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Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
c6a1fa12 JB |
30 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
31 | struct tid_ampdu_rx *tid_agg_rx, | |
32 | struct sk_buff *skb, | |
33 | u16 mpdu_seq_num, | |
34 | int bar_req); | |
b2e7771e JB |
35 | /* |
36 | * monitor mode reception | |
37 | * | |
38 | * This function cleans up the SKB, i.e. it removes all the stuff | |
39 | * only useful for monitoring. | |
40 | */ | |
41 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
0869aea0 | 42 | struct sk_buff *skb) |
b2e7771e | 43 | { |
b2e7771e JB |
44 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
45 | if (likely(skb->len > FCS_LEN)) | |
46 | skb_trim(skb, skb->len - FCS_LEN); | |
47 | else { | |
48 | /* driver bug */ | |
49 | WARN_ON(1); | |
50 | dev_kfree_skb(skb); | |
51 | skb = NULL; | |
52 | } | |
53 | } | |
54 | ||
55 | return skb; | |
56 | } | |
57 | ||
f1d58c25 | 58 | static inline int should_drop_frame(struct sk_buff *skb, |
0869aea0 | 59 | int present_fcs_len) |
b2e7771e | 60 | { |
f1d58c25 | 61 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 62 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
63 | |
64 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
65 | return 1; | |
0869aea0 | 66 | if (unlikely(skb->len < 16 + present_fcs_len)) |
b2e7771e | 67 | return 1; |
87228f57 HH |
68 | if (ieee80211_is_ctl(hdr->frame_control) && |
69 | !ieee80211_is_pspoll(hdr->frame_control) && | |
70 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
71 | return 1; |
72 | return 0; | |
73 | } | |
74 | ||
601ae7f2 BR |
75 | static int |
76 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
77 | struct ieee80211_rx_status *status) | |
78 | { | |
79 | int len; | |
80 | ||
81 | /* always present fields */ | |
82 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
83 | ||
84 | if (status->flag & RX_FLAG_TSFT) | |
85 | len += 8; | |
7fee5372 | 86 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
87 | len += 1; |
88 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
89 | len += 1; | |
90 | ||
91 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
92 | len++; | |
93 | ||
601ae7f2 BR |
94 | return len; |
95 | } | |
96 | ||
d1c3a37c | 97 | /* |
601ae7f2 BR |
98 | * ieee80211_add_rx_radiotap_header - add radiotap header |
99 | * | |
100 | * add a radiotap header containing all the fields which the hardware provided. | |
101 | */ | |
102 | static void | |
103 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
104 | struct sk_buff *skb, | |
601ae7f2 BR |
105 | struct ieee80211_rate *rate, |
106 | int rtap_len) | |
107 | { | |
f1d58c25 | 108 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
109 | struct ieee80211_radiotap_header *rthdr; |
110 | unsigned char *pos; | |
6a86b9c7 | 111 | u16 rx_flags = 0; |
601ae7f2 BR |
112 | |
113 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
114 | memset(rthdr, 0, rtap_len); | |
115 | ||
116 | /* radiotap header, set always present flags */ | |
117 | rthdr->it_present = | |
118 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
119 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
120 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
121 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
122 | rthdr->it_len = cpu_to_le16(rtap_len); | |
123 | ||
124 | pos = (unsigned char *)(rthdr+1); | |
125 | ||
126 | /* the order of the following fields is important */ | |
127 | ||
128 | /* IEEE80211_RADIOTAP_TSFT */ | |
129 | if (status->flag & RX_FLAG_TSFT) { | |
6a86b9c7 | 130 | put_unaligned_le64(status->mactime, pos); |
601ae7f2 BR |
131 | rthdr->it_present |= |
132 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
133 | pos += 8; | |
134 | } | |
135 | ||
136 | /* IEEE80211_RADIOTAP_FLAGS */ | |
137 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
138 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
139 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
140 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
141 | if (status->flag & RX_FLAG_SHORTPRE) |
142 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
143 | pos++; |
144 | ||
145 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
146 | if (status->flag & RX_FLAG_HT) { |
147 | /* | |
148 | * TODO: add following information into radiotap header once | |
149 | * suitable fields are defined for it: | |
150 | * - MCS index (status->rate_idx) | |
151 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
152 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
153 | */ | |
154 | *pos = 0; | |
8d6f658e | 155 | } else { |
ebe6c7ba | 156 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 157 | *pos = rate->bitrate / 5; |
8d6f658e | 158 | } |
601ae7f2 BR |
159 | pos++; |
160 | ||
161 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
6a86b9c7 | 162 | put_unaligned_le16(status->freq, pos); |
601ae7f2 BR |
163 | pos += 2; |
164 | if (status->band == IEEE80211_BAND_5GHZ) | |
6a86b9c7 JB |
165 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
166 | pos); | |
9deb1ae5 | 167 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
6a86b9c7 JB |
168 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
169 | pos); | |
601ae7f2 | 170 | else |
6a86b9c7 JB |
171 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
172 | pos); | |
601ae7f2 BR |
173 | pos += 2; |
174 | ||
175 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
176 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
177 | *pos = status->signal; | |
178 | rthdr->it_present |= | |
179 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
180 | pos++; | |
181 | } | |
182 | ||
183 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
184 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
185 | *pos = status->noise; | |
186 | rthdr->it_present |= | |
187 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
188 | pos++; | |
189 | } | |
190 | ||
191 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
192 | ||
193 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
194 | *pos = status->antenna; | |
195 | pos++; | |
196 | ||
601ae7f2 BR |
197 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
198 | ||
199 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
200 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
6a86b9c7 | 201 | if ((pos - (u8 *)rthdr) & 1) |
601ae7f2 | 202 | pos++; |
aae89831 | 203 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
6a86b9c7 JB |
204 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
205 | put_unaligned_le16(rx_flags, pos); | |
601ae7f2 BR |
206 | pos += 2; |
207 | } | |
208 | ||
b2e7771e JB |
209 | /* |
210 | * This function copies a received frame to all monitor interfaces and | |
211 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
212 | * radiotap header the driver might have added. | |
213 | */ | |
214 | static struct sk_buff * | |
215 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 216 | struct ieee80211_rate *rate) |
b2e7771e | 217 | { |
f1d58c25 | 218 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 219 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 220 | int needed_headroom = 0; |
b2e7771e JB |
221 | struct sk_buff *skb, *skb2; |
222 | struct net_device *prev_dev = NULL; | |
223 | int present_fcs_len = 0; | |
b2e7771e JB |
224 | |
225 | /* | |
226 | * First, we may need to make a copy of the skb because | |
227 | * (1) we need to modify it for radiotap (if not present), and | |
228 | * (2) the other RX handlers will modify the skb we got. | |
229 | * | |
230 | * We don't need to, of course, if we aren't going to return | |
231 | * the SKB because it has a bad FCS/PLCP checksum. | |
232 | */ | |
0869aea0 JB |
233 | |
234 | /* room for the radiotap header based on driver features */ | |
235 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
236 | |
237 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
238 | present_fcs_len = FCS_LEN; | |
239 | ||
240 | if (!local->monitors) { | |
0869aea0 | 241 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
242 | dev_kfree_skb(origskb); |
243 | return NULL; | |
244 | } | |
245 | ||
0869aea0 | 246 | return remove_monitor_info(local, origskb); |
b2e7771e JB |
247 | } |
248 | ||
0869aea0 | 249 | if (should_drop_frame(origskb, present_fcs_len)) { |
b2e7771e JB |
250 | /* only need to expand headroom if necessary */ |
251 | skb = origskb; | |
252 | origskb = NULL; | |
253 | ||
254 | /* | |
255 | * This shouldn't trigger often because most devices have an | |
256 | * RX header they pull before we get here, and that should | |
257 | * be big enough for our radiotap information. We should | |
258 | * probably export the length to drivers so that we can have | |
259 | * them allocate enough headroom to start with. | |
260 | */ | |
261 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 262 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
263 | dev_kfree_skb(skb); |
264 | return NULL; | |
265 | } | |
266 | } else { | |
267 | /* | |
268 | * Need to make a copy and possibly remove radiotap header | |
269 | * and FCS from the original. | |
270 | */ | |
271 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
272 | ||
0869aea0 | 273 | origskb = remove_monitor_info(local, origskb); |
b2e7771e JB |
274 | |
275 | if (!skb) | |
276 | return origskb; | |
277 | } | |
278 | ||
0869aea0 JB |
279 | /* prepend radiotap information */ |
280 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); | |
b2e7771e | 281 | |
ce3edf6d | 282 | skb_reset_mac_header(skb); |
b2e7771e JB |
283 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
284 | skb->pkt_type = PACKET_OTHERHOST; | |
285 | skb->protocol = htons(ETH_P_802_2); | |
286 | ||
287 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
288 | if (!netif_running(sdata->dev)) | |
289 | continue; | |
290 | ||
05c914fe | 291 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
292 | continue; |
293 | ||
3d30d949 MW |
294 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
295 | continue; | |
296 | ||
b2e7771e JB |
297 | if (prev_dev) { |
298 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
299 | if (skb2) { | |
300 | skb2->dev = prev_dev; | |
301 | netif_rx(skb2); | |
302 | } | |
303 | } | |
304 | ||
305 | prev_dev = sdata->dev; | |
306 | sdata->dev->stats.rx_packets++; | |
307 | sdata->dev->stats.rx_bytes += skb->len; | |
308 | } | |
309 | ||
310 | if (prev_dev) { | |
311 | skb->dev = prev_dev; | |
312 | netif_rx(skb); | |
313 | } else | |
314 | dev_kfree_skb(skb); | |
315 | ||
316 | return origskb; | |
317 | } | |
318 | ||
319 | ||
5cf121c3 | 320 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 321 | { |
238f74a2 | 322 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
323 | int tid; |
324 | ||
325 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
326 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
327 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 328 | /* frame has qos control */ |
238f74a2 HH |
329 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
330 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 331 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 332 | else |
5cf121c3 | 333 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 334 | } else { |
1411f9b5 JB |
335 | /* |
336 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
337 | * | |
338 | * Sequence numbers for management frames, QoS data | |
339 | * frames with a broadcast/multicast address in the | |
340 | * Address 1 field, and all non-QoS data frames sent | |
341 | * by QoS STAs are assigned using an additional single | |
342 | * modulo-4096 counter, [...] | |
343 | * | |
344 | * We also use that counter for non-QoS STAs. | |
345 | */ | |
346 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 347 | } |
52865dfd | 348 | |
5cf121c3 | 349 | rx->queue = tid; |
6e0d114d JB |
350 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
351 | * For now, set skb->priority to 0 for other cases. */ | |
352 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 353 | } |
6e0d114d | 354 | |
d1c3a37c JB |
355 | /** |
356 | * DOC: Packet alignment | |
357 | * | |
358 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
359 | * to the stack. | |
360 | * | |
361 | * Additionally, should, if possible, align the payload data in a way that | |
362 | * guarantees that the contained IP header is aligned to a four-byte | |
363 | * boundary. In the case of regular frames, this simply means aligning the | |
364 | * payload to a four-byte boundary (because either the IP header is directly | |
365 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
366 | * in front of it). | |
367 | * | |
368 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
369 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
370 | * push the IP header further back to a multiple of four again. Thankfully, the | |
371 | * specs were sane enough this time around to require padding each A-MSDU | |
372 | * subframe to a length that is a multiple of four. | |
373 | * | |
374 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
375 | * the payload is not supported, the driver is required to move the 802.11 | |
376 | * header to be directly in front of the payload in that case. | |
377 | */ | |
378 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 379 | { |
a7767f95 | 380 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
381 | int hdrlen; |
382 | ||
d1c3a37c JB |
383 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
384 | return; | |
385 | #endif | |
386 | ||
387 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
388 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
389 | return; | |
390 | ||
a7767f95 | 391 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
392 | return; |
393 | ||
a7767f95 | 394 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 395 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 396 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
397 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
398 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
399 | } |
400 | ||
6368e4b1 | 401 | |
571ecf67 JB |
402 | /* rx handlers */ |
403 | ||
49461622 | 404 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 405 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
406 | { |
407 | struct ieee80211_local *local = rx->local; | |
408 | struct sk_buff *skb = rx->skb; | |
409 | ||
fbe9c429 | 410 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 411 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 412 | |
142b9f50 HS |
413 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
414 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 415 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 416 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 417 | dev_kfree_skb(skb); |
9ae54c84 | 418 | return RX_QUEUED; |
571ecf67 JB |
419 | } |
420 | ||
5cf121c3 | 421 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
422 | /* scanning finished during invoking of handlers */ |
423 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 424 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
425 | } |
426 | ||
9ae54c84 | 427 | return RX_CONTINUE; |
571ecf67 JB |
428 | } |
429 | ||
3cfcf6ac JM |
430 | |
431 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
432 | { | |
433 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
434 | ||
435 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
436 | return 0; | |
437 | ||
438 | return ieee80211_is_robust_mgmt_frame(hdr); | |
439 | } | |
440 | ||
441 | ||
442 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
443 | { | |
444 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
445 | ||
446 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
447 | return 0; | |
448 | ||
449 | return ieee80211_is_robust_mgmt_frame(hdr); | |
450 | } | |
451 | ||
452 | ||
453 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
454 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
455 | { | |
456 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
457 | struct ieee80211_mmie *mmie; | |
458 | ||
459 | if (skb->len < 24 + sizeof(*mmie) || | |
460 | !is_multicast_ether_addr(hdr->da)) | |
461 | return -1; | |
462 | ||
463 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
464 | return -1; /* not a robust management frame */ | |
465 | ||
466 | mmie = (struct ieee80211_mmie *) | |
467 | (skb->data + skb->len - sizeof(*mmie)); | |
468 | if (mmie->element_id != WLAN_EID_MMIE || | |
469 | mmie->length != sizeof(*mmie) - 2) | |
470 | return -1; | |
471 | ||
472 | return le16_to_cpu(mmie->key_id); | |
473 | } | |
474 | ||
475 | ||
33b64eb2 | 476 | static ieee80211_rx_result |
5cf121c3 | 477 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 478 | { |
a7767f95 HH |
479 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
480 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
3c5772a5 | 481 | char *dev_addr = rx->dev->dev_addr; |
d6d1a5a7 | 482 | |
a7767f95 | 483 | if (ieee80211_is_data(hdr->frame_control)) { |
3c5772a5 JC |
484 | if (is_multicast_ether_addr(hdr->addr1)) { |
485 | if (ieee80211_has_tods(hdr->frame_control) || | |
486 | !ieee80211_has_fromds(hdr->frame_control)) | |
487 | return RX_DROP_MONITOR; | |
488 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) | |
489 | return RX_DROP_MONITOR; | |
490 | } else { | |
491 | if (!ieee80211_has_a4(hdr->frame_control)) | |
492 | return RX_DROP_MONITOR; | |
493 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) | |
494 | return RX_DROP_MONITOR; | |
495 | } | |
33b64eb2 LCC |
496 | } |
497 | ||
498 | /* If there is not an established peer link and this is not a peer link | |
499 | * establisment frame, beacon or probe, drop the frame. | |
500 | */ | |
501 | ||
b4e08ea1 | 502 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 503 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 504 | |
a7767f95 | 505 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
506 | return RX_DROP_MONITOR; |
507 | ||
a7767f95 | 508 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
509 | mgmt = (struct ieee80211_mgmt *)hdr; |
510 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
511 | return RX_DROP_MONITOR; | |
33b64eb2 | 512 | return RX_CONTINUE; |
33b64eb2 LCC |
513 | } |
514 | ||
a7767f95 HH |
515 | if (ieee80211_is_probe_req(hdr->frame_control) || |
516 | ieee80211_is_probe_resp(hdr->frame_control) || | |
517 | ieee80211_is_beacon(hdr->frame_control)) | |
518 | return RX_CONTINUE; | |
519 | ||
520 | return RX_DROP_MONITOR; | |
521 | ||
522 | } | |
523 | ||
524 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
525 | ||
526 | if (ieee80211_is_data(hdr->frame_control) && | |
527 | is_multicast_ether_addr(hdr->addr1) && | |
3c5772a5 | 528 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 529 | return RX_DROP_MONITOR; |
902acc78 | 530 | #undef msh_h_get |
d6d1a5a7 | 531 | |
902acc78 JB |
532 | return RX_CONTINUE; |
533 | } | |
33b64eb2 LCC |
534 | |
535 | ||
49461622 | 536 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 537 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 538 | { |
a7767f95 | 539 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
540 | |
541 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
542 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 543 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 544 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 545 | hdr->seq_ctrl)) { |
5cf121c3 | 546 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
547 | rx->local->dot11FrameDuplicateCount++; |
548 | rx->sta->num_duplicates++; | |
549 | } | |
e4c26add | 550 | return RX_DROP_MONITOR; |
571ecf67 | 551 | } else |
5cf121c3 | 552 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
553 | } |
554 | ||
571ecf67 JB |
555 | if (unlikely(rx->skb->len < 16)) { |
556 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 557 | return RX_DROP_MONITOR; |
571ecf67 JB |
558 | } |
559 | ||
571ecf67 JB |
560 | /* Drop disallowed frame classes based on STA auth/assoc state; |
561 | * IEEE 802.11, Chap 5.5. | |
562 | * | |
ccd7b362 JB |
563 | * mac80211 filters only based on association state, i.e. it drops |
564 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
565 | * deauth/disassoc frames when needed. In addition, hostapd is |
566 | * responsible for filtering on both auth and assoc states. | |
567 | */ | |
33b64eb2 | 568 | |
902acc78 | 569 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 570 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 571 | |
a7767f95 HH |
572 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
573 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 574 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 575 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
576 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
577 | !ieee80211_has_tods(hdr->frame_control) && | |
578 | ieee80211_is_data(hdr->frame_control)) || | |
579 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
580 | /* Drop IBSS frames and frames for other hosts |
581 | * silently. */ | |
e4c26add | 582 | return RX_DROP_MONITOR; |
571ecf67 JB |
583 | } |
584 | ||
e4c26add | 585 | return RX_DROP_MONITOR; |
571ecf67 JB |
586 | } |
587 | ||
9ae54c84 | 588 | return RX_CONTINUE; |
570bd537 JB |
589 | } |
590 | ||
591 | ||
49461622 | 592 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 593 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 594 | { |
a7767f95 | 595 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
596 | int keyidx; |
597 | int hdrlen; | |
e4c26add | 598 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 599 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 600 | int mmie_keyidx = -1; |
570bd537 | 601 | |
3017b80b JB |
602 | /* |
603 | * Key selection 101 | |
604 | * | |
3cfcf6ac | 605 | * There are four types of keys: |
3017b80b | 606 | * - GTK (group keys) |
3cfcf6ac | 607 | * - IGTK (group keys for management frames) |
3017b80b JB |
608 | * - PTK (pairwise keys) |
609 | * - STK (station-to-station pairwise keys) | |
610 | * | |
611 | * When selecting a key, we have to distinguish between multicast | |
612 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
613 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
614 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
615 | * unicast frames can also use key indices like GTKs. Hence, if we | |
616 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 617 | * |
8dc06a1c JB |
618 | * Note that in a regular BSS, multicast frames are sent by the |
619 | * AP only, associated stations unicast the frame to the AP first | |
620 | * which then multicasts it on their behalf. | |
621 | * | |
3017b80b JB |
622 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
623 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
624 | * The spec seems to expect that one negotiates the same key with |
625 | * every station but there's no such requirement; VLANs could be | |
626 | * possible. | |
3017b80b JB |
627 | */ |
628 | ||
3017b80b | 629 | /* |
1990af8d | 630 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
631 | * addressed to us nor a multicast frame. |
632 | */ | |
5cf121c3 | 633 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 634 | return RX_CONTINUE; |
3017b80b | 635 | |
d4e46a3d JB |
636 | if (rx->sta) |
637 | stakey = rcu_dereference(rx->sta->key); | |
638 | ||
0c7c10c7 JM |
639 | if (!ieee80211_has_protected(hdr->frame_control)) |
640 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
641 | ||
d4e46a3d JB |
642 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
643 | rx->key = stakey; | |
0c7c10c7 JM |
644 | /* Skip decryption if the frame is not protected. */ |
645 | if (!ieee80211_has_protected(hdr->frame_control)) | |
646 | return RX_CONTINUE; | |
3cfcf6ac JM |
647 | } else if (mmie_keyidx >= 0) { |
648 | /* Broadcast/multicast robust management frame / BIP */ | |
649 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && | |
650 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
651 | return RX_CONTINUE; | |
652 | ||
653 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
654 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
655 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
656 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
657 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
658 | /* | |
659 | * The frame was not protected, so skip decryption. However, we | |
660 | * need to set rx->key if there is a key that could have been | |
661 | * used so that the frame may be dropped if encryption would | |
662 | * have been expected. | |
663 | */ | |
664 | struct ieee80211_key *key = NULL; | |
665 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
666 | is_multicast_ether_addr(hdr->addr1) && | |
667 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
668 | rx->key = key; | |
669 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
670 | rx->key = key; | |
671 | return RX_CONTINUE; | |
571ecf67 | 672 | } else { |
3017b80b JB |
673 | /* |
674 | * The device doesn't give us the IV so we won't be | |
675 | * able to look up the key. That's ok though, we | |
676 | * don't need to decrypt the frame, we just won't | |
677 | * be able to keep statistics accurate. | |
678 | * Except for key threshold notifications, should | |
679 | * we somehow allow the driver to tell us which key | |
680 | * the hardware used if this flag is set? | |
681 | */ | |
5cf121c3 JB |
682 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
683 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 684 | return RX_CONTINUE; |
3017b80b | 685 | |
a7767f95 | 686 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
687 | |
688 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 689 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
690 | |
691 | /* | |
692 | * no need to call ieee80211_wep_get_keyidx, | |
693 | * it verifies a bunch of things we've done already | |
694 | */ | |
695 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
696 | ||
d4e46a3d | 697 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
698 | |
699 | /* | |
700 | * RSNA-protected unicast frames should always be sent with | |
701 | * pairwise or station-to-station keys, but for WEP we allow | |
702 | * using a key index as well. | |
703 | */ | |
8f20fc24 | 704 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
705 | !is_multicast_ether_addr(hdr->addr1)) |
706 | rx->key = NULL; | |
571ecf67 JB |
707 | } |
708 | ||
3017b80b | 709 | if (rx->key) { |
571ecf67 | 710 | rx->key->tx_rx_count++; |
011bfcc4 | 711 | /* TODO: add threshold stuff again */ |
1990af8d | 712 | } else { |
e4c26add | 713 | return RX_DROP_MONITOR; |
70f08765 JB |
714 | } |
715 | ||
1990af8d JB |
716 | /* Check for weak IVs if possible */ |
717 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 718 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
719 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
720 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
721 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
722 | rx->sta->wep_weak_iv_count++; | |
723 | ||
70f08765 JB |
724 | switch (rx->key->conf.alg) { |
725 | case ALG_WEP: | |
e2f036da MN |
726 | result = ieee80211_crypto_wep_decrypt(rx); |
727 | break; | |
70f08765 | 728 | case ALG_TKIP: |
e2f036da MN |
729 | result = ieee80211_crypto_tkip_decrypt(rx); |
730 | break; | |
70f08765 | 731 | case ALG_CCMP: |
e2f036da MN |
732 | result = ieee80211_crypto_ccmp_decrypt(rx); |
733 | break; | |
3cfcf6ac JM |
734 | case ALG_AES_CMAC: |
735 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
736 | break; | |
70f08765 JB |
737 | } |
738 | ||
e2f036da | 739 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 740 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
741 | |
742 | return result; | |
70f08765 JB |
743 | } |
744 | ||
572e0012 KV |
745 | static ieee80211_rx_result debug_noinline |
746 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
747 | { | |
748 | struct ieee80211_local *local; | |
749 | struct ieee80211_hdr *hdr; | |
750 | struct sk_buff *skb; | |
751 | ||
752 | local = rx->local; | |
753 | skb = rx->skb; | |
754 | hdr = (struct ieee80211_hdr *) skb->data; | |
755 | ||
756 | if (!local->pspolling) | |
757 | return RX_CONTINUE; | |
758 | ||
759 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
760 | /* this is not from AP */ | |
761 | return RX_CONTINUE; | |
762 | ||
763 | if (!ieee80211_is_data(hdr->frame_control)) | |
764 | return RX_CONTINUE; | |
765 | ||
766 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
767 | /* AP has no more frames buffered for us */ | |
768 | local->pspolling = false; | |
769 | return RX_CONTINUE; | |
770 | } | |
771 | ||
772 | /* more data bit is set, let's request a new frame from the AP */ | |
773 | ieee80211_send_pspoll(local, rx->sdata); | |
774 | ||
775 | return RX_CONTINUE; | |
776 | } | |
777 | ||
133b8226 | 778 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 779 | { |
133b8226 | 780 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 781 | struct ieee80211_local *local = sdata->local; |
0795af57 | 782 | |
3e122be0 | 783 | atomic_inc(&sdata->bss->num_sta_ps); |
3fa52056 | 784 | set_sta_flags(sta, WLAN_STA_PS); |
24487981 | 785 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 786 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
787 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
788 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
789 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
790 | } | |
791 | ||
133b8226 | 792 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 793 | { |
133b8226 JB |
794 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
795 | struct ieee80211_local *local = sdata->local; | |
8f77f384 | 796 | int sent, buffered; |
571ecf67 | 797 | |
3e122be0 | 798 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 799 | |
3fa52056 | 800 | clear_sta_flags(sta, WLAN_STA_PS); |
24487981 | 801 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta); |
004c872e JB |
802 | |
803 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
804 | sta_info_clear_tim_bit(sta); | |
805 | ||
571ecf67 | 806 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
807 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
808 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 809 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 810 | |
571ecf67 | 811 | /* Send all buffered frames to the station */ |
8f77f384 JB |
812 | sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); |
813 | buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); | |
814 | sent += buffered; | |
815 | local->total_ps_buffered -= buffered; | |
816 | ||
571ecf67 | 817 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
8f77f384 JB |
818 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " |
819 | "since STA not sleeping anymore\n", sdata->dev->name, | |
820 | sta->sta.addr, sta->sta.aid, sent - buffered, buffered); | |
571ecf67 | 821 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
822 | |
823 | return sent; | |
824 | } | |
825 | ||
49461622 | 826 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 827 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
828 | { |
829 | struct sta_info *sta = rx->sta; | |
a7767f95 | 830 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
831 | |
832 | if (!sta) | |
9ae54c84 | 833 | return RX_CONTINUE; |
571ecf67 | 834 | |
b291ba11 JB |
835 | /* |
836 | * Update last_rx only for IBSS packets which are for the current | |
837 | * BSSID to avoid keeping the current IBSS network alive in cases | |
838 | * where other STAs start using different BSSID. | |
839 | */ | |
05c914fe | 840 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 841 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 842 | NL80211_IFTYPE_ADHOC); |
46900298 | 843 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 844 | sta->last_rx = jiffies; |
b291ba11 JB |
845 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
846 | /* | |
33b64eb2 LCC |
847 | * Mesh beacons will update last_rx when if they are found to |
848 | * match the current local configuration when processed. | |
571ecf67 | 849 | */ |
b291ba11 | 850 | sta->last_rx = jiffies; |
571ecf67 JB |
851 | } |
852 | ||
5cf121c3 | 853 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 854 | return RX_CONTINUE; |
571ecf67 | 855 | |
3cf335d5 KV |
856 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
857 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
858 | ||
571ecf67 JB |
859 | sta->rx_fragments++; |
860 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 861 | sta->last_signal = rx->status->signal; |
566bfe5a | 862 | sta->last_qual = rx->status->qual; |
5cf121c3 | 863 | sta->last_noise = rx->status->noise; |
571ecf67 | 864 | |
72eaa43a JB |
865 | /* |
866 | * Change STA power saving mode only at the end of a frame | |
867 | * exchange sequence. | |
868 | */ | |
3e122be0 | 869 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
870 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
871 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
872 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
873 | /* | |
874 | * Ignore doze->wake transitions that are | |
875 | * indicated by non-data frames, the standard | |
876 | * is unclear here, but for example going to | |
877 | * PS mode and then scanning would cause a | |
878 | * doze->wake transition for the probe request, | |
879 | * and that is clearly undesirable. | |
880 | */ | |
881 | if (ieee80211_is_data(hdr->frame_control) && | |
882 | !ieee80211_has_pm(hdr->frame_control)) | |
883 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
884 | } else { | |
885 | if (ieee80211_has_pm(hdr->frame_control)) | |
886 | ap_sta_ps_start(sta); | |
887 | } | |
571ecf67 JB |
888 | } |
889 | ||
890 | /* Drop data::nullfunc frames silently, since they are used only to | |
891 | * control station power saving mode. */ | |
a7767f95 | 892 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
893 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
894 | /* Update counter and free packet here to avoid counting this | |
895 | * as a dropped packed. */ | |
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 | { |
98f0b0a3 | 1095 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1096 | struct sk_buff *skb; |
1097 | int no_pending_pkts; | |
358c8d9d | 1098 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1099 | |
358c8d9d | 1100 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1101 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1102 | return RX_CONTINUE; |
571ecf67 | 1103 | |
05c914fe JB |
1104 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1105 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1106 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1107 | |
571ecf67 JB |
1108 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1109 | if (!skb) { | |
1110 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1111 | if (skb) | |
1112 | rx->local->total_ps_buffered--; | |
1113 | } | |
1114 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1115 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1116 | ||
1117 | if (skb) { | |
3fa52056 | 1118 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
571ecf67 JB |
1119 | struct ieee80211_hdr *hdr = |
1120 | (struct ieee80211_hdr *) skb->data; | |
1121 | ||
4a9a66e9 | 1122 | /* |
3fa52056 | 1123 | * Tell TX path to send this frame even though the STA may |
4a9a66e9 JB |
1124 | * still remain is PS mode after this frame exchange. |
1125 | */ | |
3fa52056 | 1126 | info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE; |
571ecf67 JB |
1127 | |
1128 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1129 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1130 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1131 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1132 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1133 | ||
1134 | /* Use MoreData flag to indicate whether there are more | |
1135 | * buffered frames for this STA */ | |
836341a7 | 1136 | if (no_pending_pkts) |
571ecf67 | 1137 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1138 | else |
571ecf67 JB |
1139 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1140 | ||
3fa52056 | 1141 | ieee80211_add_pending_skb(rx->local, skb); |
571ecf67 | 1142 | |
004c872e JB |
1143 | if (no_pending_pkts) |
1144 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1145 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1146 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1147 | /* |
1148 | * FIXME: This can be the result of a race condition between | |
1149 | * us expiring a frame and the station polling for it. | |
1150 | * Should we send it a null-func frame indicating we | |
1151 | * have nothing buffered for it? | |
1152 | */ | |
0c68ae26 | 1153 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1154 | "though there are no buffered frames for it\n", |
0c68ae26 | 1155 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1156 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1157 | } |
1158 | ||
9ae54c84 | 1159 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1160 | * count as an dropped frame. */ |
1161 | dev_kfree_skb(rx->skb); | |
1162 | ||
9ae54c84 | 1163 | return RX_QUEUED; |
571ecf67 JB |
1164 | } |
1165 | ||
49461622 | 1166 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1167 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1168 | { |
6e0d114d | 1169 | u8 *data = rx->skb->data; |
238f74a2 | 1170 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1171 | |
238f74a2 | 1172 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1173 | return RX_CONTINUE; |
6e0d114d JB |
1174 | |
1175 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1176 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1177 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1178 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1179 | /* change frame type to non QOS */ |
238f74a2 | 1180 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1181 | |
9ae54c84 | 1182 | return RX_CONTINUE; |
6e0d114d JB |
1183 | } |
1184 | ||
76ee65bf | 1185 | static int |
5cf121c3 | 1186 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1187 | { |
07346f81 | 1188 | if (unlikely(!rx->sta || |
f4ea83dd | 1189 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1190 | return -EACCES; |
571ecf67 | 1191 | |
76ee65bf | 1192 | return 0; |
571ecf67 JB |
1193 | } |
1194 | ||
76ee65bf | 1195 | static int |
358c8d9d | 1196 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1197 | { |
3017b80b | 1198 | /* |
7848ba7d JB |
1199 | * Pass through unencrypted frames if the hardware has |
1200 | * decrypted them already. | |
3017b80b | 1201 | */ |
5cf121c3 | 1202 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1203 | return 0; |
571ecf67 JB |
1204 | |
1205 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1206 | if (unlikely(!ieee80211_has_protected(fc) && |
1207 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1208 | ieee80211_is_data(fc) && |
b3fc9c6c | 1209 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1210 | return -EACCES; |
f2ca3ea4 JM |
1211 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1212 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1213 | rx->key)) | |
1214 | return -EACCES; | |
1215 | /* BIP does not use Protected field, so need to check MMIE */ | |
1216 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) | |
1217 | && ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
1218 | rx->key)) | |
1219 | return -EACCES; | |
1220 | /* | |
1221 | * When using MFP, Action frames are not allowed prior to | |
1222 | * having configured keys. | |
1223 | */ | |
1224 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1225 | ieee80211_is_robust_mgmt_frame( | |
1226 | (struct ieee80211_hdr *) rx->skb->data))) | |
1227 | return -EACCES; | |
1228 | } | |
b3fc9c6c | 1229 | |
76ee65bf | 1230 | return 0; |
571ecf67 JB |
1231 | } |
1232 | ||
76ee65bf | 1233 | static int |
e31a16d6 | 1234 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1235 | { |
1236 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1237 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1238 | ||
e31a16d6 | 1239 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
76ee65bf | 1240 | } |
571ecf67 | 1241 | |
ce3edf6d JB |
1242 | /* |
1243 | * requires that rx->skb is a frame with ethernet header | |
1244 | */ | |
358c8d9d | 1245 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1246 | { |
c97c23e3 | 1247 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1248 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1249 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1250 | ||
1251 | /* | |
1252 | * Allow EAPOL frames to us/the PAE group address regardless | |
1253 | * of whether the frame was encrypted or not. | |
1254 | */ | |
1255 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1256 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1257 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1258 | return true; | |
1259 | ||
1260 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1261 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1262 | return false; |
1263 | ||
1264 | return true; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * requires that rx->skb is a frame with ethernet header | |
1269 | */ | |
76ee65bf | 1270 | static void |
5cf121c3 | 1271 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1272 | { |
1273 | struct net_device *dev = rx->dev; | |
1274 | struct ieee80211_local *local = rx->local; | |
1275 | struct sk_buff *skb, *xmit_skb; | |
1276 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1277 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1278 | struct sta_info *dsta; | |
571ecf67 | 1279 | |
76ee65bf RR |
1280 | skb = rx->skb; |
1281 | xmit_skb = NULL; | |
571ecf67 | 1282 | |
05c914fe JB |
1283 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1284 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1285 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1286 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1287 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1288 | /* | |
1289 | * send multicast frames both to higher layers in | |
1290 | * local net stack and back to the wireless medium | |
1291 | */ | |
76ee65bf RR |
1292 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1293 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1294 | printk(KERN_DEBUG "%s: failed to clone " |
1295 | "multicast frame\n", dev->name); | |
1296 | } else { | |
571ecf67 | 1297 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1298 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1299 | /* |
1300 | * The destination station is associated to | |
1301 | * this AP (in this VLAN), so send the frame | |
1302 | * directly to it and do not pass it to local | |
1303 | * net stack. | |
571ecf67 | 1304 | */ |
76ee65bf | 1305 | xmit_skb = skb; |
571ecf67 JB |
1306 | skb = NULL; |
1307 | } | |
571ecf67 JB |
1308 | } |
1309 | } | |
1310 | ||
1311 | if (skb) { | |
d1c3a37c JB |
1312 | int align __maybe_unused; |
1313 | ||
1314 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1315 | /* | |
1316 | * 'align' will only take the values 0 or 2 here | |
1317 | * since all frames are required to be aligned | |
1318 | * to 2-byte boundaries when being passed to | |
1319 | * mac80211. That also explains the __skb_push() | |
1320 | * below. | |
1321 | */ | |
dacb6f1d | 1322 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1323 | if (align) { |
1324 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1325 | dev_kfree_skb(skb); | |
1326 | skb = NULL; | |
1327 | } else { | |
1328 | u8 *data = skb->data; | |
1329 | size_t len = skb->len; | |
1330 | u8 *new = __skb_push(skb, align); | |
1331 | memmove(new, data, len); | |
1332 | __skb_trim(skb, len); | |
1333 | } | |
1334 | } | |
1335 | #endif | |
1336 | ||
1337 | if (skb) { | |
1338 | /* deliver to local stack */ | |
1339 | skb->protocol = eth_type_trans(skb, dev); | |
1340 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1341 | netif_rx(skb); | |
1342 | } | |
571ecf67 JB |
1343 | } |
1344 | ||
76ee65bf | 1345 | if (xmit_skb) { |
571ecf67 | 1346 | /* send to wireless media */ |
f831e909 | 1347 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1348 | skb_reset_network_header(xmit_skb); |
1349 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1350 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1351 | } |
76ee65bf RR |
1352 | } |
1353 | ||
49461622 | 1354 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1355 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1356 | { |
1357 | struct net_device *dev = rx->dev; | |
1358 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1359 | u16 ethertype; |
fd4c7f2f RR |
1360 | u8 *payload; |
1361 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1362 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1363 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1364 | const struct ethhdr *eth; |
1365 | int remaining, err; | |
1366 | u8 dst[ETH_ALEN]; | |
1367 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1368 | |
358c8d9d | 1369 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1370 | return RX_CONTINUE; |
fd4c7f2f | 1371 | |
358c8d9d | 1372 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1373 | return RX_DROP_MONITOR; |
fd4c7f2f | 1374 | |
5cf121c3 | 1375 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1376 | return RX_CONTINUE; |
fd4c7f2f | 1377 | |
e31a16d6 | 1378 | err = __ieee80211_data_to_8023(rx); |
fd4c7f2f | 1379 | if (unlikely(err)) |
e4c26add | 1380 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1381 | |
1382 | skb->dev = dev; | |
1383 | ||
1384 | dev->stats.rx_packets++; | |
1385 | dev->stats.rx_bytes += skb->len; | |
1386 | ||
1387 | /* skip the wrapping header */ | |
1388 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1389 | if (!eth) | |
e4c26add | 1390 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1391 | |
1392 | while (skb != frame) { | |
1393 | u8 padding; | |
1394 | __be16 len = eth->h_proto; | |
1395 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1396 | ||
1397 | remaining = skb->len; | |
1398 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1399 | memcpy(src, eth->h_source, ETH_ALEN); | |
1400 | ||
1401 | padding = ((4 - subframe_len) & 0x3); | |
1402 | /* the last MSDU has no padding */ | |
f4ea83dd | 1403 | if (subframe_len > remaining) |
e4c26add | 1404 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1405 | |
1406 | skb_pull(skb, sizeof(struct ethhdr)); | |
1407 | /* if last subframe reuse skb */ | |
1408 | if (remaining <= subframe_len + padding) | |
1409 | frame = skb; | |
1410 | else { | |
d1c3a37c JB |
1411 | /* |
1412 | * Allocate and reserve two bytes more for payload | |
1413 | * alignment since sizeof(struct ethhdr) is 14. | |
1414 | */ | |
1415 | frame = dev_alloc_skb( | |
1416 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1417 | subframe_len + 2); | |
fd4c7f2f RR |
1418 | |
1419 | if (frame == NULL) | |
e4c26add | 1420 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1421 | |
d1c3a37c JB |
1422 | skb_reserve(frame, |
1423 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1424 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1425 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1426 | ntohs(len)); | |
1427 | ||
1428 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1429 | padding); | |
1430 | if (!eth) { | |
fd4c7f2f | 1431 | dev_kfree_skb(frame); |
e4c26add | 1432 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1433 | } |
1434 | } | |
1435 | ||
ce3edf6d | 1436 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1437 | frame->dev = dev; |
1438 | frame->priority = skb->priority; | |
1439 | rx->skb = frame; | |
1440 | ||
fd4c7f2f RR |
1441 | payload = frame->data; |
1442 | ethertype = (payload[6] << 8) | payload[7]; | |
1443 | ||
1444 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1445 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1446 | compare_ether_addr(payload, | |
1447 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1448 | /* remove RFC1042 or Bridge-Tunnel |
1449 | * encapsulation and replace EtherType */ | |
1450 | skb_pull(frame, 6); | |
1451 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1452 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1453 | } else { | |
ce3edf6d JB |
1454 | memcpy(skb_push(frame, sizeof(__be16)), |
1455 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1456 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1457 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1458 | } | |
1459 | ||
358c8d9d | 1460 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1461 | if (skb == frame) /* last frame */ |
e4c26add | 1462 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1463 | dev_kfree_skb(frame); |
1464 | continue; | |
1465 | } | |
fd4c7f2f RR |
1466 | |
1467 | ieee80211_deliver_skb(rx); | |
1468 | } | |
1469 | ||
9ae54c84 | 1470 | return RX_QUEUED; |
fd4c7f2f RR |
1471 | } |
1472 | ||
bf94e17b | 1473 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1474 | static ieee80211_rx_result |
e32f85f7 LCC |
1475 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1476 | { | |
1477 | struct ieee80211_hdr *hdr; | |
1478 | struct ieee80211s_hdr *mesh_hdr; | |
1479 | unsigned int hdrlen; | |
1480 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1481 | struct ieee80211_local *local = rx->local; |
249b405c | 1482 | struct ieee80211_sub_if_data *sdata; |
e32f85f7 LCC |
1483 | |
1484 | hdr = (struct ieee80211_hdr *) skb->data; | |
1485 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1486 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
249b405c | 1487 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
e32f85f7 LCC |
1488 | |
1489 | if (!ieee80211_is_data(hdr->frame_control)) | |
1490 | return RX_CONTINUE; | |
1491 | ||
1492 | if (!mesh_hdr->ttl) | |
1493 | /* illegal frame */ | |
1494 | return RX_DROP_MONITOR; | |
1495 | ||
43b7b314 | 1496 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
79617dee | 1497 | struct mesh_path *mppath; |
43b7b314 JC |
1498 | char *proxied_addr; |
1499 | char *mpp_addr; | |
1500 | ||
1501 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1502 | mpp_addr = hdr->addr3; | |
1503 | proxied_addr = mesh_hdr->eaddr1; | |
1504 | } else { | |
1505 | mpp_addr = hdr->addr4; | |
1506 | proxied_addr = mesh_hdr->eaddr2; | |
1507 | } | |
79617dee | 1508 | |
79617dee | 1509 | rcu_read_lock(); |
43b7b314 | 1510 | mppath = mpp_path_lookup(proxied_addr, sdata); |
79617dee | 1511 | if (!mppath) { |
43b7b314 | 1512 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
79617dee Y |
1513 | } else { |
1514 | spin_lock_bh(&mppath->state_lock); | |
1515 | mppath->exp_time = jiffies; | |
43b7b314 JC |
1516 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
1517 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); | |
79617dee Y |
1518 | spin_unlock_bh(&mppath->state_lock); |
1519 | } | |
1520 | rcu_read_unlock(); | |
1521 | } | |
1522 | ||
3c5772a5 JC |
1523 | /* Frame has reached destination. Don't forward */ |
1524 | if (!is_multicast_ether_addr(hdr->addr1) && | |
1525 | compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) | |
e32f85f7 LCC |
1526 | return RX_CONTINUE; |
1527 | ||
1528 | mesh_hdr->ttl--; | |
1529 | ||
1530 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1531 | if (!mesh_hdr->ttl) | |
472dbc45 | 1532 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1533 | dropped_frames_ttl); |
1534 | else { | |
1535 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1536 | struct ieee80211_tx_info *info; |
1537 | ||
e32f85f7 LCC |
1538 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1539 | ||
1540 | if (!fwd_skb && net_ratelimit()) | |
1541 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1542 | rx->dev->name); | |
1543 | ||
1544 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
e32f85f7 | 1545 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); |
3b8d81e0 JB |
1546 | info = IEEE80211_SKB_CB(fwd_skb); |
1547 | memset(info, 0, sizeof(*info)); | |
1548 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1549 | info->control.vif = &rx->sdata->vif; |
3b8d81e0 | 1550 | ieee80211_select_queue(local, fwd_skb); |
c8a61a7d DW |
1551 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
1552 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1553 | fwded_mcast); | |
1554 | else { | |
3c5772a5 JC |
1555 | int err; |
1556 | /* | |
1557 | * Save TA to addr1 to send TA a path error if a | |
1558 | * suitable next hop is not found | |
1559 | */ | |
1560 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, | |
249b405c | 1561 | ETH_ALEN); |
3c5772a5 | 1562 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
249b405c JC |
1563 | /* Failed to immediately resolve next hop: |
1564 | * fwded frame was dropped or will be added | |
1565 | * later to the pending skb queue. */ | |
1566 | if (err) | |
1567 | return RX_DROP_MONITOR; | |
c8a61a7d DW |
1568 | |
1569 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1570 | fwded_unicast); | |
249b405c JC |
1571 | } |
1572 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1573 | fwded_frames); | |
3b8d81e0 | 1574 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1575 | } |
1576 | } | |
1577 | ||
3c5772a5 | 1578 | if (is_multicast_ether_addr(hdr->addr1) || |
e32f85f7 LCC |
1579 | rx->dev->flags & IFF_PROMISC) |
1580 | return RX_CONTINUE; | |
1581 | else | |
1582 | return RX_DROP_MONITOR; | |
1583 | } | |
bf94e17b | 1584 | #endif |
e32f85f7 | 1585 | |
49461622 | 1586 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1587 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1588 | { |
1589 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1590 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1591 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1592 | int err; |
76ee65bf | 1593 | |
358c8d9d | 1594 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1595 | return RX_CONTINUE; |
76ee65bf | 1596 | |
358c8d9d | 1597 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1598 | return RX_DROP_MONITOR; |
76ee65bf | 1599 | |
e31a16d6 | 1600 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1601 | if (unlikely(err)) |
e4c26add | 1602 | return RX_DROP_UNUSABLE; |
76ee65bf | 1603 | |
358c8d9d | 1604 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1605 | return RX_DROP_MONITOR; |
ce3edf6d | 1606 | |
76ee65bf RR |
1607 | rx->skb->dev = dev; |
1608 | ||
1609 | dev->stats.rx_packets++; | |
1610 | dev->stats.rx_bytes += rx->skb->len; | |
1611 | ||
1612 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1613 | |
9ae54c84 | 1614 | return RX_QUEUED; |
571ecf67 JB |
1615 | } |
1616 | ||
49461622 | 1617 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1618 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1619 | { |
1620 | struct ieee80211_local *local = rx->local; | |
1621 | struct ieee80211_hw *hw = &local->hw; | |
1622 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1623 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1624 | struct tid_ampdu_rx *tid_agg_rx; |
1625 | u16 start_seq_num; | |
1626 | u16 tid; | |
1627 | ||
a7767f95 | 1628 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1629 | return RX_CONTINUE; |
71364716 | 1630 | |
a7767f95 | 1631 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1632 | if (!rx->sta) |
9ae54c84 | 1633 | return RX_CONTINUE; |
71364716 | 1634 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1635 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1636 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1637 | return RX_CONTINUE; |
cee24a3e | 1638 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1639 | |
1640 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1641 | ||
1642 | /* reset session timer */ | |
20ad19d0 JB |
1643 | if (tid_agg_rx->timeout) |
1644 | mod_timer(&tid_agg_rx->session_timer, | |
1645 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1646 | |
1647 | /* manage reordering buffer according to requested */ | |
1648 | /* sequence number */ | |
1649 | rcu_read_lock(); | |
f1d58c25 | 1650 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, |
71364716 RR |
1651 | start_seq_num, 1); |
1652 | rcu_read_unlock(); | |
e4c26add | 1653 | return RX_DROP_UNUSABLE; |
71364716 RR |
1654 | } |
1655 | ||
9ae54c84 | 1656 | return RX_CONTINUE; |
71364716 RR |
1657 | } |
1658 | ||
f4f727a6 JM |
1659 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1660 | struct ieee80211_mgmt *mgmt, | |
1661 | size_t len) | |
fea14732 JM |
1662 | { |
1663 | struct ieee80211_local *local = sdata->local; | |
1664 | struct sk_buff *skb; | |
1665 | struct ieee80211_mgmt *resp; | |
1666 | ||
1667 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1668 | /* Not to own unicast address */ | |
1669 | return; | |
1670 | } | |
1671 | ||
46900298 JB |
1672 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1673 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1674 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1675 | return; |
1676 | } | |
1677 | ||
1678 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1679 | /* Too short SA Query request frame */ | |
1680 | return; | |
1681 | } | |
1682 | ||
1683 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1684 | if (skb == NULL) | |
1685 | return; | |
1686 | ||
1687 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1688 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1689 | memset(resp, 0, 24); | |
1690 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1691 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1692 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1693 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1694 | IEEE80211_STYPE_ACTION); | |
1695 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1696 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1697 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1698 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1699 | mgmt->u.action.u.sa_query.trans_id, | |
1700 | WLAN_SA_QUERY_TR_ID_LEN); | |
1701 | ||
1702 | ieee80211_tx_skb(sdata, skb, 1); | |
1703 | } | |
1704 | ||
de1ede7a JB |
1705 | static ieee80211_rx_result debug_noinline |
1706 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1707 | { | |
1708 | struct ieee80211_local *local = rx->local; | |
1709 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1710 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
1711 | int len = rx->skb->len; | |
1712 | ||
1713 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1714 | return RX_CONTINUE; | |
1715 | ||
1716 | if (!rx->sta) | |
1717 | return RX_DROP_MONITOR; | |
1718 | ||
1719 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1720 | return RX_DROP_MONITOR; | |
1721 | ||
97ebe12a JM |
1722 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1723 | return RX_DROP_MONITOR; | |
1724 | ||
de1ede7a JB |
1725 | /* all categories we currently handle have action_code */ |
1726 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1727 | return RX_DROP_MONITOR; | |
1728 | ||
de1ede7a JB |
1729 | switch (mgmt->u.action.category) { |
1730 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1731 | /* |
1732 | * The aggregation code is not prepared to handle | |
1733 | * anything but STA/AP due to the BSSID handling; | |
1734 | * IBSS could work in the code but isn't supported | |
1735 | * by drivers or the standard. | |
1736 | */ | |
1737 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1738 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1739 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1740 | return RX_DROP_MONITOR; | |
1741 | ||
de1ede7a JB |
1742 | switch (mgmt->u.action.u.addba_req.action_code) { |
1743 | case WLAN_ACTION_ADDBA_REQ: | |
1744 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1745 | sizeof(mgmt->u.action.u.addba_req))) | |
1746 | return RX_DROP_MONITOR; | |
1747 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1748 | break; | |
1749 | case WLAN_ACTION_ADDBA_RESP: | |
1750 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1751 | sizeof(mgmt->u.action.u.addba_resp))) | |
1752 | return RX_DROP_MONITOR; | |
1753 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1754 | break; | |
1755 | case WLAN_ACTION_DELBA: | |
1756 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1757 | sizeof(mgmt->u.action.u.delba))) | |
1758 | return RX_DROP_MONITOR; | |
1759 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1760 | break; | |
1761 | } | |
39192c0b JB |
1762 | break; |
1763 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1764 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1765 | return RX_DROP_MONITOR; | |
46900298 JB |
1766 | |
1767 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1768 | return RX_DROP_MONITOR; | |
1769 | ||
39192c0b JB |
1770 | switch (mgmt->u.action.u.measurement.action_code) { |
1771 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1772 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1773 | sizeof(mgmt->u.action.u.measurement))) | |
1774 | return RX_DROP_MONITOR; | |
1775 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1776 | break; | |
c481ec97 S |
1777 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1778 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1779 | sizeof(mgmt->u.action.u.chan_switch))) | |
1780 | return RX_DROP_MONITOR; | |
1781 | ||
cc32abd4 JB |
1782 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1783 | return RX_DROP_MONITOR; | |
1784 | ||
46900298 | 1785 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1786 | return RX_DROP_MONITOR; |
1787 | ||
77fdaa12 | 1788 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1789 | } |
1790 | break; | |
fea14732 JM |
1791 | case WLAN_CATEGORY_SA_QUERY: |
1792 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1793 | sizeof(mgmt->u.action.u.sa_query))) | |
1794 | return RX_DROP_MONITOR; | |
1795 | switch (mgmt->u.action.u.sa_query.action) { | |
1796 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1797 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1798 | return RX_DROP_MONITOR; | |
1799 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1800 | break; | |
1801 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1802 | /* | |
1803 | * SA Query response is currently only used in AP mode | |
1804 | * and it is processed in user space. | |
1805 | */ | |
1806 | return RX_CONTINUE; | |
1807 | } | |
1808 | break; | |
39192c0b JB |
1809 | default: |
1810 | return RX_CONTINUE; | |
de1ede7a JB |
1811 | } |
1812 | ||
39192c0b JB |
1813 | rx->sta->rx_packets++; |
1814 | dev_kfree_skb(rx->skb); | |
1815 | return RX_QUEUED; | |
de1ede7a JB |
1816 | } |
1817 | ||
49461622 | 1818 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1819 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1820 | { |
759ef3eb | 1821 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1822 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1823 | |
5cf121c3 | 1824 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1825 | return RX_DROP_MONITOR; |
571ecf67 | 1826 | |
97ebe12a JM |
1827 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1828 | return RX_DROP_MONITOR; | |
1829 | ||
472dbc45 | 1830 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 1831 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 1832 | |
3832c287 | 1833 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 1834 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 1835 | |
7986cf95 | 1836 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 1837 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 1838 | |
7986cf95 | 1839 | return RX_DROP_MONITOR; |
571ecf67 JB |
1840 | } |
1841 | ||
3b8d81e0 | 1842 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 1843 | struct ieee80211_rx_data *rx) |
571ecf67 | 1844 | { |
a7767f95 HH |
1845 | int keyidx; |
1846 | unsigned int hdrlen; | |
571ecf67 | 1847 | |
a7767f95 | 1848 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1849 | if (rx->skb->len >= hdrlen + 4) |
1850 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1851 | else | |
1852 | keyidx = -1; | |
1853 | ||
8944b79f | 1854 | if (!rx->sta) { |
aa0daf0e JB |
1855 | /* |
1856 | * Some hardware seem to generate incorrect Michael MIC | |
1857 | * reports; ignore them to avoid triggering countermeasures. | |
1858 | */ | |
571ecf67 JB |
1859 | goto ignore; |
1860 | } | |
1861 | ||
a7767f95 | 1862 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1863 | goto ignore; |
571ecf67 | 1864 | |
05c914fe | 1865 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1866 | /* |
1867 | * APs with pairwise keys should never receive Michael MIC | |
1868 | * errors for non-zero keyidx because these are reserved for | |
1869 | * group keys and only the AP is sending real multicast | |
1870 | * frames in the BSS. | |
1871 | */ | |
eb063c17 | 1872 | goto ignore; |
571ecf67 JB |
1873 | } |
1874 | ||
a7767f95 HH |
1875 | if (!ieee80211_is_data(hdr->frame_control) && |
1876 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1877 | goto ignore; |
571ecf67 | 1878 | |
e6d6e342 JB |
1879 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
1880 | GFP_ATOMIC); | |
571ecf67 JB |
1881 | ignore: |
1882 | dev_kfree_skb(rx->skb); | |
1883 | rx->skb = NULL; | |
1884 | } | |
1885 | ||
5cf121c3 JB |
1886 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1887 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1888 | { |
1889 | struct ieee80211_sub_if_data *sdata; | |
1890 | struct ieee80211_local *local = rx->local; | |
1891 | struct ieee80211_rtap_hdr { | |
1892 | struct ieee80211_radiotap_header hdr; | |
1893 | u8 flags; | |
1894 | u8 rate; | |
1895 | __le16 chan_freq; | |
1896 | __le16 chan_flags; | |
1897 | } __attribute__ ((packed)) *rthdr; | |
1898 | struct sk_buff *skb = rx->skb, *skb2; | |
1899 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1900 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1901 | |
5cf121c3 | 1902 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1903 | goto out_free_skb; |
1904 | ||
1905 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1906 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1907 | goto out_free_skb; | |
1908 | ||
1909 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1910 | memset(rthdr, 0, sizeof(*rthdr)); | |
1911 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1912 | rthdr->hdr.it_present = | |
1913 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1914 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1915 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1916 | ||
5cf121c3 | 1917 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1918 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1919 | ||
1920 | if (status->band == IEEE80211_BAND_5GHZ) | |
1921 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1922 | IEEE80211_CHAN_5GHZ); | |
1923 | else | |
1924 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1925 | IEEE80211_CHAN_2GHZ); | |
1926 | ||
1927 | skb_set_mac_header(skb, 0); | |
1928 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1929 | skb->pkt_type = PACKET_OTHERHOST; | |
1930 | skb->protocol = htons(ETH_P_802_2); | |
1931 | ||
1932 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1933 | if (!netif_running(sdata->dev)) | |
1934 | continue; | |
1935 | ||
05c914fe | 1936 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1937 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1938 | continue; | |
1939 | ||
1940 | if (prev_dev) { | |
1941 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1942 | if (skb2) { | |
1943 | skb2->dev = prev_dev; | |
1944 | netif_rx(skb2); | |
1945 | } | |
1946 | } | |
1947 | ||
1948 | prev_dev = sdata->dev; | |
1949 | sdata->dev->stats.rx_packets++; | |
1950 | sdata->dev->stats.rx_bytes += skb->len; | |
1951 | } | |
1952 | ||
1953 | if (prev_dev) { | |
1954 | skb->dev = prev_dev; | |
1955 | netif_rx(skb); | |
1956 | skb = NULL; | |
1957 | } else | |
1958 | goto out_free_skb; | |
1959 | ||
5cf121c3 | 1960 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1961 | return; |
1962 | ||
1963 | out_free_skb: | |
1964 | dev_kfree_skb(skb); | |
1965 | } | |
1966 | ||
571ecf67 | 1967 | |
8944b79f | 1968 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1969 | struct ieee80211_rx_data *rx, |
8944b79f | 1970 | struct sk_buff *skb) |
58905290 | 1971 | { |
58905290 JB |
1972 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1973 | ||
8944b79f JB |
1974 | rx->skb = skb; |
1975 | rx->sdata = sdata; | |
1976 | rx->dev = sdata->dev; | |
1977 | ||
e32f85f7 LCC |
1978 | #define CALL_RXH(rxh) \ |
1979 | do { \ | |
1980 | res = rxh(rx); \ | |
1981 | if (res != RX_CONTINUE) \ | |
1982 | goto rxh_done; \ | |
1983 | } while (0); | |
49461622 JB |
1984 | |
1985 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1986 | CALL_RXH(ieee80211_rx_h_check) | |
1987 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 1988 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
1989 | CALL_RXH(ieee80211_rx_h_sta_process) |
1990 | CALL_RXH(ieee80211_rx_h_defragment) | |
1991 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1992 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1993 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1994 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1995 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1996 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1997 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1998 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1999 | #endif |
49461622 JB |
2000 | CALL_RXH(ieee80211_rx_h_data) |
2001 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 2002 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
2003 | CALL_RXH(ieee80211_rx_h_mgmt) |
2004 | ||
2005 | #undef CALL_RXH | |
2006 | ||
2007 | rxh_done: | |
58905290 JB |
2008 | switch (res) { |
2009 | case RX_DROP_MONITOR: | |
49461622 JB |
2010 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2011 | if (rx->sta) | |
2012 | rx->sta->rx_dropped++; | |
2013 | /* fall through */ | |
2014 | case RX_CONTINUE: | |
3d30d949 MW |
2015 | ieee80211_rx_cooked_monitor(rx); |
2016 | break; | |
58905290 | 2017 | case RX_DROP_UNUSABLE: |
49461622 JB |
2018 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2019 | if (rx->sta) | |
2020 | rx->sta->rx_dropped++; | |
58905290 JB |
2021 | dev_kfree_skb(rx->skb); |
2022 | break; | |
49461622 JB |
2023 | case RX_QUEUED: |
2024 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2025 | break; | |
58905290 JB |
2026 | } |
2027 | } | |
2028 | ||
571ecf67 JB |
2029 | /* main receive path */ |
2030 | ||
23a24def | 2031 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2032 | struct ieee80211_rx_data *rx, |
23a24def JB |
2033 | struct ieee80211_hdr *hdr) |
2034 | { | |
7ab17c45 | 2035 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2036 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2037 | ||
51fb61e7 | 2038 | switch (sdata->vif.type) { |
05c914fe | 2039 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2040 | if (!bssid) |
2041 | return 0; | |
77fdaa12 JB |
2042 | if (!multicast && |
2043 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { | |
4150c572 | 2044 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2045 | return 0; |
5cf121c3 | 2046 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2047 | } |
2048 | break; | |
05c914fe | 2049 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2050 | if (!bssid) |
2051 | return 0; | |
a7767f95 | 2052 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2053 | return 1; |
87291c02 | 2054 | } |
46900298 | 2055 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2056 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2057 | return 0; |
5cf121c3 | 2058 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2059 | } else if (!multicast && |
2060 | compare_ether_addr(sdata->dev->dev_addr, | |
2061 | hdr->addr1) != 0) { | |
4150c572 | 2062 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2063 | return 0; |
5cf121c3 | 2064 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2065 | } else if (!rx->sta) { |
2066 | int rate_idx; | |
2067 | if (rx->status->flag & RX_FLAG_HT) | |
2068 | rate_idx = 0; /* TODO: HT rates */ | |
2069 | else | |
2070 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2071 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2072 | BIT(rate_idx)); |
2073 | } | |
23a24def | 2074 | break; |
05c914fe | 2075 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2076 | if (!multicast && |
2077 | compare_ether_addr(sdata->dev->dev_addr, | |
2078 | hdr->addr1) != 0) { | |
2079 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2080 | return 0; | |
2081 | ||
5cf121c3 | 2082 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2083 | } |
2084 | break; | |
05c914fe JB |
2085 | case NL80211_IFTYPE_AP_VLAN: |
2086 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2087 | if (!bssid) { |
2088 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2089 | hdr->addr1)) | |
2090 | return 0; | |
2091 | } else if (!ieee80211_bssid_match(bssid, | |
2092 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2093 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2094 | return 0; |
5cf121c3 | 2095 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2096 | } |
23a24def | 2097 | break; |
05c914fe | 2098 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2099 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2100 | return 0; |
2101 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2102 | return 0; | |
2103 | break; | |
05c914fe | 2104 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2105 | /* take everything */ |
2106 | break; | |
05c914fe JB |
2107 | case NL80211_IFTYPE_UNSPECIFIED: |
2108 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2109 | /* should never get here */ |
2110 | WARN_ON(1); | |
2111 | break; | |
23a24def JB |
2112 | } |
2113 | ||
2114 | return 1; | |
2115 | } | |
2116 | ||
571ecf67 | 2117 | /* |
6368e4b1 RR |
2118 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2119 | * be called with rcu_read_lock protection. | |
571ecf67 | 2120 | */ |
71ebb4aa RR |
2121 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2122 | struct sk_buff *skb, | |
8318d78a | 2123 | struct ieee80211_rate *rate) |
571ecf67 | 2124 | { |
f1d58c25 | 2125 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2126 | struct ieee80211_local *local = hw_to_local(hw); |
2127 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2128 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2129 | struct ieee80211_rx_data rx; |
6368e4b1 | 2130 | int prepares; |
8e6f0032 JB |
2131 | struct ieee80211_sub_if_data *prev = NULL; |
2132 | struct sk_buff *skb_new; | |
571ecf67 | 2133 | |
358c8d9d | 2134 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2135 | memset(&rx, 0, sizeof(rx)); |
2136 | rx.skb = skb; | |
2137 | rx.local = local; | |
2138 | ||
5cf121c3 | 2139 | rx.status = status; |
5cf121c3 | 2140 | rx.rate = rate; |
72abd81b | 2141 | |
358c8d9d | 2142 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2143 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2144 | |
8944b79f JB |
2145 | rx.sta = sta_info_get(local, hdr->addr2); |
2146 | if (rx.sta) { | |
d0709a65 JB |
2147 | rx.sdata = rx.sta->sdata; |
2148 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2149 | } |
571ecf67 | 2150 | |
571ecf67 | 2151 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
3b8d81e0 | 2152 | ieee80211_rx_michael_mic_report(hdr, &rx); |
d0709a65 | 2153 | return; |
571ecf67 JB |
2154 | } |
2155 | ||
142b9f50 HS |
2156 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2157 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2158 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2159 | |
38f3714d | 2160 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2161 | ieee80211_verify_alignment(&rx); |
38f3714d | 2162 | |
571ecf67 JB |
2163 | skb = rx.skb; |
2164 | ||
fbc44bf7 JB |
2165 | if (rx.sdata && ieee80211_is_data(hdr->frame_control)) { |
2166 | rx.flags |= IEEE80211_RX_RA_MATCH; | |
2167 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); | |
2168 | if (prepares) | |
2169 | prev = rx.sdata; | |
2170 | } else list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
2a8a9a88 JB |
2171 | if (!netif_running(sdata->dev)) |
2172 | continue; | |
2173 | ||
fbc44bf7 JB |
2174 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
2175 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b2e7771e JB |
2176 | continue; |
2177 | ||
5cf121c3 | 2178 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2179 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2180 | |
6368e4b1 | 2181 | if (!prepares) |
23a24def | 2182 | continue; |
8e6f0032 | 2183 | |
340e11f3 JB |
2184 | /* |
2185 | * frame is destined for this interface, but if it's not | |
2186 | * also for the previous one we handle that after the | |
2187 | * loop to avoid copying the SKB once too much | |
2188 | */ | |
2189 | ||
2190 | if (!prev) { | |
2191 | prev = sdata; | |
2192 | continue; | |
8e6f0032 | 2193 | } |
340e11f3 JB |
2194 | |
2195 | /* | |
2196 | * frame was destined for the previous interface | |
2197 | * so invoke RX handlers for it | |
2198 | */ | |
2199 | ||
2200 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2201 | if (!skb_new) { | |
2202 | if (net_ratelimit()) | |
2203 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2204 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2205 | wiphy_name(local->hw.wiphy), |
2206 | prev->dev->name); | |
340e11f3 JB |
2207 | continue; |
2208 | } | |
8944b79f | 2209 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2210 | prev = sdata; |
571ecf67 | 2211 | } |
a4b7d7bd | 2212 | if (prev) |
8944b79f | 2213 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2214 | else |
8e6f0032 | 2215 | dev_kfree_skb(skb); |
571ecf67 | 2216 | } |
6368e4b1 | 2217 | |
b580781e RR |
2218 | #define SEQ_MODULO 0x1000 |
2219 | #define SEQ_MASK 0xfff | |
2220 | ||
2221 | static inline int seq_less(u16 sq1, u16 sq2) | |
2222 | { | |
c6a1fa12 | 2223 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2224 | } |
2225 | ||
2226 | static inline u16 seq_inc(u16 sq) | |
2227 | { | |
c6a1fa12 | 2228 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2229 | } |
2230 | ||
2231 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2232 | { | |
c6a1fa12 | 2233 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2234 | } |
2235 | ||
2236 | ||
2d3babd1 JM |
2237 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
2238 | struct tid_ampdu_rx *tid_agg_rx, | |
2239 | int index) | |
2240 | { | |
2241 | struct ieee80211_supported_band *sband; | |
2242 | struct ieee80211_rate *rate; | |
f1d58c25 JB |
2243 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
2244 | struct ieee80211_rx_status *status; | |
2d3babd1 | 2245 | |
f1d58c25 | 2246 | if (!skb) |
2d3babd1 JM |
2247 | goto no_frame; |
2248 | ||
f1d58c25 JB |
2249 | status = IEEE80211_SKB_RXCB(skb); |
2250 | ||
2d3babd1 | 2251 | /* release the reordered frames to stack */ |
f1d58c25 JB |
2252 | sband = hw->wiphy->bands[status->band]; |
2253 | if (status->flag & RX_FLAG_HT) | |
2d3babd1 JM |
2254 | rate = sband->bitrates; /* TODO: HT rates */ |
2255 | else | |
f1d58c25 JB |
2256 | rate = &sband->bitrates[status->rate_idx]; |
2257 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
2d3babd1 JM |
2258 | tid_agg_rx->stored_mpdu_num--; |
2259 | tid_agg_rx->reorder_buf[index] = NULL; | |
2260 | ||
2261 | no_frame: | |
2262 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2263 | } | |
2264 | ||
2265 | ||
4d050f1d JM |
2266 | /* |
2267 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
2268 | * the skb was added to the buffer longer than this time ago, the earlier | |
2269 | * frames that have not yet been received are assumed to be lost and the skb | |
2270 | * can be released for processing. This may also release other skb's from the | |
2271 | * reorder buffer if there are no additional gaps between the frames. | |
2272 | */ | |
2273 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
2274 | ||
71364716 RR |
2275 | /* |
2276 | * As it function blongs to Rx path it must be called with | |
2277 | * the proper rcu_read_lock protection for its flow. | |
2278 | */ | |
c6a1fa12 JB |
2279 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2280 | struct tid_ampdu_rx *tid_agg_rx, | |
2281 | struct sk_buff *skb, | |
2282 | u16 mpdu_seq_num, | |
2283 | int bar_req) | |
b580781e | 2284 | { |
b580781e RR |
2285 | u16 head_seq_num, buf_size; |
2286 | int index; | |
b580781e RR |
2287 | |
2288 | buf_size = tid_agg_rx->buf_size; | |
2289 | head_seq_num = tid_agg_rx->head_seq_num; | |
2290 | ||
2291 | /* frame with out of date sequence number */ | |
2292 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2293 | dev_kfree_skb(skb); | |
2294 | return 1; | |
2295 | } | |
2296 | ||
2297 | /* if frame sequence number exceeds our buffering window size or | |
2298 | * block Ack Request arrived - release stored frames */ | |
2299 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2300 | /* new head to the ordering buffer */ | |
2301 | if (bar_req) | |
2302 | head_seq_num = mpdu_seq_num; | |
2303 | else | |
2304 | head_seq_num = | |
2305 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2306 | /* release stored frames up to new head to stack */ | |
2307 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2308 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2309 | tid_agg_rx->ssn) | |
2310 | % tid_agg_rx->buf_size; | |
2d3babd1 JM |
2311 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
2312 | index); | |
b580781e RR |
2313 | } |
2314 | if (bar_req) | |
2315 | return 1; | |
2316 | } | |
2317 | ||
2318 | /* now the new frame is always in the range of the reordering */ | |
2319 | /* buffer window */ | |
2320 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2321 | % tid_agg_rx->buf_size; | |
2322 | /* check if we already stored this frame */ | |
2323 | if (tid_agg_rx->reorder_buf[index]) { | |
2324 | dev_kfree_skb(skb); | |
2325 | return 1; | |
2326 | } | |
2327 | ||
2328 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2329 | /* release it immediately */ | |
2330 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2331 | tid_agg_rx->stored_mpdu_num == 0) { | |
2332 | tid_agg_rx->head_seq_num = | |
2333 | seq_inc(tid_agg_rx->head_seq_num); | |
2334 | return 0; | |
2335 | } | |
2336 | ||
2337 | /* put the frame in the reordering buffer */ | |
2338 | tid_agg_rx->reorder_buf[index] = skb; | |
4d050f1d | 2339 | tid_agg_rx->reorder_time[index] = jiffies; |
b580781e RR |
2340 | tid_agg_rx->stored_mpdu_num++; |
2341 | /* release the buffer until next missing frame */ | |
2342 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2343 | % tid_agg_rx->buf_size; | |
4d050f1d JM |
2344 | if (!tid_agg_rx->reorder_buf[index] && |
2345 | tid_agg_rx->stored_mpdu_num > 1) { | |
2346 | /* | |
2347 | * No buffers ready to be released, but check whether any | |
2348 | * frames in the reorder buffer have timed out. | |
2349 | */ | |
2350 | int j; | |
2351 | int skipped = 1; | |
2352 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
2353 | j = (j + 1) % tid_agg_rx->buf_size) { | |
2354 | if (tid_agg_rx->reorder_buf[j] == NULL) { | |
2355 | skipped++; | |
2356 | continue; | |
2357 | } | |
2358 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
2359 | HZ / 10)) | |
2360 | break; | |
2361 | ||
2362 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
2363 | if (net_ratelimit()) | |
2364 | printk(KERN_DEBUG "%s: release an RX reorder " | |
2365 | "frame due to timeout on earlier " | |
2366 | "frames\n", | |
2367 | wiphy_name(hw->wiphy)); | |
2368 | #endif | |
2369 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); | |
2370 | ||
2371 | /* | |
2372 | * Increment the head seq# also for the skipped slots. | |
2373 | */ | |
2374 | tid_agg_rx->head_seq_num = | |
2375 | (tid_agg_rx->head_seq_num + skipped) & | |
2376 | SEQ_MASK; | |
2377 | skipped = 0; | |
2378 | } | |
2379 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2d3babd1 | 2380 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
b580781e RR |
2381 | index = seq_sub(tid_agg_rx->head_seq_num, |
2382 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2383 | } | |
2384 | return 1; | |
2385 | } | |
2386 | ||
71ebb4aa | 2387 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
f1d58c25 | 2388 | struct sk_buff *skb) |
b580781e RR |
2389 | { |
2390 | struct ieee80211_hw *hw = &local->hw; | |
2391 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2392 | struct sta_info *sta; | |
2393 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2394 | u16 sc; |
b580781e | 2395 | u16 mpdu_seq_num; |
182503ab | 2396 | u8 ret = 0; |
b580781e RR |
2397 | int tid; |
2398 | ||
2399 | sta = sta_info_get(local, hdr->addr2); | |
2400 | if (!sta) | |
2401 | return ret; | |
2402 | ||
b580781e RR |
2403 | /* filter the QoS data rx stream according to |
2404 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2405 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2406 | goto end_reorder; |
2407 | ||
238f74a2 | 2408 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2409 | |
cee24a3e | 2410 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2411 | goto end_reorder; |
2412 | ||
cee24a3e RR |
2413 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2414 | ||
2560b6e2 EG |
2415 | /* qos null data frames are excluded */ |
2416 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2417 | goto end_reorder; |
2418 | ||
2419 | /* new un-ordered ampdu frame - process it */ | |
2420 | ||
2421 | /* reset session timer */ | |
20ad19d0 JB |
2422 | if (tid_agg_rx->timeout) |
2423 | mod_timer(&tid_agg_rx->session_timer, | |
2424 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2425 | |
2426 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2427 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2428 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2429 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2430 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2431 | ret = 1; | |
2432 | goto end_reorder; | |
2433 | } | |
2434 | ||
2435 | /* according to mpdu sequence number deal with reordering buffer */ | |
2436 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
f1d58c25 | 2437 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, |
b580781e | 2438 | mpdu_seq_num, 0); |
d0709a65 | 2439 | end_reorder: |
b580781e RR |
2440 | return ret; |
2441 | } | |
2442 | ||
6368e4b1 RR |
2443 | /* |
2444 | * This is the receive path handler. It is called by a low level driver when an | |
2445 | * 802.11 MPDU is received from the hardware. | |
2446 | */ | |
103bf9f7 | 2447 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2448 | { |
2449 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2450 | struct ieee80211_rate *rate = NULL; |
2451 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2452 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a | 2453 | |
d20ef63d JB |
2454 | WARN_ON_ONCE(softirq_count() == 0); |
2455 | ||
77a980dc JB |
2456 | if (WARN_ON(status->band < 0 || |
2457 | status->band >= IEEE80211_NUM_BANDS)) | |
2458 | goto drop; | |
8318d78a JB |
2459 | |
2460 | sband = local->hw.wiphy->bands[status->band]; | |
77a980dc JB |
2461 | if (WARN_ON(!sband)) |
2462 | goto drop; | |
8318d78a | 2463 | |
89c3a8ac JB |
2464 | /* |
2465 | * If we're suspending, it is possible although not too likely | |
2466 | * that we'd be receiving frames after having already partially | |
2467 | * quiesced the stack. We can't process such frames then since | |
2468 | * that might, for example, cause stations to be added or other | |
2469 | * driver callbacks be invoked. | |
2470 | */ | |
77a980dc JB |
2471 | if (unlikely(local->quiescing || local->suspended)) |
2472 | goto drop; | |
89c3a8ac | 2473 | |
ea77f12f JB |
2474 | /* |
2475 | * The same happens when we're not even started, | |
2476 | * but that's worth a warning. | |
2477 | */ | |
77a980dc JB |
2478 | if (WARN_ON(!local->started)) |
2479 | goto drop; | |
ea77f12f | 2480 | |
0fb8ca45 JM |
2481 | if (status->flag & RX_FLAG_HT) { |
2482 | /* rate_idx is MCS index */ | |
2483 | if (WARN_ON(status->rate_idx < 0 || | |
2484 | status->rate_idx >= 76)) | |
77a980dc | 2485 | goto drop; |
0fb8ca45 JM |
2486 | /* HT rates are not in the table - use the highest legacy rate |
2487 | * for now since other parts of mac80211 may not yet be fully | |
2488 | * MCS aware. */ | |
2489 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2490 | } else { | |
2491 | if (WARN_ON(status->rate_idx < 0 || | |
2492 | status->rate_idx >= sband->n_bitrates)) | |
77a980dc | 2493 | goto drop; |
0fb8ca45 JM |
2494 | rate = &sband->bitrates[status->rate_idx]; |
2495 | } | |
6368e4b1 RR |
2496 | |
2497 | /* | |
2498 | * key references and virtual interfaces are protected using RCU | |
2499 | * and this requires that we are in a read-side RCU section during | |
2500 | * receive processing | |
2501 | */ | |
2502 | rcu_read_lock(); | |
2503 | ||
2504 | /* | |
2505 | * Frames with failed FCS/PLCP checksum are not returned, | |
2506 | * all other frames are returned without radiotap header | |
2507 | * if it was previously present. | |
2508 | * Also, frames with less than 16 bytes are dropped. | |
2509 | */ | |
f1d58c25 | 2510 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2511 | if (!skb) { |
2512 | rcu_read_unlock(); | |
2513 | return; | |
2514 | } | |
2515 | ||
aec67952 JM |
2516 | /* |
2517 | * In theory, the block ack reordering should happen after duplicate | |
2518 | * removal (ieee80211_rx_h_check(), which is an RX handler). As such, | |
2519 | * the call to ieee80211_rx_reorder_ampdu() should really be moved to | |
2520 | * happen as a new RX handler between ieee80211_rx_h_check and | |
2521 | * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for | |
2522 | * the time being, the call can be here since RX reorder buf processing | |
2523 | * will implicitly skip duplicates. We could, in theory at least, | |
2524 | * process frames that ieee80211_rx_h_passive_scan would drop (e.g., | |
2525 | * frames from other than operational channel), but that should not | |
2526 | * happen in normal networks. | |
2527 | */ | |
f1d58c25 JB |
2528 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
2529 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
6368e4b1 RR |
2530 | |
2531 | rcu_read_unlock(); | |
77a980dc JB |
2532 | |
2533 | return; | |
2534 | drop: | |
2535 | kfree_skb(skb); | |
6368e4b1 | 2536 | } |
103bf9f7 | 2537 | EXPORT_SYMBOL(ieee80211_rx); |
571ecf67 JB |
2538 | |
2539 | /* This is a version of the rx handler that can be called from hard irq | |
2540 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2541 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2542 | { |
2543 | struct ieee80211_local *local = hw_to_local(hw); | |
2544 | ||
2545 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2546 | ||
571ecf67 JB |
2547 | skb->pkt_type = IEEE80211_RX_MSG; |
2548 | skb_queue_tail(&local->skb_queue, skb); | |
2549 | tasklet_schedule(&local->tasklet); | |
2550 | } | |
2551 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |