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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> | |
84040805 | 5 | * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> |
571ecf67 JB |
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> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
571ecf67 JB |
14 | #include <linux/kernel.h> |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/etherdevice.h> | |
d4e46a3d | 18 | #include <linux/rcupdate.h> |
571ecf67 JB |
19 | #include <net/mac80211.h> |
20 | #include <net/ieee80211_radiotap.h> | |
21 | ||
22 | #include "ieee80211_i.h" | |
24487981 | 23 | #include "driver-ops.h" |
2c8dccc7 | 24 | #include "led.h" |
33b64eb2 | 25 | #include "mesh.h" |
571ecf67 JB |
26 | #include "wep.h" |
27 | #include "wpa.h" | |
28 | #include "tkip.h" | |
29 | #include "wme.h" | |
30 | ||
b2e7771e JB |
31 | /* |
32 | * monitor mode reception | |
33 | * | |
34 | * This function cleans up the SKB, i.e. it removes all the stuff | |
35 | * only useful for monitoring. | |
36 | */ | |
37 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 38 | struct sk_buff *skb) |
b2e7771e | 39 | { |
b2e7771e JB |
40 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
41 | if (likely(skb->len > FCS_LEN)) | |
e3cf8b3f | 42 | __pskb_trim(skb, skb->len - FCS_LEN); |
b2e7771e JB |
43 | else { |
44 | /* driver bug */ | |
45 | WARN_ON(1); | |
46 | dev_kfree_skb(skb); | |
47 | skb = NULL; | |
48 | } | |
49 | } | |
50 | ||
51 | return skb; | |
52 | } | |
53 | ||
f1d58c25 | 54 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 55 | int present_fcs_len) |
b2e7771e | 56 | { |
f1d58c25 | 57 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 58 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
59 | |
60 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
61 | return 1; | |
0869aea0 | 62 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 63 | return 1; |
87228f57 HH |
64 | if (ieee80211_is_ctl(hdr->frame_control) && |
65 | !ieee80211_is_pspoll(hdr->frame_control) && | |
66 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
67 | return 1; |
68 | return 0; | |
69 | } | |
70 | ||
601ae7f2 BR |
71 | static int |
72 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
73 | struct ieee80211_rx_status *status) | |
74 | { | |
75 | int len; | |
76 | ||
77 | /* always present fields */ | |
78 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
79 | ||
80 | if (status->flag & RX_FLAG_TSFT) | |
81 | len += 8; | |
7fee5372 | 82 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 | 83 | len += 1; |
601ae7f2 BR |
84 | |
85 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
86 | len++; | |
87 | ||
601ae7f2 BR |
88 | return len; |
89 | } | |
90 | ||
d1c3a37c | 91 | /* |
601ae7f2 BR |
92 | * ieee80211_add_rx_radiotap_header - add radiotap header |
93 | * | |
94 | * add a radiotap header containing all the fields which the hardware provided. | |
95 | */ | |
96 | static void | |
97 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
98 | struct sk_buff *skb, | |
601ae7f2 BR |
99 | struct ieee80211_rate *rate, |
100 | int rtap_len) | |
101 | { | |
f1d58c25 | 102 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
103 | struct ieee80211_radiotap_header *rthdr; |
104 | unsigned char *pos; | |
6a86b9c7 | 105 | u16 rx_flags = 0; |
601ae7f2 BR |
106 | |
107 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
108 | memset(rthdr, 0, rtap_len); | |
109 | ||
110 | /* radiotap header, set always present flags */ | |
111 | rthdr->it_present = | |
112 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
113 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
114 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
115 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
116 | rthdr->it_len = cpu_to_le16(rtap_len); | |
117 | ||
118 | pos = (unsigned char *)(rthdr+1); | |
119 | ||
120 | /* the order of the following fields is important */ | |
121 | ||
122 | /* IEEE80211_RADIOTAP_TSFT */ | |
123 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 124 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
125 | rthdr->it_present |= |
126 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
127 | pos += 8; | |
128 | } | |
129 | ||
130 | /* IEEE80211_RADIOTAP_FLAGS */ | |
131 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
132 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
133 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
134 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
135 | if (status->flag & RX_FLAG_SHORTPRE) |
136 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
137 | pos++; |
138 | ||
139 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
140 | if (status->flag & RX_FLAG_HT) { |
141 | /* | |
142 | * TODO: add following information into radiotap header once | |
143 | * suitable fields are defined for it: | |
144 | * - MCS index (status->rate_idx) | |
145 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
146 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
147 | */ | |
148 | *pos = 0; | |
8d6f658e | 149 | } else { |
ebe6c7ba | 150 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 151 | *pos = rate->bitrate / 5; |
8d6f658e | 152 | } |
601ae7f2 BR |
153 | pos++; |
154 | ||
155 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 156 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
157 | pos += 2; |
158 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
159 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
160 | pos); | |
5f0b7de5 JB |
161 | else if (status->flag & RX_FLAG_HT) |
162 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
163 | pos); | |
9deb1ae5 | 164 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
165 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
166 | pos); | |
601ae7f2 | 167 | else |
6a86b9c7 JB |
168 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
169 | pos); | |
601ae7f2 BR |
170 | pos += 2; |
171 | ||
172 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
173 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
174 | *pos = status->signal; | |
175 | rthdr->it_present |= | |
176 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
177 | pos++; | |
178 | } | |
179 | ||
601ae7f2 BR |
180 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
181 | ||
182 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
183 | *pos = status->antenna; | |
184 | pos++; | |
185 | ||
601ae7f2 BR |
186 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
187 | ||
188 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
189 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 190 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 191 | pos++; |
aae89831 | 192 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
193 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
194 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
195 | pos += 2; |
196 | } | |
197 | ||
b2e7771e JB |
198 | /* |
199 | * This function copies a received frame to all monitor interfaces and | |
200 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
201 | * radiotap header the driver might have added. | |
202 | */ | |
203 | static struct sk_buff * | |
204 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 205 | struct ieee80211_rate *rate) |
b2e7771e | 206 | { |
f1d58c25 | 207 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 208 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 209 | int needed_headroom = 0; |
b2e7771e JB |
210 | struct sk_buff *skb, *skb2; |
211 | struct net_device *prev_dev = NULL; | |
212 | int present_fcs_len = 0; | |
b2e7771e JB |
213 | |
214 | /* | |
215 | * First, we may need to make a copy of the skb because | |
216 | * (1) we need to modify it for radiotap (if not present), and | |
217 | * (2) the other RX handlers will modify the skb we got. | |
218 | * | |
219 | * We don't need to, of course, if we aren't going to return | |
220 | * the SKB because it has a bad FCS/PLCP checksum. | |
221 | */ | |
0869aea0 JB |
222 | |
223 | /* room for the radiotap header based on driver features */ | |
224 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
225 | |
226 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
227 | present_fcs_len = FCS_LEN; | |
228 | ||
e3cf8b3f ZY |
229 | /* make sure hdr->frame_control is on the linear part */ |
230 | if (!pskb_may_pull(origskb, 2)) { | |
231 | dev_kfree_skb(origskb); | |
232 | return NULL; | |
233 | } | |
234 | ||
b2e7771e | 235 | if (!local->monitors) { |
0869aea0 | 236 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
237 | dev_kfree_skb(origskb); |
238 | return NULL; | |
239 | } | |
240 | ||
0869aea0 | 241 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
242 | } |
243 | ||
0869aea0 | 244 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
245 | /* only need to expand headroom if necessary */ |
246 | skb = origskb; | |
247 | origskb = NULL; | |
248 | ||
249 | /* | |
250 | * This shouldn't trigger often because most devices have an | |
251 | * RX header they pull before we get here, and that should | |
252 | * be big enough for our radiotap information. We should | |
253 | * probably export the length to drivers so that we can have | |
254 | * them allocate enough headroom to start with. | |
255 | */ | |
256 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 257 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
258 | dev_kfree_skb(skb); |
259 | return NULL; | |
260 | } | |
261 | } else { | |
262 | /* | |
263 | * Need to make a copy and possibly remove radiotap header | |
264 | * and FCS from the original. | |
265 | */ | |
266 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
267 | ||
0869aea0 | 268 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
269 | |
270 | if (!skb) | |
271 | return origskb; | |
272 | } | |
273 | ||
0869aea0 JB |
274 | /* prepend radiotap information */ |
275 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 276 | |
ce3edf6d | 277 | skb_reset_mac_header(skb); |
b2e7771e JB |
278 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
279 | skb->pkt_type = PACKET_OTHERHOST; | |
280 | skb->protocol = htons(ETH_P_802_2); | |
281 | ||
282 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 283 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
284 | continue; |
285 | ||
3d30d949 MW |
286 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
287 | continue; | |
288 | ||
9607e6b6 | 289 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
290 | continue; |
291 | ||
b2e7771e JB |
292 | if (prev_dev) { |
293 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
294 | if (skb2) { | |
295 | skb2->dev = prev_dev; | |
296 | netif_rx(skb2); | |
297 | } | |
298 | } | |
299 | ||
300 | prev_dev = sdata->dev; | |
301 | sdata->dev->stats.rx_packets++; | |
302 | sdata->dev->stats.rx_bytes += skb->len; | |
303 | } | |
304 | ||
305 | if (prev_dev) { | |
306 | skb->dev = prev_dev; | |
307 | netif_rx(skb); | |
308 | } else | |
309 | dev_kfree_skb(skb); | |
310 | ||
311 | return origskb; | |
312 | } | |
313 | ||
314 | ||
5cf121c3 | 315 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 316 | { |
238f74a2 | 317 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
318 | int tid; |
319 | ||
320 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
321 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
322 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 323 | /* frame has qos control */ |
238f74a2 HH |
324 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
325 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 326 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 327 | else |
5cf121c3 | 328 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 329 | } else { |
1411f9b5 JB |
330 | /* |
331 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
332 | * | |
333 | * Sequence numbers for management frames, QoS data | |
334 | * frames with a broadcast/multicast address in the | |
335 | * Address 1 field, and all non-QoS data frames sent | |
336 | * by QoS STAs are assigned using an additional single | |
337 | * modulo-4096 counter, [...] | |
338 | * | |
339 | * We also use that counter for non-QoS STAs. | |
340 | */ | |
341 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 342 | } |
52865dfd | 343 | |
5cf121c3 | 344 | rx->queue = tid; |
6e0d114d JB |
345 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
346 | * For now, set skb->priority to 0 for other cases. */ | |
347 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 348 | } |
6e0d114d | 349 | |
d1c3a37c JB |
350 | /** |
351 | * DOC: Packet alignment | |
352 | * | |
353 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
354 | * to the stack. | |
355 | * | |
356 | * Additionally, should, if possible, align the payload data in a way that | |
357 | * guarantees that the contained IP header is aligned to a four-byte | |
358 | * boundary. In the case of regular frames, this simply means aligning the | |
359 | * payload to a four-byte boundary (because either the IP header is directly | |
360 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
361 | * in front of it). If the payload data is not properly aligned and the |
362 | * architecture doesn't support efficient unaligned operations, mac80211 | |
363 | * will align the data. | |
d1c3a37c JB |
364 | * |
365 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
366 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
367 | * push the IP header further back to a multiple of four again. Thankfully, the | |
368 | * specs were sane enough this time around to require padding each A-MSDU | |
369 | * subframe to a length that is a multiple of four. | |
370 | * | |
371 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
372 | * the payload is not supported, the driver is required to move the 802.11 | |
373 | * header to be directly in front of the payload in that case. | |
374 | */ | |
375 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 376 | { |
59d9cb07 KV |
377 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
378 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
379 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 380 | #endif |
6e0d114d JB |
381 | } |
382 | ||
6368e4b1 | 383 | |
571ecf67 JB |
384 | /* rx handlers */ |
385 | ||
49461622 | 386 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 387 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
388 | { |
389 | struct ieee80211_local *local = rx->local; | |
390 | struct sk_buff *skb = rx->skb; | |
391 | ||
fbe9c429 | 392 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 393 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 394 | |
142b9f50 HS |
395 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
396 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 397 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 398 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 399 | dev_kfree_skb(skb); |
9ae54c84 | 400 | return RX_QUEUED; |
571ecf67 JB |
401 | } |
402 | ||
5cf121c3 | 403 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
404 | /* scanning finished during invoking of handlers */ |
405 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 406 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
407 | } |
408 | ||
9ae54c84 | 409 | return RX_CONTINUE; |
571ecf67 JB |
410 | } |
411 | ||
3cfcf6ac JM |
412 | |
413 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
414 | { | |
415 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
416 | ||
417 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
418 | return 0; | |
419 | ||
420 | return ieee80211_is_robust_mgmt_frame(hdr); | |
421 | } | |
422 | ||
423 | ||
424 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
425 | { | |
426 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
427 | ||
428 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
429 | return 0; | |
430 | ||
431 | return ieee80211_is_robust_mgmt_frame(hdr); | |
432 | } | |
433 | ||
434 | ||
435 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
436 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
437 | { | |
438 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
439 | struct ieee80211_mmie *mmie; | |
440 | ||
441 | if (skb->len < 24 + sizeof(*mmie) || | |
442 | !is_multicast_ether_addr(hdr->da)) | |
443 | return -1; | |
444 | ||
445 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
446 | return -1; /* not a robust management frame */ | |
447 | ||
448 | mmie = (struct ieee80211_mmie *) | |
449 | (skb->data + skb->len - sizeof(*mmie)); | |
450 | if (mmie->element_id != WLAN_EID_MMIE || | |
451 | mmie->length != sizeof(*mmie) - 2) | |
452 | return -1; | |
453 | ||
454 | return le16_to_cpu(mmie->key_id); | |
455 | } | |
456 | ||
457 | ||
33b64eb2 | 458 | static ieee80211_rx_result |
5cf121c3 | 459 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 460 | { |
a7767f95 HH |
461 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
462 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 463 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 464 | |
a7767f95 | 465 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
466 | if (is_multicast_ether_addr(hdr->addr1)) { |
467 | if (ieee80211_has_tods(hdr->frame_control) || | |
468 | !ieee80211_has_fromds(hdr->frame_control)) | |
469 | return RX_DROP_MONITOR; | |
470 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
471 | return RX_DROP_MONITOR; | |
472 | } else { | |
473 | if (!ieee80211_has_a4(hdr->frame_control)) | |
474 | return RX_DROP_MONITOR; | |
475 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
476 | return RX_DROP_MONITOR; | |
477 | } | |
33b64eb2 LCC |
478 | } |
479 | ||
480 | /* If there is not an established peer link and this is not a peer link | |
481 | * establisment frame, beacon or probe, drop the frame. | |
482 | */ | |
483 | ||
b4e08ea1 | 484 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 485 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 486 | |
a7767f95 | 487 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
488 | return RX_DROP_MONITOR; |
489 | ||
a7767f95 | 490 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 491 | mgmt = (struct ieee80211_mgmt *)hdr; |
97ad9139 | 492 | if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK) |
33b64eb2 | 493 | return RX_DROP_MONITOR; |
33b64eb2 | 494 | return RX_CONTINUE; |
33b64eb2 LCC |
495 | } |
496 | ||
a7767f95 HH |
497 | if (ieee80211_is_probe_req(hdr->frame_control) || |
498 | ieee80211_is_probe_resp(hdr->frame_control) || | |
499 | ieee80211_is_beacon(hdr->frame_control)) | |
500 | return RX_CONTINUE; | |
501 | ||
502 | return RX_DROP_MONITOR; | |
503 | ||
504 | } | |
505 | ||
506 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
507 | ||
508 | if (ieee80211_is_data(hdr->frame_control) && | |
509 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 510 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 511 | return RX_DROP_MONITOR; |
902acc78 | 512 | #undef msh_h_get |
d6d1a5a7 | 513 | |
902acc78 JB |
514 | return RX_CONTINUE; |
515 | } | |
33b64eb2 | 516 | |
1edfb1af JB |
517 | #define SEQ_MODULO 0x1000 |
518 | #define SEQ_MASK 0xfff | |
519 | ||
520 | static inline int seq_less(u16 sq1, u16 sq2) | |
521 | { | |
522 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
523 | } | |
524 | ||
525 | static inline u16 seq_inc(u16 sq) | |
526 | { | |
527 | return (sq + 1) & SEQ_MASK; | |
528 | } | |
529 | ||
530 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
531 | { | |
532 | return (sq1 - sq2) & SEQ_MASK; | |
533 | } | |
534 | ||
535 | ||
536 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
537 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
538 | int index, |
539 | struct sk_buff_head *frames) | |
1edfb1af JB |
540 | { |
541 | struct ieee80211_supported_band *sband; | |
542 | struct ieee80211_rate *rate = NULL; | |
543 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; | |
544 | struct ieee80211_rx_status *status; | |
545 | ||
546 | if (!skb) | |
547 | goto no_frame; | |
548 | ||
549 | status = IEEE80211_SKB_RXCB(skb); | |
550 | ||
551 | /* release the reordered frames to stack */ | |
552 | sband = hw->wiphy->bands[status->band]; | |
553 | if (!(status->flag & RX_FLAG_HT)) | |
554 | rate = &sband->bitrates[status->rate_idx]; | |
1edfb1af JB |
555 | tid_agg_rx->stored_mpdu_num--; |
556 | tid_agg_rx->reorder_buf[index] = NULL; | |
d29cecda | 557 | __skb_queue_tail(frames, skb); |
1edfb1af JB |
558 | |
559 | no_frame: | |
560 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
561 | } | |
562 | ||
563 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
564 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
565 | u16 head_seq_num, |
566 | struct sk_buff_head *frames) | |
1edfb1af JB |
567 | { |
568 | int index; | |
569 | ||
570 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
571 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
572 | tid_agg_rx->buf_size; | |
2569a826 | 573 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
574 | } |
575 | } | |
576 | ||
577 | /* | |
578 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
579 | * the skb was added to the buffer longer than this time ago, the earlier | |
580 | * frames that have not yet been received are assumed to be lost and the skb | |
581 | * can be released for processing. This may also release other skb's from the | |
582 | * reorder buffer if there are no additional gaps between the frames. | |
583 | */ | |
584 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
585 | ||
586 | /* | |
587 | * As this function belongs to the RX path it must be under | |
588 | * rcu_read_lock protection. It returns false if the frame | |
589 | * can be processed immediately, true if it was consumed. | |
590 | */ | |
591 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
592 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
593 | struct sk_buff *skb, |
594 | struct sk_buff_head *frames) | |
1edfb1af JB |
595 | { |
596 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
597 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
598 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
599 | u16 head_seq_num, buf_size; | |
600 | int index; | |
601 | ||
602 | buf_size = tid_agg_rx->buf_size; | |
603 | head_seq_num = tid_agg_rx->head_seq_num; | |
604 | ||
605 | /* frame with out of date sequence number */ | |
606 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
607 | dev_kfree_skb(skb); | |
608 | return true; | |
609 | } | |
610 | ||
611 | /* | |
612 | * If frame the sequence number exceeds our buffering window | |
613 | * size release some previous frames to make room for this one. | |
614 | */ | |
615 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
616 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
617 | /* release stored frames up to new head to stack */ | |
2569a826 JB |
618 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
619 | frames); | |
1edfb1af JB |
620 | } |
621 | ||
622 | /* Now the new frame is always in the range of the reordering buffer */ | |
623 | ||
624 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
625 | ||
626 | /* check if we already stored this frame */ | |
627 | if (tid_agg_rx->reorder_buf[index]) { | |
628 | dev_kfree_skb(skb); | |
629 | return true; | |
630 | } | |
631 | ||
632 | /* | |
633 | * If the current MPDU is in the right order and nothing else | |
634 | * is stored we can process it directly, no need to buffer it. | |
635 | */ | |
636 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
637 | tid_agg_rx->stored_mpdu_num == 0) { | |
638 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
639 | return false; | |
640 | } | |
641 | ||
642 | /* put the frame in the reordering buffer */ | |
643 | tid_agg_rx->reorder_buf[index] = skb; | |
644 | tid_agg_rx->reorder_time[index] = jiffies; | |
645 | tid_agg_rx->stored_mpdu_num++; | |
646 | /* release the buffer until next missing frame */ | |
647 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
648 | tid_agg_rx->buf_size; | |
649 | if (!tid_agg_rx->reorder_buf[index] && | |
650 | tid_agg_rx->stored_mpdu_num > 1) { | |
651 | /* | |
652 | * No buffers ready to be released, but check whether any | |
653 | * frames in the reorder buffer have timed out. | |
654 | */ | |
655 | int j; | |
656 | int skipped = 1; | |
657 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
658 | j = (j + 1) % tid_agg_rx->buf_size) { | |
659 | if (!tid_agg_rx->reorder_buf[j]) { | |
660 | skipped++; | |
661 | continue; | |
662 | } | |
663 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
664 | HT_RX_REORDER_BUF_TIMEOUT)) | |
665 | break; | |
666 | ||
667 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
668 | if (net_ratelimit()) | |
669 | printk(KERN_DEBUG "%s: release an RX reorder " | |
670 | "frame due to timeout on earlier " | |
671 | "frames\n", | |
672 | wiphy_name(hw->wiphy)); | |
673 | #endif | |
2569a826 JB |
674 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
675 | j, frames); | |
1edfb1af JB |
676 | |
677 | /* | |
678 | * Increment the head seq# also for the skipped slots. | |
679 | */ | |
680 | tid_agg_rx->head_seq_num = | |
681 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
682 | skipped = 0; | |
683 | } | |
684 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2569a826 | 685 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
686 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
687 | tid_agg_rx->buf_size; | |
688 | } | |
689 | ||
690 | return true; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
695 | * true if the MPDU was buffered, false if it should be processed. | |
696 | */ | |
2569a826 JB |
697 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
698 | struct sk_buff_head *frames) | |
1edfb1af | 699 | { |
2569a826 JB |
700 | struct sk_buff *skb = rx->skb; |
701 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
702 | struct ieee80211_hw *hw = &local->hw; |
703 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 704 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
705 | struct tid_ampdu_rx *tid_agg_rx; |
706 | u16 sc; | |
707 | int tid; | |
708 | ||
709 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 710 | goto dont_reorder; |
1edfb1af JB |
711 | |
712 | /* | |
713 | * filter the QoS data rx stream according to | |
714 | * STA/TID and check if this STA/TID is on aggregation | |
715 | */ | |
716 | ||
1edfb1af | 717 | if (!sta) |
2569a826 | 718 | goto dont_reorder; |
1edfb1af JB |
719 | |
720 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
721 | ||
54297e4d JB |
722 | spin_lock(&sta->lock); |
723 | ||
098a6070 | 724 | if (!sta->ampdu_mlme.tid_active_rx[tid]) |
54297e4d | 725 | goto dont_reorder_unlock; |
1edfb1af JB |
726 | |
727 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
728 | ||
729 | /* qos null data frames are excluded */ | |
730 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
54297e4d | 731 | goto dont_reorder_unlock; |
1edfb1af JB |
732 | |
733 | /* new, potentially un-ordered, ampdu frame - process it */ | |
734 | ||
735 | /* reset session timer */ | |
736 | if (tid_agg_rx->timeout) | |
737 | mod_timer(&tid_agg_rx->session_timer, | |
738 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
739 | ||
740 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
741 | sc = le16_to_cpu(hdr->seq_ctrl); | |
742 | if (sc & IEEE80211_SCTL_FRAG) { | |
54297e4d | 743 | spin_unlock(&sta->lock); |
66b0470a JB |
744 | __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, |
745 | WLAN_REASON_QSTA_REQUIRE_SETUP); | |
1edfb1af | 746 | dev_kfree_skb(skb); |
2569a826 | 747 | return; |
1edfb1af JB |
748 | } |
749 | ||
54297e4d JB |
750 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) { |
751 | spin_unlock(&sta->lock); | |
2569a826 | 752 | return; |
54297e4d | 753 | } |
2569a826 | 754 | |
54297e4d JB |
755 | dont_reorder_unlock: |
756 | spin_unlock(&sta->lock); | |
2569a826 JB |
757 | dont_reorder: |
758 | __skb_queue_tail(frames, skb); | |
1edfb1af | 759 | } |
33b64eb2 | 760 | |
49461622 | 761 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 762 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 763 | { |
a7767f95 | 764 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
765 | |
766 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
767 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 768 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 769 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 770 | hdr->seq_ctrl)) { |
5cf121c3 | 771 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
772 | rx->local->dot11FrameDuplicateCount++; |
773 | rx->sta->num_duplicates++; | |
774 | } | |
e4c26add | 775 | return RX_DROP_MONITOR; |
571ecf67 | 776 | } else |
5cf121c3 | 777 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
778 | } |
779 | ||
571ecf67 JB |
780 | if (unlikely(rx->skb->len < 16)) { |
781 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 782 | return RX_DROP_MONITOR; |
571ecf67 JB |
783 | } |
784 | ||
571ecf67 JB |
785 | /* Drop disallowed frame classes based on STA auth/assoc state; |
786 | * IEEE 802.11, Chap 5.5. | |
787 | * | |
ccd7b362 JB |
788 | * mac80211 filters only based on association state, i.e. it drops |
789 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
790 | * deauth/disassoc frames when needed. In addition, hostapd is |
791 | * responsible for filtering on both auth and assoc states. | |
792 | */ | |
33b64eb2 | 793 | |
902acc78 | 794 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 795 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 796 | |
a7767f95 HH |
797 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
798 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 799 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 800 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
801 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
802 | !ieee80211_has_tods(hdr->frame_control) && | |
803 | ieee80211_is_data(hdr->frame_control)) || | |
804 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
805 | /* Drop IBSS frames and frames for other hosts |
806 | * silently. */ | |
e4c26add | 807 | return RX_DROP_MONITOR; |
571ecf67 JB |
808 | } |
809 | ||
e4c26add | 810 | return RX_DROP_MONITOR; |
571ecf67 JB |
811 | } |
812 | ||
9ae54c84 | 813 | return RX_CONTINUE; |
570bd537 JB |
814 | } |
815 | ||
816 | ||
49461622 | 817 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 818 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 819 | { |
eb9fb5b8 JB |
820 | struct sk_buff *skb = rx->skb; |
821 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
822 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
823 | int keyidx; |
824 | int hdrlen; | |
e4c26add | 825 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 826 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 827 | int mmie_keyidx = -1; |
570bd537 | 828 | |
3017b80b JB |
829 | /* |
830 | * Key selection 101 | |
831 | * | |
3cfcf6ac | 832 | * There are four types of keys: |
3017b80b | 833 | * - GTK (group keys) |
3cfcf6ac | 834 | * - IGTK (group keys for management frames) |
3017b80b JB |
835 | * - PTK (pairwise keys) |
836 | * - STK (station-to-station pairwise keys) | |
837 | * | |
838 | * When selecting a key, we have to distinguish between multicast | |
839 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
840 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
841 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
842 | * unicast frames can also use key indices like GTKs. Hence, if we | |
843 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 844 | * |
8dc06a1c JB |
845 | * Note that in a regular BSS, multicast frames are sent by the |
846 | * AP only, associated stations unicast the frame to the AP first | |
847 | * which then multicasts it on their behalf. | |
848 | * | |
3017b80b JB |
849 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
850 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
851 | * The spec seems to expect that one negotiates the same key with |
852 | * every station but there's no such requirement; VLANs could be | |
853 | * possible. | |
3017b80b JB |
854 | */ |
855 | ||
3017b80b | 856 | /* |
1990af8d | 857 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
858 | * addressed to us nor a multicast frame. |
859 | */ | |
5cf121c3 | 860 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 861 | return RX_CONTINUE; |
3017b80b | 862 | |
2569a826 JB |
863 | /* start without a key */ |
864 | rx->key = NULL; | |
865 | ||
d4e46a3d JB |
866 | if (rx->sta) |
867 | stakey = rcu_dereference(rx->sta->key); | |
868 | ||
0c7c10c7 JM |
869 | if (!ieee80211_has_protected(hdr->frame_control)) |
870 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
871 | ||
d4e46a3d JB |
872 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
873 | rx->key = stakey; | |
0c7c10c7 JM |
874 | /* Skip decryption if the frame is not protected. */ |
875 | if (!ieee80211_has_protected(hdr->frame_control)) | |
876 | return RX_CONTINUE; | |
3cfcf6ac JM |
877 | } else if (mmie_keyidx >= 0) { |
878 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
879 | if ((status->flag & RX_FLAG_DECRYPTED) && |
880 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
881 | return RX_CONTINUE; |
882 | ||
883 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
884 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
885 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
886 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
887 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
888 | /* | |
889 | * The frame was not protected, so skip decryption. However, we | |
890 | * need to set rx->key if there is a key that could have been | |
891 | * used so that the frame may be dropped if encryption would | |
892 | * have been expected. | |
893 | */ | |
894 | struct ieee80211_key *key = NULL; | |
895 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
896 | is_multicast_ether_addr(hdr->addr1) && | |
897 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
898 | rx->key = key; | |
899 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
900 | rx->key = key; | |
901 | return RX_CONTINUE; | |
571ecf67 | 902 | } else { |
39184b15 | 903 | u8 keyid; |
3017b80b JB |
904 | /* |
905 | * The device doesn't give us the IV so we won't be | |
906 | * able to look up the key. That's ok though, we | |
907 | * don't need to decrypt the frame, we just won't | |
908 | * be able to keep statistics accurate. | |
909 | * Except for key threshold notifications, should | |
910 | * we somehow allow the driver to tell us which key | |
911 | * the hardware used if this flag is set? | |
912 | */ | |
eb9fb5b8 JB |
913 | if ((status->flag & RX_FLAG_DECRYPTED) && |
914 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 915 | return RX_CONTINUE; |
3017b80b | 916 | |
a7767f95 | 917 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
918 | |
919 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 920 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
921 | |
922 | /* | |
923 | * no need to call ieee80211_wep_get_keyidx, | |
924 | * it verifies a bunch of things we've done already | |
925 | */ | |
39184b15 ZY |
926 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
927 | keyidx = keyid >> 6; | |
3017b80b | 928 | |
d4e46a3d | 929 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
930 | |
931 | /* | |
932 | * RSNA-protected unicast frames should always be sent with | |
933 | * pairwise or station-to-station keys, but for WEP we allow | |
934 | * using a key index as well. | |
935 | */ | |
8f20fc24 | 936 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
937 | !is_multicast_ether_addr(hdr->addr1)) |
938 | rx->key = NULL; | |
571ecf67 JB |
939 | } |
940 | ||
3017b80b | 941 | if (rx->key) { |
571ecf67 | 942 | rx->key->tx_rx_count++; |
011bfcc4 | 943 | /* TODO: add threshold stuff again */ |
1990af8d | 944 | } else { |
e4c26add | 945 | return RX_DROP_MONITOR; |
70f08765 JB |
946 | } |
947 | ||
39184b15 ZY |
948 | if (skb_linearize(rx->skb)) |
949 | return RX_DROP_UNUSABLE; | |
950 | ||
951 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
952 | ||
1990af8d JB |
953 | /* Check for weak IVs if possible */ |
954 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 955 | ieee80211_is_data(hdr->frame_control) && |
eb9fb5b8 JB |
956 | (!(status->flag & RX_FLAG_IV_STRIPPED) || |
957 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
958 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
959 | rx->sta->wep_weak_iv_count++; | |
960 | ||
70f08765 JB |
961 | switch (rx->key->conf.alg) { |
962 | case ALG_WEP: | |
e2f036da MN |
963 | result = ieee80211_crypto_wep_decrypt(rx); |
964 | break; | |
70f08765 | 965 | case ALG_TKIP: |
e2f036da MN |
966 | result = ieee80211_crypto_tkip_decrypt(rx); |
967 | break; | |
70f08765 | 968 | case ALG_CCMP: |
e2f036da MN |
969 | result = ieee80211_crypto_ccmp_decrypt(rx); |
970 | break; | |
3cfcf6ac JM |
971 | case ALG_AES_CMAC: |
972 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
973 | break; | |
70f08765 JB |
974 | } |
975 | ||
e2f036da | 976 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 977 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
978 | |
979 | return result; | |
70f08765 JB |
980 | } |
981 | ||
572e0012 KV |
982 | static ieee80211_rx_result debug_noinline |
983 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
984 | { | |
985 | struct ieee80211_local *local; | |
986 | struct ieee80211_hdr *hdr; | |
987 | struct sk_buff *skb; | |
988 | ||
989 | local = rx->local; | |
990 | skb = rx->skb; | |
991 | hdr = (struct ieee80211_hdr *) skb->data; | |
992 | ||
993 | if (!local->pspolling) | |
994 | return RX_CONTINUE; | |
995 | ||
996 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
997 | /* this is not from AP */ | |
998 | return RX_CONTINUE; | |
999 | ||
1000 | if (!ieee80211_is_data(hdr->frame_control)) | |
1001 | return RX_CONTINUE; | |
1002 | ||
1003 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1004 | /* AP has no more frames buffered for us */ | |
1005 | local->pspolling = false; | |
1006 | return RX_CONTINUE; | |
1007 | } | |
1008 | ||
1009 | /* more data bit is set, let's request a new frame from the AP */ | |
1010 | ieee80211_send_pspoll(local, rx->sdata); | |
1011 | ||
1012 | return RX_CONTINUE; | |
1013 | } | |
1014 | ||
133b8226 | 1015 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1016 | { |
133b8226 | 1017 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1018 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1019 | |
3e122be0 | 1020 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1021 | set_sta_flags(sta, WLAN_STA_PS_STA); |
12375ef9 | 1022 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1023 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1024 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1025 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1026 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1027 | } | |
1028 | ||
ff9458d3 | 1029 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1030 | { |
133b8226 | 1031 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1032 | |
3e122be0 | 1033 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1034 | |
af818581 | 1035 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
004c872e | 1036 | |
571ecf67 | 1037 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1038 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1039 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1040 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1041 | |
af818581 | 1042 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1043 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1044 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1045 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1046 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1047 | return; |
1048 | } | |
1049 | ||
1050 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1051 | } |
1052 | ||
49461622 | 1053 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1054 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1055 | { |
1056 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1057 | struct sk_buff *skb = rx->skb; |
1058 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1059 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1060 | |
1061 | if (!sta) | |
9ae54c84 | 1062 | return RX_CONTINUE; |
571ecf67 | 1063 | |
b291ba11 JB |
1064 | /* |
1065 | * Update last_rx only for IBSS packets which are for the current | |
1066 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1067 | * where other STAs start using different BSSID. | |
1068 | */ | |
05c914fe | 1069 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1070 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1071 | NL80211_IFTYPE_ADHOC); |
46900298 | 1072 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1073 | sta->last_rx = jiffies; |
b291ba11 JB |
1074 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1075 | /* | |
33b64eb2 LCC |
1076 | * Mesh beacons will update last_rx when if they are found to |
1077 | * match the current local configuration when processed. | |
571ecf67 | 1078 | */ |
b291ba11 | 1079 | sta->last_rx = jiffies; |
571ecf67 JB |
1080 | } |
1081 | ||
5cf121c3 | 1082 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1083 | return RX_CONTINUE; |
571ecf67 | 1084 | |
3cf335d5 KV |
1085 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1086 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1087 | ||
571ecf67 JB |
1088 | sta->rx_fragments++; |
1089 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1090 | sta->last_signal = status->signal; |
571ecf67 | 1091 | |
72eaa43a JB |
1092 | /* |
1093 | * Change STA power saving mode only at the end of a frame | |
1094 | * exchange sequence. | |
1095 | */ | |
3e122be0 | 1096 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
1097 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1098 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1099 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1100 | /* |
1101 | * Ignore doze->wake transitions that are | |
1102 | * indicated by non-data frames, the standard | |
1103 | * is unclear here, but for example going to | |
1104 | * PS mode and then scanning would cause a | |
1105 | * doze->wake transition for the probe request, | |
1106 | * and that is clearly undesirable. | |
1107 | */ | |
1108 | if (ieee80211_is_data(hdr->frame_control) && | |
1109 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1110 | ap_sta_ps_end(sta); |
72eaa43a JB |
1111 | } else { |
1112 | if (ieee80211_has_pm(hdr->frame_control)) | |
1113 | ap_sta_ps_start(sta); | |
1114 | } | |
571ecf67 JB |
1115 | } |
1116 | ||
22403def JB |
1117 | /* |
1118 | * Drop (qos-)data::nullfunc frames silently, since they | |
1119 | * are used only to control station power saving mode. | |
1120 | */ | |
1121 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1122 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1123 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1124 | |
1125 | /* | |
1126 | * If we receive a 4-addr nullfunc frame from a STA | |
1127 | * that was not moved to a 4-addr STA vlan yet, drop | |
1128 | * the frame to the monitor interface, to make sure | |
1129 | * that hostapd sees it | |
1130 | */ | |
1131 | if (ieee80211_has_a4(hdr->frame_control) && | |
1132 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1133 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1134 | !rx->sdata->u.vlan.sta))) | |
1135 | return RX_DROP_MONITOR; | |
22403def JB |
1136 | /* |
1137 | * Update counter and free packet here to avoid | |
1138 | * counting this as a dropped packed. | |
1139 | */ | |
571ecf67 JB |
1140 | sta->rx_packets++; |
1141 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1142 | return RX_QUEUED; |
571ecf67 JB |
1143 | } |
1144 | ||
9ae54c84 | 1145 | return RX_CONTINUE; |
571ecf67 JB |
1146 | } /* ieee80211_rx_h_sta_process */ |
1147 | ||
571ecf67 JB |
1148 | static inline struct ieee80211_fragment_entry * |
1149 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1150 | unsigned int frag, unsigned int seq, int rx_queue, | |
1151 | struct sk_buff **skb) | |
1152 | { | |
1153 | struct ieee80211_fragment_entry *entry; | |
1154 | int idx; | |
1155 | ||
1156 | idx = sdata->fragment_next; | |
1157 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1158 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1159 | sdata->fragment_next = 0; | |
1160 | ||
1161 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1162 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1163 | struct ieee80211_hdr *hdr = |
1164 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1165 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1166 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1167 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1168 | sdata->name, idx, |
571ecf67 | 1169 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1170 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1171 | #endif |
571ecf67 JB |
1172 | __skb_queue_purge(&entry->skb_list); |
1173 | } | |
1174 | ||
1175 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1176 | *skb = NULL; | |
1177 | entry->first_frag_time = jiffies; | |
1178 | entry->seq = seq; | |
1179 | entry->rx_queue = rx_queue; | |
1180 | entry->last_frag = frag; | |
1181 | entry->ccmp = 0; | |
1182 | entry->extra_len = 0; | |
1183 | ||
1184 | return entry; | |
1185 | } | |
1186 | ||
1187 | static inline struct ieee80211_fragment_entry * | |
1188 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1189 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1190 | int rx_queue, struct ieee80211_hdr *hdr) |
1191 | { | |
1192 | struct ieee80211_fragment_entry *entry; | |
1193 | int i, idx; | |
1194 | ||
1195 | idx = sdata->fragment_next; | |
1196 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1197 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1198 | |
1199 | idx--; | |
1200 | if (idx < 0) | |
1201 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1202 | ||
1203 | entry = &sdata->fragments[idx]; | |
1204 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1205 | entry->rx_queue != rx_queue || | |
1206 | entry->last_frag + 1 != frag) | |
1207 | continue; | |
1208 | ||
b73d70ad | 1209 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1210 | |
b73d70ad HH |
1211 | /* |
1212 | * Check ftype and addresses are equal, else check next fragment | |
1213 | */ | |
1214 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1215 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1216 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1217 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1218 | continue; | |
1219 | ||
ab46623e | 1220 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1221 | __skb_queue_purge(&entry->skb_list); |
1222 | continue; | |
1223 | } | |
1224 | return entry; | |
1225 | } | |
1226 | ||
1227 | return NULL; | |
1228 | } | |
1229 | ||
49461622 | 1230 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1231 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1232 | { |
1233 | struct ieee80211_hdr *hdr; | |
1234 | u16 sc; | |
358c8d9d | 1235 | __le16 fc; |
571ecf67 JB |
1236 | unsigned int frag, seq; |
1237 | struct ieee80211_fragment_entry *entry; | |
1238 | struct sk_buff *skb; | |
1239 | ||
b73d70ad | 1240 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1241 | fc = hdr->frame_control; |
571ecf67 JB |
1242 | sc = le16_to_cpu(hdr->seq_ctrl); |
1243 | frag = sc & IEEE80211_SCTL_FRAG; | |
1244 | ||
358c8d9d | 1245 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1246 | (rx->skb)->len < 24 || |
1247 | is_multicast_ether_addr(hdr->addr1))) { | |
1248 | /* not fragmented */ | |
1249 | goto out; | |
1250 | } | |
1251 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1252 | ||
e3cf8b3f ZY |
1253 | if (skb_linearize(rx->skb)) |
1254 | return RX_DROP_UNUSABLE; | |
1255 | ||
058897a4 AK |
1256 | /* |
1257 | * skb_linearize() might change the skb->data and | |
1258 | * previously cached variables (in this case, hdr) need to | |
1259 | * be refreshed with the new data. | |
1260 | */ | |
1261 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1262 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1263 | ||
1264 | if (frag == 0) { | |
1265 | /* This is the first fragment of a new frame. */ | |
1266 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1267 | rx->queue, &(rx->skb)); |
8f20fc24 | 1268 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1269 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1270 | /* Store CCMP PN so that we can verify that the next |
1271 | * fragment has a sequential PN value. */ | |
1272 | entry->ccmp = 1; | |
1273 | memcpy(entry->last_pn, | |
5cf121c3 | 1274 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1275 | CCMP_PN_LEN); |
1276 | } | |
9ae54c84 | 1277 | return RX_QUEUED; |
571ecf67 JB |
1278 | } |
1279 | ||
1280 | /* This is a fragment for a frame that should already be pending in | |
1281 | * fragment cache. Add this fragment to the end of the pending entry. | |
1282 | */ | |
b73d70ad | 1283 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1284 | if (!entry) { |
1285 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1286 | return RX_DROP_MONITOR; |
571ecf67 JB |
1287 | } |
1288 | ||
1289 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1290 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1291 | if (entry->ccmp) { | |
1292 | int i; | |
1293 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1294 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1295 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1296 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1297 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1298 | pn[i]++; | |
1299 | if (pn[i]) | |
1300 | break; | |
1301 | } | |
5cf121c3 | 1302 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1303 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1304 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1305 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1306 | } | |
1307 | ||
358c8d9d | 1308 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1309 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1310 | entry->last_frag = frag; | |
1311 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1312 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1313 | rx->skb = NULL; |
9ae54c84 | 1314 | return RX_QUEUED; |
571ecf67 JB |
1315 | } |
1316 | ||
1317 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1318 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1319 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1320 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1321 | GFP_ATOMIC))) { | |
1322 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1323 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1324 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1325 | } |
1326 | } | |
1327 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1328 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1329 | dev_kfree_skb(skb); | |
1330 | } | |
1331 | ||
1332 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1333 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1334 | |
1335 | out: | |
1336 | if (rx->sta) | |
1337 | rx->sta->rx_packets++; | |
1338 | if (is_multicast_ether_addr(hdr->addr1)) | |
1339 | rx->local->dot11MulticastReceivedFrameCount++; | |
1340 | else | |
1341 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1342 | return RX_CONTINUE; |
571ecf67 JB |
1343 | } |
1344 | ||
49461622 | 1345 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1346 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1347 | { |
af818581 | 1348 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1349 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1350 | |
358c8d9d | 1351 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1352 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1353 | return RX_CONTINUE; |
571ecf67 | 1354 | |
05c914fe JB |
1355 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1356 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1357 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1358 | |
af818581 JB |
1359 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1360 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1361 | else | |
1362 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1363 | |
9ae54c84 | 1364 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1365 | * count as an dropped frame. */ |
1366 | dev_kfree_skb(rx->skb); | |
1367 | ||
9ae54c84 | 1368 | return RX_QUEUED; |
571ecf67 JB |
1369 | } |
1370 | ||
49461622 | 1371 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1372 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1373 | { |
6e0d114d | 1374 | u8 *data = rx->skb->data; |
238f74a2 | 1375 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1376 | |
238f74a2 | 1377 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1378 | return RX_CONTINUE; |
6e0d114d JB |
1379 | |
1380 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1381 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1382 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1383 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1384 | /* change frame type to non QOS */ |
238f74a2 | 1385 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1386 | |
9ae54c84 | 1387 | return RX_CONTINUE; |
6e0d114d JB |
1388 | } |
1389 | ||
76ee65bf | 1390 | static int |
5cf121c3 | 1391 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1392 | { |
07346f81 | 1393 | if (unlikely(!rx->sta || |
f4ea83dd | 1394 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1395 | return -EACCES; |
571ecf67 | 1396 | |
76ee65bf | 1397 | return 0; |
571ecf67 JB |
1398 | } |
1399 | ||
76ee65bf | 1400 | static int |
358c8d9d | 1401 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1402 | { |
eb9fb5b8 JB |
1403 | struct sk_buff *skb = rx->skb; |
1404 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1405 | ||
3017b80b | 1406 | /* |
7848ba7d JB |
1407 | * Pass through unencrypted frames if the hardware has |
1408 | * decrypted them already. | |
3017b80b | 1409 | */ |
eb9fb5b8 | 1410 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1411 | return 0; |
571ecf67 JB |
1412 | |
1413 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1414 | if (unlikely(!ieee80211_has_protected(fc) && |
1415 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1416 | ieee80211_is_data(fc) && |
b3fc9c6c | 1417 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1418 | return -EACCES; |
bef5d1c7 JB |
1419 | |
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | static int | |
1424 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1425 | { | |
1426 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1427 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1428 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1429 | |
e3efca0a JM |
1430 | /* |
1431 | * Pass through unencrypted frames if the hardware has | |
1432 | * decrypted them already. | |
1433 | */ | |
1434 | if (status->flag & RX_FLAG_DECRYPTED) | |
1435 | return 0; | |
bef5d1c7 | 1436 | |
f2ca3ea4 | 1437 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1438 | if (unlikely(!ieee80211_has_protected(fc) && |
1439 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
f2ca3ea4 JM |
1440 | rx->key)) |
1441 | return -EACCES; | |
1442 | /* BIP does not use Protected field, so need to check MMIE */ | |
f64f9e71 | 1443 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
fa83a218 | 1444 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) |
f2ca3ea4 JM |
1445 | return -EACCES; |
1446 | /* | |
1447 | * When using MFP, Action frames are not allowed prior to | |
1448 | * having configured keys. | |
1449 | */ | |
1450 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1451 | ieee80211_is_robust_mgmt_frame( | |
1452 | (struct ieee80211_hdr *) rx->skb->data))) | |
1453 | return -EACCES; | |
1454 | } | |
b3fc9c6c | 1455 | |
76ee65bf | 1456 | return 0; |
571ecf67 JB |
1457 | } |
1458 | ||
76ee65bf | 1459 | static int |
e31a16d6 | 1460 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1461 | { |
eb9fb5b8 | 1462 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee FF |
1463 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1464 | ||
9bc383de JB |
1465 | if (ieee80211_has_a4(hdr->frame_control) && |
1466 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1467 | return -1; |
9bc383de JB |
1468 | |
1469 | if (is_multicast_ether_addr(hdr->addr1) && | |
1470 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1471 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1472 | return -1; |
571ecf67 | 1473 | |
47846c9b | 1474 | return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
76ee65bf | 1475 | } |
571ecf67 | 1476 | |
ce3edf6d JB |
1477 | /* |
1478 | * requires that rx->skb is a frame with ethernet header | |
1479 | */ | |
358c8d9d | 1480 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1481 | { |
c97c23e3 | 1482 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1483 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1484 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1485 | ||
1486 | /* | |
1487 | * Allow EAPOL frames to us/the PAE group address regardless | |
1488 | * of whether the frame was encrypted or not. | |
1489 | */ | |
1490 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
47846c9b | 1491 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1492 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1493 | return true; | |
1494 | ||
1495 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1496 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1497 | return false; |
1498 | ||
1499 | return true; | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * requires that rx->skb is a frame with ethernet header | |
1504 | */ | |
76ee65bf | 1505 | static void |
5cf121c3 | 1506 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1507 | { |
eb9fb5b8 JB |
1508 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1509 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1510 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1511 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1512 | struct sta_info *dsta; | |
571ecf67 | 1513 | |
76ee65bf RR |
1514 | skb = rx->skb; |
1515 | xmit_skb = NULL; | |
571ecf67 | 1516 | |
05c914fe JB |
1517 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1518 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1519 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
9bc383de JB |
1520 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
1521 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
ce3edf6d JB |
1522 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1523 | /* | |
1524 | * send multicast frames both to higher layers in | |
1525 | * local net stack and back to the wireless medium | |
1526 | */ | |
76ee65bf RR |
1527 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1528 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1529 | printk(KERN_DEBUG "%s: failed to clone " |
1530 | "multicast frame\n", dev->name); | |
1531 | } else { | |
abe60632 JB |
1532 | dsta = sta_info_get(sdata, skb->data); |
1533 | if (dsta) { | |
ce3edf6d JB |
1534 | /* |
1535 | * The destination station is associated to | |
1536 | * this AP (in this VLAN), so send the frame | |
1537 | * directly to it and do not pass it to local | |
1538 | * net stack. | |
571ecf67 | 1539 | */ |
76ee65bf | 1540 | xmit_skb = skb; |
571ecf67 JB |
1541 | skb = NULL; |
1542 | } | |
571ecf67 JB |
1543 | } |
1544 | } | |
1545 | ||
1546 | if (skb) { | |
d1c3a37c JB |
1547 | int align __maybe_unused; |
1548 | ||
59d9cb07 | 1549 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1550 | /* |
1551 | * 'align' will only take the values 0 or 2 here | |
1552 | * since all frames are required to be aligned | |
1553 | * to 2-byte boundaries when being passed to | |
1554 | * mac80211. That also explains the __skb_push() | |
1555 | * below. | |
1556 | */ | |
dacb6f1d | 1557 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1558 | if (align) { |
1559 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1560 | dev_kfree_skb(skb); | |
1561 | skb = NULL; | |
1562 | } else { | |
1563 | u8 *data = skb->data; | |
8ce0b589 ZY |
1564 | size_t len = skb_headlen(skb); |
1565 | skb->data -= align; | |
1566 | memmove(skb->data, data, len); | |
1567 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1568 | } |
1569 | } | |
1570 | #endif | |
1571 | ||
1572 | if (skb) { | |
1573 | /* deliver to local stack */ | |
1574 | skb->protocol = eth_type_trans(skb, dev); | |
1575 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1576 | netif_rx(skb); | |
1577 | } | |
571ecf67 JB |
1578 | } |
1579 | ||
76ee65bf | 1580 | if (xmit_skb) { |
571ecf67 | 1581 | /* send to wireless media */ |
f831e909 | 1582 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1583 | skb_reset_network_header(xmit_skb); |
1584 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1585 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1586 | } |
76ee65bf RR |
1587 | } |
1588 | ||
49461622 | 1589 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1590 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1591 | { |
eb9fb5b8 | 1592 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1593 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1594 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1595 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1596 | struct sk_buff_head frame_list; |
fd4c7f2f | 1597 | |
358c8d9d | 1598 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1599 | return RX_CONTINUE; |
fd4c7f2f | 1600 | |
358c8d9d | 1601 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1602 | return RX_DROP_MONITOR; |
fd4c7f2f | 1603 | |
5cf121c3 | 1604 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1605 | return RX_CONTINUE; |
fd4c7f2f | 1606 | |
eaf85ca7 ZY |
1607 | if (ieee80211_has_a4(hdr->frame_control) && |
1608 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1609 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1610 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1611 | |
eaf85ca7 ZY |
1612 | if (is_multicast_ether_addr(hdr->addr1) && |
1613 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1614 | rx->sdata->u.vlan.sta) || | |
1615 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1616 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1617 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1618 | |
eaf85ca7 ZY |
1619 | skb->dev = dev; |
1620 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1621 | |
e3cf8b3f ZY |
1622 | if (skb_linearize(skb)) |
1623 | return RX_DROP_UNUSABLE; | |
1624 | ||
eaf85ca7 ZY |
1625 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1626 | rx->sdata->vif.type, | |
1627 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1628 | |
eaf85ca7 ZY |
1629 | while (!skb_queue_empty(&frame_list)) { |
1630 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1631 | |
358c8d9d | 1632 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1633 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1634 | continue; |
1635 | } | |
eaf85ca7 ZY |
1636 | dev->stats.rx_packets++; |
1637 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1638 | |
1639 | ieee80211_deliver_skb(rx); | |
1640 | } | |
1641 | ||
9ae54c84 | 1642 | return RX_QUEUED; |
fd4c7f2f RR |
1643 | } |
1644 | ||
bf94e17b | 1645 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1646 | static ieee80211_rx_result |
e32f85f7 LCC |
1647 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1648 | { | |
1649 | struct ieee80211_hdr *hdr; | |
1650 | struct ieee80211s_hdr *mesh_hdr; | |
1651 | unsigned int hdrlen; | |
1652 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1653 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1654 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e32f85f7 LCC |
1655 | |
1656 | hdr = (struct ieee80211_hdr *) skb->data; | |
1657 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1658 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1659 | ||
1660 | if (!ieee80211_is_data(hdr->frame_control)) | |
1661 | return RX_CONTINUE; | |
1662 | ||
1663 | if (!mesh_hdr->ttl) | |
1664 | /* illegal frame */ | |
1665 | return RX_DROP_MONITOR; | |
1666 | ||
43b7b314 | 1667 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1668 | struct mesh_path *mppath; |
43b7b314 JC |
1669 | char *proxied_addr; |
1670 | char *mpp_addr; | |
1671 | ||
1672 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1673 | mpp_addr = hdr->addr3; | |
1674 | proxied_addr = mesh_hdr->eaddr1; | |
1675 | } else { | |
1676 | mpp_addr = hdr->addr4; | |
1677 | proxied_addr = mesh_hdr->eaddr2; | |
1678 | } | |
79617dee | 1679 | |
79617dee | 1680 | rcu_read_lock(); |
43b7b314 | 1681 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1682 | if (!mppath) { |
43b7b314 | 1683 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1684 | } else { |
1685 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1686 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1687 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1688 | spin_unlock_bh(&mppath->state_lock); |
1689 | } | |
1690 | rcu_read_unlock(); | |
1691 | } | |
1692 | ||
3c5772a5 JC |
1693 | /* Frame has reached destination. Don't forward */ |
1694 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1695 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1696 | return RX_CONTINUE; |
1697 | ||
1698 | mesh_hdr->ttl--; | |
1699 | ||
1700 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1701 | if (!mesh_hdr->ttl) | |
472dbc45 | 1702 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1703 | dropped_frames_ttl); |
1704 | else { | |
1705 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1706 | struct ieee80211_tx_info *info; |
1707 | ||
e32f85f7 LCC |
1708 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1709 | ||
1710 | if (!fwd_skb && net_ratelimit()) | |
1711 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1712 | sdata->name); |
e32f85f7 LCC |
1713 | |
1714 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1715 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1716 | info = IEEE80211_SKB_CB(fwd_skb); |
1717 | memset(info, 0, sizeof(*info)); | |
1718 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1719 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1720 | skb_set_queue_mapping(skb, |
1721 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1722 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1723 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1724 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1725 | fwded_mcast); | |
1726 | else { | |
3c5772a5 JC |
1727 | int err; |
1728 | /* | |
1729 | * Save TA to addr1 to send TA a path error if a | |
1730 | * suitable next hop is not found | |
1731 | */ | |
1732 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1733 | ETH_ALEN); |
3c5772a5 | 1734 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1735 | /* Failed to immediately resolve next hop: |
1736 | * fwded frame was dropped or will be added | |
1737 | * later to the pending skb queue. */ | |
1738 | if (err) | |
1739 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1740 | |
1741 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1742 | fwded_unicast); | |
249b405c JC |
1743 | } |
1744 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1745 | fwded_frames); | |
3b8d81e0 | 1746 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1747 | } |
1748 | } | |
1749 | ||
3c5772a5 | 1750 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1751 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1752 | return RX_CONTINUE; |
1753 | else | |
1754 | return RX_DROP_MONITOR; | |
1755 | } | |
bf94e17b | 1756 | #endif |
e32f85f7 | 1757 | |
49461622 | 1758 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1759 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1760 | { |
eb9fb5b8 | 1761 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1762 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1763 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1764 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1765 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1766 | int err; |
76ee65bf | 1767 | |
358c8d9d | 1768 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1769 | return RX_CONTINUE; |
76ee65bf | 1770 | |
358c8d9d | 1771 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1772 | return RX_DROP_MONITOR; |
76ee65bf | 1773 | |
f14543ee FF |
1774 | /* |
1775 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1776 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1777 | */ | |
1778 | if (ieee80211_has_a4(hdr->frame_control) && | |
1779 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1780 | return RX_DROP_MONITOR; | |
1781 | ||
e31a16d6 | 1782 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1783 | if (unlikely(err)) |
e4c26add | 1784 | return RX_DROP_UNUSABLE; |
76ee65bf | 1785 | |
358c8d9d | 1786 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1787 | return RX_DROP_MONITOR; |
ce3edf6d | 1788 | |
76ee65bf RR |
1789 | rx->skb->dev = dev; |
1790 | ||
1791 | dev->stats.rx_packets++; | |
1792 | dev->stats.rx_bytes += rx->skb->len; | |
1793 | ||
e15276a4 VN |
1794 | if (ieee80211_is_data(hdr->frame_control) && |
1795 | !is_multicast_ether_addr(hdr->addr1) && | |
1796 | local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) { | |
1797 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
1798 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1799 | } | |
1800 | ||
76ee65bf | 1801 | ieee80211_deliver_skb(rx); |
571ecf67 | 1802 | |
9ae54c84 | 1803 | return RX_QUEUED; |
571ecf67 JB |
1804 | } |
1805 | ||
49461622 | 1806 | static ieee80211_rx_result debug_noinline |
2569a826 | 1807 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
71364716 RR |
1808 | { |
1809 | struct ieee80211_local *local = rx->local; | |
1810 | struct ieee80211_hw *hw = &local->hw; | |
1811 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1812 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1813 | struct tid_ampdu_rx *tid_agg_rx; |
1814 | u16 start_seq_num; | |
1815 | u16 tid; | |
1816 | ||
a7767f95 | 1817 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1818 | return RX_CONTINUE; |
71364716 | 1819 | |
a7767f95 | 1820 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1821 | if (!rx->sta) |
a02ae758 | 1822 | return RX_DROP_MONITOR; |
54297e4d | 1823 | spin_lock(&rx->sta->lock); |
71364716 | 1824 | tid = le16_to_cpu(bar->control) >> 12; |
54297e4d JB |
1825 | if (!rx->sta->ampdu_mlme.tid_active_rx[tid]) { |
1826 | spin_unlock(&rx->sta->lock); | |
a02ae758 | 1827 | return RX_DROP_MONITOR; |
54297e4d | 1828 | } |
cee24a3e | 1829 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1830 | |
1831 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1832 | ||
1833 | /* reset session timer */ | |
20ad19d0 JB |
1834 | if (tid_agg_rx->timeout) |
1835 | mod_timer(&tid_agg_rx->session_timer, | |
1836 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1837 | |
a02ae758 | 1838 | /* release stored frames up to start of BAR */ |
2569a826 JB |
1839 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
1840 | frames); | |
a02ae758 | 1841 | kfree_skb(skb); |
54297e4d | 1842 | spin_unlock(&rx->sta->lock); |
a02ae758 | 1843 | return RX_QUEUED; |
71364716 RR |
1844 | } |
1845 | ||
9ae54c84 | 1846 | return RX_CONTINUE; |
71364716 RR |
1847 | } |
1848 | ||
f4f727a6 JM |
1849 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1850 | struct ieee80211_mgmt *mgmt, | |
1851 | size_t len) | |
fea14732 JM |
1852 | { |
1853 | struct ieee80211_local *local = sdata->local; | |
1854 | struct sk_buff *skb; | |
1855 | struct ieee80211_mgmt *resp; | |
1856 | ||
47846c9b | 1857 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
1858 | /* Not to own unicast address */ |
1859 | return; | |
1860 | } | |
1861 | ||
46900298 JB |
1862 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1863 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1864 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1865 | return; |
1866 | } | |
1867 | ||
1868 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1869 | /* Too short SA Query request frame */ | |
1870 | return; | |
1871 | } | |
1872 | ||
1873 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1874 | if (skb == NULL) | |
1875 | return; | |
1876 | ||
1877 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1878 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1879 | memset(resp, 0, 24); | |
1880 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 1881 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 1882 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1883 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1884 | IEEE80211_STYPE_ACTION); | |
1885 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1886 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1887 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1888 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1889 | mgmt->u.action.u.sa_query.trans_id, | |
1890 | WLAN_SA_QUERY_TR_ID_LEN); | |
1891 | ||
62ae67be | 1892 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
1893 | } |
1894 | ||
de1ede7a JB |
1895 | static ieee80211_rx_result debug_noinline |
1896 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1897 | { | |
1898 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 1899 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 1900 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
84040805 | 1901 | struct sk_buff *nskb; |
026331c4 | 1902 | struct ieee80211_rx_status *status; |
de1ede7a JB |
1903 | int len = rx->skb->len; |
1904 | ||
1905 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1906 | return RX_CONTINUE; | |
1907 | ||
026331c4 JM |
1908 | /* drop too small frames */ |
1909 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 1910 | return RX_DROP_UNUSABLE; |
de1ede7a | 1911 | |
026331c4 | 1912 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 1913 | return RX_DROP_UNUSABLE; |
de1ede7a | 1914 | |
026331c4 | 1915 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 1916 | return RX_DROP_UNUSABLE; |
97ebe12a | 1917 | |
bef5d1c7 | 1918 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
84040805 JB |
1919 | return RX_DROP_UNUSABLE; |
1920 | ||
de1ede7a JB |
1921 | switch (mgmt->u.action.category) { |
1922 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1923 | /* |
1924 | * The aggregation code is not prepared to handle | |
1925 | * anything but STA/AP due to the BSSID handling; | |
1926 | * IBSS could work in the code but isn't supported | |
1927 | * by drivers or the standard. | |
1928 | */ | |
1929 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1930 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1931 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 1932 | break; |
8abd3f9b | 1933 | |
026331c4 JM |
1934 | /* verify action_code is present */ |
1935 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1936 | break; | |
1937 | ||
de1ede7a JB |
1938 | switch (mgmt->u.action.u.addba_req.action_code) { |
1939 | case WLAN_ACTION_ADDBA_REQ: | |
1940 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1941 | sizeof(mgmt->u.action.u.addba_req))) | |
1942 | return RX_DROP_MONITOR; | |
1943 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
84040805 | 1944 | goto handled; |
de1ede7a JB |
1945 | case WLAN_ACTION_ADDBA_RESP: |
1946 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1947 | sizeof(mgmt->u.action.u.addba_resp))) | |
84040805 | 1948 | break; |
de1ede7a | 1949 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); |
84040805 | 1950 | goto handled; |
de1ede7a JB |
1951 | case WLAN_ACTION_DELBA: |
1952 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1953 | sizeof(mgmt->u.action.u.delba))) | |
84040805 | 1954 | break; |
de1ede7a | 1955 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); |
84040805 | 1956 | goto handled; |
de1ede7a | 1957 | } |
39192c0b JB |
1958 | break; |
1959 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1960 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 1961 | break; |
46900298 JB |
1962 | |
1963 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 1964 | break; |
46900298 | 1965 | |
026331c4 JM |
1966 | /* verify action_code is present */ |
1967 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1968 | break; | |
1969 | ||
39192c0b JB |
1970 | switch (mgmt->u.action.u.measurement.action_code) { |
1971 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1972 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1973 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 1974 | break; |
39192c0b | 1975 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 1976 | goto handled; |
c481ec97 S |
1977 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1978 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1979 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 1980 | break; |
c481ec97 | 1981 | |
cc32abd4 | 1982 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 1983 | break; |
cc32abd4 | 1984 | |
46900298 | 1985 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 1986 | break; |
c481ec97 | 1987 | |
77fdaa12 | 1988 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1989 | } |
1990 | break; | |
fea14732 JM |
1991 | case WLAN_CATEGORY_SA_QUERY: |
1992 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1993 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
1994 | break; |
1995 | ||
fea14732 JM |
1996 | switch (mgmt->u.action.u.sa_query.action) { |
1997 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1998 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 1999 | break; |
fea14732 | 2000 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2001 | goto handled; |
fea14732 JM |
2002 | } |
2003 | break; | |
97ad9139 JC |
2004 | case WLAN_CATEGORY_MESH_PLINK: |
2005 | case WLAN_CATEGORY_MESH_PATH_SEL: | |
1cb561f8 JC |
2006 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2007 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); | |
2008 | break; | |
84040805 | 2009 | } |
026331c4 | 2010 | |
84040805 JB |
2011 | /* |
2012 | * For AP mode, hostapd is responsible for handling any action | |
2013 | * frames that we didn't handle, including returning unknown | |
2014 | * ones. For all other modes we will return them to the sender, | |
2015 | * setting the 0x80 bit in the action category, as required by | |
2016 | * 802.11-2007 7.3.1.11. | |
2017 | */ | |
2018 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
2019 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2020 | return RX_DROP_MONITOR; | |
d7907448 | 2021 | |
026331c4 JM |
2022 | /* |
2023 | * Getting here means the kernel doesn't know how to handle | |
2024 | * it, but maybe userspace does ... include returned frames | |
2025 | * so userspace can register for those to know whether ones | |
2026 | * it transmitted were processed or returned. | |
2027 | */ | |
2028 | status = IEEE80211_SKB_RXCB(rx->skb); | |
2029 | ||
2030 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
2031 | cfg80211_rx_action(rx->sdata->dev, status->freq, | |
2032 | rx->skb->data, rx->skb->len, | |
2033 | GFP_ATOMIC)) | |
2034 | goto handled; | |
2035 | ||
84040805 JB |
2036 | /* do not return rejected action frames */ |
2037 | if (mgmt->u.action.category & 0x80) | |
2038 | return RX_DROP_UNUSABLE; | |
2039 | ||
2040 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2041 | GFP_ATOMIC); | |
2042 | if (nskb) { | |
2043 | struct ieee80211_mgmt *mgmt = (void *)nskb->data; | |
2044 | ||
2045 | mgmt->u.action.category |= 0x80; | |
2046 | memcpy(mgmt->da, mgmt->sa, ETH_ALEN); | |
2047 | memcpy(mgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
2048 | ||
2049 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2050 | ||
2051 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a JB |
2052 | } |
2053 | ||
84040805 | 2054 | handled: |
026331c4 JM |
2055 | if (rx->sta) |
2056 | rx->sta->rx_packets++; | |
39192c0b JB |
2057 | dev_kfree_skb(rx->skb); |
2058 | return RX_QUEUED; | |
de1ede7a JB |
2059 | } |
2060 | ||
49461622 | 2061 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2062 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2063 | { |
eb9fb5b8 | 2064 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2065 | ieee80211_rx_result rxs; |
571ecf67 | 2066 | |
5cf121c3 | 2067 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 2068 | return RX_DROP_MONITOR; |
571ecf67 | 2069 | |
bef5d1c7 JB |
2070 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
2071 | return RX_DROP_UNUSABLE; | |
97ebe12a | 2072 | |
af6b6374 JB |
2073 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2074 | if (rxs != RX_CONTINUE) | |
2075 | return rxs; | |
2076 | ||
472dbc45 | 2077 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 2078 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 2079 | |
3832c287 | 2080 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 2081 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 2082 | |
7986cf95 | 2083 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 2084 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 2085 | |
7986cf95 | 2086 | return RX_DROP_MONITOR; |
571ecf67 JB |
2087 | } |
2088 | ||
3b8d81e0 | 2089 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2090 | struct ieee80211_rx_data *rx) |
571ecf67 | 2091 | { |
a7767f95 HH |
2092 | int keyidx; |
2093 | unsigned int hdrlen; | |
571ecf67 | 2094 | |
a7767f95 | 2095 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2096 | if (rx->skb->len >= hdrlen + 4) |
2097 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2098 | else | |
2099 | keyidx = -1; | |
2100 | ||
8944b79f | 2101 | if (!rx->sta) { |
aa0daf0e JB |
2102 | /* |
2103 | * Some hardware seem to generate incorrect Michael MIC | |
2104 | * reports; ignore them to avoid triggering countermeasures. | |
2105 | */ | |
af2ced6a | 2106 | return; |
571ecf67 JB |
2107 | } |
2108 | ||
a7767f95 | 2109 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2110 | return; |
571ecf67 | 2111 | |
05c914fe | 2112 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2113 | /* |
2114 | * APs with pairwise keys should never receive Michael MIC | |
2115 | * errors for non-zero keyidx because these are reserved for | |
2116 | * group keys and only the AP is sending real multicast | |
2117 | * frames in the BSS. | |
2118 | */ | |
af2ced6a | 2119 | return; |
571ecf67 JB |
2120 | } |
2121 | ||
a7767f95 HH |
2122 | if (!ieee80211_is_data(hdr->frame_control) && |
2123 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2124 | return; |
571ecf67 | 2125 | |
e6d6e342 JB |
2126 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2127 | GFP_ATOMIC); | |
571ecf67 JB |
2128 | } |
2129 | ||
5cf121c3 | 2130 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2131 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2132 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2133 | { |
2134 | struct ieee80211_sub_if_data *sdata; | |
2135 | struct ieee80211_local *local = rx->local; | |
2136 | struct ieee80211_rtap_hdr { | |
2137 | struct ieee80211_radiotap_header hdr; | |
2138 | u8 flags; | |
5f0b7de5 | 2139 | u8 rate_or_pad; |
3d30d949 MW |
2140 | __le16 chan_freq; |
2141 | __le16 chan_flags; | |
2142 | } __attribute__ ((packed)) *rthdr; | |
2143 | struct sk_buff *skb = rx->skb, *skb2; | |
2144 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2145 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2146 | |
8c0c709e | 2147 | if (status->flag & RX_FLAG_INTERNAL_CMTR) |
3d30d949 MW |
2148 | goto out_free_skb; |
2149 | ||
2150 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
2151 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2152 | goto out_free_skb; | |
2153 | ||
2154 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2155 | memset(rthdr, 0, sizeof(*rthdr)); | |
2156 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2157 | rthdr->hdr.it_present = | |
2158 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2159 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2160 | ||
5f0b7de5 JB |
2161 | if (rate) { |
2162 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2163 | rthdr->hdr.it_present |= | |
2164 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2165 | } | |
3d30d949 MW |
2166 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2167 | ||
2168 | if (status->band == IEEE80211_BAND_5GHZ) | |
2169 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2170 | IEEE80211_CHAN_5GHZ); | |
2171 | else | |
2172 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2173 | IEEE80211_CHAN_2GHZ); | |
2174 | ||
2175 | skb_set_mac_header(skb, 0); | |
2176 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2177 | skb->pkt_type = PACKET_OTHERHOST; | |
2178 | skb->protocol = htons(ETH_P_802_2); | |
2179 | ||
2180 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2181 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2182 | continue; |
2183 | ||
05c914fe | 2184 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2185 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2186 | continue; | |
2187 | ||
2188 | if (prev_dev) { | |
2189 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2190 | if (skb2) { | |
2191 | skb2->dev = prev_dev; | |
2192 | netif_rx(skb2); | |
2193 | } | |
2194 | } | |
2195 | ||
2196 | prev_dev = sdata->dev; | |
2197 | sdata->dev->stats.rx_packets++; | |
2198 | sdata->dev->stats.rx_bytes += skb->len; | |
2199 | } | |
2200 | ||
2201 | if (prev_dev) { | |
2202 | skb->dev = prev_dev; | |
2203 | netif_rx(skb); | |
2204 | skb = NULL; | |
2205 | } else | |
2206 | goto out_free_skb; | |
2207 | ||
8c0c709e | 2208 | status->flag |= RX_FLAG_INTERNAL_CMTR; |
3d30d949 MW |
2209 | return; |
2210 | ||
2211 | out_free_skb: | |
2212 | dev_kfree_skb(skb); | |
2213 | } | |
2214 | ||
571ecf67 | 2215 | |
8944b79f | 2216 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2217 | struct ieee80211_rx_data *rx, |
5f0b7de5 JB |
2218 | struct sk_buff *skb, |
2219 | struct ieee80211_rate *rate) | |
58905290 | 2220 | { |
2569a826 | 2221 | struct sk_buff_head reorder_release; |
58905290 JB |
2222 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2223 | ||
2569a826 JB |
2224 | __skb_queue_head_init(&reorder_release); |
2225 | ||
8944b79f JB |
2226 | rx->skb = skb; |
2227 | rx->sdata = sdata; | |
8944b79f | 2228 | |
e32f85f7 LCC |
2229 | #define CALL_RXH(rxh) \ |
2230 | do { \ | |
2231 | res = rxh(rx); \ | |
2232 | if (res != RX_CONTINUE) \ | |
2569a826 | 2233 | goto rxh_next; \ |
e32f85f7 | 2234 | } while (0); |
49461622 | 2235 | |
2569a826 JB |
2236 | /* |
2237 | * NB: the rxh_next label works even if we jump | |
2238 | * to it from here because then the list will | |
2239 | * be empty, which is a trivial check | |
2240 | */ | |
49461622 JB |
2241 | CALL_RXH(ieee80211_rx_h_passive_scan) |
2242 | CALL_RXH(ieee80211_rx_h_check) | |
2569a826 JB |
2243 | |
2244 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); | |
2245 | ||
2246 | while ((skb = __skb_dequeue(&reorder_release))) { | |
2247 | /* | |
2248 | * all the other fields are valid across frames | |
2249 | * that belong to an aMPDU since they are on the | |
2250 | * same TID from the same station | |
2251 | */ | |
2252 | rx->skb = skb; | |
2253 | ||
2254 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2255 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2256 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2257 | CALL_RXH(ieee80211_rx_h_defragment) | |
2258 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2259 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2260 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2261 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2262 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2263 | #ifdef CONFIG_MAC80211_MESH |
2569a826 JB |
2264 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2265 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2266 | #endif |
2569a826 JB |
2267 | CALL_RXH(ieee80211_rx_h_data) |
2268 | ||
2269 | /* special treatment -- needs the queue */ | |
2270 | res = ieee80211_rx_h_ctrl(rx, &reorder_release); | |
2271 | if (res != RX_CONTINUE) | |
2272 | goto rxh_next; | |
2273 | ||
2274 | CALL_RXH(ieee80211_rx_h_action) | |
2275 | CALL_RXH(ieee80211_rx_h_mgmt) | |
49461622 JB |
2276 | |
2277 | #undef CALL_RXH | |
2278 | ||
2569a826 JB |
2279 | rxh_next: |
2280 | switch (res) { | |
2281 | case RX_DROP_MONITOR: | |
2282 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2283 | if (rx->sta) | |
2284 | rx->sta->rx_dropped++; | |
2285 | /* fall through */ | |
2286 | case RX_CONTINUE: | |
2287 | ieee80211_rx_cooked_monitor(rx, rate); | |
2288 | break; | |
2289 | case RX_DROP_UNUSABLE: | |
2290 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2291 | if (rx->sta) | |
2292 | rx->sta->rx_dropped++; | |
2293 | dev_kfree_skb(rx->skb); | |
2294 | break; | |
2295 | case RX_QUEUED: | |
2296 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2297 | break; | |
2298 | } | |
58905290 JB |
2299 | } |
2300 | } | |
2301 | ||
571ecf67 JB |
2302 | /* main receive path */ |
2303 | ||
23a24def | 2304 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2305 | struct ieee80211_rx_data *rx, |
23a24def JB |
2306 | struct ieee80211_hdr *hdr) |
2307 | { | |
eb9fb5b8 JB |
2308 | struct sk_buff *skb = rx->skb; |
2309 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2310 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2311 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2312 | ||
51fb61e7 | 2313 | switch (sdata->vif.type) { |
05c914fe | 2314 | case NL80211_IFTYPE_STATION: |
9bc383de | 2315 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2316 | return 0; |
77fdaa12 | 2317 | if (!multicast && |
47846c9b | 2318 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2319 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2320 | return 0; |
5cf121c3 | 2321 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2322 | } |
2323 | break; | |
05c914fe | 2324 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2325 | if (!bssid) |
2326 | return 0; | |
a7767f95 | 2327 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2328 | return 1; |
87291c02 | 2329 | } |
46900298 | 2330 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2331 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2332 | return 0; |
5cf121c3 | 2333 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2334 | } else if (!multicast && |
47846c9b | 2335 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2336 | hdr->addr1) != 0) { |
4150c572 | 2337 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2338 | return 0; |
5cf121c3 | 2339 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2340 | } else if (!rx->sta) { |
2341 | int rate_idx; | |
eb9fb5b8 | 2342 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2343 | rate_idx = 0; /* TODO: HT rates */ |
2344 | else | |
eb9fb5b8 | 2345 | rate_idx = status->rate_idx; |
34e89507 JB |
2346 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2347 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2348 | } |
23a24def | 2349 | break; |
05c914fe | 2350 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2351 | if (!multicast && |
47846c9b | 2352 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2353 | hdr->addr1) != 0) { |
2354 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2355 | return 0; | |
2356 | ||
5cf121c3 | 2357 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2358 | } |
2359 | break; | |
05c914fe JB |
2360 | case NL80211_IFTYPE_AP_VLAN: |
2361 | case NL80211_IFTYPE_AP: | |
23a24def | 2362 | if (!bssid) { |
47846c9b | 2363 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2364 | hdr->addr1)) |
2365 | return 0; | |
2366 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2367 | sdata->vif.addr)) { |
5cf121c3 | 2368 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2369 | return 0; |
5cf121c3 | 2370 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2371 | } |
23a24def | 2372 | break; |
05c914fe | 2373 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2374 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2375 | return 0; |
2376 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2377 | return 0; | |
2378 | break; | |
05c914fe | 2379 | case NL80211_IFTYPE_MONITOR: |
05c914fe JB |
2380 | case NL80211_IFTYPE_UNSPECIFIED: |
2381 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2382 | /* should never get here */ |
2383 | WARN_ON(1); | |
2384 | break; | |
23a24def JB |
2385 | } |
2386 | ||
2387 | return 1; | |
2388 | } | |
2389 | ||
571ecf67 | 2390 | /* |
6368e4b1 RR |
2391 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2392 | * be called with rcu_read_lock protection. | |
571ecf67 | 2393 | */ |
71ebb4aa RR |
2394 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2395 | struct sk_buff *skb, | |
8318d78a | 2396 | struct ieee80211_rate *rate) |
571ecf67 | 2397 | { |
f1d58c25 | 2398 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2399 | struct ieee80211_local *local = hw_to_local(hw); |
2400 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2401 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2402 | __le16 fc; |
5cf121c3 | 2403 | struct ieee80211_rx_data rx; |
6368e4b1 | 2404 | int prepares; |
8e6f0032 JB |
2405 | struct ieee80211_sub_if_data *prev = NULL; |
2406 | struct sk_buff *skb_new; | |
abe60632 JB |
2407 | struct sta_info *sta, *tmp; |
2408 | bool found_sta = false; | |
e3cf8b3f | 2409 | int err = 0; |
571ecf67 | 2410 | |
e3cf8b3f | 2411 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2412 | memset(&rx, 0, sizeof(rx)); |
2413 | rx.skb = skb; | |
2414 | rx.local = local; | |
72abd81b | 2415 | |
e3cf8b3f | 2416 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2417 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2418 | |
142b9f50 HS |
2419 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2420 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2421 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2422 | |
e3cf8b3f ZY |
2423 | if (ieee80211_is_mgmt(fc)) |
2424 | err = skb_linearize(skb); | |
2425 | else | |
2426 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2427 | ||
2428 | if (err) { | |
2429 | dev_kfree_skb(skb); | |
2430 | return; | |
2431 | } | |
2432 | ||
2433 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2434 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2435 | ieee80211_verify_alignment(&rx); |
38f3714d | 2436 | |
e3cf8b3f | 2437 | if (ieee80211_is_data(fc)) { |
abe60632 JB |
2438 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
2439 | rx.sta = sta; | |
2440 | found_sta = true; | |
2441 | rx.sdata = sta->sdata; | |
2442 | ||
2443 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2444 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
2445 | if (prepares) { | |
2446 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2447 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2448 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2449 | } else | |
2450 | prev = rx.sdata; | |
2451 | } | |
af2ced6a | 2452 | } |
abe60632 JB |
2453 | } |
2454 | if (!found_sta) { | |
2455 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2456 | if (!ieee80211_sdata_running(sdata)) |
abe60632 | 2457 | continue; |
2a8a9a88 | 2458 | |
abe60632 JB |
2459 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2460 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2461 | continue; | |
b2e7771e | 2462 | |
abe60632 JB |
2463 | /* |
2464 | * frame is destined for this interface, but if it's | |
2465 | * not also for the previous one we handle that after | |
2466 | * the loop to avoid copying the SKB once too much | |
2467 | */ | |
340e11f3 | 2468 | |
abe60632 JB |
2469 | if (!prev) { |
2470 | prev = sdata; | |
2471 | continue; | |
2472 | } | |
340e11f3 | 2473 | |
4754ffd6 | 2474 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2475 | |
2476 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2477 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2478 | ||
2479 | if (!prepares) | |
2480 | goto next; | |
2481 | ||
2482 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2483 | rx.sdata = prev; | |
2484 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2485 | ieee80211_rx_michael_mic_report(hdr, | |
2486 | &rx); | |
2487 | goto next; | |
2488 | } | |
2489 | ||
abe60632 JB |
2490 | /* |
2491 | * frame was destined for the previous interface | |
2492 | * so invoke RX handlers for it | |
2493 | */ | |
2494 | ||
2495 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2496 | if (!skb_new) { | |
2497 | if (net_ratelimit()) | |
2498 | printk(KERN_DEBUG "%s: failed to copy " | |
2499 | "multicast frame for %s\n", | |
2500 | wiphy_name(local->hw.wiphy), | |
47846c9b | 2501 | prev->name); |
4bb29f8c | 2502 | goto next; |
abe60632 JB |
2503 | } |
2504 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate); | |
4bb29f8c | 2505 | next: |
abe60632 | 2506 | prev = sdata; |
340e11f3 | 2507 | } |
4bb29f8c FF |
2508 | |
2509 | if (prev) { | |
4754ffd6 | 2510 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2511 | |
2512 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2513 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2514 | ||
2515 | if (!prepares) | |
2516 | prev = NULL; | |
2517 | } | |
571ecf67 | 2518 | } |
a4b7d7bd | 2519 | if (prev) |
5f0b7de5 | 2520 | ieee80211_invoke_rx_handlers(prev, &rx, skb, rate); |
a4b7d7bd | 2521 | else |
8e6f0032 | 2522 | dev_kfree_skb(skb); |
571ecf67 | 2523 | } |
6368e4b1 RR |
2524 | |
2525 | /* | |
2526 | * This is the receive path handler. It is called by a low level driver when an | |
2527 | * 802.11 MPDU is received from the hardware. | |
2528 | */ | |
103bf9f7 | 2529 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2530 | { |
2531 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2532 | struct ieee80211_rate *rate = NULL; |
2533 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2534 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2535 | |
d20ef63d JB |
2536 | WARN_ON_ONCE(softirq_count() == 0); |
2537 | ||
77a980dc JB |
2538 | if (WARN_ON(status->band < 0 || |
2539 | status->band >= IEEE80211_NUM_BANDS)) | |
2540 | goto drop; | |
8318d78a JB |
2541 | |
2542 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2543 | if (WARN_ON(!sband)) |
2544 | goto drop; | |
8318d78a | 2545 | |
89c3a8ac JB |
2546 | /* |
2547 | * If we're suspending, it is possible although not too likely | |
2548 | * that we'd be receiving frames after having already partially | |
2549 | * quiesced the stack. We can't process such frames then since | |
2550 | * that might, for example, cause stations to be added or other | |
2551 | * driver callbacks be invoked. | |
2552 | */ | |
77a980dc JB |
2553 | if (unlikely(local->quiescing || local->suspended)) |
2554 | goto drop; | |
89c3a8ac | 2555 | |
ea77f12f JB |
2556 | /* |
2557 | * The same happens when we're not even started, | |
2558 | * but that's worth a warning. | |
2559 | */ | |
77a980dc JB |
2560 | if (WARN_ON(!local->started)) |
2561 | goto drop; | |
ea77f12f | 2562 | |
0fb8ca45 | 2563 | if (status->flag & RX_FLAG_HT) { |
e5d6eb83 LR |
2564 | /* |
2565 | * rate_idx is MCS index, which can be [0-76] as documented on: | |
2566 | * | |
2567 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2568 | * | |
2569 | * Anything else would be some sort of driver or hardware error. | |
2570 | * The driver should catch hardware errors. | |
2571 | */ | |
2572 | if (WARN((status->rate_idx < 0 || | |
2573 | status->rate_idx > 76), | |
2574 | "Rate marked as an HT rate but passed " | |
2575 | "status->rate_idx is not " | |
2576 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2577 | status->rate_idx, | |
2578 | status->rate_idx)) | |
77a980dc | 2579 | goto drop; |
0fb8ca45 JM |
2580 | } else { |
2581 | if (WARN_ON(status->rate_idx < 0 || | |
2582 | status->rate_idx >= sband->n_bitrates)) | |
77a980dc | 2583 | goto drop; |
0fb8ca45 JM |
2584 | rate = &sband->bitrates[status->rate_idx]; |
2585 | } | |
6368e4b1 RR |
2586 | |
2587 | /* | |
2588 | * key references and virtual interfaces are protected using RCU | |
2589 | * and this requires that we are in a read-side RCU section during | |
2590 | * receive processing | |
2591 | */ | |
2592 | rcu_read_lock(); | |
2593 | ||
2594 | /* | |
2595 | * Frames with failed FCS/PLCP checksum are not returned, | |
2596 | * all other frames are returned without radiotap header | |
2597 | * if it was previously present. | |
2598 | * Also, frames with less than 16 bytes are dropped. | |
2599 | */ | |
f1d58c25 | 2600 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2601 | if (!skb) { |
2602 | rcu_read_unlock(); | |
2603 | return; | |
2604 | } | |
2605 | ||
2569a826 | 2606 | __ieee80211_rx_handle_packet(hw, skb, rate); |
6368e4b1 RR |
2607 | |
2608 | rcu_read_unlock(); | |
77a980dc JB |
2609 | |
2610 | return; | |
2611 | drop: | |
2612 | kfree_skb(skb); | |
6368e4b1 | 2613 | } |
103bf9f7 | 2614 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2615 | |
2616 | /* This is a version of the rx handler that can be called from hard irq | |
2617 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2618 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2619 | { |
2620 | struct ieee80211_local *local = hw_to_local(hw); | |
2621 | ||
2622 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2623 | ||
571ecf67 JB |
2624 | skb->pkt_type = IEEE80211_RX_MSG; |
2625 | skb_queue_tail(&local->skb_queue, skb); | |
2626 | tasklet_schedule(&local->tasklet); | |
2627 | } | |
2628 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |