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Commit | Line | Data |
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571ecf67 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 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
c6a1fa12 JB |
30 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
31 | struct tid_ampdu_rx *tid_agg_rx, | |
32 | struct sk_buff *skb, | |
33 | u16 mpdu_seq_num, | |
34 | int bar_req); | |
b2e7771e JB |
35 | /* |
36 | * monitor mode reception | |
37 | * | |
38 | * This function cleans up the SKB, i.e. it removes all the stuff | |
39 | * only useful for monitoring. | |
40 | */ | |
41 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
42 | struct sk_buff *skb, | |
43 | int rtap_len) | |
44 | { | |
45 | skb_pull(skb, rtap_len); | |
46 | ||
47 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
48 | if (likely(skb->len > FCS_LEN)) | |
49 | skb_trim(skb, skb->len - FCS_LEN); | |
50 | else { | |
51 | /* driver bug */ | |
52 | WARN_ON(1); | |
53 | dev_kfree_skb(skb); | |
54 | skb = NULL; | |
55 | } | |
56 | } | |
57 | ||
58 | return skb; | |
59 | } | |
60 | ||
f1d58c25 | 61 | static inline int should_drop_frame(struct sk_buff *skb, |
b2e7771e JB |
62 | int present_fcs_len, |
63 | int radiotap_len) | |
64 | { | |
f1d58c25 | 65 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 66 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
67 | |
68 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
69 | return 1; | |
70 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
71 | return 1; | |
87228f57 HH |
72 | if (ieee80211_is_ctl(hdr->frame_control) && |
73 | !ieee80211_is_pspoll(hdr->frame_control) && | |
74 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
75 | return 1; |
76 | return 0; | |
77 | } | |
78 | ||
601ae7f2 BR |
79 | static int |
80 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
81 | struct ieee80211_rx_status *status) | |
82 | { | |
83 | int len; | |
84 | ||
85 | /* always present fields */ | |
86 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
87 | ||
88 | if (status->flag & RX_FLAG_TSFT) | |
89 | len += 8; | |
7fee5372 | 90 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
91 | len += 1; |
92 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
93 | len += 1; | |
94 | ||
95 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
96 | len++; | |
97 | ||
98 | /* make sure radiotap starts at a naturally aligned address */ | |
99 | if (len % 8) | |
100 | len = roundup(len, 8); | |
101 | ||
102 | return len; | |
103 | } | |
104 | ||
d1c3a37c | 105 | /* |
601ae7f2 BR |
106 | * ieee80211_add_rx_radiotap_header - add radiotap header |
107 | * | |
108 | * add a radiotap header containing all the fields which the hardware provided. | |
109 | */ | |
110 | static void | |
111 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
112 | struct sk_buff *skb, | |
601ae7f2 BR |
113 | struct ieee80211_rate *rate, |
114 | int rtap_len) | |
115 | { | |
f1d58c25 | 116 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
117 | struct ieee80211_radiotap_header *rthdr; |
118 | unsigned char *pos; | |
119 | ||
120 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
121 | memset(rthdr, 0, rtap_len); | |
122 | ||
123 | /* radiotap header, set always present flags */ | |
124 | rthdr->it_present = | |
125 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
126 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
127 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
128 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
129 | rthdr->it_len = cpu_to_le16(rtap_len); | |
130 | ||
131 | pos = (unsigned char *)(rthdr+1); | |
132 | ||
133 | /* the order of the following fields is important */ | |
134 | ||
135 | /* IEEE80211_RADIOTAP_TSFT */ | |
136 | if (status->flag & RX_FLAG_TSFT) { | |
137 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
138 | rthdr->it_present |= | |
139 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
140 | pos += 8; | |
141 | } | |
142 | ||
143 | /* IEEE80211_RADIOTAP_FLAGS */ | |
144 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
145 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
146 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
147 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
148 | if (status->flag & RX_FLAG_SHORTPRE) |
149 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
150 | pos++; |
151 | ||
152 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
153 | if (status->flag & RX_FLAG_HT) { |
154 | /* | |
155 | * TODO: add following information into radiotap header once | |
156 | * suitable fields are defined for it: | |
157 | * - MCS index (status->rate_idx) | |
158 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
159 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
160 | */ | |
161 | *pos = 0; | |
8d6f658e | 162 | } else { |
ebe6c7ba | 163 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 164 | *pos = rate->bitrate / 5; |
8d6f658e | 165 | } |
601ae7f2 BR |
166 | pos++; |
167 | ||
168 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
169 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
170 | pos += 2; | |
171 | if (status->band == IEEE80211_BAND_5GHZ) | |
172 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
173 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
174 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
175 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
176 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 177 | else |
9deb1ae5 | 178 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
179 | IEEE80211_CHAN_2GHZ); |
180 | pos += 2; | |
181 | ||
182 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
183 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
184 | *pos = status->signal; | |
185 | rthdr->it_present |= | |
186 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
187 | pos++; | |
188 | } | |
189 | ||
190 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
191 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
192 | *pos = status->noise; | |
193 | rthdr->it_present |= | |
194 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
195 | pos++; | |
196 | } | |
197 | ||
198 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
199 | ||
200 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
201 | *pos = status->antenna; | |
202 | pos++; | |
203 | ||
601ae7f2 BR |
204 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
205 | ||
206 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
207 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
208 | if ((pos - (unsigned char *)rthdr) & 1) | |
209 | pos++; | |
aae89831 JB |
210 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
211 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP); | |
601ae7f2 BR |
212 | pos += 2; |
213 | } | |
214 | ||
b2e7771e JB |
215 | /* |
216 | * This function copies a received frame to all monitor interfaces and | |
217 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
218 | * radiotap header the driver might have added. | |
219 | */ | |
220 | static struct sk_buff * | |
221 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 222 | struct ieee80211_rate *rate) |
b2e7771e | 223 | { |
f1d58c25 | 224 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 225 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 226 | int needed_headroom = 0; |
b2e7771e JB |
227 | struct sk_buff *skb, *skb2; |
228 | struct net_device *prev_dev = NULL; | |
229 | int present_fcs_len = 0; | |
230 | int rtap_len = 0; | |
231 | ||
232 | /* | |
233 | * First, we may need to make a copy of the skb because | |
234 | * (1) we need to modify it for radiotap (if not present), and | |
235 | * (2) the other RX handlers will modify the skb we got. | |
236 | * | |
237 | * We don't need to, of course, if we aren't going to return | |
238 | * the SKB because it has a bad FCS/PLCP checksum. | |
239 | */ | |
240 | if (status->flag & RX_FLAG_RADIOTAP) | |
241 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
242 | else | |
601ae7f2 BR |
243 | /* room for the radiotap header based on driver features */ |
244 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
245 | |
246 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
247 | present_fcs_len = FCS_LEN; | |
248 | ||
249 | if (!local->monitors) { | |
f1d58c25 | 250 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
b2e7771e JB |
251 | dev_kfree_skb(origskb); |
252 | return NULL; | |
253 | } | |
254 | ||
255 | return remove_monitor_info(local, origskb, rtap_len); | |
256 | } | |
257 | ||
f1d58c25 | 258 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
b2e7771e JB |
259 | /* only need to expand headroom if necessary */ |
260 | skb = origskb; | |
261 | origskb = NULL; | |
262 | ||
263 | /* | |
264 | * This shouldn't trigger often because most devices have an | |
265 | * RX header they pull before we get here, and that should | |
266 | * be big enough for our radiotap information. We should | |
267 | * probably export the length to drivers so that we can have | |
268 | * them allocate enough headroom to start with. | |
269 | */ | |
270 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 271 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
272 | dev_kfree_skb(skb); |
273 | return NULL; | |
274 | } | |
275 | } else { | |
276 | /* | |
277 | * Need to make a copy and possibly remove radiotap header | |
278 | * and FCS from the original. | |
279 | */ | |
280 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
281 | ||
282 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
283 | ||
284 | if (!skb) | |
285 | return origskb; | |
286 | } | |
287 | ||
288 | /* if necessary, prepend radiotap information */ | |
601ae7f2 | 289 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
f1d58c25 | 290 | ieee80211_add_rx_radiotap_header(local, skb, rate, |
601ae7f2 | 291 | needed_headroom); |
b2e7771e | 292 | |
ce3edf6d | 293 | skb_reset_mac_header(skb); |
b2e7771e JB |
294 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
295 | skb->pkt_type = PACKET_OTHERHOST; | |
296 | skb->protocol = htons(ETH_P_802_2); | |
297 | ||
298 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
299 | if (!netif_running(sdata->dev)) | |
300 | continue; | |
301 | ||
05c914fe | 302 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
303 | continue; |
304 | ||
3d30d949 MW |
305 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
306 | continue; | |
307 | ||
b2e7771e JB |
308 | if (prev_dev) { |
309 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
310 | if (skb2) { | |
311 | skb2->dev = prev_dev; | |
312 | netif_rx(skb2); | |
313 | } | |
314 | } | |
315 | ||
316 | prev_dev = sdata->dev; | |
317 | sdata->dev->stats.rx_packets++; | |
318 | sdata->dev->stats.rx_bytes += skb->len; | |
319 | } | |
320 | ||
321 | if (prev_dev) { | |
322 | skb->dev = prev_dev; | |
323 | netif_rx(skb); | |
324 | } else | |
325 | dev_kfree_skb(skb); | |
326 | ||
327 | return origskb; | |
328 | } | |
329 | ||
330 | ||
5cf121c3 | 331 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 332 | { |
238f74a2 | 333 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
334 | int tid; |
335 | ||
336 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
337 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
338 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 339 | /* frame has qos control */ |
238f74a2 HH |
340 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
341 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 342 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 343 | else |
5cf121c3 | 344 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 345 | } else { |
1411f9b5 JB |
346 | /* |
347 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
348 | * | |
349 | * Sequence numbers for management frames, QoS data | |
350 | * frames with a broadcast/multicast address in the | |
351 | * Address 1 field, and all non-QoS data frames sent | |
352 | * by QoS STAs are assigned using an additional single | |
353 | * modulo-4096 counter, [...] | |
354 | * | |
355 | * We also use that counter for non-QoS STAs. | |
356 | */ | |
357 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 358 | } |
52865dfd | 359 | |
5cf121c3 | 360 | rx->queue = tid; |
6e0d114d JB |
361 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
362 | * For now, set skb->priority to 0 for other cases. */ | |
363 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 364 | } |
6e0d114d | 365 | |
d1c3a37c JB |
366 | /** |
367 | * DOC: Packet alignment | |
368 | * | |
369 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
370 | * to the stack. | |
371 | * | |
372 | * Additionally, should, if possible, align the payload data in a way that | |
373 | * guarantees that the contained IP header is aligned to a four-byte | |
374 | * boundary. In the case of regular frames, this simply means aligning the | |
375 | * payload to a four-byte boundary (because either the IP header is directly | |
376 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
377 | * in front of it). | |
378 | * | |
379 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
380 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
381 | * push the IP header further back to a multiple of four again. Thankfully, the | |
382 | * specs were sane enough this time around to require padding each A-MSDU | |
383 | * subframe to a length that is a multiple of four. | |
384 | * | |
385 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
386 | * the payload is not supported, the driver is required to move the 802.11 | |
387 | * header to be directly in front of the payload in that case. | |
388 | */ | |
389 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 390 | { |
a7767f95 | 391 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
392 | int hdrlen; |
393 | ||
d1c3a37c JB |
394 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
395 | return; | |
396 | #endif | |
397 | ||
398 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
399 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
400 | return; | |
401 | ||
a7767f95 | 402 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
403 | return; |
404 | ||
a7767f95 | 405 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 406 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 407 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
408 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
409 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
410 | } |
411 | ||
6368e4b1 | 412 | |
571ecf67 JB |
413 | /* rx handlers */ |
414 | ||
49461622 | 415 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 416 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
417 | { |
418 | struct ieee80211_local *local = rx->local; | |
419 | struct sk_buff *skb = rx->skb; | |
420 | ||
c2b13452 | 421 | if (unlikely(local->hw_scanning)) |
f1d58c25 | 422 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 423 | |
c2b13452 | 424 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 425 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 426 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 427 | dev_kfree_skb(skb); |
9ae54c84 | 428 | return RX_QUEUED; |
571ecf67 JB |
429 | } |
430 | ||
5cf121c3 | 431 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
432 | /* scanning finished during invoking of handlers */ |
433 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 434 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
435 | } |
436 | ||
9ae54c84 | 437 | return RX_CONTINUE; |
571ecf67 JB |
438 | } |
439 | ||
3cfcf6ac JM |
440 | |
441 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
442 | { | |
443 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
444 | ||
445 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
446 | return 0; | |
447 | ||
448 | return ieee80211_is_robust_mgmt_frame(hdr); | |
449 | } | |
450 | ||
451 | ||
452 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
453 | { | |
454 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
455 | ||
456 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
457 | return 0; | |
458 | ||
459 | return ieee80211_is_robust_mgmt_frame(hdr); | |
460 | } | |
461 | ||
462 | ||
463 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
464 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
465 | { | |
466 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
467 | struct ieee80211_mmie *mmie; | |
468 | ||
469 | if (skb->len < 24 + sizeof(*mmie) || | |
470 | !is_multicast_ether_addr(hdr->da)) | |
471 | return -1; | |
472 | ||
473 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
474 | return -1; /* not a robust management frame */ | |
475 | ||
476 | mmie = (struct ieee80211_mmie *) | |
477 | (skb->data + skb->len - sizeof(*mmie)); | |
478 | if (mmie->element_id != WLAN_EID_MMIE || | |
479 | mmie->length != sizeof(*mmie) - 2) | |
480 | return -1; | |
481 | ||
482 | return le16_to_cpu(mmie->key_id); | |
483 | } | |
484 | ||
485 | ||
33b64eb2 | 486 | static ieee80211_rx_result |
5cf121c3 | 487 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 488 | { |
a7767f95 HH |
489 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
490 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 491 | |
a7767f95 HH |
492 | if (ieee80211_is_data(hdr->frame_control)) { |
493 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
494 | return RX_DROP_MONITOR; |
495 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
496 | return RX_DROP_MONITOR; | |
497 | } | |
498 | ||
499 | /* If there is not an established peer link and this is not a peer link | |
500 | * establisment frame, beacon or probe, drop the frame. | |
501 | */ | |
502 | ||
b4e08ea1 | 503 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 504 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 505 | |
a7767f95 | 506 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
507 | return RX_DROP_MONITOR; |
508 | ||
a7767f95 | 509 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
510 | mgmt = (struct ieee80211_mgmt *)hdr; |
511 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
512 | return RX_DROP_MONITOR; | |
33b64eb2 | 513 | return RX_CONTINUE; |
33b64eb2 LCC |
514 | } |
515 | ||
a7767f95 HH |
516 | if (ieee80211_is_probe_req(hdr->frame_control) || |
517 | ieee80211_is_probe_resp(hdr->frame_control) || | |
518 | ieee80211_is_beacon(hdr->frame_control)) | |
519 | return RX_CONTINUE; | |
520 | ||
521 | return RX_DROP_MONITOR; | |
522 | ||
523 | } | |
524 | ||
525 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
526 | ||
527 | if (ieee80211_is_data(hdr->frame_control) && | |
528 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 529 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 530 | return RX_DROP_MONITOR; |
902acc78 | 531 | #undef msh_h_get |
d6d1a5a7 | 532 | |
902acc78 JB |
533 | return RX_CONTINUE; |
534 | } | |
33b64eb2 LCC |
535 | |
536 | ||
49461622 | 537 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 538 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 539 | { |
a7767f95 | 540 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
541 | |
542 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
543 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 544 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 545 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 546 | hdr->seq_ctrl)) { |
5cf121c3 | 547 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
548 | rx->local->dot11FrameDuplicateCount++; |
549 | rx->sta->num_duplicates++; | |
550 | } | |
e4c26add | 551 | return RX_DROP_MONITOR; |
571ecf67 | 552 | } else |
5cf121c3 | 553 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
554 | } |
555 | ||
571ecf67 JB |
556 | if (unlikely(rx->skb->len < 16)) { |
557 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 558 | return RX_DROP_MONITOR; |
571ecf67 JB |
559 | } |
560 | ||
571ecf67 JB |
561 | /* Drop disallowed frame classes based on STA auth/assoc state; |
562 | * IEEE 802.11, Chap 5.5. | |
563 | * | |
ccd7b362 JB |
564 | * mac80211 filters only based on association state, i.e. it drops |
565 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
566 | * deauth/disassoc frames when needed. In addition, hostapd is |
567 | * responsible for filtering on both auth and assoc states. | |
568 | */ | |
33b64eb2 | 569 | |
902acc78 | 570 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 571 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 572 | |
a7767f95 HH |
573 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
574 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 575 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 576 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
577 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
578 | !ieee80211_has_tods(hdr->frame_control) && | |
579 | ieee80211_is_data(hdr->frame_control)) || | |
580 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
581 | /* Drop IBSS frames and frames for other hosts |
582 | * silently. */ | |
e4c26add | 583 | return RX_DROP_MONITOR; |
571ecf67 JB |
584 | } |
585 | ||
e4c26add | 586 | return RX_DROP_MONITOR; |
571ecf67 JB |
587 | } |
588 | ||
9ae54c84 | 589 | return RX_CONTINUE; |
570bd537 JB |
590 | } |
591 | ||
592 | ||
49461622 | 593 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 594 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 595 | { |
a7767f95 | 596 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
597 | int keyidx; |
598 | int hdrlen; | |
e4c26add | 599 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 600 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 601 | int mmie_keyidx = -1; |
570bd537 | 602 | |
3017b80b JB |
603 | /* |
604 | * Key selection 101 | |
605 | * | |
3cfcf6ac | 606 | * There are four types of keys: |
3017b80b | 607 | * - GTK (group keys) |
3cfcf6ac | 608 | * - IGTK (group keys for management frames) |
3017b80b JB |
609 | * - PTK (pairwise keys) |
610 | * - STK (station-to-station pairwise keys) | |
611 | * | |
612 | * When selecting a key, we have to distinguish between multicast | |
613 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
614 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
615 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
616 | * unicast frames can also use key indices like GTKs. Hence, if we | |
617 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 618 | * |
8dc06a1c JB |
619 | * Note that in a regular BSS, multicast frames are sent by the |
620 | * AP only, associated stations unicast the frame to the AP first | |
621 | * which then multicasts it on their behalf. | |
622 | * | |
3017b80b JB |
623 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
624 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
625 | * The spec seems to expect that one negotiates the same key with |
626 | * every station but there's no such requirement; VLANs could be | |
627 | * possible. | |
3017b80b JB |
628 | */ |
629 | ||
3017b80b | 630 | /* |
1990af8d | 631 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
632 | * addressed to us nor a multicast frame. |
633 | */ | |
5cf121c3 | 634 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 635 | return RX_CONTINUE; |
3017b80b | 636 | |
d4e46a3d JB |
637 | if (rx->sta) |
638 | stakey = rcu_dereference(rx->sta->key); | |
639 | ||
0c7c10c7 JM |
640 | if (!ieee80211_has_protected(hdr->frame_control)) |
641 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
642 | ||
d4e46a3d JB |
643 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
644 | rx->key = stakey; | |
0c7c10c7 JM |
645 | /* Skip decryption if the frame is not protected. */ |
646 | if (!ieee80211_has_protected(hdr->frame_control)) | |
647 | return RX_CONTINUE; | |
3cfcf6ac JM |
648 | } else if (mmie_keyidx >= 0) { |
649 | /* Broadcast/multicast robust management frame / BIP */ | |
650 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && | |
651 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
652 | return RX_CONTINUE; | |
653 | ||
654 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
655 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
656 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
657 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
658 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
659 | /* | |
660 | * The frame was not protected, so skip decryption. However, we | |
661 | * need to set rx->key if there is a key that could have been | |
662 | * used so that the frame may be dropped if encryption would | |
663 | * have been expected. | |
664 | */ | |
665 | struct ieee80211_key *key = NULL; | |
666 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
667 | is_multicast_ether_addr(hdr->addr1) && | |
668 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
669 | rx->key = key; | |
670 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
671 | rx->key = key; | |
672 | return RX_CONTINUE; | |
571ecf67 | 673 | } else { |
3017b80b JB |
674 | /* |
675 | * The device doesn't give us the IV so we won't be | |
676 | * able to look up the key. That's ok though, we | |
677 | * don't need to decrypt the frame, we just won't | |
678 | * be able to keep statistics accurate. | |
679 | * Except for key threshold notifications, should | |
680 | * we somehow allow the driver to tell us which key | |
681 | * the hardware used if this flag is set? | |
682 | */ | |
5cf121c3 JB |
683 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
684 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 685 | return RX_CONTINUE; |
3017b80b | 686 | |
a7767f95 | 687 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
688 | |
689 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 690 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
691 | |
692 | /* | |
693 | * no need to call ieee80211_wep_get_keyidx, | |
694 | * it verifies a bunch of things we've done already | |
695 | */ | |
696 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
697 | ||
d4e46a3d | 698 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
699 | |
700 | /* | |
701 | * RSNA-protected unicast frames should always be sent with | |
702 | * pairwise or station-to-station keys, but for WEP we allow | |
703 | * using a key index as well. | |
704 | */ | |
8f20fc24 | 705 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
706 | !is_multicast_ether_addr(hdr->addr1)) |
707 | rx->key = NULL; | |
571ecf67 JB |
708 | } |
709 | ||
3017b80b | 710 | if (rx->key) { |
571ecf67 | 711 | rx->key->tx_rx_count++; |
011bfcc4 | 712 | /* TODO: add threshold stuff again */ |
1990af8d | 713 | } else { |
e4c26add | 714 | return RX_DROP_MONITOR; |
70f08765 JB |
715 | } |
716 | ||
1990af8d JB |
717 | /* Check for weak IVs if possible */ |
718 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 719 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
720 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
721 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
722 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
723 | rx->sta->wep_weak_iv_count++; | |
724 | ||
70f08765 JB |
725 | switch (rx->key->conf.alg) { |
726 | case ALG_WEP: | |
e2f036da MN |
727 | result = ieee80211_crypto_wep_decrypt(rx); |
728 | break; | |
70f08765 | 729 | case ALG_TKIP: |
e2f036da MN |
730 | result = ieee80211_crypto_tkip_decrypt(rx); |
731 | break; | |
70f08765 | 732 | case ALG_CCMP: |
e2f036da MN |
733 | result = ieee80211_crypto_ccmp_decrypt(rx); |
734 | break; | |
3cfcf6ac JM |
735 | case ALG_AES_CMAC: |
736 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
737 | break; | |
70f08765 JB |
738 | } |
739 | ||
e2f036da | 740 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 741 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
742 | |
743 | return result; | |
70f08765 JB |
744 | } |
745 | ||
572e0012 KV |
746 | static ieee80211_rx_result debug_noinline |
747 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
748 | { | |
749 | struct ieee80211_local *local; | |
750 | struct ieee80211_hdr *hdr; | |
751 | struct sk_buff *skb; | |
752 | ||
753 | local = rx->local; | |
754 | skb = rx->skb; | |
755 | hdr = (struct ieee80211_hdr *) skb->data; | |
756 | ||
757 | if (!local->pspolling) | |
758 | return RX_CONTINUE; | |
759 | ||
760 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
761 | /* this is not from AP */ | |
762 | return RX_CONTINUE; | |
763 | ||
764 | if (!ieee80211_is_data(hdr->frame_control)) | |
765 | return RX_CONTINUE; | |
766 | ||
767 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
768 | /* AP has no more frames buffered for us */ | |
769 | local->pspolling = false; | |
770 | return RX_CONTINUE; | |
771 | } | |
772 | ||
773 | /* more data bit is set, let's request a new frame from the AP */ | |
774 | ieee80211_send_pspoll(local, rx->sdata); | |
775 | ||
776 | return RX_CONTINUE; | |
777 | } | |
778 | ||
133b8226 | 779 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 780 | { |
133b8226 | 781 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 782 | struct ieee80211_local *local = sdata->local; |
0795af57 | 783 | |
3e122be0 | 784 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 785 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
24487981 | 786 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 787 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
788 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
789 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
790 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
791 | } | |
792 | ||
133b8226 | 793 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 794 | { |
133b8226 JB |
795 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
796 | struct ieee80211_local *local = sdata->local; | |
8f77f384 | 797 | int sent, buffered; |
571ecf67 | 798 | |
3e122be0 | 799 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 800 | |
07346f81 | 801 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
24487981 | 802 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta); |
004c872e JB |
803 | |
804 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
805 | sta_info_clear_tim_bit(sta); | |
806 | ||
571ecf67 | 807 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
808 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
809 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 810 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 811 | |
571ecf67 | 812 | /* Send all buffered frames to the station */ |
8f77f384 JB |
813 | sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); |
814 | buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); | |
815 | sent += buffered; | |
816 | local->total_ps_buffered -= buffered; | |
817 | ||
571ecf67 | 818 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
8f77f384 JB |
819 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " |
820 | "since STA not sleeping anymore\n", sdata->dev->name, | |
821 | sta->sta.addr, sta->sta.aid, sent - buffered, buffered); | |
571ecf67 | 822 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
823 | |
824 | return sent; | |
825 | } | |
826 | ||
49461622 | 827 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 828 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
829 | { |
830 | struct sta_info *sta = rx->sta; | |
a7767f95 | 831 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
832 | |
833 | if (!sta) | |
9ae54c84 | 834 | return RX_CONTINUE; |
571ecf67 | 835 | |
b291ba11 JB |
836 | /* |
837 | * Update last_rx only for IBSS packets which are for the current | |
838 | * BSSID to avoid keeping the current IBSS network alive in cases | |
839 | * where other STAs start using different BSSID. | |
840 | */ | |
05c914fe | 841 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 842 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 843 | NL80211_IFTYPE_ADHOC); |
46900298 | 844 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 845 | sta->last_rx = jiffies; |
b291ba11 JB |
846 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
847 | /* | |
33b64eb2 LCC |
848 | * Mesh beacons will update last_rx when if they are found to |
849 | * match the current local configuration when processed. | |
571ecf67 | 850 | */ |
b291ba11 | 851 | sta->last_rx = jiffies; |
571ecf67 JB |
852 | } |
853 | ||
5cf121c3 | 854 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 855 | return RX_CONTINUE; |
571ecf67 | 856 | |
3cf335d5 KV |
857 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
858 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
859 | ||
571ecf67 JB |
860 | sta->rx_fragments++; |
861 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 862 | sta->last_signal = rx->status->signal; |
566bfe5a | 863 | sta->last_qual = rx->status->qual; |
5cf121c3 | 864 | sta->last_noise = rx->status->noise; |
571ecf67 | 865 | |
72eaa43a JB |
866 | /* |
867 | * Change STA power saving mode only at the end of a frame | |
868 | * exchange sequence. | |
869 | */ | |
3e122be0 | 870 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
871 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
872 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
873 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
874 | /* | |
875 | * Ignore doze->wake transitions that are | |
876 | * indicated by non-data frames, the standard | |
877 | * is unclear here, but for example going to | |
878 | * PS mode and then scanning would cause a | |
879 | * doze->wake transition for the probe request, | |
880 | * and that is clearly undesirable. | |
881 | */ | |
882 | if (ieee80211_is_data(hdr->frame_control) && | |
883 | !ieee80211_has_pm(hdr->frame_control)) | |
884 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
885 | } else { | |
886 | if (ieee80211_has_pm(hdr->frame_control)) | |
887 | ap_sta_ps_start(sta); | |
888 | } | |
571ecf67 JB |
889 | } |
890 | ||
891 | /* Drop data::nullfunc frames silently, since they are used only to | |
892 | * control station power saving mode. */ | |
a7767f95 | 893 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
894 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
895 | /* Update counter and free packet here to avoid counting this | |
896 | * as a dropped packed. */ | |
897 | sta->rx_packets++; | |
898 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 899 | return RX_QUEUED; |
571ecf67 JB |
900 | } |
901 | ||
9ae54c84 | 902 | return RX_CONTINUE; |
571ecf67 JB |
903 | } /* ieee80211_rx_h_sta_process */ |
904 | ||
571ecf67 JB |
905 | static inline struct ieee80211_fragment_entry * |
906 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
907 | unsigned int frag, unsigned int seq, int rx_queue, | |
908 | struct sk_buff **skb) | |
909 | { | |
910 | struct ieee80211_fragment_entry *entry; | |
911 | int idx; | |
912 | ||
913 | idx = sdata->fragment_next; | |
914 | entry = &sdata->fragments[sdata->fragment_next++]; | |
915 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
916 | sdata->fragment_next = 0; | |
917 | ||
918 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 919 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
920 | struct ieee80211_hdr *hdr = |
921 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
922 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
923 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 924 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
925 | sdata->dev->name, idx, |
926 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 927 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 928 | #endif |
571ecf67 JB |
929 | __skb_queue_purge(&entry->skb_list); |
930 | } | |
931 | ||
932 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
933 | *skb = NULL; | |
934 | entry->first_frag_time = jiffies; | |
935 | entry->seq = seq; | |
936 | entry->rx_queue = rx_queue; | |
937 | entry->last_frag = frag; | |
938 | entry->ccmp = 0; | |
939 | entry->extra_len = 0; | |
940 | ||
941 | return entry; | |
942 | } | |
943 | ||
944 | static inline struct ieee80211_fragment_entry * | |
945 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 946 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
947 | int rx_queue, struct ieee80211_hdr *hdr) |
948 | { | |
949 | struct ieee80211_fragment_entry *entry; | |
950 | int i, idx; | |
951 | ||
952 | idx = sdata->fragment_next; | |
953 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
954 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
955 | |
956 | idx--; | |
957 | if (idx < 0) | |
958 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
959 | ||
960 | entry = &sdata->fragments[idx]; | |
961 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
962 | entry->rx_queue != rx_queue || | |
963 | entry->last_frag + 1 != frag) | |
964 | continue; | |
965 | ||
b73d70ad | 966 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 967 | |
b73d70ad HH |
968 | /* |
969 | * Check ftype and addresses are equal, else check next fragment | |
970 | */ | |
971 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
972 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
973 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
974 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
975 | continue; | |
976 | ||
ab46623e | 977 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
978 | __skb_queue_purge(&entry->skb_list); |
979 | continue; | |
980 | } | |
981 | return entry; | |
982 | } | |
983 | ||
984 | return NULL; | |
985 | } | |
986 | ||
49461622 | 987 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 988 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
989 | { |
990 | struct ieee80211_hdr *hdr; | |
991 | u16 sc; | |
358c8d9d | 992 | __le16 fc; |
571ecf67 JB |
993 | unsigned int frag, seq; |
994 | struct ieee80211_fragment_entry *entry; | |
995 | struct sk_buff *skb; | |
996 | ||
b73d70ad | 997 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 998 | fc = hdr->frame_control; |
571ecf67 JB |
999 | sc = le16_to_cpu(hdr->seq_ctrl); |
1000 | frag = sc & IEEE80211_SCTL_FRAG; | |
1001 | ||
358c8d9d | 1002 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1003 | (rx->skb)->len < 24 || |
1004 | is_multicast_ether_addr(hdr->addr1))) { | |
1005 | /* not fragmented */ | |
1006 | goto out; | |
1007 | } | |
1008 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1009 | ||
1010 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1011 | ||
1012 | if (frag == 0) { | |
1013 | /* This is the first fragment of a new frame. */ | |
1014 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1015 | rx->queue, &(rx->skb)); |
8f20fc24 | 1016 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1017 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1018 | /* Store CCMP PN so that we can verify that the next |
1019 | * fragment has a sequential PN value. */ | |
1020 | entry->ccmp = 1; | |
1021 | memcpy(entry->last_pn, | |
5cf121c3 | 1022 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1023 | CCMP_PN_LEN); |
1024 | } | |
9ae54c84 | 1025 | return RX_QUEUED; |
571ecf67 JB |
1026 | } |
1027 | ||
1028 | /* This is a fragment for a frame that should already be pending in | |
1029 | * fragment cache. Add this fragment to the end of the pending entry. | |
1030 | */ | |
b73d70ad | 1031 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1032 | if (!entry) { |
1033 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1034 | return RX_DROP_MONITOR; |
571ecf67 JB |
1035 | } |
1036 | ||
1037 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1038 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1039 | if (entry->ccmp) { | |
1040 | int i; | |
1041 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1042 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1043 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1044 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1045 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1046 | pn[i]++; | |
1047 | if (pn[i]) | |
1048 | break; | |
1049 | } | |
5cf121c3 | 1050 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1051 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1052 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1053 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1054 | } | |
1055 | ||
358c8d9d | 1056 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1057 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1058 | entry->last_frag = frag; | |
1059 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1060 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1061 | rx->skb = NULL; |
9ae54c84 | 1062 | return RX_QUEUED; |
571ecf67 JB |
1063 | } |
1064 | ||
1065 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1066 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1067 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1068 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1069 | GFP_ATOMIC))) { | |
1070 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1071 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1072 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1073 | } |
1074 | } | |
1075 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1076 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1077 | dev_kfree_skb(skb); | |
1078 | } | |
1079 | ||
1080 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1081 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1082 | |
1083 | out: | |
1084 | if (rx->sta) | |
1085 | rx->sta->rx_packets++; | |
1086 | if (is_multicast_ether_addr(hdr->addr1)) | |
1087 | rx->local->dot11MulticastReceivedFrameCount++; | |
1088 | else | |
1089 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1090 | return RX_CONTINUE; |
571ecf67 JB |
1091 | } |
1092 | ||
49461622 | 1093 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1094 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1095 | { |
98f0b0a3 | 1096 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1097 | struct sk_buff *skb; |
1098 | int no_pending_pkts; | |
358c8d9d | 1099 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1100 | |
358c8d9d | 1101 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1102 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1103 | return RX_CONTINUE; |
571ecf67 | 1104 | |
05c914fe JB |
1105 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1106 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1107 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1108 | |
571ecf67 JB |
1109 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1110 | if (!skb) { | |
1111 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1112 | if (skb) | |
1113 | rx->local->total_ps_buffered--; | |
1114 | } | |
1115 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1116 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1117 | ||
1118 | if (skb) { | |
1119 | struct ieee80211_hdr *hdr = | |
1120 | (struct ieee80211_hdr *) skb->data; | |
1121 | ||
4a9a66e9 JB |
1122 | /* |
1123 | * Tell TX path to send one frame even though the STA may | |
1124 | * still remain is PS mode after this frame exchange. | |
1125 | */ | |
07346f81 | 1126 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1127 | |
1128 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1129 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1130 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1131 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1132 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1133 | ||
1134 | /* Use MoreData flag to indicate whether there are more | |
1135 | * buffered frames for this STA */ | |
836341a7 | 1136 | if (no_pending_pkts) |
571ecf67 | 1137 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1138 | else |
571ecf67 JB |
1139 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1140 | ||
1141 | dev_queue_xmit(skb); | |
1142 | ||
004c872e JB |
1143 | if (no_pending_pkts) |
1144 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1145 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1146 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1147 | /* |
1148 | * FIXME: This can be the result of a race condition between | |
1149 | * us expiring a frame and the station polling for it. | |
1150 | * Should we send it a null-func frame indicating we | |
1151 | * have nothing buffered for it? | |
1152 | */ | |
0c68ae26 | 1153 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1154 | "though there are no buffered frames for it\n", |
0c68ae26 | 1155 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1156 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1157 | } |
1158 | ||
9ae54c84 | 1159 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1160 | * count as an dropped frame. */ |
1161 | dev_kfree_skb(rx->skb); | |
1162 | ||
9ae54c84 | 1163 | return RX_QUEUED; |
571ecf67 JB |
1164 | } |
1165 | ||
49461622 | 1166 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1167 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1168 | { |
6e0d114d | 1169 | u8 *data = rx->skb->data; |
238f74a2 | 1170 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1171 | |
238f74a2 | 1172 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1173 | return RX_CONTINUE; |
6e0d114d JB |
1174 | |
1175 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1176 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1177 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1178 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1179 | /* change frame type to non QOS */ |
238f74a2 | 1180 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1181 | |
9ae54c84 | 1182 | return RX_CONTINUE; |
6e0d114d JB |
1183 | } |
1184 | ||
76ee65bf | 1185 | static int |
5cf121c3 | 1186 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1187 | { |
07346f81 | 1188 | if (unlikely(!rx->sta || |
f4ea83dd | 1189 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1190 | return -EACCES; |
571ecf67 | 1191 | |
76ee65bf | 1192 | return 0; |
571ecf67 JB |
1193 | } |
1194 | ||
76ee65bf | 1195 | static int |
358c8d9d | 1196 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1197 | { |
3017b80b | 1198 | /* |
7848ba7d JB |
1199 | * Pass through unencrypted frames if the hardware has |
1200 | * decrypted them already. | |
3017b80b | 1201 | */ |
5cf121c3 | 1202 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1203 | return 0; |
571ecf67 JB |
1204 | |
1205 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1206 | if (unlikely(!ieee80211_has_protected(fc) && |
1207 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1208 | ieee80211_is_data(fc) && |
b3fc9c6c | 1209 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1210 | return -EACCES; |
f2ca3ea4 JM |
1211 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1212 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1213 | rx->key)) | |
1214 | return -EACCES; | |
1215 | /* BIP does not use Protected field, so need to check MMIE */ | |
1216 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) | |
1217 | && ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
1218 | rx->key)) | |
1219 | return -EACCES; | |
1220 | /* | |
1221 | * When using MFP, Action frames are not allowed prior to | |
1222 | * having configured keys. | |
1223 | */ | |
1224 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1225 | ieee80211_is_robust_mgmt_frame( | |
1226 | (struct ieee80211_hdr *) rx->skb->data))) | |
1227 | return -EACCES; | |
1228 | } | |
b3fc9c6c | 1229 | |
76ee65bf | 1230 | return 0; |
571ecf67 JB |
1231 | } |
1232 | ||
76ee65bf | 1233 | static int |
e31a16d6 | 1234 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1235 | { |
1236 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1237 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1238 | ||
e31a16d6 | 1239 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
76ee65bf | 1240 | } |
571ecf67 | 1241 | |
ce3edf6d JB |
1242 | /* |
1243 | * requires that rx->skb is a frame with ethernet header | |
1244 | */ | |
358c8d9d | 1245 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1246 | { |
c97c23e3 | 1247 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1248 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1249 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1250 | ||
1251 | /* | |
1252 | * Allow EAPOL frames to us/the PAE group address regardless | |
1253 | * of whether the frame was encrypted or not. | |
1254 | */ | |
1255 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1256 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1257 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1258 | return true; | |
1259 | ||
1260 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1261 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1262 | return false; |
1263 | ||
1264 | return true; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * requires that rx->skb is a frame with ethernet header | |
1269 | */ | |
76ee65bf | 1270 | static void |
5cf121c3 | 1271 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1272 | { |
1273 | struct net_device *dev = rx->dev; | |
1274 | struct ieee80211_local *local = rx->local; | |
1275 | struct sk_buff *skb, *xmit_skb; | |
1276 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1277 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1278 | struct sta_info *dsta; | |
571ecf67 | 1279 | |
76ee65bf RR |
1280 | skb = rx->skb; |
1281 | xmit_skb = NULL; | |
571ecf67 | 1282 | |
05c914fe JB |
1283 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1284 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1285 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1286 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1287 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1288 | /* | |
1289 | * send multicast frames both to higher layers in | |
1290 | * local net stack and back to the wireless medium | |
1291 | */ | |
76ee65bf RR |
1292 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1293 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1294 | printk(KERN_DEBUG "%s: failed to clone " |
1295 | "multicast frame\n", dev->name); | |
1296 | } else { | |
571ecf67 | 1297 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1298 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1299 | /* |
1300 | * The destination station is associated to | |
1301 | * this AP (in this VLAN), so send the frame | |
1302 | * directly to it and do not pass it to local | |
1303 | * net stack. | |
571ecf67 | 1304 | */ |
76ee65bf | 1305 | xmit_skb = skb; |
571ecf67 JB |
1306 | skb = NULL; |
1307 | } | |
571ecf67 JB |
1308 | } |
1309 | } | |
1310 | ||
1311 | if (skb) { | |
d1c3a37c JB |
1312 | int align __maybe_unused; |
1313 | ||
1314 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1315 | /* | |
1316 | * 'align' will only take the values 0 or 2 here | |
1317 | * since all frames are required to be aligned | |
1318 | * to 2-byte boundaries when being passed to | |
1319 | * mac80211. That also explains the __skb_push() | |
1320 | * below. | |
1321 | */ | |
dacb6f1d | 1322 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1323 | if (align) { |
1324 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1325 | dev_kfree_skb(skb); | |
1326 | skb = NULL; | |
1327 | } else { | |
1328 | u8 *data = skb->data; | |
1329 | size_t len = skb->len; | |
1330 | u8 *new = __skb_push(skb, align); | |
1331 | memmove(new, data, len); | |
1332 | __skb_trim(skb, len); | |
1333 | } | |
1334 | } | |
1335 | #endif | |
1336 | ||
1337 | if (skb) { | |
1338 | /* deliver to local stack */ | |
1339 | skb->protocol = eth_type_trans(skb, dev); | |
1340 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1341 | netif_rx(skb); | |
1342 | } | |
571ecf67 JB |
1343 | } |
1344 | ||
76ee65bf | 1345 | if (xmit_skb) { |
571ecf67 | 1346 | /* send to wireless media */ |
f831e909 | 1347 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1348 | skb_reset_network_header(xmit_skb); |
1349 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1350 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1351 | } |
76ee65bf RR |
1352 | } |
1353 | ||
49461622 | 1354 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1355 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1356 | { |
1357 | struct net_device *dev = rx->dev; | |
1358 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1359 | u16 ethertype; |
fd4c7f2f RR |
1360 | u8 *payload; |
1361 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1362 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1363 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1364 | const struct ethhdr *eth; |
1365 | int remaining, err; | |
1366 | u8 dst[ETH_ALEN]; | |
1367 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1368 | |
358c8d9d | 1369 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1370 | return RX_CONTINUE; |
fd4c7f2f | 1371 | |
358c8d9d | 1372 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1373 | return RX_DROP_MONITOR; |
fd4c7f2f | 1374 | |
5cf121c3 | 1375 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1376 | return RX_CONTINUE; |
fd4c7f2f | 1377 | |
e31a16d6 | 1378 | err = __ieee80211_data_to_8023(rx); |
fd4c7f2f | 1379 | if (unlikely(err)) |
e4c26add | 1380 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1381 | |
1382 | skb->dev = dev; | |
1383 | ||
1384 | dev->stats.rx_packets++; | |
1385 | dev->stats.rx_bytes += skb->len; | |
1386 | ||
1387 | /* skip the wrapping header */ | |
1388 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1389 | if (!eth) | |
e4c26add | 1390 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1391 | |
1392 | while (skb != frame) { | |
1393 | u8 padding; | |
1394 | __be16 len = eth->h_proto; | |
1395 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1396 | ||
1397 | remaining = skb->len; | |
1398 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1399 | memcpy(src, eth->h_source, ETH_ALEN); | |
1400 | ||
1401 | padding = ((4 - subframe_len) & 0x3); | |
1402 | /* the last MSDU has no padding */ | |
f4ea83dd | 1403 | if (subframe_len > remaining) |
e4c26add | 1404 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1405 | |
1406 | skb_pull(skb, sizeof(struct ethhdr)); | |
1407 | /* if last subframe reuse skb */ | |
1408 | if (remaining <= subframe_len + padding) | |
1409 | frame = skb; | |
1410 | else { | |
d1c3a37c JB |
1411 | /* |
1412 | * Allocate and reserve two bytes more for payload | |
1413 | * alignment since sizeof(struct ethhdr) is 14. | |
1414 | */ | |
1415 | frame = dev_alloc_skb( | |
1416 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1417 | subframe_len + 2); | |
fd4c7f2f RR |
1418 | |
1419 | if (frame == NULL) | |
e4c26add | 1420 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1421 | |
d1c3a37c JB |
1422 | skb_reserve(frame, |
1423 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1424 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1425 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1426 | ntohs(len)); | |
1427 | ||
1428 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1429 | padding); | |
1430 | if (!eth) { | |
fd4c7f2f | 1431 | dev_kfree_skb(frame); |
e4c26add | 1432 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1433 | } |
1434 | } | |
1435 | ||
ce3edf6d | 1436 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1437 | frame->dev = dev; |
1438 | frame->priority = skb->priority; | |
1439 | rx->skb = frame; | |
1440 | ||
fd4c7f2f RR |
1441 | payload = frame->data; |
1442 | ethertype = (payload[6] << 8) | payload[7]; | |
1443 | ||
1444 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1445 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1446 | compare_ether_addr(payload, | |
1447 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1448 | /* remove RFC1042 or Bridge-Tunnel |
1449 | * encapsulation and replace EtherType */ | |
1450 | skb_pull(frame, 6); | |
1451 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1452 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1453 | } else { | |
ce3edf6d JB |
1454 | memcpy(skb_push(frame, sizeof(__be16)), |
1455 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1456 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1457 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1458 | } | |
1459 | ||
358c8d9d | 1460 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1461 | if (skb == frame) /* last frame */ |
e4c26add | 1462 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1463 | dev_kfree_skb(frame); |
1464 | continue; | |
1465 | } | |
fd4c7f2f RR |
1466 | |
1467 | ieee80211_deliver_skb(rx); | |
1468 | } | |
1469 | ||
9ae54c84 | 1470 | return RX_QUEUED; |
fd4c7f2f RR |
1471 | } |
1472 | ||
bf94e17b | 1473 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1474 | static ieee80211_rx_result |
e32f85f7 LCC |
1475 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1476 | { | |
1477 | struct ieee80211_hdr *hdr; | |
1478 | struct ieee80211s_hdr *mesh_hdr; | |
1479 | unsigned int hdrlen; | |
1480 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1481 | ||
1482 | hdr = (struct ieee80211_hdr *) skb->data; | |
1483 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1484 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1485 | ||
1486 | if (!ieee80211_is_data(hdr->frame_control)) | |
1487 | return RX_CONTINUE; | |
1488 | ||
1489 | if (!mesh_hdr->ttl) | |
1490 | /* illegal frame */ | |
1491 | return RX_DROP_MONITOR; | |
1492 | ||
79617dee Y |
1493 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1494 | struct ieee80211_sub_if_data *sdata; | |
1495 | struct mesh_path *mppath; | |
1496 | ||
1497 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1498 | rcu_read_lock(); | |
1499 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1500 | if (!mppath) { | |
1501 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1502 | } else { | |
1503 | spin_lock_bh(&mppath->state_lock); | |
1504 | mppath->exp_time = jiffies; | |
1505 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1506 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1507 | spin_unlock_bh(&mppath->state_lock); | |
1508 | } | |
1509 | rcu_read_unlock(); | |
1510 | } | |
1511 | ||
e32f85f7 LCC |
1512 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1513 | return RX_CONTINUE; | |
1514 | ||
1515 | mesh_hdr->ttl--; | |
1516 | ||
1517 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1518 | if (!mesh_hdr->ttl) | |
472dbc45 | 1519 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1520 | dropped_frames_ttl); |
1521 | else { | |
1522 | struct ieee80211_hdr *fwd_hdr; | |
1523 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1524 | ||
1525 | if (!fwd_skb && net_ratelimit()) | |
1526 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1527 | rx->dev->name); | |
1528 | ||
1529 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1530 | /* | |
1531 | * Save TA to addr1 to send TA a path error if a | |
1532 | * suitable next hop is not found | |
1533 | */ | |
1534 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1535 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1536 | fwd_skb->dev = rx->local->mdev; | |
1537 | fwd_skb->iif = rx->dev->ifindex; | |
1538 | dev_queue_xmit(fwd_skb); | |
1539 | } | |
1540 | } | |
1541 | ||
1542 | if (is_multicast_ether_addr(hdr->addr3) || | |
1543 | rx->dev->flags & IFF_PROMISC) | |
1544 | return RX_CONTINUE; | |
1545 | else | |
1546 | return RX_DROP_MONITOR; | |
1547 | } | |
bf94e17b | 1548 | #endif |
e32f85f7 | 1549 | |
49461622 | 1550 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1551 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1552 | { |
1553 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1554 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1555 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1556 | int err; |
76ee65bf | 1557 | |
358c8d9d | 1558 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1559 | return RX_CONTINUE; |
76ee65bf | 1560 | |
358c8d9d | 1561 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1562 | return RX_DROP_MONITOR; |
76ee65bf | 1563 | |
e31a16d6 | 1564 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1565 | if (unlikely(err)) |
e4c26add | 1566 | return RX_DROP_UNUSABLE; |
76ee65bf | 1567 | |
358c8d9d | 1568 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1569 | return RX_DROP_MONITOR; |
ce3edf6d | 1570 | |
76ee65bf RR |
1571 | rx->skb->dev = dev; |
1572 | ||
1573 | dev->stats.rx_packets++; | |
1574 | dev->stats.rx_bytes += rx->skb->len; | |
1575 | ||
1576 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1577 | |
9ae54c84 | 1578 | return RX_QUEUED; |
571ecf67 JB |
1579 | } |
1580 | ||
49461622 | 1581 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1582 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1583 | { |
1584 | struct ieee80211_local *local = rx->local; | |
1585 | struct ieee80211_hw *hw = &local->hw; | |
1586 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1587 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1588 | struct tid_ampdu_rx *tid_agg_rx; |
1589 | u16 start_seq_num; | |
1590 | u16 tid; | |
1591 | ||
a7767f95 | 1592 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1593 | return RX_CONTINUE; |
71364716 | 1594 | |
a7767f95 | 1595 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1596 | if (!rx->sta) |
9ae54c84 | 1597 | return RX_CONTINUE; |
71364716 | 1598 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1599 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1600 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1601 | return RX_CONTINUE; |
cee24a3e | 1602 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1603 | |
1604 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1605 | ||
1606 | /* reset session timer */ | |
20ad19d0 JB |
1607 | if (tid_agg_rx->timeout) |
1608 | mod_timer(&tid_agg_rx->session_timer, | |
1609 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1610 | |
1611 | /* manage reordering buffer according to requested */ | |
1612 | /* sequence number */ | |
1613 | rcu_read_lock(); | |
f1d58c25 | 1614 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, |
71364716 RR |
1615 | start_seq_num, 1); |
1616 | rcu_read_unlock(); | |
e4c26add | 1617 | return RX_DROP_UNUSABLE; |
71364716 RR |
1618 | } |
1619 | ||
9ae54c84 | 1620 | return RX_CONTINUE; |
71364716 RR |
1621 | } |
1622 | ||
f4f727a6 JM |
1623 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1624 | struct ieee80211_mgmt *mgmt, | |
1625 | size_t len) | |
fea14732 JM |
1626 | { |
1627 | struct ieee80211_local *local = sdata->local; | |
1628 | struct sk_buff *skb; | |
1629 | struct ieee80211_mgmt *resp; | |
1630 | ||
1631 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1632 | /* Not to own unicast address */ | |
1633 | return; | |
1634 | } | |
1635 | ||
46900298 JB |
1636 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1637 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1638 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1639 | return; |
1640 | } | |
1641 | ||
1642 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1643 | /* Too short SA Query request frame */ | |
1644 | return; | |
1645 | } | |
1646 | ||
1647 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1648 | if (skb == NULL) | |
1649 | return; | |
1650 | ||
1651 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1652 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1653 | memset(resp, 0, 24); | |
1654 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1655 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1656 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1657 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1658 | IEEE80211_STYPE_ACTION); | |
1659 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1660 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1661 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1662 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1663 | mgmt->u.action.u.sa_query.trans_id, | |
1664 | WLAN_SA_QUERY_TR_ID_LEN); | |
1665 | ||
1666 | ieee80211_tx_skb(sdata, skb, 1); | |
1667 | } | |
1668 | ||
de1ede7a JB |
1669 | static ieee80211_rx_result debug_noinline |
1670 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1671 | { | |
1672 | struct ieee80211_local *local = rx->local; | |
1673 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1674 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
1675 | int len = rx->skb->len; | |
1676 | ||
1677 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1678 | return RX_CONTINUE; | |
1679 | ||
1680 | if (!rx->sta) | |
1681 | return RX_DROP_MONITOR; | |
1682 | ||
1683 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1684 | return RX_DROP_MONITOR; | |
1685 | ||
97ebe12a JM |
1686 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1687 | return RX_DROP_MONITOR; | |
1688 | ||
de1ede7a JB |
1689 | /* all categories we currently handle have action_code */ |
1690 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1691 | return RX_DROP_MONITOR; | |
1692 | ||
de1ede7a JB |
1693 | switch (mgmt->u.action.category) { |
1694 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1695 | /* |
1696 | * The aggregation code is not prepared to handle | |
1697 | * anything but STA/AP due to the BSSID handling; | |
1698 | * IBSS could work in the code but isn't supported | |
1699 | * by drivers or the standard. | |
1700 | */ | |
1701 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1702 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1703 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1704 | return RX_DROP_MONITOR; | |
1705 | ||
de1ede7a JB |
1706 | switch (mgmt->u.action.u.addba_req.action_code) { |
1707 | case WLAN_ACTION_ADDBA_REQ: | |
1708 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1709 | sizeof(mgmt->u.action.u.addba_req))) | |
1710 | return RX_DROP_MONITOR; | |
1711 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1712 | break; | |
1713 | case WLAN_ACTION_ADDBA_RESP: | |
1714 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1715 | sizeof(mgmt->u.action.u.addba_resp))) | |
1716 | return RX_DROP_MONITOR; | |
1717 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1718 | break; | |
1719 | case WLAN_ACTION_DELBA: | |
1720 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1721 | sizeof(mgmt->u.action.u.delba))) | |
1722 | return RX_DROP_MONITOR; | |
1723 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1724 | break; | |
1725 | } | |
39192c0b JB |
1726 | break; |
1727 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1728 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1729 | return RX_DROP_MONITOR; | |
46900298 JB |
1730 | |
1731 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1732 | return RX_DROP_MONITOR; | |
1733 | ||
39192c0b JB |
1734 | switch (mgmt->u.action.u.measurement.action_code) { |
1735 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1736 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1737 | sizeof(mgmt->u.action.u.measurement))) | |
1738 | return RX_DROP_MONITOR; | |
1739 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1740 | break; | |
c481ec97 S |
1741 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1742 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1743 | sizeof(mgmt->u.action.u.chan_switch))) | |
1744 | return RX_DROP_MONITOR; | |
1745 | ||
cc32abd4 JB |
1746 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1747 | return RX_DROP_MONITOR; | |
1748 | ||
46900298 | 1749 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1750 | return RX_DROP_MONITOR; |
1751 | ||
77fdaa12 | 1752 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1753 | } |
1754 | break; | |
fea14732 JM |
1755 | case WLAN_CATEGORY_SA_QUERY: |
1756 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1757 | sizeof(mgmt->u.action.u.sa_query))) | |
1758 | return RX_DROP_MONITOR; | |
1759 | switch (mgmt->u.action.u.sa_query.action) { | |
1760 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1761 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1762 | return RX_DROP_MONITOR; | |
1763 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1764 | break; | |
1765 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1766 | /* | |
1767 | * SA Query response is currently only used in AP mode | |
1768 | * and it is processed in user space. | |
1769 | */ | |
1770 | return RX_CONTINUE; | |
1771 | } | |
1772 | break; | |
39192c0b JB |
1773 | default: |
1774 | return RX_CONTINUE; | |
de1ede7a JB |
1775 | } |
1776 | ||
39192c0b JB |
1777 | rx->sta->rx_packets++; |
1778 | dev_kfree_skb(rx->skb); | |
1779 | return RX_QUEUED; | |
de1ede7a JB |
1780 | } |
1781 | ||
49461622 | 1782 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1783 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1784 | { |
759ef3eb | 1785 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1786 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1787 | |
5cf121c3 | 1788 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1789 | return RX_DROP_MONITOR; |
571ecf67 | 1790 | |
97ebe12a JM |
1791 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1792 | return RX_DROP_MONITOR; | |
1793 | ||
472dbc45 | 1794 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 1795 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 1796 | |
3832c287 | 1797 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 1798 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 1799 | |
7986cf95 | 1800 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 1801 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 1802 | |
7986cf95 | 1803 | return RX_DROP_MONITOR; |
571ecf67 JB |
1804 | } |
1805 | ||
571ecf67 JB |
1806 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1807 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1808 | struct ieee80211_rx_data *rx) |
571ecf67 | 1809 | { |
a7767f95 HH |
1810 | int keyidx; |
1811 | unsigned int hdrlen; | |
571ecf67 | 1812 | |
a7767f95 | 1813 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1814 | if (rx->skb->len >= hdrlen + 4) |
1815 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1816 | else | |
1817 | keyidx = -1; | |
1818 | ||
8944b79f | 1819 | if (!rx->sta) { |
aa0daf0e JB |
1820 | /* |
1821 | * Some hardware seem to generate incorrect Michael MIC | |
1822 | * reports; ignore them to avoid triggering countermeasures. | |
1823 | */ | |
571ecf67 JB |
1824 | goto ignore; |
1825 | } | |
1826 | ||
a7767f95 | 1827 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1828 | goto ignore; |
571ecf67 | 1829 | |
05c914fe | 1830 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1831 | /* |
1832 | * APs with pairwise keys should never receive Michael MIC | |
1833 | * errors for non-zero keyidx because these are reserved for | |
1834 | * group keys and only the AP is sending real multicast | |
1835 | * frames in the BSS. | |
1836 | */ | |
eb063c17 | 1837 | goto ignore; |
571ecf67 JB |
1838 | } |
1839 | ||
a7767f95 HH |
1840 | if (!ieee80211_is_data(hdr->frame_control) && |
1841 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1842 | goto ignore; |
571ecf67 | 1843 | |
e6d6e342 JB |
1844 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
1845 | GFP_ATOMIC); | |
571ecf67 JB |
1846 | ignore: |
1847 | dev_kfree_skb(rx->skb); | |
1848 | rx->skb = NULL; | |
1849 | } | |
1850 | ||
5cf121c3 JB |
1851 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1852 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1853 | { |
1854 | struct ieee80211_sub_if_data *sdata; | |
1855 | struct ieee80211_local *local = rx->local; | |
1856 | struct ieee80211_rtap_hdr { | |
1857 | struct ieee80211_radiotap_header hdr; | |
1858 | u8 flags; | |
1859 | u8 rate; | |
1860 | __le16 chan_freq; | |
1861 | __le16 chan_flags; | |
1862 | } __attribute__ ((packed)) *rthdr; | |
1863 | struct sk_buff *skb = rx->skb, *skb2; | |
1864 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1865 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1866 | |
5cf121c3 | 1867 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1868 | goto out_free_skb; |
1869 | ||
1870 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1871 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1872 | goto out_free_skb; | |
1873 | ||
1874 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1875 | memset(rthdr, 0, sizeof(*rthdr)); | |
1876 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1877 | rthdr->hdr.it_present = | |
1878 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1879 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1880 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1881 | ||
5cf121c3 | 1882 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1883 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1884 | ||
1885 | if (status->band == IEEE80211_BAND_5GHZ) | |
1886 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1887 | IEEE80211_CHAN_5GHZ); | |
1888 | else | |
1889 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1890 | IEEE80211_CHAN_2GHZ); | |
1891 | ||
1892 | skb_set_mac_header(skb, 0); | |
1893 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1894 | skb->pkt_type = PACKET_OTHERHOST; | |
1895 | skb->protocol = htons(ETH_P_802_2); | |
1896 | ||
1897 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1898 | if (!netif_running(sdata->dev)) | |
1899 | continue; | |
1900 | ||
05c914fe | 1901 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1902 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1903 | continue; | |
1904 | ||
1905 | if (prev_dev) { | |
1906 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1907 | if (skb2) { | |
1908 | skb2->dev = prev_dev; | |
1909 | netif_rx(skb2); | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | prev_dev = sdata->dev; | |
1914 | sdata->dev->stats.rx_packets++; | |
1915 | sdata->dev->stats.rx_bytes += skb->len; | |
1916 | } | |
1917 | ||
1918 | if (prev_dev) { | |
1919 | skb->dev = prev_dev; | |
1920 | netif_rx(skb); | |
1921 | skb = NULL; | |
1922 | } else | |
1923 | goto out_free_skb; | |
1924 | ||
5cf121c3 | 1925 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1926 | return; |
1927 | ||
1928 | out_free_skb: | |
1929 | dev_kfree_skb(skb); | |
1930 | } | |
1931 | ||
571ecf67 | 1932 | |
8944b79f | 1933 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1934 | struct ieee80211_rx_data *rx, |
8944b79f | 1935 | struct sk_buff *skb) |
58905290 | 1936 | { |
58905290 JB |
1937 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1938 | ||
8944b79f JB |
1939 | rx->skb = skb; |
1940 | rx->sdata = sdata; | |
1941 | rx->dev = sdata->dev; | |
1942 | ||
e32f85f7 LCC |
1943 | #define CALL_RXH(rxh) \ |
1944 | do { \ | |
1945 | res = rxh(rx); \ | |
1946 | if (res != RX_CONTINUE) \ | |
1947 | goto rxh_done; \ | |
1948 | } while (0); | |
49461622 JB |
1949 | |
1950 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1951 | CALL_RXH(ieee80211_rx_h_check) | |
1952 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 1953 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
1954 | CALL_RXH(ieee80211_rx_h_sta_process) |
1955 | CALL_RXH(ieee80211_rx_h_defragment) | |
1956 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1957 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1958 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1959 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1960 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1961 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1962 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1963 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1964 | #endif |
49461622 JB |
1965 | CALL_RXH(ieee80211_rx_h_data) |
1966 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1967 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1968 | CALL_RXH(ieee80211_rx_h_mgmt) |
1969 | ||
1970 | #undef CALL_RXH | |
1971 | ||
1972 | rxh_done: | |
58905290 JB |
1973 | switch (res) { |
1974 | case RX_DROP_MONITOR: | |
49461622 JB |
1975 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1976 | if (rx->sta) | |
1977 | rx->sta->rx_dropped++; | |
1978 | /* fall through */ | |
1979 | case RX_CONTINUE: | |
3d30d949 MW |
1980 | ieee80211_rx_cooked_monitor(rx); |
1981 | break; | |
58905290 | 1982 | case RX_DROP_UNUSABLE: |
49461622 JB |
1983 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1984 | if (rx->sta) | |
1985 | rx->sta->rx_dropped++; | |
58905290 JB |
1986 | dev_kfree_skb(rx->skb); |
1987 | break; | |
49461622 JB |
1988 | case RX_QUEUED: |
1989 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1990 | break; | |
58905290 JB |
1991 | } |
1992 | } | |
1993 | ||
571ecf67 JB |
1994 | /* main receive path */ |
1995 | ||
23a24def | 1996 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 1997 | struct ieee80211_rx_data *rx, |
23a24def JB |
1998 | struct ieee80211_hdr *hdr) |
1999 | { | |
7ab17c45 | 2000 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2001 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2002 | ||
51fb61e7 | 2003 | switch (sdata->vif.type) { |
05c914fe | 2004 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2005 | if (!bssid) |
2006 | return 0; | |
77fdaa12 JB |
2007 | if (!multicast && |
2008 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { | |
4150c572 | 2009 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2010 | return 0; |
5cf121c3 | 2011 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2012 | } |
2013 | break; | |
05c914fe | 2014 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2015 | if (!bssid) |
2016 | return 0; | |
a7767f95 | 2017 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2018 | return 1; |
87291c02 | 2019 | } |
46900298 | 2020 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2021 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2022 | return 0; |
5cf121c3 | 2023 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2024 | } else if (!multicast && |
2025 | compare_ether_addr(sdata->dev->dev_addr, | |
2026 | hdr->addr1) != 0) { | |
4150c572 | 2027 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2028 | return 0; |
5cf121c3 | 2029 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2030 | } else if (!rx->sta) { |
2031 | int rate_idx; | |
2032 | if (rx->status->flag & RX_FLAG_HT) | |
2033 | rate_idx = 0; /* TODO: HT rates */ | |
2034 | else | |
2035 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2036 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2037 | BIT(rate_idx)); |
2038 | } | |
23a24def | 2039 | break; |
05c914fe | 2040 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2041 | if (!multicast && |
2042 | compare_ether_addr(sdata->dev->dev_addr, | |
2043 | hdr->addr1) != 0) { | |
2044 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2045 | return 0; | |
2046 | ||
5cf121c3 | 2047 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2048 | } |
2049 | break; | |
05c914fe JB |
2050 | case NL80211_IFTYPE_AP_VLAN: |
2051 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2052 | if (!bssid) { |
2053 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2054 | hdr->addr1)) | |
2055 | return 0; | |
2056 | } else if (!ieee80211_bssid_match(bssid, | |
2057 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2058 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2059 | return 0; |
5cf121c3 | 2060 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2061 | } |
23a24def | 2062 | break; |
05c914fe | 2063 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2064 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2065 | return 0; |
2066 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2067 | return 0; | |
2068 | break; | |
05c914fe | 2069 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2070 | /* take everything */ |
2071 | break; | |
05c914fe JB |
2072 | case NL80211_IFTYPE_UNSPECIFIED: |
2073 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2074 | /* should never get here */ |
2075 | WARN_ON(1); | |
2076 | break; | |
23a24def JB |
2077 | } |
2078 | ||
2079 | return 1; | |
2080 | } | |
2081 | ||
571ecf67 | 2082 | /* |
6368e4b1 RR |
2083 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2084 | * be called with rcu_read_lock protection. | |
571ecf67 | 2085 | */ |
71ebb4aa RR |
2086 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2087 | struct sk_buff *skb, | |
8318d78a | 2088 | struct ieee80211_rate *rate) |
571ecf67 | 2089 | { |
f1d58c25 | 2090 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2091 | struct ieee80211_local *local = hw_to_local(hw); |
2092 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2093 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2094 | struct ieee80211_rx_data rx; |
6368e4b1 | 2095 | int prepares; |
8e6f0032 JB |
2096 | struct ieee80211_sub_if_data *prev = NULL; |
2097 | struct sk_buff *skb_new; | |
571ecf67 | 2098 | |
358c8d9d | 2099 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2100 | memset(&rx, 0, sizeof(rx)); |
2101 | rx.skb = skb; | |
2102 | rx.local = local; | |
2103 | ||
5cf121c3 | 2104 | rx.status = status; |
5cf121c3 | 2105 | rx.rate = rate; |
72abd81b | 2106 | |
358c8d9d | 2107 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2108 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2109 | |
8944b79f JB |
2110 | rx.sta = sta_info_get(local, hdr->addr2); |
2111 | if (rx.sta) { | |
d0709a65 JB |
2112 | rx.sdata = rx.sta->sdata; |
2113 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2114 | } |
571ecf67 | 2115 | |
571ecf67 | 2116 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2117 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2118 | return; |
571ecf67 JB |
2119 | } |
2120 | ||
c2b13452 | 2121 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2122 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2123 | |
38f3714d | 2124 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2125 | ieee80211_verify_alignment(&rx); |
38f3714d | 2126 | |
571ecf67 JB |
2127 | skb = rx.skb; |
2128 | ||
79010420 | 2129 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2130 | if (!netif_running(sdata->dev)) |
2131 | continue; | |
2132 | ||
05c914fe | 2133 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2134 | continue; |
2135 | ||
5cf121c3 | 2136 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2137 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2138 | |
6368e4b1 | 2139 | if (!prepares) |
23a24def | 2140 | continue; |
8e6f0032 | 2141 | |
340e11f3 JB |
2142 | /* |
2143 | * frame is destined for this interface, but if it's not | |
2144 | * also for the previous one we handle that after the | |
2145 | * loop to avoid copying the SKB once too much | |
2146 | */ | |
2147 | ||
2148 | if (!prev) { | |
2149 | prev = sdata; | |
2150 | continue; | |
8e6f0032 | 2151 | } |
340e11f3 JB |
2152 | |
2153 | /* | |
2154 | * frame was destined for the previous interface | |
2155 | * so invoke RX handlers for it | |
2156 | */ | |
2157 | ||
2158 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2159 | if (!skb_new) { | |
2160 | if (net_ratelimit()) | |
2161 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2162 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2163 | wiphy_name(local->hw.wiphy), |
2164 | prev->dev->name); | |
340e11f3 JB |
2165 | continue; |
2166 | } | |
8944b79f | 2167 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2168 | prev = sdata; |
571ecf67 | 2169 | } |
a4b7d7bd | 2170 | if (prev) |
8944b79f | 2171 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2172 | else |
8e6f0032 | 2173 | dev_kfree_skb(skb); |
571ecf67 | 2174 | } |
6368e4b1 | 2175 | |
b580781e RR |
2176 | #define SEQ_MODULO 0x1000 |
2177 | #define SEQ_MASK 0xfff | |
2178 | ||
2179 | static inline int seq_less(u16 sq1, u16 sq2) | |
2180 | { | |
c6a1fa12 | 2181 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2182 | } |
2183 | ||
2184 | static inline u16 seq_inc(u16 sq) | |
2185 | { | |
c6a1fa12 | 2186 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2187 | } |
2188 | ||
2189 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2190 | { | |
c6a1fa12 | 2191 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2192 | } |
2193 | ||
2194 | ||
2d3babd1 JM |
2195 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
2196 | struct tid_ampdu_rx *tid_agg_rx, | |
2197 | int index) | |
2198 | { | |
2199 | struct ieee80211_supported_band *sband; | |
2200 | struct ieee80211_rate *rate; | |
f1d58c25 JB |
2201 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
2202 | struct ieee80211_rx_status *status; | |
2d3babd1 | 2203 | |
f1d58c25 | 2204 | if (!skb) |
2d3babd1 JM |
2205 | goto no_frame; |
2206 | ||
f1d58c25 JB |
2207 | status = IEEE80211_SKB_RXCB(skb); |
2208 | ||
2d3babd1 | 2209 | /* release the reordered frames to stack */ |
f1d58c25 JB |
2210 | sband = hw->wiphy->bands[status->band]; |
2211 | if (status->flag & RX_FLAG_HT) | |
2d3babd1 JM |
2212 | rate = sband->bitrates; /* TODO: HT rates */ |
2213 | else | |
f1d58c25 JB |
2214 | rate = &sband->bitrates[status->rate_idx]; |
2215 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
2d3babd1 JM |
2216 | tid_agg_rx->stored_mpdu_num--; |
2217 | tid_agg_rx->reorder_buf[index] = NULL; | |
2218 | ||
2219 | no_frame: | |
2220 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2221 | } | |
2222 | ||
2223 | ||
4d050f1d JM |
2224 | /* |
2225 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
2226 | * the skb was added to the buffer longer than this time ago, the earlier | |
2227 | * frames that have not yet been received are assumed to be lost and the skb | |
2228 | * can be released for processing. This may also release other skb's from the | |
2229 | * reorder buffer if there are no additional gaps between the frames. | |
2230 | */ | |
2231 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
2232 | ||
71364716 RR |
2233 | /* |
2234 | * As it function blongs to Rx path it must be called with | |
2235 | * the proper rcu_read_lock protection for its flow. | |
2236 | */ | |
c6a1fa12 JB |
2237 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2238 | struct tid_ampdu_rx *tid_agg_rx, | |
2239 | struct sk_buff *skb, | |
2240 | u16 mpdu_seq_num, | |
2241 | int bar_req) | |
b580781e | 2242 | { |
b580781e RR |
2243 | u16 head_seq_num, buf_size; |
2244 | int index; | |
b580781e RR |
2245 | |
2246 | buf_size = tid_agg_rx->buf_size; | |
2247 | head_seq_num = tid_agg_rx->head_seq_num; | |
2248 | ||
2249 | /* frame with out of date sequence number */ | |
2250 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2251 | dev_kfree_skb(skb); | |
2252 | return 1; | |
2253 | } | |
2254 | ||
2255 | /* if frame sequence number exceeds our buffering window size or | |
2256 | * block Ack Request arrived - release stored frames */ | |
2257 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2258 | /* new head to the ordering buffer */ | |
2259 | if (bar_req) | |
2260 | head_seq_num = mpdu_seq_num; | |
2261 | else | |
2262 | head_seq_num = | |
2263 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2264 | /* release stored frames up to new head to stack */ | |
2265 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2266 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2267 | tid_agg_rx->ssn) | |
2268 | % tid_agg_rx->buf_size; | |
2d3babd1 JM |
2269 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
2270 | index); | |
b580781e RR |
2271 | } |
2272 | if (bar_req) | |
2273 | return 1; | |
2274 | } | |
2275 | ||
2276 | /* now the new frame is always in the range of the reordering */ | |
2277 | /* buffer window */ | |
2278 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2279 | % tid_agg_rx->buf_size; | |
2280 | /* check if we already stored this frame */ | |
2281 | if (tid_agg_rx->reorder_buf[index]) { | |
2282 | dev_kfree_skb(skb); | |
2283 | return 1; | |
2284 | } | |
2285 | ||
2286 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2287 | /* release it immediately */ | |
2288 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2289 | tid_agg_rx->stored_mpdu_num == 0) { | |
2290 | tid_agg_rx->head_seq_num = | |
2291 | seq_inc(tid_agg_rx->head_seq_num); | |
2292 | return 0; | |
2293 | } | |
2294 | ||
2295 | /* put the frame in the reordering buffer */ | |
2296 | tid_agg_rx->reorder_buf[index] = skb; | |
4d050f1d | 2297 | tid_agg_rx->reorder_time[index] = jiffies; |
b580781e RR |
2298 | tid_agg_rx->stored_mpdu_num++; |
2299 | /* release the buffer until next missing frame */ | |
2300 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2301 | % tid_agg_rx->buf_size; | |
4d050f1d JM |
2302 | if (!tid_agg_rx->reorder_buf[index] && |
2303 | tid_agg_rx->stored_mpdu_num > 1) { | |
2304 | /* | |
2305 | * No buffers ready to be released, but check whether any | |
2306 | * frames in the reorder buffer have timed out. | |
2307 | */ | |
2308 | int j; | |
2309 | int skipped = 1; | |
2310 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
2311 | j = (j + 1) % tid_agg_rx->buf_size) { | |
2312 | if (tid_agg_rx->reorder_buf[j] == NULL) { | |
2313 | skipped++; | |
2314 | continue; | |
2315 | } | |
2316 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
2317 | HZ / 10)) | |
2318 | break; | |
2319 | ||
2320 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
2321 | if (net_ratelimit()) | |
2322 | printk(KERN_DEBUG "%s: release an RX reorder " | |
2323 | "frame due to timeout on earlier " | |
2324 | "frames\n", | |
2325 | wiphy_name(hw->wiphy)); | |
2326 | #endif | |
2327 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); | |
2328 | ||
2329 | /* | |
2330 | * Increment the head seq# also for the skipped slots. | |
2331 | */ | |
2332 | tid_agg_rx->head_seq_num = | |
2333 | (tid_agg_rx->head_seq_num + skipped) & | |
2334 | SEQ_MASK; | |
2335 | skipped = 0; | |
2336 | } | |
2337 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2d3babd1 | 2338 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
b580781e RR |
2339 | index = seq_sub(tid_agg_rx->head_seq_num, |
2340 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2341 | } | |
2342 | return 1; | |
2343 | } | |
2344 | ||
71ebb4aa | 2345 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
f1d58c25 | 2346 | struct sk_buff *skb) |
b580781e RR |
2347 | { |
2348 | struct ieee80211_hw *hw = &local->hw; | |
2349 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2350 | struct sta_info *sta; | |
2351 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2352 | u16 sc; |
b580781e | 2353 | u16 mpdu_seq_num; |
182503ab | 2354 | u8 ret = 0; |
b580781e RR |
2355 | int tid; |
2356 | ||
2357 | sta = sta_info_get(local, hdr->addr2); | |
2358 | if (!sta) | |
2359 | return ret; | |
2360 | ||
b580781e RR |
2361 | /* filter the QoS data rx stream according to |
2362 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2363 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2364 | goto end_reorder; |
2365 | ||
238f74a2 | 2366 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2367 | |
cee24a3e | 2368 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2369 | goto end_reorder; |
2370 | ||
cee24a3e RR |
2371 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2372 | ||
2560b6e2 EG |
2373 | /* qos null data frames are excluded */ |
2374 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2375 | goto end_reorder; |
2376 | ||
2377 | /* new un-ordered ampdu frame - process it */ | |
2378 | ||
2379 | /* reset session timer */ | |
20ad19d0 JB |
2380 | if (tid_agg_rx->timeout) |
2381 | mod_timer(&tid_agg_rx->session_timer, | |
2382 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2383 | |
2384 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2385 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2386 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2387 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2388 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2389 | ret = 1; | |
2390 | goto end_reorder; | |
2391 | } | |
2392 | ||
2393 | /* according to mpdu sequence number deal with reordering buffer */ | |
2394 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
f1d58c25 | 2395 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, |
b580781e | 2396 | mpdu_seq_num, 0); |
d0709a65 | 2397 | end_reorder: |
b580781e RR |
2398 | return ret; |
2399 | } | |
2400 | ||
6368e4b1 RR |
2401 | /* |
2402 | * This is the receive path handler. It is called by a low level driver when an | |
2403 | * 802.11 MPDU is received from the hardware. | |
2404 | */ | |
f1d58c25 | 2405 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2406 | { |
2407 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2408 | struct ieee80211_rate *rate = NULL; |
2409 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2410 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a JB |
2411 | |
2412 | if (status->band < 0 || | |
13d8fd2d | 2413 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2414 | WARN_ON(1); |
2415 | return; | |
2416 | } | |
2417 | ||
2418 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2419 | if (!sband) { |
8318d78a JB |
2420 | WARN_ON(1); |
2421 | return; | |
2422 | } | |
2423 | ||
0fb8ca45 JM |
2424 | if (status->flag & RX_FLAG_HT) { |
2425 | /* rate_idx is MCS index */ | |
2426 | if (WARN_ON(status->rate_idx < 0 || | |
2427 | status->rate_idx >= 76)) | |
2428 | return; | |
2429 | /* HT rates are not in the table - use the highest legacy rate | |
2430 | * for now since other parts of mac80211 may not yet be fully | |
2431 | * MCS aware. */ | |
2432 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2433 | } else { | |
2434 | if (WARN_ON(status->rate_idx < 0 || | |
2435 | status->rate_idx >= sband->n_bitrates)) | |
2436 | return; | |
2437 | rate = &sband->bitrates[status->rate_idx]; | |
2438 | } | |
6368e4b1 RR |
2439 | |
2440 | /* | |
2441 | * key references and virtual interfaces are protected using RCU | |
2442 | * and this requires that we are in a read-side RCU section during | |
2443 | * receive processing | |
2444 | */ | |
2445 | rcu_read_lock(); | |
2446 | ||
2447 | /* | |
2448 | * Frames with failed FCS/PLCP checksum are not returned, | |
2449 | * all other frames are returned without radiotap header | |
2450 | * if it was previously present. | |
2451 | * Also, frames with less than 16 bytes are dropped. | |
2452 | */ | |
f1d58c25 | 2453 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2454 | if (!skb) { |
2455 | rcu_read_unlock(); | |
2456 | return; | |
2457 | } | |
2458 | ||
aec67952 JM |
2459 | /* |
2460 | * In theory, the block ack reordering should happen after duplicate | |
2461 | * removal (ieee80211_rx_h_check(), which is an RX handler). As such, | |
2462 | * the call to ieee80211_rx_reorder_ampdu() should really be moved to | |
2463 | * happen as a new RX handler between ieee80211_rx_h_check and | |
2464 | * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for | |
2465 | * the time being, the call can be here since RX reorder buf processing | |
2466 | * will implicitly skip duplicates. We could, in theory at least, | |
2467 | * process frames that ieee80211_rx_h_passive_scan would drop (e.g., | |
2468 | * frames from other than operational channel), but that should not | |
2469 | * happen in normal networks. | |
2470 | */ | |
f1d58c25 JB |
2471 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
2472 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
6368e4b1 RR |
2473 | |
2474 | rcu_read_unlock(); | |
2475 | } | |
571ecf67 JB |
2476 | EXPORT_SYMBOL(__ieee80211_rx); |
2477 | ||
2478 | /* This is a version of the rx handler that can be called from hard irq | |
2479 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2480 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2481 | { |
2482 | struct ieee80211_local *local = hw_to_local(hw); | |
2483 | ||
2484 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2485 | ||
2486 | skb->dev = local->mdev; | |
571ecf67 JB |
2487 | skb->pkt_type = IEEE80211_RX_MSG; |
2488 | skb_queue_tail(&local->skb_queue, skb); | |
2489 | tasklet_schedule(&local->tasklet); | |
2490 | } | |
2491 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |