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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 | ||
6ebacbb7 | 80 | if (status->flag & RX_FLAG_MACTIME_MPDU) |
601ae7f2 | 81 | len += 8; |
7fee5372 | 82 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 | 83 | len += 1; |
601ae7f2 BR |
84 | |
85 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
86 | len++; | |
87 | ||
6d744bac JB |
88 | if (status->flag & RX_FLAG_HT) /* HT info */ |
89 | len += 3; | |
90 | ||
601ae7f2 BR |
91 | return len; |
92 | } | |
93 | ||
d1c3a37c | 94 | /* |
601ae7f2 BR |
95 | * ieee80211_add_rx_radiotap_header - add radiotap header |
96 | * | |
97 | * add a radiotap header containing all the fields which the hardware provided. | |
98 | */ | |
99 | static void | |
100 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
101 | struct sk_buff *skb, | |
601ae7f2 BR |
102 | struct ieee80211_rate *rate, |
103 | int rtap_len) | |
104 | { | |
f1d58c25 | 105 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
106 | struct ieee80211_radiotap_header *rthdr; |
107 | unsigned char *pos; | |
6a86b9c7 | 108 | u16 rx_flags = 0; |
601ae7f2 BR |
109 | |
110 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
111 | memset(rthdr, 0, rtap_len); | |
112 | ||
113 | /* radiotap header, set always present flags */ | |
114 | rthdr->it_present = | |
115 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
116 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
117 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
118 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
119 | rthdr->it_len = cpu_to_le16(rtap_len); | |
120 | ||
121 | pos = (unsigned char *)(rthdr+1); | |
122 | ||
123 | /* the order of the following fields is important */ | |
124 | ||
125 | /* IEEE80211_RADIOTAP_TSFT */ | |
6ebacbb7 | 126 | if (status->flag & RX_FLAG_MACTIME_MPDU) { |
6a86b9c7 | 127 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
128 | rthdr->it_present |= |
129 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
130 | pos += 8; | |
131 | } | |
132 | ||
133 | /* IEEE80211_RADIOTAP_FLAGS */ | |
134 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
135 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
136 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
137 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
138 | if (status->flag & RX_FLAG_SHORTPRE) |
139 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
140 | pos++; |
141 | ||
142 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
143 | if (status->flag & RX_FLAG_HT) { |
144 | /* | |
38f37be2 | 145 | * MCS information is a separate field in radiotap, |
73b48099 JB |
146 | * added below. The byte here is needed as padding |
147 | * for the channel though, so initialise it to 0. | |
0fb8ca45 JM |
148 | */ |
149 | *pos = 0; | |
8d6f658e | 150 | } else { |
ebe6c7ba | 151 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 152 | *pos = rate->bitrate / 5; |
8d6f658e | 153 | } |
601ae7f2 BR |
154 | pos++; |
155 | ||
156 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 157 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
158 | pos += 2; |
159 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
160 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
161 | pos); | |
5f0b7de5 JB |
162 | else if (status->flag & RX_FLAG_HT) |
163 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
164 | pos); | |
9deb1ae5 | 165 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
166 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
167 | pos); | |
601ae7f2 | 168 | else |
6a86b9c7 JB |
169 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
170 | pos); | |
601ae7f2 BR |
171 | pos += 2; |
172 | ||
173 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
174 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
175 | *pos = status->signal; | |
176 | rthdr->it_present |= | |
177 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
178 | pos++; | |
179 | } | |
180 | ||
601ae7f2 BR |
181 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
182 | ||
183 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
184 | *pos = status->antenna; | |
185 | pos++; | |
186 | ||
601ae7f2 BR |
187 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
188 | ||
189 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
190 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 191 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 192 | pos++; |
aae89831 | 193 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
194 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
195 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 | 196 | pos += 2; |
6d744bac JB |
197 | |
198 | if (status->flag & RX_FLAG_HT) { | |
199 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); | |
200 | *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS | | |
201 | IEEE80211_RADIOTAP_MCS_HAVE_GI | | |
202 | IEEE80211_RADIOTAP_MCS_HAVE_BW; | |
203 | *pos = 0; | |
204 | if (status->flag & RX_FLAG_SHORT_GI) | |
205 | *pos |= IEEE80211_RADIOTAP_MCS_SGI; | |
206 | if (status->flag & RX_FLAG_40MHZ) | |
207 | *pos |= IEEE80211_RADIOTAP_MCS_BW_40; | |
208 | pos++; | |
209 | *pos++ = status->rate_idx; | |
210 | } | |
601ae7f2 BR |
211 | } |
212 | ||
b2e7771e JB |
213 | /* |
214 | * This function copies a received frame to all monitor interfaces and | |
215 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
216 | * radiotap header the driver might have added. | |
217 | */ | |
218 | static struct sk_buff * | |
219 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 220 | struct ieee80211_rate *rate) |
b2e7771e | 221 | { |
f1d58c25 | 222 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 223 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 224 | int needed_headroom = 0; |
b2e7771e JB |
225 | struct sk_buff *skb, *skb2; |
226 | struct net_device *prev_dev = NULL; | |
227 | int present_fcs_len = 0; | |
b2e7771e JB |
228 | |
229 | /* | |
230 | * First, we may need to make a copy of the skb because | |
231 | * (1) we need to modify it for radiotap (if not present), and | |
232 | * (2) the other RX handlers will modify the skb we got. | |
233 | * | |
234 | * We don't need to, of course, if we aren't going to return | |
235 | * the SKB because it has a bad FCS/PLCP checksum. | |
236 | */ | |
0869aea0 JB |
237 | |
238 | /* room for the radiotap header based on driver features */ | |
239 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
240 | |
241 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
242 | present_fcs_len = FCS_LEN; | |
243 | ||
e3cf8b3f ZY |
244 | /* make sure hdr->frame_control is on the linear part */ |
245 | if (!pskb_may_pull(origskb, 2)) { | |
246 | dev_kfree_skb(origskb); | |
247 | return NULL; | |
248 | } | |
249 | ||
b2e7771e | 250 | if (!local->monitors) { |
0869aea0 | 251 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
252 | dev_kfree_skb(origskb); |
253 | return NULL; | |
254 | } | |
255 | ||
0869aea0 | 256 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
257 | } |
258 | ||
0869aea0 | 259 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
260 | /* only need to expand headroom if necessary */ |
261 | skb = origskb; | |
262 | origskb = NULL; | |
263 | ||
264 | /* | |
265 | * This shouldn't trigger often because most devices have an | |
266 | * RX header they pull before we get here, and that should | |
267 | * be big enough for our radiotap information. We should | |
268 | * probably export the length to drivers so that we can have | |
269 | * them allocate enough headroom to start with. | |
270 | */ | |
271 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 272 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
273 | dev_kfree_skb(skb); |
274 | return NULL; | |
275 | } | |
276 | } else { | |
277 | /* | |
278 | * Need to make a copy and possibly remove radiotap header | |
279 | * and FCS from the original. | |
280 | */ | |
281 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
282 | ||
0869aea0 | 283 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
284 | |
285 | if (!skb) | |
286 | return origskb; | |
287 | } | |
288 | ||
0869aea0 JB |
289 | /* prepend radiotap information */ |
290 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 291 | |
ce3edf6d | 292 | skb_reset_mac_header(skb); |
b2e7771e JB |
293 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
294 | skb->pkt_type = PACKET_OTHERHOST; | |
295 | skb->protocol = htons(ETH_P_802_2); | |
296 | ||
297 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 298 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
299 | continue; |
300 | ||
3d30d949 MW |
301 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
302 | continue; | |
303 | ||
9607e6b6 | 304 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
305 | continue; |
306 | ||
b2e7771e JB |
307 | if (prev_dev) { |
308 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
309 | if (skb2) { | |
310 | skb2->dev = prev_dev; | |
5548a8a1 | 311 | netif_receive_skb(skb2); |
b2e7771e JB |
312 | } |
313 | } | |
314 | ||
315 | prev_dev = sdata->dev; | |
316 | sdata->dev->stats.rx_packets++; | |
317 | sdata->dev->stats.rx_bytes += skb->len; | |
318 | } | |
319 | ||
320 | if (prev_dev) { | |
321 | skb->dev = prev_dev; | |
5548a8a1 | 322 | netif_receive_skb(skb); |
b2e7771e JB |
323 | } else |
324 | dev_kfree_skb(skb); | |
325 | ||
326 | return origskb; | |
327 | } | |
328 | ||
329 | ||
5cf121c3 | 330 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 331 | { |
238f74a2 | 332 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 333 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
9e26297a | 334 | int tid, seqno_idx, security_idx; |
6e0d114d JB |
335 | |
336 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
337 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
338 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 339 | /* frame has qos control */ |
238f74a2 | 340 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
04b7dcf9 | 341 | if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) |
554891e6 | 342 | status->rx_flags |= IEEE80211_RX_AMSDU; |
9e26297a JB |
343 | |
344 | seqno_idx = tid; | |
345 | security_idx = tid; | |
6e0d114d | 346 | } else { |
1411f9b5 JB |
347 | /* |
348 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
349 | * | |
350 | * Sequence numbers for management frames, QoS data | |
351 | * frames with a broadcast/multicast address in the | |
352 | * Address 1 field, and all non-QoS data frames sent | |
353 | * by QoS STAs are assigned using an additional single | |
354 | * modulo-4096 counter, [...] | |
355 | * | |
356 | * We also use that counter for non-QoS STAs. | |
357 | */ | |
9e26297a JB |
358 | seqno_idx = NUM_RX_DATA_QUEUES; |
359 | security_idx = 0; | |
360 | if (ieee80211_is_mgmt(hdr->frame_control)) | |
361 | security_idx = NUM_RX_DATA_QUEUES; | |
362 | tid = 0; | |
6e0d114d | 363 | } |
52865dfd | 364 | |
9e26297a JB |
365 | rx->seqno_idx = seqno_idx; |
366 | rx->security_idx = security_idx; | |
6e0d114d JB |
367 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
368 | * For now, set skb->priority to 0 for other cases. */ | |
369 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 370 | } |
6e0d114d | 371 | |
d1c3a37c JB |
372 | /** |
373 | * DOC: Packet alignment | |
374 | * | |
375 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
376 | * to the stack. | |
377 | * | |
378 | * Additionally, should, if possible, align the payload data in a way that | |
379 | * guarantees that the contained IP header is aligned to a four-byte | |
380 | * boundary. In the case of regular frames, this simply means aligning the | |
381 | * payload to a four-byte boundary (because either the IP header is directly | |
382 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
383 | * in front of it). If the payload data is not properly aligned and the |
384 | * architecture doesn't support efficient unaligned operations, mac80211 | |
385 | * will align the data. | |
d1c3a37c JB |
386 | * |
387 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
388 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
389 | * push the IP header further back to a multiple of four again. Thankfully, the | |
390 | * specs were sane enough this time around to require padding each A-MSDU | |
391 | * subframe to a length that is a multiple of four. | |
392 | * | |
25985edc | 393 | * Padding like Atheros hardware adds which is between the 802.11 header and |
d1c3a37c JB |
394 | * the payload is not supported, the driver is required to move the 802.11 |
395 | * header to be directly in front of the payload in that case. | |
396 | */ | |
397 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 398 | { |
59d9cb07 KV |
399 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
400 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
401 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 402 | #endif |
6e0d114d JB |
403 | } |
404 | ||
6368e4b1 | 405 | |
571ecf67 JB |
406 | /* rx handlers */ |
407 | ||
49461622 | 408 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 409 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
410 | { |
411 | struct ieee80211_local *local = rx->local; | |
554891e6 | 412 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
413 | struct sk_buff *skb = rx->skb; |
414 | ||
79f460ca LC |
415 | if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) && |
416 | !local->sched_scanning)) | |
4080c7cd JB |
417 | return RX_CONTINUE; |
418 | ||
b23b025f | 419 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) || |
79f460ca LC |
420 | test_bit(SCAN_SW_SCANNING, &local->scanning) || |
421 | local->sched_scanning) | |
f1d58c25 | 422 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 423 | |
4080c7cd JB |
424 | /* scanning finished during invoking of handlers */ |
425 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
426 | return RX_DROP_UNUSABLE; | |
571ecf67 JB |
427 | } |
428 | ||
3cfcf6ac JM |
429 | |
430 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
431 | { | |
432 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
433 | ||
434 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
435 | return 0; | |
436 | ||
437 | return ieee80211_is_robust_mgmt_frame(hdr); | |
438 | } | |
439 | ||
440 | ||
441 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
442 | { | |
443 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
444 | ||
445 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
446 | return 0; | |
447 | ||
448 | return ieee80211_is_robust_mgmt_frame(hdr); | |
449 | } | |
450 | ||
451 | ||
452 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
453 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
454 | { | |
455 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
456 | struct ieee80211_mmie *mmie; | |
457 | ||
458 | if (skb->len < 24 + sizeof(*mmie) || | |
459 | !is_multicast_ether_addr(hdr->da)) | |
460 | return -1; | |
461 | ||
462 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
463 | return -1; /* not a robust management frame */ | |
464 | ||
465 | mmie = (struct ieee80211_mmie *) | |
466 | (skb->data + skb->len - sizeof(*mmie)); | |
467 | if (mmie->element_id != WLAN_EID_MMIE || | |
468 | mmie->length != sizeof(*mmie) - 2) | |
469 | return -1; | |
470 | ||
471 | return le16_to_cpu(mmie->key_id); | |
472 | } | |
473 | ||
474 | ||
33b64eb2 | 475 | static ieee80211_rx_result |
5cf121c3 | 476 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 477 | { |
a7767f95 | 478 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
47846c9b | 479 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 480 | |
a7767f95 | 481 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
482 | if (is_multicast_ether_addr(hdr->addr1)) { |
483 | if (ieee80211_has_tods(hdr->frame_control) || | |
484 | !ieee80211_has_fromds(hdr->frame_control)) | |
485 | return RX_DROP_MONITOR; | |
486 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
487 | return RX_DROP_MONITOR; | |
488 | } else { | |
489 | if (!ieee80211_has_a4(hdr->frame_control)) | |
490 | return RX_DROP_MONITOR; | |
491 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
492 | return RX_DROP_MONITOR; | |
493 | } | |
33b64eb2 LCC |
494 | } |
495 | ||
496 | /* If there is not an established peer link and this is not a peer link | |
497 | * establisment frame, beacon or probe, drop the frame. | |
498 | */ | |
499 | ||
57cf8043 | 500 | if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { |
33b64eb2 | 501 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 502 | |
a7767f95 | 503 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
504 | return RX_DROP_MONITOR; |
505 | ||
a7767f95 | 506 | if (ieee80211_is_action(hdr->frame_control)) { |
d3aaec8a | 507 | u8 category; |
33b64eb2 | 508 | mgmt = (struct ieee80211_mgmt *)hdr; |
d3aaec8a JC |
509 | category = mgmt->u.action.category; |
510 | if (category != WLAN_CATEGORY_MESH_ACTION && | |
511 | category != WLAN_CATEGORY_SELF_PROTECTED) | |
33b64eb2 | 512 | return RX_DROP_MONITOR; |
33b64eb2 | 513 | return RX_CONTINUE; |
33b64eb2 LCC |
514 | } |
515 | ||
a7767f95 HH |
516 | if (ieee80211_is_probe_req(hdr->frame_control) || |
517 | ieee80211_is_probe_resp(hdr->frame_control) || | |
71839121 JC |
518 | ieee80211_is_beacon(hdr->frame_control) || |
519 | ieee80211_is_auth(hdr->frame_control)) | |
a7767f95 HH |
520 | return RX_CONTINUE; |
521 | ||
522 | return RX_DROP_MONITOR; | |
523 | ||
524 | } | |
525 | ||
902acc78 JB |
526 | return RX_CONTINUE; |
527 | } | |
33b64eb2 | 528 | |
1edfb1af JB |
529 | #define SEQ_MODULO 0x1000 |
530 | #define SEQ_MASK 0xfff | |
531 | ||
532 | static inline int seq_less(u16 sq1, u16 sq2) | |
533 | { | |
534 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
535 | } | |
536 | ||
537 | static inline u16 seq_inc(u16 sq) | |
538 | { | |
539 | return (sq + 1) & SEQ_MASK; | |
540 | } | |
541 | ||
542 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
543 | { | |
544 | return (sq1 - sq2) & SEQ_MASK; | |
545 | } | |
546 | ||
547 | ||
548 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
549 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 550 | int index) |
1edfb1af | 551 | { |
24a8fdad | 552 | struct ieee80211_local *local = hw_to_local(hw); |
1edfb1af | 553 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
4cfda47b | 554 | struct ieee80211_rx_status *status; |
1edfb1af | 555 | |
dd318575 JB |
556 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
557 | ||
1edfb1af JB |
558 | if (!skb) |
559 | goto no_frame; | |
560 | ||
071d9ac2 | 561 | /* release the frame from the reorder ring buffer */ |
1edfb1af JB |
562 | tid_agg_rx->stored_mpdu_num--; |
563 | tid_agg_rx->reorder_buf[index] = NULL; | |
4cfda47b CL |
564 | status = IEEE80211_SKB_RXCB(skb); |
565 | status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; | |
24a8fdad | 566 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af JB |
567 | |
568 | no_frame: | |
569 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
570 | } | |
571 | ||
572 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
573 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 574 | u16 head_seq_num) |
1edfb1af JB |
575 | { |
576 | int index; | |
577 | ||
dd318575 JB |
578 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
579 | ||
1edfb1af JB |
580 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
581 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
582 | tid_agg_rx->buf_size; | |
24a8fdad | 583 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
1edfb1af JB |
584 | } |
585 | } | |
586 | ||
587 | /* | |
588 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
589 | * the skb was added to the buffer longer than this time ago, the earlier | |
590 | * frames that have not yet been received are assumed to be lost and the skb | |
591 | * can be released for processing. This may also release other skb's from the | |
592 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
593 | * |
594 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
595 | */ |
596 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
597 | ||
aa0c8636 | 598 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
24a8fdad | 599 | struct tid_ampdu_rx *tid_agg_rx) |
aa0c8636 | 600 | { |
2bff8ebf | 601 | int index, j; |
aa0c8636 | 602 | |
dd318575 JB |
603 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
604 | ||
aa0c8636 CL |
605 | /* release the buffer until next missing frame */ |
606 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
607 | tid_agg_rx->buf_size; | |
608 | if (!tid_agg_rx->reorder_buf[index] && | |
609 | tid_agg_rx->stored_mpdu_num > 1) { | |
610 | /* | |
611 | * No buffers ready to be released, but check whether any | |
612 | * frames in the reorder buffer have timed out. | |
613 | */ | |
aa0c8636 CL |
614 | int skipped = 1; |
615 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
616 | j = (j + 1) % tid_agg_rx->buf_size) { | |
617 | if (!tid_agg_rx->reorder_buf[j]) { | |
618 | skipped++; | |
619 | continue; | |
620 | } | |
499fe9a4 DH |
621 | if (skipped && |
622 | !time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
aa0c8636 | 623 | HT_RX_REORDER_BUF_TIMEOUT)) |
2bff8ebf | 624 | goto set_release_timer; |
aa0c8636 CL |
625 | |
626 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
627 | if (net_ratelimit()) | |
0fb9a9ec JP |
628 | wiphy_debug(hw->wiphy, |
629 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
aa0c8636 | 630 | #endif |
24a8fdad | 631 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
aa0c8636 CL |
632 | |
633 | /* | |
634 | * Increment the head seq# also for the skipped slots. | |
635 | */ | |
636 | tid_agg_rx->head_seq_num = | |
637 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
638 | skipped = 0; | |
639 | } | |
640 | } else while (tid_agg_rx->reorder_buf[index]) { | |
24a8fdad | 641 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
aa0c8636 CL |
642 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
643 | tid_agg_rx->buf_size; | |
644 | } | |
2bff8ebf CL |
645 | |
646 | if (tid_agg_rx->stored_mpdu_num) { | |
647 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
648 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
649 | ||
650 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
651 | j = (j + 1) % tid_agg_rx->buf_size) { | |
652 | if (tid_agg_rx->reorder_buf[j]) | |
653 | break; | |
654 | } | |
655 | ||
656 | set_release_timer: | |
657 | ||
658 | mod_timer(&tid_agg_rx->reorder_timer, | |
334df731 | 659 | tid_agg_rx->reorder_time[j] + 1 + |
2bff8ebf CL |
660 | HT_RX_REORDER_BUF_TIMEOUT); |
661 | } else { | |
662 | del_timer(&tid_agg_rx->reorder_timer); | |
663 | } | |
aa0c8636 CL |
664 | } |
665 | ||
1edfb1af JB |
666 | /* |
667 | * As this function belongs to the RX path it must be under | |
668 | * rcu_read_lock protection. It returns false if the frame | |
669 | * can be processed immediately, true if it was consumed. | |
670 | */ | |
671 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
672 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 673 | struct sk_buff *skb) |
1edfb1af JB |
674 | { |
675 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
676 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
677 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
678 | u16 head_seq_num, buf_size; | |
679 | int index; | |
2bff8ebf | 680 | bool ret = true; |
1edfb1af | 681 | |
dd318575 JB |
682 | spin_lock(&tid_agg_rx->reorder_lock); |
683 | ||
1edfb1af JB |
684 | buf_size = tid_agg_rx->buf_size; |
685 | head_seq_num = tid_agg_rx->head_seq_num; | |
686 | ||
687 | /* frame with out of date sequence number */ | |
688 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
689 | dev_kfree_skb(skb); | |
2bff8ebf | 690 | goto out; |
1edfb1af JB |
691 | } |
692 | ||
693 | /* | |
694 | * If frame the sequence number exceeds our buffering window | |
695 | * size release some previous frames to make room for this one. | |
696 | */ | |
697 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
698 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
699 | /* release stored frames up to new head to stack */ | |
24a8fdad | 700 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); |
1edfb1af JB |
701 | } |
702 | ||
703 | /* Now the new frame is always in the range of the reordering buffer */ | |
704 | ||
705 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
706 | ||
707 | /* check if we already stored this frame */ | |
708 | if (tid_agg_rx->reorder_buf[index]) { | |
709 | dev_kfree_skb(skb); | |
2bff8ebf | 710 | goto out; |
1edfb1af JB |
711 | } |
712 | ||
713 | /* | |
714 | * If the current MPDU is in the right order and nothing else | |
715 | * is stored we can process it directly, no need to buffer it. | |
c835b214 JB |
716 | * If it is first but there's something stored, we may be able |
717 | * to release frames after this one. | |
1edfb1af JB |
718 | */ |
719 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
720 | tid_agg_rx->stored_mpdu_num == 0) { | |
721 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
722 | ret = false; |
723 | goto out; | |
1edfb1af JB |
724 | } |
725 | ||
726 | /* put the frame in the reordering buffer */ | |
727 | tid_agg_rx->reorder_buf[index] = skb; | |
728 | tid_agg_rx->reorder_time[index] = jiffies; | |
729 | tid_agg_rx->stored_mpdu_num++; | |
24a8fdad | 730 | ieee80211_sta_reorder_release(hw, tid_agg_rx); |
1edfb1af | 731 | |
2bff8ebf CL |
732 | out: |
733 | spin_unlock(&tid_agg_rx->reorder_lock); | |
734 | return ret; | |
1edfb1af JB |
735 | } |
736 | ||
737 | /* | |
738 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
739 | * true if the MPDU was buffered, false if it should be processed. | |
740 | */ | |
24a8fdad | 741 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) |
1edfb1af | 742 | { |
2569a826 JB |
743 | struct sk_buff *skb = rx->skb; |
744 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
745 | struct ieee80211_hw *hw = &local->hw; |
746 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 747 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
748 | struct tid_ampdu_rx *tid_agg_rx; |
749 | u16 sc; | |
750 | int tid; | |
751 | ||
752 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 753 | goto dont_reorder; |
1edfb1af JB |
754 | |
755 | /* | |
756 | * filter the QoS data rx stream according to | |
757 | * STA/TID and check if this STA/TID is on aggregation | |
758 | */ | |
759 | ||
1edfb1af | 760 | if (!sta) |
2569a826 | 761 | goto dont_reorder; |
1edfb1af JB |
762 | |
763 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
764 | ||
a87f736d JB |
765 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
766 | if (!tid_agg_rx) | |
767 | goto dont_reorder; | |
1edfb1af JB |
768 | |
769 | /* qos null data frames are excluded */ | |
770 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 771 | goto dont_reorder; |
1edfb1af JB |
772 | |
773 | /* new, potentially un-ordered, ampdu frame - process it */ | |
774 | ||
775 | /* reset session timer */ | |
776 | if (tid_agg_rx->timeout) | |
777 | mod_timer(&tid_agg_rx->session_timer, | |
778 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
779 | ||
780 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
781 | sc = le16_to_cpu(hdr->seq_ctrl); | |
782 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 783 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
784 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
785 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 786 | return; |
1edfb1af JB |
787 | } |
788 | ||
a87f736d JB |
789 | /* |
790 | * No locking needed -- we will only ever process one | |
791 | * RX packet at a time, and thus own tid_agg_rx. All | |
792 | * other code manipulating it needs to (and does) make | |
793 | * sure that we cannot get to it any more before doing | |
794 | * anything with it. | |
795 | */ | |
24a8fdad | 796 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) |
2569a826 JB |
797 | return; |
798 | ||
799 | dont_reorder: | |
24a8fdad | 800 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af | 801 | } |
33b64eb2 | 802 | |
49461622 | 803 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 804 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 805 | { |
a7767f95 | 806 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 807 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
808 | |
809 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
810 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 811 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
9e26297a | 812 | rx->sta->last_seq_ctrl[rx->seqno_idx] == |
571ecf67 | 813 | hdr->seq_ctrl)) { |
554891e6 | 814 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
815 | rx->local->dot11FrameDuplicateCount++; |
816 | rx->sta->num_duplicates++; | |
817 | } | |
b1f93314 | 818 | return RX_DROP_UNUSABLE; |
571ecf67 | 819 | } else |
9e26297a | 820 | rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; |
571ecf67 JB |
821 | } |
822 | ||
571ecf67 JB |
823 | if (unlikely(rx->skb->len < 16)) { |
824 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 825 | return RX_DROP_MONITOR; |
571ecf67 JB |
826 | } |
827 | ||
571ecf67 JB |
828 | /* Drop disallowed frame classes based on STA auth/assoc state; |
829 | * IEEE 802.11, Chap 5.5. | |
830 | * | |
ccd7b362 JB |
831 | * mac80211 filters only based on association state, i.e. it drops |
832 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
833 | * deauth/disassoc frames when needed. In addition, hostapd is |
834 | * responsible for filtering on both auth and assoc states. | |
835 | */ | |
33b64eb2 | 836 | |
902acc78 | 837 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 838 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 839 | |
a7767f95 HH |
840 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
841 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 842 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
1be7fe8d | 843 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && |
c2c98fde | 844 | (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { |
2a33bee2 GE |
845 | if (rx->sta && rx->sta->dummy && |
846 | ieee80211_is_data_present(hdr->frame_control)) { | |
847 | u16 ethertype; | |
848 | u8 *payload; | |
849 | ||
850 | payload = rx->skb->data + | |
851 | ieee80211_hdrlen(hdr->frame_control); | |
852 | ethertype = (payload[6] << 8) | payload[7]; | |
853 | if (cpu_to_be16(ethertype) == | |
854 | rx->sdata->control_port_protocol) | |
855 | return RX_CONTINUE; | |
856 | } | |
e4c26add | 857 | return RX_DROP_MONITOR; |
2a33bee2 | 858 | } |
571ecf67 | 859 | |
9ae54c84 | 860 | return RX_CONTINUE; |
570bd537 JB |
861 | } |
862 | ||
863 | ||
49461622 | 864 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 865 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 866 | { |
eb9fb5b8 JB |
867 | struct sk_buff *skb = rx->skb; |
868 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
869 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
870 | int keyidx; |
871 | int hdrlen; | |
e4c26add | 872 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
e31b8213 | 873 | struct ieee80211_key *sta_ptk = NULL; |
3cfcf6ac | 874 | int mmie_keyidx = -1; |
761ab470 | 875 | __le16 fc; |
570bd537 | 876 | |
3017b80b JB |
877 | /* |
878 | * Key selection 101 | |
879 | * | |
3cfcf6ac | 880 | * There are four types of keys: |
3017b80b | 881 | * - GTK (group keys) |
3cfcf6ac | 882 | * - IGTK (group keys for management frames) |
3017b80b JB |
883 | * - PTK (pairwise keys) |
884 | * - STK (station-to-station pairwise keys) | |
885 | * | |
886 | * When selecting a key, we have to distinguish between multicast | |
887 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
888 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
889 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
890 | * unicast frames can also use key indices like GTKs. Hence, if we | |
891 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 892 | * |
8dc06a1c JB |
893 | * Note that in a regular BSS, multicast frames are sent by the |
894 | * AP only, associated stations unicast the frame to the AP first | |
895 | * which then multicasts it on their behalf. | |
896 | * | |
3017b80b JB |
897 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
898 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
899 | * The spec seems to expect that one negotiates the same key with |
900 | * every station but there's no such requirement; VLANs could be | |
901 | * possible. | |
3017b80b JB |
902 | */ |
903 | ||
3017b80b | 904 | /* |
1990af8d | 905 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
906 | * addressed to us nor a multicast frame. |
907 | */ | |
554891e6 | 908 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 909 | return RX_CONTINUE; |
3017b80b | 910 | |
2569a826 JB |
911 | /* start without a key */ |
912 | rx->key = NULL; | |
913 | ||
d4e46a3d | 914 | if (rx->sta) |
e31b8213 | 915 | sta_ptk = rcu_dereference(rx->sta->ptk); |
d4e46a3d | 916 | |
761ab470 JB |
917 | fc = hdr->frame_control; |
918 | ||
919 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
920 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
921 | ||
e31b8213 JB |
922 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
923 | rx->key = sta_ptk; | |
dc1580dd JB |
924 | if ((status->flag & RX_FLAG_DECRYPTED) && |
925 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
926 | return RX_CONTINUE; | |
0c7c10c7 | 927 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 928 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 929 | return RX_CONTINUE; |
3cfcf6ac JM |
930 | } else if (mmie_keyidx >= 0) { |
931 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
932 | if ((status->flag & RX_FLAG_DECRYPTED) && |
933 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
934 | return RX_CONTINUE; |
935 | ||
936 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
937 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
938 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
e31b8213 JB |
939 | if (rx->sta) |
940 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
941 | if (!rx->key) | |
942 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 943 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
944 | /* |
945 | * The frame was not protected, so skip decryption. However, we | |
946 | * need to set rx->key if there is a key that could have been | |
947 | * used so that the frame may be dropped if encryption would | |
948 | * have been expected. | |
949 | */ | |
950 | struct ieee80211_key *key = NULL; | |
897bed8b JB |
951 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
952 | int i; | |
953 | ||
761ab470 | 954 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
955 | is_multicast_ether_addr(hdr->addr1) && |
956 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
957 | rx->key = key; | |
897bed8b JB |
958 | else { |
959 | if (rx->sta) { | |
960 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
961 | key = rcu_dereference(rx->sta->gtk[i]); | |
962 | if (key) | |
963 | break; | |
964 | } | |
965 | } | |
966 | if (!key) { | |
967 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
968 | key = rcu_dereference(sdata->keys[i]); | |
969 | if (key) | |
970 | break; | |
971 | } | |
972 | } | |
973 | if (key) | |
974 | rx->key = key; | |
975 | } | |
0c7c10c7 | 976 | return RX_CONTINUE; |
571ecf67 | 977 | } else { |
39184b15 | 978 | u8 keyid; |
3017b80b JB |
979 | /* |
980 | * The device doesn't give us the IV so we won't be | |
981 | * able to look up the key. That's ok though, we | |
982 | * don't need to decrypt the frame, we just won't | |
983 | * be able to keep statistics accurate. | |
984 | * Except for key threshold notifications, should | |
985 | * we somehow allow the driver to tell us which key | |
986 | * the hardware used if this flag is set? | |
987 | */ | |
eb9fb5b8 JB |
988 | if ((status->flag & RX_FLAG_DECRYPTED) && |
989 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 990 | return RX_CONTINUE; |
3017b80b | 991 | |
761ab470 | 992 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
993 | |
994 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 995 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
996 | |
997 | /* | |
998 | * no need to call ieee80211_wep_get_keyidx, | |
999 | * it verifies a bunch of things we've done already | |
1000 | */ | |
39184b15 ZY |
1001 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
1002 | keyidx = keyid >> 6; | |
3017b80b | 1003 | |
e31b8213 JB |
1004 | /* check per-station GTK first, if multicast packet */ |
1005 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
1006 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
3017b80b | 1007 | |
e31b8213 JB |
1008 | /* if not found, try default key */ |
1009 | if (!rx->key) { | |
1010 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
1011 | ||
1012 | /* | |
1013 | * RSNA-protected unicast frames should always be | |
1014 | * sent with pairwise or station-to-station keys, | |
1015 | * but for WEP we allow using a key index as well. | |
1016 | */ | |
1017 | if (rx->key && | |
1018 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
1019 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1020 | !is_multicast_ether_addr(hdr->addr1)) | |
1021 | rx->key = NULL; | |
1022 | } | |
571ecf67 JB |
1023 | } |
1024 | ||
3017b80b | 1025 | if (rx->key) { |
95acac61 JB |
1026 | if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) |
1027 | return RX_DROP_MONITOR; | |
1028 | ||
571ecf67 | 1029 | rx->key->tx_rx_count++; |
011bfcc4 | 1030 | /* TODO: add threshold stuff again */ |
1990af8d | 1031 | } else { |
e4c26add | 1032 | return RX_DROP_MONITOR; |
70f08765 JB |
1033 | } |
1034 | ||
39184b15 ZY |
1035 | if (skb_linearize(rx->skb)) |
1036 | return RX_DROP_UNUSABLE; | |
761ab470 | 1037 | /* the hdr variable is invalid now! */ |
1990af8d | 1038 | |
97359d12 JB |
1039 | switch (rx->key->conf.cipher) { |
1040 | case WLAN_CIPHER_SUITE_WEP40: | |
1041 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
1042 | /* Check for weak IVs if possible */ |
1043 | if (rx->sta && ieee80211_is_data(fc) && | |
1044 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
1045 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1046 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
1047 | rx->sta->wep_weak_iv_count++; | |
1048 | ||
e2f036da MN |
1049 | result = ieee80211_crypto_wep_decrypt(rx); |
1050 | break; | |
97359d12 | 1051 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
1052 | result = ieee80211_crypto_tkip_decrypt(rx); |
1053 | break; | |
97359d12 | 1054 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1055 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1056 | break; | |
97359d12 | 1057 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1058 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1059 | break; | |
3ffc2a90 JB |
1060 | default: |
1061 | /* | |
1062 | * We can reach here only with HW-only algorithms | |
1063 | * but why didn't it decrypt the frame?! | |
1064 | */ | |
1065 | return RX_DROP_UNUSABLE; | |
70f08765 JB |
1066 | } |
1067 | ||
e2f036da | 1068 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1069 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1070 | |
1071 | return result; | |
70f08765 JB |
1072 | } |
1073 | ||
572e0012 KV |
1074 | static ieee80211_rx_result debug_noinline |
1075 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1076 | { | |
1077 | struct ieee80211_local *local; | |
1078 | struct ieee80211_hdr *hdr; | |
1079 | struct sk_buff *skb; | |
1080 | ||
1081 | local = rx->local; | |
1082 | skb = rx->skb; | |
1083 | hdr = (struct ieee80211_hdr *) skb->data; | |
1084 | ||
1085 | if (!local->pspolling) | |
1086 | return RX_CONTINUE; | |
1087 | ||
1088 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1089 | /* this is not from AP */ | |
1090 | return RX_CONTINUE; | |
1091 | ||
1092 | if (!ieee80211_is_data(hdr->frame_control)) | |
1093 | return RX_CONTINUE; | |
1094 | ||
1095 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1096 | /* AP has no more frames buffered for us */ | |
1097 | local->pspolling = false; | |
1098 | return RX_CONTINUE; | |
1099 | } | |
1100 | ||
1101 | /* more data bit is set, let's request a new frame from the AP */ | |
1102 | ieee80211_send_pspoll(local, rx->sdata); | |
1103 | ||
1104 | return RX_CONTINUE; | |
1105 | } | |
1106 | ||
133b8226 | 1107 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1108 | { |
133b8226 | 1109 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1110 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1111 | |
3e122be0 | 1112 | atomic_inc(&sdata->bss->num_sta_ps); |
c2c98fde | 1113 | set_sta_flag(sta, WLAN_STA_PS_STA); |
d057e5a3 AN |
1114 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
1115 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 1116 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1117 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1118 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1119 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1120 | } | |
1121 | ||
ff9458d3 | 1122 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1123 | { |
133b8226 | 1124 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1125 | |
3e122be0 | 1126 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1127 | |
571ecf67 | 1128 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1129 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1130 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1131 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1132 | |
c2c98fde | 1133 | if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1134 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1135 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1136 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1137 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1138 | return; |
1139 | } | |
1140 | ||
1141 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1142 | } |
1143 | ||
d057e5a3 AN |
1144 | int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) |
1145 | { | |
1146 | struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); | |
1147 | bool in_ps; | |
1148 | ||
1149 | WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); | |
1150 | ||
1151 | /* Don't let the same PS state be set twice */ | |
c2c98fde | 1152 | in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA); |
d057e5a3 AN |
1153 | if ((start && in_ps) || (!start && !in_ps)) |
1154 | return -EINVAL; | |
1155 | ||
1156 | if (start) | |
1157 | ap_sta_ps_start(sta_inf); | |
1158 | else | |
1159 | ap_sta_ps_end(sta_inf); | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | EXPORT_SYMBOL(ieee80211_sta_ps_transition); | |
1164 | ||
47086fc5 JB |
1165 | static ieee80211_rx_result debug_noinline |
1166 | ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) | |
1167 | { | |
1168 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
1169 | struct ieee80211_hdr *hdr = (void *)rx->skb->data; | |
1170 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
1171 | int tid, ac; | |
1172 | ||
1173 | if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
1174 | return RX_CONTINUE; | |
1175 | ||
1176 | if (sdata->vif.type != NL80211_IFTYPE_AP && | |
1177 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN) | |
1178 | return RX_CONTINUE; | |
1179 | ||
1180 | /* | |
1181 | * The device handles station powersave, so don't do anything about | |
1182 | * uAPSD and PS-Poll frames (the latter shouldn't even come up from | |
1183 | * it to mac80211 since they're handled.) | |
1184 | */ | |
1185 | if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
1186 | return RX_CONTINUE; | |
1187 | ||
1188 | /* | |
1189 | * Don't do anything if the station isn't already asleep. In | |
1190 | * the uAPSD case, the station will probably be marked asleep, | |
1191 | * in the PS-Poll case the station must be confused ... | |
1192 | */ | |
c2c98fde | 1193 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) |
47086fc5 JB |
1194 | return RX_CONTINUE; |
1195 | ||
1196 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { | |
c2c98fde JB |
1197 | if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { |
1198 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) | |
deeaee19 JB |
1199 | ieee80211_sta_ps_deliver_poll_response(rx->sta); |
1200 | else | |
c2c98fde | 1201 | set_sta_flag(rx->sta, WLAN_STA_PSPOLL); |
deeaee19 | 1202 | } |
47086fc5 JB |
1203 | |
1204 | /* Free PS Poll skb here instead of returning RX_DROP that would | |
1205 | * count as an dropped frame. */ | |
1206 | dev_kfree_skb(rx->skb); | |
1207 | ||
1208 | return RX_QUEUED; | |
1209 | } else if (!ieee80211_has_morefrags(hdr->frame_control) && | |
1210 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && | |
1211 | ieee80211_has_pm(hdr->frame_control) && | |
1212 | (ieee80211_is_data_qos(hdr->frame_control) || | |
1213 | ieee80211_is_qos_nullfunc(hdr->frame_control))) { | |
1214 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
1215 | ac = ieee802_1d_to_ac[tid & 7]; | |
1216 | ||
1217 | /* | |
1218 | * If this AC is not trigger-enabled do nothing. | |
1219 | * | |
1220 | * NB: This could/should check a separate bitmap of trigger- | |
1221 | * enabled queues, but for now we only implement uAPSD w/o | |
1222 | * TSPEC changes to the ACs, so they're always the same. | |
1223 | */ | |
1224 | if (!(rx->sta->sta.uapsd_queues & BIT(ac))) | |
1225 | return RX_CONTINUE; | |
1226 | ||
1227 | /* if we are in a service period, do nothing */ | |
c2c98fde | 1228 | if (test_sta_flag(rx->sta, WLAN_STA_SP)) |
47086fc5 JB |
1229 | return RX_CONTINUE; |
1230 | ||
c2c98fde | 1231 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) |
47086fc5 JB |
1232 | ieee80211_sta_ps_deliver_uapsd(rx->sta); |
1233 | else | |
c2c98fde | 1234 | set_sta_flag(rx->sta, WLAN_STA_UAPSD); |
47086fc5 JB |
1235 | } |
1236 | ||
1237 | return RX_CONTINUE; | |
1238 | } | |
1239 | ||
49461622 | 1240 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1241 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1242 | { |
1243 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1244 | struct sk_buff *skb = rx->skb; |
1245 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1246 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1247 | |
1248 | if (!sta) | |
9ae54c84 | 1249 | return RX_CONTINUE; |
571ecf67 | 1250 | |
b291ba11 JB |
1251 | /* |
1252 | * Update last_rx only for IBSS packets which are for the current | |
1253 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1254 | * where other STAs start using different BSSID. | |
1255 | */ | |
05c914fe | 1256 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1257 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1258 | NL80211_IFTYPE_ADHOC); |
3af6334c | 1259 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) { |
571ecf67 | 1260 | sta->last_rx = jiffies; |
3af6334c FF |
1261 | if (ieee80211_is_data(hdr->frame_control)) { |
1262 | sta->last_rx_rate_idx = status->rate_idx; | |
1263 | sta->last_rx_rate_flag = status->flag; | |
1264 | } | |
1265 | } | |
b291ba11 JB |
1266 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1267 | /* | |
33b64eb2 LCC |
1268 | * Mesh beacons will update last_rx when if they are found to |
1269 | * match the current local configuration when processed. | |
571ecf67 | 1270 | */ |
b291ba11 | 1271 | sta->last_rx = jiffies; |
3af6334c FF |
1272 | if (ieee80211_is_data(hdr->frame_control)) { |
1273 | sta->last_rx_rate_idx = status->rate_idx; | |
1274 | sta->last_rx_rate_flag = status->flag; | |
1275 | } | |
571ecf67 JB |
1276 | } |
1277 | ||
554891e6 | 1278 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1279 | return RX_CONTINUE; |
571ecf67 | 1280 | |
3cf335d5 KV |
1281 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1282 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1283 | ||
571ecf67 JB |
1284 | sta->rx_fragments++; |
1285 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1286 | sta->last_signal = status->signal; |
541a45a1 | 1287 | ewma_add(&sta->avg_signal, -status->signal); |
571ecf67 | 1288 | |
72eaa43a JB |
1289 | /* |
1290 | * Change STA power saving mode only at the end of a frame | |
1291 | * exchange sequence. | |
1292 | */ | |
d057e5a3 AN |
1293 | if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && |
1294 | !ieee80211_has_morefrags(hdr->frame_control) && | |
4cfda47b | 1295 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
05c914fe JB |
1296 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1297 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
c2c98fde | 1298 | if (test_sta_flag(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1299 | /* |
1300 | * Ignore doze->wake transitions that are | |
1301 | * indicated by non-data frames, the standard | |
1302 | * is unclear here, but for example going to | |
1303 | * PS mode and then scanning would cause a | |
1304 | * doze->wake transition for the probe request, | |
1305 | * and that is clearly undesirable. | |
1306 | */ | |
1307 | if (ieee80211_is_data(hdr->frame_control) && | |
1308 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1309 | ap_sta_ps_end(sta); |
72eaa43a JB |
1310 | } else { |
1311 | if (ieee80211_has_pm(hdr->frame_control)) | |
1312 | ap_sta_ps_start(sta); | |
1313 | } | |
571ecf67 JB |
1314 | } |
1315 | ||
22403def JB |
1316 | /* |
1317 | * Drop (qos-)data::nullfunc frames silently, since they | |
1318 | * are used only to control station power saving mode. | |
1319 | */ | |
1320 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1321 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1322 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1323 | |
1324 | /* | |
1325 | * If we receive a 4-addr nullfunc frame from a STA | |
1326 | * that was not moved to a 4-addr STA vlan yet, drop | |
1327 | * the frame to the monitor interface, to make sure | |
1328 | * that hostapd sees it | |
1329 | */ | |
1330 | if (ieee80211_has_a4(hdr->frame_control) && | |
1331 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1332 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1333 | !rx->sdata->u.vlan.sta))) | |
1334 | return RX_DROP_MONITOR; | |
22403def JB |
1335 | /* |
1336 | * Update counter and free packet here to avoid | |
1337 | * counting this as a dropped packed. | |
1338 | */ | |
571ecf67 JB |
1339 | sta->rx_packets++; |
1340 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1341 | return RX_QUEUED; |
571ecf67 JB |
1342 | } |
1343 | ||
9ae54c84 | 1344 | return RX_CONTINUE; |
571ecf67 JB |
1345 | } /* ieee80211_rx_h_sta_process */ |
1346 | ||
571ecf67 JB |
1347 | static inline struct ieee80211_fragment_entry * |
1348 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1349 | unsigned int frag, unsigned int seq, int rx_queue, | |
1350 | struct sk_buff **skb) | |
1351 | { | |
1352 | struct ieee80211_fragment_entry *entry; | |
1353 | int idx; | |
1354 | ||
1355 | idx = sdata->fragment_next; | |
1356 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1357 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1358 | sdata->fragment_next = 0; | |
1359 | ||
1360 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1361 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1362 | struct ieee80211_hdr *hdr = |
1363 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1364 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1365 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1366 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1367 | sdata->name, idx, |
571ecf67 | 1368 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1369 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1370 | #endif |
571ecf67 JB |
1371 | __skb_queue_purge(&entry->skb_list); |
1372 | } | |
1373 | ||
1374 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1375 | *skb = NULL; | |
1376 | entry->first_frag_time = jiffies; | |
1377 | entry->seq = seq; | |
1378 | entry->rx_queue = rx_queue; | |
1379 | entry->last_frag = frag; | |
1380 | entry->ccmp = 0; | |
1381 | entry->extra_len = 0; | |
1382 | ||
1383 | return entry; | |
1384 | } | |
1385 | ||
1386 | static inline struct ieee80211_fragment_entry * | |
1387 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1388 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1389 | int rx_queue, struct ieee80211_hdr *hdr) |
1390 | { | |
1391 | struct ieee80211_fragment_entry *entry; | |
1392 | int i, idx; | |
1393 | ||
1394 | idx = sdata->fragment_next; | |
1395 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1396 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1397 | |
1398 | idx--; | |
1399 | if (idx < 0) | |
1400 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1401 | ||
1402 | entry = &sdata->fragments[idx]; | |
1403 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1404 | entry->rx_queue != rx_queue || | |
1405 | entry->last_frag + 1 != frag) | |
1406 | continue; | |
1407 | ||
b73d70ad | 1408 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1409 | |
b73d70ad HH |
1410 | /* |
1411 | * Check ftype and addresses are equal, else check next fragment | |
1412 | */ | |
1413 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1414 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1415 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1416 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1417 | continue; | |
1418 | ||
ab46623e | 1419 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1420 | __skb_queue_purge(&entry->skb_list); |
1421 | continue; | |
1422 | } | |
1423 | return entry; | |
1424 | } | |
1425 | ||
1426 | return NULL; | |
1427 | } | |
1428 | ||
49461622 | 1429 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1430 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1431 | { |
1432 | struct ieee80211_hdr *hdr; | |
1433 | u16 sc; | |
358c8d9d | 1434 | __le16 fc; |
571ecf67 JB |
1435 | unsigned int frag, seq; |
1436 | struct ieee80211_fragment_entry *entry; | |
1437 | struct sk_buff *skb; | |
554891e6 | 1438 | struct ieee80211_rx_status *status; |
571ecf67 | 1439 | |
b73d70ad | 1440 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1441 | fc = hdr->frame_control; |
571ecf67 JB |
1442 | sc = le16_to_cpu(hdr->seq_ctrl); |
1443 | frag = sc & IEEE80211_SCTL_FRAG; | |
1444 | ||
358c8d9d | 1445 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1446 | (rx->skb)->len < 24 || |
1447 | is_multicast_ether_addr(hdr->addr1))) { | |
1448 | /* not fragmented */ | |
1449 | goto out; | |
1450 | } | |
1451 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1452 | ||
e3cf8b3f ZY |
1453 | if (skb_linearize(rx->skb)) |
1454 | return RX_DROP_UNUSABLE; | |
1455 | ||
058897a4 AK |
1456 | /* |
1457 | * skb_linearize() might change the skb->data and | |
1458 | * previously cached variables (in this case, hdr) need to | |
1459 | * be refreshed with the new data. | |
1460 | */ | |
1461 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1462 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1463 | ||
1464 | if (frag == 0) { | |
1465 | /* This is the first fragment of a new frame. */ | |
1466 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
9e26297a | 1467 | rx->seqno_idx, &(rx->skb)); |
97359d12 | 1468 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1469 | ieee80211_has_protected(fc)) { |
9e26297a | 1470 | int queue = rx->security_idx; |
571ecf67 JB |
1471 | /* Store CCMP PN so that we can verify that the next |
1472 | * fragment has a sequential PN value. */ | |
1473 | entry->ccmp = 1; | |
1474 | memcpy(entry->last_pn, | |
9190252c | 1475 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1476 | CCMP_PN_LEN); |
1477 | } | |
9ae54c84 | 1478 | return RX_QUEUED; |
571ecf67 JB |
1479 | } |
1480 | ||
1481 | /* This is a fragment for a frame that should already be pending in | |
1482 | * fragment cache. Add this fragment to the end of the pending entry. | |
1483 | */ | |
9e26297a JB |
1484 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, |
1485 | rx->seqno_idx, hdr); | |
571ecf67 JB |
1486 | if (!entry) { |
1487 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1488 | return RX_DROP_MONITOR; |
571ecf67 JB |
1489 | } |
1490 | ||
1491 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1492 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1493 | if (entry->ccmp) { | |
1494 | int i; | |
1495 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1496 | int queue; |
97359d12 | 1497 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1498 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1499 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1500 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1501 | pn[i]++; | |
1502 | if (pn[i]) | |
1503 | break; | |
1504 | } | |
9e26297a | 1505 | queue = rx->security_idx; |
9190252c | 1506 | rpn = rx->key->u.ccmp.rx_pn[queue]; |
f4ea83dd | 1507 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1508 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1509 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1510 | } | |
1511 | ||
358c8d9d | 1512 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1513 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1514 | entry->last_frag = frag; | |
1515 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1516 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1517 | rx->skb = NULL; |
9ae54c84 | 1518 | return RX_QUEUED; |
571ecf67 JB |
1519 | } |
1520 | ||
1521 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1522 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1523 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1524 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1525 | GFP_ATOMIC))) { | |
1526 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1527 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1528 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1529 | } |
1530 | } | |
1531 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1532 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1533 | dev_kfree_skb(skb); | |
1534 | } | |
1535 | ||
1536 | /* Complete frame has been reassembled - process it now */ | |
554891e6 JB |
1537 | status = IEEE80211_SKB_RXCB(rx->skb); |
1538 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
571ecf67 JB |
1539 | |
1540 | out: | |
1541 | if (rx->sta) | |
1542 | rx->sta->rx_packets++; | |
1543 | if (is_multicast_ether_addr(hdr->addr1)) | |
1544 | rx->local->dot11MulticastReceivedFrameCount++; | |
1545 | else | |
1546 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1547 | return RX_CONTINUE; |
571ecf67 JB |
1548 | } |
1549 | ||
49461622 | 1550 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1551 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1552 | { |
6e0d114d | 1553 | u8 *data = rx->skb->data; |
238f74a2 | 1554 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1555 | |
238f74a2 | 1556 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1557 | return RX_CONTINUE; |
6e0d114d JB |
1558 | |
1559 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1560 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1561 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1562 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1563 | /* change frame type to non QOS */ |
238f74a2 | 1564 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1565 | |
9ae54c84 | 1566 | return RX_CONTINUE; |
6e0d114d JB |
1567 | } |
1568 | ||
76ee65bf | 1569 | static int |
5cf121c3 | 1570 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1571 | { |
07346f81 | 1572 | if (unlikely(!rx->sta || |
c2c98fde | 1573 | !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1574 | return -EACCES; |
571ecf67 | 1575 | |
76ee65bf | 1576 | return 0; |
571ecf67 JB |
1577 | } |
1578 | ||
76ee65bf | 1579 | static int |
358c8d9d | 1580 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1581 | { |
eb9fb5b8 JB |
1582 | struct sk_buff *skb = rx->skb; |
1583 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1584 | ||
3017b80b | 1585 | /* |
7848ba7d JB |
1586 | * Pass through unencrypted frames if the hardware has |
1587 | * decrypted them already. | |
3017b80b | 1588 | */ |
eb9fb5b8 | 1589 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1590 | return 0; |
571ecf67 JB |
1591 | |
1592 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1593 | if (unlikely(!ieee80211_has_protected(fc) && |
1594 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1595 | ieee80211_is_data(fc) && |
b3fc9c6c | 1596 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1597 | return -EACCES; |
bef5d1c7 JB |
1598 | |
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | static int | |
1603 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1604 | { | |
1605 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1606 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1607 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1608 | |
e3efca0a JM |
1609 | /* |
1610 | * Pass through unencrypted frames if the hardware has | |
1611 | * decrypted them already. | |
1612 | */ | |
1613 | if (status->flag & RX_FLAG_DECRYPTED) | |
1614 | return 0; | |
bef5d1c7 | 1615 | |
c2c98fde | 1616 | if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1617 | if (unlikely(!ieee80211_has_protected(fc) && |
1618 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
cf4e594e JM |
1619 | rx->key)) { |
1620 | if (ieee80211_is_deauth(fc)) | |
1621 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1622 | rx->skb->data, | |
1623 | rx->skb->len); | |
1624 | else if (ieee80211_is_disassoc(fc)) | |
1625 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1626 | rx->skb->data, | |
1627 | rx->skb->len); | |
f2ca3ea4 | 1628 | return -EACCES; |
cf4e594e | 1629 | } |
f2ca3ea4 | 1630 | /* BIP does not use Protected field, so need to check MMIE */ |
f64f9e71 | 1631 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
cf4e594e JM |
1632 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
1633 | if (ieee80211_is_deauth(fc)) | |
1634 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1635 | rx->skb->data, | |
1636 | rx->skb->len); | |
1637 | else if (ieee80211_is_disassoc(fc)) | |
1638 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1639 | rx->skb->data, | |
1640 | rx->skb->len); | |
f2ca3ea4 | 1641 | return -EACCES; |
cf4e594e | 1642 | } |
f2ca3ea4 JM |
1643 | /* |
1644 | * When using MFP, Action frames are not allowed prior to | |
1645 | * having configured keys. | |
1646 | */ | |
1647 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1648 | ieee80211_is_robust_mgmt_frame( | |
1649 | (struct ieee80211_hdr *) rx->skb->data))) | |
1650 | return -EACCES; | |
1651 | } | |
b3fc9c6c | 1652 | |
76ee65bf | 1653 | return 0; |
571ecf67 JB |
1654 | } |
1655 | ||
76ee65bf | 1656 | static int |
4114fa21 | 1657 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) |
571ecf67 | 1658 | { |
eb9fb5b8 | 1659 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee | 1660 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
fbb327c5 FF |
1661 | bool check_port_control = false; |
1662 | struct ethhdr *ehdr; | |
1663 | int ret; | |
f14543ee | 1664 | |
4114fa21 | 1665 | *port_control = false; |
9bc383de JB |
1666 | if (ieee80211_has_a4(hdr->frame_control) && |
1667 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1668 | return -1; |
9bc383de | 1669 | |
fbb327c5 FF |
1670 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
1671 | !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { | |
1672 | ||
1673 | if (!sdata->u.mgd.use_4addr) | |
1674 | return -1; | |
1675 | else | |
1676 | check_port_control = true; | |
1677 | } | |
1678 | ||
9bc383de | 1679 | if (is_multicast_ether_addr(hdr->addr1) && |
fbb327c5 | 1680 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) |
f14543ee | 1681 | return -1; |
571ecf67 | 1682 | |
fbb327c5 | 1683 | ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
4114fa21 | 1684 | if (ret < 0) |
fbb327c5 FF |
1685 | return ret; |
1686 | ||
1687 | ehdr = (struct ethhdr *) rx->skb->data; | |
4114fa21 FF |
1688 | if (ehdr->h_proto == rx->sdata->control_port_protocol) |
1689 | *port_control = true; | |
1690 | else if (check_port_control) | |
fbb327c5 FF |
1691 | return -1; |
1692 | ||
1693 | return 0; | |
76ee65bf | 1694 | } |
571ecf67 | 1695 | |
ce3edf6d JB |
1696 | /* |
1697 | * requires that rx->skb is a frame with ethernet header | |
1698 | */ | |
358c8d9d | 1699 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1700 | { |
c97c23e3 | 1701 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1702 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1703 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1704 | ||
1705 | /* | |
1706 | * Allow EAPOL frames to us/the PAE group address regardless | |
1707 | * of whether the frame was encrypted or not. | |
1708 | */ | |
a621fa4d | 1709 | if (ehdr->h_proto == rx->sdata->control_port_protocol && |
47846c9b | 1710 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1711 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1712 | return true; | |
1713 | ||
1714 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1715 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1716 | return false; |
1717 | ||
1718 | return true; | |
1719 | } | |
1720 | ||
1721 | /* | |
1722 | * requires that rx->skb is a frame with ethernet header | |
1723 | */ | |
76ee65bf | 1724 | static void |
5cf121c3 | 1725 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1726 | { |
eb9fb5b8 JB |
1727 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1728 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1729 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1730 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1731 | struct sta_info *dsta; | |
554891e6 | 1732 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1733 | |
76ee65bf RR |
1734 | skb = rx->skb; |
1735 | xmit_skb = NULL; | |
571ecf67 | 1736 | |
05c914fe JB |
1737 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1738 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1739 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
554891e6 | 1740 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
9bc383de | 1741 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
ce3edf6d JB |
1742 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1743 | /* | |
1744 | * send multicast frames both to higher layers in | |
1745 | * local net stack and back to the wireless medium | |
1746 | */ | |
76ee65bf RR |
1747 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1748 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1749 | printk(KERN_DEBUG "%s: failed to clone " |
1750 | "multicast frame\n", dev->name); | |
1751 | } else { | |
abe60632 JB |
1752 | dsta = sta_info_get(sdata, skb->data); |
1753 | if (dsta) { | |
ce3edf6d JB |
1754 | /* |
1755 | * The destination station is associated to | |
1756 | * this AP (in this VLAN), so send the frame | |
1757 | * directly to it and do not pass it to local | |
1758 | * net stack. | |
571ecf67 | 1759 | */ |
76ee65bf | 1760 | xmit_skb = skb; |
571ecf67 JB |
1761 | skb = NULL; |
1762 | } | |
571ecf67 JB |
1763 | } |
1764 | } | |
1765 | ||
1766 | if (skb) { | |
d1c3a37c JB |
1767 | int align __maybe_unused; |
1768 | ||
59d9cb07 | 1769 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1770 | /* |
1771 | * 'align' will only take the values 0 or 2 here | |
1772 | * since all frames are required to be aligned | |
1773 | * to 2-byte boundaries when being passed to | |
1774 | * mac80211. That also explains the __skb_push() | |
1775 | * below. | |
1776 | */ | |
dacb6f1d | 1777 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1778 | if (align) { |
1779 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1780 | dev_kfree_skb(skb); | |
1781 | skb = NULL; | |
1782 | } else { | |
1783 | u8 *data = skb->data; | |
8ce0b589 ZY |
1784 | size_t len = skb_headlen(skb); |
1785 | skb->data -= align; | |
1786 | memmove(skb->data, data, len); | |
1787 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1788 | } |
1789 | } | |
1790 | #endif | |
1791 | ||
1792 | if (skb) { | |
1793 | /* deliver to local stack */ | |
1794 | skb->protocol = eth_type_trans(skb, dev); | |
1795 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1796 | netif_receive_skb(skb); |
d1c3a37c | 1797 | } |
571ecf67 JB |
1798 | } |
1799 | ||
76ee65bf | 1800 | if (xmit_skb) { |
571ecf67 | 1801 | /* send to wireless media */ |
f831e909 | 1802 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1803 | skb_reset_network_header(xmit_skb); |
1804 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1805 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1806 | } |
76ee65bf RR |
1807 | } |
1808 | ||
49461622 | 1809 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1810 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1811 | { |
eb9fb5b8 | 1812 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1813 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1814 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1815 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1816 | struct sk_buff_head frame_list; |
554891e6 | 1817 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
fd4c7f2f | 1818 | |
358c8d9d | 1819 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1820 | return RX_CONTINUE; |
fd4c7f2f | 1821 | |
358c8d9d | 1822 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1823 | return RX_DROP_MONITOR; |
fd4c7f2f | 1824 | |
554891e6 | 1825 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1826 | return RX_CONTINUE; |
fd4c7f2f | 1827 | |
eaf85ca7 ZY |
1828 | if (ieee80211_has_a4(hdr->frame_control) && |
1829 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1830 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1831 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1832 | |
eaf85ca7 ZY |
1833 | if (is_multicast_ether_addr(hdr->addr1) && |
1834 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1835 | rx->sdata->u.vlan.sta) || | |
1836 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1837 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1838 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1839 | |
eaf85ca7 ZY |
1840 | skb->dev = dev; |
1841 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1842 | |
e3cf8b3f ZY |
1843 | if (skb_linearize(skb)) |
1844 | return RX_DROP_UNUSABLE; | |
1845 | ||
eaf85ca7 ZY |
1846 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1847 | rx->sdata->vif.type, | |
8b3becad | 1848 | rx->local->hw.extra_tx_headroom, true); |
fd4c7f2f | 1849 | |
eaf85ca7 ZY |
1850 | while (!skb_queue_empty(&frame_list)) { |
1851 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1852 | |
358c8d9d | 1853 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1854 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1855 | continue; |
1856 | } | |
eaf85ca7 ZY |
1857 | dev->stats.rx_packets++; |
1858 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1859 | |
1860 | ieee80211_deliver_skb(rx); | |
1861 | } | |
1862 | ||
9ae54c84 | 1863 | return RX_QUEUED; |
fd4c7f2f RR |
1864 | } |
1865 | ||
bf94e17b | 1866 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1867 | static ieee80211_rx_result |
e32f85f7 LCC |
1868 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1869 | { | |
1870 | struct ieee80211_hdr *hdr; | |
1871 | struct ieee80211s_hdr *mesh_hdr; | |
1872 | unsigned int hdrlen; | |
1873 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1874 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1875 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
554891e6 | 1876 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
e32f85f7 LCC |
1877 | |
1878 | hdr = (struct ieee80211_hdr *) skb->data; | |
1879 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1880 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1881 | ||
2157fdd6 TP |
1882 | /* frame is in RMC, don't forward */ |
1883 | if (ieee80211_is_data(hdr->frame_control) && | |
1884 | is_multicast_ether_addr(hdr->addr1) && | |
1885 | mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata)) | |
1886 | return RX_DROP_MONITOR; | |
1887 | ||
e32f85f7 LCC |
1888 | if (!ieee80211_is_data(hdr->frame_control)) |
1889 | return RX_CONTINUE; | |
1890 | ||
1891 | if (!mesh_hdr->ttl) | |
1892 | /* illegal frame */ | |
1893 | return RX_DROP_MONITOR; | |
1894 | ||
cfee66b0 JC |
1895 | if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) { |
1896 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1897 | dropped_frames_congestion); | |
1898 | return RX_DROP_MONITOR; | |
1899 | } | |
1900 | ||
43b7b314 | 1901 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1902 | struct mesh_path *mppath; |
43b7b314 JC |
1903 | char *proxied_addr; |
1904 | char *mpp_addr; | |
1905 | ||
1906 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1907 | mpp_addr = hdr->addr3; | |
1908 | proxied_addr = mesh_hdr->eaddr1; | |
1909 | } else { | |
1910 | mpp_addr = hdr->addr4; | |
1911 | proxied_addr = mesh_hdr->eaddr2; | |
1912 | } | |
79617dee | 1913 | |
79617dee | 1914 | rcu_read_lock(); |
43b7b314 | 1915 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1916 | if (!mppath) { |
43b7b314 | 1917 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1918 | } else { |
1919 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1920 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1921 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1922 | spin_unlock_bh(&mppath->state_lock); |
1923 | } | |
1924 | rcu_read_unlock(); | |
1925 | } | |
1926 | ||
3c5772a5 JC |
1927 | /* Frame has reached destination. Don't forward */ |
1928 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1929 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1930 | return RX_CONTINUE; |
1931 | ||
1932 | mesh_hdr->ttl--; | |
1933 | ||
554891e6 | 1934 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
e32f85f7 | 1935 | if (!mesh_hdr->ttl) |
472dbc45 | 1936 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1937 | dropped_frames_ttl); |
1938 | else { | |
1939 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1940 | struct ieee80211_tx_info *info; |
1941 | ||
e32f85f7 LCC |
1942 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1943 | ||
1944 | if (!fwd_skb && net_ratelimit()) | |
1945 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1946 | sdata->name); |
919bbad5 | 1947 | if (!fwd_skb) |
b51aff05 | 1948 | goto out; |
e32f85f7 LCC |
1949 | |
1950 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1951 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1952 | info = IEEE80211_SKB_CB(fwd_skb); |
1953 | memset(info, 0, sizeof(*info)); | |
1954 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1955 | info->control.vif = &rx->sdata->vif; |
4777be41 | 1956 | if (is_multicast_ether_addr(fwd_hdr->addr1)) { |
c8a61a7d DW |
1957 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
1958 | fwded_mcast); | |
4777be41 JC |
1959 | skb_set_queue_mapping(fwd_skb, |
1960 | ieee80211_select_queue(sdata, fwd_skb)); | |
2154c81c | 1961 | ieee80211_set_qos_hdr(sdata, fwd_skb); |
4777be41 | 1962 | } else { |
3c5772a5 JC |
1963 | int err; |
1964 | /* | |
1965 | * Save TA to addr1 to send TA a path error if a | |
1966 | * suitable next hop is not found | |
1967 | */ | |
1968 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1969 | ETH_ALEN); |
3c5772a5 | 1970 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1971 | /* Failed to immediately resolve next hop: |
1972 | * fwded frame was dropped or will be added | |
1973 | * later to the pending skb queue. */ | |
1974 | if (err) | |
1975 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1976 | |
1977 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1978 | fwded_unicast); | |
249b405c JC |
1979 | } |
1980 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1981 | fwded_frames); | |
3b8d81e0 | 1982 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1983 | } |
1984 | } | |
1985 | ||
b51aff05 | 1986 | out: |
3c5772a5 | 1987 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1988 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1989 | return RX_CONTINUE; |
1990 | else | |
1991 | return RX_DROP_MONITOR; | |
1992 | } | |
bf94e17b | 1993 | #endif |
e32f85f7 | 1994 | |
49461622 | 1995 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1996 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1997 | { |
eb9fb5b8 | 1998 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1999 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 2000 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
2001 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
2002 | __le16 fc = hdr->frame_control; | |
4114fa21 | 2003 | bool port_control; |
ce3edf6d | 2004 | int err; |
76ee65bf | 2005 | |
358c8d9d | 2006 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 2007 | return RX_CONTINUE; |
76ee65bf | 2008 | |
358c8d9d | 2009 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 2010 | return RX_DROP_MONITOR; |
76ee65bf | 2011 | |
f14543ee FF |
2012 | /* |
2013 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
2014 | * that a 4-addr station can be detected and moved into a separate VLAN | |
2015 | */ | |
2016 | if (ieee80211_has_a4(hdr->frame_control) && | |
2017 | sdata->vif.type == NL80211_IFTYPE_AP) | |
2018 | return RX_DROP_MONITOR; | |
2019 | ||
4114fa21 | 2020 | err = __ieee80211_data_to_8023(rx, &port_control); |
76ee65bf | 2021 | if (unlikely(err)) |
e4c26add | 2022 | return RX_DROP_UNUSABLE; |
76ee65bf | 2023 | |
358c8d9d | 2024 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 2025 | return RX_DROP_MONITOR; |
ce3edf6d | 2026 | |
4114fa21 FF |
2027 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
2028 | unlikely(port_control) && sdata->bss) { | |
2029 | sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, | |
2030 | u.ap); | |
2031 | dev = sdata->dev; | |
2032 | rx->sdata = sdata; | |
2033 | } | |
2034 | ||
76ee65bf RR |
2035 | rx->skb->dev = dev; |
2036 | ||
2037 | dev->stats.rx_packets++; | |
2038 | dev->stats.rx_bytes += rx->skb->len; | |
2039 | ||
08ca944e | 2040 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
8c99f691 RM |
2041 | !is_multicast_ether_addr( |
2042 | ((struct ethhdr *)rx->skb->data)->h_dest) && | |
2043 | (!local->scanning && | |
2044 | !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { | |
e15276a4 VN |
2045 | mod_timer(&local->dynamic_ps_timer, jiffies + |
2046 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
2047 | } | |
2048 | ||
76ee65bf | 2049 | ieee80211_deliver_skb(rx); |
571ecf67 | 2050 | |
9ae54c84 | 2051 | return RX_QUEUED; |
571ecf67 JB |
2052 | } |
2053 | ||
49461622 | 2054 | static ieee80211_rx_result debug_noinline |
24a8fdad | 2055 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
2056 | { |
2057 | struct ieee80211_local *local = rx->local; | |
2058 | struct ieee80211_hw *hw = &local->hw; | |
2059 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 2060 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
2061 | struct tid_ampdu_rx *tid_agg_rx; |
2062 | u16 start_seq_num; | |
2063 | u16 tid; | |
2064 | ||
a7767f95 | 2065 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 2066 | return RX_CONTINUE; |
71364716 | 2067 | |
a7767f95 | 2068 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
2069 | struct { |
2070 | __le16 control, start_seq_num; | |
2071 | } __packed bar_data; | |
2072 | ||
71364716 | 2073 | if (!rx->sta) |
a02ae758 | 2074 | return RX_DROP_MONITOR; |
8ae5977f JB |
2075 | |
2076 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
2077 | &bar_data, sizeof(bar_data))) | |
2078 | return RX_DROP_MONITOR; | |
2079 | ||
8ae5977f | 2080 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
2081 | |
2082 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
2083 | if (!tid_agg_rx) | |
a02ae758 | 2084 | return RX_DROP_MONITOR; |
71364716 | 2085 | |
8ae5977f | 2086 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
2087 | |
2088 | /* reset session timer */ | |
20ad19d0 JB |
2089 | if (tid_agg_rx->timeout) |
2090 | mod_timer(&tid_agg_rx->session_timer, | |
2091 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 2092 | |
dd318575 | 2093 | spin_lock(&tid_agg_rx->reorder_lock); |
a02ae758 | 2094 | /* release stored frames up to start of BAR */ |
24a8fdad | 2095 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); |
dd318575 JB |
2096 | spin_unlock(&tid_agg_rx->reorder_lock); |
2097 | ||
a02ae758 JB |
2098 | kfree_skb(skb); |
2099 | return RX_QUEUED; | |
71364716 RR |
2100 | } |
2101 | ||
08daecae JB |
2102 | /* |
2103 | * After this point, we only want management frames, | |
2104 | * so we can drop all remaining control frames to | |
2105 | * cooked monitor interfaces. | |
2106 | */ | |
2107 | return RX_DROP_MONITOR; | |
71364716 RR |
2108 | } |
2109 | ||
f4f727a6 JM |
2110 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
2111 | struct ieee80211_mgmt *mgmt, | |
2112 | size_t len) | |
fea14732 JM |
2113 | { |
2114 | struct ieee80211_local *local = sdata->local; | |
2115 | struct sk_buff *skb; | |
2116 | struct ieee80211_mgmt *resp; | |
2117 | ||
47846c9b | 2118 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
2119 | /* Not to own unicast address */ |
2120 | return; | |
2121 | } | |
2122 | ||
46900298 JB |
2123 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
2124 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 2125 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
2126 | return; |
2127 | } | |
2128 | ||
2129 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2130 | /* Too short SA Query request frame */ | |
2131 | return; | |
2132 | } | |
2133 | ||
2134 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2135 | if (skb == NULL) | |
2136 | return; | |
2137 | ||
2138 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2139 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2140 | memset(resp, 0, 24); | |
2141 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 2142 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 2143 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
2144 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2145 | IEEE80211_STYPE_ACTION); | |
2146 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2147 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2148 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2149 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2150 | mgmt->u.action.u.sa_query.trans_id, | |
2151 | WLAN_SA_QUERY_TR_ID_LEN); | |
2152 | ||
62ae67be | 2153 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
2154 | } |
2155 | ||
2e161f78 JB |
2156 | static ieee80211_rx_result debug_noinline |
2157 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2158 | { | |
2159 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
554891e6 | 2160 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2161 | |
2162 | /* | |
2163 | * From here on, look only at management frames. | |
2164 | * Data and control frames are already handled, | |
2165 | * and unknown (reserved) frames are useless. | |
2166 | */ | |
2167 | if (rx->skb->len < 24) | |
2168 | return RX_DROP_MONITOR; | |
2169 | ||
2170 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2171 | return RX_DROP_MONITOR; | |
2172 | ||
554891e6 | 2173 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
2e161f78 JB |
2174 | return RX_DROP_MONITOR; |
2175 | ||
2176 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2177 | return RX_DROP_UNUSABLE; | |
2178 | ||
2179 | return RX_CONTINUE; | |
2180 | } | |
2181 | ||
de1ede7a JB |
2182 | static ieee80211_rx_result debug_noinline |
2183 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2184 | { | |
2185 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 2186 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 2187 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
554891e6 | 2188 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
de1ede7a JB |
2189 | int len = rx->skb->len; |
2190 | ||
2191 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2192 | return RX_CONTINUE; | |
2193 | ||
026331c4 JM |
2194 | /* drop too small frames */ |
2195 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 2196 | return RX_DROP_UNUSABLE; |
de1ede7a | 2197 | |
026331c4 | 2198 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 2199 | return RX_DROP_UNUSABLE; |
de1ede7a | 2200 | |
554891e6 | 2201 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 2202 | return RX_DROP_UNUSABLE; |
97ebe12a | 2203 | |
de1ede7a JB |
2204 | switch (mgmt->u.action.category) { |
2205 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
2206 | /* |
2207 | * The aggregation code is not prepared to handle | |
2208 | * anything but STA/AP due to the BSSID handling; | |
2209 | * IBSS could work in the code but isn't supported | |
2210 | * by drivers or the standard. | |
2211 | */ | |
2212 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2213 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2214 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 2215 | break; |
8abd3f9b | 2216 | |
026331c4 JM |
2217 | /* verify action_code is present */ |
2218 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2219 | break; | |
2220 | ||
de1ede7a JB |
2221 | switch (mgmt->u.action.u.addba_req.action_code) { |
2222 | case WLAN_ACTION_ADDBA_REQ: | |
2223 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2224 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
2225 | goto invalid; |
2226 | break; | |
de1ede7a JB |
2227 | case WLAN_ACTION_ADDBA_RESP: |
2228 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2229 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
2230 | goto invalid; |
2231 | break; | |
de1ede7a JB |
2232 | case WLAN_ACTION_DELBA: |
2233 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2234 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
2235 | goto invalid; |
2236 | break; | |
2237 | default: | |
2238 | goto invalid; | |
de1ede7a | 2239 | } |
bed7ee6e | 2240 | |
8b58ff83 | 2241 | goto queue; |
39192c0b JB |
2242 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2243 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2244 | break; |
46900298 JB |
2245 | |
2246 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2247 | break; |
46900298 | 2248 | |
026331c4 JM |
2249 | /* verify action_code is present */ |
2250 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2251 | break; | |
2252 | ||
39192c0b JB |
2253 | switch (mgmt->u.action.u.measurement.action_code) { |
2254 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2255 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2256 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2257 | break; |
39192c0b | 2258 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2259 | goto handled; |
c481ec97 S |
2260 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2261 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2262 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2263 | break; |
c481ec97 | 2264 | |
cc32abd4 | 2265 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2266 | break; |
cc32abd4 | 2267 | |
46900298 | 2268 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2269 | break; |
c481ec97 | 2270 | |
8b58ff83 | 2271 | goto queue; |
39192c0b JB |
2272 | } |
2273 | break; | |
fea14732 JM |
2274 | case WLAN_CATEGORY_SA_QUERY: |
2275 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2276 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2277 | break; |
2278 | ||
fea14732 JM |
2279 | switch (mgmt->u.action.u.sa_query.action) { |
2280 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2281 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2282 | break; |
fea14732 | 2283 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2284 | goto handled; |
fea14732 JM |
2285 | } |
2286 | break; | |
8db09850 TP |
2287 | case WLAN_CATEGORY_SELF_PROTECTED: |
2288 | switch (mgmt->u.action.u.self_prot.action_code) { | |
2289 | case WLAN_SP_MESH_PEERING_OPEN: | |
2290 | case WLAN_SP_MESH_PEERING_CLOSE: | |
2291 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
2292 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
2293 | goto invalid; | |
2294 | if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE) | |
2295 | /* userspace handles this frame */ | |
2296 | break; | |
2297 | goto queue; | |
2298 | case WLAN_SP_MGK_INFORM: | |
2299 | case WLAN_SP_MGK_ACK: | |
2300 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
2301 | goto invalid; | |
2302 | break; | |
2303 | } | |
2304 | break; | |
d3aaec8a | 2305 | case WLAN_CATEGORY_MESH_ACTION: |
77a121c3 JB |
2306 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2307 | break; | |
25d49e4d TP |
2308 | if (mesh_action_is_path_sel(mgmt) && |
2309 | (!mesh_path_sel_is_hwmp(sdata))) | |
c7108a71 JC |
2310 | break; |
2311 | goto queue; | |
84040805 | 2312 | } |
026331c4 | 2313 | |
2e161f78 JB |
2314 | return RX_CONTINUE; |
2315 | ||
bed7ee6e | 2316 | invalid: |
554891e6 | 2317 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
2e161f78 JB |
2318 | /* will return in the next handlers */ |
2319 | return RX_CONTINUE; | |
2320 | ||
2321 | handled: | |
2322 | if (rx->sta) | |
2323 | rx->sta->rx_packets++; | |
2324 | dev_kfree_skb(rx->skb); | |
2325 | return RX_QUEUED; | |
2326 | ||
2327 | queue: | |
2328 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2329 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2330 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2331 | if (rx->sta) | |
2332 | rx->sta->rx_packets++; | |
2333 | return RX_QUEUED; | |
2334 | } | |
2335 | ||
2336 | static ieee80211_rx_result debug_noinline | |
2337 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2338 | { | |
554891e6 | 2339 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2340 | |
2341 | /* skip known-bad action frames and return them in the next handler */ | |
554891e6 | 2342 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
2e161f78 | 2343 | return RX_CONTINUE; |
d7907448 | 2344 | |
026331c4 JM |
2345 | /* |
2346 | * Getting here means the kernel doesn't know how to handle | |
2347 | * it, but maybe userspace does ... include returned frames | |
2348 | * so userspace can register for those to know whether ones | |
2349 | * it transmitted were processed or returned. | |
2350 | */ | |
026331c4 | 2351 | |
2e161f78 JB |
2352 | if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, |
2353 | rx->skb->data, rx->skb->len, | |
2354 | GFP_ATOMIC)) { | |
2355 | if (rx->sta) | |
2356 | rx->sta->rx_packets++; | |
2357 | dev_kfree_skb(rx->skb); | |
2358 | return RX_QUEUED; | |
2359 | } | |
2360 | ||
2361 | ||
2362 | return RX_CONTINUE; | |
2363 | } | |
2364 | ||
2365 | static ieee80211_rx_result debug_noinline | |
2366 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2367 | { | |
2368 | struct ieee80211_local *local = rx->local; | |
2369 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2370 | struct sk_buff *nskb; | |
2371 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
554891e6 | 2372 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2373 | |
2374 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2375 | return RX_CONTINUE; | |
2376 | ||
2377 | /* | |
2378 | * For AP mode, hostapd is responsible for handling any action | |
2379 | * frames that we didn't handle, including returning unknown | |
2380 | * ones. For all other modes we will return them to the sender, | |
2381 | * setting the 0x80 bit in the action category, as required by | |
2382 | * 802.11-2007 7.3.1.11. | |
2383 | * Newer versions of hostapd shall also use the management frame | |
2384 | * registration mechanisms, but older ones still use cooked | |
2385 | * monitor interfaces so push all frames there. | |
2386 | */ | |
554891e6 | 2387 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
2e161f78 JB |
2388 | (sdata->vif.type == NL80211_IFTYPE_AP || |
2389 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2390 | return RX_DROP_MONITOR; | |
026331c4 | 2391 | |
84040805 JB |
2392 | /* do not return rejected action frames */ |
2393 | if (mgmt->u.action.category & 0x80) | |
2394 | return RX_DROP_UNUSABLE; | |
2395 | ||
2396 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2397 | GFP_ATOMIC); | |
2398 | if (nskb) { | |
292b4df6 | 2399 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2400 | |
292b4df6 JL |
2401 | nmgmt->u.action.category |= 0x80; |
2402 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2403 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2404 | |
2405 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2406 | ||
2407 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a | 2408 | } |
39192c0b JB |
2409 | dev_kfree_skb(rx->skb); |
2410 | return RX_QUEUED; | |
de1ede7a JB |
2411 | } |
2412 | ||
49461622 | 2413 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2414 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2415 | { |
eb9fb5b8 | 2416 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2417 | ieee80211_rx_result rxs; |
77a121c3 JB |
2418 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2419 | __le16 stype; | |
571ecf67 | 2420 | |
af6b6374 JB |
2421 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2422 | if (rxs != RX_CONTINUE) | |
2423 | return rxs; | |
2424 | ||
77a121c3 | 2425 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2426 | |
77a121c3 JB |
2427 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2428 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2429 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2430 | return RX_DROP_MONITOR; | |
472dbc45 | 2431 | |
77a121c3 JB |
2432 | switch (stype) { |
2433 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2434 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2435 | /* process for all: mesh, mlme, ibss */ | |
2436 | break; | |
2437 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2438 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2c31333a CL |
2439 | if (is_multicast_ether_addr(mgmt->da) && |
2440 | !is_broadcast_ether_addr(mgmt->da)) | |
2441 | return RX_DROP_MONITOR; | |
2442 | ||
77a121c3 JB |
2443 | /* process only for station */ |
2444 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2445 | return RX_DROP_MONITOR; | |
2446 | break; | |
2447 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2448 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2449 | /* process only for ibss */ | |
2450 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2451 | return RX_DROP_MONITOR; | |
2452 | break; | |
2453 | default: | |
2454 | return RX_DROP_MONITOR; | |
2455 | } | |
f9d540ee | 2456 | |
77a121c3 | 2457 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2458 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2459 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2460 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2461 | if (rx->sta) |
2462 | rx->sta->rx_packets++; | |
46900298 | 2463 | |
77a121c3 | 2464 | return RX_QUEUED; |
571ecf67 JB |
2465 | } |
2466 | ||
5cf121c3 | 2467 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2468 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2469 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2470 | { |
2471 | struct ieee80211_sub_if_data *sdata; | |
2472 | struct ieee80211_local *local = rx->local; | |
2473 | struct ieee80211_rtap_hdr { | |
2474 | struct ieee80211_radiotap_header hdr; | |
2475 | u8 flags; | |
5f0b7de5 | 2476 | u8 rate_or_pad; |
3d30d949 MW |
2477 | __le16 chan_freq; |
2478 | __le16 chan_flags; | |
bc10502d | 2479 | } __packed *rthdr; |
3d30d949 MW |
2480 | struct sk_buff *skb = rx->skb, *skb2; |
2481 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2482 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2483 | |
554891e6 JB |
2484 | /* |
2485 | * If cooked monitor has been processed already, then | |
2486 | * don't do it again. If not, set the flag. | |
2487 | */ | |
2488 | if (rx->flags & IEEE80211_RX_CMNTR) | |
7c1e1831 | 2489 | goto out_free_skb; |
554891e6 | 2490 | rx->flags |= IEEE80211_RX_CMNTR; |
7c1e1831 | 2491 | |
152c477a JB |
2492 | /* If there are no cooked monitor interfaces, just free the SKB */ |
2493 | if (!local->cooked_mntrs) | |
2494 | goto out_free_skb; | |
2495 | ||
3d30d949 MW |
2496 | if (skb_headroom(skb) < sizeof(*rthdr) && |
2497 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2498 | goto out_free_skb; | |
2499 | ||
2500 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2501 | memset(rthdr, 0, sizeof(*rthdr)); | |
2502 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2503 | rthdr->hdr.it_present = | |
2504 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2505 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2506 | ||
5f0b7de5 JB |
2507 | if (rate) { |
2508 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2509 | rthdr->hdr.it_present |= | |
2510 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2511 | } | |
3d30d949 MW |
2512 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2513 | ||
2514 | if (status->band == IEEE80211_BAND_5GHZ) | |
2515 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2516 | IEEE80211_CHAN_5GHZ); | |
2517 | else | |
2518 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2519 | IEEE80211_CHAN_2GHZ); | |
2520 | ||
2521 | skb_set_mac_header(skb, 0); | |
2522 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2523 | skb->pkt_type = PACKET_OTHERHOST; | |
2524 | skb->protocol = htons(ETH_P_802_2); | |
2525 | ||
2526 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2527 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2528 | continue; |
2529 | ||
05c914fe | 2530 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2531 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2532 | continue; | |
2533 | ||
2534 | if (prev_dev) { | |
2535 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2536 | if (skb2) { | |
2537 | skb2->dev = prev_dev; | |
5548a8a1 | 2538 | netif_receive_skb(skb2); |
3d30d949 MW |
2539 | } |
2540 | } | |
2541 | ||
2542 | prev_dev = sdata->dev; | |
2543 | sdata->dev->stats.rx_packets++; | |
2544 | sdata->dev->stats.rx_bytes += skb->len; | |
2545 | } | |
2546 | ||
2547 | if (prev_dev) { | |
2548 | skb->dev = prev_dev; | |
5548a8a1 | 2549 | netif_receive_skb(skb); |
554891e6 JB |
2550 | return; |
2551 | } | |
3d30d949 MW |
2552 | |
2553 | out_free_skb: | |
2554 | dev_kfree_skb(skb); | |
2555 | } | |
2556 | ||
aa0c8636 CL |
2557 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2558 | ieee80211_rx_result res) | |
2559 | { | |
2560 | switch (res) { | |
2561 | case RX_DROP_MONITOR: | |
2562 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2563 | if (rx->sta) | |
2564 | rx->sta->rx_dropped++; | |
2565 | /* fall through */ | |
2566 | case RX_CONTINUE: { | |
2567 | struct ieee80211_rate *rate = NULL; | |
2568 | struct ieee80211_supported_band *sband; | |
2569 | struct ieee80211_rx_status *status; | |
2570 | ||
2571 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2572 | ||
2573 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2574 | if (!(status->flag & RX_FLAG_HT)) | |
2575 | rate = &sband->bitrates[status->rate_idx]; | |
2576 | ||
2577 | ieee80211_rx_cooked_monitor(rx, rate); | |
2578 | break; | |
2579 | } | |
2580 | case RX_DROP_UNUSABLE: | |
2581 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2582 | if (rx->sta) | |
2583 | rx->sta->rx_dropped++; | |
2584 | dev_kfree_skb(rx->skb); | |
2585 | break; | |
2586 | case RX_QUEUED: | |
2587 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2588 | break; | |
2589 | } | |
2590 | } | |
571ecf67 | 2591 | |
24a8fdad | 2592 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) |
58905290 | 2593 | { |
58905290 | 2594 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2595 | struct sk_buff *skb; |
8944b79f | 2596 | |
e32f85f7 LCC |
2597 | #define CALL_RXH(rxh) \ |
2598 | do { \ | |
2599 | res = rxh(rx); \ | |
2600 | if (res != RX_CONTINUE) \ | |
2569a826 | 2601 | goto rxh_next; \ |
e32f85f7 | 2602 | } while (0); |
49461622 | 2603 | |
24a8fdad CL |
2604 | spin_lock(&rx->local->rx_skb_queue.lock); |
2605 | if (rx->local->running_rx_handler) | |
2606 | goto unlock; | |
2607 | ||
2608 | rx->local->running_rx_handler = true; | |
2609 | ||
2610 | while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { | |
2611 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2612 | ||
2569a826 JB |
2613 | /* |
2614 | * all the other fields are valid across frames | |
2615 | * that belong to an aMPDU since they are on the | |
2616 | * same TID from the same station | |
2617 | */ | |
2618 | rx->skb = skb; | |
2619 | ||
2620 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2621 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
47086fc5 | 2622 | CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll) |
2569a826 JB |
2623 | CALL_RXH(ieee80211_rx_h_sta_process) |
2624 | CALL_RXH(ieee80211_rx_h_defragment) | |
2569a826 JB |
2625 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) |
2626 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
bf94e17b | 2627 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2628 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2629 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2630 | #endif |
2154c81c JC |
2631 | CALL_RXH(ieee80211_rx_h_remove_qos_control) |
2632 | CALL_RXH(ieee80211_rx_h_amsdu) | |
2569a826 | 2633 | CALL_RXH(ieee80211_rx_h_data) |
24a8fdad | 2634 | CALL_RXH(ieee80211_rx_h_ctrl); |
2e161f78 | 2635 | CALL_RXH(ieee80211_rx_h_mgmt_check) |
2569a826 | 2636 | CALL_RXH(ieee80211_rx_h_action) |
2e161f78 JB |
2637 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) |
2638 | CALL_RXH(ieee80211_rx_h_action_return) | |
2569a826 | 2639 | CALL_RXH(ieee80211_rx_h_mgmt) |
49461622 | 2640 | |
aa0c8636 CL |
2641 | rxh_next: |
2642 | ieee80211_rx_handlers_result(rx, res); | |
24a8fdad | 2643 | spin_lock(&rx->local->rx_skb_queue.lock); |
49461622 | 2644 | #undef CALL_RXH |
aa0c8636 | 2645 | } |
24a8fdad CL |
2646 | |
2647 | rx->local->running_rx_handler = false; | |
2648 | ||
2649 | unlock: | |
2650 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
aa0c8636 CL |
2651 | } |
2652 | ||
4406c376 | 2653 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
aa0c8636 | 2654 | { |
aa0c8636 CL |
2655 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2656 | ||
aa0c8636 CL |
2657 | #define CALL_RXH(rxh) \ |
2658 | do { \ | |
2659 | res = rxh(rx); \ | |
2660 | if (res != RX_CONTINUE) \ | |
2661 | goto rxh_next; \ | |
2662 | } while (0); | |
2663 | ||
2664 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2665 | CALL_RXH(ieee80211_rx_h_check) | |
2666 | ||
24a8fdad | 2667 | ieee80211_rx_reorder_ampdu(rx); |
aa0c8636 | 2668 | |
24a8fdad | 2669 | ieee80211_rx_handlers(rx); |
aa0c8636 | 2670 | return; |
49461622 | 2671 | |
2569a826 | 2672 | rxh_next: |
aa0c8636 CL |
2673 | ieee80211_rx_handlers_result(rx, res); |
2674 | ||
2675 | #undef CALL_RXH | |
58905290 JB |
2676 | } |
2677 | ||
2bff8ebf | 2678 | /* |
dd318575 JB |
2679 | * This function makes calls into the RX path, therefore |
2680 | * it has to be invoked under RCU read lock. | |
2bff8ebf CL |
2681 | */ |
2682 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2683 | { | |
554891e6 JB |
2684 | struct ieee80211_rx_data rx = { |
2685 | .sta = sta, | |
2686 | .sdata = sta->sdata, | |
2687 | .local = sta->local, | |
9e26297a JB |
2688 | /* This is OK -- must be QoS data frame */ |
2689 | .security_idx = tid, | |
2690 | .seqno_idx = tid, | |
fcf8bd3b | 2691 | .flags = 0, |
554891e6 | 2692 | }; |
2c15a0cf CL |
2693 | struct tid_ampdu_rx *tid_agg_rx; |
2694 | ||
2695 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2696 | if (!tid_agg_rx) | |
2697 | return; | |
2bff8ebf | 2698 | |
2c15a0cf | 2699 | spin_lock(&tid_agg_rx->reorder_lock); |
24a8fdad | 2700 | ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); |
2c15a0cf | 2701 | spin_unlock(&tid_agg_rx->reorder_lock); |
2bff8ebf | 2702 | |
24a8fdad | 2703 | ieee80211_rx_handlers(&rx); |
2bff8ebf CL |
2704 | } |
2705 | ||
571ecf67 JB |
2706 | /* main receive path */ |
2707 | ||
20b01f80 | 2708 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
23a24def JB |
2709 | struct ieee80211_hdr *hdr) |
2710 | { | |
20b01f80 | 2711 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
eb9fb5b8 JB |
2712 | struct sk_buff *skb = rx->skb; |
2713 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2714 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2715 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2716 | ||
51fb61e7 | 2717 | switch (sdata->vif.type) { |
05c914fe | 2718 | case NL80211_IFTYPE_STATION: |
9bc383de | 2719 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2720 | return 0; |
77fdaa12 | 2721 | if (!multicast && |
47846c9b | 2722 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4f312336 FF |
2723 | if (!(sdata->dev->flags & IFF_PROMISC) || |
2724 | sdata->u.mgd.use_4addr) | |
23a24def | 2725 | return 0; |
554891e6 | 2726 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2727 | } |
2728 | break; | |
05c914fe | 2729 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2730 | if (!bssid) |
2731 | return 0; | |
a7767f95 | 2732 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2733 | return 1; |
87291c02 | 2734 | } |
46900298 | 2735 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
554891e6 | 2736 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2737 | return 0; |
554891e6 | 2738 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2739 | } else if (!multicast && |
47846c9b | 2740 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2741 | hdr->addr1) != 0) { |
4150c572 | 2742 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2743 | return 0; |
554891e6 | 2744 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2745 | } else if (!rx->sta) { |
2746 | int rate_idx; | |
eb9fb5b8 | 2747 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2748 | rate_idx = 0; /* TODO: HT rates */ |
2749 | else | |
eb9fb5b8 | 2750 | rate_idx = status->rate_idx; |
34e89507 JB |
2751 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2752 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2753 | } |
23a24def | 2754 | break; |
05c914fe | 2755 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2756 | if (!multicast && |
47846c9b | 2757 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2758 | hdr->addr1) != 0) { |
2759 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2760 | return 0; | |
2761 | ||
554891e6 | 2762 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2763 | } |
2764 | break; | |
05c914fe JB |
2765 | case NL80211_IFTYPE_AP_VLAN: |
2766 | case NL80211_IFTYPE_AP: | |
23a24def | 2767 | if (!bssid) { |
47846c9b | 2768 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2769 | hdr->addr1)) |
2770 | return 0; | |
2771 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2772 | sdata->vif.addr)) { |
771bbd09 | 2773 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && |
a21fa87e AN |
2774 | !ieee80211_is_beacon(hdr->frame_control) && |
2775 | !(ieee80211_is_action(hdr->frame_control) && | |
2776 | sdata->vif.p2p)) | |
23a24def | 2777 | return 0; |
554891e6 | 2778 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2779 | } |
23a24def | 2780 | break; |
05c914fe | 2781 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2782 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2783 | return 0; |
2784 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2785 | return 0; | |
2786 | break; | |
2ca27bcf | 2787 | default: |
fb1c1cd6 JB |
2788 | /* should never get here */ |
2789 | WARN_ON(1); | |
2790 | break; | |
23a24def JB |
2791 | } |
2792 | ||
2793 | return 1; | |
2794 | } | |
2795 | ||
4406c376 JB |
2796 | /* |
2797 | * This function returns whether or not the SKB | |
2798 | * was destined for RX processing or not, which, | |
2799 | * if consume is true, is equivalent to whether | |
2800 | * or not the skb was consumed. | |
2801 | */ | |
2802 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2803 | struct sk_buff *skb, bool consume) | |
2804 | { | |
2805 | struct ieee80211_local *local = rx->local; | |
2806 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2807 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2808 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2809 | int prepares; | |
2810 | ||
2811 | rx->skb = skb; | |
554891e6 | 2812 | status->rx_flags |= IEEE80211_RX_RA_MATCH; |
4406c376 JB |
2813 | prepares = prepare_for_handlers(rx, hdr); |
2814 | ||
2815 | if (!prepares) | |
2816 | return false; | |
2817 | ||
4406c376 JB |
2818 | if (!consume) { |
2819 | skb = skb_copy(skb, GFP_ATOMIC); | |
2820 | if (!skb) { | |
2821 | if (net_ratelimit()) | |
2822 | wiphy_debug(local->hw.wiphy, | |
b305dae4 | 2823 | "failed to copy skb for %s\n", |
4406c376 JB |
2824 | sdata->name); |
2825 | return true; | |
2826 | } | |
2827 | ||
2828 | rx->skb = skb; | |
2829 | } | |
2830 | ||
2831 | ieee80211_invoke_rx_handlers(rx); | |
2832 | return true; | |
2833 | } | |
2834 | ||
571ecf67 | 2835 | /* |
6368e4b1 RR |
2836 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2837 | * be called with rcu_read_lock protection. | |
571ecf67 | 2838 | */ |
71ebb4aa | 2839 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2840 | struct sk_buff *skb) |
571ecf67 | 2841 | { |
554891e6 | 2842 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2843 | struct ieee80211_local *local = hw_to_local(hw); |
2844 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2845 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2846 | __le16 fc; |
5cf121c3 | 2847 | struct ieee80211_rx_data rx; |
4406c376 | 2848 | struct ieee80211_sub_if_data *prev; |
56af3268 | 2849 | struct sta_info *sta, *tmp, *prev_sta; |
e3cf8b3f | 2850 | int err = 0; |
571ecf67 | 2851 | |
e3cf8b3f | 2852 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2853 | memset(&rx, 0, sizeof(rx)); |
2854 | rx.skb = skb; | |
2855 | rx.local = local; | |
72abd81b | 2856 | |
e3cf8b3f | 2857 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2858 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2859 | |
142b9f50 | 2860 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
b23b025f | 2861 | test_bit(SCAN_SW_SCANNING, &local->scanning))) |
554891e6 | 2862 | status->rx_flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2863 | |
e3cf8b3f ZY |
2864 | if (ieee80211_is_mgmt(fc)) |
2865 | err = skb_linearize(skb); | |
2866 | else | |
2867 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2868 | ||
2869 | if (err) { | |
2870 | dev_kfree_skb(skb); | |
2871 | return; | |
2872 | } | |
2873 | ||
2874 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2875 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2876 | ieee80211_verify_alignment(&rx); |
38f3714d | 2877 | |
e3cf8b3f | 2878 | if (ieee80211_is_data(fc)) { |
56af3268 | 2879 | prev_sta = NULL; |
4406c376 | 2880 | |
2a33bee2 | 2881 | for_each_sta_info_rx(local, hdr->addr2, sta, tmp) { |
56af3268 BG |
2882 | if (!prev_sta) { |
2883 | prev_sta = sta; | |
2884 | continue; | |
2885 | } | |
2886 | ||
2887 | rx.sta = prev_sta; | |
2888 | rx.sdata = prev_sta->sdata; | |
4406c376 | 2889 | ieee80211_prepare_and_rx_handle(&rx, skb, false); |
abe60632 | 2890 | |
56af3268 | 2891 | prev_sta = sta; |
4406c376 | 2892 | } |
56af3268 BG |
2893 | |
2894 | if (prev_sta) { | |
2895 | rx.sta = prev_sta; | |
2896 | rx.sdata = prev_sta->sdata; | |
2897 | ||
4406c376 | 2898 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
56af3268 | 2899 | return; |
8e26d5ad | 2900 | goto out; |
56af3268 | 2901 | } |
4406c376 JB |
2902 | } |
2903 | ||
4b0dd98e | 2904 | prev = NULL; |
b2e7771e | 2905 | |
4b0dd98e JB |
2906 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2907 | if (!ieee80211_sdata_running(sdata)) | |
2908 | continue; | |
340e11f3 | 2909 | |
4b0dd98e JB |
2910 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2911 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2912 | continue; | |
340e11f3 | 2913 | |
4b0dd98e JB |
2914 | /* |
2915 | * frame is destined for this interface, but if it's | |
2916 | * not also for the previous one we handle that after | |
2917 | * the loop to avoid copying the SKB once too much | |
2918 | */ | |
4bb29f8c | 2919 | |
4b0dd98e | 2920 | if (!prev) { |
abe60632 | 2921 | prev = sdata; |
4b0dd98e | 2922 | continue; |
340e11f3 | 2923 | } |
4bb29f8c | 2924 | |
2a33bee2 | 2925 | rx.sta = sta_info_get_bss_rx(prev, hdr->addr2); |
4b0dd98e JB |
2926 | rx.sdata = prev; |
2927 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
4bb29f8c | 2928 | |
4b0dd98e JB |
2929 | prev = sdata; |
2930 | } | |
2931 | ||
2932 | if (prev) { | |
2a33bee2 | 2933 | rx.sta = sta_info_get_bss_rx(prev, hdr->addr2); |
4b0dd98e | 2934 | rx.sdata = prev; |
4406c376 | 2935 | |
4b0dd98e JB |
2936 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
2937 | return; | |
571ecf67 | 2938 | } |
4406c376 | 2939 | |
8e26d5ad | 2940 | out: |
4406c376 | 2941 | dev_kfree_skb(skb); |
571ecf67 | 2942 | } |
6368e4b1 RR |
2943 | |
2944 | /* | |
2945 | * This is the receive path handler. It is called by a low level driver when an | |
2946 | * 802.11 MPDU is received from the hardware. | |
2947 | */ | |
103bf9f7 | 2948 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2949 | { |
2950 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2951 | struct ieee80211_rate *rate = NULL; |
2952 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2953 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2954 | |
d20ef63d JB |
2955 | WARN_ON_ONCE(softirq_count() == 0); |
2956 | ||
77a980dc JB |
2957 | if (WARN_ON(status->band < 0 || |
2958 | status->band >= IEEE80211_NUM_BANDS)) | |
2959 | goto drop; | |
8318d78a JB |
2960 | |
2961 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2962 | if (WARN_ON(!sband)) |
2963 | goto drop; | |
8318d78a | 2964 | |
89c3a8ac JB |
2965 | /* |
2966 | * If we're suspending, it is possible although not too likely | |
2967 | * that we'd be receiving frames after having already partially | |
2968 | * quiesced the stack. We can't process such frames then since | |
2969 | * that might, for example, cause stations to be added or other | |
2970 | * driver callbacks be invoked. | |
2971 | */ | |
77a980dc JB |
2972 | if (unlikely(local->quiescing || local->suspended)) |
2973 | goto drop; | |
89c3a8ac | 2974 | |
ea77f12f JB |
2975 | /* |
2976 | * The same happens when we're not even started, | |
2977 | * but that's worth a warning. | |
2978 | */ | |
77a980dc JB |
2979 | if (WARN_ON(!local->started)) |
2980 | goto drop; | |
ea77f12f | 2981 | |
fc885189 | 2982 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 2983 | /* |
fc885189 JB |
2984 | * Validate the rate, unless a PLCP error means that |
2985 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 2986 | */ |
fc885189 JB |
2987 | |
2988 | if (status->flag & RX_FLAG_HT) { | |
2989 | /* | |
2990 | * rate_idx is MCS index, which can be [0-76] | |
2991 | * as documented on: | |
2992 | * | |
2993 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2994 | * | |
2995 | * Anything else would be some sort of driver or | |
2996 | * hardware error. The driver should catch hardware | |
2997 | * errors. | |
2998 | */ | |
2999 | if (WARN((status->rate_idx < 0 || | |
3000 | status->rate_idx > 76), | |
3001 | "Rate marked as an HT rate but passed " | |
3002 | "status->rate_idx is not " | |
3003 | "an MCS index [0-76]: %d (0x%02x)\n", | |
3004 | status->rate_idx, | |
3005 | status->rate_idx)) | |
3006 | goto drop; | |
3007 | } else { | |
3008 | if (WARN_ON(status->rate_idx < 0 || | |
3009 | status->rate_idx >= sband->n_bitrates)) | |
3010 | goto drop; | |
3011 | rate = &sband->bitrates[status->rate_idx]; | |
3012 | } | |
0fb8ca45 | 3013 | } |
6368e4b1 | 3014 | |
554891e6 JB |
3015 | status->rx_flags = 0; |
3016 | ||
6368e4b1 RR |
3017 | /* |
3018 | * key references and virtual interfaces are protected using RCU | |
3019 | * and this requires that we are in a read-side RCU section during | |
3020 | * receive processing | |
3021 | */ | |
3022 | rcu_read_lock(); | |
3023 | ||
3024 | /* | |
3025 | * Frames with failed FCS/PLCP checksum are not returned, | |
3026 | * all other frames are returned without radiotap header | |
3027 | * if it was previously present. | |
3028 | * Also, frames with less than 16 bytes are dropped. | |
3029 | */ | |
f1d58c25 | 3030 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
3031 | if (!skb) { |
3032 | rcu_read_unlock(); | |
3033 | return; | |
3034 | } | |
3035 | ||
e1e54068 JB |
3036 | ieee80211_tpt_led_trig_rx(local, |
3037 | ((struct ieee80211_hdr *)skb->data)->frame_control, | |
3038 | skb->len); | |
071d9ac2 | 3039 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
3040 | |
3041 | rcu_read_unlock(); | |
77a980dc JB |
3042 | |
3043 | return; | |
3044 | drop: | |
3045 | kfree_skb(skb); | |
6368e4b1 | 3046 | } |
103bf9f7 | 3047 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
3048 | |
3049 | /* This is a version of the rx handler that can be called from hard irq | |
3050 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 3051 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
3052 | { |
3053 | struct ieee80211_local *local = hw_to_local(hw); | |
3054 | ||
3055 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
3056 | ||
571ecf67 JB |
3057 | skb->pkt_type = IEEE80211_RX_MSG; |
3058 | skb_queue_tail(&local->skb_queue, skb); | |
3059 | tasklet_schedule(&local->tasklet); | |
3060 | } | |
3061 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |