Commit | Line | Data |
---|---|---|
571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
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, | |
42 | struct sk_buff *skb, | |
43 | int rtap_len) | |
44 | { | |
45 | skb_pull(skb, rtap_len); | |
46 | ||
47 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
48 | if (likely(skb->len > FCS_LEN)) | |
49 | skb_trim(skb, skb->len - FCS_LEN); | |
50 | else { | |
51 | /* driver bug */ | |
52 | WARN_ON(1); | |
53 | dev_kfree_skb(skb); | |
54 | skb = NULL; | |
55 | } | |
56 | } | |
57 | ||
58 | return skb; | |
59 | } | |
60 | ||
f1d58c25 | 61 | static inline int should_drop_frame(struct sk_buff *skb, |
b2e7771e JB |
62 | int present_fcs_len, |
63 | int radiotap_len) | |
64 | { | |
f1d58c25 | 65 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
182503ab | 66 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
67 | |
68 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
69 | return 1; | |
70 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
71 | return 1; | |
87228f57 HH |
72 | if (ieee80211_is_ctl(hdr->frame_control) && |
73 | !ieee80211_is_pspoll(hdr->frame_control) && | |
74 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
75 | return 1; |
76 | return 0; | |
77 | } | |
78 | ||
601ae7f2 BR |
79 | static int |
80 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
81 | struct ieee80211_rx_status *status) | |
82 | { | |
83 | int len; | |
84 | ||
85 | /* always present fields */ | |
86 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
87 | ||
88 | if (status->flag & RX_FLAG_TSFT) | |
89 | len += 8; | |
7fee5372 | 90 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
91 | len += 1; |
92 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
93 | len += 1; | |
94 | ||
95 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
96 | len++; | |
97 | ||
98 | /* make sure radiotap starts at a naturally aligned address */ | |
99 | if (len % 8) | |
100 | len = roundup(len, 8); | |
101 | ||
102 | return len; | |
103 | } | |
104 | ||
d1c3a37c | 105 | /* |
601ae7f2 BR |
106 | * ieee80211_add_rx_radiotap_header - add radiotap header |
107 | * | |
108 | * add a radiotap header containing all the fields which the hardware provided. | |
109 | */ | |
110 | static void | |
111 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
112 | struct sk_buff *skb, | |
601ae7f2 BR |
113 | struct ieee80211_rate *rate, |
114 | int rtap_len) | |
115 | { | |
f1d58c25 | 116 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
601ae7f2 BR |
117 | struct ieee80211_radiotap_header *rthdr; |
118 | unsigned char *pos; | |
119 | ||
120 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
121 | memset(rthdr, 0, rtap_len); | |
122 | ||
123 | /* radiotap header, set always present flags */ | |
124 | rthdr->it_present = | |
125 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
126 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
127 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
128 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
129 | rthdr->it_len = cpu_to_le16(rtap_len); | |
130 | ||
131 | pos = (unsigned char *)(rthdr+1); | |
132 | ||
133 | /* the order of the following fields is important */ | |
134 | ||
135 | /* IEEE80211_RADIOTAP_TSFT */ | |
136 | if (status->flag & RX_FLAG_TSFT) { | |
137 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
138 | rthdr->it_present |= | |
139 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
140 | pos += 8; | |
141 | } | |
142 | ||
143 | /* IEEE80211_RADIOTAP_FLAGS */ | |
144 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
145 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
146 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
147 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
148 | if (status->flag & RX_FLAG_SHORTPRE) |
149 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
150 | pos++; |
151 | ||
152 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
153 | if (status->flag & RX_FLAG_HT) { |
154 | /* | |
155 | * TODO: add following information into radiotap header once | |
156 | * suitable fields are defined for it: | |
157 | * - MCS index (status->rate_idx) | |
158 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
159 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
160 | */ | |
161 | *pos = 0; | |
8d6f658e | 162 | } else { |
ebe6c7ba | 163 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 164 | *pos = rate->bitrate / 5; |
8d6f658e | 165 | } |
601ae7f2 BR |
166 | pos++; |
167 | ||
168 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
169 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
170 | pos += 2; | |
171 | if (status->band == IEEE80211_BAND_5GHZ) | |
172 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
173 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
174 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
175 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
176 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 177 | else |
9deb1ae5 | 178 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
179 | IEEE80211_CHAN_2GHZ); |
180 | pos += 2; | |
181 | ||
182 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
183 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
184 | *pos = status->signal; | |
185 | rthdr->it_present |= | |
186 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
187 | pos++; | |
188 | } | |
189 | ||
190 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
191 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
192 | *pos = status->noise; | |
193 | rthdr->it_present |= | |
194 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
195 | pos++; | |
196 | } | |
197 | ||
198 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
199 | ||
200 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
201 | *pos = status->antenna; | |
202 | pos++; | |
203 | ||
601ae7f2 BR |
204 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
205 | ||
206 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
207 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
208 | if ((pos - (unsigned char *)rthdr) & 1) | |
209 | pos++; | |
aae89831 JB |
210 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
211 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP); | |
601ae7f2 BR |
212 | pos += 2; |
213 | } | |
214 | ||
b2e7771e JB |
215 | /* |
216 | * This function copies a received frame to all monitor interfaces and | |
217 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
218 | * radiotap header the driver might have added. | |
219 | */ | |
220 | static struct sk_buff * | |
221 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a | 222 | struct ieee80211_rate *rate) |
b2e7771e | 223 | { |
f1d58c25 | 224 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
b2e7771e | 225 | struct ieee80211_sub_if_data *sdata; |
b2e7771e | 226 | int needed_headroom = 0; |
b2e7771e JB |
227 | struct sk_buff *skb, *skb2; |
228 | struct net_device *prev_dev = NULL; | |
229 | int present_fcs_len = 0; | |
230 | int rtap_len = 0; | |
231 | ||
232 | /* | |
233 | * First, we may need to make a copy of the skb because | |
234 | * (1) we need to modify it for radiotap (if not present), and | |
235 | * (2) the other RX handlers will modify the skb we got. | |
236 | * | |
237 | * We don't need to, of course, if we aren't going to return | |
238 | * the SKB because it has a bad FCS/PLCP checksum. | |
239 | */ | |
240 | if (status->flag & RX_FLAG_RADIOTAP) | |
241 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
242 | else | |
601ae7f2 BR |
243 | /* room for the radiotap header based on driver features */ |
244 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
245 | |
246 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
247 | present_fcs_len = FCS_LEN; | |
248 | ||
249 | if (!local->monitors) { | |
f1d58c25 | 250 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
b2e7771e JB |
251 | dev_kfree_skb(origskb); |
252 | return NULL; | |
253 | } | |
254 | ||
255 | return remove_monitor_info(local, origskb, rtap_len); | |
256 | } | |
257 | ||
f1d58c25 | 258 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
b2e7771e JB |
259 | /* only need to expand headroom if necessary */ |
260 | skb = origskb; | |
261 | origskb = NULL; | |
262 | ||
263 | /* | |
264 | * This shouldn't trigger often because most devices have an | |
265 | * RX header they pull before we get here, and that should | |
266 | * be big enough for our radiotap information. We should | |
267 | * probably export the length to drivers so that we can have | |
268 | * them allocate enough headroom to start with. | |
269 | */ | |
270 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 271 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
272 | dev_kfree_skb(skb); |
273 | return NULL; | |
274 | } | |
275 | } else { | |
276 | /* | |
277 | * Need to make a copy and possibly remove radiotap header | |
278 | * and FCS from the original. | |
279 | */ | |
280 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
281 | ||
282 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
283 | ||
284 | if (!skb) | |
285 | return origskb; | |
286 | } | |
287 | ||
288 | /* if necessary, prepend radiotap information */ | |
601ae7f2 | 289 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
f1d58c25 | 290 | ieee80211_add_rx_radiotap_header(local, skb, rate, |
601ae7f2 | 291 | needed_headroom); |
b2e7771e | 292 | |
ce3edf6d | 293 | skb_reset_mac_header(skb); |
b2e7771e JB |
294 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
295 | skb->pkt_type = PACKET_OTHERHOST; | |
296 | skb->protocol = htons(ETH_P_802_2); | |
297 | ||
298 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
299 | if (!netif_running(sdata->dev)) | |
300 | continue; | |
301 | ||
05c914fe | 302 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
303 | continue; |
304 | ||
3d30d949 MW |
305 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
306 | continue; | |
307 | ||
b2e7771e JB |
308 | if (prev_dev) { |
309 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
310 | if (skb2) { | |
311 | skb2->dev = prev_dev; | |
312 | netif_rx(skb2); | |
313 | } | |
314 | } | |
315 | ||
316 | prev_dev = sdata->dev; | |
317 | sdata->dev->stats.rx_packets++; | |
318 | sdata->dev->stats.rx_bytes += skb->len; | |
319 | } | |
320 | ||
321 | if (prev_dev) { | |
322 | skb->dev = prev_dev; | |
323 | netif_rx(skb); | |
324 | } else | |
325 | dev_kfree_skb(skb); | |
326 | ||
327 | return origskb; | |
328 | } | |
329 | ||
330 | ||
5cf121c3 | 331 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 332 | { |
238f74a2 | 333 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
334 | int tid; |
335 | ||
336 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
337 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
338 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 339 | /* frame has qos control */ |
238f74a2 HH |
340 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
341 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 342 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 343 | else |
5cf121c3 | 344 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 345 | } else { |
1411f9b5 JB |
346 | /* |
347 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
348 | * | |
349 | * Sequence numbers for management frames, QoS data | |
350 | * frames with a broadcast/multicast address in the | |
351 | * Address 1 field, and all non-QoS data frames sent | |
352 | * by QoS STAs are assigned using an additional single | |
353 | * modulo-4096 counter, [...] | |
354 | * | |
355 | * We also use that counter for non-QoS STAs. | |
356 | */ | |
357 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 358 | } |
52865dfd | 359 | |
5cf121c3 | 360 | rx->queue = tid; |
6e0d114d JB |
361 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
362 | * For now, set skb->priority to 0 for other cases. */ | |
363 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 364 | } |
6e0d114d | 365 | |
d1c3a37c JB |
366 | /** |
367 | * DOC: Packet alignment | |
368 | * | |
369 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
370 | * to the stack. | |
371 | * | |
372 | * Additionally, should, if possible, align the payload data in a way that | |
373 | * guarantees that the contained IP header is aligned to a four-byte | |
374 | * boundary. In the case of regular frames, this simply means aligning the | |
375 | * payload to a four-byte boundary (because either the IP header is directly | |
376 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
377 | * in front of it). | |
378 | * | |
379 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
380 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
381 | * push the IP header further back to a multiple of four again. Thankfully, the | |
382 | * specs were sane enough this time around to require padding each A-MSDU | |
383 | * subframe to a length that is a multiple of four. | |
384 | * | |
385 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
386 | * the payload is not supported, the driver is required to move the 802.11 | |
387 | * header to be directly in front of the payload in that case. | |
388 | */ | |
389 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 390 | { |
a7767f95 | 391 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
392 | int hdrlen; |
393 | ||
d1c3a37c JB |
394 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
395 | return; | |
396 | #endif | |
397 | ||
398 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
399 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
400 | return; | |
401 | ||
a7767f95 | 402 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
403 | return; |
404 | ||
a7767f95 | 405 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 406 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 407 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
408 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
409 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
410 | } |
411 | ||
6368e4b1 | 412 | |
571ecf67 JB |
413 | /* rx handlers */ |
414 | ||
49461622 | 415 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 416 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
417 | { |
418 | struct ieee80211_local *local = rx->local; | |
419 | struct sk_buff *skb = rx->skb; | |
420 | ||
fbe9c429 | 421 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
f1d58c25 | 422 | return ieee80211_scan_rx(rx->sdata, skb); |
ece8eddd | 423 | |
142b9f50 HS |
424 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
425 | (rx->flags & IEEE80211_RX_IN_SCAN))) { | |
ece8eddd | 426 | /* drop all the other packets during a software scan anyway */ |
f1d58c25 | 427 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
ece8eddd | 428 | dev_kfree_skb(skb); |
9ae54c84 | 429 | return RX_QUEUED; |
571ecf67 JB |
430 | } |
431 | ||
5cf121c3 | 432 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
433 | /* scanning finished during invoking of handlers */ |
434 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 435 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
436 | } |
437 | ||
9ae54c84 | 438 | return RX_CONTINUE; |
571ecf67 JB |
439 | } |
440 | ||
3cfcf6ac JM |
441 | |
442 | static int ieee80211_is_unicast_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 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
454 | { | |
455 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
456 | ||
457 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
458 | return 0; | |
459 | ||
460 | return ieee80211_is_robust_mgmt_frame(hdr); | |
461 | } | |
462 | ||
463 | ||
464 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
465 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
466 | { | |
467 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
468 | struct ieee80211_mmie *mmie; | |
469 | ||
470 | if (skb->len < 24 + sizeof(*mmie) || | |
471 | !is_multicast_ether_addr(hdr->da)) | |
472 | return -1; | |
473 | ||
474 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
475 | return -1; /* not a robust management frame */ | |
476 | ||
477 | mmie = (struct ieee80211_mmie *) | |
478 | (skb->data + skb->len - sizeof(*mmie)); | |
479 | if (mmie->element_id != WLAN_EID_MMIE || | |
480 | mmie->length != sizeof(*mmie) - 2) | |
481 | return -1; | |
482 | ||
483 | return le16_to_cpu(mmie->key_id); | |
484 | } | |
485 | ||
486 | ||
33b64eb2 | 487 | static ieee80211_rx_result |
5cf121c3 | 488 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 489 | { |
a7767f95 HH |
490 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
491 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 492 | |
a7767f95 HH |
493 | if (ieee80211_is_data(hdr->frame_control)) { |
494 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
495 | return RX_DROP_MONITOR; |
496 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
497 | return RX_DROP_MONITOR; | |
498 | } | |
499 | ||
500 | /* If there is not an established peer link and this is not a peer link | |
501 | * establisment frame, beacon or probe, drop the frame. | |
502 | */ | |
503 | ||
b4e08ea1 | 504 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 505 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 506 | |
a7767f95 | 507 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
508 | return RX_DROP_MONITOR; |
509 | ||
a7767f95 | 510 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
511 | mgmt = (struct ieee80211_mgmt *)hdr; |
512 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
513 | return RX_DROP_MONITOR; | |
33b64eb2 | 514 | return RX_CONTINUE; |
33b64eb2 LCC |
515 | } |
516 | ||
a7767f95 HH |
517 | if (ieee80211_is_probe_req(hdr->frame_control) || |
518 | ieee80211_is_probe_resp(hdr->frame_control) || | |
519 | ieee80211_is_beacon(hdr->frame_control)) | |
520 | return RX_CONTINUE; | |
521 | ||
522 | return RX_DROP_MONITOR; | |
523 | ||
524 | } | |
525 | ||
526 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
527 | ||
528 | if (ieee80211_is_data(hdr->frame_control) && | |
529 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 530 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 531 | return RX_DROP_MONITOR; |
902acc78 | 532 | #undef msh_h_get |
d6d1a5a7 | 533 | |
902acc78 JB |
534 | return RX_CONTINUE; |
535 | } | |
33b64eb2 LCC |
536 | |
537 | ||
49461622 | 538 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 539 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 540 | { |
a7767f95 | 541 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
542 | |
543 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
544 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 545 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 546 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 547 | hdr->seq_ctrl)) { |
5cf121c3 | 548 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
549 | rx->local->dot11FrameDuplicateCount++; |
550 | rx->sta->num_duplicates++; | |
551 | } | |
e4c26add | 552 | return RX_DROP_MONITOR; |
571ecf67 | 553 | } else |
5cf121c3 | 554 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
555 | } |
556 | ||
571ecf67 JB |
557 | if (unlikely(rx->skb->len < 16)) { |
558 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 559 | return RX_DROP_MONITOR; |
571ecf67 JB |
560 | } |
561 | ||
571ecf67 JB |
562 | /* Drop disallowed frame classes based on STA auth/assoc state; |
563 | * IEEE 802.11, Chap 5.5. | |
564 | * | |
ccd7b362 JB |
565 | * mac80211 filters only based on association state, i.e. it drops |
566 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
567 | * deauth/disassoc frames when needed. In addition, hostapd is |
568 | * responsible for filtering on both auth and assoc states. | |
569 | */ | |
33b64eb2 | 570 | |
902acc78 | 571 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 572 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 573 | |
a7767f95 HH |
574 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
575 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 576 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 577 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
578 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
579 | !ieee80211_has_tods(hdr->frame_control) && | |
580 | ieee80211_is_data(hdr->frame_control)) || | |
581 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
582 | /* Drop IBSS frames and frames for other hosts |
583 | * silently. */ | |
e4c26add | 584 | return RX_DROP_MONITOR; |
571ecf67 JB |
585 | } |
586 | ||
e4c26add | 587 | return RX_DROP_MONITOR; |
571ecf67 JB |
588 | } |
589 | ||
9ae54c84 | 590 | return RX_CONTINUE; |
570bd537 JB |
591 | } |
592 | ||
593 | ||
49461622 | 594 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 595 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 596 | { |
a7767f95 | 597 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
598 | int keyidx; |
599 | int hdrlen; | |
e4c26add | 600 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 601 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 602 | int mmie_keyidx = -1; |
570bd537 | 603 | |
3017b80b JB |
604 | /* |
605 | * Key selection 101 | |
606 | * | |
3cfcf6ac | 607 | * There are four types of keys: |
3017b80b | 608 | * - GTK (group keys) |
3cfcf6ac | 609 | * - IGTK (group keys for management frames) |
3017b80b JB |
610 | * - PTK (pairwise keys) |
611 | * - STK (station-to-station pairwise keys) | |
612 | * | |
613 | * When selecting a key, we have to distinguish between multicast | |
614 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
615 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
616 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
617 | * unicast frames can also use key indices like GTKs. Hence, if we | |
618 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 619 | * |
8dc06a1c JB |
620 | * Note that in a regular BSS, multicast frames are sent by the |
621 | * AP only, associated stations unicast the frame to the AP first | |
622 | * which then multicasts it on their behalf. | |
623 | * | |
3017b80b JB |
624 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
625 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
626 | * The spec seems to expect that one negotiates the same key with |
627 | * every station but there's no such requirement; VLANs could be | |
628 | * possible. | |
3017b80b JB |
629 | */ |
630 | ||
3017b80b | 631 | /* |
1990af8d | 632 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
633 | * addressed to us nor a multicast frame. |
634 | */ | |
5cf121c3 | 635 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 636 | return RX_CONTINUE; |
3017b80b | 637 | |
d4e46a3d JB |
638 | if (rx->sta) |
639 | stakey = rcu_dereference(rx->sta->key); | |
640 | ||
0c7c10c7 JM |
641 | if (!ieee80211_has_protected(hdr->frame_control)) |
642 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
643 | ||
d4e46a3d JB |
644 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
645 | rx->key = stakey; | |
0c7c10c7 JM |
646 | /* Skip decryption if the frame is not protected. */ |
647 | if (!ieee80211_has_protected(hdr->frame_control)) | |
648 | return RX_CONTINUE; | |
3cfcf6ac JM |
649 | } else if (mmie_keyidx >= 0) { |
650 | /* Broadcast/multicast robust management frame / BIP */ | |
651 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && | |
652 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
653 | return RX_CONTINUE; | |
654 | ||
655 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
656 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
657 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
658 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
0c7c10c7 JM |
659 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
660 | /* | |
661 | * The frame was not protected, so skip decryption. However, we | |
662 | * need to set rx->key if there is a key that could have been | |
663 | * used so that the frame may be dropped if encryption would | |
664 | * have been expected. | |
665 | */ | |
666 | struct ieee80211_key *key = NULL; | |
667 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
668 | is_multicast_ether_addr(hdr->addr1) && | |
669 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
670 | rx->key = key; | |
671 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
672 | rx->key = key; | |
673 | return RX_CONTINUE; | |
571ecf67 | 674 | } else { |
3017b80b JB |
675 | /* |
676 | * The device doesn't give us the IV so we won't be | |
677 | * able to look up the key. That's ok though, we | |
678 | * don't need to decrypt the frame, we just won't | |
679 | * be able to keep statistics accurate. | |
680 | * Except for key threshold notifications, should | |
681 | * we somehow allow the driver to tell us which key | |
682 | * the hardware used if this flag is set? | |
683 | */ | |
5cf121c3 JB |
684 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
685 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 686 | return RX_CONTINUE; |
3017b80b | 687 | |
a7767f95 | 688 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
689 | |
690 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 691 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
692 | |
693 | /* | |
694 | * no need to call ieee80211_wep_get_keyidx, | |
695 | * it verifies a bunch of things we've done already | |
696 | */ | |
697 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
698 | ||
d4e46a3d | 699 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
700 | |
701 | /* | |
702 | * RSNA-protected unicast frames should always be sent with | |
703 | * pairwise or station-to-station keys, but for WEP we allow | |
704 | * using a key index as well. | |
705 | */ | |
8f20fc24 | 706 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
707 | !is_multicast_ether_addr(hdr->addr1)) |
708 | rx->key = NULL; | |
571ecf67 JB |
709 | } |
710 | ||
3017b80b | 711 | if (rx->key) { |
571ecf67 | 712 | rx->key->tx_rx_count++; |
011bfcc4 | 713 | /* TODO: add threshold stuff again */ |
1990af8d | 714 | } else { |
e4c26add | 715 | return RX_DROP_MONITOR; |
70f08765 JB |
716 | } |
717 | ||
1990af8d JB |
718 | /* Check for weak IVs if possible */ |
719 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 720 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
721 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
722 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
723 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
724 | rx->sta->wep_weak_iv_count++; | |
725 | ||
70f08765 JB |
726 | switch (rx->key->conf.alg) { |
727 | case ALG_WEP: | |
e2f036da MN |
728 | result = ieee80211_crypto_wep_decrypt(rx); |
729 | break; | |
70f08765 | 730 | case ALG_TKIP: |
e2f036da MN |
731 | result = ieee80211_crypto_tkip_decrypt(rx); |
732 | break; | |
70f08765 | 733 | case ALG_CCMP: |
e2f036da MN |
734 | result = ieee80211_crypto_ccmp_decrypt(rx); |
735 | break; | |
3cfcf6ac JM |
736 | case ALG_AES_CMAC: |
737 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
738 | break; | |
70f08765 JB |
739 | } |
740 | ||
e2f036da | 741 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 742 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
743 | |
744 | return result; | |
70f08765 JB |
745 | } |
746 | ||
572e0012 KV |
747 | static ieee80211_rx_result debug_noinline |
748 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
749 | { | |
750 | struct ieee80211_local *local; | |
751 | struct ieee80211_hdr *hdr; | |
752 | struct sk_buff *skb; | |
753 | ||
754 | local = rx->local; | |
755 | skb = rx->skb; | |
756 | hdr = (struct ieee80211_hdr *) skb->data; | |
757 | ||
758 | if (!local->pspolling) | |
759 | return RX_CONTINUE; | |
760 | ||
761 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
762 | /* this is not from AP */ | |
763 | return RX_CONTINUE; | |
764 | ||
765 | if (!ieee80211_is_data(hdr->frame_control)) | |
766 | return RX_CONTINUE; | |
767 | ||
768 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
769 | /* AP has no more frames buffered for us */ | |
770 | local->pspolling = false; | |
771 | return RX_CONTINUE; | |
772 | } | |
773 | ||
774 | /* more data bit is set, let's request a new frame from the AP */ | |
775 | ieee80211_send_pspoll(local, rx->sdata); | |
776 | ||
777 | return RX_CONTINUE; | |
778 | } | |
779 | ||
133b8226 | 780 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 781 | { |
133b8226 | 782 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 783 | struct ieee80211_local *local = sdata->local; |
0795af57 | 784 | |
3e122be0 | 785 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 786 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
24487981 | 787 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 788 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
789 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
790 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
791 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
792 | } | |
793 | ||
133b8226 | 794 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 795 | { |
133b8226 JB |
796 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
797 | struct ieee80211_local *local = sdata->local; | |
8f77f384 | 798 | int sent, buffered; |
571ecf67 | 799 | |
3e122be0 | 800 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 801 | |
07346f81 | 802 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
24487981 | 803 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta); |
004c872e JB |
804 | |
805 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
806 | sta_info_clear_tim_bit(sta); | |
807 | ||
571ecf67 | 808 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
809 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
810 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 811 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 812 | |
571ecf67 | 813 | /* Send all buffered frames to the station */ |
8f77f384 JB |
814 | sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); |
815 | buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); | |
816 | sent += buffered; | |
817 | local->total_ps_buffered -= buffered; | |
818 | ||
571ecf67 | 819 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
8f77f384 JB |
820 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " |
821 | "since STA not sleeping anymore\n", sdata->dev->name, | |
822 | sta->sta.addr, sta->sta.aid, sent - buffered, buffered); | |
571ecf67 | 823 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
824 | |
825 | return sent; | |
826 | } | |
827 | ||
49461622 | 828 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 829 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
830 | { |
831 | struct sta_info *sta = rx->sta; | |
a7767f95 | 832 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
833 | |
834 | if (!sta) | |
9ae54c84 | 835 | return RX_CONTINUE; |
571ecf67 | 836 | |
b291ba11 JB |
837 | /* |
838 | * Update last_rx only for IBSS packets which are for the current | |
839 | * BSSID to avoid keeping the current IBSS network alive in cases | |
840 | * where other STAs start using different BSSID. | |
841 | */ | |
05c914fe | 842 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 843 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 844 | NL80211_IFTYPE_ADHOC); |
46900298 | 845 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 | 846 | sta->last_rx = jiffies; |
b291ba11 JB |
847 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
848 | /* | |
33b64eb2 LCC |
849 | * Mesh beacons will update last_rx when if they are found to |
850 | * match the current local configuration when processed. | |
571ecf67 | 851 | */ |
b291ba11 | 852 | sta->last_rx = jiffies; |
571ecf67 JB |
853 | } |
854 | ||
5cf121c3 | 855 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 856 | return RX_CONTINUE; |
571ecf67 | 857 | |
3cf335d5 KV |
858 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
859 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
860 | ||
571ecf67 JB |
861 | sta->rx_fragments++; |
862 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 863 | sta->last_signal = rx->status->signal; |
566bfe5a | 864 | sta->last_qual = rx->status->qual; |
5cf121c3 | 865 | sta->last_noise = rx->status->noise; |
571ecf67 | 866 | |
72eaa43a JB |
867 | /* |
868 | * Change STA power saving mode only at the end of a frame | |
869 | * exchange sequence. | |
870 | */ | |
3e122be0 | 871 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
872 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
873 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
874 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
875 | /* | |
876 | * Ignore doze->wake transitions that are | |
877 | * indicated by non-data frames, the standard | |
878 | * is unclear here, but for example going to | |
879 | * PS mode and then scanning would cause a | |
880 | * doze->wake transition for the probe request, | |
881 | * and that is clearly undesirable. | |
882 | */ | |
883 | if (ieee80211_is_data(hdr->frame_control) && | |
884 | !ieee80211_has_pm(hdr->frame_control)) | |
885 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
886 | } else { | |
887 | if (ieee80211_has_pm(hdr->frame_control)) | |
888 | ap_sta_ps_start(sta); | |
889 | } | |
571ecf67 JB |
890 | } |
891 | ||
892 | /* Drop data::nullfunc frames silently, since they are used only to | |
893 | * control station power saving mode. */ | |
a7767f95 | 894 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
895 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
896 | /* Update counter and free packet here to avoid counting this | |
897 | * as a dropped packed. */ | |
898 | sta->rx_packets++; | |
899 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 900 | return RX_QUEUED; |
571ecf67 JB |
901 | } |
902 | ||
9ae54c84 | 903 | return RX_CONTINUE; |
571ecf67 JB |
904 | } /* ieee80211_rx_h_sta_process */ |
905 | ||
571ecf67 JB |
906 | static inline struct ieee80211_fragment_entry * |
907 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
908 | unsigned int frag, unsigned int seq, int rx_queue, | |
909 | struct sk_buff **skb) | |
910 | { | |
911 | struct ieee80211_fragment_entry *entry; | |
912 | int idx; | |
913 | ||
914 | idx = sdata->fragment_next; | |
915 | entry = &sdata->fragments[sdata->fragment_next++]; | |
916 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
917 | sdata->fragment_next = 0; | |
918 | ||
919 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 920 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
921 | struct ieee80211_hdr *hdr = |
922 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
923 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
924 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 925 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
926 | sdata->dev->name, idx, |
927 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 928 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 929 | #endif |
571ecf67 JB |
930 | __skb_queue_purge(&entry->skb_list); |
931 | } | |
932 | ||
933 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
934 | *skb = NULL; | |
935 | entry->first_frag_time = jiffies; | |
936 | entry->seq = seq; | |
937 | entry->rx_queue = rx_queue; | |
938 | entry->last_frag = frag; | |
939 | entry->ccmp = 0; | |
940 | entry->extra_len = 0; | |
941 | ||
942 | return entry; | |
943 | } | |
944 | ||
945 | static inline struct ieee80211_fragment_entry * | |
946 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 947 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
948 | int rx_queue, struct ieee80211_hdr *hdr) |
949 | { | |
950 | struct ieee80211_fragment_entry *entry; | |
951 | int i, idx; | |
952 | ||
953 | idx = sdata->fragment_next; | |
954 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
955 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
956 | |
957 | idx--; | |
958 | if (idx < 0) | |
959 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
960 | ||
961 | entry = &sdata->fragments[idx]; | |
962 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
963 | entry->rx_queue != rx_queue || | |
964 | entry->last_frag + 1 != frag) | |
965 | continue; | |
966 | ||
b73d70ad | 967 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 968 | |
b73d70ad HH |
969 | /* |
970 | * Check ftype and addresses are equal, else check next fragment | |
971 | */ | |
972 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
973 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
974 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
975 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
976 | continue; | |
977 | ||
ab46623e | 978 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
979 | __skb_queue_purge(&entry->skb_list); |
980 | continue; | |
981 | } | |
982 | return entry; | |
983 | } | |
984 | ||
985 | return NULL; | |
986 | } | |
987 | ||
49461622 | 988 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 989 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
990 | { |
991 | struct ieee80211_hdr *hdr; | |
992 | u16 sc; | |
358c8d9d | 993 | __le16 fc; |
571ecf67 JB |
994 | unsigned int frag, seq; |
995 | struct ieee80211_fragment_entry *entry; | |
996 | struct sk_buff *skb; | |
997 | ||
b73d70ad | 998 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 999 | fc = hdr->frame_control; |
571ecf67 JB |
1000 | sc = le16_to_cpu(hdr->seq_ctrl); |
1001 | frag = sc & IEEE80211_SCTL_FRAG; | |
1002 | ||
358c8d9d | 1003 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1004 | (rx->skb)->len < 24 || |
1005 | is_multicast_ether_addr(hdr->addr1))) { | |
1006 | /* not fragmented */ | |
1007 | goto out; | |
1008 | } | |
1009 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1010 | ||
1011 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1012 | ||
1013 | if (frag == 0) { | |
1014 | /* This is the first fragment of a new frame. */ | |
1015 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1016 | rx->queue, &(rx->skb)); |
8f20fc24 | 1017 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1018 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1019 | /* Store CCMP PN so that we can verify that the next |
1020 | * fragment has a sequential PN value. */ | |
1021 | entry->ccmp = 1; | |
1022 | memcpy(entry->last_pn, | |
5cf121c3 | 1023 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1024 | CCMP_PN_LEN); |
1025 | } | |
9ae54c84 | 1026 | return RX_QUEUED; |
571ecf67 JB |
1027 | } |
1028 | ||
1029 | /* This is a fragment for a frame that should already be pending in | |
1030 | * fragment cache. Add this fragment to the end of the pending entry. | |
1031 | */ | |
b73d70ad | 1032 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1033 | if (!entry) { |
1034 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1035 | return RX_DROP_MONITOR; |
571ecf67 JB |
1036 | } |
1037 | ||
1038 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1039 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1040 | if (entry->ccmp) { | |
1041 | int i; | |
1042 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1043 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1044 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1045 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1046 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1047 | pn[i]++; | |
1048 | if (pn[i]) | |
1049 | break; | |
1050 | } | |
5cf121c3 | 1051 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1052 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1053 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1054 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1055 | } | |
1056 | ||
358c8d9d | 1057 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1058 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1059 | entry->last_frag = frag; | |
1060 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1061 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1062 | rx->skb = NULL; |
9ae54c84 | 1063 | return RX_QUEUED; |
571ecf67 JB |
1064 | } |
1065 | ||
1066 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1067 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1068 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1069 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1070 | GFP_ATOMIC))) { | |
1071 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1072 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1073 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1074 | } |
1075 | } | |
1076 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1077 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1078 | dev_kfree_skb(skb); | |
1079 | } | |
1080 | ||
1081 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1082 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1083 | |
1084 | out: | |
1085 | if (rx->sta) | |
1086 | rx->sta->rx_packets++; | |
1087 | if (is_multicast_ether_addr(hdr->addr1)) | |
1088 | rx->local->dot11MulticastReceivedFrameCount++; | |
1089 | else | |
1090 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1091 | return RX_CONTINUE; |
571ecf67 JB |
1092 | } |
1093 | ||
49461622 | 1094 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1095 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1096 | { |
98f0b0a3 | 1097 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1098 | struct sk_buff *skb; |
1099 | int no_pending_pkts; | |
358c8d9d | 1100 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1101 | |
358c8d9d | 1102 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1103 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1104 | return RX_CONTINUE; |
571ecf67 | 1105 | |
05c914fe JB |
1106 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1107 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1108 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1109 | |
571ecf67 JB |
1110 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1111 | if (!skb) { | |
1112 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1113 | if (skb) | |
1114 | rx->local->total_ps_buffered--; | |
1115 | } | |
1116 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1117 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1118 | ||
1119 | if (skb) { | |
1120 | struct ieee80211_hdr *hdr = | |
1121 | (struct ieee80211_hdr *) skb->data; | |
1122 | ||
4a9a66e9 JB |
1123 | /* |
1124 | * Tell TX path to send one frame even though the STA may | |
1125 | * still remain is PS mode after this frame exchange. | |
1126 | */ | |
07346f81 | 1127 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1128 | |
1129 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1130 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1131 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1132 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1133 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1134 | ||
1135 | /* Use MoreData flag to indicate whether there are more | |
1136 | * buffered frames for this STA */ | |
836341a7 | 1137 | if (no_pending_pkts) |
571ecf67 | 1138 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1139 | else |
571ecf67 JB |
1140 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1141 | ||
1142 | dev_queue_xmit(skb); | |
1143 | ||
004c872e JB |
1144 | if (no_pending_pkts) |
1145 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1146 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1147 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1148 | /* |
1149 | * FIXME: This can be the result of a race condition between | |
1150 | * us expiring a frame and the station polling for it. | |
1151 | * Should we send it a null-func frame indicating we | |
1152 | * have nothing buffered for it? | |
1153 | */ | |
0c68ae26 | 1154 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1155 | "though there are no buffered frames for it\n", |
0c68ae26 | 1156 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1157 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1158 | } |
1159 | ||
9ae54c84 | 1160 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1161 | * count as an dropped frame. */ |
1162 | dev_kfree_skb(rx->skb); | |
1163 | ||
9ae54c84 | 1164 | return RX_QUEUED; |
571ecf67 JB |
1165 | } |
1166 | ||
49461622 | 1167 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1168 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1169 | { |
6e0d114d | 1170 | u8 *data = rx->skb->data; |
238f74a2 | 1171 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1172 | |
238f74a2 | 1173 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1174 | return RX_CONTINUE; |
6e0d114d JB |
1175 | |
1176 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1177 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1178 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1179 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1180 | /* change frame type to non QOS */ |
238f74a2 | 1181 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1182 | |
9ae54c84 | 1183 | return RX_CONTINUE; |
6e0d114d JB |
1184 | } |
1185 | ||
76ee65bf | 1186 | static int |
5cf121c3 | 1187 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1188 | { |
07346f81 | 1189 | if (unlikely(!rx->sta || |
f4ea83dd | 1190 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1191 | return -EACCES; |
571ecf67 | 1192 | |
76ee65bf | 1193 | return 0; |
571ecf67 JB |
1194 | } |
1195 | ||
76ee65bf | 1196 | static int |
358c8d9d | 1197 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1198 | { |
3017b80b | 1199 | /* |
7848ba7d JB |
1200 | * Pass through unencrypted frames if the hardware has |
1201 | * decrypted them already. | |
3017b80b | 1202 | */ |
5cf121c3 | 1203 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1204 | return 0; |
571ecf67 JB |
1205 | |
1206 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1207 | if (unlikely(!ieee80211_has_protected(fc) && |
1208 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1209 | ieee80211_is_data(fc) && |
b3fc9c6c | 1210 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1211 | return -EACCES; |
f2ca3ea4 JM |
1212 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1213 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1214 | rx->key)) | |
1215 | return -EACCES; | |
1216 | /* BIP does not use Protected field, so need to check MMIE */ | |
1217 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) | |
1218 | && ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
1219 | rx->key)) | |
1220 | return -EACCES; | |
1221 | /* | |
1222 | * When using MFP, Action frames are not allowed prior to | |
1223 | * having configured keys. | |
1224 | */ | |
1225 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1226 | ieee80211_is_robust_mgmt_frame( | |
1227 | (struct ieee80211_hdr *) rx->skb->data))) | |
1228 | return -EACCES; | |
1229 | } | |
b3fc9c6c | 1230 | |
76ee65bf | 1231 | return 0; |
571ecf67 JB |
1232 | } |
1233 | ||
76ee65bf | 1234 | static int |
e31a16d6 | 1235 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1236 | { |
1237 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1238 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1239 | ||
e31a16d6 | 1240 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
76ee65bf | 1241 | } |
571ecf67 | 1242 | |
ce3edf6d JB |
1243 | /* |
1244 | * requires that rx->skb is a frame with ethernet header | |
1245 | */ | |
358c8d9d | 1246 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1247 | { |
c97c23e3 | 1248 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1249 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1250 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1251 | ||
1252 | /* | |
1253 | * Allow EAPOL frames to us/the PAE group address regardless | |
1254 | * of whether the frame was encrypted or not. | |
1255 | */ | |
1256 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1257 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1258 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1259 | return true; | |
1260 | ||
1261 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1262 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1263 | return false; |
1264 | ||
1265 | return true; | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * requires that rx->skb is a frame with ethernet header | |
1270 | */ | |
76ee65bf | 1271 | static void |
5cf121c3 | 1272 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1273 | { |
1274 | struct net_device *dev = rx->dev; | |
1275 | struct ieee80211_local *local = rx->local; | |
1276 | struct sk_buff *skb, *xmit_skb; | |
1277 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1278 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1279 | struct sta_info *dsta; | |
571ecf67 | 1280 | |
76ee65bf RR |
1281 | skb = rx->skb; |
1282 | xmit_skb = NULL; | |
571ecf67 | 1283 | |
05c914fe JB |
1284 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1285 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1286 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1287 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1288 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1289 | /* | |
1290 | * send multicast frames both to higher layers in | |
1291 | * local net stack and back to the wireless medium | |
1292 | */ | |
76ee65bf RR |
1293 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1294 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1295 | printk(KERN_DEBUG "%s: failed to clone " |
1296 | "multicast frame\n", dev->name); | |
1297 | } else { | |
571ecf67 | 1298 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1299 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1300 | /* |
1301 | * The destination station is associated to | |
1302 | * this AP (in this VLAN), so send the frame | |
1303 | * directly to it and do not pass it to local | |
1304 | * net stack. | |
571ecf67 | 1305 | */ |
76ee65bf | 1306 | xmit_skb = skb; |
571ecf67 JB |
1307 | skb = NULL; |
1308 | } | |
571ecf67 JB |
1309 | } |
1310 | } | |
1311 | ||
1312 | if (skb) { | |
d1c3a37c JB |
1313 | int align __maybe_unused; |
1314 | ||
1315 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1316 | /* | |
1317 | * 'align' will only take the values 0 or 2 here | |
1318 | * since all frames are required to be aligned | |
1319 | * to 2-byte boundaries when being passed to | |
1320 | * mac80211. That also explains the __skb_push() | |
1321 | * below. | |
1322 | */ | |
dacb6f1d | 1323 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
d1c3a37c JB |
1324 | if (align) { |
1325 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1326 | dev_kfree_skb(skb); | |
1327 | skb = NULL; | |
1328 | } else { | |
1329 | u8 *data = skb->data; | |
1330 | size_t len = skb->len; | |
1331 | u8 *new = __skb_push(skb, align); | |
1332 | memmove(new, data, len); | |
1333 | __skb_trim(skb, len); | |
1334 | } | |
1335 | } | |
1336 | #endif | |
1337 | ||
1338 | if (skb) { | |
1339 | /* deliver to local stack */ | |
1340 | skb->protocol = eth_type_trans(skb, dev); | |
1341 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1342 | netif_rx(skb); | |
1343 | } | |
571ecf67 JB |
1344 | } |
1345 | ||
76ee65bf | 1346 | if (xmit_skb) { |
571ecf67 | 1347 | /* send to wireless media */ |
f831e909 | 1348 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1349 | skb_reset_network_header(xmit_skb); |
1350 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1351 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1352 | } |
76ee65bf RR |
1353 | } |
1354 | ||
49461622 | 1355 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1356 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1357 | { |
1358 | struct net_device *dev = rx->dev; | |
1359 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1360 | u16 ethertype; |
fd4c7f2f RR |
1361 | u8 *payload; |
1362 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1363 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1364 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1365 | const struct ethhdr *eth; |
1366 | int remaining, err; | |
1367 | u8 dst[ETH_ALEN]; | |
1368 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1369 | |
358c8d9d | 1370 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1371 | return RX_CONTINUE; |
fd4c7f2f | 1372 | |
358c8d9d | 1373 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1374 | return RX_DROP_MONITOR; |
fd4c7f2f | 1375 | |
5cf121c3 | 1376 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1377 | return RX_CONTINUE; |
fd4c7f2f | 1378 | |
e31a16d6 | 1379 | err = __ieee80211_data_to_8023(rx); |
fd4c7f2f | 1380 | if (unlikely(err)) |
e4c26add | 1381 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1382 | |
1383 | skb->dev = dev; | |
1384 | ||
1385 | dev->stats.rx_packets++; | |
1386 | dev->stats.rx_bytes += skb->len; | |
1387 | ||
1388 | /* skip the wrapping header */ | |
1389 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1390 | if (!eth) | |
e4c26add | 1391 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1392 | |
1393 | while (skb != frame) { | |
1394 | u8 padding; | |
1395 | __be16 len = eth->h_proto; | |
1396 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1397 | ||
1398 | remaining = skb->len; | |
1399 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1400 | memcpy(src, eth->h_source, ETH_ALEN); | |
1401 | ||
1402 | padding = ((4 - subframe_len) & 0x3); | |
1403 | /* the last MSDU has no padding */ | |
f4ea83dd | 1404 | if (subframe_len > remaining) |
e4c26add | 1405 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1406 | |
1407 | skb_pull(skb, sizeof(struct ethhdr)); | |
1408 | /* if last subframe reuse skb */ | |
1409 | if (remaining <= subframe_len + padding) | |
1410 | frame = skb; | |
1411 | else { | |
d1c3a37c JB |
1412 | /* |
1413 | * Allocate and reserve two bytes more for payload | |
1414 | * alignment since sizeof(struct ethhdr) is 14. | |
1415 | */ | |
1416 | frame = dev_alloc_skb( | |
1417 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1418 | subframe_len + 2); | |
fd4c7f2f RR |
1419 | |
1420 | if (frame == NULL) | |
e4c26add | 1421 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1422 | |
d1c3a37c JB |
1423 | skb_reserve(frame, |
1424 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1425 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1426 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1427 | ntohs(len)); | |
1428 | ||
1429 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1430 | padding); | |
1431 | if (!eth) { | |
fd4c7f2f | 1432 | dev_kfree_skb(frame); |
e4c26add | 1433 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1434 | } |
1435 | } | |
1436 | ||
ce3edf6d | 1437 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1438 | frame->dev = dev; |
1439 | frame->priority = skb->priority; | |
1440 | rx->skb = frame; | |
1441 | ||
fd4c7f2f RR |
1442 | payload = frame->data; |
1443 | ethertype = (payload[6] << 8) | payload[7]; | |
1444 | ||
1445 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1446 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1447 | compare_ether_addr(payload, | |
1448 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1449 | /* remove RFC1042 or Bridge-Tunnel |
1450 | * encapsulation and replace EtherType */ | |
1451 | skb_pull(frame, 6); | |
1452 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1453 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1454 | } else { | |
ce3edf6d JB |
1455 | memcpy(skb_push(frame, sizeof(__be16)), |
1456 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1457 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1458 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1459 | } | |
1460 | ||
358c8d9d | 1461 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1462 | if (skb == frame) /* last frame */ |
e4c26add | 1463 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1464 | dev_kfree_skb(frame); |
1465 | continue; | |
1466 | } | |
fd4c7f2f RR |
1467 | |
1468 | ieee80211_deliver_skb(rx); | |
1469 | } | |
1470 | ||
9ae54c84 | 1471 | return RX_QUEUED; |
fd4c7f2f RR |
1472 | } |
1473 | ||
bf94e17b | 1474 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1475 | static ieee80211_rx_result |
e32f85f7 LCC |
1476 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1477 | { | |
1478 | struct ieee80211_hdr *hdr; | |
1479 | struct ieee80211s_hdr *mesh_hdr; | |
1480 | unsigned int hdrlen; | |
1481 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
3b8d81e0 | 1482 | struct ieee80211_local *local = rx->local; |
249b405c | 1483 | struct ieee80211_sub_if_data *sdata; |
e32f85f7 LCC |
1484 | |
1485 | hdr = (struct ieee80211_hdr *) skb->data; | |
1486 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1487 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
249b405c | 1488 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
e32f85f7 LCC |
1489 | |
1490 | if (!ieee80211_is_data(hdr->frame_control)) | |
1491 | return RX_CONTINUE; | |
1492 | ||
1493 | if (!mesh_hdr->ttl) | |
1494 | /* illegal frame */ | |
1495 | return RX_DROP_MONITOR; | |
1496 | ||
79617dee | 1497 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
79617dee Y |
1498 | struct mesh_path *mppath; |
1499 | ||
79617dee Y |
1500 | rcu_read_lock(); |
1501 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1502 | if (!mppath) { | |
1503 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1504 | } else { | |
1505 | spin_lock_bh(&mppath->state_lock); | |
1506 | mppath->exp_time = jiffies; | |
1507 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1508 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1509 | spin_unlock_bh(&mppath->state_lock); | |
1510 | } | |
1511 | rcu_read_unlock(); | |
1512 | } | |
1513 | ||
e32f85f7 LCC |
1514 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1515 | return RX_CONTINUE; | |
1516 | ||
1517 | mesh_hdr->ttl--; | |
1518 | ||
1519 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1520 | if (!mesh_hdr->ttl) | |
472dbc45 | 1521 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1522 | dropped_frames_ttl); |
1523 | else { | |
1524 | struct ieee80211_hdr *fwd_hdr; | |
3b8d81e0 JB |
1525 | struct ieee80211_tx_info *info; |
1526 | ||
e32f85f7 LCC |
1527 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
1528 | ||
1529 | if (!fwd_skb && net_ratelimit()) | |
1530 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1531 | rx->dev->name); | |
1532 | ||
1533 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1534 | /* | |
1535 | * Save TA to addr1 to send TA a path error if a | |
1536 | * suitable next hop is not found | |
1537 | */ | |
1538 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1539 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
3b8d81e0 JB |
1540 | info = IEEE80211_SKB_CB(fwd_skb); |
1541 | memset(info, 0, sizeof(*info)); | |
1542 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
5061b0c2 | 1543 | info->control.vif = &rx->sdata->vif; |
3b8d81e0 | 1544 | ieee80211_select_queue(local, fwd_skb); |
249b405c JC |
1545 | if (is_multicast_ether_addr(fwd_hdr->addr3)) |
1546 | memcpy(fwd_hdr->addr1, fwd_hdr->addr3, | |
1547 | ETH_ALEN); | |
1548 | else { | |
1549 | int err = mesh_nexthop_lookup(fwd_skb, sdata); | |
1550 | /* Failed to immediately resolve next hop: | |
1551 | * fwded frame was dropped or will be added | |
1552 | * later to the pending skb queue. */ | |
1553 | if (err) | |
1554 | return RX_DROP_MONITOR; | |
1555 | } | |
1556 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, | |
1557 | fwded_frames); | |
3b8d81e0 | 1558 | ieee80211_add_pending_skb(local, fwd_skb); |
e32f85f7 LCC |
1559 | } |
1560 | } | |
1561 | ||
1562 | if (is_multicast_ether_addr(hdr->addr3) || | |
1563 | rx->dev->flags & IFF_PROMISC) | |
1564 | return RX_CONTINUE; | |
1565 | else | |
1566 | return RX_DROP_MONITOR; | |
1567 | } | |
bf94e17b | 1568 | #endif |
e32f85f7 | 1569 | |
49461622 | 1570 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1571 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1572 | { |
1573 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1574 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1575 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1576 | int err; |
76ee65bf | 1577 | |
358c8d9d | 1578 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1579 | return RX_CONTINUE; |
76ee65bf | 1580 | |
358c8d9d | 1581 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1582 | return RX_DROP_MONITOR; |
76ee65bf | 1583 | |
e31a16d6 | 1584 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1585 | if (unlikely(err)) |
e4c26add | 1586 | return RX_DROP_UNUSABLE; |
76ee65bf | 1587 | |
358c8d9d | 1588 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1589 | return RX_DROP_MONITOR; |
ce3edf6d | 1590 | |
76ee65bf RR |
1591 | rx->skb->dev = dev; |
1592 | ||
1593 | dev->stats.rx_packets++; | |
1594 | dev->stats.rx_bytes += rx->skb->len; | |
1595 | ||
1596 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1597 | |
9ae54c84 | 1598 | return RX_QUEUED; |
571ecf67 JB |
1599 | } |
1600 | ||
49461622 | 1601 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1602 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1603 | { |
1604 | struct ieee80211_local *local = rx->local; | |
1605 | struct ieee80211_hw *hw = &local->hw; | |
1606 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1607 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1608 | struct tid_ampdu_rx *tid_agg_rx; |
1609 | u16 start_seq_num; | |
1610 | u16 tid; | |
1611 | ||
a7767f95 | 1612 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1613 | return RX_CONTINUE; |
71364716 | 1614 | |
a7767f95 | 1615 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1616 | if (!rx->sta) |
9ae54c84 | 1617 | return RX_CONTINUE; |
71364716 | 1618 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1619 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1620 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1621 | return RX_CONTINUE; |
cee24a3e | 1622 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1623 | |
1624 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1625 | ||
1626 | /* reset session timer */ | |
20ad19d0 JB |
1627 | if (tid_agg_rx->timeout) |
1628 | mod_timer(&tid_agg_rx->session_timer, | |
1629 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1630 | |
1631 | /* manage reordering buffer according to requested */ | |
1632 | /* sequence number */ | |
1633 | rcu_read_lock(); | |
f1d58c25 | 1634 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, |
71364716 RR |
1635 | start_seq_num, 1); |
1636 | rcu_read_unlock(); | |
e4c26add | 1637 | return RX_DROP_UNUSABLE; |
71364716 RR |
1638 | } |
1639 | ||
9ae54c84 | 1640 | return RX_CONTINUE; |
71364716 RR |
1641 | } |
1642 | ||
f4f727a6 JM |
1643 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1644 | struct ieee80211_mgmt *mgmt, | |
1645 | size_t len) | |
fea14732 JM |
1646 | { |
1647 | struct ieee80211_local *local = sdata->local; | |
1648 | struct sk_buff *skb; | |
1649 | struct ieee80211_mgmt *resp; | |
1650 | ||
1651 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1652 | /* Not to own unicast address */ | |
1653 | return; | |
1654 | } | |
1655 | ||
46900298 JB |
1656 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1657 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
77fdaa12 | 1658 | /* Not from the current AP or not associated yet. */ |
fea14732 JM |
1659 | return; |
1660 | } | |
1661 | ||
1662 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1663 | /* Too short SA Query request frame */ | |
1664 | return; | |
1665 | } | |
1666 | ||
1667 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1668 | if (skb == NULL) | |
1669 | return; | |
1670 | ||
1671 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1672 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1673 | memset(resp, 0, 24); | |
1674 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1675 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1676 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1677 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1678 | IEEE80211_STYPE_ACTION); | |
1679 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1680 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1681 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1682 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1683 | mgmt->u.action.u.sa_query.trans_id, | |
1684 | WLAN_SA_QUERY_TR_ID_LEN); | |
1685 | ||
1686 | ieee80211_tx_skb(sdata, skb, 1); | |
1687 | } | |
1688 | ||
de1ede7a JB |
1689 | static ieee80211_rx_result debug_noinline |
1690 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1691 | { | |
1692 | struct ieee80211_local *local = rx->local; | |
1693 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1694 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
1695 | int len = rx->skb->len; | |
1696 | ||
1697 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1698 | return RX_CONTINUE; | |
1699 | ||
1700 | if (!rx->sta) | |
1701 | return RX_DROP_MONITOR; | |
1702 | ||
1703 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1704 | return RX_DROP_MONITOR; | |
1705 | ||
97ebe12a JM |
1706 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1707 | return RX_DROP_MONITOR; | |
1708 | ||
de1ede7a JB |
1709 | /* all categories we currently handle have action_code */ |
1710 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1711 | return RX_DROP_MONITOR; | |
1712 | ||
de1ede7a JB |
1713 | switch (mgmt->u.action.category) { |
1714 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1715 | /* |
1716 | * The aggregation code is not prepared to handle | |
1717 | * anything but STA/AP due to the BSSID handling; | |
1718 | * IBSS could work in the code but isn't supported | |
1719 | * by drivers or the standard. | |
1720 | */ | |
1721 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1722 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1723 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1724 | return RX_DROP_MONITOR; | |
1725 | ||
de1ede7a JB |
1726 | switch (mgmt->u.action.u.addba_req.action_code) { |
1727 | case WLAN_ACTION_ADDBA_REQ: | |
1728 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1729 | sizeof(mgmt->u.action.u.addba_req))) | |
1730 | return RX_DROP_MONITOR; | |
1731 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1732 | break; | |
1733 | case WLAN_ACTION_ADDBA_RESP: | |
1734 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1735 | sizeof(mgmt->u.action.u.addba_resp))) | |
1736 | return RX_DROP_MONITOR; | |
1737 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1738 | break; | |
1739 | case WLAN_ACTION_DELBA: | |
1740 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1741 | sizeof(mgmt->u.action.u.delba))) | |
1742 | return RX_DROP_MONITOR; | |
1743 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1744 | break; | |
1745 | } | |
39192c0b JB |
1746 | break; |
1747 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1748 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1749 | return RX_DROP_MONITOR; | |
46900298 JB |
1750 | |
1751 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1752 | return RX_DROP_MONITOR; | |
1753 | ||
39192c0b JB |
1754 | switch (mgmt->u.action.u.measurement.action_code) { |
1755 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1756 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1757 | sizeof(mgmt->u.action.u.measurement))) | |
1758 | return RX_DROP_MONITOR; | |
1759 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1760 | break; | |
c481ec97 S |
1761 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1762 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1763 | sizeof(mgmt->u.action.u.chan_switch))) | |
1764 | return RX_DROP_MONITOR; | |
1765 | ||
cc32abd4 JB |
1766 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1767 | return RX_DROP_MONITOR; | |
1768 | ||
46900298 | 1769 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1770 | return RX_DROP_MONITOR; |
1771 | ||
77fdaa12 | 1772 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
39192c0b JB |
1773 | } |
1774 | break; | |
fea14732 JM |
1775 | case WLAN_CATEGORY_SA_QUERY: |
1776 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1777 | sizeof(mgmt->u.action.u.sa_query))) | |
1778 | return RX_DROP_MONITOR; | |
1779 | switch (mgmt->u.action.u.sa_query.action) { | |
1780 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1781 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1782 | return RX_DROP_MONITOR; | |
1783 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1784 | break; | |
1785 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1786 | /* | |
1787 | * SA Query response is currently only used in AP mode | |
1788 | * and it is processed in user space. | |
1789 | */ | |
1790 | return RX_CONTINUE; | |
1791 | } | |
1792 | break; | |
39192c0b JB |
1793 | default: |
1794 | return RX_CONTINUE; | |
de1ede7a JB |
1795 | } |
1796 | ||
39192c0b JB |
1797 | rx->sta->rx_packets++; |
1798 | dev_kfree_skb(rx->skb); | |
1799 | return RX_QUEUED; | |
de1ede7a JB |
1800 | } |
1801 | ||
49461622 | 1802 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1803 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1804 | { |
759ef3eb | 1805 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1806 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1807 | |
5cf121c3 | 1808 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1809 | return RX_DROP_MONITOR; |
571ecf67 | 1810 | |
97ebe12a JM |
1811 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1812 | return RX_DROP_MONITOR; | |
1813 | ||
472dbc45 | 1814 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
f1d58c25 | 1815 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
472dbc45 | 1816 | |
3832c287 | 1817 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
f1d58c25 | 1818 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
f9d540ee | 1819 | |
7986cf95 | 1820 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
f1d58c25 | 1821 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
46900298 | 1822 | |
7986cf95 | 1823 | return RX_DROP_MONITOR; |
571ecf67 JB |
1824 | } |
1825 | ||
3b8d81e0 | 1826 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
5cf121c3 | 1827 | struct ieee80211_rx_data *rx) |
571ecf67 | 1828 | { |
a7767f95 HH |
1829 | int keyidx; |
1830 | unsigned int hdrlen; | |
571ecf67 | 1831 | |
a7767f95 | 1832 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1833 | if (rx->skb->len >= hdrlen + 4) |
1834 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1835 | else | |
1836 | keyidx = -1; | |
1837 | ||
8944b79f | 1838 | if (!rx->sta) { |
aa0daf0e JB |
1839 | /* |
1840 | * Some hardware seem to generate incorrect Michael MIC | |
1841 | * reports; ignore them to avoid triggering countermeasures. | |
1842 | */ | |
571ecf67 JB |
1843 | goto ignore; |
1844 | } | |
1845 | ||
a7767f95 | 1846 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1847 | goto ignore; |
571ecf67 | 1848 | |
05c914fe | 1849 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1850 | /* |
1851 | * APs with pairwise keys should never receive Michael MIC | |
1852 | * errors for non-zero keyidx because these are reserved for | |
1853 | * group keys and only the AP is sending real multicast | |
1854 | * frames in the BSS. | |
1855 | */ | |
eb063c17 | 1856 | goto ignore; |
571ecf67 JB |
1857 | } |
1858 | ||
a7767f95 HH |
1859 | if (!ieee80211_is_data(hdr->frame_control) && |
1860 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1861 | goto ignore; |
571ecf67 | 1862 | |
e6d6e342 JB |
1863 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
1864 | GFP_ATOMIC); | |
571ecf67 JB |
1865 | ignore: |
1866 | dev_kfree_skb(rx->skb); | |
1867 | rx->skb = NULL; | |
1868 | } | |
1869 | ||
5cf121c3 JB |
1870 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1871 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1872 | { |
1873 | struct ieee80211_sub_if_data *sdata; | |
1874 | struct ieee80211_local *local = rx->local; | |
1875 | struct ieee80211_rtap_hdr { | |
1876 | struct ieee80211_radiotap_header hdr; | |
1877 | u8 flags; | |
1878 | u8 rate; | |
1879 | __le16 chan_freq; | |
1880 | __le16 chan_flags; | |
1881 | } __attribute__ ((packed)) *rthdr; | |
1882 | struct sk_buff *skb = rx->skb, *skb2; | |
1883 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1884 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1885 | |
5cf121c3 | 1886 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1887 | goto out_free_skb; |
1888 | ||
1889 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1890 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1891 | goto out_free_skb; | |
1892 | ||
1893 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1894 | memset(rthdr, 0, sizeof(*rthdr)); | |
1895 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1896 | rthdr->hdr.it_present = | |
1897 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1898 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1899 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1900 | ||
5cf121c3 | 1901 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1902 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1903 | ||
1904 | if (status->band == IEEE80211_BAND_5GHZ) | |
1905 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1906 | IEEE80211_CHAN_5GHZ); | |
1907 | else | |
1908 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1909 | IEEE80211_CHAN_2GHZ); | |
1910 | ||
1911 | skb_set_mac_header(skb, 0); | |
1912 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1913 | skb->pkt_type = PACKET_OTHERHOST; | |
1914 | skb->protocol = htons(ETH_P_802_2); | |
1915 | ||
1916 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1917 | if (!netif_running(sdata->dev)) | |
1918 | continue; | |
1919 | ||
05c914fe | 1920 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1921 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1922 | continue; | |
1923 | ||
1924 | if (prev_dev) { | |
1925 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1926 | if (skb2) { | |
1927 | skb2->dev = prev_dev; | |
1928 | netif_rx(skb2); | |
1929 | } | |
1930 | } | |
1931 | ||
1932 | prev_dev = sdata->dev; | |
1933 | sdata->dev->stats.rx_packets++; | |
1934 | sdata->dev->stats.rx_bytes += skb->len; | |
1935 | } | |
1936 | ||
1937 | if (prev_dev) { | |
1938 | skb->dev = prev_dev; | |
1939 | netif_rx(skb); | |
1940 | skb = NULL; | |
1941 | } else | |
1942 | goto out_free_skb; | |
1943 | ||
5cf121c3 | 1944 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1945 | return; |
1946 | ||
1947 | out_free_skb: | |
1948 | dev_kfree_skb(skb); | |
1949 | } | |
1950 | ||
571ecf67 | 1951 | |
8944b79f | 1952 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1953 | struct ieee80211_rx_data *rx, |
8944b79f | 1954 | struct sk_buff *skb) |
58905290 | 1955 | { |
58905290 JB |
1956 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1957 | ||
8944b79f JB |
1958 | rx->skb = skb; |
1959 | rx->sdata = sdata; | |
1960 | rx->dev = sdata->dev; | |
1961 | ||
e32f85f7 LCC |
1962 | #define CALL_RXH(rxh) \ |
1963 | do { \ | |
1964 | res = rxh(rx); \ | |
1965 | if (res != RX_CONTINUE) \ | |
1966 | goto rxh_done; \ | |
1967 | } while (0); | |
49461622 JB |
1968 | |
1969 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1970 | CALL_RXH(ieee80211_rx_h_check) | |
1971 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 1972 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
1973 | CALL_RXH(ieee80211_rx_h_sta_process) |
1974 | CALL_RXH(ieee80211_rx_h_defragment) | |
1975 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1976 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1977 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1978 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1979 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1980 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1981 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1982 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1983 | #endif |
49461622 JB |
1984 | CALL_RXH(ieee80211_rx_h_data) |
1985 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1986 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1987 | CALL_RXH(ieee80211_rx_h_mgmt) |
1988 | ||
1989 | #undef CALL_RXH | |
1990 | ||
1991 | rxh_done: | |
58905290 JB |
1992 | switch (res) { |
1993 | case RX_DROP_MONITOR: | |
49461622 JB |
1994 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1995 | if (rx->sta) | |
1996 | rx->sta->rx_dropped++; | |
1997 | /* fall through */ | |
1998 | case RX_CONTINUE: | |
3d30d949 MW |
1999 | ieee80211_rx_cooked_monitor(rx); |
2000 | break; | |
58905290 | 2001 | case RX_DROP_UNUSABLE: |
49461622 JB |
2002 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2003 | if (rx->sta) | |
2004 | rx->sta->rx_dropped++; | |
58905290 JB |
2005 | dev_kfree_skb(rx->skb); |
2006 | break; | |
49461622 JB |
2007 | case RX_QUEUED: |
2008 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2009 | break; | |
58905290 JB |
2010 | } |
2011 | } | |
2012 | ||
571ecf67 JB |
2013 | /* main receive path */ |
2014 | ||
23a24def | 2015 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2016 | struct ieee80211_rx_data *rx, |
23a24def JB |
2017 | struct ieee80211_hdr *hdr) |
2018 | { | |
7ab17c45 | 2019 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2020 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2021 | ||
51fb61e7 | 2022 | switch (sdata->vif.type) { |
05c914fe | 2023 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2024 | if (!bssid) |
2025 | return 0; | |
77fdaa12 JB |
2026 | if (!multicast && |
2027 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { | |
4150c572 | 2028 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2029 | return 0; |
5cf121c3 | 2030 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2031 | } |
2032 | break; | |
05c914fe | 2033 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2034 | if (!bssid) |
2035 | return 0; | |
a7767f95 | 2036 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2037 | return 1; |
87291c02 | 2038 | } |
46900298 | 2039 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2040 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2041 | return 0; |
5cf121c3 | 2042 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2043 | } else if (!multicast && |
2044 | compare_ether_addr(sdata->dev->dev_addr, | |
2045 | hdr->addr1) != 0) { | |
4150c572 | 2046 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2047 | return 0; |
5cf121c3 | 2048 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2049 | } else if (!rx->sta) { |
2050 | int rate_idx; | |
2051 | if (rx->status->flag & RX_FLAG_HT) | |
2052 | rate_idx = 0; /* TODO: HT rates */ | |
2053 | else | |
2054 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2055 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2056 | BIT(rate_idx)); |
2057 | } | |
23a24def | 2058 | break; |
05c914fe | 2059 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2060 | if (!multicast && |
2061 | compare_ether_addr(sdata->dev->dev_addr, | |
2062 | hdr->addr1) != 0) { | |
2063 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2064 | return 0; | |
2065 | ||
5cf121c3 | 2066 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2067 | } |
2068 | break; | |
05c914fe JB |
2069 | case NL80211_IFTYPE_AP_VLAN: |
2070 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2071 | if (!bssid) { |
2072 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2073 | hdr->addr1)) | |
2074 | return 0; | |
2075 | } else if (!ieee80211_bssid_match(bssid, | |
2076 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2077 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2078 | return 0; |
5cf121c3 | 2079 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2080 | } |
23a24def | 2081 | break; |
05c914fe | 2082 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2083 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2084 | return 0; |
2085 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2086 | return 0; | |
2087 | break; | |
05c914fe | 2088 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2089 | /* take everything */ |
2090 | break; | |
05c914fe JB |
2091 | case NL80211_IFTYPE_UNSPECIFIED: |
2092 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2093 | /* should never get here */ |
2094 | WARN_ON(1); | |
2095 | break; | |
23a24def JB |
2096 | } |
2097 | ||
2098 | return 1; | |
2099 | } | |
2100 | ||
571ecf67 | 2101 | /* |
6368e4b1 RR |
2102 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2103 | * be called with rcu_read_lock protection. | |
571ecf67 | 2104 | */ |
71ebb4aa RR |
2105 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2106 | struct sk_buff *skb, | |
8318d78a | 2107 | struct ieee80211_rate *rate) |
571ecf67 | 2108 | { |
f1d58c25 | 2109 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
571ecf67 JB |
2110 | struct ieee80211_local *local = hw_to_local(hw); |
2111 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2112 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2113 | struct ieee80211_rx_data rx; |
6368e4b1 | 2114 | int prepares; |
8e6f0032 JB |
2115 | struct ieee80211_sub_if_data *prev = NULL; |
2116 | struct sk_buff *skb_new; | |
571ecf67 | 2117 | |
358c8d9d | 2118 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2119 | memset(&rx, 0, sizeof(rx)); |
2120 | rx.skb = skb; | |
2121 | rx.local = local; | |
2122 | ||
5cf121c3 | 2123 | rx.status = status; |
5cf121c3 | 2124 | rx.rate = rate; |
72abd81b | 2125 | |
358c8d9d | 2126 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2127 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2128 | |
8944b79f JB |
2129 | rx.sta = sta_info_get(local, hdr->addr2); |
2130 | if (rx.sta) { | |
d0709a65 JB |
2131 | rx.sdata = rx.sta->sdata; |
2132 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2133 | } |
571ecf67 | 2134 | |
571ecf67 | 2135 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
3b8d81e0 | 2136 | ieee80211_rx_michael_mic_report(hdr, &rx); |
d0709a65 | 2137 | return; |
571ecf67 JB |
2138 | } |
2139 | ||
142b9f50 HS |
2140 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
2141 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) | |
5cf121c3 | 2142 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2143 | |
38f3714d | 2144 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2145 | ieee80211_verify_alignment(&rx); |
38f3714d | 2146 | |
571ecf67 JB |
2147 | skb = rx.skb; |
2148 | ||
79010420 | 2149 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2150 | if (!netif_running(sdata->dev)) |
2151 | continue; | |
2152 | ||
05c914fe | 2153 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2154 | continue; |
2155 | ||
5cf121c3 | 2156 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2157 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2158 | |
6368e4b1 | 2159 | if (!prepares) |
23a24def | 2160 | continue; |
8e6f0032 | 2161 | |
340e11f3 JB |
2162 | /* |
2163 | * frame is destined for this interface, but if it's not | |
2164 | * also for the previous one we handle that after the | |
2165 | * loop to avoid copying the SKB once too much | |
2166 | */ | |
2167 | ||
2168 | if (!prev) { | |
2169 | prev = sdata; | |
2170 | continue; | |
8e6f0032 | 2171 | } |
340e11f3 JB |
2172 | |
2173 | /* | |
2174 | * frame was destined for the previous interface | |
2175 | * so invoke RX handlers for it | |
2176 | */ | |
2177 | ||
2178 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2179 | if (!skb_new) { | |
2180 | if (net_ratelimit()) | |
2181 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2182 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2183 | wiphy_name(local->hw.wiphy), |
2184 | prev->dev->name); | |
340e11f3 JB |
2185 | continue; |
2186 | } | |
8944b79f | 2187 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2188 | prev = sdata; |
571ecf67 | 2189 | } |
a4b7d7bd | 2190 | if (prev) |
8944b79f | 2191 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2192 | else |
8e6f0032 | 2193 | dev_kfree_skb(skb); |
571ecf67 | 2194 | } |
6368e4b1 | 2195 | |
b580781e RR |
2196 | #define SEQ_MODULO 0x1000 |
2197 | #define SEQ_MASK 0xfff | |
2198 | ||
2199 | static inline int seq_less(u16 sq1, u16 sq2) | |
2200 | { | |
c6a1fa12 | 2201 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2202 | } |
2203 | ||
2204 | static inline u16 seq_inc(u16 sq) | |
2205 | { | |
c6a1fa12 | 2206 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2207 | } |
2208 | ||
2209 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2210 | { | |
c6a1fa12 | 2211 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2212 | } |
2213 | ||
2214 | ||
2d3babd1 JM |
2215 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
2216 | struct tid_ampdu_rx *tid_agg_rx, | |
2217 | int index) | |
2218 | { | |
2219 | struct ieee80211_supported_band *sband; | |
2220 | struct ieee80211_rate *rate; | |
f1d58c25 JB |
2221 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
2222 | struct ieee80211_rx_status *status; | |
2d3babd1 | 2223 | |
f1d58c25 | 2224 | if (!skb) |
2d3babd1 JM |
2225 | goto no_frame; |
2226 | ||
f1d58c25 JB |
2227 | status = IEEE80211_SKB_RXCB(skb); |
2228 | ||
2d3babd1 | 2229 | /* release the reordered frames to stack */ |
f1d58c25 JB |
2230 | sband = hw->wiphy->bands[status->band]; |
2231 | if (status->flag & RX_FLAG_HT) | |
2d3babd1 JM |
2232 | rate = sband->bitrates; /* TODO: HT rates */ |
2233 | else | |
f1d58c25 JB |
2234 | rate = &sband->bitrates[status->rate_idx]; |
2235 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
2d3babd1 JM |
2236 | tid_agg_rx->stored_mpdu_num--; |
2237 | tid_agg_rx->reorder_buf[index] = NULL; | |
2238 | ||
2239 | no_frame: | |
2240 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2241 | } | |
2242 | ||
2243 | ||
4d050f1d JM |
2244 | /* |
2245 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
2246 | * the skb was added to the buffer longer than this time ago, the earlier | |
2247 | * frames that have not yet been received are assumed to be lost and the skb | |
2248 | * can be released for processing. This may also release other skb's from the | |
2249 | * reorder buffer if there are no additional gaps between the frames. | |
2250 | */ | |
2251 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
2252 | ||
71364716 RR |
2253 | /* |
2254 | * As it function blongs to Rx path it must be called with | |
2255 | * the proper rcu_read_lock protection for its flow. | |
2256 | */ | |
c6a1fa12 JB |
2257 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2258 | struct tid_ampdu_rx *tid_agg_rx, | |
2259 | struct sk_buff *skb, | |
2260 | u16 mpdu_seq_num, | |
2261 | int bar_req) | |
b580781e | 2262 | { |
b580781e RR |
2263 | u16 head_seq_num, buf_size; |
2264 | int index; | |
b580781e RR |
2265 | |
2266 | buf_size = tid_agg_rx->buf_size; | |
2267 | head_seq_num = tid_agg_rx->head_seq_num; | |
2268 | ||
2269 | /* frame with out of date sequence number */ | |
2270 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2271 | dev_kfree_skb(skb); | |
2272 | return 1; | |
2273 | } | |
2274 | ||
2275 | /* if frame sequence number exceeds our buffering window size or | |
2276 | * block Ack Request arrived - release stored frames */ | |
2277 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2278 | /* new head to the ordering buffer */ | |
2279 | if (bar_req) | |
2280 | head_seq_num = mpdu_seq_num; | |
2281 | else | |
2282 | head_seq_num = | |
2283 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2284 | /* release stored frames up to new head to stack */ | |
2285 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2286 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2287 | tid_agg_rx->ssn) | |
2288 | % tid_agg_rx->buf_size; | |
2d3babd1 JM |
2289 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
2290 | index); | |
b580781e RR |
2291 | } |
2292 | if (bar_req) | |
2293 | return 1; | |
2294 | } | |
2295 | ||
2296 | /* now the new frame is always in the range of the reordering */ | |
2297 | /* buffer window */ | |
2298 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2299 | % tid_agg_rx->buf_size; | |
2300 | /* check if we already stored this frame */ | |
2301 | if (tid_agg_rx->reorder_buf[index]) { | |
2302 | dev_kfree_skb(skb); | |
2303 | return 1; | |
2304 | } | |
2305 | ||
2306 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2307 | /* release it immediately */ | |
2308 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2309 | tid_agg_rx->stored_mpdu_num == 0) { | |
2310 | tid_agg_rx->head_seq_num = | |
2311 | seq_inc(tid_agg_rx->head_seq_num); | |
2312 | return 0; | |
2313 | } | |
2314 | ||
2315 | /* put the frame in the reordering buffer */ | |
2316 | tid_agg_rx->reorder_buf[index] = skb; | |
4d050f1d | 2317 | tid_agg_rx->reorder_time[index] = jiffies; |
b580781e RR |
2318 | tid_agg_rx->stored_mpdu_num++; |
2319 | /* release the buffer until next missing frame */ | |
2320 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2321 | % tid_agg_rx->buf_size; | |
4d050f1d JM |
2322 | if (!tid_agg_rx->reorder_buf[index] && |
2323 | tid_agg_rx->stored_mpdu_num > 1) { | |
2324 | /* | |
2325 | * No buffers ready to be released, but check whether any | |
2326 | * frames in the reorder buffer have timed out. | |
2327 | */ | |
2328 | int j; | |
2329 | int skipped = 1; | |
2330 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
2331 | j = (j + 1) % tid_agg_rx->buf_size) { | |
2332 | if (tid_agg_rx->reorder_buf[j] == NULL) { | |
2333 | skipped++; | |
2334 | continue; | |
2335 | } | |
2336 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
2337 | HZ / 10)) | |
2338 | break; | |
2339 | ||
2340 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
2341 | if (net_ratelimit()) | |
2342 | printk(KERN_DEBUG "%s: release an RX reorder " | |
2343 | "frame due to timeout on earlier " | |
2344 | "frames\n", | |
2345 | wiphy_name(hw->wiphy)); | |
2346 | #endif | |
2347 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); | |
2348 | ||
2349 | /* | |
2350 | * Increment the head seq# also for the skipped slots. | |
2351 | */ | |
2352 | tid_agg_rx->head_seq_num = | |
2353 | (tid_agg_rx->head_seq_num + skipped) & | |
2354 | SEQ_MASK; | |
2355 | skipped = 0; | |
2356 | } | |
2357 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2d3babd1 | 2358 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
b580781e RR |
2359 | index = seq_sub(tid_agg_rx->head_seq_num, |
2360 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2361 | } | |
2362 | return 1; | |
2363 | } | |
2364 | ||
71ebb4aa | 2365 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
f1d58c25 | 2366 | struct sk_buff *skb) |
b580781e RR |
2367 | { |
2368 | struct ieee80211_hw *hw = &local->hw; | |
2369 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2370 | struct sta_info *sta; | |
2371 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2372 | u16 sc; |
b580781e | 2373 | u16 mpdu_seq_num; |
182503ab | 2374 | u8 ret = 0; |
b580781e RR |
2375 | int tid; |
2376 | ||
2377 | sta = sta_info_get(local, hdr->addr2); | |
2378 | if (!sta) | |
2379 | return ret; | |
2380 | ||
b580781e RR |
2381 | /* filter the QoS data rx stream according to |
2382 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2383 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2384 | goto end_reorder; |
2385 | ||
238f74a2 | 2386 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2387 | |
cee24a3e | 2388 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2389 | goto end_reorder; |
2390 | ||
cee24a3e RR |
2391 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2392 | ||
2560b6e2 EG |
2393 | /* qos null data frames are excluded */ |
2394 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2395 | goto end_reorder; |
2396 | ||
2397 | /* new un-ordered ampdu frame - process it */ | |
2398 | ||
2399 | /* reset session timer */ | |
20ad19d0 JB |
2400 | if (tid_agg_rx->timeout) |
2401 | mod_timer(&tid_agg_rx->session_timer, | |
2402 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2403 | |
2404 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2405 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2406 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2407 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2408 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2409 | ret = 1; | |
2410 | goto end_reorder; | |
2411 | } | |
2412 | ||
2413 | /* according to mpdu sequence number deal with reordering buffer */ | |
2414 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
f1d58c25 | 2415 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, |
b580781e | 2416 | mpdu_seq_num, 0); |
d0709a65 | 2417 | end_reorder: |
b580781e RR |
2418 | return ret; |
2419 | } | |
2420 | ||
6368e4b1 RR |
2421 | /* |
2422 | * This is the receive path handler. It is called by a low level driver when an | |
2423 | * 802.11 MPDU is received from the hardware. | |
2424 | */ | |
f1d58c25 | 2425 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
6368e4b1 RR |
2426 | { |
2427 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2428 | struct ieee80211_rate *rate = NULL; |
2429 | struct ieee80211_supported_band *sband; | |
f1d58c25 | 2430 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
8318d78a JB |
2431 | |
2432 | if (status->band < 0 || | |
13d8fd2d | 2433 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2434 | WARN_ON(1); |
2435 | return; | |
2436 | } | |
2437 | ||
2438 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2439 | if (!sband) { |
8318d78a JB |
2440 | WARN_ON(1); |
2441 | return; | |
2442 | } | |
2443 | ||
0fb8ca45 JM |
2444 | if (status->flag & RX_FLAG_HT) { |
2445 | /* rate_idx is MCS index */ | |
2446 | if (WARN_ON(status->rate_idx < 0 || | |
2447 | status->rate_idx >= 76)) | |
2448 | return; | |
2449 | /* HT rates are not in the table - use the highest legacy rate | |
2450 | * for now since other parts of mac80211 may not yet be fully | |
2451 | * MCS aware. */ | |
2452 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2453 | } else { | |
2454 | if (WARN_ON(status->rate_idx < 0 || | |
2455 | status->rate_idx >= sband->n_bitrates)) | |
2456 | return; | |
2457 | rate = &sband->bitrates[status->rate_idx]; | |
2458 | } | |
6368e4b1 RR |
2459 | |
2460 | /* | |
2461 | * key references and virtual interfaces are protected using RCU | |
2462 | * and this requires that we are in a read-side RCU section during | |
2463 | * receive processing | |
2464 | */ | |
2465 | rcu_read_lock(); | |
2466 | ||
2467 | /* | |
2468 | * Frames with failed FCS/PLCP checksum are not returned, | |
2469 | * all other frames are returned without radiotap header | |
2470 | * if it was previously present. | |
2471 | * Also, frames with less than 16 bytes are dropped. | |
2472 | */ | |
f1d58c25 | 2473 | skb = ieee80211_rx_monitor(local, skb, rate); |
6368e4b1 RR |
2474 | if (!skb) { |
2475 | rcu_read_unlock(); | |
2476 | return; | |
2477 | } | |
2478 | ||
aec67952 JM |
2479 | /* |
2480 | * In theory, the block ack reordering should happen after duplicate | |
2481 | * removal (ieee80211_rx_h_check(), which is an RX handler). As such, | |
2482 | * the call to ieee80211_rx_reorder_ampdu() should really be moved to | |
2483 | * happen as a new RX handler between ieee80211_rx_h_check and | |
2484 | * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for | |
2485 | * the time being, the call can be here since RX reorder buf processing | |
2486 | * will implicitly skip duplicates. We could, in theory at least, | |
2487 | * process frames that ieee80211_rx_h_passive_scan would drop (e.g., | |
2488 | * frames from other than operational channel), but that should not | |
2489 | * happen in normal networks. | |
2490 | */ | |
f1d58c25 JB |
2491 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
2492 | __ieee80211_rx_handle_packet(hw, skb, rate); | |
6368e4b1 RR |
2493 | |
2494 | rcu_read_unlock(); | |
2495 | } | |
571ecf67 JB |
2496 | EXPORT_SYMBOL(__ieee80211_rx); |
2497 | ||
2498 | /* This is a version of the rx handler that can be called from hard irq | |
2499 | * context. Post the skb on the queue and schedule the tasklet */ | |
f1d58c25 | 2500 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
571ecf67 JB |
2501 | { |
2502 | struct ieee80211_local *local = hw_to_local(hw); | |
2503 | ||
2504 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2505 | ||
571ecf67 JB |
2506 | skb->pkt_type = IEEE80211_RX_MSG; |
2507 | skb_queue_tail(&local->skb_queue, skb); | |
2508 | tasklet_schedule(&local->tasklet); | |
2509 | } | |
2510 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |