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> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
a02ae758 JB |
30 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, |
31 | struct tid_ampdu_rx *tid_agg_rx, | |
32 | u16 head_seq_num); | |
33 | ||
b2e7771e JB |
34 | /* |
35 | * monitor mode reception | |
36 | * | |
37 | * This function cleans up the SKB, i.e. it removes all the stuff | |
38 | * only useful for monitoring. | |
39 | */ | |
40 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 41 | struct sk_buff *skb) |
b2e7771e | 42 | { |
b2e7771e JB |
43 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
44 | if (likely(skb->len > FCS_LEN)) | |
45 | skb_trim(skb, skb->len - FCS_LEN); | |
46 | else { | |
47 | /* driver bug */ | |
48 | WARN_ON(1); | |
49 | dev_kfree_skb(skb); | |
50 | skb = NULL; | |
51 | } | |
52 | } | |
53 | ||
54 | return skb; | |
55 | } | |
56 | ||
f1d58c25 | 57 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 58 | int present_fcs_len) |
b2e7771e | 59 | { |
f1d58c25 | 60 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 61 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
62 | |
63 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
64 | return 1; | |
0869aea0 | 65 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 66 | return 1; |
87228f57 HH |
67 | if (ieee80211_is_ctl(hdr->frame_control) && |
68 | !ieee80211_is_pspoll(hdr->frame_control) && | |
69 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
70 | return 1; |
71 | return 0; | |
72 | } | |
73 | ||
601ae7f2 BR |
74 | static int |
75 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
76 | struct ieee80211_rx_status *status) | |
77 | { | |
78 | int len; | |
79 | ||
80 | /* always present fields */ | |
81 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
82 | ||
83 | if (status->flag & RX_FLAG_TSFT) | |
84 | len += 8; | |
7fee5372 | 85 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
86 | len += 1; |
87 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
88 | len += 1; | |
89 | ||
90 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
91 | len++; | |
92 | ||
601ae7f2 BR |
93 | return len; |
94 | } | |
95 | ||
d1c3a37c | 96 | /* |
601ae7f2 BR |
97 | * ieee80211_add_rx_radiotap_header - add radiotap header |
98 | * | |
99 | * add a radiotap header containing all the fields which the hardware provided. | |
100 | */ | |
101 | static void | |
102 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
103 | struct sk_buff *skb, | |
601ae7f2 BR |
104 | struct ieee80211_rate *rate, |
105 | int rtap_len) | |
106 | { | |
f1d58c25 | 107 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
108 | struct ieee80211_radiotap_header *rthdr; |
109 | unsigned char *pos; | |
6a86b9c7 | 110 | u16 rx_flags = 0; |
601ae7f2 BR |
111 | |
112 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
113 | memset(rthdr, 0, rtap_len); | |
114 | ||
115 | /* radiotap header, set always present flags */ | |
116 | rthdr->it_present = | |
117 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
118 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
119 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
120 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
121 | rthdr->it_len = cpu_to_le16(rtap_len); | |
122 | ||
123 | pos = (unsigned char *)(rthdr+1); | |
124 | ||
125 | /* the order of the following fields is important */ | |
126 | ||
127 | /* IEEE80211_RADIOTAP_TSFT */ | |
128 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 129 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
130 | rthdr->it_present |= |
131 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
132 | pos += 8; | |
133 | } | |
134 | ||
135 | /* IEEE80211_RADIOTAP_FLAGS */ | |
136 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
137 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
138 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
139 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
140 | if (status->flag & RX_FLAG_SHORTPRE) |
141 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
142 | pos++; |
143 | ||
144 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
145 | if (status->flag & RX_FLAG_HT) { |
146 | /* | |
147 | * TODO: add following information into radiotap header once | |
148 | * suitable fields are defined for it: | |
149 | * - MCS index (status->rate_idx) | |
150 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
151 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
152 | */ | |
153 | *pos = 0; | |
8d6f658e | 154 | } else { |
ebe6c7ba | 155 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 156 | *pos = rate->bitrate / 5; |
8d6f658e | 157 | } |
601ae7f2 BR |
158 | pos++; |
159 | ||
160 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 161 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
162 | pos += 2; |
163 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
164 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
165 | pos); | |
5f0b7de5 JB |
166 | else if (status->flag & RX_FLAG_HT) |
167 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, | |
168 | pos); | |
9deb1ae5 | 169 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
170 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
171 | pos); | |
601ae7f2 | 172 | else |
6a86b9c7 JB |
173 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
174 | pos); | |
601ae7f2 BR |
175 | pos += 2; |
176 | ||
177 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
178 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
179 | *pos = status->signal; | |
180 | rthdr->it_present |= | |
181 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
182 | pos++; | |
183 | } | |
184 | ||
185 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
186 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
187 | *pos = status->noise; | |
188 | rthdr->it_present |= | |
189 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
190 | pos++; | |
191 | } | |
192 | ||
193 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
194 | ||
195 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
196 | *pos = status->antenna; | |
197 | pos++; | |
198 | ||
601ae7f2 BR |
199 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
200 | ||
201 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
202 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 203 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 204 | pos++; |
aae89831 | 205 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
206 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
207 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
208 | pos += 2; |
209 | } | |
210 | ||
b2e7771e JB |
211 | /* |
212 | * This function copies a received frame to all monitor interfaces and | |
213 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
214 | * radiotap header the driver might have added. | |
215 | */ | |
216 | static struct sk_buff * | |
217 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 218 | struct ieee80211_rate *rate) |
b2e7771e | 219 | { |
f1d58c25 | 220 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 221 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 222 | int needed_headroom = 0; |
b2e7771e JB |
223 | struct sk_buff *skb, *skb2; |
224 | struct net_device *prev_dev = NULL; | |
225 | int present_fcs_len = 0; | |
b2e7771e JB |
226 | |
227 | /* | |
228 | * First, we may need to make a copy of the skb because | |
229 | * (1) we need to modify it for radiotap (if not present), and | |
230 | * (2) the other RX handlers will modify the skb we got. | |
231 | * | |
232 | * We don't need to, of course, if we aren't going to return | |
233 | * the SKB because it has a bad FCS/PLCP checksum. | |
234 | */ | |
0869aea0 JB |
235 | |
236 | /* room for the radiotap header based on driver features */ | |
237 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
238 | |
239 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
240 | present_fcs_len = FCS_LEN; | |
241 | ||
242 | if (!local->monitors) { | |
0869aea0 | 243 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
244 | dev_kfree_skb(origskb); |
245 | return NULL; | |
246 | } | |
247 | ||
0869aea0 | 248 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
249 | } |
250 | ||
0869aea0 | 251 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
252 | /* only need to expand headroom if necessary */ |
253 | skb = origskb; | |
254 | origskb = NULL; | |
255 | ||
256 | /* | |
257 | * This shouldn't trigger often because most devices have an | |
258 | * RX header they pull before we get here, and that should | |
259 | * be big enough for our radiotap information. We should | |
260 | * probably export the length to drivers so that we can have | |
261 | * them allocate enough headroom to start with. | |
262 | */ | |
263 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 264 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
265 | dev_kfree_skb(skb); |
266 | return NULL; | |
267 | } | |
268 | } else { | |
269 | /* | |
270 | * Need to make a copy and possibly remove radiotap header | |
271 | * and FCS from the original. | |
272 | */ | |
273 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
274 | ||
0869aea0 | 275 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
276 | |
277 | if (!skb) | |
278 | return origskb; | |
279 | } | |
280 | ||
0869aea0 JB |
281 | /* prepend radiotap information */ |
282 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 283 | |
ce3edf6d | 284 | skb_reset_mac_header(skb); |
b2e7771e JB |
285 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
286 | skb->pkt_type = PACKET_OTHERHOST; | |
287 | skb->protocol = htons(ETH_P_802_2); | |
288 | ||
289 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
290 | if (!netif_running(sdata->dev)) | |
291 | continue; | |
292 | ||
05c914fe | 293 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
294 | continue; |
295 | ||
3d30d949 MW |
296 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
297 | continue; | |
298 | ||
b2e7771e JB |
299 | if (prev_dev) { |
300 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
301 | if (skb2) { | |
302 | skb2->dev = prev_dev; | |
303 | netif_rx(skb2); | |
304 | } | |
305 | } | |
306 | ||
307 | prev_dev = sdata->dev; | |
308 | sdata->dev->stats.rx_packets++; | |
309 | sdata->dev->stats.rx_bytes += skb->len; | |
310 | } | |
311 | ||
312 | if (prev_dev) { | |
313 | skb->dev = prev_dev; | |
314 | netif_rx(skb); | |
315 | } else | |
316 | dev_kfree_skb(skb); | |
317 | ||
318 | return origskb; | |
319 | } | |
320 | ||
321 | ||
5cf121c3 | 322 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 323 | { |
238f74a2 | 324 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
325 | int tid; |
326 | ||
327 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
328 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
329 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 330 | /* frame has qos control */ |
238f74a2 HH |
331 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
332 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 333 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 334 | else |
5cf121c3 | 335 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 336 | } else { |
1411f9b5 JB |
337 | /* |
338 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
339 | * | |
340 | * Sequence numbers for management frames, QoS data | |
341 | * frames with a broadcast/multicast address in the | |
342 | * Address 1 field, and all non-QoS data frames sent | |
343 | * by QoS STAs are assigned using an additional single | |
344 | * modulo-4096 counter, [...] | |
345 | * | |
346 | * We also use that counter for non-QoS STAs. | |
347 | */ | |
348 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 349 | } |
52865dfd | 350 | |
5cf121c3 | 351 | rx->queue = tid; |
6e0d114d JB |
352 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
353 | * For now, set skb->priority to 0 for other cases. */ | |
354 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 355 | } |
6e0d114d | 356 | |
d1c3a37c JB |
357 | /** |
358 | * DOC: Packet alignment | |
359 | * | |
360 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
361 | * to the stack. | |
362 | * | |
363 | * Additionally, should, if possible, align the payload data in a way that | |
364 | * guarantees that the contained IP header is aligned to a four-byte | |
365 | * boundary. In the case of regular frames, this simply means aligning the | |
366 | * payload to a four-byte boundary (because either the IP header is directly | |
367 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
368 | * in front of it). | |
369 | * | |
370 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
371 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
372 | * push the IP header further back to a multiple of four again. Thankfully, the | |
373 | * specs were sane enough this time around to require padding each A-MSDU | |
374 | * subframe to a length that is a multiple of four. | |
375 | * | |
376 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
377 | * the payload is not supported, the driver is required to move the 802.11 | |
378 | * header to be directly in front of the payload in that case. | |
379 | */ | |
380 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 381 | { |
a7767f95 | 382 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
383 | int hdrlen; |
384 | ||
d1c3a37c JB |
385 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
386 | return; | |
387 | #endif | |
388 | ||
389 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
390 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
391 | return; | |
392 | ||
a7767f95 | 393 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
394 | return; |
395 | ||
a7767f95 | 396 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 397 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 398 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
399 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
400 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
401 | } |
402 | ||
6368e4b1 | 403 | |
571ecf67 JB |
404 | /* rx handlers */ |
405 | ||
49461622 | 406 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 407 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
408 | { |
409 | struct ieee80211_local *local = rx->local; | |
410 | struct sk_buff *skb = rx->skb; | |
411 | ||
fbe9c429 | 412 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 413 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 414 | |
142b9f50 HS |
415 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
416 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 417 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 418 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 419 | dev_kfree_skb(skb); |
9ae54c84 | 420 | return RX_QUEUED; |
571ecf67 JB |
421 | } |
422 | ||
5cf121c3 | 423 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
424 | /* scanning finished during invoking of handlers */ |
425 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 426 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
427 | } |
428 | ||
9ae54c84 | 429 | return RX_CONTINUE; |
571ecf67 JB |
430 | } |
431 | ||
3cfcf6ac JM |
432 | |
433 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
434 | { | |
435 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
436 | ||
437 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
438 | return 0; | |
439 | ||
440 | return ieee80211_is_robust_mgmt_frame(hdr); | |
441 | } | |
442 | ||
443 | ||
444 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
445 | { | |
446 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
447 | ||
448 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
449 | return 0; | |
450 | ||
451 | return ieee80211_is_robust_mgmt_frame(hdr); | |
452 | } | |
453 | ||
454 | ||
455 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
456 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
457 | { | |
458 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
459 | struct ieee80211_mmie *mmie; | |
460 | ||
461 | if (skb->len < 24 + sizeof(*mmie) || | |
462 | !is_multicast_ether_addr(hdr->da)) | |
463 | return -1; | |
464 | ||
465 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
466 | return -1; /* not a robust management frame */ | |
467 | ||
468 | mmie = (struct ieee80211_mmie *) | |
469 | (skb->data + skb->len - sizeof(*mmie)); | |
470 | if (mmie->element_id != WLAN_EID_MMIE || | |
471 | mmie->length != sizeof(*mmie) - 2) | |
472 | return -1; | |
473 | ||
474 | return le16_to_cpu(mmie->key_id); | |
475 | } | |
476 | ||
477 | ||
33b64eb2 | 478 | static ieee80211_rx_result |
5cf121c3 | 479 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 480 | { |
a7767f95 HH |
481 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
482 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
eb9fb5b8 | 483 | char *dev_addr = rx->sdata->dev->dev_addr; |
d6d1a5a7 | 484 | |
a7767f95 | 485 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
486 | if (is_multicast_ether_addr(hdr->addr1)) { |
487 | if (ieee80211_has_tods(hdr->frame_control) || | |
488 | !ieee80211_has_fromds(hdr->frame_control)) | |
489 | return RX_DROP_MONITOR; | |
490 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
491 | return RX_DROP_MONITOR; | |
492 | } else { | |
493 | if (!ieee80211_has_a4(hdr->frame_control)) | |
494 | return RX_DROP_MONITOR; | |
495 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
496 | return RX_DROP_MONITOR; | |
497 | } | |
33b64eb2 LCC |
498 | } |
499 | ||
500 | /* If there is not an established peer link and this is not a peer link | |
501 | * establisment frame, beacon or probe, drop the frame. | |
502 | */ | |
503 | ||
b4e08ea1 | 504 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 505 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 506 | |
a7767f95 | 507 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
508 | return RX_DROP_MONITOR; |
509 | ||
a7767f95 | 510 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 | 511 | mgmt = (struct ieee80211_mgmt *)hdr; |
0938393f | 512 | if (mgmt->u.action.category != MESH_PLINK_CATEGORY) |
33b64eb2 | 513 | return RX_DROP_MONITOR; |
33b64eb2 | 514 | return RX_CONTINUE; |
33b64eb2 LCC |
515 | } |
516 | ||
a7767f95 HH |
517 | if (ieee80211_is_probe_req(hdr->frame_control) || |
518 | ieee80211_is_probe_resp(hdr->frame_control) || | |
519 | ieee80211_is_beacon(hdr->frame_control)) | |
520 | return RX_CONTINUE; | |
521 | ||
522 | return RX_DROP_MONITOR; | |
523 | ||
524 | } | |
525 | ||
526 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
527 | ||
528 | if (ieee80211_is_data(hdr->frame_control) && | |
529 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 530 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 531 | return RX_DROP_MONITOR; |
902acc78 | 532 | #undef msh_h_get |
d6d1a5a7 | 533 | |
902acc78 JB |
534 | return RX_CONTINUE; |
535 | } | |
33b64eb2 LCC |
536 | |
537 | ||
49461622 | 538 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 539 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 540 | { |
a7767f95 | 541 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
542 | |
543 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
544 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 545 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 546 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 547 | hdr->seq_ctrl)) { |
5cf121c3 | 548 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
549 | rx->local->dot11FrameDuplicateCount++; |
550 | rx->sta->num_duplicates++; | |
551 | } | |
e4c26add | 552 | return RX_DROP_MONITOR; |
571ecf67 | 553 | } else |
5cf121c3 | 554 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
555 | } |
556 | ||
571ecf67 JB |
557 | if (unlikely(rx->skb->len < 16)) { |
558 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 559 | return RX_DROP_MONITOR; |
571ecf67 JB |
560 | } |
561 | ||
571ecf67 JB |
562 | /* Drop disallowed frame classes based on STA auth/assoc state; |
563 | * IEEE 802.11, Chap 5.5. | |
564 | * | |
ccd7b362 JB |
565 | * mac80211 filters only based on association state, i.e. it drops |
566 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
567 | * deauth/disassoc frames when needed. In addition, hostapd is |
568 | * responsible for filtering on both auth and assoc states. | |
569 | */ | |
33b64eb2 | 570 | |
902acc78 | 571 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 572 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 573 | |
a7767f95 HH |
574 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
575 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 576 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 577 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
578 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
579 | !ieee80211_has_tods(hdr->frame_control) && | |
580 | ieee80211_is_data(hdr->frame_control)) || | |
581 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
582 | /* Drop IBSS frames and frames for other hosts |
583 | * silently. */ | |
e4c26add | 584 | return RX_DROP_MONITOR; |
571ecf67 JB |
585 | } |
586 | ||
e4c26add | 587 | return RX_DROP_MONITOR; |
571ecf67 JB |
588 | } |
589 | ||
9ae54c84 | 590 | return RX_CONTINUE; |
570bd537 JB |
591 | } |
592 | ||
593 | ||
49461622 | 594 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 595 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 596 | { |
eb9fb5b8 JB |
597 | struct sk_buff *skb = rx->skb; |
598 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
599 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
3017b80b JB |
600 | int keyidx; |
601 | int hdrlen; | |
e4c26add | 602 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 603 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 604 | int mmie_keyidx = -1; |
570bd537 | 605 | |
3017b80b JB |
606 | /* |
607 | * Key selection 101 | |
608 | * | |
3cfcf6ac | 609 | * There are four types of keys: |
3017b80b | 610 | * - GTK (group keys) |
3cfcf6ac | 611 | * - IGTK (group keys for management frames) |
3017b80b JB |
612 | * - PTK (pairwise keys) |
613 | * - STK (station-to-station pairwise keys) | |
614 | * | |
615 | * When selecting a key, we have to distinguish between multicast | |
616 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
617 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
618 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
619 | * unicast frames can also use key indices like GTKs. Hence, if we | |
620 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 621 | * |
8dc06a1c JB |
622 | * Note that in a regular BSS, multicast frames are sent by the |
623 | * AP only, associated stations unicast the frame to the AP first | |
624 | * which then multicasts it on their behalf. | |
625 | * | |
3017b80b JB |
626 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
627 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
628 | * The spec seems to expect that one negotiates the same key with |
629 | * every station but there's no such requirement; VLANs could be | |
630 | * possible. | |
3017b80b JB |
631 | */ |
632 | ||
3017b80b | 633 | /* |
1990af8d | 634 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
635 | * addressed to us nor a multicast frame. |
636 | */ | |
5cf121c3 | 637 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 638 | return RX_CONTINUE; |
3017b80b | 639 | |
d4e46a3d JB |
640 | if (rx->sta) |
641 | stakey = rcu_dereference(rx->sta->key); | |
642 | ||
0c7c10c7 JM |
643 | if (!ieee80211_has_protected(hdr->frame_control)) |
644 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
645 | ||
d4e46a3d JB |
646 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
647 | rx->key = stakey; | |
0c7c10c7 JM |
648 | /* Skip decryption if the frame is not protected. */ |
649 | if (!ieee80211_has_protected(hdr->frame_control)) | |
650 | return RX_CONTINUE; | |
3cfcf6ac JM |
651 | } else if (mmie_keyidx >= 0) { |
652 | /* Broadcast/multicast robust management frame / BIP */ | |
eb9fb5b8 JB |
653 | if ((status->flag & RX_FLAG_DECRYPTED) && |
654 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
3cfcf6ac JM |
655 | return RX_CONTINUE; |
656 | ||
657 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
658 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
659 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
660 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
661 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
662 | /* | |
663 | * The frame was not protected, so skip decryption. However, we | |
664 | * need to set rx->key if there is a key that could have been | |
665 | * used so that the frame may be dropped if encryption would | |
666 | * have been expected. | |
667 | */ | |
668 | struct ieee80211_key *key = NULL; | |
669 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
670 | is_multicast_ether_addr(hdr->addr1) && | |
671 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
672 | rx->key = key; | |
673 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
674 | rx->key = key; | |
675 | return RX_CONTINUE; | |
571ecf67 | 676 | } else { |
3017b80b JB |
677 | /* |
678 | * The device doesn't give us the IV so we won't be | |
679 | * able to look up the key. That's ok though, we | |
680 | * don't need to decrypt the frame, we just won't | |
681 | * be able to keep statistics accurate. | |
682 | * Except for key threshold notifications, should | |
683 | * we somehow allow the driver to tell us which key | |
684 | * the hardware used if this flag is set? | |
685 | */ | |
eb9fb5b8 JB |
686 | if ((status->flag & RX_FLAG_DECRYPTED) && |
687 | (status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 688 | return RX_CONTINUE; |
3017b80b | 689 | |
a7767f95 | 690 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
691 | |
692 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 693 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
694 | |
695 | /* | |
696 | * no need to call ieee80211_wep_get_keyidx, | |
697 | * it verifies a bunch of things we've done already | |
698 | */ | |
699 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
700 | ||
d4e46a3d | 701 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
702 | |
703 | /* | |
704 | * RSNA-protected unicast frames should always be sent with | |
705 | * pairwise or station-to-station keys, but for WEP we allow | |
706 | * using a key index as well. | |
707 | */ | |
8f20fc24 | 708 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
709 | !is_multicast_ether_addr(hdr->addr1)) |
710 | rx->key = NULL; | |
571ecf67 JB |
711 | } |
712 | ||
3017b80b | 713 | if (rx->key) { |
571ecf67 | 714 | rx->key->tx_rx_count++; |
011bfcc4 | 715 | /* TODO: add threshold stuff again */ |
1990af8d | 716 | } else { |
e4c26add | 717 | return RX_DROP_MONITOR; |
70f08765 JB |
718 | } |
719 | ||
1990af8d JB |
720 | /* Check for weak IVs if possible */ |
721 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 722 | ieee80211_is_data(hdr->frame_control) && |
eb9fb5b8 JB |
723 | (!(status->flag & RX_FLAG_IV_STRIPPED) || |
724 | !(status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
725 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
726 | rx->sta->wep_weak_iv_count++; | |
727 | ||
70f08765 JB |
728 | switch (rx->key->conf.alg) { |
729 | case ALG_WEP: | |
e2f036da MN |
730 | result = ieee80211_crypto_wep_decrypt(rx); |
731 | break; | |
70f08765 | 732 | case ALG_TKIP: |
e2f036da MN |
733 | result = ieee80211_crypto_tkip_decrypt(rx); |
734 | break; | |
70f08765 | 735 | case ALG_CCMP: |
e2f036da MN |
736 | result = ieee80211_crypto_ccmp_decrypt(rx); |
737 | break; | |
3cfcf6ac JM |
738 | case ALG_AES_CMAC: |
739 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
740 | break; | |
70f08765 JB |
741 | } |
742 | ||
e2f036da | 743 | /* either the frame has been decrypted or will be dropped */ |
eb9fb5b8 | 744 | status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
745 | |
746 | return result; | |
70f08765 JB |
747 | } |
748 | ||
572e0012 KV |
749 | static ieee80211_rx_result debug_noinline |
750 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
751 | { | |
752 | struct ieee80211_local *local; | |
753 | struct ieee80211_hdr *hdr; | |
754 | struct sk_buff *skb; | |
755 | ||
756 | local = rx->local; | |
757 | skb = rx->skb; | |
758 | hdr = (struct ieee80211_hdr *) skb->data; | |
759 | ||
760 | if (!local->pspolling) | |
761 | return RX_CONTINUE; | |
762 | ||
763 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
764 | /* this is not from AP */ | |
765 | return RX_CONTINUE; | |
766 | ||
767 | if (!ieee80211_is_data(hdr->frame_control)) | |
768 | return RX_CONTINUE; | |
769 | ||
770 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
771 | /* AP has no more frames buffered for us */ | |
772 | local->pspolling = false; | |
773 | return RX_CONTINUE; | |
774 | } | |
775 | ||
776 | /* more data bit is set, let's request a new frame from the AP */ | |
777 | ieee80211_send_pspoll(local, rx->sdata); | |
778 | ||
779 | return RX_CONTINUE; | |
780 | } | |
781 | ||
133b8226 | 782 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 783 | { |
133b8226 | 784 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 785 | struct ieee80211_local *local = sdata->local; |
0795af57 | 786 | |
3e122be0 | 787 | atomic_inc(&sdata->bss->num_sta_ps); |
af818581 | 788 | set_sta_flags(sta, WLAN_STA_PS_STA); |
24487981 | 789 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 790 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
791 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
792 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
793 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
794 | } | |
795 | ||
ff9458d3 | 796 | static void ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 797 | { |
133b8226 | 798 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
571ecf67 | 799 | |
3e122be0 | 800 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 801 | |
af818581 | 802 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
004c872e | 803 | |
571ecf67 | 804 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
805 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
806 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 807 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 808 | |
af818581 | 809 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
571ecf67 | 810 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
af818581 JB |
811 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
812 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 813 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
af818581 JB |
814 | return; |
815 | } | |
816 | ||
817 | ieee80211_sta_ps_deliver_wakeup(sta); | |
571ecf67 JB |
818 | } |
819 | ||
49461622 | 820 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 821 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
822 | { |
823 | struct sta_info *sta = rx->sta; | |
eb9fb5b8 JB |
824 | struct sk_buff *skb = rx->skb; |
825 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
826 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
571ecf67 JB |
827 | |
828 | if (!sta) | |
9ae54c84 | 829 | return RX_CONTINUE; |
571ecf67 | 830 | |
b291ba11 JB |
831 | /* |
832 | * Update last_rx only for IBSS packets which are for the current | |
833 | * BSSID to avoid keeping the current IBSS network alive in cases | |
834 | * where other STAs start using different BSSID. | |
835 | */ | |
05c914fe | 836 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 837 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 838 | NL80211_IFTYPE_ADHOC); |
46900298 | 839 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 840 | sta->last_rx = jiffies; |
b291ba11 JB |
841 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
842 | /* | |
33b64eb2 LCC |
843 | * Mesh beacons will update last_rx when if they are found to |
844 | * match the current local configuration when processed. | |
571ecf67 | 845 | */ |
b291ba11 | 846 | sta->last_rx = jiffies; |
571ecf67 JB |
847 | } |
848 | ||
5cf121c3 | 849 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 850 | return RX_CONTINUE; |
571ecf67 | 851 | |
3cf335d5 KV |
852 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
853 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
854 | ||
571ecf67 JB |
855 | sta->rx_fragments++; |
856 | sta->rx_bytes += rx->skb->len; | |
eb9fb5b8 JB |
857 | sta->last_signal = status->signal; |
858 | sta->last_noise = status->noise; | |
571ecf67 | 859 | |
72eaa43a JB |
860 | /* |
861 | * Change STA power saving mode only at the end of a frame | |
862 | * exchange sequence. | |
863 | */ | |
3e122be0 | 864 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
865 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
866 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
af818581 | 867 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
72eaa43a JB |
868 | /* |
869 | * Ignore doze->wake transitions that are | |
870 | * indicated by non-data frames, the standard | |
871 | * is unclear here, but for example going to | |
872 | * PS mode and then scanning would cause a | |
873 | * doze->wake transition for the probe request, | |
874 | * and that is clearly undesirable. | |
875 | */ | |
876 | if (ieee80211_is_data(hdr->frame_control) && | |
877 | !ieee80211_has_pm(hdr->frame_control)) | |
ff9458d3 | 878 | ap_sta_ps_end(sta); |
72eaa43a JB |
879 | } else { |
880 | if (ieee80211_has_pm(hdr->frame_control)) | |
881 | ap_sta_ps_start(sta); | |
882 | } | |
571ecf67 JB |
883 | } |
884 | ||
22403def JB |
885 | /* |
886 | * Drop (qos-)data::nullfunc frames silently, since they | |
887 | * are used only to control station power saving mode. | |
888 | */ | |
889 | if (ieee80211_is_nullfunc(hdr->frame_control) || | |
890 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
571ecf67 | 891 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
22403def JB |
892 | /* |
893 | * Update counter and free packet here to avoid | |
894 | * counting this as a dropped packed. | |
895 | */ | |
571ecf67 JB |
896 | sta->rx_packets++; |
897 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 898 | return RX_QUEUED; |
571ecf67 JB |
899 | } |
900 | ||
9ae54c84 | 901 | return RX_CONTINUE; |
571ecf67 JB |
902 | } /* ieee80211_rx_h_sta_process */ |
903 | ||
571ecf67 JB |
904 | static inline struct ieee80211_fragment_entry * |
905 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
906 | unsigned int frag, unsigned int seq, int rx_queue, | |
907 | struct sk_buff **skb) | |
908 | { | |
909 | struct ieee80211_fragment_entry *entry; | |
910 | int idx; | |
911 | ||
912 | idx = sdata->fragment_next; | |
913 | entry = &sdata->fragments[sdata->fragment_next++]; | |
914 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
915 | sdata->fragment_next = 0; | |
916 | ||
917 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 918 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
919 | struct ieee80211_hdr *hdr = |
920 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
921 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
922 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 923 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
924 | sdata->dev->name, idx, |
925 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 926 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 927 | #endif |
571ecf67 JB |
928 | __skb_queue_purge(&entry->skb_list); |
929 | } | |
930 | ||
931 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
932 | *skb = NULL; | |
933 | entry->first_frag_time = jiffies; | |
934 | entry->seq = seq; | |
935 | entry->rx_queue = rx_queue; | |
936 | entry->last_frag = frag; | |
937 | entry->ccmp = 0; | |
938 | entry->extra_len = 0; | |
939 | ||
940 | return entry; | |
941 | } | |
942 | ||
943 | static inline struct ieee80211_fragment_entry * | |
944 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 945 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
946 | int rx_queue, struct ieee80211_hdr *hdr) |
947 | { | |
948 | struct ieee80211_fragment_entry *entry; | |
949 | int i, idx; | |
950 | ||
951 | idx = sdata->fragment_next; | |
952 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
953 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
954 | |
955 | idx--; | |
956 | if (idx < 0) | |
957 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
958 | ||
959 | entry = &sdata->fragments[idx]; | |
960 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
961 | entry->rx_queue != rx_queue || | |
962 | entry->last_frag + 1 != frag) | |
963 | continue; | |
964 | ||
b73d70ad | 965 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 966 | |
b73d70ad HH |
967 | /* |
968 | * Check ftype and addresses are equal, else check next fragment | |
969 | */ | |
970 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
971 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
972 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
973 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
974 | continue; | |
975 | ||
ab46623e | 976 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
977 | __skb_queue_purge(&entry->skb_list); |
978 | continue; | |
979 | } | |
980 | return entry; | |
981 | } | |
982 | ||
983 | return NULL; | |
984 | } | |
985 | ||
49461622 | 986 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 987 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
988 | { |
989 | struct ieee80211_hdr *hdr; | |
990 | u16 sc; | |
358c8d9d | 991 | __le16 fc; |
571ecf67 JB |
992 | unsigned int frag, seq; |
993 | struct ieee80211_fragment_entry *entry; | |
994 | struct sk_buff *skb; | |
995 | ||
b73d70ad | 996 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 997 | fc = hdr->frame_control; |
571ecf67 JB |
998 | sc = le16_to_cpu(hdr->seq_ctrl); |
999 | frag = sc & IEEE80211_SCTL_FRAG; | |
1000 | ||
358c8d9d | 1001 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1002 | (rx->skb)->len < 24 || |
1003 | is_multicast_ether_addr(hdr->addr1))) { | |
1004 | /* not fragmented */ | |
1005 | goto out; | |
1006 | } | |
1007 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1008 | ||
1009 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1010 | ||
1011 | if (frag == 0) { | |
1012 | /* This is the first fragment of a new frame. */ | |
1013 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1014 | rx->queue, &(rx->skb)); |
8f20fc24 | 1015 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1016 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1017 | /* Store CCMP PN so that we can verify that the next |
1018 | * fragment has a sequential PN value. */ | |
1019 | entry->ccmp = 1; | |
1020 | memcpy(entry->last_pn, | |
5cf121c3 | 1021 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1022 | CCMP_PN_LEN); |
1023 | } | |
9ae54c84 | 1024 | return RX_QUEUED; |
571ecf67 JB |
1025 | } |
1026 | ||
1027 | /* This is a fragment for a frame that should already be pending in | |
1028 | * fragment cache. Add this fragment to the end of the pending entry. | |
1029 | */ | |
b73d70ad | 1030 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1031 | if (!entry) { |
1032 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1033 | return RX_DROP_MONITOR; |
571ecf67 JB |
1034 | } |
1035 | ||
1036 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1037 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1038 | if (entry->ccmp) { | |
1039 | int i; | |
1040 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1041 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1042 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1043 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1044 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1045 | pn[i]++; | |
1046 | if (pn[i]) | |
1047 | break; | |
1048 | } | |
5cf121c3 | 1049 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1050 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1051 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1052 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1053 | } | |
1054 | ||
358c8d9d | 1055 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1056 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1057 | entry->last_frag = frag; | |
1058 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1059 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1060 | rx->skb = NULL; |
9ae54c84 | 1061 | return RX_QUEUED; |
571ecf67 JB |
1062 | } |
1063 | ||
1064 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1065 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1066 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1067 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1068 | GFP_ATOMIC))) { | |
1069 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1070 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1071 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1072 | } |
1073 | } | |
1074 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1075 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1076 | dev_kfree_skb(skb); | |
1077 | } | |
1078 | ||
1079 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1080 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1081 | |
1082 | out: | |
1083 | if (rx->sta) | |
1084 | rx->sta->rx_packets++; | |
1085 | if (is_multicast_ether_addr(hdr->addr1)) | |
1086 | rx->local->dot11MulticastReceivedFrameCount++; | |
1087 | else | |
1088 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1089 | return RX_CONTINUE; |
571ecf67 JB |
1090 | } |
1091 | ||
49461622 | 1092 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1093 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1094 | { |
af818581 | 1095 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
358c8d9d | 1096 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1097 | |
358c8d9d | 1098 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1099 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1100 | return RX_CONTINUE; |
571ecf67 | 1101 | |
05c914fe JB |
1102 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1103 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1104 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1105 | |
af818581 JB |
1106 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
1107 | ieee80211_sta_ps_deliver_poll_response(rx->sta); | |
1108 | else | |
1109 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); | |
571ecf67 | 1110 | |
9ae54c84 | 1111 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1112 | * count as an dropped frame. */ |
1113 | dev_kfree_skb(rx->skb); | |
1114 | ||
9ae54c84 | 1115 | return RX_QUEUED; |
571ecf67 JB |
1116 | } |
1117 | ||
49461622 | 1118 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1119 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1120 | { |
6e0d114d | 1121 | u8 *data = rx->skb->data; |
238f74a2 | 1122 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1123 | |
238f74a2 | 1124 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1125 | return RX_CONTINUE; |
6e0d114d JB |
1126 | |
1127 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1128 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1129 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1130 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1131 | /* change frame type to non QOS */ |
238f74a2 | 1132 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1133 | |
9ae54c84 | 1134 | return RX_CONTINUE; |
6e0d114d JB |
1135 | } |
1136 | ||
76ee65bf | 1137 | static int |
5cf121c3 | 1138 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1139 | { |
07346f81 | 1140 | if (unlikely(!rx->sta || |
f4ea83dd | 1141 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1142 | return -EACCES; |
571ecf67 | 1143 | |
76ee65bf | 1144 | return 0; |
571ecf67 JB |
1145 | } |
1146 | ||
76ee65bf | 1147 | static int |
358c8d9d | 1148 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1149 | { |
eb9fb5b8 JB |
1150 | struct sk_buff *skb = rx->skb; |
1151 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1152 | ||
3017b80b | 1153 | /* |
7848ba7d JB |
1154 | * Pass through unencrypted frames if the hardware has |
1155 | * decrypted them already. | |
3017b80b | 1156 | */ |
eb9fb5b8 | 1157 | if (status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1158 | return 0; |
571ecf67 JB |
1159 | |
1160 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1161 | if (unlikely(!ieee80211_has_protected(fc) && |
1162 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1163 | ieee80211_is_data(fc) && |
b3fc9c6c | 1164 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1165 | return -EACCES; |
f2ca3ea4 JM |
1166 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1167 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1168 | rx->key)) | |
1169 | return -EACCES; | |
1170 | /* BIP does not use Protected field, so need to check MMIE */ | |
f64f9e71 JP |
1171 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
1172 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
f2ca3ea4 JM |
1173 | rx->key)) |
1174 | return -EACCES; | |
1175 | /* | |
1176 | * When using MFP, Action frames are not allowed prior to | |
1177 | * having configured keys. | |
1178 | */ | |
1179 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1180 | ieee80211_is_robust_mgmt_frame( | |
1181 | (struct ieee80211_hdr *) rx->skb->data))) | |
1182 | return -EACCES; | |
1183 | } | |
b3fc9c6c | 1184 | |
76ee65bf | 1185 | return 0; |
571ecf67 JB |
1186 | } |
1187 | ||
76ee65bf | 1188 | static int |
e31a16d6 | 1189 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 | 1190 | { |
eb9fb5b8 JB |
1191 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1192 | struct net_device *dev = sdata->dev; | |
f14543ee FF |
1193 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1194 | ||
9bc383de JB |
1195 | if (ieee80211_has_a4(hdr->frame_control) && |
1196 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) | |
f14543ee | 1197 | return -1; |
9bc383de JB |
1198 | |
1199 | if (is_multicast_ether_addr(hdr->addr1) && | |
1200 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || | |
1201 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) | |
f14543ee | 1202 | return -1; |
571ecf67 | 1203 | |
e31a16d6 | 1204 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
76ee65bf | 1205 | } |
571ecf67 | 1206 | |
ce3edf6d JB |
1207 | /* |
1208 | * requires that rx->skb is a frame with ethernet header | |
1209 | */ | |
358c8d9d | 1210 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1211 | { |
c97c23e3 | 1212 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1213 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1214 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1215 | ||
1216 | /* | |
1217 | * Allow EAPOL frames to us/the PAE group address regardless | |
1218 | * of whether the frame was encrypted or not. | |
1219 | */ | |
1220 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
eb9fb5b8 | 1221 | (compare_ether_addr(ehdr->h_dest, rx->sdata->dev->dev_addr) == 0 || |
ce3edf6d JB |
1222 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
1223 | return true; | |
1224 | ||
1225 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1226 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1227 | return false; |
1228 | ||
1229 | return true; | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * requires that rx->skb is a frame with ethernet header | |
1234 | */ | |
76ee65bf | 1235 | static void |
5cf121c3 | 1236 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf | 1237 | { |
eb9fb5b8 JB |
1238 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1239 | struct net_device *dev = sdata->dev; | |
76ee65bf RR |
1240 | struct ieee80211_local *local = rx->local; |
1241 | struct sk_buff *skb, *xmit_skb; | |
ce3edf6d JB |
1242 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1243 | struct sta_info *dsta; | |
571ecf67 | 1244 | |
76ee65bf RR |
1245 | skb = rx->skb; |
1246 | xmit_skb = NULL; | |
571ecf67 | 1247 | |
05c914fe JB |
1248 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1249 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1250 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
9bc383de JB |
1251 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
1252 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { | |
ce3edf6d JB |
1253 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1254 | /* | |
1255 | * send multicast frames both to higher layers in | |
1256 | * local net stack and back to the wireless medium | |
1257 | */ | |
76ee65bf RR |
1258 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1259 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1260 | printk(KERN_DEBUG "%s: failed to clone " |
1261 | "multicast frame\n", dev->name); | |
1262 | } else { | |
571ecf67 | 1263 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1264 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1265 | /* |
1266 | * The destination station is associated to | |
1267 | * this AP (in this VLAN), so send the frame | |
1268 | * directly to it and do not pass it to local | |
1269 | * net stack. | |
571ecf67 | 1270 | */ |
76ee65bf | 1271 | xmit_skb = skb; |
571ecf67 JB |
1272 | skb = NULL; |
1273 | } | |
571ecf67 JB |
1274 | } |
1275 | } | |
1276 | ||
1277 | if (skb) { | |
d1c3a37c JB |
1278 | int align __maybe_unused; |
1279 | ||
1280 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1281 | /* | |
1282 | * 'align' will only take the values 0 or 2 here | |
1283 | * since all frames are required to be aligned | |
1284 | * to 2-byte boundaries when being passed to | |
1285 | * mac80211. That also explains the __skb_push() | |
1286 | * below. | |
1287 | */ | |
dacb6f1d | 1288 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1289 | if (align) { |
1290 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1291 | dev_kfree_skb(skb); | |
1292 | skb = NULL; | |
1293 | } else { | |
1294 | u8 *data = skb->data; | |
8ce0b589 ZY |
1295 | size_t len = skb_headlen(skb); |
1296 | skb->data -= align; | |
1297 | memmove(skb->data, data, len); | |
1298 | skb_set_tail_pointer(skb, len); | |
d1c3a37c JB |
1299 | } |
1300 | } | |
1301 | #endif | |
1302 | ||
1303 | if (skb) { | |
1304 | /* deliver to local stack */ | |
1305 | skb->protocol = eth_type_trans(skb, dev); | |
1306 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1307 | netif_rx(skb); | |
1308 | } | |
571ecf67 JB |
1309 | } |
1310 | ||
76ee65bf | 1311 | if (xmit_skb) { |
571ecf67 | 1312 | /* send to wireless media */ |
f831e909 | 1313 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1314 | skb_reset_network_header(xmit_skb); |
1315 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1316 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1317 | } |
76ee65bf RR |
1318 | } |
1319 | ||
49461622 | 1320 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1321 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f | 1322 | { |
eb9fb5b8 | 1323 | struct net_device *dev = rx->sdata->dev; |
fd4c7f2f | 1324 | struct ieee80211_local *local = rx->local; |
358c8d9d | 1325 | u16 ethertype; |
fd4c7f2f RR |
1326 | u8 *payload; |
1327 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1328 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1329 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1330 | const struct ethhdr *eth; |
1331 | int remaining, err; | |
1332 | u8 dst[ETH_ALEN]; | |
1333 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1334 | |
358c8d9d | 1335 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1336 | return RX_CONTINUE; |
fd4c7f2f | 1337 | |
358c8d9d | 1338 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1339 | return RX_DROP_MONITOR; |
fd4c7f2f | 1340 | |
5cf121c3 | 1341 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1342 | return RX_CONTINUE; |
fd4c7f2f | 1343 | |
e31a16d6 | 1344 | err = __ieee80211_data_to_8023(rx); |
fd4c7f2f | 1345 | if (unlikely(err)) |
e4c26add | 1346 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1347 | |
1348 | skb->dev = dev; | |
1349 | ||
1350 | dev->stats.rx_packets++; | |
1351 | dev->stats.rx_bytes += skb->len; | |
1352 | ||
1353 | /* skip the wrapping header */ | |
1354 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1355 | if (!eth) | |
e4c26add | 1356 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1357 | |
1358 | while (skb != frame) { | |
1359 | u8 padding; | |
1360 | __be16 len = eth->h_proto; | |
1361 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1362 | ||
1363 | remaining = skb->len; | |
1364 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1365 | memcpy(src, eth->h_source, ETH_ALEN); | |
1366 | ||
1367 | padding = ((4 - subframe_len) & 0x3); | |
1368 | /* the last MSDU has no padding */ | |
f4ea83dd | 1369 | if (subframe_len > remaining) |
e4c26add | 1370 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1371 | |
1372 | skb_pull(skb, sizeof(struct ethhdr)); | |
1373 | /* if last subframe reuse skb */ | |
1374 | if (remaining <= subframe_len + padding) | |
1375 | frame = skb; | |
1376 | else { | |
d1c3a37c JB |
1377 | /* |
1378 | * Allocate and reserve two bytes more for payload | |
1379 | * alignment since sizeof(struct ethhdr) is 14. | |
1380 | */ | |
1381 | frame = dev_alloc_skb( | |
1382 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1383 | subframe_len + 2); | |
fd4c7f2f RR |
1384 | |
1385 | if (frame == NULL) | |
e4c26add | 1386 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1387 | |
d1c3a37c JB |
1388 | skb_reserve(frame, |
1389 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1390 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1391 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1392 | ntohs(len)); | |
1393 | ||
1394 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1395 | padding); | |
1396 | if (!eth) { | |
fd4c7f2f | 1397 | dev_kfree_skb(frame); |
e4c26add | 1398 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1399 | } |
1400 | } | |
1401 | ||
ce3edf6d | 1402 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1403 | frame->dev = dev; |
1404 | frame->priority = skb->priority; | |
1405 | rx->skb = frame; | |
1406 | ||
fd4c7f2f RR |
1407 | payload = frame->data; |
1408 | ethertype = (payload[6] << 8) | payload[7]; | |
1409 | ||
1410 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1411 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1412 | compare_ether_addr(payload, | |
1413 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1414 | /* remove RFC1042 or Bridge-Tunnel |
1415 | * encapsulation and replace EtherType */ | |
1416 | skb_pull(frame, 6); | |
1417 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1418 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1419 | } else { | |
ce3edf6d JB |
1420 | memcpy(skb_push(frame, sizeof(__be16)), |
1421 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1422 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1423 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1424 | } | |
1425 | ||
358c8d9d | 1426 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1427 | if (skb == frame) /* last frame */ |
e4c26add | 1428 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1429 | dev_kfree_skb(frame); |
1430 | continue; | |
1431 | } | |
fd4c7f2f RR |
1432 | |
1433 | ieee80211_deliver_skb(rx); | |
1434 | } | |
1435 | ||
9ae54c84 | 1436 | return RX_QUEUED; |
fd4c7f2f RR |
1437 | } |
1438 | ||
bf94e17b | 1439 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1440 | static ieee80211_rx_result |
e32f85f7 LCC |
1441 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1442 | { | |
1443 | struct ieee80211_hdr *hdr; | |
1444 | struct ieee80211s_hdr *mesh_hdr; | |
1445 | unsigned int hdrlen; | |
1446 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1447 | struct ieee80211_local *local = rx->local; |
eb9fb5b8 | 1448 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
e32f85f7 LCC |
1449 | |
1450 | hdr = (struct ieee80211_hdr *) skb->data; | |
1451 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1452 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1453 | ||
1454 | if (!ieee80211_is_data(hdr->frame_control)) | |
1455 | return RX_CONTINUE; | |
1456 | ||
1457 | if (!mesh_hdr->ttl) | |
1458 | /* illegal frame */ | |
1459 | return RX_DROP_MONITOR; | |
1460 | ||
43b7b314 | 1461 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1462 | struct mesh_path *mppath; |
43b7b314 JC |
1463 | char *proxied_addr; |
1464 | char *mpp_addr; | |
1465 | ||
1466 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1467 | mpp_addr = hdr->addr3; | |
1468 | proxied_addr = mesh_hdr->eaddr1; | |
1469 | } else { | |
1470 | mpp_addr = hdr->addr4; | |
1471 | proxied_addr = mesh_hdr->eaddr2; | |
1472 | } | |
79617dee | 1473 | |
79617dee | 1474 | rcu_read_lock(); |
43b7b314 | 1475 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1476 | if (!mppath) { |
43b7b314 | 1477 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1478 | } else { |
1479 | spin_lock_bh(&mppath->state_lock); | |
1480 | mppath->exp_time = jiffies; | |
43b7b314 JC |
1481 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1482 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1483 | spin_unlock_bh(&mppath->state_lock); |
1484 | } | |
1485 | rcu_read_unlock(); | |
1486 | } | |
1487 | ||
3c5772a5 JC |
1488 | /* Frame has reached destination. Don't forward */ |
1489 | if (!is_multicast_ether_addr(hdr->addr1) && | |
eb9fb5b8 | 1490 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr3) == 0) |
e32f85f7 LCC |
1491 | return RX_CONTINUE; |
1492 | ||
1493 | mesh_hdr->ttl--; | |
1494 | ||
1495 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1496 | if (!mesh_hdr->ttl) | |
472dbc45 | 1497 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1498 | dropped_frames_ttl); |
1499 | else { | |
1500 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1501 | struct ieee80211_tx_info *info; |
1502 | ||
e32f85f7 LCC |
1503 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1504 | ||
1505 | if (!fwd_skb && net_ratelimit()) | |
1506 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
eb9fb5b8 | 1507 | sdata->dev->name); |
e32f85f7 LCC |
1508 | |
1509 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
eb9fb5b8 | 1510 | memcpy(fwd_hdr->addr2, sdata->dev->dev_addr, ETH_ALEN); |
3b8d81e0 JB |
1511 | info = IEEE80211_SKB_CB(fwd_skb); |
1512 | memset(info, 0, sizeof(*info)); | |
1513 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1514 | info->control.vif = &rx->sdata->vif; |
3b8d81e0 | 1515 | ieee80211_select_queue(local, fwd_skb); |
c8a61a7d DW |
1516 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1517 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1518 | fwded_mcast); | |
1519 | else { | |
3c5772a5 JC |
1520 | int err; |
1521 | /* | |
1522 | * Save TA to addr1 to send TA a path error if a | |
1523 | * suitable next hop is not found | |
1524 | */ | |
1525 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1526 | ETH_ALEN); |
3c5772a5 | 1527 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1528 | /* Failed to immediately resolve next hop: |
1529 | * fwded frame was dropped or will be added | |
1530 | * later to the pending skb queue. */ | |
1531 | if (err) | |
1532 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1533 | |
1534 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1535 | fwded_unicast); | |
249b405c JC |
1536 | } |
1537 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1538 | fwded_frames); | |
3b8d81e0 | 1539 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1540 | } |
1541 | } | |
1542 | ||
3c5772a5 | 1543 | if (is_multicast_ether_addr(hdr->addr1) || |
eb9fb5b8 | 1544 | sdata->dev->flags & IFF_PROMISC) |
e32f85f7 LCC |
1545 | return RX_CONTINUE; |
1546 | else | |
1547 | return RX_DROP_MONITOR; | |
1548 | } | |
bf94e17b | 1549 | #endif |
e32f85f7 | 1550 | |
49461622 | 1551 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1552 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf | 1553 | { |
eb9fb5b8 JB |
1554 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
1555 | struct net_device *dev = sdata->dev; | |
358c8d9d HH |
1556 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1557 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1558 | int err; |
76ee65bf | 1559 | |
358c8d9d | 1560 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1561 | return RX_CONTINUE; |
76ee65bf | 1562 | |
358c8d9d | 1563 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1564 | return RX_DROP_MONITOR; |
76ee65bf | 1565 | |
f14543ee FF |
1566 | /* |
1567 | * Allow the cooked monitor interface of an AP to see 4-addr frames so | |
1568 | * that a 4-addr station can be detected and moved into a separate VLAN | |
1569 | */ | |
1570 | if (ieee80211_has_a4(hdr->frame_control) && | |
1571 | sdata->vif.type == NL80211_IFTYPE_AP) | |
1572 | return RX_DROP_MONITOR; | |
1573 | ||
e31a16d6 | 1574 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1575 | if (unlikely(err)) |
e4c26add | 1576 | return RX_DROP_UNUSABLE; |
76ee65bf | 1577 | |
358c8d9d | 1578 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1579 | return RX_DROP_MONITOR; |
ce3edf6d | 1580 | |
76ee65bf RR |
1581 | rx->skb->dev = dev; |
1582 | ||
1583 | dev->stats.rx_packets++; | |
1584 | dev->stats.rx_bytes += rx->skb->len; | |
1585 | ||
1586 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1587 | |
9ae54c84 | 1588 | return RX_QUEUED; |
571ecf67 JB |
1589 | } |
1590 | ||
49461622 | 1591 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1592 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1593 | { |
1594 | struct ieee80211_local *local = rx->local; | |
1595 | struct ieee80211_hw *hw = &local->hw; | |
1596 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1597 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1598 | struct tid_ampdu_rx *tid_agg_rx; |
1599 | u16 start_seq_num; | |
1600 | u16 tid; | |
1601 | ||
a7767f95 | 1602 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1603 | return RX_CONTINUE; |
71364716 | 1604 | |
a7767f95 | 1605 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1606 | if (!rx->sta) |
a02ae758 | 1607 | return RX_DROP_MONITOR; |
71364716 | 1608 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1609 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1610 | != HT_AGG_STATE_OPERATIONAL) | |
a02ae758 | 1611 | return RX_DROP_MONITOR; |
cee24a3e | 1612 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1613 | |
1614 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1615 | ||
1616 | /* reset session timer */ | |
20ad19d0 JB |
1617 | if (tid_agg_rx->timeout) |
1618 | mod_timer(&tid_agg_rx->session_timer, | |
1619 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 | 1620 | |
a02ae758 JB |
1621 | /* release stored frames up to start of BAR */ |
1622 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); | |
1623 | kfree_skb(skb); | |
1624 | return RX_QUEUED; | |
71364716 RR |
1625 | } |
1626 | ||
9ae54c84 | 1627 | return RX_CONTINUE; |
71364716 RR |
1628 | } |
1629 | ||
f4f727a6 JM |
1630 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1631 | struct ieee80211_mgmt *mgmt, | |
1632 | size_t len) | |
fea14732 JM |
1633 | { |
1634 | struct ieee80211_local *local = sdata->local; | |
1635 | struct sk_buff *skb; | |
1636 | struct ieee80211_mgmt *resp; | |
1637 | ||
1638 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1639 | /* Not to own unicast address */ | |
1640 | return; | |
1641 | } | |
1642 | ||
46900298 JB |
1643 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1644 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1645 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1646 | return; |
1647 | } | |
1648 | ||
1649 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1650 | /* Too short SA Query request frame */ | |
1651 | return; | |
1652 | } | |
1653 | ||
1654 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1655 | if (skb == NULL) | |
1656 | return; | |
1657 | ||
1658 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1659 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1660 | memset(resp, 0, 24); | |
1661 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1662 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1663 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1664 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1665 | IEEE80211_STYPE_ACTION); | |
1666 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1667 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1668 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1669 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1670 | mgmt->u.action.u.sa_query.trans_id, | |
1671 | WLAN_SA_QUERY_TR_ID_LEN); | |
1672 | ||
62ae67be | 1673 | ieee80211_tx_skb(sdata, skb); |
fea14732 JM |
1674 | } |
1675 | ||
de1ede7a JB |
1676 | static ieee80211_rx_result debug_noinline |
1677 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1678 | { | |
1679 | struct ieee80211_local *local = rx->local; | |
eb9fb5b8 | 1680 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
de1ede7a JB |
1681 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
1682 | int len = rx->skb->len; | |
1683 | ||
1684 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1685 | return RX_CONTINUE; | |
1686 | ||
1687 | if (!rx->sta) | |
1688 | return RX_DROP_MONITOR; | |
1689 | ||
1690 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1691 | return RX_DROP_MONITOR; | |
1692 | ||
97ebe12a JM |
1693 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1694 | return RX_DROP_MONITOR; | |
1695 | ||
de1ede7a JB |
1696 | /* all categories we currently handle have action_code */ |
1697 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1698 | return RX_DROP_MONITOR; | |
1699 | ||
de1ede7a JB |
1700 | switch (mgmt->u.action.category) { |
1701 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1702 | /* |
1703 | * The aggregation code is not prepared to handle | |
1704 | * anything but STA/AP due to the BSSID handling; | |
1705 | * IBSS could work in the code but isn't supported | |
1706 | * by drivers or the standard. | |
1707 | */ | |
1708 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1709 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1710 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1711 | return RX_DROP_MONITOR; | |
1712 | ||
de1ede7a JB |
1713 | switch (mgmt->u.action.u.addba_req.action_code) { |
1714 | case WLAN_ACTION_ADDBA_REQ: | |
1715 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1716 | sizeof(mgmt->u.action.u.addba_req))) | |
1717 | return RX_DROP_MONITOR; | |
1718 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1719 | break; | |
1720 | case WLAN_ACTION_ADDBA_RESP: | |
1721 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1722 | sizeof(mgmt->u.action.u.addba_resp))) | |
1723 | return RX_DROP_MONITOR; | |
1724 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1725 | break; | |
1726 | case WLAN_ACTION_DELBA: | |
1727 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1728 | sizeof(mgmt->u.action.u.delba))) | |
1729 | return RX_DROP_MONITOR; | |
1730 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1731 | break; | |
1732 | } | |
39192c0b JB |
1733 | break; |
1734 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1735 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1736 | return RX_DROP_MONITOR; | |
46900298 JB |
1737 | |
1738 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1739 | return RX_DROP_MONITOR; | |
1740 | ||
39192c0b JB |
1741 | switch (mgmt->u.action.u.measurement.action_code) { |
1742 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1743 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1744 | sizeof(mgmt->u.action.u.measurement))) | |
1745 | return RX_DROP_MONITOR; | |
1746 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1747 | break; | |
c481ec97 S |
1748 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1749 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1750 | sizeof(mgmt->u.action.u.chan_switch))) | |
1751 | return RX_DROP_MONITOR; | |
1752 | ||
cc32abd4 JB |
1753 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1754 | return RX_DROP_MONITOR; | |
1755 | ||
46900298 | 1756 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1757 | return RX_DROP_MONITOR; |
1758 | ||
77fdaa12 | 1759 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1760 | } |
1761 | break; | |
fea14732 JM |
1762 | case WLAN_CATEGORY_SA_QUERY: |
1763 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1764 | sizeof(mgmt->u.action.u.sa_query))) | |
1765 | return RX_DROP_MONITOR; | |
1766 | switch (mgmt->u.action.u.sa_query.action) { | |
1767 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1768 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1769 | return RX_DROP_MONITOR; | |
1770 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1771 | break; | |
1772 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1773 | /* | |
1774 | * SA Query response is currently only used in AP mode | |
1775 | * and it is processed in user space. | |
1776 | */ | |
1777 | return RX_CONTINUE; | |
1778 | } | |
1779 | break; | |
39192c0b JB |
1780 | default: |
1781 | return RX_CONTINUE; | |
de1ede7a JB |
1782 | } |
1783 | ||
39192c0b JB |
1784 | rx->sta->rx_packets++; |
1785 | dev_kfree_skb(rx->skb); | |
1786 | return RX_QUEUED; | |
de1ede7a JB |
1787 | } |
1788 | ||
49461622 | 1789 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1790 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1791 | { |
eb9fb5b8 | 1792 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
97ebe12a | 1793 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1794 | |
5cf121c3 | 1795 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1796 | return RX_DROP_MONITOR; |
571ecf67 | 1797 | |
97ebe12a JM |
1798 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1799 | return RX_DROP_MONITOR; | |
1800 | ||
472dbc45 | 1801 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 1802 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 1803 | |
3832c287 | 1804 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 1805 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 1806 | |
7986cf95 | 1807 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 1808 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 1809 | |
7986cf95 | 1810 | return RX_DROP_MONITOR; |
571ecf67 JB |
1811 | } |
1812 | ||
3b8d81e0 | 1813 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 1814 | struct ieee80211_rx_data *rx) |
571ecf67 | 1815 | { |
a7767f95 HH |
1816 | int keyidx; |
1817 | unsigned int hdrlen; | |
571ecf67 | 1818 | |
a7767f95 | 1819 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1820 | if (rx->skb->len >= hdrlen + 4) |
1821 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1822 | else | |
1823 | keyidx = -1; | |
1824 | ||
8944b79f | 1825 | if (!rx->sta) { |
aa0daf0e JB |
1826 | /* |
1827 | * Some hardware seem to generate incorrect Michael MIC | |
1828 | * reports; ignore them to avoid triggering countermeasures. | |
1829 | */ | |
af2ced6a | 1830 | return; |
571ecf67 JB |
1831 | } |
1832 | ||
a7767f95 | 1833 | if (!ieee80211_has_protected(hdr->frame_control)) |
af2ced6a | 1834 | return; |
571ecf67 | 1835 | |
05c914fe | 1836 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1837 | /* |
1838 | * APs with pairwise keys should never receive Michael MIC | |
1839 | * errors for non-zero keyidx because these are reserved for | |
1840 | * group keys and only the AP is sending real multicast | |
1841 | * frames in the BSS. | |
1842 | */ | |
af2ced6a | 1843 | return; |
571ecf67 JB |
1844 | } |
1845 | ||
a7767f95 HH |
1846 | if (!ieee80211_is_data(hdr->frame_control) && |
1847 | !ieee80211_is_auth(hdr->frame_control)) | |
af2ced6a | 1848 | return; |
571ecf67 | 1849 | |
e6d6e342 JB |
1850 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
1851 | GFP_ATOMIC); | |
571ecf67 JB |
1852 | } |
1853 | ||
5cf121c3 | 1854 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
5f0b7de5 JB |
1855 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
1856 | struct ieee80211_rate *rate) | |
3d30d949 MW |
1857 | { |
1858 | struct ieee80211_sub_if_data *sdata; | |
1859 | struct ieee80211_local *local = rx->local; | |
1860 | struct ieee80211_rtap_hdr { | |
1861 | struct ieee80211_radiotap_header hdr; | |
1862 | u8 flags; | |
5f0b7de5 | 1863 | u8 rate_or_pad; |
3d30d949 MW |
1864 | __le16 chan_freq; |
1865 | __le16 chan_flags; | |
1866 | } __attribute__ ((packed)) *rthdr; | |
1867 | struct sk_buff *skb = rx->skb, *skb2; | |
1868 | struct net_device *prev_dev = NULL; | |
eb9fb5b8 | 1869 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
3d30d949 | 1870 | |
5cf121c3 | 1871 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1872 | goto out_free_skb; |
1873 | ||
1874 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1875 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1876 | goto out_free_skb; | |
1877 | ||
1878 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1879 | memset(rthdr, 0, sizeof(*rthdr)); | |
1880 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1881 | rthdr->hdr.it_present = | |
1882 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
3d30d949 MW |
1883 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
1884 | ||
5f0b7de5 JB |
1885 | if (rate) { |
1886 | rthdr->rate_or_pad = rate->bitrate / 5; | |
1887 | rthdr->hdr.it_present |= | |
1888 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); | |
1889 | } | |
3d30d949 MW |
1890 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1891 | ||
1892 | if (status->band == IEEE80211_BAND_5GHZ) | |
1893 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1894 | IEEE80211_CHAN_5GHZ); | |
1895 | else | |
1896 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1897 | IEEE80211_CHAN_2GHZ); | |
1898 | ||
1899 | skb_set_mac_header(skb, 0); | |
1900 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1901 | skb->pkt_type = PACKET_OTHERHOST; | |
1902 | skb->protocol = htons(ETH_P_802_2); | |
1903 | ||
1904 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1905 | if (!netif_running(sdata->dev)) | |
1906 | continue; | |
1907 | ||
05c914fe | 1908 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1909 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1910 | continue; | |
1911 | ||
1912 | if (prev_dev) { | |
1913 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1914 | if (skb2) { | |
1915 | skb2->dev = prev_dev; | |
1916 | netif_rx(skb2); | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | prev_dev = sdata->dev; | |
1921 | sdata->dev->stats.rx_packets++; | |
1922 | sdata->dev->stats.rx_bytes += skb->len; | |
1923 | } | |
1924 | ||
1925 | if (prev_dev) { | |
1926 | skb->dev = prev_dev; | |
1927 | netif_rx(skb); | |
1928 | skb = NULL; | |
1929 | } else | |
1930 | goto out_free_skb; | |
1931 | ||
5cf121c3 | 1932 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1933 | return; |
1934 | ||
1935 | out_free_skb: | |
1936 | dev_kfree_skb(skb); | |
1937 | } | |
1938 | ||
571ecf67 | 1939 | |
8944b79f | 1940 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1941 | struct ieee80211_rx_data *rx, |
5f0b7de5 JB |
1942 | struct sk_buff *skb, |
1943 | struct ieee80211_rate *rate) | |
58905290 | 1944 | { |
58905290 JB |
1945 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1946 | ||
8944b79f JB |
1947 | rx->skb = skb; |
1948 | rx->sdata = sdata; | |
8944b79f | 1949 | |
e32f85f7 LCC |
1950 | #define CALL_RXH(rxh) \ |
1951 | do { \ | |
1952 | res = rxh(rx); \ | |
1953 | if (res != RX_CONTINUE) \ | |
1954 | goto rxh_done; \ | |
1955 | } while (0); | |
49461622 JB |
1956 | |
1957 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1958 | CALL_RXH(ieee80211_rx_h_check) | |
1959 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 1960 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
1961 | CALL_RXH(ieee80211_rx_h_sta_process) |
1962 | CALL_RXH(ieee80211_rx_h_defragment) | |
1963 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1964 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1965 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1966 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1967 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1968 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1969 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1970 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1971 | #endif |
49461622 JB |
1972 | CALL_RXH(ieee80211_rx_h_data) |
1973 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1974 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1975 | CALL_RXH(ieee80211_rx_h_mgmt) |
1976 | ||
1977 | #undef CALL_RXH | |
1978 | ||
1979 | rxh_done: | |
58905290 JB |
1980 | switch (res) { |
1981 | case RX_DROP_MONITOR: | |
49461622 JB |
1982 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1983 | if (rx->sta) | |
1984 | rx->sta->rx_dropped++; | |
1985 | /* fall through */ | |
1986 | case RX_CONTINUE: | |
5f0b7de5 | 1987 | ieee80211_rx_cooked_monitor(rx, rate); |
3d30d949 | 1988 | break; |
58905290 | 1989 | case RX_DROP_UNUSABLE: |
49461622 JB |
1990 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1991 | if (rx->sta) | |
1992 | rx->sta->rx_dropped++; | |
58905290 JB |
1993 | dev_kfree_skb(rx->skb); |
1994 | break; | |
49461622 JB |
1995 | case RX_QUEUED: |
1996 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1997 | break; | |
58905290 JB |
1998 | } |
1999 | } | |
2000 | ||
571ecf67 JB |
2001 | /* main receive path */ |
2002 | ||
23a24def | 2003 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2004 | struct ieee80211_rx_data *rx, |
23a24def JB |
2005 | struct ieee80211_hdr *hdr) |
2006 | { | |
eb9fb5b8 JB |
2007 | struct sk_buff *skb = rx->skb; |
2008 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
2009 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); | |
23a24def JB |
2010 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2011 | ||
51fb61e7 | 2012 | switch (sdata->vif.type) { |
05c914fe | 2013 | case NL80211_IFTYPE_STATION: |
9bc383de | 2014 | if (!bssid && !sdata->u.mgd.use_4addr) |
23a24def | 2015 | return 0; |
77fdaa12 JB |
2016 | if (!multicast && |
2017 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { | |
4150c572 | 2018 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2019 | return 0; |
5cf121c3 | 2020 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2021 | } |
2022 | break; | |
05c914fe | 2023 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2024 | if (!bssid) |
2025 | return 0; | |
a7767f95 | 2026 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2027 | return 1; |
87291c02 | 2028 | } |
46900298 | 2029 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2030 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2031 | return 0; |
5cf121c3 | 2032 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2033 | } else if (!multicast && |
2034 | compare_ether_addr(sdata->dev->dev_addr, | |
2035 | hdr->addr1) != 0) { | |
4150c572 | 2036 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2037 | return 0; |
5cf121c3 | 2038 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2039 | } else if (!rx->sta) { |
2040 | int rate_idx; | |
eb9fb5b8 | 2041 | if (status->flag & RX_FLAG_HT) |
0fb8ca45 JM |
2042 | rate_idx = 0; /* TODO: HT rates */ |
2043 | else | |
eb9fb5b8 | 2044 | rate_idx = status->rate_idx; |
ab1f5c0b | 2045 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2046 | BIT(rate_idx)); |
2047 | } | |
23a24def | 2048 | break; |
05c914fe | 2049 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2050 | if (!multicast && |
2051 | compare_ether_addr(sdata->dev->dev_addr, | |
2052 | hdr->addr1) != 0) { | |
2053 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2054 | return 0; | |
2055 | ||
5cf121c3 | 2056 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2057 | } |
2058 | break; | |
05c914fe JB |
2059 | case NL80211_IFTYPE_AP_VLAN: |
2060 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2061 | if (!bssid) { |
2062 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2063 | hdr->addr1)) | |
2064 | return 0; | |
2065 | } else if (!ieee80211_bssid_match(bssid, | |
2066 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2067 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2068 | return 0; |
5cf121c3 | 2069 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2070 | } |
23a24def | 2071 | break; |
05c914fe | 2072 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2073 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2074 | return 0; |
2075 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2076 | return 0; | |
2077 | break; | |
05c914fe | 2078 | case NL80211_IFTYPE_MONITOR: |
05c914fe JB |
2079 | case NL80211_IFTYPE_UNSPECIFIED: |
2080 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2081 | /* should never get here */ |
2082 | WARN_ON(1); | |
2083 | break; | |
23a24def JB |
2084 | } |
2085 | ||
2086 | return 1; | |
2087 | } | |
2088 | ||
571ecf67 | 2089 | /* |
6368e4b1 RR |
2090 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2091 | * be called with rcu_read_lock protection. | |
571ecf67 | 2092 | */ |
71ebb4aa RR |
2093 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2094 | struct sk_buff *skb, | |
8318d78a | 2095 | struct ieee80211_rate *rate) |
571ecf67 | 2096 | { |
f1d58c25 | 2097 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2098 | struct ieee80211_local *local = hw_to_local(hw); |
2099 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2100 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2101 | struct ieee80211_rx_data rx; |
6368e4b1 | 2102 | int prepares; |
8e6f0032 JB |
2103 | struct ieee80211_sub_if_data *prev = NULL; |
2104 | struct sk_buff *skb_new; | |
571ecf67 | 2105 | |
358c8d9d | 2106 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2107 | memset(&rx, 0, sizeof(rx)); |
2108 | rx.skb = skb; | |
2109 | rx.local = local; | |
72abd81b | 2110 | |
358c8d9d | 2111 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2112 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2113 | |
142b9f50 HS |
2114 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2115 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2116 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2117 | |
38f3714d | 2118 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2119 | ieee80211_verify_alignment(&rx); |
38f3714d | 2120 | |
af2ced6a | 2121 | rx.sta = sta_info_get(local, hdr->addr2); |
eb9fb5b8 | 2122 | if (rx.sta) |
af2ced6a | 2123 | rx.sdata = rx.sta->sdata; |
571ecf67 | 2124 | |
fbc44bf7 JB |
2125 | if (rx.sdata && ieee80211_is_data(hdr->frame_control)) { |
2126 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2127 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
af2ced6a JB |
2128 | if (prepares) { |
2129 | if (status->flag & RX_FLAG_MMIC_ERROR) { | |
2130 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2131 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2132 | } else | |
2133 | prev = rx.sdata; | |
2134 | } | |
fbc44bf7 | 2135 | } else list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2136 | if (!netif_running(sdata->dev)) |
2137 | continue; | |
2138 | ||
fbc44bf7 JB |
2139 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2140 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b2e7771e JB |
2141 | continue; |
2142 | ||
5cf121c3 | 2143 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2144 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2145 | |
6368e4b1 | 2146 | if (!prepares) |
23a24def | 2147 | continue; |
8e6f0032 | 2148 | |
af2ced6a JB |
2149 | if (status->flag & RX_FLAG_MMIC_ERROR) { |
2150 | rx.sdata = sdata; | |
2151 | if (rx.flags & IEEE80211_RX_RA_MATCH) | |
2152 | ieee80211_rx_michael_mic_report(hdr, &rx); | |
2153 | continue; | |
2154 | } | |
2155 | ||
340e11f3 JB |
2156 | /* |
2157 | * frame is destined for this interface, but if it's not | |
2158 | * also for the previous one we handle that after the | |
2159 | * loop to avoid copying the SKB once too much | |
2160 | */ | |
2161 | ||
2162 | if (!prev) { | |
2163 | prev = sdata; | |
2164 | continue; | |
8e6f0032 | 2165 | } |
340e11f3 JB |
2166 | |
2167 | /* | |
2168 | * frame was destined for the previous interface | |
2169 | * so invoke RX handlers for it | |
2170 | */ | |
2171 | ||
2172 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2173 | if (!skb_new) { | |
2174 | if (net_ratelimit()) | |
2175 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2176 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2177 | wiphy_name(local->hw.wiphy), |
2178 | prev->dev->name); | |
340e11f3 JB |
2179 | continue; |
2180 | } | |
5f0b7de5 | 2181 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate); |
8e6f0032 | 2182 | prev = sdata; |
571ecf67 | 2183 | } |
a4b7d7bd | 2184 | if (prev) |
5f0b7de5 | 2185 | ieee80211_invoke_rx_handlers(prev, &rx, skb, rate); |
a4b7d7bd | 2186 | else |
8e6f0032 | 2187 | dev_kfree_skb(skb); |
571ecf67 | 2188 | } |
6368e4b1 | 2189 | |
b580781e RR |
2190 | #define SEQ_MODULO 0x1000 |
2191 | #define SEQ_MASK 0xfff | |
2192 | ||
2193 | static inline int seq_less(u16 sq1, u16 sq2) | |
2194 | { | |
c6a1fa12 | 2195 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2196 | } |
2197 | ||
2198 | static inline u16 seq_inc(u16 sq) | |
2199 | { | |
c6a1fa12 | 2200 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2201 | } |
2202 | ||
2203 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2204 | { | |
c6a1fa12 | 2205 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2206 | } |
2207 | ||
2208 | ||
2d3babd1 JM |
2209 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
2210 | struct tid_ampdu_rx *tid_agg_rx, | |
2211 | int index) | |
2212 | { | |
2213 | struct ieee80211_supported_band *sband; | |
5f0b7de5 | 2214 | struct ieee80211_rate *rate = NULL; |
f1d58c25 JB |
2215 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
2216 | struct ieee80211_rx_status *status; | |
2d3babd1 | 2217 | |
f1d58c25 | 2218 | if (!skb) |
2d3babd1 JM |
2219 | goto no_frame; |
2220 | ||
f1d58c25 JB |
2221 | status = IEEE80211_SKB_RXCB(skb); |
2222 | ||
2d3babd1 | 2223 | /* release the reordered frames to stack */ |
f1d58c25 | 2224 | sband = hw->wiphy->bands[status->band]; |
5f0b7de5 | 2225 | if (!(status->flag & RX_FLAG_HT)) |
f1d58c25 JB |
2226 | rate = &sband->bitrates[status->rate_idx]; |
2227 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
2d3babd1 JM |
2228 | tid_agg_rx->stored_mpdu_num--; |
2229 | tid_agg_rx->reorder_buf[index] = NULL; | |
2230 | ||
2231 | no_frame: | |
2232 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2233 | } | |
2234 | ||
a02ae758 JB |
2235 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, |
2236 | struct tid_ampdu_rx *tid_agg_rx, | |
2237 | u16 head_seq_num) | |
2238 | { | |
2239 | int index; | |
2240 | ||
2241 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2242 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % | |
2243 | tid_agg_rx->buf_size; | |
2244 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); | |
2245 | } | |
2246 | } | |
2d3babd1 | 2247 | |
4d050f1d JM |
2248 | /* |
2249 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
2250 | * the skb was added to the buffer longer than this time ago, the earlier | |
2251 | * frames that have not yet been received are assumed to be lost and the skb | |
2252 | * can be released for processing. This may also release other skb's from the | |
2253 | * reorder buffer if there are no additional gaps between the frames. | |
2254 | */ | |
2255 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
2256 | ||
71364716 | 2257 | /* |
a02ae758 JB |
2258 | * As this function belongs to the RX path it must be under |
2259 | * rcu_read_lock protection. It returns false if the frame | |
2260 | * can be processed immediately, true if it was consumed. | |
71364716 | 2261 | */ |
a02ae758 JB |
2262 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2263 | struct tid_ampdu_rx *tid_agg_rx, | |
2264 | struct sk_buff *skb) | |
b580781e | 2265 | { |
a02ae758 JB |
2266 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
2267 | u16 sc = le16_to_cpu(hdr->seq_ctrl); | |
2268 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
b580781e RR |
2269 | u16 head_seq_num, buf_size; |
2270 | int index; | |
b580781e RR |
2271 | |
2272 | buf_size = tid_agg_rx->buf_size; | |
2273 | head_seq_num = tid_agg_rx->head_seq_num; | |
2274 | ||
2275 | /* frame with out of date sequence number */ | |
2276 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2277 | dev_kfree_skb(skb); | |
a02ae758 | 2278 | return true; |
b580781e RR |
2279 | } |
2280 | ||
a02ae758 JB |
2281 | /* |
2282 | * If frame the sequence number exceeds our buffering window | |
2283 | * size release some previous frames to make room for this one. | |
2284 | */ | |
2285 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { | |
2286 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
b580781e | 2287 | /* release stored frames up to new head to stack */ |
a02ae758 | 2288 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); |
b580781e RR |
2289 | } |
2290 | ||
a02ae758 JB |
2291 | /* Now the new frame is always in the range of the reordering buffer */ |
2292 | ||
2293 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2294 | ||
b580781e RR |
2295 | /* check if we already stored this frame */ |
2296 | if (tid_agg_rx->reorder_buf[index]) { | |
2297 | dev_kfree_skb(skb); | |
a02ae758 | 2298 | return true; |
b580781e RR |
2299 | } |
2300 | ||
a02ae758 JB |
2301 | /* |
2302 | * If the current MPDU is in the right order and nothing else | |
2303 | * is stored we can process it directly, no need to buffer it. | |
2304 | */ | |
b580781e | 2305 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && |
a02ae758 JB |
2306 | tid_agg_rx->stored_mpdu_num == 0) { |
2307 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2308 | return false; | |
b580781e RR |
2309 | } |
2310 | ||
2311 | /* put the frame in the reordering buffer */ | |
2312 | tid_agg_rx->reorder_buf[index] = skb; | |
4d050f1d | 2313 | tid_agg_rx->reorder_time[index] = jiffies; |
b580781e RR |
2314 | tid_agg_rx->stored_mpdu_num++; |
2315 | /* release the buffer until next missing frame */ | |
a02ae758 JB |
2316 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
2317 | tid_agg_rx->buf_size; | |
4d050f1d JM |
2318 | if (!tid_agg_rx->reorder_buf[index] && |
2319 | tid_agg_rx->stored_mpdu_num > 1) { | |
2320 | /* | |
2321 | * No buffers ready to be released, but check whether any | |
2322 | * frames in the reorder buffer have timed out. | |
2323 | */ | |
2324 | int j; | |
2325 | int skipped = 1; | |
2326 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
2327 | j = (j + 1) % tid_agg_rx->buf_size) { | |
a02ae758 | 2328 | if (!tid_agg_rx->reorder_buf[j]) { |
4d050f1d JM |
2329 | skipped++; |
2330 | continue; | |
2331 | } | |
2332 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
a02ae758 | 2333 | HT_RX_REORDER_BUF_TIMEOUT)) |
4d050f1d JM |
2334 | break; |
2335 | ||
2336 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
2337 | if (net_ratelimit()) | |
2338 | printk(KERN_DEBUG "%s: release an RX reorder " | |
2339 | "frame due to timeout on earlier " | |
2340 | "frames\n", | |
2341 | wiphy_name(hw->wiphy)); | |
2342 | #endif | |
2343 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); | |
2344 | ||
2345 | /* | |
2346 | * Increment the head seq# also for the skipped slots. | |
2347 | */ | |
2348 | tid_agg_rx->head_seq_num = | |
a02ae758 | 2349 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; |
4d050f1d JM |
2350 | skipped = 0; |
2351 | } | |
2352 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2d3babd1 | 2353 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
a02ae758 JB |
2354 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
2355 | tid_agg_rx->buf_size; | |
b580781e | 2356 | } |
a02ae758 JB |
2357 | |
2358 | return true; | |
b580781e RR |
2359 | } |
2360 | ||
a02ae758 JB |
2361 | /* |
2362 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns | |
2363 | * true if the MPDU was buffered, false if it should be processed. | |
2364 | */ | |
2365 | static bool ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, | |
2366 | struct sk_buff *skb) | |
b580781e RR |
2367 | { |
2368 | struct ieee80211_hw *hw = &local->hw; | |
2369 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2370 | struct sta_info *sta; | |
2371 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2372 | u16 sc; |
b580781e RR |
2373 | int tid; |
2374 | ||
a02ae758 JB |
2375 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
2376 | return false; | |
2377 | ||
2378 | /* | |
2379 | * filter the QoS data rx stream according to | |
2380 | * STA/TID and check if this STA/TID is on aggregation | |
2381 | */ | |
2382 | ||
b580781e RR |
2383 | sta = sta_info_get(local, hdr->addr2); |
2384 | if (!sta) | |
a02ae758 | 2385 | return false; |
b580781e | 2386 | |
238f74a2 | 2387 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2388 | |
cee24a3e | 2389 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
a02ae758 | 2390 | return false; |
b580781e | 2391 | |
cee24a3e RR |
2392 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2393 | ||
2560b6e2 EG |
2394 | /* qos null data frames are excluded */ |
2395 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
a02ae758 | 2396 | return false; |
b580781e | 2397 | |
a02ae758 | 2398 | /* new, potentially un-ordered, ampdu frame - process it */ |
b580781e RR |
2399 | |
2400 | /* reset session timer */ | |
20ad19d0 JB |
2401 | if (tid_agg_rx->timeout) |
2402 | mod_timer(&tid_agg_rx->session_timer, | |
2403 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2404 | |
2405 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2406 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2407 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2408 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e | 2409 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
a02ae758 JB |
2410 | dev_kfree_skb(skb); |
2411 | return true; | |
b580781e RR |
2412 | } |
2413 | ||
a02ae758 | 2414 | return ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb); |
b580781e RR |
2415 | } |
2416 | ||
6368e4b1 RR |
2417 | /* |
2418 | * This is the receive path handler. It is called by a low level driver when an | |
2419 | * 802.11 MPDU is received from the hardware. | |
2420 | */ | |
103bf9f7 | 2421 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2422 | { |
2423 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2424 | struct ieee80211_rate *rate = NULL; |
2425 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2426 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2427 | |
d20ef63d JB |
2428 | WARN_ON_ONCE(softirq_count() == 0); |
2429 | ||
77a980dc JB |
2430 | if (WARN_ON(status->band < 0 || |
2431 | status->band >= IEEE80211_NUM_BANDS)) | |
2432 | goto drop; | |
8318d78a JB |
2433 | |
2434 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2435 | if (WARN_ON(!sband)) |
2436 | goto drop; | |
8318d78a | 2437 | |
89c3a8ac JB |
2438 | /* |
2439 | * If we're suspending, it is possible although not too likely | |
2440 | * that we'd be receiving frames after having already partially | |
2441 | * quiesced the stack. We can't process such frames then since | |
2442 | * that might, for example, cause stations to be added or other | |
2443 | * driver callbacks be invoked. | |
2444 | */ | |
77a980dc JB |
2445 | if (unlikely(local->quiescing || local->suspended)) |
2446 | goto drop; | |
89c3a8ac | 2447 | |
ea77f12f JB |
2448 | /* |
2449 | * The same happens when we're not even started, | |
2450 | * but that's worth a warning. | |
2451 | */ | |
77a980dc JB |
2452 | if (WARN_ON(!local->started)) |
2453 | goto drop; | |
ea77f12f | 2454 | |
0fb8ca45 | 2455 | if (status->flag & RX_FLAG_HT) { |
e5d6eb83 LR |
2456 | /* |
2457 | * rate_idx is MCS index, which can be [0-76] as documented on: | |
2458 | * | |
2459 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
2460 | * | |
2461 | * Anything else would be some sort of driver or hardware error. | |
2462 | * The driver should catch hardware errors. | |
2463 | */ | |
2464 | if (WARN((status->rate_idx < 0 || | |
2465 | status->rate_idx > 76), | |
2466 | "Rate marked as an HT rate but passed " | |
2467 | "status->rate_idx is not " | |
2468 | "an MCS index [0-76]: %d (0x%02x)\n", | |
2469 | status->rate_idx, | |
2470 | status->rate_idx)) | |
77a980dc | 2471 | goto drop; |
0fb8ca45 JM |
2472 | } else { |
2473 | if (WARN_ON(status->rate_idx < 0 || | |
2474 | status->rate_idx >= sband->n_bitrates)) | |
77a980dc | 2475 | goto drop; |
0fb8ca45 JM |
2476 | rate = &sband->bitrates[status->rate_idx]; |
2477 | } | |
6368e4b1 RR |
2478 | |
2479 | /* | |
2480 | * key references and virtual interfaces are protected using RCU | |
2481 | * and this requires that we are in a read-side RCU section during | |
2482 | * receive processing | |
2483 | */ | |
2484 | rcu_read_lock(); | |
2485 | ||
2486 | /* | |
2487 | * Frames with failed FCS/PLCP checksum are not returned, | |
2488 | * all other frames are returned without radiotap header | |
2489 | * if it was previously present. | |
2490 | * Also, frames with less than 16 bytes are dropped. | |
2491 | */ | |
f1d58c25 | 2492 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2493 | if (!skb) { |
2494 | rcu_read_unlock(); | |
2495 | return; | |
2496 | } | |
2497 | ||
aec67952 JM |
2498 | /* |
2499 | * In theory, the block ack reordering should happen after duplicate | |
2500 | * removal (ieee80211_rx_h_check(), which is an RX handler). As such, | |
2501 | * the call to ieee80211_rx_reorder_ampdu() should really be moved to | |
2502 | * happen as a new RX handler between ieee80211_rx_h_check and | |
2503 | * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for | |
2504 | * the time being, the call can be here since RX reorder buf processing | |
2505 | * will implicitly skip duplicates. We could, in theory at least, | |
2506 | * process frames that ieee80211_rx_h_passive_scan would drop (e.g., | |
2507 | * frames from other than operational channel), but that should not | |
2508 | * happen in normal networks. | |
2509 | */ | |
f1d58c25 JB |
2510 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
2511 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
6368e4b1 RR |
2512 | |
2513 | rcu_read_unlock(); | |
77a980dc JB |
2514 | |
2515 | return; | |
2516 | drop: | |
2517 | kfree_skb(skb); | |
6368e4b1 | 2518 | } |
103bf9f7 | 2519 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2520 | |
2521 | /* This is a version of the rx handler that can be called from hard irq | |
2522 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2523 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2524 | { |
2525 | struct ieee80211_local *local = hw_to_local(hw); | |
2526 | ||
2527 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2528 | ||
571ecf67 JB |
2529 | skb->pkt_type = IEEE80211_RX_MSG; |
2530 | skb_queue_tail(&local->skb_queue, skb); | |
2531 | tasklet_schedule(&local->tasklet); | |
2532 | } | |
2533 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |