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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; | |
7fee5372 | 89 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
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 | ||
d1c3a37c | 104 | /* |
601ae7f2 BR |
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) | | |
601ae7f2 BR |
125 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
126 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
127 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
128 | rthdr->it_len = cpu_to_le16(rtap_len); | |
129 | ||
130 | pos = (unsigned char *)(rthdr+1); | |
131 | ||
132 | /* the order of the following fields is important */ | |
133 | ||
134 | /* IEEE80211_RADIOTAP_TSFT */ | |
135 | if (status->flag & RX_FLAG_TSFT) { | |
136 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
137 | rthdr->it_present |= | |
138 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
139 | pos += 8; | |
140 | } | |
141 | ||
142 | /* IEEE80211_RADIOTAP_FLAGS */ | |
143 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
144 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
b4f28bbb BR |
145 | if (status->flag & RX_FLAG_SHORTPRE) |
146 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
147 | pos++; |
148 | ||
149 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
150 | if (status->flag & RX_FLAG_HT) { |
151 | /* | |
152 | * TODO: add following information into radiotap header once | |
153 | * suitable fields are defined for it: | |
154 | * - MCS index (status->rate_idx) | |
155 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
156 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
157 | */ | |
158 | *pos = 0; | |
8d6f658e | 159 | } else { |
ebe6c7ba | 160 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 161 | *pos = rate->bitrate / 5; |
8d6f658e | 162 | } |
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 | ||
601ae7f2 BR |
201 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
202 | ||
203 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
204 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
205 | if ((pos - (unsigned char *)rthdr) & 1) | |
206 | pos++; | |
207 | /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */ | |
208 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
209 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS); | |
210 | pos += 2; | |
211 | } | |
212 | ||
b2e7771e JB |
213 | /* |
214 | * This function copies a received frame to all monitor interfaces and | |
215 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
216 | * radiotap header the driver might have added. | |
217 | */ | |
218 | static struct sk_buff * | |
219 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
220 | struct ieee80211_rx_status *status, |
221 | struct ieee80211_rate *rate) | |
b2e7771e JB |
222 | { |
223 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 224 | int needed_headroom = 0; |
b2e7771e JB |
225 | struct sk_buff *skb, *skb2; |
226 | struct net_device *prev_dev = NULL; | |
227 | int present_fcs_len = 0; | |
228 | int rtap_len = 0; | |
229 | ||
230 | /* | |
231 | * First, we may need to make a copy of the skb because | |
232 | * (1) we need to modify it for radiotap (if not present), and | |
233 | * (2) the other RX handlers will modify the skb we got. | |
234 | * | |
235 | * We don't need to, of course, if we aren't going to return | |
236 | * the SKB because it has a bad FCS/PLCP checksum. | |
237 | */ | |
238 | if (status->flag & RX_FLAG_RADIOTAP) | |
239 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
240 | else | |
601ae7f2 BR |
241 | /* room for the radiotap header based on driver features */ |
242 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
243 | |
244 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
245 | present_fcs_len = FCS_LEN; | |
246 | ||
247 | if (!local->monitors) { | |
248 | if (should_drop_frame(status, origskb, present_fcs_len, | |
249 | rtap_len)) { | |
250 | dev_kfree_skb(origskb); | |
251 | return NULL; | |
252 | } | |
253 | ||
254 | return remove_monitor_info(local, origskb, rtap_len); | |
255 | } | |
256 | ||
257 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
258 | /* only need to expand headroom if necessary */ | |
259 | skb = origskb; | |
260 | origskb = NULL; | |
261 | ||
262 | /* | |
263 | * This shouldn't trigger often because most devices have an | |
264 | * RX header they pull before we get here, and that should | |
265 | * be big enough for our radiotap information. We should | |
266 | * probably export the length to drivers so that we can have | |
267 | * them allocate enough headroom to start with. | |
268 | */ | |
269 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 270 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
271 | dev_kfree_skb(skb); |
272 | return NULL; | |
273 | } | |
274 | } else { | |
275 | /* | |
276 | * Need to make a copy and possibly remove radiotap header | |
277 | * and FCS from the original. | |
278 | */ | |
279 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
280 | ||
281 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
282 | ||
283 | if (!skb) | |
284 | return origskb; | |
285 | } | |
286 | ||
287 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
288 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
289 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
290 | needed_headroom); | |
b2e7771e | 291 | |
ce3edf6d | 292 | skb_reset_mac_header(skb); |
b2e7771e JB |
293 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
294 | skb->pkt_type = PACKET_OTHERHOST; | |
295 | skb->protocol = htons(ETH_P_802_2); | |
296 | ||
297 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
298 | if (!netif_running(sdata->dev)) | |
299 | continue; | |
300 | ||
05c914fe | 301 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
302 | continue; |
303 | ||
3d30d949 MW |
304 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
305 | continue; | |
306 | ||
b2e7771e JB |
307 | if (prev_dev) { |
308 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
309 | if (skb2) { | |
310 | skb2->dev = prev_dev; | |
311 | netif_rx(skb2); | |
312 | } | |
313 | } | |
314 | ||
315 | prev_dev = sdata->dev; | |
316 | sdata->dev->stats.rx_packets++; | |
317 | sdata->dev->stats.rx_bytes += skb->len; | |
318 | } | |
319 | ||
320 | if (prev_dev) { | |
321 | skb->dev = prev_dev; | |
322 | netif_rx(skb); | |
323 | } else | |
324 | dev_kfree_skb(skb); | |
325 | ||
326 | return origskb; | |
327 | } | |
328 | ||
329 | ||
5cf121c3 | 330 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 331 | { |
238f74a2 | 332 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
333 | int tid; |
334 | ||
335 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
336 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
337 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 338 | /* frame has qos control */ |
238f74a2 HH |
339 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
340 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 341 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 342 | else |
5cf121c3 | 343 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 344 | } else { |
1411f9b5 JB |
345 | /* |
346 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
347 | * | |
348 | * Sequence numbers for management frames, QoS data | |
349 | * frames with a broadcast/multicast address in the | |
350 | * Address 1 field, and all non-QoS data frames sent | |
351 | * by QoS STAs are assigned using an additional single | |
352 | * modulo-4096 counter, [...] | |
353 | * | |
354 | * We also use that counter for non-QoS STAs. | |
355 | */ | |
356 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 357 | } |
52865dfd | 358 | |
5cf121c3 | 359 | rx->queue = tid; |
6e0d114d JB |
360 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
361 | * For now, set skb->priority to 0 for other cases. */ | |
362 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 363 | } |
6e0d114d | 364 | |
d1c3a37c JB |
365 | /** |
366 | * DOC: Packet alignment | |
367 | * | |
368 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
369 | * to the stack. | |
370 | * | |
371 | * Additionally, should, if possible, align the payload data in a way that | |
372 | * guarantees that the contained IP header is aligned to a four-byte | |
373 | * boundary. In the case of regular frames, this simply means aligning the | |
374 | * payload to a four-byte boundary (because either the IP header is directly | |
375 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
376 | * in front of it). | |
377 | * | |
378 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
379 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
380 | * push the IP header further back to a multiple of four again. Thankfully, the | |
381 | * specs were sane enough this time around to require padding each A-MSDU | |
382 | * subframe to a length that is a multiple of four. | |
383 | * | |
384 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
385 | * the payload is not supported, the driver is required to move the 802.11 | |
386 | * header to be directly in front of the payload in that case. | |
387 | */ | |
388 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 389 | { |
a7767f95 | 390 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
391 | int hdrlen; |
392 | ||
d1c3a37c JB |
393 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
394 | return; | |
395 | #endif | |
396 | ||
397 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
398 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
399 | return; | |
400 | ||
a7767f95 | 401 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
402 | return; |
403 | ||
a7767f95 | 404 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 405 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 406 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
407 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
408 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
409 | } |
410 | ||
6368e4b1 | 411 | |
571ecf67 JB |
412 | /* rx handlers */ |
413 | ||
49461622 | 414 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 415 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
416 | { |
417 | struct ieee80211_local *local = rx->local; | |
418 | struct sk_buff *skb = rx->skb; | |
419 | ||
c2b13452 JB |
420 | if (unlikely(local->hw_scanning)) |
421 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 422 | |
c2b13452 | 423 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 424 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 425 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 426 | != RX_QUEUED) |
ece8eddd | 427 | dev_kfree_skb(skb); |
9ae54c84 | 428 | return RX_QUEUED; |
571ecf67 JB |
429 | } |
430 | ||
5cf121c3 | 431 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
432 | /* scanning finished during invoking of handlers */ |
433 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 434 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
435 | } |
436 | ||
9ae54c84 | 437 | return RX_CONTINUE; |
571ecf67 JB |
438 | } |
439 | ||
3cfcf6ac JM |
440 | |
441 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
442 | { | |
443 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
444 | ||
445 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
446 | return 0; | |
447 | ||
448 | return ieee80211_is_robust_mgmt_frame(hdr); | |
449 | } | |
450 | ||
451 | ||
452 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
453 | { | |
454 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
455 | ||
456 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
457 | return 0; | |
458 | ||
459 | return ieee80211_is_robust_mgmt_frame(hdr); | |
460 | } | |
461 | ||
462 | ||
463 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
464 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
465 | { | |
466 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
467 | struct ieee80211_mmie *mmie; | |
468 | ||
469 | if (skb->len < 24 + sizeof(*mmie) || | |
470 | !is_multicast_ether_addr(hdr->da)) | |
471 | return -1; | |
472 | ||
473 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
474 | return -1; /* not a robust management frame */ | |
475 | ||
476 | mmie = (struct ieee80211_mmie *) | |
477 | (skb->data + skb->len - sizeof(*mmie)); | |
478 | if (mmie->element_id != WLAN_EID_MMIE || | |
479 | mmie->length != sizeof(*mmie) - 2) | |
480 | return -1; | |
481 | ||
482 | return le16_to_cpu(mmie->key_id); | |
483 | } | |
484 | ||
485 | ||
33b64eb2 | 486 | static ieee80211_rx_result |
5cf121c3 | 487 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 488 | { |
a7767f95 HH |
489 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
490 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 491 | |
a7767f95 HH |
492 | if (ieee80211_is_data(hdr->frame_control)) { |
493 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
494 | return RX_DROP_MONITOR; |
495 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
496 | return RX_DROP_MONITOR; | |
497 | } | |
498 | ||
499 | /* If there is not an established peer link and this is not a peer link | |
500 | * establisment frame, beacon or probe, drop the frame. | |
501 | */ | |
502 | ||
b4e08ea1 | 503 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 504 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 505 | |
a7767f95 | 506 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
507 | return RX_DROP_MONITOR; |
508 | ||
a7767f95 | 509 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
510 | mgmt = (struct ieee80211_mgmt *)hdr; |
511 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
512 | return RX_DROP_MONITOR; | |
33b64eb2 | 513 | return RX_CONTINUE; |
33b64eb2 LCC |
514 | } |
515 | ||
a7767f95 HH |
516 | if (ieee80211_is_probe_req(hdr->frame_control) || |
517 | ieee80211_is_probe_resp(hdr->frame_control) || | |
518 | ieee80211_is_beacon(hdr->frame_control)) | |
519 | return RX_CONTINUE; | |
520 | ||
521 | return RX_DROP_MONITOR; | |
522 | ||
523 | } | |
524 | ||
525 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
526 | ||
527 | if (ieee80211_is_data(hdr->frame_control) && | |
528 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 529 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 530 | return RX_DROP_MONITOR; |
902acc78 | 531 | #undef msh_h_get |
d6d1a5a7 | 532 | |
902acc78 JB |
533 | return RX_CONTINUE; |
534 | } | |
33b64eb2 LCC |
535 | |
536 | ||
49461622 | 537 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 538 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 539 | { |
a7767f95 | 540 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
541 | |
542 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
543 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 544 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 545 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 546 | hdr->seq_ctrl)) { |
5cf121c3 | 547 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
548 | rx->local->dot11FrameDuplicateCount++; |
549 | rx->sta->num_duplicates++; | |
550 | } | |
e4c26add | 551 | return RX_DROP_MONITOR; |
571ecf67 | 552 | } else |
5cf121c3 | 553 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
554 | } |
555 | ||
571ecf67 JB |
556 | if (unlikely(rx->skb->len < 16)) { |
557 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 558 | return RX_DROP_MONITOR; |
571ecf67 JB |
559 | } |
560 | ||
571ecf67 JB |
561 | /* Drop disallowed frame classes based on STA auth/assoc state; |
562 | * IEEE 802.11, Chap 5.5. | |
563 | * | |
ccd7b362 JB |
564 | * mac80211 filters only based on association state, i.e. it drops |
565 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
566 | * deauth/disassoc frames when needed. In addition, hostapd is |
567 | * responsible for filtering on both auth and assoc states. | |
568 | */ | |
33b64eb2 | 569 | |
902acc78 | 570 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 571 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 572 | |
a7767f95 HH |
573 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
574 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 575 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 576 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
577 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
578 | !ieee80211_has_tods(hdr->frame_control) && | |
579 | ieee80211_is_data(hdr->frame_control)) || | |
580 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
581 | /* Drop IBSS frames and frames for other hosts |
582 | * silently. */ | |
e4c26add | 583 | return RX_DROP_MONITOR; |
571ecf67 JB |
584 | } |
585 | ||
e4c26add | 586 | return RX_DROP_MONITOR; |
571ecf67 JB |
587 | } |
588 | ||
9ae54c84 | 589 | return RX_CONTINUE; |
570bd537 JB |
590 | } |
591 | ||
592 | ||
49461622 | 593 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 594 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 595 | { |
a7767f95 | 596 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
597 | int keyidx; |
598 | int hdrlen; | |
e4c26add | 599 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 600 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 601 | int mmie_keyidx = -1; |
570bd537 | 602 | |
3017b80b JB |
603 | /* |
604 | * Key selection 101 | |
605 | * | |
3cfcf6ac | 606 | * There are four types of keys: |
3017b80b | 607 | * - GTK (group keys) |
3cfcf6ac | 608 | * - IGTK (group keys for management frames) |
3017b80b JB |
609 | * - PTK (pairwise keys) |
610 | * - STK (station-to-station pairwise keys) | |
611 | * | |
612 | * When selecting a key, we have to distinguish between multicast | |
613 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
614 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
615 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
616 | * unicast frames can also use key indices like GTKs. Hence, if we | |
617 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 618 | * |
8dc06a1c JB |
619 | * Note that in a regular BSS, multicast frames are sent by the |
620 | * AP only, associated stations unicast the frame to the AP first | |
621 | * which then multicasts it on their behalf. | |
622 | * | |
3017b80b JB |
623 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
624 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
625 | * The spec seems to expect that one negotiates the same key with |
626 | * every station but there's no such requirement; VLANs could be | |
627 | * possible. | |
3017b80b JB |
628 | */ |
629 | ||
3cfcf6ac JM |
630 | if (!ieee80211_has_protected(hdr->frame_control)) { |
631 | if (!ieee80211_is_mgmt(hdr->frame_control) || | |
632 | rx->sta == NULL || !test_sta_flags(rx->sta, WLAN_STA_MFP)) | |
633 | return RX_CONTINUE; | |
634 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
635 | if (mmie_keyidx < 0) | |
636 | return RX_CONTINUE; | |
637 | } | |
571ecf67 | 638 | |
3017b80b | 639 | /* |
1990af8d | 640 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
641 | * addressed to us nor a multicast frame. |
642 | */ | |
5cf121c3 | 643 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 644 | return RX_CONTINUE; |
3017b80b | 645 | |
d4e46a3d JB |
646 | if (rx->sta) |
647 | stakey = rcu_dereference(rx->sta->key); | |
648 | ||
649 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
650 | rx->key = stakey; | |
3cfcf6ac JM |
651 | } else if (mmie_keyidx >= 0) { |
652 | /* Broadcast/multicast robust management frame / BIP */ | |
653 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && | |
654 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
655 | return RX_CONTINUE; | |
656 | ||
657 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
658 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
659 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
660 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
571ecf67 | 661 | } else { |
3017b80b JB |
662 | /* |
663 | * The device doesn't give us the IV so we won't be | |
664 | * able to look up the key. That's ok though, we | |
665 | * don't need to decrypt the frame, we just won't | |
666 | * be able to keep statistics accurate. | |
667 | * Except for key threshold notifications, should | |
668 | * we somehow allow the driver to tell us which key | |
669 | * the hardware used if this flag is set? | |
670 | */ | |
5cf121c3 JB |
671 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
672 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 673 | return RX_CONTINUE; |
3017b80b | 674 | |
a7767f95 | 675 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
676 | |
677 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 678 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
679 | |
680 | /* | |
681 | * no need to call ieee80211_wep_get_keyidx, | |
682 | * it verifies a bunch of things we've done already | |
683 | */ | |
684 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
685 | ||
d4e46a3d | 686 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
687 | |
688 | /* | |
689 | * RSNA-protected unicast frames should always be sent with | |
690 | * pairwise or station-to-station keys, but for WEP we allow | |
691 | * using a key index as well. | |
692 | */ | |
8f20fc24 | 693 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
694 | !is_multicast_ether_addr(hdr->addr1)) |
695 | rx->key = NULL; | |
571ecf67 JB |
696 | } |
697 | ||
3017b80b | 698 | if (rx->key) { |
571ecf67 | 699 | rx->key->tx_rx_count++; |
011bfcc4 | 700 | /* TODO: add threshold stuff again */ |
1990af8d | 701 | } else { |
e4c26add | 702 | return RX_DROP_MONITOR; |
70f08765 JB |
703 | } |
704 | ||
1990af8d JB |
705 | /* Check for weak IVs if possible */ |
706 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 707 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
708 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
709 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
710 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
711 | rx->sta->wep_weak_iv_count++; | |
712 | ||
70f08765 JB |
713 | switch (rx->key->conf.alg) { |
714 | case ALG_WEP: | |
e2f036da MN |
715 | result = ieee80211_crypto_wep_decrypt(rx); |
716 | break; | |
70f08765 | 717 | case ALG_TKIP: |
e2f036da MN |
718 | result = ieee80211_crypto_tkip_decrypt(rx); |
719 | break; | |
70f08765 | 720 | case ALG_CCMP: |
e2f036da MN |
721 | result = ieee80211_crypto_ccmp_decrypt(rx); |
722 | break; | |
3cfcf6ac JM |
723 | case ALG_AES_CMAC: |
724 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
725 | break; | |
70f08765 JB |
726 | } |
727 | ||
e2f036da | 728 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 729 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
730 | |
731 | return result; | |
70f08765 JB |
732 | } |
733 | ||
572e0012 KV |
734 | static ieee80211_rx_result debug_noinline |
735 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
736 | { | |
737 | struct ieee80211_local *local; | |
738 | struct ieee80211_hdr *hdr; | |
739 | struct sk_buff *skb; | |
740 | ||
741 | local = rx->local; | |
742 | skb = rx->skb; | |
743 | hdr = (struct ieee80211_hdr *) skb->data; | |
744 | ||
745 | if (!local->pspolling) | |
746 | return RX_CONTINUE; | |
747 | ||
748 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
749 | /* this is not from AP */ | |
750 | return RX_CONTINUE; | |
751 | ||
752 | if (!ieee80211_is_data(hdr->frame_control)) | |
753 | return RX_CONTINUE; | |
754 | ||
755 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
756 | /* AP has no more frames buffered for us */ | |
757 | local->pspolling = false; | |
758 | return RX_CONTINUE; | |
759 | } | |
760 | ||
761 | /* more data bit is set, let's request a new frame from the AP */ | |
762 | ieee80211_send_pspoll(local, rx->sdata); | |
763 | ||
764 | return RX_CONTINUE; | |
765 | } | |
766 | ||
133b8226 | 767 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 768 | { |
133b8226 | 769 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 770 | struct ieee80211_local *local = sdata->local; |
0795af57 | 771 | |
3e122be0 | 772 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 773 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
89fad578 CL |
774 | if (local->ops->sta_notify) |
775 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
776 | STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 777 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
778 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
779 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
780 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
781 | } | |
782 | ||
133b8226 | 783 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 784 | { |
133b8226 JB |
785 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
786 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
787 | struct sk_buff *skb; |
788 | int sent = 0; | |
571ecf67 | 789 | |
3e122be0 | 790 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 791 | |
07346f81 | 792 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
89fad578 CL |
793 | if (local->ops->sta_notify) |
794 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
795 | STA_NOTIFY_AWAKE, &sta->sta); | |
004c872e JB |
796 | |
797 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
798 | sta_info_clear_tim_bit(sta); | |
799 | ||
571ecf67 | 800 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
801 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
802 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 803 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 804 | |
571ecf67 JB |
805 | /* Send all buffered frames to the station */ |
806 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 807 | sent++; |
8b30b1fe | 808 | skb->requeue = 1; |
571ecf67 JB |
809 | dev_queue_xmit(skb); |
810 | } | |
811 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
812 | local->total_ps_buffered--; |
813 | sent++; | |
814 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 815 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 816 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 817 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 818 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 819 | skb->requeue = 1; |
571ecf67 JB |
820 | dev_queue_xmit(skb); |
821 | } | |
822 | ||
823 | return sent; | |
824 | } | |
825 | ||
49461622 | 826 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 827 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
828 | { |
829 | struct sta_info *sta = rx->sta; | |
a7767f95 | 830 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
831 | |
832 | if (!sta) | |
9ae54c84 | 833 | return RX_CONTINUE; |
571ecf67 JB |
834 | |
835 | /* Update last_rx only for IBSS packets which are for the current | |
836 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
837 | * other STAs are using different BSSID. */ | |
05c914fe | 838 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 839 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 840 | NL80211_IFTYPE_ADHOC); |
46900298 | 841 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 JB |
842 | sta->last_rx = jiffies; |
843 | } else | |
844 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 845 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
846 | /* Update last_rx only for unicast frames in order to prevent |
847 | * the Probe Request frames (the only broadcast frames from a | |
848 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
849 | * Mesh beacons will update last_rx when if they are found to |
850 | * match the current local configuration when processed. | |
571ecf67 JB |
851 | */ |
852 | sta->last_rx = jiffies; | |
853 | } | |
854 | ||
5cf121c3 | 855 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 856 | return RX_CONTINUE; |
571ecf67 JB |
857 | |
858 | sta->rx_fragments++; | |
859 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 860 | sta->last_signal = rx->status->signal; |
566bfe5a | 861 | sta->last_qual = rx->status->qual; |
5cf121c3 | 862 | sta->last_noise = rx->status->noise; |
571ecf67 | 863 | |
72eaa43a JB |
864 | /* |
865 | * Change STA power saving mode only at the end of a frame | |
866 | * exchange sequence. | |
867 | */ | |
3e122be0 | 868 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
869 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
870 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
871 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
872 | /* | |
873 | * Ignore doze->wake transitions that are | |
874 | * indicated by non-data frames, the standard | |
875 | * is unclear here, but for example going to | |
876 | * PS mode and then scanning would cause a | |
877 | * doze->wake transition for the probe request, | |
878 | * and that is clearly undesirable. | |
879 | */ | |
880 | if (ieee80211_is_data(hdr->frame_control) && | |
881 | !ieee80211_has_pm(hdr->frame_control)) | |
882 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
883 | } else { | |
884 | if (ieee80211_has_pm(hdr->frame_control)) | |
885 | ap_sta_ps_start(sta); | |
886 | } | |
571ecf67 JB |
887 | } |
888 | ||
889 | /* Drop data::nullfunc frames silently, since they are used only to | |
890 | * control station power saving mode. */ | |
a7767f95 | 891 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
892 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
893 | /* Update counter and free packet here to avoid counting this | |
894 | * as a dropped packed. */ | |
895 | sta->rx_packets++; | |
896 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 897 | return RX_QUEUED; |
571ecf67 JB |
898 | } |
899 | ||
9ae54c84 | 900 | return RX_CONTINUE; |
571ecf67 JB |
901 | } /* ieee80211_rx_h_sta_process */ |
902 | ||
571ecf67 JB |
903 | static inline struct ieee80211_fragment_entry * |
904 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
905 | unsigned int frag, unsigned int seq, int rx_queue, | |
906 | struct sk_buff **skb) | |
907 | { | |
908 | struct ieee80211_fragment_entry *entry; | |
909 | int idx; | |
910 | ||
911 | idx = sdata->fragment_next; | |
912 | entry = &sdata->fragments[sdata->fragment_next++]; | |
913 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
914 | sdata->fragment_next = 0; | |
915 | ||
916 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 917 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
918 | struct ieee80211_hdr *hdr = |
919 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
920 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
921 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 922 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
923 | sdata->dev->name, idx, |
924 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 925 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 926 | #endif |
571ecf67 JB |
927 | __skb_queue_purge(&entry->skb_list); |
928 | } | |
929 | ||
930 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
931 | *skb = NULL; | |
932 | entry->first_frag_time = jiffies; | |
933 | entry->seq = seq; | |
934 | entry->rx_queue = rx_queue; | |
935 | entry->last_frag = frag; | |
936 | entry->ccmp = 0; | |
937 | entry->extra_len = 0; | |
938 | ||
939 | return entry; | |
940 | } | |
941 | ||
942 | static inline struct ieee80211_fragment_entry * | |
943 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 944 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
945 | int rx_queue, struct ieee80211_hdr *hdr) |
946 | { | |
947 | struct ieee80211_fragment_entry *entry; | |
948 | int i, idx; | |
949 | ||
950 | idx = sdata->fragment_next; | |
951 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
952 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
953 | |
954 | idx--; | |
955 | if (idx < 0) | |
956 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
957 | ||
958 | entry = &sdata->fragments[idx]; | |
959 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
960 | entry->rx_queue != rx_queue || | |
961 | entry->last_frag + 1 != frag) | |
962 | continue; | |
963 | ||
b73d70ad | 964 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 965 | |
b73d70ad HH |
966 | /* |
967 | * Check ftype and addresses are equal, else check next fragment | |
968 | */ | |
969 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
970 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
971 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
972 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
973 | continue; | |
974 | ||
ab46623e | 975 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
976 | __skb_queue_purge(&entry->skb_list); |
977 | continue; | |
978 | } | |
979 | return entry; | |
980 | } | |
981 | ||
982 | return NULL; | |
983 | } | |
984 | ||
49461622 | 985 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 986 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
987 | { |
988 | struct ieee80211_hdr *hdr; | |
989 | u16 sc; | |
358c8d9d | 990 | __le16 fc; |
571ecf67 JB |
991 | unsigned int frag, seq; |
992 | struct ieee80211_fragment_entry *entry; | |
993 | struct sk_buff *skb; | |
994 | ||
b73d70ad | 995 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 996 | fc = hdr->frame_control; |
571ecf67 JB |
997 | sc = le16_to_cpu(hdr->seq_ctrl); |
998 | frag = sc & IEEE80211_SCTL_FRAG; | |
999 | ||
358c8d9d | 1000 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1001 | (rx->skb)->len < 24 || |
1002 | is_multicast_ether_addr(hdr->addr1))) { | |
1003 | /* not fragmented */ | |
1004 | goto out; | |
1005 | } | |
1006 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1007 | ||
1008 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1009 | ||
1010 | if (frag == 0) { | |
1011 | /* This is the first fragment of a new frame. */ | |
1012 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1013 | rx->queue, &(rx->skb)); |
8f20fc24 | 1014 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1015 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1016 | /* Store CCMP PN so that we can verify that the next |
1017 | * fragment has a sequential PN value. */ | |
1018 | entry->ccmp = 1; | |
1019 | memcpy(entry->last_pn, | |
5cf121c3 | 1020 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1021 | CCMP_PN_LEN); |
1022 | } | |
9ae54c84 | 1023 | return RX_QUEUED; |
571ecf67 JB |
1024 | } |
1025 | ||
1026 | /* This is a fragment for a frame that should already be pending in | |
1027 | * fragment cache. Add this fragment to the end of the pending entry. | |
1028 | */ | |
b73d70ad | 1029 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1030 | if (!entry) { |
1031 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1032 | return RX_DROP_MONITOR; |
571ecf67 JB |
1033 | } |
1034 | ||
1035 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1036 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1037 | if (entry->ccmp) { | |
1038 | int i; | |
1039 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1040 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1041 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1042 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1043 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1044 | pn[i]++; | |
1045 | if (pn[i]) | |
1046 | break; | |
1047 | } | |
5cf121c3 | 1048 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1049 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1050 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1051 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1052 | } | |
1053 | ||
358c8d9d | 1054 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1055 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1056 | entry->last_frag = frag; | |
1057 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1058 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1059 | rx->skb = NULL; |
9ae54c84 | 1060 | return RX_QUEUED; |
571ecf67 JB |
1061 | } |
1062 | ||
1063 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1064 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1065 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1066 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1067 | GFP_ATOMIC))) { | |
1068 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1069 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1070 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1071 | } |
1072 | } | |
1073 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1074 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1075 | dev_kfree_skb(skb); | |
1076 | } | |
1077 | ||
1078 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1079 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1080 | |
1081 | out: | |
1082 | if (rx->sta) | |
1083 | rx->sta->rx_packets++; | |
1084 | if (is_multicast_ether_addr(hdr->addr1)) | |
1085 | rx->local->dot11MulticastReceivedFrameCount++; | |
1086 | else | |
1087 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1088 | return RX_CONTINUE; |
571ecf67 JB |
1089 | } |
1090 | ||
49461622 | 1091 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1092 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1093 | { |
98f0b0a3 | 1094 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1095 | struct sk_buff *skb; |
1096 | int no_pending_pkts; | |
358c8d9d | 1097 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1098 | |
358c8d9d | 1099 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1100 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1101 | return RX_CONTINUE; |
571ecf67 | 1102 | |
05c914fe JB |
1103 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1104 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1105 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1106 | |
571ecf67 JB |
1107 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1108 | if (!skb) { | |
1109 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1110 | if (skb) | |
1111 | rx->local->total_ps_buffered--; | |
1112 | } | |
1113 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1114 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1115 | ||
1116 | if (skb) { | |
1117 | struct ieee80211_hdr *hdr = | |
1118 | (struct ieee80211_hdr *) skb->data; | |
1119 | ||
4a9a66e9 JB |
1120 | /* |
1121 | * Tell TX path to send one frame even though the STA may | |
1122 | * still remain is PS mode after this frame exchange. | |
1123 | */ | |
07346f81 | 1124 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1125 | |
1126 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1127 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1128 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1129 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1130 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1131 | ||
1132 | /* Use MoreData flag to indicate whether there are more | |
1133 | * buffered frames for this STA */ | |
836341a7 | 1134 | if (no_pending_pkts) |
571ecf67 | 1135 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1136 | else |
571ecf67 JB |
1137 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1138 | ||
1139 | dev_queue_xmit(skb); | |
1140 | ||
004c872e JB |
1141 | if (no_pending_pkts) |
1142 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1143 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1144 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1145 | /* |
1146 | * FIXME: This can be the result of a race condition between | |
1147 | * us expiring a frame and the station polling for it. | |
1148 | * Should we send it a null-func frame indicating we | |
1149 | * have nothing buffered for it? | |
1150 | */ | |
0c68ae26 | 1151 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1152 | "though there are no buffered frames for it\n", |
0c68ae26 | 1153 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1154 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1155 | } |
1156 | ||
9ae54c84 | 1157 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1158 | * count as an dropped frame. */ |
1159 | dev_kfree_skb(rx->skb); | |
1160 | ||
9ae54c84 | 1161 | return RX_QUEUED; |
571ecf67 JB |
1162 | } |
1163 | ||
49461622 | 1164 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1165 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1166 | { |
6e0d114d | 1167 | u8 *data = rx->skb->data; |
238f74a2 | 1168 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1169 | |
238f74a2 | 1170 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1171 | return RX_CONTINUE; |
6e0d114d JB |
1172 | |
1173 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1174 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1175 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1176 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1177 | /* change frame type to non QOS */ |
238f74a2 | 1178 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1179 | |
9ae54c84 | 1180 | return RX_CONTINUE; |
6e0d114d JB |
1181 | } |
1182 | ||
76ee65bf | 1183 | static int |
5cf121c3 | 1184 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1185 | { |
07346f81 | 1186 | if (unlikely(!rx->sta || |
f4ea83dd | 1187 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1188 | return -EACCES; |
571ecf67 | 1189 | |
76ee65bf | 1190 | return 0; |
571ecf67 JB |
1191 | } |
1192 | ||
76ee65bf | 1193 | static int |
358c8d9d | 1194 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1195 | { |
3017b80b | 1196 | /* |
7848ba7d JB |
1197 | * Pass through unencrypted frames if the hardware has |
1198 | * decrypted them already. | |
3017b80b | 1199 | */ |
5cf121c3 | 1200 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1201 | return 0; |
571ecf67 JB |
1202 | |
1203 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1204 | if (unlikely(!ieee80211_has_protected(fc) && |
1205 | !ieee80211_is_nullfunc(fc) && | |
3cfcf6ac JM |
1206 | (!ieee80211_is_mgmt(fc) || |
1207 | (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1208 | rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) && | |
1209 | (rx->key || rx->sdata->drop_unencrypted))) | |
1210 | return -EACCES; | |
1211 | /* BIP does not use Protected field, so need to check MMIE */ | |
1212 | if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) && | |
1213 | ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && | |
1214 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
b3fc9c6c | 1215 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1216 | return -EACCES; |
b3fc9c6c | 1217 | |
76ee65bf | 1218 | return 0; |
571ecf67 JB |
1219 | } |
1220 | ||
76ee65bf | 1221 | static int |
5cf121c3 | 1222 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1223 | { |
1224 | struct net_device *dev = rx->dev; | |
571ecf67 | 1225 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1226 | u16 hdrlen, ethertype; |
571ecf67 JB |
1227 | u8 *payload; |
1228 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1229 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1230 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1231 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1232 | ||
b73d70ad | 1233 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1234 | return -1; |
571ecf67 | 1235 | |
b73d70ad | 1236 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1237 | |
1238 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1239 | * header | |
1240 | * IEEE 802.11 address fields: | |
1241 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1242 | * 0 0 DA SA BSSID n/a | |
1243 | * 0 1 DA BSSID SA n/a | |
1244 | * 1 0 BSSID SA DA n/a | |
1245 | * 1 1 RA TA DA SA | |
1246 | */ | |
b73d70ad HH |
1247 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1248 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1249 | |
b73d70ad HH |
1250 | switch (hdr->frame_control & |
1251 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
c1b4aa3f | 1252 | case cpu_to_le16(IEEE80211_FCTL_TODS): |
05c914fe JB |
1253 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1254 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1255 | return -1; |
571ecf67 | 1256 | break; |
c1b4aa3f | 1257 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1258 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1259 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1260 | return -1; |
79617dee Y |
1261 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1262 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1263 | (skb->data + hdrlen); | |
1264 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1265 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1266 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1267 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1268 | } | |
1269 | } | |
571ecf67 | 1270 | break; |
c1b4aa3f | 1271 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1272 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1273 | (is_multicast_ether_addr(dst) && |
1274 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1275 | return -1; |
571ecf67 | 1276 | break; |
c1b4aa3f | 1277 | case cpu_to_le16(0): |
05c914fe | 1278 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1279 | return -1; |
571ecf67 JB |
1280 | break; |
1281 | } | |
1282 | ||
f4ea83dd | 1283 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1284 | return -1; |
571ecf67 | 1285 | |
76ee65bf | 1286 | payload = skb->data + hdrlen; |
571ecf67 JB |
1287 | ethertype = (payload[6] << 8) | payload[7]; |
1288 | ||
1289 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1290 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1291 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1292 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1293 | * replace EtherType */ | |
1294 | skb_pull(skb, hdrlen + 6); | |
1295 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1296 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1297 | } else { | |
1298 | struct ethhdr *ehdr; | |
1299 | __be16 len; | |
ce3edf6d | 1300 | |
571ecf67 JB |
1301 | skb_pull(skb, hdrlen); |
1302 | len = htons(skb->len); | |
1303 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1304 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1305 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1306 | ehdr->h_proto = len; | |
1307 | } | |
76ee65bf RR |
1308 | return 0; |
1309 | } | |
571ecf67 | 1310 | |
ce3edf6d JB |
1311 | /* |
1312 | * requires that rx->skb is a frame with ethernet header | |
1313 | */ | |
358c8d9d | 1314 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1315 | { |
c97c23e3 | 1316 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1317 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1318 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1319 | ||
1320 | /* | |
1321 | * Allow EAPOL frames to us/the PAE group address regardless | |
1322 | * of whether the frame was encrypted or not. | |
1323 | */ | |
1324 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1325 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1326 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1327 | return true; | |
1328 | ||
1329 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1330 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1331 | return false; |
1332 | ||
1333 | return true; | |
1334 | } | |
1335 | ||
1336 | /* | |
1337 | * requires that rx->skb is a frame with ethernet header | |
1338 | */ | |
76ee65bf | 1339 | static void |
5cf121c3 | 1340 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1341 | { |
1342 | struct net_device *dev = rx->dev; | |
1343 | struct ieee80211_local *local = rx->local; | |
1344 | struct sk_buff *skb, *xmit_skb; | |
1345 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1346 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1347 | struct sta_info *dsta; | |
571ecf67 | 1348 | |
76ee65bf RR |
1349 | skb = rx->skb; |
1350 | xmit_skb = NULL; | |
571ecf67 | 1351 | |
05c914fe JB |
1352 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1353 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1354 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1355 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1356 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1357 | /* | |
1358 | * send multicast frames both to higher layers in | |
1359 | * local net stack and back to the wireless medium | |
1360 | */ | |
76ee65bf RR |
1361 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1362 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1363 | printk(KERN_DEBUG "%s: failed to clone " |
1364 | "multicast frame\n", dev->name); | |
1365 | } else { | |
571ecf67 | 1366 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1367 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1368 | /* |
1369 | * The destination station is associated to | |
1370 | * this AP (in this VLAN), so send the frame | |
1371 | * directly to it and do not pass it to local | |
1372 | * net stack. | |
571ecf67 | 1373 | */ |
76ee65bf | 1374 | xmit_skb = skb; |
571ecf67 JB |
1375 | skb = NULL; |
1376 | } | |
571ecf67 JB |
1377 | } |
1378 | } | |
1379 | ||
1380 | if (skb) { | |
d1c3a37c JB |
1381 | int align __maybe_unused; |
1382 | ||
1383 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1384 | /* | |
1385 | * 'align' will only take the values 0 or 2 here | |
1386 | * since all frames are required to be aligned | |
1387 | * to 2-byte boundaries when being passed to | |
1388 | * mac80211. That also explains the __skb_push() | |
1389 | * below. | |
1390 | */ | |
1391 | align = (unsigned long)skb->data & 4; | |
1392 | if (align) { | |
1393 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1394 | dev_kfree_skb(skb); | |
1395 | skb = NULL; | |
1396 | } else { | |
1397 | u8 *data = skb->data; | |
1398 | size_t len = skb->len; | |
1399 | u8 *new = __skb_push(skb, align); | |
1400 | memmove(new, data, len); | |
1401 | __skb_trim(skb, len); | |
1402 | } | |
1403 | } | |
1404 | #endif | |
1405 | ||
1406 | if (skb) { | |
1407 | /* deliver to local stack */ | |
1408 | skb->protocol = eth_type_trans(skb, dev); | |
1409 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1410 | netif_rx(skb); | |
1411 | } | |
571ecf67 JB |
1412 | } |
1413 | ||
76ee65bf | 1414 | if (xmit_skb) { |
571ecf67 | 1415 | /* send to wireless media */ |
f831e909 | 1416 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1417 | skb_reset_network_header(xmit_skb); |
1418 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1419 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1420 | } |
76ee65bf RR |
1421 | } |
1422 | ||
49461622 | 1423 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1424 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1425 | { |
1426 | struct net_device *dev = rx->dev; | |
1427 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1428 | u16 ethertype; |
fd4c7f2f RR |
1429 | u8 *payload; |
1430 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1431 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1432 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1433 | const struct ethhdr *eth; |
1434 | int remaining, err; | |
1435 | u8 dst[ETH_ALEN]; | |
1436 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1437 | |
358c8d9d | 1438 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1439 | return RX_CONTINUE; |
fd4c7f2f | 1440 | |
358c8d9d | 1441 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1442 | return RX_DROP_MONITOR; |
fd4c7f2f | 1443 | |
5cf121c3 | 1444 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1445 | return RX_CONTINUE; |
fd4c7f2f RR |
1446 | |
1447 | err = ieee80211_data_to_8023(rx); | |
1448 | if (unlikely(err)) | |
e4c26add | 1449 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1450 | |
1451 | skb->dev = dev; | |
1452 | ||
1453 | dev->stats.rx_packets++; | |
1454 | dev->stats.rx_bytes += skb->len; | |
1455 | ||
1456 | /* skip the wrapping header */ | |
1457 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1458 | if (!eth) | |
e4c26add | 1459 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1460 | |
1461 | while (skb != frame) { | |
1462 | u8 padding; | |
1463 | __be16 len = eth->h_proto; | |
1464 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1465 | ||
1466 | remaining = skb->len; | |
1467 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1468 | memcpy(src, eth->h_source, ETH_ALEN); | |
1469 | ||
1470 | padding = ((4 - subframe_len) & 0x3); | |
1471 | /* the last MSDU has no padding */ | |
f4ea83dd | 1472 | if (subframe_len > remaining) |
e4c26add | 1473 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1474 | |
1475 | skb_pull(skb, sizeof(struct ethhdr)); | |
1476 | /* if last subframe reuse skb */ | |
1477 | if (remaining <= subframe_len + padding) | |
1478 | frame = skb; | |
1479 | else { | |
d1c3a37c JB |
1480 | /* |
1481 | * Allocate and reserve two bytes more for payload | |
1482 | * alignment since sizeof(struct ethhdr) is 14. | |
1483 | */ | |
1484 | frame = dev_alloc_skb( | |
1485 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1486 | subframe_len + 2); | |
fd4c7f2f RR |
1487 | |
1488 | if (frame == NULL) | |
e4c26add | 1489 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1490 | |
d1c3a37c JB |
1491 | skb_reserve(frame, |
1492 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1493 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1494 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1495 | ntohs(len)); | |
1496 | ||
1497 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1498 | padding); | |
1499 | if (!eth) { | |
fd4c7f2f | 1500 | dev_kfree_skb(frame); |
e4c26add | 1501 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1502 | } |
1503 | } | |
1504 | ||
ce3edf6d | 1505 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1506 | frame->dev = dev; |
1507 | frame->priority = skb->priority; | |
1508 | rx->skb = frame; | |
1509 | ||
fd4c7f2f RR |
1510 | payload = frame->data; |
1511 | ethertype = (payload[6] << 8) | payload[7]; | |
1512 | ||
1513 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1514 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1515 | compare_ether_addr(payload, | |
1516 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1517 | /* remove RFC1042 or Bridge-Tunnel |
1518 | * encapsulation and replace EtherType */ | |
1519 | skb_pull(frame, 6); | |
1520 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1521 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1522 | } else { | |
ce3edf6d JB |
1523 | memcpy(skb_push(frame, sizeof(__be16)), |
1524 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1525 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1526 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1527 | } | |
1528 | ||
358c8d9d | 1529 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1530 | if (skb == frame) /* last frame */ |
e4c26add | 1531 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1532 | dev_kfree_skb(frame); |
1533 | continue; | |
1534 | } | |
fd4c7f2f RR |
1535 | |
1536 | ieee80211_deliver_skb(rx); | |
1537 | } | |
1538 | ||
9ae54c84 | 1539 | return RX_QUEUED; |
fd4c7f2f RR |
1540 | } |
1541 | ||
bf94e17b | 1542 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1543 | static ieee80211_rx_result |
e32f85f7 LCC |
1544 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1545 | { | |
1546 | struct ieee80211_hdr *hdr; | |
1547 | struct ieee80211s_hdr *mesh_hdr; | |
1548 | unsigned int hdrlen; | |
1549 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1550 | ||
1551 | hdr = (struct ieee80211_hdr *) skb->data; | |
1552 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1553 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1554 | ||
1555 | if (!ieee80211_is_data(hdr->frame_control)) | |
1556 | return RX_CONTINUE; | |
1557 | ||
1558 | if (!mesh_hdr->ttl) | |
1559 | /* illegal frame */ | |
1560 | return RX_DROP_MONITOR; | |
1561 | ||
79617dee Y |
1562 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1563 | struct ieee80211_sub_if_data *sdata; | |
1564 | struct mesh_path *mppath; | |
1565 | ||
1566 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1567 | rcu_read_lock(); | |
1568 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1569 | if (!mppath) { | |
1570 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1571 | } else { | |
1572 | spin_lock_bh(&mppath->state_lock); | |
1573 | mppath->exp_time = jiffies; | |
1574 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1575 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1576 | spin_unlock_bh(&mppath->state_lock); | |
1577 | } | |
1578 | rcu_read_unlock(); | |
1579 | } | |
1580 | ||
e32f85f7 LCC |
1581 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1582 | return RX_CONTINUE; | |
1583 | ||
1584 | mesh_hdr->ttl--; | |
1585 | ||
1586 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1587 | if (!mesh_hdr->ttl) | |
472dbc45 | 1588 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1589 | dropped_frames_ttl); |
1590 | else { | |
1591 | struct ieee80211_hdr *fwd_hdr; | |
1592 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1593 | ||
1594 | if (!fwd_skb && net_ratelimit()) | |
1595 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1596 | rx->dev->name); | |
1597 | ||
1598 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1599 | /* | |
1600 | * Save TA to addr1 to send TA a path error if a | |
1601 | * suitable next hop is not found | |
1602 | */ | |
1603 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1604 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1605 | fwd_skb->dev = rx->local->mdev; | |
1606 | fwd_skb->iif = rx->dev->ifindex; | |
1607 | dev_queue_xmit(fwd_skb); | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | if (is_multicast_ether_addr(hdr->addr3) || | |
1612 | rx->dev->flags & IFF_PROMISC) | |
1613 | return RX_CONTINUE; | |
1614 | else | |
1615 | return RX_DROP_MONITOR; | |
1616 | } | |
bf94e17b | 1617 | #endif |
e32f85f7 | 1618 | |
49461622 | 1619 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1620 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1621 | { |
1622 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1623 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1624 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1625 | int err; |
76ee65bf | 1626 | |
358c8d9d | 1627 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1628 | return RX_CONTINUE; |
76ee65bf | 1629 | |
358c8d9d | 1630 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1631 | return RX_DROP_MONITOR; |
76ee65bf | 1632 | |
76ee65bf RR |
1633 | err = ieee80211_data_to_8023(rx); |
1634 | if (unlikely(err)) | |
e4c26add | 1635 | return RX_DROP_UNUSABLE; |
76ee65bf | 1636 | |
358c8d9d | 1637 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1638 | return RX_DROP_MONITOR; |
ce3edf6d | 1639 | |
76ee65bf RR |
1640 | rx->skb->dev = dev; |
1641 | ||
1642 | dev->stats.rx_packets++; | |
1643 | dev->stats.rx_bytes += rx->skb->len; | |
1644 | ||
1645 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1646 | |
9ae54c84 | 1647 | return RX_QUEUED; |
571ecf67 JB |
1648 | } |
1649 | ||
49461622 | 1650 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1651 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1652 | { |
1653 | struct ieee80211_local *local = rx->local; | |
1654 | struct ieee80211_hw *hw = &local->hw; | |
1655 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1656 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1657 | struct tid_ampdu_rx *tid_agg_rx; |
1658 | u16 start_seq_num; | |
1659 | u16 tid; | |
1660 | ||
a7767f95 | 1661 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1662 | return RX_CONTINUE; |
71364716 | 1663 | |
a7767f95 | 1664 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1665 | if (!rx->sta) |
9ae54c84 | 1666 | return RX_CONTINUE; |
71364716 | 1667 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1668 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1669 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1670 | return RX_CONTINUE; |
cee24a3e | 1671 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1672 | |
1673 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1674 | ||
1675 | /* reset session timer */ | |
20ad19d0 JB |
1676 | if (tid_agg_rx->timeout) |
1677 | mod_timer(&tid_agg_rx->session_timer, | |
1678 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1679 | |
1680 | /* manage reordering buffer according to requested */ | |
1681 | /* sequence number */ | |
1682 | rcu_read_lock(); | |
1683 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1684 | start_seq_num, 1); | |
1685 | rcu_read_unlock(); | |
e4c26add | 1686 | return RX_DROP_UNUSABLE; |
71364716 RR |
1687 | } |
1688 | ||
9ae54c84 | 1689 | return RX_CONTINUE; |
71364716 RR |
1690 | } |
1691 | ||
f4f727a6 JM |
1692 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1693 | struct ieee80211_mgmt *mgmt, | |
1694 | size_t len) | |
fea14732 JM |
1695 | { |
1696 | struct ieee80211_local *local = sdata->local; | |
1697 | struct sk_buff *skb; | |
1698 | struct ieee80211_mgmt *resp; | |
1699 | ||
1700 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1701 | /* Not to own unicast address */ | |
1702 | return; | |
1703 | } | |
1704 | ||
46900298 JB |
1705 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1706 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
fea14732 JM |
1707 | /* Not from the current AP. */ |
1708 | return; | |
1709 | } | |
1710 | ||
46900298 | 1711 | if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) { |
fea14732 JM |
1712 | /* Association in progress; ignore SA Query */ |
1713 | return; | |
1714 | } | |
1715 | ||
1716 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1717 | /* Too short SA Query request frame */ | |
1718 | return; | |
1719 | } | |
1720 | ||
1721 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1722 | if (skb == NULL) | |
1723 | return; | |
1724 | ||
1725 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1726 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1727 | memset(resp, 0, 24); | |
1728 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1729 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1730 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1731 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1732 | IEEE80211_STYPE_ACTION); | |
1733 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1734 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1735 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1736 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1737 | mgmt->u.action.u.sa_query.trans_id, | |
1738 | WLAN_SA_QUERY_TR_ID_LEN); | |
1739 | ||
1740 | ieee80211_tx_skb(sdata, skb, 1); | |
1741 | } | |
1742 | ||
de1ede7a JB |
1743 | static ieee80211_rx_result debug_noinline |
1744 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1745 | { | |
1746 | struct ieee80211_local *local = rx->local; | |
1747 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1748 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
c481ec97 | 1749 | struct ieee80211_bss *bss; |
de1ede7a JB |
1750 | int len = rx->skb->len; |
1751 | ||
1752 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1753 | return RX_CONTINUE; | |
1754 | ||
1755 | if (!rx->sta) | |
1756 | return RX_DROP_MONITOR; | |
1757 | ||
1758 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1759 | return RX_DROP_MONITOR; | |
1760 | ||
97ebe12a JM |
1761 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1762 | return RX_DROP_MONITOR; | |
1763 | ||
de1ede7a JB |
1764 | /* all categories we currently handle have action_code */ |
1765 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1766 | return RX_DROP_MONITOR; | |
1767 | ||
de1ede7a JB |
1768 | switch (mgmt->u.action.category) { |
1769 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1770 | /* |
1771 | * The aggregation code is not prepared to handle | |
1772 | * anything but STA/AP due to the BSSID handling; | |
1773 | * IBSS could work in the code but isn't supported | |
1774 | * by drivers or the standard. | |
1775 | */ | |
1776 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1777 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1778 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1779 | return RX_DROP_MONITOR; | |
1780 | ||
de1ede7a JB |
1781 | switch (mgmt->u.action.u.addba_req.action_code) { |
1782 | case WLAN_ACTION_ADDBA_REQ: | |
1783 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1784 | sizeof(mgmt->u.action.u.addba_req))) | |
1785 | return RX_DROP_MONITOR; | |
1786 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1787 | break; | |
1788 | case WLAN_ACTION_ADDBA_RESP: | |
1789 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1790 | sizeof(mgmt->u.action.u.addba_resp))) | |
1791 | return RX_DROP_MONITOR; | |
1792 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1793 | break; | |
1794 | case WLAN_ACTION_DELBA: | |
1795 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1796 | sizeof(mgmt->u.action.u.delba))) | |
1797 | return RX_DROP_MONITOR; | |
1798 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1799 | break; | |
1800 | } | |
39192c0b JB |
1801 | break; |
1802 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1803 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1804 | return RX_DROP_MONITOR; | |
46900298 JB |
1805 | |
1806 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1807 | return RX_DROP_MONITOR; | |
1808 | ||
39192c0b JB |
1809 | switch (mgmt->u.action.u.measurement.action_code) { |
1810 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1811 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1812 | sizeof(mgmt->u.action.u.measurement))) | |
1813 | return RX_DROP_MONITOR; | |
1814 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1815 | break; | |
c481ec97 S |
1816 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1817 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1818 | sizeof(mgmt->u.action.u.chan_switch))) | |
1819 | return RX_DROP_MONITOR; | |
1820 | ||
46900298 | 1821 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1822 | return RX_DROP_MONITOR; |
1823 | ||
46900298 | 1824 | bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid, |
c481ec97 | 1825 | local->hw.conf.channel->center_freq, |
46900298 JB |
1826 | sdata->u.mgd.ssid, |
1827 | sdata->u.mgd.ssid_len); | |
c481ec97 S |
1828 | if (!bss) |
1829 | return RX_DROP_MONITOR; | |
1830 | ||
1831 | ieee80211_process_chanswitch(sdata, | |
1832 | &mgmt->u.action.u.chan_switch.sw_elem, bss); | |
1833 | ieee80211_rx_bss_put(local, bss); | |
1834 | break; | |
39192c0b JB |
1835 | } |
1836 | break; | |
fea14732 JM |
1837 | case WLAN_CATEGORY_SA_QUERY: |
1838 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1839 | sizeof(mgmt->u.action.u.sa_query))) | |
1840 | return RX_DROP_MONITOR; | |
1841 | switch (mgmt->u.action.u.sa_query.action) { | |
1842 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1843 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1844 | return RX_DROP_MONITOR; | |
1845 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1846 | break; | |
1847 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1848 | /* | |
1849 | * SA Query response is currently only used in AP mode | |
1850 | * and it is processed in user space. | |
1851 | */ | |
1852 | return RX_CONTINUE; | |
1853 | } | |
1854 | break; | |
39192c0b JB |
1855 | default: |
1856 | return RX_CONTINUE; | |
de1ede7a JB |
1857 | } |
1858 | ||
39192c0b JB |
1859 | rx->sta->rx_packets++; |
1860 | dev_kfree_skb(rx->skb); | |
1861 | return RX_QUEUED; | |
de1ede7a JB |
1862 | } |
1863 | ||
49461622 | 1864 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1865 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1866 | { |
759ef3eb | 1867 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1868 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1869 | |
5cf121c3 | 1870 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1871 | return RX_DROP_MONITOR; |
571ecf67 | 1872 | |
97ebe12a JM |
1873 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1874 | return RX_DROP_MONITOR; | |
1875 | ||
472dbc45 JB |
1876 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1877 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1878 | ||
05c914fe JB |
1879 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
1880 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
759ef3eb JB |
1881 | return RX_DROP_MONITOR; |
1882 | ||
f9d540ee | 1883 | |
46900298 JB |
1884 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
1885 | if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME) | |
1886 | return RX_DROP_MONITOR; | |
1887 | return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); | |
1888 | } | |
1889 | ||
1890 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status); | |
571ecf67 JB |
1891 | } |
1892 | ||
571ecf67 JB |
1893 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1894 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1895 | struct ieee80211_rx_data *rx) |
571ecf67 | 1896 | { |
a7767f95 HH |
1897 | int keyidx; |
1898 | unsigned int hdrlen; | |
571ecf67 | 1899 | |
a7767f95 | 1900 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1901 | if (rx->skb->len >= hdrlen + 4) |
1902 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1903 | else | |
1904 | keyidx = -1; | |
1905 | ||
8944b79f | 1906 | if (!rx->sta) { |
aa0daf0e JB |
1907 | /* |
1908 | * Some hardware seem to generate incorrect Michael MIC | |
1909 | * reports; ignore them to avoid triggering countermeasures. | |
1910 | */ | |
571ecf67 JB |
1911 | goto ignore; |
1912 | } | |
1913 | ||
a7767f95 | 1914 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1915 | goto ignore; |
571ecf67 | 1916 | |
05c914fe | 1917 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1918 | /* |
1919 | * APs with pairwise keys should never receive Michael MIC | |
1920 | * errors for non-zero keyidx because these are reserved for | |
1921 | * group keys and only the AP is sending real multicast | |
1922 | * frames in the BSS. | |
1923 | */ | |
eb063c17 | 1924 | goto ignore; |
571ecf67 JB |
1925 | } |
1926 | ||
a7767f95 HH |
1927 | if (!ieee80211_is_data(hdr->frame_control) && |
1928 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1929 | goto ignore; |
571ecf67 | 1930 | |
f698d856 | 1931 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1932 | ignore: |
1933 | dev_kfree_skb(rx->skb); | |
1934 | rx->skb = NULL; | |
1935 | } | |
1936 | ||
5cf121c3 JB |
1937 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1938 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1939 | { |
1940 | struct ieee80211_sub_if_data *sdata; | |
1941 | struct ieee80211_local *local = rx->local; | |
1942 | struct ieee80211_rtap_hdr { | |
1943 | struct ieee80211_radiotap_header hdr; | |
1944 | u8 flags; | |
1945 | u8 rate; | |
1946 | __le16 chan_freq; | |
1947 | __le16 chan_flags; | |
1948 | } __attribute__ ((packed)) *rthdr; | |
1949 | struct sk_buff *skb = rx->skb, *skb2; | |
1950 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1951 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1952 | |
5cf121c3 | 1953 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1954 | goto out_free_skb; |
1955 | ||
1956 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1957 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1958 | goto out_free_skb; | |
1959 | ||
1960 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1961 | memset(rthdr, 0, sizeof(*rthdr)); | |
1962 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1963 | rthdr->hdr.it_present = | |
1964 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1965 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1966 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1967 | ||
5cf121c3 | 1968 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1969 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1970 | ||
1971 | if (status->band == IEEE80211_BAND_5GHZ) | |
1972 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1973 | IEEE80211_CHAN_5GHZ); | |
1974 | else | |
1975 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1976 | IEEE80211_CHAN_2GHZ); | |
1977 | ||
1978 | skb_set_mac_header(skb, 0); | |
1979 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1980 | skb->pkt_type = PACKET_OTHERHOST; | |
1981 | skb->protocol = htons(ETH_P_802_2); | |
1982 | ||
1983 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1984 | if (!netif_running(sdata->dev)) | |
1985 | continue; | |
1986 | ||
05c914fe | 1987 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1988 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1989 | continue; | |
1990 | ||
1991 | if (prev_dev) { | |
1992 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1993 | if (skb2) { | |
1994 | skb2->dev = prev_dev; | |
1995 | netif_rx(skb2); | |
1996 | } | |
1997 | } | |
1998 | ||
1999 | prev_dev = sdata->dev; | |
2000 | sdata->dev->stats.rx_packets++; | |
2001 | sdata->dev->stats.rx_bytes += skb->len; | |
2002 | } | |
2003 | ||
2004 | if (prev_dev) { | |
2005 | skb->dev = prev_dev; | |
2006 | netif_rx(skb); | |
2007 | skb = NULL; | |
2008 | } else | |
2009 | goto out_free_skb; | |
2010 | ||
5cf121c3 | 2011 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
2012 | return; |
2013 | ||
2014 | out_free_skb: | |
2015 | dev_kfree_skb(skb); | |
2016 | } | |
2017 | ||
571ecf67 | 2018 | |
8944b79f | 2019 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2020 | struct ieee80211_rx_data *rx, |
8944b79f | 2021 | struct sk_buff *skb) |
58905290 | 2022 | { |
58905290 JB |
2023 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2024 | ||
8944b79f JB |
2025 | rx->skb = skb; |
2026 | rx->sdata = sdata; | |
2027 | rx->dev = sdata->dev; | |
2028 | ||
e32f85f7 LCC |
2029 | #define CALL_RXH(rxh) \ |
2030 | do { \ | |
2031 | res = rxh(rx); \ | |
2032 | if (res != RX_CONTINUE) \ | |
2033 | goto rxh_done; \ | |
2034 | } while (0); | |
49461622 JB |
2035 | |
2036 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2037 | CALL_RXH(ieee80211_rx_h_check) | |
2038 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 2039 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
2040 | CALL_RXH(ieee80211_rx_h_sta_process) |
2041 | CALL_RXH(ieee80211_rx_h_defragment) | |
2042 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2043 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2044 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2045 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2046 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2047 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
2048 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2049 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2050 | #endif |
49461622 JB |
2051 | CALL_RXH(ieee80211_rx_h_data) |
2052 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 2053 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
2054 | CALL_RXH(ieee80211_rx_h_mgmt) |
2055 | ||
2056 | #undef CALL_RXH | |
2057 | ||
2058 | rxh_done: | |
58905290 JB |
2059 | switch (res) { |
2060 | case RX_DROP_MONITOR: | |
49461622 JB |
2061 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2062 | if (rx->sta) | |
2063 | rx->sta->rx_dropped++; | |
2064 | /* fall through */ | |
2065 | case RX_CONTINUE: | |
3d30d949 MW |
2066 | ieee80211_rx_cooked_monitor(rx); |
2067 | break; | |
58905290 | 2068 | case RX_DROP_UNUSABLE: |
49461622 JB |
2069 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2070 | if (rx->sta) | |
2071 | rx->sta->rx_dropped++; | |
58905290 JB |
2072 | dev_kfree_skb(rx->skb); |
2073 | break; | |
49461622 JB |
2074 | case RX_QUEUED: |
2075 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2076 | break; | |
58905290 JB |
2077 | } |
2078 | } | |
2079 | ||
571ecf67 JB |
2080 | /* main receive path */ |
2081 | ||
23a24def | 2082 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2083 | struct ieee80211_rx_data *rx, |
23a24def JB |
2084 | struct ieee80211_hdr *hdr) |
2085 | { | |
7ab17c45 | 2086 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2087 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2088 | ||
51fb61e7 | 2089 | switch (sdata->vif.type) { |
05c914fe | 2090 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2091 | if (!bssid) |
2092 | return 0; | |
46900298 | 2093 | if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) { |
5cf121c3 | 2094 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2095 | return 0; |
5cf121c3 | 2096 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2097 | } else if (!multicast && |
2098 | compare_ether_addr(sdata->dev->dev_addr, | |
2099 | hdr->addr1) != 0) { | |
4150c572 | 2100 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2101 | return 0; |
5cf121c3 | 2102 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2103 | } |
2104 | break; | |
05c914fe | 2105 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2106 | if (!bssid) |
2107 | return 0; | |
a7767f95 | 2108 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2109 | return 1; |
87291c02 | 2110 | } |
46900298 | 2111 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2112 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2113 | return 0; |
5cf121c3 | 2114 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2115 | } else if (!multicast && |
2116 | compare_ether_addr(sdata->dev->dev_addr, | |
2117 | hdr->addr1) != 0) { | |
4150c572 | 2118 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2119 | return 0; |
5cf121c3 | 2120 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2121 | } else if (!rx->sta) { |
2122 | int rate_idx; | |
2123 | if (rx->status->flag & RX_FLAG_HT) | |
2124 | rate_idx = 0; /* TODO: HT rates */ | |
2125 | else | |
2126 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2127 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2128 | BIT(rate_idx)); |
2129 | } | |
23a24def | 2130 | break; |
05c914fe | 2131 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2132 | if (!multicast && |
2133 | compare_ether_addr(sdata->dev->dev_addr, | |
2134 | hdr->addr1) != 0) { | |
2135 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2136 | return 0; | |
2137 | ||
5cf121c3 | 2138 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2139 | } |
2140 | break; | |
05c914fe JB |
2141 | case NL80211_IFTYPE_AP_VLAN: |
2142 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2143 | if (!bssid) { |
2144 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2145 | hdr->addr1)) | |
2146 | return 0; | |
2147 | } else if (!ieee80211_bssid_match(bssid, | |
2148 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2149 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2150 | return 0; |
5cf121c3 | 2151 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2152 | } |
23a24def | 2153 | break; |
05c914fe | 2154 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2155 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2156 | return 0; |
2157 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2158 | return 0; | |
2159 | break; | |
05c914fe | 2160 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2161 | /* take everything */ |
2162 | break; | |
05c914fe JB |
2163 | case NL80211_IFTYPE_UNSPECIFIED: |
2164 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2165 | /* should never get here */ |
2166 | WARN_ON(1); | |
2167 | break; | |
23a24def JB |
2168 | } |
2169 | ||
2170 | return 1; | |
2171 | } | |
2172 | ||
571ecf67 | 2173 | /* |
6368e4b1 RR |
2174 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2175 | * be called with rcu_read_lock protection. | |
571ecf67 | 2176 | */ |
71ebb4aa RR |
2177 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2178 | struct sk_buff *skb, | |
2179 | struct ieee80211_rx_status *status, | |
8318d78a | 2180 | struct ieee80211_rate *rate) |
571ecf67 JB |
2181 | { |
2182 | struct ieee80211_local *local = hw_to_local(hw); | |
2183 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2184 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2185 | struct ieee80211_rx_data rx; |
6368e4b1 | 2186 | int prepares; |
8e6f0032 JB |
2187 | struct ieee80211_sub_if_data *prev = NULL; |
2188 | struct sk_buff *skb_new; | |
571ecf67 | 2189 | |
358c8d9d | 2190 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2191 | memset(&rx, 0, sizeof(rx)); |
2192 | rx.skb = skb; | |
2193 | rx.local = local; | |
2194 | ||
5cf121c3 | 2195 | rx.status = status; |
5cf121c3 | 2196 | rx.rate = rate; |
72abd81b | 2197 | |
358c8d9d | 2198 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2199 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2200 | |
8944b79f JB |
2201 | rx.sta = sta_info_get(local, hdr->addr2); |
2202 | if (rx.sta) { | |
d0709a65 JB |
2203 | rx.sdata = rx.sta->sdata; |
2204 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2205 | } |
571ecf67 | 2206 | |
571ecf67 | 2207 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2208 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2209 | return; |
571ecf67 JB |
2210 | } |
2211 | ||
c2b13452 | 2212 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2213 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2214 | |
38f3714d | 2215 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2216 | ieee80211_verify_alignment(&rx); |
38f3714d | 2217 | |
571ecf67 JB |
2218 | skb = rx.skb; |
2219 | ||
79010420 | 2220 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2221 | if (!netif_running(sdata->dev)) |
2222 | continue; | |
2223 | ||
05c914fe | 2224 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2225 | continue; |
2226 | ||
5cf121c3 | 2227 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2228 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2229 | |
6368e4b1 | 2230 | if (!prepares) |
23a24def | 2231 | continue; |
8e6f0032 | 2232 | |
340e11f3 JB |
2233 | /* |
2234 | * frame is destined for this interface, but if it's not | |
2235 | * also for the previous one we handle that after the | |
2236 | * loop to avoid copying the SKB once too much | |
2237 | */ | |
2238 | ||
2239 | if (!prev) { | |
2240 | prev = sdata; | |
2241 | continue; | |
8e6f0032 | 2242 | } |
340e11f3 JB |
2243 | |
2244 | /* | |
2245 | * frame was destined for the previous interface | |
2246 | * so invoke RX handlers for it | |
2247 | */ | |
2248 | ||
2249 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2250 | if (!skb_new) { | |
2251 | if (net_ratelimit()) | |
2252 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2253 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2254 | wiphy_name(local->hw.wiphy), |
2255 | prev->dev->name); | |
340e11f3 JB |
2256 | continue; |
2257 | } | |
8944b79f | 2258 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2259 | prev = sdata; |
571ecf67 | 2260 | } |
a4b7d7bd | 2261 | if (prev) |
8944b79f | 2262 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2263 | else |
8e6f0032 | 2264 | dev_kfree_skb(skb); |
571ecf67 | 2265 | } |
6368e4b1 | 2266 | |
b580781e RR |
2267 | #define SEQ_MODULO 0x1000 |
2268 | #define SEQ_MASK 0xfff | |
2269 | ||
2270 | static inline int seq_less(u16 sq1, u16 sq2) | |
2271 | { | |
c6a1fa12 | 2272 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2273 | } |
2274 | ||
2275 | static inline u16 seq_inc(u16 sq) | |
2276 | { | |
c6a1fa12 | 2277 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2278 | } |
2279 | ||
2280 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2281 | { | |
c6a1fa12 | 2282 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2283 | } |
2284 | ||
2285 | ||
71364716 RR |
2286 | /* |
2287 | * As it function blongs to Rx path it must be called with | |
2288 | * the proper rcu_read_lock protection for its flow. | |
2289 | */ | |
c6a1fa12 JB |
2290 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2291 | struct tid_ampdu_rx *tid_agg_rx, | |
2292 | struct sk_buff *skb, | |
2293 | u16 mpdu_seq_num, | |
2294 | int bar_req) | |
b580781e RR |
2295 | { |
2296 | struct ieee80211_local *local = hw_to_local(hw); | |
2297 | struct ieee80211_rx_status status; | |
2298 | u16 head_seq_num, buf_size; | |
2299 | int index; | |
8318d78a JB |
2300 | struct ieee80211_supported_band *sband; |
2301 | struct ieee80211_rate *rate; | |
b580781e RR |
2302 | |
2303 | buf_size = tid_agg_rx->buf_size; | |
2304 | head_seq_num = tid_agg_rx->head_seq_num; | |
2305 | ||
2306 | /* frame with out of date sequence number */ | |
2307 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2308 | dev_kfree_skb(skb); | |
2309 | return 1; | |
2310 | } | |
2311 | ||
2312 | /* if frame sequence number exceeds our buffering window size or | |
2313 | * block Ack Request arrived - release stored frames */ | |
2314 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2315 | /* new head to the ordering buffer */ | |
2316 | if (bar_req) | |
2317 | head_seq_num = mpdu_seq_num; | |
2318 | else | |
2319 | head_seq_num = | |
2320 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2321 | /* release stored frames up to new head to stack */ | |
2322 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2323 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2324 | tid_agg_rx->ssn) | |
2325 | % tid_agg_rx->buf_size; | |
2326 | ||
2327 | if (tid_agg_rx->reorder_buf[index]) { | |
2328 | /* release the reordered frames to stack */ | |
2329 | memcpy(&status, | |
2330 | tid_agg_rx->reorder_buf[index]->cb, | |
2331 | sizeof(status)); | |
8318d78a | 2332 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2333 | if (status.flag & RX_FLAG_HT) { |
2334 | /* TODO: HT rates */ | |
2335 | rate = sband->bitrates; | |
2336 | } else { | |
2337 | rate = &sband->bitrates | |
2338 | [status.rate_idx]; | |
2339 | } | |
b580781e RR |
2340 | __ieee80211_rx_handle_packet(hw, |
2341 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2342 | &status, rate); |
b580781e RR |
2343 | tid_agg_rx->stored_mpdu_num--; |
2344 | tid_agg_rx->reorder_buf[index] = NULL; | |
2345 | } | |
2346 | tid_agg_rx->head_seq_num = | |
2347 | seq_inc(tid_agg_rx->head_seq_num); | |
2348 | } | |
2349 | if (bar_req) | |
2350 | return 1; | |
2351 | } | |
2352 | ||
2353 | /* now the new frame is always in the range of the reordering */ | |
2354 | /* buffer window */ | |
2355 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2356 | % tid_agg_rx->buf_size; | |
2357 | /* check if we already stored this frame */ | |
2358 | if (tid_agg_rx->reorder_buf[index]) { | |
2359 | dev_kfree_skb(skb); | |
2360 | return 1; | |
2361 | } | |
2362 | ||
2363 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2364 | /* release it immediately */ | |
2365 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2366 | tid_agg_rx->stored_mpdu_num == 0) { | |
2367 | tid_agg_rx->head_seq_num = | |
2368 | seq_inc(tid_agg_rx->head_seq_num); | |
2369 | return 0; | |
2370 | } | |
2371 | ||
2372 | /* put the frame in the reordering buffer */ | |
2373 | tid_agg_rx->reorder_buf[index] = skb; | |
2374 | tid_agg_rx->stored_mpdu_num++; | |
2375 | /* release the buffer until next missing frame */ | |
2376 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2377 | % tid_agg_rx->buf_size; | |
2378 | while (tid_agg_rx->reorder_buf[index]) { | |
2379 | /* release the reordered frame back to stack */ | |
2380 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2381 | sizeof(status)); | |
8318d78a | 2382 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2383 | if (status.flag & RX_FLAG_HT) |
2384 | rate = sband->bitrates; /* TODO: HT rates */ | |
2385 | else | |
2386 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2387 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2388 | &status, rate); |
b580781e RR |
2389 | tid_agg_rx->stored_mpdu_num--; |
2390 | tid_agg_rx->reorder_buf[index] = NULL; | |
2391 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2392 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2393 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2394 | } | |
2395 | return 1; | |
2396 | } | |
2397 | ||
71ebb4aa RR |
2398 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2399 | struct sk_buff *skb) | |
b580781e RR |
2400 | { |
2401 | struct ieee80211_hw *hw = &local->hw; | |
2402 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2403 | struct sta_info *sta; | |
2404 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2405 | u16 sc; |
b580781e | 2406 | u16 mpdu_seq_num; |
182503ab | 2407 | u8 ret = 0; |
b580781e RR |
2408 | int tid; |
2409 | ||
2410 | sta = sta_info_get(local, hdr->addr2); | |
2411 | if (!sta) | |
2412 | return ret; | |
2413 | ||
b580781e RR |
2414 | /* filter the QoS data rx stream according to |
2415 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2416 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2417 | goto end_reorder; |
2418 | ||
238f74a2 | 2419 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2420 | |
cee24a3e | 2421 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2422 | goto end_reorder; |
2423 | ||
cee24a3e RR |
2424 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2425 | ||
2560b6e2 EG |
2426 | /* qos null data frames are excluded */ |
2427 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2428 | goto end_reorder; |
2429 | ||
2430 | /* new un-ordered ampdu frame - process it */ | |
2431 | ||
2432 | /* reset session timer */ | |
20ad19d0 JB |
2433 | if (tid_agg_rx->timeout) |
2434 | mod_timer(&tid_agg_rx->session_timer, | |
2435 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2436 | |
2437 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2438 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2439 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2440 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2441 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2442 | ret = 1; | |
2443 | goto end_reorder; | |
2444 | } | |
2445 | ||
2446 | /* according to mpdu sequence number deal with reordering buffer */ | |
2447 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2448 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2449 | mpdu_seq_num, 0); | |
d0709a65 | 2450 | end_reorder: |
b580781e RR |
2451 | return ret; |
2452 | } | |
2453 | ||
6368e4b1 RR |
2454 | /* |
2455 | * This is the receive path handler. It is called by a low level driver when an | |
2456 | * 802.11 MPDU is received from the hardware. | |
2457 | */ | |
2458 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2459 | struct ieee80211_rx_status *status) | |
2460 | { | |
2461 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2462 | struct ieee80211_rate *rate = NULL; |
2463 | struct ieee80211_supported_band *sband; | |
2464 | ||
2465 | if (status->band < 0 || | |
13d8fd2d | 2466 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2467 | WARN_ON(1); |
2468 | return; | |
2469 | } | |
2470 | ||
2471 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2472 | if (!sband) { |
8318d78a JB |
2473 | WARN_ON(1); |
2474 | return; | |
2475 | } | |
2476 | ||
0fb8ca45 JM |
2477 | if (status->flag & RX_FLAG_HT) { |
2478 | /* rate_idx is MCS index */ | |
2479 | if (WARN_ON(status->rate_idx < 0 || | |
2480 | status->rate_idx >= 76)) | |
2481 | return; | |
2482 | /* HT rates are not in the table - use the highest legacy rate | |
2483 | * for now since other parts of mac80211 may not yet be fully | |
2484 | * MCS aware. */ | |
2485 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2486 | } else { | |
2487 | if (WARN_ON(status->rate_idx < 0 || | |
2488 | status->rate_idx >= sband->n_bitrates)) | |
2489 | return; | |
2490 | rate = &sband->bitrates[status->rate_idx]; | |
2491 | } | |
6368e4b1 RR |
2492 | |
2493 | /* | |
2494 | * key references and virtual interfaces are protected using RCU | |
2495 | * and this requires that we are in a read-side RCU section during | |
2496 | * receive processing | |
2497 | */ | |
2498 | rcu_read_lock(); | |
2499 | ||
2500 | /* | |
2501 | * Frames with failed FCS/PLCP checksum are not returned, | |
2502 | * all other frames are returned without radiotap header | |
2503 | * if it was previously present. | |
2504 | * Also, frames with less than 16 bytes are dropped. | |
2505 | */ | |
8318d78a | 2506 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2507 | if (!skb) { |
2508 | rcu_read_unlock(); | |
2509 | return; | |
2510 | } | |
2511 | ||
b580781e | 2512 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2513 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2514 | |
2515 | rcu_read_unlock(); | |
2516 | } | |
571ecf67 JB |
2517 | EXPORT_SYMBOL(__ieee80211_rx); |
2518 | ||
2519 | /* This is a version of the rx handler that can be called from hard irq | |
2520 | * context. Post the skb on the queue and schedule the tasklet */ | |
2521 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2522 | struct ieee80211_rx_status *status) | |
2523 | { | |
2524 | struct ieee80211_local *local = hw_to_local(hw); | |
2525 | ||
2526 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2527 | ||
2528 | skb->dev = local->mdev; | |
2529 | /* copy status into skb->cb for use by tasklet */ | |
2530 | memcpy(skb->cb, status, sizeof(*status)); | |
2531 | skb->pkt_type = IEEE80211_RX_MSG; | |
2532 | skb_queue_tail(&local->skb_queue, skb); | |
2533 | tasklet_schedule(&local->tasklet); | |
2534 | } | |
2535 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |