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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 | ||
6d744bac JB |
88 | if (status->flag & RX_FLAG_HT) /* HT info */ |
89 | len += 3; | |
90 | ||
601ae7f2 BR |
91 | return len; |
92 | } | |
93 | ||
d1c3a37c | 94 | /* |
601ae7f2 BR |
95 | * ieee80211_add_rx_radiotap_header - add radiotap header |
96 | * | |
97 | * add a radiotap header containing all the fields which the hardware provided. | |
98 | */ | |
99 | static void | |
100 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
101 | struct sk_buff *skb, | |
601ae7f2 BR |
102 | struct ieee80211_rate *rate, |
103 | int rtap_len) | |
104 | { | |
f1d58c25 | 105 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
106 | struct ieee80211_radiotap_header *rthdr; |
107 | unsigned char *pos; | |
6a86b9c7 | 108 | u16 rx_flags = 0; |
601ae7f2 BR |
109 | |
110 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
111 | memset(rthdr, 0, rtap_len); | |
112 | ||
113 | /* radiotap header, set always present flags */ | |
114 | rthdr->it_present = | |
115 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
116 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
117 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
118 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
119 | rthdr->it_len = cpu_to_le16(rtap_len); | |
120 | ||
121 | pos = (unsigned char *)(rthdr+1); | |
122 | ||
123 | /* the order of the following fields is important */ | |
124 | ||
125 | /* IEEE80211_RADIOTAP_TSFT */ | |
126 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 127 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
128 | rthdr->it_present |= |
129 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
130 | pos += 8; | |
131 | } | |
132 | ||
133 | /* IEEE80211_RADIOTAP_FLAGS */ | |
134 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
135 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
136 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
137 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
138 | if (status->flag & RX_FLAG_SHORTPRE) |
139 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
140 | pos++; |
141 | ||
142 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
143 | if (status->flag & RX_FLAG_HT) { |
144 | /* | |
145 | * TODO: add following information into radiotap header once | |
146 | * suitable fields are defined for it: | |
147 | * - MCS index (status->rate_idx) | |
148 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
149 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
150 | */ | |
151 | *pos = 0; | |
8d6f658e | 152 | } else { |
ebe6c7ba | 153 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 154 | *pos = rate->bitrate / 5; |
8d6f658e | 155 | } |
601ae7f2 BR |
156 | pos++; |
157 | ||
158 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 159 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
160 | pos += 2; |
161 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
162 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
163 | pos); | |
5f0b7de5 JB |
164 | else if (status->flag & RX_FLAG_HT) |
165 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
166 | pos); | |
9deb1ae5 | 167 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
168 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
169 | pos); | |
601ae7f2 | 170 | else |
6a86b9c7 JB |
171 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
172 | pos); | |
601ae7f2 BR |
173 | pos += 2; |
174 | ||
175 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
176 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
177 | *pos = status->signal; | |
178 | rthdr->it_present |= | |
179 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
180 | pos++; | |
181 | } | |
182 | ||
601ae7f2 BR |
183 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
184 | ||
185 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
186 | *pos = status->antenna; | |
187 | pos++; | |
188 | ||
601ae7f2 BR |
189 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
190 | ||
191 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
192 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 193 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 194 | pos++; |
aae89831 | 195 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
196 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
197 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 | 198 | pos += 2; |
6d744bac JB |
199 | |
200 | if (status->flag & RX_FLAG_HT) { | |
201 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); | |
202 | *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS | | |
203 | IEEE80211_RADIOTAP_MCS_HAVE_GI | | |
204 | IEEE80211_RADIOTAP_MCS_HAVE_BW; | |
205 | *pos = 0; | |
206 | if (status->flag & RX_FLAG_SHORT_GI) | |
207 | *pos |= IEEE80211_RADIOTAP_MCS_SGI; | |
208 | if (status->flag & RX_FLAG_40MHZ) | |
209 | *pos |= IEEE80211_RADIOTAP_MCS_BW_40; | |
210 | pos++; | |
211 | *pos++ = status->rate_idx; | |
212 | } | |
601ae7f2 BR |
213 | } |
214 | ||
b2e7771e JB |
215 | /* |
216 | * This function copies a received frame to all monitor interfaces and | |
217 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
218 | * radiotap header the driver might have added. | |
219 | */ | |
220 | static struct sk_buff * | |
221 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 222 | struct ieee80211_rate *rate) |
b2e7771e | 223 | { |
f1d58c25 | 224 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 225 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 226 | int needed_headroom = 0; |
b2e7771e JB |
227 | struct sk_buff *skb, *skb2; |
228 | struct net_device *prev_dev = NULL; | |
229 | int present_fcs_len = 0; | |
b2e7771e JB |
230 | |
231 | /* | |
232 | * First, we may need to make a copy of the skb because | |
233 | * (1) we need to modify it for radiotap (if not present), and | |
234 | * (2) the other RX handlers will modify the skb we got. | |
235 | * | |
236 | * We don't need to, of course, if we aren't going to return | |
237 | * the SKB because it has a bad FCS/PLCP checksum. | |
238 | */ | |
0869aea0 JB |
239 | |
240 | /* room for the radiotap header based on driver features */ | |
241 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
242 | |
243 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
244 | present_fcs_len = FCS_LEN; | |
245 | ||
e3cf8b3f ZY |
246 | /* make sure hdr->frame_control is on the linear part */ |
247 | if (!pskb_may_pull(origskb, 2)) { | |
248 | dev_kfree_skb(origskb); | |
249 | return NULL; | |
250 | } | |
251 | ||
b2e7771e | 252 | if (!local->monitors) { |
0869aea0 | 253 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
254 | dev_kfree_skb(origskb); |
255 | return NULL; | |
256 | } | |
257 | ||
0869aea0 | 258 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
259 | } |
260 | ||
0869aea0 | 261 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
262 | /* only need to expand headroom if necessary */ |
263 | skb = origskb; | |
264 | origskb = NULL; | |
265 | ||
266 | /* | |
267 | * This shouldn't trigger often because most devices have an | |
268 | * RX header they pull before we get here, and that should | |
269 | * be big enough for our radiotap information. We should | |
270 | * probably export the length to drivers so that we can have | |
271 | * them allocate enough headroom to start with. | |
272 | */ | |
273 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 274 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
275 | dev_kfree_skb(skb); |
276 | return NULL; | |
277 | } | |
278 | } else { | |
279 | /* | |
280 | * Need to make a copy and possibly remove radiotap header | |
281 | * and FCS from the original. | |
282 | */ | |
283 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
284 | ||
0869aea0 | 285 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
286 | |
287 | if (!skb) | |
288 | return origskb; | |
289 | } | |
290 | ||
0869aea0 JB |
291 | /* prepend radiotap information */ |
292 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 293 | |
ce3edf6d | 294 | skb_reset_mac_header(skb); |
b2e7771e JB |
295 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296 | skb->pkt_type = PACKET_OTHERHOST; | |
297 | skb->protocol = htons(ETH_P_802_2); | |
298 | ||
299 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 300 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
301 | continue; |
302 | ||
3d30d949 MW |
303 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
304 | continue; | |
305 | ||
9607e6b6 | 306 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
307 | continue; |
308 | ||
b2e7771e JB |
309 | if (prev_dev) { |
310 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
311 | if (skb2) { | |
312 | skb2->dev = prev_dev; | |
5548a8a1 | 313 | netif_receive_skb(skb2); |
b2e7771e JB |
314 | } |
315 | } | |
316 | ||
317 | prev_dev = sdata->dev; | |
318 | sdata->dev->stats.rx_packets++; | |
319 | sdata->dev->stats.rx_bytes += skb->len; | |
320 | } | |
321 | ||
322 | if (prev_dev) { | |
323 | skb->dev = prev_dev; | |
5548a8a1 | 324 | netif_receive_skb(skb); |
b2e7771e JB |
325 | } else |
326 | dev_kfree_skb(skb); | |
327 | ||
328 | return origskb; | |
329 | } | |
330 | ||
331 | ||
5cf121c3 | 332 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 333 | { |
238f74a2 | 334 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 335 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
6e0d114d JB |
336 | int tid; |
337 | ||
338 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
339 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
340 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 341 | /* frame has qos control */ |
238f74a2 HH |
342 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
343 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
554891e6 | 344 | status->rx_flags |= IEEE80211_RX_AMSDU; |
6e0d114d | 345 | } else { |
1411f9b5 JB |
346 | /* |
347 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
348 | * | |
349 | * Sequence numbers for management frames, QoS data | |
350 | * frames with a broadcast/multicast address in the | |
351 | * Address 1 field, and all non-QoS data frames sent | |
352 | * by QoS STAs are assigned using an additional single | |
353 | * modulo-4096 counter, [...] | |
354 | * | |
355 | * We also use that counter for non-QoS STAs. | |
356 | */ | |
357 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 358 | } |
52865dfd | 359 | |
5cf121c3 | 360 | rx->queue = tid; |
6e0d114d JB |
361 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
362 | * For now, set skb->priority to 0 for other cases. */ | |
363 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 364 | } |
6e0d114d | 365 | |
d1c3a37c JB |
366 | /** |
367 | * DOC: Packet alignment | |
368 | * | |
369 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
370 | * to the stack. | |
371 | * | |
372 | * Additionally, should, if possible, align the payload data in a way that | |
373 | * guarantees that the contained IP header is aligned to a four-byte | |
374 | * boundary. In the case of regular frames, this simply means aligning the | |
375 | * payload to a four-byte boundary (because either the IP header is directly | |
376 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
377 | * in front of it). If the payload data is not properly aligned and the |
378 | * architecture doesn't support efficient unaligned operations, mac80211 | |
379 | * will align the data. | |
d1c3a37c JB |
380 | * |
381 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
382 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
383 | * push the IP header further back to a multiple of four again. Thankfully, the | |
384 | * specs were sane enough this time around to require padding each A-MSDU | |
385 | * subframe to a length that is a multiple of four. | |
386 | * | |
387 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
388 | * the payload is not supported, the driver is required to move the 802.11 | |
389 | * header to be directly in front of the payload in that case. | |
390 | */ | |
391 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 392 | { |
59d9cb07 KV |
393 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
394 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
395 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 396 | #endif |
6e0d114d JB |
397 | } |
398 | ||
6368e4b1 | 399 | |
571ecf67 JB |
400 | /* rx handlers */ |
401 | ||
49461622 | 402 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 403 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
404 | { |
405 | struct ieee80211_local *local = rx->local; | |
554891e6 | 406 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
407 | struct sk_buff *skb = rx->skb; |
408 | ||
554891e6 | 409 | if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN))) |
4080c7cd JB |
410 | return RX_CONTINUE; |
411 | ||
412 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) | |
f1d58c25 | 413 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 414 | |
4080c7cd | 415 | if (test_bit(SCAN_SW_SCANNING, &local->scanning)) { |
ece8eddd | 416 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 417 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 418 | dev_kfree_skb(skb); |
9ae54c84 | 419 | return RX_QUEUED; |
571ecf67 JB |
420 | } |
421 | ||
4080c7cd JB |
422 | /* scanning finished during invoking of handlers */ |
423 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
424 | return RX_DROP_UNUSABLE; | |
571ecf67 JB |
425 | } |
426 | ||
3cfcf6ac JM |
427 | |
428 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
429 | { | |
430 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
431 | ||
432 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
433 | return 0; | |
434 | ||
435 | return ieee80211_is_robust_mgmt_frame(hdr); | |
436 | } | |
437 | ||
438 | ||
439 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
440 | { | |
441 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
442 | ||
443 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
444 | return 0; | |
445 | ||
446 | return ieee80211_is_robust_mgmt_frame(hdr); | |
447 | } | |
448 | ||
449 | ||
450 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
451 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
452 | { | |
453 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
454 | struct ieee80211_mmie *mmie; | |
455 | ||
456 | if (skb->len < 24 + sizeof(*mmie) || | |
457 | !is_multicast_ether_addr(hdr->da)) | |
458 | return -1; | |
459 | ||
460 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
461 | return -1; /* not a robust management frame */ | |
462 | ||
463 | mmie = (struct ieee80211_mmie *) | |
464 | (skb->data + skb->len - sizeof(*mmie)); | |
465 | if (mmie->element_id != WLAN_EID_MMIE || | |
466 | mmie->length != sizeof(*mmie) - 2) | |
467 | return -1; | |
468 | ||
469 | return le16_to_cpu(mmie->key_id); | |
470 | } | |
471 | ||
472 | ||
33b64eb2 | 473 | static ieee80211_rx_result |
5cf121c3 | 474 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 475 | { |
a7767f95 HH |
476 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
477 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 478 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 479 | |
a7767f95 | 480 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
481 | if (is_multicast_ether_addr(hdr->addr1)) { |
482 | if (ieee80211_has_tods(hdr->frame_control) || | |
483 | !ieee80211_has_fromds(hdr->frame_control)) | |
484 | return RX_DROP_MONITOR; | |
485 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
486 | return RX_DROP_MONITOR; | |
487 | } else { | |
488 | if (!ieee80211_has_a4(hdr->frame_control)) | |
489 | return RX_DROP_MONITOR; | |
490 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
491 | return RX_DROP_MONITOR; | |
492 | } | |
33b64eb2 LCC |
493 | } |
494 | ||
495 | /* If there is not an established peer link and this is not a peer link | |
496 | * establisment frame, beacon or probe, drop the frame. | |
497 | */ | |
498 | ||
b4e08ea1 | 499 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 500 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 501 | |
a7767f95 | 502 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
503 | return RX_DROP_MONITOR; |
504 | ||
a7767f95 | 505 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 506 | mgmt = (struct ieee80211_mgmt *)hdr; |
97ad9139 | 507 | if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK) |
33b64eb2 | 508 | return RX_DROP_MONITOR; |
33b64eb2 | 509 | return RX_CONTINUE; |
33b64eb2 LCC |
510 | } |
511 | ||
a7767f95 HH |
512 | if (ieee80211_is_probe_req(hdr->frame_control) || |
513 | ieee80211_is_probe_resp(hdr->frame_control) || | |
514 | ieee80211_is_beacon(hdr->frame_control)) | |
515 | return RX_CONTINUE; | |
516 | ||
517 | return RX_DROP_MONITOR; | |
518 | ||
519 | } | |
520 | ||
521 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
522 | ||
523 | if (ieee80211_is_data(hdr->frame_control) && | |
524 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 525 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 526 | return RX_DROP_MONITOR; |
902acc78 | 527 | #undef msh_h_get |
d6d1a5a7 | 528 | |
902acc78 JB |
529 | return RX_CONTINUE; |
530 | } | |
33b64eb2 | 531 | |
1edfb1af JB |
532 | #define SEQ_MODULO 0x1000 |
533 | #define SEQ_MASK 0xfff | |
534 | ||
535 | static inline int seq_less(u16 sq1, u16 sq2) | |
536 | { | |
537 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
538 | } | |
539 | ||
540 | static inline u16 seq_inc(u16 sq) | |
541 | { | |
542 | return (sq + 1) & SEQ_MASK; | |
543 | } | |
544 | ||
545 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
546 | { | |
547 | return (sq1 - sq2) & SEQ_MASK; | |
548 | } | |
549 | ||
550 | ||
551 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
552 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 553 | int index) |
1edfb1af | 554 | { |
24a8fdad | 555 | struct ieee80211_local *local = hw_to_local(hw); |
1edfb1af | 556 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
4cfda47b | 557 | struct ieee80211_rx_status *status; |
1edfb1af | 558 | |
dd318575 JB |
559 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
560 | ||
1edfb1af JB |
561 | if (!skb) |
562 | goto no_frame; | |
563 | ||
071d9ac2 | 564 | /* release the frame from the reorder ring buffer */ |
1edfb1af JB |
565 | tid_agg_rx->stored_mpdu_num--; |
566 | tid_agg_rx->reorder_buf[index] = NULL; | |
4cfda47b CL |
567 | status = IEEE80211_SKB_RXCB(skb); |
568 | status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; | |
24a8fdad | 569 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af JB |
570 | |
571 | no_frame: | |
572 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
573 | } | |
574 | ||
575 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
576 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 577 | u16 head_seq_num) |
1edfb1af JB |
578 | { |
579 | int index; | |
580 | ||
dd318575 JB |
581 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
582 | ||
1edfb1af JB |
583 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
584 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
585 | tid_agg_rx->buf_size; | |
24a8fdad | 586 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
1edfb1af JB |
587 | } |
588 | } | |
589 | ||
590 | /* | |
591 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
592 | * the skb was added to the buffer longer than this time ago, the earlier | |
593 | * frames that have not yet been received are assumed to be lost and the skb | |
594 | * can be released for processing. This may also release other skb's from the | |
595 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
596 | * |
597 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
598 | */ |
599 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
600 | ||
aa0c8636 | 601 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
24a8fdad | 602 | struct tid_ampdu_rx *tid_agg_rx) |
aa0c8636 | 603 | { |
2bff8ebf | 604 | int index, j; |
aa0c8636 | 605 | |
dd318575 JB |
606 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
607 | ||
aa0c8636 CL |
608 | /* release the buffer until next missing frame */ |
609 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
610 | tid_agg_rx->buf_size; | |
611 | if (!tid_agg_rx->reorder_buf[index] && | |
612 | tid_agg_rx->stored_mpdu_num > 1) { | |
613 | /* | |
614 | * No buffers ready to be released, but check whether any | |
615 | * frames in the reorder buffer have timed out. | |
616 | */ | |
aa0c8636 CL |
617 | int skipped = 1; |
618 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
619 | j = (j + 1) % tid_agg_rx->buf_size) { | |
620 | if (!tid_agg_rx->reorder_buf[j]) { | |
621 | skipped++; | |
622 | continue; | |
623 | } | |
624 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
625 | HT_RX_REORDER_BUF_TIMEOUT)) | |
2bff8ebf | 626 | goto set_release_timer; |
aa0c8636 CL |
627 | |
628 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
629 | if (net_ratelimit()) | |
0fb9a9ec JP |
630 | wiphy_debug(hw->wiphy, |
631 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
aa0c8636 | 632 | #endif |
24a8fdad | 633 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
aa0c8636 CL |
634 | |
635 | /* | |
636 | * Increment the head seq# also for the skipped slots. | |
637 | */ | |
638 | tid_agg_rx->head_seq_num = | |
639 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
640 | skipped = 0; | |
641 | } | |
642 | } else while (tid_agg_rx->reorder_buf[index]) { | |
24a8fdad | 643 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
aa0c8636 CL |
644 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
645 | tid_agg_rx->buf_size; | |
646 | } | |
2bff8ebf CL |
647 | |
648 | if (tid_agg_rx->stored_mpdu_num) { | |
649 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
650 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
651 | ||
652 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
653 | j = (j + 1) % tid_agg_rx->buf_size) { | |
654 | if (tid_agg_rx->reorder_buf[j]) | |
655 | break; | |
656 | } | |
657 | ||
658 | set_release_timer: | |
659 | ||
660 | mod_timer(&tid_agg_rx->reorder_timer, | |
661 | tid_agg_rx->reorder_time[j] + | |
662 | HT_RX_REORDER_BUF_TIMEOUT); | |
663 | } else { | |
664 | del_timer(&tid_agg_rx->reorder_timer); | |
665 | } | |
aa0c8636 CL |
666 | } |
667 | ||
1edfb1af JB |
668 | /* |
669 | * As this function belongs to the RX path it must be under | |
670 | * rcu_read_lock protection. It returns false if the frame | |
671 | * can be processed immediately, true if it was consumed. | |
672 | */ | |
673 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
674 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 675 | struct sk_buff *skb) |
1edfb1af JB |
676 | { |
677 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
678 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
679 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
680 | u16 head_seq_num, buf_size; | |
681 | int index; | |
2bff8ebf | 682 | bool ret = true; |
1edfb1af | 683 | |
dd318575 JB |
684 | spin_lock(&tid_agg_rx->reorder_lock); |
685 | ||
1edfb1af JB |
686 | buf_size = tid_agg_rx->buf_size; |
687 | head_seq_num = tid_agg_rx->head_seq_num; | |
688 | ||
689 | /* frame with out of date sequence number */ | |
690 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
691 | dev_kfree_skb(skb); | |
2bff8ebf | 692 | goto out; |
1edfb1af JB |
693 | } |
694 | ||
695 | /* | |
696 | * If frame the sequence number exceeds our buffering window | |
697 | * size release some previous frames to make room for this one. | |
698 | */ | |
699 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
700 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
701 | /* release stored frames up to new head to stack */ | |
24a8fdad | 702 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); |
1edfb1af JB |
703 | } |
704 | ||
705 | /* Now the new frame is always in the range of the reordering buffer */ | |
706 | ||
707 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
708 | ||
709 | /* check if we already stored this frame */ | |
710 | if (tid_agg_rx->reorder_buf[index]) { | |
711 | dev_kfree_skb(skb); | |
2bff8ebf | 712 | goto out; |
1edfb1af JB |
713 | } |
714 | ||
715 | /* | |
716 | * If the current MPDU is in the right order and nothing else | |
717 | * is stored we can process it directly, no need to buffer it. | |
718 | */ | |
719 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
720 | tid_agg_rx->stored_mpdu_num == 0) { | |
721 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
722 | ret = false; |
723 | goto out; | |
1edfb1af JB |
724 | } |
725 | ||
726 | /* put the frame in the reordering buffer */ | |
727 | tid_agg_rx->reorder_buf[index] = skb; | |
728 | tid_agg_rx->reorder_time[index] = jiffies; | |
729 | tid_agg_rx->stored_mpdu_num++; | |
24a8fdad | 730 | ieee80211_sta_reorder_release(hw, tid_agg_rx); |
1edfb1af | 731 | |
2bff8ebf CL |
732 | out: |
733 | spin_unlock(&tid_agg_rx->reorder_lock); | |
734 | return ret; | |
1edfb1af JB |
735 | } |
736 | ||
737 | /* | |
738 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
739 | * true if the MPDU was buffered, false if it should be processed. | |
740 | */ | |
24a8fdad | 741 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) |
1edfb1af | 742 | { |
2569a826 JB |
743 | struct sk_buff *skb = rx->skb; |
744 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
745 | struct ieee80211_hw *hw = &local->hw; |
746 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 747 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
748 | struct tid_ampdu_rx *tid_agg_rx; |
749 | u16 sc; | |
750 | int tid; | |
751 | ||
752 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 753 | goto dont_reorder; |
1edfb1af JB |
754 | |
755 | /* | |
756 | * filter the QoS data rx stream according to | |
757 | * STA/TID and check if this STA/TID is on aggregation | |
758 | */ | |
759 | ||
1edfb1af | 760 | if (!sta) |
2569a826 | 761 | goto dont_reorder; |
1edfb1af JB |
762 | |
763 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
764 | ||
a87f736d JB |
765 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
766 | if (!tid_agg_rx) | |
767 | goto dont_reorder; | |
1edfb1af JB |
768 | |
769 | /* qos null data frames are excluded */ | |
770 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 771 | goto dont_reorder; |
1edfb1af JB |
772 | |
773 | /* new, potentially un-ordered, ampdu frame - process it */ | |
774 | ||
775 | /* reset session timer */ | |
776 | if (tid_agg_rx->timeout) | |
777 | mod_timer(&tid_agg_rx->session_timer, | |
778 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
779 | ||
780 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
781 | sc = le16_to_cpu(hdr->seq_ctrl); | |
782 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 783 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
784 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
785 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 786 | return; |
1edfb1af JB |
787 | } |
788 | ||
a87f736d JB |
789 | /* |
790 | * No locking needed -- we will only ever process one | |
791 | * RX packet at a time, and thus own tid_agg_rx. All | |
792 | * other code manipulating it needs to (and does) make | |
793 | * sure that we cannot get to it any more before doing | |
794 | * anything with it. | |
795 | */ | |
24a8fdad | 796 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) |
2569a826 JB |
797 | return; |
798 | ||
799 | dont_reorder: | |
24a8fdad | 800 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af | 801 | } |
33b64eb2 | 802 | |
49461622 | 803 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 804 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 805 | { |
a7767f95 | 806 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 807 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
808 | |
809 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
810 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 811 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 812 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 813 | hdr->seq_ctrl)) { |
554891e6 | 814 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
815 | rx->local->dot11FrameDuplicateCount++; |
816 | rx->sta->num_duplicates++; | |
817 | } | |
b1f93314 | 818 | return RX_DROP_UNUSABLE; |
571ecf67 | 819 | } else |
5cf121c3 | 820 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
821 | } |
822 | ||
571ecf67 JB |
823 | if (unlikely(rx->skb->len < 16)) { |
824 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 825 | return RX_DROP_MONITOR; |
571ecf67 JB |
826 | } |
827 | ||
571ecf67 JB |
828 | /* Drop disallowed frame classes based on STA auth/assoc state; |
829 | * IEEE 802.11, Chap 5.5. | |
830 | * | |
ccd7b362 JB |
831 | * mac80211 filters only based on association state, i.e. it drops |
832 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
833 | * deauth/disassoc frames when needed. In addition, hostapd is |
834 | * responsible for filtering on both auth and assoc states. | |
835 | */ | |
33b64eb2 | 836 | |
902acc78 | 837 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 838 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 839 | |
a7767f95 HH |
840 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
841 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 842 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
1be7fe8d | 843 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && |
07346f81 | 844 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
845 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
846 | !ieee80211_has_tods(hdr->frame_control) && | |
847 | ieee80211_is_data(hdr->frame_control)) || | |
554891e6 | 848 | !(status->rx_flags & IEEE80211_RX_RA_MATCH)) { |
571ecf67 JB |
849 | /* Drop IBSS frames and frames for other hosts |
850 | * silently. */ | |
e4c26add | 851 | return RX_DROP_MONITOR; |
571ecf67 JB |
852 | } |
853 | ||
e4c26add | 854 | return RX_DROP_MONITOR; |
571ecf67 JB |
855 | } |
856 | ||
9ae54c84 | 857 | return RX_CONTINUE; |
570bd537 JB |
858 | } |
859 | ||
860 | ||
49461622 | 861 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 862 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 863 | { |
eb9fb5b8 JB |
864 | struct sk_buff *skb = rx->skb; |
865 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
866 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
867 | int keyidx; |
868 | int hdrlen; | |
e4c26add | 869 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
e31b8213 | 870 | struct ieee80211_key *sta_ptk = NULL; |
3cfcf6ac | 871 | int mmie_keyidx = -1; |
761ab470 | 872 | __le16 fc; |
570bd537 | 873 | |
3017b80b JB |
874 | /* |
875 | * Key selection 101 | |
876 | * | |
3cfcf6ac | 877 | * There are four types of keys: |
3017b80b | 878 | * - GTK (group keys) |
3cfcf6ac | 879 | * - IGTK (group keys for management frames) |
3017b80b JB |
880 | * - PTK (pairwise keys) |
881 | * - STK (station-to-station pairwise keys) | |
882 | * | |
883 | * When selecting a key, we have to distinguish between multicast | |
884 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
885 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
886 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
887 | * unicast frames can also use key indices like GTKs. Hence, if we | |
888 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 889 | * |
8dc06a1c JB |
890 | * Note that in a regular BSS, multicast frames are sent by the |
891 | * AP only, associated stations unicast the frame to the AP first | |
892 | * which then multicasts it on their behalf. | |
893 | * | |
3017b80b JB |
894 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
895 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
896 | * The spec seems to expect that one negotiates the same key with |
897 | * every station but there's no such requirement; VLANs could be | |
898 | * possible. | |
3017b80b JB |
899 | */ |
900 | ||
3017b80b | 901 | /* |
1990af8d | 902 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
903 | * addressed to us nor a multicast frame. |
904 | */ | |
554891e6 | 905 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 906 | return RX_CONTINUE; |
3017b80b | 907 | |
2569a826 JB |
908 | /* start without a key */ |
909 | rx->key = NULL; | |
910 | ||
d4e46a3d | 911 | if (rx->sta) |
e31b8213 | 912 | sta_ptk = rcu_dereference(rx->sta->ptk); |
d4e46a3d | 913 | |
761ab470 JB |
914 | fc = hdr->frame_control; |
915 | ||
916 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
917 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
918 | ||
e31b8213 JB |
919 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
920 | rx->key = sta_ptk; | |
dc1580dd JB |
921 | if ((status->flag & RX_FLAG_DECRYPTED) && |
922 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
923 | return RX_CONTINUE; | |
0c7c10c7 | 924 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 925 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 926 | return RX_CONTINUE; |
3cfcf6ac JM |
927 | } else if (mmie_keyidx >= 0) { |
928 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
929 | if ((status->flag & RX_FLAG_DECRYPTED) && |
930 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
931 | return RX_CONTINUE; |
932 | ||
933 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
934 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
935 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
e31b8213 JB |
936 | if (rx->sta) |
937 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
938 | if (!rx->key) | |
939 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 940 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
941 | /* |
942 | * The frame was not protected, so skip decryption. However, we | |
943 | * need to set rx->key if there is a key that could have been | |
944 | * used so that the frame may be dropped if encryption would | |
945 | * have been expected. | |
946 | */ | |
947 | struct ieee80211_key *key = NULL; | |
897bed8b JB |
948 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
949 | int i; | |
950 | ||
761ab470 | 951 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
952 | is_multicast_ether_addr(hdr->addr1) && |
953 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
954 | rx->key = key; | |
897bed8b JB |
955 | else { |
956 | if (rx->sta) { | |
957 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
958 | key = rcu_dereference(rx->sta->gtk[i]); | |
959 | if (key) | |
960 | break; | |
961 | } | |
962 | } | |
963 | if (!key) { | |
964 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
965 | key = rcu_dereference(sdata->keys[i]); | |
966 | if (key) | |
967 | break; | |
968 | } | |
969 | } | |
970 | if (key) | |
971 | rx->key = key; | |
972 | } | |
0c7c10c7 | 973 | return RX_CONTINUE; |
571ecf67 | 974 | } else { |
39184b15 | 975 | u8 keyid; |
3017b80b JB |
976 | /* |
977 | * The device doesn't give us the IV so we won't be | |
978 | * able to look up the key. That's ok though, we | |
979 | * don't need to decrypt the frame, we just won't | |
980 | * be able to keep statistics accurate. | |
981 | * Except for key threshold notifications, should | |
982 | * we somehow allow the driver to tell us which key | |
983 | * the hardware used if this flag is set? | |
984 | */ | |
eb9fb5b8 JB |
985 | if ((status->flag & RX_FLAG_DECRYPTED) && |
986 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 987 | return RX_CONTINUE; |
3017b80b | 988 | |
761ab470 | 989 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
990 | |
991 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 992 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
993 | |
994 | /* | |
995 | * no need to call ieee80211_wep_get_keyidx, | |
996 | * it verifies a bunch of things we've done already | |
997 | */ | |
39184b15 ZY |
998 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
999 | keyidx = keyid >> 6; | |
3017b80b | 1000 | |
e31b8213 JB |
1001 | /* check per-station GTK first, if multicast packet */ |
1002 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
1003 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
3017b80b | 1004 | |
e31b8213 JB |
1005 | /* if not found, try default key */ |
1006 | if (!rx->key) { | |
1007 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
1008 | ||
1009 | /* | |
1010 | * RSNA-protected unicast frames should always be | |
1011 | * sent with pairwise or station-to-station keys, | |
1012 | * but for WEP we allow using a key index as well. | |
1013 | */ | |
1014 | if (rx->key && | |
1015 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
1016 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1017 | !is_multicast_ether_addr(hdr->addr1)) | |
1018 | rx->key = NULL; | |
1019 | } | |
571ecf67 JB |
1020 | } |
1021 | ||
3017b80b | 1022 | if (rx->key) { |
571ecf67 | 1023 | rx->key->tx_rx_count++; |
011bfcc4 | 1024 | /* TODO: add threshold stuff again */ |
1990af8d | 1025 | } else { |
e4c26add | 1026 | return RX_DROP_MONITOR; |
70f08765 JB |
1027 | } |
1028 | ||
39184b15 ZY |
1029 | if (skb_linearize(rx->skb)) |
1030 | return RX_DROP_UNUSABLE; | |
761ab470 | 1031 | /* the hdr variable is invalid now! */ |
1990af8d | 1032 | |
97359d12 JB |
1033 | switch (rx->key->conf.cipher) { |
1034 | case WLAN_CIPHER_SUITE_WEP40: | |
1035 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
1036 | /* Check for weak IVs if possible */ |
1037 | if (rx->sta && ieee80211_is_data(fc) && | |
1038 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
1039 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1040 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
1041 | rx->sta->wep_weak_iv_count++; | |
1042 | ||
e2f036da MN |
1043 | result = ieee80211_crypto_wep_decrypt(rx); |
1044 | break; | |
97359d12 | 1045 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
1046 | result = ieee80211_crypto_tkip_decrypt(rx); |
1047 | break; | |
97359d12 | 1048 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1049 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1050 | break; | |
97359d12 | 1051 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1052 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1053 | break; | |
3ffc2a90 JB |
1054 | default: |
1055 | /* | |
1056 | * We can reach here only with HW-only algorithms | |
1057 | * but why didn't it decrypt the frame?! | |
1058 | */ | |
1059 | return RX_DROP_UNUSABLE; | |
70f08765 JB |
1060 | } |
1061 | ||
e2f036da | 1062 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1063 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1064 | |
1065 | return result; | |
70f08765 JB |
1066 | } |
1067 | ||
572e0012 KV |
1068 | static ieee80211_rx_result debug_noinline |
1069 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1070 | { | |
1071 | struct ieee80211_local *local; | |
1072 | struct ieee80211_hdr *hdr; | |
1073 | struct sk_buff *skb; | |
1074 | ||
1075 | local = rx->local; | |
1076 | skb = rx->skb; | |
1077 | hdr = (struct ieee80211_hdr *) skb->data; | |
1078 | ||
1079 | if (!local->pspolling) | |
1080 | return RX_CONTINUE; | |
1081 | ||
1082 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1083 | /* this is not from AP */ | |
1084 | return RX_CONTINUE; | |
1085 | ||
1086 | if (!ieee80211_is_data(hdr->frame_control)) | |
1087 | return RX_CONTINUE; | |
1088 | ||
1089 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1090 | /* AP has no more frames buffered for us */ | |
1091 | local->pspolling = false; | |
1092 | return RX_CONTINUE; | |
1093 | } | |
1094 | ||
1095 | /* more data bit is set, let's request a new frame from the AP */ | |
1096 | ieee80211_send_pspoll(local, rx->sdata); | |
1097 | ||
1098 | return RX_CONTINUE; | |
1099 | } | |
1100 | ||
133b8226 | 1101 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1102 | { |
133b8226 | 1103 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1104 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1105 | |
3e122be0 | 1106 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1107 | set_sta_flags(sta, WLAN_STA_PS_STA); |
d057e5a3 AN |
1108 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
1109 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 1110 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1111 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1112 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1113 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1114 | } | |
1115 | ||
ff9458d3 | 1116 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1117 | { |
133b8226 | 1118 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1119 | |
3e122be0 | 1120 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1121 | |
571ecf67 | 1122 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1123 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1124 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1125 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1126 | |
af818581 | 1127 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1128 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1129 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1130 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1131 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1132 | return; |
1133 | } | |
1134 | ||
1135 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1136 | } |
1137 | ||
d057e5a3 AN |
1138 | int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) |
1139 | { | |
1140 | struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); | |
1141 | bool in_ps; | |
1142 | ||
1143 | WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); | |
1144 | ||
1145 | /* Don't let the same PS state be set twice */ | |
1146 | in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA); | |
1147 | if ((start && in_ps) || (!start && !in_ps)) | |
1148 | return -EINVAL; | |
1149 | ||
1150 | if (start) | |
1151 | ap_sta_ps_start(sta_inf); | |
1152 | else | |
1153 | ap_sta_ps_end(sta_inf); | |
1154 | ||
1155 | return 0; | |
1156 | } | |
1157 | EXPORT_SYMBOL(ieee80211_sta_ps_transition); | |
1158 | ||
49461622 | 1159 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1160 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1161 | { |
1162 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1163 | struct sk_buff *skb = rx->skb; |
1164 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1165 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1166 | |
1167 | if (!sta) | |
9ae54c84 | 1168 | return RX_CONTINUE; |
571ecf67 | 1169 | |
b291ba11 JB |
1170 | /* |
1171 | * Update last_rx only for IBSS packets which are for the current | |
1172 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1173 | * where other STAs start using different BSSID. | |
1174 | */ | |
05c914fe | 1175 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1176 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1177 | NL80211_IFTYPE_ADHOC); |
46900298 | 1178 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1179 | sta->last_rx = jiffies; |
b291ba11 JB |
1180 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1181 | /* | |
33b64eb2 LCC |
1182 | * Mesh beacons will update last_rx when if they are found to |
1183 | * match the current local configuration when processed. | |
571ecf67 | 1184 | */ |
b291ba11 | 1185 | sta->last_rx = jiffies; |
571ecf67 JB |
1186 | } |
1187 | ||
554891e6 | 1188 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1189 | return RX_CONTINUE; |
571ecf67 | 1190 | |
3cf335d5 KV |
1191 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1192 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1193 | ||
571ecf67 JB |
1194 | sta->rx_fragments++; |
1195 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1196 | sta->last_signal = status->signal; |
541a45a1 | 1197 | ewma_add(&sta->avg_signal, -status->signal); |
571ecf67 | 1198 | |
72eaa43a JB |
1199 | /* |
1200 | * Change STA power saving mode only at the end of a frame | |
1201 | * exchange sequence. | |
1202 | */ | |
d057e5a3 AN |
1203 | if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && |
1204 | !ieee80211_has_morefrags(hdr->frame_control) && | |
4cfda47b | 1205 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
05c914fe JB |
1206 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1207 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1208 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1209 | /* |
1210 | * Ignore doze->wake transitions that are | |
1211 | * indicated by non-data frames, the standard | |
1212 | * is unclear here, but for example going to | |
1213 | * PS mode and then scanning would cause a | |
1214 | * doze->wake transition for the probe request, | |
1215 | * and that is clearly undesirable. | |
1216 | */ | |
1217 | if (ieee80211_is_data(hdr->frame_control) && | |
1218 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1219 | ap_sta_ps_end(sta); |
72eaa43a JB |
1220 | } else { |
1221 | if (ieee80211_has_pm(hdr->frame_control)) | |
1222 | ap_sta_ps_start(sta); | |
1223 | } | |
571ecf67 JB |
1224 | } |
1225 | ||
22403def JB |
1226 | /* |
1227 | * Drop (qos-)data::nullfunc frames silently, since they | |
1228 | * are used only to control station power saving mode. | |
1229 | */ | |
1230 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1231 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1232 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1233 | |
1234 | /* | |
1235 | * If we receive a 4-addr nullfunc frame from a STA | |
1236 | * that was not moved to a 4-addr STA vlan yet, drop | |
1237 | * the frame to the monitor interface, to make sure | |
1238 | * that hostapd sees it | |
1239 | */ | |
1240 | if (ieee80211_has_a4(hdr->frame_control) && | |
1241 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1242 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1243 | !rx->sdata->u.vlan.sta))) | |
1244 | return RX_DROP_MONITOR; | |
22403def JB |
1245 | /* |
1246 | * Update counter and free packet here to avoid | |
1247 | * counting this as a dropped packed. | |
1248 | */ | |
571ecf67 JB |
1249 | sta->rx_packets++; |
1250 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1251 | return RX_QUEUED; |
571ecf67 JB |
1252 | } |
1253 | ||
9ae54c84 | 1254 | return RX_CONTINUE; |
571ecf67 JB |
1255 | } /* ieee80211_rx_h_sta_process */ |
1256 | ||
571ecf67 JB |
1257 | static inline struct ieee80211_fragment_entry * |
1258 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1259 | unsigned int frag, unsigned int seq, int rx_queue, | |
1260 | struct sk_buff **skb) | |
1261 | { | |
1262 | struct ieee80211_fragment_entry *entry; | |
1263 | int idx; | |
1264 | ||
1265 | idx = sdata->fragment_next; | |
1266 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1267 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1268 | sdata->fragment_next = 0; | |
1269 | ||
1270 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1271 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1272 | struct ieee80211_hdr *hdr = |
1273 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1274 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1275 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1276 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1277 | sdata->name, idx, |
571ecf67 | 1278 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1279 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1280 | #endif |
571ecf67 JB |
1281 | __skb_queue_purge(&entry->skb_list); |
1282 | } | |
1283 | ||
1284 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1285 | *skb = NULL; | |
1286 | entry->first_frag_time = jiffies; | |
1287 | entry->seq = seq; | |
1288 | entry->rx_queue = rx_queue; | |
1289 | entry->last_frag = frag; | |
1290 | entry->ccmp = 0; | |
1291 | entry->extra_len = 0; | |
1292 | ||
1293 | return entry; | |
1294 | } | |
1295 | ||
1296 | static inline struct ieee80211_fragment_entry * | |
1297 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1298 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1299 | int rx_queue, struct ieee80211_hdr *hdr) |
1300 | { | |
1301 | struct ieee80211_fragment_entry *entry; | |
1302 | int i, idx; | |
1303 | ||
1304 | idx = sdata->fragment_next; | |
1305 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1306 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1307 | |
1308 | idx--; | |
1309 | if (idx < 0) | |
1310 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1311 | ||
1312 | entry = &sdata->fragments[idx]; | |
1313 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1314 | entry->rx_queue != rx_queue || | |
1315 | entry->last_frag + 1 != frag) | |
1316 | continue; | |
1317 | ||
b73d70ad | 1318 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1319 | |
b73d70ad HH |
1320 | /* |
1321 | * Check ftype and addresses are equal, else check next fragment | |
1322 | */ | |
1323 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1324 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1325 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1326 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1327 | continue; | |
1328 | ||
ab46623e | 1329 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1330 | __skb_queue_purge(&entry->skb_list); |
1331 | continue; | |
1332 | } | |
1333 | return entry; | |
1334 | } | |
1335 | ||
1336 | return NULL; | |
1337 | } | |
1338 | ||
49461622 | 1339 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1340 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1341 | { |
1342 | struct ieee80211_hdr *hdr; | |
1343 | u16 sc; | |
358c8d9d | 1344 | __le16 fc; |
571ecf67 JB |
1345 | unsigned int frag, seq; |
1346 | struct ieee80211_fragment_entry *entry; | |
1347 | struct sk_buff *skb; | |
554891e6 | 1348 | struct ieee80211_rx_status *status; |
571ecf67 | 1349 | |
b73d70ad | 1350 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1351 | fc = hdr->frame_control; |
571ecf67 JB |
1352 | sc = le16_to_cpu(hdr->seq_ctrl); |
1353 | frag = sc & IEEE80211_SCTL_FRAG; | |
1354 | ||
358c8d9d | 1355 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1356 | (rx->skb)->len < 24 || |
1357 | is_multicast_ether_addr(hdr->addr1))) { | |
1358 | /* not fragmented */ | |
1359 | goto out; | |
1360 | } | |
1361 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1362 | ||
e3cf8b3f ZY |
1363 | if (skb_linearize(rx->skb)) |
1364 | return RX_DROP_UNUSABLE; | |
1365 | ||
058897a4 AK |
1366 | /* |
1367 | * skb_linearize() might change the skb->data and | |
1368 | * previously cached variables (in this case, hdr) need to | |
1369 | * be refreshed with the new data. | |
1370 | */ | |
1371 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1372 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1373 | ||
1374 | if (frag == 0) { | |
1375 | /* This is the first fragment of a new frame. */ | |
1376 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1377 | rx->queue, &(rx->skb)); |
97359d12 | 1378 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1379 | ieee80211_has_protected(fc)) { |
9190252c JM |
1380 | int queue = ieee80211_is_mgmt(fc) ? |
1381 | NUM_RX_DATA_QUEUES : rx->queue; | |
571ecf67 JB |
1382 | /* Store CCMP PN so that we can verify that the next |
1383 | * fragment has a sequential PN value. */ | |
1384 | entry->ccmp = 1; | |
1385 | memcpy(entry->last_pn, | |
9190252c | 1386 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1387 | CCMP_PN_LEN); |
1388 | } | |
9ae54c84 | 1389 | return RX_QUEUED; |
571ecf67 JB |
1390 | } |
1391 | ||
1392 | /* This is a fragment for a frame that should already be pending in | |
1393 | * fragment cache. Add this fragment to the end of the pending entry. | |
1394 | */ | |
b73d70ad | 1395 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1396 | if (!entry) { |
1397 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1398 | return RX_DROP_MONITOR; |
571ecf67 JB |
1399 | } |
1400 | ||
1401 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1402 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1403 | if (entry->ccmp) { | |
1404 | int i; | |
1405 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1406 | int queue; |
97359d12 | 1407 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1408 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1409 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1410 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1411 | pn[i]++; | |
1412 | if (pn[i]) | |
1413 | break; | |
1414 | } | |
9190252c JM |
1415 | queue = ieee80211_is_mgmt(fc) ? |
1416 | NUM_RX_DATA_QUEUES : rx->queue; | |
1417 | rpn = rx->key->u.ccmp.rx_pn[queue]; | |
f4ea83dd | 1418 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1419 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1420 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1421 | } | |
1422 | ||
358c8d9d | 1423 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1424 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1425 | entry->last_frag = frag; | |
1426 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1427 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1428 | rx->skb = NULL; |
9ae54c84 | 1429 | return RX_QUEUED; |
571ecf67 JB |
1430 | } |
1431 | ||
1432 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1433 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1434 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1435 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1436 | GFP_ATOMIC))) { | |
1437 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1438 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1439 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1440 | } |
1441 | } | |
1442 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1443 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1444 | dev_kfree_skb(skb); | |
1445 | } | |
1446 | ||
1447 | /* Complete frame has been reassembled - process it now */ | |
554891e6 JB |
1448 | status = IEEE80211_SKB_RXCB(rx->skb); |
1449 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
571ecf67 JB |
1450 | |
1451 | out: | |
1452 | if (rx->sta) | |
1453 | rx->sta->rx_packets++; | |
1454 | if (is_multicast_ether_addr(hdr->addr1)) | |
1455 | rx->local->dot11MulticastReceivedFrameCount++; | |
1456 | else | |
1457 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1458 | return RX_CONTINUE; |
571ecf67 JB |
1459 | } |
1460 | ||
49461622 | 1461 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1462 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1463 | { |
af818581 | 1464 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1465 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
554891e6 | 1466 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1467 | |
358c8d9d | 1468 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
554891e6 | 1469 | !(status->rx_flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1470 | return RX_CONTINUE; |
571ecf67 | 1471 | |
05c914fe JB |
1472 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1473 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1474 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1475 | |
af818581 JB |
1476 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1477 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1478 | else | |
1479 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1480 | |
9ae54c84 | 1481 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1482 | * count as an dropped frame. */ |
1483 | dev_kfree_skb(rx->skb); | |
1484 | ||
9ae54c84 | 1485 | return RX_QUEUED; |
571ecf67 JB |
1486 | } |
1487 | ||
49461622 | 1488 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1489 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1490 | { |
6e0d114d | 1491 | u8 *data = rx->skb->data; |
238f74a2 | 1492 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1493 | |
238f74a2 | 1494 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1495 | return RX_CONTINUE; |
6e0d114d JB |
1496 | |
1497 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1498 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1499 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1500 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1501 | /* change frame type to non QOS */ |
238f74a2 | 1502 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1503 | |
9ae54c84 | 1504 | return RX_CONTINUE; |
6e0d114d JB |
1505 | } |
1506 | ||
76ee65bf | 1507 | static int |
5cf121c3 | 1508 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1509 | { |
07346f81 | 1510 | if (unlikely(!rx->sta || |
f4ea83dd | 1511 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1512 | return -EACCES; |
571ecf67 | 1513 | |
76ee65bf | 1514 | return 0; |
571ecf67 JB |
1515 | } |
1516 | ||
76ee65bf | 1517 | static int |
358c8d9d | 1518 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1519 | { |
eb9fb5b8 JB |
1520 | struct sk_buff *skb = rx->skb; |
1521 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1522 | ||
3017b80b | 1523 | /* |
7848ba7d JB |
1524 | * Pass through unencrypted frames if the hardware has |
1525 | * decrypted them already. | |
3017b80b | 1526 | */ |
eb9fb5b8 | 1527 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1528 | return 0; |
571ecf67 JB |
1529 | |
1530 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1531 | if (unlikely(!ieee80211_has_protected(fc) && |
1532 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1533 | ieee80211_is_data(fc) && |
b3fc9c6c | 1534 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1535 | return -EACCES; |
bef5d1c7 JB |
1536 | |
1537 | return 0; | |
1538 | } | |
1539 | ||
1540 | static int | |
1541 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1542 | { | |
1543 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1544 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1545 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1546 | |
e3efca0a JM |
1547 | /* |
1548 | * Pass through unencrypted frames if the hardware has | |
1549 | * decrypted them already. | |
1550 | */ | |
1551 | if (status->flag & RX_FLAG_DECRYPTED) | |
1552 | return 0; | |
bef5d1c7 | 1553 | |
f2ca3ea4 | 1554 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1555 | if (unlikely(!ieee80211_has_protected(fc) && |
1556 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
cf4e594e JM |
1557 | rx->key)) { |
1558 | if (ieee80211_is_deauth(fc)) | |
1559 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1560 | rx->skb->data, | |
1561 | rx->skb->len); | |
1562 | else if (ieee80211_is_disassoc(fc)) | |
1563 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1564 | rx->skb->data, | |
1565 | rx->skb->len); | |
f2ca3ea4 | 1566 | return -EACCES; |
cf4e594e | 1567 | } |
f2ca3ea4 | 1568 | /* BIP does not use Protected field, so need to check MMIE */ |
f64f9e71 | 1569 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
cf4e594e JM |
1570 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
1571 | if (ieee80211_is_deauth(fc)) | |
1572 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1573 | rx->skb->data, | |
1574 | rx->skb->len); | |
1575 | else if (ieee80211_is_disassoc(fc)) | |
1576 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1577 | rx->skb->data, | |
1578 | rx->skb->len); | |
f2ca3ea4 | 1579 | return -EACCES; |
cf4e594e | 1580 | } |
f2ca3ea4 JM |
1581 | /* |
1582 | * When using MFP, Action frames are not allowed prior to | |
1583 | * having configured keys. | |
1584 | */ | |
1585 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1586 | ieee80211_is_robust_mgmt_frame( | |
1587 | (struct ieee80211_hdr *) rx->skb->data))) | |
1588 | return -EACCES; | |
1589 | } | |
b3fc9c6c | 1590 | |
76ee65bf | 1591 | return 0; |
571ecf67 JB |
1592 | } |
1593 | ||
76ee65bf | 1594 | static int |
e31a16d6 | 1595 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1596 | { |
eb9fb5b8 | 1597 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee | 1598 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
fbb327c5 FF |
1599 | bool check_port_control = false; |
1600 | struct ethhdr *ehdr; | |
1601 | int ret; | |
f14543ee | 1602 | |
9bc383de JB |
1603 | if (ieee80211_has_a4(hdr->frame_control) && |
1604 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1605 | return -1; |
9bc383de | 1606 | |
fbb327c5 FF |
1607 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
1608 | !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { | |
1609 | ||
1610 | if (!sdata->u.mgd.use_4addr) | |
1611 | return -1; | |
1612 | else | |
1613 | check_port_control = true; | |
1614 | } | |
1615 | ||
9bc383de | 1616 | if (is_multicast_ether_addr(hdr->addr1) && |
fbb327c5 | 1617 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) |
f14543ee | 1618 | return -1; |
571ecf67 | 1619 | |
fbb327c5 FF |
1620 | ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
1621 | if (ret < 0 || !check_port_control) | |
1622 | return ret; | |
1623 | ||
1624 | ehdr = (struct ethhdr *) rx->skb->data; | |
1625 | if (ehdr->h_proto != rx->sdata->control_port_protocol) | |
1626 | return -1; | |
1627 | ||
1628 | return 0; | |
76ee65bf | 1629 | } |
571ecf67 | 1630 | |
ce3edf6d JB |
1631 | /* |
1632 | * requires that rx->skb is a frame with ethernet header | |
1633 | */ | |
358c8d9d | 1634 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1635 | { |
c97c23e3 | 1636 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1637 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1638 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1639 | ||
1640 | /* | |
1641 | * Allow EAPOL frames to us/the PAE group address regardless | |
1642 | * of whether the frame was encrypted or not. | |
1643 | */ | |
a621fa4d | 1644 | if (ehdr->h_proto == rx->sdata->control_port_protocol && |
47846c9b | 1645 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1646 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1647 | return true; | |
1648 | ||
1649 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1650 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1651 | return false; |
1652 | ||
1653 | return true; | |
1654 | } | |
1655 | ||
1656 | /* | |
1657 | * requires that rx->skb is a frame with ethernet header | |
1658 | */ | |
76ee65bf | 1659 | static void |
5cf121c3 | 1660 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1661 | { |
eb9fb5b8 JB |
1662 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1663 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1664 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1665 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1666 | struct sta_info *dsta; | |
554891e6 | 1667 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1668 | |
76ee65bf RR |
1669 | skb = rx->skb; |
1670 | xmit_skb = NULL; | |
571ecf67 | 1671 | |
05c914fe JB |
1672 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1673 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1674 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
554891e6 | 1675 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
9bc383de | 1676 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
ce3edf6d JB |
1677 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1678 | /* | |
1679 | * send multicast frames both to higher layers in | |
1680 | * local net stack and back to the wireless medium | |
1681 | */ | |
76ee65bf RR |
1682 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1683 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1684 | printk(KERN_DEBUG "%s: failed to clone " |
1685 | "multicast frame\n", dev->name); | |
1686 | } else { | |
abe60632 JB |
1687 | dsta = sta_info_get(sdata, skb->data); |
1688 | if (dsta) { | |
ce3edf6d JB |
1689 | /* |
1690 | * The destination station is associated to | |
1691 | * this AP (in this VLAN), so send the frame | |
1692 | * directly to it and do not pass it to local | |
1693 | * net stack. | |
571ecf67 | 1694 | */ |
76ee65bf | 1695 | xmit_skb = skb; |
571ecf67 JB |
1696 | skb = NULL; |
1697 | } | |
571ecf67 JB |
1698 | } |
1699 | } | |
1700 | ||
1701 | if (skb) { | |
d1c3a37c JB |
1702 | int align __maybe_unused; |
1703 | ||
59d9cb07 | 1704 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1705 | /* |
1706 | * 'align' will only take the values 0 or 2 here | |
1707 | * since all frames are required to be aligned | |
1708 | * to 2-byte boundaries when being passed to | |
1709 | * mac80211. That also explains the __skb_push() | |
1710 | * below. | |
1711 | */ | |
dacb6f1d | 1712 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1713 | if (align) { |
1714 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1715 | dev_kfree_skb(skb); | |
1716 | skb = NULL; | |
1717 | } else { | |
1718 | u8 *data = skb->data; | |
8ce0b589 ZY |
1719 | size_t len = skb_headlen(skb); |
1720 | skb->data -= align; | |
1721 | memmove(skb->data, data, len); | |
1722 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1723 | } |
1724 | } | |
1725 | #endif | |
1726 | ||
1727 | if (skb) { | |
1728 | /* deliver to local stack */ | |
1729 | skb->protocol = eth_type_trans(skb, dev); | |
1730 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1731 | netif_receive_skb(skb); |
d1c3a37c | 1732 | } |
571ecf67 JB |
1733 | } |
1734 | ||
76ee65bf | 1735 | if (xmit_skb) { |
571ecf67 | 1736 | /* send to wireless media */ |
f831e909 | 1737 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1738 | skb_reset_network_header(xmit_skb); |
1739 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1740 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1741 | } |
76ee65bf RR |
1742 | } |
1743 | ||
49461622 | 1744 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1745 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1746 | { |
eb9fb5b8 | 1747 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1748 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1749 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1750 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1751 | struct sk_buff_head frame_list; |
554891e6 | 1752 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
fd4c7f2f | 1753 | |
358c8d9d | 1754 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1755 | return RX_CONTINUE; |
fd4c7f2f | 1756 | |
358c8d9d | 1757 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1758 | return RX_DROP_MONITOR; |
fd4c7f2f | 1759 | |
554891e6 | 1760 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1761 | return RX_CONTINUE; |
fd4c7f2f | 1762 | |
eaf85ca7 ZY |
1763 | if (ieee80211_has_a4(hdr->frame_control) && |
1764 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1765 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1766 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1767 | |
eaf85ca7 ZY |
1768 | if (is_multicast_ether_addr(hdr->addr1) && |
1769 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1770 | rx->sdata->u.vlan.sta) || | |
1771 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1772 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1773 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1774 | |
eaf85ca7 ZY |
1775 | skb->dev = dev; |
1776 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1777 | |
e3cf8b3f ZY |
1778 | if (skb_linearize(skb)) |
1779 | return RX_DROP_UNUSABLE; | |
1780 | ||
eaf85ca7 ZY |
1781 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1782 | rx->sdata->vif.type, | |
1783 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1784 | |
eaf85ca7 ZY |
1785 | while (!skb_queue_empty(&frame_list)) { |
1786 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1787 | |
358c8d9d | 1788 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1789 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1790 | continue; |
1791 | } | |
eaf85ca7 ZY |
1792 | dev->stats.rx_packets++; |
1793 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1794 | |
1795 | ieee80211_deliver_skb(rx); | |
1796 | } | |
1797 | ||
9ae54c84 | 1798 | return RX_QUEUED; |
fd4c7f2f RR |
1799 | } |
1800 | ||
bf94e17b | 1801 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1802 | static ieee80211_rx_result |
e32f85f7 LCC |
1803 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1804 | { | |
1805 | struct ieee80211_hdr *hdr; | |
1806 | struct ieee80211s_hdr *mesh_hdr; | |
1807 | unsigned int hdrlen; | |
1808 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1809 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1810 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
554891e6 | 1811 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
e32f85f7 LCC |
1812 | |
1813 | hdr = (struct ieee80211_hdr *) skb->data; | |
1814 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1815 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1816 | ||
1817 | if (!ieee80211_is_data(hdr->frame_control)) | |
1818 | return RX_CONTINUE; | |
1819 | ||
1820 | if (!mesh_hdr->ttl) | |
1821 | /* illegal frame */ | |
1822 | return RX_DROP_MONITOR; | |
1823 | ||
43b7b314 | 1824 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1825 | struct mesh_path *mppath; |
43b7b314 JC |
1826 | char *proxied_addr; |
1827 | char *mpp_addr; | |
1828 | ||
1829 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1830 | mpp_addr = hdr->addr3; | |
1831 | proxied_addr = mesh_hdr->eaddr1; | |
1832 | } else { | |
1833 | mpp_addr = hdr->addr4; | |
1834 | proxied_addr = mesh_hdr->eaddr2; | |
1835 | } | |
79617dee | 1836 | |
79617dee | 1837 | rcu_read_lock(); |
43b7b314 | 1838 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1839 | if (!mppath) { |
43b7b314 | 1840 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1841 | } else { |
1842 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1843 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1844 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1845 | spin_unlock_bh(&mppath->state_lock); |
1846 | } | |
1847 | rcu_read_unlock(); | |
1848 | } | |
1849 | ||
3c5772a5 JC |
1850 | /* Frame has reached destination. Don't forward */ |
1851 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1852 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1853 | return RX_CONTINUE; |
1854 | ||
1855 | mesh_hdr->ttl--; | |
1856 | ||
554891e6 | 1857 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
e32f85f7 | 1858 | if (!mesh_hdr->ttl) |
472dbc45 | 1859 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1860 | dropped_frames_ttl); |
1861 | else { | |
1862 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1863 | struct ieee80211_tx_info *info; |
1864 | ||
e32f85f7 LCC |
1865 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1866 | ||
1867 | if (!fwd_skb && net_ratelimit()) | |
1868 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1869 | sdata->name); |
919bbad5 | 1870 | if (!fwd_skb) |
b51aff05 | 1871 | goto out; |
e32f85f7 LCC |
1872 | |
1873 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1874 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1875 | info = IEEE80211_SKB_CB(fwd_skb); |
1876 | memset(info, 0, sizeof(*info)); | |
1877 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1878 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1879 | skb_set_queue_mapping(skb, |
1880 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1881 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1882 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1883 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1884 | fwded_mcast); | |
1885 | else { | |
3c5772a5 JC |
1886 | int err; |
1887 | /* | |
1888 | * Save TA to addr1 to send TA a path error if a | |
1889 | * suitable next hop is not found | |
1890 | */ | |
1891 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1892 | ETH_ALEN); |
3c5772a5 | 1893 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1894 | /* Failed to immediately resolve next hop: |
1895 | * fwded frame was dropped or will be added | |
1896 | * later to the pending skb queue. */ | |
1897 | if (err) | |
1898 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1899 | |
1900 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1901 | fwded_unicast); | |
249b405c JC |
1902 | } |
1903 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1904 | fwded_frames); | |
3b8d81e0 | 1905 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1906 | } |
1907 | } | |
1908 | ||
b51aff05 | 1909 | out: |
3c5772a5 | 1910 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1911 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1912 | return RX_CONTINUE; |
1913 | else | |
1914 | return RX_DROP_MONITOR; | |
1915 | } | |
bf94e17b | 1916 | #endif |
e32f85f7 | 1917 | |
49461622 | 1918 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1919 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1920 | { |
eb9fb5b8 | 1921 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1922 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1923 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1924 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1925 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1926 | int err; |
76ee65bf | 1927 | |
358c8d9d | 1928 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1929 | return RX_CONTINUE; |
76ee65bf | 1930 | |
358c8d9d | 1931 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1932 | return RX_DROP_MONITOR; |
76ee65bf | 1933 | |
f14543ee FF |
1934 | /* |
1935 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1936 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1937 | */ | |
1938 | if (ieee80211_has_a4(hdr->frame_control) && | |
1939 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1940 | return RX_DROP_MONITOR; | |
1941 | ||
e31a16d6 | 1942 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1943 | if (unlikely(err)) |
e4c26add | 1944 | return RX_DROP_UNUSABLE; |
76ee65bf | 1945 | |
358c8d9d | 1946 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1947 | return RX_DROP_MONITOR; |
ce3edf6d | 1948 | |
76ee65bf RR |
1949 | rx->skb->dev = dev; |
1950 | ||
1951 | dev->stats.rx_packets++; | |
1952 | dev->stats.rx_bytes += rx->skb->len; | |
1953 | ||
08ca944e | 1954 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
8c99f691 RM |
1955 | !is_multicast_ether_addr( |
1956 | ((struct ethhdr *)rx->skb->data)->h_dest) && | |
1957 | (!local->scanning && | |
1958 | !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { | |
e15276a4 VN |
1959 | mod_timer(&local->dynamic_ps_timer, jiffies + |
1960 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1961 | } | |
1962 | ||
76ee65bf | 1963 | ieee80211_deliver_skb(rx); |
571ecf67 | 1964 | |
9ae54c84 | 1965 | return RX_QUEUED; |
571ecf67 JB |
1966 | } |
1967 | ||
49461622 | 1968 | static ieee80211_rx_result debug_noinline |
24a8fdad | 1969 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1970 | { |
1971 | struct ieee80211_local *local = rx->local; | |
1972 | struct ieee80211_hw *hw = &local->hw; | |
1973 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1974 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1975 | struct tid_ampdu_rx *tid_agg_rx; |
1976 | u16 start_seq_num; | |
1977 | u16 tid; | |
1978 | ||
a7767f95 | 1979 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1980 | return RX_CONTINUE; |
71364716 | 1981 | |
a7767f95 | 1982 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
1983 | struct { |
1984 | __le16 control, start_seq_num; | |
1985 | } __packed bar_data; | |
1986 | ||
71364716 | 1987 | if (!rx->sta) |
a02ae758 | 1988 | return RX_DROP_MONITOR; |
8ae5977f JB |
1989 | |
1990 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
1991 | &bar_data, sizeof(bar_data))) | |
1992 | return RX_DROP_MONITOR; | |
1993 | ||
8ae5977f | 1994 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
1995 | |
1996 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
1997 | if (!tid_agg_rx) | |
a02ae758 | 1998 | return RX_DROP_MONITOR; |
71364716 | 1999 | |
8ae5977f | 2000 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
2001 | |
2002 | /* reset session timer */ | |
20ad19d0 JB |
2003 | if (tid_agg_rx->timeout) |
2004 | mod_timer(&tid_agg_rx->session_timer, | |
2005 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 2006 | |
dd318575 | 2007 | spin_lock(&tid_agg_rx->reorder_lock); |
a02ae758 | 2008 | /* release stored frames up to start of BAR */ |
24a8fdad | 2009 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); |
dd318575 JB |
2010 | spin_unlock(&tid_agg_rx->reorder_lock); |
2011 | ||
a02ae758 JB |
2012 | kfree_skb(skb); |
2013 | return RX_QUEUED; | |
71364716 RR |
2014 | } |
2015 | ||
08daecae JB |
2016 | /* |
2017 | * After this point, we only want management frames, | |
2018 | * so we can drop all remaining control frames to | |
2019 | * cooked monitor interfaces. | |
2020 | */ | |
2021 | return RX_DROP_MONITOR; | |
71364716 RR |
2022 | } |
2023 | ||
f4f727a6 JM |
2024 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
2025 | struct ieee80211_mgmt *mgmt, | |
2026 | size_t len) | |
fea14732 JM |
2027 | { |
2028 | struct ieee80211_local *local = sdata->local; | |
2029 | struct sk_buff *skb; | |
2030 | struct ieee80211_mgmt *resp; | |
2031 | ||
47846c9b | 2032 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
2033 | /* Not to own unicast address */ |
2034 | return; | |
2035 | } | |
2036 | ||
46900298 JB |
2037 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
2038 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 2039 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
2040 | return; |
2041 | } | |
2042 | ||
2043 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2044 | /* Too short SA Query request frame */ | |
2045 | return; | |
2046 | } | |
2047 | ||
2048 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2049 | if (skb == NULL) | |
2050 | return; | |
2051 | ||
2052 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2053 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2054 | memset(resp, 0, 24); | |
2055 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 2056 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 2057 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
2058 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2059 | IEEE80211_STYPE_ACTION); | |
2060 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2061 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2062 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2063 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2064 | mgmt->u.action.u.sa_query.trans_id, | |
2065 | WLAN_SA_QUERY_TR_ID_LEN); | |
2066 | ||
62ae67be | 2067 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
2068 | } |
2069 | ||
2e161f78 JB |
2070 | static ieee80211_rx_result debug_noinline |
2071 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2072 | { | |
2073 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
554891e6 | 2074 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2075 | |
2076 | /* | |
2077 | * From here on, look only at management frames. | |
2078 | * Data and control frames are already handled, | |
2079 | * and unknown (reserved) frames are useless. | |
2080 | */ | |
2081 | if (rx->skb->len < 24) | |
2082 | return RX_DROP_MONITOR; | |
2083 | ||
2084 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2085 | return RX_DROP_MONITOR; | |
2086 | ||
554891e6 | 2087 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
2e161f78 JB |
2088 | return RX_DROP_MONITOR; |
2089 | ||
2090 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2091 | return RX_DROP_UNUSABLE; | |
2092 | ||
2093 | return RX_CONTINUE; | |
2094 | } | |
2095 | ||
de1ede7a JB |
2096 | static ieee80211_rx_result debug_noinline |
2097 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2098 | { | |
2099 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 2100 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 2101 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
554891e6 | 2102 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
de1ede7a JB |
2103 | int len = rx->skb->len; |
2104 | ||
2105 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2106 | return RX_CONTINUE; | |
2107 | ||
026331c4 JM |
2108 | /* drop too small frames */ |
2109 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 2110 | return RX_DROP_UNUSABLE; |
de1ede7a | 2111 | |
026331c4 | 2112 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 2113 | return RX_DROP_UNUSABLE; |
de1ede7a | 2114 | |
554891e6 | 2115 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 2116 | return RX_DROP_UNUSABLE; |
97ebe12a | 2117 | |
de1ede7a JB |
2118 | switch (mgmt->u.action.category) { |
2119 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
2120 | /* |
2121 | * The aggregation code is not prepared to handle | |
2122 | * anything but STA/AP due to the BSSID handling; | |
2123 | * IBSS could work in the code but isn't supported | |
2124 | * by drivers or the standard. | |
2125 | */ | |
2126 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2127 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2128 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 2129 | break; |
8abd3f9b | 2130 | |
026331c4 JM |
2131 | /* verify action_code is present */ |
2132 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2133 | break; | |
2134 | ||
de1ede7a JB |
2135 | switch (mgmt->u.action.u.addba_req.action_code) { |
2136 | case WLAN_ACTION_ADDBA_REQ: | |
2137 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2138 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
2139 | goto invalid; |
2140 | break; | |
de1ede7a JB |
2141 | case WLAN_ACTION_ADDBA_RESP: |
2142 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2143 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
2144 | goto invalid; |
2145 | break; | |
de1ede7a JB |
2146 | case WLAN_ACTION_DELBA: |
2147 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2148 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
2149 | goto invalid; |
2150 | break; | |
2151 | default: | |
2152 | goto invalid; | |
de1ede7a | 2153 | } |
bed7ee6e | 2154 | |
8b58ff83 | 2155 | goto queue; |
39192c0b JB |
2156 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2157 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2158 | break; |
46900298 JB |
2159 | |
2160 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2161 | break; |
46900298 | 2162 | |
026331c4 JM |
2163 | /* verify action_code is present */ |
2164 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2165 | break; | |
2166 | ||
39192c0b JB |
2167 | switch (mgmt->u.action.u.measurement.action_code) { |
2168 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2169 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2170 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2171 | break; |
39192c0b | 2172 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2173 | goto handled; |
c481ec97 S |
2174 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2175 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2176 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2177 | break; |
c481ec97 | 2178 | |
cc32abd4 | 2179 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2180 | break; |
cc32abd4 | 2181 | |
46900298 | 2182 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2183 | break; |
c481ec97 | 2184 | |
8b58ff83 | 2185 | goto queue; |
39192c0b JB |
2186 | } |
2187 | break; | |
fea14732 JM |
2188 | case WLAN_CATEGORY_SA_QUERY: |
2189 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2190 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2191 | break; |
2192 | ||
fea14732 JM |
2193 | switch (mgmt->u.action.u.sa_query.action) { |
2194 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2195 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2196 | break; |
fea14732 | 2197 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2198 | goto handled; |
fea14732 JM |
2199 | } |
2200 | break; | |
97ad9139 | 2201 | case WLAN_CATEGORY_MESH_PLINK: |
77a121c3 JB |
2202 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2203 | break; | |
8b58ff83 | 2204 | goto queue; |
c7108a71 JC |
2205 | case WLAN_CATEGORY_MESH_PATH_SEL: |
2206 | if (!mesh_path_sel_is_hwmp(sdata)) | |
2207 | break; | |
2208 | goto queue; | |
84040805 | 2209 | } |
026331c4 | 2210 | |
2e161f78 JB |
2211 | return RX_CONTINUE; |
2212 | ||
bed7ee6e | 2213 | invalid: |
554891e6 | 2214 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
2e161f78 JB |
2215 | /* will return in the next handlers */ |
2216 | return RX_CONTINUE; | |
2217 | ||
2218 | handled: | |
2219 | if (rx->sta) | |
2220 | rx->sta->rx_packets++; | |
2221 | dev_kfree_skb(rx->skb); | |
2222 | return RX_QUEUED; | |
2223 | ||
2224 | queue: | |
2225 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2226 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2227 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2228 | if (rx->sta) | |
2229 | rx->sta->rx_packets++; | |
2230 | return RX_QUEUED; | |
2231 | } | |
2232 | ||
2233 | static ieee80211_rx_result debug_noinline | |
2234 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2235 | { | |
554891e6 | 2236 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2237 | |
2238 | /* skip known-bad action frames and return them in the next handler */ | |
554891e6 | 2239 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
2e161f78 | 2240 | return RX_CONTINUE; |
d7907448 | 2241 | |
026331c4 JM |
2242 | /* |
2243 | * Getting here means the kernel doesn't know how to handle | |
2244 | * it, but maybe userspace does ... include returned frames | |
2245 | * so userspace can register for those to know whether ones | |
2246 | * it transmitted were processed or returned. | |
2247 | */ | |
026331c4 | 2248 | |
2e161f78 JB |
2249 | if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, |
2250 | rx->skb->data, rx->skb->len, | |
2251 | GFP_ATOMIC)) { | |
2252 | if (rx->sta) | |
2253 | rx->sta->rx_packets++; | |
2254 | dev_kfree_skb(rx->skb); | |
2255 | return RX_QUEUED; | |
2256 | } | |
2257 | ||
2258 | ||
2259 | return RX_CONTINUE; | |
2260 | } | |
2261 | ||
2262 | static ieee80211_rx_result debug_noinline | |
2263 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2264 | { | |
2265 | struct ieee80211_local *local = rx->local; | |
2266 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2267 | struct sk_buff *nskb; | |
2268 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
554891e6 | 2269 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2270 | |
2271 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2272 | return RX_CONTINUE; | |
2273 | ||
2274 | /* | |
2275 | * For AP mode, hostapd is responsible for handling any action | |
2276 | * frames that we didn't handle, including returning unknown | |
2277 | * ones. For all other modes we will return them to the sender, | |
2278 | * setting the 0x80 bit in the action category, as required by | |
2279 | * 802.11-2007 7.3.1.11. | |
2280 | * Newer versions of hostapd shall also use the management frame | |
2281 | * registration mechanisms, but older ones still use cooked | |
2282 | * monitor interfaces so push all frames there. | |
2283 | */ | |
554891e6 | 2284 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
2e161f78 JB |
2285 | (sdata->vif.type == NL80211_IFTYPE_AP || |
2286 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2287 | return RX_DROP_MONITOR; | |
026331c4 | 2288 | |
84040805 JB |
2289 | /* do not return rejected action frames */ |
2290 | if (mgmt->u.action.category & 0x80) | |
2291 | return RX_DROP_UNUSABLE; | |
2292 | ||
2293 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2294 | GFP_ATOMIC); | |
2295 | if (nskb) { | |
292b4df6 | 2296 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2297 | |
292b4df6 JL |
2298 | nmgmt->u.action.category |= 0x80; |
2299 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2300 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2301 | |
2302 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2303 | ||
2304 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a | 2305 | } |
39192c0b JB |
2306 | dev_kfree_skb(rx->skb); |
2307 | return RX_QUEUED; | |
de1ede7a JB |
2308 | } |
2309 | ||
49461622 | 2310 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2311 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2312 | { |
eb9fb5b8 | 2313 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2314 | ieee80211_rx_result rxs; |
77a121c3 JB |
2315 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2316 | __le16 stype; | |
571ecf67 | 2317 | |
af6b6374 JB |
2318 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2319 | if (rxs != RX_CONTINUE) | |
2320 | return rxs; | |
2321 | ||
77a121c3 | 2322 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2323 | |
77a121c3 JB |
2324 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2325 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2326 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2327 | return RX_DROP_MONITOR; | |
472dbc45 | 2328 | |
77a121c3 JB |
2329 | switch (stype) { |
2330 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2331 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2332 | /* process for all: mesh, mlme, ibss */ | |
2333 | break; | |
2334 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2335 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2c31333a CL |
2336 | if (is_multicast_ether_addr(mgmt->da) && |
2337 | !is_broadcast_ether_addr(mgmt->da)) | |
2338 | return RX_DROP_MONITOR; | |
2339 | ||
77a121c3 JB |
2340 | /* process only for station */ |
2341 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2342 | return RX_DROP_MONITOR; | |
2343 | break; | |
2344 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2345 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2346 | /* process only for ibss */ | |
2347 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2348 | return RX_DROP_MONITOR; | |
2349 | break; | |
2350 | default: | |
2351 | return RX_DROP_MONITOR; | |
2352 | } | |
f9d540ee | 2353 | |
77a121c3 | 2354 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2355 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2356 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2357 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2358 | if (rx->sta) |
2359 | rx->sta->rx_packets++; | |
46900298 | 2360 | |
77a121c3 | 2361 | return RX_QUEUED; |
571ecf67 JB |
2362 | } |
2363 | ||
3b8d81e0 | 2364 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2365 | struct ieee80211_rx_data *rx) |
571ecf67 | 2366 | { |
a7767f95 HH |
2367 | int keyidx; |
2368 | unsigned int hdrlen; | |
571ecf67 | 2369 | |
a7767f95 | 2370 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2371 | if (rx->skb->len >= hdrlen + 4) |
2372 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2373 | else | |
2374 | keyidx = -1; | |
2375 | ||
8944b79f | 2376 | if (!rx->sta) { |
aa0daf0e JB |
2377 | /* |
2378 | * Some hardware seem to generate incorrect Michael MIC | |
2379 | * reports; ignore them to avoid triggering countermeasures. | |
2380 | */ | |
af2ced6a | 2381 | return; |
571ecf67 JB |
2382 | } |
2383 | ||
a7767f95 | 2384 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2385 | return; |
571ecf67 | 2386 | |
05c914fe | 2387 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2388 | /* |
2389 | * APs with pairwise keys should never receive Michael MIC | |
2390 | * errors for non-zero keyidx because these are reserved for | |
2391 | * group keys and only the AP is sending real multicast | |
2392 | * frames in the BSS. | |
2393 | */ | |
af2ced6a | 2394 | return; |
571ecf67 JB |
2395 | } |
2396 | ||
a7767f95 HH |
2397 | if (!ieee80211_is_data(hdr->frame_control) && |
2398 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2399 | return; |
571ecf67 | 2400 | |
e6d6e342 JB |
2401 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2402 | GFP_ATOMIC); | |
571ecf67 JB |
2403 | } |
2404 | ||
5cf121c3 | 2405 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2406 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2407 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2408 | { |
2409 | struct ieee80211_sub_if_data *sdata; | |
2410 | struct ieee80211_local *local = rx->local; | |
2411 | struct ieee80211_rtap_hdr { | |
2412 | struct ieee80211_radiotap_header hdr; | |
2413 | u8 flags; | |
5f0b7de5 | 2414 | u8 rate_or_pad; |
3d30d949 MW |
2415 | __le16 chan_freq; |
2416 | __le16 chan_flags; | |
bc10502d | 2417 | } __packed *rthdr; |
3d30d949 MW |
2418 | struct sk_buff *skb = rx->skb, *skb2; |
2419 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2420 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2421 | |
554891e6 JB |
2422 | /* |
2423 | * If cooked monitor has been processed already, then | |
2424 | * don't do it again. If not, set the flag. | |
2425 | */ | |
2426 | if (rx->flags & IEEE80211_RX_CMNTR) | |
7c1e1831 | 2427 | goto out_free_skb; |
554891e6 | 2428 | rx->flags |= IEEE80211_RX_CMNTR; |
7c1e1831 | 2429 | |
3d30d949 MW |
2430 | if (skb_headroom(skb) < sizeof(*rthdr) && |
2431 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2432 | goto out_free_skb; | |
2433 | ||
2434 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2435 | memset(rthdr, 0, sizeof(*rthdr)); | |
2436 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2437 | rthdr->hdr.it_present = | |
2438 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2439 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2440 | ||
5f0b7de5 JB |
2441 | if (rate) { |
2442 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2443 | rthdr->hdr.it_present |= | |
2444 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2445 | } | |
3d30d949 MW |
2446 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2447 | ||
2448 | if (status->band == IEEE80211_BAND_5GHZ) | |
2449 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2450 | IEEE80211_CHAN_5GHZ); | |
2451 | else | |
2452 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2453 | IEEE80211_CHAN_2GHZ); | |
2454 | ||
2455 | skb_set_mac_header(skb, 0); | |
2456 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2457 | skb->pkt_type = PACKET_OTHERHOST; | |
2458 | skb->protocol = htons(ETH_P_802_2); | |
2459 | ||
2460 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2461 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2462 | continue; |
2463 | ||
05c914fe | 2464 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2465 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2466 | continue; | |
2467 | ||
2468 | if (prev_dev) { | |
2469 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2470 | if (skb2) { | |
2471 | skb2->dev = prev_dev; | |
5548a8a1 | 2472 | netif_receive_skb(skb2); |
3d30d949 MW |
2473 | } |
2474 | } | |
2475 | ||
2476 | prev_dev = sdata->dev; | |
2477 | sdata->dev->stats.rx_packets++; | |
2478 | sdata->dev->stats.rx_bytes += skb->len; | |
2479 | } | |
2480 | ||
2481 | if (prev_dev) { | |
2482 | skb->dev = prev_dev; | |
5548a8a1 | 2483 | netif_receive_skb(skb); |
554891e6 JB |
2484 | return; |
2485 | } | |
3d30d949 MW |
2486 | |
2487 | out_free_skb: | |
2488 | dev_kfree_skb(skb); | |
2489 | } | |
2490 | ||
aa0c8636 CL |
2491 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2492 | ieee80211_rx_result res) | |
2493 | { | |
2494 | switch (res) { | |
2495 | case RX_DROP_MONITOR: | |
2496 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2497 | if (rx->sta) | |
2498 | rx->sta->rx_dropped++; | |
2499 | /* fall through */ | |
2500 | case RX_CONTINUE: { | |
2501 | struct ieee80211_rate *rate = NULL; | |
2502 | struct ieee80211_supported_band *sband; | |
2503 | struct ieee80211_rx_status *status; | |
2504 | ||
2505 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2506 | ||
2507 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2508 | if (!(status->flag & RX_FLAG_HT)) | |
2509 | rate = &sband->bitrates[status->rate_idx]; | |
2510 | ||
2511 | ieee80211_rx_cooked_monitor(rx, rate); | |
2512 | break; | |
2513 | } | |
2514 | case RX_DROP_UNUSABLE: | |
2515 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2516 | if (rx->sta) | |
2517 | rx->sta->rx_dropped++; | |
2518 | dev_kfree_skb(rx->skb); | |
2519 | break; | |
2520 | case RX_QUEUED: | |
2521 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2522 | break; | |
2523 | } | |
2524 | } | |
571ecf67 | 2525 | |
24a8fdad | 2526 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) |
58905290 | 2527 | { |
58905290 | 2528 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2529 | struct sk_buff *skb; |
8944b79f | 2530 | |
e32f85f7 LCC |
2531 | #define CALL_RXH(rxh) \ |
2532 | do { \ | |
2533 | res = rxh(rx); \ | |
2534 | if (res != RX_CONTINUE) \ | |
2569a826 | 2535 | goto rxh_next; \ |
e32f85f7 | 2536 | } while (0); |
49461622 | 2537 | |
24a8fdad CL |
2538 | spin_lock(&rx->local->rx_skb_queue.lock); |
2539 | if (rx->local->running_rx_handler) | |
2540 | goto unlock; | |
2541 | ||
2542 | rx->local->running_rx_handler = true; | |
2543 | ||
2544 | while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { | |
2545 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2546 | ||
2569a826 JB |
2547 | /* |
2548 | * all the other fields are valid across frames | |
2549 | * that belong to an aMPDU since they are on the | |
2550 | * same TID from the same station | |
2551 | */ | |
2552 | rx->skb = skb; | |
554891e6 | 2553 | rx->flags = 0; |
2569a826 JB |
2554 | |
2555 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2556 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2557 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2558 | CALL_RXH(ieee80211_rx_h_defragment) | |
2559 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2560 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2561 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2562 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2563 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2564 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2565 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2566 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2567 | #endif |
2569a826 | 2568 | CALL_RXH(ieee80211_rx_h_data) |
24a8fdad | 2569 | CALL_RXH(ieee80211_rx_h_ctrl); |
2e161f78 | 2570 | CALL_RXH(ieee80211_rx_h_mgmt_check) |
2569a826 | 2571 | CALL_RXH(ieee80211_rx_h_action) |
2e161f78 JB |
2572 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) |
2573 | CALL_RXH(ieee80211_rx_h_action_return) | |
2569a826 | 2574 | CALL_RXH(ieee80211_rx_h_mgmt) |
49461622 | 2575 | |
aa0c8636 CL |
2576 | rxh_next: |
2577 | ieee80211_rx_handlers_result(rx, res); | |
24a8fdad | 2578 | spin_lock(&rx->local->rx_skb_queue.lock); |
49461622 | 2579 | #undef CALL_RXH |
aa0c8636 | 2580 | } |
24a8fdad CL |
2581 | |
2582 | rx->local->running_rx_handler = false; | |
2583 | ||
2584 | unlock: | |
2585 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
aa0c8636 CL |
2586 | } |
2587 | ||
4406c376 | 2588 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
aa0c8636 | 2589 | { |
aa0c8636 CL |
2590 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2591 | ||
aa0c8636 CL |
2592 | #define CALL_RXH(rxh) \ |
2593 | do { \ | |
2594 | res = rxh(rx); \ | |
2595 | if (res != RX_CONTINUE) \ | |
2596 | goto rxh_next; \ | |
2597 | } while (0); | |
2598 | ||
2599 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2600 | CALL_RXH(ieee80211_rx_h_check) | |
2601 | ||
24a8fdad | 2602 | ieee80211_rx_reorder_ampdu(rx); |
aa0c8636 | 2603 | |
24a8fdad | 2604 | ieee80211_rx_handlers(rx); |
aa0c8636 | 2605 | return; |
49461622 | 2606 | |
2569a826 | 2607 | rxh_next: |
aa0c8636 CL |
2608 | ieee80211_rx_handlers_result(rx, res); |
2609 | ||
2610 | #undef CALL_RXH | |
58905290 JB |
2611 | } |
2612 | ||
2bff8ebf | 2613 | /* |
dd318575 JB |
2614 | * This function makes calls into the RX path, therefore |
2615 | * it has to be invoked under RCU read lock. | |
2bff8ebf CL |
2616 | */ |
2617 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2618 | { | |
554891e6 JB |
2619 | struct ieee80211_rx_data rx = { |
2620 | .sta = sta, | |
2621 | .sdata = sta->sdata, | |
2622 | .local = sta->local, | |
2623 | .queue = tid, | |
2624 | }; | |
2c15a0cf CL |
2625 | struct tid_ampdu_rx *tid_agg_rx; |
2626 | ||
2627 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2628 | if (!tid_agg_rx) | |
2629 | return; | |
2bff8ebf | 2630 | |
2c15a0cf | 2631 | spin_lock(&tid_agg_rx->reorder_lock); |
24a8fdad | 2632 | ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); |
2c15a0cf | 2633 | spin_unlock(&tid_agg_rx->reorder_lock); |
2bff8ebf | 2634 | |
24a8fdad | 2635 | ieee80211_rx_handlers(&rx); |
2bff8ebf CL |
2636 | } |
2637 | ||
571ecf67 JB |
2638 | /* main receive path */ |
2639 | ||
20b01f80 | 2640 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
23a24def JB |
2641 | struct ieee80211_hdr *hdr) |
2642 | { | |
20b01f80 | 2643 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
eb9fb5b8 JB |
2644 | struct sk_buff *skb = rx->skb; |
2645 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2646 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2647 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2648 | ||
51fb61e7 | 2649 | switch (sdata->vif.type) { |
05c914fe | 2650 | case NL80211_IFTYPE_STATION: |
9bc383de | 2651 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2652 | return 0; |
77fdaa12 | 2653 | if (!multicast && |
47846c9b | 2654 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2655 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2656 | return 0; |
554891e6 | 2657 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2658 | } |
2659 | break; | |
05c914fe | 2660 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2661 | if (!bssid) |
2662 | return 0; | |
a7767f95 | 2663 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2664 | return 1; |
87291c02 | 2665 | } |
46900298 | 2666 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
554891e6 | 2667 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2668 | return 0; |
554891e6 | 2669 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2670 | } else if (!multicast && |
47846c9b | 2671 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2672 | hdr->addr1) != 0) { |
4150c572 | 2673 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2674 | return 0; |
554891e6 | 2675 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2676 | } else if (!rx->sta) { |
2677 | int rate_idx; | |
eb9fb5b8 | 2678 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2679 | rate_idx = 0; /* TODO: HT rates */ |
2680 | else | |
eb9fb5b8 | 2681 | rate_idx = status->rate_idx; |
34e89507 JB |
2682 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2683 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2684 | } |
23a24def | 2685 | break; |
05c914fe | 2686 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2687 | if (!multicast && |
47846c9b | 2688 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2689 | hdr->addr1) != 0) { |
2690 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2691 | return 0; | |
2692 | ||
554891e6 | 2693 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2694 | } |
2695 | break; | |
05c914fe JB |
2696 | case NL80211_IFTYPE_AP_VLAN: |
2697 | case NL80211_IFTYPE_AP: | |
23a24def | 2698 | if (!bssid) { |
47846c9b | 2699 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2700 | hdr->addr1)) |
2701 | return 0; | |
2702 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2703 | sdata->vif.addr)) { |
771bbd09 AN |
2704 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && |
2705 | !ieee80211_is_beacon(hdr->frame_control)) | |
23a24def | 2706 | return 0; |
554891e6 | 2707 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2708 | } |
23a24def | 2709 | break; |
05c914fe | 2710 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2711 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2712 | return 0; |
2713 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2714 | return 0; | |
2715 | break; | |
2ca27bcf | 2716 | default: |
fb1c1cd6 JB |
2717 | /* should never get here */ |
2718 | WARN_ON(1); | |
2719 | break; | |
23a24def JB |
2720 | } |
2721 | ||
2722 | return 1; | |
2723 | } | |
2724 | ||
4406c376 JB |
2725 | /* |
2726 | * This function returns whether or not the SKB | |
2727 | * was destined for RX processing or not, which, | |
2728 | * if consume is true, is equivalent to whether | |
2729 | * or not the skb was consumed. | |
2730 | */ | |
2731 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2732 | struct sk_buff *skb, bool consume) | |
2733 | { | |
2734 | struct ieee80211_local *local = rx->local; | |
2735 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2736 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2737 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2738 | int prepares; | |
2739 | ||
2740 | rx->skb = skb; | |
554891e6 | 2741 | status->rx_flags |= IEEE80211_RX_RA_MATCH; |
4406c376 JB |
2742 | prepares = prepare_for_handlers(rx, hdr); |
2743 | ||
2744 | if (!prepares) | |
2745 | return false; | |
2746 | ||
2747 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
554891e6 | 2748 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) |
4406c376 JB |
2749 | ieee80211_rx_michael_mic_report(hdr, rx); |
2750 | return false; | |
2751 | } | |
2752 | ||
2753 | if (!consume) { | |
2754 | skb = skb_copy(skb, GFP_ATOMIC); | |
2755 | if (!skb) { | |
2756 | if (net_ratelimit()) | |
2757 | wiphy_debug(local->hw.wiphy, | |
b305dae4 | 2758 | "failed to copy skb for %s\n", |
4406c376 JB |
2759 | sdata->name); |
2760 | return true; | |
2761 | } | |
2762 | ||
2763 | rx->skb = skb; | |
2764 | } | |
2765 | ||
2766 | ieee80211_invoke_rx_handlers(rx); | |
2767 | return true; | |
2768 | } | |
2769 | ||
571ecf67 | 2770 | /* |
6368e4b1 RR |
2771 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2772 | * be called with rcu_read_lock protection. | |
571ecf67 | 2773 | */ |
71ebb4aa | 2774 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2775 | struct sk_buff *skb) |
571ecf67 | 2776 | { |
554891e6 | 2777 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2778 | struct ieee80211_local *local = hw_to_local(hw); |
2779 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2780 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2781 | __le16 fc; |
5cf121c3 | 2782 | struct ieee80211_rx_data rx; |
4406c376 | 2783 | struct ieee80211_sub_if_data *prev; |
56af3268 | 2784 | struct sta_info *sta, *tmp, *prev_sta; |
e3cf8b3f | 2785 | int err = 0; |
571ecf67 | 2786 | |
e3cf8b3f | 2787 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2788 | memset(&rx, 0, sizeof(rx)); |
2789 | rx.skb = skb; | |
2790 | rx.local = local; | |
72abd81b | 2791 | |
e3cf8b3f | 2792 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2793 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2794 | |
142b9f50 HS |
2795 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2796 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
554891e6 | 2797 | status->rx_flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2798 | |
e3cf8b3f ZY |
2799 | if (ieee80211_is_mgmt(fc)) |
2800 | err = skb_linearize(skb); | |
2801 | else | |
2802 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2803 | ||
2804 | if (err) { | |
2805 | dev_kfree_skb(skb); | |
2806 | return; | |
2807 | } | |
2808 | ||
2809 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2810 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2811 | ieee80211_verify_alignment(&rx); |
38f3714d | 2812 | |
e3cf8b3f | 2813 | if (ieee80211_is_data(fc)) { |
56af3268 | 2814 | prev_sta = NULL; |
4406c376 | 2815 | |
abe60632 | 2816 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
56af3268 BG |
2817 | if (!prev_sta) { |
2818 | prev_sta = sta; | |
2819 | continue; | |
2820 | } | |
2821 | ||
2822 | rx.sta = prev_sta; | |
2823 | rx.sdata = prev_sta->sdata; | |
4406c376 | 2824 | ieee80211_prepare_and_rx_handle(&rx, skb, false); |
abe60632 | 2825 | |
56af3268 | 2826 | prev_sta = sta; |
4406c376 | 2827 | } |
56af3268 BG |
2828 | |
2829 | if (prev_sta) { | |
2830 | rx.sta = prev_sta; | |
2831 | rx.sdata = prev_sta->sdata; | |
2832 | ||
4406c376 | 2833 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
56af3268 | 2834 | return; |
8e26d5ad | 2835 | goto out; |
56af3268 | 2836 | } |
4406c376 JB |
2837 | } |
2838 | ||
4b0dd98e | 2839 | prev = NULL; |
b2e7771e | 2840 | |
4b0dd98e JB |
2841 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2842 | if (!ieee80211_sdata_running(sdata)) | |
2843 | continue; | |
340e11f3 | 2844 | |
4b0dd98e JB |
2845 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2846 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2847 | continue; | |
340e11f3 | 2848 | |
4b0dd98e JB |
2849 | /* |
2850 | * frame is destined for this interface, but if it's | |
2851 | * not also for the previous one we handle that after | |
2852 | * the loop to avoid copying the SKB once too much | |
2853 | */ | |
4bb29f8c | 2854 | |
4b0dd98e | 2855 | if (!prev) { |
abe60632 | 2856 | prev = sdata; |
4b0dd98e | 2857 | continue; |
340e11f3 | 2858 | } |
4bb29f8c | 2859 | |
4b0dd98e JB |
2860 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
2861 | rx.sdata = prev; | |
2862 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
4bb29f8c | 2863 | |
4b0dd98e JB |
2864 | prev = sdata; |
2865 | } | |
2866 | ||
2867 | if (prev) { | |
2868 | rx.sta = sta_info_get_bss(prev, hdr->addr2); | |
2869 | rx.sdata = prev; | |
4406c376 | 2870 | |
4b0dd98e JB |
2871 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
2872 | return; | |
571ecf67 | 2873 | } |
4406c376 | 2874 | |
8e26d5ad | 2875 | out: |
4406c376 | 2876 | dev_kfree_skb(skb); |
571ecf67 | 2877 | } |
6368e4b1 RR |
2878 | |
2879 | /* | |
2880 | * This is the receive path handler. It is called by a low level driver when an | |
2881 | * 802.11 MPDU is received from the hardware. | |
2882 | */ | |
103bf9f7 | 2883 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2884 | { |
2885 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2886 | struct ieee80211_rate *rate = NULL; |
2887 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2888 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2889 | |
d20ef63d JB |
2890 | WARN_ON_ONCE(softirq_count() == 0); |
2891 | ||
77a980dc JB |
2892 | if (WARN_ON(status->band < 0 || |
2893 | status->band >= IEEE80211_NUM_BANDS)) | |
2894 | goto drop; | |
8318d78a JB |
2895 | |
2896 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2897 | if (WARN_ON(!sband)) |
2898 | goto drop; | |
8318d78a | 2899 | |
89c3a8ac JB |
2900 | /* |
2901 | * If we're suspending, it is possible although not too likely | |
2902 | * that we'd be receiving frames after having already partially | |
2903 | * quiesced the stack. We can't process such frames then since | |
2904 | * that might, for example, cause stations to be added or other | |
2905 | * driver callbacks be invoked. | |
2906 | */ | |
77a980dc JB |
2907 | if (unlikely(local->quiescing || local->suspended)) |
2908 | goto drop; | |
89c3a8ac | 2909 | |
ea77f12f JB |
2910 | /* |
2911 | * The same happens when we're not even started, | |
2912 | * but that's worth a warning. | |
2913 | */ | |
77a980dc JB |
2914 | if (WARN_ON(!local->started)) |
2915 | goto drop; | |
ea77f12f | 2916 | |
fc885189 | 2917 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 2918 | /* |
fc885189 JB |
2919 | * Validate the rate, unless a PLCP error means that |
2920 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 2921 | */ |
fc885189 JB |
2922 | |
2923 | if (status->flag & RX_FLAG_HT) { | |
2924 | /* | |
2925 | * rate_idx is MCS index, which can be [0-76] | |
2926 | * as documented on: | |
2927 | * | |
2928 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2929 | * | |
2930 | * Anything else would be some sort of driver or | |
2931 | * hardware error. The driver should catch hardware | |
2932 | * errors. | |
2933 | */ | |
2934 | if (WARN((status->rate_idx < 0 || | |
2935 | status->rate_idx > 76), | |
2936 | "Rate marked as an HT rate but passed " | |
2937 | "status->rate_idx is not " | |
2938 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2939 | status->rate_idx, | |
2940 | status->rate_idx)) | |
2941 | goto drop; | |
2942 | } else { | |
2943 | if (WARN_ON(status->rate_idx < 0 || | |
2944 | status->rate_idx >= sband->n_bitrates)) | |
2945 | goto drop; | |
2946 | rate = &sband->bitrates[status->rate_idx]; | |
2947 | } | |
0fb8ca45 | 2948 | } |
6368e4b1 | 2949 | |
554891e6 JB |
2950 | status->rx_flags = 0; |
2951 | ||
6368e4b1 RR |
2952 | /* |
2953 | * key references and virtual interfaces are protected using RCU | |
2954 | * and this requires that we are in a read-side RCU section during | |
2955 | * receive processing | |
2956 | */ | |
2957 | rcu_read_lock(); | |
2958 | ||
2959 | /* | |
2960 | * Frames with failed FCS/PLCP checksum are not returned, | |
2961 | * all other frames are returned without radiotap header | |
2962 | * if it was previously present. | |
2963 | * Also, frames with less than 16 bytes are dropped. | |
2964 | */ | |
f1d58c25 | 2965 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2966 | if (!skb) { |
2967 | rcu_read_unlock(); | |
2968 | return; | |
2969 | } | |
2970 | ||
e1e54068 JB |
2971 | ieee80211_tpt_led_trig_rx(local, |
2972 | ((struct ieee80211_hdr *)skb->data)->frame_control, | |
2973 | skb->len); | |
071d9ac2 | 2974 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
2975 | |
2976 | rcu_read_unlock(); | |
77a980dc JB |
2977 | |
2978 | return; | |
2979 | drop: | |
2980 | kfree_skb(skb); | |
6368e4b1 | 2981 | } |
103bf9f7 | 2982 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2983 | |
2984 | /* This is a version of the rx handler that can be called from hard irq | |
2985 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2986 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2987 | { |
2988 | struct ieee80211_local *local = hw_to_local(hw); | |
2989 | ||
2990 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2991 | ||
571ecf67 JB |
2992 | skb->pkt_type = IEEE80211_RX_MSG; |
2993 | skb_queue_tail(&local->skb_queue, skb); | |
2994 | tasklet_schedule(&local->tasklet); | |
2995 | } | |
2996 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |