Commit | Line | Data |
---|---|---|
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" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "led.h" |
33b64eb2 | 24 | #include "mesh.h" |
571ecf67 JB |
25 | #include "wep.h" |
26 | #include "wpa.h" | |
27 | #include "tkip.h" | |
28 | #include "wme.h" | |
29 | ||
c6a1fa12 JB |
30 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
31 | struct tid_ampdu_rx *tid_agg_rx, | |
32 | struct sk_buff *skb, | |
b3631286 | 33 | struct ieee80211_rx_status *status, |
c6a1fa12 JB |
34 | u16 mpdu_seq_num, |
35 | int bar_req); | |
b2e7771e JB |
36 | /* |
37 | * monitor mode reception | |
38 | * | |
39 | * This function cleans up the SKB, i.e. it removes all the stuff | |
40 | * only useful for monitoring. | |
41 | */ | |
42 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
43 | struct sk_buff *skb, | |
44 | int rtap_len) | |
45 | { | |
46 | skb_pull(skb, rtap_len); | |
47 | ||
48 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
49 | if (likely(skb->len > FCS_LEN)) | |
50 | skb_trim(skb, skb->len - FCS_LEN); | |
51 | else { | |
52 | /* driver bug */ | |
53 | WARN_ON(1); | |
54 | dev_kfree_skb(skb); | |
55 | skb = NULL; | |
56 | } | |
57 | } | |
58 | ||
59 | return skb; | |
60 | } | |
61 | ||
62 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
63 | struct sk_buff *skb, | |
64 | int present_fcs_len, | |
65 | int radiotap_len) | |
66 | { | |
182503ab | 67 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
68 | |
69 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
70 | return 1; | |
71 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
72 | return 1; | |
87228f57 HH |
73 | if (ieee80211_is_ctl(hdr->frame_control) && |
74 | !ieee80211_is_pspoll(hdr->frame_control) && | |
75 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
76 | return 1; |
77 | return 0; | |
78 | } | |
79 | ||
601ae7f2 BR |
80 | static int |
81 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
82 | struct ieee80211_rx_status *status) | |
83 | { | |
84 | int len; | |
85 | ||
86 | /* always present fields */ | |
87 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
88 | ||
89 | if (status->flag & RX_FLAG_TSFT) | |
90 | len += 8; | |
7fee5372 | 91 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
92 | len += 1; |
93 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
94 | len += 1; | |
95 | ||
96 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
97 | len++; | |
98 | ||
99 | /* make sure radiotap starts at a naturally aligned address */ | |
100 | if (len % 8) | |
101 | len = roundup(len, 8); | |
102 | ||
103 | return len; | |
104 | } | |
105 | ||
d1c3a37c | 106 | /* |
601ae7f2 BR |
107 | * ieee80211_add_rx_radiotap_header - add radiotap header |
108 | * | |
109 | * add a radiotap header containing all the fields which the hardware provided. | |
110 | */ | |
111 | static void | |
112 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
113 | struct sk_buff *skb, | |
114 | struct ieee80211_rx_status *status, | |
115 | struct ieee80211_rate *rate, | |
116 | int rtap_len) | |
117 | { | |
118 | struct ieee80211_radiotap_header *rthdr; | |
119 | unsigned char *pos; | |
120 | ||
121 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
122 | memset(rthdr, 0, rtap_len); | |
123 | ||
124 | /* radiotap header, set always present flags */ | |
125 | rthdr->it_present = | |
126 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
127 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
128 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
129 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
130 | rthdr->it_len = cpu_to_le16(rtap_len); | |
131 | ||
132 | pos = (unsigned char *)(rthdr+1); | |
133 | ||
134 | /* the order of the following fields is important */ | |
135 | ||
136 | /* IEEE80211_RADIOTAP_TSFT */ | |
137 | if (status->flag & RX_FLAG_TSFT) { | |
138 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
139 | rthdr->it_present |= | |
140 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
141 | pos += 8; | |
142 | } | |
143 | ||
144 | /* IEEE80211_RADIOTAP_FLAGS */ | |
145 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
146 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
147 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
148 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
149 | if (status->flag & RX_FLAG_SHORTPRE) |
150 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
151 | pos++; |
152 | ||
153 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
154 | if (status->flag & RX_FLAG_HT) { |
155 | /* | |
156 | * TODO: add following information into radiotap header once | |
157 | * suitable fields are defined for it: | |
158 | * - MCS index (status->rate_idx) | |
159 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
160 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
161 | */ | |
162 | *pos = 0; | |
8d6f658e | 163 | } else { |
ebe6c7ba | 164 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 165 | *pos = rate->bitrate / 5; |
8d6f658e | 166 | } |
601ae7f2 BR |
167 | pos++; |
168 | ||
169 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
170 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
171 | pos += 2; | |
172 | if (status->band == IEEE80211_BAND_5GHZ) | |
173 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
174 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
175 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
176 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
177 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 178 | else |
9deb1ae5 | 179 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
180 | IEEE80211_CHAN_2GHZ); |
181 | pos += 2; | |
182 | ||
183 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
184 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
185 | *pos = status->signal; | |
186 | rthdr->it_present |= | |
187 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
188 | pos++; | |
189 | } | |
190 | ||
191 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
192 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
193 | *pos = status->noise; | |
194 | rthdr->it_present |= | |
195 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
196 | pos++; | |
197 | } | |
198 | ||
199 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
200 | ||
201 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
202 | *pos = status->antenna; | |
203 | pos++; | |
204 | ||
601ae7f2 BR |
205 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
206 | ||
207 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
208 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
209 | if ((pos - (unsigned char *)rthdr) & 1) | |
210 | pos++; | |
aae89831 JB |
211 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
212 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP); | |
601ae7f2 BR |
213 | pos += 2; |
214 | } | |
215 | ||
b2e7771e JB |
216 | /* |
217 | * This function copies a received frame to all monitor interfaces and | |
218 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
219 | * radiotap header the driver might have added. | |
220 | */ | |
221 | static struct sk_buff * | |
222 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
223 | struct ieee80211_rx_status *status, |
224 | struct ieee80211_rate *rate) | |
b2e7771e JB |
225 | { |
226 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 227 | int needed_headroom = 0; |
b2e7771e JB |
228 | struct sk_buff *skb, *skb2; |
229 | struct net_device *prev_dev = NULL; | |
230 | int present_fcs_len = 0; | |
231 | int rtap_len = 0; | |
232 | ||
233 | /* | |
234 | * First, we may need to make a copy of the skb because | |
235 | * (1) we need to modify it for radiotap (if not present), and | |
236 | * (2) the other RX handlers will modify the skb we got. | |
237 | * | |
238 | * We don't need to, of course, if we aren't going to return | |
239 | * the SKB because it has a bad FCS/PLCP checksum. | |
240 | */ | |
241 | if (status->flag & RX_FLAG_RADIOTAP) | |
242 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
243 | else | |
601ae7f2 BR |
244 | /* room for the radiotap header based on driver features */ |
245 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
246 | |
247 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
248 | present_fcs_len = FCS_LEN; | |
249 | ||
250 | if (!local->monitors) { | |
251 | if (should_drop_frame(status, origskb, present_fcs_len, | |
252 | rtap_len)) { | |
253 | dev_kfree_skb(origskb); | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | return remove_monitor_info(local, origskb, rtap_len); | |
258 | } | |
259 | ||
260 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
261 | /* only need to expand headroom if necessary */ | |
262 | skb = origskb; | |
263 | origskb = NULL; | |
264 | ||
265 | /* | |
266 | * This shouldn't trigger often because most devices have an | |
267 | * RX header they pull before we get here, and that should | |
268 | * be big enough for our radiotap information. We should | |
269 | * probably export the length to drivers so that we can have | |
270 | * them allocate enough headroom to start with. | |
271 | */ | |
272 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 273 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
274 | dev_kfree_skb(skb); |
275 | return NULL; | |
276 | } | |
277 | } else { | |
278 | /* | |
279 | * Need to make a copy and possibly remove radiotap header | |
280 | * and FCS from the original. | |
281 | */ | |
282 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
283 | ||
284 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
285 | ||
286 | if (!skb) | |
287 | return origskb; | |
288 | } | |
289 | ||
290 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
291 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
292 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
293 | needed_headroom); | |
b2e7771e | 294 | |
ce3edf6d | 295 | skb_reset_mac_header(skb); |
b2e7771e JB |
296 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
297 | skb->pkt_type = PACKET_OTHERHOST; | |
298 | skb->protocol = htons(ETH_P_802_2); | |
299 | ||
300 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
301 | if (!netif_running(sdata->dev)) | |
302 | continue; | |
303 | ||
05c914fe | 304 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
305 | continue; |
306 | ||
3d30d949 MW |
307 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
308 | continue; | |
309 | ||
b2e7771e JB |
310 | if (prev_dev) { |
311 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
312 | if (skb2) { | |
313 | skb2->dev = prev_dev; | |
314 | netif_rx(skb2); | |
315 | } | |
316 | } | |
317 | ||
318 | prev_dev = sdata->dev; | |
319 | sdata->dev->stats.rx_packets++; | |
320 | sdata->dev->stats.rx_bytes += skb->len; | |
321 | } | |
322 | ||
323 | if (prev_dev) { | |
324 | skb->dev = prev_dev; | |
325 | netif_rx(skb); | |
326 | } else | |
327 | dev_kfree_skb(skb); | |
328 | ||
329 | return origskb; | |
330 | } | |
331 | ||
332 | ||
5cf121c3 | 333 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 334 | { |
238f74a2 | 335 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
336 | int tid; |
337 | ||
338 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
339 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
340 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 341 | /* frame has qos control */ |
238f74a2 HH |
342 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
343 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 344 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 345 | else |
5cf121c3 | 346 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 347 | } else { |
1411f9b5 JB |
348 | /* |
349 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
350 | * | |
351 | * Sequence numbers for management frames, QoS data | |
352 | * frames with a broadcast/multicast address in the | |
353 | * Address 1 field, and all non-QoS data frames sent | |
354 | * by QoS STAs are assigned using an additional single | |
355 | * modulo-4096 counter, [...] | |
356 | * | |
357 | * We also use that counter for non-QoS STAs. | |
358 | */ | |
359 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 360 | } |
52865dfd | 361 | |
5cf121c3 | 362 | rx->queue = tid; |
6e0d114d JB |
363 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
364 | * For now, set skb->priority to 0 for other cases. */ | |
365 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 366 | } |
6e0d114d | 367 | |
d1c3a37c JB |
368 | /** |
369 | * DOC: Packet alignment | |
370 | * | |
371 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
372 | * to the stack. | |
373 | * | |
374 | * Additionally, should, if possible, align the payload data in a way that | |
375 | * guarantees that the contained IP header is aligned to a four-byte | |
376 | * boundary. In the case of regular frames, this simply means aligning the | |
377 | * payload to a four-byte boundary (because either the IP header is directly | |
378 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
379 | * in front of it). | |
380 | * | |
381 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
382 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
383 | * push the IP header further back to a multiple of four again. Thankfully, the | |
384 | * specs were sane enough this time around to require padding each A-MSDU | |
385 | * subframe to a length that is a multiple of four. | |
386 | * | |
387 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
388 | * the payload is not supported, the driver is required to move the 802.11 | |
389 | * header to be directly in front of the payload in that case. | |
390 | */ | |
391 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 392 | { |
a7767f95 | 393 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
394 | int hdrlen; |
395 | ||
d1c3a37c JB |
396 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
397 | return; | |
398 | #endif | |
399 | ||
400 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
401 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
402 | return; | |
403 | ||
a7767f95 | 404 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
405 | return; |
406 | ||
a7767f95 | 407 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 408 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 409 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
410 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
411 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
412 | } |
413 | ||
6368e4b1 | 414 | |
571ecf67 JB |
415 | /* rx handlers */ |
416 | ||
49461622 | 417 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 418 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
419 | { |
420 | struct ieee80211_local *local = rx->local; | |
421 | struct sk_buff *skb = rx->skb; | |
422 | ||
c2b13452 JB |
423 | if (unlikely(local->hw_scanning)) |
424 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 425 | |
c2b13452 | 426 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 427 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 428 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 429 | != RX_QUEUED) |
ece8eddd | 430 | dev_kfree_skb(skb); |
9ae54c84 | 431 | return RX_QUEUED; |
571ecf67 JB |
432 | } |
433 | ||
5cf121c3 | 434 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
435 | /* scanning finished during invoking of handlers */ |
436 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 437 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
438 | } |
439 | ||
9ae54c84 | 440 | return RX_CONTINUE; |
571ecf67 JB |
441 | } |
442 | ||
3cfcf6ac JM |
443 | |
444 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
445 | { | |
446 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
447 | ||
448 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
449 | return 0; | |
450 | ||
451 | return ieee80211_is_robust_mgmt_frame(hdr); | |
452 | } | |
453 | ||
454 | ||
455 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
456 | { | |
457 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
458 | ||
459 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
460 | return 0; | |
461 | ||
462 | return ieee80211_is_robust_mgmt_frame(hdr); | |
463 | } | |
464 | ||
465 | ||
466 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
467 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
468 | { | |
469 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
470 | struct ieee80211_mmie *mmie; | |
471 | ||
472 | if (skb->len < 24 + sizeof(*mmie) || | |
473 | !is_multicast_ether_addr(hdr->da)) | |
474 | return -1; | |
475 | ||
476 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
477 | return -1; /* not a robust management frame */ | |
478 | ||
479 | mmie = (struct ieee80211_mmie *) | |
480 | (skb->data + skb->len - sizeof(*mmie)); | |
481 | if (mmie->element_id != WLAN_EID_MMIE || | |
482 | mmie->length != sizeof(*mmie) - 2) | |
483 | return -1; | |
484 | ||
485 | return le16_to_cpu(mmie->key_id); | |
486 | } | |
487 | ||
488 | ||
33b64eb2 | 489 | static ieee80211_rx_result |
5cf121c3 | 490 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 491 | { |
a7767f95 HH |
492 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
493 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 494 | |
a7767f95 HH |
495 | if (ieee80211_is_data(hdr->frame_control)) { |
496 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
497 | return RX_DROP_MONITOR; |
498 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
499 | return RX_DROP_MONITOR; | |
500 | } | |
501 | ||
502 | /* If there is not an established peer link and this is not a peer link | |
503 | * establisment frame, beacon or probe, drop the frame. | |
504 | */ | |
505 | ||
b4e08ea1 | 506 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 507 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 508 | |
a7767f95 | 509 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
510 | return RX_DROP_MONITOR; |
511 | ||
a7767f95 | 512 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
513 | mgmt = (struct ieee80211_mgmt *)hdr; |
514 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
515 | return RX_DROP_MONITOR; | |
33b64eb2 | 516 | return RX_CONTINUE; |
33b64eb2 LCC |
517 | } |
518 | ||
a7767f95 HH |
519 | if (ieee80211_is_probe_req(hdr->frame_control) || |
520 | ieee80211_is_probe_resp(hdr->frame_control) || | |
521 | ieee80211_is_beacon(hdr->frame_control)) | |
522 | return RX_CONTINUE; | |
523 | ||
524 | return RX_DROP_MONITOR; | |
525 | ||
526 | } | |
527 | ||
528 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
529 | ||
530 | if (ieee80211_is_data(hdr->frame_control) && | |
531 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 532 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 533 | return RX_DROP_MONITOR; |
902acc78 | 534 | #undef msh_h_get |
d6d1a5a7 | 535 | |
902acc78 JB |
536 | return RX_CONTINUE; |
537 | } | |
33b64eb2 LCC |
538 | |
539 | ||
49461622 | 540 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 541 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 542 | { |
a7767f95 | 543 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
544 | |
545 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
546 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 547 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 548 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 549 | hdr->seq_ctrl)) { |
5cf121c3 | 550 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
551 | rx->local->dot11FrameDuplicateCount++; |
552 | rx->sta->num_duplicates++; | |
553 | } | |
e4c26add | 554 | return RX_DROP_MONITOR; |
571ecf67 | 555 | } else |
5cf121c3 | 556 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
557 | } |
558 | ||
571ecf67 JB |
559 | if (unlikely(rx->skb->len < 16)) { |
560 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 561 | return RX_DROP_MONITOR; |
571ecf67 JB |
562 | } |
563 | ||
571ecf67 JB |
564 | /* Drop disallowed frame classes based on STA auth/assoc state; |
565 | * IEEE 802.11, Chap 5.5. | |
566 | * | |
ccd7b362 JB |
567 | * mac80211 filters only based on association state, i.e. it drops |
568 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
569 | * deauth/disassoc frames when needed. In addition, hostapd is |
570 | * responsible for filtering on both auth and assoc states. | |
571 | */ | |
33b64eb2 | 572 | |
902acc78 | 573 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 574 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 575 | |
a7767f95 HH |
576 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
577 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 578 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 579 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
580 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
581 | !ieee80211_has_tods(hdr->frame_control) && | |
582 | ieee80211_is_data(hdr->frame_control)) || | |
583 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
584 | /* Drop IBSS frames and frames for other hosts |
585 | * silently. */ | |
e4c26add | 586 | return RX_DROP_MONITOR; |
571ecf67 JB |
587 | } |
588 | ||
e4c26add | 589 | return RX_DROP_MONITOR; |
571ecf67 JB |
590 | } |
591 | ||
9ae54c84 | 592 | return RX_CONTINUE; |
570bd537 JB |
593 | } |
594 | ||
595 | ||
49461622 | 596 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 597 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 598 | { |
a7767f95 | 599 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
600 | int keyidx; |
601 | int hdrlen; | |
e4c26add | 602 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 603 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 604 | int mmie_keyidx = -1; |
570bd537 | 605 | |
3017b80b JB |
606 | /* |
607 | * Key selection 101 | |
608 | * | |
3cfcf6ac | 609 | * There are four types of keys: |
3017b80b | 610 | * - GTK (group keys) |
3cfcf6ac | 611 | * - IGTK (group keys for management frames) |
3017b80b JB |
612 | * - PTK (pairwise keys) |
613 | * - STK (station-to-station pairwise keys) | |
614 | * | |
615 | * When selecting a key, we have to distinguish between multicast | |
616 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
617 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
618 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
619 | * unicast frames can also use key indices like GTKs. Hence, if we | |
620 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 621 | * |
8dc06a1c JB |
622 | * Note that in a regular BSS, multicast frames are sent by the |
623 | * AP only, associated stations unicast the frame to the AP first | |
624 | * which then multicasts it on their behalf. | |
625 | * | |
3017b80b JB |
626 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
627 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
628 | * The spec seems to expect that one negotiates the same key with |
629 | * every station but there's no such requirement; VLANs could be | |
630 | * possible. | |
3017b80b JB |
631 | */ |
632 | ||
3017b80b | 633 | /* |
1990af8d | 634 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
635 | * addressed to us nor a multicast frame. |
636 | */ | |
5cf121c3 | 637 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 638 | return RX_CONTINUE; |
3017b80b | 639 | |
d4e46a3d JB |
640 | if (rx->sta) |
641 | stakey = rcu_dereference(rx->sta->key); | |
642 | ||
0c7c10c7 JM |
643 | if (!ieee80211_has_protected(hdr->frame_control)) |
644 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
645 | ||
d4e46a3d JB |
646 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
647 | rx->key = stakey; | |
0c7c10c7 JM |
648 | /* Skip decryption if the frame is not protected. */ |
649 | if (!ieee80211_has_protected(hdr->frame_control)) | |
650 | return RX_CONTINUE; | |
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]); | |
0c7c10c7 JM |
661 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
662 | /* | |
663 | * The frame was not protected, so skip decryption. However, we | |
664 | * need to set rx->key if there is a key that could have been | |
665 | * used so that the frame may be dropped if encryption would | |
666 | * have been expected. | |
667 | */ | |
668 | struct ieee80211_key *key = NULL; | |
669 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
670 | is_multicast_ether_addr(hdr->addr1) && | |
671 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) | |
672 | rx->key = key; | |
673 | else if ((key = rcu_dereference(rx->sdata->default_key))) | |
674 | rx->key = key; | |
675 | return RX_CONTINUE; | |
571ecf67 | 676 | } else { |
3017b80b JB |
677 | /* |
678 | * The device doesn't give us the IV so we won't be | |
679 | * able to look up the key. That's ok though, we | |
680 | * don't need to decrypt the frame, we just won't | |
681 | * be able to keep statistics accurate. | |
682 | * Except for key threshold notifications, should | |
683 | * we somehow allow the driver to tell us which key | |
684 | * the hardware used if this flag is set? | |
685 | */ | |
5cf121c3 JB |
686 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
687 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 688 | return RX_CONTINUE; |
3017b80b | 689 | |
a7767f95 | 690 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
691 | |
692 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 693 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
694 | |
695 | /* | |
696 | * no need to call ieee80211_wep_get_keyidx, | |
697 | * it verifies a bunch of things we've done already | |
698 | */ | |
699 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
700 | ||
d4e46a3d | 701 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
702 | |
703 | /* | |
704 | * RSNA-protected unicast frames should always be sent with | |
705 | * pairwise or station-to-station keys, but for WEP we allow | |
706 | * using a key index as well. | |
707 | */ | |
8f20fc24 | 708 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
709 | !is_multicast_ether_addr(hdr->addr1)) |
710 | rx->key = NULL; | |
571ecf67 JB |
711 | } |
712 | ||
3017b80b | 713 | if (rx->key) { |
571ecf67 | 714 | rx->key->tx_rx_count++; |
011bfcc4 | 715 | /* TODO: add threshold stuff again */ |
1990af8d | 716 | } else { |
e4c26add | 717 | return RX_DROP_MONITOR; |
70f08765 JB |
718 | } |
719 | ||
1990af8d JB |
720 | /* Check for weak IVs if possible */ |
721 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 722 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
723 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
724 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
725 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
726 | rx->sta->wep_weak_iv_count++; | |
727 | ||
70f08765 JB |
728 | switch (rx->key->conf.alg) { |
729 | case ALG_WEP: | |
e2f036da MN |
730 | result = ieee80211_crypto_wep_decrypt(rx); |
731 | break; | |
70f08765 | 732 | case ALG_TKIP: |
e2f036da MN |
733 | result = ieee80211_crypto_tkip_decrypt(rx); |
734 | break; | |
70f08765 | 735 | case ALG_CCMP: |
e2f036da MN |
736 | result = ieee80211_crypto_ccmp_decrypt(rx); |
737 | break; | |
3cfcf6ac JM |
738 | case ALG_AES_CMAC: |
739 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
740 | break; | |
70f08765 JB |
741 | } |
742 | ||
e2f036da | 743 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 744 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
745 | |
746 | return result; | |
70f08765 JB |
747 | } |
748 | ||
572e0012 KV |
749 | static ieee80211_rx_result debug_noinline |
750 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
751 | { | |
752 | struct ieee80211_local *local; | |
753 | struct ieee80211_hdr *hdr; | |
754 | struct sk_buff *skb; | |
755 | ||
756 | local = rx->local; | |
757 | skb = rx->skb; | |
758 | hdr = (struct ieee80211_hdr *) skb->data; | |
759 | ||
760 | if (!local->pspolling) | |
761 | return RX_CONTINUE; | |
762 | ||
763 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
764 | /* this is not from AP */ | |
765 | return RX_CONTINUE; | |
766 | ||
767 | if (!ieee80211_is_data(hdr->frame_control)) | |
768 | return RX_CONTINUE; | |
769 | ||
770 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
771 | /* AP has no more frames buffered for us */ | |
772 | local->pspolling = false; | |
773 | return RX_CONTINUE; | |
774 | } | |
775 | ||
776 | /* more data bit is set, let's request a new frame from the AP */ | |
777 | ieee80211_send_pspoll(local, rx->sdata); | |
778 | ||
779 | return RX_CONTINUE; | |
780 | } | |
781 | ||
133b8226 | 782 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 783 | { |
133b8226 | 784 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 785 | struct ieee80211_local *local = sdata->local; |
0795af57 | 786 | |
3e122be0 | 787 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 788 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
24487981 | 789 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
571ecf67 | 790 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
791 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
792 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
793 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
794 | } | |
795 | ||
133b8226 | 796 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 797 | { |
133b8226 JB |
798 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
799 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
800 | struct sk_buff *skb; |
801 | int sent = 0; | |
571ecf67 | 802 | |
3e122be0 | 803 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 804 | |
07346f81 | 805 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
24487981 | 806 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta); |
004c872e JB |
807 | |
808 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
809 | sta_info_clear_tim_bit(sta); | |
810 | ||
571ecf67 | 811 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
812 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
813 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 814 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 815 | |
571ecf67 JB |
816 | /* Send all buffered frames to the station */ |
817 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 818 | sent++; |
8b30b1fe | 819 | skb->requeue = 1; |
571ecf67 JB |
820 | dev_queue_xmit(skb); |
821 | } | |
822 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
823 | local->total_ps_buffered--; |
824 | sent++; | |
825 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 826 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 827 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 828 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 829 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 830 | skb->requeue = 1; |
571ecf67 JB |
831 | dev_queue_xmit(skb); |
832 | } | |
833 | ||
834 | return sent; | |
835 | } | |
836 | ||
49461622 | 837 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 838 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
839 | { |
840 | struct sta_info *sta = rx->sta; | |
a7767f95 | 841 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
842 | |
843 | if (!sta) | |
9ae54c84 | 844 | return RX_CONTINUE; |
571ecf67 JB |
845 | |
846 | /* Update last_rx only for IBSS packets which are for the current | |
847 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
848 | * other STAs are using different BSSID. */ | |
05c914fe | 849 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 850 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 851 | NL80211_IFTYPE_ADHOC); |
46900298 | 852 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 JB |
853 | sta->last_rx = jiffies; |
854 | } else | |
855 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 856 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
857 | /* Update last_rx only for unicast frames in order to prevent |
858 | * the Probe Request frames (the only broadcast frames from a | |
859 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
860 | * Mesh beacons will update last_rx when if they are found to |
861 | * match the current local configuration when processed. | |
571ecf67 | 862 | */ |
15b7b062 KV |
863 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION && |
864 | ieee80211_is_beacon(hdr->frame_control)) { | |
865 | rx->sdata->u.mgd.last_beacon = jiffies; | |
866 | } else | |
867 | sta->last_rx = jiffies; | |
571ecf67 JB |
868 | } |
869 | ||
5cf121c3 | 870 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 871 | return RX_CONTINUE; |
571ecf67 | 872 | |
3cf335d5 KV |
873 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
874 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
875 | ||
571ecf67 JB |
876 | sta->rx_fragments++; |
877 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 878 | sta->last_signal = rx->status->signal; |
566bfe5a | 879 | sta->last_qual = rx->status->qual; |
5cf121c3 | 880 | sta->last_noise = rx->status->noise; |
571ecf67 | 881 | |
72eaa43a JB |
882 | /* |
883 | * Change STA power saving mode only at the end of a frame | |
884 | * exchange sequence. | |
885 | */ | |
3e122be0 | 886 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
887 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
888 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
889 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
890 | /* | |
891 | * Ignore doze->wake transitions that are | |
892 | * indicated by non-data frames, the standard | |
893 | * is unclear here, but for example going to | |
894 | * PS mode and then scanning would cause a | |
895 | * doze->wake transition for the probe request, | |
896 | * and that is clearly undesirable. | |
897 | */ | |
898 | if (ieee80211_is_data(hdr->frame_control) && | |
899 | !ieee80211_has_pm(hdr->frame_control)) | |
900 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
901 | } else { | |
902 | if (ieee80211_has_pm(hdr->frame_control)) | |
903 | ap_sta_ps_start(sta); | |
904 | } | |
571ecf67 JB |
905 | } |
906 | ||
907 | /* Drop data::nullfunc frames silently, since they are used only to | |
908 | * control station power saving mode. */ | |
a7767f95 | 909 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
910 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
911 | /* Update counter and free packet here to avoid counting this | |
912 | * as a dropped packed. */ | |
913 | sta->rx_packets++; | |
914 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 915 | return RX_QUEUED; |
571ecf67 JB |
916 | } |
917 | ||
9ae54c84 | 918 | return RX_CONTINUE; |
571ecf67 JB |
919 | } /* ieee80211_rx_h_sta_process */ |
920 | ||
571ecf67 JB |
921 | static inline struct ieee80211_fragment_entry * |
922 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
923 | unsigned int frag, unsigned int seq, int rx_queue, | |
924 | struct sk_buff **skb) | |
925 | { | |
926 | struct ieee80211_fragment_entry *entry; | |
927 | int idx; | |
928 | ||
929 | idx = sdata->fragment_next; | |
930 | entry = &sdata->fragments[sdata->fragment_next++]; | |
931 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
932 | sdata->fragment_next = 0; | |
933 | ||
934 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 935 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
936 | struct ieee80211_hdr *hdr = |
937 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
938 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
939 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 940 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
941 | sdata->dev->name, idx, |
942 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 943 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 944 | #endif |
571ecf67 JB |
945 | __skb_queue_purge(&entry->skb_list); |
946 | } | |
947 | ||
948 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
949 | *skb = NULL; | |
950 | entry->first_frag_time = jiffies; | |
951 | entry->seq = seq; | |
952 | entry->rx_queue = rx_queue; | |
953 | entry->last_frag = frag; | |
954 | entry->ccmp = 0; | |
955 | entry->extra_len = 0; | |
956 | ||
957 | return entry; | |
958 | } | |
959 | ||
960 | static inline struct ieee80211_fragment_entry * | |
961 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 962 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
963 | int rx_queue, struct ieee80211_hdr *hdr) |
964 | { | |
965 | struct ieee80211_fragment_entry *entry; | |
966 | int i, idx; | |
967 | ||
968 | idx = sdata->fragment_next; | |
969 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
970 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
971 | |
972 | idx--; | |
973 | if (idx < 0) | |
974 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
975 | ||
976 | entry = &sdata->fragments[idx]; | |
977 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
978 | entry->rx_queue != rx_queue || | |
979 | entry->last_frag + 1 != frag) | |
980 | continue; | |
981 | ||
b73d70ad | 982 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 983 | |
b73d70ad HH |
984 | /* |
985 | * Check ftype and addresses are equal, else check next fragment | |
986 | */ | |
987 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
988 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
989 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
990 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
991 | continue; | |
992 | ||
ab46623e | 993 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
994 | __skb_queue_purge(&entry->skb_list); |
995 | continue; | |
996 | } | |
997 | return entry; | |
998 | } | |
999 | ||
1000 | return NULL; | |
1001 | } | |
1002 | ||
49461622 | 1003 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1004 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1005 | { |
1006 | struct ieee80211_hdr *hdr; | |
1007 | u16 sc; | |
358c8d9d | 1008 | __le16 fc; |
571ecf67 JB |
1009 | unsigned int frag, seq; |
1010 | struct ieee80211_fragment_entry *entry; | |
1011 | struct sk_buff *skb; | |
1012 | ||
b73d70ad | 1013 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1014 | fc = hdr->frame_control; |
571ecf67 JB |
1015 | sc = le16_to_cpu(hdr->seq_ctrl); |
1016 | frag = sc & IEEE80211_SCTL_FRAG; | |
1017 | ||
358c8d9d | 1018 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1019 | (rx->skb)->len < 24 || |
1020 | is_multicast_ether_addr(hdr->addr1))) { | |
1021 | /* not fragmented */ | |
1022 | goto out; | |
1023 | } | |
1024 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1025 | ||
1026 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1027 | ||
1028 | if (frag == 0) { | |
1029 | /* This is the first fragment of a new frame. */ | |
1030 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1031 | rx->queue, &(rx->skb)); |
8f20fc24 | 1032 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1033 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1034 | /* Store CCMP PN so that we can verify that the next |
1035 | * fragment has a sequential PN value. */ | |
1036 | entry->ccmp = 1; | |
1037 | memcpy(entry->last_pn, | |
5cf121c3 | 1038 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1039 | CCMP_PN_LEN); |
1040 | } | |
9ae54c84 | 1041 | return RX_QUEUED; |
571ecf67 JB |
1042 | } |
1043 | ||
1044 | /* This is a fragment for a frame that should already be pending in | |
1045 | * fragment cache. Add this fragment to the end of the pending entry. | |
1046 | */ | |
b73d70ad | 1047 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1048 | if (!entry) { |
1049 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1050 | return RX_DROP_MONITOR; |
571ecf67 JB |
1051 | } |
1052 | ||
1053 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1054 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1055 | if (entry->ccmp) { | |
1056 | int i; | |
1057 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1058 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1059 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1060 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1061 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1062 | pn[i]++; | |
1063 | if (pn[i]) | |
1064 | break; | |
1065 | } | |
5cf121c3 | 1066 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1067 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1068 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1069 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1070 | } | |
1071 | ||
358c8d9d | 1072 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1073 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1074 | entry->last_frag = frag; | |
1075 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1076 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1077 | rx->skb = NULL; |
9ae54c84 | 1078 | return RX_QUEUED; |
571ecf67 JB |
1079 | } |
1080 | ||
1081 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1082 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1083 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1084 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1085 | GFP_ATOMIC))) { | |
1086 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1087 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1088 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1089 | } |
1090 | } | |
1091 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1092 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1093 | dev_kfree_skb(skb); | |
1094 | } | |
1095 | ||
1096 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1097 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1098 | |
1099 | out: | |
1100 | if (rx->sta) | |
1101 | rx->sta->rx_packets++; | |
1102 | if (is_multicast_ether_addr(hdr->addr1)) | |
1103 | rx->local->dot11MulticastReceivedFrameCount++; | |
1104 | else | |
1105 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1106 | return RX_CONTINUE; |
571ecf67 JB |
1107 | } |
1108 | ||
49461622 | 1109 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1110 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1111 | { |
98f0b0a3 | 1112 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1113 | struct sk_buff *skb; |
1114 | int no_pending_pkts; | |
358c8d9d | 1115 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1116 | |
358c8d9d | 1117 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1118 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1119 | return RX_CONTINUE; |
571ecf67 | 1120 | |
05c914fe JB |
1121 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1122 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1123 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1124 | |
571ecf67 JB |
1125 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1126 | if (!skb) { | |
1127 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1128 | if (skb) | |
1129 | rx->local->total_ps_buffered--; | |
1130 | } | |
1131 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1132 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1133 | ||
1134 | if (skb) { | |
1135 | struct ieee80211_hdr *hdr = | |
1136 | (struct ieee80211_hdr *) skb->data; | |
1137 | ||
4a9a66e9 JB |
1138 | /* |
1139 | * Tell TX path to send one frame even though the STA may | |
1140 | * still remain is PS mode after this frame exchange. | |
1141 | */ | |
07346f81 | 1142 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1143 | |
1144 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1145 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1146 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1147 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1148 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1149 | ||
1150 | /* Use MoreData flag to indicate whether there are more | |
1151 | * buffered frames for this STA */ | |
836341a7 | 1152 | if (no_pending_pkts) |
571ecf67 | 1153 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1154 | else |
571ecf67 JB |
1155 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1156 | ||
1157 | dev_queue_xmit(skb); | |
1158 | ||
004c872e JB |
1159 | if (no_pending_pkts) |
1160 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1161 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1162 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1163 | /* |
1164 | * FIXME: This can be the result of a race condition between | |
1165 | * us expiring a frame and the station polling for it. | |
1166 | * Should we send it a null-func frame indicating we | |
1167 | * have nothing buffered for it? | |
1168 | */ | |
0c68ae26 | 1169 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1170 | "though there are no buffered frames for it\n", |
0c68ae26 | 1171 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1172 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1173 | } |
1174 | ||
9ae54c84 | 1175 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1176 | * count as an dropped frame. */ |
1177 | dev_kfree_skb(rx->skb); | |
1178 | ||
9ae54c84 | 1179 | return RX_QUEUED; |
571ecf67 JB |
1180 | } |
1181 | ||
49461622 | 1182 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1183 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1184 | { |
6e0d114d | 1185 | u8 *data = rx->skb->data; |
238f74a2 | 1186 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1187 | |
238f74a2 | 1188 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1189 | return RX_CONTINUE; |
6e0d114d JB |
1190 | |
1191 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1192 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1193 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1194 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1195 | /* change frame type to non QOS */ |
238f74a2 | 1196 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1197 | |
9ae54c84 | 1198 | return RX_CONTINUE; |
6e0d114d JB |
1199 | } |
1200 | ||
76ee65bf | 1201 | static int |
5cf121c3 | 1202 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1203 | { |
07346f81 | 1204 | if (unlikely(!rx->sta || |
f4ea83dd | 1205 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1206 | return -EACCES; |
571ecf67 | 1207 | |
76ee65bf | 1208 | return 0; |
571ecf67 JB |
1209 | } |
1210 | ||
76ee65bf | 1211 | static int |
358c8d9d | 1212 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1213 | { |
3017b80b | 1214 | /* |
7848ba7d JB |
1215 | * Pass through unencrypted frames if the hardware has |
1216 | * decrypted them already. | |
3017b80b | 1217 | */ |
5cf121c3 | 1218 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1219 | return 0; |
571ecf67 JB |
1220 | |
1221 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1222 | if (unlikely(!ieee80211_has_protected(fc) && |
1223 | !ieee80211_is_nullfunc(fc) && | |
f2ca3ea4 | 1224 | ieee80211_is_data(fc) && |
b3fc9c6c | 1225 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1226 | return -EACCES; |
f2ca3ea4 JM |
1227 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
1228 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1229 | rx->key)) | |
1230 | return -EACCES; | |
1231 | /* BIP does not use Protected field, so need to check MMIE */ | |
1232 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) | |
1233 | && ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
1234 | rx->key)) | |
1235 | return -EACCES; | |
1236 | /* | |
1237 | * When using MFP, Action frames are not allowed prior to | |
1238 | * having configured keys. | |
1239 | */ | |
1240 | if (unlikely(ieee80211_is_action(fc) && !rx->key && | |
1241 | ieee80211_is_robust_mgmt_frame( | |
1242 | (struct ieee80211_hdr *) rx->skb->data))) | |
1243 | return -EACCES; | |
1244 | } | |
b3fc9c6c | 1245 | |
76ee65bf | 1246 | return 0; |
571ecf67 JB |
1247 | } |
1248 | ||
76ee65bf | 1249 | static int |
e31a16d6 | 1250 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1251 | { |
1252 | struct net_device *dev = rx->dev; | |
571ecf67 JB |
1253 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1254 | ||
e31a16d6 | 1255 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
76ee65bf | 1256 | } |
571ecf67 | 1257 | |
ce3edf6d JB |
1258 | /* |
1259 | * requires that rx->skb is a frame with ethernet header | |
1260 | */ | |
358c8d9d | 1261 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1262 | { |
c97c23e3 | 1263 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1264 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1265 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1266 | ||
1267 | /* | |
1268 | * Allow EAPOL frames to us/the PAE group address regardless | |
1269 | * of whether the frame was encrypted or not. | |
1270 | */ | |
1271 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1272 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1273 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1274 | return true; | |
1275 | ||
1276 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1277 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1278 | return false; |
1279 | ||
1280 | return true; | |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * requires that rx->skb is a frame with ethernet header | |
1285 | */ | |
76ee65bf | 1286 | static void |
5cf121c3 | 1287 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1288 | { |
1289 | struct net_device *dev = rx->dev; | |
1290 | struct ieee80211_local *local = rx->local; | |
1291 | struct sk_buff *skb, *xmit_skb; | |
1292 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1293 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1294 | struct sta_info *dsta; | |
571ecf67 | 1295 | |
76ee65bf RR |
1296 | skb = rx->skb; |
1297 | xmit_skb = NULL; | |
571ecf67 | 1298 | |
05c914fe JB |
1299 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1300 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1301 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1302 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1303 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1304 | /* | |
1305 | * send multicast frames both to higher layers in | |
1306 | * local net stack and back to the wireless medium | |
1307 | */ | |
76ee65bf RR |
1308 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1309 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1310 | printk(KERN_DEBUG "%s: failed to clone " |
1311 | "multicast frame\n", dev->name); | |
1312 | } else { | |
571ecf67 | 1313 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1314 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1315 | /* |
1316 | * The destination station is associated to | |
1317 | * this AP (in this VLAN), so send the frame | |
1318 | * directly to it and do not pass it to local | |
1319 | * net stack. | |
571ecf67 | 1320 | */ |
76ee65bf | 1321 | xmit_skb = skb; |
571ecf67 JB |
1322 | skb = NULL; |
1323 | } | |
571ecf67 JB |
1324 | } |
1325 | } | |
1326 | ||
1327 | if (skb) { | |
d1c3a37c JB |
1328 | int align __maybe_unused; |
1329 | ||
1330 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1331 | /* | |
1332 | * 'align' will only take the values 0 or 2 here | |
1333 | * since all frames are required to be aligned | |
1334 | * to 2-byte boundaries when being passed to | |
1335 | * mac80211. That also explains the __skb_push() | |
1336 | * below. | |
1337 | */ | |
d1bcb9f1 | 1338 | align = (unsigned long)skb->data & 3; |
d1c3a37c JB |
1339 | if (align) { |
1340 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1341 | dev_kfree_skb(skb); | |
1342 | skb = NULL; | |
1343 | } else { | |
1344 | u8 *data = skb->data; | |
1345 | size_t len = skb->len; | |
1346 | u8 *new = __skb_push(skb, align); | |
1347 | memmove(new, data, len); | |
1348 | __skb_trim(skb, len); | |
1349 | } | |
1350 | } | |
1351 | #endif | |
1352 | ||
1353 | if (skb) { | |
1354 | /* deliver to local stack */ | |
1355 | skb->protocol = eth_type_trans(skb, dev); | |
1356 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1357 | netif_rx(skb); | |
1358 | } | |
571ecf67 JB |
1359 | } |
1360 | ||
76ee65bf | 1361 | if (xmit_skb) { |
571ecf67 | 1362 | /* send to wireless media */ |
f831e909 | 1363 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1364 | skb_reset_network_header(xmit_skb); |
1365 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1366 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1367 | } |
76ee65bf RR |
1368 | } |
1369 | ||
49461622 | 1370 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1371 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1372 | { |
1373 | struct net_device *dev = rx->dev; | |
1374 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1375 | u16 ethertype; |
fd4c7f2f RR |
1376 | u8 *payload; |
1377 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1378 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1379 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1380 | const struct ethhdr *eth; |
1381 | int remaining, err; | |
1382 | u8 dst[ETH_ALEN]; | |
1383 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1384 | |
358c8d9d | 1385 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1386 | return RX_CONTINUE; |
fd4c7f2f | 1387 | |
358c8d9d | 1388 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1389 | return RX_DROP_MONITOR; |
fd4c7f2f | 1390 | |
5cf121c3 | 1391 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1392 | return RX_CONTINUE; |
fd4c7f2f | 1393 | |
e31a16d6 | 1394 | err = __ieee80211_data_to_8023(rx); |
fd4c7f2f | 1395 | if (unlikely(err)) |
e4c26add | 1396 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1397 | |
1398 | skb->dev = dev; | |
1399 | ||
1400 | dev->stats.rx_packets++; | |
1401 | dev->stats.rx_bytes += skb->len; | |
1402 | ||
1403 | /* skip the wrapping header */ | |
1404 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1405 | if (!eth) | |
e4c26add | 1406 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1407 | |
1408 | while (skb != frame) { | |
1409 | u8 padding; | |
1410 | __be16 len = eth->h_proto; | |
1411 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1412 | ||
1413 | remaining = skb->len; | |
1414 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1415 | memcpy(src, eth->h_source, ETH_ALEN); | |
1416 | ||
1417 | padding = ((4 - subframe_len) & 0x3); | |
1418 | /* the last MSDU has no padding */ | |
f4ea83dd | 1419 | if (subframe_len > remaining) |
e4c26add | 1420 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1421 | |
1422 | skb_pull(skb, sizeof(struct ethhdr)); | |
1423 | /* if last subframe reuse skb */ | |
1424 | if (remaining <= subframe_len + padding) | |
1425 | frame = skb; | |
1426 | else { | |
d1c3a37c JB |
1427 | /* |
1428 | * Allocate and reserve two bytes more for payload | |
1429 | * alignment since sizeof(struct ethhdr) is 14. | |
1430 | */ | |
1431 | frame = dev_alloc_skb( | |
1432 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1433 | subframe_len + 2); | |
fd4c7f2f RR |
1434 | |
1435 | if (frame == NULL) | |
e4c26add | 1436 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1437 | |
d1c3a37c JB |
1438 | skb_reserve(frame, |
1439 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1440 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1441 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1442 | ntohs(len)); | |
1443 | ||
1444 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1445 | padding); | |
1446 | if (!eth) { | |
fd4c7f2f | 1447 | dev_kfree_skb(frame); |
e4c26add | 1448 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1449 | } |
1450 | } | |
1451 | ||
ce3edf6d | 1452 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1453 | frame->dev = dev; |
1454 | frame->priority = skb->priority; | |
1455 | rx->skb = frame; | |
1456 | ||
fd4c7f2f RR |
1457 | payload = frame->data; |
1458 | ethertype = (payload[6] << 8) | payload[7]; | |
1459 | ||
1460 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1461 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1462 | compare_ether_addr(payload, | |
1463 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1464 | /* remove RFC1042 or Bridge-Tunnel |
1465 | * encapsulation and replace EtherType */ | |
1466 | skb_pull(frame, 6); | |
1467 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1468 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1469 | } else { | |
ce3edf6d JB |
1470 | memcpy(skb_push(frame, sizeof(__be16)), |
1471 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1472 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1473 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1474 | } | |
1475 | ||
358c8d9d | 1476 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1477 | if (skb == frame) /* last frame */ |
e4c26add | 1478 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1479 | dev_kfree_skb(frame); |
1480 | continue; | |
1481 | } | |
fd4c7f2f RR |
1482 | |
1483 | ieee80211_deliver_skb(rx); | |
1484 | } | |
1485 | ||
9ae54c84 | 1486 | return RX_QUEUED; |
fd4c7f2f RR |
1487 | } |
1488 | ||
bf94e17b | 1489 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1490 | static ieee80211_rx_result |
e32f85f7 LCC |
1491 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1492 | { | |
1493 | struct ieee80211_hdr *hdr; | |
1494 | struct ieee80211s_hdr *mesh_hdr; | |
1495 | unsigned int hdrlen; | |
1496 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1497 | ||
1498 | hdr = (struct ieee80211_hdr *) skb->data; | |
1499 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1500 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1501 | ||
1502 | if (!ieee80211_is_data(hdr->frame_control)) | |
1503 | return RX_CONTINUE; | |
1504 | ||
1505 | if (!mesh_hdr->ttl) | |
1506 | /* illegal frame */ | |
1507 | return RX_DROP_MONITOR; | |
1508 | ||
79617dee Y |
1509 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1510 | struct ieee80211_sub_if_data *sdata; | |
1511 | struct mesh_path *mppath; | |
1512 | ||
1513 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1514 | rcu_read_lock(); | |
1515 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1516 | if (!mppath) { | |
1517 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1518 | } else { | |
1519 | spin_lock_bh(&mppath->state_lock); | |
1520 | mppath->exp_time = jiffies; | |
1521 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1522 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1523 | spin_unlock_bh(&mppath->state_lock); | |
1524 | } | |
1525 | rcu_read_unlock(); | |
1526 | } | |
1527 | ||
e32f85f7 LCC |
1528 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1529 | return RX_CONTINUE; | |
1530 | ||
1531 | mesh_hdr->ttl--; | |
1532 | ||
1533 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1534 | if (!mesh_hdr->ttl) | |
472dbc45 | 1535 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1536 | dropped_frames_ttl); |
1537 | else { | |
1538 | struct ieee80211_hdr *fwd_hdr; | |
1539 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1540 | ||
1541 | if (!fwd_skb && net_ratelimit()) | |
1542 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1543 | rx->dev->name); | |
1544 | ||
1545 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1546 | /* | |
1547 | * Save TA to addr1 to send TA a path error if a | |
1548 | * suitable next hop is not found | |
1549 | */ | |
1550 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1551 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1552 | fwd_skb->dev = rx->local->mdev; | |
1553 | fwd_skb->iif = rx->dev->ifindex; | |
1554 | dev_queue_xmit(fwd_skb); | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | if (is_multicast_ether_addr(hdr->addr3) || | |
1559 | rx->dev->flags & IFF_PROMISC) | |
1560 | return RX_CONTINUE; | |
1561 | else | |
1562 | return RX_DROP_MONITOR; | |
1563 | } | |
bf94e17b | 1564 | #endif |
e32f85f7 | 1565 | |
49461622 | 1566 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1567 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1568 | { |
1569 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1570 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1571 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1572 | int err; |
76ee65bf | 1573 | |
358c8d9d | 1574 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1575 | return RX_CONTINUE; |
76ee65bf | 1576 | |
358c8d9d | 1577 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1578 | return RX_DROP_MONITOR; |
76ee65bf | 1579 | |
e31a16d6 | 1580 | err = __ieee80211_data_to_8023(rx); |
76ee65bf | 1581 | if (unlikely(err)) |
e4c26add | 1582 | return RX_DROP_UNUSABLE; |
76ee65bf | 1583 | |
358c8d9d | 1584 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1585 | return RX_DROP_MONITOR; |
ce3edf6d | 1586 | |
76ee65bf RR |
1587 | rx->skb->dev = dev; |
1588 | ||
1589 | dev->stats.rx_packets++; | |
1590 | dev->stats.rx_bytes += rx->skb->len; | |
1591 | ||
1592 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1593 | |
9ae54c84 | 1594 | return RX_QUEUED; |
571ecf67 JB |
1595 | } |
1596 | ||
49461622 | 1597 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1598 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1599 | { |
1600 | struct ieee80211_local *local = rx->local; | |
1601 | struct ieee80211_hw *hw = &local->hw; | |
1602 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1603 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1604 | struct tid_ampdu_rx *tid_agg_rx; |
1605 | u16 start_seq_num; | |
1606 | u16 tid; | |
1607 | ||
a7767f95 | 1608 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1609 | return RX_CONTINUE; |
71364716 | 1610 | |
a7767f95 | 1611 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1612 | if (!rx->sta) |
9ae54c84 | 1613 | return RX_CONTINUE; |
71364716 | 1614 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1615 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1616 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1617 | return RX_CONTINUE; |
cee24a3e | 1618 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1619 | |
1620 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1621 | ||
1622 | /* reset session timer */ | |
20ad19d0 JB |
1623 | if (tid_agg_rx->timeout) |
1624 | mod_timer(&tid_agg_rx->session_timer, | |
1625 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1626 | |
1627 | /* manage reordering buffer according to requested */ | |
1628 | /* sequence number */ | |
1629 | rcu_read_lock(); | |
b3631286 | 1630 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, NULL, |
71364716 RR |
1631 | start_seq_num, 1); |
1632 | rcu_read_unlock(); | |
e4c26add | 1633 | return RX_DROP_UNUSABLE; |
71364716 RR |
1634 | } |
1635 | ||
9ae54c84 | 1636 | return RX_CONTINUE; |
71364716 RR |
1637 | } |
1638 | ||
f4f727a6 JM |
1639 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1640 | struct ieee80211_mgmt *mgmt, | |
1641 | size_t len) | |
fea14732 JM |
1642 | { |
1643 | struct ieee80211_local *local = sdata->local; | |
1644 | struct sk_buff *skb; | |
1645 | struct ieee80211_mgmt *resp; | |
1646 | ||
1647 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1648 | /* Not to own unicast address */ | |
1649 | return; | |
1650 | } | |
1651 | ||
46900298 JB |
1652 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1653 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
fea14732 JM |
1654 | /* Not from the current AP. */ |
1655 | return; | |
1656 | } | |
1657 | ||
46900298 | 1658 | if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) { |
fea14732 JM |
1659 | /* Association in progress; ignore SA Query */ |
1660 | return; | |
1661 | } | |
1662 | ||
1663 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1664 | /* Too short SA Query request frame */ | |
1665 | return; | |
1666 | } | |
1667 | ||
1668 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1669 | if (skb == NULL) | |
1670 | return; | |
1671 | ||
1672 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1673 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1674 | memset(resp, 0, 24); | |
1675 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1676 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1677 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1678 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1679 | IEEE80211_STYPE_ACTION); | |
1680 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1681 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1682 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1683 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1684 | mgmt->u.action.u.sa_query.trans_id, | |
1685 | WLAN_SA_QUERY_TR_ID_LEN); | |
1686 | ||
1687 | ieee80211_tx_skb(sdata, skb, 1); | |
1688 | } | |
1689 | ||
de1ede7a JB |
1690 | static ieee80211_rx_result debug_noinline |
1691 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1692 | { | |
1693 | struct ieee80211_local *local = rx->local; | |
1694 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1695 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
c481ec97 | 1696 | struct ieee80211_bss *bss; |
de1ede7a JB |
1697 | int len = rx->skb->len; |
1698 | ||
1699 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1700 | return RX_CONTINUE; | |
1701 | ||
1702 | if (!rx->sta) | |
1703 | return RX_DROP_MONITOR; | |
1704 | ||
1705 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1706 | return RX_DROP_MONITOR; | |
1707 | ||
97ebe12a JM |
1708 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1709 | return RX_DROP_MONITOR; | |
1710 | ||
de1ede7a JB |
1711 | /* all categories we currently handle have action_code */ |
1712 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1713 | return RX_DROP_MONITOR; | |
1714 | ||
de1ede7a JB |
1715 | switch (mgmt->u.action.category) { |
1716 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1717 | /* |
1718 | * The aggregation code is not prepared to handle | |
1719 | * anything but STA/AP due to the BSSID handling; | |
1720 | * IBSS could work in the code but isn't supported | |
1721 | * by drivers or the standard. | |
1722 | */ | |
1723 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1724 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1725 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1726 | return RX_DROP_MONITOR; | |
1727 | ||
de1ede7a JB |
1728 | switch (mgmt->u.action.u.addba_req.action_code) { |
1729 | case WLAN_ACTION_ADDBA_REQ: | |
1730 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1731 | sizeof(mgmt->u.action.u.addba_req))) | |
1732 | return RX_DROP_MONITOR; | |
1733 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1734 | break; | |
1735 | case WLAN_ACTION_ADDBA_RESP: | |
1736 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1737 | sizeof(mgmt->u.action.u.addba_resp))) | |
1738 | return RX_DROP_MONITOR; | |
1739 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1740 | break; | |
1741 | case WLAN_ACTION_DELBA: | |
1742 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1743 | sizeof(mgmt->u.action.u.delba))) | |
1744 | return RX_DROP_MONITOR; | |
1745 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1746 | break; | |
1747 | } | |
39192c0b JB |
1748 | break; |
1749 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1750 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1751 | return RX_DROP_MONITOR; | |
46900298 JB |
1752 | |
1753 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1754 | return RX_DROP_MONITOR; | |
1755 | ||
39192c0b JB |
1756 | switch (mgmt->u.action.u.measurement.action_code) { |
1757 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1758 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1759 | sizeof(mgmt->u.action.u.measurement))) | |
1760 | return RX_DROP_MONITOR; | |
1761 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1762 | break; | |
c481ec97 S |
1763 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1764 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1765 | sizeof(mgmt->u.action.u.chan_switch))) | |
1766 | return RX_DROP_MONITOR; | |
1767 | ||
cc32abd4 JB |
1768 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
1769 | return RX_DROP_MONITOR; | |
1770 | ||
46900298 | 1771 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1772 | return RX_DROP_MONITOR; |
1773 | ||
46900298 | 1774 | bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid, |
c481ec97 | 1775 | local->hw.conf.channel->center_freq, |
46900298 JB |
1776 | sdata->u.mgd.ssid, |
1777 | sdata->u.mgd.ssid_len); | |
c481ec97 S |
1778 | if (!bss) |
1779 | return RX_DROP_MONITOR; | |
1780 | ||
cc32abd4 | 1781 | ieee80211_sta_process_chanswitch(sdata, |
c481ec97 S |
1782 | &mgmt->u.action.u.chan_switch.sw_elem, bss); |
1783 | ieee80211_rx_bss_put(local, bss); | |
1784 | break; | |
39192c0b JB |
1785 | } |
1786 | break; | |
fea14732 JM |
1787 | case WLAN_CATEGORY_SA_QUERY: |
1788 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1789 | sizeof(mgmt->u.action.u.sa_query))) | |
1790 | return RX_DROP_MONITOR; | |
1791 | switch (mgmt->u.action.u.sa_query.action) { | |
1792 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1793 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1794 | return RX_DROP_MONITOR; | |
1795 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1796 | break; | |
1797 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1798 | /* | |
1799 | * SA Query response is currently only used in AP mode | |
1800 | * and it is processed in user space. | |
1801 | */ | |
1802 | return RX_CONTINUE; | |
1803 | } | |
1804 | break; | |
39192c0b JB |
1805 | default: |
1806 | return RX_CONTINUE; | |
de1ede7a JB |
1807 | } |
1808 | ||
39192c0b JB |
1809 | rx->sta->rx_packets++; |
1810 | dev_kfree_skb(rx->skb); | |
1811 | return RX_QUEUED; | |
de1ede7a JB |
1812 | } |
1813 | ||
49461622 | 1814 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1815 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1816 | { |
759ef3eb | 1817 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1818 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1819 | |
5cf121c3 | 1820 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1821 | return RX_DROP_MONITOR; |
571ecf67 | 1822 | |
97ebe12a JM |
1823 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1824 | return RX_DROP_MONITOR; | |
1825 | ||
472dbc45 JB |
1826 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1827 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1828 | ||
3832c287 | 1829 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
7986cf95 | 1830 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status); |
f9d540ee | 1831 | |
7986cf95 | 1832 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
46900298 | 1833 | return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
46900298 | 1834 | |
7986cf95 | 1835 | return RX_DROP_MONITOR; |
571ecf67 JB |
1836 | } |
1837 | ||
571ecf67 JB |
1838 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1839 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1840 | struct ieee80211_rx_data *rx) |
571ecf67 | 1841 | { |
a7767f95 HH |
1842 | int keyidx; |
1843 | unsigned int hdrlen; | |
571ecf67 | 1844 | |
a7767f95 | 1845 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1846 | if (rx->skb->len >= hdrlen + 4) |
1847 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1848 | else | |
1849 | keyidx = -1; | |
1850 | ||
8944b79f | 1851 | if (!rx->sta) { |
aa0daf0e JB |
1852 | /* |
1853 | * Some hardware seem to generate incorrect Michael MIC | |
1854 | * reports; ignore them to avoid triggering countermeasures. | |
1855 | */ | |
571ecf67 JB |
1856 | goto ignore; |
1857 | } | |
1858 | ||
a7767f95 | 1859 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1860 | goto ignore; |
571ecf67 | 1861 | |
05c914fe | 1862 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1863 | /* |
1864 | * APs with pairwise keys should never receive Michael MIC | |
1865 | * errors for non-zero keyidx because these are reserved for | |
1866 | * group keys and only the AP is sending real multicast | |
1867 | * frames in the BSS. | |
1868 | */ | |
eb063c17 | 1869 | goto ignore; |
571ecf67 JB |
1870 | } |
1871 | ||
a7767f95 HH |
1872 | if (!ieee80211_is_data(hdr->frame_control) && |
1873 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1874 | goto ignore; |
571ecf67 | 1875 | |
a3b8b056 | 1876 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL); |
571ecf67 JB |
1877 | ignore: |
1878 | dev_kfree_skb(rx->skb); | |
1879 | rx->skb = NULL; | |
1880 | } | |
1881 | ||
5cf121c3 JB |
1882 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1883 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1884 | { |
1885 | struct ieee80211_sub_if_data *sdata; | |
1886 | struct ieee80211_local *local = rx->local; | |
1887 | struct ieee80211_rtap_hdr { | |
1888 | struct ieee80211_radiotap_header hdr; | |
1889 | u8 flags; | |
1890 | u8 rate; | |
1891 | __le16 chan_freq; | |
1892 | __le16 chan_flags; | |
1893 | } __attribute__ ((packed)) *rthdr; | |
1894 | struct sk_buff *skb = rx->skb, *skb2; | |
1895 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1896 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1897 | |
5cf121c3 | 1898 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1899 | goto out_free_skb; |
1900 | ||
1901 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1902 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1903 | goto out_free_skb; | |
1904 | ||
1905 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1906 | memset(rthdr, 0, sizeof(*rthdr)); | |
1907 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1908 | rthdr->hdr.it_present = | |
1909 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1910 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1911 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1912 | ||
5cf121c3 | 1913 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1914 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1915 | ||
1916 | if (status->band == IEEE80211_BAND_5GHZ) | |
1917 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1918 | IEEE80211_CHAN_5GHZ); | |
1919 | else | |
1920 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1921 | IEEE80211_CHAN_2GHZ); | |
1922 | ||
1923 | skb_set_mac_header(skb, 0); | |
1924 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1925 | skb->pkt_type = PACKET_OTHERHOST; | |
1926 | skb->protocol = htons(ETH_P_802_2); | |
1927 | ||
1928 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1929 | if (!netif_running(sdata->dev)) | |
1930 | continue; | |
1931 | ||
05c914fe | 1932 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1933 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1934 | continue; | |
1935 | ||
1936 | if (prev_dev) { | |
1937 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1938 | if (skb2) { | |
1939 | skb2->dev = prev_dev; | |
1940 | netif_rx(skb2); | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | prev_dev = sdata->dev; | |
1945 | sdata->dev->stats.rx_packets++; | |
1946 | sdata->dev->stats.rx_bytes += skb->len; | |
1947 | } | |
1948 | ||
1949 | if (prev_dev) { | |
1950 | skb->dev = prev_dev; | |
1951 | netif_rx(skb); | |
1952 | skb = NULL; | |
1953 | } else | |
1954 | goto out_free_skb; | |
1955 | ||
5cf121c3 | 1956 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
1957 | return; |
1958 | ||
1959 | out_free_skb: | |
1960 | dev_kfree_skb(skb); | |
1961 | } | |
1962 | ||
571ecf67 | 1963 | |
8944b79f | 1964 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 1965 | struct ieee80211_rx_data *rx, |
8944b79f | 1966 | struct sk_buff *skb) |
58905290 | 1967 | { |
58905290 JB |
1968 | ieee80211_rx_result res = RX_DROP_MONITOR; |
1969 | ||
8944b79f JB |
1970 | rx->skb = skb; |
1971 | rx->sdata = sdata; | |
1972 | rx->dev = sdata->dev; | |
1973 | ||
e32f85f7 LCC |
1974 | #define CALL_RXH(rxh) \ |
1975 | do { \ | |
1976 | res = rxh(rx); \ | |
1977 | if (res != RX_CONTINUE) \ | |
1978 | goto rxh_done; \ | |
1979 | } while (0); | |
49461622 JB |
1980 | |
1981 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
1982 | CALL_RXH(ieee80211_rx_h_check) | |
1983 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 1984 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
1985 | CALL_RXH(ieee80211_rx_h_sta_process) |
1986 | CALL_RXH(ieee80211_rx_h_defragment) | |
1987 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
1988 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
1989 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
1990 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
1991 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 1992 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
1993 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1994 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 1995 | #endif |
49461622 JB |
1996 | CALL_RXH(ieee80211_rx_h_data) |
1997 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 1998 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
1999 | CALL_RXH(ieee80211_rx_h_mgmt) |
2000 | ||
2001 | #undef CALL_RXH | |
2002 | ||
2003 | rxh_done: | |
58905290 JB |
2004 | switch (res) { |
2005 | case RX_DROP_MONITOR: | |
49461622 JB |
2006 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2007 | if (rx->sta) | |
2008 | rx->sta->rx_dropped++; | |
2009 | /* fall through */ | |
2010 | case RX_CONTINUE: | |
3d30d949 MW |
2011 | ieee80211_rx_cooked_monitor(rx); |
2012 | break; | |
58905290 | 2013 | case RX_DROP_UNUSABLE: |
49461622 JB |
2014 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2015 | if (rx->sta) | |
2016 | rx->sta->rx_dropped++; | |
58905290 JB |
2017 | dev_kfree_skb(rx->skb); |
2018 | break; | |
49461622 JB |
2019 | case RX_QUEUED: |
2020 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2021 | break; | |
58905290 JB |
2022 | } |
2023 | } | |
2024 | ||
571ecf67 JB |
2025 | /* main receive path */ |
2026 | ||
23a24def | 2027 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2028 | struct ieee80211_rx_data *rx, |
23a24def JB |
2029 | struct ieee80211_hdr *hdr) |
2030 | { | |
7ab17c45 | 2031 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2032 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2033 | ||
51fb61e7 | 2034 | switch (sdata->vif.type) { |
05c914fe | 2035 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2036 | if (!bssid) |
2037 | return 0; | |
46900298 | 2038 | if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) { |
5cf121c3 | 2039 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2040 | return 0; |
5cf121c3 | 2041 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2042 | } else if (!multicast && |
2043 | compare_ether_addr(sdata->dev->dev_addr, | |
2044 | hdr->addr1) != 0) { | |
4150c572 | 2045 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2046 | return 0; |
5cf121c3 | 2047 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2048 | } |
2049 | break; | |
05c914fe | 2050 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2051 | if (!bssid) |
2052 | return 0; | |
a7767f95 | 2053 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2054 | return 1; |
87291c02 | 2055 | } |
46900298 | 2056 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2057 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2058 | return 0; |
5cf121c3 | 2059 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2060 | } else if (!multicast && |
2061 | compare_ether_addr(sdata->dev->dev_addr, | |
2062 | hdr->addr1) != 0) { | |
4150c572 | 2063 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2064 | return 0; |
5cf121c3 | 2065 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2066 | } else if (!rx->sta) { |
2067 | int rate_idx; | |
2068 | if (rx->status->flag & RX_FLAG_HT) | |
2069 | rate_idx = 0; /* TODO: HT rates */ | |
2070 | else | |
2071 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2072 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2073 | BIT(rate_idx)); |
2074 | } | |
23a24def | 2075 | break; |
05c914fe | 2076 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2077 | if (!multicast && |
2078 | compare_ether_addr(sdata->dev->dev_addr, | |
2079 | hdr->addr1) != 0) { | |
2080 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2081 | return 0; | |
2082 | ||
5cf121c3 | 2083 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2084 | } |
2085 | break; | |
05c914fe JB |
2086 | case NL80211_IFTYPE_AP_VLAN: |
2087 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2088 | if (!bssid) { |
2089 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2090 | hdr->addr1)) | |
2091 | return 0; | |
2092 | } else if (!ieee80211_bssid_match(bssid, | |
2093 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2094 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2095 | return 0; |
5cf121c3 | 2096 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2097 | } |
23a24def | 2098 | break; |
05c914fe | 2099 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2100 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2101 | return 0; |
2102 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2103 | return 0; | |
2104 | break; | |
05c914fe | 2105 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2106 | /* take everything */ |
2107 | break; | |
05c914fe JB |
2108 | case NL80211_IFTYPE_UNSPECIFIED: |
2109 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2110 | /* should never get here */ |
2111 | WARN_ON(1); | |
2112 | break; | |
23a24def JB |
2113 | } |
2114 | ||
2115 | return 1; | |
2116 | } | |
2117 | ||
571ecf67 | 2118 | /* |
6368e4b1 RR |
2119 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2120 | * be called with rcu_read_lock protection. | |
571ecf67 | 2121 | */ |
71ebb4aa RR |
2122 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2123 | struct sk_buff *skb, | |
2124 | struct ieee80211_rx_status *status, | |
8318d78a | 2125 | struct ieee80211_rate *rate) |
571ecf67 JB |
2126 | { |
2127 | struct ieee80211_local *local = hw_to_local(hw); | |
2128 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2129 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2130 | struct ieee80211_rx_data rx; |
6368e4b1 | 2131 | int prepares; |
8e6f0032 JB |
2132 | struct ieee80211_sub_if_data *prev = NULL; |
2133 | struct sk_buff *skb_new; | |
571ecf67 | 2134 | |
358c8d9d | 2135 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2136 | memset(&rx, 0, sizeof(rx)); |
2137 | rx.skb = skb; | |
2138 | rx.local = local; | |
2139 | ||
5cf121c3 | 2140 | rx.status = status; |
5cf121c3 | 2141 | rx.rate = rate; |
72abd81b | 2142 | |
358c8d9d | 2143 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2144 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2145 | |
8944b79f JB |
2146 | rx.sta = sta_info_get(local, hdr->addr2); |
2147 | if (rx.sta) { | |
d0709a65 JB |
2148 | rx.sdata = rx.sta->sdata; |
2149 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2150 | } |
571ecf67 | 2151 | |
571ecf67 | 2152 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2153 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2154 | return; |
571ecf67 JB |
2155 | } |
2156 | ||
c2b13452 | 2157 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2158 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2159 | |
38f3714d | 2160 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2161 | ieee80211_verify_alignment(&rx); |
38f3714d | 2162 | |
571ecf67 JB |
2163 | skb = rx.skb; |
2164 | ||
79010420 | 2165 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2166 | if (!netif_running(sdata->dev)) |
2167 | continue; | |
2168 | ||
05c914fe | 2169 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2170 | continue; |
2171 | ||
5cf121c3 | 2172 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2173 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2174 | |
6368e4b1 | 2175 | if (!prepares) |
23a24def | 2176 | continue; |
8e6f0032 | 2177 | |
340e11f3 JB |
2178 | /* |
2179 | * frame is destined for this interface, but if it's not | |
2180 | * also for the previous one we handle that after the | |
2181 | * loop to avoid copying the SKB once too much | |
2182 | */ | |
2183 | ||
2184 | if (!prev) { | |
2185 | prev = sdata; | |
2186 | continue; | |
8e6f0032 | 2187 | } |
340e11f3 JB |
2188 | |
2189 | /* | |
2190 | * frame was destined for the previous interface | |
2191 | * so invoke RX handlers for it | |
2192 | */ | |
2193 | ||
2194 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2195 | if (!skb_new) { | |
2196 | if (net_ratelimit()) | |
2197 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2198 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2199 | wiphy_name(local->hw.wiphy), |
2200 | prev->dev->name); | |
340e11f3 JB |
2201 | continue; |
2202 | } | |
8944b79f | 2203 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2204 | prev = sdata; |
571ecf67 | 2205 | } |
a4b7d7bd | 2206 | if (prev) |
8944b79f | 2207 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2208 | else |
8e6f0032 | 2209 | dev_kfree_skb(skb); |
571ecf67 | 2210 | } |
6368e4b1 | 2211 | |
b580781e RR |
2212 | #define SEQ_MODULO 0x1000 |
2213 | #define SEQ_MASK 0xfff | |
2214 | ||
2215 | static inline int seq_less(u16 sq1, u16 sq2) | |
2216 | { | |
c6a1fa12 | 2217 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2218 | } |
2219 | ||
2220 | static inline u16 seq_inc(u16 sq) | |
2221 | { | |
c6a1fa12 | 2222 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2223 | } |
2224 | ||
2225 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2226 | { | |
c6a1fa12 | 2227 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2228 | } |
2229 | ||
2230 | ||
2d3babd1 JM |
2231 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
2232 | struct tid_ampdu_rx *tid_agg_rx, | |
2233 | int index) | |
2234 | { | |
2235 | struct ieee80211_supported_band *sband; | |
2236 | struct ieee80211_rate *rate; | |
2237 | struct ieee80211_rx_status status; | |
2238 | ||
2239 | if (!tid_agg_rx->reorder_buf[index]) | |
2240 | goto no_frame; | |
2241 | ||
2242 | /* release the reordered frames to stack */ | |
2243 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, sizeof(status)); | |
2244 | sband = hw->wiphy->bands[status.band]; | |
2245 | if (status.flag & RX_FLAG_HT) | |
2246 | rate = sband->bitrates; /* TODO: HT rates */ | |
2247 | else | |
2248 | rate = &sband->bitrates[status.rate_idx]; | |
2249 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], | |
2250 | &status, rate); | |
2251 | tid_agg_rx->stored_mpdu_num--; | |
2252 | tid_agg_rx->reorder_buf[index] = NULL; | |
2253 | ||
2254 | no_frame: | |
2255 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2256 | } | |
2257 | ||
2258 | ||
4d050f1d JM |
2259 | /* |
2260 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If | |
2261 | * the skb was added to the buffer longer than this time ago, the earlier | |
2262 | * frames that have not yet been received are assumed to be lost and the skb | |
2263 | * can be released for processing. This may also release other skb's from the | |
2264 | * reorder buffer if there are no additional gaps between the frames. | |
2265 | */ | |
2266 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) | |
2267 | ||
71364716 RR |
2268 | /* |
2269 | * As it function blongs to Rx path it must be called with | |
2270 | * the proper rcu_read_lock protection for its flow. | |
2271 | */ | |
c6a1fa12 JB |
2272 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2273 | struct tid_ampdu_rx *tid_agg_rx, | |
2274 | struct sk_buff *skb, | |
b3631286 | 2275 | struct ieee80211_rx_status *rxstatus, |
c6a1fa12 JB |
2276 | u16 mpdu_seq_num, |
2277 | int bar_req) | |
b580781e | 2278 | { |
b580781e RR |
2279 | u16 head_seq_num, buf_size; |
2280 | int index; | |
b580781e RR |
2281 | |
2282 | buf_size = tid_agg_rx->buf_size; | |
2283 | head_seq_num = tid_agg_rx->head_seq_num; | |
2284 | ||
2285 | /* frame with out of date sequence number */ | |
2286 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2287 | dev_kfree_skb(skb); | |
2288 | return 1; | |
2289 | } | |
2290 | ||
2291 | /* if frame sequence number exceeds our buffering window size or | |
2292 | * block Ack Request arrived - release stored frames */ | |
2293 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2294 | /* new head to the ordering buffer */ | |
2295 | if (bar_req) | |
2296 | head_seq_num = mpdu_seq_num; | |
2297 | else | |
2298 | head_seq_num = | |
2299 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2300 | /* release stored frames up to new head to stack */ | |
2301 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2302 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2303 | tid_agg_rx->ssn) | |
2304 | % tid_agg_rx->buf_size; | |
2d3babd1 JM |
2305 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
2306 | index); | |
b580781e RR |
2307 | } |
2308 | if (bar_req) | |
2309 | return 1; | |
2310 | } | |
2311 | ||
2312 | /* now the new frame is always in the range of the reordering */ | |
2313 | /* buffer window */ | |
2314 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2315 | % tid_agg_rx->buf_size; | |
2316 | /* check if we already stored this frame */ | |
2317 | if (tid_agg_rx->reorder_buf[index]) { | |
2318 | dev_kfree_skb(skb); | |
2319 | return 1; | |
2320 | } | |
2321 | ||
2322 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2323 | /* release it immediately */ | |
2324 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2325 | tid_agg_rx->stored_mpdu_num == 0) { | |
2326 | tid_agg_rx->head_seq_num = | |
2327 | seq_inc(tid_agg_rx->head_seq_num); | |
2328 | return 0; | |
2329 | } | |
2330 | ||
2331 | /* put the frame in the reordering buffer */ | |
2332 | tid_agg_rx->reorder_buf[index] = skb; | |
4d050f1d | 2333 | tid_agg_rx->reorder_time[index] = jiffies; |
b3631286 VT |
2334 | memcpy(tid_agg_rx->reorder_buf[index]->cb, rxstatus, |
2335 | sizeof(*rxstatus)); | |
b580781e RR |
2336 | tid_agg_rx->stored_mpdu_num++; |
2337 | /* release the buffer until next missing frame */ | |
2338 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2339 | % tid_agg_rx->buf_size; | |
4d050f1d JM |
2340 | if (!tid_agg_rx->reorder_buf[index] && |
2341 | tid_agg_rx->stored_mpdu_num > 1) { | |
2342 | /* | |
2343 | * No buffers ready to be released, but check whether any | |
2344 | * frames in the reorder buffer have timed out. | |
2345 | */ | |
2346 | int j; | |
2347 | int skipped = 1; | |
2348 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; | |
2349 | j = (j + 1) % tid_agg_rx->buf_size) { | |
2350 | if (tid_agg_rx->reorder_buf[j] == NULL) { | |
2351 | skipped++; | |
2352 | continue; | |
2353 | } | |
2354 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + | |
2355 | HZ / 10)) | |
2356 | break; | |
2357 | ||
2358 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
2359 | if (net_ratelimit()) | |
2360 | printk(KERN_DEBUG "%s: release an RX reorder " | |
2361 | "frame due to timeout on earlier " | |
2362 | "frames\n", | |
2363 | wiphy_name(hw->wiphy)); | |
2364 | #endif | |
2365 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); | |
2366 | ||
2367 | /* | |
2368 | * Increment the head seq# also for the skipped slots. | |
2369 | */ | |
2370 | tid_agg_rx->head_seq_num = | |
2371 | (tid_agg_rx->head_seq_num + skipped) & | |
2372 | SEQ_MASK; | |
2373 | skipped = 0; | |
2374 | } | |
2375 | } else while (tid_agg_rx->reorder_buf[index]) { | |
2d3babd1 | 2376 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
b580781e RR |
2377 | index = seq_sub(tid_agg_rx->head_seq_num, |
2378 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2379 | } | |
2380 | return 1; | |
2381 | } | |
2382 | ||
71ebb4aa | 2383 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
b3631286 VT |
2384 | struct sk_buff *skb, |
2385 | struct ieee80211_rx_status *status) | |
b580781e RR |
2386 | { |
2387 | struct ieee80211_hw *hw = &local->hw; | |
2388 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2389 | struct sta_info *sta; | |
2390 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2391 | u16 sc; |
b580781e | 2392 | u16 mpdu_seq_num; |
182503ab | 2393 | u8 ret = 0; |
b580781e RR |
2394 | int tid; |
2395 | ||
2396 | sta = sta_info_get(local, hdr->addr2); | |
2397 | if (!sta) | |
2398 | return ret; | |
2399 | ||
b580781e RR |
2400 | /* filter the QoS data rx stream according to |
2401 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2402 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2403 | goto end_reorder; |
2404 | ||
238f74a2 | 2405 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2406 | |
cee24a3e | 2407 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2408 | goto end_reorder; |
2409 | ||
cee24a3e RR |
2410 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2411 | ||
2560b6e2 EG |
2412 | /* qos null data frames are excluded */ |
2413 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2414 | goto end_reorder; |
2415 | ||
2416 | /* new un-ordered ampdu frame - process it */ | |
2417 | ||
2418 | /* reset session timer */ | |
20ad19d0 JB |
2419 | if (tid_agg_rx->timeout) |
2420 | mod_timer(&tid_agg_rx->session_timer, | |
2421 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2422 | |
2423 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2424 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2425 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2426 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2427 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2428 | ret = 1; | |
2429 | goto end_reorder; | |
2430 | } | |
2431 | ||
2432 | /* according to mpdu sequence number deal with reordering buffer */ | |
2433 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
b3631286 | 2434 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, status, |
b580781e | 2435 | mpdu_seq_num, 0); |
d0709a65 | 2436 | end_reorder: |
b580781e RR |
2437 | return ret; |
2438 | } | |
2439 | ||
6368e4b1 RR |
2440 | /* |
2441 | * This is the receive path handler. It is called by a low level driver when an | |
2442 | * 802.11 MPDU is received from the hardware. | |
2443 | */ | |
2444 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2445 | struct ieee80211_rx_status *status) | |
2446 | { | |
2447 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2448 | struct ieee80211_rate *rate = NULL; |
2449 | struct ieee80211_supported_band *sband; | |
2450 | ||
2451 | if (status->band < 0 || | |
13d8fd2d | 2452 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2453 | WARN_ON(1); |
2454 | return; | |
2455 | } | |
2456 | ||
2457 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2458 | if (!sband) { |
8318d78a JB |
2459 | WARN_ON(1); |
2460 | return; | |
2461 | } | |
2462 | ||
0fb8ca45 JM |
2463 | if (status->flag & RX_FLAG_HT) { |
2464 | /* rate_idx is MCS index */ | |
2465 | if (WARN_ON(status->rate_idx < 0 || | |
2466 | status->rate_idx >= 76)) | |
2467 | return; | |
2468 | /* HT rates are not in the table - use the highest legacy rate | |
2469 | * for now since other parts of mac80211 may not yet be fully | |
2470 | * MCS aware. */ | |
2471 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2472 | } else { | |
2473 | if (WARN_ON(status->rate_idx < 0 || | |
2474 | status->rate_idx >= sband->n_bitrates)) | |
2475 | return; | |
2476 | rate = &sband->bitrates[status->rate_idx]; | |
2477 | } | |
6368e4b1 RR |
2478 | |
2479 | /* | |
2480 | * key references and virtual interfaces are protected using RCU | |
2481 | * and this requires that we are in a read-side RCU section during | |
2482 | * receive processing | |
2483 | */ | |
2484 | rcu_read_lock(); | |
2485 | ||
2486 | /* | |
2487 | * Frames with failed FCS/PLCP checksum are not returned, | |
2488 | * all other frames are returned without radiotap header | |
2489 | * if it was previously present. | |
2490 | * Also, frames with less than 16 bytes are dropped. | |
2491 | */ | |
8318d78a | 2492 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2493 | if (!skb) { |
2494 | rcu_read_unlock(); | |
2495 | return; | |
2496 | } | |
2497 | ||
aec67952 JM |
2498 | /* |
2499 | * In theory, the block ack reordering should happen after duplicate | |
2500 | * removal (ieee80211_rx_h_check(), which is an RX handler). As such, | |
2501 | * the call to ieee80211_rx_reorder_ampdu() should really be moved to | |
2502 | * happen as a new RX handler between ieee80211_rx_h_check and | |
2503 | * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for | |
2504 | * the time being, the call can be here since RX reorder buf processing | |
2505 | * will implicitly skip duplicates. We could, in theory at least, | |
2506 | * process frames that ieee80211_rx_h_passive_scan would drop (e.g., | |
2507 | * frames from other than operational channel), but that should not | |
2508 | * happen in normal networks. | |
2509 | */ | |
b3631286 | 2510 | if (!ieee80211_rx_reorder_ampdu(local, skb, status)) |
9e72ebd6 | 2511 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2512 | |
2513 | rcu_read_unlock(); | |
2514 | } | |
571ecf67 JB |
2515 | EXPORT_SYMBOL(__ieee80211_rx); |
2516 | ||
2517 | /* This is a version of the rx handler that can be called from hard irq | |
2518 | * context. Post the skb on the queue and schedule the tasklet */ | |
2519 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2520 | struct ieee80211_rx_status *status) | |
2521 | { | |
2522 | struct ieee80211_local *local = hw_to_local(hw); | |
2523 | ||
2524 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2525 | ||
2526 | skb->dev = local->mdev; | |
2527 | /* copy status into skb->cb for use by tasklet */ | |
2528 | memcpy(skb->cb, status, sizeof(*status)); | |
2529 | skb->pkt_type = IEEE80211_RX_MSG; | |
2530 | skb_queue_tail(&local->skb_queue, skb); | |
2531 | tasklet_schedule(&local->tasklet); | |
2532 | } | |
2533 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |