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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 | ||
41 | static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata, | |
42 | struct ieee80211_hdr *hdr) | |
43 | { | |
44 | /* Set the sequence number for this frame. */ | |
45 | hdr->seq_ctrl = cpu_to_le16(sdata->sequence); | |
46 | ||
47 | /* Increase the sequence number. */ | |
48 | sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ; | |
49 | } | |
50 | ||
51 | #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP | |
52 | static void ieee80211_dump_frame(const char *ifname, const char *title, | |
53 | const struct sk_buff *skb) | |
54 | { | |
065e9605 HH |
55 | const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
56 | unsigned int hdrlen; | |
0795af57 | 57 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
58 | |
59 | printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len); | |
60 | if (skb->len < 4) { | |
61 | printk("\n"); | |
62 | return; | |
63 | } | |
64 | ||
065e9605 | 65 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
66 | if (hdrlen > skb->len) |
67 | hdrlen = skb->len; | |
68 | if (hdrlen >= 4) | |
69 | printk(" FC=0x%04x DUR=0x%04x", | |
065e9605 | 70 | le16_to_cpu(hdr->frame_control), le16_to_cpu(hdr->duration_id)); |
e2ebc74d | 71 | if (hdrlen >= 10) |
0795af57 | 72 | printk(" A1=%s", print_mac(mac, hdr->addr1)); |
e2ebc74d | 73 | if (hdrlen >= 16) |
0795af57 | 74 | printk(" A2=%s", print_mac(mac, hdr->addr2)); |
e2ebc74d | 75 | if (hdrlen >= 24) |
0795af57 | 76 | printk(" A3=%s", print_mac(mac, hdr->addr3)); |
e2ebc74d | 77 | if (hdrlen >= 30) |
0795af57 | 78 | printk(" A4=%s", print_mac(mac, hdr->addr4)); |
e2ebc74d JB |
79 | printk("\n"); |
80 | } | |
81 | #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
82 | static inline void ieee80211_dump_frame(const char *ifname, const char *title, | |
83 | struct sk_buff *skb) | |
84 | { | |
85 | } | |
86 | #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ | |
87 | ||
03f93c3d JB |
88 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
89 | int next_frag_len) | |
e2ebc74d JB |
90 | { |
91 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 92 | struct ieee80211_rate *txrate; |
e2ebc74d | 93 | struct ieee80211_local *local = tx->local; |
8318d78a | 94 | struct ieee80211_supported_band *sband; |
e2ebc74d | 95 | |
2e92e6f2 JB |
96 | sband = local->hw.wiphy->bands[tx->channel->band]; |
97 | txrate = &sband->bitrates[tx->rate_idx]; | |
8318d78a JB |
98 | |
99 | erp = 0; | |
100 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
101 | erp = txrate->flags & IEEE80211_RATE_ERP_G; | |
e2ebc74d JB |
102 | |
103 | /* | |
104 | * data and mgmt (except PS Poll): | |
105 | * - during CFP: 32768 | |
106 | * - during contention period: | |
107 | * if addr1 is group address: 0 | |
108 | * if more fragments = 0 and addr1 is individual address: time to | |
109 | * transmit one ACK plus SIFS | |
110 | * if more fragments = 1 and addr1 is individual address: time to | |
111 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
112 | * | |
113 | * IEEE 802.11, 9.6: | |
114 | * - control response frame (CTS or ACK) shall be transmitted using the | |
115 | * same rate as the immediately previous frame in the frame exchange | |
116 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
117 | * at the highest possible rate belonging to the PHY rates in the | |
118 | * BSSBasicRateSet | |
119 | */ | |
120 | ||
121 | if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) { | |
122 | /* TODO: These control frames are not currently sent by | |
123 | * 80211.o, but should they be implemented, this function | |
124 | * needs to be updated to support duration field calculation. | |
125 | * | |
126 | * RTS: time needed to transmit pending data/mgmt frame plus | |
127 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
128 | * CTS: duration of immediately previous RTS minus time | |
129 | * required to transmit CTS and its SIFS | |
130 | * ACK: 0 if immediately previous directed data/mgmt had | |
131 | * more=0, with more=1 duration in ACK frame is duration | |
132 | * from previous frame minus time needed to transmit ACK | |
133 | * and its SIFS | |
134 | * PS Poll: BIT(15) | BIT(14) | aid | |
135 | */ | |
136 | return 0; | |
137 | } | |
138 | ||
139 | /* data/mgmt */ | |
140 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 141 | return cpu_to_le16(32768); |
e2ebc74d JB |
142 | |
143 | if (group_addr) /* Group address as the destination - no ACK */ | |
144 | return 0; | |
145 | ||
146 | /* Individual destination address: | |
147 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
148 | * CTS and ACK frames shall be transmitted using the highest rate in | |
149 | * basic rate set that is less than or equal to the rate of the | |
150 | * immediately previous frame and that is using the same modulation | |
151 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
152 | * the highest mandatory rate of the PHY that is less than or equal to | |
153 | * the rate of the previous frame is used. | |
154 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
155 | */ | |
156 | rate = -1; | |
8318d78a JB |
157 | /* use lowest available if everything fails */ |
158 | mrate = sband->bitrates[0].bitrate; | |
159 | for (i = 0; i < sband->n_bitrates; i++) { | |
160 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 161 | |
8318d78a JB |
162 | if (r->bitrate > txrate->bitrate) |
163 | break; | |
e2ebc74d | 164 | |
8318d78a JB |
165 | if (tx->sdata->basic_rates & BIT(i)) |
166 | rate = r->bitrate; | |
167 | ||
168 | switch (sband->band) { | |
169 | case IEEE80211_BAND_2GHZ: { | |
170 | u32 flag; | |
171 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
172 | flag = IEEE80211_RATE_MANDATORY_G; | |
173 | else | |
174 | flag = IEEE80211_RATE_MANDATORY_B; | |
175 | if (r->flags & flag) | |
176 | mrate = r->bitrate; | |
177 | break; | |
178 | } | |
179 | case IEEE80211_BAND_5GHZ: | |
180 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
181 | mrate = r->bitrate; | |
182 | break; | |
183 | case IEEE80211_NUM_BANDS: | |
184 | WARN_ON(1); | |
185 | break; | |
186 | } | |
e2ebc74d JB |
187 | } |
188 | if (rate == -1) { | |
189 | /* No matching basic rate found; use highest suitable mandatory | |
190 | * PHY rate */ | |
191 | rate = mrate; | |
192 | } | |
193 | ||
194 | /* Time needed to transmit ACK | |
195 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
196 | * to closest integer */ | |
197 | ||
198 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
471b3efd | 199 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
200 | |
201 | if (next_frag_len) { | |
202 | /* Frame is fragmented: duration increases with time needed to | |
203 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
204 | dur *= 2; /* ACK + SIFS */ | |
205 | /* next fragment */ | |
206 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 207 | txrate->bitrate, erp, |
471b3efd | 208 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
209 | } |
210 | ||
03f93c3d | 211 | return cpu_to_le16(dur); |
e2ebc74d JB |
212 | } |
213 | ||
e2ebc74d JB |
214 | static int inline is_ieee80211_device(struct net_device *dev, |
215 | struct net_device *master) | |
216 | { | |
217 | return (wdev_priv(dev->ieee80211_ptr) == | |
218 | wdev_priv(master->ieee80211_ptr)); | |
219 | } | |
220 | ||
221 | /* tx handlers */ | |
222 | ||
d9e8a70f | 223 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 224 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
225 | { |
226 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
e039fa4a | 227 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2ebc74d | 228 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
e039fa4a | 229 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
230 | u32 sta_flags; |
231 | ||
e039fa4a | 232 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 233 | return TX_CONTINUE; |
58d4185e | 234 | |
ece8eddd | 235 | if (unlikely(tx->local->sta_sw_scanning) && |
e2ebc74d JB |
236 | ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || |
237 | (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ)) | |
9ae54c84 | 238 | return TX_DROP; |
e2ebc74d | 239 | |
33b64eb2 LCC |
240 | if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) |
241 | return TX_CONTINUE; | |
242 | ||
5cf121c3 | 243 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 244 | return TX_CONTINUE; |
e2ebc74d | 245 | |
07346f81 | 246 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 247 | |
5cf121c3 | 248 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 249 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
51fb61e7 | 250 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
e2ebc74d JB |
251 | (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) { |
252 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0795af57 | 253 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 254 | printk(KERN_DEBUG "%s: dropped data frame to not " |
0795af57 JP |
255 | "associated station %s\n", |
256 | tx->dev->name, print_mac(mac, hdr->addr1)); | |
e2ebc74d JB |
257 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
258 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 259 | return TX_DROP; |
e2ebc74d JB |
260 | } |
261 | } else { | |
262 | if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
263 | tx->local->num_sta == 0 && | |
51fb61e7 | 264 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) { |
e2ebc74d JB |
265 | /* |
266 | * No associated STAs - no need to send multicast | |
267 | * frames. | |
268 | */ | |
9ae54c84 | 269 | return TX_DROP; |
e2ebc74d | 270 | } |
9ae54c84 | 271 | return TX_CONTINUE; |
e2ebc74d JB |
272 | } |
273 | ||
9ae54c84 | 274 | return TX_CONTINUE; |
e2ebc74d JB |
275 | } |
276 | ||
d9e8a70f | 277 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 278 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
279 | { |
280 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
281 | ||
065e9605 | 282 | if (ieee80211_hdrlen(hdr->frame_control) >= 24) |
e2ebc74d JB |
283 | ieee80211_include_sequence(tx->sdata, hdr); |
284 | ||
9ae54c84 | 285 | return TX_CONTINUE; |
e2ebc74d JB |
286 | } |
287 | ||
288 | /* This function is called whenever the AP is about to exceed the maximum limit | |
289 | * of buffered frames for power saving STAs. This situation should not really | |
290 | * happen often during normal operation, so dropping the oldest buffered packet | |
291 | * from each queue should be OK to make some room for new frames. */ | |
292 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
293 | { | |
294 | int total = 0, purged = 0; | |
295 | struct sk_buff *skb; | |
296 | struct ieee80211_sub_if_data *sdata; | |
297 | struct sta_info *sta; | |
298 | ||
79010420 JB |
299 | /* |
300 | * virtual interfaces are protected by RCU | |
301 | */ | |
302 | rcu_read_lock(); | |
303 | ||
304 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d JB |
305 | struct ieee80211_if_ap *ap; |
306 | if (sdata->dev == local->mdev || | |
51fb61e7 | 307 | sdata->vif.type != IEEE80211_IF_TYPE_AP) |
e2ebc74d JB |
308 | continue; |
309 | ap = &sdata->u.ap; | |
310 | skb = skb_dequeue(&ap->ps_bc_buf); | |
311 | if (skb) { | |
312 | purged++; | |
313 | dev_kfree_skb(skb); | |
314 | } | |
315 | total += skb_queue_len(&ap->ps_bc_buf); | |
316 | } | |
e2ebc74d | 317 | |
d0709a65 | 318 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
319 | skb = skb_dequeue(&sta->ps_tx_buf); |
320 | if (skb) { | |
321 | purged++; | |
322 | dev_kfree_skb(skb); | |
323 | } | |
324 | total += skb_queue_len(&sta->ps_tx_buf); | |
325 | } | |
d0709a65 JB |
326 | |
327 | rcu_read_unlock(); | |
e2ebc74d JB |
328 | |
329 | local->total_ps_buffered = total; | |
330 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", | |
dd1cd4c6 | 331 | wiphy_name(local->hw.wiphy), purged); |
e2ebc74d JB |
332 | } |
333 | ||
9ae54c84 | 334 | static ieee80211_tx_result |
5cf121c3 | 335 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 336 | { |
e039fa4a JB |
337 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
338 | ||
7d54d0dd JB |
339 | /* |
340 | * broadcast/multicast frame | |
341 | * | |
342 | * If any of the associated stations is in power save mode, | |
343 | * the frame is buffered to be sent after DTIM beacon frame. | |
344 | * This is done either by the hardware or us. | |
345 | */ | |
346 | ||
347 | /* not AP/IBSS or ordered frame */ | |
348 | if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER)) | |
9ae54c84 | 349 | return TX_CONTINUE; |
7d54d0dd JB |
350 | |
351 | /* no stations in PS mode */ | |
352 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 353 | return TX_CONTINUE; |
7d54d0dd JB |
354 | |
355 | /* buffered in mac80211 */ | |
356 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
357 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
358 | purge_old_ps_buffers(tx->local); | |
359 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
360 | AP_MAX_BC_BUFFER) { | |
361 | if (net_ratelimit()) { | |
362 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
363 | "dropping the oldest frame\n", | |
364 | tx->dev->name); | |
365 | } | |
366 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); | |
367 | } else | |
368 | tx->local->total_ps_buffered++; | |
369 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 370 | return TX_QUEUED; |
e2ebc74d JB |
371 | } |
372 | ||
7d54d0dd | 373 | /* buffered in hardware */ |
e039fa4a | 374 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 375 | |
9ae54c84 | 376 | return TX_CONTINUE; |
e2ebc74d JB |
377 | } |
378 | ||
9ae54c84 | 379 | static ieee80211_tx_result |
5cf121c3 | 380 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
381 | { |
382 | struct sta_info *sta = tx->sta; | |
e039fa4a | 383 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
07346f81 | 384 | u32 staflags; |
0795af57 | 385 | DECLARE_MAC_BUF(mac); |
e2ebc74d JB |
386 | |
387 | if (unlikely(!sta || | |
388 | ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && | |
389 | (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) | |
9ae54c84 | 390 | return TX_CONTINUE; |
e2ebc74d | 391 | |
07346f81 JB |
392 | staflags = get_sta_flags(sta); |
393 | ||
394 | if (unlikely((staflags & WLAN_STA_PS) && | |
395 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 396 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 | 397 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 398 | "before %d)\n", |
0795af57 | 399 | print_mac(mac, sta->addr), sta->aid, |
e2ebc74d JB |
400 | skb_queue_len(&sta->ps_tx_buf)); |
401 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
402 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
403 | purge_old_ps_buffers(tx->local); | |
404 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
405 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
406 | if (net_ratelimit()) { | |
0795af57 | 407 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 408 | "buffer full - dropping oldest frame\n", |
0795af57 | 409 | tx->dev->name, print_mac(mac, sta->addr)); |
e2ebc74d JB |
410 | } |
411 | dev_kfree_skb(old); | |
412 | } else | |
413 | tx->local->total_ps_buffered++; | |
004c872e | 414 | |
e2ebc74d | 415 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
416 | if (skb_queue_empty(&sta->ps_tx_buf)) |
417 | sta_info_set_tim_bit(sta); | |
418 | ||
e039fa4a | 419 | info->control.jiffies = jiffies; |
e2ebc74d | 420 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 421 | return TX_QUEUED; |
e2ebc74d JB |
422 | } |
423 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 424 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0795af57 | 425 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 426 | "set -> send frame\n", tx->dev->name, |
0795af57 | 427 | print_mac(mac, sta->addr)); |
e2ebc74d JB |
428 | } |
429 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 430 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 431 | |
9ae54c84 | 432 | return TX_CONTINUE; |
e2ebc74d JB |
433 | } |
434 | ||
d9e8a70f | 435 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 436 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 437 | { |
5cf121c3 | 438 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 439 | return TX_CONTINUE; |
e2ebc74d | 440 | |
5cf121c3 | 441 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
442 | return ieee80211_tx_h_unicast_ps_buf(tx); |
443 | else | |
444 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
445 | } | |
446 | ||
d9e8a70f | 447 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 448 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 449 | { |
d4e46a3d | 450 | struct ieee80211_key *key; |
e039fa4a | 451 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
176e4f84 | 452 | u16 fc = tx->fc; |
d4e46a3d | 453 | |
e039fa4a | 454 | if (unlikely(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT)) |
e2ebc74d | 455 | tx->key = NULL; |
d4e46a3d JB |
456 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
457 | tx->key = key; | |
458 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
459 | tx->key = key; | |
e2ebc74d | 460 | else if (tx->sdata->drop_unencrypted && |
e039fa4a JB |
461 | !(info->flags & IEEE80211_TX_CTL_EAPOL_FRAME) && |
462 | !(info->flags & IEEE80211_TX_CTL_INJECTED)) { | |
e2ebc74d | 463 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 464 | return TX_DROP; |
176e4f84 | 465 | } else |
e2ebc74d JB |
466 | tx->key = NULL; |
467 | ||
468 | if (tx->key) { | |
176e4f84 JB |
469 | u16 ftype, stype; |
470 | ||
e2ebc74d | 471 | tx->key->tx_rx_count++; |
011bfcc4 | 472 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
473 | |
474 | switch (tx->key->conf.alg) { | |
475 | case ALG_WEP: | |
476 | ftype = fc & IEEE80211_FCTL_FTYPE; | |
477 | stype = fc & IEEE80211_FCTL_STYPE; | |
478 | ||
479 | if (ftype == IEEE80211_FTYPE_MGMT && | |
480 | stype == IEEE80211_STYPE_AUTH) | |
481 | break; | |
482 | case ALG_TKIP: | |
483 | case ALG_CCMP: | |
484 | if (!WLAN_FC_DATA_PRESENT(fc)) | |
485 | tx->key = NULL; | |
486 | break; | |
487 | } | |
e2ebc74d JB |
488 | } |
489 | ||
176e4f84 | 490 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
e039fa4a | 491 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; |
176e4f84 | 492 | |
9ae54c84 | 493 | return TX_CONTINUE; |
e2ebc74d JB |
494 | } |
495 | ||
d9e8a70f | 496 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 497 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 498 | { |
1abbe498 | 499 | struct rate_selection rsel; |
8318d78a | 500 | struct ieee80211_supported_band *sband; |
e039fa4a | 501 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
8318d78a | 502 | |
2e92e6f2 | 503 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d | 504 | |
2e92e6f2 | 505 | if (likely(tx->rate_idx < 0)) { |
8318d78a | 506 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
2e92e6f2 JB |
507 | tx->rate_idx = rsel.rate_idx; |
508 | if (unlikely(rsel.probe_idx >= 0)) { | |
e039fa4a | 509 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
5cf121c3 | 510 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e039fa4a | 511 | info->control.alt_retry_rate_idx = tx->rate_idx; |
2e92e6f2 | 512 | tx->rate_idx = rsel.probe_idx; |
58d4185e | 513 | } else |
e039fa4a | 514 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 515 | |
2e92e6f2 | 516 | if (unlikely(tx->rate_idx < 0)) |
9ae54c84 | 517 | return TX_DROP; |
58d4185e | 518 | } else |
e039fa4a | 519 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 520 | |
8318d78a | 521 | if (tx->sdata->bss_conf.use_cts_prot && |
2e92e6f2 JB |
522 | (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) { |
523 | tx->last_frag_rate_idx = tx->rate_idx; | |
524 | if (rsel.probe_idx >= 0) | |
5cf121c3 | 525 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 526 | else |
5cf121c3 | 527 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
2e92e6f2 | 528 | tx->rate_idx = rsel.nonerp_idx; |
e039fa4a JB |
529 | info->tx_rate_idx = rsel.nonerp_idx; |
530 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 531 | } else { |
2e92e6f2 | 532 | tx->last_frag_rate_idx = tx->rate_idx; |
e039fa4a | 533 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 534 | } |
e039fa4a | 535 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 536 | |
9ae54c84 | 537 | return TX_CONTINUE; |
e2ebc74d JB |
538 | } |
539 | ||
d9e8a70f | 540 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 541 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d | 542 | { |
065e9605 | 543 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 544 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
2e92e6f2 JB |
545 | struct ieee80211_supported_band *sband; |
546 | ||
547 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
e2ebc74d | 548 | |
e039fa4a JB |
549 | if (tx->sta) |
550 | info->control.aid = tx->sta->aid; | |
551 | ||
552 | if (!info->control.retry_limit) { | |
58d4185e | 553 | if (!is_multicast_ether_addr(hdr->addr1)) { |
e039fa4a JB |
554 | int len = min_t(int, tx->skb->len + FCS_LEN, |
555 | tx->local->fragmentation_threshold); | |
556 | if (len > tx->local->rts_threshold | |
58d4185e | 557 | && tx->local->rts_threshold < |
e039fa4a JB |
558 | IEEE80211_MAX_RTS_THRESHOLD) { |
559 | info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS; | |
560 | info->flags |= | |
561 | IEEE80211_TX_CTL_LONG_RETRY_LIMIT; | |
562 | info->control.retry_limit = | |
58d4185e JB |
563 | tx->local->long_retry_limit; |
564 | } else { | |
e039fa4a | 565 | info->control.retry_limit = |
58d4185e JB |
566 | tx->local->short_retry_limit; |
567 | } | |
e2ebc74d | 568 | } else { |
e039fa4a | 569 | info->control.retry_limit = 1; |
e2ebc74d | 570 | } |
e2ebc74d JB |
571 | } |
572 | ||
5cf121c3 | 573 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
574 | /* Do not use multiple retry rates when sending fragmented |
575 | * frames. | |
576 | * TODO: The last fragment could still use multiple retry | |
577 | * rates. */ | |
e039fa4a | 578 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
579 | } |
580 | ||
581 | /* Use CTS protection for unicast frames sent using extended rates if | |
582 | * there are associated non-ERP stations and RTS/CTS is not configured | |
583 | * for the frame. */ | |
8318d78a | 584 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
2e92e6f2 | 585 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) && |
5cf121c3 | 586 | (tx->flags & IEEE80211_TX_UNICAST) && |
471b3efd | 587 | tx->sdata->bss_conf.use_cts_prot && |
e039fa4a JB |
588 | !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)) |
589 | info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT; | |
e2ebc74d | 590 | |
7e9ed188 DD |
591 | /* Transmit data frames using short preambles if the driver supports |
592 | * short preambles at the selected rate and short preambles are | |
593 | * available on the network at the current point in time. */ | |
065e9605 | 594 | if (ieee80211_is_data(hdr->frame_control) && |
2e92e6f2 | 595 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 596 | tx->sdata->bss_conf.use_short_preamble && |
07346f81 | 597 | (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) { |
e039fa4a | 598 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; |
7e9ed188 DD |
599 | } |
600 | ||
e039fa4a JB |
601 | if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) || |
602 | (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) { | |
2e92e6f2 JB |
603 | struct ieee80211_rate *rate; |
604 | s8 baserate = -1; | |
8318d78a JB |
605 | int idx; |
606 | ||
e2ebc74d | 607 | /* Do not use multiple retry rates when using RTS/CTS */ |
e039fa4a | 608 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
609 | |
610 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
2e92e6f2 | 611 | rate = &sband->bitrates[tx->rate_idx]; |
8318d78a JB |
612 | |
613 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
614 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
615 | continue; | |
616 | if (tx->sdata->basic_rates & BIT(idx) && | |
2e92e6f2 JB |
617 | (baserate < 0 || |
618 | (sband->bitrates[baserate].bitrate | |
619 | < sband->bitrates[idx].bitrate))) | |
620 | baserate = idx; | |
8318d78a | 621 | } |
e2ebc74d | 622 | |
2e92e6f2 | 623 | if (baserate >= 0) |
e039fa4a | 624 | info->control.rts_cts_rate_idx = baserate; |
8318d78a | 625 | else |
e039fa4a | 626 | info->control.rts_cts_rate_idx = 0; |
e2ebc74d JB |
627 | } |
628 | ||
e2454948 | 629 | if (tx->sta) |
e039fa4a | 630 | info->control.aid = tx->sta->aid; |
e2454948 JB |
631 | |
632 | return TX_CONTINUE; | |
633 | } | |
634 | ||
d9e8a70f | 635 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
636 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
637 | { | |
065e9605 | 638 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2454948 JB |
639 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; |
640 | struct sk_buff **frags, *first, *frag; | |
641 | int i; | |
642 | u16 seq; | |
643 | u8 *pos; | |
644 | int frag_threshold = tx->local->fragmentation_threshold; | |
645 | ||
646 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
647 | return TX_CONTINUE; | |
648 | ||
eefce91a JB |
649 | /* |
650 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
651 | * This scenario is handled in __ieee80211_tx_prepare but extra |
652 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a JB |
653 | */ |
654 | if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU || | |
e2530083 JB |
655 | skb_get_queue_mapping(tx->skb) >= |
656 | ieee80211_num_regular_queues(&tx->local->hw))) | |
eefce91a JB |
657 | return TX_DROP; |
658 | ||
e2454948 JB |
659 | first = tx->skb; |
660 | ||
065e9605 | 661 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 JB |
662 | payload_len = first->len - hdrlen; |
663 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
664 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
665 | ||
666 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
667 | if (!frags) | |
668 | goto fail; | |
669 | ||
670 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
671 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
672 | pos = first->data + hdrlen + per_fragm; | |
673 | left = payload_len - per_fragm; | |
674 | for (i = 0; i < num_fragm - 1; i++) { | |
675 | struct ieee80211_hdr *fhdr; | |
676 | size_t copylen; | |
677 | ||
678 | if (left <= 0) | |
679 | goto fail; | |
680 | ||
681 | /* reserve enough extra head and tail room for possible | |
682 | * encryption */ | |
683 | frag = frags[i] = | |
684 | dev_alloc_skb(tx->local->tx_headroom + | |
685 | frag_threshold + | |
686 | IEEE80211_ENCRYPT_HEADROOM + | |
687 | IEEE80211_ENCRYPT_TAILROOM); | |
688 | if (!frag) | |
689 | goto fail; | |
690 | /* Make sure that all fragments use the same priority so | |
691 | * that they end up using the same TX queue */ | |
692 | frag->priority = first->priority; | |
693 | skb_reserve(frag, tx->local->tx_headroom + | |
694 | IEEE80211_ENCRYPT_HEADROOM); | |
695 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
696 | memcpy(fhdr, first->data, hdrlen); | |
697 | if (i == num_fragm - 2) | |
698 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
699 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
700 | copylen = left > per_fragm ? per_fragm : left; | |
701 | memcpy(skb_put(frag, copylen), pos, copylen); | |
03f93c3d JB |
702 | memcpy(frag->cb, first->cb, sizeof(frag->cb)); |
703 | skb_copy_queue_mapping(frag, first); | |
e2454948 JB |
704 | |
705 | pos += copylen; | |
706 | left -= copylen; | |
e2ebc74d | 707 | } |
e2454948 JB |
708 | skb_trim(first, hdrlen + per_fragm); |
709 | ||
710 | tx->num_extra_frag = num_fragm - 1; | |
711 | tx->extra_frag = frags; | |
e2ebc74d | 712 | |
9ae54c84 | 713 | return TX_CONTINUE; |
e2454948 JB |
714 | |
715 | fail: | |
716 | printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); | |
717 | if (frags) { | |
718 | for (i = 0; i < num_fragm - 1; i++) | |
719 | if (frags[i]) | |
720 | dev_kfree_skb(frags[i]); | |
721 | kfree(frags); | |
722 | } | |
723 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
724 | return TX_DROP; | |
e2ebc74d JB |
725 | } |
726 | ||
d9e8a70f | 727 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
728 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
729 | { | |
730 | if (!tx->key) | |
731 | return TX_CONTINUE; | |
732 | ||
733 | switch (tx->key->conf.alg) { | |
734 | case ALG_WEP: | |
735 | return ieee80211_crypto_wep_encrypt(tx); | |
736 | case ALG_TKIP: | |
737 | return ieee80211_crypto_tkip_encrypt(tx); | |
738 | case ALG_CCMP: | |
739 | return ieee80211_crypto_ccmp_encrypt(tx); | |
740 | } | |
741 | ||
742 | /* not reached */ | |
743 | WARN_ON(1); | |
744 | return TX_DROP; | |
745 | } | |
746 | ||
d9e8a70f | 747 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
748 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
749 | { | |
750 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
751 | int next_len, i; | |
752 | int group_addr = is_multicast_ether_addr(hdr->addr1); | |
753 | ||
754 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) { | |
755 | hdr->duration_id = ieee80211_duration(tx, group_addr, 0); | |
756 | return TX_CONTINUE; | |
757 | } | |
758 | ||
759 | hdr->duration_id = ieee80211_duration(tx, group_addr, | |
760 | tx->extra_frag[0]->len); | |
761 | ||
762 | for (i = 0; i < tx->num_extra_frag; i++) { | |
763 | if (i + 1 < tx->num_extra_frag) { | |
764 | next_len = tx->extra_frag[i + 1]->len; | |
765 | } else { | |
766 | next_len = 0; | |
767 | tx->rate_idx = tx->last_frag_rate_idx; | |
768 | } | |
769 | ||
770 | hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data; | |
771 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); | |
772 | } | |
773 | ||
774 | return TX_CONTINUE; | |
775 | } | |
776 | ||
d9e8a70f | 777 | static ieee80211_tx_result debug_noinline |
e2454948 | 778 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 779 | { |
9e72ebd6 | 780 | int i; |
e2ebc74d | 781 | |
9e72ebd6 JB |
782 | if (!tx->sta) |
783 | return TX_CONTINUE; | |
e2ebc74d | 784 | |
9e72ebd6 JB |
785 | tx->sta->tx_packets++; |
786 | tx->sta->tx_fragments++; | |
787 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 788 | if (tx->extra_frag) { |
9e72ebd6 JB |
789 | tx->sta->tx_fragments += tx->num_extra_frag; |
790 | for (i = 0; i < tx->num_extra_frag; i++) | |
791 | tx->sta->tx_bytes += tx->extra_frag[i]->len; | |
e2454948 JB |
792 | } |
793 | ||
9ae54c84 | 794 | return TX_CONTINUE; |
e2ebc74d JB |
795 | } |
796 | ||
e2ebc74d | 797 | |
e2ebc74d JB |
798 | /* actual transmit path */ |
799 | ||
800 | /* | |
801 | * deal with packet injection down monitor interface | |
802 | * with Radiotap Header -- only called for monitor mode interface | |
803 | */ | |
9ae54c84 | 804 | static ieee80211_tx_result |
5cf121c3 | 805 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 806 | struct sk_buff *skb) |
e2ebc74d JB |
807 | { |
808 | /* | |
809 | * this is the moment to interpret and discard the radiotap header that | |
810 | * must be at the start of the packet injected in Monitor mode | |
811 | * | |
812 | * Need to take some care with endian-ness since radiotap | |
813 | * args are little-endian | |
814 | */ | |
815 | ||
816 | struct ieee80211_radiotap_iterator iterator; | |
817 | struct ieee80211_radiotap_header *rthdr = | |
818 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 819 | struct ieee80211_supported_band *sband; |
e2ebc74d | 820 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
e039fa4a | 821 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 822 | |
2e92e6f2 | 823 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 824 | |
e039fa4a JB |
825 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; |
826 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
5cf121c3 | 827 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
828 | |
829 | /* | |
830 | * for every radiotap entry that is present | |
831 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
832 | * entries present, or -EINVAL on error) | |
833 | */ | |
834 | ||
835 | while (!ret) { | |
836 | int i, target_rate; | |
837 | ||
838 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
839 | ||
840 | if (ret) | |
841 | continue; | |
842 | ||
843 | /* see if this argument is something we can use */ | |
844 | switch (iterator.this_arg_index) { | |
845 | /* | |
846 | * You must take care when dereferencing iterator.this_arg | |
847 | * for multibyte types... the pointer is not aligned. Use | |
848 | * get_unaligned((type *)iterator.this_arg) to dereference | |
849 | * iterator.this_arg for type "type" safely on all arches. | |
850 | */ | |
851 | case IEEE80211_RADIOTAP_RATE: | |
852 | /* | |
853 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
854 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
855 | */ | |
856 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
857 | for (i = 0; i < sband->n_bitrates; i++) { |
858 | struct ieee80211_rate *r; | |
e2ebc74d | 859 | |
8318d78a JB |
860 | r = &sband->bitrates[i]; |
861 | ||
862 | if (r->bitrate == target_rate) { | |
2e92e6f2 | 863 | tx->rate_idx = i; |
58d4185e JB |
864 | break; |
865 | } | |
e2ebc74d JB |
866 | } |
867 | break; | |
868 | ||
869 | case IEEE80211_RADIOTAP_ANTENNA: | |
870 | /* | |
871 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
872 | * 1st ant | |
873 | */ | |
e039fa4a | 874 | info->antenna_sel_tx = (*iterator.this_arg) + 1; |
e2ebc74d JB |
875 | break; |
876 | ||
8318d78a | 877 | #if 0 |
e2ebc74d JB |
878 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
879 | control->power_level = *iterator.this_arg; | |
880 | break; | |
8318d78a | 881 | #endif |
e2ebc74d JB |
882 | |
883 | case IEEE80211_RADIOTAP_FLAGS: | |
884 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
885 | /* | |
886 | * this indicates that the skb we have been | |
887 | * handed has the 32-bit FCS CRC at the end... | |
888 | * we should react to that by snipping it off | |
889 | * because it will be recomputed and added | |
890 | * on transmission | |
891 | */ | |
892 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 893 | return TX_DROP; |
e2ebc74d JB |
894 | |
895 | skb_trim(skb, skb->len - FCS_LEN); | |
896 | } | |
58d4185e | 897 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
e039fa4a JB |
898 | info->flags &= |
899 | ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT; | |
58d4185e | 900 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 901 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
902 | break; |
903 | ||
58d4185e JB |
904 | /* |
905 | * Please update the file | |
906 | * Documentation/networking/mac80211-injection.txt | |
907 | * when parsing new fields here. | |
908 | */ | |
909 | ||
e2ebc74d JB |
910 | default: |
911 | break; | |
912 | } | |
913 | } | |
914 | ||
915 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 916 | return TX_DROP; |
e2ebc74d JB |
917 | |
918 | /* | |
919 | * remove the radiotap header | |
920 | * iterator->max_length was sanity-checked against | |
921 | * skb->len by iterator init | |
922 | */ | |
923 | skb_pull(skb, iterator.max_length); | |
924 | ||
9ae54c84 | 925 | return TX_CONTINUE; |
e2ebc74d JB |
926 | } |
927 | ||
58d4185e JB |
928 | /* |
929 | * initialises @tx | |
930 | */ | |
9ae54c84 | 931 | static ieee80211_tx_result |
5cf121c3 | 932 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 933 | struct sk_buff *skb, |
e039fa4a | 934 | struct net_device *dev) |
e2ebc74d JB |
935 | { |
936 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 937 | struct ieee80211_hdr *hdr; |
e2ebc74d | 938 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 939 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
940 | |
941 | int hdrlen; | |
942 | ||
943 | memset(tx, 0, sizeof(*tx)); | |
944 | tx->skb = skb; | |
945 | tx->dev = dev; /* use original interface */ | |
946 | tx->local = local; | |
947 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 948 | tx->channel = local->hw.conf.channel; |
5854a32e JB |
949 | tx->rate_idx = -1; |
950 | tx->last_frag_rate_idx = -1; | |
e2ebc74d | 951 | /* |
58d4185e JB |
952 | * Set this flag (used below to indicate "automatic fragmentation"), |
953 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 954 | */ |
5cf121c3 | 955 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
956 | |
957 | /* process and remove the injection radiotap header */ | |
958 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
51fb61e7 | 959 | if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { |
9ae54c84 JB |
960 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
961 | return TX_DROP; | |
58d4185e | 962 | |
e2ebc74d | 963 | /* |
58d4185e JB |
964 | * __ieee80211_parse_tx_radiotap has now removed |
965 | * the radiotap header that was present and pre-filled | |
966 | * 'tx' with tx control information. | |
e2ebc74d | 967 | */ |
e2ebc74d JB |
968 | } |
969 | ||
58d4185e JB |
970 | hdr = (struct ieee80211_hdr *) skb->data; |
971 | ||
24338793 | 972 | tx->sta = sta_info_get(local, hdr->addr1); |
973 | tx->fc = le16_to_cpu(hdr->frame_control); | |
58d4185e | 974 | |
badffb72 | 975 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 976 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 977 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 978 | } else { |
5cf121c3 | 979 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 980 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 981 | } |
58d4185e | 982 | |
5cf121c3 JB |
983 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
984 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 985 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 RR |
986 | !local->ops->set_frag_threshold && |
987 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) | |
5cf121c3 | 988 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 989 | else |
5cf121c3 | 990 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
991 | } |
992 | ||
e2ebc74d | 993 | if (!tx->sta) |
e039fa4a | 994 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 995 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 996 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 997 | |
e2ebc74d JB |
998 | hdrlen = ieee80211_get_hdrlen(tx->fc); |
999 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { | |
1000 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1001 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1002 | } | |
e039fa4a | 1003 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1004 | |
9ae54c84 | 1005 | return TX_CONTINUE; |
e2ebc74d JB |
1006 | } |
1007 | ||
32bfd35d | 1008 | /* |
58d4185e JB |
1009 | * NB: @tx is uninitialised when passed in here |
1010 | */ | |
5cf121c3 | 1011 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e | 1012 | struct sk_buff *skb, |
e039fa4a | 1013 | struct net_device *mdev) |
e2ebc74d | 1014 | { |
e039fa4a | 1015 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1016 | struct net_device *dev; |
1017 | ||
e039fa4a | 1018 | dev = dev_get_by_index(&init_net, info->control.ifindex); |
e2ebc74d JB |
1019 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1020 | dev_put(dev); | |
1021 | dev = NULL; | |
1022 | } | |
1023 | if (unlikely(!dev)) | |
1024 | return -ENODEV; | |
58d4185e | 1025 | /* initialises tx with control */ |
e039fa4a | 1026 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1027 | dev_put(dev); |
e2ebc74d JB |
1028 | return 0; |
1029 | } | |
1030 | ||
1031 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1032 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1033 | { |
e039fa4a | 1034 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1035 | int ret, i; |
1036 | ||
e2530083 | 1037 | if (netif_subqueue_stopped(local->mdev, skb)) |
e2ebc74d | 1038 | return IEEE80211_TX_AGAIN; |
e2530083 | 1039 | |
e2ebc74d | 1040 | if (skb) { |
dd1cd4c6 JB |
1041 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
1042 | "TX to low-level driver", skb); | |
e039fa4a | 1043 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1044 | if (ret) |
1045 | return IEEE80211_TX_AGAIN; | |
1046 | local->mdev->trans_start = jiffies; | |
1047 | ieee80211_led_tx(local, 1); | |
1048 | } | |
5cf121c3 | 1049 | if (tx->extra_frag) { |
5cf121c3 JB |
1050 | for (i = 0; i < tx->num_extra_frag; i++) { |
1051 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1052 | continue; |
e039fa4a JB |
1053 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
1054 | info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS | | |
1055 | IEEE80211_TX_CTL_USE_CTS_PROTECT | | |
1056 | IEEE80211_TX_CTL_CLEAR_PS_FILT | | |
1057 | IEEE80211_TX_CTL_FIRST_FRAGMENT); | |
e2530083 JB |
1058 | if (netif_subqueue_stopped(local->mdev, |
1059 | tx->extra_frag[i])) | |
e2ebc74d | 1060 | return IEEE80211_TX_FRAG_AGAIN; |
5cf121c3 | 1061 | if (i == tx->num_extra_frag) { |
e039fa4a | 1062 | info->tx_rate_idx = tx->last_frag_rate_idx; |
8318d78a | 1063 | |
5cf121c3 | 1064 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e039fa4a JB |
1065 | info->flags |= |
1066 | IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 1067 | else |
e039fa4a JB |
1068 | info->flags &= |
1069 | ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d JB |
1070 | } |
1071 | ||
dd1cd4c6 | 1072 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
e2ebc74d | 1073 | "TX to low-level driver", |
5cf121c3 | 1074 | tx->extra_frag[i]); |
e2ebc74d | 1075 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1076 | tx->extra_frag[i]); |
e2ebc74d JB |
1077 | if (ret) |
1078 | return IEEE80211_TX_FRAG_AGAIN; | |
1079 | local->mdev->trans_start = jiffies; | |
1080 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1081 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1082 | } |
5cf121c3 JB |
1083 | kfree(tx->extra_frag); |
1084 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1085 | } |
1086 | return IEEE80211_TX_OK; | |
1087 | } | |
1088 | ||
97b045d6 JB |
1089 | /* |
1090 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1091 | * frame was dropped or queued. | |
1092 | */ | |
1093 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1094 | { | |
97b045d6 | 1095 | struct sk_buff *skb = tx->skb; |
97b045d6 JB |
1096 | ieee80211_tx_result res = TX_DROP; |
1097 | int i; | |
1098 | ||
d9e8a70f JB |
1099 | #define CALL_TXH(txh) \ |
1100 | res = txh(tx); \ | |
1101 | if (res != TX_CONTINUE) \ | |
1102 | goto txh_done; | |
1103 | ||
1104 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
1105 | CALL_TXH(ieee80211_tx_h_sequence) | |
1106 | CALL_TXH(ieee80211_tx_h_ps_buf) | |
1107 | CALL_TXH(ieee80211_tx_h_select_key) | |
1108 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1109 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1110 | CALL_TXH(ieee80211_tx_h_misc) | |
1111 | CALL_TXH(ieee80211_tx_h_fragment) | |
1112 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1113 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1114 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1115 | CALL_TXH(ieee80211_tx_h_stats) | |
1116 | #undef CALL_TXH | |
97b045d6 | 1117 | |
d9e8a70f | 1118 | txh_done: |
97b045d6 | 1119 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1120 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
97b045d6 JB |
1121 | dev_kfree_skb(skb); |
1122 | for (i = 0; i < tx->num_extra_frag; i++) | |
1123 | if (tx->extra_frag[i]) | |
1124 | dev_kfree_skb(tx->extra_frag[i]); | |
1125 | kfree(tx->extra_frag); | |
1126 | return -1; | |
1127 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1128 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1129 | return -1; |
1130 | } | |
1131 | ||
1132 | return 0; | |
1133 | } | |
1134 | ||
e039fa4a | 1135 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1136 | { |
1137 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1138 | struct sta_info *sta; | |
5cf121c3 | 1139 | struct ieee80211_tx_data tx; |
97b045d6 | 1140 | ieee80211_tx_result res_prepare; |
e039fa4a | 1141 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1142 | int ret, i; |
e2530083 | 1143 | u16 queue; |
e2ebc74d | 1144 | |
e2530083 JB |
1145 | queue = skb_get_queue_mapping(skb); |
1146 | ||
1147 | WARN_ON(test_bit(queue, local->queues_pending)); | |
e2ebc74d JB |
1148 | |
1149 | if (unlikely(skb->len < 10)) { | |
1150 | dev_kfree_skb(skb); | |
1151 | return 0; | |
1152 | } | |
1153 | ||
d0709a65 JB |
1154 | rcu_read_lock(); |
1155 | ||
58d4185e | 1156 | /* initialises tx */ |
e039fa4a | 1157 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1158 | |
9ae54c84 | 1159 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1160 | dev_kfree_skb(skb); |
d0709a65 | 1161 | rcu_read_unlock(); |
e2ebc74d JB |
1162 | return 0; |
1163 | } | |
1164 | ||
1165 | sta = tx.sta; | |
5cf121c3 | 1166 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1167 | info->band = tx.channel->band; |
e2ebc74d | 1168 | |
97b045d6 JB |
1169 | if (invoke_tx_handlers(&tx)) |
1170 | goto out; | |
e2ebc74d | 1171 | |
e2ebc74d JB |
1172 | retry: |
1173 | ret = __ieee80211_tx(local, skb, &tx); | |
1174 | if (ret) { | |
eefce91a JB |
1175 | struct ieee80211_tx_stored_packet *store; |
1176 | ||
1177 | /* | |
1178 | * Since there are no fragmented frames on A-MPDU | |
1179 | * queues, there's no reason for a driver to reject | |
1180 | * a frame there, warn and drop it. | |
1181 | */ | |
e2530083 | 1182 | if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw))) |
eefce91a JB |
1183 | goto drop; |
1184 | ||
1185 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1186 | |
1187 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1188 | skb = NULL; | |
e2530083 | 1189 | set_bit(queue, local->queues_pending); |
e2ebc74d | 1190 | smp_mb(); |
e2530083 JB |
1191 | /* |
1192 | * When the driver gets out of buffers during sending of | |
1193 | * fragments and calls ieee80211_stop_queue, the netif | |
1194 | * subqueue is stopped. There is, however, a small window | |
1195 | * in which the PENDING bit is not yet set. If a buffer | |
e2ebc74d JB |
1196 | * gets available in that window (i.e. driver calls |
1197 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
e2530083 | 1198 | * called with the PENDING bit still set. Prevent this by |
e2ebc74d | 1199 | * continuing transmitting here when that situation is |
e2530083 JB |
1200 | * possible to have happened. |
1201 | */ | |
1202 | if (!__netif_subqueue_stopped(local->mdev, queue)) { | |
1203 | clear_bit(queue, local->queues_pending); | |
e2ebc74d JB |
1204 | goto retry; |
1205 | } | |
e2ebc74d | 1206 | store->skb = skb; |
5cf121c3 JB |
1207 | store->extra_frag = tx.extra_frag; |
1208 | store->num_extra_frag = tx.num_extra_frag; | |
2e92e6f2 | 1209 | store->last_frag_rate_idx = tx.last_frag_rate_idx; |
badffb72 | 1210 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1211 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1212 | } |
97b045d6 | 1213 | out: |
d4e46a3d | 1214 | rcu_read_unlock(); |
e2ebc74d JB |
1215 | return 0; |
1216 | ||
1217 | drop: | |
1218 | if (skb) | |
1219 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1220 | for (i = 0; i < tx.num_extra_frag; i++) |
1221 | if (tx.extra_frag[i]) | |
1222 | dev_kfree_skb(tx.extra_frag[i]); | |
1223 | kfree(tx.extra_frag); | |
d4e46a3d | 1224 | rcu_read_unlock(); |
e2ebc74d JB |
1225 | return 0; |
1226 | } | |
1227 | ||
1228 | /* device xmit handlers */ | |
1229 | ||
23c0752a JB |
1230 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1231 | struct sk_buff *skb, | |
1232 | int head_need, bool may_encrypt) | |
1233 | { | |
1234 | int tail_need = 0; | |
1235 | ||
1236 | /* | |
1237 | * This could be optimised, devices that do full hardware | |
1238 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1239 | * have no drivers for such devices currently. | |
1240 | */ | |
1241 | if (may_encrypt) { | |
1242 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1243 | tail_need -= skb_tailroom(skb); | |
1244 | tail_need = max_t(int, tail_need, 0); | |
1245 | } | |
1246 | ||
1247 | if (head_need || tail_need) { | |
1248 | /* Sorry. Can't account for this any more */ | |
1249 | skb_orphan(skb); | |
1250 | } | |
1251 | ||
1252 | if (skb_header_cloned(skb)) | |
1253 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1254 | else | |
1255 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1256 | ||
1257 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1258 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1259 | wiphy_name(local->hw.wiphy)); | |
1260 | return -ENOMEM; | |
1261 | } | |
1262 | ||
1263 | /* update truesize too */ | |
1264 | skb->truesize += head_need + tail_need; | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
e2ebc74d JB |
1269 | int ieee80211_master_start_xmit(struct sk_buff *skb, |
1270 | struct net_device *dev) | |
1271 | { | |
e039fa4a | 1272 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1273 | struct net_device *odev = NULL; |
1274 | struct ieee80211_sub_if_data *osdata; | |
1275 | int headroom; | |
23c0752a | 1276 | bool may_encrypt; |
e2ebc74d JB |
1277 | int ret; |
1278 | ||
e039fa4a JB |
1279 | if (info->control.ifindex) |
1280 | odev = dev_get_by_index(&init_net, info->control.ifindex); | |
e2ebc74d JB |
1281 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1282 | dev_put(odev); | |
1283 | odev = NULL; | |
1284 | } | |
1285 | if (unlikely(!odev)) { | |
1286 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1287 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1288 | "originating device\n", dev->name); | |
1289 | #endif | |
1290 | dev_kfree_skb(skb); | |
1291 | return 0; | |
1292 | } | |
e039fa4a | 1293 | |
e2ebc74d JB |
1294 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1295 | ||
23c0752a JB |
1296 | may_encrypt = !(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT); |
1297 | ||
1298 | headroom = osdata->local->tx_headroom; | |
1299 | if (may_encrypt) | |
1300 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1301 | headroom -= skb_headroom(skb); | |
1302 | headroom = max_t(int, 0, headroom); | |
1303 | ||
1304 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1305 | dev_kfree_skb(skb); | |
1306 | dev_put(odev); | |
1307 | return 0; | |
e2ebc74d JB |
1308 | } |
1309 | ||
e039fa4a JB |
1310 | info->control.vif = &osdata->vif; |
1311 | ret = ieee80211_tx(odev, skb); | |
e2ebc74d JB |
1312 | dev_put(odev); |
1313 | ||
1314 | return ret; | |
1315 | } | |
1316 | ||
1317 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1318 | struct net_device *dev) | |
1319 | { | |
1320 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e039fa4a | 1321 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
1322 | struct ieee80211_radiotap_header *prthdr = |
1323 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1324 | u16 len_rthdr; |
e2ebc74d | 1325 | |
9b8a74e3 AG |
1326 | /* check for not even having the fixed radiotap header part */ |
1327 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1328 | goto fail; /* too short to be possibly valid */ | |
1329 | ||
1330 | /* is it a header version we can trust to find length from? */ | |
1331 | if (unlikely(prthdr->it_version)) | |
1332 | goto fail; /* only version 0 is supported */ | |
1333 | ||
1334 | /* then there must be a radiotap header with a length we can use */ | |
1335 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1336 | ||
1337 | /* does the skb contain enough to deliver on the alleged length? */ | |
1338 | if (unlikely(skb->len < len_rthdr)) | |
1339 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1340 | |
1341 | skb->dev = local->mdev; | |
1342 | ||
9b8a74e3 | 1343 | /* needed because we set skb device to master */ |
e039fa4a | 1344 | info->control.ifindex = dev->ifindex; |
9b8a74e3 | 1345 | |
e039fa4a | 1346 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; |
b0a67179 | 1347 | /* Interfaces should always request a status report */ |
e039fa4a | 1348 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
e2ebc74d | 1349 | |
e2ebc74d JB |
1350 | /* |
1351 | * fix up the pointers accounting for the radiotap | |
1352 | * header still being in there. We are being given | |
1353 | * a precooked IEEE80211 header so no need for | |
1354 | * normal processing | |
1355 | */ | |
9b8a74e3 | 1356 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1357 | /* |
9b8a74e3 AG |
1358 | * these are just fixed to the end of the rt area since we |
1359 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1360 | */ |
9b8a74e3 AG |
1361 | skb_set_network_header(skb, len_rthdr); |
1362 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1363 | |
9b8a74e3 AG |
1364 | /* pass the radiotap header up to the next stage intact */ |
1365 | dev_queue_xmit(skb); | |
e2ebc74d | 1366 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1367 | |
1368 | fail: | |
1369 | dev_kfree_skb(skb); | |
1370 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1371 | } |
1372 | ||
1373 | /** | |
1374 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1375 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1376 | * @skb: packet to be sent | |
1377 | * @dev: incoming interface | |
1378 | * | |
1379 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1380 | * not be freed, and caller is responsible for either retrying later or freeing | |
1381 | * skb). | |
1382 | * | |
1383 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1384 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1385 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1386 | * transmission (through low-level driver). | |
1387 | */ | |
1388 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1389 | struct net_device *dev) | |
1390 | { | |
1391 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e039fa4a | 1392 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1393 | struct ieee80211_sub_if_data *sdata; |
1394 | int ret = 1, head_need; | |
065e9605 HH |
1395 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1396 | __le16 fc; | |
e2ebc74d | 1397 | struct ieee80211_hdr hdr; |
33b64eb2 | 1398 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1399 | const u8 *encaps_data; |
1400 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1401 | int nh_pos, h_pos; |
e2ebc74d | 1402 | struct sta_info *sta; |
ce3edf6d | 1403 | u32 sta_flags = 0; |
e2ebc74d JB |
1404 | |
1405 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1406 | if (unlikely(skb->len < ETH_HLEN)) { | |
1407 | printk(KERN_DEBUG "%s: short skb (len=%d)\n", | |
1408 | dev->name, skb->len); | |
1409 | ret = 0; | |
1410 | goto fail; | |
1411 | } | |
1412 | ||
1413 | nh_pos = skb_network_header(skb) - skb->data; | |
1414 | h_pos = skb_transport_header(skb) - skb->data; | |
1415 | ||
1416 | /* convert Ethernet header to proper 802.11 header (based on | |
1417 | * operation mode) */ | |
1418 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1419 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1420 | |
51fb61e7 | 1421 | switch (sdata->vif.type) { |
cf966838 JB |
1422 | case IEEE80211_IF_TYPE_AP: |
1423 | case IEEE80211_IF_TYPE_VLAN: | |
065e9605 | 1424 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1425 | /* DA BSSID SA */ |
1426 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1427 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1428 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1429 | hdrlen = 24; | |
cf966838 JB |
1430 | break; |
1431 | case IEEE80211_IF_TYPE_WDS: | |
065e9605 | 1432 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1433 | /* RA TA DA SA */ |
1434 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1435 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1436 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1437 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1438 | hdrlen = 30; | |
cf966838 | 1439 | break; |
33b64eb2 LCC |
1440 | #ifdef CONFIG_MAC80211_MESH |
1441 | case IEEE80211_IF_TYPE_MESH_POINT: | |
065e9605 | 1442 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
33b64eb2 LCC |
1443 | /* RA TA DA SA */ |
1444 | if (is_multicast_ether_addr(skb->data)) | |
1445 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1446 | else if (mesh_nexthop_lookup(hdr.addr1, skb, dev)) | |
1447 | return 0; | |
1448 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1449 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1450 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1451 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
1452 | /* Forwarded frame, keep mesh ttl and seqnum */ | |
1453 | struct ieee80211s_hdr *prev_meshhdr; | |
1454 | prev_meshhdr = ((struct ieee80211s_hdr *)skb->cb); | |
1455 | meshhdrlen = ieee80211_get_mesh_hdrlen(prev_meshhdr); | |
1456 | memcpy(&mesh_hdr, prev_meshhdr, meshhdrlen); | |
1457 | sdata->u.sta.mshstats.fwded_frames++; | |
1458 | } else { | |
1459 | if (!sdata->u.sta.mshcfg.dot11MeshTTL) { | |
1460 | /* Do not send frames with mesh_ttl == 0 */ | |
1461 | sdata->u.sta.mshstats.dropped_frames_ttl++; | |
1462 | ret = 0; | |
1463 | goto fail; | |
1464 | } | |
1465 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, | |
902acc78 | 1466 | sdata); |
33b64eb2 LCC |
1467 | } |
1468 | hdrlen = 30; | |
1469 | break; | |
1470 | #endif | |
cf966838 | 1471 | case IEEE80211_IF_TYPE_STA: |
065e9605 | 1472 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1473 | /* BSSID SA DA */ |
1474 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1475 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1476 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1477 | hdrlen = 24; | |
cf966838 JB |
1478 | break; |
1479 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1480 | /* DA SA BSSID */ |
1481 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1482 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1483 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1484 | hdrlen = 24; | |
cf966838 JB |
1485 | break; |
1486 | default: | |
e2ebc74d JB |
1487 | ret = 0; |
1488 | goto fail; | |
1489 | } | |
1490 | ||
7d185b8b JB |
1491 | /* |
1492 | * There's no need to try to look up the destination | |
1493 | * if it is a multicast address (which can only happen | |
1494 | * in AP mode) | |
1495 | */ | |
1496 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1497 | rcu_read_lock(); |
7d185b8b | 1498 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1499 | if (sta) |
07346f81 | 1500 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1501 | rcu_read_unlock(); |
e2ebc74d JB |
1502 | } |
1503 | ||
3434fbd3 | 1504 | /* receiver and we are QoS enabled, use a QoS type frame */ |
e2530083 JB |
1505 | if (sta_flags & WLAN_STA_WME && |
1506 | ieee80211_num_regular_queues(&local->hw) >= 4) { | |
065e9605 | 1507 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1508 | hdrlen += 2; |
1509 | } | |
1510 | ||
1511 | /* | |
238814fd JB |
1512 | * Drop unicast frames to unauthorised stations unless they are |
1513 | * EAPOL frames from the local station. | |
ce3edf6d | 1514 | */ |
238814fd | 1515 | if (unlikely(!is_multicast_ether_addr(hdr.addr1) && |
33b64eb2 LCC |
1516 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1517 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1518 | compare_ether_addr(dev->dev_addr, |
1519 | skb->data + ETH_ALEN) == 0))) { | |
1520 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1521 | DECLARE_MAC_BUF(mac); | |
1522 | ||
1523 | if (net_ratelimit()) | |
1524 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1525 | " (unauthorized port)\n", dev->name, | |
1526 | print_mac(mac, hdr.addr1)); | |
1527 | #endif | |
1528 | ||
1529 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1530 | ||
1531 | ret = 0; | |
1532 | goto fail; | |
1533 | } | |
1534 | ||
065e9605 | 1535 | hdr.frame_control = fc; |
e2ebc74d JB |
1536 | hdr.duration_id = 0; |
1537 | hdr.seq_ctrl = 0; | |
1538 | ||
1539 | skip_header_bytes = ETH_HLEN; | |
1540 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1541 | encaps_data = bridge_tunnel_header; | |
1542 | encaps_len = sizeof(bridge_tunnel_header); | |
1543 | skip_header_bytes -= 2; | |
1544 | } else if (ethertype >= 0x600) { | |
1545 | encaps_data = rfc1042_header; | |
1546 | encaps_len = sizeof(rfc1042_header); | |
1547 | skip_header_bytes -= 2; | |
1548 | } else { | |
1549 | encaps_data = NULL; | |
1550 | encaps_len = 0; | |
1551 | } | |
1552 | ||
1553 | skb_pull(skb, skip_header_bytes); | |
1554 | nh_pos -= skip_header_bytes; | |
1555 | h_pos -= skip_header_bytes; | |
1556 | ||
1557 | /* TODO: implement support for fragments so that there is no need to | |
1558 | * reallocate and copy payload; it might be enough to support one | |
1559 | * extra fragment that would be copied in the beginning of the frame | |
1560 | * data.. anyway, it would be nice to include this into skb structure | |
1561 | * somehow | |
1562 | * | |
1563 | * There are few options for this: | |
1564 | * use skb->cb as an extra space for 802.11 header | |
1565 | * allocate new buffer if not enough headroom | |
1566 | * make sure that there is enough headroom in every skb by increasing | |
1567 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1568 | * alloc_skb() (net/core/skbuff.c) | |
1569 | */ | |
23c0752a | 1570 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1571 | |
23c0752a JB |
1572 | /* |
1573 | * So we need to modify the skb header and hence need a copy of | |
1574 | * that. The head_need variable above doesn't, so far, include | |
1575 | * the needed header space that we don't need right away. If we | |
1576 | * can, then we don't reallocate right now but only after the | |
1577 | * frame arrives at the master device (if it does...) | |
1578 | * | |
1579 | * If we cannot, however, then we will reallocate to include all | |
1580 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1581 | * make it big enough for everything we may ever need. | |
1582 | */ | |
e2ebc74d | 1583 | |
3a5be7d4 | 1584 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1585 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1586 | head_need += local->tx_headroom; | |
1587 | head_need = max_t(int, 0, head_need); | |
1588 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1589 | goto fail; |
e2ebc74d JB |
1590 | } |
1591 | ||
1592 | if (encaps_data) { | |
1593 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1594 | nh_pos += encaps_len; | |
1595 | h_pos += encaps_len; | |
1596 | } | |
c29b9b9b | 1597 | |
33b64eb2 LCC |
1598 | if (meshhdrlen > 0) { |
1599 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1600 | nh_pos += meshhdrlen; | |
1601 | h_pos += meshhdrlen; | |
1602 | } | |
1603 | ||
065e9605 | 1604 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1605 | __le16 *qos_control; |
1606 | ||
1607 | qos_control = (__le16*) skb_push(skb, 2); | |
1608 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1609 | /* | |
1610 | * Maybe we could actually set some fields here, for now just | |
1611 | * initialise to zero to indicate no special operation. | |
1612 | */ | |
1613 | *qos_control = 0; | |
1614 | } else | |
1615 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1616 | ||
e2ebc74d JB |
1617 | nh_pos += hdrlen; |
1618 | h_pos += hdrlen; | |
1619 | ||
e039fa4a JB |
1620 | info = IEEE80211_SKB_CB(skb); |
1621 | memset(info, 0, sizeof(*info)); | |
1622 | info->control.ifindex = dev->ifindex; | |
678f5f71 | 1623 | if (ethertype == ETH_P_PAE) |
e039fa4a | 1624 | info->flags |= IEEE80211_TX_CTL_EAPOL_FRAME; |
e2ebc74d | 1625 | |
b0a67179 | 1626 | /* Interfaces should always request a status report */ |
e039fa4a | 1627 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
b0a67179 | 1628 | |
e2ebc74d | 1629 | skb->dev = local->mdev; |
68aae116 SH |
1630 | dev->stats.tx_packets++; |
1631 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1632 | |
1633 | /* Update skb pointers to various headers since this modified frame | |
1634 | * is going to go through Linux networking code that may potentially | |
1635 | * need things like pointer to IP header. */ | |
1636 | skb_set_mac_header(skb, 0); | |
1637 | skb_set_network_header(skb, nh_pos); | |
1638 | skb_set_transport_header(skb, h_pos); | |
1639 | ||
1640 | dev->trans_start = jiffies; | |
1641 | dev_queue_xmit(skb); | |
1642 | ||
1643 | return 0; | |
1644 | ||
1645 | fail: | |
1646 | if (!ret) | |
1647 | dev_kfree_skb(skb); | |
1648 | ||
1649 | return ret; | |
1650 | } | |
1651 | ||
e2ebc74d | 1652 | |
e2530083 JB |
1653 | /* |
1654 | * ieee80211_clear_tx_pending may not be called in a context where | |
1655 | * it is possible that it packets could come in again. | |
1656 | */ | |
e2ebc74d JB |
1657 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1658 | { | |
1659 | int i, j; | |
1660 | struct ieee80211_tx_stored_packet *store; | |
1661 | ||
e2530083 JB |
1662 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1663 | if (!test_bit(i, local->queues_pending)) | |
e2ebc74d JB |
1664 | continue; |
1665 | store = &local->pending_packet[i]; | |
1666 | kfree_skb(store->skb); | |
1667 | for (j = 0; j < store->num_extra_frag; j++) | |
1668 | kfree_skb(store->extra_frag[j]); | |
1669 | kfree(store->extra_frag); | |
e2530083 | 1670 | clear_bit(i, local->queues_pending); |
e2ebc74d JB |
1671 | } |
1672 | } | |
1673 | ||
e2530083 JB |
1674 | /* |
1675 | * Transmit all pending packets. Called from tasklet, locks master device | |
1676 | * TX lock so that no new packets can come in. | |
1677 | */ | |
e2ebc74d JB |
1678 | void ieee80211_tx_pending(unsigned long data) |
1679 | { | |
1680 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1681 | struct net_device *dev = local->mdev; | |
1682 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1683 | struct ieee80211_tx_data tx; |
e2530083 | 1684 | int i, ret; |
e2ebc74d JB |
1685 | |
1686 | netif_tx_lock_bh(dev); | |
e2530083 JB |
1687 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1688 | /* Check that this queue is ok */ | |
1689 | if (__netif_subqueue_stopped(local->mdev, i)) | |
e2ebc74d | 1690 | continue; |
e2530083 JB |
1691 | |
1692 | if (!test_bit(i, local->queues_pending)) { | |
1693 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1694 | continue; |
1695 | } | |
e2530083 | 1696 | |
e2ebc74d | 1697 | store = &local->pending_packet[i]; |
5cf121c3 JB |
1698 | tx.extra_frag = store->extra_frag; |
1699 | tx.num_extra_frag = store->num_extra_frag; | |
2e92e6f2 | 1700 | tx.last_frag_rate_idx = store->last_frag_rate_idx; |
badffb72 JS |
1701 | tx.flags = 0; |
1702 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1703 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1704 | ret = __ieee80211_tx(local, store->skb, &tx); |
1705 | if (ret) { | |
1706 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1707 | store->skb = NULL; | |
1708 | } else { | |
e2530083 JB |
1709 | clear_bit(i, local->queues_pending); |
1710 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1711 | } |
1712 | } | |
1713 | netif_tx_unlock_bh(dev); | |
e2ebc74d JB |
1714 | } |
1715 | ||
1716 | /* functions for drivers to get certain frames */ | |
1717 | ||
1718 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1719 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1720 | struct sk_buff *skb, |
1721 | struct beacon_data *beacon) | |
e2ebc74d JB |
1722 | { |
1723 | u8 *pos, *tim; | |
1724 | int aid0 = 0; | |
1725 | int i, have_bits = 0, n1, n2; | |
1726 | ||
1727 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1728 | * mode. */ | |
e2ebc74d JB |
1729 | if (atomic_read(&bss->num_sta_ps) > 0) |
1730 | /* in the hope that this is faster than | |
1731 | * checking byte-for-byte */ | |
1732 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1733 | IEEE80211_MAX_AID+1); | |
1734 | ||
1735 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1736 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1737 | else |
1738 | bss->dtim_count--; | |
1739 | ||
1740 | tim = pos = (u8 *) skb_put(skb, 6); | |
1741 | *pos++ = WLAN_EID_TIM; | |
1742 | *pos++ = 4; | |
1743 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1744 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1745 | |
1746 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1747 | aid0 = 1; | |
1748 | ||
1749 | if (have_bits) { | |
1750 | /* Find largest even number N1 so that bits numbered 1 through | |
1751 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1752 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1753 | n1 = 0; | |
1754 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1755 | if (bss->tim[i]) { | |
1756 | n1 = i & 0xfe; | |
1757 | break; | |
1758 | } | |
1759 | } | |
1760 | n2 = n1; | |
1761 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1762 | if (bss->tim[i]) { | |
1763 | n2 = i; | |
1764 | break; | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | /* Bitmap control */ | |
1769 | *pos++ = n1 | aid0; | |
1770 | /* Part Virt Bitmap */ | |
1771 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1772 | ||
1773 | tim[1] = n2 - n1 + 4; | |
1774 | skb_put(skb, n2 - n1); | |
1775 | } else { | |
1776 | *pos++ = aid0; /* Bitmap control */ | |
1777 | *pos++ = 0; /* Part Virt Bitmap */ | |
1778 | } | |
e2ebc74d JB |
1779 | } |
1780 | ||
32bfd35d | 1781 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1782 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1783 | { |
1784 | struct ieee80211_local *local = hw_to_local(hw); | |
1785 | struct sk_buff *skb; | |
e039fa4a | 1786 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1787 | struct net_device *bdev; |
1788 | struct ieee80211_sub_if_data *sdata = NULL; | |
1789 | struct ieee80211_if_ap *ap = NULL; | |
1abbe498 | 1790 | struct rate_selection rsel; |
5dfdaf58 | 1791 | struct beacon_data *beacon; |
8318d78a | 1792 | struct ieee80211_supported_band *sband; |
902acc78 | 1793 | struct ieee80211_mgmt *mgmt; |
33b64eb2 | 1794 | int *num_beacons; |
902acc78 | 1795 | bool err = true; |
2e92e6f2 | 1796 | enum ieee80211_band band = local->hw.conf.channel->band; |
902acc78 | 1797 | u8 *pos; |
8318d78a | 1798 | |
2e92e6f2 | 1799 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1800 | |
1801 | rcu_read_lock(); | |
e2ebc74d | 1802 | |
32bfd35d JB |
1803 | sdata = vif_to_sdata(vif); |
1804 | bdev = sdata->dev; | |
e2ebc74d | 1805 | |
902acc78 | 1806 | if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
33b64eb2 LCC |
1807 | ap = &sdata->u.ap; |
1808 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1809 | if (ap && beacon) { |
1810 | /* | |
1811 | * headroom, head length, | |
1812 | * tail length and maximum TIM length | |
1813 | */ | |
1814 | skb = dev_alloc_skb(local->tx_headroom + | |
1815 | beacon->head_len + | |
1816 | beacon->tail_len + 256); | |
1817 | if (!skb) | |
1818 | goto out; | |
33b64eb2 | 1819 | |
902acc78 JB |
1820 | skb_reserve(skb, local->tx_headroom); |
1821 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1822 | beacon->head_len); | |
33b64eb2 | 1823 | |
902acc78 JB |
1824 | ieee80211_include_sequence(sdata, |
1825 | (struct ieee80211_hdr *)skb->data); | |
33b64eb2 | 1826 | |
d0709a65 JB |
1827 | /* |
1828 | * Not very nice, but we want to allow the driver to call | |
1829 | * ieee80211_beacon_get() as a response to the set_tim() | |
1830 | * callback. That, however, is already invoked under the | |
1831 | * sta_lock to guarantee consistent and race-free update | |
1832 | * of the tim bitmap in mac80211 and the driver. | |
1833 | */ | |
1834 | if (local->tim_in_locked_section) { | |
1835 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1836 | } else { | |
1837 | unsigned long flags; | |
1838 | ||
1839 | spin_lock_irqsave(&local->sta_lock, flags); | |
1840 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1841 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1842 | } | |
33b64eb2 | 1843 | |
902acc78 JB |
1844 | if (beacon->tail) |
1845 | memcpy(skb_put(skb, beacon->tail_len), | |
1846 | beacon->tail, beacon->tail_len); | |
33b64eb2 | 1847 | |
902acc78 | 1848 | num_beacons = &ap->num_beacons; |
33b64eb2 | 1849 | |
902acc78 JB |
1850 | err = false; |
1851 | } | |
1852 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
1853 | /* headroom, head length, tail length and maximum TIM length */ | |
1854 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1855 | if (!skb) | |
1856 | goto out; | |
1857 | ||
1858 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1859 | mgmt = (struct ieee80211_mgmt *) | |
1860 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1861 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
1862 | mgmt->frame_control = |
1863 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
1864 | memset(mgmt->da, 0xff, ETH_ALEN); |
1865 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1866 | /* BSSID is left zeroed, wildcard value */ | |
1867 | mgmt->u.beacon.beacon_int = | |
1868 | cpu_to_le16(local->hw.conf.beacon_int); | |
1869 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1870 | ||
1871 | pos = skb_put(skb, 2); | |
1872 | *pos++ = WLAN_EID_SSID; | |
1873 | *pos++ = 0x0; | |
1874 | ||
1875 | mesh_mgmt_ies_add(skb, sdata->dev); | |
33b64eb2 | 1876 | |
33b64eb2 | 1877 | num_beacons = &sdata->u.sta.num_beacons; |
33b64eb2 | 1878 | |
902acc78 | 1879 | err = false; |
33b64eb2 | 1880 | } |
5dfdaf58 | 1881 | |
33b64eb2 | 1882 | if (err) { |
e2ebc74d JB |
1883 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1884 | if (net_ratelimit()) | |
32bfd35d JB |
1885 | printk(KERN_DEBUG "no beacon data avail for %s\n", |
1886 | bdev->name); | |
e2ebc74d | 1887 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
5dfdaf58 JB |
1888 | skb = NULL; |
1889 | goto out; | |
e2ebc74d JB |
1890 | } |
1891 | ||
e039fa4a JB |
1892 | info = IEEE80211_SKB_CB(skb); |
1893 | ||
1894 | info->band = band; | |
1895 | rate_control_get_rate(local->mdev, sband, skb, &rsel); | |
e2ebc74d | 1896 | |
e039fa4a JB |
1897 | if (unlikely(rsel.rate_idx < 0)) { |
1898 | if (net_ratelimit()) { | |
1899 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " | |
1900 | "no rate found\n", | |
1901 | wiphy_name(local->hw.wiphy)); | |
1902 | } | |
1903 | dev_kfree_skb(skb); | |
1904 | skb = NULL; | |
1905 | goto out; | |
e2ebc74d | 1906 | } |
e039fa4a JB |
1907 | |
1908 | info->control.vif = vif; | |
1909 | info->tx_rate_idx = rsel.rate_idx; | |
1910 | if (sdata->bss_conf.use_short_preamble && | |
1911 | sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1912 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; | |
1913 | info->antenna_sel_tx = local->hw.conf.antenna_sel_tx; | |
1914 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1915 | info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT; | |
1916 | info->control.retry_limit = 1; | |
1917 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; | |
33b64eb2 LCC |
1918 | (*num_beacons)++; |
1919 | out: | |
5dfdaf58 | 1920 | rcu_read_unlock(); |
e2ebc74d JB |
1921 | return skb; |
1922 | } | |
1923 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1924 | ||
32bfd35d | 1925 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1926 | const void *frame, size_t frame_len, |
e039fa4a | 1927 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1928 | struct ieee80211_rts *rts) |
1929 | { | |
1930 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1931 | |
065e9605 HH |
1932 | rts->frame_control = |
1933 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
1934 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1935 | frame_txctl); | |
e2ebc74d JB |
1936 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1937 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1938 | } | |
1939 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1940 | ||
32bfd35d | 1941 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1942 | const void *frame, size_t frame_len, |
e039fa4a | 1943 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1944 | struct ieee80211_cts *cts) |
1945 | { | |
1946 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1947 | |
065e9605 HH |
1948 | cts->frame_control = |
1949 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
1950 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1951 | frame_len, frame_txctl); | |
e2ebc74d JB |
1952 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1953 | } | |
1954 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1955 | ||
1956 | struct sk_buff * | |
32bfd35d | 1957 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 1958 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1959 | { |
1960 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 1961 | struct sk_buff *skb = NULL; |
e2ebc74d | 1962 | struct sta_info *sta; |
5cf121c3 | 1963 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
1964 | struct net_device *bdev; |
1965 | struct ieee80211_sub_if_data *sdata; | |
1966 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 1967 | struct beacon_data *beacon; |
e039fa4a | 1968 | struct ieee80211_tx_info *info; |
e2ebc74d | 1969 | |
32bfd35d JB |
1970 | sdata = vif_to_sdata(vif); |
1971 | bdev = sdata->dev; | |
747cf5e9 | 1972 | bss = &sdata->u.ap; |
5dfdaf58 JB |
1973 | |
1974 | if (!bss) | |
e2ebc74d JB |
1975 | return NULL; |
1976 | ||
5dfdaf58 JB |
1977 | rcu_read_lock(); |
1978 | beacon = rcu_dereference(bss->beacon); | |
1979 | ||
747cf5e9 TW |
1980 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || !beacon->head) |
1981 | goto out; | |
5dfdaf58 | 1982 | |
e2ebc74d | 1983 | if (bss->dtim_count != 0) |
747cf5e9 | 1984 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 1985 | |
e2ebc74d JB |
1986 | while (1) { |
1987 | skb = skb_dequeue(&bss->ps_bc_buf); | |
1988 | if (!skb) | |
747cf5e9 | 1989 | goto out; |
e2ebc74d JB |
1990 | local->total_ps_buffered--; |
1991 | ||
1992 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
1993 | struct ieee80211_hdr *hdr = | |
1994 | (struct ieee80211_hdr *) skb->data; | |
1995 | /* more buffered multicast/broadcast frames ==> set | |
1996 | * MoreData flag in IEEE 802.11 header to inform PS | |
1997 | * STAs */ | |
1998 | hdr->frame_control |= | |
1999 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2000 | } | |
2001 | ||
e039fa4a | 2002 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev)) |
e2ebc74d JB |
2003 | break; |
2004 | dev_kfree_skb_any(skb); | |
2005 | } | |
e039fa4a JB |
2006 | |
2007 | info = IEEE80211_SKB_CB(skb); | |
2008 | ||
e2ebc74d | 2009 | sta = tx.sta; |
5cf121c3 JB |
2010 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2011 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2012 | info->band = tx.channel->band; |
e2ebc74d | 2013 | |
97b045d6 | 2014 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2015 | skb = NULL; |
97b045d6 | 2016 | out: |
d0709a65 | 2017 | rcu_read_unlock(); |
e2ebc74d JB |
2018 | |
2019 | return skb; | |
2020 | } | |
2021 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |