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Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
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 | ||
181 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
182 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
183 | *pos = status->noise; | |
184 | rthdr->it_present |= | |
185 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
186 | pos++; | |
187 | } | |
188 | ||
189 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
190 | ||
191 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
192 | *pos = status->antenna; | |
193 | pos++; | |
194 | ||
601ae7f2 BR |
195 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
196 | ||
197 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
198 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 199 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 200 | pos++; |
aae89831 | 201 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
202 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
203 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
204 | pos += 2; |
205 | } | |
206 | ||
b2e7771e JB |
207 | /* |
208 | * This function copies a received frame to all monitor interfaces and | |
209 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
210 | * radiotap header the driver might have added. | |
211 | */ | |
212 | static struct sk_buff * | |
213 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 214 | struct ieee80211_rate *rate) |
b2e7771e | 215 | { |
f1d58c25 | 216 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 217 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 218 | int needed_headroom = 0; |
b2e7771e JB |
219 | struct sk_buff *skb, *skb2; |
220 | struct net_device *prev_dev = NULL; | |
221 | int present_fcs_len = 0; | |
b2e7771e JB |
222 | |
223 | /* | |
224 | * First, we may need to make a copy of the skb because | |
225 | * (1) we need to modify it for radiotap (if not present), and | |
226 | * (2) the other RX handlers will modify the skb we got. | |
227 | * | |
228 | * We don't need to, of course, if we aren't going to return | |
229 | * the SKB because it has a bad FCS/PLCP checksum. | |
230 | */ | |
0869aea0 JB |
231 | |
232 | /* room for the radiotap header based on driver features */ | |
233 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
234 | |
235 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
236 | present_fcs_len = FCS_LEN; | |
237 | ||
238 | if (!local->monitors) { | |
0869aea0 | 239 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
240 | dev_kfree_skb(origskb); |
241 | return NULL; | |
242 | } | |
243 | ||
0869aea0 | 244 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
245 | } |
246 | ||
0869aea0 | 247 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
248 | /* only need to expand headroom if necessary */ |
249 | skb = origskb; | |
250 | origskb = NULL; | |
251 | ||
252 | /* | |
253 | * This shouldn't trigger often because most devices have an | |
254 | * RX header they pull before we get here, and that should | |
255 | * be big enough for our radiotap information. We should | |
256 | * probably export the length to drivers so that we can have | |
257 | * them allocate enough headroom to start with. | |
258 | */ | |
259 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 260 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
261 | dev_kfree_skb(skb); |
262 | return NULL; | |
263 | } | |
264 | } else { | |
265 | /* | |
266 | * Need to make a copy and possibly remove radiotap header | |
267 | * and FCS from the original. | |
268 | */ | |
269 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
270 | ||
0869aea0 | 271 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
272 | |
273 | if (!skb) | |
274 | return origskb; | |
275 | } | |
276 | ||
0869aea0 JB |
277 | /* prepend radiotap information */ |
278 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 279 | |
ce3edf6d | 280 | skb_reset_mac_header(skb); |
b2e7771e JB |
281 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
282 | skb->pkt_type = PACKET_OTHERHOST; | |
283 | skb->protocol = htons(ETH_P_802_2); | |
284 | ||
285 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 286 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
287 | continue; |
288 | ||
3d30d949 MW |
289 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
290 | continue; | |
291 | ||
9607e6b6 | 292 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
293 | continue; |
294 | ||
b2e7771e JB |
295 | if (prev_dev) { |
296 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
297 | if (skb2) { | |
298 | skb2->dev = prev_dev; | |
299 | netif_rx(skb2); | |
300 | } | |
301 | } | |
302 | ||
303 | prev_dev = sdata->dev; | |
304 | sdata->dev->stats.rx_packets++; | |
305 | sdata->dev->stats.rx_bytes += skb->len; | |
306 | } | |
307 | ||
308 | if (prev_dev) { | |
309 | skb->dev = prev_dev; | |
310 | netif_rx(skb); | |
311 | } else | |
312 | dev_kfree_skb(skb); | |
313 | ||
314 | return origskb; | |
315 | } | |
316 | ||
317 | ||
5cf121c3 | 318 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 319 | { |
238f74a2 | 320 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
321 | int tid; |
322 | ||
323 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
324 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
325 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 326 | /* frame has qos control */ |
238f74a2 HH |
327 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
328 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 329 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 330 | else |
5cf121c3 | 331 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 332 | } else { |
1411f9b5 JB |
333 | /* |
334 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
335 | * | |
336 | * Sequence numbers for management frames, QoS data | |
337 | * frames with a broadcast/multicast address in the | |
338 | * Address 1 field, and all non-QoS data frames sent | |
339 | * by QoS STAs are assigned using an additional single | |
340 | * modulo-4096 counter, [...] | |
341 | * | |
342 | * We also use that counter for non-QoS STAs. | |
343 | */ | |
344 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 345 | } |
52865dfd | 346 | |
5cf121c3 | 347 | rx->queue = tid; |
6e0d114d JB |
348 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
349 | * For now, set skb->priority to 0 for other cases. */ | |
350 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 351 | } |
6e0d114d | 352 | |
d1c3a37c JB |
353 | /** |
354 | * DOC: Packet alignment | |
355 | * | |
356 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
357 | * to the stack. | |
358 | * | |
359 | * Additionally, should, if possible, align the payload data in a way that | |
360 | * guarantees that the contained IP header is aligned to a four-byte | |
361 | * boundary. In the case of regular frames, this simply means aligning the | |
362 | * payload to a four-byte boundary (because either the IP header is directly | |
363 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
364 | * in front of it). If the payload data is not properly aligned and the |
365 | * architecture doesn't support efficient unaligned operations, mac80211 | |
366 | * will align the data. | |
d1c3a37c JB |
367 | * |
368 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
369 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
370 | * push the IP header further back to a multiple of four again. Thankfully, the | |
371 | * specs were sane enough this time around to require padding each A-MSDU | |
372 | * subframe to a length that is a multiple of four. | |
373 | * | |
374 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
375 | * the payload is not supported, the driver is required to move the 802.11 | |
376 | * header to be directly in front of the payload in that case. | |
377 | */ | |
378 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 379 | { |
59d9cb07 KV |
380 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
381 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
382 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 383 | #endif |
6e0d114d JB |
384 | } |
385 | ||
6368e4b1 | 386 | |
571ecf67 JB |
387 | /* rx handlers */ |
388 | ||
49461622 | 389 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 390 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
391 | { |
392 | struct ieee80211_local *local = rx->local; | |
393 | struct sk_buff *skb = rx->skb; | |
394 | ||
fbe9c429 | 395 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 396 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 397 | |
142b9f50 HS |
398 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
399 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 400 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 401 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 402 | dev_kfree_skb(skb); |
9ae54c84 | 403 | return RX_QUEUED; |
571ecf67 JB |
404 | } |
405 | ||
5cf121c3 | 406 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
407 | /* scanning finished during invoking of handlers */ |
408 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 409 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
410 | } |
411 | ||
9ae54c84 | 412 | return RX_CONTINUE; |
571ecf67 JB |
413 | } |
414 | ||
3cfcf6ac JM |
415 | |
416 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
417 | { | |
418 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
419 | ||
420 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
421 | return 0; | |
422 | ||
423 | return ieee80211_is_robust_mgmt_frame(hdr); | |
424 | } | |
425 | ||
426 | ||
427 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
428 | { | |
429 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
430 | ||
431 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
432 | return 0; | |
433 | ||
434 | return ieee80211_is_robust_mgmt_frame(hdr); | |
435 | } | |
436 | ||
437 | ||
438 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
439 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
440 | { | |
441 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
442 | struct ieee80211_mmie *mmie; | |
443 | ||
444 | if (skb->len < 24 + sizeof(*mmie) || | |
445 | !is_multicast_ether_addr(hdr->da)) | |
446 | return -1; | |
447 | ||
448 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
449 | return -1; /* not a robust management frame */ | |
450 | ||
451 | mmie = (struct ieee80211_mmie *) | |
452 | (skb->data + skb->len - sizeof(*mmie)); | |
453 | if (mmie->element_id != WLAN_EID_MMIE || | |
454 | mmie->length != sizeof(*mmie) - 2) | |
455 | return -1; | |
456 | ||
457 | return le16_to_cpu(mmie->key_id); | |
458 | } | |
459 | ||
460 | ||
33b64eb2 | 461 | static ieee80211_rx_result |
5cf121c3 | 462 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 463 | { |
a7767f95 HH |
464 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
465 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 466 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 467 | |
a7767f95 | 468 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
469 | if (is_multicast_ether_addr(hdr->addr1)) { |
470 | if (ieee80211_has_tods(hdr->frame_control) || | |
471 | !ieee80211_has_fromds(hdr->frame_control)) | |
472 | return RX_DROP_MONITOR; | |
473 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
474 | return RX_DROP_MONITOR; | |
475 | } else { | |
476 | if (!ieee80211_has_a4(hdr->frame_control)) | |
477 | return RX_DROP_MONITOR; | |
478 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
479 | return RX_DROP_MONITOR; | |
480 | } | |
33b64eb2 LCC |
481 | } |
482 | ||
483 | /* If there is not an established peer link and this is not a peer link | |
484 | * establisment frame, beacon or probe, drop the frame. | |
485 | */ | |
486 | ||
b4e08ea1 | 487 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 488 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 489 | |
a7767f95 | 490 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
491 | return RX_DROP_MONITOR; |
492 | ||
a7767f95 | 493 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 494 | mgmt = (struct ieee80211_mgmt *)hdr; |
0938393f | 495 | if (mgmt->u.action.category != MESH_PLINK_CATEGORY) |
33b64eb2 | 496 | return RX_DROP_MONITOR; |
33b64eb2 | 497 | return RX_CONTINUE; |
33b64eb2 LCC |
498 | } |
499 | ||
a7767f95 HH |
500 | if (ieee80211_is_probe_req(hdr->frame_control) || |
501 | ieee80211_is_probe_resp(hdr->frame_control) || | |
502 | ieee80211_is_beacon(hdr->frame_control)) | |
503 | return RX_CONTINUE; | |
504 | ||
505 | return RX_DROP_MONITOR; | |
506 | ||
507 | } | |
508 | ||
509 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
510 | ||
511 | if (ieee80211_is_data(hdr->frame_control) && | |
512 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 513 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 514 | return RX_DROP_MONITOR; |
902acc78 | 515 | #undef msh_h_get |
d6d1a5a7 | 516 | |
902acc78 JB |
517 | return RX_CONTINUE; |
518 | } | |
33b64eb2 | 519 | |
1edfb1af JB |
520 | #define SEQ_MODULO 0x1000 |
521 | #define SEQ_MASK 0xfff | |
522 | ||
523 | static inline int seq_less(u16 sq1, u16 sq2) | |
524 | { | |
525 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
526 | } | |
527 | ||
528 | static inline u16 seq_inc(u16 sq) | |
529 | { | |
530 | return (sq + 1) & SEQ_MASK; | |
531 | } | |
532 | ||
533 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
534 | { | |
535 | return (sq1 - sq2) & SEQ_MASK; | |
536 | } | |
537 | ||
538 | ||
539 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
540 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
541 | int index, |
542 | struct sk_buff_head *frames) | |
1edfb1af JB |
543 | { |
544 | struct ieee80211_supported_band *sband; | |
545 | struct ieee80211_rate *rate = NULL; | |
546 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; | |
547 | struct ieee80211_rx_status *status; | |
548 | ||
549 | if (!skb) | |
550 | goto no_frame; | |
551 | ||
552 | status = IEEE80211_SKB_RXCB(skb); | |
553 | ||
554 | /* release the reordered frames to stack */ | |
555 | sband = hw->wiphy->bands[status->band]; | |
556 | if (!(status->flag & RX_FLAG_HT)) | |
557 | rate = &sband->bitrates[status->rate_idx]; | |
1edfb1af JB |
558 | tid_agg_rx->stored_mpdu_num--; |
559 | tid_agg_rx->reorder_buf[index] = NULL; | |
d29cecda | 560 | __skb_queue_tail(frames, skb); |
1edfb1af JB |
561 | |
562 | no_frame: | |
563 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
564 | } | |
565 | ||
566 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
567 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
568 | u16 head_seq_num, |
569 | struct sk_buff_head *frames) | |
1edfb1af JB |
570 | { |
571 | int index; | |
572 | ||
573 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
574 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
575 | tid_agg_rx->buf_size; | |
2569a826 | 576 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
577 | } |
578 | } | |
579 | ||
580 | /* | |
581 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
582 | * the skb was added to the buffer longer than this time ago, the earlier | |
583 | * frames that have not yet been received are assumed to be lost and the skb | |
584 | * can be released for processing. This may also release other skb's from the | |
585 | * reorder buffer if there are no additional gaps between the frames. | |
586 | */ | |
587 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
588 | ||
589 | /* | |
590 | * As this function belongs to the RX path it must be under | |
591 | * rcu_read_lock protection. It returns false if the frame | |
592 | * can be processed immediately, true if it was consumed. | |
593 | */ | |
594 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
595 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
596 | struct sk_buff *skb, |
597 | struct sk_buff_head *frames) | |
1edfb1af JB |
598 | { |
599 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
600 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
601 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
602 | u16 head_seq_num, buf_size; | |
603 | int index; | |
604 | ||
605 | buf_size = tid_agg_rx->buf_size; | |
606 | head_seq_num = tid_agg_rx->head_seq_num; | |
607 | ||
608 | /* frame with out of date sequence number */ | |
609 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
610 | dev_kfree_skb(skb); | |
611 | return true; | |
612 | } | |
613 | ||
614 | /* | |
615 | * If frame the sequence number exceeds our buffering window | |
616 | * size release some previous frames to make room for this one. | |
617 | */ | |
618 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
619 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
620 | /* release stored frames up to new head to stack */ | |
2569a826 JB |
621 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
622 | frames); | |
1edfb1af JB |
623 | } |
624 | ||
625 | /* Now the new frame is always in the range of the reordering buffer */ | |
626 | ||
627 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
628 | ||
629 | /* check if we already stored this frame */ | |
630 | if (tid_agg_rx->reorder_buf[index]) { | |
631 | dev_kfree_skb(skb); | |
632 | return true; | |
633 | } | |
634 | ||
635 | /* | |
636 | * If the current MPDU is in the right order and nothing else | |
637 | * is stored we can process it directly, no need to buffer it. | |
638 | */ | |
639 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
640 | tid_agg_rx->stored_mpdu_num == 0) { | |
641 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
642 | return false; | |
643 | } | |
644 | ||
645 | /* put the frame in the reordering buffer */ | |
646 | tid_agg_rx->reorder_buf[index] = skb; | |
647 | tid_agg_rx->reorder_time[index] = jiffies; | |
648 | tid_agg_rx->stored_mpdu_num++; | |
649 | /* release the buffer until next missing frame */ | |
650 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
651 | tid_agg_rx->buf_size; | |
652 | if (!tid_agg_rx->reorder_buf[index] && | |
653 | tid_agg_rx->stored_mpdu_num > 1) { | |
654 | /* | |
655 | * No buffers ready to be released, but check whether any | |
656 | * frames in the reorder buffer have timed out. | |
657 | */ | |
658 | int j; | |
659 | int skipped = 1; | |
660 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
661 | j = (j + 1) % tid_agg_rx->buf_size) { | |
662 | if (!tid_agg_rx->reorder_buf[j]) { | |
663 | skipped++; | |
664 | continue; | |
665 | } | |
666 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
667 | HT_RX_REORDER_BUF_TIMEOUT)) | |
668 | break; | |
669 | ||
670 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
671 | if (net_ratelimit()) | |
672 | printk(KERN_DEBUG "%s: release an RX reorder " | |
673 | "frame due to timeout on earlier " | |
674 | "frames\n", | |
675 | wiphy_name(hw->wiphy)); | |
676 | #endif | |
2569a826 JB |
677 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
678 | j, frames); | |
1edfb1af JB |
679 | |
680 | /* | |
681 | * Increment the head seq# also for the skipped slots. | |
682 | */ | |
683 | tid_agg_rx->head_seq_num = | |
684 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
685 | skipped = 0; | |
686 | } | |
687 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2569a826 | 688 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
689 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
690 | tid_agg_rx->buf_size; | |
691 | } | |
692 | ||
693 | return true; | |
694 | } | |
695 | ||
696 | /* | |
697 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
698 | * true if the MPDU was buffered, false if it should be processed. | |
699 | */ | |
2569a826 JB |
700 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
701 | struct sk_buff_head *frames) | |
1edfb1af | 702 | { |
2569a826 JB |
703 | struct sk_buff *skb = rx->skb; |
704 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
705 | struct ieee80211_hw *hw = &local->hw; |
706 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 707 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
708 | struct tid_ampdu_rx *tid_agg_rx; |
709 | u16 sc; | |
710 | int tid; | |
711 | ||
712 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 713 | goto dont_reorder; |
1edfb1af JB |
714 | |
715 | /* | |
716 | * filter the QoS data rx stream according to | |
717 | * STA/TID and check if this STA/TID is on aggregation | |
718 | */ | |
719 | ||
1edfb1af | 720 | if (!sta) |
2569a826 | 721 | goto dont_reorder; |
1edfb1af JB |
722 | |
723 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
724 | ||
725 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) | |
2569a826 | 726 | goto dont_reorder; |
1edfb1af JB |
727 | |
728 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
729 | ||
730 | /* qos null data frames are excluded */ | |
731 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
2569a826 | 732 | goto dont_reorder; |
1edfb1af JB |
733 | |
734 | /* new, potentially un-ordered, ampdu frame - process it */ | |
735 | ||
736 | /* reset session timer */ | |
737 | if (tid_agg_rx->timeout) | |
738 | mod_timer(&tid_agg_rx->session_timer, | |
739 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
740 | ||
741 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
742 | sc = le16_to_cpu(hdr->seq_ctrl); | |
743 | if (sc & IEEE80211_SCTL_FRAG) { | |
744 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
745 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); | |
746 | dev_kfree_skb(skb); | |
2569a826 | 747 | return; |
1edfb1af JB |
748 | } |
749 | ||
2569a826 JB |
750 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) |
751 | return; | |
752 | ||
753 | dont_reorder: | |
754 | __skb_queue_tail(frames, skb); | |
1edfb1af | 755 | } |
33b64eb2 | 756 | |
49461622 | 757 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 758 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 759 | { |
a7767f95 | 760 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
761 | |
762 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
763 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 764 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 765 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 766 | hdr->seq_ctrl)) { |
5cf121c3 | 767 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
768 | rx->local->dot11FrameDuplicateCount++; |
769 | rx->sta->num_duplicates++; | |
770 | } | |
e4c26add | 771 | return RX_DROP_MONITOR; |
571ecf67 | 772 | } else |
5cf121c3 | 773 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
774 | } |
775 | ||
571ecf67 JB |
776 | if (unlikely(rx->skb->len < 16)) { |
777 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 778 | return RX_DROP_MONITOR; |
571ecf67 JB |
779 | } |
780 | ||
571ecf67 JB |
781 | /* Drop disallowed frame classes based on STA auth/assoc state; |
782 | * IEEE 802.11, Chap 5.5. | |
783 | * | |
ccd7b362 JB |
784 | * mac80211 filters only based on association state, i.e. it drops |
785 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
786 | * deauth/disassoc frames when needed. In addition, hostapd is |
787 | * responsible for filtering on both auth and assoc states. | |
788 | */ | |
33b64eb2 | 789 | |
902acc78 | 790 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 791 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 792 | |
a7767f95 HH |
793 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
794 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 795 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 796 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
797 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
798 | !ieee80211_has_tods(hdr->frame_control) && | |
799 | ieee80211_is_data(hdr->frame_control)) || | |
800 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
801 | /* Drop IBSS frames and frames for other hosts |
802 | * silently. */ | |
e4c26add | 803 | return RX_DROP_MONITOR; |
571ecf67 JB |
804 | } |
805 | ||
e4c26add | 806 | return RX_DROP_MONITOR; |
571ecf67 JB |
807 | } |
808 | ||
9ae54c84 | 809 | return RX_CONTINUE; |
570bd537 JB |
810 | } |
811 | ||
812 | ||
49461622 | 813 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 814 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 815 | { |
eb9fb5b8 JB |
816 | struct sk_buff *skb = rx->skb; |
817 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
818 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
819 | int keyidx; |
820 | int hdrlen; | |
e4c26add | 821 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 822 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 823 | int mmie_keyidx = -1; |
570bd537 | 824 | |
3017b80b JB |
825 | /* |
826 | * Key selection 101 | |
827 | * | |
3cfcf6ac | 828 | * There are four types of keys: |
3017b80b | 829 | * - GTK (group keys) |
3cfcf6ac | 830 | * - IGTK (group keys for management frames) |
3017b80b JB |
831 | * - PTK (pairwise keys) |
832 | * - STK (station-to-station pairwise keys) | |
833 | * | |
834 | * When selecting a key, we have to distinguish between multicast | |
835 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
836 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
837 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
838 | * unicast frames can also use key indices like GTKs. Hence, if we | |
839 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 840 | * |
8dc06a1c JB |
841 | * Note that in a regular BSS, multicast frames are sent by the |
842 | * AP only, associated stations unicast the frame to the AP first | |
843 | * which then multicasts it on their behalf. | |
844 | * | |
3017b80b JB |
845 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
846 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
847 | * The spec seems to expect that one negotiates the same key with |
848 | * every station but there's no such requirement; VLANs could be | |
849 | * possible. | |
3017b80b JB |
850 | */ |
851 | ||
3017b80b | 852 | /* |
1990af8d | 853 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
854 | * addressed to us nor a multicast frame. |
855 | */ | |
5cf121c3 | 856 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 857 | return RX_CONTINUE; |
3017b80b | 858 | |
2569a826 JB |
859 | /* start without a key */ |
860 | rx->key = NULL; | |
861 | ||
d4e46a3d JB |
862 | if (rx->sta) |
863 | stakey = rcu_dereference(rx->sta->key); | |
864 | ||
0c7c10c7 JM |
865 | if (!ieee80211_has_protected(hdr->frame_control)) |
866 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
867 | ||
d4e46a3d JB |
868 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
869 | rx->key = stakey; | |
0c7c10c7 JM |
870 | /* Skip decryption if the frame is not protected. */ |
871 | if (!ieee80211_has_protected(hdr->frame_control)) | |
872 | return RX_CONTINUE; | |
3cfcf6ac JM |
873 | } else if (mmie_keyidx >= 0) { |
874 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
875 | if ((status->flag & RX_FLAG_DECRYPTED) && |
876 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
877 | return RX_CONTINUE; |
878 | ||
879 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
880 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
881 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
882 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
883 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
884 | /* | |
885 | * The frame was not protected, so skip decryption. However, we | |
886 | * need to set rx->key if there is a key that could have been | |
887 | * used so that the frame may be dropped if encryption would | |
888 | * have been expected. | |
889 | */ | |
890 | struct ieee80211_key *key = NULL; | |
891 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
892 | is_multicast_ether_addr(hdr->addr1) && | |
893 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
894 | rx->key = key; | |
895 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
896 | rx->key = key; | |
897 | return RX_CONTINUE; | |
571ecf67 | 898 | } else { |
3017b80b JB |
899 | /* |
900 | * The device doesn't give us the IV so we won't be | |
901 | * able to look up the key. That's ok though, we | |
902 | * don't need to decrypt the frame, we just won't | |
903 | * be able to keep statistics accurate. | |
904 | * Except for key threshold notifications, should | |
905 | * we somehow allow the driver to tell us which key | |
906 | * the hardware used if this flag is set? | |
907 | */ | |
eb9fb5b8 JB |
908 | if ((status->flag & RX_FLAG_DECRYPTED) && |
909 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 910 | return RX_CONTINUE; |
3017b80b | 911 | |
a7767f95 | 912 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
913 | |
914 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 915 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
916 | |
917 | /* | |
918 | * no need to call ieee80211_wep_get_keyidx, | |
919 | * it verifies a bunch of things we've done already | |
920 | */ | |
921 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
922 | ||
d4e46a3d | 923 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
924 | |
925 | /* | |
926 | * RSNA-protected unicast frames should always be sent with | |
927 | * pairwise or station-to-station keys, but for WEP we allow | |
928 | * using a key index as well. | |
929 | */ | |
8f20fc24 | 930 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
931 | !is_multicast_ether_addr(hdr->addr1)) |
932 | rx->key = NULL; | |
571ecf67 JB |
933 | } |
934 | ||
3017b80b | 935 | if (rx->key) { |
571ecf67 | 936 | rx->key->tx_rx_count++; |
011bfcc4 | 937 | /* TODO: add threshold stuff again */ |
1990af8d | 938 | } else { |
e4c26add | 939 | return RX_DROP_MONITOR; |
70f08765 JB |
940 | } |
941 | ||
1990af8d JB |
942 | /* Check for weak IVs if possible */ |
943 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 944 | ieee80211_is_data(hdr->frame_control) && |
eb9fb5b8 JB |
945 | (!(status->flag & RX_FLAG_IV_STRIPPED) || |
946 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
947 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
948 | rx->sta->wep_weak_iv_count++; | |
949 | ||
70f08765 JB |
950 | switch (rx->key->conf.alg) { |
951 | case ALG_WEP: | |
e2f036da MN |
952 | result = ieee80211_crypto_wep_decrypt(rx); |
953 | break; | |
70f08765 | 954 | case ALG_TKIP: |
e2f036da MN |
955 | result = ieee80211_crypto_tkip_decrypt(rx); |
956 | break; | |
70f08765 | 957 | case ALG_CCMP: |
e2f036da MN |
958 | result = ieee80211_crypto_ccmp_decrypt(rx); |
959 | break; | |
3cfcf6ac JM |
960 | case ALG_AES_CMAC: |
961 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
962 | break; | |
70f08765 JB |
963 | } |
964 | ||
e2f036da | 965 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 966 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
967 | |
968 | return result; | |
70f08765 JB |
969 | } |
970 | ||
572e0012 KV |
971 | static ieee80211_rx_result debug_noinline |
972 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
973 | { | |
974 | struct ieee80211_local *local; | |
975 | struct ieee80211_hdr *hdr; | |
976 | struct sk_buff *skb; | |
977 | ||
978 | local = rx->local; | |
979 | skb = rx->skb; | |
980 | hdr = (struct ieee80211_hdr *) skb->data; | |
981 | ||
982 | if (!local->pspolling) | |
983 | return RX_CONTINUE; | |
984 | ||
985 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
986 | /* this is not from AP */ | |
987 | return RX_CONTINUE; | |
988 | ||
989 | if (!ieee80211_is_data(hdr->frame_control)) | |
990 | return RX_CONTINUE; | |
991 | ||
992 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
993 | /* AP has no more frames buffered for us */ | |
994 | local->pspolling = false; | |
995 | return RX_CONTINUE; | |
996 | } | |
997 | ||
998 | /* more data bit is set, let's request a new frame from the AP */ | |
999 | ieee80211_send_pspoll(local, rx->sdata); | |
1000 | ||
1001 | return RX_CONTINUE; | |
1002 | } | |
1003 | ||
133b8226 | 1004 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1005 | { |
133b8226 | 1006 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1007 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1008 | |
3e122be0 | 1009 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1010 | set_sta_flags(sta, WLAN_STA_PS_STA); |
12375ef9 | 1011 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1012 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1013 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1014 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1015 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1016 | } | |
1017 | ||
ff9458d3 | 1018 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1019 | { |
133b8226 | 1020 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1021 | |
3e122be0 | 1022 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1023 | |
af818581 | 1024 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
004c872e | 1025 | |
571ecf67 | 1026 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1027 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1028 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1029 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1030 | |
af818581 | 1031 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1032 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1033 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1034 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1035 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1036 | return; |
1037 | } | |
1038 | ||
1039 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1040 | } |
1041 | ||
49461622 | 1042 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1043 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1044 | { |
1045 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1046 | struct sk_buff *skb = rx->skb; |
1047 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1048 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1049 | |
1050 | if (!sta) | |
9ae54c84 | 1051 | return RX_CONTINUE; |
571ecf67 | 1052 | |
b291ba11 JB |
1053 | /* |
1054 | * Update last_rx only for IBSS packets which are for the current | |
1055 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1056 | * where other STAs start using different BSSID. | |
1057 | */ | |
05c914fe | 1058 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1059 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1060 | NL80211_IFTYPE_ADHOC); |
46900298 | 1061 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1062 | sta->last_rx = jiffies; |
b291ba11 JB |
1063 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1064 | /* | |
33b64eb2 LCC |
1065 | * Mesh beacons will update last_rx when if they are found to |
1066 | * match the current local configuration when processed. | |
571ecf67 | 1067 | */ |
b291ba11 | 1068 | sta->last_rx = jiffies; |
571ecf67 JB |
1069 | } |
1070 | ||
5cf121c3 | 1071 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1072 | return RX_CONTINUE; |
571ecf67 | 1073 | |
3cf335d5 KV |
1074 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1075 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1076 | ||
571ecf67 JB |
1077 | sta->rx_fragments++; |
1078 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 JB |
1079 | sta->last_signal = status->signal; |
1080 | sta->last_noise = status->noise; | |
571ecf67 | 1081 | |
72eaa43a JB |
1082 | /* |
1083 | * Change STA power saving mode only at the end of a frame | |
1084 | * exchange sequence. | |
1085 | */ | |
3e122be0 | 1086 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
1087 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
1088 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 1089 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
1090 | /* |
1091 | * Ignore doze->wake transitions that are | |
1092 | * indicated by non-data frames, the standard | |
1093 | * is unclear here, but for example going to | |
1094 | * PS mode and then scanning would cause a | |
1095 | * doze->wake transition for the probe request, | |
1096 | * and that is clearly undesirable. | |
1097 | */ | |
1098 | if (ieee80211_is_data(hdr->frame_control) && | |
1099 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 1100 | ap_sta_ps_end(sta); |
72eaa43a JB |
1101 | } else { |
1102 | if (ieee80211_has_pm(hdr->frame_control)) | |
1103 | ap_sta_ps_start(sta); | |
1104 | } | |
571ecf67 JB |
1105 | } |
1106 | ||
22403def JB |
1107 | /* |
1108 | * Drop (qos-)data::nullfunc frames silently, since they | |
1109 | * are used only to control station power saving mode. | |
1110 | */ | |
1111 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
1112 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 1113 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
d524215f FF |
1114 | |
1115 | /* | |
1116 | * If we receive a 4-addr nullfunc frame from a STA | |
1117 | * that was not moved to a 4-addr STA vlan yet, drop | |
1118 | * the frame to the monitor interface, to make sure | |
1119 | * that hostapd sees it | |
1120 | */ | |
1121 | if (ieee80211_has_a4(hdr->frame_control) && | |
1122 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || | |
1123 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1124 | !rx->sdata->u.vlan.sta))) | |
1125 | return RX_DROP_MONITOR; | |
22403def JB |
1126 | /* |
1127 | * Update counter and free packet here to avoid | |
1128 | * counting this as a dropped packed. | |
1129 | */ | |
571ecf67 JB |
1130 | sta->rx_packets++; |
1131 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 1132 | return RX_QUEUED; |
571ecf67 JB |
1133 | } |
1134 | ||
9ae54c84 | 1135 | return RX_CONTINUE; |
571ecf67 JB |
1136 | } /* ieee80211_rx_h_sta_process */ |
1137 | ||
571ecf67 JB |
1138 | static inline struct ieee80211_fragment_entry * |
1139 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
1140 | unsigned int frag, unsigned int seq, int rx_queue, | |
1141 | struct sk_buff **skb) | |
1142 | { | |
1143 | struct ieee80211_fragment_entry *entry; | |
1144 | int idx; | |
1145 | ||
1146 | idx = sdata->fragment_next; | |
1147 | entry = &sdata->fragments[sdata->fragment_next++]; | |
1148 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
1149 | sdata->fragment_next = 0; | |
1150 | ||
1151 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 1152 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
1153 | struct ieee80211_hdr *hdr = |
1154 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
1155 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
1156 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 1157 | "addr1=%pM addr2=%pM\n", |
47846c9b | 1158 | sdata->name, idx, |
571ecf67 | 1159 | jiffies - entry->first_frag_time, entry->seq, |
0c68ae26 | 1160 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 1161 | #endif |
571ecf67 JB |
1162 | __skb_queue_purge(&entry->skb_list); |
1163 | } | |
1164 | ||
1165 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
1166 | *skb = NULL; | |
1167 | entry->first_frag_time = jiffies; | |
1168 | entry->seq = seq; | |
1169 | entry->rx_queue = rx_queue; | |
1170 | entry->last_frag = frag; | |
1171 | entry->ccmp = 0; | |
1172 | entry->extra_len = 0; | |
1173 | ||
1174 | return entry; | |
1175 | } | |
1176 | ||
1177 | static inline struct ieee80211_fragment_entry * | |
1178 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 1179 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
1180 | int rx_queue, struct ieee80211_hdr *hdr) |
1181 | { | |
1182 | struct ieee80211_fragment_entry *entry; | |
1183 | int i, idx; | |
1184 | ||
1185 | idx = sdata->fragment_next; | |
1186 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
1187 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
1188 | |
1189 | idx--; | |
1190 | if (idx < 0) | |
1191 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
1192 | ||
1193 | entry = &sdata->fragments[idx]; | |
1194 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
1195 | entry->rx_queue != rx_queue || | |
1196 | entry->last_frag + 1 != frag) | |
1197 | continue; | |
1198 | ||
b73d70ad | 1199 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 1200 | |
b73d70ad HH |
1201 | /* |
1202 | * Check ftype and addresses are equal, else check next fragment | |
1203 | */ | |
1204 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
1205 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
1206 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
1207 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
1208 | continue; | |
1209 | ||
ab46623e | 1210 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
1211 | __skb_queue_purge(&entry->skb_list); |
1212 | continue; | |
1213 | } | |
1214 | return entry; | |
1215 | } | |
1216 | ||
1217 | return NULL; | |
1218 | } | |
1219 | ||
49461622 | 1220 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1221 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1222 | { |
1223 | struct ieee80211_hdr *hdr; | |
1224 | u16 sc; | |
358c8d9d | 1225 | __le16 fc; |
571ecf67 JB |
1226 | unsigned int frag, seq; |
1227 | struct ieee80211_fragment_entry *entry; | |
1228 | struct sk_buff *skb; | |
1229 | ||
b73d70ad | 1230 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1231 | fc = hdr->frame_control; |
571ecf67 JB |
1232 | sc = le16_to_cpu(hdr->seq_ctrl); |
1233 | frag = sc & IEEE80211_SCTL_FRAG; | |
1234 | ||
358c8d9d | 1235 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1236 | (rx->skb)->len < 24 || |
1237 | is_multicast_ether_addr(hdr->addr1))) { | |
1238 | /* not fragmented */ | |
1239 | goto out; | |
1240 | } | |
1241 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1242 | ||
1243 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1244 | ||
1245 | if (frag == 0) { | |
1246 | /* This is the first fragment of a new frame. */ | |
1247 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1248 | rx->queue, &(rx->skb)); |
8f20fc24 | 1249 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1250 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1251 | /* Store CCMP PN so that we can verify that the next |
1252 | * fragment has a sequential PN value. */ | |
1253 | entry->ccmp = 1; | |
1254 | memcpy(entry->last_pn, | |
5cf121c3 | 1255 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1256 | CCMP_PN_LEN); |
1257 | } | |
9ae54c84 | 1258 | return RX_QUEUED; |
571ecf67 JB |
1259 | } |
1260 | ||
1261 | /* This is a fragment for a frame that should already be pending in | |
1262 | * fragment cache. Add this fragment to the end of the pending entry. | |
1263 | */ | |
b73d70ad | 1264 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1265 | if (!entry) { |
1266 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1267 | return RX_DROP_MONITOR; |
571ecf67 JB |
1268 | } |
1269 | ||
1270 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1271 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1272 | if (entry->ccmp) { | |
1273 | int i; | |
1274 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1275 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1276 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1277 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1278 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1279 | pn[i]++; | |
1280 | if (pn[i]) | |
1281 | break; | |
1282 | } | |
5cf121c3 | 1283 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1284 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1285 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1286 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1287 | } | |
1288 | ||
358c8d9d | 1289 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1290 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1291 | entry->last_frag = frag; | |
1292 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1293 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1294 | rx->skb = NULL; |
9ae54c84 | 1295 | return RX_QUEUED; |
571ecf67 JB |
1296 | } |
1297 | ||
1298 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1299 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1300 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1301 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1302 | GFP_ATOMIC))) { | |
1303 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1304 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1305 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1306 | } |
1307 | } | |
1308 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1309 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1310 | dev_kfree_skb(skb); | |
1311 | } | |
1312 | ||
1313 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1314 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1315 | |
1316 | out: | |
1317 | if (rx->sta) | |
1318 | rx->sta->rx_packets++; | |
1319 | if (is_multicast_ether_addr(hdr->addr1)) | |
1320 | rx->local->dot11MulticastReceivedFrameCount++; | |
1321 | else | |
1322 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1323 | return RX_CONTINUE; |
571ecf67 JB |
1324 | } |
1325 | ||
49461622 | 1326 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1327 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1328 | { |
af818581 | 1329 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1330 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1331 | |
358c8d9d | 1332 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1333 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1334 | return RX_CONTINUE; |
571ecf67 | 1335 | |
05c914fe JB |
1336 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1337 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1338 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1339 | |
af818581 JB |
1340 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1341 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1342 | else | |
1343 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1344 | |
9ae54c84 | 1345 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1346 | * count as an dropped frame. */ |
1347 | dev_kfree_skb(rx->skb); | |
1348 | ||
9ae54c84 | 1349 | return RX_QUEUED; |
571ecf67 JB |
1350 | } |
1351 | ||
49461622 | 1352 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1353 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1354 | { |
6e0d114d | 1355 | u8 *data = rx->skb->data; |
238f74a2 | 1356 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1357 | |
238f74a2 | 1358 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1359 | return RX_CONTINUE; |
6e0d114d JB |
1360 | |
1361 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1362 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1363 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1364 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1365 | /* change frame type to non QOS */ |
238f74a2 | 1366 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1367 | |
9ae54c84 | 1368 | return RX_CONTINUE; |
6e0d114d JB |
1369 | } |
1370 | ||
76ee65bf | 1371 | static int |
5cf121c3 | 1372 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1373 | { |
07346f81 | 1374 | if (unlikely(!rx->sta || |
f4ea83dd | 1375 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1376 | return -EACCES; |
571ecf67 | 1377 | |
76ee65bf | 1378 | return 0; |
571ecf67 JB |
1379 | } |
1380 | ||
76ee65bf | 1381 | static int |
358c8d9d | 1382 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1383 | { |
eb9fb5b8 JB |
1384 | struct sk_buff *skb = rx->skb; |
1385 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1386 | ||
3017b80b | 1387 | /* |
7848ba7d JB |
1388 | * Pass through unencrypted frames if the hardware has |
1389 | * decrypted them already. | |
3017b80b | 1390 | */ |
eb9fb5b8 | 1391 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1392 | return 0; |
571ecf67 JB |
1393 | |
1394 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1395 | if (unlikely(!ieee80211_has_protected(fc) && |
1396 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1397 | ieee80211_is_data(fc) && |
b3fc9c6c | 1398 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1399 | return -EACCES; |
f2ca3ea4 JM |
1400 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1401 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1402 | rx->key)) | |
1403 | return -EACCES; | |
1404 | /* BIP does not use Protected field, so need to check MMIE */ | |
f64f9e71 JP |
1405 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
1406 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
f2ca3ea4 JM |
1407 | rx->key)) |
1408 | return -EACCES; | |
1409 | /* | |
1410 | * When using MFP, Action frames are not allowed prior to | |
1411 | * having configured keys. | |
1412 | */ | |
1413 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1414 | ieee80211_is_robust_mgmt_frame( | |
1415 | (struct ieee80211_hdr *) rx->skb->data))) | |
1416 | return -EACCES; | |
1417 | } | |
b3fc9c6c | 1418 | |
76ee65bf | 1419 | return 0; |
571ecf67 JB |
1420 | } |
1421 | ||
76ee65bf | 1422 | static int |
e31a16d6 | 1423 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1424 | { |
eb9fb5b8 | 1425 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee FF |
1426 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1427 | ||
9bc383de JB |
1428 | if (ieee80211_has_a4(hdr->frame_control) && |
1429 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1430 | return -1; |
9bc383de JB |
1431 | |
1432 | if (is_multicast_ether_addr(hdr->addr1) && | |
1433 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1434 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1435 | return -1; |
571ecf67 | 1436 | |
47846c9b | 1437 | return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
76ee65bf | 1438 | } |
571ecf67 | 1439 | |
ce3edf6d JB |
1440 | /* |
1441 | * requires that rx->skb is a frame with ethernet header | |
1442 | */ | |
358c8d9d | 1443 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1444 | { |
c97c23e3 | 1445 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1446 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1447 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1448 | ||
1449 | /* | |
1450 | * Allow EAPOL frames to us/the PAE group address regardless | |
1451 | * of whether the frame was encrypted or not. | |
1452 | */ | |
1453 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
47846c9b | 1454 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1455 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1456 | return true; | |
1457 | ||
1458 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1459 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1460 | return false; |
1461 | ||
1462 | return true; | |
1463 | } | |
1464 | ||
1465 | /* | |
1466 | * requires that rx->skb is a frame with ethernet header | |
1467 | */ | |
76ee65bf | 1468 | static void |
5cf121c3 | 1469 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1470 | { |
eb9fb5b8 JB |
1471 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1472 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1473 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1474 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1475 | struct sta_info *dsta; | |
571ecf67 | 1476 | |
76ee65bf RR |
1477 | skb = rx->skb; |
1478 | xmit_skb = NULL; | |
571ecf67 | 1479 | |
05c914fe JB |
1480 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1481 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1482 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
9bc383de JB |
1483 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
1484 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
ce3edf6d JB |
1485 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1486 | /* | |
1487 | * send multicast frames both to higher layers in | |
1488 | * local net stack and back to the wireless medium | |
1489 | */ | |
76ee65bf RR |
1490 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1491 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1492 | printk(KERN_DEBUG "%s: failed to clone " |
1493 | "multicast frame\n", dev->name); | |
1494 | } else { | |
abe60632 JB |
1495 | dsta = sta_info_get(sdata, skb->data); |
1496 | if (dsta) { | |
ce3edf6d JB |
1497 | /* |
1498 | * The destination station is associated to | |
1499 | * this AP (in this VLAN), so send the frame | |
1500 | * directly to it and do not pass it to local | |
1501 | * net stack. | |
571ecf67 | 1502 | */ |
76ee65bf | 1503 | xmit_skb = skb; |
571ecf67 JB |
1504 | skb = NULL; |
1505 | } | |
571ecf67 JB |
1506 | } |
1507 | } | |
1508 | ||
1509 | if (skb) { | |
d1c3a37c JB |
1510 | int align __maybe_unused; |
1511 | ||
59d9cb07 | 1512 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1513 | /* |
1514 | * 'align' will only take the values 0 or 2 here | |
1515 | * since all frames are required to be aligned | |
1516 | * to 2-byte boundaries when being passed to | |
1517 | * mac80211. That also explains the __skb_push() | |
1518 | * below. | |
1519 | */ | |
dacb6f1d | 1520 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1521 | if (align) { |
1522 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1523 | dev_kfree_skb(skb); | |
1524 | skb = NULL; | |
1525 | } else { | |
1526 | u8 *data = skb->data; | |
8ce0b589 ZY |
1527 | size_t len = skb_headlen(skb); |
1528 | skb->data -= align; | |
1529 | memmove(skb->data, data, len); | |
1530 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1531 | } |
1532 | } | |
1533 | #endif | |
1534 | ||
1535 | if (skb) { | |
1536 | /* deliver to local stack */ | |
1537 | skb->protocol = eth_type_trans(skb, dev); | |
1538 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1539 | netif_rx(skb); | |
1540 | } | |
571ecf67 JB |
1541 | } |
1542 | ||
76ee65bf | 1543 | if (xmit_skb) { |
571ecf67 | 1544 | /* send to wireless media */ |
f831e909 | 1545 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1546 | skb_reset_network_header(xmit_skb); |
1547 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1548 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1549 | } |
76ee65bf RR |
1550 | } |
1551 | ||
49461622 | 1552 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1553 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1554 | { |
eb9fb5b8 | 1555 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1556 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1557 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1558 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1559 | struct sk_buff_head frame_list; |
fd4c7f2f | 1560 | |
358c8d9d | 1561 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1562 | return RX_CONTINUE; |
fd4c7f2f | 1563 | |
358c8d9d | 1564 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1565 | return RX_DROP_MONITOR; |
fd4c7f2f | 1566 | |
5cf121c3 | 1567 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1568 | return RX_CONTINUE; |
fd4c7f2f | 1569 | |
eaf85ca7 ZY |
1570 | if (ieee80211_has_a4(hdr->frame_control) && |
1571 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1572 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1573 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1574 | |
eaf85ca7 ZY |
1575 | if (is_multicast_ether_addr(hdr->addr1) && |
1576 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1577 | rx->sdata->u.vlan.sta) || | |
1578 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1579 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1580 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1581 | |
eaf85ca7 ZY |
1582 | skb->dev = dev; |
1583 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1584 | |
eaf85ca7 ZY |
1585 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1586 | rx->sdata->vif.type, | |
1587 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1588 | |
eaf85ca7 ZY |
1589 | while (!skb_queue_empty(&frame_list)) { |
1590 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1591 | |
358c8d9d | 1592 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1593 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1594 | continue; |
1595 | } | |
eaf85ca7 ZY |
1596 | dev->stats.rx_packets++; |
1597 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1598 | |
1599 | ieee80211_deliver_skb(rx); | |
1600 | } | |
1601 | ||
9ae54c84 | 1602 | return RX_QUEUED; |
fd4c7f2f RR |
1603 | } |
1604 | ||
bf94e17b | 1605 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1606 | static ieee80211_rx_result |
e32f85f7 LCC |
1607 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1608 | { | |
1609 | struct ieee80211_hdr *hdr; | |
1610 | struct ieee80211s_hdr *mesh_hdr; | |
1611 | unsigned int hdrlen; | |
1612 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1613 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1614 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e32f85f7 LCC |
1615 | |
1616 | hdr = (struct ieee80211_hdr *) skb->data; | |
1617 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1618 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1619 | ||
1620 | if (!ieee80211_is_data(hdr->frame_control)) | |
1621 | return RX_CONTINUE; | |
1622 | ||
1623 | if (!mesh_hdr->ttl) | |
1624 | /* illegal frame */ | |
1625 | return RX_DROP_MONITOR; | |
1626 | ||
43b7b314 | 1627 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1628 | struct mesh_path *mppath; |
43b7b314 JC |
1629 | char *proxied_addr; |
1630 | char *mpp_addr; | |
1631 | ||
1632 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1633 | mpp_addr = hdr->addr3; | |
1634 | proxied_addr = mesh_hdr->eaddr1; | |
1635 | } else { | |
1636 | mpp_addr = hdr->addr4; | |
1637 | proxied_addr = mesh_hdr->eaddr2; | |
1638 | } | |
79617dee | 1639 | |
79617dee | 1640 | rcu_read_lock(); |
43b7b314 | 1641 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1642 | if (!mppath) { |
43b7b314 | 1643 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1644 | } else { |
1645 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1646 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1647 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1648 | spin_unlock_bh(&mppath->state_lock); |
1649 | } | |
1650 | rcu_read_unlock(); | |
1651 | } | |
1652 | ||
3c5772a5 JC |
1653 | /* Frame has reached destination. Don't forward */ |
1654 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1655 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1656 | return RX_CONTINUE; |
1657 | ||
1658 | mesh_hdr->ttl--; | |
1659 | ||
1660 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1661 | if (!mesh_hdr->ttl) | |
472dbc45 | 1662 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1663 | dropped_frames_ttl); |
1664 | else { | |
1665 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1666 | struct ieee80211_tx_info *info; |
1667 | ||
e32f85f7 LCC |
1668 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1669 | ||
1670 | if (!fwd_skb && net_ratelimit()) | |
1671 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1672 | sdata->name); |
e32f85f7 LCC |
1673 | |
1674 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1675 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1676 | info = IEEE80211_SKB_CB(fwd_skb); |
1677 | memset(info, 0, sizeof(*info)); | |
1678 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1679 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1680 | skb_set_queue_mapping(skb, |
1681 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1682 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1683 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1684 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1685 | fwded_mcast); | |
1686 | else { | |
3c5772a5 JC |
1687 | int err; |
1688 | /* | |
1689 | * Save TA to addr1 to send TA a path error if a | |
1690 | * suitable next hop is not found | |
1691 | */ | |
1692 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1693 | ETH_ALEN); |
3c5772a5 | 1694 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1695 | /* Failed to immediately resolve next hop: |
1696 | * fwded frame was dropped or will be added | |
1697 | * later to the pending skb queue. */ | |
1698 | if (err) | |
1699 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1700 | |
1701 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1702 | fwded_unicast); | |
249b405c JC |
1703 | } |
1704 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1705 | fwded_frames); | |
3b8d81e0 | 1706 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1707 | } |
1708 | } | |
1709 | ||
3c5772a5 | 1710 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1711 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1712 | return RX_CONTINUE; |
1713 | else | |
1714 | return RX_DROP_MONITOR; | |
1715 | } | |
bf94e17b | 1716 | #endif |
e32f85f7 | 1717 | |
49461622 | 1718 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1719 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1720 | { |
eb9fb5b8 | 1721 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1722 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1723 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1724 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1725 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1726 | int err; |
76ee65bf | 1727 | |
358c8d9d | 1728 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1729 | return RX_CONTINUE; |
76ee65bf | 1730 | |
358c8d9d | 1731 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1732 | return RX_DROP_MONITOR; |
76ee65bf | 1733 | |
f14543ee FF |
1734 | /* |
1735 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1736 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1737 | */ | |
1738 | if (ieee80211_has_a4(hdr->frame_control) && | |
1739 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1740 | return RX_DROP_MONITOR; | |
1741 | ||
e31a16d6 | 1742 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1743 | if (unlikely(err)) |
e4c26add | 1744 | return RX_DROP_UNUSABLE; |
76ee65bf | 1745 | |
358c8d9d | 1746 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1747 | return RX_DROP_MONITOR; |
ce3edf6d | 1748 | |
76ee65bf RR |
1749 | rx->skb->dev = dev; |
1750 | ||
1751 | dev->stats.rx_packets++; | |
1752 | dev->stats.rx_bytes += rx->skb->len; | |
1753 | ||
e15276a4 VN |
1754 | if (ieee80211_is_data(hdr->frame_control) && |
1755 | !is_multicast_ether_addr(hdr->addr1) && | |
1756 | local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) { | |
1757 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
1758 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1759 | } | |
1760 | ||
76ee65bf | 1761 | ieee80211_deliver_skb(rx); |
571ecf67 | 1762 | |
9ae54c84 | 1763 | return RX_QUEUED; |
571ecf67 JB |
1764 | } |
1765 | ||
49461622 | 1766 | static ieee80211_rx_result debug_noinline |
2569a826 | 1767 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
71364716 RR |
1768 | { |
1769 | struct ieee80211_local *local = rx->local; | |
1770 | struct ieee80211_hw *hw = &local->hw; | |
1771 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1772 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1773 | struct tid_ampdu_rx *tid_agg_rx; |
1774 | u16 start_seq_num; | |
1775 | u16 tid; | |
1776 | ||
a7767f95 | 1777 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1778 | return RX_CONTINUE; |
71364716 | 1779 | |
a7767f95 | 1780 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1781 | if (!rx->sta) |
a02ae758 | 1782 | return RX_DROP_MONITOR; |
71364716 | 1783 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1784 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1785 | != HT_AGG_STATE_OPERATIONAL) | |
a02ae758 | 1786 | return RX_DROP_MONITOR; |
cee24a3e | 1787 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1788 | |
1789 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1790 | ||
1791 | /* reset session timer */ | |
20ad19d0 JB |
1792 | if (tid_agg_rx->timeout) |
1793 | mod_timer(&tid_agg_rx->session_timer, | |
1794 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1795 | |
a02ae758 | 1796 | /* release stored frames up to start of BAR */ |
2569a826 JB |
1797 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
1798 | frames); | |
a02ae758 JB |
1799 | kfree_skb(skb); |
1800 | return RX_QUEUED; | |
71364716 RR |
1801 | } |
1802 | ||
9ae54c84 | 1803 | return RX_CONTINUE; |
71364716 RR |
1804 | } |
1805 | ||
f4f727a6 JM |
1806 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1807 | struct ieee80211_mgmt *mgmt, | |
1808 | size_t len) | |
fea14732 JM |
1809 | { |
1810 | struct ieee80211_local *local = sdata->local; | |
1811 | struct sk_buff *skb; | |
1812 | struct ieee80211_mgmt *resp; | |
1813 | ||
47846c9b | 1814 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
1815 | /* Not to own unicast address */ |
1816 | return; | |
1817 | } | |
1818 | ||
46900298 JB |
1819 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1820 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1821 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1822 | return; |
1823 | } | |
1824 | ||
1825 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1826 | /* Too short SA Query request frame */ | |
1827 | return; | |
1828 | } | |
1829 | ||
1830 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1831 | if (skb == NULL) | |
1832 | return; | |
1833 | ||
1834 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1835 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1836 | memset(resp, 0, 24); | |
1837 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 1838 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 1839 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1840 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1841 | IEEE80211_STYPE_ACTION); | |
1842 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1843 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1844 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1845 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1846 | mgmt->u.action.u.sa_query.trans_id, | |
1847 | WLAN_SA_QUERY_TR_ID_LEN); | |
1848 | ||
62ae67be | 1849 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
1850 | } |
1851 | ||
de1ede7a JB |
1852 | static ieee80211_rx_result debug_noinline |
1853 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1854 | { | |
1855 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 1856 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a JB |
1857 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
1858 | int len = rx->skb->len; | |
1859 | ||
1860 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1861 | return RX_CONTINUE; | |
1862 | ||
1863 | if (!rx->sta) | |
1864 | return RX_DROP_MONITOR; | |
1865 | ||
1866 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1867 | return RX_DROP_MONITOR; | |
1868 | ||
97ebe12a JM |
1869 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1870 | return RX_DROP_MONITOR; | |
1871 | ||
de1ede7a JB |
1872 | /* all categories we currently handle have action_code */ |
1873 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1874 | return RX_DROP_MONITOR; | |
1875 | ||
de1ede7a JB |
1876 | switch (mgmt->u.action.category) { |
1877 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1878 | /* |
1879 | * The aggregation code is not prepared to handle | |
1880 | * anything but STA/AP due to the BSSID handling; | |
1881 | * IBSS could work in the code but isn't supported | |
1882 | * by drivers or the standard. | |
1883 | */ | |
1884 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1885 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1886 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1887 | return RX_DROP_MONITOR; | |
1888 | ||
de1ede7a JB |
1889 | switch (mgmt->u.action.u.addba_req.action_code) { |
1890 | case WLAN_ACTION_ADDBA_REQ: | |
1891 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1892 | sizeof(mgmt->u.action.u.addba_req))) | |
1893 | return RX_DROP_MONITOR; | |
1894 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1895 | break; | |
1896 | case WLAN_ACTION_ADDBA_RESP: | |
1897 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1898 | sizeof(mgmt->u.action.u.addba_resp))) | |
1899 | return RX_DROP_MONITOR; | |
1900 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1901 | break; | |
1902 | case WLAN_ACTION_DELBA: | |
1903 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1904 | sizeof(mgmt->u.action.u.delba))) | |
1905 | return RX_DROP_MONITOR; | |
1906 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1907 | break; | |
1908 | } | |
39192c0b JB |
1909 | break; |
1910 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1911 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1912 | return RX_DROP_MONITOR; | |
46900298 JB |
1913 | |
1914 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1915 | return RX_DROP_MONITOR; | |
1916 | ||
39192c0b JB |
1917 | switch (mgmt->u.action.u.measurement.action_code) { |
1918 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1919 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1920 | sizeof(mgmt->u.action.u.measurement))) | |
1921 | return RX_DROP_MONITOR; | |
1922 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1923 | break; | |
c481ec97 S |
1924 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1925 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1926 | sizeof(mgmt->u.action.u.chan_switch))) | |
1927 | return RX_DROP_MONITOR; | |
1928 | ||
cc32abd4 JB |
1929 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1930 | return RX_DROP_MONITOR; | |
1931 | ||
46900298 | 1932 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1933 | return RX_DROP_MONITOR; |
1934 | ||
77fdaa12 | 1935 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1936 | } |
1937 | break; | |
fea14732 JM |
1938 | case WLAN_CATEGORY_SA_QUERY: |
1939 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1940 | sizeof(mgmt->u.action.u.sa_query))) | |
1941 | return RX_DROP_MONITOR; | |
1942 | switch (mgmt->u.action.u.sa_query.action) { | |
1943 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1944 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1945 | return RX_DROP_MONITOR; | |
1946 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1947 | break; | |
1948 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1949 | /* | |
1950 | * SA Query response is currently only used in AP mode | |
1951 | * and it is processed in user space. | |
1952 | */ | |
1953 | return RX_CONTINUE; | |
1954 | } | |
1955 | break; | |
39192c0b | 1956 | default: |
d7907448 FF |
1957 | /* do not process rejected action frames */ |
1958 | if (mgmt->u.action.category & 0x80) | |
1959 | return RX_DROP_MONITOR; | |
1960 | ||
39192c0b | 1961 | return RX_CONTINUE; |
de1ede7a JB |
1962 | } |
1963 | ||
39192c0b JB |
1964 | rx->sta->rx_packets++; |
1965 | dev_kfree_skb(rx->skb); | |
1966 | return RX_QUEUED; | |
de1ede7a JB |
1967 | } |
1968 | ||
49461622 | 1969 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1970 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1971 | { |
eb9fb5b8 | 1972 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
97ebe12a | 1973 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
af6b6374 | 1974 | ieee80211_rx_result rxs; |
571ecf67 | 1975 | |
5cf121c3 | 1976 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1977 | return RX_DROP_MONITOR; |
571ecf67 | 1978 | |
97ebe12a JM |
1979 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1980 | return RX_DROP_MONITOR; | |
1981 | ||
af6b6374 JB |
1982 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
1983 | if (rxs != RX_CONTINUE) | |
1984 | return rxs; | |
1985 | ||
472dbc45 | 1986 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 1987 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 1988 | |
3832c287 | 1989 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 1990 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 1991 | |
7986cf95 | 1992 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 1993 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 1994 | |
7986cf95 | 1995 | return RX_DROP_MONITOR; |
571ecf67 JB |
1996 | } |
1997 | ||
3b8d81e0 | 1998 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 1999 | struct ieee80211_rx_data *rx) |
571ecf67 | 2000 | { |
a7767f95 HH |
2001 | int keyidx; |
2002 | unsigned int hdrlen; | |
571ecf67 | 2003 | |
a7767f95 | 2004 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2005 | if (rx->skb->len >= hdrlen + 4) |
2006 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2007 | else | |
2008 | keyidx = -1; | |
2009 | ||
8944b79f | 2010 | if (!rx->sta) { |
aa0daf0e JB |
2011 | /* |
2012 | * Some hardware seem to generate incorrect Michael MIC | |
2013 | * reports; ignore them to avoid triggering countermeasures. | |
2014 | */ | |
af2ced6a | 2015 | return; |
571ecf67 JB |
2016 | } |
2017 | ||
a7767f95 | 2018 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2019 | return; |
571ecf67 | 2020 | |
05c914fe | 2021 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2022 | /* |
2023 | * APs with pairwise keys should never receive Michael MIC | |
2024 | * errors for non-zero keyidx because these are reserved for | |
2025 | * group keys and only the AP is sending real multicast | |
2026 | * frames in the BSS. | |
2027 | */ | |
af2ced6a | 2028 | return; |
571ecf67 JB |
2029 | } |
2030 | ||
a7767f95 HH |
2031 | if (!ieee80211_is_data(hdr->frame_control) && |
2032 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2033 | return; |
571ecf67 | 2034 | |
e6d6e342 JB |
2035 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2036 | GFP_ATOMIC); | |
571ecf67 JB |
2037 | } |
2038 | ||
5cf121c3 | 2039 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2040 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2041 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2042 | { |
2043 | struct ieee80211_sub_if_data *sdata; | |
2044 | struct ieee80211_local *local = rx->local; | |
2045 | struct ieee80211_rtap_hdr { | |
2046 | struct ieee80211_radiotap_header hdr; | |
2047 | u8 flags; | |
5f0b7de5 | 2048 | u8 rate_or_pad; |
3d30d949 MW |
2049 | __le16 chan_freq; |
2050 | __le16 chan_flags; | |
2051 | } __attribute__ ((packed)) *rthdr; | |
2052 | struct sk_buff *skb = rx->skb, *skb2; | |
2053 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2054 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2055 | |
8c0c709e | 2056 | if (status->flag & RX_FLAG_INTERNAL_CMTR) |
3d30d949 MW |
2057 | goto out_free_skb; |
2058 | ||
2059 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
2060 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2061 | goto out_free_skb; | |
2062 | ||
2063 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2064 | memset(rthdr, 0, sizeof(*rthdr)); | |
2065 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2066 | rthdr->hdr.it_present = | |
2067 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2068 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2069 | ||
5f0b7de5 JB |
2070 | if (rate) { |
2071 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2072 | rthdr->hdr.it_present |= | |
2073 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2074 | } | |
3d30d949 MW |
2075 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2076 | ||
2077 | if (status->band == IEEE80211_BAND_5GHZ) | |
2078 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2079 | IEEE80211_CHAN_5GHZ); | |
2080 | else | |
2081 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2082 | IEEE80211_CHAN_2GHZ); | |
2083 | ||
2084 | skb_set_mac_header(skb, 0); | |
2085 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2086 | skb->pkt_type = PACKET_OTHERHOST; | |
2087 | skb->protocol = htons(ETH_P_802_2); | |
2088 | ||
2089 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2090 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2091 | continue; |
2092 | ||
05c914fe | 2093 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2094 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2095 | continue; | |
2096 | ||
2097 | if (prev_dev) { | |
2098 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2099 | if (skb2) { | |
2100 | skb2->dev = prev_dev; | |
2101 | netif_rx(skb2); | |
2102 | } | |
2103 | } | |
2104 | ||
2105 | prev_dev = sdata->dev; | |
2106 | sdata->dev->stats.rx_packets++; | |
2107 | sdata->dev->stats.rx_bytes += skb->len; | |
2108 | } | |
2109 | ||
2110 | if (prev_dev) { | |
2111 | skb->dev = prev_dev; | |
2112 | netif_rx(skb); | |
2113 | skb = NULL; | |
2114 | } else | |
2115 | goto out_free_skb; | |
2116 | ||
8c0c709e | 2117 | status->flag |= RX_FLAG_INTERNAL_CMTR; |
3d30d949 MW |
2118 | return; |
2119 | ||
2120 | out_free_skb: | |
2121 | dev_kfree_skb(skb); | |
2122 | } | |
2123 | ||
571ecf67 | 2124 | |
8944b79f | 2125 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2126 | struct ieee80211_rx_data *rx, |
5f0b7de5 JB |
2127 | struct sk_buff *skb, |
2128 | struct ieee80211_rate *rate) | |
58905290 | 2129 | { |
2569a826 | 2130 | struct sk_buff_head reorder_release; |
58905290 JB |
2131 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2132 | ||
2569a826 JB |
2133 | __skb_queue_head_init(&reorder_release); |
2134 | ||
8944b79f JB |
2135 | rx->skb = skb; |
2136 | rx->sdata = sdata; | |
8944b79f | 2137 | |
e32f85f7 LCC |
2138 | #define CALL_RXH(rxh) \ |
2139 | do { \ | |
2140 | res = rxh(rx); \ | |
2141 | if (res != RX_CONTINUE) \ | |
2569a826 | 2142 | goto rxh_next; \ |
e32f85f7 | 2143 | } while (0); |
49461622 | 2144 | |
2569a826 JB |
2145 | /* |
2146 | * NB: the rxh_next label works even if we jump | |
2147 | * to it from here because then the list will | |
2148 | * be empty, which is a trivial check | |
2149 | */ | |
49461622 JB |
2150 | CALL_RXH(ieee80211_rx_h_passive_scan) |
2151 | CALL_RXH(ieee80211_rx_h_check) | |
2569a826 JB |
2152 | |
2153 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); | |
2154 | ||
2155 | while ((skb = __skb_dequeue(&reorder_release))) { | |
2156 | /* | |
2157 | * all the other fields are valid across frames | |
2158 | * that belong to an aMPDU since they are on the | |
2159 | * same TID from the same station | |
2160 | */ | |
2161 | rx->skb = skb; | |
2162 | ||
2163 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2164 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2165 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2166 | CALL_RXH(ieee80211_rx_h_defragment) | |
2167 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2168 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2169 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2170 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2171 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2172 | #ifdef CONFIG_MAC80211_MESH |
2569a826 JB |
2173 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2174 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2175 | #endif |
2569a826 JB |
2176 | CALL_RXH(ieee80211_rx_h_data) |
2177 | ||
2178 | /* special treatment -- needs the queue */ | |
2179 | res = ieee80211_rx_h_ctrl(rx, &reorder_release); | |
2180 | if (res != RX_CONTINUE) | |
2181 | goto rxh_next; | |
2182 | ||
2183 | CALL_RXH(ieee80211_rx_h_action) | |
2184 | CALL_RXH(ieee80211_rx_h_mgmt) | |
49461622 JB |
2185 | |
2186 | #undef CALL_RXH | |
2187 | ||
2569a826 JB |
2188 | rxh_next: |
2189 | switch (res) { | |
2190 | case RX_DROP_MONITOR: | |
2191 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2192 | if (rx->sta) | |
2193 | rx->sta->rx_dropped++; | |
2194 | /* fall through */ | |
2195 | case RX_CONTINUE: | |
2196 | ieee80211_rx_cooked_monitor(rx, rate); | |
2197 | break; | |
2198 | case RX_DROP_UNUSABLE: | |
2199 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2200 | if (rx->sta) | |
2201 | rx->sta->rx_dropped++; | |
2202 | dev_kfree_skb(rx->skb); | |
2203 | break; | |
2204 | case RX_QUEUED: | |
2205 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2206 | break; | |
2207 | } | |
58905290 JB |
2208 | } |
2209 | } | |
2210 | ||
571ecf67 JB |
2211 | /* main receive path */ |
2212 | ||
23a24def | 2213 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2214 | struct ieee80211_rx_data *rx, |
23a24def JB |
2215 | struct ieee80211_hdr *hdr) |
2216 | { | |
eb9fb5b8 JB |
2217 | struct sk_buff *skb = rx->skb; |
2218 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2219 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2220 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2221 | ||
51fb61e7 | 2222 | switch (sdata->vif.type) { |
05c914fe | 2223 | case NL80211_IFTYPE_STATION: |
9bc383de | 2224 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2225 | return 0; |
77fdaa12 | 2226 | if (!multicast && |
47846c9b | 2227 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2228 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2229 | return 0; |
5cf121c3 | 2230 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2231 | } |
2232 | break; | |
05c914fe | 2233 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2234 | if (!bssid) |
2235 | return 0; | |
a7767f95 | 2236 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2237 | return 1; |
87291c02 | 2238 | } |
46900298 | 2239 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2240 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2241 | return 0; |
5cf121c3 | 2242 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2243 | } else if (!multicast && |
47846c9b | 2244 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2245 | hdr->addr1) != 0) { |
4150c572 | 2246 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2247 | return 0; |
5cf121c3 | 2248 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2249 | } else if (!rx->sta) { |
2250 | int rate_idx; | |
eb9fb5b8 | 2251 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2252 | rate_idx = 0; /* TODO: HT rates */ |
2253 | else | |
eb9fb5b8 | 2254 | rate_idx = status->rate_idx; |
34e89507 JB |
2255 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2256 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2257 | } |
23a24def | 2258 | break; |
05c914fe | 2259 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2260 | if (!multicast && |
47846c9b | 2261 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2262 | hdr->addr1) != 0) { |
2263 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2264 | return 0; | |
2265 | ||
5cf121c3 | 2266 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2267 | } |
2268 | break; | |
05c914fe JB |
2269 | case NL80211_IFTYPE_AP_VLAN: |
2270 | case NL80211_IFTYPE_AP: | |
23a24def | 2271 | if (!bssid) { |
47846c9b | 2272 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2273 | hdr->addr1)) |
2274 | return 0; | |
2275 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2276 | sdata->vif.addr)) { |
5cf121c3 | 2277 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2278 | return 0; |
5cf121c3 | 2279 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2280 | } |
23a24def | 2281 | break; |
05c914fe | 2282 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2283 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2284 | return 0; |
2285 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2286 | return 0; | |
2287 | break; | |
05c914fe | 2288 | case NL80211_IFTYPE_MONITOR: |
05c914fe JB |
2289 | case NL80211_IFTYPE_UNSPECIFIED: |
2290 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2291 | /* should never get here */ |
2292 | WARN_ON(1); | |
2293 | break; | |
23a24def JB |
2294 | } |
2295 | ||
2296 | return 1; | |
2297 | } | |
2298 | ||
571ecf67 | 2299 | /* |
6368e4b1 RR |
2300 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2301 | * be called with rcu_read_lock protection. | |
571ecf67 | 2302 | */ |
71ebb4aa RR |
2303 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2304 | struct sk_buff *skb, | |
8318d78a | 2305 | struct ieee80211_rate *rate) |
571ecf67 | 2306 | { |
f1d58c25 | 2307 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2308 | struct ieee80211_local *local = hw_to_local(hw); |
2309 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2310 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2311 | struct ieee80211_rx_data rx; |
6368e4b1 | 2312 | int prepares; |
8e6f0032 JB |
2313 | struct ieee80211_sub_if_data *prev = NULL; |
2314 | struct sk_buff *skb_new; | |
abe60632 JB |
2315 | struct sta_info *sta, *tmp; |
2316 | bool found_sta = false; | |
571ecf67 | 2317 | |
358c8d9d | 2318 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2319 | memset(&rx, 0, sizeof(rx)); |
2320 | rx.skb = skb; | |
2321 | rx.local = local; | |
72abd81b | 2322 | |
358c8d9d | 2323 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2324 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2325 | |
142b9f50 HS |
2326 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2327 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2328 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2329 | |
38f3714d | 2330 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2331 | ieee80211_verify_alignment(&rx); |
38f3714d | 2332 | |
abe60632 JB |
2333 | if (ieee80211_is_data(hdr->frame_control)) { |
2334 | for_each_sta_info(local, hdr->addr2, sta, tmp) { | |
2335 | rx.sta = sta; | |
2336 | found_sta = true; | |
2337 | rx.sdata = sta->sdata; | |
2338 | ||
2339 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2340 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
2341 | if (prepares) { | |
2342 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2343 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2344 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2345 | } else | |
2346 | prev = rx.sdata; | |
2347 | } | |
af2ced6a | 2348 | } |
abe60632 JB |
2349 | } |
2350 | if (!found_sta) { | |
2351 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2352 | if (!ieee80211_sdata_running(sdata)) |
abe60632 | 2353 | continue; |
2a8a9a88 | 2354 | |
abe60632 JB |
2355 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2356 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2357 | continue; | |
b2e7771e | 2358 | |
abe60632 JB |
2359 | /* |
2360 | * frame is destined for this interface, but if it's | |
2361 | * not also for the previous one we handle that after | |
2362 | * the loop to avoid copying the SKB once too much | |
2363 | */ | |
340e11f3 | 2364 | |
abe60632 JB |
2365 | if (!prev) { |
2366 | prev = sdata; | |
2367 | continue; | |
2368 | } | |
340e11f3 | 2369 | |
4754ffd6 | 2370 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2371 | |
2372 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2373 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2374 | ||
2375 | if (!prepares) | |
2376 | goto next; | |
2377 | ||
2378 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2379 | rx.sdata = prev; | |
2380 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2381 | ieee80211_rx_michael_mic_report(hdr, | |
2382 | &rx); | |
2383 | goto next; | |
2384 | } | |
2385 | ||
abe60632 JB |
2386 | /* |
2387 | * frame was destined for the previous interface | |
2388 | * so invoke RX handlers for it | |
2389 | */ | |
2390 | ||
2391 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2392 | if (!skb_new) { | |
2393 | if (net_ratelimit()) | |
2394 | printk(KERN_DEBUG "%s: failed to copy " | |
2395 | "multicast frame for %s\n", | |
2396 | wiphy_name(local->hw.wiphy), | |
47846c9b | 2397 | prev->name); |
4bb29f8c | 2398 | goto next; |
abe60632 JB |
2399 | } |
2400 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate); | |
4bb29f8c | 2401 | next: |
abe60632 | 2402 | prev = sdata; |
340e11f3 | 2403 | } |
4bb29f8c FF |
2404 | |
2405 | if (prev) { | |
4754ffd6 | 2406 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2407 | |
2408 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2409 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2410 | ||
2411 | if (!prepares) | |
2412 | prev = NULL; | |
2413 | } | |
571ecf67 | 2414 | } |
a4b7d7bd | 2415 | if (prev) |
5f0b7de5 | 2416 | ieee80211_invoke_rx_handlers(prev, &rx, skb, rate); |
a4b7d7bd | 2417 | else |
8e6f0032 | 2418 | dev_kfree_skb(skb); |
571ecf67 | 2419 | } |
6368e4b1 RR |
2420 | |
2421 | /* | |
2422 | * This is the receive path handler. It is called by a low level driver when an | |
2423 | * 802.11 MPDU is received from the hardware. | |
2424 | */ | |
103bf9f7 | 2425 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2426 | { |
2427 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2428 | struct ieee80211_rate *rate = NULL; |
2429 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2430 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2431 | |
d20ef63d JB |
2432 | WARN_ON_ONCE(softirq_count() == 0); |
2433 | ||
77a980dc JB |
2434 | if (WARN_ON(status->band < 0 || |
2435 | status->band >= IEEE80211_NUM_BANDS)) | |
2436 | goto drop; | |
8318d78a JB |
2437 | |
2438 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2439 | if (WARN_ON(!sband)) |
2440 | goto drop; | |
8318d78a | 2441 | |
89c3a8ac JB |
2442 | /* |
2443 | * If we're suspending, it is possible although not too likely | |
2444 | * that we'd be receiving frames after having already partially | |
2445 | * quiesced the stack. We can't process such frames then since | |
2446 | * that might, for example, cause stations to be added or other | |
2447 | * driver callbacks be invoked. | |
2448 | */ | |
77a980dc JB |
2449 | if (unlikely(local->quiescing || local->suspended)) |
2450 | goto drop; | |
89c3a8ac | 2451 | |
ea77f12f JB |
2452 | /* |
2453 | * The same happens when we're not even started, | |
2454 | * but that's worth a warning. | |
2455 | */ | |
77a980dc JB |
2456 | if (WARN_ON(!local->started)) |
2457 | goto drop; | |
ea77f12f | 2458 | |
0fb8ca45 | 2459 | if (status->flag & RX_FLAG_HT) { |
e5d6eb83 LR |
2460 | /* |
2461 | * rate_idx is MCS index, which can be [0-76] as documented on: | |
2462 | * | |
2463 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2464 | * | |
2465 | * Anything else would be some sort of driver or hardware error. | |
2466 | * The driver should catch hardware errors. | |
2467 | */ | |
2468 | if (WARN((status->rate_idx < 0 || | |
2469 | status->rate_idx > 76), | |
2470 | "Rate marked as an HT rate but passed " | |
2471 | "status->rate_idx is not " | |
2472 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2473 | status->rate_idx, | |
2474 | status->rate_idx)) | |
77a980dc | 2475 | goto drop; |
0fb8ca45 JM |
2476 | } else { |
2477 | if (WARN_ON(status->rate_idx < 0 || | |
2478 | status->rate_idx >= sband->n_bitrates)) | |
77a980dc | 2479 | goto drop; |
0fb8ca45 JM |
2480 | rate = &sband->bitrates[status->rate_idx]; |
2481 | } | |
6368e4b1 RR |
2482 | |
2483 | /* | |
2484 | * key references and virtual interfaces are protected using RCU | |
2485 | * and this requires that we are in a read-side RCU section during | |
2486 | * receive processing | |
2487 | */ | |
2488 | rcu_read_lock(); | |
2489 | ||
2490 | /* | |
2491 | * Frames with failed FCS/PLCP checksum are not returned, | |
2492 | * all other frames are returned without radiotap header | |
2493 | * if it was previously present. | |
2494 | * Also, frames with less than 16 bytes are dropped. | |
2495 | */ | |
f1d58c25 | 2496 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2497 | if (!skb) { |
2498 | rcu_read_unlock(); | |
2499 | return; | |
2500 | } | |
2501 | ||
2569a826 | 2502 | __ieee80211_rx_handle_packet(hw, skb, rate); |
6368e4b1 RR |
2503 | |
2504 | rcu_read_unlock(); | |
77a980dc JB |
2505 | |
2506 | return; | |
2507 | drop: | |
2508 | kfree_skb(skb); | |
6368e4b1 | 2509 | } |
103bf9f7 | 2510 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2511 | |
2512 | /* This is a version of the rx handler that can be called from hard irq | |
2513 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2514 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2515 | { |
2516 | struct ieee80211_local *local = hw_to_local(hw); | |
2517 | ||
2518 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2519 | ||
571ecf67 JB |
2520 | skb->pkt_type = IEEE80211_RX_MSG; |
2521 | skb_queue_tail(&local->skb_queue, skb); | |
2522 | tasklet_schedule(&local->tasklet); | |
2523 | } | |
2524 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |