Commit | Line | Data |
---|---|---|
571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
84040805 | 5 | * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> |
571ecf67 JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
b2e7771e JB |
30 | /* |
31 | * monitor mode reception | |
32 | * | |
33 | * This function cleans up the SKB, i.e. it removes all the stuff | |
34 | * only useful for monitoring. | |
35 | */ | |
36 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 37 | struct sk_buff *skb) |
b2e7771e | 38 | { |
b2e7771e JB |
39 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
40 | if (likely(skb->len > FCS_LEN)) | |
e3cf8b3f | 41 | __pskb_trim(skb, skb->len - FCS_LEN); |
b2e7771e JB |
42 | else { |
43 | /* driver bug */ | |
44 | WARN_ON(1); | |
45 | dev_kfree_skb(skb); | |
46 | skb = NULL; | |
47 | } | |
48 | } | |
49 | ||
50 | return skb; | |
51 | } | |
52 | ||
f1d58c25 | 53 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 54 | int present_fcs_len) |
b2e7771e | 55 | { |
f1d58c25 | 56 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 57 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
58 | |
59 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
60 | return 1; | |
0869aea0 | 61 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 62 | return 1; |
87228f57 HH |
63 | if (ieee80211_is_ctl(hdr->frame_control) && |
64 | !ieee80211_is_pspoll(hdr->frame_control) && | |
65 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
66 | return 1; |
67 | return 0; | |
68 | } | |
69 | ||
601ae7f2 BR |
70 | static int |
71 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
72 | struct ieee80211_rx_status *status) | |
73 | { | |
74 | int len; | |
75 | ||
76 | /* always present fields */ | |
77 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
78 | ||
79 | if (status->flag & RX_FLAG_TSFT) | |
80 | len += 8; | |
7fee5372 | 81 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
82 | len += 1; |
83 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
84 | len += 1; | |
85 | ||
86 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
87 | len++; | |
88 | ||
601ae7f2 BR |
89 | return len; |
90 | } | |
91 | ||
d1c3a37c | 92 | /* |
601ae7f2 BR |
93 | * ieee80211_add_rx_radiotap_header - add radiotap header |
94 | * | |
95 | * add a radiotap header containing all the fields which the hardware provided. | |
96 | */ | |
97 | static void | |
98 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
99 | struct sk_buff *skb, | |
601ae7f2 BR |
100 | struct ieee80211_rate *rate, |
101 | int rtap_len) | |
102 | { | |
f1d58c25 | 103 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
104 | struct ieee80211_radiotap_header *rthdr; |
105 | unsigned char *pos; | |
6a86b9c7 | 106 | u16 rx_flags = 0; |
601ae7f2 BR |
107 | |
108 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
109 | memset(rthdr, 0, rtap_len); | |
110 | ||
111 | /* radiotap header, set always present flags */ | |
112 | rthdr->it_present = | |
113 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
114 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
115 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
116 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
117 | rthdr->it_len = cpu_to_le16(rtap_len); | |
118 | ||
119 | pos = (unsigned char *)(rthdr+1); | |
120 | ||
121 | /* the order of the following fields is important */ | |
122 | ||
123 | /* IEEE80211_RADIOTAP_TSFT */ | |
124 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 125 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
126 | rthdr->it_present |= |
127 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
128 | pos += 8; | |
129 | } | |
130 | ||
131 | /* IEEE80211_RADIOTAP_FLAGS */ | |
132 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
133 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
134 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
135 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
136 | if (status->flag & RX_FLAG_SHORTPRE) |
137 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
138 | pos++; |
139 | ||
140 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
141 | if (status->flag & RX_FLAG_HT) { |
142 | /* | |
143 | * TODO: add following information into radiotap header once | |
144 | * suitable fields are defined for it: | |
145 | * - MCS index (status->rate_idx) | |
146 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
147 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
148 | */ | |
149 | *pos = 0; | |
8d6f658e | 150 | } else { |
ebe6c7ba | 151 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 152 | *pos = rate->bitrate / 5; |
8d6f658e | 153 | } |
601ae7f2 BR |
154 | pos++; |
155 | ||
156 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 157 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
158 | pos += 2; |
159 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
160 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
161 | pos); | |
5f0b7de5 JB |
162 | else if (status->flag & RX_FLAG_HT) |
163 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
164 | pos); | |
9deb1ae5 | 165 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
166 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
167 | pos); | |
601ae7f2 | 168 | else |
6a86b9c7 JB |
169 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
170 | pos); | |
601ae7f2 BR |
171 | pos += 2; |
172 | ||
173 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
174 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
175 | *pos = status->signal; | |
176 | rthdr->it_present |= | |
177 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
178 | pos++; | |
179 | } | |
180 | ||
601ae7f2 BR |
181 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
182 | ||
183 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
184 | *pos = status->antenna; | |
185 | pos++; | |
186 | ||
601ae7f2 BR |
187 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
188 | ||
189 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
190 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 191 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 192 | pos++; |
aae89831 | 193 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
194 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
195 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
196 | pos += 2; |
197 | } | |
198 | ||
b2e7771e JB |
199 | /* |
200 | * This function copies a received frame to all monitor interfaces and | |
201 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
202 | * radiotap header the driver might have added. | |
203 | */ | |
204 | static struct sk_buff * | |
205 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 206 | struct ieee80211_rate *rate) |
b2e7771e | 207 | { |
f1d58c25 | 208 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 209 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 210 | int needed_headroom = 0; |
b2e7771e JB |
211 | struct sk_buff *skb, *skb2; |
212 | struct net_device *prev_dev = NULL; | |
213 | int present_fcs_len = 0; | |
b2e7771e JB |
214 | |
215 | /* | |
216 | * First, we may need to make a copy of the skb because | |
217 | * (1) we need to modify it for radiotap (if not present), and | |
218 | * (2) the other RX handlers will modify the skb we got. | |
219 | * | |
220 | * We don't need to, of course, if we aren't going to return | |
221 | * the SKB because it has a bad FCS/PLCP checksum. | |
222 | */ | |
0869aea0 JB |
223 | |
224 | /* room for the radiotap header based on driver features */ | |
225 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
226 | |
227 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
228 | present_fcs_len = FCS_LEN; | |
229 | ||
e3cf8b3f ZY |
230 | /* make sure hdr->frame_control is on the linear part */ |
231 | if (!pskb_may_pull(origskb, 2)) { | |
232 | dev_kfree_skb(origskb); | |
233 | return NULL; | |
234 | } | |
235 | ||
b2e7771e | 236 | if (!local->monitors) { |
0869aea0 | 237 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
238 | dev_kfree_skb(origskb); |
239 | return NULL; | |
240 | } | |
241 | ||
0869aea0 | 242 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
243 | } |
244 | ||
0869aea0 | 245 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
246 | /* only need to expand headroom if necessary */ |
247 | skb = origskb; | |
248 | origskb = NULL; | |
249 | ||
250 | /* | |
251 | * This shouldn't trigger often because most devices have an | |
252 | * RX header they pull before we get here, and that should | |
253 | * be big enough for our radiotap information. We should | |
254 | * probably export the length to drivers so that we can have | |
255 | * them allocate enough headroom to start with. | |
256 | */ | |
257 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 258 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
259 | dev_kfree_skb(skb); |
260 | return NULL; | |
261 | } | |
262 | } else { | |
263 | /* | |
264 | * Need to make a copy and possibly remove radiotap header | |
265 | * and FCS from the original. | |
266 | */ | |
267 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
268 | ||
0869aea0 | 269 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
270 | |
271 | if (!skb) | |
272 | return origskb; | |
273 | } | |
274 | ||
0869aea0 JB |
275 | /* prepend radiotap information */ |
276 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 277 | |
ce3edf6d | 278 | skb_reset_mac_header(skb); |
b2e7771e JB |
279 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
280 | skb->pkt_type = PACKET_OTHERHOST; | |
281 | skb->protocol = htons(ETH_P_802_2); | |
282 | ||
283 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
05c914fe | 284 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
285 | continue; |
286 | ||
3d30d949 MW |
287 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
288 | continue; | |
289 | ||
9607e6b6 | 290 | if (!ieee80211_sdata_running(sdata)) |
47846c9b JB |
291 | continue; |
292 | ||
b2e7771e JB |
293 | if (prev_dev) { |
294 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
295 | if (skb2) { | |
296 | skb2->dev = prev_dev; | |
297 | netif_rx(skb2); | |
298 | } | |
299 | } | |
300 | ||
301 | prev_dev = sdata->dev; | |
302 | sdata->dev->stats.rx_packets++; | |
303 | sdata->dev->stats.rx_bytes += skb->len; | |
304 | } | |
305 | ||
306 | if (prev_dev) { | |
307 | skb->dev = prev_dev; | |
308 | netif_rx(skb); | |
309 | } else | |
310 | dev_kfree_skb(skb); | |
311 | ||
312 | return origskb; | |
313 | } | |
314 | ||
315 | ||
5cf121c3 | 316 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 317 | { |
238f74a2 | 318 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
319 | int tid; |
320 | ||
321 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
322 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
323 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 324 | /* frame has qos control */ |
238f74a2 HH |
325 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
326 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 327 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 328 | else |
5cf121c3 | 329 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 330 | } else { |
1411f9b5 JB |
331 | /* |
332 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
333 | * | |
334 | * Sequence numbers for management frames, QoS data | |
335 | * frames with a broadcast/multicast address in the | |
336 | * Address 1 field, and all non-QoS data frames sent | |
337 | * by QoS STAs are assigned using an additional single | |
338 | * modulo-4096 counter, [...] | |
339 | * | |
340 | * We also use that counter for non-QoS STAs. | |
341 | */ | |
342 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 343 | } |
52865dfd | 344 | |
5cf121c3 | 345 | rx->queue = tid; |
6e0d114d JB |
346 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
347 | * For now, set skb->priority to 0 for other cases. */ | |
348 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 349 | } |
6e0d114d | 350 | |
d1c3a37c JB |
351 | /** |
352 | * DOC: Packet alignment | |
353 | * | |
354 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
355 | * to the stack. | |
356 | * | |
357 | * Additionally, should, if possible, align the payload data in a way that | |
358 | * guarantees that the contained IP header is aligned to a four-byte | |
359 | * boundary. In the case of regular frames, this simply means aligning the | |
360 | * payload to a four-byte boundary (because either the IP header is directly | |
361 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
59d9cb07 KV |
362 | * in front of it). If the payload data is not properly aligned and the |
363 | * architecture doesn't support efficient unaligned operations, mac80211 | |
364 | * will align the data. | |
d1c3a37c JB |
365 | * |
366 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
367 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
368 | * push the IP header further back to a multiple of four again. Thankfully, the | |
369 | * specs were sane enough this time around to require padding each A-MSDU | |
370 | * subframe to a length that is a multiple of four. | |
371 | * | |
372 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
373 | * the payload is not supported, the driver is required to move the 802.11 | |
374 | * header to be directly in front of the payload in that case. | |
375 | */ | |
376 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 377 | { |
59d9cb07 KV |
378 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
379 | WARN_ONCE((unsigned long)rx->skb->data & 1, | |
380 | "unaligned packet at 0x%p\n", rx->skb->data); | |
d1c3a37c | 381 | #endif |
6e0d114d JB |
382 | } |
383 | ||
6368e4b1 | 384 | |
571ecf67 JB |
385 | /* rx handlers */ |
386 | ||
49461622 | 387 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 388 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
389 | { |
390 | struct ieee80211_local *local = rx->local; | |
391 | struct sk_buff *skb = rx->skb; | |
392 | ||
fbe9c429 | 393 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 394 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 395 | |
142b9f50 HS |
396 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
397 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 398 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 399 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 400 | dev_kfree_skb(skb); |
9ae54c84 | 401 | return RX_QUEUED; |
571ecf67 JB |
402 | } |
403 | ||
5cf121c3 | 404 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
405 | /* scanning finished during invoking of handlers */ |
406 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 407 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
408 | } |
409 | ||
9ae54c84 | 410 | return RX_CONTINUE; |
571ecf67 JB |
411 | } |
412 | ||
3cfcf6ac JM |
413 | |
414 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
415 | { | |
416 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
417 | ||
418 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
419 | return 0; | |
420 | ||
421 | return ieee80211_is_robust_mgmt_frame(hdr); | |
422 | } | |
423 | ||
424 | ||
425 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
426 | { | |
427 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
428 | ||
429 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
430 | return 0; | |
431 | ||
432 | return ieee80211_is_robust_mgmt_frame(hdr); | |
433 | } | |
434 | ||
435 | ||
436 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
437 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
438 | { | |
439 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
440 | struct ieee80211_mmie *mmie; | |
441 | ||
442 | if (skb->len < 24 + sizeof(*mmie) || | |
443 | !is_multicast_ether_addr(hdr->da)) | |
444 | return -1; | |
445 | ||
446 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
447 | return -1; /* not a robust management frame */ | |
448 | ||
449 | mmie = (struct ieee80211_mmie *) | |
450 | (skb->data + skb->len - sizeof(*mmie)); | |
451 | if (mmie->element_id != WLAN_EID_MMIE || | |
452 | mmie->length != sizeof(*mmie) - 2) | |
453 | return -1; | |
454 | ||
455 | return le16_to_cpu(mmie->key_id); | |
456 | } | |
457 | ||
458 | ||
33b64eb2 | 459 | static ieee80211_rx_result |
5cf121c3 | 460 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 461 | { |
a7767f95 HH |
462 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
463 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
47846c9b | 464 | char *dev_addr = rx->sdata->vif.addr; |
d6d1a5a7 | 465 | |
a7767f95 | 466 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
467 | if (is_multicast_ether_addr(hdr->addr1)) { |
468 | if (ieee80211_has_tods(hdr->frame_control) || | |
469 | !ieee80211_has_fromds(hdr->frame_control)) | |
470 | return RX_DROP_MONITOR; | |
471 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
472 | return RX_DROP_MONITOR; | |
473 | } else { | |
474 | if (!ieee80211_has_a4(hdr->frame_control)) | |
475 | return RX_DROP_MONITOR; | |
476 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
477 | return RX_DROP_MONITOR; | |
478 | } | |
33b64eb2 LCC |
479 | } |
480 | ||
481 | /* If there is not an established peer link and this is not a peer link | |
482 | * establisment frame, beacon or probe, drop the frame. | |
483 | */ | |
484 | ||
b4e08ea1 | 485 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 486 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 487 | |
a7767f95 | 488 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
489 | return RX_DROP_MONITOR; |
490 | ||
a7767f95 | 491 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 492 | mgmt = (struct ieee80211_mgmt *)hdr; |
0938393f | 493 | if (mgmt->u.action.category != MESH_PLINK_CATEGORY) |
33b64eb2 | 494 | return RX_DROP_MONITOR; |
33b64eb2 | 495 | return RX_CONTINUE; |
33b64eb2 LCC |
496 | } |
497 | ||
a7767f95 HH |
498 | if (ieee80211_is_probe_req(hdr->frame_control) || |
499 | ieee80211_is_probe_resp(hdr->frame_control) || | |
500 | ieee80211_is_beacon(hdr->frame_control)) | |
501 | return RX_CONTINUE; | |
502 | ||
503 | return RX_DROP_MONITOR; | |
504 | ||
505 | } | |
506 | ||
507 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
508 | ||
509 | if (ieee80211_is_data(hdr->frame_control) && | |
510 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 511 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 512 | return RX_DROP_MONITOR; |
902acc78 | 513 | #undef msh_h_get |
d6d1a5a7 | 514 | |
902acc78 JB |
515 | return RX_CONTINUE; |
516 | } | |
33b64eb2 | 517 | |
1edfb1af JB |
518 | #define SEQ_MODULO 0x1000 |
519 | #define SEQ_MASK 0xfff | |
520 | ||
521 | static inline int seq_less(u16 sq1, u16 sq2) | |
522 | { | |
523 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); | |
524 | } | |
525 | ||
526 | static inline u16 seq_inc(u16 sq) | |
527 | { | |
528 | return (sq + 1) & SEQ_MASK; | |
529 | } | |
530 | ||
531 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
532 | { | |
533 | return (sq1 - sq2) & SEQ_MASK; | |
534 | } | |
535 | ||
536 | ||
537 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, | |
538 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
539 | int index, |
540 | struct sk_buff_head *frames) | |
1edfb1af JB |
541 | { |
542 | struct ieee80211_supported_band *sband; | |
543 | struct ieee80211_rate *rate = NULL; | |
544 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; | |
545 | struct ieee80211_rx_status *status; | |
546 | ||
547 | if (!skb) | |
548 | goto no_frame; | |
549 | ||
550 | status = IEEE80211_SKB_RXCB(skb); | |
551 | ||
552 | /* release the reordered frames to stack */ | |
553 | sband = hw->wiphy->bands[status->band]; | |
554 | if (!(status->flag & RX_FLAG_HT)) | |
555 | rate = &sband->bitrates[status->rate_idx]; | |
1edfb1af JB |
556 | tid_agg_rx->stored_mpdu_num--; |
557 | tid_agg_rx->reorder_buf[index] = NULL; | |
d29cecda | 558 | __skb_queue_tail(frames, skb); |
1edfb1af JB |
559 | |
560 | no_frame: | |
561 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
562 | } | |
563 | ||
564 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, | |
565 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
566 | u16 head_seq_num, |
567 | struct sk_buff_head *frames) | |
1edfb1af JB |
568 | { |
569 | int index; | |
570 | ||
571 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
572 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
573 | tid_agg_rx->buf_size; | |
2569a826 | 574 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
575 | } |
576 | } | |
577 | ||
578 | /* | |
579 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
580 | * the skb was added to the buffer longer than this time ago, the earlier | |
581 | * frames that have not yet been received are assumed to be lost and the skb | |
582 | * can be released for processing. This may also release other skb's from the | |
583 | * reorder buffer if there are no additional gaps between the frames. | |
584 | */ | |
585 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
586 | ||
587 | /* | |
588 | * As this function belongs to the RX path it must be under | |
589 | * rcu_read_lock protection. It returns false if the frame | |
590 | * can be processed immediately, true if it was consumed. | |
591 | */ | |
592 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, | |
593 | struct tid_ampdu_rx *tid_agg_rx, | |
2569a826 JB |
594 | struct sk_buff *skb, |
595 | struct sk_buff_head *frames) | |
1edfb1af JB |
596 | { |
597 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
598 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
599 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
600 | u16 head_seq_num, buf_size; | |
601 | int index; | |
602 | ||
603 | buf_size = tid_agg_rx->buf_size; | |
604 | head_seq_num = tid_agg_rx->head_seq_num; | |
605 | ||
606 | /* frame with out of date sequence number */ | |
607 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
608 | dev_kfree_skb(skb); | |
609 | return true; | |
610 | } | |
611 | ||
612 | /* | |
613 | * If frame the sequence number exceeds our buffering window | |
614 | * size release some previous frames to make room for this one. | |
615 | */ | |
616 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
617 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
618 | /* release stored frames up to new head to stack */ | |
2569a826 JB |
619 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
620 | frames); | |
1edfb1af JB |
621 | } |
622 | ||
623 | /* Now the new frame is always in the range of the reordering buffer */ | |
624 | ||
625 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
626 | ||
627 | /* check if we already stored this frame */ | |
628 | if (tid_agg_rx->reorder_buf[index]) { | |
629 | dev_kfree_skb(skb); | |
630 | return true; | |
631 | } | |
632 | ||
633 | /* | |
634 | * If the current MPDU is in the right order and nothing else | |
635 | * is stored we can process it directly, no need to buffer it. | |
636 | */ | |
637 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
638 | tid_agg_rx->stored_mpdu_num == 0) { | |
639 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
640 | return false; | |
641 | } | |
642 | ||
643 | /* put the frame in the reordering buffer */ | |
644 | tid_agg_rx->reorder_buf[index] = skb; | |
645 | tid_agg_rx->reorder_time[index] = jiffies; | |
646 | tid_agg_rx->stored_mpdu_num++; | |
647 | /* release the buffer until next missing frame */ | |
648 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
649 | tid_agg_rx->buf_size; | |
650 | if (!tid_agg_rx->reorder_buf[index] && | |
651 | tid_agg_rx->stored_mpdu_num > 1) { | |
652 | /* | |
653 | * No buffers ready to be released, but check whether any | |
654 | * frames in the reorder buffer have timed out. | |
655 | */ | |
656 | int j; | |
657 | int skipped = 1; | |
658 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
659 | j = (j + 1) % tid_agg_rx->buf_size) { | |
660 | if (!tid_agg_rx->reorder_buf[j]) { | |
661 | skipped++; | |
662 | continue; | |
663 | } | |
664 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
665 | HT_RX_REORDER_BUF_TIMEOUT)) | |
666 | break; | |
667 | ||
668 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
669 | if (net_ratelimit()) | |
670 | printk(KERN_DEBUG "%s: release an RX reorder " | |
671 | "frame due to timeout on earlier " | |
672 | "frames\n", | |
673 | wiphy_name(hw->wiphy)); | |
674 | #endif | |
2569a826 JB |
675 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
676 | j, frames); | |
1edfb1af JB |
677 | |
678 | /* | |
679 | * Increment the head seq# also for the skipped slots. | |
680 | */ | |
681 | tid_agg_rx->head_seq_num = | |
682 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; | |
683 | skipped = 0; | |
684 | } | |
685 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2569a826 | 686 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
1edfb1af JB |
687 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
688 | tid_agg_rx->buf_size; | |
689 | } | |
690 | ||
691 | return true; | |
692 | } | |
693 | ||
694 | /* | |
695 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
696 | * true if the MPDU was buffered, false if it should be processed. | |
697 | */ | |
2569a826 JB |
698 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
699 | struct sk_buff_head *frames) | |
1edfb1af | 700 | { |
2569a826 JB |
701 | struct sk_buff *skb = rx->skb; |
702 | struct ieee80211_local *local = rx->local; | |
1edfb1af JB |
703 | struct ieee80211_hw *hw = &local->hw; |
704 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2569a826 | 705 | struct sta_info *sta = rx->sta; |
1edfb1af JB |
706 | struct tid_ampdu_rx *tid_agg_rx; |
707 | u16 sc; | |
708 | int tid; | |
709 | ||
710 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
2569a826 | 711 | goto dont_reorder; |
1edfb1af JB |
712 | |
713 | /* | |
714 | * filter the QoS data rx stream according to | |
715 | * STA/TID and check if this STA/TID is on aggregation | |
716 | */ | |
717 | ||
1edfb1af | 718 | if (!sta) |
2569a826 | 719 | goto dont_reorder; |
1edfb1af JB |
720 | |
721 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
722 | ||
723 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) | |
2569a826 | 724 | goto dont_reorder; |
1edfb1af JB |
725 | |
726 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
727 | ||
728 | /* qos null data frames are excluded */ | |
729 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
2569a826 | 730 | goto dont_reorder; |
1edfb1af JB |
731 | |
732 | /* new, potentially un-ordered, ampdu frame - process it */ | |
733 | ||
734 | /* reset session timer */ | |
735 | if (tid_agg_rx->timeout) | |
736 | mod_timer(&tid_agg_rx->session_timer, | |
737 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
738 | ||
739 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
740 | sc = le16_to_cpu(hdr->seq_ctrl); | |
741 | if (sc & IEEE80211_SCTL_FRAG) { | |
742 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
743 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); | |
744 | dev_kfree_skb(skb); | |
2569a826 | 745 | return; |
1edfb1af JB |
746 | } |
747 | ||
2569a826 JB |
748 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) |
749 | return; | |
750 | ||
751 | dont_reorder: | |
752 | __skb_queue_tail(frames, skb); | |
1edfb1af | 753 | } |
33b64eb2 | 754 | |
49461622 | 755 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 756 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 757 | { |
a7767f95 | 758 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
759 | |
760 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
761 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 762 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 763 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 764 | hdr->seq_ctrl)) { |
5cf121c3 | 765 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
766 | rx->local->dot11FrameDuplicateCount++; |
767 | rx->sta->num_duplicates++; | |
768 | } | |
e4c26add | 769 | return RX_DROP_MONITOR; |
571ecf67 | 770 | } else |
5cf121c3 | 771 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
772 | } |
773 | ||
571ecf67 JB |
774 | if (unlikely(rx->skb->len < 16)) { |
775 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 776 | return RX_DROP_MONITOR; |
571ecf67 JB |
777 | } |
778 | ||
571ecf67 JB |
779 | /* Drop disallowed frame classes based on STA auth/assoc state; |
780 | * IEEE 802.11, Chap 5.5. | |
781 | * | |
ccd7b362 JB |
782 | * mac80211 filters only based on association state, i.e. it drops |
783 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
784 | * deauth/disassoc frames when needed. In addition, hostapd is |
785 | * responsible for filtering on both auth and assoc states. | |
786 | */ | |
33b64eb2 | 787 | |
902acc78 | 788 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 789 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 790 | |
a7767f95 HH |
791 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
792 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 793 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 794 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
795 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
796 | !ieee80211_has_tods(hdr->frame_control) && | |
797 | ieee80211_is_data(hdr->frame_control)) || | |
798 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
799 | /* Drop IBSS frames and frames for other hosts |
800 | * silently. */ | |
e4c26add | 801 | return RX_DROP_MONITOR; |
571ecf67 JB |
802 | } |
803 | ||
e4c26add | 804 | return RX_DROP_MONITOR; |
571ecf67 JB |
805 | } |
806 | ||
9ae54c84 | 807 | return RX_CONTINUE; |
570bd537 JB |
808 | } |
809 | ||
810 | ||
49461622 | 811 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 812 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 813 | { |
eb9fb5b8 JB |
814 | struct sk_buff *skb = rx->skb; |
815 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
816 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
817 | int keyidx; |
818 | int hdrlen; | |
e4c26add | 819 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 820 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 821 | int mmie_keyidx = -1; |
570bd537 | 822 | |
3017b80b JB |
823 | /* |
824 | * Key selection 101 | |
825 | * | |
3cfcf6ac | 826 | * There are four types of keys: |
3017b80b | 827 | * - GTK (group keys) |
3cfcf6ac | 828 | * - IGTK (group keys for management frames) |
3017b80b JB |
829 | * - PTK (pairwise keys) |
830 | * - STK (station-to-station pairwise keys) | |
831 | * | |
832 | * When selecting a key, we have to distinguish between multicast | |
833 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
834 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
835 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
836 | * unicast frames can also use key indices like GTKs. Hence, if we | |
837 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 838 | * |
8dc06a1c JB |
839 | * Note that in a regular BSS, multicast frames are sent by the |
840 | * AP only, associated stations unicast the frame to the AP first | |
841 | * which then multicasts it on their behalf. | |
842 | * | |
3017b80b JB |
843 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
844 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
845 | * The spec seems to expect that one negotiates the same key with |
846 | * every station but there's no such requirement; VLANs could be | |
847 | * possible. | |
3017b80b JB |
848 | */ |
849 | ||
3017b80b | 850 | /* |
1990af8d | 851 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
852 | * addressed to us nor a multicast frame. |
853 | */ | |
5cf121c3 | 854 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 855 | return RX_CONTINUE; |
3017b80b | 856 | |
2569a826 JB |
857 | /* start without a key */ |
858 | rx->key = NULL; | |
859 | ||
d4e46a3d JB |
860 | if (rx->sta) |
861 | stakey = rcu_dereference(rx->sta->key); | |
862 | ||
0c7c10c7 JM |
863 | if (!ieee80211_has_protected(hdr->frame_control)) |
864 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
865 | ||
d4e46a3d JB |
866 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
867 | rx->key = stakey; | |
0c7c10c7 JM |
868 | /* Skip decryption if the frame is not protected. */ |
869 | if (!ieee80211_has_protected(hdr->frame_control)) | |
870 | return RX_CONTINUE; | |
3cfcf6ac JM |
871 | } else if (mmie_keyidx >= 0) { |
872 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
873 | if ((status->flag & RX_FLAG_DECRYPTED) && |
874 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
875 | return RX_CONTINUE; |
876 | ||
877 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
878 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
879 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
880 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
881 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
882 | /* | |
883 | * The frame was not protected, so skip decryption. However, we | |
884 | * need to set rx->key if there is a key that could have been | |
885 | * used so that the frame may be dropped if encryption would | |
886 | * have been expected. | |
887 | */ | |
888 | struct ieee80211_key *key = NULL; | |
889 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
890 | is_multicast_ether_addr(hdr->addr1) && | |
891 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
892 | rx->key = key; | |
893 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
894 | rx->key = key; | |
895 | return RX_CONTINUE; | |
571ecf67 | 896 | } else { |
3017b80b JB |
897 | /* |
898 | * The device doesn't give us the IV so we won't be | |
899 | * able to look up the key. That's ok though, we | |
900 | * don't need to decrypt the frame, we just won't | |
901 | * be able to keep statistics accurate. | |
902 | * Except for key threshold notifications, should | |
903 | * we somehow allow the driver to tell us which key | |
904 | * the hardware used if this flag is set? | |
905 | */ | |
eb9fb5b8 JB |
906 | if ((status->flag & RX_FLAG_DECRYPTED) && |
907 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 908 | return RX_CONTINUE; |
3017b80b | 909 | |
a7767f95 | 910 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
911 | |
912 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 913 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
914 | |
915 | /* | |
916 | * no need to call ieee80211_wep_get_keyidx, | |
917 | * it verifies a bunch of things we've done already | |
918 | */ | |
919 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
920 | ||
d4e46a3d | 921 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
922 | |
923 | /* | |
924 | * RSNA-protected unicast frames should always be sent with | |
925 | * pairwise or station-to-station keys, but for WEP we allow | |
926 | * using a key index as well. | |
927 | */ | |
8f20fc24 | 928 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
929 | !is_multicast_ether_addr(hdr->addr1)) |
930 | rx->key = NULL; | |
571ecf67 JB |
931 | } |
932 | ||
3017b80b | 933 | if (rx->key) { |
571ecf67 | 934 | rx->key->tx_rx_count++; |
011bfcc4 | 935 | /* TODO: add threshold stuff again */ |
1990af8d | 936 | } else { |
e4c26add | 937 | return RX_DROP_MONITOR; |
70f08765 JB |
938 | } |
939 | ||
e3cf8b3f ZY |
940 | if (skb_linearize(rx->skb)) |
941 | return RX_DROP_UNUSABLE; | |
942 | ||
1990af8d JB |
943 | /* Check for weak IVs if possible */ |
944 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 945 | ieee80211_is_data(hdr->frame_control) && |
eb9fb5b8 JB |
946 | (!(status->flag & RX_FLAG_IV_STRIPPED) || |
947 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
948 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
949 | rx->sta->wep_weak_iv_count++; | |
950 | ||
70f08765 JB |
951 | switch (rx->key->conf.alg) { |
952 | case ALG_WEP: | |
e2f036da MN |
953 | result = ieee80211_crypto_wep_decrypt(rx); |
954 | break; | |
70f08765 | 955 | case ALG_TKIP: |
e2f036da MN |
956 | result = ieee80211_crypto_tkip_decrypt(rx); |
957 | break; | |
70f08765 | 958 | case ALG_CCMP: |
e2f036da MN |
959 | result = ieee80211_crypto_ccmp_decrypt(rx); |
960 | break; | |
3cfcf6ac JM |
961 | case ALG_AES_CMAC: |
962 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
963 | break; | |
70f08765 JB |
964 | } |
965 | ||
e2f036da | 966 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 967 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
968 | |
969 | return result; | |
70f08765 JB |
970 | } |
971 | ||
572e0012 KV |
972 | static ieee80211_rx_result debug_noinline |
973 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
974 | { | |
975 | struct ieee80211_local *local; | |
976 | struct ieee80211_hdr *hdr; | |
977 | struct sk_buff *skb; | |
978 | ||
979 | local = rx->local; | |
980 | skb = rx->skb; | |
981 | hdr = (struct ieee80211_hdr *) skb->data; | |
982 | ||
983 | if (!local->pspolling) | |
984 | return RX_CONTINUE; | |
985 | ||
986 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
987 | /* this is not from AP */ | |
988 | return RX_CONTINUE; | |
989 | ||
990 | if (!ieee80211_is_data(hdr->frame_control)) | |
991 | return RX_CONTINUE; | |
992 | ||
993 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
994 | /* AP has no more frames buffered for us */ | |
995 | local->pspolling = false; | |
996 | return RX_CONTINUE; | |
997 | } | |
998 | ||
999 | /* more data bit is set, let's request a new frame from the AP */ | |
1000 | ieee80211_send_pspoll(local, rx->sdata); | |
1001 | ||
1002 | return RX_CONTINUE; | |
1003 | } | |
1004 | ||
133b8226 | 1005 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 1006 | { |
133b8226 | 1007 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 1008 | struct ieee80211_local *local = sdata->local; |
0795af57 | 1009 | |
3e122be0 | 1010 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 1011 | set_sta_flags(sta, WLAN_STA_PS_STA); |
12375ef9 | 1012 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 1013 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1014 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
47846c9b | 1015 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 JB |
1016 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1017 | } | |
1018 | ||
ff9458d3 | 1019 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 1020 | { |
133b8226 | 1021 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 1022 | |
3e122be0 | 1023 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 1024 | |
af818581 | 1025 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
004c872e | 1026 | |
571ecf67 | 1027 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 | 1028 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
47846c9b | 1029 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1030 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 1031 | |
af818581 | 1032 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 1033 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 | 1034 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
47846c9b | 1035 | sdata->name, sta->sta.addr, sta->sta.aid); |
571ecf67 | 1036 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
1037 | return; |
1038 | } | |
1039 | ||
1040 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
1041 | } |
1042 | ||
49461622 | 1043 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1044 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1045 | { |
1046 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
1047 | struct sk_buff *skb = rx->skb; |
1048 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1049 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
1050 | |
1051 | if (!sta) | |
9ae54c84 | 1052 | return RX_CONTINUE; |
571ecf67 | 1053 | |
b291ba11 JB |
1054 | /* |
1055 | * Update last_rx only for IBSS packets which are for the current | |
1056 | * BSSID to avoid keeping the current IBSS network alive in cases | |
1057 | * where other STAs start using different BSSID. | |
1058 | */ | |
05c914fe | 1059 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 1060 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 1061 | NL80211_IFTYPE_ADHOC); |
46900298 | 1062 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 1063 | sta->last_rx = jiffies; |
b291ba11 JB |
1064 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
1065 | /* | |
33b64eb2 LCC |
1066 | * Mesh beacons will update last_rx when if they are found to |
1067 | * match the current local configuration when processed. | |
571ecf67 | 1068 | */ |
b291ba11 | 1069 | sta->last_rx = jiffies; |
571ecf67 JB |
1070 | } |
1071 | ||
5cf121c3 | 1072 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 1073 | return RX_CONTINUE; |
571ecf67 | 1074 | |
3cf335d5 KV |
1075 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
1076 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
1077 | ||
571ecf67 JB |
1078 | sta->rx_fragments++; |
1079 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 | 1080 | sta->last_signal = status->signal; |
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 | ||
e3cf8b3f ZY |
1243 | if (skb_linearize(rx->skb)) |
1244 | return RX_DROP_UNUSABLE; | |
1245 | ||
571ecf67 JB |
1246 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
1247 | ||
1248 | if (frag == 0) { | |
1249 | /* This is the first fragment of a new frame. */ | |
1250 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1251 | rx->queue, &(rx->skb)); |
8f20fc24 | 1252 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1253 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1254 | /* Store CCMP PN so that we can verify that the next |
1255 | * fragment has a sequential PN value. */ | |
1256 | entry->ccmp = 1; | |
1257 | memcpy(entry->last_pn, | |
5cf121c3 | 1258 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1259 | CCMP_PN_LEN); |
1260 | } | |
9ae54c84 | 1261 | return RX_QUEUED; |
571ecf67 JB |
1262 | } |
1263 | ||
1264 | /* This is a fragment for a frame that should already be pending in | |
1265 | * fragment cache. Add this fragment to the end of the pending entry. | |
1266 | */ | |
b73d70ad | 1267 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1268 | if (!entry) { |
1269 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1270 | return RX_DROP_MONITOR; |
571ecf67 JB |
1271 | } |
1272 | ||
1273 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1274 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1275 | if (entry->ccmp) { | |
1276 | int i; | |
1277 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1278 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1279 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1280 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1281 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1282 | pn[i]++; | |
1283 | if (pn[i]) | |
1284 | break; | |
1285 | } | |
5cf121c3 | 1286 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1287 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1288 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1289 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1290 | } | |
1291 | ||
358c8d9d | 1292 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1293 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1294 | entry->last_frag = frag; | |
1295 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1296 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1297 | rx->skb = NULL; |
9ae54c84 | 1298 | return RX_QUEUED; |
571ecf67 JB |
1299 | } |
1300 | ||
1301 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1302 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1303 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1304 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1305 | GFP_ATOMIC))) { | |
1306 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1307 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1308 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1309 | } |
1310 | } | |
1311 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1312 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1313 | dev_kfree_skb(skb); | |
1314 | } | |
1315 | ||
1316 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1317 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1318 | |
1319 | out: | |
1320 | if (rx->sta) | |
1321 | rx->sta->rx_packets++; | |
1322 | if (is_multicast_ether_addr(hdr->addr1)) | |
1323 | rx->local->dot11MulticastReceivedFrameCount++; | |
1324 | else | |
1325 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1326 | return RX_CONTINUE; |
571ecf67 JB |
1327 | } |
1328 | ||
49461622 | 1329 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1330 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1331 | { |
af818581 | 1332 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1333 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1334 | |
358c8d9d | 1335 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1336 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1337 | return RX_CONTINUE; |
571ecf67 | 1338 | |
05c914fe JB |
1339 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1340 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1341 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1342 | |
af818581 JB |
1343 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1344 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1345 | else | |
1346 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1347 | |
9ae54c84 | 1348 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1349 | * count as an dropped frame. */ |
1350 | dev_kfree_skb(rx->skb); | |
1351 | ||
9ae54c84 | 1352 | return RX_QUEUED; |
571ecf67 JB |
1353 | } |
1354 | ||
49461622 | 1355 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1356 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1357 | { |
6e0d114d | 1358 | u8 *data = rx->skb->data; |
238f74a2 | 1359 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1360 | |
238f74a2 | 1361 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1362 | return RX_CONTINUE; |
6e0d114d JB |
1363 | |
1364 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1365 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1366 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1367 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1368 | /* change frame type to non QOS */ |
238f74a2 | 1369 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1370 | |
9ae54c84 | 1371 | return RX_CONTINUE; |
6e0d114d JB |
1372 | } |
1373 | ||
76ee65bf | 1374 | static int |
5cf121c3 | 1375 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1376 | { |
07346f81 | 1377 | if (unlikely(!rx->sta || |
f4ea83dd | 1378 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1379 | return -EACCES; |
571ecf67 | 1380 | |
76ee65bf | 1381 | return 0; |
571ecf67 JB |
1382 | } |
1383 | ||
76ee65bf | 1384 | static int |
358c8d9d | 1385 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1386 | { |
eb9fb5b8 JB |
1387 | struct sk_buff *skb = rx->skb; |
1388 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1389 | ||
3017b80b | 1390 | /* |
7848ba7d JB |
1391 | * Pass through unencrypted frames if the hardware has |
1392 | * decrypted them already. | |
3017b80b | 1393 | */ |
eb9fb5b8 | 1394 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1395 | return 0; |
571ecf67 JB |
1396 | |
1397 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1398 | if (unlikely(!ieee80211_has_protected(fc) && |
1399 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1400 | ieee80211_is_data(fc) && |
b3fc9c6c | 1401 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1402 | return -EACCES; |
bef5d1c7 JB |
1403 | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | static int | |
1408 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) | |
1409 | { | |
1410 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
e3efca0a | 1411 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
bef5d1c7 | 1412 | __le16 fc = hdr->frame_control; |
bef5d1c7 | 1413 | |
e3efca0a JM |
1414 | /* |
1415 | * Pass through unencrypted frames if the hardware has | |
1416 | * decrypted them already. | |
1417 | */ | |
1418 | if (status->flag & RX_FLAG_DECRYPTED) | |
1419 | return 0; | |
bef5d1c7 | 1420 | |
f2ca3ea4 JM |
1421 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1422 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1423 | rx->key)) | |
1424 | return -EACCES; | |
1425 | /* BIP does not use Protected field, so need to check MMIE */ | |
f64f9e71 | 1426 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
fa83a218 | 1427 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) |
f2ca3ea4 JM |
1428 | return -EACCES; |
1429 | /* | |
1430 | * When using MFP, Action frames are not allowed prior to | |
1431 | * having configured keys. | |
1432 | */ | |
1433 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1434 | ieee80211_is_robust_mgmt_frame( | |
1435 | (struct ieee80211_hdr *) rx->skb->data))) | |
1436 | return -EACCES; | |
1437 | } | |
b3fc9c6c | 1438 | |
76ee65bf | 1439 | return 0; |
571ecf67 JB |
1440 | } |
1441 | ||
76ee65bf | 1442 | static int |
e31a16d6 | 1443 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1444 | { |
eb9fb5b8 | 1445 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
f14543ee FF |
1446 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1447 | ||
9bc383de JB |
1448 | if (ieee80211_has_a4(hdr->frame_control) && |
1449 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1450 | return -1; |
9bc383de JB |
1451 | |
1452 | if (is_multicast_ether_addr(hdr->addr1) && | |
1453 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1454 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1455 | return -1; |
571ecf67 | 1456 | |
47846c9b | 1457 | return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
76ee65bf | 1458 | } |
571ecf67 | 1459 | |
ce3edf6d JB |
1460 | /* |
1461 | * requires that rx->skb is a frame with ethernet header | |
1462 | */ | |
358c8d9d | 1463 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1464 | { |
c97c23e3 | 1465 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1466 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1467 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1468 | ||
1469 | /* | |
1470 | * Allow EAPOL frames to us/the PAE group address regardless | |
1471 | * of whether the frame was encrypted or not. | |
1472 | */ | |
1473 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
47846c9b | 1474 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
ce3edf6d JB |
1475 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1476 | return true; | |
1477 | ||
1478 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1479 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1480 | return false; |
1481 | ||
1482 | return true; | |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * requires that rx->skb is a frame with ethernet header | |
1487 | */ | |
76ee65bf | 1488 | static void |
5cf121c3 | 1489 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1490 | { |
eb9fb5b8 JB |
1491 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1492 | struct net_device *dev = sdata->dev; | |
76ee65bf | 1493 | struct sk_buff *skb, *xmit_skb; |
ce3edf6d JB |
1494 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1495 | struct sta_info *dsta; | |
571ecf67 | 1496 | |
76ee65bf RR |
1497 | skb = rx->skb; |
1498 | xmit_skb = NULL; | |
571ecf67 | 1499 | |
05c914fe JB |
1500 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1501 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1502 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
9bc383de JB |
1503 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
1504 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
ce3edf6d JB |
1505 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1506 | /* | |
1507 | * send multicast frames both to higher layers in | |
1508 | * local net stack and back to the wireless medium | |
1509 | */ | |
76ee65bf RR |
1510 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1511 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1512 | printk(KERN_DEBUG "%s: failed to clone " |
1513 | "multicast frame\n", dev->name); | |
1514 | } else { | |
abe60632 JB |
1515 | dsta = sta_info_get(sdata, skb->data); |
1516 | if (dsta) { | |
ce3edf6d JB |
1517 | /* |
1518 | * The destination station is associated to | |
1519 | * this AP (in this VLAN), so send the frame | |
1520 | * directly to it and do not pass it to local | |
1521 | * net stack. | |
571ecf67 | 1522 | */ |
76ee65bf | 1523 | xmit_skb = skb; |
571ecf67 JB |
1524 | skb = NULL; |
1525 | } | |
571ecf67 JB |
1526 | } |
1527 | } | |
1528 | ||
1529 | if (skb) { | |
d1c3a37c JB |
1530 | int align __maybe_unused; |
1531 | ||
59d9cb07 | 1532 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
d1c3a37c JB |
1533 | /* |
1534 | * 'align' will only take the values 0 or 2 here | |
1535 | * since all frames are required to be aligned | |
1536 | * to 2-byte boundaries when being passed to | |
1537 | * mac80211. That also explains the __skb_push() | |
1538 | * below. | |
1539 | */ | |
dacb6f1d | 1540 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1541 | if (align) { |
1542 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1543 | dev_kfree_skb(skb); | |
1544 | skb = NULL; | |
1545 | } else { | |
1546 | u8 *data = skb->data; | |
8ce0b589 ZY |
1547 | size_t len = skb_headlen(skb); |
1548 | skb->data -= align; | |
1549 | memmove(skb->data, data, len); | |
1550 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1551 | } |
1552 | } | |
1553 | #endif | |
1554 | ||
1555 | if (skb) { | |
1556 | /* deliver to local stack */ | |
1557 | skb->protocol = eth_type_trans(skb, dev); | |
1558 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1559 | netif_rx(skb); | |
1560 | } | |
571ecf67 JB |
1561 | } |
1562 | ||
76ee65bf | 1563 | if (xmit_skb) { |
571ecf67 | 1564 | /* send to wireless media */ |
f831e909 | 1565 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1566 | skb_reset_network_header(xmit_skb); |
1567 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1568 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1569 | } |
76ee65bf RR |
1570 | } |
1571 | ||
49461622 | 1572 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1573 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1574 | { |
eb9fb5b8 | 1575 | struct net_device *dev = rx->sdata->dev; |
eaf85ca7 | 1576 | struct sk_buff *skb = rx->skb; |
358c8d9d HH |
1577 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1578 | __le16 fc = hdr->frame_control; | |
eaf85ca7 | 1579 | struct sk_buff_head frame_list; |
fd4c7f2f | 1580 | |
358c8d9d | 1581 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1582 | return RX_CONTINUE; |
fd4c7f2f | 1583 | |
358c8d9d | 1584 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1585 | return RX_DROP_MONITOR; |
fd4c7f2f | 1586 | |
5cf121c3 | 1587 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1588 | return RX_CONTINUE; |
fd4c7f2f | 1589 | |
eaf85ca7 ZY |
1590 | if (ieee80211_has_a4(hdr->frame_control) && |
1591 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1592 | !rx->sdata->u.vlan.sta) | |
e4c26add | 1593 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1594 | |
eaf85ca7 ZY |
1595 | if (is_multicast_ether_addr(hdr->addr1) && |
1596 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1597 | rx->sdata->u.vlan.sta) || | |
1598 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && | |
1599 | rx->sdata->u.mgd.use_4addr))) | |
e4c26add | 1600 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1601 | |
eaf85ca7 ZY |
1602 | skb->dev = dev; |
1603 | __skb_queue_head_init(&frame_list); | |
fd4c7f2f | 1604 | |
e3cf8b3f ZY |
1605 | if (skb_linearize(skb)) |
1606 | return RX_DROP_UNUSABLE; | |
1607 | ||
eaf85ca7 ZY |
1608 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
1609 | rx->sdata->vif.type, | |
1610 | rx->local->hw.extra_tx_headroom); | |
fd4c7f2f | 1611 | |
eaf85ca7 ZY |
1612 | while (!skb_queue_empty(&frame_list)) { |
1613 | rx->skb = __skb_dequeue(&frame_list); | |
fd4c7f2f | 1614 | |
358c8d9d | 1615 | if (!ieee80211_frame_allowed(rx, fc)) { |
eaf85ca7 | 1616 | dev_kfree_skb(rx->skb); |
ce3edf6d JB |
1617 | continue; |
1618 | } | |
eaf85ca7 ZY |
1619 | dev->stats.rx_packets++; |
1620 | dev->stats.rx_bytes += rx->skb->len; | |
fd4c7f2f RR |
1621 | |
1622 | ieee80211_deliver_skb(rx); | |
1623 | } | |
1624 | ||
9ae54c84 | 1625 | return RX_QUEUED; |
fd4c7f2f RR |
1626 | } |
1627 | ||
bf94e17b | 1628 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1629 | static ieee80211_rx_result |
e32f85f7 LCC |
1630 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1631 | { | |
1632 | struct ieee80211_hdr *hdr; | |
1633 | struct ieee80211s_hdr *mesh_hdr; | |
1634 | unsigned int hdrlen; | |
1635 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1636 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1637 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e32f85f7 LCC |
1638 | |
1639 | hdr = (struct ieee80211_hdr *) skb->data; | |
1640 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1641 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1642 | ||
1643 | if (!ieee80211_is_data(hdr->frame_control)) | |
1644 | return RX_CONTINUE; | |
1645 | ||
1646 | if (!mesh_hdr->ttl) | |
1647 | /* illegal frame */ | |
1648 | return RX_DROP_MONITOR; | |
1649 | ||
43b7b314 | 1650 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1651 | struct mesh_path *mppath; |
43b7b314 JC |
1652 | char *proxied_addr; |
1653 | char *mpp_addr; | |
1654 | ||
1655 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1656 | mpp_addr = hdr->addr3; | |
1657 | proxied_addr = mesh_hdr->eaddr1; | |
1658 | } else { | |
1659 | mpp_addr = hdr->addr4; | |
1660 | proxied_addr = mesh_hdr->eaddr2; | |
1661 | } | |
79617dee | 1662 | |
79617dee | 1663 | rcu_read_lock(); |
43b7b314 | 1664 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1665 | if (!mppath) { |
43b7b314 | 1666 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1667 | } else { |
1668 | spin_lock_bh(&mppath->state_lock); | |
43b7b314 JC |
1669 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1670 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1671 | spin_unlock_bh(&mppath->state_lock); |
1672 | } | |
1673 | rcu_read_unlock(); | |
1674 | } | |
1675 | ||
3c5772a5 JC |
1676 | /* Frame has reached destination. Don't forward */ |
1677 | if (!is_multicast_ether_addr(hdr->addr1) && | |
47846c9b | 1678 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1679 | return RX_CONTINUE; |
1680 | ||
1681 | mesh_hdr->ttl--; | |
1682 | ||
1683 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1684 | if (!mesh_hdr->ttl) | |
472dbc45 | 1685 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1686 | dropped_frames_ttl); |
1687 | else { | |
1688 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1689 | struct ieee80211_tx_info *info; |
1690 | ||
e32f85f7 LCC |
1691 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1692 | ||
1693 | if (!fwd_skb && net_ratelimit()) | |
1694 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
47846c9b | 1695 | sdata->name); |
e32f85f7 LCC |
1696 | |
1697 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
47846c9b | 1698 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
3b8d81e0 JB |
1699 | info = IEEE80211_SKB_CB(fwd_skb); |
1700 | memset(info, 0, sizeof(*info)); | |
1701 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1702 | info->control.vif = &rx->sdata->vif; |
cf0277e7 JB |
1703 | skb_set_queue_mapping(skb, |
1704 | ieee80211_select_queue(rx->sdata, fwd_skb)); | |
1705 | ieee80211_set_qos_hdr(local, skb); | |
c8a61a7d DW |
1706 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1707 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1708 | fwded_mcast); | |
1709 | else { | |
3c5772a5 JC |
1710 | int err; |
1711 | /* | |
1712 | * Save TA to addr1 to send TA a path error if a | |
1713 | * suitable next hop is not found | |
1714 | */ | |
1715 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1716 | ETH_ALEN); |
3c5772a5 | 1717 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1718 | /* Failed to immediately resolve next hop: |
1719 | * fwded frame was dropped or will be added | |
1720 | * later to the pending skb queue. */ | |
1721 | if (err) | |
1722 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1723 | |
1724 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1725 | fwded_unicast); | |
249b405c JC |
1726 | } |
1727 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1728 | fwded_frames); | |
3b8d81e0 | 1729 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1730 | } |
1731 | } | |
1732 | ||
3c5772a5 | 1733 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1734 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1735 | return RX_CONTINUE; |
1736 | else | |
1737 | return RX_DROP_MONITOR; | |
1738 | } | |
bf94e17b | 1739 | #endif |
e32f85f7 | 1740 | |
49461622 | 1741 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1742 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1743 | { |
eb9fb5b8 | 1744 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e15276a4 | 1745 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1746 | struct net_device *dev = sdata->dev; |
358c8d9d HH |
1747 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1748 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1749 | int err; |
76ee65bf | 1750 | |
358c8d9d | 1751 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1752 | return RX_CONTINUE; |
76ee65bf | 1753 | |
358c8d9d | 1754 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1755 | return RX_DROP_MONITOR; |
76ee65bf | 1756 | |
f14543ee FF |
1757 | /* |
1758 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1759 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1760 | */ | |
1761 | if (ieee80211_has_a4(hdr->frame_control) && | |
1762 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1763 | return RX_DROP_MONITOR; | |
1764 | ||
e31a16d6 | 1765 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1766 | if (unlikely(err)) |
e4c26add | 1767 | return RX_DROP_UNUSABLE; |
76ee65bf | 1768 | |
358c8d9d | 1769 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1770 | return RX_DROP_MONITOR; |
ce3edf6d | 1771 | |
76ee65bf RR |
1772 | rx->skb->dev = dev; |
1773 | ||
1774 | dev->stats.rx_packets++; | |
1775 | dev->stats.rx_bytes += rx->skb->len; | |
1776 | ||
e15276a4 VN |
1777 | if (ieee80211_is_data(hdr->frame_control) && |
1778 | !is_multicast_ether_addr(hdr->addr1) && | |
1779 | local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) { | |
1780 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
1781 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
1782 | } | |
1783 | ||
76ee65bf | 1784 | ieee80211_deliver_skb(rx); |
571ecf67 | 1785 | |
9ae54c84 | 1786 | return RX_QUEUED; |
571ecf67 JB |
1787 | } |
1788 | ||
49461622 | 1789 | static ieee80211_rx_result debug_noinline |
2569a826 | 1790 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
71364716 RR |
1791 | { |
1792 | struct ieee80211_local *local = rx->local; | |
1793 | struct ieee80211_hw *hw = &local->hw; | |
1794 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1795 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1796 | struct tid_ampdu_rx *tid_agg_rx; |
1797 | u16 start_seq_num; | |
1798 | u16 tid; | |
1799 | ||
a7767f95 | 1800 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1801 | return RX_CONTINUE; |
71364716 | 1802 | |
a7767f95 | 1803 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1804 | if (!rx->sta) |
a02ae758 | 1805 | return RX_DROP_MONITOR; |
71364716 | 1806 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1807 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1808 | != HT_AGG_STATE_OPERATIONAL) | |
a02ae758 | 1809 | return RX_DROP_MONITOR; |
cee24a3e | 1810 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1811 | |
1812 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1813 | ||
1814 | /* reset session timer */ | |
20ad19d0 JB |
1815 | if (tid_agg_rx->timeout) |
1816 | mod_timer(&tid_agg_rx->session_timer, | |
1817 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1818 | |
a02ae758 | 1819 | /* release stored frames up to start of BAR */ |
2569a826 JB |
1820 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
1821 | frames); | |
a02ae758 JB |
1822 | kfree_skb(skb); |
1823 | return RX_QUEUED; | |
71364716 RR |
1824 | } |
1825 | ||
9ae54c84 | 1826 | return RX_CONTINUE; |
71364716 RR |
1827 | } |
1828 | ||
f4f727a6 JM |
1829 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1830 | struct ieee80211_mgmt *mgmt, | |
1831 | size_t len) | |
fea14732 JM |
1832 | { |
1833 | struct ieee80211_local *local = sdata->local; | |
1834 | struct sk_buff *skb; | |
1835 | struct ieee80211_mgmt *resp; | |
1836 | ||
47846c9b | 1837 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
fea14732 JM |
1838 | /* Not to own unicast address */ |
1839 | return; | |
1840 | } | |
1841 | ||
46900298 JB |
1842 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1843 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1844 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1845 | return; |
1846 | } | |
1847 | ||
1848 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1849 | /* Too short SA Query request frame */ | |
1850 | return; | |
1851 | } | |
1852 | ||
1853 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1854 | if (skb == NULL) | |
1855 | return; | |
1856 | ||
1857 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1858 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1859 | memset(resp, 0, 24); | |
1860 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
47846c9b | 1861 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
46900298 | 1862 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1863 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1864 | IEEE80211_STYPE_ACTION); | |
1865 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1866 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1867 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1868 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1869 | mgmt->u.action.u.sa_query.trans_id, | |
1870 | WLAN_SA_QUERY_TR_ID_LEN); | |
1871 | ||
62ae67be | 1872 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
1873 | } |
1874 | ||
de1ede7a JB |
1875 | static ieee80211_rx_result debug_noinline |
1876 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1877 | { | |
1878 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 1879 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a | 1880 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
84040805 | 1881 | struct sk_buff *nskb; |
026331c4 | 1882 | struct ieee80211_rx_status *status; |
de1ede7a JB |
1883 | int len = rx->skb->len; |
1884 | ||
1885 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1886 | return RX_CONTINUE; | |
1887 | ||
026331c4 JM |
1888 | /* drop too small frames */ |
1889 | if (len < IEEE80211_MIN_ACTION_SIZE) | |
84040805 | 1890 | return RX_DROP_UNUSABLE; |
de1ede7a | 1891 | |
026331c4 | 1892 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
84040805 | 1893 | return RX_DROP_UNUSABLE; |
de1ede7a | 1894 | |
026331c4 | 1895 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
84040805 | 1896 | return RX_DROP_UNUSABLE; |
97ebe12a | 1897 | |
bef5d1c7 | 1898 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
84040805 JB |
1899 | return RX_DROP_UNUSABLE; |
1900 | ||
de1ede7a JB |
1901 | switch (mgmt->u.action.category) { |
1902 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1903 | /* |
1904 | * The aggregation code is not prepared to handle | |
1905 | * anything but STA/AP due to the BSSID handling; | |
1906 | * IBSS could work in the code but isn't supported | |
1907 | * by drivers or the standard. | |
1908 | */ | |
1909 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1910 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1911 | sdata->vif.type != NL80211_IFTYPE_AP) | |
84040805 | 1912 | break; |
8abd3f9b | 1913 | |
026331c4 JM |
1914 | /* verify action_code is present */ |
1915 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1916 | break; | |
1917 | ||
de1ede7a JB |
1918 | switch (mgmt->u.action.u.addba_req.action_code) { |
1919 | case WLAN_ACTION_ADDBA_REQ: | |
1920 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1921 | sizeof(mgmt->u.action.u.addba_req))) | |
1922 | return RX_DROP_MONITOR; | |
1923 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
84040805 | 1924 | goto handled; |
de1ede7a JB |
1925 | case WLAN_ACTION_ADDBA_RESP: |
1926 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1927 | sizeof(mgmt->u.action.u.addba_resp))) | |
84040805 | 1928 | break; |
de1ede7a | 1929 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); |
84040805 | 1930 | goto handled; |
de1ede7a JB |
1931 | case WLAN_ACTION_DELBA: |
1932 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1933 | sizeof(mgmt->u.action.u.delba))) | |
84040805 | 1934 | break; |
de1ede7a | 1935 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); |
84040805 | 1936 | goto handled; |
de1ede7a | 1937 | } |
39192c0b JB |
1938 | break; |
1939 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1940 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
84040805 | 1941 | break; |
46900298 JB |
1942 | |
1943 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 1944 | break; |
46900298 | 1945 | |
026331c4 JM |
1946 | /* verify action_code is present */ |
1947 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1948 | break; | |
1949 | ||
39192c0b JB |
1950 | switch (mgmt->u.action.u.measurement.action_code) { |
1951 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1952 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1953 | sizeof(mgmt->u.action.u.measurement))) | |
84040805 | 1954 | break; |
39192c0b | 1955 | ieee80211_process_measurement_req(sdata, mgmt, len); |
84040805 | 1956 | goto handled; |
c481ec97 S |
1957 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1958 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1959 | sizeof(mgmt->u.action.u.chan_switch))) | |
84040805 | 1960 | break; |
c481ec97 | 1961 | |
cc32abd4 | 1962 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
84040805 | 1963 | break; |
cc32abd4 | 1964 | |
46900298 | 1965 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
84040805 | 1966 | break; |
c481ec97 | 1967 | |
77fdaa12 | 1968 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1969 | } |
1970 | break; | |
fea14732 JM |
1971 | case WLAN_CATEGORY_SA_QUERY: |
1972 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1973 | sizeof(mgmt->u.action.u.sa_query))) | |
84040805 JB |
1974 | break; |
1975 | ||
fea14732 JM |
1976 | switch (mgmt->u.action.u.sa_query.action) { |
1977 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1978 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
84040805 | 1979 | break; |
fea14732 | 1980 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
84040805 | 1981 | goto handled; |
fea14732 JM |
1982 | } |
1983 | break; | |
84040805 | 1984 | } |
026331c4 | 1985 | |
84040805 JB |
1986 | /* |
1987 | * For AP mode, hostapd is responsible for handling any action | |
1988 | * frames that we didn't handle, including returning unknown | |
1989 | * ones. For all other modes we will return them to the sender, | |
1990 | * setting the 0x80 bit in the action category, as required by | |
1991 | * 802.11-2007 7.3.1.11. | |
1992 | */ | |
1993 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
1994 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
1995 | return RX_DROP_MONITOR; | |
d7907448 | 1996 | |
026331c4 JM |
1997 | /* |
1998 | * Getting here means the kernel doesn't know how to handle | |
1999 | * it, but maybe userspace does ... include returned frames | |
2000 | * so userspace can register for those to know whether ones | |
2001 | * it transmitted were processed or returned. | |
2002 | */ | |
2003 | status = IEEE80211_SKB_RXCB(rx->skb); | |
2004 | ||
2005 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
2006 | cfg80211_rx_action(rx->sdata->dev, status->freq, | |
2007 | rx->skb->data, rx->skb->len, | |
2008 | GFP_ATOMIC)) | |
2009 | goto handled; | |
2010 | ||
84040805 JB |
2011 | /* do not return rejected action frames */ |
2012 | if (mgmt->u.action.category & 0x80) | |
2013 | return RX_DROP_UNUSABLE; | |
2014 | ||
2015 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, | |
2016 | GFP_ATOMIC); | |
2017 | if (nskb) { | |
2018 | struct ieee80211_mgmt *mgmt = (void *)nskb->data; | |
2019 | ||
2020 | mgmt->u.action.category |= 0x80; | |
2021 | memcpy(mgmt->da, mgmt->sa, ETH_ALEN); | |
2022 | memcpy(mgmt->sa, rx->sdata->vif.addr, ETH_ALEN); | |
2023 | ||
2024 | memset(nskb->cb, 0, sizeof(nskb->cb)); | |
2025 | ||
2026 | ieee80211_tx_skb(rx->sdata, nskb); | |
de1ede7a JB |
2027 | } |
2028 | ||
84040805 | 2029 | handled: |
026331c4 JM |
2030 | if (rx->sta) |
2031 | rx->sta->rx_packets++; | |
39192c0b JB |
2032 | dev_kfree_skb(rx->skb); |
2033 | return RX_QUEUED; | |
de1ede7a JB |
2034 | } |
2035 | ||
49461622 | 2036 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 2037 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 2038 | { |
eb9fb5b8 | 2039 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
af6b6374 | 2040 | ieee80211_rx_result rxs; |
571ecf67 | 2041 | |
5cf121c3 | 2042 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 2043 | return RX_DROP_MONITOR; |
571ecf67 | 2044 | |
bef5d1c7 JB |
2045 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
2046 | return RX_DROP_UNUSABLE; | |
97ebe12a | 2047 | |
af6b6374 JB |
2048 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
2049 | if (rxs != RX_CONTINUE) | |
2050 | return rxs; | |
2051 | ||
472dbc45 | 2052 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 2053 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 2054 | |
3832c287 | 2055 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 2056 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 2057 | |
7986cf95 | 2058 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 2059 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 2060 | |
7986cf95 | 2061 | return RX_DROP_MONITOR; |
571ecf67 JB |
2062 | } |
2063 | ||
3b8d81e0 | 2064 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 2065 | struct ieee80211_rx_data *rx) |
571ecf67 | 2066 | { |
a7767f95 HH |
2067 | int keyidx; |
2068 | unsigned int hdrlen; | |
571ecf67 | 2069 | |
a7767f95 | 2070 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
2071 | if (rx->skb->len >= hdrlen + 4) |
2072 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
2073 | else | |
2074 | keyidx = -1; | |
2075 | ||
8944b79f | 2076 | if (!rx->sta) { |
aa0daf0e JB |
2077 | /* |
2078 | * Some hardware seem to generate incorrect Michael MIC | |
2079 | * reports; ignore them to avoid triggering countermeasures. | |
2080 | */ | |
af2ced6a | 2081 | return; |
571ecf67 JB |
2082 | } |
2083 | ||
a7767f95 | 2084 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 2085 | return; |
571ecf67 | 2086 | |
05c914fe | 2087 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
2088 | /* |
2089 | * APs with pairwise keys should never receive Michael MIC | |
2090 | * errors for non-zero keyidx because these are reserved for | |
2091 | * group keys and only the AP is sending real multicast | |
2092 | * frames in the BSS. | |
2093 | */ | |
af2ced6a | 2094 | return; |
571ecf67 JB |
2095 | } |
2096 | ||
a7767f95 HH |
2097 | if (!ieee80211_is_data(hdr->frame_control) && |
2098 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 2099 | return; |
571ecf67 | 2100 | |
e6d6e342 JB |
2101 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
2102 | GFP_ATOMIC); | |
571ecf67 JB |
2103 | } |
2104 | ||
5cf121c3 | 2105 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
2106 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
2107 | struct ieee80211_rate *rate) | |
3d30d949 MW |
2108 | { |
2109 | struct ieee80211_sub_if_data *sdata; | |
2110 | struct ieee80211_local *local = rx->local; | |
2111 | struct ieee80211_rtap_hdr { | |
2112 | struct ieee80211_radiotap_header hdr; | |
2113 | u8 flags; | |
5f0b7de5 | 2114 | u8 rate_or_pad; |
3d30d949 MW |
2115 | __le16 chan_freq; |
2116 | __le16 chan_flags; | |
2117 | } __attribute__ ((packed)) *rthdr; | |
2118 | struct sk_buff *skb = rx->skb, *skb2; | |
2119 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 2120 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 2121 | |
8c0c709e | 2122 | if (status->flag & RX_FLAG_INTERNAL_CMTR) |
3d30d949 MW |
2123 | goto out_free_skb; |
2124 | ||
2125 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
2126 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
2127 | goto out_free_skb; | |
2128 | ||
2129 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
2130 | memset(rthdr, 0, sizeof(*rthdr)); | |
2131 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
2132 | rthdr->hdr.it_present = | |
2133 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
2134 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
2135 | ||
5f0b7de5 JB |
2136 | if (rate) { |
2137 | rthdr->rate_or_pad = rate->bitrate / 5; | |
2138 | rthdr->hdr.it_present |= | |
2139 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
2140 | } | |
3d30d949 MW |
2141 | rthdr->chan_freq = cpu_to_le16(status->freq); |
2142 | ||
2143 | if (status->band == IEEE80211_BAND_5GHZ) | |
2144 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
2145 | IEEE80211_CHAN_5GHZ); | |
2146 | else | |
2147 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
2148 | IEEE80211_CHAN_2GHZ); | |
2149 | ||
2150 | skb_set_mac_header(skb, 0); | |
2151 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2152 | skb->pkt_type = PACKET_OTHERHOST; | |
2153 | skb->protocol = htons(ETH_P_802_2); | |
2154 | ||
2155 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2156 | if (!ieee80211_sdata_running(sdata)) |
3d30d949 MW |
2157 | continue; |
2158 | ||
05c914fe | 2159 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
2160 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
2161 | continue; | |
2162 | ||
2163 | if (prev_dev) { | |
2164 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2165 | if (skb2) { | |
2166 | skb2->dev = prev_dev; | |
2167 | netif_rx(skb2); | |
2168 | } | |
2169 | } | |
2170 | ||
2171 | prev_dev = sdata->dev; | |
2172 | sdata->dev->stats.rx_packets++; | |
2173 | sdata->dev->stats.rx_bytes += skb->len; | |
2174 | } | |
2175 | ||
2176 | if (prev_dev) { | |
2177 | skb->dev = prev_dev; | |
2178 | netif_rx(skb); | |
2179 | skb = NULL; | |
2180 | } else | |
2181 | goto out_free_skb; | |
2182 | ||
8c0c709e | 2183 | status->flag |= RX_FLAG_INTERNAL_CMTR; |
3d30d949 MW |
2184 | return; |
2185 | ||
2186 | out_free_skb: | |
2187 | dev_kfree_skb(skb); | |
2188 | } | |
2189 | ||
571ecf67 | 2190 | |
8944b79f | 2191 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2192 | struct ieee80211_rx_data *rx, |
5f0b7de5 JB |
2193 | struct sk_buff *skb, |
2194 | struct ieee80211_rate *rate) | |
58905290 | 2195 | { |
2569a826 | 2196 | struct sk_buff_head reorder_release; |
58905290 JB |
2197 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2198 | ||
2569a826 JB |
2199 | __skb_queue_head_init(&reorder_release); |
2200 | ||
8944b79f JB |
2201 | rx->skb = skb; |
2202 | rx->sdata = sdata; | |
8944b79f | 2203 | |
e32f85f7 LCC |
2204 | #define CALL_RXH(rxh) \ |
2205 | do { \ | |
2206 | res = rxh(rx); \ | |
2207 | if (res != RX_CONTINUE) \ | |
2569a826 | 2208 | goto rxh_next; \ |
e32f85f7 | 2209 | } while (0); |
49461622 | 2210 | |
2569a826 JB |
2211 | /* |
2212 | * NB: the rxh_next label works even if we jump | |
2213 | * to it from here because then the list will | |
2214 | * be empty, which is a trivial check | |
2215 | */ | |
49461622 JB |
2216 | CALL_RXH(ieee80211_rx_h_passive_scan) |
2217 | CALL_RXH(ieee80211_rx_h_check) | |
2569a826 JB |
2218 | |
2219 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); | |
2220 | ||
2221 | while ((skb = __skb_dequeue(&reorder_release))) { | |
2222 | /* | |
2223 | * all the other fields are valid across frames | |
2224 | * that belong to an aMPDU since they are on the | |
2225 | * same TID from the same station | |
2226 | */ | |
2227 | rx->skb = skb; | |
2228 | ||
2229 | CALL_RXH(ieee80211_rx_h_decrypt) | |
2230 | CALL_RXH(ieee80211_rx_h_check_more_data) | |
2231 | CALL_RXH(ieee80211_rx_h_sta_process) | |
2232 | CALL_RXH(ieee80211_rx_h_defragment) | |
2233 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2234 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2235 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2236 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2237 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2238 | #ifdef CONFIG_MAC80211_MESH |
2569a826 JB |
2239 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2240 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2241 | #endif |
2569a826 JB |
2242 | CALL_RXH(ieee80211_rx_h_data) |
2243 | ||
2244 | /* special treatment -- needs the queue */ | |
2245 | res = ieee80211_rx_h_ctrl(rx, &reorder_release); | |
2246 | if (res != RX_CONTINUE) | |
2247 | goto rxh_next; | |
2248 | ||
2249 | CALL_RXH(ieee80211_rx_h_action) | |
2250 | CALL_RXH(ieee80211_rx_h_mgmt) | |
49461622 JB |
2251 | |
2252 | #undef CALL_RXH | |
2253 | ||
2569a826 JB |
2254 | rxh_next: |
2255 | switch (res) { | |
2256 | case RX_DROP_MONITOR: | |
2257 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2258 | if (rx->sta) | |
2259 | rx->sta->rx_dropped++; | |
2260 | /* fall through */ | |
2261 | case RX_CONTINUE: | |
2262 | ieee80211_rx_cooked_monitor(rx, rate); | |
2263 | break; | |
2264 | case RX_DROP_UNUSABLE: | |
2265 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); | |
2266 | if (rx->sta) | |
2267 | rx->sta->rx_dropped++; | |
2268 | dev_kfree_skb(rx->skb); | |
2269 | break; | |
2270 | case RX_QUEUED: | |
2271 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2272 | break; | |
2273 | } | |
58905290 JB |
2274 | } |
2275 | } | |
2276 | ||
571ecf67 JB |
2277 | /* main receive path */ |
2278 | ||
23a24def | 2279 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2280 | struct ieee80211_rx_data *rx, |
23a24def JB |
2281 | struct ieee80211_hdr *hdr) |
2282 | { | |
eb9fb5b8 JB |
2283 | struct sk_buff *skb = rx->skb; |
2284 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2285 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2286 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2287 | ||
51fb61e7 | 2288 | switch (sdata->vif.type) { |
05c914fe | 2289 | case NL80211_IFTYPE_STATION: |
9bc383de | 2290 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2291 | return 0; |
77fdaa12 | 2292 | if (!multicast && |
47846c9b | 2293 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
4150c572 | 2294 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2295 | return 0; |
5cf121c3 | 2296 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2297 | } |
2298 | break; | |
05c914fe | 2299 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2300 | if (!bssid) |
2301 | return 0; | |
a7767f95 | 2302 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2303 | return 1; |
87291c02 | 2304 | } |
46900298 | 2305 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2306 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2307 | return 0; |
5cf121c3 | 2308 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2309 | } else if (!multicast && |
47846c9b | 2310 | compare_ether_addr(sdata->vif.addr, |
23a24def | 2311 | hdr->addr1) != 0) { |
4150c572 | 2312 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2313 | return 0; |
5cf121c3 | 2314 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2315 | } else if (!rx->sta) { |
2316 | int rate_idx; | |
eb9fb5b8 | 2317 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2318 | rate_idx = 0; /* TODO: HT rates */ |
2319 | else | |
eb9fb5b8 | 2320 | rate_idx = status->rate_idx; |
34e89507 JB |
2321 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
2322 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); | |
0fb8ca45 | 2323 | } |
23a24def | 2324 | break; |
05c914fe | 2325 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 | 2326 | if (!multicast && |
47846c9b | 2327 | compare_ether_addr(sdata->vif.addr, |
6032f934 JB |
2328 | hdr->addr1) != 0) { |
2329 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2330 | return 0; | |
2331 | ||
5cf121c3 | 2332 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2333 | } |
2334 | break; | |
05c914fe JB |
2335 | case NL80211_IFTYPE_AP_VLAN: |
2336 | case NL80211_IFTYPE_AP: | |
23a24def | 2337 | if (!bssid) { |
47846c9b | 2338 | if (compare_ether_addr(sdata->vif.addr, |
23a24def JB |
2339 | hdr->addr1)) |
2340 | return 0; | |
2341 | } else if (!ieee80211_bssid_match(bssid, | |
47846c9b | 2342 | sdata->vif.addr)) { |
5cf121c3 | 2343 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2344 | return 0; |
5cf121c3 | 2345 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2346 | } |
23a24def | 2347 | break; |
05c914fe | 2348 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2349 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2350 | return 0; |
2351 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2352 | return 0; | |
2353 | break; | |
05c914fe | 2354 | case NL80211_IFTYPE_MONITOR: |
05c914fe JB |
2355 | case NL80211_IFTYPE_UNSPECIFIED: |
2356 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2357 | /* should never get here */ |
2358 | WARN_ON(1); | |
2359 | break; | |
23a24def JB |
2360 | } |
2361 | ||
2362 | return 1; | |
2363 | } | |
2364 | ||
571ecf67 | 2365 | /* |
6368e4b1 RR |
2366 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2367 | * be called with rcu_read_lock protection. | |
571ecf67 | 2368 | */ |
71ebb4aa RR |
2369 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2370 | struct sk_buff *skb, | |
8318d78a | 2371 | struct ieee80211_rate *rate) |
571ecf67 | 2372 | { |
f1d58c25 | 2373 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2374 | struct ieee80211_local *local = hw_to_local(hw); |
2375 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2376 | struct ieee80211_hdr *hdr; |
e3cf8b3f | 2377 | __le16 fc; |
5cf121c3 | 2378 | struct ieee80211_rx_data rx; |
6368e4b1 | 2379 | int prepares; |
8e6f0032 JB |
2380 | struct ieee80211_sub_if_data *prev = NULL; |
2381 | struct sk_buff *skb_new; | |
abe60632 JB |
2382 | struct sta_info *sta, *tmp; |
2383 | bool found_sta = false; | |
e3cf8b3f | 2384 | int err = 0; |
571ecf67 | 2385 | |
e3cf8b3f | 2386 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
571ecf67 JB |
2387 | memset(&rx, 0, sizeof(rx)); |
2388 | rx.skb = skb; | |
2389 | rx.local = local; | |
72abd81b | 2390 | |
e3cf8b3f | 2391 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
571ecf67 | 2392 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2393 | |
142b9f50 HS |
2394 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2395 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2396 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2397 | |
e3cf8b3f ZY |
2398 | if (ieee80211_is_mgmt(fc)) |
2399 | err = skb_linearize(skb); | |
2400 | else | |
2401 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); | |
2402 | ||
2403 | if (err) { | |
2404 | dev_kfree_skb(skb); | |
2405 | return; | |
2406 | } | |
2407 | ||
2408 | hdr = (struct ieee80211_hdr *)skb->data; | |
38f3714d | 2409 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2410 | ieee80211_verify_alignment(&rx); |
38f3714d | 2411 | |
e3cf8b3f | 2412 | if (ieee80211_is_data(fc)) { |
abe60632 JB |
2413 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
2414 | rx.sta = sta; | |
2415 | found_sta = true; | |
2416 | rx.sdata = sta->sdata; | |
2417 | ||
2418 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2419 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
2420 | if (prepares) { | |
2421 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2422 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2423 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2424 | } else | |
2425 | prev = rx.sdata; | |
2426 | } | |
af2ced6a | 2427 | } |
abe60632 JB |
2428 | } |
2429 | if (!found_sta) { | |
2430 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
9607e6b6 | 2431 | if (!ieee80211_sdata_running(sdata)) |
abe60632 | 2432 | continue; |
2a8a9a88 | 2433 | |
abe60632 JB |
2434 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2435 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
2436 | continue; | |
b2e7771e | 2437 | |
abe60632 JB |
2438 | /* |
2439 | * frame is destined for this interface, but if it's | |
2440 | * not also for the previous one we handle that after | |
2441 | * the loop to avoid copying the SKB once too much | |
2442 | */ | |
340e11f3 | 2443 | |
abe60632 JB |
2444 | if (!prev) { |
2445 | prev = sdata; | |
2446 | continue; | |
2447 | } | |
340e11f3 | 2448 | |
4754ffd6 | 2449 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2450 | |
2451 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2452 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2453 | ||
2454 | if (!prepares) | |
2455 | goto next; | |
2456 | ||
2457 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2458 | rx.sdata = prev; | |
2459 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2460 | ieee80211_rx_michael_mic_report(hdr, | |
2461 | &rx); | |
2462 | goto next; | |
2463 | } | |
2464 | ||
abe60632 JB |
2465 | /* |
2466 | * frame was destined for the previous interface | |
2467 | * so invoke RX handlers for it | |
2468 | */ | |
2469 | ||
2470 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2471 | if (!skb_new) { | |
2472 | if (net_ratelimit()) | |
2473 | printk(KERN_DEBUG "%s: failed to copy " | |
2474 | "multicast frame for %s\n", | |
2475 | wiphy_name(local->hw.wiphy), | |
47846c9b | 2476 | prev->name); |
4bb29f8c | 2477 | goto next; |
abe60632 JB |
2478 | } |
2479 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate); | |
4bb29f8c | 2480 | next: |
abe60632 | 2481 | prev = sdata; |
340e11f3 | 2482 | } |
4bb29f8c FF |
2483 | |
2484 | if (prev) { | |
4754ffd6 | 2485 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
4bb29f8c FF |
2486 | |
2487 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2488 | prepares = prepare_for_handlers(prev, &rx, hdr); | |
2489 | ||
2490 | if (!prepares) | |
2491 | prev = NULL; | |
2492 | } | |
571ecf67 | 2493 | } |
a4b7d7bd | 2494 | if (prev) |
5f0b7de5 | 2495 | ieee80211_invoke_rx_handlers(prev, &rx, skb, rate); |
a4b7d7bd | 2496 | else |
8e6f0032 | 2497 | dev_kfree_skb(skb); |
571ecf67 | 2498 | } |
6368e4b1 RR |
2499 | |
2500 | /* | |
2501 | * This is the receive path handler. It is called by a low level driver when an | |
2502 | * 802.11 MPDU is received from the hardware. | |
2503 | */ | |
103bf9f7 | 2504 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2505 | { |
2506 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2507 | struct ieee80211_rate *rate = NULL; |
2508 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2509 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2510 | |
d20ef63d JB |
2511 | WARN_ON_ONCE(softirq_count() == 0); |
2512 | ||
77a980dc JB |
2513 | if (WARN_ON(status->band < 0 || |
2514 | status->band >= IEEE80211_NUM_BANDS)) | |
2515 | goto drop; | |
8318d78a JB |
2516 | |
2517 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2518 | if (WARN_ON(!sband)) |
2519 | goto drop; | |
8318d78a | 2520 | |
89c3a8ac JB |
2521 | /* |
2522 | * If we're suspending, it is possible although not too likely | |
2523 | * that we'd be receiving frames after having already partially | |
2524 | * quiesced the stack. We can't process such frames then since | |
2525 | * that might, for example, cause stations to be added or other | |
2526 | * driver callbacks be invoked. | |
2527 | */ | |
77a980dc JB |
2528 | if (unlikely(local->quiescing || local->suspended)) |
2529 | goto drop; | |
89c3a8ac | 2530 | |
ea77f12f JB |
2531 | /* |
2532 | * The same happens when we're not even started, | |
2533 | * but that's worth a warning. | |
2534 | */ | |
77a980dc JB |
2535 | if (WARN_ON(!local->started)) |
2536 | goto drop; | |
ea77f12f | 2537 | |
0fb8ca45 | 2538 | if (status->flag & RX_FLAG_HT) { |
e5d6eb83 LR |
2539 | /* |
2540 | * rate_idx is MCS index, which can be [0-76] as documented on: | |
2541 | * | |
2542 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2543 | * | |
2544 | * Anything else would be some sort of driver or hardware error. | |
2545 | * The driver should catch hardware errors. | |
2546 | */ | |
2547 | if (WARN((status->rate_idx < 0 || | |
2548 | status->rate_idx > 76), | |
2549 | "Rate marked as an HT rate but passed " | |
2550 | "status->rate_idx is not " | |
2551 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2552 | status->rate_idx, | |
2553 | status->rate_idx)) | |
77a980dc | 2554 | goto drop; |
0fb8ca45 JM |
2555 | } else { |
2556 | if (WARN_ON(status->rate_idx < 0 || | |
2557 | status->rate_idx >= sband->n_bitrates)) | |
77a980dc | 2558 | goto drop; |
0fb8ca45 JM |
2559 | rate = &sband->bitrates[status->rate_idx]; |
2560 | } | |
6368e4b1 RR |
2561 | |
2562 | /* | |
2563 | * key references and virtual interfaces are protected using RCU | |
2564 | * and this requires that we are in a read-side RCU section during | |
2565 | * receive processing | |
2566 | */ | |
2567 | rcu_read_lock(); | |
2568 | ||
2569 | /* | |
2570 | * Frames with failed FCS/PLCP checksum are not returned, | |
2571 | * all other frames are returned without radiotap header | |
2572 | * if it was previously present. | |
2573 | * Also, frames with less than 16 bytes are dropped. | |
2574 | */ | |
f1d58c25 | 2575 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2576 | if (!skb) { |
2577 | rcu_read_unlock(); | |
2578 | return; | |
2579 | } | |
2580 | ||
2569a826 | 2581 | __ieee80211_rx_handle_packet(hw, skb, rate); |
6368e4b1 RR |
2582 | |
2583 | rcu_read_unlock(); | |
77a980dc JB |
2584 | |
2585 | return; | |
2586 | drop: | |
2587 | kfree_skb(skb); | |
6368e4b1 | 2588 | } |
103bf9f7 | 2589 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2590 | |
2591 | /* This is a version of the rx handler that can be called from hard irq | |
2592 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2593 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2594 | { |
2595 | struct ieee80211_local *local = hw_to_local(hw); | |
2596 | ||
2597 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2598 | ||
571ecf67 JB |
2599 | skb->pkt_type = IEEE80211_RX_MSG; |
2600 | skb_queue_tail(&local->skb_queue, skb); | |
2601 | tasklet_schedule(&local->tasklet); | |
2602 | } | |
2603 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |