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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, | |
2569a826 JB |
536 | int index, |
537 | struct sk_buff_head *frames) | |
1edfb1af | 538 | { |
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; | |
d29cecda | 552 | __skb_queue_tail(frames, 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, | |
2569a826 JB |
560 | u16 head_seq_num, |
561 | struct sk_buff_head *frames) | |
1edfb1af JB |
562 | { |
563 | int index; | |
564 | ||
dd318575 JB |
565 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
566 | ||
1edfb1af JB |
567 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
568 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
569 | tid_agg_rx->buf_size; | |
2569a826 | 570 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
571 | } |
572 | } | |
573 | ||
574 | /* | |
575 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
576 | * the skb was added to the buffer longer than this time ago, the earlier | |
577 | * frames that have not yet been received are assumed to be lost and the skb | |
578 | * can be released for processing. This may also release other skb's from the | |
579 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
580 | * |
581 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
582 | */ |
583 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
584 | ||
aa0c8636 CL |
585 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
586 | struct tid_ampdu_rx *tid_agg_rx, | |
587 | struct sk_buff_head *frames) | |
588 | { | |
2bff8ebf | 589 | int index, j; |
aa0c8636 | 590 | |
dd318575 JB |
591 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
592 | ||
aa0c8636 CL |
593 | /* release the buffer until next missing frame */ |
594 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
595 | tid_agg_rx->buf_size; | |
596 | if (!tid_agg_rx->reorder_buf[index] && | |
597 | tid_agg_rx->stored_mpdu_num > 1) { | |
598 | /* | |
599 | * No buffers ready to be released, but check whether any | |
600 | * frames in the reorder buffer have timed out. | |
601 | */ | |
aa0c8636 CL |
602 | int skipped = 1; |
603 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
604 | j = (j + 1) % tid_agg_rx->buf_size) { | |
605 | if (!tid_agg_rx->reorder_buf[j]) { | |
606 | skipped++; | |
607 | continue; | |
608 | } | |
609 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
610 | HT_RX_REORDER_BUF_TIMEOUT)) | |
2bff8ebf | 611 | goto set_release_timer; |
aa0c8636 CL |
612 | |
613 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
614 | if (net_ratelimit()) | |
0fb9a9ec JP |
615 | wiphy_debug(hw->wiphy, |
616 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
aa0c8636 CL |
617 | #endif |
618 | ieee80211_release_reorder_frame(hw, tid_agg_rx, | |
619 | j, frames); | |
620 | ||
621 | /* | |
622 | * Increment the head seq# also for the skipped slots. | |
623 | */ | |
624 | tid_agg_rx->head_seq_num = | |
625 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
626 | skipped = 0; | |
627 | } | |
628 | } else while (tid_agg_rx->reorder_buf[index]) { | |
629 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); | |
630 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
631 | tid_agg_rx->buf_size; | |
632 | } | |
2bff8ebf | 633 | |
15943a72 CL |
634 | /* |
635 | * Disable the reorder release timer for now. | |
636 | * | |
637 | * The current implementation lacks a proper locking scheme | |
638 | * which would protect vital statistic and debug counters | |
639 | * from being updated by two different but concurrent BHs. | |
640 | * | |
641 | * More information about the topic is available from: | |
642 | * - thread: http://marc.info/?t=128635927000001 | |
643 | * | |
644 | * What was wrong: | |
645 | * => http://marc.info/?l=linux-wireless&m=128636170811964 | |
646 | * "Basically the thing is that until your patch, the data | |
647 | * in the struct didn't actually need locking because it | |
648 | * was accessed by the RX path only which is not concurrent." | |
649 | * | |
650 | * List of what needs to be fixed: | |
651 | * => http://marc.info/?l=linux-wireless&m=128656352920957 | |
652 | * | |
653 | ||
2bff8ebf CL |
654 | if (tid_agg_rx->stored_mpdu_num) { |
655 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
656 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
657 | ||
658 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
659 | j = (j + 1) % tid_agg_rx->buf_size) { | |
660 | if (tid_agg_rx->reorder_buf[j]) | |
661 | break; | |
662 | } | |
663 | ||
664 | set_release_timer: | |
665 | ||
666 | mod_timer(&tid_agg_rx->reorder_timer, | |
667 | tid_agg_rx->reorder_time[j] + | |
668 | HT_RX_REORDER_BUF_TIMEOUT); | |
669 | } else { | |
670 | del_timer(&tid_agg_rx->reorder_timer); | |
671 | } | |
15943a72 CL |
672 | */ |
673 | ||
674 | set_release_timer: | |
675 | return; | |
aa0c8636 CL |
676 | } |
677 | ||
1edfb1af JB |
678 | /* |
679 | * As this function belongs to the RX path it must be under | |
680 | * rcu_read_lock protection. It returns false if the frame | |
681 | * can be processed immediately, true if it was consumed. | |
682 | */ | |
683 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
684 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
685 | struct sk_buff *skb, |
686 | struct sk_buff_head *frames) | |
1edfb1af JB |
687 | { |
688 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
689 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
690 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
691 | u16 head_seq_num, buf_size; | |
692 | int index; | |
2bff8ebf | 693 | bool ret = true; |
1edfb1af | 694 | |
dd318575 JB |
695 | spin_lock(&tid_agg_rx->reorder_lock); |
696 | ||
1edfb1af JB |
697 | buf_size = tid_agg_rx->buf_size; |
698 | head_seq_num = tid_agg_rx->head_seq_num; | |
699 | ||
700 | /* frame with out of date sequence number */ | |
701 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
702 | dev_kfree_skb(skb); | |
2bff8ebf | 703 | goto out; |
1edfb1af JB |
704 | } |
705 | ||
706 | /* | |
707 | * If frame the sequence number exceeds our buffering window | |
708 | * size release some previous frames to make room for this one. | |
709 | */ | |
710 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
711 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
712 | /* release stored frames up to new head to stack */ | |
2569a826 JB |
713 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
714 | frames); | |
1edfb1af JB |
715 | } |
716 | ||
717 | /* Now the new frame is always in the range of the reordering buffer */ | |
718 | ||
719 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
720 | ||
721 | /* check if we already stored this frame */ | |
722 | if (tid_agg_rx->reorder_buf[index]) { | |
723 | dev_kfree_skb(skb); | |
2bff8ebf | 724 | goto out; |
1edfb1af JB |
725 | } |
726 | ||
727 | /* | |
728 | * If the current MPDU is in the right order and nothing else | |
729 | * is stored we can process it directly, no need to buffer it. | |
730 | */ | |
731 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
732 | tid_agg_rx->stored_mpdu_num == 0) { | |
733 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
734 | ret = false; |
735 | goto out; | |
1edfb1af JB |
736 | } |
737 | ||
738 | /* put the frame in the reordering buffer */ | |
739 | tid_agg_rx->reorder_buf[index] = skb; | |
740 | tid_agg_rx->reorder_time[index] = jiffies; | |
741 | tid_agg_rx->stored_mpdu_num++; | |
aa0c8636 | 742 | ieee80211_sta_reorder_release(hw, tid_agg_rx, frames); |
1edfb1af | 743 | |
2bff8ebf CL |
744 | out: |
745 | spin_unlock(&tid_agg_rx->reorder_lock); | |
746 | return ret; | |
1edfb1af JB |
747 | } |
748 | ||
749 | /* | |
750 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
751 | * true if the MPDU was buffered, false if it should be processed. | |
752 | */ | |
2569a826 JB |
753 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
754 | struct sk_buff_head *frames) | |
1edfb1af | 755 | { |
2569a826 JB |
756 | struct sk_buff *skb = rx->skb; |
757 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
758 | struct ieee80211_hw *hw = &local->hw; |
759 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 760 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
761 | struct tid_ampdu_rx *tid_agg_rx; |
762 | u16 sc; | |
763 | int tid; | |
764 | ||
765 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 766 | goto dont_reorder; |
1edfb1af JB |
767 | |
768 | /* | |
769 | * filter the QoS data rx stream according to | |
770 | * STA/TID and check if this STA/TID is on aggregation | |
771 | */ | |
772 | ||
1edfb1af | 773 | if (!sta) |
2569a826 | 774 | goto dont_reorder; |
1edfb1af JB |
775 | |
776 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
777 | ||
a87f736d JB |
778 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
779 | if (!tid_agg_rx) | |
780 | goto dont_reorder; | |
1edfb1af JB |
781 | |
782 | /* qos null data frames are excluded */ | |
783 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 784 | goto dont_reorder; |
1edfb1af JB |
785 | |
786 | /* new, potentially un-ordered, ampdu frame - process it */ | |
787 | ||
788 | /* reset session timer */ | |
789 | if (tid_agg_rx->timeout) | |
790 | mod_timer(&tid_agg_rx->session_timer, | |
791 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
792 | ||
793 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
794 | sc = le16_to_cpu(hdr->seq_ctrl); | |
795 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 796 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
797 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
798 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 799 | return; |
1edfb1af JB |
800 | } |
801 | ||
a87f736d JB |
802 | /* |
803 | * No locking needed -- we will only ever process one | |
804 | * RX packet at a time, and thus own tid_agg_rx. All | |
805 | * other code manipulating it needs to (and does) make | |
806 | * sure that we cannot get to it any more before doing | |
807 | * anything with it. | |
808 | */ | |
809 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) | |
2569a826 JB |
810 | return; |
811 | ||
812 | dont_reorder: | |
813 | __skb_queue_tail(frames, skb); | |
1edfb1af | 814 | } |
33b64eb2 | 815 | |
49461622 | 816 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 817 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 818 | { |
a7767f95 | 819 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 820 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
821 | |
822 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
823 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 824 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 825 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 826 | hdr->seq_ctrl)) { |
554891e6 | 827 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
828 | rx->local->dot11FrameDuplicateCount++; |
829 | rx->sta->num_duplicates++; | |
830 | } | |
e4c26add | 831 | return RX_DROP_MONITOR; |
571ecf67 | 832 | } else |
5cf121c3 | 833 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
834 | } |
835 | ||
571ecf67 JB |
836 | if (unlikely(rx->skb->len < 16)) { |
837 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 838 | return RX_DROP_MONITOR; |
571ecf67 JB |
839 | } |
840 | ||
571ecf67 JB |
841 | /* Drop disallowed frame classes based on STA auth/assoc state; |
842 | * IEEE 802.11, Chap 5.5. | |
843 | * | |
ccd7b362 JB |
844 | * mac80211 filters only based on association state, i.e. it drops |
845 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
846 | * deauth/disassoc frames when needed. In addition, hostapd is |
847 | * responsible for filtering on both auth and assoc states. | |
848 | */ | |
33b64eb2 | 849 | |
902acc78 | 850 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 851 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 852 | |
a7767f95 HH |
853 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
854 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 855 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
1be7fe8d | 856 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && |
07346f81 | 857 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
858 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
859 | !ieee80211_has_tods(hdr->frame_control) && | |
860 | ieee80211_is_data(hdr->frame_control)) || | |
554891e6 | 861 | !(status->rx_flags & IEEE80211_RX_RA_MATCH)) { |
571ecf67 JB |
862 | /* Drop IBSS frames and frames for other hosts |
863 | * silently. */ | |
e4c26add | 864 | return RX_DROP_MONITOR; |
571ecf67 JB |
865 | } |
866 | ||
e4c26add | 867 | return RX_DROP_MONITOR; |
571ecf67 JB |
868 | } |
869 | ||
9ae54c84 | 870 | return RX_CONTINUE; |
570bd537 JB |
871 | } |
872 | ||
873 | ||
49461622 | 874 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 875 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 876 | { |
eb9fb5b8 JB |
877 | struct sk_buff *skb = rx->skb; |
878 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
879 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
880 | int keyidx; |
881 | int hdrlen; | |
e4c26add | 882 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
e31b8213 | 883 | struct ieee80211_key *sta_ptk = NULL; |
3cfcf6ac | 884 | int mmie_keyidx = -1; |
761ab470 | 885 | __le16 fc; |
570bd537 | 886 | |
3017b80b JB |
887 | /* |
888 | * Key selection 101 | |
889 | * | |
3cfcf6ac | 890 | * There are four types of keys: |
3017b80b | 891 | * - GTK (group keys) |
3cfcf6ac | 892 | * - IGTK (group keys for management frames) |
3017b80b JB |
893 | * - PTK (pairwise keys) |
894 | * - STK (station-to-station pairwise keys) | |
895 | * | |
896 | * When selecting a key, we have to distinguish between multicast | |
897 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
898 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
899 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
900 | * unicast frames can also use key indices like GTKs. Hence, if we | |
901 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 902 | * |
8dc06a1c JB |
903 | * Note that in a regular BSS, multicast frames are sent by the |
904 | * AP only, associated stations unicast the frame to the AP first | |
905 | * which then multicasts it on their behalf. | |
906 | * | |
3017b80b JB |
907 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
908 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
909 | * The spec seems to expect that one negotiates the same key with |
910 | * every station but there's no such requirement; VLANs could be | |
911 | * possible. | |
3017b80b JB |
912 | */ |
913 | ||
3017b80b | 914 | /* |
1990af8d | 915 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
916 | * addressed to us nor a multicast frame. |
917 | */ | |
554891e6 | 918 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 919 | return RX_CONTINUE; |
3017b80b | 920 | |
2569a826 JB |
921 | /* start without a key */ |
922 | rx->key = NULL; | |
923 | ||
d4e46a3d | 924 | if (rx->sta) |
e31b8213 | 925 | sta_ptk = rcu_dereference(rx->sta->ptk); |
d4e46a3d | 926 | |
761ab470 JB |
927 | fc = hdr->frame_control; |
928 | ||
929 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
930 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
931 | ||
e31b8213 JB |
932 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
933 | rx->key = sta_ptk; | |
dc1580dd JB |
934 | if ((status->flag & RX_FLAG_DECRYPTED) && |
935 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
936 | return RX_CONTINUE; | |
0c7c10c7 | 937 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 938 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 939 | return RX_CONTINUE; |
3cfcf6ac JM |
940 | } else if (mmie_keyidx >= 0) { |
941 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
942 | if ((status->flag & RX_FLAG_DECRYPTED) && |
943 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
944 | return RX_CONTINUE; |
945 | ||
946 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
947 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
948 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
e31b8213 JB |
949 | if (rx->sta) |
950 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
951 | if (!rx->key) | |
952 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 953 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
954 | /* |
955 | * The frame was not protected, so skip decryption. However, we | |
956 | * need to set rx->key if there is a key that could have been | |
957 | * used so that the frame may be dropped if encryption would | |
958 | * have been expected. | |
959 | */ | |
960 | struct ieee80211_key *key = NULL; | |
897bed8b JB |
961 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
962 | int i; | |
963 | ||
761ab470 | 964 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
965 | is_multicast_ether_addr(hdr->addr1) && |
966 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
967 | rx->key = key; | |
897bed8b JB |
968 | else { |
969 | if (rx->sta) { | |
970 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
971 | key = rcu_dereference(rx->sta->gtk[i]); | |
972 | if (key) | |
973 | break; | |
974 | } | |
975 | } | |
976 | if (!key) { | |
977 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
978 | key = rcu_dereference(sdata->keys[i]); | |
979 | if (key) | |
980 | break; | |
981 | } | |
982 | } | |
983 | if (key) | |
984 | rx->key = key; | |
985 | } | |
0c7c10c7 | 986 | return RX_CONTINUE; |
571ecf67 | 987 | } else { |
39184b15 | 988 | u8 keyid; |
3017b80b JB |
989 | /* |
990 | * The device doesn't give us the IV so we won't be | |
991 | * able to look up the key. That's ok though, we | |
992 | * don't need to decrypt the frame, we just won't | |
993 | * be able to keep statistics accurate. | |
994 | * Except for key threshold notifications, should | |
995 | * we somehow allow the driver to tell us which key | |
996 | * the hardware used if this flag is set? | |
997 | */ | |
eb9fb5b8 JB |
998 | if ((status->flag & RX_FLAG_DECRYPTED) && |
999 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 1000 | return RX_CONTINUE; |
3017b80b | 1001 | |
761ab470 | 1002 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
1003 | |
1004 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 1005 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
1006 | |
1007 | /* | |
1008 | * no need to call ieee80211_wep_get_keyidx, | |
1009 | * it verifies a bunch of things we've done already | |
1010 | */ | |
39184b15 ZY |
1011 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
1012 | keyidx = keyid >> 6; | |
3017b80b | 1013 | |
e31b8213 JB |
1014 | /* check per-station GTK first, if multicast packet */ |
1015 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
1016 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
3017b80b | 1017 | |
e31b8213 JB |
1018 | /* if not found, try default key */ |
1019 | if (!rx->key) { | |
1020 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
1021 | ||
1022 | /* | |
1023 | * RSNA-protected unicast frames should always be | |
1024 | * sent with pairwise or station-to-station keys, | |
1025 | * but for WEP we allow using a key index as well. | |
1026 | */ | |
1027 | if (rx->key && | |
1028 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
1029 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1030 | !is_multicast_ether_addr(hdr->addr1)) | |
1031 | rx->key = NULL; | |
1032 | } | |
571ecf67 JB |
1033 | } |
1034 | ||
3017b80b | 1035 | if (rx->key) { |
571ecf67 | 1036 | rx->key->tx_rx_count++; |
011bfcc4 | 1037 | /* TODO: add threshold stuff again */ |
1990af8d | 1038 | } else { |
e4c26add | 1039 | return RX_DROP_MONITOR; |
70f08765 JB |
1040 | } |
1041 | ||
39184b15 ZY |
1042 | if (skb_linearize(rx->skb)) |
1043 | return RX_DROP_UNUSABLE; | |
761ab470 | 1044 | /* the hdr variable is invalid now! */ |
1990af8d | 1045 | |
97359d12 JB |
1046 | switch (rx->key->conf.cipher) { |
1047 | case WLAN_CIPHER_SUITE_WEP40: | |
1048 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
1049 | /* Check for weak IVs if possible */ |
1050 | if (rx->sta && ieee80211_is_data(fc) && | |
1051 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
1052 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1053 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
1054 | rx->sta->wep_weak_iv_count++; | |
1055 | ||
e2f036da MN |
1056 | result = ieee80211_crypto_wep_decrypt(rx); |
1057 | break; | |
97359d12 | 1058 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
1059 | result = ieee80211_crypto_tkip_decrypt(rx); |
1060 | break; | |
97359d12 | 1061 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1062 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1063 | break; | |
97359d12 | 1064 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1065 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1066 | break; | |
3ffc2a90 JB |
1067 | default: |
1068 | /* | |
1069 | * We can reach here only with HW-only algorithms | |
1070 | * but why didn't it decrypt the frame?! | |
1071 | */ | |
1072 | return RX_DROP_UNUSABLE; | |
70f08765 JB |
1073 | } |
1074 | ||
e2f036da | 1075 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1076 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1077 | |
1078 | return result; | |
70f08765 JB |
1079 | } |
1080 | ||
572e0012 KV |
1081 | static ieee80211_rx_result debug_noinline |
1082 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1083 | { | |
1084 | struct ieee80211_local *local; | |
1085 | struct ieee80211_hdr *hdr; | |
1086 | struct sk_buff *skb; | |
1087 | ||
1088 | local = rx->local; | |
1089 | skb = rx->skb; | |
1090 | hdr = (struct ieee80211_hdr *) skb->data; | |
1091 | ||
1092 | if (!local->pspolling) | |
1093 | return RX_CONTINUE; | |
1094 | ||
1095 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1096 | /* this is not from AP */ | |
1097 | return RX_CONTINUE; | |
1098 | ||
1099 | if (!ieee80211_is_data(hdr->frame_control)) | |
1100 | return RX_CONTINUE; | |
1101 | ||
1102 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1103 | /* AP has no more frames buffered for us */ | |
1104 | local->pspolling = false; | |
1105 | return RX_CONTINUE; | |
1106 | } | |
1107 | ||
1108 | /* more data bit is set, let's request a new frame from the AP */ | |
1109 | ieee80211_send_pspoll(local, rx->sdata); | |
1110 | ||
1111 | return RX_CONTINUE; | |
1112 | } | |
1113 | ||
133b8226 | 1114 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1115 | { |
133b8226 | 1116 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1117 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1118 | |
3e122be0 | 1119 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1120 | set_sta_flags(sta, WLAN_STA_PS_STA); |
12375ef9 | 1121 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1122 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1123 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1124 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1125 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1126 | } | |
1127 | ||
ff9458d3 | 1128 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1129 | { |
133b8226 | 1130 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1131 | |
3e122be0 | 1132 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1133 | |
571ecf67 | 1134 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1135 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1136 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1137 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1138 | |
af818581 | 1139 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1140 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1141 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1142 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1143 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1144 | return; |
1145 | } | |
1146 | ||
1147 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1148 | } |
1149 | ||
49461622 | 1150 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1151 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1152 | { |
1153 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1154 | struct sk_buff *skb = rx->skb; |
1155 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1156 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1157 | |
1158 | if (!sta) | |
9ae54c84 | 1159 | return RX_CONTINUE; |
571ecf67 | 1160 | |
b291ba11 JB |
1161 | /* |
1162 | * Update last_rx only for IBSS packets which are for the current | |
1163 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1164 | * where other STAs start using different BSSID. | |
1165 | */ | |
05c914fe | 1166 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1167 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1168 | NL80211_IFTYPE_ADHOC); |
46900298 | 1169 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1170 | sta->last_rx = jiffies; |
b291ba11 JB |
1171 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1172 | /* | |
33b64eb2 LCC |
1173 | * Mesh beacons will update last_rx when if they are found to |
1174 | * match the current local configuration when processed. | |
571ecf67 | 1175 | */ |
b291ba11 | 1176 | sta->last_rx = jiffies; |
571ecf67 JB |
1177 | } |
1178 | ||
554891e6 | 1179 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1180 | return RX_CONTINUE; |
571ecf67 | 1181 | |
3cf335d5 KV |
1182 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1183 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1184 | ||
571ecf67 JB |
1185 | sta->rx_fragments++; |
1186 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1187 | sta->last_signal = status->signal; |
541a45a1 | 1188 | ewma_add(&sta->avg_signal, -status->signal); |
571ecf67 | 1189 | |
72eaa43a JB |
1190 | /* |
1191 | * Change STA power saving mode only at the end of a frame | |
1192 | * exchange sequence. | |
1193 | */ | |
3e122be0 | 1194 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
4cfda47b | 1195 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
05c914fe JB |
1196 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1197 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1198 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1199 | /* |
1200 | * Ignore doze->wake transitions that are | |
1201 | * indicated by non-data frames, the standard | |
1202 | * is unclear here, but for example going to | |
1203 | * PS mode and then scanning would cause a | |
1204 | * doze->wake transition for the probe request, | |
1205 | * and that is clearly undesirable. | |
1206 | */ | |
1207 | if (ieee80211_is_data(hdr->frame_control) && | |
1208 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1209 | ap_sta_ps_end(sta); |
72eaa43a JB |
1210 | } else { |
1211 | if (ieee80211_has_pm(hdr->frame_control)) | |
1212 | ap_sta_ps_start(sta); | |
1213 | } | |
571ecf67 JB |
1214 | } |
1215 | ||
22403def JB |
1216 | /* |
1217 | * Drop (qos-)data::nullfunc frames silently, since they | |
1218 | * are used only to control station power saving mode. | |
1219 | */ | |
1220 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1221 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1222 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1223 | |
1224 | /* | |
1225 | * If we receive a 4-addr nullfunc frame from a STA | |
1226 | * that was not moved to a 4-addr STA vlan yet, drop | |
1227 | * the frame to the monitor interface, to make sure | |
1228 | * that hostapd sees it | |
1229 | */ | |
1230 | if (ieee80211_has_a4(hdr->frame_control) && | |
1231 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1232 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1233 | !rx->sdata->u.vlan.sta))) | |
1234 | return RX_DROP_MONITOR; | |
22403def JB |
1235 | /* |
1236 | * Update counter and free packet here to avoid | |
1237 | * counting this as a dropped packed. | |
1238 | */ | |
571ecf67 JB |
1239 | sta->rx_packets++; |
1240 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1241 | return RX_QUEUED; |
571ecf67 JB |
1242 | } |
1243 | ||
9ae54c84 | 1244 | return RX_CONTINUE; |
571ecf67 JB |
1245 | } /* ieee80211_rx_h_sta_process */ |
1246 | ||
571ecf67 JB |
1247 | static inline struct ieee80211_fragment_entry * |
1248 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1249 | unsigned int frag, unsigned int seq, int rx_queue, | |
1250 | struct sk_buff **skb) | |
1251 | { | |
1252 | struct ieee80211_fragment_entry *entry; | |
1253 | int idx; | |
1254 | ||
1255 | idx = sdata->fragment_next; | |
1256 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1257 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1258 | sdata->fragment_next = 0; | |
1259 | ||
1260 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1261 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1262 | struct ieee80211_hdr *hdr = |
1263 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1264 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1265 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1266 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1267 | sdata->name, idx, |
571ecf67 | 1268 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1269 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1270 | #endif |
571ecf67 JB |
1271 | __skb_queue_purge(&entry->skb_list); |
1272 | } | |
1273 | ||
1274 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1275 | *skb = NULL; | |
1276 | entry->first_frag_time = jiffies; | |
1277 | entry->seq = seq; | |
1278 | entry->rx_queue = rx_queue; | |
1279 | entry->last_frag = frag; | |
1280 | entry->ccmp = 0; | |
1281 | entry->extra_len = 0; | |
1282 | ||
1283 | return entry; | |
1284 | } | |
1285 | ||
1286 | static inline struct ieee80211_fragment_entry * | |
1287 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1288 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1289 | int rx_queue, struct ieee80211_hdr *hdr) |
1290 | { | |
1291 | struct ieee80211_fragment_entry *entry; | |
1292 | int i, idx; | |
1293 | ||
1294 | idx = sdata->fragment_next; | |
1295 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1296 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1297 | |
1298 | idx--; | |
1299 | if (idx < 0) | |
1300 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1301 | ||
1302 | entry = &sdata->fragments[idx]; | |
1303 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1304 | entry->rx_queue != rx_queue || | |
1305 | entry->last_frag + 1 != frag) | |
1306 | continue; | |
1307 | ||
b73d70ad | 1308 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1309 | |
b73d70ad HH |
1310 | /* |
1311 | * Check ftype and addresses are equal, else check next fragment | |
1312 | */ | |
1313 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1314 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1315 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1316 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1317 | continue; | |
1318 | ||
ab46623e | 1319 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1320 | __skb_queue_purge(&entry->skb_list); |
1321 | continue; | |
1322 | } | |
1323 | return entry; | |
1324 | } | |
1325 | ||
1326 | return NULL; | |
1327 | } | |
1328 | ||
49461622 | 1329 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1330 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1331 | { |
1332 | struct ieee80211_hdr *hdr; | |
1333 | u16 sc; | |
358c8d9d | 1334 | __le16 fc; |
571ecf67 JB |
1335 | unsigned int frag, seq; |
1336 | struct ieee80211_fragment_entry *entry; | |
1337 | struct sk_buff *skb; | |
554891e6 | 1338 | struct ieee80211_rx_status *status; |
571ecf67 | 1339 | |
b73d70ad | 1340 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1341 | fc = hdr->frame_control; |
571ecf67 JB |
1342 | sc = le16_to_cpu(hdr->seq_ctrl); |
1343 | frag = sc & IEEE80211_SCTL_FRAG; | |
1344 | ||
358c8d9d | 1345 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1346 | (rx->skb)->len < 24 || |
1347 | is_multicast_ether_addr(hdr->addr1))) { | |
1348 | /* not fragmented */ | |
1349 | goto out; | |
1350 | } | |
1351 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1352 | ||
e3cf8b3f ZY |
1353 | if (skb_linearize(rx->skb)) |
1354 | return RX_DROP_UNUSABLE; | |
1355 | ||
058897a4 AK |
1356 | /* |
1357 | * skb_linearize() might change the skb->data and | |
1358 | * previously cached variables (in this case, hdr) need to | |
1359 | * be refreshed with the new data. | |
1360 | */ | |
1361 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1362 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1363 | ||
1364 | if (frag == 0) { | |
1365 | /* This is the first fragment of a new frame. */ | |
1366 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1367 | rx->queue, &(rx->skb)); |
97359d12 | 1368 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1369 | ieee80211_has_protected(fc)) { |
9190252c JM |
1370 | int queue = ieee80211_is_mgmt(fc) ? |
1371 | NUM_RX_DATA_QUEUES : rx->queue; | |
571ecf67 JB |
1372 | /* Store CCMP PN so that we can verify that the next |
1373 | * fragment has a sequential PN value. */ | |
1374 | entry->ccmp = 1; | |
1375 | memcpy(entry->last_pn, | |
9190252c | 1376 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1377 | CCMP_PN_LEN); |
1378 | } | |
9ae54c84 | 1379 | return RX_QUEUED; |
571ecf67 JB |
1380 | } |
1381 | ||
1382 | /* This is a fragment for a frame that should already be pending in | |
1383 | * fragment cache. Add this fragment to the end of the pending entry. | |
1384 | */ | |
b73d70ad | 1385 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1386 | if (!entry) { |
1387 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1388 | return RX_DROP_MONITOR; |
571ecf67 JB |
1389 | } |
1390 | ||
1391 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1392 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1393 | if (entry->ccmp) { | |
1394 | int i; | |
1395 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1396 | int queue; |
97359d12 | 1397 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1398 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1399 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1400 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1401 | pn[i]++; | |
1402 | if (pn[i]) | |
1403 | break; | |
1404 | } | |
9190252c JM |
1405 | queue = ieee80211_is_mgmt(fc) ? |
1406 | NUM_RX_DATA_QUEUES : rx->queue; | |
1407 | rpn = rx->key->u.ccmp.rx_pn[queue]; | |
f4ea83dd | 1408 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1409 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1410 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1411 | } | |
1412 | ||
358c8d9d | 1413 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1414 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1415 | entry->last_frag = frag; | |
1416 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1417 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1418 | rx->skb = NULL; |
9ae54c84 | 1419 | return RX_QUEUED; |
571ecf67 JB |
1420 | } |
1421 | ||
1422 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1423 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1424 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1425 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1426 | GFP_ATOMIC))) { | |
1427 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1428 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1429 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1430 | } |
1431 | } | |
1432 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1433 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1434 | dev_kfree_skb(skb); | |
1435 | } | |
1436 | ||
1437 | /* Complete frame has been reassembled - process it now */ | |
554891e6 JB |
1438 | status = IEEE80211_SKB_RXCB(rx->skb); |
1439 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
571ecf67 JB |
1440 | |
1441 | out: | |
1442 | if (rx->sta) | |
1443 | rx->sta->rx_packets++; | |
1444 | if (is_multicast_ether_addr(hdr->addr1)) | |
1445 | rx->local->dot11MulticastReceivedFrameCount++; | |
1446 | else | |
1447 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1448 | return RX_CONTINUE; |
571ecf67 JB |
1449 | } |
1450 | ||
49461622 | 1451 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1452 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1453 | { |
af818581 | 1454 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1455 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
554891e6 | 1456 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1457 | |
358c8d9d | 1458 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
554891e6 | 1459 | !(status->rx_flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1460 | return RX_CONTINUE; |
571ecf67 | 1461 | |
05c914fe JB |
1462 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1463 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1464 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1465 | |
af818581 JB |
1466 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1467 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1468 | else | |
1469 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1470 | |
9ae54c84 | 1471 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1472 | * count as an dropped frame. */ |
1473 | dev_kfree_skb(rx->skb); | |
1474 | ||
9ae54c84 | 1475 | return RX_QUEUED; |
571ecf67 JB |
1476 | } |
1477 | ||
49461622 | 1478 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1479 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1480 | { |
6e0d114d | 1481 | u8 *data = rx->skb->data; |
238f74a2 | 1482 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1483 | |
238f74a2 | 1484 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1485 | return RX_CONTINUE; |
6e0d114d JB |
1486 | |
1487 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1488 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1489 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1490 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1491 | /* change frame type to non QOS */ |
238f74a2 | 1492 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1493 | |
9ae54c84 | 1494 | return RX_CONTINUE; |
6e0d114d JB |
1495 | } |
1496 | ||
76ee65bf | 1497 | static int |
5cf121c3 | 1498 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1499 | { |
07346f81 | 1500 | if (unlikely(!rx->sta || |
f4ea83dd | 1501 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1502 | return -EACCES; |
571ecf67 | 1503 | |
76ee65bf | 1504 | return 0; |
571ecf67 JB |
1505 | } |
1506 | ||
76ee65bf | 1507 | static int |
358c8d9d | 1508 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1509 | { |
eb9fb5b8 JB |
1510 | struct sk_buff *skb = rx->skb; |
1511 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1512 | ||
3017b80b | 1513 | /* |
7848ba7d JB |
1514 | * Pass through unencrypted frames if the hardware has |
1515 | * decrypted them already. | |
3017b80b | 1516 | */ |
eb9fb5b8 | 1517 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1518 | return 0; |
571ecf67 JB |
1519 | |
1520 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1521 | if (unlikely(!ieee80211_has_protected(fc) && |
1522 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1523 | ieee80211_is_data(fc) && |
b3fc9c6c | 1524 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1525 | return -EACCES; |
bef5d1c7 JB |
1526 | |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | static int | |
1531 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1532 | { | |
1533 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1534 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1535 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1536 | |
e3efca0a JM |
1537 | /* |
1538 | * Pass through unencrypted frames if the hardware has | |
1539 | * decrypted them already. | |
1540 | */ | |
1541 | if (status->flag & RX_FLAG_DECRYPTED) | |
1542 | return 0; | |
bef5d1c7 | 1543 | |
f2ca3ea4 | 1544 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1545 | if (unlikely(!ieee80211_has_protected(fc) && |
1546 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
cf4e594e JM |
1547 | rx->key)) { |
1548 | if (ieee80211_is_deauth(fc)) | |
1549 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1550 | rx->skb->data, | |
1551 | rx->skb->len); | |
1552 | else if (ieee80211_is_disassoc(fc)) | |
1553 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1554 | rx->skb->data, | |
1555 | rx->skb->len); | |
f2ca3ea4 | 1556 | return -EACCES; |
cf4e594e | 1557 | } |
f2ca3ea4 | 1558 | /* BIP does not use Protected field, so need to check MMIE */ |
f64f9e71 | 1559 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
cf4e594e JM |
1560 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
1561 | if (ieee80211_is_deauth(fc)) | |
1562 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1563 | rx->skb->data, | |
1564 | rx->skb->len); | |
1565 | else if (ieee80211_is_disassoc(fc)) | |
1566 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1567 | rx->skb->data, | |
1568 | rx->skb->len); | |
f2ca3ea4 | 1569 | return -EACCES; |
cf4e594e | 1570 | } |
f2ca3ea4 JM |
1571 | /* |
1572 | * When using MFP, Action frames are not allowed prior to | |
1573 | * having configured keys. | |
1574 | */ | |
1575 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1576 | ieee80211_is_robust_mgmt_frame( | |
1577 | (struct ieee80211_hdr *) rx->skb->data))) | |
1578 | return -EACCES; | |
1579 | } | |
b3fc9c6c | 1580 | |
76ee65bf | 1581 | return 0; |
571ecf67 JB |
1582 | } |
1583 | ||
76ee65bf | 1584 | static int |
e31a16d6 | 1585 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1586 | { |
eb9fb5b8 | 1587 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee FF |
1588 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1589 | ||
9bc383de JB |
1590 | if (ieee80211_has_a4(hdr->frame_control) && |
1591 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1592 | return -1; |
9bc383de JB |
1593 | |
1594 | if (is_multicast_ether_addr(hdr->addr1) && | |
1595 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1596 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1597 | return -1; |
571ecf67 | 1598 | |
47846c9b | 1599 | return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
76ee65bf | 1600 | } |
571ecf67 | 1601 | |
ce3edf6d JB |
1602 | /* |
1603 | * requires that rx->skb is a frame with ethernet header | |
1604 | */ | |
358c8d9d | 1605 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1606 | { |
c97c23e3 | 1607 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1608 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1609 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1610 | ||
1611 | /* | |
1612 | * Allow EAPOL frames to us/the PAE group address regardless | |
1613 | * of whether the frame was encrypted or not. | |
1614 | */ | |
a621fa4d | 1615 | if (ehdr->h_proto == rx->sdata->control_port_protocol && |
47846c9b | 1616 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1617 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1618 | return true; | |
1619 | ||
1620 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1621 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1622 | return false; |
1623 | ||
1624 | return true; | |
1625 | } | |
1626 | ||
1627 | /* | |
1628 | * requires that rx->skb is a frame with ethernet header | |
1629 | */ | |
76ee65bf | 1630 | static void |
5cf121c3 | 1631 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1632 | { |
eb9fb5b8 JB |
1633 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1634 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1635 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1636 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1637 | struct sta_info *dsta; | |
554891e6 | 1638 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1639 | |
76ee65bf RR |
1640 | skb = rx->skb; |
1641 | xmit_skb = NULL; | |
571ecf67 | 1642 | |
05c914fe JB |
1643 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1644 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1645 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
554891e6 | 1646 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
9bc383de | 1647 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
ce3edf6d JB |
1648 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1649 | /* | |
1650 | * send multicast frames both to higher layers in | |
1651 | * local net stack and back to the wireless medium | |
1652 | */ | |
76ee65bf RR |
1653 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1654 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1655 | printk(KERN_DEBUG "%s: failed to clone " |
1656 | "multicast frame\n", dev->name); | |
1657 | } else { | |
abe60632 JB |
1658 | dsta = sta_info_get(sdata, skb->data); |
1659 | if (dsta) { | |
ce3edf6d JB |
1660 | /* |
1661 | * The destination station is associated to | |
1662 | * this AP (in this VLAN), so send the frame | |
1663 | * directly to it and do not pass it to local | |
1664 | * net stack. | |
571ecf67 | 1665 | */ |
76ee65bf | 1666 | xmit_skb = skb; |
571ecf67 JB |
1667 | skb = NULL; |
1668 | } | |
571ecf67 JB |
1669 | } |
1670 | } | |
1671 | ||
1672 | if (skb) { | |
d1c3a37c JB |
1673 | int align __maybe_unused; |
1674 | ||
59d9cb07 | 1675 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1676 | /* |
1677 | * 'align' will only take the values 0 or 2 here | |
1678 | * since all frames are required to be aligned | |
1679 | * to 2-byte boundaries when being passed to | |
1680 | * mac80211. That also explains the __skb_push() | |
1681 | * below. | |
1682 | */ | |
dacb6f1d | 1683 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1684 | if (align) { |
1685 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1686 | dev_kfree_skb(skb); | |
1687 | skb = NULL; | |
1688 | } else { | |
1689 | u8 *data = skb->data; | |
8ce0b589 ZY |
1690 | size_t len = skb_headlen(skb); |
1691 | skb->data -= align; | |
1692 | memmove(skb->data, data, len); | |
1693 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1694 | } |
1695 | } | |
1696 | #endif | |
1697 | ||
1698 | if (skb) { | |
1699 | /* deliver to local stack */ | |
1700 | skb->protocol = eth_type_trans(skb, dev); | |
1701 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1702 | netif_receive_skb(skb); |
d1c3a37c | 1703 | } |
571ecf67 JB |
1704 | } |
1705 | ||
76ee65bf | 1706 | if (xmit_skb) { |
571ecf67 | 1707 | /* send to wireless media */ |
f831e909 | 1708 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1709 | skb_reset_network_header(xmit_skb); |
1710 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1711 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1712 | } |
76ee65bf RR |
1713 | } |
1714 | ||
49461622 | 1715 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1716 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1717 | { |
eb9fb5b8 | 1718 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1719 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1720 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1721 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1722 | struct sk_buff_head frame_list; |
554891e6 | 1723 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
fd4c7f2f | 1724 | |
358c8d9d | 1725 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1726 | return RX_CONTINUE; |
fd4c7f2f | 1727 | |
358c8d9d | 1728 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1729 | return RX_DROP_MONITOR; |
fd4c7f2f | 1730 | |
554891e6 | 1731 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1732 | return RX_CONTINUE; |
fd4c7f2f | 1733 | |
eaf85ca7 ZY |
1734 | if (ieee80211_has_a4(hdr->frame_control) && |
1735 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1736 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1737 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1738 | |
eaf85ca7 ZY |
1739 | if (is_multicast_ether_addr(hdr->addr1) && |
1740 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1741 | rx->sdata->u.vlan.sta) || | |
1742 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1743 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1744 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1745 | |
eaf85ca7 ZY |
1746 | skb->dev = dev; |
1747 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1748 | |
e3cf8b3f ZY |
1749 | if (skb_linearize(skb)) |
1750 | return RX_DROP_UNUSABLE; | |
1751 | ||
eaf85ca7 ZY |
1752 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1753 | rx->sdata->vif.type, | |
1754 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1755 | |
eaf85ca7 ZY |
1756 | while (!skb_queue_empty(&frame_list)) { |
1757 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1758 | |
358c8d9d | 1759 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1760 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1761 | continue; |
1762 | } | |
eaf85ca7 ZY |
1763 | dev->stats.rx_packets++; |
1764 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1765 | |
1766 | ieee80211_deliver_skb(rx); | |
1767 | } | |
1768 | ||
9ae54c84 | 1769 | return RX_QUEUED; |
fd4c7f2f RR |
1770 | } |
1771 | ||
bf94e17b | 1772 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1773 | static ieee80211_rx_result |
e32f85f7 LCC |
1774 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1775 | { | |
1776 | struct ieee80211_hdr *hdr; | |
1777 | struct ieee80211s_hdr *mesh_hdr; | |
1778 | unsigned int hdrlen; | |
1779 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1780 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1781 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
554891e6 | 1782 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
e32f85f7 LCC |
1783 | |
1784 | hdr = (struct ieee80211_hdr *) skb->data; | |
1785 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1786 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1787 | ||
1788 | if (!ieee80211_is_data(hdr->frame_control)) | |
1789 | return RX_CONTINUE; | |
1790 | ||
1791 | if (!mesh_hdr->ttl) | |
1792 | /* illegal frame */ | |
1793 | return RX_DROP_MONITOR; | |
1794 | ||
43b7b314 | 1795 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1796 | struct mesh_path *mppath; |
43b7b314 JC |
1797 | char *proxied_addr; |
1798 | char *mpp_addr; | |
1799 | ||
1800 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1801 | mpp_addr = hdr->addr3; | |
1802 | proxied_addr = mesh_hdr->eaddr1; | |
1803 | } else { | |
1804 | mpp_addr = hdr->addr4; | |
1805 | proxied_addr = mesh_hdr->eaddr2; | |
1806 | } | |
79617dee | 1807 | |
79617dee | 1808 | rcu_read_lock(); |
43b7b314 | 1809 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1810 | if (!mppath) { |
43b7b314 | 1811 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1812 | } else { |
1813 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1814 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1815 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1816 | spin_unlock_bh(&mppath->state_lock); |
1817 | } | |
1818 | rcu_read_unlock(); | |
1819 | } | |
1820 | ||
3c5772a5 JC |
1821 | /* Frame has reached destination. Don't forward */ |
1822 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1823 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1824 | return RX_CONTINUE; |
1825 | ||
1826 | mesh_hdr->ttl--; | |
1827 | ||
554891e6 | 1828 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
e32f85f7 | 1829 | if (!mesh_hdr->ttl) |
472dbc45 | 1830 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1831 | dropped_frames_ttl); |
1832 | else { | |
1833 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1834 | struct ieee80211_tx_info *info; |
1835 | ||
e32f85f7 LCC |
1836 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1837 | ||
1838 | if (!fwd_skb && net_ratelimit()) | |
1839 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1840 | sdata->name); |
e32f85f7 LCC |
1841 | |
1842 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1843 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1844 | info = IEEE80211_SKB_CB(fwd_skb); |
1845 | memset(info, 0, sizeof(*info)); | |
1846 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1847 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1848 | skb_set_queue_mapping(skb, |
1849 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1850 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1851 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1852 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1853 | fwded_mcast); | |
1854 | else { | |
3c5772a5 JC |
1855 | int err; |
1856 | /* | |
1857 | * Save TA to addr1 to send TA a path error if a | |
1858 | * suitable next hop is not found | |
1859 | */ | |
1860 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1861 | ETH_ALEN); |
3c5772a5 | 1862 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1863 | /* Failed to immediately resolve next hop: |
1864 | * fwded frame was dropped or will be added | |
1865 | * later to the pending skb queue. */ | |
1866 | if (err) | |
1867 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1868 | |
1869 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1870 | fwded_unicast); | |
249b405c JC |
1871 | } |
1872 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1873 | fwded_frames); | |
3b8d81e0 | 1874 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1875 | } |
1876 | } | |
1877 | ||
3c5772a5 | 1878 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1879 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1880 | return RX_CONTINUE; |
1881 | else | |
1882 | return RX_DROP_MONITOR; | |
1883 | } | |
bf94e17b | 1884 | #endif |
e32f85f7 | 1885 | |
49461622 | 1886 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1887 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1888 | { |
eb9fb5b8 | 1889 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1890 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1891 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1892 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1893 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1894 | int err; |
76ee65bf | 1895 | |
358c8d9d | 1896 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1897 | return RX_CONTINUE; |
76ee65bf | 1898 | |
358c8d9d | 1899 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1900 | return RX_DROP_MONITOR; |
76ee65bf | 1901 | |
f14543ee FF |
1902 | /* |
1903 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1904 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1905 | */ | |
1906 | if (ieee80211_has_a4(hdr->frame_control) && | |
1907 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1908 | return RX_DROP_MONITOR; | |
1909 | ||
e31a16d6 | 1910 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1911 | if (unlikely(err)) |
e4c26add | 1912 | return RX_DROP_UNUSABLE; |
76ee65bf | 1913 | |
358c8d9d | 1914 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1915 | return RX_DROP_MONITOR; |
ce3edf6d | 1916 | |
76ee65bf RR |
1917 | rx->skb->dev = dev; |
1918 | ||
1919 | dev->stats.rx_packets++; | |
1920 | dev->stats.rx_bytes += rx->skb->len; | |
1921 | ||
08ca944e HS |
1922 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
1923 | !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) { | |
e15276a4 VN |
1924 | mod_timer(&local->dynamic_ps_timer, jiffies + |
1925 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1926 | } | |
1927 | ||
76ee65bf | 1928 | ieee80211_deliver_skb(rx); |
571ecf67 | 1929 | |
9ae54c84 | 1930 | return RX_QUEUED; |
571ecf67 JB |
1931 | } |
1932 | ||
49461622 | 1933 | static ieee80211_rx_result debug_noinline |
2569a826 | 1934 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
71364716 RR |
1935 | { |
1936 | struct ieee80211_local *local = rx->local; | |
1937 | struct ieee80211_hw *hw = &local->hw; | |
1938 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1939 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1940 | struct tid_ampdu_rx *tid_agg_rx; |
1941 | u16 start_seq_num; | |
1942 | u16 tid; | |
1943 | ||
a7767f95 | 1944 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1945 | return RX_CONTINUE; |
71364716 | 1946 | |
a7767f95 | 1947 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
1948 | struct { |
1949 | __le16 control, start_seq_num; | |
1950 | } __packed bar_data; | |
1951 | ||
71364716 | 1952 | if (!rx->sta) |
a02ae758 | 1953 | return RX_DROP_MONITOR; |
8ae5977f JB |
1954 | |
1955 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
1956 | &bar_data, sizeof(bar_data))) | |
1957 | return RX_DROP_MONITOR; | |
1958 | ||
8ae5977f | 1959 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
1960 | |
1961 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
1962 | if (!tid_agg_rx) | |
a02ae758 | 1963 | return RX_DROP_MONITOR; |
71364716 | 1964 | |
8ae5977f | 1965 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
1966 | |
1967 | /* reset session timer */ | |
20ad19d0 JB |
1968 | if (tid_agg_rx->timeout) |
1969 | mod_timer(&tid_agg_rx->session_timer, | |
1970 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1971 | |
dd318575 | 1972 | spin_lock(&tid_agg_rx->reorder_lock); |
a02ae758 | 1973 | /* release stored frames up to start of BAR */ |
2569a826 JB |
1974 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
1975 | frames); | |
dd318575 JB |
1976 | spin_unlock(&tid_agg_rx->reorder_lock); |
1977 | ||
a02ae758 JB |
1978 | kfree_skb(skb); |
1979 | return RX_QUEUED; | |
71364716 RR |
1980 | } |
1981 | ||
08daecae JB |
1982 | /* |
1983 | * After this point, we only want management frames, | |
1984 | * so we can drop all remaining control frames to | |
1985 | * cooked monitor interfaces. | |
1986 | */ | |
1987 | return RX_DROP_MONITOR; | |
71364716 RR |
1988 | } |
1989 | ||
f4f727a6 JM |
1990 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1991 | struct ieee80211_mgmt *mgmt, | |
1992 | size_t len) | |
fea14732 JM |
1993 | { |
1994 | struct ieee80211_local *local = sdata->local; | |
1995 | struct sk_buff *skb; | |
1996 | struct ieee80211_mgmt *resp; | |
1997 | ||
47846c9b | 1998 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
1999 | /* Not to own unicast address */ |
2000 | return; | |
2001 | } | |
2002 | ||
46900298 JB |
2003 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
2004 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 2005 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
2006 | return; |
2007 | } | |
2008 | ||
2009 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2010 | /* Too short SA Query request frame */ | |
2011 | return; | |
2012 | } | |
2013 | ||
2014 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2015 | if (skb == NULL) | |
2016 | return; | |
2017 | ||
2018 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2019 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2020 | memset(resp, 0, 24); | |
2021 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 2022 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 2023 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
2024 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2025 | IEEE80211_STYPE_ACTION); | |
2026 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2027 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2028 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2029 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2030 | mgmt->u.action.u.sa_query.trans_id, | |
2031 | WLAN_SA_QUERY_TR_ID_LEN); | |
2032 | ||
62ae67be | 2033 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
2034 | } |
2035 | ||
2e161f78 JB |
2036 | static ieee80211_rx_result debug_noinline |
2037 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2038 | { | |
2039 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
554891e6 | 2040 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2041 | |
2042 | /* | |
2043 | * From here on, look only at management frames. | |
2044 | * Data and control frames are already handled, | |
2045 | * and unknown (reserved) frames are useless. | |
2046 | */ | |
2047 | if (rx->skb->len < 24) | |
2048 | return RX_DROP_MONITOR; | |
2049 | ||
2050 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2051 | return RX_DROP_MONITOR; | |
2052 | ||
554891e6 | 2053 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
2e161f78 JB |
2054 | return RX_DROP_MONITOR; |
2055 | ||
2056 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2057 | return RX_DROP_UNUSABLE; | |
2058 | ||
2059 | return RX_CONTINUE; | |
2060 | } | |
2061 | ||
de1ede7a JB |
2062 | static ieee80211_rx_result debug_noinline |
2063 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2064 | { | |
2065 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 2066 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 2067 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
554891e6 | 2068 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
de1ede7a JB |
2069 | int len = rx->skb->len; |
2070 | ||
2071 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2072 | return RX_CONTINUE; | |
2073 | ||
026331c4 JM |
2074 | /* drop too small frames */ |
2075 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 2076 | return RX_DROP_UNUSABLE; |
de1ede7a | 2077 | |
026331c4 | 2078 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 2079 | return RX_DROP_UNUSABLE; |
de1ede7a | 2080 | |
554891e6 | 2081 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 2082 | return RX_DROP_UNUSABLE; |
97ebe12a | 2083 | |
de1ede7a JB |
2084 | switch (mgmt->u.action.category) { |
2085 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
2086 | /* |
2087 | * The aggregation code is not prepared to handle | |
2088 | * anything but STA/AP due to the BSSID handling; | |
2089 | * IBSS could work in the code but isn't supported | |
2090 | * by drivers or the standard. | |
2091 | */ | |
2092 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2093 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2094 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 2095 | break; |
8abd3f9b | 2096 | |
026331c4 JM |
2097 | /* verify action_code is present */ |
2098 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2099 | break; | |
2100 | ||
de1ede7a JB |
2101 | switch (mgmt->u.action.u.addba_req.action_code) { |
2102 | case WLAN_ACTION_ADDBA_REQ: | |
2103 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2104 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
2105 | goto invalid; |
2106 | break; | |
de1ede7a JB |
2107 | case WLAN_ACTION_ADDBA_RESP: |
2108 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2109 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
2110 | goto invalid; |
2111 | break; | |
de1ede7a JB |
2112 | case WLAN_ACTION_DELBA: |
2113 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2114 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
2115 | goto invalid; |
2116 | break; | |
2117 | default: | |
2118 | goto invalid; | |
de1ede7a | 2119 | } |
bed7ee6e | 2120 | |
8b58ff83 | 2121 | goto queue; |
39192c0b JB |
2122 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2123 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2124 | break; |
46900298 JB |
2125 | |
2126 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2127 | break; |
46900298 | 2128 | |
026331c4 JM |
2129 | /* verify action_code is present */ |
2130 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2131 | break; | |
2132 | ||
39192c0b JB |
2133 | switch (mgmt->u.action.u.measurement.action_code) { |
2134 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2135 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2136 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2137 | break; |
39192c0b | 2138 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2139 | goto handled; |
c481ec97 S |
2140 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2141 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2142 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2143 | break; |
c481ec97 | 2144 | |
cc32abd4 | 2145 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2146 | break; |
cc32abd4 | 2147 | |
46900298 | 2148 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2149 | break; |
c481ec97 | 2150 | |
8b58ff83 | 2151 | goto queue; |
39192c0b JB |
2152 | } |
2153 | break; | |
fea14732 JM |
2154 | case WLAN_CATEGORY_SA_QUERY: |
2155 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2156 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2157 | break; |
2158 | ||
fea14732 JM |
2159 | switch (mgmt->u.action.u.sa_query.action) { |
2160 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2161 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2162 | break; |
fea14732 | 2163 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2164 | goto handled; |
fea14732 JM |
2165 | } |
2166 | break; | |
97ad9139 | 2167 | case WLAN_CATEGORY_MESH_PLINK: |
77a121c3 JB |
2168 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2169 | break; | |
8b58ff83 | 2170 | goto queue; |
c7108a71 JC |
2171 | case WLAN_CATEGORY_MESH_PATH_SEL: |
2172 | if (!mesh_path_sel_is_hwmp(sdata)) | |
2173 | break; | |
2174 | goto queue; | |
84040805 | 2175 | } |
026331c4 | 2176 | |
2e161f78 JB |
2177 | return RX_CONTINUE; |
2178 | ||
bed7ee6e | 2179 | invalid: |
554891e6 | 2180 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
2e161f78 JB |
2181 | /* will return in the next handlers */ |
2182 | return RX_CONTINUE; | |
2183 | ||
2184 | handled: | |
2185 | if (rx->sta) | |
2186 | rx->sta->rx_packets++; | |
2187 | dev_kfree_skb(rx->skb); | |
2188 | return RX_QUEUED; | |
2189 | ||
2190 | queue: | |
2191 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2192 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2193 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2194 | if (rx->sta) | |
2195 | rx->sta->rx_packets++; | |
2196 | return RX_QUEUED; | |
2197 | } | |
2198 | ||
2199 | static ieee80211_rx_result debug_noinline | |
2200 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2201 | { | |
554891e6 | 2202 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2203 | |
2204 | /* skip known-bad action frames and return them in the next handler */ | |
554891e6 | 2205 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
2e161f78 | 2206 | return RX_CONTINUE; |
d7907448 | 2207 | |
026331c4 JM |
2208 | /* |
2209 | * Getting here means the kernel doesn't know how to handle | |
2210 | * it, but maybe userspace does ... include returned frames | |
2211 | * so userspace can register for those to know whether ones | |
2212 | * it transmitted were processed or returned. | |
2213 | */ | |
026331c4 | 2214 | |
2e161f78 JB |
2215 | if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, |
2216 | rx->skb->data, rx->skb->len, | |
2217 | GFP_ATOMIC)) { | |
2218 | if (rx->sta) | |
2219 | rx->sta->rx_packets++; | |
2220 | dev_kfree_skb(rx->skb); | |
2221 | return RX_QUEUED; | |
2222 | } | |
2223 | ||
2224 | ||
2225 | return RX_CONTINUE; | |
2226 | } | |
2227 | ||
2228 | static ieee80211_rx_result debug_noinline | |
2229 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2230 | { | |
2231 | struct ieee80211_local *local = rx->local; | |
2232 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2233 | struct sk_buff *nskb; | |
2234 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
554891e6 | 2235 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2236 | |
2237 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2238 | return RX_CONTINUE; | |
2239 | ||
2240 | /* | |
2241 | * For AP mode, hostapd is responsible for handling any action | |
2242 | * frames that we didn't handle, including returning unknown | |
2243 | * ones. For all other modes we will return them to the sender, | |
2244 | * setting the 0x80 bit in the action category, as required by | |
2245 | * 802.11-2007 7.3.1.11. | |
2246 | * Newer versions of hostapd shall also use the management frame | |
2247 | * registration mechanisms, but older ones still use cooked | |
2248 | * monitor interfaces so push all frames there. | |
2249 | */ | |
554891e6 | 2250 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
2e161f78 JB |
2251 | (sdata->vif.type == NL80211_IFTYPE_AP || |
2252 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2253 | return RX_DROP_MONITOR; | |
026331c4 | 2254 | |
84040805 JB |
2255 | /* do not return rejected action frames */ |
2256 | if (mgmt->u.action.category & 0x80) | |
2257 | return RX_DROP_UNUSABLE; | |
2258 | ||
2259 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2260 | GFP_ATOMIC); | |
2261 | if (nskb) { | |
292b4df6 | 2262 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2263 | |
292b4df6 JL |
2264 | nmgmt->u.action.category |= 0x80; |
2265 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2266 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2267 | |
2268 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2269 | ||
2270 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a | 2271 | } |
39192c0b JB |
2272 | dev_kfree_skb(rx->skb); |
2273 | return RX_QUEUED; | |
de1ede7a JB |
2274 | } |
2275 | ||
49461622 | 2276 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2277 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2278 | { |
eb9fb5b8 | 2279 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2280 | ieee80211_rx_result rxs; |
77a121c3 JB |
2281 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2282 | __le16 stype; | |
571ecf67 | 2283 | |
af6b6374 JB |
2284 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2285 | if (rxs != RX_CONTINUE) | |
2286 | return rxs; | |
2287 | ||
77a121c3 | 2288 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2289 | |
77a121c3 JB |
2290 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2291 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2292 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2293 | return RX_DROP_MONITOR; | |
472dbc45 | 2294 | |
77a121c3 JB |
2295 | switch (stype) { |
2296 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2297 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2298 | /* process for all: mesh, mlme, ibss */ | |
2299 | break; | |
2300 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2301 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2c31333a CL |
2302 | if (is_multicast_ether_addr(mgmt->da) && |
2303 | !is_broadcast_ether_addr(mgmt->da)) | |
2304 | return RX_DROP_MONITOR; | |
2305 | ||
77a121c3 JB |
2306 | /* process only for station */ |
2307 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2308 | return RX_DROP_MONITOR; | |
2309 | break; | |
2310 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2311 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2312 | /* process only for ibss */ | |
2313 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2314 | return RX_DROP_MONITOR; | |
2315 | break; | |
2316 | default: | |
2317 | return RX_DROP_MONITOR; | |
2318 | } | |
f9d540ee | 2319 | |
77a121c3 | 2320 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2321 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2322 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2323 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2324 | if (rx->sta) |
2325 | rx->sta->rx_packets++; | |
46900298 | 2326 | |
77a121c3 | 2327 | return RX_QUEUED; |
571ecf67 JB |
2328 | } |
2329 | ||
3b8d81e0 | 2330 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2331 | struct ieee80211_rx_data *rx) |
571ecf67 | 2332 | { |
a7767f95 HH |
2333 | int keyidx; |
2334 | unsigned int hdrlen; | |
571ecf67 | 2335 | |
a7767f95 | 2336 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2337 | if (rx->skb->len >= hdrlen + 4) |
2338 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2339 | else | |
2340 | keyidx = -1; | |
2341 | ||
8944b79f | 2342 | if (!rx->sta) { |
aa0daf0e JB |
2343 | /* |
2344 | * Some hardware seem to generate incorrect Michael MIC | |
2345 | * reports; ignore them to avoid triggering countermeasures. | |
2346 | */ | |
af2ced6a | 2347 | return; |
571ecf67 JB |
2348 | } |
2349 | ||
a7767f95 | 2350 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2351 | return; |
571ecf67 | 2352 | |
05c914fe | 2353 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2354 | /* |
2355 | * APs with pairwise keys should never receive Michael MIC | |
2356 | * errors for non-zero keyidx because these are reserved for | |
2357 | * group keys and only the AP is sending real multicast | |
2358 | * frames in the BSS. | |
2359 | */ | |
af2ced6a | 2360 | return; |
571ecf67 JB |
2361 | } |
2362 | ||
a7767f95 HH |
2363 | if (!ieee80211_is_data(hdr->frame_control) && |
2364 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2365 | return; |
571ecf67 | 2366 | |
e6d6e342 JB |
2367 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2368 | GFP_ATOMIC); | |
571ecf67 JB |
2369 | } |
2370 | ||
5cf121c3 | 2371 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2372 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2373 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2374 | { |
2375 | struct ieee80211_sub_if_data *sdata; | |
2376 | struct ieee80211_local *local = rx->local; | |
2377 | struct ieee80211_rtap_hdr { | |
2378 | struct ieee80211_radiotap_header hdr; | |
2379 | u8 flags; | |
5f0b7de5 | 2380 | u8 rate_or_pad; |
3d30d949 MW |
2381 | __le16 chan_freq; |
2382 | __le16 chan_flags; | |
bc10502d | 2383 | } __packed *rthdr; |
3d30d949 MW |
2384 | struct sk_buff *skb = rx->skb, *skb2; |
2385 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2386 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2387 | |
554891e6 JB |
2388 | /* |
2389 | * If cooked monitor has been processed already, then | |
2390 | * don't do it again. If not, set the flag. | |
2391 | */ | |
2392 | if (rx->flags & IEEE80211_RX_CMNTR) | |
7c1e1831 | 2393 | goto out_free_skb; |
554891e6 | 2394 | rx->flags |= IEEE80211_RX_CMNTR; |
7c1e1831 | 2395 | |
3d30d949 MW |
2396 | if (skb_headroom(skb) < sizeof(*rthdr) && |
2397 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2398 | goto out_free_skb; | |
2399 | ||
2400 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2401 | memset(rthdr, 0, sizeof(*rthdr)); | |
2402 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2403 | rthdr->hdr.it_present = | |
2404 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2405 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2406 | ||
5f0b7de5 JB |
2407 | if (rate) { |
2408 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2409 | rthdr->hdr.it_present |= | |
2410 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2411 | } | |
3d30d949 MW |
2412 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2413 | ||
2414 | if (status->band == IEEE80211_BAND_5GHZ) | |
2415 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2416 | IEEE80211_CHAN_5GHZ); | |
2417 | else | |
2418 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2419 | IEEE80211_CHAN_2GHZ); | |
2420 | ||
2421 | skb_set_mac_header(skb, 0); | |
2422 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2423 | skb->pkt_type = PACKET_OTHERHOST; | |
2424 | skb->protocol = htons(ETH_P_802_2); | |
2425 | ||
2426 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2427 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2428 | continue; |
2429 | ||
05c914fe | 2430 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2431 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2432 | continue; | |
2433 | ||
2434 | if (prev_dev) { | |
2435 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2436 | if (skb2) { | |
2437 | skb2->dev = prev_dev; | |
5548a8a1 | 2438 | netif_receive_skb(skb2); |
3d30d949 MW |
2439 | } |
2440 | } | |
2441 | ||
2442 | prev_dev = sdata->dev; | |
2443 | sdata->dev->stats.rx_packets++; | |
2444 | sdata->dev->stats.rx_bytes += skb->len; | |
2445 | } | |
2446 | ||
2447 | if (prev_dev) { | |
2448 | skb->dev = prev_dev; | |
5548a8a1 | 2449 | netif_receive_skb(skb); |
554891e6 JB |
2450 | return; |
2451 | } | |
3d30d949 MW |
2452 | |
2453 | out_free_skb: | |
2454 | dev_kfree_skb(skb); | |
2455 | } | |
2456 | ||
aa0c8636 CL |
2457 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2458 | ieee80211_rx_result res) | |
2459 | { | |
2460 | switch (res) { | |
2461 | case RX_DROP_MONITOR: | |
2462 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2463 | if (rx->sta) | |
2464 | rx->sta->rx_dropped++; | |
2465 | /* fall through */ | |
2466 | case RX_CONTINUE: { | |
2467 | struct ieee80211_rate *rate = NULL; | |
2468 | struct ieee80211_supported_band *sband; | |
2469 | struct ieee80211_rx_status *status; | |
2470 | ||
2471 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2472 | ||
2473 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2474 | if (!(status->flag & RX_FLAG_HT)) | |
2475 | rate = &sband->bitrates[status->rate_idx]; | |
2476 | ||
2477 | ieee80211_rx_cooked_monitor(rx, rate); | |
2478 | break; | |
2479 | } | |
2480 | case RX_DROP_UNUSABLE: | |
2481 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2482 | if (rx->sta) | |
2483 | rx->sta->rx_dropped++; | |
2484 | dev_kfree_skb(rx->skb); | |
2485 | break; | |
2486 | case RX_QUEUED: | |
2487 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2488 | break; | |
2489 | } | |
2490 | } | |
571ecf67 | 2491 | |
aa0c8636 CL |
2492 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, |
2493 | struct sk_buff_head *frames) | |
58905290 | 2494 | { |
58905290 | 2495 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2496 | struct sk_buff *skb; |
8944b79f | 2497 | |
e32f85f7 LCC |
2498 | #define CALL_RXH(rxh) \ |
2499 | do { \ | |
2500 | res = rxh(rx); \ | |
2501 | if (res != RX_CONTINUE) \ | |
2569a826 | 2502 | goto rxh_next; \ |
e32f85f7 | 2503 | } while (0); |
49461622 | 2504 | |
aa0c8636 | 2505 | while ((skb = __skb_dequeue(frames))) { |
2569a826 JB |
2506 | /* |
2507 | * all the other fields are valid across frames | |
2508 | * that belong to an aMPDU since they are on the | |
2509 | * same TID from the same station | |
2510 | */ | |
2511 | rx->skb = skb; | |
554891e6 | 2512 | rx->flags = 0; |
2569a826 JB |
2513 | |
2514 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2515 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2516 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2517 | CALL_RXH(ieee80211_rx_h_defragment) | |
2518 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2519 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2520 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2521 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2522 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2523 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2524 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2525 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2526 | #endif |
2569a826 JB |
2527 | CALL_RXH(ieee80211_rx_h_data) |
2528 | ||
2529 | /* special treatment -- needs the queue */ | |
aa0c8636 | 2530 | res = ieee80211_rx_h_ctrl(rx, frames); |
2569a826 JB |
2531 | if (res != RX_CONTINUE) |
2532 | goto rxh_next; | |
2533 | ||
2e161f78 | 2534 | CALL_RXH(ieee80211_rx_h_mgmt_check) |
2569a826 | 2535 | CALL_RXH(ieee80211_rx_h_action) |
2e161f78 JB |
2536 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) |
2537 | CALL_RXH(ieee80211_rx_h_action_return) | |
2569a826 | 2538 | CALL_RXH(ieee80211_rx_h_mgmt) |
49461622 | 2539 | |
aa0c8636 CL |
2540 | rxh_next: |
2541 | ieee80211_rx_handlers_result(rx, res); | |
2542 | ||
49461622 | 2543 | #undef CALL_RXH |
aa0c8636 CL |
2544 | } |
2545 | } | |
2546 | ||
4406c376 | 2547 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
aa0c8636 CL |
2548 | { |
2549 | struct sk_buff_head reorder_release; | |
2550 | ieee80211_rx_result res = RX_DROP_MONITOR; | |
2551 | ||
2552 | __skb_queue_head_init(&reorder_release); | |
2553 | ||
aa0c8636 CL |
2554 | #define CALL_RXH(rxh) \ |
2555 | do { \ | |
2556 | res = rxh(rx); \ | |
2557 | if (res != RX_CONTINUE) \ | |
2558 | goto rxh_next; \ | |
2559 | } while (0); | |
2560 | ||
2561 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2562 | CALL_RXH(ieee80211_rx_h_check) | |
2563 | ||
2564 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); | |
2565 | ||
2566 | ieee80211_rx_handlers(rx, &reorder_release); | |
2567 | return; | |
49461622 | 2568 | |
2569a826 | 2569 | rxh_next: |
aa0c8636 CL |
2570 | ieee80211_rx_handlers_result(rx, res); |
2571 | ||
2572 | #undef CALL_RXH | |
58905290 JB |
2573 | } |
2574 | ||
2bff8ebf | 2575 | /* |
dd318575 JB |
2576 | * This function makes calls into the RX path, therefore |
2577 | * it has to be invoked under RCU read lock. | |
2bff8ebf CL |
2578 | */ |
2579 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2580 | { | |
2581 | struct sk_buff_head frames; | |
554891e6 JB |
2582 | struct ieee80211_rx_data rx = { |
2583 | .sta = sta, | |
2584 | .sdata = sta->sdata, | |
2585 | .local = sta->local, | |
2586 | .queue = tid, | |
2587 | }; | |
2c15a0cf CL |
2588 | struct tid_ampdu_rx *tid_agg_rx; |
2589 | ||
2590 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2591 | if (!tid_agg_rx) | |
2592 | return; | |
2bff8ebf CL |
2593 | |
2594 | __skb_queue_head_init(&frames); | |
2595 | ||
2c15a0cf CL |
2596 | spin_lock(&tid_agg_rx->reorder_lock); |
2597 | ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames); | |
2598 | spin_unlock(&tid_agg_rx->reorder_lock); | |
2bff8ebf CL |
2599 | |
2600 | ieee80211_rx_handlers(&rx, &frames); | |
2601 | } | |
2602 | ||
571ecf67 JB |
2603 | /* main receive path */ |
2604 | ||
20b01f80 | 2605 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
23a24def JB |
2606 | struct ieee80211_hdr *hdr) |
2607 | { | |
20b01f80 | 2608 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
eb9fb5b8 JB |
2609 | struct sk_buff *skb = rx->skb; |
2610 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2611 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2612 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2613 | ||
51fb61e7 | 2614 | switch (sdata->vif.type) { |
05c914fe | 2615 | case NL80211_IFTYPE_STATION: |
9bc383de | 2616 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2617 | return 0; |
77fdaa12 | 2618 | if (!multicast && |
47846c9b | 2619 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2620 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2621 | return 0; |
554891e6 | 2622 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2623 | } |
2624 | break; | |
05c914fe | 2625 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2626 | if (!bssid) |
2627 | return 0; | |
a7767f95 | 2628 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2629 | return 1; |
87291c02 | 2630 | } |
46900298 | 2631 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
554891e6 | 2632 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2633 | return 0; |
554891e6 | 2634 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2635 | } else if (!multicast && |
47846c9b | 2636 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2637 | hdr->addr1) != 0) { |
4150c572 | 2638 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2639 | return 0; |
554891e6 | 2640 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2641 | } else if (!rx->sta) { |
2642 | int rate_idx; | |
eb9fb5b8 | 2643 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2644 | rate_idx = 0; /* TODO: HT rates */ |
2645 | else | |
eb9fb5b8 | 2646 | rate_idx = status->rate_idx; |
34e89507 JB |
2647 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2648 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2649 | } |
23a24def | 2650 | break; |
05c914fe | 2651 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2652 | if (!multicast && |
47846c9b | 2653 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2654 | hdr->addr1) != 0) { |
2655 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2656 | return 0; | |
2657 | ||
554891e6 | 2658 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2659 | } |
2660 | break; | |
05c914fe JB |
2661 | case NL80211_IFTYPE_AP_VLAN: |
2662 | case NL80211_IFTYPE_AP: | |
23a24def | 2663 | if (!bssid) { |
47846c9b | 2664 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2665 | hdr->addr1)) |
2666 | return 0; | |
2667 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2668 | sdata->vif.addr)) { |
554891e6 | 2669 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2670 | return 0; |
554891e6 | 2671 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2672 | } |
23a24def | 2673 | break; |
05c914fe | 2674 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2675 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2676 | return 0; |
2677 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2678 | return 0; | |
2679 | break; | |
2ca27bcf | 2680 | default: |
fb1c1cd6 JB |
2681 | /* should never get here */ |
2682 | WARN_ON(1); | |
2683 | break; | |
23a24def JB |
2684 | } |
2685 | ||
2686 | return 1; | |
2687 | } | |
2688 | ||
4406c376 JB |
2689 | /* |
2690 | * This function returns whether or not the SKB | |
2691 | * was destined for RX processing or not, which, | |
2692 | * if consume is true, is equivalent to whether | |
2693 | * or not the skb was consumed. | |
2694 | */ | |
2695 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2696 | struct sk_buff *skb, bool consume) | |
2697 | { | |
2698 | struct ieee80211_local *local = rx->local; | |
2699 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2700 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2701 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2702 | int prepares; | |
2703 | ||
2704 | rx->skb = skb; | |
554891e6 | 2705 | status->rx_flags |= IEEE80211_RX_RA_MATCH; |
4406c376 JB |
2706 | prepares = prepare_for_handlers(rx, hdr); |
2707 | ||
2708 | if (!prepares) | |
2709 | return false; | |
2710 | ||
2711 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
554891e6 | 2712 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) |
4406c376 JB |
2713 | ieee80211_rx_michael_mic_report(hdr, rx); |
2714 | return false; | |
2715 | } | |
2716 | ||
2717 | if (!consume) { | |
2718 | skb = skb_copy(skb, GFP_ATOMIC); | |
2719 | if (!skb) { | |
2720 | if (net_ratelimit()) | |
2721 | wiphy_debug(local->hw.wiphy, | |
2722 | "failed to copy multicast frame for %s\n", | |
2723 | sdata->name); | |
2724 | return true; | |
2725 | } | |
2726 | ||
2727 | rx->skb = skb; | |
2728 | } | |
2729 | ||
2730 | ieee80211_invoke_rx_handlers(rx); | |
2731 | return true; | |
2732 | } | |
2733 | ||
571ecf67 | 2734 | /* |
6368e4b1 RR |
2735 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2736 | * be called with rcu_read_lock protection. | |
571ecf67 | 2737 | */ |
71ebb4aa | 2738 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2739 | struct sk_buff *skb) |
571ecf67 | 2740 | { |
554891e6 | 2741 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2742 | struct ieee80211_local *local = hw_to_local(hw); |
2743 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2744 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2745 | __le16 fc; |
5cf121c3 | 2746 | struct ieee80211_rx_data rx; |
4406c376 | 2747 | struct ieee80211_sub_if_data *prev; |
56af3268 | 2748 | struct sta_info *sta, *tmp, *prev_sta; |
e3cf8b3f | 2749 | int err = 0; |
571ecf67 | 2750 | |
e3cf8b3f | 2751 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2752 | memset(&rx, 0, sizeof(rx)); |
2753 | rx.skb = skb; | |
2754 | rx.local = local; | |
72abd81b | 2755 | |
e3cf8b3f | 2756 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2757 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2758 | |
142b9f50 HS |
2759 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2760 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
554891e6 | 2761 | status->rx_flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2762 | |
e3cf8b3f ZY |
2763 | if (ieee80211_is_mgmt(fc)) |
2764 | err = skb_linearize(skb); | |
2765 | else | |
2766 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2767 | ||
2768 | if (err) { | |
2769 | dev_kfree_skb(skb); | |
2770 | return; | |
2771 | } | |
2772 | ||
2773 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2774 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2775 | ieee80211_verify_alignment(&rx); |
38f3714d | 2776 | |
e3cf8b3f | 2777 | if (ieee80211_is_data(fc)) { |
56af3268 | 2778 | prev_sta = NULL; |
4406c376 | 2779 | |
abe60632 | 2780 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
56af3268 BG |
2781 | if (!prev_sta) { |
2782 | prev_sta = sta; | |
2783 | continue; | |
2784 | } | |
2785 | ||
2786 | rx.sta = prev_sta; | |
2787 | rx.sdata = prev_sta->sdata; | |
4406c376 | 2788 | ieee80211_prepare_and_rx_handle(&rx, skb, false); |
abe60632 | 2789 | |
56af3268 | 2790 | prev_sta = sta; |
4406c376 | 2791 | } |
56af3268 BG |
2792 | |
2793 | if (prev_sta) { | |
2794 | rx.sta = prev_sta; | |
2795 | rx.sdata = prev_sta->sdata; | |
2796 | ||
4406c376 | 2797 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
56af3268 | 2798 | return; |
8e26d5ad | 2799 | goto out; |
56af3268 | 2800 | } |
4406c376 JB |
2801 | } |
2802 | ||
4b0dd98e | 2803 | prev = NULL; |
b2e7771e | 2804 | |
4b0dd98e JB |
2805 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2806 | if (!ieee80211_sdata_running(sdata)) | |
2807 | continue; | |
340e11f3 | 2808 | |
4b0dd98e JB |
2809 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2810 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2811 | continue; | |
340e11f3 | 2812 | |
4b0dd98e JB |
2813 | /* |
2814 | * frame is destined for this interface, but if it's | |
2815 | * not also for the previous one we handle that after | |
2816 | * the loop to avoid copying the SKB once too much | |
2817 | */ | |
4bb29f8c | 2818 | |
4b0dd98e | 2819 | if (!prev) { |
abe60632 | 2820 | prev = sdata; |
4b0dd98e | 2821 | continue; |
340e11f3 | 2822 | } |
4bb29f8c | 2823 | |
4b0dd98e JB |
2824 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
2825 | rx.sdata = prev; | |
2826 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
4bb29f8c | 2827 | |
4b0dd98e JB |
2828 | prev = sdata; |
2829 | } | |
2830 | ||
2831 | if (prev) { | |
2832 | rx.sta = sta_info_get_bss(prev, hdr->addr2); | |
2833 | rx.sdata = prev; | |
4406c376 | 2834 | |
4b0dd98e JB |
2835 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
2836 | return; | |
571ecf67 | 2837 | } |
4406c376 | 2838 | |
8e26d5ad | 2839 | out: |
4406c376 | 2840 | dev_kfree_skb(skb); |
571ecf67 | 2841 | } |
6368e4b1 RR |
2842 | |
2843 | /* | |
2844 | * This is the receive path handler. It is called by a low level driver when an | |
2845 | * 802.11 MPDU is received from the hardware. | |
2846 | */ | |
103bf9f7 | 2847 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2848 | { |
2849 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2850 | struct ieee80211_rate *rate = NULL; |
2851 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2852 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2853 | |
d20ef63d JB |
2854 | WARN_ON_ONCE(softirq_count() == 0); |
2855 | ||
77a980dc JB |
2856 | if (WARN_ON(status->band < 0 || |
2857 | status->band >= IEEE80211_NUM_BANDS)) | |
2858 | goto drop; | |
8318d78a JB |
2859 | |
2860 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2861 | if (WARN_ON(!sband)) |
2862 | goto drop; | |
8318d78a | 2863 | |
89c3a8ac JB |
2864 | /* |
2865 | * If we're suspending, it is possible although not too likely | |
2866 | * that we'd be receiving frames after having already partially | |
2867 | * quiesced the stack. We can't process such frames then since | |
2868 | * that might, for example, cause stations to be added or other | |
2869 | * driver callbacks be invoked. | |
2870 | */ | |
77a980dc JB |
2871 | if (unlikely(local->quiescing || local->suspended)) |
2872 | goto drop; | |
89c3a8ac | 2873 | |
ea77f12f JB |
2874 | /* |
2875 | * The same happens when we're not even started, | |
2876 | * but that's worth a warning. | |
2877 | */ | |
77a980dc JB |
2878 | if (WARN_ON(!local->started)) |
2879 | goto drop; | |
ea77f12f | 2880 | |
fc885189 | 2881 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 2882 | /* |
fc885189 JB |
2883 | * Validate the rate, unless a PLCP error means that |
2884 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 2885 | */ |
fc885189 JB |
2886 | |
2887 | if (status->flag & RX_FLAG_HT) { | |
2888 | /* | |
2889 | * rate_idx is MCS index, which can be [0-76] | |
2890 | * as documented on: | |
2891 | * | |
2892 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2893 | * | |
2894 | * Anything else would be some sort of driver or | |
2895 | * hardware error. The driver should catch hardware | |
2896 | * errors. | |
2897 | */ | |
2898 | if (WARN((status->rate_idx < 0 || | |
2899 | status->rate_idx > 76), | |
2900 | "Rate marked as an HT rate but passed " | |
2901 | "status->rate_idx is not " | |
2902 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2903 | status->rate_idx, | |
2904 | status->rate_idx)) | |
2905 | goto drop; | |
2906 | } else { | |
2907 | if (WARN_ON(status->rate_idx < 0 || | |
2908 | status->rate_idx >= sband->n_bitrates)) | |
2909 | goto drop; | |
2910 | rate = &sband->bitrates[status->rate_idx]; | |
2911 | } | |
0fb8ca45 | 2912 | } |
6368e4b1 | 2913 | |
554891e6 JB |
2914 | status->rx_flags = 0; |
2915 | ||
6368e4b1 RR |
2916 | /* |
2917 | * key references and virtual interfaces are protected using RCU | |
2918 | * and this requires that we are in a read-side RCU section during | |
2919 | * receive processing | |
2920 | */ | |
2921 | rcu_read_lock(); | |
2922 | ||
2923 | /* | |
2924 | * Frames with failed FCS/PLCP checksum are not returned, | |
2925 | * all other frames are returned without radiotap header | |
2926 | * if it was previously present. | |
2927 | * Also, frames with less than 16 bytes are dropped. | |
2928 | */ | |
f1d58c25 | 2929 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2930 | if (!skb) { |
2931 | rcu_read_unlock(); | |
2932 | return; | |
2933 | } | |
2934 | ||
071d9ac2 | 2935 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
2936 | |
2937 | rcu_read_unlock(); | |
77a980dc JB |
2938 | |
2939 | return; | |
2940 | drop: | |
2941 | kfree_skb(skb); | |
6368e4b1 | 2942 | } |
103bf9f7 | 2943 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2944 | |
2945 | /* This is a version of the rx handler that can be called from hard irq | |
2946 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2947 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2948 | { |
2949 | struct ieee80211_local *local = hw_to_local(hw); | |
2950 | ||
2951 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2952 | ||
571ecf67 JB |
2953 | skb->pkt_type = IEEE80211_RX_MSG; |
2954 | skb_queue_tail(&local->skb_queue, skb); | |
2955 | tasklet_schedule(&local->tasklet); | |
2956 | } | |
2957 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |