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1 | /* | |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> | |
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 | ||
12 | #include <linux/jiffies.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/rcupdate.h> | |
19 | #include <linux/export.h> | |
20 | #include <net/mac80211.h> | |
21 | #include <net/ieee80211_radiotap.h> | |
22 | #include <asm/unaligned.h> | |
23 | ||
24 | #include "ieee80211_i.h" | |
25 | #include "driver-ops.h" | |
26 | #include "led.h" | |
27 | #include "mesh.h" | |
28 | #include "wep.h" | |
29 | #include "wpa.h" | |
30 | #include "tkip.h" | |
31 | #include "wme.h" | |
32 | #include "rate.h" | |
33 | ||
34 | /* | |
35 | * monitor mode reception | |
36 | * | |
37 | * This function cleans up the SKB, i.e. it removes all the stuff | |
38 | * only useful for monitoring. | |
39 | */ | |
40 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
41 | struct sk_buff *skb) | |
42 | { | |
43 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
44 | ||
45 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
46 | if (likely(skb->len > FCS_LEN)) | |
47 | __pskb_trim(skb, skb->len - FCS_LEN); | |
48 | else { | |
49 | /* driver bug */ | |
50 | WARN_ON(1); | |
51 | dev_kfree_skb(skb); | |
52 | skb = NULL; | |
53 | } | |
54 | } | |
55 | ||
56 | if (status->vendor_radiotap_len) | |
57 | __pskb_pull(skb, status->vendor_radiotap_len); | |
58 | ||
59 | return skb; | |
60 | } | |
61 | ||
62 | static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len) | |
63 | { | |
64 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
65 | struct ieee80211_hdr *hdr; | |
66 | ||
67 | hdr = (void *)(skb->data + status->vendor_radiotap_len); | |
68 | ||
69 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | | |
70 | RX_FLAG_FAILED_PLCP_CRC | | |
71 | RX_FLAG_AMPDU_IS_ZEROLEN)) | |
72 | return 1; | |
73 | if (unlikely(skb->len < 16 + present_fcs_len + | |
74 | status->vendor_radiotap_len)) | |
75 | return 1; | |
76 | if (ieee80211_is_ctl(hdr->frame_control) && | |
77 | !ieee80211_is_pspoll(hdr->frame_control) && | |
78 | !ieee80211_is_back_req(hdr->frame_control)) | |
79 | return 1; | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static int | |
84 | ieee80211_rx_radiotap_space(struct ieee80211_local *local, | |
85 | struct ieee80211_rx_status *status) | |
86 | { | |
87 | int len; | |
88 | ||
89 | /* always present fields */ | |
90 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
91 | ||
92 | /* allocate extra bitmap */ | |
93 | if (status->vendor_radiotap_len) | |
94 | len += 4; | |
95 | ||
96 | if (ieee80211_have_rx_timestamp(status)) { | |
97 | len = ALIGN(len, 8); | |
98 | len += 8; | |
99 | } | |
100 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
101 | len += 1; | |
102 | ||
103 | /* padding for RX_FLAGS if necessary */ | |
104 | len = ALIGN(len, 2); | |
105 | ||
106 | if (status->flag & RX_FLAG_HT) /* HT info */ | |
107 | len += 3; | |
108 | ||
109 | if (status->flag & RX_FLAG_AMPDU_DETAILS) { | |
110 | len = ALIGN(len, 4); | |
111 | len += 8; | |
112 | } | |
113 | ||
114 | if (status->vendor_radiotap_len) { | |
115 | if (WARN_ON_ONCE(status->vendor_radiotap_align == 0)) | |
116 | status->vendor_radiotap_align = 1; | |
117 | /* align standard part of vendor namespace */ | |
118 | len = ALIGN(len, 2); | |
119 | /* allocate standard part of vendor namespace */ | |
120 | len += 6; | |
121 | /* align vendor-defined part */ | |
122 | len = ALIGN(len, status->vendor_radiotap_align); | |
123 | /* vendor-defined part is already in skb */ | |
124 | } | |
125 | ||
126 | return len; | |
127 | } | |
128 | ||
129 | /* | |
130 | * ieee80211_add_rx_radiotap_header - add radiotap header | |
131 | * | |
132 | * add a radiotap header containing all the fields which the hardware provided. | |
133 | */ | |
134 | static void | |
135 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
136 | struct sk_buff *skb, | |
137 | struct ieee80211_rate *rate, | |
138 | int rtap_len, bool has_fcs) | |
139 | { | |
140 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
141 | struct ieee80211_radiotap_header *rthdr; | |
142 | unsigned char *pos; | |
143 | u16 rx_flags = 0; | |
144 | int mpdulen; | |
145 | ||
146 | mpdulen = skb->len; | |
147 | if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))) | |
148 | mpdulen += FCS_LEN; | |
149 | ||
150 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
151 | memset(rthdr, 0, rtap_len); | |
152 | ||
153 | /* radiotap header, set always present flags */ | |
154 | rthdr->it_present = | |
155 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
156 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
157 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
158 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
159 | rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len); | |
160 | ||
161 | pos = (unsigned char *)(rthdr + 1); | |
162 | ||
163 | if (status->vendor_radiotap_len) { | |
164 | rthdr->it_present |= | |
165 | cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) | | |
166 | cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT)); | |
167 | put_unaligned_le32(status->vendor_radiotap_bitmap, pos); | |
168 | pos += 4; | |
169 | } | |
170 | ||
171 | /* the order of the following fields is important */ | |
172 | ||
173 | /* IEEE80211_RADIOTAP_TSFT */ | |
174 | if (ieee80211_have_rx_timestamp(status)) { | |
175 | /* padding */ | |
176 | while ((pos - (u8 *)rthdr) & 7) | |
177 | *pos++ = 0; | |
178 | put_unaligned_le64( | |
179 | ieee80211_calculate_rx_timestamp(local, status, | |
180 | mpdulen, 0), | |
181 | pos); | |
182 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
183 | pos += 8; | |
184 | } | |
185 | ||
186 | /* IEEE80211_RADIOTAP_FLAGS */ | |
187 | if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)) | |
188 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
189 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
190 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
191 | if (status->flag & RX_FLAG_SHORTPRE) | |
192 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
193 | pos++; | |
194 | ||
195 | /* IEEE80211_RADIOTAP_RATE */ | |
196 | if (!rate || status->flag & RX_FLAG_HT) { | |
197 | /* | |
198 | * Without rate information don't add it. If we have, | |
199 | * MCS information is a separate field in radiotap, | |
200 | * added below. The byte here is needed as padding | |
201 | * for the channel though, so initialise it to 0. | |
202 | */ | |
203 | *pos = 0; | |
204 | } else { | |
205 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
206 | *pos = rate->bitrate / 5; | |
207 | } | |
208 | pos++; | |
209 | ||
210 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
211 | put_unaligned_le16(status->freq, pos); | |
212 | pos += 2; | |
213 | if (status->band == IEEE80211_BAND_5GHZ) | |
214 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, | |
215 | pos); | |
216 | else if (status->flag & RX_FLAG_HT) | |
217 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
218 | pos); | |
219 | else if (rate && rate->flags & IEEE80211_RATE_ERP_G) | |
220 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, | |
221 | pos); | |
222 | else if (rate) | |
223 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, | |
224 | pos); | |
225 | else | |
226 | put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos); | |
227 | pos += 2; | |
228 | ||
229 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
230 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM && | |
231 | !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { | |
232 | *pos = status->signal; | |
233 | rthdr->it_present |= | |
234 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
235 | pos++; | |
236 | } | |
237 | ||
238 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
239 | ||
240 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
241 | *pos = status->antenna; | |
242 | pos++; | |
243 | ||
244 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
245 | ||
246 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
247 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
248 | if ((pos - (u8 *)rthdr) & 1) | |
249 | *pos++ = 0; | |
250 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) | |
251 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; | |
252 | put_unaligned_le16(rx_flags, pos); | |
253 | pos += 2; | |
254 | ||
255 | if (status->flag & RX_FLAG_HT) { | |
256 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); | |
257 | *pos++ = local->hw.radiotap_mcs_details; | |
258 | *pos = 0; | |
259 | if (status->flag & RX_FLAG_SHORT_GI) | |
260 | *pos |= IEEE80211_RADIOTAP_MCS_SGI; | |
261 | if (status->flag & RX_FLAG_40MHZ) | |
262 | *pos |= IEEE80211_RADIOTAP_MCS_BW_40; | |
263 | if (status->flag & RX_FLAG_HT_GF) | |
264 | *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; | |
265 | pos++; | |
266 | *pos++ = status->rate_idx; | |
267 | } | |
268 | ||
269 | if (status->flag & RX_FLAG_AMPDU_DETAILS) { | |
270 | u16 flags = 0; | |
271 | ||
272 | /* ensure 4 byte alignment */ | |
273 | while ((pos - (u8 *)rthdr) & 3) | |
274 | pos++; | |
275 | rthdr->it_present |= | |
276 | cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); | |
277 | put_unaligned_le32(status->ampdu_reference, pos); | |
278 | pos += 4; | |
279 | if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN) | |
280 | flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN; | |
281 | if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN) | |
282 | flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN; | |
283 | if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) | |
284 | flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; | |
285 | if (status->flag & RX_FLAG_AMPDU_IS_LAST) | |
286 | flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; | |
287 | if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) | |
288 | flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; | |
289 | if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) | |
290 | flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; | |
291 | put_unaligned_le16(flags, pos); | |
292 | pos += 2; | |
293 | if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) | |
294 | *pos++ = status->ampdu_delimiter_crc; | |
295 | else | |
296 | *pos++ = 0; | |
297 | *pos++ = 0; | |
298 | } | |
299 | ||
300 | if (status->vendor_radiotap_len) { | |
301 | /* ensure 2 byte alignment for the vendor field as required */ | |
302 | if ((pos - (u8 *)rthdr) & 1) | |
303 | *pos++ = 0; | |
304 | *pos++ = status->vendor_radiotap_oui[0]; | |
305 | *pos++ = status->vendor_radiotap_oui[1]; | |
306 | *pos++ = status->vendor_radiotap_oui[2]; | |
307 | *pos++ = status->vendor_radiotap_subns; | |
308 | put_unaligned_le16(status->vendor_radiotap_len, pos); | |
309 | pos += 2; | |
310 | /* align the actual payload as requested */ | |
311 | while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1)) | |
312 | *pos++ = 0; | |
313 | } | |
314 | } | |
315 | ||
316 | /* | |
317 | * This function copies a received frame to all monitor interfaces and | |
318 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
319 | * radiotap header the driver might have added. | |
320 | */ | |
321 | static struct sk_buff * | |
322 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
323 | struct ieee80211_rate *rate) | |
324 | { | |
325 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); | |
326 | struct ieee80211_sub_if_data *sdata; | |
327 | int needed_headroom; | |
328 | struct sk_buff *skb, *skb2; | |
329 | struct net_device *prev_dev = NULL; | |
330 | int present_fcs_len = 0; | |
331 | ||
332 | /* | |
333 | * First, we may need to make a copy of the skb because | |
334 | * (1) we need to modify it for radiotap (if not present), and | |
335 | * (2) the other RX handlers will modify the skb we got. | |
336 | * | |
337 | * We don't need to, of course, if we aren't going to return | |
338 | * the SKB because it has a bad FCS/PLCP checksum. | |
339 | */ | |
340 | ||
341 | /* room for the radiotap header based on driver features */ | |
342 | needed_headroom = ieee80211_rx_radiotap_space(local, status); | |
343 | ||
344 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
345 | present_fcs_len = FCS_LEN; | |
346 | ||
347 | /* ensure hdr->frame_control and vendor radiotap data are in skb head */ | |
348 | if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) { | |
349 | dev_kfree_skb(origskb); | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | if (!local->monitors) { | |
354 | if (should_drop_frame(origskb, present_fcs_len)) { | |
355 | dev_kfree_skb(origskb); | |
356 | return NULL; | |
357 | } | |
358 | ||
359 | return remove_monitor_info(local, origskb); | |
360 | } | |
361 | ||
362 | if (should_drop_frame(origskb, present_fcs_len)) { | |
363 | /* only need to expand headroom if necessary */ | |
364 | skb = origskb; | |
365 | origskb = NULL; | |
366 | ||
367 | /* | |
368 | * This shouldn't trigger often because most devices have an | |
369 | * RX header they pull before we get here, and that should | |
370 | * be big enough for our radiotap information. We should | |
371 | * probably export the length to drivers so that we can have | |
372 | * them allocate enough headroom to start with. | |
373 | */ | |
374 | if (skb_headroom(skb) < needed_headroom && | |
375 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { | |
376 | dev_kfree_skb(skb); | |
377 | return NULL; | |
378 | } | |
379 | } else { | |
380 | /* | |
381 | * Need to make a copy and possibly remove radiotap header | |
382 | * and FCS from the original. | |
383 | */ | |
384 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
385 | ||
386 | origskb = remove_monitor_info(local, origskb); | |
387 | ||
388 | if (!skb) | |
389 | return origskb; | |
390 | } | |
391 | ||
392 | /* prepend radiotap information */ | |
393 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, | |
394 | true); | |
395 | ||
396 | skb_reset_mac_header(skb); | |
397 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
398 | skb->pkt_type = PACKET_OTHERHOST; | |
399 | skb->protocol = htons(ETH_P_802_2); | |
400 | ||
401 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
402 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) | |
403 | continue; | |
404 | ||
405 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) | |
406 | continue; | |
407 | ||
408 | if (!ieee80211_sdata_running(sdata)) | |
409 | continue; | |
410 | ||
411 | if (prev_dev) { | |
412 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
413 | if (skb2) { | |
414 | skb2->dev = prev_dev; | |
415 | netif_receive_skb(skb2); | |
416 | } | |
417 | } | |
418 | ||
419 | prev_dev = sdata->dev; | |
420 | sdata->dev->stats.rx_packets++; | |
421 | sdata->dev->stats.rx_bytes += skb->len; | |
422 | } | |
423 | ||
424 | if (prev_dev) { | |
425 | skb->dev = prev_dev; | |
426 | netif_receive_skb(skb); | |
427 | } else | |
428 | dev_kfree_skb(skb); | |
429 | ||
430 | return origskb; | |
431 | } | |
432 | ||
433 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) | |
434 | { | |
435 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
436 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
437 | int tid, seqno_idx, security_idx; | |
438 | ||
439 | /* does the frame have a qos control field? */ | |
440 | if (ieee80211_is_data_qos(hdr->frame_control)) { | |
441 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
442 | /* frame has qos control */ | |
443 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
444 | if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) | |
445 | status->rx_flags |= IEEE80211_RX_AMSDU; | |
446 | ||
447 | seqno_idx = tid; | |
448 | security_idx = tid; | |
449 | } else { | |
450 | /* | |
451 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
452 | * | |
453 | * Sequence numbers for management frames, QoS data | |
454 | * frames with a broadcast/multicast address in the | |
455 | * Address 1 field, and all non-QoS data frames sent | |
456 | * by QoS STAs are assigned using an additional single | |
457 | * modulo-4096 counter, [...] | |
458 | * | |
459 | * We also use that counter for non-QoS STAs. | |
460 | */ | |
461 | seqno_idx = IEEE80211_NUM_TIDS; | |
462 | security_idx = 0; | |
463 | if (ieee80211_is_mgmt(hdr->frame_control)) | |
464 | security_idx = IEEE80211_NUM_TIDS; | |
465 | tid = 0; | |
466 | } | |
467 | ||
468 | rx->seqno_idx = seqno_idx; | |
469 | rx->security_idx = security_idx; | |
470 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. | |
471 | * For now, set skb->priority to 0 for other cases. */ | |
472 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
473 | } | |
474 | ||
475 | /** | |
476 | * DOC: Packet alignment | |
477 | * | |
478 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
479 | * to the stack. | |
480 | * | |
481 | * Additionally, should, if possible, align the payload data in a way that | |
482 | * guarantees that the contained IP header is aligned to a four-byte | |
483 | * boundary. In the case of regular frames, this simply means aligning the | |
484 | * payload to a four-byte boundary (because either the IP header is directly | |
485 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
486 | * in front of it). If the payload data is not properly aligned and the | |
487 | * architecture doesn't support efficient unaligned operations, mac80211 | |
488 | * will align the data. | |
489 | * | |
490 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
491 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
492 | * push the IP header further back to a multiple of four again. Thankfully, the | |
493 | * specs were sane enough this time around to require padding each A-MSDU | |
494 | * subframe to a length that is a multiple of four. | |
495 | * | |
496 | * Padding like Atheros hardware adds which is between the 802.11 header and | |
497 | * the payload is not supported, the driver is required to move the 802.11 | |
498 | * header to be directly in front of the payload in that case. | |
499 | */ | |
500 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
501 | { | |
502 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
503 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
504 | "unaligned packet at 0x%p\n", rx->skb->data); | |
505 | #endif | |
506 | } | |
507 | ||
508 | ||
509 | /* rx handlers */ | |
510 | ||
511 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
512 | { | |
513 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
514 | ||
515 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
516 | return 0; | |
517 | ||
518 | return ieee80211_is_robust_mgmt_frame(hdr); | |
519 | } | |
520 | ||
521 | ||
522 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
523 | { | |
524 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
525 | ||
526 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
527 | return 0; | |
528 | ||
529 | return ieee80211_is_robust_mgmt_frame(hdr); | |
530 | } | |
531 | ||
532 | ||
533 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
534 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
535 | { | |
536 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
537 | struct ieee80211_mmie *mmie; | |
538 | ||
539 | if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) | |
540 | return -1; | |
541 | ||
542 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
543 | return -1; /* not a robust management frame */ | |
544 | ||
545 | mmie = (struct ieee80211_mmie *) | |
546 | (skb->data + skb->len - sizeof(*mmie)); | |
547 | if (mmie->element_id != WLAN_EID_MMIE || | |
548 | mmie->length != sizeof(*mmie) - 2) | |
549 | return -1; | |
550 | ||
551 | return le16_to_cpu(mmie->key_id); | |
552 | } | |
553 | ||
554 | static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) | |
555 | { | |
556 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
557 | char *dev_addr = rx->sdata->vif.addr; | |
558 | ||
559 | if (ieee80211_is_data(hdr->frame_control)) { | |
560 | if (is_multicast_ether_addr(hdr->addr1)) { | |
561 | if (ieee80211_has_tods(hdr->frame_control) || | |
562 | !ieee80211_has_fromds(hdr->frame_control)) | |
563 | return RX_DROP_MONITOR; | |
564 | if (ether_addr_equal(hdr->addr3, dev_addr)) | |
565 | return RX_DROP_MONITOR; | |
566 | } else { | |
567 | if (!ieee80211_has_a4(hdr->frame_control)) | |
568 | return RX_DROP_MONITOR; | |
569 | if (ether_addr_equal(hdr->addr4, dev_addr)) | |
570 | return RX_DROP_MONITOR; | |
571 | } | |
572 | } | |
573 | ||
574 | /* If there is not an established peer link and this is not a peer link | |
575 | * establisment frame, beacon or probe, drop the frame. | |
576 | */ | |
577 | ||
578 | if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { | |
579 | struct ieee80211_mgmt *mgmt; | |
580 | ||
581 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
582 | return RX_DROP_MONITOR; | |
583 | ||
584 | if (ieee80211_is_action(hdr->frame_control)) { | |
585 | u8 category; | |
586 | ||
587 | /* make sure category field is present */ | |
588 | if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) | |
589 | return RX_DROP_MONITOR; | |
590 | ||
591 | mgmt = (struct ieee80211_mgmt *)hdr; | |
592 | category = mgmt->u.action.category; | |
593 | if (category != WLAN_CATEGORY_MESH_ACTION && | |
594 | category != WLAN_CATEGORY_SELF_PROTECTED) | |
595 | return RX_DROP_MONITOR; | |
596 | return RX_CONTINUE; | |
597 | } | |
598 | ||
599 | if (ieee80211_is_probe_req(hdr->frame_control) || | |
600 | ieee80211_is_probe_resp(hdr->frame_control) || | |
601 | ieee80211_is_beacon(hdr->frame_control) || | |
602 | ieee80211_is_auth(hdr->frame_control)) | |
603 | return RX_CONTINUE; | |
604 | ||
605 | return RX_DROP_MONITOR; | |
606 | } | |
607 | ||
608 | return RX_CONTINUE; | |
609 | } | |
610 | ||
611 | #define SEQ_MODULO 0x1000 | |
612 | #define SEQ_MASK 0xfff | |
613 | ||
614 | static inline int seq_less(u16 sq1, u16 sq2) | |
615 | { | |
616 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
617 | } | |
618 | ||
619 | static inline u16 seq_inc(u16 sq) | |
620 | { | |
621 | return (sq + 1) & SEQ_MASK; | |
622 | } | |
623 | ||
624 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
625 | { | |
626 | return (sq1 - sq2) & SEQ_MASK; | |
627 | } | |
628 | ||
629 | static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, | |
630 | struct tid_ampdu_rx *tid_agg_rx, | |
631 | int index) | |
632 | { | |
633 | struct ieee80211_local *local = sdata->local; | |
634 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; | |
635 | struct ieee80211_rx_status *status; | |
636 | ||
637 | lockdep_assert_held(&tid_agg_rx->reorder_lock); | |
638 | ||
639 | if (!skb) | |
640 | goto no_frame; | |
641 | ||
642 | /* release the frame from the reorder ring buffer */ | |
643 | tid_agg_rx->stored_mpdu_num--; | |
644 | tid_agg_rx->reorder_buf[index] = NULL; | |
645 | status = IEEE80211_SKB_RXCB(skb); | |
646 | status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; | |
647 | skb_queue_tail(&local->rx_skb_queue, skb); | |
648 | ||
649 | no_frame: | |
650 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
651 | } | |
652 | ||
653 | static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, | |
654 | struct tid_ampdu_rx *tid_agg_rx, | |
655 | u16 head_seq_num) | |
656 | { | |
657 | int index; | |
658 | ||
659 | lockdep_assert_held(&tid_agg_rx->reorder_lock); | |
660 | ||
661 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
662 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
663 | tid_agg_rx->buf_size; | |
664 | ieee80211_release_reorder_frame(sdata, tid_agg_rx, index); | |
665 | } | |
666 | } | |
667 | ||
668 | /* | |
669 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
670 | * the skb was added to the buffer longer than this time ago, the earlier | |
671 | * frames that have not yet been received are assumed to be lost and the skb | |
672 | * can be released for processing. This may also release other skb's from the | |
673 | * reorder buffer if there are no additional gaps between the frames. | |
674 | * | |
675 | * Callers must hold tid_agg_rx->reorder_lock. | |
676 | */ | |
677 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
678 | ||
679 | static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, | |
680 | struct tid_ampdu_rx *tid_agg_rx) | |
681 | { | |
682 | int index, j; | |
683 | ||
684 | lockdep_assert_held(&tid_agg_rx->reorder_lock); | |
685 | ||
686 | /* release the buffer until next missing frame */ | |
687 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
688 | tid_agg_rx->buf_size; | |
689 | if (!tid_agg_rx->reorder_buf[index] && | |
690 | tid_agg_rx->stored_mpdu_num) { | |
691 | /* | |
692 | * No buffers ready to be released, but check whether any | |
693 | * frames in the reorder buffer have timed out. | |
694 | */ | |
695 | int skipped = 1; | |
696 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
697 | j = (j + 1) % tid_agg_rx->buf_size) { | |
698 | if (!tid_agg_rx->reorder_buf[j]) { | |
699 | skipped++; | |
700 | continue; | |
701 | } | |
702 | if (skipped && | |
703 | !time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
704 | HT_RX_REORDER_BUF_TIMEOUT)) | |
705 | goto set_release_timer; | |
706 | ||
707 | ht_dbg_ratelimited(sdata, | |
708 | "release an RX reorder frame due to timeout on earlier frames\n"); | |
709 | ieee80211_release_reorder_frame(sdata, tid_agg_rx, j); | |
710 | ||
711 | /* | |
712 | * Increment the head seq# also for the skipped slots. | |
713 | */ | |
714 | tid_agg_rx->head_seq_num = | |
715 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
716 | skipped = 0; | |
717 | } | |
718 | } else while (tid_agg_rx->reorder_buf[index]) { | |
719 | ieee80211_release_reorder_frame(sdata, tid_agg_rx, index); | |
720 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
721 | tid_agg_rx->buf_size; | |
722 | } | |
723 | ||
724 | if (tid_agg_rx->stored_mpdu_num) { | |
725 | j = index = seq_sub(tid_agg_rx->head_seq_num, | |
726 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
727 | ||
728 | for (; j != (index - 1) % tid_agg_rx->buf_size; | |
729 | j = (j + 1) % tid_agg_rx->buf_size) { | |
730 | if (tid_agg_rx->reorder_buf[j]) | |
731 | break; | |
732 | } | |
733 | ||
734 | set_release_timer: | |
735 | ||
736 | mod_timer(&tid_agg_rx->reorder_timer, | |
737 | tid_agg_rx->reorder_time[j] + 1 + | |
738 | HT_RX_REORDER_BUF_TIMEOUT); | |
739 | } else { | |
740 | del_timer(&tid_agg_rx->reorder_timer); | |
741 | } | |
742 | } | |
743 | ||
744 | /* | |
745 | * As this function belongs to the RX path it must be under | |
746 | * rcu_read_lock protection. It returns false if the frame | |
747 | * can be processed immediately, true if it was consumed. | |
748 | */ | |
749 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, | |
750 | struct tid_ampdu_rx *tid_agg_rx, | |
751 | struct sk_buff *skb) | |
752 | { | |
753 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
754 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
755 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
756 | u16 head_seq_num, buf_size; | |
757 | int index; | |
758 | bool ret = true; | |
759 | ||
760 | spin_lock(&tid_agg_rx->reorder_lock); | |
761 | ||
762 | buf_size = tid_agg_rx->buf_size; | |
763 | head_seq_num = tid_agg_rx->head_seq_num; | |
764 | ||
765 | /* frame with out of date sequence number */ | |
766 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
767 | dev_kfree_skb(skb); | |
768 | goto out; | |
769 | } | |
770 | ||
771 | /* | |
772 | * If frame the sequence number exceeds our buffering window | |
773 | * size release some previous frames to make room for this one. | |
774 | */ | |
775 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
776 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
777 | /* release stored frames up to new head to stack */ | |
778 | ieee80211_release_reorder_frames(sdata, tid_agg_rx, | |
779 | head_seq_num); | |
780 | } | |
781 | ||
782 | /* Now the new frame is always in the range of the reordering buffer */ | |
783 | ||
784 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
785 | ||
786 | /* check if we already stored this frame */ | |
787 | if (tid_agg_rx->reorder_buf[index]) { | |
788 | dev_kfree_skb(skb); | |
789 | goto out; | |
790 | } | |
791 | ||
792 | /* | |
793 | * If the current MPDU is in the right order and nothing else | |
794 | * is stored we can process it directly, no need to buffer it. | |
795 | * If it is first but there's something stored, we may be able | |
796 | * to release frames after this one. | |
797 | */ | |
798 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
799 | tid_agg_rx->stored_mpdu_num == 0) { | |
800 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
801 | ret = false; | |
802 | goto out; | |
803 | } | |
804 | ||
805 | /* put the frame in the reordering buffer */ | |
806 | tid_agg_rx->reorder_buf[index] = skb; | |
807 | tid_agg_rx->reorder_time[index] = jiffies; | |
808 | tid_agg_rx->stored_mpdu_num++; | |
809 | ieee80211_sta_reorder_release(sdata, tid_agg_rx); | |
810 | ||
811 | out: | |
812 | spin_unlock(&tid_agg_rx->reorder_lock); | |
813 | return ret; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
818 | * true if the MPDU was buffered, false if it should be processed. | |
819 | */ | |
820 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) | |
821 | { | |
822 | struct sk_buff *skb = rx->skb; | |
823 | struct ieee80211_local *local = rx->local; | |
824 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
825 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
826 | struct sta_info *sta = rx->sta; | |
827 | struct tid_ampdu_rx *tid_agg_rx; | |
828 | u16 sc; | |
829 | u8 tid, ack_policy; | |
830 | ||
831 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
832 | goto dont_reorder; | |
833 | ||
834 | /* | |
835 | * filter the QoS data rx stream according to | |
836 | * STA/TID and check if this STA/TID is on aggregation | |
837 | */ | |
838 | ||
839 | if (!sta) | |
840 | goto dont_reorder; | |
841 | ||
842 | ack_policy = *ieee80211_get_qos_ctl(hdr) & | |
843 | IEEE80211_QOS_CTL_ACK_POLICY_MASK; | |
844 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
845 | ||
846 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
847 | if (!tid_agg_rx) | |
848 | goto dont_reorder; | |
849 | ||
850 | /* qos null data frames are excluded */ | |
851 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
852 | goto dont_reorder; | |
853 | ||
854 | /* not part of a BA session */ | |
855 | if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && | |
856 | ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) | |
857 | goto dont_reorder; | |
858 | ||
859 | /* not actually part of this BA session */ | |
860 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
861 | goto dont_reorder; | |
862 | ||
863 | /* new, potentially un-ordered, ampdu frame - process it */ | |
864 | ||
865 | /* reset session timer */ | |
866 | if (tid_agg_rx->timeout) | |
867 | tid_agg_rx->last_rx = jiffies; | |
868 | ||
869 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
870 | sc = le16_to_cpu(hdr->seq_ctrl); | |
871 | if (sc & IEEE80211_SCTL_FRAG) { | |
872 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
873 | skb_queue_tail(&rx->sdata->skb_queue, skb); | |
874 | ieee80211_queue_work(&local->hw, &rx->sdata->work); | |
875 | return; | |
876 | } | |
877 | ||
878 | /* | |
879 | * No locking needed -- we will only ever process one | |
880 | * RX packet at a time, and thus own tid_agg_rx. All | |
881 | * other code manipulating it needs to (and does) make | |
882 | * sure that we cannot get to it any more before doing | |
883 | * anything with it. | |
884 | */ | |
885 | if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb)) | |
886 | return; | |
887 | ||
888 | dont_reorder: | |
889 | skb_queue_tail(&local->rx_skb_queue, skb); | |
890 | } | |
891 | ||
892 | static ieee80211_rx_result debug_noinline | |
893 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) | |
894 | { | |
895 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
896 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
897 | ||
898 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
899 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
900 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && | |
901 | rx->sta->last_seq_ctrl[rx->seqno_idx] == | |
902 | hdr->seq_ctrl)) { | |
903 | if (status->rx_flags & IEEE80211_RX_RA_MATCH) { | |
904 | rx->local->dot11FrameDuplicateCount++; | |
905 | rx->sta->num_duplicates++; | |
906 | } | |
907 | return RX_DROP_UNUSABLE; | |
908 | } else | |
909 | rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; | |
910 | } | |
911 | ||
912 | if (unlikely(rx->skb->len < 16)) { | |
913 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
914 | return RX_DROP_MONITOR; | |
915 | } | |
916 | ||
917 | /* Drop disallowed frame classes based on STA auth/assoc state; | |
918 | * IEEE 802.11, Chap 5.5. | |
919 | * | |
920 | * mac80211 filters only based on association state, i.e. it drops | |
921 | * Class 3 frames from not associated stations. hostapd sends | |
922 | * deauth/disassoc frames when needed. In addition, hostapd is | |
923 | * responsible for filtering on both auth and assoc states. | |
924 | */ | |
925 | ||
926 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) | |
927 | return ieee80211_rx_mesh_check(rx); | |
928 | ||
929 | if (unlikely((ieee80211_is_data(hdr->frame_control) || | |
930 | ieee80211_is_pspoll(hdr->frame_control)) && | |
931 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
932 | rx->sdata->vif.type != NL80211_IFTYPE_WDS && | |
933 | (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { | |
934 | /* | |
935 | * accept port control frames from the AP even when it's not | |
936 | * yet marked ASSOC to prevent a race where we don't set the | |
937 | * assoc bit quickly enough before it sends the first frame | |
938 | */ | |
939 | if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
940 | ieee80211_is_data_present(hdr->frame_control)) { | |
941 | unsigned int hdrlen; | |
942 | __be16 ethertype; | |
943 | ||
944 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
945 | ||
946 | if (rx->skb->len < hdrlen + 8) | |
947 | return RX_DROP_MONITOR; | |
948 | ||
949 | skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); | |
950 | if (ethertype == rx->sdata->control_port_protocol) | |
951 | return RX_CONTINUE; | |
952 | } | |
953 | ||
954 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && | |
955 | cfg80211_rx_spurious_frame(rx->sdata->dev, | |
956 | hdr->addr2, | |
957 | GFP_ATOMIC)) | |
958 | return RX_DROP_UNUSABLE; | |
959 | ||
960 | return RX_DROP_MONITOR; | |
961 | } | |
962 | ||
963 | return RX_CONTINUE; | |
964 | } | |
965 | ||
966 | ||
967 | static ieee80211_rx_result debug_noinline | |
968 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) | |
969 | { | |
970 | struct sk_buff *skb = rx->skb; | |
971 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
972 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
973 | int keyidx; | |
974 | int hdrlen; | |
975 | ieee80211_rx_result result = RX_DROP_UNUSABLE; | |
976 | struct ieee80211_key *sta_ptk = NULL; | |
977 | int mmie_keyidx = -1; | |
978 | __le16 fc; | |
979 | ||
980 | /* | |
981 | * Key selection 101 | |
982 | * | |
983 | * There are four types of keys: | |
984 | * - GTK (group keys) | |
985 | * - IGTK (group keys for management frames) | |
986 | * - PTK (pairwise keys) | |
987 | * - STK (station-to-station pairwise keys) | |
988 | * | |
989 | * When selecting a key, we have to distinguish between multicast | |
990 | * (including broadcast) and unicast frames, the latter can only | |
991 | * use PTKs and STKs while the former always use GTKs and IGTKs. | |
992 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
993 | * unicast frames can also use key indices like GTKs. Hence, if we | |
994 | * don't have a PTK/STK we check the key index for a WEP key. | |
995 | * | |
996 | * Note that in a regular BSS, multicast frames are sent by the | |
997 | * AP only, associated stations unicast the frame to the AP first | |
998 | * which then multicasts it on their behalf. | |
999 | * | |
1000 | * There is also a slight problem in IBSS mode: GTKs are negotiated | |
1001 | * with each station, that is something we don't currently handle. | |
1002 | * The spec seems to expect that one negotiates the same key with | |
1003 | * every station but there's no such requirement; VLANs could be | |
1004 | * possible. | |
1005 | */ | |
1006 | ||
1007 | /* | |
1008 | * No point in finding a key and decrypting if the frame is neither | |
1009 | * addressed to us nor a multicast frame. | |
1010 | */ | |
1011 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
1012 | return RX_CONTINUE; | |
1013 | ||
1014 | /* start without a key */ | |
1015 | rx->key = NULL; | |
1016 | ||
1017 | if (rx->sta) | |
1018 | sta_ptk = rcu_dereference(rx->sta->ptk); | |
1019 | ||
1020 | fc = hdr->frame_control; | |
1021 | ||
1022 | if (!ieee80211_has_protected(fc)) | |
1023 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
1024 | ||
1025 | if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { | |
1026 | rx->key = sta_ptk; | |
1027 | if ((status->flag & RX_FLAG_DECRYPTED) && | |
1028 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
1029 | return RX_CONTINUE; | |
1030 | /* Skip decryption if the frame is not protected. */ | |
1031 | if (!ieee80211_has_protected(fc)) | |
1032 | return RX_CONTINUE; | |
1033 | } else if (mmie_keyidx >= 0) { | |
1034 | /* Broadcast/multicast robust management frame / BIP */ | |
1035 | if ((status->flag & RX_FLAG_DECRYPTED) && | |
1036 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
1037 | return RX_CONTINUE; | |
1038 | ||
1039 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
1040 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
1041 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
1042 | if (rx->sta) | |
1043 | rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); | |
1044 | if (!rx->key) | |
1045 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
1046 | } else if (!ieee80211_has_protected(fc)) { | |
1047 | /* | |
1048 | * The frame was not protected, so skip decryption. However, we | |
1049 | * need to set rx->key if there is a key that could have been | |
1050 | * used so that the frame may be dropped if encryption would | |
1051 | * have been expected. | |
1052 | */ | |
1053 | struct ieee80211_key *key = NULL; | |
1054 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
1055 | int i; | |
1056 | ||
1057 | if (ieee80211_is_mgmt(fc) && | |
1058 | is_multicast_ether_addr(hdr->addr1) && | |
1059 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
1060 | rx->key = key; | |
1061 | else { | |
1062 | if (rx->sta) { | |
1063 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
1064 | key = rcu_dereference(rx->sta->gtk[i]); | |
1065 | if (key) | |
1066 | break; | |
1067 | } | |
1068 | } | |
1069 | if (!key) { | |
1070 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
1071 | key = rcu_dereference(sdata->keys[i]); | |
1072 | if (key) | |
1073 | break; | |
1074 | } | |
1075 | } | |
1076 | if (key) | |
1077 | rx->key = key; | |
1078 | } | |
1079 | return RX_CONTINUE; | |
1080 | } else { | |
1081 | u8 keyid; | |
1082 | /* | |
1083 | * The device doesn't give us the IV so we won't be | |
1084 | * able to look up the key. That's ok though, we | |
1085 | * don't need to decrypt the frame, we just won't | |
1086 | * be able to keep statistics accurate. | |
1087 | * Except for key threshold notifications, should | |
1088 | * we somehow allow the driver to tell us which key | |
1089 | * the hardware used if this flag is set? | |
1090 | */ | |
1091 | if ((status->flag & RX_FLAG_DECRYPTED) && | |
1092 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
1093 | return RX_CONTINUE; | |
1094 | ||
1095 | hdrlen = ieee80211_hdrlen(fc); | |
1096 | ||
1097 | if (rx->skb->len < 8 + hdrlen) | |
1098 | return RX_DROP_UNUSABLE; /* TODO: count this? */ | |
1099 | ||
1100 | /* | |
1101 | * no need to call ieee80211_wep_get_keyidx, | |
1102 | * it verifies a bunch of things we've done already | |
1103 | */ | |
1104 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); | |
1105 | keyidx = keyid >> 6; | |
1106 | ||
1107 | /* check per-station GTK first, if multicast packet */ | |
1108 | if (is_multicast_ether_addr(hdr->addr1) && rx->sta) | |
1109 | rx->key = rcu_dereference(rx->sta->gtk[keyidx]); | |
1110 | ||
1111 | /* if not found, try default key */ | |
1112 | if (!rx->key) { | |
1113 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); | |
1114 | ||
1115 | /* | |
1116 | * RSNA-protected unicast frames should always be | |
1117 | * sent with pairwise or station-to-station keys, | |
1118 | * but for WEP we allow using a key index as well. | |
1119 | */ | |
1120 | if (rx->key && | |
1121 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && | |
1122 | rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && | |
1123 | !is_multicast_ether_addr(hdr->addr1)) | |
1124 | rx->key = NULL; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | if (rx->key) { | |
1129 | if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) | |
1130 | return RX_DROP_MONITOR; | |
1131 | ||
1132 | rx->key->tx_rx_count++; | |
1133 | /* TODO: add threshold stuff again */ | |
1134 | } else { | |
1135 | return RX_DROP_MONITOR; | |
1136 | } | |
1137 | ||
1138 | switch (rx->key->conf.cipher) { | |
1139 | case WLAN_CIPHER_SUITE_WEP40: | |
1140 | case WLAN_CIPHER_SUITE_WEP104: | |
1141 | result = ieee80211_crypto_wep_decrypt(rx); | |
1142 | break; | |
1143 | case WLAN_CIPHER_SUITE_TKIP: | |
1144 | result = ieee80211_crypto_tkip_decrypt(rx); | |
1145 | break; | |
1146 | case WLAN_CIPHER_SUITE_CCMP: | |
1147 | result = ieee80211_crypto_ccmp_decrypt(rx); | |
1148 | break; | |
1149 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
1150 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
1151 | break; | |
1152 | default: | |
1153 | /* | |
1154 | * We can reach here only with HW-only algorithms | |
1155 | * but why didn't it decrypt the frame?! | |
1156 | */ | |
1157 | return RX_DROP_UNUSABLE; | |
1158 | } | |
1159 | ||
1160 | /* the hdr variable is invalid after the decrypt handlers */ | |
1161 | ||
1162 | /* either the frame has been decrypted or will be dropped */ | |
1163 | status->flag |= RX_FLAG_DECRYPTED; | |
1164 | ||
1165 | return result; | |
1166 | } | |
1167 | ||
1168 | static ieee80211_rx_result debug_noinline | |
1169 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
1170 | { | |
1171 | struct ieee80211_local *local; | |
1172 | struct ieee80211_hdr *hdr; | |
1173 | struct sk_buff *skb; | |
1174 | ||
1175 | local = rx->local; | |
1176 | skb = rx->skb; | |
1177 | hdr = (struct ieee80211_hdr *) skb->data; | |
1178 | ||
1179 | if (!local->pspolling) | |
1180 | return RX_CONTINUE; | |
1181 | ||
1182 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
1183 | /* this is not from AP */ | |
1184 | return RX_CONTINUE; | |
1185 | ||
1186 | if (!ieee80211_is_data(hdr->frame_control)) | |
1187 | return RX_CONTINUE; | |
1188 | ||
1189 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
1190 | /* AP has no more frames buffered for us */ | |
1191 | local->pspolling = false; | |
1192 | return RX_CONTINUE; | |
1193 | } | |
1194 | ||
1195 | /* more data bit is set, let's request a new frame from the AP */ | |
1196 | ieee80211_send_pspoll(local, rx->sdata); | |
1197 | ||
1198 | return RX_CONTINUE; | |
1199 | } | |
1200 | ||
1201 | static void sta_ps_start(struct sta_info *sta) | |
1202 | { | |
1203 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1204 | struct ieee80211_local *local = sdata->local; | |
1205 | struct ps_data *ps; | |
1206 | ||
1207 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP || | |
1208 | sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
1209 | ps = &sdata->bss->ps; | |
1210 | else | |
1211 | return; | |
1212 | ||
1213 | atomic_inc(&ps->num_sta_ps); | |
1214 | set_sta_flag(sta, WLAN_STA_PS_STA); | |
1215 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) | |
1216 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); | |
1217 | ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", | |
1218 | sta->sta.addr, sta->sta.aid); | |
1219 | } | |
1220 | ||
1221 | static void sta_ps_end(struct sta_info *sta) | |
1222 | { | |
1223 | ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", | |
1224 | sta->sta.addr, sta->sta.aid); | |
1225 | ||
1226 | if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { | |
1227 | ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", | |
1228 | sta->sta.addr, sta->sta.aid); | |
1229 | return; | |
1230 | } | |
1231 | ||
1232 | ieee80211_sta_ps_deliver_wakeup(sta); | |
1233 | } | |
1234 | ||
1235 | int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) | |
1236 | { | |
1237 | struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); | |
1238 | bool in_ps; | |
1239 | ||
1240 | WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); | |
1241 | ||
1242 | /* Don't let the same PS state be set twice */ | |
1243 | in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA); | |
1244 | if ((start && in_ps) || (!start && !in_ps)) | |
1245 | return -EINVAL; | |
1246 | ||
1247 | if (start) | |
1248 | sta_ps_start(sta_inf); | |
1249 | else | |
1250 | sta_ps_end(sta_inf); | |
1251 | ||
1252 | return 0; | |
1253 | } | |
1254 | EXPORT_SYMBOL(ieee80211_sta_ps_transition); | |
1255 | ||
1256 | static ieee80211_rx_result debug_noinline | |
1257 | ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) | |
1258 | { | |
1259 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
1260 | struct ieee80211_hdr *hdr = (void *)rx->skb->data; | |
1261 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
1262 | int tid, ac; | |
1263 | ||
1264 | if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
1265 | return RX_CONTINUE; | |
1266 | ||
1267 | if (sdata->vif.type != NL80211_IFTYPE_AP && | |
1268 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN) | |
1269 | return RX_CONTINUE; | |
1270 | ||
1271 | /* | |
1272 | * The device handles station powersave, so don't do anything about | |
1273 | * uAPSD and PS-Poll frames (the latter shouldn't even come up from | |
1274 | * it to mac80211 since they're handled.) | |
1275 | */ | |
1276 | if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
1277 | return RX_CONTINUE; | |
1278 | ||
1279 | /* | |
1280 | * Don't do anything if the station isn't already asleep. In | |
1281 | * the uAPSD case, the station will probably be marked asleep, | |
1282 | * in the PS-Poll case the station must be confused ... | |
1283 | */ | |
1284 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) | |
1285 | return RX_CONTINUE; | |
1286 | ||
1287 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { | |
1288 | if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { | |
1289 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) | |
1290 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1291 | else | |
1292 | set_sta_flag(rx->sta, WLAN_STA_PSPOLL); | |
1293 | } | |
1294 | ||
1295 | /* Free PS Poll skb here instead of returning RX_DROP that would | |
1296 | * count as an dropped frame. */ | |
1297 | dev_kfree_skb(rx->skb); | |
1298 | ||
1299 | return RX_QUEUED; | |
1300 | } else if (!ieee80211_has_morefrags(hdr->frame_control) && | |
1301 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && | |
1302 | ieee80211_has_pm(hdr->frame_control) && | |
1303 | (ieee80211_is_data_qos(hdr->frame_control) || | |
1304 | ieee80211_is_qos_nullfunc(hdr->frame_control))) { | |
1305 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
1306 | ac = ieee802_1d_to_ac[tid & 7]; | |
1307 | ||
1308 | /* | |
1309 | * If this AC is not trigger-enabled do nothing. | |
1310 | * | |
1311 | * NB: This could/should check a separate bitmap of trigger- | |
1312 | * enabled queues, but for now we only implement uAPSD w/o | |
1313 | * TSPEC changes to the ACs, so they're always the same. | |
1314 | */ | |
1315 | if (!(rx->sta->sta.uapsd_queues & BIT(ac))) | |
1316 | return RX_CONTINUE; | |
1317 | ||
1318 | /* if we are in a service period, do nothing */ | |
1319 | if (test_sta_flag(rx->sta, WLAN_STA_SP)) | |
1320 | return RX_CONTINUE; | |
1321 | ||
1322 | if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) | |
1323 | ieee80211_sta_ps_deliver_uapsd(rx->sta); | |
1324 | else | |
1325 | set_sta_flag(rx->sta, WLAN_STA_UAPSD); | |
1326 | } | |
1327 | ||
1328 | return RX_CONTINUE; | |
1329 | } | |
1330 | ||
1331 | static ieee80211_rx_result debug_noinline | |
1332 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) | |
1333 | { | |
1334 | struct sta_info *sta = rx->sta; | |
1335 | struct sk_buff *skb = rx->skb; | |
1336 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1337 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1338 | ||
1339 | if (!sta) | |
1340 | return RX_CONTINUE; | |
1341 | ||
1342 | /* | |
1343 | * Update last_rx only for IBSS packets which are for the current | |
1344 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1345 | * where other STAs start using different BSSID. | |
1346 | */ | |
1347 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
1348 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, | |
1349 | NL80211_IFTYPE_ADHOC); | |
1350 | if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) { | |
1351 | sta->last_rx = jiffies; | |
1352 | if (ieee80211_is_data(hdr->frame_control)) { | |
1353 | sta->last_rx_rate_idx = status->rate_idx; | |
1354 | sta->last_rx_rate_flag = status->flag; | |
1355 | } | |
1356 | } | |
1357 | } else if (!is_multicast_ether_addr(hdr->addr1)) { | |
1358 | /* | |
1359 | * Mesh beacons will update last_rx when if they are found to | |
1360 | * match the current local configuration when processed. | |
1361 | */ | |
1362 | sta->last_rx = jiffies; | |
1363 | if (ieee80211_is_data(hdr->frame_control)) { | |
1364 | sta->last_rx_rate_idx = status->rate_idx; | |
1365 | sta->last_rx_rate_flag = status->flag; | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
1370 | return RX_CONTINUE; | |
1371 | ||
1372 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) | |
1373 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1374 | ||
1375 | sta->rx_fragments++; | |
1376 | sta->rx_bytes += rx->skb->len; | |
1377 | if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { | |
1378 | sta->last_signal = status->signal; | |
1379 | ewma_add(&sta->avg_signal, -status->signal); | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * Change STA power saving mode only at the end of a frame | |
1384 | * exchange sequence. | |
1385 | */ | |
1386 | if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && | |
1387 | !ieee80211_has_morefrags(hdr->frame_control) && | |
1388 | !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && | |
1389 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1390 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
1391 | if (test_sta_flag(sta, WLAN_STA_PS_STA)) { | |
1392 | /* | |
1393 | * Ignore doze->wake transitions that are | |
1394 | * indicated by non-data frames, the standard | |
1395 | * is unclear here, but for example going to | |
1396 | * PS mode and then scanning would cause a | |
1397 | * doze->wake transition for the probe request, | |
1398 | * and that is clearly undesirable. | |
1399 | */ | |
1400 | if (ieee80211_is_data(hdr->frame_control) && | |
1401 | !ieee80211_has_pm(hdr->frame_control)) | |
1402 | sta_ps_end(sta); | |
1403 | } else { | |
1404 | if (ieee80211_has_pm(hdr->frame_control)) | |
1405 | sta_ps_start(sta); | |
1406 | } | |
1407 | } | |
1408 | ||
1409 | /* | |
1410 | * Drop (qos-)data::nullfunc frames silently, since they | |
1411 | * are used only to control station power saving mode. | |
1412 | */ | |
1413 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1414 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
1415 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
1416 | ||
1417 | /* | |
1418 | * If we receive a 4-addr nullfunc frame from a STA | |
1419 | * that was not moved to a 4-addr STA vlan yet send | |
1420 | * the event to userspace and for older hostapd drop | |
1421 | * the frame to the monitor interface. | |
1422 | */ | |
1423 | if (ieee80211_has_a4(hdr->frame_control) && | |
1424 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1425 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1426 | !rx->sdata->u.vlan.sta))) { | |
1427 | if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) | |
1428 | cfg80211_rx_unexpected_4addr_frame( | |
1429 | rx->sdata->dev, sta->sta.addr, | |
1430 | GFP_ATOMIC); | |
1431 | return RX_DROP_MONITOR; | |
1432 | } | |
1433 | /* | |
1434 | * Update counter and free packet here to avoid | |
1435 | * counting this as a dropped packed. | |
1436 | */ | |
1437 | sta->rx_packets++; | |
1438 | dev_kfree_skb(rx->skb); | |
1439 | return RX_QUEUED; | |
1440 | } | |
1441 | ||
1442 | return RX_CONTINUE; | |
1443 | } /* ieee80211_rx_h_sta_process */ | |
1444 | ||
1445 | static inline struct ieee80211_fragment_entry * | |
1446 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1447 | unsigned int frag, unsigned int seq, int rx_queue, | |
1448 | struct sk_buff **skb) | |
1449 | { | |
1450 | struct ieee80211_fragment_entry *entry; | |
1451 | ||
1452 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1453 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1454 | sdata->fragment_next = 0; | |
1455 | ||
1456 | if (!skb_queue_empty(&entry->skb_list)) | |
1457 | __skb_queue_purge(&entry->skb_list); | |
1458 | ||
1459 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1460 | *skb = NULL; | |
1461 | entry->first_frag_time = jiffies; | |
1462 | entry->seq = seq; | |
1463 | entry->rx_queue = rx_queue; | |
1464 | entry->last_frag = frag; | |
1465 | entry->ccmp = 0; | |
1466 | entry->extra_len = 0; | |
1467 | ||
1468 | return entry; | |
1469 | } | |
1470 | ||
1471 | static inline struct ieee80211_fragment_entry * | |
1472 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
1473 | unsigned int frag, unsigned int seq, | |
1474 | int rx_queue, struct ieee80211_hdr *hdr) | |
1475 | { | |
1476 | struct ieee80211_fragment_entry *entry; | |
1477 | int i, idx; | |
1478 | ||
1479 | idx = sdata->fragment_next; | |
1480 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1481 | struct ieee80211_hdr *f_hdr; | |
1482 | ||
1483 | idx--; | |
1484 | if (idx < 0) | |
1485 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1486 | ||
1487 | entry = &sdata->fragments[idx]; | |
1488 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1489 | entry->rx_queue != rx_queue || | |
1490 | entry->last_frag + 1 != frag) | |
1491 | continue; | |
1492 | ||
1493 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; | |
1494 | ||
1495 | /* | |
1496 | * Check ftype and addresses are equal, else check next fragment | |
1497 | */ | |
1498 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1499 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
1500 | !ether_addr_equal(hdr->addr1, f_hdr->addr1) || | |
1501 | !ether_addr_equal(hdr->addr2, f_hdr->addr2)) | |
1502 | continue; | |
1503 | ||
1504 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { | |
1505 | __skb_queue_purge(&entry->skb_list); | |
1506 | continue; | |
1507 | } | |
1508 | return entry; | |
1509 | } | |
1510 | ||
1511 | return NULL; | |
1512 | } | |
1513 | ||
1514 | static ieee80211_rx_result debug_noinline | |
1515 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) | |
1516 | { | |
1517 | struct ieee80211_hdr *hdr; | |
1518 | u16 sc; | |
1519 | __le16 fc; | |
1520 | unsigned int frag, seq; | |
1521 | struct ieee80211_fragment_entry *entry; | |
1522 | struct sk_buff *skb; | |
1523 | struct ieee80211_rx_status *status; | |
1524 | ||
1525 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
1526 | fc = hdr->frame_control; | |
1527 | ||
1528 | if (ieee80211_is_ctl(fc)) | |
1529 | return RX_CONTINUE; | |
1530 | ||
1531 | sc = le16_to_cpu(hdr->seq_ctrl); | |
1532 | frag = sc & IEEE80211_SCTL_FRAG; | |
1533 | ||
1534 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || | |
1535 | is_multicast_ether_addr(hdr->addr1))) { | |
1536 | /* not fragmented */ | |
1537 | goto out; | |
1538 | } | |
1539 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1540 | ||
1541 | if (skb_linearize(rx->skb)) | |
1542 | return RX_DROP_UNUSABLE; | |
1543 | ||
1544 | /* | |
1545 | * skb_linearize() might change the skb->data and | |
1546 | * previously cached variables (in this case, hdr) need to | |
1547 | * be refreshed with the new data. | |
1548 | */ | |
1549 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
1550 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1551 | ||
1552 | if (frag == 0) { | |
1553 | /* This is the first fragment of a new frame. */ | |
1554 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
1555 | rx->seqno_idx, &(rx->skb)); | |
1556 | if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && | |
1557 | ieee80211_has_protected(fc)) { | |
1558 | int queue = rx->security_idx; | |
1559 | /* Store CCMP PN so that we can verify that the next | |
1560 | * fragment has a sequential PN value. */ | |
1561 | entry->ccmp = 1; | |
1562 | memcpy(entry->last_pn, | |
1563 | rx->key->u.ccmp.rx_pn[queue], | |
1564 | CCMP_PN_LEN); | |
1565 | } | |
1566 | return RX_QUEUED; | |
1567 | } | |
1568 | ||
1569 | /* This is a fragment for a frame that should already be pending in | |
1570 | * fragment cache. Add this fragment to the end of the pending entry. | |
1571 | */ | |
1572 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, | |
1573 | rx->seqno_idx, hdr); | |
1574 | if (!entry) { | |
1575 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1576 | return RX_DROP_MONITOR; | |
1577 | } | |
1578 | ||
1579 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1580 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1581 | if (entry->ccmp) { | |
1582 | int i; | |
1583 | u8 pn[CCMP_PN_LEN], *rpn; | |
1584 | int queue; | |
1585 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) | |
1586 | return RX_DROP_UNUSABLE; | |
1587 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); | |
1588 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1589 | pn[i]++; | |
1590 | if (pn[i]) | |
1591 | break; | |
1592 | } | |
1593 | queue = rx->security_idx; | |
1594 | rpn = rx->key->u.ccmp.rx_pn[queue]; | |
1595 | if (memcmp(pn, rpn, CCMP_PN_LEN)) | |
1596 | return RX_DROP_UNUSABLE; | |
1597 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
1598 | } | |
1599 | ||
1600 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); | |
1601 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
1602 | entry->last_frag = frag; | |
1603 | entry->extra_len += rx->skb->len; | |
1604 | if (ieee80211_has_morefrags(fc)) { | |
1605 | rx->skb = NULL; | |
1606 | return RX_QUEUED; | |
1607 | } | |
1608 | ||
1609 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1610 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1611 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1612 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1613 | GFP_ATOMIC))) { | |
1614 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1615 | __skb_queue_purge(&entry->skb_list); | |
1616 | return RX_DROP_UNUSABLE; | |
1617 | } | |
1618 | } | |
1619 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1620 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1621 | dev_kfree_skb(skb); | |
1622 | } | |
1623 | ||
1624 | /* Complete frame has been reassembled - process it now */ | |
1625 | status = IEEE80211_SKB_RXCB(rx->skb); | |
1626 | status->rx_flags |= IEEE80211_RX_FRAGMENTED; | |
1627 | ||
1628 | out: | |
1629 | if (rx->sta) | |
1630 | rx->sta->rx_packets++; | |
1631 | if (is_multicast_ether_addr(hdr->addr1)) | |
1632 | rx->local->dot11MulticastReceivedFrameCount++; | |
1633 | else | |
1634 | ieee80211_led_rx(rx->local); | |
1635 | return RX_CONTINUE; | |
1636 | } | |
1637 | ||
1638 | static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) | |
1639 | { | |
1640 | if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) | |
1641 | return -EACCES; | |
1642 | ||
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) | |
1647 | { | |
1648 | struct sk_buff *skb = rx->skb; | |
1649 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1650 | ||
1651 | /* | |
1652 | * Pass through unencrypted frames if the hardware has | |
1653 | * decrypted them already. | |
1654 | */ | |
1655 | if (status->flag & RX_FLAG_DECRYPTED) | |
1656 | return 0; | |
1657 | ||
1658 | /* Drop unencrypted frames if key is set. */ | |
1659 | if (unlikely(!ieee80211_has_protected(fc) && | |
1660 | !ieee80211_is_nullfunc(fc) && | |
1661 | ieee80211_is_data(fc) && | |
1662 | (rx->key || rx->sdata->drop_unencrypted))) | |
1663 | return -EACCES; | |
1664 | ||
1665 | return 0; | |
1666 | } | |
1667 | ||
1668 | static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1669 | { | |
1670 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
1671 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
1672 | __le16 fc = hdr->frame_control; | |
1673 | ||
1674 | /* | |
1675 | * Pass through unencrypted frames if the hardware has | |
1676 | * decrypted them already. | |
1677 | */ | |
1678 | if (status->flag & RX_FLAG_DECRYPTED) | |
1679 | return 0; | |
1680 | ||
1681 | if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { | |
1682 | if (unlikely(!ieee80211_has_protected(fc) && | |
1683 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1684 | rx->key)) { | |
1685 | if (ieee80211_is_deauth(fc)) | |
1686 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1687 | rx->skb->data, | |
1688 | rx->skb->len); | |
1689 | else if (ieee80211_is_disassoc(fc)) | |
1690 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1691 | rx->skb->data, | |
1692 | rx->skb->len); | |
1693 | return -EACCES; | |
1694 | } | |
1695 | /* BIP does not use Protected field, so need to check MMIE */ | |
1696 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && | |
1697 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) { | |
1698 | if (ieee80211_is_deauth(fc)) | |
1699 | cfg80211_send_unprot_deauth(rx->sdata->dev, | |
1700 | rx->skb->data, | |
1701 | rx->skb->len); | |
1702 | else if (ieee80211_is_disassoc(fc)) | |
1703 | cfg80211_send_unprot_disassoc(rx->sdata->dev, | |
1704 | rx->skb->data, | |
1705 | rx->skb->len); | |
1706 | return -EACCES; | |
1707 | } | |
1708 | /* | |
1709 | * When using MFP, Action frames are not allowed prior to | |
1710 | * having configured keys. | |
1711 | */ | |
1712 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1713 | ieee80211_is_robust_mgmt_frame( | |
1714 | (struct ieee80211_hdr *) rx->skb->data))) | |
1715 | return -EACCES; | |
1716 | } | |
1717 | ||
1718 | return 0; | |
1719 | } | |
1720 | ||
1721 | static int | |
1722 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) | |
1723 | { | |
1724 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
1725 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
1726 | bool check_port_control = false; | |
1727 | struct ethhdr *ehdr; | |
1728 | int ret; | |
1729 | ||
1730 | *port_control = false; | |
1731 | if (ieee80211_has_a4(hdr->frame_control) && | |
1732 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
1733 | return -1; | |
1734 | ||
1735 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
1736 | !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { | |
1737 | ||
1738 | if (!sdata->u.mgd.use_4addr) | |
1739 | return -1; | |
1740 | else | |
1741 | check_port_control = true; | |
1742 | } | |
1743 | ||
1744 | if (is_multicast_ether_addr(hdr->addr1) && | |
1745 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) | |
1746 | return -1; | |
1747 | ||
1748 | ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); | |
1749 | if (ret < 0) | |
1750 | return ret; | |
1751 | ||
1752 | ehdr = (struct ethhdr *) rx->skb->data; | |
1753 | if (ehdr->h_proto == rx->sdata->control_port_protocol) | |
1754 | *port_control = true; | |
1755 | else if (check_port_control) | |
1756 | return -1; | |
1757 | ||
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | /* | |
1762 | * requires that rx->skb is a frame with ethernet header | |
1763 | */ | |
1764 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) | |
1765 | { | |
1766 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) | |
1767 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; | |
1768 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1769 | ||
1770 | /* | |
1771 | * Allow EAPOL frames to us/the PAE group address regardless | |
1772 | * of whether the frame was encrypted or not. | |
1773 | */ | |
1774 | if (ehdr->h_proto == rx->sdata->control_port_protocol && | |
1775 | (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || | |
1776 | ether_addr_equal(ehdr->h_dest, pae_group_addr))) | |
1777 | return true; | |
1778 | ||
1779 | if (ieee80211_802_1x_port_control(rx) || | |
1780 | ieee80211_drop_unencrypted(rx, fc)) | |
1781 | return false; | |
1782 | ||
1783 | return true; | |
1784 | } | |
1785 | ||
1786 | /* | |
1787 | * requires that rx->skb is a frame with ethernet header | |
1788 | */ | |
1789 | static void | |
1790 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) | |
1791 | { | |
1792 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
1793 | struct net_device *dev = sdata->dev; | |
1794 | struct sk_buff *skb, *xmit_skb; | |
1795 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1796 | struct sta_info *dsta; | |
1797 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
1798 | ||
1799 | skb = rx->skb; | |
1800 | xmit_skb = NULL; | |
1801 | ||
1802 | if ((sdata->vif.type == NL80211_IFTYPE_AP || | |
1803 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
1804 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && | |
1805 | (status->rx_flags & IEEE80211_RX_RA_MATCH) && | |
1806 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
1807 | if (is_multicast_ether_addr(ehdr->h_dest)) { | |
1808 | /* | |
1809 | * send multicast frames both to higher layers in | |
1810 | * local net stack and back to the wireless medium | |
1811 | */ | |
1812 | xmit_skb = skb_copy(skb, GFP_ATOMIC); | |
1813 | if (!xmit_skb) | |
1814 | net_info_ratelimited("%s: failed to clone multicast frame\n", | |
1815 | dev->name); | |
1816 | } else { | |
1817 | dsta = sta_info_get(sdata, skb->data); | |
1818 | if (dsta) { | |
1819 | /* | |
1820 | * The destination station is associated to | |
1821 | * this AP (in this VLAN), so send the frame | |
1822 | * directly to it and do not pass it to local | |
1823 | * net stack. | |
1824 | */ | |
1825 | xmit_skb = skb; | |
1826 | skb = NULL; | |
1827 | } | |
1828 | } | |
1829 | } | |
1830 | ||
1831 | if (skb) { | |
1832 | int align __maybe_unused; | |
1833 | ||
1834 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
1835 | /* | |
1836 | * 'align' will only take the values 0 or 2 here | |
1837 | * since all frames are required to be aligned | |
1838 | * to 2-byte boundaries when being passed to | |
1839 | * mac80211. That also explains the __skb_push() | |
1840 | * below. | |
1841 | */ | |
1842 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; | |
1843 | if (align) { | |
1844 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1845 | dev_kfree_skb(skb); | |
1846 | skb = NULL; | |
1847 | } else { | |
1848 | u8 *data = skb->data; | |
1849 | size_t len = skb_headlen(skb); | |
1850 | skb->data -= align; | |
1851 | memmove(skb->data, data, len); | |
1852 | skb_set_tail_pointer(skb, len); | |
1853 | } | |
1854 | } | |
1855 | #endif | |
1856 | ||
1857 | if (skb) { | |
1858 | /* deliver to local stack */ | |
1859 | skb->protocol = eth_type_trans(skb, dev); | |
1860 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1861 | netif_receive_skb(skb); | |
1862 | } | |
1863 | } | |
1864 | ||
1865 | if (xmit_skb) { | |
1866 | /* | |
1867 | * Send to wireless media and increase priority by 256 to | |
1868 | * keep the received priority instead of reclassifying | |
1869 | * the frame (see cfg80211_classify8021d). | |
1870 | */ | |
1871 | xmit_skb->priority += 256; | |
1872 | xmit_skb->protocol = htons(ETH_P_802_3); | |
1873 | skb_reset_network_header(xmit_skb); | |
1874 | skb_reset_mac_header(xmit_skb); | |
1875 | dev_queue_xmit(xmit_skb); | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | static ieee80211_rx_result debug_noinline | |
1880 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) | |
1881 | { | |
1882 | struct net_device *dev = rx->sdata->dev; | |
1883 | struct sk_buff *skb = rx->skb; | |
1884 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1885 | __le16 fc = hdr->frame_control; | |
1886 | struct sk_buff_head frame_list; | |
1887 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
1888 | ||
1889 | if (unlikely(!ieee80211_is_data(fc))) | |
1890 | return RX_CONTINUE; | |
1891 | ||
1892 | if (unlikely(!ieee80211_is_data_present(fc))) | |
1893 | return RX_DROP_MONITOR; | |
1894 | ||
1895 | if (!(status->rx_flags & IEEE80211_RX_AMSDU)) | |
1896 | return RX_CONTINUE; | |
1897 | ||
1898 | if (ieee80211_has_a4(hdr->frame_control) && | |
1899 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1900 | !rx->sdata->u.vlan.sta) | |
1901 | return RX_DROP_UNUSABLE; | |
1902 | ||
1903 | if (is_multicast_ether_addr(hdr->addr1) && | |
1904 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1905 | rx->sdata->u.vlan.sta) || | |
1906 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1907 | rx->sdata->u.mgd.use_4addr))) | |
1908 | return RX_DROP_UNUSABLE; | |
1909 | ||
1910 | skb->dev = dev; | |
1911 | __skb_queue_head_init(&frame_list); | |
1912 | ||
1913 | if (skb_linearize(skb)) | |
1914 | return RX_DROP_UNUSABLE; | |
1915 | ||
1916 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, | |
1917 | rx->sdata->vif.type, | |
1918 | rx->local->hw.extra_tx_headroom, true); | |
1919 | ||
1920 | while (!skb_queue_empty(&frame_list)) { | |
1921 | rx->skb = __skb_dequeue(&frame_list); | |
1922 | ||
1923 | if (!ieee80211_frame_allowed(rx, fc)) { | |
1924 | dev_kfree_skb(rx->skb); | |
1925 | continue; | |
1926 | } | |
1927 | dev->stats.rx_packets++; | |
1928 | dev->stats.rx_bytes += rx->skb->len; | |
1929 | ||
1930 | ieee80211_deliver_skb(rx); | |
1931 | } | |
1932 | ||
1933 | return RX_QUEUED; | |
1934 | } | |
1935 | ||
1936 | #ifdef CONFIG_MAC80211_MESH | |
1937 | static ieee80211_rx_result | |
1938 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) | |
1939 | { | |
1940 | struct ieee80211_hdr *fwd_hdr, *hdr; | |
1941 | struct ieee80211_tx_info *info; | |
1942 | struct ieee80211s_hdr *mesh_hdr; | |
1943 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1944 | struct ieee80211_local *local = rx->local; | |
1945 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
1946 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1947 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
1948 | __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD); | |
1949 | u16 q, hdrlen; | |
1950 | ||
1951 | hdr = (struct ieee80211_hdr *) skb->data; | |
1952 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1953 | ||
1954 | /* make sure fixed part of mesh header is there, also checks skb len */ | |
1955 | if (!pskb_may_pull(rx->skb, hdrlen + 6)) | |
1956 | return RX_DROP_MONITOR; | |
1957 | ||
1958 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1959 | ||
1960 | /* make sure full mesh header is there, also checks skb len */ | |
1961 | if (!pskb_may_pull(rx->skb, | |
1962 | hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) | |
1963 | return RX_DROP_MONITOR; | |
1964 | ||
1965 | /* reload pointers */ | |
1966 | hdr = (struct ieee80211_hdr *) skb->data; | |
1967 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1968 | ||
1969 | /* frame is in RMC, don't forward */ | |
1970 | if (ieee80211_is_data(hdr->frame_control) && | |
1971 | is_multicast_ether_addr(hdr->addr1) && | |
1972 | mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata)) | |
1973 | return RX_DROP_MONITOR; | |
1974 | ||
1975 | if (!ieee80211_is_data(hdr->frame_control) || | |
1976 | !(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
1977 | return RX_CONTINUE; | |
1978 | ||
1979 | if (!mesh_hdr->ttl) | |
1980 | return RX_DROP_MONITOR; | |
1981 | ||
1982 | if (mesh_hdr->flags & MESH_FLAGS_AE) { | |
1983 | struct mesh_path *mppath; | |
1984 | char *proxied_addr; | |
1985 | char *mpp_addr; | |
1986 | ||
1987 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1988 | mpp_addr = hdr->addr3; | |
1989 | proxied_addr = mesh_hdr->eaddr1; | |
1990 | } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1991 | /* has_a4 already checked in ieee80211_rx_mesh_check */ | |
1992 | mpp_addr = hdr->addr4; | |
1993 | proxied_addr = mesh_hdr->eaddr2; | |
1994 | } else { | |
1995 | return RX_DROP_MONITOR; | |
1996 | } | |
1997 | ||
1998 | rcu_read_lock(); | |
1999 | mppath = mpp_path_lookup(proxied_addr, sdata); | |
2000 | if (!mppath) { | |
2001 | mpp_path_add(proxied_addr, mpp_addr, sdata); | |
2002 | } else { | |
2003 | spin_lock_bh(&mppath->state_lock); | |
2004 | if (!ether_addr_equal(mppath->mpp, mpp_addr)) | |
2005 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
2006 | spin_unlock_bh(&mppath->state_lock); | |
2007 | } | |
2008 | rcu_read_unlock(); | |
2009 | } | |
2010 | ||
2011 | /* Frame has reached destination. Don't forward */ | |
2012 | if (!is_multicast_ether_addr(hdr->addr1) && | |
2013 | ether_addr_equal(sdata->vif.addr, hdr->addr3)) | |
2014 | return RX_CONTINUE; | |
2015 | ||
2016 | q = ieee80211_select_queue_80211(sdata, skb, hdr); | |
2017 | if (ieee80211_queue_stopped(&local->hw, q)) { | |
2018 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); | |
2019 | return RX_DROP_MONITOR; | |
2020 | } | |
2021 | skb_set_queue_mapping(skb, q); | |
2022 | ||
2023 | if (!--mesh_hdr->ttl) { | |
2024 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); | |
2025 | goto out; | |
2026 | } | |
2027 | ||
2028 | if (!ifmsh->mshcfg.dot11MeshForwarding) | |
2029 | goto out; | |
2030 | ||
2031 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
2032 | if (!fwd_skb) { | |
2033 | net_info_ratelimited("%s: failed to clone mesh frame\n", | |
2034 | sdata->name); | |
2035 | goto out; | |
2036 | } | |
2037 | ||
2038 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
2039 | info = IEEE80211_SKB_CB(fwd_skb); | |
2040 | memset(info, 0, sizeof(*info)); | |
2041 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
2042 | info->control.vif = &rx->sdata->vif; | |
2043 | info->control.jiffies = jiffies; | |
2044 | if (is_multicast_ether_addr(fwd_hdr->addr1)) { | |
2045 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); | |
2046 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
2047 | } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) { | |
2048 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); | |
2049 | } else { | |
2050 | /* unable to resolve next hop */ | |
2051 | mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3, | |
2052 | 0, reason, fwd_hdr->addr2, sdata); | |
2053 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); | |
2054 | kfree_skb(fwd_skb); | |
2055 | return RX_DROP_MONITOR; | |
2056 | } | |
2057 | ||
2058 | IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); | |
2059 | ieee80211_add_pending_skb(local, fwd_skb); | |
2060 | out: | |
2061 | if (is_multicast_ether_addr(hdr->addr1) || | |
2062 | sdata->dev->flags & IFF_PROMISC) | |
2063 | return RX_CONTINUE; | |
2064 | else | |
2065 | return RX_DROP_MONITOR; | |
2066 | } | |
2067 | #endif | |
2068 | ||
2069 | static ieee80211_rx_result debug_noinline | |
2070 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) | |
2071 | { | |
2072 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2073 | struct ieee80211_local *local = rx->local; | |
2074 | struct net_device *dev = sdata->dev; | |
2075 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
2076 | __le16 fc = hdr->frame_control; | |
2077 | bool port_control; | |
2078 | int err; | |
2079 | ||
2080 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) | |
2081 | return RX_CONTINUE; | |
2082 | ||
2083 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) | |
2084 | return RX_DROP_MONITOR; | |
2085 | ||
2086 | /* | |
2087 | * Send unexpected-4addr-frame event to hostapd. For older versions, | |
2088 | * also drop the frame to cooked monitor interfaces. | |
2089 | */ | |
2090 | if (ieee80211_has_a4(hdr->frame_control) && | |
2091 | sdata->vif.type == NL80211_IFTYPE_AP) { | |
2092 | if (rx->sta && | |
2093 | !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) | |
2094 | cfg80211_rx_unexpected_4addr_frame( | |
2095 | rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); | |
2096 | return RX_DROP_MONITOR; | |
2097 | } | |
2098 | ||
2099 | err = __ieee80211_data_to_8023(rx, &port_control); | |
2100 | if (unlikely(err)) | |
2101 | return RX_DROP_UNUSABLE; | |
2102 | ||
2103 | if (!ieee80211_frame_allowed(rx, fc)) | |
2104 | return RX_DROP_MONITOR; | |
2105 | ||
2106 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
2107 | unlikely(port_control) && sdata->bss) { | |
2108 | sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, | |
2109 | u.ap); | |
2110 | dev = sdata->dev; | |
2111 | rx->sdata = sdata; | |
2112 | } | |
2113 | ||
2114 | rx->skb->dev = dev; | |
2115 | ||
2116 | dev->stats.rx_packets++; | |
2117 | dev->stats.rx_bytes += rx->skb->len; | |
2118 | ||
2119 | if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && | |
2120 | !is_multicast_ether_addr( | |
2121 | ((struct ethhdr *)rx->skb->data)->h_dest) && | |
2122 | (!local->scanning && | |
2123 | !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { | |
2124 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
2125 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
2126 | } | |
2127 | ||
2128 | ieee80211_deliver_skb(rx); | |
2129 | ||
2130 | return RX_QUEUED; | |
2131 | } | |
2132 | ||
2133 | static ieee80211_rx_result debug_noinline | |
2134 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) | |
2135 | { | |
2136 | struct sk_buff *skb = rx->skb; | |
2137 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; | |
2138 | struct tid_ampdu_rx *tid_agg_rx; | |
2139 | u16 start_seq_num; | |
2140 | u16 tid; | |
2141 | ||
2142 | if (likely(!ieee80211_is_ctl(bar->frame_control))) | |
2143 | return RX_CONTINUE; | |
2144 | ||
2145 | if (ieee80211_is_back_req(bar->frame_control)) { | |
2146 | struct { | |
2147 | __le16 control, start_seq_num; | |
2148 | } __packed bar_data; | |
2149 | ||
2150 | if (!rx->sta) | |
2151 | return RX_DROP_MONITOR; | |
2152 | ||
2153 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), | |
2154 | &bar_data, sizeof(bar_data))) | |
2155 | return RX_DROP_MONITOR; | |
2156 | ||
2157 | tid = le16_to_cpu(bar_data.control) >> 12; | |
2158 | ||
2159 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); | |
2160 | if (!tid_agg_rx) | |
2161 | return RX_DROP_MONITOR; | |
2162 | ||
2163 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; | |
2164 | ||
2165 | /* reset session timer */ | |
2166 | if (tid_agg_rx->timeout) | |
2167 | mod_timer(&tid_agg_rx->session_timer, | |
2168 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
2169 | ||
2170 | spin_lock(&tid_agg_rx->reorder_lock); | |
2171 | /* release stored frames up to start of BAR */ | |
2172 | ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, | |
2173 | start_seq_num); | |
2174 | spin_unlock(&tid_agg_rx->reorder_lock); | |
2175 | ||
2176 | kfree_skb(skb); | |
2177 | return RX_QUEUED; | |
2178 | } | |
2179 | ||
2180 | /* | |
2181 | * After this point, we only want management frames, | |
2182 | * so we can drop all remaining control frames to | |
2183 | * cooked monitor interfaces. | |
2184 | */ | |
2185 | return RX_DROP_MONITOR; | |
2186 | } | |
2187 | ||
2188 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, | |
2189 | struct ieee80211_mgmt *mgmt, | |
2190 | size_t len) | |
2191 | { | |
2192 | struct ieee80211_local *local = sdata->local; | |
2193 | struct sk_buff *skb; | |
2194 | struct ieee80211_mgmt *resp; | |
2195 | ||
2196 | if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { | |
2197 | /* Not to own unicast address */ | |
2198 | return; | |
2199 | } | |
2200 | ||
2201 | if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) || | |
2202 | !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) { | |
2203 | /* Not from the current AP or not associated yet. */ | |
2204 | return; | |
2205 | } | |
2206 | ||
2207 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
2208 | /* Too short SA Query request frame */ | |
2209 | return; | |
2210 | } | |
2211 | ||
2212 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
2213 | if (skb == NULL) | |
2214 | return; | |
2215 | ||
2216 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2217 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
2218 | memset(resp, 0, 24); | |
2219 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
2220 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); | |
2221 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
2222 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
2223 | IEEE80211_STYPE_ACTION); | |
2224 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
2225 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
2226 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
2227 | memcpy(resp->u.action.u.sa_query.trans_id, | |
2228 | mgmt->u.action.u.sa_query.trans_id, | |
2229 | WLAN_SA_QUERY_TR_ID_LEN); | |
2230 | ||
2231 | ieee80211_tx_skb(sdata, skb); | |
2232 | } | |
2233 | ||
2234 | static ieee80211_rx_result debug_noinline | |
2235 | ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) | |
2236 | { | |
2237 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2238 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
2239 | ||
2240 | /* | |
2241 | * From here on, look only at management frames. | |
2242 | * Data and control frames are already handled, | |
2243 | * and unknown (reserved) frames are useless. | |
2244 | */ | |
2245 | if (rx->skb->len < 24) | |
2246 | return RX_DROP_MONITOR; | |
2247 | ||
2248 | if (!ieee80211_is_mgmt(mgmt->frame_control)) | |
2249 | return RX_DROP_MONITOR; | |
2250 | ||
2251 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && | |
2252 | ieee80211_is_beacon(mgmt->frame_control) && | |
2253 | !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { | |
2254 | int sig = 0; | |
2255 | ||
2256 | if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
2257 | sig = status->signal; | |
2258 | ||
2259 | cfg80211_report_obss_beacon(rx->local->hw.wiphy, | |
2260 | rx->skb->data, rx->skb->len, | |
2261 | status->freq, sig); | |
2262 | rx->flags |= IEEE80211_RX_BEACON_REPORTED; | |
2263 | } | |
2264 | ||
2265 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
2266 | return RX_DROP_MONITOR; | |
2267 | ||
2268 | if (ieee80211_drop_unencrypted_mgmt(rx)) | |
2269 | return RX_DROP_UNUSABLE; | |
2270 | ||
2271 | return RX_CONTINUE; | |
2272 | } | |
2273 | ||
2274 | static ieee80211_rx_result debug_noinline | |
2275 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
2276 | { | |
2277 | struct ieee80211_local *local = rx->local; | |
2278 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2279 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2280 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
2281 | int len = rx->skb->len; | |
2282 | ||
2283 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2284 | return RX_CONTINUE; | |
2285 | ||
2286 | /* drop too small frames */ | |
2287 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
2288 | return RX_DROP_UNUSABLE; | |
2289 | ||
2290 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) | |
2291 | return RX_DROP_UNUSABLE; | |
2292 | ||
2293 | if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) | |
2294 | return RX_DROP_UNUSABLE; | |
2295 | ||
2296 | switch (mgmt->u.action.category) { | |
2297 | case WLAN_CATEGORY_HT: | |
2298 | /* reject HT action frames from stations not supporting HT */ | |
2299 | if (!rx->sta->sta.ht_cap.ht_supported) | |
2300 | goto invalid; | |
2301 | ||
2302 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2303 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && | |
2304 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2305 | sdata->vif.type != NL80211_IFTYPE_AP && | |
2306 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2307 | break; | |
2308 | ||
2309 | /* verify action & smps_control are present */ | |
2310 | if (len < IEEE80211_MIN_ACTION_SIZE + 2) | |
2311 | goto invalid; | |
2312 | ||
2313 | switch (mgmt->u.action.u.ht_smps.action) { | |
2314 | case WLAN_HT_ACTION_SMPS: { | |
2315 | struct ieee80211_supported_band *sband; | |
2316 | u8 smps; | |
2317 | ||
2318 | /* convert to HT capability */ | |
2319 | switch (mgmt->u.action.u.ht_smps.smps_control) { | |
2320 | case WLAN_HT_SMPS_CONTROL_DISABLED: | |
2321 | smps = WLAN_HT_CAP_SM_PS_DISABLED; | |
2322 | break; | |
2323 | case WLAN_HT_SMPS_CONTROL_STATIC: | |
2324 | smps = WLAN_HT_CAP_SM_PS_STATIC; | |
2325 | break; | |
2326 | case WLAN_HT_SMPS_CONTROL_DYNAMIC: | |
2327 | smps = WLAN_HT_CAP_SM_PS_DYNAMIC; | |
2328 | break; | |
2329 | default: | |
2330 | goto invalid; | |
2331 | } | |
2332 | smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT; | |
2333 | ||
2334 | /* if no change do nothing */ | |
2335 | if ((rx->sta->sta.ht_cap.cap & | |
2336 | IEEE80211_HT_CAP_SM_PS) == smps) | |
2337 | goto handled; | |
2338 | ||
2339 | rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS; | |
2340 | rx->sta->sta.ht_cap.cap |= smps; | |
2341 | ||
2342 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2343 | ||
2344 | rate_control_rate_update(local, sband, rx->sta, | |
2345 | IEEE80211_RC_SMPS_CHANGED); | |
2346 | goto handled; | |
2347 | } | |
2348 | default: | |
2349 | goto invalid; | |
2350 | } | |
2351 | ||
2352 | break; | |
2353 | case WLAN_CATEGORY_BACK: | |
2354 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
2355 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT && | |
2356 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
2357 | sdata->vif.type != NL80211_IFTYPE_AP && | |
2358 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2359 | break; | |
2360 | ||
2361 | /* verify action_code is present */ | |
2362 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2363 | break; | |
2364 | ||
2365 | switch (mgmt->u.action.u.addba_req.action_code) { | |
2366 | case WLAN_ACTION_ADDBA_REQ: | |
2367 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2368 | sizeof(mgmt->u.action.u.addba_req))) | |
2369 | goto invalid; | |
2370 | break; | |
2371 | case WLAN_ACTION_ADDBA_RESP: | |
2372 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2373 | sizeof(mgmt->u.action.u.addba_resp))) | |
2374 | goto invalid; | |
2375 | break; | |
2376 | case WLAN_ACTION_DELBA: | |
2377 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2378 | sizeof(mgmt->u.action.u.delba))) | |
2379 | goto invalid; | |
2380 | break; | |
2381 | default: | |
2382 | goto invalid; | |
2383 | } | |
2384 | ||
2385 | goto queue; | |
2386 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
2387 | if (status->band != IEEE80211_BAND_5GHZ) | |
2388 | break; | |
2389 | ||
2390 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2391 | break; | |
2392 | ||
2393 | /* verify action_code is present */ | |
2394 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
2395 | break; | |
2396 | ||
2397 | switch (mgmt->u.action.u.measurement.action_code) { | |
2398 | case WLAN_ACTION_SPCT_MSR_REQ: | |
2399 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2400 | sizeof(mgmt->u.action.u.measurement))) | |
2401 | break; | |
2402 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
2403 | goto handled; | |
2404 | case WLAN_ACTION_SPCT_CHL_SWITCH: | |
2405 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2406 | sizeof(mgmt->u.action.u.chan_switch))) | |
2407 | break; | |
2408 | ||
2409 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2410 | break; | |
2411 | ||
2412 | if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) | |
2413 | break; | |
2414 | ||
2415 | goto queue; | |
2416 | } | |
2417 | break; | |
2418 | case WLAN_CATEGORY_SA_QUERY: | |
2419 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2420 | sizeof(mgmt->u.action.u.sa_query))) | |
2421 | break; | |
2422 | ||
2423 | switch (mgmt->u.action.u.sa_query.action) { | |
2424 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
2425 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2426 | break; | |
2427 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
2428 | goto handled; | |
2429 | } | |
2430 | break; | |
2431 | case WLAN_CATEGORY_SELF_PROTECTED: | |
2432 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2433 | sizeof(mgmt->u.action.u.self_prot.action_code))) | |
2434 | break; | |
2435 | ||
2436 | switch (mgmt->u.action.u.self_prot.action_code) { | |
2437 | case WLAN_SP_MESH_PEERING_OPEN: | |
2438 | case WLAN_SP_MESH_PEERING_CLOSE: | |
2439 | case WLAN_SP_MESH_PEERING_CONFIRM: | |
2440 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
2441 | goto invalid; | |
2442 | if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE) | |
2443 | /* userspace handles this frame */ | |
2444 | break; | |
2445 | goto queue; | |
2446 | case WLAN_SP_MGK_INFORM: | |
2447 | case WLAN_SP_MGK_ACK: | |
2448 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
2449 | goto invalid; | |
2450 | break; | |
2451 | } | |
2452 | break; | |
2453 | case WLAN_CATEGORY_MESH_ACTION: | |
2454 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
2455 | sizeof(mgmt->u.action.u.mesh_action.action_code))) | |
2456 | break; | |
2457 | ||
2458 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
2459 | break; | |
2460 | if (mesh_action_is_path_sel(mgmt) && | |
2461 | !mesh_path_sel_is_hwmp(sdata)) | |
2462 | break; | |
2463 | goto queue; | |
2464 | } | |
2465 | ||
2466 | return RX_CONTINUE; | |
2467 | ||
2468 | invalid: | |
2469 | status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; | |
2470 | /* will return in the next handlers */ | |
2471 | return RX_CONTINUE; | |
2472 | ||
2473 | handled: | |
2474 | if (rx->sta) | |
2475 | rx->sta->rx_packets++; | |
2476 | dev_kfree_skb(rx->skb); | |
2477 | return RX_QUEUED; | |
2478 | ||
2479 | queue: | |
2480 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2481 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2482 | ieee80211_queue_work(&local->hw, &sdata->work); | |
2483 | if (rx->sta) | |
2484 | rx->sta->rx_packets++; | |
2485 | return RX_QUEUED; | |
2486 | } | |
2487 | ||
2488 | static ieee80211_rx_result debug_noinline | |
2489 | ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) | |
2490 | { | |
2491 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
2492 | int sig = 0; | |
2493 | ||
2494 | /* skip known-bad action frames and return them in the next handler */ | |
2495 | if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) | |
2496 | return RX_CONTINUE; | |
2497 | ||
2498 | /* | |
2499 | * Getting here means the kernel doesn't know how to handle | |
2500 | * it, but maybe userspace does ... include returned frames | |
2501 | * so userspace can register for those to know whether ones | |
2502 | * it transmitted were processed or returned. | |
2503 | */ | |
2504 | ||
2505 | if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
2506 | sig = status->signal; | |
2507 | ||
2508 | if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig, | |
2509 | rx->skb->data, rx->skb->len, | |
2510 | GFP_ATOMIC)) { | |
2511 | if (rx->sta) | |
2512 | rx->sta->rx_packets++; | |
2513 | dev_kfree_skb(rx->skb); | |
2514 | return RX_QUEUED; | |
2515 | } | |
2516 | ||
2517 | return RX_CONTINUE; | |
2518 | } | |
2519 | ||
2520 | static ieee80211_rx_result debug_noinline | |
2521 | ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) | |
2522 | { | |
2523 | struct ieee80211_local *local = rx->local; | |
2524 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
2525 | struct sk_buff *nskb; | |
2526 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2527 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
2528 | ||
2529 | if (!ieee80211_is_action(mgmt->frame_control)) | |
2530 | return RX_CONTINUE; | |
2531 | ||
2532 | /* | |
2533 | * For AP mode, hostapd is responsible for handling any action | |
2534 | * frames that we didn't handle, including returning unknown | |
2535 | * ones. For all other modes we will return them to the sender, | |
2536 | * setting the 0x80 bit in the action category, as required by | |
2537 | * 802.11-2012 9.24.4. | |
2538 | * Newer versions of hostapd shall also use the management frame | |
2539 | * registration mechanisms, but older ones still use cooked | |
2540 | * monitor interfaces so push all frames there. | |
2541 | */ | |
2542 | if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && | |
2543 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
2544 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) | |
2545 | return RX_DROP_MONITOR; | |
2546 | ||
2547 | if (is_multicast_ether_addr(mgmt->da)) | |
2548 | return RX_DROP_MONITOR; | |
2549 | ||
2550 | /* do not return rejected action frames */ | |
2551 | if (mgmt->u.action.category & 0x80) | |
2552 | return RX_DROP_UNUSABLE; | |
2553 | ||
2554 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2555 | GFP_ATOMIC); | |
2556 | if (nskb) { | |
2557 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; | |
2558 | ||
2559 | nmgmt->u.action.category |= 0x80; | |
2560 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); | |
2561 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
2562 | ||
2563 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2564 | ||
2565 | ieee80211_tx_skb(rx->sdata, nskb); | |
2566 | } | |
2567 | dev_kfree_skb(rx->skb); | |
2568 | return RX_QUEUED; | |
2569 | } | |
2570 | ||
2571 | static ieee80211_rx_result debug_noinline | |
2572 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) | |
2573 | { | |
2574 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2575 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; | |
2576 | __le16 stype; | |
2577 | ||
2578 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); | |
2579 | ||
2580 | if (!ieee80211_vif_is_mesh(&sdata->vif) && | |
2581 | sdata->vif.type != NL80211_IFTYPE_ADHOC && | |
2582 | sdata->vif.type != NL80211_IFTYPE_STATION) | |
2583 | return RX_DROP_MONITOR; | |
2584 | ||
2585 | switch (stype) { | |
2586 | case cpu_to_le16(IEEE80211_STYPE_AUTH): | |
2587 | case cpu_to_le16(IEEE80211_STYPE_BEACON): | |
2588 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): | |
2589 | /* process for all: mesh, mlme, ibss */ | |
2590 | break; | |
2591 | case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): | |
2592 | case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): | |
2593 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): | |
2594 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): | |
2595 | if (is_multicast_ether_addr(mgmt->da) && | |
2596 | !is_broadcast_ether_addr(mgmt->da)) | |
2597 | return RX_DROP_MONITOR; | |
2598 | ||
2599 | /* process only for station */ | |
2600 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
2601 | return RX_DROP_MONITOR; | |
2602 | break; | |
2603 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): | |
2604 | /* process only for ibss */ | |
2605 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
2606 | return RX_DROP_MONITOR; | |
2607 | break; | |
2608 | default: | |
2609 | return RX_DROP_MONITOR; | |
2610 | } | |
2611 | ||
2612 | /* queue up frame and kick off work to process it */ | |
2613 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; | |
2614 | skb_queue_tail(&sdata->skb_queue, rx->skb); | |
2615 | ieee80211_queue_work(&rx->local->hw, &sdata->work); | |
2616 | if (rx->sta) | |
2617 | rx->sta->rx_packets++; | |
2618 | ||
2619 | return RX_QUEUED; | |
2620 | } | |
2621 | ||
2622 | /* TODO: use IEEE80211_RX_FRAGMENTED */ | |
2623 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, | |
2624 | struct ieee80211_rate *rate) | |
2625 | { | |
2626 | struct ieee80211_sub_if_data *sdata; | |
2627 | struct ieee80211_local *local = rx->local; | |
2628 | struct sk_buff *skb = rx->skb, *skb2; | |
2629 | struct net_device *prev_dev = NULL; | |
2630 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2631 | int needed_headroom; | |
2632 | ||
2633 | /* | |
2634 | * If cooked monitor has been processed already, then | |
2635 | * don't do it again. If not, set the flag. | |
2636 | */ | |
2637 | if (rx->flags & IEEE80211_RX_CMNTR) | |
2638 | goto out_free_skb; | |
2639 | rx->flags |= IEEE80211_RX_CMNTR; | |
2640 | ||
2641 | /* If there are no cooked monitor interfaces, just free the SKB */ | |
2642 | if (!local->cooked_mntrs) | |
2643 | goto out_free_skb; | |
2644 | ||
2645 | /* room for the radiotap header based on driver features */ | |
2646 | needed_headroom = ieee80211_rx_radiotap_space(local, status); | |
2647 | ||
2648 | if (skb_headroom(skb) < needed_headroom && | |
2649 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) | |
2650 | goto out_free_skb; | |
2651 | ||
2652 | /* prepend radiotap information */ | |
2653 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, | |
2654 | false); | |
2655 | ||
2656 | skb_set_mac_header(skb, 0); | |
2657 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2658 | skb->pkt_type = PACKET_OTHERHOST; | |
2659 | skb->protocol = htons(ETH_P_802_2); | |
2660 | ||
2661 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
2662 | if (!ieee80211_sdata_running(sdata)) | |
2663 | continue; | |
2664 | ||
2665 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || | |
2666 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) | |
2667 | continue; | |
2668 | ||
2669 | if (prev_dev) { | |
2670 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2671 | if (skb2) { | |
2672 | skb2->dev = prev_dev; | |
2673 | netif_receive_skb(skb2); | |
2674 | } | |
2675 | } | |
2676 | ||
2677 | prev_dev = sdata->dev; | |
2678 | sdata->dev->stats.rx_packets++; | |
2679 | sdata->dev->stats.rx_bytes += skb->len; | |
2680 | } | |
2681 | ||
2682 | if (prev_dev) { | |
2683 | skb->dev = prev_dev; | |
2684 | netif_receive_skb(skb); | |
2685 | return; | |
2686 | } | |
2687 | ||
2688 | out_free_skb: | |
2689 | dev_kfree_skb(skb); | |
2690 | } | |
2691 | ||
2692 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, | |
2693 | ieee80211_rx_result res) | |
2694 | { | |
2695 | switch (res) { | |
2696 | case RX_DROP_MONITOR: | |
2697 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2698 | if (rx->sta) | |
2699 | rx->sta->rx_dropped++; | |
2700 | /* fall through */ | |
2701 | case RX_CONTINUE: { | |
2702 | struct ieee80211_rate *rate = NULL; | |
2703 | struct ieee80211_supported_band *sband; | |
2704 | struct ieee80211_rx_status *status; | |
2705 | ||
2706 | status = IEEE80211_SKB_RXCB((rx->skb)); | |
2707 | ||
2708 | sband = rx->local->hw.wiphy->bands[status->band]; | |
2709 | if (!(status->flag & RX_FLAG_HT)) | |
2710 | rate = &sband->bitrates[status->rate_idx]; | |
2711 | ||
2712 | ieee80211_rx_cooked_monitor(rx, rate); | |
2713 | break; | |
2714 | } | |
2715 | case RX_DROP_UNUSABLE: | |
2716 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); | |
2717 | if (rx->sta) | |
2718 | rx->sta->rx_dropped++; | |
2719 | dev_kfree_skb(rx->skb); | |
2720 | break; | |
2721 | case RX_QUEUED: | |
2722 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); | |
2723 | break; | |
2724 | } | |
2725 | } | |
2726 | ||
2727 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) | |
2728 | { | |
2729 | ieee80211_rx_result res = RX_DROP_MONITOR; | |
2730 | struct sk_buff *skb; | |
2731 | ||
2732 | #define CALL_RXH(rxh) \ | |
2733 | do { \ | |
2734 | res = rxh(rx); \ | |
2735 | if (res != RX_CONTINUE) \ | |
2736 | goto rxh_next; \ | |
2737 | } while (0); | |
2738 | ||
2739 | spin_lock(&rx->local->rx_skb_queue.lock); | |
2740 | if (rx->local->running_rx_handler) | |
2741 | goto unlock; | |
2742 | ||
2743 | rx->local->running_rx_handler = true; | |
2744 | ||
2745 | while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { | |
2746 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2747 | ||
2748 | /* | |
2749 | * all the other fields are valid across frames | |
2750 | * that belong to an aMPDU since they are on the | |
2751 | * same TID from the same station | |
2752 | */ | |
2753 | rx->skb = skb; | |
2754 | ||
2755 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2756 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2757 | CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll) | |
2758 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2759 | CALL_RXH(ieee80211_rx_h_defragment) | |
2760 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2761 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2762 | #ifdef CONFIG_MAC80211_MESH | |
2763 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) | |
2764 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
2765 | #endif | |
2766 | CALL_RXH(ieee80211_rx_h_amsdu) | |
2767 | CALL_RXH(ieee80211_rx_h_data) | |
2768 | CALL_RXH(ieee80211_rx_h_ctrl); | |
2769 | CALL_RXH(ieee80211_rx_h_mgmt_check) | |
2770 | CALL_RXH(ieee80211_rx_h_action) | |
2771 | CALL_RXH(ieee80211_rx_h_userspace_mgmt) | |
2772 | CALL_RXH(ieee80211_rx_h_action_return) | |
2773 | CALL_RXH(ieee80211_rx_h_mgmt) | |
2774 | ||
2775 | rxh_next: | |
2776 | ieee80211_rx_handlers_result(rx, res); | |
2777 | spin_lock(&rx->local->rx_skb_queue.lock); | |
2778 | #undef CALL_RXH | |
2779 | } | |
2780 | ||
2781 | rx->local->running_rx_handler = false; | |
2782 | ||
2783 | unlock: | |
2784 | spin_unlock(&rx->local->rx_skb_queue.lock); | |
2785 | } | |
2786 | ||
2787 | static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) | |
2788 | { | |
2789 | ieee80211_rx_result res = RX_DROP_MONITOR; | |
2790 | ||
2791 | #define CALL_RXH(rxh) \ | |
2792 | do { \ | |
2793 | res = rxh(rx); \ | |
2794 | if (res != RX_CONTINUE) \ | |
2795 | goto rxh_next; \ | |
2796 | } while (0); | |
2797 | ||
2798 | CALL_RXH(ieee80211_rx_h_check) | |
2799 | ||
2800 | ieee80211_rx_reorder_ampdu(rx); | |
2801 | ||
2802 | ieee80211_rx_handlers(rx); | |
2803 | return; | |
2804 | ||
2805 | rxh_next: | |
2806 | ieee80211_rx_handlers_result(rx, res); | |
2807 | ||
2808 | #undef CALL_RXH | |
2809 | } | |
2810 | ||
2811 | /* | |
2812 | * This function makes calls into the RX path, therefore | |
2813 | * it has to be invoked under RCU read lock. | |
2814 | */ | |
2815 | void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) | |
2816 | { | |
2817 | struct ieee80211_rx_data rx = { | |
2818 | .sta = sta, | |
2819 | .sdata = sta->sdata, | |
2820 | .local = sta->local, | |
2821 | /* This is OK -- must be QoS data frame */ | |
2822 | .security_idx = tid, | |
2823 | .seqno_idx = tid, | |
2824 | .flags = 0, | |
2825 | }; | |
2826 | struct tid_ampdu_rx *tid_agg_rx; | |
2827 | ||
2828 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); | |
2829 | if (!tid_agg_rx) | |
2830 | return; | |
2831 | ||
2832 | spin_lock(&tid_agg_rx->reorder_lock); | |
2833 | ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx); | |
2834 | spin_unlock(&tid_agg_rx->reorder_lock); | |
2835 | ||
2836 | ieee80211_rx_handlers(&rx); | |
2837 | } | |
2838 | ||
2839 | /* main receive path */ | |
2840 | ||
2841 | static int prepare_for_handlers(struct ieee80211_rx_data *rx, | |
2842 | struct ieee80211_hdr *hdr) | |
2843 | { | |
2844 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2845 | struct sk_buff *skb = rx->skb; | |
2846 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2847 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
2848 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
2849 | ||
2850 | switch (sdata->vif.type) { | |
2851 | case NL80211_IFTYPE_STATION: | |
2852 | if (!bssid && !sdata->u.mgd.use_4addr) | |
2853 | return 0; | |
2854 | if (!multicast && | |
2855 | !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { | |
2856 | if (!(sdata->dev->flags & IFF_PROMISC) || | |
2857 | sdata->u.mgd.use_4addr) | |
2858 | return 0; | |
2859 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; | |
2860 | } | |
2861 | break; | |
2862 | case NL80211_IFTYPE_ADHOC: | |
2863 | if (!bssid) | |
2864 | return 0; | |
2865 | if (ieee80211_is_beacon(hdr->frame_control)) { | |
2866 | return 1; | |
2867 | } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { | |
2868 | return 0; | |
2869 | } else if (!multicast && | |
2870 | !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { | |
2871 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2872 | return 0; | |
2873 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; | |
2874 | } else if (!rx->sta) { | |
2875 | int rate_idx; | |
2876 | if (status->flag & RX_FLAG_HT) | |
2877 | rate_idx = 0; /* TODO: HT rates */ | |
2878 | else | |
2879 | rate_idx = status->rate_idx; | |
2880 | ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, | |
2881 | BIT(rate_idx)); | |
2882 | } | |
2883 | break; | |
2884 | case NL80211_IFTYPE_MESH_POINT: | |
2885 | if (!multicast && | |
2886 | !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { | |
2887 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2888 | return 0; | |
2889 | ||
2890 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; | |
2891 | } | |
2892 | break; | |
2893 | case NL80211_IFTYPE_AP_VLAN: | |
2894 | case NL80211_IFTYPE_AP: | |
2895 | if (!bssid) { | |
2896 | if (!ether_addr_equal(sdata->vif.addr, hdr->addr1)) | |
2897 | return 0; | |
2898 | } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) { | |
2899 | /* | |
2900 | * Accept public action frames even when the | |
2901 | * BSSID doesn't match, this is used for P2P | |
2902 | * and location updates. Note that mac80211 | |
2903 | * itself never looks at these frames. | |
2904 | */ | |
2905 | if (ieee80211_is_public_action(hdr, skb->len)) | |
2906 | return 1; | |
2907 | if (!ieee80211_is_beacon(hdr->frame_control)) | |
2908 | return 0; | |
2909 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; | |
2910 | } | |
2911 | break; | |
2912 | case NL80211_IFTYPE_WDS: | |
2913 | if (bssid || !ieee80211_is_data(hdr->frame_control)) | |
2914 | return 0; | |
2915 | if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2)) | |
2916 | return 0; | |
2917 | break; | |
2918 | case NL80211_IFTYPE_P2P_DEVICE: | |
2919 | if (!ieee80211_is_public_action(hdr, skb->len) && | |
2920 | !ieee80211_is_probe_req(hdr->frame_control) && | |
2921 | !ieee80211_is_probe_resp(hdr->frame_control) && | |
2922 | !ieee80211_is_beacon(hdr->frame_control)) | |
2923 | return 0; | |
2924 | if (!ether_addr_equal(sdata->vif.addr, hdr->addr1)) | |
2925 | status->rx_flags &= ~IEEE80211_RX_RA_MATCH; | |
2926 | break; | |
2927 | default: | |
2928 | /* should never get here */ | |
2929 | WARN_ON_ONCE(1); | |
2930 | break; | |
2931 | } | |
2932 | ||
2933 | return 1; | |
2934 | } | |
2935 | ||
2936 | /* | |
2937 | * This function returns whether or not the SKB | |
2938 | * was destined for RX processing or not, which, | |
2939 | * if consume is true, is equivalent to whether | |
2940 | * or not the skb was consumed. | |
2941 | */ | |
2942 | static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, | |
2943 | struct sk_buff *skb, bool consume) | |
2944 | { | |
2945 | struct ieee80211_local *local = rx->local; | |
2946 | struct ieee80211_sub_if_data *sdata = rx->sdata; | |
2947 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2948 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2949 | int prepares; | |
2950 | ||
2951 | rx->skb = skb; | |
2952 | status->rx_flags |= IEEE80211_RX_RA_MATCH; | |
2953 | prepares = prepare_for_handlers(rx, hdr); | |
2954 | ||
2955 | if (!prepares) | |
2956 | return false; | |
2957 | ||
2958 | if (!consume) { | |
2959 | skb = skb_copy(skb, GFP_ATOMIC); | |
2960 | if (!skb) { | |
2961 | if (net_ratelimit()) | |
2962 | wiphy_debug(local->hw.wiphy, | |
2963 | "failed to copy skb for %s\n", | |
2964 | sdata->name); | |
2965 | return true; | |
2966 | } | |
2967 | ||
2968 | rx->skb = skb; | |
2969 | } | |
2970 | ||
2971 | ieee80211_invoke_rx_handlers(rx); | |
2972 | return true; | |
2973 | } | |
2974 | ||
2975 | /* | |
2976 | * This is the actual Rx frames handler. as it blongs to Rx path it must | |
2977 | * be called with rcu_read_lock protection. | |
2978 | */ | |
2979 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, | |
2980 | struct sk_buff *skb) | |
2981 | { | |
2982 | struct ieee80211_local *local = hw_to_local(hw); | |
2983 | struct ieee80211_sub_if_data *sdata; | |
2984 | struct ieee80211_hdr *hdr; | |
2985 | __le16 fc; | |
2986 | struct ieee80211_rx_data rx; | |
2987 | struct ieee80211_sub_if_data *prev; | |
2988 | struct sta_info *sta, *tmp, *prev_sta; | |
2989 | int err = 0; | |
2990 | ||
2991 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; | |
2992 | memset(&rx, 0, sizeof(rx)); | |
2993 | rx.skb = skb; | |
2994 | rx.local = local; | |
2995 | ||
2996 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) | |
2997 | local->dot11ReceivedFragmentCount++; | |
2998 | ||
2999 | if (ieee80211_is_mgmt(fc)) { | |
3000 | /* drop frame if too short for header */ | |
3001 | if (skb->len < ieee80211_hdrlen(fc)) | |
3002 | err = -ENOBUFS; | |
3003 | else | |
3004 | err = skb_linearize(skb); | |
3005 | } else { | |
3006 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
3007 | } | |
3008 | ||
3009 | if (err) { | |
3010 | dev_kfree_skb(skb); | |
3011 | return; | |
3012 | } | |
3013 | ||
3014 | hdr = (struct ieee80211_hdr *)skb->data; | |
3015 | ieee80211_parse_qos(&rx); | |
3016 | ieee80211_verify_alignment(&rx); | |
3017 | ||
3018 | if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || | |
3019 | ieee80211_is_beacon(hdr->frame_control))) | |
3020 | ieee80211_scan_rx(local, skb); | |
3021 | ||
3022 | if (ieee80211_is_data(fc)) { | |
3023 | prev_sta = NULL; | |
3024 | ||
3025 | for_each_sta_info(local, hdr->addr2, sta, tmp) { | |
3026 | if (!prev_sta) { | |
3027 | prev_sta = sta; | |
3028 | continue; | |
3029 | } | |
3030 | ||
3031 | rx.sta = prev_sta; | |
3032 | rx.sdata = prev_sta->sdata; | |
3033 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
3034 | ||
3035 | prev_sta = sta; | |
3036 | } | |
3037 | ||
3038 | if (prev_sta) { | |
3039 | rx.sta = prev_sta; | |
3040 | rx.sdata = prev_sta->sdata; | |
3041 | ||
3042 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) | |
3043 | return; | |
3044 | goto out; | |
3045 | } | |
3046 | } | |
3047 | ||
3048 | prev = NULL; | |
3049 | ||
3050 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
3051 | if (!ieee80211_sdata_running(sdata)) | |
3052 | continue; | |
3053 | ||
3054 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || | |
3055 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
3056 | continue; | |
3057 | ||
3058 | /* | |
3059 | * frame is destined for this interface, but if it's | |
3060 | * not also for the previous one we handle that after | |
3061 | * the loop to avoid copying the SKB once too much | |
3062 | */ | |
3063 | ||
3064 | if (!prev) { | |
3065 | prev = sdata; | |
3066 | continue; | |
3067 | } | |
3068 | ||
3069 | rx.sta = sta_info_get_bss(prev, hdr->addr2); | |
3070 | rx.sdata = prev; | |
3071 | ieee80211_prepare_and_rx_handle(&rx, skb, false); | |
3072 | ||
3073 | prev = sdata; | |
3074 | } | |
3075 | ||
3076 | if (prev) { | |
3077 | rx.sta = sta_info_get_bss(prev, hdr->addr2); | |
3078 | rx.sdata = prev; | |
3079 | ||
3080 | if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) | |
3081 | return; | |
3082 | } | |
3083 | ||
3084 | out: | |
3085 | dev_kfree_skb(skb); | |
3086 | } | |
3087 | ||
3088 | /* | |
3089 | * This is the receive path handler. It is called by a low level driver when an | |
3090 | * 802.11 MPDU is received from the hardware. | |
3091 | */ | |
3092 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) | |
3093 | { | |
3094 | struct ieee80211_local *local = hw_to_local(hw); | |
3095 | struct ieee80211_rate *rate = NULL; | |
3096 | struct ieee80211_supported_band *sband; | |
3097 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
3098 | ||
3099 | WARN_ON_ONCE(softirq_count() == 0); | |
3100 | ||
3101 | if (WARN_ON(status->band >= IEEE80211_NUM_BANDS)) | |
3102 | goto drop; | |
3103 | ||
3104 | sband = local->hw.wiphy->bands[status->band]; | |
3105 | if (WARN_ON(!sband)) | |
3106 | goto drop; | |
3107 | ||
3108 | /* | |
3109 | * If we're suspending, it is possible although not too likely | |
3110 | * that we'd be receiving frames after having already partially | |
3111 | * quiesced the stack. We can't process such frames then since | |
3112 | * that might, for example, cause stations to be added or other | |
3113 | * driver callbacks be invoked. | |
3114 | */ | |
3115 | if (unlikely(local->quiescing || local->suspended)) | |
3116 | goto drop; | |
3117 | ||
3118 | /* We might be during a HW reconfig, prevent Rx for the same reason */ | |
3119 | if (unlikely(local->in_reconfig)) | |
3120 | goto drop; | |
3121 | ||
3122 | /* | |
3123 | * The same happens when we're not even started, | |
3124 | * but that's worth a warning. | |
3125 | */ | |
3126 | if (WARN_ON(!local->started)) | |
3127 | goto drop; | |
3128 | ||
3129 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { | |
3130 | /* | |
3131 | * Validate the rate, unless a PLCP error means that | |
3132 | * we probably can't have a valid rate here anyway. | |
3133 | */ | |
3134 | ||
3135 | if (status->flag & RX_FLAG_HT) { | |
3136 | /* | |
3137 | * rate_idx is MCS index, which can be [0-76] | |
3138 | * as documented on: | |
3139 | * | |
3140 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
3141 | * | |
3142 | * Anything else would be some sort of driver or | |
3143 | * hardware error. The driver should catch hardware | |
3144 | * errors. | |
3145 | */ | |
3146 | if (WARN(status->rate_idx > 76, | |
3147 | "Rate marked as an HT rate but passed " | |
3148 | "status->rate_idx is not " | |
3149 | "an MCS index [0-76]: %d (0x%02x)\n", | |
3150 | status->rate_idx, | |
3151 | status->rate_idx)) | |
3152 | goto drop; | |
3153 | } else { | |
3154 | if (WARN_ON(status->rate_idx >= sband->n_bitrates)) | |
3155 | goto drop; | |
3156 | rate = &sband->bitrates[status->rate_idx]; | |
3157 | } | |
3158 | } | |
3159 | ||
3160 | status->rx_flags = 0; | |
3161 | ||
3162 | /* | |
3163 | * key references and virtual interfaces are protected using RCU | |
3164 | * and this requires that we are in a read-side RCU section during | |
3165 | * receive processing | |
3166 | */ | |
3167 | rcu_read_lock(); | |
3168 | ||
3169 | /* | |
3170 | * Frames with failed FCS/PLCP checksum are not returned, | |
3171 | * all other frames are returned without radiotap header | |
3172 | * if it was previously present. | |
3173 | * Also, frames with less than 16 bytes are dropped. | |
3174 | */ | |
3175 | skb = ieee80211_rx_monitor(local, skb, rate); | |
3176 | if (!skb) { | |
3177 | rcu_read_unlock(); | |
3178 | return; | |
3179 | } | |
3180 | ||
3181 | ieee80211_tpt_led_trig_rx(local, | |
3182 | ((struct ieee80211_hdr *)skb->data)->frame_control, | |
3183 | skb->len); | |
3184 | __ieee80211_rx_handle_packet(hw, skb); | |
3185 | ||
3186 | rcu_read_unlock(); | |
3187 | ||
3188 | return; | |
3189 | drop: | |
3190 | kfree_skb(skb); | |
3191 | } | |
3192 | EXPORT_SYMBOL(ieee80211_rx); | |
3193 | ||
3194 | /* This is a version of the rx handler that can be called from hard irq | |
3195 | * context. Post the skb on the queue and schedule the tasklet */ | |
3196 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) | |
3197 | { | |
3198 | struct ieee80211_local *local = hw_to_local(hw); | |
3199 | ||
3200 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
3201 | ||
3202 | skb->pkt_type = IEEE80211_RX_MSG; | |
3203 | skb_queue_tail(&local->skb_queue, skb); | |
3204 | tasklet_schedule(&local->tasklet); | |
3205 | } | |
3206 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |