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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; |
6e0d114d JB |
318 | int tid; |
319 | ||
320 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
321 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
322 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 323 | /* frame has qos control */ |
238f74a2 HH |
324 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
325 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 326 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 327 | else |
5cf121c3 | 328 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 329 | } else { |
1411f9b5 JB |
330 | /* |
331 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
332 | * | |
333 | * Sequence numbers for management frames, QoS data | |
334 | * frames with a broadcast/multicast address in the | |
335 | * Address 1 field, and all non-QoS data frames sent | |
336 | * by QoS STAs are assigned using an additional single | |
337 | * modulo-4096 counter, [...] | |
338 | * | |
339 | * We also use that counter for non-QoS STAs. | |
340 | */ | |
341 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 342 | } |
52865dfd | 343 | |
5cf121c3 | 344 | rx->queue = tid; |
6e0d114d JB |
345 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
346 | * For now, set skb->priority to 0 for other cases. */ | |
347 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 348 | } |
6e0d114d | 349 | |
d1c3a37c JB |
350 | /** |
351 | * DOC: Packet alignment | |
352 | * | |
353 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
354 | * to the stack. | |
355 | * | |
356 | * Additionally, should, if possible, align the payload data in a way that | |
357 | * guarantees that the contained IP header is aligned to a four-byte | |
358 | * boundary. In the case of regular frames, this simply means aligning the | |
359 | * payload to a four-byte boundary (because either the IP header is directly | |
360 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
361 | * in front of it). If the payload data is not properly aligned and the |
362 | * architecture doesn't support efficient unaligned operations, mac80211 | |
363 | * will align the data. | |
d1c3a37c JB |
364 | * |
365 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
366 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
367 | * push the IP header further back to a multiple of four again. Thankfully, the | |
368 | * specs were sane enough this time around to require padding each A-MSDU | |
369 | * subframe to a length that is a multiple of four. | |
370 | * | |
371 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
372 | * the payload is not supported, the driver is required to move the 802.11 | |
373 | * header to be directly in front of the payload in that case. | |
374 | */ | |
375 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 376 | { |
59d9cb07 KV |
377 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
378 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
379 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 380 | #endif |
6e0d114d JB |
381 | } |
382 | ||
6368e4b1 | 383 | |
571ecf67 JB |
384 | /* rx handlers */ |
385 | ||
49461622 | 386 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 387 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
388 | { |
389 | struct ieee80211_local *local = rx->local; | |
390 | struct sk_buff *skb = rx->skb; | |
391 | ||
fbe9c429 | 392 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 393 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 394 | |
142b9f50 HS |
395 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
396 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 397 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 398 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 399 | dev_kfree_skb(skb); |
9ae54c84 | 400 | return RX_QUEUED; |
571ecf67 JB |
401 | } |
402 | ||
5cf121c3 | 403 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
404 | /* scanning finished during invoking of handlers */ |
405 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 406 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
407 | } |
408 | ||
9ae54c84 | 409 | return RX_CONTINUE; |
571ecf67 JB |
410 | } |
411 | ||
3cfcf6ac JM |
412 | |
413 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
414 | { | |
415 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
416 | ||
417 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
418 | return 0; | |
419 | ||
420 | return ieee80211_is_robust_mgmt_frame(hdr); | |
421 | } | |
422 | ||
423 | ||
424 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
425 | { | |
426 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
427 | ||
428 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
429 | return 0; | |
430 | ||
431 | return ieee80211_is_robust_mgmt_frame(hdr); | |
432 | } | |
433 | ||
434 | ||
435 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
436 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
437 | { | |
438 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
439 | struct ieee80211_mmie *mmie; | |
440 | ||
441 | if (skb->len < 24 + sizeof(*mmie) || | |
442 | !is_multicast_ether_addr(hdr->da)) | |
443 | return -1; | |
444 | ||
445 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
446 | return -1; /* not a robust management frame */ | |
447 | ||
448 | mmie = (struct ieee80211_mmie *) | |
449 | (skb->data + skb->len - sizeof(*mmie)); | |
450 | if (mmie->element_id != WLAN_EID_MMIE || | |
451 | mmie->length != sizeof(*mmie) - 2) | |
452 | return -1; | |
453 | ||
454 | return le16_to_cpu(mmie->key_id); | |
455 | } | |
456 | ||
457 | ||
33b64eb2 | 458 | static ieee80211_rx_result |
5cf121c3 | 459 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 460 | { |
a7767f95 HH |
461 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
462 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 463 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 464 | |
a7767f95 | 465 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
466 | if (is_multicast_ether_addr(hdr->addr1)) { |
467 | if (ieee80211_has_tods(hdr->frame_control) || | |
468 | !ieee80211_has_fromds(hdr->frame_control)) | |
469 | return RX_DROP_MONITOR; | |
470 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
471 | return RX_DROP_MONITOR; | |
472 | } else { | |
473 | if (!ieee80211_has_a4(hdr->frame_control)) | |
474 | return RX_DROP_MONITOR; | |
475 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
476 | return RX_DROP_MONITOR; | |
477 | } | |
33b64eb2 LCC |
478 | } |
479 | ||
480 | /* If there is not an established peer link and this is not a peer link | |
481 | * establisment frame, beacon or probe, drop the frame. | |
482 | */ | |
483 | ||
b4e08ea1 | 484 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 485 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 486 | |
a7767f95 | 487 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
488 | return RX_DROP_MONITOR; |
489 | ||
a7767f95 | 490 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 491 | mgmt = (struct ieee80211_mgmt *)hdr; |
97ad9139 | 492 | if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK) |
33b64eb2 | 493 | return RX_DROP_MONITOR; |
33b64eb2 | 494 | return RX_CONTINUE; |
33b64eb2 LCC |
495 | } |
496 | ||
a7767f95 HH |
497 | if (ieee80211_is_probe_req(hdr->frame_control) || |
498 | ieee80211_is_probe_resp(hdr->frame_control) || | |
499 | ieee80211_is_beacon(hdr->frame_control)) | |
500 | return RX_CONTINUE; | |
501 | ||
502 | return RX_DROP_MONITOR; | |
503 | ||
504 | } | |
505 | ||
506 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
507 | ||
508 | if (ieee80211_is_data(hdr->frame_control) && | |
509 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 510 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 511 | return RX_DROP_MONITOR; |
902acc78 | 512 | #undef msh_h_get |
d6d1a5a7 | 513 | |
902acc78 JB |
514 | return RX_CONTINUE; |
515 | } | |
33b64eb2 | 516 | |
1edfb1af JB |
517 | #define SEQ_MODULO 0x1000 |
518 | #define SEQ_MASK 0xfff | |
519 | ||
520 | static inline int seq_less(u16 sq1, u16 sq2) | |
521 | { | |
522 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
523 | } | |
524 | ||
525 | static inline u16 seq_inc(u16 sq) | |
526 | { | |
527 | return (sq + 1) & SEQ_MASK; | |
528 | } | |
529 | ||
530 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
531 | { | |
532 | return (sq1 - sq2) & SEQ_MASK; | |
533 | } | |
534 | ||
535 | ||
536 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
537 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
538 | int index, |
539 | struct sk_buff_head *frames) | |
1edfb1af | 540 | { |
1edfb1af | 541 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
1edfb1af JB |
542 | |
543 | if (!skb) | |
544 | goto no_frame; | |
545 | ||
071d9ac2 | 546 | /* release the frame from the reorder ring buffer */ |
1edfb1af JB |
547 | tid_agg_rx->stored_mpdu_num--; |
548 | tid_agg_rx->reorder_buf[index] = NULL; | |
d29cecda | 549 | __skb_queue_tail(frames, skb); |
1edfb1af JB |
550 | |
551 | no_frame: | |
552 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
553 | } | |
554 | ||
555 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
556 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
557 | u16 head_seq_num, |
558 | struct sk_buff_head *frames) | |
1edfb1af JB |
559 | { |
560 | int index; | |
561 | ||
562 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
563 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
564 | tid_agg_rx->buf_size; | |
2569a826 | 565 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
566 | } |
567 | } | |
568 | ||
569 | /* | |
570 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
571 | * the skb was added to the buffer longer than this time ago, the earlier | |
572 | * frames that have not yet been received are assumed to be lost and the skb | |
573 | * can be released for processing. This may also release other skb's from the | |
574 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
575 | * |
576 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
577 | */ |
578 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
579 | ||
aa0c8636 CL |
580 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
581 | struct tid_ampdu_rx *tid_agg_rx, | |
582 | struct sk_buff_head *frames) | |
583 | { | |
2bff8ebf | 584 | int index, j; |
aa0c8636 CL |
585 | |
586 | /* release the buffer until next missing frame */ | |
587 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
588 | tid_agg_rx->buf_size; | |
589 | if (!tid_agg_rx->reorder_buf[index] && | |
590 | tid_agg_rx->stored_mpdu_num > 1) { | |
591 | /* | |
592 | * No buffers ready to be released, but check whether any | |
593 | * frames in the reorder buffer have timed out. | |
594 | */ | |
aa0c8636 CL |
595 | int skipped = 1; |
596 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
597 | j = (j + 1) % tid_agg_rx->buf_size) { | |
598 | if (!tid_agg_rx->reorder_buf[j]) { | |
599 | skipped++; | |
600 | continue; | |
601 | } | |
602 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
603 | HT_RX_REORDER_BUF_TIMEOUT)) | |
2bff8ebf | 604 | goto set_release_timer; |
aa0c8636 CL |
605 | |
606 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
607 | if (net_ratelimit()) | |
608 | printk(KERN_DEBUG "%s: release an RX reorder " | |
609 | "frame due to timeout on earlier " | |
610 | "frames\n", | |
611 | wiphy_name(hw->wiphy)); | |
612 | #endif | |
613 | ieee80211_release_reorder_frame(hw, tid_agg_rx, | |
614 | j, frames); | |
615 | ||
616 | /* | |
617 | * Increment the head seq# also for the skipped slots. | |
618 | */ | |
619 | tid_agg_rx->head_seq_num = | |
620 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
621 | skipped = 0; | |
622 | } | |
623 | } else while (tid_agg_rx->reorder_buf[index]) { | |
624 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); | |
625 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
626 | tid_agg_rx->buf_size; | |
627 | } | |
2bff8ebf CL |
628 | |
629 | if (tid_agg_rx->stored_mpdu_num) { | |
630 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
631 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
632 | ||
633 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
634 | j = (j + 1) % tid_agg_rx->buf_size) { | |
635 | if (tid_agg_rx->reorder_buf[j]) | |
636 | break; | |
637 | } | |
638 | ||
639 | set_release_timer: | |
640 | ||
641 | mod_timer(&tid_agg_rx->reorder_timer, | |
642 | tid_agg_rx->reorder_time[j] + | |
643 | HT_RX_REORDER_BUF_TIMEOUT); | |
644 | } else { | |
645 | del_timer(&tid_agg_rx->reorder_timer); | |
646 | } | |
aa0c8636 CL |
647 | } |
648 | ||
1edfb1af JB |
649 | /* |
650 | * As this function belongs to the RX path it must be under | |
651 | * rcu_read_lock protection. It returns false if the frame | |
652 | * can be processed immediately, true if it was consumed. | |
653 | */ | |
654 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
655 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
656 | struct sk_buff *skb, |
657 | struct sk_buff_head *frames) | |
1edfb1af JB |
658 | { |
659 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
660 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
661 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
662 | u16 head_seq_num, buf_size; | |
663 | int index; | |
2bff8ebf | 664 | bool ret = true; |
1edfb1af JB |
665 | |
666 | buf_size = tid_agg_rx->buf_size; | |
667 | head_seq_num = tid_agg_rx->head_seq_num; | |
668 | ||
2bff8ebf | 669 | spin_lock(&tid_agg_rx->reorder_lock); |
1edfb1af JB |
670 | /* frame with out of date sequence number */ |
671 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
672 | dev_kfree_skb(skb); | |
2bff8ebf | 673 | goto out; |
1edfb1af JB |
674 | } |
675 | ||
676 | /* | |
677 | * If frame the sequence number exceeds our buffering window | |
678 | * size release some previous frames to make room for this one. | |
679 | */ | |
680 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
681 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
682 | /* release stored frames up to new head to stack */ | |
2569a826 JB |
683 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
684 | frames); | |
1edfb1af JB |
685 | } |
686 | ||
687 | /* Now the new frame is always in the range of the reordering buffer */ | |
688 | ||
689 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
690 | ||
691 | /* check if we already stored this frame */ | |
692 | if (tid_agg_rx->reorder_buf[index]) { | |
693 | dev_kfree_skb(skb); | |
2bff8ebf | 694 | goto out; |
1edfb1af JB |
695 | } |
696 | ||
697 | /* | |
698 | * If the current MPDU is in the right order and nothing else | |
699 | * is stored we can process it directly, no need to buffer it. | |
700 | */ | |
701 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
702 | tid_agg_rx->stored_mpdu_num == 0) { | |
703 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
704 | ret = false; |
705 | goto out; | |
1edfb1af JB |
706 | } |
707 | ||
708 | /* put the frame in the reordering buffer */ | |
709 | tid_agg_rx->reorder_buf[index] = skb; | |
710 | tid_agg_rx->reorder_time[index] = jiffies; | |
711 | tid_agg_rx->stored_mpdu_num++; | |
aa0c8636 | 712 | ieee80211_sta_reorder_release(hw, tid_agg_rx, frames); |
1edfb1af | 713 | |
2bff8ebf CL |
714 | out: |
715 | spin_unlock(&tid_agg_rx->reorder_lock); | |
716 | return ret; | |
1edfb1af JB |
717 | } |
718 | ||
719 | /* | |
720 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
721 | * true if the MPDU was buffered, false if it should be processed. | |
722 | */ | |
2569a826 JB |
723 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
724 | struct sk_buff_head *frames) | |
1edfb1af | 725 | { |
2569a826 JB |
726 | struct sk_buff *skb = rx->skb; |
727 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
728 | struct ieee80211_hw *hw = &local->hw; |
729 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 730 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
731 | struct tid_ampdu_rx *tid_agg_rx; |
732 | u16 sc; | |
733 | int tid; | |
734 | ||
735 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 736 | goto dont_reorder; |
1edfb1af JB |
737 | |
738 | /* | |
739 | * filter the QoS data rx stream according to | |
740 | * STA/TID and check if this STA/TID is on aggregation | |
741 | */ | |
742 | ||
1edfb1af | 743 | if (!sta) |
2569a826 | 744 | goto dont_reorder; |
1edfb1af JB |
745 | |
746 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
747 | ||
a87f736d JB |
748 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
749 | if (!tid_agg_rx) | |
750 | goto dont_reorder; | |
1edfb1af JB |
751 | |
752 | /* qos null data frames are excluded */ | |
753 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 754 | goto dont_reorder; |
1edfb1af JB |
755 | |
756 | /* new, potentially un-ordered, ampdu frame - process it */ | |
757 | ||
758 | /* reset session timer */ | |
759 | if (tid_agg_rx->timeout) | |
760 | mod_timer(&tid_agg_rx->session_timer, | |
761 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
762 | ||
763 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
764 | sc = le16_to_cpu(hdr->seq_ctrl); | |
765 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 766 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
767 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
768 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 769 | return; |
1edfb1af JB |
770 | } |
771 | ||
a87f736d JB |
772 | /* |
773 | * No locking needed -- we will only ever process one | |
774 | * RX packet at a time, and thus own tid_agg_rx. All | |
775 | * other code manipulating it needs to (and does) make | |
776 | * sure that we cannot get to it any more before doing | |
777 | * anything with it. | |
778 | */ | |
779 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) | |
2569a826 JB |
780 | return; |
781 | ||
782 | dont_reorder: | |
783 | __skb_queue_tail(frames, skb); | |
1edfb1af | 784 | } |
33b64eb2 | 785 | |
49461622 | 786 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 787 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 788 | { |
a7767f95 | 789 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
790 | |
791 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
792 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 793 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 794 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 795 | hdr->seq_ctrl)) { |
5cf121c3 | 796 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
797 | rx->local->dot11FrameDuplicateCount++; |
798 | rx->sta->num_duplicates++; | |
799 | } | |
e4c26add | 800 | return RX_DROP_MONITOR; |
571ecf67 | 801 | } else |
5cf121c3 | 802 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
803 | } |
804 | ||
571ecf67 JB |
805 | if (unlikely(rx->skb->len < 16)) { |
806 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 807 | return RX_DROP_MONITOR; |
571ecf67 JB |
808 | } |
809 | ||
571ecf67 JB |
810 | /* Drop disallowed frame classes based on STA auth/assoc state; |
811 | * IEEE 802.11, Chap 5.5. | |
812 | * | |
ccd7b362 JB |
813 | * mac80211 filters only based on association state, i.e. it drops |
814 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
815 | * deauth/disassoc frames when needed. In addition, hostapd is |
816 | * responsible for filtering on both auth and assoc states. | |
817 | */ | |
33b64eb2 | 818 | |
902acc78 | 819 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 820 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 821 | |
a7767f95 HH |
822 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
823 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 824 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 825 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
826 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
827 | !ieee80211_has_tods(hdr->frame_control) && | |
828 | ieee80211_is_data(hdr->frame_control)) || | |
829 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
830 | /* Drop IBSS frames and frames for other hosts |
831 | * silently. */ | |
e4c26add | 832 | return RX_DROP_MONITOR; |
571ecf67 JB |
833 | } |
834 | ||
e4c26add | 835 | return RX_DROP_MONITOR; |
571ecf67 JB |
836 | } |
837 | ||
9ae54c84 | 838 | return RX_CONTINUE; |
570bd537 JB |
839 | } |
840 | ||
841 | ||
49461622 | 842 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 843 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 844 | { |
eb9fb5b8 JB |
845 | struct sk_buff *skb = rx->skb; |
846 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
847 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
848 | int keyidx; |
849 | int hdrlen; | |
e4c26add | 850 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 851 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 852 | int mmie_keyidx = -1; |
761ab470 | 853 | __le16 fc; |
570bd537 | 854 | |
3017b80b JB |
855 | /* |
856 | * Key selection 101 | |
857 | * | |
3cfcf6ac | 858 | * There are four types of keys: |
3017b80b | 859 | * - GTK (group keys) |
3cfcf6ac | 860 | * - IGTK (group keys for management frames) |
3017b80b JB |
861 | * - PTK (pairwise keys) |
862 | * - STK (station-to-station pairwise keys) | |
863 | * | |
864 | * When selecting a key, we have to distinguish between multicast | |
865 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
866 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
867 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
868 | * unicast frames can also use key indices like GTKs. Hence, if we | |
869 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 870 | * |
8dc06a1c JB |
871 | * Note that in a regular BSS, multicast frames are sent by the |
872 | * AP only, associated stations unicast the frame to the AP first | |
873 | * which then multicasts it on their behalf. | |
874 | * | |
3017b80b JB |
875 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
876 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
877 | * The spec seems to expect that one negotiates the same key with |
878 | * every station but there's no such requirement; VLANs could be | |
879 | * possible. | |
3017b80b JB |
880 | */ |
881 | ||
3017b80b | 882 | /* |
1990af8d | 883 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
884 | * addressed to us nor a multicast frame. |
885 | */ | |
5cf121c3 | 886 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 887 | return RX_CONTINUE; |
3017b80b | 888 | |
2569a826 JB |
889 | /* start without a key */ |
890 | rx->key = NULL; | |
891 | ||
d4e46a3d JB |
892 | if (rx->sta) |
893 | stakey = rcu_dereference(rx->sta->key); | |
894 | ||
761ab470 JB |
895 | fc = hdr->frame_control; |
896 | ||
897 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
898 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
899 | ||
d4e46a3d JB |
900 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
901 | rx->key = stakey; | |
dc1580dd JB |
902 | if ((status->flag & RX_FLAG_DECRYPTED) && |
903 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
904 | return RX_CONTINUE; | |
0c7c10c7 | 905 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 906 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 907 | return RX_CONTINUE; |
3cfcf6ac JM |
908 | } else if (mmie_keyidx >= 0) { |
909 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
910 | if ((status->flag & RX_FLAG_DECRYPTED) && |
911 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
912 | return RX_CONTINUE; |
913 | ||
914 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
915 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
916 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
917 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 918 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
919 | /* |
920 | * The frame was not protected, so skip decryption. However, we | |
921 | * need to set rx->key if there is a key that could have been | |
922 | * used so that the frame may be dropped if encryption would | |
923 | * have been expected. | |
924 | */ | |
925 | struct ieee80211_key *key = NULL; | |
761ab470 | 926 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
927 | is_multicast_ether_addr(hdr->addr1) && |
928 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
929 | rx->key = key; | |
930 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
931 | rx->key = key; | |
932 | return RX_CONTINUE; | |
571ecf67 | 933 | } else { |
39184b15 | 934 | u8 keyid; |
3017b80b JB |
935 | /* |
936 | * The device doesn't give us the IV so we won't be | |
937 | * able to look up the key. That's ok though, we | |
938 | * don't need to decrypt the frame, we just won't | |
939 | * be able to keep statistics accurate. | |
940 | * Except for key threshold notifications, should | |
941 | * we somehow allow the driver to tell us which key | |
942 | * the hardware used if this flag is set? | |
943 | */ | |
eb9fb5b8 JB |
944 | if ((status->flag & RX_FLAG_DECRYPTED) && |
945 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 946 | return RX_CONTINUE; |
3017b80b | 947 | |
761ab470 | 948 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
949 | |
950 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 951 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
952 | |
953 | /* | |
954 | * no need to call ieee80211_wep_get_keyidx, | |
955 | * it verifies a bunch of things we've done already | |
956 | */ | |
39184b15 ZY |
957 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
958 | keyidx = keyid >> 6; | |
3017b80b | 959 | |
d4e46a3d | 960 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
961 | |
962 | /* | |
963 | * RSNA-protected unicast frames should always be sent with | |
964 | * pairwise or station-to-station keys, but for WEP we allow | |
965 | * using a key index as well. | |
966 | */ | |
97359d12 JB |
967 | if (rx->key && rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && |
968 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
3017b80b JB |
969 | !is_multicast_ether_addr(hdr->addr1)) |
970 | rx->key = NULL; | |
571ecf67 JB |
971 | } |
972 | ||
3017b80b | 973 | if (rx->key) { |
571ecf67 | 974 | rx->key->tx_rx_count++; |
011bfcc4 | 975 | /* TODO: add threshold stuff again */ |
1990af8d | 976 | } else { |
e4c26add | 977 | return RX_DROP_MONITOR; |
70f08765 JB |
978 | } |
979 | ||
39184b15 ZY |
980 | if (skb_linearize(rx->skb)) |
981 | return RX_DROP_UNUSABLE; | |
761ab470 | 982 | /* the hdr variable is invalid now! */ |
1990af8d | 983 | |
97359d12 JB |
984 | switch (rx->key->conf.cipher) { |
985 | case WLAN_CIPHER_SUITE_WEP40: | |
986 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
987 | /* Check for weak IVs if possible */ |
988 | if (rx->sta && ieee80211_is_data(fc) && | |
989 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
990 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
991 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
992 | rx->sta->wep_weak_iv_count++; | |
993 | ||
e2f036da MN |
994 | result = ieee80211_crypto_wep_decrypt(rx); |
995 | break; | |
97359d12 | 996 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
997 | result = ieee80211_crypto_tkip_decrypt(rx); |
998 | break; | |
97359d12 | 999 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1000 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1001 | break; | |
97359d12 | 1002 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1003 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1004 | break; | |
70f08765 JB |
1005 | } |
1006 | ||
e2f036da | 1007 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1008 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1009 | |
1010 | return result; | |
70f08765 JB |
1011 | } |
1012 | ||
572e0012 KV |
1013 | static ieee80211_rx_result debug_noinline |
1014 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1015 | { | |
1016 | struct ieee80211_local *local; | |
1017 | struct ieee80211_hdr *hdr; | |
1018 | struct sk_buff *skb; | |
1019 | ||
1020 | local = rx->local; | |
1021 | skb = rx->skb; | |
1022 | hdr = (struct ieee80211_hdr *) skb->data; | |
1023 | ||
1024 | if (!local->pspolling) | |
1025 | return RX_CONTINUE; | |
1026 | ||
1027 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1028 | /* this is not from AP */ | |
1029 | return RX_CONTINUE; | |
1030 | ||
1031 | if (!ieee80211_is_data(hdr->frame_control)) | |
1032 | return RX_CONTINUE; | |
1033 | ||
1034 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1035 | /* AP has no more frames buffered for us */ | |
1036 | local->pspolling = false; | |
1037 | return RX_CONTINUE; | |
1038 | } | |
1039 | ||
1040 | /* more data bit is set, let's request a new frame from the AP */ | |
1041 | ieee80211_send_pspoll(local, rx->sdata); | |
1042 | ||
1043 | return RX_CONTINUE; | |
1044 | } | |
1045 | ||
133b8226 | 1046 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1047 | { |
133b8226 | 1048 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1049 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1050 | |
3e122be0 | 1051 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1052 | set_sta_flags(sta, WLAN_STA_PS_STA); |
12375ef9 | 1053 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1054 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1055 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1056 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1057 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1058 | } | |
1059 | ||
ff9458d3 | 1060 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1061 | { |
133b8226 | 1062 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1063 | |
3e122be0 | 1064 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1065 | |
af818581 | 1066 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
004c872e | 1067 | |
571ecf67 | 1068 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1069 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1070 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1071 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1072 | |
af818581 | 1073 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1074 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1075 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1076 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1077 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1078 | return; |
1079 | } | |
1080 | ||
1081 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1082 | } |
1083 | ||
49461622 | 1084 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1085 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1086 | { |
1087 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1088 | struct sk_buff *skb = rx->skb; |
1089 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1090 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1091 | |
1092 | if (!sta) | |
9ae54c84 | 1093 | return RX_CONTINUE; |
571ecf67 | 1094 | |
b291ba11 JB |
1095 | /* |
1096 | * Update last_rx only for IBSS packets which are for the current | |
1097 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1098 | * where other STAs start using different BSSID. | |
1099 | */ | |
05c914fe | 1100 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1101 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1102 | NL80211_IFTYPE_ADHOC); |
46900298 | 1103 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1104 | sta->last_rx = jiffies; |
b291ba11 JB |
1105 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1106 | /* | |
33b64eb2 LCC |
1107 | * Mesh beacons will update last_rx when if they are found to |
1108 | * match the current local configuration when processed. | |
571ecf67 | 1109 | */ |
b291ba11 | 1110 | sta->last_rx = jiffies; |
571ecf67 JB |
1111 | } |
1112 | ||
5cf121c3 | 1113 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1114 | return RX_CONTINUE; |
571ecf67 | 1115 | |
3cf335d5 KV |
1116 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1117 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1118 | ||
571ecf67 JB |
1119 | sta->rx_fragments++; |
1120 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1121 | sta->last_signal = status->signal; |
571ecf67 | 1122 | |
72eaa43a JB |
1123 | /* |
1124 | * Change STA power saving mode only at the end of a frame | |
1125 | * exchange sequence. | |
1126 | */ | |
3e122be0 | 1127 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
1128 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1129 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1130 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1131 | /* |
1132 | * Ignore doze->wake transitions that are | |
1133 | * indicated by non-data frames, the standard | |
1134 | * is unclear here, but for example going to | |
1135 | * PS mode and then scanning would cause a | |
1136 | * doze->wake transition for the probe request, | |
1137 | * and that is clearly undesirable. | |
1138 | */ | |
1139 | if (ieee80211_is_data(hdr->frame_control) && | |
1140 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1141 | ap_sta_ps_end(sta); |
72eaa43a JB |
1142 | } else { |
1143 | if (ieee80211_has_pm(hdr->frame_control)) | |
1144 | ap_sta_ps_start(sta); | |
1145 | } | |
571ecf67 JB |
1146 | } |
1147 | ||
22403def JB |
1148 | /* |
1149 | * Drop (qos-)data::nullfunc frames silently, since they | |
1150 | * are used only to control station power saving mode. | |
1151 | */ | |
1152 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1153 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1154 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1155 | |
1156 | /* | |
1157 | * If we receive a 4-addr nullfunc frame from a STA | |
1158 | * that was not moved to a 4-addr STA vlan yet, drop | |
1159 | * the frame to the monitor interface, to make sure | |
1160 | * that hostapd sees it | |
1161 | */ | |
1162 | if (ieee80211_has_a4(hdr->frame_control) && | |
1163 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1164 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1165 | !rx->sdata->u.vlan.sta))) | |
1166 | return RX_DROP_MONITOR; | |
22403def JB |
1167 | /* |
1168 | * Update counter and free packet here to avoid | |
1169 | * counting this as a dropped packed. | |
1170 | */ | |
571ecf67 JB |
1171 | sta->rx_packets++; |
1172 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1173 | return RX_QUEUED; |
571ecf67 JB |
1174 | } |
1175 | ||
9ae54c84 | 1176 | return RX_CONTINUE; |
571ecf67 JB |
1177 | } /* ieee80211_rx_h_sta_process */ |
1178 | ||
571ecf67 JB |
1179 | static inline struct ieee80211_fragment_entry * |
1180 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1181 | unsigned int frag, unsigned int seq, int rx_queue, | |
1182 | struct sk_buff **skb) | |
1183 | { | |
1184 | struct ieee80211_fragment_entry *entry; | |
1185 | int idx; | |
1186 | ||
1187 | idx = sdata->fragment_next; | |
1188 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1189 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1190 | sdata->fragment_next = 0; | |
1191 | ||
1192 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1193 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1194 | struct ieee80211_hdr *hdr = |
1195 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1196 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1197 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1198 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1199 | sdata->name, idx, |
571ecf67 | 1200 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1201 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1202 | #endif |
571ecf67 JB |
1203 | __skb_queue_purge(&entry->skb_list); |
1204 | } | |
1205 | ||
1206 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1207 | *skb = NULL; | |
1208 | entry->first_frag_time = jiffies; | |
1209 | entry->seq = seq; | |
1210 | entry->rx_queue = rx_queue; | |
1211 | entry->last_frag = frag; | |
1212 | entry->ccmp = 0; | |
1213 | entry->extra_len = 0; | |
1214 | ||
1215 | return entry; | |
1216 | } | |
1217 | ||
1218 | static inline struct ieee80211_fragment_entry * | |
1219 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1220 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1221 | int rx_queue, struct ieee80211_hdr *hdr) |
1222 | { | |
1223 | struct ieee80211_fragment_entry *entry; | |
1224 | int i, idx; | |
1225 | ||
1226 | idx = sdata->fragment_next; | |
1227 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1228 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1229 | |
1230 | idx--; | |
1231 | if (idx < 0) | |
1232 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1233 | ||
1234 | entry = &sdata->fragments[idx]; | |
1235 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1236 | entry->rx_queue != rx_queue || | |
1237 | entry->last_frag + 1 != frag) | |
1238 | continue; | |
1239 | ||
b73d70ad | 1240 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1241 | |
b73d70ad HH |
1242 | /* |
1243 | * Check ftype and addresses are equal, else check next fragment | |
1244 | */ | |
1245 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1246 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1247 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1248 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1249 | continue; | |
1250 | ||
ab46623e | 1251 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1252 | __skb_queue_purge(&entry->skb_list); |
1253 | continue; | |
1254 | } | |
1255 | return entry; | |
1256 | } | |
1257 | ||
1258 | return NULL; | |
1259 | } | |
1260 | ||
49461622 | 1261 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1262 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1263 | { |
1264 | struct ieee80211_hdr *hdr; | |
1265 | u16 sc; | |
358c8d9d | 1266 | __le16 fc; |
571ecf67 JB |
1267 | unsigned int frag, seq; |
1268 | struct ieee80211_fragment_entry *entry; | |
1269 | struct sk_buff *skb; | |
1270 | ||
b73d70ad | 1271 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1272 | fc = hdr->frame_control; |
571ecf67 JB |
1273 | sc = le16_to_cpu(hdr->seq_ctrl); |
1274 | frag = sc & IEEE80211_SCTL_FRAG; | |
1275 | ||
358c8d9d | 1276 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1277 | (rx->skb)->len < 24 || |
1278 | is_multicast_ether_addr(hdr->addr1))) { | |
1279 | /* not fragmented */ | |
1280 | goto out; | |
1281 | } | |
1282 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1283 | ||
e3cf8b3f ZY |
1284 | if (skb_linearize(rx->skb)) |
1285 | return RX_DROP_UNUSABLE; | |
1286 | ||
058897a4 AK |
1287 | /* |
1288 | * skb_linearize() might change the skb->data and | |
1289 | * previously cached variables (in this case, hdr) need to | |
1290 | * be refreshed with the new data. | |
1291 | */ | |
1292 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1293 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1294 | ||
1295 | if (frag == 0) { | |
1296 | /* This is the first fragment of a new frame. */ | |
1297 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1298 | rx->queue, &(rx->skb)); |
97359d12 | 1299 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1300 | ieee80211_has_protected(fc)) { |
9190252c JM |
1301 | int queue = ieee80211_is_mgmt(fc) ? |
1302 | NUM_RX_DATA_QUEUES : rx->queue; | |
571ecf67 JB |
1303 | /* Store CCMP PN so that we can verify that the next |
1304 | * fragment has a sequential PN value. */ | |
1305 | entry->ccmp = 1; | |
1306 | memcpy(entry->last_pn, | |
9190252c | 1307 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1308 | CCMP_PN_LEN); |
1309 | } | |
9ae54c84 | 1310 | return RX_QUEUED; |
571ecf67 JB |
1311 | } |
1312 | ||
1313 | /* This is a fragment for a frame that should already be pending in | |
1314 | * fragment cache. Add this fragment to the end of the pending entry. | |
1315 | */ | |
b73d70ad | 1316 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1317 | if (!entry) { |
1318 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1319 | return RX_DROP_MONITOR; |
571ecf67 JB |
1320 | } |
1321 | ||
1322 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1323 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1324 | if (entry->ccmp) { | |
1325 | int i; | |
1326 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1327 | int queue; |
97359d12 | 1328 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1329 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1330 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1331 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1332 | pn[i]++; | |
1333 | if (pn[i]) | |
1334 | break; | |
1335 | } | |
9190252c JM |
1336 | queue = ieee80211_is_mgmt(fc) ? |
1337 | NUM_RX_DATA_QUEUES : rx->queue; | |
1338 | rpn = rx->key->u.ccmp.rx_pn[queue]; | |
f4ea83dd | 1339 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1340 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1341 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1342 | } | |
1343 | ||
358c8d9d | 1344 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1345 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1346 | entry->last_frag = frag; | |
1347 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1348 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1349 | rx->skb = NULL; |
9ae54c84 | 1350 | return RX_QUEUED; |
571ecf67 JB |
1351 | } |
1352 | ||
1353 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1354 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1355 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1356 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1357 | GFP_ATOMIC))) { | |
1358 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1359 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1360 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1361 | } |
1362 | } | |
1363 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1364 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1365 | dev_kfree_skb(skb); | |
1366 | } | |
1367 | ||
1368 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1369 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1370 | |
1371 | out: | |
1372 | if (rx->sta) | |
1373 | rx->sta->rx_packets++; | |
1374 | if (is_multicast_ether_addr(hdr->addr1)) | |
1375 | rx->local->dot11MulticastReceivedFrameCount++; | |
1376 | else | |
1377 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1378 | return RX_CONTINUE; |
571ecf67 JB |
1379 | } |
1380 | ||
49461622 | 1381 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1382 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1383 | { |
af818581 | 1384 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1385 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1386 | |
358c8d9d | 1387 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1388 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1389 | return RX_CONTINUE; |
571ecf67 | 1390 | |
05c914fe JB |
1391 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1392 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1393 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1394 | |
af818581 JB |
1395 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1396 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1397 | else | |
1398 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1399 | |
9ae54c84 | 1400 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1401 | * count as an dropped frame. */ |
1402 | dev_kfree_skb(rx->skb); | |
1403 | ||
9ae54c84 | 1404 | return RX_QUEUED; |
571ecf67 JB |
1405 | } |
1406 | ||
49461622 | 1407 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1408 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1409 | { |
6e0d114d | 1410 | u8 *data = rx->skb->data; |
238f74a2 | 1411 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1412 | |
238f74a2 | 1413 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1414 | return RX_CONTINUE; |
6e0d114d JB |
1415 | |
1416 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1417 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1418 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1419 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1420 | /* change frame type to non QOS */ |
238f74a2 | 1421 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1422 | |
9ae54c84 | 1423 | return RX_CONTINUE; |
6e0d114d JB |
1424 | } |
1425 | ||
76ee65bf | 1426 | static int |
5cf121c3 | 1427 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1428 | { |
07346f81 | 1429 | if (unlikely(!rx->sta || |
f4ea83dd | 1430 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1431 | return -EACCES; |
571ecf67 | 1432 | |
76ee65bf | 1433 | return 0; |
571ecf67 JB |
1434 | } |
1435 | ||
76ee65bf | 1436 | static int |
358c8d9d | 1437 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1438 | { |
eb9fb5b8 JB |
1439 | struct sk_buff *skb = rx->skb; |
1440 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1441 | ||
3017b80b | 1442 | /* |
7848ba7d JB |
1443 | * Pass through unencrypted frames if the hardware has |
1444 | * decrypted them already. | |
3017b80b | 1445 | */ |
eb9fb5b8 | 1446 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1447 | return 0; |
571ecf67 JB |
1448 | |
1449 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1450 | if (unlikely(!ieee80211_has_protected(fc) && |
1451 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1452 | ieee80211_is_data(fc) && |
b3fc9c6c | 1453 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1454 | return -EACCES; |
bef5d1c7 JB |
1455 | |
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | static int | |
1460 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1461 | { | |
1462 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1463 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1464 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1465 | |
e3efca0a JM |
1466 | /* |
1467 | * Pass through unencrypted frames if the hardware has | |
1468 | * decrypted them already. | |
1469 | */ | |
1470 | if (status->flag & RX_FLAG_DECRYPTED) | |
1471 | return 0; | |
bef5d1c7 | 1472 | |
f2ca3ea4 | 1473 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1474 | if (unlikely(!ieee80211_has_protected(fc) && |
1475 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
f2ca3ea4 JM |
1476 | rx->key)) |
1477 | return -EACCES; | |
1478 | /* BIP does not use Protected field, so need to check MMIE */ | |
f64f9e71 | 1479 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
fa83a218 | 1480 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) |
f2ca3ea4 JM |
1481 | return -EACCES; |
1482 | /* | |
1483 | * When using MFP, Action frames are not allowed prior to | |
1484 | * having configured keys. | |
1485 | */ | |
1486 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1487 | ieee80211_is_robust_mgmt_frame( | |
1488 | (struct ieee80211_hdr *) rx->skb->data))) | |
1489 | return -EACCES; | |
1490 | } | |
b3fc9c6c | 1491 | |
76ee65bf | 1492 | return 0; |
571ecf67 JB |
1493 | } |
1494 | ||
76ee65bf | 1495 | static int |
e31a16d6 | 1496 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1497 | { |
eb9fb5b8 | 1498 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee FF |
1499 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1500 | ||
9bc383de JB |
1501 | if (ieee80211_has_a4(hdr->frame_control) && |
1502 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1503 | return -1; |
9bc383de JB |
1504 | |
1505 | if (is_multicast_ether_addr(hdr->addr1) && | |
1506 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1507 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1508 | return -1; |
571ecf67 | 1509 | |
47846c9b | 1510 | return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
76ee65bf | 1511 | } |
571ecf67 | 1512 | |
ce3edf6d JB |
1513 | /* |
1514 | * requires that rx->skb is a frame with ethernet header | |
1515 | */ | |
358c8d9d | 1516 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1517 | { |
c97c23e3 | 1518 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1519 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1520 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1521 | ||
1522 | /* | |
1523 | * Allow EAPOL frames to us/the PAE group address regardless | |
1524 | * of whether the frame was encrypted or not. | |
1525 | */ | |
1526 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
47846c9b | 1527 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1528 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1529 | return true; | |
1530 | ||
1531 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1532 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1533 | return false; |
1534 | ||
1535 | return true; | |
1536 | } | |
1537 | ||
1538 | /* | |
1539 | * requires that rx->skb is a frame with ethernet header | |
1540 | */ | |
76ee65bf | 1541 | static void |
5cf121c3 | 1542 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1543 | { |
eb9fb5b8 JB |
1544 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1545 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1546 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1547 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1548 | struct sta_info *dsta; | |
571ecf67 | 1549 | |
76ee65bf RR |
1550 | skb = rx->skb; |
1551 | xmit_skb = NULL; | |
571ecf67 | 1552 | |
05c914fe JB |
1553 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1554 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1555 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
9bc383de JB |
1556 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
1557 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
ce3edf6d JB |
1558 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1559 | /* | |
1560 | * send multicast frames both to higher layers in | |
1561 | * local net stack and back to the wireless medium | |
1562 | */ | |
76ee65bf RR |
1563 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1564 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1565 | printk(KERN_DEBUG "%s: failed to clone " |
1566 | "multicast frame\n", dev->name); | |
1567 | } else { | |
abe60632 JB |
1568 | dsta = sta_info_get(sdata, skb->data); |
1569 | if (dsta) { | |
ce3edf6d JB |
1570 | /* |
1571 | * The destination station is associated to | |
1572 | * this AP (in this VLAN), so send the frame | |
1573 | * directly to it and do not pass it to local | |
1574 | * net stack. | |
571ecf67 | 1575 | */ |
76ee65bf | 1576 | xmit_skb = skb; |
571ecf67 JB |
1577 | skb = NULL; |
1578 | } | |
571ecf67 JB |
1579 | } |
1580 | } | |
1581 | ||
1582 | if (skb) { | |
d1c3a37c JB |
1583 | int align __maybe_unused; |
1584 | ||
59d9cb07 | 1585 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1586 | /* |
1587 | * 'align' will only take the values 0 or 2 here | |
1588 | * since all frames are required to be aligned | |
1589 | * to 2-byte boundaries when being passed to | |
1590 | * mac80211. That also explains the __skb_push() | |
1591 | * below. | |
1592 | */ | |
dacb6f1d | 1593 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1594 | if (align) { |
1595 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1596 | dev_kfree_skb(skb); | |
1597 | skb = NULL; | |
1598 | } else { | |
1599 | u8 *data = skb->data; | |
8ce0b589 ZY |
1600 | size_t len = skb_headlen(skb); |
1601 | skb->data -= align; | |
1602 | memmove(skb->data, data, len); | |
1603 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1604 | } |
1605 | } | |
1606 | #endif | |
1607 | ||
1608 | if (skb) { | |
1609 | /* deliver to local stack */ | |
1610 | skb->protocol = eth_type_trans(skb, dev); | |
1611 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1612 | netif_receive_skb(skb); |
d1c3a37c | 1613 | } |
571ecf67 JB |
1614 | } |
1615 | ||
76ee65bf | 1616 | if (xmit_skb) { |
571ecf67 | 1617 | /* send to wireless media */ |
f831e909 | 1618 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1619 | skb_reset_network_header(xmit_skb); |
1620 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1621 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1622 | } |
76ee65bf RR |
1623 | } |
1624 | ||
49461622 | 1625 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1626 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1627 | { |
eb9fb5b8 | 1628 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1629 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1630 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1631 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1632 | struct sk_buff_head frame_list; |
fd4c7f2f | 1633 | |
358c8d9d | 1634 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1635 | return RX_CONTINUE; |
fd4c7f2f | 1636 | |
358c8d9d | 1637 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1638 | return RX_DROP_MONITOR; |
fd4c7f2f | 1639 | |
5cf121c3 | 1640 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1641 | return RX_CONTINUE; |
fd4c7f2f | 1642 | |
eaf85ca7 ZY |
1643 | if (ieee80211_has_a4(hdr->frame_control) && |
1644 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1645 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1646 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1647 | |
eaf85ca7 ZY |
1648 | if (is_multicast_ether_addr(hdr->addr1) && |
1649 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1650 | rx->sdata->u.vlan.sta) || | |
1651 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1652 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1653 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1654 | |
eaf85ca7 ZY |
1655 | skb->dev = dev; |
1656 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1657 | |
e3cf8b3f ZY |
1658 | if (skb_linearize(skb)) |
1659 | return RX_DROP_UNUSABLE; | |
1660 | ||
eaf85ca7 ZY |
1661 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1662 | rx->sdata->vif.type, | |
1663 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1664 | |
eaf85ca7 ZY |
1665 | while (!skb_queue_empty(&frame_list)) { |
1666 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1667 | |
358c8d9d | 1668 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1669 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1670 | continue; |
1671 | } | |
eaf85ca7 ZY |
1672 | dev->stats.rx_packets++; |
1673 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1674 | |
1675 | ieee80211_deliver_skb(rx); | |
1676 | } | |
1677 | ||
9ae54c84 | 1678 | return RX_QUEUED; |
fd4c7f2f RR |
1679 | } |
1680 | ||
bf94e17b | 1681 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1682 | static ieee80211_rx_result |
e32f85f7 LCC |
1683 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1684 | { | |
1685 | struct ieee80211_hdr *hdr; | |
1686 | struct ieee80211s_hdr *mesh_hdr; | |
1687 | unsigned int hdrlen; | |
1688 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1689 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1690 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e32f85f7 LCC |
1691 | |
1692 | hdr = (struct ieee80211_hdr *) skb->data; | |
1693 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1694 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1695 | ||
1696 | if (!ieee80211_is_data(hdr->frame_control)) | |
1697 | return RX_CONTINUE; | |
1698 | ||
1699 | if (!mesh_hdr->ttl) | |
1700 | /* illegal frame */ | |
1701 | return RX_DROP_MONITOR; | |
1702 | ||
43b7b314 | 1703 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1704 | struct mesh_path *mppath; |
43b7b314 JC |
1705 | char *proxied_addr; |
1706 | char *mpp_addr; | |
1707 | ||
1708 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1709 | mpp_addr = hdr->addr3; | |
1710 | proxied_addr = mesh_hdr->eaddr1; | |
1711 | } else { | |
1712 | mpp_addr = hdr->addr4; | |
1713 | proxied_addr = mesh_hdr->eaddr2; | |
1714 | } | |
79617dee | 1715 | |
79617dee | 1716 | rcu_read_lock(); |
43b7b314 | 1717 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1718 | if (!mppath) { |
43b7b314 | 1719 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1720 | } else { |
1721 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1722 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1723 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1724 | spin_unlock_bh(&mppath->state_lock); |
1725 | } | |
1726 | rcu_read_unlock(); | |
1727 | } | |
1728 | ||
3c5772a5 JC |
1729 | /* Frame has reached destination. Don't forward */ |
1730 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1731 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1732 | return RX_CONTINUE; |
1733 | ||
1734 | mesh_hdr->ttl--; | |
1735 | ||
1736 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1737 | if (!mesh_hdr->ttl) | |
472dbc45 | 1738 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1739 | dropped_frames_ttl); |
1740 | else { | |
1741 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1742 | struct ieee80211_tx_info *info; |
1743 | ||
e32f85f7 LCC |
1744 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1745 | ||
1746 | if (!fwd_skb && net_ratelimit()) | |
1747 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1748 | sdata->name); |
e32f85f7 LCC |
1749 | |
1750 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1751 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1752 | info = IEEE80211_SKB_CB(fwd_skb); |
1753 | memset(info, 0, sizeof(*info)); | |
1754 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1755 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1756 | skb_set_queue_mapping(skb, |
1757 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1758 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1759 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1760 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1761 | fwded_mcast); | |
1762 | else { | |
3c5772a5 JC |
1763 | int err; |
1764 | /* | |
1765 | * Save TA to addr1 to send TA a path error if a | |
1766 | * suitable next hop is not found | |
1767 | */ | |
1768 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1769 | ETH_ALEN); |
3c5772a5 | 1770 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1771 | /* Failed to immediately resolve next hop: |
1772 | * fwded frame was dropped or will be added | |
1773 | * later to the pending skb queue. */ | |
1774 | if (err) | |
1775 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1776 | |
1777 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1778 | fwded_unicast); | |
249b405c JC |
1779 | } |
1780 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1781 | fwded_frames); | |
3b8d81e0 | 1782 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1783 | } |
1784 | } | |
1785 | ||
3c5772a5 | 1786 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1787 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1788 | return RX_CONTINUE; |
1789 | else | |
1790 | return RX_DROP_MONITOR; | |
1791 | } | |
bf94e17b | 1792 | #endif |
e32f85f7 | 1793 | |
49461622 | 1794 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1795 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1796 | { |
eb9fb5b8 | 1797 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1798 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1799 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1800 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1801 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1802 | int err; |
76ee65bf | 1803 | |
358c8d9d | 1804 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1805 | return RX_CONTINUE; |
76ee65bf | 1806 | |
358c8d9d | 1807 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1808 | return RX_DROP_MONITOR; |
76ee65bf | 1809 | |
f14543ee FF |
1810 | /* |
1811 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1812 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1813 | */ | |
1814 | if (ieee80211_has_a4(hdr->frame_control) && | |
1815 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1816 | return RX_DROP_MONITOR; | |
1817 | ||
e31a16d6 | 1818 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1819 | if (unlikely(err)) |
e4c26add | 1820 | return RX_DROP_UNUSABLE; |
76ee65bf | 1821 | |
358c8d9d | 1822 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1823 | return RX_DROP_MONITOR; |
ce3edf6d | 1824 | |
76ee65bf RR |
1825 | rx->skb->dev = dev; |
1826 | ||
1827 | dev->stats.rx_packets++; | |
1828 | dev->stats.rx_bytes += rx->skb->len; | |
1829 | ||
e15276a4 VN |
1830 | if (ieee80211_is_data(hdr->frame_control) && |
1831 | !is_multicast_ether_addr(hdr->addr1) && | |
1832 | local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) { | |
1833 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
1834 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1835 | } | |
1836 | ||
76ee65bf | 1837 | ieee80211_deliver_skb(rx); |
571ecf67 | 1838 | |
9ae54c84 | 1839 | return RX_QUEUED; |
571ecf67 JB |
1840 | } |
1841 | ||
49461622 | 1842 | static ieee80211_rx_result debug_noinline |
2569a826 | 1843 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
71364716 RR |
1844 | { |
1845 | struct ieee80211_local *local = rx->local; | |
1846 | struct ieee80211_hw *hw = &local->hw; | |
1847 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1848 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1849 | struct tid_ampdu_rx *tid_agg_rx; |
1850 | u16 start_seq_num; | |
1851 | u16 tid; | |
1852 | ||
a7767f95 | 1853 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1854 | return RX_CONTINUE; |
71364716 | 1855 | |
a7767f95 | 1856 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
1857 | struct { |
1858 | __le16 control, start_seq_num; | |
1859 | } __packed bar_data; | |
1860 | ||
71364716 | 1861 | if (!rx->sta) |
a02ae758 | 1862 | return RX_DROP_MONITOR; |
8ae5977f JB |
1863 | |
1864 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
1865 | &bar_data, sizeof(bar_data))) | |
1866 | return RX_DROP_MONITOR; | |
1867 | ||
8ae5977f | 1868 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
1869 | |
1870 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
1871 | if (!tid_agg_rx) | |
a02ae758 | 1872 | return RX_DROP_MONITOR; |
71364716 | 1873 | |
8ae5977f | 1874 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
1875 | |
1876 | /* reset session timer */ | |
20ad19d0 JB |
1877 | if (tid_agg_rx->timeout) |
1878 | mod_timer(&tid_agg_rx->session_timer, | |
1879 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1880 | |
a02ae758 | 1881 | /* release stored frames up to start of BAR */ |
2569a826 JB |
1882 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
1883 | frames); | |
a02ae758 JB |
1884 | kfree_skb(skb); |
1885 | return RX_QUEUED; | |
71364716 RR |
1886 | } |
1887 | ||
08daecae JB |
1888 | /* |
1889 | * After this point, we only want management frames, | |
1890 | * so we can drop all remaining control frames to | |
1891 | * cooked monitor interfaces. | |
1892 | */ | |
1893 | return RX_DROP_MONITOR; | |
71364716 RR |
1894 | } |
1895 | ||
f4f727a6 JM |
1896 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1897 | struct ieee80211_mgmt *mgmt, | |
1898 | size_t len) | |
fea14732 JM |
1899 | { |
1900 | struct ieee80211_local *local = sdata->local; | |
1901 | struct sk_buff *skb; | |
1902 | struct ieee80211_mgmt *resp; | |
1903 | ||
47846c9b | 1904 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
1905 | /* Not to own unicast address */ |
1906 | return; | |
1907 | } | |
1908 | ||
46900298 JB |
1909 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1910 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1911 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1912 | return; |
1913 | } | |
1914 | ||
1915 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1916 | /* Too short SA Query request frame */ | |
1917 | return; | |
1918 | } | |
1919 | ||
1920 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1921 | if (skb == NULL) | |
1922 | return; | |
1923 | ||
1924 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1925 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1926 | memset(resp, 0, 24); | |
1927 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 1928 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 1929 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1930 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1931 | IEEE80211_STYPE_ACTION); | |
1932 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1933 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1934 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1935 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1936 | mgmt->u.action.u.sa_query.trans_id, | |
1937 | WLAN_SA_QUERY_TR_ID_LEN); | |
1938 | ||
62ae67be | 1939 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
1940 | } |
1941 | ||
de1ede7a JB |
1942 | static ieee80211_rx_result debug_noinline |
1943 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1944 | { | |
1945 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 1946 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 1947 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
84040805 | 1948 | struct sk_buff *nskb; |
026331c4 | 1949 | struct ieee80211_rx_status *status; |
de1ede7a JB |
1950 | int len = rx->skb->len; |
1951 | ||
1952 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1953 | return RX_CONTINUE; | |
1954 | ||
026331c4 JM |
1955 | /* drop too small frames */ |
1956 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 1957 | return RX_DROP_UNUSABLE; |
de1ede7a | 1958 | |
026331c4 | 1959 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 1960 | return RX_DROP_UNUSABLE; |
de1ede7a | 1961 | |
026331c4 | 1962 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 1963 | return RX_DROP_UNUSABLE; |
97ebe12a | 1964 | |
bef5d1c7 | 1965 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
84040805 JB |
1966 | return RX_DROP_UNUSABLE; |
1967 | ||
de1ede7a JB |
1968 | switch (mgmt->u.action.category) { |
1969 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1970 | /* |
1971 | * The aggregation code is not prepared to handle | |
1972 | * anything but STA/AP due to the BSSID handling; | |
1973 | * IBSS could work in the code but isn't supported | |
1974 | * by drivers or the standard. | |
1975 | */ | |
1976 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1977 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1978 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 1979 | break; |
8abd3f9b | 1980 | |
026331c4 JM |
1981 | /* verify action_code is present */ |
1982 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1983 | break; | |
1984 | ||
de1ede7a JB |
1985 | switch (mgmt->u.action.u.addba_req.action_code) { |
1986 | case WLAN_ACTION_ADDBA_REQ: | |
1987 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1988 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
1989 | goto invalid; |
1990 | break; | |
de1ede7a JB |
1991 | case WLAN_ACTION_ADDBA_RESP: |
1992 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1993 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
1994 | goto invalid; |
1995 | break; | |
de1ede7a JB |
1996 | case WLAN_ACTION_DELBA: |
1997 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1998 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
1999 | goto invalid; |
2000 | break; | |
2001 | default: | |
2002 | goto invalid; | |
de1ede7a | 2003 | } |
bed7ee6e | 2004 | |
8b58ff83 | 2005 | goto queue; |
39192c0b JB |
2006 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2007 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2008 | break; |
46900298 JB |
2009 | |
2010 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2011 | break; |
46900298 | 2012 | |
026331c4 JM |
2013 | /* verify action_code is present */ |
2014 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2015 | break; | |
2016 | ||
39192c0b JB |
2017 | switch (mgmt->u.action.u.measurement.action_code) { |
2018 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2019 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2020 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2021 | break; |
39192c0b | 2022 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2023 | goto handled; |
c481ec97 S |
2024 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2025 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2026 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2027 | break; |
c481ec97 | 2028 | |
cc32abd4 | 2029 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2030 | break; |
cc32abd4 | 2031 | |
46900298 | 2032 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2033 | break; |
c481ec97 | 2034 | |
8b58ff83 | 2035 | goto queue; |
39192c0b JB |
2036 | } |
2037 | break; | |
fea14732 JM |
2038 | case WLAN_CATEGORY_SA_QUERY: |
2039 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2040 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2041 | break; |
2042 | ||
fea14732 JM |
2043 | switch (mgmt->u.action.u.sa_query.action) { |
2044 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2045 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2046 | break; |
fea14732 | 2047 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2048 | goto handled; |
fea14732 JM |
2049 | } |
2050 | break; | |
97ad9139 JC |
2051 | case WLAN_CATEGORY_MESH_PLINK: |
2052 | case WLAN_CATEGORY_MESH_PATH_SEL: | |
77a121c3 JB |
2053 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2054 | break; | |
8b58ff83 | 2055 | goto queue; |
84040805 | 2056 | } |
026331c4 | 2057 | |
bed7ee6e | 2058 | invalid: |
84040805 JB |
2059 | /* |
2060 | * For AP mode, hostapd is responsible for handling any action | |
2061 | * frames that we didn't handle, including returning unknown | |
2062 | * ones. For all other modes we will return them to the sender, | |
2063 | * setting the 0x80 bit in the action category, as required by | |
2064 | * 802.11-2007 7.3.1.11. | |
2065 | */ | |
2066 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
2067 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2068 | return RX_DROP_MONITOR; | |
d7907448 | 2069 | |
026331c4 JM |
2070 | /* |
2071 | * Getting here means the kernel doesn't know how to handle | |
2072 | * it, but maybe userspace does ... include returned frames | |
2073 | * so userspace can register for those to know whether ones | |
2074 | * it transmitted were processed or returned. | |
2075 | */ | |
2076 | status = IEEE80211_SKB_RXCB(rx->skb); | |
2077 | ||
9d38d85d | 2078 | if (cfg80211_rx_action(rx->sdata->dev, status->freq, |
026331c4 JM |
2079 | rx->skb->data, rx->skb->len, |
2080 | GFP_ATOMIC)) | |
2081 | goto handled; | |
2082 | ||
84040805 JB |
2083 | /* do not return rejected action frames */ |
2084 | if (mgmt->u.action.category & 0x80) | |
2085 | return RX_DROP_UNUSABLE; | |
2086 | ||
2087 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2088 | GFP_ATOMIC); | |
2089 | if (nskb) { | |
292b4df6 | 2090 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2091 | |
292b4df6 JL |
2092 | nmgmt->u.action.category |= 0x80; |
2093 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2094 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2095 | |
2096 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2097 | ||
2098 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a JB |
2099 | } |
2100 | ||
84040805 | 2101 | handled: |
026331c4 JM |
2102 | if (rx->sta) |
2103 | rx->sta->rx_packets++; | |
39192c0b JB |
2104 | dev_kfree_skb(rx->skb); |
2105 | return RX_QUEUED; | |
8b58ff83 JB |
2106 | |
2107 | queue: | |
2108 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2109 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2110 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2111 | if (rx->sta) | |
2112 | rx->sta->rx_packets++; | |
2113 | return RX_QUEUED; | |
de1ede7a JB |
2114 | } |
2115 | ||
49461622 | 2116 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2117 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2118 | { |
eb9fb5b8 | 2119 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2120 | ieee80211_rx_result rxs; |
77a121c3 JB |
2121 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2122 | __le16 stype; | |
571ecf67 | 2123 | |
5cf121c3 | 2124 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 2125 | return RX_DROP_MONITOR; |
571ecf67 | 2126 | |
77a121c3 JB |
2127 | if (rx->skb->len < 24) |
2128 | return RX_DROP_MONITOR; | |
2129 | ||
bef5d1c7 JB |
2130 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
2131 | return RX_DROP_UNUSABLE; | |
97ebe12a | 2132 | |
af6b6374 JB |
2133 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2134 | if (rxs != RX_CONTINUE) | |
2135 | return rxs; | |
2136 | ||
77a121c3 | 2137 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2138 | |
77a121c3 JB |
2139 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2140 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2141 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2142 | return RX_DROP_MONITOR; | |
472dbc45 | 2143 | |
77a121c3 JB |
2144 | switch (stype) { |
2145 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2146 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2147 | /* process for all: mesh, mlme, ibss */ | |
2148 | break; | |
2149 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2150 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2151 | /* process only for station */ | |
2152 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2153 | return RX_DROP_MONITOR; | |
2154 | break; | |
2155 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2156 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2157 | /* process only for ibss */ | |
2158 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2159 | return RX_DROP_MONITOR; | |
2160 | break; | |
2161 | default: | |
2162 | return RX_DROP_MONITOR; | |
2163 | } | |
f9d540ee | 2164 | |
77a121c3 | 2165 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2166 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2167 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2168 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2169 | if (rx->sta) |
2170 | rx->sta->rx_packets++; | |
46900298 | 2171 | |
77a121c3 | 2172 | return RX_QUEUED; |
571ecf67 JB |
2173 | } |
2174 | ||
3b8d81e0 | 2175 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2176 | struct ieee80211_rx_data *rx) |
571ecf67 | 2177 | { |
a7767f95 HH |
2178 | int keyidx; |
2179 | unsigned int hdrlen; | |
571ecf67 | 2180 | |
a7767f95 | 2181 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2182 | if (rx->skb->len >= hdrlen + 4) |
2183 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2184 | else | |
2185 | keyidx = -1; | |
2186 | ||
8944b79f | 2187 | if (!rx->sta) { |
aa0daf0e JB |
2188 | /* |
2189 | * Some hardware seem to generate incorrect Michael MIC | |
2190 | * reports; ignore them to avoid triggering countermeasures. | |
2191 | */ | |
af2ced6a | 2192 | return; |
571ecf67 JB |
2193 | } |
2194 | ||
a7767f95 | 2195 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2196 | return; |
571ecf67 | 2197 | |
05c914fe | 2198 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2199 | /* |
2200 | * APs with pairwise keys should never receive Michael MIC | |
2201 | * errors for non-zero keyidx because these are reserved for | |
2202 | * group keys and only the AP is sending real multicast | |
2203 | * frames in the BSS. | |
2204 | */ | |
af2ced6a | 2205 | return; |
571ecf67 JB |
2206 | } |
2207 | ||
a7767f95 HH |
2208 | if (!ieee80211_is_data(hdr->frame_control) && |
2209 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2210 | return; |
571ecf67 | 2211 | |
e6d6e342 JB |
2212 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2213 | GFP_ATOMIC); | |
571ecf67 JB |
2214 | } |
2215 | ||
5cf121c3 | 2216 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2217 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2218 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2219 | { |
2220 | struct ieee80211_sub_if_data *sdata; | |
2221 | struct ieee80211_local *local = rx->local; | |
2222 | struct ieee80211_rtap_hdr { | |
2223 | struct ieee80211_radiotap_header hdr; | |
2224 | u8 flags; | |
5f0b7de5 | 2225 | u8 rate_or_pad; |
3d30d949 MW |
2226 | __le16 chan_freq; |
2227 | __le16 chan_flags; | |
bc10502d | 2228 | } __packed *rthdr; |
3d30d949 MW |
2229 | struct sk_buff *skb = rx->skb, *skb2; |
2230 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2231 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2232 | |
8c0c709e | 2233 | if (status->flag & RX_FLAG_INTERNAL_CMTR) |
3d30d949 MW |
2234 | goto out_free_skb; |
2235 | ||
2236 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
2237 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2238 | goto out_free_skb; | |
2239 | ||
2240 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2241 | memset(rthdr, 0, sizeof(*rthdr)); | |
2242 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2243 | rthdr->hdr.it_present = | |
2244 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2245 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2246 | ||
5f0b7de5 JB |
2247 | if (rate) { |
2248 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2249 | rthdr->hdr.it_present |= | |
2250 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2251 | } | |
3d30d949 MW |
2252 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2253 | ||
2254 | if (status->band == IEEE80211_BAND_5GHZ) | |
2255 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2256 | IEEE80211_CHAN_5GHZ); | |
2257 | else | |
2258 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2259 | IEEE80211_CHAN_2GHZ); | |
2260 | ||
2261 | skb_set_mac_header(skb, 0); | |
2262 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2263 | skb->pkt_type = PACKET_OTHERHOST; | |
2264 | skb->protocol = htons(ETH_P_802_2); | |
2265 | ||
2266 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2267 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2268 | continue; |
2269 | ||
05c914fe | 2270 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2271 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2272 | continue; | |
2273 | ||
2274 | if (prev_dev) { | |
2275 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2276 | if (skb2) { | |
2277 | skb2->dev = prev_dev; | |
5548a8a1 | 2278 | netif_receive_skb(skb2); |
3d30d949 MW |
2279 | } |
2280 | } | |
2281 | ||
2282 | prev_dev = sdata->dev; | |
2283 | sdata->dev->stats.rx_packets++; | |
2284 | sdata->dev->stats.rx_bytes += skb->len; | |
2285 | } | |
2286 | ||
2287 | if (prev_dev) { | |
2288 | skb->dev = prev_dev; | |
5548a8a1 | 2289 | netif_receive_skb(skb); |
3d30d949 MW |
2290 | skb = NULL; |
2291 | } else | |
2292 | goto out_free_skb; | |
2293 | ||
8c0c709e | 2294 | status->flag |= RX_FLAG_INTERNAL_CMTR; |
3d30d949 MW |
2295 | return; |
2296 | ||
2297 | out_free_skb: | |
2298 | dev_kfree_skb(skb); | |
2299 | } | |
2300 | ||
aa0c8636 CL |
2301 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2302 | ieee80211_rx_result res) | |
2303 | { | |
2304 | switch (res) { | |
2305 | case RX_DROP_MONITOR: | |
2306 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2307 | if (rx->sta) | |
2308 | rx->sta->rx_dropped++; | |
2309 | /* fall through */ | |
2310 | case RX_CONTINUE: { | |
2311 | struct ieee80211_rate *rate = NULL; | |
2312 | struct ieee80211_supported_band *sband; | |
2313 | struct ieee80211_rx_status *status; | |
2314 | ||
2315 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2316 | ||
2317 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2318 | if (!(status->flag & RX_FLAG_HT)) | |
2319 | rate = &sband->bitrates[status->rate_idx]; | |
2320 | ||
2321 | ieee80211_rx_cooked_monitor(rx, rate); | |
2322 | break; | |
2323 | } | |
2324 | case RX_DROP_UNUSABLE: | |
2325 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2326 | if (rx->sta) | |
2327 | rx->sta->rx_dropped++; | |
2328 | dev_kfree_skb(rx->skb); | |
2329 | break; | |
2330 | case RX_QUEUED: | |
2331 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2332 | break; | |
2333 | } | |
2334 | } | |
571ecf67 | 2335 | |
aa0c8636 CL |
2336 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, |
2337 | struct sk_buff_head *frames) | |
58905290 | 2338 | { |
58905290 | 2339 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2340 | struct sk_buff *skb; |
8944b79f | 2341 | |
e32f85f7 LCC |
2342 | #define CALL_RXH(rxh) \ |
2343 | do { \ | |
2344 | res = rxh(rx); \ | |
2345 | if (res != RX_CONTINUE) \ | |
2569a826 | 2346 | goto rxh_next; \ |
e32f85f7 | 2347 | } while (0); |
49461622 | 2348 | |
aa0c8636 | 2349 | while ((skb = __skb_dequeue(frames))) { |
2569a826 JB |
2350 | /* |
2351 | * all the other fields are valid across frames | |
2352 | * that belong to an aMPDU since they are on the | |
2353 | * same TID from the same station | |
2354 | */ | |
2355 | rx->skb = skb; | |
2356 | ||
2357 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2358 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2359 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2360 | CALL_RXH(ieee80211_rx_h_defragment) | |
2361 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2362 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2363 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2364 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2365 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2366 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2367 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2368 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2369 | #endif |
2569a826 JB |
2370 | CALL_RXH(ieee80211_rx_h_data) |
2371 | ||
2372 | /* special treatment -- needs the queue */ | |
aa0c8636 | 2373 | res = ieee80211_rx_h_ctrl(rx, frames); |
2569a826 JB |
2374 | if (res != RX_CONTINUE) |
2375 | goto rxh_next; | |
2376 | ||
2377 | CALL_RXH(ieee80211_rx_h_action) | |
2378 | CALL_RXH(ieee80211_rx_h_mgmt) | |
49461622 | 2379 | |
aa0c8636 CL |
2380 | rxh_next: |
2381 | ieee80211_rx_handlers_result(rx, res); | |
2382 | ||
49461622 | 2383 | #undef CALL_RXH |
aa0c8636 CL |
2384 | } |
2385 | } | |
2386 | ||
2387 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, | |
2388 | struct ieee80211_rx_data *rx, | |
071d9ac2 | 2389 | struct sk_buff *skb) |
aa0c8636 CL |
2390 | { |
2391 | struct sk_buff_head reorder_release; | |
2392 | ieee80211_rx_result res = RX_DROP_MONITOR; | |
2393 | ||
2394 | __skb_queue_head_init(&reorder_release); | |
2395 | ||
2396 | rx->skb = skb; | |
2397 | rx->sdata = sdata; | |
2398 | ||
2399 | #define CALL_RXH(rxh) \ | |
2400 | do { \ | |
2401 | res = rxh(rx); \ | |
2402 | if (res != RX_CONTINUE) \ | |
2403 | goto rxh_next; \ | |
2404 | } while (0); | |
2405 | ||
2406 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2407 | CALL_RXH(ieee80211_rx_h_check) | |
2408 | ||
2409 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); | |
2410 | ||
2411 | ieee80211_rx_handlers(rx, &reorder_release); | |
2412 | return; | |
49461622 | 2413 | |
2569a826 | 2414 | rxh_next: |
aa0c8636 CL |
2415 | ieee80211_rx_handlers_result(rx, res); |
2416 | ||
2417 | #undef CALL_RXH | |
58905290 JB |
2418 | } |
2419 | ||
2bff8ebf CL |
2420 | /* |
2421 | * This function makes calls into the RX path. Therefore the | |
2422 | * caller must hold the sta_info->lock and everything has to | |
2423 | * be under rcu_read_lock protection as well. | |
2424 | */ | |
2425 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2426 | { | |
2427 | struct sk_buff_head frames; | |
2428 | struct ieee80211_rx_data rx = { }; | |
2429 | ||
2430 | __skb_queue_head_init(&frames); | |
2431 | ||
2432 | /* construct rx struct */ | |
2433 | rx.sta = sta; | |
2434 | rx.sdata = sta->sdata; | |
2435 | rx.local = sta->local; | |
2436 | rx.queue = tid; | |
2437 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2438 | ||
2439 | if (unlikely(test_bit(SCAN_HW_SCANNING, &sta->local->scanning) || | |
2440 | test_bit(SCAN_OFF_CHANNEL, &sta->local->scanning))) | |
2441 | rx.flags |= IEEE80211_RX_IN_SCAN; | |
2442 | ||
2443 | spin_lock(&sta->ampdu_mlme.tid_rx[tid]->reorder_lock); | |
2444 | ieee80211_sta_reorder_release(&sta->local->hw, | |
2445 | sta->ampdu_mlme.tid_rx[tid], &frames); | |
2446 | spin_unlock(&sta->ampdu_mlme.tid_rx[tid]->reorder_lock); | |
2447 | ||
2448 | ieee80211_rx_handlers(&rx, &frames); | |
2449 | } | |
2450 | ||
571ecf67 JB |
2451 | /* main receive path */ |
2452 | ||
23a24def | 2453 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2454 | struct ieee80211_rx_data *rx, |
23a24def JB |
2455 | struct ieee80211_hdr *hdr) |
2456 | { | |
eb9fb5b8 JB |
2457 | struct sk_buff *skb = rx->skb; |
2458 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2459 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2460 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2461 | ||
51fb61e7 | 2462 | switch (sdata->vif.type) { |
05c914fe | 2463 | case NL80211_IFTYPE_STATION: |
9bc383de | 2464 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2465 | return 0; |
77fdaa12 | 2466 | if (!multicast && |
47846c9b | 2467 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2468 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2469 | return 0; |
5cf121c3 | 2470 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2471 | } |
2472 | break; | |
05c914fe | 2473 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2474 | if (!bssid) |
2475 | return 0; | |
a7767f95 | 2476 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2477 | return 1; |
87291c02 | 2478 | } |
46900298 | 2479 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2480 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2481 | return 0; |
5cf121c3 | 2482 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2483 | } else if (!multicast && |
47846c9b | 2484 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2485 | hdr->addr1) != 0) { |
4150c572 | 2486 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2487 | return 0; |
5cf121c3 | 2488 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2489 | } else if (!rx->sta) { |
2490 | int rate_idx; | |
eb9fb5b8 | 2491 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2492 | rate_idx = 0; /* TODO: HT rates */ |
2493 | else | |
eb9fb5b8 | 2494 | rate_idx = status->rate_idx; |
34e89507 JB |
2495 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2496 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2497 | } |
23a24def | 2498 | break; |
05c914fe | 2499 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2500 | if (!multicast && |
47846c9b | 2501 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2502 | hdr->addr1) != 0) { |
2503 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2504 | return 0; | |
2505 | ||
5cf121c3 | 2506 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2507 | } |
2508 | break; | |
05c914fe JB |
2509 | case NL80211_IFTYPE_AP_VLAN: |
2510 | case NL80211_IFTYPE_AP: | |
23a24def | 2511 | if (!bssid) { |
47846c9b | 2512 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2513 | hdr->addr1)) |
2514 | return 0; | |
2515 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2516 | sdata->vif.addr)) { |
5cf121c3 | 2517 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2518 | return 0; |
5cf121c3 | 2519 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2520 | } |
23a24def | 2521 | break; |
05c914fe | 2522 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2523 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2524 | return 0; |
2525 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2526 | return 0; | |
2527 | break; | |
05c914fe | 2528 | case NL80211_IFTYPE_MONITOR: |
05c914fe JB |
2529 | case NL80211_IFTYPE_UNSPECIFIED: |
2530 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2531 | /* should never get here */ |
2532 | WARN_ON(1); | |
2533 | break; | |
23a24def JB |
2534 | } |
2535 | ||
2536 | return 1; | |
2537 | } | |
2538 | ||
571ecf67 | 2539 | /* |
6368e4b1 RR |
2540 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2541 | * be called with rcu_read_lock protection. | |
571ecf67 | 2542 | */ |
71ebb4aa | 2543 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2544 | struct sk_buff *skb) |
571ecf67 | 2545 | { |
f1d58c25 | 2546 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2547 | struct ieee80211_local *local = hw_to_local(hw); |
2548 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2549 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2550 | __le16 fc; |
5cf121c3 | 2551 | struct ieee80211_rx_data rx; |
6368e4b1 | 2552 | int prepares; |
8e6f0032 JB |
2553 | struct ieee80211_sub_if_data *prev = NULL; |
2554 | struct sk_buff *skb_new; | |
abe60632 JB |
2555 | struct sta_info *sta, *tmp; |
2556 | bool found_sta = false; | |
e3cf8b3f | 2557 | int err = 0; |
571ecf67 | 2558 | |
e3cf8b3f | 2559 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2560 | memset(&rx, 0, sizeof(rx)); |
2561 | rx.skb = skb; | |
2562 | rx.local = local; | |
72abd81b | 2563 | |
e3cf8b3f | 2564 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2565 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2566 | |
142b9f50 HS |
2567 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2568 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2569 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2570 | |
e3cf8b3f ZY |
2571 | if (ieee80211_is_mgmt(fc)) |
2572 | err = skb_linearize(skb); | |
2573 | else | |
2574 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2575 | ||
2576 | if (err) { | |
2577 | dev_kfree_skb(skb); | |
2578 | return; | |
2579 | } | |
2580 | ||
2581 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2582 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2583 | ieee80211_verify_alignment(&rx); |
38f3714d | 2584 | |
e3cf8b3f | 2585 | if (ieee80211_is_data(fc)) { |
abe60632 JB |
2586 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
2587 | rx.sta = sta; | |
2588 | found_sta = true; | |
2589 | rx.sdata = sta->sdata; | |
2590 | ||
2591 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2592 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
2593 | if (prepares) { | |
2594 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2595 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2596 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2597 | } else | |
2598 | prev = rx.sdata; | |
2599 | } | |
af2ced6a | 2600 | } |
abe60632 JB |
2601 | } |
2602 | if (!found_sta) { | |
2603 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2604 | if (!ieee80211_sdata_running(sdata)) |
abe60632 | 2605 | continue; |
2a8a9a88 | 2606 | |
abe60632 JB |
2607 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2608 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2609 | continue; | |
b2e7771e | 2610 | |
abe60632 JB |
2611 | /* |
2612 | * frame is destined for this interface, but if it's | |
2613 | * not also for the previous one we handle that after | |
2614 | * the loop to avoid copying the SKB once too much | |
2615 | */ | |
340e11f3 | 2616 | |
abe60632 JB |
2617 | if (!prev) { |
2618 | prev = sdata; | |
2619 | continue; | |
2620 | } | |
340e11f3 | 2621 | |
4754ffd6 | 2622 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2623 | |
2624 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2625 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2626 | ||
2627 | if (!prepares) | |
2628 | goto next; | |
2629 | ||
2630 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2631 | rx.sdata = prev; | |
2632 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2633 | ieee80211_rx_michael_mic_report(hdr, | |
2634 | &rx); | |
2635 | goto next; | |
2636 | } | |
2637 | ||
abe60632 JB |
2638 | /* |
2639 | * frame was destined for the previous interface | |
2640 | * so invoke RX handlers for it | |
2641 | */ | |
2642 | ||
2643 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2644 | if (!skb_new) { | |
2645 | if (net_ratelimit()) | |
2646 | printk(KERN_DEBUG "%s: failed to copy " | |
2647 | "multicast frame for %s\n", | |
2648 | wiphy_name(local->hw.wiphy), | |
47846c9b | 2649 | prev->name); |
4bb29f8c | 2650 | goto next; |
abe60632 | 2651 | } |
071d9ac2 | 2652 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
4bb29f8c | 2653 | next: |
abe60632 | 2654 | prev = sdata; |
340e11f3 | 2655 | } |
4bb29f8c FF |
2656 | |
2657 | if (prev) { | |
4754ffd6 | 2658 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2659 | |
2660 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2661 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2662 | ||
2663 | if (!prepares) | |
2664 | prev = NULL; | |
2665 | } | |
571ecf67 | 2666 | } |
a4b7d7bd | 2667 | if (prev) |
071d9ac2 | 2668 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2669 | else |
8e6f0032 | 2670 | dev_kfree_skb(skb); |
571ecf67 | 2671 | } |
6368e4b1 RR |
2672 | |
2673 | /* | |
2674 | * This is the receive path handler. It is called by a low level driver when an | |
2675 | * 802.11 MPDU is received from the hardware. | |
2676 | */ | |
103bf9f7 | 2677 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2678 | { |
2679 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2680 | struct ieee80211_rate *rate = NULL; |
2681 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2682 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2683 | |
d20ef63d JB |
2684 | WARN_ON_ONCE(softirq_count() == 0); |
2685 | ||
77a980dc JB |
2686 | if (WARN_ON(status->band < 0 || |
2687 | status->band >= IEEE80211_NUM_BANDS)) | |
2688 | goto drop; | |
8318d78a JB |
2689 | |
2690 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2691 | if (WARN_ON(!sband)) |
2692 | goto drop; | |
8318d78a | 2693 | |
89c3a8ac JB |
2694 | /* |
2695 | * If we're suspending, it is possible although not too likely | |
2696 | * that we'd be receiving frames after having already partially | |
2697 | * quiesced the stack. We can't process such frames then since | |
2698 | * that might, for example, cause stations to be added or other | |
2699 | * driver callbacks be invoked. | |
2700 | */ | |
77a980dc JB |
2701 | if (unlikely(local->quiescing || local->suspended)) |
2702 | goto drop; | |
89c3a8ac | 2703 | |
ea77f12f JB |
2704 | /* |
2705 | * The same happens when we're not even started, | |
2706 | * but that's worth a warning. | |
2707 | */ | |
77a980dc JB |
2708 | if (WARN_ON(!local->started)) |
2709 | goto drop; | |
ea77f12f | 2710 | |
fc885189 | 2711 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 2712 | /* |
fc885189 JB |
2713 | * Validate the rate, unless a PLCP error means that |
2714 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 2715 | */ |
fc885189 JB |
2716 | |
2717 | if (status->flag & RX_FLAG_HT) { | |
2718 | /* | |
2719 | * rate_idx is MCS index, which can be [0-76] | |
2720 | * as documented on: | |
2721 | * | |
2722 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2723 | * | |
2724 | * Anything else would be some sort of driver or | |
2725 | * hardware error. The driver should catch hardware | |
2726 | * errors. | |
2727 | */ | |
2728 | if (WARN((status->rate_idx < 0 || | |
2729 | status->rate_idx > 76), | |
2730 | "Rate marked as an HT rate but passed " | |
2731 | "status->rate_idx is not " | |
2732 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2733 | status->rate_idx, | |
2734 | status->rate_idx)) | |
2735 | goto drop; | |
2736 | } else { | |
2737 | if (WARN_ON(status->rate_idx < 0 || | |
2738 | status->rate_idx >= sband->n_bitrates)) | |
2739 | goto drop; | |
2740 | rate = &sband->bitrates[status->rate_idx]; | |
2741 | } | |
0fb8ca45 | 2742 | } |
6368e4b1 RR |
2743 | |
2744 | /* | |
2745 | * key references and virtual interfaces are protected using RCU | |
2746 | * and this requires that we are in a read-side RCU section during | |
2747 | * receive processing | |
2748 | */ | |
2749 | rcu_read_lock(); | |
2750 | ||
2751 | /* | |
2752 | * Frames with failed FCS/PLCP checksum are not returned, | |
2753 | * all other frames are returned without radiotap header | |
2754 | * if it was previously present. | |
2755 | * Also, frames with less than 16 bytes are dropped. | |
2756 | */ | |
f1d58c25 | 2757 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2758 | if (!skb) { |
2759 | rcu_read_unlock(); | |
2760 | return; | |
2761 | } | |
2762 | ||
071d9ac2 | 2763 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
2764 | |
2765 | rcu_read_unlock(); | |
77a980dc JB |
2766 | |
2767 | return; | |
2768 | drop: | |
2769 | kfree_skb(skb); | |
6368e4b1 | 2770 | } |
103bf9f7 | 2771 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2772 | |
2773 | /* This is a version of the rx handler that can be called from hard irq | |
2774 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2775 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2776 | { |
2777 | struct ieee80211_local *local = hw_to_local(hw); | |
2778 | ||
2779 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2780 | ||
571ecf67 JB |
2781 | skb->pkt_type = IEEE80211_RX_MSG; |
2782 | skb_queue_tail(&local->skb_queue, skb); | |
2783 | tasklet_schedule(&local->tasklet); | |
2784 | } | |
2785 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |