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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 | |
97d97b80 | 38 | #define IEEE80211_TX_PENDING 3 |
e2ebc74d JB |
39 | |
40 | /* misc utils */ | |
41 | ||
03f93c3d JB |
42 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, |
43 | int next_frag_len) | |
e2ebc74d JB |
44 | { |
45 | int rate, mrate, erp, dur, i; | |
2e92e6f2 | 46 | struct ieee80211_rate *txrate; |
e2ebc74d | 47 | struct ieee80211_local *local = tx->local; |
8318d78a | 48 | struct ieee80211_supported_band *sband; |
358c8d9d | 49 | struct ieee80211_hdr *hdr; |
e6a9854b JB |
50 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
51 | ||
52 | /* assume HW handles this */ | |
53 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) | |
54 | return 0; | |
55 | ||
56 | /* uh huh? */ | |
57 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) | |
58 | return 0; | |
e2ebc74d | 59 | |
2e92e6f2 | 60 | sband = local->hw.wiphy->bands[tx->channel->band]; |
e6a9854b | 61 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
8318d78a | 62 | |
e6a9854b | 63 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
e2ebc74d JB |
64 | |
65 | /* | |
66 | * data and mgmt (except PS Poll): | |
67 | * - during CFP: 32768 | |
68 | * - during contention period: | |
69 | * if addr1 is group address: 0 | |
70 | * if more fragments = 0 and addr1 is individual address: time to | |
71 | * transmit one ACK plus SIFS | |
72 | * if more fragments = 1 and addr1 is individual address: time to | |
73 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
74 | * | |
75 | * IEEE 802.11, 9.6: | |
76 | * - control response frame (CTS or ACK) shall be transmitted using the | |
77 | * same rate as the immediately previous frame in the frame exchange | |
78 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
79 | * at the highest possible rate belonging to the PHY rates in the | |
80 | * BSSBasicRateSet | |
81 | */ | |
358c8d9d HH |
82 | hdr = (struct ieee80211_hdr *)tx->skb->data; |
83 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
e2ebc74d | 84 | /* TODO: These control frames are not currently sent by |
ccd7b362 | 85 | * mac80211, but should they be implemented, this function |
e2ebc74d JB |
86 | * needs to be updated to support duration field calculation. |
87 | * | |
88 | * RTS: time needed to transmit pending data/mgmt frame plus | |
89 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
90 | * CTS: duration of immediately previous RTS minus time | |
91 | * required to transmit CTS and its SIFS | |
92 | * ACK: 0 if immediately previous directed data/mgmt had | |
93 | * more=0, with more=1 duration in ACK frame is duration | |
94 | * from previous frame minus time needed to transmit ACK | |
95 | * and its SIFS | |
96 | * PS Poll: BIT(15) | BIT(14) | aid | |
97 | */ | |
98 | return 0; | |
99 | } | |
100 | ||
101 | /* data/mgmt */ | |
102 | if (0 /* FIX: data/mgmt during CFP */) | |
03f93c3d | 103 | return cpu_to_le16(32768); |
e2ebc74d JB |
104 | |
105 | if (group_addr) /* Group address as the destination - no ACK */ | |
106 | return 0; | |
107 | ||
108 | /* Individual destination address: | |
109 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
110 | * CTS and ACK frames shall be transmitted using the highest rate in | |
111 | * basic rate set that is less than or equal to the rate of the | |
112 | * immediately previous frame and that is using the same modulation | |
113 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
114 | * the highest mandatory rate of the PHY that is less than or equal to | |
115 | * the rate of the previous frame is used. | |
116 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
117 | */ | |
118 | rate = -1; | |
8318d78a JB |
119 | /* use lowest available if everything fails */ |
120 | mrate = sband->bitrates[0].bitrate; | |
121 | for (i = 0; i < sband->n_bitrates; i++) { | |
122 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
e2ebc74d | 123 | |
8318d78a JB |
124 | if (r->bitrate > txrate->bitrate) |
125 | break; | |
e2ebc74d | 126 | |
bda3933a | 127 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
8318d78a JB |
128 | rate = r->bitrate; |
129 | ||
130 | switch (sband->band) { | |
131 | case IEEE80211_BAND_2GHZ: { | |
132 | u32 flag; | |
133 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
134 | flag = IEEE80211_RATE_MANDATORY_G; | |
135 | else | |
136 | flag = IEEE80211_RATE_MANDATORY_B; | |
137 | if (r->flags & flag) | |
138 | mrate = r->bitrate; | |
139 | break; | |
140 | } | |
141 | case IEEE80211_BAND_5GHZ: | |
142 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
143 | mrate = r->bitrate; | |
144 | break; | |
145 | case IEEE80211_NUM_BANDS: | |
146 | WARN_ON(1); | |
147 | break; | |
148 | } | |
e2ebc74d JB |
149 | } |
150 | if (rate == -1) { | |
151 | /* No matching basic rate found; use highest suitable mandatory | |
152 | * PHY rate */ | |
153 | rate = mrate; | |
154 | } | |
155 | ||
156 | /* Time needed to transmit ACK | |
157 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
158 | * to closest integer */ | |
159 | ||
160 | dur = ieee80211_frame_duration(local, 10, rate, erp, | |
bda3933a | 161 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
162 | |
163 | if (next_frag_len) { | |
164 | /* Frame is fragmented: duration increases with time needed to | |
165 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
166 | dur *= 2; /* ACK + SIFS */ | |
167 | /* next fragment */ | |
168 | dur += ieee80211_frame_duration(local, next_frag_len, | |
8318d78a | 169 | txrate->bitrate, erp, |
bda3933a | 170 | tx->sdata->vif.bss_conf.use_short_preamble); |
e2ebc74d JB |
171 | } |
172 | ||
03f93c3d | 173 | return cpu_to_le16(dur); |
e2ebc74d JB |
174 | } |
175 | ||
133b8226 JB |
176 | static int inline is_ieee80211_device(struct ieee80211_local *local, |
177 | struct net_device *dev) | |
e2ebc74d | 178 | { |
133b8226 | 179 | return local == wdev_priv(dev->ieee80211_ptr); |
e2ebc74d JB |
180 | } |
181 | ||
182 | /* tx handlers */ | |
183 | ||
d9e8a70f | 184 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 185 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
e2ebc74d | 186 | { |
358c8d9d | 187 | |
e039fa4a | 188 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 189 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e2ebc74d JB |
190 | u32 sta_flags; |
191 | ||
e039fa4a | 192 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
9ae54c84 | 193 | return TX_CONTINUE; |
58d4185e | 194 | |
c2b13452 | 195 | if (unlikely(tx->local->sw_scanning) && |
358c8d9d | 196 | !ieee80211_is_probe_req(hdr->frame_control)) |
9ae54c84 | 197 | return TX_DROP; |
e2ebc74d | 198 | |
05c914fe | 199 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
33b64eb2 LCC |
200 | return TX_CONTINUE; |
201 | ||
5cf121c3 | 202 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
9ae54c84 | 203 | return TX_CONTINUE; |
e2ebc74d | 204 | |
07346f81 | 205 | sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; |
e2ebc74d | 206 | |
5cf121c3 | 207 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
e2ebc74d | 208 | if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && |
05c914fe | 209 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
358c8d9d | 210 | ieee80211_is_data(hdr->frame_control))) { |
e2ebc74d JB |
211 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
212 | printk(KERN_DEBUG "%s: dropped data frame to not " | |
0c68ae26 JB |
213 | "associated station %pM\n", |
214 | tx->dev->name, hdr->addr1); | |
e2ebc74d JB |
215 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
216 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
9ae54c84 | 217 | return TX_DROP; |
e2ebc74d JB |
218 | } |
219 | } else { | |
358c8d9d | 220 | if (unlikely(ieee80211_is_data(hdr->frame_control) && |
e2ebc74d | 221 | tx->local->num_sta == 0 && |
05c914fe | 222 | tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { |
e2ebc74d JB |
223 | /* |
224 | * No associated STAs - no need to send multicast | |
225 | * frames. | |
226 | */ | |
9ae54c84 | 227 | return TX_DROP; |
e2ebc74d | 228 | } |
9ae54c84 | 229 | return TX_CONTINUE; |
e2ebc74d JB |
230 | } |
231 | ||
9ae54c84 | 232 | return TX_CONTINUE; |
e2ebc74d JB |
233 | } |
234 | ||
e2ebc74d JB |
235 | /* This function is called whenever the AP is about to exceed the maximum limit |
236 | * of buffered frames for power saving STAs. This situation should not really | |
237 | * happen often during normal operation, so dropping the oldest buffered packet | |
238 | * from each queue should be OK to make some room for new frames. */ | |
239 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
240 | { | |
241 | int total = 0, purged = 0; | |
242 | struct sk_buff *skb; | |
243 | struct ieee80211_sub_if_data *sdata; | |
244 | struct sta_info *sta; | |
245 | ||
79010420 JB |
246 | /* |
247 | * virtual interfaces are protected by RCU | |
248 | */ | |
249 | rcu_read_lock(); | |
250 | ||
251 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
e2ebc74d | 252 | struct ieee80211_if_ap *ap; |
05c914fe | 253 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
e2ebc74d JB |
254 | continue; |
255 | ap = &sdata->u.ap; | |
256 | skb = skb_dequeue(&ap->ps_bc_buf); | |
257 | if (skb) { | |
258 | purged++; | |
259 | dev_kfree_skb(skb); | |
260 | } | |
261 | total += skb_queue_len(&ap->ps_bc_buf); | |
262 | } | |
e2ebc74d | 263 | |
d0709a65 | 264 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
e2ebc74d JB |
265 | skb = skb_dequeue(&sta->ps_tx_buf); |
266 | if (skb) { | |
267 | purged++; | |
268 | dev_kfree_skb(skb); | |
269 | } | |
270 | total += skb_queue_len(&sta->ps_tx_buf); | |
271 | } | |
d0709a65 JB |
272 | |
273 | rcu_read_unlock(); | |
e2ebc74d JB |
274 | |
275 | local->total_ps_buffered = total; | |
54223995 | 276 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 277 | printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", |
dd1cd4c6 | 278 | wiphy_name(local->hw.wiphy), purged); |
f4ea83dd | 279 | #endif |
e2ebc74d JB |
280 | } |
281 | ||
9ae54c84 | 282 | static ieee80211_tx_result |
5cf121c3 | 283 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 284 | { |
e039fa4a | 285 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 286 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e039fa4a | 287 | |
7d54d0dd JB |
288 | /* |
289 | * broadcast/multicast frame | |
290 | * | |
291 | * If any of the associated stations is in power save mode, | |
292 | * the frame is buffered to be sent after DTIM beacon frame. | |
293 | * This is done either by the hardware or us. | |
294 | */ | |
295 | ||
3e122be0 JB |
296 | /* powersaving STAs only in AP/VLAN mode */ |
297 | if (!tx->sdata->bss) | |
298 | return TX_CONTINUE; | |
299 | ||
300 | /* no buffering for ordered frames */ | |
358c8d9d | 301 | if (ieee80211_has_order(hdr->frame_control)) |
9ae54c84 | 302 | return TX_CONTINUE; |
7d54d0dd JB |
303 | |
304 | /* no stations in PS mode */ | |
305 | if (!atomic_read(&tx->sdata->bss->num_sta_ps)) | |
9ae54c84 | 306 | return TX_CONTINUE; |
7d54d0dd JB |
307 | |
308 | /* buffered in mac80211 */ | |
309 | if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { | |
e2ebc74d JB |
310 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
311 | purge_old_ps_buffers(tx->local); | |
312 | if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= | |
313 | AP_MAX_BC_BUFFER) { | |
54223995 | 314 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d JB |
315 | if (net_ratelimit()) { |
316 | printk(KERN_DEBUG "%s: BC TX buffer full - " | |
317 | "dropping the oldest frame\n", | |
318 | tx->dev->name); | |
319 | } | |
f4ea83dd | 320 | #endif |
e2ebc74d JB |
321 | dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); |
322 | } else | |
323 | tx->local->total_ps_buffered++; | |
324 | skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); | |
9ae54c84 | 325 | return TX_QUEUED; |
e2ebc74d JB |
326 | } |
327 | ||
7d54d0dd | 328 | /* buffered in hardware */ |
e039fa4a | 329 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
7d54d0dd | 330 | |
9ae54c84 | 331 | return TX_CONTINUE; |
e2ebc74d JB |
332 | } |
333 | ||
fb733336 JM |
334 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
335 | struct sk_buff *skb) | |
336 | { | |
337 | if (!ieee80211_is_mgmt(fc)) | |
338 | return 0; | |
339 | ||
340 | if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) | |
341 | return 0; | |
342 | ||
343 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) | |
344 | skb->data)) | |
345 | return 0; | |
346 | ||
347 | return 1; | |
348 | } | |
349 | ||
9ae54c84 | 350 | static ieee80211_tx_result |
5cf121c3 | 351 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d JB |
352 | { |
353 | struct sta_info *sta = tx->sta; | |
e039fa4a | 354 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 355 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
07346f81 | 356 | u32 staflags; |
e2ebc74d | 357 | |
358c8d9d | 358 | if (unlikely(!sta || ieee80211_is_probe_resp(hdr->frame_control))) |
9ae54c84 | 359 | return TX_CONTINUE; |
e2ebc74d | 360 | |
07346f81 JB |
361 | staflags = get_sta_flags(sta); |
362 | ||
363 | if (unlikely((staflags & WLAN_STA_PS) && | |
364 | !(staflags & WLAN_STA_PSPOLL))) { | |
e2ebc74d | 365 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 366 | printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " |
e2ebc74d | 367 | "before %d)\n", |
0c68ae26 | 368 | sta->sta.addr, sta->sta.aid, |
e2ebc74d JB |
369 | skb_queue_len(&sta->ps_tx_buf)); |
370 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
e2ebc74d JB |
371 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
372 | purge_old_ps_buffers(tx->local); | |
373 | if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { | |
374 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); | |
54223995 | 375 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
e2ebc74d | 376 | if (net_ratelimit()) { |
0c68ae26 | 377 | printk(KERN_DEBUG "%s: STA %pM TX " |
e2ebc74d | 378 | "buffer full - dropping oldest frame\n", |
0c68ae26 | 379 | tx->dev->name, sta->sta.addr); |
e2ebc74d | 380 | } |
f4ea83dd | 381 | #endif |
e2ebc74d JB |
382 | dev_kfree_skb(old); |
383 | } else | |
384 | tx->local->total_ps_buffered++; | |
004c872e | 385 | |
e2ebc74d | 386 | /* Queue frame to be sent after STA sends an PS Poll frame */ |
004c872e JB |
387 | if (skb_queue_empty(&sta->ps_tx_buf)) |
388 | sta_info_set_tim_bit(sta); | |
389 | ||
e039fa4a | 390 | info->control.jiffies = jiffies; |
e2ebc74d | 391 | skb_queue_tail(&sta->ps_tx_buf, tx->skb); |
9ae54c84 | 392 | return TX_QUEUED; |
e2ebc74d JB |
393 | } |
394 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
07346f81 | 395 | else if (unlikely(test_sta_flags(sta, WLAN_STA_PS))) { |
0c68ae26 | 396 | printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " |
e2ebc74d | 397 | "set -> send frame\n", tx->dev->name, |
0c68ae26 | 398 | sta->sta.addr); |
e2ebc74d JB |
399 | } |
400 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
07346f81 | 401 | clear_sta_flags(sta, WLAN_STA_PSPOLL); |
e2ebc74d | 402 | |
9ae54c84 | 403 | return TX_CONTINUE; |
e2ebc74d JB |
404 | } |
405 | ||
d9e8a70f | 406 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 407 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
e2ebc74d | 408 | { |
5cf121c3 | 409 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
9ae54c84 | 410 | return TX_CONTINUE; |
e2ebc74d | 411 | |
5cf121c3 | 412 | if (tx->flags & IEEE80211_TX_UNICAST) |
e2ebc74d JB |
413 | return ieee80211_tx_h_unicast_ps_buf(tx); |
414 | else | |
415 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
416 | } | |
417 | ||
d9e8a70f | 418 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 419 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
e2ebc74d | 420 | { |
d4e46a3d | 421 | struct ieee80211_key *key; |
e039fa4a | 422 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
358c8d9d | 423 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
d4e46a3d | 424 | |
d0f09804 | 425 | if (unlikely(tx->skb->do_not_encrypt)) |
e2ebc74d | 426 | tx->key = NULL; |
d4e46a3d JB |
427 | else if (tx->sta && (key = rcu_dereference(tx->sta->key))) |
428 | tx->key = key; | |
3cfcf6ac JM |
429 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
430 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) | |
431 | tx->key = key; | |
d4e46a3d JB |
432 | else if ((key = rcu_dereference(tx->sdata->default_key))) |
433 | tx->key = key; | |
e2ebc74d | 434 | else if (tx->sdata->drop_unencrypted && |
d0f09804 | 435 | (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && |
e0463f50 JM |
436 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
437 | (!ieee80211_is_robust_mgmt_frame(hdr) || | |
438 | (ieee80211_is_action(hdr->frame_control) && | |
439 | tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { | |
e2ebc74d | 440 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
9ae54c84 | 441 | return TX_DROP; |
176e4f84 | 442 | } else |
e2ebc74d JB |
443 | tx->key = NULL; |
444 | ||
445 | if (tx->key) { | |
446 | tx->key->tx_rx_count++; | |
011bfcc4 | 447 | /* TODO: add threshold stuff again */ |
176e4f84 JB |
448 | |
449 | switch (tx->key->conf.alg) { | |
450 | case ALG_WEP: | |
358c8d9d | 451 | if (ieee80211_is_auth(hdr->frame_control)) |
176e4f84 JB |
452 | break; |
453 | case ALG_TKIP: | |
358c8d9d | 454 | if (!ieee80211_is_data_present(hdr->frame_control)) |
176e4f84 JB |
455 | tx->key = NULL; |
456 | break; | |
fb733336 JM |
457 | case ALG_CCMP: |
458 | if (!ieee80211_is_data_present(hdr->frame_control) && | |
459 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
460 | tx->skb)) | |
461 | tx->key = NULL; | |
462 | break; | |
3cfcf6ac JM |
463 | case ALG_AES_CMAC: |
464 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
465 | tx->key = NULL; | |
466 | break; | |
176e4f84 | 467 | } |
e2ebc74d JB |
468 | } |
469 | ||
176e4f84 | 470 | if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
d0f09804 | 471 | tx->skb->do_not_encrypt = 1; |
176e4f84 | 472 | |
9ae54c84 | 473 | return TX_CONTINUE; |
e2ebc74d JB |
474 | } |
475 | ||
d9e8a70f | 476 | static ieee80211_tx_result debug_noinline |
5cf121c3 | 477 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
e2ebc74d | 478 | { |
e039fa4a | 479 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
e6a9854b JB |
480 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
481 | struct ieee80211_supported_band *sband; | |
482 | struct ieee80211_rate *rate; | |
483 | int i, len; | |
484 | bool inval = false, rts = false, short_preamble = false; | |
485 | struct ieee80211_tx_rate_control txrc; | |
8318d78a | 486 | |
e6a9854b | 487 | memset(&txrc, 0, sizeof(txrc)); |
e2ebc74d | 488 | |
e6a9854b | 489 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
58d4185e | 490 | |
e6a9854b JB |
491 | len = min_t(int, tx->skb->len + FCS_LEN, |
492 | tx->local->fragmentation_threshold); | |
493 | ||
494 | /* set up the tx rate control struct we give the RC algo */ | |
495 | txrc.hw = local_to_hw(tx->local); | |
496 | txrc.sband = sband; | |
497 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
498 | txrc.skb = tx->skb; | |
499 | txrc.reported_rate.idx = -1; | |
500 | txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx; | |
501 | ||
502 | /* set up RTS protection if desired */ | |
503 | if (tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD && | |
504 | len > tx->local->rts_threshold) { | |
505 | txrc.rts = rts = true; | |
e2ebc74d | 506 | } |
e2ebc74d | 507 | |
e6a9854b JB |
508 | /* |
509 | * Use short preamble if the BSS can handle it, but not for | |
510 | * management frames unless we know the receiver can handle | |
511 | * that -- the management frame might be to a station that | |
512 | * just wants a probe response. | |
513 | */ | |
514 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
515 | (ieee80211_is_data(hdr->frame_control) || | |
516 | (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
517 | txrc.short_preamble = short_preamble = true; | |
e2ebc74d | 518 | |
2e92e6f2 | 519 | |
e6a9854b JB |
520 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
521 | ||
522 | if (unlikely(info->control.rates[0].idx < 0)) | |
523 | return TX_DROP; | |
524 | ||
525 | if (txrc.reported_rate.idx < 0) | |
526 | txrc.reported_rate = info->control.rates[0]; | |
e2ebc74d | 527 | |
e039fa4a | 528 | if (tx->sta) |
e6a9854b | 529 | tx->sta->last_tx_rate = txrc.reported_rate; |
e039fa4a | 530 | |
e6a9854b JB |
531 | if (unlikely(!info->control.rates[0].count)) |
532 | info->control.rates[0].count = 1; | |
e2ebc74d | 533 | |
e6a9854b JB |
534 | if (is_multicast_ether_addr(hdr->addr1)) { |
535 | /* | |
536 | * XXX: verify the rate is in the basic rateset | |
537 | */ | |
538 | return TX_CONTINUE; | |
e2ebc74d JB |
539 | } |
540 | ||
e6a9854b JB |
541 | /* |
542 | * set up the RTS/CTS rate as the fastest basic rate | |
543 | * that is not faster than the data rate | |
544 | * | |
545 | * XXX: Should this check all retry rates? | |
546 | */ | |
547 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
548 | s8 baserate = 0; | |
549 | ||
550 | rate = &sband->bitrates[info->control.rates[0].idx]; | |
551 | ||
552 | for (i = 0; i < sband->n_bitrates; i++) { | |
553 | /* must be a basic rate */ | |
554 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) | |
555 | continue; | |
556 | /* must not be faster than the data rate */ | |
557 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
558 | continue; | |
559 | /* maximum */ | |
560 | if (sband->bitrates[baserate].bitrate < | |
561 | sband->bitrates[i].bitrate) | |
562 | baserate = i; | |
563 | } | |
564 | ||
565 | info->control.rts_cts_rate_idx = baserate; | |
7e9ed188 DD |
566 | } |
567 | ||
e6a9854b JB |
568 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
569 | /* | |
570 | * make sure there's no valid rate following | |
571 | * an invalid one, just in case drivers don't | |
572 | * take the API seriously to stop at -1. | |
573 | */ | |
574 | if (inval) { | |
575 | info->control.rates[i].idx = -1; | |
576 | continue; | |
577 | } | |
578 | if (info->control.rates[i].idx < 0) { | |
579 | inval = true; | |
580 | continue; | |
581 | } | |
8318d78a | 582 | |
e6a9854b JB |
583 | /* |
584 | * For now assume MCS is already set up correctly, this | |
585 | * needs to be fixed. | |
586 | */ | |
587 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { | |
588 | WARN_ON(info->control.rates[i].idx > 76); | |
589 | continue; | |
590 | } | |
e2ebc74d | 591 | |
e6a9854b JB |
592 | /* set up RTS protection if desired */ |
593 | if (rts) | |
594 | info->control.rates[i].flags |= | |
595 | IEEE80211_TX_RC_USE_RTS_CTS; | |
8318d78a | 596 | |
e6a9854b | 597 | /* RC is busted */ |
075cbc9e S |
598 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
599 | sband->n_bitrates)) { | |
e6a9854b JB |
600 | info->control.rates[i].idx = -1; |
601 | continue; | |
8318d78a | 602 | } |
e2ebc74d | 603 | |
e6a9854b JB |
604 | rate = &sband->bitrates[info->control.rates[i].idx]; |
605 | ||
606 | /* set up short preamble */ | |
607 | if (short_preamble && | |
608 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
609 | info->control.rates[i].flags |= | |
610 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
611 | ||
612 | /* set up G protection */ | |
613 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && | |
614 | rate->flags & IEEE80211_RATE_ERP_G) | |
615 | info->control.rates[i].flags |= | |
616 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
e2ebc74d JB |
617 | } |
618 | ||
e6a9854b JB |
619 | return TX_CONTINUE; |
620 | } | |
621 | ||
622 | static ieee80211_tx_result debug_noinline | |
623 | ieee80211_tx_h_misc(struct ieee80211_tx_data *tx) | |
624 | { | |
625 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
626 | ||
e2454948 | 627 | if (tx->sta) |
17741cdc | 628 | info->control.sta = &tx->sta->sta; |
e2454948 JB |
629 | |
630 | return TX_CONTINUE; | |
631 | } | |
632 | ||
f591fa5d JB |
633 | static ieee80211_tx_result debug_noinline |
634 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
635 | { | |
636 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
637 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
638 | u16 *seq; | |
639 | u8 *qc; | |
640 | int tid; | |
641 | ||
25d834e1 JB |
642 | /* |
643 | * Packet injection may want to control the sequence | |
644 | * number, if we have no matching interface then we | |
645 | * neither assign one ourselves nor ask the driver to. | |
646 | */ | |
647 | if (unlikely(!info->control.vif)) | |
648 | return TX_CONTINUE; | |
649 | ||
f591fa5d JB |
650 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
651 | return TX_CONTINUE; | |
652 | ||
653 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
654 | return TX_CONTINUE; | |
655 | ||
94778280 JB |
656 | /* |
657 | * Anything but QoS data that has a sequence number field | |
658 | * (is long enough) gets a sequence number from the global | |
659 | * counter. | |
660 | */ | |
f591fa5d | 661 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
94778280 | 662 | /* driver should assign sequence number */ |
f591fa5d | 663 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
94778280 JB |
664 | /* for pure STA mode without beacons, we can do it */ |
665 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
666 | tx->sdata->sequence_number += 0x10; | |
667 | tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ; | |
f591fa5d JB |
668 | return TX_CONTINUE; |
669 | } | |
670 | ||
671 | /* | |
672 | * This should be true for injected/management frames only, for | |
673 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
674 | * above since they are not QoS-data frames. | |
675 | */ | |
676 | if (!tx->sta) | |
677 | return TX_CONTINUE; | |
678 | ||
679 | /* include per-STA, per-TID sequence counter */ | |
680 | ||
681 | qc = ieee80211_get_qos_ctl(hdr); | |
682 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
683 | seq = &tx->sta->tid_seq[tid]; | |
684 | ||
685 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
686 | ||
687 | /* Increase the sequence number. */ | |
688 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
689 | ||
690 | return TX_CONTINUE; | |
691 | } | |
692 | ||
d9e8a70f | 693 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
694 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
695 | { | |
8b30b1fe | 696 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
065e9605 | 697 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
e2454948 JB |
698 | size_t hdrlen, per_fragm, num_fragm, payload_len, left; |
699 | struct sk_buff **frags, *first, *frag; | |
700 | int i; | |
701 | u16 seq; | |
702 | u8 *pos; | |
703 | int frag_threshold = tx->local->fragmentation_threshold; | |
704 | ||
705 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) | |
706 | return TX_CONTINUE; | |
707 | ||
eefce91a JB |
708 | /* |
709 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
8d5e0d58 RR |
710 | * This scenario is handled in __ieee80211_tx_prepare but extra |
711 | * caution taken here as fragmented ampdu may cause Tx stop. | |
eefce91a | 712 | */ |
8b30b1fe | 713 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
eefce91a JB |
714 | return TX_DROP; |
715 | ||
e2454948 JB |
716 | first = tx->skb; |
717 | ||
065e9605 | 718 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2454948 JB |
719 | payload_len = first->len - hdrlen; |
720 | per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
721 | num_fragm = DIV_ROUND_UP(payload_len, per_fragm); | |
722 | ||
723 | frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); | |
724 | if (!frags) | |
725 | goto fail; | |
726 | ||
727 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
728 | seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; | |
729 | pos = first->data + hdrlen + per_fragm; | |
730 | left = payload_len - per_fragm; | |
731 | for (i = 0; i < num_fragm - 1; i++) { | |
732 | struct ieee80211_hdr *fhdr; | |
733 | size_t copylen; | |
734 | ||
735 | if (left <= 0) | |
736 | goto fail; | |
737 | ||
738 | /* reserve enough extra head and tail room for possible | |
739 | * encryption */ | |
740 | frag = frags[i] = | |
741 | dev_alloc_skb(tx->local->tx_headroom + | |
742 | frag_threshold + | |
743 | IEEE80211_ENCRYPT_HEADROOM + | |
744 | IEEE80211_ENCRYPT_TAILROOM); | |
745 | if (!frag) | |
746 | goto fail; | |
e6a9854b | 747 | |
e2454948 JB |
748 | /* Make sure that all fragments use the same priority so |
749 | * that they end up using the same TX queue */ | |
750 | frag->priority = first->priority; | |
e6a9854b | 751 | |
e2454948 JB |
752 | skb_reserve(frag, tx->local->tx_headroom + |
753 | IEEE80211_ENCRYPT_HEADROOM); | |
e6a9854b JB |
754 | |
755 | /* copy TX information */ | |
756 | info = IEEE80211_SKB_CB(frag); | |
757 | memcpy(info, first->cb, sizeof(frag->cb)); | |
758 | ||
759 | /* copy/fill in 802.11 header */ | |
e2454948 JB |
760 | fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); |
761 | memcpy(fhdr, first->data, hdrlen); | |
e2454948 | 762 | fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); |
e6a9854b JB |
763 | |
764 | if (i == num_fragm - 2) { | |
765 | /* clear MOREFRAGS bit for the last fragment */ | |
766 | fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); | |
767 | } else { | |
768 | /* | |
769 | * No multi-rate retries for fragmented frames, that | |
770 | * would completely throw off the NAV at other STAs. | |
771 | */ | |
772 | info->control.rates[1].idx = -1; | |
773 | info->control.rates[2].idx = -1; | |
774 | info->control.rates[3].idx = -1; | |
775 | info->control.rates[4].idx = -1; | |
776 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
777 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
778 | } | |
779 | ||
780 | /* copy data */ | |
e2454948 JB |
781 | copylen = left > per_fragm ? per_fragm : left; |
782 | memcpy(skb_put(frag, copylen), pos, copylen); | |
e6a9854b | 783 | |
03f93c3d | 784 | skb_copy_queue_mapping(frag, first); |
e6a9854b | 785 | |
d0f09804 | 786 | frag->do_not_encrypt = first->do_not_encrypt; |
e2454948 JB |
787 | |
788 | pos += copylen; | |
789 | left -= copylen; | |
e2ebc74d | 790 | } |
e2454948 JB |
791 | skb_trim(first, hdrlen + per_fragm); |
792 | ||
793 | tx->num_extra_frag = num_fragm - 1; | |
794 | tx->extra_frag = frags; | |
e2ebc74d | 795 | |
9ae54c84 | 796 | return TX_CONTINUE; |
e2454948 JB |
797 | |
798 | fail: | |
e2454948 JB |
799 | if (frags) { |
800 | for (i = 0; i < num_fragm - 1; i++) | |
801 | if (frags[i]) | |
802 | dev_kfree_skb(frags[i]); | |
803 | kfree(frags); | |
804 | } | |
805 | I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); | |
806 | return TX_DROP; | |
e2ebc74d JB |
807 | } |
808 | ||
d9e8a70f | 809 | static ieee80211_tx_result debug_noinline |
e2454948 JB |
810 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
811 | { | |
812 | if (!tx->key) | |
813 | return TX_CONTINUE; | |
814 | ||
815 | switch (tx->key->conf.alg) { | |
816 | case ALG_WEP: | |
817 | return ieee80211_crypto_wep_encrypt(tx); | |
818 | case ALG_TKIP: | |
819 | return ieee80211_crypto_tkip_encrypt(tx); | |
820 | case ALG_CCMP: | |
821 | return ieee80211_crypto_ccmp_encrypt(tx); | |
3cfcf6ac JM |
822 | case ALG_AES_CMAC: |
823 | return ieee80211_crypto_aes_cmac_encrypt(tx); | |
e2454948 JB |
824 | } |
825 | ||
826 | /* not reached */ | |
827 | WARN_ON(1); | |
828 | return TX_DROP; | |
829 | } | |
830 | ||
d9e8a70f | 831 | static ieee80211_tx_result debug_noinline |
03f93c3d JB |
832 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
833 | { | |
834 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
835 | int next_len, i; | |
836 | int group_addr = is_multicast_ether_addr(hdr->addr1); | |
837 | ||
838 | if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) { | |
839 | hdr->duration_id = ieee80211_duration(tx, group_addr, 0); | |
840 | return TX_CONTINUE; | |
841 | } | |
842 | ||
843 | hdr->duration_id = ieee80211_duration(tx, group_addr, | |
844 | tx->extra_frag[0]->len); | |
845 | ||
846 | for (i = 0; i < tx->num_extra_frag; i++) { | |
e6a9854b | 847 | if (i + 1 < tx->num_extra_frag) |
03f93c3d | 848 | next_len = tx->extra_frag[i + 1]->len; |
e6a9854b | 849 | else |
03f93c3d | 850 | next_len = 0; |
03f93c3d JB |
851 | |
852 | hdr = (struct ieee80211_hdr *)tx->extra_frag[i]->data; | |
853 | hdr->duration_id = ieee80211_duration(tx, 0, next_len); | |
854 | } | |
855 | ||
856 | return TX_CONTINUE; | |
857 | } | |
858 | ||
d9e8a70f | 859 | static ieee80211_tx_result debug_noinline |
e2454948 | 860 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
e2ebc74d | 861 | { |
9e72ebd6 | 862 | int i; |
e2ebc74d | 863 | |
9e72ebd6 JB |
864 | if (!tx->sta) |
865 | return TX_CONTINUE; | |
e2ebc74d | 866 | |
9e72ebd6 JB |
867 | tx->sta->tx_packets++; |
868 | tx->sta->tx_fragments++; | |
869 | tx->sta->tx_bytes += tx->skb->len; | |
5cf121c3 | 870 | if (tx->extra_frag) { |
9e72ebd6 JB |
871 | tx->sta->tx_fragments += tx->num_extra_frag; |
872 | for (i = 0; i < tx->num_extra_frag; i++) | |
873 | tx->sta->tx_bytes += tx->extra_frag[i]->len; | |
e2454948 JB |
874 | } |
875 | ||
9ae54c84 | 876 | return TX_CONTINUE; |
e2ebc74d JB |
877 | } |
878 | ||
e2ebc74d | 879 | |
e2ebc74d JB |
880 | /* actual transmit path */ |
881 | ||
882 | /* | |
883 | * deal with packet injection down monitor interface | |
884 | * with Radiotap Header -- only called for monitor mode interface | |
885 | */ | |
9ae54c84 | 886 | static ieee80211_tx_result |
5cf121c3 | 887 | __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, |
58d4185e | 888 | struct sk_buff *skb) |
e2ebc74d JB |
889 | { |
890 | /* | |
891 | * this is the moment to interpret and discard the radiotap header that | |
892 | * must be at the start of the packet injected in Monitor mode | |
893 | * | |
894 | * Need to take some care with endian-ness since radiotap | |
895 | * args are little-endian | |
896 | */ | |
897 | ||
898 | struct ieee80211_radiotap_iterator iterator; | |
899 | struct ieee80211_radiotap_header *rthdr = | |
900 | (struct ieee80211_radiotap_header *) skb->data; | |
8318d78a | 901 | struct ieee80211_supported_band *sband; |
e2ebc74d JB |
902 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); |
903 | ||
2e92e6f2 | 904 | sband = tx->local->hw.wiphy->bands[tx->channel->band]; |
8318d78a | 905 | |
d0f09804 | 906 | skb->do_not_encrypt = 1; |
5cf121c3 | 907 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
908 | |
909 | /* | |
910 | * for every radiotap entry that is present | |
911 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
912 | * entries present, or -EINVAL on error) | |
913 | */ | |
914 | ||
915 | while (!ret) { | |
e2ebc74d JB |
916 | ret = ieee80211_radiotap_iterator_next(&iterator); |
917 | ||
918 | if (ret) | |
919 | continue; | |
920 | ||
921 | /* see if this argument is something we can use */ | |
922 | switch (iterator.this_arg_index) { | |
923 | /* | |
924 | * You must take care when dereferencing iterator.this_arg | |
925 | * for multibyte types... the pointer is not aligned. Use | |
926 | * get_unaligned((type *)iterator.this_arg) to dereference | |
927 | * iterator.this_arg for type "type" safely on all arches. | |
928 | */ | |
e2ebc74d JB |
929 | case IEEE80211_RADIOTAP_FLAGS: |
930 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
931 | /* | |
932 | * this indicates that the skb we have been | |
933 | * handed has the 32-bit FCS CRC at the end... | |
934 | * we should react to that by snipping it off | |
935 | * because it will be recomputed and added | |
936 | * on transmission | |
937 | */ | |
938 | if (skb->len < (iterator.max_length + FCS_LEN)) | |
9ae54c84 | 939 | return TX_DROP; |
e2ebc74d JB |
940 | |
941 | skb_trim(skb, skb->len - FCS_LEN); | |
942 | } | |
58d4185e | 943 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
d0f09804 | 944 | tx->skb->do_not_encrypt = 0; |
58d4185e | 945 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
5cf121c3 | 946 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
947 | break; |
948 | ||
58d4185e JB |
949 | /* |
950 | * Please update the file | |
951 | * Documentation/networking/mac80211-injection.txt | |
952 | * when parsing new fields here. | |
953 | */ | |
954 | ||
e2ebc74d JB |
955 | default: |
956 | break; | |
957 | } | |
958 | } | |
959 | ||
960 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
9ae54c84 | 961 | return TX_DROP; |
e2ebc74d JB |
962 | |
963 | /* | |
964 | * remove the radiotap header | |
965 | * iterator->max_length was sanity-checked against | |
966 | * skb->len by iterator init | |
967 | */ | |
968 | skb_pull(skb, iterator.max_length); | |
969 | ||
9ae54c84 | 970 | return TX_CONTINUE; |
e2ebc74d JB |
971 | } |
972 | ||
58d4185e JB |
973 | /* |
974 | * initialises @tx | |
975 | */ | |
9ae54c84 | 976 | static ieee80211_tx_result |
5cf121c3 | 977 | __ieee80211_tx_prepare(struct ieee80211_tx_data *tx, |
e2ebc74d | 978 | struct sk_buff *skb, |
e039fa4a | 979 | struct net_device *dev) |
e2ebc74d JB |
980 | { |
981 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
58d4185e | 982 | struct ieee80211_hdr *hdr; |
e2ebc74d | 983 | struct ieee80211_sub_if_data *sdata; |
e039fa4a | 984 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 985 | |
8b30b1fe S |
986 | int hdrlen, tid; |
987 | u8 *qc, *state; | |
e2ebc74d JB |
988 | |
989 | memset(tx, 0, sizeof(*tx)); | |
990 | tx->skb = skb; | |
991 | tx->dev = dev; /* use original interface */ | |
992 | tx->local = local; | |
993 | tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
e039fa4a | 994 | tx->channel = local->hw.conf.channel; |
e2ebc74d | 995 | /* |
58d4185e JB |
996 | * Set this flag (used below to indicate "automatic fragmentation"), |
997 | * it will be cleared/left by radiotap as desired. | |
e2ebc74d | 998 | */ |
5cf121c3 | 999 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
e2ebc74d JB |
1000 | |
1001 | /* process and remove the injection radiotap header */ | |
1002 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
25d834e1 | 1003 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) { |
9ae54c84 JB |
1004 | if (__ieee80211_parse_tx_radiotap(tx, skb) == TX_DROP) |
1005 | return TX_DROP; | |
58d4185e | 1006 | |
e2ebc74d | 1007 | /* |
58d4185e JB |
1008 | * __ieee80211_parse_tx_radiotap has now removed |
1009 | * the radiotap header that was present and pre-filled | |
1010 | * 'tx' with tx control information. | |
e2ebc74d | 1011 | */ |
e2ebc74d JB |
1012 | } |
1013 | ||
58d4185e JB |
1014 | hdr = (struct ieee80211_hdr *) skb->data; |
1015 | ||
24338793 | 1016 | tx->sta = sta_info_get(local, hdr->addr1); |
58d4185e | 1017 | |
8b30b1fe S |
1018 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control)) { |
1019 | qc = ieee80211_get_qos_ctl(hdr); | |
1020 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1021 | ||
1022 | state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; | |
1023 | if (*state == HT_AGG_STATE_OPERATIONAL) | |
1024 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
1025 | } | |
1026 | ||
badffb72 | 1027 | if (is_multicast_ether_addr(hdr->addr1)) { |
5cf121c3 | 1028 | tx->flags &= ~IEEE80211_TX_UNICAST; |
e039fa4a | 1029 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1030 | } else { |
5cf121c3 | 1031 | tx->flags |= IEEE80211_TX_UNICAST; |
e039fa4a | 1032 | info->flags &= ~IEEE80211_TX_CTL_NO_ACK; |
badffb72 | 1033 | } |
58d4185e | 1034 | |
5cf121c3 JB |
1035 | if (tx->flags & IEEE80211_TX_FRAGMENTED) { |
1036 | if ((tx->flags & IEEE80211_TX_UNICAST) && | |
58d4185e | 1037 | skb->len + FCS_LEN > local->fragmentation_threshold && |
8d5e0d58 | 1038 | !(info->flags & IEEE80211_TX_CTL_AMPDU)) |
5cf121c3 | 1039 | tx->flags |= IEEE80211_TX_FRAGMENTED; |
58d4185e | 1040 | else |
5cf121c3 | 1041 | tx->flags &= ~IEEE80211_TX_FRAGMENTED; |
58d4185e JB |
1042 | } |
1043 | ||
e2ebc74d | 1044 | if (!tx->sta) |
e039fa4a | 1045 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
07346f81 | 1046 | else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
e039fa4a | 1047 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
58d4185e | 1048 | |
b73d70ad | 1049 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
e2ebc74d JB |
1050 | if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { |
1051 | u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; | |
1052 | tx->ethertype = (pos[0] << 8) | pos[1]; | |
1053 | } | |
e039fa4a | 1054 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
e2ebc74d | 1055 | |
9ae54c84 | 1056 | return TX_CONTINUE; |
e2ebc74d JB |
1057 | } |
1058 | ||
32bfd35d | 1059 | /* |
58d4185e JB |
1060 | * NB: @tx is uninitialised when passed in here |
1061 | */ | |
133b8226 JB |
1062 | static int ieee80211_tx_prepare(struct ieee80211_local *local, |
1063 | struct ieee80211_tx_data *tx, | |
1064 | struct sk_buff *skb) | |
e2ebc74d | 1065 | { |
e2ebc74d JB |
1066 | struct net_device *dev; |
1067 | ||
d0f09804 | 1068 | dev = dev_get_by_index(&init_net, skb->iif); |
133b8226 | 1069 | if (unlikely(dev && !is_ieee80211_device(local, dev))) { |
e2ebc74d JB |
1070 | dev_put(dev); |
1071 | dev = NULL; | |
1072 | } | |
1073 | if (unlikely(!dev)) | |
1074 | return -ENODEV; | |
58d4185e | 1075 | /* initialises tx with control */ |
e039fa4a | 1076 | __ieee80211_tx_prepare(tx, skb, dev); |
32bfd35d | 1077 | dev_put(dev); |
e2ebc74d JB |
1078 | return 0; |
1079 | } | |
1080 | ||
1081 | static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, | |
5cf121c3 | 1082 | struct ieee80211_tx_data *tx) |
e2ebc74d | 1083 | { |
f8e79ddd | 1084 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1085 | int ret, i; |
1086 | ||
e2ebc74d | 1087 | if (skb) { |
f8e79ddd | 1088 | if (netif_subqueue_stopped(local->mdev, skb)) |
97d97b80 | 1089 | return IEEE80211_TX_PENDING; |
f8e79ddd | 1090 | |
e039fa4a | 1091 | ret = local->ops->tx(local_to_hw(local), skb); |
e2ebc74d JB |
1092 | if (ret) |
1093 | return IEEE80211_TX_AGAIN; | |
1094 | local->mdev->trans_start = jiffies; | |
1095 | ieee80211_led_tx(local, 1); | |
1096 | } | |
5cf121c3 | 1097 | if (tx->extra_frag) { |
5cf121c3 JB |
1098 | for (i = 0; i < tx->num_extra_frag; i++) { |
1099 | if (!tx->extra_frag[i]) | |
e2ebc74d | 1100 | continue; |
e039fa4a | 1101 | info = IEEE80211_SKB_CB(tx->extra_frag[i]); |
e6a9854b | 1102 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
e039fa4a | 1103 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
e2530083 JB |
1104 | if (netif_subqueue_stopped(local->mdev, |
1105 | tx->extra_frag[i])) | |
e2ebc74d | 1106 | return IEEE80211_TX_FRAG_AGAIN; |
e2ebc74d | 1107 | |
e2ebc74d | 1108 | ret = local->ops->tx(local_to_hw(local), |
e039fa4a | 1109 | tx->extra_frag[i]); |
e2ebc74d JB |
1110 | if (ret) |
1111 | return IEEE80211_TX_FRAG_AGAIN; | |
1112 | local->mdev->trans_start = jiffies; | |
1113 | ieee80211_led_tx(local, 1); | |
5cf121c3 | 1114 | tx->extra_frag[i] = NULL; |
e2ebc74d | 1115 | } |
5cf121c3 JB |
1116 | kfree(tx->extra_frag); |
1117 | tx->extra_frag = NULL; | |
e2ebc74d JB |
1118 | } |
1119 | return IEEE80211_TX_OK; | |
1120 | } | |
1121 | ||
97b045d6 JB |
1122 | /* |
1123 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1124 | * frame was dropped or queued. | |
1125 | */ | |
1126 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1127 | { | |
97b045d6 | 1128 | struct sk_buff *skb = tx->skb; |
97b045d6 JB |
1129 | ieee80211_tx_result res = TX_DROP; |
1130 | int i; | |
1131 | ||
d9e8a70f JB |
1132 | #define CALL_TXH(txh) \ |
1133 | res = txh(tx); \ | |
1134 | if (res != TX_CONTINUE) \ | |
1135 | goto txh_done; | |
1136 | ||
1137 | CALL_TXH(ieee80211_tx_h_check_assoc) | |
d9e8a70f JB |
1138 | CALL_TXH(ieee80211_tx_h_ps_buf) |
1139 | CALL_TXH(ieee80211_tx_h_select_key) | |
1140 | CALL_TXH(ieee80211_tx_h_michael_mic_add) | |
1141 | CALL_TXH(ieee80211_tx_h_rate_ctrl) | |
1142 | CALL_TXH(ieee80211_tx_h_misc) | |
f591fa5d | 1143 | CALL_TXH(ieee80211_tx_h_sequence) |
d9e8a70f JB |
1144 | CALL_TXH(ieee80211_tx_h_fragment) |
1145 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1146 | CALL_TXH(ieee80211_tx_h_encrypt) | |
1147 | CALL_TXH(ieee80211_tx_h_calculate_duration) | |
1148 | CALL_TXH(ieee80211_tx_h_stats) | |
1149 | #undef CALL_TXH | |
97b045d6 | 1150 | |
d9e8a70f | 1151 | txh_done: |
97b045d6 | 1152 | if (unlikely(res == TX_DROP)) { |
5479d0e7 | 1153 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
97b045d6 JB |
1154 | dev_kfree_skb(skb); |
1155 | for (i = 0; i < tx->num_extra_frag; i++) | |
1156 | if (tx->extra_frag[i]) | |
1157 | dev_kfree_skb(tx->extra_frag[i]); | |
1158 | kfree(tx->extra_frag); | |
1159 | return -1; | |
1160 | } else if (unlikely(res == TX_QUEUED)) { | |
5479d0e7 | 1161 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
97b045d6 JB |
1162 | return -1; |
1163 | } | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
e039fa4a | 1168 | static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb) |
e2ebc74d JB |
1169 | { |
1170 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1171 | struct sta_info *sta; | |
5cf121c3 | 1172 | struct ieee80211_tx_data tx; |
97b045d6 | 1173 | ieee80211_tx_result res_prepare; |
e039fa4a | 1174 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e2ebc74d | 1175 | int ret, i; |
e2530083 | 1176 | u16 queue; |
e2ebc74d | 1177 | |
e2530083 JB |
1178 | queue = skb_get_queue_mapping(skb); |
1179 | ||
1180 | WARN_ON(test_bit(queue, local->queues_pending)); | |
e2ebc74d JB |
1181 | |
1182 | if (unlikely(skb->len < 10)) { | |
1183 | dev_kfree_skb(skb); | |
1184 | return 0; | |
1185 | } | |
1186 | ||
d0709a65 JB |
1187 | rcu_read_lock(); |
1188 | ||
58d4185e | 1189 | /* initialises tx */ |
e039fa4a | 1190 | res_prepare = __ieee80211_tx_prepare(&tx, skb, dev); |
e2ebc74d | 1191 | |
9ae54c84 | 1192 | if (res_prepare == TX_DROP) { |
e2ebc74d | 1193 | dev_kfree_skb(skb); |
d0709a65 | 1194 | rcu_read_unlock(); |
e2ebc74d JB |
1195 | return 0; |
1196 | } | |
1197 | ||
1198 | sta = tx.sta; | |
5cf121c3 | 1199 | tx.channel = local->hw.conf.channel; |
e039fa4a | 1200 | info->band = tx.channel->band; |
e2ebc74d | 1201 | |
97b045d6 JB |
1202 | if (invoke_tx_handlers(&tx)) |
1203 | goto out; | |
e2ebc74d | 1204 | |
e2ebc74d JB |
1205 | retry: |
1206 | ret = __ieee80211_tx(local, skb, &tx); | |
1207 | if (ret) { | |
eefce91a JB |
1208 | struct ieee80211_tx_stored_packet *store; |
1209 | ||
1210 | /* | |
1211 | * Since there are no fragmented frames on A-MPDU | |
1212 | * queues, there's no reason for a driver to reject | |
1213 | * a frame there, warn and drop it. | |
1214 | */ | |
97d97b80 VN |
1215 | if (ret != IEEE80211_TX_PENDING) |
1216 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) | |
1217 | goto drop; | |
eefce91a JB |
1218 | |
1219 | store = &local->pending_packet[queue]; | |
e2ebc74d JB |
1220 | |
1221 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1222 | skb = NULL; | |
f8e79ddd | 1223 | |
e2530083 | 1224 | set_bit(queue, local->queues_pending); |
e2ebc74d | 1225 | smp_mb(); |
e2530083 JB |
1226 | /* |
1227 | * When the driver gets out of buffers during sending of | |
1228 | * fragments and calls ieee80211_stop_queue, the netif | |
1229 | * subqueue is stopped. There is, however, a small window | |
1230 | * in which the PENDING bit is not yet set. If a buffer | |
e2ebc74d JB |
1231 | * gets available in that window (i.e. driver calls |
1232 | * ieee80211_wake_queue), we would end up with ieee80211_tx | |
e2530083 | 1233 | * called with the PENDING bit still set. Prevent this by |
e2ebc74d | 1234 | * continuing transmitting here when that situation is |
e2530083 JB |
1235 | * possible to have happened. |
1236 | */ | |
1237 | if (!__netif_subqueue_stopped(local->mdev, queue)) { | |
1238 | clear_bit(queue, local->queues_pending); | |
e2ebc74d JB |
1239 | goto retry; |
1240 | } | |
e2ebc74d | 1241 | store->skb = skb; |
5cf121c3 JB |
1242 | store->extra_frag = tx.extra_frag; |
1243 | store->num_extra_frag = tx.num_extra_frag; | |
e2ebc74d | 1244 | } |
97b045d6 | 1245 | out: |
d4e46a3d | 1246 | rcu_read_unlock(); |
e2ebc74d JB |
1247 | return 0; |
1248 | ||
1249 | drop: | |
1250 | if (skb) | |
1251 | dev_kfree_skb(skb); | |
5cf121c3 JB |
1252 | for (i = 0; i < tx.num_extra_frag; i++) |
1253 | if (tx.extra_frag[i]) | |
1254 | dev_kfree_skb(tx.extra_frag[i]); | |
1255 | kfree(tx.extra_frag); | |
d4e46a3d | 1256 | rcu_read_unlock(); |
e2ebc74d JB |
1257 | return 0; |
1258 | } | |
1259 | ||
1260 | /* device xmit handlers */ | |
1261 | ||
23c0752a JB |
1262 | static int ieee80211_skb_resize(struct ieee80211_local *local, |
1263 | struct sk_buff *skb, | |
1264 | int head_need, bool may_encrypt) | |
1265 | { | |
1266 | int tail_need = 0; | |
1267 | ||
1268 | /* | |
1269 | * This could be optimised, devices that do full hardware | |
1270 | * crypto (including TKIP MMIC) need no tailroom... But we | |
1271 | * have no drivers for such devices currently. | |
1272 | */ | |
1273 | if (may_encrypt) { | |
1274 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1275 | tail_need -= skb_tailroom(skb); | |
1276 | tail_need = max_t(int, tail_need, 0); | |
1277 | } | |
1278 | ||
1279 | if (head_need || tail_need) { | |
1280 | /* Sorry. Can't account for this any more */ | |
1281 | skb_orphan(skb); | |
1282 | } | |
1283 | ||
1284 | if (skb_header_cloned(skb)) | |
1285 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1286 | else | |
1287 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1288 | ||
1289 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1290 | printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", | |
1291 | wiphy_name(local->hw.wiphy)); | |
1292 | return -ENOMEM; | |
1293 | } | |
1294 | ||
1295 | /* update truesize too */ | |
1296 | skb->truesize += head_need + tail_need; | |
1297 | ||
1298 | return 0; | |
1299 | } | |
1300 | ||
8ef9dad3 | 1301 | int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev) |
e2ebc74d | 1302 | { |
133b8226 JB |
1303 | struct ieee80211_master_priv *mpriv = netdev_priv(dev); |
1304 | struct ieee80211_local *local = mpriv->local; | |
e039fa4a | 1305 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e32f85f7 | 1306 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e2ebc74d JB |
1307 | struct net_device *odev = NULL; |
1308 | struct ieee80211_sub_if_data *osdata; | |
1309 | int headroom; | |
23c0752a | 1310 | bool may_encrypt; |
25d834e1 JB |
1311 | enum { |
1312 | NOT_MONITOR, | |
1313 | FOUND_SDATA, | |
1314 | UNKNOWN_ADDRESS, | |
1315 | } monitor_iface = NOT_MONITOR; | |
e2ebc74d JB |
1316 | int ret; |
1317 | ||
d0f09804 JB |
1318 | if (skb->iif) |
1319 | odev = dev_get_by_index(&init_net, skb->iif); | |
133b8226 | 1320 | if (unlikely(odev && !is_ieee80211_device(local, odev))) { |
e2ebc74d JB |
1321 | dev_put(odev); |
1322 | odev = NULL; | |
1323 | } | |
1324 | if (unlikely(!odev)) { | |
1325 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1326 | printk(KERN_DEBUG "%s: Discarded packet with nonexistent " | |
1327 | "originating device\n", dev->name); | |
1328 | #endif | |
1329 | dev_kfree_skb(skb); | |
1330 | return 0; | |
1331 | } | |
e039fa4a | 1332 | |
4be8c387 | 1333 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
46f2c4bd | 1334 | local->hw.conf.dynamic_ps_timeout > 0) { |
d063ed0f VN |
1335 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
1336 | ieee80211_stop_queues_by_reason(&local->hw, | |
1337 | IEEE80211_QUEUE_STOP_REASON_PS); | |
1338 | queue_work(local->hw.workqueue, | |
1339 | &local->dynamic_ps_disable_work); | |
1340 | } | |
1341 | ||
1342 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
46f2c4bd | 1343 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
d063ed0f VN |
1344 | } |
1345 | ||
d0f09804 JB |
1346 | memset(info, 0, sizeof(*info)); |
1347 | ||
1348 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1349 | ||
e2ebc74d JB |
1350 | osdata = IEEE80211_DEV_TO_SUB_IF(odev); |
1351 | ||
e32f85f7 LCC |
1352 | if (ieee80211_vif_is_mesh(&osdata->vif) && |
1353 | ieee80211_is_data(hdr->frame_control)) { | |
f74b6a54 RR |
1354 | if (is_multicast_ether_addr(hdr->addr3)) |
1355 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1356 | else | |
5dc306f3 BC |
1357 | if (mesh_nexthop_lookup(skb, osdata)) { |
1358 | dev_put(odev); | |
1359 | return 0; | |
1360 | } | |
f74b6a54 RR |
1361 | if (memcmp(odev->dev_addr, hdr->addr4, ETH_ALEN) != 0) |
1362 | IEEE80211_IFSTA_MESH_CTR_INC(&osdata->u.mesh, | |
1363 | fwded_frames); | |
25d834e1 JB |
1364 | } else if (unlikely(osdata->vif.type == NL80211_IFTYPE_MONITOR)) { |
1365 | struct ieee80211_sub_if_data *sdata; | |
25d834e1 JB |
1366 | int hdrlen; |
1367 | u16 len_rthdr; | |
1368 | ||
1369 | info->flags |= IEEE80211_TX_CTL_INJECTED; | |
1370 | monitor_iface = UNKNOWN_ADDRESS; | |
1371 | ||
1372 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1373 | hdr = (struct ieee80211_hdr *)skb->data + len_rthdr; | |
1374 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1375 | ||
1376 | /* check the header is complete in the frame */ | |
1377 | if (likely(skb->len >= len_rthdr + hdrlen)) { | |
1378 | /* | |
1379 | * We process outgoing injected frames that have a | |
1380 | * local address we handle as though they are our | |
1381 | * own frames. | |
1382 | * This code here isn't entirely correct, the local | |
1383 | * MAC address is not necessarily enough to find | |
1384 | * the interface to use; for that proper VLAN/WDS | |
1385 | * support we will need a different mechanism. | |
1386 | */ | |
1387 | ||
1388 | rcu_read_lock(); | |
1389 | list_for_each_entry_rcu(sdata, &local->interfaces, | |
1390 | list) { | |
1391 | if (!netif_running(sdata->dev)) | |
1392 | continue; | |
f1b33cb1 JB |
1393 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
1394 | continue; | |
25d834e1 JB |
1395 | if (compare_ether_addr(sdata->dev->dev_addr, |
1396 | hdr->addr2)) { | |
1397 | dev_hold(sdata->dev); | |
1398 | dev_put(odev); | |
1399 | osdata = sdata; | |
1400 | odev = osdata->dev; | |
1401 | skb->iif = sdata->dev->ifindex; | |
1402 | monitor_iface = FOUND_SDATA; | |
1403 | break; | |
1404 | } | |
1405 | } | |
1406 | rcu_read_unlock(); | |
1407 | } | |
e32f85f7 LCC |
1408 | } |
1409 | ||
d0f09804 | 1410 | may_encrypt = !skb->do_not_encrypt; |
23c0752a JB |
1411 | |
1412 | headroom = osdata->local->tx_headroom; | |
1413 | if (may_encrypt) | |
1414 | headroom += IEEE80211_ENCRYPT_HEADROOM; | |
1415 | headroom -= skb_headroom(skb); | |
1416 | headroom = max_t(int, 0, headroom); | |
1417 | ||
1418 | if (ieee80211_skb_resize(osdata->local, skb, headroom, may_encrypt)) { | |
1419 | dev_kfree_skb(skb); | |
1420 | dev_put(odev); | |
1421 | return 0; | |
e2ebc74d JB |
1422 | } |
1423 | ||
30613070 JB |
1424 | if (osdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
1425 | osdata = container_of(osdata->bss, | |
1426 | struct ieee80211_sub_if_data, | |
1427 | u.ap); | |
25d834e1 JB |
1428 | if (likely(monitor_iface != UNKNOWN_ADDRESS)) |
1429 | info->control.vif = &osdata->vif; | |
e039fa4a | 1430 | ret = ieee80211_tx(odev, skb); |
e2ebc74d JB |
1431 | dev_put(odev); |
1432 | ||
1433 | return ret; | |
1434 | } | |
1435 | ||
1436 | int ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1437 | struct net_device *dev) | |
1438 | { | |
1439 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
47f4d887 | 1440 | struct ieee80211_channel *chan = local->hw.conf.channel; |
e2ebc74d JB |
1441 | struct ieee80211_radiotap_header *prthdr = |
1442 | (struct ieee80211_radiotap_header *)skb->data; | |
9b8a74e3 | 1443 | u16 len_rthdr; |
e2ebc74d | 1444 | |
47f4d887 LR |
1445 | /* |
1446 | * Frame injection is not allowed if beaconing is not allowed | |
1447 | * or if we need radar detection. Beaconing is usually not allowed when | |
1448 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1449 | * Passive scan is also used in world regulatory domains where | |
1450 | * your country is not known and as such it should be treated as | |
1451 | * NO TX unless the channel is explicitly allowed in which case | |
1452 | * your current regulatory domain would not have the passive scan | |
1453 | * flag. | |
1454 | * | |
1455 | * Since AP mode uses monitor interfaces to inject/TX management | |
1456 | * frames we can make AP mode the exception to this rule once it | |
1457 | * supports radar detection as its implementation can deal with | |
1458 | * radar detection by itself. We can do that later by adding a | |
1459 | * monitor flag interfaces used for AP support. | |
1460 | */ | |
1461 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | | |
1462 | IEEE80211_CHAN_PASSIVE_SCAN))) | |
1463 | goto fail; | |
1464 | ||
9b8a74e3 AG |
1465 | /* check for not even having the fixed radiotap header part */ |
1466 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1467 | goto fail; /* too short to be possibly valid */ | |
1468 | ||
1469 | /* is it a header version we can trust to find length from? */ | |
1470 | if (unlikely(prthdr->it_version)) | |
1471 | goto fail; /* only version 0 is supported */ | |
1472 | ||
1473 | /* then there must be a radiotap header with a length we can use */ | |
1474 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1475 | ||
1476 | /* does the skb contain enough to deliver on the alleged length? */ | |
1477 | if (unlikely(skb->len < len_rthdr)) | |
1478 | goto fail; /* skb too short for claimed rt header extent */ | |
e2ebc74d JB |
1479 | |
1480 | skb->dev = local->mdev; | |
1481 | ||
9b8a74e3 | 1482 | /* needed because we set skb device to master */ |
d0f09804 | 1483 | skb->iif = dev->ifindex; |
9b8a74e3 | 1484 | |
d0f09804 JB |
1485 | /* sometimes we do encrypt injected frames, will be fixed |
1486 | * up in radiotap parser if not wanted */ | |
1487 | skb->do_not_encrypt = 0; | |
e2ebc74d | 1488 | |
e2ebc74d JB |
1489 | /* |
1490 | * fix up the pointers accounting for the radiotap | |
1491 | * header still being in there. We are being given | |
1492 | * a precooked IEEE80211 header so no need for | |
1493 | * normal processing | |
1494 | */ | |
9b8a74e3 | 1495 | skb_set_mac_header(skb, len_rthdr); |
e2ebc74d | 1496 | /* |
9b8a74e3 AG |
1497 | * these are just fixed to the end of the rt area since we |
1498 | * don't have any better information and at this point, nobody cares | |
e2ebc74d | 1499 | */ |
9b8a74e3 AG |
1500 | skb_set_network_header(skb, len_rthdr); |
1501 | skb_set_transport_header(skb, len_rthdr); | |
e2ebc74d | 1502 | |
9b8a74e3 AG |
1503 | /* pass the radiotap header up to the next stage intact */ |
1504 | dev_queue_xmit(skb); | |
e2ebc74d | 1505 | return NETDEV_TX_OK; |
9b8a74e3 AG |
1506 | |
1507 | fail: | |
1508 | dev_kfree_skb(skb); | |
1509 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
e2ebc74d JB |
1510 | } |
1511 | ||
1512 | /** | |
1513 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1514 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1515 | * @skb: packet to be sent | |
1516 | * @dev: incoming interface | |
1517 | * | |
1518 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1519 | * not be freed, and caller is responsible for either retrying later or freeing | |
1520 | * skb). | |
1521 | * | |
1522 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1523 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1524 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1525 | * transmission (through low-level driver). | |
1526 | */ | |
1527 | int ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1528 | struct net_device *dev) | |
1529 | { | |
133b8226 JB |
1530 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1531 | struct ieee80211_local *local = sdata->local; | |
e2ebc74d | 1532 | int ret = 1, head_need; |
065e9605 HH |
1533 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1534 | __le16 fc; | |
e2ebc74d | 1535 | struct ieee80211_hdr hdr; |
33b64eb2 | 1536 | struct ieee80211s_hdr mesh_hdr; |
e2ebc74d JB |
1537 | const u8 *encaps_data; |
1538 | int encaps_len, skip_header_bytes; | |
e8bf9649 | 1539 | int nh_pos, h_pos; |
e2ebc74d | 1540 | struct sta_info *sta; |
ce3edf6d | 1541 | u32 sta_flags = 0; |
e2ebc74d | 1542 | |
e2ebc74d | 1543 | if (unlikely(skb->len < ETH_HLEN)) { |
e2ebc74d JB |
1544 | ret = 0; |
1545 | goto fail; | |
1546 | } | |
1547 | ||
1548 | nh_pos = skb_network_header(skb) - skb->data; | |
1549 | h_pos = skb_transport_header(skb) - skb->data; | |
1550 | ||
1551 | /* convert Ethernet header to proper 802.11 header (based on | |
1552 | * operation mode) */ | |
1553 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
065e9605 | 1554 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
e2ebc74d | 1555 | |
51fb61e7 | 1556 | switch (sdata->vif.type) { |
05c914fe JB |
1557 | case NL80211_IFTYPE_AP: |
1558 | case NL80211_IFTYPE_AP_VLAN: | |
065e9605 | 1559 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
e2ebc74d JB |
1560 | /* DA BSSID SA */ |
1561 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1562 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1563 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1564 | hdrlen = 24; | |
cf966838 | 1565 | break; |
05c914fe | 1566 | case NL80211_IFTYPE_WDS: |
065e9605 | 1567 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1568 | /* RA TA DA SA */ |
1569 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1570 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1571 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1572 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1573 | hdrlen = 30; | |
cf966838 | 1574 | break; |
33b64eb2 | 1575 | #ifdef CONFIG_MAC80211_MESH |
05c914fe | 1576 | case NL80211_IFTYPE_MESH_POINT: |
065e9605 | 1577 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
472dbc45 | 1578 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
e32f85f7 | 1579 | /* Do not send frames with mesh_ttl == 0 */ |
472dbc45 | 1580 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
e32f85f7 LCC |
1581 | ret = 0; |
1582 | goto fail; | |
33b64eb2 | 1583 | } |
79617dee Y |
1584 | memset(&mesh_hdr, 0, sizeof(mesh_hdr)); |
1585 | ||
1586 | if (compare_ether_addr(dev->dev_addr, | |
1587 | skb->data + ETH_ALEN) == 0) { | |
1588 | /* RA TA DA SA */ | |
1589 | memset(hdr.addr1, 0, ETH_ALEN); | |
1590 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1591 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1592 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1593 | meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata); | |
1594 | } else { | |
1595 | /* packet from other interface */ | |
1596 | struct mesh_path *mppath; | |
1597 | ||
1598 | memset(hdr.addr1, 0, ETH_ALEN); | |
1599 | memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); | |
1600 | memcpy(hdr.addr4, dev->dev_addr, ETH_ALEN); | |
1601 | ||
1602 | if (is_multicast_ether_addr(skb->data)) | |
1603 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1604 | else { | |
1605 | rcu_read_lock(); | |
1606 | mppath = mpp_path_lookup(skb->data, sdata); | |
1607 | if (mppath) | |
1608 | memcpy(hdr.addr3, mppath->mpp, ETH_ALEN); | |
1609 | else | |
1610 | memset(hdr.addr3, 0xff, ETH_ALEN); | |
1611 | rcu_read_unlock(); | |
1612 | } | |
1613 | ||
1614 | mesh_hdr.flags |= MESH_FLAGS_AE_A5_A6; | |
1615 | mesh_hdr.ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; | |
1616 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &mesh_hdr.seqnum); | |
1617 | memcpy(mesh_hdr.eaddr1, skb->data, ETH_ALEN); | |
1618 | memcpy(mesh_hdr.eaddr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1619 | sdata->u.mesh.mesh_seqnum++; | |
1620 | meshhdrlen = 18; | |
1621 | } | |
33b64eb2 LCC |
1622 | hdrlen = 30; |
1623 | break; | |
1624 | #endif | |
05c914fe | 1625 | case NL80211_IFTYPE_STATION: |
065e9605 | 1626 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
e2ebc74d JB |
1627 | /* BSSID SA DA */ |
1628 | memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); | |
1629 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1630 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1631 | hdrlen = 24; | |
cf966838 | 1632 | break; |
05c914fe | 1633 | case NL80211_IFTYPE_ADHOC: |
e2ebc74d JB |
1634 | /* DA SA BSSID */ |
1635 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1636 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1637 | memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); | |
1638 | hdrlen = 24; | |
cf966838 JB |
1639 | break; |
1640 | default: | |
e2ebc74d JB |
1641 | ret = 0; |
1642 | goto fail; | |
1643 | } | |
1644 | ||
7d185b8b JB |
1645 | /* |
1646 | * There's no need to try to look up the destination | |
1647 | * if it is a multicast address (which can only happen | |
1648 | * in AP mode) | |
1649 | */ | |
1650 | if (!is_multicast_ether_addr(hdr.addr1)) { | |
d0709a65 | 1651 | rcu_read_lock(); |
7d185b8b | 1652 | sta = sta_info_get(local, hdr.addr1); |
d0709a65 | 1653 | if (sta) |
07346f81 | 1654 | sta_flags = get_sta_flags(sta); |
d0709a65 | 1655 | rcu_read_unlock(); |
e2ebc74d JB |
1656 | } |
1657 | ||
3434fbd3 | 1658 | /* receiver and we are QoS enabled, use a QoS type frame */ |
e2530083 JB |
1659 | if (sta_flags & WLAN_STA_WME && |
1660 | ieee80211_num_regular_queues(&local->hw) >= 4) { | |
065e9605 | 1661 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
ce3edf6d JB |
1662 | hdrlen += 2; |
1663 | } | |
1664 | ||
1665 | /* | |
238814fd JB |
1666 | * Drop unicast frames to unauthorised stations unless they are |
1667 | * EAPOL frames from the local station. | |
ce3edf6d | 1668 | */ |
e32f85f7 LCC |
1669 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
1670 | unlikely(!is_multicast_ether_addr(hdr.addr1) && | |
33b64eb2 LCC |
1671 | !(sta_flags & WLAN_STA_AUTHORIZED) && |
1672 | !(ethertype == ETH_P_PAE && | |
ce3edf6d JB |
1673 | compare_ether_addr(dev->dev_addr, |
1674 | skb->data + ETH_ALEN) == 0))) { | |
1675 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
ce3edf6d | 1676 | if (net_ratelimit()) |
0c68ae26 | 1677 | printk(KERN_DEBUG "%s: dropped frame to %pM" |
ce3edf6d | 1678 | " (unauthorized port)\n", dev->name, |
0c68ae26 | 1679 | hdr.addr1); |
ce3edf6d JB |
1680 | #endif |
1681 | ||
1682 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
1683 | ||
1684 | ret = 0; | |
1685 | goto fail; | |
1686 | } | |
1687 | ||
065e9605 | 1688 | hdr.frame_control = fc; |
e2ebc74d JB |
1689 | hdr.duration_id = 0; |
1690 | hdr.seq_ctrl = 0; | |
1691 | ||
1692 | skip_header_bytes = ETH_HLEN; | |
1693 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
1694 | encaps_data = bridge_tunnel_header; | |
1695 | encaps_len = sizeof(bridge_tunnel_header); | |
1696 | skip_header_bytes -= 2; | |
1697 | } else if (ethertype >= 0x600) { | |
1698 | encaps_data = rfc1042_header; | |
1699 | encaps_len = sizeof(rfc1042_header); | |
1700 | skip_header_bytes -= 2; | |
1701 | } else { | |
1702 | encaps_data = NULL; | |
1703 | encaps_len = 0; | |
1704 | } | |
1705 | ||
1706 | skb_pull(skb, skip_header_bytes); | |
1707 | nh_pos -= skip_header_bytes; | |
1708 | h_pos -= skip_header_bytes; | |
1709 | ||
23c0752a | 1710 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
e2ebc74d | 1711 | |
23c0752a JB |
1712 | /* |
1713 | * So we need to modify the skb header and hence need a copy of | |
1714 | * that. The head_need variable above doesn't, so far, include | |
1715 | * the needed header space that we don't need right away. If we | |
1716 | * can, then we don't reallocate right now but only after the | |
1717 | * frame arrives at the master device (if it does...) | |
1718 | * | |
1719 | * If we cannot, however, then we will reallocate to include all | |
1720 | * the ever needed space. Also, if we need to reallocate it anyway, | |
1721 | * make it big enough for everything we may ever need. | |
1722 | */ | |
e2ebc74d | 1723 | |
3a5be7d4 | 1724 | if (head_need > 0 || skb_cloned(skb)) { |
23c0752a JB |
1725 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
1726 | head_need += local->tx_headroom; | |
1727 | head_need = max_t(int, 0, head_need); | |
1728 | if (ieee80211_skb_resize(local, skb, head_need, true)) | |
e2ebc74d | 1729 | goto fail; |
e2ebc74d JB |
1730 | } |
1731 | ||
1732 | if (encaps_data) { | |
1733 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
1734 | nh_pos += encaps_len; | |
1735 | h_pos += encaps_len; | |
1736 | } | |
c29b9b9b | 1737 | |
33b64eb2 LCC |
1738 | if (meshhdrlen > 0) { |
1739 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
1740 | nh_pos += meshhdrlen; | |
1741 | h_pos += meshhdrlen; | |
1742 | } | |
1743 | ||
065e9605 | 1744 | if (ieee80211_is_data_qos(fc)) { |
c29b9b9b JB |
1745 | __le16 *qos_control; |
1746 | ||
1747 | qos_control = (__le16*) skb_push(skb, 2); | |
1748 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
1749 | /* | |
1750 | * Maybe we could actually set some fields here, for now just | |
1751 | * initialise to zero to indicate no special operation. | |
1752 | */ | |
1753 | *qos_control = 0; | |
1754 | } else | |
1755 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
1756 | ||
e2ebc74d JB |
1757 | nh_pos += hdrlen; |
1758 | h_pos += hdrlen; | |
1759 | ||
d0f09804 | 1760 | skb->iif = dev->ifindex; |
b0a67179 | 1761 | |
e2ebc74d | 1762 | skb->dev = local->mdev; |
68aae116 SH |
1763 | dev->stats.tx_packets++; |
1764 | dev->stats.tx_bytes += skb->len; | |
e2ebc74d JB |
1765 | |
1766 | /* Update skb pointers to various headers since this modified frame | |
1767 | * is going to go through Linux networking code that may potentially | |
1768 | * need things like pointer to IP header. */ | |
1769 | skb_set_mac_header(skb, 0); | |
1770 | skb_set_network_header(skb, nh_pos); | |
1771 | skb_set_transport_header(skb, h_pos); | |
1772 | ||
1773 | dev->trans_start = jiffies; | |
1774 | dev_queue_xmit(skb); | |
1775 | ||
1776 | return 0; | |
1777 | ||
1778 | fail: | |
1779 | if (!ret) | |
1780 | dev_kfree_skb(skb); | |
1781 | ||
1782 | return ret; | |
1783 | } | |
1784 | ||
e2ebc74d | 1785 | |
e2530083 JB |
1786 | /* |
1787 | * ieee80211_clear_tx_pending may not be called in a context where | |
1788 | * it is possible that it packets could come in again. | |
1789 | */ | |
e2ebc74d JB |
1790 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
1791 | { | |
1792 | int i, j; | |
1793 | struct ieee80211_tx_stored_packet *store; | |
1794 | ||
e2530083 JB |
1795 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1796 | if (!test_bit(i, local->queues_pending)) | |
e2ebc74d JB |
1797 | continue; |
1798 | store = &local->pending_packet[i]; | |
1799 | kfree_skb(store->skb); | |
1800 | for (j = 0; j < store->num_extra_frag; j++) | |
1801 | kfree_skb(store->extra_frag[j]); | |
1802 | kfree(store->extra_frag); | |
e2530083 | 1803 | clear_bit(i, local->queues_pending); |
e2ebc74d JB |
1804 | } |
1805 | } | |
1806 | ||
e2530083 JB |
1807 | /* |
1808 | * Transmit all pending packets. Called from tasklet, locks master device | |
1809 | * TX lock so that no new packets can come in. | |
1810 | */ | |
e2ebc74d JB |
1811 | void ieee80211_tx_pending(unsigned long data) |
1812 | { | |
1813 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
1814 | struct net_device *dev = local->mdev; | |
1815 | struct ieee80211_tx_stored_packet *store; | |
5cf121c3 | 1816 | struct ieee80211_tx_data tx; |
e2530083 | 1817 | int i, ret; |
e2ebc74d JB |
1818 | |
1819 | netif_tx_lock_bh(dev); | |
e2530083 JB |
1820 | for (i = 0; i < ieee80211_num_regular_queues(&local->hw); i++) { |
1821 | /* Check that this queue is ok */ | |
f8e79ddd TW |
1822 | if (__netif_subqueue_stopped(local->mdev, i) && |
1823 | !test_bit(i, local->queues_pending_run)) | |
e2ebc74d | 1824 | continue; |
e2530083 JB |
1825 | |
1826 | if (!test_bit(i, local->queues_pending)) { | |
f8e79ddd | 1827 | clear_bit(i, local->queues_pending_run); |
e2530083 | 1828 | ieee80211_wake_queue(&local->hw, i); |
e2ebc74d JB |
1829 | continue; |
1830 | } | |
e2530083 | 1831 | |
f8e79ddd TW |
1832 | clear_bit(i, local->queues_pending_run); |
1833 | netif_start_subqueue(local->mdev, i); | |
1834 | ||
e2ebc74d | 1835 | store = &local->pending_packet[i]; |
5cf121c3 JB |
1836 | tx.extra_frag = store->extra_frag; |
1837 | tx.num_extra_frag = store->num_extra_frag; | |
badffb72 | 1838 | tx.flags = 0; |
e2ebc74d JB |
1839 | ret = __ieee80211_tx(local, store->skb, &tx); |
1840 | if (ret) { | |
1841 | if (ret == IEEE80211_TX_FRAG_AGAIN) | |
1842 | store->skb = NULL; | |
1843 | } else { | |
e2530083 JB |
1844 | clear_bit(i, local->queues_pending); |
1845 | ieee80211_wake_queue(&local->hw, i); | |
e2ebc74d JB |
1846 | } |
1847 | } | |
1848 | netif_tx_unlock_bh(dev); | |
e2ebc74d JB |
1849 | } |
1850 | ||
1851 | /* functions for drivers to get certain frames */ | |
1852 | ||
8e7be8da | 1853 | static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, |
5dfdaf58 JB |
1854 | struct sk_buff *skb, |
1855 | struct beacon_data *beacon) | |
e2ebc74d JB |
1856 | { |
1857 | u8 *pos, *tim; | |
1858 | int aid0 = 0; | |
1859 | int i, have_bits = 0, n1, n2; | |
1860 | ||
1861 | /* Generate bitmap for TIM only if there are any STAs in power save | |
1862 | * mode. */ | |
e2ebc74d JB |
1863 | if (atomic_read(&bss->num_sta_ps) > 0) |
1864 | /* in the hope that this is faster than | |
1865 | * checking byte-for-byte */ | |
1866 | have_bits = !bitmap_empty((unsigned long*)bss->tim, | |
1867 | IEEE80211_MAX_AID+1); | |
1868 | ||
1869 | if (bss->dtim_count == 0) | |
5dfdaf58 | 1870 | bss->dtim_count = beacon->dtim_period - 1; |
e2ebc74d JB |
1871 | else |
1872 | bss->dtim_count--; | |
1873 | ||
1874 | tim = pos = (u8 *) skb_put(skb, 6); | |
1875 | *pos++ = WLAN_EID_TIM; | |
1876 | *pos++ = 4; | |
1877 | *pos++ = bss->dtim_count; | |
5dfdaf58 | 1878 | *pos++ = beacon->dtim_period; |
e2ebc74d JB |
1879 | |
1880 | if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) | |
1881 | aid0 = 1; | |
1882 | ||
1883 | if (have_bits) { | |
1884 | /* Find largest even number N1 so that bits numbered 1 through | |
1885 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
1886 | * (N2 + 1) x 8 through 2007 are 0. */ | |
1887 | n1 = 0; | |
1888 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
1889 | if (bss->tim[i]) { | |
1890 | n1 = i & 0xfe; | |
1891 | break; | |
1892 | } | |
1893 | } | |
1894 | n2 = n1; | |
1895 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
1896 | if (bss->tim[i]) { | |
1897 | n2 = i; | |
1898 | break; | |
1899 | } | |
1900 | } | |
1901 | ||
1902 | /* Bitmap control */ | |
1903 | *pos++ = n1 | aid0; | |
1904 | /* Part Virt Bitmap */ | |
1905 | memcpy(pos, bss->tim + n1, n2 - n1 + 1); | |
1906 | ||
1907 | tim[1] = n2 - n1 + 4; | |
1908 | skb_put(skb, n2 - n1); | |
1909 | } else { | |
1910 | *pos++ = aid0; /* Bitmap control */ | |
1911 | *pos++ = 0; /* Part Virt Bitmap */ | |
1912 | } | |
e2ebc74d JB |
1913 | } |
1914 | ||
32bfd35d | 1915 | struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, |
e039fa4a | 1916 | struct ieee80211_vif *vif) |
e2ebc74d JB |
1917 | { |
1918 | struct ieee80211_local *local = hw_to_local(hw); | |
9d139c81 | 1919 | struct sk_buff *skb = NULL; |
e039fa4a | 1920 | struct ieee80211_tx_info *info; |
e2ebc74d JB |
1921 | struct ieee80211_sub_if_data *sdata = NULL; |
1922 | struct ieee80211_if_ap *ap = NULL; | |
9d139c81 | 1923 | struct ieee80211_if_sta *ifsta = NULL; |
5dfdaf58 | 1924 | struct beacon_data *beacon; |
8318d78a | 1925 | struct ieee80211_supported_band *sband; |
2e92e6f2 | 1926 | enum ieee80211_band band = local->hw.conf.channel->band; |
8318d78a | 1927 | |
2e92e6f2 | 1928 | sband = local->hw.wiphy->bands[band]; |
5dfdaf58 JB |
1929 | |
1930 | rcu_read_lock(); | |
e2ebc74d | 1931 | |
32bfd35d | 1932 | sdata = vif_to_sdata(vif); |
e2ebc74d | 1933 | |
05c914fe | 1934 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
33b64eb2 LCC |
1935 | ap = &sdata->u.ap; |
1936 | beacon = rcu_dereference(ap->beacon); | |
902acc78 JB |
1937 | if (ap && beacon) { |
1938 | /* | |
1939 | * headroom, head length, | |
1940 | * tail length and maximum TIM length | |
1941 | */ | |
1942 | skb = dev_alloc_skb(local->tx_headroom + | |
1943 | beacon->head_len + | |
1944 | beacon->tail_len + 256); | |
1945 | if (!skb) | |
1946 | goto out; | |
33b64eb2 | 1947 | |
902acc78 JB |
1948 | skb_reserve(skb, local->tx_headroom); |
1949 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
1950 | beacon->head_len); | |
33b64eb2 | 1951 | |
d0709a65 JB |
1952 | /* |
1953 | * Not very nice, but we want to allow the driver to call | |
1954 | * ieee80211_beacon_get() as a response to the set_tim() | |
1955 | * callback. That, however, is already invoked under the | |
1956 | * sta_lock to guarantee consistent and race-free update | |
1957 | * of the tim bitmap in mac80211 and the driver. | |
1958 | */ | |
1959 | if (local->tim_in_locked_section) { | |
8e7be8da | 1960 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
1961 | } else { |
1962 | unsigned long flags; | |
1963 | ||
1964 | spin_lock_irqsave(&local->sta_lock, flags); | |
8e7be8da | 1965 | ieee80211_beacon_add_tim(ap, skb, beacon); |
d0709a65 JB |
1966 | spin_unlock_irqrestore(&local->sta_lock, flags); |
1967 | } | |
33b64eb2 | 1968 | |
902acc78 JB |
1969 | if (beacon->tail) |
1970 | memcpy(skb_put(skb, beacon->tail_len), | |
1971 | beacon->tail, beacon->tail_len); | |
9d139c81 JB |
1972 | } else |
1973 | goto out; | |
05c914fe | 1974 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
9d139c81 JB |
1975 | struct ieee80211_hdr *hdr; |
1976 | ifsta = &sdata->u.sta; | |
33b64eb2 | 1977 | |
9d139c81 JB |
1978 | if (!ifsta->probe_resp) |
1979 | goto out; | |
1980 | ||
1981 | skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC); | |
1982 | if (!skb) | |
1983 | goto out; | |
1984 | ||
1985 | hdr = (struct ieee80211_hdr *) skb->data; | |
e7827a70 HH |
1986 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1987 | IEEE80211_STYPE_BEACON); | |
9d139c81 | 1988 | |
902acc78 | 1989 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472dbc45 JB |
1990 | struct ieee80211_mgmt *mgmt; |
1991 | u8 *pos; | |
1992 | ||
902acc78 JB |
1993 | /* headroom, head length, tail length and maximum TIM length */ |
1994 | skb = dev_alloc_skb(local->tx_headroom + 400); | |
1995 | if (!skb) | |
1996 | goto out; | |
1997 | ||
1998 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1999 | mgmt = (struct ieee80211_mgmt *) | |
2000 | skb_put(skb, 24 + sizeof(mgmt->u.beacon)); | |
2001 | memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); | |
065e9605 HH |
2002 | mgmt->frame_control = |
2003 | cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); | |
902acc78 JB |
2004 | memset(mgmt->da, 0xff, ETH_ALEN); |
2005 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
2006 | /* BSSID is left zeroed, wildcard value */ | |
2007 | mgmt->u.beacon.beacon_int = | |
2008 | cpu_to_le16(local->hw.conf.beacon_int); | |
2009 | mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ | |
2010 | ||
2011 | pos = skb_put(skb, 2); | |
2012 | *pos++ = WLAN_EID_SSID; | |
2013 | *pos++ = 0x0; | |
2014 | ||
f698d856 | 2015 | mesh_mgmt_ies_add(skb, sdata); |
9d139c81 JB |
2016 | } else { |
2017 | WARN_ON(1); | |
5dfdaf58 | 2018 | goto out; |
e2ebc74d JB |
2019 | } |
2020 | ||
e039fa4a JB |
2021 | info = IEEE80211_SKB_CB(skb); |
2022 | ||
d0f09804 JB |
2023 | skb->do_not_encrypt = 1; |
2024 | ||
e039fa4a | 2025 | info->band = band; |
e6a9854b JB |
2026 | /* |
2027 | * XXX: For now, always use the lowest rate | |
2028 | */ | |
2029 | info->control.rates[0].idx = 0; | |
2030 | info->control.rates[0].count = 1; | |
2031 | info->control.rates[1].idx = -1; | |
2032 | info->control.rates[2].idx = -1; | |
2033 | info->control.rates[3].idx = -1; | |
2034 | info->control.rates[4].idx = -1; | |
2035 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); | |
e039fa4a JB |
2036 | |
2037 | info->control.vif = vif; | |
f591fa5d JB |
2038 | |
2039 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
f591fa5d JB |
2040 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
2041 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
e6a9854b | 2042 | out: |
5dfdaf58 | 2043 | rcu_read_unlock(); |
e2ebc74d JB |
2044 | return skb; |
2045 | } | |
2046 | EXPORT_SYMBOL(ieee80211_beacon_get); | |
2047 | ||
32bfd35d | 2048 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2049 | const void *frame, size_t frame_len, |
e039fa4a | 2050 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2051 | struct ieee80211_rts *rts) |
2052 | { | |
2053 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2054 | |
065e9605 HH |
2055 | rts->frame_control = |
2056 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
32bfd35d JB |
2057 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2058 | frame_txctl); | |
e2ebc74d JB |
2059 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2060 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2061 | } | |
2062 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2063 | ||
32bfd35d | 2064 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
e2ebc74d | 2065 | const void *frame, size_t frame_len, |
e039fa4a | 2066 | const struct ieee80211_tx_info *frame_txctl, |
e2ebc74d JB |
2067 | struct ieee80211_cts *cts) |
2068 | { | |
2069 | const struct ieee80211_hdr *hdr = frame; | |
e2ebc74d | 2070 | |
065e9605 HH |
2071 | cts->frame_control = |
2072 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
32bfd35d JB |
2073 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2074 | frame_len, frame_txctl); | |
e2ebc74d JB |
2075 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2076 | } | |
2077 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2078 | ||
2079 | struct sk_buff * | |
32bfd35d | 2080 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
e039fa4a | 2081 | struct ieee80211_vif *vif) |
e2ebc74d JB |
2082 | { |
2083 | struct ieee80211_local *local = hw_to_local(hw); | |
747cf5e9 | 2084 | struct sk_buff *skb = NULL; |
e2ebc74d | 2085 | struct sta_info *sta; |
5cf121c3 | 2086 | struct ieee80211_tx_data tx; |
e2ebc74d JB |
2087 | struct ieee80211_sub_if_data *sdata; |
2088 | struct ieee80211_if_ap *bss = NULL; | |
5dfdaf58 | 2089 | struct beacon_data *beacon; |
e039fa4a | 2090 | struct ieee80211_tx_info *info; |
e2ebc74d | 2091 | |
32bfd35d | 2092 | sdata = vif_to_sdata(vif); |
747cf5e9 | 2093 | bss = &sdata->u.ap; |
5dfdaf58 JB |
2094 | |
2095 | if (!bss) | |
e2ebc74d JB |
2096 | return NULL; |
2097 | ||
5dfdaf58 JB |
2098 | rcu_read_lock(); |
2099 | beacon = rcu_dereference(bss->beacon); | |
2100 | ||
05c914fe | 2101 | if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) |
747cf5e9 | 2102 | goto out; |
5dfdaf58 | 2103 | |
e2ebc74d | 2104 | if (bss->dtim_count != 0) |
747cf5e9 | 2105 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
e039fa4a | 2106 | |
e2ebc74d JB |
2107 | while (1) { |
2108 | skb = skb_dequeue(&bss->ps_bc_buf); | |
2109 | if (!skb) | |
747cf5e9 | 2110 | goto out; |
e2ebc74d JB |
2111 | local->total_ps_buffered--; |
2112 | ||
2113 | if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { | |
2114 | struct ieee80211_hdr *hdr = | |
2115 | (struct ieee80211_hdr *) skb->data; | |
2116 | /* more buffered multicast/broadcast frames ==> set | |
2117 | * MoreData flag in IEEE 802.11 header to inform PS | |
2118 | * STAs */ | |
2119 | hdr->frame_control |= | |
2120 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2121 | } | |
2122 | ||
133b8226 | 2123 | if (!ieee80211_tx_prepare(local, &tx, skb)) |
e2ebc74d JB |
2124 | break; |
2125 | dev_kfree_skb_any(skb); | |
2126 | } | |
e039fa4a JB |
2127 | |
2128 | info = IEEE80211_SKB_CB(skb); | |
2129 | ||
e2ebc74d | 2130 | sta = tx.sta; |
5cf121c3 JB |
2131 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2132 | tx.channel = local->hw.conf.channel; | |
e039fa4a | 2133 | info->band = tx.channel->band; |
e2ebc74d | 2134 | |
97b045d6 | 2135 | if (invoke_tx_handlers(&tx)) |
e2ebc74d | 2136 | skb = NULL; |
97b045d6 | 2137 | out: |
d0709a65 | 2138 | rcu_read_unlock(); |
e2ebc74d JB |
2139 | |
2140 | return skb; | |
2141 | } | |
2142 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |