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Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
b2e7771e JB |
30 | /* |
31 | * monitor mode reception | |
32 | * | |
33 | * This function cleans up the SKB, i.e. it removes all the stuff | |
34 | * only useful for monitoring. | |
35 | */ | |
36 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 37 | struct sk_buff *skb) |
b2e7771e | 38 | { |
b2e7771e JB |
39 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
40 | if (likely(skb->len > FCS_LEN)) | |
41 | skb_trim(skb, skb->len - FCS_LEN); | |
42 | else { | |
43 | /* driver bug */ | |
44 | WARN_ON(1); | |
45 | dev_kfree_skb(skb); | |
46 | skb = NULL; | |
47 | } | |
48 | } | |
49 | ||
50 | return skb; | |
51 | } | |
52 | ||
f1d58c25 | 53 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 54 | int present_fcs_len) |
b2e7771e | 55 | { |
f1d58c25 | 56 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 57 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
58 | |
59 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
60 | return 1; | |
0869aea0 | 61 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 62 | return 1; |
87228f57 HH |
63 | if (ieee80211_is_ctl(hdr->frame_control) && |
64 | !ieee80211_is_pspoll(hdr->frame_control) && | |
65 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
66 | return 1; |
67 | return 0; | |
68 | } | |
69 | ||
601ae7f2 BR |
70 | static int |
71 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
72 | struct ieee80211_rx_status *status) | |
73 | { | |
74 | int len; | |
75 | ||
76 | /* always present fields */ | |
77 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
78 | ||
79 | if (status->flag & RX_FLAG_TSFT) | |
80 | len += 8; | |
7fee5372 | 81 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
82 | len += 1; |
83 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
84 | len += 1; | |
85 | ||
86 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
87 | len++; | |
88 | ||
601ae7f2 BR |
89 | return len; |
90 | } | |
91 | ||
d1c3a37c | 92 | /* |
601ae7f2 BR |
93 | * ieee80211_add_rx_radiotap_header - add radiotap header |
94 | * | |
95 | * add a radiotap header containing all the fields which the hardware provided. | |
96 | */ | |
97 | static void | |
98 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
99 | struct sk_buff *skb, | |
601ae7f2 BR |
100 | struct ieee80211_rate *rate, |
101 | int rtap_len) | |
102 | { | |
f1d58c25 | 103 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
104 | struct ieee80211_radiotap_header *rthdr; |
105 | unsigned char *pos; | |
6a86b9c7 | 106 | u16 rx_flags = 0; |
601ae7f2 BR |
107 | |
108 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
109 | memset(rthdr, 0, rtap_len); | |
110 | ||
111 | /* radiotap header, set always present flags */ | |
112 | rthdr->it_present = | |
113 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
114 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
115 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
116 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
117 | rthdr->it_len = cpu_to_le16(rtap_len); | |
118 | ||
119 | pos = (unsigned char *)(rthdr+1); | |
120 | ||
121 | /* the order of the following fields is important */ | |
122 | ||
123 | /* IEEE80211_RADIOTAP_TSFT */ | |
124 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 125 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
126 | rthdr->it_present |= |
127 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
128 | pos += 8; | |
129 | } | |
130 | ||
131 | /* IEEE80211_RADIOTAP_FLAGS */ | |
132 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
133 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
134 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
135 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
136 | if (status->flag & RX_FLAG_SHORTPRE) |
137 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
138 | pos++; |
139 | ||
140 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
141 | if (status->flag & RX_FLAG_HT) { |
142 | /* | |
143 | * TODO: add following information into radiotap header once | |
144 | * suitable fields are defined for it: | |
145 | * - MCS index (status->rate_idx) | |
146 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
147 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
148 | */ | |
149 | *pos = 0; | |
8d6f658e | 150 | } else { |
ebe6c7ba | 151 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 152 | *pos = rate->bitrate / 5; |
8d6f658e | 153 | } |
601ae7f2 BR |
154 | pos++; |
155 | ||
156 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 157 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
158 | pos += 2; |
159 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
160 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
161 | pos); | |
5f0b7de5 JB |
162 | else if (status->flag & RX_FLAG_HT) |
163 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
164 | pos); | |
9deb1ae5 | 165 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
166 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
167 | pos); | |
601ae7f2 | 168 | else |
6a86b9c7 JB |
169 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
170 | pos); | |
601ae7f2 BR |
171 | pos += 2; |
172 | ||
173 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
174 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
175 | *pos = status->signal; | |
176 | rthdr->it_present |= | |
177 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
178 | pos++; | |
179 | } | |
180 | ||
181 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
182 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
183 | *pos = status->noise; | |
184 | rthdr->it_present |= | |
185 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
186 | pos++; | |
187 | } | |
188 | ||
189 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
190 | ||
191 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
192 | *pos = status->antenna; | |
193 | pos++; | |
194 | ||
601ae7f2 BR |
195 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
196 | ||
197 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
198 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 199 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 200 | pos++; |
aae89831 | 201 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
202 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
203 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
204 | pos += 2; |
205 | } | |
206 | ||
b2e7771e JB |
207 | /* |
208 | * This function copies a received frame to all monitor interfaces and | |
209 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
210 | * radiotap header the driver might have added. | |
211 | */ | |
212 | static struct sk_buff * | |
213 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 214 | struct ieee80211_rate *rate) |
b2e7771e | 215 | { |
f1d58c25 | 216 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 217 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 218 | int needed_headroom = 0; |
b2e7771e JB |
219 | struct sk_buff *skb, *skb2; |
220 | struct net_device *prev_dev = NULL; | |
221 | int present_fcs_len = 0; | |
b2e7771e JB |
222 | |
223 | /* | |
224 | * First, we may need to make a copy of the skb because | |
225 | * (1) we need to modify it for radiotap (if not present), and | |
226 | * (2) the other RX handlers will modify the skb we got. | |
227 | * | |
228 | * We don't need to, of course, if we aren't going to return | |
229 | * the SKB because it has a bad FCS/PLCP checksum. | |
230 | */ | |
0869aea0 JB |
231 | |
232 | /* room for the radiotap header based on driver features */ | |
233 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
234 | |
235 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
236 | present_fcs_len = FCS_LEN; | |
237 | ||
238 | if (!local->monitors) { | |
0869aea0 | 239 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
240 | dev_kfree_skb(origskb); |
241 | return NULL; | |
242 | } | |
243 | ||
0869aea0 | 244 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
245 | } |
246 | ||
0869aea0 | 247 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
248 | /* only need to expand headroom if necessary */ |
249 | skb = origskb; | |
250 | origskb = NULL; | |
251 | ||
252 | /* | |
253 | * This shouldn't trigger often because most devices have an | |
254 | * RX header they pull before we get here, and that should | |
255 | * be big enough for our radiotap information. We should | |
256 | * probably export the length to drivers so that we can have | |
257 | * them allocate enough headroom to start with. | |
258 | */ | |
259 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 260 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
261 | dev_kfree_skb(skb); |
262 | return NULL; | |
263 | } | |
264 | } else { | |
265 | /* | |
266 | * Need to make a copy and possibly remove radiotap header | |
267 | * and FCS from the original. | |
268 | */ | |
269 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
270 | ||
0869aea0 | 271 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
272 | |
273 | if (!skb) | |
274 | return origskb; | |
275 | } | |
276 | ||
0869aea0 JB |
277 | /* prepend radiotap information */ |
278 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 279 | |
ce3edf6d | 280 | skb_reset_mac_header(skb); |
b2e7771e JB |
281 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
282 | skb->pkt_type = PACKET_OTHERHOST; | |
283 | skb->protocol = htons(ETH_P_802_2); | |
284 | ||
285 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
286 | if (!netif_running(sdata->dev)) | |
287 | continue; | |
288 | ||
05c914fe | 289 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
290 | continue; |
291 | ||
3d30d949 MW |
292 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
293 | continue; | |
294 | ||
b2e7771e JB |
295 | if (prev_dev) { |
296 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
297 | if (skb2) { | |
298 | skb2->dev = prev_dev; | |
299 | netif_rx(skb2); | |
300 | } | |
301 | } | |
302 | ||
303 | prev_dev = sdata->dev; | |
304 | sdata->dev->stats.rx_packets++; | |
305 | sdata->dev->stats.rx_bytes += skb->len; | |
306 | } | |
307 | ||
308 | if (prev_dev) { | |
309 | skb->dev = prev_dev; | |
310 | netif_rx(skb); | |
311 | } else | |
312 | dev_kfree_skb(skb); | |
313 | ||
314 | return origskb; | |
315 | } | |
316 | ||
317 | ||
5cf121c3 | 318 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 319 | { |
238f74a2 | 320 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
321 | int tid; |
322 | ||
323 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
324 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
325 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 326 | /* frame has qos control */ |
238f74a2 HH |
327 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
328 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 329 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 330 | else |
5cf121c3 | 331 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 332 | } else { |
1411f9b5 JB |
333 | /* |
334 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
335 | * | |
336 | * Sequence numbers for management frames, QoS data | |
337 | * frames with a broadcast/multicast address in the | |
338 | * Address 1 field, and all non-QoS data frames sent | |
339 | * by QoS STAs are assigned using an additional single | |
340 | * modulo-4096 counter, [...] | |
341 | * | |
342 | * We also use that counter for non-QoS STAs. | |
343 | */ | |
344 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 345 | } |
52865dfd | 346 | |
5cf121c3 | 347 | rx->queue = tid; |
6e0d114d JB |
348 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
349 | * For now, set skb->priority to 0 for other cases. */ | |
350 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 351 | } |
6e0d114d | 352 | |
d1c3a37c JB |
353 | /** |
354 | * DOC: Packet alignment | |
355 | * | |
356 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
357 | * to the stack. | |
358 | * | |
359 | * Additionally, should, if possible, align the payload data in a way that | |
360 | * guarantees that the contained IP header is aligned to a four-byte | |
361 | * boundary. In the case of regular frames, this simply means aligning the | |
362 | * payload to a four-byte boundary (because either the IP header is directly | |
363 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
364 | * in front of it). | |
365 | * | |
366 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
367 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
368 | * push the IP header further back to a multiple of four again. Thankfully, the | |
369 | * specs were sane enough this time around to require padding each A-MSDU | |
370 | * subframe to a length that is a multiple of four. | |
371 | * | |
372 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
373 | * the payload is not supported, the driver is required to move the 802.11 | |
374 | * header to be directly in front of the payload in that case. | |
375 | */ | |
376 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 377 | { |
a7767f95 | 378 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
379 | int hdrlen; |
380 | ||
d1c3a37c JB |
381 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
382 | return; | |
383 | #endif | |
384 | ||
385 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
386 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
387 | return; | |
388 | ||
a7767f95 | 389 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
390 | return; |
391 | ||
a7767f95 | 392 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 393 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 394 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
395 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
396 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
397 | } |
398 | ||
6368e4b1 | 399 | |
571ecf67 JB |
400 | /* rx handlers */ |
401 | ||
49461622 | 402 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 403 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
404 | { |
405 | struct ieee80211_local *local = rx->local; | |
406 | struct sk_buff *skb = rx->skb; | |
407 | ||
fbe9c429 | 408 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 409 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 410 | |
142b9f50 HS |
411 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
412 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 413 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 414 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 415 | dev_kfree_skb(skb); |
9ae54c84 | 416 | return RX_QUEUED; |
571ecf67 JB |
417 | } |
418 | ||
5cf121c3 | 419 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
420 | /* scanning finished during invoking of handlers */ |
421 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 422 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
423 | } |
424 | ||
9ae54c84 | 425 | return RX_CONTINUE; |
571ecf67 JB |
426 | } |
427 | ||
3cfcf6ac JM |
428 | |
429 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
430 | { | |
431 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
432 | ||
433 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
434 | return 0; | |
435 | ||
436 | return ieee80211_is_robust_mgmt_frame(hdr); | |
437 | } | |
438 | ||
439 | ||
440 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
441 | { | |
442 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
443 | ||
444 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
445 | return 0; | |
446 | ||
447 | return ieee80211_is_robust_mgmt_frame(hdr); | |
448 | } | |
449 | ||
450 | ||
451 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
452 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
453 | { | |
454 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
455 | struct ieee80211_mmie *mmie; | |
456 | ||
457 | if (skb->len < 24 + sizeof(*mmie) || | |
458 | !is_multicast_ether_addr(hdr->da)) | |
459 | return -1; | |
460 | ||
461 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
462 | return -1; /* not a robust management frame */ | |
463 | ||
464 | mmie = (struct ieee80211_mmie *) | |
465 | (skb->data + skb->len - sizeof(*mmie)); | |
466 | if (mmie->element_id != WLAN_EID_MMIE || | |
467 | mmie->length != sizeof(*mmie) - 2) | |
468 | return -1; | |
469 | ||
470 | return le16_to_cpu(mmie->key_id); | |
471 | } | |
472 | ||
473 | ||
33b64eb2 | 474 | static ieee80211_rx_result |
5cf121c3 | 475 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 476 | { |
a7767f95 HH |
477 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
478 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
eb9fb5b8 | 479 | char *dev_addr = rx->sdata->dev->dev_addr; |
d6d1a5a7 | 480 | |
a7767f95 | 481 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
482 | if (is_multicast_ether_addr(hdr->addr1)) { |
483 | if (ieee80211_has_tods(hdr->frame_control) || | |
484 | !ieee80211_has_fromds(hdr->frame_control)) | |
485 | return RX_DROP_MONITOR; | |
486 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
487 | return RX_DROP_MONITOR; | |
488 | } else { | |
489 | if (!ieee80211_has_a4(hdr->frame_control)) | |
490 | return RX_DROP_MONITOR; | |
491 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
492 | return RX_DROP_MONITOR; | |
493 | } | |
33b64eb2 LCC |
494 | } |
495 | ||
496 | /* If there is not an established peer link and this is not a peer link | |
497 | * establisment frame, beacon or probe, drop the frame. | |
498 | */ | |
499 | ||
b4e08ea1 | 500 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 501 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 502 | |
a7767f95 | 503 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
504 | return RX_DROP_MONITOR; |
505 | ||
a7767f95 | 506 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 507 | mgmt = (struct ieee80211_mgmt *)hdr; |
0938393f | 508 | if (mgmt->u.action.category != MESH_PLINK_CATEGORY) |
33b64eb2 | 509 | return RX_DROP_MONITOR; |
33b64eb2 | 510 | return RX_CONTINUE; |
33b64eb2 LCC |
511 | } |
512 | ||
a7767f95 HH |
513 | if (ieee80211_is_probe_req(hdr->frame_control) || |
514 | ieee80211_is_probe_resp(hdr->frame_control) || | |
515 | ieee80211_is_beacon(hdr->frame_control)) | |
516 | return RX_CONTINUE; | |
517 | ||
518 | return RX_DROP_MONITOR; | |
519 | ||
520 | } | |
521 | ||
522 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
523 | ||
524 | if (ieee80211_is_data(hdr->frame_control) && | |
525 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 526 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 527 | return RX_DROP_MONITOR; |
902acc78 | 528 | #undef msh_h_get |
d6d1a5a7 | 529 | |
902acc78 JB |
530 | return RX_CONTINUE; |
531 | } | |
33b64eb2 | 532 | |
1edfb1af JB |
533 | #define SEQ_MODULO 0x1000 |
534 | #define SEQ_MASK 0xfff | |
535 | ||
536 | static inline int seq_less(u16 sq1, u16 sq2) | |
537 | { | |
538 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
539 | } | |
540 | ||
541 | static inline u16 seq_inc(u16 sq) | |
542 | { | |
543 | return (sq + 1) & SEQ_MASK; | |
544 | } | |
545 | ||
546 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
547 | { | |
548 | return (sq1 - sq2) & SEQ_MASK; | |
549 | } | |
550 | ||
551 | ||
552 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
553 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
554 | int index, |
555 | struct sk_buff_head *frames) | |
1edfb1af JB |
556 | { |
557 | struct ieee80211_supported_band *sband; | |
558 | struct ieee80211_rate *rate = NULL; | |
559 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; | |
560 | struct ieee80211_rx_status *status; | |
561 | ||
562 | if (!skb) | |
563 | goto no_frame; | |
564 | ||
565 | status = IEEE80211_SKB_RXCB(skb); | |
566 | ||
567 | /* release the reordered frames to stack */ | |
568 | sband = hw->wiphy->bands[status->band]; | |
569 | if (!(status->flag & RX_FLAG_HT)) | |
570 | rate = &sband->bitrates[status->rate_idx]; | |
1edfb1af JB |
571 | tid_agg_rx->stored_mpdu_num--; |
572 | tid_agg_rx->reorder_buf[index] = NULL; | |
d29cecda | 573 | __skb_queue_tail(frames, skb); |
1edfb1af JB |
574 | |
575 | no_frame: | |
576 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
577 | } | |
578 | ||
579 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
580 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
581 | u16 head_seq_num, |
582 | struct sk_buff_head *frames) | |
1edfb1af JB |
583 | { |
584 | int index; | |
585 | ||
586 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
587 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
588 | tid_agg_rx->buf_size; | |
2569a826 | 589 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
590 | } |
591 | } | |
592 | ||
593 | /* | |
594 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
595 | * the skb was added to the buffer longer than this time ago, the earlier | |
596 | * frames that have not yet been received are assumed to be lost and the skb | |
597 | * can be released for processing. This may also release other skb's from the | |
598 | * reorder buffer if there are no additional gaps between the frames. | |
599 | */ | |
600 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
601 | ||
602 | /* | |
603 | * As this function belongs to the RX path it must be under | |
604 | * rcu_read_lock protection. It returns false if the frame | |
605 | * can be processed immediately, true if it was consumed. | |
606 | */ | |
607 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
608 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
609 | struct sk_buff *skb, |
610 | struct sk_buff_head *frames) | |
1edfb1af JB |
611 | { |
612 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
613 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
614 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
615 | u16 head_seq_num, buf_size; | |
616 | int index; | |
617 | ||
618 | buf_size = tid_agg_rx->buf_size; | |
619 | head_seq_num = tid_agg_rx->head_seq_num; | |
620 | ||
621 | /* frame with out of date sequence number */ | |
622 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
623 | dev_kfree_skb(skb); | |
624 | return true; | |
625 | } | |
626 | ||
627 | /* | |
628 | * If frame the sequence number exceeds our buffering window | |
629 | * size release some previous frames to make room for this one. | |
630 | */ | |
631 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
632 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
633 | /* release stored frames up to new head to stack */ | |
2569a826 JB |
634 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
635 | frames); | |
1edfb1af JB |
636 | } |
637 | ||
638 | /* Now the new frame is always in the range of the reordering buffer */ | |
639 | ||
640 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
641 | ||
642 | /* check if we already stored this frame */ | |
643 | if (tid_agg_rx->reorder_buf[index]) { | |
644 | dev_kfree_skb(skb); | |
645 | return true; | |
646 | } | |
647 | ||
648 | /* | |
649 | * If the current MPDU is in the right order and nothing else | |
650 | * is stored we can process it directly, no need to buffer it. | |
651 | */ | |
652 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
653 | tid_agg_rx->stored_mpdu_num == 0) { | |
654 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
655 | return false; | |
656 | } | |
657 | ||
658 | /* put the frame in the reordering buffer */ | |
659 | tid_agg_rx->reorder_buf[index] = skb; | |
660 | tid_agg_rx->reorder_time[index] = jiffies; | |
661 | tid_agg_rx->stored_mpdu_num++; | |
662 | /* release the buffer until next missing frame */ | |
663 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
664 | tid_agg_rx->buf_size; | |
665 | if (!tid_agg_rx->reorder_buf[index] && | |
666 | tid_agg_rx->stored_mpdu_num > 1) { | |
667 | /* | |
668 | * No buffers ready to be released, but check whether any | |
669 | * frames in the reorder buffer have timed out. | |
670 | */ | |
671 | int j; | |
672 | int skipped = 1; | |
673 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
674 | j = (j + 1) % tid_agg_rx->buf_size) { | |
675 | if (!tid_agg_rx->reorder_buf[j]) { | |
676 | skipped++; | |
677 | continue; | |
678 | } | |
679 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
680 | HT_RX_REORDER_BUF_TIMEOUT)) | |
681 | break; | |
682 | ||
683 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
684 | if (net_ratelimit()) | |
685 | printk(KERN_DEBUG "%s: release an RX reorder " | |
686 | "frame due to timeout on earlier " | |
687 | "frames\n", | |
688 | wiphy_name(hw->wiphy)); | |
689 | #endif | |
2569a826 JB |
690 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
691 | j, frames); | |
1edfb1af JB |
692 | |
693 | /* | |
694 | * Increment the head seq# also for the skipped slots. | |
695 | */ | |
696 | tid_agg_rx->head_seq_num = | |
697 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
698 | skipped = 0; | |
699 | } | |
700 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2569a826 | 701 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
702 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
703 | tid_agg_rx->buf_size; | |
704 | } | |
705 | ||
706 | return true; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
711 | * true if the MPDU was buffered, false if it should be processed. | |
712 | */ | |
2569a826 JB |
713 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
714 | struct sk_buff_head *frames) | |
1edfb1af | 715 | { |
2569a826 JB |
716 | struct sk_buff *skb = rx->skb; |
717 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
718 | struct ieee80211_hw *hw = &local->hw; |
719 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 720 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
721 | struct tid_ampdu_rx *tid_agg_rx; |
722 | u16 sc; | |
723 | int tid; | |
724 | ||
725 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 726 | goto dont_reorder; |
1edfb1af JB |
727 | |
728 | /* | |
729 | * filter the QoS data rx stream according to | |
730 | * STA/TID and check if this STA/TID is on aggregation | |
731 | */ | |
732 | ||
1edfb1af | 733 | if (!sta) |
2569a826 | 734 | goto dont_reorder; |
1edfb1af JB |
735 | |
736 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
737 | ||
738 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) | |
2569a826 | 739 | goto dont_reorder; |
1edfb1af JB |
740 | |
741 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
742 | ||
743 | /* qos null data frames are excluded */ | |
744 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
2569a826 | 745 | goto dont_reorder; |
1edfb1af JB |
746 | |
747 | /* new, potentially un-ordered, ampdu frame - process it */ | |
748 | ||
749 | /* reset session timer */ | |
750 | if (tid_agg_rx->timeout) | |
751 | mod_timer(&tid_agg_rx->session_timer, | |
752 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
753 | ||
754 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
755 | sc = le16_to_cpu(hdr->seq_ctrl); | |
756 | if (sc & IEEE80211_SCTL_FRAG) { | |
757 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
758 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); | |
759 | dev_kfree_skb(skb); | |
2569a826 | 760 | return; |
1edfb1af JB |
761 | } |
762 | ||
2569a826 JB |
763 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) |
764 | return; | |
765 | ||
766 | dont_reorder: | |
767 | __skb_queue_tail(frames, skb); | |
1edfb1af | 768 | } |
33b64eb2 | 769 | |
49461622 | 770 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 771 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 772 | { |
a7767f95 | 773 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
774 | |
775 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
776 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 777 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 778 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 779 | hdr->seq_ctrl)) { |
5cf121c3 | 780 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
781 | rx->local->dot11FrameDuplicateCount++; |
782 | rx->sta->num_duplicates++; | |
783 | } | |
e4c26add | 784 | return RX_DROP_MONITOR; |
571ecf67 | 785 | } else |
5cf121c3 | 786 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
787 | } |
788 | ||
571ecf67 JB |
789 | if (unlikely(rx->skb->len < 16)) { |
790 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 791 | return RX_DROP_MONITOR; |
571ecf67 JB |
792 | } |
793 | ||
571ecf67 JB |
794 | /* Drop disallowed frame classes based on STA auth/assoc state; |
795 | * IEEE 802.11, Chap 5.5. | |
796 | * | |
ccd7b362 JB |
797 | * mac80211 filters only based on association state, i.e. it drops |
798 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
799 | * deauth/disassoc frames when needed. In addition, hostapd is |
800 | * responsible for filtering on both auth and assoc states. | |
801 | */ | |
33b64eb2 | 802 | |
902acc78 | 803 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 804 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 805 | |
a7767f95 HH |
806 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
807 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 808 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 809 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
810 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
811 | !ieee80211_has_tods(hdr->frame_control) && | |
812 | ieee80211_is_data(hdr->frame_control)) || | |
813 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
814 | /* Drop IBSS frames and frames for other hosts |
815 | * silently. */ | |
e4c26add | 816 | return RX_DROP_MONITOR; |
571ecf67 JB |
817 | } |
818 | ||
e4c26add | 819 | return RX_DROP_MONITOR; |
571ecf67 JB |
820 | } |
821 | ||
9ae54c84 | 822 | return RX_CONTINUE; |
570bd537 JB |
823 | } |
824 | ||
825 | ||
49461622 | 826 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 827 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 828 | { |
eb9fb5b8 JB |
829 | struct sk_buff *skb = rx->skb; |
830 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
831 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
832 | int keyidx; |
833 | int hdrlen; | |
e4c26add | 834 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 835 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 836 | int mmie_keyidx = -1; |
570bd537 | 837 | |
3017b80b JB |
838 | /* |
839 | * Key selection 101 | |
840 | * | |
3cfcf6ac | 841 | * There are four types of keys: |
3017b80b | 842 | * - GTK (group keys) |
3cfcf6ac | 843 | * - IGTK (group keys for management frames) |
3017b80b JB |
844 | * - PTK (pairwise keys) |
845 | * - STK (station-to-station pairwise keys) | |
846 | * | |
847 | * When selecting a key, we have to distinguish between multicast | |
848 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
849 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
850 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
851 | * unicast frames can also use key indices like GTKs. Hence, if we | |
852 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 853 | * |
8dc06a1c JB |
854 | * Note that in a regular BSS, multicast frames are sent by the |
855 | * AP only, associated stations unicast the frame to the AP first | |
856 | * which then multicasts it on their behalf. | |
857 | * | |
3017b80b JB |
858 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
859 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
860 | * The spec seems to expect that one negotiates the same key with |
861 | * every station but there's no such requirement; VLANs could be | |
862 | * possible. | |
3017b80b JB |
863 | */ |
864 | ||
3017b80b | 865 | /* |
1990af8d | 866 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
867 | * addressed to us nor a multicast frame. |
868 | */ | |
5cf121c3 | 869 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 870 | return RX_CONTINUE; |
3017b80b | 871 | |
2569a826 JB |
872 | /* start without a key */ |
873 | rx->key = NULL; | |
874 | ||
d4e46a3d JB |
875 | if (rx->sta) |
876 | stakey = rcu_dereference(rx->sta->key); | |
877 | ||
0c7c10c7 JM |
878 | if (!ieee80211_has_protected(hdr->frame_control)) |
879 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
880 | ||
d4e46a3d JB |
881 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
882 | rx->key = stakey; | |
0c7c10c7 JM |
883 | /* Skip decryption if the frame is not protected. */ |
884 | if (!ieee80211_has_protected(hdr->frame_control)) | |
885 | return RX_CONTINUE; | |
3cfcf6ac JM |
886 | } else if (mmie_keyidx >= 0) { |
887 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
888 | if ((status->flag & RX_FLAG_DECRYPTED) && |
889 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
890 | return RX_CONTINUE; |
891 | ||
892 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
893 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
894 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
895 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
896 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
897 | /* | |
898 | * The frame was not protected, so skip decryption. However, we | |
899 | * need to set rx->key if there is a key that could have been | |
900 | * used so that the frame may be dropped if encryption would | |
901 | * have been expected. | |
902 | */ | |
903 | struct ieee80211_key *key = NULL; | |
904 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
905 | is_multicast_ether_addr(hdr->addr1) && | |
906 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
907 | rx->key = key; | |
908 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
909 | rx->key = key; | |
910 | return RX_CONTINUE; | |
571ecf67 | 911 | } else { |
3017b80b JB |
912 | /* |
913 | * The device doesn't give us the IV so we won't be | |
914 | * able to look up the key. That's ok though, we | |
915 | * don't need to decrypt the frame, we just won't | |
916 | * be able to keep statistics accurate. | |
917 | * Except for key threshold notifications, should | |
918 | * we somehow allow the driver to tell us which key | |
919 | * the hardware used if this flag is set? | |
920 | */ | |
eb9fb5b8 JB |
921 | if ((status->flag & RX_FLAG_DECRYPTED) && |
922 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 923 | return RX_CONTINUE; |
3017b80b | 924 | |
a7767f95 | 925 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
926 | |
927 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 928 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
929 | |
930 | /* | |
931 | * no need to call ieee80211_wep_get_keyidx, | |
932 | * it verifies a bunch of things we've done already | |
933 | */ | |
934 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
935 | ||
d4e46a3d | 936 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
937 | |
938 | /* | |
939 | * RSNA-protected unicast frames should always be sent with | |
940 | * pairwise or station-to-station keys, but for WEP we allow | |
941 | * using a key index as well. | |
942 | */ | |
8f20fc24 | 943 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
944 | !is_multicast_ether_addr(hdr->addr1)) |
945 | rx->key = NULL; | |
571ecf67 JB |
946 | } |
947 | ||
3017b80b | 948 | if (rx->key) { |
571ecf67 | 949 | rx->key->tx_rx_count++; |
011bfcc4 | 950 | /* TODO: add threshold stuff again */ |
1990af8d | 951 | } else { |
e4c26add | 952 | return RX_DROP_MONITOR; |
70f08765 JB |
953 | } |
954 | ||
1990af8d JB |
955 | /* Check for weak IVs if possible */ |
956 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 957 | ieee80211_is_data(hdr->frame_control) && |
eb9fb5b8 JB |
958 | (!(status->flag & RX_FLAG_IV_STRIPPED) || |
959 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
960 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
961 | rx->sta->wep_weak_iv_count++; | |
962 | ||
70f08765 JB |
963 | switch (rx->key->conf.alg) { |
964 | case ALG_WEP: | |
e2f036da MN |
965 | result = ieee80211_crypto_wep_decrypt(rx); |
966 | break; | |
70f08765 | 967 | case ALG_TKIP: |
e2f036da MN |
968 | result = ieee80211_crypto_tkip_decrypt(rx); |
969 | break; | |
70f08765 | 970 | case ALG_CCMP: |
e2f036da MN |
971 | result = ieee80211_crypto_ccmp_decrypt(rx); |
972 | break; | |
3cfcf6ac JM |
973 | case ALG_AES_CMAC: |
974 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
975 | break; | |
70f08765 JB |
976 | } |
977 | ||
e2f036da | 978 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 979 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
980 | |
981 | return result; | |
70f08765 JB |
982 | } |
983 | ||
572e0012 KV |
984 | static ieee80211_rx_result debug_noinline |
985 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
986 | { | |
987 | struct ieee80211_local *local; | |
988 | struct ieee80211_hdr *hdr; | |
989 | struct sk_buff *skb; | |
990 | ||
991 | local = rx->local; | |
992 | skb = rx->skb; | |
993 | hdr = (struct ieee80211_hdr *) skb->data; | |
994 | ||
995 | if (!local->pspolling) | |
996 | return RX_CONTINUE; | |
997 | ||
998 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
999 | /* this is not from AP */ | |
1000 | return RX_CONTINUE; | |
1001 | ||
1002 | if (!ieee80211_is_data(hdr->frame_control)) | |
1003 | return RX_CONTINUE; | |
1004 | ||
1005 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1006 | /* AP has no more frames buffered for us */ | |
1007 | local->pspolling = false; | |
1008 | return RX_CONTINUE; | |
1009 | } | |
1010 | ||
1011 | /* more data bit is set, let's request a new frame from the AP */ | |
1012 | ieee80211_send_pspoll(local, rx->sdata); | |
1013 | ||
1014 | return RX_CONTINUE; | |
1015 | } | |
1016 | ||
133b8226 | 1017 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1018 | { |
133b8226 | 1019 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1020 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1021 | |
3e122be0 | 1022 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1023 | set_sta_flags(sta, WLAN_STA_PS_STA); |
24487981 | 1024 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1025 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
1026 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
1027 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
1028 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1029 | } | |
1030 | ||
ff9458d3 | 1031 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1032 | { |
133b8226 | 1033 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1034 | |
3e122be0 | 1035 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1036 | |
af818581 | 1037 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
004c872e | 1038 | |
571ecf67 | 1039 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
1040 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
1041 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 1042 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1043 | |
af818581 | 1044 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1045 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 JB |
1046 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
1047 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 1048 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1049 | return; |
1050 | } | |
1051 | ||
1052 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1053 | } |
1054 | ||
49461622 | 1055 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1056 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1057 | { |
1058 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1059 | struct sk_buff *skb = rx->skb; |
1060 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1061 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1062 | |
1063 | if (!sta) | |
9ae54c84 | 1064 | return RX_CONTINUE; |
571ecf67 | 1065 | |
b291ba11 JB |
1066 | /* |
1067 | * Update last_rx only for IBSS packets which are for the current | |
1068 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1069 | * where other STAs start using different BSSID. | |
1070 | */ | |
05c914fe | 1071 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1072 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1073 | NL80211_IFTYPE_ADHOC); |
46900298 | 1074 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1075 | sta->last_rx = jiffies; |
b291ba11 JB |
1076 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1077 | /* | |
33b64eb2 LCC |
1078 | * Mesh beacons will update last_rx when if they are found to |
1079 | * match the current local configuration when processed. | |
571ecf67 | 1080 | */ |
b291ba11 | 1081 | sta->last_rx = jiffies; |
571ecf67 JB |
1082 | } |
1083 | ||
5cf121c3 | 1084 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1085 | return RX_CONTINUE; |
571ecf67 | 1086 | |
3cf335d5 KV |
1087 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1088 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1089 | ||
571ecf67 JB |
1090 | sta->rx_fragments++; |
1091 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 JB |
1092 | sta->last_signal = status->signal; |
1093 | sta->last_noise = status->noise; | |
571ecf67 | 1094 | |
72eaa43a JB |
1095 | /* |
1096 | * Change STA power saving mode only at the end of a frame | |
1097 | * exchange sequence. | |
1098 | */ | |
3e122be0 | 1099 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
1100 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1101 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1102 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1103 | /* |
1104 | * Ignore doze->wake transitions that are | |
1105 | * indicated by non-data frames, the standard | |
1106 | * is unclear here, but for example going to | |
1107 | * PS mode and then scanning would cause a | |
1108 | * doze->wake transition for the probe request, | |
1109 | * and that is clearly undesirable. | |
1110 | */ | |
1111 | if (ieee80211_is_data(hdr->frame_control) && | |
1112 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1113 | ap_sta_ps_end(sta); |
72eaa43a JB |
1114 | } else { |
1115 | if (ieee80211_has_pm(hdr->frame_control)) | |
1116 | ap_sta_ps_start(sta); | |
1117 | } | |
571ecf67 JB |
1118 | } |
1119 | ||
22403def JB |
1120 | /* |
1121 | * Drop (qos-)data::nullfunc frames silently, since they | |
1122 | * are used only to control station power saving mode. | |
1123 | */ | |
1124 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1125 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1126 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
22403def JB |
1127 | /* |
1128 | * Update counter and free packet here to avoid | |
1129 | * counting this as a dropped packed. | |
1130 | */ | |
571ecf67 JB |
1131 | sta->rx_packets++; |
1132 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1133 | return RX_QUEUED; |
571ecf67 JB |
1134 | } |
1135 | ||
9ae54c84 | 1136 | return RX_CONTINUE; |
571ecf67 JB |
1137 | } /* ieee80211_rx_h_sta_process */ |
1138 | ||
571ecf67 JB |
1139 | static inline struct ieee80211_fragment_entry * |
1140 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1141 | unsigned int frag, unsigned int seq, int rx_queue, | |
1142 | struct sk_buff **skb) | |
1143 | { | |
1144 | struct ieee80211_fragment_entry *entry; | |
1145 | int idx; | |
1146 | ||
1147 | idx = sdata->fragment_next; | |
1148 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1149 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1150 | sdata->fragment_next = 0; | |
1151 | ||
1152 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1153 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1154 | struct ieee80211_hdr *hdr = |
1155 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1156 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1157 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1158 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
1159 | sdata->dev->name, idx, |
1160 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 1161 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1162 | #endif |
571ecf67 JB |
1163 | __skb_queue_purge(&entry->skb_list); |
1164 | } | |
1165 | ||
1166 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1167 | *skb = NULL; | |
1168 | entry->first_frag_time = jiffies; | |
1169 | entry->seq = seq; | |
1170 | entry->rx_queue = rx_queue; | |
1171 | entry->last_frag = frag; | |
1172 | entry->ccmp = 0; | |
1173 | entry->extra_len = 0; | |
1174 | ||
1175 | return entry; | |
1176 | } | |
1177 | ||
1178 | static inline struct ieee80211_fragment_entry * | |
1179 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1180 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1181 | int rx_queue, struct ieee80211_hdr *hdr) |
1182 | { | |
1183 | struct ieee80211_fragment_entry *entry; | |
1184 | int i, idx; | |
1185 | ||
1186 | idx = sdata->fragment_next; | |
1187 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1188 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1189 | |
1190 | idx--; | |
1191 | if (idx < 0) | |
1192 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1193 | ||
1194 | entry = &sdata->fragments[idx]; | |
1195 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1196 | entry->rx_queue != rx_queue || | |
1197 | entry->last_frag + 1 != frag) | |
1198 | continue; | |
1199 | ||
b73d70ad | 1200 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1201 | |
b73d70ad HH |
1202 | /* |
1203 | * Check ftype and addresses are equal, else check next fragment | |
1204 | */ | |
1205 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1206 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1207 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1208 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1209 | continue; | |
1210 | ||
ab46623e | 1211 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1212 | __skb_queue_purge(&entry->skb_list); |
1213 | continue; | |
1214 | } | |
1215 | return entry; | |
1216 | } | |
1217 | ||
1218 | return NULL; | |
1219 | } | |
1220 | ||
49461622 | 1221 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1222 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1223 | { |
1224 | struct ieee80211_hdr *hdr; | |
1225 | u16 sc; | |
358c8d9d | 1226 | __le16 fc; |
571ecf67 JB |
1227 | unsigned int frag, seq; |
1228 | struct ieee80211_fragment_entry *entry; | |
1229 | struct sk_buff *skb; | |
1230 | ||
b73d70ad | 1231 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1232 | fc = hdr->frame_control; |
571ecf67 JB |
1233 | sc = le16_to_cpu(hdr->seq_ctrl); |
1234 | frag = sc & IEEE80211_SCTL_FRAG; | |
1235 | ||
358c8d9d | 1236 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1237 | (rx->skb)->len < 24 || |
1238 | is_multicast_ether_addr(hdr->addr1))) { | |
1239 | /* not fragmented */ | |
1240 | goto out; | |
1241 | } | |
1242 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1243 | ||
1244 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1245 | ||
1246 | if (frag == 0) { | |
1247 | /* This is the first fragment of a new frame. */ | |
1248 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1249 | rx->queue, &(rx->skb)); |
8f20fc24 | 1250 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1251 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1252 | /* Store CCMP PN so that we can verify that the next |
1253 | * fragment has a sequential PN value. */ | |
1254 | entry->ccmp = 1; | |
1255 | memcpy(entry->last_pn, | |
5cf121c3 | 1256 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1257 | CCMP_PN_LEN); |
1258 | } | |
9ae54c84 | 1259 | return RX_QUEUED; |
571ecf67 JB |
1260 | } |
1261 | ||
1262 | /* This is a fragment for a frame that should already be pending in | |
1263 | * fragment cache. Add this fragment to the end of the pending entry. | |
1264 | */ | |
b73d70ad | 1265 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1266 | if (!entry) { |
1267 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1268 | return RX_DROP_MONITOR; |
571ecf67 JB |
1269 | } |
1270 | ||
1271 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1272 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1273 | if (entry->ccmp) { | |
1274 | int i; | |
1275 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1276 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1277 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1278 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1279 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1280 | pn[i]++; | |
1281 | if (pn[i]) | |
1282 | break; | |
1283 | } | |
5cf121c3 | 1284 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1285 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1286 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1287 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1288 | } | |
1289 | ||
358c8d9d | 1290 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1291 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1292 | entry->last_frag = frag; | |
1293 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1294 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1295 | rx->skb = NULL; |
9ae54c84 | 1296 | return RX_QUEUED; |
571ecf67 JB |
1297 | } |
1298 | ||
1299 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1300 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1301 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1302 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1303 | GFP_ATOMIC))) { | |
1304 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1305 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1306 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1307 | } |
1308 | } | |
1309 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1310 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1311 | dev_kfree_skb(skb); | |
1312 | } | |
1313 | ||
1314 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1315 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1316 | |
1317 | out: | |
1318 | if (rx->sta) | |
1319 | rx->sta->rx_packets++; | |
1320 | if (is_multicast_ether_addr(hdr->addr1)) | |
1321 | rx->local->dot11MulticastReceivedFrameCount++; | |
1322 | else | |
1323 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1324 | return RX_CONTINUE; |
571ecf67 JB |
1325 | } |
1326 | ||
49461622 | 1327 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1328 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1329 | { |
af818581 | 1330 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1331 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1332 | |
358c8d9d | 1333 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1334 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1335 | return RX_CONTINUE; |
571ecf67 | 1336 | |
05c914fe JB |
1337 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1338 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1339 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1340 | |
af818581 JB |
1341 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1342 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1343 | else | |
1344 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1345 | |
9ae54c84 | 1346 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1347 | * count as an dropped frame. */ |
1348 | dev_kfree_skb(rx->skb); | |
1349 | ||
9ae54c84 | 1350 | return RX_QUEUED; |
571ecf67 JB |
1351 | } |
1352 | ||
49461622 | 1353 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1354 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1355 | { |
6e0d114d | 1356 | u8 *data = rx->skb->data; |
238f74a2 | 1357 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1358 | |
238f74a2 | 1359 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1360 | return RX_CONTINUE; |
6e0d114d JB |
1361 | |
1362 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1363 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1364 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1365 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1366 | /* change frame type to non QOS */ |
238f74a2 | 1367 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1368 | |
9ae54c84 | 1369 | return RX_CONTINUE; |
6e0d114d JB |
1370 | } |
1371 | ||
76ee65bf | 1372 | static int |
5cf121c3 | 1373 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1374 | { |
07346f81 | 1375 | if (unlikely(!rx->sta || |
f4ea83dd | 1376 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1377 | return -EACCES; |
571ecf67 | 1378 | |
76ee65bf | 1379 | return 0; |
571ecf67 JB |
1380 | } |
1381 | ||
76ee65bf | 1382 | static int |
358c8d9d | 1383 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1384 | { |
eb9fb5b8 JB |
1385 | struct sk_buff *skb = rx->skb; |
1386 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1387 | ||
3017b80b | 1388 | /* |
7848ba7d JB |
1389 | * Pass through unencrypted frames if the hardware has |
1390 | * decrypted them already. | |
3017b80b | 1391 | */ |
eb9fb5b8 | 1392 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1393 | return 0; |
571ecf67 JB |
1394 | |
1395 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1396 | if (unlikely(!ieee80211_has_protected(fc) && |
1397 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1398 | ieee80211_is_data(fc) && |
b3fc9c6c | 1399 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1400 | return -EACCES; |
f2ca3ea4 JM |
1401 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1402 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1403 | rx->key)) | |
1404 | return -EACCES; | |
1405 | /* BIP does not use Protected field, so need to check MMIE */ | |
f64f9e71 JP |
1406 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
1407 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
f2ca3ea4 JM |
1408 | rx->key)) |
1409 | return -EACCES; | |
1410 | /* | |
1411 | * When using MFP, Action frames are not allowed prior to | |
1412 | * having configured keys. | |
1413 | */ | |
1414 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1415 | ieee80211_is_robust_mgmt_frame( | |
1416 | (struct ieee80211_hdr *) rx->skb->data))) | |
1417 | return -EACCES; | |
1418 | } | |
b3fc9c6c | 1419 | |
76ee65bf | 1420 | return 0; |
571ecf67 JB |
1421 | } |
1422 | ||
76ee65bf | 1423 | static int |
e31a16d6 | 1424 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1425 | { |
eb9fb5b8 JB |
1426 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1427 | struct net_device *dev = sdata->dev; | |
f14543ee FF |
1428 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1429 | ||
9bc383de JB |
1430 | if (ieee80211_has_a4(hdr->frame_control) && |
1431 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1432 | return -1; |
9bc383de JB |
1433 | |
1434 | if (is_multicast_ether_addr(hdr->addr1) && | |
1435 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1436 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1437 | return -1; |
571ecf67 | 1438 | |
e31a16d6 | 1439 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
76ee65bf | 1440 | } |
571ecf67 | 1441 | |
ce3edf6d JB |
1442 | /* |
1443 | * requires that rx->skb is a frame with ethernet header | |
1444 | */ | |
358c8d9d | 1445 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1446 | { |
c97c23e3 | 1447 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1448 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1449 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1450 | ||
1451 | /* | |
1452 | * Allow EAPOL frames to us/the PAE group address regardless | |
1453 | * of whether the frame was encrypted or not. | |
1454 | */ | |
1455 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
eb9fb5b8 | 1456 | (compare_ether_addr(ehdr->h_dest, rx->sdata->dev->dev_addr) == 0 || |
ce3edf6d JB |
1457 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1458 | return true; | |
1459 | ||
1460 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1461 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1462 | return false; |
1463 | ||
1464 | return true; | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * requires that rx->skb is a frame with ethernet header | |
1469 | */ | |
76ee65bf | 1470 | static void |
5cf121c3 | 1471 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1472 | { |
eb9fb5b8 JB |
1473 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1474 | struct net_device *dev = sdata->dev; | |
76ee65bf RR |
1475 | struct ieee80211_local *local = rx->local; |
1476 | struct sk_buff *skb, *xmit_skb; | |
ce3edf6d JB |
1477 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1478 | struct sta_info *dsta; | |
571ecf67 | 1479 | |
76ee65bf RR |
1480 | skb = rx->skb; |
1481 | xmit_skb = NULL; | |
571ecf67 | 1482 | |
05c914fe JB |
1483 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1484 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1485 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
9bc383de JB |
1486 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
1487 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
ce3edf6d JB |
1488 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1489 | /* | |
1490 | * send multicast frames both to higher layers in | |
1491 | * local net stack and back to the wireless medium | |
1492 | */ | |
76ee65bf RR |
1493 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1494 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1495 | printk(KERN_DEBUG "%s: failed to clone " |
1496 | "multicast frame\n", dev->name); | |
1497 | } else { | |
571ecf67 | 1498 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1499 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1500 | /* |
1501 | * The destination station is associated to | |
1502 | * this AP (in this VLAN), so send the frame | |
1503 | * directly to it and do not pass it to local | |
1504 | * net stack. | |
571ecf67 | 1505 | */ |
76ee65bf | 1506 | xmit_skb = skb; |
571ecf67 JB |
1507 | skb = NULL; |
1508 | } | |
571ecf67 JB |
1509 | } |
1510 | } | |
1511 | ||
1512 | if (skb) { | |
d1c3a37c JB |
1513 | int align __maybe_unused; |
1514 | ||
1515 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1516 | /* | |
1517 | * 'align' will only take the values 0 or 2 here | |
1518 | * since all frames are required to be aligned | |
1519 | * to 2-byte boundaries when being passed to | |
1520 | * mac80211. That also explains the __skb_push() | |
1521 | * below. | |
1522 | */ | |
dacb6f1d | 1523 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1524 | if (align) { |
1525 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1526 | dev_kfree_skb(skb); | |
1527 | skb = NULL; | |
1528 | } else { | |
1529 | u8 *data = skb->data; | |
8ce0b589 ZY |
1530 | size_t len = skb_headlen(skb); |
1531 | skb->data -= align; | |
1532 | memmove(skb->data, data, len); | |
1533 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1534 | } |
1535 | } | |
1536 | #endif | |
1537 | ||
1538 | if (skb) { | |
1539 | /* deliver to local stack */ | |
1540 | skb->protocol = eth_type_trans(skb, dev); | |
1541 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1542 | netif_rx(skb); | |
1543 | } | |
571ecf67 JB |
1544 | } |
1545 | ||
76ee65bf | 1546 | if (xmit_skb) { |
571ecf67 | 1547 | /* send to wireless media */ |
f831e909 | 1548 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1549 | skb_reset_network_header(xmit_skb); |
1550 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1551 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1552 | } |
76ee65bf RR |
1553 | } |
1554 | ||
49461622 | 1555 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1556 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1557 | { |
eb9fb5b8 | 1558 | struct net_device *dev = rx->sdata->dev; |
fd4c7f2f | 1559 | struct ieee80211_local *local = rx->local; |
358c8d9d | 1560 | u16 ethertype; |
fd4c7f2f RR |
1561 | u8 *payload; |
1562 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1563 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1564 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1565 | const struct ethhdr *eth; |
1566 | int remaining, err; | |
1567 | u8 dst[ETH_ALEN]; | |
1568 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1569 | |
358c8d9d | 1570 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1571 | return RX_CONTINUE; |
fd4c7f2f | 1572 | |
358c8d9d | 1573 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1574 | return RX_DROP_MONITOR; |
fd4c7f2f | 1575 | |
5cf121c3 | 1576 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1577 | return RX_CONTINUE; |
fd4c7f2f | 1578 | |
e31a16d6 | 1579 | err = __ieee80211_data_to_8023(rx); |
fd4c7f2f | 1580 | if (unlikely(err)) |
e4c26add | 1581 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1582 | |
1583 | skb->dev = dev; | |
1584 | ||
1585 | dev->stats.rx_packets++; | |
1586 | dev->stats.rx_bytes += skb->len; | |
1587 | ||
1588 | /* skip the wrapping header */ | |
1589 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1590 | if (!eth) | |
e4c26add | 1591 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1592 | |
1593 | while (skb != frame) { | |
1594 | u8 padding; | |
1595 | __be16 len = eth->h_proto; | |
1596 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1597 | ||
1598 | remaining = skb->len; | |
1599 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1600 | memcpy(src, eth->h_source, ETH_ALEN); | |
1601 | ||
1602 | padding = ((4 - subframe_len) & 0x3); | |
1603 | /* the last MSDU has no padding */ | |
f4ea83dd | 1604 | if (subframe_len > remaining) |
e4c26add | 1605 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1606 | |
1607 | skb_pull(skb, sizeof(struct ethhdr)); | |
1608 | /* if last subframe reuse skb */ | |
1609 | if (remaining <= subframe_len + padding) | |
1610 | frame = skb; | |
1611 | else { | |
d1c3a37c JB |
1612 | /* |
1613 | * Allocate and reserve two bytes more for payload | |
1614 | * alignment since sizeof(struct ethhdr) is 14. | |
1615 | */ | |
1616 | frame = dev_alloc_skb( | |
1617 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1618 | subframe_len + 2); | |
fd4c7f2f RR |
1619 | |
1620 | if (frame == NULL) | |
e4c26add | 1621 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1622 | |
d1c3a37c JB |
1623 | skb_reserve(frame, |
1624 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1625 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1626 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1627 | ntohs(len)); | |
1628 | ||
1629 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1630 | padding); | |
1631 | if (!eth) { | |
fd4c7f2f | 1632 | dev_kfree_skb(frame); |
e4c26add | 1633 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1634 | } |
1635 | } | |
1636 | ||
ce3edf6d | 1637 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1638 | frame->dev = dev; |
1639 | frame->priority = skb->priority; | |
1640 | rx->skb = frame; | |
1641 | ||
fd4c7f2f RR |
1642 | payload = frame->data; |
1643 | ethertype = (payload[6] << 8) | payload[7]; | |
1644 | ||
1645 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1646 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1647 | compare_ether_addr(payload, | |
1648 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1649 | /* remove RFC1042 or Bridge-Tunnel |
1650 | * encapsulation and replace EtherType */ | |
1651 | skb_pull(frame, 6); | |
1652 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1653 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1654 | } else { | |
ce3edf6d JB |
1655 | memcpy(skb_push(frame, sizeof(__be16)), |
1656 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1657 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1658 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1659 | } | |
1660 | ||
358c8d9d | 1661 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1662 | if (skb == frame) /* last frame */ |
e4c26add | 1663 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1664 | dev_kfree_skb(frame); |
1665 | continue; | |
1666 | } | |
fd4c7f2f RR |
1667 | |
1668 | ieee80211_deliver_skb(rx); | |
1669 | } | |
1670 | ||
9ae54c84 | 1671 | return RX_QUEUED; |
fd4c7f2f RR |
1672 | } |
1673 | ||
bf94e17b | 1674 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1675 | static ieee80211_rx_result |
e32f85f7 LCC |
1676 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1677 | { | |
1678 | struct ieee80211_hdr *hdr; | |
1679 | struct ieee80211s_hdr *mesh_hdr; | |
1680 | unsigned int hdrlen; | |
1681 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1682 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1683 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e32f85f7 LCC |
1684 | |
1685 | hdr = (struct ieee80211_hdr *) skb->data; | |
1686 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1687 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1688 | ||
1689 | if (!ieee80211_is_data(hdr->frame_control)) | |
1690 | return RX_CONTINUE; | |
1691 | ||
1692 | if (!mesh_hdr->ttl) | |
1693 | /* illegal frame */ | |
1694 | return RX_DROP_MONITOR; | |
1695 | ||
43b7b314 | 1696 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1697 | struct mesh_path *mppath; |
43b7b314 JC |
1698 | char *proxied_addr; |
1699 | char *mpp_addr; | |
1700 | ||
1701 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1702 | mpp_addr = hdr->addr3; | |
1703 | proxied_addr = mesh_hdr->eaddr1; | |
1704 | } else { | |
1705 | mpp_addr = hdr->addr4; | |
1706 | proxied_addr = mesh_hdr->eaddr2; | |
1707 | } | |
79617dee | 1708 | |
79617dee | 1709 | rcu_read_lock(); |
43b7b314 | 1710 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1711 | if (!mppath) { |
43b7b314 | 1712 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1713 | } else { |
1714 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1715 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1716 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1717 | spin_unlock_bh(&mppath->state_lock); |
1718 | } | |
1719 | rcu_read_unlock(); | |
1720 | } | |
1721 | ||
3c5772a5 JC |
1722 | /* Frame has reached destination. Don't forward */ |
1723 | if (!is_multicast_ether_addr(hdr->addr1) && | |
eb9fb5b8 | 1724 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1725 | return RX_CONTINUE; |
1726 | ||
1727 | mesh_hdr->ttl--; | |
1728 | ||
1729 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1730 | if (!mesh_hdr->ttl) | |
472dbc45 | 1731 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1732 | dropped_frames_ttl); |
1733 | else { | |
1734 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1735 | struct ieee80211_tx_info *info; |
1736 | ||
e32f85f7 LCC |
1737 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1738 | ||
1739 | if (!fwd_skb && net_ratelimit()) | |
1740 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
eb9fb5b8 | 1741 | sdata->dev->name); |
e32f85f7 LCC |
1742 | |
1743 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
eb9fb5b8 | 1744 | memcpy(fwd_hdr->addr2, sdata->dev->dev_addr, ETH_ALEN); |
3b8d81e0 JB |
1745 | info = IEEE80211_SKB_CB(fwd_skb); |
1746 | memset(info, 0, sizeof(*info)); | |
1747 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1748 | info->control.vif = &rx->sdata->vif; |
3b8d81e0 | 1749 | ieee80211_select_queue(local, fwd_skb); |
c8a61a7d DW |
1750 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1751 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1752 | fwded_mcast); | |
1753 | else { | |
3c5772a5 JC |
1754 | int err; |
1755 | /* | |
1756 | * Save TA to addr1 to send TA a path error if a | |
1757 | * suitable next hop is not found | |
1758 | */ | |
1759 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1760 | ETH_ALEN); |
3c5772a5 | 1761 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1762 | /* Failed to immediately resolve next hop: |
1763 | * fwded frame was dropped or will be added | |
1764 | * later to the pending skb queue. */ | |
1765 | if (err) | |
1766 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1767 | |
1768 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1769 | fwded_unicast); | |
249b405c JC |
1770 | } |
1771 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1772 | fwded_frames); | |
3b8d81e0 | 1773 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1774 | } |
1775 | } | |
1776 | ||
3c5772a5 | 1777 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1778 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1779 | return RX_CONTINUE; |
1780 | else | |
1781 | return RX_DROP_MONITOR; | |
1782 | } | |
bf94e17b | 1783 | #endif |
e32f85f7 | 1784 | |
49461622 | 1785 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1786 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1787 | { |
eb9fb5b8 JB |
1788 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1789 | struct net_device *dev = sdata->dev; | |
358c8d9d HH |
1790 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1791 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1792 | int err; |
76ee65bf | 1793 | |
358c8d9d | 1794 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1795 | return RX_CONTINUE; |
76ee65bf | 1796 | |
358c8d9d | 1797 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1798 | return RX_DROP_MONITOR; |
76ee65bf | 1799 | |
f14543ee FF |
1800 | /* |
1801 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1802 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1803 | */ | |
1804 | if (ieee80211_has_a4(hdr->frame_control) && | |
1805 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1806 | return RX_DROP_MONITOR; | |
1807 | ||
e31a16d6 | 1808 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1809 | if (unlikely(err)) |
e4c26add | 1810 | return RX_DROP_UNUSABLE; |
76ee65bf | 1811 | |
358c8d9d | 1812 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1813 | return RX_DROP_MONITOR; |
ce3edf6d | 1814 | |
76ee65bf RR |
1815 | rx->skb->dev = dev; |
1816 | ||
1817 | dev->stats.rx_packets++; | |
1818 | dev->stats.rx_bytes += rx->skb->len; | |
1819 | ||
1820 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1821 | |
9ae54c84 | 1822 | return RX_QUEUED; |
571ecf67 JB |
1823 | } |
1824 | ||
49461622 | 1825 | static ieee80211_rx_result debug_noinline |
2569a826 | 1826 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
71364716 RR |
1827 | { |
1828 | struct ieee80211_local *local = rx->local; | |
1829 | struct ieee80211_hw *hw = &local->hw; | |
1830 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1831 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1832 | struct tid_ampdu_rx *tid_agg_rx; |
1833 | u16 start_seq_num; | |
1834 | u16 tid; | |
1835 | ||
a7767f95 | 1836 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1837 | return RX_CONTINUE; |
71364716 | 1838 | |
a7767f95 | 1839 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1840 | if (!rx->sta) |
a02ae758 | 1841 | return RX_DROP_MONITOR; |
71364716 | 1842 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1843 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1844 | != HT_AGG_STATE_OPERATIONAL) | |
a02ae758 | 1845 | return RX_DROP_MONITOR; |
cee24a3e | 1846 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1847 | |
1848 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1849 | ||
1850 | /* reset session timer */ | |
20ad19d0 JB |
1851 | if (tid_agg_rx->timeout) |
1852 | mod_timer(&tid_agg_rx->session_timer, | |
1853 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1854 | |
a02ae758 | 1855 | /* release stored frames up to start of BAR */ |
2569a826 JB |
1856 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
1857 | frames); | |
a02ae758 JB |
1858 | kfree_skb(skb); |
1859 | return RX_QUEUED; | |
71364716 RR |
1860 | } |
1861 | ||
9ae54c84 | 1862 | return RX_CONTINUE; |
71364716 RR |
1863 | } |
1864 | ||
f4f727a6 JM |
1865 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1866 | struct ieee80211_mgmt *mgmt, | |
1867 | size_t len) | |
fea14732 JM |
1868 | { |
1869 | struct ieee80211_local *local = sdata->local; | |
1870 | struct sk_buff *skb; | |
1871 | struct ieee80211_mgmt *resp; | |
1872 | ||
1873 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1874 | /* Not to own unicast address */ | |
1875 | return; | |
1876 | } | |
1877 | ||
46900298 JB |
1878 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1879 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1880 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1881 | return; |
1882 | } | |
1883 | ||
1884 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1885 | /* Too short SA Query request frame */ | |
1886 | return; | |
1887 | } | |
1888 | ||
1889 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1890 | if (skb == NULL) | |
1891 | return; | |
1892 | ||
1893 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1894 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1895 | memset(resp, 0, 24); | |
1896 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1897 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1898 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1899 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1900 | IEEE80211_STYPE_ACTION); | |
1901 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1902 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1903 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1904 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1905 | mgmt->u.action.u.sa_query.trans_id, | |
1906 | WLAN_SA_QUERY_TR_ID_LEN); | |
1907 | ||
62ae67be | 1908 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
1909 | } |
1910 | ||
de1ede7a JB |
1911 | static ieee80211_rx_result debug_noinline |
1912 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1913 | { | |
1914 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 1915 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a JB |
1916 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
1917 | int len = rx->skb->len; | |
1918 | ||
1919 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1920 | return RX_CONTINUE; | |
1921 | ||
1922 | if (!rx->sta) | |
1923 | return RX_DROP_MONITOR; | |
1924 | ||
1925 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1926 | return RX_DROP_MONITOR; | |
1927 | ||
97ebe12a JM |
1928 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1929 | return RX_DROP_MONITOR; | |
1930 | ||
de1ede7a JB |
1931 | /* all categories we currently handle have action_code */ |
1932 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1933 | return RX_DROP_MONITOR; | |
1934 | ||
de1ede7a JB |
1935 | switch (mgmt->u.action.category) { |
1936 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1937 | /* |
1938 | * The aggregation code is not prepared to handle | |
1939 | * anything but STA/AP due to the BSSID handling; | |
1940 | * IBSS could work in the code but isn't supported | |
1941 | * by drivers or the standard. | |
1942 | */ | |
1943 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1944 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1945 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1946 | return RX_DROP_MONITOR; | |
1947 | ||
de1ede7a JB |
1948 | switch (mgmt->u.action.u.addba_req.action_code) { |
1949 | case WLAN_ACTION_ADDBA_REQ: | |
1950 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1951 | sizeof(mgmt->u.action.u.addba_req))) | |
1952 | return RX_DROP_MONITOR; | |
1953 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1954 | break; | |
1955 | case WLAN_ACTION_ADDBA_RESP: | |
1956 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1957 | sizeof(mgmt->u.action.u.addba_resp))) | |
1958 | return RX_DROP_MONITOR; | |
1959 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1960 | break; | |
1961 | case WLAN_ACTION_DELBA: | |
1962 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1963 | sizeof(mgmt->u.action.u.delba))) | |
1964 | return RX_DROP_MONITOR; | |
1965 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1966 | break; | |
1967 | } | |
39192c0b JB |
1968 | break; |
1969 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1970 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1971 | return RX_DROP_MONITOR; | |
46900298 JB |
1972 | |
1973 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1974 | return RX_DROP_MONITOR; | |
1975 | ||
39192c0b JB |
1976 | switch (mgmt->u.action.u.measurement.action_code) { |
1977 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1978 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1979 | sizeof(mgmt->u.action.u.measurement))) | |
1980 | return RX_DROP_MONITOR; | |
1981 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1982 | break; | |
c481ec97 S |
1983 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1984 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1985 | sizeof(mgmt->u.action.u.chan_switch))) | |
1986 | return RX_DROP_MONITOR; | |
1987 | ||
cc32abd4 JB |
1988 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1989 | return RX_DROP_MONITOR; | |
1990 | ||
46900298 | 1991 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1992 | return RX_DROP_MONITOR; |
1993 | ||
77fdaa12 | 1994 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1995 | } |
1996 | break; | |
fea14732 JM |
1997 | case WLAN_CATEGORY_SA_QUERY: |
1998 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1999 | sizeof(mgmt->u.action.u.sa_query))) | |
2000 | return RX_DROP_MONITOR; | |
2001 | switch (mgmt->u.action.u.sa_query.action) { | |
2002 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2003 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2004 | return RX_DROP_MONITOR; | |
2005 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
2006 | break; | |
2007 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
2008 | /* | |
2009 | * SA Query response is currently only used in AP mode | |
2010 | * and it is processed in user space. | |
2011 | */ | |
2012 | return RX_CONTINUE; | |
2013 | } | |
2014 | break; | |
39192c0b JB |
2015 | default: |
2016 | return RX_CONTINUE; | |
de1ede7a JB |
2017 | } |
2018 | ||
39192c0b JB |
2019 | rx->sta->rx_packets++; |
2020 | dev_kfree_skb(rx->skb); | |
2021 | return RX_QUEUED; | |
de1ede7a JB |
2022 | } |
2023 | ||
49461622 | 2024 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2025 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2026 | { |
eb9fb5b8 | 2027 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
97ebe12a | 2028 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 2029 | |
5cf121c3 | 2030 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 2031 | return RX_DROP_MONITOR; |
571ecf67 | 2032 | |
97ebe12a JM |
2033 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
2034 | return RX_DROP_MONITOR; | |
2035 | ||
472dbc45 | 2036 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 2037 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 2038 | |
3832c287 | 2039 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 2040 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 2041 | |
7986cf95 | 2042 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 2043 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 2044 | |
7986cf95 | 2045 | return RX_DROP_MONITOR; |
571ecf67 JB |
2046 | } |
2047 | ||
3b8d81e0 | 2048 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2049 | struct ieee80211_rx_data *rx) |
571ecf67 | 2050 | { |
a7767f95 HH |
2051 | int keyidx; |
2052 | unsigned int hdrlen; | |
571ecf67 | 2053 | |
a7767f95 | 2054 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2055 | if (rx->skb->len >= hdrlen + 4) |
2056 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2057 | else | |
2058 | keyidx = -1; | |
2059 | ||
8944b79f | 2060 | if (!rx->sta) { |
aa0daf0e JB |
2061 | /* |
2062 | * Some hardware seem to generate incorrect Michael MIC | |
2063 | * reports; ignore them to avoid triggering countermeasures. | |
2064 | */ | |
af2ced6a | 2065 | return; |
571ecf67 JB |
2066 | } |
2067 | ||
a7767f95 | 2068 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2069 | return; |
571ecf67 | 2070 | |
05c914fe | 2071 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2072 | /* |
2073 | * APs with pairwise keys should never receive Michael MIC | |
2074 | * errors for non-zero keyidx because these are reserved for | |
2075 | * group keys and only the AP is sending real multicast | |
2076 | * frames in the BSS. | |
2077 | */ | |
af2ced6a | 2078 | return; |
571ecf67 JB |
2079 | } |
2080 | ||
a7767f95 HH |
2081 | if (!ieee80211_is_data(hdr->frame_control) && |
2082 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2083 | return; |
571ecf67 | 2084 | |
e6d6e342 JB |
2085 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2086 | GFP_ATOMIC); | |
571ecf67 JB |
2087 | } |
2088 | ||
5cf121c3 | 2089 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2090 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2091 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2092 | { |
2093 | struct ieee80211_sub_if_data *sdata; | |
2094 | struct ieee80211_local *local = rx->local; | |
2095 | struct ieee80211_rtap_hdr { | |
2096 | struct ieee80211_radiotap_header hdr; | |
2097 | u8 flags; | |
5f0b7de5 | 2098 | u8 rate_or_pad; |
3d30d949 MW |
2099 | __le16 chan_freq; |
2100 | __le16 chan_flags; | |
2101 | } __attribute__ ((packed)) *rthdr; | |
2102 | struct sk_buff *skb = rx->skb, *skb2; | |
2103 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2104 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2105 | |
8c0c709e | 2106 | if (status->flag & RX_FLAG_INTERNAL_CMTR) |
3d30d949 MW |
2107 | goto out_free_skb; |
2108 | ||
2109 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
2110 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2111 | goto out_free_skb; | |
2112 | ||
2113 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2114 | memset(rthdr, 0, sizeof(*rthdr)); | |
2115 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2116 | rthdr->hdr.it_present = | |
2117 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2118 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2119 | ||
5f0b7de5 JB |
2120 | if (rate) { |
2121 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2122 | rthdr->hdr.it_present |= | |
2123 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2124 | } | |
3d30d949 MW |
2125 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2126 | ||
2127 | if (status->band == IEEE80211_BAND_5GHZ) | |
2128 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2129 | IEEE80211_CHAN_5GHZ); | |
2130 | else | |
2131 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2132 | IEEE80211_CHAN_2GHZ); | |
2133 | ||
2134 | skb_set_mac_header(skb, 0); | |
2135 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2136 | skb->pkt_type = PACKET_OTHERHOST; | |
2137 | skb->protocol = htons(ETH_P_802_2); | |
2138 | ||
2139 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
2140 | if (!netif_running(sdata->dev)) | |
2141 | continue; | |
2142 | ||
05c914fe | 2143 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2144 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2145 | continue; | |
2146 | ||
2147 | if (prev_dev) { | |
2148 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2149 | if (skb2) { | |
2150 | skb2->dev = prev_dev; | |
2151 | netif_rx(skb2); | |
2152 | } | |
2153 | } | |
2154 | ||
2155 | prev_dev = sdata->dev; | |
2156 | sdata->dev->stats.rx_packets++; | |
2157 | sdata->dev->stats.rx_bytes += skb->len; | |
2158 | } | |
2159 | ||
2160 | if (prev_dev) { | |
2161 | skb->dev = prev_dev; | |
2162 | netif_rx(skb); | |
2163 | skb = NULL; | |
2164 | } else | |
2165 | goto out_free_skb; | |
2166 | ||
8c0c709e | 2167 | status->flag |= RX_FLAG_INTERNAL_CMTR; |
3d30d949 MW |
2168 | return; |
2169 | ||
2170 | out_free_skb: | |
2171 | dev_kfree_skb(skb); | |
2172 | } | |
2173 | ||
571ecf67 | 2174 | |
8944b79f | 2175 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2176 | struct ieee80211_rx_data *rx, |
5f0b7de5 JB |
2177 | struct sk_buff *skb, |
2178 | struct ieee80211_rate *rate) | |
58905290 | 2179 | { |
2569a826 | 2180 | struct sk_buff_head reorder_release; |
58905290 JB |
2181 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2182 | ||
2569a826 JB |
2183 | __skb_queue_head_init(&reorder_release); |
2184 | ||
8944b79f JB |
2185 | rx->skb = skb; |
2186 | rx->sdata = sdata; | |
8944b79f | 2187 | |
e32f85f7 LCC |
2188 | #define CALL_RXH(rxh) \ |
2189 | do { \ | |
2190 | res = rxh(rx); \ | |
2191 | if (res != RX_CONTINUE) \ | |
2569a826 | 2192 | goto rxh_next; \ |
e32f85f7 | 2193 | } while (0); |
49461622 | 2194 | |
2569a826 JB |
2195 | /* |
2196 | * NB: the rxh_next label works even if we jump | |
2197 | * to it from here because then the list will | |
2198 | * be empty, which is a trivial check | |
2199 | */ | |
49461622 JB |
2200 | CALL_RXH(ieee80211_rx_h_passive_scan) |
2201 | CALL_RXH(ieee80211_rx_h_check) | |
2569a826 JB |
2202 | |
2203 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); | |
2204 | ||
2205 | while ((skb = __skb_dequeue(&reorder_release))) { | |
2206 | /* | |
2207 | * all the other fields are valid across frames | |
2208 | * that belong to an aMPDU since they are on the | |
2209 | * same TID from the same station | |
2210 | */ | |
2211 | rx->skb = skb; | |
2212 | ||
2213 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2214 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2215 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2216 | CALL_RXH(ieee80211_rx_h_defragment) | |
2217 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2218 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2219 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2220 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2221 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2222 | #ifdef CONFIG_MAC80211_MESH |
2569a826 JB |
2223 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2224 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2225 | #endif |
2569a826 JB |
2226 | CALL_RXH(ieee80211_rx_h_data) |
2227 | ||
2228 | /* special treatment -- needs the queue */ | |
2229 | res = ieee80211_rx_h_ctrl(rx, &reorder_release); | |
2230 | if (res != RX_CONTINUE) | |
2231 | goto rxh_next; | |
2232 | ||
2233 | CALL_RXH(ieee80211_rx_h_action) | |
2234 | CALL_RXH(ieee80211_rx_h_mgmt) | |
49461622 JB |
2235 | |
2236 | #undef CALL_RXH | |
2237 | ||
2569a826 JB |
2238 | rxh_next: |
2239 | switch (res) { | |
2240 | case RX_DROP_MONITOR: | |
2241 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2242 | if (rx->sta) | |
2243 | rx->sta->rx_dropped++; | |
2244 | /* fall through */ | |
2245 | case RX_CONTINUE: | |
2246 | ieee80211_rx_cooked_monitor(rx, rate); | |
2247 | break; | |
2248 | case RX_DROP_UNUSABLE: | |
2249 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2250 | if (rx->sta) | |
2251 | rx->sta->rx_dropped++; | |
2252 | dev_kfree_skb(rx->skb); | |
2253 | break; | |
2254 | case RX_QUEUED: | |
2255 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2256 | break; | |
2257 | } | |
58905290 JB |
2258 | } |
2259 | } | |
2260 | ||
571ecf67 JB |
2261 | /* main receive path */ |
2262 | ||
23a24def | 2263 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2264 | struct ieee80211_rx_data *rx, |
23a24def JB |
2265 | struct ieee80211_hdr *hdr) |
2266 | { | |
eb9fb5b8 JB |
2267 | struct sk_buff *skb = rx->skb; |
2268 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2269 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2270 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2271 | ||
51fb61e7 | 2272 | switch (sdata->vif.type) { |
05c914fe | 2273 | case NL80211_IFTYPE_STATION: |
9bc383de | 2274 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2275 | return 0; |
77fdaa12 JB |
2276 | if (!multicast && |
2277 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { | |
4150c572 | 2278 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2279 | return 0; |
5cf121c3 | 2280 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2281 | } |
2282 | break; | |
05c914fe | 2283 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2284 | if (!bssid) |
2285 | return 0; | |
a7767f95 | 2286 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2287 | return 1; |
87291c02 | 2288 | } |
46900298 | 2289 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2290 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2291 | return 0; |
5cf121c3 | 2292 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2293 | } else if (!multicast && |
2294 | compare_ether_addr(sdata->dev->dev_addr, | |
2295 | hdr->addr1) != 0) { | |
4150c572 | 2296 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2297 | return 0; |
5cf121c3 | 2298 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2299 | } else if (!rx->sta) { |
2300 | int rate_idx; | |
eb9fb5b8 | 2301 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2302 | rate_idx = 0; /* TODO: HT rates */ |
2303 | else | |
eb9fb5b8 | 2304 | rate_idx = status->rate_idx; |
ab1f5c0b | 2305 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2306 | BIT(rate_idx)); |
2307 | } | |
23a24def | 2308 | break; |
05c914fe | 2309 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2310 | if (!multicast && |
2311 | compare_ether_addr(sdata->dev->dev_addr, | |
2312 | hdr->addr1) != 0) { | |
2313 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2314 | return 0; | |
2315 | ||
5cf121c3 | 2316 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2317 | } |
2318 | break; | |
05c914fe JB |
2319 | case NL80211_IFTYPE_AP_VLAN: |
2320 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2321 | if (!bssid) { |
2322 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2323 | hdr->addr1)) | |
2324 | return 0; | |
2325 | } else if (!ieee80211_bssid_match(bssid, | |
2326 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2327 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2328 | return 0; |
5cf121c3 | 2329 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2330 | } |
23a24def | 2331 | break; |
05c914fe | 2332 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2333 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2334 | return 0; |
2335 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2336 | return 0; | |
2337 | break; | |
05c914fe | 2338 | case NL80211_IFTYPE_MONITOR: |
05c914fe JB |
2339 | case NL80211_IFTYPE_UNSPECIFIED: |
2340 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2341 | /* should never get here */ |
2342 | WARN_ON(1); | |
2343 | break; | |
23a24def JB |
2344 | } |
2345 | ||
2346 | return 1; | |
2347 | } | |
2348 | ||
571ecf67 | 2349 | /* |
6368e4b1 RR |
2350 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2351 | * be called with rcu_read_lock protection. | |
571ecf67 | 2352 | */ |
71ebb4aa RR |
2353 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2354 | struct sk_buff *skb, | |
8318d78a | 2355 | struct ieee80211_rate *rate) |
571ecf67 | 2356 | { |
f1d58c25 | 2357 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2358 | struct ieee80211_local *local = hw_to_local(hw); |
2359 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2360 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2361 | struct ieee80211_rx_data rx; |
6368e4b1 | 2362 | int prepares; |
8e6f0032 JB |
2363 | struct ieee80211_sub_if_data *prev = NULL; |
2364 | struct sk_buff *skb_new; | |
571ecf67 | 2365 | |
358c8d9d | 2366 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2367 | memset(&rx, 0, sizeof(rx)); |
2368 | rx.skb = skb; | |
2369 | rx.local = local; | |
72abd81b | 2370 | |
358c8d9d | 2371 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2372 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2373 | |
142b9f50 HS |
2374 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2375 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2376 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2377 | |
38f3714d | 2378 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2379 | ieee80211_verify_alignment(&rx); |
38f3714d | 2380 | |
af2ced6a | 2381 | rx.sta = sta_info_get(local, hdr->addr2); |
eb9fb5b8 | 2382 | if (rx.sta) |
af2ced6a | 2383 | rx.sdata = rx.sta->sdata; |
571ecf67 | 2384 | |
fbc44bf7 JB |
2385 | if (rx.sdata && ieee80211_is_data(hdr->frame_control)) { |
2386 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2387 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
af2ced6a JB |
2388 | if (prepares) { |
2389 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2390 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2391 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2392 | } else | |
2393 | prev = rx.sdata; | |
2394 | } | |
fbc44bf7 | 2395 | } else list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2396 | if (!netif_running(sdata->dev)) |
2397 | continue; | |
2398 | ||
fbc44bf7 JB |
2399 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2400 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b2e7771e JB |
2401 | continue; |
2402 | ||
5cf121c3 | 2403 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2404 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2405 | |
6368e4b1 | 2406 | if (!prepares) |
23a24def | 2407 | continue; |
8e6f0032 | 2408 | |
af2ced6a JB |
2409 | if (status->flag & RX_FLAG_MMIC_ERROR) { |
2410 | rx.sdata = sdata; | |
2411 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2412 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2413 | continue; | |
2414 | } | |
2415 | ||
340e11f3 JB |
2416 | /* |
2417 | * frame is destined for this interface, but if it's not | |
2418 | * also for the previous one we handle that after the | |
2419 | * loop to avoid copying the SKB once too much | |
2420 | */ | |
2421 | ||
2422 | if (!prev) { | |
2423 | prev = sdata; | |
2424 | continue; | |
8e6f0032 | 2425 | } |
340e11f3 JB |
2426 | |
2427 | /* | |
2428 | * frame was destined for the previous interface | |
2429 | * so invoke RX handlers for it | |
2430 | */ | |
2431 | ||
2432 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2433 | if (!skb_new) { | |
2434 | if (net_ratelimit()) | |
2435 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2436 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2437 | wiphy_name(local->hw.wiphy), |
2438 | prev->dev->name); | |
340e11f3 JB |
2439 | continue; |
2440 | } | |
5f0b7de5 | 2441 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate); |
8e6f0032 | 2442 | prev = sdata; |
571ecf67 | 2443 | } |
a4b7d7bd | 2444 | if (prev) |
5f0b7de5 | 2445 | ieee80211_invoke_rx_handlers(prev, &rx, skb, rate); |
a4b7d7bd | 2446 | else |
8e6f0032 | 2447 | dev_kfree_skb(skb); |
571ecf67 | 2448 | } |
6368e4b1 RR |
2449 | |
2450 | /* | |
2451 | * This is the receive path handler. It is called by a low level driver when an | |
2452 | * 802.11 MPDU is received from the hardware. | |
2453 | */ | |
103bf9f7 | 2454 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2455 | { |
2456 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2457 | struct ieee80211_rate *rate = NULL; |
2458 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2459 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2460 | |
d20ef63d JB |
2461 | WARN_ON_ONCE(softirq_count() == 0); |
2462 | ||
77a980dc JB |
2463 | if (WARN_ON(status->band < 0 || |
2464 | status->band >= IEEE80211_NUM_BANDS)) | |
2465 | goto drop; | |
8318d78a JB |
2466 | |
2467 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2468 | if (WARN_ON(!sband)) |
2469 | goto drop; | |
8318d78a | 2470 | |
89c3a8ac JB |
2471 | /* |
2472 | * If we're suspending, it is possible although not too likely | |
2473 | * that we'd be receiving frames after having already partially | |
2474 | * quiesced the stack. We can't process such frames then since | |
2475 | * that might, for example, cause stations to be added or other | |
2476 | * driver callbacks be invoked. | |
2477 | */ | |
77a980dc JB |
2478 | if (unlikely(local->quiescing || local->suspended)) |
2479 | goto drop; | |
89c3a8ac | 2480 | |
ea77f12f JB |
2481 | /* |
2482 | * The same happens when we're not even started, | |
2483 | * but that's worth a warning. | |
2484 | */ | |
77a980dc JB |
2485 | if (WARN_ON(!local->started)) |
2486 | goto drop; | |
ea77f12f | 2487 | |
0fb8ca45 | 2488 | if (status->flag & RX_FLAG_HT) { |
e5d6eb83 LR |
2489 | /* |
2490 | * rate_idx is MCS index, which can be [0-76] as documented on: | |
2491 | * | |
2492 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2493 | * | |
2494 | * Anything else would be some sort of driver or hardware error. | |
2495 | * The driver should catch hardware errors. | |
2496 | */ | |
2497 | if (WARN((status->rate_idx < 0 || | |
2498 | status->rate_idx > 76), | |
2499 | "Rate marked as an HT rate but passed " | |
2500 | "status->rate_idx is not " | |
2501 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2502 | status->rate_idx, | |
2503 | status->rate_idx)) | |
77a980dc | 2504 | goto drop; |
0fb8ca45 JM |
2505 | } else { |
2506 | if (WARN_ON(status->rate_idx < 0 || | |
2507 | status->rate_idx >= sband->n_bitrates)) | |
77a980dc | 2508 | goto drop; |
0fb8ca45 JM |
2509 | rate = &sband->bitrates[status->rate_idx]; |
2510 | } | |
6368e4b1 RR |
2511 | |
2512 | /* | |
2513 | * key references and virtual interfaces are protected using RCU | |
2514 | * and this requires that we are in a read-side RCU section during | |
2515 | * receive processing | |
2516 | */ | |
2517 | rcu_read_lock(); | |
2518 | ||
2519 | /* | |
2520 | * Frames with failed FCS/PLCP checksum are not returned, | |
2521 | * all other frames are returned without radiotap header | |
2522 | * if it was previously present. | |
2523 | * Also, frames with less than 16 bytes are dropped. | |
2524 | */ | |
f1d58c25 | 2525 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2526 | if (!skb) { |
2527 | rcu_read_unlock(); | |
2528 | return; | |
2529 | } | |
2530 | ||
2569a826 | 2531 | __ieee80211_rx_handle_packet(hw, skb, rate); |
6368e4b1 RR |
2532 | |
2533 | rcu_read_unlock(); | |
77a980dc JB |
2534 | |
2535 | return; | |
2536 | drop: | |
2537 | kfree_skb(skb); | |
6368e4b1 | 2538 | } |
103bf9f7 | 2539 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2540 | |
2541 | /* This is a version of the rx handler that can be called from hard irq | |
2542 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2543 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2544 | { |
2545 | struct ieee80211_local *local = hw_to_local(hw); | |
2546 | ||
2547 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2548 | ||
571ecf67 JB |
2549 | skb->pkt_type = IEEE80211_RX_MSG; |
2550 | skb_queue_tail(&local->skb_queue, skb); | |
2551 | tasklet_schedule(&local->tasklet); | |
2552 | } | |
2553 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |