++ = 4; | |
1775 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1776 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1777 | |
1778 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1779 | aid0 = 1; | |
1780 | ||
1781 | if (have_bits) { | |
1782 | /* Find largest even number N1 so that bits numbered 1 through | |
1783 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1784 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1785 | n1 = 0; | |
1786 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1787 | if (bss->tim[i]) { | |
1788 | n1 = i & 0xfe; | |
1789 | break; | |
1790 | } | |
1791 | } | |
1792 | n2 = n1; | |
1793 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1794 | if (bss->tim[i]) { | |
1795 | n2 = i; | |
1796 | break; | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | /* Bitmap control */ | |
1801 | *pos++ = n1 | aid0; | |
1802 | /* Part Virt Bitmap */ | |
1803 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1804 | ||
1805 | tim[1] = n2 - n1 + 4; | |
1806 | skb_put(skb, n2 - n1); | |
1807 | } else { | |
1808 | *pos++ = aid0; /* Bitmap control */ | |
1809 | *pos++ = 0; /* Part Virt Bitmap */ | |
1810 | } | |
e2ebc74d JB |
1811 | } |
1812 | ||
32bfd35d | 1813 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1814 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1815 | { |
1816 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 1817 | struct sk_buff *skb = NULL; |
e039fa4a | 1818 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1819 | struct net_device *bdev; |
1820 | struct ieee80211_sub_if_data *sdata = NULL; | |
1821 | struct ieee80211_if_ap *ap = NULL; | |
9d139c81 | 1822 | struct ieee80211_if_sta *ifsta = NULL; |
1abbe498 | 1823 | struct rate_selection rsel; |
5dfdaf58 | 1824 | struct beacon_data *beacon; |
8318d78a | 1825 | struct ieee80211_supported_band *sband; |
902acc78 | 1826 | struct ieee80211_mgmt *mgmt; |
33b64eb2 | 1827 | int *num_beacons; |
2e92e6f2 | 1828 | enum ieee80211_band band = local->hw.conf.channel->band; |
902acc78 | 1829 | u8 *pos; |
8318d78a | 1830 | |
2e92e6f2 | 1831 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1832 | |
1833 | rcu_read_lock(); | |
e2ebc74d | 1834 | |
32bfd35d JB |
1835 | sdata = vif_to_sdata(vif); |
1836 | bdev = sdata->dev; | |
e2ebc74d | 1837 | |
902acc78 | 1838 | if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
33b64eb2 LCC |
1839 | ap = &sdata->u.ap; |
1840 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1841 | if (ap && beacon) { |
1842 | /* | |
1843 | * headroom, head length, | |
1844 | * tail length and maximum TIM length | |
1845 | */ | |
1846 | skb = dev_alloc_skb(local->tx_headroom + | |
1847 | beacon->head_len + | |
1848 | beacon->tail_len + 256); | |
1849 | if (!skb) | |
1850 | goto out; | |
33b64eb2 | 1851 | |
902acc78 JB |
1852 | skb_reserve(skb, local->tx_headroom); |
1853 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1854 | beacon->head_len); | |
33b64eb2 | 1855 | |
d0709a65 JB |
1856 | /* |
1857 | * Not very nice, but we want to allow the driver to call | |
1858 | * ieee80211_beacon_get() as a response to the set_tim() | |
1859 | * callback. That, however, is already invoked under the | |
1860 | * sta_lock to guarantee consistent and race-free update | |
1861 | * of the tim bitmap in mac80211 and the driver. | |
1862 | */ | |
1863 | if (local->tim_in_locked_section) { | |
1864 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1865 | } else { | |
1866 | unsigned long flags; | |
1867 | ||
1868 | spin_lock_irqsave(&local->sta_lock, flags); | |
1869 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1870 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1871 | } | |
33b64eb2 | 1872 | |
902acc78 JB |
1873 | if (beacon->tail) |
1874 | memcpy(skb_put(skb, beacon->tail_len), | |
1875 | beacon->tail, beacon->tail_len); | |
33b64eb2 | 1876 | |
902acc78 | 1877 | num_beacons = &ap->num_beacons; |
9d139c81 JB |
1878 | } else |
1879 | goto out; | |
1880 | } else if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { | |
1881 | struct ieee80211_hdr *hdr; | |
1882 | ifsta = &sdata->u.sta; | |
33b64eb2 | 1883 | |
9d139c81 JB |
1884 | if (!ifsta->probe_resp) |
1885 | goto out; | |
1886 | ||
1887 | skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC); | |
1888 | if (!skb) | |
1889 | goto out; | |
1890 | ||
1891 | hdr = (struct ieee80211_hdr *) skb->data; | |
1892 | hdr->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, | |
1893 | IEEE80211_STYPE_BEACON); | |
1894 | ||
1895 | num_beacons = &ifsta->num_beacons; | |
902acc78 JB |
1896 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1897 | /* headroom, head length, tail length and maximum TIM length */ | |
1898 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1899 | if (!skb) | |
1900 | goto out; | |
1901 | ||
1902 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1903 | mgmt = (struct ieee80211_mgmt *) | |
1904 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1905 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
1906 | mgmt->frame_control = |
1907 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
1908 | memset(mgmt->da, 0xff, ETH_ALEN); |
1909 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1910 | /* BSSID is left zeroed, wildcard value */ | |
1911 | mgmt->u.beacon.beacon_int = | |
1912 | cpu_to_le16(local->hw.conf.beacon_int); | |
1913 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1914 | ||
1915 | pos = skb_put(skb, 2); | |
1916 | *pos++ = WLAN_EID_SSID; | |
1917 | *pos++ = 0x0; | |
1918 | ||
1919 | mesh_mgmt_ies_add(skb, sdata->dev); | |
33b64eb2 | 1920 | |
33b64eb2 | 1921 | num_beacons = &sdata->u.sta.num_beacons; |
9d139c81 JB |
1922 | } else { |
1923 | WARN_ON(1); | |
5dfdaf58 | 1924 | goto out; |
e2ebc74d JB |
1925 | } |
1926 | ||
e039fa4a JB |
1927 | info = IEEE80211_SKB_CB(skb); |
1928 | ||
d0f09804 JB |
1929 | skb->do_not_encrypt = 1; |
1930 | ||
e039fa4a JB |
1931 | info->band = band; |
1932 | rate_control_get_rate(local->mdev, sband, skb, &rsel); | |
e2ebc74d | 1933 | |
e039fa4a JB |
1934 | if (unlikely(rsel.rate_idx < 0)) { |
1935 | if (net_ratelimit()) { | |
1936 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " | |
1937 | "no rate found\n", | |
1938 | wiphy_name(local->hw.wiphy)); | |
1939 | } | |
1b024165 | 1940 | dev_kfree_skb_any(skb); |
e039fa4a JB |
1941 | skb = NULL; |
1942 | goto out; | |
e2ebc74d | 1943 | } |
e039fa4a JB |
1944 | |
1945 | info->control.vif = vif; | |
1946 | info->tx_rate_idx = rsel.rate_idx; | |
f591fa5d JB |
1947 | |
1948 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
1949 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1950 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e039fa4a JB |
1951 | if (sdata->bss_conf.use_short_preamble && |
1952 | sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1953 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; | |
f591fa5d | 1954 | |
e039fa4a | 1955 | info->antenna_sel_tx = local->hw.conf.antenna_sel_tx; |
e039fa4a | 1956 | info->control.retry_limit = 1; |
f591fa5d | 1957 | |
33b64eb2 LCC |
1958 | (*num_beacons)++; |
1959 | out: | |
5dfdaf58 | 1960 | rcu_read_unlock(); |
e2ebc74d JB |
1961 | return skb; |
1962 | } | |
1963 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1964 | ||
32bfd35d | 1965 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1966 | const void *frame, size_t frame_len, |
e039fa4a | 1967 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1968 | struct ieee80211_rts *rts) |
1969 | { | |
1970 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1971 | |
065e9605 HH |
1972 | rts->frame_control = |
1973 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
1974 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1975 | frame_txctl); | |
e2ebc74d JB |
1976 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1977 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1978 | } | |
1979 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1980 | ||
32bfd35d | 1981 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1982 | const void *frame, size_t frame_len, |
e039fa4a | 1983 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1984 | struct ieee80211_cts *cts) |
1985 | { | |
1986 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1987 | |
065e9605 HH |
1988 | cts->frame_control = |
1989 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
1990 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1991 | frame_len, frame_txctl); | |
e2ebc74d JB |
1992 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1993 | } | |
1994 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1995 | ||
1996 | struct sk_buff * | |
32bfd35d | 1997 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 1998 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1999 | { |
2000 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2001 | struct sk_buff *skb = NULL; |
e2ebc74d | 2002 | struct sta_info *sta; |
5cf121c3 | 2003 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2004 | struct net_device *bdev; |
2005 | struct ieee80211_sub_if_data *sdata; | |
2006 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2007 | struct beacon_data *beacon; |
e039fa4a | 2008 | struct ieee80211_tx_info *info; |
e2ebc74d | 2009 | |
32bfd35d JB |
2010 | sdata = vif_to_sdata(vif); |
2011 | bdev = sdata->dev; | |
747cf5e9 | 2012 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2013 | |
2014 | if (!bss) | |
e2ebc74d JB |
2015 | return NULL; |
2016 | ||
5dfdaf58 JB |
2017 | rcu_read_lock(); |
2018 | beacon = rcu_dereference(bss->beacon); | |
2019 | ||
747cf5e9 TW |
2020 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || !beacon->head) |
2021 | goto out; | |
5dfdaf58 | 2022 | |
e2ebc74d | 2023 | if (bss->dtim_count != 0) |
747cf5e9 | 2024 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2025 | |
e2ebc74d JB |
2026 | while (1) { |
2027 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2028 | if (!skb) | |
747cf5e9 | 2029 | goto out; |
e2ebc74d JB |
2030 | local->total_ps_buffered--; |
2031 | ||
2032 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2033 | struct ieee80211_hdr *hdr = | |
2034 | (struct ieee80211_hdr *) skb->data; | |
2035 | /* more buffered multicast/broadcast frames ==> set | |
2036 | * MoreData flag in IEEE 802.11 header to inform PS | |
2037 | * STAs */ | |
2038 | hdr->frame_control |= | |
2039 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2040 | } | |
2041 | ||
e039fa4a | 2042 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev)) |
e2ebc74d JB |
2043 | break; |
2044 | dev_kfree_skb_any(skb); | |
2045 | } | |
e039fa4a JB |
2046 | |
2047 | info = IEEE80211_SKB_CB(skb); | |
2048 | ||
e2ebc74d | 2049 | sta = tx.sta; |
5cf121c3 JB |
2050 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2051 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2052 | info->band = tx.channel->band; |
e2ebc74d | 2053 | |
97b045d6 | 2054 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2055 | skb = NULL; |
97b045d6 | 2056 | out: |
d0709a65 | 2057 | rcu_read_unlock(); |
e2ebc74d JB |
2058 | |
2059 | return skb; | |
2060 | } | |
2061 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |