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Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
84040805 | 5 | * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> |
571ecf67 JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
571ecf67 JB |
14 | #include <linux/kernel.h> |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/etherdevice.h> | |
d4e46a3d | 18 | #include <linux/rcupdate.h> |
571ecf67 JB |
19 | #include <net/mac80211.h> |
20 | #include <net/ieee80211_radiotap.h> | |
21 | ||
22 | #include "ieee80211_i.h" | |
24487981 | 23 | #include "driver-ops.h" |
2c8dccc7 | 24 | #include "led.h" |
33b64eb2 | 25 | #include "mesh.h" |
571ecf67 JB |
26 | #include "wep.h" |
27 | #include "wpa.h" | |
28 | #include "tkip.h" | |
29 | #include "wme.h" | |
30 | ||
b2e7771e JB |
31 | /* |
32 | * monitor mode reception | |
33 | * | |
34 | * This function cleans up the SKB, i.e. it removes all the stuff | |
35 | * only useful for monitoring. | |
36 | */ | |
37 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 38 | struct sk_buff *skb) |
b2e7771e | 39 | { |
b2e7771e JB |
40 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
41 | if (likely(skb->len > FCS_LEN)) | |
e3cf8b3f | 42 | __pskb_trim(skb, skb->len - FCS_LEN); |
b2e7771e JB |
43 | else { |
44 | /* driver bug */ | |
45 | WARN_ON(1); | |
46 | dev_kfree_skb(skb); | |
47 | skb = NULL; | |
48 | } | |
49 | } | |
50 | ||
51 | return skb; | |
52 | } | |
53 | ||
f1d58c25 | 54 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 55 | int present_fcs_len) |
b2e7771e | 56 | { |
f1d58c25 | 57 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 58 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
59 | |
60 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
61 | return 1; | |
0869aea0 | 62 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 63 | return 1; |
87228f57 HH |
64 | if (ieee80211_is_ctl(hdr->frame_control) && |
65 | !ieee80211_is_pspoll(hdr->frame_control) && | |
66 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
67 | return 1; |
68 | return 0; | |
69 | } | |
70 | ||
601ae7f2 BR |
71 | static int |
72 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
73 | struct ieee80211_rx_status *status) | |
74 | { | |
75 | int len; | |
76 | ||
77 | /* always present fields */ | |
78 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
79 | ||
80 | if (status->flag & RX_FLAG_TSFT) | |
81 | len += 8; | |
7fee5372 | 82 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 | 83 | len += 1; |
601ae7f2 BR |
84 | |
85 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
86 | len++; | |
87 | ||
601ae7f2 BR |
88 | return len; |
89 | } | |
90 | ||
d1c3a37c | 91 | /* |
601ae7f2 BR |
92 | * ieee80211_add_rx_radiotap_header - add radiotap header |
93 | * | |
94 | * add a radiotap header containing all the fields which the hardware provided. | |
95 | */ | |
96 | static void | |
97 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
98 | struct sk_buff *skb, | |
601ae7f2 BR |
99 | struct ieee80211_rate *rate, |
100 | int rtap_len) | |
101 | { | |
f1d58c25 | 102 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
103 | struct ieee80211_radiotap_header *rthdr; |
104 | unsigned char *pos; | |
6a86b9c7 | 105 | u16 rx_flags = 0; |
601ae7f2 BR |
106 | |
107 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
108 | memset(rthdr, 0, rtap_len); | |
109 | ||
110 | /* radiotap header, set always present flags */ | |
111 | rthdr->it_present = | |
112 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
113 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
114 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
115 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
116 | rthdr->it_len = cpu_to_le16(rtap_len); | |
117 | ||
118 | pos = (unsigned char *)(rthdr+1); | |
119 | ||
120 | /* the order of the following fields is important */ | |
121 | ||
122 | /* IEEE80211_RADIOTAP_TSFT */ | |
123 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 124 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
125 | rthdr->it_present |= |
126 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
127 | pos += 8; | |
128 | } | |
129 | ||
130 | /* IEEE80211_RADIOTAP_FLAGS */ | |
131 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
132 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
133 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
134 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
135 | if (status->flag & RX_FLAG_SHORTPRE) |
136 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
137 | pos++; |
138 | ||
139 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
140 | if (status->flag & RX_FLAG_HT) { |
141 | /* | |
142 | * TODO: add following information into radiotap header once | |
143 | * suitable fields are defined for it: | |
144 | * - MCS index (status->rate_idx) | |
145 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
146 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
147 | */ | |
148 | *pos = 0; | |
8d6f658e | 149 | } else { |
ebe6c7ba | 150 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 151 | *pos = rate->bitrate / 5; |
8d6f658e | 152 | } |
601ae7f2 BR |
153 | pos++; |
154 | ||
155 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 156 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
157 | pos += 2; |
158 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
159 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
160 | pos); | |
5f0b7de5 JB |
161 | else if (status->flag & RX_FLAG_HT) |
162 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
163 | pos); | |
9deb1ae5 | 164 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
165 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
166 | pos); | |
601ae7f2 | 167 | else |
6a86b9c7 JB |
168 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
169 | pos); | |
601ae7f2 BR |
170 | pos += 2; |
171 | ||
172 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
173 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
174 | *pos = status->signal; | |
175 | rthdr->it_present |= | |
176 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
177 | pos++; | |
178 | } | |
179 | ||
601ae7f2 BR |
180 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
181 | ||
182 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
183 | *pos = status->antenna; | |
184 | pos++; | |
185 | ||
601ae7f2 BR |
186 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
187 | ||
188 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
189 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 190 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 191 | pos++; |
aae89831 | 192 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
193 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
194 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
195 | pos += 2; |
196 | } | |
197 | ||
b2e7771e JB |
198 | /* |
199 | * This function copies a received frame to all monitor interfaces and | |
200 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
201 | * radiotap header the driver might have added. | |
202 | */ | |
203 | static struct sk_buff * | |
204 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 205 | struct ieee80211_rate *rate) |
b2e7771e | 206 | { |
f1d58c25 | 207 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 208 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 209 | int needed_headroom = 0; |
b2e7771e JB |
210 | struct sk_buff *skb, *skb2; |
211 | struct net_device *prev_dev = NULL; | |
212 | int present_fcs_len = 0; | |
b2e7771e JB |
213 | |
214 | /* | |
215 | * First, we may need to make a copy of the skb because | |
216 | * (1) we need to modify it for radiotap (if not present), and | |
217 | * (2) the other RX handlers will modify the skb we got. | |
218 | * | |
219 | * We don't need to, of course, if we aren't going to return | |
220 | * the SKB because it has a bad FCS/PLCP checksum. | |
221 | */ | |
0869aea0 JB |
222 | |
223 | /* room for the radiotap header based on driver features */ | |
224 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
225 | |
226 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
227 | present_fcs_len = FCS_LEN; | |
228 | ||
e3cf8b3f ZY |
229 | /* make sure hdr->frame_control is on the linear part */ |
230 | if (!pskb_may_pull(origskb, 2)) { | |
231 | dev_kfree_skb(origskb); | |
232 | return NULL; | |
233 | } | |
234 | ||
b2e7771e | 235 | if (!local->monitors) { |
0869aea0 | 236 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
237 | dev_kfree_skb(origskb); |
238 | return NULL; | |
239 | } | |
240 | ||
0869aea0 | 241 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
242 | } |
243 | ||
0869aea0 | 244 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
245 | /* only need to expand headroom if necessary */ |
246 | skb = origskb; | |
247 | origskb = NULL; | |
248 | ||
249 | /* | |
250 | * This shouldn't trigger often because most devices have an | |
251 | * RX header they pull before we get here, and that should | |
252 | * be big enough for our radiotap information. We should | |
253 | * probably export the length to drivers so that we can have | |
254 | * them allocate enough headroom to start with. | |
255 | */ | |
256 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 257 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
258 | dev_kfree_skb(skb); |
259 | return NULL; | |
260 | } | |
261 | } else { | |
262 | /* | |
263 | * Need to make a copy and possibly remove radiotap header | |
264 | * and FCS from the original. | |
265 | */ | |
266 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
267 | ||
0869aea0 | 268 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
269 | |
270 | if (!skb) | |
271 | return origskb; | |
272 | } | |
273 | ||
0869aea0 JB |
274 | /* prepend radiotap information */ |
275 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 276 | |
ce3edf6d | 277 | skb_reset_mac_header(skb); |
b2e7771e JB |
278 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
279 | skb->pkt_type = PACKET_OTHERHOST; | |
280 | skb->protocol = htons(ETH_P_802_2); | |
281 | ||
282 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 283 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
284 | continue; |
285 | ||
3d30d949 MW |
286 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
287 | continue; | |
288 | ||
9607e6b6 | 289 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
290 | continue; |
291 | ||
b2e7771e JB |
292 | if (prev_dev) { |
293 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
294 | if (skb2) { | |
295 | skb2->dev = prev_dev; | |
5548a8a1 | 296 | netif_receive_skb(skb2); |
b2e7771e JB |
297 | } |
298 | } | |
299 | ||
300 | prev_dev = sdata->dev; | |
301 | sdata->dev->stats.rx_packets++; | |
302 | sdata->dev->stats.rx_bytes += skb->len; | |
303 | } | |
304 | ||
305 | if (prev_dev) { | |
306 | skb->dev = prev_dev; | |
5548a8a1 | 307 | netif_receive_skb(skb); |
b2e7771e JB |
308 | } else |
309 | dev_kfree_skb(skb); | |
310 | ||
311 | return origskb; | |
312 | } | |
313 | ||
314 | ||
5cf121c3 | 315 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 316 | { |
238f74a2 | 317 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 318 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
6e0d114d JB |
319 | int tid; |
320 | ||
321 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
322 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
323 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 324 | /* frame has qos control */ |
238f74a2 HH |
325 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
326 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
554891e6 | 327 | status->rx_flags |= IEEE80211_RX_AMSDU; |
6e0d114d | 328 | } else { |
1411f9b5 JB |
329 | /* |
330 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
331 | * | |
332 | * Sequence numbers for management frames, QoS data | |
333 | * frames with a broadcast/multicast address in the | |
334 | * Address 1 field, and all non-QoS data frames sent | |
335 | * by QoS STAs are assigned using an additional single | |
336 | * modulo-4096 counter, [...] | |
337 | * | |
338 | * We also use that counter for non-QoS STAs. | |
339 | */ | |
340 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 341 | } |
52865dfd | 342 | |
5cf121c3 | 343 | rx->queue = tid; |
6e0d114d JB |
344 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
345 | * For now, set skb->priority to 0 for other cases. */ | |
346 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 347 | } |
6e0d114d | 348 | |
d1c3a37c JB |
349 | /** |
350 | * DOC: Packet alignment | |
351 | * | |
352 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
353 | * to the stack. | |
354 | * | |
355 | * Additionally, should, if possible, align the payload data in a way that | |
356 | * guarantees that the contained IP header is aligned to a four-byte | |
357 | * boundary. In the case of regular frames, this simply means aligning the | |
358 | * payload to a four-byte boundary (because either the IP header is directly | |
359 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
360 | * in front of it). If the payload data is not properly aligned and the |
361 | * architecture doesn't support efficient unaligned operations, mac80211 | |
362 | * will align the data. | |
d1c3a37c JB |
363 | * |
364 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
365 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
366 | * push the IP header further back to a multiple of four again. Thankfully, the | |
367 | * specs were sane enough this time around to require padding each A-MSDU | |
368 | * subframe to a length that is a multiple of four. | |
369 | * | |
370 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
371 | * the payload is not supported, the driver is required to move the 802.11 | |
372 | * header to be directly in front of the payload in that case. | |
373 | */ | |
374 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 375 | { |
59d9cb07 KV |
376 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
377 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
378 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 379 | #endif |
6e0d114d JB |
380 | } |
381 | ||
6368e4b1 | 382 | |
571ecf67 JB |
383 | /* rx handlers */ |
384 | ||
49461622 | 385 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 386 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
387 | { |
388 | struct ieee80211_local *local = rx->local; | |
554891e6 | 389 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
390 | struct sk_buff *skb = rx->skb; |
391 | ||
554891e6 | 392 | if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN))) |
4080c7cd JB |
393 | return RX_CONTINUE; |
394 | ||
395 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) | |
f1d58c25 | 396 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 397 | |
4080c7cd | 398 | if (test_bit(SCAN_SW_SCANNING, &local->scanning)) { |
ece8eddd | 399 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 400 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 401 | dev_kfree_skb(skb); |
9ae54c84 | 402 | return RX_QUEUED; |
571ecf67 JB |
403 | } |
404 | ||
4080c7cd JB |
405 | /* scanning finished during invoking of handlers */ |
406 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
407 | return RX_DROP_UNUSABLE; | |
571ecf67 JB |
408 | } |
409 | ||
3cfcf6ac JM |
410 | |
411 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
412 | { | |
413 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
414 | ||
415 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
416 | return 0; | |
417 | ||
418 | return ieee80211_is_robust_mgmt_frame(hdr); | |
419 | } | |
420 | ||
421 | ||
422 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
423 | { | |
424 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
425 | ||
426 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
427 | return 0; | |
428 | ||
429 | return ieee80211_is_robust_mgmt_frame(hdr); | |
430 | } | |
431 | ||
432 | ||
433 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
434 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
435 | { | |
436 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
437 | struct ieee80211_mmie *mmie; | |
438 | ||
439 | if (skb->len < 24 + sizeof(*mmie) || | |
440 | !is_multicast_ether_addr(hdr->da)) | |
441 | return -1; | |
442 | ||
443 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
444 | return -1; /* not a robust management frame */ | |
445 | ||
446 | mmie = (struct ieee80211_mmie *) | |
447 | (skb->data + skb->len - sizeof(*mmie)); | |
448 | if (mmie->element_id != WLAN_EID_MMIE || | |
449 | mmie->length != sizeof(*mmie) - 2) | |
450 | return -1; | |
451 | ||
452 | return le16_to_cpu(mmie->key_id); | |
453 | } | |
454 | ||
455 | ||
33b64eb2 | 456 | static ieee80211_rx_result |
5cf121c3 | 457 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 458 | { |
a7767f95 HH |
459 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
460 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 461 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 462 | |
a7767f95 | 463 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
464 | if (is_multicast_ether_addr(hdr->addr1)) { |
465 | if (ieee80211_has_tods(hdr->frame_control) || | |
466 | !ieee80211_has_fromds(hdr->frame_control)) | |
467 | return RX_DROP_MONITOR; | |
468 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
469 | return RX_DROP_MONITOR; | |
470 | } else { | |
471 | if (!ieee80211_has_a4(hdr->frame_control)) | |
472 | return RX_DROP_MONITOR; | |
473 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
474 | return RX_DROP_MONITOR; | |
475 | } | |
33b64eb2 LCC |
476 | } |
477 | ||
478 | /* If there is not an established peer link and this is not a peer link | |
479 | * establisment frame, beacon or probe, drop the frame. | |
480 | */ | |
481 | ||
b4e08ea1 | 482 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 483 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 484 | |
a7767f95 | 485 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
486 | return RX_DROP_MONITOR; |
487 | ||
a7767f95 | 488 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 489 | mgmt = (struct ieee80211_mgmt *)hdr; |
97ad9139 | 490 | if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK) |
33b64eb2 | 491 | return RX_DROP_MONITOR; |
33b64eb2 | 492 | return RX_CONTINUE; |
33b64eb2 LCC |
493 | } |
494 | ||
a7767f95 HH |
495 | if (ieee80211_is_probe_req(hdr->frame_control) || |
496 | ieee80211_is_probe_resp(hdr->frame_control) || | |
497 | ieee80211_is_beacon(hdr->frame_control)) | |
498 | return RX_CONTINUE; | |
499 | ||
500 | return RX_DROP_MONITOR; | |
501 | ||
502 | } | |
503 | ||
504 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
505 | ||
506 | if (ieee80211_is_data(hdr->frame_control) && | |
507 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 508 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 509 | return RX_DROP_MONITOR; |
902acc78 | 510 | #undef msh_h_get |
d6d1a5a7 | 511 | |
902acc78 JB |
512 | return RX_CONTINUE; |
513 | } | |
33b64eb2 | 514 | |
1edfb1af JB |
515 | #define SEQ_MODULO 0x1000 |
516 | #define SEQ_MASK 0xfff | |
517 | ||
518 | static inline int seq_less(u16 sq1, u16 sq2) | |
519 | { | |
520 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
521 | } | |
522 | ||
523 | static inline u16 seq_inc(u16 sq) | |
524 | { | |
525 | return (sq + 1) & SEQ_MASK; | |
526 | } | |
527 | ||
528 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
529 | { | |
530 | return (sq1 - sq2) & SEQ_MASK; | |
531 | } | |
532 | ||
533 | ||
534 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
535 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 536 | int index) |
1edfb1af | 537 | { |
24a8fdad | 538 | struct ieee80211_local *local = hw_to_local(hw); |
1edfb1af | 539 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
4cfda47b | 540 | struct ieee80211_rx_status *status; |
1edfb1af | 541 | |
dd318575 JB |
542 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
543 | ||
1edfb1af JB |
544 | if (!skb) |
545 | goto no_frame; | |
546 | ||
071d9ac2 | 547 | /* release the frame from the reorder ring buffer */ |
1edfb1af JB |
548 | tid_agg_rx->stored_mpdu_num--; |
549 | tid_agg_rx->reorder_buf[index] = NULL; | |
4cfda47b CL |
550 | status = IEEE80211_SKB_RXCB(skb); |
551 | status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; | |
24a8fdad | 552 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af JB |
553 | |
554 | no_frame: | |
555 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
556 | } | |
557 | ||
558 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
559 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 560 | u16 head_seq_num) |
1edfb1af JB |
561 | { |
562 | int index; | |
563 | ||
dd318575 JB |
564 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
565 | ||
1edfb1af JB |
566 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
567 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
568 | tid_agg_rx->buf_size; | |
24a8fdad | 569 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
1edfb1af JB |
570 | } |
571 | } | |
572 | ||
573 | /* | |
574 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
575 | * the skb was added to the buffer longer than this time ago, the earlier | |
576 | * frames that have not yet been received are assumed to be lost and the skb | |
577 | * can be released for processing. This may also release other skb's from the | |
578 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
579 | * |
580 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
581 | */ |
582 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
583 | ||
aa0c8636 | 584 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
24a8fdad | 585 | struct tid_ampdu_rx *tid_agg_rx) |
aa0c8636 | 586 | { |
2bff8ebf | 587 | int index, j; |
aa0c8636 | 588 | |
dd318575 JB |
589 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
590 | ||
aa0c8636 CL |
591 | /* release the buffer until next missing frame */ |
592 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
593 | tid_agg_rx->buf_size; | |
594 | if (!tid_agg_rx->reorder_buf[index] && | |
595 | tid_agg_rx->stored_mpdu_num > 1) { | |
596 | /* | |
597 | * No buffers ready to be released, but check whether any | |
598 | * frames in the reorder buffer have timed out. | |
599 | */ | |
aa0c8636 CL |
600 | int skipped = 1; |
601 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
602 | j = (j + 1) % tid_agg_rx->buf_size) { | |
603 | if (!tid_agg_rx->reorder_buf[j]) { | |
604 | skipped++; | |
605 | continue; | |
606 | } | |
607 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
608 | HT_RX_REORDER_BUF_TIMEOUT)) | |
2bff8ebf | 609 | goto set_release_timer; |
aa0c8636 CL |
610 | |
611 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
612 | if (net_ratelimit()) | |
0fb9a9ec JP |
613 | wiphy_debug(hw->wiphy, |
614 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
aa0c8636 | 615 | #endif |
24a8fdad | 616 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
aa0c8636 CL |
617 | |
618 | /* | |
619 | * Increment the head seq# also for the skipped slots. | |
620 | */ | |
621 | tid_agg_rx->head_seq_num = | |
622 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
623 | skipped = 0; | |
624 | } | |
625 | } else while (tid_agg_rx->reorder_buf[index]) { | |
24a8fdad | 626 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
aa0c8636 CL |
627 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
628 | tid_agg_rx->buf_size; | |
629 | } | |
2bff8ebf CL |
630 | |
631 | if (tid_agg_rx->stored_mpdu_num) { | |
632 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
633 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
634 | ||
635 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
636 | j = (j + 1) % tid_agg_rx->buf_size) { | |
637 | if (tid_agg_rx->reorder_buf[j]) | |
638 | break; | |
639 | } | |
640 | ||
641 | set_release_timer: | |
642 | ||
643 | mod_timer(&tid_agg_rx->reorder_timer, | |
644 | tid_agg_rx->reorder_time[j] + | |
645 | HT_RX_REORDER_BUF_TIMEOUT); | |
646 | } else { | |
647 | del_timer(&tid_agg_rx->reorder_timer); | |
648 | } | |
aa0c8636 CL |
649 | } |
650 | ||
1edfb1af JB |
651 | /* |
652 | * As this function belongs to the RX path it must be under | |
653 | * rcu_read_lock protection. It returns false if the frame | |
654 | * can be processed immediately, true if it was consumed. | |
655 | */ | |
656 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
657 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 658 | struct sk_buff *skb) |
1edfb1af JB |
659 | { |
660 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
661 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
662 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
663 | u16 head_seq_num, buf_size; | |
664 | int index; | |
2bff8ebf | 665 | bool ret = true; |
1edfb1af | 666 | |
dd318575 JB |
667 | spin_lock(&tid_agg_rx->reorder_lock); |
668 | ||
1edfb1af JB |
669 | buf_size = tid_agg_rx->buf_size; |
670 | head_seq_num = tid_agg_rx->head_seq_num; | |
671 | ||
672 | /* frame with out of date sequence number */ | |
673 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
674 | dev_kfree_skb(skb); | |
2bff8ebf | 675 | goto out; |
1edfb1af JB |
676 | } |
677 | ||
678 | /* | |
679 | * If frame the sequence number exceeds our buffering window | |
680 | * size release some previous frames to make room for this one. | |
681 | */ | |
682 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
683 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
684 | /* release stored frames up to new head to stack */ | |
24a8fdad | 685 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); |
1edfb1af JB |
686 | } |
687 | ||
688 | /* Now the new frame is always in the range of the reordering buffer */ | |
689 | ||
690 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
691 | ||
692 | /* check if we already stored this frame */ | |
693 | if (tid_agg_rx->reorder_buf[index]) { | |
694 | dev_kfree_skb(skb); | |
2bff8ebf | 695 | goto out; |
1edfb1af JB |
696 | } |
697 | ||
698 | /* | |
699 | * If the current MPDU is in the right order and nothing else | |
700 | * is stored we can process it directly, no need to buffer it. | |
701 | */ | |
702 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
703 | tid_agg_rx->stored_mpdu_num == 0) { | |
704 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
705 | ret = false; |
706 | goto out; | |
1edfb1af JB |
707 | } |
708 | ||
709 | /* put the frame in the reordering buffer */ | |
710 | tid_agg_rx->reorder_buf[index] = skb; | |
711 | tid_agg_rx->reorder_time[index] = jiffies; | |
712 | tid_agg_rx->stored_mpdu_num++; | |
24a8fdad | 713 | ieee80211_sta_reorder_release(hw, tid_agg_rx); |
1edfb1af | 714 | |
2bff8ebf CL |
715 | out: |
716 | spin_unlock(&tid_agg_rx->reorder_lock); | |
717 | return ret; | |
1edfb1af JB |
718 | } |
719 | ||
720 | /* | |
721 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
722 | * true if the MPDU was buffered, false if it should be processed. | |
723 | */ | |
24a8fdad | 724 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) |
1edfb1af | 725 | { |
2569a826 JB |
726 | struct sk_buff *skb = rx->skb; |
727 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
728 | struct ieee80211_hw *hw = &local->hw; |
729 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 730 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
731 | struct tid_ampdu_rx *tid_agg_rx; |
732 | u16 sc; | |
733 | int tid; | |
734 | ||
735 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 736 | goto dont_reorder; |
1edfb1af JB |
737 | |
738 | /* | |
739 | * filter the QoS data rx stream according to | |
740 | * STA/TID and check if this STA/TID is on aggregation | |
741 | */ | |
742 | ||
1edfb1af | 743 | if (!sta) |
2569a826 | 744 | goto dont_reorder; |
1edfb1af JB |
745 | |
746 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
747 | ||
a87f736d JB |
748 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
749 | if (!tid_agg_rx) | |
750 | goto dont_reorder; | |
1edfb1af JB |
751 | |
752 | /* qos null data frames are excluded */ | |
753 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 754 | goto dont_reorder; |
1edfb1af JB |
755 | |
756 | /* new, potentially un-ordered, ampdu frame - process it */ | |
757 | ||
758 | /* reset session timer */ | |
759 | if (tid_agg_rx->timeout) | |
760 | mod_timer(&tid_agg_rx->session_timer, | |
761 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
762 | ||
763 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
764 | sc = le16_to_cpu(hdr->seq_ctrl); | |
765 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 766 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
767 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
768 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 769 | return; |
1edfb1af JB |
770 | } |
771 | ||
a87f736d JB |
772 | /* |
773 | * No locking needed -- we will only ever process one | |
774 | * RX packet at a time, and thus own tid_agg_rx. All | |
775 | * other code manipulating it needs to (and does) make | |
776 | * sure that we cannot get to it any more before doing | |
777 | * anything with it. | |
778 | */ | |
24a8fdad | 779 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) |
2569a826 JB |
780 | return; |
781 | ||
782 | dont_reorder: | |
24a8fdad | 783 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af | 784 | } |
33b64eb2 | 785 | |
49461622 | 786 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 787 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 788 | { |
a7767f95 | 789 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 790 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
791 | |
792 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
793 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 794 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 795 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 796 | hdr->seq_ctrl)) { |
554891e6 | 797 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
798 | rx->local->dot11FrameDuplicateCount++; |
799 | rx->sta->num_duplicates++; | |
800 | } | |
e4c26add | 801 | return RX_DROP_MONITOR; |
571ecf67 | 802 | } else |
5cf121c3 | 803 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
804 | } |
805 | ||
571ecf67 JB |
806 | if (unlikely(rx->skb->len < 16)) { |
807 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 808 | return RX_DROP_MONITOR; |
571ecf67 JB |
809 | } |
810 | ||
571ecf67 JB |
811 | /* Drop disallowed frame classes based on STA auth/assoc state; |
812 | * IEEE 802.11, Chap 5.5. | |
813 | * | |
ccd7b362 JB |
814 | * mac80211 filters only based on association state, i.e. it drops |
815 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
816 | * deauth/disassoc frames when needed. In addition, hostapd is |
817 | * responsible for filtering on both auth and assoc states. | |
818 | */ | |
33b64eb2 | 819 | |
902acc78 | 820 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 821 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 822 | |
a7767f95 HH |
823 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
824 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 825 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
1be7fe8d | 826 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && |
07346f81 | 827 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
828 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
829 | !ieee80211_has_tods(hdr->frame_control) && | |
830 | ieee80211_is_data(hdr->frame_control)) || | |
554891e6 | 831 | !(status->rx_flags & IEEE80211_RX_RA_MATCH)) { |
571ecf67 JB |
832 | /* Drop IBSS frames and frames for other hosts |
833 | * silently. */ | |
e4c26add | 834 | return RX_DROP_MONITOR; |
571ecf67 JB |
835 | } |
836 | ||
e4c26add | 837 | return RX_DROP_MONITOR; |
571ecf67 JB |
838 | } |
839 | ||
9ae54c84 | 840 | return RX_CONTINUE; |
570bd537 JB |
841 | } |
842 | ||
843 | ||
49461622 | 844 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 845 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 846 | { |
eb9fb5b8 JB |
847 | struct sk_buff *skb = rx->skb; |
848 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
849 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
850 | int keyidx; |
851 | int hdrlen; | |
e4c26add | 852 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
e31b8213 | 853 | struct ieee80211_key *sta_ptk = NULL; |
3cfcf6ac | 854 | int mmie_keyidx = -1; |
761ab470 | 855 | __le16 fc; |
570bd537 | 856 | |
3017b80b JB |
857 | /* |
858 | * Key selection 101 | |
859 | * | |
3cfcf6ac | 860 | * There are four types of keys: |
3017b80b | 861 | * - GTK (group keys) |
3cfcf6ac | 862 | * - IGTK (group keys for management frames) |
3017b80b JB |
863 | * - PTK (pairwise keys) |
864 | * - STK (station-to-station pairwise keys) | |
865 | * | |
866 | * When selecting a key, we have to distinguish between multicast | |
867 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
868 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
869 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
870 | * unicast frames can also use key indices like GTKs. Hence, if we | |
871 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 872 | * |
8dc06a1c JB |
873 | * Note that in a regular BSS, multicast frames are sent by the |
874 | * AP only, associated stations unicast the frame to the AP first | |
875 | * which then multicasts it on their behalf. | |
876 | * | |
3017b80b JB |
877 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
878 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
879 | * The spec seems to expect that one negotiates the same key with |
880 | * every station but there's no such requirement; VLANs could be | |
881 | * possible. | |
3017b80b JB |
882 | */ |
883 | ||
3017b80b | 884 | /* |
1990af8d | 885 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
886 | * addressed to us nor a multicast frame. |
887 | */ | |
554891e6 | 888 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 889 | return RX_CONTINUE; |
3017b80b | 890 | |
2569a826 JB |
891 | /* start without a key */ |
892 | rx->key = NULL; | |
893 | ||
d4e46a3d | 894 | if (rx->sta) |
e31b8213 | 895 | sta_ptk = rcu_dereference(rx->sta->ptk); |
d4e46a3d | 896 | |
761ab470 JB |
897 | fc = hdr->frame_control; |
898 | ||
899 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
900 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
901 | ||
e31b8213 JB |
902 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
903 | rx->key = sta_ptk; | |
dc1580dd JB |
904 | if ((status->flag & RX_FLAG_DECRYPTED) && |
905 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
906 | return RX_CONTINUE; | |
0c7c10c7 | 907 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 908 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 909 | return RX_CONTINUE; |
3cfcf6ac JM |
910 | } else if (mmie_keyidx >= 0) { |
911 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
912 | if ((status->flag & RX_FLAG_DECRYPTED) && |
913 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
914 | return RX_CONTINUE; |
915 | ||
916 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
917 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
918 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
e31b8213 JB |
919 | if (rx->sta) |
920 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
921 | if (!rx->key) | |
922 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 923 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
924 | /* |
925 | * The frame was not protected, so skip decryption. However, we | |
926 | * need to set rx->key if there is a key that could have been | |
927 | * used so that the frame may be dropped if encryption would | |
928 | * have been expected. | |
929 | */ | |
930 | struct ieee80211_key *key = NULL; | |
897bed8b JB |
931 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
932 | int i; | |
933 | ||
761ab470 | 934 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
935 | is_multicast_ether_addr(hdr->addr1) && |
936 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
937 | rx->key = key; | |
897bed8b JB |
938 | else { |
939 | if (rx->sta) { | |
940 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
941 | key = rcu_dereference(rx->sta->gtk[i]); | |
942 | if (key) | |
943 | break; | |
944 | } | |
945 | } | |
946 | if (!key) { | |
947 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
948 | key = rcu_dereference(sdata->keys[i]); | |
949 | if (key) | |
950 | break; | |
951 | } | |
952 | } | |
953 | if (key) | |
954 | rx->key = key; | |
955 | } | |
0c7c10c7 | 956 | return RX_CONTINUE; |
571ecf67 | 957 | } else { |
39184b15 | 958 | u8 keyid; |
3017b80b JB |
959 | /* |
960 | * The device doesn't give us the IV so we won't be | |
961 | * able to look up the key. That's ok though, we | |
962 | * don't need to decrypt the frame, we just won't | |
963 | * be able to keep statistics accurate. | |
964 | * Except for key threshold notifications, should | |
965 | * we somehow allow the driver to tell us which key | |
966 | * the hardware used if this flag is set? | |
967 | */ | |
eb9fb5b8 JB |
968 | if ((status->flag & RX_FLAG_DECRYPTED) && |
969 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 970 | return RX_CONTINUE; |
3017b80b | 971 | |
761ab470 | 972 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
973 | |
974 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 975 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
976 | |
977 | /* | |
978 | * no need to call ieee80211_wep_get_keyidx, | |
979 | * it verifies a bunch of things we've done already | |
980 | */ | |
39184b15 ZY |
981 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
982 | keyidx = keyid >> 6; | |
3017b80b | 983 | |
e31b8213 JB |
984 | /* check per-station GTK first, if multicast packet */ |
985 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
986 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
3017b80b | 987 | |
e31b8213 JB |
988 | /* if not found, try default key */ |
989 | if (!rx->key) { | |
990 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
991 | ||
992 | /* | |
993 | * RSNA-protected unicast frames should always be | |
994 | * sent with pairwise or station-to-station keys, | |
995 | * but for WEP we allow using a key index as well. | |
996 | */ | |
997 | if (rx->key && | |
998 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
999 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1000 | !is_multicast_ether_addr(hdr->addr1)) | |
1001 | rx->key = NULL; | |
1002 | } | |
571ecf67 JB |
1003 | } |
1004 | ||
3017b80b | 1005 | if (rx->key) { |
571ecf67 | 1006 | rx->key->tx_rx_count++; |
011bfcc4 | 1007 | /* TODO: add threshold stuff again */ |
1990af8d | 1008 | } else { |
e4c26add | 1009 | return RX_DROP_MONITOR; |
70f08765 JB |
1010 | } |
1011 | ||
39184b15 ZY |
1012 | if (skb_linearize(rx->skb)) |
1013 | return RX_DROP_UNUSABLE; | |
761ab470 | 1014 | /* the hdr variable is invalid now! */ |
1990af8d | 1015 | |
97359d12 JB |
1016 | switch (rx->key->conf.cipher) { |
1017 | case WLAN_CIPHER_SUITE_WEP40: | |
1018 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
1019 | /* Check for weak IVs if possible */ |
1020 | if (rx->sta && ieee80211_is_data(fc) && | |
1021 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
1022 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1023 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
1024 | rx->sta->wep_weak_iv_count++; | |
1025 | ||
e2f036da MN |
1026 | result = ieee80211_crypto_wep_decrypt(rx); |
1027 | break; | |
97359d12 | 1028 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
1029 | result = ieee80211_crypto_tkip_decrypt(rx); |
1030 | break; | |
97359d12 | 1031 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1032 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1033 | break; | |
97359d12 | 1034 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1035 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1036 | break; | |
3ffc2a90 JB |
1037 | default: |
1038 | /* | |
1039 | * We can reach here only with HW-only algorithms | |
1040 | * but why didn't it decrypt the frame?! | |
1041 | */ | |
1042 | return RX_DROP_UNUSABLE; | |
70f08765 JB |
1043 | } |
1044 | ||
e2f036da | 1045 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1046 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1047 | |
1048 | return result; | |
70f08765 JB |
1049 | } |
1050 | ||
572e0012 KV |
1051 | static ieee80211_rx_result debug_noinline |
1052 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1053 | { | |
1054 | struct ieee80211_local *local; | |
1055 | struct ieee80211_hdr *hdr; | |
1056 | struct sk_buff *skb; | |
1057 | ||
1058 | local = rx->local; | |
1059 | skb = rx->skb; | |
1060 | hdr = (struct ieee80211_hdr *) skb->data; | |
1061 | ||
1062 | if (!local->pspolling) | |
1063 | return RX_CONTINUE; | |
1064 | ||
1065 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1066 | /* this is not from AP */ | |
1067 | return RX_CONTINUE; | |
1068 | ||
1069 | if (!ieee80211_is_data(hdr->frame_control)) | |
1070 | return RX_CONTINUE; | |
1071 | ||
1072 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1073 | /* AP has no more frames buffered for us */ | |
1074 | local->pspolling = false; | |
1075 | return RX_CONTINUE; | |
1076 | } | |
1077 | ||
1078 | /* more data bit is set, let's request a new frame from the AP */ | |
1079 | ieee80211_send_pspoll(local, rx->sdata); | |
1080 | ||
1081 | return RX_CONTINUE; | |
1082 | } | |
1083 | ||
133b8226 | 1084 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1085 | { |
133b8226 | 1086 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1087 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1088 | |
3e122be0 | 1089 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1090 | set_sta_flags(sta, WLAN_STA_PS_STA); |
12375ef9 | 1091 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1092 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1093 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1094 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1095 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1096 | } | |
1097 | ||
ff9458d3 | 1098 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1099 | { |
133b8226 | 1100 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1101 | |
3e122be0 | 1102 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1103 | |
571ecf67 | 1104 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1105 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1106 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1107 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1108 | |
af818581 | 1109 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1110 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1111 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1112 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1113 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1114 | return; |
1115 | } | |
1116 | ||
1117 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1118 | } |
1119 | ||
49461622 | 1120 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1121 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1122 | { |
1123 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1124 | struct sk_buff *skb = rx->skb; |
1125 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1126 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1127 | |
1128 | if (!sta) | |
9ae54c84 | 1129 | return RX_CONTINUE; |
571ecf67 | 1130 | |
b291ba11 JB |
1131 | /* |
1132 | * Update last_rx only for IBSS packets which are for the current | |
1133 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1134 | * where other STAs start using different BSSID. | |
1135 | */ | |
05c914fe | 1136 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1137 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1138 | NL80211_IFTYPE_ADHOC); |
46900298 | 1139 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1140 | sta->last_rx = jiffies; |
b291ba11 JB |
1141 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1142 | /* | |
33b64eb2 LCC |
1143 | * Mesh beacons will update last_rx when if they are found to |
1144 | * match the current local configuration when processed. | |
571ecf67 | 1145 | */ |
b291ba11 | 1146 | sta->last_rx = jiffies; |
571ecf67 JB |
1147 | } |
1148 | ||
554891e6 | 1149 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1150 | return RX_CONTINUE; |
571ecf67 | 1151 | |
3cf335d5 KV |
1152 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1153 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1154 | ||
571ecf67 JB |
1155 | sta->rx_fragments++; |
1156 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1157 | sta->last_signal = status->signal; |
541a45a1 | 1158 | ewma_add(&sta->avg_signal, -status->signal); |
571ecf67 | 1159 | |
72eaa43a JB |
1160 | /* |
1161 | * Change STA power saving mode only at the end of a frame | |
1162 | * exchange sequence. | |
1163 | */ | |
3e122be0 | 1164 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
4cfda47b | 1165 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
05c914fe JB |
1166 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1167 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1168 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1169 | /* |
1170 | * Ignore doze->wake transitions that are | |
1171 | * indicated by non-data frames, the standard | |
1172 | * is unclear here, but for example going to | |
1173 | * PS mode and then scanning would cause a | |
1174 | * doze->wake transition for the probe request, | |
1175 | * and that is clearly undesirable. | |
1176 | */ | |
1177 | if (ieee80211_is_data(hdr->frame_control) && | |
1178 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1179 | ap_sta_ps_end(sta); |
72eaa43a JB |
1180 | } else { |
1181 | if (ieee80211_has_pm(hdr->frame_control)) | |
1182 | ap_sta_ps_start(sta); | |
1183 | } | |
571ecf67 JB |
1184 | } |
1185 | ||
22403def JB |
1186 | /* |
1187 | * Drop (qos-)data::nullfunc frames silently, since they | |
1188 | * are used only to control station power saving mode. | |
1189 | */ | |
1190 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1191 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1192 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1193 | |
1194 | /* | |
1195 | * If we receive a 4-addr nullfunc frame from a STA | |
1196 | * that was not moved to a 4-addr STA vlan yet, drop | |
1197 | * the frame to the monitor interface, to make sure | |
1198 | * that hostapd sees it | |
1199 | */ | |
1200 | if (ieee80211_has_a4(hdr->frame_control) && | |
1201 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1202 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1203 | !rx->sdata->u.vlan.sta))) | |
1204 | return RX_DROP_MONITOR; | |
22403def JB |
1205 | /* |
1206 | * Update counter and free packet here to avoid | |
1207 | * counting this as a dropped packed. | |
1208 | */ | |
571ecf67 JB |
1209 | sta->rx_packets++; |
1210 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1211 | return RX_QUEUED; |
571ecf67 JB |
1212 | } |
1213 | ||
9ae54c84 | 1214 | return RX_CONTINUE; |
571ecf67 JB |
1215 | } /* ieee80211_rx_h_sta_process */ |
1216 | ||
571ecf67 JB |
1217 | static inline struct ieee80211_fragment_entry * |
1218 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1219 | unsigned int frag, unsigned int seq, int rx_queue, | |
1220 | struct sk_buff **skb) | |
1221 | { | |
1222 | struct ieee80211_fragment_entry *entry; | |
1223 | int idx; | |
1224 | ||
1225 | idx = sdata->fragment_next; | |
1226 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1227 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1228 | sdata->fragment_next = 0; | |
1229 | ||
1230 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1231 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1232 | struct ieee80211_hdr *hdr = |
1233 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1234 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1235 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1236 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1237 | sdata->name, idx, |
571ecf67 | 1238 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1239 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1240 | #endif |
571ecf67 JB |
1241 | __skb_queue_purge(&entry->skb_list); |
1242 | } | |
1243 | ||
1244 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1245 | *skb = NULL; | |
1246 | entry->first_frag_time = jiffies; | |
1247 | entry->seq = seq; | |
1248 | entry->rx_queue = rx_queue; | |
1249 | entry->last_frag = frag; | |
1250 | entry->ccmp = 0; | |
1251 | entry->extra_len = 0; | |
1252 | ||
1253 | return entry; | |
1254 | } | |
1255 | ||
1256 | static inline struct ieee80211_fragment_entry * | |
1257 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1258 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1259 | int rx_queue, struct ieee80211_hdr *hdr) |
1260 | { | |
1261 | struct ieee80211_fragment_entry *entry; | |
1262 | int i, idx; | |
1263 | ||
1264 | idx = sdata->fragment_next; | |
1265 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1266 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1267 | |
1268 | idx--; | |
1269 | if (idx < 0) | |
1270 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1271 | ||
1272 | entry = &sdata->fragments[idx]; | |
1273 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1274 | entry->rx_queue != rx_queue || | |
1275 | entry->last_frag + 1 != frag) | |
1276 | continue; | |
1277 | ||
b73d70ad | 1278 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1279 | |
b73d70ad HH |
1280 | /* |
1281 | * Check ftype and addresses are equal, else check next fragment | |
1282 | */ | |
1283 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1284 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1285 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1286 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1287 | continue; | |
1288 | ||
ab46623e | 1289 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1290 | __skb_queue_purge(&entry->skb_list); |
1291 | continue; | |
1292 | } | |
1293 | return entry; | |
1294 | } | |
1295 | ||
1296 | return NULL; | |
1297 | } | |
1298 | ||
49461622 | 1299 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1300 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1301 | { |
1302 | struct ieee80211_hdr *hdr; | |
1303 | u16 sc; | |
358c8d9d | 1304 | __le16 fc; |
571ecf67 JB |
1305 | unsigned int frag, seq; |
1306 | struct ieee80211_fragment_entry *entry; | |
1307 | struct sk_buff *skb; | |
554891e6 | 1308 | struct ieee80211_rx_status *status; |
571ecf67 | 1309 | |
b73d70ad | 1310 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1311 | fc = hdr->frame_control; |
571ecf67 JB |
1312 | sc = le16_to_cpu(hdr->seq_ctrl); |
1313 | frag = sc & IEEE80211_SCTL_FRAG; | |
1314 | ||
358c8d9d | 1315 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1316 | (rx->skb)->len < 24 || |
1317 | is_multicast_ether_addr(hdr->addr1))) { | |
1318 | /* not fragmented */ | |
1319 | goto out; | |
1320 | } | |
1321 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1322 | ||
e3cf8b3f ZY |
1323 | if (skb_linearize(rx->skb)) |
1324 | return RX_DROP_UNUSABLE; | |
1325 | ||
058897a4 AK |
1326 | /* |
1327 | * skb_linearize() might change the skb->data and | |
1328 | * previously cached variables (in this case, hdr) need to | |
1329 | * be refreshed with the new data. | |
1330 | */ | |
1331 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1332 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1333 | ||
1334 | if (frag == 0) { | |
1335 | /* This is the first fragment of a new frame. */ | |
1336 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1337 | rx->queue, &(rx->skb)); |
97359d12 | 1338 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1339 | ieee80211_has_protected(fc)) { |
9190252c JM |
1340 | int queue = ieee80211_is_mgmt(fc) ? |
1341 | NUM_RX_DATA_QUEUES : rx->queue; | |
571ecf67 JB |
1342 | /* Store CCMP PN so that we can verify that the next |
1343 | * fragment has a sequential PN value. */ | |
1344 | entry->ccmp = 1; | |
1345 | memcpy(entry->last_pn, | |
9190252c | 1346 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1347 | CCMP_PN_LEN); |
1348 | } | |
9ae54c84 | 1349 | return RX_QUEUED; |
571ecf67 JB |
1350 | } |
1351 | ||
1352 | /* This is a fragment for a frame that should already be pending in | |
1353 | * fragment cache. Add this fragment to the end of the pending entry. | |
1354 | */ | |
b73d70ad | 1355 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1356 | if (!entry) { |
1357 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1358 | return RX_DROP_MONITOR; |
571ecf67 JB |
1359 | } |
1360 | ||
1361 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1362 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1363 | if (entry->ccmp) { | |
1364 | int i; | |
1365 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1366 | int queue; |
97359d12 | 1367 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1368 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1369 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1370 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1371 | pn[i]++; | |
1372 | if (pn[i]) | |
1373 | break; | |
1374 | } | |
9190252c JM |
1375 | queue = ieee80211_is_mgmt(fc) ? |
1376 | NUM_RX_DATA_QUEUES : rx->queue; | |
1377 | rpn = rx->key->u.ccmp.rx_pn[queue]; | |
f4ea83dd | 1378 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1379 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1380 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1381 | } | |
1382 | ||
358c8d9d | 1383 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1384 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1385 | entry->last_frag = frag; | |
1386 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1387 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1388 | rx->skb = NULL; |
9ae54c84 | 1389 | return RX_QUEUED; |
571ecf67 JB |
1390 | } |
1391 | ||
1392 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1393 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1394 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1395 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1396 | GFP_ATOMIC))) { | |
1397 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1398 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1399 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1400 | } |
1401 | } | |
1402 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1403 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1404 | dev_kfree_skb(skb); | |
1405 | } | |
1406 | ||
1407 | /* Complete frame has been reassembled - process it now */ | |
554891e6 JB |
1408 | status = IEEE80211_SKB_RXCB(rx->skb); |
1409 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
571ecf67 JB |
1410 | |
1411 | out: | |
1412 | if (rx->sta) | |
1413 | rx->sta->rx_packets++; | |
1414 | if (is_multicast_ether_addr(hdr->addr1)) | |
1415 | rx->local->dot11MulticastReceivedFrameCount++; | |
1416 | else | |
1417 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1418 | return RX_CONTINUE; |
571ecf67 JB |
1419 | } |
1420 | ||
49461622 | 1421 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1422 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1423 | { |
af818581 | 1424 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1425 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
554891e6 | 1426 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1427 | |
358c8d9d | 1428 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
554891e6 | 1429 | !(status->rx_flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1430 | return RX_CONTINUE; |
571ecf67 | 1431 | |
05c914fe JB |
1432 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1433 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1434 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1435 | |
af818581 JB |
1436 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1437 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1438 | else | |
1439 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1440 | |
9ae54c84 | 1441 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1442 | * count as an dropped frame. */ |
1443 | dev_kfree_skb(rx->skb); | |
1444 | ||
9ae54c84 | 1445 | return RX_QUEUED; |
571ecf67 JB |
1446 | } |
1447 | ||
49461622 | 1448 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1449 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1450 | { |
6e0d114d | 1451 | u8 *data = rx->skb->data; |
238f74a2 | 1452 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1453 | |
238f74a2 | 1454 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1455 | return RX_CONTINUE; |
6e0d114d JB |
1456 | |
1457 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1458 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1459 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1460 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1461 | /* change frame type to non QOS */ |
238f74a2 | 1462 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1463 | |
9ae54c84 | 1464 | return RX_CONTINUE; |
6e0d114d JB |
1465 | } |
1466 | ||
76ee65bf | 1467 | static int |
5cf121c3 | 1468 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1469 | { |
07346f81 | 1470 | if (unlikely(!rx->sta || |
f4ea83dd | 1471 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1472 | return -EACCES; |
571ecf67 | 1473 | |
76ee65bf | 1474 | return 0; |
571ecf67 JB |
1475 | } |
1476 | ||
76ee65bf | 1477 | static int |
358c8d9d | 1478 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1479 | { |
eb9fb5b8 JB |
1480 | struct sk_buff *skb = rx->skb; |
1481 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1482 | ||
3017b80b | 1483 | /* |
7848ba7d JB |
1484 | * Pass through unencrypted frames if the hardware has |
1485 | * decrypted them already. | |
3017b80b | 1486 | */ |
eb9fb5b8 | 1487 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1488 | return 0; |
571ecf67 JB |
1489 | |
1490 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1491 | if (unlikely(!ieee80211_has_protected(fc) && |
1492 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1493 | ieee80211_is_data(fc) && |
b3fc9c6c | 1494 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1495 | return -EACCES; |
bef5d1c7 JB |
1496 | |
1497 | return 0; | |
1498 | } | |
1499 | ||
1500 | static int | |
1501 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1502 | { | |
1503 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1504 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1505 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1506 | |
e3efca0a JM |
1507 | /* |
1508 | * Pass through unencrypted frames if the hardware has | |
1509 | * decrypted them already. | |
1510 | */ | |
1511 | if (status->flag & RX_FLAG_DECRYPTED) | |
1512 | return 0; | |
bef5d1c7 | 1513 | |
f2ca3ea4 | 1514 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1515 | if (unlikely(!ieee80211_has_protected(fc) && |
1516 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
cf4e594e JM |
1517 | rx->key)) { |
1518 | if (ieee80211_is_deauth(fc)) | |
1519 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1520 | rx->skb->data, | |
1521 | rx->skb->len); | |
1522 | else if (ieee80211_is_disassoc(fc)) | |
1523 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1524 | rx->skb->data, | |
1525 | rx->skb->len); | |
f2ca3ea4 | 1526 | return -EACCES; |
cf4e594e | 1527 | } |
f2ca3ea4 | 1528 | /* BIP does not use Protected field, so need to check MMIE */ |
f64f9e71 | 1529 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
cf4e594e JM |
1530 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
1531 | if (ieee80211_is_deauth(fc)) | |
1532 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1533 | rx->skb->data, | |
1534 | rx->skb->len); | |
1535 | else if (ieee80211_is_disassoc(fc)) | |
1536 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1537 | rx->skb->data, | |
1538 | rx->skb->len); | |
f2ca3ea4 | 1539 | return -EACCES; |
cf4e594e | 1540 | } |
f2ca3ea4 JM |
1541 | /* |
1542 | * When using MFP, Action frames are not allowed prior to | |
1543 | * having configured keys. | |
1544 | */ | |
1545 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1546 | ieee80211_is_robust_mgmt_frame( | |
1547 | (struct ieee80211_hdr *) rx->skb->data))) | |
1548 | return -EACCES; | |
1549 | } | |
b3fc9c6c | 1550 | |
76ee65bf | 1551 | return 0; |
571ecf67 JB |
1552 | } |
1553 | ||
76ee65bf | 1554 | static int |
e31a16d6 | 1555 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1556 | { |
eb9fb5b8 | 1557 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee | 1558 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
fbb327c5 FF |
1559 | bool check_port_control = false; |
1560 | struct ethhdr *ehdr; | |
1561 | int ret; | |
f14543ee | 1562 | |
9bc383de JB |
1563 | if (ieee80211_has_a4(hdr->frame_control) && |
1564 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1565 | return -1; |
9bc383de | 1566 | |
fbb327c5 FF |
1567 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
1568 | !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { | |
1569 | ||
1570 | if (!sdata->u.mgd.use_4addr) | |
1571 | return -1; | |
1572 | else | |
1573 | check_port_control = true; | |
1574 | } | |
1575 | ||
9bc383de | 1576 | if (is_multicast_ether_addr(hdr->addr1) && |
fbb327c5 | 1577 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) |
f14543ee | 1578 | return -1; |
571ecf67 | 1579 | |
fbb327c5 FF |
1580 | ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
1581 | if (ret < 0 || !check_port_control) | |
1582 | return ret; | |
1583 | ||
1584 | ehdr = (struct ethhdr *) rx->skb->data; | |
1585 | if (ehdr->h_proto != rx->sdata->control_port_protocol) | |
1586 | return -1; | |
1587 | ||
1588 | return 0; | |
76ee65bf | 1589 | } |
571ecf67 | 1590 | |
ce3edf6d JB |
1591 | /* |
1592 | * requires that rx->skb is a frame with ethernet header | |
1593 | */ | |
358c8d9d | 1594 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1595 | { |
c97c23e3 | 1596 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1597 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1598 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1599 | ||
1600 | /* | |
1601 | * Allow EAPOL frames to us/the PAE group address regardless | |
1602 | * of whether the frame was encrypted or not. | |
1603 | */ | |
a621fa4d | 1604 | if (ehdr->h_proto == rx->sdata->control_port_protocol && |
47846c9b | 1605 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1606 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1607 | return true; | |
1608 | ||
1609 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1610 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1611 | return false; |
1612 | ||
1613 | return true; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * requires that rx->skb is a frame with ethernet header | |
1618 | */ | |
76ee65bf | 1619 | static void |
5cf121c3 | 1620 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1621 | { |
eb9fb5b8 JB |
1622 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1623 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1624 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1625 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1626 | struct sta_info *dsta; | |
554891e6 | 1627 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1628 | |
76ee65bf RR |
1629 | skb = rx->skb; |
1630 | xmit_skb = NULL; | |
571ecf67 | 1631 | |
05c914fe JB |
1632 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1633 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1634 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
554891e6 | 1635 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
9bc383de | 1636 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
ce3edf6d JB |
1637 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1638 | /* | |
1639 | * send multicast frames both to higher layers in | |
1640 | * local net stack and back to the wireless medium | |
1641 | */ | |
76ee65bf RR |
1642 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1643 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1644 | printk(KERN_DEBUG "%s: failed to clone " |
1645 | "multicast frame\n", dev->name); | |
1646 | } else { | |
abe60632 JB |
1647 | dsta = sta_info_get(sdata, skb->data); |
1648 | if (dsta) { | |
ce3edf6d JB |
1649 | /* |
1650 | * The destination station is associated to | |
1651 | * this AP (in this VLAN), so send the frame | |
1652 | * directly to it and do not pass it to local | |
1653 | * net stack. | |
571ecf67 | 1654 | */ |
76ee65bf | 1655 | xmit_skb = skb; |
571ecf67 JB |
1656 | skb = NULL; |
1657 | } | |
571ecf67 JB |
1658 | } |
1659 | } | |
1660 | ||
1661 | if (skb) { | |
d1c3a37c JB |
1662 | int align __maybe_unused; |
1663 | ||
59d9cb07 | 1664 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1665 | /* |
1666 | * 'align' will only take the values 0 or 2 here | |
1667 | * since all frames are required to be aligned | |
1668 | * to 2-byte boundaries when being passed to | |
1669 | * mac80211. That also explains the __skb_push() | |
1670 | * below. | |
1671 | */ | |
dacb6f1d | 1672 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1673 | if (align) { |
1674 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1675 | dev_kfree_skb(skb); | |
1676 | skb = NULL; | |
1677 | } else { | |
1678 | u8 *data = skb->data; | |
8ce0b589 ZY |
1679 | size_t len = skb_headlen(skb); |
1680 | skb->data -= align; | |
1681 | memmove(skb->data, data, len); | |
1682 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1683 | } |
1684 | } | |
1685 | #endif | |
1686 | ||
1687 | if (skb) { | |
1688 | /* deliver to local stack */ | |
1689 | skb->protocol = eth_type_trans(skb, dev); | |
1690 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1691 | netif_receive_skb(skb); |
d1c3a37c | 1692 | } |
571ecf67 JB |
1693 | } |
1694 | ||
76ee65bf | 1695 | if (xmit_skb) { |
571ecf67 | 1696 | /* send to wireless media */ |
f831e909 | 1697 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1698 | skb_reset_network_header(xmit_skb); |
1699 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1700 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1701 | } |
76ee65bf RR |
1702 | } |
1703 | ||
49461622 | 1704 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1705 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1706 | { |
eb9fb5b8 | 1707 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1708 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1709 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1710 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1711 | struct sk_buff_head frame_list; |
554891e6 | 1712 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
fd4c7f2f | 1713 | |
358c8d9d | 1714 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1715 | return RX_CONTINUE; |
fd4c7f2f | 1716 | |
358c8d9d | 1717 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1718 | return RX_DROP_MONITOR; |
fd4c7f2f | 1719 | |
554891e6 | 1720 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1721 | return RX_CONTINUE; |
fd4c7f2f | 1722 | |
eaf85ca7 ZY |
1723 | if (ieee80211_has_a4(hdr->frame_control) && |
1724 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1725 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1726 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1727 | |
eaf85ca7 ZY |
1728 | if (is_multicast_ether_addr(hdr->addr1) && |
1729 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1730 | rx->sdata->u.vlan.sta) || | |
1731 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1732 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1733 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1734 | |
eaf85ca7 ZY |
1735 | skb->dev = dev; |
1736 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1737 | |
e3cf8b3f ZY |
1738 | if (skb_linearize(skb)) |
1739 | return RX_DROP_UNUSABLE; | |
1740 | ||
eaf85ca7 ZY |
1741 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1742 | rx->sdata->vif.type, | |
1743 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1744 | |
eaf85ca7 ZY |
1745 | while (!skb_queue_empty(&frame_list)) { |
1746 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1747 | |
358c8d9d | 1748 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1749 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1750 | continue; |
1751 | } | |
eaf85ca7 ZY |
1752 | dev->stats.rx_packets++; |
1753 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1754 | |
1755 | ieee80211_deliver_skb(rx); | |
1756 | } | |
1757 | ||
9ae54c84 | 1758 | return RX_QUEUED; |
fd4c7f2f RR |
1759 | } |
1760 | ||
bf94e17b | 1761 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1762 | static ieee80211_rx_result |
e32f85f7 LCC |
1763 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1764 | { | |
1765 | struct ieee80211_hdr *hdr; | |
1766 | struct ieee80211s_hdr *mesh_hdr; | |
1767 | unsigned int hdrlen; | |
1768 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1769 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1770 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
554891e6 | 1771 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
e32f85f7 LCC |
1772 | |
1773 | hdr = (struct ieee80211_hdr *) skb->data; | |
1774 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1775 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1776 | ||
1777 | if (!ieee80211_is_data(hdr->frame_control)) | |
1778 | return RX_CONTINUE; | |
1779 | ||
1780 | if (!mesh_hdr->ttl) | |
1781 | /* illegal frame */ | |
1782 | return RX_DROP_MONITOR; | |
1783 | ||
43b7b314 | 1784 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1785 | struct mesh_path *mppath; |
43b7b314 JC |
1786 | char *proxied_addr; |
1787 | char *mpp_addr; | |
1788 | ||
1789 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1790 | mpp_addr = hdr->addr3; | |
1791 | proxied_addr = mesh_hdr->eaddr1; | |
1792 | } else { | |
1793 | mpp_addr = hdr->addr4; | |
1794 | proxied_addr = mesh_hdr->eaddr2; | |
1795 | } | |
79617dee | 1796 | |
79617dee | 1797 | rcu_read_lock(); |
43b7b314 | 1798 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1799 | if (!mppath) { |
43b7b314 | 1800 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1801 | } else { |
1802 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1803 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1804 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1805 | spin_unlock_bh(&mppath->state_lock); |
1806 | } | |
1807 | rcu_read_unlock(); | |
1808 | } | |
1809 | ||
3c5772a5 JC |
1810 | /* Frame has reached destination. Don't forward */ |
1811 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1812 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1813 | return RX_CONTINUE; |
1814 | ||
1815 | mesh_hdr->ttl--; | |
1816 | ||
554891e6 | 1817 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
e32f85f7 | 1818 | if (!mesh_hdr->ttl) |
472dbc45 | 1819 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1820 | dropped_frames_ttl); |
1821 | else { | |
1822 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1823 | struct ieee80211_tx_info *info; |
1824 | ||
e32f85f7 LCC |
1825 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1826 | ||
1827 | if (!fwd_skb && net_ratelimit()) | |
1828 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1829 | sdata->name); |
919bbad5 | 1830 | if (!fwd_skb) |
b51aff05 | 1831 | goto out; |
e32f85f7 LCC |
1832 | |
1833 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1834 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1835 | info = IEEE80211_SKB_CB(fwd_skb); |
1836 | memset(info, 0, sizeof(*info)); | |
1837 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1838 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1839 | skb_set_queue_mapping(skb, |
1840 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1841 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1842 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1843 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1844 | fwded_mcast); | |
1845 | else { | |
3c5772a5 JC |
1846 | int err; |
1847 | /* | |
1848 | * Save TA to addr1 to send TA a path error if a | |
1849 | * suitable next hop is not found | |
1850 | */ | |
1851 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1852 | ETH_ALEN); |
3c5772a5 | 1853 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1854 | /* Failed to immediately resolve next hop: |
1855 | * fwded frame was dropped or will be added | |
1856 | * later to the pending skb queue. */ | |
1857 | if (err) | |
1858 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1859 | |
1860 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1861 | fwded_unicast); | |
249b405c JC |
1862 | } |
1863 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1864 | fwded_frames); | |
3b8d81e0 | 1865 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1866 | } |
1867 | } | |
1868 | ||
b51aff05 | 1869 | out: |
3c5772a5 | 1870 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1871 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1872 | return RX_CONTINUE; |
1873 | else | |
1874 | return RX_DROP_MONITOR; | |
1875 | } | |
bf94e17b | 1876 | #endif |
e32f85f7 | 1877 | |
49461622 | 1878 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1879 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1880 | { |
eb9fb5b8 | 1881 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1882 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1883 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1884 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1885 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1886 | int err; |
76ee65bf | 1887 | |
358c8d9d | 1888 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1889 | return RX_CONTINUE; |
76ee65bf | 1890 | |
358c8d9d | 1891 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1892 | return RX_DROP_MONITOR; |
76ee65bf | 1893 | |
f14543ee FF |
1894 | /* |
1895 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1896 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1897 | */ | |
1898 | if (ieee80211_has_a4(hdr->frame_control) && | |
1899 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1900 | return RX_DROP_MONITOR; | |
1901 | ||
e31a16d6 | 1902 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1903 | if (unlikely(err)) |
e4c26add | 1904 | return RX_DROP_UNUSABLE; |
76ee65bf | 1905 | |
358c8d9d | 1906 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1907 | return RX_DROP_MONITOR; |
ce3edf6d | 1908 | |
76ee65bf RR |
1909 | rx->skb->dev = dev; |
1910 | ||
1911 | dev->stats.rx_packets++; | |
1912 | dev->stats.rx_bytes += rx->skb->len; | |
1913 | ||
08ca944e HS |
1914 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
1915 | !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) { | |
e15276a4 VN |
1916 | mod_timer(&local->dynamic_ps_timer, jiffies + |
1917 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1918 | } | |
1919 | ||
76ee65bf | 1920 | ieee80211_deliver_skb(rx); |
571ecf67 | 1921 | |
9ae54c84 | 1922 | return RX_QUEUED; |
571ecf67 JB |
1923 | } |
1924 | ||
49461622 | 1925 | static ieee80211_rx_result debug_noinline |
24a8fdad | 1926 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1927 | { |
1928 | struct ieee80211_local *local = rx->local; | |
1929 | struct ieee80211_hw *hw = &local->hw; | |
1930 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1931 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1932 | struct tid_ampdu_rx *tid_agg_rx; |
1933 | u16 start_seq_num; | |
1934 | u16 tid; | |
1935 | ||
a7767f95 | 1936 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1937 | return RX_CONTINUE; |
71364716 | 1938 | |
a7767f95 | 1939 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
1940 | struct { |
1941 | __le16 control, start_seq_num; | |
1942 | } __packed bar_data; | |
1943 | ||
71364716 | 1944 | if (!rx->sta) |
a02ae758 | 1945 | return RX_DROP_MONITOR; |
8ae5977f JB |
1946 | |
1947 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
1948 | &bar_data, sizeof(bar_data))) | |
1949 | return RX_DROP_MONITOR; | |
1950 | ||
8ae5977f | 1951 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
1952 | |
1953 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
1954 | if (!tid_agg_rx) | |
a02ae758 | 1955 | return RX_DROP_MONITOR; |
71364716 | 1956 | |
8ae5977f | 1957 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
1958 | |
1959 | /* reset session timer */ | |
20ad19d0 JB |
1960 | if (tid_agg_rx->timeout) |
1961 | mod_timer(&tid_agg_rx->session_timer, | |
1962 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1963 | |
dd318575 | 1964 | spin_lock(&tid_agg_rx->reorder_lock); |
a02ae758 | 1965 | /* release stored frames up to start of BAR */ |
24a8fdad | 1966 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); |
dd318575 JB |
1967 | spin_unlock(&tid_agg_rx->reorder_lock); |
1968 | ||
a02ae758 JB |
1969 | kfree_skb(skb); |
1970 | return RX_QUEUED; | |
71364716 RR |
1971 | } |
1972 | ||
08daecae JB |
1973 | /* |
1974 | * After this point, we only want management frames, | |
1975 | * so we can drop all remaining control frames to | |
1976 | * cooked monitor interfaces. | |
1977 | */ | |
1978 | return RX_DROP_MONITOR; | |
71364716 RR |
1979 | } |
1980 | ||
f4f727a6 JM |
1981 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1982 | struct ieee80211_mgmt *mgmt, | |
1983 | size_t len) | |
fea14732 JM |
1984 | { |
1985 | struct ieee80211_local *local = sdata->local; | |
1986 | struct sk_buff *skb; | |
1987 | struct ieee80211_mgmt *resp; | |
1988 | ||
47846c9b | 1989 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
1990 | /* Not to own unicast address */ |
1991 | return; | |
1992 | } | |
1993 | ||
46900298 JB |
1994 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1995 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1996 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1997 | return; |
1998 | } | |
1999 | ||
2000 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2001 | /* Too short SA Query request frame */ | |
2002 | return; | |
2003 | } | |
2004 | ||
2005 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2006 | if (skb == NULL) | |
2007 | return; | |
2008 | ||
2009 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2010 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2011 | memset(resp, 0, 24); | |
2012 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 2013 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 2014 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
2015 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2016 | IEEE80211_STYPE_ACTION); | |
2017 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2018 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2019 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2020 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2021 | mgmt->u.action.u.sa_query.trans_id, | |
2022 | WLAN_SA_QUERY_TR_ID_LEN); | |
2023 | ||
62ae67be | 2024 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
2025 | } |
2026 | ||
2e161f78 JB |
2027 | static ieee80211_rx_result debug_noinline |
2028 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2029 | { | |
2030 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
554891e6 | 2031 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2032 | |
2033 | /* | |
2034 | * From here on, look only at management frames. | |
2035 | * Data and control frames are already handled, | |
2036 | * and unknown (reserved) frames are useless. | |
2037 | */ | |
2038 | if (rx->skb->len < 24) | |
2039 | return RX_DROP_MONITOR; | |
2040 | ||
2041 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2042 | return RX_DROP_MONITOR; | |
2043 | ||
554891e6 | 2044 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
2e161f78 JB |
2045 | return RX_DROP_MONITOR; |
2046 | ||
2047 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2048 | return RX_DROP_UNUSABLE; | |
2049 | ||
2050 | return RX_CONTINUE; | |
2051 | } | |
2052 | ||
de1ede7a JB |
2053 | static ieee80211_rx_result debug_noinline |
2054 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2055 | { | |
2056 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 2057 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 2058 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
554891e6 | 2059 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
de1ede7a JB |
2060 | int len = rx->skb->len; |
2061 | ||
2062 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2063 | return RX_CONTINUE; | |
2064 | ||
026331c4 JM |
2065 | /* drop too small frames */ |
2066 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 2067 | return RX_DROP_UNUSABLE; |
de1ede7a | 2068 | |
026331c4 | 2069 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 2070 | return RX_DROP_UNUSABLE; |
de1ede7a | 2071 | |
554891e6 | 2072 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 2073 | return RX_DROP_UNUSABLE; |
97ebe12a | 2074 | |
de1ede7a JB |
2075 | switch (mgmt->u.action.category) { |
2076 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
2077 | /* |
2078 | * The aggregation code is not prepared to handle | |
2079 | * anything but STA/AP due to the BSSID handling; | |
2080 | * IBSS could work in the code but isn't supported | |
2081 | * by drivers or the standard. | |
2082 | */ | |
2083 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2084 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2085 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 2086 | break; |
8abd3f9b | 2087 | |
026331c4 JM |
2088 | /* verify action_code is present */ |
2089 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2090 | break; | |
2091 | ||
de1ede7a JB |
2092 | switch (mgmt->u.action.u.addba_req.action_code) { |
2093 | case WLAN_ACTION_ADDBA_REQ: | |
2094 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2095 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
2096 | goto invalid; |
2097 | break; | |
de1ede7a JB |
2098 | case WLAN_ACTION_ADDBA_RESP: |
2099 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2100 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
2101 | goto invalid; |
2102 | break; | |
de1ede7a JB |
2103 | case WLAN_ACTION_DELBA: |
2104 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2105 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
2106 | goto invalid; |
2107 | break; | |
2108 | default: | |
2109 | goto invalid; | |
de1ede7a | 2110 | } |
bed7ee6e | 2111 | |
8b58ff83 | 2112 | goto queue; |
39192c0b JB |
2113 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2114 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2115 | break; |
46900298 JB |
2116 | |
2117 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2118 | break; |
46900298 | 2119 | |
026331c4 JM |
2120 | /* verify action_code is present */ |
2121 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2122 | break; | |
2123 | ||
39192c0b JB |
2124 | switch (mgmt->u.action.u.measurement.action_code) { |
2125 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2126 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2127 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2128 | break; |
39192c0b | 2129 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2130 | goto handled; |
c481ec97 S |
2131 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2132 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2133 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2134 | break; |
c481ec97 | 2135 | |
cc32abd4 | 2136 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2137 | break; |
cc32abd4 | 2138 | |
46900298 | 2139 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2140 | break; |
c481ec97 | 2141 | |
8b58ff83 | 2142 | goto queue; |
39192c0b JB |
2143 | } |
2144 | break; | |
fea14732 JM |
2145 | case WLAN_CATEGORY_SA_QUERY: |
2146 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2147 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2148 | break; |
2149 | ||
fea14732 JM |
2150 | switch (mgmt->u.action.u.sa_query.action) { |
2151 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2152 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2153 | break; |
fea14732 | 2154 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2155 | goto handled; |
fea14732 JM |
2156 | } |
2157 | break; | |
97ad9139 | 2158 | case WLAN_CATEGORY_MESH_PLINK: |
77a121c3 JB |
2159 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2160 | break; | |
8b58ff83 | 2161 | goto queue; |
c7108a71 JC |
2162 | case WLAN_CATEGORY_MESH_PATH_SEL: |
2163 | if (!mesh_path_sel_is_hwmp(sdata)) | |
2164 | break; | |
2165 | goto queue; | |
84040805 | 2166 | } |
026331c4 | 2167 | |
2e161f78 JB |
2168 | return RX_CONTINUE; |
2169 | ||
bed7ee6e | 2170 | invalid: |
554891e6 | 2171 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
2e161f78 JB |
2172 | /* will return in the next handlers */ |
2173 | return RX_CONTINUE; | |
2174 | ||
2175 | handled: | |
2176 | if (rx->sta) | |
2177 | rx->sta->rx_packets++; | |
2178 | dev_kfree_skb(rx->skb); | |
2179 | return RX_QUEUED; | |
2180 | ||
2181 | queue: | |
2182 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2183 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2184 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2185 | if (rx->sta) | |
2186 | rx->sta->rx_packets++; | |
2187 | return RX_QUEUED; | |
2188 | } | |
2189 | ||
2190 | static ieee80211_rx_result debug_noinline | |
2191 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2192 | { | |
554891e6 | 2193 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2194 | |
2195 | /* skip known-bad action frames and return them in the next handler */ | |
554891e6 | 2196 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
2e161f78 | 2197 | return RX_CONTINUE; |
d7907448 | 2198 | |
026331c4 JM |
2199 | /* |
2200 | * Getting here means the kernel doesn't know how to handle | |
2201 | * it, but maybe userspace does ... include returned frames | |
2202 | * so userspace can register for those to know whether ones | |
2203 | * it transmitted were processed or returned. | |
2204 | */ | |
026331c4 | 2205 | |
2e161f78 JB |
2206 | if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, |
2207 | rx->skb->data, rx->skb->len, | |
2208 | GFP_ATOMIC)) { | |
2209 | if (rx->sta) | |
2210 | rx->sta->rx_packets++; | |
2211 | dev_kfree_skb(rx->skb); | |
2212 | return RX_QUEUED; | |
2213 | } | |
2214 | ||
2215 | ||
2216 | return RX_CONTINUE; | |
2217 | } | |
2218 | ||
2219 | static ieee80211_rx_result debug_noinline | |
2220 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2221 | { | |
2222 | struct ieee80211_local *local = rx->local; | |
2223 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2224 | struct sk_buff *nskb; | |
2225 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
554891e6 | 2226 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2227 | |
2228 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2229 | return RX_CONTINUE; | |
2230 | ||
2231 | /* | |
2232 | * For AP mode, hostapd is responsible for handling any action | |
2233 | * frames that we didn't handle, including returning unknown | |
2234 | * ones. For all other modes we will return them to the sender, | |
2235 | * setting the 0x80 bit in the action category, as required by | |
2236 | * 802.11-2007 7.3.1.11. | |
2237 | * Newer versions of hostapd shall also use the management frame | |
2238 | * registration mechanisms, but older ones still use cooked | |
2239 | * monitor interfaces so push all frames there. | |
2240 | */ | |
554891e6 | 2241 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
2e161f78 JB |
2242 | (sdata->vif.type == NL80211_IFTYPE_AP || |
2243 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2244 | return RX_DROP_MONITOR; | |
026331c4 | 2245 | |
84040805 JB |
2246 | /* do not return rejected action frames */ |
2247 | if (mgmt->u.action.category & 0x80) | |
2248 | return RX_DROP_UNUSABLE; | |
2249 | ||
2250 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2251 | GFP_ATOMIC); | |
2252 | if (nskb) { | |
292b4df6 | 2253 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2254 | |
292b4df6 JL |
2255 | nmgmt->u.action.category |= 0x80; |
2256 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2257 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2258 | |
2259 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2260 | ||
2261 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a | 2262 | } |
39192c0b JB |
2263 | dev_kfree_skb(rx->skb); |
2264 | return RX_QUEUED; | |
de1ede7a JB |
2265 | } |
2266 | ||
49461622 | 2267 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2268 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2269 | { |
eb9fb5b8 | 2270 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2271 | ieee80211_rx_result rxs; |
77a121c3 JB |
2272 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2273 | __le16 stype; | |
571ecf67 | 2274 | |
af6b6374 JB |
2275 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2276 | if (rxs != RX_CONTINUE) | |
2277 | return rxs; | |
2278 | ||
77a121c3 | 2279 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2280 | |
77a121c3 JB |
2281 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2282 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2283 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2284 | return RX_DROP_MONITOR; | |
472dbc45 | 2285 | |
77a121c3 JB |
2286 | switch (stype) { |
2287 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2288 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2289 | /* process for all: mesh, mlme, ibss */ | |
2290 | break; | |
2291 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2292 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2c31333a CL |
2293 | if (is_multicast_ether_addr(mgmt->da) && |
2294 | !is_broadcast_ether_addr(mgmt->da)) | |
2295 | return RX_DROP_MONITOR; | |
2296 | ||
77a121c3 JB |
2297 | /* process only for station */ |
2298 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2299 | return RX_DROP_MONITOR; | |
2300 | break; | |
2301 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2302 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2303 | /* process only for ibss */ | |
2304 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2305 | return RX_DROP_MONITOR; | |
2306 | break; | |
2307 | default: | |
2308 | return RX_DROP_MONITOR; | |
2309 | } | |
f9d540ee | 2310 | |
77a121c3 | 2311 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2312 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2313 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2314 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2315 | if (rx->sta) |
2316 | rx->sta->rx_packets++; | |
46900298 | 2317 | |
77a121c3 | 2318 | return RX_QUEUED; |
571ecf67 JB |
2319 | } |
2320 | ||
3b8d81e0 | 2321 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2322 | struct ieee80211_rx_data *rx) |
571ecf67 | 2323 | { |
a7767f95 HH |
2324 | int keyidx; |
2325 | unsigned int hdrlen; | |
571ecf67 | 2326 | |
a7767f95 | 2327 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2328 | if (rx->skb->len >= hdrlen + 4) |
2329 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2330 | else | |
2331 | keyidx = -1; | |
2332 | ||
8944b79f | 2333 | if (!rx->sta) { |
aa0daf0e JB |
2334 | /* |
2335 | * Some hardware seem to generate incorrect Michael MIC | |
2336 | * reports; ignore them to avoid triggering countermeasures. | |
2337 | */ | |
af2ced6a | 2338 | return; |
571ecf67 JB |
2339 | } |
2340 | ||
a7767f95 | 2341 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2342 | return; |
571ecf67 | 2343 | |
05c914fe | 2344 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2345 | /* |
2346 | * APs with pairwise keys should never receive Michael MIC | |
2347 | * errors for non-zero keyidx because these are reserved for | |
2348 | * group keys and only the AP is sending real multicast | |
2349 | * frames in the BSS. | |
2350 | */ | |
af2ced6a | 2351 | return; |
571ecf67 JB |
2352 | } |
2353 | ||
a7767f95 HH |
2354 | if (!ieee80211_is_data(hdr->frame_control) && |
2355 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2356 | return; |
571ecf67 | 2357 | |
e6d6e342 JB |
2358 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2359 | GFP_ATOMIC); | |
571ecf67 JB |
2360 | } |
2361 | ||
5cf121c3 | 2362 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2363 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2364 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2365 | { |
2366 | struct ieee80211_sub_if_data *sdata; | |
2367 | struct ieee80211_local *local = rx->local; | |
2368 | struct ieee80211_rtap_hdr { | |
2369 | struct ieee80211_radiotap_header hdr; | |
2370 | u8 flags; | |
5f0b7de5 | 2371 | u8 rate_or_pad; |
3d30d949 MW |
2372 | __le16 chan_freq; |
2373 | __le16 chan_flags; | |
bc10502d | 2374 | } __packed *rthdr; |
3d30d949 MW |
2375 | struct sk_buff *skb = rx->skb, *skb2; |
2376 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2377 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2378 | |
554891e6 JB |
2379 | /* |
2380 | * If cooked monitor has been processed already, then | |
2381 | * don't do it again. If not, set the flag. | |
2382 | */ | |
2383 | if (rx->flags & IEEE80211_RX_CMNTR) | |
7c1e1831 | 2384 | goto out_free_skb; |
554891e6 | 2385 | rx->flags |= IEEE80211_RX_CMNTR; |
7c1e1831 | 2386 | |
3d30d949 MW |
2387 | if (skb_headroom(skb) < sizeof(*rthdr) && |
2388 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2389 | goto out_free_skb; | |
2390 | ||
2391 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2392 | memset(rthdr, 0, sizeof(*rthdr)); | |
2393 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2394 | rthdr->hdr.it_present = | |
2395 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2396 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2397 | ||
5f0b7de5 JB |
2398 | if (rate) { |
2399 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2400 | rthdr->hdr.it_present |= | |
2401 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2402 | } | |
3d30d949 MW |
2403 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2404 | ||
2405 | if (status->band == IEEE80211_BAND_5GHZ) | |
2406 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2407 | IEEE80211_CHAN_5GHZ); | |
2408 | else | |
2409 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2410 | IEEE80211_CHAN_2GHZ); | |
2411 | ||
2412 | skb_set_mac_header(skb, 0); | |
2413 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2414 | skb->pkt_type = PACKET_OTHERHOST; | |
2415 | skb->protocol = htons(ETH_P_802_2); | |
2416 | ||
2417 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2418 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2419 | continue; |
2420 | ||
05c914fe | 2421 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2422 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2423 | continue; | |
2424 | ||
2425 | if (prev_dev) { | |
2426 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2427 | if (skb2) { | |
2428 | skb2->dev = prev_dev; | |
5548a8a1 | 2429 | netif_receive_skb(skb2); |
3d30d949 MW |
2430 | } |
2431 | } | |
2432 | ||
2433 | prev_dev = sdata->dev; | |
2434 | sdata->dev->stats.rx_packets++; | |
2435 | sdata->dev->stats.rx_bytes += skb->len; | |
2436 | } | |
2437 | ||
2438 | if (prev_dev) { | |
2439 | skb->dev = prev_dev; | |
5548a8a1 | 2440 | netif_receive_skb(skb); |
554891e6 JB |
2441 | return; |
2442 | } | |
3d30d949 MW |
2443 | |
2444 | out_free_skb: | |
2445 | dev_kfree_skb(skb); | |
2446 | } | |
2447 | ||
aa0c8636 CL |
2448 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2449 | ieee80211_rx_result res) | |
2450 | { | |
2451 | switch (res) { | |
2452 | case RX_DROP_MONITOR: | |
2453 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2454 | if (rx->sta) | |
2455 | rx->sta->rx_dropped++; | |
2456 | /* fall through */ | |
2457 | case RX_CONTINUE: { | |
2458 | struct ieee80211_rate *rate = NULL; | |
2459 | struct ieee80211_supported_band *sband; | |
2460 | struct ieee80211_rx_status *status; | |
2461 | ||
2462 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2463 | ||
2464 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2465 | if (!(status->flag & RX_FLAG_HT)) | |
2466 | rate = &sband->bitrates[status->rate_idx]; | |
2467 | ||
2468 | ieee80211_rx_cooked_monitor(rx, rate); | |
2469 | break; | |
2470 | } | |
2471 | case RX_DROP_UNUSABLE: | |
2472 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2473 | if (rx->sta) | |
2474 | rx->sta->rx_dropped++; | |
2475 | dev_kfree_skb(rx->skb); | |
2476 | break; | |
2477 | case RX_QUEUED: | |
2478 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2479 | break; | |
2480 | } | |
2481 | } | |
571ecf67 | 2482 | |
24a8fdad | 2483 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) |
58905290 | 2484 | { |
58905290 | 2485 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2486 | struct sk_buff *skb; |
8944b79f | 2487 | |
e32f85f7 LCC |
2488 | #define CALL_RXH(rxh) \ |
2489 | do { \ | |
2490 | res = rxh(rx); \ | |
2491 | if (res != RX_CONTINUE) \ | |
2569a826 | 2492 | goto rxh_next; \ |
e32f85f7 | 2493 | } while (0); |
49461622 | 2494 | |
24a8fdad CL |
2495 | spin_lock(&rx->local->rx_skb_queue.lock); |
2496 | if (rx->local->running_rx_handler) | |
2497 | goto unlock; | |
2498 | ||
2499 | rx->local->running_rx_handler = true; | |
2500 | ||
2501 | while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { | |
2502 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2503 | ||
2569a826 JB |
2504 | /* |
2505 | * all the other fields are valid across frames | |
2506 | * that belong to an aMPDU since they are on the | |
2507 | * same TID from the same station | |
2508 | */ | |
2509 | rx->skb = skb; | |
554891e6 | 2510 | rx->flags = 0; |
2569a826 JB |
2511 | |
2512 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2513 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2514 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2515 | CALL_RXH(ieee80211_rx_h_defragment) | |
2516 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2517 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2518 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2519 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2520 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2521 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2522 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2523 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2524 | #endif |
2569a826 | 2525 | CALL_RXH(ieee80211_rx_h_data) |
24a8fdad | 2526 | CALL_RXH(ieee80211_rx_h_ctrl); |
2e161f78 | 2527 | CALL_RXH(ieee80211_rx_h_mgmt_check) |
2569a826 | 2528 | CALL_RXH(ieee80211_rx_h_action) |
2e161f78 JB |
2529 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) |
2530 | CALL_RXH(ieee80211_rx_h_action_return) | |
2569a826 | 2531 | CALL_RXH(ieee80211_rx_h_mgmt) |
49461622 | 2532 | |
aa0c8636 CL |
2533 | rxh_next: |
2534 | ieee80211_rx_handlers_result(rx, res); | |
24a8fdad | 2535 | spin_lock(&rx->local->rx_skb_queue.lock); |
49461622 | 2536 | #undef CALL_RXH |
aa0c8636 | 2537 | } |
24a8fdad CL |
2538 | |
2539 | rx->local->running_rx_handler = false; | |
2540 | ||
2541 | unlock: | |
2542 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
aa0c8636 CL |
2543 | } |
2544 | ||
4406c376 | 2545 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
aa0c8636 | 2546 | { |
aa0c8636 CL |
2547 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2548 | ||
aa0c8636 CL |
2549 | #define CALL_RXH(rxh) \ |
2550 | do { \ | |
2551 | res = rxh(rx); \ | |
2552 | if (res != RX_CONTINUE) \ | |
2553 | goto rxh_next; \ | |
2554 | } while (0); | |
2555 | ||
2556 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2557 | CALL_RXH(ieee80211_rx_h_check) | |
2558 | ||
24a8fdad | 2559 | ieee80211_rx_reorder_ampdu(rx); |
aa0c8636 | 2560 | |
24a8fdad | 2561 | ieee80211_rx_handlers(rx); |
aa0c8636 | 2562 | return; |
49461622 | 2563 | |
2569a826 | 2564 | rxh_next: |
aa0c8636 CL |
2565 | ieee80211_rx_handlers_result(rx, res); |
2566 | ||
2567 | #undef CALL_RXH | |
58905290 JB |
2568 | } |
2569 | ||
2bff8ebf | 2570 | /* |
dd318575 JB |
2571 | * This function makes calls into the RX path, therefore |
2572 | * it has to be invoked under RCU read lock. | |
2bff8ebf CL |
2573 | */ |
2574 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2575 | { | |
554891e6 JB |
2576 | struct ieee80211_rx_data rx = { |
2577 | .sta = sta, | |
2578 | .sdata = sta->sdata, | |
2579 | .local = sta->local, | |
2580 | .queue = tid, | |
2581 | }; | |
2c15a0cf CL |
2582 | struct tid_ampdu_rx *tid_agg_rx; |
2583 | ||
2584 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2585 | if (!tid_agg_rx) | |
2586 | return; | |
2bff8ebf | 2587 | |
2c15a0cf | 2588 | spin_lock(&tid_agg_rx->reorder_lock); |
24a8fdad | 2589 | ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); |
2c15a0cf | 2590 | spin_unlock(&tid_agg_rx->reorder_lock); |
2bff8ebf | 2591 | |
24a8fdad | 2592 | ieee80211_rx_handlers(&rx); |
2bff8ebf CL |
2593 | } |
2594 | ||
571ecf67 JB |
2595 | /* main receive path */ |
2596 | ||
20b01f80 | 2597 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
23a24def JB |
2598 | struct ieee80211_hdr *hdr) |
2599 | { | |
20b01f80 | 2600 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
eb9fb5b8 JB |
2601 | struct sk_buff *skb = rx->skb; |
2602 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2603 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2604 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2605 | ||
51fb61e7 | 2606 | switch (sdata->vif.type) { |
05c914fe | 2607 | case NL80211_IFTYPE_STATION: |
9bc383de | 2608 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2609 | return 0; |
77fdaa12 | 2610 | if (!multicast && |
47846c9b | 2611 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2612 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2613 | return 0; |
554891e6 | 2614 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2615 | } |
2616 | break; | |
05c914fe | 2617 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2618 | if (!bssid) |
2619 | return 0; | |
a7767f95 | 2620 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2621 | return 1; |
87291c02 | 2622 | } |
46900298 | 2623 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
554891e6 | 2624 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2625 | return 0; |
554891e6 | 2626 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2627 | } else if (!multicast && |
47846c9b | 2628 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2629 | hdr->addr1) != 0) { |
4150c572 | 2630 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2631 | return 0; |
554891e6 | 2632 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2633 | } else if (!rx->sta) { |
2634 | int rate_idx; | |
eb9fb5b8 | 2635 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2636 | rate_idx = 0; /* TODO: HT rates */ |
2637 | else | |
eb9fb5b8 | 2638 | rate_idx = status->rate_idx; |
34e89507 JB |
2639 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2640 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2641 | } |
23a24def | 2642 | break; |
05c914fe | 2643 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2644 | if (!multicast && |
47846c9b | 2645 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2646 | hdr->addr1) != 0) { |
2647 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2648 | return 0; | |
2649 | ||
554891e6 | 2650 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2651 | } |
2652 | break; | |
05c914fe JB |
2653 | case NL80211_IFTYPE_AP_VLAN: |
2654 | case NL80211_IFTYPE_AP: | |
23a24def | 2655 | if (!bssid) { |
47846c9b | 2656 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2657 | hdr->addr1)) |
2658 | return 0; | |
2659 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2660 | sdata->vif.addr)) { |
554891e6 | 2661 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2662 | return 0; |
554891e6 | 2663 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2664 | } |
23a24def | 2665 | break; |
05c914fe | 2666 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2667 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2668 | return 0; |
2669 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2670 | return 0; | |
2671 | break; | |
2ca27bcf | 2672 | default: |
fb1c1cd6 JB |
2673 | /* should never get here */ |
2674 | WARN_ON(1); | |
2675 | break; | |
23a24def JB |
2676 | } |
2677 | ||
2678 | return 1; | |
2679 | } | |
2680 | ||
4406c376 JB |
2681 | /* |
2682 | * This function returns whether or not the SKB | |
2683 | * was destined for RX processing or not, which, | |
2684 | * if consume is true, is equivalent to whether | |
2685 | * or not the skb was consumed. | |
2686 | */ | |
2687 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2688 | struct sk_buff *skb, bool consume) | |
2689 | { | |
2690 | struct ieee80211_local *local = rx->local; | |
2691 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2692 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2693 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2694 | int prepares; | |
2695 | ||
2696 | rx->skb = skb; | |
554891e6 | 2697 | status->rx_flags |= IEEE80211_RX_RA_MATCH; |
4406c376 JB |
2698 | prepares = prepare_for_handlers(rx, hdr); |
2699 | ||
2700 | if (!prepares) | |
2701 | return false; | |
2702 | ||
2703 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
554891e6 | 2704 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) |
4406c376 JB |
2705 | ieee80211_rx_michael_mic_report(hdr, rx); |
2706 | return false; | |
2707 | } | |
2708 | ||
2709 | if (!consume) { | |
2710 | skb = skb_copy(skb, GFP_ATOMIC); | |
2711 | if (!skb) { | |
2712 | if (net_ratelimit()) | |
2713 | wiphy_debug(local->hw.wiphy, | |
b305dae4 | 2714 | "failed to copy skb for %s\n", |
4406c376 JB |
2715 | sdata->name); |
2716 | return true; | |
2717 | } | |
2718 | ||
2719 | rx->skb = skb; | |
2720 | } | |
2721 | ||
2722 | ieee80211_invoke_rx_handlers(rx); | |
2723 | return true; | |
2724 | } | |
2725 | ||
571ecf67 | 2726 | /* |
6368e4b1 RR |
2727 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2728 | * be called with rcu_read_lock protection. | |
571ecf67 | 2729 | */ |
71ebb4aa | 2730 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2731 | struct sk_buff *skb) |
571ecf67 | 2732 | { |
554891e6 | 2733 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2734 | struct ieee80211_local *local = hw_to_local(hw); |
2735 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2736 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2737 | __le16 fc; |
5cf121c3 | 2738 | struct ieee80211_rx_data rx; |
4406c376 | 2739 | struct ieee80211_sub_if_data *prev; |
56af3268 | 2740 | struct sta_info *sta, *tmp, *prev_sta; |
e3cf8b3f | 2741 | int err = 0; |
571ecf67 | 2742 | |
e3cf8b3f | 2743 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2744 | memset(&rx, 0, sizeof(rx)); |
2745 | rx.skb = skb; | |
2746 | rx.local = local; | |
72abd81b | 2747 | |
e3cf8b3f | 2748 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2749 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2750 | |
142b9f50 HS |
2751 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2752 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
554891e6 | 2753 | status->rx_flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2754 | |
e3cf8b3f ZY |
2755 | if (ieee80211_is_mgmt(fc)) |
2756 | err = skb_linearize(skb); | |
2757 | else | |
2758 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2759 | ||
2760 | if (err) { | |
2761 | dev_kfree_skb(skb); | |
2762 | return; | |
2763 | } | |
2764 | ||
2765 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2766 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2767 | ieee80211_verify_alignment(&rx); |
38f3714d | 2768 | |
e3cf8b3f | 2769 | if (ieee80211_is_data(fc)) { |
56af3268 | 2770 | prev_sta = NULL; |
4406c376 | 2771 | |
abe60632 | 2772 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
56af3268 BG |
2773 | if (!prev_sta) { |
2774 | prev_sta = sta; | |
2775 | continue; | |
2776 | } | |
2777 | ||
2778 | rx.sta = prev_sta; | |
2779 | rx.sdata = prev_sta->sdata; | |
4406c376 | 2780 | ieee80211_prepare_and_rx_handle(&rx, skb, false); |
abe60632 | 2781 | |
56af3268 | 2782 | prev_sta = sta; |
4406c376 | 2783 | } |
56af3268 BG |
2784 | |
2785 | if (prev_sta) { | |
2786 | rx.sta = prev_sta; | |
2787 | rx.sdata = prev_sta->sdata; | |
2788 | ||
4406c376 | 2789 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
56af3268 | 2790 | return; |
8e26d5ad | 2791 | goto out; |
56af3268 | 2792 | } |
4406c376 JB |
2793 | } |
2794 | ||
4b0dd98e | 2795 | prev = NULL; |
b2e7771e | 2796 | |
4b0dd98e JB |
2797 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2798 | if (!ieee80211_sdata_running(sdata)) | |
2799 | continue; | |
340e11f3 | 2800 | |
4b0dd98e JB |
2801 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2802 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2803 | continue; | |
340e11f3 | 2804 | |
4b0dd98e JB |
2805 | /* |
2806 | * frame is destined for this interface, but if it's | |
2807 | * not also for the previous one we handle that after | |
2808 | * the loop to avoid copying the SKB once too much | |
2809 | */ | |
4bb29f8c | 2810 | |
4b0dd98e | 2811 | if (!prev) { |
abe60632 | 2812 | prev = sdata; |
4b0dd98e | 2813 | continue; |
340e11f3 | 2814 | } |
4bb29f8c | 2815 | |
4b0dd98e JB |
2816 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
2817 | rx.sdata = prev; | |
2818 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
4bb29f8c | 2819 | |
4b0dd98e JB |
2820 | prev = sdata; |
2821 | } | |
2822 | ||
2823 | if (prev) { | |
2824 | rx.sta = sta_info_get_bss(prev, hdr->addr2); | |
2825 | rx.sdata = prev; | |
4406c376 | 2826 | |
4b0dd98e JB |
2827 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
2828 | return; | |
571ecf67 | 2829 | } |
4406c376 | 2830 | |
8e26d5ad | 2831 | out: |
4406c376 | 2832 | dev_kfree_skb(skb); |
571ecf67 | 2833 | } |
6368e4b1 RR |
2834 | |
2835 | /* | |
2836 | * This is the receive path handler. It is called by a low level driver when an | |
2837 | * 802.11 MPDU is received from the hardware. | |
2838 | */ | |
103bf9f7 | 2839 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2840 | { |
2841 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2842 | struct ieee80211_rate *rate = NULL; |
2843 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2844 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2845 | |
d20ef63d JB |
2846 | WARN_ON_ONCE(softirq_count() == 0); |
2847 | ||
77a980dc JB |
2848 | if (WARN_ON(status->band < 0 || |
2849 | status->band >= IEEE80211_NUM_BANDS)) | |
2850 | goto drop; | |
8318d78a JB |
2851 | |
2852 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2853 | if (WARN_ON(!sband)) |
2854 | goto drop; | |
8318d78a | 2855 | |
89c3a8ac JB |
2856 | /* |
2857 | * If we're suspending, it is possible although not too likely | |
2858 | * that we'd be receiving frames after having already partially | |
2859 | * quiesced the stack. We can't process such frames then since | |
2860 | * that might, for example, cause stations to be added or other | |
2861 | * driver callbacks be invoked. | |
2862 | */ | |
77a980dc JB |
2863 | if (unlikely(local->quiescing || local->suspended)) |
2864 | goto drop; | |
89c3a8ac | 2865 | |
ea77f12f JB |
2866 | /* |
2867 | * The same happens when we're not even started, | |
2868 | * but that's worth a warning. | |
2869 | */ | |
77a980dc JB |
2870 | if (WARN_ON(!local->started)) |
2871 | goto drop; | |
ea77f12f | 2872 | |
fc885189 | 2873 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 2874 | /* |
fc885189 JB |
2875 | * Validate the rate, unless a PLCP error means that |
2876 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 2877 | */ |
fc885189 JB |
2878 | |
2879 | if (status->flag & RX_FLAG_HT) { | |
2880 | /* | |
2881 | * rate_idx is MCS index, which can be [0-76] | |
2882 | * as documented on: | |
2883 | * | |
2884 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2885 | * | |
2886 | * Anything else would be some sort of driver or | |
2887 | * hardware error. The driver should catch hardware | |
2888 | * errors. | |
2889 | */ | |
2890 | if (WARN((status->rate_idx < 0 || | |
2891 | status->rate_idx > 76), | |
2892 | "Rate marked as an HT rate but passed " | |
2893 | "status->rate_idx is not " | |
2894 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2895 | status->rate_idx, | |
2896 | status->rate_idx)) | |
2897 | goto drop; | |
2898 | } else { | |
2899 | if (WARN_ON(status->rate_idx < 0 || | |
2900 | status->rate_idx >= sband->n_bitrates)) | |
2901 | goto drop; | |
2902 | rate = &sband->bitrates[status->rate_idx]; | |
2903 | } | |
0fb8ca45 | 2904 | } |
6368e4b1 | 2905 | |
554891e6 JB |
2906 | status->rx_flags = 0; |
2907 | ||
6368e4b1 RR |
2908 | /* |
2909 | * key references and virtual interfaces are protected using RCU | |
2910 | * and this requires that we are in a read-side RCU section during | |
2911 | * receive processing | |
2912 | */ | |
2913 | rcu_read_lock(); | |
2914 | ||
2915 | /* | |
2916 | * Frames with failed FCS/PLCP checksum are not returned, | |
2917 | * all other frames are returned without radiotap header | |
2918 | * if it was previously present. | |
2919 | * Also, frames with less than 16 bytes are dropped. | |
2920 | */ | |
f1d58c25 | 2921 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2922 | if (!skb) { |
2923 | rcu_read_unlock(); | |
2924 | return; | |
2925 | } | |
2926 | ||
e1e54068 JB |
2927 | ieee80211_tpt_led_trig_rx(local, |
2928 | ((struct ieee80211_hdr *)skb->data)->frame_control, | |
2929 | skb->len); | |
071d9ac2 | 2930 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
2931 | |
2932 | rcu_read_unlock(); | |
77a980dc JB |
2933 | |
2934 | return; | |
2935 | drop: | |
2936 | kfree_skb(skb); | |
6368e4b1 | 2937 | } |
103bf9f7 | 2938 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2939 | |
2940 | /* This is a version of the rx handler that can be called from hard irq | |
2941 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2942 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2943 | { |
2944 | struct ieee80211_local *local = hw_to_local(hw); | |
2945 | ||
2946 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2947 | ||
571ecf67 JB |
2948 | skb->pkt_type = IEEE80211_RX_MSG; |
2949 | skb_queue_tail(&local->skb_queue, skb); | |
2950 | tasklet_schedule(&local->tasklet); | |
2951 | } | |
2952 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |