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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 | ||
105 | /** | |
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 | |
5cf121c3 | 374 | static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx) |
38f3714d JB |
375 | { |
376 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
a7767f95 | 377 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
378 | int hdrlen; |
379 | ||
a7767f95 | 380 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
381 | return; |
382 | ||
383 | /* | |
384 | * Drivers are required to align the payload data in a way that | |
385 | * guarantees that the contained IP header is aligned to a four- | |
386 | * byte boundary. In the case of regular frames, this simply means | |
387 | * aligning the payload to a four-byte boundary (because either | |
388 | * the IP header is directly contained, or IV/RFC1042 headers that | |
389 | * have a length divisible by four are in front of it. | |
390 | * | |
391 | * With A-MSDU frames, however, the payload data address must | |
392 | * yield two modulo four because there are 14-byte 802.3 headers | |
393 | * within the A-MSDU frames that push the IP header further back | |
394 | * to a multiple of four again. Thankfully, the specs were sane | |
395 | * enough this time around to require padding each A-MSDU subframe | |
396 | * to a length that is a multiple of four. | |
397 | * | |
398 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
399 | * header and the payload is not supported, the driver is required | |
400 | * to move the 802.11 header further back in that case. | |
401 | */ | |
a7767f95 | 402 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 403 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d JB |
404 | hdrlen += ETH_HLEN; |
405 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
406 | #endif | |
6e0d114d JB |
407 | } |
408 | ||
6368e4b1 | 409 | |
571ecf67 JB |
410 | /* rx handlers */ |
411 | ||
49461622 | 412 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 413 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
414 | { |
415 | struct ieee80211_local *local = rx->local; | |
416 | struct sk_buff *skb = rx->skb; | |
417 | ||
c2b13452 JB |
418 | if (unlikely(local->hw_scanning)) |
419 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 420 | |
c2b13452 | 421 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 422 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 423 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 424 | != RX_QUEUED) |
ece8eddd | 425 | dev_kfree_skb(skb); |
9ae54c84 | 426 | return RX_QUEUED; |
571ecf67 JB |
427 | } |
428 | ||
5cf121c3 | 429 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
430 | /* scanning finished during invoking of handlers */ |
431 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 432 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
433 | } |
434 | ||
9ae54c84 | 435 | return RX_CONTINUE; |
571ecf67 JB |
436 | } |
437 | ||
33b64eb2 | 438 | static ieee80211_rx_result |
5cf121c3 | 439 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 440 | { |
a7767f95 HH |
441 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
442 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 443 | |
a7767f95 HH |
444 | if (ieee80211_is_data(hdr->frame_control)) { |
445 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
446 | return RX_DROP_MONITOR; |
447 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
448 | return RX_DROP_MONITOR; | |
449 | } | |
450 | ||
451 | /* If there is not an established peer link and this is not a peer link | |
452 | * establisment frame, beacon or probe, drop the frame. | |
453 | */ | |
454 | ||
b4e08ea1 | 455 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 456 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 457 | |
a7767f95 | 458 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
459 | return RX_DROP_MONITOR; |
460 | ||
a7767f95 | 461 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
462 | mgmt = (struct ieee80211_mgmt *)hdr; |
463 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
464 | return RX_DROP_MONITOR; | |
33b64eb2 | 465 | return RX_CONTINUE; |
33b64eb2 LCC |
466 | } |
467 | ||
a7767f95 HH |
468 | if (ieee80211_is_probe_req(hdr->frame_control) || |
469 | ieee80211_is_probe_resp(hdr->frame_control) || | |
470 | ieee80211_is_beacon(hdr->frame_control)) | |
471 | return RX_CONTINUE; | |
472 | ||
473 | return RX_DROP_MONITOR; | |
474 | ||
475 | } | |
476 | ||
477 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
478 | ||
479 | if (ieee80211_is_data(hdr->frame_control) && | |
480 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 481 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 482 | return RX_DROP_MONITOR; |
902acc78 | 483 | #undef msh_h_get |
d6d1a5a7 | 484 | |
902acc78 JB |
485 | return RX_CONTINUE; |
486 | } | |
33b64eb2 LCC |
487 | |
488 | ||
49461622 | 489 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 490 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 491 | { |
a7767f95 | 492 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
493 | |
494 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
495 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 496 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 497 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 498 | hdr->seq_ctrl)) { |
5cf121c3 | 499 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
500 | rx->local->dot11FrameDuplicateCount++; |
501 | rx->sta->num_duplicates++; | |
502 | } | |
e4c26add | 503 | return RX_DROP_MONITOR; |
571ecf67 | 504 | } else |
5cf121c3 | 505 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
506 | } |
507 | ||
571ecf67 JB |
508 | if (unlikely(rx->skb->len < 16)) { |
509 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 510 | return RX_DROP_MONITOR; |
571ecf67 JB |
511 | } |
512 | ||
571ecf67 JB |
513 | /* Drop disallowed frame classes based on STA auth/assoc state; |
514 | * IEEE 802.11, Chap 5.5. | |
515 | * | |
ccd7b362 JB |
516 | * mac80211 filters only based on association state, i.e. it drops |
517 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
518 | * deauth/disassoc frames when needed. In addition, hostapd is |
519 | * responsible for filtering on both auth and assoc states. | |
520 | */ | |
33b64eb2 | 521 | |
902acc78 | 522 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 523 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 524 | |
a7767f95 HH |
525 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
526 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 527 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 528 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
529 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
530 | !ieee80211_has_tods(hdr->frame_control) && | |
531 | ieee80211_is_data(hdr->frame_control)) || | |
532 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
533 | /* Drop IBSS frames and frames for other hosts |
534 | * silently. */ | |
e4c26add | 535 | return RX_DROP_MONITOR; |
571ecf67 JB |
536 | } |
537 | ||
e4c26add | 538 | return RX_DROP_MONITOR; |
571ecf67 JB |
539 | } |
540 | ||
9ae54c84 | 541 | return RX_CONTINUE; |
570bd537 JB |
542 | } |
543 | ||
544 | ||
49461622 | 545 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 546 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 547 | { |
a7767f95 | 548 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
549 | int keyidx; |
550 | int hdrlen; | |
e4c26add | 551 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 552 | struct ieee80211_key *stakey = NULL; |
570bd537 | 553 | |
3017b80b JB |
554 | /* |
555 | * Key selection 101 | |
556 | * | |
557 | * There are three types of keys: | |
558 | * - GTK (group keys) | |
559 | * - PTK (pairwise keys) | |
560 | * - STK (station-to-station pairwise keys) | |
561 | * | |
562 | * When selecting a key, we have to distinguish between multicast | |
563 | * (including broadcast) and unicast frames, the latter can only | |
564 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
565 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
566 | * frames can also use key indizes like GTKs. Hence, if we don't | |
567 | * have a PTK/STK we check the key index for a WEP key. | |
568 | * | |
8dc06a1c JB |
569 | * Note that in a regular BSS, multicast frames are sent by the |
570 | * AP only, associated stations unicast the frame to the AP first | |
571 | * which then multicasts it on their behalf. | |
572 | * | |
3017b80b JB |
573 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
574 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
575 | * The spec seems to expect that one negotiates the same key with |
576 | * every station but there's no such requirement; VLANs could be | |
577 | * possible. | |
3017b80b JB |
578 | */ |
579 | ||
a7767f95 | 580 | if (!ieee80211_has_protected(hdr->frame_control)) |
9ae54c84 | 581 | return RX_CONTINUE; |
571ecf67 | 582 | |
3017b80b | 583 | /* |
1990af8d | 584 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
585 | * addressed to us nor a multicast frame. |
586 | */ | |
5cf121c3 | 587 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 588 | return RX_CONTINUE; |
3017b80b | 589 | |
d4e46a3d JB |
590 | if (rx->sta) |
591 | stakey = rcu_dereference(rx->sta->key); | |
592 | ||
593 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
594 | rx->key = stakey; | |
571ecf67 | 595 | } else { |
3017b80b JB |
596 | /* |
597 | * The device doesn't give us the IV so we won't be | |
598 | * able to look up the key. That's ok though, we | |
599 | * don't need to decrypt the frame, we just won't | |
600 | * be able to keep statistics accurate. | |
601 | * Except for key threshold notifications, should | |
602 | * we somehow allow the driver to tell us which key | |
603 | * the hardware used if this flag is set? | |
604 | */ | |
5cf121c3 JB |
605 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
606 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 607 | return RX_CONTINUE; |
3017b80b | 608 | |
a7767f95 | 609 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
610 | |
611 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 612 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
613 | |
614 | /* | |
615 | * no need to call ieee80211_wep_get_keyidx, | |
616 | * it verifies a bunch of things we've done already | |
617 | */ | |
618 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
619 | ||
d4e46a3d | 620 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
621 | |
622 | /* | |
623 | * RSNA-protected unicast frames should always be sent with | |
624 | * pairwise or station-to-station keys, but for WEP we allow | |
625 | * using a key index as well. | |
626 | */ | |
8f20fc24 | 627 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
628 | !is_multicast_ether_addr(hdr->addr1)) |
629 | rx->key = NULL; | |
571ecf67 JB |
630 | } |
631 | ||
3017b80b | 632 | if (rx->key) { |
571ecf67 | 633 | rx->key->tx_rx_count++; |
011bfcc4 | 634 | /* TODO: add threshold stuff again */ |
1990af8d | 635 | } else { |
e4c26add | 636 | return RX_DROP_MONITOR; |
70f08765 JB |
637 | } |
638 | ||
1990af8d JB |
639 | /* Check for weak IVs if possible */ |
640 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 641 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
642 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
643 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
644 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
645 | rx->sta->wep_weak_iv_count++; | |
646 | ||
70f08765 JB |
647 | switch (rx->key->conf.alg) { |
648 | case ALG_WEP: | |
e2f036da MN |
649 | result = ieee80211_crypto_wep_decrypt(rx); |
650 | break; | |
70f08765 | 651 | case ALG_TKIP: |
e2f036da MN |
652 | result = ieee80211_crypto_tkip_decrypt(rx); |
653 | break; | |
70f08765 | 654 | case ALG_CCMP: |
e2f036da MN |
655 | result = ieee80211_crypto_ccmp_decrypt(rx); |
656 | break; | |
70f08765 JB |
657 | } |
658 | ||
e2f036da | 659 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 660 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
661 | |
662 | return result; | |
70f08765 JB |
663 | } |
664 | ||
133b8226 | 665 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 666 | { |
133b8226 | 667 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 668 | struct ieee80211_local *local = sdata->local; |
0795af57 | 669 | |
3e122be0 | 670 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 671 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
89fad578 CL |
672 | if (local->ops->sta_notify) |
673 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
674 | STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 675 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
676 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
677 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
678 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
679 | } | |
680 | ||
133b8226 | 681 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 682 | { |
133b8226 JB |
683 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
684 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
685 | struct sk_buff *skb; |
686 | int sent = 0; | |
571ecf67 | 687 | |
3e122be0 | 688 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 689 | |
07346f81 | 690 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
89fad578 CL |
691 | if (local->ops->sta_notify) |
692 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
693 | STA_NOTIFY_AWAKE, &sta->sta); | |
004c872e JB |
694 | |
695 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
696 | sta_info_clear_tim_bit(sta); | |
697 | ||
571ecf67 | 698 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
699 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
700 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 701 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 702 | |
571ecf67 JB |
703 | /* Send all buffered frames to the station */ |
704 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 705 | sent++; |
8b30b1fe | 706 | skb->requeue = 1; |
571ecf67 JB |
707 | dev_queue_xmit(skb); |
708 | } | |
709 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
710 | local->total_ps_buffered--; |
711 | sent++; | |
712 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 713 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 714 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 715 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 716 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 717 | skb->requeue = 1; |
571ecf67 JB |
718 | dev_queue_xmit(skb); |
719 | } | |
720 | ||
721 | return sent; | |
722 | } | |
723 | ||
49461622 | 724 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 725 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
726 | { |
727 | struct sta_info *sta = rx->sta; | |
a7767f95 | 728 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
729 | |
730 | if (!sta) | |
9ae54c84 | 731 | return RX_CONTINUE; |
571ecf67 JB |
732 | |
733 | /* Update last_rx only for IBSS packets which are for the current | |
734 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
735 | * other STAs are using different BSSID. */ | |
05c914fe | 736 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 737 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 738 | NL80211_IFTYPE_ADHOC); |
571ecf67 JB |
739 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
740 | sta->last_rx = jiffies; | |
741 | } else | |
742 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 743 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
744 | /* Update last_rx only for unicast frames in order to prevent |
745 | * the Probe Request frames (the only broadcast frames from a | |
746 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
747 | * Mesh beacons will update last_rx when if they are found to |
748 | * match the current local configuration when processed. | |
571ecf67 JB |
749 | */ |
750 | sta->last_rx = jiffies; | |
751 | } | |
752 | ||
5cf121c3 | 753 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 754 | return RX_CONTINUE; |
571ecf67 JB |
755 | |
756 | sta->rx_fragments++; | |
757 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 758 | sta->last_signal = rx->status->signal; |
566bfe5a | 759 | sta->last_qual = rx->status->qual; |
5cf121c3 | 760 | sta->last_noise = rx->status->noise; |
571ecf67 | 761 | |
72eaa43a JB |
762 | /* |
763 | * Change STA power saving mode only at the end of a frame | |
764 | * exchange sequence. | |
765 | */ | |
3e122be0 | 766 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
767 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
768 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
769 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
770 | /* | |
771 | * Ignore doze->wake transitions that are | |
772 | * indicated by non-data frames, the standard | |
773 | * is unclear here, but for example going to | |
774 | * PS mode and then scanning would cause a | |
775 | * doze->wake transition for the probe request, | |
776 | * and that is clearly undesirable. | |
777 | */ | |
778 | if (ieee80211_is_data(hdr->frame_control) && | |
779 | !ieee80211_has_pm(hdr->frame_control)) | |
780 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
781 | } else { | |
782 | if (ieee80211_has_pm(hdr->frame_control)) | |
783 | ap_sta_ps_start(sta); | |
784 | } | |
571ecf67 JB |
785 | } |
786 | ||
787 | /* Drop data::nullfunc frames silently, since they are used only to | |
788 | * control station power saving mode. */ | |
a7767f95 | 789 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
790 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
791 | /* Update counter and free packet here to avoid counting this | |
792 | * as a dropped packed. */ | |
793 | sta->rx_packets++; | |
794 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 795 | return RX_QUEUED; |
571ecf67 JB |
796 | } |
797 | ||
9ae54c84 | 798 | return RX_CONTINUE; |
571ecf67 JB |
799 | } /* ieee80211_rx_h_sta_process */ |
800 | ||
571ecf67 JB |
801 | static inline struct ieee80211_fragment_entry * |
802 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
803 | unsigned int frag, unsigned int seq, int rx_queue, | |
804 | struct sk_buff **skb) | |
805 | { | |
806 | struct ieee80211_fragment_entry *entry; | |
807 | int idx; | |
808 | ||
809 | idx = sdata->fragment_next; | |
810 | entry = &sdata->fragments[sdata->fragment_next++]; | |
811 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
812 | sdata->fragment_next = 0; | |
813 | ||
814 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 815 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
816 | struct ieee80211_hdr *hdr = |
817 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
818 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
819 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 820 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
821 | sdata->dev->name, idx, |
822 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 823 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 824 | #endif |
571ecf67 JB |
825 | __skb_queue_purge(&entry->skb_list); |
826 | } | |
827 | ||
828 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
829 | *skb = NULL; | |
830 | entry->first_frag_time = jiffies; | |
831 | entry->seq = seq; | |
832 | entry->rx_queue = rx_queue; | |
833 | entry->last_frag = frag; | |
834 | entry->ccmp = 0; | |
835 | entry->extra_len = 0; | |
836 | ||
837 | return entry; | |
838 | } | |
839 | ||
840 | static inline struct ieee80211_fragment_entry * | |
841 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 842 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
843 | int rx_queue, struct ieee80211_hdr *hdr) |
844 | { | |
845 | struct ieee80211_fragment_entry *entry; | |
846 | int i, idx; | |
847 | ||
848 | idx = sdata->fragment_next; | |
849 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
850 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
851 | |
852 | idx--; | |
853 | if (idx < 0) | |
854 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
855 | ||
856 | entry = &sdata->fragments[idx]; | |
857 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
858 | entry->rx_queue != rx_queue || | |
859 | entry->last_frag + 1 != frag) | |
860 | continue; | |
861 | ||
b73d70ad | 862 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 863 | |
b73d70ad HH |
864 | /* |
865 | * Check ftype and addresses are equal, else check next fragment | |
866 | */ | |
867 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
868 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
869 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
870 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
871 | continue; | |
872 | ||
ab46623e | 873 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
874 | __skb_queue_purge(&entry->skb_list); |
875 | continue; | |
876 | } | |
877 | return entry; | |
878 | } | |
879 | ||
880 | return NULL; | |
881 | } | |
882 | ||
49461622 | 883 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 884 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
885 | { |
886 | struct ieee80211_hdr *hdr; | |
887 | u16 sc; | |
358c8d9d | 888 | __le16 fc; |
571ecf67 JB |
889 | unsigned int frag, seq; |
890 | struct ieee80211_fragment_entry *entry; | |
891 | struct sk_buff *skb; | |
892 | ||
b73d70ad | 893 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 894 | fc = hdr->frame_control; |
571ecf67 JB |
895 | sc = le16_to_cpu(hdr->seq_ctrl); |
896 | frag = sc & IEEE80211_SCTL_FRAG; | |
897 | ||
358c8d9d | 898 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
899 | (rx->skb)->len < 24 || |
900 | is_multicast_ether_addr(hdr->addr1))) { | |
901 | /* not fragmented */ | |
902 | goto out; | |
903 | } | |
904 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
905 | ||
906 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
907 | ||
908 | if (frag == 0) { | |
909 | /* This is the first fragment of a new frame. */ | |
910 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 911 | rx->queue, &(rx->skb)); |
8f20fc24 | 912 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 913 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
914 | /* Store CCMP PN so that we can verify that the next |
915 | * fragment has a sequential PN value. */ | |
916 | entry->ccmp = 1; | |
917 | memcpy(entry->last_pn, | |
5cf121c3 | 918 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
919 | CCMP_PN_LEN); |
920 | } | |
9ae54c84 | 921 | return RX_QUEUED; |
571ecf67 JB |
922 | } |
923 | ||
924 | /* This is a fragment for a frame that should already be pending in | |
925 | * fragment cache. Add this fragment to the end of the pending entry. | |
926 | */ | |
b73d70ad | 927 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
928 | if (!entry) { |
929 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 930 | return RX_DROP_MONITOR; |
571ecf67 JB |
931 | } |
932 | ||
933 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
934 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
935 | if (entry->ccmp) { | |
936 | int i; | |
937 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 938 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 939 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
940 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
941 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
942 | pn[i]++; | |
943 | if (pn[i]) | |
944 | break; | |
945 | } | |
5cf121c3 | 946 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 947 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 948 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
949 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
950 | } | |
951 | ||
358c8d9d | 952 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
953 | __skb_queue_tail(&entry->skb_list, rx->skb); |
954 | entry->last_frag = frag; | |
955 | entry->extra_len += rx->skb->len; | |
358c8d9d | 956 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 957 | rx->skb = NULL; |
9ae54c84 | 958 | return RX_QUEUED; |
571ecf67 JB |
959 | } |
960 | ||
961 | rx->skb = __skb_dequeue(&entry->skb_list); | |
962 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
963 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
964 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
965 | GFP_ATOMIC))) { | |
966 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
967 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 968 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
969 | } |
970 | } | |
971 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
972 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
973 | dev_kfree_skb(skb); | |
974 | } | |
975 | ||
976 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 977 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
978 | |
979 | out: | |
980 | if (rx->sta) | |
981 | rx->sta->rx_packets++; | |
982 | if (is_multicast_ether_addr(hdr->addr1)) | |
983 | rx->local->dot11MulticastReceivedFrameCount++; | |
984 | else | |
985 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 986 | return RX_CONTINUE; |
571ecf67 JB |
987 | } |
988 | ||
49461622 | 989 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 990 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 991 | { |
98f0b0a3 | 992 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
993 | struct sk_buff *skb; |
994 | int no_pending_pkts; | |
358c8d9d | 995 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 996 | |
358c8d9d | 997 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 998 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 999 | return RX_CONTINUE; |
571ecf67 | 1000 | |
05c914fe JB |
1001 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1002 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1003 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1004 | |
571ecf67 JB |
1005 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1006 | if (!skb) { | |
1007 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1008 | if (skb) | |
1009 | rx->local->total_ps_buffered--; | |
1010 | } | |
1011 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1012 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1013 | ||
1014 | if (skb) { | |
1015 | struct ieee80211_hdr *hdr = | |
1016 | (struct ieee80211_hdr *) skb->data; | |
1017 | ||
4a9a66e9 JB |
1018 | /* |
1019 | * Tell TX path to send one frame even though the STA may | |
1020 | * still remain is PS mode after this frame exchange. | |
1021 | */ | |
07346f81 | 1022 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1023 | |
1024 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1025 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1026 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1027 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1028 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1029 | ||
1030 | /* Use MoreData flag to indicate whether there are more | |
1031 | * buffered frames for this STA */ | |
836341a7 | 1032 | if (no_pending_pkts) |
571ecf67 | 1033 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1034 | else |
571ecf67 JB |
1035 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1036 | ||
1037 | dev_queue_xmit(skb); | |
1038 | ||
004c872e JB |
1039 | if (no_pending_pkts) |
1040 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1041 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1042 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1043 | /* |
1044 | * FIXME: This can be the result of a race condition between | |
1045 | * us expiring a frame and the station polling for it. | |
1046 | * Should we send it a null-func frame indicating we | |
1047 | * have nothing buffered for it? | |
1048 | */ | |
0c68ae26 | 1049 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1050 | "though there are no buffered frames for it\n", |
0c68ae26 | 1051 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1052 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1053 | } |
1054 | ||
9ae54c84 | 1055 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1056 | * count as an dropped frame. */ |
1057 | dev_kfree_skb(rx->skb); | |
1058 | ||
9ae54c84 | 1059 | return RX_QUEUED; |
571ecf67 JB |
1060 | } |
1061 | ||
49461622 | 1062 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1063 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1064 | { |
6e0d114d | 1065 | u8 *data = rx->skb->data; |
238f74a2 | 1066 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1067 | |
238f74a2 | 1068 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1069 | return RX_CONTINUE; |
6e0d114d JB |
1070 | |
1071 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1072 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1073 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1074 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1075 | /* change frame type to non QOS */ |
238f74a2 | 1076 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1077 | |
9ae54c84 | 1078 | return RX_CONTINUE; |
6e0d114d JB |
1079 | } |
1080 | ||
76ee65bf | 1081 | static int |
5cf121c3 | 1082 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1083 | { |
07346f81 | 1084 | if (unlikely(!rx->sta || |
f4ea83dd | 1085 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1086 | return -EACCES; |
571ecf67 | 1087 | |
76ee65bf | 1088 | return 0; |
571ecf67 JB |
1089 | } |
1090 | ||
76ee65bf | 1091 | static int |
358c8d9d | 1092 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1093 | { |
3017b80b | 1094 | /* |
7848ba7d JB |
1095 | * Pass through unencrypted frames if the hardware has |
1096 | * decrypted them already. | |
3017b80b | 1097 | */ |
5cf121c3 | 1098 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1099 | return 0; |
571ecf67 JB |
1100 | |
1101 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1102 | if (unlikely(!ieee80211_has_protected(fc) && |
1103 | !ieee80211_is_nullfunc(fc) && | |
b3fc9c6c | 1104 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1105 | return -EACCES; |
b3fc9c6c | 1106 | |
76ee65bf | 1107 | return 0; |
571ecf67 JB |
1108 | } |
1109 | ||
76ee65bf | 1110 | static int |
5cf121c3 | 1111 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1112 | { |
1113 | struct net_device *dev = rx->dev; | |
571ecf67 | 1114 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1115 | u16 hdrlen, ethertype; |
571ecf67 JB |
1116 | u8 *payload; |
1117 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1118 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1119 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1120 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1121 | ||
b73d70ad | 1122 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1123 | return -1; |
571ecf67 | 1124 | |
b73d70ad | 1125 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1126 | |
1127 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1128 | * header | |
1129 | * IEEE 802.11 address fields: | |
1130 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1131 | * 0 0 DA SA BSSID n/a | |
1132 | * 0 1 DA BSSID SA n/a | |
1133 | * 1 0 BSSID SA DA n/a | |
1134 | * 1 1 RA TA DA SA | |
1135 | */ | |
b73d70ad HH |
1136 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1137 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1138 | |
b73d70ad HH |
1139 | switch (hdr->frame_control & |
1140 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1141 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS): | |
05c914fe JB |
1142 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1143 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1144 | return -1; |
571ecf67 | 1145 | break; |
b73d70ad | 1146 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1147 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1148 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1149 | return -1; |
79617dee Y |
1150 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1151 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1152 | (skb->data + hdrlen); | |
1153 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1154 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1155 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1156 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1157 | } | |
1158 | } | |
571ecf67 | 1159 | break; |
b73d70ad | 1160 | case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1161 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1162 | (is_multicast_ether_addr(dst) && |
1163 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1164 | return -1; |
571ecf67 | 1165 | break; |
b73d70ad | 1166 | case __constant_cpu_to_le16(0): |
05c914fe | 1167 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1168 | return -1; |
571ecf67 JB |
1169 | break; |
1170 | } | |
1171 | ||
f4ea83dd | 1172 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1173 | return -1; |
571ecf67 | 1174 | |
76ee65bf | 1175 | payload = skb->data + hdrlen; |
571ecf67 JB |
1176 | ethertype = (payload[6] << 8) | payload[7]; |
1177 | ||
1178 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1179 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1180 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1181 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1182 | * replace EtherType */ | |
1183 | skb_pull(skb, hdrlen + 6); | |
1184 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1185 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1186 | } else { | |
1187 | struct ethhdr *ehdr; | |
1188 | __be16 len; | |
ce3edf6d | 1189 | |
571ecf67 JB |
1190 | skb_pull(skb, hdrlen); |
1191 | len = htons(skb->len); | |
1192 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1193 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1194 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1195 | ehdr->h_proto = len; | |
1196 | } | |
76ee65bf RR |
1197 | return 0; |
1198 | } | |
571ecf67 | 1199 | |
ce3edf6d JB |
1200 | /* |
1201 | * requires that rx->skb is a frame with ethernet header | |
1202 | */ | |
358c8d9d | 1203 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1204 | { |
c97c23e3 | 1205 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1206 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1207 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1208 | ||
1209 | /* | |
1210 | * Allow EAPOL frames to us/the PAE group address regardless | |
1211 | * of whether the frame was encrypted or not. | |
1212 | */ | |
1213 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1214 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1215 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1216 | return true; | |
1217 | ||
1218 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1219 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1220 | return false; |
1221 | ||
1222 | return true; | |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * requires that rx->skb is a frame with ethernet header | |
1227 | */ | |
76ee65bf | 1228 | static void |
5cf121c3 | 1229 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1230 | { |
1231 | struct net_device *dev = rx->dev; | |
1232 | struct ieee80211_local *local = rx->local; | |
1233 | struct sk_buff *skb, *xmit_skb; | |
1234 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1235 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1236 | struct sta_info *dsta; | |
571ecf67 | 1237 | |
76ee65bf RR |
1238 | skb = rx->skb; |
1239 | xmit_skb = NULL; | |
571ecf67 | 1240 | |
05c914fe JB |
1241 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1242 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1243 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1244 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1245 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1246 | /* | |
1247 | * send multicast frames both to higher layers in | |
1248 | * local net stack and back to the wireless medium | |
1249 | */ | |
76ee65bf RR |
1250 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1251 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1252 | printk(KERN_DEBUG "%s: failed to clone " |
1253 | "multicast frame\n", dev->name); | |
1254 | } else { | |
571ecf67 | 1255 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1256 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1257 | /* |
1258 | * The destination station is associated to | |
1259 | * this AP (in this VLAN), so send the frame | |
1260 | * directly to it and do not pass it to local | |
1261 | * net stack. | |
571ecf67 | 1262 | */ |
76ee65bf | 1263 | xmit_skb = skb; |
571ecf67 JB |
1264 | skb = NULL; |
1265 | } | |
571ecf67 JB |
1266 | } |
1267 | } | |
1268 | ||
1269 | if (skb) { | |
1270 | /* deliver to local stack */ | |
1271 | skb->protocol = eth_type_trans(skb, dev); | |
1272 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1273 | netif_rx(skb); | |
1274 | } | |
1275 | ||
76ee65bf | 1276 | if (xmit_skb) { |
571ecf67 | 1277 | /* send to wireless media */ |
f831e909 | 1278 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1279 | skb_reset_network_header(xmit_skb); |
1280 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1281 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1282 | } |
76ee65bf RR |
1283 | } |
1284 | ||
49461622 | 1285 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1286 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1287 | { |
1288 | struct net_device *dev = rx->dev; | |
1289 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1290 | u16 ethertype; |
fd4c7f2f RR |
1291 | u8 *payload; |
1292 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1293 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1294 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1295 | const struct ethhdr *eth; |
1296 | int remaining, err; | |
1297 | u8 dst[ETH_ALEN]; | |
1298 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1299 | |
358c8d9d | 1300 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1301 | return RX_CONTINUE; |
fd4c7f2f | 1302 | |
358c8d9d | 1303 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1304 | return RX_DROP_MONITOR; |
fd4c7f2f | 1305 | |
5cf121c3 | 1306 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1307 | return RX_CONTINUE; |
fd4c7f2f RR |
1308 | |
1309 | err = ieee80211_data_to_8023(rx); | |
1310 | if (unlikely(err)) | |
e4c26add | 1311 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1312 | |
1313 | skb->dev = dev; | |
1314 | ||
1315 | dev->stats.rx_packets++; | |
1316 | dev->stats.rx_bytes += skb->len; | |
1317 | ||
1318 | /* skip the wrapping header */ | |
1319 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1320 | if (!eth) | |
e4c26add | 1321 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1322 | |
1323 | while (skb != frame) { | |
1324 | u8 padding; | |
1325 | __be16 len = eth->h_proto; | |
1326 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1327 | ||
1328 | remaining = skb->len; | |
1329 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1330 | memcpy(src, eth->h_source, ETH_ALEN); | |
1331 | ||
1332 | padding = ((4 - subframe_len) & 0x3); | |
1333 | /* the last MSDU has no padding */ | |
f4ea83dd | 1334 | if (subframe_len > remaining) |
e4c26add | 1335 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1336 | |
1337 | skb_pull(skb, sizeof(struct ethhdr)); | |
1338 | /* if last subframe reuse skb */ | |
1339 | if (remaining <= subframe_len + padding) | |
1340 | frame = skb; | |
1341 | else { | |
1342 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1343 | subframe_len); | |
1344 | ||
1345 | if (frame == NULL) | |
e4c26add | 1346 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1347 | |
1348 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1349 | sizeof(struct ethhdr)); | |
1350 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1351 | ntohs(len)); | |
1352 | ||
1353 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1354 | padding); | |
1355 | if (!eth) { | |
fd4c7f2f | 1356 | dev_kfree_skb(frame); |
e4c26add | 1357 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1358 | } |
1359 | } | |
1360 | ||
ce3edf6d | 1361 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1362 | frame->dev = dev; |
1363 | frame->priority = skb->priority; | |
1364 | rx->skb = frame; | |
1365 | ||
fd4c7f2f RR |
1366 | payload = frame->data; |
1367 | ethertype = (payload[6] << 8) | payload[7]; | |
1368 | ||
1369 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1370 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1371 | compare_ether_addr(payload, | |
1372 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1373 | /* remove RFC1042 or Bridge-Tunnel |
1374 | * encapsulation and replace EtherType */ | |
1375 | skb_pull(frame, 6); | |
1376 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1377 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1378 | } else { | |
ce3edf6d JB |
1379 | memcpy(skb_push(frame, sizeof(__be16)), |
1380 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1381 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1382 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1383 | } | |
1384 | ||
358c8d9d | 1385 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1386 | if (skb == frame) /* last frame */ |
e4c26add | 1387 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1388 | dev_kfree_skb(frame); |
1389 | continue; | |
1390 | } | |
fd4c7f2f RR |
1391 | |
1392 | ieee80211_deliver_skb(rx); | |
1393 | } | |
1394 | ||
9ae54c84 | 1395 | return RX_QUEUED; |
fd4c7f2f RR |
1396 | } |
1397 | ||
bf94e17b | 1398 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1399 | static ieee80211_rx_result |
e32f85f7 LCC |
1400 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1401 | { | |
1402 | struct ieee80211_hdr *hdr; | |
1403 | struct ieee80211s_hdr *mesh_hdr; | |
1404 | unsigned int hdrlen; | |
1405 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1406 | ||
1407 | hdr = (struct ieee80211_hdr *) skb->data; | |
1408 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1409 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1410 | ||
1411 | if (!ieee80211_is_data(hdr->frame_control)) | |
1412 | return RX_CONTINUE; | |
1413 | ||
1414 | if (!mesh_hdr->ttl) | |
1415 | /* illegal frame */ | |
1416 | return RX_DROP_MONITOR; | |
1417 | ||
79617dee Y |
1418 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1419 | struct ieee80211_sub_if_data *sdata; | |
1420 | struct mesh_path *mppath; | |
1421 | ||
1422 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1423 | rcu_read_lock(); | |
1424 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1425 | if (!mppath) { | |
1426 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1427 | } else { | |
1428 | spin_lock_bh(&mppath->state_lock); | |
1429 | mppath->exp_time = jiffies; | |
1430 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1431 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1432 | spin_unlock_bh(&mppath->state_lock); | |
1433 | } | |
1434 | rcu_read_unlock(); | |
1435 | } | |
1436 | ||
e32f85f7 LCC |
1437 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1438 | return RX_CONTINUE; | |
1439 | ||
1440 | mesh_hdr->ttl--; | |
1441 | ||
1442 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1443 | if (!mesh_hdr->ttl) | |
472dbc45 | 1444 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1445 | dropped_frames_ttl); |
1446 | else { | |
1447 | struct ieee80211_hdr *fwd_hdr; | |
1448 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1449 | ||
1450 | if (!fwd_skb && net_ratelimit()) | |
1451 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1452 | rx->dev->name); | |
1453 | ||
1454 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1455 | /* | |
1456 | * Save TA to addr1 to send TA a path error if a | |
1457 | * suitable next hop is not found | |
1458 | */ | |
1459 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1460 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1461 | fwd_skb->dev = rx->local->mdev; | |
1462 | fwd_skb->iif = rx->dev->ifindex; | |
1463 | dev_queue_xmit(fwd_skb); | |
1464 | } | |
1465 | } | |
1466 | ||
1467 | if (is_multicast_ether_addr(hdr->addr3) || | |
1468 | rx->dev->flags & IFF_PROMISC) | |
1469 | return RX_CONTINUE; | |
1470 | else | |
1471 | return RX_DROP_MONITOR; | |
1472 | } | |
bf94e17b | 1473 | #endif |
e32f85f7 | 1474 | |
49461622 | 1475 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1476 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1477 | { |
1478 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1479 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1480 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1481 | int err; |
76ee65bf | 1482 | |
358c8d9d | 1483 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1484 | return RX_CONTINUE; |
76ee65bf | 1485 | |
358c8d9d | 1486 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1487 | return RX_DROP_MONITOR; |
76ee65bf | 1488 | |
76ee65bf RR |
1489 | err = ieee80211_data_to_8023(rx); |
1490 | if (unlikely(err)) | |
e4c26add | 1491 | return RX_DROP_UNUSABLE; |
76ee65bf | 1492 | |
358c8d9d | 1493 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1494 | return RX_DROP_MONITOR; |
ce3edf6d | 1495 | |
76ee65bf RR |
1496 | rx->skb->dev = dev; |
1497 | ||
1498 | dev->stats.rx_packets++; | |
1499 | dev->stats.rx_bytes += rx->skb->len; | |
1500 | ||
1501 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1502 | |
9ae54c84 | 1503 | return RX_QUEUED; |
571ecf67 JB |
1504 | } |
1505 | ||
49461622 | 1506 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1507 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1508 | { |
1509 | struct ieee80211_local *local = rx->local; | |
1510 | struct ieee80211_hw *hw = &local->hw; | |
1511 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1512 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1513 | struct tid_ampdu_rx *tid_agg_rx; |
1514 | u16 start_seq_num; | |
1515 | u16 tid; | |
1516 | ||
a7767f95 | 1517 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1518 | return RX_CONTINUE; |
71364716 | 1519 | |
a7767f95 | 1520 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1521 | if (!rx->sta) |
9ae54c84 | 1522 | return RX_CONTINUE; |
71364716 | 1523 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1524 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1525 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1526 | return RX_CONTINUE; |
cee24a3e | 1527 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1528 | |
1529 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1530 | ||
1531 | /* reset session timer */ | |
1532 | if (tid_agg_rx->timeout) { | |
1533 | unsigned long expires = | |
1534 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1535 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1536 | } | |
1537 | ||
1538 | /* manage reordering buffer according to requested */ | |
1539 | /* sequence number */ | |
1540 | rcu_read_lock(); | |
1541 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1542 | start_seq_num, 1); | |
1543 | rcu_read_unlock(); | |
e4c26add | 1544 | return RX_DROP_UNUSABLE; |
71364716 RR |
1545 | } |
1546 | ||
9ae54c84 | 1547 | return RX_CONTINUE; |
71364716 RR |
1548 | } |
1549 | ||
de1ede7a JB |
1550 | static ieee80211_rx_result debug_noinline |
1551 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1552 | { | |
1553 | struct ieee80211_local *local = rx->local; | |
1554 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
c481ec97 | 1555 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
de1ede7a | 1556 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
c481ec97 | 1557 | struct ieee80211_bss *bss; |
de1ede7a JB |
1558 | int len = rx->skb->len; |
1559 | ||
1560 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1561 | return RX_CONTINUE; | |
1562 | ||
1563 | if (!rx->sta) | |
1564 | return RX_DROP_MONITOR; | |
1565 | ||
1566 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1567 | return RX_DROP_MONITOR; | |
1568 | ||
1569 | /* all categories we currently handle have action_code */ | |
1570 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1571 | return RX_DROP_MONITOR; | |
1572 | ||
de1ede7a JB |
1573 | switch (mgmt->u.action.category) { |
1574 | case WLAN_CATEGORY_BACK: | |
1575 | switch (mgmt->u.action.u.addba_req.action_code) { | |
1576 | case WLAN_ACTION_ADDBA_REQ: | |
1577 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1578 | sizeof(mgmt->u.action.u.addba_req))) | |
1579 | return RX_DROP_MONITOR; | |
1580 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1581 | break; | |
1582 | case WLAN_ACTION_ADDBA_RESP: | |
1583 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1584 | sizeof(mgmt->u.action.u.addba_resp))) | |
1585 | return RX_DROP_MONITOR; | |
1586 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1587 | break; | |
1588 | case WLAN_ACTION_DELBA: | |
1589 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1590 | sizeof(mgmt->u.action.u.delba))) | |
1591 | return RX_DROP_MONITOR; | |
1592 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1593 | break; | |
1594 | } | |
39192c0b JB |
1595 | break; |
1596 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1597 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1598 | return RX_DROP_MONITOR; | |
1599 | switch (mgmt->u.action.u.measurement.action_code) { | |
1600 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1601 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1602 | sizeof(mgmt->u.action.u.measurement))) | |
1603 | return RX_DROP_MONITOR; | |
1604 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1605 | break; | |
c481ec97 S |
1606 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1607 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1608 | sizeof(mgmt->u.action.u.chan_switch))) | |
1609 | return RX_DROP_MONITOR; | |
1610 | ||
1611 | if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0) | |
1612 | return RX_DROP_MONITOR; | |
1613 | ||
1614 | bss = ieee80211_rx_bss_get(local, ifsta->bssid, | |
1615 | local->hw.conf.channel->center_freq, | |
1616 | ifsta->ssid, ifsta->ssid_len); | |
1617 | if (!bss) | |
1618 | return RX_DROP_MONITOR; | |
1619 | ||
1620 | ieee80211_process_chanswitch(sdata, | |
1621 | &mgmt->u.action.u.chan_switch.sw_elem, bss); | |
1622 | ieee80211_rx_bss_put(local, bss); | |
1623 | break; | |
39192c0b JB |
1624 | } |
1625 | break; | |
1626 | default: | |
1627 | return RX_CONTINUE; | |
de1ede7a JB |
1628 | } |
1629 | ||
39192c0b JB |
1630 | rx->sta->rx_packets++; |
1631 | dev_kfree_skb(rx->skb); | |
1632 | return RX_QUEUED; | |
de1ede7a JB |
1633 | } |
1634 | ||
49461622 | 1635 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1636 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1637 | { |
759ef3eb | 1638 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 | 1639 | |
5cf121c3 | 1640 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1641 | return RX_DROP_MONITOR; |
571ecf67 | 1642 | |
472dbc45 JB |
1643 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1644 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1645 | ||
05c914fe JB |
1646 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
1647 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
759ef3eb JB |
1648 | return RX_DROP_MONITOR; |
1649 | ||
1650 | if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME) | |
e4c26add | 1651 | return RX_DROP_MONITOR; |
f9d540ee | 1652 | |
759ef3eb | 1653 | ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
9ae54c84 | 1654 | return RX_QUEUED; |
571ecf67 JB |
1655 | } |
1656 | ||
571ecf67 JB |
1657 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1658 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1659 | struct ieee80211_rx_data *rx) |
571ecf67 | 1660 | { |
a7767f95 HH |
1661 | int keyidx; |
1662 | unsigned int hdrlen; | |
571ecf67 | 1663 | |
a7767f95 | 1664 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1665 | if (rx->skb->len >= hdrlen + 4) |
1666 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1667 | else | |
1668 | keyidx = -1; | |
1669 | ||
8944b79f | 1670 | if (!rx->sta) { |
aa0daf0e JB |
1671 | /* |
1672 | * Some hardware seem to generate incorrect Michael MIC | |
1673 | * reports; ignore them to avoid triggering countermeasures. | |
1674 | */ | |
571ecf67 JB |
1675 | goto ignore; |
1676 | } | |
1677 | ||
a7767f95 | 1678 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1679 | goto ignore; |
571ecf67 | 1680 | |
05c914fe | 1681 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1682 | /* |
1683 | * APs with pairwise keys should never receive Michael MIC | |
1684 | * errors for non-zero keyidx because these are reserved for | |
1685 | * group keys and only the AP is sending real multicast | |
1686 | * frames in the BSS. | |
1687 | */ | |
eb063c17 | 1688 | goto ignore; |
571ecf67 JB |
1689 | } |
1690 | ||
a7767f95 HH |
1691 | if (!ieee80211_is_data(hdr->frame_control) && |
1692 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1693 | goto ignore; |
571ecf67 | 1694 | |
f698d856 | 1695 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1696 | ignore: |
1697 | dev_kfree_skb(rx->skb); | |
1698 | rx->skb = NULL; | |
1699 | } | |
1700 | ||
5cf121c3 JB |
1701 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1702 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1703 | { |
1704 | struct ieee80211_sub_if_data *sdata; | |
1705 | struct ieee80211_local *local = rx->local; | |
1706 | struct ieee80211_rtap_hdr { | |
1707 | struct ieee80211_radiotap_header hdr; | |
1708 | u8 flags; | |
1709 | u8 rate; | |
1710 | __le16 chan_freq; | |
1711 | __le16 chan_flags; | |
1712 | } __attribute__ ((packed)) *rthdr; | |
1713 | struct sk_buff *skb = rx->skb, *skb2; | |
1714 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1715 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1716 | |
5cf121c3 | 1717 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1718 | goto out_free_skb; |
1719 | ||
1720 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1721 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1722 | goto out_free_skb; | |
1723 | ||
1724 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1725 | memset(rthdr, 0, sizeof(*rthdr)); | |
1726 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1727 | rthdr->hdr.it_present = | |
1728 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1729 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1730 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1731 | ||
5cf121c3 | 1732 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1733 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1734 | ||
1735 | if (status->band == IEEE80211_BAND_5GHZ) | |
1736 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1737 | IEEE80211_CHAN_5GHZ); | |
1738 | else | |
1739 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1740 | IEEE80211_CHAN_2GHZ); | |
1741 | ||
1742 | skb_set_mac_header(skb, 0); | |
1743 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1744 | skb->pkt_type = PACKET_OTHERHOST; | |
1745 | skb->protocol = htons(ETH_P_802_2); | |
1746 | ||
1747 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1748 | if (!netif_running(sdata->dev)) | |
1749 | continue; | |
1750 | ||
05c914fe | 1751 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1752 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1753 | continue; | |
1754 | ||
1755 | if (prev_dev) { | |
1756 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1757 | if (skb2) { | |
1758 | skb2->dev = prev_dev; | |
1759 | netif_rx(skb2); | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | prev_dev = sdata->dev; | |
1764 | sdata->dev->stats.rx_packets++; | |
1765 | sdata->dev->stats.rx_bytes += skb->len; | |
1766 | } | |
1767 | ||
1768 | if (prev_dev) { | |
1769 | skb->dev = prev_dev; | |
1770 | netif_rx(skb); | |
1771 | skb = NULL; | |
1772 | } else | |
1773 | goto out_free_skb; | |
1774 | ||
5cf121c3 | 1775 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1776 | return; |
1777 | ||
1778 | out_free_skb: | |
1779 | dev_kfree_skb(skb); | |
1780 | } | |
1781 | ||
571ecf67 | 1782 | |
8944b79f | 1783 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1784 | struct ieee80211_rx_data *rx, |
8944b79f | 1785 | struct sk_buff *skb) |
58905290 | 1786 | { |
58905290 JB |
1787 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1788 | ||
8944b79f JB |
1789 | rx->skb = skb; |
1790 | rx->sdata = sdata; | |
1791 | rx->dev = sdata->dev; | |
1792 | ||
e32f85f7 LCC |
1793 | #define CALL_RXH(rxh) \ |
1794 | do { \ | |
1795 | res = rxh(rx); \ | |
1796 | if (res != RX_CONTINUE) \ | |
1797 | goto rxh_done; \ | |
1798 | } while (0); | |
49461622 JB |
1799 | |
1800 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1801 | CALL_RXH(ieee80211_rx_h_check) | |
1802 | CALL_RXH(ieee80211_rx_h_decrypt) | |
1803 | CALL_RXH(ieee80211_rx_h_sta_process) | |
1804 | CALL_RXH(ieee80211_rx_h_defragment) | |
1805 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1806 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1807 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1808 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1809 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1810 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1811 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1812 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1813 | #endif |
49461622 JB |
1814 | CALL_RXH(ieee80211_rx_h_data) |
1815 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1816 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1817 | CALL_RXH(ieee80211_rx_h_mgmt) |
1818 | ||
1819 | #undef CALL_RXH | |
1820 | ||
1821 | rxh_done: | |
58905290 JB |
1822 | switch (res) { |
1823 | case RX_DROP_MONITOR: | |
49461622 JB |
1824 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1825 | if (rx->sta) | |
1826 | rx->sta->rx_dropped++; | |
1827 | /* fall through */ | |
1828 | case RX_CONTINUE: | |
3d30d949 MW |
1829 | ieee80211_rx_cooked_monitor(rx); |
1830 | break; | |
58905290 | 1831 | case RX_DROP_UNUSABLE: |
49461622 JB |
1832 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1833 | if (rx->sta) | |
1834 | rx->sta->rx_dropped++; | |
58905290 JB |
1835 | dev_kfree_skb(rx->skb); |
1836 | break; | |
49461622 JB |
1837 | case RX_QUEUED: |
1838 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1839 | break; | |
58905290 JB |
1840 | } |
1841 | } | |
1842 | ||
571ecf67 JB |
1843 | /* main receive path */ |
1844 | ||
23a24def | 1845 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1846 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1847 | struct ieee80211_hdr *hdr) |
1848 | { | |
1849 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1850 | ||
51fb61e7 | 1851 | switch (sdata->vif.type) { |
05c914fe | 1852 | case NL80211_IFTYPE_STATION: |
23a24def JB |
1853 | if (!bssid) |
1854 | return 0; | |
1855 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1856 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1857 | return 0; |
5cf121c3 | 1858 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1859 | } else if (!multicast && |
1860 | compare_ether_addr(sdata->dev->dev_addr, | |
1861 | hdr->addr1) != 0) { | |
4150c572 | 1862 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1863 | return 0; |
5cf121c3 | 1864 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1865 | } |
1866 | break; | |
05c914fe | 1867 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
1868 | if (!bssid) |
1869 | return 0; | |
a7767f95 | 1870 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 1871 | return 1; |
87291c02 | 1872 | } |
9d9bf77d | 1873 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 1874 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1875 | return 0; |
5cf121c3 | 1876 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1877 | } else if (!multicast && |
1878 | compare_ether_addr(sdata->dev->dev_addr, | |
1879 | hdr->addr1) != 0) { | |
4150c572 | 1880 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1881 | return 0; |
5cf121c3 | 1882 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
1883 | } else if (!rx->sta) { |
1884 | int rate_idx; | |
1885 | if (rx->status->flag & RX_FLAG_HT) | |
1886 | rate_idx = 0; /* TODO: HT rates */ | |
1887 | else | |
1888 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 1889 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
1890 | BIT(rate_idx)); |
1891 | } | |
23a24def | 1892 | break; |
05c914fe | 1893 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
1894 | if (!multicast && |
1895 | compare_ether_addr(sdata->dev->dev_addr, | |
1896 | hdr->addr1) != 0) { | |
1897 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1898 | return 0; | |
1899 | ||
5cf121c3 | 1900 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1901 | } |
1902 | break; | |
05c914fe JB |
1903 | case NL80211_IFTYPE_AP_VLAN: |
1904 | case NL80211_IFTYPE_AP: | |
23a24def JB |
1905 | if (!bssid) { |
1906 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1907 | hdr->addr1)) | |
1908 | return 0; | |
1909 | } else if (!ieee80211_bssid_match(bssid, | |
1910 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1911 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1912 | return 0; |
5cf121c3 | 1913 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1914 | } |
23a24def | 1915 | break; |
05c914fe | 1916 | case NL80211_IFTYPE_WDS: |
a7767f95 | 1917 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
1918 | return 0; |
1919 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1920 | return 0; | |
1921 | break; | |
05c914fe | 1922 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
1923 | /* take everything */ |
1924 | break; | |
05c914fe JB |
1925 | case NL80211_IFTYPE_UNSPECIFIED: |
1926 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
1927 | /* should never get here */ |
1928 | WARN_ON(1); | |
1929 | break; | |
23a24def JB |
1930 | } |
1931 | ||
1932 | return 1; | |
1933 | } | |
1934 | ||
571ecf67 | 1935 | /* |
6368e4b1 RR |
1936 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1937 | * be called with rcu_read_lock protection. | |
571ecf67 | 1938 | */ |
71ebb4aa RR |
1939 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1940 | struct sk_buff *skb, | |
1941 | struct ieee80211_rx_status *status, | |
8318d78a | 1942 | struct ieee80211_rate *rate) |
571ecf67 JB |
1943 | { |
1944 | struct ieee80211_local *local = hw_to_local(hw); | |
1945 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1946 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1947 | struct ieee80211_rx_data rx; |
6368e4b1 | 1948 | int prepares; |
8e6f0032 JB |
1949 | struct ieee80211_sub_if_data *prev = NULL; |
1950 | struct sk_buff *skb_new; | |
1951 | u8 *bssid; | |
571ecf67 | 1952 | |
358c8d9d | 1953 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
1954 | memset(&rx, 0, sizeof(rx)); |
1955 | rx.skb = skb; | |
1956 | rx.local = local; | |
1957 | ||
5cf121c3 | 1958 | rx.status = status; |
5cf121c3 | 1959 | rx.rate = rate; |
72abd81b | 1960 | |
358c8d9d | 1961 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 1962 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1963 | |
8944b79f JB |
1964 | rx.sta = sta_info_get(local, hdr->addr2); |
1965 | if (rx.sta) { | |
d0709a65 JB |
1966 | rx.sdata = rx.sta->sdata; |
1967 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 1968 | } |
571ecf67 | 1969 | |
571ecf67 | 1970 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1971 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 1972 | return; |
571ecf67 JB |
1973 | } |
1974 | ||
c2b13452 | 1975 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 1976 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 1977 | |
38f3714d JB |
1978 | ieee80211_parse_qos(&rx); |
1979 | ieee80211_verify_ip_alignment(&rx); | |
1980 | ||
571ecf67 JB |
1981 | skb = rx.skb; |
1982 | ||
79010420 | 1983 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1984 | if (!netif_running(sdata->dev)) |
1985 | continue; | |
1986 | ||
05c914fe | 1987 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
1988 | continue; |
1989 | ||
51fb61e7 | 1990 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 1991 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 1992 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1993 | |
6368e4b1 | 1994 | if (!prepares) |
23a24def | 1995 | continue; |
8e6f0032 | 1996 | |
340e11f3 JB |
1997 | /* |
1998 | * frame is destined for this interface, but if it's not | |
1999 | * also for the previous one we handle that after the | |
2000 | * loop to avoid copying the SKB once too much | |
2001 | */ | |
2002 | ||
2003 | if (!prev) { | |
2004 | prev = sdata; | |
2005 | continue; | |
8e6f0032 | 2006 | } |
340e11f3 JB |
2007 | |
2008 | /* | |
2009 | * frame was destined for the previous interface | |
2010 | * so invoke RX handlers for it | |
2011 | */ | |
2012 | ||
2013 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2014 | if (!skb_new) { | |
2015 | if (net_ratelimit()) | |
2016 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2017 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2018 | wiphy_name(local->hw.wiphy), |
2019 | prev->dev->name); | |
340e11f3 JB |
2020 | continue; |
2021 | } | |
8944b79f | 2022 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2023 | prev = sdata; |
571ecf67 | 2024 | } |
a4b7d7bd | 2025 | if (prev) |
8944b79f | 2026 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2027 | else |
8e6f0032 | 2028 | dev_kfree_skb(skb); |
571ecf67 | 2029 | } |
6368e4b1 | 2030 | |
b580781e RR |
2031 | #define SEQ_MODULO 0x1000 |
2032 | #define SEQ_MASK 0xfff | |
2033 | ||
2034 | static inline int seq_less(u16 sq1, u16 sq2) | |
2035 | { | |
c6a1fa12 | 2036 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2037 | } |
2038 | ||
2039 | static inline u16 seq_inc(u16 sq) | |
2040 | { | |
c6a1fa12 | 2041 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2042 | } |
2043 | ||
2044 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2045 | { | |
c6a1fa12 | 2046 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2047 | } |
2048 | ||
2049 | ||
71364716 RR |
2050 | /* |
2051 | * As it function blongs to Rx path it must be called with | |
2052 | * the proper rcu_read_lock protection for its flow. | |
2053 | */ | |
c6a1fa12 JB |
2054 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2055 | struct tid_ampdu_rx *tid_agg_rx, | |
2056 | struct sk_buff *skb, | |
2057 | u16 mpdu_seq_num, | |
2058 | int bar_req) | |
b580781e RR |
2059 | { |
2060 | struct ieee80211_local *local = hw_to_local(hw); | |
2061 | struct ieee80211_rx_status status; | |
2062 | u16 head_seq_num, buf_size; | |
2063 | int index; | |
8318d78a JB |
2064 | struct ieee80211_supported_band *sband; |
2065 | struct ieee80211_rate *rate; | |
b580781e RR |
2066 | |
2067 | buf_size = tid_agg_rx->buf_size; | |
2068 | head_seq_num = tid_agg_rx->head_seq_num; | |
2069 | ||
2070 | /* frame with out of date sequence number */ | |
2071 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2072 | dev_kfree_skb(skb); | |
2073 | return 1; | |
2074 | } | |
2075 | ||
2076 | /* if frame sequence number exceeds our buffering window size or | |
2077 | * block Ack Request arrived - release stored frames */ | |
2078 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2079 | /* new head to the ordering buffer */ | |
2080 | if (bar_req) | |
2081 | head_seq_num = mpdu_seq_num; | |
2082 | else | |
2083 | head_seq_num = | |
2084 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2085 | /* release stored frames up to new head to stack */ | |
2086 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2087 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2088 | tid_agg_rx->ssn) | |
2089 | % tid_agg_rx->buf_size; | |
2090 | ||
2091 | if (tid_agg_rx->reorder_buf[index]) { | |
2092 | /* release the reordered frames to stack */ | |
2093 | memcpy(&status, | |
2094 | tid_agg_rx->reorder_buf[index]->cb, | |
2095 | sizeof(status)); | |
8318d78a | 2096 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2097 | if (status.flag & RX_FLAG_HT) { |
2098 | /* TODO: HT rates */ | |
2099 | rate = sband->bitrates; | |
2100 | } else { | |
2101 | rate = &sband->bitrates | |
2102 | [status.rate_idx]; | |
2103 | } | |
b580781e RR |
2104 | __ieee80211_rx_handle_packet(hw, |
2105 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2106 | &status, rate); |
b580781e RR |
2107 | tid_agg_rx->stored_mpdu_num--; |
2108 | tid_agg_rx->reorder_buf[index] = NULL; | |
2109 | } | |
2110 | tid_agg_rx->head_seq_num = | |
2111 | seq_inc(tid_agg_rx->head_seq_num); | |
2112 | } | |
2113 | if (bar_req) | |
2114 | return 1; | |
2115 | } | |
2116 | ||
2117 | /* now the new frame is always in the range of the reordering */ | |
2118 | /* buffer window */ | |
2119 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2120 | % tid_agg_rx->buf_size; | |
2121 | /* check if we already stored this frame */ | |
2122 | if (tid_agg_rx->reorder_buf[index]) { | |
2123 | dev_kfree_skb(skb); | |
2124 | return 1; | |
2125 | } | |
2126 | ||
2127 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2128 | /* release it immediately */ | |
2129 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2130 | tid_agg_rx->stored_mpdu_num == 0) { | |
2131 | tid_agg_rx->head_seq_num = | |
2132 | seq_inc(tid_agg_rx->head_seq_num); | |
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | /* put the frame in the reordering buffer */ | |
2137 | tid_agg_rx->reorder_buf[index] = skb; | |
2138 | tid_agg_rx->stored_mpdu_num++; | |
2139 | /* release the buffer until next missing frame */ | |
2140 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2141 | % tid_agg_rx->buf_size; | |
2142 | while (tid_agg_rx->reorder_buf[index]) { | |
2143 | /* release the reordered frame back to stack */ | |
2144 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2145 | sizeof(status)); | |
8318d78a | 2146 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2147 | if (status.flag & RX_FLAG_HT) |
2148 | rate = sband->bitrates; /* TODO: HT rates */ | |
2149 | else | |
2150 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2151 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2152 | &status, rate); |
b580781e RR |
2153 | tid_agg_rx->stored_mpdu_num--; |
2154 | tid_agg_rx->reorder_buf[index] = NULL; | |
2155 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2156 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2157 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2158 | } | |
2159 | return 1; | |
2160 | } | |
2161 | ||
71ebb4aa RR |
2162 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2163 | struct sk_buff *skb) | |
b580781e RR |
2164 | { |
2165 | struct ieee80211_hw *hw = &local->hw; | |
2166 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2167 | struct sta_info *sta; | |
2168 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2169 | u16 sc; |
b580781e | 2170 | u16 mpdu_seq_num; |
182503ab | 2171 | u8 ret = 0; |
b580781e RR |
2172 | int tid; |
2173 | ||
2174 | sta = sta_info_get(local, hdr->addr2); | |
2175 | if (!sta) | |
2176 | return ret; | |
2177 | ||
b580781e RR |
2178 | /* filter the QoS data rx stream according to |
2179 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2180 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2181 | goto end_reorder; |
2182 | ||
238f74a2 | 2183 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2184 | |
cee24a3e | 2185 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2186 | goto end_reorder; |
2187 | ||
cee24a3e RR |
2188 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2189 | ||
2560b6e2 EG |
2190 | /* qos null data frames are excluded */ |
2191 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2192 | goto end_reorder; |
2193 | ||
2194 | /* new un-ordered ampdu frame - process it */ | |
2195 | ||
2196 | /* reset session timer */ | |
2197 | if (tid_agg_rx->timeout) { | |
2198 | unsigned long expires = | |
2199 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2200 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2201 | } | |
2202 | ||
2203 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2204 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2205 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2206 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2207 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2208 | ret = 1; | |
2209 | goto end_reorder; | |
2210 | } | |
2211 | ||
2212 | /* according to mpdu sequence number deal with reordering buffer */ | |
2213 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2214 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2215 | mpdu_seq_num, 0); | |
d0709a65 | 2216 | end_reorder: |
b580781e RR |
2217 | return ret; |
2218 | } | |
2219 | ||
6368e4b1 RR |
2220 | /* |
2221 | * This is the receive path handler. It is called by a low level driver when an | |
2222 | * 802.11 MPDU is received from the hardware. | |
2223 | */ | |
2224 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2225 | struct ieee80211_rx_status *status) | |
2226 | { | |
2227 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2228 | struct ieee80211_rate *rate = NULL; |
2229 | struct ieee80211_supported_band *sband; | |
2230 | ||
2231 | if (status->band < 0 || | |
13d8fd2d | 2232 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2233 | WARN_ON(1); |
2234 | return; | |
2235 | } | |
2236 | ||
2237 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2238 | if (!sband) { |
8318d78a JB |
2239 | WARN_ON(1); |
2240 | return; | |
2241 | } | |
2242 | ||
0fb8ca45 JM |
2243 | if (status->flag & RX_FLAG_HT) { |
2244 | /* rate_idx is MCS index */ | |
2245 | if (WARN_ON(status->rate_idx < 0 || | |
2246 | status->rate_idx >= 76)) | |
2247 | return; | |
2248 | /* HT rates are not in the table - use the highest legacy rate | |
2249 | * for now since other parts of mac80211 may not yet be fully | |
2250 | * MCS aware. */ | |
2251 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2252 | } else { | |
2253 | if (WARN_ON(status->rate_idx < 0 || | |
2254 | status->rate_idx >= sband->n_bitrates)) | |
2255 | return; | |
2256 | rate = &sband->bitrates[status->rate_idx]; | |
2257 | } | |
6368e4b1 RR |
2258 | |
2259 | /* | |
2260 | * key references and virtual interfaces are protected using RCU | |
2261 | * and this requires that we are in a read-side RCU section during | |
2262 | * receive processing | |
2263 | */ | |
2264 | rcu_read_lock(); | |
2265 | ||
2266 | /* | |
2267 | * Frames with failed FCS/PLCP checksum are not returned, | |
2268 | * all other frames are returned without radiotap header | |
2269 | * if it was previously present. | |
2270 | * Also, frames with less than 16 bytes are dropped. | |
2271 | */ | |
8318d78a | 2272 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2273 | if (!skb) { |
2274 | rcu_read_unlock(); | |
2275 | return; | |
2276 | } | |
2277 | ||
b580781e | 2278 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2279 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2280 | |
2281 | rcu_read_unlock(); | |
2282 | } | |
571ecf67 JB |
2283 | EXPORT_SYMBOL(__ieee80211_rx); |
2284 | ||
2285 | /* This is a version of the rx handler that can be called from hard irq | |
2286 | * context. Post the skb on the queue and schedule the tasklet */ | |
2287 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2288 | struct ieee80211_rx_status *status) | |
2289 | { | |
2290 | struct ieee80211_local *local = hw_to_local(hw); | |
2291 | ||
2292 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2293 | ||
2294 | skb->dev = local->mdev; | |
2295 | /* copy status into skb->cb for use by tasklet */ | |
2296 | memcpy(skb->cb, status, sizeof(*status)); | |
2297 | skb->pkt_type = IEEE80211_RX_MSG; | |
2298 | skb_queue_tail(&local->skb_queue, skb); | |
2299 | tasklet_schedule(&local->tasklet); | |
2300 | } | |
2301 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |