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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 | ||
71364716 RR |
29 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
30 | struct tid_ampdu_rx *tid_agg_rx, | |
31 | struct sk_buff *skb, u16 mpdu_seq_num, | |
32 | int bar_req); | |
b2e7771e JB |
33 | /* |
34 | * monitor mode reception | |
35 | * | |
36 | * This function cleans up the SKB, i.e. it removes all the stuff | |
37 | * only useful for monitoring. | |
38 | */ | |
39 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
40 | struct sk_buff *skb, | |
41 | int rtap_len) | |
42 | { | |
43 | skb_pull(skb, rtap_len); | |
44 | ||
45 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
46 | if (likely(skb->len > FCS_LEN)) | |
47 | skb_trim(skb, skb->len - FCS_LEN); | |
48 | else { | |
49 | /* driver bug */ | |
50 | WARN_ON(1); | |
51 | dev_kfree_skb(skb); | |
52 | skb = NULL; | |
53 | } | |
54 | } | |
55 | ||
56 | return skb; | |
57 | } | |
58 | ||
59 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
60 | struct sk_buff *skb, | |
61 | int present_fcs_len, | |
62 | int radiotap_len) | |
63 | { | |
64 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
65 | ||
66 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
67 | return 1; | |
68 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
69 | return 1; | |
87228f57 HH |
70 | if (ieee80211_is_ctl(hdr->frame_control) && |
71 | !ieee80211_is_pspoll(hdr->frame_control) && | |
72 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
73 | return 1; |
74 | return 0; | |
75 | } | |
76 | ||
601ae7f2 BR |
77 | static int |
78 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
79 | struct ieee80211_rx_status *status) | |
80 | { | |
81 | int len; | |
82 | ||
83 | /* always present fields */ | |
84 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
85 | ||
86 | if (status->flag & RX_FLAG_TSFT) | |
87 | len += 8; | |
88 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB || | |
89 | local->hw.flags & IEEE80211_HW_SIGNAL_DBM) | |
90 | len += 1; | |
91 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
92 | len += 1; | |
93 | ||
94 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
95 | len++; | |
96 | ||
97 | /* make sure radiotap starts at a naturally aligned address */ | |
98 | if (len % 8) | |
99 | len = roundup(len, 8); | |
100 | ||
101 | return len; | |
102 | } | |
103 | ||
104 | /** | |
105 | * ieee80211_add_rx_radiotap_header - add radiotap header | |
106 | * | |
107 | * add a radiotap header containing all the fields which the hardware provided. | |
108 | */ | |
109 | static void | |
110 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
111 | struct sk_buff *skb, | |
112 | struct ieee80211_rx_status *status, | |
113 | struct ieee80211_rate *rate, | |
114 | int rtap_len) | |
115 | { | |
116 | struct ieee80211_radiotap_header *rthdr; | |
117 | unsigned char *pos; | |
118 | ||
119 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
120 | memset(rthdr, 0, rtap_len); | |
121 | ||
122 | /* radiotap header, set always present flags */ | |
123 | rthdr->it_present = | |
124 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
125 | (1 << IEEE80211_RADIOTAP_RATE) | | |
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; | |
146 | pos++; | |
147 | ||
148 | /* IEEE80211_RADIOTAP_RATE */ | |
149 | *pos = rate->bitrate / 5; | |
150 | pos++; | |
151 | ||
152 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
153 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
154 | pos += 2; | |
155 | if (status->band == IEEE80211_BAND_5GHZ) | |
156 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
157 | IEEE80211_CHAN_5GHZ); | |
158 | else | |
159 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN | | |
160 | IEEE80211_CHAN_2GHZ); | |
161 | pos += 2; | |
162 | ||
163 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
164 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
165 | *pos = status->signal; | |
166 | rthdr->it_present |= | |
167 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
168 | pos++; | |
169 | } | |
170 | ||
171 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
172 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
173 | *pos = status->noise; | |
174 | rthdr->it_present |= | |
175 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
176 | pos++; | |
177 | } | |
178 | ||
179 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
180 | ||
181 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
182 | *pos = status->antenna; | |
183 | pos++; | |
184 | ||
185 | /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */ | |
186 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) { | |
187 | *pos = status->signal; | |
188 | rthdr->it_present |= | |
189 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL); | |
190 | pos++; | |
191 | } | |
192 | ||
193 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ | |
194 | ||
195 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
196 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
197 | if ((pos - (unsigned char *)rthdr) & 1) | |
198 | pos++; | |
199 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
200 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
201 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
202 | pos += 2; | |
203 | } | |
204 | ||
b2e7771e JB |
205 | /* |
206 | * This function copies a received frame to all monitor interfaces and | |
207 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
208 | * radiotap header the driver might have added. | |
209 | */ | |
210 | static struct sk_buff * | |
211 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
212 | struct ieee80211_rx_status *status, |
213 | struct ieee80211_rate *rate) | |
b2e7771e JB |
214 | { |
215 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 216 | int needed_headroom = 0; |
b2e7771e JB |
217 | struct sk_buff *skb, *skb2; |
218 | struct net_device *prev_dev = NULL; | |
219 | int present_fcs_len = 0; | |
220 | int rtap_len = 0; | |
221 | ||
222 | /* | |
223 | * First, we may need to make a copy of the skb because | |
224 | * (1) we need to modify it for radiotap (if not present), and | |
225 | * (2) the other RX handlers will modify the skb we got. | |
226 | * | |
227 | * We don't need to, of course, if we aren't going to return | |
228 | * the SKB because it has a bad FCS/PLCP checksum. | |
229 | */ | |
230 | if (status->flag & RX_FLAG_RADIOTAP) | |
231 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
232 | else | |
601ae7f2 BR |
233 | /* room for the radiotap header based on driver features */ |
234 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
235 | |
236 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
237 | present_fcs_len = FCS_LEN; | |
238 | ||
239 | if (!local->monitors) { | |
240 | if (should_drop_frame(status, origskb, present_fcs_len, | |
241 | rtap_len)) { | |
242 | dev_kfree_skb(origskb); | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | return remove_monitor_info(local, origskb, rtap_len); | |
247 | } | |
248 | ||
249 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
250 | /* only need to expand headroom if necessary */ | |
251 | skb = origskb; | |
252 | origskb = NULL; | |
253 | ||
254 | /* | |
255 | * This shouldn't trigger often because most devices have an | |
256 | * RX header they pull before we get here, and that should | |
257 | * be big enough for our radiotap information. We should | |
258 | * probably export the length to drivers so that we can have | |
259 | * them allocate enough headroom to start with. | |
260 | */ | |
261 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 262 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
263 | dev_kfree_skb(skb); |
264 | return NULL; | |
265 | } | |
266 | } else { | |
267 | /* | |
268 | * Need to make a copy and possibly remove radiotap header | |
269 | * and FCS from the original. | |
270 | */ | |
271 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
272 | ||
273 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
274 | ||
275 | if (!skb) | |
276 | return origskb; | |
277 | } | |
278 | ||
279 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
280 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
281 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
282 | needed_headroom); | |
b2e7771e | 283 | |
ce3edf6d | 284 | skb_reset_mac_header(skb); |
b2e7771e JB |
285 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
286 | skb->pkt_type = PACKET_OTHERHOST; | |
287 | skb->protocol = htons(ETH_P_802_2); | |
288 | ||
289 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
290 | if (!netif_running(sdata->dev)) | |
291 | continue; | |
292 | ||
51fb61e7 | 293 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
294 | continue; |
295 | ||
3d30d949 MW |
296 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
297 | continue; | |
298 | ||
b2e7771e JB |
299 | if (prev_dev) { |
300 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
301 | if (skb2) { | |
302 | skb2->dev = prev_dev; | |
303 | netif_rx(skb2); | |
304 | } | |
305 | } | |
306 | ||
307 | prev_dev = sdata->dev; | |
308 | sdata->dev->stats.rx_packets++; | |
309 | sdata->dev->stats.rx_bytes += skb->len; | |
310 | } | |
311 | ||
312 | if (prev_dev) { | |
313 | skb->dev = prev_dev; | |
314 | netif_rx(skb); | |
315 | } else | |
316 | dev_kfree_skb(skb); | |
317 | ||
318 | return origskb; | |
319 | } | |
320 | ||
321 | ||
5cf121c3 | 322 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d JB |
323 | { |
324 | u8 *data = rx->skb->data; | |
325 | int tid; | |
326 | ||
327 | /* does the frame have a qos control field? */ | |
328 | if (WLAN_FC_IS_QOS_DATA(rx->fc)) { | |
329 | u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN; | |
330 | /* frame has qos control */ | |
331 | tid = qc[0] & QOS_CONTROL_TID_MASK; | |
fd4c7f2f | 332 | if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
5cf121c3 | 333 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 334 | else |
5cf121c3 | 335 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d JB |
336 | } else { |
337 | if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) { | |
338 | /* Separate TID for management frames */ | |
339 | tid = NUM_RX_DATA_QUEUES - 1; | |
340 | } else { | |
341 | /* no qos control present */ | |
342 | tid = 0; /* 802.1d - Best Effort */ | |
343 | } | |
344 | } | |
52865dfd | 345 | |
5cf121c3 | 346 | rx->queue = tid; |
6e0d114d JB |
347 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
348 | * For now, set skb->priority to 0 for other cases. */ | |
349 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 350 | } |
6e0d114d | 351 | |
5cf121c3 | 352 | static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx) |
38f3714d JB |
353 | { |
354 | #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT | |
355 | int hdrlen; | |
356 | ||
357 | if (!WLAN_FC_DATA_PRESENT(rx->fc)) | |
358 | return; | |
359 | ||
360 | /* | |
361 | * Drivers are required to align the payload data in a way that | |
362 | * guarantees that the contained IP header is aligned to a four- | |
363 | * byte boundary. In the case of regular frames, this simply means | |
364 | * aligning the payload to a four-byte boundary (because either | |
365 | * the IP header is directly contained, or IV/RFC1042 headers that | |
366 | * have a length divisible by four are in front of it. | |
367 | * | |
368 | * With A-MSDU frames, however, the payload data address must | |
369 | * yield two modulo four because there are 14-byte 802.3 headers | |
370 | * within the A-MSDU frames that push the IP header further back | |
371 | * to a multiple of four again. Thankfully, the specs were sane | |
372 | * enough this time around to require padding each A-MSDU subframe | |
373 | * to a length that is a multiple of four. | |
374 | * | |
375 | * Padding like atheros hardware adds which is inbetween the 802.11 | |
376 | * header and the payload is not supported, the driver is required | |
377 | * to move the 802.11 header further back in that case. | |
378 | */ | |
379 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
5cf121c3 | 380 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d JB |
381 | hdrlen += ETH_HLEN; |
382 | WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3); | |
383 | #endif | |
6e0d114d JB |
384 | } |
385 | ||
6368e4b1 | 386 | |
571ecf67 JB |
387 | /* rx handlers */ |
388 | ||
9ae54c84 | 389 | static ieee80211_rx_result |
5cf121c3 | 390 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
391 | { |
392 | struct ieee80211_local *local = rx->local; | |
393 | struct sk_buff *skb = rx->skb; | |
394 | ||
ece8eddd | 395 | if (unlikely(local->sta_hw_scanning)) |
5cf121c3 | 396 | return ieee80211_sta_rx_scan(rx->dev, skb, rx->status); |
ece8eddd ZY |
397 | |
398 | if (unlikely(local->sta_sw_scanning)) { | |
399 | /* drop all the other packets during a software scan anyway */ | |
5cf121c3 | 400 | if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status) |
9ae54c84 | 401 | != RX_QUEUED) |
ece8eddd | 402 | dev_kfree_skb(skb); |
9ae54c84 | 403 | return RX_QUEUED; |
571ecf67 JB |
404 | } |
405 | ||
5cf121c3 | 406 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
407 | /* scanning finished during invoking of handlers */ |
408 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 409 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
410 | } |
411 | ||
9ae54c84 | 412 | return RX_CONTINUE; |
571ecf67 JB |
413 | } |
414 | ||
33b64eb2 | 415 | static ieee80211_rx_result |
5cf121c3 | 416 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 LCC |
417 | { |
418 | int hdrlen = ieee80211_get_hdrlen(rx->fc); | |
419 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
d6d1a5a7 JB |
420 | |
421 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
422 | ||
33b64eb2 LCC |
423 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) { |
424 | if (!((rx->fc & IEEE80211_FCTL_FROMDS) && | |
425 | (rx->fc & IEEE80211_FCTL_TODS))) | |
426 | return RX_DROP_MONITOR; | |
427 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
428 | return RX_DROP_MONITOR; | |
429 | } | |
430 | ||
431 | /* If there is not an established peer link and this is not a peer link | |
432 | * establisment frame, beacon or probe, drop the frame. | |
433 | */ | |
434 | ||
b4e08ea1 | 435 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 436 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 437 | |
33b64eb2 LCC |
438 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) |
439 | return RX_DROP_MONITOR; | |
440 | ||
441 | switch (rx->fc & IEEE80211_FCTL_STYPE) { | |
442 | case IEEE80211_STYPE_ACTION: | |
443 | mgmt = (struct ieee80211_mgmt *)hdr; | |
444 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
445 | return RX_DROP_MONITOR; | |
446 | /* fall through on else */ | |
447 | case IEEE80211_STYPE_PROBE_REQ: | |
448 | case IEEE80211_STYPE_PROBE_RESP: | |
449 | case IEEE80211_STYPE_BEACON: | |
450 | return RX_CONTINUE; | |
451 | break; | |
452 | default: | |
453 | return RX_DROP_MONITOR; | |
454 | } | |
455 | ||
456 | } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
966a5428 | 457 | is_multicast_ether_addr(hdr->addr1) && |
33b64eb2 LCC |
458 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev)) |
459 | return RX_DROP_MONITOR; | |
902acc78 | 460 | #undef msh_h_get |
d6d1a5a7 | 461 | |
902acc78 JB |
462 | return RX_CONTINUE; |
463 | } | |
33b64eb2 LCC |
464 | |
465 | ||
9ae54c84 | 466 | static ieee80211_rx_result |
5cf121c3 | 467 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 JB |
468 | { |
469 | struct ieee80211_hdr *hdr; | |
33b64eb2 | 470 | |
571ecf67 JB |
471 | hdr = (struct ieee80211_hdr *) rx->skb->data; |
472 | ||
473 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
474 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
475 | if (unlikely(rx->fc & IEEE80211_FCTL_RETRY && | |
5cf121c3 | 476 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 477 | hdr->seq_ctrl)) { |
5cf121c3 | 478 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
479 | rx->local->dot11FrameDuplicateCount++; |
480 | rx->sta->num_duplicates++; | |
481 | } | |
e4c26add | 482 | return RX_DROP_MONITOR; |
571ecf67 | 483 | } else |
5cf121c3 | 484 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
485 | } |
486 | ||
571ecf67 JB |
487 | if (unlikely(rx->skb->len < 16)) { |
488 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 489 | return RX_DROP_MONITOR; |
571ecf67 JB |
490 | } |
491 | ||
571ecf67 JB |
492 | /* Drop disallowed frame classes based on STA auth/assoc state; |
493 | * IEEE 802.11, Chap 5.5. | |
494 | * | |
495 | * 80211.o does filtering only based on association state, i.e., it | |
496 | * drops Class 3 frames from not associated stations. hostapd sends | |
497 | * deauth/disassoc frames when needed. In addition, hostapd is | |
498 | * responsible for filtering on both auth and assoc states. | |
499 | */ | |
33b64eb2 | 500 | |
902acc78 | 501 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 502 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 503 | |
571ecf67 JB |
504 | if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA || |
505 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL && | |
506 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) && | |
51fb61e7 | 507 | rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && |
07346f81 | 508 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
571ecf67 JB |
509 | if ((!(rx->fc & IEEE80211_FCTL_FROMDS) && |
510 | !(rx->fc & IEEE80211_FCTL_TODS) && | |
511 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) | |
5cf121c3 | 512 | || !(rx->flags & IEEE80211_RX_RA_MATCH)) { |
571ecf67 JB |
513 | /* Drop IBSS frames and frames for other hosts |
514 | * silently. */ | |
e4c26add | 515 | return RX_DROP_MONITOR; |
571ecf67 JB |
516 | } |
517 | ||
e4c26add | 518 | return RX_DROP_MONITOR; |
571ecf67 JB |
519 | } |
520 | ||
9ae54c84 | 521 | return RX_CONTINUE; |
570bd537 JB |
522 | } |
523 | ||
524 | ||
9ae54c84 | 525 | static ieee80211_rx_result |
5cf121c3 | 526 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 JB |
527 | { |
528 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
3017b80b JB |
529 | int keyidx; |
530 | int hdrlen; | |
e4c26add | 531 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 532 | struct ieee80211_key *stakey = NULL; |
570bd537 | 533 | |
3017b80b JB |
534 | /* |
535 | * Key selection 101 | |
536 | * | |
537 | * There are three types of keys: | |
538 | * - GTK (group keys) | |
539 | * - PTK (pairwise keys) | |
540 | * - STK (station-to-station pairwise keys) | |
541 | * | |
542 | * When selecting a key, we have to distinguish between multicast | |
543 | * (including broadcast) and unicast frames, the latter can only | |
544 | * use PTKs and STKs while the former always use GTKs. Unless, of | |
545 | * course, actual WEP keys ("pre-RSNA") are used, then unicast | |
546 | * frames can also use key indizes like GTKs. Hence, if we don't | |
547 | * have a PTK/STK we check the key index for a WEP key. | |
548 | * | |
8dc06a1c JB |
549 | * Note that in a regular BSS, multicast frames are sent by the |
550 | * AP only, associated stations unicast the frame to the AP first | |
551 | * which then multicasts it on their behalf. | |
552 | * | |
3017b80b JB |
553 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
554 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
555 | * The spec seems to expect that one negotiates the same key with |
556 | * every station but there's no such requirement; VLANs could be | |
557 | * possible. | |
3017b80b JB |
558 | */ |
559 | ||
560 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) | |
9ae54c84 | 561 | return RX_CONTINUE; |
571ecf67 | 562 | |
3017b80b | 563 | /* |
1990af8d | 564 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
565 | * addressed to us nor a multicast frame. |
566 | */ | |
5cf121c3 | 567 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 568 | return RX_CONTINUE; |
3017b80b | 569 | |
d4e46a3d JB |
570 | if (rx->sta) |
571 | stakey = rcu_dereference(rx->sta->key); | |
572 | ||
573 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
574 | rx->key = stakey; | |
571ecf67 | 575 | } else { |
3017b80b JB |
576 | /* |
577 | * The device doesn't give us the IV so we won't be | |
578 | * able to look up the key. That's ok though, we | |
579 | * don't need to decrypt the frame, we just won't | |
580 | * be able to keep statistics accurate. | |
581 | * Except for key threshold notifications, should | |
582 | * we somehow allow the driver to tell us which key | |
583 | * the hardware used if this flag is set? | |
584 | */ | |
5cf121c3 JB |
585 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
586 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 587 | return RX_CONTINUE; |
3017b80b JB |
588 | |
589 | hdrlen = ieee80211_get_hdrlen(rx->fc); | |
590 | ||
591 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 592 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
593 | |
594 | /* | |
595 | * no need to call ieee80211_wep_get_keyidx, | |
596 | * it verifies a bunch of things we've done already | |
597 | */ | |
598 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
599 | ||
d4e46a3d | 600 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
601 | |
602 | /* | |
603 | * RSNA-protected unicast frames should always be sent with | |
604 | * pairwise or station-to-station keys, but for WEP we allow | |
605 | * using a key index as well. | |
606 | */ | |
8f20fc24 | 607 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
608 | !is_multicast_ether_addr(hdr->addr1)) |
609 | rx->key = NULL; | |
571ecf67 JB |
610 | } |
611 | ||
3017b80b | 612 | if (rx->key) { |
571ecf67 | 613 | rx->key->tx_rx_count++; |
011bfcc4 | 614 | /* TODO: add threshold stuff again */ |
1990af8d | 615 | } else { |
7f3ad894 | 616 | #ifdef CONFIG_MAC80211_DEBUG |
70f08765 JB |
617 | if (net_ratelimit()) |
618 | printk(KERN_DEBUG "%s: RX protected frame," | |
619 | " but have no key\n", rx->dev->name); | |
7f3ad894 | 620 | #endif /* CONFIG_MAC80211_DEBUG */ |
e4c26add | 621 | return RX_DROP_MONITOR; |
70f08765 JB |
622 | } |
623 | ||
1990af8d JB |
624 | /* Check for weak IVs if possible */ |
625 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
626 | ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
5cf121c3 JB |
627 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
628 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
629 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
630 | rx->sta->wep_weak_iv_count++; | |
631 | ||
70f08765 JB |
632 | switch (rx->key->conf.alg) { |
633 | case ALG_WEP: | |
e2f036da MN |
634 | result = ieee80211_crypto_wep_decrypt(rx); |
635 | break; | |
70f08765 | 636 | case ALG_TKIP: |
e2f036da MN |
637 | result = ieee80211_crypto_tkip_decrypt(rx); |
638 | break; | |
70f08765 | 639 | case ALG_CCMP: |
e2f036da MN |
640 | result = ieee80211_crypto_ccmp_decrypt(rx); |
641 | break; | |
70f08765 JB |
642 | } |
643 | ||
e2f036da | 644 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 645 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
646 | |
647 | return result; | |
70f08765 JB |
648 | } |
649 | ||
571ecf67 JB |
650 | static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) |
651 | { | |
652 | struct ieee80211_sub_if_data *sdata; | |
0795af57 JP |
653 | DECLARE_MAC_BUF(mac); |
654 | ||
d0709a65 | 655 | sdata = sta->sdata; |
571ecf67 JB |
656 | |
657 | if (sdata->bss) | |
658 | atomic_inc(&sdata->bss->num_sta_ps); | |
07346f81 | 659 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
571ecf67 | 660 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
661 | printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n", |
662 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 JB |
663 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
664 | } | |
665 | ||
666 | static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) | |
667 | { | |
668 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
669 | struct sk_buff *skb; | |
670 | int sent = 0; | |
671 | struct ieee80211_sub_if_data *sdata; | |
e039fa4a | 672 | struct ieee80211_tx_info *info; |
0795af57 | 673 | DECLARE_MAC_BUF(mac); |
571ecf67 | 674 | |
d0709a65 | 675 | sdata = sta->sdata; |
004c872e | 676 | |
571ecf67 JB |
677 | if (sdata->bss) |
678 | atomic_dec(&sdata->bss->num_sta_ps); | |
004c872e | 679 | |
07346f81 | 680 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
004c872e JB |
681 | |
682 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
683 | sta_info_clear_tim_bit(sta); | |
684 | ||
571ecf67 | 685 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0795af57 JP |
686 | printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n", |
687 | dev->name, print_mac(mac, sta->addr), sta->aid); | |
571ecf67 | 688 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 689 | |
571ecf67 JB |
690 | /* Send all buffered frames to the station */ |
691 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
e039fa4a | 692 | info = IEEE80211_SKB_CB(skb); |
571ecf67 | 693 | sent++; |
e039fa4a | 694 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
571ecf67 JB |
695 | dev_queue_xmit(skb); |
696 | } | |
697 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
e039fa4a | 698 | info = IEEE80211_SKB_CB(skb); |
571ecf67 JB |
699 | local->total_ps_buffered--; |
700 | sent++; | |
701 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 | 702 | printk(KERN_DEBUG "%s: STA %s aid %d send PS frame " |
571ecf67 | 703 | "since STA not sleeping anymore\n", dev->name, |
0795af57 | 704 | print_mac(mac, sta->addr), sta->aid); |
571ecf67 | 705 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
e039fa4a | 706 | info->flags |= IEEE80211_TX_CTL_REQUEUE; |
571ecf67 JB |
707 | dev_queue_xmit(skb); |
708 | } | |
709 | ||
710 | return sent; | |
711 | } | |
712 | ||
9ae54c84 | 713 | static ieee80211_rx_result |
5cf121c3 | 714 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
715 | { |
716 | struct sta_info *sta = rx->sta; | |
717 | struct net_device *dev = rx->dev; | |
718 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
719 | ||
720 | if (!sta) | |
9ae54c84 | 721 | return RX_CONTINUE; |
571ecf67 JB |
722 | |
723 | /* Update last_rx only for IBSS packets which are for the current | |
724 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
725 | * other STAs are using different BSSID. */ | |
51fb61e7 | 726 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { |
71364716 RR |
727 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
728 | IEEE80211_IF_TYPE_IBSS); | |
571ecf67 JB |
729 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
730 | sta->last_rx = jiffies; | |
731 | } else | |
732 | if (!is_multicast_ether_addr(hdr->addr1) || | |
51fb61e7 | 733 | rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) { |
571ecf67 JB |
734 | /* Update last_rx only for unicast frames in order to prevent |
735 | * the Probe Request frames (the only broadcast frames from a | |
736 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
737 | * Mesh beacons will update last_rx when if they are found to |
738 | * match the current local configuration when processed. | |
571ecf67 JB |
739 | */ |
740 | sta->last_rx = jiffies; | |
741 | } | |
742 | ||
5cf121c3 | 743 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 744 | return RX_CONTINUE; |
571ecf67 JB |
745 | |
746 | sta->rx_fragments++; | |
747 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 748 | sta->last_signal = rx->status->signal; |
566bfe5a | 749 | sta->last_qual = rx->status->qual; |
5cf121c3 | 750 | sta->last_noise = rx->status->noise; |
571ecf67 JB |
751 | |
752 | if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) { | |
753 | /* Change STA power saving mode only in the end of a frame | |
754 | * exchange sequence */ | |
07346f81 JB |
755 | if (test_sta_flags(sta, WLAN_STA_PS) && |
756 | !(rx->fc & IEEE80211_FCTL_PM)) | |
5cf121c3 | 757 | rx->sent_ps_buffered += ap_sta_ps_end(dev, sta); |
07346f81 | 758 | else if (!test_sta_flags(sta, WLAN_STA_PS) && |
571ecf67 JB |
759 | (rx->fc & IEEE80211_FCTL_PM)) |
760 | ap_sta_ps_start(dev, sta); | |
761 | } | |
762 | ||
763 | /* Drop data::nullfunc frames silently, since they are used only to | |
764 | * control station power saving mode. */ | |
765 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
766 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) { | |
767 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); | |
768 | /* Update counter and free packet here to avoid counting this | |
769 | * as a dropped packed. */ | |
770 | sta->rx_packets++; | |
771 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 772 | return RX_QUEUED; |
571ecf67 JB |
773 | } |
774 | ||
9ae54c84 | 775 | return RX_CONTINUE; |
571ecf67 JB |
776 | } /* ieee80211_rx_h_sta_process */ |
777 | ||
571ecf67 JB |
778 | static inline struct ieee80211_fragment_entry * |
779 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
780 | unsigned int frag, unsigned int seq, int rx_queue, | |
781 | struct sk_buff **skb) | |
782 | { | |
783 | struct ieee80211_fragment_entry *entry; | |
784 | int idx; | |
785 | ||
786 | idx = sdata->fragment_next; | |
787 | entry = &sdata->fragments[sdata->fragment_next++]; | |
788 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
789 | sdata->fragment_next = 0; | |
790 | ||
791 | if (!skb_queue_empty(&entry->skb_list)) { | |
792 | #ifdef CONFIG_MAC80211_DEBUG | |
793 | struct ieee80211_hdr *hdr = | |
794 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
0795af57 JP |
795 | DECLARE_MAC_BUF(mac); |
796 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
797 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
798 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0795af57 | 799 | "addr1=%s addr2=%s\n", |
571ecf67 JB |
800 | sdata->dev->name, idx, |
801 | jiffies - entry->first_frag_time, entry->seq, | |
0795af57 JP |
802 | entry->last_frag, print_mac(mac, hdr->addr1), |
803 | print_mac(mac2, hdr->addr2)); | |
571ecf67 JB |
804 | #endif /* CONFIG_MAC80211_DEBUG */ |
805 | __skb_queue_purge(&entry->skb_list); | |
806 | } | |
807 | ||
808 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
809 | *skb = NULL; | |
810 | entry->first_frag_time = jiffies; | |
811 | entry->seq = seq; | |
812 | entry->rx_queue = rx_queue; | |
813 | entry->last_frag = frag; | |
814 | entry->ccmp = 0; | |
815 | entry->extra_len = 0; | |
816 | ||
817 | return entry; | |
818 | } | |
819 | ||
820 | static inline struct ieee80211_fragment_entry * | |
821 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
822 | u16 fc, unsigned int frag, unsigned int seq, | |
823 | int rx_queue, struct ieee80211_hdr *hdr) | |
824 | { | |
825 | struct ieee80211_fragment_entry *entry; | |
826 | int i, idx; | |
827 | ||
828 | idx = sdata->fragment_next; | |
829 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
830 | struct ieee80211_hdr *f_hdr; | |
831 | u16 f_fc; | |
832 | ||
833 | idx--; | |
834 | if (idx < 0) | |
835 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
836 | ||
837 | entry = &sdata->fragments[idx]; | |
838 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
839 | entry->rx_queue != rx_queue || | |
840 | entry->last_frag + 1 != frag) | |
841 | continue; | |
842 | ||
843 | f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data; | |
844 | f_fc = le16_to_cpu(f_hdr->frame_control); | |
845 | ||
846 | if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) || | |
847 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || | |
848 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
849 | continue; | |
850 | ||
ab46623e | 851 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
852 | __skb_queue_purge(&entry->skb_list); |
853 | continue; | |
854 | } | |
855 | return entry; | |
856 | } | |
857 | ||
858 | return NULL; | |
859 | } | |
860 | ||
9ae54c84 | 861 | static ieee80211_rx_result |
5cf121c3 | 862 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
863 | { |
864 | struct ieee80211_hdr *hdr; | |
865 | u16 sc; | |
866 | unsigned int frag, seq; | |
867 | struct ieee80211_fragment_entry *entry; | |
868 | struct sk_buff *skb; | |
0795af57 | 869 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
870 | |
871 | hdr = (struct ieee80211_hdr *) rx->skb->data; | |
872 | sc = le16_to_cpu(hdr->seq_ctrl); | |
873 | frag = sc & IEEE80211_SCTL_FRAG; | |
874 | ||
875 | if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) || | |
876 | (rx->skb)->len < 24 || | |
877 | is_multicast_ether_addr(hdr->addr1))) { | |
878 | /* not fragmented */ | |
879 | goto out; | |
880 | } | |
881 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
882 | ||
883 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
884 | ||
885 | if (frag == 0) { | |
886 | /* This is the first fragment of a new frame. */ | |
887 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 888 | rx->queue, &(rx->skb)); |
8f20fc24 | 889 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
571ecf67 JB |
890 | (rx->fc & IEEE80211_FCTL_PROTECTED)) { |
891 | /* Store CCMP PN so that we can verify that the next | |
892 | * fragment has a sequential PN value. */ | |
893 | entry->ccmp = 1; | |
894 | memcpy(entry->last_pn, | |
5cf121c3 | 895 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
896 | CCMP_PN_LEN); |
897 | } | |
9ae54c84 | 898 | return RX_QUEUED; |
571ecf67 JB |
899 | } |
900 | ||
901 | /* This is a fragment for a frame that should already be pending in | |
902 | * fragment cache. Add this fragment to the end of the pending entry. | |
903 | */ | |
904 | entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq, | |
5cf121c3 | 905 | rx->queue, hdr); |
571ecf67 JB |
906 | if (!entry) { |
907 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 908 | return RX_DROP_MONITOR; |
571ecf67 JB |
909 | } |
910 | ||
911 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
912 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
913 | if (entry->ccmp) { | |
914 | int i; | |
915 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 916 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 917 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
918 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
919 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
920 | pn[i]++; | |
921 | if (pn[i]) | |
922 | break; | |
923 | } | |
5cf121c3 | 924 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
571ecf67 | 925 | if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { |
1a84f3fd JB |
926 | if (net_ratelimit()) |
927 | printk(KERN_DEBUG "%s: defrag: CCMP PN not " | |
0795af57 | 928 | "sequential A2=%s" |
1a84f3fd JB |
929 | " PN=%02x%02x%02x%02x%02x%02x " |
930 | "(expected %02x%02x%02x%02x%02x%02x)\n", | |
0795af57 | 931 | rx->dev->name, print_mac(mac, hdr->addr2), |
1a84f3fd JB |
932 | rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], |
933 | rpn[5], pn[0], pn[1], pn[2], pn[3], | |
934 | pn[4], pn[5]); | |
e4c26add | 935 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
936 | } |
937 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); | |
938 | } | |
939 | ||
940 | skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); | |
941 | __skb_queue_tail(&entry->skb_list, rx->skb); | |
942 | entry->last_frag = frag; | |
943 | entry->extra_len += rx->skb->len; | |
944 | if (rx->fc & IEEE80211_FCTL_MOREFRAGS) { | |
945 | rx->skb = NULL; | |
9ae54c84 | 946 | return RX_QUEUED; |
571ecf67 JB |
947 | } |
948 | ||
949 | rx->skb = __skb_dequeue(&entry->skb_list); | |
950 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
951 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
952 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
953 | GFP_ATOMIC))) { | |
954 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
955 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 956 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
957 | } |
958 | } | |
959 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
960 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
961 | dev_kfree_skb(skb); | |
962 | } | |
963 | ||
964 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 965 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
966 | |
967 | out: | |
968 | if (rx->sta) | |
969 | rx->sta->rx_packets++; | |
970 | if (is_multicast_ether_addr(hdr->addr1)) | |
971 | rx->local->dot11MulticastReceivedFrameCount++; | |
972 | else | |
973 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 974 | return RX_CONTINUE; |
571ecf67 JB |
975 | } |
976 | ||
9ae54c84 | 977 | static ieee80211_rx_result |
5cf121c3 | 978 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 979 | { |
98f0b0a3 | 980 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
981 | struct sk_buff *skb; |
982 | int no_pending_pkts; | |
0795af57 | 983 | DECLARE_MAC_BUF(mac); |
571ecf67 JB |
984 | |
985 | if (likely(!rx->sta || | |
986 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL || | |
987 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL || | |
5cf121c3 | 988 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 989 | return RX_CONTINUE; |
571ecf67 | 990 | |
51fb61e7 JB |
991 | if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) && |
992 | (sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) | |
e4c26add | 993 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 994 | |
571ecf67 JB |
995 | skb = skb_dequeue(&rx->sta->tx_filtered); |
996 | if (!skb) { | |
997 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
998 | if (skb) | |
999 | rx->local->total_ps_buffered--; | |
1000 | } | |
1001 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1002 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1003 | ||
1004 | if (skb) { | |
1005 | struct ieee80211_hdr *hdr = | |
1006 | (struct ieee80211_hdr *) skb->data; | |
1007 | ||
4a9a66e9 JB |
1008 | /* |
1009 | * Tell TX path to send one frame even though the STA may | |
1010 | * still remain is PS mode after this frame exchange. | |
1011 | */ | |
07346f81 | 1012 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1013 | |
1014 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0795af57 JP |
1015 | printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n", |
1016 | print_mac(mac, rx->sta->addr), rx->sta->aid, | |
571ecf67 JB |
1017 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1018 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1019 | ||
1020 | /* Use MoreData flag to indicate whether there are more | |
1021 | * buffered frames for this STA */ | |
836341a7 | 1022 | if (no_pending_pkts) |
571ecf67 | 1023 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1024 | else |
571ecf67 JB |
1025 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1026 | ||
1027 | dev_queue_xmit(skb); | |
1028 | ||
004c872e JB |
1029 | if (no_pending_pkts) |
1030 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1031 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1032 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1033 | /* |
1034 | * FIXME: This can be the result of a race condition between | |
1035 | * us expiring a frame and the station polling for it. | |
1036 | * Should we send it a null-func frame indicating we | |
1037 | * have nothing buffered for it? | |
1038 | */ | |
0795af57 | 1039 | printk(KERN_DEBUG "%s: STA %s sent PS Poll even " |
571ecf67 | 1040 | "though there is no buffered frames for it\n", |
0795af57 | 1041 | rx->dev->name, print_mac(mac, rx->sta->addr)); |
571ecf67 | 1042 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1043 | } |
1044 | ||
9ae54c84 | 1045 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1046 | * count as an dropped frame. */ |
1047 | dev_kfree_skb(rx->skb); | |
1048 | ||
9ae54c84 | 1049 | return RX_QUEUED; |
571ecf67 JB |
1050 | } |
1051 | ||
9ae54c84 | 1052 | static ieee80211_rx_result |
5cf121c3 | 1053 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d JB |
1054 | { |
1055 | u16 fc = rx->fc; | |
1056 | u8 *data = rx->skb->data; | |
1057 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data; | |
1058 | ||
1059 | if (!WLAN_FC_IS_QOS_DATA(fc)) | |
9ae54c84 | 1060 | return RX_CONTINUE; |
6e0d114d JB |
1061 | |
1062 | /* remove the qos control field, update frame type and meta-data */ | |
1063 | memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2); | |
1064 | hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2); | |
1065 | /* change frame type to non QOS */ | |
1066 | rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA; | |
1067 | hdr->frame_control = cpu_to_le16(fc); | |
1068 | ||
9ae54c84 | 1069 | return RX_CONTINUE; |
6e0d114d JB |
1070 | } |
1071 | ||
76ee65bf | 1072 | static int |
5cf121c3 | 1073 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1074 | { |
07346f81 JB |
1075 | if (unlikely(!rx->sta || |
1076 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) { | |
571ecf67 | 1077 | #ifdef CONFIG_MAC80211_DEBUG |
238814fd JB |
1078 | if (net_ratelimit()) |
1079 | printk(KERN_DEBUG "%s: dropped frame " | |
1080 | "(unauthorized port)\n", rx->dev->name); | |
571ecf67 | 1081 | #endif /* CONFIG_MAC80211_DEBUG */ |
76ee65bf | 1082 | return -EACCES; |
571ecf67 JB |
1083 | } |
1084 | ||
76ee65bf | 1085 | return 0; |
571ecf67 JB |
1086 | } |
1087 | ||
76ee65bf | 1088 | static int |
5cf121c3 | 1089 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx) |
571ecf67 | 1090 | { |
3017b80b | 1091 | /* |
7848ba7d JB |
1092 | * Pass through unencrypted frames if the hardware has |
1093 | * decrypted them already. | |
3017b80b | 1094 | */ |
5cf121c3 | 1095 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1096 | return 0; |
571ecf67 JB |
1097 | |
1098 | /* Drop unencrypted frames if key is set. */ | |
1099 | if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) && | |
1100 | (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
1101 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC && | |
b3fc9c6c | 1102 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1103 | return -EACCES; |
b3fc9c6c | 1104 | |
76ee65bf | 1105 | return 0; |
571ecf67 JB |
1106 | } |
1107 | ||
76ee65bf | 1108 | static int |
5cf121c3 | 1109 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1110 | { |
1111 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1112 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
1113 | u16 fc, hdrlen, ethertype; | |
1114 | u8 *payload; | |
1115 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1116 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1117 | struct sk_buff *skb = rx->skb; |
571ecf67 | 1118 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
0795af57 JP |
1119 | DECLARE_MAC_BUF(mac); |
1120 | DECLARE_MAC_BUF(mac2); | |
1121 | DECLARE_MAC_BUF(mac3); | |
1122 | DECLARE_MAC_BUF(mac4); | |
571ecf67 JB |
1123 | |
1124 | fc = rx->fc; | |
571ecf67 JB |
1125 | |
1126 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
76ee65bf | 1127 | return -1; |
571ecf67 JB |
1128 | |
1129 | hdrlen = ieee80211_get_hdrlen(fc); | |
1130 | ||
902acc78 | 1131 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
33b64eb2 LCC |
1132 | int meshhdrlen = ieee80211_get_mesh_hdrlen( |
1133 | (struct ieee80211s_hdr *) (skb->data + hdrlen)); | |
1134 | /* Copy on cb: | |
1135 | * - mesh header: to be used for mesh forwarding | |
1136 | * decision. It will also be used as mesh header template at | |
1137 | * tx.c:ieee80211_subif_start_xmit() if interface | |
1138 | * type is mesh and skb->pkt_type == PACKET_OTHERHOST | |
1139 | * - ta: to be used if a RERR needs to be sent. | |
1140 | */ | |
1141 | memcpy(skb->cb, skb->data + hdrlen, meshhdrlen); | |
1142 | memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN); | |
1143 | hdrlen += meshhdrlen; | |
1144 | } | |
33b64eb2 | 1145 | |
571ecf67 JB |
1146 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet |
1147 | * header | |
1148 | * IEEE 802.11 address fields: | |
1149 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1150 | * 0 0 DA SA BSSID n/a | |
1151 | * 0 1 DA BSSID SA n/a | |
1152 | * 1 0 BSSID SA DA n/a | |
1153 | * 1 1 RA TA DA SA | |
1154 | */ | |
1155 | ||
1156 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
1157 | case IEEE80211_FCTL_TODS: | |
1158 | /* BSSID SA DA */ | |
1159 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1160 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1161 | ||
51fb61e7 JB |
1162 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP && |
1163 | sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) { | |
1a84f3fd JB |
1164 | if (net_ratelimit()) |
1165 | printk(KERN_DEBUG "%s: dropped ToDS frame " | |
0795af57 | 1166 | "(BSSID=%s SA=%s DA=%s)\n", |
1a84f3fd | 1167 | dev->name, |
0795af57 JP |
1168 | print_mac(mac, hdr->addr1), |
1169 | print_mac(mac2, hdr->addr2), | |
1170 | print_mac(mac3, hdr->addr3)); | |
76ee65bf | 1171 | return -1; |
571ecf67 JB |
1172 | } |
1173 | break; | |
1174 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
1175 | /* RA TA DA SA */ | |
1176 | memcpy(dst, hdr->addr3, ETH_ALEN); | |
1177 | memcpy(src, hdr->addr4, ETH_ALEN); | |
1178 | ||
33b64eb2 LCC |
1179 | if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS && |
1180 | sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)) { | |
1181 | if (net_ratelimit()) | |
1182 | printk(KERN_DEBUG "%s: dropped FromDS&ToDS " | |
0795af57 | 1183 | "frame (RA=%s TA=%s DA=%s SA=%s)\n", |
1a84f3fd | 1184 | rx->dev->name, |
0795af57 JP |
1185 | print_mac(mac, hdr->addr1), |
1186 | print_mac(mac2, hdr->addr2), | |
1187 | print_mac(mac3, hdr->addr3), | |
1188 | print_mac(mac4, hdr->addr4)); | |
76ee65bf | 1189 | return -1; |
571ecf67 JB |
1190 | } |
1191 | break; | |
1192 | case IEEE80211_FCTL_FROMDS: | |
1193 | /* DA BSSID SA */ | |
1194 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1195 | memcpy(src, hdr->addr3, ETH_ALEN); | |
1196 | ||
51fb61e7 | 1197 | if (sdata->vif.type != IEEE80211_IF_TYPE_STA || |
b3316157 JL |
1198 | (is_multicast_ether_addr(dst) && |
1199 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1200 | return -1; |
571ecf67 JB |
1201 | break; |
1202 | case 0: | |
1203 | /* DA SA BSSID */ | |
1204 | memcpy(dst, hdr->addr1, ETH_ALEN); | |
1205 | memcpy(src, hdr->addr2, ETH_ALEN); | |
1206 | ||
51fb61e7 | 1207 | if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) { |
571ecf67 | 1208 | if (net_ratelimit()) { |
0795af57 JP |
1209 | printk(KERN_DEBUG "%s: dropped IBSS frame " |
1210 | "(DA=%s SA=%s BSSID=%s)\n", | |
1211 | dev->name, | |
1212 | print_mac(mac, hdr->addr1), | |
1213 | print_mac(mac2, hdr->addr2), | |
1214 | print_mac(mac3, hdr->addr3)); | |
571ecf67 | 1215 | } |
76ee65bf | 1216 | return -1; |
571ecf67 JB |
1217 | } |
1218 | break; | |
1219 | } | |
1220 | ||
571ecf67 JB |
1221 | if (unlikely(skb->len - hdrlen < 8)) { |
1222 | if (net_ratelimit()) { | |
1223 | printk(KERN_DEBUG "%s: RX too short data frame " | |
1224 | "payload\n", dev->name); | |
1225 | } | |
76ee65bf | 1226 | return -1; |
571ecf67 JB |
1227 | } |
1228 | ||
76ee65bf | 1229 | payload = skb->data + hdrlen; |
571ecf67 JB |
1230 | ethertype = (payload[6] << 8) | payload[7]; |
1231 | ||
1232 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1233 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1234 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1235 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1236 | * replace EtherType */ | |
1237 | skb_pull(skb, hdrlen + 6); | |
1238 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1239 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1240 | } else { | |
1241 | struct ethhdr *ehdr; | |
1242 | __be16 len; | |
ce3edf6d | 1243 | |
571ecf67 JB |
1244 | skb_pull(skb, hdrlen); |
1245 | len = htons(skb->len); | |
1246 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1247 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1248 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1249 | ehdr->h_proto = len; | |
1250 | } | |
76ee65bf RR |
1251 | return 0; |
1252 | } | |
571ecf67 | 1253 | |
ce3edf6d JB |
1254 | /* |
1255 | * requires that rx->skb is a frame with ethernet header | |
1256 | */ | |
5cf121c3 | 1257 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx) |
ce3edf6d | 1258 | { |
c97c23e3 | 1259 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1260 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1261 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1262 | ||
1263 | /* | |
1264 | * Allow EAPOL frames to us/the PAE group address regardless | |
1265 | * of whether the frame was encrypted or not. | |
1266 | */ | |
1267 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1268 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1269 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1270 | return true; | |
1271 | ||
1272 | if (ieee80211_802_1x_port_control(rx) || | |
1273 | ieee80211_drop_unencrypted(rx)) | |
1274 | return false; | |
1275 | ||
1276 | return true; | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * requires that rx->skb is a frame with ethernet header | |
1281 | */ | |
76ee65bf | 1282 | static void |
5cf121c3 | 1283 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1284 | { |
1285 | struct net_device *dev = rx->dev; | |
1286 | struct ieee80211_local *local = rx->local; | |
1287 | struct sk_buff *skb, *xmit_skb; | |
1288 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1289 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1290 | struct sta_info *dsta; | |
571ecf67 | 1291 | |
76ee65bf RR |
1292 | skb = rx->skb; |
1293 | xmit_skb = NULL; | |
571ecf67 | 1294 | |
51fb61e7 JB |
1295 | if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP || |
1296 | sdata->vif.type == IEEE80211_IF_TYPE_VLAN) && | |
5cf121c3 | 1297 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1298 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1299 | /* | |
1300 | * send multicast frames both to higher layers in | |
1301 | * local net stack and back to the wireless medium | |
1302 | */ | |
76ee65bf RR |
1303 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1304 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1305 | printk(KERN_DEBUG "%s: failed to clone " |
1306 | "multicast frame\n", dev->name); | |
1307 | } else { | |
571ecf67 | 1308 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1309 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1310 | /* |
1311 | * The destination station is associated to | |
1312 | * this AP (in this VLAN), so send the frame | |
1313 | * directly to it and do not pass it to local | |
1314 | * net stack. | |
571ecf67 | 1315 | */ |
76ee65bf | 1316 | xmit_skb = skb; |
571ecf67 JB |
1317 | skb = NULL; |
1318 | } | |
571ecf67 JB |
1319 | } |
1320 | } | |
1321 | ||
33b64eb2 | 1322 | /* Mesh forwarding */ |
902acc78 | 1323 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
33b64eb2 LCC |
1324 | u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl; |
1325 | (*mesh_ttl)--; | |
1326 | ||
1327 | if (is_multicast_ether_addr(skb->data)) { | |
1328 | if (*mesh_ttl > 0) { | |
1329 | xmit_skb = skb_copy(skb, GFP_ATOMIC); | |
69687a0b LCC |
1330 | if (xmit_skb) |
1331 | xmit_skb->pkt_type = PACKET_OTHERHOST; | |
1332 | else if (net_ratelimit()) | |
33b64eb2 LCC |
1333 | printk(KERN_DEBUG "%s: failed to clone " |
1334 | "multicast frame\n", dev->name); | |
33b64eb2 | 1335 | } else |
902acc78 JB |
1336 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta, |
1337 | dropped_frames_ttl); | |
33b64eb2 LCC |
1338 | } else if (skb->pkt_type != PACKET_OTHERHOST && |
1339 | compare_ether_addr(dev->dev_addr, skb->data) != 0) { | |
1340 | if (*mesh_ttl == 0) { | |
902acc78 JB |
1341 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta, |
1342 | dropped_frames_ttl); | |
33b64eb2 LCC |
1343 | dev_kfree_skb(skb); |
1344 | skb = NULL; | |
1345 | } else { | |
1346 | xmit_skb = skb; | |
1347 | xmit_skb->pkt_type = PACKET_OTHERHOST; | |
1348 | if (!(dev->flags & IFF_PROMISC)) | |
1349 | skb = NULL; | |
1350 | } | |
1351 | } | |
1352 | } | |
33b64eb2 | 1353 | |
571ecf67 JB |
1354 | if (skb) { |
1355 | /* deliver to local stack */ | |
1356 | skb->protocol = eth_type_trans(skb, dev); | |
1357 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1358 | netif_rx(skb); | |
1359 | } | |
1360 | ||
76ee65bf | 1361 | if (xmit_skb) { |
571ecf67 | 1362 | /* send to wireless media */ |
f831e909 | 1363 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1364 | skb_reset_network_header(xmit_skb); |
1365 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1366 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1367 | } |
76ee65bf RR |
1368 | } |
1369 | ||
9ae54c84 | 1370 | static ieee80211_rx_result |
5cf121c3 | 1371 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1372 | { |
1373 | struct net_device *dev = rx->dev; | |
1374 | struct ieee80211_local *local = rx->local; | |
1375 | u16 fc, ethertype; | |
1376 | u8 *payload; | |
1377 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
1378 | const struct ethhdr *eth; | |
1379 | int remaining, err; | |
1380 | u8 dst[ETH_ALEN]; | |
1381 | u8 src[ETH_ALEN]; | |
1382 | DECLARE_MAC_BUF(mac); | |
1383 | ||
1384 | fc = rx->fc; | |
1385 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1386 | return RX_CONTINUE; |
fd4c7f2f RR |
1387 | |
1388 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1389 | return RX_DROP_MONITOR; |
fd4c7f2f | 1390 | |
5cf121c3 | 1391 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1392 | return RX_CONTINUE; |
fd4c7f2f RR |
1393 | |
1394 | err = ieee80211_data_to_8023(rx); | |
1395 | if (unlikely(err)) | |
e4c26add | 1396 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1397 | |
1398 | skb->dev = dev; | |
1399 | ||
1400 | dev->stats.rx_packets++; | |
1401 | dev->stats.rx_bytes += skb->len; | |
1402 | ||
1403 | /* skip the wrapping header */ | |
1404 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1405 | if (!eth) | |
e4c26add | 1406 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1407 | |
1408 | while (skb != frame) { | |
1409 | u8 padding; | |
1410 | __be16 len = eth->h_proto; | |
1411 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1412 | ||
1413 | remaining = skb->len; | |
1414 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1415 | memcpy(src, eth->h_source, ETH_ALEN); | |
1416 | ||
1417 | padding = ((4 - subframe_len) & 0x3); | |
1418 | /* the last MSDU has no padding */ | |
1419 | if (subframe_len > remaining) { | |
a4278e18 | 1420 | printk(KERN_DEBUG "%s: wrong buffer size\n", dev->name); |
e4c26add | 1421 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1422 | } |
1423 | ||
1424 | skb_pull(skb, sizeof(struct ethhdr)); | |
1425 | /* if last subframe reuse skb */ | |
1426 | if (remaining <= subframe_len + padding) | |
1427 | frame = skb; | |
1428 | else { | |
1429 | frame = dev_alloc_skb(local->hw.extra_tx_headroom + | |
1430 | subframe_len); | |
1431 | ||
1432 | if (frame == NULL) | |
e4c26add | 1433 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1434 | |
1435 | skb_reserve(frame, local->hw.extra_tx_headroom + | |
1436 | sizeof(struct ethhdr)); | |
1437 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
1438 | ntohs(len)); | |
1439 | ||
1440 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1441 | padding); | |
1442 | if (!eth) { | |
a4278e18 | 1443 | printk(KERN_DEBUG "%s: wrong buffer size\n", |
fd4c7f2f RR |
1444 | dev->name); |
1445 | dev_kfree_skb(frame); | |
e4c26add | 1446 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1447 | } |
1448 | } | |
1449 | ||
ce3edf6d | 1450 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1451 | frame->dev = dev; |
1452 | frame->priority = skb->priority; | |
1453 | rx->skb = frame; | |
1454 | ||
fd4c7f2f RR |
1455 | payload = frame->data; |
1456 | ethertype = (payload[6] << 8) | payload[7]; | |
1457 | ||
1458 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1459 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1460 | compare_ether_addr(payload, | |
1461 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1462 | /* remove RFC1042 or Bridge-Tunnel |
1463 | * encapsulation and replace EtherType */ | |
1464 | skb_pull(frame, 6); | |
1465 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1466 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1467 | } else { | |
ce3edf6d JB |
1468 | memcpy(skb_push(frame, sizeof(__be16)), |
1469 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1470 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1471 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1472 | } | |
1473 | ||
ce3edf6d JB |
1474 | if (!ieee80211_frame_allowed(rx)) { |
1475 | if (skb == frame) /* last frame */ | |
e4c26add | 1476 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1477 | dev_kfree_skb(frame); |
1478 | continue; | |
1479 | } | |
fd4c7f2f RR |
1480 | |
1481 | ieee80211_deliver_skb(rx); | |
1482 | } | |
1483 | ||
9ae54c84 | 1484 | return RX_QUEUED; |
fd4c7f2f RR |
1485 | } |
1486 | ||
9ae54c84 | 1487 | static ieee80211_rx_result |
5cf121c3 | 1488 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1489 | { |
1490 | struct net_device *dev = rx->dev; | |
1491 | u16 fc; | |
ce3edf6d | 1492 | int err; |
76ee65bf RR |
1493 | |
1494 | fc = rx->fc; | |
1495 | if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) | |
9ae54c84 | 1496 | return RX_CONTINUE; |
76ee65bf RR |
1497 | |
1498 | if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) | |
e4c26add | 1499 | return RX_DROP_MONITOR; |
76ee65bf | 1500 | |
76ee65bf RR |
1501 | err = ieee80211_data_to_8023(rx); |
1502 | if (unlikely(err)) | |
e4c26add | 1503 | return RX_DROP_UNUSABLE; |
76ee65bf | 1504 | |
ce3edf6d | 1505 | if (!ieee80211_frame_allowed(rx)) |
e4c26add | 1506 | return RX_DROP_MONITOR; |
ce3edf6d | 1507 | |
76ee65bf RR |
1508 | rx->skb->dev = dev; |
1509 | ||
1510 | dev->stats.rx_packets++; | |
1511 | dev->stats.rx_bytes += rx->skb->len; | |
1512 | ||
1513 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1514 | |
9ae54c84 | 1515 | return RX_QUEUED; |
571ecf67 JB |
1516 | } |
1517 | ||
9ae54c84 | 1518 | static ieee80211_rx_result |
5cf121c3 | 1519 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1520 | { |
1521 | struct ieee80211_local *local = rx->local; | |
1522 | struct ieee80211_hw *hw = &local->hw; | |
1523 | struct sk_buff *skb = rx->skb; | |
1524 | struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data; | |
1525 | struct tid_ampdu_rx *tid_agg_rx; | |
1526 | u16 start_seq_num; | |
1527 | u16 tid; | |
1528 | ||
1529 | if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL)) | |
9ae54c84 | 1530 | return RX_CONTINUE; |
71364716 RR |
1531 | |
1532 | if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) { | |
1533 | if (!rx->sta) | |
9ae54c84 | 1534 | return RX_CONTINUE; |
71364716 | 1535 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1536 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1537 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1538 | return RX_CONTINUE; |
cee24a3e | 1539 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1540 | |
1541 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1542 | ||
1543 | /* reset session timer */ | |
1544 | if (tid_agg_rx->timeout) { | |
1545 | unsigned long expires = | |
1546 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1547 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1548 | } | |
1549 | ||
1550 | /* manage reordering buffer according to requested */ | |
1551 | /* sequence number */ | |
1552 | rcu_read_lock(); | |
1553 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1554 | start_seq_num, 1); | |
1555 | rcu_read_unlock(); | |
e4c26add | 1556 | return RX_DROP_UNUSABLE; |
71364716 RR |
1557 | } |
1558 | ||
9ae54c84 | 1559 | return RX_CONTINUE; |
71364716 RR |
1560 | } |
1561 | ||
9ae54c84 | 1562 | static ieee80211_rx_result |
5cf121c3 | 1563 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1564 | { |
1565 | struct ieee80211_sub_if_data *sdata; | |
1566 | ||
5cf121c3 | 1567 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1568 | return RX_DROP_MONITOR; |
571ecf67 JB |
1569 | |
1570 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
51fb61e7 | 1571 | if ((sdata->vif.type == IEEE80211_IF_TYPE_STA || |
33b64eb2 LCC |
1572 | sdata->vif.type == IEEE80211_IF_TYPE_IBSS || |
1573 | sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) && | |
ddd3d2be | 1574 | !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
5cf121c3 | 1575 | ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status); |
f9d540ee | 1576 | else |
e4c26add | 1577 | return RX_DROP_MONITOR; |
f9d540ee | 1578 | |
9ae54c84 | 1579 | return RX_QUEUED; |
571ecf67 JB |
1580 | } |
1581 | ||
571ecf67 JB |
1582 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1583 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1584 | struct ieee80211_rx_data *rx) |
571ecf67 JB |
1585 | { |
1586 | int keyidx, hdrlen; | |
0795af57 JP |
1587 | DECLARE_MAC_BUF(mac); |
1588 | DECLARE_MAC_BUF(mac2); | |
571ecf67 JB |
1589 | |
1590 | hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); | |
1591 | if (rx->skb->len >= hdrlen + 4) | |
1592 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1593 | else | |
1594 | keyidx = -1; | |
1595 | ||
1a84f3fd JB |
1596 | if (net_ratelimit()) |
1597 | printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " | |
0795af57 JP |
1598 | "failure from %s to %s keyidx=%d\n", |
1599 | dev->name, print_mac(mac, hdr->addr2), | |
1600 | print_mac(mac2, hdr->addr1), keyidx); | |
571ecf67 | 1601 | |
8944b79f | 1602 | if (!rx->sta) { |
aa0daf0e JB |
1603 | /* |
1604 | * Some hardware seem to generate incorrect Michael MIC | |
1605 | * reports; ignore them to avoid triggering countermeasures. | |
1606 | */ | |
1a84f3fd JB |
1607 | if (net_ratelimit()) |
1608 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
0795af57 JP |
1609 | "error for unknown address %s\n", |
1610 | dev->name, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1611 | goto ignore; |
1612 | } | |
1613 | ||
1614 | if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) { | |
1a84f3fd JB |
1615 | if (net_ratelimit()) |
1616 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
aa0daf0e | 1617 | "error for a frame with no PROTECTED flag (src " |
0795af57 | 1618 | "%s)\n", dev->name, print_mac(mac, hdr->addr2)); |
571ecf67 JB |
1619 | goto ignore; |
1620 | } | |
1621 | ||
51fb61e7 | 1622 | if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) { |
aa0daf0e JB |
1623 | /* |
1624 | * APs with pairwise keys should never receive Michael MIC | |
1625 | * errors for non-zero keyidx because these are reserved for | |
1626 | * group keys and only the AP is sending real multicast | |
1627 | * frames in the BSS. | |
1628 | */ | |
eb063c17 JB |
1629 | if (net_ratelimit()) |
1630 | printk(KERN_DEBUG "%s: ignored Michael MIC error for " | |
1631 | "a frame with non-zero keyidx (%d)" | |
0795af57 JP |
1632 | " (src %s)\n", dev->name, keyidx, |
1633 | print_mac(mac, hdr->addr2)); | |
eb063c17 | 1634 | goto ignore; |
571ecf67 JB |
1635 | } |
1636 | ||
1637 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA && | |
1638 | ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || | |
1639 | (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) { | |
1a84f3fd JB |
1640 | if (net_ratelimit()) |
1641 | printk(KERN_DEBUG "%s: ignored spurious Michael MIC " | |
1642 | "error for a frame that cannot be encrypted " | |
0795af57 JP |
1643 | "(fc=0x%04x) (src %s)\n", |
1644 | dev->name, rx->fc, print_mac(mac, hdr->addr2)); | |
571ecf67 JB |
1645 | goto ignore; |
1646 | } | |
1647 | ||
eb063c17 | 1648 | mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr); |
571ecf67 JB |
1649 | ignore: |
1650 | dev_kfree_skb(rx->skb); | |
1651 | rx->skb = NULL; | |
1652 | } | |
1653 | ||
5cf121c3 JB |
1654 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1655 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1656 | { |
1657 | struct ieee80211_sub_if_data *sdata; | |
1658 | struct ieee80211_local *local = rx->local; | |
1659 | struct ieee80211_rtap_hdr { | |
1660 | struct ieee80211_radiotap_header hdr; | |
1661 | u8 flags; | |
1662 | u8 rate; | |
1663 | __le16 chan_freq; | |
1664 | __le16 chan_flags; | |
1665 | } __attribute__ ((packed)) *rthdr; | |
1666 | struct sk_buff *skb = rx->skb, *skb2; | |
1667 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1668 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1669 | |
5cf121c3 | 1670 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1671 | goto out_free_skb; |
1672 | ||
1673 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1674 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1675 | goto out_free_skb; | |
1676 | ||
1677 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1678 | memset(rthdr, 0, sizeof(*rthdr)); | |
1679 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1680 | rthdr->hdr.it_present = | |
1681 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1682 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1683 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1684 | ||
5cf121c3 | 1685 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1686 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1687 | ||
1688 | if (status->band == IEEE80211_BAND_5GHZ) | |
1689 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1690 | IEEE80211_CHAN_5GHZ); | |
1691 | else | |
1692 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1693 | IEEE80211_CHAN_2GHZ); | |
1694 | ||
1695 | skb_set_mac_header(skb, 0); | |
1696 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1697 | skb->pkt_type = PACKET_OTHERHOST; | |
1698 | skb->protocol = htons(ETH_P_802_2); | |
1699 | ||
1700 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1701 | if (!netif_running(sdata->dev)) | |
1702 | continue; | |
1703 | ||
1704 | if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR || | |
1705 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) | |
1706 | continue; | |
1707 | ||
1708 | if (prev_dev) { | |
1709 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1710 | if (skb2) { | |
1711 | skb2->dev = prev_dev; | |
1712 | netif_rx(skb2); | |
1713 | } | |
1714 | } | |
1715 | ||
1716 | prev_dev = sdata->dev; | |
1717 | sdata->dev->stats.rx_packets++; | |
1718 | sdata->dev->stats.rx_bytes += skb->len; | |
1719 | } | |
1720 | ||
1721 | if (prev_dev) { | |
1722 | skb->dev = prev_dev; | |
1723 | netif_rx(skb); | |
1724 | skb = NULL; | |
1725 | } else | |
1726 | goto out_free_skb; | |
1727 | ||
5cf121c3 | 1728 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1729 | return; |
1730 | ||
1731 | out_free_skb: | |
1732 | dev_kfree_skb(skb); | |
1733 | } | |
1734 | ||
5cf121c3 | 1735 | typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_rx_data *); |
58905290 | 1736 | static ieee80211_rx_handler ieee80211_rx_handlers[] = |
571ecf67 | 1737 | { |
571ecf67 JB |
1738 | ieee80211_rx_h_passive_scan, |
1739 | ieee80211_rx_h_check, | |
4f0d18e2 | 1740 | ieee80211_rx_h_decrypt, |
70f08765 | 1741 | ieee80211_rx_h_sta_process, |
571ecf67 JB |
1742 | ieee80211_rx_h_defragment, |
1743 | ieee80211_rx_h_ps_poll, | |
1744 | ieee80211_rx_h_michael_mic_verify, | |
1745 | /* this must be after decryption - so header is counted in MPDU mic | |
1746 | * must be before pae and data, so QOS_DATA format frames | |
1747 | * are not passed to user space by these functions | |
1748 | */ | |
1749 | ieee80211_rx_h_remove_qos_control, | |
fd4c7f2f | 1750 | ieee80211_rx_h_amsdu, |
571ecf67 | 1751 | ieee80211_rx_h_data, |
71364716 | 1752 | ieee80211_rx_h_ctrl, |
571ecf67 JB |
1753 | ieee80211_rx_h_mgmt, |
1754 | NULL | |
1755 | }; | |
1756 | ||
8944b79f | 1757 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1758 | struct ieee80211_rx_data *rx, |
8944b79f | 1759 | struct sk_buff *skb) |
58905290 JB |
1760 | { |
1761 | ieee80211_rx_handler *handler; | |
1762 | ieee80211_rx_result res = RX_DROP_MONITOR; | |
1763 | ||
8944b79f JB |
1764 | rx->skb = skb; |
1765 | rx->sdata = sdata; | |
1766 | rx->dev = sdata->dev; | |
1767 | ||
58905290 JB |
1768 | for (handler = ieee80211_rx_handlers; *handler != NULL; handler++) { |
1769 | res = (*handler)(rx); | |
1770 | ||
1771 | switch (res) { | |
1772 | case RX_CONTINUE: | |
1773 | continue; | |
1774 | case RX_DROP_UNUSABLE: | |
1775 | case RX_DROP_MONITOR: | |
8944b79f JB |
1776 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
1777 | if (rx->sta) | |
1778 | rx->sta->rx_dropped++; | |
58905290 JB |
1779 | break; |
1780 | case RX_QUEUED: | |
8944b79f | 1781 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); |
58905290 JB |
1782 | break; |
1783 | } | |
1784 | break; | |
1785 | } | |
1786 | ||
1787 | switch (res) { | |
3d30d949 | 1788 | case RX_CONTINUE: |
58905290 | 1789 | case RX_DROP_MONITOR: |
3d30d949 MW |
1790 | ieee80211_rx_cooked_monitor(rx); |
1791 | break; | |
58905290 | 1792 | case RX_DROP_UNUSABLE: |
58905290 JB |
1793 | dev_kfree_skb(rx->skb); |
1794 | break; | |
1795 | } | |
1796 | } | |
1797 | ||
571ecf67 JB |
1798 | /* main receive path */ |
1799 | ||
23a24def | 1800 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1801 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
1802 | struct ieee80211_hdr *hdr) |
1803 | { | |
1804 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
1805 | ||
51fb61e7 | 1806 | switch (sdata->vif.type) { |
23a24def JB |
1807 | case IEEE80211_IF_TYPE_STA: |
1808 | if (!bssid) | |
1809 | return 0; | |
1810 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 1811 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1812 | return 0; |
5cf121c3 | 1813 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1814 | } else if (!multicast && |
1815 | compare_ether_addr(sdata->dev->dev_addr, | |
1816 | hdr->addr1) != 0) { | |
4150c572 | 1817 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1818 | return 0; |
5cf121c3 | 1819 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1820 | } |
1821 | break; | |
1822 | case IEEE80211_IF_TYPE_IBSS: | |
1823 | if (!bssid) | |
1824 | return 0; | |
9d9bf77d | 1825 | if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && |
87291c02 VK |
1826 | (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) { |
1827 | if (!rx->sta) | |
1828 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, | |
1829 | rx->skb, bssid, hdr->addr2, | |
1830 | BIT(rx->status->rate_idx)); | |
9d9bf77d | 1831 | return 1; |
87291c02 | 1832 | } |
9d9bf77d | 1833 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 1834 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1835 | return 0; |
5cf121c3 | 1836 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1837 | } else if (!multicast && |
1838 | compare_ether_addr(sdata->dev->dev_addr, | |
1839 | hdr->addr1) != 0) { | |
4150c572 | 1840 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 1841 | return 0; |
5cf121c3 | 1842 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
1843 | } else if (!rx->sta) |
1844 | rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb, | |
87291c02 VK |
1845 | bssid, hdr->addr2, |
1846 | BIT(rx->status->rate_idx)); | |
23a24def | 1847 | break; |
6032f934 JB |
1848 | case IEEE80211_IF_TYPE_MESH_POINT: |
1849 | if (!multicast && | |
1850 | compare_ether_addr(sdata->dev->dev_addr, | |
1851 | hdr->addr1) != 0) { | |
1852 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
1853 | return 0; | |
1854 | ||
5cf121c3 | 1855 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
1856 | } |
1857 | break; | |
fb1c1cd6 | 1858 | case IEEE80211_IF_TYPE_VLAN: |
23a24def JB |
1859 | case IEEE80211_IF_TYPE_AP: |
1860 | if (!bssid) { | |
1861 | if (compare_ether_addr(sdata->dev->dev_addr, | |
1862 | hdr->addr1)) | |
1863 | return 0; | |
1864 | } else if (!ieee80211_bssid_match(bssid, | |
1865 | sdata->dev->dev_addr)) { | |
5cf121c3 | 1866 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 1867 | return 0; |
5cf121c3 | 1868 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 1869 | } |
badffb72 | 1870 | if (sdata->dev == sdata->local->mdev && |
5cf121c3 | 1871 | !(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def JB |
1872 | /* do not receive anything via |
1873 | * master device when not scanning */ | |
1874 | return 0; | |
1875 | break; | |
1876 | case IEEE80211_IF_TYPE_WDS: | |
1877 | if (bssid || | |
1878 | (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) | |
1879 | return 0; | |
1880 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
1881 | return 0; | |
1882 | break; | |
fb1c1cd6 JB |
1883 | case IEEE80211_IF_TYPE_MNTR: |
1884 | /* take everything */ | |
1885 | break; | |
a2897552 | 1886 | case IEEE80211_IF_TYPE_INVALID: |
fb1c1cd6 JB |
1887 | /* should never get here */ |
1888 | WARN_ON(1); | |
1889 | break; | |
23a24def JB |
1890 | } |
1891 | ||
1892 | return 1; | |
1893 | } | |
1894 | ||
571ecf67 | 1895 | /* |
6368e4b1 RR |
1896 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
1897 | * be called with rcu_read_lock protection. | |
571ecf67 | 1898 | */ |
71ebb4aa RR |
1899 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
1900 | struct sk_buff *skb, | |
1901 | struct ieee80211_rx_status *status, | |
8318d78a | 1902 | struct ieee80211_rate *rate) |
571ecf67 JB |
1903 | { |
1904 | struct ieee80211_local *local = hw_to_local(hw); | |
1905 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 1906 | struct ieee80211_hdr *hdr; |
5cf121c3 | 1907 | struct ieee80211_rx_data rx; |
571ecf67 | 1908 | u16 type; |
6368e4b1 | 1909 | int prepares; |
8e6f0032 JB |
1910 | struct ieee80211_sub_if_data *prev = NULL; |
1911 | struct sk_buff *skb_new; | |
1912 | u8 *bssid; | |
571ecf67 JB |
1913 | |
1914 | hdr = (struct ieee80211_hdr *) skb->data; | |
1915 | memset(&rx, 0, sizeof(rx)); | |
1916 | rx.skb = skb; | |
1917 | rx.local = local; | |
1918 | ||
5cf121c3 | 1919 | rx.status = status; |
5cf121c3 | 1920 | rx.rate = rate; |
b2e7771e | 1921 | rx.fc = le16_to_cpu(hdr->frame_control); |
571ecf67 | 1922 | type = rx.fc & IEEE80211_FCTL_FTYPE; |
72abd81b | 1923 | |
b2e7771e | 1924 | if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT) |
571ecf67 | 1925 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 1926 | |
8944b79f JB |
1927 | rx.sta = sta_info_get(local, hdr->addr2); |
1928 | if (rx.sta) { | |
d0709a65 JB |
1929 | rx.sdata = rx.sta->sdata; |
1930 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 1931 | } |
571ecf67 | 1932 | |
571ecf67 | 1933 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 1934 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 1935 | return; |
571ecf67 JB |
1936 | } |
1937 | ||
ece8eddd | 1938 | if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning)) |
5cf121c3 | 1939 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 1940 | |
38f3714d JB |
1941 | ieee80211_parse_qos(&rx); |
1942 | ieee80211_verify_ip_alignment(&rx); | |
1943 | ||
571ecf67 JB |
1944 | skb = rx.skb; |
1945 | ||
79010420 | 1946 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
1947 | if (!netif_running(sdata->dev)) |
1948 | continue; | |
1949 | ||
51fb61e7 | 1950 | if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) |
b2e7771e JB |
1951 | continue; |
1952 | ||
51fb61e7 | 1953 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 1954 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 1955 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 1956 | |
6368e4b1 | 1957 | if (!prepares) |
23a24def | 1958 | continue; |
8e6f0032 | 1959 | |
340e11f3 JB |
1960 | /* |
1961 | * frame is destined for this interface, but if it's not | |
1962 | * also for the previous one we handle that after the | |
1963 | * loop to avoid copying the SKB once too much | |
1964 | */ | |
1965 | ||
1966 | if (!prev) { | |
1967 | prev = sdata; | |
1968 | continue; | |
8e6f0032 | 1969 | } |
340e11f3 JB |
1970 | |
1971 | /* | |
1972 | * frame was destined for the previous interface | |
1973 | * so invoke RX handlers for it | |
1974 | */ | |
1975 | ||
1976 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
1977 | if (!skb_new) { | |
1978 | if (net_ratelimit()) | |
1979 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 1980 | "multicast frame for %s\n", |
dd1cd4c6 JB |
1981 | wiphy_name(local->hw.wiphy), |
1982 | prev->dev->name); | |
340e11f3 JB |
1983 | continue; |
1984 | } | |
69f817b6 | 1985 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1986 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 1987 | prev = sdata; |
571ecf67 | 1988 | } |
8e6f0032 | 1989 | if (prev) { |
69f817b6 | 1990 | rx.fc = le16_to_cpu(hdr->frame_control); |
8944b79f | 1991 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
8e6f0032 JB |
1992 | } else |
1993 | dev_kfree_skb(skb); | |
571ecf67 | 1994 | } |
6368e4b1 | 1995 | |
b580781e RR |
1996 | #define SEQ_MODULO 0x1000 |
1997 | #define SEQ_MASK 0xfff | |
1998 | ||
1999 | static inline int seq_less(u16 sq1, u16 sq2) | |
2000 | { | |
2001 | return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1)); | |
2002 | } | |
2003 | ||
2004 | static inline u16 seq_inc(u16 sq) | |
2005 | { | |
2006 | return ((sq + 1) & SEQ_MASK); | |
2007 | } | |
2008 | ||
2009 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2010 | { | |
2011 | return ((sq1 - sq2) & SEQ_MASK); | |
2012 | } | |
2013 | ||
2014 | ||
71364716 RR |
2015 | /* |
2016 | * As it function blongs to Rx path it must be called with | |
2017 | * the proper rcu_read_lock protection for its flow. | |
2018 | */ | |
b580781e RR |
2019 | u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2020 | struct tid_ampdu_rx *tid_agg_rx, | |
2021 | struct sk_buff *skb, u16 mpdu_seq_num, | |
2022 | int bar_req) | |
2023 | { | |
2024 | struct ieee80211_local *local = hw_to_local(hw); | |
2025 | struct ieee80211_rx_status status; | |
2026 | u16 head_seq_num, buf_size; | |
2027 | int index; | |
8318d78a JB |
2028 | struct ieee80211_supported_band *sband; |
2029 | struct ieee80211_rate *rate; | |
b580781e RR |
2030 | |
2031 | buf_size = tid_agg_rx->buf_size; | |
2032 | head_seq_num = tid_agg_rx->head_seq_num; | |
2033 | ||
2034 | /* frame with out of date sequence number */ | |
2035 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2036 | dev_kfree_skb(skb); | |
2037 | return 1; | |
2038 | } | |
2039 | ||
2040 | /* if frame sequence number exceeds our buffering window size or | |
2041 | * block Ack Request arrived - release stored frames */ | |
2042 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2043 | /* new head to the ordering buffer */ | |
2044 | if (bar_req) | |
2045 | head_seq_num = mpdu_seq_num; | |
2046 | else | |
2047 | head_seq_num = | |
2048 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2049 | /* release stored frames up to new head to stack */ | |
2050 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2051 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2052 | tid_agg_rx->ssn) | |
2053 | % tid_agg_rx->buf_size; | |
2054 | ||
2055 | if (tid_agg_rx->reorder_buf[index]) { | |
2056 | /* release the reordered frames to stack */ | |
2057 | memcpy(&status, | |
2058 | tid_agg_rx->reorder_buf[index]->cb, | |
2059 | sizeof(status)); | |
8318d78a JB |
2060 | sband = local->hw.wiphy->bands[status.band]; |
2061 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e RR |
2062 | __ieee80211_rx_handle_packet(hw, |
2063 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2064 | &status, rate); |
b580781e RR |
2065 | tid_agg_rx->stored_mpdu_num--; |
2066 | tid_agg_rx->reorder_buf[index] = NULL; | |
2067 | } | |
2068 | tid_agg_rx->head_seq_num = | |
2069 | seq_inc(tid_agg_rx->head_seq_num); | |
2070 | } | |
2071 | if (bar_req) | |
2072 | return 1; | |
2073 | } | |
2074 | ||
2075 | /* now the new frame is always in the range of the reordering */ | |
2076 | /* buffer window */ | |
2077 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2078 | % tid_agg_rx->buf_size; | |
2079 | /* check if we already stored this frame */ | |
2080 | if (tid_agg_rx->reorder_buf[index]) { | |
2081 | dev_kfree_skb(skb); | |
2082 | return 1; | |
2083 | } | |
2084 | ||
2085 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2086 | /* release it immediately */ | |
2087 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2088 | tid_agg_rx->stored_mpdu_num == 0) { | |
2089 | tid_agg_rx->head_seq_num = | |
2090 | seq_inc(tid_agg_rx->head_seq_num); | |
2091 | return 0; | |
2092 | } | |
2093 | ||
2094 | /* put the frame in the reordering buffer */ | |
2095 | tid_agg_rx->reorder_buf[index] = skb; | |
2096 | tid_agg_rx->stored_mpdu_num++; | |
2097 | /* release the buffer until next missing frame */ | |
2098 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2099 | % tid_agg_rx->buf_size; | |
2100 | while (tid_agg_rx->reorder_buf[index]) { | |
2101 | /* release the reordered frame back to stack */ | |
2102 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2103 | sizeof(status)); | |
8318d78a JB |
2104 | sband = local->hw.wiphy->bands[status.band]; |
2105 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2106 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2107 | &status, rate); |
b580781e RR |
2108 | tid_agg_rx->stored_mpdu_num--; |
2109 | tid_agg_rx->reorder_buf[index] = NULL; | |
2110 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2111 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2112 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2113 | } | |
2114 | return 1; | |
2115 | } | |
2116 | ||
71ebb4aa RR |
2117 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2118 | struct sk_buff *skb) | |
b580781e RR |
2119 | { |
2120 | struct ieee80211_hw *hw = &local->hw; | |
2121 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2122 | struct sta_info *sta; | |
2123 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2124 | u16 sc; |
b580781e RR |
2125 | u16 mpdu_seq_num; |
2126 | u8 ret = 0, *qc; | |
2127 | int tid; | |
2128 | ||
2129 | sta = sta_info_get(local, hdr->addr2); | |
2130 | if (!sta) | |
2131 | return ret; | |
2132 | ||
b580781e RR |
2133 | /* filter the QoS data rx stream according to |
2134 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2135 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2136 | goto end_reorder; |
2137 | ||
87228f57 | 2138 | qc = ieee80211_get_qos_ctl(hdr); |
b580781e | 2139 | tid = qc[0] & QOS_CONTROL_TID_MASK; |
b580781e | 2140 | |
cee24a3e | 2141 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2142 | goto end_reorder; |
2143 | ||
cee24a3e RR |
2144 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2145 | ||
b580781e | 2146 | /* null data frames are excluded */ |
87228f57 | 2147 | if (unlikely(ieee80211_is_nullfunc(hdr->frame_control))) |
b580781e RR |
2148 | goto end_reorder; |
2149 | ||
2150 | /* new un-ordered ampdu frame - process it */ | |
2151 | ||
2152 | /* reset session timer */ | |
2153 | if (tid_agg_rx->timeout) { | |
2154 | unsigned long expires = | |
2155 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2156 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2157 | } | |
2158 | ||
2159 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2160 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2161 | if (sc & IEEE80211_SCTL_FRAG) { | |
d0709a65 | 2162 | ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr, |
b580781e RR |
2163 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2164 | ret = 1; | |
2165 | goto end_reorder; | |
2166 | } | |
2167 | ||
2168 | /* according to mpdu sequence number deal with reordering buffer */ | |
2169 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2170 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2171 | mpdu_seq_num, 0); | |
d0709a65 | 2172 | end_reorder: |
b580781e RR |
2173 | return ret; |
2174 | } | |
2175 | ||
6368e4b1 RR |
2176 | /* |
2177 | * This is the receive path handler. It is called by a low level driver when an | |
2178 | * 802.11 MPDU is received from the hardware. | |
2179 | */ | |
2180 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2181 | struct ieee80211_rx_status *status) | |
2182 | { | |
2183 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2184 | struct ieee80211_rate *rate = NULL; |
2185 | struct ieee80211_supported_band *sband; | |
2186 | ||
2187 | if (status->band < 0 || | |
13d8fd2d | 2188 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2189 | WARN_ON(1); |
2190 | return; | |
2191 | } | |
2192 | ||
2193 | sband = local->hw.wiphy->bands[status->band]; | |
2194 | ||
2195 | if (!sband || | |
2196 | status->rate_idx < 0 || | |
2197 | status->rate_idx >= sband->n_bitrates) { | |
2198 | WARN_ON(1); | |
2199 | return; | |
2200 | } | |
2201 | ||
2202 | rate = &sband->bitrates[status->rate_idx]; | |
6368e4b1 RR |
2203 | |
2204 | /* | |
2205 | * key references and virtual interfaces are protected using RCU | |
2206 | * and this requires that we are in a read-side RCU section during | |
2207 | * receive processing | |
2208 | */ | |
2209 | rcu_read_lock(); | |
2210 | ||
2211 | /* | |
2212 | * Frames with failed FCS/PLCP checksum are not returned, | |
2213 | * all other frames are returned without radiotap header | |
2214 | * if it was previously present. | |
2215 | * Also, frames with less than 16 bytes are dropped. | |
2216 | */ | |
8318d78a | 2217 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2218 | if (!skb) { |
2219 | rcu_read_unlock(); | |
2220 | return; | |
2221 | } | |
2222 | ||
b580781e | 2223 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2224 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2225 | |
2226 | rcu_read_unlock(); | |
2227 | } | |
571ecf67 JB |
2228 | EXPORT_SYMBOL(__ieee80211_rx); |
2229 | ||
2230 | /* This is a version of the rx handler that can be called from hard irq | |
2231 | * context. Post the skb on the queue and schedule the tasklet */ | |
2232 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2233 | struct ieee80211_rx_status *status) | |
2234 | { | |
2235 | struct ieee80211_local *local = hw_to_local(hw); | |
2236 | ||
2237 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2238 | ||
2239 | skb->dev = local->mdev; | |
2240 | /* copy status into skb->cb for use by tasklet */ | |
2241 | memcpy(skb->cb, status, sizeof(*status)); | |
2242 | skb->pkt_type = IEEE80211_RX_MSG; | |
2243 | skb_queue_tail(&local->skb_queue, skb); | |
2244 | tasklet_schedule(&local->tasklet); | |
2245 | } | |
2246 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |