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Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
84040805 | 5 | * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> |
571ecf67 JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
571ecf67 JB |
14 | #include <linux/kernel.h> |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/etherdevice.h> | |
d4e46a3d | 18 | #include <linux/rcupdate.h> |
571ecf67 JB |
19 | #include <net/mac80211.h> |
20 | #include <net/ieee80211_radiotap.h> | |
21 | ||
22 | #include "ieee80211_i.h" | |
24487981 | 23 | #include "driver-ops.h" |
2c8dccc7 | 24 | #include "led.h" |
33b64eb2 | 25 | #include "mesh.h" |
571ecf67 JB |
26 | #include "wep.h" |
27 | #include "wpa.h" | |
28 | #include "tkip.h" | |
29 | #include "wme.h" | |
30 | ||
b2e7771e JB |
31 | /* |
32 | * monitor mode reception | |
33 | * | |
34 | * This function cleans up the SKB, i.e. it removes all the stuff | |
35 | * only useful for monitoring. | |
36 | */ | |
37 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 38 | struct sk_buff *skb) |
b2e7771e | 39 | { |
b2e7771e JB |
40 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
41 | if (likely(skb->len > FCS_LEN)) | |
e3cf8b3f | 42 | __pskb_trim(skb, skb->len - FCS_LEN); |
b2e7771e JB |
43 | else { |
44 | /* driver bug */ | |
45 | WARN_ON(1); | |
46 | dev_kfree_skb(skb); | |
47 | skb = NULL; | |
48 | } | |
49 | } | |
50 | ||
51 | return skb; | |
52 | } | |
53 | ||
f1d58c25 | 54 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 55 | int present_fcs_len) |
b2e7771e | 56 | { |
f1d58c25 | 57 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 58 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
59 | |
60 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
61 | return 1; | |
0869aea0 | 62 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 63 | return 1; |
87228f57 HH |
64 | if (ieee80211_is_ctl(hdr->frame_control) && |
65 | !ieee80211_is_pspoll(hdr->frame_control) && | |
66 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
67 | return 1; |
68 | return 0; | |
69 | } | |
70 | ||
601ae7f2 BR |
71 | static int |
72 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
73 | struct ieee80211_rx_status *status) | |
74 | { | |
75 | int len; | |
76 | ||
77 | /* always present fields */ | |
78 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
79 | ||
80 | if (status->flag & RX_FLAG_TSFT) | |
81 | len += 8; | |
7fee5372 | 82 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 | 83 | len += 1; |
601ae7f2 BR |
84 | |
85 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
86 | len++; | |
87 | ||
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 */ | |
126 | if (status->flag & RX_FLAG_TSFT) { | |
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 MSS |
145 | * MCS information is a separate field in radiotap, |
146 | * added below. | |
0fb8ca45 JM |
147 | */ |
148 | *pos = 0; | |
8d6f658e | 149 | } else { |
ebe6c7ba | 150 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 151 | *pos = rate->bitrate / 5; |
8d6f658e | 152 | } |
601ae7f2 BR |
153 | pos++; |
154 | ||
155 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 156 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
157 | pos += 2; |
158 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
159 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
160 | pos); | |
5f0b7de5 JB |
161 | else if (status->flag & RX_FLAG_HT) |
162 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
163 | pos); | |
9deb1ae5 | 164 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
165 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
166 | pos); | |
601ae7f2 | 167 | else |
6a86b9c7 JB |
168 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
169 | pos); | |
601ae7f2 BR |
170 | pos += 2; |
171 | ||
172 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
173 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
174 | *pos = status->signal; | |
175 | rthdr->it_present |= | |
176 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
177 | pos++; | |
178 | } | |
179 | ||
601ae7f2 BR |
180 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
181 | ||
182 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
183 | *pos = status->antenna; | |
184 | pos++; | |
185 | ||
601ae7f2 BR |
186 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
187 | ||
188 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
189 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 190 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 191 | pos++; |
aae89831 | 192 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
193 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
194 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 | 195 | pos += 2; |
6d744bac JB |
196 | |
197 | if (status->flag & RX_FLAG_HT) { | |
198 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); | |
199 | *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS | | |
200 | IEEE80211_RADIOTAP_MCS_HAVE_GI | | |
201 | IEEE80211_RADIOTAP_MCS_HAVE_BW; | |
202 | *pos = 0; | |
203 | if (status->flag & RX_FLAG_SHORT_GI) | |
204 | *pos |= IEEE80211_RADIOTAP_MCS_SGI; | |
205 | if (status->flag & RX_FLAG_40MHZ) | |
206 | *pos |= IEEE80211_RADIOTAP_MCS_BW_40; | |
207 | pos++; | |
208 | *pos++ = status->rate_idx; | |
209 | } | |
601ae7f2 BR |
210 | } |
211 | ||
b2e7771e JB |
212 | /* |
213 | * This function copies a received frame to all monitor interfaces and | |
214 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
215 | * radiotap header the driver might have added. | |
216 | */ | |
217 | static struct sk_buff * | |
218 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 219 | struct ieee80211_rate *rate) |
b2e7771e | 220 | { |
f1d58c25 | 221 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 222 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 223 | int needed_headroom = 0; |
b2e7771e JB |
224 | struct sk_buff *skb, *skb2; |
225 | struct net_device *prev_dev = NULL; | |
226 | int present_fcs_len = 0; | |
b2e7771e JB |
227 | |
228 | /* | |
229 | * First, we may need to make a copy of the skb because | |
230 | * (1) we need to modify it for radiotap (if not present), and | |
231 | * (2) the other RX handlers will modify the skb we got. | |
232 | * | |
233 | * We don't need to, of course, if we aren't going to return | |
234 | * the SKB because it has a bad FCS/PLCP checksum. | |
235 | */ | |
0869aea0 JB |
236 | |
237 | /* room for the radiotap header based on driver features */ | |
238 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
239 | |
240 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
241 | present_fcs_len = FCS_LEN; | |
242 | ||
e3cf8b3f ZY |
243 | /* make sure hdr->frame_control is on the linear part */ |
244 | if (!pskb_may_pull(origskb, 2)) { | |
245 | dev_kfree_skb(origskb); | |
246 | return NULL; | |
247 | } | |
248 | ||
b2e7771e | 249 | if (!local->monitors) { |
0869aea0 | 250 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
251 | dev_kfree_skb(origskb); |
252 | return NULL; | |
253 | } | |
254 | ||
0869aea0 | 255 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
256 | } |
257 | ||
0869aea0 | 258 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
259 | /* only need to expand headroom if necessary */ |
260 | skb = origskb; | |
261 | origskb = NULL; | |
262 | ||
263 | /* | |
264 | * This shouldn't trigger often because most devices have an | |
265 | * RX header they pull before we get here, and that should | |
266 | * be big enough for our radiotap information. We should | |
267 | * probably export the length to drivers so that we can have | |
268 | * them allocate enough headroom to start with. | |
269 | */ | |
270 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 271 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
272 | dev_kfree_skb(skb); |
273 | return NULL; | |
274 | } | |
275 | } else { | |
276 | /* | |
277 | * Need to make a copy and possibly remove radiotap header | |
278 | * and FCS from the original. | |
279 | */ | |
280 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
281 | ||
0869aea0 | 282 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
283 | |
284 | if (!skb) | |
285 | return origskb; | |
286 | } | |
287 | ||
0869aea0 JB |
288 | /* prepend radiotap information */ |
289 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 290 | |
ce3edf6d | 291 | skb_reset_mac_header(skb); |
b2e7771e JB |
292 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
293 | skb->pkt_type = PACKET_OTHERHOST; | |
294 | skb->protocol = htons(ETH_P_802_2); | |
295 | ||
296 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 297 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
298 | continue; |
299 | ||
3d30d949 MW |
300 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
301 | continue; | |
302 | ||
9607e6b6 | 303 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
304 | continue; |
305 | ||
b2e7771e JB |
306 | if (prev_dev) { |
307 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
308 | if (skb2) { | |
309 | skb2->dev = prev_dev; | |
5548a8a1 | 310 | netif_receive_skb(skb2); |
b2e7771e JB |
311 | } |
312 | } | |
313 | ||
314 | prev_dev = sdata->dev; | |
315 | sdata->dev->stats.rx_packets++; | |
316 | sdata->dev->stats.rx_bytes += skb->len; | |
317 | } | |
318 | ||
319 | if (prev_dev) { | |
320 | skb->dev = prev_dev; | |
5548a8a1 | 321 | netif_receive_skb(skb); |
b2e7771e JB |
322 | } else |
323 | dev_kfree_skb(skb); | |
324 | ||
325 | return origskb; | |
326 | } | |
327 | ||
328 | ||
5cf121c3 | 329 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 330 | { |
238f74a2 | 331 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 332 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
6e0d114d JB |
333 | int tid; |
334 | ||
335 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
336 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
337 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 338 | /* frame has qos control */ |
238f74a2 HH |
339 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
340 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
554891e6 | 341 | status->rx_flags |= IEEE80211_RX_AMSDU; |
6e0d114d | 342 | } else { |
1411f9b5 JB |
343 | /* |
344 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
345 | * | |
346 | * Sequence numbers for management frames, QoS data | |
347 | * frames with a broadcast/multicast address in the | |
348 | * Address 1 field, and all non-QoS data frames sent | |
349 | * by QoS STAs are assigned using an additional single | |
350 | * modulo-4096 counter, [...] | |
351 | * | |
352 | * We also use that counter for non-QoS STAs. | |
353 | */ | |
354 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 355 | } |
52865dfd | 356 | |
5cf121c3 | 357 | rx->queue = tid; |
6e0d114d JB |
358 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
359 | * For now, set skb->priority to 0 for other cases. */ | |
360 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 361 | } |
6e0d114d | 362 | |
d1c3a37c JB |
363 | /** |
364 | * DOC: Packet alignment | |
365 | * | |
366 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
367 | * to the stack. | |
368 | * | |
369 | * Additionally, should, if possible, align the payload data in a way that | |
370 | * guarantees that the contained IP header is aligned to a four-byte | |
371 | * boundary. In the case of regular frames, this simply means aligning the | |
372 | * payload to a four-byte boundary (because either the IP header is directly | |
373 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
374 | * in front of it). If the payload data is not properly aligned and the |
375 | * architecture doesn't support efficient unaligned operations, mac80211 | |
376 | * will align the data. | |
d1c3a37c JB |
377 | * |
378 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
379 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
380 | * push the IP header further back to a multiple of four again. Thankfully, the | |
381 | * specs were sane enough this time around to require padding each A-MSDU | |
382 | * subframe to a length that is a multiple of four. | |
383 | * | |
384 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
385 | * the payload is not supported, the driver is required to move the 802.11 | |
386 | * header to be directly in front of the payload in that case. | |
387 | */ | |
388 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 389 | { |
59d9cb07 KV |
390 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
391 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
392 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 393 | #endif |
6e0d114d JB |
394 | } |
395 | ||
6368e4b1 | 396 | |
571ecf67 JB |
397 | /* rx handlers */ |
398 | ||
49461622 | 399 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 400 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
401 | { |
402 | struct ieee80211_local *local = rx->local; | |
554891e6 | 403 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
404 | struct sk_buff *skb = rx->skb; |
405 | ||
554891e6 | 406 | if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN))) |
4080c7cd JB |
407 | return RX_CONTINUE; |
408 | ||
b23b025f BG |
409 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) || |
410 | test_bit(SCAN_SW_SCANNING, &local->scanning)) | |
f1d58c25 | 411 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 412 | |
4080c7cd JB |
413 | /* scanning finished during invoking of handlers */ |
414 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
415 | return RX_DROP_UNUSABLE; | |
571ecf67 JB |
416 | } |
417 | ||
3cfcf6ac JM |
418 | |
419 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
420 | { | |
421 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
422 | ||
423 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
424 | return 0; | |
425 | ||
426 | return ieee80211_is_robust_mgmt_frame(hdr); | |
427 | } | |
428 | ||
429 | ||
430 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
431 | { | |
432 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
433 | ||
434 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
435 | return 0; | |
436 | ||
437 | return ieee80211_is_robust_mgmt_frame(hdr); | |
438 | } | |
439 | ||
440 | ||
441 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
442 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
443 | { | |
444 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
445 | struct ieee80211_mmie *mmie; | |
446 | ||
447 | if (skb->len < 24 + sizeof(*mmie) || | |
448 | !is_multicast_ether_addr(hdr->da)) | |
449 | return -1; | |
450 | ||
451 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
452 | return -1; /* not a robust management frame */ | |
453 | ||
454 | mmie = (struct ieee80211_mmie *) | |
455 | (skb->data + skb->len - sizeof(*mmie)); | |
456 | if (mmie->element_id != WLAN_EID_MMIE || | |
457 | mmie->length != sizeof(*mmie) - 2) | |
458 | return -1; | |
459 | ||
460 | return le16_to_cpu(mmie->key_id); | |
461 | } | |
462 | ||
463 | ||
33b64eb2 | 464 | static ieee80211_rx_result |
5cf121c3 | 465 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 466 | { |
a7767f95 HH |
467 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
468 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 469 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 470 | |
a7767f95 | 471 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
472 | if (is_multicast_ether_addr(hdr->addr1)) { |
473 | if (ieee80211_has_tods(hdr->frame_control) || | |
474 | !ieee80211_has_fromds(hdr->frame_control)) | |
475 | return RX_DROP_MONITOR; | |
476 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
477 | return RX_DROP_MONITOR; | |
478 | } else { | |
479 | if (!ieee80211_has_a4(hdr->frame_control)) | |
480 | return RX_DROP_MONITOR; | |
481 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
482 | return RX_DROP_MONITOR; | |
483 | } | |
33b64eb2 LCC |
484 | } |
485 | ||
486 | /* If there is not an established peer link and this is not a peer link | |
487 | * establisment frame, beacon or probe, drop the frame. | |
488 | */ | |
489 | ||
b4e08ea1 | 490 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 491 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 492 | |
a7767f95 | 493 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
494 | return RX_DROP_MONITOR; |
495 | ||
a7767f95 | 496 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 497 | mgmt = (struct ieee80211_mgmt *)hdr; |
97ad9139 | 498 | if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK) |
33b64eb2 | 499 | return RX_DROP_MONITOR; |
33b64eb2 | 500 | return RX_CONTINUE; |
33b64eb2 LCC |
501 | } |
502 | ||
a7767f95 HH |
503 | if (ieee80211_is_probe_req(hdr->frame_control) || |
504 | ieee80211_is_probe_resp(hdr->frame_control) || | |
505 | ieee80211_is_beacon(hdr->frame_control)) | |
506 | return RX_CONTINUE; | |
507 | ||
508 | return RX_DROP_MONITOR; | |
509 | ||
510 | } | |
511 | ||
512 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
513 | ||
514 | if (ieee80211_is_data(hdr->frame_control) && | |
515 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 516 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 517 | return RX_DROP_MONITOR; |
902acc78 | 518 | #undef msh_h_get |
d6d1a5a7 | 519 | |
902acc78 JB |
520 | return RX_CONTINUE; |
521 | } | |
33b64eb2 | 522 | |
1edfb1af JB |
523 | #define SEQ_MODULO 0x1000 |
524 | #define SEQ_MASK 0xfff | |
525 | ||
526 | static inline int seq_less(u16 sq1, u16 sq2) | |
527 | { | |
528 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
529 | } | |
530 | ||
531 | static inline u16 seq_inc(u16 sq) | |
532 | { | |
533 | return (sq + 1) & SEQ_MASK; | |
534 | } | |
535 | ||
536 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
537 | { | |
538 | return (sq1 - sq2) & SEQ_MASK; | |
539 | } | |
540 | ||
541 | ||
542 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
543 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 544 | int index) |
1edfb1af | 545 | { |
24a8fdad | 546 | struct ieee80211_local *local = hw_to_local(hw); |
1edfb1af | 547 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
4cfda47b | 548 | struct ieee80211_rx_status *status; |
1edfb1af | 549 | |
dd318575 JB |
550 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
551 | ||
1edfb1af JB |
552 | if (!skb) |
553 | goto no_frame; | |
554 | ||
071d9ac2 | 555 | /* release the frame from the reorder ring buffer */ |
1edfb1af JB |
556 | tid_agg_rx->stored_mpdu_num--; |
557 | tid_agg_rx->reorder_buf[index] = NULL; | |
4cfda47b CL |
558 | status = IEEE80211_SKB_RXCB(skb); |
559 | status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; | |
24a8fdad | 560 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af JB |
561 | |
562 | no_frame: | |
563 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
564 | } | |
565 | ||
566 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
567 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 568 | u16 head_seq_num) |
1edfb1af JB |
569 | { |
570 | int index; | |
571 | ||
dd318575 JB |
572 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
573 | ||
1edfb1af JB |
574 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
575 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
576 | tid_agg_rx->buf_size; | |
24a8fdad | 577 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
1edfb1af JB |
578 | } |
579 | } | |
580 | ||
581 | /* | |
582 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
583 | * the skb was added to the buffer longer than this time ago, the earlier | |
584 | * frames that have not yet been received are assumed to be lost and the skb | |
585 | * can be released for processing. This may also release other skb's from the | |
586 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
587 | * |
588 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
589 | */ |
590 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
591 | ||
aa0c8636 | 592 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
24a8fdad | 593 | struct tid_ampdu_rx *tid_agg_rx) |
aa0c8636 | 594 | { |
2bff8ebf | 595 | int index, j; |
aa0c8636 | 596 | |
dd318575 JB |
597 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
598 | ||
aa0c8636 CL |
599 | /* release the buffer until next missing frame */ |
600 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
601 | tid_agg_rx->buf_size; | |
602 | if (!tid_agg_rx->reorder_buf[index] && | |
603 | tid_agg_rx->stored_mpdu_num > 1) { | |
604 | /* | |
605 | * No buffers ready to be released, but check whether any | |
606 | * frames in the reorder buffer have timed out. | |
607 | */ | |
aa0c8636 CL |
608 | int skipped = 1; |
609 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
610 | j = (j + 1) % tid_agg_rx->buf_size) { | |
611 | if (!tid_agg_rx->reorder_buf[j]) { | |
612 | skipped++; | |
613 | continue; | |
614 | } | |
615 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
616 | HT_RX_REORDER_BUF_TIMEOUT)) | |
2bff8ebf | 617 | goto set_release_timer; |
aa0c8636 CL |
618 | |
619 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
620 | if (net_ratelimit()) | |
0fb9a9ec JP |
621 | wiphy_debug(hw->wiphy, |
622 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
aa0c8636 | 623 | #endif |
24a8fdad | 624 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
aa0c8636 CL |
625 | |
626 | /* | |
627 | * Increment the head seq# also for the skipped slots. | |
628 | */ | |
629 | tid_agg_rx->head_seq_num = | |
630 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
631 | skipped = 0; | |
632 | } | |
633 | } else while (tid_agg_rx->reorder_buf[index]) { | |
24a8fdad | 634 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
aa0c8636 CL |
635 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
636 | tid_agg_rx->buf_size; | |
637 | } | |
2bff8ebf CL |
638 | |
639 | if (tid_agg_rx->stored_mpdu_num) { | |
640 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
641 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
642 | ||
643 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
644 | j = (j + 1) % tid_agg_rx->buf_size) { | |
645 | if (tid_agg_rx->reorder_buf[j]) | |
646 | break; | |
647 | } | |
648 | ||
649 | set_release_timer: | |
650 | ||
651 | mod_timer(&tid_agg_rx->reorder_timer, | |
652 | tid_agg_rx->reorder_time[j] + | |
653 | HT_RX_REORDER_BUF_TIMEOUT); | |
654 | } else { | |
655 | del_timer(&tid_agg_rx->reorder_timer); | |
656 | } | |
aa0c8636 CL |
657 | } |
658 | ||
1edfb1af JB |
659 | /* |
660 | * As this function belongs to the RX path it must be under | |
661 | * rcu_read_lock protection. It returns false if the frame | |
662 | * can be processed immediately, true if it was consumed. | |
663 | */ | |
664 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
665 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 666 | struct sk_buff *skb) |
1edfb1af JB |
667 | { |
668 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
669 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
670 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
671 | u16 head_seq_num, buf_size; | |
672 | int index; | |
2bff8ebf | 673 | bool ret = true; |
1edfb1af | 674 | |
dd318575 JB |
675 | spin_lock(&tid_agg_rx->reorder_lock); |
676 | ||
1edfb1af JB |
677 | buf_size = tid_agg_rx->buf_size; |
678 | head_seq_num = tid_agg_rx->head_seq_num; | |
679 | ||
680 | /* frame with out of date sequence number */ | |
681 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
682 | dev_kfree_skb(skb); | |
2bff8ebf | 683 | goto out; |
1edfb1af JB |
684 | } |
685 | ||
686 | /* | |
687 | * If frame the sequence number exceeds our buffering window | |
688 | * size release some previous frames to make room for this one. | |
689 | */ | |
690 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
691 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
692 | /* release stored frames up to new head to stack */ | |
24a8fdad | 693 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); |
1edfb1af JB |
694 | } |
695 | ||
696 | /* Now the new frame is always in the range of the reordering buffer */ | |
697 | ||
698 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
699 | ||
700 | /* check if we already stored this frame */ | |
701 | if (tid_agg_rx->reorder_buf[index]) { | |
702 | dev_kfree_skb(skb); | |
2bff8ebf | 703 | goto out; |
1edfb1af JB |
704 | } |
705 | ||
706 | /* | |
707 | * If the current MPDU is in the right order and nothing else | |
708 | * is stored we can process it directly, no need to buffer it. | |
709 | */ | |
710 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
711 | tid_agg_rx->stored_mpdu_num == 0) { | |
712 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
713 | ret = false; |
714 | goto out; | |
1edfb1af JB |
715 | } |
716 | ||
717 | /* put the frame in the reordering buffer */ | |
718 | tid_agg_rx->reorder_buf[index] = skb; | |
719 | tid_agg_rx->reorder_time[index] = jiffies; | |
720 | tid_agg_rx->stored_mpdu_num++; | |
24a8fdad | 721 | ieee80211_sta_reorder_release(hw, tid_agg_rx); |
1edfb1af | 722 | |
2bff8ebf CL |
723 | out: |
724 | spin_unlock(&tid_agg_rx->reorder_lock); | |
725 | return ret; | |
1edfb1af JB |
726 | } |
727 | ||
728 | /* | |
729 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
730 | * true if the MPDU was buffered, false if it should be processed. | |
731 | */ | |
24a8fdad | 732 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) |
1edfb1af | 733 | { |
2569a826 JB |
734 | struct sk_buff *skb = rx->skb; |
735 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
736 | struct ieee80211_hw *hw = &local->hw; |
737 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 738 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
739 | struct tid_ampdu_rx *tid_agg_rx; |
740 | u16 sc; | |
741 | int tid; | |
742 | ||
743 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 744 | goto dont_reorder; |
1edfb1af JB |
745 | |
746 | /* | |
747 | * filter the QoS data rx stream according to | |
748 | * STA/TID and check if this STA/TID is on aggregation | |
749 | */ | |
750 | ||
1edfb1af | 751 | if (!sta) |
2569a826 | 752 | goto dont_reorder; |
1edfb1af JB |
753 | |
754 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
755 | ||
a87f736d JB |
756 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
757 | if (!tid_agg_rx) | |
758 | goto dont_reorder; | |
1edfb1af JB |
759 | |
760 | /* qos null data frames are excluded */ | |
761 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 762 | goto dont_reorder; |
1edfb1af JB |
763 | |
764 | /* new, potentially un-ordered, ampdu frame - process it */ | |
765 | ||
766 | /* reset session timer */ | |
767 | if (tid_agg_rx->timeout) | |
768 | mod_timer(&tid_agg_rx->session_timer, | |
769 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
770 | ||
771 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
772 | sc = le16_to_cpu(hdr->seq_ctrl); | |
773 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 774 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
775 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
776 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 777 | return; |
1edfb1af JB |
778 | } |
779 | ||
a87f736d JB |
780 | /* |
781 | * No locking needed -- we will only ever process one | |
782 | * RX packet at a time, and thus own tid_agg_rx. All | |
783 | * other code manipulating it needs to (and does) make | |
784 | * sure that we cannot get to it any more before doing | |
785 | * anything with it. | |
786 | */ | |
24a8fdad | 787 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) |
2569a826 JB |
788 | return; |
789 | ||
790 | dont_reorder: | |
24a8fdad | 791 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af | 792 | } |
33b64eb2 | 793 | |
49461622 | 794 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 795 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 796 | { |
a7767f95 | 797 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 798 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
799 | |
800 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
801 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 802 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 803 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 804 | hdr->seq_ctrl)) { |
554891e6 | 805 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
806 | rx->local->dot11FrameDuplicateCount++; |
807 | rx->sta->num_duplicates++; | |
808 | } | |
b1f93314 | 809 | return RX_DROP_UNUSABLE; |
571ecf67 | 810 | } else |
5cf121c3 | 811 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
812 | } |
813 | ||
571ecf67 JB |
814 | if (unlikely(rx->skb->len < 16)) { |
815 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 816 | return RX_DROP_MONITOR; |
571ecf67 JB |
817 | } |
818 | ||
571ecf67 JB |
819 | /* Drop disallowed frame classes based on STA auth/assoc state; |
820 | * IEEE 802.11, Chap 5.5. | |
821 | * | |
ccd7b362 JB |
822 | * mac80211 filters only based on association state, i.e. it drops |
823 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
824 | * deauth/disassoc frames when needed. In addition, hostapd is |
825 | * responsible for filtering on both auth and assoc states. | |
826 | */ | |
33b64eb2 | 827 | |
902acc78 | 828 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 829 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 830 | |
a7767f95 HH |
831 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
832 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 833 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
1be7fe8d | 834 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && |
07346f81 | 835 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
836 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
837 | !ieee80211_has_tods(hdr->frame_control) && | |
838 | ieee80211_is_data(hdr->frame_control)) || | |
554891e6 | 839 | !(status->rx_flags & IEEE80211_RX_RA_MATCH)) { |
571ecf67 JB |
840 | /* Drop IBSS frames and frames for other hosts |
841 | * silently. */ | |
e4c26add | 842 | return RX_DROP_MONITOR; |
571ecf67 JB |
843 | } |
844 | ||
e4c26add | 845 | return RX_DROP_MONITOR; |
571ecf67 JB |
846 | } |
847 | ||
9ae54c84 | 848 | return RX_CONTINUE; |
570bd537 JB |
849 | } |
850 | ||
851 | ||
49461622 | 852 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 853 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 854 | { |
eb9fb5b8 JB |
855 | struct sk_buff *skb = rx->skb; |
856 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
857 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
858 | int keyidx; |
859 | int hdrlen; | |
e4c26add | 860 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
e31b8213 | 861 | struct ieee80211_key *sta_ptk = NULL; |
3cfcf6ac | 862 | int mmie_keyidx = -1; |
761ab470 | 863 | __le16 fc; |
570bd537 | 864 | |
3017b80b JB |
865 | /* |
866 | * Key selection 101 | |
867 | * | |
3cfcf6ac | 868 | * There are four types of keys: |
3017b80b | 869 | * - GTK (group keys) |
3cfcf6ac | 870 | * - IGTK (group keys for management frames) |
3017b80b JB |
871 | * - PTK (pairwise keys) |
872 | * - STK (station-to-station pairwise keys) | |
873 | * | |
874 | * When selecting a key, we have to distinguish between multicast | |
875 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
876 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
877 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
878 | * unicast frames can also use key indices like GTKs. Hence, if we | |
879 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 880 | * |
8dc06a1c JB |
881 | * Note that in a regular BSS, multicast frames are sent by the |
882 | * AP only, associated stations unicast the frame to the AP first | |
883 | * which then multicasts it on their behalf. | |
884 | * | |
3017b80b JB |
885 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
886 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
887 | * The spec seems to expect that one negotiates the same key with |
888 | * every station but there's no such requirement; VLANs could be | |
889 | * possible. | |
3017b80b JB |
890 | */ |
891 | ||
3017b80b | 892 | /* |
1990af8d | 893 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
894 | * addressed to us nor a multicast frame. |
895 | */ | |
554891e6 | 896 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 897 | return RX_CONTINUE; |
3017b80b | 898 | |
2569a826 JB |
899 | /* start without a key */ |
900 | rx->key = NULL; | |
901 | ||
d4e46a3d | 902 | if (rx->sta) |
e31b8213 | 903 | sta_ptk = rcu_dereference(rx->sta->ptk); |
d4e46a3d | 904 | |
761ab470 JB |
905 | fc = hdr->frame_control; |
906 | ||
907 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
908 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
909 | ||
e31b8213 JB |
910 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
911 | rx->key = sta_ptk; | |
dc1580dd JB |
912 | if ((status->flag & RX_FLAG_DECRYPTED) && |
913 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
914 | return RX_CONTINUE; | |
0c7c10c7 | 915 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 916 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 917 | return RX_CONTINUE; |
3cfcf6ac JM |
918 | } else if (mmie_keyidx >= 0) { |
919 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
920 | if ((status->flag & RX_FLAG_DECRYPTED) && |
921 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
922 | return RX_CONTINUE; |
923 | ||
924 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
925 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
926 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
e31b8213 JB |
927 | if (rx->sta) |
928 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
929 | if (!rx->key) | |
930 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 931 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
932 | /* |
933 | * The frame was not protected, so skip decryption. However, we | |
934 | * need to set rx->key if there is a key that could have been | |
935 | * used so that the frame may be dropped if encryption would | |
936 | * have been expected. | |
937 | */ | |
938 | struct ieee80211_key *key = NULL; | |
897bed8b JB |
939 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
940 | int i; | |
941 | ||
761ab470 | 942 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
943 | is_multicast_ether_addr(hdr->addr1) && |
944 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
945 | rx->key = key; | |
897bed8b JB |
946 | else { |
947 | if (rx->sta) { | |
948 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
949 | key = rcu_dereference(rx->sta->gtk[i]); | |
950 | if (key) | |
951 | break; | |
952 | } | |
953 | } | |
954 | if (!key) { | |
955 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
956 | key = rcu_dereference(sdata->keys[i]); | |
957 | if (key) | |
958 | break; | |
959 | } | |
960 | } | |
961 | if (key) | |
962 | rx->key = key; | |
963 | } | |
0c7c10c7 | 964 | return RX_CONTINUE; |
571ecf67 | 965 | } else { |
39184b15 | 966 | u8 keyid; |
3017b80b JB |
967 | /* |
968 | * The device doesn't give us the IV so we won't be | |
969 | * able to look up the key. That's ok though, we | |
970 | * don't need to decrypt the frame, we just won't | |
971 | * be able to keep statistics accurate. | |
972 | * Except for key threshold notifications, should | |
973 | * we somehow allow the driver to tell us which key | |
974 | * the hardware used if this flag is set? | |
975 | */ | |
eb9fb5b8 JB |
976 | if ((status->flag & RX_FLAG_DECRYPTED) && |
977 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 978 | return RX_CONTINUE; |
3017b80b | 979 | |
761ab470 | 980 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
981 | |
982 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 983 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
984 | |
985 | /* | |
986 | * no need to call ieee80211_wep_get_keyidx, | |
987 | * it verifies a bunch of things we've done already | |
988 | */ | |
39184b15 ZY |
989 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
990 | keyidx = keyid >> 6; | |
3017b80b | 991 | |
e31b8213 JB |
992 | /* check per-station GTK first, if multicast packet */ |
993 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
994 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
3017b80b | 995 | |
e31b8213 JB |
996 | /* if not found, try default key */ |
997 | if (!rx->key) { | |
998 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
999 | ||
1000 | /* | |
1001 | * RSNA-protected unicast frames should always be | |
1002 | * sent with pairwise or station-to-station keys, | |
1003 | * but for WEP we allow using a key index as well. | |
1004 | */ | |
1005 | if (rx->key && | |
1006 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
1007 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1008 | !is_multicast_ether_addr(hdr->addr1)) | |
1009 | rx->key = NULL; | |
1010 | } | |
571ecf67 JB |
1011 | } |
1012 | ||
3017b80b | 1013 | if (rx->key) { |
571ecf67 | 1014 | rx->key->tx_rx_count++; |
011bfcc4 | 1015 | /* TODO: add threshold stuff again */ |
1990af8d | 1016 | } else { |
e4c26add | 1017 | return RX_DROP_MONITOR; |
70f08765 JB |
1018 | } |
1019 | ||
39184b15 ZY |
1020 | if (skb_linearize(rx->skb)) |
1021 | return RX_DROP_UNUSABLE; | |
761ab470 | 1022 | /* the hdr variable is invalid now! */ |
1990af8d | 1023 | |
97359d12 JB |
1024 | switch (rx->key->conf.cipher) { |
1025 | case WLAN_CIPHER_SUITE_WEP40: | |
1026 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
1027 | /* Check for weak IVs if possible */ |
1028 | if (rx->sta && ieee80211_is_data(fc) && | |
1029 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
1030 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1031 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
1032 | rx->sta->wep_weak_iv_count++; | |
1033 | ||
e2f036da MN |
1034 | result = ieee80211_crypto_wep_decrypt(rx); |
1035 | break; | |
97359d12 | 1036 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
1037 | result = ieee80211_crypto_tkip_decrypt(rx); |
1038 | break; | |
97359d12 | 1039 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1040 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1041 | break; | |
97359d12 | 1042 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1043 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1044 | break; | |
3ffc2a90 JB |
1045 | default: |
1046 | /* | |
1047 | * We can reach here only with HW-only algorithms | |
1048 | * but why didn't it decrypt the frame?! | |
1049 | */ | |
1050 | return RX_DROP_UNUSABLE; | |
70f08765 JB |
1051 | } |
1052 | ||
e2f036da | 1053 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1054 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1055 | |
1056 | return result; | |
70f08765 JB |
1057 | } |
1058 | ||
572e0012 KV |
1059 | static ieee80211_rx_result debug_noinline |
1060 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1061 | { | |
1062 | struct ieee80211_local *local; | |
1063 | struct ieee80211_hdr *hdr; | |
1064 | struct sk_buff *skb; | |
1065 | ||
1066 | local = rx->local; | |
1067 | skb = rx->skb; | |
1068 | hdr = (struct ieee80211_hdr *) skb->data; | |
1069 | ||
1070 | if (!local->pspolling) | |
1071 | return RX_CONTINUE; | |
1072 | ||
1073 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1074 | /* this is not from AP */ | |
1075 | return RX_CONTINUE; | |
1076 | ||
1077 | if (!ieee80211_is_data(hdr->frame_control)) | |
1078 | return RX_CONTINUE; | |
1079 | ||
1080 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1081 | /* AP has no more frames buffered for us */ | |
1082 | local->pspolling = false; | |
1083 | return RX_CONTINUE; | |
1084 | } | |
1085 | ||
1086 | /* more data bit is set, let's request a new frame from the AP */ | |
1087 | ieee80211_send_pspoll(local, rx->sdata); | |
1088 | ||
1089 | return RX_CONTINUE; | |
1090 | } | |
1091 | ||
133b8226 | 1092 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1093 | { |
133b8226 | 1094 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1095 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1096 | |
3e122be0 | 1097 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1098 | set_sta_flags(sta, WLAN_STA_PS_STA); |
d057e5a3 AN |
1099 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
1100 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 1101 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1102 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1103 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1104 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1105 | } | |
1106 | ||
ff9458d3 | 1107 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1108 | { |
133b8226 | 1109 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1110 | |
3e122be0 | 1111 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1112 | |
571ecf67 | 1113 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1114 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1115 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1116 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1117 | |
af818581 | 1118 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1119 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1120 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1121 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1122 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1123 | return; |
1124 | } | |
1125 | ||
1126 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1127 | } |
1128 | ||
d057e5a3 AN |
1129 | int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) |
1130 | { | |
1131 | struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); | |
1132 | bool in_ps; | |
1133 | ||
1134 | WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); | |
1135 | ||
1136 | /* Don't let the same PS state be set twice */ | |
1137 | in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA); | |
1138 | if ((start && in_ps) || (!start && !in_ps)) | |
1139 | return -EINVAL; | |
1140 | ||
1141 | if (start) | |
1142 | ap_sta_ps_start(sta_inf); | |
1143 | else | |
1144 | ap_sta_ps_end(sta_inf); | |
1145 | ||
1146 | return 0; | |
1147 | } | |
1148 | EXPORT_SYMBOL(ieee80211_sta_ps_transition); | |
1149 | ||
49461622 | 1150 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1151 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1152 | { |
1153 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1154 | struct sk_buff *skb = rx->skb; |
1155 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1156 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1157 | |
1158 | if (!sta) | |
9ae54c84 | 1159 | return RX_CONTINUE; |
571ecf67 | 1160 | |
b291ba11 JB |
1161 | /* |
1162 | * Update last_rx only for IBSS packets which are for the current | |
1163 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1164 | * where other STAs start using different BSSID. | |
1165 | */ | |
05c914fe | 1166 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1167 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1168 | NL80211_IFTYPE_ADHOC); |
46900298 | 1169 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1170 | sta->last_rx = jiffies; |
b291ba11 JB |
1171 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1172 | /* | |
33b64eb2 LCC |
1173 | * Mesh beacons will update last_rx when if they are found to |
1174 | * match the current local configuration when processed. | |
571ecf67 | 1175 | */ |
b291ba11 | 1176 | sta->last_rx = jiffies; |
571ecf67 JB |
1177 | } |
1178 | ||
554891e6 | 1179 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1180 | return RX_CONTINUE; |
571ecf67 | 1181 | |
3cf335d5 KV |
1182 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1183 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1184 | ||
571ecf67 JB |
1185 | sta->rx_fragments++; |
1186 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1187 | sta->last_signal = status->signal; |
541a45a1 | 1188 | ewma_add(&sta->avg_signal, -status->signal); |
571ecf67 | 1189 | |
72eaa43a JB |
1190 | /* |
1191 | * Change STA power saving mode only at the end of a frame | |
1192 | * exchange sequence. | |
1193 | */ | |
d057e5a3 AN |
1194 | if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && |
1195 | !ieee80211_has_morefrags(hdr->frame_control) && | |
4cfda47b | 1196 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
05c914fe JB |
1197 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1198 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1199 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1200 | /* |
1201 | * Ignore doze->wake transitions that are | |
1202 | * indicated by non-data frames, the standard | |
1203 | * is unclear here, but for example going to | |
1204 | * PS mode and then scanning would cause a | |
1205 | * doze->wake transition for the probe request, | |
1206 | * and that is clearly undesirable. | |
1207 | */ | |
1208 | if (ieee80211_is_data(hdr->frame_control) && | |
1209 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1210 | ap_sta_ps_end(sta); |
72eaa43a JB |
1211 | } else { |
1212 | if (ieee80211_has_pm(hdr->frame_control)) | |
1213 | ap_sta_ps_start(sta); | |
1214 | } | |
571ecf67 JB |
1215 | } |
1216 | ||
22403def JB |
1217 | /* |
1218 | * Drop (qos-)data::nullfunc frames silently, since they | |
1219 | * are used only to control station power saving mode. | |
1220 | */ | |
1221 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1222 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1223 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1224 | |
1225 | /* | |
1226 | * If we receive a 4-addr nullfunc frame from a STA | |
1227 | * that was not moved to a 4-addr STA vlan yet, drop | |
1228 | * the frame to the monitor interface, to make sure | |
1229 | * that hostapd sees it | |
1230 | */ | |
1231 | if (ieee80211_has_a4(hdr->frame_control) && | |
1232 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1233 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1234 | !rx->sdata->u.vlan.sta))) | |
1235 | return RX_DROP_MONITOR; | |
22403def JB |
1236 | /* |
1237 | * Update counter and free packet here to avoid | |
1238 | * counting this as a dropped packed. | |
1239 | */ | |
571ecf67 JB |
1240 | sta->rx_packets++; |
1241 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1242 | return RX_QUEUED; |
571ecf67 JB |
1243 | } |
1244 | ||
9ae54c84 | 1245 | return RX_CONTINUE; |
571ecf67 JB |
1246 | } /* ieee80211_rx_h_sta_process */ |
1247 | ||
571ecf67 JB |
1248 | static inline struct ieee80211_fragment_entry * |
1249 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1250 | unsigned int frag, unsigned int seq, int rx_queue, | |
1251 | struct sk_buff **skb) | |
1252 | { | |
1253 | struct ieee80211_fragment_entry *entry; | |
1254 | int idx; | |
1255 | ||
1256 | idx = sdata->fragment_next; | |
1257 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1258 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1259 | sdata->fragment_next = 0; | |
1260 | ||
1261 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1262 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1263 | struct ieee80211_hdr *hdr = |
1264 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1265 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1266 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1267 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1268 | sdata->name, idx, |
571ecf67 | 1269 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1270 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1271 | #endif |
571ecf67 JB |
1272 | __skb_queue_purge(&entry->skb_list); |
1273 | } | |
1274 | ||
1275 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1276 | *skb = NULL; | |
1277 | entry->first_frag_time = jiffies; | |
1278 | entry->seq = seq; | |
1279 | entry->rx_queue = rx_queue; | |
1280 | entry->last_frag = frag; | |
1281 | entry->ccmp = 0; | |
1282 | entry->extra_len = 0; | |
1283 | ||
1284 | return entry; | |
1285 | } | |
1286 | ||
1287 | static inline struct ieee80211_fragment_entry * | |
1288 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1289 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1290 | int rx_queue, struct ieee80211_hdr *hdr) |
1291 | { | |
1292 | struct ieee80211_fragment_entry *entry; | |
1293 | int i, idx; | |
1294 | ||
1295 | idx = sdata->fragment_next; | |
1296 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1297 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1298 | |
1299 | idx--; | |
1300 | if (idx < 0) | |
1301 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1302 | ||
1303 | entry = &sdata->fragments[idx]; | |
1304 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1305 | entry->rx_queue != rx_queue || | |
1306 | entry->last_frag + 1 != frag) | |
1307 | continue; | |
1308 | ||
b73d70ad | 1309 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1310 | |
b73d70ad HH |
1311 | /* |
1312 | * Check ftype and addresses are equal, else check next fragment | |
1313 | */ | |
1314 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1315 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1316 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1317 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1318 | continue; | |
1319 | ||
ab46623e | 1320 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1321 | __skb_queue_purge(&entry->skb_list); |
1322 | continue; | |
1323 | } | |
1324 | return entry; | |
1325 | } | |
1326 | ||
1327 | return NULL; | |
1328 | } | |
1329 | ||
49461622 | 1330 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1331 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1332 | { |
1333 | struct ieee80211_hdr *hdr; | |
1334 | u16 sc; | |
358c8d9d | 1335 | __le16 fc; |
571ecf67 JB |
1336 | unsigned int frag, seq; |
1337 | struct ieee80211_fragment_entry *entry; | |
1338 | struct sk_buff *skb; | |
554891e6 | 1339 | struct ieee80211_rx_status *status; |
571ecf67 | 1340 | |
b73d70ad | 1341 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1342 | fc = hdr->frame_control; |
571ecf67 JB |
1343 | sc = le16_to_cpu(hdr->seq_ctrl); |
1344 | frag = sc & IEEE80211_SCTL_FRAG; | |
1345 | ||
358c8d9d | 1346 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1347 | (rx->skb)->len < 24 || |
1348 | is_multicast_ether_addr(hdr->addr1))) { | |
1349 | /* not fragmented */ | |
1350 | goto out; | |
1351 | } | |
1352 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1353 | ||
e3cf8b3f ZY |
1354 | if (skb_linearize(rx->skb)) |
1355 | return RX_DROP_UNUSABLE; | |
1356 | ||
058897a4 AK |
1357 | /* |
1358 | * skb_linearize() might change the skb->data and | |
1359 | * previously cached variables (in this case, hdr) need to | |
1360 | * be refreshed with the new data. | |
1361 | */ | |
1362 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1363 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1364 | ||
1365 | if (frag == 0) { | |
1366 | /* This is the first fragment of a new frame. */ | |
1367 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1368 | rx->queue, &(rx->skb)); |
97359d12 | 1369 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1370 | ieee80211_has_protected(fc)) { |
9190252c JM |
1371 | int queue = ieee80211_is_mgmt(fc) ? |
1372 | NUM_RX_DATA_QUEUES : rx->queue; | |
571ecf67 JB |
1373 | /* Store CCMP PN so that we can verify that the next |
1374 | * fragment has a sequential PN value. */ | |
1375 | entry->ccmp = 1; | |
1376 | memcpy(entry->last_pn, | |
9190252c | 1377 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1378 | CCMP_PN_LEN); |
1379 | } | |
9ae54c84 | 1380 | return RX_QUEUED; |
571ecf67 JB |
1381 | } |
1382 | ||
1383 | /* This is a fragment for a frame that should already be pending in | |
1384 | * fragment cache. Add this fragment to the end of the pending entry. | |
1385 | */ | |
b73d70ad | 1386 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1387 | if (!entry) { |
1388 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1389 | return RX_DROP_MONITOR; |
571ecf67 JB |
1390 | } |
1391 | ||
1392 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1393 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1394 | if (entry->ccmp) { | |
1395 | int i; | |
1396 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1397 | int queue; |
97359d12 | 1398 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1399 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1400 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1401 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1402 | pn[i]++; | |
1403 | if (pn[i]) | |
1404 | break; | |
1405 | } | |
9190252c JM |
1406 | queue = ieee80211_is_mgmt(fc) ? |
1407 | NUM_RX_DATA_QUEUES : rx->queue; | |
1408 | rpn = rx->key->u.ccmp.rx_pn[queue]; | |
f4ea83dd | 1409 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1410 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1411 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1412 | } | |
1413 | ||
358c8d9d | 1414 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1415 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1416 | entry->last_frag = frag; | |
1417 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1418 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1419 | rx->skb = NULL; |
9ae54c84 | 1420 | return RX_QUEUED; |
571ecf67 JB |
1421 | } |
1422 | ||
1423 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1424 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1425 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1426 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1427 | GFP_ATOMIC))) { | |
1428 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1429 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1430 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1431 | } |
1432 | } | |
1433 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1434 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1435 | dev_kfree_skb(skb); | |
1436 | } | |
1437 | ||
1438 | /* Complete frame has been reassembled - process it now */ | |
554891e6 JB |
1439 | status = IEEE80211_SKB_RXCB(rx->skb); |
1440 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
571ecf67 JB |
1441 | |
1442 | out: | |
1443 | if (rx->sta) | |
1444 | rx->sta->rx_packets++; | |
1445 | if (is_multicast_ether_addr(hdr->addr1)) | |
1446 | rx->local->dot11MulticastReceivedFrameCount++; | |
1447 | else | |
1448 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1449 | return RX_CONTINUE; |
571ecf67 JB |
1450 | } |
1451 | ||
49461622 | 1452 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1453 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1454 | { |
af818581 | 1455 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1456 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
554891e6 | 1457 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1458 | |
358c8d9d | 1459 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
554891e6 | 1460 | !(status->rx_flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1461 | return RX_CONTINUE; |
571ecf67 | 1462 | |
05c914fe JB |
1463 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1464 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1465 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1466 | |
af818581 JB |
1467 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1468 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1469 | else | |
1470 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1471 | |
9ae54c84 | 1472 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1473 | * count as an dropped frame. */ |
1474 | dev_kfree_skb(rx->skb); | |
1475 | ||
9ae54c84 | 1476 | return RX_QUEUED; |
571ecf67 JB |
1477 | } |
1478 | ||
49461622 | 1479 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1480 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1481 | { |
6e0d114d | 1482 | u8 *data = rx->skb->data; |
238f74a2 | 1483 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1484 | |
238f74a2 | 1485 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1486 | return RX_CONTINUE; |
6e0d114d JB |
1487 | |
1488 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1489 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1490 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1491 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1492 | /* change frame type to non QOS */ |
238f74a2 | 1493 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1494 | |
9ae54c84 | 1495 | return RX_CONTINUE; |
6e0d114d JB |
1496 | } |
1497 | ||
76ee65bf | 1498 | static int |
5cf121c3 | 1499 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1500 | { |
07346f81 | 1501 | if (unlikely(!rx->sta || |
f4ea83dd | 1502 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1503 | return -EACCES; |
571ecf67 | 1504 | |
76ee65bf | 1505 | return 0; |
571ecf67 JB |
1506 | } |
1507 | ||
76ee65bf | 1508 | static int |
358c8d9d | 1509 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1510 | { |
eb9fb5b8 JB |
1511 | struct sk_buff *skb = rx->skb; |
1512 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1513 | ||
3017b80b | 1514 | /* |
7848ba7d JB |
1515 | * Pass through unencrypted frames if the hardware has |
1516 | * decrypted them already. | |
3017b80b | 1517 | */ |
eb9fb5b8 | 1518 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1519 | return 0; |
571ecf67 JB |
1520 | |
1521 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1522 | if (unlikely(!ieee80211_has_protected(fc) && |
1523 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1524 | ieee80211_is_data(fc) && |
b3fc9c6c | 1525 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1526 | return -EACCES; |
bef5d1c7 JB |
1527 | |
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | static int | |
1532 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1533 | { | |
1534 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1535 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1536 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1537 | |
e3efca0a JM |
1538 | /* |
1539 | * Pass through unencrypted frames if the hardware has | |
1540 | * decrypted them already. | |
1541 | */ | |
1542 | if (status->flag & RX_FLAG_DECRYPTED) | |
1543 | return 0; | |
bef5d1c7 | 1544 | |
f2ca3ea4 | 1545 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1546 | if (unlikely(!ieee80211_has_protected(fc) && |
1547 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
cf4e594e JM |
1548 | rx->key)) { |
1549 | if (ieee80211_is_deauth(fc)) | |
1550 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1551 | rx->skb->data, | |
1552 | rx->skb->len); | |
1553 | else if (ieee80211_is_disassoc(fc)) | |
1554 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1555 | rx->skb->data, | |
1556 | rx->skb->len); | |
f2ca3ea4 | 1557 | return -EACCES; |
cf4e594e | 1558 | } |
f2ca3ea4 | 1559 | /* BIP does not use Protected field, so need to check MMIE */ |
f64f9e71 | 1560 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
cf4e594e JM |
1561 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
1562 | if (ieee80211_is_deauth(fc)) | |
1563 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1564 | rx->skb->data, | |
1565 | rx->skb->len); | |
1566 | else if (ieee80211_is_disassoc(fc)) | |
1567 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1568 | rx->skb->data, | |
1569 | rx->skb->len); | |
f2ca3ea4 | 1570 | return -EACCES; |
cf4e594e | 1571 | } |
f2ca3ea4 JM |
1572 | /* |
1573 | * When using MFP, Action frames are not allowed prior to | |
1574 | * having configured keys. | |
1575 | */ | |
1576 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1577 | ieee80211_is_robust_mgmt_frame( | |
1578 | (struct ieee80211_hdr *) rx->skb->data))) | |
1579 | return -EACCES; | |
1580 | } | |
b3fc9c6c | 1581 | |
76ee65bf | 1582 | return 0; |
571ecf67 JB |
1583 | } |
1584 | ||
76ee65bf | 1585 | static int |
e31a16d6 | 1586 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1587 | { |
eb9fb5b8 | 1588 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee | 1589 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
fbb327c5 FF |
1590 | bool check_port_control = false; |
1591 | struct ethhdr *ehdr; | |
1592 | int ret; | |
f14543ee | 1593 | |
9bc383de JB |
1594 | if (ieee80211_has_a4(hdr->frame_control) && |
1595 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1596 | return -1; |
9bc383de | 1597 | |
fbb327c5 FF |
1598 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
1599 | !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { | |
1600 | ||
1601 | if (!sdata->u.mgd.use_4addr) | |
1602 | return -1; | |
1603 | else | |
1604 | check_port_control = true; | |
1605 | } | |
1606 | ||
9bc383de | 1607 | if (is_multicast_ether_addr(hdr->addr1) && |
fbb327c5 | 1608 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) |
f14543ee | 1609 | return -1; |
571ecf67 | 1610 | |
fbb327c5 FF |
1611 | ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
1612 | if (ret < 0 || !check_port_control) | |
1613 | return ret; | |
1614 | ||
1615 | ehdr = (struct ethhdr *) rx->skb->data; | |
1616 | if (ehdr->h_proto != rx->sdata->control_port_protocol) | |
1617 | return -1; | |
1618 | ||
1619 | return 0; | |
76ee65bf | 1620 | } |
571ecf67 | 1621 | |
ce3edf6d JB |
1622 | /* |
1623 | * requires that rx->skb is a frame with ethernet header | |
1624 | */ | |
358c8d9d | 1625 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1626 | { |
c97c23e3 | 1627 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1628 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1629 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1630 | ||
1631 | /* | |
1632 | * Allow EAPOL frames to us/the PAE group address regardless | |
1633 | * of whether the frame was encrypted or not. | |
1634 | */ | |
a621fa4d | 1635 | if (ehdr->h_proto == rx->sdata->control_port_protocol && |
47846c9b | 1636 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1637 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1638 | return true; | |
1639 | ||
1640 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1641 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1642 | return false; |
1643 | ||
1644 | return true; | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * requires that rx->skb is a frame with ethernet header | |
1649 | */ | |
76ee65bf | 1650 | static void |
5cf121c3 | 1651 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1652 | { |
eb9fb5b8 JB |
1653 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1654 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1655 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1656 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1657 | struct sta_info *dsta; | |
554891e6 | 1658 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1659 | |
76ee65bf RR |
1660 | skb = rx->skb; |
1661 | xmit_skb = NULL; | |
571ecf67 | 1662 | |
05c914fe JB |
1663 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1664 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1665 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
554891e6 | 1666 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
9bc383de | 1667 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
ce3edf6d JB |
1668 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1669 | /* | |
1670 | * send multicast frames both to higher layers in | |
1671 | * local net stack and back to the wireless medium | |
1672 | */ | |
76ee65bf RR |
1673 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1674 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1675 | printk(KERN_DEBUG "%s: failed to clone " |
1676 | "multicast frame\n", dev->name); | |
1677 | } else { | |
abe60632 JB |
1678 | dsta = sta_info_get(sdata, skb->data); |
1679 | if (dsta) { | |
ce3edf6d JB |
1680 | /* |
1681 | * The destination station is associated to | |
1682 | * this AP (in this VLAN), so send the frame | |
1683 | * directly to it and do not pass it to local | |
1684 | * net stack. | |
571ecf67 | 1685 | */ |
76ee65bf | 1686 | xmit_skb = skb; |
571ecf67 JB |
1687 | skb = NULL; |
1688 | } | |
571ecf67 JB |
1689 | } |
1690 | } | |
1691 | ||
1692 | if (skb) { | |
d1c3a37c JB |
1693 | int align __maybe_unused; |
1694 | ||
59d9cb07 | 1695 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1696 | /* |
1697 | * 'align' will only take the values 0 or 2 here | |
1698 | * since all frames are required to be aligned | |
1699 | * to 2-byte boundaries when being passed to | |
1700 | * mac80211. That also explains the __skb_push() | |
1701 | * below. | |
1702 | */ | |
dacb6f1d | 1703 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1704 | if (align) { |
1705 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1706 | dev_kfree_skb(skb); | |
1707 | skb = NULL; | |
1708 | } else { | |
1709 | u8 *data = skb->data; | |
8ce0b589 ZY |
1710 | size_t len = skb_headlen(skb); |
1711 | skb->data -= align; | |
1712 | memmove(skb->data, data, len); | |
1713 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1714 | } |
1715 | } | |
1716 | #endif | |
1717 | ||
1718 | if (skb) { | |
1719 | /* deliver to local stack */ | |
1720 | skb->protocol = eth_type_trans(skb, dev); | |
1721 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1722 | netif_receive_skb(skb); |
d1c3a37c | 1723 | } |
571ecf67 JB |
1724 | } |
1725 | ||
76ee65bf | 1726 | if (xmit_skb) { |
571ecf67 | 1727 | /* send to wireless media */ |
f831e909 | 1728 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1729 | skb_reset_network_header(xmit_skb); |
1730 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1731 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1732 | } |
76ee65bf RR |
1733 | } |
1734 | ||
49461622 | 1735 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1736 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1737 | { |
eb9fb5b8 | 1738 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1739 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1740 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1741 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1742 | struct sk_buff_head frame_list; |
554891e6 | 1743 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
fd4c7f2f | 1744 | |
358c8d9d | 1745 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1746 | return RX_CONTINUE; |
fd4c7f2f | 1747 | |
358c8d9d | 1748 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1749 | return RX_DROP_MONITOR; |
fd4c7f2f | 1750 | |
554891e6 | 1751 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1752 | return RX_CONTINUE; |
fd4c7f2f | 1753 | |
eaf85ca7 ZY |
1754 | if (ieee80211_has_a4(hdr->frame_control) && |
1755 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1756 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1757 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1758 | |
eaf85ca7 ZY |
1759 | if (is_multicast_ether_addr(hdr->addr1) && |
1760 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1761 | rx->sdata->u.vlan.sta) || | |
1762 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1763 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1764 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1765 | |
eaf85ca7 ZY |
1766 | skb->dev = dev; |
1767 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1768 | |
e3cf8b3f ZY |
1769 | if (skb_linearize(skb)) |
1770 | return RX_DROP_UNUSABLE; | |
1771 | ||
eaf85ca7 ZY |
1772 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1773 | rx->sdata->vif.type, | |
1774 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1775 | |
eaf85ca7 ZY |
1776 | while (!skb_queue_empty(&frame_list)) { |
1777 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1778 | |
358c8d9d | 1779 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1780 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1781 | continue; |
1782 | } | |
eaf85ca7 ZY |
1783 | dev->stats.rx_packets++; |
1784 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1785 | |
1786 | ieee80211_deliver_skb(rx); | |
1787 | } | |
1788 | ||
9ae54c84 | 1789 | return RX_QUEUED; |
fd4c7f2f RR |
1790 | } |
1791 | ||
bf94e17b | 1792 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1793 | static ieee80211_rx_result |
e32f85f7 LCC |
1794 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1795 | { | |
1796 | struct ieee80211_hdr *hdr; | |
1797 | struct ieee80211s_hdr *mesh_hdr; | |
1798 | unsigned int hdrlen; | |
1799 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1800 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1801 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
554891e6 | 1802 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
e32f85f7 LCC |
1803 | |
1804 | hdr = (struct ieee80211_hdr *) skb->data; | |
1805 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1806 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1807 | ||
1808 | if (!ieee80211_is_data(hdr->frame_control)) | |
1809 | return RX_CONTINUE; | |
1810 | ||
1811 | if (!mesh_hdr->ttl) | |
1812 | /* illegal frame */ | |
1813 | return RX_DROP_MONITOR; | |
1814 | ||
43b7b314 | 1815 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1816 | struct mesh_path *mppath; |
43b7b314 JC |
1817 | char *proxied_addr; |
1818 | char *mpp_addr; | |
1819 | ||
1820 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1821 | mpp_addr = hdr->addr3; | |
1822 | proxied_addr = mesh_hdr->eaddr1; | |
1823 | } else { | |
1824 | mpp_addr = hdr->addr4; | |
1825 | proxied_addr = mesh_hdr->eaddr2; | |
1826 | } | |
79617dee | 1827 | |
79617dee | 1828 | rcu_read_lock(); |
43b7b314 | 1829 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1830 | if (!mppath) { |
43b7b314 | 1831 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1832 | } else { |
1833 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1834 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1835 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1836 | spin_unlock_bh(&mppath->state_lock); |
1837 | } | |
1838 | rcu_read_unlock(); | |
1839 | } | |
1840 | ||
3c5772a5 JC |
1841 | /* Frame has reached destination. Don't forward */ |
1842 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1843 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1844 | return RX_CONTINUE; |
1845 | ||
1846 | mesh_hdr->ttl--; | |
1847 | ||
554891e6 | 1848 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
e32f85f7 | 1849 | if (!mesh_hdr->ttl) |
472dbc45 | 1850 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1851 | dropped_frames_ttl); |
1852 | else { | |
1853 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1854 | struct ieee80211_tx_info *info; |
1855 | ||
e32f85f7 LCC |
1856 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1857 | ||
1858 | if (!fwd_skb && net_ratelimit()) | |
1859 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1860 | sdata->name); |
919bbad5 | 1861 | if (!fwd_skb) |
b51aff05 | 1862 | goto out; |
e32f85f7 LCC |
1863 | |
1864 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1865 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1866 | info = IEEE80211_SKB_CB(fwd_skb); |
1867 | memset(info, 0, sizeof(*info)); | |
1868 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1869 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1870 | skb_set_queue_mapping(skb, |
1871 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1872 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1873 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1874 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1875 | fwded_mcast); | |
1876 | else { | |
3c5772a5 JC |
1877 | int err; |
1878 | /* | |
1879 | * Save TA to addr1 to send TA a path error if a | |
1880 | * suitable next hop is not found | |
1881 | */ | |
1882 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1883 | ETH_ALEN); |
3c5772a5 | 1884 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1885 | /* Failed to immediately resolve next hop: |
1886 | * fwded frame was dropped or will be added | |
1887 | * later to the pending skb queue. */ | |
1888 | if (err) | |
1889 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1890 | |
1891 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1892 | fwded_unicast); | |
249b405c JC |
1893 | } |
1894 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1895 | fwded_frames); | |
3b8d81e0 | 1896 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1897 | } |
1898 | } | |
1899 | ||
b51aff05 | 1900 | out: |
3c5772a5 | 1901 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1902 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1903 | return RX_CONTINUE; |
1904 | else | |
1905 | return RX_DROP_MONITOR; | |
1906 | } | |
bf94e17b | 1907 | #endif |
e32f85f7 | 1908 | |
49461622 | 1909 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1910 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1911 | { |
eb9fb5b8 | 1912 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1913 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1914 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1915 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1916 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1917 | int err; |
76ee65bf | 1918 | |
358c8d9d | 1919 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1920 | return RX_CONTINUE; |
76ee65bf | 1921 | |
358c8d9d | 1922 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1923 | return RX_DROP_MONITOR; |
76ee65bf | 1924 | |
f14543ee FF |
1925 | /* |
1926 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1927 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1928 | */ | |
1929 | if (ieee80211_has_a4(hdr->frame_control) && | |
1930 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1931 | return RX_DROP_MONITOR; | |
1932 | ||
e31a16d6 | 1933 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1934 | if (unlikely(err)) |
e4c26add | 1935 | return RX_DROP_UNUSABLE; |
76ee65bf | 1936 | |
358c8d9d | 1937 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1938 | return RX_DROP_MONITOR; |
ce3edf6d | 1939 | |
76ee65bf RR |
1940 | rx->skb->dev = dev; |
1941 | ||
1942 | dev->stats.rx_packets++; | |
1943 | dev->stats.rx_bytes += rx->skb->len; | |
1944 | ||
08ca944e | 1945 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
8c99f691 RM |
1946 | !is_multicast_ether_addr( |
1947 | ((struct ethhdr *)rx->skb->data)->h_dest) && | |
1948 | (!local->scanning && | |
1949 | !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { | |
e15276a4 VN |
1950 | mod_timer(&local->dynamic_ps_timer, jiffies + |
1951 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1952 | } | |
1953 | ||
76ee65bf | 1954 | ieee80211_deliver_skb(rx); |
571ecf67 | 1955 | |
9ae54c84 | 1956 | return RX_QUEUED; |
571ecf67 JB |
1957 | } |
1958 | ||
49461622 | 1959 | static ieee80211_rx_result debug_noinline |
24a8fdad | 1960 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1961 | { |
1962 | struct ieee80211_local *local = rx->local; | |
1963 | struct ieee80211_hw *hw = &local->hw; | |
1964 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1965 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1966 | struct tid_ampdu_rx *tid_agg_rx; |
1967 | u16 start_seq_num; | |
1968 | u16 tid; | |
1969 | ||
a7767f95 | 1970 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1971 | return RX_CONTINUE; |
71364716 | 1972 | |
a7767f95 | 1973 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
1974 | struct { |
1975 | __le16 control, start_seq_num; | |
1976 | } __packed bar_data; | |
1977 | ||
71364716 | 1978 | if (!rx->sta) |
a02ae758 | 1979 | return RX_DROP_MONITOR; |
8ae5977f JB |
1980 | |
1981 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
1982 | &bar_data, sizeof(bar_data))) | |
1983 | return RX_DROP_MONITOR; | |
1984 | ||
8ae5977f | 1985 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
1986 | |
1987 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
1988 | if (!tid_agg_rx) | |
a02ae758 | 1989 | return RX_DROP_MONITOR; |
71364716 | 1990 | |
8ae5977f | 1991 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
1992 | |
1993 | /* reset session timer */ | |
20ad19d0 JB |
1994 | if (tid_agg_rx->timeout) |
1995 | mod_timer(&tid_agg_rx->session_timer, | |
1996 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1997 | |
dd318575 | 1998 | spin_lock(&tid_agg_rx->reorder_lock); |
a02ae758 | 1999 | /* release stored frames up to start of BAR */ |
24a8fdad | 2000 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); |
dd318575 JB |
2001 | spin_unlock(&tid_agg_rx->reorder_lock); |
2002 | ||
a02ae758 JB |
2003 | kfree_skb(skb); |
2004 | return RX_QUEUED; | |
71364716 RR |
2005 | } |
2006 | ||
08daecae JB |
2007 | /* |
2008 | * After this point, we only want management frames, | |
2009 | * so we can drop all remaining control frames to | |
2010 | * cooked monitor interfaces. | |
2011 | */ | |
2012 | return RX_DROP_MONITOR; | |
71364716 RR |
2013 | } |
2014 | ||
f4f727a6 JM |
2015 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
2016 | struct ieee80211_mgmt *mgmt, | |
2017 | size_t len) | |
fea14732 JM |
2018 | { |
2019 | struct ieee80211_local *local = sdata->local; | |
2020 | struct sk_buff *skb; | |
2021 | struct ieee80211_mgmt *resp; | |
2022 | ||
47846c9b | 2023 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
2024 | /* Not to own unicast address */ |
2025 | return; | |
2026 | } | |
2027 | ||
46900298 JB |
2028 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
2029 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 2030 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
2031 | return; |
2032 | } | |
2033 | ||
2034 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2035 | /* Too short SA Query request frame */ | |
2036 | return; | |
2037 | } | |
2038 | ||
2039 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2040 | if (skb == NULL) | |
2041 | return; | |
2042 | ||
2043 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2044 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2045 | memset(resp, 0, 24); | |
2046 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 2047 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 2048 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
2049 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2050 | IEEE80211_STYPE_ACTION); | |
2051 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2052 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2053 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2054 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2055 | mgmt->u.action.u.sa_query.trans_id, | |
2056 | WLAN_SA_QUERY_TR_ID_LEN); | |
2057 | ||
62ae67be | 2058 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
2059 | } |
2060 | ||
2e161f78 JB |
2061 | static ieee80211_rx_result debug_noinline |
2062 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2063 | { | |
2064 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
554891e6 | 2065 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2066 | |
2067 | /* | |
2068 | * From here on, look only at management frames. | |
2069 | * Data and control frames are already handled, | |
2070 | * and unknown (reserved) frames are useless. | |
2071 | */ | |
2072 | if (rx->skb->len < 24) | |
2073 | return RX_DROP_MONITOR; | |
2074 | ||
2075 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2076 | return RX_DROP_MONITOR; | |
2077 | ||
554891e6 | 2078 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
2e161f78 JB |
2079 | return RX_DROP_MONITOR; |
2080 | ||
2081 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2082 | return RX_DROP_UNUSABLE; | |
2083 | ||
2084 | return RX_CONTINUE; | |
2085 | } | |
2086 | ||
de1ede7a JB |
2087 | static ieee80211_rx_result debug_noinline |
2088 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2089 | { | |
2090 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 2091 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 2092 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
554891e6 | 2093 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
de1ede7a JB |
2094 | int len = rx->skb->len; |
2095 | ||
2096 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2097 | return RX_CONTINUE; | |
2098 | ||
026331c4 JM |
2099 | /* drop too small frames */ |
2100 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 2101 | return RX_DROP_UNUSABLE; |
de1ede7a | 2102 | |
026331c4 | 2103 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 2104 | return RX_DROP_UNUSABLE; |
de1ede7a | 2105 | |
554891e6 | 2106 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 2107 | return RX_DROP_UNUSABLE; |
97ebe12a | 2108 | |
de1ede7a JB |
2109 | switch (mgmt->u.action.category) { |
2110 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
2111 | /* |
2112 | * The aggregation code is not prepared to handle | |
2113 | * anything but STA/AP due to the BSSID handling; | |
2114 | * IBSS could work in the code but isn't supported | |
2115 | * by drivers or the standard. | |
2116 | */ | |
2117 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2118 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2119 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 2120 | break; |
8abd3f9b | 2121 | |
026331c4 JM |
2122 | /* verify action_code is present */ |
2123 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2124 | break; | |
2125 | ||
de1ede7a JB |
2126 | switch (mgmt->u.action.u.addba_req.action_code) { |
2127 | case WLAN_ACTION_ADDBA_REQ: | |
2128 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2129 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
2130 | goto invalid; |
2131 | break; | |
de1ede7a JB |
2132 | case WLAN_ACTION_ADDBA_RESP: |
2133 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2134 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
2135 | goto invalid; |
2136 | break; | |
de1ede7a JB |
2137 | case WLAN_ACTION_DELBA: |
2138 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2139 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
2140 | goto invalid; |
2141 | break; | |
2142 | default: | |
2143 | goto invalid; | |
de1ede7a | 2144 | } |
bed7ee6e | 2145 | |
8b58ff83 | 2146 | goto queue; |
39192c0b JB |
2147 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2148 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2149 | break; |
46900298 JB |
2150 | |
2151 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2152 | break; |
46900298 | 2153 | |
026331c4 JM |
2154 | /* verify action_code is present */ |
2155 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2156 | break; | |
2157 | ||
39192c0b JB |
2158 | switch (mgmt->u.action.u.measurement.action_code) { |
2159 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2160 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2161 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2162 | break; |
39192c0b | 2163 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2164 | goto handled; |
c481ec97 S |
2165 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2166 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2167 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2168 | break; |
c481ec97 | 2169 | |
cc32abd4 | 2170 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2171 | break; |
cc32abd4 | 2172 | |
46900298 | 2173 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2174 | break; |
c481ec97 | 2175 | |
8b58ff83 | 2176 | goto queue; |
39192c0b JB |
2177 | } |
2178 | break; | |
fea14732 JM |
2179 | case WLAN_CATEGORY_SA_QUERY: |
2180 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2181 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2182 | break; |
2183 | ||
fea14732 JM |
2184 | switch (mgmt->u.action.u.sa_query.action) { |
2185 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2186 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2187 | break; |
fea14732 | 2188 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2189 | goto handled; |
fea14732 JM |
2190 | } |
2191 | break; | |
97ad9139 | 2192 | case WLAN_CATEGORY_MESH_PLINK: |
77a121c3 JB |
2193 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2194 | break; | |
8b58ff83 | 2195 | goto queue; |
c7108a71 JC |
2196 | case WLAN_CATEGORY_MESH_PATH_SEL: |
2197 | if (!mesh_path_sel_is_hwmp(sdata)) | |
2198 | break; | |
2199 | goto queue; | |
84040805 | 2200 | } |
026331c4 | 2201 | |
2e161f78 JB |
2202 | return RX_CONTINUE; |
2203 | ||
bed7ee6e | 2204 | invalid: |
554891e6 | 2205 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
2e161f78 JB |
2206 | /* will return in the next handlers */ |
2207 | return RX_CONTINUE; | |
2208 | ||
2209 | handled: | |
2210 | if (rx->sta) | |
2211 | rx->sta->rx_packets++; | |
2212 | dev_kfree_skb(rx->skb); | |
2213 | return RX_QUEUED; | |
2214 | ||
2215 | queue: | |
2216 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2217 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2218 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2219 | if (rx->sta) | |
2220 | rx->sta->rx_packets++; | |
2221 | return RX_QUEUED; | |
2222 | } | |
2223 | ||
2224 | static ieee80211_rx_result debug_noinline | |
2225 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2226 | { | |
554891e6 | 2227 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2228 | |
2229 | /* skip known-bad action frames and return them in the next handler */ | |
554891e6 | 2230 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
2e161f78 | 2231 | return RX_CONTINUE; |
d7907448 | 2232 | |
026331c4 JM |
2233 | /* |
2234 | * Getting here means the kernel doesn't know how to handle | |
2235 | * it, but maybe userspace does ... include returned frames | |
2236 | * so userspace can register for those to know whether ones | |
2237 | * it transmitted were processed or returned. | |
2238 | */ | |
026331c4 | 2239 | |
2e161f78 JB |
2240 | if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, |
2241 | rx->skb->data, rx->skb->len, | |
2242 | GFP_ATOMIC)) { | |
2243 | if (rx->sta) | |
2244 | rx->sta->rx_packets++; | |
2245 | dev_kfree_skb(rx->skb); | |
2246 | return RX_QUEUED; | |
2247 | } | |
2248 | ||
2249 | ||
2250 | return RX_CONTINUE; | |
2251 | } | |
2252 | ||
2253 | static ieee80211_rx_result debug_noinline | |
2254 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2255 | { | |
2256 | struct ieee80211_local *local = rx->local; | |
2257 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2258 | struct sk_buff *nskb; | |
2259 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
554891e6 | 2260 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2261 | |
2262 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2263 | return RX_CONTINUE; | |
2264 | ||
2265 | /* | |
2266 | * For AP mode, hostapd is responsible for handling any action | |
2267 | * frames that we didn't handle, including returning unknown | |
2268 | * ones. For all other modes we will return them to the sender, | |
2269 | * setting the 0x80 bit in the action category, as required by | |
2270 | * 802.11-2007 7.3.1.11. | |
2271 | * Newer versions of hostapd shall also use the management frame | |
2272 | * registration mechanisms, but older ones still use cooked | |
2273 | * monitor interfaces so push all frames there. | |
2274 | */ | |
554891e6 | 2275 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
2e161f78 JB |
2276 | (sdata->vif.type == NL80211_IFTYPE_AP || |
2277 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2278 | return RX_DROP_MONITOR; | |
026331c4 | 2279 | |
84040805 JB |
2280 | /* do not return rejected action frames */ |
2281 | if (mgmt->u.action.category & 0x80) | |
2282 | return RX_DROP_UNUSABLE; | |
2283 | ||
2284 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2285 | GFP_ATOMIC); | |
2286 | if (nskb) { | |
292b4df6 | 2287 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2288 | |
292b4df6 JL |
2289 | nmgmt->u.action.category |= 0x80; |
2290 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2291 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2292 | |
2293 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2294 | ||
2295 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a | 2296 | } |
39192c0b JB |
2297 | dev_kfree_skb(rx->skb); |
2298 | return RX_QUEUED; | |
de1ede7a JB |
2299 | } |
2300 | ||
49461622 | 2301 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2302 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2303 | { |
eb9fb5b8 | 2304 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2305 | ieee80211_rx_result rxs; |
77a121c3 JB |
2306 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2307 | __le16 stype; | |
571ecf67 | 2308 | |
af6b6374 JB |
2309 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2310 | if (rxs != RX_CONTINUE) | |
2311 | return rxs; | |
2312 | ||
77a121c3 | 2313 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2314 | |
77a121c3 JB |
2315 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2316 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2317 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2318 | return RX_DROP_MONITOR; | |
472dbc45 | 2319 | |
77a121c3 JB |
2320 | switch (stype) { |
2321 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2322 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2323 | /* process for all: mesh, mlme, ibss */ | |
2324 | break; | |
2325 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2326 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2c31333a CL |
2327 | if (is_multicast_ether_addr(mgmt->da) && |
2328 | !is_broadcast_ether_addr(mgmt->da)) | |
2329 | return RX_DROP_MONITOR; | |
2330 | ||
77a121c3 JB |
2331 | /* process only for station */ |
2332 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2333 | return RX_DROP_MONITOR; | |
2334 | break; | |
2335 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2336 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2337 | /* process only for ibss */ | |
2338 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2339 | return RX_DROP_MONITOR; | |
2340 | break; | |
2341 | default: | |
2342 | return RX_DROP_MONITOR; | |
2343 | } | |
f9d540ee | 2344 | |
77a121c3 | 2345 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2346 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2347 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2348 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2349 | if (rx->sta) |
2350 | rx->sta->rx_packets++; | |
46900298 | 2351 | |
77a121c3 | 2352 | return RX_QUEUED; |
571ecf67 JB |
2353 | } |
2354 | ||
3b8d81e0 | 2355 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2356 | struct ieee80211_rx_data *rx) |
571ecf67 | 2357 | { |
a7767f95 HH |
2358 | int keyidx; |
2359 | unsigned int hdrlen; | |
571ecf67 | 2360 | |
a7767f95 | 2361 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2362 | if (rx->skb->len >= hdrlen + 4) |
2363 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2364 | else | |
2365 | keyidx = -1; | |
2366 | ||
8944b79f | 2367 | if (!rx->sta) { |
aa0daf0e JB |
2368 | /* |
2369 | * Some hardware seem to generate incorrect Michael MIC | |
2370 | * reports; ignore them to avoid triggering countermeasures. | |
2371 | */ | |
af2ced6a | 2372 | return; |
571ecf67 JB |
2373 | } |
2374 | ||
a7767f95 | 2375 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2376 | return; |
571ecf67 | 2377 | |
05c914fe | 2378 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2379 | /* |
2380 | * APs with pairwise keys should never receive Michael MIC | |
2381 | * errors for non-zero keyidx because these are reserved for | |
2382 | * group keys and only the AP is sending real multicast | |
2383 | * frames in the BSS. | |
2384 | */ | |
af2ced6a | 2385 | return; |
571ecf67 JB |
2386 | } |
2387 | ||
a7767f95 HH |
2388 | if (!ieee80211_is_data(hdr->frame_control) && |
2389 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2390 | return; |
571ecf67 | 2391 | |
e6d6e342 JB |
2392 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2393 | GFP_ATOMIC); | |
571ecf67 JB |
2394 | } |
2395 | ||
5cf121c3 | 2396 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2397 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2398 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2399 | { |
2400 | struct ieee80211_sub_if_data *sdata; | |
2401 | struct ieee80211_local *local = rx->local; | |
2402 | struct ieee80211_rtap_hdr { | |
2403 | struct ieee80211_radiotap_header hdr; | |
2404 | u8 flags; | |
5f0b7de5 | 2405 | u8 rate_or_pad; |
3d30d949 MW |
2406 | __le16 chan_freq; |
2407 | __le16 chan_flags; | |
bc10502d | 2408 | } __packed *rthdr; |
3d30d949 MW |
2409 | struct sk_buff *skb = rx->skb, *skb2; |
2410 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2411 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2412 | |
554891e6 JB |
2413 | /* |
2414 | * If cooked monitor has been processed already, then | |
2415 | * don't do it again. If not, set the flag. | |
2416 | */ | |
2417 | if (rx->flags & IEEE80211_RX_CMNTR) | |
7c1e1831 | 2418 | goto out_free_skb; |
554891e6 | 2419 | rx->flags |= IEEE80211_RX_CMNTR; |
7c1e1831 | 2420 | |
3d30d949 MW |
2421 | if (skb_headroom(skb) < sizeof(*rthdr) && |
2422 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2423 | goto out_free_skb; | |
2424 | ||
2425 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2426 | memset(rthdr, 0, sizeof(*rthdr)); | |
2427 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2428 | rthdr->hdr.it_present = | |
2429 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2430 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2431 | ||
5f0b7de5 JB |
2432 | if (rate) { |
2433 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2434 | rthdr->hdr.it_present |= | |
2435 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2436 | } | |
3d30d949 MW |
2437 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2438 | ||
2439 | if (status->band == IEEE80211_BAND_5GHZ) | |
2440 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2441 | IEEE80211_CHAN_5GHZ); | |
2442 | else | |
2443 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2444 | IEEE80211_CHAN_2GHZ); | |
2445 | ||
2446 | skb_set_mac_header(skb, 0); | |
2447 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2448 | skb->pkt_type = PACKET_OTHERHOST; | |
2449 | skb->protocol = htons(ETH_P_802_2); | |
2450 | ||
2451 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2452 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2453 | continue; |
2454 | ||
05c914fe | 2455 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2456 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2457 | continue; | |
2458 | ||
2459 | if (prev_dev) { | |
2460 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2461 | if (skb2) { | |
2462 | skb2->dev = prev_dev; | |
5548a8a1 | 2463 | netif_receive_skb(skb2); |
3d30d949 MW |
2464 | } |
2465 | } | |
2466 | ||
2467 | prev_dev = sdata->dev; | |
2468 | sdata->dev->stats.rx_packets++; | |
2469 | sdata->dev->stats.rx_bytes += skb->len; | |
2470 | } | |
2471 | ||
2472 | if (prev_dev) { | |
2473 | skb->dev = prev_dev; | |
5548a8a1 | 2474 | netif_receive_skb(skb); |
554891e6 JB |
2475 | return; |
2476 | } | |
3d30d949 MW |
2477 | |
2478 | out_free_skb: | |
2479 | dev_kfree_skb(skb); | |
2480 | } | |
2481 | ||
aa0c8636 CL |
2482 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2483 | ieee80211_rx_result res) | |
2484 | { | |
2485 | switch (res) { | |
2486 | case RX_DROP_MONITOR: | |
2487 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2488 | if (rx->sta) | |
2489 | rx->sta->rx_dropped++; | |
2490 | /* fall through */ | |
2491 | case RX_CONTINUE: { | |
2492 | struct ieee80211_rate *rate = NULL; | |
2493 | struct ieee80211_supported_band *sband; | |
2494 | struct ieee80211_rx_status *status; | |
2495 | ||
2496 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2497 | ||
2498 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2499 | if (!(status->flag & RX_FLAG_HT)) | |
2500 | rate = &sband->bitrates[status->rate_idx]; | |
2501 | ||
2502 | ieee80211_rx_cooked_monitor(rx, rate); | |
2503 | break; | |
2504 | } | |
2505 | case RX_DROP_UNUSABLE: | |
2506 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2507 | if (rx->sta) | |
2508 | rx->sta->rx_dropped++; | |
2509 | dev_kfree_skb(rx->skb); | |
2510 | break; | |
2511 | case RX_QUEUED: | |
2512 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2513 | break; | |
2514 | } | |
2515 | } | |
571ecf67 | 2516 | |
24a8fdad | 2517 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) |
58905290 | 2518 | { |
58905290 | 2519 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2520 | struct sk_buff *skb; |
8944b79f | 2521 | |
e32f85f7 LCC |
2522 | #define CALL_RXH(rxh) \ |
2523 | do { \ | |
2524 | res = rxh(rx); \ | |
2525 | if (res != RX_CONTINUE) \ | |
2569a826 | 2526 | goto rxh_next; \ |
e32f85f7 | 2527 | } while (0); |
49461622 | 2528 | |
24a8fdad CL |
2529 | spin_lock(&rx->local->rx_skb_queue.lock); |
2530 | if (rx->local->running_rx_handler) | |
2531 | goto unlock; | |
2532 | ||
2533 | rx->local->running_rx_handler = true; | |
2534 | ||
2535 | while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { | |
2536 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2537 | ||
2569a826 JB |
2538 | /* |
2539 | * all the other fields are valid across frames | |
2540 | * that belong to an aMPDU since they are on the | |
2541 | * same TID from the same station | |
2542 | */ | |
2543 | rx->skb = skb; | |
554891e6 | 2544 | rx->flags = 0; |
2569a826 JB |
2545 | |
2546 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2547 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2548 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2549 | CALL_RXH(ieee80211_rx_h_defragment) | |
2550 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2551 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2552 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2553 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2554 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2555 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2556 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2557 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2558 | #endif |
2569a826 | 2559 | CALL_RXH(ieee80211_rx_h_data) |
24a8fdad | 2560 | CALL_RXH(ieee80211_rx_h_ctrl); |
2e161f78 | 2561 | CALL_RXH(ieee80211_rx_h_mgmt_check) |
2569a826 | 2562 | CALL_RXH(ieee80211_rx_h_action) |
2e161f78 JB |
2563 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) |
2564 | CALL_RXH(ieee80211_rx_h_action_return) | |
2569a826 | 2565 | CALL_RXH(ieee80211_rx_h_mgmt) |
49461622 | 2566 | |
aa0c8636 CL |
2567 | rxh_next: |
2568 | ieee80211_rx_handlers_result(rx, res); | |
24a8fdad | 2569 | spin_lock(&rx->local->rx_skb_queue.lock); |
49461622 | 2570 | #undef CALL_RXH |
aa0c8636 | 2571 | } |
24a8fdad CL |
2572 | |
2573 | rx->local->running_rx_handler = false; | |
2574 | ||
2575 | unlock: | |
2576 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
aa0c8636 CL |
2577 | } |
2578 | ||
4406c376 | 2579 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
aa0c8636 | 2580 | { |
aa0c8636 CL |
2581 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2582 | ||
aa0c8636 CL |
2583 | #define CALL_RXH(rxh) \ |
2584 | do { \ | |
2585 | res = rxh(rx); \ | |
2586 | if (res != RX_CONTINUE) \ | |
2587 | goto rxh_next; \ | |
2588 | } while (0); | |
2589 | ||
2590 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2591 | CALL_RXH(ieee80211_rx_h_check) | |
2592 | ||
24a8fdad | 2593 | ieee80211_rx_reorder_ampdu(rx); |
aa0c8636 | 2594 | |
24a8fdad | 2595 | ieee80211_rx_handlers(rx); |
aa0c8636 | 2596 | return; |
49461622 | 2597 | |
2569a826 | 2598 | rxh_next: |
aa0c8636 CL |
2599 | ieee80211_rx_handlers_result(rx, res); |
2600 | ||
2601 | #undef CALL_RXH | |
58905290 JB |
2602 | } |
2603 | ||
2bff8ebf | 2604 | /* |
dd318575 JB |
2605 | * This function makes calls into the RX path, therefore |
2606 | * it has to be invoked under RCU read lock. | |
2bff8ebf CL |
2607 | */ |
2608 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2609 | { | |
554891e6 JB |
2610 | struct ieee80211_rx_data rx = { |
2611 | .sta = sta, | |
2612 | .sdata = sta->sdata, | |
2613 | .local = sta->local, | |
2614 | .queue = tid, | |
2615 | }; | |
2c15a0cf CL |
2616 | struct tid_ampdu_rx *tid_agg_rx; |
2617 | ||
2618 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2619 | if (!tid_agg_rx) | |
2620 | return; | |
2bff8ebf | 2621 | |
2c15a0cf | 2622 | spin_lock(&tid_agg_rx->reorder_lock); |
24a8fdad | 2623 | ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); |
2c15a0cf | 2624 | spin_unlock(&tid_agg_rx->reorder_lock); |
2bff8ebf | 2625 | |
24a8fdad | 2626 | ieee80211_rx_handlers(&rx); |
2bff8ebf CL |
2627 | } |
2628 | ||
571ecf67 JB |
2629 | /* main receive path */ |
2630 | ||
20b01f80 | 2631 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
23a24def JB |
2632 | struct ieee80211_hdr *hdr) |
2633 | { | |
20b01f80 | 2634 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
eb9fb5b8 JB |
2635 | struct sk_buff *skb = rx->skb; |
2636 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2637 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2638 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2639 | ||
51fb61e7 | 2640 | switch (sdata->vif.type) { |
05c914fe | 2641 | case NL80211_IFTYPE_STATION: |
9bc383de | 2642 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2643 | return 0; |
77fdaa12 | 2644 | if (!multicast && |
47846c9b | 2645 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4f312336 FF |
2646 | if (!(sdata->dev->flags & IFF_PROMISC) || |
2647 | sdata->u.mgd.use_4addr) | |
23a24def | 2648 | return 0; |
554891e6 | 2649 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2650 | } |
2651 | break; | |
05c914fe | 2652 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2653 | if (!bssid) |
2654 | return 0; | |
a7767f95 | 2655 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2656 | return 1; |
87291c02 | 2657 | } |
46900298 | 2658 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
554891e6 | 2659 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2660 | return 0; |
554891e6 | 2661 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2662 | } else if (!multicast && |
47846c9b | 2663 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2664 | hdr->addr1) != 0) { |
4150c572 | 2665 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2666 | return 0; |
554891e6 | 2667 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2668 | } else if (!rx->sta) { |
2669 | int rate_idx; | |
eb9fb5b8 | 2670 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2671 | rate_idx = 0; /* TODO: HT rates */ |
2672 | else | |
eb9fb5b8 | 2673 | rate_idx = status->rate_idx; |
34e89507 JB |
2674 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2675 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2676 | } |
23a24def | 2677 | break; |
05c914fe | 2678 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2679 | if (!multicast && |
47846c9b | 2680 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2681 | hdr->addr1) != 0) { |
2682 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2683 | return 0; | |
2684 | ||
554891e6 | 2685 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2686 | } |
2687 | break; | |
05c914fe JB |
2688 | case NL80211_IFTYPE_AP_VLAN: |
2689 | case NL80211_IFTYPE_AP: | |
23a24def | 2690 | if (!bssid) { |
47846c9b | 2691 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2692 | hdr->addr1)) |
2693 | return 0; | |
2694 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2695 | sdata->vif.addr)) { |
771bbd09 AN |
2696 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && |
2697 | !ieee80211_is_beacon(hdr->frame_control)) | |
23a24def | 2698 | return 0; |
554891e6 | 2699 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2700 | } |
23a24def | 2701 | break; |
05c914fe | 2702 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2703 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2704 | return 0; |
2705 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2706 | return 0; | |
2707 | break; | |
2ca27bcf | 2708 | default: |
fb1c1cd6 JB |
2709 | /* should never get here */ |
2710 | WARN_ON(1); | |
2711 | break; | |
23a24def JB |
2712 | } |
2713 | ||
2714 | return 1; | |
2715 | } | |
2716 | ||
4406c376 JB |
2717 | /* |
2718 | * This function returns whether or not the SKB | |
2719 | * was destined for RX processing or not, which, | |
2720 | * if consume is true, is equivalent to whether | |
2721 | * or not the skb was consumed. | |
2722 | */ | |
2723 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2724 | struct sk_buff *skb, bool consume) | |
2725 | { | |
2726 | struct ieee80211_local *local = rx->local; | |
2727 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2728 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2729 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2730 | int prepares; | |
2731 | ||
2732 | rx->skb = skb; | |
554891e6 | 2733 | status->rx_flags |= IEEE80211_RX_RA_MATCH; |
4406c376 JB |
2734 | prepares = prepare_for_handlers(rx, hdr); |
2735 | ||
2736 | if (!prepares) | |
2737 | return false; | |
2738 | ||
2739 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
554891e6 | 2740 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) |
4406c376 JB |
2741 | ieee80211_rx_michael_mic_report(hdr, rx); |
2742 | return false; | |
2743 | } | |
2744 | ||
2745 | if (!consume) { | |
2746 | skb = skb_copy(skb, GFP_ATOMIC); | |
2747 | if (!skb) { | |
2748 | if (net_ratelimit()) | |
2749 | wiphy_debug(local->hw.wiphy, | |
b305dae4 | 2750 | "failed to copy skb for %s\n", |
4406c376 JB |
2751 | sdata->name); |
2752 | return true; | |
2753 | } | |
2754 | ||
2755 | rx->skb = skb; | |
2756 | } | |
2757 | ||
2758 | ieee80211_invoke_rx_handlers(rx); | |
2759 | return true; | |
2760 | } | |
2761 | ||
571ecf67 | 2762 | /* |
6368e4b1 RR |
2763 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2764 | * be called with rcu_read_lock protection. | |
571ecf67 | 2765 | */ |
71ebb4aa | 2766 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2767 | struct sk_buff *skb) |
571ecf67 | 2768 | { |
554891e6 | 2769 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2770 | struct ieee80211_local *local = hw_to_local(hw); |
2771 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2772 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2773 | __le16 fc; |
5cf121c3 | 2774 | struct ieee80211_rx_data rx; |
4406c376 | 2775 | struct ieee80211_sub_if_data *prev; |
56af3268 | 2776 | struct sta_info *sta, *tmp, *prev_sta; |
e3cf8b3f | 2777 | int err = 0; |
571ecf67 | 2778 | |
e3cf8b3f | 2779 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2780 | memset(&rx, 0, sizeof(rx)); |
2781 | rx.skb = skb; | |
2782 | rx.local = local; | |
72abd81b | 2783 | |
e3cf8b3f | 2784 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2785 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2786 | |
142b9f50 | 2787 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
b23b025f | 2788 | test_bit(SCAN_SW_SCANNING, &local->scanning))) |
554891e6 | 2789 | status->rx_flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2790 | |
e3cf8b3f ZY |
2791 | if (ieee80211_is_mgmt(fc)) |
2792 | err = skb_linearize(skb); | |
2793 | else | |
2794 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2795 | ||
2796 | if (err) { | |
2797 | dev_kfree_skb(skb); | |
2798 | return; | |
2799 | } | |
2800 | ||
2801 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2802 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2803 | ieee80211_verify_alignment(&rx); |
38f3714d | 2804 | |
e3cf8b3f | 2805 | if (ieee80211_is_data(fc)) { |
56af3268 | 2806 | prev_sta = NULL; |
4406c376 | 2807 | |
abe60632 | 2808 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
56af3268 BG |
2809 | if (!prev_sta) { |
2810 | prev_sta = sta; | |
2811 | continue; | |
2812 | } | |
2813 | ||
2814 | rx.sta = prev_sta; | |
2815 | rx.sdata = prev_sta->sdata; | |
4406c376 | 2816 | ieee80211_prepare_and_rx_handle(&rx, skb, false); |
abe60632 | 2817 | |
56af3268 | 2818 | prev_sta = sta; |
4406c376 | 2819 | } |
56af3268 BG |
2820 | |
2821 | if (prev_sta) { | |
2822 | rx.sta = prev_sta; | |
2823 | rx.sdata = prev_sta->sdata; | |
2824 | ||
4406c376 | 2825 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
56af3268 | 2826 | return; |
8e26d5ad | 2827 | goto out; |
56af3268 | 2828 | } |
4406c376 JB |
2829 | } |
2830 | ||
4b0dd98e | 2831 | prev = NULL; |
b2e7771e | 2832 | |
4b0dd98e JB |
2833 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2834 | if (!ieee80211_sdata_running(sdata)) | |
2835 | continue; | |
340e11f3 | 2836 | |
4b0dd98e JB |
2837 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2838 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2839 | continue; | |
340e11f3 | 2840 | |
4b0dd98e JB |
2841 | /* |
2842 | * frame is destined for this interface, but if it's | |
2843 | * not also for the previous one we handle that after | |
2844 | * the loop to avoid copying the SKB once too much | |
2845 | */ | |
4bb29f8c | 2846 | |
4b0dd98e | 2847 | if (!prev) { |
abe60632 | 2848 | prev = sdata; |
4b0dd98e | 2849 | continue; |
340e11f3 | 2850 | } |
4bb29f8c | 2851 | |
4b0dd98e JB |
2852 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
2853 | rx.sdata = prev; | |
2854 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
4bb29f8c | 2855 | |
4b0dd98e JB |
2856 | prev = sdata; |
2857 | } | |
2858 | ||
2859 | if (prev) { | |
2860 | rx.sta = sta_info_get_bss(prev, hdr->addr2); | |
2861 | rx.sdata = prev; | |
4406c376 | 2862 | |
4b0dd98e JB |
2863 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
2864 | return; | |
571ecf67 | 2865 | } |
4406c376 | 2866 | |
8e26d5ad | 2867 | out: |
4406c376 | 2868 | dev_kfree_skb(skb); |
571ecf67 | 2869 | } |
6368e4b1 RR |
2870 | |
2871 | /* | |
2872 | * This is the receive path handler. It is called by a low level driver when an | |
2873 | * 802.11 MPDU is received from the hardware. | |
2874 | */ | |
103bf9f7 | 2875 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2876 | { |
2877 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2878 | struct ieee80211_rate *rate = NULL; |
2879 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2880 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2881 | |
d20ef63d JB |
2882 | WARN_ON_ONCE(softirq_count() == 0); |
2883 | ||
77a980dc JB |
2884 | if (WARN_ON(status->band < 0 || |
2885 | status->band >= IEEE80211_NUM_BANDS)) | |
2886 | goto drop; | |
8318d78a JB |
2887 | |
2888 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2889 | if (WARN_ON(!sband)) |
2890 | goto drop; | |
8318d78a | 2891 | |
89c3a8ac JB |
2892 | /* |
2893 | * If we're suspending, it is possible although not too likely | |
2894 | * that we'd be receiving frames after having already partially | |
2895 | * quiesced the stack. We can't process such frames then since | |
2896 | * that might, for example, cause stations to be added or other | |
2897 | * driver callbacks be invoked. | |
2898 | */ | |
77a980dc JB |
2899 | if (unlikely(local->quiescing || local->suspended)) |
2900 | goto drop; | |
89c3a8ac | 2901 | |
ea77f12f JB |
2902 | /* |
2903 | * The same happens when we're not even started, | |
2904 | * but that's worth a warning. | |
2905 | */ | |
77a980dc JB |
2906 | if (WARN_ON(!local->started)) |
2907 | goto drop; | |
ea77f12f | 2908 | |
fc885189 | 2909 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 2910 | /* |
fc885189 JB |
2911 | * Validate the rate, unless a PLCP error means that |
2912 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 2913 | */ |
fc885189 JB |
2914 | |
2915 | if (status->flag & RX_FLAG_HT) { | |
2916 | /* | |
2917 | * rate_idx is MCS index, which can be [0-76] | |
2918 | * as documented on: | |
2919 | * | |
2920 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2921 | * | |
2922 | * Anything else would be some sort of driver or | |
2923 | * hardware error. The driver should catch hardware | |
2924 | * errors. | |
2925 | */ | |
2926 | if (WARN((status->rate_idx < 0 || | |
2927 | status->rate_idx > 76), | |
2928 | "Rate marked as an HT rate but passed " | |
2929 | "status->rate_idx is not " | |
2930 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2931 | status->rate_idx, | |
2932 | status->rate_idx)) | |
2933 | goto drop; | |
2934 | } else { | |
2935 | if (WARN_ON(status->rate_idx < 0 || | |
2936 | status->rate_idx >= sband->n_bitrates)) | |
2937 | goto drop; | |
2938 | rate = &sband->bitrates[status->rate_idx]; | |
2939 | } | |
0fb8ca45 | 2940 | } |
6368e4b1 | 2941 | |
554891e6 JB |
2942 | status->rx_flags = 0; |
2943 | ||
6368e4b1 RR |
2944 | /* |
2945 | * key references and virtual interfaces are protected using RCU | |
2946 | * and this requires that we are in a read-side RCU section during | |
2947 | * receive processing | |
2948 | */ | |
2949 | rcu_read_lock(); | |
2950 | ||
2951 | /* | |
2952 | * Frames with failed FCS/PLCP checksum are not returned, | |
2953 | * all other frames are returned without radiotap header | |
2954 | * if it was previously present. | |
2955 | * Also, frames with less than 16 bytes are dropped. | |
2956 | */ | |
f1d58c25 | 2957 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2958 | if (!skb) { |
2959 | rcu_read_unlock(); | |
2960 | return; | |
2961 | } | |
2962 | ||
e1e54068 JB |
2963 | ieee80211_tpt_led_trig_rx(local, |
2964 | ((struct ieee80211_hdr *)skb->data)->frame_control, | |
2965 | skb->len); | |
071d9ac2 | 2966 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
2967 | |
2968 | rcu_read_unlock(); | |
77a980dc JB |
2969 | |
2970 | return; | |
2971 | drop: | |
2972 | kfree_skb(skb); | |
6368e4b1 | 2973 | } |
103bf9f7 | 2974 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2975 | |
2976 | /* This is a version of the rx handler that can be called from hard irq | |
2977 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2978 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2979 | { |
2980 | struct ieee80211_local *local = hw_to_local(hw); | |
2981 | ||
2982 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2983 | ||
571ecf67 JB |
2984 | skb->pkt_type = IEEE80211_RX_MSG; |
2985 | skb_queue_tail(&local->skb_queue, skb); | |
2986 | tasklet_schedule(&local->tasklet); | |
2987 | } | |
2988 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |