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Commit | Line | Data |
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571ecf67 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
ab46623e | 12 | #include <linux/jiffies.h> |
571ecf67 JB |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
571ecf67 JB |
18 | #include <net/mac80211.h> |
19 | #include <net/ieee80211_radiotap.h> | |
20 | ||
21 | #include "ieee80211_i.h" | |
2c8dccc7 | 22 | #include "led.h" |
33b64eb2 | 23 | #include "mesh.h" |
571ecf67 JB |
24 | #include "wep.h" |
25 | #include "wpa.h" | |
26 | #include "tkip.h" | |
27 | #include "wme.h" | |
28 | ||
c6a1fa12 JB |
29 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
30 | struct tid_ampdu_rx *tid_agg_rx, | |
31 | struct sk_buff *skb, | |
32 | u16 mpdu_seq_num, | |
33 | int bar_req); | |
b2e7771e JB |
34 | /* |
35 | * monitor mode reception | |
36 | * | |
37 | * This function cleans up the SKB, i.e. it removes all the stuff | |
38 | * only useful for monitoring. | |
39 | */ | |
40 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
41 | struct sk_buff *skb, | |
42 | int rtap_len) | |
43 | { | |
44 | skb_pull(skb, rtap_len); | |
45 | ||
46 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
47 | if (likely(skb->len > FCS_LEN)) | |
48 | skb_trim(skb, skb->len - FCS_LEN); | |
49 | else { | |
50 | /* driver bug */ | |
51 | WARN_ON(1); | |
52 | dev_kfree_skb(skb); | |
53 | skb = NULL; | |
54 | } | |
55 | } | |
56 | ||
57 | return skb; | |
58 | } | |
59 | ||
60 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
61 | struct sk_buff *skb, | |
62 | int present_fcs_len, | |
63 | int radiotap_len) | |
64 | { | |
182503ab | 65 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
66 | |
67 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
68 | return 1; | |
69 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
70 | return 1; | |
87228f57 HH |
71 | if (ieee80211_is_ctl(hdr->frame_control) && |
72 | !ieee80211_is_pspoll(hdr->frame_control) && | |
73 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
74 | return 1; |
75 | return 0; | |
76 | } | |
77 | ||
601ae7f2 BR |
78 | static int |
79 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
80 | struct ieee80211_rx_status *status) | |
81 | { | |
82 | int len; | |
83 | ||
84 | /* always present fields */ | |
85 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
86 | ||
87 | if (status->flag & RX_FLAG_TSFT) | |
88 | len += 8; | |
89 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB || | |
90 | local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
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, | |
113 | struct ieee80211_rx_status *status, | |
114 | struct ieee80211_rate *rate, | |
115 | int rtap_len) | |
116 | { | |
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; | |
b4f28bbb BR |
146 | if (status->flag & RX_FLAG_SHORTPRE) |
147 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
148 | pos++; |
149 | ||
150 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
151 | if (status->flag & RX_FLAG_HT) { |
152 | /* | |
153 | * TODO: add following information into radiotap header once | |
154 | * suitable fields are defined for it: | |
155 | * - MCS index (status->rate_idx) | |
156 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
157 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
158 | */ | |
159 | *pos = 0; | |
8d6f658e JM |
160 | } else { |
161 | rthdr->it_present |= (1 << IEEE80211_RADIOTAP_RATE); | |
0fb8ca45 | 162 | *pos = rate->bitrate / 5; |
8d6f658e | 163 | } |
601ae7f2 BR |
164 | pos++; |
165 | ||
166 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
167 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
168 | pos += 2; | |
169 | if (status->band == IEEE80211_BAND_5GHZ) | |
170 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
171 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
172 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
173 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
174 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 175 | else |
9deb1ae5 | 176 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
177 | IEEE80211_CHAN_2GHZ); |
178 | pos += 2; | |
179 | ||
180 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
181 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
182 | *pos = status->signal; | |
183 | rthdr->it_present |= | |
184 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
185 | pos++; | |
186 | } | |
187 | ||
188 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
189 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
190 | *pos = status->noise; | |
191 | rthdr->it_present |= | |
192 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
193 | pos++; | |
194 | } | |
195 | ||
196 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
197 | ||
198 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
199 | *pos = status->antenna; | |
200 | pos++; | |
201 | ||
202 | /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */ | |
203 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) { | |
204 | *pos = status->signal; | |
205 | rthdr->it_present |= | |
206 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL); | |
207 | pos++; | |
208 | } | |
209 | ||
210 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
211 | ||
212 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
213 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
214 | if ((pos - (unsigned char *)rthdr) & 1) | |
215 | pos++; | |
216 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
217 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
218 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
219 | pos += 2; | |
220 | } | |
221 | ||
b2e7771e JB |
222 | /* |
223 | * This function copies a received frame to all monitor interfaces and | |
224 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
225 | * radiotap header the driver might have added. | |
226 | */ | |
227 | static struct sk_buff * | |
228 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
229 | struct ieee80211_rx_status *status, |
230 | struct ieee80211_rate *rate) | |
b2e7771e JB |
231 | { |
232 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 233 | int needed_headroom = 0; |
b2e7771e JB |
234 | struct sk_buff *skb, *skb2; |
235 | struct net_device *prev_dev = NULL; | |
236 | int present_fcs_len = 0; | |
237 | int rtap_len = 0; | |
238 | ||
239 | /* | |
240 | * First, we may need to make a copy of the skb because | |
241 | * (1) we need to modify it for radiotap (if not present), and | |
242 | * (2) the other RX handlers will modify the skb we got. | |
243 | * | |
244 | * We don't need to, of course, if we aren't going to return | |
245 | * the SKB because it has a bad FCS/PLCP checksum. | |
246 | */ | |
247 | if (status->flag & RX_FLAG_RADIOTAP) | |
248 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
249 | else | |
601ae7f2 BR |
250 | /* room for the radiotap header based on driver features */ |
251 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
252 | |
253 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
254 | present_fcs_len = FCS_LEN; | |
255 | ||
256 | if (!local->monitors) { | |
257 | if (should_drop_frame(status, origskb, present_fcs_len, | |
258 | rtap_len)) { | |
259 | dev_kfree_skb(origskb); | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | return remove_monitor_info(local, origskb, rtap_len); | |
264 | } | |
265 | ||
266 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
267 | /* only need to expand headroom if necessary */ | |
268 | skb = origskb; | |
269 | origskb = NULL; | |
270 | ||
271 | /* | |
272 | * This shouldn't trigger often because most devices have an | |
273 | * RX header they pull before we get here, and that should | |
274 | * be big enough for our radiotap information. We should | |
275 | * probably export the length to drivers so that we can have | |
276 | * them allocate enough headroom to start with. | |
277 | */ | |
278 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 279 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
280 | dev_kfree_skb(skb); |
281 | return NULL; | |
282 | } | |
283 | } else { | |
284 | /* | |
285 | * Need to make a copy and possibly remove radiotap header | |
286 | * and FCS from the original. | |
287 | */ | |
288 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
289 | ||
290 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
291 | ||
292 | if (!skb) | |
293 | return origskb; | |
294 | } | |
295 | ||
296 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
297 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
298 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
299 | needed_headroom); | |
b2e7771e | 300 | |
ce3edf6d | 301 | skb_reset_mac_header(skb); |
b2e7771e JB |
302 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
303 | skb->pkt_type = PACKET_OTHERHOST; | |
304 | skb->protocol = htons(ETH_P_802_2); | |
305 | ||
306 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
307 | if (!netif_running(sdata->dev)) | |
308 | continue; | |
309 | ||
05c914fe | 310 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
311 | continue; |
312 | ||
3d30d949 MW |
313 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
314 | continue; | |
315 | ||
b2e7771e JB |
316 | if (prev_dev) { |
317 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
318 | if (skb2) { | |
319 | skb2->dev = prev_dev; | |
320 | netif_rx(skb2); | |
321 | } | |
322 | } | |
323 | ||
324 | prev_dev = sdata->dev; | |
325 | sdata->dev->stats.rx_packets++; | |
326 | sdata->dev->stats.rx_bytes += skb->len; | |
327 | } | |
328 | ||
329 | if (prev_dev) { | |
330 | skb->dev = prev_dev; | |
331 | netif_rx(skb); | |
332 | } else | |
333 | dev_kfree_skb(skb); | |
334 | ||
335 | return origskb; | |
336 | } | |
337 | ||
338 | ||
5cf121c3 | 339 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 340 | { |
238f74a2 | 341 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
342 | int tid; |
343 | ||
344 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
345 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
346 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 347 | /* frame has qos control */ |
238f74a2 HH |
348 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
349 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 350 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 351 | else |
5cf121c3 | 352 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 353 | } else { |
1411f9b5 JB |
354 | /* |
355 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
356 | * | |
357 | * Sequence numbers for management frames, QoS data | |
358 | * frames with a broadcast/multicast address in the | |
359 | * Address 1 field, and all non-QoS data frames sent | |
360 | * by QoS STAs are assigned using an additional single | |
361 | * modulo-4096 counter, [...] | |
362 | * | |
363 | * We also use that counter for non-QoS STAs. | |
364 | */ | |
365 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 366 | } |
52865dfd | 367 | |
5cf121c3 | 368 | rx->queue = tid; |
6e0d114d JB |
369 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
370 | * For now, set skb->priority to 0 for other cases. */ | |
371 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 372 | } |
6e0d114d | 373 | |
d1c3a37c JB |
374 | /** |
375 | * DOC: Packet alignment | |
376 | * | |
377 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
378 | * to the stack. | |
379 | * | |
380 | * Additionally, should, if possible, align the payload data in a way that | |
381 | * guarantees that the contained IP header is aligned to a four-byte | |
382 | * boundary. In the case of regular frames, this simply means aligning the | |
383 | * payload to a four-byte boundary (because either the IP header is directly | |
384 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
385 | * in front of it). | |
386 | * | |
387 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
388 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
389 | * push the IP header further back to a multiple of four again. Thankfully, the | |
390 | * specs were sane enough this time around to require padding each A-MSDU | |
391 | * subframe to a length that is a multiple of four. | |
392 | * | |
393 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
394 | * the payload is not supported, the driver is required to move the 802.11 | |
395 | * header to be directly in front of the payload in that case. | |
396 | */ | |
397 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 398 | { |
a7767f95 | 399 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
400 | int hdrlen; |
401 | ||
d1c3a37c JB |
402 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
403 | return; | |
404 | #endif | |
405 | ||
406 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
407 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
408 | return; | |
409 | ||
a7767f95 | 410 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
411 | return; |
412 | ||
a7767f95 | 413 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 414 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 415 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
416 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
417 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
418 | } |
419 | ||
6368e4b1 | 420 | |
571ecf67 JB |
421 | /* rx handlers */ |
422 | ||
49461622 | 423 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 424 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
425 | { |
426 | struct ieee80211_local *local = rx->local; | |
427 | struct sk_buff *skb = rx->skb; | |
428 | ||
c2b13452 JB |
429 | if (unlikely(local->hw_scanning)) |
430 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 431 | |
c2b13452 | 432 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 433 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 434 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 435 | != RX_QUEUED) |
ece8eddd | 436 | dev_kfree_skb(skb); |
9ae54c84 | 437 | return RX_QUEUED; |
571ecf67 JB |
438 | } |
439 | ||
5cf121c3 | 440 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
441 | /* scanning finished during invoking of handlers */ |
442 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 443 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
444 | } |
445 | ||
9ae54c84 | 446 | return RX_CONTINUE; |
571ecf67 JB |
447 | } |
448 | ||
33b64eb2 | 449 | static ieee80211_rx_result |
5cf121c3 | 450 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 451 | { |
a7767f95 HH |
452 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
453 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 454 | |
a7767f95 HH |
455 | if (ieee80211_is_data(hdr->frame_control)) { |
456 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
457 | return RX_DROP_MONITOR; |
458 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
459 | return RX_DROP_MONITOR; | |
460 | } | |
461 | ||
462 | /* If there is not an established peer link and this is not a peer link | |
463 | * establisment frame, beacon or probe, drop the frame. | |
464 | */ | |
465 | ||
b4e08ea1 | 466 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 467 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 468 | |
a7767f95 | 469 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
470 | return RX_DROP_MONITOR; |
471 | ||
a7767f95 | 472 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
473 | mgmt = (struct ieee80211_mgmt *)hdr; |
474 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
475 | return RX_DROP_MONITOR; | |
33b64eb2 | 476 | return RX_CONTINUE; |
33b64eb2 LCC |
477 | } |
478 | ||
a7767f95 HH |
479 | if (ieee80211_is_probe_req(hdr->frame_control) || |
480 | ieee80211_is_probe_resp(hdr->frame_control) || | |
481 | ieee80211_is_beacon(hdr->frame_control)) | |
482 | return RX_CONTINUE; | |
483 | ||
484 | return RX_DROP_MONITOR; | |
485 | ||
486 | } | |
487 | ||
488 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
489 | ||
490 | if (ieee80211_is_data(hdr->frame_control) && | |
491 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 492 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 493 | return RX_DROP_MONITOR; |
902acc78 | 494 | #undef msh_h_get |
d6d1a5a7 | 495 | |
902acc78 JB |
496 | return RX_CONTINUE; |
497 | } | |
33b64eb2 LCC |
498 | |
499 | ||
49461622 | 500 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 501 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 502 | { |
a7767f95 | 503 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
504 | |
505 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
506 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 507 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 508 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 509 | hdr->seq_ctrl)) { |
5cf121c3 | 510 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
511 | rx->local->dot11FrameDuplicateCount++; |
512 | rx->sta->num_duplicates++; | |
513 | } | |
e4c26add | 514 | return RX_DROP_MONITOR; |
571ecf67 | 515 | } else |
5cf121c3 | 516 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
517 | } |
518 | ||
571ecf67 JB |
519 | if (unlikely(rx->skb->len < 16)) { |
520 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 521 | return RX_DROP_MONITOR; |
571ecf67 JB |
522 | } |
523 | ||
571ecf67 JB |
524 | /* Drop disallowed frame classes based on STA auth/assoc state; |
525 | * IEEE 802.11, Chap 5.5. | |
526 | * | |
ccd7b362 JB |
527 | * mac80211 filters only based on association state, i.e. it drops |
528 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
529 | * deauth/disassoc frames when needed. In addition, hostapd is |
530 | * responsible for filtering on both auth and assoc states. | |
531 | */ | |
33b64eb2 | 532 | |
902acc78 | 533 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 534 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 535 | |
a7767f95 HH |
536 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
537 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 538 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 539 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
540 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
541 | !ieee80211_has_tods(hdr->frame_control) && | |
542 | ieee80211_is_data(hdr->frame_control)) || | |
543 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
544 | /* Drop IBSS frames and frames for other hosts |
545 | * silently. */ | |
e4c26add | 546 | return RX_DROP_MONITOR; |
571ecf67 JB |
547 | } |
548 | ||
e4c26add | 549 | return RX_DROP_MONITOR; |
571ecf67 JB |
550 | } |
551 | ||
9ae54c84 | 552 | return RX_CONTINUE; |
570bd537 JB |
553 | } |
554 | ||
555 | ||
49461622 | 556 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 557 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 558 | { |
a7767f95 | 559 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
560 | int keyidx; |
561 | int hdrlen; | |
e4c26add | 562 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 563 | struct ieee80211_key *stakey = NULL; |
570bd537 | 564 | |
3017b80b JB |
565 | /* |
566 | * Key selection 101 | |
567 | * | |
568 | * There are three types of keys: | |
569 | * - GTK (group keys) | |
570 | * - PTK (pairwise keys) | |
571 | * - STK (station-to-station pairwise keys) | |
572 | * | |
573 | * When selecting a key, we have to distinguish between multicast | |
574 | * (including broadcast) and unicast frames, the latter can only | |
575 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
576 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
577 | * frames can also use key indizes like GTKs. Hence, if we don't | |
578 | * have a PTK/STK we check the key index for a WEP key. | |
579 | * | |
8dc06a1c JB |
580 | * Note that in a regular BSS, multicast frames are sent by the |
581 | * AP only, associated stations unicast the frame to the AP first | |
582 | * which then multicasts it on their behalf. | |
583 | * | |
3017b80b JB |
584 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
585 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
586 | * The spec seems to expect that one negotiates the same key with |
587 | * every station but there's no such requirement; VLANs could be | |
588 | * possible. | |
3017b80b JB |
589 | */ |
590 | ||
a7767f95 | 591 | if (!ieee80211_has_protected(hdr->frame_control)) |
9ae54c84 | 592 | return RX_CONTINUE; |
571ecf67 | 593 | |
3017b80b | 594 | /* |
1990af8d | 595 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
596 | * addressed to us nor a multicast frame. |
597 | */ | |
5cf121c3 | 598 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 599 | return RX_CONTINUE; |
3017b80b | 600 | |
d4e46a3d JB |
601 | if (rx->sta) |
602 | stakey = rcu_dereference(rx->sta->key); | |
603 | ||
604 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
605 | rx->key = stakey; | |
571ecf67 | 606 | } else { |
3017b80b JB |
607 | /* |
608 | * The device doesn't give us the IV so we won't be | |
609 | * able to look up the key. That's ok though, we | |
610 | * don't need to decrypt the frame, we just won't | |
611 | * be able to keep statistics accurate. | |
612 | * Except for key threshold notifications, should | |
613 | * we somehow allow the driver to tell us which key | |
614 | * the hardware used if this flag is set? | |
615 | */ | |
5cf121c3 JB |
616 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
617 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 618 | return RX_CONTINUE; |
3017b80b | 619 | |
a7767f95 | 620 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
621 | |
622 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 623 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
624 | |
625 | /* | |
626 | * no need to call ieee80211_wep_get_keyidx, | |
627 | * it verifies a bunch of things we've done already | |
628 | */ | |
629 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
630 | ||
d4e46a3d | 631 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
632 | |
633 | /* | |
634 | * RSNA-protected unicast frames should always be sent with | |
635 | * pairwise or station-to-station keys, but for WEP we allow | |
636 | * using a key index as well. | |
637 | */ | |
8f20fc24 | 638 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
639 | !is_multicast_ether_addr(hdr->addr1)) |
640 | rx->key = NULL; | |
571ecf67 JB |
641 | } |
642 | ||
3017b80b | 643 | if (rx->key) { |
571ecf67 | 644 | rx->key->tx_rx_count++; |
011bfcc4 | 645 | /* TODO: add threshold stuff again */ |
1990af8d | 646 | } else { |
e4c26add | 647 | return RX_DROP_MONITOR; |
70f08765 JB |
648 | } |
649 | ||
1990af8d JB |
650 | /* Check for weak IVs if possible */ |
651 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 652 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
653 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
654 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
655 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
656 | rx->sta->wep_weak_iv_count++; | |
657 | ||
70f08765 JB |
658 | switch (rx->key->conf.alg) { |
659 | case ALG_WEP: | |
e2f036da MN |
660 | result = ieee80211_crypto_wep_decrypt(rx); |
661 | break; | |
70f08765 | 662 | case ALG_TKIP: |
e2f036da MN |
663 | result = ieee80211_crypto_tkip_decrypt(rx); |
664 | break; | |
70f08765 | 665 | case ALG_CCMP: |
e2f036da MN |
666 | result = ieee80211_crypto_ccmp_decrypt(rx); |
667 | break; | |
70f08765 JB |
668 | } |
669 | ||
e2f036da | 670 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 671 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
672 | |
673 | return result; | |
70f08765 JB |
674 | } |
675 | ||
133b8226 | 676 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 677 | { |
133b8226 | 678 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 679 | struct ieee80211_local *local = sdata->local; |
0795af57 | 680 | |
3e122be0 | 681 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 682 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
89fad578 CL |
683 | if (local->ops->sta_notify) |
684 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
685 | STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 686 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
687 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
688 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
689 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
690 | } | |
691 | ||
133b8226 | 692 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 693 | { |
133b8226 JB |
694 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
695 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
696 | struct sk_buff *skb; |
697 | int sent = 0; | |
571ecf67 | 698 | |
3e122be0 | 699 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 700 | |
07346f81 | 701 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
89fad578 CL |
702 | if (local->ops->sta_notify) |
703 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
704 | STA_NOTIFY_AWAKE, &sta->sta); | |
004c872e JB |
705 | |
706 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
707 | sta_info_clear_tim_bit(sta); | |
708 | ||
571ecf67 | 709 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
710 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
711 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 712 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 713 | |
571ecf67 JB |
714 | /* Send all buffered frames to the station */ |
715 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 716 | sent++; |
8b30b1fe | 717 | skb->requeue = 1; |
571ecf67 JB |
718 | dev_queue_xmit(skb); |
719 | } | |
720 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
721 | local->total_ps_buffered--; |
722 | sent++; | |
723 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 724 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 725 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 726 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 727 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 728 | skb->requeue = 1; |
571ecf67 JB |
729 | dev_queue_xmit(skb); |
730 | } | |
731 | ||
732 | return sent; | |
733 | } | |
734 | ||
49461622 | 735 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 736 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
737 | { |
738 | struct sta_info *sta = rx->sta; | |
a7767f95 | 739 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
740 | |
741 | if (!sta) | |
9ae54c84 | 742 | return RX_CONTINUE; |
571ecf67 JB |
743 | |
744 | /* Update last_rx only for IBSS packets which are for the current | |
745 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
746 | * other STAs are using different BSSID. */ | |
05c914fe | 747 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 748 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 749 | NL80211_IFTYPE_ADHOC); |
571ecf67 JB |
750 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
751 | sta->last_rx = jiffies; | |
752 | } else | |
753 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 754 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
755 | /* Update last_rx only for unicast frames in order to prevent |
756 | * the Probe Request frames (the only broadcast frames from a | |
757 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
758 | * Mesh beacons will update last_rx when if they are found to |
759 | * match the current local configuration when processed. | |
571ecf67 JB |
760 | */ |
761 | sta->last_rx = jiffies; | |
762 | } | |
763 | ||
5cf121c3 | 764 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 765 | return RX_CONTINUE; |
571ecf67 JB |
766 | |
767 | sta->rx_fragments++; | |
768 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 769 | sta->last_signal = rx->status->signal; |
566bfe5a | 770 | sta->last_qual = rx->status->qual; |
5cf121c3 | 771 | sta->last_noise = rx->status->noise; |
571ecf67 | 772 | |
72eaa43a JB |
773 | /* |
774 | * Change STA power saving mode only at the end of a frame | |
775 | * exchange sequence. | |
776 | */ | |
3e122be0 | 777 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
778 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
779 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
780 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
781 | /* | |
782 | * Ignore doze->wake transitions that are | |
783 | * indicated by non-data frames, the standard | |
784 | * is unclear here, but for example going to | |
785 | * PS mode and then scanning would cause a | |
786 | * doze->wake transition for the probe request, | |
787 | * and that is clearly undesirable. | |
788 | */ | |
789 | if (ieee80211_is_data(hdr->frame_control) && | |
790 | !ieee80211_has_pm(hdr->frame_control)) | |
791 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
792 | } else { | |
793 | if (ieee80211_has_pm(hdr->frame_control)) | |
794 | ap_sta_ps_start(sta); | |
795 | } | |
571ecf67 JB |
796 | } |
797 | ||
798 | /* Drop data::nullfunc frames silently, since they are used only to | |
799 | * control station power saving mode. */ | |
a7767f95 | 800 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
801 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
802 | /* Update counter and free packet here to avoid counting this | |
803 | * as a dropped packed. */ | |
804 | sta->rx_packets++; | |
805 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 806 | return RX_QUEUED; |
571ecf67 JB |
807 | } |
808 | ||
9ae54c84 | 809 | return RX_CONTINUE; |
571ecf67 JB |
810 | } /* ieee80211_rx_h_sta_process */ |
811 | ||
571ecf67 JB |
812 | static inline struct ieee80211_fragment_entry * |
813 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
814 | unsigned int frag, unsigned int seq, int rx_queue, | |
815 | struct sk_buff **skb) | |
816 | { | |
817 | struct ieee80211_fragment_entry *entry; | |
818 | int idx; | |
819 | ||
820 | idx = sdata->fragment_next; | |
821 | entry = &sdata->fragments[sdata->fragment_next++]; | |
822 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
823 | sdata->fragment_next = 0; | |
824 | ||
825 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 826 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
827 | struct ieee80211_hdr *hdr = |
828 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
829 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
830 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 831 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
832 | sdata->dev->name, idx, |
833 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 834 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 835 | #endif |
571ecf67 JB |
836 | __skb_queue_purge(&entry->skb_list); |
837 | } | |
838 | ||
839 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
840 | *skb = NULL; | |
841 | entry->first_frag_time = jiffies; | |
842 | entry->seq = seq; | |
843 | entry->rx_queue = rx_queue; | |
844 | entry->last_frag = frag; | |
845 | entry->ccmp = 0; | |
846 | entry->extra_len = 0; | |
847 | ||
848 | return entry; | |
849 | } | |
850 | ||
851 | static inline struct ieee80211_fragment_entry * | |
852 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 853 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
854 | int rx_queue, struct ieee80211_hdr *hdr) |
855 | { | |
856 | struct ieee80211_fragment_entry *entry; | |
857 | int i, idx; | |
858 | ||
859 | idx = sdata->fragment_next; | |
860 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
861 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
862 | |
863 | idx--; | |
864 | if (idx < 0) | |
865 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
866 | ||
867 | entry = &sdata->fragments[idx]; | |
868 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
869 | entry->rx_queue != rx_queue || | |
870 | entry->last_frag + 1 != frag) | |
871 | continue; | |
872 | ||
b73d70ad | 873 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 874 | |
b73d70ad HH |
875 | /* |
876 | * Check ftype and addresses are equal, else check next fragment | |
877 | */ | |
878 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
879 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
880 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
881 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
882 | continue; | |
883 | ||
ab46623e | 884 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
885 | __skb_queue_purge(&entry->skb_list); |
886 | continue; | |
887 | } | |
888 | return entry; | |
889 | } | |
890 | ||
891 | return NULL; | |
892 | } | |
893 | ||
49461622 | 894 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 895 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
896 | { |
897 | struct ieee80211_hdr *hdr; | |
898 | u16 sc; | |
358c8d9d | 899 | __le16 fc; |
571ecf67 JB |
900 | unsigned int frag, seq; |
901 | struct ieee80211_fragment_entry *entry; | |
902 | struct sk_buff *skb; | |
903 | ||
b73d70ad | 904 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 905 | fc = hdr->frame_control; |
571ecf67 JB |
906 | sc = le16_to_cpu(hdr->seq_ctrl); |
907 | frag = sc & IEEE80211_SCTL_FRAG; | |
908 | ||
358c8d9d | 909 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
910 | (rx->skb)->len < 24 || |
911 | is_multicast_ether_addr(hdr->addr1))) { | |
912 | /* not fragmented */ | |
913 | goto out; | |
914 | } | |
915 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
916 | ||
917 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
918 | ||
919 | if (frag == 0) { | |
920 | /* This is the first fragment of a new frame. */ | |
921 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 922 | rx->queue, &(rx->skb)); |
8f20fc24 | 923 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 924 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
925 | /* Store CCMP PN so that we can verify that the next |
926 | * fragment has a sequential PN value. */ | |
927 | entry->ccmp = 1; | |
928 | memcpy(entry->last_pn, | |
5cf121c3 | 929 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
930 | CCMP_PN_LEN); |
931 | } | |
9ae54c84 | 932 | return RX_QUEUED; |
571ecf67 JB |
933 | } |
934 | ||
935 | /* This is a fragment for a frame that should already be pending in | |
936 | * fragment cache. Add this fragment to the end of the pending entry. | |
937 | */ | |
b73d70ad | 938 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
939 | if (!entry) { |
940 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 941 | return RX_DROP_MONITOR; |
571ecf67 JB |
942 | } |
943 | ||
944 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
945 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
946 | if (entry->ccmp) { | |
947 | int i; | |
948 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 949 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 950 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
951 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
952 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
953 | pn[i]++; | |
954 | if (pn[i]) | |
955 | break; | |
956 | } | |
5cf121c3 | 957 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 958 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 959 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
960 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
961 | } | |
962 | ||
358c8d9d | 963 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
964 | __skb_queue_tail(&entry->skb_list, rx->skb); |
965 | entry->last_frag = frag; | |
966 | entry->extra_len += rx->skb->len; | |
358c8d9d | 967 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 968 | rx->skb = NULL; |
9ae54c84 | 969 | return RX_QUEUED; |
571ecf67 JB |
970 | } |
971 | ||
972 | rx->skb = __skb_dequeue(&entry->skb_list); | |
973 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
974 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
975 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
976 | GFP_ATOMIC))) { | |
977 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
978 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 979 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
980 | } |
981 | } | |
982 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
983 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
984 | dev_kfree_skb(skb); | |
985 | } | |
986 | ||
987 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 988 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
989 | |
990 | out: | |
991 | if (rx->sta) | |
992 | rx->sta->rx_packets++; | |
993 | if (is_multicast_ether_addr(hdr->addr1)) | |
994 | rx->local->dot11MulticastReceivedFrameCount++; | |
995 | else | |
996 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 997 | return RX_CONTINUE; |
571ecf67 JB |
998 | } |
999 | ||
49461622 | 1000 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1001 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1002 | { |
98f0b0a3 | 1003 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1004 | struct sk_buff *skb; |
1005 | int no_pending_pkts; | |
358c8d9d | 1006 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1007 | |
358c8d9d | 1008 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1009 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1010 | return RX_CONTINUE; |
571ecf67 | 1011 | |
05c914fe JB |
1012 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1013 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1014 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1015 | |
571ecf67 JB |
1016 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1017 | if (!skb) { | |
1018 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1019 | if (skb) | |
1020 | rx->local->total_ps_buffered--; | |
1021 | } | |
1022 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1023 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1024 | ||
1025 | if (skb) { | |
1026 | struct ieee80211_hdr *hdr = | |
1027 | (struct ieee80211_hdr *) skb->data; | |
1028 | ||
4a9a66e9 JB |
1029 | /* |
1030 | * Tell TX path to send one frame even though the STA may | |
1031 | * still remain is PS mode after this frame exchange. | |
1032 | */ | |
07346f81 | 1033 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1034 | |
1035 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1036 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1037 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1038 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1039 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1040 | ||
1041 | /* Use MoreData flag to indicate whether there are more | |
1042 | * buffered frames for this STA */ | |
836341a7 | 1043 | if (no_pending_pkts) |
571ecf67 | 1044 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1045 | else |
571ecf67 JB |
1046 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1047 | ||
1048 | dev_queue_xmit(skb); | |
1049 | ||
004c872e JB |
1050 | if (no_pending_pkts) |
1051 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1052 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1053 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1054 | /* |
1055 | * FIXME: This can be the result of a race condition between | |
1056 | * us expiring a frame and the station polling for it. | |
1057 | * Should we send it a null-func frame indicating we | |
1058 | * have nothing buffered for it? | |
1059 | */ | |
0c68ae26 | 1060 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1061 | "though there are no buffered frames for it\n", |
0c68ae26 | 1062 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1063 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1064 | } |
1065 | ||
9ae54c84 | 1066 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1067 | * count as an dropped frame. */ |
1068 | dev_kfree_skb(rx->skb); | |
1069 | ||
9ae54c84 | 1070 | return RX_QUEUED; |
571ecf67 JB |
1071 | } |
1072 | ||
49461622 | 1073 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1074 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1075 | { |
6e0d114d | 1076 | u8 *data = rx->skb->data; |
238f74a2 | 1077 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1078 | |
238f74a2 | 1079 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1080 | return RX_CONTINUE; |
6e0d114d JB |
1081 | |
1082 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1083 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1084 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1085 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1086 | /* change frame type to non QOS */ |
238f74a2 | 1087 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1088 | |
9ae54c84 | 1089 | return RX_CONTINUE; |
6e0d114d JB |
1090 | } |
1091 | ||
76ee65bf | 1092 | static int |
5cf121c3 | 1093 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1094 | { |
07346f81 | 1095 | if (unlikely(!rx->sta || |
f4ea83dd | 1096 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1097 | return -EACCES; |
571ecf67 | 1098 | |
76ee65bf | 1099 | return 0; |
571ecf67 JB |
1100 | } |
1101 | ||
76ee65bf | 1102 | static int |
358c8d9d | 1103 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1104 | { |
3017b80b | 1105 | /* |
7848ba7d JB |
1106 | * Pass through unencrypted frames if the hardware has |
1107 | * decrypted them already. | |
3017b80b | 1108 | */ |
5cf121c3 | 1109 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1110 | return 0; |
571ecf67 JB |
1111 | |
1112 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1113 | if (unlikely(!ieee80211_has_protected(fc) && |
1114 | !ieee80211_is_nullfunc(fc) && | |
b3fc9c6c | 1115 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1116 | return -EACCES; |
b3fc9c6c | 1117 | |
76ee65bf | 1118 | return 0; |
571ecf67 JB |
1119 | } |
1120 | ||
76ee65bf | 1121 | static int |
5cf121c3 | 1122 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1123 | { |
1124 | struct net_device *dev = rx->dev; | |
571ecf67 | 1125 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1126 | u16 hdrlen, ethertype; |
571ecf67 JB |
1127 | u8 *payload; |
1128 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1129 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1130 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1131 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1132 | ||
b73d70ad | 1133 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1134 | return -1; |
571ecf67 | 1135 | |
b73d70ad | 1136 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1137 | |
1138 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1139 | * header | |
1140 | * IEEE 802.11 address fields: | |
1141 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1142 | * 0 0 DA SA BSSID n/a | |
1143 | * 0 1 DA BSSID SA n/a | |
1144 | * 1 0 BSSID SA DA n/a | |
1145 | * 1 1 RA TA DA SA | |
1146 | */ | |
b73d70ad HH |
1147 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1148 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1149 | |
b73d70ad HH |
1150 | switch (hdr->frame_control & |
1151 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1152 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS): | |
05c914fe JB |
1153 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1154 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1155 | return -1; |
571ecf67 | 1156 | break; |
b73d70ad | 1157 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1158 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1159 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1160 | return -1; |
79617dee Y |
1161 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1162 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1163 | (skb->data + hdrlen); | |
1164 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1165 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1166 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1167 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1168 | } | |
1169 | } | |
571ecf67 | 1170 | break; |
b73d70ad | 1171 | case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1172 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1173 | (is_multicast_ether_addr(dst) && |
1174 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1175 | return -1; |
571ecf67 | 1176 | break; |
b73d70ad | 1177 | case __constant_cpu_to_le16(0): |
05c914fe | 1178 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1179 | return -1; |
571ecf67 JB |
1180 | break; |
1181 | } | |
1182 | ||
f4ea83dd | 1183 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1184 | return -1; |
571ecf67 | 1185 | |
76ee65bf | 1186 | payload = skb->data + hdrlen; |
571ecf67 JB |
1187 | ethertype = (payload[6] << 8) | payload[7]; |
1188 | ||
1189 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1190 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1191 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1192 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1193 | * replace EtherType */ | |
1194 | skb_pull(skb, hdrlen + 6); | |
1195 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1196 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1197 | } else { | |
1198 | struct ethhdr *ehdr; | |
1199 | __be16 len; | |
ce3edf6d | 1200 | |
571ecf67 JB |
1201 | skb_pull(skb, hdrlen); |
1202 | len = htons(skb->len); | |
1203 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1204 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1205 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1206 | ehdr->h_proto = len; | |
1207 | } | |
76ee65bf RR |
1208 | return 0; |
1209 | } | |
571ecf67 | 1210 | |
ce3edf6d JB |
1211 | /* |
1212 | * requires that rx->skb is a frame with ethernet header | |
1213 | */ | |
358c8d9d | 1214 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1215 | { |
c97c23e3 | 1216 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1217 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1218 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1219 | ||
1220 | /* | |
1221 | * Allow EAPOL frames to us/the PAE group address regardless | |
1222 | * of whether the frame was encrypted or not. | |
1223 | */ | |
1224 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1225 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1226 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1227 | return true; | |
1228 | ||
1229 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1230 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1231 | return false; |
1232 | ||
1233 | return true; | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * requires that rx->skb is a frame with ethernet header | |
1238 | */ | |
76ee65bf | 1239 | static void |
5cf121c3 | 1240 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1241 | { |
1242 | struct net_device *dev = rx->dev; | |
1243 | struct ieee80211_local *local = rx->local; | |
1244 | struct sk_buff *skb, *xmit_skb; | |
1245 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1246 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1247 | struct sta_info *dsta; | |
571ecf67 | 1248 | |
76ee65bf RR |
1249 | skb = rx->skb; |
1250 | xmit_skb = NULL; | |
571ecf67 | 1251 | |
05c914fe JB |
1252 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1253 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1254 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1255 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1256 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1257 | /* | |
1258 | * send multicast frames both to higher layers in | |
1259 | * local net stack and back to the wireless medium | |
1260 | */ | |
76ee65bf RR |
1261 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1262 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1263 | printk(KERN_DEBUG "%s: failed to clone " |
1264 | "multicast frame\n", dev->name); | |
1265 | } else { | |
571ecf67 | 1266 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1267 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1268 | /* |
1269 | * The destination station is associated to | |
1270 | * this AP (in this VLAN), so send the frame | |
1271 | * directly to it and do not pass it to local | |
1272 | * net stack. | |
571ecf67 | 1273 | */ |
76ee65bf | 1274 | xmit_skb = skb; |
571ecf67 JB |
1275 | skb = NULL; |
1276 | } | |
571ecf67 JB |
1277 | } |
1278 | } | |
1279 | ||
1280 | if (skb) { | |
d1c3a37c JB |
1281 | int align __maybe_unused; |
1282 | ||
1283 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1284 | /* | |
1285 | * 'align' will only take the values 0 or 2 here | |
1286 | * since all frames are required to be aligned | |
1287 | * to 2-byte boundaries when being passed to | |
1288 | * mac80211. That also explains the __skb_push() | |
1289 | * below. | |
1290 | */ | |
1291 | align = (unsigned long)skb->data & 4; | |
1292 | if (align) { | |
1293 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1294 | dev_kfree_skb(skb); | |
1295 | skb = NULL; | |
1296 | } else { | |
1297 | u8 *data = skb->data; | |
1298 | size_t len = skb->len; | |
1299 | u8 *new = __skb_push(skb, align); | |
1300 | memmove(new, data, len); | |
1301 | __skb_trim(skb, len); | |
1302 | } | |
1303 | } | |
1304 | #endif | |
1305 | ||
1306 | if (skb) { | |
1307 | /* deliver to local stack */ | |
1308 | skb->protocol = eth_type_trans(skb, dev); | |
1309 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1310 | netif_rx(skb); | |
1311 | } | |
571ecf67 JB |
1312 | } |
1313 | ||
76ee65bf | 1314 | if (xmit_skb) { |
571ecf67 | 1315 | /* send to wireless media */ |
f831e909 | 1316 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1317 | skb_reset_network_header(xmit_skb); |
1318 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1319 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1320 | } |
76ee65bf RR |
1321 | } |
1322 | ||
49461622 | 1323 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1324 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1325 | { |
1326 | struct net_device *dev = rx->dev; | |
1327 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1328 | u16 ethertype; |
fd4c7f2f RR |
1329 | u8 *payload; |
1330 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1331 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1332 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1333 | const struct ethhdr *eth; |
1334 | int remaining, err; | |
1335 | u8 dst[ETH_ALEN]; | |
1336 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1337 | |
358c8d9d | 1338 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1339 | return RX_CONTINUE; |
fd4c7f2f | 1340 | |
358c8d9d | 1341 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1342 | return RX_DROP_MONITOR; |
fd4c7f2f | 1343 | |
5cf121c3 | 1344 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1345 | return RX_CONTINUE; |
fd4c7f2f RR |
1346 | |
1347 | err = ieee80211_data_to_8023(rx); | |
1348 | if (unlikely(err)) | |
e4c26add | 1349 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1350 | |
1351 | skb->dev = dev; | |
1352 | ||
1353 | dev->stats.rx_packets++; | |
1354 | dev->stats.rx_bytes += skb->len; | |
1355 | ||
1356 | /* skip the wrapping header */ | |
1357 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1358 | if (!eth) | |
e4c26add | 1359 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1360 | |
1361 | while (skb != frame) { | |
1362 | u8 padding; | |
1363 | __be16 len = eth->h_proto; | |
1364 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1365 | ||
1366 | remaining = skb->len; | |
1367 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1368 | memcpy(src, eth->h_source, ETH_ALEN); | |
1369 | ||
1370 | padding = ((4 - subframe_len) & 0x3); | |
1371 | /* the last MSDU has no padding */ | |
f4ea83dd | 1372 | if (subframe_len > remaining) |
e4c26add | 1373 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1374 | |
1375 | skb_pull(skb, sizeof(struct ethhdr)); | |
1376 | /* if last subframe reuse skb */ | |
1377 | if (remaining <= subframe_len + padding) | |
1378 | frame = skb; | |
1379 | else { | |
d1c3a37c JB |
1380 | /* |
1381 | * Allocate and reserve two bytes more for payload | |
1382 | * alignment since sizeof(struct ethhdr) is 14. | |
1383 | */ | |
1384 | frame = dev_alloc_skb( | |
1385 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1386 | subframe_len + 2); | |
fd4c7f2f RR |
1387 | |
1388 | if (frame == NULL) | |
e4c26add | 1389 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1390 | |
d1c3a37c JB |
1391 | skb_reserve(frame, |
1392 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1393 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1394 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1395 | ntohs(len)); | |
1396 | ||
1397 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1398 | padding); | |
1399 | if (!eth) { | |
fd4c7f2f | 1400 | dev_kfree_skb(frame); |
e4c26add | 1401 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1402 | } |
1403 | } | |
1404 | ||
ce3edf6d | 1405 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1406 | frame->dev = dev; |
1407 | frame->priority = skb->priority; | |
1408 | rx->skb = frame; | |
1409 | ||
fd4c7f2f RR |
1410 | payload = frame->data; |
1411 | ethertype = (payload[6] << 8) | payload[7]; | |
1412 | ||
1413 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1414 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1415 | compare_ether_addr(payload, | |
1416 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1417 | /* remove RFC1042 or Bridge-Tunnel |
1418 | * encapsulation and replace EtherType */ | |
1419 | skb_pull(frame, 6); | |
1420 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1421 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1422 | } else { | |
ce3edf6d JB |
1423 | memcpy(skb_push(frame, sizeof(__be16)), |
1424 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1425 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1426 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1427 | } | |
1428 | ||
358c8d9d | 1429 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1430 | if (skb == frame) /* last frame */ |
e4c26add | 1431 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1432 | dev_kfree_skb(frame); |
1433 | continue; | |
1434 | } | |
fd4c7f2f RR |
1435 | |
1436 | ieee80211_deliver_skb(rx); | |
1437 | } | |
1438 | ||
9ae54c84 | 1439 | return RX_QUEUED; |
fd4c7f2f RR |
1440 | } |
1441 | ||
bf94e17b | 1442 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1443 | static ieee80211_rx_result |
e32f85f7 LCC |
1444 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1445 | { | |
1446 | struct ieee80211_hdr *hdr; | |
1447 | struct ieee80211s_hdr *mesh_hdr; | |
1448 | unsigned int hdrlen; | |
1449 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1450 | ||
1451 | hdr = (struct ieee80211_hdr *) skb->data; | |
1452 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1453 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1454 | ||
1455 | if (!ieee80211_is_data(hdr->frame_control)) | |
1456 | return RX_CONTINUE; | |
1457 | ||
1458 | if (!mesh_hdr->ttl) | |
1459 | /* illegal frame */ | |
1460 | return RX_DROP_MONITOR; | |
1461 | ||
79617dee Y |
1462 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1463 | struct ieee80211_sub_if_data *sdata; | |
1464 | struct mesh_path *mppath; | |
1465 | ||
1466 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1467 | rcu_read_lock(); | |
1468 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1469 | if (!mppath) { | |
1470 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1471 | } else { | |
1472 | spin_lock_bh(&mppath->state_lock); | |
1473 | mppath->exp_time = jiffies; | |
1474 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1475 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1476 | spin_unlock_bh(&mppath->state_lock); | |
1477 | } | |
1478 | rcu_read_unlock(); | |
1479 | } | |
1480 | ||
e32f85f7 LCC |
1481 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1482 | return RX_CONTINUE; | |
1483 | ||
1484 | mesh_hdr->ttl--; | |
1485 | ||
1486 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1487 | if (!mesh_hdr->ttl) | |
472dbc45 | 1488 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1489 | dropped_frames_ttl); |
1490 | else { | |
1491 | struct ieee80211_hdr *fwd_hdr; | |
1492 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1493 | ||
1494 | if (!fwd_skb && net_ratelimit()) | |
1495 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1496 | rx->dev->name); | |
1497 | ||
1498 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1499 | /* | |
1500 | * Save TA to addr1 to send TA a path error if a | |
1501 | * suitable next hop is not found | |
1502 | */ | |
1503 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1504 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1505 | fwd_skb->dev = rx->local->mdev; | |
1506 | fwd_skb->iif = rx->dev->ifindex; | |
1507 | dev_queue_xmit(fwd_skb); | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | if (is_multicast_ether_addr(hdr->addr3) || | |
1512 | rx->dev->flags & IFF_PROMISC) | |
1513 | return RX_CONTINUE; | |
1514 | else | |
1515 | return RX_DROP_MONITOR; | |
1516 | } | |
bf94e17b | 1517 | #endif |
e32f85f7 | 1518 | |
49461622 | 1519 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1520 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1521 | { |
1522 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1523 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1524 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1525 | int err; |
76ee65bf | 1526 | |
358c8d9d | 1527 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1528 | return RX_CONTINUE; |
76ee65bf | 1529 | |
358c8d9d | 1530 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1531 | return RX_DROP_MONITOR; |
76ee65bf | 1532 | |
76ee65bf RR |
1533 | err = ieee80211_data_to_8023(rx); |
1534 | if (unlikely(err)) | |
e4c26add | 1535 | return RX_DROP_UNUSABLE; |
76ee65bf | 1536 | |
358c8d9d | 1537 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1538 | return RX_DROP_MONITOR; |
ce3edf6d | 1539 | |
76ee65bf RR |
1540 | rx->skb->dev = dev; |
1541 | ||
1542 | dev->stats.rx_packets++; | |
1543 | dev->stats.rx_bytes += rx->skb->len; | |
1544 | ||
1545 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1546 | |
9ae54c84 | 1547 | return RX_QUEUED; |
571ecf67 JB |
1548 | } |
1549 | ||
49461622 | 1550 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1551 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1552 | { |
1553 | struct ieee80211_local *local = rx->local; | |
1554 | struct ieee80211_hw *hw = &local->hw; | |
1555 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1556 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1557 | struct tid_ampdu_rx *tid_agg_rx; |
1558 | u16 start_seq_num; | |
1559 | u16 tid; | |
1560 | ||
a7767f95 | 1561 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1562 | return RX_CONTINUE; |
71364716 | 1563 | |
a7767f95 | 1564 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1565 | if (!rx->sta) |
9ae54c84 | 1566 | return RX_CONTINUE; |
71364716 | 1567 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1568 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1569 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1570 | return RX_CONTINUE; |
cee24a3e | 1571 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1572 | |
1573 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1574 | ||
1575 | /* reset session timer */ | |
1576 | if (tid_agg_rx->timeout) { | |
1577 | unsigned long expires = | |
1578 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1579 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1580 | } | |
1581 | ||
1582 | /* manage reordering buffer according to requested */ | |
1583 | /* sequence number */ | |
1584 | rcu_read_lock(); | |
1585 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1586 | start_seq_num, 1); | |
1587 | rcu_read_unlock(); | |
e4c26add | 1588 | return RX_DROP_UNUSABLE; |
71364716 RR |
1589 | } |
1590 | ||
9ae54c84 | 1591 | return RX_CONTINUE; |
71364716 RR |
1592 | } |
1593 | ||
de1ede7a JB |
1594 | static ieee80211_rx_result debug_noinline |
1595 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1596 | { | |
1597 | struct ieee80211_local *local = rx->local; | |
1598 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
c481ec97 | 1599 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
de1ede7a | 1600 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
c481ec97 | 1601 | struct ieee80211_bss *bss; |
de1ede7a JB |
1602 | int len = rx->skb->len; |
1603 | ||
1604 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1605 | return RX_CONTINUE; | |
1606 | ||
1607 | if (!rx->sta) | |
1608 | return RX_DROP_MONITOR; | |
1609 | ||
1610 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1611 | return RX_DROP_MONITOR; | |
1612 | ||
1613 | /* all categories we currently handle have action_code */ | |
1614 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1615 | return RX_DROP_MONITOR; | |
1616 | ||
de1ede7a JB |
1617 | switch (mgmt->u.action.category) { |
1618 | case WLAN_CATEGORY_BACK: | |
1619 | switch (mgmt->u.action.u.addba_req.action_code) { | |
1620 | case WLAN_ACTION_ADDBA_REQ: | |
1621 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1622 | sizeof(mgmt->u.action.u.addba_req))) | |
1623 | return RX_DROP_MONITOR; | |
1624 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1625 | break; | |
1626 | case WLAN_ACTION_ADDBA_RESP: | |
1627 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1628 | sizeof(mgmt->u.action.u.addba_resp))) | |
1629 | return RX_DROP_MONITOR; | |
1630 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1631 | break; | |
1632 | case WLAN_ACTION_DELBA: | |
1633 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1634 | sizeof(mgmt->u.action.u.delba))) | |
1635 | return RX_DROP_MONITOR; | |
1636 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1637 | break; | |
1638 | } | |
39192c0b JB |
1639 | break; |
1640 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1641 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1642 | return RX_DROP_MONITOR; | |
1643 | switch (mgmt->u.action.u.measurement.action_code) { | |
1644 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1645 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1646 | sizeof(mgmt->u.action.u.measurement))) | |
1647 | return RX_DROP_MONITOR; | |
1648 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1649 | break; | |
c481ec97 S |
1650 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1651 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1652 | sizeof(mgmt->u.action.u.chan_switch))) | |
1653 | return RX_DROP_MONITOR; | |
1654 | ||
1655 | if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0) | |
1656 | return RX_DROP_MONITOR; | |
1657 | ||
1658 | bss = ieee80211_rx_bss_get(local, ifsta->bssid, | |
1659 | local->hw.conf.channel->center_freq, | |
1660 | ifsta->ssid, ifsta->ssid_len); | |
1661 | if (!bss) | |
1662 | return RX_DROP_MONITOR; | |
1663 | ||
1664 | ieee80211_process_chanswitch(sdata, | |
1665 | &mgmt->u.action.u.chan_switch.sw_elem, bss); | |
1666 | ieee80211_rx_bss_put(local, bss); | |
1667 | break; | |
39192c0b JB |
1668 | } |
1669 | break; | |
1670 | default: | |
1671 | return RX_CONTINUE; | |
de1ede7a JB |
1672 | } |
1673 | ||
39192c0b JB |
1674 | rx->sta->rx_packets++; |
1675 | dev_kfree_skb(rx->skb); | |
1676 | return RX_QUEUED; | |
de1ede7a JB |
1677 | } |
1678 | ||
49461622 | 1679 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1680 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1681 | { |
759ef3eb | 1682 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 | 1683 | |
5cf121c3 | 1684 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1685 | return RX_DROP_MONITOR; |
571ecf67 | 1686 | |
472dbc45 JB |
1687 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1688 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1689 | ||
05c914fe JB |
1690 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
1691 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
759ef3eb JB |
1692 | return RX_DROP_MONITOR; |
1693 | ||
1694 | if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME) | |
e4c26add | 1695 | return RX_DROP_MONITOR; |
f9d540ee | 1696 | |
759ef3eb | 1697 | ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
9ae54c84 | 1698 | return RX_QUEUED; |
571ecf67 JB |
1699 | } |
1700 | ||
571ecf67 JB |
1701 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1702 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1703 | struct ieee80211_rx_data *rx) |
571ecf67 | 1704 | { |
a7767f95 HH |
1705 | int keyidx; |
1706 | unsigned int hdrlen; | |
571ecf67 | 1707 | |
a7767f95 | 1708 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1709 | if (rx->skb->len >= hdrlen + 4) |
1710 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1711 | else | |
1712 | keyidx = -1; | |
1713 | ||
8944b79f | 1714 | if (!rx->sta) { |
aa0daf0e JB |
1715 | /* |
1716 | * Some hardware seem to generate incorrect Michael MIC | |
1717 | * reports; ignore them to avoid triggering countermeasures. | |
1718 | */ | |
571ecf67 JB |
1719 | goto ignore; |
1720 | } | |
1721 | ||
a7767f95 | 1722 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1723 | goto ignore; |
571ecf67 | 1724 | |
05c914fe | 1725 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1726 | /* |
1727 | * APs with pairwise keys should never receive Michael MIC | |
1728 | * errors for non-zero keyidx because these are reserved for | |
1729 | * group keys and only the AP is sending real multicast | |
1730 | * frames in the BSS. | |
1731 | */ | |
eb063c17 | 1732 | goto ignore; |
571ecf67 JB |
1733 | } |
1734 | ||
a7767f95 HH |
1735 | if (!ieee80211_is_data(hdr->frame_control) && |
1736 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1737 | goto ignore; |
571ecf67 | 1738 | |
f698d856 | 1739 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1740 | ignore: |
1741 | dev_kfree_skb(rx->skb); | |
1742 | rx->skb = NULL; | |
1743 | } | |
1744 | ||
5cf121c3 JB |
1745 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1746 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1747 | { |
1748 | struct ieee80211_sub_if_data *sdata; | |
1749 | struct ieee80211_local *local = rx->local; | |
1750 | struct ieee80211_rtap_hdr { | |
1751 | struct ieee80211_radiotap_header hdr; | |
1752 | u8 flags; | |
1753 | u8 rate; | |
1754 | __le16 chan_freq; | |
1755 | __le16 chan_flags; | |
1756 | } __attribute__ ((packed)) *rthdr; | |
1757 | struct sk_buff *skb = rx->skb, *skb2; | |
1758 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1759 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1760 | |
5cf121c3 | 1761 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1762 | goto out_free_skb; |
1763 | ||
1764 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1765 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1766 | goto out_free_skb; | |
1767 | ||
1768 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1769 | memset(rthdr, 0, sizeof(*rthdr)); | |
1770 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1771 | rthdr->hdr.it_present = | |
1772 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1773 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1774 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1775 | ||
5cf121c3 | 1776 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1777 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1778 | ||
1779 | if (status->band == IEEE80211_BAND_5GHZ) | |
1780 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1781 | IEEE80211_CHAN_5GHZ); | |
1782 | else | |
1783 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1784 | IEEE80211_CHAN_2GHZ); | |
1785 | ||
1786 | skb_set_mac_header(skb, 0); | |
1787 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1788 | skb->pkt_type = PACKET_OTHERHOST; | |
1789 | skb->protocol = htons(ETH_P_802_2); | |
1790 | ||
1791 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1792 | if (!netif_running(sdata->dev)) | |
1793 | continue; | |
1794 | ||
05c914fe | 1795 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1796 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1797 | continue; | |
1798 | ||
1799 | if (prev_dev) { | |
1800 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1801 | if (skb2) { | |
1802 | skb2->dev = prev_dev; | |
1803 | netif_rx(skb2); | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | prev_dev = sdata->dev; | |
1808 | sdata->dev->stats.rx_packets++; | |
1809 | sdata->dev->stats.rx_bytes += skb->len; | |
1810 | } | |
1811 | ||
1812 | if (prev_dev) { | |
1813 | skb->dev = prev_dev; | |
1814 | netif_rx(skb); | |
1815 | skb = NULL; | |
1816 | } else | |
1817 | goto out_free_skb; | |
1818 | ||
5cf121c3 | 1819 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1820 | return; |
1821 | ||
1822 | out_free_skb: | |
1823 | dev_kfree_skb(skb); | |
1824 | } | |
1825 | ||
571ecf67 | 1826 | |
8944b79f | 1827 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1828 | struct ieee80211_rx_data *rx, |
8944b79f | 1829 | struct sk_buff *skb) |
58905290 | 1830 | { |
58905290 JB |
1831 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1832 | ||
8944b79f JB |
1833 | rx->skb = skb; |
1834 | rx->sdata = sdata; | |
1835 | rx->dev = sdata->dev; | |
1836 | ||
e32f85f7 LCC |
1837 | #define CALL_RXH(rxh) \ |
1838 | do { \ | |
1839 | res = rxh(rx); \ | |
1840 | if (res != RX_CONTINUE) \ | |
1841 | goto rxh_done; \ | |
1842 | } while (0); | |
49461622 JB |
1843 | |
1844 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1845 | CALL_RXH(ieee80211_rx_h_check) | |
1846 | CALL_RXH(ieee80211_rx_h_decrypt) | |
1847 | CALL_RXH(ieee80211_rx_h_sta_process) | |
1848 | CALL_RXH(ieee80211_rx_h_defragment) | |
1849 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1850 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1851 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1852 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1853 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1854 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1855 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1856 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1857 | #endif |
49461622 JB |
1858 | CALL_RXH(ieee80211_rx_h_data) |
1859 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1860 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1861 | CALL_RXH(ieee80211_rx_h_mgmt) |
1862 | ||
1863 | #undef CALL_RXH | |
1864 | ||
1865 | rxh_done: | |
58905290 JB |
1866 | switch (res) { |
1867 | case RX_DROP_MONITOR: | |
49461622 JB |
1868 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1869 | if (rx->sta) | |
1870 | rx->sta->rx_dropped++; | |
1871 | /* fall through */ | |
1872 | case RX_CONTINUE: | |
3d30d949 MW |
1873 | ieee80211_rx_cooked_monitor(rx); |
1874 | break; | |
58905290 | 1875 | case RX_DROP_UNUSABLE: |
49461622 JB |
1876 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1877 | if (rx->sta) | |
1878 | rx->sta->rx_dropped++; | |
58905290 JB |
1879 | dev_kfree_skb(rx->skb); |
1880 | break; | |
49461622 JB |
1881 | case RX_QUEUED: |
1882 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1883 | break; | |
58905290 JB |
1884 | } |
1885 | } | |
1886 | ||
571ecf67 JB |
1887 | /* main receive path */ |
1888 | ||
23a24def | 1889 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1890 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1891 | struct ieee80211_hdr *hdr) |
1892 | { | |
1893 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1894 | ||
51fb61e7 | 1895 | switch (sdata->vif.type) { |
05c914fe | 1896 | case NL80211_IFTYPE_STATION: |
23a24def JB |
1897 | if (!bssid) |
1898 | return 0; | |
1899 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1900 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1901 | return 0; |
5cf121c3 | 1902 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1903 | } else if (!multicast && |
1904 | compare_ether_addr(sdata->dev->dev_addr, | |
1905 | hdr->addr1) != 0) { | |
4150c572 | 1906 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1907 | return 0; |
5cf121c3 | 1908 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1909 | } |
1910 | break; | |
05c914fe | 1911 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
1912 | if (!bssid) |
1913 | return 0; | |
a7767f95 | 1914 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 1915 | return 1; |
87291c02 | 1916 | } |
9d9bf77d | 1917 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 1918 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1919 | return 0; |
5cf121c3 | 1920 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1921 | } else if (!multicast && |
1922 | compare_ether_addr(sdata->dev->dev_addr, | |
1923 | hdr->addr1) != 0) { | |
4150c572 | 1924 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1925 | return 0; |
5cf121c3 | 1926 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
1927 | } else if (!rx->sta) { |
1928 | int rate_idx; | |
1929 | if (rx->status->flag & RX_FLAG_HT) | |
1930 | rate_idx = 0; /* TODO: HT rates */ | |
1931 | else | |
1932 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 1933 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
1934 | BIT(rate_idx)); |
1935 | } | |
23a24def | 1936 | break; |
05c914fe | 1937 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
1938 | if (!multicast && |
1939 | compare_ether_addr(sdata->dev->dev_addr, | |
1940 | hdr->addr1) != 0) { | |
1941 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1942 | return 0; | |
1943 | ||
5cf121c3 | 1944 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1945 | } |
1946 | break; | |
05c914fe JB |
1947 | case NL80211_IFTYPE_AP_VLAN: |
1948 | case NL80211_IFTYPE_AP: | |
23a24def JB |
1949 | if (!bssid) { |
1950 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1951 | hdr->addr1)) | |
1952 | return 0; | |
1953 | } else if (!ieee80211_bssid_match(bssid, | |
1954 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1955 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1956 | return 0; |
5cf121c3 | 1957 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1958 | } |
23a24def | 1959 | break; |
05c914fe | 1960 | case NL80211_IFTYPE_WDS: |
a7767f95 | 1961 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
1962 | return 0; |
1963 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1964 | return 0; | |
1965 | break; | |
05c914fe | 1966 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
1967 | /* take everything */ |
1968 | break; | |
05c914fe JB |
1969 | case NL80211_IFTYPE_UNSPECIFIED: |
1970 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
1971 | /* should never get here */ |
1972 | WARN_ON(1); | |
1973 | break; | |
23a24def JB |
1974 | } |
1975 | ||
1976 | return 1; | |
1977 | } | |
1978 | ||
571ecf67 | 1979 | /* |
6368e4b1 RR |
1980 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1981 | * be called with rcu_read_lock protection. | |
571ecf67 | 1982 | */ |
71ebb4aa RR |
1983 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1984 | struct sk_buff *skb, | |
1985 | struct ieee80211_rx_status *status, | |
8318d78a | 1986 | struct ieee80211_rate *rate) |
571ecf67 JB |
1987 | { |
1988 | struct ieee80211_local *local = hw_to_local(hw); | |
1989 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1990 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1991 | struct ieee80211_rx_data rx; |
6368e4b1 | 1992 | int prepares; |
8e6f0032 JB |
1993 | struct ieee80211_sub_if_data *prev = NULL; |
1994 | struct sk_buff *skb_new; | |
1995 | u8 *bssid; | |
571ecf67 | 1996 | |
358c8d9d | 1997 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
1998 | memset(&rx, 0, sizeof(rx)); |
1999 | rx.skb = skb; | |
2000 | rx.local = local; | |
2001 | ||
5cf121c3 | 2002 | rx.status = status; |
5cf121c3 | 2003 | rx.rate = rate; |
72abd81b | 2004 | |
358c8d9d | 2005 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2006 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2007 | |
8944b79f JB |
2008 | rx.sta = sta_info_get(local, hdr->addr2); |
2009 | if (rx.sta) { | |
d0709a65 JB |
2010 | rx.sdata = rx.sta->sdata; |
2011 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2012 | } |
571ecf67 | 2013 | |
571ecf67 | 2014 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2015 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2016 | return; |
571ecf67 JB |
2017 | } |
2018 | ||
c2b13452 | 2019 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2020 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2021 | |
38f3714d | 2022 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2023 | ieee80211_verify_alignment(&rx); |
38f3714d | 2024 | |
571ecf67 JB |
2025 | skb = rx.skb; |
2026 | ||
79010420 | 2027 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2028 | if (!netif_running(sdata->dev)) |
2029 | continue; | |
2030 | ||
05c914fe | 2031 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2032 | continue; |
2033 | ||
51fb61e7 | 2034 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 2035 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 2036 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 2037 | |
6368e4b1 | 2038 | if (!prepares) |
23a24def | 2039 | continue; |
8e6f0032 | 2040 | |
340e11f3 JB |
2041 | /* |
2042 | * frame is destined for this interface, but if it's not | |
2043 | * also for the previous one we handle that after the | |
2044 | * loop to avoid copying the SKB once too much | |
2045 | */ | |
2046 | ||
2047 | if (!prev) { | |
2048 | prev = sdata; | |
2049 | continue; | |
8e6f0032 | 2050 | } |
340e11f3 JB |
2051 | |
2052 | /* | |
2053 | * frame was destined for the previous interface | |
2054 | * so invoke RX handlers for it | |
2055 | */ | |
2056 | ||
2057 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2058 | if (!skb_new) { | |
2059 | if (net_ratelimit()) | |
2060 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2061 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2062 | wiphy_name(local->hw.wiphy), |
2063 | prev->dev->name); | |
340e11f3 JB |
2064 | continue; |
2065 | } | |
8944b79f | 2066 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2067 | prev = sdata; |
571ecf67 | 2068 | } |
a4b7d7bd | 2069 | if (prev) |
8944b79f | 2070 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2071 | else |
8e6f0032 | 2072 | dev_kfree_skb(skb); |
571ecf67 | 2073 | } |
6368e4b1 | 2074 | |
b580781e RR |
2075 | #define SEQ_MODULO 0x1000 |
2076 | #define SEQ_MASK 0xfff | |
2077 | ||
2078 | static inline int seq_less(u16 sq1, u16 sq2) | |
2079 | { | |
c6a1fa12 | 2080 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2081 | } |
2082 | ||
2083 | static inline u16 seq_inc(u16 sq) | |
2084 | { | |
c6a1fa12 | 2085 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2086 | } |
2087 | ||
2088 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2089 | { | |
c6a1fa12 | 2090 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2091 | } |
2092 | ||
2093 | ||
71364716 RR |
2094 | /* |
2095 | * As it function blongs to Rx path it must be called with | |
2096 | * the proper rcu_read_lock protection for its flow. | |
2097 | */ | |
c6a1fa12 JB |
2098 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2099 | struct tid_ampdu_rx *tid_agg_rx, | |
2100 | struct sk_buff *skb, | |
2101 | u16 mpdu_seq_num, | |
2102 | int bar_req) | |
b580781e RR |
2103 | { |
2104 | struct ieee80211_local *local = hw_to_local(hw); | |
2105 | struct ieee80211_rx_status status; | |
2106 | u16 head_seq_num, buf_size; | |
2107 | int index; | |
8318d78a JB |
2108 | struct ieee80211_supported_band *sband; |
2109 | struct ieee80211_rate *rate; | |
b580781e RR |
2110 | |
2111 | buf_size = tid_agg_rx->buf_size; | |
2112 | head_seq_num = tid_agg_rx->head_seq_num; | |
2113 | ||
2114 | /* frame with out of date sequence number */ | |
2115 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2116 | dev_kfree_skb(skb); | |
2117 | return 1; | |
2118 | } | |
2119 | ||
2120 | /* if frame sequence number exceeds our buffering window size or | |
2121 | * block Ack Request arrived - release stored frames */ | |
2122 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2123 | /* new head to the ordering buffer */ | |
2124 | if (bar_req) | |
2125 | head_seq_num = mpdu_seq_num; | |
2126 | else | |
2127 | head_seq_num = | |
2128 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2129 | /* release stored frames up to new head to stack */ | |
2130 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2131 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2132 | tid_agg_rx->ssn) | |
2133 | % tid_agg_rx->buf_size; | |
2134 | ||
2135 | if (tid_agg_rx->reorder_buf[index]) { | |
2136 | /* release the reordered frames to stack */ | |
2137 | memcpy(&status, | |
2138 | tid_agg_rx->reorder_buf[index]->cb, | |
2139 | sizeof(status)); | |
8318d78a | 2140 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2141 | if (status.flag & RX_FLAG_HT) { |
2142 | /* TODO: HT rates */ | |
2143 | rate = sband->bitrates; | |
2144 | } else { | |
2145 | rate = &sband->bitrates | |
2146 | [status.rate_idx]; | |
2147 | } | |
b580781e RR |
2148 | __ieee80211_rx_handle_packet(hw, |
2149 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2150 | &status, rate); |
b580781e RR |
2151 | tid_agg_rx->stored_mpdu_num--; |
2152 | tid_agg_rx->reorder_buf[index] = NULL; | |
2153 | } | |
2154 | tid_agg_rx->head_seq_num = | |
2155 | seq_inc(tid_agg_rx->head_seq_num); | |
2156 | } | |
2157 | if (bar_req) | |
2158 | return 1; | |
2159 | } | |
2160 | ||
2161 | /* now the new frame is always in the range of the reordering */ | |
2162 | /* buffer window */ | |
2163 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2164 | % tid_agg_rx->buf_size; | |
2165 | /* check if we already stored this frame */ | |
2166 | if (tid_agg_rx->reorder_buf[index]) { | |
2167 | dev_kfree_skb(skb); | |
2168 | return 1; | |
2169 | } | |
2170 | ||
2171 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2172 | /* release it immediately */ | |
2173 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2174 | tid_agg_rx->stored_mpdu_num == 0) { | |
2175 | tid_agg_rx->head_seq_num = | |
2176 | seq_inc(tid_agg_rx->head_seq_num); | |
2177 | return 0; | |
2178 | } | |
2179 | ||
2180 | /* put the frame in the reordering buffer */ | |
2181 | tid_agg_rx->reorder_buf[index] = skb; | |
2182 | tid_agg_rx->stored_mpdu_num++; | |
2183 | /* release the buffer until next missing frame */ | |
2184 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2185 | % tid_agg_rx->buf_size; | |
2186 | while (tid_agg_rx->reorder_buf[index]) { | |
2187 | /* release the reordered frame back to stack */ | |
2188 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2189 | sizeof(status)); | |
8318d78a | 2190 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2191 | if (status.flag & RX_FLAG_HT) |
2192 | rate = sband->bitrates; /* TODO: HT rates */ | |
2193 | else | |
2194 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2195 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2196 | &status, rate); |
b580781e RR |
2197 | tid_agg_rx->stored_mpdu_num--; |
2198 | tid_agg_rx->reorder_buf[index] = NULL; | |
2199 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2200 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2201 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2202 | } | |
2203 | return 1; | |
2204 | } | |
2205 | ||
71ebb4aa RR |
2206 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2207 | struct sk_buff *skb) | |
b580781e RR |
2208 | { |
2209 | struct ieee80211_hw *hw = &local->hw; | |
2210 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2211 | struct sta_info *sta; | |
2212 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2213 | u16 sc; |
b580781e | 2214 | u16 mpdu_seq_num; |
182503ab | 2215 | u8 ret = 0; |
b580781e RR |
2216 | int tid; |
2217 | ||
2218 | sta = sta_info_get(local, hdr->addr2); | |
2219 | if (!sta) | |
2220 | return ret; | |
2221 | ||
b580781e RR |
2222 | /* filter the QoS data rx stream according to |
2223 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2224 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2225 | goto end_reorder; |
2226 | ||
238f74a2 | 2227 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2228 | |
cee24a3e | 2229 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2230 | goto end_reorder; |
2231 | ||
cee24a3e RR |
2232 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2233 | ||
2560b6e2 EG |
2234 | /* qos null data frames are excluded */ |
2235 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2236 | goto end_reorder; |
2237 | ||
2238 | /* new un-ordered ampdu frame - process it */ | |
2239 | ||
2240 | /* reset session timer */ | |
2241 | if (tid_agg_rx->timeout) { | |
2242 | unsigned long expires = | |
2243 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2244 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2245 | } | |
2246 | ||
2247 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2248 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2249 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2250 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2251 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2252 | ret = 1; | |
2253 | goto end_reorder; | |
2254 | } | |
2255 | ||
2256 | /* according to mpdu sequence number deal with reordering buffer */ | |
2257 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2258 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2259 | mpdu_seq_num, 0); | |
d0709a65 | 2260 | end_reorder: |
b580781e RR |
2261 | return ret; |
2262 | } | |
2263 | ||
6368e4b1 RR |
2264 | /* |
2265 | * This is the receive path handler. It is called by a low level driver when an | |
2266 | * 802.11 MPDU is received from the hardware. | |
2267 | */ | |
2268 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2269 | struct ieee80211_rx_status *status) | |
2270 | { | |
2271 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2272 | struct ieee80211_rate *rate = NULL; |
2273 | struct ieee80211_supported_band *sband; | |
2274 | ||
2275 | if (status->band < 0 || | |
13d8fd2d | 2276 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2277 | WARN_ON(1); |
2278 | return; | |
2279 | } | |
2280 | ||
2281 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2282 | if (!sband) { |
8318d78a JB |
2283 | WARN_ON(1); |
2284 | return; | |
2285 | } | |
2286 | ||
0fb8ca45 JM |
2287 | if (status->flag & RX_FLAG_HT) { |
2288 | /* rate_idx is MCS index */ | |
2289 | if (WARN_ON(status->rate_idx < 0 || | |
2290 | status->rate_idx >= 76)) | |
2291 | return; | |
2292 | /* HT rates are not in the table - use the highest legacy rate | |
2293 | * for now since other parts of mac80211 may not yet be fully | |
2294 | * MCS aware. */ | |
2295 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2296 | } else { | |
2297 | if (WARN_ON(status->rate_idx < 0 || | |
2298 | status->rate_idx >= sband->n_bitrates)) | |
2299 | return; | |
2300 | rate = &sband->bitrates[status->rate_idx]; | |
2301 | } | |
6368e4b1 RR |
2302 | |
2303 | /* | |
2304 | * key references and virtual interfaces are protected using RCU | |
2305 | * and this requires that we are in a read-side RCU section during | |
2306 | * receive processing | |
2307 | */ | |
2308 | rcu_read_lock(); | |
2309 | ||
2310 | /* | |
2311 | * Frames with failed FCS/PLCP checksum are not returned, | |
2312 | * all other frames are returned without radiotap header | |
2313 | * if it was previously present. | |
2314 | * Also, frames with less than 16 bytes are dropped. | |
2315 | */ | |
8318d78a | 2316 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2317 | if (!skb) { |
2318 | rcu_read_unlock(); | |
2319 | return; | |
2320 | } | |
2321 | ||
b580781e | 2322 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2323 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2324 | |
2325 | rcu_read_unlock(); | |
2326 | } | |
571ecf67 JB |
2327 | EXPORT_SYMBOL(__ieee80211_rx); |
2328 | ||
2329 | /* This is a version of the rx handler that can be called from hard irq | |
2330 | * context. Post the skb on the queue and schedule the tasklet */ | |
2331 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2332 | struct ieee80211_rx_status *status) | |
2333 | { | |
2334 | struct ieee80211_local *local = hw_to_local(hw); | |
2335 | ||
2336 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2337 | ||
2338 | skb->dev = local->mdev; | |
2339 | /* copy status into skb->cb for use by tasklet */ | |
2340 | memcpy(skb->cb, status, sizeof(*status)); | |
2341 | skb->pkt_type = IEEE80211_RX_MSG; | |
2342 | skb_queue_tail(&local->skb_queue, skb); | |
2343 | tasklet_schedule(&local->tasklet); | |
2344 | } | |
2345 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |