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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" | |
2c8dccc7 | 22 | #include "led.h" |
33b64eb2 | 23 | #include "mesh.h" |
571ecf67 JB |
24 | #include "wep.h" |
25 | #include "wpa.h" | |
26 | #include "tkip.h" | |
27 | #include "wme.h" | |
28 | ||
c6a1fa12 JB |
29 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
30 | struct tid_ampdu_rx *tid_agg_rx, | |
31 | struct sk_buff *skb, | |
b3631286 | 32 | struct ieee80211_rx_status *status, |
c6a1fa12 JB |
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 | ||
61 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
62 | struct sk_buff *skb, | |
63 | int present_fcs_len, | |
64 | int radiotap_len) | |
65 | { | |
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, | |
113 | struct ieee80211_rx_status *status, | |
114 | struct ieee80211_rate *rate, | |
115 | int rtap_len) | |
116 | { | |
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 JB |
222 | struct ieee80211_rx_status *status, |
223 | struct ieee80211_rate *rate) | |
b2e7771e JB |
224 | { |
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) { | |
250 | if (should_drop_frame(status, origskb, present_fcs_len, | |
251 | rtap_len)) { | |
252 | dev_kfree_skb(origskb); | |
253 | return NULL; | |
254 | } | |
255 | ||
256 | return remove_monitor_info(local, origskb, rtap_len); | |
257 | } | |
258 | ||
259 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
260 | /* only need to expand headroom if necessary */ | |
261 | skb = origskb; | |
262 | origskb = NULL; | |
263 | ||
264 | /* | |
265 | * This shouldn't trigger often because most devices have an | |
266 | * RX header they pull before we get here, and that should | |
267 | * be big enough for our radiotap information. We should | |
268 | * probably export the length to drivers so that we can have | |
269 | * them allocate enough headroom to start with. | |
270 | */ | |
271 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 272 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
273 | dev_kfree_skb(skb); |
274 | return NULL; | |
275 | } | |
276 | } else { | |
277 | /* | |
278 | * Need to make a copy and possibly remove radiotap header | |
279 | * and FCS from the original. | |
280 | */ | |
281 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
282 | ||
283 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
284 | ||
285 | if (!skb) | |
286 | return origskb; | |
287 | } | |
288 | ||
289 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
290 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
291 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
292 | needed_headroom); | |
b2e7771e | 293 | |
ce3edf6d | 294 | skb_reset_mac_header(skb); |
b2e7771e JB |
295 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296 | skb->pkt_type = PACKET_OTHERHOST; | |
297 | skb->protocol = htons(ETH_P_802_2); | |
298 | ||
299 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
300 | if (!netif_running(sdata->dev)) | |
301 | continue; | |
302 | ||
05c914fe | 303 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
304 | continue; |
305 | ||
3d30d949 MW |
306 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
307 | continue; | |
308 | ||
b2e7771e JB |
309 | if (prev_dev) { |
310 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
311 | if (skb2) { | |
312 | skb2->dev = prev_dev; | |
313 | netif_rx(skb2); | |
314 | } | |
315 | } | |
316 | ||
317 | prev_dev = sdata->dev; | |
318 | sdata->dev->stats.rx_packets++; | |
319 | sdata->dev->stats.rx_bytes += skb->len; | |
320 | } | |
321 | ||
322 | if (prev_dev) { | |
323 | skb->dev = prev_dev; | |
324 | netif_rx(skb); | |
325 | } else | |
326 | dev_kfree_skb(skb); | |
327 | ||
328 | return origskb; | |
329 | } | |
330 | ||
331 | ||
5cf121c3 | 332 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 333 | { |
238f74a2 | 334 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
335 | int tid; |
336 | ||
337 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
338 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
339 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 340 | /* frame has qos control */ |
238f74a2 HH |
341 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
342 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 343 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 344 | else |
5cf121c3 | 345 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 346 | } else { |
1411f9b5 JB |
347 | /* |
348 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
349 | * | |
350 | * Sequence numbers for management frames, QoS data | |
351 | * frames with a broadcast/multicast address in the | |
352 | * Address 1 field, and all non-QoS data frames sent | |
353 | * by QoS STAs are assigned using an additional single | |
354 | * modulo-4096 counter, [...] | |
355 | * | |
356 | * We also use that counter for non-QoS STAs. | |
357 | */ | |
358 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 359 | } |
52865dfd | 360 | |
5cf121c3 | 361 | rx->queue = tid; |
6e0d114d JB |
362 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
363 | * For now, set skb->priority to 0 for other cases. */ | |
364 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 365 | } |
6e0d114d | 366 | |
d1c3a37c JB |
367 | /** |
368 | * DOC: Packet alignment | |
369 | * | |
370 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
371 | * to the stack. | |
372 | * | |
373 | * Additionally, should, if possible, align the payload data in a way that | |
374 | * guarantees that the contained IP header is aligned to a four-byte | |
375 | * boundary. In the case of regular frames, this simply means aligning the | |
376 | * payload to a four-byte boundary (because either the IP header is directly | |
377 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
378 | * in front of it). | |
379 | * | |
380 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
381 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
382 | * push the IP header further back to a multiple of four again. Thankfully, the | |
383 | * specs were sane enough this time around to require padding each A-MSDU | |
384 | * subframe to a length that is a multiple of four. | |
385 | * | |
386 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
387 | * the payload is not supported, the driver is required to move the 802.11 | |
388 | * header to be directly in front of the payload in that case. | |
389 | */ | |
390 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 391 | { |
a7767f95 | 392 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
393 | int hdrlen; |
394 | ||
d1c3a37c JB |
395 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
396 | return; | |
397 | #endif | |
398 | ||
399 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
400 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
401 | return; | |
402 | ||
a7767f95 | 403 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
404 | return; |
405 | ||
a7767f95 | 406 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 407 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 408 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
409 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
410 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
411 | } |
412 | ||
6368e4b1 | 413 | |
571ecf67 JB |
414 | /* rx handlers */ |
415 | ||
49461622 | 416 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 417 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
418 | { |
419 | struct ieee80211_local *local = rx->local; | |
420 | struct sk_buff *skb = rx->skb; | |
421 | ||
c2b13452 JB |
422 | if (unlikely(local->hw_scanning)) |
423 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 424 | |
c2b13452 | 425 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 426 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 427 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 428 | != RX_QUEUED) |
ece8eddd | 429 | dev_kfree_skb(skb); |
9ae54c84 | 430 | return RX_QUEUED; |
571ecf67 JB |
431 | } |
432 | ||
5cf121c3 | 433 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
434 | /* scanning finished during invoking of handlers */ |
435 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 436 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
437 | } |
438 | ||
9ae54c84 | 439 | return RX_CONTINUE; |
571ecf67 JB |
440 | } |
441 | ||
3cfcf6ac JM |
442 | |
443 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
444 | { | |
445 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
446 | ||
447 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
448 | return 0; | |
449 | ||
450 | return ieee80211_is_robust_mgmt_frame(hdr); | |
451 | } | |
452 | ||
453 | ||
454 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
455 | { | |
456 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
457 | ||
458 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
459 | return 0; | |
460 | ||
461 | return ieee80211_is_robust_mgmt_frame(hdr); | |
462 | } | |
463 | ||
464 | ||
465 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
466 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
467 | { | |
468 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
469 | struct ieee80211_mmie *mmie; | |
470 | ||
471 | if (skb->len < 24 + sizeof(*mmie) || | |
472 | !is_multicast_ether_addr(hdr->da)) | |
473 | return -1; | |
474 | ||
475 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
476 | return -1; /* not a robust management frame */ | |
477 | ||
478 | mmie = (struct ieee80211_mmie *) | |
479 | (skb->data + skb->len - sizeof(*mmie)); | |
480 | if (mmie->element_id != WLAN_EID_MMIE || | |
481 | mmie->length != sizeof(*mmie) - 2) | |
482 | return -1; | |
483 | ||
484 | return le16_to_cpu(mmie->key_id); | |
485 | } | |
486 | ||
487 | ||
33b64eb2 | 488 | static ieee80211_rx_result |
5cf121c3 | 489 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 490 | { |
a7767f95 HH |
491 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
492 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 493 | |
a7767f95 HH |
494 | if (ieee80211_is_data(hdr->frame_control)) { |
495 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
496 | return RX_DROP_MONITOR; |
497 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
498 | return RX_DROP_MONITOR; | |
499 | } | |
500 | ||
501 | /* If there is not an established peer link and this is not a peer link | |
502 | * establisment frame, beacon or probe, drop the frame. | |
503 | */ | |
504 | ||
b4e08ea1 | 505 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 506 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 507 | |
a7767f95 | 508 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
509 | return RX_DROP_MONITOR; |
510 | ||
a7767f95 | 511 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
512 | mgmt = (struct ieee80211_mgmt *)hdr; |
513 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
514 | return RX_DROP_MONITOR; | |
33b64eb2 | 515 | return RX_CONTINUE; |
33b64eb2 LCC |
516 | } |
517 | ||
a7767f95 HH |
518 | if (ieee80211_is_probe_req(hdr->frame_control) || |
519 | ieee80211_is_probe_resp(hdr->frame_control) || | |
520 | ieee80211_is_beacon(hdr->frame_control)) | |
521 | return RX_CONTINUE; | |
522 | ||
523 | return RX_DROP_MONITOR; | |
524 | ||
525 | } | |
526 | ||
527 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
528 | ||
529 | if (ieee80211_is_data(hdr->frame_control) && | |
530 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 531 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 532 | return RX_DROP_MONITOR; |
902acc78 | 533 | #undef msh_h_get |
d6d1a5a7 | 534 | |
902acc78 JB |
535 | return RX_CONTINUE; |
536 | } | |
33b64eb2 LCC |
537 | |
538 | ||
49461622 | 539 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 540 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 541 | { |
a7767f95 | 542 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
543 | |
544 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
545 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 546 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 547 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 548 | hdr->seq_ctrl)) { |
5cf121c3 | 549 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
550 | rx->local->dot11FrameDuplicateCount++; |
551 | rx->sta->num_duplicates++; | |
552 | } | |
e4c26add | 553 | return RX_DROP_MONITOR; |
571ecf67 | 554 | } else |
5cf121c3 | 555 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
556 | } |
557 | ||
571ecf67 JB |
558 | if (unlikely(rx->skb->len < 16)) { |
559 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 560 | return RX_DROP_MONITOR; |
571ecf67 JB |
561 | } |
562 | ||
571ecf67 JB |
563 | /* Drop disallowed frame classes based on STA auth/assoc state; |
564 | * IEEE 802.11, Chap 5.5. | |
565 | * | |
ccd7b362 JB |
566 | * mac80211 filters only based on association state, i.e. it drops |
567 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
568 | * deauth/disassoc frames when needed. In addition, hostapd is |
569 | * responsible for filtering on both auth and assoc states. | |
570 | */ | |
33b64eb2 | 571 | |
902acc78 | 572 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 573 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 574 | |
a7767f95 HH |
575 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
576 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 577 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 578 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
579 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
580 | !ieee80211_has_tods(hdr->frame_control) && | |
581 | ieee80211_is_data(hdr->frame_control)) || | |
582 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
583 | /* Drop IBSS frames and frames for other hosts |
584 | * silently. */ | |
e4c26add | 585 | return RX_DROP_MONITOR; |
571ecf67 JB |
586 | } |
587 | ||
e4c26add | 588 | return RX_DROP_MONITOR; |
571ecf67 JB |
589 | } |
590 | ||
9ae54c84 | 591 | return RX_CONTINUE; |
570bd537 JB |
592 | } |
593 | ||
594 | ||
49461622 | 595 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 596 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 597 | { |
a7767f95 | 598 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
599 | int keyidx; |
600 | int hdrlen; | |
e4c26add | 601 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 602 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 603 | int mmie_keyidx = -1; |
570bd537 | 604 | |
3017b80b JB |
605 | /* |
606 | * Key selection 101 | |
607 | * | |
3cfcf6ac | 608 | * There are four types of keys: |
3017b80b | 609 | * - GTK (group keys) |
3cfcf6ac | 610 | * - IGTK (group keys for management frames) |
3017b80b JB |
611 | * - PTK (pairwise keys) |
612 | * - STK (station-to-station pairwise keys) | |
613 | * | |
614 | * When selecting a key, we have to distinguish between multicast | |
615 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
616 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
617 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
618 | * unicast frames can also use key indices like GTKs. Hence, if we | |
619 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 620 | * |
8dc06a1c JB |
621 | * Note that in a regular BSS, multicast frames are sent by the |
622 | * AP only, associated stations unicast the frame to the AP first | |
623 | * which then multicasts it on their behalf. | |
624 | * | |
3017b80b JB |
625 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
626 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
627 | * The spec seems to expect that one negotiates the same key with |
628 | * every station but there's no such requirement; VLANs could be | |
629 | * possible. | |
3017b80b JB |
630 | */ |
631 | ||
3cfcf6ac JM |
632 | if (!ieee80211_has_protected(hdr->frame_control)) { |
633 | if (!ieee80211_is_mgmt(hdr->frame_control) || | |
634 | rx->sta == NULL || !test_sta_flags(rx->sta, WLAN_STA_MFP)) | |
635 | return RX_CONTINUE; | |
636 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
637 | if (mmie_keyidx < 0) | |
638 | return RX_CONTINUE; | |
639 | } | |
571ecf67 | 640 | |
3017b80b | 641 | /* |
1990af8d | 642 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
643 | * addressed to us nor a multicast frame. |
644 | */ | |
5cf121c3 | 645 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 646 | return RX_CONTINUE; |
3017b80b | 647 | |
d4e46a3d JB |
648 | if (rx->sta) |
649 | stakey = rcu_dereference(rx->sta->key); | |
650 | ||
651 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
652 | rx->key = stakey; | |
3cfcf6ac JM |
653 | } else if (mmie_keyidx >= 0) { |
654 | /* Broadcast/multicast robust management frame / BIP */ | |
655 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && | |
656 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
657 | return RX_CONTINUE; | |
658 | ||
659 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
660 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
661 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
662 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
571ecf67 | 663 | } else { |
3017b80b JB |
664 | /* |
665 | * The device doesn't give us the IV so we won't be | |
666 | * able to look up the key. That's ok though, we | |
667 | * don't need to decrypt the frame, we just won't | |
668 | * be able to keep statistics accurate. | |
669 | * Except for key threshold notifications, should | |
670 | * we somehow allow the driver to tell us which key | |
671 | * the hardware used if this flag is set? | |
672 | */ | |
5cf121c3 JB |
673 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
674 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 675 | return RX_CONTINUE; |
3017b80b | 676 | |
a7767f95 | 677 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
678 | |
679 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 680 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
681 | |
682 | /* | |
683 | * no need to call ieee80211_wep_get_keyidx, | |
684 | * it verifies a bunch of things we've done already | |
685 | */ | |
686 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
687 | ||
d4e46a3d | 688 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
689 | |
690 | /* | |
691 | * RSNA-protected unicast frames should always be sent with | |
692 | * pairwise or station-to-station keys, but for WEP we allow | |
693 | * using a key index as well. | |
694 | */ | |
8f20fc24 | 695 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
696 | !is_multicast_ether_addr(hdr->addr1)) |
697 | rx->key = NULL; | |
571ecf67 JB |
698 | } |
699 | ||
3017b80b | 700 | if (rx->key) { |
571ecf67 | 701 | rx->key->tx_rx_count++; |
011bfcc4 | 702 | /* TODO: add threshold stuff again */ |
1990af8d | 703 | } else { |
e4c26add | 704 | return RX_DROP_MONITOR; |
70f08765 JB |
705 | } |
706 | ||
1990af8d JB |
707 | /* Check for weak IVs if possible */ |
708 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 709 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
710 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
711 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
712 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
713 | rx->sta->wep_weak_iv_count++; | |
714 | ||
70f08765 JB |
715 | switch (rx->key->conf.alg) { |
716 | case ALG_WEP: | |
e2f036da MN |
717 | result = ieee80211_crypto_wep_decrypt(rx); |
718 | break; | |
70f08765 | 719 | case ALG_TKIP: |
e2f036da MN |
720 | result = ieee80211_crypto_tkip_decrypt(rx); |
721 | break; | |
70f08765 | 722 | case ALG_CCMP: |
e2f036da MN |
723 | result = ieee80211_crypto_ccmp_decrypt(rx); |
724 | break; | |
3cfcf6ac JM |
725 | case ALG_AES_CMAC: |
726 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
727 | break; | |
70f08765 JB |
728 | } |
729 | ||
e2f036da | 730 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 731 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
732 | |
733 | return result; | |
70f08765 JB |
734 | } |
735 | ||
572e0012 KV |
736 | static ieee80211_rx_result debug_noinline |
737 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
738 | { | |
739 | struct ieee80211_local *local; | |
740 | struct ieee80211_hdr *hdr; | |
741 | struct sk_buff *skb; | |
742 | ||
743 | local = rx->local; | |
744 | skb = rx->skb; | |
745 | hdr = (struct ieee80211_hdr *) skb->data; | |
746 | ||
747 | if (!local->pspolling) | |
748 | return RX_CONTINUE; | |
749 | ||
750 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
751 | /* this is not from AP */ | |
752 | return RX_CONTINUE; | |
753 | ||
754 | if (!ieee80211_is_data(hdr->frame_control)) | |
755 | return RX_CONTINUE; | |
756 | ||
757 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
758 | /* AP has no more frames buffered for us */ | |
759 | local->pspolling = false; | |
760 | return RX_CONTINUE; | |
761 | } | |
762 | ||
763 | /* more data bit is set, let's request a new frame from the AP */ | |
764 | ieee80211_send_pspoll(local, rx->sdata); | |
765 | ||
766 | return RX_CONTINUE; | |
767 | } | |
768 | ||
133b8226 | 769 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 770 | { |
133b8226 | 771 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 772 | struct ieee80211_local *local = sdata->local; |
0795af57 | 773 | |
3e122be0 | 774 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 775 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
89fad578 CL |
776 | if (local->ops->sta_notify) |
777 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
778 | STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 779 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
780 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
781 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
782 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
783 | } | |
784 | ||
133b8226 | 785 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 786 | { |
133b8226 JB |
787 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
788 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
789 | struct sk_buff *skb; |
790 | int sent = 0; | |
571ecf67 | 791 | |
3e122be0 | 792 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 793 | |
07346f81 | 794 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
89fad578 CL |
795 | if (local->ops->sta_notify) |
796 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
797 | STA_NOTIFY_AWAKE, &sta->sta); | |
004c872e JB |
798 | |
799 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
800 | sta_info_clear_tim_bit(sta); | |
801 | ||
571ecf67 | 802 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
803 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
804 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 805 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 806 | |
571ecf67 JB |
807 | /* Send all buffered frames to the station */ |
808 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 809 | sent++; |
8b30b1fe | 810 | skb->requeue = 1; |
571ecf67 JB |
811 | dev_queue_xmit(skb); |
812 | } | |
813 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
814 | local->total_ps_buffered--; |
815 | sent++; | |
816 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 817 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 818 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 819 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 820 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 821 | skb->requeue = 1; |
571ecf67 JB |
822 | dev_queue_xmit(skb); |
823 | } | |
824 | ||
825 | return sent; | |
826 | } | |
827 | ||
49461622 | 828 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 829 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
830 | { |
831 | struct sta_info *sta = rx->sta; | |
a7767f95 | 832 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
833 | |
834 | if (!sta) | |
9ae54c84 | 835 | return RX_CONTINUE; |
571ecf67 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 where | |
839 | * other STAs are using different BSSID. */ | |
05c914fe | 840 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 841 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 842 | NL80211_IFTYPE_ADHOC); |
46900298 | 843 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 JB |
844 | sta->last_rx = jiffies; |
845 | } else | |
846 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 847 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
848 | /* Update last_rx only for unicast frames in order to prevent |
849 | * the Probe Request frames (the only broadcast frames from a | |
850 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
851 | * Mesh beacons will update last_rx when if they are found to |
852 | * match the current local configuration when processed. | |
571ecf67 | 853 | */ |
15b7b062 KV |
854 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION && |
855 | ieee80211_is_beacon(hdr->frame_control)) { | |
856 | rx->sdata->u.mgd.last_beacon = jiffies; | |
857 | } else | |
858 | sta->last_rx = jiffies; | |
571ecf67 JB |
859 | } |
860 | ||
5cf121c3 | 861 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 862 | return RX_CONTINUE; |
571ecf67 | 863 | |
3cf335d5 KV |
864 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
865 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
866 | ||
571ecf67 JB |
867 | sta->rx_fragments++; |
868 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 869 | sta->last_signal = rx->status->signal; |
566bfe5a | 870 | sta->last_qual = rx->status->qual; |
5cf121c3 | 871 | sta->last_noise = rx->status->noise; |
571ecf67 | 872 | |
72eaa43a JB |
873 | /* |
874 | * Change STA power saving mode only at the end of a frame | |
875 | * exchange sequence. | |
876 | */ | |
3e122be0 | 877 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
878 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
879 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
880 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
881 | /* | |
882 | * Ignore doze->wake transitions that are | |
883 | * indicated by non-data frames, the standard | |
884 | * is unclear here, but for example going to | |
885 | * PS mode and then scanning would cause a | |
886 | * doze->wake transition for the probe request, | |
887 | * and that is clearly undesirable. | |
888 | */ | |
889 | if (ieee80211_is_data(hdr->frame_control) && | |
890 | !ieee80211_has_pm(hdr->frame_control)) | |
891 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
892 | } else { | |
893 | if (ieee80211_has_pm(hdr->frame_control)) | |
894 | ap_sta_ps_start(sta); | |
895 | } | |
571ecf67 JB |
896 | } |
897 | ||
898 | /* Drop data::nullfunc frames silently, since they are used only to | |
899 | * control station power saving mode. */ | |
a7767f95 | 900 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
901 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
902 | /* Update counter and free packet here to avoid counting this | |
903 | * as a dropped packed. */ | |
904 | sta->rx_packets++; | |
905 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 906 | return RX_QUEUED; |
571ecf67 JB |
907 | } |
908 | ||
9ae54c84 | 909 | return RX_CONTINUE; |
571ecf67 JB |
910 | } /* ieee80211_rx_h_sta_process */ |
911 | ||
571ecf67 JB |
912 | static inline struct ieee80211_fragment_entry * |
913 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
914 | unsigned int frag, unsigned int seq, int rx_queue, | |
915 | struct sk_buff **skb) | |
916 | { | |
917 | struct ieee80211_fragment_entry *entry; | |
918 | int idx; | |
919 | ||
920 | idx = sdata->fragment_next; | |
921 | entry = &sdata->fragments[sdata->fragment_next++]; | |
922 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
923 | sdata->fragment_next = 0; | |
924 | ||
925 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 926 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
927 | struct ieee80211_hdr *hdr = |
928 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
929 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
930 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 931 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
932 | sdata->dev->name, idx, |
933 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 934 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 935 | #endif |
571ecf67 JB |
936 | __skb_queue_purge(&entry->skb_list); |
937 | } | |
938 | ||
939 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
940 | *skb = NULL; | |
941 | entry->first_frag_time = jiffies; | |
942 | entry->seq = seq; | |
943 | entry->rx_queue = rx_queue; | |
944 | entry->last_frag = frag; | |
945 | entry->ccmp = 0; | |
946 | entry->extra_len = 0; | |
947 | ||
948 | return entry; | |
949 | } | |
950 | ||
951 | static inline struct ieee80211_fragment_entry * | |
952 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 953 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
954 | int rx_queue, struct ieee80211_hdr *hdr) |
955 | { | |
956 | struct ieee80211_fragment_entry *entry; | |
957 | int i, idx; | |
958 | ||
959 | idx = sdata->fragment_next; | |
960 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
961 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
962 | |
963 | idx--; | |
964 | if (idx < 0) | |
965 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
966 | ||
967 | entry = &sdata->fragments[idx]; | |
968 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
969 | entry->rx_queue != rx_queue || | |
970 | entry->last_frag + 1 != frag) | |
971 | continue; | |
972 | ||
b73d70ad | 973 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 974 | |
b73d70ad HH |
975 | /* |
976 | * Check ftype and addresses are equal, else check next fragment | |
977 | */ | |
978 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
979 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
980 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
981 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
982 | continue; | |
983 | ||
ab46623e | 984 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
985 | __skb_queue_purge(&entry->skb_list); |
986 | continue; | |
987 | } | |
988 | return entry; | |
989 | } | |
990 | ||
991 | return NULL; | |
992 | } | |
993 | ||
49461622 | 994 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 995 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
996 | { |
997 | struct ieee80211_hdr *hdr; | |
998 | u16 sc; | |
358c8d9d | 999 | __le16 fc; |
571ecf67 JB |
1000 | unsigned int frag, seq; |
1001 | struct ieee80211_fragment_entry *entry; | |
1002 | struct sk_buff *skb; | |
1003 | ||
b73d70ad | 1004 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1005 | fc = hdr->frame_control; |
571ecf67 JB |
1006 | sc = le16_to_cpu(hdr->seq_ctrl); |
1007 | frag = sc & IEEE80211_SCTL_FRAG; | |
1008 | ||
358c8d9d | 1009 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1010 | (rx->skb)->len < 24 || |
1011 | is_multicast_ether_addr(hdr->addr1))) { | |
1012 | /* not fragmented */ | |
1013 | goto out; | |
1014 | } | |
1015 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1016 | ||
1017 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1018 | ||
1019 | if (frag == 0) { | |
1020 | /* This is the first fragment of a new frame. */ | |
1021 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1022 | rx->queue, &(rx->skb)); |
8f20fc24 | 1023 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1024 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1025 | /* Store CCMP PN so that we can verify that the next |
1026 | * fragment has a sequential PN value. */ | |
1027 | entry->ccmp = 1; | |
1028 | memcpy(entry->last_pn, | |
5cf121c3 | 1029 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1030 | CCMP_PN_LEN); |
1031 | } | |
9ae54c84 | 1032 | return RX_QUEUED; |
571ecf67 JB |
1033 | } |
1034 | ||
1035 | /* This is a fragment for a frame that should already be pending in | |
1036 | * fragment cache. Add this fragment to the end of the pending entry. | |
1037 | */ | |
b73d70ad | 1038 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1039 | if (!entry) { |
1040 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1041 | return RX_DROP_MONITOR; |
571ecf67 JB |
1042 | } |
1043 | ||
1044 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1045 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1046 | if (entry->ccmp) { | |
1047 | int i; | |
1048 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1049 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1050 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1051 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1052 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1053 | pn[i]++; | |
1054 | if (pn[i]) | |
1055 | break; | |
1056 | } | |
5cf121c3 | 1057 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1058 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1059 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1060 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1061 | } | |
1062 | ||
358c8d9d | 1063 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1064 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1065 | entry->last_frag = frag; | |
1066 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1067 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1068 | rx->skb = NULL; |
9ae54c84 | 1069 | return RX_QUEUED; |
571ecf67 JB |
1070 | } |
1071 | ||
1072 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1073 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1074 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1075 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1076 | GFP_ATOMIC))) { | |
1077 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1078 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1079 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1080 | } |
1081 | } | |
1082 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1083 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1084 | dev_kfree_skb(skb); | |
1085 | } | |
1086 | ||
1087 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1088 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1089 | |
1090 | out: | |
1091 | if (rx->sta) | |
1092 | rx->sta->rx_packets++; | |
1093 | if (is_multicast_ether_addr(hdr->addr1)) | |
1094 | rx->local->dot11MulticastReceivedFrameCount++; | |
1095 | else | |
1096 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1097 | return RX_CONTINUE; |
571ecf67 JB |
1098 | } |
1099 | ||
49461622 | 1100 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1101 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1102 | { |
98f0b0a3 | 1103 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1104 | struct sk_buff *skb; |
1105 | int no_pending_pkts; | |
358c8d9d | 1106 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1107 | |
358c8d9d | 1108 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1109 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1110 | return RX_CONTINUE; |
571ecf67 | 1111 | |
05c914fe JB |
1112 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1113 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1114 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1115 | |
571ecf67 JB |
1116 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1117 | if (!skb) { | |
1118 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1119 | if (skb) | |
1120 | rx->local->total_ps_buffered--; | |
1121 | } | |
1122 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1123 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1124 | ||
1125 | if (skb) { | |
1126 | struct ieee80211_hdr *hdr = | |
1127 | (struct ieee80211_hdr *) skb->data; | |
1128 | ||
4a9a66e9 JB |
1129 | /* |
1130 | * Tell TX path to send one frame even though the STA may | |
1131 | * still remain is PS mode after this frame exchange. | |
1132 | */ | |
07346f81 | 1133 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1134 | |
1135 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1136 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1137 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1138 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1139 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1140 | ||
1141 | /* Use MoreData flag to indicate whether there are more | |
1142 | * buffered frames for this STA */ | |
836341a7 | 1143 | if (no_pending_pkts) |
571ecf67 | 1144 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1145 | else |
571ecf67 JB |
1146 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1147 | ||
1148 | dev_queue_xmit(skb); | |
1149 | ||
004c872e JB |
1150 | if (no_pending_pkts) |
1151 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1152 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1153 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1154 | /* |
1155 | * FIXME: This can be the result of a race condition between | |
1156 | * us expiring a frame and the station polling for it. | |
1157 | * Should we send it a null-func frame indicating we | |
1158 | * have nothing buffered for it? | |
1159 | */ | |
0c68ae26 | 1160 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1161 | "though there are no buffered frames for it\n", |
0c68ae26 | 1162 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1163 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1164 | } |
1165 | ||
9ae54c84 | 1166 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1167 | * count as an dropped frame. */ |
1168 | dev_kfree_skb(rx->skb); | |
1169 | ||
9ae54c84 | 1170 | return RX_QUEUED; |
571ecf67 JB |
1171 | } |
1172 | ||
49461622 | 1173 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1174 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1175 | { |
6e0d114d | 1176 | u8 *data = rx->skb->data; |
238f74a2 | 1177 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1178 | |
238f74a2 | 1179 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1180 | return RX_CONTINUE; |
6e0d114d JB |
1181 | |
1182 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1183 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1184 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1185 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1186 | /* change frame type to non QOS */ |
238f74a2 | 1187 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1188 | |
9ae54c84 | 1189 | return RX_CONTINUE; |
6e0d114d JB |
1190 | } |
1191 | ||
76ee65bf | 1192 | static int |
5cf121c3 | 1193 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1194 | { |
07346f81 | 1195 | if (unlikely(!rx->sta || |
f4ea83dd | 1196 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1197 | return -EACCES; |
571ecf67 | 1198 | |
76ee65bf | 1199 | return 0; |
571ecf67 JB |
1200 | } |
1201 | ||
76ee65bf | 1202 | static int |
358c8d9d | 1203 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1204 | { |
3017b80b | 1205 | /* |
7848ba7d JB |
1206 | * Pass through unencrypted frames if the hardware has |
1207 | * decrypted them already. | |
3017b80b | 1208 | */ |
5cf121c3 | 1209 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1210 | return 0; |
571ecf67 JB |
1211 | |
1212 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1213 | if (unlikely(!ieee80211_has_protected(fc) && |
1214 | !ieee80211_is_nullfunc(fc) && | |
3cfcf6ac JM |
1215 | (!ieee80211_is_mgmt(fc) || |
1216 | (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1217 | rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) && | |
1218 | (rx->key || rx->sdata->drop_unencrypted))) | |
1219 | return -EACCES; | |
1220 | /* BIP does not use Protected field, so need to check MMIE */ | |
1221 | if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) && | |
1222 | ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && | |
1223 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
b3fc9c6c | 1224 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1225 | return -EACCES; |
b3fc9c6c | 1226 | |
76ee65bf | 1227 | return 0; |
571ecf67 JB |
1228 | } |
1229 | ||
76ee65bf | 1230 | static int |
5cf121c3 | 1231 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1232 | { |
1233 | struct net_device *dev = rx->dev; | |
571ecf67 | 1234 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1235 | u16 hdrlen, ethertype; |
571ecf67 JB |
1236 | u8 *payload; |
1237 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1238 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1239 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1240 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1241 | ||
b73d70ad | 1242 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1243 | return -1; |
571ecf67 | 1244 | |
b73d70ad | 1245 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1246 | |
1247 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1248 | * header | |
1249 | * IEEE 802.11 address fields: | |
1250 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1251 | * 0 0 DA SA BSSID n/a | |
1252 | * 0 1 DA BSSID SA n/a | |
1253 | * 1 0 BSSID SA DA n/a | |
1254 | * 1 1 RA TA DA SA | |
1255 | */ | |
b73d70ad HH |
1256 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1257 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1258 | |
b73d70ad HH |
1259 | switch (hdr->frame_control & |
1260 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
c1b4aa3f | 1261 | case cpu_to_le16(IEEE80211_FCTL_TODS): |
05c914fe JB |
1262 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1263 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1264 | return -1; |
571ecf67 | 1265 | break; |
c1b4aa3f | 1266 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1267 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1268 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1269 | return -1; |
79617dee Y |
1270 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1271 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1272 | (skb->data + hdrlen); | |
1273 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1274 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1275 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1276 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1277 | } | |
1278 | } | |
571ecf67 | 1279 | break; |
c1b4aa3f | 1280 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1281 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1282 | (is_multicast_ether_addr(dst) && |
1283 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1284 | return -1; |
571ecf67 | 1285 | break; |
c1b4aa3f | 1286 | case cpu_to_le16(0): |
05c914fe | 1287 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1288 | return -1; |
571ecf67 JB |
1289 | break; |
1290 | } | |
1291 | ||
f4ea83dd | 1292 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1293 | return -1; |
571ecf67 | 1294 | |
76ee65bf | 1295 | payload = skb->data + hdrlen; |
571ecf67 JB |
1296 | ethertype = (payload[6] << 8) | payload[7]; |
1297 | ||
1298 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1299 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1300 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1301 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1302 | * replace EtherType */ | |
1303 | skb_pull(skb, hdrlen + 6); | |
1304 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1305 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1306 | } else { | |
1307 | struct ethhdr *ehdr; | |
1308 | __be16 len; | |
ce3edf6d | 1309 | |
571ecf67 JB |
1310 | skb_pull(skb, hdrlen); |
1311 | len = htons(skb->len); | |
1312 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1313 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1314 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1315 | ehdr->h_proto = len; | |
1316 | } | |
76ee65bf RR |
1317 | return 0; |
1318 | } | |
571ecf67 | 1319 | |
ce3edf6d JB |
1320 | /* |
1321 | * requires that rx->skb is a frame with ethernet header | |
1322 | */ | |
358c8d9d | 1323 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1324 | { |
c97c23e3 | 1325 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1326 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1327 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1328 | ||
1329 | /* | |
1330 | * Allow EAPOL frames to us/the PAE group address regardless | |
1331 | * of whether the frame was encrypted or not. | |
1332 | */ | |
1333 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1334 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1335 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1336 | return true; | |
1337 | ||
1338 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1339 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1340 | return false; |
1341 | ||
1342 | return true; | |
1343 | } | |
1344 | ||
1345 | /* | |
1346 | * requires that rx->skb is a frame with ethernet header | |
1347 | */ | |
76ee65bf | 1348 | static void |
5cf121c3 | 1349 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1350 | { |
1351 | struct net_device *dev = rx->dev; | |
1352 | struct ieee80211_local *local = rx->local; | |
1353 | struct sk_buff *skb, *xmit_skb; | |
1354 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1355 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1356 | struct sta_info *dsta; | |
571ecf67 | 1357 | |
76ee65bf RR |
1358 | skb = rx->skb; |
1359 | xmit_skb = NULL; | |
571ecf67 | 1360 | |
05c914fe JB |
1361 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1362 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1363 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1364 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1365 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1366 | /* | |
1367 | * send multicast frames both to higher layers in | |
1368 | * local net stack and back to the wireless medium | |
1369 | */ | |
76ee65bf RR |
1370 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1371 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1372 | printk(KERN_DEBUG "%s: failed to clone " |
1373 | "multicast frame\n", dev->name); | |
1374 | } else { | |
571ecf67 | 1375 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1376 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1377 | /* |
1378 | * The destination station is associated to | |
1379 | * this AP (in this VLAN), so send the frame | |
1380 | * directly to it and do not pass it to local | |
1381 | * net stack. | |
571ecf67 | 1382 | */ |
76ee65bf | 1383 | xmit_skb = skb; |
571ecf67 JB |
1384 | skb = NULL; |
1385 | } | |
571ecf67 JB |
1386 | } |
1387 | } | |
1388 | ||
1389 | if (skb) { | |
d1c3a37c JB |
1390 | int align __maybe_unused; |
1391 | ||
1392 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1393 | /* | |
1394 | * 'align' will only take the values 0 or 2 here | |
1395 | * since all frames are required to be aligned | |
1396 | * to 2-byte boundaries when being passed to | |
1397 | * mac80211. That also explains the __skb_push() | |
1398 | * below. | |
1399 | */ | |
d1bcb9f1 | 1400 | align = (unsigned long)skb->data & 3; |
d1c3a37c JB |
1401 | if (align) { |
1402 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1403 | dev_kfree_skb(skb); | |
1404 | skb = NULL; | |
1405 | } else { | |
1406 | u8 *data = skb->data; | |
1407 | size_t len = skb->len; | |
1408 | u8 *new = __skb_push(skb, align); | |
1409 | memmove(new, data, len); | |
1410 | __skb_trim(skb, len); | |
1411 | } | |
1412 | } | |
1413 | #endif | |
1414 | ||
1415 | if (skb) { | |
1416 | /* deliver to local stack */ | |
1417 | skb->protocol = eth_type_trans(skb, dev); | |
1418 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1419 | netif_rx(skb); | |
1420 | } | |
571ecf67 JB |
1421 | } |
1422 | ||
76ee65bf | 1423 | if (xmit_skb) { |
571ecf67 | 1424 | /* send to wireless media */ |
f831e909 | 1425 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1426 | skb_reset_network_header(xmit_skb); |
1427 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1428 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1429 | } |
76ee65bf RR |
1430 | } |
1431 | ||
49461622 | 1432 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1433 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1434 | { |
1435 | struct net_device *dev = rx->dev; | |
1436 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1437 | u16 ethertype; |
fd4c7f2f RR |
1438 | u8 *payload; |
1439 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1440 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1441 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1442 | const struct ethhdr *eth; |
1443 | int remaining, err; | |
1444 | u8 dst[ETH_ALEN]; | |
1445 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1446 | |
358c8d9d | 1447 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1448 | return RX_CONTINUE; |
fd4c7f2f | 1449 | |
358c8d9d | 1450 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1451 | return RX_DROP_MONITOR; |
fd4c7f2f | 1452 | |
5cf121c3 | 1453 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1454 | return RX_CONTINUE; |
fd4c7f2f RR |
1455 | |
1456 | err = ieee80211_data_to_8023(rx); | |
1457 | if (unlikely(err)) | |
e4c26add | 1458 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1459 | |
1460 | skb->dev = dev; | |
1461 | ||
1462 | dev->stats.rx_packets++; | |
1463 | dev->stats.rx_bytes += skb->len; | |
1464 | ||
1465 | /* skip the wrapping header */ | |
1466 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1467 | if (!eth) | |
e4c26add | 1468 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1469 | |
1470 | while (skb != frame) { | |
1471 | u8 padding; | |
1472 | __be16 len = eth->h_proto; | |
1473 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1474 | ||
1475 | remaining = skb->len; | |
1476 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1477 | memcpy(src, eth->h_source, ETH_ALEN); | |
1478 | ||
1479 | padding = ((4 - subframe_len) & 0x3); | |
1480 | /* the last MSDU has no padding */ | |
f4ea83dd | 1481 | if (subframe_len > remaining) |
e4c26add | 1482 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1483 | |
1484 | skb_pull(skb, sizeof(struct ethhdr)); | |
1485 | /* if last subframe reuse skb */ | |
1486 | if (remaining <= subframe_len + padding) | |
1487 | frame = skb; | |
1488 | else { | |
d1c3a37c JB |
1489 | /* |
1490 | * Allocate and reserve two bytes more for payload | |
1491 | * alignment since sizeof(struct ethhdr) is 14. | |
1492 | */ | |
1493 | frame = dev_alloc_skb( | |
1494 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1495 | subframe_len + 2); | |
fd4c7f2f RR |
1496 | |
1497 | if (frame == NULL) | |
e4c26add | 1498 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1499 | |
d1c3a37c JB |
1500 | skb_reserve(frame, |
1501 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1502 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1503 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1504 | ntohs(len)); | |
1505 | ||
1506 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1507 | padding); | |
1508 | if (!eth) { | |
fd4c7f2f | 1509 | dev_kfree_skb(frame); |
e4c26add | 1510 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1511 | } |
1512 | } | |
1513 | ||
ce3edf6d | 1514 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1515 | frame->dev = dev; |
1516 | frame->priority = skb->priority; | |
1517 | rx->skb = frame; | |
1518 | ||
fd4c7f2f RR |
1519 | payload = frame->data; |
1520 | ethertype = (payload[6] << 8) | payload[7]; | |
1521 | ||
1522 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1523 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1524 | compare_ether_addr(payload, | |
1525 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1526 | /* remove RFC1042 or Bridge-Tunnel |
1527 | * encapsulation and replace EtherType */ | |
1528 | skb_pull(frame, 6); | |
1529 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1530 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1531 | } else { | |
ce3edf6d JB |
1532 | memcpy(skb_push(frame, sizeof(__be16)), |
1533 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1534 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1535 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1536 | } | |
1537 | ||
358c8d9d | 1538 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1539 | if (skb == frame) /* last frame */ |
e4c26add | 1540 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1541 | dev_kfree_skb(frame); |
1542 | continue; | |
1543 | } | |
fd4c7f2f RR |
1544 | |
1545 | ieee80211_deliver_skb(rx); | |
1546 | } | |
1547 | ||
9ae54c84 | 1548 | return RX_QUEUED; |
fd4c7f2f RR |
1549 | } |
1550 | ||
bf94e17b | 1551 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1552 | static ieee80211_rx_result |
e32f85f7 LCC |
1553 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1554 | { | |
1555 | struct ieee80211_hdr *hdr; | |
1556 | struct ieee80211s_hdr *mesh_hdr; | |
1557 | unsigned int hdrlen; | |
1558 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1559 | ||
1560 | hdr = (struct ieee80211_hdr *) skb->data; | |
1561 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1562 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1563 | ||
1564 | if (!ieee80211_is_data(hdr->frame_control)) | |
1565 | return RX_CONTINUE; | |
1566 | ||
1567 | if (!mesh_hdr->ttl) | |
1568 | /* illegal frame */ | |
1569 | return RX_DROP_MONITOR; | |
1570 | ||
79617dee Y |
1571 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1572 | struct ieee80211_sub_if_data *sdata; | |
1573 | struct mesh_path *mppath; | |
1574 | ||
1575 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1576 | rcu_read_lock(); | |
1577 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1578 | if (!mppath) { | |
1579 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1580 | } else { | |
1581 | spin_lock_bh(&mppath->state_lock); | |
1582 | mppath->exp_time = jiffies; | |
1583 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1584 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1585 | spin_unlock_bh(&mppath->state_lock); | |
1586 | } | |
1587 | rcu_read_unlock(); | |
1588 | } | |
1589 | ||
e32f85f7 LCC |
1590 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1591 | return RX_CONTINUE; | |
1592 | ||
1593 | mesh_hdr->ttl--; | |
1594 | ||
1595 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1596 | if (!mesh_hdr->ttl) | |
472dbc45 | 1597 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1598 | dropped_frames_ttl); |
1599 | else { | |
1600 | struct ieee80211_hdr *fwd_hdr; | |
1601 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1602 | ||
1603 | if (!fwd_skb && net_ratelimit()) | |
1604 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1605 | rx->dev->name); | |
1606 | ||
1607 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1608 | /* | |
1609 | * Save TA to addr1 to send TA a path error if a | |
1610 | * suitable next hop is not found | |
1611 | */ | |
1612 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1613 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1614 | fwd_skb->dev = rx->local->mdev; | |
1615 | fwd_skb->iif = rx->dev->ifindex; | |
1616 | dev_queue_xmit(fwd_skb); | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | if (is_multicast_ether_addr(hdr->addr3) || | |
1621 | rx->dev->flags & IFF_PROMISC) | |
1622 | return RX_CONTINUE; | |
1623 | else | |
1624 | return RX_DROP_MONITOR; | |
1625 | } | |
bf94e17b | 1626 | #endif |
e32f85f7 | 1627 | |
49461622 | 1628 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1629 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1630 | { |
1631 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1632 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1633 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1634 | int err; |
76ee65bf | 1635 | |
358c8d9d | 1636 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1637 | return RX_CONTINUE; |
76ee65bf | 1638 | |
358c8d9d | 1639 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1640 | return RX_DROP_MONITOR; |
76ee65bf | 1641 | |
76ee65bf RR |
1642 | err = ieee80211_data_to_8023(rx); |
1643 | if (unlikely(err)) | |
e4c26add | 1644 | return RX_DROP_UNUSABLE; |
76ee65bf | 1645 | |
358c8d9d | 1646 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1647 | return RX_DROP_MONITOR; |
ce3edf6d | 1648 | |
76ee65bf RR |
1649 | rx->skb->dev = dev; |
1650 | ||
1651 | dev->stats.rx_packets++; | |
1652 | dev->stats.rx_bytes += rx->skb->len; | |
1653 | ||
1654 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1655 | |
9ae54c84 | 1656 | return RX_QUEUED; |
571ecf67 JB |
1657 | } |
1658 | ||
49461622 | 1659 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1660 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1661 | { |
1662 | struct ieee80211_local *local = rx->local; | |
1663 | struct ieee80211_hw *hw = &local->hw; | |
1664 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1665 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1666 | struct tid_ampdu_rx *tid_agg_rx; |
1667 | u16 start_seq_num; | |
1668 | u16 tid; | |
1669 | ||
a7767f95 | 1670 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1671 | return RX_CONTINUE; |
71364716 | 1672 | |
a7767f95 | 1673 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1674 | if (!rx->sta) |
9ae54c84 | 1675 | return RX_CONTINUE; |
71364716 | 1676 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1677 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1678 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1679 | return RX_CONTINUE; |
cee24a3e | 1680 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1681 | |
1682 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1683 | ||
1684 | /* reset session timer */ | |
20ad19d0 JB |
1685 | if (tid_agg_rx->timeout) |
1686 | mod_timer(&tid_agg_rx->session_timer, | |
1687 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1688 | |
1689 | /* manage reordering buffer according to requested */ | |
1690 | /* sequence number */ | |
1691 | rcu_read_lock(); | |
b3631286 | 1692 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, NULL, |
71364716 RR |
1693 | start_seq_num, 1); |
1694 | rcu_read_unlock(); | |
e4c26add | 1695 | return RX_DROP_UNUSABLE; |
71364716 RR |
1696 | } |
1697 | ||
9ae54c84 | 1698 | return RX_CONTINUE; |
71364716 RR |
1699 | } |
1700 | ||
f4f727a6 JM |
1701 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1702 | struct ieee80211_mgmt *mgmt, | |
1703 | size_t len) | |
fea14732 JM |
1704 | { |
1705 | struct ieee80211_local *local = sdata->local; | |
1706 | struct sk_buff *skb; | |
1707 | struct ieee80211_mgmt *resp; | |
1708 | ||
1709 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1710 | /* Not to own unicast address */ | |
1711 | return; | |
1712 | } | |
1713 | ||
46900298 JB |
1714 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1715 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
fea14732 JM |
1716 | /* Not from the current AP. */ |
1717 | return; | |
1718 | } | |
1719 | ||
46900298 | 1720 | if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) { |
fea14732 JM |
1721 | /* Association in progress; ignore SA Query */ |
1722 | return; | |
1723 | } | |
1724 | ||
1725 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1726 | /* Too short SA Query request frame */ | |
1727 | return; | |
1728 | } | |
1729 | ||
1730 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1731 | if (skb == NULL) | |
1732 | return; | |
1733 | ||
1734 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1735 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1736 | memset(resp, 0, 24); | |
1737 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1738 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1739 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1740 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1741 | IEEE80211_STYPE_ACTION); | |
1742 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1743 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1744 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1745 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1746 | mgmt->u.action.u.sa_query.trans_id, | |
1747 | WLAN_SA_QUERY_TR_ID_LEN); | |
1748 | ||
1749 | ieee80211_tx_skb(sdata, skb, 1); | |
1750 | } | |
1751 | ||
de1ede7a JB |
1752 | static ieee80211_rx_result debug_noinline |
1753 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1754 | { | |
1755 | struct ieee80211_local *local = rx->local; | |
1756 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1757 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
c481ec97 | 1758 | struct ieee80211_bss *bss; |
de1ede7a JB |
1759 | int len = rx->skb->len; |
1760 | ||
1761 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1762 | return RX_CONTINUE; | |
1763 | ||
1764 | if (!rx->sta) | |
1765 | return RX_DROP_MONITOR; | |
1766 | ||
1767 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1768 | return RX_DROP_MONITOR; | |
1769 | ||
97ebe12a JM |
1770 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1771 | return RX_DROP_MONITOR; | |
1772 | ||
de1ede7a JB |
1773 | /* all categories we currently handle have action_code */ |
1774 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1775 | return RX_DROP_MONITOR; | |
1776 | ||
de1ede7a JB |
1777 | switch (mgmt->u.action.category) { |
1778 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1779 | /* |
1780 | * The aggregation code is not prepared to handle | |
1781 | * anything but STA/AP due to the BSSID handling; | |
1782 | * IBSS could work in the code but isn't supported | |
1783 | * by drivers or the standard. | |
1784 | */ | |
1785 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1786 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1787 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1788 | return RX_DROP_MONITOR; | |
1789 | ||
de1ede7a JB |
1790 | switch (mgmt->u.action.u.addba_req.action_code) { |
1791 | case WLAN_ACTION_ADDBA_REQ: | |
1792 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1793 | sizeof(mgmt->u.action.u.addba_req))) | |
1794 | return RX_DROP_MONITOR; | |
1795 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1796 | break; | |
1797 | case WLAN_ACTION_ADDBA_RESP: | |
1798 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1799 | sizeof(mgmt->u.action.u.addba_resp))) | |
1800 | return RX_DROP_MONITOR; | |
1801 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1802 | break; | |
1803 | case WLAN_ACTION_DELBA: | |
1804 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1805 | sizeof(mgmt->u.action.u.delba))) | |
1806 | return RX_DROP_MONITOR; | |
1807 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1808 | break; | |
1809 | } | |
39192c0b JB |
1810 | break; |
1811 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1812 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1813 | return RX_DROP_MONITOR; | |
46900298 JB |
1814 | |
1815 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1816 | return RX_DROP_MONITOR; | |
1817 | ||
39192c0b JB |
1818 | switch (mgmt->u.action.u.measurement.action_code) { |
1819 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1820 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1821 | sizeof(mgmt->u.action.u.measurement))) | |
1822 | return RX_DROP_MONITOR; | |
1823 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1824 | break; | |
c481ec97 S |
1825 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1826 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1827 | sizeof(mgmt->u.action.u.chan_switch))) | |
1828 | return RX_DROP_MONITOR; | |
1829 | ||
46900298 | 1830 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1831 | return RX_DROP_MONITOR; |
1832 | ||
46900298 | 1833 | bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid, |
c481ec97 | 1834 | local->hw.conf.channel->center_freq, |
46900298 JB |
1835 | sdata->u.mgd.ssid, |
1836 | sdata->u.mgd.ssid_len); | |
c481ec97 S |
1837 | if (!bss) |
1838 | return RX_DROP_MONITOR; | |
1839 | ||
1840 | ieee80211_process_chanswitch(sdata, | |
1841 | &mgmt->u.action.u.chan_switch.sw_elem, bss); | |
1842 | ieee80211_rx_bss_put(local, bss); | |
1843 | break; | |
39192c0b JB |
1844 | } |
1845 | break; | |
fea14732 JM |
1846 | case WLAN_CATEGORY_SA_QUERY: |
1847 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1848 | sizeof(mgmt->u.action.u.sa_query))) | |
1849 | return RX_DROP_MONITOR; | |
1850 | switch (mgmt->u.action.u.sa_query.action) { | |
1851 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1852 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1853 | return RX_DROP_MONITOR; | |
1854 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1855 | break; | |
1856 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1857 | /* | |
1858 | * SA Query response is currently only used in AP mode | |
1859 | * and it is processed in user space. | |
1860 | */ | |
1861 | return RX_CONTINUE; | |
1862 | } | |
1863 | break; | |
39192c0b JB |
1864 | default: |
1865 | return RX_CONTINUE; | |
de1ede7a JB |
1866 | } |
1867 | ||
39192c0b JB |
1868 | rx->sta->rx_packets++; |
1869 | dev_kfree_skb(rx->skb); | |
1870 | return RX_QUEUED; | |
de1ede7a JB |
1871 | } |
1872 | ||
49461622 | 1873 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1874 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1875 | { |
759ef3eb | 1876 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1877 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1878 | |
5cf121c3 | 1879 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1880 | return RX_DROP_MONITOR; |
571ecf67 | 1881 | |
97ebe12a JM |
1882 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1883 | return RX_DROP_MONITOR; | |
1884 | ||
472dbc45 JB |
1885 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1886 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1887 | ||
3832c287 | 1888 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
7986cf95 | 1889 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status); |
f9d540ee | 1890 | |
7986cf95 | 1891 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
46900298 | 1892 | return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
46900298 | 1893 | |
7986cf95 | 1894 | return RX_DROP_MONITOR; |
571ecf67 JB |
1895 | } |
1896 | ||
571ecf67 JB |
1897 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1898 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1899 | struct ieee80211_rx_data *rx) |
571ecf67 | 1900 | { |
a7767f95 HH |
1901 | int keyidx; |
1902 | unsigned int hdrlen; | |
571ecf67 | 1903 | |
a7767f95 | 1904 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1905 | if (rx->skb->len >= hdrlen + 4) |
1906 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1907 | else | |
1908 | keyidx = -1; | |
1909 | ||
8944b79f | 1910 | if (!rx->sta) { |
aa0daf0e JB |
1911 | /* |
1912 | * Some hardware seem to generate incorrect Michael MIC | |
1913 | * reports; ignore them to avoid triggering countermeasures. | |
1914 | */ | |
571ecf67 JB |
1915 | goto ignore; |
1916 | } | |
1917 | ||
a7767f95 | 1918 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1919 | goto ignore; |
571ecf67 | 1920 | |
05c914fe | 1921 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1922 | /* |
1923 | * APs with pairwise keys should never receive Michael MIC | |
1924 | * errors for non-zero keyidx because these are reserved for | |
1925 | * group keys and only the AP is sending real multicast | |
1926 | * frames in the BSS. | |
1927 | */ | |
eb063c17 | 1928 | goto ignore; |
571ecf67 JB |
1929 | } |
1930 | ||
a7767f95 HH |
1931 | if (!ieee80211_is_data(hdr->frame_control) && |
1932 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1933 | goto ignore; |
571ecf67 | 1934 | |
f698d856 | 1935 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1936 | ignore: |
1937 | dev_kfree_skb(rx->skb); | |
1938 | rx->skb = NULL; | |
1939 | } | |
1940 | ||
5cf121c3 JB |
1941 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1942 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1943 | { |
1944 | struct ieee80211_sub_if_data *sdata; | |
1945 | struct ieee80211_local *local = rx->local; | |
1946 | struct ieee80211_rtap_hdr { | |
1947 | struct ieee80211_radiotap_header hdr; | |
1948 | u8 flags; | |
1949 | u8 rate; | |
1950 | __le16 chan_freq; | |
1951 | __le16 chan_flags; | |
1952 | } __attribute__ ((packed)) *rthdr; | |
1953 | struct sk_buff *skb = rx->skb, *skb2; | |
1954 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1955 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1956 | |
5cf121c3 | 1957 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1958 | goto out_free_skb; |
1959 | ||
1960 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1961 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1962 | goto out_free_skb; | |
1963 | ||
1964 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1965 | memset(rthdr, 0, sizeof(*rthdr)); | |
1966 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1967 | rthdr->hdr.it_present = | |
1968 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1969 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1970 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1971 | ||
5cf121c3 | 1972 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1973 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1974 | ||
1975 | if (status->band == IEEE80211_BAND_5GHZ) | |
1976 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1977 | IEEE80211_CHAN_5GHZ); | |
1978 | else | |
1979 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1980 | IEEE80211_CHAN_2GHZ); | |
1981 | ||
1982 | skb_set_mac_header(skb, 0); | |
1983 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1984 | skb->pkt_type = PACKET_OTHERHOST; | |
1985 | skb->protocol = htons(ETH_P_802_2); | |
1986 | ||
1987 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1988 | if (!netif_running(sdata->dev)) | |
1989 | continue; | |
1990 | ||
05c914fe | 1991 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1992 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1993 | continue; | |
1994 | ||
1995 | if (prev_dev) { | |
1996 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1997 | if (skb2) { | |
1998 | skb2->dev = prev_dev; | |
1999 | netif_rx(skb2); | |
2000 | } | |
2001 | } | |
2002 | ||
2003 | prev_dev = sdata->dev; | |
2004 | sdata->dev->stats.rx_packets++; | |
2005 | sdata->dev->stats.rx_bytes += skb->len; | |
2006 | } | |
2007 | ||
2008 | if (prev_dev) { | |
2009 | skb->dev = prev_dev; | |
2010 | netif_rx(skb); | |
2011 | skb = NULL; | |
2012 | } else | |
2013 | goto out_free_skb; | |
2014 | ||
5cf121c3 | 2015 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
2016 | return; |
2017 | ||
2018 | out_free_skb: | |
2019 | dev_kfree_skb(skb); | |
2020 | } | |
2021 | ||
571ecf67 | 2022 | |
8944b79f | 2023 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2024 | struct ieee80211_rx_data *rx, |
8944b79f | 2025 | struct sk_buff *skb) |
58905290 | 2026 | { |
58905290 JB |
2027 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2028 | ||
8944b79f JB |
2029 | rx->skb = skb; |
2030 | rx->sdata = sdata; | |
2031 | rx->dev = sdata->dev; | |
2032 | ||
e32f85f7 LCC |
2033 | #define CALL_RXH(rxh) \ |
2034 | do { \ | |
2035 | res = rxh(rx); \ | |
2036 | if (res != RX_CONTINUE) \ | |
2037 | goto rxh_done; \ | |
2038 | } while (0); | |
49461622 JB |
2039 | |
2040 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2041 | CALL_RXH(ieee80211_rx_h_check) | |
2042 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 2043 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
2044 | CALL_RXH(ieee80211_rx_h_sta_process) |
2045 | CALL_RXH(ieee80211_rx_h_defragment) | |
2046 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2047 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2048 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2049 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2050 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2051 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
2052 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2053 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2054 | #endif |
49461622 JB |
2055 | CALL_RXH(ieee80211_rx_h_data) |
2056 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 2057 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
2058 | CALL_RXH(ieee80211_rx_h_mgmt) |
2059 | ||
2060 | #undef CALL_RXH | |
2061 | ||
2062 | rxh_done: | |
58905290 JB |
2063 | switch (res) { |
2064 | case RX_DROP_MONITOR: | |
49461622 JB |
2065 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2066 | if (rx->sta) | |
2067 | rx->sta->rx_dropped++; | |
2068 | /* fall through */ | |
2069 | case RX_CONTINUE: | |
3d30d949 MW |
2070 | ieee80211_rx_cooked_monitor(rx); |
2071 | break; | |
58905290 | 2072 | case RX_DROP_UNUSABLE: |
49461622 JB |
2073 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2074 | if (rx->sta) | |
2075 | rx->sta->rx_dropped++; | |
58905290 JB |
2076 | dev_kfree_skb(rx->skb); |
2077 | break; | |
49461622 JB |
2078 | case RX_QUEUED: |
2079 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2080 | break; | |
58905290 JB |
2081 | } |
2082 | } | |
2083 | ||
571ecf67 JB |
2084 | /* main receive path */ |
2085 | ||
23a24def | 2086 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2087 | struct ieee80211_rx_data *rx, |
23a24def JB |
2088 | struct ieee80211_hdr *hdr) |
2089 | { | |
7ab17c45 | 2090 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2091 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2092 | ||
51fb61e7 | 2093 | switch (sdata->vif.type) { |
05c914fe | 2094 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2095 | if (!bssid) |
2096 | return 0; | |
46900298 | 2097 | if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) { |
5cf121c3 | 2098 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2099 | return 0; |
5cf121c3 | 2100 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2101 | } else if (!multicast && |
2102 | compare_ether_addr(sdata->dev->dev_addr, | |
2103 | hdr->addr1) != 0) { | |
4150c572 | 2104 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2105 | return 0; |
5cf121c3 | 2106 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2107 | } |
2108 | break; | |
05c914fe | 2109 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2110 | if (!bssid) |
2111 | return 0; | |
a7767f95 | 2112 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2113 | return 1; |
87291c02 | 2114 | } |
46900298 | 2115 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2116 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2117 | return 0; |
5cf121c3 | 2118 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2119 | } else if (!multicast && |
2120 | compare_ether_addr(sdata->dev->dev_addr, | |
2121 | hdr->addr1) != 0) { | |
4150c572 | 2122 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2123 | return 0; |
5cf121c3 | 2124 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2125 | } else if (!rx->sta) { |
2126 | int rate_idx; | |
2127 | if (rx->status->flag & RX_FLAG_HT) | |
2128 | rate_idx = 0; /* TODO: HT rates */ | |
2129 | else | |
2130 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2131 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2132 | BIT(rate_idx)); |
2133 | } | |
23a24def | 2134 | break; |
05c914fe | 2135 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2136 | if (!multicast && |
2137 | compare_ether_addr(sdata->dev->dev_addr, | |
2138 | hdr->addr1) != 0) { | |
2139 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2140 | return 0; | |
2141 | ||
5cf121c3 | 2142 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2143 | } |
2144 | break; | |
05c914fe JB |
2145 | case NL80211_IFTYPE_AP_VLAN: |
2146 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2147 | if (!bssid) { |
2148 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2149 | hdr->addr1)) | |
2150 | return 0; | |
2151 | } else if (!ieee80211_bssid_match(bssid, | |
2152 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2153 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2154 | return 0; |
5cf121c3 | 2155 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2156 | } |
23a24def | 2157 | break; |
05c914fe | 2158 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2159 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2160 | return 0; |
2161 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2162 | return 0; | |
2163 | break; | |
05c914fe | 2164 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2165 | /* take everything */ |
2166 | break; | |
05c914fe JB |
2167 | case NL80211_IFTYPE_UNSPECIFIED: |
2168 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2169 | /* should never get here */ |
2170 | WARN_ON(1); | |
2171 | break; | |
23a24def JB |
2172 | } |
2173 | ||
2174 | return 1; | |
2175 | } | |
2176 | ||
571ecf67 | 2177 | /* |
6368e4b1 RR |
2178 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2179 | * be called with rcu_read_lock protection. | |
571ecf67 | 2180 | */ |
71ebb4aa RR |
2181 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2182 | struct sk_buff *skb, | |
2183 | struct ieee80211_rx_status *status, | |
8318d78a | 2184 | struct ieee80211_rate *rate) |
571ecf67 JB |
2185 | { |
2186 | struct ieee80211_local *local = hw_to_local(hw); | |
2187 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2188 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2189 | struct ieee80211_rx_data rx; |
6368e4b1 | 2190 | int prepares; |
8e6f0032 JB |
2191 | struct ieee80211_sub_if_data *prev = NULL; |
2192 | struct sk_buff *skb_new; | |
571ecf67 | 2193 | |
358c8d9d | 2194 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2195 | memset(&rx, 0, sizeof(rx)); |
2196 | rx.skb = skb; | |
2197 | rx.local = local; | |
2198 | ||
5cf121c3 | 2199 | rx.status = status; |
5cf121c3 | 2200 | rx.rate = rate; |
72abd81b | 2201 | |
358c8d9d | 2202 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2203 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2204 | |
8944b79f JB |
2205 | rx.sta = sta_info_get(local, hdr->addr2); |
2206 | if (rx.sta) { | |
d0709a65 JB |
2207 | rx.sdata = rx.sta->sdata; |
2208 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2209 | } |
571ecf67 | 2210 | |
571ecf67 | 2211 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2212 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2213 | return; |
571ecf67 JB |
2214 | } |
2215 | ||
c2b13452 | 2216 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2217 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2218 | |
38f3714d | 2219 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2220 | ieee80211_verify_alignment(&rx); |
38f3714d | 2221 | |
571ecf67 JB |
2222 | skb = rx.skb; |
2223 | ||
79010420 | 2224 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2225 | if (!netif_running(sdata->dev)) |
2226 | continue; | |
2227 | ||
05c914fe | 2228 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2229 | continue; |
2230 | ||
5cf121c3 | 2231 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2232 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2233 | |
6368e4b1 | 2234 | if (!prepares) |
23a24def | 2235 | continue; |
8e6f0032 | 2236 | |
340e11f3 JB |
2237 | /* |
2238 | * frame is destined for this interface, but if it's not | |
2239 | * also for the previous one we handle that after the | |
2240 | * loop to avoid copying the SKB once too much | |
2241 | */ | |
2242 | ||
2243 | if (!prev) { | |
2244 | prev = sdata; | |
2245 | continue; | |
8e6f0032 | 2246 | } |
340e11f3 JB |
2247 | |
2248 | /* | |
2249 | * frame was destined for the previous interface | |
2250 | * so invoke RX handlers for it | |
2251 | */ | |
2252 | ||
2253 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2254 | if (!skb_new) { | |
2255 | if (net_ratelimit()) | |
2256 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2257 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2258 | wiphy_name(local->hw.wiphy), |
2259 | prev->dev->name); | |
340e11f3 JB |
2260 | continue; |
2261 | } | |
8944b79f | 2262 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2263 | prev = sdata; |
571ecf67 | 2264 | } |
a4b7d7bd | 2265 | if (prev) |
8944b79f | 2266 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2267 | else |
8e6f0032 | 2268 | dev_kfree_skb(skb); |
571ecf67 | 2269 | } |
6368e4b1 | 2270 | |
b580781e RR |
2271 | #define SEQ_MODULO 0x1000 |
2272 | #define SEQ_MASK 0xfff | |
2273 | ||
2274 | static inline int seq_less(u16 sq1, u16 sq2) | |
2275 | { | |
c6a1fa12 | 2276 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2277 | } |
2278 | ||
2279 | static inline u16 seq_inc(u16 sq) | |
2280 | { | |
c6a1fa12 | 2281 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2282 | } |
2283 | ||
2284 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2285 | { | |
c6a1fa12 | 2286 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2287 | } |
2288 | ||
2289 | ||
71364716 RR |
2290 | /* |
2291 | * As it function blongs to Rx path it must be called with | |
2292 | * the proper rcu_read_lock protection for its flow. | |
2293 | */ | |
c6a1fa12 JB |
2294 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2295 | struct tid_ampdu_rx *tid_agg_rx, | |
2296 | struct sk_buff *skb, | |
b3631286 | 2297 | struct ieee80211_rx_status *rxstatus, |
c6a1fa12 JB |
2298 | u16 mpdu_seq_num, |
2299 | int bar_req) | |
b580781e RR |
2300 | { |
2301 | struct ieee80211_local *local = hw_to_local(hw); | |
2302 | struct ieee80211_rx_status status; | |
2303 | u16 head_seq_num, buf_size; | |
2304 | int index; | |
8318d78a JB |
2305 | struct ieee80211_supported_band *sband; |
2306 | struct ieee80211_rate *rate; | |
b580781e RR |
2307 | |
2308 | buf_size = tid_agg_rx->buf_size; | |
2309 | head_seq_num = tid_agg_rx->head_seq_num; | |
2310 | ||
2311 | /* frame with out of date sequence number */ | |
2312 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2313 | dev_kfree_skb(skb); | |
2314 | return 1; | |
2315 | } | |
2316 | ||
2317 | /* if frame sequence number exceeds our buffering window size or | |
2318 | * block Ack Request arrived - release stored frames */ | |
2319 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2320 | /* new head to the ordering buffer */ | |
2321 | if (bar_req) | |
2322 | head_seq_num = mpdu_seq_num; | |
2323 | else | |
2324 | head_seq_num = | |
2325 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2326 | /* release stored frames up to new head to stack */ | |
2327 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2328 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2329 | tid_agg_rx->ssn) | |
2330 | % tid_agg_rx->buf_size; | |
2331 | ||
2332 | if (tid_agg_rx->reorder_buf[index]) { | |
2333 | /* release the reordered frames to stack */ | |
2334 | memcpy(&status, | |
2335 | tid_agg_rx->reorder_buf[index]->cb, | |
2336 | sizeof(status)); | |
8318d78a | 2337 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2338 | if (status.flag & RX_FLAG_HT) { |
2339 | /* TODO: HT rates */ | |
2340 | rate = sband->bitrates; | |
2341 | } else { | |
2342 | rate = &sband->bitrates | |
2343 | [status.rate_idx]; | |
2344 | } | |
b580781e RR |
2345 | __ieee80211_rx_handle_packet(hw, |
2346 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2347 | &status, rate); |
b580781e RR |
2348 | tid_agg_rx->stored_mpdu_num--; |
2349 | tid_agg_rx->reorder_buf[index] = NULL; | |
2350 | } | |
2351 | tid_agg_rx->head_seq_num = | |
2352 | seq_inc(tid_agg_rx->head_seq_num); | |
2353 | } | |
2354 | if (bar_req) | |
2355 | return 1; | |
2356 | } | |
2357 | ||
2358 | /* now the new frame is always in the range of the reordering */ | |
2359 | /* buffer window */ | |
2360 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2361 | % tid_agg_rx->buf_size; | |
2362 | /* check if we already stored this frame */ | |
2363 | if (tid_agg_rx->reorder_buf[index]) { | |
2364 | dev_kfree_skb(skb); | |
2365 | return 1; | |
2366 | } | |
2367 | ||
2368 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2369 | /* release it immediately */ | |
2370 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2371 | tid_agg_rx->stored_mpdu_num == 0) { | |
2372 | tid_agg_rx->head_seq_num = | |
2373 | seq_inc(tid_agg_rx->head_seq_num); | |
2374 | return 0; | |
2375 | } | |
2376 | ||
2377 | /* put the frame in the reordering buffer */ | |
2378 | tid_agg_rx->reorder_buf[index] = skb; | |
b3631286 VT |
2379 | memcpy(tid_agg_rx->reorder_buf[index]->cb, rxstatus, |
2380 | sizeof(*rxstatus)); | |
b580781e RR |
2381 | tid_agg_rx->stored_mpdu_num++; |
2382 | /* release the buffer until next missing frame */ | |
2383 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2384 | % tid_agg_rx->buf_size; | |
2385 | while (tid_agg_rx->reorder_buf[index]) { | |
2386 | /* release the reordered frame back to stack */ | |
2387 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2388 | sizeof(status)); | |
8318d78a | 2389 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2390 | if (status.flag & RX_FLAG_HT) |
2391 | rate = sband->bitrates; /* TODO: HT rates */ | |
2392 | else | |
2393 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2394 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2395 | &status, rate); |
b580781e RR |
2396 | tid_agg_rx->stored_mpdu_num--; |
2397 | tid_agg_rx->reorder_buf[index] = NULL; | |
2398 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2399 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2400 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2401 | } | |
2402 | return 1; | |
2403 | } | |
2404 | ||
71ebb4aa | 2405 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
b3631286 VT |
2406 | struct sk_buff *skb, |
2407 | struct ieee80211_rx_status *status) | |
b580781e RR |
2408 | { |
2409 | struct ieee80211_hw *hw = &local->hw; | |
2410 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2411 | struct sta_info *sta; | |
2412 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2413 | u16 sc; |
b580781e | 2414 | u16 mpdu_seq_num; |
182503ab | 2415 | u8 ret = 0; |
b580781e RR |
2416 | int tid; |
2417 | ||
2418 | sta = sta_info_get(local, hdr->addr2); | |
2419 | if (!sta) | |
2420 | return ret; | |
2421 | ||
b580781e RR |
2422 | /* filter the QoS data rx stream according to |
2423 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2424 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2425 | goto end_reorder; |
2426 | ||
238f74a2 | 2427 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2428 | |
cee24a3e | 2429 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2430 | goto end_reorder; |
2431 | ||
cee24a3e RR |
2432 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2433 | ||
2560b6e2 EG |
2434 | /* qos null data frames are excluded */ |
2435 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2436 | goto end_reorder; |
2437 | ||
2438 | /* new un-ordered ampdu frame - process it */ | |
2439 | ||
2440 | /* reset session timer */ | |
20ad19d0 JB |
2441 | if (tid_agg_rx->timeout) |
2442 | mod_timer(&tid_agg_rx->session_timer, | |
2443 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2444 | |
2445 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2446 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2447 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2448 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2449 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2450 | ret = 1; | |
2451 | goto end_reorder; | |
2452 | } | |
2453 | ||
2454 | /* according to mpdu sequence number deal with reordering buffer */ | |
2455 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
b3631286 | 2456 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, status, |
b580781e | 2457 | mpdu_seq_num, 0); |
d0709a65 | 2458 | end_reorder: |
b580781e RR |
2459 | return ret; |
2460 | } | |
2461 | ||
6368e4b1 RR |
2462 | /* |
2463 | * This is the receive path handler. It is called by a low level driver when an | |
2464 | * 802.11 MPDU is received from the hardware. | |
2465 | */ | |
2466 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2467 | struct ieee80211_rx_status *status) | |
2468 | { | |
2469 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2470 | struct ieee80211_rate *rate = NULL; |
2471 | struct ieee80211_supported_band *sband; | |
2472 | ||
2473 | if (status->band < 0 || | |
13d8fd2d | 2474 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2475 | WARN_ON(1); |
2476 | return; | |
2477 | } | |
2478 | ||
2479 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2480 | if (!sband) { |
8318d78a JB |
2481 | WARN_ON(1); |
2482 | return; | |
2483 | } | |
2484 | ||
0fb8ca45 JM |
2485 | if (status->flag & RX_FLAG_HT) { |
2486 | /* rate_idx is MCS index */ | |
2487 | if (WARN_ON(status->rate_idx < 0 || | |
2488 | status->rate_idx >= 76)) | |
2489 | return; | |
2490 | /* HT rates are not in the table - use the highest legacy rate | |
2491 | * for now since other parts of mac80211 may not yet be fully | |
2492 | * MCS aware. */ | |
2493 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2494 | } else { | |
2495 | if (WARN_ON(status->rate_idx < 0 || | |
2496 | status->rate_idx >= sband->n_bitrates)) | |
2497 | return; | |
2498 | rate = &sband->bitrates[status->rate_idx]; | |
2499 | } | |
6368e4b1 RR |
2500 | |
2501 | /* | |
2502 | * key references and virtual interfaces are protected using RCU | |
2503 | * and this requires that we are in a read-side RCU section during | |
2504 | * receive processing | |
2505 | */ | |
2506 | rcu_read_lock(); | |
2507 | ||
2508 | /* | |
2509 | * Frames with failed FCS/PLCP checksum are not returned, | |
2510 | * all other frames are returned without radiotap header | |
2511 | * if it was previously present. | |
2512 | * Also, frames with less than 16 bytes are dropped. | |
2513 | */ | |
8318d78a | 2514 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2515 | if (!skb) { |
2516 | rcu_read_unlock(); | |
2517 | return; | |
2518 | } | |
2519 | ||
b3631286 | 2520 | if (!ieee80211_rx_reorder_ampdu(local, skb, status)) |
9e72ebd6 | 2521 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2522 | |
2523 | rcu_read_unlock(); | |
2524 | } | |
571ecf67 JB |
2525 | EXPORT_SYMBOL(__ieee80211_rx); |
2526 | ||
2527 | /* This is a version of the rx handler that can be called from hard irq | |
2528 | * context. Post the skb on the queue and schedule the tasklet */ | |
2529 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2530 | struct ieee80211_rx_status *status) | |
2531 | { | |
2532 | struct ieee80211_local *local = hw_to_local(hw); | |
2533 | ||
2534 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2535 | ||
2536 | skb->dev = local->mdev; | |
2537 | /* copy status into skb->cb for use by tasklet */ | |
2538 | memcpy(skb->cb, status, sizeof(*status)); | |
2539 | skb->pkt_type = IEEE80211_RX_MSG; | |
2540 | skb_queue_tail(&local->skb_queue, skb); | |
2541 | tasklet_schedule(&local->tasklet); | |
2542 | } | |
2543 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |