Commit | Line | Data |
---|---|---|
571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
84040805 | 5 | * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> |
571ecf67 JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
b2e7771e JB |
30 | /* |
31 | * monitor mode reception | |
32 | * | |
33 | * This function cleans up the SKB, i.e. it removes all the stuff | |
34 | * only useful for monitoring. | |
35 | */ | |
36 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 37 | struct sk_buff *skb) |
b2e7771e | 38 | { |
b2e7771e JB |
39 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
40 | if (likely(skb->len > FCS_LEN)) | |
41 | skb_trim(skb, skb->len - FCS_LEN); | |
42 | else { | |
43 | /* driver bug */ | |
44 | WARN_ON(1); | |
45 | dev_kfree_skb(skb); | |
46 | skb = NULL; | |
47 | } | |
48 | } | |
49 | ||
50 | return skb; | |
51 | } | |
52 | ||
f1d58c25 | 53 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 54 | int present_fcs_len) |
b2e7771e | 55 | { |
f1d58c25 | 56 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 57 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
58 | |
59 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
60 | return 1; | |
0869aea0 | 61 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 62 | return 1; |
87228f57 HH |
63 | if (ieee80211_is_ctl(hdr->frame_control) && |
64 | !ieee80211_is_pspoll(hdr->frame_control) && | |
65 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
66 | return 1; |
67 | return 0; | |
68 | } | |
69 | ||
601ae7f2 BR |
70 | static int |
71 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
72 | struct ieee80211_rx_status *status) | |
73 | { | |
74 | int len; | |
75 | ||
76 | /* always present fields */ | |
77 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
78 | ||
79 | if (status->flag & RX_FLAG_TSFT) | |
80 | len += 8; | |
7fee5372 | 81 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
82 | len += 1; |
83 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
84 | len += 1; | |
85 | ||
86 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
87 | len++; | |
88 | ||
601ae7f2 BR |
89 | return len; |
90 | } | |
91 | ||
d1c3a37c | 92 | /* |
601ae7f2 BR |
93 | * ieee80211_add_rx_radiotap_header - add radiotap header |
94 | * | |
95 | * add a radiotap header containing all the fields which the hardware provided. | |
96 | */ | |
97 | static void | |
98 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
99 | struct sk_buff *skb, | |
601ae7f2 BR |
100 | struct ieee80211_rate *rate, |
101 | int rtap_len) | |
102 | { | |
f1d58c25 | 103 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
104 | struct ieee80211_radiotap_header *rthdr; |
105 | unsigned char *pos; | |
6a86b9c7 | 106 | u16 rx_flags = 0; |
601ae7f2 BR |
107 | |
108 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
109 | memset(rthdr, 0, rtap_len); | |
110 | ||
111 | /* radiotap header, set always present flags */ | |
112 | rthdr->it_present = | |
113 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
114 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
115 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
116 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
117 | rthdr->it_len = cpu_to_le16(rtap_len); | |
118 | ||
119 | pos = (unsigned char *)(rthdr+1); | |
120 | ||
121 | /* the order of the following fields is important */ | |
122 | ||
123 | /* IEEE80211_RADIOTAP_TSFT */ | |
124 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 125 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
126 | rthdr->it_present |= |
127 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
128 | pos += 8; | |
129 | } | |
130 | ||
131 | /* IEEE80211_RADIOTAP_FLAGS */ | |
132 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
133 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
134 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
135 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
136 | if (status->flag & RX_FLAG_SHORTPRE) |
137 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
138 | pos++; |
139 | ||
140 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
141 | if (status->flag & RX_FLAG_HT) { |
142 | /* | |
143 | * TODO: add following information into radiotap header once | |
144 | * suitable fields are defined for it: | |
145 | * - MCS index (status->rate_idx) | |
146 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
147 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
148 | */ | |
149 | *pos = 0; | |
8d6f658e | 150 | } else { |
ebe6c7ba | 151 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 152 | *pos = rate->bitrate / 5; |
8d6f658e | 153 | } |
601ae7f2 BR |
154 | pos++; |
155 | ||
156 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 157 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
158 | pos += 2; |
159 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
160 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
161 | pos); | |
5f0b7de5 JB |
162 | else if (status->flag & RX_FLAG_HT) |
163 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
164 | pos); | |
9deb1ae5 | 165 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
166 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
167 | pos); | |
601ae7f2 | 168 | else |
6a86b9c7 JB |
169 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
170 | pos); | |
601ae7f2 BR |
171 | pos += 2; |
172 | ||
173 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
174 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
175 | *pos = status->signal; | |
176 | rthdr->it_present |= | |
177 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
178 | pos++; | |
179 | } | |
180 | ||
601ae7f2 BR |
181 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
182 | ||
183 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
184 | *pos = status->antenna; | |
185 | pos++; | |
186 | ||
601ae7f2 BR |
187 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
188 | ||
189 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
190 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 191 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 192 | pos++; |
aae89831 | 193 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
194 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
195 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
196 | pos += 2; |
197 | } | |
198 | ||
b2e7771e JB |
199 | /* |
200 | * This function copies a received frame to all monitor interfaces and | |
201 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
202 | * radiotap header the driver might have added. | |
203 | */ | |
204 | static struct sk_buff * | |
205 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 206 | struct ieee80211_rate *rate) |
b2e7771e | 207 | { |
f1d58c25 | 208 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 209 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 210 | int needed_headroom = 0; |
b2e7771e JB |
211 | struct sk_buff *skb, *skb2; |
212 | struct net_device *prev_dev = NULL; | |
213 | int present_fcs_len = 0; | |
b2e7771e JB |
214 | |
215 | /* | |
216 | * First, we may need to make a copy of the skb because | |
217 | * (1) we need to modify it for radiotap (if not present), and | |
218 | * (2) the other RX handlers will modify the skb we got. | |
219 | * | |
220 | * We don't need to, of course, if we aren't going to return | |
221 | * the SKB because it has a bad FCS/PLCP checksum. | |
222 | */ | |
0869aea0 JB |
223 | |
224 | /* room for the radiotap header based on driver features */ | |
225 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
226 | |
227 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
228 | present_fcs_len = FCS_LEN; | |
229 | ||
230 | if (!local->monitors) { | |
0869aea0 | 231 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
232 | dev_kfree_skb(origskb); |
233 | return NULL; | |
234 | } | |
235 | ||
0869aea0 | 236 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
237 | } |
238 | ||
0869aea0 | 239 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
240 | /* only need to expand headroom if necessary */ |
241 | skb = origskb; | |
242 | origskb = NULL; | |
243 | ||
244 | /* | |
245 | * This shouldn't trigger often because most devices have an | |
246 | * RX header they pull before we get here, and that should | |
247 | * be big enough for our radiotap information. We should | |
248 | * probably export the length to drivers so that we can have | |
249 | * them allocate enough headroom to start with. | |
250 | */ | |
251 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 252 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
253 | dev_kfree_skb(skb); |
254 | return NULL; | |
255 | } | |
256 | } else { | |
257 | /* | |
258 | * Need to make a copy and possibly remove radiotap header | |
259 | * and FCS from the original. | |
260 | */ | |
261 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
262 | ||
0869aea0 | 263 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
264 | |
265 | if (!skb) | |
266 | return origskb; | |
267 | } | |
268 | ||
0869aea0 JB |
269 | /* prepend radiotap information */ |
270 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 271 | |
ce3edf6d | 272 | skb_reset_mac_header(skb); |
b2e7771e JB |
273 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
274 | skb->pkt_type = PACKET_OTHERHOST; | |
275 | skb->protocol = htons(ETH_P_802_2); | |
276 | ||
277 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 278 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
279 | continue; |
280 | ||
3d30d949 MW |
281 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
282 | continue; | |
283 | ||
9607e6b6 | 284 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
285 | continue; |
286 | ||
b2e7771e JB |
287 | if (prev_dev) { |
288 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
289 | if (skb2) { | |
290 | skb2->dev = prev_dev; | |
291 | netif_rx(skb2); | |
292 | } | |
293 | } | |
294 | ||
295 | prev_dev = sdata->dev; | |
296 | sdata->dev->stats.rx_packets++; | |
297 | sdata->dev->stats.rx_bytes += skb->len; | |
298 | } | |
299 | ||
300 | if (prev_dev) { | |
301 | skb->dev = prev_dev; | |
302 | netif_rx(skb); | |
303 | } else | |
304 | dev_kfree_skb(skb); | |
305 | ||
306 | return origskb; | |
307 | } | |
308 | ||
309 | ||
5cf121c3 | 310 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 311 | { |
238f74a2 | 312 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
313 | int tid; |
314 | ||
315 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
316 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
317 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 318 | /* frame has qos control */ |
238f74a2 HH |
319 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
320 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 321 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 322 | else |
5cf121c3 | 323 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 324 | } else { |
1411f9b5 JB |
325 | /* |
326 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
327 | * | |
328 | * Sequence numbers for management frames, QoS data | |
329 | * frames with a broadcast/multicast address in the | |
330 | * Address 1 field, and all non-QoS data frames sent | |
331 | * by QoS STAs are assigned using an additional single | |
332 | * modulo-4096 counter, [...] | |
333 | * | |
334 | * We also use that counter for non-QoS STAs. | |
335 | */ | |
336 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 337 | } |
52865dfd | 338 | |
5cf121c3 | 339 | rx->queue = tid; |
6e0d114d JB |
340 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
341 | * For now, set skb->priority to 0 for other cases. */ | |
342 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 343 | } |
6e0d114d | 344 | |
d1c3a37c JB |
345 | /** |
346 | * DOC: Packet alignment | |
347 | * | |
348 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
349 | * to the stack. | |
350 | * | |
351 | * Additionally, should, if possible, align the payload data in a way that | |
352 | * guarantees that the contained IP header is aligned to a four-byte | |
353 | * boundary. In the case of regular frames, this simply means aligning the | |
354 | * payload to a four-byte boundary (because either the IP header is directly | |
355 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
356 | * in front of it). If the payload data is not properly aligned and the |
357 | * architecture doesn't support efficient unaligned operations, mac80211 | |
358 | * will align the data. | |
d1c3a37c JB |
359 | * |
360 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
361 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
362 | * push the IP header further back to a multiple of four again. Thankfully, the | |
363 | * specs were sane enough this time around to require padding each A-MSDU | |
364 | * subframe to a length that is a multiple of four. | |
365 | * | |
366 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
367 | * the payload is not supported, the driver is required to move the 802.11 | |
368 | * header to be directly in front of the payload in that case. | |
369 | */ | |
370 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 371 | { |
59d9cb07 KV |
372 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
373 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
374 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 375 | #endif |
6e0d114d JB |
376 | } |
377 | ||
6368e4b1 | 378 | |
571ecf67 JB |
379 | /* rx handlers */ |
380 | ||
49461622 | 381 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 382 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
383 | { |
384 | struct ieee80211_local *local = rx->local; | |
385 | struct sk_buff *skb = rx->skb; | |
386 | ||
fbe9c429 | 387 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 388 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 389 | |
142b9f50 HS |
390 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
391 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 392 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 393 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 394 | dev_kfree_skb(skb); |
9ae54c84 | 395 | return RX_QUEUED; |
571ecf67 JB |
396 | } |
397 | ||
5cf121c3 | 398 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
399 | /* scanning finished during invoking of handlers */ |
400 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 401 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
402 | } |
403 | ||
9ae54c84 | 404 | return RX_CONTINUE; |
571ecf67 JB |
405 | } |
406 | ||
3cfcf6ac JM |
407 | |
408 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
409 | { | |
410 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
411 | ||
412 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
413 | return 0; | |
414 | ||
415 | return ieee80211_is_robust_mgmt_frame(hdr); | |
416 | } | |
417 | ||
418 | ||
419 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
420 | { | |
421 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
422 | ||
423 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
424 | return 0; | |
425 | ||
426 | return ieee80211_is_robust_mgmt_frame(hdr); | |
427 | } | |
428 | ||
429 | ||
430 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
431 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
432 | { | |
433 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
434 | struct ieee80211_mmie *mmie; | |
435 | ||
436 | if (skb->len < 24 + sizeof(*mmie) || | |
437 | !is_multicast_ether_addr(hdr->da)) | |
438 | return -1; | |
439 | ||
440 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
441 | return -1; /* not a robust management frame */ | |
442 | ||
443 | mmie = (struct ieee80211_mmie *) | |
444 | (skb->data + skb->len - sizeof(*mmie)); | |
445 | if (mmie->element_id != WLAN_EID_MMIE || | |
446 | mmie->length != sizeof(*mmie) - 2) | |
447 | return -1; | |
448 | ||
449 | return le16_to_cpu(mmie->key_id); | |
450 | } | |
451 | ||
452 | ||
33b64eb2 | 453 | static ieee80211_rx_result |
5cf121c3 | 454 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 455 | { |
a7767f95 HH |
456 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
457 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 458 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 459 | |
a7767f95 | 460 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
461 | if (is_multicast_ether_addr(hdr->addr1)) { |
462 | if (ieee80211_has_tods(hdr->frame_control) || | |
463 | !ieee80211_has_fromds(hdr->frame_control)) | |
464 | return RX_DROP_MONITOR; | |
465 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
466 | return RX_DROP_MONITOR; | |
467 | } else { | |
468 | if (!ieee80211_has_a4(hdr->frame_control)) | |
469 | return RX_DROP_MONITOR; | |
470 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
471 | return RX_DROP_MONITOR; | |
472 | } | |
33b64eb2 LCC |
473 | } |
474 | ||
475 | /* If there is not an established peer link and this is not a peer link | |
476 | * establisment frame, beacon or probe, drop the frame. | |
477 | */ | |
478 | ||
b4e08ea1 | 479 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 480 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 481 | |
a7767f95 | 482 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
483 | return RX_DROP_MONITOR; |
484 | ||
a7767f95 | 485 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 486 | mgmt = (struct ieee80211_mgmt *)hdr; |
0938393f | 487 | if (mgmt->u.action.category != MESH_PLINK_CATEGORY) |
33b64eb2 | 488 | return RX_DROP_MONITOR; |
33b64eb2 | 489 | return RX_CONTINUE; |
33b64eb2 LCC |
490 | } |
491 | ||
a7767f95 HH |
492 | if (ieee80211_is_probe_req(hdr->frame_control) || |
493 | ieee80211_is_probe_resp(hdr->frame_control) || | |
494 | ieee80211_is_beacon(hdr->frame_control)) | |
495 | return RX_CONTINUE; | |
496 | ||
497 | return RX_DROP_MONITOR; | |
498 | ||
499 | } | |
500 | ||
501 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
502 | ||
503 | if (ieee80211_is_data(hdr->frame_control) && | |
504 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 505 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 506 | return RX_DROP_MONITOR; |
902acc78 | 507 | #undef msh_h_get |
d6d1a5a7 | 508 | |
902acc78 JB |
509 | return RX_CONTINUE; |
510 | } | |
33b64eb2 | 511 | |
1edfb1af JB |
512 | #define SEQ_MODULO 0x1000 |
513 | #define SEQ_MASK 0xfff | |
514 | ||
515 | static inline int seq_less(u16 sq1, u16 sq2) | |
516 | { | |
517 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
518 | } | |
519 | ||
520 | static inline u16 seq_inc(u16 sq) | |
521 | { | |
522 | return (sq + 1) & SEQ_MASK; | |
523 | } | |
524 | ||
525 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
526 | { | |
527 | return (sq1 - sq2) & SEQ_MASK; | |
528 | } | |
529 | ||
530 | ||
531 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
532 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
533 | int index, |
534 | struct sk_buff_head *frames) | |
1edfb1af JB |
535 | { |
536 | struct ieee80211_supported_band *sband; | |
537 | struct ieee80211_rate *rate = NULL; | |
538 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; | |
539 | struct ieee80211_rx_status *status; | |
540 | ||
541 | if (!skb) | |
542 | goto no_frame; | |
543 | ||
544 | status = IEEE80211_SKB_RXCB(skb); | |
545 | ||
546 | /* release the reordered frames to stack */ | |
547 | sband = hw->wiphy->bands[status->band]; | |
548 | if (!(status->flag & RX_FLAG_HT)) | |
549 | rate = &sband->bitrates[status->rate_idx]; | |
1edfb1af JB |
550 | tid_agg_rx->stored_mpdu_num--; |
551 | tid_agg_rx->reorder_buf[index] = NULL; | |
d29cecda | 552 | __skb_queue_tail(frames, skb); |
1edfb1af JB |
553 | |
554 | no_frame: | |
555 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
556 | } | |
557 | ||
558 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
559 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
560 | u16 head_seq_num, |
561 | struct sk_buff_head *frames) | |
1edfb1af JB |
562 | { |
563 | int index; | |
564 | ||
565 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
566 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
567 | tid_agg_rx->buf_size; | |
2569a826 | 568 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
569 | } |
570 | } | |
571 | ||
572 | /* | |
573 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
574 | * the skb was added to the buffer longer than this time ago, the earlier | |
575 | * frames that have not yet been received are assumed to be lost and the skb | |
576 | * can be released for processing. This may also release other skb's from the | |
577 | * reorder buffer if there are no additional gaps between the frames. | |
578 | */ | |
579 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
580 | ||
581 | /* | |
582 | * As this function belongs to the RX path it must be under | |
583 | * rcu_read_lock protection. It returns false if the frame | |
584 | * can be processed immediately, true if it was consumed. | |
585 | */ | |
586 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
587 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
588 | struct sk_buff *skb, |
589 | struct sk_buff_head *frames) | |
1edfb1af JB |
590 | { |
591 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
592 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
593 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
594 | u16 head_seq_num, buf_size; | |
595 | int index; | |
596 | ||
597 | buf_size = tid_agg_rx->buf_size; | |
598 | head_seq_num = tid_agg_rx->head_seq_num; | |
599 | ||
600 | /* frame with out of date sequence number */ | |
601 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
602 | dev_kfree_skb(skb); | |
603 | return true; | |
604 | } | |
605 | ||
606 | /* | |
607 | * If frame the sequence number exceeds our buffering window | |
608 | * size release some previous frames to make room for this one. | |
609 | */ | |
610 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
611 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
612 | /* release stored frames up to new head to stack */ | |
2569a826 JB |
613 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
614 | frames); | |
1edfb1af JB |
615 | } |
616 | ||
617 | /* Now the new frame is always in the range of the reordering buffer */ | |
618 | ||
619 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
620 | ||
621 | /* check if we already stored this frame */ | |
622 | if (tid_agg_rx->reorder_buf[index]) { | |
623 | dev_kfree_skb(skb); | |
624 | return true; | |
625 | } | |
626 | ||
627 | /* | |
628 | * If the current MPDU is in the right order and nothing else | |
629 | * is stored we can process it directly, no need to buffer it. | |
630 | */ | |
631 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
632 | tid_agg_rx->stored_mpdu_num == 0) { | |
633 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
634 | return false; | |
635 | } | |
636 | ||
637 | /* put the frame in the reordering buffer */ | |
638 | tid_agg_rx->reorder_buf[index] = skb; | |
639 | tid_agg_rx->reorder_time[index] = jiffies; | |
640 | tid_agg_rx->stored_mpdu_num++; | |
641 | /* release the buffer until next missing frame */ | |
642 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
643 | tid_agg_rx->buf_size; | |
644 | if (!tid_agg_rx->reorder_buf[index] && | |
645 | tid_agg_rx->stored_mpdu_num > 1) { | |
646 | /* | |
647 | * No buffers ready to be released, but check whether any | |
648 | * frames in the reorder buffer have timed out. | |
649 | */ | |
650 | int j; | |
651 | int skipped = 1; | |
652 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
653 | j = (j + 1) % tid_agg_rx->buf_size) { | |
654 | if (!tid_agg_rx->reorder_buf[j]) { | |
655 | skipped++; | |
656 | continue; | |
657 | } | |
658 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
659 | HT_RX_REORDER_BUF_TIMEOUT)) | |
660 | break; | |
661 | ||
662 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
663 | if (net_ratelimit()) | |
664 | printk(KERN_DEBUG "%s: release an RX reorder " | |
665 | "frame due to timeout on earlier " | |
666 | "frames\n", | |
667 | wiphy_name(hw->wiphy)); | |
668 | #endif | |
2569a826 JB |
669 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
670 | j, frames); | |
1edfb1af JB |
671 | |
672 | /* | |
673 | * Increment the head seq# also for the skipped slots. | |
674 | */ | |
675 | tid_agg_rx->head_seq_num = | |
676 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
677 | skipped = 0; | |
678 | } | |
679 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2569a826 | 680 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
681 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
682 | tid_agg_rx->buf_size; | |
683 | } | |
684 | ||
685 | return true; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
690 | * true if the MPDU was buffered, false if it should be processed. | |
691 | */ | |
2569a826 JB |
692 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
693 | struct sk_buff_head *frames) | |
1edfb1af | 694 | { |
2569a826 JB |
695 | struct sk_buff *skb = rx->skb; |
696 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
697 | struct ieee80211_hw *hw = &local->hw; |
698 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 699 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
700 | struct tid_ampdu_rx *tid_agg_rx; |
701 | u16 sc; | |
702 | int tid; | |
703 | ||
704 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 705 | goto dont_reorder; |
1edfb1af JB |
706 | |
707 | /* | |
708 | * filter the QoS data rx stream according to | |
709 | * STA/TID and check if this STA/TID is on aggregation | |
710 | */ | |
711 | ||
1edfb1af | 712 | if (!sta) |
2569a826 | 713 | goto dont_reorder; |
1edfb1af JB |
714 | |
715 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
716 | ||
717 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) | |
2569a826 | 718 | goto dont_reorder; |
1edfb1af JB |
719 | |
720 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
721 | ||
722 | /* qos null data frames are excluded */ | |
723 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
2569a826 | 724 | goto dont_reorder; |
1edfb1af JB |
725 | |
726 | /* new, potentially un-ordered, ampdu frame - process it */ | |
727 | ||
728 | /* reset session timer */ | |
729 | if (tid_agg_rx->timeout) | |
730 | mod_timer(&tid_agg_rx->session_timer, | |
731 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
732 | ||
733 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
734 | sc = le16_to_cpu(hdr->seq_ctrl); | |
735 | if (sc & IEEE80211_SCTL_FRAG) { | |
736 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
737 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); | |
738 | dev_kfree_skb(skb); | |
2569a826 | 739 | return; |
1edfb1af JB |
740 | } |
741 | ||
2569a826 JB |
742 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) |
743 | return; | |
744 | ||
745 | dont_reorder: | |
746 | __skb_queue_tail(frames, skb); | |
1edfb1af | 747 | } |
33b64eb2 | 748 | |
49461622 | 749 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 750 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 751 | { |
a7767f95 | 752 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
753 | |
754 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
755 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 756 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 757 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 758 | hdr->seq_ctrl)) { |
5cf121c3 | 759 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
760 | rx->local->dot11FrameDuplicateCount++; |
761 | rx->sta->num_duplicates++; | |
762 | } | |
e4c26add | 763 | return RX_DROP_MONITOR; |
571ecf67 | 764 | } else |
5cf121c3 | 765 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
766 | } |
767 | ||
571ecf67 JB |
768 | if (unlikely(rx->skb->len < 16)) { |
769 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 770 | return RX_DROP_MONITOR; |
571ecf67 JB |
771 | } |
772 | ||
571ecf67 JB |
773 | /* Drop disallowed frame classes based on STA auth/assoc state; |
774 | * IEEE 802.11, Chap 5.5. | |
775 | * | |
ccd7b362 JB |
776 | * mac80211 filters only based on association state, i.e. it drops |
777 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
778 | * deauth/disassoc frames when needed. In addition, hostapd is |
779 | * responsible for filtering on both auth and assoc states. | |
780 | */ | |
33b64eb2 | 781 | |
902acc78 | 782 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 783 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 784 | |
a7767f95 HH |
785 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
786 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 787 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 788 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
789 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
790 | !ieee80211_has_tods(hdr->frame_control) && | |
791 | ieee80211_is_data(hdr->frame_control)) || | |
792 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
793 | /* Drop IBSS frames and frames for other hosts |
794 | * silently. */ | |
e4c26add | 795 | return RX_DROP_MONITOR; |
571ecf67 JB |
796 | } |
797 | ||
e4c26add | 798 | return RX_DROP_MONITOR; |
571ecf67 JB |
799 | } |
800 | ||
9ae54c84 | 801 | return RX_CONTINUE; |
570bd537 JB |
802 | } |
803 | ||
804 | ||
49461622 | 805 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 806 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 807 | { |
eb9fb5b8 JB |
808 | struct sk_buff *skb = rx->skb; |
809 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
810 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
811 | int keyidx; |
812 | int hdrlen; | |
e4c26add | 813 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 814 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 815 | int mmie_keyidx = -1; |
570bd537 | 816 | |
3017b80b JB |
817 | /* |
818 | * Key selection 101 | |
819 | * | |
3cfcf6ac | 820 | * There are four types of keys: |
3017b80b | 821 | * - GTK (group keys) |
3cfcf6ac | 822 | * - IGTK (group keys for management frames) |
3017b80b JB |
823 | * - PTK (pairwise keys) |
824 | * - STK (station-to-station pairwise keys) | |
825 | * | |
826 | * When selecting a key, we have to distinguish between multicast | |
827 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
828 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
829 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
830 | * unicast frames can also use key indices like GTKs. Hence, if we | |
831 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 832 | * |
8dc06a1c JB |
833 | * Note that in a regular BSS, multicast frames are sent by the |
834 | * AP only, associated stations unicast the frame to the AP first | |
835 | * which then multicasts it on their behalf. | |
836 | * | |
3017b80b JB |
837 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
838 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
839 | * The spec seems to expect that one negotiates the same key with |
840 | * every station but there's no such requirement; VLANs could be | |
841 | * possible. | |
3017b80b JB |
842 | */ |
843 | ||
3017b80b | 844 | /* |
1990af8d | 845 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
846 | * addressed to us nor a multicast frame. |
847 | */ | |
5cf121c3 | 848 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 849 | return RX_CONTINUE; |
3017b80b | 850 | |
2569a826 JB |
851 | /* start without a key */ |
852 | rx->key = NULL; | |
853 | ||
d4e46a3d JB |
854 | if (rx->sta) |
855 | stakey = rcu_dereference(rx->sta->key); | |
856 | ||
0c7c10c7 JM |
857 | if (!ieee80211_has_protected(hdr->frame_control)) |
858 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
859 | ||
d4e46a3d JB |
860 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
861 | rx->key = stakey; | |
0c7c10c7 JM |
862 | /* Skip decryption if the frame is not protected. */ |
863 | if (!ieee80211_has_protected(hdr->frame_control)) | |
864 | return RX_CONTINUE; | |
3cfcf6ac JM |
865 | } else if (mmie_keyidx >= 0) { |
866 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
867 | if ((status->flag & RX_FLAG_DECRYPTED) && |
868 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
869 | return RX_CONTINUE; |
870 | ||
871 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
872 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
873 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
874 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
875 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
876 | /* | |
877 | * The frame was not protected, so skip decryption. However, we | |
878 | * need to set rx->key if there is a key that could have been | |
879 | * used so that the frame may be dropped if encryption would | |
880 | * have been expected. | |
881 | */ | |
882 | struct ieee80211_key *key = NULL; | |
883 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
884 | is_multicast_ether_addr(hdr->addr1) && | |
885 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
886 | rx->key = key; | |
887 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
888 | rx->key = key; | |
889 | return RX_CONTINUE; | |
571ecf67 | 890 | } else { |
3017b80b JB |
891 | /* |
892 | * The device doesn't give us the IV so we won't be | |
893 | * able to look up the key. That's ok though, we | |
894 | * don't need to decrypt the frame, we just won't | |
895 | * be able to keep statistics accurate. | |
896 | * Except for key threshold notifications, should | |
897 | * we somehow allow the driver to tell us which key | |
898 | * the hardware used if this flag is set? | |
899 | */ | |
eb9fb5b8 JB |
900 | if ((status->flag & RX_FLAG_DECRYPTED) && |
901 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 902 | return RX_CONTINUE; |
3017b80b | 903 | |
a7767f95 | 904 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
905 | |
906 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 907 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
908 | |
909 | /* | |
910 | * no need to call ieee80211_wep_get_keyidx, | |
911 | * it verifies a bunch of things we've done already | |
912 | */ | |
913 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
914 | ||
d4e46a3d | 915 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
916 | |
917 | /* | |
918 | * RSNA-protected unicast frames should always be sent with | |
919 | * pairwise or station-to-station keys, but for WEP we allow | |
920 | * using a key index as well. | |
921 | */ | |
8f20fc24 | 922 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
923 | !is_multicast_ether_addr(hdr->addr1)) |
924 | rx->key = NULL; | |
571ecf67 JB |
925 | } |
926 | ||
3017b80b | 927 | if (rx->key) { |
571ecf67 | 928 | rx->key->tx_rx_count++; |
011bfcc4 | 929 | /* TODO: add threshold stuff again */ |
1990af8d | 930 | } else { |
e4c26add | 931 | return RX_DROP_MONITOR; |
70f08765 JB |
932 | } |
933 | ||
1990af8d JB |
934 | /* Check for weak IVs if possible */ |
935 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 936 | ieee80211_is_data(hdr->frame_control) && |
eb9fb5b8 JB |
937 | (!(status->flag & RX_FLAG_IV_STRIPPED) || |
938 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
939 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
940 | rx->sta->wep_weak_iv_count++; | |
941 | ||
70f08765 JB |
942 | switch (rx->key->conf.alg) { |
943 | case ALG_WEP: | |
e2f036da MN |
944 | result = ieee80211_crypto_wep_decrypt(rx); |
945 | break; | |
70f08765 | 946 | case ALG_TKIP: |
e2f036da MN |
947 | result = ieee80211_crypto_tkip_decrypt(rx); |
948 | break; | |
70f08765 | 949 | case ALG_CCMP: |
e2f036da MN |
950 | result = ieee80211_crypto_ccmp_decrypt(rx); |
951 | break; | |
3cfcf6ac JM |
952 | case ALG_AES_CMAC: |
953 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
954 | break; | |
70f08765 JB |
955 | } |
956 | ||
e2f036da | 957 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 958 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
959 | |
960 | return result; | |
70f08765 JB |
961 | } |
962 | ||
572e0012 KV |
963 | static ieee80211_rx_result debug_noinline |
964 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
965 | { | |
966 | struct ieee80211_local *local; | |
967 | struct ieee80211_hdr *hdr; | |
968 | struct sk_buff *skb; | |
969 | ||
970 | local = rx->local; | |
971 | skb = rx->skb; | |
972 | hdr = (struct ieee80211_hdr *) skb->data; | |
973 | ||
974 | if (!local->pspolling) | |
975 | return RX_CONTINUE; | |
976 | ||
977 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
978 | /* this is not from AP */ | |
979 | return RX_CONTINUE; | |
980 | ||
981 | if (!ieee80211_is_data(hdr->frame_control)) | |
982 | return RX_CONTINUE; | |
983 | ||
984 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
985 | /* AP has no more frames buffered for us */ | |
986 | local->pspolling = false; | |
987 | return RX_CONTINUE; | |
988 | } | |
989 | ||
990 | /* more data bit is set, let's request a new frame from the AP */ | |
991 | ieee80211_send_pspoll(local, rx->sdata); | |
992 | ||
993 | return RX_CONTINUE; | |
994 | } | |
995 | ||
133b8226 | 996 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 997 | { |
133b8226 | 998 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 999 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1000 | |
3e122be0 | 1001 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1002 | set_sta_flags(sta, WLAN_STA_PS_STA); |
12375ef9 | 1003 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1004 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1005 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1006 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1007 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1008 | } | |
1009 | ||
ff9458d3 | 1010 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1011 | { |
133b8226 | 1012 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1013 | |
3e122be0 | 1014 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1015 | |
af818581 | 1016 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
004c872e | 1017 | |
571ecf67 | 1018 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1019 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1020 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1021 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1022 | |
af818581 | 1023 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1024 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1025 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1026 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1027 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1028 | return; |
1029 | } | |
1030 | ||
1031 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1032 | } |
1033 | ||
49461622 | 1034 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1035 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1036 | { |
1037 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1038 | struct sk_buff *skb = rx->skb; |
1039 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1040 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1041 | |
1042 | if (!sta) | |
9ae54c84 | 1043 | return RX_CONTINUE; |
571ecf67 | 1044 | |
b291ba11 JB |
1045 | /* |
1046 | * Update last_rx only for IBSS packets which are for the current | |
1047 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1048 | * where other STAs start using different BSSID. | |
1049 | */ | |
05c914fe | 1050 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1051 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1052 | NL80211_IFTYPE_ADHOC); |
46900298 | 1053 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1054 | sta->last_rx = jiffies; |
b291ba11 JB |
1055 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1056 | /* | |
33b64eb2 LCC |
1057 | * Mesh beacons will update last_rx when if they are found to |
1058 | * match the current local configuration when processed. | |
571ecf67 | 1059 | */ |
b291ba11 | 1060 | sta->last_rx = jiffies; |
571ecf67 JB |
1061 | } |
1062 | ||
5cf121c3 | 1063 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1064 | return RX_CONTINUE; |
571ecf67 | 1065 | |
3cf335d5 KV |
1066 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1067 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1068 | ||
571ecf67 JB |
1069 | sta->rx_fragments++; |
1070 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1071 | sta->last_signal = status->signal; |
571ecf67 | 1072 | |
72eaa43a JB |
1073 | /* |
1074 | * Change STA power saving mode only at the end of a frame | |
1075 | * exchange sequence. | |
1076 | */ | |
3e122be0 | 1077 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
1078 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1079 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1080 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1081 | /* |
1082 | * Ignore doze->wake transitions that are | |
1083 | * indicated by non-data frames, the standard | |
1084 | * is unclear here, but for example going to | |
1085 | * PS mode and then scanning would cause a | |
1086 | * doze->wake transition for the probe request, | |
1087 | * and that is clearly undesirable. | |
1088 | */ | |
1089 | if (ieee80211_is_data(hdr->frame_control) && | |
1090 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1091 | ap_sta_ps_end(sta); |
72eaa43a JB |
1092 | } else { |
1093 | if (ieee80211_has_pm(hdr->frame_control)) | |
1094 | ap_sta_ps_start(sta); | |
1095 | } | |
571ecf67 JB |
1096 | } |
1097 | ||
22403def JB |
1098 | /* |
1099 | * Drop (qos-)data::nullfunc frames silently, since they | |
1100 | * are used only to control station power saving mode. | |
1101 | */ | |
1102 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1103 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1104 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1105 | |
1106 | /* | |
1107 | * If we receive a 4-addr nullfunc frame from a STA | |
1108 | * that was not moved to a 4-addr STA vlan yet, drop | |
1109 | * the frame to the monitor interface, to make sure | |
1110 | * that hostapd sees it | |
1111 | */ | |
1112 | if (ieee80211_has_a4(hdr->frame_control) && | |
1113 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1114 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1115 | !rx->sdata->u.vlan.sta))) | |
1116 | return RX_DROP_MONITOR; | |
22403def JB |
1117 | /* |
1118 | * Update counter and free packet here to avoid | |
1119 | * counting this as a dropped packed. | |
1120 | */ | |
571ecf67 JB |
1121 | sta->rx_packets++; |
1122 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1123 | return RX_QUEUED; |
571ecf67 JB |
1124 | } |
1125 | ||
9ae54c84 | 1126 | return RX_CONTINUE; |
571ecf67 JB |
1127 | } /* ieee80211_rx_h_sta_process */ |
1128 | ||
571ecf67 JB |
1129 | static inline struct ieee80211_fragment_entry * |
1130 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1131 | unsigned int frag, unsigned int seq, int rx_queue, | |
1132 | struct sk_buff **skb) | |
1133 | { | |
1134 | struct ieee80211_fragment_entry *entry; | |
1135 | int idx; | |
1136 | ||
1137 | idx = sdata->fragment_next; | |
1138 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1139 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1140 | sdata->fragment_next = 0; | |
1141 | ||
1142 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1143 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1144 | struct ieee80211_hdr *hdr = |
1145 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1146 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1147 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1148 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1149 | sdata->name, idx, |
571ecf67 | 1150 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1151 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1152 | #endif |
571ecf67 JB |
1153 | __skb_queue_purge(&entry->skb_list); |
1154 | } | |
1155 | ||
1156 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1157 | *skb = NULL; | |
1158 | entry->first_frag_time = jiffies; | |
1159 | entry->seq = seq; | |
1160 | entry->rx_queue = rx_queue; | |
1161 | entry->last_frag = frag; | |
1162 | entry->ccmp = 0; | |
1163 | entry->extra_len = 0; | |
1164 | ||
1165 | return entry; | |
1166 | } | |
1167 | ||
1168 | static inline struct ieee80211_fragment_entry * | |
1169 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1170 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1171 | int rx_queue, struct ieee80211_hdr *hdr) |
1172 | { | |
1173 | struct ieee80211_fragment_entry *entry; | |
1174 | int i, idx; | |
1175 | ||
1176 | idx = sdata->fragment_next; | |
1177 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1178 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1179 | |
1180 | idx--; | |
1181 | if (idx < 0) | |
1182 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1183 | ||
1184 | entry = &sdata->fragments[idx]; | |
1185 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1186 | entry->rx_queue != rx_queue || | |
1187 | entry->last_frag + 1 != frag) | |
1188 | continue; | |
1189 | ||
b73d70ad | 1190 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1191 | |
b73d70ad HH |
1192 | /* |
1193 | * Check ftype and addresses are equal, else check next fragment | |
1194 | */ | |
1195 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1196 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1197 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1198 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1199 | continue; | |
1200 | ||
ab46623e | 1201 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1202 | __skb_queue_purge(&entry->skb_list); |
1203 | continue; | |
1204 | } | |
1205 | return entry; | |
1206 | } | |
1207 | ||
1208 | return NULL; | |
1209 | } | |
1210 | ||
49461622 | 1211 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1212 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1213 | { |
1214 | struct ieee80211_hdr *hdr; | |
1215 | u16 sc; | |
358c8d9d | 1216 | __le16 fc; |
571ecf67 JB |
1217 | unsigned int frag, seq; |
1218 | struct ieee80211_fragment_entry *entry; | |
1219 | struct sk_buff *skb; | |
1220 | ||
b73d70ad | 1221 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1222 | fc = hdr->frame_control; |
571ecf67 JB |
1223 | sc = le16_to_cpu(hdr->seq_ctrl); |
1224 | frag = sc & IEEE80211_SCTL_FRAG; | |
1225 | ||
358c8d9d | 1226 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1227 | (rx->skb)->len < 24 || |
1228 | is_multicast_ether_addr(hdr->addr1))) { | |
1229 | /* not fragmented */ | |
1230 | goto out; | |
1231 | } | |
1232 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1233 | ||
1234 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1235 | ||
1236 | if (frag == 0) { | |
1237 | /* This is the first fragment of a new frame. */ | |
1238 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1239 | rx->queue, &(rx->skb)); |
8f20fc24 | 1240 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1241 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1242 | /* Store CCMP PN so that we can verify that the next |
1243 | * fragment has a sequential PN value. */ | |
1244 | entry->ccmp = 1; | |
1245 | memcpy(entry->last_pn, | |
5cf121c3 | 1246 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1247 | CCMP_PN_LEN); |
1248 | } | |
9ae54c84 | 1249 | return RX_QUEUED; |
571ecf67 JB |
1250 | } |
1251 | ||
1252 | /* This is a fragment for a frame that should already be pending in | |
1253 | * fragment cache. Add this fragment to the end of the pending entry. | |
1254 | */ | |
b73d70ad | 1255 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1256 | if (!entry) { |
1257 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1258 | return RX_DROP_MONITOR; |
571ecf67 JB |
1259 | } |
1260 | ||
1261 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1262 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1263 | if (entry->ccmp) { | |
1264 | int i; | |
1265 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1266 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1267 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1268 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1269 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1270 | pn[i]++; | |
1271 | if (pn[i]) | |
1272 | break; | |
1273 | } | |
5cf121c3 | 1274 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1275 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1276 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1277 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1278 | } | |
1279 | ||
358c8d9d | 1280 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1281 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1282 | entry->last_frag = frag; | |
1283 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1284 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1285 | rx->skb = NULL; |
9ae54c84 | 1286 | return RX_QUEUED; |
571ecf67 JB |
1287 | } |
1288 | ||
1289 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1290 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1291 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1292 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1293 | GFP_ATOMIC))) { | |
1294 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1295 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1296 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1297 | } |
1298 | } | |
1299 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1300 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1301 | dev_kfree_skb(skb); | |
1302 | } | |
1303 | ||
1304 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1305 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1306 | |
1307 | out: | |
1308 | if (rx->sta) | |
1309 | rx->sta->rx_packets++; | |
1310 | if (is_multicast_ether_addr(hdr->addr1)) | |
1311 | rx->local->dot11MulticastReceivedFrameCount++; | |
1312 | else | |
1313 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1314 | return RX_CONTINUE; |
571ecf67 JB |
1315 | } |
1316 | ||
49461622 | 1317 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1318 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1319 | { |
af818581 | 1320 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1321 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1322 | |
358c8d9d | 1323 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1324 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1325 | return RX_CONTINUE; |
571ecf67 | 1326 | |
05c914fe JB |
1327 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1328 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1329 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1330 | |
af818581 JB |
1331 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1332 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1333 | else | |
1334 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1335 | |
9ae54c84 | 1336 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1337 | * count as an dropped frame. */ |
1338 | dev_kfree_skb(rx->skb); | |
1339 | ||
9ae54c84 | 1340 | return RX_QUEUED; |
571ecf67 JB |
1341 | } |
1342 | ||
49461622 | 1343 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1344 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1345 | { |
6e0d114d | 1346 | u8 *data = rx->skb->data; |
238f74a2 | 1347 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1348 | |
238f74a2 | 1349 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1350 | return RX_CONTINUE; |
6e0d114d JB |
1351 | |
1352 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1353 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1354 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1355 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1356 | /* change frame type to non QOS */ |
238f74a2 | 1357 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1358 | |
9ae54c84 | 1359 | return RX_CONTINUE; |
6e0d114d JB |
1360 | } |
1361 | ||
76ee65bf | 1362 | static int |
5cf121c3 | 1363 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1364 | { |
07346f81 | 1365 | if (unlikely(!rx->sta || |
f4ea83dd | 1366 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1367 | return -EACCES; |
571ecf67 | 1368 | |
76ee65bf | 1369 | return 0; |
571ecf67 JB |
1370 | } |
1371 | ||
76ee65bf | 1372 | static int |
358c8d9d | 1373 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1374 | { |
eb9fb5b8 JB |
1375 | struct sk_buff *skb = rx->skb; |
1376 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1377 | ||
3017b80b | 1378 | /* |
7848ba7d JB |
1379 | * Pass through unencrypted frames if the hardware has |
1380 | * decrypted them already. | |
3017b80b | 1381 | */ |
eb9fb5b8 | 1382 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1383 | return 0; |
571ecf67 JB |
1384 | |
1385 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1386 | if (unlikely(!ieee80211_has_protected(fc) && |
1387 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1388 | ieee80211_is_data(fc) && |
b3fc9c6c | 1389 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1390 | return -EACCES; |
bef5d1c7 JB |
1391 | |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | static int | |
1396 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1397 | { | |
1398 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
1399 | __le16 fc = hdr->frame_control; | |
1400 | int res; | |
1401 | ||
1402 | res = ieee80211_drop_unencrypted(rx, fc); | |
1403 | if (unlikely(res)) | |
1404 | return res; | |
1405 | ||
f2ca3ea4 JM |
1406 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1407 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1408 | rx->key)) | |
1409 | return -EACCES; | |
1410 | /* BIP does not use Protected field, so need to check MMIE */ | |
f64f9e71 JP |
1411 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
1412 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
f2ca3ea4 JM |
1413 | rx->key)) |
1414 | return -EACCES; | |
1415 | /* | |
1416 | * When using MFP, Action frames are not allowed prior to | |
1417 | * having configured keys. | |
1418 | */ | |
1419 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1420 | ieee80211_is_robust_mgmt_frame( | |
1421 | (struct ieee80211_hdr *) rx->skb->data))) | |
1422 | return -EACCES; | |
1423 | } | |
b3fc9c6c | 1424 | |
76ee65bf | 1425 | return 0; |
571ecf67 JB |
1426 | } |
1427 | ||
76ee65bf | 1428 | static int |
e31a16d6 | 1429 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1430 | { |
eb9fb5b8 | 1431 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee FF |
1432 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1433 | ||
9bc383de JB |
1434 | if (ieee80211_has_a4(hdr->frame_control) && |
1435 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1436 | return -1; |
9bc383de JB |
1437 | |
1438 | if (is_multicast_ether_addr(hdr->addr1) && | |
1439 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1440 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1441 | return -1; |
571ecf67 | 1442 | |
47846c9b | 1443 | return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
76ee65bf | 1444 | } |
571ecf67 | 1445 | |
ce3edf6d JB |
1446 | /* |
1447 | * requires that rx->skb is a frame with ethernet header | |
1448 | */ | |
358c8d9d | 1449 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1450 | { |
c97c23e3 | 1451 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1452 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1453 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1454 | ||
1455 | /* | |
1456 | * Allow EAPOL frames to us/the PAE group address regardless | |
1457 | * of whether the frame was encrypted or not. | |
1458 | */ | |
1459 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
47846c9b | 1460 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1461 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1462 | return true; | |
1463 | ||
1464 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1465 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1466 | return false; |
1467 | ||
1468 | return true; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * requires that rx->skb is a frame with ethernet header | |
1473 | */ | |
76ee65bf | 1474 | static void |
5cf121c3 | 1475 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1476 | { |
eb9fb5b8 JB |
1477 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1478 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1479 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1480 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1481 | struct sta_info *dsta; | |
571ecf67 | 1482 | |
76ee65bf RR |
1483 | skb = rx->skb; |
1484 | xmit_skb = NULL; | |
571ecf67 | 1485 | |
05c914fe JB |
1486 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1487 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1488 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
9bc383de JB |
1489 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
1490 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
ce3edf6d JB |
1491 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1492 | /* | |
1493 | * send multicast frames both to higher layers in | |
1494 | * local net stack and back to the wireless medium | |
1495 | */ | |
76ee65bf RR |
1496 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1497 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1498 | printk(KERN_DEBUG "%s: failed to clone " |
1499 | "multicast frame\n", dev->name); | |
1500 | } else { | |
abe60632 JB |
1501 | dsta = sta_info_get(sdata, skb->data); |
1502 | if (dsta) { | |
ce3edf6d JB |
1503 | /* |
1504 | * The destination station is associated to | |
1505 | * this AP (in this VLAN), so send the frame | |
1506 | * directly to it and do not pass it to local | |
1507 | * net stack. | |
571ecf67 | 1508 | */ |
76ee65bf | 1509 | xmit_skb = skb; |
571ecf67 JB |
1510 | skb = NULL; |
1511 | } | |
571ecf67 JB |
1512 | } |
1513 | } | |
1514 | ||
1515 | if (skb) { | |
d1c3a37c JB |
1516 | int align __maybe_unused; |
1517 | ||
59d9cb07 | 1518 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1519 | /* |
1520 | * 'align' will only take the values 0 or 2 here | |
1521 | * since all frames are required to be aligned | |
1522 | * to 2-byte boundaries when being passed to | |
1523 | * mac80211. That also explains the __skb_push() | |
1524 | * below. | |
1525 | */ | |
dacb6f1d | 1526 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1527 | if (align) { |
1528 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1529 | dev_kfree_skb(skb); | |
1530 | skb = NULL; | |
1531 | } else { | |
1532 | u8 *data = skb->data; | |
8ce0b589 ZY |
1533 | size_t len = skb_headlen(skb); |
1534 | skb->data -= align; | |
1535 | memmove(skb->data, data, len); | |
1536 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1537 | } |
1538 | } | |
1539 | #endif | |
1540 | ||
1541 | if (skb) { | |
1542 | /* deliver to local stack */ | |
1543 | skb->protocol = eth_type_trans(skb, dev); | |
1544 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1545 | netif_rx(skb); | |
1546 | } | |
571ecf67 JB |
1547 | } |
1548 | ||
76ee65bf | 1549 | if (xmit_skb) { |
571ecf67 | 1550 | /* send to wireless media */ |
f831e909 | 1551 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1552 | skb_reset_network_header(xmit_skb); |
1553 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1554 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1555 | } |
76ee65bf RR |
1556 | } |
1557 | ||
49461622 | 1558 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1559 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1560 | { |
eb9fb5b8 | 1561 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1562 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1563 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1564 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1565 | struct sk_buff_head frame_list; |
fd4c7f2f | 1566 | |
358c8d9d | 1567 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1568 | return RX_CONTINUE; |
fd4c7f2f | 1569 | |
358c8d9d | 1570 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1571 | return RX_DROP_MONITOR; |
fd4c7f2f | 1572 | |
5cf121c3 | 1573 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1574 | return RX_CONTINUE; |
fd4c7f2f | 1575 | |
eaf85ca7 ZY |
1576 | if (ieee80211_has_a4(hdr->frame_control) && |
1577 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1578 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1579 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1580 | |
eaf85ca7 ZY |
1581 | if (is_multicast_ether_addr(hdr->addr1) && |
1582 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1583 | rx->sdata->u.vlan.sta) || | |
1584 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1585 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1586 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1587 | |
eaf85ca7 ZY |
1588 | skb->dev = dev; |
1589 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1590 | |
eaf85ca7 ZY |
1591 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1592 | rx->sdata->vif.type, | |
1593 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1594 | |
eaf85ca7 ZY |
1595 | while (!skb_queue_empty(&frame_list)) { |
1596 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1597 | |
358c8d9d | 1598 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1599 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1600 | continue; |
1601 | } | |
eaf85ca7 ZY |
1602 | dev->stats.rx_packets++; |
1603 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1604 | |
1605 | ieee80211_deliver_skb(rx); | |
1606 | } | |
1607 | ||
9ae54c84 | 1608 | return RX_QUEUED; |
fd4c7f2f RR |
1609 | } |
1610 | ||
bf94e17b | 1611 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1612 | static ieee80211_rx_result |
e32f85f7 LCC |
1613 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1614 | { | |
1615 | struct ieee80211_hdr *hdr; | |
1616 | struct ieee80211s_hdr *mesh_hdr; | |
1617 | unsigned int hdrlen; | |
1618 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1619 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1620 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e32f85f7 LCC |
1621 | |
1622 | hdr = (struct ieee80211_hdr *) skb->data; | |
1623 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1624 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1625 | ||
1626 | if (!ieee80211_is_data(hdr->frame_control)) | |
1627 | return RX_CONTINUE; | |
1628 | ||
1629 | if (!mesh_hdr->ttl) | |
1630 | /* illegal frame */ | |
1631 | return RX_DROP_MONITOR; | |
1632 | ||
43b7b314 | 1633 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1634 | struct mesh_path *mppath; |
43b7b314 JC |
1635 | char *proxied_addr; |
1636 | char *mpp_addr; | |
1637 | ||
1638 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1639 | mpp_addr = hdr->addr3; | |
1640 | proxied_addr = mesh_hdr->eaddr1; | |
1641 | } else { | |
1642 | mpp_addr = hdr->addr4; | |
1643 | proxied_addr = mesh_hdr->eaddr2; | |
1644 | } | |
79617dee | 1645 | |
79617dee | 1646 | rcu_read_lock(); |
43b7b314 | 1647 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1648 | if (!mppath) { |
43b7b314 | 1649 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1650 | } else { |
1651 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1652 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1653 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1654 | spin_unlock_bh(&mppath->state_lock); |
1655 | } | |
1656 | rcu_read_unlock(); | |
1657 | } | |
1658 | ||
3c5772a5 JC |
1659 | /* Frame has reached destination. Don't forward */ |
1660 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1661 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1662 | return RX_CONTINUE; |
1663 | ||
1664 | mesh_hdr->ttl--; | |
1665 | ||
1666 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1667 | if (!mesh_hdr->ttl) | |
472dbc45 | 1668 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1669 | dropped_frames_ttl); |
1670 | else { | |
1671 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1672 | struct ieee80211_tx_info *info; |
1673 | ||
e32f85f7 LCC |
1674 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1675 | ||
1676 | if (!fwd_skb && net_ratelimit()) | |
1677 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1678 | sdata->name); |
e32f85f7 LCC |
1679 | |
1680 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1681 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1682 | info = IEEE80211_SKB_CB(fwd_skb); |
1683 | memset(info, 0, sizeof(*info)); | |
1684 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1685 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1686 | skb_set_queue_mapping(skb, |
1687 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1688 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1689 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1690 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1691 | fwded_mcast); | |
1692 | else { | |
3c5772a5 JC |
1693 | int err; |
1694 | /* | |
1695 | * Save TA to addr1 to send TA a path error if a | |
1696 | * suitable next hop is not found | |
1697 | */ | |
1698 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1699 | ETH_ALEN); |
3c5772a5 | 1700 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1701 | /* Failed to immediately resolve next hop: |
1702 | * fwded frame was dropped or will be added | |
1703 | * later to the pending skb queue. */ | |
1704 | if (err) | |
1705 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1706 | |
1707 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1708 | fwded_unicast); | |
249b405c JC |
1709 | } |
1710 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1711 | fwded_frames); | |
3b8d81e0 | 1712 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1713 | } |
1714 | } | |
1715 | ||
3c5772a5 | 1716 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1717 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1718 | return RX_CONTINUE; |
1719 | else | |
1720 | return RX_DROP_MONITOR; | |
1721 | } | |
bf94e17b | 1722 | #endif |
e32f85f7 | 1723 | |
49461622 | 1724 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1725 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1726 | { |
eb9fb5b8 | 1727 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1728 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1729 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1730 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1731 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1732 | int err; |
76ee65bf | 1733 | |
358c8d9d | 1734 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1735 | return RX_CONTINUE; |
76ee65bf | 1736 | |
358c8d9d | 1737 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1738 | return RX_DROP_MONITOR; |
76ee65bf | 1739 | |
f14543ee FF |
1740 | /* |
1741 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1742 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1743 | */ | |
1744 | if (ieee80211_has_a4(hdr->frame_control) && | |
1745 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1746 | return RX_DROP_MONITOR; | |
1747 | ||
e31a16d6 | 1748 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1749 | if (unlikely(err)) |
e4c26add | 1750 | return RX_DROP_UNUSABLE; |
76ee65bf | 1751 | |
358c8d9d | 1752 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1753 | return RX_DROP_MONITOR; |
ce3edf6d | 1754 | |
76ee65bf RR |
1755 | rx->skb->dev = dev; |
1756 | ||
1757 | dev->stats.rx_packets++; | |
1758 | dev->stats.rx_bytes += rx->skb->len; | |
1759 | ||
e15276a4 VN |
1760 | if (ieee80211_is_data(hdr->frame_control) && |
1761 | !is_multicast_ether_addr(hdr->addr1) && | |
1762 | local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) { | |
1763 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
1764 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1765 | } | |
1766 | ||
76ee65bf | 1767 | ieee80211_deliver_skb(rx); |
571ecf67 | 1768 | |
9ae54c84 | 1769 | return RX_QUEUED; |
571ecf67 JB |
1770 | } |
1771 | ||
49461622 | 1772 | static ieee80211_rx_result debug_noinline |
2569a826 | 1773 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
71364716 RR |
1774 | { |
1775 | struct ieee80211_local *local = rx->local; | |
1776 | struct ieee80211_hw *hw = &local->hw; | |
1777 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1778 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1779 | struct tid_ampdu_rx *tid_agg_rx; |
1780 | u16 start_seq_num; | |
1781 | u16 tid; | |
1782 | ||
a7767f95 | 1783 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1784 | return RX_CONTINUE; |
71364716 | 1785 | |
a7767f95 | 1786 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1787 | if (!rx->sta) |
a02ae758 | 1788 | return RX_DROP_MONITOR; |
71364716 | 1789 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1790 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1791 | != HT_AGG_STATE_OPERATIONAL) | |
a02ae758 | 1792 | return RX_DROP_MONITOR; |
cee24a3e | 1793 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1794 | |
1795 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1796 | ||
1797 | /* reset session timer */ | |
20ad19d0 JB |
1798 | if (tid_agg_rx->timeout) |
1799 | mod_timer(&tid_agg_rx->session_timer, | |
1800 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1801 | |
a02ae758 | 1802 | /* release stored frames up to start of BAR */ |
2569a826 JB |
1803 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
1804 | frames); | |
a02ae758 JB |
1805 | kfree_skb(skb); |
1806 | return RX_QUEUED; | |
71364716 RR |
1807 | } |
1808 | ||
9ae54c84 | 1809 | return RX_CONTINUE; |
71364716 RR |
1810 | } |
1811 | ||
f4f727a6 JM |
1812 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1813 | struct ieee80211_mgmt *mgmt, | |
1814 | size_t len) | |
fea14732 JM |
1815 | { |
1816 | struct ieee80211_local *local = sdata->local; | |
1817 | struct sk_buff *skb; | |
1818 | struct ieee80211_mgmt *resp; | |
1819 | ||
47846c9b | 1820 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
1821 | /* Not to own unicast address */ |
1822 | return; | |
1823 | } | |
1824 | ||
46900298 JB |
1825 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1826 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1827 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1828 | return; |
1829 | } | |
1830 | ||
1831 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1832 | /* Too short SA Query request frame */ | |
1833 | return; | |
1834 | } | |
1835 | ||
1836 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1837 | if (skb == NULL) | |
1838 | return; | |
1839 | ||
1840 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1841 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1842 | memset(resp, 0, 24); | |
1843 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 1844 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 1845 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1846 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1847 | IEEE80211_STYPE_ACTION); | |
1848 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1849 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1850 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1851 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1852 | mgmt->u.action.u.sa_query.trans_id, | |
1853 | WLAN_SA_QUERY_TR_ID_LEN); | |
1854 | ||
62ae67be | 1855 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
1856 | } |
1857 | ||
de1ede7a JB |
1858 | static ieee80211_rx_result debug_noinline |
1859 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1860 | { | |
1861 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 1862 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 1863 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
84040805 | 1864 | struct sk_buff *nskb; |
026331c4 | 1865 | struct ieee80211_rx_status *status; |
de1ede7a JB |
1866 | int len = rx->skb->len; |
1867 | ||
1868 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1869 | return RX_CONTINUE; | |
1870 | ||
026331c4 JM |
1871 | /* drop too small frames */ |
1872 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 1873 | return RX_DROP_UNUSABLE; |
de1ede7a | 1874 | |
026331c4 | 1875 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 1876 | return RX_DROP_UNUSABLE; |
de1ede7a | 1877 | |
026331c4 | 1878 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 1879 | return RX_DROP_UNUSABLE; |
97ebe12a | 1880 | |
bef5d1c7 | 1881 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
84040805 JB |
1882 | return RX_DROP_UNUSABLE; |
1883 | ||
de1ede7a JB |
1884 | switch (mgmt->u.action.category) { |
1885 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1886 | /* |
1887 | * The aggregation code is not prepared to handle | |
1888 | * anything but STA/AP due to the BSSID handling; | |
1889 | * IBSS could work in the code but isn't supported | |
1890 | * by drivers or the standard. | |
1891 | */ | |
1892 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1893 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1894 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 1895 | break; |
8abd3f9b | 1896 | |
026331c4 JM |
1897 | /* verify action_code is present */ |
1898 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1899 | break; | |
1900 | ||
de1ede7a JB |
1901 | switch (mgmt->u.action.u.addba_req.action_code) { |
1902 | case WLAN_ACTION_ADDBA_REQ: | |
1903 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1904 | sizeof(mgmt->u.action.u.addba_req))) | |
1905 | return RX_DROP_MONITOR; | |
1906 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
84040805 | 1907 | goto handled; |
de1ede7a JB |
1908 | case WLAN_ACTION_ADDBA_RESP: |
1909 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1910 | sizeof(mgmt->u.action.u.addba_resp))) | |
84040805 | 1911 | break; |
de1ede7a | 1912 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); |
84040805 | 1913 | goto handled; |
de1ede7a JB |
1914 | case WLAN_ACTION_DELBA: |
1915 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1916 | sizeof(mgmt->u.action.u.delba))) | |
84040805 | 1917 | break; |
de1ede7a | 1918 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); |
84040805 | 1919 | goto handled; |
de1ede7a | 1920 | } |
39192c0b JB |
1921 | break; |
1922 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1923 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 1924 | break; |
46900298 JB |
1925 | |
1926 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 1927 | break; |
46900298 | 1928 | |
026331c4 JM |
1929 | /* verify action_code is present */ |
1930 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1931 | break; | |
1932 | ||
39192c0b JB |
1933 | switch (mgmt->u.action.u.measurement.action_code) { |
1934 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1935 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1936 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 1937 | break; |
39192c0b | 1938 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 1939 | goto handled; |
c481ec97 S |
1940 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1941 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1942 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 1943 | break; |
c481ec97 | 1944 | |
cc32abd4 | 1945 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 1946 | break; |
cc32abd4 | 1947 | |
46900298 | 1948 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 1949 | break; |
c481ec97 | 1950 | |
77fdaa12 | 1951 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1952 | } |
1953 | break; | |
fea14732 JM |
1954 | case WLAN_CATEGORY_SA_QUERY: |
1955 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1956 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
1957 | break; |
1958 | ||
fea14732 JM |
1959 | switch (mgmt->u.action.u.sa_query.action) { |
1960 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1961 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 1962 | break; |
fea14732 | 1963 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 1964 | goto handled; |
fea14732 JM |
1965 | } |
1966 | break; | |
84040805 | 1967 | } |
026331c4 | 1968 | |
84040805 JB |
1969 | /* |
1970 | * For AP mode, hostapd is responsible for handling any action | |
1971 | * frames that we didn't handle, including returning unknown | |
1972 | * ones. For all other modes we will return them to the sender, | |
1973 | * setting the 0x80 bit in the action category, as required by | |
1974 | * 802.11-2007 7.3.1.11. | |
1975 | */ | |
1976 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
1977 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
1978 | return RX_DROP_MONITOR; | |
d7907448 | 1979 | |
026331c4 JM |
1980 | /* |
1981 | * Getting here means the kernel doesn't know how to handle | |
1982 | * it, but maybe userspace does ... include returned frames | |
1983 | * so userspace can register for those to know whether ones | |
1984 | * it transmitted were processed or returned. | |
1985 | */ | |
1986 | status = IEEE80211_SKB_RXCB(rx->skb); | |
1987 | ||
1988 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
1989 | cfg80211_rx_action(rx->sdata->dev, status->freq, | |
1990 | rx->skb->data, rx->skb->len, | |
1991 | GFP_ATOMIC)) | |
1992 | goto handled; | |
1993 | ||
84040805 JB |
1994 | /* do not return rejected action frames */ |
1995 | if (mgmt->u.action.category & 0x80) | |
1996 | return RX_DROP_UNUSABLE; | |
1997 | ||
1998 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
1999 | GFP_ATOMIC); | |
2000 | if (nskb) { | |
2001 | struct ieee80211_mgmt *mgmt = (void *)nskb->data; | |
2002 | ||
2003 | mgmt->u.action.category |= 0x80; | |
2004 | memcpy(mgmt->da, mgmt->sa, ETH_ALEN); | |
2005 | memcpy(mgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
2006 | ||
2007 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2008 | ||
2009 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a JB |
2010 | } |
2011 | ||
84040805 | 2012 | handled: |
026331c4 JM |
2013 | if (rx->sta) |
2014 | rx->sta->rx_packets++; | |
39192c0b JB |
2015 | dev_kfree_skb(rx->skb); |
2016 | return RX_QUEUED; | |
de1ede7a JB |
2017 | } |
2018 | ||
49461622 | 2019 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2020 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2021 | { |
eb9fb5b8 | 2022 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2023 | ieee80211_rx_result rxs; |
571ecf67 | 2024 | |
5cf121c3 | 2025 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 2026 | return RX_DROP_MONITOR; |
571ecf67 | 2027 | |
bef5d1c7 JB |
2028 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
2029 | return RX_DROP_UNUSABLE; | |
97ebe12a | 2030 | |
af6b6374 JB |
2031 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2032 | if (rxs != RX_CONTINUE) | |
2033 | return rxs; | |
2034 | ||
472dbc45 | 2035 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 2036 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 2037 | |
3832c287 | 2038 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 2039 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 2040 | |
7986cf95 | 2041 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 2042 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 2043 | |
7986cf95 | 2044 | return RX_DROP_MONITOR; |
571ecf67 JB |
2045 | } |
2046 | ||
3b8d81e0 | 2047 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2048 | struct ieee80211_rx_data *rx) |
571ecf67 | 2049 | { |
a7767f95 HH |
2050 | int keyidx; |
2051 | unsigned int hdrlen; | |
571ecf67 | 2052 | |
a7767f95 | 2053 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2054 | if (rx->skb->len >= hdrlen + 4) |
2055 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2056 | else | |
2057 | keyidx = -1; | |
2058 | ||
8944b79f | 2059 | if (!rx->sta) { |
aa0daf0e JB |
2060 | /* |
2061 | * Some hardware seem to generate incorrect Michael MIC | |
2062 | * reports; ignore them to avoid triggering countermeasures. | |
2063 | */ | |
af2ced6a | 2064 | return; |
571ecf67 JB |
2065 | } |
2066 | ||
a7767f95 | 2067 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2068 | return; |
571ecf67 | 2069 | |
05c914fe | 2070 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2071 | /* |
2072 | * APs with pairwise keys should never receive Michael MIC | |
2073 | * errors for non-zero keyidx because these are reserved for | |
2074 | * group keys and only the AP is sending real multicast | |
2075 | * frames in the BSS. | |
2076 | */ | |
af2ced6a | 2077 | return; |
571ecf67 JB |
2078 | } |
2079 | ||
a7767f95 HH |
2080 | if (!ieee80211_is_data(hdr->frame_control) && |
2081 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2082 | return; |
571ecf67 | 2083 | |
e6d6e342 JB |
2084 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2085 | GFP_ATOMIC); | |
571ecf67 JB |
2086 | } |
2087 | ||
5cf121c3 | 2088 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2089 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2090 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2091 | { |
2092 | struct ieee80211_sub_if_data *sdata; | |
2093 | struct ieee80211_local *local = rx->local; | |
2094 | struct ieee80211_rtap_hdr { | |
2095 | struct ieee80211_radiotap_header hdr; | |
2096 | u8 flags; | |
5f0b7de5 | 2097 | u8 rate_or_pad; |
3d30d949 MW |
2098 | __le16 chan_freq; |
2099 | __le16 chan_flags; | |
2100 | } __attribute__ ((packed)) *rthdr; | |
2101 | struct sk_buff *skb = rx->skb, *skb2; | |
2102 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2103 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2104 | |
8c0c709e | 2105 | if (status->flag & RX_FLAG_INTERNAL_CMTR) |
3d30d949 MW |
2106 | goto out_free_skb; |
2107 | ||
2108 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
2109 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2110 | goto out_free_skb; | |
2111 | ||
2112 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2113 | memset(rthdr, 0, sizeof(*rthdr)); | |
2114 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2115 | rthdr->hdr.it_present = | |
2116 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2117 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2118 | ||
5f0b7de5 JB |
2119 | if (rate) { |
2120 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2121 | rthdr->hdr.it_present |= | |
2122 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2123 | } | |
3d30d949 MW |
2124 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2125 | ||
2126 | if (status->band == IEEE80211_BAND_5GHZ) | |
2127 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2128 | IEEE80211_CHAN_5GHZ); | |
2129 | else | |
2130 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2131 | IEEE80211_CHAN_2GHZ); | |
2132 | ||
2133 | skb_set_mac_header(skb, 0); | |
2134 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2135 | skb->pkt_type = PACKET_OTHERHOST; | |
2136 | skb->protocol = htons(ETH_P_802_2); | |
2137 | ||
2138 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2139 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2140 | continue; |
2141 | ||
05c914fe | 2142 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2143 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2144 | continue; | |
2145 | ||
2146 | if (prev_dev) { | |
2147 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2148 | if (skb2) { | |
2149 | skb2->dev = prev_dev; | |
2150 | netif_rx(skb2); | |
2151 | } | |
2152 | } | |
2153 | ||
2154 | prev_dev = sdata->dev; | |
2155 | sdata->dev->stats.rx_packets++; | |
2156 | sdata->dev->stats.rx_bytes += skb->len; | |
2157 | } | |
2158 | ||
2159 | if (prev_dev) { | |
2160 | skb->dev = prev_dev; | |
2161 | netif_rx(skb); | |
2162 | skb = NULL; | |
2163 | } else | |
2164 | goto out_free_skb; | |
2165 | ||
8c0c709e | 2166 | status->flag |= RX_FLAG_INTERNAL_CMTR; |
3d30d949 MW |
2167 | return; |
2168 | ||
2169 | out_free_skb: | |
2170 | dev_kfree_skb(skb); | |
2171 | } | |
2172 | ||
571ecf67 | 2173 | |
8944b79f | 2174 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2175 | struct ieee80211_rx_data *rx, |
5f0b7de5 JB |
2176 | struct sk_buff *skb, |
2177 | struct ieee80211_rate *rate) | |
58905290 | 2178 | { |
2569a826 | 2179 | struct sk_buff_head reorder_release; |
58905290 JB |
2180 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2181 | ||
2569a826 JB |
2182 | __skb_queue_head_init(&reorder_release); |
2183 | ||
8944b79f JB |
2184 | rx->skb = skb; |
2185 | rx->sdata = sdata; | |
8944b79f | 2186 | |
e32f85f7 LCC |
2187 | #define CALL_RXH(rxh) \ |
2188 | do { \ | |
2189 | res = rxh(rx); \ | |
2190 | if (res != RX_CONTINUE) \ | |
2569a826 | 2191 | goto rxh_next; \ |
e32f85f7 | 2192 | } while (0); |
49461622 | 2193 | |
2569a826 JB |
2194 | /* |
2195 | * NB: the rxh_next label works even if we jump | |
2196 | * to it from here because then the list will | |
2197 | * be empty, which is a trivial check | |
2198 | */ | |
49461622 JB |
2199 | CALL_RXH(ieee80211_rx_h_passive_scan) |
2200 | CALL_RXH(ieee80211_rx_h_check) | |
2569a826 JB |
2201 | |
2202 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); | |
2203 | ||
2204 | while ((skb = __skb_dequeue(&reorder_release))) { | |
2205 | /* | |
2206 | * all the other fields are valid across frames | |
2207 | * that belong to an aMPDU since they are on the | |
2208 | * same TID from the same station | |
2209 | */ | |
2210 | rx->skb = skb; | |
2211 | ||
2212 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2213 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2214 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2215 | CALL_RXH(ieee80211_rx_h_defragment) | |
2216 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2217 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2218 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2219 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2220 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2221 | #ifdef CONFIG_MAC80211_MESH |
2569a826 JB |
2222 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2223 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2224 | #endif |
2569a826 JB |
2225 | CALL_RXH(ieee80211_rx_h_data) |
2226 | ||
2227 | /* special treatment -- needs the queue */ | |
2228 | res = ieee80211_rx_h_ctrl(rx, &reorder_release); | |
2229 | if (res != RX_CONTINUE) | |
2230 | goto rxh_next; | |
2231 | ||
2232 | CALL_RXH(ieee80211_rx_h_action) | |
2233 | CALL_RXH(ieee80211_rx_h_mgmt) | |
49461622 JB |
2234 | |
2235 | #undef CALL_RXH | |
2236 | ||
2569a826 JB |
2237 | rxh_next: |
2238 | switch (res) { | |
2239 | case RX_DROP_MONITOR: | |
2240 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2241 | if (rx->sta) | |
2242 | rx->sta->rx_dropped++; | |
2243 | /* fall through */ | |
2244 | case RX_CONTINUE: | |
2245 | ieee80211_rx_cooked_monitor(rx, rate); | |
2246 | break; | |
2247 | case RX_DROP_UNUSABLE: | |
2248 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2249 | if (rx->sta) | |
2250 | rx->sta->rx_dropped++; | |
2251 | dev_kfree_skb(rx->skb); | |
2252 | break; | |
2253 | case RX_QUEUED: | |
2254 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2255 | break; | |
2256 | } | |
58905290 JB |
2257 | } |
2258 | } | |
2259 | ||
571ecf67 JB |
2260 | /* main receive path */ |
2261 | ||
23a24def | 2262 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2263 | struct ieee80211_rx_data *rx, |
23a24def JB |
2264 | struct ieee80211_hdr *hdr) |
2265 | { | |
eb9fb5b8 JB |
2266 | struct sk_buff *skb = rx->skb; |
2267 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2268 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2269 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2270 | ||
51fb61e7 | 2271 | switch (sdata->vif.type) { |
05c914fe | 2272 | case NL80211_IFTYPE_STATION: |
9bc383de | 2273 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2274 | return 0; |
77fdaa12 | 2275 | if (!multicast && |
47846c9b | 2276 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2277 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2278 | return 0; |
5cf121c3 | 2279 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2280 | } |
2281 | break; | |
05c914fe | 2282 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2283 | if (!bssid) |
2284 | return 0; | |
a7767f95 | 2285 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2286 | return 1; |
87291c02 | 2287 | } |
46900298 | 2288 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2289 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2290 | return 0; |
5cf121c3 | 2291 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2292 | } else if (!multicast && |
47846c9b | 2293 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2294 | hdr->addr1) != 0) { |
4150c572 | 2295 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2296 | return 0; |
5cf121c3 | 2297 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2298 | } else if (!rx->sta) { |
2299 | int rate_idx; | |
eb9fb5b8 | 2300 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2301 | rate_idx = 0; /* TODO: HT rates */ |
2302 | else | |
eb9fb5b8 | 2303 | rate_idx = status->rate_idx; |
34e89507 JB |
2304 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2305 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2306 | } |
23a24def | 2307 | break; |
05c914fe | 2308 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2309 | if (!multicast && |
47846c9b | 2310 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2311 | hdr->addr1) != 0) { |
2312 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2313 | return 0; | |
2314 | ||
5cf121c3 | 2315 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2316 | } |
2317 | break; | |
05c914fe JB |
2318 | case NL80211_IFTYPE_AP_VLAN: |
2319 | case NL80211_IFTYPE_AP: | |
23a24def | 2320 | if (!bssid) { |
47846c9b | 2321 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2322 | hdr->addr1)) |
2323 | return 0; | |
2324 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2325 | sdata->vif.addr)) { |
5cf121c3 | 2326 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2327 | return 0; |
5cf121c3 | 2328 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2329 | } |
23a24def | 2330 | break; |
05c914fe | 2331 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2332 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2333 | return 0; |
2334 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2335 | return 0; | |
2336 | break; | |
05c914fe | 2337 | case NL80211_IFTYPE_MONITOR: |
05c914fe JB |
2338 | case NL80211_IFTYPE_UNSPECIFIED: |
2339 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2340 | /* should never get here */ |
2341 | WARN_ON(1); | |
2342 | break; | |
23a24def JB |
2343 | } |
2344 | ||
2345 | return 1; | |
2346 | } | |
2347 | ||
571ecf67 | 2348 | /* |
6368e4b1 RR |
2349 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2350 | * be called with rcu_read_lock protection. | |
571ecf67 | 2351 | */ |
71ebb4aa RR |
2352 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2353 | struct sk_buff *skb, | |
8318d78a | 2354 | struct ieee80211_rate *rate) |
571ecf67 | 2355 | { |
f1d58c25 | 2356 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2357 | struct ieee80211_local *local = hw_to_local(hw); |
2358 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2359 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2360 | struct ieee80211_rx_data rx; |
6368e4b1 | 2361 | int prepares; |
8e6f0032 JB |
2362 | struct ieee80211_sub_if_data *prev = NULL; |
2363 | struct sk_buff *skb_new; | |
abe60632 JB |
2364 | struct sta_info *sta, *tmp; |
2365 | bool found_sta = false; | |
571ecf67 | 2366 | |
358c8d9d | 2367 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2368 | memset(&rx, 0, sizeof(rx)); |
2369 | rx.skb = skb; | |
2370 | rx.local = local; | |
72abd81b | 2371 | |
358c8d9d | 2372 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2373 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2374 | |
142b9f50 HS |
2375 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2376 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2377 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2378 | |
38f3714d | 2379 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2380 | ieee80211_verify_alignment(&rx); |
38f3714d | 2381 | |
abe60632 JB |
2382 | if (ieee80211_is_data(hdr->frame_control)) { |
2383 | for_each_sta_info(local, hdr->addr2, sta, tmp) { | |
2384 | rx.sta = sta; | |
2385 | found_sta = true; | |
2386 | rx.sdata = sta->sdata; | |
2387 | ||
2388 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2389 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
2390 | if (prepares) { | |
2391 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2392 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2393 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2394 | } else | |
2395 | prev = rx.sdata; | |
2396 | } | |
af2ced6a | 2397 | } |
abe60632 JB |
2398 | } |
2399 | if (!found_sta) { | |
2400 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2401 | if (!ieee80211_sdata_running(sdata)) |
abe60632 | 2402 | continue; |
2a8a9a88 | 2403 | |
abe60632 JB |
2404 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2405 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2406 | continue; | |
b2e7771e | 2407 | |
abe60632 JB |
2408 | /* |
2409 | * frame is destined for this interface, but if it's | |
2410 | * not also for the previous one we handle that after | |
2411 | * the loop to avoid copying the SKB once too much | |
2412 | */ | |
340e11f3 | 2413 | |
abe60632 JB |
2414 | if (!prev) { |
2415 | prev = sdata; | |
2416 | continue; | |
2417 | } | |
340e11f3 | 2418 | |
4754ffd6 | 2419 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2420 | |
2421 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2422 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2423 | ||
2424 | if (!prepares) | |
2425 | goto next; | |
2426 | ||
2427 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2428 | rx.sdata = prev; | |
2429 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2430 | ieee80211_rx_michael_mic_report(hdr, | |
2431 | &rx); | |
2432 | goto next; | |
2433 | } | |
2434 | ||
abe60632 JB |
2435 | /* |
2436 | * frame was destined for the previous interface | |
2437 | * so invoke RX handlers for it | |
2438 | */ | |
2439 | ||
2440 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2441 | if (!skb_new) { | |
2442 | if (net_ratelimit()) | |
2443 | printk(KERN_DEBUG "%s: failed to copy " | |
2444 | "multicast frame for %s\n", | |
2445 | wiphy_name(local->hw.wiphy), | |
47846c9b | 2446 | prev->name); |
4bb29f8c | 2447 | goto next; |
abe60632 JB |
2448 | } |
2449 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate); | |
4bb29f8c | 2450 | next: |
abe60632 | 2451 | prev = sdata; |
340e11f3 | 2452 | } |
4bb29f8c FF |
2453 | |
2454 | if (prev) { | |
4754ffd6 | 2455 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2456 | |
2457 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2458 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2459 | ||
2460 | if (!prepares) | |
2461 | prev = NULL; | |
2462 | } | |
571ecf67 | 2463 | } |
a4b7d7bd | 2464 | if (prev) |
5f0b7de5 | 2465 | ieee80211_invoke_rx_handlers(prev, &rx, skb, rate); |
a4b7d7bd | 2466 | else |
8e6f0032 | 2467 | dev_kfree_skb(skb); |
571ecf67 | 2468 | } |
6368e4b1 RR |
2469 | |
2470 | /* | |
2471 | * This is the receive path handler. It is called by a low level driver when an | |
2472 | * 802.11 MPDU is received from the hardware. | |
2473 | */ | |
103bf9f7 | 2474 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2475 | { |
2476 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2477 | struct ieee80211_rate *rate = NULL; |
2478 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2479 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2480 | |
d20ef63d JB |
2481 | WARN_ON_ONCE(softirq_count() == 0); |
2482 | ||
77a980dc JB |
2483 | if (WARN_ON(status->band < 0 || |
2484 | status->band >= IEEE80211_NUM_BANDS)) | |
2485 | goto drop; | |
8318d78a JB |
2486 | |
2487 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2488 | if (WARN_ON(!sband)) |
2489 | goto drop; | |
8318d78a | 2490 | |
89c3a8ac JB |
2491 | /* |
2492 | * If we're suspending, it is possible although not too likely | |
2493 | * that we'd be receiving frames after having already partially | |
2494 | * quiesced the stack. We can't process such frames then since | |
2495 | * that might, for example, cause stations to be added or other | |
2496 | * driver callbacks be invoked. | |
2497 | */ | |
77a980dc JB |
2498 | if (unlikely(local->quiescing || local->suspended)) |
2499 | goto drop; | |
89c3a8ac | 2500 | |
ea77f12f JB |
2501 | /* |
2502 | * The same happens when we're not even started, | |
2503 | * but that's worth a warning. | |
2504 | */ | |
77a980dc JB |
2505 | if (WARN_ON(!local->started)) |
2506 | goto drop; | |
ea77f12f | 2507 | |
0fb8ca45 | 2508 | if (status->flag & RX_FLAG_HT) { |
e5d6eb83 LR |
2509 | /* |
2510 | * rate_idx is MCS index, which can be [0-76] as documented on: | |
2511 | * | |
2512 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2513 | * | |
2514 | * Anything else would be some sort of driver or hardware error. | |
2515 | * The driver should catch hardware errors. | |
2516 | */ | |
2517 | if (WARN((status->rate_idx < 0 || | |
2518 | status->rate_idx > 76), | |
2519 | "Rate marked as an HT rate but passed " | |
2520 | "status->rate_idx is not " | |
2521 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2522 | status->rate_idx, | |
2523 | status->rate_idx)) | |
77a980dc | 2524 | goto drop; |
0fb8ca45 JM |
2525 | } else { |
2526 | if (WARN_ON(status->rate_idx < 0 || | |
2527 | status->rate_idx >= sband->n_bitrates)) | |
77a980dc | 2528 | goto drop; |
0fb8ca45 JM |
2529 | rate = &sband->bitrates[status->rate_idx]; |
2530 | } | |
6368e4b1 RR |
2531 | |
2532 | /* | |
2533 | * key references and virtual interfaces are protected using RCU | |
2534 | * and this requires that we are in a read-side RCU section during | |
2535 | * receive processing | |
2536 | */ | |
2537 | rcu_read_lock(); | |
2538 | ||
2539 | /* | |
2540 | * Frames with failed FCS/PLCP checksum are not returned, | |
2541 | * all other frames are returned without radiotap header | |
2542 | * if it was previously present. | |
2543 | * Also, frames with less than 16 bytes are dropped. | |
2544 | */ | |
f1d58c25 | 2545 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2546 | if (!skb) { |
2547 | rcu_read_unlock(); | |
2548 | return; | |
2549 | } | |
2550 | ||
2569a826 | 2551 | __ieee80211_rx_handle_packet(hw, skb, rate); |
6368e4b1 RR |
2552 | |
2553 | rcu_read_unlock(); | |
77a980dc JB |
2554 | |
2555 | return; | |
2556 | drop: | |
2557 | kfree_skb(skb); | |
6368e4b1 | 2558 | } |
103bf9f7 | 2559 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2560 | |
2561 | /* This is a version of the rx handler that can be called from hard irq | |
2562 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2563 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2564 | { |
2565 | struct ieee80211_local *local = hw_to_local(hw); | |
2566 | ||
2567 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2568 | ||
571ecf67 JB |
2569 | skb->pkt_type = IEEE80211_RX_MSG; |
2570 | skb_queue_tail(&local->skb_queue, skb); | |
2571 | tasklet_schedule(&local->tasklet); | |
2572 | } | |
2573 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |