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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 | ||
133b8226 | 734 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 735 | { |
133b8226 | 736 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 737 | struct ieee80211_local *local = sdata->local; |
0795af57 | 738 | |
3e122be0 | 739 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 740 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
89fad578 CL |
741 | if (local->ops->sta_notify) |
742 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
743 | STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 744 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
745 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
746 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
747 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
748 | } | |
749 | ||
133b8226 | 750 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 751 | { |
133b8226 JB |
752 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
753 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
754 | struct sk_buff *skb; |
755 | int sent = 0; | |
571ecf67 | 756 | |
3e122be0 | 757 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 758 | |
07346f81 | 759 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
89fad578 CL |
760 | if (local->ops->sta_notify) |
761 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
762 | STA_NOTIFY_AWAKE, &sta->sta); | |
004c872e JB |
763 | |
764 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
765 | sta_info_clear_tim_bit(sta); | |
766 | ||
571ecf67 | 767 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
768 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
769 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 770 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 771 | |
571ecf67 JB |
772 | /* Send all buffered frames to the station */ |
773 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 774 | sent++; |
8b30b1fe | 775 | skb->requeue = 1; |
571ecf67 JB |
776 | dev_queue_xmit(skb); |
777 | } | |
778 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
779 | local->total_ps_buffered--; |
780 | sent++; | |
781 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 782 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 783 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 784 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 785 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 786 | skb->requeue = 1; |
571ecf67 JB |
787 | dev_queue_xmit(skb); |
788 | } | |
789 | ||
790 | return sent; | |
791 | } | |
792 | ||
49461622 | 793 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 794 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
795 | { |
796 | struct sta_info *sta = rx->sta; | |
a7767f95 | 797 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
798 | |
799 | if (!sta) | |
9ae54c84 | 800 | return RX_CONTINUE; |
571ecf67 JB |
801 | |
802 | /* Update last_rx only for IBSS packets which are for the current | |
803 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
804 | * other STAs are using different BSSID. */ | |
05c914fe | 805 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 806 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 807 | NL80211_IFTYPE_ADHOC); |
571ecf67 JB |
808 | if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0) |
809 | sta->last_rx = jiffies; | |
810 | } else | |
811 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 812 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
813 | /* Update last_rx only for unicast frames in order to prevent |
814 | * the Probe Request frames (the only broadcast frames from a | |
815 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
816 | * Mesh beacons will update last_rx when if they are found to |
817 | * match the current local configuration when processed. | |
571ecf67 JB |
818 | */ |
819 | sta->last_rx = jiffies; | |
820 | } | |
821 | ||
5cf121c3 | 822 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 823 | return RX_CONTINUE; |
571ecf67 JB |
824 | |
825 | sta->rx_fragments++; | |
826 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 827 | sta->last_signal = rx->status->signal; |
566bfe5a | 828 | sta->last_qual = rx->status->qual; |
5cf121c3 | 829 | sta->last_noise = rx->status->noise; |
571ecf67 | 830 | |
72eaa43a JB |
831 | /* |
832 | * Change STA power saving mode only at the end of a frame | |
833 | * exchange sequence. | |
834 | */ | |
3e122be0 | 835 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
836 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
837 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
838 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
839 | /* | |
840 | * Ignore doze->wake transitions that are | |
841 | * indicated by non-data frames, the standard | |
842 | * is unclear here, but for example going to | |
843 | * PS mode and then scanning would cause a | |
844 | * doze->wake transition for the probe request, | |
845 | * and that is clearly undesirable. | |
846 | */ | |
847 | if (ieee80211_is_data(hdr->frame_control) && | |
848 | !ieee80211_has_pm(hdr->frame_control)) | |
849 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
850 | } else { | |
851 | if (ieee80211_has_pm(hdr->frame_control)) | |
852 | ap_sta_ps_start(sta); | |
853 | } | |
571ecf67 JB |
854 | } |
855 | ||
856 | /* Drop data::nullfunc frames silently, since they are used only to | |
857 | * control station power saving mode. */ | |
a7767f95 | 858 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
859 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
860 | /* Update counter and free packet here to avoid counting this | |
861 | * as a dropped packed. */ | |
862 | sta->rx_packets++; | |
863 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 864 | return RX_QUEUED; |
571ecf67 JB |
865 | } |
866 | ||
9ae54c84 | 867 | return RX_CONTINUE; |
571ecf67 JB |
868 | } /* ieee80211_rx_h_sta_process */ |
869 | ||
571ecf67 JB |
870 | static inline struct ieee80211_fragment_entry * |
871 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
872 | unsigned int frag, unsigned int seq, int rx_queue, | |
873 | struct sk_buff **skb) | |
874 | { | |
875 | struct ieee80211_fragment_entry *entry; | |
876 | int idx; | |
877 | ||
878 | idx = sdata->fragment_next; | |
879 | entry = &sdata->fragments[sdata->fragment_next++]; | |
880 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
881 | sdata->fragment_next = 0; | |
882 | ||
883 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 884 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
885 | struct ieee80211_hdr *hdr = |
886 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
887 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
888 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 889 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
890 | sdata->dev->name, idx, |
891 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 892 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 893 | #endif |
571ecf67 JB |
894 | __skb_queue_purge(&entry->skb_list); |
895 | } | |
896 | ||
897 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
898 | *skb = NULL; | |
899 | entry->first_frag_time = jiffies; | |
900 | entry->seq = seq; | |
901 | entry->rx_queue = rx_queue; | |
902 | entry->last_frag = frag; | |
903 | entry->ccmp = 0; | |
904 | entry->extra_len = 0; | |
905 | ||
906 | return entry; | |
907 | } | |
908 | ||
909 | static inline struct ieee80211_fragment_entry * | |
910 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 911 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
912 | int rx_queue, struct ieee80211_hdr *hdr) |
913 | { | |
914 | struct ieee80211_fragment_entry *entry; | |
915 | int i, idx; | |
916 | ||
917 | idx = sdata->fragment_next; | |
918 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
919 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
920 | |
921 | idx--; | |
922 | if (idx < 0) | |
923 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
924 | ||
925 | entry = &sdata->fragments[idx]; | |
926 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
927 | entry->rx_queue != rx_queue || | |
928 | entry->last_frag + 1 != frag) | |
929 | continue; | |
930 | ||
b73d70ad | 931 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 932 | |
b73d70ad HH |
933 | /* |
934 | * Check ftype and addresses are equal, else check next fragment | |
935 | */ | |
936 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
937 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
938 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
939 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
940 | continue; | |
941 | ||
ab46623e | 942 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
943 | __skb_queue_purge(&entry->skb_list); |
944 | continue; | |
945 | } | |
946 | return entry; | |
947 | } | |
948 | ||
949 | return NULL; | |
950 | } | |
951 | ||
49461622 | 952 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 953 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
954 | { |
955 | struct ieee80211_hdr *hdr; | |
956 | u16 sc; | |
358c8d9d | 957 | __le16 fc; |
571ecf67 JB |
958 | unsigned int frag, seq; |
959 | struct ieee80211_fragment_entry *entry; | |
960 | struct sk_buff *skb; | |
961 | ||
b73d70ad | 962 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 963 | fc = hdr->frame_control; |
571ecf67 JB |
964 | sc = le16_to_cpu(hdr->seq_ctrl); |
965 | frag = sc & IEEE80211_SCTL_FRAG; | |
966 | ||
358c8d9d | 967 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
968 | (rx->skb)->len < 24 || |
969 | is_multicast_ether_addr(hdr->addr1))) { | |
970 | /* not fragmented */ | |
971 | goto out; | |
972 | } | |
973 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
974 | ||
975 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
976 | ||
977 | if (frag == 0) { | |
978 | /* This is the first fragment of a new frame. */ | |
979 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 980 | rx->queue, &(rx->skb)); |
8f20fc24 | 981 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 982 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
983 | /* Store CCMP PN so that we can verify that the next |
984 | * fragment has a sequential PN value. */ | |
985 | entry->ccmp = 1; | |
986 | memcpy(entry->last_pn, | |
5cf121c3 | 987 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
988 | CCMP_PN_LEN); |
989 | } | |
9ae54c84 | 990 | return RX_QUEUED; |
571ecf67 JB |
991 | } |
992 | ||
993 | /* This is a fragment for a frame that should already be pending in | |
994 | * fragment cache. Add this fragment to the end of the pending entry. | |
995 | */ | |
b73d70ad | 996 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
997 | if (!entry) { |
998 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 999 | return RX_DROP_MONITOR; |
571ecf67 JB |
1000 | } |
1001 | ||
1002 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1003 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1004 | if (entry->ccmp) { | |
1005 | int i; | |
1006 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1007 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1008 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1009 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1010 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1011 | pn[i]++; | |
1012 | if (pn[i]) | |
1013 | break; | |
1014 | } | |
5cf121c3 | 1015 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1016 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1017 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1018 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1019 | } | |
1020 | ||
358c8d9d | 1021 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1022 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1023 | entry->last_frag = frag; | |
1024 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1025 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1026 | rx->skb = NULL; |
9ae54c84 | 1027 | return RX_QUEUED; |
571ecf67 JB |
1028 | } |
1029 | ||
1030 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1031 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1032 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1033 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1034 | GFP_ATOMIC))) { | |
1035 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1036 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1037 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1038 | } |
1039 | } | |
1040 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1041 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1042 | dev_kfree_skb(skb); | |
1043 | } | |
1044 | ||
1045 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1046 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1047 | |
1048 | out: | |
1049 | if (rx->sta) | |
1050 | rx->sta->rx_packets++; | |
1051 | if (is_multicast_ether_addr(hdr->addr1)) | |
1052 | rx->local->dot11MulticastReceivedFrameCount++; | |
1053 | else | |
1054 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1055 | return RX_CONTINUE; |
571ecf67 JB |
1056 | } |
1057 | ||
49461622 | 1058 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1059 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1060 | { |
98f0b0a3 | 1061 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1062 | struct sk_buff *skb; |
1063 | int no_pending_pkts; | |
358c8d9d | 1064 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1065 | |
358c8d9d | 1066 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1067 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1068 | return RX_CONTINUE; |
571ecf67 | 1069 | |
05c914fe JB |
1070 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1071 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1072 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1073 | |
571ecf67 JB |
1074 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1075 | if (!skb) { | |
1076 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1077 | if (skb) | |
1078 | rx->local->total_ps_buffered--; | |
1079 | } | |
1080 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1081 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1082 | ||
1083 | if (skb) { | |
1084 | struct ieee80211_hdr *hdr = | |
1085 | (struct ieee80211_hdr *) skb->data; | |
1086 | ||
4a9a66e9 JB |
1087 | /* |
1088 | * Tell TX path to send one frame even though the STA may | |
1089 | * still remain is PS mode after this frame exchange. | |
1090 | */ | |
07346f81 | 1091 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1092 | |
1093 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1094 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1095 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1096 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1097 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1098 | ||
1099 | /* Use MoreData flag to indicate whether there are more | |
1100 | * buffered frames for this STA */ | |
836341a7 | 1101 | if (no_pending_pkts) |
571ecf67 | 1102 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1103 | else |
571ecf67 JB |
1104 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1105 | ||
1106 | dev_queue_xmit(skb); | |
1107 | ||
004c872e JB |
1108 | if (no_pending_pkts) |
1109 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1110 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1111 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1112 | /* |
1113 | * FIXME: This can be the result of a race condition between | |
1114 | * us expiring a frame and the station polling for it. | |
1115 | * Should we send it a null-func frame indicating we | |
1116 | * have nothing buffered for it? | |
1117 | */ | |
0c68ae26 | 1118 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1119 | "though there are no buffered frames for it\n", |
0c68ae26 | 1120 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1121 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1122 | } |
1123 | ||
9ae54c84 | 1124 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1125 | * count as an dropped frame. */ |
1126 | dev_kfree_skb(rx->skb); | |
1127 | ||
9ae54c84 | 1128 | return RX_QUEUED; |
571ecf67 JB |
1129 | } |
1130 | ||
49461622 | 1131 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1132 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1133 | { |
6e0d114d | 1134 | u8 *data = rx->skb->data; |
238f74a2 | 1135 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1136 | |
238f74a2 | 1137 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1138 | return RX_CONTINUE; |
6e0d114d JB |
1139 | |
1140 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1141 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1142 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1143 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1144 | /* change frame type to non QOS */ |
238f74a2 | 1145 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1146 | |
9ae54c84 | 1147 | return RX_CONTINUE; |
6e0d114d JB |
1148 | } |
1149 | ||
76ee65bf | 1150 | static int |
5cf121c3 | 1151 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1152 | { |
07346f81 | 1153 | if (unlikely(!rx->sta || |
f4ea83dd | 1154 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1155 | return -EACCES; |
571ecf67 | 1156 | |
76ee65bf | 1157 | return 0; |
571ecf67 JB |
1158 | } |
1159 | ||
76ee65bf | 1160 | static int |
358c8d9d | 1161 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1162 | { |
3017b80b | 1163 | /* |
7848ba7d JB |
1164 | * Pass through unencrypted frames if the hardware has |
1165 | * decrypted them already. | |
3017b80b | 1166 | */ |
5cf121c3 | 1167 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1168 | return 0; |
571ecf67 JB |
1169 | |
1170 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1171 | if (unlikely(!ieee80211_has_protected(fc) && |
1172 | !ieee80211_is_nullfunc(fc) && | |
3cfcf6ac JM |
1173 | (!ieee80211_is_mgmt(fc) || |
1174 | (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1175 | rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) && | |
1176 | (rx->key || rx->sdata->drop_unencrypted))) | |
1177 | return -EACCES; | |
1178 | /* BIP does not use Protected field, so need to check MMIE */ | |
1179 | if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) && | |
1180 | ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && | |
1181 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
b3fc9c6c | 1182 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1183 | return -EACCES; |
b3fc9c6c | 1184 | |
76ee65bf | 1185 | return 0; |
571ecf67 JB |
1186 | } |
1187 | ||
76ee65bf | 1188 | static int |
5cf121c3 | 1189 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1190 | { |
1191 | struct net_device *dev = rx->dev; | |
571ecf67 | 1192 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1193 | u16 hdrlen, ethertype; |
571ecf67 JB |
1194 | u8 *payload; |
1195 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1196 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1197 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1198 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1199 | ||
b73d70ad | 1200 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1201 | return -1; |
571ecf67 | 1202 | |
b73d70ad | 1203 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1204 | |
1205 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1206 | * header | |
1207 | * IEEE 802.11 address fields: | |
1208 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1209 | * 0 0 DA SA BSSID n/a | |
1210 | * 0 1 DA BSSID SA n/a | |
1211 | * 1 0 BSSID SA DA n/a | |
1212 | * 1 1 RA TA DA SA | |
1213 | */ | |
b73d70ad HH |
1214 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1215 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1216 | |
b73d70ad HH |
1217 | switch (hdr->frame_control & |
1218 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
c1b4aa3f | 1219 | case cpu_to_le16(IEEE80211_FCTL_TODS): |
05c914fe JB |
1220 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1221 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1222 | return -1; |
571ecf67 | 1223 | break; |
c1b4aa3f | 1224 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1225 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1226 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1227 | return -1; |
79617dee Y |
1228 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1229 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1230 | (skb->data + hdrlen); | |
1231 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1232 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1233 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1234 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1235 | } | |
1236 | } | |
571ecf67 | 1237 | break; |
c1b4aa3f | 1238 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1239 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1240 | (is_multicast_ether_addr(dst) && |
1241 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1242 | return -1; |
571ecf67 | 1243 | break; |
c1b4aa3f | 1244 | case cpu_to_le16(0): |
05c914fe | 1245 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1246 | return -1; |
571ecf67 JB |
1247 | break; |
1248 | } | |
1249 | ||
f4ea83dd | 1250 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1251 | return -1; |
571ecf67 | 1252 | |
76ee65bf | 1253 | payload = skb->data + hdrlen; |
571ecf67 JB |
1254 | ethertype = (payload[6] << 8) | payload[7]; |
1255 | ||
1256 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1257 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1258 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1259 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1260 | * replace EtherType */ | |
1261 | skb_pull(skb, hdrlen + 6); | |
1262 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1263 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1264 | } else { | |
1265 | struct ethhdr *ehdr; | |
1266 | __be16 len; | |
ce3edf6d | 1267 | |
571ecf67 JB |
1268 | skb_pull(skb, hdrlen); |
1269 | len = htons(skb->len); | |
1270 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1271 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1272 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1273 | ehdr->h_proto = len; | |
1274 | } | |
76ee65bf RR |
1275 | return 0; |
1276 | } | |
571ecf67 | 1277 | |
ce3edf6d JB |
1278 | /* |
1279 | * requires that rx->skb is a frame with ethernet header | |
1280 | */ | |
358c8d9d | 1281 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1282 | { |
c97c23e3 | 1283 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1284 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1285 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1286 | ||
1287 | /* | |
1288 | * Allow EAPOL frames to us/the PAE group address regardless | |
1289 | * of whether the frame was encrypted or not. | |
1290 | */ | |
1291 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1292 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1293 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1294 | return true; | |
1295 | ||
1296 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1297 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1298 | return false; |
1299 | ||
1300 | return true; | |
1301 | } | |
1302 | ||
1303 | /* | |
1304 | * requires that rx->skb is a frame with ethernet header | |
1305 | */ | |
76ee65bf | 1306 | static void |
5cf121c3 | 1307 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1308 | { |
1309 | struct net_device *dev = rx->dev; | |
1310 | struct ieee80211_local *local = rx->local; | |
1311 | struct sk_buff *skb, *xmit_skb; | |
1312 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1313 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1314 | struct sta_info *dsta; | |
571ecf67 | 1315 | |
76ee65bf RR |
1316 | skb = rx->skb; |
1317 | xmit_skb = NULL; | |
571ecf67 | 1318 | |
05c914fe JB |
1319 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1320 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1321 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1322 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1323 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1324 | /* | |
1325 | * send multicast frames both to higher layers in | |
1326 | * local net stack and back to the wireless medium | |
1327 | */ | |
76ee65bf RR |
1328 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1329 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1330 | printk(KERN_DEBUG "%s: failed to clone " |
1331 | "multicast frame\n", dev->name); | |
1332 | } else { | |
571ecf67 | 1333 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1334 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1335 | /* |
1336 | * The destination station is associated to | |
1337 | * this AP (in this VLAN), so send the frame | |
1338 | * directly to it and do not pass it to local | |
1339 | * net stack. | |
571ecf67 | 1340 | */ |
76ee65bf | 1341 | xmit_skb = skb; |
571ecf67 JB |
1342 | skb = NULL; |
1343 | } | |
571ecf67 JB |
1344 | } |
1345 | } | |
1346 | ||
1347 | if (skb) { | |
d1c3a37c JB |
1348 | int align __maybe_unused; |
1349 | ||
1350 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1351 | /* | |
1352 | * 'align' will only take the values 0 or 2 here | |
1353 | * since all frames are required to be aligned | |
1354 | * to 2-byte boundaries when being passed to | |
1355 | * mac80211. That also explains the __skb_push() | |
1356 | * below. | |
1357 | */ | |
1358 | align = (unsigned long)skb->data & 4; | |
1359 | if (align) { | |
1360 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1361 | dev_kfree_skb(skb); | |
1362 | skb = NULL; | |
1363 | } else { | |
1364 | u8 *data = skb->data; | |
1365 | size_t len = skb->len; | |
1366 | u8 *new = __skb_push(skb, align); | |
1367 | memmove(new, data, len); | |
1368 | __skb_trim(skb, len); | |
1369 | } | |
1370 | } | |
1371 | #endif | |
1372 | ||
1373 | if (skb) { | |
1374 | /* deliver to local stack */ | |
1375 | skb->protocol = eth_type_trans(skb, dev); | |
1376 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1377 | netif_rx(skb); | |
1378 | } | |
571ecf67 JB |
1379 | } |
1380 | ||
76ee65bf | 1381 | if (xmit_skb) { |
571ecf67 | 1382 | /* send to wireless media */ |
f831e909 | 1383 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1384 | skb_reset_network_header(xmit_skb); |
1385 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1386 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1387 | } |
76ee65bf RR |
1388 | } |
1389 | ||
49461622 | 1390 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1391 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1392 | { |
1393 | struct net_device *dev = rx->dev; | |
1394 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1395 | u16 ethertype; |
fd4c7f2f RR |
1396 | u8 *payload; |
1397 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1398 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1399 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1400 | const struct ethhdr *eth; |
1401 | int remaining, err; | |
1402 | u8 dst[ETH_ALEN]; | |
1403 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1404 | |
358c8d9d | 1405 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1406 | return RX_CONTINUE; |
fd4c7f2f | 1407 | |
358c8d9d | 1408 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1409 | return RX_DROP_MONITOR; |
fd4c7f2f | 1410 | |
5cf121c3 | 1411 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1412 | return RX_CONTINUE; |
fd4c7f2f RR |
1413 | |
1414 | err = ieee80211_data_to_8023(rx); | |
1415 | if (unlikely(err)) | |
e4c26add | 1416 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1417 | |
1418 | skb->dev = dev; | |
1419 | ||
1420 | dev->stats.rx_packets++; | |
1421 | dev->stats.rx_bytes += skb->len; | |
1422 | ||
1423 | /* skip the wrapping header */ | |
1424 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1425 | if (!eth) | |
e4c26add | 1426 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1427 | |
1428 | while (skb != frame) { | |
1429 | u8 padding; | |
1430 | __be16 len = eth->h_proto; | |
1431 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1432 | ||
1433 | remaining = skb->len; | |
1434 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1435 | memcpy(src, eth->h_source, ETH_ALEN); | |
1436 | ||
1437 | padding = ((4 - subframe_len) & 0x3); | |
1438 | /* the last MSDU has no padding */ | |
f4ea83dd | 1439 | if (subframe_len > remaining) |
e4c26add | 1440 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1441 | |
1442 | skb_pull(skb, sizeof(struct ethhdr)); | |
1443 | /* if last subframe reuse skb */ | |
1444 | if (remaining <= subframe_len + padding) | |
1445 | frame = skb; | |
1446 | else { | |
d1c3a37c JB |
1447 | /* |
1448 | * Allocate and reserve two bytes more for payload | |
1449 | * alignment since sizeof(struct ethhdr) is 14. | |
1450 | */ | |
1451 | frame = dev_alloc_skb( | |
1452 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1453 | subframe_len + 2); | |
fd4c7f2f RR |
1454 | |
1455 | if (frame == NULL) | |
e4c26add | 1456 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1457 | |
d1c3a37c JB |
1458 | skb_reserve(frame, |
1459 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1460 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1461 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1462 | ntohs(len)); | |
1463 | ||
1464 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1465 | padding); | |
1466 | if (!eth) { | |
fd4c7f2f | 1467 | dev_kfree_skb(frame); |
e4c26add | 1468 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1469 | } |
1470 | } | |
1471 | ||
ce3edf6d | 1472 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1473 | frame->dev = dev; |
1474 | frame->priority = skb->priority; | |
1475 | rx->skb = frame; | |
1476 | ||
fd4c7f2f RR |
1477 | payload = frame->data; |
1478 | ethertype = (payload[6] << 8) | payload[7]; | |
1479 | ||
1480 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1481 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1482 | compare_ether_addr(payload, | |
1483 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1484 | /* remove RFC1042 or Bridge-Tunnel |
1485 | * encapsulation and replace EtherType */ | |
1486 | skb_pull(frame, 6); | |
1487 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1488 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1489 | } else { | |
ce3edf6d JB |
1490 | memcpy(skb_push(frame, sizeof(__be16)), |
1491 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1492 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1493 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1494 | } | |
1495 | ||
358c8d9d | 1496 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1497 | if (skb == frame) /* last frame */ |
e4c26add | 1498 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1499 | dev_kfree_skb(frame); |
1500 | continue; | |
1501 | } | |
fd4c7f2f RR |
1502 | |
1503 | ieee80211_deliver_skb(rx); | |
1504 | } | |
1505 | ||
9ae54c84 | 1506 | return RX_QUEUED; |
fd4c7f2f RR |
1507 | } |
1508 | ||
bf94e17b | 1509 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1510 | static ieee80211_rx_result |
e32f85f7 LCC |
1511 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1512 | { | |
1513 | struct ieee80211_hdr *hdr; | |
1514 | struct ieee80211s_hdr *mesh_hdr; | |
1515 | unsigned int hdrlen; | |
1516 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1517 | ||
1518 | hdr = (struct ieee80211_hdr *) skb->data; | |
1519 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1520 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1521 | ||
1522 | if (!ieee80211_is_data(hdr->frame_control)) | |
1523 | return RX_CONTINUE; | |
1524 | ||
1525 | if (!mesh_hdr->ttl) | |
1526 | /* illegal frame */ | |
1527 | return RX_DROP_MONITOR; | |
1528 | ||
79617dee Y |
1529 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1530 | struct ieee80211_sub_if_data *sdata; | |
1531 | struct mesh_path *mppath; | |
1532 | ||
1533 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1534 | rcu_read_lock(); | |
1535 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1536 | if (!mppath) { | |
1537 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1538 | } else { | |
1539 | spin_lock_bh(&mppath->state_lock); | |
1540 | mppath->exp_time = jiffies; | |
1541 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1542 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1543 | spin_unlock_bh(&mppath->state_lock); | |
1544 | } | |
1545 | rcu_read_unlock(); | |
1546 | } | |
1547 | ||
e32f85f7 LCC |
1548 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1549 | return RX_CONTINUE; | |
1550 | ||
1551 | mesh_hdr->ttl--; | |
1552 | ||
1553 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1554 | if (!mesh_hdr->ttl) | |
472dbc45 | 1555 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1556 | dropped_frames_ttl); |
1557 | else { | |
1558 | struct ieee80211_hdr *fwd_hdr; | |
1559 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1560 | ||
1561 | if (!fwd_skb && net_ratelimit()) | |
1562 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1563 | rx->dev->name); | |
1564 | ||
1565 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1566 | /* | |
1567 | * Save TA to addr1 to send TA a path error if a | |
1568 | * suitable next hop is not found | |
1569 | */ | |
1570 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1571 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1572 | fwd_skb->dev = rx->local->mdev; | |
1573 | fwd_skb->iif = rx->dev->ifindex; | |
1574 | dev_queue_xmit(fwd_skb); | |
1575 | } | |
1576 | } | |
1577 | ||
1578 | if (is_multicast_ether_addr(hdr->addr3) || | |
1579 | rx->dev->flags & IFF_PROMISC) | |
1580 | return RX_CONTINUE; | |
1581 | else | |
1582 | return RX_DROP_MONITOR; | |
1583 | } | |
bf94e17b | 1584 | #endif |
e32f85f7 | 1585 | |
49461622 | 1586 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1587 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1588 | { |
1589 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1590 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1591 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1592 | int err; |
76ee65bf | 1593 | |
358c8d9d | 1594 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1595 | return RX_CONTINUE; |
76ee65bf | 1596 | |
358c8d9d | 1597 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1598 | return RX_DROP_MONITOR; |
76ee65bf | 1599 | |
76ee65bf RR |
1600 | err = ieee80211_data_to_8023(rx); |
1601 | if (unlikely(err)) | |
e4c26add | 1602 | return RX_DROP_UNUSABLE; |
76ee65bf | 1603 | |
358c8d9d | 1604 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1605 | return RX_DROP_MONITOR; |
ce3edf6d | 1606 | |
76ee65bf RR |
1607 | rx->skb->dev = dev; |
1608 | ||
1609 | dev->stats.rx_packets++; | |
1610 | dev->stats.rx_bytes += rx->skb->len; | |
1611 | ||
1612 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1613 | |
9ae54c84 | 1614 | return RX_QUEUED; |
571ecf67 JB |
1615 | } |
1616 | ||
49461622 | 1617 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1618 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1619 | { |
1620 | struct ieee80211_local *local = rx->local; | |
1621 | struct ieee80211_hw *hw = &local->hw; | |
1622 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1623 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1624 | struct tid_ampdu_rx *tid_agg_rx; |
1625 | u16 start_seq_num; | |
1626 | u16 tid; | |
1627 | ||
a7767f95 | 1628 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1629 | return RX_CONTINUE; |
71364716 | 1630 | |
a7767f95 | 1631 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1632 | if (!rx->sta) |
9ae54c84 | 1633 | return RX_CONTINUE; |
71364716 | 1634 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1635 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1636 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1637 | return RX_CONTINUE; |
cee24a3e | 1638 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1639 | |
1640 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1641 | ||
1642 | /* reset session timer */ | |
1643 | if (tid_agg_rx->timeout) { | |
1644 | unsigned long expires = | |
1645 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
1646 | mod_timer(&tid_agg_rx->session_timer, expires); | |
1647 | } | |
1648 | ||
1649 | /* manage reordering buffer according to requested */ | |
1650 | /* sequence number */ | |
1651 | rcu_read_lock(); | |
1652 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1653 | start_seq_num, 1); | |
1654 | rcu_read_unlock(); | |
e4c26add | 1655 | return RX_DROP_UNUSABLE; |
71364716 RR |
1656 | } |
1657 | ||
9ae54c84 | 1658 | return RX_CONTINUE; |
71364716 RR |
1659 | } |
1660 | ||
f4f727a6 JM |
1661 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1662 | struct ieee80211_mgmt *mgmt, | |
1663 | size_t len) | |
fea14732 JM |
1664 | { |
1665 | struct ieee80211_local *local = sdata->local; | |
1666 | struct sk_buff *skb; | |
1667 | struct ieee80211_mgmt *resp; | |
1668 | ||
1669 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1670 | /* Not to own unicast address */ | |
1671 | return; | |
1672 | } | |
1673 | ||
1674 | if (compare_ether_addr(mgmt->sa, sdata->u.sta.bssid) != 0 || | |
1675 | compare_ether_addr(mgmt->bssid, sdata->u.sta.bssid) != 0) { | |
1676 | /* Not from the current AP. */ | |
1677 | return; | |
1678 | } | |
1679 | ||
1680 | if (sdata->u.sta.state == IEEE80211_STA_MLME_ASSOCIATE) { | |
1681 | /* Association in progress; ignore SA Query */ | |
1682 | return; | |
1683 | } | |
1684 | ||
1685 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1686 | /* Too short SA Query request frame */ | |
1687 | return; | |
1688 | } | |
1689 | ||
1690 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1691 | if (skb == NULL) | |
1692 | return; | |
1693 | ||
1694 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1695 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1696 | memset(resp, 0, 24); | |
1697 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1698 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
1699 | memcpy(resp->bssid, sdata->u.sta.bssid, ETH_ALEN); | |
1700 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
1701 | IEEE80211_STYPE_ACTION); | |
1702 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1703 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1704 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1705 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1706 | mgmt->u.action.u.sa_query.trans_id, | |
1707 | WLAN_SA_QUERY_TR_ID_LEN); | |
1708 | ||
1709 | ieee80211_tx_skb(sdata, skb, 1); | |
1710 | } | |
1711 | ||
de1ede7a JB |
1712 | static ieee80211_rx_result debug_noinline |
1713 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1714 | { | |
1715 | struct ieee80211_local *local = rx->local; | |
1716 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
c481ec97 | 1717 | struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
de1ede7a | 1718 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
c481ec97 | 1719 | struct ieee80211_bss *bss; |
de1ede7a JB |
1720 | int len = rx->skb->len; |
1721 | ||
1722 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1723 | return RX_CONTINUE; | |
1724 | ||
1725 | if (!rx->sta) | |
1726 | return RX_DROP_MONITOR; | |
1727 | ||
1728 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1729 | return RX_DROP_MONITOR; | |
1730 | ||
97ebe12a JM |
1731 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1732 | return RX_DROP_MONITOR; | |
1733 | ||
de1ede7a JB |
1734 | /* all categories we currently handle have action_code */ |
1735 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1736 | return RX_DROP_MONITOR; | |
1737 | ||
de1ede7a JB |
1738 | switch (mgmt->u.action.category) { |
1739 | case WLAN_CATEGORY_BACK: | |
1740 | switch (mgmt->u.action.u.addba_req.action_code) { | |
1741 | case WLAN_ACTION_ADDBA_REQ: | |
1742 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1743 | sizeof(mgmt->u.action.u.addba_req))) | |
1744 | return RX_DROP_MONITOR; | |
1745 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1746 | break; | |
1747 | case WLAN_ACTION_ADDBA_RESP: | |
1748 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1749 | sizeof(mgmt->u.action.u.addba_resp))) | |
1750 | return RX_DROP_MONITOR; | |
1751 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1752 | break; | |
1753 | case WLAN_ACTION_DELBA: | |
1754 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1755 | sizeof(mgmt->u.action.u.delba))) | |
1756 | return RX_DROP_MONITOR; | |
1757 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1758 | break; | |
1759 | } | |
39192c0b JB |
1760 | break; |
1761 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1762 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1763 | return RX_DROP_MONITOR; | |
1764 | switch (mgmt->u.action.u.measurement.action_code) { | |
1765 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1766 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1767 | sizeof(mgmt->u.action.u.measurement))) | |
1768 | return RX_DROP_MONITOR; | |
1769 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1770 | break; | |
c481ec97 S |
1771 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1772 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1773 | sizeof(mgmt->u.action.u.chan_switch))) | |
1774 | return RX_DROP_MONITOR; | |
1775 | ||
1776 | if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0) | |
1777 | return RX_DROP_MONITOR; | |
1778 | ||
1779 | bss = ieee80211_rx_bss_get(local, ifsta->bssid, | |
1780 | local->hw.conf.channel->center_freq, | |
1781 | ifsta->ssid, ifsta->ssid_len); | |
1782 | if (!bss) | |
1783 | return RX_DROP_MONITOR; | |
1784 | ||
1785 | ieee80211_process_chanswitch(sdata, | |
1786 | &mgmt->u.action.u.chan_switch.sw_elem, bss); | |
1787 | ieee80211_rx_bss_put(local, bss); | |
1788 | break; | |
39192c0b JB |
1789 | } |
1790 | break; | |
fea14732 JM |
1791 | case WLAN_CATEGORY_SA_QUERY: |
1792 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1793 | sizeof(mgmt->u.action.u.sa_query))) | |
1794 | return RX_DROP_MONITOR; | |
1795 | switch (mgmt->u.action.u.sa_query.action) { | |
1796 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1797 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1798 | return RX_DROP_MONITOR; | |
1799 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1800 | break; | |
1801 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1802 | /* | |
1803 | * SA Query response is currently only used in AP mode | |
1804 | * and it is processed in user space. | |
1805 | */ | |
1806 | return RX_CONTINUE; | |
1807 | } | |
1808 | break; | |
39192c0b JB |
1809 | default: |
1810 | return RX_CONTINUE; | |
de1ede7a JB |
1811 | } |
1812 | ||
39192c0b JB |
1813 | rx->sta->rx_packets++; |
1814 | dev_kfree_skb(rx->skb); | |
1815 | return RX_QUEUED; | |
de1ede7a JB |
1816 | } |
1817 | ||
49461622 | 1818 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1819 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1820 | { |
759ef3eb | 1821 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1822 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1823 | |
5cf121c3 | 1824 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1825 | return RX_DROP_MONITOR; |
571ecf67 | 1826 | |
97ebe12a JM |
1827 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1828 | return RX_DROP_MONITOR; | |
1829 | ||
472dbc45 JB |
1830 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1831 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1832 | ||
05c914fe JB |
1833 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
1834 | sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
759ef3eb JB |
1835 | return RX_DROP_MONITOR; |
1836 | ||
1837 | if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME) | |
e4c26add | 1838 | return RX_DROP_MONITOR; |
f9d540ee | 1839 | |
759ef3eb | 1840 | ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
9ae54c84 | 1841 | return RX_QUEUED; |
571ecf67 JB |
1842 | } |
1843 | ||
571ecf67 JB |
1844 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1845 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1846 | struct ieee80211_rx_data *rx) |
571ecf67 | 1847 | { |
a7767f95 HH |
1848 | int keyidx; |
1849 | unsigned int hdrlen; | |
571ecf67 | 1850 | |
a7767f95 | 1851 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1852 | if (rx->skb->len >= hdrlen + 4) |
1853 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1854 | else | |
1855 | keyidx = -1; | |
1856 | ||
8944b79f | 1857 | if (!rx->sta) { |
aa0daf0e JB |
1858 | /* |
1859 | * Some hardware seem to generate incorrect Michael MIC | |
1860 | * reports; ignore them to avoid triggering countermeasures. | |
1861 | */ | |
571ecf67 JB |
1862 | goto ignore; |
1863 | } | |
1864 | ||
a7767f95 | 1865 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1866 | goto ignore; |
571ecf67 | 1867 | |
05c914fe | 1868 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1869 | /* |
1870 | * APs with pairwise keys should never receive Michael MIC | |
1871 | * errors for non-zero keyidx because these are reserved for | |
1872 | * group keys and only the AP is sending real multicast | |
1873 | * frames in the BSS. | |
1874 | */ | |
eb063c17 | 1875 | goto ignore; |
571ecf67 JB |
1876 | } |
1877 | ||
a7767f95 HH |
1878 | if (!ieee80211_is_data(hdr->frame_control) && |
1879 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1880 | goto ignore; |
571ecf67 | 1881 | |
f698d856 | 1882 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1883 | ignore: |
1884 | dev_kfree_skb(rx->skb); | |
1885 | rx->skb = NULL; | |
1886 | } | |
1887 | ||
5cf121c3 JB |
1888 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1889 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1890 | { |
1891 | struct ieee80211_sub_if_data *sdata; | |
1892 | struct ieee80211_local *local = rx->local; | |
1893 | struct ieee80211_rtap_hdr { | |
1894 | struct ieee80211_radiotap_header hdr; | |
1895 | u8 flags; | |
1896 | u8 rate; | |
1897 | __le16 chan_freq; | |
1898 | __le16 chan_flags; | |
1899 | } __attribute__ ((packed)) *rthdr; | |
1900 | struct sk_buff *skb = rx->skb, *skb2; | |
1901 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1902 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1903 | |
5cf121c3 | 1904 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1905 | goto out_free_skb; |
1906 | ||
1907 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1908 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1909 | goto out_free_skb; | |
1910 | ||
1911 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1912 | memset(rthdr, 0, sizeof(*rthdr)); | |
1913 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1914 | rthdr->hdr.it_present = | |
1915 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1916 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1917 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1918 | ||
5cf121c3 | 1919 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1920 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1921 | ||
1922 | if (status->band == IEEE80211_BAND_5GHZ) | |
1923 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1924 | IEEE80211_CHAN_5GHZ); | |
1925 | else | |
1926 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1927 | IEEE80211_CHAN_2GHZ); | |
1928 | ||
1929 | skb_set_mac_header(skb, 0); | |
1930 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1931 | skb->pkt_type = PACKET_OTHERHOST; | |
1932 | skb->protocol = htons(ETH_P_802_2); | |
1933 | ||
1934 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1935 | if (!netif_running(sdata->dev)) | |
1936 | continue; | |
1937 | ||
05c914fe | 1938 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1939 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1940 | continue; | |
1941 | ||
1942 | if (prev_dev) { | |
1943 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1944 | if (skb2) { | |
1945 | skb2->dev = prev_dev; | |
1946 | netif_rx(skb2); | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | prev_dev = sdata->dev; | |
1951 | sdata->dev->stats.rx_packets++; | |
1952 | sdata->dev->stats.rx_bytes += skb->len; | |
1953 | } | |
1954 | ||
1955 | if (prev_dev) { | |
1956 | skb->dev = prev_dev; | |
1957 | netif_rx(skb); | |
1958 | skb = NULL; | |
1959 | } else | |
1960 | goto out_free_skb; | |
1961 | ||
5cf121c3 | 1962 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1963 | return; |
1964 | ||
1965 | out_free_skb: | |
1966 | dev_kfree_skb(skb); | |
1967 | } | |
1968 | ||
571ecf67 | 1969 | |
8944b79f | 1970 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1971 | struct ieee80211_rx_data *rx, |
8944b79f | 1972 | struct sk_buff *skb) |
58905290 | 1973 | { |
58905290 JB |
1974 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1975 | ||
8944b79f JB |
1976 | rx->skb = skb; |
1977 | rx->sdata = sdata; | |
1978 | rx->dev = sdata->dev; | |
1979 | ||
e32f85f7 LCC |
1980 | #define CALL_RXH(rxh) \ |
1981 | do { \ | |
1982 | res = rxh(rx); \ | |
1983 | if (res != RX_CONTINUE) \ | |
1984 | goto rxh_done; \ | |
1985 | } while (0); | |
49461622 JB |
1986 | |
1987 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1988 | CALL_RXH(ieee80211_rx_h_check) | |
1989 | CALL_RXH(ieee80211_rx_h_decrypt) | |
1990 | CALL_RXH(ieee80211_rx_h_sta_process) | |
1991 | CALL_RXH(ieee80211_rx_h_defragment) | |
1992 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1993 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1994 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1995 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1996 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1997 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1998 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1999 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2000 | #endif |
49461622 JB |
2001 | CALL_RXH(ieee80211_rx_h_data) |
2002 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 2003 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
2004 | CALL_RXH(ieee80211_rx_h_mgmt) |
2005 | ||
2006 | #undef CALL_RXH | |
2007 | ||
2008 | rxh_done: | |
58905290 JB |
2009 | switch (res) { |
2010 | case RX_DROP_MONITOR: | |
49461622 JB |
2011 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2012 | if (rx->sta) | |
2013 | rx->sta->rx_dropped++; | |
2014 | /* fall through */ | |
2015 | case RX_CONTINUE: | |
3d30d949 MW |
2016 | ieee80211_rx_cooked_monitor(rx); |
2017 | break; | |
58905290 | 2018 | case RX_DROP_UNUSABLE: |
49461622 JB |
2019 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2020 | if (rx->sta) | |
2021 | rx->sta->rx_dropped++; | |
58905290 JB |
2022 | dev_kfree_skb(rx->skb); |
2023 | break; | |
49461622 JB |
2024 | case RX_QUEUED: |
2025 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2026 | break; | |
58905290 JB |
2027 | } |
2028 | } | |
2029 | ||
571ecf67 JB |
2030 | /* main receive path */ |
2031 | ||
23a24def | 2032 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2033 | u8 *bssid, struct ieee80211_rx_data *rx, |
23a24def JB |
2034 | struct ieee80211_hdr *hdr) |
2035 | { | |
2036 | int multicast = is_multicast_ether_addr(hdr->addr1); | |
2037 | ||
51fb61e7 | 2038 | switch (sdata->vif.type) { |
05c914fe | 2039 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2040 | if (!bssid) |
2041 | return 0; | |
2042 | if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { | |
5cf121c3 | 2043 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2044 | return 0; |
5cf121c3 | 2045 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2046 | } else if (!multicast && |
2047 | compare_ether_addr(sdata->dev->dev_addr, | |
2048 | hdr->addr1) != 0) { | |
4150c572 | 2049 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2050 | return 0; |
5cf121c3 | 2051 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2052 | } |
2053 | break; | |
05c914fe | 2054 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2055 | if (!bssid) |
2056 | return 0; | |
a7767f95 | 2057 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2058 | return 1; |
87291c02 | 2059 | } |
9d9bf77d | 2060 | else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) { |
5cf121c3 | 2061 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2062 | return 0; |
5cf121c3 | 2063 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2064 | } else if (!multicast && |
2065 | compare_ether_addr(sdata->dev->dev_addr, | |
2066 | hdr->addr1) != 0) { | |
4150c572 | 2067 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2068 | return 0; |
5cf121c3 | 2069 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2070 | } else if (!rx->sta) { |
2071 | int rate_idx; | |
2072 | if (rx->status->flag & RX_FLAG_HT) | |
2073 | rate_idx = 0; /* TODO: HT rates */ | |
2074 | else | |
2075 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2076 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2077 | BIT(rate_idx)); |
2078 | } | |
23a24def | 2079 | break; |
05c914fe | 2080 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2081 | if (!multicast && |
2082 | compare_ether_addr(sdata->dev->dev_addr, | |
2083 | hdr->addr1) != 0) { | |
2084 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2085 | return 0; | |
2086 | ||
5cf121c3 | 2087 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2088 | } |
2089 | break; | |
05c914fe JB |
2090 | case NL80211_IFTYPE_AP_VLAN: |
2091 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2092 | if (!bssid) { |
2093 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2094 | hdr->addr1)) | |
2095 | return 0; | |
2096 | } else if (!ieee80211_bssid_match(bssid, | |
2097 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2098 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2099 | return 0; |
5cf121c3 | 2100 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2101 | } |
23a24def | 2102 | break; |
05c914fe | 2103 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2104 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2105 | return 0; |
2106 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2107 | return 0; | |
2108 | break; | |
05c914fe | 2109 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2110 | /* take everything */ |
2111 | break; | |
05c914fe JB |
2112 | case NL80211_IFTYPE_UNSPECIFIED: |
2113 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2114 | /* should never get here */ |
2115 | WARN_ON(1); | |
2116 | break; | |
23a24def JB |
2117 | } |
2118 | ||
2119 | return 1; | |
2120 | } | |
2121 | ||
571ecf67 | 2122 | /* |
6368e4b1 RR |
2123 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2124 | * be called with rcu_read_lock protection. | |
571ecf67 | 2125 | */ |
71ebb4aa RR |
2126 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2127 | struct sk_buff *skb, | |
2128 | struct ieee80211_rx_status *status, | |
8318d78a | 2129 | struct ieee80211_rate *rate) |
571ecf67 JB |
2130 | { |
2131 | struct ieee80211_local *local = hw_to_local(hw); | |
2132 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2133 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2134 | struct ieee80211_rx_data rx; |
6368e4b1 | 2135 | int prepares; |
8e6f0032 JB |
2136 | struct ieee80211_sub_if_data *prev = NULL; |
2137 | struct sk_buff *skb_new; | |
2138 | u8 *bssid; | |
571ecf67 | 2139 | |
358c8d9d | 2140 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2141 | memset(&rx, 0, sizeof(rx)); |
2142 | rx.skb = skb; | |
2143 | rx.local = local; | |
2144 | ||
5cf121c3 | 2145 | rx.status = status; |
5cf121c3 | 2146 | rx.rate = rate; |
72abd81b | 2147 | |
358c8d9d | 2148 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2149 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2150 | |
8944b79f JB |
2151 | rx.sta = sta_info_get(local, hdr->addr2); |
2152 | if (rx.sta) { | |
d0709a65 JB |
2153 | rx.sdata = rx.sta->sdata; |
2154 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2155 | } |
571ecf67 | 2156 | |
571ecf67 | 2157 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2158 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2159 | return; |
571ecf67 JB |
2160 | } |
2161 | ||
c2b13452 | 2162 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2163 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2164 | |
38f3714d | 2165 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2166 | ieee80211_verify_alignment(&rx); |
38f3714d | 2167 | |
571ecf67 JB |
2168 | skb = rx.skb; |
2169 | ||
79010420 | 2170 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2171 | if (!netif_running(sdata->dev)) |
2172 | continue; | |
2173 | ||
05c914fe | 2174 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2175 | continue; |
2176 | ||
51fb61e7 | 2177 | bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
5cf121c3 | 2178 | rx.flags |= IEEE80211_RX_RA_MATCH; |
6368e4b1 | 2179 | prepares = prepare_for_handlers(sdata, bssid, &rx, hdr); |
23a24def | 2180 | |
6368e4b1 | 2181 | if (!prepares) |
23a24def | 2182 | continue; |
8e6f0032 | 2183 | |
340e11f3 JB |
2184 | /* |
2185 | * frame is destined for this interface, but if it's not | |
2186 | * also for the previous one we handle that after the | |
2187 | * loop to avoid copying the SKB once too much | |
2188 | */ | |
2189 | ||
2190 | if (!prev) { | |
2191 | prev = sdata; | |
2192 | continue; | |
8e6f0032 | 2193 | } |
340e11f3 JB |
2194 | |
2195 | /* | |
2196 | * frame was destined for the previous interface | |
2197 | * so invoke RX handlers for it | |
2198 | */ | |
2199 | ||
2200 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2201 | if (!skb_new) { | |
2202 | if (net_ratelimit()) | |
2203 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2204 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2205 | wiphy_name(local->hw.wiphy), |
2206 | prev->dev->name); | |
340e11f3 JB |
2207 | continue; |
2208 | } | |
8944b79f | 2209 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2210 | prev = sdata; |
571ecf67 | 2211 | } |
a4b7d7bd | 2212 | if (prev) |
8944b79f | 2213 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2214 | else |
8e6f0032 | 2215 | dev_kfree_skb(skb); |
571ecf67 | 2216 | } |
6368e4b1 | 2217 | |
b580781e RR |
2218 | #define SEQ_MODULO 0x1000 |
2219 | #define SEQ_MASK 0xfff | |
2220 | ||
2221 | static inline int seq_less(u16 sq1, u16 sq2) | |
2222 | { | |
c6a1fa12 | 2223 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2224 | } |
2225 | ||
2226 | static inline u16 seq_inc(u16 sq) | |
2227 | { | |
c6a1fa12 | 2228 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2229 | } |
2230 | ||
2231 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2232 | { | |
c6a1fa12 | 2233 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2234 | } |
2235 | ||
2236 | ||
71364716 RR |
2237 | /* |
2238 | * As it function blongs to Rx path it must be called with | |
2239 | * the proper rcu_read_lock protection for its flow. | |
2240 | */ | |
c6a1fa12 JB |
2241 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2242 | struct tid_ampdu_rx *tid_agg_rx, | |
2243 | struct sk_buff *skb, | |
2244 | u16 mpdu_seq_num, | |
2245 | int bar_req) | |
b580781e RR |
2246 | { |
2247 | struct ieee80211_local *local = hw_to_local(hw); | |
2248 | struct ieee80211_rx_status status; | |
2249 | u16 head_seq_num, buf_size; | |
2250 | int index; | |
8318d78a JB |
2251 | struct ieee80211_supported_band *sband; |
2252 | struct ieee80211_rate *rate; | |
b580781e RR |
2253 | |
2254 | buf_size = tid_agg_rx->buf_size; | |
2255 | head_seq_num = tid_agg_rx->head_seq_num; | |
2256 | ||
2257 | /* frame with out of date sequence number */ | |
2258 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2259 | dev_kfree_skb(skb); | |
2260 | return 1; | |
2261 | } | |
2262 | ||
2263 | /* if frame sequence number exceeds our buffering window size or | |
2264 | * block Ack Request arrived - release stored frames */ | |
2265 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2266 | /* new head to the ordering buffer */ | |
2267 | if (bar_req) | |
2268 | head_seq_num = mpdu_seq_num; | |
2269 | else | |
2270 | head_seq_num = | |
2271 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2272 | /* release stored frames up to new head to stack */ | |
2273 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2274 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2275 | tid_agg_rx->ssn) | |
2276 | % tid_agg_rx->buf_size; | |
2277 | ||
2278 | if (tid_agg_rx->reorder_buf[index]) { | |
2279 | /* release the reordered frames to stack */ | |
2280 | memcpy(&status, | |
2281 | tid_agg_rx->reorder_buf[index]->cb, | |
2282 | sizeof(status)); | |
8318d78a | 2283 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2284 | if (status.flag & RX_FLAG_HT) { |
2285 | /* TODO: HT rates */ | |
2286 | rate = sband->bitrates; | |
2287 | } else { | |
2288 | rate = &sband->bitrates | |
2289 | [status.rate_idx]; | |
2290 | } | |
b580781e RR |
2291 | __ieee80211_rx_handle_packet(hw, |
2292 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2293 | &status, rate); |
b580781e RR |
2294 | tid_agg_rx->stored_mpdu_num--; |
2295 | tid_agg_rx->reorder_buf[index] = NULL; | |
2296 | } | |
2297 | tid_agg_rx->head_seq_num = | |
2298 | seq_inc(tid_agg_rx->head_seq_num); | |
2299 | } | |
2300 | if (bar_req) | |
2301 | return 1; | |
2302 | } | |
2303 | ||
2304 | /* now the new frame is always in the range of the reordering */ | |
2305 | /* buffer window */ | |
2306 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2307 | % tid_agg_rx->buf_size; | |
2308 | /* check if we already stored this frame */ | |
2309 | if (tid_agg_rx->reorder_buf[index]) { | |
2310 | dev_kfree_skb(skb); | |
2311 | return 1; | |
2312 | } | |
2313 | ||
2314 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2315 | /* release it immediately */ | |
2316 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2317 | tid_agg_rx->stored_mpdu_num == 0) { | |
2318 | tid_agg_rx->head_seq_num = | |
2319 | seq_inc(tid_agg_rx->head_seq_num); | |
2320 | return 0; | |
2321 | } | |
2322 | ||
2323 | /* put the frame in the reordering buffer */ | |
2324 | tid_agg_rx->reorder_buf[index] = skb; | |
2325 | tid_agg_rx->stored_mpdu_num++; | |
2326 | /* release the buffer until next missing frame */ | |
2327 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2328 | % tid_agg_rx->buf_size; | |
2329 | while (tid_agg_rx->reorder_buf[index]) { | |
2330 | /* release the reordered frame back to stack */ | |
2331 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2332 | sizeof(status)); | |
8318d78a | 2333 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2334 | if (status.flag & RX_FLAG_HT) |
2335 | rate = sband->bitrates; /* TODO: HT rates */ | |
2336 | else | |
2337 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2338 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2339 | &status, rate); |
b580781e RR |
2340 | tid_agg_rx->stored_mpdu_num--; |
2341 | tid_agg_rx->reorder_buf[index] = NULL; | |
2342 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2343 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2344 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2345 | } | |
2346 | return 1; | |
2347 | } | |
2348 | ||
71ebb4aa RR |
2349 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2350 | struct sk_buff *skb) | |
b580781e RR |
2351 | { |
2352 | struct ieee80211_hw *hw = &local->hw; | |
2353 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2354 | struct sta_info *sta; | |
2355 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2356 | u16 sc; |
b580781e | 2357 | u16 mpdu_seq_num; |
182503ab | 2358 | u8 ret = 0; |
b580781e RR |
2359 | int tid; |
2360 | ||
2361 | sta = sta_info_get(local, hdr->addr2); | |
2362 | if (!sta) | |
2363 | return ret; | |
2364 | ||
b580781e RR |
2365 | /* filter the QoS data rx stream according to |
2366 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2367 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2368 | goto end_reorder; |
2369 | ||
238f74a2 | 2370 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2371 | |
cee24a3e | 2372 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2373 | goto end_reorder; |
2374 | ||
cee24a3e RR |
2375 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2376 | ||
2560b6e2 EG |
2377 | /* qos null data frames are excluded */ |
2378 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2379 | goto end_reorder; |
2380 | ||
2381 | /* new un-ordered ampdu frame - process it */ | |
2382 | ||
2383 | /* reset session timer */ | |
2384 | if (tid_agg_rx->timeout) { | |
2385 | unsigned long expires = | |
2386 | jiffies + (tid_agg_rx->timeout / 1000) * HZ; | |
2387 | mod_timer(&tid_agg_rx->session_timer, expires); | |
2388 | } | |
2389 | ||
2390 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2391 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2392 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2393 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2394 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2395 | ret = 1; | |
2396 | goto end_reorder; | |
2397 | } | |
2398 | ||
2399 | /* according to mpdu sequence number deal with reordering buffer */ | |
2400 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2401 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2402 | mpdu_seq_num, 0); | |
d0709a65 | 2403 | end_reorder: |
b580781e RR |
2404 | return ret; |
2405 | } | |
2406 | ||
6368e4b1 RR |
2407 | /* |
2408 | * This is the receive path handler. It is called by a low level driver when an | |
2409 | * 802.11 MPDU is received from the hardware. | |
2410 | */ | |
2411 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2412 | struct ieee80211_rx_status *status) | |
2413 | { | |
2414 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2415 | struct ieee80211_rate *rate = NULL; |
2416 | struct ieee80211_supported_band *sband; | |
2417 | ||
2418 | if (status->band < 0 || | |
13d8fd2d | 2419 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2420 | WARN_ON(1); |
2421 | return; | |
2422 | } | |
2423 | ||
2424 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2425 | if (!sband) { |
8318d78a JB |
2426 | WARN_ON(1); |
2427 | return; | |
2428 | } | |
2429 | ||
0fb8ca45 JM |
2430 | if (status->flag & RX_FLAG_HT) { |
2431 | /* rate_idx is MCS index */ | |
2432 | if (WARN_ON(status->rate_idx < 0 || | |
2433 | status->rate_idx >= 76)) | |
2434 | return; | |
2435 | /* HT rates are not in the table - use the highest legacy rate | |
2436 | * for now since other parts of mac80211 may not yet be fully | |
2437 | * MCS aware. */ | |
2438 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2439 | } else { | |
2440 | if (WARN_ON(status->rate_idx < 0 || | |
2441 | status->rate_idx >= sband->n_bitrates)) | |
2442 | return; | |
2443 | rate = &sband->bitrates[status->rate_idx]; | |
2444 | } | |
6368e4b1 RR |
2445 | |
2446 | /* | |
2447 | * key references and virtual interfaces are protected using RCU | |
2448 | * and this requires that we are in a read-side RCU section during | |
2449 | * receive processing | |
2450 | */ | |
2451 | rcu_read_lock(); | |
2452 | ||
2453 | /* | |
2454 | * Frames with failed FCS/PLCP checksum are not returned, | |
2455 | * all other frames are returned without radiotap header | |
2456 | * if it was previously present. | |
2457 | * Also, frames with less than 16 bytes are dropped. | |
2458 | */ | |
8318d78a | 2459 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2460 | if (!skb) { |
2461 | rcu_read_unlock(); | |
2462 | return; | |
2463 | } | |
2464 | ||
b580781e | 2465 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2466 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2467 | |
2468 | rcu_read_unlock(); | |
2469 | } | |
571ecf67 JB |
2470 | EXPORT_SYMBOL(__ieee80211_rx); |
2471 | ||
2472 | /* This is a version of the rx handler that can be called from hard irq | |
2473 | * context. Post the skb on the queue and schedule the tasklet */ | |
2474 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2475 | struct ieee80211_rx_status *status) | |
2476 | { | |
2477 | struct ieee80211_local *local = hw_to_local(hw); | |
2478 | ||
2479 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2480 | ||
2481 | skb->dev = local->mdev; | |
2482 | /* copy status into skb->cb for use by tasklet */ | |
2483 | memcpy(skb->cb, status, sizeof(*status)); | |
2484 | skb->pkt_type = IEEE80211_RX_MSG; | |
2485 | skb_queue_tail(&local->skb_queue, skb); | |
2486 | tasklet_schedule(&local->tasklet); | |
2487 | } | |
2488 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |