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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); |
6e0d114d JB |
334 | int tid; |
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 HH |
340 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
341 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
554891e6 | 342 | status->rx_flags |= IEEE80211_RX_AMSDU; |
6e0d114d | 343 | } else { |
1411f9b5 JB |
344 | /* |
345 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
346 | * | |
347 | * Sequence numbers for management frames, QoS data | |
348 | * frames with a broadcast/multicast address in the | |
349 | * Address 1 field, and all non-QoS data frames sent | |
350 | * by QoS STAs are assigned using an additional single | |
351 | * modulo-4096 counter, [...] | |
352 | * | |
353 | * We also use that counter for non-QoS STAs. | |
354 | */ | |
355 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 356 | } |
52865dfd | 357 | |
5cf121c3 | 358 | rx->queue = tid; |
6e0d114d JB |
359 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
360 | * For now, set skb->priority to 0 for other cases. */ | |
361 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 362 | } |
6e0d114d | 363 | |
d1c3a37c JB |
364 | /** |
365 | * DOC: Packet alignment | |
366 | * | |
367 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
368 | * to the stack. | |
369 | * | |
370 | * Additionally, should, if possible, align the payload data in a way that | |
371 | * guarantees that the contained IP header is aligned to a four-byte | |
372 | * boundary. In the case of regular frames, this simply means aligning the | |
373 | * payload to a four-byte boundary (because either the IP header is directly | |
374 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
375 | * in front of it). If the payload data is not properly aligned and the |
376 | * architecture doesn't support efficient unaligned operations, mac80211 | |
377 | * will align the data. | |
d1c3a37c JB |
378 | * |
379 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
380 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
381 | * push the IP header further back to a multiple of four again. Thankfully, the | |
382 | * specs were sane enough this time around to require padding each A-MSDU | |
383 | * subframe to a length that is a multiple of four. | |
384 | * | |
385 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
386 | * the payload is not supported, the driver is required to move the 802.11 | |
387 | * header to be directly in front of the payload in that case. | |
388 | */ | |
389 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 390 | { |
59d9cb07 KV |
391 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
392 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
393 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 394 | #endif |
6e0d114d JB |
395 | } |
396 | ||
6368e4b1 | 397 | |
571ecf67 JB |
398 | /* rx handlers */ |
399 | ||
49461622 | 400 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 401 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
402 | { |
403 | struct ieee80211_local *local = rx->local; | |
554891e6 | 404 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
405 | struct sk_buff *skb = rx->skb; |
406 | ||
554891e6 | 407 | if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN))) |
4080c7cd JB |
408 | return RX_CONTINUE; |
409 | ||
b23b025f BG |
410 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) || |
411 | test_bit(SCAN_SW_SCANNING, &local->scanning)) | |
f1d58c25 | 412 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 413 | |
4080c7cd JB |
414 | /* scanning finished during invoking of handlers */ |
415 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
416 | return RX_DROP_UNUSABLE; | |
571ecf67 JB |
417 | } |
418 | ||
3cfcf6ac JM |
419 | |
420 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
421 | { | |
422 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
423 | ||
424 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
425 | return 0; | |
426 | ||
427 | return ieee80211_is_robust_mgmt_frame(hdr); | |
428 | } | |
429 | ||
430 | ||
431 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
432 | { | |
433 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
434 | ||
435 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
436 | return 0; | |
437 | ||
438 | return ieee80211_is_robust_mgmt_frame(hdr); | |
439 | } | |
440 | ||
441 | ||
442 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
443 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
444 | { | |
445 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
446 | struct ieee80211_mmie *mmie; | |
447 | ||
448 | if (skb->len < 24 + sizeof(*mmie) || | |
449 | !is_multicast_ether_addr(hdr->da)) | |
450 | return -1; | |
451 | ||
452 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
453 | return -1; /* not a robust management frame */ | |
454 | ||
455 | mmie = (struct ieee80211_mmie *) | |
456 | (skb->data + skb->len - sizeof(*mmie)); | |
457 | if (mmie->element_id != WLAN_EID_MMIE || | |
458 | mmie->length != sizeof(*mmie) - 2) | |
459 | return -1; | |
460 | ||
461 | return le16_to_cpu(mmie->key_id); | |
462 | } | |
463 | ||
464 | ||
33b64eb2 | 465 | static ieee80211_rx_result |
5cf121c3 | 466 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 467 | { |
a7767f95 HH |
468 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
469 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 470 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 471 | |
a7767f95 | 472 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
473 | if (is_multicast_ether_addr(hdr->addr1)) { |
474 | if (ieee80211_has_tods(hdr->frame_control) || | |
475 | !ieee80211_has_fromds(hdr->frame_control)) | |
476 | return RX_DROP_MONITOR; | |
477 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
478 | return RX_DROP_MONITOR; | |
479 | } else { | |
480 | if (!ieee80211_has_a4(hdr->frame_control)) | |
481 | return RX_DROP_MONITOR; | |
482 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
483 | return RX_DROP_MONITOR; | |
484 | } | |
33b64eb2 LCC |
485 | } |
486 | ||
487 | /* If there is not an established peer link and this is not a peer link | |
488 | * establisment frame, beacon or probe, drop the frame. | |
489 | */ | |
490 | ||
b4e08ea1 | 491 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 492 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 493 | |
a7767f95 | 494 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
495 | return RX_DROP_MONITOR; |
496 | ||
a7767f95 | 497 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 498 | mgmt = (struct ieee80211_mgmt *)hdr; |
97ad9139 | 499 | if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK) |
33b64eb2 | 500 | return RX_DROP_MONITOR; |
33b64eb2 | 501 | return RX_CONTINUE; |
33b64eb2 LCC |
502 | } |
503 | ||
a7767f95 HH |
504 | if (ieee80211_is_probe_req(hdr->frame_control) || |
505 | ieee80211_is_probe_resp(hdr->frame_control) || | |
71839121 JC |
506 | ieee80211_is_beacon(hdr->frame_control) || |
507 | ieee80211_is_auth(hdr->frame_control)) | |
a7767f95 HH |
508 | return RX_CONTINUE; |
509 | ||
510 | return RX_DROP_MONITOR; | |
511 | ||
512 | } | |
513 | ||
514 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
515 | ||
516 | if (ieee80211_is_data(hdr->frame_control) && | |
517 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 518 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 519 | return RX_DROP_MONITOR; |
902acc78 | 520 | #undef msh_h_get |
d6d1a5a7 | 521 | |
902acc78 JB |
522 | return RX_CONTINUE; |
523 | } | |
33b64eb2 | 524 | |
1edfb1af JB |
525 | #define SEQ_MODULO 0x1000 |
526 | #define SEQ_MASK 0xfff | |
527 | ||
528 | static inline int seq_less(u16 sq1, u16 sq2) | |
529 | { | |
530 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
531 | } | |
532 | ||
533 | static inline u16 seq_inc(u16 sq) | |
534 | { | |
535 | return (sq + 1) & SEQ_MASK; | |
536 | } | |
537 | ||
538 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
539 | { | |
540 | return (sq1 - sq2) & SEQ_MASK; | |
541 | } | |
542 | ||
543 | ||
544 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
545 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 546 | int index) |
1edfb1af | 547 | { |
24a8fdad | 548 | struct ieee80211_local *local = hw_to_local(hw); |
1edfb1af | 549 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
4cfda47b | 550 | struct ieee80211_rx_status *status; |
1edfb1af | 551 | |
dd318575 JB |
552 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
553 | ||
1edfb1af JB |
554 | if (!skb) |
555 | goto no_frame; | |
556 | ||
071d9ac2 | 557 | /* release the frame from the reorder ring buffer */ |
1edfb1af JB |
558 | tid_agg_rx->stored_mpdu_num--; |
559 | tid_agg_rx->reorder_buf[index] = NULL; | |
4cfda47b CL |
560 | status = IEEE80211_SKB_RXCB(skb); |
561 | status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; | |
24a8fdad | 562 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af JB |
563 | |
564 | no_frame: | |
565 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
566 | } | |
567 | ||
568 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
569 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 570 | u16 head_seq_num) |
1edfb1af JB |
571 | { |
572 | int index; | |
573 | ||
dd318575 JB |
574 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
575 | ||
1edfb1af JB |
576 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
577 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
578 | tid_agg_rx->buf_size; | |
24a8fdad | 579 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
1edfb1af JB |
580 | } |
581 | } | |
582 | ||
583 | /* | |
584 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
585 | * the skb was added to the buffer longer than this time ago, the earlier | |
586 | * frames that have not yet been received are assumed to be lost and the skb | |
587 | * can be released for processing. This may also release other skb's from the | |
588 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
589 | * |
590 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
591 | */ |
592 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
593 | ||
aa0c8636 | 594 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
24a8fdad | 595 | struct tid_ampdu_rx *tid_agg_rx) |
aa0c8636 | 596 | { |
2bff8ebf | 597 | int index, j; |
aa0c8636 | 598 | |
dd318575 JB |
599 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
600 | ||
aa0c8636 CL |
601 | /* release the buffer until next missing frame */ |
602 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
603 | tid_agg_rx->buf_size; | |
604 | if (!tid_agg_rx->reorder_buf[index] && | |
605 | tid_agg_rx->stored_mpdu_num > 1) { | |
606 | /* | |
607 | * No buffers ready to be released, but check whether any | |
608 | * frames in the reorder buffer have timed out. | |
609 | */ | |
aa0c8636 CL |
610 | int skipped = 1; |
611 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
612 | j = (j + 1) % tid_agg_rx->buf_size) { | |
613 | if (!tid_agg_rx->reorder_buf[j]) { | |
614 | skipped++; | |
615 | continue; | |
616 | } | |
499fe9a4 DH |
617 | if (skipped && |
618 | !time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
aa0c8636 | 619 | HT_RX_REORDER_BUF_TIMEOUT)) |
2bff8ebf | 620 | goto set_release_timer; |
aa0c8636 CL |
621 | |
622 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
623 | if (net_ratelimit()) | |
0fb9a9ec JP |
624 | wiphy_debug(hw->wiphy, |
625 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
aa0c8636 | 626 | #endif |
24a8fdad | 627 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
aa0c8636 CL |
628 | |
629 | /* | |
630 | * Increment the head seq# also for the skipped slots. | |
631 | */ | |
632 | tid_agg_rx->head_seq_num = | |
633 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
634 | skipped = 0; | |
635 | } | |
636 | } else while (tid_agg_rx->reorder_buf[index]) { | |
24a8fdad | 637 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
aa0c8636 CL |
638 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
639 | tid_agg_rx->buf_size; | |
640 | } | |
2bff8ebf CL |
641 | |
642 | if (tid_agg_rx->stored_mpdu_num) { | |
643 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
644 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
645 | ||
646 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
647 | j = (j + 1) % tid_agg_rx->buf_size) { | |
648 | if (tid_agg_rx->reorder_buf[j]) | |
649 | break; | |
650 | } | |
651 | ||
652 | set_release_timer: | |
653 | ||
654 | mod_timer(&tid_agg_rx->reorder_timer, | |
334df731 | 655 | tid_agg_rx->reorder_time[j] + 1 + |
2bff8ebf CL |
656 | HT_RX_REORDER_BUF_TIMEOUT); |
657 | } else { | |
658 | del_timer(&tid_agg_rx->reorder_timer); | |
659 | } | |
aa0c8636 CL |
660 | } |
661 | ||
1edfb1af JB |
662 | /* |
663 | * As this function belongs to the RX path it must be under | |
664 | * rcu_read_lock protection. It returns false if the frame | |
665 | * can be processed immediately, true if it was consumed. | |
666 | */ | |
667 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
668 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 669 | struct sk_buff *skb) |
1edfb1af JB |
670 | { |
671 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
672 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
673 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
674 | u16 head_seq_num, buf_size; | |
675 | int index; | |
2bff8ebf | 676 | bool ret = true; |
1edfb1af | 677 | |
dd318575 JB |
678 | spin_lock(&tid_agg_rx->reorder_lock); |
679 | ||
1edfb1af JB |
680 | buf_size = tid_agg_rx->buf_size; |
681 | head_seq_num = tid_agg_rx->head_seq_num; | |
682 | ||
683 | /* frame with out of date sequence number */ | |
684 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
685 | dev_kfree_skb(skb); | |
2bff8ebf | 686 | goto out; |
1edfb1af JB |
687 | } |
688 | ||
689 | /* | |
690 | * If frame the sequence number exceeds our buffering window | |
691 | * size release some previous frames to make room for this one. | |
692 | */ | |
693 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
694 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
695 | /* release stored frames up to new head to stack */ | |
24a8fdad | 696 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); |
1edfb1af JB |
697 | } |
698 | ||
699 | /* Now the new frame is always in the range of the reordering buffer */ | |
700 | ||
701 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
702 | ||
703 | /* check if we already stored this frame */ | |
704 | if (tid_agg_rx->reorder_buf[index]) { | |
705 | dev_kfree_skb(skb); | |
2bff8ebf | 706 | goto out; |
1edfb1af JB |
707 | } |
708 | ||
709 | /* | |
710 | * If the current MPDU is in the right order and nothing else | |
711 | * is stored we can process it directly, no need to buffer it. | |
c835b214 JB |
712 | * If it is first but there's something stored, we may be able |
713 | * to release frames after this one. | |
1edfb1af JB |
714 | */ |
715 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
716 | tid_agg_rx->stored_mpdu_num == 0) { | |
717 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
718 | ret = false; |
719 | goto out; | |
1edfb1af JB |
720 | } |
721 | ||
722 | /* put the frame in the reordering buffer */ | |
723 | tid_agg_rx->reorder_buf[index] = skb; | |
724 | tid_agg_rx->reorder_time[index] = jiffies; | |
725 | tid_agg_rx->stored_mpdu_num++; | |
24a8fdad | 726 | ieee80211_sta_reorder_release(hw, tid_agg_rx); |
1edfb1af | 727 | |
2bff8ebf CL |
728 | out: |
729 | spin_unlock(&tid_agg_rx->reorder_lock); | |
730 | return ret; | |
1edfb1af JB |
731 | } |
732 | ||
733 | /* | |
734 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
735 | * true if the MPDU was buffered, false if it should be processed. | |
736 | */ | |
24a8fdad | 737 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) |
1edfb1af | 738 | { |
2569a826 JB |
739 | struct sk_buff *skb = rx->skb; |
740 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
741 | struct ieee80211_hw *hw = &local->hw; |
742 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 743 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
744 | struct tid_ampdu_rx *tid_agg_rx; |
745 | u16 sc; | |
746 | int tid; | |
747 | ||
748 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 749 | goto dont_reorder; |
1edfb1af JB |
750 | |
751 | /* | |
752 | * filter the QoS data rx stream according to | |
753 | * STA/TID and check if this STA/TID is on aggregation | |
754 | */ | |
755 | ||
1edfb1af | 756 | if (!sta) |
2569a826 | 757 | goto dont_reorder; |
1edfb1af JB |
758 | |
759 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
760 | ||
a87f736d JB |
761 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
762 | if (!tid_agg_rx) | |
763 | goto dont_reorder; | |
1edfb1af JB |
764 | |
765 | /* qos null data frames are excluded */ | |
766 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 767 | goto dont_reorder; |
1edfb1af JB |
768 | |
769 | /* new, potentially un-ordered, ampdu frame - process it */ | |
770 | ||
771 | /* reset session timer */ | |
772 | if (tid_agg_rx->timeout) | |
773 | mod_timer(&tid_agg_rx->session_timer, | |
774 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
775 | ||
776 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
777 | sc = le16_to_cpu(hdr->seq_ctrl); | |
778 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 779 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
780 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
781 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 782 | return; |
1edfb1af JB |
783 | } |
784 | ||
a87f736d JB |
785 | /* |
786 | * No locking needed -- we will only ever process one | |
787 | * RX packet at a time, and thus own tid_agg_rx. All | |
788 | * other code manipulating it needs to (and does) make | |
789 | * sure that we cannot get to it any more before doing | |
790 | * anything with it. | |
791 | */ | |
24a8fdad | 792 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) |
2569a826 JB |
793 | return; |
794 | ||
795 | dont_reorder: | |
24a8fdad | 796 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af | 797 | } |
33b64eb2 | 798 | |
49461622 | 799 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 800 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 801 | { |
a7767f95 | 802 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 803 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
804 | |
805 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
806 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 807 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 808 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 809 | hdr->seq_ctrl)) { |
554891e6 | 810 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
811 | rx->local->dot11FrameDuplicateCount++; |
812 | rx->sta->num_duplicates++; | |
813 | } | |
b1f93314 | 814 | return RX_DROP_UNUSABLE; |
571ecf67 | 815 | } else |
5cf121c3 | 816 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
817 | } |
818 | ||
571ecf67 JB |
819 | if (unlikely(rx->skb->len < 16)) { |
820 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 821 | return RX_DROP_MONITOR; |
571ecf67 JB |
822 | } |
823 | ||
571ecf67 JB |
824 | /* Drop disallowed frame classes based on STA auth/assoc state; |
825 | * IEEE 802.11, Chap 5.5. | |
826 | * | |
ccd7b362 JB |
827 | * mac80211 filters only based on association state, i.e. it drops |
828 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
829 | * deauth/disassoc frames when needed. In addition, hostapd is |
830 | * responsible for filtering on both auth and assoc states. | |
831 | */ | |
33b64eb2 | 832 | |
902acc78 | 833 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 834 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 835 | |
a7767f95 HH |
836 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
837 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 838 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
1be7fe8d | 839 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && |
0c2530ce | 840 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) |
e4c26add | 841 | return RX_DROP_MONITOR; |
571ecf67 | 842 | |
9ae54c84 | 843 | return RX_CONTINUE; |
570bd537 JB |
844 | } |
845 | ||
846 | ||
49461622 | 847 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 848 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 849 | { |
eb9fb5b8 JB |
850 | struct sk_buff *skb = rx->skb; |
851 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
852 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
853 | int keyidx; |
854 | int hdrlen; | |
e4c26add | 855 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
e31b8213 | 856 | struct ieee80211_key *sta_ptk = NULL; |
3cfcf6ac | 857 | int mmie_keyidx = -1; |
761ab470 | 858 | __le16 fc; |
570bd537 | 859 | |
3017b80b JB |
860 | /* |
861 | * Key selection 101 | |
862 | * | |
3cfcf6ac | 863 | * There are four types of keys: |
3017b80b | 864 | * - GTK (group keys) |
3cfcf6ac | 865 | * - IGTK (group keys for management frames) |
3017b80b JB |
866 | * - PTK (pairwise keys) |
867 | * - STK (station-to-station pairwise keys) | |
868 | * | |
869 | * When selecting a key, we have to distinguish between multicast | |
870 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
871 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
872 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
873 | * unicast frames can also use key indices like GTKs. Hence, if we | |
874 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 875 | * |
8dc06a1c JB |
876 | * Note that in a regular BSS, multicast frames are sent by the |
877 | * AP only, associated stations unicast the frame to the AP first | |
878 | * which then multicasts it on their behalf. | |
879 | * | |
3017b80b JB |
880 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
881 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
882 | * The spec seems to expect that one negotiates the same key with |
883 | * every station but there's no such requirement; VLANs could be | |
884 | * possible. | |
3017b80b JB |
885 | */ |
886 | ||
3017b80b | 887 | /* |
1990af8d | 888 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
889 | * addressed to us nor a multicast frame. |
890 | */ | |
554891e6 | 891 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 892 | return RX_CONTINUE; |
3017b80b | 893 | |
2569a826 JB |
894 | /* start without a key */ |
895 | rx->key = NULL; | |
896 | ||
d4e46a3d | 897 | if (rx->sta) |
e31b8213 | 898 | sta_ptk = rcu_dereference(rx->sta->ptk); |
d4e46a3d | 899 | |
761ab470 JB |
900 | fc = hdr->frame_control; |
901 | ||
902 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
903 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
904 | ||
e31b8213 JB |
905 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
906 | rx->key = sta_ptk; | |
dc1580dd JB |
907 | if ((status->flag & RX_FLAG_DECRYPTED) && |
908 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
909 | return RX_CONTINUE; | |
0c7c10c7 | 910 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 911 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 912 | return RX_CONTINUE; |
3cfcf6ac JM |
913 | } else if (mmie_keyidx >= 0) { |
914 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
915 | if ((status->flag & RX_FLAG_DECRYPTED) && |
916 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
917 | return RX_CONTINUE; |
918 | ||
919 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
920 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
921 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
e31b8213 JB |
922 | if (rx->sta) |
923 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
924 | if (!rx->key) | |
925 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 926 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
927 | /* |
928 | * The frame was not protected, so skip decryption. However, we | |
929 | * need to set rx->key if there is a key that could have been | |
930 | * used so that the frame may be dropped if encryption would | |
931 | * have been expected. | |
932 | */ | |
933 | struct ieee80211_key *key = NULL; | |
897bed8b JB |
934 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
935 | int i; | |
936 | ||
761ab470 | 937 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
938 | is_multicast_ether_addr(hdr->addr1) && |
939 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
940 | rx->key = key; | |
897bed8b JB |
941 | else { |
942 | if (rx->sta) { | |
943 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
944 | key = rcu_dereference(rx->sta->gtk[i]); | |
945 | if (key) | |
946 | break; | |
947 | } | |
948 | } | |
949 | if (!key) { | |
950 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
951 | key = rcu_dereference(sdata->keys[i]); | |
952 | if (key) | |
953 | break; | |
954 | } | |
955 | } | |
956 | if (key) | |
957 | rx->key = key; | |
958 | } | |
0c7c10c7 | 959 | return RX_CONTINUE; |
571ecf67 | 960 | } else { |
39184b15 | 961 | u8 keyid; |
3017b80b JB |
962 | /* |
963 | * The device doesn't give us the IV so we won't be | |
964 | * able to look up the key. That's ok though, we | |
965 | * don't need to decrypt the frame, we just won't | |
966 | * be able to keep statistics accurate. | |
967 | * Except for key threshold notifications, should | |
968 | * we somehow allow the driver to tell us which key | |
969 | * the hardware used if this flag is set? | |
970 | */ | |
eb9fb5b8 JB |
971 | if ((status->flag & RX_FLAG_DECRYPTED) && |
972 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 973 | return RX_CONTINUE; |
3017b80b | 974 | |
761ab470 | 975 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
976 | |
977 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 978 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
979 | |
980 | /* | |
981 | * no need to call ieee80211_wep_get_keyidx, | |
982 | * it verifies a bunch of things we've done already | |
983 | */ | |
39184b15 ZY |
984 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
985 | keyidx = keyid >> 6; | |
3017b80b | 986 | |
e31b8213 JB |
987 | /* check per-station GTK first, if multicast packet */ |
988 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
989 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
3017b80b | 990 | |
e31b8213 JB |
991 | /* if not found, try default key */ |
992 | if (!rx->key) { | |
993 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
994 | ||
995 | /* | |
996 | * RSNA-protected unicast frames should always be | |
997 | * sent with pairwise or station-to-station keys, | |
998 | * but for WEP we allow using a key index as well. | |
999 | */ | |
1000 | if (rx->key && | |
1001 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
1002 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1003 | !is_multicast_ether_addr(hdr->addr1)) | |
1004 | rx->key = NULL; | |
1005 | } | |
571ecf67 JB |
1006 | } |
1007 | ||
3017b80b | 1008 | if (rx->key) { |
571ecf67 | 1009 | rx->key->tx_rx_count++; |
011bfcc4 | 1010 | /* TODO: add threshold stuff again */ |
1990af8d | 1011 | } else { |
e4c26add | 1012 | return RX_DROP_MONITOR; |
70f08765 JB |
1013 | } |
1014 | ||
39184b15 ZY |
1015 | if (skb_linearize(rx->skb)) |
1016 | return RX_DROP_UNUSABLE; | |
761ab470 | 1017 | /* the hdr variable is invalid now! */ |
1990af8d | 1018 | |
97359d12 JB |
1019 | switch (rx->key->conf.cipher) { |
1020 | case WLAN_CIPHER_SUITE_WEP40: | |
1021 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
1022 | /* Check for weak IVs if possible */ |
1023 | if (rx->sta && ieee80211_is_data(fc) && | |
1024 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
1025 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1026 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
1027 | rx->sta->wep_weak_iv_count++; | |
1028 | ||
e2f036da MN |
1029 | result = ieee80211_crypto_wep_decrypt(rx); |
1030 | break; | |
97359d12 | 1031 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
1032 | result = ieee80211_crypto_tkip_decrypt(rx); |
1033 | break; | |
97359d12 | 1034 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1035 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1036 | break; | |
97359d12 | 1037 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1038 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1039 | break; | |
3ffc2a90 JB |
1040 | default: |
1041 | /* | |
1042 | * We can reach here only with HW-only algorithms | |
1043 | * but why didn't it decrypt the frame?! | |
1044 | */ | |
1045 | return RX_DROP_UNUSABLE; | |
70f08765 JB |
1046 | } |
1047 | ||
e2f036da | 1048 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1049 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1050 | |
1051 | return result; | |
70f08765 JB |
1052 | } |
1053 | ||
572e0012 KV |
1054 | static ieee80211_rx_result debug_noinline |
1055 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1056 | { | |
1057 | struct ieee80211_local *local; | |
1058 | struct ieee80211_hdr *hdr; | |
1059 | struct sk_buff *skb; | |
1060 | ||
1061 | local = rx->local; | |
1062 | skb = rx->skb; | |
1063 | hdr = (struct ieee80211_hdr *) skb->data; | |
1064 | ||
1065 | if (!local->pspolling) | |
1066 | return RX_CONTINUE; | |
1067 | ||
1068 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1069 | /* this is not from AP */ | |
1070 | return RX_CONTINUE; | |
1071 | ||
1072 | if (!ieee80211_is_data(hdr->frame_control)) | |
1073 | return RX_CONTINUE; | |
1074 | ||
1075 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1076 | /* AP has no more frames buffered for us */ | |
1077 | local->pspolling = false; | |
1078 | return RX_CONTINUE; | |
1079 | } | |
1080 | ||
1081 | /* more data bit is set, let's request a new frame from the AP */ | |
1082 | ieee80211_send_pspoll(local, rx->sdata); | |
1083 | ||
1084 | return RX_CONTINUE; | |
1085 | } | |
1086 | ||
133b8226 | 1087 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1088 | { |
133b8226 | 1089 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1090 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1091 | |
3e122be0 | 1092 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1093 | set_sta_flags(sta, WLAN_STA_PS_STA); |
d057e5a3 AN |
1094 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
1095 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 1096 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1097 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1098 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1099 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1100 | } | |
1101 | ||
ff9458d3 | 1102 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1103 | { |
133b8226 | 1104 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1105 | |
3e122be0 | 1106 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1107 | |
571ecf67 | 1108 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1109 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1110 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1111 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1112 | |
af818581 | 1113 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1114 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1115 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1116 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1117 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1118 | return; |
1119 | } | |
1120 | ||
1121 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1122 | } |
1123 | ||
d057e5a3 AN |
1124 | int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) |
1125 | { | |
1126 | struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); | |
1127 | bool in_ps; | |
1128 | ||
1129 | WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); | |
1130 | ||
1131 | /* Don't let the same PS state be set twice */ | |
1132 | in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA); | |
1133 | if ((start && in_ps) || (!start && !in_ps)) | |
1134 | return -EINVAL; | |
1135 | ||
1136 | if (start) | |
1137 | ap_sta_ps_start(sta_inf); | |
1138 | else | |
1139 | ap_sta_ps_end(sta_inf); | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | EXPORT_SYMBOL(ieee80211_sta_ps_transition); | |
1144 | ||
49461622 | 1145 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1146 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1147 | { |
1148 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1149 | struct sk_buff *skb = rx->skb; |
1150 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1151 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1152 | |
1153 | if (!sta) | |
9ae54c84 | 1154 | return RX_CONTINUE; |
571ecf67 | 1155 | |
b291ba11 JB |
1156 | /* |
1157 | * Update last_rx only for IBSS packets which are for the current | |
1158 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1159 | * where other STAs start using different BSSID. | |
1160 | */ | |
05c914fe | 1161 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1162 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1163 | NL80211_IFTYPE_ADHOC); |
3af6334c | 1164 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) { |
571ecf67 | 1165 | sta->last_rx = jiffies; |
3af6334c FF |
1166 | if (ieee80211_is_data(hdr->frame_control)) { |
1167 | sta->last_rx_rate_idx = status->rate_idx; | |
1168 | sta->last_rx_rate_flag = status->flag; | |
1169 | } | |
1170 | } | |
b291ba11 JB |
1171 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1172 | /* | |
33b64eb2 LCC |
1173 | * Mesh beacons will update last_rx when if they are found to |
1174 | * match the current local configuration when processed. | |
571ecf67 | 1175 | */ |
b291ba11 | 1176 | sta->last_rx = jiffies; |
3af6334c FF |
1177 | if (ieee80211_is_data(hdr->frame_control)) { |
1178 | sta->last_rx_rate_idx = status->rate_idx; | |
1179 | sta->last_rx_rate_flag = status->flag; | |
1180 | } | |
571ecf67 JB |
1181 | } |
1182 | ||
554891e6 | 1183 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1184 | return RX_CONTINUE; |
571ecf67 | 1185 | |
3cf335d5 KV |
1186 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1187 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1188 | ||
571ecf67 JB |
1189 | sta->rx_fragments++; |
1190 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1191 | sta->last_signal = status->signal; |
541a45a1 | 1192 | ewma_add(&sta->avg_signal, -status->signal); |
571ecf67 | 1193 | |
72eaa43a JB |
1194 | /* |
1195 | * Change STA power saving mode only at the end of a frame | |
1196 | * exchange sequence. | |
1197 | */ | |
d057e5a3 AN |
1198 | if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && |
1199 | !ieee80211_has_morefrags(hdr->frame_control) && | |
4cfda47b | 1200 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
05c914fe JB |
1201 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1202 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1203 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1204 | /* |
1205 | * Ignore doze->wake transitions that are | |
1206 | * indicated by non-data frames, the standard | |
1207 | * is unclear here, but for example going to | |
1208 | * PS mode and then scanning would cause a | |
1209 | * doze->wake transition for the probe request, | |
1210 | * and that is clearly undesirable. | |
1211 | */ | |
1212 | if (ieee80211_is_data(hdr->frame_control) && | |
1213 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1214 | ap_sta_ps_end(sta); |
72eaa43a JB |
1215 | } else { |
1216 | if (ieee80211_has_pm(hdr->frame_control)) | |
1217 | ap_sta_ps_start(sta); | |
1218 | } | |
571ecf67 JB |
1219 | } |
1220 | ||
22403def JB |
1221 | /* |
1222 | * Drop (qos-)data::nullfunc frames silently, since they | |
1223 | * are used only to control station power saving mode. | |
1224 | */ | |
1225 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1226 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1227 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1228 | |
1229 | /* | |
1230 | * If we receive a 4-addr nullfunc frame from a STA | |
1231 | * that was not moved to a 4-addr STA vlan yet, drop | |
1232 | * the frame to the monitor interface, to make sure | |
1233 | * that hostapd sees it | |
1234 | */ | |
1235 | if (ieee80211_has_a4(hdr->frame_control) && | |
1236 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1237 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1238 | !rx->sdata->u.vlan.sta))) | |
1239 | return RX_DROP_MONITOR; | |
22403def JB |
1240 | /* |
1241 | * Update counter and free packet here to avoid | |
1242 | * counting this as a dropped packed. | |
1243 | */ | |
571ecf67 JB |
1244 | sta->rx_packets++; |
1245 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1246 | return RX_QUEUED; |
571ecf67 JB |
1247 | } |
1248 | ||
9ae54c84 | 1249 | return RX_CONTINUE; |
571ecf67 JB |
1250 | } /* ieee80211_rx_h_sta_process */ |
1251 | ||
571ecf67 JB |
1252 | static inline struct ieee80211_fragment_entry * |
1253 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1254 | unsigned int frag, unsigned int seq, int rx_queue, | |
1255 | struct sk_buff **skb) | |
1256 | { | |
1257 | struct ieee80211_fragment_entry *entry; | |
1258 | int idx; | |
1259 | ||
1260 | idx = sdata->fragment_next; | |
1261 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1262 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1263 | sdata->fragment_next = 0; | |
1264 | ||
1265 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1266 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1267 | struct ieee80211_hdr *hdr = |
1268 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1269 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1270 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1271 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1272 | sdata->name, idx, |
571ecf67 | 1273 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1274 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1275 | #endif |
571ecf67 JB |
1276 | __skb_queue_purge(&entry->skb_list); |
1277 | } | |
1278 | ||
1279 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1280 | *skb = NULL; | |
1281 | entry->first_frag_time = jiffies; | |
1282 | entry->seq = seq; | |
1283 | entry->rx_queue = rx_queue; | |
1284 | entry->last_frag = frag; | |
1285 | entry->ccmp = 0; | |
1286 | entry->extra_len = 0; | |
1287 | ||
1288 | return entry; | |
1289 | } | |
1290 | ||
1291 | static inline struct ieee80211_fragment_entry * | |
1292 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1293 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1294 | int rx_queue, struct ieee80211_hdr *hdr) |
1295 | { | |
1296 | struct ieee80211_fragment_entry *entry; | |
1297 | int i, idx; | |
1298 | ||
1299 | idx = sdata->fragment_next; | |
1300 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1301 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1302 | |
1303 | idx--; | |
1304 | if (idx < 0) | |
1305 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1306 | ||
1307 | entry = &sdata->fragments[idx]; | |
1308 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1309 | entry->rx_queue != rx_queue || | |
1310 | entry->last_frag + 1 != frag) | |
1311 | continue; | |
1312 | ||
b73d70ad | 1313 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1314 | |
b73d70ad HH |
1315 | /* |
1316 | * Check ftype and addresses are equal, else check next fragment | |
1317 | */ | |
1318 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1319 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1320 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1321 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1322 | continue; | |
1323 | ||
ab46623e | 1324 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1325 | __skb_queue_purge(&entry->skb_list); |
1326 | continue; | |
1327 | } | |
1328 | return entry; | |
1329 | } | |
1330 | ||
1331 | return NULL; | |
1332 | } | |
1333 | ||
49461622 | 1334 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1335 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1336 | { |
1337 | struct ieee80211_hdr *hdr; | |
1338 | u16 sc; | |
358c8d9d | 1339 | __le16 fc; |
571ecf67 JB |
1340 | unsigned int frag, seq; |
1341 | struct ieee80211_fragment_entry *entry; | |
1342 | struct sk_buff *skb; | |
554891e6 | 1343 | struct ieee80211_rx_status *status; |
571ecf67 | 1344 | |
b73d70ad | 1345 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1346 | fc = hdr->frame_control; |
571ecf67 JB |
1347 | sc = le16_to_cpu(hdr->seq_ctrl); |
1348 | frag = sc & IEEE80211_SCTL_FRAG; | |
1349 | ||
358c8d9d | 1350 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1351 | (rx->skb)->len < 24 || |
1352 | is_multicast_ether_addr(hdr->addr1))) { | |
1353 | /* not fragmented */ | |
1354 | goto out; | |
1355 | } | |
1356 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1357 | ||
e3cf8b3f ZY |
1358 | if (skb_linearize(rx->skb)) |
1359 | return RX_DROP_UNUSABLE; | |
1360 | ||
058897a4 AK |
1361 | /* |
1362 | * skb_linearize() might change the skb->data and | |
1363 | * previously cached variables (in this case, hdr) need to | |
1364 | * be refreshed with the new data. | |
1365 | */ | |
1366 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1367 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1368 | ||
1369 | if (frag == 0) { | |
1370 | /* This is the first fragment of a new frame. */ | |
1371 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1372 | rx->queue, &(rx->skb)); |
97359d12 | 1373 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1374 | ieee80211_has_protected(fc)) { |
9190252c JM |
1375 | int queue = ieee80211_is_mgmt(fc) ? |
1376 | NUM_RX_DATA_QUEUES : rx->queue; | |
571ecf67 JB |
1377 | /* Store CCMP PN so that we can verify that the next |
1378 | * fragment has a sequential PN value. */ | |
1379 | entry->ccmp = 1; | |
1380 | memcpy(entry->last_pn, | |
9190252c | 1381 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1382 | CCMP_PN_LEN); |
1383 | } | |
9ae54c84 | 1384 | return RX_QUEUED; |
571ecf67 JB |
1385 | } |
1386 | ||
1387 | /* This is a fragment for a frame that should already be pending in | |
1388 | * fragment cache. Add this fragment to the end of the pending entry. | |
1389 | */ | |
b73d70ad | 1390 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1391 | if (!entry) { |
1392 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1393 | return RX_DROP_MONITOR; |
571ecf67 JB |
1394 | } |
1395 | ||
1396 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1397 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1398 | if (entry->ccmp) { | |
1399 | int i; | |
1400 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1401 | int queue; |
97359d12 | 1402 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1403 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1404 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1405 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1406 | pn[i]++; | |
1407 | if (pn[i]) | |
1408 | break; | |
1409 | } | |
9190252c JM |
1410 | queue = ieee80211_is_mgmt(fc) ? |
1411 | NUM_RX_DATA_QUEUES : rx->queue; | |
1412 | rpn = rx->key->u.ccmp.rx_pn[queue]; | |
f4ea83dd | 1413 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1414 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1415 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1416 | } | |
1417 | ||
358c8d9d | 1418 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1419 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1420 | entry->last_frag = frag; | |
1421 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1422 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1423 | rx->skb = NULL; |
9ae54c84 | 1424 | return RX_QUEUED; |
571ecf67 JB |
1425 | } |
1426 | ||
1427 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1428 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1429 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1430 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1431 | GFP_ATOMIC))) { | |
1432 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1433 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1434 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1435 | } |
1436 | } | |
1437 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1438 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1439 | dev_kfree_skb(skb); | |
1440 | } | |
1441 | ||
1442 | /* Complete frame has been reassembled - process it now */ | |
554891e6 JB |
1443 | status = IEEE80211_SKB_RXCB(rx->skb); |
1444 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
571ecf67 JB |
1445 | |
1446 | out: | |
1447 | if (rx->sta) | |
1448 | rx->sta->rx_packets++; | |
1449 | if (is_multicast_ether_addr(hdr->addr1)) | |
1450 | rx->local->dot11MulticastReceivedFrameCount++; | |
1451 | else | |
1452 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1453 | return RX_CONTINUE; |
571ecf67 JB |
1454 | } |
1455 | ||
49461622 | 1456 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1457 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1458 | { |
af818581 | 1459 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1460 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
554891e6 | 1461 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1462 | |
358c8d9d | 1463 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
554891e6 | 1464 | !(status->rx_flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1465 | return RX_CONTINUE; |
571ecf67 | 1466 | |
05c914fe JB |
1467 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1468 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1469 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1470 | |
af818581 JB |
1471 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1472 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1473 | else | |
1474 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1475 | |
9ae54c84 | 1476 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1477 | * count as an dropped frame. */ |
1478 | dev_kfree_skb(rx->skb); | |
1479 | ||
9ae54c84 | 1480 | return RX_QUEUED; |
571ecf67 JB |
1481 | } |
1482 | ||
49461622 | 1483 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1484 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1485 | { |
6e0d114d | 1486 | u8 *data = rx->skb->data; |
238f74a2 | 1487 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1488 | |
238f74a2 | 1489 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1490 | return RX_CONTINUE; |
6e0d114d JB |
1491 | |
1492 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1493 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1494 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1495 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1496 | /* change frame type to non QOS */ |
238f74a2 | 1497 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1498 | |
9ae54c84 | 1499 | return RX_CONTINUE; |
6e0d114d JB |
1500 | } |
1501 | ||
76ee65bf | 1502 | static int |
5cf121c3 | 1503 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1504 | { |
07346f81 | 1505 | if (unlikely(!rx->sta || |
f4ea83dd | 1506 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1507 | return -EACCES; |
571ecf67 | 1508 | |
76ee65bf | 1509 | return 0; |
571ecf67 JB |
1510 | } |
1511 | ||
76ee65bf | 1512 | static int |
358c8d9d | 1513 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1514 | { |
eb9fb5b8 JB |
1515 | struct sk_buff *skb = rx->skb; |
1516 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1517 | ||
3017b80b | 1518 | /* |
7848ba7d JB |
1519 | * Pass through unencrypted frames if the hardware has |
1520 | * decrypted them already. | |
3017b80b | 1521 | */ |
eb9fb5b8 | 1522 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1523 | return 0; |
571ecf67 JB |
1524 | |
1525 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1526 | if (unlikely(!ieee80211_has_protected(fc) && |
1527 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1528 | ieee80211_is_data(fc) && |
b3fc9c6c | 1529 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1530 | return -EACCES; |
bef5d1c7 JB |
1531 | |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | static int | |
1536 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1537 | { | |
1538 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1539 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1540 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1541 | |
e3efca0a JM |
1542 | /* |
1543 | * Pass through unencrypted frames if the hardware has | |
1544 | * decrypted them already. | |
1545 | */ | |
1546 | if (status->flag & RX_FLAG_DECRYPTED) | |
1547 | return 0; | |
bef5d1c7 | 1548 | |
f2ca3ea4 | 1549 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1550 | if (unlikely(!ieee80211_has_protected(fc) && |
1551 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
cf4e594e JM |
1552 | rx->key)) { |
1553 | if (ieee80211_is_deauth(fc)) | |
1554 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1555 | rx->skb->data, | |
1556 | rx->skb->len); | |
1557 | else if (ieee80211_is_disassoc(fc)) | |
1558 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1559 | rx->skb->data, | |
1560 | rx->skb->len); | |
f2ca3ea4 | 1561 | return -EACCES; |
cf4e594e | 1562 | } |
f2ca3ea4 | 1563 | /* BIP does not use Protected field, so need to check MMIE */ |
f64f9e71 | 1564 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
cf4e594e JM |
1565 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
1566 | if (ieee80211_is_deauth(fc)) | |
1567 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1568 | rx->skb->data, | |
1569 | rx->skb->len); | |
1570 | else if (ieee80211_is_disassoc(fc)) | |
1571 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1572 | rx->skb->data, | |
1573 | rx->skb->len); | |
f2ca3ea4 | 1574 | return -EACCES; |
cf4e594e | 1575 | } |
f2ca3ea4 JM |
1576 | /* |
1577 | * When using MFP, Action frames are not allowed prior to | |
1578 | * having configured keys. | |
1579 | */ | |
1580 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1581 | ieee80211_is_robust_mgmt_frame( | |
1582 | (struct ieee80211_hdr *) rx->skb->data))) | |
1583 | return -EACCES; | |
1584 | } | |
b3fc9c6c | 1585 | |
76ee65bf | 1586 | return 0; |
571ecf67 JB |
1587 | } |
1588 | ||
76ee65bf | 1589 | static int |
4114fa21 | 1590 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) |
571ecf67 | 1591 | { |
eb9fb5b8 | 1592 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee | 1593 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
fbb327c5 FF |
1594 | bool check_port_control = false; |
1595 | struct ethhdr *ehdr; | |
1596 | int ret; | |
f14543ee | 1597 | |
4114fa21 | 1598 | *port_control = false; |
9bc383de JB |
1599 | if (ieee80211_has_a4(hdr->frame_control) && |
1600 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1601 | return -1; |
9bc383de | 1602 | |
fbb327c5 FF |
1603 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
1604 | !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { | |
1605 | ||
1606 | if (!sdata->u.mgd.use_4addr) | |
1607 | return -1; | |
1608 | else | |
1609 | check_port_control = true; | |
1610 | } | |
1611 | ||
9bc383de | 1612 | if (is_multicast_ether_addr(hdr->addr1) && |
fbb327c5 | 1613 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) |
f14543ee | 1614 | return -1; |
571ecf67 | 1615 | |
fbb327c5 | 1616 | ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
4114fa21 | 1617 | if (ret < 0) |
fbb327c5 FF |
1618 | return ret; |
1619 | ||
1620 | ehdr = (struct ethhdr *) rx->skb->data; | |
4114fa21 FF |
1621 | if (ehdr->h_proto == rx->sdata->control_port_protocol) |
1622 | *port_control = true; | |
1623 | else if (check_port_control) | |
fbb327c5 FF |
1624 | return -1; |
1625 | ||
1626 | return 0; | |
76ee65bf | 1627 | } |
571ecf67 | 1628 | |
ce3edf6d JB |
1629 | /* |
1630 | * requires that rx->skb is a frame with ethernet header | |
1631 | */ | |
358c8d9d | 1632 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1633 | { |
c97c23e3 | 1634 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1635 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1636 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1637 | ||
1638 | /* | |
1639 | * Allow EAPOL frames to us/the PAE group address regardless | |
1640 | * of whether the frame was encrypted or not. | |
1641 | */ | |
a621fa4d | 1642 | if (ehdr->h_proto == rx->sdata->control_port_protocol && |
47846c9b | 1643 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1644 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1645 | return true; | |
1646 | ||
1647 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1648 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1649 | return false; |
1650 | ||
1651 | return true; | |
1652 | } | |
1653 | ||
1654 | /* | |
1655 | * requires that rx->skb is a frame with ethernet header | |
1656 | */ | |
76ee65bf | 1657 | static void |
5cf121c3 | 1658 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1659 | { |
eb9fb5b8 JB |
1660 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1661 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1662 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1663 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1664 | struct sta_info *dsta; | |
554891e6 | 1665 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1666 | |
76ee65bf RR |
1667 | skb = rx->skb; |
1668 | xmit_skb = NULL; | |
571ecf67 | 1669 | |
05c914fe JB |
1670 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1671 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1672 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
554891e6 | 1673 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
9bc383de | 1674 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
ce3edf6d JB |
1675 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1676 | /* | |
1677 | * send multicast frames both to higher layers in | |
1678 | * local net stack and back to the wireless medium | |
1679 | */ | |
76ee65bf RR |
1680 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1681 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1682 | printk(KERN_DEBUG "%s: failed to clone " |
1683 | "multicast frame\n", dev->name); | |
1684 | } else { | |
abe60632 JB |
1685 | dsta = sta_info_get(sdata, skb->data); |
1686 | if (dsta) { | |
ce3edf6d JB |
1687 | /* |
1688 | * The destination station is associated to | |
1689 | * this AP (in this VLAN), so send the frame | |
1690 | * directly to it and do not pass it to local | |
1691 | * net stack. | |
571ecf67 | 1692 | */ |
76ee65bf | 1693 | xmit_skb = skb; |
571ecf67 JB |
1694 | skb = NULL; |
1695 | } | |
571ecf67 JB |
1696 | } |
1697 | } | |
1698 | ||
1699 | if (skb) { | |
d1c3a37c JB |
1700 | int align __maybe_unused; |
1701 | ||
59d9cb07 | 1702 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1703 | /* |
1704 | * 'align' will only take the values 0 or 2 here | |
1705 | * since all frames are required to be aligned | |
1706 | * to 2-byte boundaries when being passed to | |
1707 | * mac80211. That also explains the __skb_push() | |
1708 | * below. | |
1709 | */ | |
dacb6f1d | 1710 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1711 | if (align) { |
1712 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1713 | dev_kfree_skb(skb); | |
1714 | skb = NULL; | |
1715 | } else { | |
1716 | u8 *data = skb->data; | |
8ce0b589 ZY |
1717 | size_t len = skb_headlen(skb); |
1718 | skb->data -= align; | |
1719 | memmove(skb->data, data, len); | |
1720 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1721 | } |
1722 | } | |
1723 | #endif | |
1724 | ||
1725 | if (skb) { | |
1726 | /* deliver to local stack */ | |
1727 | skb->protocol = eth_type_trans(skb, dev); | |
1728 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1729 | netif_receive_skb(skb); |
d1c3a37c | 1730 | } |
571ecf67 JB |
1731 | } |
1732 | ||
76ee65bf | 1733 | if (xmit_skb) { |
571ecf67 | 1734 | /* send to wireless media */ |
f831e909 | 1735 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1736 | skb_reset_network_header(xmit_skb); |
1737 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1738 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1739 | } |
76ee65bf RR |
1740 | } |
1741 | ||
49461622 | 1742 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1743 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1744 | { |
eb9fb5b8 | 1745 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1746 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1747 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1748 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1749 | struct sk_buff_head frame_list; |
554891e6 | 1750 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
fd4c7f2f | 1751 | |
358c8d9d | 1752 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1753 | return RX_CONTINUE; |
fd4c7f2f | 1754 | |
358c8d9d | 1755 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1756 | return RX_DROP_MONITOR; |
fd4c7f2f | 1757 | |
554891e6 | 1758 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1759 | return RX_CONTINUE; |
fd4c7f2f | 1760 | |
eaf85ca7 ZY |
1761 | if (ieee80211_has_a4(hdr->frame_control) && |
1762 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1763 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1764 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1765 | |
eaf85ca7 ZY |
1766 | if (is_multicast_ether_addr(hdr->addr1) && |
1767 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1768 | rx->sdata->u.vlan.sta) || | |
1769 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1770 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1771 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1772 | |
eaf85ca7 ZY |
1773 | skb->dev = dev; |
1774 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1775 | |
e3cf8b3f ZY |
1776 | if (skb_linearize(skb)) |
1777 | return RX_DROP_UNUSABLE; | |
1778 | ||
eaf85ca7 ZY |
1779 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1780 | rx->sdata->vif.type, | |
1781 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1782 | |
eaf85ca7 ZY |
1783 | while (!skb_queue_empty(&frame_list)) { |
1784 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1785 | |
358c8d9d | 1786 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1787 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1788 | continue; |
1789 | } | |
eaf85ca7 ZY |
1790 | dev->stats.rx_packets++; |
1791 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1792 | |
1793 | ieee80211_deliver_skb(rx); | |
1794 | } | |
1795 | ||
9ae54c84 | 1796 | return RX_QUEUED; |
fd4c7f2f RR |
1797 | } |
1798 | ||
bf94e17b | 1799 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1800 | static ieee80211_rx_result |
e32f85f7 LCC |
1801 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1802 | { | |
1803 | struct ieee80211_hdr *hdr; | |
1804 | struct ieee80211s_hdr *mesh_hdr; | |
1805 | unsigned int hdrlen; | |
1806 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1807 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1808 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
554891e6 | 1809 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
e32f85f7 LCC |
1810 | |
1811 | hdr = (struct ieee80211_hdr *) skb->data; | |
1812 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1813 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1814 | ||
1815 | if (!ieee80211_is_data(hdr->frame_control)) | |
1816 | return RX_CONTINUE; | |
1817 | ||
1818 | if (!mesh_hdr->ttl) | |
1819 | /* illegal frame */ | |
1820 | return RX_DROP_MONITOR; | |
1821 | ||
43b7b314 | 1822 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1823 | struct mesh_path *mppath; |
43b7b314 JC |
1824 | char *proxied_addr; |
1825 | char *mpp_addr; | |
1826 | ||
1827 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1828 | mpp_addr = hdr->addr3; | |
1829 | proxied_addr = mesh_hdr->eaddr1; | |
1830 | } else { | |
1831 | mpp_addr = hdr->addr4; | |
1832 | proxied_addr = mesh_hdr->eaddr2; | |
1833 | } | |
79617dee | 1834 | |
79617dee | 1835 | rcu_read_lock(); |
43b7b314 | 1836 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1837 | if (!mppath) { |
43b7b314 | 1838 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1839 | } else { |
1840 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1841 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1842 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1843 | spin_unlock_bh(&mppath->state_lock); |
1844 | } | |
1845 | rcu_read_unlock(); | |
1846 | } | |
1847 | ||
3c5772a5 JC |
1848 | /* Frame has reached destination. Don't forward */ |
1849 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1850 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1851 | return RX_CONTINUE; |
1852 | ||
1853 | mesh_hdr->ttl--; | |
1854 | ||
554891e6 | 1855 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
e32f85f7 | 1856 | if (!mesh_hdr->ttl) |
472dbc45 | 1857 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1858 | dropped_frames_ttl); |
1859 | else { | |
1860 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1861 | struct ieee80211_tx_info *info; |
1862 | ||
e32f85f7 LCC |
1863 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1864 | ||
1865 | if (!fwd_skb && net_ratelimit()) | |
1866 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1867 | sdata->name); |
919bbad5 | 1868 | if (!fwd_skb) |
b51aff05 | 1869 | goto out; |
e32f85f7 LCC |
1870 | |
1871 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1872 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1873 | info = IEEE80211_SKB_CB(fwd_skb); |
1874 | memset(info, 0, sizeof(*info)); | |
1875 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1876 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1877 | skb_set_queue_mapping(skb, |
1878 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1879 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1880 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1881 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1882 | fwded_mcast); | |
1883 | else { | |
3c5772a5 JC |
1884 | int err; |
1885 | /* | |
1886 | * Save TA to addr1 to send TA a path error if a | |
1887 | * suitable next hop is not found | |
1888 | */ | |
1889 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1890 | ETH_ALEN); |
3c5772a5 | 1891 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1892 | /* Failed to immediately resolve next hop: |
1893 | * fwded frame was dropped or will be added | |
1894 | * later to the pending skb queue. */ | |
1895 | if (err) | |
1896 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1897 | |
1898 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1899 | fwded_unicast); | |
249b405c JC |
1900 | } |
1901 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1902 | fwded_frames); | |
3b8d81e0 | 1903 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1904 | } |
1905 | } | |
1906 | ||
b51aff05 | 1907 | out: |
3c5772a5 | 1908 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1909 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1910 | return RX_CONTINUE; |
1911 | else | |
1912 | return RX_DROP_MONITOR; | |
1913 | } | |
bf94e17b | 1914 | #endif |
e32f85f7 | 1915 | |
49461622 | 1916 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1917 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1918 | { |
eb9fb5b8 | 1919 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1920 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1921 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1922 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1923 | __le16 fc = hdr->frame_control; | |
4114fa21 | 1924 | bool port_control; |
ce3edf6d | 1925 | int err; |
76ee65bf | 1926 | |
358c8d9d | 1927 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1928 | return RX_CONTINUE; |
76ee65bf | 1929 | |
358c8d9d | 1930 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1931 | return RX_DROP_MONITOR; |
76ee65bf | 1932 | |
f14543ee FF |
1933 | /* |
1934 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1935 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1936 | */ | |
1937 | if (ieee80211_has_a4(hdr->frame_control) && | |
1938 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1939 | return RX_DROP_MONITOR; | |
1940 | ||
4114fa21 | 1941 | err = __ieee80211_data_to_8023(rx, &port_control); |
76ee65bf | 1942 | if (unlikely(err)) |
e4c26add | 1943 | return RX_DROP_UNUSABLE; |
76ee65bf | 1944 | |
358c8d9d | 1945 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1946 | return RX_DROP_MONITOR; |
ce3edf6d | 1947 | |
4114fa21 FF |
1948 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
1949 | unlikely(port_control) && sdata->bss) { | |
1950 | sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, | |
1951 | u.ap); | |
1952 | dev = sdata->dev; | |
1953 | rx->sdata = sdata; | |
1954 | } | |
1955 | ||
76ee65bf RR |
1956 | rx->skb->dev = dev; |
1957 | ||
1958 | dev->stats.rx_packets++; | |
1959 | dev->stats.rx_bytes += rx->skb->len; | |
1960 | ||
08ca944e | 1961 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
8c99f691 RM |
1962 | !is_multicast_ether_addr( |
1963 | ((struct ethhdr *)rx->skb->data)->h_dest) && | |
1964 | (!local->scanning && | |
1965 | !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { | |
e15276a4 VN |
1966 | mod_timer(&local->dynamic_ps_timer, jiffies + |
1967 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1968 | } | |
1969 | ||
76ee65bf | 1970 | ieee80211_deliver_skb(rx); |
571ecf67 | 1971 | |
9ae54c84 | 1972 | return RX_QUEUED; |
571ecf67 JB |
1973 | } |
1974 | ||
49461622 | 1975 | static ieee80211_rx_result debug_noinline |
24a8fdad | 1976 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1977 | { |
1978 | struct ieee80211_local *local = rx->local; | |
1979 | struct ieee80211_hw *hw = &local->hw; | |
1980 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1981 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1982 | struct tid_ampdu_rx *tid_agg_rx; |
1983 | u16 start_seq_num; | |
1984 | u16 tid; | |
1985 | ||
a7767f95 | 1986 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1987 | return RX_CONTINUE; |
71364716 | 1988 | |
a7767f95 | 1989 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
1990 | struct { |
1991 | __le16 control, start_seq_num; | |
1992 | } __packed bar_data; | |
1993 | ||
71364716 | 1994 | if (!rx->sta) |
a02ae758 | 1995 | return RX_DROP_MONITOR; |
8ae5977f JB |
1996 | |
1997 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
1998 | &bar_data, sizeof(bar_data))) | |
1999 | return RX_DROP_MONITOR; | |
2000 | ||
8ae5977f | 2001 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
2002 | |
2003 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
2004 | if (!tid_agg_rx) | |
a02ae758 | 2005 | return RX_DROP_MONITOR; |
71364716 | 2006 | |
8ae5977f | 2007 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
2008 | |
2009 | /* reset session timer */ | |
20ad19d0 JB |
2010 | if (tid_agg_rx->timeout) |
2011 | mod_timer(&tid_agg_rx->session_timer, | |
2012 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 2013 | |
dd318575 | 2014 | spin_lock(&tid_agg_rx->reorder_lock); |
a02ae758 | 2015 | /* release stored frames up to start of BAR */ |
24a8fdad | 2016 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); |
dd318575 JB |
2017 | spin_unlock(&tid_agg_rx->reorder_lock); |
2018 | ||
a02ae758 JB |
2019 | kfree_skb(skb); |
2020 | return RX_QUEUED; | |
71364716 RR |
2021 | } |
2022 | ||
08daecae JB |
2023 | /* |
2024 | * After this point, we only want management frames, | |
2025 | * so we can drop all remaining control frames to | |
2026 | * cooked monitor interfaces. | |
2027 | */ | |
2028 | return RX_DROP_MONITOR; | |
71364716 RR |
2029 | } |
2030 | ||
f4f727a6 JM |
2031 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
2032 | struct ieee80211_mgmt *mgmt, | |
2033 | size_t len) | |
fea14732 JM |
2034 | { |
2035 | struct ieee80211_local *local = sdata->local; | |
2036 | struct sk_buff *skb; | |
2037 | struct ieee80211_mgmt *resp; | |
2038 | ||
47846c9b | 2039 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
2040 | /* Not to own unicast address */ |
2041 | return; | |
2042 | } | |
2043 | ||
46900298 JB |
2044 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
2045 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 2046 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
2047 | return; |
2048 | } | |
2049 | ||
2050 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2051 | /* Too short SA Query request frame */ | |
2052 | return; | |
2053 | } | |
2054 | ||
2055 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2056 | if (skb == NULL) | |
2057 | return; | |
2058 | ||
2059 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2060 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2061 | memset(resp, 0, 24); | |
2062 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 2063 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 2064 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
2065 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2066 | IEEE80211_STYPE_ACTION); | |
2067 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2068 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2069 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2070 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2071 | mgmt->u.action.u.sa_query.trans_id, | |
2072 | WLAN_SA_QUERY_TR_ID_LEN); | |
2073 | ||
62ae67be | 2074 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
2075 | } |
2076 | ||
2e161f78 JB |
2077 | static ieee80211_rx_result debug_noinline |
2078 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2079 | { | |
2080 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
554891e6 | 2081 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2082 | |
2083 | /* | |
2084 | * From here on, look only at management frames. | |
2085 | * Data and control frames are already handled, | |
2086 | * and unknown (reserved) frames are useless. | |
2087 | */ | |
2088 | if (rx->skb->len < 24) | |
2089 | return RX_DROP_MONITOR; | |
2090 | ||
2091 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2092 | return RX_DROP_MONITOR; | |
2093 | ||
554891e6 | 2094 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
2e161f78 JB |
2095 | return RX_DROP_MONITOR; |
2096 | ||
2097 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2098 | return RX_DROP_UNUSABLE; | |
2099 | ||
2100 | return RX_CONTINUE; | |
2101 | } | |
2102 | ||
de1ede7a JB |
2103 | static ieee80211_rx_result debug_noinline |
2104 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2105 | { | |
2106 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 2107 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 2108 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
554891e6 | 2109 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
de1ede7a JB |
2110 | int len = rx->skb->len; |
2111 | ||
2112 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2113 | return RX_CONTINUE; | |
2114 | ||
026331c4 JM |
2115 | /* drop too small frames */ |
2116 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 2117 | return RX_DROP_UNUSABLE; |
de1ede7a | 2118 | |
026331c4 | 2119 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 2120 | return RX_DROP_UNUSABLE; |
de1ede7a | 2121 | |
554891e6 | 2122 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 2123 | return RX_DROP_UNUSABLE; |
97ebe12a | 2124 | |
de1ede7a JB |
2125 | switch (mgmt->u.action.category) { |
2126 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
2127 | /* |
2128 | * The aggregation code is not prepared to handle | |
2129 | * anything but STA/AP due to the BSSID handling; | |
2130 | * IBSS could work in the code but isn't supported | |
2131 | * by drivers or the standard. | |
2132 | */ | |
2133 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2134 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2135 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 2136 | break; |
8abd3f9b | 2137 | |
026331c4 JM |
2138 | /* verify action_code is present */ |
2139 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2140 | break; | |
2141 | ||
de1ede7a JB |
2142 | switch (mgmt->u.action.u.addba_req.action_code) { |
2143 | case WLAN_ACTION_ADDBA_REQ: | |
2144 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2145 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
2146 | goto invalid; |
2147 | break; | |
de1ede7a JB |
2148 | case WLAN_ACTION_ADDBA_RESP: |
2149 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2150 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
2151 | goto invalid; |
2152 | break; | |
de1ede7a JB |
2153 | case WLAN_ACTION_DELBA: |
2154 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2155 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
2156 | goto invalid; |
2157 | break; | |
2158 | default: | |
2159 | goto invalid; | |
de1ede7a | 2160 | } |
bed7ee6e | 2161 | |
8b58ff83 | 2162 | goto queue; |
39192c0b JB |
2163 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2164 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2165 | break; |
46900298 JB |
2166 | |
2167 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2168 | break; |
46900298 | 2169 | |
026331c4 JM |
2170 | /* verify action_code is present */ |
2171 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2172 | break; | |
2173 | ||
39192c0b JB |
2174 | switch (mgmt->u.action.u.measurement.action_code) { |
2175 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2176 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2177 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2178 | break; |
39192c0b | 2179 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2180 | goto handled; |
c481ec97 S |
2181 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2182 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2183 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2184 | break; |
c481ec97 | 2185 | |
cc32abd4 | 2186 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2187 | break; |
cc32abd4 | 2188 | |
46900298 | 2189 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2190 | break; |
c481ec97 | 2191 | |
8b58ff83 | 2192 | goto queue; |
39192c0b JB |
2193 | } |
2194 | break; | |
fea14732 JM |
2195 | case WLAN_CATEGORY_SA_QUERY: |
2196 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2197 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2198 | break; |
2199 | ||
fea14732 JM |
2200 | switch (mgmt->u.action.u.sa_query.action) { |
2201 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2202 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2203 | break; |
fea14732 | 2204 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2205 | goto handled; |
fea14732 JM |
2206 | } |
2207 | break; | |
97ad9139 | 2208 | case WLAN_CATEGORY_MESH_PLINK: |
77a121c3 JB |
2209 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2210 | break; | |
8b58ff83 | 2211 | goto queue; |
c7108a71 JC |
2212 | case WLAN_CATEGORY_MESH_PATH_SEL: |
2213 | if (!mesh_path_sel_is_hwmp(sdata)) | |
2214 | break; | |
2215 | goto queue; | |
84040805 | 2216 | } |
026331c4 | 2217 | |
2e161f78 JB |
2218 | return RX_CONTINUE; |
2219 | ||
bed7ee6e | 2220 | invalid: |
554891e6 | 2221 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
2e161f78 JB |
2222 | /* will return in the next handlers */ |
2223 | return RX_CONTINUE; | |
2224 | ||
2225 | handled: | |
2226 | if (rx->sta) | |
2227 | rx->sta->rx_packets++; | |
2228 | dev_kfree_skb(rx->skb); | |
2229 | return RX_QUEUED; | |
2230 | ||
2231 | queue: | |
2232 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2233 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2234 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2235 | if (rx->sta) | |
2236 | rx->sta->rx_packets++; | |
2237 | return RX_QUEUED; | |
2238 | } | |
2239 | ||
2240 | static ieee80211_rx_result debug_noinline | |
2241 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2242 | { | |
554891e6 | 2243 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2244 | |
2245 | /* skip known-bad action frames and return them in the next handler */ | |
554891e6 | 2246 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
2e161f78 | 2247 | return RX_CONTINUE; |
d7907448 | 2248 | |
026331c4 JM |
2249 | /* |
2250 | * Getting here means the kernel doesn't know how to handle | |
2251 | * it, but maybe userspace does ... include returned frames | |
2252 | * so userspace can register for those to know whether ones | |
2253 | * it transmitted were processed or returned. | |
2254 | */ | |
026331c4 | 2255 | |
2e161f78 JB |
2256 | if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, |
2257 | rx->skb->data, rx->skb->len, | |
2258 | GFP_ATOMIC)) { | |
2259 | if (rx->sta) | |
2260 | rx->sta->rx_packets++; | |
2261 | dev_kfree_skb(rx->skb); | |
2262 | return RX_QUEUED; | |
2263 | } | |
2264 | ||
2265 | ||
2266 | return RX_CONTINUE; | |
2267 | } | |
2268 | ||
2269 | static ieee80211_rx_result debug_noinline | |
2270 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2271 | { | |
2272 | struct ieee80211_local *local = rx->local; | |
2273 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2274 | struct sk_buff *nskb; | |
2275 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
554891e6 | 2276 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2277 | |
2278 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2279 | return RX_CONTINUE; | |
2280 | ||
2281 | /* | |
2282 | * For AP mode, hostapd is responsible for handling any action | |
2283 | * frames that we didn't handle, including returning unknown | |
2284 | * ones. For all other modes we will return them to the sender, | |
2285 | * setting the 0x80 bit in the action category, as required by | |
2286 | * 802.11-2007 7.3.1.11. | |
2287 | * Newer versions of hostapd shall also use the management frame | |
2288 | * registration mechanisms, but older ones still use cooked | |
2289 | * monitor interfaces so push all frames there. | |
2290 | */ | |
554891e6 | 2291 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
2e161f78 JB |
2292 | (sdata->vif.type == NL80211_IFTYPE_AP || |
2293 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2294 | return RX_DROP_MONITOR; | |
026331c4 | 2295 | |
84040805 JB |
2296 | /* do not return rejected action frames */ |
2297 | if (mgmt->u.action.category & 0x80) | |
2298 | return RX_DROP_UNUSABLE; | |
2299 | ||
2300 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2301 | GFP_ATOMIC); | |
2302 | if (nskb) { | |
292b4df6 | 2303 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2304 | |
292b4df6 JL |
2305 | nmgmt->u.action.category |= 0x80; |
2306 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2307 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2308 | |
2309 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2310 | ||
2311 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a | 2312 | } |
39192c0b JB |
2313 | dev_kfree_skb(rx->skb); |
2314 | return RX_QUEUED; | |
de1ede7a JB |
2315 | } |
2316 | ||
49461622 | 2317 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2318 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2319 | { |
eb9fb5b8 | 2320 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2321 | ieee80211_rx_result rxs; |
77a121c3 JB |
2322 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2323 | __le16 stype; | |
571ecf67 | 2324 | |
af6b6374 JB |
2325 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2326 | if (rxs != RX_CONTINUE) | |
2327 | return rxs; | |
2328 | ||
77a121c3 | 2329 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2330 | |
77a121c3 JB |
2331 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2332 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2333 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2334 | return RX_DROP_MONITOR; | |
472dbc45 | 2335 | |
77a121c3 JB |
2336 | switch (stype) { |
2337 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2338 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2339 | /* process for all: mesh, mlme, ibss */ | |
2340 | break; | |
2341 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2342 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2c31333a CL |
2343 | if (is_multicast_ether_addr(mgmt->da) && |
2344 | !is_broadcast_ether_addr(mgmt->da)) | |
2345 | return RX_DROP_MONITOR; | |
2346 | ||
77a121c3 JB |
2347 | /* process only for station */ |
2348 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2349 | return RX_DROP_MONITOR; | |
2350 | break; | |
2351 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2352 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2353 | /* process only for ibss */ | |
2354 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2355 | return RX_DROP_MONITOR; | |
2356 | break; | |
2357 | default: | |
2358 | return RX_DROP_MONITOR; | |
2359 | } | |
f9d540ee | 2360 | |
77a121c3 | 2361 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2362 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2363 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2364 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2365 | if (rx->sta) |
2366 | rx->sta->rx_packets++; | |
46900298 | 2367 | |
77a121c3 | 2368 | return RX_QUEUED; |
571ecf67 JB |
2369 | } |
2370 | ||
5cf121c3 | 2371 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2372 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2373 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2374 | { |
2375 | struct ieee80211_sub_if_data *sdata; | |
2376 | struct ieee80211_local *local = rx->local; | |
2377 | struct ieee80211_rtap_hdr { | |
2378 | struct ieee80211_radiotap_header hdr; | |
2379 | u8 flags; | |
5f0b7de5 | 2380 | u8 rate_or_pad; |
3d30d949 MW |
2381 | __le16 chan_freq; |
2382 | __le16 chan_flags; | |
bc10502d | 2383 | } __packed *rthdr; |
3d30d949 MW |
2384 | struct sk_buff *skb = rx->skb, *skb2; |
2385 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2386 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2387 | |
554891e6 JB |
2388 | /* |
2389 | * If cooked monitor has been processed already, then | |
2390 | * don't do it again. If not, set the flag. | |
2391 | */ | |
2392 | if (rx->flags & IEEE80211_RX_CMNTR) | |
7c1e1831 | 2393 | goto out_free_skb; |
554891e6 | 2394 | rx->flags |= IEEE80211_RX_CMNTR; |
7c1e1831 | 2395 | |
3d30d949 MW |
2396 | if (skb_headroom(skb) < sizeof(*rthdr) && |
2397 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2398 | goto out_free_skb; | |
2399 | ||
2400 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2401 | memset(rthdr, 0, sizeof(*rthdr)); | |
2402 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2403 | rthdr->hdr.it_present = | |
2404 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2405 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2406 | ||
5f0b7de5 JB |
2407 | if (rate) { |
2408 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2409 | rthdr->hdr.it_present |= | |
2410 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2411 | } | |
3d30d949 MW |
2412 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2413 | ||
2414 | if (status->band == IEEE80211_BAND_5GHZ) | |
2415 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2416 | IEEE80211_CHAN_5GHZ); | |
2417 | else | |
2418 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2419 | IEEE80211_CHAN_2GHZ); | |
2420 | ||
2421 | skb_set_mac_header(skb, 0); | |
2422 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2423 | skb->pkt_type = PACKET_OTHERHOST; | |
2424 | skb->protocol = htons(ETH_P_802_2); | |
2425 | ||
2426 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2427 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2428 | continue; |
2429 | ||
05c914fe | 2430 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2431 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2432 | continue; | |
2433 | ||
2434 | if (prev_dev) { | |
2435 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2436 | if (skb2) { | |
2437 | skb2->dev = prev_dev; | |
5548a8a1 | 2438 | netif_receive_skb(skb2); |
3d30d949 MW |
2439 | } |
2440 | } | |
2441 | ||
2442 | prev_dev = sdata->dev; | |
2443 | sdata->dev->stats.rx_packets++; | |
2444 | sdata->dev->stats.rx_bytes += skb->len; | |
2445 | } | |
2446 | ||
2447 | if (prev_dev) { | |
2448 | skb->dev = prev_dev; | |
5548a8a1 | 2449 | netif_receive_skb(skb); |
554891e6 JB |
2450 | return; |
2451 | } | |
3d30d949 MW |
2452 | |
2453 | out_free_skb: | |
2454 | dev_kfree_skb(skb); | |
2455 | } | |
2456 | ||
aa0c8636 CL |
2457 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2458 | ieee80211_rx_result res) | |
2459 | { | |
2460 | switch (res) { | |
2461 | case RX_DROP_MONITOR: | |
2462 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2463 | if (rx->sta) | |
2464 | rx->sta->rx_dropped++; | |
2465 | /* fall through */ | |
2466 | case RX_CONTINUE: { | |
2467 | struct ieee80211_rate *rate = NULL; | |
2468 | struct ieee80211_supported_band *sband; | |
2469 | struct ieee80211_rx_status *status; | |
2470 | ||
2471 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2472 | ||
2473 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2474 | if (!(status->flag & RX_FLAG_HT)) | |
2475 | rate = &sband->bitrates[status->rate_idx]; | |
2476 | ||
2477 | ieee80211_rx_cooked_monitor(rx, rate); | |
2478 | break; | |
2479 | } | |
2480 | case RX_DROP_UNUSABLE: | |
2481 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2482 | if (rx->sta) | |
2483 | rx->sta->rx_dropped++; | |
2484 | dev_kfree_skb(rx->skb); | |
2485 | break; | |
2486 | case RX_QUEUED: | |
2487 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2488 | break; | |
2489 | } | |
2490 | } | |
571ecf67 | 2491 | |
24a8fdad | 2492 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) |
58905290 | 2493 | { |
58905290 | 2494 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2495 | struct sk_buff *skb; |
8944b79f | 2496 | |
e32f85f7 LCC |
2497 | #define CALL_RXH(rxh) \ |
2498 | do { \ | |
2499 | res = rxh(rx); \ | |
2500 | if (res != RX_CONTINUE) \ | |
2569a826 | 2501 | goto rxh_next; \ |
e32f85f7 | 2502 | } while (0); |
49461622 | 2503 | |
24a8fdad CL |
2504 | spin_lock(&rx->local->rx_skb_queue.lock); |
2505 | if (rx->local->running_rx_handler) | |
2506 | goto unlock; | |
2507 | ||
2508 | rx->local->running_rx_handler = true; | |
2509 | ||
2510 | while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { | |
2511 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2512 | ||
2569a826 JB |
2513 | /* |
2514 | * all the other fields are valid across frames | |
2515 | * that belong to an aMPDU since they are on the | |
2516 | * same TID from the same station | |
2517 | */ | |
2518 | rx->skb = skb; | |
2519 | ||
2520 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2521 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2522 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2523 | CALL_RXH(ieee80211_rx_h_defragment) | |
2524 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2525 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2526 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2527 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2528 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2529 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2530 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2531 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2532 | #endif |
2569a826 | 2533 | CALL_RXH(ieee80211_rx_h_data) |
24a8fdad | 2534 | CALL_RXH(ieee80211_rx_h_ctrl); |
2e161f78 | 2535 | CALL_RXH(ieee80211_rx_h_mgmt_check) |
2569a826 | 2536 | CALL_RXH(ieee80211_rx_h_action) |
2e161f78 JB |
2537 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) |
2538 | CALL_RXH(ieee80211_rx_h_action_return) | |
2569a826 | 2539 | CALL_RXH(ieee80211_rx_h_mgmt) |
49461622 | 2540 | |
aa0c8636 CL |
2541 | rxh_next: |
2542 | ieee80211_rx_handlers_result(rx, res); | |
24a8fdad | 2543 | spin_lock(&rx->local->rx_skb_queue.lock); |
49461622 | 2544 | #undef CALL_RXH |
aa0c8636 | 2545 | } |
24a8fdad CL |
2546 | |
2547 | rx->local->running_rx_handler = false; | |
2548 | ||
2549 | unlock: | |
2550 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
aa0c8636 CL |
2551 | } |
2552 | ||
4406c376 | 2553 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
aa0c8636 | 2554 | { |
aa0c8636 CL |
2555 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2556 | ||
aa0c8636 CL |
2557 | #define CALL_RXH(rxh) \ |
2558 | do { \ | |
2559 | res = rxh(rx); \ | |
2560 | if (res != RX_CONTINUE) \ | |
2561 | goto rxh_next; \ | |
2562 | } while (0); | |
2563 | ||
2564 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2565 | CALL_RXH(ieee80211_rx_h_check) | |
2566 | ||
24a8fdad | 2567 | ieee80211_rx_reorder_ampdu(rx); |
aa0c8636 | 2568 | |
24a8fdad | 2569 | ieee80211_rx_handlers(rx); |
aa0c8636 | 2570 | return; |
49461622 | 2571 | |
2569a826 | 2572 | rxh_next: |
aa0c8636 CL |
2573 | ieee80211_rx_handlers_result(rx, res); |
2574 | ||
2575 | #undef CALL_RXH | |
58905290 JB |
2576 | } |
2577 | ||
2bff8ebf | 2578 | /* |
dd318575 JB |
2579 | * This function makes calls into the RX path, therefore |
2580 | * it has to be invoked under RCU read lock. | |
2bff8ebf CL |
2581 | */ |
2582 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2583 | { | |
554891e6 JB |
2584 | struct ieee80211_rx_data rx = { |
2585 | .sta = sta, | |
2586 | .sdata = sta->sdata, | |
2587 | .local = sta->local, | |
2588 | .queue = tid, | |
fcf8bd3b | 2589 | .flags = 0, |
554891e6 | 2590 | }; |
2c15a0cf CL |
2591 | struct tid_ampdu_rx *tid_agg_rx; |
2592 | ||
2593 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2594 | if (!tid_agg_rx) | |
2595 | return; | |
2bff8ebf | 2596 | |
2c15a0cf | 2597 | spin_lock(&tid_agg_rx->reorder_lock); |
24a8fdad | 2598 | ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); |
2c15a0cf | 2599 | spin_unlock(&tid_agg_rx->reorder_lock); |
2bff8ebf | 2600 | |
24a8fdad | 2601 | ieee80211_rx_handlers(&rx); |
2bff8ebf CL |
2602 | } |
2603 | ||
571ecf67 JB |
2604 | /* main receive path */ |
2605 | ||
20b01f80 | 2606 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
23a24def JB |
2607 | struct ieee80211_hdr *hdr) |
2608 | { | |
20b01f80 | 2609 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
eb9fb5b8 JB |
2610 | struct sk_buff *skb = rx->skb; |
2611 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2612 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2613 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2614 | ||
51fb61e7 | 2615 | switch (sdata->vif.type) { |
05c914fe | 2616 | case NL80211_IFTYPE_STATION: |
9bc383de | 2617 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2618 | return 0; |
77fdaa12 | 2619 | if (!multicast && |
47846c9b | 2620 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4f312336 FF |
2621 | if (!(sdata->dev->flags & IFF_PROMISC) || |
2622 | sdata->u.mgd.use_4addr) | |
23a24def | 2623 | return 0; |
554891e6 | 2624 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2625 | } |
2626 | break; | |
05c914fe | 2627 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2628 | if (!bssid) |
2629 | return 0; | |
a7767f95 | 2630 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2631 | return 1; |
87291c02 | 2632 | } |
46900298 | 2633 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
554891e6 | 2634 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2635 | return 0; |
554891e6 | 2636 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2637 | } else if (!multicast && |
47846c9b | 2638 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2639 | hdr->addr1) != 0) { |
4150c572 | 2640 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2641 | return 0; |
554891e6 | 2642 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2643 | } else if (!rx->sta) { |
2644 | int rate_idx; | |
eb9fb5b8 | 2645 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2646 | rate_idx = 0; /* TODO: HT rates */ |
2647 | else | |
eb9fb5b8 | 2648 | rate_idx = status->rate_idx; |
34e89507 JB |
2649 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2650 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2651 | } |
23a24def | 2652 | break; |
05c914fe | 2653 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2654 | if (!multicast && |
47846c9b | 2655 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2656 | hdr->addr1) != 0) { |
2657 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2658 | return 0; | |
2659 | ||
554891e6 | 2660 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2661 | } |
2662 | break; | |
05c914fe JB |
2663 | case NL80211_IFTYPE_AP_VLAN: |
2664 | case NL80211_IFTYPE_AP: | |
23a24def | 2665 | if (!bssid) { |
47846c9b | 2666 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2667 | hdr->addr1)) |
2668 | return 0; | |
2669 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2670 | sdata->vif.addr)) { |
771bbd09 AN |
2671 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && |
2672 | !ieee80211_is_beacon(hdr->frame_control)) | |
23a24def | 2673 | return 0; |
554891e6 | 2674 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2675 | } |
23a24def | 2676 | break; |
05c914fe | 2677 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2678 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2679 | return 0; |
2680 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2681 | return 0; | |
2682 | break; | |
2ca27bcf | 2683 | default: |
fb1c1cd6 JB |
2684 | /* should never get here */ |
2685 | WARN_ON(1); | |
2686 | break; | |
23a24def JB |
2687 | } |
2688 | ||
2689 | return 1; | |
2690 | } | |
2691 | ||
4406c376 JB |
2692 | /* |
2693 | * This function returns whether or not the SKB | |
2694 | * was destined for RX processing or not, which, | |
2695 | * if consume is true, is equivalent to whether | |
2696 | * or not the skb was consumed. | |
2697 | */ | |
2698 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2699 | struct sk_buff *skb, bool consume) | |
2700 | { | |
2701 | struct ieee80211_local *local = rx->local; | |
2702 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2703 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2704 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2705 | int prepares; | |
2706 | ||
2707 | rx->skb = skb; | |
554891e6 | 2708 | status->rx_flags |= IEEE80211_RX_RA_MATCH; |
4406c376 JB |
2709 | prepares = prepare_for_handlers(rx, hdr); |
2710 | ||
2711 | if (!prepares) | |
2712 | return false; | |
2713 | ||
4406c376 JB |
2714 | if (!consume) { |
2715 | skb = skb_copy(skb, GFP_ATOMIC); | |
2716 | if (!skb) { | |
2717 | if (net_ratelimit()) | |
2718 | wiphy_debug(local->hw.wiphy, | |
b305dae4 | 2719 | "failed to copy skb for %s\n", |
4406c376 JB |
2720 | sdata->name); |
2721 | return true; | |
2722 | } | |
2723 | ||
2724 | rx->skb = skb; | |
2725 | } | |
2726 | ||
2727 | ieee80211_invoke_rx_handlers(rx); | |
2728 | return true; | |
2729 | } | |
2730 | ||
571ecf67 | 2731 | /* |
6368e4b1 RR |
2732 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2733 | * be called with rcu_read_lock protection. | |
571ecf67 | 2734 | */ |
71ebb4aa | 2735 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2736 | struct sk_buff *skb) |
571ecf67 | 2737 | { |
554891e6 | 2738 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2739 | struct ieee80211_local *local = hw_to_local(hw); |
2740 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2741 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2742 | __le16 fc; |
5cf121c3 | 2743 | struct ieee80211_rx_data rx; |
4406c376 | 2744 | struct ieee80211_sub_if_data *prev; |
56af3268 | 2745 | struct sta_info *sta, *tmp, *prev_sta; |
e3cf8b3f | 2746 | int err = 0; |
571ecf67 | 2747 | |
e3cf8b3f | 2748 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2749 | memset(&rx, 0, sizeof(rx)); |
2750 | rx.skb = skb; | |
2751 | rx.local = local; | |
72abd81b | 2752 | |
e3cf8b3f | 2753 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2754 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2755 | |
142b9f50 | 2756 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
b23b025f | 2757 | test_bit(SCAN_SW_SCANNING, &local->scanning))) |
554891e6 | 2758 | status->rx_flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2759 | |
e3cf8b3f ZY |
2760 | if (ieee80211_is_mgmt(fc)) |
2761 | err = skb_linearize(skb); | |
2762 | else | |
2763 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2764 | ||
2765 | if (err) { | |
2766 | dev_kfree_skb(skb); | |
2767 | return; | |
2768 | } | |
2769 | ||
2770 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2771 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2772 | ieee80211_verify_alignment(&rx); |
38f3714d | 2773 | |
e3cf8b3f | 2774 | if (ieee80211_is_data(fc)) { |
56af3268 | 2775 | prev_sta = NULL; |
4406c376 | 2776 | |
abe60632 | 2777 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
56af3268 BG |
2778 | if (!prev_sta) { |
2779 | prev_sta = sta; | |
2780 | continue; | |
2781 | } | |
2782 | ||
2783 | rx.sta = prev_sta; | |
2784 | rx.sdata = prev_sta->sdata; | |
4406c376 | 2785 | ieee80211_prepare_and_rx_handle(&rx, skb, false); |
abe60632 | 2786 | |
56af3268 | 2787 | prev_sta = sta; |
4406c376 | 2788 | } |
56af3268 BG |
2789 | |
2790 | if (prev_sta) { | |
2791 | rx.sta = prev_sta; | |
2792 | rx.sdata = prev_sta->sdata; | |
2793 | ||
4406c376 | 2794 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
56af3268 | 2795 | return; |
8e26d5ad | 2796 | goto out; |
56af3268 | 2797 | } |
4406c376 JB |
2798 | } |
2799 | ||
4b0dd98e | 2800 | prev = NULL; |
b2e7771e | 2801 | |
4b0dd98e JB |
2802 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2803 | if (!ieee80211_sdata_running(sdata)) | |
2804 | continue; | |
340e11f3 | 2805 | |
4b0dd98e JB |
2806 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2807 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2808 | continue; | |
340e11f3 | 2809 | |
4b0dd98e JB |
2810 | /* |
2811 | * frame is destined for this interface, but if it's | |
2812 | * not also for the previous one we handle that after | |
2813 | * the loop to avoid copying the SKB once too much | |
2814 | */ | |
4bb29f8c | 2815 | |
4b0dd98e | 2816 | if (!prev) { |
abe60632 | 2817 | prev = sdata; |
4b0dd98e | 2818 | continue; |
340e11f3 | 2819 | } |
4bb29f8c | 2820 | |
4b0dd98e JB |
2821 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
2822 | rx.sdata = prev; | |
2823 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
4bb29f8c | 2824 | |
4b0dd98e JB |
2825 | prev = sdata; |
2826 | } | |
2827 | ||
2828 | if (prev) { | |
2829 | rx.sta = sta_info_get_bss(prev, hdr->addr2); | |
2830 | rx.sdata = prev; | |
4406c376 | 2831 | |
4b0dd98e JB |
2832 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
2833 | return; | |
571ecf67 | 2834 | } |
4406c376 | 2835 | |
8e26d5ad | 2836 | out: |
4406c376 | 2837 | dev_kfree_skb(skb); |
571ecf67 | 2838 | } |
6368e4b1 RR |
2839 | |
2840 | /* | |
2841 | * This is the receive path handler. It is called by a low level driver when an | |
2842 | * 802.11 MPDU is received from the hardware. | |
2843 | */ | |
103bf9f7 | 2844 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2845 | { |
2846 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2847 | struct ieee80211_rate *rate = NULL; |
2848 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2849 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2850 | |
d20ef63d JB |
2851 | WARN_ON_ONCE(softirq_count() == 0); |
2852 | ||
77a980dc JB |
2853 | if (WARN_ON(status->band < 0 || |
2854 | status->band >= IEEE80211_NUM_BANDS)) | |
2855 | goto drop; | |
8318d78a JB |
2856 | |
2857 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2858 | if (WARN_ON(!sband)) |
2859 | goto drop; | |
8318d78a | 2860 | |
89c3a8ac JB |
2861 | /* |
2862 | * If we're suspending, it is possible although not too likely | |
2863 | * that we'd be receiving frames after having already partially | |
2864 | * quiesced the stack. We can't process such frames then since | |
2865 | * that might, for example, cause stations to be added or other | |
2866 | * driver callbacks be invoked. | |
2867 | */ | |
77a980dc JB |
2868 | if (unlikely(local->quiescing || local->suspended)) |
2869 | goto drop; | |
89c3a8ac | 2870 | |
ea77f12f JB |
2871 | /* |
2872 | * The same happens when we're not even started, | |
2873 | * but that's worth a warning. | |
2874 | */ | |
77a980dc JB |
2875 | if (WARN_ON(!local->started)) |
2876 | goto drop; | |
ea77f12f | 2877 | |
fc885189 | 2878 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 2879 | /* |
fc885189 JB |
2880 | * Validate the rate, unless a PLCP error means that |
2881 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 2882 | */ |
fc885189 JB |
2883 | |
2884 | if (status->flag & RX_FLAG_HT) { | |
2885 | /* | |
2886 | * rate_idx is MCS index, which can be [0-76] | |
2887 | * as documented on: | |
2888 | * | |
2889 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2890 | * | |
2891 | * Anything else would be some sort of driver or | |
2892 | * hardware error. The driver should catch hardware | |
2893 | * errors. | |
2894 | */ | |
2895 | if (WARN((status->rate_idx < 0 || | |
2896 | status->rate_idx > 76), | |
2897 | "Rate marked as an HT rate but passed " | |
2898 | "status->rate_idx is not " | |
2899 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2900 | status->rate_idx, | |
2901 | status->rate_idx)) | |
2902 | goto drop; | |
2903 | } else { | |
2904 | if (WARN_ON(status->rate_idx < 0 || | |
2905 | status->rate_idx >= sband->n_bitrates)) | |
2906 | goto drop; | |
2907 | rate = &sband->bitrates[status->rate_idx]; | |
2908 | } | |
0fb8ca45 | 2909 | } |
6368e4b1 | 2910 | |
554891e6 JB |
2911 | status->rx_flags = 0; |
2912 | ||
6368e4b1 RR |
2913 | /* |
2914 | * key references and virtual interfaces are protected using RCU | |
2915 | * and this requires that we are in a read-side RCU section during | |
2916 | * receive processing | |
2917 | */ | |
2918 | rcu_read_lock(); | |
2919 | ||
2920 | /* | |
2921 | * Frames with failed FCS/PLCP checksum are not returned, | |
2922 | * all other frames are returned without radiotap header | |
2923 | * if it was previously present. | |
2924 | * Also, frames with less than 16 bytes are dropped. | |
2925 | */ | |
f1d58c25 | 2926 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2927 | if (!skb) { |
2928 | rcu_read_unlock(); | |
2929 | return; | |
2930 | } | |
2931 | ||
e1e54068 JB |
2932 | ieee80211_tpt_led_trig_rx(local, |
2933 | ((struct ieee80211_hdr *)skb->data)->frame_control, | |
2934 | skb->len); | |
071d9ac2 | 2935 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
2936 | |
2937 | rcu_read_unlock(); | |
77a980dc JB |
2938 | |
2939 | return; | |
2940 | drop: | |
2941 | kfree_skb(skb); | |
6368e4b1 | 2942 | } |
103bf9f7 | 2943 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2944 | |
2945 | /* This is a version of the rx handler that can be called from hard irq | |
2946 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2947 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2948 | { |
2949 | struct ieee80211_local *local = hw_to_local(hw); | |
2950 | ||
2951 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2952 | ||
571ecf67 JB |
2953 | skb->pkt_type = IEEE80211_RX_MSG; |
2954 | skb_queue_tail(&local->skb_queue, skb); | |
2955 | tasklet_schedule(&local->tasklet); | |
2956 | } | |
2957 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |