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; |
358c8d9d | 85 | struct ieee80211_hdr *hdr; |
e2ebc74d | 86 | |
2e92e6f2 JB |
87 | sband = local->hw.wiphy->bands[tx->channel->band]; |
88 | txrate = &sband->bitrates[tx->rate_idx]; | |
8318d78a JB |
89 | |
90 | erp = 0; | |
91 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
92 | erp = txrate->flags & IEEE80211_RATE_ERP_G; | |
e2ebc74d JB |
93 | |
94 | /* | |
95 | * data and mgmt (except PS Poll): | |
96 | * - during CFP: 32768 | |
97 | * - during contention period: | |
98 | * if addr1 is group address: 0 | |
99 | * if more fragments = 0 and addr1 is individual address: time to | |
100 | * transmit one ACK plus SIFS | |
101 | * if more fragments = 1 and addr1 is individual address: time to | |
102 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
103 | * | |
104 | * IEEE 802.11, 9.6: | |
105 | * - control response frame (CTS or ACK) shall be transmitted using the | |
106 | * same rate as the immediately previous frame in the frame exchange | |
107 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
108 | * at the highest possible rate belonging to the PHY rates in the | |
109 | * BSSBasicRateSet | |
110 | */ | |
358c8d9d HH |
111 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
112 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d JB |
113 | /* TODO: These control frames are not currently sent by |
114 | * 80211.o, but should they be implemented, this function | |
115 | * needs to be updated to support duration field calculation. | |
116 | * | |
117 | * RTS: time needed to transmit pending data/mgmt frame plus | |
118 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
119 | * CTS: duration of immediately previous RTS minus time | |
120 | * required to transmit CTS and its SIFS | |
121 | * ACK: 0 if immediately previous directed data/mgmt had | |
122 | * more=0, with more=1 duration in ACK frame is duration | |
123 | * from previous frame minus time needed to transmit ACK | |
124 | * and its SIFS | |
125 | * PS Poll: BIT(15) | BIT(14) | aid | |
126 | */ | |
127 | return 0; | |
128 | } | |
129 | ||
130 | /* data/mgmt */ | |
131 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 132 | return cpu_to_le16(32768); |
e2ebc74d JB |
133 | |
134 | if (group_addr) /* Group address as the destination - no ACK */ | |
135 | return 0; | |
136 | ||
137 | /* Individual destination address: | |
138 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
139 | * CTS and ACK frames shall be transmitted using the highest rate in | |
140 | * basic rate set that is less than or equal to the rate of the | |
141 | * immediately previous frame and that is using the same modulation | |
142 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
143 | * the highest mandatory rate of the PHY that is less than or equal to | |
144 | * the rate of the previous frame is used. | |
145 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
146 | */ | |
147 | rate = -1; | |
8318d78a JB |
148 | /* use lowest available if everything fails */ |
149 | mrate = sband->bitrates[0].bitrate; | |
150 | for (i = 0; i < sband->n_bitrates; i++) { | |
151 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 152 | |
8318d78a JB |
153 | if (r->bitrate > txrate->bitrate) |
154 | break; | |
e2ebc74d | 155 | |
8318d78a JB |
156 | if (tx->sdata->basic_rates & BIT(i)) |
157 | rate = r->bitrate; | |
158 | ||
159 | switch (sband->band) { | |
160 | case IEEE80211_BAND_2GHZ: { | |
161 | u32 flag; | |
162 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
163 | flag = IEEE80211_RATE_MANDATORY_G; | |
164 | else | |
165 | flag = IEEE80211_RATE_MANDATORY_B; | |
166 | if (r->flags & flag) | |
167 | mrate = r->bitrate; | |
168 | break; | |
169 | } | |
170 | case IEEE80211_BAND_5GHZ: | |
171 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
172 | mrate = r->bitrate; | |
173 | break; | |
174 | case IEEE80211_NUM_BANDS: | |
175 | WARN_ON(1); | |
176 | break; | |
177 | } | |
e2ebc74d JB |
178 | } |
179 | if (rate == -1) { | |
180 | /* No matching basic rate found; use highest suitable mandatory | |
181 | * PHY rate */ | |
182 | rate = mrate; | |
183 | } | |
184 | ||
185 | /* Time needed to transmit ACK | |
186 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
187 | * to closest integer */ | |
188 | ||
189 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
471b3efd | 190 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
191 | |
192 | if (next_frag_len) { | |
193 | /* Frame is fragmented: duration increases with time needed to | |
194 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
195 | dur *= 2; /* ACK + SIFS */ | |
196 | /* next fragment */ | |
197 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 198 | txrate->bitrate, erp, |
471b3efd | 199 | tx->sdata->bss_conf.use_short_preamble); |
e2ebc74d JB |
200 | } |
201 | ||
03f93c3d | 202 | return cpu_to_le16(dur); |
e2ebc74d JB |
203 | } |
204 | ||
e2ebc74d JB |
205 | static int inline is_ieee80211_device(struct net_device *dev, |
206 | struct net_device *master) | |
207 | { | |
208 | return (wdev_priv(dev->ieee80211_ptr) == | |
209 | wdev_priv(master->ieee80211_ptr)); | |
210 | } | |
211 | ||
212 | /* tx handlers */ | |
213 | ||
d9e8a70f | 214 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 215 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 216 | { |
358c8d9d | 217 | |
e039fa4a | 218 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
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) && |
358c8d9d | 226 | !ieee80211_is_probe_req(hdr->frame_control)) |
9ae54c84 | 227 | return TX_DROP; |
e2ebc74d | 228 | |
33b64eb2 LCC |
229 | if (tx->sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) |
230 | return TX_CONTINUE; | |
231 | ||
5cf121c3 | 232 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 233 | return TX_CONTINUE; |
e2ebc74d | 234 | |
07346f81 | 235 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 236 | |
5cf121c3 | 237 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 238 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
51fb61e7 | 239 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
358c8d9d | 240 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d | 241 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0795af57 | 242 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 243 | printk(KERN_DEBUG "%s: dropped data frame to not " |
0795af57 JP |
244 | "associated station %s\n", |
245 | tx->dev->name, print_mac(mac, hdr->addr1)); | |
e2ebc74d JB |
246 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
247 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 248 | return TX_DROP; |
e2ebc74d JB |
249 | } |
250 | } else { | |
358c8d9d | 251 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 252 | tx->local->num_sta == 0 && |
51fb61e7 | 253 | tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) { |
e2ebc74d JB |
254 | /* |
255 | * No associated STAs - no need to send multicast | |
256 | * frames. | |
257 | */ | |
9ae54c84 | 258 | return TX_DROP; |
e2ebc74d | 259 | } |
9ae54c84 | 260 | return TX_CONTINUE; |
e2ebc74d JB |
261 | } |
262 | ||
9ae54c84 | 263 | return TX_CONTINUE; |
e2ebc74d JB |
264 | } |
265 | ||
e2ebc74d JB |
266 | /* This function is called whenever the AP is about to exceed the maximum limit |
267 | * of buffered frames for power saving STAs. This situation should not really | |
268 | * happen often during normal operation, so dropping the oldest buffered packet | |
269 | * from each queue should be OK to make some room for new frames. */ | |
270 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
271 | { | |
272 | int total = 0, purged = 0; | |
273 | struct sk_buff *skb; | |
274 | struct ieee80211_sub_if_data *sdata; | |
275 | struct sta_info *sta; | |
276 | ||
79010420 JB |
277 | /* |
278 | * virtual interfaces are protected by RCU | |
279 | */ | |
280 | rcu_read_lock(); | |
281 | ||
282 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 283 | struct ieee80211_if_ap *ap; |
3e122be0 | 284 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP) |
e2ebc74d JB |
285 | continue; |
286 | ap = &sdata->u.ap; | |
287 | skb = skb_dequeue(&ap->ps_bc_buf); | |
288 | if (skb) { | |
289 | purged++; | |
290 | dev_kfree_skb(skb); | |
291 | } | |
292 | total += skb_queue_len(&ap->ps_bc_buf); | |
293 | } | |
e2ebc74d | 294 | |
d0709a65 | 295 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
296 | skb = skb_dequeue(&sta->ps_tx_buf); |
297 | if (skb) { | |
298 | purged++; | |
299 | dev_kfree_skb(skb); | |
300 | } | |
301 | total += skb_queue_len(&sta->ps_tx_buf); | |
302 | } | |
d0709a65 JB |
303 | |
304 | rcu_read_unlock(); | |
e2ebc74d JB |
305 | |
306 | local->total_ps_buffered = total; | |
54223995 | 307 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 308 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 309 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 310 | #endif |
e2ebc74d JB |
311 | } |
312 | ||
9ae54c84 | 313 | static ieee80211_tx_result |
5cf121c3 | 314 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 315 | { |
e039fa4a | 316 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 317 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 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 */ | |
358c8d9d | 332 | if (ieee80211_has_order(hdr->frame_control)) |
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); |
358c8d9d | 370 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
07346f81 | 371 | u32 staflags; |
0795af57 | 372 | DECLARE_MAC_BUF(mac); |
e2ebc74d | 373 | |
358c8d9d | 374 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control))) |
9ae54c84 | 375 | return TX_CONTINUE; |
e2ebc74d | 376 | |
07346f81 JB |
377 | staflags = get_sta_flags(sta); |
378 | ||
379 | if (unlikely((staflags & WLAN_STA_PS) && | |
380 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 381 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 | 382 | printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " |
e2ebc74d | 383 | "before %d)\n", |
0795af57 | 384 | print_mac(mac, sta->addr), sta->aid, |
e2ebc74d JB |
385 | skb_queue_len(&sta->ps_tx_buf)); |
386 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
387 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
388 | purge_old_ps_buffers(tx->local); | |
389 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
390 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 391 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 392 | if (net_ratelimit()) { |
0795af57 | 393 | printk(KERN_DEBUG "%s: STA %s TX " |
e2ebc74d | 394 | "buffer full - dropping oldest frame\n", |
0795af57 | 395 | tx->dev->name, print_mac(mac, sta->addr)); |
e2ebc74d | 396 | } |
f4ea83dd | 397 | #endif |
e2ebc74d JB |
398 | dev_kfree_skb(old); |
399 | } else | |
400 | tx->local->total_ps_buffered++; | |
004c872e | 401 | |
e2ebc74d | 402 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
403 | if (skb_queue_empty(&sta->ps_tx_buf)) |
404 | sta_info_set_tim_bit(sta); | |
405 | ||
e039fa4a | 406 | info->control.jiffies = jiffies; |
e2ebc74d | 407 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 408 | return TX_QUEUED; |
e2ebc74d JB |
409 | } |
410 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 411 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0795af57 | 412 | printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " |
e2ebc74d | 413 | "set -> send frame\n", tx->dev->name, |
0795af57 | 414 | print_mac(mac, sta->addr)); |
e2ebc74d JB |
415 | } |
416 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 417 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 418 | |
9ae54c84 | 419 | return TX_CONTINUE; |
e2ebc74d JB |
420 | } |
421 | ||
d9e8a70f | 422 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 423 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 424 | { |
5cf121c3 | 425 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 426 | return TX_CONTINUE; |
e2ebc74d | 427 | |
5cf121c3 | 428 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
429 | return ieee80211_tx_h_unicast_ps_buf(tx); |
430 | else | |
431 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
432 | } | |
433 | ||
d9e8a70f | 434 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 435 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 436 | { |
d4e46a3d | 437 | struct ieee80211_key *key; |
e039fa4a | 438 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 439 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 440 | |
d0f09804 | 441 | if (unlikely(tx->skb->do_not_encrypt)) |
e2ebc74d | 442 | tx->key = NULL; |
d4e46a3d JB |
443 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
444 | tx->key = key; | |
445 | else if ((key = rcu_dereference(tx->sdata->default_key))) | |
446 | tx->key = key; | |
e2ebc74d | 447 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 448 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e039fa4a | 449 | !(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
e2ebc74d | 450 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 451 | return TX_DROP; |
176e4f84 | 452 | } else |
e2ebc74d JB |
453 | tx->key = NULL; |
454 | ||
455 | if (tx->key) { | |
456 | tx->key->tx_rx_count++; | |
011bfcc4 | 457 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
458 | |
459 | switch (tx->key->conf.alg) { | |
460 | case ALG_WEP: | |
358c8d9d | 461 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
462 | break; |
463 | case ALG_TKIP: | |
464 | case ALG_CCMP: | |
358c8d9d | 465 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
466 | tx->key = NULL; |
467 | break; | |
468 | } | |
e2ebc74d JB |
469 | } |
470 | ||
176e4f84 | 471 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
d0f09804 | 472 | tx->skb->do_not_encrypt = 1; |
176e4f84 | 473 | |
9ae54c84 | 474 | return TX_CONTINUE; |
e2ebc74d JB |
475 | } |
476 | ||
d9e8a70f | 477 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 478 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 479 | { |
1abbe498 | 480 | struct rate_selection rsel; |
8318d78a | 481 | struct ieee80211_supported_band *sband; |
e039fa4a | 482 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
8318d78a | 483 | |
2e92e6f2 | 484 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
e2ebc74d | 485 | |
2e92e6f2 | 486 | if (likely(tx->rate_idx < 0)) { |
8318d78a | 487 | rate_control_get_rate(tx->dev, sband, tx->skb, &rsel); |
2e92e6f2 JB |
488 | tx->rate_idx = rsel.rate_idx; |
489 | if (unlikely(rsel.probe_idx >= 0)) { | |
e039fa4a | 490 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
5cf121c3 | 491 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e039fa4a | 492 | info->control.alt_retry_rate_idx = tx->rate_idx; |
2e92e6f2 | 493 | tx->rate_idx = rsel.probe_idx; |
58d4185e | 494 | } else |
e039fa4a | 495 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 496 | |
2e92e6f2 | 497 | if (unlikely(tx->rate_idx < 0)) |
9ae54c84 | 498 | return TX_DROP; |
58d4185e | 499 | } else |
e039fa4a | 500 | info->control.alt_retry_rate_idx = -1; |
58d4185e | 501 | |
8318d78a | 502 | if (tx->sdata->bss_conf.use_cts_prot && |
2e92e6f2 JB |
503 | (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) { |
504 | tx->last_frag_rate_idx = tx->rate_idx; | |
505 | if (rsel.probe_idx >= 0) | |
5cf121c3 | 506 | tx->flags &= ~IEEE80211_TX_PROBE_LAST_FRAG; |
badffb72 | 507 | else |
5cf121c3 | 508 | tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
2e92e6f2 | 509 | tx->rate_idx = rsel.nonerp_idx; |
e039fa4a JB |
510 | info->tx_rate_idx = rsel.nonerp_idx; |
511 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 512 | } else { |
2e92e6f2 | 513 | tx->last_frag_rate_idx = tx->rate_idx; |
e039fa4a | 514 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 515 | } |
e039fa4a | 516 | info->tx_rate_idx = tx->rate_idx; |
e2ebc74d | 517 | |
9ae54c84 | 518 | return TX_CONTINUE; |
e2ebc74d JB |
519 | } |
520 | ||
d9e8a70f | 521 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 522 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) |
e2ebc74d | 523 | { |
065e9605 | 524 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 525 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
2e92e6f2 JB |
526 | struct ieee80211_supported_band *sband; |
527 | ||
528 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; | |
e2ebc74d | 529 | |
e039fa4a JB |
530 | if (tx->sta) |
531 | info->control.aid = tx->sta->aid; | |
532 | ||
533 | if (!info->control.retry_limit) { | |
58d4185e | 534 | if (!is_multicast_ether_addr(hdr->addr1)) { |
e039fa4a JB |
535 | int len = min_t(int, tx->skb->len + FCS_LEN, |
536 | tx->local->fragmentation_threshold); | |
537 | if (len > tx->local->rts_threshold | |
58d4185e | 538 | && tx->local->rts_threshold < |
e039fa4a JB |
539 | IEEE80211_MAX_RTS_THRESHOLD) { |
540 | info->flags |= IEEE80211_TX_CTL_USE_RTS_CTS; | |
541 | info->flags |= | |
542 | IEEE80211_TX_CTL_LONG_RETRY_LIMIT; | |
543 | info->control.retry_limit = | |
58d4185e JB |
544 | tx->local->long_retry_limit; |
545 | } else { | |
e039fa4a | 546 | info->control.retry_limit = |
58d4185e JB |
547 | tx->local->short_retry_limit; |
548 | } | |
e2ebc74d | 549 | } else { |
e039fa4a | 550 | info->control.retry_limit = 1; |
e2ebc74d | 551 | } |
e2ebc74d JB |
552 | } |
553 | ||
5cf121c3 | 554 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
e2ebc74d JB |
555 | /* Do not use multiple retry rates when sending fragmented |
556 | * frames. | |
557 | * TODO: The last fragment could still use multiple retry | |
558 | * rates. */ | |
e039fa4a | 559 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
560 | } |
561 | ||
562 | /* Use CTS protection for unicast frames sent using extended rates if | |
563 | * there are associated non-ERP stations and RTS/CTS is not configured | |
564 | * for the frame. */ | |
8318d78a | 565 | if ((tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) && |
2e92e6f2 | 566 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_ERP_G) && |
5cf121c3 | 567 | (tx->flags & IEEE80211_TX_UNICAST) && |
471b3efd | 568 | tx->sdata->bss_conf.use_cts_prot && |
e039fa4a JB |
569 | !(info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)) |
570 | info->flags |= IEEE80211_TX_CTL_USE_CTS_PROTECT; | |
e2ebc74d | 571 | |
7e9ed188 DD |
572 | /* Transmit data frames using short preambles if the driver supports |
573 | * short preambles at the selected rate and short preambles are | |
574 | * available on the network at the current point in time. */ | |
065e9605 | 575 | if (ieee80211_is_data(hdr->frame_control) && |
2e92e6f2 | 576 | (sband->bitrates[tx->rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) && |
471b3efd | 577 | tx->sdata->bss_conf.use_short_preamble && |
07346f81 | 578 | (!tx->sta || test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))) { |
e039fa4a | 579 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; |
7e9ed188 DD |
580 | } |
581 | ||
e039fa4a JB |
582 | if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) || |
583 | (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) { | |
2e92e6f2 JB |
584 | struct ieee80211_rate *rate; |
585 | s8 baserate = -1; | |
8318d78a JB |
586 | int idx; |
587 | ||
e2ebc74d | 588 | /* Do not use multiple retry rates when using RTS/CTS */ |
e039fa4a | 589 | info->control.alt_retry_rate_idx = -1; |
e2ebc74d JB |
590 | |
591 | /* Use min(data rate, max base rate) as CTS/RTS rate */ | |
2e92e6f2 | 592 | rate = &sband->bitrates[tx->rate_idx]; |
8318d78a JB |
593 | |
594 | for (idx = 0; idx < sband->n_bitrates; idx++) { | |
595 | if (sband->bitrates[idx].bitrate > rate->bitrate) | |
596 | continue; | |
597 | if (tx->sdata->basic_rates & BIT(idx) && | |
2e92e6f2 JB |
598 | (baserate < 0 || |
599 | (sband->bitrates[baserate].bitrate | |
600 | < sband->bitrates[idx].bitrate))) | |
601 | baserate = idx; | |
8318d78a | 602 | } |
e2ebc74d | 603 | |
2e92e6f2 | 604 | if (baserate >= 0) |
e039fa4a | 605 | info->control.rts_cts_rate_idx = baserate; |
8318d78a | 606 | else |
e039fa4a | 607 | info->control.rts_cts_rate_idx = 0; |
e2ebc74d JB |
608 | } |
609 | ||
e2454948 | 610 | if (tx->sta) |
e039fa4a | 611 | info->control.aid = tx->sta->aid; |
e2454948 JB |
612 | |
613 | return TX_CONTINUE; | |
614 | } | |
615 | ||
f591fa5d JB |
616 | static ieee80211_tx_result debug_noinline |
617 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
618 | { | |
619 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
620 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
621 | u16 *seq; | |
622 | u8 *qc; | |
623 | int tid; | |
624 | ||
625 | /* only for injected frames */ | |
626 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) | |
627 | return TX_CONTINUE; | |
628 | ||
629 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
630 | return TX_CONTINUE; | |
631 | ||
632 | if (!ieee80211_is_data_qos(hdr->frame_control)) { | |
633 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
634 | return TX_CONTINUE; | |
635 | } | |
636 | ||
637 | /* | |
638 | * This should be true for injected/management frames only, for | |
639 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
640 | * above since they are not QoS-data frames. | |
641 | */ | |
642 | if (!tx->sta) | |
643 | return TX_CONTINUE; | |
644 | ||
645 | /* include per-STA, per-TID sequence counter */ | |
646 | ||
647 | qc = ieee80211_get_qos_ctl(hdr); | |
648 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
649 | seq = &tx->sta->tid_seq[tid]; | |
650 | ||
651 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
652 | ||
653 | /* Increase the sequence number. */ | |
654 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
655 | ||
656 | return TX_CONTINUE; | |
657 | } | |
658 | ||
d9e8a70f | 659 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
660 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
661 | { | |
065e9605 | 662 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2454948 JB |
663 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; |
664 | struct sk_buff **frags, *first, *frag; | |
665 | int i; | |
666 | u16 seq; | |
667 | u8 *pos; | |
668 | int frag_threshold = tx->local->fragmentation_threshold; | |
669 | ||
670 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
671 | return TX_CONTINUE; | |
672 | ||
eefce91a JB |
673 | /* |
674 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
675 | * This scenario is handled in __ieee80211_tx_prepare but extra |
676 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a JB |
677 | */ |
678 | if (WARN_ON(tx->flags & IEEE80211_TX_CTL_AMPDU || | |
e2530083 JB |
679 | skb_get_queue_mapping(tx->skb) >= |
680 | ieee80211_num_regular_queues(&tx->local->hw))) | |
eefce91a JB |
681 | return TX_DROP; |
682 | ||
e2454948 JB |
683 | first = tx->skb; |
684 | ||
065e9605 | 685 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 JB |
686 | payload_len = first->len - hdrlen; |
687 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
688 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
689 | ||
690 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
691 | if (!frags) | |
692 | goto fail; | |
693 | ||
694 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
695 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
696 | pos = first->data + hdrlen + per_fragm; | |
697 | left = payload_len - per_fragm; | |
698 | for (i = 0; i < num_fragm - 1; i++) { | |
699 | struct ieee80211_hdr *fhdr; | |
700 | size_t copylen; | |
701 | ||
702 | if (left <= 0) | |
703 | goto fail; | |
704 | ||
705 | /* reserve enough extra head and tail room for possible | |
706 | * encryption */ | |
707 | frag = frags[i] = | |
708 | dev_alloc_skb(tx->local->tx_headroom + | |
709 | frag_threshold + | |
710 | IEEE80211_ENCRYPT_HEADROOM + | |
711 | IEEE80211_ENCRYPT_TAILROOM); | |
712 | if (!frag) | |
713 | goto fail; | |
714 | /* Make sure that all fragments use the same priority so | |
715 | * that they end up using the same TX queue */ | |
716 | frag->priority = first->priority; | |
717 | skb_reserve(frag, tx->local->tx_headroom + | |
718 | IEEE80211_ENCRYPT_HEADROOM); | |
719 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); | |
720 | memcpy(fhdr, first->data, hdrlen); | |
721 | if (i == num_fragm - 2) | |
722 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
723 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); | |
724 | copylen = left > per_fragm ? per_fragm : left; | |
725 | memcpy(skb_put(frag, copylen), pos, copylen); | |
03f93c3d JB |
726 | memcpy(frag->cb, first->cb, sizeof(frag->cb)); |
727 | skb_copy_queue_mapping(frag, first); | |
d0f09804 | 728 | frag->do_not_encrypt = first->do_not_encrypt; |
e2454948 JB |
729 | |
730 | pos += copylen; | |
731 | left -= copylen; | |
e2ebc74d | 732 | } |
e2454948 JB |
733 | skb_trim(first, hdrlen + per_fragm); |
734 | ||
735 | tx->num_extra_frag = num_fragm - 1; | |
736 | tx->extra_frag = frags; | |
e2ebc74d | 737 | |
9ae54c84 | 738 | return TX_CONTINUE; |
e2454948 JB |
739 | |
740 | fail: | |
e2454948 JB |
741 | if (frags) { |
742 | for (i = 0; i < num_fragm - 1; i++) | |
743 | if (frags[i]) | |
744 | dev_kfree_skb(frags[i]); | |
745 | kfree(frags); | |
746 | } | |
747 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
748 | return TX_DROP; | |
e2ebc74d JB |
749 | } |
750 | ||
d9e8a70f | 751 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
752 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
753 | { | |
754 | if (!tx->key) | |
755 | return TX_CONTINUE; | |
756 | ||
757 | switch (tx->key->conf.alg) { | |
758 | case ALG_WEP: | |
759 | return ieee80211_crypto_wep_encrypt(tx); | |
760 | case ALG_TKIP: | |
761 | return ieee80211_crypto_tkip_encrypt(tx); | |
762 | case ALG_CCMP: | |
763 | return ieee80211_crypto_ccmp_encrypt(tx); | |
764 | } | |
765 | ||
766 | /* not reached */ | |
767 | WARN_ON(1); | |
768 | return TX_DROP; | |
769 | } | |
770 | ||
d9e8a70f | 771 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
772 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
773 | { | |
774 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
775 | int next_len, i; | |
776 | int group_addr = is_multicast_ether_addr(hdr->addr1); | |
777 | ||
778 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) { | |
779 | hdr->duration_id = ieee80211_duration(tx, group_addr, 0); | |
780 | return TX_CONTINUE; | |
781 | } | |
782 | ||
783 | hdr->duration_id = ieee80211_duration(tx, group_addr, | |
784 | tx->extra_frag[0]->len); | |
785 | ||
786 | for (i = 0; i < tx->num_extra_frag; i++) { | |
787 | if (i + 1 < tx->num_extra_frag) { | |
788 | next_len = tx->extra_frag[i + 1]->len; | |
789 | } else { | |
790 | next_len = 0; | |
791 | tx->rate_idx = tx->last_frag_rate_idx; | |
792 | } | |
793 | ||
794 | hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data; | |
795 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); | |
796 | } | |
797 | ||
798 | return TX_CONTINUE; | |
799 | } | |
800 | ||
d9e8a70f | 801 | static ieee80211_tx_result debug_noinline |
e2454948 | 802 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 803 | { |
9e72ebd6 | 804 | int i; |
e2ebc74d | 805 | |
9e72ebd6 JB |
806 | if (!tx->sta) |
807 | return TX_CONTINUE; | |
e2ebc74d | 808 | |
9e72ebd6 JB |
809 | tx->sta->tx_packets++; |
810 | tx->sta->tx_fragments++; | |
811 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 812 | if (tx->extra_frag) { |
9e72ebd6 JB |
813 | tx->sta->tx_fragments += tx->num_extra_frag; |
814 | for (i = 0; i < tx->num_extra_frag; i++) | |
815 | tx->sta->tx_bytes += tx->extra_frag[i]->len; | |
e2454948 JB |
816 | } |
817 | ||
9ae54c84 | 818 | return TX_CONTINUE; |
e2ebc74d JB |
819 | } |
820 | ||
e2ebc74d | 821 | |
e2ebc74d JB |
822 | /* actual transmit path */ |
823 | ||
824 | /* | |
825 | * deal with packet injection down monitor interface | |
826 | * with Radiotap Header -- only called for monitor mode interface | |
827 | */ | |
9ae54c84 | 828 | static ieee80211_tx_result |
5cf121c3 | 829 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 830 | struct sk_buff *skb) |
e2ebc74d JB |
831 | { |
832 | /* | |
833 | * this is the moment to interpret and discard the radiotap header that | |
834 | * must be at the start of the packet injected in Monitor mode | |
835 | * | |
836 | * Need to take some care with endian-ness since radiotap | |
837 | * args are little-endian | |
838 | */ | |
839 | ||
840 | struct ieee80211_radiotap_iterator iterator; | |
841 | struct ieee80211_radiotap_header *rthdr = | |
842 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 843 | struct ieee80211_supported_band *sband; |
e2ebc74d | 844 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
e039fa4a | 845 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 846 | |
2e92e6f2 | 847 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 848 | |
d0f09804 | 849 | skb->do_not_encrypt = 1; |
e039fa4a | 850 | info->flags |= IEEE80211_TX_CTL_INJECTED; |
5cf121c3 | 851 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
852 | |
853 | /* | |
854 | * for every radiotap entry that is present | |
855 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
856 | * entries present, or -EINVAL on error) | |
857 | */ | |
858 | ||
859 | while (!ret) { | |
860 | int i, target_rate; | |
861 | ||
862 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
863 | ||
864 | if (ret) | |
865 | continue; | |
866 | ||
867 | /* see if this argument is something we can use */ | |
868 | switch (iterator.this_arg_index) { | |
869 | /* | |
870 | * You must take care when dereferencing iterator.this_arg | |
871 | * for multibyte types... the pointer is not aligned. Use | |
872 | * get_unaligned((type *)iterator.this_arg) to dereference | |
873 | * iterator.this_arg for type "type" safely on all arches. | |
874 | */ | |
875 | case IEEE80211_RADIOTAP_RATE: | |
876 | /* | |
877 | * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps | |
878 | * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps | |
879 | */ | |
880 | target_rate = (*iterator.this_arg) * 5; | |
8318d78a JB |
881 | for (i = 0; i < sband->n_bitrates; i++) { |
882 | struct ieee80211_rate *r; | |
e2ebc74d | 883 | |
8318d78a JB |
884 | r = &sband->bitrates[i]; |
885 | ||
886 | if (r->bitrate == target_rate) { | |
2e92e6f2 | 887 | tx->rate_idx = i; |
58d4185e JB |
888 | break; |
889 | } | |
e2ebc74d JB |
890 | } |
891 | break; | |
892 | ||
893 | case IEEE80211_RADIOTAP_ANTENNA: | |
894 | /* | |
895 | * radiotap uses 0 for 1st ant, mac80211 is 1 for | |
896 | * 1st ant | |
897 | */ | |
e039fa4a | 898 | info->antenna_sel_tx = (*iterator.this_arg) + 1; |
e2ebc74d JB |
899 | break; |
900 | ||
8318d78a | 901 | #if 0 |
e2ebc74d JB |
902 | case IEEE80211_RADIOTAP_DBM_TX_POWER: |
903 | control->power_level = *iterator.this_arg; | |
904 | break; | |
8318d78a | 905 | #endif |
e2ebc74d JB |
906 | |
907 | case IEEE80211_RADIOTAP_FLAGS: | |
908 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
909 | /* | |
910 | * this indicates that the skb we have been | |
911 | * handed has the 32-bit FCS CRC at the end... | |
912 | * we should react to that by snipping it off | |
913 | * because it will be recomputed and added | |
914 | * on transmission | |
915 | */ | |
916 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 917 | return TX_DROP; |
e2ebc74d JB |
918 | |
919 | skb_trim(skb, skb->len - FCS_LEN); | |
920 | } | |
58d4185e | 921 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 922 | tx->skb->do_not_encrypt = 0; |
58d4185e | 923 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 924 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
925 | break; |
926 | ||
58d4185e JB |
927 | /* |
928 | * Please update the file | |
929 | * Documentation/networking/mac80211-injection.txt | |
930 | * when parsing new fields here. | |
931 | */ | |
932 | ||
e2ebc74d JB |
933 | default: |
934 | break; | |
935 | } | |
936 | } | |
937 | ||
938 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 939 | return TX_DROP; |
e2ebc74d JB |
940 | |
941 | /* | |
942 | * remove the radiotap header | |
943 | * iterator->max_length was sanity-checked against | |
944 | * skb->len by iterator init | |
945 | */ | |
946 | skb_pull(skb, iterator.max_length); | |
947 | ||
9ae54c84 | 948 | return TX_CONTINUE; |
e2ebc74d JB |
949 | } |
950 | ||
58d4185e JB |
951 | /* |
952 | * initialises @tx | |
953 | */ | |
9ae54c84 | 954 | static ieee80211_tx_result |
5cf121c3 | 955 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 956 | struct sk_buff *skb, |
e039fa4a | 957 | struct net_device *dev) |
e2ebc74d JB |
958 | { |
959 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 960 | struct ieee80211_hdr *hdr; |
e2ebc74d | 961 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 962 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d JB |
963 | |
964 | int hdrlen; | |
965 | ||
966 | memset(tx, 0, sizeof(*tx)); | |
967 | tx->skb = skb; | |
968 | tx->dev = dev; /* use original interface */ | |
969 | tx->local = local; | |
970 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 971 | tx->channel = local->hw.conf.channel; |
5854a32e JB |
972 | tx->rate_idx = -1; |
973 | tx->last_frag_rate_idx = -1; | |
e2ebc74d | 974 | /* |
58d4185e JB |
975 | * Set this flag (used below to indicate "automatic fragmentation"), |
976 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 977 | */ |
5cf121c3 | 978 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
979 | |
980 | /* process and remove the injection radiotap header */ | |
981 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
51fb61e7 | 982 | if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { |
9ae54c84 JB |
983 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
984 | return TX_DROP; | |
58d4185e | 985 | |
e2ebc74d | 986 | /* |
58d4185e JB |
987 | * __ieee80211_parse_tx_radiotap has now removed |
988 | * the radiotap header that was present and pre-filled | |
989 | * 'tx' with tx control information. | |
e2ebc74d | 990 | */ |
e2ebc74d JB |
991 | } |
992 | ||
58d4185e JB |
993 | hdr = (struct ieee80211_hdr *) skb->data; |
994 | ||
24338793 | 995 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 996 | |
badffb72 | 997 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 998 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 999 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1000 | } else { |
5cf121c3 | 1001 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 1002 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1003 | } |
58d4185e | 1004 | |
5cf121c3 JB |
1005 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1006 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 1007 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 RR |
1008 | !local->ops->set_frag_threshold && |
1009 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) | |
5cf121c3 | 1010 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1011 | else |
5cf121c3 | 1012 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1013 | } |
1014 | ||
e2ebc74d | 1015 | if (!tx->sta) |
e039fa4a | 1016 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1017 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1018 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1019 | |
b73d70ad | 1020 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1021 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1022 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1023 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1024 | } | |
e039fa4a | 1025 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1026 | |
9ae54c84 | 1027 | return TX_CONTINUE; |
e2ebc74d JB |
1028 | } |
1029 | ||
32bfd35d | 1030 | /* |
58d4185e JB |
1031 | * NB: @tx is uninitialised when passed in here |
1032 | */ | |
5cf121c3 | 1033 | static int ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
58d4185e | 1034 | struct sk_buff *skb, |
e039fa4a | 1035 | struct net_device *mdev) |
e2ebc74d | 1036 | { |
e2ebc74d JB |
1037 | struct net_device *dev; |
1038 | ||
d0f09804 | 1039 | dev = dev_get_by_index(&init_net, skb->iif); |
e2ebc74d JB |
1040 | if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { |
1041 | dev_put(dev); | |
1042 | dev = NULL; | |
1043 | } | |
1044 | if (unlikely(!dev)) | |
1045 | return -ENODEV; | |
58d4185e | 1046 | /* initialises tx with control */ |
e039fa4a | 1047 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1048 | dev_put(dev); |
e2ebc74d JB |
1049 | return 0; |
1050 | } | |
1051 | ||
1052 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1053 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1054 | { |
f8e79ddd | 1055 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1056 | int ret, i; |
1057 | ||
e2ebc74d | 1058 | if (skb) { |
f8e79ddd TW |
1059 | if (netif_subqueue_stopped(local->mdev, skb)) |
1060 | return IEEE80211_TX_AGAIN; | |
1061 | info = IEEE80211_SKB_CB(skb); | |
1062 | ||
dd1cd4c6 JB |
1063 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
1064 | "TX to low-level driver", skb); | |
e039fa4a | 1065 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1066 | if (ret) |
1067 | return IEEE80211_TX_AGAIN; | |
1068 | local->mdev->trans_start = jiffies; | |
1069 | ieee80211_led_tx(local, 1); | |
1070 | } | |
5cf121c3 | 1071 | if (tx->extra_frag) { |
5cf121c3 JB |
1072 | for (i = 0; i < tx->num_extra_frag; i++) { |
1073 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1074 | continue; |
e039fa4a JB |
1075 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
1076 | info->flags &= ~(IEEE80211_TX_CTL_USE_RTS_CTS | | |
1077 | IEEE80211_TX_CTL_USE_CTS_PROTECT | | |
1078 | IEEE80211_TX_CTL_CLEAR_PS_FILT | | |
1079 | IEEE80211_TX_CTL_FIRST_FRAGMENT); | |
e2530083 JB |
1080 | if (netif_subqueue_stopped(local->mdev, |
1081 | tx->extra_frag[i])) | |
e2ebc74d | 1082 | return IEEE80211_TX_FRAG_AGAIN; |
5cf121c3 | 1083 | if (i == tx->num_extra_frag) { |
e039fa4a | 1084 | info->tx_rate_idx = tx->last_frag_rate_idx; |
8318d78a | 1085 | |
5cf121c3 | 1086 | if (tx->flags & IEEE80211_TX_PROBE_LAST_FRAG) |
e039fa4a JB |
1087 | info->flags |= |
1088 | IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d | 1089 | else |
e039fa4a JB |
1090 | info->flags &= |
1091 | ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
e2ebc74d JB |
1092 | } |
1093 | ||
dd1cd4c6 | 1094 | ieee80211_dump_frame(wiphy_name(local->hw.wiphy), |
e2ebc74d | 1095 | "TX to low-level driver", |
5cf121c3 | 1096 | tx->extra_frag[i]); |
e2ebc74d | 1097 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1098 | tx->extra_frag[i]); |
e2ebc74d JB |
1099 | if (ret) |
1100 | return IEEE80211_TX_FRAG_AGAIN; | |
1101 | local->mdev->trans_start = jiffies; | |
1102 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1103 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1104 | } |
5cf121c3 JB |
1105 | kfree(tx->extra_frag); |
1106 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1107 | } |
1108 | return IEEE80211_TX_OK; | |
1109 | } | |
1110 | ||
97b045d6 JB |
1111 | /* |
1112 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1113 | * frame was dropped or queued. | |
1114 | */ | |
1115 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1116 | { | |
97b045d6 | 1117 | struct sk_buff *skb = tx->skb; |
97b045d6 JB |
1118 | ieee80211_tx_result res = TX_DROP; |
1119 | int i; | |
1120 | ||
d9e8a70f JB |
1121 | #define CALL_TXH(txh) \ |
1122 | res = txh(tx); \ | |
1123 | if (res != TX_CONTINUE) \ | |
1124 | goto txh_done; | |
1125 | ||
1126 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1127 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1128 | CALL_TXH(ieee80211_tx_h_select_key) | |
1129 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1130 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1131 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1132 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1133 | CALL_TXH(ieee80211_tx_h_fragment) |
1134 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1135 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1136 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1137 | CALL_TXH(ieee80211_tx_h_stats) | |
1138 | #undef CALL_TXH | |
97b045d6 | 1139 | |
d9e8a70f | 1140 | txh_done: |
97b045d6 | 1141 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1142 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
97b045d6 JB |
1143 | dev_kfree_skb(skb); |
1144 | for (i = 0; i < tx->num_extra_frag; i++) | |
1145 | if (tx->extra_frag[i]) | |
1146 | dev_kfree_skb(tx->extra_frag[i]); | |
1147 | kfree(tx->extra_frag); | |
1148 | return -1; | |
1149 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1150 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1151 | return -1; |
1152 | } | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
e039fa4a | 1157 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1158 | { |
1159 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1160 | struct sta_info *sta; | |
5cf121c3 | 1161 | struct ieee80211_tx_data tx; |
97b045d6 | 1162 | ieee80211_tx_result res_prepare; |
e039fa4a | 1163 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1164 | int ret, i; |
e2530083 | 1165 | u16 queue; |
e2ebc74d | 1166 | |
e2530083 JB |
1167 | queue = skb_get_queue_mapping(skb); |
1168 | ||
1169 | WARN_ON(test_bit(queue, local->queues_pending)); | |
e2ebc74d JB |
1170 | |
1171 | if (unlikely(skb->len < 10)) { | |
1172 | dev_kfree_skb(skb); | |
1173 | return 0; | |
1174 | } | |
1175 | ||
d0709a65 JB |
1176 | rcu_read_lock(); |
1177 | ||
58d4185e | 1178 | /* initialises tx */ |
e039fa4a | 1179 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1180 | |
9ae54c84 | 1181 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1182 | dev_kfree_skb(skb); |
d0709a65 | 1183 | rcu_read_unlock(); |
e2ebc74d JB |
1184 | return 0; |
1185 | } | |
1186 | ||
1187 | sta = tx.sta; | |
5cf121c3 | 1188 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1189 | info->band = tx.channel->band; |
e2ebc74d | 1190 | |
97b045d6 JB |
1191 | if (invoke_tx_handlers(&tx)) |
1192 | goto out; | |
e2ebc74d | 1193 | |
e2ebc74d JB |
1194 | retry: |
1195 | ret = __ieee80211_tx(local, skb, &tx); | |
1196 | if (ret) { | |
eefce91a JB |
1197 | struct ieee80211_tx_stored_packet *store; |
1198 | ||
1199 | /* | |
1200 | * Since there are no fragmented frames on A-MPDU | |
1201 | * queues, there's no reason for a driver to reject | |
1202 | * a frame there, warn and drop it. | |
1203 | */ | |
e2530083 | 1204 | if (WARN_ON(queue >= ieee80211_num_regular_queues(&local->hw))) |
eefce91a JB |
1205 | goto drop; |
1206 | ||
1207 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1208 | |
1209 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1210 | skb = NULL; | |
f8e79ddd | 1211 | |
e2530083 | 1212 | set_bit(queue, local->queues_pending); |
e2ebc74d | 1213 | smp_mb(); |
e2530083 JB |
1214 | /* |
1215 | * When the driver gets out of buffers during sending of | |
1216 | * fragments and calls ieee80211_stop_queue, the netif | |
1217 | * subqueue is stopped. There is, however, a small window | |
1218 | * in which the PENDING bit is not yet set. If a buffer | |
e2ebc74d JB |
1219 | * gets available in that window (i.e. driver calls |
1220 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
e2530083 | 1221 | * called with the PENDING bit still set. Prevent this by |
e2ebc74d | 1222 | * continuing transmitting here when that situation is |
e2530083 JB |
1223 | * possible to have happened. |
1224 | */ | |
1225 | if (!__netif_subqueue_stopped(local->mdev, queue)) { | |
1226 | clear_bit(queue, local->queues_pending); | |
e2ebc74d JB |
1227 | goto retry; |
1228 | } | |
e2ebc74d | 1229 | store->skb = skb; |
5cf121c3 JB |
1230 | store->extra_frag = tx.extra_frag; |
1231 | store->num_extra_frag = tx.num_extra_frag; | |
2e92e6f2 | 1232 | store->last_frag_rate_idx = tx.last_frag_rate_idx; |
badffb72 | 1233 | store->last_frag_rate_ctrl_probe = |
5cf121c3 | 1234 | !!(tx.flags & IEEE80211_TX_PROBE_LAST_FRAG); |
e2ebc74d | 1235 | } |
97b045d6 | 1236 | out: |
d4e46a3d | 1237 | rcu_read_unlock(); |
e2ebc74d JB |
1238 | return 0; |
1239 | ||
1240 | drop: | |
1241 | if (skb) | |
1242 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1243 | for (i = 0; i < tx.num_extra_frag; i++) |
1244 | if (tx.extra_frag[i]) | |
1245 | dev_kfree_skb(tx.extra_frag[i]); | |
1246 | kfree(tx.extra_frag); | |
d4e46a3d | 1247 | rcu_read_unlock(); |
e2ebc74d JB |
1248 | return 0; |
1249 | } | |
1250 | ||
1251 | /* device xmit handlers */ | |
1252 | ||
23c0752a JB |
1253 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1254 | struct sk_buff *skb, | |
1255 | int head_need, bool may_encrypt) | |
1256 | { | |
1257 | int tail_need = 0; | |
1258 | ||
1259 | /* | |
1260 | * This could be optimised, devices that do full hardware | |
1261 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1262 | * have no drivers for such devices currently. | |
1263 | */ | |
1264 | if (may_encrypt) { | |
1265 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1266 | tail_need -= skb_tailroom(skb); | |
1267 | tail_need = max_t(int, tail_need, 0); | |
1268 | } | |
1269 | ||
1270 | if (head_need || tail_need) { | |
1271 | /* Sorry. Can't account for this any more */ | |
1272 | skb_orphan(skb); | |
1273 | } | |
1274 | ||
1275 | if (skb_header_cloned(skb)) | |
1276 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1277 | else | |
1278 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1279 | ||
1280 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1281 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1282 | wiphy_name(local->hw.wiphy)); | |
1283 | return -ENOMEM; | |
1284 | } | |
1285 | ||
1286 | /* update truesize too */ | |
1287 | skb->truesize += head_need + tail_need; | |
1288 | ||
1289 | return 0; | |
1290 | } | |
1291 | ||
e2ebc74d JB |
1292 | int ieee80211_master_start_xmit(struct sk_buff *skb, |
1293 | struct net_device *dev) | |
1294 | { | |
e039fa4a | 1295 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1296 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1297 | struct net_device *odev = NULL; |
1298 | struct ieee80211_sub_if_data *osdata; | |
1299 | int headroom; | |
23c0752a | 1300 | bool may_encrypt; |
e2ebc74d JB |
1301 | int ret; |
1302 | ||
d0f09804 JB |
1303 | if (skb->iif) |
1304 | odev = dev_get_by_index(&init_net, skb->iif); | |
e2ebc74d JB |
1305 | if (unlikely(odev && !is_ieee80211_device(odev, dev))) { |
1306 | dev_put(odev); | |
1307 | odev = NULL; | |
1308 | } | |
1309 | if (unlikely(!odev)) { | |
1310 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1311 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1312 | "originating device\n", dev->name); | |
1313 | #endif | |
1314 | dev_kfree_skb(skb); | |
1315 | return 0; | |
1316 | } | |
e039fa4a | 1317 | |
d0f09804 JB |
1318 | memset(info, 0, sizeof(*info)); |
1319 | ||
1320 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1321 | ||
e2ebc74d JB |
1322 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1323 | ||
e32f85f7 LCC |
1324 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1325 | ieee80211_is_data(hdr->frame_control)) { | |
1326 | if (ieee80211_is_data(hdr->frame_control)) { | |
1327 | if (is_multicast_ether_addr(hdr->addr3)) | |
1328 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1329 | else | |
f698d856 | 1330 | if (mesh_nexthop_lookup(skb, osdata)) |
e32f85f7 LCC |
1331 | return 0; |
1332 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) | |
1333 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.sta, | |
1334 | fwded_frames); | |
1335 | } | |
1336 | } | |
1337 | ||
d0f09804 | 1338 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1339 | |
1340 | headroom = osdata->local->tx_headroom; | |
1341 | if (may_encrypt) | |
1342 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1343 | headroom -= skb_headroom(skb); | |
1344 | headroom = max_t(int, 0, headroom); | |
1345 | ||
1346 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1347 | dev_kfree_skb(skb); | |
1348 | dev_put(odev); | |
1349 | return 0; | |
e2ebc74d JB |
1350 | } |
1351 | ||
e039fa4a JB |
1352 | info->control.vif = &osdata->vif; |
1353 | ret = ieee80211_tx(odev, skb); | |
e2ebc74d JB |
1354 | dev_put(odev); |
1355 | ||
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1360 | struct net_device *dev) | |
1361 | { | |
1362 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1363 | struct ieee80211_radiotap_header *prthdr = |
1364 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1365 | u16 len_rthdr; |
e2ebc74d | 1366 | |
9b8a74e3 AG |
1367 | /* check for not even having the fixed radiotap header part */ |
1368 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1369 | goto fail; /* too short to be possibly valid */ | |
1370 | ||
1371 | /* is it a header version we can trust to find length from? */ | |
1372 | if (unlikely(prthdr->it_version)) | |
1373 | goto fail; /* only version 0 is supported */ | |
1374 | ||
1375 | /* then there must be a radiotap header with a length we can use */ | |
1376 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1377 | ||
1378 | /* does the skb contain enough to deliver on the alleged length? */ | |
1379 | if (unlikely(skb->len < len_rthdr)) | |
1380 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1381 | |
1382 | skb->dev = local->mdev; | |
1383 | ||
9b8a74e3 | 1384 | /* needed because we set skb device to master */ |
d0f09804 | 1385 | skb->iif = dev->ifindex; |
9b8a74e3 | 1386 | |
d0f09804 JB |
1387 | /* sometimes we do encrypt injected frames, will be fixed |
1388 | * up in radiotap parser if not wanted */ | |
1389 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1390 | |
e2ebc74d JB |
1391 | /* |
1392 | * fix up the pointers accounting for the radiotap | |
1393 | * header still being in there. We are being given | |
1394 | * a precooked IEEE80211 header so no need for | |
1395 | * normal processing | |
1396 | */ | |
9b8a74e3 | 1397 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1398 | /* |
9b8a74e3 AG |
1399 | * these are just fixed to the end of the rt area since we |
1400 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1401 | */ |
9b8a74e3 AG |
1402 | skb_set_network_header(skb, len_rthdr); |
1403 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1404 | |
9b8a74e3 AG |
1405 | /* pass the radiotap header up to the next stage intact */ |
1406 | dev_queue_xmit(skb); | |
e2ebc74d | 1407 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1408 | |
1409 | fail: | |
1410 | dev_kfree_skb(skb); | |
1411 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1412 | } |
1413 | ||
1414 | /** | |
1415 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1416 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1417 | * @skb: packet to be sent | |
1418 | * @dev: incoming interface | |
1419 | * | |
1420 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1421 | * not be freed, and caller is responsible for either retrying later or freeing | |
1422 | * skb). | |
1423 | * | |
1424 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1425 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1426 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1427 | * transmission (through low-level driver). | |
1428 | */ | |
1429 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1430 | struct net_device *dev) | |
1431 | { | |
1432 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
e2ebc74d JB |
1433 | struct ieee80211_sub_if_data *sdata; |
1434 | int ret = 1, head_need; | |
065e9605 HH |
1435 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1436 | __le16 fc; | |
e2ebc74d | 1437 | struct ieee80211_hdr hdr; |
33b64eb2 | 1438 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1439 | const u8 *encaps_data; |
1440 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1441 | int nh_pos, h_pos; |
e2ebc74d | 1442 | struct sta_info *sta; |
ce3edf6d | 1443 | u32 sta_flags = 0; |
e2ebc74d JB |
1444 | |
1445 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1446 | if (unlikely(skb->len < ETH_HLEN)) { | |
e2ebc74d JB |
1447 | ret = 0; |
1448 | goto fail; | |
1449 | } | |
1450 | ||
1451 | nh_pos = skb_network_header(skb) - skb->data; | |
1452 | h_pos = skb_transport_header(skb) - skb->data; | |
1453 | ||
1454 | /* convert Ethernet header to proper 802.11 header (based on | |
1455 | * operation mode) */ | |
1456 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1457 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1458 | |
51fb61e7 | 1459 | switch (sdata->vif.type) { |
cf966838 JB |
1460 | case IEEE80211_IF_TYPE_AP: |
1461 | case IEEE80211_IF_TYPE_VLAN: | |
065e9605 | 1462 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1463 | /* DA BSSID SA */ |
1464 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1465 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1466 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1467 | hdrlen = 24; | |
cf966838 JB |
1468 | break; |
1469 | case IEEE80211_IF_TYPE_WDS: | |
065e9605 | 1470 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1471 | /* RA TA DA SA */ |
1472 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1473 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1474 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1475 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1476 | hdrlen = 30; | |
cf966838 | 1477 | break; |
33b64eb2 LCC |
1478 | #ifdef CONFIG_MAC80211_MESH |
1479 | case IEEE80211_IF_TYPE_MESH_POINT: | |
065e9605 | 1480 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
33b64eb2 | 1481 | /* RA TA DA SA */ |
e32f85f7 | 1482 | memset(hdr.addr1, 0, ETH_ALEN); |
33b64eb2 LCC |
1483 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); |
1484 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1485 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
e32f85f7 LCC |
1486 | if (!sdata->u.sta.mshcfg.dot11MeshTTL) { |
1487 | /* Do not send frames with mesh_ttl == 0 */ | |
1488 | sdata->u.sta.mshstats.dropped_frames_ttl++; | |
1489 | ret = 0; | |
1490 | goto fail; | |
33b64eb2 | 1491 | } |
e32f85f7 | 1492 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); |
33b64eb2 LCC |
1493 | hdrlen = 30; |
1494 | break; | |
1495 | #endif | |
cf966838 | 1496 | case IEEE80211_IF_TYPE_STA: |
065e9605 | 1497 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1498 | /* BSSID SA DA */ |
1499 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1500 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1501 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1502 | hdrlen = 24; | |
cf966838 JB |
1503 | break; |
1504 | case IEEE80211_IF_TYPE_IBSS: | |
e2ebc74d JB |
1505 | /* DA SA BSSID */ |
1506 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1507 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1508 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1509 | hdrlen = 24; | |
cf966838 JB |
1510 | break; |
1511 | default: | |
e2ebc74d JB |
1512 | ret = 0; |
1513 | goto fail; | |
1514 | } | |
1515 | ||
7d185b8b JB |
1516 | /* |
1517 | * There's no need to try to look up the destination | |
1518 | * if it is a multicast address (which can only happen | |
1519 | * in AP mode) | |
1520 | */ | |
1521 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1522 | rcu_read_lock(); |
7d185b8b | 1523 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1524 | if (sta) |
07346f81 | 1525 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1526 | rcu_read_unlock(); |
e2ebc74d JB |
1527 | } |
1528 | ||
3434fbd3 | 1529 | /* receiver and we are QoS enabled, use a QoS type frame */ |
e2530083 JB |
1530 | if (sta_flags & WLAN_STA_WME && |
1531 | ieee80211_num_regular_queues(&local->hw) >= 4) { | |
065e9605 | 1532 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1533 | hdrlen += 2; |
1534 | } | |
1535 | ||
1536 | /* | |
238814fd JB |
1537 | * Drop unicast frames to unauthorised stations unless they are |
1538 | * EAPOL frames from the local station. | |
ce3edf6d | 1539 | */ |
e32f85f7 LCC |
1540 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1541 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1542 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1543 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1544 | compare_ether_addr(dev->dev_addr, |
1545 | skb->data + ETH_ALEN) == 0))) { | |
1546 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1547 | DECLARE_MAC_BUF(mac); | |
1548 | ||
1549 | if (net_ratelimit()) | |
1550 | printk(KERN_DEBUG "%s: dropped frame to %s" | |
1551 | " (unauthorized port)\n", dev->name, | |
1552 | print_mac(mac, hdr.addr1)); | |
1553 | #endif | |
1554 | ||
1555 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1556 | ||
1557 | ret = 0; | |
1558 | goto fail; | |
1559 | } | |
1560 | ||
065e9605 | 1561 | hdr.frame_control = fc; |
e2ebc74d JB |
1562 | hdr.duration_id = 0; |
1563 | hdr.seq_ctrl = 0; | |
1564 | ||
1565 | skip_header_bytes = ETH_HLEN; | |
1566 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1567 | encaps_data = bridge_tunnel_header; | |
1568 | encaps_len = sizeof(bridge_tunnel_header); | |
1569 | skip_header_bytes -= 2; | |
1570 | } else if (ethertype >= 0x600) { | |
1571 | encaps_data = rfc1042_header; | |
1572 | encaps_len = sizeof(rfc1042_header); | |
1573 | skip_header_bytes -= 2; | |
1574 | } else { | |
1575 | encaps_data = NULL; | |
1576 | encaps_len = 0; | |
1577 | } | |
1578 | ||
1579 | skb_pull(skb, skip_header_bytes); | |
1580 | nh_pos -= skip_header_bytes; | |
1581 | h_pos -= skip_header_bytes; | |
1582 | ||
1583 | /* TODO: implement support for fragments so that there is no need to | |
1584 | * reallocate and copy payload; it might be enough to support one | |
1585 | * extra fragment that would be copied in the beginning of the frame | |
1586 | * data.. anyway, it would be nice to include this into skb structure | |
1587 | * somehow | |
1588 | * | |
1589 | * There are few options for this: | |
1590 | * use skb->cb as an extra space for 802.11 header | |
1591 | * allocate new buffer if not enough headroom | |
1592 | * make sure that there is enough headroom in every skb by increasing | |
1593 | * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and | |
1594 | * alloc_skb() (net/core/skbuff.c) | |
1595 | */ | |
23c0752a | 1596 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1597 | |
23c0752a JB |
1598 | /* |
1599 | * So we need to modify the skb header and hence need a copy of | |
1600 | * that. The head_need variable above doesn't, so far, include | |
1601 | * the needed header space that we don't need right away. If we | |
1602 | * can, then we don't reallocate right now but only after the | |
1603 | * frame arrives at the master device (if it does...) | |
1604 | * | |
1605 | * If we cannot, however, then we will reallocate to include all | |
1606 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1607 | * make it big enough for everything we may ever need. | |
1608 | */ | |
e2ebc74d | 1609 | |
3a5be7d4 | 1610 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1611 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1612 | head_need += local->tx_headroom; | |
1613 | head_need = max_t(int, 0, head_need); | |
1614 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1615 | goto fail; |
e2ebc74d JB |
1616 | } |
1617 | ||
1618 | if (encaps_data) { | |
1619 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1620 | nh_pos += encaps_len; | |
1621 | h_pos += encaps_len; | |
1622 | } | |
c29b9b9b | 1623 | |
33b64eb2 LCC |
1624 | if (meshhdrlen > 0) { |
1625 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1626 | nh_pos += meshhdrlen; | |
1627 | h_pos += meshhdrlen; | |
1628 | } | |
1629 | ||
065e9605 | 1630 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1631 | __le16 *qos_control; |
1632 | ||
1633 | qos_control = (__le16*) skb_push(skb, 2); | |
1634 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1635 | /* | |
1636 | * Maybe we could actually set some fields here, for now just | |
1637 | * initialise to zero to indicate no special operation. | |
1638 | */ | |
1639 | *qos_control = 0; | |
1640 | } else | |
1641 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1642 | ||
e2ebc74d JB |
1643 | nh_pos += hdrlen; |
1644 | h_pos += hdrlen; | |
1645 | ||
d0f09804 | 1646 | skb->iif = dev->ifindex; |
b0a67179 | 1647 | |
e2ebc74d | 1648 | skb->dev = local->mdev; |
68aae116 SH |
1649 | dev->stats.tx_packets++; |
1650 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1651 | |
1652 | /* Update skb pointers to various headers since this modified frame | |
1653 | * is going to go through Linux networking code that may potentially | |
1654 | * need things like pointer to IP header. */ | |
1655 | skb_set_mac_header(skb, 0); | |
1656 | skb_set_network_header(skb, nh_pos); | |
1657 | skb_set_transport_header(skb, h_pos); | |
1658 | ||
1659 | dev->trans_start = jiffies; | |
1660 | dev_queue_xmit(skb); | |
1661 | ||
1662 | return 0; | |
1663 | ||
1664 | fail: | |
1665 | if (!ret) | |
1666 | dev_kfree_skb(skb); | |
1667 | ||
1668 | return ret; | |
1669 | } | |
1670 | ||
e2ebc74d | 1671 | |
e2530083 JB |
1672 | /* |
1673 | * ieee80211_clear_tx_pending may not be called in a context where | |
1674 | * it is possible that it packets could come in again. | |
1675 | */ | |
e2ebc74d JB |
1676 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1677 | { | |
1678 | int i, j; | |
1679 | struct ieee80211_tx_stored_packet *store; | |
1680 | ||
e2530083 JB |
1681 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1682 | if (!test_bit(i, local->queues_pending)) | |
e2ebc74d JB |
1683 | continue; |
1684 | store = &local->pending_packet[i]; | |
1685 | kfree_skb(store->skb); | |
1686 | for (j = 0; j < store->num_extra_frag; j++) | |
1687 | kfree_skb(store->extra_frag[j]); | |
1688 | kfree(store->extra_frag); | |
e2530083 | 1689 | clear_bit(i, local->queues_pending); |
e2ebc74d JB |
1690 | } |
1691 | } | |
1692 | ||
e2530083 JB |
1693 | /* |
1694 | * Transmit all pending packets. Called from tasklet, locks master device | |
1695 | * TX lock so that no new packets can come in. | |
1696 | */ | |
e2ebc74d JB |
1697 | void ieee80211_tx_pending(unsigned long data) |
1698 | { | |
1699 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1700 | struct net_device *dev = local->mdev; | |
1701 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1702 | struct ieee80211_tx_data tx; |
e2530083 | 1703 | int i, ret; |
e2ebc74d JB |
1704 | |
1705 | netif_tx_lock_bh(dev); | |
e2530083 JB |
1706 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1707 | /* Check that this queue is ok */ | |
f8e79ddd TW |
1708 | if (__netif_subqueue_stopped(local->mdev, i) && |
1709 | !test_bit(i, local->queues_pending_run)) | |
e2ebc74d | 1710 | continue; |
e2530083 JB |
1711 | |
1712 | if (!test_bit(i, local->queues_pending)) { | |
f8e79ddd | 1713 | clear_bit(i, local->queues_pending_run); |
e2530083 | 1714 | ieee80211_wake_queue(&local->hw, i); |
e2ebc74d JB |
1715 | continue; |
1716 | } | |
e2530083 | 1717 | |
f8e79ddd TW |
1718 | clear_bit(i, local->queues_pending_run); |
1719 | netif_start_subqueue(local->mdev, i); | |
1720 | ||
e2ebc74d | 1721 | store = &local->pending_packet[i]; |
5cf121c3 JB |
1722 | tx.extra_frag = store->extra_frag; |
1723 | tx.num_extra_frag = store->num_extra_frag; | |
2e92e6f2 | 1724 | tx.last_frag_rate_idx = store->last_frag_rate_idx; |
badffb72 JS |
1725 | tx.flags = 0; |
1726 | if (store->last_frag_rate_ctrl_probe) | |
5cf121c3 | 1727 | tx.flags |= IEEE80211_TX_PROBE_LAST_FRAG; |
e2ebc74d JB |
1728 | ret = __ieee80211_tx(local, store->skb, &tx); |
1729 | if (ret) { | |
1730 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1731 | store->skb = NULL; | |
1732 | } else { | |
e2530083 JB |
1733 | clear_bit(i, local->queues_pending); |
1734 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1735 | } |
1736 | } | |
1737 | netif_tx_unlock_bh(dev); | |
e2ebc74d JB |
1738 | } |
1739 | ||
1740 | /* functions for drivers to get certain frames */ | |
1741 | ||
1742 | static void ieee80211_beacon_add_tim(struct ieee80211_local *local, | |
1743 | struct ieee80211_if_ap *bss, | |
5dfdaf58 JB |
1744 | struct sk_buff *skb, |
1745 | struct beacon_data *beacon) | |
e2ebc74d JB |
1746 | { |
1747 | u8 *pos, *tim; | |
1748 | int aid0 = 0; | |
1749 | int i, have_bits = 0, n1, n2; | |
1750 | ||
1751 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1752 | * mode. */ | |
e2ebc74d JB |
1753 | if (atomic_read(&bss->num_sta_ps) > 0) |
1754 | /* in the hope that this is faster than | |
1755 | * checking byte-for-byte */ | |
1756 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1757 | IEEE80211_MAX_AID+1); | |
1758 | ||
1759 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1760 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1761 | else |
1762 | bss->dtim_count--; | |
1763 | ||
1764 | tim = pos = (u8 *) skb_put(skb, 6); | |
1765 | *pos++ = WLAN_EID_TIM; | |
1766 | *pos++ = 4; | |
1767 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1768 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1769 | |
1770 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1771 | aid0 = 1; | |
1772 | ||
1773 | if (have_bits) { | |
1774 | /* Find largest even number N1 so that bits numbered 1 through | |
1775 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1776 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1777 | n1 = 0; | |
1778 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1779 | if (bss->tim[i]) { | |
1780 | n1 = i & 0xfe; | |
1781 | break; | |
1782 | } | |
1783 | } | |
1784 | n2 = n1; | |
1785 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1786 | if (bss->tim[i]) { | |
1787 | n2 = i; | |
1788 | break; | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | /* Bitmap control */ | |
1793 | *pos++ = n1 | aid0; | |
1794 | /* Part Virt Bitmap */ | |
1795 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1796 | ||
1797 | tim[1] = n2 - n1 + 4; | |
1798 | skb_put(skb, n2 - n1); | |
1799 | } else { | |
1800 | *pos++ = aid0; /* Bitmap control */ | |
1801 | *pos++ = 0; /* Part Virt Bitmap */ | |
1802 | } | |
e2ebc74d JB |
1803 | } |
1804 | ||
32bfd35d | 1805 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1806 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1807 | { |
1808 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 1809 | struct sk_buff *skb = NULL; |
e039fa4a | 1810 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1811 | struct net_device *bdev; |
1812 | struct ieee80211_sub_if_data *sdata = NULL; | |
1813 | struct ieee80211_if_ap *ap = NULL; | |
9d139c81 | 1814 | struct ieee80211_if_sta *ifsta = NULL; |
1abbe498 | 1815 | struct rate_selection rsel; |
5dfdaf58 | 1816 | struct beacon_data *beacon; |
8318d78a | 1817 | struct ieee80211_supported_band *sband; |
902acc78 | 1818 | struct ieee80211_mgmt *mgmt; |
33b64eb2 | 1819 | int *num_beacons; |
2e92e6f2 | 1820 | enum ieee80211_band band = local->hw.conf.channel->band; |
902acc78 | 1821 | u8 *pos; |
8318d78a | 1822 | |
2e92e6f2 | 1823 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1824 | |
1825 | rcu_read_lock(); | |
e2ebc74d | 1826 | |
32bfd35d JB |
1827 | sdata = vif_to_sdata(vif); |
1828 | bdev = sdata->dev; | |
e2ebc74d | 1829 | |
902acc78 | 1830 | if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
33b64eb2 LCC |
1831 | ap = &sdata->u.ap; |
1832 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1833 | if (ap && beacon) { |
1834 | /* | |
1835 | * headroom, head length, | |
1836 | * tail length and maximum TIM length | |
1837 | */ | |
1838 | skb = dev_alloc_skb(local->tx_headroom + | |
1839 | beacon->head_len + | |
1840 | beacon->tail_len + 256); | |
1841 | if (!skb) | |
1842 | goto out; | |
33b64eb2 | 1843 | |
902acc78 JB |
1844 | skb_reserve(skb, local->tx_headroom); |
1845 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1846 | beacon->head_len); | |
33b64eb2 | 1847 | |
d0709a65 JB |
1848 | /* |
1849 | * Not very nice, but we want to allow the driver to call | |
1850 | * ieee80211_beacon_get() as a response to the set_tim() | |
1851 | * callback. That, however, is already invoked under the | |
1852 | * sta_lock to guarantee consistent and race-free update | |
1853 | * of the tim bitmap in mac80211 and the driver. | |
1854 | */ | |
1855 | if (local->tim_in_locked_section) { | |
1856 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1857 | } else { | |
1858 | unsigned long flags; | |
1859 | ||
1860 | spin_lock_irqsave(&local->sta_lock, flags); | |
1861 | ieee80211_beacon_add_tim(local, ap, skb, beacon); | |
1862 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
1863 | } | |
33b64eb2 | 1864 | |
902acc78 JB |
1865 | if (beacon->tail) |
1866 | memcpy(skb_put(skb, beacon->tail_len), | |
1867 | beacon->tail, beacon->tail_len); | |
33b64eb2 | 1868 | |
902acc78 | 1869 | num_beacons = &ap->num_beacons; |
9d139c81 JB |
1870 | } else |
1871 | goto out; | |
1872 | } else if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { | |
1873 | struct ieee80211_hdr *hdr; | |
1874 | ifsta = &sdata->u.sta; | |
33b64eb2 | 1875 | |
9d139c81 JB |
1876 | if (!ifsta->probe_resp) |
1877 | goto out; | |
1878 | ||
1879 | skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC); | |
1880 | if (!skb) | |
1881 | goto out; | |
1882 | ||
1883 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
1884 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1885 | IEEE80211_STYPE_BEACON); | |
9d139c81 JB |
1886 | |
1887 | num_beacons = &ifsta->num_beacons; | |
902acc78 JB |
1888 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1889 | /* headroom, head length, tail length and maximum TIM length */ | |
1890 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1891 | if (!skb) | |
1892 | goto out; | |
1893 | ||
1894 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1895 | mgmt = (struct ieee80211_mgmt *) | |
1896 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
1897 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
1898 | mgmt->frame_control = |
1899 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
1900 | memset(mgmt->da, 0xff, ETH_ALEN); |
1901 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1902 | /* BSSID is left zeroed, wildcard value */ | |
1903 | mgmt->u.beacon.beacon_int = | |
1904 | cpu_to_le16(local->hw.conf.beacon_int); | |
1905 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
1906 | ||
1907 | pos = skb_put(skb, 2); | |
1908 | *pos++ = WLAN_EID_SSID; | |
1909 | *pos++ = 0x0; | |
1910 | ||
f698d856 | 1911 | mesh_mgmt_ies_add(skb, sdata); |
33b64eb2 | 1912 | |
33b64eb2 | 1913 | num_beacons = &sdata->u.sta.num_beacons; |
9d139c81 JB |
1914 | } else { |
1915 | WARN_ON(1); | |
5dfdaf58 | 1916 | goto out; |
e2ebc74d JB |
1917 | } |
1918 | ||
e039fa4a JB |
1919 | info = IEEE80211_SKB_CB(skb); |
1920 | ||
d0f09804 JB |
1921 | skb->do_not_encrypt = 1; |
1922 | ||
e039fa4a JB |
1923 | info->band = band; |
1924 | rate_control_get_rate(local->mdev, sband, skb, &rsel); | |
e2ebc74d | 1925 | |
e039fa4a JB |
1926 | if (unlikely(rsel.rate_idx < 0)) { |
1927 | if (net_ratelimit()) { | |
1928 | printk(KERN_DEBUG "%s: ieee80211_beacon_get: " | |
1929 | "no rate found\n", | |
1930 | wiphy_name(local->hw.wiphy)); | |
1931 | } | |
1b024165 | 1932 | dev_kfree_skb_any(skb); |
e039fa4a JB |
1933 | skb = NULL; |
1934 | goto out; | |
e2ebc74d | 1935 | } |
e039fa4a JB |
1936 | |
1937 | info->control.vif = vif; | |
1938 | info->tx_rate_idx = rsel.rate_idx; | |
f591fa5d JB |
1939 | |
1940 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
1941 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1942 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e039fa4a JB |
1943 | if (sdata->bss_conf.use_short_preamble && |
1944 | sband->bitrates[rsel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
1945 | info->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE; | |
f591fa5d | 1946 | |
e039fa4a | 1947 | info->antenna_sel_tx = local->hw.conf.antenna_sel_tx; |
e039fa4a | 1948 | info->control.retry_limit = 1; |
f591fa5d | 1949 | |
33b64eb2 LCC |
1950 | (*num_beacons)++; |
1951 | out: | |
5dfdaf58 | 1952 | rcu_read_unlock(); |
e2ebc74d JB |
1953 | return skb; |
1954 | } | |
1955 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
1956 | ||
32bfd35d | 1957 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1958 | const void *frame, size_t frame_len, |
e039fa4a | 1959 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1960 | struct ieee80211_rts *rts) |
1961 | { | |
1962 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1963 | |
065e9605 HH |
1964 | rts->frame_control = |
1965 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
1966 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
1967 | frame_txctl); | |
e2ebc74d JB |
1968 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
1969 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
1970 | } | |
1971 | EXPORT_SYMBOL(ieee80211_rts_get); | |
1972 | ||
32bfd35d | 1973 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 1974 | const void *frame, size_t frame_len, |
e039fa4a | 1975 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
1976 | struct ieee80211_cts *cts) |
1977 | { | |
1978 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 1979 | |
065e9605 HH |
1980 | cts->frame_control = |
1981 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
1982 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
1983 | frame_len, frame_txctl); | |
e2ebc74d JB |
1984 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
1985 | } | |
1986 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
1987 | ||
1988 | struct sk_buff * | |
32bfd35d | 1989 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 1990 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1991 | { |
1992 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 1993 | struct sk_buff *skb = NULL; |
e2ebc74d | 1994 | struct sta_info *sta; |
5cf121c3 | 1995 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
1996 | struct net_device *bdev; |
1997 | struct ieee80211_sub_if_data *sdata; | |
1998 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 1999 | struct beacon_data *beacon; |
e039fa4a | 2000 | struct ieee80211_tx_info *info; |
e2ebc74d | 2001 | |
32bfd35d JB |
2002 | sdata = vif_to_sdata(vif); |
2003 | bdev = sdata->dev; | |
747cf5e9 | 2004 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2005 | |
2006 | if (!bss) | |
e2ebc74d JB |
2007 | return NULL; |
2008 | ||
5dfdaf58 JB |
2009 | rcu_read_lock(); |
2010 | beacon = rcu_dereference(bss->beacon); | |
2011 | ||
747cf5e9 TW |
2012 | if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || !beacon->head) |
2013 | goto out; | |
5dfdaf58 | 2014 | |
e2ebc74d | 2015 | if (bss->dtim_count != 0) |
747cf5e9 | 2016 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2017 | |
e2ebc74d JB |
2018 | while (1) { |
2019 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2020 | if (!skb) | |
747cf5e9 | 2021 | goto out; |
e2ebc74d JB |
2022 | local->total_ps_buffered--; |
2023 | ||
2024 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2025 | struct ieee80211_hdr *hdr = | |
2026 | (struct ieee80211_hdr *) skb->data; | |
2027 | /* more buffered multicast/broadcast frames ==> set | |
2028 | * MoreData flag in IEEE 802.11 header to inform PS | |
2029 | * STAs */ | |
2030 | hdr->frame_control |= | |
2031 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2032 | } | |
2033 | ||
e039fa4a | 2034 | if (!ieee80211_tx_prepare(&tx, skb, local->mdev)) |
e2ebc74d JB |
2035 | break; |
2036 | dev_kfree_skb_any(skb); | |
2037 | } | |
e039fa4a JB |
2038 | |
2039 | info = IEEE80211_SKB_CB(skb); | |
2040 | ||
e2ebc74d | 2041 | sta = tx.sta; |
5cf121c3 JB |
2042 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2043 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2044 | info->band = tx.channel->band; |
e2ebc74d | 2045 | |
97b045d6 | 2046 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2047 | skb = NULL; |
97b045d6 | 2048 | out: |
d0709a65 | 2049 | rcu_read_unlock(); |
e2ebc74d JB |
2050 | |
2051 | return skb; | |
2052 | } | |
2053 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |