]>
Commit | Line | Data |
---|---|---|
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> |
bc3b2d7f | 19 | #include <linux/export.h> |
571ecf67 JB |
20 | #include <net/mac80211.h> |
21 | #include <net/ieee80211_radiotap.h> | |
22 | ||
23 | #include "ieee80211_i.h" | |
24487981 | 24 | #include "driver-ops.h" |
2c8dccc7 | 25 | #include "led.h" |
33b64eb2 | 26 | #include "mesh.h" |
571ecf67 JB |
27 | #include "wep.h" |
28 | #include "wpa.h" | |
29 | #include "tkip.h" | |
30 | #include "wme.h" | |
1d8d3dec | 31 | #include "rate.h" |
571ecf67 | 32 | |
b2e7771e JB |
33 | /* |
34 | * monitor mode reception | |
35 | * | |
36 | * This function cleans up the SKB, i.e. it removes all the stuff | |
37 | * only useful for monitoring. | |
38 | */ | |
39 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 40 | struct sk_buff *skb) |
b2e7771e | 41 | { |
b2e7771e JB |
42 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
43 | if (likely(skb->len > FCS_LEN)) | |
e3cf8b3f | 44 | __pskb_trim(skb, skb->len - FCS_LEN); |
b2e7771e JB |
45 | else { |
46 | /* driver bug */ | |
47 | WARN_ON(1); | |
48 | dev_kfree_skb(skb); | |
49 | skb = NULL; | |
50 | } | |
51 | } | |
52 | ||
53 | return skb; | |
54 | } | |
55 | ||
f1d58c25 | 56 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 57 | int present_fcs_len) |
b2e7771e | 58 | { |
f1d58c25 | 59 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 60 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
61 | |
62 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
63 | return 1; | |
0869aea0 | 64 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 65 | return 1; |
87228f57 HH |
66 | if (ieee80211_is_ctl(hdr->frame_control) && |
67 | !ieee80211_is_pspoll(hdr->frame_control) && | |
68 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
69 | return 1; |
70 | return 0; | |
71 | } | |
72 | ||
601ae7f2 BR |
73 | static int |
74 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
75 | struct ieee80211_rx_status *status) | |
76 | { | |
77 | int len; | |
78 | ||
79 | /* always present fields */ | |
80 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
81 | ||
6ebacbb7 | 82 | if (status->flag & RX_FLAG_MACTIME_MPDU) |
601ae7f2 | 83 | len += 8; |
7fee5372 | 84 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 | 85 | len += 1; |
601ae7f2 BR |
86 | |
87 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
88 | len++; | |
89 | ||
6d744bac JB |
90 | if (status->flag & RX_FLAG_HT) /* HT info */ |
91 | len += 3; | |
92 | ||
601ae7f2 BR |
93 | return len; |
94 | } | |
95 | ||
d1c3a37c | 96 | /* |
601ae7f2 BR |
97 | * ieee80211_add_rx_radiotap_header - add radiotap header |
98 | * | |
99 | * add a radiotap header containing all the fields which the hardware provided. | |
100 | */ | |
101 | static void | |
102 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
103 | struct sk_buff *skb, | |
601ae7f2 BR |
104 | struct ieee80211_rate *rate, |
105 | int rtap_len) | |
106 | { | |
f1d58c25 | 107 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
108 | struct ieee80211_radiotap_header *rthdr; |
109 | unsigned char *pos; | |
6a86b9c7 | 110 | u16 rx_flags = 0; |
601ae7f2 BR |
111 | |
112 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
113 | memset(rthdr, 0, rtap_len); | |
114 | ||
115 | /* radiotap header, set always present flags */ | |
116 | rthdr->it_present = | |
117 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
118 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
119 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
120 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
121 | rthdr->it_len = cpu_to_le16(rtap_len); | |
122 | ||
123 | pos = (unsigned char *)(rthdr+1); | |
124 | ||
125 | /* the order of the following fields is important */ | |
126 | ||
127 | /* IEEE80211_RADIOTAP_TSFT */ | |
6ebacbb7 | 128 | if (status->flag & RX_FLAG_MACTIME_MPDU) { |
6a86b9c7 | 129 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
130 | rthdr->it_present |= |
131 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
132 | pos += 8; | |
133 | } | |
134 | ||
135 | /* IEEE80211_RADIOTAP_FLAGS */ | |
136 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
137 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
138 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
139 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
140 | if (status->flag & RX_FLAG_SHORTPRE) |
141 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
142 | pos++; |
143 | ||
144 | /* IEEE80211_RADIOTAP_RATE */ | |
f8d1ccf1 | 145 | if (!rate || status->flag & RX_FLAG_HT) { |
0fb8ca45 | 146 | /* |
f8d1ccf1 | 147 | * Without rate information don't add it. If we have, |
38f37be2 | 148 | * MCS information is a separate field in radiotap, |
73b48099 JB |
149 | * added below. The byte here is needed as padding |
150 | * for the channel though, so initialise it to 0. | |
0fb8ca45 JM |
151 | */ |
152 | *pos = 0; | |
8d6f658e | 153 | } else { |
ebe6c7ba | 154 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 155 | *pos = rate->bitrate / 5; |
8d6f658e | 156 | } |
601ae7f2 BR |
157 | pos++; |
158 | ||
159 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 160 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
161 | pos += 2; |
162 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
163 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
164 | pos); | |
5f0b7de5 JB |
165 | else if (status->flag & RX_FLAG_HT) |
166 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
167 | pos); | |
f8d1ccf1 | 168 | else if (rate && rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
169 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
170 | pos); | |
f8d1ccf1 | 171 | else if (rate) |
6a86b9c7 JB |
172 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
173 | pos); | |
f8d1ccf1 JB |
174 | else |
175 | put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos); | |
601ae7f2 BR |
176 | pos += 2; |
177 | ||
178 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
179 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
180 | *pos = status->signal; | |
181 | rthdr->it_present |= | |
182 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
183 | pos++; | |
184 | } | |
185 | ||
601ae7f2 BR |
186 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
187 | ||
188 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
189 | *pos = status->antenna; | |
190 | pos++; | |
191 | ||
601ae7f2 BR |
192 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
193 | ||
194 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
195 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 196 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 197 | pos++; |
aae89831 | 198 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
199 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
200 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 | 201 | pos += 2; |
6d744bac JB |
202 | |
203 | if (status->flag & RX_FLAG_HT) { | |
204 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); | |
205 | *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS | | |
206 | IEEE80211_RADIOTAP_MCS_HAVE_GI | | |
207 | IEEE80211_RADIOTAP_MCS_HAVE_BW; | |
208 | *pos = 0; | |
209 | if (status->flag & RX_FLAG_SHORT_GI) | |
210 | *pos |= IEEE80211_RADIOTAP_MCS_SGI; | |
211 | if (status->flag & RX_FLAG_40MHZ) | |
212 | *pos |= IEEE80211_RADIOTAP_MCS_BW_40; | |
213 | pos++; | |
214 | *pos++ = status->rate_idx; | |
215 | } | |
601ae7f2 BR |
216 | } |
217 | ||
b2e7771e JB |
218 | /* |
219 | * This function copies a received frame to all monitor interfaces and | |
220 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
221 | * radiotap header the driver might have added. | |
222 | */ | |
223 | static struct sk_buff * | |
224 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 225 | struct ieee80211_rate *rate) |
b2e7771e | 226 | { |
f1d58c25 | 227 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 228 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 229 | int needed_headroom = 0; |
b2e7771e JB |
230 | struct sk_buff *skb, *skb2; |
231 | struct net_device *prev_dev = NULL; | |
232 | int present_fcs_len = 0; | |
b2e7771e JB |
233 | |
234 | /* | |
235 | * First, we may need to make a copy of the skb because | |
236 | * (1) we need to modify it for radiotap (if not present), and | |
237 | * (2) the other RX handlers will modify the skb we got. | |
238 | * | |
239 | * We don't need to, of course, if we aren't going to return | |
240 | * the SKB because it has a bad FCS/PLCP checksum. | |
241 | */ | |
0869aea0 JB |
242 | |
243 | /* room for the radiotap header based on driver features */ | |
244 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
245 | |
246 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
247 | present_fcs_len = FCS_LEN; | |
248 | ||
e3cf8b3f ZY |
249 | /* make sure hdr->frame_control is on the linear part */ |
250 | if (!pskb_may_pull(origskb, 2)) { | |
251 | dev_kfree_skb(origskb); | |
252 | return NULL; | |
253 | } | |
254 | ||
b2e7771e | 255 | if (!local->monitors) { |
0869aea0 | 256 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
257 | dev_kfree_skb(origskb); |
258 | return NULL; | |
259 | } | |
260 | ||
0869aea0 | 261 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
262 | } |
263 | ||
0869aea0 | 264 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
265 | /* only need to expand headroom if necessary */ |
266 | skb = origskb; | |
267 | origskb = NULL; | |
268 | ||
269 | /* | |
270 | * This shouldn't trigger often because most devices have an | |
271 | * RX header they pull before we get here, and that should | |
272 | * be big enough for our radiotap information. We should | |
273 | * probably export the length to drivers so that we can have | |
274 | * them allocate enough headroom to start with. | |
275 | */ | |
276 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 277 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
278 | dev_kfree_skb(skb); |
279 | return NULL; | |
280 | } | |
281 | } else { | |
282 | /* | |
283 | * Need to make a copy and possibly remove radiotap header | |
284 | * and FCS from the original. | |
285 | */ | |
286 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
287 | ||
0869aea0 | 288 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
289 | |
290 | if (!skb) | |
291 | return origskb; | |
292 | } | |
293 | ||
0869aea0 JB |
294 | /* prepend radiotap information */ |
295 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 296 | |
ce3edf6d | 297 | skb_reset_mac_header(skb); |
b2e7771e JB |
298 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
299 | skb->pkt_type = PACKET_OTHERHOST; | |
300 | skb->protocol = htons(ETH_P_802_2); | |
301 | ||
302 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 303 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
304 | continue; |
305 | ||
3d30d949 MW |
306 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
307 | continue; | |
308 | ||
9607e6b6 | 309 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
310 | continue; |
311 | ||
b2e7771e JB |
312 | if (prev_dev) { |
313 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
314 | if (skb2) { | |
315 | skb2->dev = prev_dev; | |
5548a8a1 | 316 | netif_receive_skb(skb2); |
b2e7771e JB |
317 | } |
318 | } | |
319 | ||
320 | prev_dev = sdata->dev; | |
321 | sdata->dev->stats.rx_packets++; | |
322 | sdata->dev->stats.rx_bytes += skb->len; | |
323 | } | |
324 | ||
325 | if (prev_dev) { | |
326 | skb->dev = prev_dev; | |
5548a8a1 | 327 | netif_receive_skb(skb); |
b2e7771e JB |
328 | } else |
329 | dev_kfree_skb(skb); | |
330 | ||
331 | return origskb; | |
332 | } | |
333 | ||
334 | ||
5cf121c3 | 335 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 336 | { |
238f74a2 | 337 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 338 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
9e26297a | 339 | int tid, seqno_idx, security_idx; |
6e0d114d JB |
340 | |
341 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
342 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
343 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 344 | /* frame has qos control */ |
238f74a2 | 345 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
04b7dcf9 | 346 | if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) |
554891e6 | 347 | status->rx_flags |= IEEE80211_RX_AMSDU; |
9e26297a JB |
348 | |
349 | seqno_idx = tid; | |
350 | security_idx = tid; | |
6e0d114d | 351 | } else { |
1411f9b5 JB |
352 | /* |
353 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
354 | * | |
355 | * Sequence numbers for management frames, QoS data | |
356 | * frames with a broadcast/multicast address in the | |
357 | * Address 1 field, and all non-QoS data frames sent | |
358 | * by QoS STAs are assigned using an additional single | |
359 | * modulo-4096 counter, [...] | |
360 | * | |
361 | * We also use that counter for non-QoS STAs. | |
362 | */ | |
9e26297a JB |
363 | seqno_idx = NUM_RX_DATA_QUEUES; |
364 | security_idx = 0; | |
365 | if (ieee80211_is_mgmt(hdr->frame_control)) | |
366 | security_idx = NUM_RX_DATA_QUEUES; | |
367 | tid = 0; | |
6e0d114d | 368 | } |
52865dfd | 369 | |
9e26297a JB |
370 | rx->seqno_idx = seqno_idx; |
371 | rx->security_idx = security_idx; | |
6e0d114d JB |
372 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
373 | * For now, set skb->priority to 0 for other cases. */ | |
374 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 375 | } |
6e0d114d | 376 | |
d1c3a37c JB |
377 | /** |
378 | * DOC: Packet alignment | |
379 | * | |
380 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
381 | * to the stack. | |
382 | * | |
383 | * Additionally, should, if possible, align the payload data in a way that | |
384 | * guarantees that the contained IP header is aligned to a four-byte | |
385 | * boundary. In the case of regular frames, this simply means aligning the | |
386 | * payload to a four-byte boundary (because either the IP header is directly | |
387 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
388 | * in front of it). If the payload data is not properly aligned and the |
389 | * architecture doesn't support efficient unaligned operations, mac80211 | |
390 | * will align the data. | |
d1c3a37c JB |
391 | * |
392 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
393 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
394 | * push the IP header further back to a multiple of four again. Thankfully, the | |
395 | * specs were sane enough this time around to require padding each A-MSDU | |
396 | * subframe to a length that is a multiple of four. | |
397 | * | |
25985edc | 398 | * Padding like Atheros hardware adds which is between the 802.11 header and |
d1c3a37c JB |
399 | * the payload is not supported, the driver is required to move the 802.11 |
400 | * header to be directly in front of the payload in that case. | |
401 | */ | |
402 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 403 | { |
59d9cb07 KV |
404 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
405 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
406 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 407 | #endif |
6e0d114d JB |
408 | } |
409 | ||
6368e4b1 | 410 | |
571ecf67 JB |
411 | /* rx handlers */ |
412 | ||
49461622 | 413 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 414 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
415 | { |
416 | struct ieee80211_local *local = rx->local; | |
554891e6 | 417 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
418 | struct sk_buff *skb = rx->skb; |
419 | ||
79f460ca LC |
420 | if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) && |
421 | !local->sched_scanning)) | |
4080c7cd JB |
422 | return RX_CONTINUE; |
423 | ||
b23b025f | 424 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) || |
79f460ca LC |
425 | test_bit(SCAN_SW_SCANNING, &local->scanning) || |
426 | local->sched_scanning) | |
f1d58c25 | 427 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 428 | |
4080c7cd JB |
429 | /* scanning finished during invoking of handlers */ |
430 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
431 | return RX_DROP_UNUSABLE; | |
571ecf67 JB |
432 | } |
433 | ||
3cfcf6ac JM |
434 | |
435 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
436 | { | |
437 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
438 | ||
439 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
440 | return 0; | |
441 | ||
442 | return ieee80211_is_robust_mgmt_frame(hdr); | |
443 | } | |
444 | ||
445 | ||
446 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
447 | { | |
448 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
449 | ||
450 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
451 | return 0; | |
452 | ||
453 | return ieee80211_is_robust_mgmt_frame(hdr); | |
454 | } | |
455 | ||
456 | ||
457 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
458 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
459 | { | |
460 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
461 | struct ieee80211_mmie *mmie; | |
462 | ||
463 | if (skb->len < 24 + sizeof(*mmie) || | |
464 | !is_multicast_ether_addr(hdr->da)) | |
465 | return -1; | |
466 | ||
467 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
468 | return -1; /* not a robust management frame */ | |
469 | ||
470 | mmie = (struct ieee80211_mmie *) | |
471 | (skb->data + skb->len - sizeof(*mmie)); | |
472 | if (mmie->element_id != WLAN_EID_MMIE || | |
473 | mmie->length != sizeof(*mmie) - 2) | |
474 | return -1; | |
475 | ||
476 | return le16_to_cpu(mmie->key_id); | |
477 | } | |
478 | ||
479 | ||
33b64eb2 | 480 | static ieee80211_rx_result |
5cf121c3 | 481 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 482 | { |
a7767f95 | 483 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
47846c9b | 484 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 485 | |
a7767f95 | 486 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
487 | if (is_multicast_ether_addr(hdr->addr1)) { |
488 | if (ieee80211_has_tods(hdr->frame_control) || | |
489 | !ieee80211_has_fromds(hdr->frame_control)) | |
490 | return RX_DROP_MONITOR; | |
491 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
492 | return RX_DROP_MONITOR; | |
493 | } else { | |
494 | if (!ieee80211_has_a4(hdr->frame_control)) | |
495 | return RX_DROP_MONITOR; | |
496 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
497 | return RX_DROP_MONITOR; | |
498 | } | |
33b64eb2 LCC |
499 | } |
500 | ||
501 | /* If there is not an established peer link and this is not a peer link | |
502 | * establisment frame, beacon or probe, drop the frame. | |
503 | */ | |
504 | ||
57cf8043 | 505 | if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { |
33b64eb2 | 506 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 507 | |
a7767f95 | 508 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
509 | return RX_DROP_MONITOR; |
510 | ||
a7767f95 | 511 | if (ieee80211_is_action(hdr->frame_control)) { |
d3aaec8a | 512 | u8 category; |
33b64eb2 | 513 | mgmt = (struct ieee80211_mgmt *)hdr; |
d3aaec8a JC |
514 | category = mgmt->u.action.category; |
515 | if (category != WLAN_CATEGORY_MESH_ACTION && | |
516 | category != WLAN_CATEGORY_SELF_PROTECTED) | |
33b64eb2 | 517 | return RX_DROP_MONITOR; |
33b64eb2 | 518 | return RX_CONTINUE; |
33b64eb2 LCC |
519 | } |
520 | ||
a7767f95 HH |
521 | if (ieee80211_is_probe_req(hdr->frame_control) || |
522 | ieee80211_is_probe_resp(hdr->frame_control) || | |
71839121 JC |
523 | ieee80211_is_beacon(hdr->frame_control) || |
524 | ieee80211_is_auth(hdr->frame_control)) | |
a7767f95 HH |
525 | return RX_CONTINUE; |
526 | ||
527 | return RX_DROP_MONITOR; | |
528 | ||
529 | } | |
530 | ||
902acc78 JB |
531 | return RX_CONTINUE; |
532 | } | |
33b64eb2 | 533 | |
1edfb1af JB |
534 | #define SEQ_MODULO 0x1000 |
535 | #define SEQ_MASK 0xfff | |
536 | ||
537 | static inline int seq_less(u16 sq1, u16 sq2) | |
538 | { | |
539 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
540 | } | |
541 | ||
542 | static inline u16 seq_inc(u16 sq) | |
543 | { | |
544 | return (sq + 1) & SEQ_MASK; | |
545 | } | |
546 | ||
547 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
548 | { | |
549 | return (sq1 - sq2) & SEQ_MASK; | |
550 | } | |
551 | ||
552 | ||
553 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
554 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 555 | int index) |
1edfb1af | 556 | { |
24a8fdad | 557 | struct ieee80211_local *local = hw_to_local(hw); |
1edfb1af | 558 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
4cfda47b | 559 | struct ieee80211_rx_status *status; |
1edfb1af | 560 | |
dd318575 JB |
561 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
562 | ||
1edfb1af JB |
563 | if (!skb) |
564 | goto no_frame; | |
565 | ||
071d9ac2 | 566 | /* release the frame from the reorder ring buffer */ |
1edfb1af JB |
567 | tid_agg_rx->stored_mpdu_num--; |
568 | tid_agg_rx->reorder_buf[index] = NULL; | |
4cfda47b CL |
569 | status = IEEE80211_SKB_RXCB(skb); |
570 | status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; | |
24a8fdad | 571 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af JB |
572 | |
573 | no_frame: | |
574 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
575 | } | |
576 | ||
577 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
578 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 579 | u16 head_seq_num) |
1edfb1af JB |
580 | { |
581 | int index; | |
582 | ||
dd318575 JB |
583 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
584 | ||
1edfb1af JB |
585 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
586 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
587 | tid_agg_rx->buf_size; | |
24a8fdad | 588 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
1edfb1af JB |
589 | } |
590 | } | |
591 | ||
592 | /* | |
593 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
594 | * the skb was added to the buffer longer than this time ago, the earlier | |
595 | * frames that have not yet been received are assumed to be lost and the skb | |
596 | * can be released for processing. This may also release other skb's from the | |
597 | * reorder buffer if there are no additional gaps between the frames. | |
2bff8ebf CL |
598 | * |
599 | * Callers must hold tid_agg_rx->reorder_lock. | |
1edfb1af JB |
600 | */ |
601 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
602 | ||
aa0c8636 | 603 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
24a8fdad | 604 | struct tid_ampdu_rx *tid_agg_rx) |
aa0c8636 | 605 | { |
2bff8ebf | 606 | int index, j; |
aa0c8636 | 607 | |
dd318575 JB |
608 | lockdep_assert_held(&tid_agg_rx->reorder_lock); |
609 | ||
aa0c8636 CL |
610 | /* release the buffer until next missing frame */ |
611 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
612 | tid_agg_rx->buf_size; | |
613 | if (!tid_agg_rx->reorder_buf[index] && | |
614 | tid_agg_rx->stored_mpdu_num > 1) { | |
615 | /* | |
616 | * No buffers ready to be released, but check whether any | |
617 | * frames in the reorder buffer have timed out. | |
618 | */ | |
aa0c8636 CL |
619 | int skipped = 1; |
620 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
621 | j = (j + 1) % tid_agg_rx->buf_size) { | |
622 | if (!tid_agg_rx->reorder_buf[j]) { | |
623 | skipped++; | |
624 | continue; | |
625 | } | |
499fe9a4 DH |
626 | if (skipped && |
627 | !time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
aa0c8636 | 628 | HT_RX_REORDER_BUF_TIMEOUT)) |
2bff8ebf | 629 | goto set_release_timer; |
aa0c8636 CL |
630 | |
631 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
632 | if (net_ratelimit()) | |
0fb9a9ec JP |
633 | wiphy_debug(hw->wiphy, |
634 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
aa0c8636 | 635 | #endif |
24a8fdad | 636 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
aa0c8636 CL |
637 | |
638 | /* | |
639 | * Increment the head seq# also for the skipped slots. | |
640 | */ | |
641 | tid_agg_rx->head_seq_num = | |
642 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
643 | skipped = 0; | |
644 | } | |
645 | } else while (tid_agg_rx->reorder_buf[index]) { | |
24a8fdad | 646 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
aa0c8636 CL |
647 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
648 | tid_agg_rx->buf_size; | |
649 | } | |
2bff8ebf CL |
650 | |
651 | if (tid_agg_rx->stored_mpdu_num) { | |
652 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
653 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
654 | ||
655 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
656 | j = (j + 1) % tid_agg_rx->buf_size) { | |
657 | if (tid_agg_rx->reorder_buf[j]) | |
658 | break; | |
659 | } | |
660 | ||
661 | set_release_timer: | |
662 | ||
663 | mod_timer(&tid_agg_rx->reorder_timer, | |
334df731 | 664 | tid_agg_rx->reorder_time[j] + 1 + |
2bff8ebf CL |
665 | HT_RX_REORDER_BUF_TIMEOUT); |
666 | } else { | |
667 | del_timer(&tid_agg_rx->reorder_timer); | |
668 | } | |
aa0c8636 CL |
669 | } |
670 | ||
1edfb1af JB |
671 | /* |
672 | * As this function belongs to the RX path it must be under | |
673 | * rcu_read_lock protection. It returns false if the frame | |
674 | * can be processed immediately, true if it was consumed. | |
675 | */ | |
676 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
677 | struct tid_ampdu_rx *tid_agg_rx, | |
24a8fdad | 678 | struct sk_buff *skb) |
1edfb1af JB |
679 | { |
680 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
681 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
682 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
683 | u16 head_seq_num, buf_size; | |
684 | int index; | |
2bff8ebf | 685 | bool ret = true; |
1edfb1af | 686 | |
dd318575 JB |
687 | spin_lock(&tid_agg_rx->reorder_lock); |
688 | ||
1edfb1af JB |
689 | buf_size = tid_agg_rx->buf_size; |
690 | head_seq_num = tid_agg_rx->head_seq_num; | |
691 | ||
692 | /* frame with out of date sequence number */ | |
693 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
694 | dev_kfree_skb(skb); | |
2bff8ebf | 695 | goto out; |
1edfb1af JB |
696 | } |
697 | ||
698 | /* | |
699 | * If frame the sequence number exceeds our buffering window | |
700 | * size release some previous frames to make room for this one. | |
701 | */ | |
702 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
703 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
704 | /* release stored frames up to new head to stack */ | |
24a8fdad | 705 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); |
1edfb1af JB |
706 | } |
707 | ||
708 | /* Now the new frame is always in the range of the reordering buffer */ | |
709 | ||
710 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
711 | ||
712 | /* check if we already stored this frame */ | |
713 | if (tid_agg_rx->reorder_buf[index]) { | |
714 | dev_kfree_skb(skb); | |
2bff8ebf | 715 | goto out; |
1edfb1af JB |
716 | } |
717 | ||
718 | /* | |
719 | * If the current MPDU is in the right order and nothing else | |
720 | * is stored we can process it directly, no need to buffer it. | |
c835b214 JB |
721 | * If it is first but there's something stored, we may be able |
722 | * to release frames after this one. | |
1edfb1af JB |
723 | */ |
724 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
725 | tid_agg_rx->stored_mpdu_num == 0) { | |
726 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2bff8ebf CL |
727 | ret = false; |
728 | goto out; | |
1edfb1af JB |
729 | } |
730 | ||
731 | /* put the frame in the reordering buffer */ | |
732 | tid_agg_rx->reorder_buf[index] = skb; | |
733 | tid_agg_rx->reorder_time[index] = jiffies; | |
734 | tid_agg_rx->stored_mpdu_num++; | |
24a8fdad | 735 | ieee80211_sta_reorder_release(hw, tid_agg_rx); |
1edfb1af | 736 | |
2bff8ebf CL |
737 | out: |
738 | spin_unlock(&tid_agg_rx->reorder_lock); | |
739 | return ret; | |
1edfb1af JB |
740 | } |
741 | ||
742 | /* | |
743 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
744 | * true if the MPDU was buffered, false if it should be processed. | |
745 | */ | |
24a8fdad | 746 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) |
1edfb1af | 747 | { |
2569a826 JB |
748 | struct sk_buff *skb = rx->skb; |
749 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
750 | struct ieee80211_hw *hw = &local->hw; |
751 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
660c6a44 | 752 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
2569a826 | 753 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
754 | struct tid_ampdu_rx *tid_agg_rx; |
755 | u16 sc; | |
6cc00d54 | 756 | u8 tid, ack_policy; |
1edfb1af JB |
757 | |
758 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 759 | goto dont_reorder; |
1edfb1af JB |
760 | |
761 | /* | |
762 | * filter the QoS data rx stream according to | |
763 | * STA/TID and check if this STA/TID is on aggregation | |
764 | */ | |
765 | ||
1edfb1af | 766 | if (!sta) |
2569a826 | 767 | goto dont_reorder; |
1edfb1af | 768 | |
6cc00d54 TP |
769 | ack_policy = *ieee80211_get_qos_ctl(hdr) & |
770 | IEEE80211_QOS_CTL_ACK_POLICY_MASK; | |
1edfb1af JB |
771 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
772 | ||
a87f736d JB |
773 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
774 | if (!tid_agg_rx) | |
775 | goto dont_reorder; | |
1edfb1af JB |
776 | |
777 | /* qos null data frames are excluded */ | |
778 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a87f736d | 779 | goto dont_reorder; |
1edfb1af | 780 | |
6cc00d54 TP |
781 | /* not part of a BA session */ |
782 | if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && | |
783 | ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) | |
784 | goto dont_reorder; | |
785 | ||
660c6a44 TP |
786 | /* not actually part of this BA session */ |
787 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
788 | goto dont_reorder; | |
789 | ||
1edfb1af JB |
790 | /* new, potentially un-ordered, ampdu frame - process it */ |
791 | ||
792 | /* reset session timer */ | |
793 | if (tid_agg_rx->timeout) | |
794 | mod_timer(&tid_agg_rx->session_timer, | |
795 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
796 | ||
797 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
798 | sc = le16_to_cpu(hdr->seq_ctrl); | |
799 | if (sc & IEEE80211_SCTL_FRAG) { | |
c1475ca9 | 800 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
344eec67 JB |
801 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
802 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
2569a826 | 803 | return; |
1edfb1af JB |
804 | } |
805 | ||
a87f736d JB |
806 | /* |
807 | * No locking needed -- we will only ever process one | |
808 | * RX packet at a time, and thus own tid_agg_rx. All | |
809 | * other code manipulating it needs to (and does) make | |
810 | * sure that we cannot get to it any more before doing | |
811 | * anything with it. | |
812 | */ | |
24a8fdad | 813 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) |
2569a826 JB |
814 | return; |
815 | ||
816 | dont_reorder: | |
24a8fdad | 817 | skb_queue_tail(&local->rx_skb_queue, skb); |
1edfb1af | 818 | } |
33b64eb2 | 819 | |
49461622 | 820 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 821 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 822 | { |
a7767f95 | 823 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
554891e6 | 824 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 JB |
825 | |
826 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
827 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 828 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
9e26297a | 829 | rx->sta->last_seq_ctrl[rx->seqno_idx] == |
571ecf67 | 830 | hdr->seq_ctrl)) { |
554891e6 | 831 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
832 | rx->local->dot11FrameDuplicateCount++; |
833 | rx->sta->num_duplicates++; | |
834 | } | |
b1f93314 | 835 | return RX_DROP_UNUSABLE; |
571ecf67 | 836 | } else |
9e26297a | 837 | rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; |
571ecf67 JB |
838 | } |
839 | ||
571ecf67 JB |
840 | if (unlikely(rx->skb->len < 16)) { |
841 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 842 | return RX_DROP_MONITOR; |
571ecf67 JB |
843 | } |
844 | ||
571ecf67 JB |
845 | /* Drop disallowed frame classes based on STA auth/assoc state; |
846 | * IEEE 802.11, Chap 5.5. | |
847 | * | |
ccd7b362 JB |
848 | * mac80211 filters only based on association state, i.e. it drops |
849 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
850 | * deauth/disassoc frames when needed. In addition, hostapd is |
851 | * responsible for filtering on both auth and assoc states. | |
852 | */ | |
33b64eb2 | 853 | |
902acc78 | 854 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 855 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 856 | |
a7767f95 HH |
857 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
858 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 859 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
1be7fe8d | 860 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && |
c2c98fde | 861 | (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { |
7852e361 JB |
862 | /* |
863 | * accept port control frames from the AP even when it's not | |
864 | * yet marked ASSOC to prevent a race where we don't set the | |
865 | * assoc bit quickly enough before it sends the first frame | |
866 | */ | |
867 | if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
2a33bee2 GE |
868 | ieee80211_is_data_present(hdr->frame_control)) { |
869 | u16 ethertype; | |
870 | u8 *payload; | |
871 | ||
872 | payload = rx->skb->data + | |
873 | ieee80211_hdrlen(hdr->frame_control); | |
874 | ethertype = (payload[6] << 8) | payload[7]; | |
875 | if (cpu_to_be16(ethertype) == | |
876 | rx->sdata->control_port_protocol) | |
877 | return RX_CONTINUE; | |
878 | } | |
21fc7560 JB |
879 | |
880 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && | |
881 | cfg80211_rx_spurious_frame(rx->sdata->dev, | |
882 | hdr->addr2, | |
883 | GFP_ATOMIC)) | |
884 | return RX_DROP_UNUSABLE; | |
885 | ||
e4c26add | 886 | return RX_DROP_MONITOR; |
2a33bee2 | 887 | } |
571ecf67 | 888 | |
9ae54c84 | 889 | return RX_CONTINUE; |
570bd537 JB |
890 | } |
891 | ||
892 | ||
49461622 | 893 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 894 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 895 | { |
eb9fb5b8 JB |
896 | struct sk_buff *skb = rx->skb; |
897 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
898 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
899 | int keyidx; |
900 | int hdrlen; | |
e4c26add | 901 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
e31b8213 | 902 | struct ieee80211_key *sta_ptk = NULL; |
3cfcf6ac | 903 | int mmie_keyidx = -1; |
761ab470 | 904 | __le16 fc; |
570bd537 | 905 | |
3017b80b JB |
906 | /* |
907 | * Key selection 101 | |
908 | * | |
3cfcf6ac | 909 | * There are four types of keys: |
3017b80b | 910 | * - GTK (group keys) |
3cfcf6ac | 911 | * - IGTK (group keys for management frames) |
3017b80b JB |
912 | * - PTK (pairwise keys) |
913 | * - STK (station-to-station pairwise keys) | |
914 | * | |
915 | * When selecting a key, we have to distinguish between multicast | |
916 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
917 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
918 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
919 | * unicast frames can also use key indices like GTKs. Hence, if we | |
920 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 921 | * |
8dc06a1c JB |
922 | * Note that in a regular BSS, multicast frames are sent by the |
923 | * AP only, associated stations unicast the frame to the AP first | |
924 | * which then multicasts it on their behalf. | |
925 | * | |
3017b80b JB |
926 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
927 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
928 | * The spec seems to expect that one negotiates the same key with |
929 | * every station but there's no such requirement; VLANs could be | |
930 | * possible. | |
3017b80b JB |
931 | */ |
932 | ||
3017b80b | 933 | /* |
1990af8d | 934 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
935 | * addressed to us nor a multicast frame. |
936 | */ | |
554891e6 | 937 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 938 | return RX_CONTINUE; |
3017b80b | 939 | |
2569a826 JB |
940 | /* start without a key */ |
941 | rx->key = NULL; | |
942 | ||
d4e46a3d | 943 | if (rx->sta) |
e31b8213 | 944 | sta_ptk = rcu_dereference(rx->sta->ptk); |
d4e46a3d | 945 | |
761ab470 JB |
946 | fc = hdr->frame_control; |
947 | ||
948 | if (!ieee80211_has_protected(fc)) | |
0c7c10c7 JM |
949 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
950 | ||
e31b8213 JB |
951 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
952 | rx->key = sta_ptk; | |
dc1580dd JB |
953 | if ((status->flag & RX_FLAG_DECRYPTED) && |
954 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
955 | return RX_CONTINUE; | |
0c7c10c7 | 956 | /* Skip decryption if the frame is not protected. */ |
761ab470 | 957 | if (!ieee80211_has_protected(fc)) |
0c7c10c7 | 958 | return RX_CONTINUE; |
3cfcf6ac JM |
959 | } else if (mmie_keyidx >= 0) { |
960 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
961 | if ((status->flag & RX_FLAG_DECRYPTED) && |
962 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
963 | return RX_CONTINUE; |
964 | ||
965 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
966 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
967 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
e31b8213 JB |
968 | if (rx->sta) |
969 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
970 | if (!rx->key) | |
971 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
761ab470 | 972 | } else if (!ieee80211_has_protected(fc)) { |
0c7c10c7 JM |
973 | /* |
974 | * The frame was not protected, so skip decryption. However, we | |
975 | * need to set rx->key if there is a key that could have been | |
976 | * used so that the frame may be dropped if encryption would | |
977 | * have been expected. | |
978 | */ | |
979 | struct ieee80211_key *key = NULL; | |
897bed8b JB |
980 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
981 | int i; | |
982 | ||
761ab470 | 983 | if (ieee80211_is_mgmt(fc) && |
0c7c10c7 JM |
984 | is_multicast_ether_addr(hdr->addr1) && |
985 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
986 | rx->key = key; | |
897bed8b JB |
987 | else { |
988 | if (rx->sta) { | |
989 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
990 | key = rcu_dereference(rx->sta->gtk[i]); | |
991 | if (key) | |
992 | break; | |
993 | } | |
994 | } | |
995 | if (!key) { | |
996 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
997 | key = rcu_dereference(sdata->keys[i]); | |
998 | if (key) | |
999 | break; | |
1000 | } | |
1001 | } | |
1002 | if (key) | |
1003 | rx->key = key; | |
1004 | } | |
0c7c10c7 | 1005 | return RX_CONTINUE; |
571ecf67 | 1006 | } else { |
39184b15 | 1007 | u8 keyid; |
3017b80b JB |
1008 | /* |
1009 | * The device doesn't give us the IV so we won't be | |
1010 | * able to look up the key. That's ok though, we | |
1011 | * don't need to decrypt the frame, we just won't | |
1012 | * be able to keep statistics accurate. | |
1013 | * Except for key threshold notifications, should | |
1014 | * we somehow allow the driver to tell us which key | |
1015 | * the hardware used if this flag is set? | |
1016 | */ | |
eb9fb5b8 JB |
1017 | if ((status->flag & RX_FLAG_DECRYPTED) && |
1018 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 1019 | return RX_CONTINUE; |
3017b80b | 1020 | |
761ab470 | 1021 | hdrlen = ieee80211_hdrlen(fc); |
3017b80b JB |
1022 | |
1023 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 1024 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
1025 | |
1026 | /* | |
1027 | * no need to call ieee80211_wep_get_keyidx, | |
1028 | * it verifies a bunch of things we've done already | |
1029 | */ | |
39184b15 ZY |
1030 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
1031 | keyidx = keyid >> 6; | |
3017b80b | 1032 | |
e31b8213 JB |
1033 | /* check per-station GTK first, if multicast packet */ |
1034 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
1035 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
3017b80b | 1036 | |
e31b8213 JB |
1037 | /* if not found, try default key */ |
1038 | if (!rx->key) { | |
1039 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
1040 | ||
1041 | /* | |
1042 | * RSNA-protected unicast frames should always be | |
1043 | * sent with pairwise or station-to-station keys, | |
1044 | * but for WEP we allow using a key index as well. | |
1045 | */ | |
1046 | if (rx->key && | |
1047 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
1048 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1049 | !is_multicast_ether_addr(hdr->addr1)) | |
1050 | rx->key = NULL; | |
1051 | } | |
571ecf67 JB |
1052 | } |
1053 | ||
3017b80b | 1054 | if (rx->key) { |
95acac61 JB |
1055 | if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) |
1056 | return RX_DROP_MONITOR; | |
1057 | ||
571ecf67 | 1058 | rx->key->tx_rx_count++; |
011bfcc4 | 1059 | /* TODO: add threshold stuff again */ |
1990af8d | 1060 | } else { |
e4c26add | 1061 | return RX_DROP_MONITOR; |
70f08765 JB |
1062 | } |
1063 | ||
39184b15 ZY |
1064 | if (skb_linearize(rx->skb)) |
1065 | return RX_DROP_UNUSABLE; | |
761ab470 | 1066 | /* the hdr variable is invalid now! */ |
1990af8d | 1067 | |
97359d12 JB |
1068 | switch (rx->key->conf.cipher) { |
1069 | case WLAN_CIPHER_SUITE_WEP40: | |
1070 | case WLAN_CIPHER_SUITE_WEP104: | |
761ab470 JB |
1071 | /* Check for weak IVs if possible */ |
1072 | if (rx->sta && ieee80211_is_data(fc) && | |
1073 | (!(status->flag & RX_FLAG_IV_STRIPPED) || | |
1074 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1075 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) | |
1076 | rx->sta->wep_weak_iv_count++; | |
1077 | ||
e2f036da MN |
1078 | result = ieee80211_crypto_wep_decrypt(rx); |
1079 | break; | |
97359d12 | 1080 | case WLAN_CIPHER_SUITE_TKIP: |
e2f036da MN |
1081 | result = ieee80211_crypto_tkip_decrypt(rx); |
1082 | break; | |
97359d12 | 1083 | case WLAN_CIPHER_SUITE_CCMP: |
e2f036da MN |
1084 | result = ieee80211_crypto_ccmp_decrypt(rx); |
1085 | break; | |
97359d12 | 1086 | case WLAN_CIPHER_SUITE_AES_CMAC: |
3cfcf6ac JM |
1087 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
1088 | break; | |
3ffc2a90 JB |
1089 | default: |
1090 | /* | |
1091 | * We can reach here only with HW-only algorithms | |
1092 | * but why didn't it decrypt the frame?! | |
1093 | */ | |
1094 | return RX_DROP_UNUSABLE; | |
70f08765 JB |
1095 | } |
1096 | ||
e2f036da | 1097 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 1098 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
1099 | |
1100 | return result; | |
70f08765 JB |
1101 | } |
1102 | ||
572e0012 KV |
1103 | static ieee80211_rx_result debug_noinline |
1104 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1105 | { | |
1106 | struct ieee80211_local *local; | |
1107 | struct ieee80211_hdr *hdr; | |
1108 | struct sk_buff *skb; | |
1109 | ||
1110 | local = rx->local; | |
1111 | skb = rx->skb; | |
1112 | hdr = (struct ieee80211_hdr *) skb->data; | |
1113 | ||
1114 | if (!local->pspolling) | |
1115 | return RX_CONTINUE; | |
1116 | ||
1117 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1118 | /* this is not from AP */ | |
1119 | return RX_CONTINUE; | |
1120 | ||
1121 | if (!ieee80211_is_data(hdr->frame_control)) | |
1122 | return RX_CONTINUE; | |
1123 | ||
1124 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1125 | /* AP has no more frames buffered for us */ | |
1126 | local->pspolling = false; | |
1127 | return RX_CONTINUE; | |
1128 | } | |
1129 | ||
1130 | /* more data bit is set, let's request a new frame from the AP */ | |
1131 | ieee80211_send_pspoll(local, rx->sdata); | |
1132 | ||
1133 | return RX_CONTINUE; | |
1134 | } | |
1135 | ||
133b8226 | 1136 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1137 | { |
133b8226 | 1138 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1139 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1140 | |
3e122be0 | 1141 | atomic_inc(&sdata->bss->num_sta_ps); |
c2c98fde | 1142 | set_sta_flag(sta, WLAN_STA_PS_STA); |
d057e5a3 AN |
1143 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
1144 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 1145 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1146 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1147 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1148 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1149 | } | |
1150 | ||
ff9458d3 | 1151 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1152 | { |
571ecf67 | 1153 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1154 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
608383bf | 1155 | sta->sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1156 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1157 | |
c2c98fde | 1158 | if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1159 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1160 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
608383bf | 1161 | sta->sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1162 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1163 | return; |
1164 | } | |
1165 | ||
1166 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1167 | } |
1168 | ||
d057e5a3 AN |
1169 | int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) |
1170 | { | |
1171 | struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); | |
1172 | bool in_ps; | |
1173 | ||
1174 | WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); | |
1175 | ||
1176 | /* Don't let the same PS state be set twice */ | |
c2c98fde | 1177 | in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA); |
d057e5a3 AN |
1178 | if ((start && in_ps) || (!start && !in_ps)) |
1179 | return -EINVAL; | |
1180 | ||
1181 | if (start) | |
1182 | ap_sta_ps_start(sta_inf); | |
1183 | else | |
1184 | ap_sta_ps_end(sta_inf); | |
1185 | ||
1186 | return 0; | |
1187 | } | |
1188 | EXPORT_SYMBOL(ieee80211_sta_ps_transition); | |
1189 | ||
47086fc5 JB |
1190 | static ieee80211_rx_result debug_noinline |
1191 | ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) | |
1192 | { | |
1193 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
1194 | struct ieee80211_hdr *hdr = (void *)rx->skb->data; | |
1195 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
1196 | int tid, ac; | |
1197 | ||
1198 | if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
1199 | return RX_CONTINUE; | |
1200 | ||
1201 | if (sdata->vif.type != NL80211_IFTYPE_AP && | |
1202 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN) | |
1203 | return RX_CONTINUE; | |
1204 | ||
1205 | /* | |
1206 | * The device handles station powersave, so don't do anything about | |
1207 | * uAPSD and PS-Poll frames (the latter shouldn't even come up from | |
1208 | * it to mac80211 since they're handled.) | |
1209 | */ | |
1210 | if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
1211 | return RX_CONTINUE; | |
1212 | ||
1213 | /* | |
1214 | * Don't do anything if the station isn't already asleep. In | |
1215 | * the uAPSD case, the station will probably be marked asleep, | |
1216 | * in the PS-Poll case the station must be confused ... | |
1217 | */ | |
c2c98fde | 1218 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) |
47086fc5 JB |
1219 | return RX_CONTINUE; |
1220 | ||
1221 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { | |
c2c98fde JB |
1222 | if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { |
1223 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) | |
deeaee19 JB |
1224 | ieee80211_sta_ps_deliver_poll_response(rx->sta); |
1225 | else | |
c2c98fde | 1226 | set_sta_flag(rx->sta, WLAN_STA_PSPOLL); |
deeaee19 | 1227 | } |
47086fc5 JB |
1228 | |
1229 | /* Free PS Poll skb here instead of returning RX_DROP that would | |
1230 | * count as an dropped frame. */ | |
1231 | dev_kfree_skb(rx->skb); | |
1232 | ||
1233 | return RX_QUEUED; | |
1234 | } else if (!ieee80211_has_morefrags(hdr->frame_control) && | |
1235 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && | |
1236 | ieee80211_has_pm(hdr->frame_control) && | |
1237 | (ieee80211_is_data_qos(hdr->frame_control) || | |
1238 | ieee80211_is_qos_nullfunc(hdr->frame_control))) { | |
1239 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
1240 | ac = ieee802_1d_to_ac[tid & 7]; | |
1241 | ||
1242 | /* | |
1243 | * If this AC is not trigger-enabled do nothing. | |
1244 | * | |
1245 | * NB: This could/should check a separate bitmap of trigger- | |
1246 | * enabled queues, but for now we only implement uAPSD w/o | |
1247 | * TSPEC changes to the ACs, so they're always the same. | |
1248 | */ | |
1249 | if (!(rx->sta->sta.uapsd_queues & BIT(ac))) | |
1250 | return RX_CONTINUE; | |
1251 | ||
1252 | /* if we are in a service period, do nothing */ | |
c2c98fde | 1253 | if (test_sta_flag(rx->sta, WLAN_STA_SP)) |
47086fc5 JB |
1254 | return RX_CONTINUE; |
1255 | ||
c2c98fde | 1256 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) |
47086fc5 JB |
1257 | ieee80211_sta_ps_deliver_uapsd(rx->sta); |
1258 | else | |
c2c98fde | 1259 | set_sta_flag(rx->sta, WLAN_STA_UAPSD); |
47086fc5 JB |
1260 | } |
1261 | ||
1262 | return RX_CONTINUE; | |
1263 | } | |
1264 | ||
49461622 | 1265 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1266 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1267 | { |
1268 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1269 | struct sk_buff *skb = rx->skb; |
1270 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1271 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1272 | |
1273 | if (!sta) | |
9ae54c84 | 1274 | return RX_CONTINUE; |
571ecf67 | 1275 | |
b291ba11 JB |
1276 | /* |
1277 | * Update last_rx only for IBSS packets which are for the current | |
1278 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1279 | * where other STAs start using different BSSID. | |
1280 | */ | |
05c914fe | 1281 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1282 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1283 | NL80211_IFTYPE_ADHOC); |
3af6334c | 1284 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) { |
571ecf67 | 1285 | sta->last_rx = jiffies; |
3af6334c FF |
1286 | if (ieee80211_is_data(hdr->frame_control)) { |
1287 | sta->last_rx_rate_idx = status->rate_idx; | |
1288 | sta->last_rx_rate_flag = status->flag; | |
1289 | } | |
1290 | } | |
b291ba11 JB |
1291 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1292 | /* | |
33b64eb2 LCC |
1293 | * Mesh beacons will update last_rx when if they are found to |
1294 | * match the current local configuration when processed. | |
571ecf67 | 1295 | */ |
b291ba11 | 1296 | sta->last_rx = jiffies; |
3af6334c FF |
1297 | if (ieee80211_is_data(hdr->frame_control)) { |
1298 | sta->last_rx_rate_idx = status->rate_idx; | |
1299 | sta->last_rx_rate_flag = status->flag; | |
1300 | } | |
571ecf67 JB |
1301 | } |
1302 | ||
554891e6 | 1303 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1304 | return RX_CONTINUE; |
571ecf67 | 1305 | |
3cf335d5 KV |
1306 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1307 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1308 | ||
571ecf67 JB |
1309 | sta->rx_fragments++; |
1310 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1311 | sta->last_signal = status->signal; |
541a45a1 | 1312 | ewma_add(&sta->avg_signal, -status->signal); |
571ecf67 | 1313 | |
72eaa43a JB |
1314 | /* |
1315 | * Change STA power saving mode only at the end of a frame | |
1316 | * exchange sequence. | |
1317 | */ | |
d057e5a3 AN |
1318 | if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && |
1319 | !ieee80211_has_morefrags(hdr->frame_control) && | |
4cfda47b | 1320 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
05c914fe JB |
1321 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1322 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
c2c98fde | 1323 | if (test_sta_flag(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1324 | /* |
1325 | * Ignore doze->wake transitions that are | |
1326 | * indicated by non-data frames, the standard | |
1327 | * is unclear here, but for example going to | |
1328 | * PS mode and then scanning would cause a | |
1329 | * doze->wake transition for the probe request, | |
1330 | * and that is clearly undesirable. | |
1331 | */ | |
1332 | if (ieee80211_is_data(hdr->frame_control) && | |
1333 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1334 | ap_sta_ps_end(sta); |
72eaa43a JB |
1335 | } else { |
1336 | if (ieee80211_has_pm(hdr->frame_control)) | |
1337 | ap_sta_ps_start(sta); | |
1338 | } | |
571ecf67 JB |
1339 | } |
1340 | ||
22403def JB |
1341 | /* |
1342 | * Drop (qos-)data::nullfunc frames silently, since they | |
1343 | * are used only to control station power saving mode. | |
1344 | */ | |
1345 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1346 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1347 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1348 | |
1349 | /* | |
1350 | * If we receive a 4-addr nullfunc frame from a STA | |
e7f4a940 JB |
1351 | * that was not moved to a 4-addr STA vlan yet send |
1352 | * the event to userspace and for older hostapd drop | |
1353 | * the frame to the monitor interface. | |
d524215f FF |
1354 | */ |
1355 | if (ieee80211_has_a4(hdr->frame_control) && | |
1356 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1357 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
e7f4a940 JB |
1358 | !rx->sdata->u.vlan.sta))) { |
1359 | if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) | |
1360 | cfg80211_rx_unexpected_4addr_frame( | |
1361 | rx->sdata->dev, sta->sta.addr, | |
1362 | GFP_ATOMIC); | |
d524215f | 1363 | return RX_DROP_MONITOR; |
e7f4a940 | 1364 | } |
22403def JB |
1365 | /* |
1366 | * Update counter and free packet here to avoid | |
1367 | * counting this as a dropped packed. | |
1368 | */ | |
571ecf67 JB |
1369 | sta->rx_packets++; |
1370 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1371 | return RX_QUEUED; |
571ecf67 JB |
1372 | } |
1373 | ||
9ae54c84 | 1374 | return RX_CONTINUE; |
571ecf67 JB |
1375 | } /* ieee80211_rx_h_sta_process */ |
1376 | ||
571ecf67 JB |
1377 | static inline struct ieee80211_fragment_entry * |
1378 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1379 | unsigned int frag, unsigned int seq, int rx_queue, | |
1380 | struct sk_buff **skb) | |
1381 | { | |
1382 | struct ieee80211_fragment_entry *entry; | |
1383 | int idx; | |
1384 | ||
1385 | idx = sdata->fragment_next; | |
1386 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1387 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1388 | sdata->fragment_next = 0; | |
1389 | ||
1390 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1391 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1392 | struct ieee80211_hdr *hdr = |
1393 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1394 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1395 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1396 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1397 | sdata->name, idx, |
571ecf67 | 1398 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1399 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1400 | #endif |
571ecf67 JB |
1401 | __skb_queue_purge(&entry->skb_list); |
1402 | } | |
1403 | ||
1404 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1405 | *skb = NULL; | |
1406 | entry->first_frag_time = jiffies; | |
1407 | entry->seq = seq; | |
1408 | entry->rx_queue = rx_queue; | |
1409 | entry->last_frag = frag; | |
1410 | entry->ccmp = 0; | |
1411 | entry->extra_len = 0; | |
1412 | ||
1413 | return entry; | |
1414 | } | |
1415 | ||
1416 | static inline struct ieee80211_fragment_entry * | |
1417 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1418 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1419 | int rx_queue, struct ieee80211_hdr *hdr) |
1420 | { | |
1421 | struct ieee80211_fragment_entry *entry; | |
1422 | int i, idx; | |
1423 | ||
1424 | idx = sdata->fragment_next; | |
1425 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1426 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1427 | |
1428 | idx--; | |
1429 | if (idx < 0) | |
1430 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1431 | ||
1432 | entry = &sdata->fragments[idx]; | |
1433 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1434 | entry->rx_queue != rx_queue || | |
1435 | entry->last_frag + 1 != frag) | |
1436 | continue; | |
1437 | ||
b73d70ad | 1438 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1439 | |
b73d70ad HH |
1440 | /* |
1441 | * Check ftype and addresses are equal, else check next fragment | |
1442 | */ | |
1443 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1444 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1445 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1446 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1447 | continue; | |
1448 | ||
ab46623e | 1449 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1450 | __skb_queue_purge(&entry->skb_list); |
1451 | continue; | |
1452 | } | |
1453 | return entry; | |
1454 | } | |
1455 | ||
1456 | return NULL; | |
1457 | } | |
1458 | ||
49461622 | 1459 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1460 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1461 | { |
1462 | struct ieee80211_hdr *hdr; | |
1463 | u16 sc; | |
358c8d9d | 1464 | __le16 fc; |
571ecf67 JB |
1465 | unsigned int frag, seq; |
1466 | struct ieee80211_fragment_entry *entry; | |
1467 | struct sk_buff *skb; | |
554891e6 | 1468 | struct ieee80211_rx_status *status; |
571ecf67 | 1469 | |
b73d70ad | 1470 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1471 | fc = hdr->frame_control; |
571ecf67 JB |
1472 | sc = le16_to_cpu(hdr->seq_ctrl); |
1473 | frag = sc & IEEE80211_SCTL_FRAG; | |
1474 | ||
358c8d9d | 1475 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1476 | (rx->skb)->len < 24 || |
1477 | is_multicast_ether_addr(hdr->addr1))) { | |
1478 | /* not fragmented */ | |
1479 | goto out; | |
1480 | } | |
1481 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1482 | ||
e3cf8b3f ZY |
1483 | if (skb_linearize(rx->skb)) |
1484 | return RX_DROP_UNUSABLE; | |
1485 | ||
058897a4 AK |
1486 | /* |
1487 | * skb_linearize() might change the skb->data and | |
1488 | * previously cached variables (in this case, hdr) need to | |
1489 | * be refreshed with the new data. | |
1490 | */ | |
1491 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
571ecf67 JB |
1492 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1493 | ||
1494 | if (frag == 0) { | |
1495 | /* This is the first fragment of a new frame. */ | |
1496 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
9e26297a | 1497 | rx->seqno_idx, &(rx->skb)); |
97359d12 | 1498 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
358c8d9d | 1499 | ieee80211_has_protected(fc)) { |
9e26297a | 1500 | int queue = rx->security_idx; |
571ecf67 JB |
1501 | /* Store CCMP PN so that we can verify that the next |
1502 | * fragment has a sequential PN value. */ | |
1503 | entry->ccmp = 1; | |
1504 | memcpy(entry->last_pn, | |
9190252c | 1505 | rx->key->u.ccmp.rx_pn[queue], |
571ecf67 JB |
1506 | CCMP_PN_LEN); |
1507 | } | |
9ae54c84 | 1508 | return RX_QUEUED; |
571ecf67 JB |
1509 | } |
1510 | ||
1511 | /* This is a fragment for a frame that should already be pending in | |
1512 | * fragment cache. Add this fragment to the end of the pending entry. | |
1513 | */ | |
9e26297a JB |
1514 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, |
1515 | rx->seqno_idx, hdr); | |
571ecf67 JB |
1516 | if (!entry) { |
1517 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1518 | return RX_DROP_MONITOR; |
571ecf67 JB |
1519 | } |
1520 | ||
1521 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1522 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1523 | if (entry->ccmp) { | |
1524 | int i; | |
1525 | u8 pn[CCMP_PN_LEN], *rpn; | |
9190252c | 1526 | int queue; |
97359d12 | 1527 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) |
e4c26add | 1528 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1529 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1530 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1531 | pn[i]++; | |
1532 | if (pn[i]) | |
1533 | break; | |
1534 | } | |
9e26297a | 1535 | queue = rx->security_idx; |
9190252c | 1536 | rpn = rx->key->u.ccmp.rx_pn[queue]; |
f4ea83dd | 1537 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1538 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1539 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1540 | } | |
1541 | ||
358c8d9d | 1542 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1543 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1544 | entry->last_frag = frag; | |
1545 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1546 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1547 | rx->skb = NULL; |
9ae54c84 | 1548 | return RX_QUEUED; |
571ecf67 JB |
1549 | } |
1550 | ||
1551 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1552 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1553 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1554 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1555 | GFP_ATOMIC))) { | |
1556 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1557 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1558 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1559 | } |
1560 | } | |
1561 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1562 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1563 | dev_kfree_skb(skb); | |
1564 | } | |
1565 | ||
1566 | /* Complete frame has been reassembled - process it now */ | |
554891e6 JB |
1567 | status = IEEE80211_SKB_RXCB(rx->skb); |
1568 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
571ecf67 JB |
1569 | |
1570 | out: | |
1571 | if (rx->sta) | |
1572 | rx->sta->rx_packets++; | |
1573 | if (is_multicast_ether_addr(hdr->addr1)) | |
1574 | rx->local->dot11MulticastReceivedFrameCount++; | |
1575 | else | |
1576 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1577 | return RX_CONTINUE; |
571ecf67 JB |
1578 | } |
1579 | ||
76ee65bf | 1580 | static int |
5cf121c3 | 1581 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1582 | { |
07346f81 | 1583 | if (unlikely(!rx->sta || |
c2c98fde | 1584 | !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1585 | return -EACCES; |
571ecf67 | 1586 | |
76ee65bf | 1587 | return 0; |
571ecf67 JB |
1588 | } |
1589 | ||
76ee65bf | 1590 | static int |
358c8d9d | 1591 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1592 | { |
eb9fb5b8 JB |
1593 | struct sk_buff *skb = rx->skb; |
1594 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1595 | ||
3017b80b | 1596 | /* |
7848ba7d JB |
1597 | * Pass through unencrypted frames if the hardware has |
1598 | * decrypted them already. | |
3017b80b | 1599 | */ |
eb9fb5b8 | 1600 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1601 | return 0; |
571ecf67 JB |
1602 | |
1603 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1604 | if (unlikely(!ieee80211_has_protected(fc) && |
1605 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1606 | ieee80211_is_data(fc) && |
b3fc9c6c | 1607 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1608 | return -EACCES; |
bef5d1c7 JB |
1609 | |
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | static int | |
1614 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1615 | { | |
1616 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1617 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1618 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1619 | |
e3efca0a JM |
1620 | /* |
1621 | * Pass through unencrypted frames if the hardware has | |
1622 | * decrypted them already. | |
1623 | */ | |
1624 | if (status->flag & RX_FLAG_DECRYPTED) | |
1625 | return 0; | |
bef5d1c7 | 1626 | |
c2c98fde | 1627 | if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { |
d211e90e JM |
1628 | if (unlikely(!ieee80211_has_protected(fc) && |
1629 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
cf4e594e JM |
1630 | rx->key)) { |
1631 | if (ieee80211_is_deauth(fc)) | |
1632 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1633 | rx->skb->data, | |
1634 | rx->skb->len); | |
1635 | else if (ieee80211_is_disassoc(fc)) | |
1636 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1637 | rx->skb->data, | |
1638 | rx->skb->len); | |
f2ca3ea4 | 1639 | return -EACCES; |
cf4e594e | 1640 | } |
f2ca3ea4 | 1641 | /* BIP does not use Protected field, so need to check MMIE */ |
f64f9e71 | 1642 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
cf4e594e JM |
1643 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
1644 | if (ieee80211_is_deauth(fc)) | |
1645 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1646 | rx->skb->data, | |
1647 | rx->skb->len); | |
1648 | else if (ieee80211_is_disassoc(fc)) | |
1649 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1650 | rx->skb->data, | |
1651 | rx->skb->len); | |
f2ca3ea4 | 1652 | return -EACCES; |
cf4e594e | 1653 | } |
f2ca3ea4 JM |
1654 | /* |
1655 | * When using MFP, Action frames are not allowed prior to | |
1656 | * having configured keys. | |
1657 | */ | |
1658 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1659 | ieee80211_is_robust_mgmt_frame( | |
1660 | (struct ieee80211_hdr *) rx->skb->data))) | |
1661 | return -EACCES; | |
1662 | } | |
b3fc9c6c | 1663 | |
76ee65bf | 1664 | return 0; |
571ecf67 JB |
1665 | } |
1666 | ||
76ee65bf | 1667 | static int |
4114fa21 | 1668 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) |
571ecf67 | 1669 | { |
eb9fb5b8 | 1670 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee | 1671 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
fbb327c5 FF |
1672 | bool check_port_control = false; |
1673 | struct ethhdr *ehdr; | |
1674 | int ret; | |
f14543ee | 1675 | |
4114fa21 | 1676 | *port_control = false; |
9bc383de JB |
1677 | if (ieee80211_has_a4(hdr->frame_control) && |
1678 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1679 | return -1; |
9bc383de | 1680 | |
fbb327c5 FF |
1681 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
1682 | !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { | |
1683 | ||
1684 | if (!sdata->u.mgd.use_4addr) | |
1685 | return -1; | |
1686 | else | |
1687 | check_port_control = true; | |
1688 | } | |
1689 | ||
9bc383de | 1690 | if (is_multicast_ether_addr(hdr->addr1) && |
fbb327c5 | 1691 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) |
f14543ee | 1692 | return -1; |
571ecf67 | 1693 | |
fbb327c5 | 1694 | ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
4114fa21 | 1695 | if (ret < 0) |
fbb327c5 FF |
1696 | return ret; |
1697 | ||
1698 | ehdr = (struct ethhdr *) rx->skb->data; | |
4114fa21 FF |
1699 | if (ehdr->h_proto == rx->sdata->control_port_protocol) |
1700 | *port_control = true; | |
1701 | else if (check_port_control) | |
fbb327c5 FF |
1702 | return -1; |
1703 | ||
1704 | return 0; | |
76ee65bf | 1705 | } |
571ecf67 | 1706 | |
ce3edf6d JB |
1707 | /* |
1708 | * requires that rx->skb is a frame with ethernet header | |
1709 | */ | |
358c8d9d | 1710 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1711 | { |
c97c23e3 | 1712 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1713 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1714 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1715 | ||
1716 | /* | |
1717 | * Allow EAPOL frames to us/the PAE group address regardless | |
1718 | * of whether the frame was encrypted or not. | |
1719 | */ | |
a621fa4d | 1720 | if (ehdr->h_proto == rx->sdata->control_port_protocol && |
47846c9b | 1721 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1722 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1723 | return true; | |
1724 | ||
1725 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1726 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1727 | return false; |
1728 | ||
1729 | return true; | |
1730 | } | |
1731 | ||
1732 | /* | |
1733 | * requires that rx->skb is a frame with ethernet header | |
1734 | */ | |
76ee65bf | 1735 | static void |
5cf121c3 | 1736 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1737 | { |
eb9fb5b8 JB |
1738 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1739 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1740 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1741 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1742 | struct sta_info *dsta; | |
554891e6 | 1743 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
571ecf67 | 1744 | |
76ee65bf RR |
1745 | skb = rx->skb; |
1746 | xmit_skb = NULL; | |
571ecf67 | 1747 | |
05c914fe JB |
1748 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1749 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1750 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
554891e6 | 1751 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
9bc383de | 1752 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
ce3edf6d JB |
1753 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1754 | /* | |
1755 | * send multicast frames both to higher layers in | |
1756 | * local net stack and back to the wireless medium | |
1757 | */ | |
76ee65bf RR |
1758 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1759 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1760 | printk(KERN_DEBUG "%s: failed to clone " |
1761 | "multicast frame\n", dev->name); | |
1762 | } else { | |
abe60632 JB |
1763 | dsta = sta_info_get(sdata, skb->data); |
1764 | if (dsta) { | |
ce3edf6d JB |
1765 | /* |
1766 | * The destination station is associated to | |
1767 | * this AP (in this VLAN), so send the frame | |
1768 | * directly to it and do not pass it to local | |
1769 | * net stack. | |
571ecf67 | 1770 | */ |
76ee65bf | 1771 | xmit_skb = skb; |
571ecf67 JB |
1772 | skb = NULL; |
1773 | } | |
571ecf67 JB |
1774 | } |
1775 | } | |
1776 | ||
1777 | if (skb) { | |
d1c3a37c JB |
1778 | int align __maybe_unused; |
1779 | ||
59d9cb07 | 1780 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1781 | /* |
1782 | * 'align' will only take the values 0 or 2 here | |
1783 | * since all frames are required to be aligned | |
1784 | * to 2-byte boundaries when being passed to | |
1785 | * mac80211. That also explains the __skb_push() | |
1786 | * below. | |
1787 | */ | |
dacb6f1d | 1788 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1789 | if (align) { |
1790 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1791 | dev_kfree_skb(skb); | |
1792 | skb = NULL; | |
1793 | } else { | |
1794 | u8 *data = skb->data; | |
8ce0b589 ZY |
1795 | size_t len = skb_headlen(skb); |
1796 | skb->data -= align; | |
1797 | memmove(skb->data, data, len); | |
1798 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1799 | } |
1800 | } | |
1801 | #endif | |
1802 | ||
1803 | if (skb) { | |
1804 | /* deliver to local stack */ | |
1805 | skb->protocol = eth_type_trans(skb, dev); | |
1806 | memset(skb->cb, 0, sizeof(skb->cb)); | |
5548a8a1 | 1807 | netif_receive_skb(skb); |
d1c3a37c | 1808 | } |
571ecf67 JB |
1809 | } |
1810 | ||
76ee65bf | 1811 | if (xmit_skb) { |
aef6c928 HS |
1812 | /* |
1813 | * Send to wireless media and increase priority by 256 to | |
1814 | * keep the received priority instead of reclassifying | |
1815 | * the frame (see cfg80211_classify8021d). | |
1816 | */ | |
1817 | xmit_skb->priority += 256; | |
f831e909 | 1818 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1819 | skb_reset_network_header(xmit_skb); |
1820 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1821 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1822 | } |
76ee65bf RR |
1823 | } |
1824 | ||
49461622 | 1825 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1826 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1827 | { |
eb9fb5b8 | 1828 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1829 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1830 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1831 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1832 | struct sk_buff_head frame_list; |
554891e6 | 1833 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
fd4c7f2f | 1834 | |
358c8d9d | 1835 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1836 | return RX_CONTINUE; |
fd4c7f2f | 1837 | |
358c8d9d | 1838 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1839 | return RX_DROP_MONITOR; |
fd4c7f2f | 1840 | |
554891e6 | 1841 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1842 | return RX_CONTINUE; |
fd4c7f2f | 1843 | |
eaf85ca7 ZY |
1844 | if (ieee80211_has_a4(hdr->frame_control) && |
1845 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1846 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1847 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1848 | |
eaf85ca7 ZY |
1849 | if (is_multicast_ether_addr(hdr->addr1) && |
1850 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1851 | rx->sdata->u.vlan.sta) || | |
1852 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1853 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1854 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1855 | |
eaf85ca7 ZY |
1856 | skb->dev = dev; |
1857 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1858 | |
e3cf8b3f ZY |
1859 | if (skb_linearize(skb)) |
1860 | return RX_DROP_UNUSABLE; | |
1861 | ||
eaf85ca7 ZY |
1862 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1863 | rx->sdata->vif.type, | |
8b3becad | 1864 | rx->local->hw.extra_tx_headroom, true); |
fd4c7f2f | 1865 | |
eaf85ca7 ZY |
1866 | while (!skb_queue_empty(&frame_list)) { |
1867 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1868 | |
358c8d9d | 1869 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1870 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1871 | continue; |
1872 | } | |
eaf85ca7 ZY |
1873 | dev->stats.rx_packets++; |
1874 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1875 | |
1876 | ieee80211_deliver_skb(rx); | |
1877 | } | |
1878 | ||
9ae54c84 | 1879 | return RX_QUEUED; |
fd4c7f2f RR |
1880 | } |
1881 | ||
bf94e17b | 1882 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1883 | static ieee80211_rx_result |
e32f85f7 LCC |
1884 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1885 | { | |
30789eb6 TP |
1886 | struct ieee80211_hdr *fwd_hdr, *hdr; |
1887 | struct ieee80211_tx_info *info; | |
e32f85f7 | 1888 | struct ieee80211s_hdr *mesh_hdr; |
e32f85f7 | 1889 | struct sk_buff *skb = rx->skb, *fwd_skb; |
3b8d81e0 | 1890 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1891 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
554891e6 | 1892 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
30789eb6 | 1893 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
0cfda851 | 1894 | __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD); |
30789eb6 | 1895 | u16 q, hdrlen; |
e32f85f7 LCC |
1896 | |
1897 | hdr = (struct ieee80211_hdr *) skb->data; | |
1898 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1899 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1900 | ||
2157fdd6 TP |
1901 | /* frame is in RMC, don't forward */ |
1902 | if (ieee80211_is_data(hdr->frame_control) && | |
1903 | is_multicast_ether_addr(hdr->addr1) && | |
1904 | mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata)) | |
1905 | return RX_DROP_MONITOR; | |
1906 | ||
e32f85f7 LCC |
1907 | if (!ieee80211_is_data(hdr->frame_control)) |
1908 | return RX_CONTINUE; | |
1909 | ||
1910 | if (!mesh_hdr->ttl) | |
e32f85f7 LCC |
1911 | return RX_DROP_MONITOR; |
1912 | ||
43b7b314 | 1913 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1914 | struct mesh_path *mppath; |
43b7b314 JC |
1915 | char *proxied_addr; |
1916 | char *mpp_addr; | |
1917 | ||
1918 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1919 | mpp_addr = hdr->addr3; | |
1920 | proxied_addr = mesh_hdr->eaddr1; | |
1921 | } else { | |
1922 | mpp_addr = hdr->addr4; | |
1923 | proxied_addr = mesh_hdr->eaddr2; | |
1924 | } | |
79617dee | 1925 | |
79617dee | 1926 | rcu_read_lock(); |
43b7b314 | 1927 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1928 | if (!mppath) { |
43b7b314 | 1929 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1930 | } else { |
1931 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1932 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1933 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1934 | spin_unlock_bh(&mppath->state_lock); |
1935 | } | |
1936 | rcu_read_unlock(); | |
1937 | } | |
1938 | ||
3c5772a5 JC |
1939 | /* Frame has reached destination. Don't forward */ |
1940 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1941 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1942 | return RX_CONTINUE; |
1943 | ||
d3c1597b TP |
1944 | q = ieee80211_select_queue_80211(local, skb, hdr); |
1945 | if (ieee80211_queue_stopped(&local->hw, q)) { | |
30789eb6 | 1946 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); |
d3c1597b TP |
1947 | return RX_DROP_MONITOR; |
1948 | } | |
1949 | skb_set_queue_mapping(skb, q); | |
e32f85f7 | 1950 | |
30789eb6 TP |
1951 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
1952 | goto out; | |
c8a61a7d | 1953 | |
30789eb6 TP |
1954 | if (!--mesh_hdr->ttl) { |
1955 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); | |
1956 | return RX_DROP_MONITOR; | |
1957 | } | |
1958 | ||
1959 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1960 | if (!fwd_skb) { | |
1961 | if (net_ratelimit()) | |
1962 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1963 | sdata->name); | |
1964 | goto out; | |
1965 | } | |
1966 | ||
1967 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1968 | info = IEEE80211_SKB_CB(fwd_skb); | |
1969 | memset(info, 0, sizeof(*info)); | |
1970 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1971 | info->control.vif = &rx->sdata->vif; | |
1972 | info->control.jiffies = jiffies; | |
1973 | if (is_multicast_ether_addr(fwd_hdr->addr1)) { | |
1974 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); | |
1975 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1976 | } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) { | |
1977 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); | |
1978 | } else { | |
1979 | /* unable to resolve next hop */ | |
1980 | mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3, | |
1981 | 0, reason, fwd_hdr->addr2, sdata); | |
1982 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); | |
74b8cc3d | 1983 | kfree_skb(fwd_skb); |
30789eb6 | 1984 | return RX_DROP_MONITOR; |
e32f85f7 LCC |
1985 | } |
1986 | ||
30789eb6 TP |
1987 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); |
1988 | ieee80211_add_pending_skb(local, fwd_skb); | |
b51aff05 | 1989 | out: |
3c5772a5 | 1990 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1991 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1992 | return RX_CONTINUE; |
1993 | else | |
1994 | return RX_DROP_MONITOR; | |
1995 | } | |
bf94e17b | 1996 | #endif |
e32f85f7 | 1997 | |
49461622 | 1998 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1999 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 2000 | { |
eb9fb5b8 | 2001 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 2002 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 2003 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
2004 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
2005 | __le16 fc = hdr->frame_control; | |
4114fa21 | 2006 | bool port_control; |
ce3edf6d | 2007 | int err; |
76ee65bf | 2008 | |
358c8d9d | 2009 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 2010 | return RX_CONTINUE; |
76ee65bf | 2011 | |
358c8d9d | 2012 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 2013 | return RX_DROP_MONITOR; |
76ee65bf | 2014 | |
f14543ee | 2015 | /* |
e7f4a940 JB |
2016 | * Send unexpected-4addr-frame event to hostapd. For older versions, |
2017 | * also drop the frame to cooked monitor interfaces. | |
f14543ee FF |
2018 | */ |
2019 | if (ieee80211_has_a4(hdr->frame_control) && | |
e7f4a940 JB |
2020 | sdata->vif.type == NL80211_IFTYPE_AP) { |
2021 | if (rx->sta && | |
2022 | !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) | |
2023 | cfg80211_rx_unexpected_4addr_frame( | |
2024 | rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); | |
f14543ee | 2025 | return RX_DROP_MONITOR; |
e7f4a940 | 2026 | } |
f14543ee | 2027 | |
4114fa21 | 2028 | err = __ieee80211_data_to_8023(rx, &port_control); |
76ee65bf | 2029 | if (unlikely(err)) |
e4c26add | 2030 | return RX_DROP_UNUSABLE; |
76ee65bf | 2031 | |
358c8d9d | 2032 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 2033 | return RX_DROP_MONITOR; |
ce3edf6d | 2034 | |
4114fa21 FF |
2035 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
2036 | unlikely(port_control) && sdata->bss) { | |
2037 | sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, | |
2038 | u.ap); | |
2039 | dev = sdata->dev; | |
2040 | rx->sdata = sdata; | |
2041 | } | |
2042 | ||
76ee65bf RR |
2043 | rx->skb->dev = dev; |
2044 | ||
2045 | dev->stats.rx_packets++; | |
2046 | dev->stats.rx_bytes += rx->skb->len; | |
2047 | ||
08ca944e | 2048 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
8c99f691 RM |
2049 | !is_multicast_ether_addr( |
2050 | ((struct ethhdr *)rx->skb->data)->h_dest) && | |
2051 | (!local->scanning && | |
2052 | !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { | |
e15276a4 VN |
2053 | mod_timer(&local->dynamic_ps_timer, jiffies + |
2054 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
2055 | } | |
2056 | ||
76ee65bf | 2057 | ieee80211_deliver_skb(rx); |
571ecf67 | 2058 | |
9ae54c84 | 2059 | return RX_QUEUED; |
571ecf67 JB |
2060 | } |
2061 | ||
49461622 | 2062 | static ieee80211_rx_result debug_noinline |
24a8fdad | 2063 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
2064 | { |
2065 | struct ieee80211_local *local = rx->local; | |
2066 | struct ieee80211_hw *hw = &local->hw; | |
2067 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 2068 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
2069 | struct tid_ampdu_rx *tid_agg_rx; |
2070 | u16 start_seq_num; | |
2071 | u16 tid; | |
2072 | ||
a7767f95 | 2073 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 2074 | return RX_CONTINUE; |
71364716 | 2075 | |
a7767f95 | 2076 | if (ieee80211_is_back_req(bar->frame_control)) { |
8ae5977f JB |
2077 | struct { |
2078 | __le16 control, start_seq_num; | |
2079 | } __packed bar_data; | |
2080 | ||
71364716 | 2081 | if (!rx->sta) |
a02ae758 | 2082 | return RX_DROP_MONITOR; |
8ae5977f JB |
2083 | |
2084 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
2085 | &bar_data, sizeof(bar_data))) | |
2086 | return RX_DROP_MONITOR; | |
2087 | ||
8ae5977f | 2088 | tid = le16_to_cpu(bar_data.control) >> 12; |
a87f736d JB |
2089 | |
2090 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
2091 | if (!tid_agg_rx) | |
a02ae758 | 2092 | return RX_DROP_MONITOR; |
71364716 | 2093 | |
8ae5977f | 2094 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
71364716 RR |
2095 | |
2096 | /* reset session timer */ | |
20ad19d0 JB |
2097 | if (tid_agg_rx->timeout) |
2098 | mod_timer(&tid_agg_rx->session_timer, | |
2099 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 2100 | |
dd318575 | 2101 | spin_lock(&tid_agg_rx->reorder_lock); |
a02ae758 | 2102 | /* release stored frames up to start of BAR */ |
24a8fdad | 2103 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); |
dd318575 JB |
2104 | spin_unlock(&tid_agg_rx->reorder_lock); |
2105 | ||
a02ae758 JB |
2106 | kfree_skb(skb); |
2107 | return RX_QUEUED; | |
71364716 RR |
2108 | } |
2109 | ||
08daecae JB |
2110 | /* |
2111 | * After this point, we only want management frames, | |
2112 | * so we can drop all remaining control frames to | |
2113 | * cooked monitor interfaces. | |
2114 | */ | |
2115 | return RX_DROP_MONITOR; | |
71364716 RR |
2116 | } |
2117 | ||
f4f727a6 JM |
2118 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
2119 | struct ieee80211_mgmt *mgmt, | |
2120 | size_t len) | |
fea14732 JM |
2121 | { |
2122 | struct ieee80211_local *local = sdata->local; | |
2123 | struct sk_buff *skb; | |
2124 | struct ieee80211_mgmt *resp; | |
2125 | ||
47846c9b | 2126 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
2127 | /* Not to own unicast address */ |
2128 | return; | |
2129 | } | |
2130 | ||
46900298 JB |
2131 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
2132 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 2133 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
2134 | return; |
2135 | } | |
2136 | ||
2137 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2138 | /* Too short SA Query request frame */ | |
2139 | return; | |
2140 | } | |
2141 | ||
2142 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2143 | if (skb == NULL) | |
2144 | return; | |
2145 | ||
2146 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2147 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2148 | memset(resp, 0, 24); | |
2149 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 2150 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 2151 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
2152 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2153 | IEEE80211_STYPE_ACTION); | |
2154 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2155 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2156 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2157 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2158 | mgmt->u.action.u.sa_query.trans_id, | |
2159 | WLAN_SA_QUERY_TR_ID_LEN); | |
2160 | ||
62ae67be | 2161 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
2162 | } |
2163 | ||
2e161f78 JB |
2164 | static ieee80211_rx_result debug_noinline |
2165 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2166 | { | |
2167 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
554891e6 | 2168 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2169 | |
2170 | /* | |
2171 | * From here on, look only at management frames. | |
2172 | * Data and control frames are already handled, | |
2173 | * and unknown (reserved) frames are useless. | |
2174 | */ | |
2175 | if (rx->skb->len < 24) | |
2176 | return RX_DROP_MONITOR; | |
2177 | ||
2178 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2179 | return RX_DROP_MONITOR; | |
2180 | ||
ee971924 JB |
2181 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && |
2182 | ieee80211_is_beacon(mgmt->frame_control) && | |
2183 | !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { | |
ee971924 JB |
2184 | cfg80211_report_obss_beacon(rx->local->hw.wiphy, |
2185 | rx->skb->data, rx->skb->len, | |
2186 | status->freq, GFP_ATOMIC); | |
2187 | rx->flags |= IEEE80211_RX_BEACON_REPORTED; | |
2188 | } | |
2189 | ||
554891e6 | 2190 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
2e161f78 JB |
2191 | return RX_DROP_MONITOR; |
2192 | ||
2193 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2194 | return RX_DROP_UNUSABLE; | |
2195 | ||
2196 | return RX_CONTINUE; | |
2197 | } | |
2198 | ||
de1ede7a JB |
2199 | static ieee80211_rx_result debug_noinline |
2200 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2201 | { | |
2202 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 2203 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 2204 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
554891e6 | 2205 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
de1ede7a JB |
2206 | int len = rx->skb->len; |
2207 | ||
2208 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2209 | return RX_CONTINUE; | |
2210 | ||
026331c4 JM |
2211 | /* drop too small frames */ |
2212 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 2213 | return RX_DROP_UNUSABLE; |
de1ede7a | 2214 | |
026331c4 | 2215 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 2216 | return RX_DROP_UNUSABLE; |
de1ede7a | 2217 | |
554891e6 | 2218 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 2219 | return RX_DROP_UNUSABLE; |
97ebe12a | 2220 | |
de1ede7a | 2221 | switch (mgmt->u.action.category) { |
1d8d3dec JB |
2222 | case WLAN_CATEGORY_HT: |
2223 | /* reject HT action frames from stations not supporting HT */ | |
2224 | if (!rx->sta->sta.ht_cap.ht_supported) | |
2225 | goto invalid; | |
2226 | ||
2227 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2228 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && | |
2229 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2230 | sdata->vif.type != NL80211_IFTYPE_AP && | |
2231 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2232 | break; | |
2233 | ||
2234 | /* verify action & smps_control are present */ | |
2235 | if (len < IEEE80211_MIN_ACTION_SIZE + 2) | |
2236 | goto invalid; | |
2237 | ||
2238 | switch (mgmt->u.action.u.ht_smps.action) { | |
2239 | case WLAN_HT_ACTION_SMPS: { | |
2240 | struct ieee80211_supported_band *sband; | |
2241 | u8 smps; | |
2242 | ||
2243 | /* convert to HT capability */ | |
2244 | switch (mgmt->u.action.u.ht_smps.smps_control) { | |
2245 | case WLAN_HT_SMPS_CONTROL_DISABLED: | |
2246 | smps = WLAN_HT_CAP_SM_PS_DISABLED; | |
2247 | break; | |
2248 | case WLAN_HT_SMPS_CONTROL_STATIC: | |
2249 | smps = WLAN_HT_CAP_SM_PS_STATIC; | |
2250 | break; | |
2251 | case WLAN_HT_SMPS_CONTROL_DYNAMIC: | |
2252 | smps = WLAN_HT_CAP_SM_PS_DYNAMIC; | |
2253 | break; | |
2254 | default: | |
2255 | goto invalid; | |
2256 | } | |
2257 | smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT; | |
2258 | ||
2259 | /* if no change do nothing */ | |
2260 | if ((rx->sta->sta.ht_cap.cap & | |
2261 | IEEE80211_HT_CAP_SM_PS) == smps) | |
2262 | goto handled; | |
2263 | ||
2264 | rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS; | |
2265 | rx->sta->sta.ht_cap.cap |= smps; | |
2266 | ||
2267 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2268 | ||
2269 | rate_control_rate_update(local, sband, rx->sta, | |
2270 | IEEE80211_RC_SMPS_CHANGED, | |
2271 | local->_oper_channel_type); | |
2272 | goto handled; | |
2273 | } | |
2274 | default: | |
2275 | goto invalid; | |
2276 | } | |
2277 | ||
2278 | break; | |
de1ede7a | 2279 | case WLAN_CATEGORY_BACK: |
8abd3f9b | 2280 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
ae2772b3 | 2281 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
8abd3f9b | 2282 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
13c40c54 AS |
2283 | sdata->vif.type != NL80211_IFTYPE_AP && |
2284 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
84040805 | 2285 | break; |
8abd3f9b | 2286 | |
026331c4 JM |
2287 | /* verify action_code is present */ |
2288 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2289 | break; | |
2290 | ||
de1ede7a JB |
2291 | switch (mgmt->u.action.u.addba_req.action_code) { |
2292 | case WLAN_ACTION_ADDBA_REQ: | |
2293 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2294 | sizeof(mgmt->u.action.u.addba_req))) | |
bed7ee6e JB |
2295 | goto invalid; |
2296 | break; | |
de1ede7a JB |
2297 | case WLAN_ACTION_ADDBA_RESP: |
2298 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2299 | sizeof(mgmt->u.action.u.addba_resp))) | |
bed7ee6e JB |
2300 | goto invalid; |
2301 | break; | |
de1ede7a JB |
2302 | case WLAN_ACTION_DELBA: |
2303 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2304 | sizeof(mgmt->u.action.u.delba))) | |
bed7ee6e JB |
2305 | goto invalid; |
2306 | break; | |
2307 | default: | |
2308 | goto invalid; | |
de1ede7a | 2309 | } |
bed7ee6e | 2310 | |
8b58ff83 | 2311 | goto queue; |
39192c0b JB |
2312 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
2313 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 2314 | break; |
46900298 JB |
2315 | |
2316 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2317 | break; |
46900298 | 2318 | |
026331c4 JM |
2319 | /* verify action_code is present */ |
2320 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2321 | break; | |
2322 | ||
39192c0b JB |
2323 | switch (mgmt->u.action.u.measurement.action_code) { |
2324 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2325 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2326 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 2327 | break; |
39192c0b | 2328 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 2329 | goto handled; |
c481ec97 S |
2330 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
2331 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2332 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 2333 | break; |
c481ec97 | 2334 | |
cc32abd4 | 2335 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 2336 | break; |
cc32abd4 | 2337 | |
46900298 | 2338 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 2339 | break; |
c481ec97 | 2340 | |
8b58ff83 | 2341 | goto queue; |
39192c0b JB |
2342 | } |
2343 | break; | |
fea14732 JM |
2344 | case WLAN_CATEGORY_SA_QUERY: |
2345 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2346 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
2347 | break; |
2348 | ||
fea14732 JM |
2349 | switch (mgmt->u.action.u.sa_query.action) { |
2350 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2351 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 2352 | break; |
fea14732 | 2353 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 2354 | goto handled; |
fea14732 JM |
2355 | } |
2356 | break; | |
8db09850 TP |
2357 | case WLAN_CATEGORY_SELF_PROTECTED: |
2358 | switch (mgmt->u.action.u.self_prot.action_code) { | |
2359 | case WLAN_SP_MESH_PEERING_OPEN: | |
2360 | case WLAN_SP_MESH_PEERING_CLOSE: | |
2361 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
2362 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
2363 | goto invalid; | |
2364 | if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE) | |
2365 | /* userspace handles this frame */ | |
2366 | break; | |
2367 | goto queue; | |
2368 | case WLAN_SP_MGK_INFORM: | |
2369 | case WLAN_SP_MGK_ACK: | |
2370 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
2371 | goto invalid; | |
2372 | break; | |
2373 | } | |
2374 | break; | |
d3aaec8a | 2375 | case WLAN_CATEGORY_MESH_ACTION: |
77a121c3 JB |
2376 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
2377 | break; | |
25d49e4d TP |
2378 | if (mesh_action_is_path_sel(mgmt) && |
2379 | (!mesh_path_sel_is_hwmp(sdata))) | |
c7108a71 JC |
2380 | break; |
2381 | goto queue; | |
84040805 | 2382 | } |
026331c4 | 2383 | |
2e161f78 JB |
2384 | return RX_CONTINUE; |
2385 | ||
bed7ee6e | 2386 | invalid: |
554891e6 | 2387 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
2e161f78 JB |
2388 | /* will return in the next handlers */ |
2389 | return RX_CONTINUE; | |
2390 | ||
2391 | handled: | |
2392 | if (rx->sta) | |
2393 | rx->sta->rx_packets++; | |
2394 | dev_kfree_skb(rx->skb); | |
2395 | return RX_QUEUED; | |
2396 | ||
2397 | queue: | |
2398 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2399 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2400 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2401 | if (rx->sta) | |
2402 | rx->sta->rx_packets++; | |
2403 | return RX_QUEUED; | |
2404 | } | |
2405 | ||
2406 | static ieee80211_rx_result debug_noinline | |
2407 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2408 | { | |
554891e6 | 2409 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2410 | |
2411 | /* skip known-bad action frames and return them in the next handler */ | |
554891e6 | 2412 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
2e161f78 | 2413 | return RX_CONTINUE; |
d7907448 | 2414 | |
026331c4 JM |
2415 | /* |
2416 | * Getting here means the kernel doesn't know how to handle | |
2417 | * it, but maybe userspace does ... include returned frames | |
2418 | * so userspace can register for those to know whether ones | |
2419 | * it transmitted were processed or returned. | |
2420 | */ | |
026331c4 | 2421 | |
2e161f78 JB |
2422 | if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, |
2423 | rx->skb->data, rx->skb->len, | |
2424 | GFP_ATOMIC)) { | |
2425 | if (rx->sta) | |
2426 | rx->sta->rx_packets++; | |
2427 | dev_kfree_skb(rx->skb); | |
2428 | return RX_QUEUED; | |
2429 | } | |
2430 | ||
2431 | ||
2432 | return RX_CONTINUE; | |
2433 | } | |
2434 | ||
2435 | static ieee80211_rx_result debug_noinline | |
2436 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2437 | { | |
2438 | struct ieee80211_local *local = rx->local; | |
2439 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2440 | struct sk_buff *nskb; | |
2441 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
554891e6 | 2442 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
2e161f78 JB |
2443 | |
2444 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2445 | return RX_CONTINUE; | |
2446 | ||
2447 | /* | |
2448 | * For AP mode, hostapd is responsible for handling any action | |
2449 | * frames that we didn't handle, including returning unknown | |
2450 | * ones. For all other modes we will return them to the sender, | |
2451 | * setting the 0x80 bit in the action category, as required by | |
2452 | * 802.11-2007 7.3.1.11. | |
2453 | * Newer versions of hostapd shall also use the management frame | |
2454 | * registration mechanisms, but older ones still use cooked | |
2455 | * monitor interfaces so push all frames there. | |
2456 | */ | |
554891e6 | 2457 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
2e161f78 JB |
2458 | (sdata->vif.type == NL80211_IFTYPE_AP || |
2459 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2460 | return RX_DROP_MONITOR; | |
026331c4 | 2461 | |
84040805 JB |
2462 | /* do not return rejected action frames */ |
2463 | if (mgmt->u.action.category & 0x80) | |
2464 | return RX_DROP_UNUSABLE; | |
2465 | ||
2466 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2467 | GFP_ATOMIC); | |
2468 | if (nskb) { | |
292b4df6 | 2469 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
84040805 | 2470 | |
292b4df6 JL |
2471 | nmgmt->u.action.category |= 0x80; |
2472 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2473 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
84040805 JB |
2474 | |
2475 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2476 | ||
2477 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a | 2478 | } |
39192c0b JB |
2479 | dev_kfree_skb(rx->skb); |
2480 | return RX_QUEUED; | |
de1ede7a JB |
2481 | } |
2482 | ||
49461622 | 2483 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2484 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2485 | { |
eb9fb5b8 | 2486 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2487 | ieee80211_rx_result rxs; |
77a121c3 JB |
2488 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
2489 | __le16 stype; | |
571ecf67 | 2490 | |
af6b6374 JB |
2491 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2492 | if (rxs != RX_CONTINUE) | |
2493 | return rxs; | |
2494 | ||
77a121c3 | 2495 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
472dbc45 | 2496 | |
77a121c3 JB |
2497 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
2498 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2499 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2500 | return RX_DROP_MONITOR; | |
472dbc45 | 2501 | |
77a121c3 JB |
2502 | switch (stype) { |
2503 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2504 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2505 | /* process for all: mesh, mlme, ibss */ | |
2506 | break; | |
2507 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2508 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2c31333a CL |
2509 | if (is_multicast_ether_addr(mgmt->da) && |
2510 | !is_broadcast_ether_addr(mgmt->da)) | |
2511 | return RX_DROP_MONITOR; | |
2512 | ||
77a121c3 JB |
2513 | /* process only for station */ |
2514 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2515 | return RX_DROP_MONITOR; | |
2516 | break; | |
2517 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2518 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2519 | /* process only for ibss */ | |
2520 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2521 | return RX_DROP_MONITOR; | |
2522 | break; | |
2523 | default: | |
2524 | return RX_DROP_MONITOR; | |
2525 | } | |
f9d540ee | 2526 | |
77a121c3 | 2527 | /* queue up frame and kick off work to process it */ |
c1475ca9 | 2528 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
77a121c3 JB |
2529 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
2530 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
8b58ff83 JB |
2531 | if (rx->sta) |
2532 | rx->sta->rx_packets++; | |
46900298 | 2533 | |
77a121c3 | 2534 | return RX_QUEUED; |
571ecf67 JB |
2535 | } |
2536 | ||
5cf121c3 | 2537 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2538 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2539 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2540 | { |
2541 | struct ieee80211_sub_if_data *sdata; | |
2542 | struct ieee80211_local *local = rx->local; | |
2543 | struct ieee80211_rtap_hdr { | |
2544 | struct ieee80211_radiotap_header hdr; | |
2545 | u8 flags; | |
5f0b7de5 | 2546 | u8 rate_or_pad; |
3d30d949 MW |
2547 | __le16 chan_freq; |
2548 | __le16 chan_flags; | |
bc10502d | 2549 | } __packed *rthdr; |
3d30d949 MW |
2550 | struct sk_buff *skb = rx->skb, *skb2; |
2551 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2552 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2553 | |
554891e6 JB |
2554 | /* |
2555 | * If cooked monitor has been processed already, then | |
2556 | * don't do it again. If not, set the flag. | |
2557 | */ | |
2558 | if (rx->flags & IEEE80211_RX_CMNTR) | |
7c1e1831 | 2559 | goto out_free_skb; |
554891e6 | 2560 | rx->flags |= IEEE80211_RX_CMNTR; |
7c1e1831 | 2561 | |
152c477a JB |
2562 | /* If there are no cooked monitor interfaces, just free the SKB */ |
2563 | if (!local->cooked_mntrs) | |
2564 | goto out_free_skb; | |
2565 | ||
3d30d949 MW |
2566 | if (skb_headroom(skb) < sizeof(*rthdr) && |
2567 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2568 | goto out_free_skb; | |
2569 | ||
2570 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2571 | memset(rthdr, 0, sizeof(*rthdr)); | |
2572 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2573 | rthdr->hdr.it_present = | |
2574 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2575 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2576 | ||
5f0b7de5 JB |
2577 | if (rate) { |
2578 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2579 | rthdr->hdr.it_present |= | |
2580 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2581 | } | |
3d30d949 MW |
2582 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2583 | ||
2584 | if (status->band == IEEE80211_BAND_5GHZ) | |
2585 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2586 | IEEE80211_CHAN_5GHZ); | |
2587 | else | |
2588 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2589 | IEEE80211_CHAN_2GHZ); | |
2590 | ||
2591 | skb_set_mac_header(skb, 0); | |
2592 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2593 | skb->pkt_type = PACKET_OTHERHOST; | |
2594 | skb->protocol = htons(ETH_P_802_2); | |
2595 | ||
2596 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2597 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2598 | continue; |
2599 | ||
05c914fe | 2600 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2601 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2602 | continue; | |
2603 | ||
2604 | if (prev_dev) { | |
2605 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2606 | if (skb2) { | |
2607 | skb2->dev = prev_dev; | |
5548a8a1 | 2608 | netif_receive_skb(skb2); |
3d30d949 MW |
2609 | } |
2610 | } | |
2611 | ||
2612 | prev_dev = sdata->dev; | |
2613 | sdata->dev->stats.rx_packets++; | |
2614 | sdata->dev->stats.rx_bytes += skb->len; | |
2615 | } | |
2616 | ||
2617 | if (prev_dev) { | |
2618 | skb->dev = prev_dev; | |
5548a8a1 | 2619 | netif_receive_skb(skb); |
554891e6 JB |
2620 | return; |
2621 | } | |
3d30d949 MW |
2622 | |
2623 | out_free_skb: | |
2624 | dev_kfree_skb(skb); | |
2625 | } | |
2626 | ||
aa0c8636 CL |
2627 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
2628 | ieee80211_rx_result res) | |
2629 | { | |
2630 | switch (res) { | |
2631 | case RX_DROP_MONITOR: | |
2632 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2633 | if (rx->sta) | |
2634 | rx->sta->rx_dropped++; | |
2635 | /* fall through */ | |
2636 | case RX_CONTINUE: { | |
2637 | struct ieee80211_rate *rate = NULL; | |
2638 | struct ieee80211_supported_band *sband; | |
2639 | struct ieee80211_rx_status *status; | |
2640 | ||
2641 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2642 | ||
2643 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2644 | if (!(status->flag & RX_FLAG_HT)) | |
2645 | rate = &sband->bitrates[status->rate_idx]; | |
2646 | ||
2647 | ieee80211_rx_cooked_monitor(rx, rate); | |
2648 | break; | |
2649 | } | |
2650 | case RX_DROP_UNUSABLE: | |
2651 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2652 | if (rx->sta) | |
2653 | rx->sta->rx_dropped++; | |
2654 | dev_kfree_skb(rx->skb); | |
2655 | break; | |
2656 | case RX_QUEUED: | |
2657 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2658 | break; | |
2659 | } | |
2660 | } | |
571ecf67 | 2661 | |
24a8fdad | 2662 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) |
58905290 | 2663 | { |
58905290 | 2664 | ieee80211_rx_result res = RX_DROP_MONITOR; |
aa0c8636 | 2665 | struct sk_buff *skb; |
8944b79f | 2666 | |
e32f85f7 LCC |
2667 | #define CALL_RXH(rxh) \ |
2668 | do { \ | |
2669 | res = rxh(rx); \ | |
2670 | if (res != RX_CONTINUE) \ | |
2569a826 | 2671 | goto rxh_next; \ |
e32f85f7 | 2672 | } while (0); |
49461622 | 2673 | |
24a8fdad CL |
2674 | spin_lock(&rx->local->rx_skb_queue.lock); |
2675 | if (rx->local->running_rx_handler) | |
2676 | goto unlock; | |
2677 | ||
2678 | rx->local->running_rx_handler = true; | |
2679 | ||
2680 | while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { | |
2681 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2682 | ||
2569a826 JB |
2683 | /* |
2684 | * all the other fields are valid across frames | |
2685 | * that belong to an aMPDU since they are on the | |
2686 | * same TID from the same station | |
2687 | */ | |
2688 | rx->skb = skb; | |
2689 | ||
2690 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2691 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
47086fc5 | 2692 | CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll) |
2569a826 JB |
2693 | CALL_RXH(ieee80211_rx_h_sta_process) |
2694 | CALL_RXH(ieee80211_rx_h_defragment) | |
2569a826 JB |
2695 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) |
2696 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
bf94e17b | 2697 | #ifdef CONFIG_MAC80211_MESH |
aa0c8636 | 2698 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
2569a826 | 2699 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
bf94e17b | 2700 | #endif |
2154c81c | 2701 | CALL_RXH(ieee80211_rx_h_amsdu) |
2569a826 | 2702 | CALL_RXH(ieee80211_rx_h_data) |
24a8fdad | 2703 | CALL_RXH(ieee80211_rx_h_ctrl); |
2e161f78 | 2704 | CALL_RXH(ieee80211_rx_h_mgmt_check) |
2569a826 | 2705 | CALL_RXH(ieee80211_rx_h_action) |
2e161f78 JB |
2706 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) |
2707 | CALL_RXH(ieee80211_rx_h_action_return) | |
2569a826 | 2708 | CALL_RXH(ieee80211_rx_h_mgmt) |
49461622 | 2709 | |
aa0c8636 CL |
2710 | rxh_next: |
2711 | ieee80211_rx_handlers_result(rx, res); | |
24a8fdad | 2712 | spin_lock(&rx->local->rx_skb_queue.lock); |
49461622 | 2713 | #undef CALL_RXH |
aa0c8636 | 2714 | } |
24a8fdad CL |
2715 | |
2716 | rx->local->running_rx_handler = false; | |
2717 | ||
2718 | unlock: | |
2719 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
aa0c8636 CL |
2720 | } |
2721 | ||
4406c376 | 2722 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
aa0c8636 | 2723 | { |
aa0c8636 CL |
2724 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2725 | ||
aa0c8636 CL |
2726 | #define CALL_RXH(rxh) \ |
2727 | do { \ | |
2728 | res = rxh(rx); \ | |
2729 | if (res != RX_CONTINUE) \ | |
2730 | goto rxh_next; \ | |
2731 | } while (0); | |
2732 | ||
2733 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2734 | CALL_RXH(ieee80211_rx_h_check) | |
2735 | ||
24a8fdad | 2736 | ieee80211_rx_reorder_ampdu(rx); |
aa0c8636 | 2737 | |
24a8fdad | 2738 | ieee80211_rx_handlers(rx); |
aa0c8636 | 2739 | return; |
49461622 | 2740 | |
2569a826 | 2741 | rxh_next: |
aa0c8636 CL |
2742 | ieee80211_rx_handlers_result(rx, res); |
2743 | ||
2744 | #undef CALL_RXH | |
58905290 JB |
2745 | } |
2746 | ||
2bff8ebf | 2747 | /* |
dd318575 JB |
2748 | * This function makes calls into the RX path, therefore |
2749 | * it has to be invoked under RCU read lock. | |
2bff8ebf CL |
2750 | */ |
2751 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2752 | { | |
554891e6 JB |
2753 | struct ieee80211_rx_data rx = { |
2754 | .sta = sta, | |
2755 | .sdata = sta->sdata, | |
2756 | .local = sta->local, | |
9e26297a JB |
2757 | /* This is OK -- must be QoS data frame */ |
2758 | .security_idx = tid, | |
2759 | .seqno_idx = tid, | |
fcf8bd3b | 2760 | .flags = 0, |
554891e6 | 2761 | }; |
2c15a0cf CL |
2762 | struct tid_ampdu_rx *tid_agg_rx; |
2763 | ||
2764 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2765 | if (!tid_agg_rx) | |
2766 | return; | |
2bff8ebf | 2767 | |
2c15a0cf | 2768 | spin_lock(&tid_agg_rx->reorder_lock); |
24a8fdad | 2769 | ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); |
2c15a0cf | 2770 | spin_unlock(&tid_agg_rx->reorder_lock); |
2bff8ebf | 2771 | |
24a8fdad | 2772 | ieee80211_rx_handlers(&rx); |
2bff8ebf CL |
2773 | } |
2774 | ||
571ecf67 JB |
2775 | /* main receive path */ |
2776 | ||
20b01f80 | 2777 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
23a24def JB |
2778 | struct ieee80211_hdr *hdr) |
2779 | { | |
20b01f80 | 2780 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
eb9fb5b8 JB |
2781 | struct sk_buff *skb = rx->skb; |
2782 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2783 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2784 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2785 | ||
51fb61e7 | 2786 | switch (sdata->vif.type) { |
05c914fe | 2787 | case NL80211_IFTYPE_STATION: |
9bc383de | 2788 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2789 | return 0; |
77fdaa12 | 2790 | if (!multicast && |
47846c9b | 2791 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4f312336 FF |
2792 | if (!(sdata->dev->flags & IFF_PROMISC) || |
2793 | sdata->u.mgd.use_4addr) | |
23a24def | 2794 | return 0; |
554891e6 | 2795 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2796 | } |
2797 | break; | |
05c914fe | 2798 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2799 | if (!bssid) |
2800 | return 0; | |
a7767f95 | 2801 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2802 | return 1; |
87291c02 | 2803 | } |
46900298 | 2804 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
554891e6 | 2805 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2806 | return 0; |
554891e6 | 2807 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2808 | } else if (!multicast && |
47846c9b | 2809 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2810 | hdr->addr1) != 0) { |
4150c572 | 2811 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2812 | return 0; |
554891e6 | 2813 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2814 | } else if (!rx->sta) { |
2815 | int rate_idx; | |
eb9fb5b8 | 2816 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2817 | rate_idx = 0; /* TODO: HT rates */ |
2818 | else | |
eb9fb5b8 | 2819 | rate_idx = status->rate_idx; |
8bf11d8d JB |
2820 | ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, |
2821 | BIT(rate_idx)); | |
0fb8ca45 | 2822 | } |
23a24def | 2823 | break; |
05c914fe | 2824 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2825 | if (!multicast && |
47846c9b | 2826 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2827 | hdr->addr1) != 0) { |
2828 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2829 | return 0; | |
2830 | ||
554891e6 | 2831 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2832 | } |
2833 | break; | |
05c914fe JB |
2834 | case NL80211_IFTYPE_AP_VLAN: |
2835 | case NL80211_IFTYPE_AP: | |
23a24def | 2836 | if (!bssid) { |
47846c9b | 2837 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2838 | hdr->addr1)) |
2839 | return 0; | |
2840 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2841 | sdata->vif.addr)) { |
3df6eaea JB |
2842 | /* |
2843 | * Accept public action frames even when the | |
2844 | * BSSID doesn't match, this is used for P2P | |
2845 | * and location updates. Note that mac80211 | |
2846 | * itself never looks at these frames. | |
2847 | */ | |
2848 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && | |
2849 | ieee80211_is_public_action(hdr, skb->len)) | |
2850 | return 1; | |
771bbd09 | 2851 | if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && |
3df6eaea | 2852 | !ieee80211_is_beacon(hdr->frame_control)) |
23a24def | 2853 | return 0; |
554891e6 | 2854 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2855 | } |
23a24def | 2856 | break; |
05c914fe | 2857 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2858 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2859 | return 0; |
2860 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2861 | return 0; | |
2862 | break; | |
2ca27bcf | 2863 | default: |
fb1c1cd6 JB |
2864 | /* should never get here */ |
2865 | WARN_ON(1); | |
2866 | break; | |
23a24def JB |
2867 | } |
2868 | ||
2869 | return 1; | |
2870 | } | |
2871 | ||
4406c376 JB |
2872 | /* |
2873 | * This function returns whether or not the SKB | |
2874 | * was destined for RX processing or not, which, | |
2875 | * if consume is true, is equivalent to whether | |
2876 | * or not the skb was consumed. | |
2877 | */ | |
2878 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2879 | struct sk_buff *skb, bool consume) | |
2880 | { | |
2881 | struct ieee80211_local *local = rx->local; | |
2882 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2883 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2884 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2885 | int prepares; | |
2886 | ||
2887 | rx->skb = skb; | |
554891e6 | 2888 | status->rx_flags |= IEEE80211_RX_RA_MATCH; |
4406c376 JB |
2889 | prepares = prepare_for_handlers(rx, hdr); |
2890 | ||
2891 | if (!prepares) | |
2892 | return false; | |
2893 | ||
4406c376 JB |
2894 | if (!consume) { |
2895 | skb = skb_copy(skb, GFP_ATOMIC); | |
2896 | if (!skb) { | |
2897 | if (net_ratelimit()) | |
2898 | wiphy_debug(local->hw.wiphy, | |
b305dae4 | 2899 | "failed to copy skb for %s\n", |
4406c376 JB |
2900 | sdata->name); |
2901 | return true; | |
2902 | } | |
2903 | ||
2904 | rx->skb = skb; | |
2905 | } | |
2906 | ||
2907 | ieee80211_invoke_rx_handlers(rx); | |
2908 | return true; | |
2909 | } | |
2910 | ||
571ecf67 | 2911 | /* |
6368e4b1 RR |
2912 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2913 | * be called with rcu_read_lock protection. | |
571ecf67 | 2914 | */ |
71ebb4aa | 2915 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
071d9ac2 | 2916 | struct sk_buff *skb) |
571ecf67 | 2917 | { |
554891e6 | 2918 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2919 | struct ieee80211_local *local = hw_to_local(hw); |
2920 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2921 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2922 | __le16 fc; |
5cf121c3 | 2923 | struct ieee80211_rx_data rx; |
4406c376 | 2924 | struct ieee80211_sub_if_data *prev; |
56af3268 | 2925 | struct sta_info *sta, *tmp, *prev_sta; |
e3cf8b3f | 2926 | int err = 0; |
571ecf67 | 2927 | |
e3cf8b3f | 2928 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2929 | memset(&rx, 0, sizeof(rx)); |
2930 | rx.skb = skb; | |
2931 | rx.local = local; | |
72abd81b | 2932 | |
e3cf8b3f | 2933 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2934 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2935 | |
142b9f50 | 2936 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
b23b025f | 2937 | test_bit(SCAN_SW_SCANNING, &local->scanning))) |
554891e6 | 2938 | status->rx_flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2939 | |
e3cf8b3f ZY |
2940 | if (ieee80211_is_mgmt(fc)) |
2941 | err = skb_linearize(skb); | |
2942 | else | |
2943 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2944 | ||
2945 | if (err) { | |
2946 | dev_kfree_skb(skb); | |
2947 | return; | |
2948 | } | |
2949 | ||
2950 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2951 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2952 | ieee80211_verify_alignment(&rx); |
38f3714d | 2953 | |
e3cf8b3f | 2954 | if (ieee80211_is_data(fc)) { |
56af3268 | 2955 | prev_sta = NULL; |
4406c376 | 2956 | |
7852e361 | 2957 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
56af3268 BG |
2958 | if (!prev_sta) { |
2959 | prev_sta = sta; | |
2960 | continue; | |
2961 | } | |
2962 | ||
2963 | rx.sta = prev_sta; | |
2964 | rx.sdata = prev_sta->sdata; | |
4406c376 | 2965 | ieee80211_prepare_and_rx_handle(&rx, skb, false); |
abe60632 | 2966 | |
56af3268 | 2967 | prev_sta = sta; |
4406c376 | 2968 | } |
56af3268 BG |
2969 | |
2970 | if (prev_sta) { | |
2971 | rx.sta = prev_sta; | |
2972 | rx.sdata = prev_sta->sdata; | |
2973 | ||
4406c376 | 2974 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
56af3268 | 2975 | return; |
8e26d5ad | 2976 | goto out; |
56af3268 | 2977 | } |
4406c376 JB |
2978 | } |
2979 | ||
4b0dd98e | 2980 | prev = NULL; |
b2e7771e | 2981 | |
4b0dd98e JB |
2982 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2983 | if (!ieee80211_sdata_running(sdata)) | |
2984 | continue; | |
340e11f3 | 2985 | |
4b0dd98e JB |
2986 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2987 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2988 | continue; | |
340e11f3 | 2989 | |
4b0dd98e JB |
2990 | /* |
2991 | * frame is destined for this interface, but if it's | |
2992 | * not also for the previous one we handle that after | |
2993 | * the loop to avoid copying the SKB once too much | |
2994 | */ | |
4bb29f8c | 2995 | |
4b0dd98e | 2996 | if (!prev) { |
abe60632 | 2997 | prev = sdata; |
4b0dd98e | 2998 | continue; |
340e11f3 | 2999 | } |
4bb29f8c | 3000 | |
7852e361 | 3001 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4b0dd98e JB |
3002 | rx.sdata = prev; |
3003 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
4bb29f8c | 3004 | |
4b0dd98e JB |
3005 | prev = sdata; |
3006 | } | |
3007 | ||
3008 | if (prev) { | |
7852e361 | 3009 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4b0dd98e | 3010 | rx.sdata = prev; |
4406c376 | 3011 | |
4b0dd98e JB |
3012 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
3013 | return; | |
571ecf67 | 3014 | } |
4406c376 | 3015 | |
8e26d5ad | 3016 | out: |
4406c376 | 3017 | dev_kfree_skb(skb); |
571ecf67 | 3018 | } |
6368e4b1 RR |
3019 | |
3020 | /* | |
3021 | * This is the receive path handler. It is called by a low level driver when an | |
3022 | * 802.11 MPDU is received from the hardware. | |
3023 | */ | |
103bf9f7 | 3024 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
3025 | { |
3026 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
3027 | struct ieee80211_rate *rate = NULL; |
3028 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 3029 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 3030 | |
d20ef63d JB |
3031 | WARN_ON_ONCE(softirq_count() == 0); |
3032 | ||
77a980dc JB |
3033 | if (WARN_ON(status->band < 0 || |
3034 | status->band >= IEEE80211_NUM_BANDS)) | |
3035 | goto drop; | |
8318d78a JB |
3036 | |
3037 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
3038 | if (WARN_ON(!sband)) |
3039 | goto drop; | |
8318d78a | 3040 | |
89c3a8ac JB |
3041 | /* |
3042 | * If we're suspending, it is possible although not too likely | |
3043 | * that we'd be receiving frames after having already partially | |
3044 | * quiesced the stack. We can't process such frames then since | |
3045 | * that might, for example, cause stations to be added or other | |
3046 | * driver callbacks be invoked. | |
3047 | */ | |
77a980dc JB |
3048 | if (unlikely(local->quiescing || local->suspended)) |
3049 | goto drop; | |
89c3a8ac | 3050 | |
ea77f12f JB |
3051 | /* |
3052 | * The same happens when we're not even started, | |
3053 | * but that's worth a warning. | |
3054 | */ | |
77a980dc JB |
3055 | if (WARN_ON(!local->started)) |
3056 | goto drop; | |
ea77f12f | 3057 | |
fc885189 | 3058 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
e5d6eb83 | 3059 | /* |
fc885189 JB |
3060 | * Validate the rate, unless a PLCP error means that |
3061 | * we probably can't have a valid rate here anyway. | |
e5d6eb83 | 3062 | */ |
fc885189 JB |
3063 | |
3064 | if (status->flag & RX_FLAG_HT) { | |
3065 | /* | |
3066 | * rate_idx is MCS index, which can be [0-76] | |
3067 | * as documented on: | |
3068 | * | |
3069 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
3070 | * | |
3071 | * Anything else would be some sort of driver or | |
3072 | * hardware error. The driver should catch hardware | |
3073 | * errors. | |
3074 | */ | |
3075 | if (WARN((status->rate_idx < 0 || | |
3076 | status->rate_idx > 76), | |
3077 | "Rate marked as an HT rate but passed " | |
3078 | "status->rate_idx is not " | |
3079 | "an MCS index [0-76]: %d (0x%02x)\n", | |
3080 | status->rate_idx, | |
3081 | status->rate_idx)) | |
3082 | goto drop; | |
3083 | } else { | |
3084 | if (WARN_ON(status->rate_idx < 0 || | |
3085 | status->rate_idx >= sband->n_bitrates)) | |
3086 | goto drop; | |
3087 | rate = &sband->bitrates[status->rate_idx]; | |
3088 | } | |
0fb8ca45 | 3089 | } |
6368e4b1 | 3090 | |
554891e6 JB |
3091 | status->rx_flags = 0; |
3092 | ||
6368e4b1 RR |
3093 | /* |
3094 | * key references and virtual interfaces are protected using RCU | |
3095 | * and this requires that we are in a read-side RCU section during | |
3096 | * receive processing | |
3097 | */ | |
3098 | rcu_read_lock(); | |
3099 | ||
3100 | /* | |
3101 | * Frames with failed FCS/PLCP checksum are not returned, | |
3102 | * all other frames are returned without radiotap header | |
3103 | * if it was previously present. | |
3104 | * Also, frames with less than 16 bytes are dropped. | |
3105 | */ | |
f1d58c25 | 3106 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
3107 | if (!skb) { |
3108 | rcu_read_unlock(); | |
3109 | return; | |
3110 | } | |
3111 | ||
e1e54068 JB |
3112 | ieee80211_tpt_led_trig_rx(local, |
3113 | ((struct ieee80211_hdr *)skb->data)->frame_control, | |
3114 | skb->len); | |
071d9ac2 | 3115 | __ieee80211_rx_handle_packet(hw, skb); |
6368e4b1 RR |
3116 | |
3117 | rcu_read_unlock(); | |
77a980dc JB |
3118 | |
3119 | return; | |
3120 | drop: | |
3121 | kfree_skb(skb); | |
6368e4b1 | 3122 | } |
103bf9f7 | 3123 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
3124 | |
3125 | /* This is a version of the rx handler that can be called from hard irq | |
3126 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 3127 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
3128 | { |
3129 | struct ieee80211_local *local = hw_to_local(hw); | |
3130 | ||
3131 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
3132 | ||
571ecf67 JB |
3133 | skb->pkt_type = IEEE80211_RX_MSG; |
3134 | skb_queue_tail(&local->skb_queue, skb); | |
3135 | tasklet_schedule(&local->tasklet); | |
3136 | } | |
3137 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |