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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) | | |
126 | (1 << IEEE80211_RADIOTAP_RATE) | | |
127 | (1 << IEEE80211_RADIOTAP_CHANNEL) | | |
128 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
129 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
130 | rthdr->it_len = cpu_to_le16(rtap_len); | |
131 | ||
132 | pos = (unsigned char *)(rthdr+1); | |
133 | ||
134 | /* the order of the following fields is important */ | |
135 | ||
136 | /* IEEE80211_RADIOTAP_TSFT */ | |
137 | if (status->flag & RX_FLAG_TSFT) { | |
138 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
139 | rthdr->it_present |= | |
140 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
141 | pos += 8; | |
142 | } | |
143 | ||
144 | /* IEEE80211_RADIOTAP_FLAGS */ | |
145 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
146 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
b4f28bbb BR |
147 | if (status->flag & RX_FLAG_SHORTPRE) |
148 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
149 | pos++; |
150 | ||
151 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
152 | if (status->flag & RX_FLAG_HT) { |
153 | /* | |
154 | * TODO: add following information into radiotap header once | |
155 | * suitable fields are defined for it: | |
156 | * - MCS index (status->rate_idx) | |
157 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
158 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
159 | */ | |
160 | *pos = 0; | |
161 | } else | |
162 | *pos = rate->bitrate / 5; | |
601ae7f2 BR |
163 | pos++; |
164 | ||
165 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
166 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
167 | pos += 2; | |
168 | if (status->band == IEEE80211_BAND_5GHZ) | |
169 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
170 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
171 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
172 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
173 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 174 | else |
9deb1ae5 | 175 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
176 | IEEE80211_CHAN_2GHZ); |
177 | pos += 2; | |
178 | ||
179 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
180 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
181 | *pos = status->signal; | |
182 | rthdr->it_present |= | |
183 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
184 | pos++; | |
185 | } | |
186 | ||
187 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
188 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
189 | *pos = status->noise; | |
190 | rthdr->it_present |= | |
191 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
192 | pos++; | |
193 | } | |
194 | ||
195 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
196 | ||
197 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
198 | *pos = status->antenna; | |
199 | pos++; | |
200 | ||
201 | /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */ | |
202 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) { | |
203 | *pos = status->signal; | |
204 | rthdr->it_present |= | |
205 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL); | |
206 | pos++; | |
207 | } | |
208 | ||
209 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
210 | ||
211 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
212 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
213 | if ((pos - (unsigned char *)rthdr) & 1) | |
214 | pos++; | |
215 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
216 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
217 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
218 | pos += 2; | |
219 | } | |
220 | ||
b2e7771e JB |
221 | /* |
222 | * This function copies a received frame to all monitor interfaces and | |
223 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
224 | * radiotap header the driver might have added. | |
225 | */ | |
226 | static struct sk_buff * | |
227 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
228 | struct ieee80211_rx_status *status, |
229 | struct ieee80211_rate *rate) | |
b2e7771e JB |
230 | { |
231 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 232 | int needed_headroom = 0; |
b2e7771e JB |
233 | struct sk_buff *skb, *skb2; |
234 | struct net_device *prev_dev = NULL; | |
235 | int present_fcs_len = 0; | |
236 | int rtap_len = 0; | |
237 | ||
238 | /* | |
239 | * First, we may need to make a copy of the skb because | |
240 | * (1) we need to modify it for radiotap (if not present), and | |
241 | * (2) the other RX handlers will modify the skb we got. | |
242 | * | |
243 | * We don't need to, of course, if we aren't going to return | |
244 | * the SKB because it has a bad FCS/PLCP checksum. | |
245 | */ | |
246 | if (status->flag & RX_FLAG_RADIOTAP) | |
247 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
248 | else | |
601ae7f2 BR |
249 | /* room for the radiotap header based on driver features */ |
250 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
251 | |
252 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
253 | present_fcs_len = FCS_LEN; | |
254 | ||
255 | if (!local->monitors) { | |
256 | if (should_drop_frame(status, origskb, present_fcs_len, | |
257 | rtap_len)) { | |
258 | dev_kfree_skb(origskb); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | return remove_monitor_info(local, origskb, rtap_len); | |
263 | } | |
264 | ||
265 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
266 | /* only need to expand headroom if necessary */ | |
267 | skb = origskb; | |
268 | origskb = NULL; | |
269 | ||
270 | /* | |
271 | * This shouldn't trigger often because most devices have an | |
272 | * RX header they pull before we get here, and that should | |
273 | * be big enough for our radiotap information. We should | |
274 | * probably export the length to drivers so that we can have | |
275 | * them allocate enough headroom to start with. | |
276 | */ | |
277 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 278 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
279 | dev_kfree_skb(skb); |
280 | return NULL; | |
281 | } | |
282 | } else { | |
283 | /* | |
284 | * Need to make a copy and possibly remove radiotap header | |
285 | * and FCS from the original. | |
286 | */ | |
287 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
288 | ||
289 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
290 | ||
291 | if (!skb) | |
292 | return origskb; | |
293 | } | |
294 | ||
295 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
296 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
297 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
298 | needed_headroom); | |
b2e7771e | 299 | |
ce3edf6d | 300 | skb_reset_mac_header(skb); |
b2e7771e JB |
301 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
302 | skb->pkt_type = PACKET_OTHERHOST; | |
303 | skb->protocol = htons(ETH_P_802_2); | |
304 | ||
305 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
306 | if (!netif_running(sdata->dev)) | |
307 | continue; | |
308 | ||
05c914fe | 309 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
310 | continue; |
311 | ||
3d30d949 MW |
312 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
313 | continue; | |
314 | ||
b2e7771e JB |
315 | if (prev_dev) { |
316 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
317 | if (skb2) { | |
318 | skb2->dev = prev_dev; | |
319 | netif_rx(skb2); | |
320 | } | |
321 | } | |
322 | ||
323 | prev_dev = sdata->dev; | |
324 | sdata->dev->stats.rx_packets++; | |
325 | sdata->dev->stats.rx_bytes += skb->len; | |
326 | } | |
327 | ||
328 | if (prev_dev) { | |
329 | skb->dev = prev_dev; | |
330 | netif_rx(skb); | |
331 | } else | |
332 | dev_kfree_skb(skb); | |
333 | ||
334 | return origskb; | |
335 | } | |
336 | ||
337 | ||
5cf121c3 | 338 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 339 | { |
238f74a2 | 340 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
341 | int tid; |
342 | ||
343 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
344 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
345 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 346 | /* frame has qos control */ |
238f74a2 HH |
347 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
348 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 349 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 350 | else |
5cf121c3 | 351 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 352 | } else { |
1411f9b5 JB |
353 | /* |
354 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
355 | * | |
356 | * Sequence numbers for management frames, QoS data | |
357 | * frames with a broadcast/multicast address in the | |
358 | * Address 1 field, and all non-QoS data frames sent | |
359 | * by QoS STAs are assigned using an additional single | |
360 | * modulo-4096 counter, [...] | |
361 | * | |
362 | * We also use that counter for non-QoS STAs. | |
363 | */ | |
364 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 365 | } |
52865dfd | 366 | |
5cf121c3 | 367 | rx->queue = tid; |
6e0d114d JB |
368 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
369 | * For now, set skb->priority to 0 for other cases. */ | |
370 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 371 | } |
6e0d114d | 372 | |
5cf121c3 | 373 | static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx) |
38f3714d JB |
374 | { |
375 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
a7767f95 | 376 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
377 | int hdrlen; |
378 | ||
a7767f95 | 379 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
380 | return; |
381 | ||
382 | /* | |
383 | * Drivers are required to align the payload data in a way that | |
384 | * guarantees that the contained IP header is aligned to a four- | |
385 | * byte boundary. In the case of regular frames, this simply means | |
386 | * aligning the payload to a four-byte boundary (because either | |
387 | * the IP header is directly contained, or IV/RFC1042 headers that | |
388 | * have a length divisible by four are in front of it. | |
389 | * | |
390 | * With A-MSDU frames, however, the payload data address must | |
391 | * yield two modulo four because there are 14-byte 802.3 headers | |
392 | * within the A-MSDU frames that push the IP header further back | |
393 | * to a multiple of four again. Thankfully, the specs were sane | |
394 | * enough this time around to require padding each A-MSDU subframe | |
395 | * to a length that is a multiple of four. | |
396 | * | |
397 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
398 | * header and the payload is not supported, the driver is required | |
399 | * to move the 802.11 header further back in that case. | |
400 | */ | |
a7767f95 | 401 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 402 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d JB |
403 | hdrlen += ETH_HLEN; |
404 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
405 | #endif | |
6e0d114d JB |
406 | } |
407 | ||
6368e4b1 | 408 | |
571ecf67 JB |
409 | /* rx handlers */ |
410 | ||
49461622 | 411 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 412 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
413 | { |
414 | struct ieee80211_local *local = rx->local; | |
415 | struct sk_buff *skb = rx->skb; | |
416 | ||
c2b13452 JB |
417 | if (unlikely(local->hw_scanning)) |
418 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 419 | |
c2b13452 | 420 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 421 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 422 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 423 | != RX_QUEUED) |
ece8eddd | 424 | dev_kfree_skb(skb); |
9ae54c84 | 425 | return RX_QUEUED; |
571ecf67 JB |
426 | } |
427 | ||
5cf121c3 | 428 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
429 | /* scanning finished during invoking of handlers */ |
430 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 431 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
432 | } |
433 | ||
9ae54c84 | 434 | return RX_CONTINUE; |
571ecf67 JB |
435 | } |
436 | ||
33b64eb2 | 437 | static ieee80211_rx_result |
5cf121c3 | 438 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 439 | { |
a7767f95 HH |
440 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
441 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 442 | |
a7767f95 HH |
443 | if (ieee80211_is_data(hdr->frame_control)) { |
444 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
445 | return RX_DROP_MONITOR; |
446 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
447 | return RX_DROP_MONITOR; | |
448 | } | |
449 | ||
450 | /* If there is not an established peer link and this is not a peer link | |
451 | * establisment frame, beacon or probe, drop the frame. | |
452 | */ | |
453 | ||
b4e08ea1 | 454 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 455 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 456 | |
a7767f95 | 457 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
458 | return RX_DROP_MONITOR; |
459 | ||
a7767f95 | 460 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
461 | mgmt = (struct ieee80211_mgmt *)hdr; |
462 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
463 | return RX_DROP_MONITOR; | |
33b64eb2 | 464 | return RX_CONTINUE; |
33b64eb2 LCC |
465 | } |
466 | ||
a7767f95 HH |
467 | if (ieee80211_is_probe_req(hdr->frame_control) || |
468 | ieee80211_is_probe_resp(hdr->frame_control) || | |
469 | ieee80211_is_beacon(hdr->frame_control)) | |
470 | return RX_CONTINUE; | |
471 | ||
472 | return RX_DROP_MONITOR; | |
473 | ||
474 | } | |
475 | ||
476 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
477 | ||
478 | if (ieee80211_is_data(hdr->frame_control) && | |
479 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 480 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 481 | return RX_DROP_MONITOR; |
902acc78 | 482 | #undef msh_h_get |
d6d1a5a7 | 483 | |
902acc78 JB |
484 | return RX_CONTINUE; |
485 | } | |
33b64eb2 LCC |
486 | |
487 | ||
49461622 | 488 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 489 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 490 | { |
a7767f95 | 491 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
492 | |
493 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
494 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 495 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 496 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 497 | hdr->seq_ctrl)) { |
5cf121c3 | 498 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
499 | rx->local->dot11FrameDuplicateCount++; |
500 | rx->sta->num_duplicates++; | |
501 | } | |
e4c26add | 502 | return RX_DROP_MONITOR; |
571ecf67 | 503 | } else |
5cf121c3 | 504 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
505 | } |
506 | ||
571ecf67 JB |
507 | if (unlikely(rx->skb->len < 16)) { |
508 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 509 | return RX_DROP_MONITOR; |
571ecf67 JB |
510 | } |
511 | ||
571ecf67 JB |
512 | /* Drop disallowed frame classes based on STA auth/assoc state; |
513 | * IEEE 802.11, Chap 5.5. | |
514 | * | |
ccd7b362 JB |
515 | * mac80211 filters only based on association state, i.e. it drops |
516 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
517 | * deauth/disassoc frames when needed. In addition, hostapd is |
518 | * responsible for filtering on both auth and assoc states. | |
519 | */ | |
33b64eb2 | 520 | |
902acc78 | 521 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 522 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 523 | |
a7767f95 HH |
524 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
525 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 526 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 527 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
528 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
529 | !ieee80211_has_tods(hdr->frame_control) && | |
530 | ieee80211_is_data(hdr->frame_control)) || | |
531 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
532 | /* Drop IBSS frames and frames for other hosts |
533 | * silently. */ | |
e4c26add | 534 | return RX_DROP_MONITOR; |
571ecf67 JB |
535 | } |
536 | ||
e4c26add | 537 | return RX_DROP_MONITOR; |
571ecf67 JB |
538 | } |
539 | ||
9ae54c84 | 540 | return RX_CONTINUE; |
570bd537 JB |
541 | } |
542 | ||
543 | ||
49461622 | 544 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 545 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 546 | { |
a7767f95 | 547 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
548 | int keyidx; |
549 | int hdrlen; | |
e4c26add | 550 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 551 | struct ieee80211_key *stakey = NULL; |
570bd537 | 552 | |
3017b80b JB |
553 | /* |
554 | * Key selection 101 | |
555 | * | |
556 | * There are three types of keys: | |
557 | * - GTK (group keys) | |
558 | * - PTK (pairwise keys) | |
559 | * - STK (station-to-station pairwise keys) | |
560 | * | |
561 | * When selecting a key, we have to distinguish between multicast | |
562 | * (including broadcast) and unicast frames, the latter can only | |
563 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
564 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
565 | * frames can also use key indizes like GTKs. Hence, if we don't | |
566 | * have a PTK/STK we check the key index for a WEP key. | |
567 | * | |
8dc06a1c JB |
568 | * Note that in a regular BSS, multicast frames are sent by the |
569 | * AP only, associated stations unicast the frame to the AP first | |
570 | * which then multicasts it on their behalf. | |
571 | * | |
3017b80b JB |
572 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
573 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
574 | * The spec seems to expect that one negotiates the same key with |
575 | * every station but there's no such requirement; VLANs could be | |
576 | * possible. | |
3017b80b JB |
577 | */ |
578 | ||
a7767f95 | 579 | if (!ieee80211_has_protected(hdr->frame_control)) |
9ae54c84 | 580 | return RX_CONTINUE; |
571ecf67 | 581 | |
3017b80b | 582 | /* |
1990af8d | 583 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
584 | * addressed to us nor a multicast frame. |
585 | */ | |
5cf121c3 | 586 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 587 | return RX_CONTINUE; |
3017b80b | 588 | |
d4e46a3d JB |
589 | if (rx->sta) |
590 | stakey = rcu_dereference(rx->sta->key); | |
591 | ||
592 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
593 | rx->key = stakey; | |
571ecf67 | 594 | } else { |
3017b80b JB |
595 | /* |
596 | * The device doesn't give us the IV so we won't be | |
597 | * able to look up the key. That's ok though, we | |
598 | * don't need to decrypt the frame, we just won't | |
599 | * be able to keep statistics accurate. | |
600 | * Except for key threshold notifications, should | |
601 | * we somehow allow the driver to tell us which key | |
602 | * the hardware used if this flag is set? | |
603 | */ | |
5cf121c3 JB |
604 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
605 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 606 | return RX_CONTINUE; |
3017b80b | 607 | |
a7767f95 | 608 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
609 | |
610 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 611 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
612 | |
613 | /* | |
614 | * no need to call ieee80211_wep_get_keyidx, | |
615 | * it verifies a bunch of things we've done already | |
616 | */ | |
617 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
618 | ||
d4e46a3d | 619 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
620 | |
621 | /* | |
622 | * RSNA-protected unicast frames should always be sent with | |
623 | * pairwise or station-to-station keys, but for WEP we allow | |
624 | * using a key index as well. | |
625 | */ | |
8f20fc24 | 626 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
627 | !is_multicast_ether_addr(hdr->addr1)) |
628 | rx->key = NULL; | |
571ecf67 JB |
629 | } |
630 | ||
3017b80b | 631 | if (rx->key) { |
571ecf67 | 632 | rx->key->tx_rx_count++; |
011bfcc4 | 633 | /* TODO: add threshold stuff again */ |
1990af8d | 634 | } else { |
e4c26add | 635 | return RX_DROP_MONITOR; |
70f08765 JB |
636 | } |
637 | ||
1990af8d JB |
638 | /* Check for weak IVs if possible */ |
639 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 640 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
641 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
642 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
643 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
644 | rx->sta->wep_weak_iv_count++; | |
645 | ||
70f08765 JB |
646 | switch (rx->key->conf.alg) { |
647 | case ALG_WEP: | |
e2f036da MN |
648 | result = ieee80211_crypto_wep_decrypt(rx); |
649 | break; | |
70f08765 | 650 | case ALG_TKIP: |
e2f036da MN |
651 | result = ieee80211_crypto_tkip_decrypt(rx); |
652 | break; | |
70f08765 | 653 | case ALG_CCMP: |
e2f036da MN |
654 | result = ieee80211_crypto_ccmp_decrypt(rx); |
655 | break; | |
70f08765 JB |
656 | } |
657 | ||
e2f036da | 658 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 659 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
660 | |
661 | return result; | |
70f08765 JB |
662 | } |
663 | ||
133b8226 | 664 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 665 | { |
133b8226 | 666 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 667 | struct ieee80211_local *local = sdata->local; |
0795af57 | 668 | |
3e122be0 | 669 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 670 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
89fad578 CL |
671 | if (local->ops->sta_notify) |
672 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
673 | STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 674 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
675 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
676 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
677 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
678 | } | |
679 | ||
133b8226 | 680 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 681 | { |
133b8226 JB |
682 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
683 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
684 | struct sk_buff *skb; |
685 | int sent = 0; | |
571ecf67 | 686 | |
3e122be0 | 687 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 688 | |
07346f81 | 689 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
89fad578 CL |
690 | if (local->ops->sta_notify) |
691 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
692 | STA_NOTIFY_AWAKE, &sta->sta); | |
004c872e JB |
693 | |
694 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
695 | sta_info_clear_tim_bit(sta); | |
696 | ||
571ecf67 | 697 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
698 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
699 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 700 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 701 | |
571ecf67 JB |
702 | /* Send all buffered frames to the station */ |
703 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 704 | sent++; |
8b30b1fe | 705 | skb->requeue = 1; |
571ecf67 JB |
706 | dev_queue_xmit(skb); |
707 | } | |
708 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
709 | local->total_ps_buffered--; |
710 | sent++; | |
711 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 712 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 713 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 714 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 715 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 716 | skb->requeue = 1; |
571ecf67 JB |
717 | dev_queue_xmit(skb); |
718 | } | |
719 | ||
720 | return sent; | |
721 | } | |
722 | ||
49461622 | 723 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 724 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
725 | { |
726 | struct sta_info *sta = rx->sta; | |
a7767f95 | 727 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
728 | |
729 | if (!sta) | |
9ae54c84 | 730 | return RX_CONTINUE; |
571ecf67 JB |
731 | |
732 | /* Update last_rx only for IBSS packets which are for the current | |
733 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
734 | * other STAs are using different BSSID. */ | |
05c914fe | 735 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 736 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 737 | NL80211_IFTYPE_ADHOC); |
571ecf67 JB |
738 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
739 | sta->last_rx = jiffies; | |
740 | } else | |
741 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 742 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
743 | /* Update last_rx only for unicast frames in order to prevent |
744 | * the Probe Request frames (the only broadcast frames from a | |
745 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
746 | * Mesh beacons will update last_rx when if they are found to |
747 | * match the current local configuration when processed. | |
571ecf67 JB |
748 | */ |
749 | sta->last_rx = jiffies; | |
750 | } | |
751 | ||
5cf121c3 | 752 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 753 | return RX_CONTINUE; |
571ecf67 JB |
754 | |
755 | sta->rx_fragments++; | |
756 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 757 | sta->last_signal = rx->status->signal; |
566bfe5a | 758 | sta->last_qual = rx->status->qual; |
5cf121c3 | 759 | sta->last_noise = rx->status->noise; |
571ecf67 | 760 | |
72eaa43a JB |
761 | /* |
762 | * Change STA power saving mode only at the end of a frame | |
763 | * exchange sequence. | |
764 | */ | |
3e122be0 | 765 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
766 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
767 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
768 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
769 | /* | |
770 | * Ignore doze->wake transitions that are | |
771 | * indicated by non-data frames, the standard | |
772 | * is unclear here, but for example going to | |
773 | * PS mode and then scanning would cause a | |
774 | * doze->wake transition for the probe request, | |
775 | * and that is clearly undesirable. | |
776 | */ | |
777 | if (ieee80211_is_data(hdr->frame_control) && | |
778 | !ieee80211_has_pm(hdr->frame_control)) | |
779 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
780 | } else { | |
781 | if (ieee80211_has_pm(hdr->frame_control)) | |
782 | ap_sta_ps_start(sta); | |
783 | } | |
571ecf67 JB |
784 | } |
785 | ||
786 | /* Drop data::nullfunc frames silently, since they are used only to | |
787 | * control station power saving mode. */ | |
a7767f95 | 788 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
789 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
790 | /* Update counter and free packet here to avoid counting this | |
791 | * as a dropped packed. */ | |
792 | sta->rx_packets++; | |
793 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 794 | return RX_QUEUED; |
571ecf67 JB |
795 | } |
796 | ||
9ae54c84 | 797 | return RX_CONTINUE; |
571ecf67 JB |
798 | } /* ieee80211_rx_h_sta_process */ |
799 | ||
571ecf67 JB |
800 | static inline struct ieee80211_fragment_entry * |
801 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
802 | unsigned int frag, unsigned int seq, int rx_queue, | |
803 | struct sk_buff **skb) | |
804 | { | |
805 | struct ieee80211_fragment_entry *entry; | |
806 | int idx; | |
807 | ||
808 | idx = sdata->fragment_next; | |
809 | entry = &sdata->fragments[sdata->fragment_next++]; | |
810 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
811 | sdata->fragment_next = 0; | |
812 | ||
813 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 814 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
815 | struct ieee80211_hdr *hdr = |
816 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
817 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
818 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 819 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
820 | sdata->dev->name, idx, |
821 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 822 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 823 | #endif |
571ecf67 JB |
824 | __skb_queue_purge(&entry->skb_list); |
825 | } | |
826 | ||
827 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
828 | *skb = NULL; | |
829 | entry->first_frag_time = jiffies; | |
830 | entry->seq = seq; | |
831 | entry->rx_queue = rx_queue; | |
832 | entry->last_frag = frag; | |
833 | entry->ccmp = 0; | |
834 | entry->extra_len = 0; | |
835 | ||
836 | return entry; | |
837 | } | |
838 | ||
839 | static inline struct ieee80211_fragment_entry * | |
840 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 841 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
842 | int rx_queue, struct ieee80211_hdr *hdr) |
843 | { | |
844 | struct ieee80211_fragment_entry *entry; | |
845 | int i, idx; | |
846 | ||
847 | idx = sdata->fragment_next; | |
848 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
849 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
850 | |
851 | idx--; | |
852 | if (idx < 0) | |
853 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
854 | ||
855 | entry = &sdata->fragments[idx]; | |
856 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
857 | entry->rx_queue != rx_queue || | |
858 | entry->last_frag + 1 != frag) | |
859 | continue; | |
860 | ||
b73d70ad | 861 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 862 | |
b73d70ad HH |
863 | /* |
864 | * Check ftype and addresses are equal, else check next fragment | |
865 | */ | |
866 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
867 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
868 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
869 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
870 | continue; | |
871 | ||
ab46623e | 872 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
873 | __skb_queue_purge(&entry->skb_list); |
874 | continue; | |
875 | } | |
876 | return entry; | |
877 | } | |
878 | ||
879 | return NULL; | |
880 | } | |
881 | ||
49461622 | 882 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 883 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
884 | { |
885 | struct ieee80211_hdr *hdr; | |
886 | u16 sc; | |
358c8d9d | 887 | __le16 fc; |
571ecf67 JB |
888 | unsigned int frag, seq; |
889 | struct ieee80211_fragment_entry *entry; | |
890 | struct sk_buff *skb; | |
891 | ||
b73d70ad | 892 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 893 | fc = hdr->frame_control; |
571ecf67 JB |
894 | sc = le16_to_cpu(hdr->seq_ctrl); |
895 | frag = sc & IEEE80211_SCTL_FRAG; | |
896 | ||
358c8d9d | 897 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
898 | (rx->skb)->len < 24 || |
899 | is_multicast_ether_addr(hdr->addr1))) { | |
900 | /* not fragmented */ | |
901 | goto out; | |
902 | } | |
903 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
904 | ||
905 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
906 | ||
907 | if (frag == 0) { | |
908 | /* This is the first fragment of a new frame. */ | |
909 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 910 | rx->queue, &(rx->skb)); |
8f20fc24 | 911 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 912 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
913 | /* Store CCMP PN so that we can verify that the next |
914 | * fragment has a sequential PN value. */ | |
915 | entry->ccmp = 1; | |
916 | memcpy(entry->last_pn, | |
5cf121c3 | 917 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
918 | CCMP_PN_LEN); |
919 | } | |
9ae54c84 | 920 | return RX_QUEUED; |
571ecf67 JB |
921 | } |
922 | ||
923 | /* This is a fragment for a frame that should already be pending in | |
924 | * fragment cache. Add this fragment to the end of the pending entry. | |
925 | */ | |
b73d70ad | 926 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
927 | if (!entry) { |
928 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 929 | return RX_DROP_MONITOR; |
571ecf67 JB |
930 | } |
931 | ||
932 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
933 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
934 | if (entry->ccmp) { | |
935 | int i; | |
936 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 937 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 938 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
939 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
940 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
941 | pn[i]++; | |
942 | if (pn[i]) | |
943 | break; | |
944 | } | |
5cf121c3 | 945 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 946 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 947 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
948 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
949 | } | |
950 | ||
358c8d9d | 951 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
952 | __skb_queue_tail(&entry->skb_list, rx->skb); |
953 | entry->last_frag = frag; | |
954 | entry->extra_len += rx->skb->len; | |
358c8d9d | 955 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 956 | rx->skb = NULL; |
9ae54c84 | 957 | return RX_QUEUED; |
571ecf67 JB |
958 | } |
959 | ||
960 | rx->skb = __skb_dequeue(&entry->skb_list); | |
961 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
962 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
963 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
964 | GFP_ATOMIC))) { | |
965 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
966 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 967 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
968 | } |
969 | } | |
970 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
971 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
972 | dev_kfree_skb(skb); | |
973 | } | |
974 | ||
975 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 976 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
977 | |
978 | out: | |
979 | if (rx->sta) | |
980 | rx->sta->rx_packets++; | |
981 | if (is_multicast_ether_addr(hdr->addr1)) | |
982 | rx->local->dot11MulticastReceivedFrameCount++; | |
983 | else | |
984 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 985 | return RX_CONTINUE; |
571ecf67 JB |
986 | } |
987 | ||
49461622 | 988 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 989 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 990 | { |
98f0b0a3 | 991 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
992 | struct sk_buff *skb; |
993 | int no_pending_pkts; | |
358c8d9d | 994 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 995 | |
358c8d9d | 996 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 997 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 998 | return RX_CONTINUE; |
571ecf67 | 999 | |
05c914fe JB |
1000 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1001 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1002 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1003 | |
571ecf67 JB |
1004 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1005 | if (!skb) { | |
1006 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1007 | if (skb) | |
1008 | rx->local->total_ps_buffered--; | |
1009 | } | |
1010 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1011 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1012 | ||
1013 | if (skb) { | |
1014 | struct ieee80211_hdr *hdr = | |
1015 | (struct ieee80211_hdr *) skb->data; | |
1016 | ||
4a9a66e9 JB |
1017 | /* |
1018 | * Tell TX path to send one frame even though the STA may | |
1019 | * still remain is PS mode after this frame exchange. | |
1020 | */ | |
07346f81 | 1021 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1022 | |
1023 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1024 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1025 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1026 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1027 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1028 | ||
1029 | /* Use MoreData flag to indicate whether there are more | |
1030 | * buffered frames for this STA */ | |
836341a7 | 1031 | if (no_pending_pkts) |
571ecf67 | 1032 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1033 | else |
571ecf67 JB |
1034 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1035 | ||
1036 | dev_queue_xmit(skb); | |
1037 | ||
004c872e JB |
1038 | if (no_pending_pkts) |
1039 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1040 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1041 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1042 | /* |
1043 | * FIXME: This can be the result of a race condition between | |
1044 | * us expiring a frame and the station polling for it. | |
1045 | * Should we send it a null-func frame indicating we | |
1046 | * have nothing buffered for it? | |
1047 | */ | |
0c68ae26 | 1048 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1049 | "though there are no buffered frames for it\n", |
0c68ae26 | 1050 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1051 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1052 | } |
1053 | ||
9ae54c84 | 1054 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1055 | * count as an dropped frame. */ |
1056 | dev_kfree_skb(rx->skb); | |
1057 | ||
9ae54c84 | 1058 | return RX_QUEUED; |
571ecf67 JB |
1059 | } |
1060 | ||
49461622 | 1061 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1062 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1063 | { |
6e0d114d | 1064 | u8 *data = rx->skb->data; |
238f74a2 | 1065 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1066 | |
238f74a2 | 1067 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1068 | return RX_CONTINUE; |
6e0d114d JB |
1069 | |
1070 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1071 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1072 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1073 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1074 | /* change frame type to non QOS */ |
238f74a2 | 1075 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1076 | |
9ae54c84 | 1077 | return RX_CONTINUE; |
6e0d114d JB |
1078 | } |
1079 | ||
76ee65bf | 1080 | static int |
5cf121c3 | 1081 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1082 | { |
07346f81 | 1083 | if (unlikely(!rx->sta || |
f4ea83dd | 1084 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1085 | return -EACCES; |
571ecf67 | 1086 | |
76ee65bf | 1087 | return 0; |
571ecf67 JB |
1088 | } |
1089 | ||
76ee65bf | 1090 | static int |
358c8d9d | 1091 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1092 | { |
3017b80b | 1093 | /* |
7848ba7d JB |
1094 | * Pass through unencrypted frames if the hardware has |
1095 | * decrypted them already. | |
3017b80b | 1096 | */ |
5cf121c3 | 1097 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1098 | return 0; |
571ecf67 JB |
1099 | |
1100 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1101 | if (unlikely(!ieee80211_has_protected(fc) && |
1102 | !ieee80211_is_nullfunc(fc) && | |
b3fc9c6c | 1103 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1104 | return -EACCES; |
b3fc9c6c | 1105 | |
76ee65bf | 1106 | return 0; |
571ecf67 JB |
1107 | } |
1108 | ||
76ee65bf | 1109 | static int |
5cf121c3 | 1110 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1111 | { |
1112 | struct net_device *dev = rx->dev; | |
571ecf67 | 1113 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1114 | u16 hdrlen, ethertype; |
571ecf67 JB |
1115 | u8 *payload; |
1116 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1117 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1118 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1119 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1120 | ||
b73d70ad | 1121 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1122 | return -1; |
571ecf67 | 1123 | |
b73d70ad | 1124 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1125 | |
1126 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1127 | * header | |
1128 | * IEEE 802.11 address fields: | |
1129 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1130 | * 0 0 DA SA BSSID n/a | |
1131 | * 0 1 DA BSSID SA n/a | |
1132 | * 1 0 BSSID SA DA n/a | |
1133 | * 1 1 RA TA DA SA | |
1134 | */ | |
b73d70ad HH |
1135 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1136 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1137 | |
b73d70ad HH |
1138 | switch (hdr->frame_control & |
1139 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1140 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS): | |
05c914fe JB |
1141 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1142 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1143 | return -1; |
571ecf67 | 1144 | break; |
b73d70ad | 1145 | case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1146 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1147 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1148 | return -1; |
79617dee Y |
1149 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1150 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1151 | (skb->data + hdrlen); | |
1152 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1153 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1154 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1155 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1156 | } | |
1157 | } | |
571ecf67 | 1158 | break; |
b73d70ad | 1159 | case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1160 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1161 | (is_multicast_ether_addr(dst) && |
1162 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1163 | return -1; |
571ecf67 | 1164 | break; |
b73d70ad | 1165 | case __constant_cpu_to_le16(0): |
05c914fe | 1166 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1167 | return -1; |
571ecf67 JB |
1168 | break; |
1169 | } | |
1170 | ||
f4ea83dd | 1171 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1172 | return -1; |
571ecf67 | 1173 | |
76ee65bf | 1174 | payload = skb->data + hdrlen; |
571ecf67 JB |
1175 | ethertype = (payload[6] << 8) | payload[7]; |
1176 | ||
1177 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1178 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1179 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1180 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1181 | * replace EtherType */ | |
1182 | skb_pull(skb, hdrlen + 6); | |
1183 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1184 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1185 | } else { | |
1186 | struct ethhdr *ehdr; | |
1187 | __be16 len; | |
ce3edf6d | 1188 | |
571ecf67 JB |
1189 | skb_pull(skb, hdrlen); |
1190 | len = htons(skb->len); | |
1191 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1192 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1193 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1194 | ehdr->h_proto = len; | |
1195 | } | |
76ee65bf RR |
1196 | return 0; |
1197 | } | |
571ecf67 | 1198 | |
ce3edf6d JB |
1199 | /* |
1200 | * requires that rx->skb is a frame with ethernet header | |
1201 | */ | |
358c8d9d | 1202 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1203 | { |
c97c23e3 | 1204 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1205 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1206 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1207 | ||
1208 | /* | |
1209 | * Allow EAPOL frames to us/the PAE group address regardless | |
1210 | * of whether the frame was encrypted or not. | |
1211 | */ | |
1212 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1213 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1214 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1215 | return true; | |
1216 | ||
1217 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1218 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1219 | return false; |
1220 | ||
1221 | return true; | |
1222 | } | |
1223 | ||
1224 | /* | |
1225 | * requires that rx->skb is a frame with ethernet header | |
1226 | */ | |
76ee65bf | 1227 | static void |
5cf121c3 | 1228 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1229 | { |
1230 | struct net_device *dev = rx->dev; | |
1231 | struct ieee80211_local *local = rx->local; | |
1232 | struct sk_buff *skb, *xmit_skb; | |
1233 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1234 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1235 | struct sta_info *dsta; | |
571ecf67 | 1236 | |
76ee65bf RR |
1237 | skb = rx->skb; |
1238 | xmit_skb = NULL; | |
571ecf67 | 1239 | |
05c914fe JB |
1240 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1241 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1242 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1243 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1244 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1245 | /* | |
1246 | * send multicast frames both to higher layers in | |
1247 | * local net stack and back to the wireless medium | |
1248 | */ | |
76ee65bf RR |
1249 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1250 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1251 | printk(KERN_DEBUG "%s: failed to clone " |
1252 | "multicast frame\n", dev->name); | |
1253 | } else { | |
571ecf67 | 1254 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1255 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1256 | /* |
1257 | * The destination station is associated to | |
1258 | * this AP (in this VLAN), so send the frame | |
1259 | * directly to it and do not pass it to local | |
1260 | * net stack. | |
571ecf67 | 1261 | */ |
76ee65bf | 1262 | xmit_skb = skb; |
571ecf67 JB |
1263 | skb = NULL; |
1264 | } | |
571ecf67 JB |
1265 | } |
1266 | } | |
1267 | ||
1268 | if (skb) { | |
1269 | /* deliver to local stack */ | |
1270 | skb->protocol = eth_type_trans(skb, dev); | |
1271 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1272 | netif_rx(skb); | |
1273 | } | |
1274 | ||
76ee65bf | 1275 | if (xmit_skb) { |
571ecf67 | 1276 | /* send to wireless media */ |
f831e909 | 1277 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1278 | skb_reset_network_header(xmit_skb); |
1279 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1280 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1281 | } |
76ee65bf RR |
1282 | } |
1283 | ||
49461622 | 1284 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1285 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1286 | { |
1287 | struct net_device *dev = rx->dev; | |
1288 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1289 | u16 ethertype; |
fd4c7f2f RR |
1290 | u8 *payload; |
1291 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1292 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1293 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1294 | const struct ethhdr *eth; |
1295 | int remaining, err; | |
1296 | u8 dst[ETH_ALEN]; | |
1297 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1298 | |
358c8d9d | 1299 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1300 | return RX_CONTINUE; |
fd4c7f2f | 1301 | |
358c8d9d | 1302 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1303 | return RX_DROP_MONITOR; |
fd4c7f2f | 1304 | |
5cf121c3 | 1305 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1306 | return RX_CONTINUE; |
fd4c7f2f RR |
1307 | |
1308 | err = ieee80211_data_to_8023(rx); | |
1309 | if (unlikely(err)) | |
e4c26add | 1310 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1311 | |
1312 | skb->dev = dev; | |
1313 | ||
1314 | dev->stats.rx_packets++; | |
1315 | dev->stats.rx_bytes += skb->len; | |
1316 | ||
1317 | /* skip the wrapping header */ | |
1318 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1319 | if (!eth) | |
e4c26add | 1320 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1321 | |
1322 | while (skb != frame) { | |
1323 | u8 padding; | |
1324 | __be16 len = eth->h_proto; | |
1325 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1326 | ||
1327 | remaining = skb->len; | |
1328 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1329 | memcpy(src, eth->h_source, ETH_ALEN); | |
1330 | ||
1331 | padding = ((4 - subframe_len) & 0x3); | |
1332 | /* the last MSDU has no padding */ | |
f4ea83dd | 1333 | if (subframe_len > remaining) |
e4c26add | 1334 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1335 | |
1336 | skb_pull(skb, sizeof(struct ethhdr)); | |
1337 | /* if last subframe reuse skb */ | |
1338 | if (remaining <= subframe_len + padding) | |
1339 | frame = skb; | |
1340 | else { | |
1341 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1342 | subframe_len); | |
1343 | ||
1344 | if (frame == NULL) | |
e4c26add | 1345 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1346 | |
1347 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1348 | sizeof(struct ethhdr)); | |
1349 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1350 | ntohs(len)); | |
1351 | ||
1352 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1353 | padding); | |
1354 | if (!eth) { | |
fd4c7f2f | 1355 | dev_kfree_skb(frame); |
e4c26add | 1356 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1357 | } |
1358 | } | |
1359 | ||
ce3edf6d | 1360 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1361 | frame->dev = dev; |
1362 | frame->priority = skb->priority; | |
1363 | rx->skb = frame; | |
1364 | ||
fd4c7f2f RR |
1365 | payload = frame->data; |
1366 | ethertype = (payload[6] << 8) | payload[7]; | |
1367 | ||
1368 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1369 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1370 | compare_ether_addr(payload, | |
1371 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1372 | /* remove RFC1042 or Bridge-Tunnel |
1373 | * encapsulation and replace EtherType */ | |
1374 | skb_pull(frame, 6); | |
1375 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1376 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1377 | } else { | |
ce3edf6d JB |
1378 | memcpy(skb_push(frame, sizeof(__be16)), |
1379 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1380 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1381 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1382 | } | |
1383 | ||
358c8d9d | 1384 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1385 | if (skb == frame) /* last frame */ |
e4c26add | 1386 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1387 | dev_kfree_skb(frame); |
1388 | continue; | |
1389 | } | |
fd4c7f2f RR |
1390 | |
1391 | ieee80211_deliver_skb(rx); | |
1392 | } | |
1393 | ||
9ae54c84 | 1394 | return RX_QUEUED; |
fd4c7f2f RR |
1395 | } |
1396 | ||
bf94e17b | 1397 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1398 | static ieee80211_rx_result |
e32f85f7 LCC |
1399 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1400 | { | |
1401 | struct ieee80211_hdr *hdr; | |
1402 | struct ieee80211s_hdr *mesh_hdr; | |
1403 | unsigned int hdrlen; | |
1404 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1405 | ||
1406 | hdr = (struct ieee80211_hdr *) skb->data; | |
1407 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1408 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1409 | ||
1410 | if (!ieee80211_is_data(hdr->frame_control)) | |
1411 | return RX_CONTINUE; | |
1412 | ||
1413 | if (!mesh_hdr->ttl) | |
1414 | /* illegal frame */ | |
1415 | return RX_DROP_MONITOR; | |
1416 | ||
79617dee Y |
1417 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1418 | struct ieee80211_sub_if_data *sdata; | |
1419 | struct mesh_path *mppath; | |
1420 | ||
1421 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1422 | rcu_read_lock(); | |
1423 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1424 | if (!mppath) { | |
1425 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1426 | } else { | |
1427 | spin_lock_bh(&mppath->state_lock); | |
1428 | mppath->exp_time = jiffies; | |
1429 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1430 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1431 | spin_unlock_bh(&mppath->state_lock); | |
1432 | } | |
1433 | rcu_read_unlock(); | |
1434 | } | |
1435 | ||
e32f85f7 LCC |
1436 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1437 | return RX_CONTINUE; | |
1438 | ||
1439 | mesh_hdr->ttl--; | |
1440 | ||
1441 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1442 | if (!mesh_hdr->ttl) | |
472dbc45 | 1443 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1444 | dropped_frames_ttl); |
1445 | else { | |
1446 | struct ieee80211_hdr *fwd_hdr; | |
1447 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1448 | ||
1449 | if (!fwd_skb && net_ratelimit()) | |
1450 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1451 | rx->dev->name); | |
1452 | ||
1453 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1454 | /* | |
1455 | * Save TA to addr1 to send TA a path error if a | |
1456 | * suitable next hop is not found | |
1457 | */ | |
1458 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1459 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1460 | fwd_skb->dev = rx->local->mdev; | |
1461 | fwd_skb->iif = rx->dev->ifindex; | |
1462 | dev_queue_xmit(fwd_skb); | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | if (is_multicast_ether_addr(hdr->addr3) || | |
1467 | rx->dev->flags & IFF_PROMISC) | |
1468 | return RX_CONTINUE; | |
1469 | else | |
1470 | return RX_DROP_MONITOR; | |
1471 | } | |
bf94e17b | 1472 | #endif |
e32f85f7 | 1473 | |
49461622 | 1474 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1475 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1476 | { |
1477 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1478 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1479 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1480 | int err; |
76ee65bf | 1481 | |
358c8d9d | 1482 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1483 | return RX_CONTINUE; |
76ee65bf | 1484 | |
358c8d9d | 1485 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1486 | return RX_DROP_MONITOR; |
76ee65bf | 1487 | |
76ee65bf RR |
1488 | err = ieee80211_data_to_8023(rx); |
1489 | if (unlikely(err)) | |
e4c26add | 1490 | return RX_DROP_UNUSABLE; |
76ee65bf | 1491 | |
358c8d9d | 1492 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1493 | return RX_DROP_MONITOR; |
ce3edf6d | 1494 | |
76ee65bf RR |
1495 | rx->skb->dev = dev; |
1496 | ||
1497 | dev->stats.rx_packets++; | |
1498 | dev->stats.rx_bytes += rx->skb->len; | |
1499 | ||
1500 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1501 | |
9ae54c84 | 1502 | return RX_QUEUED; |
571ecf67 JB |
1503 | } |
1504 | ||
49461622 | 1505 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1506 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1507 | { |
1508 | struct ieee80211_local *local = rx->local; | |
1509 | struct ieee80211_hw *hw = &local->hw; | |
1510 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1511 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1512 | struct tid_ampdu_rx *tid_agg_rx; |
1513 | u16 start_seq_num; | |
1514 | u16 tid; | |
1515 | ||
a7767f95 | 1516 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1517 | return RX_CONTINUE; |
71364716 | 1518 | |
a7767f95 | 1519 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1520 | if (!rx->sta) |
9ae54c84 | 1521 | return RX_CONTINUE; |
71364716 | 1522 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1523 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1524 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1525 | return RX_CONTINUE; |
cee24a3e | 1526 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1527 | |
1528 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1529 | ||
1530 | /* reset session timer */ | |
1531 | if (tid_agg_rx->timeout) { | |
1532 | unsigned long expires = | |
1533 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1534 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1535 | } | |
1536 | ||
1537 | /* manage reordering buffer according to requested */ | |
1538 | /* sequence number */ | |
1539 | rcu_read_lock(); | |
1540 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1541 | start_seq_num, 1); | |
1542 | rcu_read_unlock(); | |
e4c26add | 1543 | return RX_DROP_UNUSABLE; |
71364716 RR |
1544 | } |
1545 | ||
9ae54c84 | 1546 | return RX_CONTINUE; |
71364716 RR |
1547 | } |
1548 | ||
de1ede7a JB |
1549 | static ieee80211_rx_result debug_noinline |
1550 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1551 | { | |
1552 | struct ieee80211_local *local = rx->local; | |
1553 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1554 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
1555 | int len = rx->skb->len; | |
1556 | ||
1557 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1558 | return RX_CONTINUE; | |
1559 | ||
1560 | if (!rx->sta) | |
1561 | return RX_DROP_MONITOR; | |
1562 | ||
1563 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1564 | return RX_DROP_MONITOR; | |
1565 | ||
1566 | /* all categories we currently handle have action_code */ | |
1567 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1568 | return RX_DROP_MONITOR; | |
1569 | ||
de1ede7a JB |
1570 | switch (mgmt->u.action.category) { |
1571 | case WLAN_CATEGORY_BACK: | |
1572 | switch (mgmt->u.action.u.addba_req.action_code) { | |
1573 | case WLAN_ACTION_ADDBA_REQ: | |
1574 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1575 | sizeof(mgmt->u.action.u.addba_req))) | |
1576 | return RX_DROP_MONITOR; | |
1577 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1578 | break; | |
1579 | case WLAN_ACTION_ADDBA_RESP: | |
1580 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1581 | sizeof(mgmt->u.action.u.addba_resp))) | |
1582 | return RX_DROP_MONITOR; | |
1583 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1584 | break; | |
1585 | case WLAN_ACTION_DELBA: | |
1586 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1587 | sizeof(mgmt->u.action.u.delba))) | |
1588 | return RX_DROP_MONITOR; | |
1589 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1590 | break; | |
1591 | } | |
39192c0b JB |
1592 | break; |
1593 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1594 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1595 | return RX_DROP_MONITOR; | |
1596 | switch (mgmt->u.action.u.measurement.action_code) { | |
1597 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1598 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1599 | sizeof(mgmt->u.action.u.measurement))) | |
1600 | return RX_DROP_MONITOR; | |
1601 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1602 | break; | |
1603 | } | |
1604 | break; | |
1605 | default: | |
1606 | return RX_CONTINUE; | |
de1ede7a JB |
1607 | } |
1608 | ||
39192c0b JB |
1609 | rx->sta->rx_packets++; |
1610 | dev_kfree_skb(rx->skb); | |
1611 | return RX_QUEUED; | |
de1ede7a JB |
1612 | } |
1613 | ||
49461622 | 1614 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1615 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1616 | { |
759ef3eb | 1617 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 | 1618 | |
5cf121c3 | 1619 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1620 | return RX_DROP_MONITOR; |
571ecf67 | 1621 | |
472dbc45 JB |
1622 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1623 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1624 | ||
05c914fe JB |
1625 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
1626 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
759ef3eb JB |
1627 | return RX_DROP_MONITOR; |
1628 | ||
1629 | if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME) | |
e4c26add | 1630 | return RX_DROP_MONITOR; |
f9d540ee | 1631 | |
759ef3eb | 1632 | ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
9ae54c84 | 1633 | return RX_QUEUED; |
571ecf67 JB |
1634 | } |
1635 | ||
571ecf67 JB |
1636 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1637 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1638 | struct ieee80211_rx_data *rx) |
571ecf67 | 1639 | { |
a7767f95 HH |
1640 | int keyidx; |
1641 | unsigned int hdrlen; | |
571ecf67 | 1642 | |
a7767f95 | 1643 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1644 | if (rx->skb->len >= hdrlen + 4) |
1645 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1646 | else | |
1647 | keyidx = -1; | |
1648 | ||
8944b79f | 1649 | if (!rx->sta) { |
aa0daf0e JB |
1650 | /* |
1651 | * Some hardware seem to generate incorrect Michael MIC | |
1652 | * reports; ignore them to avoid triggering countermeasures. | |
1653 | */ | |
571ecf67 JB |
1654 | goto ignore; |
1655 | } | |
1656 | ||
a7767f95 | 1657 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1658 | goto ignore; |
571ecf67 | 1659 | |
05c914fe | 1660 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1661 | /* |
1662 | * APs with pairwise keys should never receive Michael MIC | |
1663 | * errors for non-zero keyidx because these are reserved for | |
1664 | * group keys and only the AP is sending real multicast | |
1665 | * frames in the BSS. | |
1666 | */ | |
eb063c17 | 1667 | goto ignore; |
571ecf67 JB |
1668 | } |
1669 | ||
a7767f95 HH |
1670 | if (!ieee80211_is_data(hdr->frame_control) && |
1671 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1672 | goto ignore; |
571ecf67 | 1673 | |
f698d856 | 1674 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1675 | ignore: |
1676 | dev_kfree_skb(rx->skb); | |
1677 | rx->skb = NULL; | |
1678 | } | |
1679 | ||
5cf121c3 JB |
1680 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1681 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1682 | { |
1683 | struct ieee80211_sub_if_data *sdata; | |
1684 | struct ieee80211_local *local = rx->local; | |
1685 | struct ieee80211_rtap_hdr { | |
1686 | struct ieee80211_radiotap_header hdr; | |
1687 | u8 flags; | |
1688 | u8 rate; | |
1689 | __le16 chan_freq; | |
1690 | __le16 chan_flags; | |
1691 | } __attribute__ ((packed)) *rthdr; | |
1692 | struct sk_buff *skb = rx->skb, *skb2; | |
1693 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1694 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1695 | |
5cf121c3 | 1696 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1697 | goto out_free_skb; |
1698 | ||
1699 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1700 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1701 | goto out_free_skb; | |
1702 | ||
1703 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1704 | memset(rthdr, 0, sizeof(*rthdr)); | |
1705 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1706 | rthdr->hdr.it_present = | |
1707 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1708 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1709 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1710 | ||
5cf121c3 | 1711 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1712 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1713 | ||
1714 | if (status->band == IEEE80211_BAND_5GHZ) | |
1715 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1716 | IEEE80211_CHAN_5GHZ); | |
1717 | else | |
1718 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1719 | IEEE80211_CHAN_2GHZ); | |
1720 | ||
1721 | skb_set_mac_header(skb, 0); | |
1722 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1723 | skb->pkt_type = PACKET_OTHERHOST; | |
1724 | skb->protocol = htons(ETH_P_802_2); | |
1725 | ||
1726 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1727 | if (!netif_running(sdata->dev)) | |
1728 | continue; | |
1729 | ||
05c914fe | 1730 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1731 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1732 | continue; | |
1733 | ||
1734 | if (prev_dev) { | |
1735 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1736 | if (skb2) { | |
1737 | skb2->dev = prev_dev; | |
1738 | netif_rx(skb2); | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | prev_dev = sdata->dev; | |
1743 | sdata->dev->stats.rx_packets++; | |
1744 | sdata->dev->stats.rx_bytes += skb->len; | |
1745 | } | |
1746 | ||
1747 | if (prev_dev) { | |
1748 | skb->dev = prev_dev; | |
1749 | netif_rx(skb); | |
1750 | skb = NULL; | |
1751 | } else | |
1752 | goto out_free_skb; | |
1753 | ||
5cf121c3 | 1754 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1755 | return; |
1756 | ||
1757 | out_free_skb: | |
1758 | dev_kfree_skb(skb); | |
1759 | } | |
1760 | ||
571ecf67 | 1761 | |
8944b79f | 1762 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1763 | struct ieee80211_rx_data *rx, |
8944b79f | 1764 | struct sk_buff *skb) |
58905290 | 1765 | { |
58905290 JB |
1766 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1767 | ||
8944b79f JB |
1768 | rx->skb = skb; |
1769 | rx->sdata = sdata; | |
1770 | rx->dev = sdata->dev; | |
1771 | ||
e32f85f7 LCC |
1772 | #define CALL_RXH(rxh) \ |
1773 | do { \ | |
1774 | res = rxh(rx); \ | |
1775 | if (res != RX_CONTINUE) \ | |
1776 | goto rxh_done; \ | |
1777 | } while (0); | |
49461622 JB |
1778 | |
1779 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1780 | CALL_RXH(ieee80211_rx_h_check) | |
1781 | CALL_RXH(ieee80211_rx_h_decrypt) | |
1782 | CALL_RXH(ieee80211_rx_h_sta_process) | |
1783 | CALL_RXH(ieee80211_rx_h_defragment) | |
1784 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1785 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1786 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1787 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1788 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1789 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1790 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1791 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1792 | #endif |
49461622 JB |
1793 | CALL_RXH(ieee80211_rx_h_data) |
1794 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1795 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1796 | CALL_RXH(ieee80211_rx_h_mgmt) |
1797 | ||
1798 | #undef CALL_RXH | |
1799 | ||
1800 | rxh_done: | |
58905290 JB |
1801 | switch (res) { |
1802 | case RX_DROP_MONITOR: | |
49461622 JB |
1803 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1804 | if (rx->sta) | |
1805 | rx->sta->rx_dropped++; | |
1806 | /* fall through */ | |
1807 | case RX_CONTINUE: | |
3d30d949 MW |
1808 | ieee80211_rx_cooked_monitor(rx); |
1809 | break; | |
58905290 | 1810 | case RX_DROP_UNUSABLE: |
49461622 JB |
1811 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1812 | if (rx->sta) | |
1813 | rx->sta->rx_dropped++; | |
58905290 JB |
1814 | dev_kfree_skb(rx->skb); |
1815 | break; | |
49461622 JB |
1816 | case RX_QUEUED: |
1817 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
1818 | break; | |
58905290 JB |
1819 | } |
1820 | } | |
1821 | ||
571ecf67 JB |
1822 | /* main receive path */ |
1823 | ||
23a24def | 1824 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1825 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1826 | struct ieee80211_hdr *hdr) |
1827 | { | |
1828 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1829 | ||
51fb61e7 | 1830 | switch (sdata->vif.type) { |
05c914fe | 1831 | case NL80211_IFTYPE_STATION: |
23a24def JB |
1832 | if (!bssid) |
1833 | return 0; | |
1834 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1835 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1836 | return 0; |
5cf121c3 | 1837 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1838 | } else if (!multicast && |
1839 | compare_ether_addr(sdata->dev->dev_addr, | |
1840 | hdr->addr1) != 0) { | |
4150c572 | 1841 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1842 | return 0; |
5cf121c3 | 1843 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1844 | } |
1845 | break; | |
05c914fe | 1846 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
1847 | if (!bssid) |
1848 | return 0; | |
a7767f95 | 1849 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 1850 | return 1; |
87291c02 | 1851 | } |
9d9bf77d | 1852 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 1853 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1854 | return 0; |
5cf121c3 | 1855 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1856 | } else if (!multicast && |
1857 | compare_ether_addr(sdata->dev->dev_addr, | |
1858 | hdr->addr1) != 0) { | |
4150c572 | 1859 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1860 | return 0; |
5cf121c3 | 1861 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
1862 | } else if (!rx->sta) { |
1863 | int rate_idx; | |
1864 | if (rx->status->flag & RX_FLAG_HT) | |
1865 | rate_idx = 0; /* TODO: HT rates */ | |
1866 | else | |
1867 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 1868 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
1869 | BIT(rate_idx)); |
1870 | } | |
23a24def | 1871 | break; |
05c914fe | 1872 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
1873 | if (!multicast && |
1874 | compare_ether_addr(sdata->dev->dev_addr, | |
1875 | hdr->addr1) != 0) { | |
1876 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1877 | return 0; | |
1878 | ||
5cf121c3 | 1879 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1880 | } |
1881 | break; | |
05c914fe JB |
1882 | case NL80211_IFTYPE_AP_VLAN: |
1883 | case NL80211_IFTYPE_AP: | |
23a24def JB |
1884 | if (!bssid) { |
1885 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1886 | hdr->addr1)) | |
1887 | return 0; | |
1888 | } else if (!ieee80211_bssid_match(bssid, | |
1889 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1890 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1891 | return 0; |
5cf121c3 | 1892 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1893 | } |
23a24def | 1894 | break; |
05c914fe | 1895 | case NL80211_IFTYPE_WDS: |
a7767f95 | 1896 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
1897 | return 0; |
1898 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1899 | return 0; | |
1900 | break; | |
05c914fe | 1901 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
1902 | /* take everything */ |
1903 | break; | |
05c914fe JB |
1904 | case NL80211_IFTYPE_UNSPECIFIED: |
1905 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
1906 | /* should never get here */ |
1907 | WARN_ON(1); | |
1908 | break; | |
23a24def JB |
1909 | } |
1910 | ||
1911 | return 1; | |
1912 | } | |
1913 | ||
571ecf67 | 1914 | /* |
6368e4b1 RR |
1915 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1916 | * be called with rcu_read_lock protection. | |
571ecf67 | 1917 | */ |
71ebb4aa RR |
1918 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1919 | struct sk_buff *skb, | |
1920 | struct ieee80211_rx_status *status, | |
8318d78a | 1921 | struct ieee80211_rate *rate) |
571ecf67 JB |
1922 | { |
1923 | struct ieee80211_local *local = hw_to_local(hw); | |
1924 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1925 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1926 | struct ieee80211_rx_data rx; |
6368e4b1 | 1927 | int prepares; |
8e6f0032 JB |
1928 | struct ieee80211_sub_if_data *prev = NULL; |
1929 | struct sk_buff *skb_new; | |
1930 | u8 *bssid; | |
571ecf67 | 1931 | |
358c8d9d | 1932 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
1933 | memset(&rx, 0, sizeof(rx)); |
1934 | rx.skb = skb; | |
1935 | rx.local = local; | |
1936 | ||
5cf121c3 | 1937 | rx.status = status; |
5cf121c3 | 1938 | rx.rate = rate; |
72abd81b | 1939 | |
358c8d9d | 1940 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 1941 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1942 | |
8944b79f JB |
1943 | rx.sta = sta_info_get(local, hdr->addr2); |
1944 | if (rx.sta) { | |
d0709a65 JB |
1945 | rx.sdata = rx.sta->sdata; |
1946 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 1947 | } |
571ecf67 | 1948 | |
571ecf67 | 1949 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1950 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 1951 | return; |
571ecf67 JB |
1952 | } |
1953 | ||
c2b13452 | 1954 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 1955 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 1956 | |
38f3714d JB |
1957 | ieee80211_parse_qos(&rx); |
1958 | ieee80211_verify_ip_alignment(&rx); | |
1959 | ||
571ecf67 JB |
1960 | skb = rx.skb; |
1961 | ||
79010420 | 1962 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1963 | if (!netif_running(sdata->dev)) |
1964 | continue; | |
1965 | ||
05c914fe | 1966 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
1967 | continue; |
1968 | ||
51fb61e7 | 1969 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 1970 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 1971 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1972 | |
6368e4b1 | 1973 | if (!prepares) |
23a24def | 1974 | continue; |
8e6f0032 | 1975 | |
340e11f3 JB |
1976 | /* |
1977 | * frame is destined for this interface, but if it's not | |
1978 | * also for the previous one we handle that after the | |
1979 | * loop to avoid copying the SKB once too much | |
1980 | */ | |
1981 | ||
1982 | if (!prev) { | |
1983 | prev = sdata; | |
1984 | continue; | |
8e6f0032 | 1985 | } |
340e11f3 JB |
1986 | |
1987 | /* | |
1988 | * frame was destined for the previous interface | |
1989 | * so invoke RX handlers for it | |
1990 | */ | |
1991 | ||
1992 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1993 | if (!skb_new) { | |
1994 | if (net_ratelimit()) | |
1995 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 1996 | "multicast frame for %s\n", |
dd1cd4c6 JB |
1997 | wiphy_name(local->hw.wiphy), |
1998 | prev->dev->name); | |
340e11f3 JB |
1999 | continue; |
2000 | } | |
8944b79f | 2001 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2002 | prev = sdata; |
571ecf67 | 2003 | } |
a4b7d7bd | 2004 | if (prev) |
8944b79f | 2005 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2006 | else |
8e6f0032 | 2007 | dev_kfree_skb(skb); |
571ecf67 | 2008 | } |
6368e4b1 | 2009 | |
b580781e RR |
2010 | #define SEQ_MODULO 0x1000 |
2011 | #define SEQ_MASK 0xfff | |
2012 | ||
2013 | static inline int seq_less(u16 sq1, u16 sq2) | |
2014 | { | |
c6a1fa12 | 2015 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2016 | } |
2017 | ||
2018 | static inline u16 seq_inc(u16 sq) | |
2019 | { | |
c6a1fa12 | 2020 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2021 | } |
2022 | ||
2023 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2024 | { | |
c6a1fa12 | 2025 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2026 | } |
2027 | ||
2028 | ||
71364716 RR |
2029 | /* |
2030 | * As it function blongs to Rx path it must be called with | |
2031 | * the proper rcu_read_lock protection for its flow. | |
2032 | */ | |
c6a1fa12 JB |
2033 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2034 | struct tid_ampdu_rx *tid_agg_rx, | |
2035 | struct sk_buff *skb, | |
2036 | u16 mpdu_seq_num, | |
2037 | int bar_req) | |
b580781e RR |
2038 | { |
2039 | struct ieee80211_local *local = hw_to_local(hw); | |
2040 | struct ieee80211_rx_status status; | |
2041 | u16 head_seq_num, buf_size; | |
2042 | int index; | |
8318d78a JB |
2043 | struct ieee80211_supported_band *sband; |
2044 | struct ieee80211_rate *rate; | |
b580781e RR |
2045 | |
2046 | buf_size = tid_agg_rx->buf_size; | |
2047 | head_seq_num = tid_agg_rx->head_seq_num; | |
2048 | ||
2049 | /* frame with out of date sequence number */ | |
2050 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2051 | dev_kfree_skb(skb); | |
2052 | return 1; | |
2053 | } | |
2054 | ||
2055 | /* if frame sequence number exceeds our buffering window size or | |
2056 | * block Ack Request arrived - release stored frames */ | |
2057 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2058 | /* new head to the ordering buffer */ | |
2059 | if (bar_req) | |
2060 | head_seq_num = mpdu_seq_num; | |
2061 | else | |
2062 | head_seq_num = | |
2063 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2064 | /* release stored frames up to new head to stack */ | |
2065 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2066 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2067 | tid_agg_rx->ssn) | |
2068 | % tid_agg_rx->buf_size; | |
2069 | ||
2070 | if (tid_agg_rx->reorder_buf[index]) { | |
2071 | /* release the reordered frames to stack */ | |
2072 | memcpy(&status, | |
2073 | tid_agg_rx->reorder_buf[index]->cb, | |
2074 | sizeof(status)); | |
8318d78a | 2075 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2076 | if (status.flag & RX_FLAG_HT) { |
2077 | /* TODO: HT rates */ | |
2078 | rate = sband->bitrates; | |
2079 | } else { | |
2080 | rate = &sband->bitrates | |
2081 | [status.rate_idx]; | |
2082 | } | |
b580781e RR |
2083 | __ieee80211_rx_handle_packet(hw, |
2084 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2085 | &status, rate); |
b580781e RR |
2086 | tid_agg_rx->stored_mpdu_num--; |
2087 | tid_agg_rx->reorder_buf[index] = NULL; | |
2088 | } | |
2089 | tid_agg_rx->head_seq_num = | |
2090 | seq_inc(tid_agg_rx->head_seq_num); | |
2091 | } | |
2092 | if (bar_req) | |
2093 | return 1; | |
2094 | } | |
2095 | ||
2096 | /* now the new frame is always in the range of the reordering */ | |
2097 | /* buffer window */ | |
2098 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2099 | % tid_agg_rx->buf_size; | |
2100 | /* check if we already stored this frame */ | |
2101 | if (tid_agg_rx->reorder_buf[index]) { | |
2102 | dev_kfree_skb(skb); | |
2103 | return 1; | |
2104 | } | |
2105 | ||
2106 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2107 | /* release it immediately */ | |
2108 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2109 | tid_agg_rx->stored_mpdu_num == 0) { | |
2110 | tid_agg_rx->head_seq_num = | |
2111 | seq_inc(tid_agg_rx->head_seq_num); | |
2112 | return 0; | |
2113 | } | |
2114 | ||
2115 | /* put the frame in the reordering buffer */ | |
2116 | tid_agg_rx->reorder_buf[index] = skb; | |
2117 | tid_agg_rx->stored_mpdu_num++; | |
2118 | /* release the buffer until next missing frame */ | |
2119 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2120 | % tid_agg_rx->buf_size; | |
2121 | while (tid_agg_rx->reorder_buf[index]) { | |
2122 | /* release the reordered frame back to stack */ | |
2123 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2124 | sizeof(status)); | |
8318d78a | 2125 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2126 | if (status.flag & RX_FLAG_HT) |
2127 | rate = sband->bitrates; /* TODO: HT rates */ | |
2128 | else | |
2129 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2130 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2131 | &status, rate); |
b580781e RR |
2132 | tid_agg_rx->stored_mpdu_num--; |
2133 | tid_agg_rx->reorder_buf[index] = NULL; | |
2134 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2135 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2136 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2137 | } | |
2138 | return 1; | |
2139 | } | |
2140 | ||
71ebb4aa RR |
2141 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2142 | struct sk_buff *skb) | |
b580781e RR |
2143 | { |
2144 | struct ieee80211_hw *hw = &local->hw; | |
2145 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2146 | struct sta_info *sta; | |
2147 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2148 | u16 sc; |
b580781e | 2149 | u16 mpdu_seq_num; |
182503ab | 2150 | u8 ret = 0; |
b580781e RR |
2151 | int tid; |
2152 | ||
2153 | sta = sta_info_get(local, hdr->addr2); | |
2154 | if (!sta) | |
2155 | return ret; | |
2156 | ||
b580781e RR |
2157 | /* filter the QoS data rx stream according to |
2158 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2159 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2160 | goto end_reorder; |
2161 | ||
238f74a2 | 2162 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2163 | |
cee24a3e | 2164 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2165 | goto end_reorder; |
2166 | ||
cee24a3e RR |
2167 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2168 | ||
2560b6e2 EG |
2169 | /* qos null data frames are excluded */ |
2170 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2171 | goto end_reorder; |
2172 | ||
2173 | /* new un-ordered ampdu frame - process it */ | |
2174 | ||
2175 | /* reset session timer */ | |
2176 | if (tid_agg_rx->timeout) { | |
2177 | unsigned long expires = | |
2178 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2179 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2180 | } | |
2181 | ||
2182 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2183 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2184 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2185 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2186 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2187 | ret = 1; | |
2188 | goto end_reorder; | |
2189 | } | |
2190 | ||
2191 | /* according to mpdu sequence number deal with reordering buffer */ | |
2192 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2193 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2194 | mpdu_seq_num, 0); | |
d0709a65 | 2195 | end_reorder: |
b580781e RR |
2196 | return ret; |
2197 | } | |
2198 | ||
6368e4b1 RR |
2199 | /* |
2200 | * This is the receive path handler. It is called by a low level driver when an | |
2201 | * 802.11 MPDU is received from the hardware. | |
2202 | */ | |
2203 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2204 | struct ieee80211_rx_status *status) | |
2205 | { | |
2206 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2207 | struct ieee80211_rate *rate = NULL; |
2208 | struct ieee80211_supported_band *sband; | |
2209 | ||
2210 | if (status->band < 0 || | |
13d8fd2d | 2211 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2212 | WARN_ON(1); |
2213 | return; | |
2214 | } | |
2215 | ||
2216 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2217 | if (!sband) { |
8318d78a JB |
2218 | WARN_ON(1); |
2219 | return; | |
2220 | } | |
2221 | ||
0fb8ca45 JM |
2222 | if (status->flag & RX_FLAG_HT) { |
2223 | /* rate_idx is MCS index */ | |
2224 | if (WARN_ON(status->rate_idx < 0 || | |
2225 | status->rate_idx >= 76)) | |
2226 | return; | |
2227 | /* HT rates are not in the table - use the highest legacy rate | |
2228 | * for now since other parts of mac80211 may not yet be fully | |
2229 | * MCS aware. */ | |
2230 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2231 | } else { | |
2232 | if (WARN_ON(status->rate_idx < 0 || | |
2233 | status->rate_idx >= sband->n_bitrates)) | |
2234 | return; | |
2235 | rate = &sband->bitrates[status->rate_idx]; | |
2236 | } | |
6368e4b1 RR |
2237 | |
2238 | /* | |
2239 | * key references and virtual interfaces are protected using RCU | |
2240 | * and this requires that we are in a read-side RCU section during | |
2241 | * receive processing | |
2242 | */ | |
2243 | rcu_read_lock(); | |
2244 | ||
2245 | /* | |
2246 | * Frames with failed FCS/PLCP checksum are not returned, | |
2247 | * all other frames are returned without radiotap header | |
2248 | * if it was previously present. | |
2249 | * Also, frames with less than 16 bytes are dropped. | |
2250 | */ | |
8318d78a | 2251 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2252 | if (!skb) { |
2253 | rcu_read_unlock(); | |
2254 | return; | |
2255 | } | |
2256 | ||
b580781e | 2257 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2258 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2259 | |
2260 | rcu_read_unlock(); | |
2261 | } | |
571ecf67 JB |
2262 | EXPORT_SYMBOL(__ieee80211_rx); |
2263 | ||
2264 | /* This is a version of the rx handler that can be called from hard irq | |
2265 | * context. Post the skb on the queue and schedule the tasklet */ | |
2266 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2267 | struct ieee80211_rx_status *status) | |
2268 | { | |
2269 | struct ieee80211_local *local = hw_to_local(hw); | |
2270 | ||
2271 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2272 | ||
2273 | skb->dev = local->mdev; | |
2274 | /* copy status into skb->cb for use by tasklet */ | |
2275 | memcpy(skb->cb, status, sizeof(*status)); | |
2276 | skb->pkt_type = IEEE80211_RX_MSG; | |
2277 | skb_queue_tail(&local->skb_queue, skb); | |
2278 | tasklet_schedule(&local->tasklet); | |
2279 | } | |
2280 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |